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Note: This page contains sample records for the topic "microearthquake shear-wave splitting" from the National Library of EnergyBeta (NLEBeta).
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1

Shear-wave splitting and reservoir crack characterization: the Coso  

Open Energy Info (EERE)

Shear-wave splitting and reservoir crack characterization: the Coso Shear-wave splitting and reservoir crack characterization: the Coso geothermal field Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Journal Article: Shear-wave splitting and reservoir crack characterization: the Coso geothermal field Details Activities (1) Areas (1) Regions (0) Abstract: This paper aims to improve current understanding of the subsurface fracture system in the Coso geothermal field, located in east-central California. The Coso reservoir is in active economic development, so that knowledge of the subsurface fracture system is of vital importance for an accurate evaluation of its geothermal potential and day-to-day production. To detect the geometry and density of fracture systems we applied the shear-wave splitting technique to a large number of

2

Complex component analysis of shear-wave splitting: case studies  

Science Journals Connector (OSTI)

......geophones (Bush & Crampin 1987). We shall process only the S1 offset at 272m. This case...of the two shear-wave arrivals. The process depends on the coherency of the polarization...azimuthal anisotropy, 56th Ann. h i . SEG Mtg, Houston, Expanded Abstracts, pp......

Xiang-Yang Li; Stuart Crampin

1991-12-01T23:59:59.000Z

3

Shear-Wave Splitting and Implications for Mantle Flow Beneath the MELT Region of the  

E-Print Network (OSTI)

Rise Cecily J. Wolfe* and Sean C. Solomon Shear-wave splitting across the fast-spreading East Pacific network. Our splitting analysis follows stan- dard methodology (3), as adapted (10) for deriving optimum Hole Oceanographic Institution, Woods Hole, MA 02543, USA. S. C. Solomon, Department of Terrestrial

Wolfe, Cecily J.

4

Shear-wave splitting as a tool for the characterization of geothermal  

Open Energy Info (EERE)

as a tool for the characterization of geothermal as a tool for the characterization of geothermal fractured reservoirs: lessons learned Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Journal Article: Shear-wave splitting as a tool for the characterization of geothermal fractured reservoirs: lessons learned Details Activities (1) Areas (1) Regions (0) Abstract: We review our experience with the construction of models of subsurface fracturing in geothermal fields by the inversion of shear-wave splitting (SWS) observations from natural and induced seismic events recorded by local arrays of three-component digital seismometers. SWS is a phenomenon whereby shear seismic waves split into two as a result of the mechanical anisotropy created in an otherwise isotropic rock by aligned micro-fractures. The two split waves travel at different speeds, and the

5

Characterization of geothermal reservoir crack patterns using shear-wave  

Open Energy Info (EERE)

geothermal reservoir crack patterns using shear-wave geothermal reservoir crack patterns using shear-wave splitting Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Journal Article: Characterization of geothermal reservoir crack patterns using shear-wave splitting Details Activities (1) Areas (1) Regions (0) Abstract: Microearthquakes recorded by a downhole, three-component seismic network deployed around the Coso, California, geothermal reservoir since 1992 display distinctive shear-wave splitting and clear polarization directions. From the polarizations the authors estimated three predominant subsurface fracture directions, and from the time delays of the split waves they determined tomographically the 3-D fracture density distribution in the reservoir. Author(s): Lou, M.; Rial, J.A. Published: Geophysics, 3/1/1997

6

Attenuation anisotropy and the relative frequency content of split shear waves  

Science Journals Connector (OSTI)

......several important applications. First, in geothermal applications water is pumped from an injector...simple, and requires no extra acquisition costs beyond those required for the shear-wave...attenuation quantifies the difference in energy loss per cycle experienced by S1 and S2......

Andrew J. Carter; J.-Michael Kendall

2006-06-01T23:59:59.000Z

7

Micro-Earthquake At Coso Geothermal Area (1992-1997) | Open Energy  

Open Energy Info (EERE)

2-1997) 2-1997) Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Exploration Activity: Micro-Earthquake At Coso Geothermal Area (1992-1997) Exploration Activity Details Location Coso Geothermal Area Exploration Technique Micro-Earthquake Activity Date 1992 - 1997 Usefulness useful DOE-funding Unknown Exploration Basis Characterize subsurface fracture patterns in the Coso geothermal reservoir by analyzing shear-wave splitting of microearthquake seismorgrams Notes A large number of microearthquake seismograms have been recorded by a downhole, three-component seismic network. Shear-wave splitting induced by the alignment of cracks in the reservoir has been widely observed in the recordings. Over 100 events with body wave magnitude greater than 1.0 from

8

Shear-wave splitting as a tool for the characterization of geothermal...  

Open Energy Info (EERE)

SWS is a phenomenon whereby shear seismic waves split into two as a result of the mechanical anisotropy created in an otherwise isotropic rock by aligned micro-fractures. The...

9

Micro-Earthquake At Coso Geothermal Area (2005) | Open Energy Information  

Open Energy Info (EERE)

5) 5) Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Exploration Activity: Micro-Earthquake At Coso Area (2005) Exploration Activity Details Location Coso Geothermal Area Exploration Technique Micro-Earthquake Activity Date 2005 Usefulness useful DOE-funding Unknown Notes Characterization of 3D Fracture Patterns at The Geysers and Coso Geothermal Reservoirs by Shear-wave Splitting, Rial, Elkibbi, Yang and Pereyra. The raw data for the project consists of seismographic recordings of microearthquakes (MEQ) detected over many years by arrays of sensors at both The Geysers and Coso. References Patrick Laney (2005) Federal Geothermal Research Program Update - Fiscal Year 2004 Retrieved from "http://en.openei.org/w/index.php?title=Micro-Earthquake_At_Coso_Geothermal_Area_(2005)&oldid=475476"

10

Micro-Earthquake At Coso Geothermal Area (2002-2005) | Open Energy  

Open Energy Info (EERE)

-2005) -2005) Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Exploration Activity: Micro-Earthquake At Coso Geothermal Area (2002-2005) Exploration Activity Details Location Coso Geothermal Area Exploration Technique Micro-Earthquake Activity Date 2002 - 2005 Usefulness not indicated DOE-funding Unknown Exploration Basis To improve understanding of the subsurface fracture system Notes A shear-wave splitting technique was applied on a set of high quality, locally recorded microearthquake (MEQ) data. Four major fracture directions have been identified from the seismograms recorded by the permanent 16-station down-hole array: N10- 20W, NS, N20E, and N40-45E, of which the first and the third are the most prominent. All orientations are consistent with the known strike of local sets of faults and fractures at depth and at

11

Micro-Earthquake At Geysers Area (Laney, 2005) | Open Energy Information  

Open Energy Info (EERE)

Laney, 2005) Laney, 2005) Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Exploration Activity: Micro-Earthquake At Geysers Area (Laney, 2005) Exploration Activity Details Location Geysers Area Exploration Technique Micro-Earthquake Activity Date Usefulness useful DOE-funding Unknown Notes Characterization of 3D Fracture Patterns at The Geysers and Coso Geothermal Reservoirs by Shear-wave Splitting, Rial, Elkibbi, Yang and Pereyra. The raw data for the project consists of seismographic recordings of microearthquakes (MEQ) detected over many years by arrays of sensors at both The Geysers and Coso. References Patrick Laney (2005) Federal Geothermal Research Program Update - Fiscal Year 2004 Retrieved from "http://en.openei.org/w/index.php?title=Micro-Earthquake_At_Geysers_Area_(Laney,_2005)&oldid=389456

12

Micro-Earthquake At Geysers Area (Erten & Rial, 1999) | Open...  

Open Energy Info (EERE)

useful DOE-funding Unknown References D. Erten, J. A. Rial (1999) Characterization Of Fracture Patterns In The Geysers Geothermal Reservoir By Shear-Wave Splitting Additional...

13

Micro-Earthquake At Kilauea East Rift Geothermal Area (Kenedi...  

Open Energy Info (EERE)

to this study: Shear wave splitting, double difference earthquake location, and 3-D tomography. This study was beneficial in helping to improve the local velocity model, identify...

14

Micro-Earthquake At Coso Geothermal Area (2011) | Open Energy Information  

Open Energy Info (EERE)

) ) Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Exploration Activity: Micro-Earthquake At Coso Geothermal Area (2011) Exploration Activity Details Location Coso Geothermal Area Exploration Technique Micro-Earthquake Activity Date 2011 Usefulness not indicated DOE-funding Unknown Exploration Basis To analyze temporal velocity variations Notes Microseismic data recorded between 1996 and 2008 was used to determine the temporally varying seismic velocity of the Coso geothermal field. In this study, the double difference tomography method was applied to simultaneously locate a suite of microseismic events and determine the compressional and shear wave velocity as well as their ratio. References Seher, T.; Zhang, H.; Fehler, M.; Yu, H.; Soukhovitskaya, V.;

15

Microearthquake Technology for EGS Fracture Characterization...  

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

Microearthquake Technology for EGS Fracture Characterization; 2010 Geothermal Technology Program Peer Review Report Microearthquake Technology for EGS Fracture Characterization;...

16

Shear-wave splitting and reservoir crack characterization: the...  

Open Energy Info (EERE)

field Abstract This paper aims to improve current understanding of the subsurface fracture system in the Coso geothermal field, located in east-central California. The Coso...

17

A Comprehensive Study Of Fracture Patterns And Densities In The...  

Open Energy Info (EERE)

Study Of Fracture Patterns And Densities In The Geysers Geothermal Reservoir Using Microearthquake Shear-Wave Splitting Tomography Jump to: navigation, search OpenEI Reference...

18

Shear-wave crosswell reflection imaging in west Texas  

SciTech Connect

Crosswell reflection imaging was recently introduced as a method for high-resolution (of the order of a few feet) imaging of reservoirs. P-wave imaging was successfully tested on short and intermediate-offset crosswell profiles. Although shear-wave imaging was demonstrated with a short-offset (187 feet) data set, it was generally believed that high-frequency shear imaging at larger interwell distances might not be feasible, because the high-frequency shear waves will suffer large attenuation losses, resulting in poor signal-to-noise ratios for the shear-wave reflections. In this paper the authors present a real-data study, illustrating that shear-wave imaging was feasible at a west Texas carbonate reservoir for an interwell distance of 586 feet. Although the shear direct arrival and reflections are not always evident in the raw gathers processing and stacking enhances them enough to allow imaging of the interwell area for the whole depth range covered by the survey. The results clearly indicate that further work on shear-wave crosswell reflection imaging is warranted.

Lazaratos, S.K.; Marion, B.P. [TomoSeis Inc., Houston, TX (United States); Langan, R. [Chevron Petroleum Technology, La Habra, CA (United States); Harris, J.M. [Stanford Univ., CA (United States)

1994-12-31T23:59:59.000Z

19

Micro-Earthquake | Open Energy Information  

Open Energy Info (EERE)

Micro-Earthquake Micro-Earthquake Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Exploration Technique: Micro-Earthquake Details Activities (33) Areas (16) Regions (2) NEPA(1) Exploration Technique Information Exploration Group: Geophysical Techniques Exploration Sub Group: Seismic Techniques Parent Exploration Technique: Passive Seismic Techniques Information Provided by Technique Lithology: Stratigraphic/Structural: Fault zones, permeable pathways Hydrological: Fluid type- liquid or steam Thermal: Dictionary.png Micro-Earthquake: The micro-earthquake technique (MEQ), also known as microseismic, utilizes vibrations in the subsurface to locate permeable pathways and determine fluid phase. Other definitions:Wikipedia Reegle Use in Geothermal Exploration Ground noise and micro-earthquakes (MEQ) may be utilized in the

20

Microearthquake Technology for EGS Fracture Characterization...  

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

1 4.5.1 Microearthquake Technology for EGS Fracture Characterization Presentation Number: 021 Investigator: Foulger, Gillian (Foulger Consulting) Objectives: To understand how EGS...

Note: This page contains sample records for the topic "microearthquake shear-wave splitting" 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

Shear wave dispersion ultrasound vibrometry of gel dosimetry phantoms.  

Science Journals Connector (OSTI)

Shear wavedispersionultrasound vibrometry (SDUV) has been introduced to use the dispersive nature of shear wave speed to locally estimate the material properties or tissue. Shear waves were created using a mechanical shaker and pulsed radiation force. Using the information from the phase one can estimate the shear velocity. A theoretical Voigt model allows us to find at different frequencies (100–400 Hz) the viscosity and shear elasticity of the polymer gel dosimeter. The aim of this work was to perform the SDUV and mechanical vibrometry techniques to study the viscoelastic properties of absorbed dose phantoms. The experiments were performed using five phantoms of different absorbed doses varying 10 up to 50 Gy while a nonirradiated phantom was kept as a control. The SDUV technique was performed using a pulsed radiation force to vibrate the gel provide by a confocal transducer with a focal depth of 70 mm nominal frequency of 3 MHz. For the mechanical vibrometry and SDUV experiments shear wave motion measurements were made with a commercial ultrasound machine with a research using a 10 MHz linear array transducer. The quantitative elasticity and viscosity results for these two experiments were compared.

2009-01-01T23:59:59.000Z

22

Visualization of Microearthquake Data from Enhanced Geothermal...  

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

site operators - and the public - to see where microearthquakes are occurring as geothermal energy is produced at a site. The 3D visualizations are being made available via a Web...

23

Shear-wave reflection seismics as a valuable tool for near-surface urban applications  

Science Journals Connector (OSTI)

...medium-scale shear-wave source (hydraulic mini-vibrator MHV4S) reaches...streamer is transported on a trailer-mounted winch (a), and...Surveying down to 300 m (hydraulic shear-wave vibrator plus...use of fully biodegradable hydraulic fluids and consideration of...

Charlotte M. Krawczyk; Ulrich Polom; Thies Beilecke

24

Detonation loading of tubes in the modified shear wave speed regime  

E-Print Network (OSTI)

Detonation loading of tubes in the modified shear wave speed regime T. Chao and J. E. Shepherd detonation loading in the modified shear wave speed regime. Strain gauges were used to determine the time and numerical simulations with explicit finite element computation treating the detonation as a traveling load

25

Micro-Earthquake At Long Valley Caldera Geothermal Area (Foulger...  

Open Energy Info (EERE)

Microearthquakes At Long Valley Caldera, California, Provide Evidence For Hydraulic Fracturing Additional References Retrieved from "http:en.openei.orgw...

26

Shear wave seismic velocity profiling and depth to water table earthquake site  

E-Print Network (OSTI)

..................................................................................................... 6 Summary of seismic refraction/reflection methodsShear wave seismic velocity profiling and depth to water table ­ earthquake site response measurements for Valley County, Idaho Lee M. Liberty and Gabriel M. Gribler, Boise State University Center

Barrash, Warren

27

The Wavefield of an Ultrasonic Angle Beam Shear Wave Transducer: An Elastodynamic Approach  

Science Journals Connector (OSTI)

Inspection of welded plate and pipe assemblies with ultrasonic angle beam shear wave transducers is an important and common application of ultrasonic NDE. With the advent of the Thompson and Gray measurement m...

Terence P. Lerch; Lester W. Schmerr…

1997-01-01T23:59:59.000Z

28

Measurement of sound speed vs. depth in South Pole ice: pressure waves and shear waves  

E-Print Network (OSTI)

Price, Attenuation of acoustic waves in glacial ice and saltacoustics, South Pole, sound speed, pressure waves,shear waves PACS: 47.35.De, 47.35.Rs, 62.65. +k, 92.40.Vq,

Klein, Spencer

2010-01-01T23:59:59.000Z

29

Conducting a 3D Converted Shear Wave Project to Reduce Exploration...  

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

shear wave) seismic survey to reduce exploration risk by characterizing fault and fracture geometrics at Wister, CA.The intent of the proposed program is to use a 3D seismic...

30

Conducting a 3D Converted Shear Wave Project to Reduce Exploration...  

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

shear wave) seismic survey to reduce exploration risk by characterizing fault and fracture geometrics at Wister, CA. The intent of the proposed program is to use a 3D seismic...

31

Anomalous shear wave attenuation in the shallow crust beneath the Coso  

Open Energy Info (EERE)

Anomalous shear wave attenuation in the shallow crust beneath the Coso Anomalous shear wave attenuation in the shallow crust beneath the Coso volcanic region, California Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Journal Article: Anomalous shear wave attenuation in the shallow crust beneath the Coso volcanic region, California Details Activities (1) Areas (1) Regions (0) Abstract: We use seismograms of local earthquakes to image relative shear wave attenuation structure in the shallow crust beneath the region containing the Coso volcanic-geothermal area of eastern California. SV and P wave amplitudes were measured from vertical component seismograms of earthquakes that occurred in the Coso-southern Sierra Nevada region from July 1983 to 1985. Seismograms of 16 small earthquakes show SV amplitudes which are greatly diminished at some azimuths and takeoff angles,

32

Conducting a 3D Converted Shear Wave Project to Reduce Exploration Risk at Wister, CA  

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

DOE Geothermal Technologies Peer Review 2010 - Presentation. The primary objective of this project is to conduct a 3C 3D (converted shear wave) seismic survey to reduce exploration risk by characterizing fault and fracture geometrics at Wister, CA.The intent of the proposed program is to use a 3D seismic survey with converted shear waves combined with other available data to site and drill production wells at Wister, a blind geothermal resource.

33

Micro-Earthquake At Roosevelt Hot Springs Geothermal Area (Zandt...  

Open Energy Info (EERE)

Activity Details Location Roosevelt Hot Springs Geothermal Area Exploration Technique Micro-Earthquake Activity Date 1982 Usefulness not indicated DOE-funding Unknown...

34

Non-Double-Couple Microearthquakes At Long Valley Caldera, California...  

Open Energy Info (EERE)

Microearthquakes At Long Valley Caldera, California, Provide Evidence For Hydraulic Fracturing Jump to: navigation, search OpenEI Reference LibraryAdd to library...

35

Micro-Earthquake At North Brawley Geothermal Area (Hauksson,...  

Open Energy Info (EERE)

Hauksson, Et Al., 2012) Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Exploration Activity: Micro-Earthquake At North Brawley Geothermal Area (Hauksson, Et Al.,...

36

A review of shear wave splitting in the crack-critical crust  

Science Journals Connector (OSTI)

......transverse isotropy (hexagonal anisotropic symmetry) with a vertical...also characteristic of many shales, clays and mudstones, where...transverse isotropy (hexagonal anisotropic symmetry) with a horizontal...compressional stress so that the anisotropic symmetry is only approximately......

Stuart Crampin; Sebastien Chastin

2003-10-01T23:59:59.000Z

37

Inversion for subsurface anisotropy using estimates of shear-wave splitting  

Science Journals Connector (OSTI)

......wave propagation in anisotropic media, J. Geophys...Traveltime tomography in anisotropic media: application...anisotropy in Pierre Shale, Geophys. Prosp...Traveltime tomography in anisotropic media: application...anisotropy in Pierre Shale, Geophys. Prosp......

Colin MacBeth

1991-12-01T23:59:59.000Z

38

Shear wave splitting in the crust in North China: stress, faults and tectonic implications  

Science Journals Connector (OSTI)

......caution. 3 Tectonics A large tectonic zone, North China (NC), is also a large administrative region...striking WNW outline the large Zhangjiakou-Bohai tectonic...source mechanisms and borehole drilling data suggest that the......

Yuan Gao; Jing Wu; Yoshio Fukao; Yutao Shi; Ailan Zhu

2011-11-01T23:59:59.000Z

39

Characterizing hydraulically fractured reservoirs using induced microearthquakes  

SciTech Connect

Hydraulic fracturing is a common method employed to increase the production of oil and gas fields. Recently, there has been increased interest in monitoring the microearthquakes induced by hydraulic fracturing as a means of obtaining data to characterize reservoir changeS induced by the injection. Two types of microearthquakes have been observed during hydraulic fracturing. Tensile events have been observed and modeled as the parting of the surfaces of a fracture. A majority of the events observed have been shear-slip events, where two sides of a fault plane slip parallel to each other but in opposite directions. The locations of the microearthquakes can be analyzed to determine regions where significant seismic energy was released, which presumably are regions where injected fluid penetrated into the rock along pre-existing fractures or zones of weakness. The spatial patterns in the locations can be analyzed to fine regions where events cluster along planes, which are interpreted to be the dominant fluid flow paths. Imaging methods can also be applied to the travel time and waveform data to obtain direct evidence for the locations of the fractures or fracture zones. 27 refs., 2 figs.

Fehler, M.

1991-01-01T23:59:59.000Z

40

Micro-Earthquake At Marysville Mt Area (Blackwell) | Open Energy  

Open Energy Info (EERE)

Area (Blackwell) Area (Blackwell) Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Exploration Activity: Micro-Earthquake At Marysville Mt Area (Blackwell) Exploration Activity Details Location Marysville Mt Area Exploration Technique Micro-Earthquake Activity Date Usefulness not indicated DOE-funding Unknown Notes A seismic ground noise was carried out but the ground noise in the anomaly area (and the surrounding region) was extremely low, approximately 4 orders of magnitude below that observed in the geothermal areas in the Salton Sea between 1-10 Hz (in units of power density). Because of this very low background noise the micro-earthquake survey was possible with instrument gains well in excess of a million. Regional micro-earthquake activity was located within about 15 km of the geothermal area but no micro-earthquakes

Note: This page contains sample records for the topic "microearthquake shear-wave splitting" 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

Multiple Ruptures For Long Valley Microearthquakes- A Link To Volcanic  

Open Energy Info (EERE)

Multiple Ruptures For Long Valley Microearthquakes- A Link To Volcanic Multiple Ruptures For Long Valley Microearthquakes- A Link To Volcanic Tremor(Question) Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Journal Article: Multiple Ruptures For Long Valley Microearthquakes- A Link To Volcanic Tremor(Question) Details Activities (1) Areas (1) Regions (0) Abstract: Despite several episodes of ground deformation and intense seismic activity starting in 1978, the Long Valley, California, volcanic area has not produced clearly recognized volcanic tremor. Instead, a variety of atypical microearthquakes have been recorded during these episodes, including events dominated by low-frequency (long-period) or mixed high and low-frequency (hybrid) signals. During a 1997 episode, a number of unusual microearthquakes occurred within a temporary 40-station

42

Transmission, attenuation and reflection of shear waves in the human brain  

Science Journals Connector (OSTI)

...reflection of shear waves in the human brain Erik H. Clayton 1 * Guy M. Genin 1 Philip...1185, St Louis, MO 63130, USA Traumatic brain injuries (TBIs) are caused by acceleration...methods to measure the motion of the human brain in vivo as the skull was exposed to harmonic...

2012-01-01T23:59:59.000Z

43

Microearthquake moment tensors from the Coso Geothermal area | Open Energy  

Open Energy Info (EERE)

Microearthquake moment tensors from the Coso Geothermal area Microearthquake moment tensors from the Coso Geothermal area Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Conference Proceedings: Microearthquake moment tensors from the Coso Geothermal area Details Activities (1) Areas (1) Regions (0) Abstract: The Coso geothermal area, California, has produced hot water and steam for electricity generation for more than 20 years, during which time there has been a substantial amount of microearthquake activity in the area. Seismicity is monitored by a high-quality permanent network of 16 three-component digital borehole seismometers operated by the US Navy and supplemented by a ~ 14-station portable array of surface three-component digital instruments. The portable stations improve focal sphere coverage, providing seismic-wave polarity and amplitude data sets sufficient for

44

Non-Double-Couple Microearthquakes At Long Valley Caldera, California,  

Open Energy Info (EERE)

Non-Double-Couple Microearthquakes At Long Valley Caldera, California, Non-Double-Couple Microearthquakes At Long Valley Caldera, California, Provide Evidence For Hydraulic Fracturing Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Journal Article: Non-Double-Couple Microearthquakes At Long Valley Caldera, California, Provide Evidence For Hydraulic Fracturing Details Activities (1) Areas (1) Regions (0) Abstract: Most of 26 small (0.4<~M<~3.1) microearthquakes at Long Valley caldera in mid-1997, analyzed using data from a dense temporary network of 69 digital three-component seismometers, have significantly non-double-couple focal mechanisms, inconsistent with simple shear faulting. We determined their mechanisms by inverting P- and S-wave polarities and amplitude ratios using linear-programming methods, and

45

Heat flow and microearthquake studies, Coso Geothermal Area, China Lake,  

Open Energy Info (EERE)

and microearthquake studies, Coso Geothermal Area, China Lake, and microearthquake studies, Coso Geothermal Area, China Lake, California. Final report Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Book: Heat flow and microearthquake studies, Coso Geothermal Area, China Lake, California. Final report Details Activities (2) Areas (1) Regions (0) Abstract: The present research effort at the Coso Geothermal Area located on the China Lake Naval Weapons Center, China Lake, California, was concerned with: (1) heat flow studies and (2) microearthquake studies associated with the geothermal phenomena in the Coso Hot Springs area. The sites for ten heat flow boreholes were located primarily using the available seismic ground noise and electrical resistivity data. Difficulty was encountered in the drilling of all of the holes due to altered, porous,

46

Characterizing Fractures in the Geysers Geothermal Field by Micro-seismic Data, Using Soft Computing, Fractals, and Shear Wave Anisotropy  

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

Characterizing Fractures in the Geysers Geothermal Field by Micro-seismic Data, Using Soft Computing, Fractals, and Shear Wave Anisotropy presentation at the April 2013 peer review meeting held in Denver, Colorado.

47

Detailed Joint Structure in a Geothermal Reservoir from Studies of Induced Microearthquake Clusters  

E-Print Network (OSTI)

microearthquake data collected from a geothermal reservoir at Fenton Hill, New Mexico, provide an opportunityDetailed Joint Structure in a Geothermal Reservoir from Studies of Induced Microearthquake Clusters Alamos National Laboratory, Los Alamos, New Mexico LAUR 94-3846 #12;2 Abstract Microearthquake clusters

48

Microearthquake Studies at the Salton Sea Geothermal Field  

DOE Data Explorer (OSTI)

The objective of this project is to detect and locate microearthquakes to aid in the characterization of reservoir fracture networks. Accurate identification and mapping of the large numbers of microearthquakes induced in EGS is one technique that provides diagnostic information when determining the location, orientation and length of underground crack systems for use in reservoir development and management applications. Conventional earthquake location techniques often are employed to locate microearthquakes. However, these techniques require labor-intensive picking of individual seismic phase onsets across a network of sensors. For this project we adapt the Matched Field Processing (MFP) technique to the elastic propagation problem in geothermal reservoirs to identify more and smaller events than traditional methods alone.

Templeton, Dennise

49

Microearthquake Studies at the Salton Sea Geothermal Field  

SciTech Connect

The objective of this project is to detect and locate microearthquakes to aid in the characterization of reservoir fracture networks. Accurate identification and mapping of the large numbers of microearthquakes induced in EGS is one technique that provides diagnostic information when determining the location, orientation and length of underground crack systems for use in reservoir development and management applications. Conventional earthquake location techniques often are employed to locate microearthquakes. However, these techniques require labor-intensive picking of individual seismic phase onsets across a network of sensors. For this project we adapt the Matched Field Processing (MFP) technique to the elastic propagation problem in geothermal reservoirs to identify more and smaller events than traditional methods alone.

Templeton, Dennise

2013-10-01T23:59:59.000Z

50

Measurement of sound speed vs. depth in South Pole ice: pressure waves and shear waves  

SciTech Connect

We have measured the speed of both pressure waves and shear waves as a function of depth between 80 and 500 m depth in South Pole ice with better than 1% precision. The measurements were made using the South Pole Acoustic Test Setup (SPATS), an array of transmitters and sensors deployed in the ice at the South Pole in order to measure the acoustic properties relevant to acoustic detection of astrophysical neutrinos. The transmitters and sensors use piezoceramics operating at {approx}5-25 kHz. Between 200 m and 500 m depth, the measured profile is consistent with zero variation of the sound speed with depth, resulting in zero refraction, for both pressure and shear waves. We also performed a complementary study featuring an explosive signal propagating vertically from 50 to 2250 m depth, from which we determined a value for the pressure wave speed consistent with that determined for shallower depths, higher frequencies, and horizontal propagation with the SPATS sensors. The sound speed profile presented here can be used to achieve good acoustic source position and emission time reconstruction in general, and neutrino direction and energy reconstruction in particular. The reconstructed quantities could also help separate neutrino signals from background.

IceCube Collaboration; Klein, Spencer

2009-06-04T23:59:59.000Z

51

HYDRAULIC STIMULATION OF NATURAL FRACTURES AS REVEALED BY INDUCED MICROEARTHQUAKES,  

E-Print Network (OSTI)

-1- HYDRAULIC STIMULATION OF NATURAL FRACTURES AS REVEALED BY INDUCED MICROEARTHQUAKES, CARTHAGE, December, 2001 Manuscript # 01066 LAUR# 01-1204 #12;Hydraulic Stimulation of Natural Fractures -2- ABSTRACT We have produced a high-resolution microseismic image of a hydraulic fracture stimulation

52

Foulger, G.R., Microearthquake Analysis Techniques For Geothermal Applications, EOS Trans. AGU, Fall Meet. Suppl., Abstract S32B-02 (invited), 2009.  

E-Print Network (OSTI)

urgency to develop renewable energy resources, including geothermal power, and in particular EnhancedFoulger, G.R., Microearthquake Analysis Techniques For Geothermal Applications, EOS Trans. AGU And Induced Microearthquakes Microearthquake Analysis Techniques For Geothermal Applications The increased

Foulger, G. R.

53

Viscosity, Shear Waves, and Atomic-Level Stress-Stress Correlations  

SciTech Connect

The Green-Kubo equation relates the macroscopic stress-stress correlation function to a liquid's viscosity. The concept of the atomic-level stresses allows the macroscopic stress-stress correlation function in the equation to be expressed in terms of the space-time correlations among the atomic-level stresses. Molecular dynamics studies show surprisingly long spatial extension of stress-stress correlations and also longitudinal and transverse waves propagating in liquids over ranges which could exceed the system size. The results reveal that the range of propagation of shear waves corresponds to the range of distances relevant for viscosity. Thus our results show that viscosity is a fundamentally nonlocal quantity. We also show that the periodic boundary conditions play a nontrivial role in molecular dynamics simulations, effectively masking the long-range nature of viscosity.

