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Note: This page contains sample records for the topic "ti ia al" from the National Library of EnergyBeta (NLEBeta).
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1

NJ WY AK AL CA AR CO CT DE FL GA HI ID KS IL IN IA IA KY LA  

Gasoline and Diesel Fuel Update (EIA)

176, "Annual Report of Natural and Supplemental Gas Supply and Disposition." NJ WY AK AL CA AR CO CT DE FL GA HI ID KS IL IN IA IA KY LA ME MI MA MD MN MS MT MO NE ND OH NV NM NY...

2

Gamma TiAl Alloys 2014  

Science Conference Proceedings (OSTI)

Jul 15, 2013... for selective laser melting – from single track to fully dense specimens ... Rolling and Grinding of Thin Sheets of Beta-Solidified Gamma TiAl ...

3

NJ WY AK AL CA AR CO CT DE FL GA HI ID KS IL IN IA IA KY LA  

Gasoline and Diesel Fuel Update (EIA)

0.00-1.99 0.00-1.99 2.00-2.99 3.00-3.99 4.00-4.99 5.00-5.99 6.00-6.99 7.00+ NJ WY AK AL CA AR CO CT DE FL GA HI ID KS IL IN IA IA KY LA ME MI MA MD MN MS MT MO NE ND OH NV NM NY NH NC OK OR PA RI SC SD TN TX UT VT WA WV WI AZ VA DC 0.00-1.99 2.00-2.99 3.00-3.99 4.00-4.99 5.00-5.99 6.00-6.99 7.00+ 18. Average Price of Natural Gas Delivered to U.S. Onsystem Industrial Consumers, 1996 (Dollars per Thousand Cubic Feet) Figure 19. Average Price of Natural Gas Delivered to U.S. Electric Utilities, 1996 (Dollars per Thousand Cubic Feet) Figure Sources: Federal Energy Regulatory Commission (FERC), Form FERC-423, "Monthly Report of Cost and Quality of Fuels for Electric Plants," and Energy Information Administration (EIA), Form EIA-176, "Annual Report of Natural and Supplemental Gas Supply and Disposition." Note: In 1996, consumption of natural gas for agricultural use

4

Emerging Robust Beta Gamma TiAl Alloys  

Science Conference Proceedings (OSTI)

Recently a new class of TiAl based alloy system, called beta gamma, that ... Phase-Field Simulation on Phase Transformation during Creep Deformation in Type ...

5

Composite Ti-6Al-4V + Hydroxyapatite Biomedical Implant Materials ...  

Science Conference Proceedings (OSTI)

Together the augmented diffusion mode and accelerated application of thermal energy allow co-sintering of Ti-6Al-4V + HA below 1000°C to be realized, thus ...

6

Compton Profile Study of Intermetallic Ti{sub 3}Al  

SciTech Connect

The Compton scattering measurement on intermetallic alloy Ti{sub 3}Al is reported in this work. The measurement is made using 59.54 keV gamma-rays from Am{sup 241} source. Theoretical calculation of Compton profile is also performed employing CRYSTAL code within the framework of density functional theory to compare with the measurement. The theoretical profile of the alloy is also synthesized following the superposition model taking the published Compton profiles of elemental solids from the APW method. The experimental study of charge transfer in the alloys has also been done by performing the experimental Compton profile measurements on Ti and Al following the superposition model and charge transfer from Al to Ti is clearly seen on the alloy formation.

Vyas, V.; Sharma, G. [Department of Physics, Banasthali University, Banasthali-304022 (India); Mishra, M. C.; Sharma, B. K. [Department of Physics, University of Rajasthan, Jaipur-302004 (India); Joshi, K. B. [Department of Physics, University College of Science, M.L.Sukhadia University, Udaipur-313 002 (India)

2011-10-20T23:59:59.000Z

7

Friction Stir Processing of Ti-6Al-4V for Grain Size Reduction in ...  

Science Conference Proceedings (OSTI)

In Ti alloys, such as Ti-6Al-4V, fusion welding results in coarse-grained microstructure ... Friction Stir Spot Welding of Magnesium to Aluminum Alloys with a Cold ...

8

Grain Refinement in TiC-Ni3Al Composites  

DOE Green Energy (OSTI)

The Cooperative Research and Development Agreement (CRADA) was to develop composites of TiC-Ni{sub 3}Al with refined grain microstructures for application in diesel engine fuel injection devices. Grain refinement is important for improved wear resistance and high strength for the applications of interest. Attrition milling effectively reduces the initial particle size and leads to a reduction of the final grain size. However, an increase in the oxygen content occurs concomitantly with the grinding operation and decreased densification of the compacts occurs during sintering.

Tiegs, T.N.

2001-01-30T23:59:59.000Z

9

Effects of the Ti/Al atomic ratio on the properties of gradient (Ti,Al)N films synthesized by ion beam assisted deposition  

SciTech Connect

Gradient (Ti,Al)N films were prepared on high speed steel (HSS) and Si (111) wafers by using two Ar{sup +} beams to sputter a titanium target and an aluminum target separately, and a third N{sup +} beam to simultaneously bombard the growing film to assist deposition. The effects of the Ti/Al atomic ratio in the films on properties such as hardness, stress, and adhesion strength were investigated systematically. The results indicated that both the hardness and the adhesion of gradient (Ti,Al)N films to steel substrates exhibited {open_quotes}peak{close_quotes} type changes with an increase of the Ti/Al atomic ratio, and a maximum hardness of 3780thinspkgfthinspmm{sup {minus}2} was reached at a Ti/Al ratio of 5.35. The compressive stress of gradient (Ti,Al)N films increased with increasing Al content in the films. It was found that extreme hardness, high adhesion strength and low stress gradient (Ti,Al)N films can be synthesized on low temperature HSS steel by using the ion beam assisted deposition process.

He, X.; Shu, L.; Xie, Z.W. [Materials Science and Technology Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (United States)

1999-03-01T23:59:59.000Z

10

27Al and 1H Solid State NMR Studies Show Evidence of TiAl3 and TiH2 in Ti-doped NaAlH4  

DOE Green Energy (OSTI)

Previous X-ray Diffraction (XRD) and Nuclear Magnetic Resonance (NMR) studies on Ti-doped NaAlH{sub 4} revealed the reaction products of two heavily doped (33.3 at.%) samples that were solvent-mixed and mechanically-milled. This investigation revealed that nano-crystalline or amorphous Al{sub 2}O{sub 3} forms from the possible coordination of aluminum with oxygen atom of the furan ring system from added tetrahydrofuran (THF) in the solvent-mixed sample, and that TiAl{sub 3} forms in mechanically-milled samples. The present paper provides a more sophisticated NMR investigation of the these materials. On heavily doped (33.3 at.%) solvent-mixed samples, {sup 27}Al Magic Angle Spinning (MAS) NMR {sup 27}Al multiple quantum MAS (MQMAS) indicates the presence of an oxide layer of Al{sub 2}O{sub 3} on the surfaces of potentially bulk nanocrystalline Ti, nanocrystalline TiAl{sub 3}, and/or metallic aluminum. The {sup 1}H MAS NMR data also indicate the possible coordination of aluminum with the oxygen atom in the THF. On heavily doped samples that were mechanically milled, {sup 27}Al MAS NMR and static NMR confirms the presence of TiAl{sub 3}. In addition, the {sup 1}H MAS NMR and {sup 1}H spin-lattice relaxation (T{sub 1}) measurements are consistent with the presence of TiH{sub 2}. These results are in agreement with recent XAFS measurements indicating both Al and H within the first few coordination shells of Ti in the doped alanate.

Herberg, J; Maxwell, R; Majzoub, E

2005-05-26T23:59:59.000Z

11

Microscopic Study on the Interface Reaction between Ti and Al-Zn ...  

Science Conference Proceedings (OSTI)

Presentation Title, Microscopic Study on the Interface Reaction between Ti and Al -Zn Alloy during Ultra-Fast Heat Treatment. Author(s), Yue Zhao, David Nolan, ...

12

Nano-laminated Ti3Al Porous Structure Produced by Hot Forging ...  

Science Conference Proceedings (OSTI)

Extending Bulk CALPHAD Methods to Interfaces and Nanomaterials to Help ... Ti3Al Porous Structure Produced by Hot Forging and Selective Dissolution.

13

the effect of nb, ti, al on precipitation and strengthening behavior of ...  

Science Conference Proceedings (OSTI)

high temperature industries. However, the ceiling temperature for Alloy 718 is 650 because of. ? the instability of main strengthening phase ??-Ni3(Nb,Ti,Al).

14

Investigation of Ti-doped NaAlH4 by solid-state NMR  

DOE Green Energy (OSTI)

In recent years, the development of Ti-doped NaAlH{sub 4} as a hydrogen storage material has gained attention because of its large weight percentage of hydrogen ({approx}5%) compared to traditional interstitial hydrides. The addition of transition-metal dopants, in the form of Ti-halides, such as TiCl{sub 3}, dramatically improves the kinetics of the absorption and desorption of hydrogen from NaAlH{sub 4}. However, the role that Ti plays in enhancing the absorption and desorption of H{sub 2} is still unknown. In the present study, {sup 27}Al, {sup 23}Na, and {sup 1}H MAS (Magic Angle Spinning) NMR (Nuclear Magnetic Resonance) has been performed to understand the titanium speciation in Ti-doped NaAlH{sub 4}. All experiments were performed on a sample of crushed single crystals exposed to Ti during growth, a sample of solvent-mixed 4TiCl{sub 3} + 112NaAlH{sub 4}, a reacted sample of solvent-mixed TiCl{sub 3} + {sup 3}NaAlH{sub 4} with THF, and a reacted sample of ball-milled TiCl3 + 3NaAlH{sub 4}. The {sup 27}Al MAS NMR has shown differences in compound formation between solvent-mixed TiCl{sub 3} + 3NaAlH{sub 4} with THF and the mechanically ball-milled TiCl{sub 3} + 3NaAlH{sub 4}. {sup 27}Al MAS NMR of the mechanically ball-milled mixture of fully-reacted TiCl{sub 3} + 3NaAlH{sub 4} showed spectral signatures of TiAl{sub 3} while, the solvent-mixed 4TiCl{sub 3} + 112NaAlH{sub 4}, which is totally reacted, does not show the presences of TiAl{sub 3}, but shows the existence of Al{sub 2}O{sub 3}.

Maxwell, R; Majzoub, E; Herberg, J

2003-11-24T23:59:59.000Z

15

Phase Transformation and Equilibrium Diagram of Ti-Al-Nb Ternary ...  

Science Conference Proceedings (OSTI)

The phase type and distribution range of Ti-Al-Nb ternary alloy, as well as calculated phase diagram, were directly obtained by TC calculation, as a instruction of ...

16

Reactivity of Ti2AlC with SiC Fibers and Powders up to ...  

Science Conference Proceedings (OSTI)

Herein we investigated the reactivity of Ti2AlC [3ONE2] with SiC fibers [Avco Specialty Materials and Nippon Carbon Co.] and fine SiC powders [Superior ...

17

Improving Stress Rupture Life of Alloy 718 by Optimizing Al, Ti ... - TMS  

Science Conference Proceedings (OSTI)

IhlPRO\\.'IIVG STRESS RUPTURE LIFE OF ALLOY 718 BY. OPTIXllZING AL, TI, P AND B CONTENTS. W. D. Cao and R. L. Kennedy. ,All\\ ac. An Allegheny ...

18

Interfaces in Ti[sub 3]Al composites reinforced with sigma SiC fibres  

Science Conference Proceedings (OSTI)

When SCS-6 fibers are used for reinforcing Ti[sub 3]Al matrices, a [beta]-depleted zone is often found in the matrix adjacent to the interface, varying from 3 to 7 [mu]m in thickness depending on the composition of the matrix. The cause for such depletion is believed to be the migration of the [beta] stabilizer, Nb, from the adjacent matrix into the reaction zone, which forms Nb-containing compounds such as (Ti,Nb)C and (Ti,Nb)[sub 5]Si[sub 3]. The depletion of [beta] near the interface can enhance the propensity for interfacial cracking as the more brittle [alpha][sub 2] phase is enriched. Here, the authors present a study of the interfaces in a Ti[sub 3]Al/SiC Sigma fiber composite. The reaction products, changes in microstructure and reaction kinetics are compared with Ti-6Al-4V matrix containing Sigma fibers and Ti[sub 3]Al matrices containing SCS fibers.

Guo, Z.X.; Derby, B. (Univ. of Oxford (United Kingdom). Dept. of Materials)

1994-01-01T23:59:59.000Z

19

Catalytic Effect of Ti for Hydrogen Cycling in NaAlH4  

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

Effect of Ti for Effect of Ti for Hydrogen Cycling in NaAlH 4 Mei-Yin Chou School of Physics Georgia Institute of Technology (DE-FG02-05ER46229) Acknowledgment: Yan Wang, Roland Stumpf Why is NaAlH 4 interesting? A viable candidate for hydrogen-storage material: High theoretical weight-percent hydrogen content of 5.55% and low cost But (before 1997) Dehydrogenation occurs at high temperature; rehydrogenation is difficult. Bogdanovic and Schwickardi, 1997 Hydrogen can be reversibly absorbed and desorbed from NaAlH 4 under moderate conditions by the addition of catalysts (compounds containing Ti, Zr, etc.) High Hydrogen Contents in Complex Hydrides Hydride wt% Hydride wt% Be(BH 4 ) 2 20.8 Mg(AlH 4 ) 2 9.3 LiBH 4 18.2 Ca(AlH 4 ) 2 7.9 Mg(BH 4 ) 2 14.9 KBH 4 7.5 Ca(BH 4 ) 2 11.6 NaAlH 4 7.5 NaBH4 10.7 Ga(AlH

20

Variant Selection during Alpha Precipitation in Ti-6Al-4V under the ...  

Science Conference Proceedings (OSTI)

... to available thermodynamic and mobility databases, but also incorporating the ... Characterizing and Exploring the Broad Utility of Kinetic Metallization, ... Effect of Heating Rate on the Short Time Aging Kinetics of Ti-6.8Mo-4.5Fe-1.5Al.

Note: This page contains sample records for the topic "ti ia al" 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

Melt Processing of Al-TiB2 Nanocomposite Materials  

Science Conference Proceedings (OSTI)

Symposium, J. Materials and Processes for Enhanced Performance ... Separation and Recovery Process of Rare Metals from Oil Desulfurization Spent Catalyst ... Pulsed Laser Evaporation: An Enabling Technology for Organic Thin Films ... Redox Investigation of NiFe2O4 Supported on Al2O3 and Yttria-Stabilized Zirconia ...

22

Lattice variations of Ti-6Al-4V alloy with hydrogen content  

Science Conference Proceedings (OSTI)

Effect of hydrogen content on the lattice parameter of Ti-6Al-4V alloy has been investigated by X-ray diffraction. The experimental results show that the solution of hydrogen in the Ti-6Al-4V alloy affects significantly on the lattice parameters of {alpha}, {beta} and {delta} phases, especially the {beta} phase. Furthermore, the critical hydrogen content of {delta} hydride formation for Ti-6Al-4V alloy is 0.385 wt.%. When the hydrogen content is lower than the critical hydrogen content, the {delta} hydride cannot precipitate and the lattice parameter ({alpha}) of {beta} phase linearly increases with the increasing of hydrogen content. When the hydrogen content is higher than the critical hydrogen content, the {delta} hydride precipitates and the lattice parameter ({alpha}) of {beta} phase varies inconspicuously with hydrogen content. In addition, the effects of lattice variations and {delta} hydride formation on microstructure are discussed. The {alpha}/{beta} interfaces of lamellar transformed {beta} phase become fuzzy with the increasing of hydrogen content because of the lattice expansion of {beta} phase. Compared with that of the Ti-6Al-4V alloy at low hydrogen content ({=} 0.385 wt.%) were completely reversed due to the formation of {delta} hydride. - Research Highlights: {yields} A novel method for determining {delta} hydride in Ti-6Al-4V alloy is presented. {yields} The critical hydrogen content of {delta} hydride formation is 0.385 wt.%. {yields} The lattice parameter of {beta} phase can be expressed as follows: a=0.323(1+9.9x10{sup -2}C{sub H}) . {yields} Precipitation of {delta} hydride has a significant influence on the microstructure. {yields} The {alpha}/{beta} interfaces of transformed {beta} phase became fuzzy in the hydrogenated alloy.

Zhu Tangkui, E-mail: zhutangkui@sohu.com; Li, Miaoquan, E-mail: honeymli@nwpu.edu.cn

2011-07-15T23:59:59.000Z

23

Properties of ion implanted Ti-6Al-4V processed using beamline and PSII techniques  

DOE Green Energy (OSTI)

The surface of Ti-6Al-4V (Ti64) alloy has been modified using beamline implantation of boron. In separate experiments, Ti64 has been implanted with nitrogen using a plasma source ion implantation (PSII) technique utilizing either ammonia (NH{sub 3}), nitrogen (N{sub 2}), or their combinations as the source of nitrogen ions. Beamline experiments have shown the hardness of the N-implanted surface saturates at a dose level of {approximately} 4 {times} 10{sup 17} at/cm{sup 2} at {approximately} 10 GPa. The present work makes comparisons of hardness and tribological tests of (1) B implantation using beamline techniques, and (2) N implanted samples using ammonia and/or nitrogen gas in a PSII process. The results show that PSII using N{sub 2} or NH{sub 3} gives similar hardness as N implantation using a beamline process. The presence of H in the Ti alloy surface does not affect the hardness of the implanted surface. Boron implantation increased the surface hardness by as much as 2.5x at the highest dose level. Wear testing by a pin-on-disk method indicated that nitrogen implantation reduced the wear rate by as much as 120x, and boron implantation reduced the wear rate by 6.5x. Increased wear resistance was accompanied by a decreased coefficient of friction.

Walter, K.C.; Woodring, J.S.; Nastasi, M.; Munson, C.M. [Los Alamos National Lab., NM (United States); Williams, J.M.; Poker, D.B. [Oak Ridge National Lab., TN (United States). Solid State Div.

1996-12-31T23:59:59.000Z

24

Switchable Induced Polarization in LaAlO3/SrTiO3 Heterostructures  

SciTech Connect

Demonstration of a tunable conductivity of the LaAlO3/SrTiO3 interfaces drew significant attention to the development of oxide electronic structures where electronic confinement can be reduced to the nanometer range. While the mechanisms for the conductivity modulation are quite different and include metal insulator phase transition and surface charge writing, generally it is implied that this effect is a result of electrical modification of the LaAlO3 surface (either due to electrochemical dissociation of surface adsorbates or free charge deposition) leading to the change in the twodimensional electron gas (2DEG) density at the LaAlO3/SrTiO3 (LAO/STO) interface. In this paper, using piezoresponse force microscopy we demonstrate a switchable electromechanical response of the LAO overlayer, which we attribute to the motion of oxygen vacancies through the LAO layer thickness. These electrically induced reversible changes in bulk stoichiometry of the LAO layer are a signature of a possible additional mechanism for nanoscale oxide 2DEG control on LAO/STO interfaces.

Bark, C [University of Wisconsin, Madison; Sharma, P. [University of Nebraska; Wang, Y. [University of Nebraska; Baek, Seung Hyub [University of Wisconsin, Madison; Lee, S. [University of Wisconsin, Madison; Ryu, S. [University of Wisconsin, Madison; Folkman, C H [University of Wisconsin; Paudel, Tula R [ORNL; Kumar, Amit [ORNL; Kalinin, Sergei V [ORNL; Sokolov, A. [University of Nebraska; Tsymbal, E Y [University of Nebraska, Lincoln; Rzchowski, M [University of Wisconsin; Gruverman, Alexei [ORNL; Eom, Professor Chang-Beom [University of Wisconsin, Madison

2012-01-01T23:59:59.000Z

25

High-Temperature Galling Characteristics of Ti-6Al-4V with and without Surface Treatments  

SciTech Connect

Galling is a severe form of surface damage in metals and alloys that typically arises under relatively high normal force, low-sliding speed, and in the absence of effective lubrication. It can lead to macroscopic surface roughening and seizure. The occurrence of galling can be especially problematic in high-temperature applications like diesel engine exhaust gas recirculation system components and adjustable turbocharger vanes, because suitable lubricants may not be available, moisture desorption promotes increased adhesion, and the yield strength of metals decreases with temperature. Oxidation can counteract these effects to some extent by forming lubricative oxide films. Two methods to improve the galling resistance of titanium alloy Ti-6Al-4V were investigated: (a) applying an oxygen diffusion treatment, and (b) creating a metal-matrix composite with TiB2 using a high-intensity infrared heating source. A new, oscillating three-pin-on-flat, high-temperature test method was developed and used to characterize galling behavior relative to a cobalt-based alloy (Stellite 6B ). The magnitude of the oscillating torque, the surface roughness, and observations of surface damage were used as measures of galling resistance. Owing to the formation of lubricative oxide films, the galling resistance of the Ti-alloy at 485o C, even non-treated, was considerably better than it was at room temperature. The IR-formed composite displayed reduced surface damage and lower torque than the substrate titanium alloy.

Blau, Peter Julian [ORNL; ERDMAN III, DONALD L [ORNL; Ohriner, Evan Keith [ORNL; Jolly, Brian C [ORNL

2011-01-01T23:59:59.000Z

26

Dynamic fracture behavior of Ti-6Al-4V alloy with various stabilities of [beta] phase  

Science Conference Proceedings (OSTI)

The effect of stability of the body-centered cubic (bcc) [beta] phase on the dynamic fracture behavior of Ti-6Al-4V alloy at room temperature and 77 K has been studied. The presence of a highly unstable [beta] phase in the quenched alloy leads to a decrease in both the dynamic fracture toughness and the crack propagation energy, and this decrease becomes more pronounced when test temperature is reduced to 77 K. Somewhat improved fracture characteristics were obtained by applying anneal procedure to receive a fully stable [beta] phase. The highest fracture toughness as well as the greatest crack propagation resistance were observed in the air-cooled grade, where the lattice parameter of the bcc phase was intermediate between those pertaining to quenched and annealed Ti-6Al-4V alloys. The effect is attributed to the vanadium content in the [beta] phase, which is sufficiently high to suppress deformation-induced transformation. On the other hand, the V content should be low enough to retard ductile-brittle transition, typical for the bcc metals at cryogenic temperatures. As a result, marked toughening can be achieved, so that the lowest application temperature of high-strength titanium alloys containing the bcc phase can be decreased significantly.

Akmoulin, I.A.; Niinomi, M.; Kobayashi, T. (Toyohashi Univ. of Technology (Japan). Dept. of Production Systems Engineering)

1994-08-01T23:59:59.000Z

27

Microstructures and mechanical properties of electron beam-rapid manufactured Ti-6Al-4V biomedical prototypes compared to wrought Ti-6Al-4V  

Science Conference Proceedings (OSTI)

This study represents an exploratory characterization and comparison of electron-beam melted (EBM) or rapid manufacturing (RM) of Ti-6Al-4V components (from nominal 30 {mu}m diameter powder) with wrought products. Acicular {alpha} and associated {beta} microstructures observed by optical metallography and electron microscopy (SEM and TEM) are compared along with corresponding tensile test and hardness data; including the initial powder particles where the Vickers microindentation hardness averaged 5.0 GPa in comparison with the fully dense, EB manufactured product with an average microindentation hardness ranging from 3.6 to 3.9 GPa. This compared with wrought products where the Vickers microindentation hardness averaged 4.0 GPa. Values of UTS for the EBM samples averaged 1.18 GPa for elongations ranging from 16 to 25%. Biomaterials/biomedical applications of EBM prototypes in direct prosthesis or implant manufacturing from CT or MRI data are discussed in the context of this work, especially prospects for tailoring physical properties through EB control to achieve customized and optimized implant and prosthetic products direct from CT-scans.

Murr, L.E. [Department of Metallurgical and Materials Engineering, University of Texas at El Paso, El Paso, TX 79968 (United States)], E-mail: fekberg@utep.edu; Esquivel, E.V. [Department of Metallurgical and Materials Engineering, University of Texas at El Paso, El Paso, TX 79968 (United States); Quinones, S.A. [Department of Electrical and Computer Engineering and Keck Center for 3-D Innovation, University of Texas at El Paso, El Paso, TX 79968 (United States); Gaytan, S.M.; Lopez, M.I.; Martinez, E.Y. [Department of Metallurgical and Materials Engineering, University of Texas at El Paso, El Paso, TX 79968 (United States); Medina, F. [Department of Mechanical Engineering and Keck Center for 3-D Innovation, University of Texas at El Paso, El Paso, TX 79968 (United States); Hernandez, D.H.; Martinez, E.; Martinez, J.L.; Stafford, S.W.; Brown, D.K. [Department of Metallurgical and Materials Engineering, University of Texas at El Paso, El Paso, TX 79968 (United States); Hoppe, T.; Meyers, W. [Stratasys, Eden Prairie, MN 55344 (United States); Lindhe, U. [Arcam AB, Moelndal (Sweden); Wicker, R.B. [Department of Mechanical Engineering and Keck Center for 3-D Innovation, University of Texas at El Paso, El Paso, TX 79968 (United States)

2009-02-15T23:59:59.000Z

28

Microstructural characterization and mechanical property of active soldering anodized 6061 Al alloy using Sn-3.5Ag-xTi active solders  

SciTech Connect

Active solders Sn-3.5Ag-xTi varied from x = 0 to 6 wt.% Ti addition were prepared by vacuum arc re-melting and the resultant phase formation and variation of microstructure with titanium concentration were analyzed using X-ray diffraction, optical microscopy and scanning electron microscopy. The Sn-3.5Ag-xTi active solders are used as metallic filler to join with anodized 6061 Al alloy for potential applications of providing a higher heat conduction path. Their joints and mechanical properties were characterized and evaluated in terms of titanium content. The mechanical property of joints was measured by shear testing. The joint strength was very dependent on the titanium content. Solder with a 0.5 wt.% Ti addition can successfully wet and bond to the anodized aluminum oxide layers of Al alloy and posses a shear strength of 16.28 {+-} 0.64 MPa. The maximum bonding strength reached 22.24 {+-} 0.70 MPa at a 3 wt.% Ti addition. Interfacial reaction phase and chemical composition were identified by a transmission electron microscope with energy dispersive spectrometer. Results showed that the Ti element reacts with anodized aluminum oxide to form Al{sub 3}Ti-rich and Al{sub 3}Ti phases at the joint interfaces. - Highlights: Black-Right-Pointing-Pointer Active solder joining of anodized Al alloy needs 0.5 wt.% Ti addition for Sn-3.5Ag. Black-Right-Pointing-Pointer The maximum bonding strength occurs at 3 wt.% Ti addition. Black-Right-Pointing-Pointer The Ti reacts with anodized Al oxide to form Al{sub 3}Ti-rich and Al{sub 3}Ti at joint interface.

Wang, Wei-Lin, E-mail: wangwl77@gmail.com; Tsai, Yi-Chia, E-mail: tij@itri.org.tw

2012-06-15T23:59:59.000Z

29

LINKING TYPE Ia SUPERNOVA PROGENITORS AND THEIR RESULTING EXPLOSIONS  

Science Conference Proceedings (OSTI)

Comparing the ejecta velocities at maximum brightness and narrow circumstellar/interstellar Na D absorption line profiles of a sample of 23 Type Ia supernovae (SNe Ia), we determine that the properties of SN Ia progenitor systems and explosions are intimately connected. As demonstrated by Sternberg et al., half of all SNe Ia with detectable Na D absorption at the host-galaxy redshift in high-resolution spectroscopy have Na D line profiles with significant blueshifted absorption relative to the strongest absorption component, which indicates that a large fraction of SN Ia progenitor systems have strong outflows. In this study, we find that SNe Ia with blueshifted circumstellar/interstellar absorption systematically have higher ejecta velocities and redder colors at maximum brightness relative to the rest of the SN Ia population. This result is robust at a 98.9%-99.8% confidence level, providing the first link between the progenitor systems and properties of the explosion. This finding is further evidence that the outflow scenario is the correct interpretation of the blueshifted Na D absorption, adding additional confirmation that some SNe Ia are produced from a single-degenerate progenitor channel. An additional implication is that either SN Ia progenitor systems have highly asymmetric outflows that are also aligned with the SN explosion or SNe Ia come from a variety of progenitor systems where SNe Ia from systems with strong outflows tend to have more kinetic energy per unit mass than those from systems with weak or no outflows.

Foley, Ryan J.; Kirshner, Robert P. [Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138 (United States); Simon, Joshua D.; Burns, Christopher R. [Observatories of the Carnegie Institution for Science, 813 Santa Barbara Street, Pasadena, CA 91101 (United States); Gal-Yam, Avishay [Benoziyo Center for Astrophysics, Faculty of Physics, Weizmann Institute of Science, Rehovot 76100 (Israel); Hamuy, Mario [Departamento de Astronomia, Universidad de Chile, Casilla 36-D, Santiago (Chile); Morrell, Nidia I.; Phillips, Mark M. [Las Campanas Observatory, Carnegie Observatories, Casilla 601, La Serena (Chile); Shields, Gregory A. [Department of Astronomy, University of Texas, Austin, TX 78712 (United States); Sternberg, Assaf, E-mail: rfoley@cfa.harvard.edu [Max-Planck-Institut fuer Astrophysik, Karl-Schwarzschild-Strasse 1, 85741 Garching (Germany)

2012-06-20T23:59:59.000Z

30

The investigation of die-pressing and sintering behavior of ITP CP-Ti and Ti-6Al-4V powders  

SciTech Connect

This paper investigated the die-pressing and sintering behavior of the low-cost CP-Ti and Ti-6Al- 4V powders made by the Armstrong Process . The Armstrong powders have an irregular coral like, dendritic morphology, with a dendrite size of approximately 2-5 m. As-received as well as milled powders were uniaxially pressed at designated pressures up to 690 MPa to form disk samples with different aspect ratios. In the studied pressure range, an empirical powder compaction equation was applied to linearize the green density pressure relationship, and powder compaction parameters were obtained. The Armstrong Ti-64 powder exhibited a significantly higher sinterability than the CP-Ti powder. This was explained to be due to the higher diffusivity of V at the sintering temperature. The Ti-64 samples with a green density of 71.0% increased to 99.6% after sintering at 1300oC for 1 hour. An ex-situ technique was used to track the powder morphology change before and after sintering.

Chen, Wei [ORNL; Yamamoto, Yukinori [ORNL; Peter, William H [ORNL; Clark, Michael B [ORNL; Nunn, Stephen D [ORNL; Kiggans, Jim [ORNL; Muth, Thomas R [ORNL; Blue, Craig A [ORNL; Williams, James C [Ohio State University; Fuller, Brian [International Titanium Powder; Akhtar, Kamal [International Titanium Powder

2012-01-01T23:59:59.000Z

31

Photoconductivity and Non-Exponential Relaxation at Insulating LaAlO3/SrTiO3 Interfaces  

SciTech Connect

LaAlO{sub 3} is grown on SrO terminated (100) SrTiO{sub 3}, and (110) SrTiO{sub 3}, producing insulating heterointerfaces without light. Photocurrent spectroscopy at low temperatures reveals a broad distribution of interface states between 2 eV and 2.7 eV at both interfaces, with a higher density in the (110) case concomitant with relatively shallow traps. The photocurrent relaxation can be well fitted by a stretched exponential form, confirming energetically distributed electron traps. Photo-carrier lifetimes are larger than a few hundred seconds for optical excitation approaching the SrTiO{sub 3} band-gap energy, providing the opportunity to study transient light-induced properties at low temperatures.

Kim, Minu; Bell, C.; Hikita, Y.; Kozuka, Y.; Kim, B.G.; Hwang, H.Y.

2012-08-17T23:59:59.000Z

32

Compression testing of a sintered Ti6Al4V powder compact for biomedical applications  

Science Conference Proceedings (OSTI)

In this study, the compression deformation behavior of a Ti6Al4V powder compact, prepared by the sintering of cold compacted atomized spherical particles (100-200 {mu}m) and containing 36-38% porosity, was investigated at quasi-static (1.6x10{sup -3}-1.6x10{sup -1} s{sup -1}) and high strain rates (300 and 900 s{sup -1}) using, respectively, conventional mechanical testing and Split Hopkinson Pressure Bar techniques. Microscopic studies of as-received powder and sintered powder compact showed that sintering at high temperature (1200 deg. C) and subsequent slow rate of cooling in the furnace changed the microstructure of powder from the acicular alpha ({alpha}) to the Widmanstaetten ({alpha}+{beta}) microstructure. In compression testing, at both quasi-static and high strain rates, the compact failed via shear bands formed along the diagonal axis, 45 deg. to the loading direction. Increasing the strain rate was found to increase both the flow stress and compressive strength of the compact but it did not affect the critical strain for shear localization. Microscopic analyses of failed samples and deformed but not failed samples of the compact further showed that fracture occurred in a ductile (dimpled) mode consisting of void initiation and growth in {alpha} phase and/or at the {alpha}/{beta} interface and macrocracking by void coalescence in the interparticle bond region.

Guden, M. [Department of Mechanical Engineering, Izmir Institute of Technology, Gulbahce Koyu, Urla, Izmir (Turkey); Center for Materials Research, Izmir Institute of Technology, Gulbahce Koyu, Urla, Izmir (Turkey); E-mail: mustafaguden@iyte.edu.tr; Celik, E. [Materials Science and Engineering Program, Izmir Institute of Technology, Gulbahce Koyu, Urla, Izmir (Turkey); Akar, E. [Department of Mechanical Engineering, Izmir Institute of Technology, Gulbahce Koyu, Urla, Izmir (Turkey); Cetiner, S. [Hipokrat A.S., 407/6 Sok., No:10, Pinarbasi, Izmir (Turkey)

2005-05-15T23:59:59.000Z

33

Production of 26Al, 44Ti and 60Fe in Supernovae-sensitivity to the helium burning rates  

E-Print Network (OSTI)

We have studied the sensitivity of supernova production of the gamma emitting nuclei 26Al, 44Ti and 60Fe to variations of the rates of the triple alpha and 12C(alpha, gamma) reactions. Over a range of twice their experimental uncertainties we find variations in the production of 60Fe by more than a factor of five. Smaller variations, about a factor of two to three, were observed for 26Al and 44Ti. The yields of these isotopes change significantly when the abundances of Lodders (2003) are used instead of those of Anders and Grevesse (1989). These sensitivities will limit conclusions based on a comparison of observed gamma ray intensities and stellar models until the helium burning rates are better known. Prospects for improving the helium burning rates are discussed and a new version of the Boyes rate for 12C(alpha, gamma} is presented.

Clarisse Tur; Alexander Heger; Sam M. Austin

2010-12-21T23:59:59.000Z

34

Effect of Aging on Mechanical Properties of Ti-Mo-Al Biomedical ...  

Science Conference Proceedings (OSTI)

For the case of Ti-Ni, cold work and aging at intermediate temperatures are utilized to improve shape memory effect through hardening. Therefore, in this work, ...

35

INVESTIGATION OF NOVEL ALLOY TiC-Ni-Ni3Al FOR SOLID OXIDE FUEL CELL INTERCONNECT APPLICATIONS  

DOE Green Energy (OSTI)

Solid oxide fuel cell interconnect materials must meet stringent requirements. Such interconnects must operate at temperatures approaching 800 C while resisting oxidation and reduction, which can occur from the anode and cathode materials and the operating environment. They also must retain their electrical conductivity under these conditions and possess compatible coefficients of thermal expansion as the anode and cathode. Results are presented in this report for fuel cell interconnect candidate materials currently under investigation based upon nano-size titanium carbide (TiC) powders. The TiC is liquid phase sintered with either nickel (Ni) or nickel-aluminide (Ni{sub 3}Al) in varying concentrations. The oxidation resistance of the submicron grain TiC-metal materials is presented as a function weight change versus time at 700 C and 800 C for varying content of metal/intermetallic in the system. Electrical conductivity at 800 C as a function of time is also presented for TiC-Ni to demonstrate the vitality of these materials for interconnect applications. TGA studies showed that the weight gain was 0.8 mg/cm{sup 2} for TiC(30)-Ni(30wt.%) after 100 hours in wet air at 800 C and the weight gain was calculated to be 0.5205 mg/cm{sup 2} for TiC(30)- Ni(10 wt.%) after 100 hours at 700 C and 100 hours at 800 C. At room temperature the electrical conductivity was measured to be 2444 1/[ohm.cm] for TiC-Ni compositions. The electrical conductivities at 800 C in air was recorded to be 19 1/[ohm.cm] after 125 hours. Two identical samples were supplied to PNNL (Dr. Jeff Stevenson) for ASR testing during the pre-decision period and currently they are being tested there. Fabrication, oxidation resistance and electrical conductivity studies indicate that TiC-Ni-Ni{sub 3}Al ternary appears to be a very important system for the development of interconnect composition for solid oxide fuel cells.

Rasit Koc; Geoffrey Swift; Hua Xie

2005-01-25T23:59:59.000Z

36

Type Ia Supernovae Project at NERSC  

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

Type Ia Supernovae Type Ia Supernovae Supernova-1.jpg Update: Recent Berkeley Lab Computing Sciences News about supernovae: read more... Key Challenges: Understanding Type Ia...

37

Prediction of material removal rate for Ti-5Al-2.5Sn in EDM using multi-layered perceptron neural network technique  

Science Conference Proceedings (OSTI)

Extensive work has been reported on modelling and optimization for different materials such as aluminum, iron, nickel-base alloy, C40 steel, mild steel, Ti6Al4V, HE15, 15CDV6, M-250, AISI D2 steel material etc. However model of process parameters for ... Keywords: EDM, Ti-5Al-2.5Sn, artificial neural network, material removal rate, multi layer perceptron

M. M. Rahman; Md. Ashikur Rahman Khan; K. Kadirgama; Rosli A. Bakar

2011-04-01T23:59:59.000Z

38

The elevated-temperature mechanical behavior of as-cast and wrought Ti-6Al-4V-1B  

Science Conference Proceedings (OSTI)

This work studied the effect of processing on the elevated-temperature [728 K (455 C)] fatigue deformation behavior of Ti-6Al-4V-1B for maximum applied stresses between 300 to 700 MPa (R = 0.1, 5 Hz). The alloy was evaluated in the as-cast form as well as in three wrought forms: cast-and-extruded, powder metallurgy (PM) rolled, and PM extruded. Processing caused significant differences in the microstructure, which in turn impacted the fatigue properties. The PM-extruded material exhibited a fine equiaxed {alpha} + {beta} microstructure and the greatest fatigue resistance among all the studied materials. The {beta}-phase field extrusion followed by cooling resulted in a strong {alpha}-phase texture in which the basal plane was predominately oriented perpendicular to the extrusion axis. The TiB whiskers were also aligned in the extrusion direction. The {alpha}-phase texture in the extrusions resulted in tensile-strength anisotropy. The tensile strength in the transverse orientation was lower than that in the longitudinal orientation, but the strength in the transverse orientation remained greater than that for the as-cast Ti-6Al-4V. The ratcheting behavior during fatigue is also discussed.

Chen, Wei [ORNL; Boehlert, C. J. [Michigan State University, East Lansing; Howe, Jane Y [ORNL; Payzant, E Andrew [ORNL

2011-01-01T23:59:59.000Z

39

Effects of Processing Parameters on Macrozone Formation in Ti-6Al ...  

Science Conference Proceedings (OSTI)

Composition Design of Multi-Component ?-Ti Alloys Based on a Cluster Model · Consolidation of Blended Titanium/Magnesium Powders by Microwave Processing ... Rheological Properties of Feedstock Composed of Titanium Alloy Powder ...

40

XRD and NMR investigation of Ti-compound formation in solution-doping of sodium aluminum hydrides: Solubility of Ti in NaAlH4 crystals grown in THF  

DOE Green Energy (OSTI)

Sodium aluminum hydrides have gained attention due to their high hydrogen weight percent (5.5% ideal) compared to interstitial hydrides, and as a model for hydrides with even higher hydrogen weight fraction. The purpose of this paper is to investigate the Ti-compounds that are formed under solution-doping techniques, such as wet doping in solvents such as tetrahydrofuran (THF). Compound formation in Ti-doped sodium aluminum hydrides is investigated using x-ray diffraction (XRD) and magic angle spinning (MAS) nuclear magnetic resonance (NMR). We present lattice parameter measurements of crushed single crystals, which were exposed to Ti during growth. Rietveld refinements indicate no lattice parameter change and thus no solubility for Ti in NaAlH{sub 4} by this method of exposure. In addition, x-ray diffraction data indicate that no Ti substitutes in NaH, the final decomposition product for the alanate. Reaction products of completely reacted (33.3 at. %-doped) samples that were solvent-mixed or mechanically milled are investigated. Formation of TiAl{sub 3} is observed in mechanically milled materials, but not solution mixed samples, where bonding to THF likely stabilizes Ti-based nano-clusters. The Ti in these clusters is activated by mechanical milling.

Majzoub, E H; Herberg, J L; Stumpf, R; Spangler, S; Maxwell, R S

2004-08-26T23:59:59.000Z

Note: This page contains sample records for the topic "ti ia al" 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

Step-Wise Exothermic Reactions in Cold-Rolled Ni/Al, Ti/Al, and Ta ...  

Science Conference Proceedings (OSTI)

Aerosol Route Synthesis of Copper Oxide Nanoparticles Using Copper Nitrate Solution · AlGaAs-Based Optical ... Defect Energetics and Fission Product Transport in ZrC ... Enhancing Mineral Beneficiation by High Intensity Power Ultrasound.

42

Ductile-reinforcement toughening in [gamma]-TiAl intermetallic-matrix composites: Effects on fracture toughness and fatigue-crack propagation resistance  

Science Conference Proceedings (OSTI)

The influence of the type, volume fraction, thickness and orientation of ductile phase reinforcements on the room temperature fatigue and fracture resistance of [gamma]-TiAl intermetallic alloys is investigated. Large improvements in toughness compared to monolithic [gamma]-TiAl are observed in both the TiNb- and Nb-reinforced composites under monotonic loading. Toughness increases with increasing ductile phase content, reinforcement thickness and strength; orientation effect are minimal. Crack-growth behavior is characterized by steep resistance curves primarily due to crack trapping/renucleation and extensive crack bridging by the ductile-phase particles. In contrast, under cyclic loading the influence of ductile phases on fatigue resistance is strongly dependent upon reinforcement orientation. Compared to monolithic [gamma]-TiAl, improvements in fatigue-crack growth resistance are observed in TiNb-reinforced composites only in the face (C-L) orientation; crack-growth rates for the edge (C-R) orientation are actually faster in the composite. In comparison, Nb-particle reinforcements offer less toughening under monotonic loading but enhance the fatigue properties compared to TiNb reinforcements under cyclic loading.

Venkateswara Rao, K.T.; Ritchie, R.O. (Univ. of California, Berkeley (United States). Dept. of Materials Science and Mineral Engineering); Odette, G.R. (Univ. of California, Santa Barbara (United States). Materials Dept.)

1994-03-01T23:59:59.000Z

43

Simply AlF3-treated Li4Ti5O12 composite anode materials for stable and ultrahigh power lithium-ion batteries  

SciTech Connect

The commercial Li4Ti5O12 (LTO) is successfully modified by AlF3 via a low temperature process. After being calcined at 400oC for 5 hours, AlF3 reacts with LTO to form a composite material which mainly consists of Al3+ and F- co-doped LTO with small amounts of anatase TiO2 and Li3AlF6. Al3+ and F- co-doped LTO demonstrates largely improved rate capability comparing to the pristine LTO. Since the amount of the byproduct TiO2 is relatively small, the modified LTO electrodes retain the main voltage characteristics of LTO with a minor feature similar to those of anatase TiO2. The doped LTO anodes deliver higher discharge capacity and significantly improved high-rate performance when compared to the pristine LTO anode. They also demonstrate excellent long-term cycling stability at elevated temperatures. Therefore, Al3+ and F- co-doped LTO synthesized at low temperature is an excellent anode for stable and ultra-high power lithium-ion batteries.

Xu, Wu; Chen, Xilin; Wang, Wei; Choi, Daiwon; Ding, Fei; Zheng, Jianming; Nie, Zimin; Choi, Young Joon; Zhang, Jiguang; Yang, Zhenguo

2013-08-15T23:59:59.000Z

44

Effect of Ti and Ta on the Creep Properties of Single Crystal Co-Al-W ...  

Science Conference Proceedings (OSTI)

About this Abstract. Meeting, 2014 TMS Annual Meeting & Exhibition. Symposium , High-temperature Gamma (f.c.c.) /Gamma-Prime (L12 structure) Co-Al-W ...

45

Category:Mason, IA | Open Energy Information  

Open Energy Info (EERE)

IA IA Jump to: navigation, search Go Back to PV Economics By Location Media in category "Mason, IA" The following 16 files are in this category, out of 16 total. SVQuickServiceRestaurant Mason IA MidAmerican Energy Co (Iowa).png SVQuickServiceRestaura... 64 KB SVFullServiceRestaurant Mason IA MidAmerican Energy Co (Iowa).png SVFullServiceRestauran... 64 KB SVHospital Mason IA MidAmerican Energy Co (Iowa).png SVHospital Mason IA Mi... 73 KB SVLargeHotel Mason IA MidAmerican Energy Co (Iowa).png SVLargeHotel Mason IA ... 72 KB SVLargeOffice Mason IA MidAmerican Energy Co (Iowa).png SVLargeOffice Mason IA... 73 KB SVMediumOffice Mason IA MidAmerican Energy Co (Iowa).png SVMediumOffice Mason I... 69 KB SVMidriseApartment Mason IA MidAmerican Energy Co (Iowa).png

46

Built-in and Induced Polarization Across LaAlO3/SrTiO3 Heterojunctions  

Science Conference Proceedings (OSTI)

Ionic crystals terminated at oppositely charged polar surfaces are inherently unstable and expected to undergo surface reconstructions to maintain electrostatic stability. Essentially, an electric field that arises between oppositely charged atomic planes gives rise to a built-in potential that diverges with thickness. Here we present evidence of such a built-in potential across polar LaAlO{sub 3} thin films grown on SrTiO{sub 3} substrates, a system well known for the electron gas that forms at the interface. By performing tunneling measurements between the electron gas and metallic electrodes on LaAlO{sub 3} we measure a built-in electric field across LaAlO{sub 3} of 80.1 meV/{angstrom}. Additionally, capacitance measurements reveal the presence of an induced dipole moment across the heterostructure. We forsee use of the ionic built-in potential as an additional tuning parameter in both existing and novel device architectures, especially as atomic control of oxide interfaces gains widespread momentum.

Guneeta, Singh-Bhalla

2011-08-15T23:59:59.000Z

47

Impact toughness Enhancement of an Electron Beam Welded Ti-6Al ...  

Science Conference Proceedings (OSTI)

Aerosol Route Synthesis of Copper Oxide Nanoparticles Using Copper Nitrate Solution · AlGaAs-Based Optical ... Defect Energetics and Fission Product Transport in ZrC ... Enhancing Mineral Beneficiation by High Intensity Power Ultrasound.

48

Formation mechanism of linear friction welded Ti-6Al-4V alloy joint based on microstructure observation  

Science Conference Proceedings (OSTI)

The microstructure of the linear friction welded Ti-6Al-4V titanium alloy joint was investigated by optical microscope, scanning electronic microscope and transmission electron microscope. Results show that the dynamic recovery and recrystallization resulting from the intensive plastic deformation and fast heating and cooling processes during linear friction welding account for the superfine {alpha} + {beta} grains in the weld center. Fine {alpha} grains distribute in the {beta} matrix or at the boundaries of {beta} grains. A mass of dislocations networks and metastructures present within the {alpha} and {beta} grains. - Research Highlights: {yields} TEM is employed in the analysis. {yields} The dynamic recovery is the main mechanism in thermal deformation of TC4. {yields} Superfine grains in the weld result from dynamic recovery and dynamic recrystallizaion, but the recrystallization is inadequate.

Ma Tiejun; Chen Tao, E-mail: ctwc-13@163.com; Li Wenya; Wang Shiwei; Yang Siqian

2011-01-15T23:59:59.000Z

49

The influence of hydrogen gas exposure and low temperature on the tribological characteristics of ti-6al-4v  

E-Print Network (OSTI)

This research studies individual and combined effects of hydrogen gas exposure and low temperature on the tribological characteristics of Ti-6Al-4V. Experimental approaches include test system modification and tribological analysis. An existing ballon- disk tribometer was modified to allow liquid nitrogen to be constantly injected into an insulated test chamber to enable testing at low temperature. Twelve 3.8 cm diameter Ti-6Al-4V disks were manufactured and polished, then half were exposed to pure hydrogen gas at elevated temperature and pressure and the remaining disks were untreated. The testing was split in to four groups of three disks based on testing temperature and previous hydrogen exposure. A silicon nitride ball was used for all tests. Each group was tested at two normal loads, 10N and 20N, at the same linear speed. Group 1 was unexposed and tested at room temperature, Group 2 was unexposed and tested at low temperature, Group 3 was exposed and tested at room temperature and Group 4 was exposed and tested at low temperature. Average friction coefficients and the specific wear rate were calculated from the test data. Also high-resolution digital microscope imaging was used to observe and characterize the wear mechanisms of the four groups of samples. Results show that hydrogen exposure facilitated adhesive wear of the surface and that low temperature induced a slip-stick wear mechanism under higher loads, but not at lower loads and regardless of exposure to hydrogen gas. This research opens avenues for future investigation in effects of hydrogen and low temperature embrittlement on the tribological performance of materials. With the increasing interests in hydrogen energy, the present work established a foundation for future study.

Gola, Ryan Travis

2008-12-01T23:59:59.000Z

50

Structural Comparison of n-type and p-type LaAlO3/SrTiO3 Interfaces  

Science Conference Proceedings (OSTI)

Using a surface x-ray diffraction technique, we investigated the atomic structure of two types of interfaces between LaAlO{sub 3} and SrTiO{sub 3}, that is, p-type (SrO/AlO{sub 2}) and n-type (TiO{sub 2}/LaO) interfaces. Our results demonstrate that the SrTiO{sub 3} in the sample with the n-type interface has a large polarized region, while that with the p-type interface has a limited polarized region. In addition, the atomic intermixing was observed to extend deeper into STO substrate at the n-type interface than at the p-type. These differences result in different degrees of band bending, which likely contributes to the striking difference in electrical conductivity between the two types of interfaces.