Levashov, Valentin A [ORNL; Morris, James R [ORNL; Egami, Takeshi [ORNL

2011-01-01T23:59:59.000Z

54

Measurement of shear wave velocity of heavy oil De-hua Han, Jiajin Liu, University of Houston  

E-Print Network (OSTI)

for measurement of fluid velocity is to measure the travel time of the transmission wave and then the velocity can water, has been used and is good for P-wave measurement for a lot of fluid samples. But the transmission the principle of this method. The shear wave transducer is coupled with a buffer made of some kind of plastic

55

Upper-mantle anisotropy beneath the Cameroon Volcanic Line and Congo Craton from shear wave splitting measurements  

Science Journals Connector (OSTI)

......material from a large rising thermal anomaly beneath southern Ethiopia...Central Africa from Angola to Sudan. In the Archaean, the Gabon-Cameroon...attributed to convection driven by thermal gradients between the asthenosphere...upper-mantle LPO due to the thermal gradient at the edge of the......

Franklin W. Koch; Douglas A. Wiens; Andrew A. Nyblade; Patrick J. Shore; Rigobert Tibi; B. Ateba; C.T. Tabod; J. M. Nnange

2012-07-01T23:59:59.000Z

56

Upper mantle anisotropy at the transition zone of the Saxothuringicum and Moldanubicum in southeast Germany revealed by shear wave splitting  

Science Journals Connector (OSTI)

......Saxothuringicum and Moldanubicum near the KTB borehole (German Continental Deep Drilling Program). With a mean station spacing of about...130 from the stations of the field experiment. Large black rhombs show those events that were used......

Thomas Plenefisch; Klaus Klinge; Rainer Kind

2001-02-01T23:59:59.000Z

57

Shear-wave splitting, lithospheric anisotropy, and mantle deformation beneath the ArabiaEurasia collision zone in Iran  

E-Print Network (OSTI)

­Eurasia collision zone in Iran Ayoub Kaviani a,b,c , Denis Hatzfeld c, , Anne Paul c , Mohammad Tatar b , Keith Priestley d a Institute for Advanced Studies in Basic Sciences, P.O. Box 45195-1159, Zanjan, Iran b International Institute of Earthquake Engineering and Seismology, P.O. Box 19395-3913, Tehran, Iran c

Hatzfeld, Denis

58

Characterization of subsurface fracture patterns in the Coso geothermal  

Open Energy Info (EERE)

subsurface fracture patterns in the Coso geothermal subsurface fracture patterns in the Coso geothermal reservoir by analyzing shear-wave splitting of microearthquake seismorgrams Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Conference Proceedings: Characterization of subsurface fracture patterns in the Coso geothermal reservoir by analyzing shear-wave splitting of microearthquake seismorgrams Details Activities (1) Areas (1) Regions (0) Abstract: A large number of microearthquake seismograms have been recorded by a downhole, three-component seismic network deployed around the Coso, California geothermal reservoir. Shear-wave splitting induced by the alignment of cracks in the reservoir has been widely observed in the recordings. Over 100 events with body wave magnitude greater than 1.0 from

59

Micro-Earthquake At Geysers Area (Malin, Et Al., 2004) | Open...  

Open Energy Info (EERE)

M. Simiyu, Anastasia Stroujkova, Windy McCausland (2004) A Comprehensive Study Of Fracture Patterns And Densities In The Geysers Geothermal Reservoir Using Microearthquake...

60

Non-double-couple microearthquakes at Long Valley caldera, California, provide evidence for hydraulic fracturing  

E-Print Network (OSTI)

Non-double-couple microearthquakes at Long Valley caldera, California, provide evidence.1) microearthquakes at Long Valley caldera in mid-1997, analyzed using data from a dense temporary network of 69 earthquakes; Long Valley caldera; seismic moment tensors; swarms; seismic sources 1. Introduction The ¢rst

Foulger, G. R.

Note: This page contains sample records for the topic "microearthquake shear-wave splitting" 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

Compressional and shear wave properties of marine sediments: Comparisons between theory and data  

Science Journals Connector (OSTI)

According to a recently developed theory of wave propagation in marine sediments the dispersion relationships for the phase speed and attenuation of the compressional and the shear wave depend on only three macroscopic physical variables: porosity grain size and depth in the sediment. The dispersion relations also involve three (real) parameters assigned fixed values representing microscopic processes occurring at grain contacts. The dispersion relationships are compared with extensive data sets taken from the literature covering the four waveproperties as functions of all three physical variables. With no adjustable parameters available the theory matches accurately the trends of all the data sets. This agreement extends to the compressional and shear attenuations in that the theory accurately traces out the lower bound to the widely distributed measuredattenuations: the theory predicts the intrinsicattenuation arising from the irreversible conversion of wave energy into heat whereas the measurements return the effectiveattenuation which includes the intrinsic attenuation plus additional sources of loss such as scattering from shell fragments and other inhomogeneities in the medium. Provided one wave or physical property is known say the compressional speed or the porosity all the remaining sediment properties may be reliably estimated from the theory.

Michael J. Buckingham

2005-01-01T23:59:59.000Z

62

High-resolution shear-wave reflection profiling to image offset in unconsolidated near-surface sediments  

E-Print Network (OSTI)

High-resolution shear-wave reflection profiling to image offset in unconsolidated near-surface sediments By Copyright 2014 Bevin L. Bailey Submitted to the Department of Geology and the Graduate Faculty of the University of Kansas... offset in unconsolidated near-surface sediments ________________________________ Chairperson Richard D. Miller Date approved: April 4th, 2014 iii Abstract S-wave reflection profiling has many theoretical...

Bailey, Bevin

2014-05-31T23:59:59.000Z

63

Modeling fault-zone guided waves of microearthquakes in a geothermal  

Open Energy Info (EERE)

fault-zone guided waves of microearthquakes in a geothermal fault-zone guided waves of microearthquakes in a geothermal reservoir Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Journal Article: Modeling fault-zone guided waves of microearthquakes in a geothermal reservoir Details Activities (1) Areas (1) Regions (0) Abstract: Fault-zone guided waves have been identified in microearthquake seismograms recorded at the Coso Geothermal Field, California. The observed guided waves have particle motions and propagation group velocities similar to Rayleigh wave modes. A numerical method has been employed to simulate the guided-wave propagation through the fault zone. By comparing observed and synthetic waveforms the fault-zone width and its P- and S-wave velocity structure have been estimated. It is suggested here that the identification

64

Micro-Earthquake At Kilauea East Rift Area (Thomas, 1986) | Open Energy  

Open Energy Info (EERE)

Micro-Earthquake At Kilauea East Rift Area (Thomas, Micro-Earthquake At Kilauea East Rift Area (Thomas, 1986) Exploration Activity Details Location Kilauea East Rift Area Exploration Technique Micro-Earthquake Activity Date Usefulness not indicated DOE-funding Unknown Notes Microseismic and ground noise studies were performed along the East Rift Zone in an effort to identify areas in which earthquake activity might suggest rock fracturing as a result of cold water coming into contact with heated reservoir rocks (Furumoto, 1978a). One of the microseismic surveys utilized an array of seven seismometers to monitor earthquake activity in the vicinity of the then proposed site of the HGP-A well (Fig. 53) (Suyenaga and Furumoto, 1978). The second microearthquake study utilized only two seismometers located near the junction of the Pahoa-Kalapana and

65

Moment-tensor statistics of the 1997 Long Valley microearthquake swarm  

Science Journals Connector (OSTI)

Abstract. A simple, fast, moment-tensor inversion method using bandpass-filtered P-amplitudes was used to study the moment-tensor statistics of Long Valley caldera microearthquakes. The events were recorded in...

A. Stroujkova; P.E. Malin

2002-01-01T23:59:59.000Z

66

Interest in using microearthquakes for characterizing petro-leum and geothermal reservoirs and the region surround-  

E-Print Network (OSTI)

Interest in using microearthquakes for characterizing petro- leum and geothermal reservoirs can be obtained from well logs, but they only provide direct information about conditions near the well. Microseismic (MS) monitoring techniques can be pri- mary methods for obtaining detailed

67

Micro-Earthquake At Geysers Geothermal Area (2011) | Open Energy  

Open Energy Info (EERE)

Geothermal Area (2011) Geothermal Area (2011) Exploration Activity Details Location Geysers Geothermal Area Exploration Technique Micro-Earthquake Activity Date 2011 Usefulness not indicated DOE-funding Unknown Exploration Basis Determine seismicity before and after reservoir stimulation for EGS Notes The overall goal is to gather high resolution seismicity data before, during and after stimulation activities at the EGS projects. This will include both surface and borehole deployments (as necessary in available boreholes) to provide high quality seismic data for improved processing and interpretation methodologies. This will allow the development and testing of seismic methods for understanding the performance of the EGS systems, as well as aid in developing induced seismicity mitigation techniques that can

68

Micro-Earthquake (Majer, 2003) | Open Energy Information  

Open Energy Info (EERE)

(Majer, 2003) (Majer, 2003) Exploration Activity Details Location Unspecified Exploration Technique Micro-Earthquake Activity Date Usefulness not indicated DOE-funding Unknown Notes The goal of this work is to evaluate the most promising methods and approaches that may be used for improved geothermal exploration and reservoir assessment. It is not a comprehensive review of all seismic methods used to date in geothermal environments. This work was motivated by a need to assess current and developing seismic technology that if applied in geothermal cases may greatly improve the chances for locating new geothermal resources and/or improve assessment of current ones. References E. L. Majer (2003) 3-D Seismic Methods For Geothermal Reservoir Exploration And Assessment-Summary

69

Micro-Earthquake At Raft River Geothermal Area (2011) | Open Energy  

Open Energy Info (EERE)

Micro-Earthquake At Raft River Geothermal Area (2011) Micro-Earthquake At Raft River Geothermal Area (2011) Exploration Activity Details Location Raft River Geothermal Area Exploration Technique Micro-Earthquake Activity Date 2011 Usefulness not indicated DOE-funding Unknown Exploration Basis Determine seismicity before and after reservoir stimulation for EGS Notes The overall goal is to gather high resolution seismicity data before, during and after stimulation activities at the EGS projects. This will include both surface and borehole deployments to provide high quality seismic data for improved processing and interpretation methodologies. This will allow the development and testing of seismic methods for understanding the performance of the EGS systems, as well as aid in developing induced seismicity mitigation techniques that can be used for a variety of EGS

70

Micro-Earthquake At Coso Geothermal Area (2007) | Open Energy Information  

Open Energy Info (EERE)

Coso Geothermal Area (2007) Coso Geothermal Area (2007) Exploration Activity Details Location Coso Geothermal Area Exploration Technique Micro-Earthquake Activity Date 2007 Usefulness not indicated DOE-funding Unknown Exploration Basis Develop and test a tool to better analyze microearthquake data Notes A GUI-based interface was developed to use inversion software that greatly increases its ease of use and makes feasible analyzing larger numbers of earthquakes than previously was practical. Examples are shown from an injection experiment conducted in well 34-9RD2, on the East Flank. This tight well was re-drilled February - March 2005. Pervasive porosity and fractures were encountered at about 2660 m depth. These mud losses induced a 50-minute swarm of 44 microearthquakes, with magnitudes in the range -0.3

71

Micro-Earthquake At Coso Geothermal Area (1993-1994) | Open Energy  

Open Energy Info (EERE)

1994) 1994) Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Exploration Activity: Micro-Earthquake At Coso Geothermal Area (1993-1994) Exploration Activity Details Location Coso Geothermal Area Exploration Technique Micro-Earthquake Activity Date 1993 - 1994 Usefulness useful DOE-funding Unknown Exploration Basis Multiplet analysis Notes Instances of microseismicity in seismic doublets which are co-located hypocenters that appear to have nearly identical waveforms were searched for. Using 1085 high-quality events from 1993 to 1994, they identified numerous doublets, some occurring within minutes of each other. The hypocentral data was subdivided into spatial clusters to reduce the computational burden and evaluated multiple cross-correlation pairs,

72

Micro-Earthquake At Raft River Geothermal Area (1979) | Open Energy  

Open Energy Info (EERE)

9) 9) Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Exploration Activity: Micro-Earthquake At Raft River Geothermal Area (1979) Exploration Activity Details Location Raft River Geothermal Area Exploration Technique Micro-Earthquake Activity Date 1979 Usefulness not indicated DOE-funding Unknown Exploration Basis Refraction Survey Notes Interpretation of seismic refraction recordings in the area yielded compressional velocities from near the surface to the crystalline basement at a maximum depth of approximately 1600 m. The results show a complex sequence of sediments and volcanic flows overlying basement. Velocities in the sedimentary section vary laterally. Correlation with well data suggests that zones of higher velocities may correspond to zones where sediments are

73

Micro-Earthquake At Raft River Geothermal Area (1982) | Open Energy  

Open Energy Info (EERE)

) ) Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Exploration Activity: Micro-Earthquake At Raft River Geothermal Area (1982) Exploration Activity Details Location Raft River Geothermal Area Exploration Technique Micro-Earthquake Activity Date 1982 Usefulness not indicated DOE-funding Unknown Exploration Basis Develop a background seismicity before power production begins Notes Local seismic networks were established to monitor the background seismicity prior to initiation of geothermal power production. The Raft River study area is currently seismically quiet down to the level of approximately magnitude one. References Zandt, G.; Mcpherson, L.; Schaff, S.; Olsen, S. (1 May 1982) Seismic baseline and induction studies- Roosevelt Hot Springs, Utah and

74

Micro-Earthquake At Newberry Caldera Geothermal Area (2011) | Open Energy  

Open Energy Info (EERE)

Area (2011) Area (2011) Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Exploration Activity: Micro-Earthquake At Newberry Caldera Geothermal Area (2011) Exploration Activity Details Location Newberry Caldera Geothermal Area Exploration Technique Micro-Earthquake Activity Date 2011 Usefulness not indicated DOE-funding Unknown Exploration Basis Determine seismicity before and after reservoir stimulation for EGS Notes The overall goal is to gather high resolution seismicity data before, during and after stimulation activities at the EGS projects. This will include both surface and borehole deployments (as necessary in available boreholes) to provide high quality seismic data for improved processing and interpretation methodologies. This will allow the development and testing

75

Microearthquake surveys of Snake River plain and Northwest Basin and Range  

Open Energy Info (EERE)

surveys of Snake River plain and Northwest Basin and Range surveys of Snake River plain and Northwest Basin and Range geothermal areas Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Journal Article: Microearthquake surveys of Snake River plain and Northwest Basin and Range geothermal areas Details Activities (2) Areas (2) Regions (0) Abstract: applications; Basin and Range Province; Black Rock Desert; Cassia County Idaho; earthquakes; economic geology; exploration; fracture zones; geophysical methods; geophysical surveys; geothermal energy; Humboldt County Nevada; Idaho; microearthquakes; Nevada; North America; passive systems; Pershing County Nevada; Raft River; reservoir rocks; seismic methods; seismicity; seismology; Snake River plain; surveys; United States; Western U.S. Author(s): Kumamoto, L.H.

76

Analysis of microearthquake data at Cold Lake and its applications to reservoir monitoring  

E-Print Network (OSTI)

-difference method, which highlights several tight event clusters. The deep cluster at a depth of 400 m, just above the oil reservoir, shows very high seismicity during the CSS processes.Asec- ond cluster is observed of the region. We analyzed a microearthquake data set from Cold Lake,Alberta, where heavy oil is extracted using

Snieder, Roel

77

Induced Microearthquake Patterns in Hydrocarbon and Geothermal Reservoirs: W. Scott Phillips  

E-Print Network (OSTI)

Induced Microearthquake Patterns in Hydrocarbon and Geothermal Reservoirs: A Review W. Scott or production of fluids can induce microseismic events in hydrocarbon and geothermal reservoirs. By deploying sensors downhole, data sets have been collected that consist of a few hundred to well over 10,000 induced

78

Micro-Earthquake At Coso Geothermal Area (1987) | Open Energy Information  

Open Energy Info (EERE)

Jump to: navigation, search Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Exploration Activity: Micro-Earthquake At Coso Geothermal Area (1987) Exploration Activity Details Location Coso Geothermal Area Exploration Technique Micro-Earthquake Activity Date 1987 Usefulness not indicated DOE-funding Unknown Exploration Basis Analysis was done to link the zones of decreased P velocity to contemporary magmatic activity Notes Inversion of 4036 P wave travel time residuals from 429 local earthquakes using a tomographic scheme provides information about 3D upper crustal velocity variations in the Indian Wells Valley-Coso region of southeastern CA. The residuals are calculated relative to a Coso-specific velocity model, corrected for station elevation, weighted, and back-projected along

79

Micro-Earthquake At New York Canyon Geothermal Area (2011) | Open Energy  

Open Energy Info (EERE)

York Canyon Geothermal Area (2011) York Canyon Geothermal Area (2011) Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Exploration Activity: Micro-Earthquake At New York Canyon Geothermal Area (2011) Exploration Activity Details Location New York Canyon Geothermal Area Exploration Technique Micro-Earthquake Activity Date 2011 Usefulness not indicated DOE-funding Unknown Exploration Basis Determine seismicity before and after reservoir stimulation for EGS Notes The overall goal is to gather high resolution seismicity data before, during and after stimulation activities at the EGS projects. This will include both surface and borehole deployments (as necessary in available boreholes) to provide high quality seismic data for improved processing and interpretation methodologies. This will allow the development and testing

80

Micro-Earthquake At Coso Geothermal Area (1996) | Open Energy Information  

Open Energy Info (EERE)

) ) Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Exploration Activity: Micro-Earthquake At Coso Geothermal Area (1996) Exploration Activity Details Location Coso Geothermal Area Exploration Technique Micro-Earthquake Activity Date 1996 Usefulness useful DOE-funding Unknown Exploration Basis Determine the attenuation structure Notes Pulse width data are used to invert for attenuation structure. The dataset consists of pulse width measurements of 838 microseismic events recorded on a seismic array of 16 downhole stations between August 1993 and March 1994. A broad region of low Q (≈ 30 to 37) is located at 0.5 to 1.2 km in depth below Devil's Kitchen, Nicol Prospects, and Coso Hot Springs. A vertical, low Q (≈ 36 in contrast with surrounding rock of 80) region is

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


81

Micro-Earthquake At Long Valley Caldera Area (Stroujkova & Malin, 2001) |  

Open Energy Info (EERE)

Long Valley Caldera Area (Stroujkova & Malin, 2001) Long Valley Caldera Area (Stroujkova & Malin, 2001) Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Exploration Activity: Micro-Earthquake At Long Valley Caldera Area (Stroujkova & Malin, 2001) Exploration Activity Details Location Long Valley Caldera Area Exploration Technique Micro-Earthquake Activity Date Usefulness not indicated DOE-funding Unknown Notes Our preferred model for the unusual events is that of multiple ordinary earthquakes being triggered or forced by a fluid injection into a thin volcanic conduit. An example of such a structure would be a dike connected to one or more shear or wing fractures. In this model, resonant increases in pressure in the conduit would cause the shear fractures to fail seismically at fixed time delays. For the time delays seen at Long Valley,

82

Micro-Earthquake At Under Steamboat Springs Area (Warpinski, Et Al., 2002)  

Open Energy Info (EERE)

Under Steamboat Springs Area (Warpinski, Et Al., 2002) Under Steamboat Springs Area (Warpinski, Et Al., 2002) Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Exploration Activity: Micro-Earthquake At Under Steamboat Springs Area (Warpinski, Et Al., 2002) Exploration Activity Details Location Under Steamboat Springs Area Exploration Technique Micro-Earthquake Activity Date Usefulness useful DOE-funding Unknown Notes This project consisted of (1) a 3-D surface seismic survey conducted in the fall of 2000, (2) a micro-seismic survey run from November 2000 to April 200 1, and (3) a gravity survey conducted in April and May 2001. The 3-D surface seismic data are still being processed at this time, but initial results indicate that there are two major lineations of high velocity running orthogonal to each other which are presumably related to the fault

83

Micro-Earthquake At Coso Geothermal Area (2000) | Open Energy Information  

Open Energy Info (EERE)

0) 0) Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Exploration Activity: Micro-Earthquake At Coso Geothermal Area (2000) Exploration Activity Details Location Coso Geothermal Area Exploration Technique Micro-Earthquake Activity Date 2000 Usefulness not indicated DOE-funding Unknown Exploration Basis Compare results of dense arrays with less densely spaced instruments Notes Results from a dense array of passive seismometers are presented. Data collected during the 18-month deployment of 16 dense mini-arrays in the region of the China Lake geothermal field near Ridgecrest, CA was used. The crustal structure within the geothermal field, its relationship to regional tectonic features, and search for an indication of mantle influence on volcanism was imaged. The mini-arrays consist of mostly short period

84

Micro-Earthquake At Coso Geothermal Area (1974) | Open Energy Information  

Open Energy Info (EERE)

Coso Geothermal Area (1974) Coso Geothermal Area (1974) Exploration Activity Details Location Coso Geothermal Area Exploration Technique Micro-Earthquake Activity Date 1974 Usefulness useful DOE-funding Unknown Exploration Basis To determine the background level of seismicity before any drilling related to production takes place. Notes Two different arrays of portable high-gain seismographs were installed- measurements taken over thirty three days; completed 9 calibration blasts. The microearthquake activity changed considerably including days which had only a few events while others had as many as 100 or more distinct local events; more than two thousand events with S-P times of less than three seconds were detected; observed low value for Poisson's ratio which indicated that the Coso geothermal system is a vapor-dominated system

85

Micro-Earthquake At Roosevelt Hot Springs Geothermal Area (1982) | Open  

Open Energy Info (EERE)

Geothermal Area (1982) Geothermal Area (1982) Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Exploration Activity: Micro-Earthquake At Roosevelt Hot Springs Geothermal Area (1982) Exploration Activity Details Location Roosevelt Hot Springs Geothermal Area Exploration Technique Micro-Earthquake Activity Date 1982 Usefulness not indicated DOE-funding Unknown Exploration Basis Develop a background seismicity before power production begins Notes Local seismic networks were established to monitor the background seismicity prior to initiation of geothermal power production. The Raft River study area is currently seismically quiet down to the level of approximately magnitude one. References Zandt, G.; Mcpherson, L.; Schaff, S.; Olsen, S. (1 May 1982) Seismic baseline and induction studies- Roosevelt Hot Springs, Utah and

86

Microearthquake Study of the Salton Sea Geothermal Field, California: Evidence of Stress Triggering - Masters Thesis  

SciTech Connect

A digital network of 24 seismograph stations was operated from September 15, 1987 to September 30, 1988, by Lawrence Livermore National Laboratory and Unocal as part of the Salton Sea Scientific Drilling Project to study seismicity related to tectonics and geothermal activity near the drilling site. More than 2001 microearthquakes were relocated in this study in order to image any pervasive structures that may exist within the Salton Sea geothermal field. First, detailed velocity models were obtained through standard 1-D inversion techniques. These velocity models were then used to relocate events using both single event methods and Double-Differencing, a joint hypocenter location method. An anisotropic velocity model was built from anisotropy estimates obtained from well logs within the study area. During the study period, the Superstition wills sequence occurred with two moderate earthquakes of MS 6.2 and MS 6.6. These moderate earthquakes caused a rotation of the stress field as observed from the inversion of first motion data from microearthquakes at the Salton Sea geothermal field. Coulomb failure analysis also indicates that microearthquakes occurring after the Superstition Hills sequence are located within a region of stress increase suggesting stress triggering caused by the moderate earthquakes.

Holland, Austin Adams

2002-02-01T23:59:59.000Z

87

Characterization Of Fracture Patterns In The Geysers Geothermal Reservoir  

Open Energy Info (EERE)

Patterns In The Geysers Geothermal Reservoir Patterns In The Geysers Geothermal Reservoir By Shear-Wave Splitting Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Report: Characterization Of Fracture Patterns In The Geysers Geothermal Reservoir By Shear-Wave Splitting Details Activities (1) Areas (1) Regions (0) Abstract: The authors have analyzed the splitting of shear waves from microearthquakes recorded by a 16-station three-component seismic network at the Northwest Geysers geothermal field, Geysers, California, to determine the preferred orientation of subsurface fractures and cracks. Average polarization crack directions with standard deviation were computed for each station. Also, graphical fracture characterizations in the form of equal-area projections and rose diagrams were created to depict the

88

TEMPORAL VARIATIONS OF FRACTURE DIRECTIONS AND FRACTURE DENSITIES IN THE  

Open Energy Info (EERE)

TEMPORAL VARIATIONS OF FRACTURE DIRECTIONS AND FRACTURE DENSITIES IN THE TEMPORAL VARIATIONS OF FRACTURE DIRECTIONS AND FRACTURE DENSITIES IN THE COSO GEOTHERMAL FIELD FROM ANALYSES OF SHEAR-WAVE SPLITTING Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Conference Proceedings: TEMPORAL VARIATIONS OF FRACTURE DIRECTIONS AND FRACTURE DENSITIES IN THE COSO GEOTHERMAL FIELD FROM ANALYSES OF SHEAR-WAVE SPLITTING Details Activities (1) Areas (1) Regions (0) Abstract: This project aims to improve understanding of the subsurface fracture system in the Coso geothermal field, located in the east central California. We applied shear-wave splitting technique on a set of high quality, locally recorded microearthquake (MEQ) data. Four major fracture directions have been identified from the seismograms recorded by the permanent sixteen-station down-hole array: N10- 20W, NS, N20E, and N40-45E,

89

A Comprehensive Study Of Fracture Patterns And Densities In The Geysers  

Open Energy Info (EERE)

Study Of Fracture Patterns And Densities In The Geysers Study Of Fracture Patterns And Densities In The Geysers Geothermal Reservoir Using Microearthquake Shear-Wave Splitting Tomography Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Report: A Comprehensive Study Of Fracture Patterns And Densities In The Geysers Geothermal Reservoir Using Microearthquake Shear-Wave Splitting Tomography Details Activities (1) Areas (1) Regions (0) Abstract: In this project we developed a method for using seismic S-wave data to map the patterns and densities of sub-surface fractures in the NW Geysers Geothermal Field/ (1) This project adds to both the general methods needed to characterize the geothermal production fractures that supply steam for power generation and to the specific knowledge of these in the Geysers area. (2)By locating zones of high fracture density it will be

90

Micro-Earthquake At Desert Peak Geothermal Area (2011) | Open Energy  

Open Energy Info (EERE)

Desert Peak Geothermal Area Desert Peak Geothermal Area (2011) Exploration Activity Details Location Desert Peak Geothermal Area Exploration Technique Micro-Earthquake Activity Date 2011 Usefulness not indicated DOE-funding Unknown Exploration Basis Determine seismicity before and after reservoir stimulation for EGS Notes The overall goal is to gather high resolution seismicity data before, during and after stimulation activities at the EGS projects. This will include both surface and borehole deployments (as necessary in available boreholes) to provide high quality seismic data for improved processing and interpretation methodologies. This will allow the development and testing of seismic methods for understanding the performance of the EGS systems, as well as aid in developing induced seismicity mitigation techniques that can

91

Micro-Earthquake At Brady Hot Springs Geothermal Area (2011) | Open Energy  

Open Energy Info (EERE)

Geothermal Area Geothermal Area (2011) Exploration Activity Details Location Brady Hot Springs Geothermal Area Exploration Technique Micro-Earthquake Activity Date 2011 Usefulness not indicated DOE-funding Unknown Exploration Basis Determine seismicity before and after reservoir stimulation for EGS Notes The overall goal is to gather high resolution seismicity data before, during and after stimulation activities at the EGS projects. This will include both surface and borehole deployments (as necessary in available boreholes) to provide high quality seismic data for improved processing and interpretation methodologies. This will allow the development and testing of seismic methods for understanding the performance of the EGS systems, as well as aid in developing induced seismicity mitigation techniques that can

92

Micro-Earthquake At Under Steamboat Springs Area (Warpinski, Et Al., 2004)  

Open Energy Info (EERE)

Under Steamboat Springs Area Under Steamboat Springs Area (Warpinski, Et Al., 2004) Exploration Activity Details Location Under Steamboat Springs Area Exploration Technique Micro-Earthquake Activity Date Usefulness useful DOE-funding Unknown Notes Update to Warpinski, et al., 2002 References N. R. Warpinski, A. R. Sattler, R. Fortuna, D. A. Sanchez, J. Nathwani (2004) Geothermal Resource Exploration And Definition Projects Retrieved from "http://en.openei.org/w/index.php?title=Micro-Earthquake_At_Under_Steamboat_Springs_Area_(Warpinski,_Et_Al.,_2004)&oldid=386654" Categories: Exploration Activities DOE Funded Activities What links here Related changes Special pages Printable version Permanent link Browse properties About us Disclaimers Energy blogs Linked Data Developer services OpenEI partners with a broad range of international organizations to grow

93

Julian, B.R. and G.R. Foulger, Monitoring Geothermal Processes with Microearthquake Mechanisms, Thirty-Fourth Workshop on Geothermal Reservoir Engineering, Stanford University, Stanford, California, February 9-  

E-Print Network (OSTI)

Julian, B.R. and G.R. Foulger, Monitoring Geothermal Processes with Microearthquake Mechanisms, Thirty- Fourth Workshop on Geothermal Reservoir Engineering, Stanford University, Stanford, California, February 9- 11, 2009. Monitoring Geothermal Processes with Microearthquake Mechanisms Bruce R. Julian, U. S

Foulger, G. R.

94

Julian, B.R. and G.R. Foulger, Improved Methods for Mapping Permeability and Heat sources in Geothermal Areas using Microearthquake Data, Thirty-Fifth Workshop on Geothermal Reservoir Engineering, Stanford University,  

E-Print Network (OSTI)

Systems (EGS) experiments and other geothermal operations. With support from the Dept. of Energy, we in Geothermal Areas using Microearthquake Data, Thirty-Fifth Workshop on Geothermal Reservoir Engineering and Heat sources in Geothermal Areas using Microearthquake Data Bruce R. Julian§ U. S. Geological Survey

Foulger, G. R.

95

Split University | Open Energy Information  

Open Energy Info (EERE)

Croatia-based electrical engineering faculty of Split University. Involved in developing small hydro and solar energy projects. References: Split University1 This article is a...