Bell, Christopher

2011-08-19T23:59:59.000Z

51

Linear surface smoothening of (Ti{sub 0.48}Al{sub 0.52})N thin films grown on rough substrates  

SciTech Connect

The evolution of surface roughness during the growth of sputter-deposited solid solution (Ti{sub 0.48}Al{sub 0.52})N films on rough high-speed-steel (HSS) substrates has been studied by atomic force microscopy. It has been revealed that the growing (Ti{sub 0.48}Al{sub 0.52})N/HSS film experiences a continuous surface smoothening. Scaling analyses along with surface power spectra calculation of the (Ti{sub 0.48}Al{sub 0.52})N films grown on smooth Si(100) substrates under the same deposition conditions indicate that this surface smoothening is linear and can be explained by a simple linear equation with surface diffusion as the smoothening mechanism and shot noise as the roughening effect. The observed linear surface smoothening in (Ti{sub 0.48}Al{sub 0.52})N/HSS films has also been confirmed by our numerical simulations of the film growth using real HSS and Si(100) substrates as their initial growth conditions and can be understood in terms of the competition between the surface-diffusion-induced decrease in substrate roughness contribution and the noise-driven roughening effect.

Liu, Z.-J.; Shum, P.W.; Shen, Y.G. [Department of Manufacturing Engineering and Engineering Management (MEEM), City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong (China)

2005-06-20T23:59:59.000Z

52

Prospective Type Ia supernova surveys from Dome A  

E-Print Network (OSTI)

Prospective Type Ia Supernova Surveys From Dome A A. Kim a ,are conducive toward Type Ia supernova surveys forheterogeneities within the Type Ia supernova class, reducing

Kim, A.

2010-01-01T23:59:59.000Z

53

Plasma plume effects on the conductivity of amorphous-LaAlO{sub 3}/SrTiO{sub 3} interfaces grown by pulsed laser deposition in O{sub 2} and Ar  

SciTech Connect

Amorphous-LaAlO{sub 3}/SrTiO{sub 3} interfaces exhibit metallic conductivity similar to those found for the extensively studied crystalline-LaAlO{sub 3}/SrTiO{sub 3} interfaces. Here, we investigate the conductivity of the amorphous-LaAlO{sub 3}/SrTiO{sub 3} interfaces grown in different pressures of O{sub 2} and Ar background gases. During the deposition, the LaAlO{sub 3} ablation plume is also studied, in situ, by fast photography and space-resolved optical emission spectroscopy. An interesting correlation between interfacial conductivity and kinetic energy of the Al atoms in the plume is observed: to assure conducting interfaces of amorphous-LaAlO{sub 3}/SrTiO{sub 3}, the kinetic energy of Al should be higher than 1 eV. Our findings add further insights on mechanisms leading to interfacial conductivity in SrTiO{sub 3}-based oxide heterostructures.

Sambri, A.; Amoruso, S.; Bruzzese, R.; Wang, X. [CNR-SPIN and Dipartimento di Scienze Fisiche, Complesso Universitario di Monte Sant'Angelo, Via Cintia, I-80125 Napoli (Italy); Cristensen, D. V.; Trier, F.; Chen, Y. Z.; Pryds, N. [Department of Energy Conversion and Storage, Risoe Campus, Technical University of Denmark, DK-4000 Roskilde (Denmark)

2012-06-04T23:59:59.000Z

54

Improved Off-State Stress Critical Voltage on AlGaN/GaN High Electron Mobility Transistors Utilizing Pt/Ti/Au Based Gate Metallization  

Science Conference Proceedings (OSTI)

The critical voltage for degradation of AlGaN/GaN high electron mobility transistors (HEMTs) employed with the Pt/Ti/Au gate metallization instead of the commonly used Ni/Au was significantly increased during the off-state stress. The typical critical voltage for HEMTs with Ni/Au gate metallization was around -60V. By sharp contrast, no critical voltage was observed for the HEMTs with Pt/Ti/Au gate metallization, even up to -100V, which was the instrumental limitation in this experiment. Both Schottky forward and reverse gate characteristics of the Ni/Au degraded once the gate voltage passed the critical voltage of around -60V. There was no degradation exhibited for the HEMTs with Pt-gated HEMTs.

Lo, C. F. [University of Florida; Liu, L. [University of Florida, Gainesville; Kang, Tsung Sheng [University of Florida, Gainesville; Davies, Ryan [University of Florida; Gila, Brent P. [University of Florida, Gainesville; Pearton, S. J. [University of Florida; Kravchenko, Ivan I [ORNL; Laboutin, O. [Kopin Corporation, Taunton, MA; Cao, Yu [Kopin Corporation, Taunton, MA; Johnson, Wayne J. [Kopin Corporation, Taunton, MA; Ren, F. [University of Florida

2011-01-01T23:59:59.000Z

55

Excellent Passivation and Low Reflectivity Al2O3/TiO2 Bilayer Coatings for n-Wafer Silicon Solar Cells: Preprint  

DOE Green Energy (OSTI)

A bilayer coating of Al2O3 and TiO2 is used to simultaneously achieve excellent passivation and low reflectivity on p-type silicon. This coating is targeted for achieving high efficiency n-wafer Si solar cells, where both passivation and anti-reflection (AR) are needed at the front-side p-type emitter. It could also be valuable for front-side passivation and AR of rear-emitter and interdigitated back contact p-wafer cells. We achieve high minority carrier lifetimes {approx}1 ms, as well as a nearly 2% decrease in absolute reflectivity, as compared to a standard silicon nitride AR coating.

Lee, B. G.; Skarp, J.; Malinen, V.; Li, S.; Choi, S.; Branz, H. M.

2012-06-01T23:59:59.000Z

56

Comparison of dc performance of Pt/Ti/Au- and Ni/Au-Gated AlGaN/GaN High Electron Mobility Transistors  

Science Conference Proceedings (OSTI)

We have demonstrated significant improvements of AlGaN/GaN High Electron Mobility Transistors (HEMTs) dc performance by employing Pt/Ti/Au instead of the conventional Ni/Au gate metallization. During off-state bias stressing, the typical critical voltage for HEMTs with Ni/Au gate metallization was ~ -45 to -65V. By sharp contrast, no critical voltage was observed for HEMTs with Pt/Ti/Au gate metallization, even up to -100V, which was the instrumental limitation in this experiment. After the off-state stressing, the drain current of Ni/Au gated-HEMTs decreased by~ 15%. For the Pt-gate HEMTs, no degradation of the drain current occurred and there were minimal changes in the Schottky gate characteristics for both forward and reverse bias conditions. The HEMTs with Pt/Ti/Au metallization showed an excellent drain on/off current ratio of 1.5 108. The on/off drain current ratio of Ni-gated HEMTs was dependent on the drain bias voltage and ranged from 1.2 107 at Vds=5V and 6 105

Liu, L. [University of Florida, Gainesville; Lo, C. F. [University of Florida; Kang, Tsung Sheng [University of Florida, Gainesville; Pearton, S. J. [University of Florida; Kravchenko, Ivan I [ORNL; Laboutin, O. [Kopin Corporation, Taunton, MA; Johnson, Wayne J. [Kopin Corporation, Taunton, MA; Ren, F. [University of Florida

2011-01-01T23:59:59.000Z

57

Turbulent Combustion in Type Ia Supernova Models  

E-Print Network (OSTI)

We review the astrophysical modeling of type Ia supernova explosions and describe numerical methods to implement numerical simulations of these events. Some results of such simulations are discussed.

F. K. Roepke; W. Hillebrandt

2006-09-15T23:59:59.000Z

58

New approaches for modeling type Ia supernovae  

SciTech Connect

Type Ia supernovae (SNe Ia) are the largest thermonuclearexplosions in the Universe. Their light output can be seen across greatstances and has led to the discovery that the expansion rate of theUniverse is accelerating. Despite the significance of SNe Ia, there arestill a large number of uncertainties in current theoretical models.Computational modeling offers the promise to help answer the outstandingquestions. However, even with today's supercomputers, such calculationsare extremely challenging because of the wide range of length and timescales. In this paper, we discuss several new algorithms for simulationsof SNe Ia and demonstrate some of their successes.

Zingale, Michael; Almgren, Ann S.; Bell, John B.; Day, Marcus S.; Rendleman, Charles A.; Woosley, Stan

2007-06-25T23:59:59.000Z

59

Theoretical cosmic Type Ia supernova rates  

E-Print Network (OSTI)

The aim of this work is the computation of the cosmic Type Ia supernova rates at very high redshifts (z>2). We adopt various progenitor models in order to predict the number of explosions in different scenarios for galaxy formation and to check whether it is possible to select the best delay time distribution model, on the basis of the available observations of Type Ia supernovae. We also computed the Type Ia supernova rate in typical elliptical galaxies of different initial luminous masses and the total amount of iron produced by Type Ia supernovae in each case. It emerges that: it is not easy to select the best delay time distribution scenario from the observational data and this is because the cosmic star formation rate dominates over the distribution function of the delay times; the monolithic collapse scenario predicts an increasing trend of the SN Ia rate at high redshifts whereas the predicted rate in the hierarchical scheme drops dramatically at high redshift; for the elliptical galaxies we note that the predicted maximum of the Type Ia supernova rate depends on the initial galactic mass. The maximum occurs earlier (at about 0.3 Gyr) in the most massive ellipticals, as a consequence of downsizing in star formation. We find that different delay time distributions predict different relations between the Type Ia supernova rate per unit mass at the present time and the color of the parent galaxies and that bluer ellipticals present higher supernova Type Ia rates at the present time.

R. Valiante; F. Matteucci; S. Recchi; F. Calura

2008-07-15T23:59:59.000Z

60

Steamboat IA Geothermal Facility | Open Energy Information  

Open Energy Info (EERE)

IA Geothermal Facility IA Geothermal Facility Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Steamboat IA Geothermal Facility General Information Name Steamboat IA Geothermal Facility Facility Steamboat IA Sector Geothermal energy Location Information Location Washoe, Nevada Coordinates 40.5608387°, -119.6035495° 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":40.5608387,"lon":-119.6035495,"alt":0,"address":"","icon":"","group":"","inlineLabel":"","visitedicon":""}]}

Note: This page contains sample records for the topic "ti ia al" 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

g-MODE EXCITATION DURING THE PRE-EXPLOSIVE SIMMERING OF TYPE Ia SUPERNOVAE  

SciTech Connect

Prior to the explosive burning of a white dwarf (WD) that makes a Type Ia supernova (SN Ia), the star 'simmers' for {approx}10{sup 3} yr in a convecting, carbon-burning region. I estimate the excitation of g-modes by convection during this phase and explore their possible effect on the WD. As these modes propagate from the core of the WD toward its surface, their amplitudes grow with decreasing density. Once the modes reach nonlinear amplitudes, they break and deposit their energy into a shell of mass {approx}10{sup -4} M{sub sun}. This raises the surface temperature by {approx}4 x 10{sup 8} K, which is sufficient to ignite a layer of helium, as is expected to exist for some SN Ia scenarios. This predominantly synthesizes {sup 40}Ca, but some amount of {sup 28}Si, {sup 32}S, and {sup 44}Ti may also be present. These ashes are expanded out with the subsequent explosion up to velocities of {approx}20, 000 km s{sup -1}, which may explain the high velocity features (HVFs) seen in many SNe Ia. The appearance of HVFs would therefore be a useful discriminant for determining between progenitors, since a flammable helium-rich layer will not be present for accretion from a C/O WD as in a merger scenario. I also discuss the implications of {sup 44}Ti production.

Piro, Anthony L., E-mail: piro@caltech.edu [Theoretical Astrophysics, California Institute of Technology, 1200 E California Blvd., M/C 350-17, Pasadena, CA 91125 (United States)

2011-09-01T23:59:59.000Z

62

Could There Be A Hole In Type Ia Supernovae?  

E-Print Network (OSTI)

In the favored progenitor scenario, Type Ia supernovae arise from a white dwarf accreting material from a non-degenerate companion star. Soon after the white dwarf explodes, the ejected supernova material engulfs the companion star; two-dimensional hydrodynamical simulations by Marietta et. al. show that, in the interaction, the companion star carves out a conical hole of opening angle 30-40 degrees in the supernova ejecta. In this paper we use multi-dimensional Monte Carlo radiative transfer calculations to explore the observable consequences of an ejecta-hole asymmetry. We calculate the variation of the spectrum, luminosity, and polarization with viewing angle for the aspherical supernova near maximum light. We find that the supernova looks normal from almost all viewing angles except when one looks almost directly down the hole. In the latter case, one sees into the deeper, hotter layers of ejecta. The supernova is relatively brighter and has a peculiar spectrum characterized by more highly ionized species, weaker absorption features, and lower absorption velocities. The spectrum viewed down the hole is comparable to the class of SN 1991T-like supernovae. We consider how the ejecta-hole asymmetry may explain the current spectropolarimetric observations of SNe Ia, and suggest a few observational signatures of the geometry. Finally, we discuss the variety currently seen in observed SNe Ia and how an ejecta-hole asymmetry may fit in as one of several possible sources of diversity.

Daniel Kasen; Peter Nugent; R. C. Thomas; Lifan Wang

2003-11-01T23:59:59.000Z

63

The progenitors of subluminous type Ia supernovae  

DOE Green Energy (OSTI)

We find that spectroscopically peculiar subluminous SNe Ia come from an old population. Of the thirteen subluminous SNe Ia known, nine are found in E/S0 galaxies, and the remainder are found in early-type spirals. The probability that this is a chance occurrence is only 0.1%. The finding that subluminous SNe Ia are associated with an older stellar population indicates that for a sufficiently large lookback time (already accessible in current high redshift searches) they will not be found. Due to a scarcity in old populations, hydrogen and helium main sequence stars and He red giant stars that undergo Roche lobe overflow are unlikely to be the progenitors of subluminous SNe Ia. Earlier findings that overluminous SNe Ia (DELTA m{sub 15} (B) < 0.94) come from a young progenitor population are confirmed. The fact that subluminous SNe Ia and overluminous SNe Ia come from different progenitor populations and also have different properties is a prediction of the CO white dwarf merger progenitor scenario.

Howell, D. Andrew

2001-02-01T23:59:59.000Z

64

Rates and progenitors of type Ia supernovae  

SciTech Connect

The remarkable uniformity of Type Ia supernovae has allowed astronomers to use them as distance indicators to measure the properties and expansion history of the Universe. However, Type Ia supernovae exhibit intrinsic variation in both their spectra and observed brightness. The brightness variations have been approximately corrected by various methods, but there remain intrinsic variations that limit the statistical power of current and future observations of distant supernovae for cosmological purposes. There may be systematic effects in this residual variation that evolve with redshift and thus limit the cosmological power of SN Ia luminosity-distance experiments. To reduce these systematic uncertainties, we need a deeper understanding of the observed variations in Type Ia supernovae. Toward this end, the Nearby Supernova Factory has been designed to discover hundreds of Type Ia supernovae in a systematic and automated fashion and study them in detail. This project will observe these supernovae spectrophotometrically to provide the homogeneous high-quality data set necessary to improve the understanding and calibration of these vital cosmological yardsticks. From 1998 to 2003, in collaboration with the Near-Earth Asteroid Tracking group at the Jet Propulsion Laboratory, a systematic and automated searching program was conceived and executed using the computing facilities at Lawrence Berkeley National Laboratory and the National Energy Research Supercomputing Center. An automated search had never been attempted on this scale. A number of planned future large supernovae projects are predicated on the ability to find supernovae quickly, reliably, and efficiently in large datasets. A prototype run of the SNfactory search pipeline conducted from 2002 to 2003 discovered 83 SNe at a final rate of 12 SNe/month. A large, homogeneous search of this scale offers an excellent opportunity to measure the rate of Type Ia supernovae. This thesis presents a new method for analyzing the true sensitivity of a multi-epoch supernova search and finds a Type Ia supernova rate from z {approx} 0.01-0.1 of r{sub V} = 4.26{sub -1.93 -0.10}{sup +1.39 +0.10} h{sup 3} x 10{sup -4} SNe Ia/yr/Mpc{sup 3} from a preliminary analysis of a subsample of the SNfactory prototype search. Several unusual supernovae were found in the course of the SNfactory prototype search. One in particular, SN 2002ic, was the first SN Ia to exhibit convincing evidence for a circumstellar medium and offers valuable insight into the progenitors of Type Ia supernovae.

Wood-Vasey, William Michael

2004-08-16T23:59:59.000Z

65

The effect of doping on global lattice properties of magnetite Fe{sub 3-x}Me{sub x}O{sub 4} (Me=Zn, Ti and Al)  

Science Conference Proceedings (OSTI)

X-ray powder diffraction was measured in Fe{sub 3-x}Me{sub x}O{sub 4} (Me=Zn, Ti, Al; x<0.065), in T range 70-300 K to see the effect of different doping on global lattice properties. The experimental results have shown that some lattice properties (e.g., the cell volume) are dopand specific. This can be attributed to the difference in preferential sites occupation by dopants. As confirmed by EXAFS, Zn enters tetrahedral, while Ti octahedral lattice sites, differently affecting crucial octahedral iron positions in the spinel lattice. However, despite this fact, it was found that T dependence of both monoclinic angle and lattice parameters is universal for studied samples above and below the Verwey transition temperature T{sub V}. So, not the iron atoms in octahedral positions individually, but interactions between them are responsible for the Verwey transition character change with doping. - Graphical abstract: A low temperature magnetite cell volume vs. dopants content. Apparently, Zn, Ti and Al atoms have different effect on the global lattice properties at individual temperatures. However, the Verwey transition reacts to dopants in a similar manner, despite the different way the octahedral iron positions are affected. Highlights: Black-Right-Pointing-Pointer We measure powder diffraction and EXAFS on Fe{sub 3-x}Me{sub x}O{sub 4}, Me=Zn, Ti, Al (x<0.065), in T range 70-300 K. Black-Right-Pointing-Pointer XRD: atom-type independent changes of lattice parameters with T. Black-Right-Pointing-Pointer EXAFS: Zn replaces Fe on tetrahedral positions, Ti on octahedral positions. Black-Right-Pointing-Pointer Thus, some secondary interactions between ordering orbitals, not the primary one driving the Verwey transition, control the transition order.

Kakol, Z. [AGH - University of Science and Technology, Faculty of Physics and Applied Computer Science, al. Mickiewicza 30, 30-059 Krakow (Poland); Owoc, D. [University of Agriculture, Department of Forest Work Mechanization, al. Mickiewicza 21, 31-120 Krakow (Poland); Przewoznik, J.; Sikora, M.; Kapusta, C. [AGH - University of Science and Technology, Faculty of Physics and Applied Computer Science, al. Mickiewicza 30, 30-059 Krakow (Poland); Zajac, D. [HASYLAB at DESY, Notkestrasse 85, Hamburg (Germany); Kozlowski, A., E-mail: kozlow@agh.edu.pl [AGH - University of Science and Technology, Faculty of Physics and Applied Computer Science, al. Mickiewicza 30, 30-059 Krakow (Poland); Sabol, J.E. [Chemical Consultant, Racine WI (United States); Honig, J.M. [Dept. of Chemistry, Purdue University, West Lafayette, IN (United States)

2012-08-15T23:59:59.000Z

66

Rolling Hills (IA) | Open Energy Information  

Open Energy Info (EERE)

Rolling Hills (IA) Rolling Hills (IA) Jump to: navigation, search Name Rolling Hills (IA) Facility Rolling Hills (IA) Sector Wind energy Facility Type Commercial Scale Wind Facility Status In Service Owner MidAmerican Energy Company Developer MidAmerican Energy Company Energy Purchaser MidAmerican Energy Company Location Massena IA Coordinates 41.230443°, -94.75459° 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":41.230443,"lon":-94.75459,"alt":0,"address":"","icon":"","group":"","inlineLabel":"","visitedicon":""}]}

67

On the Brightness of Supernova Ia  

E-Print Network (OSTI)

Before 1998 the universe expansion was thought to be slowing down. After 1998 the universe expansion is thought to be accelerating up. The key evidence came from the observed brightness of high redshift supernovae Ia in 1998. Astronomers found that the observed brightness of high redshift supernovae Ia is fainter than expected. Astronomers believe this means that the universe expansion is accelerating up. In this paper it is argued that if the ionized gas in the universe space is taken into account, then the brightness of the high redshift supernova Ia should be fainter than expected. The universe expansion does not need to be accelerating up. The exotic form of energy (dark energy) does not need to be introduce

Yijia Zheng

2013-10-01T23:59:59.000Z

68

Spectral diversity of Type Ia Supernovae  

E-Print Network (OSTI)

We use published spectroscopic and photometric data for 8 Type Ia supernovae to construct a dispersion spectrum for this class of object, showing their diversity over the wavelength range 3700A to 7100A. We find that the B and V bands are the spectral regions with the least dispersion, while the U band below 4100A is more diverse. Some spectral features such as the Si line at 6150A are also highly diverse. We then construct two objective measures of 'peculiarity' by (i) using the deviation of individual objects from the average SN Ia spectrum compared to the typical dispersion and (ii) applying principle component analysis. We demonstrate these methods on several SNe Ia that have previously been classified as peculiar.

J. Berian James; Tamara M. Davis; Brian P. Schmidt; Alex G. Kim

2006-05-05T23:59:59.000Z

69

The frequency and voltage dependent electrical characteristics of Al-TiW-Pd2Si/n-Si structure using I-V, C-V and G/?-V measurements  

Science Conference Proceedings (OSTI)

The forward and reverse bias capacitance-voltage (C-V) and conductance-voltage (G/w-V) characteristics of Al-TiW-Pd"2Si/n-Si structures have been investigated over a wide frequency range of 5kHz-5MHz. These measurements allow to us the determination ... Keywords: 73.30.+y, 73.40.Ns, 73.40.Qv, Frequency dependent, Interface states, MS structure, Pd2Si/n-Si contacts, Series resistance

?. M. Afandiyeva; ?. Dökme; ?. Alt?ndal; L. K. Abdullayeva; Sh. G. Askerov

2008-02-01T23:59:59.000Z

70

Visualizing Buoyant Burning Bubbles in Type Ia Supernovae at...  

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

Burning in Supernovae Buoyant Burning Bubbles in Type Ia Supernovae bubble-s.jpeg Flame ignition in type Ia supernovae leads to isolated bubbles of burning buoyant fluid. As a...

71

EARLY PHASE OBSERVATIONS OF EXTREMELY LUMINOUS TYPE Ia SUPERNOVA 2009dc  

Science Conference Proceedings (OSTI)

We present early phase observations in optical and near-infrared wavelengths for the extremely luminous Type Ia supernova (SN Ia) 2009dc. The decline rate of the light curve is DELTAm{sub 15}(B) = 0.65 +- 0.03, which is one of the slowest among SNe Ia. The peak V-band absolute magnitude is estimated to be M{sub V} = -19.90 +- 0.15 mag if no host extinction is assumed. It reaches M{sub V} = -20.19 +- 0.19 mag if we assume the host extinction of A{sub V} = 0.29 mag. SN 2009dc belongs to the most luminous class of SNe Ia, like SNe 2003fg and 2006gz. Our JHK{sub s} -band photometry shows that this SN is also one of the most luminous SNe Ia in near-infrared wavelengths. We estimate the ejected {sup 56}Ni mass of 1.2 +- 0.3 M{sub sun} for the no host extinction case (and of 1.6 +- 0.4 M{sub sun} for the host extinction of A{sub V} = 0.29 mag). The C II lambda6580 absorption line remains visible until a week after the maximum brightness, in contrast to its early disappearance in SN 2006gz. The line velocity of Si II lambda6355 is about 8000 km s{sup -1} around the maximum, being considerably slower than that of SN 2006gz. The velocity of the C II line is similar to or slightly less than that of the Si II line around the maximum. The presence of the carbon line suggests that the thick unburned C+O layer remains after the explosion. Spectropolarimetric observations by Tanaka et al. indicate that the explosion is nearly spherical. These observational facts suggest that SN 2009dc is a super-Chandrasekhar mass SN Ia.

Yamanaka, M.; Arai, A.; Chiyonobu, S.; Fukazawa, Y.; Ikejiri, Y.; Itoh, R.; Komatsu, T.; Miyamoto, H. [Department of Physical Science, Hiroshima University, Kagamiyama 1-3-1, Higashi-Hiroshima 739-8526 (Japan); Kawabata, K. S. [Hiroshima Astrophysical Science Center, Hiroshima University, Higashi-Hiroshima, Hiroshima 739-8526 (Japan); Kinugasa, K.; Hashimoto, O.; Honda, S. [Gunma Astronomical Observatory, Takayama, Gunma 377-0702 (Japan); Tanaka, M. [Department of Astronomy, School of Science, University of Tokyo, Bunkyo-ku, Tokyo 113-0033 (Japan); Imada, A.; Kuroda, D. [Okayama Astrophysical Observatory, National Astronomical Observatory of Japan, Kamogata, Asakuchi-shi, Okayama 719-0232 (Japan); Maeda, K.; Nomoto, K. [Institute for the Physics and Mathematics of the Universe, University of Tokyo, Kashiwa (Japan); Kamata, Y. [National Astronomical Observatory of Japan, Osawa, Mitaka, Tokyo 181-8588 (Japan); Kawai, N. [Department of Physics, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro-ku, Tokyo 152-8551 (Japan); Konishi, K., E-mail: myamanaka@hiroshima-u.ac.j [Institute for Cosmic Ray Research, University of Tokyo, 5-1-5, Kashiwanoha, Kashiwa, Chiba, 277-8582 (Japan)

2009-12-20T23:59:59.000Z

72

Wrought TiAl Blades  

Science Conference Proceedings (OSTI)

First forged blades have been HPC blades of the Rolls-Royce BR715 engine from Gamma-TAB. The following evolution step was HPC blades for the ...

73

LBNL-4183E-rev1 N NA AT TU UR RA AL L G GA AS S V VA AR RI  

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

4183E-rev1 4183E-rev1 N NA AT TU UR RA AL L G GA AS S V VA AR RI IA AB BI IL LI IT TY Y I IN N C CA AL LI IF FO OR RN NI IA A: : E EN NV VI IR RO ON NM ME EN NT TA AL L I IM MP PA AC CT TS S A AN ND D D DE EV VI IC CE E P PE ER RF FO OR RM MA AN NC CE E E EX XP PE ER RI IM ME EN NT TA AL L E EV VA AL LU UA AT TI IO ON N O OF F I IN NS ST TA AL LL LE ED D C CO OO OK KI IN NG G E EX XH HA AU US ST T F FA AN N P PE ER RF FO OR RM MA AN NC CE E Brett C. Singer, William W. Delp and Michael G. Apte Indoor Environment Department Atmospheric Sciences Department Environmental Energy Technologies Division July 2011 (Revised February 2012) Disclaimer 1 This document was prepared as an account of work sponsored by the United States Government. While this document is believed to contain correct information, neither the United States Government nor any agency thereof, nor The Regents of the University of California, nor any of

74

Metal versus rare-gas ion irradiation during Ti{sub 1-x}Al{sub x}N film growth by hybrid high power pulsed magnetron/dc magnetron co-sputtering using synchronized pulsed substrate bias  

Science Conference Proceedings (OSTI)

Metastable NaCl-structure Ti{sub 1-x}Al{sub x}N is employed as a model system to probe the effects of metal versus rare-gas ion irradiation during film growth using reactive high-power pulsed magnetron sputtering (HIPIMS) of Al and dc magnetron sputtering of Ti. The alloy film composition is chosen to be x = 0.61, near the kinetic solubility limit at the growth temperature of 500 Degree-Sign C. Three sets of experiments are carried out: a -60 V substrate bias is applied either continuously, in synchronous with the full HIPIMS pulse, or in synchronous only with the metal-rich-plasma portion of the HIPIMS pulse. Alloy films grown under continuous dc bias exhibit a thickness-invariant small-grain, two-phase nanostructure (wurtzite AlN and cubic Ti{sub 1-x}Al{sub x}N) with random orientation, due primarily to intense Ar{sup +} irradiation leading to Ar incorporation (0.2 at. %), high compressive stress (-4.6 GPa), and material loss by resputtering. Synchronizing the bias with the full HIPIMS pulse results in films that exhibit much lower stress levels (-1.8 GPa) with no measureable Ar incorporation, larger grains elongated in the growth direction, a very small volume fraction of wurtzite AlN, and random orientation. By synchronizing the bias with the metal-plasma phase of the HIPIMS pulses, energetic Ar{sup +} ion bombardment is greatly reduced in favor of irradiation predominantly by Al{sup +} ions. The resulting films are single phase with a dense competitive columnar structure, strong 111 orientation, no measureable trapped Ar concentration, and even lower stress (-0.9 GPa). Thus, switching from Ar{sup +} to Al{sup +} bombardment, while maintaining the same integrated incident ion/metal ratio, eliminates phase separation, minimizes renucleation during growth, and reduces the high concentration of residual point defects, which give rise to compressive stress.

Greczynski, Grzegorz; Lu Jun; Jensen, Jens; Petrov, Ivan; Greene, Joseph E.; Bolz, Stephan; Koelker, Werner; Schiffers, Christoph; Lemmer, Oliver; Hultman, Lars [Department of Physics (IFM), Linkoeping University, SE-581 83 Linkoeping (Sweden); Department of Physics (IFM), Linkoeping University, SE-581 83 Linkoeping (Sweden) and Materials Science Department and Frederick Seitz Materials Research Laboratory, University of Illinois, Urbana, Illinois 61801 (United States); Department of Physics (IFM), Linkoeping University, SE-581 83 Linkoeping (Sweden); Materials Science Department and Frederick Seitz Materials Research Laboratory, University of Illinois, Urbana, Illinois 61801 (United States) and Department of Physics, University of Illinois, Urbana, Illinois 61801 (United States); CemeCon AG, Adenauerstr. 20 A4, D-52146 Wurselen (Germany); Department of Physics (IFM), Linkoeping University, SE-581 83 Linkoeping (Sweden)

2012-11-15T23:59:59.000Z

75

Category:Des Moines, IA | Open Energy Information  

Open Energy Info (EERE)

IA IA Jump to: navigation, search Go Back to PV Economics By Location Media in category "Des Moines, IA" The following 16 files are in this category, out of 16 total. SVFullServiceRestaurant Des Moines IA MidAmerican Energy Co (Iowa).png SVFullServiceRestauran... 64 KB SVQuickServiceRestaurant Des Moines IA MidAmerican Energy Co (Iowa).png SVQuickServiceRestaura... 64 KB SVHospital Des Moines IA MidAmerican Energy Co (Iowa).png SVHospital Des Moines ... 73 KB SVLargeHotel Des Moines IA MidAmerican Energy Co (Iowa).png SVLargeHotel Des Moine... 72 KB SVLargeOffice Des Moines IA MidAmerican Energy Co (Iowa).png SVLargeOffice Des Moin... 73 KB SVMediumOffice Des Moines IA MidAmerican Energy Co (Iowa).png SVMediumOffice Des Moi... 69 KB SVMidriseApartment Des Moines IA MidAmerican Energy Co (Iowa).png

76

N NE EX XT T G GE EN NE ER RA AT TI IO ON N S SA AF FE EG  

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

NE NE EX XT T G GE EN NE ER RA AT TI IO ON N S SA AF FE EG GU UA AR RD DS S I IN NI IT TI IA AT TI IV VE E ( (N NG GS SI I) ) O OP PP PO OR RT TU UN NI IT TI IE ES S F FO OR R S ST TU UD DE EN NT TS S A AN ND D Y YO OU UN NG G P PR RO OF FE ES SS SI IO ON NA AL LS S I IN NT TE ER RE ES ST TE ED D I IN N S SA AF FE EG GU UA AR RD DS S/ /N NO ON NP PR RO OL LI IF FE ER RA AT TI IO ON N The Next Generation Safeguards Initiative (NGSI) was launched by the National Nuclear Security Administration (NNSA) in FY 2008 to develop the policies, concepts, technologies, expertise, and infrastructure necessary to strengthen and sustain the international safeguards system as it evolves to meet new challenges over the next 25 years. NGSI's Human Capital Development subprogram 1 aims to revitalize and expand the international safeguards human capital base in the United States by attracting, educating, training, and retaining

77

XPS and FTIR study of Ru/Al{sub 2}O{sub 3} and Ru/TiO{sub 2} catalysts: Reduction characteristics and interaction with a methane-oxygen mixture  

SciTech Connect

The oxidation state of alumina- and titania-supported Ru catalysts has been investigated as a function of reduction temperature, as well as by following the interaction with a methane-oxygen mixture at 773 and 973 K, employing XPS and FTIR techniques. It is found that the chemical behavior of Ru depends strongly on the material on which it is supported. Over Al{sub 2}O{sub 3}, ruthenium is incompletely reduced by treatment with hydrogen at 573 and 823 K, while oxidized Ru species are also detected following exposure of the catalyst to a methane-oxygen mixture at 773 and 973 K. In contrast, over TiO{sub 2}, ruthenium is more easily reduced and is stabilized in its reduced state following hydrogen treatment at 823 K. During treatment with the methane-oxygen mixture, no reoxidation of Ru occurs. The interaction between Ru and TiO{sub 2}, which inhibits the oxidation of ruthenium under conditions of partial oxidation of methane, is related to the unique ability of the Ru/TiO{sub 2} catalyst to promote the direct route of synthesis gas formation.

Elmasides, C.; Kondarides, D.I.; Verykios, X.E. [Univ. of Patras (Greece). Dept. of Chemical Engineering; Gruenert, W. [Ruhr-Universitaet Bochum (Germany). Lehrstuhl fuer Technische Chemie

1999-06-24T23:59:59.000Z

78

Coexistence of Magnetic Order and Two-dimensional Superconductivity at LaAlO3/SrTiO3 Interfaces  

E-Print Network (OSTI)

A two dimensional electronic system forms at the interface between the band insulators LaAlO[subscript 3]

Li, Lu

79

DOE - Office of Legacy Management -- Titus Metals - IA 04  

Office of Legacy Management (LM)

from consideration under FUSRAP Also see Documents Related to TITUS METALS IA.04-1 - Argonne National Laboratory Memorandum; Lonergan to Novak; Subject: Extrusion of Billets,...

80

Turbulence-Flame Interactions in Type Ia Supernovae  

E-Print Network (OSTI)

Turbulence-Flame Interactions in Type Ia Supernovae A. J.Normalised time (e) Normalised flame speed Normalised time (length scale (cm) Laminar flame width Gibson scale Cell

Aspden, Andrew J; Lawrence Berkeley National Laboratory, 1 Cyclotron Road, MS 50A-1148, Berkeley, CA 94720 (Authors 1, 2 & 3); Department of Astronomy and Astrophysics, University of California at Santa Cruz, Santa Cruz, CA 95064 (Author 4); Department of Physics and Astronomy, Stony Brook University, Stony Brook, NY 11794 (Author 5)

2008-01-01T23:59:59.000Z

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81

DOE - Office of Legacy Management -- Bendix Aviation Corp Pioneer Div - IA  

Office of Legacy Management (LM)

Bendix Aviation Corp Pioneer Div - Bendix Aviation Corp Pioneer Div - IA 05 FUSRAP Considered Sites Site: BENDIX AVIATION CORP., PIONEER DIV. (IA.05 ) Eliminated from consideration under FUSRAP Designated Name: Not Designated Alternate Name: Pioneer Division, Bendix Aviation Corporation Bendix Aviation Corporation Bendix Pioneer Division IA.05-1 IA.05-2 IA.05-3 Location: Davenport , Iowa IA.05-1 Evaluation Year: 1990 IA.05-2 IA.05-4 Site Operations: Conducted studies to investigate the feasibility of using sonic cleaning equipment to decontaminate uranium contaminated drums. IA.05-1 Site Disposition: Eliminated - Potential for contamination considered remote based on limited operations at the site IA.05-2 IA.05-4 IA.05-5 Radioactive Materials Handled: Yes Primary Radioactive Materials Handled: Uranium IA.05-1

82

Conformal cosmological model and SNe Ia data  

SciTech Connect

Now there is a huge scientific activity in astrophysical studies and cosmological ones in particular. Cosmology transforms from a pure theoretical branch of science into an observational one. All the cosmological models have to pass observational tests. The supernovae type Ia (SNe Ia) test is among the most important ones. If one applies the test to determine parameters of the standard Friedmann-Robertson-Walker cosmological model one can conclude that observations lead to the discovery of the dominance of the {Lambda} term and as a result to an acceleration of the Universe. However, there are big mysteries connected with an origin and an essence of dark matter (DM) and the {Lambda} term or dark energy (DE). Alternative theories of gravitation are treated as a possible solution of DM and DE puzzles. The conformal cosmological approach is one of possible alternatives to the standard {Lambda}CDM model. As it was noted several years ago, in the framework of the conformal cosmological approach an introduction of a rigid matter can explain observational data without {Lambda} term (or dark energy). We confirm the claim with much larger set of observational data.

Zakharov, A. F., E-mail: zakharov@itep.ru [National Astronomical Observatories of Chinese Academy of Sciences (China); Pervushin, V. N. [Joint Institute for Nuclear Research, Bogoliubov Laboratory for Theoretical Physics (Russian Federation)

2012-11-15T23:59:59.000Z

83

The Distant Type Ia Supernova Rate  

DOE R&D Accomplishments (OSTI)

We present a measurement of the rate of distant Type Ia supernovae derived using 4 large subsets of data from the Supernova Cosmology Project. Within this fiducial sample, which surveyed about 12 square degrees, thirty-eight supernovae were detected at redshifts 0.25--0.85. In a spatially flat cosmological model consistent with the results obtained by the Supernova Cosmology Project, we derive a rest-frame Type Ia supernova rate at a mean red shift z {approx_equal} 0.55 of 1.53 {sub -0.25}{sub -0.31}{sup 0.28}{sup 0.32} x 10{sup -4} h{sup 3} Mpc{sup -3} yr{sup -1} or 0.58{sub -0.09}{sub -0.09}{sup +0.10}{sup +0.10} h{sup 2} SNu(1 SNu = 1 supernova per century per 10{sup 10} L{sub B}sun), where the first uncertainty is statistical and the second includes systematic effects. The dependence of the rate on the assumed cosmological parameters is studied and the redshift dependence of the rate per unit comoving volume is contrasted with local estimates in the context of possible cosmic star formation histories and progenitor models.

Pain, R.; Fabbro, S.; Sullivan, M.; Ellis, R. S.; Aldering, G.; Astier, P.; Deustua, S. E.; Fruchter, A. S.; Goldhaber, G.; Goobar, A.; Groom, D. E.; Hardin, D.; Hook, I. M.; Howell, D. A.; Irwin, M. J.; Kim, A. G.; Kim, M. Y.; Knop, R. A.; Lee, J. C.; Perlmutter, S.; Ruiz-Lapuente, P.; Schahmaneche, K.; Schaefer, B.; Walton, N. A.

2002-05-28T23:59:59.000Z

84

Constraining the spin-down timescale of the white-dwarf progenitors of Type Ia supernovae  

E-Print Network (OSTI)

Justham (2011) and DiStefano et al.\\ (2011) proposed that the white-dwarf progenitor of a Type Ia supernova (SN Ia) may have to spin down before it can explode. As the white dwarf spin-down timescale is not well known theoretically, we here try to constrain it empirically (within the framework of this spin-down model) for progenitor systems that contain a giant donor and for which circumbinary material has been detected after the explosion: we obtain an upper limit of a few $10^{\\rm 7} {\\rm yr}$. Based on the study of Di Stefano & Kilic (2012) this means that it is too early to rule out the existence of a surviving companion in SNR 0509-67.5.

Meng, Xiangcun

2013-01-01T23:59:59.000Z

85

Burning Thermals in Type Ia Supernovae A. J. Aspden1  

E-Print Network (OSTI)

Burning Thermals in Type Ia Supernovae A. J. Aspden1 , J. B. Bell1 , S. Dong2 , and S. E. Woosley2 ABSTRACT We develop a one-dimensional theoretical model for thermals burning in Type Ia supernovae based for the burning and for the expansion of the thermal due to changes in the background stratification found

Bell, John B.

86

Al-Zr (Aluminum - Zirconium)  

Science Conference Proceedings (OSTI)

Al-Zr crystallographic data...6 3 / mcm ZrAl 22.8 oC 8 Cmcm Zr 2 Al 3 31 oF 40 Fdd 2 ZrAl 2 37.2 hP 12 P 6 3 / mmc ZrAl 3 47 tI 16 I 4/ mmm (Al) 99.86 to 100 cF 4 Fm m...

87

Visualizing Type Ia Supernova Explosions at NERSC  

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

Supernova Explosions Supernova Explosions Visualizing Type Ia Supernova Explosions Childs1a-Supernovasm.png Deep inside a dying star in a galaxy far, far away, a carbon fusion flame ignites. Ignition may happen in the middle or displaced slightly to one side, but this simulation explores the consequences of central ignition. In a localized hot spot, represented here by a deformed sphere with an average radius of 100 km, carbon is assumed to have already fused to iron, producing hot ash (~10 billion K) with a density about 20% less than its surroundings. As the burning progresses, this hot buoyant ash rises up and interacts with cold fuel. Rayleigh-Taylor fingers give rise to shear and turbulence, which interacts with the flame, causing it to move faster. In about 2 seconds, the energy released blows the entire white dwarf star up,

88

Constant-amplitude fatigue-life data for notched and unnotched annealed ti-6al-4v sheet. Final report, January 1983-September 1986  

Science Conference Proceedings (OSTI)

Three lots of annealed Ti-6A1-4V sheet material in thicknesses of 0.063, 0.070, and 0.078 inch, supplied by two manufacturers, were tested to develop fatigue life curves for MIL-HDBK-5. Notched (Kt=3.0) and unnotched configurations of longitudinal and transverse specimens were tested at R ratios of +0.5, +0.1, and -0.5. Fatigue-life data are presented in both tabular and graphical forms. Results are presented in both tabular and graphical forms. Results were forwarded to the Battelle Memorial Institute, Columbus, Ohio, for analysis, reduction, and inclusion in MIL-HDBK-5.

Rhode, T.M.; Ertel, P.W.

1988-01-01T23:59:59.000Z

89

Structure and Electrochemistry of LiNi1/3Co1/3-yMyMn1/3O2 (M=Ti, Al, Fe) Positive Electrode Materials  

SciTech Connect

A series of materials based on the LiNi1/3Co1/3-yMyMn1/3O2 (M = Ti,Al,Fe) system has been synthesized and examined structurally and electrochemically. It is found that the changes in electrochemical performance depend highly on the nature of the substituting atom and its effect on the crystal structure. Substitution with small amounts of Ti4+ (y = 1/12) leads to the formation of a high-capacity and high-rate positive electrode material. Iron substituted materials suffer from an increased antisite defect concentration and exhibit lower capacities and poor rate capabilities. Single-phase materials are found for LiNi1/3Co1/3-yAlyMn1/3O2 when y<_ 1/4 and all exhibit decreased capacities when cycled to 4.3 V. However, an increase in rate performance and cycle stability upon aluminum substitution is correlated with an improved lamellar structure.

Wilcox, James; Patoux, Sebastien; Doeff, Marca

2009-01-14T23:59:59.000Z

90

DOE - Office of Legacy Management -- Iowa Army Ammunition Plant - IA 02  

Office of Legacy Management (LM)

Army Ammunition Plant - IA 02 Army Ammunition Plant - IA 02 FUSRAP Considered Sites Iowa Army Ammunition Plant, IA Alternate Name(s): Burlington Ordnance Plant Iowa Ordnance Plant Silas Mason Company IA.02-3 Location: Located in Township 70 North, Range 3 West, Section 32, 5th Principal Meridian, Des Moines County, Burlington, Iowa IA.02-1 IA.02-5 Historical Operations: Assembled nuclear weapons, primarily high explosive components and conducted explosives testing using the high explosive components and depleted uranium. AEC and ERDA operations conducted under permit from the Department of the Army. IA.02-3 IA.02-4 Eligibility Determination: Eligible IA.02-5 Radiological Survey(s): Assessment Survey IA.02-2 Site Status: Cleanup pending by U.S. Army Corps of Engineers. IA.02-6

91

Late Light Curves of Normally-Luminous Type Ia Supernovae  

E-Print Network (OSTI)

The use of Type Ia supernovae as cosmological tools has reinforced the need to better understand these objects and their light curves. The light curves of Type Ia supernovae are powered by the nuclear decay of $^{56}Ni \\to ^{56}Co \\to ^{56}Fe$. The late time light curves can provide insight into the behavior of the decay products and their effect of the shape of the curves. We present the optical light curves of six "normal" Type Ia supernovae, obtained at late times with template image subtraction, and the fits of these light curves to supernova energy deposition models.

J. C. Lair; M. D. Leising; P. A. Milne; G. G. Williams

2006-01-05T23:59:59.000Z

92

UMore Ph IA CR Report 7-8-10.pdf  

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

PHASE IA ARCHAEOLOGICAL AND PHASE IA ARCHAEOLOGICAL AND ARCHITECTURAL HISTORY SURVEY FOR THE UMORE PARK RESEARCH WIND TURBINE PROJECT, DAKOTA COUNTY, MINNESOTA SHPO File No. Pending Client No. Pending The 106 Group Project No. 10-18 Submitted to: Barr Engineering Company 4700 West 77th Street Minneapolis, MN 55435-4803 Submitted by: The 106 Group Ltd. The Dacotah Building 370 Selby Avenue St. Paul, MN 55102 Principal Investigators: AnneKetz, M.A., RPA Greg Mathis, M.C.R.P. Report Authors: Mark Doperalski, B.S. Miranda Van Vleet, M.H.P July 2010 UMore Park Wind Turbine Project Phase IA Archaeological and Architectural History Survey Page i MANAGEMENT SUMMARY During May of 2010, The 106 Group Ltd. (106 Group) conducted a Phase IA archaeological and architectural history survey for the University of Minnesota Outreach, Research, and

93

NJ WY AK AL CA AR CO CT DE FL GA HI ID KS IL IN IA IA KY LA  

Gasoline and Diesel Fuel Update (EIA)

accomplishments accomplishments are impressive in themselves, and associ- ated with each milestone is the expansion of future produc- tion opportunities as another technical barrier is overcome. The extension of recovery opportunities into deep water has established the deep offshore as an area of considerable national significance. A second source of increased supply is gas from coalbed formations. Natural gas production from coalbed methane fields continued to grow in 1996 as projects initiated mainly in the early to mid 1990's matured through the dewatering phase into higher rates of gas production. Coalbed forma- tions contribute almost 1 trillion cubic feet, roughly 5 per- cent, to total U.S. production. Continued production growth from coalbeds is not likely in light of the precipitous drop in new wells completed in coalbed formations since the termination of the production tax

94

NJ WY AK AL CA AR CO CT DE FL GA HI ID KS IL IN IA IA KY LA  

Annual Energy Outlook 2012 (EIA)

857, "Monthly Report of Natural Gas Purchases and Deliveries to Consumers." 0.00-1.99 2.00-2.99 3.00-3.99 4.00-4.99 5.00-5.99 6.00-6.99 7.00+ 15. Average City Gate Price of Natural...

95

TYPE Ia SUPERNOVAE STRONGLY INTERACTING WITH THEIR CIRCUMSTELLAR MEDIUM  

SciTech Connect

Owing to their utility for measurements of cosmic acceleration, Type Ia supernovae (SNe Ia) are perhaps the best-studied class of SNe, yet the progenitor systems of these explosions largely remain a mystery. A rare subclass of SNe Ia shows evidence of strong interaction with their circumstellar medium (CSM), and in particular, a hydrogen-rich CSM; we refer to them as SNe Ia-CSM. In the first systematic search for such systems, we have identified 16 SNe Ia-CSM, and here we present new spectra of 13 of them. Six SNe Ia-CSM have been well studied previously, three were previously known but are analyzed in depth for the first time here, and seven are new discoveries from the Palomar Transient Factory. The spectra of all SNe Ia-CSM are dominated by H{alpha} emission (with widths of {approx}2000 km s{sup -1}) and exhibit large H{alpha}/H{beta} intensity ratios (perhaps due to collisional excitation of hydrogen via the SN ejecta overtaking slower-moving CSM shells); moreover, they have an almost complete lack of He I emission. They also show possible evidence of dust formation through a decrease in the red wing of H{alpha} 75-100 days past maximum brightness, and nearly all SNe Ia-CSM exhibit strong Na I D absorption from the host galaxy. The absolute magnitudes (uncorrected for host-galaxy extinction) of SNe Ia-CSM are found to be -21.3 mag {<=} M{sub R} {<=} -19 mag, and they also seem to show ultraviolet emission at early times and strong infrared emission at late times (but no detected radio or X-ray emission). Finally, the host galaxies of SNe Ia-CSM are all late-type spirals similar to the Milky Way, or dwarf irregulars like the Large Magellanic Cloud, which implies that these objects come from a relatively young stellar population. This work represents the most detailed analysis of the SN Ia-CSM class to date.

Silverman, Jeffrey M. [Department of Astronomy, University of Texas, Austin, TX 78712-0259 (United States); Nugent, Peter E. [Lawrence Berkeley National Laboratory, Berkeley, CA 94720 (United States); Gal-Yam, Avishay; Arcavi, Iair; Ben-Ami, Sagi [Benoziyo Center for Astrophysics, Weizmann Institute of Science, Rehovot 76100 (Israel); Sullivan, Mark [School of Physics and Astronomy, University of Southampton, Southampton SO17 1BJ (United Kingdom); Howell, D. Andrew; Graham, Melissa L. [Las Cumbres Observatory Global Telescope Network, Goleta, CA 93117 (United States); Filippenko, Alexei V.; Bloom, Joshua S.; Cenko, S. Bradley; Clubb, Kelsey I. [Department of Astronomy, University of California, Berkeley, CA 94720-3411 (United States); Cao, Yi; Horesh, Assaf; Kulkarni, Shrinivas R. [Cahill Center for Astrophysics, California Institute of Technology, Pasadena, CA 91125 (United States); Chornock, Ryan; Foley, Ryan J. [Harvard-Smithsonian Center for Astrophysics, Cambridge, MA 02138 (United States); Coil, Alison L. [Department of Physics, University of California, San Diego, La Jolla, CA 92093 (United States); Griffith, Christopher V. [Department of Astronomy and Astrophysics, The Pennsylvania State University, University Park, PA 16802 (United States); Kasliwal, Mansi M., E-mail: jsilverman@astro.as.utexas.edu [Observatories of the Carnegie Institution of Science, Pasadena, CA 91101 (United States); and others

2013-07-01T23:59:59.000Z

96

Direct Analysis of Spectra of the Peculiar Type Ia Supernova 2000cx  

E-Print Network (OSTI)

The Type Ia SN 2000cx exhibited multiple peculiarities, including a lopsided B-band light-curve peak that does not conform to current methods for using shapes of light curves to standardize SN Ia luminosities. We use the parameterized supernova synthetic-spectrum code SYNOW to study line identifications in the photospheric-phase spectra of SN 2000cx. Previous work established the presence of Ca II infrared-triplet features forming above velocity about 20,000 km/s, much higher than the photospheric velocity of about 10,000 km/s. We find Ti II features forming at the same high velocity. High-velocity line formation is partly responsible for the photometric peculiarities of SN 2000cx: for example, B-band flux blocking by Ti II absorption features that decreases with time causes the B light curve to rise more rapidly and decline more slowly than it otherwise would. SN 2000cx contains an absorption feature near 4530 A that may be H-beta, forming at the same high velocity. The lack of conspicuous H-alpha and P-alpha signatures does not necessarily invalidate the H-beta identification if the high-velocity line formation is confined to a clump that partly covers the photosphere and the H-alpha and P-alpha source functions are elevated relative to that of resonance scattering. The H-beta identification is tentative. If it is correct, the high-velocity matter must have come from a nondegenerate companion star.

D. Branch; R. C. Thomas; E. Baron; D. Kasen; K. Hatano; K. Nomoto; A. V. Filippenko; W. Li; R. J. Rudy

2004-01-15T23:59:59.000Z

97

VELOCITY EVOLUTION AND THE INTRINSIC COLOR OF TYPE Ia SUPERNOVAE  

SciTech Connect

To understand how best to use observations of Type Ia supernovae (SNe Ia) to obtain precise and accurate distances, we investigate the relations between spectra of SNe Ia and their intrinsic colors. Using a sample of 1630 optical spectra of 255 SNe, based primarily on data from the CfA Supernova Program, we examine how the velocity evolution and line strengths of Si II {lambda}6355 and Ca II H and K are related to the B - V color at peak brightness. We find that the maximum-light velocity of Si II {lambda}6355 and Ca II H and K and the maximum-light pseudo-equivalent width of Si II {lambda}6355 are correlated with intrinsic color, with intrinsic color having a linear relation with the Si II {lambda}6355 measurements. Ca II H and K does not have a linear relation with intrinsic color, but lower-velocity SNe tend to be intrinsically bluer. Combining the spectroscopic measurements does not improve intrinsic color inference. The intrinsic color scatter is larger for higher-velocity SNe Ia-even after removing a linear trend with velocity-indicating that lower-velocity SNe Ia are more 'standard crayons'. Employing information derived from SN Ia spectra has the potential to improve the measurements of extragalactic distances and the cosmological properties inferred from them.

Foley, Ryan J.; Sanders, Nathan E.; Kirshner, Robert P., E-mail: rfoley@cfa.harvard.edu [Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138 (United States)

2011-12-01T23:59:59.000Z

98

The Rate of Type Ia Supernovae at High Redshift  

E-Print Network (OSTI)

We derive the rates of Type Ia supernovae (SNIa) over a wide range of redshifts using a complete sample from the IfA Deep Survey. This sample of more than 100 SNIa is the largest set ever collected from a single survey, and therefore uniquely powerful for a detailed supernova rate (SNR) calculation. Measurements of the SNR as a function of cosmological time offer a glimpse into the relationship between the star formation rate (SFR) and Type Ia SNR, and may provide evidence for the progenitor pathway. We observe a progressively increasing Type Ia SNR between redshifts z~0.3-0.8. The Type Ia SNR measurements are consistent with a short time delay (t~1 Gyr) with respect to the SFR, indicating a fairly prompt evolution of SNIa progenitor systems. We derive a best-fit value of SFR/SNR 580 h_70^(-2) M_solar/SNIa for the conversion factor between star formation and SNIa rates, as determined for a delay time of t~1 Gyr between the SFR and the Type Ia SNR. More complete measurements of the Type Ia SNR at z>1 are necessary to conclusively determine the SFR--SNR relationship and constrain SNIa evolutionary pathways.

Brian J. Barris; John L. Tonry

2005-09-22T23:59:59.000Z

99

The diversity of Type Ia Supernovae: evidence for systematics?  

E-Print Network (OSTI)

The photometric and spectroscopic properties of 26 well observed Type Ia Supernovae (SNeIa) were analyzed with the aim to explore SNIa diversity. The sample includes (Branch-)normal SNe as well as extreme events like SNe 1991T and 1991bg, while the truly peculiar SNIa, SN2000cx and SN2002cx are not included in our sample . A statistical treatment reveals the existence of three different groups. The first group (FAINT) consists of faint SNeIa similar to SN1991bg, with low expansion velocities and rapid evolution of SiII velocity. A second group consists of ``normal'' SNeIa, also with high temporal velocity gradient (HVG), but with brighter mean absolute magnitude =-19.3 and higher expansion velocities than the FAINT SNe. The third group includes both ``normal'' and SN1991T-like SNeIa: these SNe populate a narrow strip in the SiII velocity evolution plot, with a small velocity gradient (SVG), but have absolute magnitudes similar to HVGs. While the FAINT and HVG SNeIa together seem to define a relation between RSi(II) and Dm15(B), the SVG ones either do not conform with that relation or define a new, looser one. The RSi(II) pre-maximum evolution of HVGs is strikingly different from that of SVGs. The impact of this evidence on the understanding of SNIa diversity, in terms of explosion mechanisms, degree of ejecta mixing, and ejecta-CSM interaction, is discussed.

S. Benetti; E. Cappellaro; P. A. Mazzali; M. Turatto; G. Altavilla; F. Bufano; N. Elias-Rosa; R. Kotak; G. Pignata; M. Salvo; V. Stanishev

2004-11-02T23:59:59.000Z

100

Morphological Evaluation of Osteoblast-TiO2 Nanotube Interfaces  

Science Conference Proceedings (OSTI)

A Comparative Study of the Compressive Mechanical Properties of Young and ... of Ti-6Al-4V for Medical Applications after Surface Modification by Anodization.

Note: This page contains sample records for the topic "ti ia al" 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

Stress Corrosion Cracking Threshold of Ti 6-4 Extrusions  

Science Conference Proceedings (OSTI)

Ti 6Al-4V extrusions with standard chemistry and extra low interstitial are evaluated for their stress corrosion cracking resistance. Also examined is the affect of ...

102

DISTRIBUTED FLAMES IN TYPE Ia SUPERNOVAE  

Science Conference Proceedings (OSTI)

At a density near a few x10{sup 7} g cm{sup -3}, the subsonic burning in a Type Ia supernova (SN) enters the distributed regime (high Karlovitz number). In this regime, turbulence disrupts the internal structure of the flame, and so the idea of laminar burning propagated by conduction is no longer valid. The nature of the burning in this distributed regime depends on the turbulent Damkoehler number (Da{sub T}), which steadily declines from much greater than one to less than one as the density decreases to a few x10{sup 6} g cm{sup -3}. Classical scaling arguments predict that the turbulent flame speed s{sub T} , normalized by the turbulent intensity u-check, follows s{sub T}/u-check = Da{sub T}{sup 1/2} for Da{sub T} {approx}burns as a turbulently broadened effective unity Lewis number flame. This flame burns locally with speed s{sub l}ambda and width l{sub l}ambda, and we refer to this kind of flame as a lambda-flame. The burning becomes a collection of lambda-flames spread over a region approximately the size of the {integral} scale. While the total burning rate continues to have a well-defined average, s{sub T}{approx}u-check, the burning is unsteady. We present a theoretical framework, supported by both one-dimensional and three-dimensional numerical simulations, for the burning in these two regimes. Our results indicate that the average value of s{sub T} can actually be roughly twice u-check for Da{sub T} {approx}> 1, and that localized excursions to as much as 5 times u-check can occur. We also explore the properties of the individual flames, which could be sites for a transition to detonation when Da{sub T} {approx} 1. The lambda-flame speed and width can be predicted based on the turbulence in the star (specifically the energy dissipation rate epsilon*) and the turbulent nuclear burning timescale of the fuel tau {sup T}{sub nuc}. We propose a practical method for measuring s{sub l}ambda and l{sub l}ambda based on the scaling relations and small-scale computationally inexpensive simulations. This suggests that a simple turbulent flame model can be easily constructed suitable for large-scale distributed SNe flames. These results will be useful both for characterizing the deflagration speed in larger full-star simulations, where the flame cannot be resolved, and for predicting when detonation occurs.

Aspden, A. J.; Bell, J. B. [Lawrence Berkeley National Laboratory, 1 Cyclotron Road, MS 50A-1148, Berkeley, CA 94720 (United States); Woosley, S. E. [Department of Astronomy and Astrophysics, University of California at Santa Cruz, Santa Cruz, CA 95064 (United States)

2010-02-20T23:59:59.000Z

103

Redshift-Independent Distances to Type Ia Supernovae  

E-Print Network (OSTI)

We describe a procedure for accurately determining luminosity distances to Type Ia supernovae (SNe Ia) without knowledge of redshift. This procedure, which may be used as an extension of any of the various distance determination methods currently in use, is based on marginalizing over redshift, removing the requirement of knowing $z$ a priori. We demonstrate that the Hubble diagram scatter of distances measured with this technique is approximately equal to that of distances derived from conventional redshift-specific methods for a set of 60 nearby SNe Ia. This indicates that accurate distances for cosmological SNe Ia may be determined without the requirement of spectroscopic redshifts, which are typically the limiting factor for the number of SNe that modern surveys can collect. Removing this limitation would greatly increase the number of SNe for which current and future SN surveys will be able to accurately measure distance. The method may also be able to be used for high-$z$ SNe Ia to determine cosmological density parameters without redshift information.

Brian J. Barris; John L. Tonry

2004-08-04T23:59:59.000Z

104

Constraints on SN Ia progenitor time delays from high-z SNe and the star formation history  

E-Print Network (OSTI)

We re-assess the question of a systematic time delay between the formation of the progenitor and its explosion in a type Ia supernova (SN Ia) using the Hubble Higher-z Supernova Search sample (Strolger et al. 2004). While the previous analysis indicated a significant time delay, with a most likely value of 3.4 Gyr, effectively ruling out all previously proposed progenitor models, our analysis shows that the time-delay estimate is dominated by systematic errors, in particular due to uncertainties in the star-formation history. We find that none of the popular progenitor models under consideration can be ruled out with any significant degree of confidence. The inferred time delay is mainly determined by the peak in the assumed star-formation history. We show that, even with a much larger Supernova sample, the time delay distribution cannot be reliably reconstructed without better constraints on the star-formation history.

F. Förster; C. Wolf; Ph. Podsiadlowski; Z. Han

2006-01-19T23:59:59.000Z

105

Comportamento eletroquímico do Ti Grau 2 e da liga Ti6A14V em tampões citrato e tampões MCLL Vaine contendo haletos.  

E-Print Network (OSTI)

??Estudou-se o comportamento eletroquímico do Ti grau 2 e da liga Ti6Al4V em tampões citrato e tampões Mcll Vaine, na presença de haletos, em uma… (more)

Anelise Marlene Schmidt

2003-01-01T23:59:59.000Z

106

The type Ia supernova SNLS-03D3bb from a super-Chandrasekhar-mass white dwarf star  

E-Print Network (OSTI)

The absolute magnitudes of Type IA supernovae. Astrophys. J.in a Sublu- o minous Type Ia Supernova: SpectropolarimetryL. Could There Be a Hole in Type Ia Super- novae? Astrophys.

2008-01-01T23:59:59.000Z

107

Nucleosynthesis in type Ia supernovae driven by asymmetric thermonuclear ignition  

Science Conference Proceedings (OSTI)

Type Ia Supernovae (SNe Ia) are believed to be thermonuclear explosions of a white dwarf. They can be used as mature cosmological standardized candles, leading to the discovery of the accelerating expansion of the Universe. However, the explosion mechanism has not yet been fully clarified. In this paper, we first present nucleosynthetic features of a leading explosion scenario, namely a delayed-detonation scenario. Based on this, we propose a new and strong observational constraint on the explosion mechanism through emission lines from neutron-rich Fe-peaks. Especially, we show that an asymmetry in the explosion is likely a generic feature. We further argue that the diversity arising from various viewing angles can be an origin of observational diversities of SNe Ia seen in their spectral features (suspected possible biases in cosmology) and colors (related to the extinction estimate in cosmology). Using these new insights could open up a possibility of using SNe Ia as more precise distance indicators than currently employed.

Maeda, Keiichi [Institute for the Physics and Mathematics of the Universe (IPMU), Todai Institutes for Advanced Study (TODIAS), University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8583 (Japan)

2012-11-12T23:59:59.000Z

108

Ti Plasmid  

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

Ti Plasmid Ti Plasmid Name: Dixenia Location: N/A Country: N/A Date: N/A Question: What can you tell me about the Ti Plasmid? Replies: This plasmid is named for a plasmid found in a bacteria called Agrobacter tumefaciens. It causes "plant cancer" or what are known as galls. They are little tumors in which the bacteria can grow and live in the plant. Ti stands for tumor inducing. The bacterium gets into the plant through some kind of wound, ie. a scratch. It injects its plasmid into a plant cell and the plasmid inserts its DNA into the plant's DNA. Then the DNA directs the plant to make a hollow tumor where the bacteria can live. Scientists have taken advantage of this plant's ability to insert foreign DNA into a plant. They take the genes out of the plasmid that cause galls, and insert genes of interest, ie. genes for pest resistance and let the plasmid carry those genes into the plant. The plant will start making the product you want. You may have seen a picture of a tobacco plant glowing because firefly genes for glowing were inserted into the plant. They did this so they could know if the gene had made it into the plant. Once they are sure the gene they want has made it into the plant, they clone the plant cells. By the way, plant tissue culture is a procedure that is very common and has been done for years, this is not the same as cloning animals.

109

Optical Spectra of Type Ia Supernovae at z=0.46 and z=1.2  

E-Print Network (OSTI)

We present optical spectra, obtained with the Keck 10-m telescope, of two high-redshift type Ia supernovae (SNe Ia) discovered by the High-z Supernova Search Team: SN 1999ff at z=0.455 and SN 1999fv at z~1.2, the highest-redshift published SN Ia spectrum. Both SNe were at maximum light when the spectra were taken. We compare our high-z spectra with low-z normal and peculiar SNe Ia as well as with SNe Ic, Ib, and II. There are no significant differences between SN 1999ff and normal SNe Ia at low redshift. SN 1999fv appears to be a SN Ia and does not resemble the most peculiar nearby SNe Ia.

Coil, A L; Filippenko, A V; Leonard, D C; Tonry, J; Riess, A G; Challis, P M; Clocchiatti, A; Garnavich, P M; Hogan, C J; Jha, S; Kirshner, R P; Leibundgut, B; Phillips, M M; Schmidt, B P; Schommer, R A; Smith, R C; Soderberg, A M; Spyromilio, J; Stubbs, C; Suntzeff, N B; Woudt, P A; Coil, Alison L.; Matheson, Thomas; Filippenko, Alexei V.; Leonard, Douglas C.; Tonry, John; Riess, Adam G.; Challis, Peter; Clocchiatti, Alejandro; Garnavich, Peter M.; Hogan, Craig J.; Jha, Saurabh; Kirshner, Robert P.; Schmidt, Brian P.; Schommer, Robert A.; Soderberg, Alicia M.; Stubbs, Christopher; Suntzeff, Nicholas B.; Woudt, Patrick

2000-01-01T23:59:59.000Z

110

Progenitors of type Ia supernovae in elliptical galaxies  

Science Conference Proceedings (OSTI)

Although there is a nearly universal agreement that type Ia supernovae are associated with the thermonuclear disruption of a CO white dwarf, the exact nature of their progenitors is still unknown. The single degenerate scenario envisages a white dwarf accreting matter from a non-degenerate companion in a binary system. Nuclear energy of the accreted matter is released in the form of electromagnetic radiation or gives rise to numerous classical nova explosions prior to the supernova event. We show that combined X-ray output of supernova progenitors and statistics of classical novae predicted in the single degenerate scenario are inconsistent with X-ray and optical observations of nearby early type galaxies and galaxy bulges. White dwarfs accreting from a donor star in a binary system and detonating at the Chandrasekhar mass limit can account for no more than {approx}5% of type Ia supernovae observed in old stellar populations.

Gilfanov, M.; Bogdan, A.

2011-09-21T23:59:59.000Z

111

Learning from the scatter in type ia supernovae  

SciTech Connect

Type Ia Supernovae are standard candles so their mean apparent magnitude has been exploited to learn about the redshift-distance relationship. Besides intrinsic scatter in this standard candle, additional scatter is caused by gravitational magnification by large scale structure. Here they probe the dependence of this dispersion on cosmological parameters and show that information about the amplitude of clustering, {sigma}{sub s}, is contained in the scatter. In principle, it will be possible to constrain {sigma}{sub s} to within 5% with observations of 2000 Type Ia Supernovae. They identify three sources of systematic error--evolution of intrinsic scatter, baryon contributions to lensing, and non-Gaussianity of lensing--which will make this measurement difficult.

Dodelson, Scott; /Fermilab /Chicago U., Astron. Astrophys. Ctr.; Vallinotto, Alberto; /Fermilab /Chicago U.

2005-11-01T23:59:59.000Z

112

Type Ia Supernova Spectral Line Ratios as LuminosityIndicators  

SciTech Connect

Type Ia supernovae have played a crucial role in thediscovery of the dark energy, via the measurement of their light curvesand the determination of the peak brightness via fitting templates to theobserved lightcurve shape. Two spectroscopic indicators are also known tobe well correlated with peak luminosity. Since the spectroscopicluminosity indicators are obtained directly from observed spectra, theywill have different systematic errors than do measurements usingphotometry. Additionally, these spectroscopic indicators may be usefulfor studies of effects of evolution or age of the SNe~;Ia progenitorpopulation. We present several new variants of such spectroscopicindicators which are easy to automate and which minimize the effects ofnoise. We show that these spectroscopic indicators can be measured byproposed JDEM missions such as snap and JEDI.

Bongard, Sebastien; Baron, E.; Smadja, G.; Branch, David; Hauschildt, Peter H.

2005-12-07T23:59:59.000Z

113

Investigating the Flame Microstructure in Type Ia Supernovae  

E-Print Network (OSTI)

We present a numerical model to study the behavior of thermonuclear flames in the discontinuity approximation. This model is applied to investigate the Landau-Darrieus instability under conditions found in Type Ia supernova explosions of Chandrasekhar mass white dwarfs. This is a first step to explore the flame microstructure in these events. The model reproduces Landau's linearized stability analysis in early stages of the flame evolution and the stabilization in a cellular flame structure in the nonlinear stage.

F. K. Roepke; W. Hillebrandt; J. C. Niemeyer

2002-04-02T23:59:59.000Z

114

Reflections on Reflexions: I. Light Echoes in Type Ia Supernovae  

E-Print Network (OSTI)

In the last ten years, observational evidences about a possible connection between Type Ia Supernovae (SNe) properties and the environment where they explode have been steadily growing. In this paper I discuss, from a theoretical point of view but with an observer's perspective, the usage of light echoes (LEs) to probe the CSM around SNe of Type Ia since, in principle, they give us a unique opportunity of getting a three-dimensional description of the SN environment. In turn, this can be used to check the often suggested association of some Ia's with dusty/star forming regions, which would point to a young population for the progenitors. After giving a brief introduction to the LE phenomenon in single scattering approximation, I derive analytical and numerical solutions for the optical light and colour curves for a few simple dust geometries. A fully 3D multiple scattering treatment has also been implemented in a Monte Carlo code, which I have used to investigate the effects of multiple scattering. In particu...

Patat, F

2004-01-01T23:59:59.000Z

115

LAX XXlCfl jX?iK, Idd+?KYLViG?IA  

Office of Legacy Management (LM)

f f , : I~&l, samtier cipwati8Aa CffUm - . Jiux.lCJ d,# 1754 - - _- - .- t :; . Jesse e. ahizmn*~*ter -2.' -------- - _ &tV' hi@A l f izau Bkteriala ;' . . 1 -7 I _' i' . Fpr&G& r&Q Q,&& fu &fI& L;&& -l&d 2;,i' iI,;/Qi' rIGN CQ&GgJy p;E& p;~p>gyf LAX XXlCfl jX?iK, Idd+?KYLViG?IA i-icfer~~o is &o ta yaw rwarandu3;: l P iimwmbec L?, 1953, reque&in~ a d&q.&ti of khority tA A&sister prog= for th+zz developmrrrl, Ii-&k& & acyui8itti ef c;uYletit*type and reswitlitc-type urtim bi:aPing eres and far t3-u jx*uctim and acquisitian 6f W ;aniU CCm- csa:ratc~ fhzi awes wit2n Lhe Six&e of Pemlsyzvania. 1 da not b&i- the projscrt fmr the pkcch2670 +S eroa from i&d.&

116

THE SDSS-II SUPERNOVA SURVEY: PARAMETERIZING THE TYPE Ia SUPERNOVA RATE AS A FUNCTION OF HOST GALAXY PROPERTIES  

Science Conference Proceedings (OSTI)

Using data from the Sloan Digital Sky Supernova Survey-II (SDSS-II SN Survey), we measure the rate of Type Ia supernovae (SNe Ia) as a function of galaxy properties at intermediate redshift. A sample of 342 SNe Ia with 0.05 0.15) SNe Ia in highly star-forming galaxies. We consider that the high levels of dust in these systems may be obscuring the reddest and faintest SNe Ia.

Smith, Mathew [Department of Physics, University of Western Cape, Bellville 7530, Cape Town (South Africa); Nichol, Robert C. [Institute of Cosmology and Gravitation, University of Portsmouth, Portsmouth PO1 3FX (United Kingdom); Dilday, Benjamin [Las Cumbres Observatory Global Telescope Network, 6740 Cortona Dr., Suite 102, Goleta, CA 93117 (United States); Marriner, John; Frieman, Joshua [Center for Particle Astrophysics, Fermilab, P.O. Box 500, Batavia, IL 60510 (United States); Kessler, Richard [Department of Astronomy and Astrophysics, University of Chicago, 5640 S. Ellis Ave, Chicago, IL 60637 (United States); Bassett, Bruce [African Institute for Mathematical Sciences, 6-8 Melrose Road, Muizenberg 7945 (South Africa); Cinabro, David [Department of Physics and Astronomy, Wayne State University, Detroit, MI 48201 (United States); Garnavich, Peter [Department of Physics, University of Notre Dame, 225 Nieuwland Science Hall, Notre Dame, IN 46556 (United States); Jha, Saurabh W. [Department of Physics and Astronomy, Rutgers, State University of New Jersey, 136 Frelinghuysen Road, Piscataway, NJ 08854 (United States); Lampeitl, Hubert [Astrophysics, Cosmology and Gravity Centre (ACGC), Department of Mathematics and Applied Mathematics, University of Cape Town, Rondebosch 7701 (South Africa); Sako, Masao [Physics and Astronomy, University of Pennsylvania, 209 South 33rd Street, Philadelphia, PA 19104 (United States); Schneider, Donald P. [Department of Astronomy and Astrophysics, Pennsylvania State University, 525 Davey Laboratory, University Park, PA 16802 (United States); Sollerman, Jesper, E-mail: matsmith2@gmail.com [Oskar Klein Centre, Department of Astronomy, AlbaNova, Stockholm University, SE-106 91 Stockholm (Sweden)

2012-08-10T23:59:59.000Z

117

LATE-TIME SPECTRAL OBSERVATIONS OF THE STRONGLY INTERACTING TYPE Ia SUPERNOVA PTF11kx  

SciTech Connect

PTF11kx was a Type Ia supernova (SN Ia) that showed time-variable absorption features, including saturated Ca II H and K lines that weakened and eventually went into emission. The strength of the emission component of H{alpha} gradually increased, implying that the SN was undergoing significant interaction with its circumstellar medium (CSM). These features, and many others, were blueshifted slightly and showed a P-Cygni profile, likely indicating that the CSM was directly related to, and probably previously ejected by, the progenitor system itself. These and other observations led Dilday et al. to conclude that PTF11kx came from a symbiotic nova progenitor like RS Oph. In this work we extend the spectral coverage of PTF11kx to 124-680 rest-frame days past maximum brightness. The late-time spectra of PTF11kx are dominated by H{alpha} emission (with widths of full width at half-maximum intensity Almost-Equal-To 2000 km s{sup -1}), strong Ca II emission features ({approx}10,000 km s{sup -1} wide), and a blue 'quasi-continuum' due to many overlapping narrow lines of Fe II. Emission from oxygen, He I, and Balmer lines higher than H{alpha} is weak or completely absent at all epochs, leading to large observed H{alpha}/H{beta} intensity ratios. The H{alpha} emission appears to increase in strength with time for {approx}1 yr, but it subsequently decreases significantly along with the Ca II emission. Our latest spectrum also indicates the possibility of newly formed dust in the system as evidenced by a slight decrease in the red wing of H{alpha}. During the same epochs, multiple narrow emission features from the CSM temporally vary in strength. The weakening of the H{alpha} and Ca II emission at late times is possible evidence that the SN ejecta have overtaken the majority of the CSM and agrees with models of other strongly interacting SNe Ia. The varying narrow emission features, on the other hand, may indicate that the CSM is clumpy or consists of multiple thin shells.

Silverman, Jeffrey M. [Department of Astronomy, University of Texas, Austin, TX 78712-0259 (United States); Nugent, Peter E.; Filippenko, Alexei V.; Cenko, S. Bradley [Department of Astronomy, University of California, Berkeley, CA 94720-3411 (United States); Gal-Yam, Avishay [Benoziyo Center for Astrophysics, The Weizmann Institute of Science, Rehovot 76100 (Israel); Sullivan, Mark [School of Physics and Astronomy, University of Southampton, Southampton SO17 1BJ (United Kingdom); Howell, D. Andrew [Las Cumbres Observatory Global Telescope Network, Goleta, CA 93117 (United States); Pan, Yen-Chen; Hook, Isobel M., E-mail: jsilverman@astro.as.utexas.edu [Department of Physics (Astrophysics), University of Oxford, Keble Road, Oxford OX1 3RH (United Kingdom)

2013-08-01T23:59:59.000Z

118

THE DIFFUSE GAMMA-RAY BACKGROUND FROM TYPE Ia SUPERNOVAE  

SciTech Connect

The origin of the diffuse extragalactic gamma-ray background (EGB) has been intensively studied but remains unsettled. Current popular source candidates include unresolved star-forming galaxies, starburst galaxies, and blazars. In this paper, we calculate the EGB contribution from the interactions of cosmic rays accelerated by Type Ia supernovae (SNe), extending earlier work that only included core-collapse SNe. We consider Type Ia events not only in star-forming galaxies, but also in quiescent galaxies that lack star formation. In the case of star-forming galaxies, consistently including Type Ia events makes little change to the star-forming EGB prediction, so long as both SN types have the same cosmic-ray acceleration efficiencies in star-forming galaxies. Thus, our updated EGB estimate continues to show that star-forming galaxies can represent a substantial portion of the signal measured by Fermi. In the case of quiescent galaxies, conversely, we find a wide range of possibilities for the EGB contribution. The dominant uncertainty we investigated comes from the mass in hot gas in these objects, which provides targets for cosmic rays; total gas masses are as yet poorly known, particularly at larger radii. Additionally, the EGB estimation is very sensitive to the cosmic-ray acceleration efficiency and confinement, especially in quiescent galaxies. In the most optimistic allowed scenarios, quiescent galaxies can be an important source of the EGB. In this case, star-forming galaxies and quiescent galaxies together will dominate the EGB and leave little room for other contributions. If other sources, such as blazars, are found to have important contributions to the EGB, then either the gas mass or cosmic-ray content of quiescent galaxies must be significantly lower than in their star-forming counterparts. In any case, improved Fermi EGB measurements will provide important constraints on hot gas and cosmic rays in quiescent galaxies.

Lien, Amy; Fields, Brian D. [Department of Physics, University of Illinois, Urbana, IL 61801 (United States)

2012-03-10T23:59:59.000Z

119

Reflections on Reflexions: I. Light Echoes in Type Ia Supernovae  

E-Print Network (OSTI)

In the last ten years, observational evidences about a possible connection between Type Ia Supernovae (SNe) properties and the environment where they explode have been steadily growing. In this paper I discuss, from a theoretical point of view but with an observer's perspective, the usage of light echoes (LEs) to probe the CSM around SNe of Type Ia since, in principle, they give us a unique opportunity of getting a three-dimensional description of the SN environment. In turn, this can be used to check the often suggested association of some Ia's with dusty/star forming regions, which would point to a young population for the progenitors. After giving a brief introduction to the LE phenomenon in single scattering approximation, I derive analytical and numerical solutions for the optical light and colour curves for a few simple dust geometries. A fully 3D multiple scattering treatment has also been implemented in a Monte Carlo code, which I have used to investigate the effects of multiple scattering. In particular, I have explored in detail the LE colour dependency from time and dust distribution, since this is a promising tool to determine the dust density and derive the effective presence of multiple scattering from the observed properties. Finally, again by means of Monte Carlo simulations, I have studied the effects of multiple scattering on the LE linear polarization, analyzing the dependencies from the dust parameters and geometry. Both the analytical formalism and MC codes described in this paper can be used for any LE for which the light curve of the central source is known.

F. Patat

2004-09-28T23:59:59.000Z

120

Turbulence-Flame Interactions in Type Ia Supernovae  

SciTech Connect

The large range of time and length scales involved in type Ia supernovae (SN Ia) requires the use of flame models. As a prelude to exploring various options for flame models, we consider, in this paper, high-resolution three-dimensional simulations of the small-scale dynamics of nuclear flames in the supernova environment in which the details of the flame structure are fully resolved. The range of densities examined, 1 to 8 x 107 g cm-3, spans the transition from the laminar flamelet regime to the distributed burning regime where small scale turbulence disrupts the flame. The use of a low Mach number algorithm facilitates the accurate resolution of the thermal structure of the flame and the inviscid turbulent kinetic energy cascade, while implicitly incorporating kinetic energy dissipation at the grid-scale cutoff. For an assumed background of isotropic Kolmogorov turbulence with an energy characteristic of SN Ia, we find a transition density between 1 and 3 x 107 g cm-3 where the nature of the burning changes ualitatively. By 1 x 107 g cm-3, energy diffusion by conduction and radiation is exceeded, on the flame scale, by turbulent advection. As a result, the effective Lewis Number approaches unity. That is, the flame resembles a laminar flame, but is turbulently broadened with an effective diffusion coefficient, D_T \\sim u' l, where u' is the turbulent intensity and l is the integral scale. For the larger integral scales characteristic of a real supernova, the flame structure is predicted to become complex and unsteady. Implications for a possible transition to detonation are discussed.

Lawrence Berkeley National Laboratory, 1 Cyclotron Road, MS 50A-1148, Berkeley, CA 94720 (Authors 1, 2& 3); Department of Astronomy and Astrophysics, University of California at Santa Cruz, Santa Cruz, CA 95064 (Author 4); Department of Physics and Astronomy, Stony Brook University, Stony Brook, NY 11794 (Author 5); Aspden, Andrew J; Aspden, Andrew J.; Bell, John B.; Day, Marc S.; Woosley, Stan E.; Zingale, Mike

2008-05-27T23:59:59.000Z

Note: This page contains sample records for the topic "ti ia al" 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

Turbulence-Flame Interactions in Type Ia Supernovae  

E-Print Network (OSTI)

The large range of time and length scales involved in type Ia supernovae (SN Ia) requires the use of flame models. As a prelude to exploring various options for flame models, we consider, in this paper, high-resolution three-dimensional simulations of the small-scale dynamics of nuclear flames in the supernova environment in which the details of the flame structure are fully resolved. The range of densities examined, 1 to $8 \\times 10^7$ g cm$^{-3}$, spans the transition from the laminar flamelet regime to the distributed burning regime where small scale turbulence disrupts the flame. The use of a low Mach number algorithm facilitates the accurate resolution of the thermal structure of the flame and the inviscid turbulent kinetic energy cascade, while implicitly incorporating kinetic energy dissipation at the grid-scale cutoff. For an assumed background of isotropic Kolmogorov turbulence with an energy characteristic of SN Ia, we find a transition density between 1 and $3 \\times 10^7$ g cm$^{-3}$ where the nature of the burning changes qualitatively. By $1 \\times 10^7$ g cm$^{-3}$, energy diffusion by conduction and radiation is exceeded, on the flame scale, by turbulent advection. As a result, the effective Lewis Number approaches unity. That is, the flame resembles a laminar flame, but is turbulently broadened with an effective diffusion coefficient, $D_T \\sim u' l$, where $u'$ is the turbulent intensity and $l$ is the integral scale. For the larger integral scales characteristic of a real supernova, the flame structure is predicted to become complex and unsteady. Implications for a possible transition to detonation are discussed.

A. J. Aspden; J. B. Bell; M. S. Day; S. E. Woosley; M. Zingale

2008-11-17T23:59:59.000Z

122

Mathematical Modelling of Welding Process of Al/Al2O3 ...  

Science Conference Proceedings (OSTI)

Direct Numerical Simulation of Inclusion Turbulent Deposition at Liquid ... Flow and Shrinkage Pipe Formation on Macrosegregation of Investment Cast -TiAl Alloys ... Numerical Modeling of the Interaction between a Foreign Particle an ...

123

Impact of TiN post-treatment on metal insulator metal capacitor performances  

Science Conference Proceedings (OSTI)

When deposited by chemical vapor deposition (CVD), TiN layers must be post-treated with N"2/H"2 plasma. Metal-insulator-metal (MIM) capacitors using CVD-TiN as electrodes and Al"2O"3 as insulator are studied from both electrical and physico-chemical ... Keywords: EELS analysis, Electrical characteristics, MIM capacitors, TiN post-treatment

A. Bajolet; J-P. Manceau; S. Bruyère; R. Clerc; M. Proust; N. Gaillard; J-C. Giraudin; P. Delpech; L. Montès; G. Ghibaudo

2006-11-01T23:59:59.000Z

124

ALS Spectrum  

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

ALS Spectrum Print Begun in 2007, ALS Spectrum is a publication that encapsulates the same type of information contained in the ALS Activity Report but in a short, readable,...

125

ALS Spectrum  

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

Spectrum Print Begun in 2007, ALS Spectrum is a publication that encapsulates the same type of information contained in the ALS Activity Report but in a short, readable,...

126

Microsoft PowerPoint - IEEE IAS PES 102313.pptx  

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

DOE's ARRA DOE's ARRA Smart Grid Program Steve Bossart, Senior Energy Analyst IEEE IAS/PES Pittsburgh Section October 23, 2013 ‹#› Topics * OE ARRA Smart Grid Program * OE ARRA Smart Grid Progress * Results and Case Studies * Life After ARRA Smart Grid ‹#› DOE OE ARRA Smart Grid Program ‹#› American Recovery and Reinvestment Act ($4.5B) * Smart Grid Investment Grants (99 projects) - $3.4 billion Federal; $4.7 billion private sector - > 800 PMUs covering almost 100% of transmission - ~ 8000 distribution automation circuits - > 15 million smart meters * Smart Grid Demonstration Projects (32 projects) - $685 million Federal; $1 billion private sector - 16 storage projects - 16 regional demonstrations Smart Grid ARRA Activities ‹#› Smart Grid investment from ARRA field projects

127

Type Ia Supernova: Burning and Detonation in the Distributed Regime  

E-Print Network (OSTI)

A simple, semi-analytic representation is developed for nuclear burning in Type Ia supernovae in the special case where turbulent eddies completely disrupt the flame. The speed and width of the ``distributed'' flame front are derived. For the conditions considered, the burning front can be considered as a turbulent flame brush composed of corrugated sheets of well-mixed flames. These flames are assumed to have a quasi-steady-state structure similar to the laminar flame structure, but controlled by turbulent diffusion. Detonations cannot appear in the system as long as distributed flames are still quasi-steady-state, but this condition is violated when the distributed flame width becomes comparable to the size of largest turbulent eddies. When this happens, a transition to detonation may occur. For current best estimates of the turbulent energy, the most likely density for the transition to detonation is in the range 0.5 - 1.5 x 10^7 g cm^{-3}.

S. E. Woosley

2007-09-26T23:59:59.000Z

128

Combustion-reacted SiC-AlN Presinter and Pressureless Infiltration ...  

Science Conference Proceedings (OSTI)

Presentation Title, Combustion-reacted SiC-AlN Presinter and Pressureless Infiltration with ... Laser Deposited In Situ TiC Reinforced Nickel Matrix Composites: ...

129

Type Ia Supernovae Rates and Galaxy Clustering from the CFHT Supernova Legacy Survey  

E-Print Network (OSTI)

The Canada-France-Hawaii Telescope Supernova Legacy Survey (SNLS) has created a large homogeneous database of intermediate redshift (0.2 rates, properties, and host galaxy star formation rates. The SNLS SN Ia database has now been combined with a photometric redshift galaxy catalog and an optical galaxy cluster catalog to investigate the possible influence of galaxy clustering on the SN Ia rate, over and above the expected effect due to the dependence of SFR on clustering through the morphology-density relation. We identify three cluster SNe Ia, plus three additional possible cluster SNe Ia, and find the SN Ia rate per unit mass in clusters at intermediate redshifts is consistent with the rate per unit mass in field early-type galaxies and the SN Ia cluster rate from low redshift cluster targeted surveys. We also find the number of SNe Ia in cluster environments to be within a factor of two of expectations from the two component SNIa rate model.

M. L. Graham; C. J. Pritchet; M. Sullivan; S. D. J. Gwyn; J. D. Neill; E. Y. Hsiao; P. Astier; D. Balam; C. Balland; S. Basa; R. G. Carlberg; A. Conley; D. Fouchez; J. Guy; D. Hardin; I. M. Hook; D. A. Howell; R. Pain; K. Perrett; N. Regnault; S. Baumont; J. Le Du; C. Lidman; S. Perlmutter; P. Ripoche; N. Suzuki; E. S. Walker; T. Zhang

2008-01-31T23:59:59.000Z

130

Synthesis of In-situ AlTi2/TiC/AlTi2C Hybrid Nanocomposite Coating ...  

Science Conference Proceedings (OSTI)

The formation of coating during mechanical alloying was the results of repetitive cold welding and fracturing of powder particles with each other and with hard ...

131

Grain Refinement of Al Cast by Al5CuTi2, Al22Fe3Ti8 and ...  

Science Conference Proceedings (OSTI)

... and Welding Conditions of Monopile and Transition for Offshore Wind Plant ... Optimization of a New Polycrystalline Superalloy for Industrial Gas Turbines.

132

Fitting Type Ia supernovae with coupled dark energy  

E-Print Network (OSTI)

We discuss the possible consistency of the recently discovered Type Ia supernovae at z>1 with models in which dark energy is strongly coupled to a significant fraction of dark matter, and in which an (asymptotic) accelerated phase exists where dark matter and dark energy scale in the same way. Such a coupling has been suggested for a possible solution of the coincidence problem, and is also motivated by string cosmology models of "late time" dilaton interactions. Our analysis shows that, for coupled dark energy models, the recent data are still consistent with acceleration starting as early as at $z=3$ (to within 90% c.l.), although at the price of a large "non-universality" of the dark energy coupling to different matter fields. Also, as opposed to uncoupled models which seem to prefer a ``phantom'' dark energy, we find that a large amount of coupled dark matter is compatible with present data only if the dark energy field has a conventional equation of state w>-1.

Amendola, L; Piazza, F; Amendola, Luca; Gasperini, Maurizio; Piazza, Federico

2004-01-01T23:59:59.000Z

133

Métrologie des supernovae de type Ia pour la cosmologie : instrumentation et analyse calorimétrique.  

E-Print Network (OSTI)

??L'utilisation des supernovae de type Ia comme indicateurs de distance est un pilier du modèle de concordance actuel en cosmologie. Le travail d'instrumentation présenté dans… (more)

Juramy, Claire

2006-01-01T23:59:59.000Z

134

Toward Exascale Computing of Type Ia and Ib,c Supernovae: V&V...  

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

Toward Exascale Computing of Type Ia and Ib,c Supernovae: V&V of Current Models PI Name: Don Lamb PI Email: lamb@oddjob.uchicago.edu Institution: University Of Chicago Allocation...

135

ALS@20  

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

feed-image feed-image Digg: ALSBerkeleyLab Facebook Page: 208064938929 Flickr: advancedlightsource Twitter: ALSBerkeleyLab YouTube: AdvancedLightSource Home About the ALS ALS@20 ALS@20 ALS@20 Kick-Off Celebration Print On Friday, January 11, the Advanced Light Source celebrated the beginning of its 20th anniversary year with a brunch attended by more than 150 current and past staff members. After introductory remarks describing the trials and tribulations encountered during the construction of the ALS from former Director Jay Marx, current ALS Scientific Director Steve Kevan and Director Roger Falcone talked about the progress of the facility over the years. Attendees were then able to view more than 500 historical photos of the ALS and its staff displayed around the room.

136

Diversity of supernovae Ia determined using equivalent widths of Si II 4000  

E-Print Network (OSTI)

Spectroscopic and photometric properties of low and high-z supernovae Ia (SNe Ia) have been analyzed in order to achieve a better understanding of their diversity and to identify possible SN Ia sub-types. We use wavelet transformed spectra in which one can easily measure spectral features. We investigate the \\ion{Si}{II} 4000 equivalent width ($EW_w\\lbrace\\ion{Si}{II}\\rbrace$). The ability and, especially, the ease in extending the method to SNe at high-$z$ is demonstrated. We applied the method to 110 SNe Ia and found correlations between $EW_w\\lbrace\\ion{Si}{II}\\rbrace$ and parameters related to the light-curve shape for 88 supernovae with available photometry. No evidence for evolution of $EW_w\\lbrace\\ion{Si}{II}\\rbrace$ with redshift is seen. Three sub-classes of SNe Ia were confirmed using an independent cluster analysis with only light-curve shape, colour, and $EW_w\\lbrace\\ion{Si}{II}\\rbrace$. SNe from high-$z$ samples seem to follow a similar grouping to nearby objects. The $EW_w\\lbrace\\ion{Si}{II}\\rbrace$ value measured on a single spectrum may point towards SN Ia sub-classification, avoiding the need for expansion velocity gradient calculations.

V. Arsenijevic; S. Fabbro; A. M. Mourao; A. J. Rica da Silva

2008-09-18T23:59:59.000Z

137

Industry @ ALS  

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

Industry @ ALS Industry @ ALS Industry @ ALS Concrete Industry Benefits from Ancient Romans and the ALS Print Thursday, 17 October 2013 14:24 New insights into the Romans' ingenious concrete harbor structures emerging from ALS beamline research could move the modern concrete industry toward its goal of a reduced carbon footprint. Summary Slide Read more... Moving Industry Forward: Finding the Environmental Opportunity in Biochar Print Thursday, 12 September 2013 08:41 Using ALS Beamlines 10.3.2 and 8.3.2, the Environmental Protection Agency (EPA) is currently investigating how biochar sorbs environmental toxins and which kinds of biochar are the most effective. The possibilities for widespread use have already launched entrepreneurial commercial ventures. Summary Slide

138

ALS Visitors  

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

Energy. March 2010 ALS Project Manager Steve Rossi hosted a group of visitors from Kazakhstan on Friday, March 5. The visitors, including a representative from the Kazakhstan...

139

THE DETONATION MECHANISM OF THE PULSATIONALLY ASSISTED GRAVITATIONALLY CONFINED DETONATION MODEL OF Type Ia SUPERNOVAE  

Science Conference Proceedings (OSTI)

We describe the detonation mechanism composing the 'pulsationally assisted' gravitationally confined detonation (GCD) model of Type Ia supernovae. This model is analogous to the previous GCD model reported in Jordan et al.; however, the chosen initial conditions produce a substantively different detonation mechanism, resulting from a larger energy release during the deflagration phase. The resulting final kinetic energy and {sup 56}Ni yields conform better to observational values than is the case for the 'classical' GCD models. In the present class of models, the ignition of a deflagration phase leads to a rising, burning plume of ash. The ash breaks out of the surface of the white dwarf, flows laterally around the star, and converges on the collision region at the antipodal point from where it broke out. The amount of energy released during the deflagration phase is enough to cause the star to rapidly expand, so that when the ash reaches the antipodal point, the surface density is too low to initiate a detonation. Instead, as the ash flows into the collision region (while mixing with surface fuel), the star reaches its maximally expanded state and then contracts. The stellar contraction acts to increase the density of the star, including the density in the collision region. This both raises the temperature and density of the fuel-ash mixture in the collision region and ultimately leads to thermodynamic conditions that are necessary for the Zel'dovich gradient mechanism to produce a detonation. We demonstrate feasibility of this scenario with three three-dimensional (3D), full star simulations of this model using the FLASH code. We characterized the simulations by the energy released during the deflagration phase, which ranged from 38% to 78% of the white dwarf's binding energy. We show that the necessary conditions for detonation are achieved in all three of the models.

Jordan, G. C. IV; Graziani, C.; Weide, K.; Norris, J.; Hudson, R.; Lamb, D. Q. [Flash Center for Computational Science, University of Chicago, Chicago, IL 60637 (United States); Fisher, R. T. [Department of Physics, University of Massachusetts Dartmouth, 285 Old Westport Road, North Dartmouth, MA 02740 (United States); Townsley, D. M. [Department of Physics and Astronomy, University of Alabama, Tuscaloosa, AL 35487 (United States); Meakin, C. [Steward Observatory, University of Arizona, Tucson, AZ 85721 (United States); Reid, L. B. [NTEC Environmental Technology, Subiaco WA 6008 (Australia)

2012-11-01T23:59:59.000Z

140

Revealing Type Ia supernova physics with cosmic rates and nuclear gamma rays  

E-Print Network (OSTI)

Type Ia supernovae (SNIa) remain mysterious despite their central importance in cosmology and their rapidly increasing discovery rate. The progenitors of SNIa can be probed by the delay time between progenitor birth and explosion as SNIa. The explosions and progenitors of SNIa can be probed by MeV nuclear gamma rays emitted in the decays of radioactive nickel and cobalt into iron. We compare the cosmic star formation and SNIa rates, finding that their different redshift evolution requires a large fraction of SNIa to have large delay times. A delay time distribution of the form t^{-1.0 +/- 0.3} provides a good fit, implying 50% of SNIa explode more than ~ 1 Gyr after progenitor birth. The extrapolation of the cosmic SNIa rate to z = 0 agrees with the rate we deduce from catalogs of local SNIa. We investigate prospects for gamma-ray telescopes to exploit the facts that escaping gamma rays directly reveal the power source of SNIa and uniquely provide tomography of the expanding ejecta. We find large improvements relative to earlier studies by Gehrels et al. in 1987 and Timmes & Woosley in 1997 due to larger and more certain SNIa rates and advances in gamma-ray detectors. The proposed Advanced Compton Telescope, with a narrow-line sensitivity ~ 60 times better than that of current satellites, would, on an annual basis, detect up to ~ 100 SNIa (3 sigma) and provide revolutionary model discrimination for SNIa within 20 Mpc, with gamma-ray light curves measured with ~ 10 sigma significance daily for ~ 100 days. Even more modest improvements in detector sensitivity would open a new and invaluable astronomy with frequent SNIa gamma-ray detections.

Shunsaku Horiuchi; John F. Beacom

2010-06-30T23:59:59.000Z

Note: This page contains sample records for the topic "ti ia al" 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

Verifying the Cosmological Utility of Type Ia Supernovae: Implications of a Dispersion in the Ultraviolet Spectra  

SciTech Connect

We analyze the mean rest-frame ultraviolet (UV) spectrum of Type Ia Supernovae (SNe) and its dispersion using high signal-to-noise ratio Keck-I/LRIS-B spectroscopy for a sample of 36 events at intermediate redshift (z=0.5) discovered by the Canada-France-Hawaii Telescope Supernova Legacy Survey (SNLS). We introduce a new method for removing host galaxy contamination in our spectra, exploiting the comprehensive photometric coverage of the SNLS SNe and their host galaxies, thereby providing the first quantitative view of the UV spectral properties of a large sample of distant SNe Ia. Although the mean SN Ia spectrum has not evolved significantly over the past 40percent of cosmic history, precise evolutionary constraints are limited by the absence of a comparable sample of high-quality local spectra. The mean UV spectrum of our z~;;=0.5 SNe Ia and its dispersion is tabulated for use in future applications. Within the high-redshift sample, we discover significant UV spectral variations and exclude dust extinction as the primary cause by examining trends with the optical SN color. Although progenitor metallicity may drive some of these trends, the variations we see are much larger than predicted in recent models and do not follow expected patterns. An interesting new result is a variation seen in the wavelength of selected UV features with phase. We also demonstrate systematic differences in the SN Ia spectral features with SN light curve width in both the UV and the optical. We show that these intrinsic variations could represent a statistical limitation in the future use of high-redshift SNe Ia for precision cosmology. We conclude that further detailed studies are needed, both locally and at moderate redshift where the rest-frame UV can be studied precisely, in order that future missions can confidently be planned to fully exploit SNe Ia as cosmological probes.

Nugent, Peter E; Ellis, R.S.; Sullivan, M.; Nugent, P.E.; Howell, D.A.; Gal-Yam, A.; Astier, P.; Balam, D.; Balland, C.; Basa, S.; Carlberg, R.; Conley, A.; Fouchez, D.; Guy, J.; Hardin, D.; Hook, I.; Pain, R.; Perrett, K.; Pritchet, C.J.; Regnault, N.

2008-02-28T23:59:59.000Z

142

ALS Visitors  

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

ALS Visitors ALS Visitors ALS Visitors Print Wednesday, 29 July 2009 00:00 ALS staff members host a variety of scientific, educational, government, and community-related tours each month. November 2013 poneman U.S. Deputy Secretary of Energy Daniel Poneman visited Berkeley Lab on Friday, Nov. 15, during a brief stay in the Bay Area. Glenn Mara of the University of California Office of the President and Aundra Richards of the DOE Berkeley Site Office joined Deputy Laboratory Director Horst Simon's welcome. They updated Poneman on the lab's future initiatives and current capital projects and heard briefings on cyber security, computing, and the Joint BioEnergy Institute. As second-in-command at DOE, Poneman is responsible for assisting the Secretary of Energy in the management and operations of the agency and acting on his behalf when necessary.During his tour of the ALS, Poneman (right) spoke with Ken Goldberg (Materials Sciences Division) at the CXRO beamline.