96

Compressional and shear-wave velocities from gas hydrate bearing sediments: Examples from the India and Cascadia margins as well as Arctic permafrost regions  

Science Journals Connector (OSTI)

Abstract Shear wave velocity data have been acquired at several marine gas hydrate drilling expeditions, including the India National Gas Hydrate Program Expedition 1 (NGHP-01), the Ocean Drilling Program (ODP) Leg 204, and Integrated Ocean Drilling Program (IODP) Expedition 311 (X311). In this study we use data from these marine drilling expeditions to develop an understanding of general grain-size control on the P- and S-wave properties of sediments. A clear difference in the downhole trends of P-wave (Vp) and S-wave (Vs) velocity and the Vp/Vs ratio from all three marine regions was observed: the northern Cascadia margin (IODP X311) shows the highest P-wave and S-wave velocity values overall and those from the India margin (Expedition NGHP-01) are the lowest. The southern Cascadia margin (ODP Leg 204) appears to have similar low P-wave and S-wave velocity values as seen off India. S-wave velocity values increase relative to the sites off India, but they are not as high as those seen on the northern Cascadia margin. Such regional differences can be explained by the amount of silt/sand (or lack thereof) occurring at these sites, with northern Cascadia being the region of the highest silt/sand occurrences. This grain-size control on P-wave and S-wave velocity and associated mineral composition differences is amplified when compared to the Arctic permafrost environments, where gas hydrate predominantly occurs in sand- and silt-dominated formations. Using a cross-plot of gamma ray values versus the Vp/Vs ratio, we compare the marine gas hydrate occurrences in these regions: offshore eastern India margin, offshore Cascadia margin, the Ignik-Sikumi site in Alaska, and the Mallik 5L-38 site in the Mackenzie Delta. The log-data from the Arctic permafrost regions show a strongly linear Vp–Vs relationship, similar to the previously defined empirical relationships by Greenberg and Castagna (1992). P- and S-wave velocity data from the India margin and ODP Leg 204 deviate strongly from these linear trends, whereas data from IODP X311 plot closer to the trend of the Arctic data sets and previously published relationships. Three new linear relationships for different grain size marine sediment hosts are suggested:a) mud-dominated (Mahanadi Basin, ODP Leg 204 & NGHP-01-17): Vs = 1.5854 × Vp ? 2.1649 b) silty-mud (KG Basin): Vs = 0.8105 × Vp ? 1.0223 c) silty-sand (IODP X311): Vs = 0.5316 × Vp ? 0.4916 We investigate the relationship of gas hydrate saturation determined from electrical resistivity on the Vp/Vs ratio and found that the sand-dominated Arctic hosts show a clearly decreasing trend of Vp/Vs ratio with gas hydrate saturation. Though limited due to lower overall GH saturations, a similar trend is seen for sites from IODP X311 and at the ash-dominated NGHP-01-17 sediment in the Andaman Sea. Gas hydrate that occurs predominantly in fractured clay hosts show a different trend where the Vp/Vs ratio is much higher than at sand-dominated sites and remains constant or increases slightly with increasing gas hydrate saturation. This trend may be the result of anisotropy in fracture-dominated systems, where P- and S-wave velocities appear higher and Archie-based saturations of gas hydrate are overestimated. Gas hydrate concentrations were also estimated in these three marine settings and at Arctic sites using an effective medium model, combining P- and S-wave velocities as equally weighted constraints on the calculation. The effective medium approach generally overestimates S-wave velocity in high-porosity, clay-dominated sediments, but can be accurately used in sand-rich formations.

M. Riedel; D. Goldberg; G. Guerin

2014-01-01T23:59:59.000Z

97

Photobiological Water Splitting  

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

In this process, hydrogen is produced from water using sunlight and specialized microorganisms, such as green algae and cyanobacteria. Just as plants produce oxygen during photosynthesis, these microorganisms consume water and produce hydrogen as a byproduct of their natural metabolic processes. Photobiological water splitting is a long-term technology. Currently, the microbes split water much too slowly to be used for efficient, commercial hydrogen production. But scientists are researching ways to modify the microorganisms and to identify other naturally occurring microbes that can produce hydrogen at higher rates. Photobiological water splitting is in the very early stages of research but offers long-term potential for sustainable hydrogen production with low environmental impact.

98

Split image optical display  

DOE Patents (OSTI)

A video image is displayed from an optical panel by splitting the image into a plurality of image components, and then projecting the image components through corresponding portions of the panel to collectively form the image. Depth of the display is correspondingly reduced.

Veligdan, James T. (Manorville, NY)

2007-05-29T23:59:59.000Z

99

High-Temperature Water Splitting  

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

High-temperature water splitting (a "thermochemical" process) is a long-term technology in the early stages of development.

100

Thermally induced photon splitting  

E-Print Network (OSTI)

We calculate thermal corrections to the non-linear QED effective action for low-energy photon interactions in a background electromagnetic field. The high-temperature expansion shows that at $T \\gg m$ the vacuum contribution is exactly cancelled to all orders in the external field except for a non-trivial two-point function contribution. The high-temperature expansion derived reveals a remarkable cancellation of infrared sensitive contributions. As a result photon-splitting in the presence of a magnetic field is suppressed in the presence of an electron-positron QED-plasma at very high temperatures. In a cold and dense plasma a similar suppression takes place. At the same time Compton scattering dominates for weak fields and the suppression is rarely important in physical situations.

Per Elmfors; Bo-Sture Skagerstam

1998-02-23T23:59:59.000Z

Note: This page contains sample records for the topic "microearthquake shear-wave splitting" from the National Library of EnergyBeta (NLEBeta).
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101

Split-ball resonator  

E-Print Network (OSTI)

We introduce a new concept of split-ball resonator and demonstrate a strong omnidirectional magnetic dipole response for both gold and silver spherical plasmonic nanoparticles with nanometer-scale cuts. Tunability of the magnetic dipole resonance throughout the visible spectral range is demonstrated by a change of the depth and width of the nanoscale cut. We realize this novel concept experimentally by employing the laser-induced transfer method to produce near-perfect spheres and helium ion beam milling to make cuts with the nanometer resolution. Due to high quality of the spherical particle shape, governed by strong surface tension forces during the laser transfer process, and the clean, straight side walls of the cut made by helium ion milling, magnetic resonance is observed at 600 nm in gold and at 565 nm in silver nanoparticles. Structuring arbitrary features on the surface of ideal spherical resonators with nanoscale dimensions provides new ways of engineering hybrid resonant modes and ultra-high near-f...

Kuznetsov, Arseniy I; Fu, Yuan Hsing; Viswanathan, Vignesh; Rahmani, Mohsen; Valuckas, Vytautas; Kivshar, Yuri; Pickard, Daniel S; Lukiyanchuk, Boris

2014-01-01T23:59:59.000Z

102

Split-illumination electron holography  

SciTech Connect

We developed a split-illumination electron holography that uses an electron biprism in the illuminating system and two biprisms (applicable to one biprism) in the imaging system, enabling holographic interference micrographs of regions far from the sample edge to be obtained. Using a condenser biprism, we split an electron wave into two coherent electron waves: one wave is to illuminate an observation area far from the sample edge in the sample plane and the other wave to pass through a vacuum space outside the sample. The split-illumination holography has the potential to greatly expand the breadth of applications of electron holography.

Tanigaki, Toshiaki; Aizawa, Shinji; Suzuki, Takahiro; Park, Hyun Soon [Advanced Science Institute, RIKEN, Hirosawa 2-1, Wako, Saitama 351-0198 (Japan); Inada, Yoshikatsu [Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Katahira 2-1-1, Sendai 980-8577 (Japan); Matsuda, Tsuyoshi [Japan Science and Technology Agency, Kawaguchi, Saitama 332-0012 (Japan); Taniyama, Akira [Corporate Research and Development Laboratories, Sumitomo Metal Industries, Ltd., Amagasaki, Hyogo 660-0891 (Japan); Shindo, Daisuke [Advanced Science Institute, RIKEN, Hirosawa 2-1, Wako, Saitama 351-0198 (Japan); Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Katahira 2-1-1, Sendai 980-8577 (Japan); Tonomura, Akira [Advanced Science Institute, RIKEN, Hirosawa 2-1, Wako, Saitama 351-0198 (Japan); Okinawa Institute of Science and Technology, Graduate University, Onna-son, Okinawa 904-0495 (Japan); Central Research Laboratory, Hitachi, Ltd., Hatoyama, Saitama 350-0395 (Japan)

2012-07-23T23:59:59.000Z

103

Split ring containment attachment device  

DOE Patents (OSTI)

A containment attachment device 10 for operatively connecting a glovebag 200 to plastic sheeting 100 covering hazardous material. The device 10 includes an inner split ring member 20 connected on one end 22 to a middle ring member 30 wherein the free end 21 of the split ring member 20 is inserted through a slit 101 in the plastic sheeting 100 to captively engage a generally circular portion of the plastic sheeting 100. A collar potion 41 having an outer ring portion 42 is provided with fastening means 51 for securing the device 10 together wherein the glovebag 200 is operatively connected to the collar portion 41.

Sammel, Alfred G. (Pittsburgh, PA)

1996-01-01T23:59:59.000Z

104

The split algebras and noncompact Hopf maps  

SciTech Connect

We develop a noncompact version of the Hopf maps based on the split algebras. The split algebras consist of three species: split-complex numbers, split quaternions, and split octonions. They correspond to three noncompact Hopf maps that represent topological maps between hyperboloids in different dimensions with hyperboloid bundle. We realize such noncompact Hopf maps in two ways: one is to utilize the split-imaginary unit, and the other is to utilize the ordinary imaginary unit. Topological structures of the hyperboloid bundles are explored, and the canonical connections are naturally regarded as noncompact gauge field of monopoles.

Hasebe, Kazuki [Department of General Education, Kagawa National College of Technology, Takuma-cho, Mitoyo city, Kagawa 769-1192 (Japan)

2010-05-15T23:59:59.000Z

105

Split Rank of Triangle and Quadrilateral Inequalities  

E-Print Network (OSTI)

Jun 4, 2009 ... facet-defining inequalities for (1) have a finite split rank? We prove that the split rank of all the facet-defining inequalities of conv(P(R, f)) is finite ...

2009-06-04T23:59:59.000Z

106

Splitting and Confirming Large File  

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

Splitting and Confirming Large File Splitting and Confirming Large File Name: Bradley C. Status: Student Age: 16 Location: N/A Country: N/A Date: June 2003 Question: I just calculated one billion digits of pi on my PC, how do I confirm them? I cannot access them because the file size is 1.28 GB, my ram is only 512 MB, meaning none of my word processor's will touch it. Is it possible to split the document, somehow? Then how do I confirm the digits? Replies: Checking the correctness of large numbers -- transcendental numbers like 'pi', or a large prime -- is not easy because there are many sources of error that are difficult to detect, or track down. Some, but by no means all are: 1. How "good" (that is convergent) is the algorithm? If, for example the algorithm is some sort of infinite series, there is always a truncation error, because you cannot compute an infinite number of terms in a finite amount of time. The further out you go in the algorithm, the more significant these errors become.

107

Optimization Online - Splitting methods for nonconvex composite ...  

E-Print Network (OSTI)

Jul 2, 2014 ... Splitting methods for nonconvex composite optimization. Guoyin Li (g.li ***at*** unsw.edu.au) Ting Kei Pong (tkpong ***at*** cs.ubc.ca).

Guoyin Li

2014-07-02T23:59:59.000Z

108

Splitting the Cycle the Right Way  

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

The unique opposed-cylinder configuration of the TourEngine allows superior thermal management and efficient gas transfer compared to other split-cycle designs.

109

Time-Split versus Process-Split Coupling of Parameterizations and Dynamical Core  

Science Journals Connector (OSTI)

Simulations are compared to determine the effect of the details of the coupling of the parameterization suite with the dynamical core on the simulated climate. Simulations based on time-split and process-split couplings are compared to a ...

David L. Williamson

2002-08-01T23:59:59.000Z

110

SPLITTING (CP x CP) LOCALIZED AT 2  

Science Journals Connector (OSTI)

......Press September 1988 research-article Articles SPLITTING (CP CP ) LOCALIZED AT 2 PETER J. ECCLES WILLIAM P. R. MITCHELL...namely the splitting of the 2-localization of the space 2(CP" x CP") into a bouquet of spaces. This is a particularly......

PETER J. ECCLES; WILLIAM P. R. MITCHELL

1988-09-01T23:59:59.000Z

111

High Temperature Solar Splitting of Methane  

E-Print Network (OSTI)

-term commercialization opportunities #12;Why Use Solar Energy?Why Use Solar Energy? · High concentrations possible (>1000High Temperature Solar Splitting of Methane to Hydrogen and Carbon High Temperature Solar Splitting and worldwide) ­ Sufficient to power the world (if we choose to) · Advantages tradeoff against collection area

112

White Papers on Materials for Photoelectrochemical Water Splitting...  

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

White Papers on Materials for Photoelectrochemical Water Splitting White Papers on Materials for Photoelectrochemical Water Splitting Series of white papers from the U.S....

113

DOE's Gasoline/Diesel PM Split Study | Department of Energy  

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

GasolineDiesel PM Split Study DOE's GasolineDiesel PM Split Study 2005 Diesel Engine Emissions Reduction (DEER) Conference Presentations and Posters 2005deerfujita.pdf More...

114

Strong CP, Flavor, and Twisted Split Fermions  

E-Print Network (OSTI)

It can, however, couple to the CP breaking adjoint ?, forLBNL- 56615 Strong CP, Flavor, and Twisted Split Fermionshep-ph/0411132v2 10 Nov 2004 Strong CP, Flavor, and Twisted

Harnik, Roni

2009-01-01T23:59:59.000Z

115

Atom-split it for nuclear energy  

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

Atom-split it for nuclear energy Fermi-leader of the team that produced the first self-sustaining controlled nuclear chain reaction; contributed to ending WWII Calutron-invented by...

116

Structural basis of photosynthetic water-splitting  

SciTech Connect

Photosynthetic water-splitting takes place in photosystem II (PSII), a membrane protein complex consisting of 20 subunits with an overall molecular mass of 350 kDa. The light-induced water-splitting reaction catalyzed by PSII not only converts light energy into biologically useful chemical energy, but also provides us with oxygen indispensible for sustaining oxygenic life on the earth. We have solved the structure of PSII at a 1.9 Å resolution, from which, the detailed structure of the Mn{sub 4}CaO{sub 5}-cluster, the catalytic center for water-splitting, became clear. Based on the structure of PSII at the atomic resolution, possible mechanism of light-induced water-splitting was discussed.

Shen, Jian-Ren [Graduate School of Natural Science and Technology/Faculty of Science, Okayama University, Okayama (Japan); Umena, Yasufumi [The OCU Advanced Research Institute for Natural Science and Technology (OCARINA), Osaka City University, Osaka, Japan and PRESTO, JST (Japan); Kawakami, Keisuke [The OCU Advanced Research Institute for Natural Science and Technology (OCARINA), Osaka City University, Osaka (Japan); Kamiya, Nobuo [The OCU Advanced Research Institute for Natural Science and Technology (OCARINA), Osaka City University, Osaka, Japan and Department of Chemistry, Graduate School of Science, Osaka City University, Osaka (Japan)

2013-12-10T23:59:59.000Z

117

DETECTION OF FLUX EMERGENCE, SPLITTING, MERGING, AND CANCELLATION OF NETWORK FIELD. I. SPLITTING AND MERGING  

SciTech Connect

Frequencies of magnetic patch processes on the supergranule boundary, namely, flux emergence, splitting, merging, and cancellation, are investigated through automatic detection. We use a set of line-of-sight magnetograms taken by the Solar Optical Telescope (SOT) on board the Hinode satellite. We found 1636 positive patches and 1637 negative patches in the data set, whose time duration is 3.5 hr and field of view is 112'' Multiplication-Sign 112''. The total numbers of magnetic processes are as follows: 493 positive and 482 negative splittings, 536 positive and 535 negative mergings, 86 cancellations, and 3 emergences. The total numbers of emergence and cancellation are significantly smaller than those of splitting and merging. Further, the frequency dependence of the merging and splitting processes on the flux content are investigated. Merging has a weak dependence on the flux content with a power-law index of only 0.28. The timescale for splitting is found to be independent of the parent flux content before splitting, which corresponds to {approx}33 minutes. It is also found that patches split into any flux contents with the same probability. This splitting has a power-law distribution of the flux content with an index of -2 as a time-independent solution. These results support that the frequency distribution of the flux content in the analyzed flux range is rapidly maintained by merging and splitting, namely, surface processes. We suggest a model for frequency distributions of cancellation and emergence based on this idea.

Iida, Y.; Yokoyama, T. [Department of Earth and Planetary Science, University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113-0033 (Japan); Hagenaar, H. J. [Lockheed Martin Advanced Technology Center, Org. ADBS, Building 252, 3251 Hanover Street, Palo Alto, CA 94304 (United States)

2012-06-20T23:59:59.000Z

118

Ductless Mini-Split Air Conditioners | Department of Energy  

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

Ductless Mini-Split Air Conditioners Ductless Mini-Split Air Conditioners Ductless Mini-Split Air Conditioners August 9, 2012 - 4:05pm Addthis A ductless mini-split air conditioner is one solution to cooling part of a house. | Photo courtesy of ©iStockphoto/LUke1138. A ductless mini-split air conditioner is one solution to cooling part of a house. | Photo courtesy of ©iStockphoto/LUke1138. What does this mean for me? A ductless mini-split air conditioner is easier to install than a central air conditioning system. A ductless mini-split air conditioner provides zoned air conditioning without ducting. A ductless mini-split air conditioner is relatively easy to install and does not provide an entry point for intruders as some room air conditioners do. Ductless, mini split-system air-conditioners (mini splits) have numerous

119

Ductless Mini-Split Air Conditioners | Department of Energy  

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

Ductless Mini-Split Air Conditioners Ductless Mini-Split Air Conditioners Ductless Mini-Split Air Conditioners August 9, 2012 - 4:05pm Addthis A ductless mini-split air conditioner is one solution to cooling part of a house. | Photo courtesy of ©iStockphoto/LUke1138. A ductless mini-split air conditioner is one solution to cooling part of a house. | Photo courtesy of ©iStockphoto/LUke1138. What does this mean for me? A ductless mini-split air conditioner is easier to install than a central air conditioning system. A ductless mini-split air conditioner provides zoned air conditioning without ducting. A ductless mini-split air conditioner is relatively easy to install and does not provide an entry point for intruders as some room air conditioners do. Ductless, mini split-system air-conditioners (mini splits) have numerous

120

Subcritical Stein manifolds are split K. Cieliebak  

E-Print Network (OSTI)

Subcritical Stein manifolds are split K. Cieliebak April 30, 2002 1 Introduction This note concerns the following little observation. Theorem 1.1. Every subcritical Stein manifold (domain) is deformation equiv domains are compact, whereas Stein manifolds are noncompact. Subcritical. It is well

Cieliebak, Kai

Note: This page contains sample records for the topic "microearthquake shear-wave splitting" 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

Characterization Of Fracture Patterns In The Geysers Geothermal...  

Open Energy Info (EERE)

navigation, search OpenEI Reference LibraryAdd to library Report: Characterization Of Fracture Patterns In The Geysers Geothermal Reservoir By Shear-Wave Splitting Abstract The...

122

Characterization of subsurface fracture patterns in the Coso...  

Open Energy Info (EERE)

LibraryAdd to library Conference Proceedings: Characterization of subsurface fracture patterns in the Coso geothermal reservoir by analyzing shear-wave splitting of...

123

TEMPORAL VARIATIONS OF FRACTURE DIRECTIONS AND FRACTURE DENSITIES...  

Open Energy Info (EERE)

TEMPORAL VARIATIONS OF FRACTURE DIRECTIONS AND FRACTURE DENSITIES IN THE COSO GEOTHERMAL FIELD FROM ANALYSES OF SHEAR-WAVE SPLITTING Jump to: navigation, search OpenEI Reference...

124

Focussing the view on Nature's water-splitting catalyst  

E-Print Network (OSTI)

formation in synthetic Mn-catalyst. Inorg. Chem. 43, 264-Nature’s water-splitting catalyst Samir Zein 1,2 , Leonid V.Nature’s water splitting catalyst Abstract About 3 billion

Yano, Junko

2008-01-01T23:59:59.000Z

125

Design of water-splitting photocatalysts by first principles computations  

E-Print Network (OSTI)

This thesis focuses on the design of novel inorganic water-splitting photocatalysts for solar applications using first principles computations. Water-splitting photocatalysts are materials that can photo-catalyze the ...

Wu, Yabi

2014-01-01T23:59:59.000Z

126

DOE's Gasoline/Diesel PM Split Study | Department of Energy  

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

Desert Research Institute 2003deerfujita.pdf More Documents & Publications DOE's GasolineDiesel PM Split Study DOE's GasolineDiesel PM Split Study Long-Term Changes in Gas-...

127

Catalyst for splitting water &Catalyst for splitting water & Synthetic Modeling of InorganicSynthetic Modeling of Inorganic  

E-Print Network (OSTI)

Importance Hydrogen technology in fuel cellsHydrogen technology in fuel cells As a combustion fuel, it producesCatalyst for splitting water &Catalyst for splitting water & Synthetic Modeling of Inorganic of evolution ·Optimized catalyst for water splitting in all oxygenic phototrophs S0 S4 S1 S2 S3 O2 2 H O2 e- e

Petta, Jason

128

Scattering of horizontally-polarized shear waves by surface irregularities  

Science Journals Connector (OSTI)

......7 : A T/2 / y='7/3 r 6 T = _ _ _ _ _ 7=0 3 y =TW I WTI 0 1 2 ?=wa 3 *B Figure 11. Graph of displacement amplitude...positions indicated along the boundary of the irregularity. 3 t I WTI 1 0 , ,a 9, 2 I I I I , ` 7 l = U a / H p 7 0 1 2 3 4 5 0 2......

Leslie B. Sills

1978-08-01T23:59:59.000Z

129

Shearing waves and the MRI dynamo in stratified accretion discs  

E-Print Network (OSTI)

to note that this thesis was edited in ViM and Inkscape, and makes use of RAMSES, all of which have GPL-compatible licenses, as well as many smaller pieces of code that I wrote myself. For plotting I used gnuplot, which has a more restrictive free software...

Donnelly, Cara

2014-01-07T23:59:59.000Z

130

Anomalous shear wave attenuation in the shallow crust beneath...  

Open Energy Info (EERE)

10 km volume of the shallow crust (one shallower than 5 km) that severely attenuate SV waves passing through them. These anomalies lie beneath the Indian Wells Valley 30 km south...

131

Ductless, Mini-Split Heat Pump Basics | Department of Energy  

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

Ductless, Mini-Split Heat Pump Basics Ductless, Mini-Split Heat Pump Basics Ductless, Mini-Split Heat Pump Basics August 19, 2013 - 11:04am Addthis Ductless, mini-split-system heat pumps (mini splits), as their name implies, do not have ducts. Therefore, they make good retrofit add-ons to houses or buildings with "non-ducted" heating systems, such as hydronic (hot water heat), radiant panels, and space heaters (wood, kerosene, propane). They can also be a good choice for room additions, where extending or installing distribution ductwork is not feasible. How Ductless, Mini-Split Heat Pumps Work Like standard air-source heat pumps, mini splits have two main components: an outdoor compressor/condenser, and an indoor air-handling unit. A conduit, which houses the power cable, refrigerant tubing, suction tubing,

132

Ductless, Mini-Split Heat Pumps | Department of Energy  

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

Ductless, Mini-Split Heat Pumps Ductless, Mini-Split Heat Pumps Ductless, Mini-Split Heat Pumps June 24, 2012 - 4:19pm Addthis What does this mean for me? You can take advantage of the fact that -- unlike earlier versions -- newer models of ductless mini-split heat pumps operate effectively in cold temperatures. If you are building an addition or doing a major remodel and your home does not have heating and cooling ducts, a ductless mini-split heat pump may be a cost-effective, energy-efficient choice. Ductless, mini-split-system heat pumps (mini splits) make good retrofit add-ons to houses with "non-ducted" heating systems, such as hydronic (hot water heat), radiant panels, and space heaters (wood, kerosene, propane). They can also be a good choice for room additions where extending or

133

Improving the efficiency of water splitting in dye-sensitized...  

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

Improving the efficiency of water splitting in dye-sensitized solar cells by using a biomimetic electron transfer mediator Authors: Zhao, Y., Swierk, J. R., Megiatto, J. D.,...

134

Towards a Design of a Complete Solar Water Splitting System  

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

Solar Water Splitting System 1 Feb 2013 BISfuel : A team of Bisfuel researchers led by Devens Gust, Ana Moore and Tom Moore has designed and characterized an artificial...

135

A Relaxed-Projection Splitting Algorithm for Variational Inequalities ...  

E-Print Network (OSTI)

Dec 13, 2013 ... [23] Fukushima, M. A Relaxed projection for variational inequalities. ... [45] Tseng, P. A modified forward-backward splitting method for maximal ...

2013-12-13T23:59:59.000Z

136

A direct splitting method for nonsmooth variational inequalities  

E-Print Network (OSTI)

Tseng, P.: A modified forward-backward splitting method for maximal monotone mappings. ... Fukushima, M.: A Relaxed projection for variational inequalities.

2013-07-24T23:59:59.000Z

137

Hyperfine splitting in muonic hydrogen constrains new pseudoscalar interactions  

E-Print Network (OSTI)

We constrain the possibility of a new pseudoscalar coupling between the muon and proton using a recent measurement of the 2S hyperfine splitting in muonic hydrogen.

Keung, W -Y

2015-01-01T23:59:59.000Z

138

Molecules to Materials for PEC Water Splitting  

SciTech Connect

Advances in heterogeneous catalysis are driven by the formation of structure-property relationships at solid-liquid and solid-gaseous interfaces. The establishment of these relationships relies on cooperative research efforts on several fronts: prediction and analysis using high-level theoretical models, the development of new synthetic methods to prepare specific solid-state compositions and structures, new analytical methods to identify the active site and define interfacial properties, and mechanistic analysis of functioning catalysts. However, customized materials that allow for fine control of the interfacial properties at solid-liquid boundaries represent difficult synthetic targets. We have been investigating molecular synthons as precursors to advanced materials to address this challenge. In this presentation, we will discuss (1) the chemistry of molecular inorganic complexes, (2) their conversion to mixed-metal oxides, and (3) structure-property relationships of the resulting oxides relevant to PEC water splitting.

Neale, N. R.; Ruddy, D. A.; Lee, K.; Seabold, J. A.; Deutsch, T. G.; Dukovic, G.

2013-01-01T23:59:59.000Z

139

Scientific Drilling (1989) 1: 21-26 0 Springer-Veriag1989  

E-Print Network (OSTI)

reservoir change by about 7" before and after hydraulic fracturing. The polarizations change from parallel of hydraulic fracturing to measure in situ stress. This study demonstrates that shear-wave splitting may: Shear-wave splitting, Hydraulic fracturing, Crack-anisotropy, Stress orientations Introduction Shear

Edinburgh, University of

140

Geophys. J. Int. (2007) doi: 10.1111/j.1365-246X.2007.03475.x GJISeismology  

E-Print Network (OSTI)

stations and 10 broad-band stations deployed in French Polynesia from 2001 to 2005 in the framework beneath French Polynesia from shear wave splitting Fabrice R. Fontaine,1,2 Guilhem Barruol,1,3 Andr is investigated by analysing shear wave splitting parameters at eight permanent long-period and broad-band seismic

Barruol, Guilhem

Note: This page contains sample records for the topic "microearthquake shear-wave splitting" from the National Library of EnergyBeta (NLEBeta).
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they are not comprehensive nor are they the most current set.
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to obtain the most current and comprehensive results.


141

POLYNOMIAL IDENTITIES AND NON-IDENTITIES OF SPLIT JORDAN PAIRS  

E-Print Network (OSTI)

POLYNOMIAL IDENTITIES AND NON-IDENTITIES OF SPLIT JORDAN PAIRS Erhard Neher Abstract. We show that split Jordan pairs over rings without 2-torsion can be distinguished by polynomial identities with integer coefficients. In particular, this holds for simple finite-dimensional Jordan pairs over

Neher, Erhard

142

Visible Light Water Splitting Using Dye-Sensitized Oxide Semiconductors  

E-Print Network (OSTI)

- ical energy in the form of fuels. Hydrogen is a key solar fuel because it can be used directly. This Account describes our approach to two problems in solar water splitting: the organization of molecules in photochemistry.1,2 Efficient photocatalytic water-splitting systems could have practical value for solar energy

143

Engineering fast and stable splitting of matter waves  

E-Print Network (OSTI)

When attempting to split coherent cold atom clouds or a Bose-Einstein condensate (BEC) by bifurcation of the trap into a double well, slow adiabatic following is unstable with respect to any slight asymmetry, and the wave "collapses" to the lower well, whereas a generic fast chopping splits the wave but it also excites it. Shortcuts to adiabaticity engineered to speed up the adiabatic process through non-adiabatic transients, provide instead quiet and robust fast splitting. The non-linearity of the BEC makes the proposed shortcut even more stable.

E. Torrontegui; S. Martínez-Garaot; M. Modugno; Xi Chen; J. G. Muga

2012-07-13T23:59:59.000Z

144

EUROCK 2006 Multiphysics Coupling and Long Term Behaviour in Rock Mechanics Van Cotthem, Charlier, Thimus & Tshibangu (eds)  

E-Print Network (OSTI)

observations of stress-aligned shear- wave splitting (seismic birefringence) in hydro-carbon reservoirs-WAVE SPLITTING The key phenomenon for observing the internal micro- cracked structure of rocks is stress

145

Two Electron Holes in Hematite Facilitate Water Splitting  

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

Two Electron Holes in Hematite Facilitate Water Splitting Print Two Electron Holes in Hematite Facilitate Water Splitting Print Hydrogen is an attractive form of fuel because its only by-product is nonpolluting water vapor. The problem, however, is that the production of hydrogen-via the process of water splitting-currently requires the burning of traditional fossil fuels. Therefore, water splitting by photoelectrochemical cells (PECs) fueled by solar power has long been a primary goal of sustainable energy research. One roadblock to this goal is that the search for stable, affordable, high-performance PEC electrodes has so far failed to identify an ideal material. Now, researchers from Switzerland, China, and Berkeley have gained an in-depth understanding of the electronic structure of hematite (iron oxide), a promising PEC photoanode candidate, by performing in situ and operando soft x-ray spectroscopy at ALS Beamline 7.0.1.