143

O Ti-tE LOVE  

Office of Legacy Management (LM)

' ItqQtJulRl' IICt' O Ti-tE LOVE ~t?Al. . . At2D Al.CLkTED IChTTEtt~ . ' . . . : . ' . i I . . . . .mr TttE HOt\' ORAULE~ STANLEY FItZl:; SFCAKER ' . : ,J WE\J i' ORti STATE ASSH' rtrLY l r . . isay 29,.1980 Consultant to the Kew York ' , .' .I, " ..' . ,"' ! -. . . : . . . I.. . . . . ~. ,:- 9.. :. .' , * Ill . ,.. , ,i / All . ' %: : . : . . -. ;:. * :... . _ -. .' . . . I . ' J n' f armed. ?%c firtdingo and backup documentatiin embodied in thi preliminafy report compel the Task Yorao to call trprm ym; thr: . . I SpcnXer, to cwthorim crnd ompowcr the Assemly Sta?ding,CozmiCte I ' . : ,. . ..: .I' .,' :. .~.. ,:. :,-"'. ; ..d ::. . . .~~ ' .,' .' . : ' , ' ..,, -. . -. . . : : ? :. . . . .; *. . 1 ,.' .i. . . : \. .- :. " ' . . . c. : . I ! .'

144

THE FIRST MAXIMUM-LIGHT ULTRAVIOLET THROUGH NEAR-INFRARED SPECTRUM OF A TYPE Ia SUPERNOVA  

Science Conference Proceedings (OSTI)

We present the first maximum-light ultraviolet (UV) through near-infrared (NIR) Type Ia supernova (SN Ia) spectrum. This spectrum of SN 2011iv was obtained nearly simultaneously by the Hubble Space Telescope at UV/optical wavelengths and the Magellan Baade telescope at NIR wavelengths. These data provide the opportunity to examine the entire maximum-light SN Ia spectral energy distribution. Since the UV region of an SN Ia spectrum is extremely sensitive to the composition of the outer layers of the explosion, which are transparent at longer wavelengths, this unprecedented spectrum can provide strong constraints on the composition of the SN ejecta, and similarly the SN explosion and progenitor system. SN 2011iv is spectroscopically normal, but has a relatively fast decline ({Delta}m{sub 15}(B) = 1.69 {+-} 0.05 mag). We compare SN 2011iv to other SNe Ia with UV spectra near maximum light and examine trends between UV spectral properties, light-curve shape, and ejecta velocity. We tentatively find that SNe with similar light-curve shapes but different ejecta velocities have similar UV spectra, while those with similar ejecta velocities but different light-curve shapes have very different UV spectra. Through a comparison with explosion models, we find that both a solar-metallicity W7 and a zero-metallicity delayed-detonation model provide a reasonable fit to the spectrum of SN 2011iv from the UV to the NIR.

Foley, Ryan J.; Marion, G. Howie; Challis, Peter; Kirshner, Robert P.; Berta, Zachory K. [Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138 (United States); Kromer, Markus; Taubenberger, Stefan; Hillebrandt, Wolfgang; Roepke, Friedrich K.; Ciaraldi-Schoolmann, Franco; Seitenzahl, Ivo R. [Max-Planck-Institut fuer Astrophysik, Karl-Schwarzschild-Strasse 1, D-85748 Garching bei Muenchen (Germany); Pignata, Giuliano [Departamento de Ciencias Fisicas, Universidad Andres Bello, Avda. Republica 252, Santiago (Chile); Stritzinger, Maximilian D. [Department of Physics and Astronomy, Aarhus University, Ny Munkegade, DK-8000 Aarhus C (Denmark); Filippenko, Alexei V.; Li Weidong; Silverman, Jeffrey M. [Department of Astronomy, University of California, Berkeley, CA 94720-3411 (United States); Folatelli, Gaston [Kavli Institute for the Physics and Mathematics of the Universe (Kavli IPMU, WPI), Todai Institutes for Advanced Study, University of Tokyo, Kashiwa 277-8583 (Japan); Hsiao, Eric Y.; Morrell, Nidia I. [Carnegie Observatories, Las Campanas Observatory, La Serena (Chile); Simcoe, Robert A., E-mail: rfoley@cfa.harvard.edu [MIT-Kavli Institute for Astrophysics and Space Research, 77 Massachusetts Avenue, 37-664D Cambridge, MA 02139 (United States); and others

2012-07-01T23:59:59.000Z

145

ALS Visitors  

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

ALS Visitors Print ALS Visitors Print ALS staff members host a variety of scientific, educational, government, and community-related tours each month. November 2013 poneman U.S. Deputy Secretary of Energy Daniel Poneman visited Berkeley Lab on Friday, Nov. 15, during a brief stay in the Bay Area. Glenn Mara of the University of California Office of the President and Aundra Richards of the DOE Berkeley Site Office joined Deputy Laboratory Director Horst Simon's welcome. They updated Poneman on the lab's future initiatives and current capital projects and heard briefings on cyber security, computing, and the Joint BioEnergy Institute. As second-in-command at DOE, Poneman is responsible for assisting the Secretary of Energy in the management and operations of the agency and acting on his behalf when necessary.During his tour of the ALS, Poneman (right) spoke with Ken Goldberg (Materials Sciences Division) at the CXRO beamline.

146

Al Weinrub  

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

Al Weinrub Al Weinrub Author, "COMMUNITY POWER: Decentralized Renewable Energy in California" Member, Sierra Club California Clean Energy-Climate CommitteeMember, Steering Committee, Bay Area Clean Energy Alliance al.weinrub@comcast.net This speaker was a visiting speaker who delivered a talk or talks on the date(s) shown at the links below. This speaker is not otherwise associated with Lawrence Berkeley National Laboratory, unless specifically identified as a Berkeley Lab staff member. Al Weinrub is a member of the Sierra Club California Energy-Climate Committee and serves on the Steering Committee of the Bay Area's Local Clean Energy Alliance. He is the author of COMMUNITY POWER: Decentralized Renewable Energy in California (http://www.localcleanenergy.org/Community-Power-Publication)

147

Al Gallo  

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

As the Director for the Office of Technology Evaluation, Al Gallo works closely with the Chief Technology Officer as well as many Program Offices to advance the introduction and adoption of...

148

Spectral Modeling of SNe Ia Near Maximum Light: Probing the Characteristics of Hydro Models  

E-Print Network (OSTI)

We have performed detailed NLTE spectral synthesis modeling of 2 types of 1-D hydro models: the very highly parameterized deflagration model W7, and two delayed detonation models. We find that overall both models do about equally well at fitting well observed SNe Ia near to maximum light. However, the Si II 6150 feature of W7 is systematically too fast, whereas for the delayed detonation models it is also somewhat too fast, but significantly better than that of W7. We find that a parameterized mixed model does the best job of reproducing the Si II 6150 line near maximum light and we study the differences in the models that lead to better fits to normal SNe Ia. We discuss what is required of a hydro model to fit the spectra of observed SNe Ia near maximum light.

E. Baron; S. Bongard; David Branch; Peter H. Hauschildt

2006-03-03T23:59:59.000Z

149

THE LOW-VELOCITY, RAPIDLY FADING TYPE Ia SUPERNOVA 2002es  

SciTech Connect

SN 2002es is a peculiar subluminous Type Ia supernova (SN Ia) with a combination of observed characteristics never before seen in an SN Ia. At maximum light, SN 2002es shares spectroscopic properties with the underluminous SN 1991bg subclass of SNe Ia, but with substantially lower expansion velocities ({approx}6000 km s{sup -1}) more typical of the peculiar SN 2002cx subclass. Photometrically, SN 2002es differs from both SN 1991bg-like and SN 2002cx-like supernovae. Although at maximum light it is subluminous (M{sub B} = -17.78 mag), SN 2002es has a relatively broad light curve ({Delta}m{sub 15}(B) = 1.28 {+-} 0.04 mag), making it a significant outlier in the light-curve width versus luminosity relationship. We estimate a {sup 56}Ni mass of 0.17 {+-} 0.05 M{sub Sun} synthesized in the explosion, relatively low for an SN Ia. One month after maximum light, we find an unexpected plummet in the bolometric luminosity. The late-time decay of the light curves is inconsistent with our estimated {sup 56}Ni mass, indicating that either the light curve was not completely powered by {sup 56}Ni decay or the ejecta became optically thin to {gamma}-rays within a month after maximum light. The host galaxy is classified as an S0 galaxy with little to no star formation, indicating that the progenitor of SN 2002es is likely from an old stellar population. We also present a less extensive data set for SN 1999bh, an object which shares similar photometric and spectroscopic properties. Both objects were found as part of the Lick Observatory Supernova Search, allowing us to estimate that these objects should account for 2.5% of SNe Ia within a fixed volume. Current theoretical models are unable to explain the observed characteristics of SN 2002es.

Ganeshalingam, Mohan; Li Weidong; Filippenko, Alexei V.; Silverman, Jeffrey M.; Shen, Ken J. [Department of Astronomy, University of California, Berkeley, CA 94720-3411 (United States); Chornock, Ryan; Foley, Ryan J.; Kirshner, Robert P.; Calkins, Mike [Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138 (United States); Matheson, Thomas [National Optical Astronomy Observatory, 950 North Cherry Avenue, Tucson, AZ 85719 (United States); Milne, Peter, E-mail: mganesh@astro.berkeley.edu [Steward Observatory, University of Arizona, 933 North Cherry Avenue, Tucson, AZ 85721 (United States)

2012-06-01T23:59:59.000Z

150

D-10: The Effect of Molybdenum on Nb,Ti(C,N) Precipitate Evolution ...  

Science Conference Proceedings (OSTI)

The effects of molybdenum on niobium-bearing carbonitride interfacial ... D-7: Quantification of Compositional Effects on Transformation Kinetics in High ... D-9: Study of Shear Behavior of Al, TiN, and Their Interface Using ab intio Method.

151

ALS Visitors  

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

Quick Facts Quick Facts ALS Visitors Print ALS staff members host a variety of scientific, educational, government, and community-related tours each month. November 2013 poneman U.S. Deputy Secretary of Energy Daniel Poneman visited Berkeley Lab on Friday, Nov. 15, during a brief stay in the Bay Area. Glenn Mara of the University of California Office of the President and Aundra Richards of the DOE Berkeley Site Office joined Deputy Laboratory Director Horst Simon's welcome. They updated Poneman on the lab's future initiatives and current capital projects and heard briefings on cyber security, computing, and the Joint BioEnergy Institute. As second-in-command at DOE, Poneman is responsible for assisting the Secretary of Energy in the management and operations of the agency and acting on his behalf when necessary.During his tour of the ALS, Poneman (right) spoke with Ken Goldberg (Materials Sciences Division) at the CXRO beamline.

152

??e¦ia e e ¡et ??? oa¦0 to 3i5¦ontinBoB5 Pie¦eFi5e Hinea ¢tiTiUation ...  

E-Print Network (OSTI)

Analysis and Simplicial Subdivision,?·l k ?????? ? ransactions onvd ircuits ... Ordered Sets: A Polyhedral Approach,%²q h atC? ematicalG? ro?? ram-.

153

Final Technical Report: Discovering the Nature of Dark Energy: Towards Better Distances from Type Ia Supernovae  

Science Conference Proceedings (OSTI)

The final technical report from the project "Discovering the Nature of Dark Energy: Towards Better Distances from Type Ia Supernovae" led at Rutgers the State University of New Jersey by Prof. Saurabh W. Jha is presented, including all publications resulting from this award.

Saurabh W. Jha

2012-10-03T23:59:59.000Z

154

Symbiotic stars as possible progenitors of SNe Ia: binary parameters and overall outlook  

E-Print Network (OSTI)

Symbiotic stars are interacting binaries in which the first-formed white dwarf accretes and burns material from a red giant companion. This paper aims at presenting physical characteristics of these objects and discussing their possible link with progenitors of type Ia supernovae.

Miko?ajewska, J

2011-01-01T23:59:59.000Z

155

Flames in Type Ia Supernova: Deflagration-Detonation Transition in the Oxygen Burning Flame  

E-Print Network (OSTI)

Flames in Type Ia Supernova: Deflagration-Detonation Transition in the Oxygen Burning Flame S. E structure which, de- pending on density, may involve separate regions of carbon, oxygen and silicon burning, all propagating in a self-similar, subsonic front. The separation between these three burning regions

156

A Test for the Nature of the Type Ia Supernova Explosion Mechanism  

E-Print Network (OSTI)

Currently popular models for Type Ia supernovae (SNe Ia) fall into two general classes. The first comprises explosions of nearly pure carbon/oxygen (C/O) white dwarfs at the Chandrasekhar limit which ignite near their centers. The second consists of lower-mass C/O cores which are ignited by the detonation of an accreted surface helium layer. Explosions of the latter type produce copious Fe, Co and Ni K-alpha emission from 56Ni and 56Co decay in the detonated surface layers, emission which is much weaker from Chandrasekhar-mass models. The presence of this emission provides a simple and unambiguous discriminant between these two models for SNe Ia. Both mechanisms may produce 0.1-0.6 solar masses of 56Ni, making them bright gamma-ray line emitters. The time to maximum brightness of 56Ni decay lines is distinctly shorter in the sub-Chandrasekhar mass class of model (approximately 15 days) than in the Chandrasekhar mass model (approximately 30 days), making gamma-ray line evolution another direct test of the explosion mechanism. It should just be possible to detect K-shell emission from a sub-Chandrasekhar explosion from SNe Ia as far away as the Virgo cluster with the XMM Observatory. A 1 to 2 square meter X-ray telescope such as the proposed Con-X Observatory could observe K-alpha emission from sub-Chandrasekhar mass SNe Ia in the Virgo cluster, providing not just a detection, but high-accuracy flux and kinematic information.

Philip A. Pinto; Ronald G. Eastman; Tamara Rogers

2000-08-21T23:59:59.000Z

157

WHITE DWARF/M DWARF BINARIES AS SINGLE DEGENERATE PROGENITORS OF TYPE Ia SUPERNOVAE  

SciTech Connect

Limits on the companions of white dwarfs in the single-degenerate scenario for the origin of Type Ia supernovae (SNe Ia) have gotten increasingly tight, yet igniting a nearly Chandrasekhar mass C/O white dwarf from a condition of near hydrostatic equilibrium provides compelling agreement with observed spectral evolution. The only type of non-degenerate stars that survive the tight limits, M{sub V} {approx}> 8.4 on the SN Ia in SNR 0509-67.5 and M{sub V} {approx}> 9.5 in the remnant of SN 1572, are M dwarfs. While M dwarfs are observed in cataclysmic variables, they have special properties that have not been considered in most work on the progenitors of SNe Ia: they have small but finite magnetic fields and they flare frequently. These properties are explored in the context of SN Ia progenitors. White dwarf/M dwarf pairs may be sufficiently plentiful to provide, in principle, an adequate rate of explosions even with slow orbital evolution due to magnetic braking or gravitational radiation. Even modest magnetic fields on the white dwarf and M dwarf will yield adequate torques to lock the two stars together, resulting in a slowly rotating white dwarf, with the magnetic poles pointing at one another in the orbital plane. The mass loss will be channeled by a 'magnetic bottle' connecting the two stars, landing on a concentrated polar area on the white dwarf. This enhances the effective rate of accretion compared to spherical accretion. Luminosity from accretion and hydrogen burning on the surface of the white dwarf may induce self-excited mass transfer. The combined effects of self-excited mass loss, polar accretion, and magnetic inhibition of mixing of accretion layers give possible means to beat the 'nova limit' and grow the white dwarf to the Chandrasekhar mass even at rather moderate mass accretion rates.

Wheeler, J. Craig, E-mail: wheel@astro.as.utexas.edu [Department of Astronomy, University of Texas at Austin, Austin, TX 78712 (United States)

2012-10-20T23:59:59.000Z

158

AL. I  

Office of Legacy Management (LM)

AL. I AL. I Department of Energy Washington, DC 20545 OCT 13 Vii87 Mr. John T. Shields A214 National Fertilizer Development Center Tennessee Valley Authority Muscle Shoals, Alabama 35660 Dear Mr. Shields: As you may know, the Department of Energy (DOE) is evaluating the radiological condition of sites that were utilized under the Manhattan Engineer District and the Atomic Energy Commission (AEC) during the early years of nuclear development to determine whether they need remedial action and whether the Department has authority to perform such action. AEC work at the TVA during the period 1951 through 1955 involved the development of a process to recover uranium from the production of phosphate fertilizer. A laboratory and pilot plant were operated at the site, but very little

159

Effect of the top electrode materials on the resistive switching characteristics of TiO{sub 2} thin film  

Science Conference Proceedings (OSTI)

Various metals, such as Pt, stainless steel (SUS), Al, Ni, and Ti, were used as a top electrode (TE) to evaluate the dependency of the resistive switching characteristics on the TE of the metal/TiO{sub 2}/Pt structure. The variation of the chemical composition of TiO{sub 2} in the metal/TiO{sub 2}/Pt structure before and after switching was examined to identify the factors affecting the resistive switching characteristics of the samples with various TE materials. In the case of TE/TiO{sub 2}/Pt structures showing unstable resistive switching behavior, e.g., those with the Al, Ni, and Ti TEs, secondary ion mass spectrometry revealed an increase in the oxygen concentration at the interface area between the TE metal and TiO{sub 2}. This suggests that the oxidation reaction at the interface between the TE metal and TiO{sub 2} might cause the TE/TiO{sub 2}/Pt structure to exhibit unstable resistive switching characteristics. According to these results, the oxidation reaction at the interface between the metal TE and TiO{sub 2} thin film is a primary factor affecting the resistive switching characteristics of TiO{sub 2}-based Resistive Random Access Memory devices.

Oh, Sang Chul [Department of Nano-Semiconductor Engineering, Korea University, Seoul 136-701 (Korea, Republic of); Jung, Ho Yong [Department of Material Science and Engineering, Korea University, Seoul 136-701 (Korea, Republic of); R and D Division, Hynix Semiconductor Inc., Cheongju 361-725 (Korea, Republic of); Lee, Heon [Department of Nano-Semiconductor Engineering, Korea University, Seoul 136-701 (Korea, Republic of); Department of Material Science and Engineering, Korea University, Seoul 136-701 (Korea, Republic of)

2011-06-15T23:59:59.000Z

160

Thermodynamic Investigations in the Ternary Al-Ti-Cr System  

Science Conference Proceedings (OSTI)

About this Abstract. Meeting, 2014 TMS Annual Meeting & Exhibition. Symposium , Hume-Rothery Award Symposium: Thermodynamics and Kinetics of ...

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161

File:USDA-CE-Production-GIFmaps-IA.pdf | Open Energy Information  

Open Energy Info (EERE)

IA.pdf IA.pdf Jump to: navigation, search File File history File usage Iowa Ethanol Plant Locations Size of this preview: 776 × 600 pixels. Full resolution ‎(1,650 × 1,275 pixels, file size: 303 KB, MIME type: application/pdf) Description Iowa Ethanol Plant Locations Sources United States Department of Agriculture Related Technologies Biomass, Biofuels, Ethanol Creation Date 2010-01-19 Extent State Countries United States UN Region Northern America States Iowa External links http://www.nass.usda.gov/Charts_and_Maps/Ethanol_Plants/ File history Click on a date/time to view the file as it appeared at that time. Date/Time Thumbnail Dimensions User Comment current 16:13, 27 December 2010 Thumbnail for version as of 16:13, 27 December 2010 1,650 × 1,275 (303 KB) MapBot (Talk | contribs) Automated bot upload

162

IA REP0 SAND85-2809 Unlimited Release UC-92A  

Office of Scientific and Technical Information (OSTI)

IA REP0 SAND85-2809 Unlimited Release UC-92A IA REP0 SAND85-2809 Unlimited Release UC-92A Printed July 1986 High Energy Gas Fracture Experiments in Fluid-Filled Boreholes-Potential Geothermal Application J. F. Cuderman, T. Y. Chu, J. Jung, R. D. Jacobson Prepared by Sandia National Laboratories Albuquerque, New Mexico 87 185 and Livermore, California 94550 for the United States Department of Energy under Contract DE-AC04-76DP00789 DISCLAIMER This report was prepared as an account of work sponsored by an agency of the United States Government. Neither the United States Government nor any agency Thereof, nor any of their employees, makes any warranty, express or implied, or assumes any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process

163

The structure of 23Al and astrophysical consequences  

E-Print Network (OSTI)

Motivated by existing nuclear astrophysics problems, the B-decay of the proton rich nucleus 23Al was studied for the first time with pure samples which were obtained by using the 1H(24Mg,23Al)2n reaction and the MARS recoil separator at Texas A&M University. B and B-y coincidence measurements were made with a fast tape-transport system, scintillator, BGO and HPGe y detectors. The experiment allowed us to measure absolute B branching ratios and to determine logft values for transitions to final states in 23Mg, including the isobaric analog state (IAS), and, therefore, to determine unambiguously the spin and parity of the 23Al ground state to be J^Pi = 5/2+. This work excludes the large increases in the radiative proton capture cross section for the reaction 22Mg(p, )23Al at astrophysical energies, which were implied by claims that the spin and parity of the 23Al ground state were J^Pi = 1/2+. More precise half life and mass determinations of 23Al were obtained from the experimental data. The logft for the Fermi transition to its isobaric analog state in 23Mg was also determined for the first time. This IAS and a state 16 keV below it were observed, well separated in the same experiment for the first time. The B-decay scheme of the proton rich nucleus 23Al was established. We can now solve a number of inconsistencies in the literature, exclude strong isospin mixing claimed before, and obtain a new determination of the resonance strength. The IAS and the state 16 keV below it are resonances in the 22Na(p, )23 Mg reaction at energies that are important in novae. This second state turns out to be the resonance that gives the most important contribution in the depletion of 22Na from novae. Both of the reactions of 22Mg(p, )23Al and 22Na(p, )23Mg have been suggested as possible candidates for diverting some of the flux in oxygen-neon novae explosions from the A=22 into the A=23 mass chain.

Zhai, Yongjun

2007-12-01T23:59:59.000Z

164

Integral Airframe Structures (IAS)---Validated Feasibility Study of Integrally Stiffened Metallic Fuselage Panels for Reducing Manufacturing Costs  

Science Conference Proceedings (OSTI)

The Integral Airframe Structures (IAS) program investigated the feasibility of using "integrally stiffened" construction for commercial transport fuselage structure. The objective of the program was to demonstrate structural performance and weight equal ...

Munroe J.; Wilkins K.; Gruber M.

2000-05-01T23:59:59.000Z

165

In vivo cofactor biosynthesis and maintenance in the class Ia ribonucleotide reductase small subunit of Escherichia coli  

E-Print Network (OSTI)

The small subunit ([beta]2) of Escherichia coli class Ia ribonucleotide reductases (RNRs) contains a diferric tyrosyl radical (Y*) cofactor essential for the conversion of nucleotides to deoxynucleotides that are needed ...

Wu, Chia-Hung, Ph. D. Massachusetts Institute of Technology

2009-01-01T23:59:59.000Z

166

Generation of a stable, aminotyrosyl radical-induced ?2?2 complex of Escherichia coli class Ia ribonucleotide reductase  

E-Print Network (OSTI)

Ribonucleotide reductase (RNR) catalyzes the conversion of nucleoside diphosphates to deoxynucleoside diphosphates (dNDPs). The Escherichia coli class Ia RNR uses a mechanism of radical propagation by which a cysteine in ...

Minnihan, Ellen Catherine

167

SELF-SHIELDING OF SOFT X-RAYS IN TYPE Ia SUPERNOVA PROGENITORS  

SciTech Connect

There are insufficient super-soft ({approx}0.1 keV) X-ray sources in either spiral or elliptical galaxies to account for the rate of explosion of Type Ia supernovae (SNe Ia) in either the single-degenerate or the double-degenerate scenarios. We quantify the amount of circumstellar matter that would be required to suppress the soft X-ray flux by yielding a column density in excess of 10{sup 23} cm{sup -2}. We summarize evidence that appropriate quantities of matter are extant in SNe Ia and in recurrent novae that may be supernova precursors. The obscuring matter is likely to have a large, but not complete, covering factor and to be substantially non-spherically symmetric. Assuming that much of the absorbed X-ray flux is re-radiated as blackbody radiation in the UV, we estimate that {approx}<100 sources might be detectable in the Galaxy Evolution Explorer All-sky Survey.

Wheeler, J. Craig [Department of Astronomy, University of Texas at Austin, Austin, TX (United States)] [Department of Astronomy, University of Texas at Austin, Austin, TX (United States); Pooley, D., E-mail: wheel@astro.as.utexas.edu [Department of Physics, Sam Houston State University, Huntsville, TX (United States)

2013-01-10T23:59:59.000Z

168

Restframe I-band Hubble diagram for type Ia supernovae up toredshift z ~; 0.5  

SciTech Connect

We present a novel technique for fitting rest frame I-bandlight curves on a data set of 42 type Ia supernovae (SNe Ia). Using the result of the fit, we construct a Hubble diagram with 26 SNe from the subset at 0.01 < z < 0.1. Adding two SNe at z {approx} 0.5 yields results consistent with a flat Lambda-dominated ''concordance universe'' (OmegaM,Omega Lambda) = (0.25, 0.75). For one of these, SN 2000fr, new near infrared data are presented. The high redshift supernova NIR data are also used to test for systematic effects in the use of SNe Ia as distance estimators. A flat, Lambda = 0, universe where the faintness of supernovae at z {approx} 0.5 is due to grey dust homogeneously distributed in the intergalactic medium is disfavored based on the high-z Hubble diagram using this small data-set. However, the uncertainties are large and no firm conclusion may be drawn. We explore the possibility of setting limits on intergalactic dust based on B - I and B - V color measurements, and conclude that about 20 well measured SNe are needed to give statistically significant results. We also show that the high redshift restframe I-band data points are better fit by light curve templates that show a prominent second peak, suggesting that they are not intrinsically underluminous.

Nobili, S.; Amanullah, R.; Garavini, G.; Goobar, A.; Lidman, C.; Stanishev, V.; Aldering, G.; Antilogus, P.; Astier, P.; Burns, M.S.; Conley, A.; Deustua, S.E.; Ellis, R.; Fabbro, S.; Fadeyev, V.; Folatelli,G.; Gibbons, R.; Goldhaber, G.; Groom, D.E.; Hook, I.; Howell, D.A.; Kim,A.G.; Knop, R.A.; Nugent, P.E.; Pain, R.; Perlmutter, S.; Quimby, R.; Raux, J.; Regnault, N.; Ruiz-Lapuente, P.; Sainton, G.; Schahmaneche, K.; Smith, E.; Spadafora, A.L.; Thomas, R.C.; Wang, L.

2005-04-01T23:59:59.000Z

169

Observational constraints from SNe Ia and Gamma-Ray Bursts on a clumpy universe  

E-Print Network (OSTI)

The luminosity distance describing the effect of local inhomogeneities in the propagation of light proposed by Zeldovich-Kantowski-Dyer-Roeder (ZKDR) is tested with two probes for two distinct ranges of redshifts: supernovae Ia (SNe Ia) in 0.015 gamma-ray bursts (GRBs) in 1.547 < z < 3.57. Our analysis is performed by a Markov Chain Monte Carlo (MCMC) code that allows us to constrain the matter density parameter \\Omega_m as well as the smoothness parameter $\\alpha$ that measures the inhomogeneous-homogeneous rate of the cosmic fluid in a flat \\LambdaCDM model. The obtained best fits are (\\Omega_m=0.285^{+0.019}_{-0.018}, \\alpha= 0.856^{+0.106}_{-0.176}) from SNe Ia and (\\Omega_m=0.259^{+0.028}_{-0.028}, \\alpha=0.587^{+0.201}_{-0.202}) from GRBs, while from the joint analysis the best fits are (\\Omega_m=0.284^{+0.021}_{-0.020}, \\alpha= 0.685^{+0.164}_{-0.171}) with a \\chi^2_{\\rm red}=0.975. The value of the smoothness parameter $\\alpha$ indicates a clumped universe however it does not have an impact on the amount of dark energy (cosmological constant) needed to fit observations. This result may be an indication that the Dyer-Roeder approximation does not describe in a precise form the effects of clumpiness in the expansion of the universe.

Nora Bretón; Ariadna Montiel

2013-03-06T23:59:59.000Z

170

The Cellular Burning Regime in Type Ia Supernova Explosions - I. Flame Propagation into Quiescent Fuel  

E-Print Network (OSTI)

We present a numerical investigation of the cellular burning regime in Type Ia supernova explosions. This regime holds at small scales (i.e. below the Gibson scale), which are unresolved in large-scale Type Ia supernova simulations. The fundamental effects that dominate the flame evolution here are the Landau-Darrieus instability and its nonlinear stabilization, leading to a stabilization of the flame in a cellular shape. The flame propagation into quiescent fuel is investigated addressing the dependence of the simulation results on the specific parameters of the numerical setup. Furthermore, we investigate the flame stability at a range of fuel densities. This is directly connected to the questions of active turbulent combustion (a mechanism of flame destabilization and subsequent self-turbulization) and a deflagration-to-detonation transition of the flame. In our simulations we find no substantial destabilization of the flame when propagating into quiescent fuels of densities down to ~10^7 g/cm^3, corroborating fundamental assumptions of large-scale SN Ia explosion models. For these models, however, we suggest an increased lower cutoff for the flame propagation velocity to take the cellular burning regime into account.

F. K. Roepke; W. Hillebrandt; J. C. Niemeyer

2003-12-03T23:59:59.000Z

171

ALS Project Management Manual  

E-Print Network (OSTI)

management practices across all ALS projects. It describesthat the primary weakness in ALS project management effortsrich projects common at the ALS. It is sometimes difficult

Krupnick, Jim; Harkins, Joe

2000-01-01T23:59:59.000Z

172

Measurements of the Rate of Type Ia Supernovae at Redshift z < ~0.3 from the SDSS-II Supernova Survey  

E-Print Network (OSTI)

We present a measurement of the volumetric Type Ia supernova (SN Ia) rate based on data from the Sloan Digital Sky Survey II (SDSS-II) Supernova Survey. The adopted sample of supernovae (SNe) includes 516 SNe Ia at redshift z \\lesssim 0.3, of which 270 (52%) are spectroscopically identified as SNe Ia. The remaining 246 SNe Ia were identified through their light curves; 113 of these objects have spectroscopic redshifts from spectra of their host galaxy, and 133 have photometric redshifts estimated from the SN light curves. Based on consideration of 87 spectroscopically confirmed non-Ia SNe discovered by the SDSS-II SN Survey, we estimate that 2.04+1.61-0.95 % of the photometric SNe Ia may be misidentified. The sample of SNe Ia used in this measurement represents an order of magnitude increase in the statistics for SN Ia rate measurements in the redshift range covered by the SDSS-II Supernova Survey. If we assume a SN Ia rate that is constant at low redshift (z < 0.15), then the SN observations can be used t...

Dilday, Benjamin; Bassett, Bruce; Becker, Andrew; Bender, Ralf; Castander, Francisco; Cinabro, David; Filippenko, Alexei V; Frieman, Joshua A; Galbany, Lluis; Garnavich, Peter M; Goobar, Ariel; Hopp, Ulrich; Ihara, Yutaka; Jha, Saurabh W; Kessler, Richard; Lampeitl, Hubert; Marriner, John; Miquel, Ramon; Molla, Mercedes; Nichol, Robert C; Nordin, Jakob; Riess, Adam G; Sako, Masao; Schneider, Donald P; Sollerman, Jesper; Wheeler, J Craig; Ostman, Linda; Bizyaev, Dmitry; Brewington, Howard; Malanushenko, Elena; Malanushenko, Viktor; Oravetz, Dan; Pan, Kaike; Simmons, Audrey; Snedden, Stephanie

2010-01-01T23:59:59.000Z

173

Access to the ALS  

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

Access to the ALS Access to the ALS Print User Access The ALS experiment floor (Building 6) is a Controlled Access Area for radiation protection. All ALS users are required to...

174

Access to the ALS  

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

Access to the ALS Print User Access The ALS experiment floor (Building 6) is a Controlled Access Area for radiation protection. All ALS users are required to register with the ALS...

175

Strong et al ALS FTD consensus criteria  

E-Print Network (OSTI)

Strong et al ALS FTD consensus criteria 1 Version: 20070606 Frontotemporal syndromes in amyotrophic, UCSF, San Francisco, California, USA (5) Forbes Norris MDA/ALS Research Center, San Francisco Kingdom (8) Science Director & Vice President, The ALS Association, Palm Harbor, Florida, U.S.A. (9

Dickerson, Brad

176

Notes on the compatibility of type Ia supernovae data and varying--$G$ cosmology  

E-Print Network (OSTI)

Observational data for type Ia supernovae, shows that the expansion of the universe is accelerated. This accelerated expansion can be described by a cosmological constant or by dark energy models like quintessence. An interesting question may be raised here. Is it possible to describe the accelerated expansion of universe using varying--$G$ cosmological models? Here we shall show that the price for having accelerated expansion in slow--varying--$G$ models (in which the dynamical terms of $G$ are ignored) is to have highly non--conserved matter and also that it is in contradiction with other data.

Shojai, F

2013-01-01T23:59:59.000Z

177

On the hydrogen emission from the type Ia supernova 2002ic  

DOE Green Energy (OSTI)

The discovery of SN 2002ic by the Supernova Factory and the subsequent spectroscopic studies have led to the surprising finding that SN 2002ic is a type Ia supernova with strong ejecta-circumstellar interaction. Here we show that nearly 1 year after the explosion the supernova has become fainter overall, but the H-alpha emission has brightened and broadened dramatically compared to earlier observations. We have obtained spectropolarimetry data which show that the hydrogen-rich matter is highly aspherically distributed. These observations suggest that the supernova exploded inside a dense, clumpy, disk-like circumstellar environment.

Wang, Lifan; Baade, Dietrich; Hoflich, Peter; Wheeler, J. Craig; Kawabata, Koji; Nomoto, Ken'ichi

2003-12-10T23:59:59.000Z

178

Photometric Observations of the Type Ia SN 2002er in UGC 10743  

E-Print Network (OSTI)

Extensive light and colour curves for the Type Ia supernova SN 2002er are presented as part of the European Supernova Collaboration. We have collected UBVRI photometry from ten different telescopes covering the phases from 7 days before until 619 days after maximum light. Corrections for the different instrumental systems and the non-thermal spectrum of the supernova (S-corrections) have been applied. With the densely sampled light curves we can make detailed comparisons to other well-observed objects. SN 2002er most closely resembles SN 1996X after maximum, but clearly shows a different colour evolution before peak light and a stronger shoulder in V and R bands compared to other well-observed SNe Ia. In particular, the rise time appears to be longer than what is expected from rise-time vs.decline-rate relation. We use several methods to determine the reddening towards SN 2002er based on the colour evolution at near peak and at late phases. The uvoir (bolometric) light curve shows great similarity with SN 199...

Pignata, G; Benetti, S; Blinnikov, S; Hillebrandt, W; Kotak, R; Leibundgut, B; Mazzali, P A; Meikle, P; Qiu, Y; Ruiz-Lapuente, P; Smartt, S; Sorokina, E; Stritzinger, M; Stehle, M; Turatto, M; Marsh, T; Martin-Luis, F; McBride, N; Méndez, J; Morales-Rueda, L; Narbutis, D; Street, R

2004-01-01T23:59:59.000Z

179

The Cellular Burning Regime in Type Ia Supernova Explosions - II. Flame Propagation into Vortical Fuel  

E-Print Network (OSTI)

We investigate the interaction of thermonuclear flames in Type Ia supernova explosions with vortical flows by means of numerical simulations. In our study, we focus on small scales, where the flame propagation is no longer dominated by the turbulent cascade originating from large-scale effects. Here, the flame propagation proceeds in the cellular burning regime, resulting from a balance between the Landau-Darrieus instability and its nonlinear stabilization. The interaction of a cellularly stabilized flame front with a vortical fuel flow is explored applying a variety of fuel densities and strengths of the velocity fluctuations. We find that the vortical flow can break up the cellular flame structure if it is sufficiently strong. In this case the flame structure adapts to the imprinted flow field. The transition from the cellularly stabilized front to the flame structure dominated by vortices of the flow proceeds in a smooth way. The implications of the results of our simulations for Type Ia Supernova explosion models are discussed.

F. K. Roepke; W. Hillebrandt; J. C. Niemeyer

2003-12-08T23:59:59.000Z

180

Flame Evolution During Type Ia Supernovae and the Deflagration Phase in the Gravitationally Confined Detonation Scenario  

E-Print Network (OSTI)

We develop an improved method for tracking the nuclear flame during the deflagration phase of a Type Ia supernova, and apply it to study the variation in outcomes expected from the gravitationally confined detonation (GCD) paradigm. A simplified 3-stage burning model and a non-static ash state are integrated with an artificially thickened advection-diffusion-reaction (ADR) flame front in order to provide an accurate but highly efficient representation of the energy release and electron capture in and after the unresolvable flame. We demonstrate that both our ADR and energy release methods do not generate significant acoustic noise, as has been a problem with previous ADR-based schemes. We proceed to model aspects of the deflagration, particularly the role of buoyancy of the hot ash, and find that our methods are reasonably well-behaved with respect to numerical resolution. We show that if a detonation occurs in material swept up by the material ejected by the first rising bubble but gravitationally confined to the white dwarf (WD) surface (the GCD paradigm), the density structure of the WD at detonation is systematically correlated with the distance of the deflagration ignition point from the center of the star. Coupled to a suitably stochastic ignition process, this correlation may provide a plausible explanation for the variety of nickel masses seen in Type Ia Supernovae.

D. M. Townsley; A. C. Calder; S. M. Asida; I. R. Seitenzahl; F. Peng; N. Vladimirova; D. Q. Lamb; J. W. Truran

2007-06-07T23:59:59.000Z

Note: This page contains sample records for the topic "ti ia al" 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

Flame-driven deflagration-to-detonation transitions in Type Ia supernovae?  

E-Print Network (OSTI)

Although delayed detonation models of thermonuclear explosions of white dwarfs seem promising for reproducing Type Ia supernovae, the transition of the flame propagation mode from subsonic deflagration to supersonic detonation remains hypothetical. A potential instant for this transition to occur is the onset of the distributed burning regime, i.e. the moment when turbulence first affects the internal flame structure. Some studies of the burning microphysics indicate that a deflagration-to-detonation transition may be possible here, provided the turbulent intensities are strong enough. Consequently, the magnitude of turbulent velocity fluctuations generated by the deflagration flame is analyzed at the onset of the distributed burning regime in several three-dimensional simulations of deflagrations in thermonuclear supernovae. It is shown that the corresponding probability density functions fall off towards high turbulent velocity fluctuations much more slowly than a Gaussian distribution. Thus, values claimed to be necessary for triggering a detonation are likely to be found in sufficiently large patches of the flame. Although the microphysical evolution of the burning is not followed and a successful deflagration-to-detonation transition cannot be guaranteed from simulations presented here, the results still indicate that such events may be possible in Type Ia supernova explosions.

F. K. Roepke

2007-09-26T23:59:59.000Z

182

ALS Chemistry Lab  

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

ALS Chemistry Lab Print ALS Chemistry Labs The ALS Chemistry Labs are located in the User Support Building (15-130) and in Building 6 (6-2233)*. These spaces are dedicated for...

183

ALS superbend magnet system  

E-Print Network (OSTI)

ALS Superbend Magnet System J. Zbasnik † , S. T. Wang †† ,of a High-Field Magnet for the ALS,” Transactions AppliedRefrigeration options for the ALS Superbend dipole magnets”,

2000-01-01T23:59:59.000Z

184

Access to the ALS  

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

Gate Access Access to the ALS Print User Access The ALS experiment floor (Building 6) is a Controlled Access Area for radiation protection. All ALS users are required to register...

185

ALS Longitudinal Kicker  

E-Print Network (OSTI)

be published in the Proceedings ALS Longitudinal Kickers F.IJ3Ir-33088 lE93 005961 ALS Longitudinul Kickers* F. VoelkerContract No. DE-AC03-76SFOOO98. ALS LONGITUDINAL KICKERS F.

Voelkner, F.

2011-01-01T23:59:59.000Z

186

ALS superbend magnet performance  

E-Print Network (OSTI)

ALS Superbend Magnet Performance S. Marks, J. Zbasnik, W.the Advanced Light Source (ALS), with the fourth magnet as ahe Advanced Light Source (ALS) at the Lawrence Berkeley

2001-01-01T23:59:59.000Z

187

Verifying the Cosmological Utility of Type Ia Supernovae:Implications of a Dispersion in the Ultraviolet Spectra  

SciTech Connect

We analyze the mean rest-frame ultraviolet (UV) spectrum ofType Ia Supernovae(SNe) and its dispersion using high signal-to-noiseKeck-I/LRIS-B spectroscopyfor a sample of 36 events at intermediateredshift (z=0.5) discoveredby the Canada-France-Hawaii TelescopeSupernova Legacy Survey (SNLS). Weintroduce a new method for removinghost galaxy contamination in our spectra,exploiting the comprehensivephotometric coverage of the SNLS SNe and theirhost galaxies, therebyproviding the first quantitative view of the UV spectralproperties of alarge sample of distant SNe Ia. Although the mean SN Ia spectrumhas notevolved significantly over the past 40 percent of cosmic history,preciseevolutionary constraints are limited by the absence of acomparable sample ofhigh quality local spectra. The mean UV spectrum ofour z 0.5 SNe Ia and itsdispersion is tabulated for use in futureapplications. Within the high-redshiftsample, we discover significant UVspectral variations and exclude dust extinctionas the primary cause byexamining trends with the optical SN color. Although progenitormetallicity may drive some of these trends, the variations we see aremuchlarger than predicted in recent models and do not follow expectedpatterns.An interesting new result is a variation seen in the wavelengthof selected UVfeatures with phase. We also demonstrate systematicdifferences in the SN Iaspectral features with SN lightcurve width inboth the UV and the optical. Weshow that these intrinsic variations couldrepresent a statistical limitation in thefuture use of high-redshift SNeIa for precision cosmology. We conclude thatfurther detailed studies areneeded, both locally and at moderate redshift wherethe rest-frame UV canbe studied precisely, in order that future missions canconfidently beplanned to fully exploit SNe Ia as cosmological probes.

Ellis, R.S.; Sullivan, M.; Nugent, P.E.; Howell, D.A.; Gal-Yam,A.; Astier, P.; Balam, D.; Balland, C.; Basa, S.; Carlberg, R.G.; Conley,A.; Fouchez, D.; Guy, J.; Hardin, D.; Hook, I.; Pain, R.; Perrett, K.; Pritchet, C.J.; Regnault, N.

2007-11-02T23:59:59.000Z

188

2012 ALS User Meeting  

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

2012 ALS User Meeting 2012 ALS User Meeting Print Tuesday, 14 June 2011 12:37 user meeting web banner Home Agenda Awards Exhibitors Lodging Posters Registration Transportation...

189

Al,N  

Science Conference Proceedings (OSTI)

Presentation Title, Significantly Bandgap-reduced and Enhanced PEC Response of Al and N Co-doped ZnO:(Al,N) Films for Solar Driven Hydrogen Production.

190

ALS Users' Association Charter  

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

organized framework for the interaction between those who use the Advanced Light Source (ALS) at the Lawrence Berkeley Laboratory (LBL) for their research and the ALS management,...

191

ALS Beamlines Directory  

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

Parameters, Contact Information, and Schedules Download a high-resolution version of the ALS Beamclock. See Beamclock to view the ALS energy-related beamlines beamclock. Beamline...

192

Transfer of TiN/Ti/Ag metallization research  

Science Conference Proceedings (OSTI)

A simple technology for manufacturing extremely stable silicon solar cells is described. The process uses a sputtering technique to reactively deposit high quality TiN films to be used as diffusion barrier layers in metallization systems. The deposition parameters have been optimized to yield films with low-stress and with resistivities as low as 50..mu.. ohm-cm. The TiN films act as an excellent metal diffusion barrier layer below the contact grid-lines, and also upon controlled oxidation as a good anti-reflection coating of TiO/sub 2/ in the active area of the solar cell. Such a unique and dual application of the TiN layer considerably simplifies the fabrication of the cells. Cells so prepared are found to be stable with no degradation in their electrical performance after heat treatments up to 600/sup 0/C for 15 minutes. The application of TiN films in obtaining stable ohmic contacts to GaAs has also been investigated. Ohmic contacts to p-type GaAs have been formed with GaAs/Pt(mG)/TiN/Ag system, which possess low contact resistivity stable up to 550/sup 0/C heat treatments.

Tandon, J.

1986-05-01T23:59:59.000Z

193

Neutron Diffraction Residual Strain Tensor Measurements Within The Phase IA Weld Mock-up Plate P-5  

SciTech Connect

Oak Ridge National Laboratory (ORNL) has worked with NRC and EPRI to apply neutron and X-ray diffraction methods to characterize the residual stresses in a number of dissimilar metal weld mockups and samples. The design of the Phase IA specimens aimed to enable stress measurements by several methods and computational modeling of the weld residual stresses. The partial groove in the 304L stainless steel plate was filled with weld beads of Alloy 82. A summary of the weld conditions for each plate is provided in Table 1. The plates were constrained along the long edges during and after welding by bolts with spring-loaded washers attached to the 1-inch thick Al backing plate. The purpose was to avoid stress relief due to bending of the welded stainless steel plate. The neutron diffraction method was one of the methods selected by EPRI for non-destructive through thickness strain and stress measurement. Four different plates (P-3 to P-6) were studied by neutron diffraction strain mapping, representing four different welding conditions. Through thickness neutron diffraction strain mappings at NRSF2 for the four plates and associated strain-free d-zero specimens involved measurement along seven lines across the weld and at six to seven depths. The mountings of each plate for neutron diffraction measurements were such that the diffraction vector was parallel to each of the three primary orthogonal directions of the plate: two in-plane directions, longitudinal and transverse, and the direction normal to the plate (shown in left figure within Table 1). From the three orthogonal strains for each location, the residual stresses along the three plate directions were calculated. The principal axes of the strain and stress tensors, however, need not necessarily align with the plate coordinate system. To explore this, plate P-5 was selected for examination of the possibility that the principal axes of strain are not along the sample coordinate system axes. If adequate data could be collected the goal would be to determine the strain tensor's orientation and magnitude of strain along each principle axis direction.

Hubbard, Camden R [ORNL

2011-09-01T23:59:59.000Z

194

Early and late time VLT spectroscopy of SN 2001el - progenitor constraints for a type Ia supernova  

E-Print Network (OSTI)

We present early time high-resolution (VLT/UVES) and late time low-resolution (VLT/FORS) optical spectra of the normal type Ia supernova, SN 2001el. The high-resolution spectra were obtained at -9 and -2 days to allow the detection of narrow hydrogen and/or helium emission lines from the circumstellar medium of the SN. No such lines were detected, and we therefore use photoionisation models to derive upper limits of 9x10^-6 Msun/yr and 5x10^-5 Msun/yr for the mass loss rate from the progenitor system assuming velocities of 10 km/s and 50 km/s, respectively, for a wind extending to outside at least a few x 10^15 cm away from the SN explosion site. These limits exclude a symbiotic star in the upper mass loss rate regime from being the progenitor of SN 2001el. The low resolution spectrum was obtained in the nebular phase of the SN, 400 days after the maximum light, to search for any hydrogen rich gas originating from the SN progenitor system. However, we see no signs of Balmer lines in our spectrum. Therefore, we model the late time spectra to derive an upper limit of ~0.03 Msun for solar abundance material present at velocities lower than 1000 km/s within the SN explosion site. According to simulations of Marietta et al. (2000) this is less than the expected mass lost by a subgiant, red giant or main sequence secondary star at a small binary separation as a result of the SN explosion. Finally, we discuss the origin of high velocity Ca II lines. We see both the CaII IR triplet and the H&K lines in the -9 days spectrum at a very high velocity of up to 34000 km/s. The spectrum also shows a flat-bottomed Si II `6150 A' feature similar to the one previously observed in SN 1990N at -14 days. We compare these spectral features to those observed in SNe 1984A and 1990N at even higher velocities.

S. Mattila; P. Lundqvist; J. Sollerman; C. Kozma; E. Baron; C. Fransson; B. Leibundgut; K. Nomoto

2005-01-20T23:59:59.000Z

195

XAFS Study of Epitaxial CoxTi1-xO?-x Anatase  

SciTech Connect

Co doped TiO?-anatase is a promising candidate for a room-temperature ferromagnetic semiconductor. XAFS measurements have been used to investigate the local Co environment and Co valence for several Co-anatase films. The samples were grown on LaAlO?(001) by oxygen plasma assisted molecular beam epitaxy and on SrTiO? by atomic oxygen assisted MBE. Co concentrations were about 5%. The measurements were made at the PNC-CAT bending magnet and undulator beamlines at the Advanced Photon Source. For the films on LaAlO?, the near edge clearly shows the presence of only Co(??), and no evidence for metallic Co, while the films on SrTiO? showed significant metallic Co. Analysis of the extended fine structure for the LaAlO? films finds that the Co substitutes for Ti with some distortion of the lattice. Both in-plane and out-of-plane Co-O bonds are expanded from the Ti-O bonds in anatase. The in-plane bonds are expanded approximately twice as much. A deficit in the oxygen coordination number suggests a correlation of oxygen vacancies with Co sites.

Heald, Steve M.; Chambers, Scott A.; Droubay, Timothy

2005-01-01T23:59:59.000Z

196

A Precision Photometric Comparison between SDSS-II and CSP Type Ia Supernova Data  

Science Conference Proceedings (OSTI)

Consistency between Carnegie Supernova Project (CSP) and SDSS-II Supernova Survey ugri measurements has been evaluated by comparing Sloan Digital Sky Survey (SDSS) and CSP photometry for nine spectroscopically confirmed Type Ia supernova observed contemporaneously by both programs. The CSP data were transformed into the SDSS photometric system. Sources of systematic uncertainty have been identified, quantified, and shown to be at or below the 0.023 mag level in all bands. When all photometry for a given band is combined, we find average magnitude differences of equal to or less than 0.011 mag in ugri, with rms scatter ranging from 0.043 to 0.077 mag. The u-band agreement is promising, with the caveat that only four of the nine supernovae are well observed in u and these four exhibit an 0.038 mag supernova-to-supernova scatter in this filter.