146

Two Electron Holes in Hematite Facilitate Water Splitting  

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

Two Electron Holes in Hematite Facilitate Water Splitting Print Two Electron Holes in Hematite Facilitate Water Splitting Print Hydrogen is an attractive form of fuel because its only by-product is nonpolluting water vapor. The problem, however, is that the production of hydrogen-via the process of water splitting-currently requires the burning of traditional fossil fuels. Therefore, water splitting by photoelectrochemical cells (PECs) fueled by solar power has long been a primary goal of sustainable energy research. One roadblock to this goal is that the search for stable, affordable, high-performance PEC electrodes has so far failed to identify an ideal material. Now, researchers from Switzerland, China, and Berkeley have gained an in-depth understanding of the electronic structure of hematite (iron oxide), a promising PEC photoanode candidate, by performing in situ and operando soft x-ray spectroscopy at ALS Beamline 7.0.1.

147

DOE - Office of Legacy Management -- WNI Split Rock Site - 043  

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

Split Rock Site - 043 Split Rock Site - 043 FUSRAP Considered Sites Site: WNI Split Rock Site (043) Designated Name: Alternate Name: Location: Evaluation Year: Site Operations: Site Disposition: Radioactive Materials Handled: Primary Radioactive Materials Handled: Radiological Survey(s): Site Status: The Western Nuclear, Inc. (WNI) Split Rock site is a Uranium Mill Tailings Remedial Action (UMTRA) Title II site located in Jeffrey City, Wyoming. UMTRA Title II sites are privately owned and operated sites that were active when the Uranium Mill Tailings Control Act was passed in 1978. The majority of the milling conducted at these sites was for private sale, but a portion was sold to the U.S. Government. After the owner completes U.S. Nuclear Regulatory Commission license termination, the Department of

148

Two Electron Holes in Hematite Facilitate Water Splitting  

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

Two Electron Holes in Hematite Facilitate Water Splitting Print Two Electron Holes in Hematite Facilitate Water Splitting Print Hydrogen is an attractive form of fuel because its only by-product is nonpolluting water vapor. The problem, however, is that the production of hydrogen-via the process of water splitting-currently requires the burning of traditional fossil fuels. Therefore, water splitting by photoelectrochemical cells (PECs) fueled by solar power has long been a primary goal of sustainable energy research. One roadblock to this goal is that the search for stable, affordable, high-performance PEC electrodes has so far failed to identify an ideal material. Now, researchers from Switzerland, China, and Berkeley have gained an in-depth understanding of the electronic structure of hematite (iron oxide), a promising PEC photoanode candidate, by performing in situ and operando soft x-ray spectroscopy at ALS Beamline 7.0.1.

149

On the Relative Strength of Different Generalizations of Split Cuts  

E-Print Network (OSTI)

Nov 7, 2012 ... Cook, Kannan and Schrijver [CKS90] presented a simple .... it follows that PI ? SC(P), namely split cuts do not cut off any point in the set PI.

Author

2012-11-07T23:59:59.000Z

150

Solar water splitting in a molecular photoelectrochemical cell  

Science Journals Connector (OSTI)

Solar water splitting in a molecular photoelectrochemical...Artificial photosynthesis and the production of solar fuels could be a key element in a future...solution to the energy storage problem in solar energy conversion. We describe a hybrid...

Leila Alibabaei; M. Kyle Brennaman; Michael R. Norris; Berç Kalanyan; Wenjing Song; Mark D. Losego; Javier J. Concepcion; Robert A. Binstead; Gregory N. Parsons; Thomas J. Meyer

2013-01-01T23:59:59.000Z

151

Mini-Split Heat Pumps Multifamily Retrofit Feasibility Study  

SciTech Connect

Mini-split heat pumps can provide space heating and cooling in many climates and are relatively affordable. These and other features make them potentially suitable for retrofitting into multifamily buildings in cold climates to replace electric resistance heating or other outmoded heating systems. This report investigates the suitability of mini-split heat pumps for multifamily retrofits. Various technical and regulatory barriers are discussed and modeling was performed to compare long-term costs of substituting mini-splits for a variety of other heating and cooling options. A number of utility programs have retrofit mini-splits in both single family and multifamily residences. Two such multifamily programs are discussed in detail.

Dentz, J.; Podorson, D.; Varshney, K.

2014-05-01T23:59:59.000Z

152

Field Monitoring Protocol: Mini-Split Heat Pumps  

SciTech Connect

The report provides a detailed method for accurately measuring and monitoring performance of a residential Mini-Split Heat Pump. It will be used in high-performance retrofit applications, and as part of DOE's Building America residential research program.

Christensen, D.; Fang, X.; Tomerlin, J.; Winkler, J.; Hancock, E.

2011-03-01T23:59:59.000Z

153

Split system CO2 heat pump water heaters  

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

Split-system-CO2-heat-pump-water-heaters- Sign In About | Careers | Contact | Investors | bpa.gov Search Policy & Reporting Expand Policy & Reporting EE Sectors Expand EE...

154

NLO QCD corrections to triple collinear splitting functions  

E-Print Network (OSTI)

In this article, we study the triple-collinear limit of scattering amplitudes, focusing the discussion in processes which include at least one photon. To deal with infrared divergences we applied dimensional regularization (DREG) and we worked in the time-like (TL) kinematical region in order to ensure the validity of strict-collinear factorization. Both polarized and unpolarized splitting functions were obtained using independent codes, which allowed to implement a first cross-check among them. The divergent structure of all the triple-collinear splittings was compared with the Catani's formula, and we found a complete agreement. Moreover, in the polarized case, this comparison imposed additional constraints in the finite part of some master integrals (MI). The analysis of photon-started splittings led to very compact expressions, because of gauge invariance. These contributions were identified with the Abelian terms of the remaining splitting functions, which constitutes another cross-check of the results.

German F. R. Sborlini

2014-10-07T23:59:59.000Z

155

A Novel Split-Cycle Engine | Department of Energy  

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

Directions in Engine-Efficiency and Emissions Research (DEER) Conference in Detroit, MI, September 27-30, 2010. p-17tour.pdf More Documents & Publications Splitting the Cycle...

156

Entropy satisfying flux vector splittings and kinetic BGK models  

Science Journals Connector (OSTI)

We establish forward and backward relations between entropy satisfying BGK relaxation models such as those introduced previously by the author and the first order flux vector splitting numerical methods for general systems of conservation laws. Classically, ...

F. Bouchut

2003-06-01T23:59:59.000Z

157

CONVERGENCE RATE ANALYSIS OF PRIMAL-DUAL SPLITTING ...  

E-Print Network (OSTI)

Abstract. Primal-dual splitting schemes are a class of powerful algorithms ... this paper, we are mainly concerned with the line of work that began in [38, 14, 23].

2014-08-19T23:59:59.000Z

158

Plasmonic Photoanodes for Solar Water Splitting with Visible Light  

Science Journals Connector (OSTI)

Plasmonic Photoanodes for Solar Water Splitting with Visible Light ... The contribution of X.J. was supported by a postdoctoral fellowship from the Natural Sciences and Engineering Research Council of Canada and by National Science Foundation grant no. ...

Joun Lee; Syed Mubeen; Xiulei Ji; Galen D. Stucky; Martin Moskovits

2012-08-23T23:59:59.000Z

159

Geological and industrial implications of extensive-dilatancy anisotropy  

Science Journals Connector (OSTI)

... earthquakes are expected11'12. Shear-wave splitting has also been observed above acoustic events in geothermal experiments13'14; in shear-wave vertical-seismic-profiles (VSPs) in a ... experiments13'14; in shear-wave vertical-seismic-profiles (VSPs) in a geothermal reservoir15'16, in sedimentary basins17"20, and elsewhere21'22; and in most shear- ...

Stuart Crampin

1987-08-06T23:59:59.000Z

160

The Split-up project: induction, context and knowledge discovery in law  

Science Journals Connector (OSTI)

......to... the THE SPLIT-UP PROJECT 155 reasoner'. Certainly...deprive any person of life, liberty, or property, without due...436 (1966) THE SPLIT-UP PROJECT 157 4. Learning from cases-the...Split-Up system In the Split-Up project (Stranieri et al., 1999......

John Zeleznikow

2004-06-01T23:59:59.000Z

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


161

Learning How Nature Uses Sunlight to Split Water  

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

Mn4Ca Structure. (click on image for diagram portraying the water-splitting catalytic cycle) Mn4Ca Structure. (click on image for diagram portraying the water-splitting catalytic cycle) Scientific Highlight LBNL Press Release Physical Biosciences, LBNL 30 November 2006 Learning How Nature Splits Water (Condensed by Brad Plummer from a press release issued by Lawrence Berkeley National Laboratory) Billions of years ago, primitive bacteria developed a way to harness sunlight to split water molecules into protons, electrons and oxygen-the cornerstone of photosynthesis. Now, a team of scientists has taken a major step toward understanding this process by deriving the precise structure of the catalytic metal-cluster center containing four manganese atoms and one calcium atom (Mn4Ca) that drives this water-splitting reaction. This catalytic center resides in a large protein complex, called photosystem II, found in plants, green algae, and cyanobacteria. The international team was led by scientists from LBNL, and includes scientists from Germany's Technical and Free Universities in Berlin, the Max Planck Institute in Mülheim, and from SSRL.

162

Geometric Doppler Effect: Spin-Split Dispersion of Thermal Radiation  

Science Journals Connector (OSTI)

A geometric Doppler effect manifested by a spin-split dispersion relation of thermal radiation is observed. A spin-dependent dispersion splitting was obtained in a structure consisting of a coupled thermal antenna array. The effect is due to a spin-orbit interaction resulting from the dynamics of the surface waves propagating along the structure whose local anisotropy axis is rotated in space. The observation of the spin-symmetry breaking in thermal radiation may be utilized for manipulation of spontaneous or stimulated emission.

Nir Dahan; Yuri Gorodetski; Kobi Frischwasser; Vladimir Kleiner; Erez Hasman

2010-09-21T23:59:59.000Z

163

Higgs, Binos and Gluinos: Split Susy within Reach  

SciTech Connect

Recent results from the LHC for the Higgs boson with mass between 142 GeV {approx}< m{sub h{sup 0}} {approx}< 147 GeV points to PeV-scale Split Supersymmetry. This article explores the consequences of a Higgs mass in this range and possible discovery modes for Split Susy. Moderate lifetime gluinos, with decay lengths in the 25 {micro}m to 10 yr range, are its imminent smoking gun signature. The 7TeV LHC will be sensitive to the moderately lived gluinos and trilepton signatures from direct electroweakino production. Moreover, the dark matter abundance may be obtained from annihilation through an s-channel Higgs resonance, with the LSP almost purely bino and mass m{sub {chi}{sub 1}{sup 0}} {approx_equal} 70 GeV. The Higgs resonance region of Split Susy has visible signatures in dark matter direct and indirect detection and electric dipole moment experiments. If the anomalies go away, the majority of Split Susy parameter space will be excluded.

Alves, Daniele S.M.; Izaguirre, Eder; /SLAC /Stanford U., Phys. Dept.; Wacker, Jay G.; /SLAC /Stanford U., ITP

2012-09-14T23:59:59.000Z

164

Wave splitting of Maxwell's equations with anisotropic heterogeneous constitutive relations  

E-Print Network (OSTI)

The equations for the electromagnetic field in an anisotropic media are written in a form containing only the transverse field components relative to a half plane boundary. The operator corresponding to this formulation is the electromagnetic system's matrix. A constructive proof of the existence of directional wave-field decomposition with respect to the normal of the boundary is presented. In the process of defining the wave-field decomposition (wave-splitting), the resolvent set of the time-Laplace representation of the system's matrix is analyzed. This set is shown to contain a strip around the imaginary axis. We construct a splitting matrix as a Dunford-Taylor type integral over the resolvent of the unbounded operator defined by the electromagnetic system's matrix. The splitting matrix commutes with the system's matrix and the decomposition is obtained via a generalized eigenvalue-eigenvector procedure. The decomposition is expressed in terms of components of the splitting matrix. The constructive solution to the question on the existence of a decomposition also generates an impedance mapping solution to an algebraic Riccati operator equation. This solution is the electromagnetic generalization in an anisotropic media of a Dirichlet-to-Neumann map.

B. L. G. Jonsson

2008-09-04T23:59:59.000Z

165

A RANK FORMULA FOR ACYLINDRICAL SPLITTINGS RICHARD WEIDMANN  

E-Print Network (OSTI)

A RANK FORMULA FOR ACYLINDRICAL SPLITTINGS RICHARD WEIDMANN Dedicated to Michel Boileau on the occasion of his 60th birthday Abstract. We prove a rank formula for arbitrary acylindrical graphs of groups in the rank of its fundamental group. Introduction Grushko's Theorem states that the rank of groups

Weidmann, Richard

166

Ductless Mini-Split Heat Pump Comfort Evaluation  

SciTech Connect

Field tests were conducted in two homes in Austin, TX to evaluate the comfort performance of ductless mini-split heat pumps (DMSHPs), measuring temperature and relative humidity measurements in four rooms in each home before and after retrofitting a central HVAC system with DMSHPs.

Roth, K.; Sehgal, N.; Akers, C.

2013-03-01T23:59:59.000Z

167

PedSplit: pedigree management for stratified analysis  

Science Journals Connector (OSTI)

......facilitates pedigree management for gene-gene interaction...also provides a simple approach for calculating haplotype...PedSplit is a pedigree management utility that provides...complexities and conundra? Science, 302, 822-826...haplotype relative risk' approach to detecting allelic......

M. B. Lanktree; L. VanderBeek; F. M. Macciardi; J. L. Kennedy

2004-09-01T23:59:59.000Z

168

Randomized Load Balancing by Joining and Splitting Bins James Aspnes  

E-Print Network (OSTI)

Consider the following load balancing scenario: a certain amount of work load is distributed among a setRandomized Load Balancing by Joining and Splitting Bins James Aspnes Yitong Yin § 1 Introduction, one of the existing machines gives some of its load to the new machine; and upon a departure

Aspnes, James

169

Improved Approximations for Max Set Splitting and Max NAE SAT  

E-Print Network (OSTI)

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

Ye, Yinyu

170

Department of Mechanical Engineering Spring 2011 Split Cycle Engine Concept  

E-Print Network (OSTI)

PENNSTATE Department of Mechanical Engineering Spring 2011 Split Cycle Engine Concept Overview: Volvo Powertrain has been one of the main developers and producers of heavy engines that fulfill fuel economy. The goal is to look at the current 13L US10 engine line and improve the engine's fuel

Demirel, Melik C.

171

Lighting energy savings potential of split-pane electrochromic windows  

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

Lighting energy savings potential of split-pane electrochromic windows Lighting energy savings potential of split-pane electrochromic windows controlled for daylighting with visual comfort Title Lighting energy savings potential of split-pane electrochromic windows controlled for daylighting with visual comfort Publication Type Journal Article LBNL Report Number LBNL-6152E Year of Publication 2013 Authors Fernandes, Luis L., Eleanor S. Lee, and Gregory J. Ward Journal Energy and Buildings Volume 61 Pagination 8-20 Abstract A simulation study was conducted to evaluate lighting energy savings of split-pane electrochromic (EC) windows controlled to satisfy key visual comfort parameters. Using the Radiance lighting simulation software, interior illuminance and luminance levels were computed for a south-facing private office illuminated by a window split into two independently-controlled EC panes. The transmittance of these was optimized hourly for a workplane illuminance target while meeting visual comfort constraints, using a least-squares algorithm with linear inequality constraints. Blinds were successively deployed until visual comfort criteria were satisfied. The energy performance of electrochromics proved to be highly dependent on how blinds were controlled. With hourly blind position adjustments, electrochromics showed significantly higher (62% and 53%, respectively without and with overhang)lighting energy consumption than clear glass. With a control algorithm designed to better approximate realistic manual control by an occupant, electrochromics achieved significant savings (48% and 37%, respectively without and with overhang). In all cases, energy consumption decreased when the workplace illuminance target was increased. In addition, the fraction of time during which the occupant had an unobstructed view of the outside was significantly greater with electrochromics: 10 months out of the year versus a handful of days for the reference case.

172

A Microearthquakes Survey in the Ethiopian Rift  

Science Journals Connector (OSTI)

...density, highly porous airborne vol- canic ejecta near...explosions for such stress-release experiments cannot be...a)+e2 /7 f is the fraction of stress drop and a...Steinbrugge Pacific Fire Rating Bureau San Francisco...fault belt without the release of seismic energy. Hence...

Peter Molnar; Thomas J. Fitch; Laika Mariam Asfaw

173

Microearthquake Technology for EGS Fracture Characterization  

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

Project objectives: To understand how EGS fracture networks develop; To develop technology to determine accurate absolute three-dimensional positions of EGS fracture networks.

174

San Andreas Split Geothermal Region | Open Energy Information  

Open Energy Info (EERE)

form form View source History View New Pages Recent Changes All Special Pages Semantic Search/Querying Get Involved Help Apps Datasets Community Login | Sign Up Search Page Edit with form History Facebook icon Twitter icon » San Andreas Split Geothermal Region Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home San Andreas Split Geothermal Region Details Areas (0) Power Plants (0) Projects (0) Techniques (0) Assessment of Moderate- and High-Temperature Geothermal Resources of the United States[1] References ↑ "Assessment of Moderate- and High-Temperature Geothermal Resources of the United States" Geothermal Region Data State(s) California Area 18,246 km²18,246,000,000 m² 7,042.956 mi² 196,398,119,400 ft² 21,822,216,000 yd² 4,508,677.83 acres USGS Resource Estimate for this Region

175

Lighting energy savings potential of split-pane electrochromic windows controlled for  

E-Print Network (OSTI)

LBNL-6152E Lighting energy savings potential of split- pane electrochromic windows controlled potential of split-pane electrochromic windows controlled for daylighting with visual comfort L was conducted to evaluate lighting energy savings of split-pane electrochromic (EC) windows controlled

176

Paper Number Sizing and Optimal Operation of a Power Split Hydraulic  

E-Print Network (OSTI)

operation becomes more complex. Drive train sizing and system operation in a power-split hybrid vehiclePaper Number Sizing and Optimal Operation of a Power Split Hydraulic Hybrid Drive Train Felicitas operation of a power-split drive train. A method for sizing components, and a modal operation in which

Li, Perry Y.

177

Fuel consumption of a vehicle with power split CVT system  

Science Journals Connector (OSTI)

Continuously variable transmissions have made notable progress, especially in the automotive industry, in recent years. In this work, we study the performance of a mid passenger car provided with an original Power Split CVT (PS-CVT) system. The main advantage of the proposed solution is to improve the efficiency of the CVT by means of a power flow without recirculation using two separate phases of operation. By means of a simulation model we evaluate the vehicle's fuel consumption with the hypothesis to consider the value of transmission ratio speed that minimises the specific fuel consumption. Furthermore the PS-CVT performance is compared with that of traditional CVT.

Giacomo Mantriota

2005-01-01T23:59:59.000Z

178

Interference-induced splitting of resonances in spontaneous emission  

E-Print Network (OSTI)

We study the resonance fluorescence from a coherently driven four-level atom in the Y-type configuration. The effects of quantum interference induced by spontaneous emission on the fluorescence properties of the atom are investigated. It is found that the quantum interference resulting from cascade emission decays of the atom leads to a splitting of resonances in the excited level populations calculated as a function of light detuning. For some parameters, interference assisted enhancement of inner sidebands and narrowing of central peaks may also occur in the fluorescence spectrum. We present a physical understandingof our numerical results using the dressed state description of the atom-light interaction.

R. Arun

2007-10-06T23:59:59.000Z

179

AN ARECIBO SURVEY FOR ZEEMAN SPLITTING IN OH MEGAMASER GALAXIES  

SciTech Connect

We present the results of a comprehensive survey using the Arecibo Observatory for Zeeman splitting of OH lines in OH megamasers (OHMs). A total of 77 sources were observed with the Arecibo telescope. Of these, maser emission could not be detected for eight sources, and two sources were only ambiguously detected. Another 27 sources were detected at low signal-to-noise ratios or with interference that prevented placing any useful limits on the presence of magnetic fields. In 26 sources, it was possible to place upper limits on the magnitude of magnetic fields, typically between 10 and 30 mG. For 14 sources, the Stokes V spectra exhibit features consistent with Zeeman splitting. Eleven of these 14 are new detections, and the remaining three are re-detections of Stokes V detections in Robishaw et al. Among confident new detections, we derive magnetic fields associated with maser regions with magnitudes ranging from 6.1 to 27.6 mG. The distribution of magnetic field strengths suggests the magnetic fields in OH masing clouds in OHMs are larger than those in Galactic OH masers. The results are consistent with magnetic fields playing a dynamically important role in OH masing clouds in OHMs.

McBride, James; Heiles, Carl, E-mail: jmcbride@astro.berkeley.edu, E-mail: heiles@astro.berkeley.edu [Department of Astronomy, University of California, Berkeley, CA 94720-3411 (United States)] [Department of Astronomy, University of California, Berkeley, CA 94720-3411 (United States)

2013-01-20T23:59:59.000Z

180

High Efficiency, Spectrum Splitting Solar Cell Assemblies: Design, Measurement and Analysis  

Science Journals Connector (OSTI)

A spectrum splitting photovoltaic architecture was proposed for high energy conversion efficiency. Assemblies of this architecture were constructed, measured and analyzed, which allow...

Barnett, Allen; Wang, Xiaoting

Note: This page contains sample records for the topic "microearthquake shear-wave splitting" 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

Split Alliance in Couple Therapy: Exploration of Four Types of Alliance Discrepancy.  

E-Print Network (OSTI)

??This paper explores four types of splits in couple therapy alliance - discrepancies where one spouse's rating of an aspect of alliance (alliance with therapist,… (more)

Goldsmith, Jacob Ze'ev Barnett

2008-01-01T23:59:59.000Z

182

Focussing the view on Nature's water-splitting catalyst  

SciTech Connect

About 3 billion years ago Nature invented a catalyst that splits water with highefficiency into molecular oxygen and hydrogen equivalents (protons and electrons). This reaction is energetically driven by sun light and the active centre contains relatively cheap and abundant metals: manganese and calcium. This biological system therefore forms the paradigm for all man made attempts for direct solar fuel production and several studies are underway to determine the electronic and geometric structures of this catalyst. In this report we briefly summarize the problems and the current status of these efforts, and propose a DFT-based strategy for obtaining a reliable high resolution structure of this unique catalyst that includes both the inorganic core and the first ligand sphere.

Messinger, Johannes; Yano, Junko

2008-01-01T23:59:59.000Z

183

Electromagnetic Contribution to the Proton-Neutron Mass Splitting  

E-Print Network (OSTI)

We study the electromagnetic contribution to the proton-neutron mass splitting by combining lattice simulations and the modified Cottingham sum rule of Walker-Loud, Carlson and Miller. This analysis yields an estimate of the isovector nucleon magnetic polarizability as a function of pion mass. The physical value, obtained by chiral extrapolation to the physical pion mass, is $\\beta_{p-n}=(-1.12 \\pm 0.40)\\times 10^{-4}\\ \\mathrm{fm}^3$, which is in agreement with the empirical result, albeit with a somewhat smaller error. As a result, we find $\\delta M^{\\gamma}_{p-n}=1.04 \\pm 0.11\\ \\mathrm{MeV}$, which represents a significant improvement in precision.

A. W. Thomas; X. G. Wang; R. D. Young

2014-06-18T23:59:59.000Z

184

Interaction between graphene and metamaterials: split rings vs. wire pairs  

SciTech Connect

We have recently shown that graphene is unsuitable to replace metals in the current-carrying elements of metamaterials. At the other hand, experiments have demonstrated that a layer of graphene can modify the optical response of a metal-based metamaterial. Here we study this electromagnetic interaction between metamaterials and graphene. We show that the weak optical response of graphene can be modified dramatically by coupling to the strong resonant fields in metallic structures. A crucial element determining the interaction strength is the orientation of the resonant fields. If the resonant electric field is predominantly parallel to the graphene sheet (e.g., in a complementary split-ring metamaterial), the metamaterial’s resonance can be strongly damped. If the resonant field is predominantly perpendicular to the graphene sheet (e.g., in a wire-pair metamaterial), no significant interaction exists.

Zou, Yanhong; Tassin, Philippe; Koschny, Thomas; Soukoulis, Costas

2012-05-14T23:59:59.000Z

185

AdSplit: Separating smartphone advertising from applications  

E-Print Network (OSTI)

A wide variety of smartphone applications today rely on third-party advertising services, which provide libraries that are linked into the hosting application. This situation is undesirable for both the application author and the advertiser. Advertising libraries require additional permissions, resulting in additional permission requests to users. Likewise, a malicious application could simulate the behavior of the advertising library, forging the user's interaction and effectively stealing money from the advertiser. This paper describes AdSplit, where we extended Android to allow an application and its advertising to run as separate processes, under separate user-ids, eliminating the need for applications to request permissions on behalf of their advertising libraries. We also leverage mechanisms from Quire to allow the remote server to validate the authenticity of client-side behavior. In this paper, we quantify the degree of permission bloat caused by advertising, with a study of thousands of downloaded ap...

Shekhar, Shashi; Wallach, Dan S

2012-01-01T23:59:59.000Z

186

The Running coupling BFKL anomalous dimensions and splitting functions.  

E-Print Network (OSTI)

ar X iv :h ep -p h/ 01 03 21 0v 2 7 Ju n 20 01 Cavendish-HEP-01/03 The Running Coupling BFKL Anomalous Dimensions and Splitting Functions Robert S. Thorne1 Cavendish Laboratory, University of Cambridge Madingley Road, Cambridge, CB3 0HE, U... that it is is dominated by the NLO corrections at all values of x below about x = 0.01. For example, using the formulae in [11] the first few terms in the power series for P (x) go like xP (x,Q2) =?¯s + 2.4?¯4s?3/6 + 2.1?¯6s?5/120 + · · · ? ?¯s(0.43?¯s + 1.6?¯2s? + 11.7?...

Thorne, Robert S

187

Fiber to the Premise (FTTP) Industry Structure: Implications of a Wholesale-Retail Split  

E-Print Network (OSTI)

Fiber to the Premise (FTTP) Industry Structure: Implications of a Wholesale-Retail Split Anupam facilities to competing service providers (retailers), who then provide voice, video and data service over the shared network (wholesale-retail split). The network owner can either wholesale dark fiber or "lit

Sirbu, Marvin

188

Computation of the split factor of earth fault currents by considering the proximity effects  

Science Journals Connector (OSTI)

To determine a safe substation grounding grid in power systems, it is important to compute the split factor for earth fault current including the proximity influences among the grid and the earthing systems of the incoming/outgoing transmission lines' ... Keywords: earth fault currents, grounding grid design, proximity effects, split factor, touch and step voltages

N. Ramezani; S. M. Shahrtash

2010-06-01T23:59:59.000Z

189

AIMS, Dresden, Germany, May 25-28, 2010 Higher Order Operator-Splitting Methods  

E-Print Network (OSTI)

AIMS, Dresden, Germany, May 25-28, 2010 Higher Order Operator-Splitting Methods based on Zassenhaus Univerist¨at zu Berlin, D- Berlin, Germany AIMS, Dresden, Germany, May 25-28, 2010 Gamze Tanoglu, J¨urgen Geiser Higher Order Operator-Splitting Methods #12;AIMS, Dresden, Germany, May 25-28, 2010 Outline 1

Geiser, Juergen

190

Dynamics of photogenerated holes in surface modified ?-Fe2O3 photoanodes for solar water splitting  

Science Journals Connector (OSTI)

...photogenerated holes in surface modified {alpha}-Fe2O3 photoanodes for solar water splitting 10...primarily to enhanced electron depletion in the Fe2O3 for a given applied bias. Efficient hydrogen generation...photogenerated holes in surface modified ?-Fe2O3 photoanodes for solar water splitting...

Monica Barroso; Camilo A. Mesa; Stephanie R. Pendlebury; Alexander J. Cowan; Takashi Hisatomi; Kevin Sivula; Michael Grätzel; David R. Klug; James R. Durrant

2012-01-01T23:59:59.000Z

191

Data representations of Zeeman spatial beam splitting in polarized neutron reflectometry  

Science Journals Connector (OSTI)

The different Zeeman energy effects in neutron reflectivity experiments and their influence on beam splitting are reviewed. The representation of Zeeman splitting data in several coordinate systems is discussed, and the use of such data to directly extract information on magnetic thin-film systems is examined.

Kozhevnikov, S.

2012-07-14T23:59:59.000Z

192

Geophys. J. Int. (2012) doi: 10.1111/j.1365-246X.2012.05497.x GJIGeodynamicsandtectonics  

E-Print Network (OSTI)

-mantle anisotropy beneath the Cameroon Volcanic Line and Congo Craton from shear wave splitting measurements with different splitting parameters. The Congo Craton in southern Cameroon and the Garoua rift region the Congo Craton and the CVL, in central Cameroon, the fast directions are variable and have small splitting

193

Crystal-Field Splitting and Giant Negative Magnetization in  

SciTech Connect

Bimetallic oxalates are a class of layered organic magnets with transi- tion metals M(II) and M'(III) coupled by oxalate molecules in an open honeycomb structure. Of particular interest are the Fe(II)Fe(III) bimetal- lic compounds, which are ferrimagnetically ordered below a transition temperature that ranges from 30 to 48 K, depending on the cation that separates the layers. In small magnetic fields, several of these compounds exhibit giant negative magnetization below a compensation temperature of roughly 2/3 Tc. By studying the behavior of the Kramer's doublet ground state produced by the crystal-field splitting and constructing a reduced Hamiltonian that includes both exchange and spin-orbit and in- teractions, we can explain all of the important behavior of this class of materials: the stability of magnetic order in two dimensions and the existence of magnetic compensation in samples with high transition tem- peratures. We also provide several new predictions for the spin-wave gap and the optical flipping of the magnetic moment.