Mosher, J.; /Pennsylvania U.; Sako, M.; /Pennsylvania U.; Corlies, L.; /Pennsylvania U. /Columbia U.; Folatelli, G.; /Tokyo U. /Carnegie Inst. Observ.; Frieman, J.; /Chicago U., KICP /Chicago U., Astron. Astrophys. Ctr.; Holtzman, J.; /New Mexico State U.; Jha, S.W.; /Rutgers U., Piscataway; Kessler, R.; /Chicago U., Astron. Astrophys. Ctr. /Chicago U., KICP; Marriner, J.; /Fermilab; Phillips, M.M.; /Carnegie Inst. Observ.; Stritzinger, M.; /Aarhus U. /Stockholm U., OKC /Bohr Inst. /Carnegie Inst. Observ.

2012-06-01T23:59:59.000Z

197

A PRECISION PHOTOMETRIC COMPARISON BETWEEN SDSS-II AND CSP TYPE Ia SUPERNOVA DATA  

SciTech Connect

Consistency between Carnegie Supernova Project (CSP) and SDSS-II Supernova Survey ugri measurements has been evaluated by comparing Sloan Digital Sky Survey (SDSS) and CSP photometry for nine spectroscopically confirmed Type Ia supernova observed contemporaneously by both programs. The CSP data were transformed into the SDSS photometric system. Sources of systematic uncertainty have been identified, quantified, and shown to be at or below the 0.023 mag level in all bands. When all photometry for a given band is combined, we find average magnitude differences of equal to or less than 0.011 mag in ugri, with rms scatter ranging from 0.043 to 0.077 mag. The u-band agreement is promising, with the caveat that only four of the nine supernovae are well observed in u and these four exhibit an 0.038 mag supernova-to-supernova scatter in this filter.

Mosher, J.; Sako, M.; Corlies, L. [Department of Physics and Astronomy, University of Pennsylvania, 209 South 33rd Street, Philadelphia, PA 19104 (United States); Folatelli, G. [Institute for the Physics and Mathematics of the Universe (IPMU), University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8583 (Japan); Frieman, J.; Kessler, R. [Department of Astronomy and Astrophysics, University of Chicago, 5640 South Ellis Avenue, Chicago, IL 60637 (United States); Holtzman, J. [Department of Astronomy, MSC 4500, New Mexico State University, P.O. Box 30001, Las Cruces, NM 88003 (United States); Jha, S. W. [Department of Physics and Astronomy, Rutgers, the State University of New Jersey, 136 Frelinghuysen Road, Piscataway, NJ 08854 (United States); Marriner, J. [Center for Particle Astrophysics, Fermi National Accelerator Laboratory, P.O. Box 500, Batavia, IL 60510 (United States); Phillips, M. M.; Morrell, N. [Las Campanas Observatory, Carnegie Observatories, Casilla 601, La Serena (Chile); Stritzinger, M. [Oskar Klein Centre for Cosmo Particle Physics, AlbaNova University Center, 106 91 Stockholm (Sweden); Schneider, D. P., E-mail: jmosher@sas.upenn.edu [Department of Astronomy and Astrophysics, Pennsylvania State University, 525 Davey Laboratory, University Park, PA 16802 (United States)

2012-07-15T23:59:59.000Z

198

A Precision Photometric Comparison between SDSS-II and CSP Type Ia Supernova Data  

E-Print Network (OSTI)

Consistency between Carnegie Supernova Project (CSP) and SDSS-II supernova (SN) survey ugri measurements has been evaluated by comparing SDSS and CSP photometry for nine spectroscopically confirmed Type Ia supernova observed contemporaneously by both programs. The CSP data were transformed into the SDSS photometric system. Sources of systematic uncertainty have been identified, quantified, and shown to be at or below the 0.023 magnitude level in all bands. When all photometry for a given band is combined, we find average magnitude differences of equal to or less than 0.011 magnitudes in ugri, with rms scatter ranging from 0.043 to 0.077 magnitudes. The u band agreement is promising, with the caveat that only four of the nine supernovae are well-observed in u and these four exhibit an 0.038 magnitude supernova-to-supernova scatter in this filter.

Mosher, J; Corlies, L; Folatelli, G; Frieman, J; Holtzman, J; Jha, S W; Kessler, R; Marriner, J; Phillips, M M; Stritzinger, M; Morrell, N; Schneider, D P

2012-01-01T23:59:59.000Z

199

Analysis of Reaction-Diffusion Systems for Flame Capturing in Type Ia Supernova Simulations  

E-Print Network (OSTI)

We present a study of numerical behavior of a thickened flame used in Flame Capturing (FC, Khokhlov (1995)) for tracking thin unresolved physical flames in deflagration simulations. We develop a steady-state procedure for calibrating the flame model used, and test it against analytical results. We observe numerical noises generated by original realization of the technique. Alternative artificial burning rates are discussed, which produce acceptably quiet flames. Two new quiet models are calibrated to yield required "flame" speed and width, and further studied in 2D and 3D setting. Landau-Darrieus type instabilities of the flames are observed. One model also shows significantly anisotropic propagation speed on the grid, both effects increasingly pronounced at larger matter expansion as a result of burning; this makes the model unacceptable for use in type Ia supernova simulations. Another model looks promising for use in flame capturing at fuel to ash density ratio of order 3 and below. That "Model B" yields f...

Zhiglo, Andrey V

2009-01-01T23:59:59.000Z

200

ASD(NII)/DoD CIO SUBJECT: Defense Industrial Base (DIB) Cyber Security/Information Assurance (CS/IA) Activities  

E-Print Network (OSTI)

directing the conduct of DIB CS/IA activities to protect unclassified DoD information, as defined in the Glossary, that transits or resides on unclassified DIB information systems and networks. 2. APPLICABILITY. This Instruction applies to OSD, the Military Departments, the Office of

unknown authors

2010-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "ti ia al" 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

EARLY RADIO AND X-RAY OBSERVATIONS OF THE YOUNGEST NEARBY TYPE Ia SUPERNOVA PTF 11kly (SN 2011fe)  

SciTech Connect

On 2011 August 24 (UT) the Palomar Transient Factory (PTF) discovered PTF11kly (SN 2011fe), the youngest and most nearby Type Ia supernova (SN Ia) in decades. We followed this event up in the radio (centimeter and millimeter bands) and X-ray bands, starting about a day after the estimated explosion time. We present our analysis of the radio and X-ray observations, yielding the tightest constraints yet placed on the pre-explosion mass-loss rate from the progenitor system of this supernova. We find a robust limit of M-dot {approx}<10{sup -8}(w/100 km s{sup -1}) M{sub sun} yr{sup -1} from sensitive X-ray non-detections, as well as a similar limit from radio data, which depends, however, on assumptions about microphysical parameters. We discuss our results in the context of single-degenerate models for SNe Ia and find that our observations modestly disfavor symbiotic progenitor models involving a red giant donor, but cannot constrain systems accreting from main-sequence or sub-giant stars, including the popular supersoft channel. In view of the proximity of PTF11kly and the sensitivity of our prompt observations, we would have to wait for a long time (a decade or longer) in order to more meaningfully probe the circumstellar matter of SNe Ia.

Horesh, Assaf; Kulkarni, S. R.; Carpenter, John; Kasliwal, Mansi M.; Ofek, Eran O. [Cahill Center for Astrophysics, California Institute of Technology, Pasadena, CA 91125 (United States); Fox, Derek B. [Astronomy and Astrophysics, Eberly College of Science, Pennsylvania State University, University Park, PA 16802 (United States); Quimby, Robert [IPMU, University of Tokyo, Kashiwanoha 5-1-5, Kashiwa-shi, Chiba (Japan); Gal-Yam, Avishay [Benoziyo Center for Astrophysics, Faculty of Physics, Weizmann Institute of Science, Rehovot 76100 (Israel); Cenko, S. Bradley [Department of Astronomy, University of California, Berkeley, CA 94720-3411 (United States); De Bruyn, A. G. [Netherlands Institute for Radio Astronomy (ASTRON), Postbus 2, NL-7990 AA Dwingeloo (Netherlands); Kamble, Atish; Wijers, Ralph A. M. J. [Center for Gravitation and Cosmology, University of Wisconsin, Milwaukee, WI 53211 (United States); Van der Horst, Alexander J. [Universities Space Research Association, NSSTC, Huntsville, AL 35805 (United States); Kouveliotou, Chryssa [Space Science Office, VP-62, NASA-Marshall Space Flight Center, Huntsville, AL 35805 (United States); Podsiadlowski, Philipp; Sullivan, Mark; Maguire, Kate [Department of Physics (Astrophysics), University of Oxford, Keble Road, Oxford OX1 3RH (United Kingdom); Howell, D. Andrew [Las Cumbres Observatory Global Telescope Network, Santa Barbara, CA 93117 (United States); Nugent, Peter E. [Computational Cosmology Center, Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, CA 94720 (United States); Gehrels, Neil [NASA-Goddard Space Flight Center, Greenbelt, MD 20771 (United States); and others

2012-02-10T23:59:59.000Z

202

Photometric Observations of the Type Ia SN 2002er in UGC 10743  

E-Print Network (OSTI)

Extensive light and colour curves for the Type Ia supernova SN 2002er are presented as part of the European Supernova Collaboration. We have collected UBVRI photometry from ten different telescopes covering the phases from 7 days before until 619 days after maximum light. Corrections for the different instrumental systems and the non-thermal spectrum of the supernova (S-corrections) have been applied. With the densely sampled light curves we can make detailed comparisons to other well-observed objects. SN 2002er most closely resembles SN 1996X after maximum, but clearly shows a different colour evolution before peak light and a stronger shoulder in V and R bands compared to other well-observed SNe Ia. In particular, the rise time appears to be longer than what is expected from rise-time vs.decline-rate relation. We use several methods to determine the reddening towards SN 2002er based on the colour evolution at near peak and at late phases. The uvoir (bolometric) light curve shows great similarity with SN 1996X, but also indications of a higher luminosity, longer rise time and a more pronounced shoulder 25 days past maximum. The interpretation of the light curves was done with two independent light curve codes. Both find that given the luminosity of SN 2002er the 56Ni mass exceeds 0.6 Msun with prefered values near 0.7 Msun. Uncertainties in the exact distance to SN 2002er are the most serious limitation of this measurement. The light curve modelling also indicates a high level of mixing of the nickel in the explosion of SN 2002er.

G. Pignata; F. Patat; S. Benetti; S. Blinnikov; W. Hillebrandt; R. Kotak; B. Leibundgut; P. A. Mazzali; P. Meikle; Y. Qiu; P. Ruiz-Lapuente; S. Smartt; E. Sorokina; M. Stritzinger; M. Stehle; M. Turatto; T. Marsh; F. Martin-Luis; N. McBride; J. Mendez; L. Morales-Rueda; D. Narbutis; R. Street

2004-08-12T23:59:59.000Z

203

NUCLEOSYNTHESIS IN TWO-DIMENSIONAL DELAYED DETONATION MODELS OF TYPE Ia SUPERNOVA EXPLOSIONS  

SciTech Connect

For the explosion mechanism of Type Ia supernovae (SNe Ia), different scenarios have been suggested. In these, the propagation of the burning front through the exploding white dwarf (WD) star proceeds in different modes, and consequently imprints of the explosion model on the nucleosynthetic yields can be expected. The nucleosynthetic characteristics of various explosion mechanisms are explored based on three two-dimensional explosion simulations representing extreme cases: a pure turbulent deflagration, a delayed detonation following an approximately spherical ignition of the initial deflagration, and a delayed detonation arising from a highly asymmetric deflagration ignition. Apart from this initial condition, the deflagration stage is treated in a parameter-free approach. The detonation is initiated when the turbulent burning enters the distributed burning regime. This occurs at densities around 10{sup 7} g cm{sup -3}-relatively low as compared to existing nucleosynthesis studies for one-dimensional spherically symmetric models. The burning in these multidimensional models is different from that in one-dimensional simulations as the detonation wave propagates both into unburned material in the high-density region near the center of a WD and into the low-density region near the surface. Thus, the resulting yield is a mixture of different explosive burning products, from carbon-burning products at low densities to complete silicon-burning products at the highest densities, as well as electron-capture products synthesized at the deflagration stage. Detailed calculations of the nucleosynthesis in all three models are presented. In contrast to the deflagration model, the delayed detonations produce a characteristic layered structure and the yields largely satisfy constraints from Galactic chemical evolution. In the asymmetric delayed detonation model, the region filled with electron capture species (e.g., {sup 58}Ni, {sup 54}Fe) is within a shell, showing a large off-set, above the bulk of {sup 56}Ni distribution, while species produced by the detonation are distributed more spherically.

Maeda, K. [Institute for the Physics and Mathematics of the Universe (IPMU), University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8583 (Japan); Roepke, F.K.; Fink, M.; Hillebrandt, W.; Travaglio, C. [Max-Planck-Institut fuer Astrophysik, Karl-Schwarzschild-Strasse 1, 85741 Garching (Germany); Thielemann, F.-K., E-mail: keiichi.maeda@ipmu.j [Department Physik, Universitaet Basel, CH-4056 Basel (Switzerland)

2010-03-20T23:59:59.000Z

204

Measurements of the Rate of Type Ia Supernovae at Redshift z < ~0.3 from the SDSS-II Supernova Survey  

Science Conference Proceedings (OSTI)

We present a measurement of the volumetric Type Ia supernova (SN Ia) rate based on data from the Sloan Digital Sky Survey II (SDSS-II) Supernova Survey. The adopted sample of supernovae (SNe) includes 516 SNe Ia at redshift z {approx}< 0.3, of which 270 (52%) are spectroscopically identified as SNe Ia. The remaining 246 SNe Ia were identified through their light curves; 113 of these objects have spectroscopic redshifts from spectra of their host galaxy, and 133 have photometric redshifts estimated from the SN light curves. Based on consideration of 87 spectroscopically confirmed non-Ia SNe discovered by the SDSS-II SN Survey, we estimate that 2.04{sub -0.95}{sup +1.61}% of the photometric SNe Ia may be misidentified. The sample of SNe Ia used in this measurement represents an order of magnitude increase in the statistics for SN Ia rate measurements in the redshift range covered by the SDSS-II Supernova Survey. If we assume a SN Ia rate that is constant at low redshift (z < 0.15), then the SN observations can be used to infer a value of the SN rate of r{sub V} = (2.69{sub -0.30-0.01}{sup +0.34+0.21}) x 10{sup -5} SNe yr{sup -1} Mpc{sup -3} (H{sub 0}/(70 km s{sup -1} Mpc{sup -1})){sup 3} at a mean redshift of {approx} 0.12, based on 79 SNe Ia of which 72 are spectroscopically confirmed. However, the large sample of SNe Ia included in this study allows us to place constraints on the redshift dependence of the SN Ia rate based on the SDSS-II Supernova Survey data alone. Fitting a power-law model of the SN rate evolution, r{sub V} (z) = A{sub p} x ((1+z)/(1+z{sub 0})){sup {nu}}, over the redshift range 0.0 < z < 0.3 with z{sub 0} = 0.21, results in A{sub p} = (3.43{sub -0.15}{sup +0.15}) x 10{sup -5} SNe yr{sup -1} Mpc{sup -3} (H{sub 0}/(70 km s{sup -1} Mpc{sup -1})){sup 3} and {nu} = 2.04{sub -0.89}{sup +0.90}.

Dilday, Benjamin; /Rutgers U., Piscataway /Chicago U. /KICP, Chicago; Smith, Mathew; /Cape Town U., Dept. Math. /Portsmouth U.; Bassett, Bruce; /Cape Town U., Dept. Math. /South African Astron. Observ.; Becker, Andrew; /Washington U., Seattle, Astron. Dept.; Bender, Ralf; /Munich, Tech. U. /Munich U. Observ.; Castander, Francisco; /Barcelona, IEEC; Cinabro, David; /Wayne State U.; Filippenko, Alexei V.; /UC, Berkeley; Frieman, Joshua A.; /Chicago U. /Fermilab; Galbany, Lluis; /Barcelona, IFAE; Garnavich, Peter M.; /Notre Dame U. /Stockholm U., OKC /Stockholm U.

2010-01-01T23:59:59.000Z

205

Resistance spot welding of Ti-6A1-4V alloy  

SciTech Connect

The effects of weld power, electrode force, electrode tip radius, and elapsed time between cleaning and welding on resistance spot welds in Ti-6Al-4V alloy were evaluated. The alloy is weldable by this technique, and a wide latitude can be taken in processing variables.

Jarboe, D.M.

1980-06-01T23:59:59.000Z

206

ALS Chemistry Lab  

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

Chemistry Lab Print ALS Chemistry Labs The ALS Chemistry Labs are located in the User Support Building (15-130) and in Building 6 (6-2233)*. These spaces are dedicated for...

207

ALS Staff Photo  

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

ALS Staff Photo Print On May 14, 2013, members of ALS staff posed for a group photo in front of the dome. A hi-res version can be downloaded here. The last staff photo was taken in...

208

ALS User Meeting  

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

ALS User Meeting Print Due to the current lapse of federal funding, Berkeley Lab Web sites, including ALS sites, are accessible, but may not be updated until Congress approves...

209

ALS User Meeting  

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

User Meeting ALS User Meeting Print Tuesday, 14 June 2011 12:37 Due to the current lapse of federal funding, Berkeley Lab Web sites, including ALS sites, are accessible, but may...

210

ALS User Meeting Archives  

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

ALS User Meeting Archives ALS User Meeting Archives Print Monday, 06 June 2011 09:25 Past User Meeting Agendas, Workshops, and Awards Year Agenda Workshops David A. Shirley...

211

111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111 us 20060200344Al  

E-Print Network (OSTI)

20060200344Al (19) United States (12) Patent Application Publication Kosek et al. (10) Pub. No.: US 2006) Inventors: Daniel A. Kosek, Missoula, MT (US); Robert Crawford Maher, Bozeman, MT (US) A method of reducing

Maher, Robert C.

212

Direct measurement of the $^{44}$Ti($\\alpha$,p) reaction of importance to supernovae, using reclaimed $^{44}$Ti  

E-Print Network (OSTI)

Direct measurement of the $^{44}$Ti($\\alpha$,p) reaction of importance to supernovae, using reclaimed $^{44}$Ti

CERN. Geneva; Lindroos, Mats; CERN. Geneva. ISOLDE and Neutron Time-of-Flight Experiments Committee; INTC

2007-01-01T23:59:59.000Z

213

Au/MxOy/TiO2 catalysts for CO oxidation: promotional effect of main-group, transition, and rare-earth metal oxide additives.  

SciTech Connect

Au/TiO2 catalysts are active for CO oxidation, but they suffer from high-temperature sintering of the gold particles, and few attempts have been made to promote or stabilize Au/TiO2. Our recent communication addressed these issues by loading gold onto Al2O3/TiO2 prepared via surface-sol-gel processing of Al(sec-OC4H9)3 on TiO2. In our current full paper, Au/Al2O3/TiO2 catalysts were prepared alternatively by thermal decomposition of Al(NO3)3 on TiO2 followed by loading gold, and the influences of the decomposition temperature and Al2O3 content were systematically surveyed. This facile method was subsequently extended to the preparation of a battery of metal oxide-modified Au/TiO2 catalysts virtually not reported. It was found that Au/TiO2 modified by CaO, NiO, ZnO, Ga2O3, Y2O3, ZrO2, La2O3, Pr2O3, Nd2O3, Sm2O3, Eu2O3, Gd2O3, Dy2O3, Ho2O3, Er2O3, or Yb2O3 could retain significant activity at ambient temperature even after aging in O2-He at 500 C, whereas unmodified Au/TiO2 lost its activity. Moreover, some 200 C-calcined promoted catalysts showed high activity even at about -100 C. The deactivation and regeneration of some of these new catalysts were studied. This work furnished novel catalysts for further fundamental and applied research.

Ma, Zhen [ORNL; Overbury, Steven {Steve} H [ORNL; Dai, Sheng [ORNL

2007-01-01T23:59:59.000Z

214

A Measurement of the Rate of Type Ia Supernovae in Galaxy Clusters from the SDSS-II Supernova Survey  

Science Conference Proceedings (OSTI)

We present measurements of the Type Ia supernova (SN) rate in galaxy clusters based on data from the Sloan Digital Sky Survey-II (SDSS-II) Supernova Survey. The cluster SN Ia rate is determined from 9 SN events in a set of 71 C4 clusters at z {le} 0.17 and 27 SN events in 492 maxBCG clusters at 0.1 {le} z {le} 0.3. We find values for the cluster SN Ia rate of (0.37{sub -0.12-0.01}{sup +0.17+0.01}) SNur h{sup 2} and (0.55{sub -0.11-0.01}{sup +0.13+0.02}) SNur h{sup 2} (SNux = 10{sup -12}L{sub x{circle_dot}}{sup -1} yr{sup -1}) in C4 and maxBCG clusters, respectively, where the quoted errors are statistical and systematic, respectively. The SN rate for early-type galaxies is found to be (0.31{sub -0.12-0.01}{sup +0.18+0.01}) SNur h{sup 2} and (0.49{sub -0.11-0.01}{sup +0.15+0.02}) SNur h{sup 2} in C4 and maxBCG clusters, respectively. The SN rate for the brightest cluster galaxies (BCG) is found to be (2.04{sub -1.11-0.04}{sup +1.99+0.07}) SNur h{sup 2} and (0.36{sub -0.30-0.01}{sup +0.84+0.01}) SNur h{sup 2} in C4 and maxBCG clusters, respectively. The ratio of the SN Ia rate in cluster early-type galaxies to that of the SN Ia rate in field early-type galaxies is 1.94{sub -0.91-0.015}{sup +1.31+0.043} and 3.02{sub -1.03-0.048}{sup +1.31+0.062}, for C4 and maxBCG clusters, respectively. The SN rate in galaxy clusters as a function of redshift, which probes the late time SN Ia delay distribution, shows only weak dependence on redshift. Combining our current measurements with previous measurements, we fit the cluster SN Ia rate data to a linear function of redshift, and find r{sub L} = [(0.49{sub -0.14}{sup +0.15}) + (0.91{sub -0.81}{sup +0.85}) x z] SNuB h{sup 2}. A comparison of the radial distribution of SNe in cluster to field early-type galaxies shows possible evidence for an enhancement of the SN rate in the cores of cluster early-type galaxies. With an observation of at most 3 hostless, intra-cluster SNe Ia, we estimate the fraction of cluster SNe that are hostless to be (9.4{sub -5.1}{sup +8.3})%.

Dilday, Benjamin; /Rutgers U., Piscataway /Chicago U. /KICP, Chicago; Bassett, Bruce; /Cape Town U., Dept. Math. /South African Astron. Observ.; Becker, Andrew; /Washington U., Seattle, Astron. Dept.; Bender, Ralf; /Munich, Tech. U. /Munich U. Observ.; Castander, Francisco; /Barcelona, IEEC; Cinabro, David; /Wayne State U.; Frieman, Joshua A.; /Chicago U. /Fermilab; Galbany, Lluis; /Barcelona, IFAE; Garnavich, Peter; /Notre Dame U.; Goobar, Ariel; /Stockholm U., OKC /Stockholm U.; Hopp, Ulrich; /Munich, Tech. U. /Munich U. Observ. /Tokyo U.

2010-03-01T23:59:59.000Z

215

Prospects for Type Ia Supernova explosion mechanism identification with gamma rays  

E-Print Network (OSTI)

The explosion mechanism associated with thermonuclear supernovae (SNIa) is still a matter of debate. There is a wide agreement that high amounts of of radioactive nuclei are produced during these events and they are expected to be strong gamma-ray emitters. In the past, several authors have investigated the use of this gamma-ray emission as a diagnostic tool. In this paper we have done a complete study of the gamma-ray spectra associated with all the different scenarios currently proposed. This includes detonation, delayed detonation, deflagration and the off-center detonation. We have performed accurate simulations for this complete set of models in order to determine the most promising spectral features that could be used to discriminate among the different models. Our study is not limited to qualitative arguments. Instead, we have quantified the differences among the spectra and established distance limits for their detection. The calculations have been performed considering the best current response estimations of the SPI and IBIS instruments aboard INTEGRAL in such a way that our results can be used as a guideline to evaluate the capabilities of INTEGRAL in the study of type Ia supernovae. For the purpose of completeness we have also investigated the nuclear excitation and spallation reactions as a possible secondary source of gamma-rays present in some supernova scenarios. We conclude that this mechanism can be neglected due to its small contribution.

Jordi Gomez-Gomar; Jordi Isern; Pierre Jean

1997-09-05T23:59:59.000Z

216

EVALUATING SYSTEMATIC DEPENDENCIES OF TYPE Ia SUPERNOVAE: THE INFLUENCE OF CENTRAL DENSITY  

SciTech Connect

We present a study exploring a systematic effect on the brightness of Type Ia supernovae using numerical models that assume the single-degenerate paradigm. Our investigation varied the central density of the progenitor white dwarf at flame ignition, and considered its impact on the explosion yield, particularly the production and distribution of radioactive {sup 56}Ni, which powers the light curve. We performed a suite of two-dimensional simulations with randomized initial conditions, allowing us to characterize the statistical trends that we present. The simulations indicate that the production of Fe-group material is statistically independent of progenitor central density, but the mass of stable Fe-group isotopes is tightly correlated with central density, with a decrease in the production of {sup 56}Ni at higher central densities. These results imply that progenitors with higher central densities produce dimmer events. We provide details of the post-explosion distribution of {sup 56}Ni in the models, including the lack of a consistent centrally located deficit of {sup 56}Ni, which may be compared to observed remnants. By performing a self-consistent extrapolation of our model yields and considering the main-sequence lifetime of the progenitor star and the elapsed time between the formation of the white dwarf and the onset of accretion, we develop a brightness-age relation that improves our prediction of the expected trend for single degenerates and we compare this relation with observations.

Krueger, Brendan K.; Jackson, Aaron P.; Calder, Alan C. [Department of Physics and Astronomy, State University of New York-Stony Brook, Stony Brook, NY (United States); Townsley, Dean M. [Department of Physics and Astronomy, University of Alabama, Tuscaloosa, AL (United States); Brown, Edward F. [Department of Physics and Astronomy, Michigan State University, East Lansing, MI (United States); Timmes, Francis X., E-mail: brendan.krueger@stonybrook.edu [Joint Institute for Nuclear Astrophysics, Notre Dame, IN (United States)

2012-10-01T23:59:59.000Z

217

Phenomenology for Supernova Ia Data Based on a New Cosmic Time  

E-Print Network (OSTI)

A new phenomenological theory for the expansion of our universe is presented. Because fundamental supporting theory is still in development, its discussion is not presented in this paper. The theory is based on a new algebraic expression for cosmic time G Rho t^2=3/32Pi, which correctly predicts the WMAP measured cosmological constants and the fundamental Hubble parameter H(t) for the expansion of the universe. A replacement for dark matter, called here "dark mass", is proposed which scales as with the expansion and incorporated. It does not react with ordinary matter, except gravitationally, and produces flat rotational curves for spiral galaxies. Also a new expression for the approaching velocity of radiation in a closed 3-sphere expanding universe is given that accounts for the early degrading negative approach of radiation for z > 1.7. The expression is v = Hr-c. Combining these three elements produces a luminosity distance dL that successfully predicts the apparent magnitude of exploding supernova Ia stars and even the new gamma ray bursts with no need for dark energy or acceleration of the expansion of the universe.

Charles B. Leffert

2007-07-26T23:59:59.000Z

218

HIGH-RESOLUTION SIMULATIONS OF CONVECTION PRECEDING IGNITION IN TYPE Ia SUPERNOVAE USING ADAPTIVE MESH REFINEMENT  

E-Print Network (OSTI)

We extend our previous three-dimensional, full-star simulations of the final hours of convection preceding ignition in Type Ia supernovae to higher resolution using the adaptive mesh refinement capability of our low Mach number code, MAESTRO. We report the statistics of the ignition of the first flame at an effective 4.34 km resolution and general flow field properties at an effective 2.17 km resolution. We find that off-center ignition is likely, with radius of 50 km most favored and a likely range of 40–75 km. This is consistent with our previous coarser (8.68 km resolution) simulations, implying that we have achieved sufficient resolution in our determination of likely ignition radii. The dynamics of the last few hot spots preceding ignition suggest that a multiple ignition scenario is not likely. With improved resolution, we can more clearly see the general flow pattern in the convective region, characterized by a strong outward plume with a lower speed recirculation. We show that the convective core is turbulent with a Kolmogorov spectrum and has a lower turbulent intensity and larger integral length scale than previously thought (on the order of 16 km s?1 and 200 km, respectively), and we discuss the potential consequences for the first flames. Key words: convection – hydrodynamics – methods: numerical – nuclear reactions, nucleosynthesis, abundances – supernovae: general – white dwarfs Online-only material: color figures 1.

A. Nonaka; A. J. Aspden; M. Zingale; A. S. Almgren; J. B. Bell; S. E. Woosley

2012-01-01T23:59:59.000Z

219

Direct numerical simulations of type Ia supernovae flames II: The Rayleigh-Taylor instability  

Science Conference Proceedings (OSTI)

A Type Ia supernova explosion likely begins as a nuclear runaway near the center of a carbon-oxygen white dwarf. The outward propagating flame is unstable to the Landau-Darrieus, Rayleigh-Taylor, and Kelvin-Helmholtz instabilities, which serve to accelerate it to a large fraction of the speed of sound. We investigate the Rayleigh-Taylor unstable flame at the transition from the flamelet regime to the distributed-burning regime, around densities of 10e7 gm/cc, through detailed, fully resolved simulations. A low Mach number, adaptive mesh hydrodynamics code is used to achieve the necessary resolution and long time scales. As the density is varied, we see a fundamental change in the character of the burning--at the low end of the density range the Rayleigh-Taylor instability dominates the burning, whereas at the high end the burning suppresses the instability. In all cases, significant acceleration of the flame is observed, limited only by the size of the domain we are able to study. We discuss the implications of these results on the potential for a deflagration to detonation transition.

Bell, J.B.; Day, M.S.; Rendleman, C.A.; Woosley, S.E.; Zingale, M.

2004-01-12T23:59:59.000Z

220

Constraining deflagration models of Type Ia supernovae through intermediate-mass elements  

E-Print Network (OSTI)

The physical structure of a nuclear flame is a basic ingredient of the theory of Type Ia supernovae (SNIa). Assuming an exponential density reduction with several characteristic times we have followed the evolution of a planar nuclear flame in an expanding background from an initial density 6.6 10^7 g/cm3 down to 2 10^6 g/cm3. The total amount of synthesized intermediate-mass elements (IME), from silicon to calcium, was monitored during the calculation. We have made use of the computed mass fractions, X_IME, of these elements to give an estimation of the total amount of IME synthesized during the deflagration of a massive white dwarf. Using X_IME and adopting the usual hypothesis that turbulence decouples the effective burning velocity from the laminar flame speed, so that the relevant flame speed is actually the turbulent speed on the integral length-scale, we have built a simple geometrical approach to model the region where IME are thought to be produced. It turns out that a healthy production of IME invol...

García-Senz, D; Cabezon, R M; Woosley, S E

2006-01-01T23:59:59.000Z

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221

Direct numerical simulations of type Ia supernovae flames I: The landau-darrieus instability  

SciTech Connect

Planar flames are intrinsically unstable in open domains due to the thermal expansion across the burning front--the Landau-Darrieus instability. This instability leads to wrinkling and growth of the flame surface, and corresponding acceleration of the flame, until it is stabilized by cusp formation. We look at the Landau-Darrieus in stability for C/O thermonuclear flames at conditions relevant to the late stages of a Type Ia supernova explosion. Two-dimensional direct numerical simulations of both single-mode and multi-mode perturbations using a low Mach number hydrodynamics code are presented. We show the effect of the instability on the flame speed as a function of both the density and domain size, demonstrate the existence of the small scale cutoff to the growth of the instability, and look for the proposed breakdown of the non-linear stabilization at low densities. The effects of curvature on the flame as quantified through measurements of the growth rate and computation of the corresponding Markstein number. While accelerations of a few percent are observed, they are too small to have any direct outcome on the supernova explosion.

Bell, J.B.; Day, M.S.; Rendleman, C.A.; Woosley, S.E.; Zingale, M.

2003-11-24T23:59:59.000Z

222

FLAMES IN TYPE Ia SUPERNOVA: DEFLAGRATION-DETONATION TRANSITION IN THE OXYGEN-BURNING FLAME  

Science Conference Proceedings (OSTI)

The flame in a Type Ia supernova is a conglomerate structure that, depending on density, may involve separate regions of carbon, oxygen, and silicon burning, all propagating in a self-similar, subsonic front. The separation between these three burning regions increases as the density declines until eventually, below about 2 x 10{sup 7} g cm{sup -3}, only carbon burning remains active, the other two burning phases having 'frozen out' on stellar scales. Between 2 and 3 x 10{sup 7} g cm{sup -3}, however, there remains an energetic oxygen-burning region that trails the carbon burning by an amount that is sensitive to the turbulence intensity. As the carbon flame makes a transition to the distributed regime (Karlovitz number {approx}> 10), the characteristic separation between the carbon- and oxygen-burning regions increases dramatically, from a fraction of a meter to many kilometers. The oxygen-rich mixture between the two flames is created at a nearly constant temperature, and turbulence helps to maintain islands of well-mixed isothermal fuel as the temperature increases. The delayed burning of these regions can be supersonic and could initiate a detonation.

Woosley, S. E. [Department of Astronomy and Astrophysics, University of California, Santa Cruz, CA 95064 (United States); Kerstein, A. R. [Combustion Research Facility, Sandia National Laboratories, Livermore, CA 94551 (United States); Aspden, A. J., E-mail: woosley@ucolick.org, E-mail: arkerst@sandia.gov, E-mail: ajaspden@lbl.gov [Center for Computational Sciences and Engineering, Lawrence Berkeley National Laboratory, CA 94720 (United States)

2011-06-10T23:59:59.000Z

223

TYPE Ia SUPERNOVAE: CALCULATIONS OF TURBULENT FLAMES USING THE LINEAR EDDY MODEL  

SciTech Connect

The nature of carbon burning flames in Type Ia supernovae is explored as they interact with Kolmogorov turbulence. One-dimensional calculations using the Linear Eddy Model of Kerstein elucidate three regimes of turbulent burning. In the simplest case, large-scale turbulence folds and deforms thin laminar flamelets to produce a flame brush with a total burning rate given approximately by the speed of turbulent fluctuations on the integral scale, U{sub L} , This is the regime where the supernova explosion begins and where most of its pre-detonation burning occurs. As the density declines, turbulence starts to tear the individual flamelets, making broader structures that move faster. For a brief time, these turbulent flamelets are still narrow compared to their spacing and the concept of a flame brush moving with an overall speed of U{sub L} remains valid. However, the typical width of the individual flamelets, which is given by the condition that their turnover time equals their burning time, continues to increase as the density declines. Eventually, mixed regions almost as large as the integral scale itself are transiently formed. At that point, a transition to detonation can occur. The conditions for such a transition are explored numerically and it is estimated that the transition will occur for densities near 1 x 10{sup 7} g cm{sup -3}, provided the turbulent speed on the integral scale exceeds about 20% sonic. An example calculation shows the details of a detonation actually developing.

Woosley, S. E. [Department of Astronomy and Astrophysics, University of California, Santa Cruz, CA 95064 (United States); Kerstein, A. R.; Sankaran, V. [Combustion Research Facility, Sandia National Laboratory, Livermore, CA 94551 (United States); Aspden, A. J. [Center for Computational Science and Engineering, Lawrence Berkeley National Laboratory, Berkeley, CA 94720 (United States); Roepke, F. K., E-mail: woosley@ucolick.or, E-mail: arkerst@sandia.go, E-mail: AJAspden@lbl.go, E-mail: fritz@mpa-Garching.mpg.d [Max Planck Institut fuer Astrophysik, Garching (Germany)

2009-10-10T23:59:59.000Z

224

ON THE NATURE OF THE PROGENITOR OF THE Type Ia SN2011fe IN M101  

SciTech Connect

The explosion of a Type Ia supernova, SN2011fe, in the nearby Pinwheel galaxy (M101 at 6.4 Mpc) provides an opportunity to study pre-explosion images and search for the progenitor, which should consist of a white dwarf (WD), possibly surrounded by an accretion disk, in orbit with another star. We report on our use of deep Chandra observations and Hubble Space Telescope observations to limit the luminosity and temperature of the pre-explosion WD. It is found that if the spectrum was a blackbody, then pre-SN WDs with steady nuclear burning of the highest possible temperatures and luminosities are excluded assuming moderate n{sub H} values, but values of kT between roughly 10 eV and 60 eV are permitted even if the WD was emitting at the Eddington luminosity. This allows the progenitor to be an accreting nuclear-burning WD with an expanded photosphere 4-100 times the WD itself, or a super-critically accreting WD blowing off an optically thick strong wind, or possibly a recurrent nova with luminosities an order of magnitude lower than Eddington. The observations are also consistent with a double degenerate scenario, or a spinning down WD that has been spun up by accretion from the donor.

Liu Jifeng [National Astronomical Observatory of China, Beijing 100012 (China); Di Stefano, Rosanne; Wang Tao; Moe, Maxwell [Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138 (United States)

2012-04-20T23:59:59.000Z

225

Capturing the Fire: Flame Energetics and Neutronizaton for Type Ia Supernova Simulations  

E-Print Network (OSTI)

We develop and calibrate a realistic model flame for hydrodynamical simulations of deflagrations in white dwarf (Type Ia) supernovae. Our flame model builds on the advection-diffusion-reaction model of Khokhlov and includes electron screening and Coulomb corrections to the equation of state in a self-consistent way. We calibrate this model flame--its energetics and timescales for energy release and neutronization--with self-heating reaction network calculations that include both these Coulomb effects and up-to-date weak interactions. The burned material evolves post-flame due to both weak interactions and hydrodynamic changes in density and temperature. We develop a scheme to follow the evolution, including neutronization, of the NSE state subsequent to the passage of the flame front. As a result, our model flame is suitable for deflagration simulations over a wide range of initial central densities and can track the temperature and electron fraction of the burned material through the explosion and into the expansion of the ejecta.

A. C. Calder; D. M. Townsley; I. R. Seitenzahl; F. Peng; O. E. B. Messer; N. Vladimirova; E. F. Brown; J. W. Truran; D. Q. Lamb

2006-11-01T23:59:59.000Z

226

Chirped-Pulse Amplification with flashlamp-pumped Ti:Sapphire amplifiers  

Science Conference Proceedings (OSTI)

Ti:Sapphire (Ti:Al{sub 2}O{sub 3}) amplifier stages are typically pumped with Q-switched Nd:YAG lasers doubled to 532 nm because of good spectral overlap, short temporal width, high repetition rate (i.e., 10 Hz to > 5 kHz) and the problems associated with flashlamp pumping a material with a relatively short upper state lifetime. Limitations to this pumping method arise due to the 1 to 1.5 joule/pulse ceiling found in most commercial high rep rate Nd:YAG lasers. The availability of high quality, large aperture Ti:Sapphire rods has made the flashlamp-pumping scheme an attractive option. The excellent thermal properties of Ti:Sapphire also allows an amplifier to be operated at high repetition rates. The front end of our laser relies on Chirped Pulse Amplification (CPA) in laser pumped Ti:Sapphire to generate 55 NJ, 90 fsec pulses at a 10 Hz rate. We report the use of a flashlamp pumped Ti:Sapphire head to further amplify the output of our system, producing 90 fsec, 250 NJ pulses at 5 Hz. The excellent output spatial profile yields a near diffraction-limited 5 {mu}m spot size and peak irradiance in excess of 5 {times} 10{sup 18} W/cm{sup 2}.

Bonlie, J.D.; White, W.E.; Price, D.F.; Reitze, D.H.

1994-01-01T23:59:59.000Z

227

The Joint Efficient Dark-energy Investigation (JEDI): Measuring the cosmic expansion history from type Ia supernovae  

E-Print Network (OSTI)

JEDI (Joint Efficient Dark-energy Investigation) is a candidate implementation of the NASA-DOE Joint Dark Energy Mission (JDEM). JEDI will probe dark energy in three independent methods: (1) type Ia supernovae, (2) baryon acoustic oscillations, and (3) weak gravitational lensing. In an accompanying paper, an overall summary of the JEDI mission is given. In this paper, we present further details of the supernova component of JEDI. To derive model-independent constraints on dark energy, it is important to precisely measure the cosmic expansion history, H(z), in continuous redshift bins from z \\~ 0-2 (the redshift range in which dark energy is important). SNe Ia at z > 1 are not readily accessible from the ground because the bulk of their light has shifted into the near-infrared where the sky background is overwhelming; hence a space mission is required to probe dark energy using SNe. Because of its unique near-infrared wavelength coverage (0.8-4.2 microns), JEDI has the advantage of observing SNe Ia in the rest frame J band for the entire redshift range of 0 energy are discussed, with special emphasis on the improved precision afforded by the rest frame near-infrared data.

M. M. Phillips; Peter Garnavich; Yun Wang; David Branch; Edward Baron; Arlin Crotts; J. Craig Wheeler; Edward Cheng; Mario Hamuy; for the JEDI Team

2006-06-28T23:59:59.000Z

228

A Measurement of the Rate of Type Ia Supernovae in Galaxy Clusters from the SDSS-II Supernova Survey  

E-Print Network (OSTI)

ABRIDGED We present measurements of the Type Ia supernova (SN) rate in galaxy clusters based on data from the Sloan Digital Sky Survey-II (SDSS-II) Supernova Survey. The cluster SN Ia rate is determined from 9 SN events in a set of 71 C4 clusters at z <0.17 and 27 SN events in 492 maxBCG clusters at 0.1 < z < 0.3$. We find values for the cluster SN Ia rate of $({0.37}^{+0.17+0.01}_{-0.12-0.01}) \\mathrm{SNu}r h^{2}$ and $({0.55}^{+0.13+0.02}_{-0.11-0.01}) \\mathrm{SNu}r h^{2}$ ($\\mathrm{SNu}x = 10^{-12} L_{x\\sun}^{-1} \\mathrm{yr}^{-1}$) in C4 and maxBCG clusters, respectively, where the quoted errors are statistical and systematic, respectively. The SN rate for early-type galaxies is found to be $({0.31}^{+0.18+0.01}_{-0.12-0.01}) \\mathrm{SNu}r h^{2}$ and $({0.49}^{+0.15+0.02}_{-0.11-0.01})$ $\\mathrm{SNu}r h^{2}$ in C4 and maxBCG clusters, respectively. The SN rate for the brightest cluster galaxies (BCG) is found to be $({2.04}^{+1.99+0.07}_{-1.11-0.04}) \\mathrm{SNu}r h^{2}$ and $({0.36}^{+0.84+0.01}_...

Dilday, Benjamin; Becker, Andrew; Bender, Ralf; Castander, Francisco; Cinabro, David; Frieman, Joshua A; Galbany, Lluís; Garnavich, Peter; Goobar, Ariel; Hopp, Ulrich; Ihara, Yutaka; Jha, Saurabh W; Kessler, Richard; Lampeitl, Hubert; Marriner, John; Miquel, Ramon; Mollá, Mercedes; Nichol, Robert C; Nordin, Jakob; Riess, Adam G; Sako, Masao; Schneider, Donald P; Smith, Mathew; Sollerman, Jesper; Wheeler, J Craig; Östman, Linda; Bizyaev, Dmitry; Brewington, Howard; Malanushenko, Elena; Malanushenko, Viktor; Oravetz, Dan; Pan, Kaike; Simmons, Audrey; Snedden, Stephanie

2010-01-01T23:59:59.000Z

229

The Rise and Fall of Type Ia Supernova Light Curves in the SDSS-II Supernova Survey  

Science Conference Proceedings (OSTI)

We analyze the rise and fall times of Type Ia supernova (SN Ia) light curves discovered by the Sloan Digital Sky Survey-II (SDSS-II) Supernova Survey. From a set of 391 light curves k-corrected to the rest-frame B and V bands, we find a smaller dispersion in the rising portion of the light curve compared to the decline. This is in qualitative agreement with computer models which predict that variations in radioactive nickel yield have less impact on the rise than on the spread of the decline rates. The differences we find in the rise and fall properties suggest that a single 'stretch' correction to the light curve phase does not properly model the range of SN Ia light curve shapes. We select a subset of 105 light curves well observed in both rise and fall portions of the light curves and develop a '2-stretch' fit algorithm which estimates the rise and fall times independently. We find the average time from explosion to B-band peak brightness is 17.38 {+-} 0.17 days, but with a spread of rise times which range from 13 days to 23 days. Our average rise time is shorter than the 19.5 days found in previous studies; this reflects both the different light curve template used and the application of the 2-stretch algorithm. The SDSS-II supernova set and the local SNe Ia with well-observed early light curves show no significant differences in their average rise-time properties. We find that slow-declining events tend to have fast rise times, but that the distribution of rise minus fall time is broad and single peaked. This distribution is in contrast to the bimodality in this parameter that was first suggested by Strovink (2007) from an analysis of a small set of local SNe Ia. We divide the SDSS-II sample in half based on the rise minus fall value, t{sub r} - t{sub f} {approx} 2 days, to search for differences in their host galaxy properties and Hubble residuals; we find no difference in host galaxy properties or Hubble residuals in our sample.

Hayden, Brian T.; /Notre Dame U.; Garnavich, Peter M.; /Notre Dame U.; Kessler, Richard; /KICP, Chicago /Chicago U., EFI; Frieman, Joshua A.; /KICP, Chicago /Chicago U. /Fermilab; Jha, Saurabh W.; /Stanford U., Phys. Dept. /Rutgers U., Piscataway; Bassett, Bruce; /Cape Town U., Dept. Math. /South African Astron. Observ.; Cinabro, David; /Wayne State U.; Dilday, Benjamin; /Rutgers U., Piscataway; Kasen, Daniel; /UC, Santa Cruz; Marriner, John; /Fermilab; Nichol, Robert C.; /Portsmouth U., ICG /Baltimore, Space Telescope Sci. /Johns Hopkins U.

2010-01-01T23:59:59.000Z

230

ALS User Meeting Archives  

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

and Mike Scheinfein (Arizona State University) for development of the PEEM2 photoemission electron microscope. to the members of the ALS User Services Office (Ruth Pepe, Bernie...

231

ALS Postdoctoral Fellowship Highlights  

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

Postdoctoral Fellowship Highlights Print Since its inception in 2005, the ALS Postdoctoral Fellowship program has supported young scientists in new and ongoing research projects at...

232

Howes et al. Reply  

E-Print Network (OSTI)

Howes et al. Reply to Comment on "Kinetic Simulations of Magnetized Turbulence in Astrophysical Plasmas" arXiv:0711.4355

Howes, G G; Dorland, W; Hammett, G W; Quataert, E; Schekochihin, A A; Tatsuno, T; 10.1103/PhysRevLett.101.149502

2008-01-01T23:59:59.000Z

233

ALS Users' Association Charter  

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

Users' Executive Committee ALS Users' Association Charter Print The purpose of the Advanced Light Source Users' Association (ALSUA) is to provide an organized framework for the...

234

ALS Postdoctoral Fellowship Program  

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

x-ray radiation for scientific and technological research. As the world's first third-generation synchrotron radiation source, the ALS offers outstanding performance in the...

235

Three-dimensional numerical simulations of Rayleigh-Taylorunstable flames in type Ia supernovae  

SciTech Connect

Flame instabilities play a dominant role in accelerating the burning front to a large fraction of the speed of sound in a Type Ia supernova. We present a three-dimensional numerical simulation of a Rayleigh-Taylor unstable carbon flame, following its evolution through the transition to turbulence. A low Mach number hydrodynamics method is used, freeing us from the harsh time step restrictions imposed by sound waves. We fully resolve the thermal structure of the flame and its reaction zone, eliminating the need for a flame model. A single density is considered, 1.5x107 gm/cc, and half carbon/half oxygen fuel--conditions under which the flame propagated in the flamelet regime in our related two-dimensional study. We compare to a corresponding two-dimensional simulation, and show that while fire-polishing keeps the small features suppressed in two dimensions, turbulence wrinkles the flame on far smaller scales in the three-dimensional case, suggesting that the transition to the distributed burning regime occurs at higher densities in three dimensions. Detailed turbulence diagnostics are provided. We show that the turbulence follows a Kolmogorov spectrum and is highly anisotropic on the large scales, with a much larger integral scale in the direction of gravity. Furthermore, we demonstrate that it becomes more isotropic as it cascades down to small scales. Based on the turbulent statistics and the flame properties of our simulation, we compute the Gibson scale. We show the progress of the turbulent flame through a classic combustion regime diagram, indicating that the flame just enters the distributed burning regime near the end of our simulation.

Zingale, M.; Woosley, S.E.; Rendleman, C.A.; Day, M.S.; Bell, J.B.

2005-01-28T23:59:59.000Z

236

Constraining deflagration models of Type Ia supernovae through intermediate-mass elements  

E-Print Network (OSTI)

The physical structure of a nuclear flame is a basic ingredient of the theory of Type Ia supernovae (SNIa). Assuming an exponential density reduction with several characteristic times we have followed the evolution of a planar nuclear flame in an expanding background from an initial density 6.6 10^7 g/cm3 down to 2 10^6 g/cm3. The total amount of synthesized intermediate-mass elements (IME), from silicon to calcium, was monitored during the calculation. We have made use of the computed mass fractions, X_IME, of these elements to give an estimation of the total amount of IME synthesized during the deflagration of a massive white dwarf. Using X_IME and adopting the usual hypothesis that turbulence decouples the effective burning velocity from the laminar flame speed, so that the relevant flame speed is actually the turbulent speed on the integral length-scale, we have built a simple geometrical approach to model the region where IME are thought to be produced. It turns out that a healthy production of IME involves the combination of not too short expansion times, t_c > 0.2 s, and high turbulent intensities. According to our results it could be difficult to produce much more than 0.2 solar masses of intermediate-mass elements within the deflagrative paradigma. The calculations also suggest that the mass of IME scales with the mass of Fe-peak elements, making it difficult to conciliate energetic explosions with low ejected nickel masses, as in the well observed SN1991bg or in SN1998de. Thus a large production of Si-peak elements, especially in combination with a low or a moderate production of iron, could be better addressed by either the delayed detonation route in standard Chandrasekhar-mass models or, perhaps, by the off-center helium detonation in the sub Chandrasekhar-mass scenario.

D. Garcia-Senz; E. Bravo; R. M. Cabezon; S. E. Woosley

2006-09-15T23:59:59.000Z

237

Science DMZ for ALS  

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

ALS ALS About ESnet Overview ESnet Staff Governance Our Network Case Studies OSCARS Case Studies Science DMZ Case Studies Science DMZ CU Science DMZ Penn State & VTTI Science DMZ NOAA Science DMZ NERSC Science DMZ ALS Multi-facility Workflow LCLS ESnet Strategic Plan ESnet Organizational Chart ESnet History Science Requirements Careers Contact Us Technical Assistance: 1 800-33-ESnet (Inside the US) 1 800-333-7638 (Inside the US) 1 510-486-7600 (Globally) 1 510-486-7607 (Globally) Report Network Problems: trouble@es.net Provide Web Site Feedback: info@es.net Science DMZ for ALS Many beamline scientists at Berkeley Lab's Advanced Light Source (ALS) are or will be experiencing slower network speeds because of instrument upgrades. These new instruments, or more specifically detectors, are

238

HVOF Thermal Spray TiC/TiB2 Coatings of AUSC Boiler/Turbine ...  

Science Conference Proceedings (OSTI)

The paper presents the research endeavors to synthesize TiC and TiB2 coatings on existing boiler materials for applications at high temperatures (500 -750 oC) ...

239

Pure rotational spectra of TiO and TiO_2 in VY Canis Majoris  

E-Print Network (OSTI)

We report the first detection of pure rotational transitions of TiO and TiO_2 at (sub-)millimeter wavelengths towards the red supergiant VY CMa. A rotational temperature, T_rot, of about 250 K was derived for TiO_2. Although T_rot was not well constrained for TiO, it is likely somewhat higher than that of TiO_2. The detection of the Ti oxides confirms that they are formed in the circumstellar envelopes of cool oxygen-rich stars and may be the "seeds" of inorganic-dust formation, but alternative explanations for our observation of TiO and TiO_2 in the cooler regions of the envelope cannot be ruled out at this time. The observations suggest that a significant fraction of the oxides is not converted to dust, but instead remains in the gas phase throughout the outflow.

Kaminski, T; Menten, K M; Patel, N A; Young, K H; Brunken, S; Muller, H S P; McCarthy, M C; Winters, J M; Decin, L

2013-01-01T23:59:59.000Z

240

Epitaxial growth of Ti{sub 3}SiC{sub 2} thin films with basal planes parallel or orthogonal to the surface on {alpha}-SiC  

SciTech Connect

The growth of Ti{sub 3}SiC{sub 2} thin films were studied onto {alpha}-SiC substrates differently oriented by thermal annealing of TiAl layers deposited by magnetron sputtering. For any substrate's orientation, transmission electron microscopy coupled with x-ray diffraction showed the coherent epitaxial growth of Ti{sub 3}SiC{sub 2} films along basal planes of SiC. Specifically for the (1120) 4H-SiC, Ti{sub 3}SiC{sub 2} basal planes are found to be orthogonal to the surface. The continuous or textured nature of Ti{sub 3}SiC{sub 2} films does not depend of the SiC stacking sequence and is explained by a step-flow mechanism of growth mode. The ohmic character of the contact was confirmed by current-voltage measurements.

Drevin-Bazin, A.; Barbot, J. F.; Alkazaz, M.; Cabioch, T.; Beaufort, M. F. [Institut Pprime, UPR 3346, CNRS-Universite de Poitiers-ENSMA, Departement de Physique et Mecanique des Materiaux, SP2MI, Teleport 2, Bd M. et P. Curie, BP 30179, F-86962 Futuroscope-Chasseneuil (France)

2012-07-09T23:59:59.000Z

Note: This page contains sample records for the topic "ti ia al" 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

Limits on the Time Variation of the Fermi Constant G_F Based on Type Ia Supernova Observations  

E-Print Network (OSTI)

The light curve of a type Ia supernova decays at a rate set by the beta-decay lifetimes of the Ni-56 and Co-56 produced in the explosion. This makes such a light curve sensitive to the value of the Fermi constant G_F at the time of the supernova. Using data from the CfA Supernova Archive, we measure the dependence of the light curve decay rate on redshift and place a bound on the time variation of G_F of |(dG_F/dt)/G_F| < 10^(-9) / y.

Ferrero, Alejandro

2010-01-01T23:59:59.000Z

242

ALS User Meeting Archives  

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

ALS User Meeting Archives ALS User Meeting Archives Past User Meeting Agendas, Workshops, and Awards Year Agenda Workshops David A. Shirley (Science) Klaus Halbach (Instrumentation) Tim Renner (Service) 2012 2012 User Meeting Agenda 2012 User Meeting Workshops 2012 ALS User Meeting Awards Carl Percival, Dudley Shallcross, Craig Taatjes and David Osborn (Sandia), for making the first direct measurements of the reactions of Criegee intermediates, and showing that their impact on tropospheric chemistry and climate may be substantially greater than previously assumed. 2012 ALS User Meeting Awards Jeff Dickert and Simon Morton of Berkeley Lab's Physical Biosciences Division for the invention and implementation of the Compact Variable Collimator (CVC), which has led to a dramatic increase in productivity of protein crystallography.

243

ALS Beamlines Directory  

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

ALS Beamlines Directory Print ALS Beamlines Directory Print Beamlines, Parameters, Contact Information, and Schedules Download a high-resolution version of the ALS Beamclock. See Beamclock to view the ALS energy-related beamlines beamclock. Beamline Parameters Beamline and endstation technical information is available through the links below. Unless otherwise noted, all beamlines are currently operational. Individual beamline schedules are posted when available. Please contact the responsible beamline scientist for additional schedule information. When calling from off-site, all beamline (BL) phone numbers that begin with a "2" are preceded by 495- (i.e., 495-2014); all others are preceded by 486-. Beamline Number Source Technique/ Group Name Energy Range Beamline Contact Schedule/BL Phone

244

ALS Beamlines Directory  

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

ALS Beamlines Directory Print ALS Beamlines Directory Print Beamlines, Parameters, Contact Information, and Schedules Download a high-resolution version of the ALS Beamclock. See Beamclock to view the ALS energy-related beamlines beamclock. Beamline Parameters Beamline and endstation technical information is available through the links below. Unless otherwise noted, all beamlines are currently operational. Individual beamline schedules are posted when available. Please contact the responsible beamline scientist for additional schedule information. When calling from off-site, all beamline (BL) phone numbers that begin with a "2" are preceded by 495- (i.e., 495-2014); all others are preceded by 486-. Beamline Number Source Technique/ Group Name Energy Range Beamline Contact Schedule/BL Phone

245

2012 ALS Open House  

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

House 2012 ALS Open House Print More than 6000 people came up the hill to see what is happening at Berkeley Lab during Open House on Saturday, October 13, and more than 1500 of...

246

ALS User Meeting  

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

Print Due to the current lapse of federal funding, Berkeley Lab Web sites, including ALS sites, are accessible, but may not be updated until Congress approves funds for Fiscal...

247

Type Ia Supernova Properties as a Function of the Distance to the Host Galaxy in the SDSS-II SN Survey  

E-Print Network (OSTI)

We use type-Ia supernovae (SNe Ia) discovered by the SDSS-II SN Survey to search for dependencies between SN Ia properties and the projected distance to the host galaxy center, using the distance as a proxy for local galaxy properties (local star-formation rate, local metallicity, etc.). The sample consists of almost 200 spectroscopically or photometrically confirmed SNe Ia at redshifts below 0.25. The sample is split into two groups depending on the morphology of the host galaxy. We fit light-curves using both MLCS2k2 and SALT2, and determine color (AV, c) and light-curve shape (delta, x1) parameters for each SN Ia, as well as its residual in the Hubble diagram. We then correlate these parameters with both the physical and the normalized distances to the center of the host galaxy and look for trends in the mean values and scatters of these parameters with increasing distance. The most significant (at the 4-sigma level) finding is that the average fitted AV from MLCS2k2 and c from SALT2 decrease with the proj...

Galbany, Lluis; Ostman, Linda; Brown, Peter J; Cinabro, David; D'Andrea, Chris B; Frieman, Joshua; Jha, Saurabh W; Marriner, John; Nichol, Robert C; Nordin, Jakob; Olmstead, Matthew D; Sako, Masao; Schneider, Donald P; Smith, Mathew; Sollerman, Jesper; Pan, Kaike; Snedden, Stephanie; Bizyaev, Dmitry; Brewington, Howard; Malanushenko, Elena; Malanushenko, Viktor; Oravetz, Dan; Simmons, Audrey; Shelden, Alaina

2012-01-01T23:59:59.000Z

248

TiBw-Reinforced Ti Composites: Processing, Properties, Application ...  

Science Conference Proceedings (OSTI)

Z. Fan et al., J. Mater. Sci., 29 (1994), pp. 1127–1134. 16. R. Boyer, G. Welsch and E.W. Collings, editors, Materials Properties Handbook: Titanium Alloys ...

249

Development of a Continuous Process to Produce Ti via ...  

Science Conference Proceedings (OSTI)

Presentation Title, Development of a Continuous Process to Produce Ti via Metallothermic Reduction of TiCl4 in Molten Salt. Author(s), David Steyn van Vuuren, ...

250

Fabrication of High Strength Pure Ti Matrix Composite Reinforced ...  

Science Conference Proceedings (OSTI)

Carbon black particles were added for the in situ formation of TiC dispersoids during the SPS process. Sponge and fine Ti powders were coated with carbon ...

251

TiC x N 1-x Eutectic Composite Prepared by  

Science Conference Proceedings (OSTI)

Presentation Title, Microstructure and Mechanical Property of TiB2-TiCxN1-x ... TiB2, TiC and TiN powders in N2 atmosphere at 60  ...

252

Optimization of Ti addition in Fe for Fe-Ti-N thin films  

Science Conference Proceedings (OSTI)

In this work we studied the magnetic and structural properties of Fe{sub 1-x}Ti{sub x}(x=0, 0.02, 0.05, 0.07) thin films prepared with dc-magnetron sputtering. It was found that the inter-atomic spacing increases as the amount of Ti is increased indicating that Ti is getting dissolved substitutionally in Fe lattice. We found that the addition of 5% Ti is best suited for its usage in Fe-Ti-N alloys.

Tayal, Akhil; Gupta, Mukul; Gupta, Ajay; Stahn, Jochen; Horisberger, M. [UGC-DAE Consortium for Scientific Research, University Campus, Khandwa Road, Indore, 452001 (India); Laboratory for Neutron Scattering, Paul Scherrer Institut, CH-5232 Villigen PSI (Switzerland); Laboratory for Developments and Methods, Paul Scherrer Institut, CH-5232 Villigen PSI (Switzerland)

2012-06-05T23:59:59.000Z

253

Synthesis and Mechanical Properties of AL/ ?-Al12Mg17 ...  

Science Conference Proceedings (OSTI)

Symposium, Advances in Mechanics of One-Dimensional Micro/Nano Materials. Presentation Title, Synthesis and Mechanical Properties of AL/ ?-Al12Mg17 ...

254

AOCS Official Method Ti 1a-64  

Science Conference Proceedings (OSTI)

Spectrophotometric Determination of Conjugated Dienoic Acid AOCS Official Method Ti 1a-64 Methods and Analyses Methods Downloads Methods Downloads Official Method BE2786ABB98768E1DCF0ACFD1AE2520C MC-TI1A64 16847

255

Data Management at the ALS  

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

Data Management at the ALS Print Users of the ALS are responsible for meeting their data management obligations to their home institutions and granting agencies. The ALS does not...

256

X-ray photoelectron spectroscopy characterization of the {omega} phase in water quenched Ti-5553 alloy  

SciTech Connect

X-ray photoelectron spectroscopy was used to investigate the {omega} phase in water quenched Ti-5553 alloy with a nominal composition of Ti-5Al-5V-5Mo-3Cr (wt.%), and the {omega} and the {beta} phase were distinguished by deconvoluting the XPS spectra of Al2p, V2p and Cr2p core level regions. In addition, it is found that the binding energy of core level electron of alloying elements shifts comparing with that of pure metals, and the fact was interpreted by charge redistribution model. X-ray photoelectron spectroscopy technique could be used to characterize the nano-scale {omega} phase in {beta} alloys. - Highlights: Black-Right-Pointing-Pointer We characterize the {omega} phase in Ti-5553 alloy by XPS. Black-Right-Pointing-Pointer Binding energy of Al2p, V2p and Cr2p electron are different in the {omega} and {beta} phase. Black-Right-Pointing-Pointer Structural difference leads to the binding energy gap.

Qin, Dongyang, E-mail: qindongyang19831205@126.com [State Key Laboratory for Mechanical Behavior of Materials, Xian Jiaotong University, Xi'an 710049 (China) [State Key Laboratory for Mechanical Behavior of Materials, Xian Jiaotong University, Xi'an 710049 (China); Northwest Institute for Non-ferrous Metal Research, Xi'an 710016 (China); Lu, Yafeng [Northwest Institute for Non-ferrous Metal Research, Xi'an 710016 (China)] [Northwest Institute for Non-ferrous Metal Research, Xi'an 710016 (China); Zhang, Kong; Liu, Qian [The State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050 (China)] [The State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050 (China); Zhou, Lian [Northwest Institute for Non-ferrous Metal Research, Xi'an 710016 (China)] [Northwest Institute for Non-ferrous Metal Research, Xi'an 710016 (China)

2012-11-15T23:59:59.000Z

257

FAILED-DETONATION SUPERNOVAE: SUBLUMINOUS LOW-VELOCITY Ia SUPERNOVAE AND THEIR KICKED REMNANT WHITE DWARFS WITH IRON-RICH CORES  

SciTech Connect

Type Ia supernovae (SNe Ia) originate from the thermonuclear explosions of carbon-oxygen (C-O) white dwarfs (WDs). The single-degenerate scenario is a well-explored model of SNe Ia where unstable thermonuclear burning initiates in an accreting, Chandrasekhar-mass WD and forms an advancing flame. By several proposed physical processes, the rising, burning material triggers a detonation, which subsequently consumes and unbinds the WD. However, if a detonation is not triggered and the deflagration is too weak to unbind the star, a completely different scenario unfolds. We explore the failure of the gravitationally confined detonation mechanism of SNe Ia, and demonstrate through two-dimensional and three-dimensional simulations the properties of failed-detonation SNe. We show that failed-detonation SNe expel a few 0.1 M{sub Sun} of burned and partially burned material and that a fraction of the material falls back onto the WD, polluting the remnant WD with intermediate-mass and iron-group elements that likely segregate to the core forming a WD whose core is iron rich. The remaining material is asymmetrically ejected at velocities comparable to the escape velocity from the WD, and in response, the WD is kicked to velocities of a few hundred km s{sup -1}. These kicks may unbind the binary and eject a runaway/hypervelocity WD. Although the energy and ejected mass of the failed-detonation SN are a fraction of typical thermonuclear SNe, they are likely to appear as subluminous low-velocity SNe Ia. Such failed detonations might therefore explain or are related to the observed branch of peculiar SNe Ia, such as the family of low-velocity subluminous SNe (SN 2002cx/SN 2008ha-like SNe).

Jordan, George C. IV; Van Rossum, Daniel R. [Center for Astrophysical Thermonuclear Flashes, University of Chicago, Chicago, IL 60637 (United States); Perets, Hagai B. [Physics Department, Technion, Israel Institute of Technology, Haifa 32000 (Israel); Fisher, Robert T. [Department of Physics, University of Massachusetts Dartmouth, 285 Old Westport Road, North Dartmouth, MA 02740 (United States)

2012-12-20T23:59:59.000Z

258

TYPE Ia SUPERNOVA PROPERTIES AS A FUNCTION OF THE DISTANCE TO THE HOST GALAXY IN THE SDSS-II SN SURVEY  

Science Conference Proceedings (OSTI)

We use Type Ia supernovae (SNe Ia) discovered by the Sloan Digital Sky Survey-II SN Survey to search for dependencies between SN Ia properties and the projected distance to the host-galaxy center, using the distance as a proxy for local galaxy properties (local star formation rate, local metallicity, etc.). The sample consists of almost 200 spectroscopically or photometrically confirmed SNe Ia at redshifts below 0.25. The sample is split into two groups depending on the morphology of the host galaxy. We fit light curves using both MLCS2K2 and SALT2, and determine color (A{sub V} , c) and light-curve shape ({Delta}, x{sub 1}) parameters for each SN Ia, as well as its residual in the Hubble diagram. We then correlate these parameters with both the physical and the normalized distances to the center of the host galaxy and look for trends in the mean values and scatters of these parameters with increasing distance. The most significant (at the 4{sigma} level) finding is that the average fitted A{sub V} from MLCS2K2 and c from SALT2 decrease with the projected distance for SNe Ia in spiral galaxies. We also find indications that supernovae (SNe) in elliptical galaxies tend to have narrower light curves if they explode at larger distances, although this may be due to selection effects in our sample. We do not find strong correlations between the residuals of the distance moduli with respect to the Hubble flow and the galactocentric distances, which indicates a limited correlation between SN magnitudes after standardization and local host metallicity.

Galbany, Lluis; Miquel, Ramon; Oestman, Linda [Institut de Fisica d'Altes Energies, Universitat Autonoma de Barcelona, E-08193 Bellaterra (Barcelona) (Spain); Brown, Peter J.; Olmstead, Matthew D. [Department of Physics and Astronomy, University of Utah, Salt Lake City, UT 84112 (United States); Cinabro, David [Department of Physics and Astronomy, Wayne State University, Detroit, MI 48201 (United States); D'Andrea, Chris B.; Nichol, Robert C. [Institute of Cosmology and Gravitation, University of Portsmouth, Dennis Sciama Building, Burnaby Road, Portsmouth PO1 3FX (United Kingdom); Frieman, Joshua [Kavli Institute for Cosmological Physics, University of Chicago, 5640 South Ellise Avenue, Chicago, IL 60637 (United States); Jha, Saurabh W. [Department of Physics and Astronomy, Rutgers the State University of New Jersey, 136 Frelinghuysen Road, Piscataway, NJ 08854 (United States); Marriner, John [Center for Astrophysics, Fermi National Accelerator Laboratory, P.O. Box 500, Batavia, IL 60510 (United States); Nordin, Jakob [E.O. Lawrence Berkeley National Lab, 1 Cyclotron Rd., Berkeley, CA 94720 (United States); Sako, Masao [Department of Physics and Astronomy, University of Pennsylvania, 209 South 33rd Street, Philadelphia, PA 19104 (United States); Schneider, Donald P. [Department of Astronomy and Astrophysics, The Pennsylvania State University, University Park, PA 16802 (United States); Smith, Mathew [Department of Physics, University of Western Cape, Bellville 7535, Cape Town (South Africa); Sollerman, Jesper [Oskar Klein Centre, Department of Astronomy, AlbaNova, SE-106 91 Stockholm (Sweden); Pan, Kaike; Snedden, Stephanie; Bizyaev, Dmitry; Brewington, Howard, E-mail: lluis.galbany@ist.utl.pt [Apache Point Observatory, P.O. Box 59, Sunspot, NM 88349 (United States); and others

2012-08-20T23:59:59.000Z

259

2012 ALS User Meeting Awards  

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

ALS User Meeting Awards Print Recipients of the 2012 Users' Executive Committee awards and Student Poster Competition were announced Tuesday, October 9, at the ALS User Meeting....

260

2012 ALS User Meeting Awards  

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

Awards 2012 ALS User Meeting Awards Print Recipients of the 2012 Users' Executive Committee awards and Student Poster Competition were announced Tuesday, October 9, at the ALS User...

Note: This page contains sample records for the topic "ti ia al" 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

2012 ALS User Meeting Awards  

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

2 ALS User Meeting Awards Recipients of the 2012 Users' Executive Committee awards and Student Poster Competition were announced Tuesday, October 9, at the ALS User Meeting. David...

262

2012 ALS User Meeting Awards  

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

2012 ALS User Meeting Awards Print Recipients of the 2012 Users' Executive Committee awards and Student Poster Competition were announced Tuesday, October 9, at the ALS User...

263

ALS in the News  

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

feed-image feed-image Digg: ALSBerkeleyLab Facebook Page: 208064938929 Flickr: advancedlightsource Twitter: ALSBerkeleyLab YouTube: AdvancedLightSource Home About the ALS ALS in the News ALS in the News Roman Seawater Concrete Holds the Secret to Cutting Carbon Emissions Print Tuesday, 04 June 2013 00:00 An international team led by Paulo Monteiro of the Advanced Light Source and UC Berkeley has analyzed samples of Roman concrete from harbor installations that have survived 2,000 years of chemical attack and wave action, "one of the most durable construction materials on the planet," says UC Berkeley's Marie Jackson, a leading member of the team. Says Monteiro, "It's not that modern concrete isn't good, but manufacturing Portland cement accounts for seven percent of the carbon dioxide that industry puts into the air." The carbon footprint of Roman concrete, made from lime, volcanic ash, and seawater, is much smaller.

264

ALS Beamlines Directory  

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

Beamlines Directory Beamlines Directory ALS Beamlines Directory Print Beamlines, Parameters, Contact Information, and Schedules Download a high-resolution version of the ALS Beamclock. See Beamclock to view the ALS energy-related beamlines beamclock. Beamline Parameters Beamline and endstation technical information is available through the links below. Unless otherwise noted, all beamlines are currently operational. Individual beamline schedules are posted when available. Please contact the responsible beamline scientist for additional schedule information. When calling from off-site, all beamline (BL) phone numbers that begin with a "2" are preceded by 495- (i.e., 495-2014); all others are preceded by 486-. Beamline Number Source Technique/ Group Name Energy Range Beamline Contact Schedule/BL Phone

265

Stress-induced martensitic transformations in NiTi and NiTi-TiC composites investigated by neutron diffraction  

SciTech Connect

Superelastic NiTi (51.0 at% Ni) with 0, 10 and 20 vol% TiC particles were deformed under uniaxial compression as neutron diffraction spectra were simultaneously obtained. The experiments yielded in-situ measurements of the thermoelastic stress-induced transformation. A detailed Rietveld determination is made of the phase fractions and the evolving strains in the reinforcing TiC particles and the austenite as it transforms to martensite on loading (and its subsequent back transformation on unloading). These strains are used to shed light on the phenomenon of load transfer in composites where the matrix undergoes a stress-induced phase transformation.

Vaidyanathan, R. [Massachusetts Inst. of Tech., Cambridge, MA (United States). Dept. of Materials Science and Engineering; Bourke, M.A.M. [Los Alamos National Lab., NM (United States); Dunand, D.C. [Northwestern Univ., Evanston, IL (United States)

1998-12-31T23:59:59.000Z

266

A Measurement of the Rate of type-Ia Supernovae at Redshift $z\\approx$ 0.1 from the First Season of the SDSS-II Supernova Survey  

E-Print Network (OSTI)

We present a measurement of the rate of type Ia supernovae (SNe Ia) from the first of three seasons of data from the SDSS-II Supernova Survey. For this measurement, we include 17 SNe Ia at redshift $z\\le0.12$. Assuming a flat cosmology with $\\Omega_m = 0.3=1-\\Omega_\\Lambda$, we find a volumetric SN Ia rate of $[2.93^{+0.17}_{-0.04}({\\rm systematic})^{+0.90}_{-0.71}({\\rm statistical})] \\times 10^{-5} {\\rm SNe} {\\rm Mpc}^{-3} h_{70}^3 {\\rm year}^{-1}$, at a volume-weighted mean redshift of 0.09. This result is consistent with previous measurements of the SN Ia rate in a similar redshift range. The systematic errors are well controlled, resulting in the most precise measurement of the SN Ia rate in this redshift range. We use a maximum likelihood method to fit SN rate models to the SDSS-II Supernova Survey data in combination with other rate measurements, thereby constraining models for the redshift-evolution of the SN Ia rate. Fitting the combined data to a simple power-law evolution of the volumetric SN Ia rat...

Dilday, Benjamin; Frieman, J A; Holtzman, J; Marriner, J; Miknaitis, G; Nichol, R C; Romani, R; Sako, M; Bassett, B; Becker, A; Cinabro, D; De Jongh, F; Depoy, D L; Doi, M; Garnavich, P M; Hogan, C J; Jha, S; Konishi, K; Lampeitl, H; Marshall, J L; McGinnis, D; Prieto, J L; Riess, A G; Richmond, M W; Schneider, D P; Smith, M; Takanashi, N; Tokita, K; van der Heyden, K; Zheng, N Yasuda C; Barentine, J; Brewington, H; Choi, C; Crotts, A; Dembicky, J; Harvanek, M; Im, M; Ketzeback, W; Kleinman, S J; KrzesiÅ?ski, J; Long, D C; Malanushenko, E; Malanushenko, V; McMillan, R J; Nitta, A; Pan, K; Saurage, G; Snedden, S A; Watters, S; Wheeler, J C; York, D

2008-01-01T23:59:59.000Z

267

FUNDAMENTALS OF GAMMA TITANIUM ALUMINIDES: I: Phase ...  

Science Conference Proceedings (OSTI)

They are disordered solution phases: liquid, (Ti, Al), (Ti, Al), (Al); ordered intermetallic phases: 2Ti3Al, TiAl, TiAl3 and stoichiometric compounds: TiAl2, Ti2Al5.

268

Making the Standard Candle: A study of how the progenitor white dwarf modulates the peak luminosity of type Ia supernovae  

SciTech Connect

The goals of the proposed research as stated in the proposal were to: • Build a suite of one-dimensional initial models of different metallicities and central densities. • Using the improved flame capturing scheme, simulate the explosion of a white dwarf with embedded Lagrangian tracer particles, and post-process the thermal histories of the tracers to reconstruct the nucleosynthesis of the explosion. • Survey the effects of a changing progenitor metallicity on the isotopic yields. Of particular interest is 1) whether the linear relation between the mass of 56Ni synthesized and the pro- genitor metallicity is moderated by the effect of electron captures in the core; and 2) how a varying central density alters the relation between metallicity and 56Ni mass. • Using these results, examine how the observed metallicity distribution would affect the brightness distribution of SNe Ia and the isotopic ratios about the Fe-peak.

Brown, Edward F [Michigan State University

2010-01-21T23:59:59.000Z

269

Determining the motion of the solar system relative to the cosmic microwave background using type Ia supernovae  

E-Print Network (OSTI)

We estimate the solar system motion relative to the cosmic microwave background using type Ia supernovae (SNe) measurements. We take into account the correlations in the error bars of the SNe measurements arising from correlated peculiar velocities. Without accounting for correlations in the peculiar velocities, the SNe data we use appear to detect the peculiar velocity of the solar system at about the 3.5 sigma level. However, when the correlations are correctly accounted for, the SNe data only detects the solar system peculiar velocity at about the 2.5 sigma level. We forecast that the solar system peculiar velocity will be detected at the 9 sigma level by GAIA and the 11 sigma level by the LSST. For these surveys we find the correlations are much less important as most of the signal comes from higher redshifts where the number density of SNe is insufficient for the correlations to be important.

Christopher Gordon; Kate Land; Anze Slosar

2007-11-27T23:59:59.000Z

270

Phase Field Simulation of Ni4Ti3 Precipitation in Porous NiTi Shape ...  

Science Conference Proceedings (OSTI)

Generally, porous NiTi alloys may undergo thermomechnical treatment which .... of First Derivative of Dilatation in Low Carbon Steels Multi-Phase Presenting.

271

Low Cost TiOLow Cost TiO22 NanoparticlesNanoparticles  

uniform TiO2 nanoparticles show great potential in numerous markets, including lighting, signage, automotive and solar energy for their excellent

272

Synthesis of Ti/TiC Composites by Mechanical Milling Followed by ...  

Science Conference Proceedings (OSTI)

carbon nanotubes were subjected to high energy ball milling followed by spark plasma sintering (SPS) to synthesize Ti composite reinforced with in-situ formed ...

273

Hydrothermal Growth of the TiO2 Nanowire Array on Ti Plates for the ...  

Science Conference Proceedings (OSTI)

Applications of the aligned TiO2 nanowire array were studied in both the photoanalytic mineralization of acetone, benzene and dye molecules in water and the ...

274

ALS User Meeting Archives  

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

User Meeting Archives Print User Meeting Archives Print Past User Meeting Agendas, Workshops, and Awards Year Agenda Workshops David A. Shirley (Science) Klaus Halbach (Instrumentation) Tim Renner (Service) 2012 2012 User Meeting Agenda 2012 User Meeting Workshops 2012 ALS User Meeting Awards Carl Percival, Dudley Shallcross, Craig Taatjes and David Osborn (Sandia), for making the first direct measurements of the reactions of Criegee intermediates, and showing that their impact on tropospheric chemistry and climate may be substantially greater than previously assumed. 2012 ALS User Meeting Awards Jeff Dickert and Simon Morton of Berkeley Lab's Physical Biosciences Division for the invention and implementation of the Compact Variable Collimator (CVC), which has led to a dramatic increase in productivity of protein crystallography.

275

ALS Beamlines Directory  

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

Beamlines Directory Print Beamlines Directory Print Beamlines, Parameters, Contact Information, and Schedules Download a high-resolution version of the ALS Beamclock. See Beamclock to view the ALS energy-related beamlines beamclock. Beamline Parameters Beamline and endstation technical information is available through the links below. Unless otherwise noted, all beamlines are currently operational. Individual beamline schedules are posted when available. Please contact the responsible beamline scientist for additional schedule information. When calling from off-site, all beamline (BL) phone numbers that begin with a "2" are preceded by 495- (i.e., 495-2014); all others are preceded by 486-. Beamline Number Source Technique/ Group Name Energy Range Beamline Contact Schedule/BL Phone

276

ALS Beamlines Directory  

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

Beamlines Directory Print Beamlines Directory Print Beamlines, Parameters, Contact Information, and Schedules Download a high-resolution version of the ALS Beamclock. See Beamclock to view the ALS energy-related beamlines beamclock. Beamline Parameters Beamline and endstation technical information is available through the links below. Unless otherwise noted, all beamlines are currently operational. Individual beamline schedules are posted when available. Please contact the responsible beamline scientist for additional schedule information. When calling from off-site, all beamline (BL) phone numbers that begin with a "2" are preceded by 495- (i.e., 495-2014); all others are preceded by 486-. Beamline Number Source Technique/ Group Name Energy Range Beamline Contact Schedule/BL Phone

277

2012 ALS User Meeting Awards  

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

2 ALS User Meeting Awards 2012 ALS User Meeting Awards Print Wednesday, 10 October 2012 15:30 Recipients of the 2012 Users' Executive Committee awards and Student Poster...

278

Spectral Content of 22Na/44Ti Decay Data: Implications for a Solar Influence  

E-Print Network (OSTI)

We report a reanalysis of data on the measured decay rate ratio $^{22}$Na/$^{44}$Ti which were originally published by Norman et al., and interpreted as supporting the conventional hypothesis that nuclear decay rates are constant and not affected by outside influences. We find upon a more detailed analysis of both the amplitude and the phase of the Norman data that they actually favor the presence of an annual variation in $^{22}$Na/$^{44}$Ti, albeit weakly. Moreover, this conclusion holds for a broad range of parameters describing the amplitude and phase of an annual sinusoidal variation in these data. The results from this and related analyses underscore the growing importance of phase considerations in understanding the possible influence of the Sun on nuclear decays. Our conclusions with respect to the phase of the Norman data are consistent with independent analyses of solar neutrino data obtained at Super-Kamiokande-I and the Sudbury Neutrino Observatory (SNO).

Daniel O'Keefe; Brittany L. Morreale; Robert H. Lee; John B. Buncher; Ephraim Fischbach; Tom Gruenwald; Jere H. Jenkins; Daniel Javorsek II; Peter A. Sturrock

2012-12-10T23:59:59.000Z

279

Negative ion photodetachment spectroscopy of the Al3O2 , Al3O3 , Al4Ox , Al5Ox (x = 35), Al6O5 , and Al7O5 clusters  

E-Print Network (OSTI)

Negative ion photodetachment spectroscopy of the Al3O2 , Al3O3 , Al4Ox , Al5Ox (x = 3­5), Al6O5 , and Al7O5 clusters Giovanni Meloni, Michael J. Ferguson and Daniel M. Neumark Department of Chemistry as an Advance Article on the web 9th September 2003 The Al3O2 , Al3O3 , Al4Ox , Al5Ox (x ¼ 3­5), Al6O5 , and Al7

Neumark, Daniel M.

280

2013 ALS User Meeting Highlights  

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

2013 ALS User Meeting Highlights 2013 ALS User Meeting Highlights 2013 ALS User Meeting Highlights Print This year's ALS User Meeting launched with a welcome from Users' Executive Committee Chair Corie Ralston and LBNL Director Paul Alivisatos. ALS Director Roger Falcone followed with a "state of the ALS" presentation that began with a reminder of the ALS mission, which he noted remains true even in the midst of a government shutdown: "Supporting users in doing outstanding science in a safe environment." Falcone gave the 414 meeting attendees an update on the ALS beamlines, which included good news about increased user numbers thanks to the new RAPIDD access system, enhanced robotics, and remote capabilities. Falcone reflected that ALS metrics continue to represent our highly productive users-the number of journal articles and papers per user that come from ALS research have continued to grow in the past year. Looking forward, Falcone touched on how a proposed ALS upgrade to a diffraction-limited light source would increase scientific capabilities.

Note: This page contains sample records for the topic "ti ia al" 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

2013 ALS User Meeting Highlights  

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

2013 ALS User Meeting Highlights 2013 ALS User Meeting Highlights 2013 ALS User Meeting Highlights Print Thursday, 24 October 2013 09:06 This year's ALS User Meeting launched with a welcome from Users' Executive Committee Chair Corie Ralston and LBNL Director Paul Alivisatos. ALS Director Roger Falcone followed with a "state of the ALS" presentation that began with a reminder of the ALS mission, which he noted remains true even in the midst of a government shutdown: "Supporting users in doing outstanding science in a safe environment." Falcone gave the 414 meeting attendees an update on the ALS beamlines, which included good news about increased user numbers thanks to the new RAPIDD access system, enhanced robotics, and remote capabilities. Falcone reflected that ALS metrics continue to represent our highly productive users-the number of journal articles and papers per user that come from ALS research have continued to grow in the past year. Looking forward, Falcone touched on how a proposed ALS upgrade to a diffraction-limited light source would increase scientific capabilities.

282

TiSol | Open Energy Information  

Open Energy Info (EERE)

TiSol TiSol Jump to: navigation, search Name TiSol Place Pasadena, California Sector Solar Product California-based start up focused on the production of dye sensitized solar cells. Coordinates 29.690847°, -95.196308° 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":29.690847,"lon":-95.196308,"alt":0,"address":"","icon":"","group":"","inlineLabel":"","visitedicon":""}]}

283

A localised subgrid scale model for fluid dynamical simulations in astrophysics II: Application to type Ia supernovae  

E-Print Network (OSTI)

The dynamics of the explosive burning process is highly sensitive to the flame speed model in numerical simulations of type Ia supernovae. Based upon the hypothesis that the effective flame speed is determined by the unresolved turbulent velocity fluctuations, we employ a new subgrid scale model which includes a localised treatment of the energy transfer through the turbulence cascade in combination with semi-statistical closures for the dissipation and non-local transport of turbulence energy. In addition, subgrid scale buoyancy effects are included. In the limit of negligible energy transfer and transport, the dynamical model reduces to the Sharp-Wheeler relation. According to our findings, the Sharp-Wheeler relation is insuffcient to account for the complicated turbulent dynamics of flames in thermonuclear supernovae. The application of a co-moving grid technique enables us to achieve very high spatial resolution in the burning region. Turbulence is produced mostly at the flame surface and in the interior ash regions. Consequently, there is a pronounced anisotropy in the vicinity of the flame fronts. The localised subgrid scale model predicts significantly enhanced energy generation and less unburnt carbon and oxygen at low velocities compared to earlier simulations.

W. Schmidt; J. C. Niemeyer; W. Hillebrandt; F. K. Roepke

2006-01-23T23:59:59.000Z

284

Early and late time VLT spectroscopy of SN 2001el - progenitor constraints for a type Ia supernova  

E-Print Network (OSTI)

We present early time high-resolution (VLT/UVES) and late time low-resolution (VLT/FORS) optical spectra of the normal type Ia supernova, SN 2001el. The high-resolution spectra were obtained 9 and 2 days before (B-band) maximum light in order to detect narrow hydrogen and/or helium emission lines from the SN CSM. No such lines were detected in our data. We therefore use photoionisation models to derive upper limits of 1x10^-5 and 6x10^-5 Msol/yr, assuming wind velocities of 10 and 50 km/s, respectively, for the mass loss rate from the progenitor system of SN 2001el. This excludes a symbiotic star in the upper mass loss rate regime from being the progenitor of SN 2001el. The low-resolution spectrum was obtained in the nebular phase of the supernova, \\~400 days after the maximum light, to search for any hydrogen rich gas originating from the SN progenitor system. However, we see no signs of Balmer lines in our spectrum. Therefore, we model the late time spectra to derive an upper limit of ~0.03 Msol for solar a...

Mattila, S; Sollerman, J; Kozma, C; Baron, E; Fransson, C; Leibundgut, B; Nomoto, K

2005-01-01T23:59:59.000Z

285

Das Leben als Krankheit: Kafkas Ein Landarzt  

E-Print Network (OSTI)

Das Leben als Krankheit. Franz Kafkas Ein Landarzt Muhammedsei. Die menschliche Existenz als eine unheilbare Krankheit:Vorstellung vom Menschen als Be- herrscher seines Lebens.

Al-Azzawi, Muhammed

2011-01-01T23:59:59.000Z

286

Joint SSRTNet/ALS-MES Workshop report  

E-Print Network (OSTI)

conclusion of his SRRTNet/ALS-MES Workshop presentation inJoint SSRTNet/ALS-MES Workshop This joint workshop broughtthe Advanced Light Source (ALS) Users’ Association Annual

Shuh, David; Van Hove, Michel

2001-01-01T23:59:59.000Z

287

ALS Beamline Design Requirements - Revision 1  

E-Print Network (OSTI)

materials are not allowed in the ALS experiment area withoutlocations provided by the ALS. c. Cleaning proceduresa successful walkthrough, the ALS Director or designee gives

Heimann, Phil

2010-01-01T23:59:59.000Z

288

Promising Magnesium Battery Research at ALS  

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

AdvancedLightSource Home Science Highlights Industry @ ALS Promising Magnesium Battery Research at ALS Promising Magnesium Battery Research at ALS Print Wednesday, 23...

289

Properties of Ti-5Al-5Mo-5V-3Cr Samples Produced via Powder Hot ...  

Science Conference Proceedings (OSTI)

Feb 1, 2010 ... If the price of this product displays as $0.00 for your customer category, you may download it for free. You must, however, add it to your cart and ...

290

Towards Understanding the Tool Demands for HSM of Ti6Al4V  

Science Conference Proceedings (OSTI)

Challenges in Applying Diamond Coatings to Carbide Twist Drills ... Investigation of a Hybrid Cutting Tool Design for Shearing Operations of Sheet Metals.

291

Microstructure and Properties of Laser Shock Processed Ti6Al4V ...  

Science Conference Proceedings (OSTI)

Phase Change Materials in Thermal Energy Storage for Concentrating Solar Power (CSP) · Phase Diagram Calculation and Its Applications to Materials Design ...

292

Hot Deformation Behavior of Ti-6Al-4V Alloy with a' Martensite ...  

Science Conference Proceedings (OSTI)

... Corrosion Inhibition for Hydrochloric Acid Pickling · Using Resistance Heating to Create Full-Scale API RP2Z CTOD Samples ...

293

Thermal Stability Study on a New Ni-Cr-Co-Mo-Nb-Ti-Al Superalloy  

Science Conference Proceedings (OSTI)

superalloy for advanced ultra-supercritical boiler tubes is under development ... pressure and temperature of their pulverized coal-fired boilers so as to improve ...

294

Development Pathways to Low-Cost Engineering Beta Gamma TiAl ...  

Science Conference Proceedings (OSTI)

About this Abstract. Meeting, 2010 TMS Annual Meeting & Exhibition. Symposium , Cost-Affordable Titanium III. Presentation Title, Development Pathways to ...

295

Characterizing Ultrafine Grained Ti-6Al-4V Thermal Stability with ...  

Science Conference Proceedings (OSTI)

... size as a function of time and temperature, a FEG-SEM equipped with EBSD was enclosed to isolate it from thermal oscillations inherent to HVAC systems.

296

Microstructural Characterization of Ti-6Al-4V Metal Chips by ...  

Science Conference Proceedings (OSTI)

Research supported in part by ORNL's SHaRE User Facility, which is sponsored by the Scientific User Facilities Division, Office of ... Definite: A CD-only volume ...

297

Al 2 TiO 5 Ceramics for New Diesel Particulate Filter and High ...  

Science Conference Proceedings (OSTI)

... thermal durability, high filtration efficiency, low pressure drop-, and adequate ... In particular, DPF ideally combine low thermal expansion, low pressure drop ...

298

A-49: Precipitation Hardening Effect of Ti-Al-Mo-Fe Alloy  

Science Conference Proceedings (OSTI)

... as Shielding Materials for Electromagnetic Interference and Radiation Shielding ... for Nuclear Power Plant Steam Generators during Cold-Working Process.

299

Combustion Formation of Ti2AlC MAX Phase by Electro-Plasma ...  

Science Conference Proceedings (OSTI)

The theoretical density of the powder compact was found to play an important role for the initiation of the combustion reaction. For the compacts with a higher ...

300

Development of Al-TiC Alloys Using Powder Metallurgy as Grain ...  

Science Conference Proceedings (OSTI)

The pressed specimens were sintered from 450 oC in a tube furnace under argon ... Corrosion Protection of Light Metals and Alloys Using Rare Earth Oxide  ...

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


301

Development of Ultrafine-Grained Ti-6Al-4Fe-0.25Si Alloy Without ...  

Science Conference Proceedings (OSTI)

Data Development for Modeling Heat Treatment of 7075 Aluminum Alloy Components ... Processing and Mechanical Behavior of Unalloyed Plutonium.

302

Development of Novel Gamma TiAl Alloys and Their Joining ...  

Science Conference Proceedings (OSTI)

The master alloys having ultimate strength as high as 560 MPa at 900 oC are fabricated by ... Processing and Mechanical Behavior of Unalloyed Plutonium.

303

Lamella Refining Mechanism of TiAl-based Alloys by Different Heat ...  

Science Conference Proceedings (OSTI)

... 1450? by different ways, like furnace cooling, air cooling and oil quenching. ... Study Of The Effect Of Machine Induced Notch And Foreign Object Damage ...

304

Property Investigation of Ti-Al6-V4 Produced by Additive ...  

Science Conference Proceedings (OSTI)

May 1, 2007 ... A correlation to chevron test samples was made in an attempt to reduce necessary sample size. The paper discusses micro-structural features, ...

305

I11 Self-Accommodation Morphology in Ti-Nb-Al Shape Memory Alloy  

Science Conference Proceedings (OSTI)

A37 Unconventional Method of Nitriding of 316l Austenitic Steel · A38 Role of ..... I24 The Study of Cotton Finishing by Artemsia Argyi Oil Microcapsules.

306

Crack-resistance Curve of a Zr-Ti-Cu-Al Bulk Metallic Glass with ...  

Science Conference Proceedings (OSTI)

Symposium, M. Bulk Metallic Glasses, Nanocrystalline Materials, and ... Application of Metallic Glass for High Performance Si Solar Cell: Oxidation Behavior of ...

307

Phase Field Modeling of Beta to Alpha Transformations in Ti-6Al-4V  

Science Conference Proceedings (OSTI)

About this Abstract. Meeting, 2011 TMS Annual Meeting & Exhibition. Symposium , Hume-Rothery Symposium Thermodynamics and Diffusion Coupling in Alloys ...

308

Characteristics and Wear Performance of Nitrided Ti6Al7Nb  

Science Conference Proceedings (OSTI)

Fabrication of a Cellulosic Nanocomposite Scaffold with Improved Supermolecular Structure as a Potential Cardiovascular Tissue-Engineered Graft .

309

Annealed Structure of the Ti-8Al-1V-1Mo Alloy  

Science Conference Proceedings (OSTI)

Author(s), Chang-Hua Yu, Lin-Lung Wei , Chih-Yeh Chao. On-Site Speaker ... Study on Water Absorbing Behavior of Fine Ore for Sintering Process · Synergistic ...

310

Porous Rare-Earth Containing NbTiAl-Based High-entropy Materials ...  

Science Conference Proceedings (OSTI)

The filter properties for the water and air were also measured. ... Novel Self- foaming Cellular Composites Produced from Recycled Water Potabilisation Sludge.

311

Chip Formation Analysis in Laser-assisted Milling of Ti-6Al-4V  

Science Conference Proceedings (OSTI)

About this Abstract. Meeting, Materials Science & Technology 2013. Symposium, Advanced Manufacturing Technologies. Presentation Title, Chip Formation ...

312

Characteristics and Mechanical Properties of Ti6Al4V Lattice ...  

Science Conference Proceedings (OSTI)

EBM opens up new degrees of freedom in design of complex 3D geometries, e.g. the possibility to produce parts with tailored porosity (lattice structures). Lattice ...

313

Rolling and Grinding of Thin Sheets of Beta-Solidified Gamma TiAl ...  

Science Conference Proceedings (OSTI)

Presentation Title, Rolling and Grinding of Thin Sheets of Beta-Solidified ... of process parameters for TNMB1 titanium aluminide for selective laser melting ...

314

The Numerical Analysis of Creep Deformation and Cavitation in TiAl ...  

Science Conference Proceedings (OSTI)

A.C.F. Cocks and M.F. Ahsby, Progress in Mat. Sci., 27 (1982), p. 244. 21. T.-L. Sham and A. Needleman, Acta Met. and Mat., 31 (1983), p. 919. 22. V. Tvergaard  ...

315

A Study of Crystalline-amorphous Phase Transformation of Ti75Al25 ...  

Science Conference Proceedings (OSTI)

Design and Manufacture of Fluidized Bed Reactor in Pilot Scale for Multiple ..... The Effect of Circulating Coal Slurry Water Hardness on Coal Preparation.

316

Preliminary Research on Preparation Al-Si-Ti Alloy With Aluminum ...  

Science Conference Proceedings (OSTI)

Stabilization of Chromium-based Slags with MgO · Study on the EMD Residue and Shale for Preparing Solidification Brick · Study on the In-Situ Remediation of

317

Producing of Composite Layer of TiO2/Al5083 via Friction Stir ...  

Science Conference Proceedings (OSTI)

A Study on the Stress Test of Truck Frames for Freight Trains · A Study on the ... Defect Energetics and Fission Product Transport in ZrC · Deformation Field and ...

318

Electrochemical Preparation of Ti2AlC in Molten Chloride Bath  

Science Conference Proceedings (OSTI)

Cathodic Behavior of Silicon (?) in BaF2-CaF2 –SiO2 Melts ... Electrochemical Impedance Spectroscopy of Uranium Chloride in Molten LiCl-KCl Eutectic.

319

Thermomechanical Treatment of TiAl6V4 Alloy Fabricated by ...  

Science Conference Proceedings (OSTI)

Symposium, Advanced Materials, Processes and Applications for Additive Manufacturing ... Lubricants in Deposition and Machining of Wire and Arc Additive ...

320

Development of Methods for Production of Small Ti6Al4V Parts ...  

Science Conference Proceedings (OSTI)

Symposium, Advanced Materials, Processes and Applications for Additive Manufacturing ... Lubricants in Deposition and Machining of Wire and Arc Additive ...

Note: This page contains sample records for the topic "ti ia al" 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

EBM Process Temperature Study for Ti-6Al-4V Using Infrared ...  

Science Conference Proceedings (OSTI)

Symposium, Advanced Materials, Processes and Applications for Additive Manufacturing ... Lubricants in Deposition and Machining of Wire and Arc Additive ...

322

F8: Formation of Inclusion in Low C-Mn Steel by Ti-Al Complex ...  

Science Conference Proceedings (OSTI)

B17: Characteristics of Liquid Silicon Infiltrated C/C-SiC Composite Using Carbon Nano ... B29: Transport Studies of Electrodes/Electrolytes for Intermediate .... D18: Pure and Doped Ceria Nanoparticles for Green Natural Gas Combustion ... Failure Suspension Knee Bearing Used in Special Belgian Heavy Duty Trailers.

323

E29: Analysis of Fractured Ti-6Al-7Nb Collars  

Science Conference Proceedings (OSTI)

A18: Effect of Local Alendronate Delivery on In Vivo Osteogenesis From PCL ... A7: On-the-fly System Design for High Precision/Ultra Fast/Wide Area Fabrication .... C19: Dissolution Behavior of Cu Under Bump Metallization in Ball Grid Array ... High Volume and Fast Turnaround Automated Inline TEM Sample Preparation.

324

B18: Characteristics of Si-Based Alloys (Ti, Co, Al and Mo) Infiltrated ...  

Science Conference Proceedings (OSTI)

A18: Effect of Local Alendronate Delivery on In Vivo Osteogenesis From PCL ... A7: On-the-fly System Design for High Precision/Ultra Fast/Wide Area Fabrication .... C19: Dissolution Behavior of Cu Under Bump Metallization in Ball Grid Array ... High Volume and Fast Turnaround Automated Inline TEM Sample Preparation.

325

ENVIRONMENT AL REVI  

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

ENVIRONMENT ENVIRONMENT AL REVI EW for CATEG ORI CAL EXCLUS ION DETE RMINATION Rocky Mo unta in Region, Weste rn A rea Power Administra tion Stru cture Replace ment Fla min g Go rge-Vern a l No.3 138-kV tra nsmiss ion lin e (Struct ure No. 25/6) Spr ing 201 2 A. Ilricf J)cscription of Proposal: Western Area Power Adm inistration (Western) proposes to replace Structure No. 25/6 on the Flaming Gorge-Vernal No.3 138-kV transmission line. The structure is located on Bureau of Land Management lands in Uintah County. Utah (Township 3S, Range 22E, Section 7; Donkey Flat 7.5' USGS quadrangle). Work consists of removal and in-kind replacement of the wood H-frame structure and anchors utilizing rubber tired vehicles. crane, bucket truck, pole trucks/trailers, auger rig. and pick-up trucks. All work will be conducted on Western's existing

326

ALS Scientific Advisory Committee Charter  

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

This document was revised and approved December 18, 2008. I. FUNCTION AND REPORTING The ALS Scientific Advisory Committee (SAC) is advisory to the Berkeley Lab Director through...