Fishman, Randy Scott [ORNL; Reboredo, Fernando A [ORNL

2007-01-01T23:59:59.000Z

194

Electro-optic voltage sensor with Multiple Beam Splitting  

DOE Patents (OSTI)

A miniature electro-optic voltage sensor system capable of accurate operation at high voltages without use of the dedicated voltage dividing hardware. The invention achieves voltage measurement without significant error contributions from neighboring conductors or environmental perturbations. The invention employs a transmitter, a sensor, a detector, and a signal processor. The transmitter produces a beam of electromagnetic radiation which is routed into the sensor. Within the sensor the beam undergoes the Pockels electro-optic effect. The electro-optic effect produces a modulation of the beam's polarization, which is in turn converted to a pair of independent conversely-amplitude-modulated signals, from which the voltage of the E-field is determined by the signal processor. The use of converse AM signals enables the signal processor to better distinguish signal from noise. The sensor converts the beam by splitting the beam in accordance with the axes of the beam's polarization state (an ellipse) into at least two AM signals. These AM signals are fed into a signal processor and processed to determine the voltage between a ground conductor and the conductor on which voltage is being measured.

Woods, Gregory K. (Cornelius, OR); Renak, Todd W. (Idaho Falls, ID); Crawford, Thomas M. (Idaho Falls, ID); Davidson, James R. (Idaho Falls, ID)

2000-01-01T23:59:59.000Z

195

Electro-optic voltage sensor with beam splitting  

DOE Patents (OSTI)

The invention is a miniature electro-optic voltage sensor system capable of accurate operation at high voltages without use of the dedicated voltage dividing hardware typically found in the prior art. The invention achieves voltage measurement without significant error contributions from neighboring conductors or environmental perturbations. The invention employs a transmitter, a sensor, a detector, and a signal processor. The transmitter produces a beam of electromagnetic radiation which is routed into the sensor. Within the sensor the beam undergoes the Pockels electro-optic effect. The electro-optic effect produces a modulation of the beam's polarization, which is in turn converted to a pair of independent conversely-amplitude-modulated signals, from which the voltage of the E-field is determined by the signal processor. The use of converse AM signals enables the signal processor to better distinguish signal from noise. The sensor converts the beam by splitting the beam in accordance with the axes of the beam's polarization state (an ellipse) into at least two AM signals. These AM signals are fed into a signal processor and processed to determine the voltage between a ground conductor and the conductor on which voltage is being measured.

Woods, Gregory K. (Cornelius, OR); Renak, Todd W. (Idaho Falls, ID); Davidson, James R. (Idaho Falls, ID); Crawford, Thomas M. (Idaho Falls, ID)

2002-01-01T23:59:59.000Z

196

A modified split-supply switched-reluctance drive inverter  

SciTech Connect

This paper describes the application of a new simple voltage-boosting feature to split-supply SR (switched-reluctance) inverter. As its name implies, the SR motor always operates in switching mode and has distinct motoring and generating rotor angular regions. The effectiveness of the energy conversion process of SR motor depends basically on the ability of its inverter to inject adequate current during the positive-torque angular region and to reduce the current to negligible value during negative-torque angular region. The modified inverter effectively generates boost voltages for accelerating current build-up and decay and hence enhances the performance of SR drives. Benefits of the added boosting include: higher average current, better energy recovery during commutation and a wider feasible speed range. This paper will assess the implications of the boost feature on inverter cost and performance. A time-stepping simulation procedure which includes the modelling of current overlapping between phases will be presented together with simulation results.

Chan, S.; Omar, A.M. [Mara Inst. of Tech., Selangor (Malaysia). Dept. of Electrical Engineering

1995-12-31T23:59:59.000Z

197

New experimental techniques with the split Hopkinson pressure bar  

SciTech Connect

The split Hopkinson pressure bar or Kolsky bar has provided for many years a technique for performing compression tests at strain rates approaching 10/sup 4/ s/sup -1/. At these strain rates, the small dimensions possible in a compression test specimen give an advantage over a dynamic tensile test by allowing the stress within the specimen to equilibrate within the shortest possible time. The maximum strain rates possible with this technique are limited by stress wave propagation in the elastic pressure bars as well as in the deforming specimen. This subject is reviewed in this paper, and it is emphasized that a slowly rising excitation is preferred to one that rises steeply. Experimental techniques for pulse shaping and a numerical procedure for correcting the raw data for wave dispersion in the pressure bars are presented. For tests at elevated temperature a bar mover apparatus has been developed which effectively brings the cold pressure bars into contact with the specimen, which is heated with a specially designed furnace, shortly before the pressure wave arrives. This procedure has been used successfully in tests at temperatures as high as 1000/sup 0/C.

Frantz, C.E.; Follansbee, P.S.; Wright, W.J.

1984-01-01T23:59:59.000Z

198

Long-range Cooper pair splitting Enhanced by Supercurrent  

E-Print Network (OSTI)

We investigate crossed Andreev reflection (CAR) in a long-range normal metal-superconductor-normal metal junction, with the superconductor carrying a supercurrent along the junction. The energy splitting of quasiparticles in the superconductor induced by the supercurrent opens an energy window, in which CAR can occur over a distance between two normal leads much larger than the superconducting coherence length, with another nonlocal process of elastic cotunneling being completely quenched. As a result, CAR is significantly enhanced within the energy window, and dominates the nonlocal transport, which can be directly measured by the nonlocal differential conductance. The nonlocal entangled electron pairs generated via inverse CAR may belong to opposite or equal energy levels beyond the tunneling limit, and the total entanglement production rate within a unit bias voltage is solely determined by the CAR probability as $\\mathcal{P}=2(1-A_2)A_2/h$. Our work indicates that a long-range Cooper pair splitter with high efficiency of nonlocal entanglement production can be implemented by simply driving a supercurrent.

Wei Chen; D. N. Shi; D. Y. Xing

2014-08-09T23:59:59.000Z

199

Note: Zeeman splitting measurements in a high-temperature plasma  

SciTech Connect

The Zeeman effect has been used for measurement of magnetic fields in low-temperature plasma, but the diagnostic technique is difficult to implement in a high-temperature plasma. This paper describes new instrumentation and methodology for simultaneous measurement of the entire Doppler-broadened left and right circularly polarized Zeeman spectra in high-temperature plasmas. Measurements are made using spectra emitted parallel to the magnetic field by carbon impurities in high-temperature plasma. The Doppler-broadened width is much larger than the magnitude of the Zeeman splitting, thus simultaneous recording of the two circularly polarized Zeeman line profiles is key to accurate measurement of the magnetic field in the ZaP Z-pinch plasma device. Spectral data are collected along multiple chords on both sides of the symmetry axis of the plasma. This enables determination of the location of the current axis of the Z-pinch and of lower-bound estimates of the local magnetic field at specific radial locations in the plasma.

Golingo, R. P.; Shumlak, U.; Den Hartog, D. J. [Aerospace and Energetics Research Program, University of Washington, Seattle, Washington 98195-2250 (United States)

2010-12-15T23:59:59.000Z

200

Towards Structural Determination of the Water-splitting Enzyme PURIFICATION, CRYSTALLIZATION, AND PRELIMINARY CRYSTALLOGRAPHIC STUDIES OF PHOTOSYSTEM  

E-Print Network (OSTI)

Towards Structural Determination of the Water-splitting Enzyme PURIFICATION, CRYSTALLIZATION functions as a water/plastoquinone oxidoreductase in the thylakoid membrane of chloroplasts and cyanobacteria yielding oxygen, protons, and reduced plastoqui- none by the splitting of water. Powered

Roegner, Matthias

Note: This page contains sample records for the topic "microearthquake shear-wave splitting" 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

Compressional-wave and shear-wave velocities from long-spaced sonic waveforms  

E-Print Network (OSTI)

-SPACED SONIC TOOL UT LTF R L TNR 3' Lr TN R LrTFR LT 10' C FR NR 8' D I FRI (( 'I ll NrR ) ( rt I ll ))8. I ) 8 I I I I ) I I I l I I I-I Ii& I ? ? +) ? +l ?? I I~ I lk ) I LT I ? I I 10' A LT Figure 2. Configuration... REFERENCES 56 VITA 58 LIST OF TABLES TABLE Page I Input parameters for synthetic sonic waveforms. 23 2 Synthetic waveform computed slowness error ? 9"-diameter borehole. . . . 25 3 Synthetic waveform computed slowness error ? 4"-diameter borehole...

Lake, Leonard Cornelius

2012-06-07T23:59:59.000Z

202

Correction for distortion in polarization of reflected shear-waves in isotropic and anisotropic media.  

E-Print Network (OSTI)

??The progressive growth of onshore shale production (both gas and liquids) to replace depleting and aging oil fields may benefit from the use of surface… (more)

Campbell, Terence A

2014-01-01T23:59:59.000Z

203

Reflection and refraction of antiplane shear waves at a plane boundary between viscoelastic anisotropic media  

Science Journals Connector (OSTI)

...Wavefronts in dissipative anisotropic media: comparison of the...at a plane boundary between anisotropic media. J. Acoust. Soc...1987 Physical properties of shale at temperature and pressure...waves and cylindrical waves in anisotropic anelastic media. J. Geophys...

1997-01-01T23:59:59.000Z

204

Effects of point singularities on shear-wave propagation in sedimentary basins  

Science Journals Connector (OSTI)

......the rockmass. In all anisotropic solids, however, there...to lithology, as in shales, or to fine layering...leads to orthorhombic anisotropic symmetry, which implies...aligned grains, as in shales. Such lithologic anisotropy...elastic constants of the anisotropic structures used in this......

Stuart Crampin

1991-12-01T23:59:59.000Z

205

Viability of shear-wave amplitude versus offset studies in anisotropic media  

Science Journals Connector (OSTI)

......amplitude versus offset studies in anisotropic media Gareth S. Yardley 1...viable method of determining anisotropic parameters in thin reservoir...for example a gas sand to shale interface), without substantially...SV-waves at an isotropic/anisotropic reflector. The second layer......

Gareth S. Yardley; Gerhard Graham; Stuart Crampin

1991-12-01T23:59:59.000Z

206

Shear-wave seismic reflection studies of unconsolidated sediments in the near surface  

Science Journals Connector (OSTI)

...comparison on the Oak Ridge Reservation, Tennessee: GeophysicsGPYSA70016-8033...Survey Scientific Investigations Report 2007-5226...plume groundwater remedial investigation/feasibility study...California, Volume 1 - Remedial investigation: Prepared for...

Seth S. Haines; Karl J. Ellefsen

207

Compressional and Shear-Wave Velocity versus Depth Relations for Common Rock Types in Northern California  

Science Journals Connector (OSTI)

...1 1.638 4 0.31 4 5.28 Merritt sand (Qm) 0.024 0.986 1 0.43 1 2.30 Merritt sand (Qm) 0.030 1.610 1 0.31 1 5.21 Merritt sand (Qm) 0.037 1.610...Pilot Hole Vp and Vs logs. Nick Christensen provided unpublished...

Thomas M. Brocher

208

High Frequency Shear Waves Guided by a Continuous Lithosphere Descending beneath western South America  

Science Journals Connector (OSTI)

......earthquakes beneath northern Argentina and Bolivia. High frequency...earthquakes the high frequency energy arrives clearly later...beneath northern Chile and Argentina. 138 Gaps in other...frequency (near 1 Hz) energy arriving at the appropriate...Tonga, northern Chile-Argentina, and Indonesia. B......

Bryan L. Isacks; Muawia Barazangi

1973-08-01T23:59:59.000Z

209

Compressional and shear wave anisotropy in the oceanic lithosphere - the Ngendei seismic refraction experiment  

Science Journals Connector (OSTI)

......Sereno T. J. , Orcutt J. A., 1985. The synthesis of realistic oceanic P n wave trains, J. geophys. Res., 90, 12755-12776. Shearer P. , Orcutt J., 1985. Anisotropy in the oceanic lithosphere - theory and observations from the Ngendei seismic......

P. M. Shearer; J. A. Orcutt

1986-12-01T23:59:59.000Z

210

Seismic Shear Waves in Deep Seismic Reflection Surveys: Some Notes on Problems and Profits  

Science Journals Connector (OSTI)

—Shear (S) waves differ from compressional (P) waves because of their lower propagation velocities, their lower frequencies and due to the different character of their particle motion. The move-out of travel-time...

E. Lüschen

1999-09-01T23:59:59.000Z

211

Detailed mapping of seismic anisotropy with local shear waves in southeastern Kamchatka  

Science Journals Connector (OSTI)

......related to mantle deformation processes (see reviews by Silver 1996...above the slab and tectonic processes in subduction zones, J. geophys...Trans. AGU, 84(46), Full Mtg. Supplement, Abstract T52E-02...associated with the subduction process provide an excellent source......

V. Levin; D. Droznin; J. Park; E. Gordeev

2004-09-01T23:59:59.000Z

212

Identification and inversion of converted shear waves: case studies from the European North Atlantic continental margins  

Science Journals Connector (OSTI)

......arrivals and enhanced energy scattering. Identifying...may be viable phase converters, arrivals converted...associated with vigorous ocean bottom currents...internal structure of ocean island volcanoes...al, 2001. Mantle thermal structure and active...inProceedings of the Ocean Drilling Program......

Jennifer D. Eccles; Robert S. White; Philip A. F. Christie

2009-10-01T23:59:59.000Z

213

Compressional and shear wave properties of marine sediments: Comparisons between theory and data  

E-Print Network (OSTI)

, unconsolidated marine sedi- ments. It is evident from the data that an unconsolidated sediment is capable discussion that the slow wave in an unconsolidated sediment is negligible if not absent alto- gether propagation in an unconsolidated granular medium, that is to say, a material in which the mineral grains

Buckingham, Michael

214

3-D shear wave radially and azimuthally anisotropic velocity model of the North American upper mantle  

Science Journals Connector (OSTI)

......partially during the subsequent tectonism of flat Farallon subduction (Humphreys et al...Thick-structured Proterozoic lithosphere of the Rocky Mountain region, GSA Today, 11, 4-9...azimuthal anisotropy beneath the Colorado Rocky Mountains, in The Rocky Mountain Region-An......

Huaiyu Yuan; Barbara Romanowicz; Karen M. Fischer; David Abt

2011-03-01T23:59:59.000Z

215

Shear wave velocity, seismic attenuation, and thermal structure of the continental upper mantle  

Science Journals Connector (OSTI)

......where E* is the activation energy, R is the gas constant, tau...This is achieved by use of a cost function based on the norm...Petrologic and non-steady-state geothermal constraints available for these...1965. Attenuation of seismic energy in upper mantle, J. geophys......

Irina M. Artemieva; Magali Billien; Jean-Jacques Lévêque; Walter D. Mooney

2004-05-01T23:59:59.000Z

216

Measurement of sound speed vs. depth in South Pole ice: pressure waves and shear waves  

E-Print Network (OSTI)

0908.3251. [29] B. Semburg, HADES–Hydrophone for Acousticand two sensor modules of the “HADES” design with one sensorDetection at South Pole”, HADES [29]). The sensors are

Klein, Spencer

2010-01-01T23:59:59.000Z

217

SEPARATRIX SPLITTING IN 3D VOLUME-PRESERVING MAPS HECTOR E. LOMELi AND RAFAEL RAMiREZ-ROS  

E-Print Network (OSTI)

, such structures are called Hill's spherical vortices or spheromaks. We study the splitting of the separatrix under

218

On t-branch split cuts for mixed-integer programs  

E-Print Network (OSTI)

Nov 9, 2011 ... When n = 2, the mixed-integer set is the same as the Cook, Kannan and ... 1.1 Split cuts and the Cook-Kannan-Schrijver example .... To start off,.

2011-11-09T23:59:59.000Z

219

Lattice-free sets, multi-branch split disjunctions, and mixed-integer ...  

E-Print Network (OSTI)

Cook, Kannan and Schrijver [10] presented a very simple MIP which cannot be solved with split cuts alone. ...... in (2) defined as the points of LP cut off by. T. + T.

2013-01-21T23:59:59.000Z

220

Splitting Atoms, Fracturing Landscapes: Policymaking, Environmental Science, and the Nuclear Complex, 1945-1960  

E-Print Network (OSTI)

"Splitting Atoms, Fracturing Landscapes: Policymaking, Environmental Science, and the Nuclear Complex, 1945-1960" examines the implications of an expansive nuclear culture in the postwar United States. This dissertation probes the intersection...

Oatsvall, Neil Shafer

2013-05-31T23:59:59.000Z

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


221

Replacing Resistance Heating with Mini-Split Heat Pumps, Sharon, Connecticut (Fact Sheet)  

SciTech Connect

Mini-split heat pumps can provide space heating and cooling in many climates and are relatively affordable. These and other features make them potentially suitable for retrofitting into multifamily buildings in cold climates to replace electric resistance heating or other outmoded heating systems. This report investigates the suitability of mini-split heat pumps for multifamily retrofits. Various technical and regulatory barriers are discussed and modeling was performed to compare long-term costs of substituting mini-splits for a variety of other heating and cooling options. A number of utility programs have retrofit mini-splits in both single family and multifamily residences. Two such multifamily programs are discussed in detail.

Not Available

2014-05-01T23:59:59.000Z

222

High strain rate mechanical characterization of trabecular bone utilizing the split-Hopkinson pressure bar technique  

E-Print Network (OSTI)

The split-Hopkinson pressure bar (SHPB) technique has been in use in one form or another for more than fifty years and has recently gained a great deal of attention for its ability to characterize materials such as metals, ...

Johnson, Timothy Paul Mahal

2005-01-01T23:59:59.000Z

223

Generalized Split-Explicit Runge–Kutta Methods for the Compressible Euler Equations  

Science Journals Connector (OSTI)

The compressible Euler equations exhibit wave phenomena on different scales. A suitable spatial discretization results in partitioned ordinary differential equations where fast and slow modes are present. Generalized split-explicit methods for the ...

Oswald Knoth; Joerg Wensch

2014-05-01T23:59:59.000Z

224

Development of a Solar-Thermal ZnO/Zn Water-Splitting Thermochemical...  

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

Development of a Solar-thermal ZnOZn Water-splitting Thermochemical Cycle Final Report (DE-PS36-03GO93007 - Subcontract RF-05-SHGR-006) Alan W. Weimer (PI), Christopher Perkins,...

225

Mineral Mössbauer spectroscopy: Correlations between chemical shift and quadrupole splitting parameters  

Science Journals Connector (OSTI)

The variety of coordination numbers, symmetries, distortions and ligand environments in thermally-stable iron-bearing minerals provide wide ranges of chemical shift (?) and quadrupole splitting (?) parameters, wh...

Roger G. Burns

1994-01-01T23:59:59.000Z

226

Physica D 210 (2005) 149179 Exponentially small separatrix splittings and almost invisible  

E-Print Network (OSTI)

Physica D 210 (2005) 149­179 Exponentially small separatrix splittings and almost invisible exponential term e-22/h has the same properties. Finally, we have detected some almost invisible homoclinic

Ramírez-Ros, Rafael

227

Eavesdropping on secure deterministic communication with qubits through photon-number-splitting attacks  

SciTech Connect

A collective photon-number-splitting attack strategy is proposed, which combines photon-number-splitting attack with an unambiguous set discrimination of quantum state. Verified by this attack strategy, it is shown that a two-way quantum secure direct communication protocol with qubits is insecure in real circumstance. Finally, we present a possible improved version of this kind of quantum secure direct communication protocol.

Lin Song [State Key Laboratory of Networking and Switching Technology, Beijing University of Posts and Telecommunications, Beijing 100876 (China); School of Mathematics and Computer Science, Fujian Normal University, Fuzhou 350007 (China); Wen Qiaoyan; Gao Fei [State Key Laboratory of Networking and Switching Technology, Beijing University of Posts and Telecommunications, Beijing 100876 (China); Zhu Fuchen [National Laboratory for Modern Communications, P.O. Box 810, Chengdu 610041 (China)

2009-05-15T23:59:59.000Z

228

Reactive-coupling-induced normal mode splittings in microdisk resonators coupled to waveguides  

SciTech Connect

We study the optomechanical design introduced by M. Li et al. [Phys. Rev. Lett. 103, 223901 (2009)], which is very effective for investigation of the effects of reactive coupling. We show the normal mode splitting that is due solely to reactive coupling rather than due to dispersive coupling. We suggest feeding the waveguide with a pump field along with a probe field and scanning the output probe for evidence of reactive-coupling-induced normal mode splitting.

Huang Sumei; Agarwal, G. S. [Department of Physics, Oklahoma State University, Stillwater, Oklahoma 74078 (United States)

2010-05-15T23:59:59.000Z

229

Light-by-light scattering single-logarithmic corrections to hyperfine splitting in muonium  

Science Journals Connector (OSTI)

We consider three-loop radiative-recoil corrections to hyperfine splitting in muonium generated by the gauge invariant set of diagrams with virtual light-by-light scattering block. These corrections are enhanced by the large logarithms of the electron-muon mass ratio. We present the results of an analytic calculation of the single-logarithmic radiative-recoil corrections of order ?2(Z?)(m/M)EF to hyperfine splitting in muonium generated by these diagrams.

Michael I. Eides and Valery A. Shelyuto

2013-01-10T23:59:59.000Z

230

Cobalt Sulphide Microtube Array as Cathode in Photoelectrochemical Water Splitting with Photoanodes  

E-Print Network (OSTI)

catalyses hydrogen evolution efficiently in both neutral and basic aqueous electrolyte solution. The microtubular 5 CoS electrode was also combined with a hematite photoanode to give a photoelectrochemical water splitting cell. 10 15... promising approach to convert intermittent sunlight into a storable and renewable chemical fuel, H2. 1 The success of clean water splitting systems will not only rely on the development of a 20 device consisting of robust, efficient, inexpensive...

Lin, Chia-Yu; Mersch, Dirk; Jefferson, David A.; Reisner, Erwin

2014-08-15T23:59:59.000Z

231

Solar High Temperature Water-Splitting Cycle with Quantum Boost  

SciTech Connect

A sulfur family chemical cycle having ammonia as the working fluid and reagent was developed as a cost-effective and efficient hydrogen production technology based on a solar thermochemical water-splitting cycle. The sulfur ammonia (SA) cycle is a renewable and sustainable process that is unique in that it is an all-fluid cycle (i.e., with no solids handling). It uses a moderate temperature solar plant with the solar receiver operating at 800°C. All electricity needed is generated internally from recovered heat. The plant would operate continuously with low cost storage and it is a good potential solar thermochemical hydrogen production cycle for reaching the DOE cost goals. Two approaches were considered for the hydrogen production step of the SA cycle: (1) photocatalytic, and (2) electrolytic oxidation of ammonium sulfite to ammonium sulfate in aqueous solutions. Also, two sub-cycles were evaluated for the oxygen evolution side of the SA cycle: (1) zinc sulfate/zinc oxide, and (2) potassium sulfate/potassium pyrosulfate. The laboratory testing and optimization of all the process steps for each version of the SA cycle were proven in the laboratory or have been fully demonstrated by others, but further optimization is still possible and needed. The solar configuration evolved to a 50 MW(thermal) central receiver system with a North heliostat field, a cavity receiver, and NaCl molten salt storage to allow continuous operation. The H2A economic model was used to optimize and trade-off SA cycle configurations. Parametric studies of chemical plant performance have indicated process efficiencies of ~20%. Although the current process efficiency is technically acceptable, an increased efficiency is needed if the DOE cost targets are to be reached. There are two interrelated areas in which there is the potential for significant efficiency improvements: electrolysis cell voltage and excessive water vaporization. Methods to significantly reduce water evaporation are proposed for future activities. Electrolysis membranes that permit higher temperatures and lower voltages are attainable. The oxygen half cycle will need further development and improvement.

Taylor, Robin [SAIC] [SAIC; Davenport, Roger [SAIC] [SAIC; Talbot, Jan [UCSD] [UCSD; Herz, Richard [UCSD] [UCSD; Genders, David [Electrosynthesis Co.] [Electrosynthesis Co.; Symons, Peter [Electrosynthesis Co.] [Electrosynthesis Co.; Brown, Lloyd [TChemE] [TChemE

2014-04-25T23:59:59.000Z

232

Light confinement and mode splitting in rolled-up semiconductor microtube bottle resonators  

Science Journals Connector (OSTI)

We report on the controlled light confinement in microtube bottle resonators formed by rolled-up strained semiconductor bilayers. We experimentally and theoretically discuss two important properties of this novel kind of microcavities: the axial light confinement and the mode splitting by broken rotational symmetry. Our model bases on the adiabatic separation of circular and axial mode propagation. The circular problem is solved by a simple waveguide model for the specific geometry along the microtube axis. These solutions act as a quasipotential in a quasi-Schrödinger equation for the axial propagation. We experimentally investigated microtubes with two different axial confinement mechanisms: lobes of varying winding number in the rolling edge and etched rings of a varying wall thickness along the microtube axis. For the microtubes with lobes, we observe a very good quantitative agreement with our model and show that axial mode dispersion can even be tailored by the shape of the lobe. For the microtubes with etched rings, we observe only a qualitative agreement. These microtubes exhibit a well pronounced mode splitting by broken rotational symmetry that is analyzed by two-dimensional finite-difference time-domain simulations. We observe an oscillating behavior of the amplitude of the splitting as well as of the quality factors of the split modes under variation of the winding number. We show that the splitting is connected to the axial confinement.

Ch. Strelow; C. M. Schultz; H. Rehberg; M. Sauer; H. Welsch; A. Stemmann; Ch. Heyn; D. Heitmann; T. Kipp

2012-04-30T23:59:59.000Z

233

The splitted laser beam filamentation in interaction of laser and an exponential decay inhomogeneous underdense plasma  

SciTech Connect

The splitted beam filamentation in interaction of laser and an exponential decay inhomogeneous underdense plasma is investigated. Based on Wentzel-Kramers-Brillouin (WKB) approximation and paraxial/nonparaxial ray theory, simulation results show that the steady beam width and single beam filamentation along the propagation distance in paraxial case is due to the influence of ponderomotive nonlinearity. In nonparaxial case, the influence of the off-axial of {alpha}{sub 00} and {alpha}{sub 02} (the departure of the beam from the Gaussian nature) and S{sub 02} (the departure from the spherical nature) results in more complicated ponderomotive nonlinearity and changing of the channel density and refractive index, which led to the formation of two/three splitted beam filamentation and the self-distortion of beam width. In addition, influence of several parameters on two/three splitted beam filamentation is discussed.

Xia Xiongping; Yi Lin [Department of Physics, Huazhong University of Science and Technology, Wuhan 430074 (China); Xu Bin [Department of Mathematics and Information Sciences, North China Institute of Water Conservancy and Hydroelectric Power, Zhengzhou 450011 (China); Lu Jianduo [Department of Physics, Huazhong University of Science and Technology, Wuhan 430074 (China); Hubei Province Key Laboratory of Systems Science in Metallurgical Process, Wuhan University of Science and Technology, Wuhan 430081 (China)

2011-10-15T23:59:59.000Z

234

Effect of Doppler broadening on Autler-Townes splitting in the molecular cascade excitation scheme  

Science Journals Connector (OSTI)

Theoretical analysis of the Autler-Townes splitting pattern in a three-level cascade excitation of a Doppler-broadened sample reveals that the observed Autler-Townes splitting is not only a function of the coupling-laser Rabi frequency, as in the homogeneously broadened case, but can also strongly depend on the wavenumber ratio of the coupling and probe lasers. Utilizing a steady-state density matrix formalism, we derive exact expressions for the populations of the intermediate and upper levels for a homogeneously broadened system. In the limit of a weak probe field, analytical expressions for Doppler-broadened excitation spectra from the intermediate and upper levels are derived. Using these expressions, we investigate the critical role of Doppler broadening on the observation of Autler-Townes splitting and its asymptotic behavior as a function of the coupling Rabi frequency for counterpropagating and copropagating configurations for different wavenumber ratios of the lasers.

E. Ahmed and A. M. Lyyra

2007-11-09T23:59:59.000Z

235

Split Vertex Deletion meets Vertex Cover: New fixed-parameter and exact exponential-time algorithms  

Science Journals Connector (OSTI)

In the Split Vertex Deletion problem, given a graph G and an integer k, we ask whether one can delete k vertices from the graph G to obtain a split graph (i.e., a graph, whose vertex set can be partitioned into two sets: one inducing a clique and the second one inducing an independent set). In this paper we study exact (exponential-time) and fixed-parameter algorithms for Split Vertex Deletion.• We show that, up to a factor quasipolynomial in k and polynomial in n, the Split Vertex Deletion problem can be solved in the same time as the well-studied Vertex Cover problem. By plugging in the currently best fixed-parameter algorithm for Vertex Cover due to Chen et al. [Theor. Comput. Sci. 411 (40–42) (2010) 3736–3756], we obtain an algorithm that solves Split Vertex Deletion in time O ( 1.2738 k k O ( log k ) + n 3 ) . • We show that all maximal induced split subgraphs of a given n-vertex graph can be listed in O ( 3 n / 3 n O ( log n ) ) time. To achieve our goals, we prove the following structural result that may be of independent interest: for any graph G we may compute a family P of size n O ( log n ) containing partitions of V ( G ) into two parts, such that for any two disjoint sets X C , X I ? V ( G ) where G [ X C ] is a clique and G [ X I ] is an independent set, there is a partition in P which contains all vertices of X C on one side and all vertices of X I on the other. Moreover, the family P can be enumerated in O ( n O ( log n ) ) time.

Marek Cygan; Marcin Pilipczuk

2013-01-01T23:59:59.000Z

236

Neutron halo and spin-orbit splitting in some neutron-rich nuclei  

Science Journals Connector (OSTI)

The density-dependent relativistic mean-field theory with ?, ?, and ? mesons, as a parameter-free calculation, has been used to study the ground-state properties of Be12,14, Ne30,32, Ca60,62, and Zr122,124. A special emphasis is placed on the influence of the ? tensor coupling on the neutron halo and on the spin-orbit splitting. It is shown for the first time that the inclusion of the ? tensor coupling will lead to the isospin-dependent spin-orbit splitting although the binding energy and the radius of these nuclei are insensitive to it.

Zhongzhou Ren; M. Mittig; Baoqiu Chen; Zhongyu Ma; G. Auger; Gongou Xu

1995-10-01T23:59:59.000Z

237

High Efficiency Spectrum Splitting Prototype Submodule Using Commercial CPV Cells (Presentation)  

SciTech Connect

This presentation summarizes progress on the design, fabrication and testing of a proof-of-concept, prototype spectrum splitting CPV submodule using commercial CPV cells, aimed at demonstrating an independently confirmed efficiency above 40% at STC (1000 W/m2, AM1.5D ASTM G173-03, 25 degrees C).

Keevers, M.; Lau, J.; Green, M.; Thomas, I.; Lasich, J.; King, R.; Emery, K.

2014-11-01T23:59:59.000Z

238

ANALYSIS OF OPERATOR SPLITTING IN THE NON-ASYMPTOTIC REGIME FOR NONLINEAR REACTION  

E-Print Network (OSTI)

and their high degree of liberty in terms of choice of dedicated numerical solvers for the split subproblems are implemented for which a general mathematical This research was supported by an ANR project grant (French National Research Agency - ANR Blancs): S´echelles (PI S. Descombes - 2009-2013), by a DIGITEO RTRA project

239

Landau-Level Splitting in Graphene in High Magnetic Fields Z. Jiang,1,3  

E-Print Network (OSTI)

indicates that the Landau level at the charge neutral Dirac point splits into four sublevels, lifting fields B > 20 T, indicating the lifting of the fourfold degeneracy of the previously observed QH states be attributed to lifting of the spin degeneracy of the n 1 Landau level. DOI: 10.1103/PhysRevLett.96

Kim, Philip

240

Polyhedral Specular Reflector Design for Ultra-High Spectrum Splitting Solar Module Efficiencies (>50%)  

E-Print Network (OSTI)

Polyhedral Specular Reflector Design for Ultra-High Spectrum Splitting Solar Module Efficiencies., Pasadena, CA, USA 95555-0345 ABSTRACT One pathway to achieving ultra-high solar efficiencies (>50, multijunction solar cell, solar concentrator 1. INTRODUCTION Solar cell efficiency is increased through

Atwater, Harry

Note: This page contains sample records for the topic "microearthquake shear-wave splitting" 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

An Efficient Operator-Splitting Method for Noise Removal in Images  

E-Print Network (OSTI)

, removal of additive, zero-mean noise in digital images is investigated. We use the ideas proposed in [1An Efficient Operator-Splitting Method for Noise Removal in Images D. KRISHNAN , P. LIN and X. C. TAI Abstract In this work, noise removal in digital images is investigated. The importance

Soatto, Stefano

242

Water-Splitting Photoelectrolysis Reaction Rate via Microscopic Imaging of Evolved Oxygen Bubbles  

E-Print Network (OSTI)

to directly split water in a semiconductor photoelectrochemical cell is a promising source of carbon-free fuel Institute of Technology, Pasadena, California 91125, USA Bubble formation and growth on a water of the gas-evolving reaction rate. Optical microscopy was used to record the bubble growth on single

Atwater, Harry

243

The anatomy of the fruit in relation to the propensity of citrus species to split  

E-Print Network (OSTI)

The anatomy of the fruit in relation to the propensity of citrus species to split A. Garcõ�cnica de Valencia, 46071 Valencia, Spain Accepted 29 March 2000 Abstract The anatomy of the fruit has been of clementine mandarin (Fino, Clementina de Nules and Orogrande), and in Owari satsuma mandarin. The fruit

Ljubljana, University of

244

Split-Awards and Disputes: An Experimental Study of a Strategic Model of Litigation  

E-Print Network (OSTI)

@ualberta.ca (C.M. Landeo). #12;1 Introduction Tort reform in the U.S. has typically been motivated by the common premiums.2 Some reforms take the form of caps or limits on punitive damage awards while others mandate reforms, called "split-awards" have been implemented in Alaska, California,4 Georgia, Illinois, Indiana

245

A splitting method for numerical simulation of free surface flows of incompressible fluids with surface tension  

E-Print Network (OSTI)

with surface tension Kirill D. Nikitin Maxim A. Olshanskii Kirill M. Terekhov Yuri V. Vassilevski§ Abstract to surface tension forces. The method splits one time step into a semi-Lagrangian treatment of the surface models a free surface flow of viscous incompressible fluid subject to surface tension forces. Further

Olshanskii, Maxim A.

246

Algorithms for the splitting of formal series; applications to alien differential calculus  

E-Print Network (OSTI)

Algorithms for the splitting of formal series; applications to alien differential calculus Fr effective calculations with ´Ecalle's alien derivations for these series. We apply our techniques to some of alien derivations on these series, generalizing the ones made in [8] for equation of rank

Dumas, Jean-Guillaume

247

On measuring low-degree p-mode frequency splitting with full-disc integrated data  

Science Journals Connector (OSTI)

......increase of 100 nHz in the solar rotational frequency...splittings of low-degree solar modes. Measurements...stable as a resonance cell. These improvements...combination of better technology and better measurement...systematic errors in the solar case, they cannot presently......

T. Appourchaux; H.-Y. Chang; D. O. Gough; T. Sekii

2000-12-01T23:59:59.000Z

248

Solving the Capacitated Vehicle Routing Problem and the Split Delivery using GRASP Metaheuristic  

E-Print Network (OSTI)

vehicles, where total cost is minimal, beginning and ending in a depot; such that each node is visited justSolving the Capacitated Vehicle Routing Problem and the Split Delivery using GRASP Metaheuristic Joseph Gallart Suárez1 , Manuel Tupia Anticona1 1 Engineering department, Pontificia Universidad Católica

Paris-Sud XI, Université de

249

Exciton splitting and carrier transport across the amorphous-silicon/ polymer solar cell interface  

E-Print Network (OSTI)

of bilayer hybrid solar cells to better understand the physics controlling organic-inorganic device of Physics. DOI: 10.1063/1.2408641 Hybrid organic-inorganic solar cells combine the pro- cessabilityExciton splitting and carrier transport across the amorphous-silicon/ polymer solar cell interface

McGehee, Michael

250

DOE NSF Partnership to Address Critical Challenges in Hydrogen Production from Solar Water Splitting  

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

EERE and the National Science Foundation (NSF) announce a funding opportunity in the area of renewable hydrogen technology research and development, specifically addressing discovery and development of advanced materials systems and chemical proceesses for direct photochemical and/or thermochemical water splitting for application in the solar production of hydrogen fuel.

251

An Autoinhibited Coiled-Coil Design Strategy for Split-Protein Protease Sensors  

E-Print Network (OSTI)

An Autoinhibited Coiled-Coil Design Strategy for Split-Protein Protease Sensors Sujan S. Shekhawat protease sensor geometry that allows for the use of these turn-on sensors as potential AND logic gates encoded turn-on protease sensors while also providing a general autoinhibited coiled-coil strategy

Ghosh, Indraneel

252

An Autoinhibited Coiled-Coil Design Strategy for Split-Protein Protease Sensors  

E-Print Network (OSTI)

S1 An Autoinhibited Coiled-Coil Design Strategy for Split-Protein Protease Sensors Sujan S with singly inhibited coiled-coil protease sensor. Figure S4: TEV protease cleavage studies utilizing 35: Model for alternative assemblies of singly inhibited coiled-coil sensors. Figure S7: Model

Ghosh, Indraneel

253

A perfectly matched layer formulation for the nonlinear shallow water equations models: The split  

E-Print Network (OSTI)

In a limited-area numerical weather prediction model, the lateral boundaries are not physical boundaries interest since the early days of numerical weather prediction. Several good reviews are availableA perfectly matched layer formulation for the nonlinear shallow water equations models: The split

Navon, Michael

254

The Classification of Heegaard Splittings for (Compact Orient Able Surface) x S1  

Science Journals Connector (OSTI)

......F', F" analogously to F*, F. Then M - (F1 )* has two components, the closures of which are C, and C, where C = C2U...UCn. Moreover, the closures of the com- ponents of C - (F")* are C2,..., Cn. The induced Heegaard splitting......

Jennifer Schultens

1993-09-01T23:59:59.000Z

255

Characterization of the nitrogen split interstitial defect in wurtzite aluminum nitride using density functional theory  

SciTech Connect

We carried out Heyd-Scuseria-Ernzerhof hybrid density functional theory plane wave supercell calculations in wurtzite aluminum nitride in order to characterize the geometry, formation energies, transition levels, and hyperfine tensors of the nitrogen split interstitial defect. The calculated hyperfine tensors may provide useful fingerprint of this defect for electron paramagnetic resonance measurement.

Szállás, A., E-mail: szallas.attila@wigner.mta.hu [Institute for Solid State Physics and Optics, Wigner Research Centre for Physics, Hungarian Academy of Sciences, P.O. Box 49, H-1525 Budapest (Hungary); Szász, K. [Institute for Solid State Physics and Optics, Wigner Research Centre for Physics, Hungarian Academy of Sciences, P.O. Box 49, H-1525 Budapest (Hungary); Institute of Physics, Eötvös University, Pázmány Péter sétány 1/A, H-1117 Budapest (Hungary); Trinh, X. T.; Son, N. T.; Janzén, E. [Department of Physics, Chemistry and Biology, Linköping University, SE-581 83 Linköping (Sweden); Gali, A., E-mail: gali.adam@wigner.mta.hu [Institute for Solid State Physics and Optics, Wigner Research Centre for Physics, Hungarian Academy of Sciences, P.O. Box 49, H-1525 Budapest (Hungary); Department of Atomic Physics, Budapest University of Technology and Economics, Budafoki út 8, H-1111 Budapest (Hungary)

2014-09-21T23:59:59.000Z

256

Amorphous FeOOH Oxygen Evolution Reaction Catalyst for Photoelectrochemical Water Splitting  

E-Print Network (OSTI)

to produce H2 for industrial use. Currently steam reformation of natural gas, which generates CO2 (PEC) water splitting will likely require the combination of efficient solar absorbers with high, the a-FeOOH thin films absorb less than 3% of the solar photons (AM1.5G) with energy greater than 1.9 e

Lin, Jung-Fu "Afu"

257

Energy management of power-split plug-in hybrid electric vehicles based on simulated annealing and Pontryagin's minimum principle  

E-Print Network (OSTI)

Energy management of power-split plug-in hybrid electric vehicles based on simulated annealing management method is proposed for a power-split plug-in hybrid electric vehicle (PHEV). Through analyzing and hybrid driving mode. During the pure electric driving mode, the vehicle is only powered by the battery

Mi, Chunting "Chris"

258

Overall photocatalytic water splitting with NiOxSrTiO3 a revised Troy K. Townsend,a  

E-Print Network (OSTI)

catalysts assumes water oxidation to occur at the early transition metal oxide and water reduction at NiOx­La : KTaO3, and many layered perovskites. Introduction Splitting water into hydrogen and oxygen gas usingOverall photocatalytic water splitting with NiOx­SrTiO3 ­ a revised mechanism Troy K. Townsend

Osterloh, Frank

259

A Split-Foundry Asynchronous FPGA Benjamin Hill, Robert Karmazin, Carlos Tadeo Ortega Otero, Jonathan Tse, and Rajit Manohar  

E-Print Network (OSTI)

manufacturing introduces additional complexity to the design process, such as FEOL/BEOL mask alignment the risks to IP or reducing production costs [4,5]. Split manufacturing separates a design into Front End foundry performs FEOL manufacturing, then ships wafers to a trusted foundry for BEOL fabrication. Split

Manohar, Rajit

260

Comparison of microearthquake locations using seismic interferometry principles  

E-Print Network (OSTI)

Mapping, localization, and general characterization of problems in reservoir fracture systems is one of the most important in oil, gas, and geothermal energy production. One way to study and monitor these fracture systems ...

Melo, Gabriela

2012-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "microearthquake shear-wave splitting" 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

Microearthquake surveys of Snake River plain and Northwest Basin...  

Open Energy Info (EERE)

Black Rock Desert; Cassia County Idaho; earthquakes; economic geology; exploration; fracture zones; geophysical methods; geophysical surveys; geothermal energy; Humboldt County...

262

Micro-Earthquake At Waunita Hot Springs Geothermal Area (Lange...  

Open Energy Info (EERE)

was to assess the extent of active fault failure and the potential importance of fracture permeability in the subsurface surrounding the hot springs. Notes The first...

263

Micro-Earthquake At Roosevelt Hot Springs Geothermal Area (Ward...  

Open Energy Info (EERE)

Area. References S. H. Ward, W. T. Parry, W. P. Nash, W. R. Sill, K. L. Cook, R. B. Smith, D. S. Chapman, F. H. Brown, J. A. Whelan, J. R. Bowman (1978) A Summary of the...

264

Micro-Earthquake At Neal Hot Springs Geothermal Area (Nichols...  

Open Energy Info (EERE)

seismic sensor, a data acquisition system that records information onto flash drives, a solar panel and battery, and a fence to keep cows out. References Scott Nichols, David...

265

Ductless Heat Pumps "Mini-splits" in PNW Cold and Marine Climates  

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

Pumps "mini-splits" in PNW Pumps "mini-splits" in PNW Cold and Marine Climates David Hales, Michael Lubliner, Luke Howard WSU Energy Program- Olympia, WA Presented at USDOE Building America Meeting Austin, TX - March 2012 Acknowledgments * USDOE BA-PIRC (Eric Martin) * Northwest Energy Efficiency Alliance (David Cohen) * Ecotope Inc. (David Baylon, Ben Larsen, Bob Davis) * The Heat Pump Store (Jeff Pratt) * Bonneville Power Administration (BPA/EPRI) * PNNL (Subrato Chandra) Overview of Presentation * NEEA/BPA funded research - Hales/Ecotope - Utility Billing Analysis - Field Monitoring - HVAC Lab Testing * WSU case study of deep energy retrofit w/DHP - Howard * BA/WSU case study of DHP in HUD-code retrofit - Lubliner

266

Distributed Reforming of Renewable Liquids via Water Splitting using Oxygen Transport Membrane (OTM) (Presentation)  

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

Reforming of Renewable Reforming of Renewable Liquids via Water Splitting using Oxygen Transport Membrane (OTM) * U. (Balu) Balachandran, T. H. Lee, C. Y. Park, and S. E. Dorris Energy Systems Division E-mail: balu@anl.gov * Work supported by the Hydrogen, Fuel Cells, and Infrastructure Technologies Program of DOE's Office of Energy Efficiency and Renewable Energy Presented at the Bio-derived Liquids Working Group (BILIWG) Meeting, Nov. 6, 2007. BILIWG Meeting, Nov. 6, 2007 2 Objective & Rationale Objective: Develop compact dense ceramic membrane reactors that enable the efficient and cost-effective production of hydrogen by reforming renewable liquid fuels using pure oxygen produced by water splitting and transported by an OTM. Rationale: Membrane technology provides the means to attack barriers to the

267

Titanium and Magnesium Co-Alloyed Hematite Thin Films for Photoelectrochemical Water Splitting  

SciTech Connect

Using a combination of density functional theory calculation and materials synthesis and characterization we examine the properties of charge-compensated Ti and Mg co-alloyed hematite thin films for the application of photoelectrochemical (PEC) water splitting. We find that the charge-compensated co-alloying results in the following effects: (1) It enhances the solubility of Mg and Ti, which leads to reduced electron effective mass and therefore increased electron mobility; (2) It tunes the carrier density and therefore allows the optimization of electrical conductivity; and (3) It reduces the density of charged defects and therefore reduces carrier recombination. As a result, the Ti and Mg co-alloyed hematite thin films exhibit improved water oxidation photocurrent magnitudes as compared to pure hematite thin films. Our results suggest that charge-compensated co-alloying is a plausible approach for engineering hematite for the application of PEC water splitting.

Tang, H.; Yin, W. J.; Matin, M. A.; Wang, H.; Deutsch, T.; Al-Jassim, M. M.; Turner, J. A.; Yan, Y.

2012-04-01T23:59:59.000Z

268

Tuning Fermilab Heavy Quarks in 2+1 Flavor Lattice QCD with Application to Hyperfine Splittings  

E-Print Network (OSTI)

We report the non-perturbative tuning of parameters--- kappa_c, kappa_b, and kappa_crit ---that determine the heavy-quark mass in the Fermilab action. This requires the computation of the masses of Ds^(*) and Bs^(*) mesons comprised of a Fermilab heavy quark and a staggered light quark. Additionally, we report the hyperfine splittings for Ds and Bs mesons as a cross-check of our simulation and analysis methods. We find a splitting of 145 +/- 15 MeV for the Ds system and 40 +/- 9 MeV for the Bs system. These are in good agreement with the Particle Data Group average values of 143.9 +/- 0.4 MeV and 46.1 +/- 1.5 MeV, respectively. The calculations are carried out with the MILC 2+1 flavor gauge configurations at three lattice spacings $a$ approximately 0.15, 0.12, and 0.09 fm.

C. Bernard; C. DeTar; M. Di Pierro; A. X. El-Khadra; R. T. Evans; E. D. Freeland; E. Gámiz; Steven Gottlieb; U. M. Heller; J. E. Hetrick; A. S. Kronfeld; J. Laiho; L. Levkova; P. B. Mackenzie; J. N. Simone; R. Sugar; D. Toussaint; R. S. Van de Water

2011-02-22T23:59:59.000Z

269

Calculation of the Energy Band Diagram of a Photoelectrochemical Water Splitting Cell  

Science Journals Connector (OSTI)

Calculation of the Energy Band Diagram of a Photoelectrochemical Water Splitting Cell ... The model is based on the continuity equations for charge carriers and direct charge transfer from the energy bands to the electrolyte. ... A quantitative calculation of the position of the energy bands and the variation of the quasi-Fermi levels in the semiconductor with respect to the water reduction and oxidation potentials are presented. ...

Peter Cendula; S. David Tilley; Sixto Gimenez; Juan Bisquert; Matthias Schmid; Michael Grätzel; Jürgen O. Schumacher

2014-11-16T23:59:59.000Z

270

Exchange-induced splitting of exciton energy levels in quantum wires  

Science Journals Connector (OSTI)

Effects of the electron-hole exchange interaction on excitons in one-dimensional quantum wires are studied theoretically by performing a simplified calculation with a scaling argument. It is shown that the exchange parameters are drastically enhanced in narrow quantum wires compared to the bulk values. As expected, the variation of the exchange-induced splitting as a function of the wire size has the same qualitative behavior as those in comparable two-dimensional quantum wells but with much higher magnitudes.

Y. Chen

1990-05-15T23:59:59.000Z

271

Calculation of Solar P-mode Oscillation Frequency Splittings Based on a Two-dimensional Solar Model  

E-Print Network (OSTI)

We compute the p-mode oscillation frequencies and frequency splittings that arise in a two-dimensional model of the Sun that contains toroidal magnetic fields in its interior.

Linghuai Li; Sarbani Basu; Sabatino Sofia; Pierre Demarque

2008-10-27T23:59:59.000Z

272

The external magnetic field dependence of RF splitting of57Fe hyperfine lines. NMR + Mössbauer double resonance experiment  

Science Journals Connector (OSTI)

We present the results of an experimental investigation of a RF splitting of57Fe hyperfine lines in the regime of NMR and Mössbauer ... have been performed as a function of RF field intensity and static magnetic

F. G. Vagizov

1995-01-01T23:59:59.000Z

273

InGaN working electrodes with assisted bias generated from GaAs solar cells for efficient water splitting  

Science Journals Connector (OSTI)

Hydrogen generation through water splitting by n-InGaN working electrodes with bias generated from GaAs solar cell was studied. Instead of using an external bias provided by power...

Liu, Shu-Yen; Sheu, J K; Lin, Yu-Chuan; Chen, Yu-Tong; Tu, S J; Lee, M L; Lai, W C

2013-01-01T23:59:59.000Z

274

Effects of system cycling, evaporator airflow, and condenser coil fouling on the performance of residential split-system air conditioners  

E-Print Network (OSTI)

EFFECTS OF SYSTEM CYCLING, EVAPORATOR AIRFLOW, AND CONDENSER COIL FOULING ON THE PERFORMANCE OF RESIDENTIAL SPLIT-SYSTEM AIR CONDITIONERS A Thesis by JEFFREY BRANDON DOOLEY Submitted to the Office of Graduate Studies... COIL FOULING ON THE PERFORMANCE OF RESIDENTIAL SPLIT-SYSTEM AIR CONDITIONERS A Thesis by JEFFREY BRANDON DOOLEY Submitted to Texas A&M University in partial fulfillment of the requirements for the degree of MASTER...

Dooley, Jeffrey Brandon

2005-02-17T23:59:59.000Z

275

Perfect light trapping in nanoscale thickness semiconductor films with resonant back reflector and spectrum-splitting structures  

E-Print Network (OSTI)

The optical absorption of nanoscale thickness semiconductor films on top of light-trapping structures based on optical interference effects combined with spectrum-splitting structures is theoretically investigated. Nearly perfect absorption over a broad spectrum range can be achieved in $solar absorption and low carrier thermalization loss can be achieved when the light-trapping structures with wedge-shaped spacer layer or semiconductor films are combined with spectrum-splitting structures.

Liu, Jiang-Tao; Yang, Wen; Li, Jun

2014-01-01T23:59:59.000Z

276

Impacts of urban transportation mode split on CO{sub 2} emissions in Jinan, China.  

SciTech Connect

As the world's largest developing country, China currently is undergoing rapid urbanization and motorization, which will result in far-reaching impacts on energy and the environment. According to estimates, energy use and carbon emissions in the transportation sector will comprise roughly 30% of total emissions by 2030. Since the late 1990s, transportation-related issues such as energy, consumption, and carbon emissions have become a policy focus in China. To date, most research and policies have centered on vehicle technologies that promote vehicle efficiency and reduced emissions. Limited research exists on the control of greenhouse gases through mode shifts in urban transportation - in particular, through the promotion of public transit. The purpose of this study is to establish a methodology to analyze carbon emissions from the urban transportation sector at the Chinese city level. By using Jinan, the capital of China's Shandong Province, as an example, we have developed an analytical model to simulate energy consumption and carbon emissions based on the number of trips, the transportation mode split, and the trip distance. This model has enabled us to assess the impacts of the transportation mode split on energy consumption and carbon emissions. Furthermore, this paper reviews a set of methods for data collection, estimation, and processing for situations where statistical data are scarce in China. This paper also describes the simulation of three transportation system development scenarios. The results of this study illustrate that if no policy intervention is implemented for the transportation mode split (the business-as-usual (BAU) case), then emissions from Chinese urban transportation systems will quadruple by 2030. However, a dense, mixed land-use pattern, as well as transportation policies that encourage public transportation, would result in the elimination of 1.93 million tons of carbon emissions - approximately 50% of the BAU scenario emissions.

He, D.; Meng, F.; Wang, M.; He, K. (Energy Systems); (Energy Foundation); (Tsinghua Univ.)

2011-04-01T23:59:59.000Z

277

Gaugino physics of split supersymmetry spectra at the LHC and future proton colliders  

Science Journals Connector (OSTI)

Discovery of the Higgs boson and lack of discovery of superpartners in the first run at the LHC are both predictions of split supersymmetry with thermal dark matter. We discuss what it would take to find gluinos at hadron supercolliders, including the LHC at 14 TeV center-of-mass energy, and future pp colliders at 100 TeV and 200 TeV. We generalize the discussion by reexpressing the search capacity in terms of the gluino to lightest superpartner mass ratio and apply results to other scenarios, such as gauge mediation and mirage mediation.

Sunghoon Jung and James D. Wells

2014-04-02T23:59:59.000Z

278

The effects of the split share structure reform on Chinese listed firms’ leverage decisions  

Science Journals Connector (OSTI)

Abstract This paper examines the effects of China's split share structure reform on the leverage decisions of listed firms. The results show that there are two effects, multiple large shareholders and liquidity that affect the leverage ratio. In non-state controlled firms, multiple large shareholders are able to monitor the controlling shareholders which reduce the leverage ratio. However, in state-controlled firms, they collude with the controlling shareholders to expropriate through debt financing. State ownership plays a decisive role in driving multiple large shareholders to collude with the controlling shareholders.

Han-Fang Tsai; Tsui-Jung Lin; Jung-Hua Hung

2014-01-01T23:59:59.000Z

279

Size quantization in planar graphene-based heterostructures: Pseudospin splitting, interface states, and excitons  

SciTech Connect

A planar quantum-well device made of a gapless graphene nanoribbon with edges in contact with gapped graphene sheets is examined. The size-quantization spectrum of charge carriers in an asymmetric quantum well is shown to exhibit a pseudospin splitting. Interface states of a new type arise from the crossing of dispersion curves of gapless and gapped graphene materials. The exciton spectrum is calculated for a planar graphene quantum well. The effect of an external electric field on the exciton spectrum is analyzed.

Ratnikov, P. V., E-mail: ratnikov@lpi.ru; Silin, A. P. [Russian Academy of Sciences, Lebedev Physical Institute (Russian Federation)

2012-03-15T23:59:59.000Z

280

NREL Documents Efficiency of Mini-Split Heat Pumps (Fact Sheet)  

SciTech Connect

A new report delivers mini-split heat pump (MSHP) performance data for use in whole-building simulation tools. Mini-split heat pumps (MSHPs) are highly efficient refrigerant-based air conditioning and heating systems that permit room-by-room conditioning and control in homes. Because of their size, efficiency, and price, MSHPs are very popular overseas and are gaining market share in energy-efficient home upgrades in the United States. They are a good option for retrofitting older homes that lack ductwork. To evaluate MSHP cost effectiveness and performance in U.S. homes, National Renewable Energy Laboratory (NREL) researchers are studying these systems in the laboratory, simulated buildings, and field test settings. A new NREL report describes an innovative laboratory approach to testing MSHPs and includes experimental performance maps for use in whole-building simulation tools. Most public information on MSHP performance is provided by equipment manufacturers, and is typically limited to performance at a single operating speed for heating and cooling. Mini-split heat pumps use variable speed components that spin up and down to continuously meet the heating or cooling need, significantly improving a system's operating efficiency. Measuring that efficiency in a laboratory is challenging and required new approaches to performance testing. NREL researchers worked with colleagues at Purdue University's Herrick Labs and Ecotope, Inc. to refine and apply this new approach to a suite of MSHP products. Researchers measured the performance of two MSHPs across a variety of operating conditions, which allowed, for the first time, development of accurate building simulation MSHP models. In the laboratory tests, researchers found that both MSHPs achieved manufacturer-reported performance at rating conditions. However, at other temperature and humidity conditions, the heat pumps capacity ranged from 40% above to 54% below the manufacturer-reported values. Knowing how performance varies is critical in order to reasonably estimate annual energy consumption of a MSHP, and to compare MSHPs to other heating and cooling options. Mini-split heat pump efficiency (COP) was seen to significantly exceed rated efficiency at low compressor speeds-a very important effect.

Not Available

2012-06-01T23:59:59.000Z

Note: This page contains sample records for the topic "microearthquake shear-wave splitting" 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

Traveling wave device for combining or splitting symmetric and asymmetric waves  

DOE Patents (OSTI)

A traveling wave device for the combining or splitting of symmetric and asymmetric traveling wave energy includes a feed waveguide for traveling wave energy, the feed waveguide having an input port and a launching port, a reflector for coupling wave energy between the feed waveguide and a final waveguide for the collection and transport of wave energy to or from the reflector. The power combiner has a launching port for symmetrical waves which includes a cylindrical section coaxial to the feed waveguide, and a launching port for asymmetric waves which includes a sawtooth rotated about a central axis.

Möbius, Arnold (Eggenstein, DE); Ives, Robert Lawrence (Saratoga, CA)

2005-07-19T23:59:59.000Z

282

Two-dimensional analysis of the Split-Hopkinson Pressure Bar  

E-Print Network (OSTI)

INSTRUMENTATION The instrumentation used in the Split-Hopkinson Pressure Bar ex- periment is shown in Figure 20. A brief description of the instru- mentation is given in this appendix. A light beam-photodiode system shown in Figure 21 is used to ob- tain... the progectile velocity. This system consists of two stations located on the gun barrel 1. 55 inches apart. Each station has a light bulb which shines into a vent hole through the barrel and into a photodiode on the opposite side of the barrel. In addition...

Sharp, Richard Norton

2012-06-07T23:59:59.000Z

283

Doped, porous iron oxide films and their optical functions and anodic photocurrents for solar water splitting  

SciTech Connect

The fabrication and morphological, optical, and photoelectrochemical characterization of doped iron oxide films is presented. The complex index of refraction and absorption coefficient of polycrystalline films are determined through measurement and modeling of spectral transmission and reflection data using appropriate dispersion relations. Photoelectrochemical characterization for water photo-oxidation reveals that the conversion efficiencies of electrodes are strongly influenced by substrate temperature during their oblique-angle physical vapor deposition. These results are discussed in terms of the films' morphological features and the known optoelectronic limitations of iron oxide films for application in solar water splitting devices.

Kronawitter, Coleman X.; Mao, Samuel S. [Department of Mechanical Engineering, University of California at Berkeley, Berkeley, California 94720, USA and Environmental Energy Technologies Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720 (United States); Antoun, Bonnie R. [Sandia National Laboratories, Livermore, California 94551 (United States)

2011-02-28T23:59:59.000Z

284

A 3D radiative transfer framework: I. non-local operator splitting and continuum scattering problems  

E-Print Network (OSTI)

We describe a highly flexible framework to solve 3D radiation transfer problems in scattering dominated environments based on a long characteristics piece-wise parabolic formal solution and an operator splitting method. We find that the linear systems are efficiently solved with iterative solvers such as Gauss-Seidel and Jordan techniques. We use a sphere-in-a-box test model to compare the 3D results to 1D solutions in order to assess the accuracy of the method. We have implemented the method for static media, however, it can be used to solve problems in the Eulerian-frame for media with low velocity fields.

Peter H. Hauschildt; E. Baron

2006-01-09T23:59:59.000Z

285

Spatial distribution of shear wave anisotropy in the crust of the southern Hyogo region by borehole observations  

Science Journals Connector (OSTI)

......estimate a depth-dependent anisotropic model for each subset. The...or the upper limit of the anisotropic zone for the two clusters...mostly Jurassic sandstone or shale, but some areas have quite...8 Conclusions We obtain anisotropic structure, not only in terms......

Takashi Mizuno; Kiyoshi Yomogida; Hisao Ito; Yasuto Kuwahara

2001-12-01T23:59:59.000Z

286

Spatial distribution of shear wave anisotropy in the crust of the southern Hyogo region by borehole observations  

Science Journals Connector (OSTI)

......resulting in a large apparent intensity...also suggests that borehole waveforms with a...earthquake from a large number of high-quality...in particular borehole data. At stations...the active fault drilling borehole at Nojima Hirabayashi......