327

2012 ALS User Meeting Highlights  

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

and notable science highlights, which communicated ALS advances in structural biology, battery research, and fundamental science. Falcone acknowledged the work of Simon Morton and...

328

Restframe I-band Hubble diagram for type Ia supernovae up to redshift z ~; 0.5  

E-Print Network (OSTI)

A. 1999, ApJ, 525, 583 Balbi, A. , Ade, P. , Bock, J. etJa?e, A.H. , Ade, P.A. , Balbi, A. et al. , 2001, Phys. Rev.

2005-01-01T23:59:59.000Z

329

EVOLUTION OF POST-IMPACT COMPANION STARS IN SN Ia REMNANTS WITHIN THE SINGLE-DEGENERATE SCENARIO  

Science Conference Proceedings (OSTI)

The nature of the progenitor systems of Type Ia supernovae is still uncertain. One way to distinguish between the single-degenerate scenario and double-degenerate scenario is to search for the post-impact remnant star. To examine the characteristics of the post-impact remnant star, we have carried out three-dimensional hydrodynamic simulations of supernova impacts on main-sequence-like stars. We explore the evolution of the post-impact remnants using the stellar evolution code MESA. We find that the luminosity and radius of the remnant star dramatically increase just after the impact. After the explosion, post-impact companions continue to expand on a progenitor-dependent timescale of {approx}10{sup 2.5}-10{sup 3} years before contracting. It is found that the time evolution of the remnant star is dependent not only on the amount of energy absorbed but also on the depth of the energy deposition. We examine the viability of the candidate star Tycho G as the possible remnant companion in Tycho's supernova by comparing it to the evolved post-impact remnant stars in our simulations. The closest model in our simulations has a similar effective temperature, but the luminosity and radius are twice as large. By examining the angular momentum distribution in our simulations, we find that the surface rotational speed could drop to {approx}10 km s{sup -1} if the specific angular momentum is conserved during the post-impact evolution, implying that Tycho G cannot be completely ruled out because of its low surface rotation speed.

Pan, Kuo-Chuan; Ricker, Paul M. [Department of Astronomy, University of Illinois at Urbana-Champaign, 1002 West Green Street, Urbana, IL 61801 (United States); Taam, Ronald E., E-mail: kpan2@illinois.edu, E-mail: pmricker@illinois.edu, E-mail: taam@northwestern.edu [Department of Physics and Astronomy, Northwestern University, 2145 Sheridan Road, Evanston, IL 60208 (United States)

2012-11-20T23:59:59.000Z

330

Measurement of the 44Ti(alpha,p)47V reaction cross section, of relevance to gamma-ray observation of core collapse supernovae, using reclaimed 44Ti.  

E-Print Network (OSTI)

Measurement of the 44Ti(alpha,p)47V reaction cross section, of relevance to gamma-ray observation of core collapse supernovae, using reclaimed 44Ti.

Murphy, AStJ; Ayranov, M; Bastin, B; Bemmerer, D; Bingham, R; Bunka, M; Butler, P; Catherall, R; Cocolios, TE; Davinson, T; Delahaye, P; Dorsival, A; Dressler, R; van Duppen, P; Fallis, J; Fox, S; Fulton, BR; Kowalska, M; Laird, A; Lotay, G; Saint Laurent, MG; Marin, A; Mendonca1, JT; de Oliveira, F; Roger, T; Ruiz, C; Sahin, L; Schumann, D; de Sereville1, N; Sorlin, O; Stora, T; Traykov, E; Voulot, D; Wang, C HT; Wenander, FJC; Woods, PJ

2012-01-01T23:59:59.000Z

331

Soham Al Snih Al Snih, MD., PhD. Curriculum Vitae CURRICULUM VITAE  

E-Print Network (OSTI)

Soham Al Snih Al Snih, MD., PhD. Curriculum Vitae 1 CURRICULUM VITAE NAME: Soham Al Snih Al Snih, M at the Sealy Center on Aging, University of Texas Medical Branch, Galveston, TX. #12;Soham Al Snih Al Snih, MD arthritis. B. Grant Support Current Grant Support: 1R03 AG029959-01A2 (Al Snih ­PI) Period: 06

Wood, James B.

332

Gorchakova-IA  

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

(3D) Radiation Codes (Cahalan 2000). In the present work, the broadband fluxes of solar radiation are calculated using two different approaches. The purpose is * to compare...

333

AL PRO | Open Energy Information  

Open Energy Info (EERE)

AL PRO AL PRO Jump to: navigation, search Name AL-PRO Place Grossheide, Lower Saxony, Germany Zip 26532 Sector Wind energy Product AL-PRO is an inndependent expert office for wind forecasts, wind potential studies, turbulence inquiries, visualizations as well as sound and shade throw forecasts Coordinates 53.592743°, 7.34313° 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":53.592743,"lon":7.34313,"alt":0,"address":"","icon":"","group":"","inlineLabel":"","visitedicon":""}]}

334

A Measurement of the Rate of type-Ia Supernovae at Redshift $z\\approx$ 0.1 from the First Season of the SDSS-II Supernova Survey  

E-Print Network (OSTI)

We present a measurement of the rate of type Ia supernovae (SNe Ia) from the first of three seasons of data from the SDSS-II Supernova Survey. For this measurement, we include 17 SNe Ia at redshift $z\\le0.12$. Assuming a flat cosmology with $\\Omega_m = 0.3=1-\\Omega_\\Lambda$, we find a volumetric SN Ia rate of $[2.93^{+0.17}_{-0.04}({\\rm systematic})^{+0.90}_{-0.71}({\\rm statistical})] \\times 10^{-5} {\\rm SNe} {\\rm Mpc}^{-3} h_{70}^3 {\\rm year}^{-1}$, at a volume-weighted mean redshift of 0.09. This result is consistent with previous measurements of the SN Ia rate in a similar redshift range. The systematic errors are well controlled, resulting in the most precise measurement of the SN Ia rate in this redshift range. We use a maximum likelihood method to fit SN rate models to the SDSS-II Supernova Survey data in combination with other rate measurements, thereby constraining models for the redshift-evolution of the SN Ia rate. Fitting the combined data to a simple power-law evolution of the volumetric SN Ia rate, $r_V \\propto (1+z)^{\\beta}$, we obtain a value of $\\beta = 1.5 \\pm 0.6$, i.e. the SN Ia rate is determined to be an increasing function of redshift at the $\\sim 2.5 \\sigma$ level. Fitting the results to a model in which the volumetric SN rate, $r_V=A\\rho(t)+B\\dot \\rho(t)$, where $\\rho(t)$ is the stellar mass density and $\\dot \\rho(t)$ is the star formation rate, we find $A = (2.8 \\pm 1.2) \\times 10^{-14} \\mathrm{SNe} \\mathrm{M}_{\\sun}^{-1} \\mathrm{year}^{-1}$, $B = (9.3^{+3.4}_{-3.1})\\times 10^{-4} \\mathrm{SNe} \\mathrm{M}_{\\sun}^{-1}$.

Benjamin Dilday; R. Kessler; J. A. Frieman; J. Holtzman; J. Marriner; G. Miknaitis; R. C. Nichol; R. Romani; M. Sako; B. Bassett; A. Becker; D. Cinabro; F. DeJongh; D. L. Depoy; M. Doi; P. M. Garnavich; C. J. Hogan; S. Jha; K. Konishi; H. Lampeitl; J. L. Marshall; D. McGinnis; J. L. Prieto; A. G. Riess; M. W. Richmond; D. P. Schneider; M. Smith; N. Takanashi; K. Tokita; K. van der Heyden; N. Yasuda; C. Zheng; J. Barentine; H. Brewington; C. Choi; A. Crotts; J. Dembicky; M. Harvanek; M. Im; W. Ketzeback; S. J. Kleinman; J. Krzesi?ski; D. C. Long; E. Malanushenko; V. Malanushenko; R. J. McMillan; A. Nitta; K. Pan; G. Saurage; S. A. Snedden; S. Watters; J. C. Wheeler; D. York

2008-01-22T23:59:59.000Z

335

A Review Corrosion of TI Grade 7 and Other TI Alloys in Nuclear Waste Repository Environments  

DOE Green Energy (OSTI)

Titanium alloy degradation modes are reviewed in relation to their performance in repository environments. General corrosion, localized corrosion, stress corrosion cracking, hydrogen induced cracking, microbially influenced corrosion, and radiation-assisted corrosion of Ti alloys are considered. With respect to the Ti Grade 7 drip shields selected for emplacement in the repository at Yucca Mountain, general corrosion, hydrogen induced cracking, and radiation-assisted corrosion will not lead to failure within the 10,000 year regulatory period; stress corrosion cracking (in the absence of disruptive events) is of no consequence to barrier performance; and localized corrosion and microbially influenced corrosion are not expected to occur. To facilitate the discussion, Ti Grades 2, 5, 7, 9, 11, 12, 16, 17, 18, and 24 are included in this review.

F. Hua; K. Mon; P. Pasupathi; G. Gordon

2004-05-11T23:59:59.000Z

336

Structural Competition and Phase Transformations in Binary Ti-Nb ...  

Science Conference Proceedings (OSTI)

Structural Competition and Phase Transformations in Binary Ti-Nb Alloys for Biomedical Applications · Structure and Fracture Resistance of Armored Fish Scales.

337

Novel and NiTi-based Shape Memory Alloys  

Science Conference Proceedings (OSTI)

Mar 4, 2013 ... Phase Constitution, Mechanical and Shape Memory Properties of (Pt,Co)Ti Alloys: Hideki Hosoda1; Satoshi Tsutsumi1; Masaki Tahara1; ...

338

Processing and Mechanical Properties of Ti foams - Programmaster ...  

Science Conference Proceedings (OSTI)

Presentation Title, Processing and Mechanical Properties of Ti foams. Author(s), Faming Zhang, Eileen Otterstein, Eberhard Burkel. On-Site Speaker (Planned) ...

339

Electrical Conductance of Single TiO2 Nanotube Devices  

Science Conference Proceedings (OSTI)

As fabricated TiO2 nanotubes with different wall thicknesses were annealed either in ... carbon foam saturated with SiO2 aerogel for heat insulation purposes.

340

Atomic Layer Deposition of TiO2  

Science Conference Proceedings (OSTI)

Scanning electron microscopy (SEM) was performed on TiO2-coated nanoporous alumina membranes using an S4700 microscope (Hitachi, Tokyo, Japan) with ...

Note: This page contains sample records for the topic "ti ia al" 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

Low Cost TiO2 Nanoparticles - Energy Innovation Portal  

Solar Photovoltaic Advanced Materials Low Cost TiO2 Nanoparticles Sandia National Laboratories. Contact SNL About This Technology Publications: Market ...

342

Lessons Learned in Sputtering TiNi Thin Film  

Science Conference Proceedings (OSTI)

Experimental results have been published in journals and conference proceedings, but as yet TiNi thin film is not commercially available. The author and ...

343

L Al N l D t N dLos Alamos Nuclear Data Needs and Activities From Experiment  

E-Print Network (OSTI)

Security, LLC for NNSA U N C L A S S I F I E D Slide 2 #12;The Nuclear Data Enterprise at Los Alamos) · responsible for maintaining the safety, security, and reliability of the i ' l k ilnation's nuclear weaponsL Al N l D t N dLos Alamos Nuclear Data Needs and Activities ­ From Experiment Th h A li ti

Danon, Yaron

344

On the Security of Liaw et al.'s Scheme  

E-Print Network (OSTI)

Recently, Liaw et al. proposed a remote user authentication scheme using smartcards. They claimed a number of features of their scheme, e.g. a dictionary of verification tables is not required to authenticate users; users can choose their password freely; mutual authentication is provided between the user and the remote system; the communication cost and the computational cost are very low; users can update their password after the registration phase; a session key agreed by the user and the remote system is generated in every session; and the nonce-based scheme which does not require a timestamp (to solve the serious time synchronization problem) etc. In this paper We show that Liaw et al.'s scheme does not stand with various security requirements and is completely insecure. Keywords: Authentication, Smartcards, Remote system, Attack.

Awasthi, Amit K

2008-01-01T23:59:59.000Z

345

Impact of superbends at the ALS  

E-Print Network (OSTI)

the prototype [2] . At the ALS injection is made off axis inField Bend Magnet for the ALS", in the Proceedings of theto zero. [5)At present the ALS operates with the dispersion

Nishmura, H.

2011-01-01T23:59:59.000Z

346

Compton Scattering in the ALS Booster  

E-Print Network (OSTI)

Compton Scattering in the ALS Booster D. Robin, C. Kim, and410 COMPTON SCATTERING IN THE ALS BOOSTER* D. Robin, C. Kim,COMPTON SCATTERING IN THE ALS BOOSTER* D. Robin, C. Kim, and

Robin, David

2008-01-01T23:59:59.000Z

347

Spin Spectrometer at the ALS and APS  

E-Print Network (OSTI)

5 Spin Spectrometer at the ALS and APS-NIM/SRI07 Figure 3 Ancollected on Beamline 7 at the ALS is shown here. The photonSpin Spectrometer at the ALS and APS-NIM/SRI07 Spin

Tobin, James G; Lawrence Livermore National Laboratory; University of Missouri-Rolla; Boyd Technologies

2008-01-01T23:59:59.000Z

348

DYNAMIC APERTURE OF THE ALS BOOSTER SYNCHROTRON  

E-Print Network (OSTI)

Nelson, "Magnetic Properties of the ALS noosler Synchrotron23,1989 Dynamic Aperture of the ALS Booster Synchrotron C.H.DYNAMIC APERTURE OF TIlE ALS BOOSTER SYNCIIROlRON· CharI""

Kim, C.H.

2010-01-01T23:59:59.000Z

349

17th Annual ALS Users' Association Meeting  

E-Print Network (OSTI)

Scientific Achievement at the ALS went to Andrea Cavalleri (with an art student's impression of the ALS (center) ;and ALS Acting Director Janos Kirz gave an overview of the

Robinson, Art; Tamura, Lori

2004-01-01T23:59:59.000Z

350

Nonlinear longitudinal dynamics studies at the ALS  

E-Print Network (OSTI)

dynamics studies at the ALS J. M. Byrd † , W-H Cheng, S.MV 4.5 mm Table 1: Nominal ALS longitudinal parameters. "in the Advanced Light Source (ALS), an electron storage ring

Byrd, J.M.; Cheng, W.-H.; De Santis, S.; Li, D.; Stupakov, G.; Zimmermann, F.

1999-01-01T23:59:59.000Z

351

Impedance Measurements of Components for the ALS  

E-Print Network (OSTI)

Impedance Measurements on the ALS Curved Sector Tank", R.A.of the Higher Order Modes of the ALS 500 MHz Acceleratingof Components for the ALS J.N. Corlett and R.A. Rimmer May

Corlett, J.N.

2011-01-01T23:59:59.000Z

352

Recent research highlights from the ALS OML  

E-Print Network (OSTI)

research highlights from the ALS OML V. V. Yashchuk, E. D.the Advanced Light Source (ALS) is to ensure state-of-the-instruments laid out in the ALS strategic plan as well as

Yashchuk, Valeriy V.

2013-01-01T23:59:59.000Z

353

ALS@20 Kick-Off Celebration  

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

ALS@20 ALS@20 Kick-Off Celebration ALS@20 Kick-Off Celebration Print On Friday, January 11, the Advanced Light Source celebrated the beginning of its 20th anniversary year with a...

354

Synthesis of CdSe -- TiO2 Nanocomposites and Their Applications to TiO2 Sensitized Solar Cells  

Science Conference Proceedings (OSTI)

CdSe-TiO{sub 2} nanocomposites were synthesized via aminolysis of Ti-oleate complexes in the presence of CdSe nanocrystals, and their application as sensitizers for TiO{sub 2} solar cells was investigated. The formation of CdSe-TiO{sub 2} nanocomposites was confirmed using transmission electron microscopy and Raman spectroscopy. The emission spectrum of CdSe-TiO{sub 2} nanocomposites revealed photoinduced charge separation at the CdSe-TiO{sub 2} interface of the composite. The photocurrent-voltage properties of CdSe-TiO{sub 2}-sensitized TiO{sub 2} particle films compared favorably with those of CdSe-sensitized TiO{sub 2} films. Evidence was also found indicating that the TiO{sub 2} component of the composite protects CdSe against degradation during film annealing.

Kim, J. Y.; Choi, S. B.; Noh, J. H.; HunYoon, S.; Lee, S.; Noh, T. H.; Frank, A. J.; Hong, K. S.

2009-01-01T23:59:59.000Z

355

Microsoft Word - AL2005-01.doc  

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

Letters (AL) that remain in effect are identified below. All other previously issued ALs have been superseded by a formal rule-making, incorporated into other guidance, andor...

356

Crystallographic Consulting Brings Research to the ALS  

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

Crystallographic Consulting Brings Research to the ALS Crystallographic Consulting Brings Research to the ALS Print Wednesday, 06 February 2013 15:50 cc Tom Pauly and Josh...

357

ALS Doctoral Fellowship in Residence  

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

Doctoral Fellowship in Residence Print Doctoral Fellowship in Residence Print The Advanced Light Source (ALS), a division of Lawrence Berkeley National Laboratory, is a national user facility that generates intense x-ray radiation for scientific and technological research. As the world's first third-generation synchrotron radiation source, the ALS offers outstanding performance in the VUV-soft x-ray energy range and excellent performance into the hard x-ray region. The facility welcomes researchers from universities, industries, and government laboratories around the world. It is funded by the U.S. Department of Energy, Office of Basic Energy Sciences. Applications to Shape the Future of Synchrotron Radiation Science Synchrotron radiation is now an established tool in many areas of physical and biological science. The ALS Doctoral Fellowships will allow beginning researchers to work at the frontier of synchrotron radiation research and to help advance state-of-the-art applications.

358

DOE/EA-1196; Environmental Assessment for Selection and Operation...  

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

e e xi st i ng Nat ur al an d Acc el er a te d Bio re me d ia ti o n Re se a rc h ( NABI R) Pr og r am. Th e NABIR Pro g ra m i s a te n -y ea r f un da me n ta l r es ea rc h p...

359

ST/EL and ST/CV services for TI2 & TI8 LHC injection tunnels  

E-Print Network (OSTI)

This paper describes the ST/EL and ST/CV services for TI2 & TI8 LHC injection tunnels. The cooling and ventilation part describes the requirements for design and installation of more than 10 km of pipeline that is going to be laid down in the tunnels. Main operating parameters as well as manufacture procedures are explained. Preliminary work schedule with the cost estimate is also presented. Electrical power will be distributed from the LHC side and the SPS side for the machine and the general services. All power converters will be installed on surface buildings. The link between the main bend converters and the main bend magnets will be realised with water-cooled cables. Rest of the magnets will be cabled by using conventional copper and aluminium cables. Due to long lengths of the injection tunnels a dry 18kV transformer will be installed in TJ8 to serve the general services for TI8. The same will apply to TI2 by installing a transformer at the bottom of the PMI2 shaft.

Akhtar, S; CERN. Geneva. ST Division

2002-01-01T23:59:59.000Z

360

AL2007-08.doc  

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

Environmentally Preferable Purchasing Through the Use of the Environmentally Preferable Purchasing Through the Use of the Electronic Product Environmental Assessment Tool (EPEAT) References: Presidential Executive Order 13423 Strengthening Federal Environmental, Energy, and Transportation Management Federal Acquisition Regulations (FAR) Subpart 23.7 Contracting for Environmentally Preferable Products and Services DOE Order 450.1, Chg 2, Environmental Protection Program DOE Acquisition Guide, Chapter 23, Greening the Government - Environmental Considerations in Acquisition Electronic Product Environmental Assessment Tool, IEEE Standard 1680-2006 for Environmental Assessment of Personal Computer Products. When is this Acquisition Letter (AL) Effective? This AL is effective immediately upon issuance.

Note: This page contains sample records for the topic "ti ia al" 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

Category:Montgomery, AL | Open Energy Information  

Open Energy Info (EERE)

Montgomery, AL Montgomery, AL Jump to: navigation, search Go Back to PV Economics By Location Media in category "Montgomery, AL" The following 16 files are in this category, out of 16 total. SVFullServiceRestaurant Montgomery AL Alabama Power Co.png SVFullServiceRestauran... 88 KB SVHospital Montgomery AL Alabama Power Co.png SVHospital Montgomery ... 90 KB SVLargeHotel Montgomery AL Alabama Power Co.png SVLargeHotel Montgomer... 86 KB SVLargeOffice Montgomery AL Alabama Power Co.png SVLargeOffice Montgome... 87 KB SVMediumOffice Montgomery AL Alabama Power Co.png SVMediumOffice Montgom... 89 KB SVMidriseApartment Montgomery AL Alabama Power Co.png SVMidriseApartment Mon... 91 KB SVOutPatient Montgomery AL Alabama Power Co.png SVOutPatient Montgomer... 87 KB SVPrimarySchool Montgomery AL Alabama Power Co.png

362

The influence of FeTi and NiTi intermetallide additions on high-temperature oxidation of permalloy alloy  

Science Conference Proceedings (OSTI)

As a rule powder metallurgy Permalloy alloys are used in production of parts for electronic instruments. For the purpose of controlling the magnetic and electrical properties and also the wear (in the case of production of magnetic heads) and corrosion resistance appropriate additions of metals or such compounds as carbides and oxides are added to the alloy. In this work use of FeTi and NiTi intermetallides produced by reaction sintering of powders of pure metals in a protective atmosphere as alloying additions to Permalloy is recommended. The size of the original powders is less than 100 {mu}m. For reaction sintering at temperature 50{degrees}C above the eutectic temperature in the Ti-TiFe and TiNi-Ni systems was selected. The contents of titanium, iron, and oxygen in the FeTi alloy is 51.9, 45.7, and 2.4 wt.%, respectively, and of titanium, nickel, and oxygen in the NiTi alloy 59.6, 31.9, and 4.6 wt.%. High-temperature oxidation in air up to 1300{degrees}C with a rate of change in temperature of 15{degrees}C of type 78N Permalloy with additions of FeTi and NiTi alloys was investigated with use of methods of differential thermal and differential thermogravimetric analyses on an OD-103 derivatograph under nonisothermal conditions. The reaction products were studied by x-ray diffraction phase analysis on a DRON-3 instrument in CoK{sub {alpha}}-radiation. Pure 78N alloy powder with a composition of 78.1% Ni + 19.3% Fe (specimen 1) and also with additions of 1% FeTi (specimen 2) and 1% NiTi (specimen 3) were subjected to oxidation.

Klimenko, V.N.; Lavrenko, V.A.; Panasyuk, O.A.; Blasova, O.V.; Protsenko, T.G. [Inst. of Materials Science, Kiev (Ukraine)

1995-11-01T23:59:59.000Z

363

Anderson Todd ALS Annis Edna EETD  

E-Print Network (OSTI)

EH&S Anderson Todd ALS Annis Edna EETD OCFO EETD EETD Beavers Christine ALS Bennett Stacy HR Borden Chakraborty Romy ESD Condon Martha AFRD Crippen Katie Non LBNL Crofoot Derrick ALS Donovan Thomas EH&S Flynn Michelle Facilities Fox Brian OCFO Geller Jil ESD George Anthe PBD Gerasimova Anna PBD Giangrasso Gary ALS

364

Al Magnifico Rettore Prof Luigi Frati  

E-Print Network (OSTI)

Al Magnifico Rettore Prof Luigi Frati Al Direttore Generale Dott. Montaguti Ubaldo OGGETTO: Accordo che nell'Assemblea RS.U. del 23 novembre 2009 è stato richiesto all'unanimità di dare mandato al persona del Dott. Ubaldo Montaguti e le OO.SS. ed RS.U in merito al salario accessorio del personale

Di Pillo, Gianni

365

Microsoft Word - AL2007-01.doc  

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

AL-2007-01 (12/15/06) AL-2007-01 (12/15/06) 1 Department of Energy No. AL-2007-01 Acquisition Regulation Date 12/15/06 ACQUISITION LETTER This Acquisition Letter is issued by the Procurement Executive of DOE. Subject: Implementation of Functional Accountability Requirements References: Secretary of Energy Memorandum dated May 23, 2006, Functional Accountability When is this Acquisition Letter (AL) Effective? This AL, which includes the attached OPAM Implementation Plan and DOE Corporate Implementation Plan, are effective immediately. When does this AL Expire? This AL remains in effect until superseded or canceled and is subject to change as needed. Who is the Point of Contact?

366

RELATIVISTIC SHOCK BREAKOUTS-A VARIETY OF GAMMA-RAY FLARES: FROM LOW-LUMINOSITY GAMMA-RAY BURSTS TO TYPE Ia SUPERNOVAE  

SciTech Connect

The light from a shock breakout of stellar explosions, which carries a wealth of information, strongly depends on the shock velocity at the time of the breakout. The emission from Newtonian breakouts, typical in regular core-collapse supernovae (SNe), has been explored extensively. However, a large variety of explosions result in mildly or ultrarelativistic breakouts, where the observed signature is unknown. Here we calculate the luminosity and spectrum produced by relativistic breakouts. In order to do so, we improve the analytic description of relativistic radiation-mediated shocks and follow the system from the breakout itself, through the planar phase and into the spherical phase. We limit our calculation to cases where the post-breakout acceleration of the gas ends during the planar phase (i.e., the final gas Lorentz factor {approx}< 30). We find that spherical relativistic breakouts produce a flash of gamma rays with energy, E{sub bo}, temperature, T{sub bo}, and duration, t{sup obs} b{sub o}, that provide the breakout radius ( Almost-Equal-To 5 R{sub Sun }(t{sup obs}{sub bo}/10 s)(T{sub bo}/50 keV){sup 2}) and the Lorentz factor ( Almost-Equal-To T{sub bo}/50 keV). They also always satisfy a relativistic breakout relation (t{sup obs}{sub bo}/20 s) {approx} (E{sub bo}/10{sup 46} erg){sup 1/2}(T{sub bo}/50 keV){sup -2.68}. The breakout flare is typically followed, on longer timescales, by X-rays that carry a comparable energy. We apply our model to a variety of explosions, including Type Ia and .Ia SNe, accretion-induced collapse, energetic SNe, and gamma-ray bursts (GRBs). We find that all these events produce detectable gamma-ray signals, some of which may have already been seen. Some particular examples are: (1) relativistic shock breakouts provide a natural explanation to the energy, temperature, and timescales of low-luminosity GRBs. Indeed, all observed low-luminosity GRBs satisfy the relativistic breakout relation. (2) Nearby broad-line Type Ib/c (like SN 2002ap) may produce a detectable {gamma}-ray signal. (3) Galactic Type Ia SNe may produce detectable {gamma}-ray flares. We conclude that relativistic shock breakouts provide a generic process for the production of gamma-ray flares.

Nakar, Ehud [Raymond and Beverly Sackler School of Physics and Astronomy, Tel Aviv University, Tel Aviv 69978 (Israel); Sari, Re'em [Racah Institute for Physics, Hebrew University, Jerusalem 91904 (Israel)

2012-03-10T23:59:59.000Z

367

AL2007-05.doc  

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

7-05 7-05 Acquisition Regulation Date 03/29/2007 ACQUISITION LETTER This Acquisition Letter is issued under the authority of the DOE and NNSA Procurement Executives. Acquisition Letters (AL) that remain in effect are identified below. All other previously issued ALs have been superseded by a formal rule-making, incorporated into other guidance, and/or canceled. * * * * * * * * * * * * * * * * ACQUISITION LETTERS REMAINING IN EFFECT NUMBER DATE SUBJECT 93-4 04/07/93 Displaced Workers Benefits Program 94-19 12/09/94 Basic Labor Policies Fringe Benefits 95-06 06/28/95 Personal Property Letter System 95-14 11/17/95 Subcontracts under the New Independent States - Industrial Partnering Program

368

AL2007-03.doc  

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

AL 2007-03 AL 2007-03 Acquisition Regulation Date 03/30/07 ACQUISITION LETTER This Acquisition Letter is issued under the authority of the DOE and NNSA Procurement Executives. Subject: Interagency Acquisition References: FAR Part 7 Acquisition Planning FAR Part 8 Required Sources of Supplies and Services FAR Part 10 Market Research FAR Subpart 17.2 Options FAR Subpart 17.5 Interagency Acquisitions under the Economy Act FAR Part 37 Service Contracting FAR Part 38 Federal Supply Schedule Contracting FAR Part 42 Contract Management DEAR 970.1707 Work For Others Guide Chapter 7.1 Acquisition Planning Guide Chapter 17.1 Interagency Agreements Guide Chapter 38.1 Task Order Contracting Strategic Acquisition Transaction Guide

369

Solar Wind: Manifestations of Solar Activity E N CYC LO PE D IA O F AS T R O N O MY AN D AS T R O PHYS I C S Solar Wind: Manifestations of Solar  

E-Print Network (OSTI)

Solar Wind: Manifestations of Solar Activity E N CYC LO PE D IA O F AS T R O N O MY AN D AS T R O PHYS I C S Solar Wind: Manifestations of Solar Activity The Sun's outer atmosphere, the corona, is continually heated and expands to create the solar wind. Solar activity waxes and wanes with the 11 yr cycle

Webb, David F.

370

Passivation of In{sub 0.53}Ga{sub 0.47}As/ZrO{sub 2} interfaces by AlN atomic layer deposition process  

SciTech Connect

Reducing defects at III-V/high-k interfaces is essential for optimizing devices built on these materials. Here, the role of an interfacial AlN process at In{sub 0.53}Ga{sub 0.47}As/ZrO{sub 2} interfaces is investigated by hard x-ray photoelectron spectroscopy (HAXPES) and capacitance/voltage (C-V) measurements. C-V measurements show a significant reduction in the density of interface traps with the interfacial AlN process and a capping TiN layer. To elucidate the specific role of the AlN process, blanket films with various deposition processes are compared. The AlN process alone (without subsequent dielectric deposition) reduces InGaAs oxide levels below the HAXPES detection limit, even though the AlN is ultimately found to be oxidized into AlO{sub x} with only trace N incorporation, yet AlN passivation provides a lower D{sub it} (density of interface traps) when compared with an H{sub 2}O-based Al{sub 2}O{sub 3} deposition. The AlN process does not passivate against re-oxidation of the InGaAs during an O{sub 3} based ZrO{sub 2} deposition process, but it does provide passivation against As-As development during subsequent TiN deposition. The role of chemical defects in the C-V characteristics is also discussed.

Weiland, C.; Woick, J. C. [National Institute of Standards and Technology, Gaithersburg, Maryland 20899 (United States); Rumaiz, A. K. [National Synchrotron Light Source, Brookhaven National Laboratory, Upton, New York 11973 (United States); Price, J.; Lysaght, P. [SEMATECH, 257 Fuller Road, Albany, New York 12203 (United States)

2013-07-21T23:59:59.000Z

371

Controlling Atomic Layer Deposition of TiO2 in Aerogels through Surface Functionalization  

DOE Green Energy (OSTI)

This report demonstrates a chemical functionalization method for controlling atomic layer deposition (ALD) of TiO{sub 2} in low-density nanoporous materials. Functionalization of silica aerogel with trimethylsilane is shown to strongly suppress TiO{sub 2} growth via ALD. Subsequent modification of the functionalization through selective removal of the hydrocarbon groups reactivates the aerogel towards TiO{sub 2} deposition. These results demonstrate the potential use of ALD as a selective tool for creating novel nanoporous materials. Nanoporous materials present significant technological advantage for a wide range of applications, including catalysis, energy storage and conversion, nanoelectronics to name just a few (1-4). Hence, there is considerable interest in developing synthetic pathways for the fabrication of nanoporous materials with tailored properties. Aerogels (AGs) are unique low-density, open-cell porous materials consisting of submicrometer pores and ligaments that can be used as a robust material platform for designing novel nanoporous materials. In recent years, a synthetic approach based on ALD on AG templates has emerged as a promising method for the directed growth of nanoporous materials (5-11, 18). This approach has been used successfully to prepare millimeter-sized high aspect ratio aerogels coated uniformly with zinc oxide (ZnO), tungsten (W) and alumina (Al{sub 2}O{sub 3}) (10, 11). The ALD process utilizes two sequential, self-limiting surface reactions resulting in a layer-by-layer growth mode. The self limiting nature of the surface reactions makes ALD a particularly suitable technique for uniform deposition onto high aspect ratio porous substrates. Additionally, chemical specificity of the surface reactions in ALD enables one to control the deposition process through selective functionalization of the substrate surface. In fact the functionalization of planar substrates such as silicon wafers with organosilane groups (R{sub n}SiX{sub 4-n} (n = 1-3)) has been shown to deactivate the substrate towards ZrO{sub 2}, HfO{sub 2}, ZnO, and TiO{sub 2} ALD processes (12-16). A possible mechanism for the deactivation effect is the blocking of surface functional groups, such as hydroxyl (OH) moieties, which serve as chemisorption sites for the ALD precursors and hence are essential for nucleating the deposition process. Henceforth, we shall refer to these surface functional groups as nucleation sites for the ALD process.

Ghosal, S; Baumann, T F; King, J S; Kucheyev, S; Wang, Y; Worsley, M A; Biener, J; Bent, S F; Hamza, A V

2009-03-09T23:59:59.000Z

372

The ALS Gun Electronics system  

SciTech Connect

The ALS Gun Electronics system has been designed to accommodate gun with a custom made socket and high speed electronics circuit which is capable of producing single and multiple electron bunches with time jitters measured at better than 50 PS. The system generates the gated RF signal at ground level before sending it up to the 120 KV-biased gun deck via a fiber optic cable. The current pulse width as a function of grid bias, using an Eimac 8847A planar triode simulating an electron gun, was measured to show the relationship between the two parameters.

Lo, C.C.

1993-05-01T23:59:59.000Z

373

Microsoft Word - AL2002-03.doc  

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

AL 2002-03 (3/13/2002) AL 2002-03 (3/13/2002) Subject: Public Relations Requirements References: Deputy Secretary Letter dated February 25, 2002 When is this Acquisition Letter (AL) Effective? This AL is effective 10 business days from the date of issuance. When does this AL Expire? This AL remains in effect until superseded or canceled. Who is the Point of Contact? Contact Bob Webb of the Office of Procurement and Assistance Policy at (202) 586-8264, or via e-mail at robert.webb@hq.doe.gov Visit our website at www.pr.doe.gov for information on Acquisition Letters and other policy issues. What is the Purpose of this AL? The purpose of this AL is to provide guidance regarding the processing of procurement requests for obtaining contractual services from public relations

374

Al Husseini Amelio JV | Open Energy Information  

Open Energy Info (EERE)

Al Husseini Amelio JV Jump to: navigation, search Name Al-Husseini & Amelio JV Place Jordan Sector Solar Product JV company to develop a 1GW solar plant in Jordan and an integrated...

375

Al Corn Clean Fuel | Open Energy Information  

Open Energy Info (EERE)

to: navigation, search Name Al-Corn Clean Fuel Place Claremont, North Dakota Product Al-Corn is an ethanol plant located in Claremont, North Dakota, which is owned by local...

376

ALS Operating Schedule on Google Calendar  

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

ALS Operating Schedule on Google Calendar Print ALS Operating Schedule Your browser does not appear to support JavaScript, but this page needs to use JavaScript to display...

377

Nature of Transactions (TI) Code | National Nuclear Security Administration  

National Nuclear Security Administration (NNSA)

Nature of Transactions (TI) Code | National Nuclear Security Administration Nature of Transactions (TI) Code | National Nuclear Security Administration Our Mission Managing the Stockpile Preventing Proliferation Powering the Nuclear Navy Emergency Response Recapitalizing Our Infrastructure Continuing Management Reform Countering Nuclear Terrorism About Us Our Programs Our History Who We Are Our Leadership Our Locations Budget Our Operations Media Room Congressional Testimony Fact Sheets Newsletters Press Releases Speeches Events Social Media Video Gallery Photo Gallery NNSA Archive Federal Employment Apply for Our Jobs Our Jobs Working at NNSA Blog Nature of Transactions (TI) Code Home > About Us > Our Programs > Nuclear Security > Nuclear Materials Management & Safeguards System > NMMSS Information, Reports & Forms > Code Tables > Nature of Transactions (TI) Code

378

Explosive joints in Nb--Ti/Cu composite superconductors  

SciTech Connect

Explosive welding techniques have been applied to the joining of a Nb-Ti/ Cu composite conductor. Details of the process are given together with mechanical and electrical evaluations of the resulting joints. (auth)

Cornish, D.N.; Zbasnik, J.P.; Pattee, H.E.

1975-11-01T23:59:59.000Z

379

J-26: Nanocomposite Photocatalysts Containing TiO2 for ...  

Science Conference Proceedings (OSTI)

... viruses, fungi and algae. The main drawbacks of the low quantum yields and the lack of visible-light utilization hinder the practical applications of TiO2. Hence  ...

380

TiO2: Fundamentals, Applications, and Perspectives  

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

TiO2: Fundamentals, Applications, and Perspectives Speaker(s): Werner Hofer Date: November 18, 2011 (All day) Location: 90-3122 Seminar HostPoint of Contact: Robert Kostecki I...

Note: This page contains sample records for the topic "ti ia al" 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

080- Carbon Modified (CM)-n-TiO  

Science Conference Proceedings (OSTI)

An undoped reference n-TiO2 sample was also synthesized in an electric oven for .... 131- Metastable ?-FeNi Particles for Self-Limited RF Heating.

382

Effects of Ti Content on Cavitation Resistance of Austenitic Stainless ...  

Science Conference Proceedings (OSTI)

D8: Study of Rack and Chord Assembly Formability for Jack-up Platforms ... Zone of Zr-Ti Microalloyed High-strength High-toughness Offshore Structural Steels.

383

Properties of dc magnetron reactively sputtered TiN  

Science Conference Proceedings (OSTI)

Titanium nitride is of interest for IC fabrication because of its excellent performance as a metallic diffusion barrier. TiN films have been deposited in a batch sputtering system equipped with dc magnetron cathodes

Jim Stimmell

1986-01-01T23:59:59.000Z

384

Synthesis of Nanostructured TiO2 /Carbon Nanotube Heterojunction ...  

Science Conference Proceedings (OSTI)

Microstructural Evolution of SnS Thin Films Grown by Electrodeposition · Morphology Engineering of 1D, 2D and 3D TiO2 Nanostructures and Their Application ...

385

3DXRD Characterization of GNDs and Deformation Twins in ?-Ti  

Science Conference Proceedings (OSTI)

... ?-Ti using the 3DXRD station 34-ID-E at the Advanced Photon Source, Argonne National Laboratory. ... Research at APS 34-ID-E, partly funded by BES/ DOE.

386

ELE TRO HEMI AL SOLUTION GROWTH  

market Utility grid modernization (incorporation of renewable energy using energy storage) TE HNOLOGI AL High potential for producing

387

FLUORES ENT OPTI AL POSITION SENSOR  

POTENTIAL APPLI ATIONS TE HNOLOGI AL Hazardous environments Oil & gas drilling Mineral drilling Water well drilling ENEFITS Measures fluorescent light ...

388

Effect of Al-Si-Al and Al-Si-Si-Al Pairs in the ZSM-5 Zeolite Framework on the 27 NMR Spectra. A Combined High-Resolution 27  

E-Print Network (OSTI)

Effect of Al-Si-Al and Al-Si-Si-Al Pairs in the ZSM-5 Zeolite Framework on the 27 Al NMR Spectra. A Combined High-Resolution 27 Al NMR and DFT/MM Study Jiri´ Dedecek, Stepan Sklenak,*, Chengbin Li, Blanka of the presence of Al-O-Si-O-Al and Al-O-Si-O-Si-O-Al sequences in the ZSM-5 zeolite framework on the local

Sklenak, Stepan

389

4 November 2003 Kaufmann et al. 2005  

E-Print Network (OSTI)

4 November 2003 Kaufmann et al. 2005 #12;Two questions raised by submm- observations presented by Kaufmann et al. 2004: By what mechanism(s) is the emission produced? · Thermal free-free radiation? · Anomalous widths of the 511 keV emission? · High energy electrons? #12;Kaufmann et al. 2004 4 November 2003

White, Stephen

390

Superhydrophilic TiO2 surface without photocatalytic activation  

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

Superhydrophilic TiO2 surface without photocatalytic activation Superhydrophilic TiO2 surface without photocatalytic activation Title Superhydrophilic TiO2 surface without photocatalytic activation Publication Type Journal Article Year of Publication 2010 Authors Zormpa, Vasileia, Xiaobo Chen, and Samuel S. Mao Journal Applied Physics Letter Volume 96 Issue 9 Date Published 12/2009 Abstract Since the discovery of extreme surface wetting phenomenon induced by ultraviolet photocatalysis, TiO2 has become the material of choice for environmental friendly applications such as self-cleaning coatings. Nevertheless, it remains a significant challenge to realize surfaces exhibiting persistent superhydrophilicity but without the need of external stimuli. We report a bioinspired TiO2 nanostructure that shows extreme superhydrophilicity without the need of light activation, and with stability against successive wetting-dewetting cycles. This ultimate TiO2 wetting surface exhibits high transmittance from near ultraviolet to the infrared, thus enabling practical antifogging technologies where transparency is critical.

391

Microsoft Word - AL2006-01.doc  

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

6-01 6-01 Acquisition Regulation Date 10/27/05 ACQUISITION LETTER This Acquisition Letter is issued under the authority of the DOE and NNSA Procurement Executives. Subject: Electronic Subcontracting Reporting System (eSRS) References: FAR Subpart 19.7 The Small Business Subcontracting Program DEAR 919.705-6 Postaward responsibilities of the contracting officer AL 2005-07 Small Business Procurement Goals What is the Effective date of this Acquisition Letter (AL)? This AL is effective immediately after the eSRS goes online. When does this AL Expire? This AL remains in effect until superseded or canceled. What are the Points of Contact?

392

Native SrTiO3 (001) surface layer from resonant Ti L2,3 reflectance spectroscopy  

SciTech Connect

We quantitatively model resonant Ti L2,3 reflectivity Rs,p(q, hn) from several SrTiO3 (001) single crystals having different initial surface preparations and stored in ambient conditions before and between measurements. All samples exhibit unexpected 300 K Rs(hn) - Rp(hn) anisotropy corresponding to weak linear dichroism and tetragonal distortion of the TiO6 octahedra indicating a surface layer with properties different from cubic SrTiO3. Oscillations in Rs(q) confirm a ubiquitous surface layer 2-3 nm thick that evolves over a range of time scales. Resonant optical constant spectra derived from Rs,p(hn) assuming a uniform sample are refined using a single surface layer to fit measured Rs(q). Differences in surface layer and bulk optical properties indicate that the surface is significantly depleted in Sr and enriched in Ti and O. While consistent with the tendency of SrTiO3 surfaces toward non-stoichiometry, this layer does not conform simply to existing models for the near surface region and apparently forms via room temperature surface reactions with the ambient. This new quantitative spectral modeling approach is generally applicable and has potential to study near-surface properties of a variety of systems with unique chemical and electronic sensitivities.

Valvidares, Manuel; Huijben, Mark; Yu, Pu; Ramesh, Ramamoorthy; Kortright, Jeffrey

2010-11-03T23:59:59.000Z

393

Das Standard Modell als Theorie  

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

as a Theory as a Theory Ungelöste Rätsel Das Standard Modell als Theorie Auch wenn das Standard Modell die im Experiment beobachteten Phänomene sehr gut beschreibt, so ist es dennoch eine unvollständige Theorie. Das Problem liegt darin, dass das Standard Modell nicht erklären kann, warum einige Teilchen gerade diejenigen Eigenschaften haben, die wir beobachten. Zum Beispiel, auch wenn den Physikern die Massen aller Quarks - mit Ausnahme derjenigen des top Quarks - seit Jahren bekannt waren, so war es dennoch nicht möglich die Masse des top Quarks ohne die Hilfe experimenteller Daten genau vorherzusagen. Das ist deshalb so, weil das Standard Modell keine Erklärung dafür geben kann, warum die Liste der Teilchenmassen gerade diese Zahlenwerte aufweist.

394

Mechanochemical synthesis and rapid consolidation of nanocrystalline 3NiAl-Al2O3 composites  

Science Conference Proceedings (OSTI)

Nanopowders of 3NiAl and Al2O3 were synthesized from 3NiO and 5Al powders by high-energy ball milling. Nanocrystalline Al2O3 reinforced composite was consolidated by high-frequency induction-heated sintering ...

In-Jin Shon; In-Yong Ko; Seung-Hoon Jo; Jung-Mann Doh; Jin-Kook Yoon; Sang-Whan Park

2011-01-01T23:59:59.000Z

395

Microstructure and dielectric properties of piezoelectric magnetron sputtered w-ScxAl1-xN thin films  

Science Conference Proceedings (OSTI)

Piezoelectric wurtzite ScxAl1 xN (x = 0, 0.1, 0.2, 0.3) thin films were epitaxially grown by reactive magnetron co-sputtering from elemental Sc and Al targets. Al2O3(0001) wafers with TiN(111) seed and electrode layers were used as substrates. X-ray diffraction shows that an increase in the Sc content results in the degradation of the crystalline quality. Samples grown at 400 C possess true dielectric behavior with quite low dielectric losses and the leakage current is negligible. For ScAlN samples grown at 800 C, the crystal structure is poor and leakage current is high. Transmission electron microscopy with energy dispersive x-ray spectroscopy mapping shows a mass separation into ScN-rich and AlN-rich domains for x 0.2 when substrate temperature is increased from 400 to 800 C. The piezoelectric response of epitaxial ScxAl1 xN films measured by piezoresponse force microscopy and double beam interferometry shows up to 180% increase by the addition of Sc up to x = 0.2 independent of substrate temperature, in good agreement with previous theoretical predictions based on density-functional theory.

Zukauskaite, Agne [Linkoping University; Wingqvist, Gunilla [Linkoping University; Palisaitis, Justinas [Linkoping University; Jensen, Jens [Linkoping University; Persson, Per [Linkoping University; Matloub, Ramin [Ecole Polytechnique Federale de Lausanne, Switzerland; Muralt, Paul [Ecole Polytechnique Federale de Lausanne, Switzerland; Kim, Yunseok [ORNL; Birch, Jens [Linkoping University; Hultman, Lars [Linkoping University

2012-01-01T23:59:59.000Z

396

Self-Organized Amorphous TiO2 Nanotube Arrays on Porous Ti Foam for Rechargeable Lithium and Sodium Ion Batteries  

SciTech Connect

Self-organized amorphous TiO2 nanotube arrays (NTAs) were successfully fabricated on both Ti foil and porous Ti foam through electrochemical anodization techniques. The starting Ti foams were fabricated using ARCAM s Electron Beam Melting (EBM) technology. The TiO2 NTAs on Ti foam were used as anodes in lithium ion batteries; they exhibited high capacities of 103 Ahcm-2 at 10 Acm-2 and 83 Ahcm-2 at 500 Acm-2, which are two to three times higher than those achieved on the standard Ti foil, which is around 40 Ahcm-2 at 10 Acm-2 and 24 Ahcm-2 at 500 Acm-2, respectively. This improvement is mainly attributed to higher surface area of the Ti foam and higher porosity of the nanotube arrays layer grown on the Ti foam. In addition, a Na-ion half-cell composed of these NTAs anodes and Na metal showed a self-improving specific capacity upon cycling at 10 Acm-2. These results indicate that TiO2 NTAs grown on Ti porous foam are promising electrodes for Li-ion or Na-ion rechargeable batteries.

Bi, Zhonghe [ORNL; Paranthaman, Mariappan Parans [ORNL; Menchhofer, Paul A [ORNL; Dehoff, Ryan R [ORNL; Bridges, Craig A [ORNL; Chi, Miaofang [ORNL; Guo, Bingkun [ORNL; Sun, Xiao-Guang [ORNL; Dai, Sheng [ORNL

2013-01-01T23:59:59.000Z

397

MAGNETIC PROPERTIES OF THE ALS BOOSTER SYNCHROTRON ENGINEERING MODEL MAGNETS  

E-Print Network (OSTI)

Dynamic Aperture of the ALS Booster Synchrotron." presented25953 MAGNETIC PROPERTIES OF TIIE ALS BOOSTER SYNCIIROlRONMagnetic Measurements of the ALS Booster Dipole Engineering

Keller, R.

2010-01-01T23:59:59.000Z

398

Multi-Megawatt Organic Rankine Engine power plant (MORE). Phase IA final report: system design of MORE power plant for industrial energy conservation emphasizing the cement industry  

SciTech Connect

The Multi-Megawatt Organic Rankine Engine (MORE) program is directed towards the development of a large, organic Rankine power plant for energy conservation from moderate temperature industrial heat streams. Organic Rankine power plants are ideally suited for use with heat sources in the temperature range below 1100/sup 0/F. Cement manufacture was selected as the prototype industry for the MORE system because of the range of parameters which can be tested in a cement application. This includes process exit temperatures of 650/sup 0/F to 1110/sup 0/F for suspension preheater and long dry kilns, severe dust loading, multi-megawatt power generation potential, and boiler exhaust gas acid dew point variations. The work performed during the Phase IA System Design contract period is described. The System Design task defines the complete MORE system and its installation to the level necessary to obtain detailed performance maps, equipment specifications, planning of supporting experiments, and credible construction and hardware cost estimates. The MORE power plant design is based upon installation in the Black Mountain Quarry Cement Plant near Victorville, California.

Bair, E.K.; Breindel, B.; Collamore, F.N.; Hodgson, J.N.; Olson, G.K.

1980-01-31T23:59:59.000Z

399

THE POST-MERGER MAGNETIZED EVOLUTION OF WHITE DWARF BINARIES: THE DOUBLE-DEGENERATE CHANNEL OF SUB-CHANDRASEKHAR TYPE Ia SUPERNOVAE AND THE FORMATION OF MAGNETIZED WHITE DWARFS  

SciTech Connect

Type Ia supernovae (SNe Ia) play a crucial role as standardizable cosmological candles, though the nature of their progenitors is a subject of active investigation. Recent observational and theoretical work has pointed to merging white dwarf binaries, referred to as the double-degenerate channel, as the possible progenitor systems for some SNe Ia. Additionally, recent theoretical work suggests that mergers which fail to detonate may produce magnetized, rapidly rotating white dwarfs. In this paper, we present the first multidimensional simulations of the post-merger evolution of white dwarf binaries to include the effect of the magnetic field. In these systems, the two white dwarfs complete a final merger on a dynamical timescale, and are tidally disrupted, producing a rapidly rotating white dwarf merger surrounded by a hot corona and a thick, differentially rotating disk. The disk is strongly susceptible to the magnetorotational instability (MRI), and we demonstrate that this leads to the rapid growth of an initially dynamically weak magnetic field in the disk, the spin-down of the white dwarf merger, and to the subsequent central ignition of the white dwarf merger. Additionally, these magnetized models exhibit new features not present in prior hydrodynamic studies of white dwarf mergers, including the development of MRI turbulence in the hot disk, magnetized outflows carrying a significant fraction of the disk mass, and the magnetization of the white dwarf merger to field strengths {approx}2 Multiplication-Sign 10{sup 8} G. We discuss the impact of our findings on the origins, circumstellar media, and observed properties of SNe Ia and magnetized white dwarfs.

Ji Suoqing; Fisher, Robert T. [University of Massachusetts Dartmouth, Department of Physics, 285 Old Westport Road, North Dartmouth, MA 02740 (United States); Garcia-Berro, Enrique [Departament de Fisica Aplicada, Universitat Politecnica de Catalunya, c/Esteve Terrades, 5, E-08860 Castelldefels (Spain); Tzeferacos, Petros; Jordan, George; Lee, Dongwook [Center for Astrophysical Thermonuclear Flashes, The University of Chicago, Chicago, IL 60637 (United States); Loren-Aguilar, Pablo [School of Physics, University of Exeter, Stocker Road, Exeter EX4 4QL (United Kingdom); Cremer, Pascal [Bethe Center for Theoretical Physics, Universitaet Bonn, Nussallee 12, D-53115 Bonn (Germany); Behrends, Jan [Fachbereich Physik, Freie Universitaet Berlin, Arnimallee 14, D-14195 Berlin (Germany)

2013-08-20T23:59:59.000Z

400

Microsoft Word - Final MR AL.doc  

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

No. AL 2009-01 No. AL 2009-01 Acquisition Regulation Date: 10/06/2008 ACQUISITION LETTER This Acquisition Letter is issued under the authority of the DOE and NNSA Procurement Executives. Subject: Management Reserve and Contingency References: FAR Subpart 15.4 Contract Pricing FAR Part 31 Contract Cost Principles and Procedures FAR 31.205-7 Contingencies DEAR 915.404-4-70-2 Weighted Guidelines System DOE Order 413.3A Program and Project Management for the Acquisition of Capital Assets DOE Acquisition Guide Weighted Guidelines Chapter 15.4-2 When is this Acquisition Letter (AL) effective? This AL is effective upon issuance. When does this AL Expire? This AL remains in effect until superseded or canceled.

Note: This page contains sample records for the topic "ti ia al" 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

Microsoft Word - AL2008-05.doc  

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

Department of Energy No. AL 2008-05 Department of Energy No. AL 2008-05 Acquisition Regulation Date 04/03/2008 ACQUISITION LETTER This Acquisition Letter is issued under the authority of the DOE and NNSA Procurement Executives. Subject: Environmental, Energy, and Transportation Management References: Executive Order 13423, dated January 24, 2007 Implementing Instructions, dated March 28, 2007 When is this Acquisition Letter (AL) effective? This AL is effective upon issuance. When does this AL Expire? This AL remains in effect until superseded or canceled by amendments of the Federal Acquisition Regulation (FAR) or the Department of Energy Acquisition Regulation (DEAR). Whom do you Contact for More Information? For Department of Energy (DOE) contracts, contact Richard Langston, Office of Procurement

402

ALS Ceramics Materials Research Advances Engine Performance  

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

ALS Ceramics Materials Research ALS Ceramics Materials Research Advances Engine Performance ALS Ceramics Materials Research Advances Engine Performance Print Thursday, 27 September 2012 00:00 LBNL senior materials scientist and UC Berkeley professor Rob Ritchie has been researching the fracture behavior of a wide array of materials for the past 40 years, the last ten of them using the facilities at the ALS. From human bone to synthetic engineering materials such as shape-memory metals and composites, Ritchie has illuminated groundbreaking cracking patterns and the underlying mechanistic processes using the x-ray synchrotron micro-tomography at ALS Beamline 8.3.2. Summary Slide ritchie ceramics This 3D image of a ceramic composite specimen imaged under load at 1750C shows the detailed fracture patterns that researchers are able to view using ALS Beamline 8.3.2. The vertical white lines are the individual silicon carbide fibers in this sample about 500 microns in diameter.

403

Microsoft Word - AL2006-10.doc  

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

AL-2006-10 AL-2006-10 Acquisition Regulation Date 08/11/06 ACQUISITION LETTER This Acquisition Letter is issued under the authority of the DOE and NNSA Procurement Executives. Subject: CLASS DEVIATION FOR CERTAIN DEAR INTELLECTUAL PROPERTY CLAUSES References: DEAR 970.2704 Rights in Data DEAR 970.2770 Technology Transfer DEAR 970.5227-2 Rights in Data-Technology Transfer DEAR 970.5227-3 Technology Transfer Mission When is this Acquisition Letter (AL) Effective? This AL is effective upon issuance. When does this AL Expire? This AL remains in effect until superseded or canceled. Who is the Point of Contact? Contact Robert M. Webb of the Office of Procurement and Assistance Policy at (202)287-1338 or Robert.Webb@hq.doe.gov.

404

ALS Beamline Design Requirements - Revision 1  

E-Print Network (OSTI)

the beamline including: • Electrical power requirements e.at the ALS include: • Electrical power: 480VAC, 208VAC, 120terminations, and electrical power requirements. Beamline

Heimann, Phil

2010-01-01T23:59:59.000Z

405

Microsoft Word - AL2005-03.doc  

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

AL 2005-03 AL 2005-03 Acquisition Regulation Date 10/08/04 ACQUISITION LETTER This Acquisition Letter is issued under the authority of the DOE and NNSA Procurement Executives. Subject: Independent Peer Review Program for Contractors' Purchasing Systems References: FAR 44.3, Contractors' Purchasing Systems Reviews DEAR Subpart 970.44 - Management and Operating Contractor Purchasing DOE Acquisition Guide, Chapter 1.2, Balanced Scorecard Performance Assessment Program (DOE only) DOE Acquisition Guide, Chapter 70.7, Contract Administration, Reference Book for Contract Administrators, Chapter 10 (DOE only) When is this Acquisition Letter (AL) effective? This AL is effective 10 business days from the date of issuance.

406

Microsoft Word - AL2006-07.doc  

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

Department of Energy No. AL-2006-07 Acquisition Regulation Date 08/23/06 ACQUISITION LETTER This Acquisition Letter is issued by the Procurement Executives of DOE and NNSA. Subject: DOE Order 361.1A, Acquisition Career Development Program References: DOE O 361.1A, Acquisition Career Development (ACD) Program Office of Federal Procurement Policy (OFPP) Policy Letter 05-01, Developing and Managing the Acquisition Workforce OFPP Policy Letter 06-01 OFPP Memoranda, The Federal Acquisition Certification in Contracting Program, dated January 20, 2006, When is this Acquisition Letter (AL) Effective? This AL is effective immediately When does this AL Expire?

407

Ni 2 Al(?´) - Programmaster.org  

Science Conference Proceedings (OSTI)

The selective etching of ? phase was conducted by electrochemical ... Storage of CO2 in Low Al2O3 EAF Oxidizing Slag by Grinding with Vibration Mill.

408

containing Co-Al-W-base Superalloys  

Science Conference Proceedings (OSTI)

About this Abstract. Meeting, 2014 TMS Annual Meeting & Exhibition. Symposium , High-temperature Gamma (f.c.c.) /Gamma-Prime (L12 structure) Co-Al-W ...

409

BaTiO? based materials for piezoelectric and electro-optic applications  

E-Print Network (OSTI)

Ferroelectric materials are key to many modem technologies, in particular piezoelectric actuators and electro-optic modulators. BaTiO? is one of the most extensively studied ferroelectric materials. The use of BaTiO? for ...

Avrahami, Ytshak, 1969-

2003-01-01T23:59:59.000Z

410

Ti3+ in the surface of titanium dioxide: generation, properties and photocatalytic application  

Science Conference Proceedings (OSTI)

Titanium dioxide (TiO2) is the most investigated crystalline oxide in the surface science of metal oxides. Its physical and chemical properties are dominantly determined by its surface condition. Ti3+ surface defect (TSD) is one ...

Liang-Bin Xiong; Jia-Lin Li; Bo Yang; Ying Yu

2012-01-01T23:59:59.000Z

411

Molecular beam epitaxy of SrTiO3 with a growth window  

E-Print Network (OSTI)

Estimated MBE growth window for SrTiO 3 in conventional MBEregion shows the growth window for stoichiometric films with4 (color online): Growth window for stoichiometric SrTiO 3

Stemmer, Susanne

2009-01-01T23:59:59.000Z

412

176 High-Temperature Oxidation of Ti-48Al-2Cr-2Nb-(0~1%)W ...  

Science Conference Proceedings (OSTI)

... of LiMnxFe1-xPO4 Glass and Glass-Ceramics for Lithium Ion Battery .... and Comparing the Inhibition Effect of Chromate, Bromate and Molybdate on the ...

413

LASER Powder Deposition of AlMgB14-TiB2 Ultra-Hard Coatings on ...  

Science Conference Proceedings (OSTI)

About this Abstract. Meeting, 2012 TMS Annual Meeting & Exhibition. Symposium , Randall M. German Honorary Symposium on Sintering and Powder-Based ...

414

Microstructure, Texture and Mechanical Property Evolution during Additive Manufacturing of Ti6Al4V Alloy for Aerospace Applications.  

E-Print Network (OSTI)

??Additive Manufacturing (AM) is an innovative manufacturing process which offers near-net shape fabrication of complex components, directly from CAD models, without dies or substantial machining,… (more)

Antonysamy, Alphons Anandaraj

2012-01-01T23:59:59.000Z

415

Microsoft Word - al2005-06.doc | Department of Energy  

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

Microsoft Word - al2005-06.doc Microsoft Word - al2005-06.doc More Documents & Publications Microsoft Word - AL2006-01.doc OPAM Policy Acquisition Guides Microsoft Word - AL2005-08...

416

New Strategic Plan Takes the ALS into the Future  

E-Print Network (OSTI)

on line at www-als.lbl.gov/als/ourorg/strategicplan.pdf.Strategic Plan Takes the ALS into the Future J. Kirz *† ,is in place to upgrade the ALS so it can continue to address

2006-01-01T23:59:59.000Z

417

A nuclear magnetic resonance probe of Fe-Al and Al20V2Eu intermetallics  

E-Print Network (OSTI)

Al-rich Fe-Al systems (FeAl2, Fe2 Al5 and Fe4Al13) and Al20V2Eu have complicated structures with quasicrystal-like features making these materials potentially of interest for magnetic behavior. However, there is not much work on these materials. To study the variety of magnetic properties, we use NMR, magnetic susceptibility, specific heat and other methods in this work. The microscopic electronic and magnetic properties of the Al-rich Fe-Al system and Al20V2Eu have been studied via 27Al NMR at temperatures between 4 and 500 K. The results of spin lattice relaxation rates reveal a pseudogap in Fe4Al13 and Fe2Al5 around the Fermi-level in the density of states. Besides, a square well gap with a width of 2 meV and center at Fermi energy was detected by specific heat measurements in Fe2Al5. Both Fe4 Al13 and Fe2Al5 are non-magnetic systems with dilute magnetic defects, while FeAl2 is a concentrated local magnetic moment system. In Al20V2Eu, a crossover was observed in NMR, magnetization and transport measurements. Above 40 K, Eu(2+) local magnetic moments dominate; below 40 K, a transition to a Kondo regime is observed, where the Kondo effect leads to the reduction of localized moments due to the formation of a spin-compensated Kondo cloud. With increasing magnetic field, f electrons participate more and more in excitations near the Fermi level and a heavy-Fermion state was observed through specific heat measurements at high magnetic field.

Chi, Ji

2007-08-01T23:59:59.000Z

418

Topology of charge density and elastic properties of Ti3SiC2 polymorphs  

E-Print Network (OSTI)

1. Structure models of Ti 3 SiC 2 . ? and ? refer to the twothe Brillouin zone of Ti 3 SiC 2 . c 400 MPa a 400 MPa c 400and elastic properties of Ti 3 SiC 2 polymorphs R. Yu, X. F.

Yu, Rong; Zhang, Xiao Feng; He, Lian Long; Ye, Heng Qiang

2004-01-01T23:59:59.000Z

419

High strength, light weight Ti-Y composites and method of making same  

DOE Patents (OSTI)

A high strength, light weight in-situ'' Ti-Y composite is produced by deformation processing a cast body having Ti and Y phase components distributed therein. The composite comprises elongated, ribbon-shaped Ti and Y phase components aligned along an axis of the deformed body.

Verhoeven, J.D.; Ellis, T.W.; Russell, A.M.; Jones, L.L.

1993-04-06T23:59:59.000Z

420

Fabrication and thermoelectric properties of fine-grained TiNiSn compounds  

Science Conference Proceedings (OSTI)

Nearly single-phased TiNiSn half-Heusler compound thermoelectric materials were synthesized by combining mechanical alloying (MA) and spark plasma sintering (SPS) in order to reduce its thermal conductivity by refining the grain sizes. Although TiNiSn compound powders were not synthesized directly via MA, dense bulk samples of TiNiSn compound were obtained by the subsequent SPS treatment. It was found that an excessive Ti addition relative to the TiNiSn stoichiometry is effective in increasing the phase purity of TiNiSn half-Heusler phase in the bulk samples, by compensating for the Ti loss caused by the oxidation of Ti powders and MA processing. The maximum power factor value obtained in the Ti-compensated sample is 1720 muW m{sup -1} K{sup -2} at 685 K. A relatively high ZT value of 0.32 is achieved at 785 K for the present undoped TiNiSn compound polycrystals. - Graphical abstract: Nearly single-phased TiNiSn-based half-Heusler compound polycrystalline materials with fine grains were fabricated by combining mechanical alloying (MA) and spark plasma sintering (SPS). A high ZT value for undoped TiNiSn was obtained because of the reduced thermal conductivity.

Zou Minmin [State Key Laboratory of New Ceramics and Fine Processing, Department of Materials Science and Engineering, Tsinghua University, Beijing 100084 (China); Li Jingfeng, E-mail: jingfeng@mail.tsinghua.edu.c [State Key Laboratory of New Ceramics and Fine Processing, Department of Materials Science and Engineering, Tsinghua University, Beijing 100084 (China); Du Bing; Liu Dawei [State Key Laboratory of New Ceramics and Fine Processing, Department of Materials Science and Engineering, Tsinghua University, Beijing 100084 (China); Kita, Takuji [Advanced Material Engineering Division, Vehicle Engineering Group, Higashifuji Technical Center, Toyota Motor Corporation, 1200, Mishuku, Susono, Shizuoka 410-1193 (Japan)

2009-11-15T23:59:59.000Z

Note: This page contains sample records for the topic "ti ia al" 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

High strength, light weight Ti-Y composites and method of making same  

DOE Patents (OSTI)

A high strength, light weight "in-situ" Ti-Y composite is produced by deformation processing a cast body having Ti and Y phase components distributed therein. The composite comprises elongated, ribbon-shaped Ti and Y phase components aligned along an axis of the deformed body.

Verhoeven, John D. (Ames, IA); Ellis, Timothy W. (Ames, IA); Russell, Alan M. (Ames, IA); Jones, Lawrence L. (Ames, IA)

1993-04-06T23:59:59.000Z

422

Crystallographic Consulting Brings Research to the ALS  

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

Crystallographic Consulting Brings Crystallographic Consulting Brings Research to the ALS Crystallographic Consulting Brings Research to the ALS Print Wednesday, 06 February 2013 15:50 cc Tom Pauly and Josh Stillwell, managing partners at Crystallographic Consulting, have a rich history as synchrotron users. It is likely because of this that they're entrusted with the protein crystallography research for about 15 cutting-edge pharmaceutical companies. They conduct most of their research at ALS Beamline 5.0.2. Crystallographic Consulting has a varied client base that includes many of the participating research team (PRT) members at the Berkeley Center for Structural Biology (BCSB), which operates five ALS beamlines. As PRT members, companies are guaranteed a certain amount of beam time. Crystallographic Consulting also contracts beam time for another 10-12 companies. Pauly spends about 15-20 hours a week at the ALS, with most of his research supporting pharmaceutical companies working on new treatments for metabolic diseases and cancer.

423

ALS Ceramics Materials Research Advances Engine Performance  

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

ALS Ceramics Materials Research ALS Ceramics Materials Research Advances Engine Performance ALS Ceramics Materials Research Advances Engine Performance Print Thursday, 27 September 2012 00:00 ritchie ceramics This 3D image of a ceramic composite specimen imaged under load at 1750C shows the detailed fracture patterns that researchers are able to view using ALS Beamline 8.3.2. The vertical white lines are the individual silicon carbide fibers in this sample about 500 microns in diameter. LBNL senior materials scientist and U.C. Berkeley professor Rob Ritchie has been researching the fracture behavior of a wide array of materials for the past 40 years, the last ten of them using the facilities at the ALS. From human bone to synthetic engineering materials such as shape-memory metals

424

ALS Ceramics Materials Research Advances Engine Performance  

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

ALS Ceramics Materials Research ALS Ceramics Materials Research Advances Engine Performance ALS Ceramics Materials Research Advances Engine Performance Print Thursday, 27 September 2012 00:00 ritchie ceramics This 3D image of a ceramic composite specimen imaged under load at 1750C shows the detailed fracture patterns that researchers are able to view using ALS Beamline 8.3.2. The vertical white lines are the individual silicon carbide fibers in this sample about 500 microns in diameter. LBNL senior materials scientist and U.C. Berkeley professor Rob Ritchie has been researching the fracture behavior of a wide array of materials for the past 40 years, the last ten of them using the facilities at the ALS. From human bone to synthetic engineering materials such as shape-memory metals

425

Microsoft Word - AL2005-07.doc  

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

DOE Order 361.1A, Acquisition Career Development DOE Order 361.1A, Acquisition Career Development Program, Chapter I, Contracting and Purchasing Career Development Program Module Revised DOE Core Curriculum References: DOE Order 361.1A Acquisition Career Development Program When is this Acquisition Letter (AL) Effective? This AL is effective immediately. The information and guidance provided in the AL does not apply to the National Nuclear Security Administration (NNSA). When Does This AL Expire? This AL remains in effect until superseded or canceled. Who is the Point of Contact? Contact Cynthia Yee, Director, Acquisition Career Development Program, Office of Procurement and Assistance Management at (202) 287-1666 or by email at Cynthia.Yee@hq.doe.gov. Visit our website at www.pr.doe.gov for additional information on Acquisition

426

Fer + lger Fer + lourd a Bergquist and Boyle, 2006 ; De Jong et al., 2007; Escoube et al., 2009  

E-Print Network (OSTI)

± ± ± ± ± ± ± ± ± #12; ±± ð ± #12;a Bergquist and Boyle, 2006 ; De Jong et al., 2007; Escoube et al., 2009 b Beard et al., 2003b ; Bergquist and Boyle, 2006 ; Ingri et al., 2006 ; Escoube et al., 2009 c Severmann et al., 2006; Homoky et al., 2009 ; Severmann et al., 2010. These 56Fe were observed

Lacan, Francois

427

Non-solvolytic synthesis of aqueous soluble TiO2 nanoparticles and real-time dynamic measurements of the nanoparticle formation  

E-Print Network (OSTI)

of dried bare Dpa- and GalA-TiO2 NPs. Chen et al. Nanoscale Research Letters 2012, 7:297 Page 6 of 10 http://www.nanoscalereslett.com/content/7/1/297b)these NPs may have application in solar energy capture or sunscreens. Fourier transform infrared (FT... nucleation and a growth stage by a single normal UV–vis absorbance spectrum (I-?) or a single fixed-wavelength dynamic scan (I-t) because both the nucleation and growth are, in fact, concurrent and cannot be clearly separated ei- 0 40 80 120 160 200 240 280...

Chen, Lan; Rahme, Kamil; Holmes, Justin D; Morris, Michael A; Slater, Nigel KH

2012-06-07T23:59:59.000Z

428

Status of cross-section data for gas production from vanadium and {sup 26}AL from silicon carbide in a D-T fusion reactor.  

DOE Green Energy (OSTI)

Current designs of fusion-reactor systems seek to use radiation-resistant, low-activation materials that support long service lifetimes and minimize radioactive-waste problems after decommissioning. Reliable assessment of fusion materials performance requires accurate neutron-reaction cross sections and radioactive-decay constants. The problem areas usually involve cross sections since decay parameters tend to be better known. The present study was motivated by two specific questions: (i) Why are the {sup 51}V(n,np){sup 50}Ti cross section values in the ENDF/B-VI library so large (a gas production issue)? (ii) How well known are the cross sections associated with producing 7.4 x 10{sup 5} y {sup 26}Al in silicon carbide by the process {sup 28}Si(n,np+d){sup 27} Al(n,2n){sup 26}Al (a long-lived radioactivity issue)? The energy range 14-15 MeV of the D-T fusion neutrons is emphasized. Cross-section error bars are needed so that uncertainties in the gas and radioactivity generated over the lifetime of a reactor can be estimated. We address this issue by comparing values obtained from prominent evaluated cross-section libraries. Small differences between independent evaluations indicate that a physical quantity is well known while the opposite signals a problem. Hydrogen from {sup 51}V(n,p){sup 51}Ti and helium from {sup 51}V(n,{alpha}){sup 48}Sc are also important sources of gas in vanadium, so they too were examined. We conclude that {sup 51}V(n,p){sup 51}Ti is adequately known but {sup 51}V(n,np+d){sup 50}Ti is not. The status for helium generation data is quite good. Due to recent experimental work, {sup 27}Al(n,2n){sup 26}Al seems to be fairly well known. However, the situation for {sup 28}Si(n,np+d){sup 27}Al remains unsatisfactory.

Gomes, I. C.

1998-08-11T23:59:59.000Z

429

Explanation for the temperature dependence of plasma frequencies in SrTiO{sub 3} using mixed-polaron theory  

SciTech Connect

A theory of mixed polarons is used to interpret the published experimental results of Gervais {ital et} {ital al}. on temperature-dependent plasma frequencies in Nb-doped SrTiO{sub 3}. For given polaron masses before mixing, the appropriate average mixed-polaron mass at any temperature {ital T} depends on two quantities, {delta} and {ital b}, which are measures of the separation between the bottoms of large and nearly small polaron bands before mixing and of a mixing matrix element; {delta} and {ital b} are assumed to have arbitrary linear dependences on {ital T}, probably related to a {ital T} dependence of the bare mass, and a term quadratic in {ital T} is included in {delta}, determined from the {ital T} dependence of large-polaron binding energies. Including a constraint on the ratio {delta}/{vert_bar}{ital b}{vert_bar} at low {ital T} from known masses from specific-heat data, satisfactory agreement is obtained with masses determined from plasma frequencies. This gives further support for the theory of mixed polarons in SrTiO{sub 3} in addition to that already published. {copyright} {ital 1996 The American Physical Society.}

Eagles, D.M.; Georgiev, M. [Institute of Solid State Physics, Bulgarian Academy of Sciences, 72, Tzarigradsko Chaussee Boulevard, 1784 Sofia (Bulgaria)] [Institute of Solid State Physics, Bulgarian Academy of Sciences, 72, Tzarigradsko Chaussee Boulevard, 1784 Sofia (Bulgaria); Petrova, P.C. [Institute of Nuclear Research and Nuclear Energy, Bulgarian Academy of Sciences, 72, Tzarigradsko Chaussee Boulevard, 1784 Sofia (Bulgaria)] [Institute of Nuclear Research and Nuclear Energy, Bulgarian Academy of Sciences, 72, Tzarigradsko Chaussee Boulevard, 1784 Sofia (Bulgaria)

1996-07-01T23:59:59.000Z

430

A theoretical investigation on photocatalytic oxidation on the TiO{sub 2} surface  

SciTech Connect

The TiO{sub 2} photocatalytic oxidation mechanism was theoretically investigated by using long-range corrected time-dependent density functional theory (LC-TDDFT) with a cluster model of the anatase TiO{sub 2}(001) surface. We found that LC-TDDFT with the cluster model quantitatively reproduces the photoexcitations of the TiO{sub 2} surface by calculating the electronic spectra of a clean TiO{sub 2} surface and one with oxygen defects. We calculated the electronic spectra of a molecularly adsorbed TiO{sub 2} surface for the adsorptions of phenol, methanol, and methane molecules as typical organic molecules. We obtained the surprising result that the main peak of the phenol-adsorbed TiO{sub 2} surface, which overlaps with the main peak of the clean TiO{sub 2} surface, corresponds to charge transfers from the phenol molecule to the TiO{sub 2} surface. This indicates that the TiO{sub 2} photocatalytic oxidation proceeds through direct charge transfer excitation from the substrate molecules to the TiO{sub 2} surface. In contrast, we found slight and no charge transfer for methanol and methane adsorption, respectively, in agreement with the experimental findings for their reactivities. In light of these results, we propose a new mechanism for heterogeneous TiO{sub 2} photocatalytic oxidations.

Suzuki, Satoshi [Department of Applied Chemistry, School of Engineering, University of Tokyo, Tokyo 113-8656 (Japan); Tsuneda, Takao; Hirao, Kimihiko [Advanced Science Institute, RIKEN, Wako, Saitama 351-0198 (Japan); CREST, Japan Science and Technology Agency (JST), Tokyo 113-8656 (Japan)

2012-01-14T23:59:59.000Z

431

Microsoft Word - AL2000-01.doc  

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

Letters (AL) that remain in effect are identified below. All other previously issued ALs have been Letters (AL) that remain in effect are identified below. All other previously issued ALs have been superseded by a formal rulemaking, incorporated into other guidance, and/or canceled. * * * * * * * * * * * * * * * Acquisition Letters Remaining In Effect Number Date Subject 93-4 04/07/93 Displaced Workers Benefits Program 94-19 12/09/94 Basic Labor Policies Fringe Benefits 95-06 06/28/95 Personal Property Letter System 95-14 11/17/95 Subcontracts under the New Independent States - Industrial Partnering Program 96-05 05/10/96 Trade Agreements 96-09 09/16/96 Full and Open Competition - Management and Operating Contracts 97-02 01/20/97 M&O Legal Services Subcontracts

432

ALS Reveals New State of Matter  

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

ALS Reveals New State of Matter Print ALS Reveals New State of Matter Print ALS user groups from Princeton and Stanford have been making waves this past year with several high-profile papers and extensive news coverage of their work on a new state of matter embodied by "topological insulators," materials that conduct electricity only on their surfaces. First identified at the ALS in 2007 by a Princeton team led by M. Zahid Hasan, topological insulators have been the subject of intense interest, based on unusual quantum properties that manifest themselves macroscopically. The discovery of a "second generation" of topological insulators that robustly retain these properties well above room temperature has spurred a rising tide of theoretical proposals for potential applications in nanoscale spintronic devices and fault-tolerant quantum computers. In addition, it's also been suggested that topological insulators may serve as a test bed for studies of never-before-seen particles predicted by high-energy physics.

433

Microsoft Word - al2005-04.doc  

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

1 1 Subject: CLASS DEVIATION TO REFLECT CHANGES TO THE COOPERATIVE AUDIT STRATEGY References: DEAR 970.5203-1 Management Controls DEAR 970.5232-3 Accounts, Records, and Inspection DOE Acquisition Guide Chapter 70.4 Cooperative Audit Strategy When is this Acquisition Letter (AL) Effective? This AL is effective upon issuance. The use of the clauses authorized by the attached class deviation shall be used in all solicitations and contracts in place of the parallel clauses currently contained in the DEAR. When Does This AL Expire? This AL remains in effect until superseded by the publication of a final rule incorporating the clauses that are the subject of the class deviation into the DEAR. Who is the Point of Contact?

434

ADVANCES IN SUPERPLASTIC Al-Mg MATERIALS  

Science Conference Proceedings (OSTI)

M.D. Hanna. Mass Production ... 253-264] K. Higashi. Deformation of Superplastic Al2O3/Y-TZP Particulate and ParticulateLaminate Composites [pp. 265-273

435

Microsoft Word - AL2006-09.doc  

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

6-09 (07/24/06) 6-09 (07/24/06) 1 Subject: Energy Efficiency of Energy Consuming Products - Implementation of Section 104 of the Energy Policy Act of 2005 References: Energy Policy Act of 2005, Section 104 Executive Order 13123, Greening the Government through Energy Efficient Management, Section 403 DOE Acquisition Guide Chapter 23, Greening the Government - Environmental Considerations in Contracting FAR Subpart 23.2, Energy and Water Efficiency and Renewable Energy When is this Acquisition Letter (AL) Effective? This AL is effective immediately upon issuance. When does this AL Expire? The AL remains in effect until superseded by anticipated FAR coverage or it is canceled. Who are the Points of Contact? Richard Langston, Office of Procurement and Assistance Policy, MA-61, (202) 287-1339 or

436

Microsoft Word - AL2000-05.doc  

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

Παγε 1 οφ 2 Παγε 1 οφ 2 Subject: DOE Authorized Subcontract for Use by DOE Management and Operating (M&O) Contractors with New Independent States' Scientific Institutes through the Science and Technology Center in Ukraine References: DEAR 970.7103 - Contractor Purchasing System When is this Acquisition Letter (AL) Effective? This AL is effective 10 business days from the date of issuance. When Does this AL Expire? This AL remains in effect until superseded or canceled. Who is the Point of Contact? Contact Robert Webb of the Office of Procurement and Assistance Policy at (202) 586-8264, or via e-mail at Robert.Webb@hq.doe.gov Visit our website at www.pr.doe.gov for information on Acquisition Letters and other policy

437

Microsoft Word - AL2005-16.doc  

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

6 6 Acquisition Regulation Date 10/04/05 ACQUISITION LETTER This Acquisition Letter is issued under the authority of the DOE and NNSA Procurement Executives. Subject: Implementation of HSPD-12 References: Homeland Security Presidential Directive 12 (HSPD-12) Federal Information Processing Standard Publication 201 (FIPS Pub 201) DOE Notice 206.2 Identity Proofing Acquisition Letter 2005-10 dated July 7, 2005 When is this Acquisition Letter (AL) Effective? This AL is effective upon issuance. When does this AL Expire? This AL remains in effect until superseded or canceled. Who is the Point of Contact? Contact Robert M. Webb of the Office of Procurement and Assistance Policy at (202) 287-1338 or

438

Microsoft Word - AL2005-15.doc  

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

5 5 Acquisition Regulation Date 10/05/05 ACQUISITION LETTER This Acquisition Letter is issued under the authority of the DOE and NNSA Procurement Executives. Subject: Implementation of the Price-Anderson Amendments Act of 2005 References: DEAR 970.250-70, Nuclear Hazards Indemnification Agreement. The Price-Anderson Amendments Act of 2005, §§ 601-611 of the Energy Policy Act, 2005, Pub.L. 109-58. When is this Acquisition Letter (AL) Effective? This AL is effective upon issuance. When does this AL Expire? This AL remains in effect until superseded or canceled. Who is the Point of Contact? Contact Robert M. Webb of the Office of Procurement and Assistance Policy at

439

Microsoft Word - AL2005-13.doc  

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

Department of Energy No. 2005-13 Department of Energy No. 2005-13 Acquisition Regulation Date 09/30/05 ACQUISITION LETTER This Acquisition Letter is issued under the authority of the DOE Procurement Executive. Subject: Performance-Based Service Acquisition References: FAR 37.6 Performance-Based Contracting DEAR 970.1100-1 Performance-Based Contracting DOE Acquisition Guide Chapter 37.2 Performance-Based Service Acquisition DOE Acquisition Guide Chapter 70.8 Performance-Based Contracting When is this Acquisition Letter (AL) Effective? This AL is effective 10 business days from the date of issuance. When Does this AL Expire? This AL remains in effect until superseded or canceled. Who is the Point of Contact?

440

ALS Reveals New State of Matter  

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

ALS Reveals New State of Matter Print ALS Reveals New State of Matter Print ALS user groups from Princeton and Stanford have been making waves this past year with several high-profile papers and extensive news coverage of their work on a new state of matter embodied by "topological insulators," materials that conduct electricity only on their surfaces. First identified at the ALS in 2007 by a Princeton team led by M. Zahid Hasan, topological insulators have been the subject of intense interest, based on unusual quantum properties that manifest themselves macroscopically. The discovery of a "second generation" of topological insulators that robustly retain these properties well above room temperature has spurred a rising tide of theoretical proposals for potential applications in nanoscale spintronic devices and fault-tolerant quantum computers. In addition, it's also been suggested that topological insulators may serve as a test bed for studies of never-before-seen particles predicted by high-energy physics.

Note: This page contains sample records for the topic "ti ia al" 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

ALS Reveals New State of Matter  

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

ALS Reveals New State of Matter Print ALS Reveals New State of Matter Print ALS user groups from Princeton and Stanford have been making waves this past year with several high-profile papers and extensive news coverage of their work on a new state of matter embodied by "topological insulators," materials that conduct electricity only on their surfaces. First identified at the ALS in 2007 by a Princeton team led by M. Zahid Hasan, topological insulators have been the subject of intense interest, based on unusual quantum properties that manifest themselves macroscopically. The discovery of a "second generation" of topological insulators that robustly retain these properties well above room temperature has spurred a rising tide of theoretical proposals for potential applications in nanoscale spintronic devices and fault-tolerant quantum computers. In addition, it's also been suggested that topological insulators may serve as a test bed for studies of never-before-seen particles predicted by high-energy physics.

442

Microsoft Word - al2005-06.doc  

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

2005-06 2005-06 Acquisition Regulation Date 03/11/05 ACQUISITION LETTER This Acquisition Letter is issued under the authority of the DOE and NNSA Procurement Executives. Subject: Small Business Procurement Goals References: FAR Subpart 19.7 The Small Business Subcontracting Program 13 CFR Chapter 1 Small Business Administration OFPP Letter 99-1 Small Business Procurement Goals Small Business Administration (SBA) Goaling guidelines for the Small Business Preference Programs for Prime When is this Acquisition Letter (AL) Effective? This AL is effective immediately upon issuance. When does this AL Expire? This AL remains in effect until superseded or canceled. Who is the Point of Contact? Contact Stephen Zvolensky of the Department of Energy (DOE) Office of Procurement and

443

Welding of Al- and Mg-alloys  

Science Conference Proceedings (OSTI)

Oct 9, 2012 ... Joining of Advanced and Specialty Materials (JASM XIV): Welding of Al- and ... Do and Don't for Arc Welding of Aluminum: Israel Stol1; 1Alcoa

444

High Thermal Conductivity AlN Materials  

Science Conference Proceedings (OSTI)

AlN has replaced BeO as the high thermal conductivity ceramic of choice due to the adverse health effects associated with BeO. The development of high ...

445

Western Baldwin County, AL Grid Interconnection Project  

SciTech Connect

The Objective of this Project was to provide an additional supply of electricity to the affected portions of Baldwin County, AL through the purchase, installation, and operation of certain substation equipment.

Thomas DeBell

2011-09-30T23:59:59.000Z

446

17th Annual ALS Users' Association Meeting  

E-Print Network (OSTI)

Radiation Laboratory, there was a joint SSRL- ALS workshopduring the SSRL user meeting held in the second half of theUniversity), Piero Pianetta (SSRL), Zhi-Xhu Shen (Stanford

Robinson, Art; Tamura, Lori

2004-01-01T23:59:59.000Z

447

ALS Operating Schedule on Google Calendar  

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

Operating Schedule on Google Calendar Print ALS Operating Schedule Your browser does not appear to support JavaScript, but this page needs to use JavaScript to display correctly....

448

ALS Reveals New State of Matter  

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

a new state of matter embodied by "topological insulators," materials that conduct electricity only on their surfaces. First identified at the ALS in 2007 by a Princeton team led...

449

Microsoft Word - AL2005-10.doc  

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

0 0 Acquisition Regulation Date 07/07/05 ACQUISITION LETTER This Acquisition Letter is issued under the authority of the DOE and NNSA Procurement Executives. Subject: Implementation of HSPD-12 References: Homeland Security Presidential Directive 12 (HSPD-12) Federal Information Processing Standard Publication 201 (FIPS Pub 201) When is this Acquisition Letter (AL) Effective? This AL is effective upon issuance. When does this AL Expire? This AL remains in effect until superseded or canceled. Who is the Point of Contact? Contact Robert M. Webb of the Office of Procurement and Assistance Policy at (202)287-1338 or Robert.Webb@hq.doe.gov. Visit our website at www.pr.doe.gov for information on Acquisition Letters and other policy issues.

450

Microsoft Word - AL2005-11.doc  

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

1 1 Acquisition Regulation Date 07/15/05 _ ACQUISITION LETTER This Acquisition Letter is issued under the authority of the DOE and NNSA Procurement Executives. Subject: Home Office Expenses for Management and Operating Contracts References: DEAR 970.3102-3-70 Home office expenses FAR 15.404-1 Proposal analysis techniques FAR 31.109 Advance agreements FAR Appendix B Subpart 9904.403 Allocation of home office expenses to segments When is this Acquisition Letter (AL) Effective? This AL is effective immediately upon issuance. When does this AL Expire? This AL remains in effect until superseded or canceled. Who is the Point of Contact? Contact Michael Righi of the Department of Energy (DOE) Office of Procurement and Assistance Policy at

451

IA_50m_Wind  

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

ISDataTechnologySpecificUnitedStatesWindHighResolutionIowaWindHighResolution.zip> Description: Abstract: Annual average wind resource potential for the state of Iowa at...

452

Consolidative Involved-Node Proton Therapy for Stage IA-IIIB Mediastinal Hodgkin Lymphoma: Preliminary Dosimetric Outcomes From a Phase II Study  

SciTech Connect

Purpose: To compare the dose reduction to organs at risk (OARs) with proton therapy (PT) versus three-dimensional conformal radiotherapy (3D-CRT) and intensity-modulated radiotherapy (IMRT) in patients with mediastinal Hodgkin lymphoma (HL) enrolled on a Phase II study of involved-node radiotherapy (INRT). Methods and Materials: Between June 2009 and October 2010, 10 patients were enrolled on a University of Florida institutional review board-approved protocol for de novo 'classical' Stage IA-IIIB HL with mediastinal (bulky or nonbulky) involvement after chemotherapy. INRT was planned per European Organization for Research and Treatment of Cancer guidelines. Three separate optimized plans were developed for each patient: 3D-CRT, IMRT, and PT. The primary end point was a 50% reduction in the body V4 with PT compared with 3D-CRT or IMRT. Results: The median relative reduction with PT in the primary end point, body V4, was 51% compared with 3D-CRT (p = 0.0098) and 59% compared with IMRT (p = 0.0020), thus all patients were offered treatment with PT. PT provided the lowest mean dose to the heart, lungs, and breasts for all 10 patients compared with either 3D-CRT or IMRT. The median difference in the OAR mean dose reduction with PT compared with 3D-CRT were 10.4 Gy/CGE for heart; 5.5 Gy/CGE for lung; 0.9 Gy/CGE for breast; 8.3 Gy/CGE for esophagus; and 4.1 Gy/CGE for thyroid. The median differences for mean OAR dose reduction for PT compared with IMRT were 4.3 Gy/CGE for heart, 3.1 Gy/CGE for lung, 1.4 Gy/CGE for breast, 2.8 Gy/CGE for esophagus, and 2.7 Gy/CGE for thyroid. Conclusions: All 10 patients benefitted from dose reductions to OARs with PT compared with either 3D-CRT or IMRT. It is anticipated that these reductions in dose to OAR will translate into lower rates of late complications, but long-term follow-up on this Phase II INRT study is needed.

Hoppe, Bradford S., E-mail: bhoppe@floridaproton.org [University of Florida Proton Therapy Institute, Jacksonville, FL (United States); Flampouri, Stella; Su Zhong; Morris, Christopher G. [University of Florida Proton Therapy Institute, Jacksonville, FL (United States); Latif, Naeem [University of Florida Hematology/Oncology, Jacksonville, FL (United States); Dang, Nam H.; Lynch, James [University of Florida Hematology/Oncology, Gainesville, FL (United States); Li Zuofeng; Mendenhall, Nancy P. [University of Florida Proton Therapy Institute, Jacksonville, FL (United States)

2012-05-01T23:59:59.000Z

453

High temperature superconductor step-edge Josephson junctions using Ti-Ca-Ba-Cu-O  

DOE Patents (OSTI)

A process is disclosed for formulating non-hysteretic and hysteretic Josephson junctions using HTS materials which results in junctions having the ability to operate at high temperatures while maintaining high uniformity and quality. The non-hysteretic Josephson junction is formed by step-etching a LaAlO[sub 3] crystal substrate and then depositing a thin film of TlCaBaCuO on the substrate, covering the step, and forming a grain boundary at the step and a subsequent Josephson junction. Once the non-hysteretic junction is formed the next step to form the hysteretic Josephson junction is to add capacitance to the system. In the current embodiment, this is accomplished by adding a thin dielectric layer, LaA1O[sub 3], followed by a cap layer of a normal metal where the cap layer is formed by first depositing a thin layer of titanium (Ti) followed by a layer of gold (Au). The dielectric layer and the normal metal cap are patterned to the desired geometry. 8 figs.

Ginley, D.S.; Hietala, V.M.; Hohenwarter, G.K.G.; Martens, J.S.; Plut, T.A.; Tigges, C.P.; Vawter, G.A.; Zipperian, T.E.

1994-10-25T23:59:59.000Z

454

Growth and Properties of (001)-oriented Pb(Zr?.??Ti?.??)O?/LaNiO? Films on Si(001) Substrates with TiN Buffer Layers  

E-Print Network (OSTI)

Pulsed laser deposition has been used to grow Pb(Zr?.??Ti?.??)O? (PZT)/LaNiO? (LNO) heterostructures with restricted crystallographic orientations on bare Si(001) and SiO?-coated Si(001) substrates, using TiN buffer layers. ...

Zhu, Tie-Jun

455

DOE - Office of Legacy Management -- Southern Research Institute - AL 03  

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

Southern Research Institute - AL 03 Southern Research Institute - AL 03 FUSRAP Considered Sites Site: SOUTHERN RESEARCH INSTITUTE (AL.03) Eliminated from consideration under FUSRAP Designated Name: Not Designated Alternate Name: None Location: 917 South 20th Street , Birmingham , Alabama AL.03-1 AL.03-2 Evaluation Year: 1993 AL.03-3 Site Operations: Licensed for the period 11/10/55 - 6/1/58. Basic license and three amendments for possession and title to up to 140# of refined source material for research on properties of Uranium-liquid metal fuel elements; conducted research on Uranium in the early 1960's. AL.03-4 AL.03-1 AL.03-5 Site Disposition: Eliminated - No Authority - AEC license to handle nuclear materials AL.03-3 AL.03-6 Radioactive Materials Handled: Yes Primary Radioactive Materials Handled: Uranium AL.03-1

456

Microsoft Word - AL2005-16.doc | Department of Energy  

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

6.doc Microsoft Word - AL2005-16.doc Microsoft Word - AL2005-16.doc More Documents & Publications Microsoft Word - AL2005-10.doc Audit Report: IG-0860 Policy Flash 2013-33...

457

Microsoft Word - AL2005-08.doc | Department of Energy  

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

Microsoft Word - AL2005-08.doc Microsoft Word - AL2005-08.doc More Documents & Publications Attachment FY2011-28 OPAM OPAM Policy Acquisition Guides Microsoft Word - al2004-03...

458

Microsoft Word - al2007-11.doc | Department of Energy  

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

Microsoft Word - al2007-11.doc Microsoft Word - al2007-11.doc More Documents & Publications Attachment FY2011-28 OPAM Microsoft Word - AL2005-08.doc OPAM Policy Acquisition Guides...

459

Microsoft Word - AL2005-12.doc | Department of Energy  

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

Microsoft Word - AL2005-12.doc Microsoft Word - AL2005-12.doc More Documents & Publications Microsoft Word - AL2005-11.doc Policy Flash 20012-15 OPAM Policy Acquisition Guides...

460

Microsoft Word - al2004-03.doc | Department of Energy  

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

Microsoft Word - al2004-03.doc Microsoft Word - al2004-03.doc More Documents & Publications Microsoft Word - AL2005-08.doc Attachment FY2011-28 OPAM OPAM Policy Acquisition Guides...

Note: This page contains sample records for the topic "ti ia al" 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

Microsoft Word - AL2005-07.doc | Department of Energy  

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

AL2005-07.doc Microsoft Word - AL2005-07.doc More Documents & Publications Microsoft Word - AL2006-07.doc OPAM Policy Acquisition Guides Applications for Certification (Purchasing)...

462

Microsoft Word - AL2006-01.doc | Department of Energy  

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

Microsoft Word - AL2006-01.doc Microsoft Word - AL2006-01.doc More Documents & Publications Microsoft Word - al2005-06.doc Attachment FY2011-28 OPAM OPAM Policy Acquisition Guides...

463

Simulation of the ALS Longitudinal Multibunch Feedback System  

E-Print Network (OSTI)

Higher-order Modes of the ALS 500 MHz Accelerating Cavities,in the system. RESULTS The ALS and FB parameters used for33271 Simulation of the ALS Longitudinal Multibunch Feedback

Byrd, J.M.

2011-01-01T23:59:59.000Z

464

Design of the ALS Transverse Coupled-bunch Feedback System  

E-Print Network (OSTI)

LBL-33269 Design of the ALS Transverse Coupled-BunchESG-231 LSAP-141 Design of the ALS Transverse Coupled-bunchCol- lective Effects in the ALS, these proceedings. [3] J.

Barry, W.

2011-01-01T23:59:59.000Z

465

Slow Orbit Feedback at the ALS Using Matlab  

E-Print Network (OSTI)

Measurement of Storage Ring Motion at the ALS," PAC [4] G.Portmann, "ALS Storage Ring Setup and Control Using MatlabSlow Orbit Feedback at the ALS Using Matlab G_ Port mann

Portmann, G.

2011-01-01T23:59:59.000Z

466

At-wavelength Optical Metrology Development at the ALS  

E-Print Network (OSTI)

upgraded LTP-II at the ALS Optical Metrology Laboratory,”of Energy, LBL, LBNL, ALS, or BNL, nor does it imply thatSlope Metrology with the ALS Developmental Long Trace

Yuan, Sheng Sam

2010-01-01T23:59:59.000Z

467

Longitudinal and Transverse Feedback Kickers for the ALS  

E-Print Network (OSTI)

Collective Effects in the ALS", 1. M. Byrd and J. Corlett,Feedback Kickers for the ALS J. N. Corlett, J. Johnson, G.bunch feedback systems at the ALS. Transverse kickers are of

Corlett, J.N.

2011-01-01T23:59:59.000Z

468

Study of Coupled-Bunch Collective in the ALS  

E-Print Network (OSTI)

Collective Effects in the ALS J.M. Byrd and IN. CorlettCollective Effects in the ALS' J. M. Byrd and J. N. Corlettthe Advanced Light Source (ALS), a 1.5 GeV electron storage

Byrd, J.M.

2011-01-01T23:59:59.000Z

469

Hom dampers for ALS storage ring RF cavities  

E-Print Network (OSTI)

of the HOM dampers on ALS rf cavities was an immediatesuccess. Now, the ALS storage ring can operate with the 312The cross-section of the ALS third harmonic cavity with two

2003-01-01T23:59:59.000Z

470

Klystron "efficiency loop" for the ALS storage ring RF system  

E-Print Network (OSTI)

EFFICIENCY LOOP” FOR THE ALS STORAGE RING RF SYSTEM* S.at the Advanced Light Source (ALS) in order to decrease thethe cavities. 1 INTRODUCTION ALS Storage Ring RF system is

Kwiatkowski, Slawomir; Julian, Jim; Baptiste, Kenneth

2002-01-01T23:59:59.000Z

471

Study of a 'Relaxed' ALS Storage Ring Lattice  

E-Print Network (OSTI)

Proceedings Study of a 'Relaxed' ALS Storage Ring Lattice R.76SF00098. STUDY OF A 'RELAXED' ALS STORAGE RING LATTICE' R.f the Advanced Light Source (ALS) 1-1.9 GeV electron stornge

Keller, R.

2010-01-01T23:59:59.000Z

472

Noise reduction efforts for the ALS infrared beamlines  

E-Print Network (OSTI)

is being commissioned at the ALS that should help quietalso has links to the main ALS Infrared Website, where PDF’sNoise reduction efforts for the ALS infrared beamlines Tom

2003-01-01T23:59:59.000Z

473

Compensation of Beam Loading in the ALS Injector Linac  

E-Print Network (OSTI)

to offset the beam loading. ALS Injector Requirements Gun.gun, bunchers, and 50 MeV linac of the ALS injection system.The ALS injector design has been described in previous

Selph, F.

1988-01-01T23:59:59.000Z

474

Transient beam loading in the ALS harmonic RF system  

E-Print Network (OSTI)

TRANSIENT BEAM LOADING IN THE ALS HARMONIC RF SYSTEM * J.as the Advanced Light Source (ALS), with moderately low beamharmonic RF system on the ALS storage ring consisting of 5

2000-01-01T23:59:59.000Z

475

CIRCE, the Coherent Infrared Center at the ALS  

E-Print Network (OSTI)

INFRARED CENTER AT THE ALS* J. M. Byrd, S. De Santis, J-Yat the Advanced Light Source (ALS) of the Lawrence Berkeleyinfrared radiation from the ALS generated via femtosecond

2004-01-01T23:59:59.000Z

476

Current Status of Ti PM: Progress, Opportunities and Challenges  

SciTech Connect

Utilization of titanium components made by powder metallurgy methods has had limited acceptance largely due to the high cost of titanium (Ti) powder. There has been renewed interest in lower cost powder and several Ti reduction methods that produce a particulate product show promise. This talk summarizes work done at Oak Ridge National Laboratory to consolidate these lower cost powders into mill products. Press and sinter consolidation, hot isostatic pressing (HIP) and direct roll consolidation to make sheet have been explored. The characteristics of the consolidated products will be described as a function of the consolidation parameters. Research sponsored by the U.S. Department of Energy, Office of Energy Efficiency and Renewable Energy, Industrial Technologies Program, under contract DE-AC05-00OR22725 with UT-Battelle, LLC.

Peter, William H [ORNL; Chen, Wei [ORNL; Yamamoto, Yukinori [ORNL; Dehoff, Ryan R [ORNL; Muth, Thomas R [ORNL; Nunn, Stephen D [ORNL; Kiggans, Jim [