Takashi Mizuno; Kiyoshi Yomogida; Hisao Ito; Yasuto Kuwahara

2001-12-01T23:59:59.000Z

287

Characterizing Fractures in the Geysers Geothermal Field by Micro-seismic Data, Using Soft Computing, Fractals, and Shear Wave Anisotropy  

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

Determine if fracturing could be used to enhance permeability; and whether dilution of existing fluids with injected water would lower corrosivity enough to allow economic production of power.

288

High-resolution shear-wave reflection profiling to image offset in unconsolidated near-surface sediments.  

E-Print Network (OSTI)

??S-wave reflection profiling has many theoretical advantages, when compared to P-wave profiling, such as high-resolution potential, greater sensitivities to lithologic changes and insensitivity to the… (more)

Bailey, Bevin

2014-01-01T23:59:59.000Z

289

Charge transport through split photoelectrodes in dye-sensitized solar cells  

SciTech Connect

Charge transport and recombination are relatively ignored parameters while upscaling dye-sensitized solar cells (DSCs). Enhanced photovoltaic parameters are anticipated by merely widening the devices physical dimensions, viz., thickness and area as evident from the device design adopted in reported large area DSCs. These strip designs lead to ?50% loss in photocurrent compared to the high efficiency lab scale devices. Herein, we report that the key to achieving higher current density (J{sub SC}) is optimized diffusion volume rather than the increased photoelectrode area because kinetics of the devices is strongly influenced by the varied choices of diffusion pathways upon increasing the electrode area. For a given electrode area and thickness, we altered the photoelectrode design by splitting the electrode into multiple fractions to restrict the electron diffusion pathways. We observed a correlation between the device physical dimensions and its charge collection efficiency via current-voltage and impedance spectroscopy measurements. The modified electrode designs showed >50% increased J{sub SC} due to shorter transport time, higher recombination resistance and enhanced charge collection efficiency compared to the conventional ones despite their similar active volume (?3.36?×?10{sup ?4}?cm{sup 3}). A detailed charge transport characteristic of the split devices and their comparison with single electrode configuration is described in this article.

Fakharuddin, Azhar; Ahmed, Irfan; Yusoff, Mashitah M.; Jose, Rajan, E-mail: rjose@ump.edu.my [Nanostructured Renewable Energy Materials Laboratory, Faculty of Industrial Sciences and Technology, Universiti Malaysia Pahang, Kuantan 26300 (Malaysia); Khalidin, Zulkeflee [Faculty of Electrical and Electronics Engineering, Universiti Malaysia Pahang, Kuantan 26600 (Malaysia)

2014-04-28T23:59:59.000Z

290

Constraining Proton Lifetime in SO(10) with Stabilized Doublet-Triplet Splitting  

SciTech Connect

We present a class of realistic unified models based on supersymmetric SO(10) wherein issues related to natural doublet-triplet (DT) splitting are fully resolved. Using a minimal set of low dimensional Higgs fields which includes a single adjoint, we show that the Dimopoulos-Wilzcek mechanism for DT splitting can be made stable in the presence of all higher order operators without having pseudo-Goldstone bosons and flat directions. The {mu} term of order TeV is found to be naturally induced. A Z{sub 2}-assisted anomalous U(1){sub A} gauge symmetry plays a crucial role in achieving these results. The threshold corrections to {alpha}{sub 3}(M{sub Z}), somewhat surprisingly, are found to be controlled by only a few effective parameters. This leads to a very predictive scenario for proton decay. As a novel feature, we find an interesting correlation between the d = 6 (p {yields} e{sup +}{pi}{sup 0}) and d = 5 (p {yields} {bar {nu}}K{sup +}) decay amplitudes which allows us to derive a constrained upper limit on the inverse rate of the e{sup +}{pi}{sup 0} mode. Our results show that both modes should be observed with an improvement in the current sensitivity by about a factor of five to ten.

Babu, K.S.; /Oklahoma State U.; Pati, Jogesh C.; /SLAC; Tavartkiladze, Zurab; /Oklahoma State U. /Tbilisi, Inst. Phys.

2011-06-28T23:59:59.000Z

291

Sunlight-Driven Hydrogen Formation by Membrane-Supported Photoelectrochemical Water Splitting  

SciTech Connect

This report describes the significant advances in the development of the polymer-supported photoelectrochemical water-splitting system that was proposed under DOE grant number DE-FG02-05ER15754. We developed Si microwire-array photoelectrodes, demonstrated control over the material and light-absorption properties of the microwire-array photoelectrodes, developed inexpensive processes for synthesizing the arrays, and doped the arrays p-type for use as photocathodes. We also developed techniques for depositing metal-nanoparticle catalysts of the hydrogen-evolution reaction (HER) on the wire arrays, investigated the stability and catalytic performance of the nanoparticles, and demonstrated that Ni-Mo alloys are promising earth-abundant catalysts of the HER. We also developed methods that allow reuse of the single-crystalline Si substrates used for microwire growth and methods of embedding the microwire photocathodes in plastic to enable large-scale processing and deployment of the technology. Furthermore we developed techniques for controlling the structure of WO3 films, and demonstrated that structural control can improve the quantum yield of photoanodes. Thus, by the conclusion of this project, we demonstrated significant advances in the development of all components of a sunlight-driven membrane-supported photoelectrochemical water-splitting system. This final report provides descriptions of some of the scientific accomplishments that were achieved under the support of this project and also provides references to the peer-reviewed publications that resulted from this effort.

Lewis, Nathan S. [California Institute of Technology] [California Institute of Technology

2014-03-26T23:59:59.000Z

292

Final environmental statement related to the Western Nuclear, Inc. , Split Rock Uranium Mill (Fremont County, Wyoming)  

SciTech Connect

The proposed action is the renewal of Source Material License SUA-56 (with amendments) issued to Western Nuclear, Inc. (WNI), for the operation of the Split Rock Uranium Mill near Jeffrey City and the Green Mountain Ion-Exchange Facility, both in Fremont County, Wyoming. The license also permits possession of material from past operations at four ancillary facilities in the Gas Hills mining area - the Bullrush, Day-Loma, Frazier-Lamac, and Rox sites (Docket No. 40-1162). However, although heap leaching operations were previously authorized at Frazier-Lamac, there has never been any processing of material at this site. The Split Rock mill is an acid-leach, ion-exchange and solvent-extraction uranium-ore processing mill with a design capacity of 1540 MT (1700 tons) of ore per day. WNI has proposed by license amendment request to increase the storage capacity of the tailings ponds in order to permit the continuation of present production rates of U/sub 3/O/sub 8/ through 1996 using lower-grade ores.

Not Available

1980-02-01T23:59:59.000Z

293

Scaling of distributions of sums of positions for chaotic dynamics at band-splitting points  

E-Print Network (OSTI)

The stationary distributions of sums of positions of trajectories generated by the logistic map have been found to follow a basic renormalization group (RG) structure: a nontrivial fixed-point multi-scale distribution at the period-doubling onset of chaos and a Gaussian trivial fixed-point distribution for all chaotic attractors. Here we describe in detail the crossover distributions that can be generated at chaotic band-splitting points that mediate between the aforementioned fixed-point distributions. Self affinity in the chaotic region imprints scaling features to the crossover distributions along the sequence of band splitting points. The trajectories that give rise to these distributions are governed first by the sequential formation of phase-space gaps when, initially uniformly-distributed, sets of trajectories evolve towards the chaotic band attractors. Subsequently, the summation of positions of trajectories already within the chaotic bands closes those gaps. The possible shapes of the resultant distributions depend crucially on the disposal of sets of early positions in the sums and the stoppage of the number of terms retained in them.

Alvaro Diaz-Ruelas; Miguel Angel Fuentes; Alberto Robledo

2014-09-26T23:59:59.000Z

294

Laboratory Test Report for Fujitsu 12RLS and Mitsubishi FE12NA Mini-Split Heat Pumps  

SciTech Connect

Mini-split heat pumps are being proposed as a new retrofit option to replace resistance heating in the Pacific Northwest. NREL has previously developed a field test protocol for mini-split systems to ensure consistent results from field tests. This report focuses on the development of detailed system performance maps for mini-split heat pumps so that the potential benefits of mini-split systems can be accurately analyzed for different climate regions and housing types. This report presents laboratory test results for two mini-split heat pumps. Steady-state heating and cooling performance for the Fujitsu 12RLS and Mitsubishi FE12NA was tested under a wide range of outdoor and indoor temperatures at various compressor and fan speeds. Cycling performance for each unit was also tested under both modes of operation. Both systems performed quite well under low loads and the experimental test data aligned with manufacturer reported values. Adequate datasets were attained to promote performance modeling of these two systems in the future.

Winkler, J.

2011-09-01T23:59:59.000Z

295

Seismic diagnostics for transport of angular momentum in stars 1. Rotational splittings from the PMS to the RGB  

E-Print Network (OSTI)

Rotational splittings are currently measured for several main sequence stars and a large number of red giants with the space mission Kepler. This will provide stringent constraints on rotation profiles. Our aim is to obtain seismic constraints on the internal transport and surface loss of angular momentum of oscillating solar-like stars. To this end, we study the evolution of rotational splittings from the pre-main sequence to the red-giant branch for stochastically excited oscillation modes. We modified the evolutionary code CESAM2K to take rotationally induced transport in radiative zones into account. Linear rotational splittings were computed for a sequence of $1.3 M_{\\odot}$ models. Rotation profiles were derived from our evolutionary models and eigenfunctions from linear adiabatic oscillation calculations. We find that transport by meridional circulation and shear turbulence yields far too high a core rotation rate for red-giant models compared with recent seismic observations. We discuss several uncert...

Marques, J P; Lebreton, Y; Talon, S; Palacios, A; Belkacem, K; Ouazzani, R -M; Mosser, B; Moya, A; Morel, P; Pichon, B; Mathis, S; Zahn, J -P; Turck-Chièze, S; Nghiem, P A P

2012-01-01T23:59:59.000Z

296

Efficient, sustainable production of molecular hydrogen -a promising alternative to batteries in terms of energy storage -is still an unsolved problem. Implementation of direct water splitting  

E-Print Network (OSTI)

in terms of energy storage - is still an unsolved problem. Implementation of direct water splitting usingEfficient, sustainable production of molecular hydrogen - a promising alternative to batteries

KuÂ?el, Petr

297

Quarkonium mass splittings with Fermilab heavy quarks and 2+1 flavors of improved staggered sea quarks  

E-Print Network (OSTI)

We present results from an ongoing lattice study of the lowest lying charmonium and bottomonium level splittings using the Fermilab heavy quark formalism. Our objective is to test the performance of this action on MILC-collaboration ensembles of (2+1) flavors of light improved staggered (asqtad) quarks. Measurements are done on 16 ensembles with degenerate up and down quarks of various masses, thus permitting a chiral extrapolation, and over lattice spacings ranging from 0.09 fm to 0.18 fm, thus permitting study of lattice-spacing dependence. We examine combinations of the mass splittings that are sensitive to components of the effective quarkonium potential.

T. Burch; C. E. DeTar; M. Di Pierro; A. X. El-Khadra; Steven Gottlieb; A. S. Kronfeld; L. Levkova; P. B. Mackenzie; J. Simone

2009-11-02T23:59:59.000Z

298

Making a Magnetic Moment in a Split Picosecond | Advanced Photon Source  

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

Unpeeling Atoms and Molecules from the Inside Out Unpeeling Atoms and Molecules from the Inside Out Butterfly Wing Yields Clues to Light-Altering Structures Squeezing Information from Materials under Extreme Pressure Quick-Change Molecules Caught in the Act The Molecular Mechanics of Hearing and Deafness Science Highlights Archives: 2013 | 2012 | 2011 | 2010 2009 | 2008 | 2007 | 2006 2005 | 2004 | 2003 | 2002 2001 | 2000 | 1998 | Subscribe to APS Science Highlights rss feed Making a Magnetic Moment in a Split Picosecond JULY 1, 2010 Bookmark and Share Michel van Veenendaal (left) and Jun Chang in van Veenendaal's office at the APS, discussing figure 3 from their Physical Review Letters article, "Model of Ultrafast Intersystem Crossing in Photoexcited Transition-Metal Organic Compounds." A wide range of phenomena in nature and technology depend on changes that

299

Split-quaternionic Hopf map, quantum Hall effect, and twistor theory  

SciTech Connect

Introducing a noncompact version of the Hopf map, we demonstrate remarkable close relations between quantum Hall effect and twistor theory. We first construct quantum Hall effect on a hyperboloid based on the noncompact 2nd Hopf map of split-quaternions. We analyze a hyperbolic one-particle mechanics, and explore many-body problem, where a many-body ground state wave function and membrane-like excitations are derived explicitly. In the lowest Landau level, the symmetry is enhanced from SO(3,2) to the SU(2,2) conformal symmetry. We point out that the quantum Hall effect naturally realizes the philosophy of twistor theory. In particular, emergence mechanism of fuzzy space-time is discussed somehow in detail.

Hasebe, Kazuki [Department of General Education, Kagawa National College of Technology, Takuma-cho, Mitoyo-city, Kagawa 769-1192 (Japan)

2010-02-15T23:59:59.000Z

300

Long-Term Monitoring of Mini-Split Ductless Heat Pumps in the Northeast  

SciTech Connect

Transformations, Inc. has extensive experience building their high performance housing at a variety of Massachusetts locations, in both a production and custom home setting. The majority of their construction uses mini-split heat pumps (MSHPs) for space conditioning. This research covered the long-term performance of MSHPs in Zone 5A; it is the culmination of up to three years' worth of monitoring in a set of eight houses. This research examined electricity use of MSHPs, distributions of interior temperatures and humidity when using simplified (two-point) heating systems in high performance housing, and the impact of door open/closed status on temperature distributions. The use of simplified space conditioning distribution (MSHPs) provides significant first cost savings, which are used to offset the increased investment in the building enclosure.

Ueno, K.; Loomis, H.

2014-11-01T23:59:59.000Z

Note: This page contains sample records for the topic "microearthquake shear-wave splitting" 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

First-principles thermodynamic screening approach to photo-catalytic water splitting with co-catalysts  

SciTech Connect

We adapt the computational hydrogen electrode approach to explicitly account for photo-generated charges and use it to computationally screen for viable catalyst/co-catalyst combinations for photo-catalytic water splitting. The hole energy necessary to thermodynamically drive the reaction is employed as descriptor for the screening process. Using this protocol and hybrid-level density-functional theory, we show that water oxidation on bare TiO{sub 2} surfaces is thermodynamically more complex than previously thought. This motivates a screening for suitable co-catalysts for this half-reaction, which we carry out for Au particles down to the non-scalable size regime. We find that almost all small Au clusters studied are better suited for water photo-oxidation than an extended Au(111) surface or bare TiO{sub 2} facets.

Oberhofer, Harald; Reuter, Karsten [Department Chemie, Technische Universität München, Lichtenbergstr. 4, D-85747 Garching (Germany)] [Department Chemie, Technische Universität München, Lichtenbergstr. 4, D-85747 Garching (Germany)

2013-07-28T23:59:59.000Z

302

Exciton splitting and carrier transport across the amorphous-silicon/polymer solar cell interface  

Science Journals Connector (OSTI)

The authors study exciton splitting at the interface of bilayer hybridsolar cells to better understand the physics controlling organic-inorganicdevice performance. Hydrogenated amorphous silicon ( a - Si : H ) ? poly ( 3 - hexylthiophene ) (P3HT) and a - Si : H ? poly ( 2 - methoxy - 5 - ( 2 ? - ethyl - hexyloxy ) - 1 4 - phenylenevinylene ) (MEH-PPV) solar cells show photoresponse dominated by exciton production in the polymer. The a - Si : H ? P 3 HT devices are nearly as efficient as titania/P3HT cells. However the a - Si : H ? MEH - PPV system has much lower photocurrent than a - Si : H ? P 3 HT likely due to inefficient hole transfer back to the MEH-PPV after energy transfer from MEH-PPV to a - Si : H .

Vignesh Gowrishankar; Shawn R. Scully; Michael D. McGehee; Qi Wang; Howard M. Branz

2006-01-01T23:59:59.000Z

303

A Fully Integrated Nanosystem of Semiconductor Nanowires for Direct Solar Water Splitting  

SciTech Connect

Artificial photosynthesis, the biomimetic approach to converting sunlight?s energy directly into chemical fuels, aims to imitate nature by using an integrated system of nanostructures, each of which plays a specific role in the sunlight-to-fuel conversion process. Here we describe a fully integrated system of nanoscale photoelectrodes assembled from inorganic nanowires for direct solar water splitting. Similar to the photosynthetic system in a chloroplast, the artificial photosynthetic system comprises two semiconductor light absorbers with large surface area, an interfacial layer for charge transport, and spatially separated cocatalysts to facilitate the water reduction and oxidation. Under simulated sunlight, a 0.12percent solar-to-fuel conversion efficiency is achieved, which is comparable to that of natural photosynthesis. The result demonstrates the possibility of integrating material components into a functional system that mimics the nanoscopic integration in chloroplasts. It also provides a conceptual blueprint of modular design that allows incorporation of newly discovered components for improved performance.

Liu, Chong; Tang, Jinyao; Chen, HaoMing; Liu, Bin; Yang, Peidong

2013-02-21T23:59:59.000Z

304

Effects of Doppler broadening on Autler-Townes splitting in six-wave mixing  

SciTech Connect

The effects of Doppler broadening on Autler-Townes (AT) splitting in six-wave mixing (SWM) are investigated by the dressed-state model. We analyze the velocities at which the atoms are in resonance with the dressed states through Doppler frequency shifting and find that, depending on the wave-number ratio, there may be two resonant velocities which can originate from resonance with one of the dressed states or from resonance with two different dressed states. Based on this model, we discuss a novel type of AT doublet in the SWM spectrum, where macroscopic effects play an important role. Specifically, the existence of resonant peaks requires polarization interference between atoms of different velocities in addition to a change in the number of resonant atoms involved. Our model can also be employed to analyze electromagnetically induced transparency resonance and other types of Doppler-free high-resolution AT spectroscopy.

Niu Jinyan [Laboratory of Optical Physics, Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190 (China); School of Mathematics, Physics and Biological Engineering, Inner Mongolia University of Science and Technology, Baotou 014010 (China); Pei Liya; Lu Xiaogang; Wang Ruquan; Wu Lingan; Fu Panming [Laboratory of Optical Physics, Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190 (China)

2011-09-15T23:59:59.000Z

305

Isospin splitting of nucleon effective mass and shear viscosity of nuclear matter  

E-Print Network (OSTI)

Based on an improved isospin- and momentum-dependent interaction, we have studied the qualitative effect of isospin splitting of nucleon effective mass on the specific shear viscosity of neutron-rich nuclear matter from a relaxation time approach. It is seen that for $m_n^\\star>m_p^\\star$, the relaxation time of neutrons is smaller and the neutron flux between flow layers is weaker, leading to a smaller specific shear viscosity of neutron-rich matter compared to the case for $m_n^\\starnuclear matter at higher densities, lower temperatures, and larger isospin asymmetries, but it doesn't affect much the behavior of the specific shear viscosity near nuclear liquid-gas phase transition.

Xu, Jun

2015-01-01T23:59:59.000Z

306

ULTRASOUND PULSE-ECHO IMAGING USING THE SPLIT-STEP FOURIER PROPAGATOR  

SciTech Connect

Ultrasonic reflection imaging has the potential to produce higher image resolution than transmission tomography, but imaging resolution and quality still need to be further improved for early cancer detection and diagnosis. We present an ultrasound reflection image reconstruction method using the split-step Fourier propagator. It is based on recursive inward continuation of ultrasonic wavefields in the frequency-space and frequency-wavenumber domains. The inward continuation within each extrapolation interval consists of two steps. In the first step, a phase-shift term is applied to the data in the frequency-wavenumber domain for propagation in a reference medium. The second step consists of applying another phase-shift term to data in the frequency-space domain to approximately compensate for ultrasonic scattering effects of heterogeneities within the breast. We use synthetic ultrasound pulse-echo data recorded around a ring for heterogeneous, computer-generated numerical breast phantoms to study the imaging capability of the method. The phantoms are derived from an experimental breast phantom and a sound-speed tomography image of an in-vivo ultrasound breast data collected usi ng a ring array. The heterogeneous sound-speed models used for pulse-echo imaging are obtained using a computationally efficient, first-arrival-time (time-of-flight) transmission tomography method. Our studies demonstrate that reflection image reconstruction using the split-step Fourier propagator with heterogeneous sound-speed models significantly improves image quality and resolution. We also numerically verify the spatial sampling criterion of wavefields for a ring transducer array.

HUANG, LIANJIE [Los Alamos National Laboratory; QUAN, YOULI [Los Alamos National Laboratory

2007-01-31T23:59:59.000Z

307

Distinctive upper mantle anisotropy beneath the High Lava Plains and Eastern Snake River Plain,  

E-Print Network (OSTI)

Distinctive upper mantle anisotropy beneath the High Lava Plains and Eastern Snake River Plain and continuing with the still- ongoing volcanism in the High Lava Plains (HLP) and eastern Snake River Plain (SRP waves; shear wave splitting; high lava plains; Snake River Plain; Yellowstone. Index Terms: 8137

308

Deterministic splitting of fluid volumes in electrowetting microfluidics{ Ananda Banerjee, Yuguang Liu, Jason Heikenfeld and Ian Papautsky*  

E-Print Network (OSTI)

Deterministic splitting of fluid volumes in electrowetting microfluidics{ Ananda Banerjee, Yuguang.1039/c2lc40723j Conventional droplet generation approaches in digital microfluidics show ~10% variation, is possible in electrowetting devices. The approach can be easily extended to existing digital microfluidic

Heikenfeld, Jason

309

Diversity in Genetic In Vivo Methods for Protein-Protein Interaction Studies: from the Yeast Two-Hybrid System to the Mammalian Split-Luciferase System  

Science Journals Connector (OSTI)

...GFP with either the C-terminal region of CFP or a mutated V163A version of the GFP C-terminal...polypeptides was detected with split GFP, split CFP, and a combination of GFP and YFP fragments...interactions in living cells. Anal. Chem. 77 :4815-4820. 351. Kodama, Y . 2011. A bright...

Bram Stynen; Hélène Tournu; Jan Tavernier; Patrick Van Dijck

2012-06-01T23:59:59.000Z

310

The effect of spin-orbit splitting on the association kinetics of barrierless halogen atom-hydrocarbon radical reactions.  

SciTech Connect

The effect of the geometry dependence of spin-orbit splitting on transition state theory (TST) predictions for radical-radical recombination rate coefficients is examined. The effects are illustrated with direct ab initio variable-reaction-coordinate (VRC)-TST calculations for the reactions of two types of hydrocarbon radicals (R = CH{sub 3} and CH{sub 2}CHCH{sub 2}) with three halogen atoms (X = F, Cl, and Br). These halogen atoms exhibit a range of spin-orbit interaction strengths, while their interactions with the two hydrocarbon radicals exhibit a range of attractiveness. The transition state dividing surfaces for these barrierless reactions occur over a range of R-X fragment separations ({approx}3-7 {angstrom}) where the magnitude of the spin-orbit splitting is strongly geometry dependent. Perturbative models for incorporating the energetic effect of spin-orbit splitting into barrierless kinetics are presented and tested. Simply neglecting the variation in the spin-orbit splitting is demonstrated to contribute an error of less than 15% to the predicted rate coefficients for all but the CH{sub 2}CHCH{sub 2} + Br reaction, where its neglect increases the rate by up to a factor of 2. For the CH{sub 2}CHCH{sub 2} + Br reaction, the effect of spin-orbit splitting is not perturbative and instead qualitatively changes the long-range interaction potential and association dynamics. The present theoretical predictions are compared with available experimental measurements and previous theoretical work. For the CH{sub 3} + F association reaction, the errors associated with limitations in the basis set and in the active space are studied, and a detailed comparison is made between VRC-TST and rigid rotor-harmonic oscillator variational TST.

Jasper, A. W.; Klippenstein, S. J.; Harding, L. B. (Chemical Sciences and Engineering Division); (SNL)

2010-01-01T23:59:59.000Z

311

Diverse and tunable electronic structures of single-layer metal phosphorus trichalcogenides for photocatalytic water splitting  

SciTech Connect

The family of bulk metal phosphorus trichalcogenides (APX{sub 3}, A = M{sup II}, M{sub 0.5}{sup I}M{sub 0.5}{sup III}; X = S, Se; M{sup I}, M{sup II}, and M{sup III} represent Group-I, Group-II, and Group-III metals, respectively) has attracted great attentions because such materials not only own magnetic and ferroelectric properties, but also exhibit excellent properties in hydrogen storage and lithium battery because of the layered structures. Many layered materials have been exfoliated into two-dimensional (2D) materials, and they show distinct electronic properties compared with their bulks. Here we present a systematical study of single-layer metal phosphorus trichalcogenides by density functional theory calculations. The results show that the single layer metal phosphorus trichalcogenides have very low formation energies, which indicates that the exfoliation of single layer APX{sub 3} should not be difficult. The family of single layer metal phosphorus trichalcogenides exhibits a large range of band gaps from 1.77 to 3.94 eV, and the electronic structures are greatly affected by the metal or the chalcogenide atoms. The calculated band edges of metal phosphorus trichalcogenides further reveal that single-layer ZnPSe{sub 3}, CdPSe{sub 3}, Ag{sub 0.5}Sc{sub 0.5}PSe{sub 3}, and Ag{sub 0.5}In{sub 0.5}PX{sub 3} (X = S and Se) have both suitable band gaps for visible-light driving and sufficient over-potentials for water splitting. More fascinatingly, single-layer Ag{sub 0.5}Sc{sub 0.5}PSe{sub 3} is a direct band gap semiconductor, and the calculated optical absorption further convinces that such materials own outstanding properties for light absorption. Such results demonstrate that the single layer metal phosphorus trichalcogenides own high stability, versatile electronic properties, and high optical absorption, thus such materials have great chances to be high efficient photocatalysts for water-splitting.

Liu, Jian [School of Materials Science and Engineering, Hunan University, Changsha 410082, Hunan (China) [School of Materials Science and Engineering, Hunan University, Changsha 410082, Hunan (China); Beijing Computational Science Research Center, Beijing 100084 (China); College of Electrical and Information Engineering, Hunan Institute of Engineering, Xiangtan 411105, Hunan (China); Li, Xi-Bo; Wang, Da; Liu, Li-Min, E-mail: ppeng@hnu.edu.cn, E-mail: limin.liu@csrc.ac.cn [Beijing Computational Science Research Center, Beijing 100084 (China)] [Beijing Computational Science Research Center, Beijing 100084 (China); Lau, Woon-Ming [Beijing Computational Science Research Center, Beijing 100084 (China) [Beijing Computational Science Research Center, Beijing 100084 (China); Chengdu Green Energy and Green Manufacturing Technology R and D Center, Chengdu, Sichuan 610207 (China); Peng, Ping, E-mail: ppeng@hnu.edu.cn, E-mail: limin.liu@csrc.ac.cn [School of Materials Science and Engineering, Hunan University, Changsha 410082, Hunan (China)] [School of Materials Science and Engineering, Hunan University, Changsha 410082, Hunan (China)

2014-02-07T23:59:59.000Z

312

High Efficiency Generation of Hydrogen Fuels Using Solar Thermochemical Splitting of Water  

SciTech Connect

The objective of this work is to identify economically feasible concepts for the production of hydrogen from water using solar energy. The ultimate project objective was to select one or more competitive concepts for pilot-scale demonstration using concentrated solar energy. Results of pilot scale plant performance would be used as foundation for seeking public and private resources for full-scale plant development and testing. Economical success in this venture would afford the public with a renewable and limitless source of energy carrier for use in electric power load-leveling and as a carbon-free transportation fuel. The Solar Hydrogen Generation Research (SHGR) project embraces technologies relevant to hydrogen research under the Office of Hydrogen Fuel Cells and Infrastructure Technology (HFCIT) as well as concentrated solar power under the Office of Solar Energy Technologies (SET). Although the photoelectrochemical work is aligned with HFCIT, some of the technologies in this effort are also consistent with the skills and technologies found in concentrated solar power and photovoltaic technology under the Office of Solar Energy Technologies (SET). Hydrogen production by thermo-chemical water-splitting is a chemical process that accomplishes the decomposition of water into hydrogen and oxygen using only heat or a combination of heat and electrolysis instead of pure electrolysis and meets the goals for hydrogen production using only water and renewable solar energy as feed-stocks. Photoelectrochemical hydrogen production also meets these goals by implementing photo-electrolysis at the surface of a semiconductor in contact with an electrolyte with bias provided by a photovoltaic source. Here, water splitting is a photo-electrolytic process in which hydrogen is produced using only solar photons and water as feed-stocks. The thermochemical hydrogen task engendered formal collaborations among two universities, three national laboratories and two private sector entities. The photoelectrochemical hydrogen task included formal collaborations with three universities and one national laboratory. The formal participants in these two tasks are listed above. Informal collaborations in both projects included one additional university (the University of Nevada, Reno) and two additional national laboratories (Lawrence Livermore National Laboratory and Lawrence Berkeley National Laboratory).

Heske, Clemens; Moujaes, Samir; Weimer, Alan; Wong, Bunsen; Siegal, Nathan; McFarland, Eric; Miller, Eric; Lewis, Michele; Bingham, Carl; Roth, Kurth; Sabacky, Bruce; Steinfeld, Aldo

2011-09-29T23:59:59.000Z

313

Flux-difference split parabolized Navier-Stokes algorithm for non-equilibrium chemically reacting flows  

SciTech Connect

A flux-difference split explicit finite-difference algorithm is presented for solving the parabolized form of the equations governing three-dimensional nonequilibrium chemically reacting flows. The algorithm is based on an explicit noniterative, upwind space-marching scheme developed by Korte, but differs in that the unsteady Riemann problem, rather than the steady Riemann problem, is solved. The algorithm allows either a second or an approximately third-order accurate upwind treatment of the convection terms by employing the unsteady approximate Riemann solver of Roe. The source terms of the species transport equations are treated in either an explicit or implicit manner, and the species diffusion terms are modeled with either a Fickian or a multicomponent model. A validation of the algorithm is performed by comparing computational results with the 2-D Mach 14, 15 degree compression-corner data of Holden. The three-dimensional capability of the algorithm is demonstrated by computing Mach 2.7 flow over a swept wedge scramjet fuel injector, and three-dimensional reacting flow capability is demonstrated by a computing a shock-jet interaction concept for mixing and combustion enhancement. 34 refs.

White, J.A.; Korte, J.J.; Gaffney, R.L. Jr. (Analytical Services and Materials, Inc., Hampton, VA (United States) NASA, Langley Research Center, Hampton, VA (United States))

1993-01-01T23:59:59.000Z

314

Exact exchange in relativistic spin-density-functional theory: Exchange splitting versus spin-orbit coupling  

Science Journals Connector (OSTI)

Recently, the concept of the exact orbital-dependent exchange was introduced into relativistic spin-density-functional theory (RSDFT) within the collinear limit [D. Ködderitzsch et al., Phys. Rev. B 77, 045101 (2008)]. In this contribution we further expand this exact exchange (EXX) formalism by (i) extending the basic equations to the general noncollinear form of RSDFT and (ii) discussing in detail the solution of the coupled integral equations resulting from orbital-dependent functionals in the framework of RSDFT. The EXX scheme is then applied to open-shell atoms in order to study (i) the relative importance of exchange splitting and spin-orbit coupling, (ii) the consequences of the exact exchange for atomic hyperfine constants, and (iii) the relative stability of the 3dn?14s2 and 3dn4s1 configurations in case of the 3d transition-metal elements. In particular, it is demonstrated that the exact exchange, when combined with the orbital-dependent random-phase approximation for correlation, yields s-d-transfer energies which are clearly superior to the values obtained with conventional density functionals.

E. Engel, D. Ködderitzsch, and H. Ebert

2008-12-30T23:59:59.000Z

315

Direct Water Splitting under Visible Light with a Nanostructured Photoanode and GaInP2 Photocathode  

SciTech Connect

Thin films of hematite nanorod and GaInP2 were used for direct water splitting under visible light. In open circuit conditions, the potential of hematite shifted cathodically and that of GaInP2 anodically, which generated an open circuit voltage between the two electrodes. In short circuit condition, the combination of the two photoelectrodes can split water under visible light illumination, though with a very low current of {micro}A/cm2 level even at 1 W/cm2 light. By means of chopped light, we found that hematite nanorod has a low photocurrent, which is responsible for the low short circuit current of the 2-electrode combination. The low photoresponse of hematite nanorods is due to the recombination of photo- generated charges, low holes mobility, and short diffusion length.

Wang, H.; Deutsch, T.; Turner, J.

2008-01-01T23:59:59.000Z

316

Atomic population distribution in the output ports of cold-atom interferometers with optical splitting and recombination  

SciTech Connect

Cold-atom interferometers with optical splitting and recombination use off-resonant laser beams to split a cloud of Bose-Einstein condensate (BEC) into two clouds that travel along different paths and are then recombined again using optical beams. After the recombination, the BEC in general populates both the cloud at rest and the moving clouds. Measuring a relative number of atoms in each of these clouds yields information about the relative phase shift accumulated by the atoms in the two moving clouds during the interferometric cycle. We derive the expression for the probability of finding any given number of atoms in each of the clouds, discuss features of the probability density distribution, analyze its dependence on the relative accumulated phase shift as a function of the strength of the interatomic interactions, and compare our results with experiment.

Ilo-Okeke, Ebubechukwu O.; Zozulya, Alex A. [Department of Physics, Worcester Polytechnic Institute, 100 Institute Road, Worcester, Massachusetts 01609 (United States)

2010-11-15T23:59:59.000Z

317

Accumulated photon echo in ruby under hydrostatic pressure: Ground-state splitting and spontaneous decay of 2A¯(2E)  

Science Journals Connector (OSTI)

The technique of accumulated photon echo is used in combination with a high-pressure diamond anvil cell to measure the splitting of the 4A2 ground state and the one-phonon spontaneous decay rate of the 2A¯(2E) level at 1.5 K in ruby up to 4.3 GPa of hydrostatic pressure. The 4A2 ground-state splitting is found to be 0.383±0.001 cm-1 at ambient pressure, and increases with a slope of +(6±1)×10-3 cm-1/GPa. The spontaneous decay rate of 2A¯(2E) increases only weakly with pressure. The pressure dependences of both quantities are accounted for in terms of the trigonal-field and spin-orbit-coupling parameters.

M. H. F. Overwijk; J. I. Dijkhuis; H. W. de Wijn; R. Vreeker; R. Sprik; A. Lagendijk

1991-06-01T23:59:59.000Z

318

Replication-Competent Influenza A Virus That Encodes a Split-Green Fluorescent Protein-Tagged PB2 Polymerase Subunit Allows Live-Cell Imaging of the Virus Life Cycle  

Science Journals Connector (OSTI)

...Influenza A Virus That Encodes a Split-Green Fluorescent Protein-Tagged PB2 Polymerase...circumvent this limitation, we used the split-green fluorescent protein (split-GFP) system...complete replacement of a viral protein by green fluorescent protein (GFP) (e.g...

Sergiy V. Avilov; Dorothée Moisy; Sandie Munier; Oliver Schraidt; Nadia Naffakh; Stephen Cusack

2011-11-23T23:59:59.000Z

319

Electric dipole moments of charged leptons in the split fermion scenario in the two Higgs doublet model  

E-Print Network (OSTI)

We predict the charged lepton electric dipole moments in the split fermion scenario in the framework of the two Higgs doublet model. We observe that the numerical value of the muon (tau) electric dipole moment is at the order of the magnitude of $10^{-22} (e-cm)$ ($10^{-20} (e-cm)$) and there is an enhancement in the case of two extra dimensions, especially for the tau lepton electric dipole moment.

E. O. Iltan

2005-09-24T23:59:59.000Z

320

A review on solar thermal syngas production via redox pair-based water/carbon dioxide splitting thermochemical cycles  

Science Journals Connector (OSTI)

Abstract The high power density, ease of transportation and storage and many years of development of internal combustion engine technologies have put liquid hydrocarbon fuels at a privileged position in our energy mix. Therefore processes that use renewable energy sources to produce liquid hydrocarbon fuels from H2O and CO2 are of crucial importance. Concentrated Solar Power (CSP) can be employed as the only energy source for the renewable production of hydrogen from water either indirectly, e.g. by supplying the electricity for electrolysis, or directly by supplying the necessary heat for thermochemically producing hydrogen. Among the various thermochemical cycles tested so far for CSP-driven hydrogen production via water splitting (WS), those based on redox-pair oxide systems, are directly adaptable to carbon dioxide splitting (CDS) and/or combined CO2/H2O splitting for the production of CO or syngas, respectively. The acknowledgement of this fact has recently revived the interest of the scientific community on such technologies. The current article presents the development, evolution and current status of CSP-aided syngas production via such redox-pair-based thermochemical cycles. At first the various redox oxide material compositions tested for water/carbon dioxide splitting are presented and their redox chemistries are discussed. Then the selection of suitable solar reactors is addressed in conjunction with the boundary conditions imposed by the redox systems as well as the heat demands, technical peculiarities and requirements of the cycle steps. The various solar reactor concepts proposed and employed for such reactions and their current status of development are presented. Finally, topics where further work is needed for commercialization of the technology are identified and discussed.

Christos Agrafiotis; Martin Roeb; Christian Sattler

2015-01-01T23:59:59.000Z

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321

LHC-2008 C.Vallee HERA Structure Functions 1 Physics at LHC-2008 Split, October 1st 2008  

E-Print Network (OSTI)

LHC-2008 C.Vallee HERA Structure Functions 1 LHC Physics at LHC-2008 Split, October 1st 2008 Claude Vallée CPPM/DESY, on behalf of ZEUS and H1 FUNCTIONS STRUCTURE H E R A #12;LHC-2008 C.Vallee HERA/ antiquarks High x quarks/gluon x DGLAP W,Z top DY Jets Higgs Kinematics: HERA LHC , Zo e e q qx Q2 e W q q

322

Combinatorial Development of Water Splitting Catalysts Based on the Oxygen Evolving Complex of Photosystem II  

SciTech Connect

The use of methods to create large arrays of potential catalysts for the reaction H2O ���������������¯�������������������������������  �������������������������������½ O2 + 2H+ on the anode of an electrolysis system were investigated. This reaction is half of the overall reaction involved in the splitting of water into hydrogen and oxygen gas. This method consisted of starting with an array of electrodes and developing patterned electrochemical approaches for creating a different, defined peptide at each position in the array. Methods were also developed for measuring the rate of reaction at each point in the array. In this way, the goal was to create and then tests many thousands of possible catalysts simultaneously. This type of approach should lead to an ability to optimize catalytic activity systematically, by iteratively designing and testing new libraries of catalysts. Optimization is important to decrease energy losses (over-potentials) associated with the water splitting reaction and thus for the generation of hydrogen. Most of the efforts in this grant period were focused on developing the chemistry and analytical methods required to create pattern peptide formation either using a photolithography approach or an electrochemical approach for dictating the positions of peptide bond formation. This involved testing a large number of different reactions and conditions. We have been able to find conditions that have allowed us to pattern peptide bond formation on both glass slides using photolithographic methods and on electrode arrays made by the company Combimatrix. Part of this effort involved generating novel approaches for performing mass spectroscopy directly from the patterned arrays. We have also been able to demonstrate the ability to measure current at each electrode due to electrolysis of water. This was performed with customized instrumentation created in collaboration with Combimatrix. In addition, several different molecular designs for peptides that bound metals (primarily Mn) were developed and synthesized and metal binding was demonstrated. Finally, we investigated a number of methods. We have shown that we can create surfaces on glass slides appropriate for patterning peptide formation and have made arrays of peptides as large as 30,000 using photolithographic methods. However, side reactions with certain amino acid additions greatly limited the utility of the photolithographic approach. In addition, we found that transferring this patterned chemistry approach to large arrays was problematic. Thus, we turned to direct electrochemical patterning using the Combimatrix electrode arrays. Here we were also able to demonstrate patterned peptide bond forming chemistry, but yield and consistency of the reaction remains insufficient to create the quality of array required for realistic optimization of catalytic peptide sequences. We are currently exploring both new polymerization chemistries for generating catalysts on surface as well as adopting methods developed at Intel for creating peptide arrays directly on electronic substrates (silicon wafers).

Woodbury, Neal [Arizona State University

2010-03-31T23:59:59.000Z

323

Saturated critical heat flux in a multi-microchannel heat sink fed by a split flow system  

SciTech Connect

An extensive experimental campaign has been carried out for the measurement of saturated critical heat flux in a multi-microchannel copper heat sink. The heat sink was formed by 29 parallel channels that were 199 {mu}m wide and 756 {mu}m deep. In order to increase the critical heat flux and reduce the two-phase pressure drop, a split flow system was implemented with one central inlet at the middle of the channels and two outlets at either end. The base critical heat flux was measured using three HFC Refrigerants (R134a, R236fa and R245fa) for mass fluxes ranging from 250 to 1500 kg/m{sup 2} s, inlet subcoolings from -25 to -5 K and saturation temperatures from 20 to 50 C. The parametric effects of mass velocity, saturation temperature and inlet subcooling were investigated. The analysis showed that significantly higher CHF was obtainable with the split flow system (one inlet-two outlets) compared to the single inlet-single outlet system, providing also a much lower pressure drop. Notably several existing predictive methods matched the experimental data quite well and quantitatively predicted the benefit of higher CHF of the split flow. (author)

Mauro, A.W.; Toto, D. [Department of Energetics, Applied Thermofluidynamics and Air Conditioning Systems, FEDERICO II University, p.le Tecchio 80, 80125 Napoli (Italy); Thome, J.R. [Laboratory of Heat and Mass Transfer (LTCM), Faculty of Engineering (STI), Ecole Polytechnique Federale de Lausanne (EPFL), Station 9, Lausanne CH-1015 (Switzerland); Vanoli, G.P. [Engineering Department, Sannio University, Corso Garibaldi 107, Palazzo dell'Aquila Bosco Lucarelli, 82100 Benevento (Italy)

2010-01-15T23:59:59.000Z

324

Cryogenic on-chip multiplexer for the study of quantum transport in 256 split-gate devices  

SciTech Connect

We present a multiplexing scheme for the measurement of large numbers of mesoscopic devices in cryogenic systems. The multiplexer is used to contact an array of 256 split gates on a GaAs/AlGaAs heterostructure, in which each split gate can be measured individually. The low-temperature conductance of split-gate devices is governed by quantum mechanics, leading to the appearance of conductance plateaux at intervals of 2e{sup 2}/h. A fabrication-limited yield of 94% is achieved for the array, and a “quantum yield” is also defined, to account for disorder affecting the quantum behaviour of the devices. The quantum yield rose from 55% to 86% after illuminating the sample, explained by the corresponding increase in carrier density and mobility of the two-dimensional electron gas. The multiplexer is a scalable architecture, and can be extended to other forms of mesoscopic devices. It overcomes previous limits on the number of devices that can be fabricated on a single chip due to the number of electrical contacts available, without the need to alter existing experimental set ups.

Al-Taie, H., E-mail: ha322@cam.ac.uk; Kelly, M. J. [Centre for Advanced Photonics and Electronics, Electrical Engineering Division, Department of Engineering, 9 J. J. Thomson Avenue, University of Cambridge, Cambridge CB3 0FA (United Kingdom) [Centre for Advanced Photonics and Electronics, Electrical Engineering Division, Department of Engineering, 9 J. J. Thomson Avenue, University of Cambridge, Cambridge CB3 0FA (United Kingdom); Cavendish Laboratory, Department of Physics, University of Cambridge, J. J. Thomson Avenue, Cambridge CB3 0HE (United Kingdom); Smith, L. W.; Xu, B.; Griffiths, J. P.; Beere, H. E.; Jones, G. A. C.; Ritchie, D. A.; Smith, C. G. [Cavendish Laboratory, Department of Physics, University of Cambridge, J. J. Thomson Avenue, Cambridge CB3 0HE (United Kingdom)] [Cavendish Laboratory, Department of Physics, University of Cambridge, J. J. Thomson Avenue, Cambridge CB3 0HE (United Kingdom); See, P. [National Physical Laboratory, Hampton Road, Teddington, Middlesex TW11 0LW (United Kingdom)] [National Physical Laboratory, Hampton Road, Teddington, Middlesex TW11 0LW (United Kingdom)

2013-06-17T23:59:59.000Z

325

Split and collectorless flotation to medium coking coal fines for multi-product zero waste concept  

Science Journals Connector (OSTI)

The medium coking coal fines of ? 0.5 mm from Jharia coal field were taken for this investigation. The release analysis of the composite coal reveals that yield is very low at 10.0% ash, about 25% at 14% ash and 50% at 17% ash level. The low yield is caused by the presence of high ash finer fraction. The size-wise ash analysis of ? 0.5 mm coal indicated that ? 0.5 + 0.15 mm fraction contains less ash than ? 0.15 mm fraction. Thus, the composite feed was split into ? 0.5 + 0.15 mm and ? 0.15 mm fractions and subjected to flotation separately. The low ash bearing fraction (? 0.5 + 0.15 mm) was subjected to two stages collectorless flotation to achieve the concentrate with 10% ash. The cleaner concentrate (18.9%) with 10% ash was recovered which has an application in metallurgical industries. The concentrate of 30.2% yield with 12.5% ash could be achieved in one stage collectorless flotation which is suitable for use in coke making as sweetener. As the ? 0.15 mm fraction contains relatively high ash, collector aided flotation using sodium silicate was performed to get a concentrate of 23.6% yield with about 17% ash. The blending of this product with cleaner tail obtained from ? 0.5 + 0.15 mm produces about 35.0% yield with 17% ash and that can be utilized for coke making. The reject from the two fractions can be used for conventional thermal power plant or cement industries using a 23.5% ash after one stage collector aided flotation and the final tailings produced content ash of 61.6% can be used for fluidization combustion bed (FBC). This eventually leads to complete utilization of coal.

Shobhana Dey; K.K. Bhattacharyya

2007-01-01T23:59:59.000Z

326

MWCNT/WO{sub 3} nanocomposite photoanode for visible light induced water splitting  

SciTech Connect

The Multi-walled carbon nanotube (MWCNT)/WO{sub 3} nanocomposite thin films with different MWCNT’s weight percentages were prepared by sol–gel method as visible light induced photoanode in water splitting reaction. Weight percentage of MWCNT in the all nanocomposite thin films was confirmed by TGA/DSC analysis. According to XPS analysis, oxygenated groups at the surface of the MWCNT and stoichiometric formation of WO{sub 3} thin films were determined, while the crystalline structure of the nanocomposite samples was studied by XRD indicating (0 0 2) peak of MWCNT in the monoclinic phase of WO{sub 3}. The influence of different weight percentage (wt%) of MWCNT on WO{sub 3} photoactivity showed that the electron conductivity, charge transfer and electron life time had improved as compared with the pure WO{sub 3}. Based on linear sweep voltammetry and chronoamperometry measurements, the (1 wt%) MWCNT/WO{sub 3} nanocomposite thin films photoanode has a maximum photocurrent density of ?4.5 A/m{sup 2} and electron life time of about 57 s. - Graphical abstract: Photocurrent density versus time at constant potential (0.7 V) for the WO{sub 3} films containing different MWCNT weight percentages annealed at 400 °C under 1000 Wm{sup ?2} visible photo-illumination. Display Omitted - Highlights: • MWCNT/ WO{sub 3} nanocomposite thin films were synthesized using sol–gel derived method. • TGA/DSC confirmed the weight percentage of MWCNT in the all nanocomposite thin films. • XPS analysis revealed that WO{sub 3} was attached on the oxygenated group of MWCNT surface. • The Highest Photoelectrochemical activity is achieved for (1 wt%)MWCNT/WO{sub 3} thin film.

Yousefzadeh, Samira [Physics Department, Sharif University of Technology, P.O. Box 11155-9161, Tehran (Iran, Islamic Republic of); Reyhani, Ali [Physics Department, Faculty of Science, Imam Khomeini International University, P.O. Box 34149-16818, Qazvin (Iran, Islamic Republic of); Naseri, Naimeh [Physics Department, Sharif University of Technology, P.O. Box 11155-9161, Tehran (Iran, Islamic Republic of); Moshfegh, Alireza Z., E-mail: moshfegh@sharif.edu [Physics Department, Sharif University of Technology, P.O. Box 11155-9161, Tehran (Iran, Islamic Republic of); Institute for Nanoscience and Nanotechnology, Sharif University of Technology, P.O. Box 14588-89694, Tehran (Iran, Islamic Republic of)

2013-08-15T23:59:59.000Z

327

Profit Split, the Future of Transfer Pricing? Arm’s Length Principle and Formulary Apportionment Revisited from a Theoretical and a Practical Perspective  

Science Journals Connector (OSTI)

This article compares the Profit Split Method (“PSM”), one of the transfer pricing methods for the application of the arm’s length principle, with Formulary Apportionment (“FA”) which is discusse...

Heinz-Klaus Kroppen; Roman Dawid…

2012-01-01T23:59:59.000Z

328

Increasing the solid angle of the Enge Split-Pole Magnetic Spectrograph and continuing the development of the hybrid detector system  

E-Print Network (OSTI)

INCREASING THE SOLID ANGLE OF THK ENGR SPLIT-POLE MAGNETIC SPECTROGRAPH AND CONTINUING THK DEVELOPMENT OF THE HYBRID DETECTOR SYSTEM A Thesis by PHILIP WILLIAM BOWMAN Submitted to the Office of Graduate Studies of Texas A&M University... in partial fulfillment of the requirements for the degree of MASTER OF SCIENCE May 1991 Major Subject: Physics INCREASING THE SOLID ANGLE OF THE ENGR SPLIT-POLE NAGNETIC SPECTROGRAPH AND CONTINUING THE DEVELOPMENT OF THE HYBRID DETECTOR SYSTEN A Thesis...

Bowman, Philip William

2012-06-07T23:59:59.000Z

329

Configuration splitting of the Gamow-Teller resonance in antimony isotopes: Is this a real or a virtual effect?  

SciTech Connect

The Gamow-Teller strength functions for a number of antimony isotopes were calculated within a semimicroscopic approach based on the continuum version of the charge-exchange quasiparticle random-phase approximation and on phenomenologically taking into account the fragmentation effect. The structural effect of splitting of the main maximum of the Gamow-Teller resonance in these isotopes was confirmed. Experimental data on the excitation of this resonance in a direct and a resonance reaction for the {sup 118}Sn parent nucleus were analyzed with allowance for this effect.

Igashov, S. Yu., E-mail: igashov@theor.mephi.ru [All-Russia Research Institute of Automatics (Russian Federation); Rodin, V. A. [Institut fuer theoretische Physik der Universitaet Tuebingen (Germany)] [Institut fuer theoretische Physik der Universitaet Tuebingen (Germany); Urin, M. H. [National Research Nuclear University MEPhI (Russian Federation)] [National Research Nuclear University MEPhI (Russian Federation)

2013-04-15T23:59:59.000Z

330

Poisson's ratio and porosity at Coso geothermal area, California | Open  

Open Energy Info (EERE)

Poisson's ratio and porosity at Coso geothermal area, California Poisson's ratio and porosity at Coso geothermal area, California Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Journal Article: Poisson's ratio and porosity at Coso geothermal area, California Details Activities (1) Areas (1) Regions (0) Abstract: High-resolution, three-dimensional, compressional and shear wave velocity models, derived from microearthquake traveltimes, are used to map the distribution of Poisson's ratio and porosity at Coso Geothermal Area, Inyo County, California. Spatial resolution of the three-dimensional Poisson's ratio and porosity distributions is estimated to be 0.5 km horizontally and 0.8 km vertically. Model uncertainties, + or -1% in the interior and + or -2.3% around the edge of the model, are estimated by a jackknife method. We use perturbations of r = V p /V s ratio and Psi = V p

331

Numerical Modeling At Coso Geothermal Area (2000) | Open Energy Information  

Open Energy Info (EERE)

Numerical Modeling At Coso Geothermal Area (2000) Numerical Modeling At Coso Geothermal Area (2000) Exploration Activity Details Location Coso Geothermal Area Exploration Technique Numerical Modeling Activity Date 2000 Usefulness not indicated DOE-funding Unknown Exploration Basis Determine areas with fault patterns for geothermal development using Poisson's ratio and porosity Notes High-resolution, three-dimensional, compressional and shear wave velocity models, derived from microearthquake travel times, are used to map the distribution of Poisson's ratio and porosity at Coso Geothermal Area. Spatial resolution of the three-dimensional Poisson's ratio and porosity distributions is estimated to be 0.5 km horizontally and 0.8 km vertically. Model uncertainties, + or -1% in the interior and + or -2.3% around the

332

Toward Photochemical Water Splitting Using Band-Gap-Narrowed Semiconductors and Transition-Metal Based Molecular Catalysts  

SciTech Connect

We are carrying out coordinated theoretical and experimental studies of toward photochemical water splitting using band-gap-narrowed semiconductors (BGNSCs) with attached multi-electron molecular water oxidation and hydrogen production catalysts. We focus on the coupling between the materials properties and the H{sub 2}O redox chemistry, with an emphasis on attaining a fundamental understanding of the individual elementary steps in the following four processes: (1) Light-harvesting and charge-separation of stable oxide or oxide-derived semiconductors for solar-driven water splitting, including the discovery and characterization of the behavior of such materials at the aqueous interface; (2) The catalysis of the four-electron water oxidation by dinuclear hydroxo transition-metal complexes with quinonoid ligands, and the rational search for improved catalysts; (3) Transfer of the design principles learned from the elucidation of the DuBois-type hydrogenase model catalysts in acetonitrile to the rational design of two-electron hydrogen production catalysts for aqueous solution; (4) Combining these three elements to examine the function of oxidation catalysts on BGNSC photoanode surfaces and hydrogen production catalysts on cathode surfaces at the aqueous interface to understand the challenges to the efficient coupling of the materials functions.

Muckerman,J.T.; Rodriguez, J.A.; Fujita, E.

2009-06-07T23:59:59.000Z

333

Thermochemical water-splitting cycle, bench-scale investigations and process engineering. Annual report, October 1, 1978-September 30, 1979  

SciTech Connect

A program to investigate thermochemical water splitting has been under way at General Atomic Company (GA) since October 1972. This document is an annual progress report of Department of Energy (DOE) sponsored process development work on the GA sulfur-iodine thermochemical water splitting cycle. The work consisted of laboratory bench-scale investigations, demonstration of the process in a closed-loop cycle demonstrator, and process engineering design studies. A bench-scale system, consisting of three subunits, has been designed to study the cycle under continuous flow conditions. The designs of subunit I, which models the main solution reaction and product separation, and subunit II, which models the concentration and decomposition of sulfuric acid, were presented in an earlier annual report. The design of subunit III, which models the purification and decomposition of hydrogen iodide, is given in this report. Progress on the installation and operation of subunits I and II is described. A closed-loop cycle demonstrator was installed and operated based on a DOE request. Operation of the GA sulfur-iodine cycle was demonstrated in this system under recycle conditions. The process engineering addresses the flowsheet design of a large-scale production process consisting of four chemical sections (I through IV) and one helium heat supply section (V). The completed designs for sections I through V are presented. The thermal efficiency of the process calculated from the present flowsheet is 47%.

Caprioglio, G.; McCorkle, K.H.; Besenbruch, G.E.; Rode, J.S.

1980-03-01T23:59:59.000Z

334

Excitonic fine-structure splitting in telecom-wavelength InAs/GaAs quantum dots: Statistical distribution and height-dependence  

SciTech Connect

The variation of the excitonic fine-structure splitting is studied for semiconductor quantum dots under the influence of a strain-reducing layer, utilized to shift the emission wavelength of the excitonic transition into the telecom-wavelength regime of 1.3–1.5 ?m. By means of a sp{sup 3}s{sup *}-tight-binding model and configuration interaction, we calculate wavelength shifts and fine-structure splittings for various quantum dot geometries. We find the splittings remaining small and even decreasing with strain-reducing layer composition for quantum dots with large height. Combined with an observed increased emission efficiency, the applicability for generation of entanglement photons is persistent.

Goldmann, Elias, E-mail: goldmann@itp.uni-bremen.de; Barthel, Stefan; Florian, Matthias; Jahnke, Frank [Institute of Theoretical Physics, University of Bremen, Otto-Hahn-Allee 1, 28359 Bremen (Germany)] [Institute of Theoretical Physics, University of Bremen, Otto-Hahn-Allee 1, 28359 Bremen (Germany); Schuh, Kolja [College of Optical Sciences, University of Arizona, 1630 E. University Blvd., Tucson, Arizona 85721-0094 (United States)] [College of Optical Sciences, University of Arizona, 1630 E. University Blvd., Tucson, Arizona 85721-0094 (United States)

2013-12-09T23:59:59.000Z

335

A Disilane with a Hypercoordinate Silicon Atom:? Coordination of an Imine Ligand versus Si?Si Bond Splitting  

Science Journals Connector (OSTI)

A Disilane with a Hypercoordinate Silicon Atom:? Coordination of an Imine Ligand versus Si?Si Bond Splitting ... An imine?amine-substituted disilane (NN)MeSi?SiMe(ONO) [(NN) ? PhN(CH2)2NPh; (ONO) ? o-O-p-MeO?C6H3?C(Ph)N?C6H4-o-O] involving a penta- as well as a tetracoordinate silicon atom was synthesized. ... This ligand combination gives rise to a stable disilane with a hypercoordinate silicon atom by the imine donor action, while a 1,1-dichlorosilane (MeCl2Si)?SiMe(ONO) is not available due to Si?Si bond cleavage with formation of the pentacoordinate monosilane SiClMe(ONO). ...

Jörg Wagler

2006-12-07T23:59:59.000Z

336

Foreign Institutional Investors and Corporate Governance in Emerging Markets: Evidence of a Split-Share Structure Reform in China  

Science Journals Connector (OSTI)

Abstract Using data on China’s split-share structure reform that floats non-tradable shares, we find that Qualified Foreign Institutional Investors (QFIIs) have greater influence over the controlling state shareholders than local mutual funds. \\{QFIIs\\} are less prone to political pressure and are more likely to participate in arm’s-length negotiation and monitoring in state-controlled companies. The presence of QFII ownership shortens the duration of the reform and increases the compensation to minority tradable shareholders. Unlike local mutual funds, the positive relationship between state ownership and the compensation to tradable shareholders increases with the presence of QFII ownership. Furthermore, \\{QFIIs\\} increase the likelihood of revision in reform proposals among state-controlled companies. Domestic mutual funds seem to make earnest negotiations in non-state-controlled companies in the absence of political pressure. Evidence suggests that involving foreign institutional investors in corporate governance practices can significantly reduce expropriation by controlling shareholders in emerging markets.

Wei Huang; Tao Zhu

2014-01-01T23:59:59.000Z

337

A unified operator splitting approach for multi-scale fluid-particle coupling in the lattice Boltzmann method  

E-Print Network (OSTI)

A unified framework to derive discrete time-marching schemes for coupling of immersed solid and elastic objects to the lattice Boltzmann method is presented. Based on operator splitting for the discrete Boltzmann equation, second-order time-accurate schemes for the immersed boundary method, viscous force coupling and external boundary force are derived. Furthermore, a modified formulation of the external boundary force is introduced that leads to a more accurate no-slip boundary condition. The derivation also reveals that the coupling methods can be cast into a unified form, and that the immersed boundary method can be interpreted as the limit of force coupling for vanishing particle mass. In practice, the ratio between fluid and particle mass determines the strength of the force transfer in the coupling. The integration schemes formally improve the accuracy of first-order algorithms that are commonly employed when coupling immersed objects to a lattice Boltzmann fluid. It is anticipated that they will also l...

Schiller, Ulf D

2014-01-01T23:59:59.000Z

338

Nuclear Double Resonance Study of Na First-Order Quadrupole Splittings in a NaF-LiF Mixed Crystal  

Science Journals Connector (OSTI)

A nuclear magnetic double resonance experiment has been performed to measure the high-field first-order quadrupole splittings of Na23 nuclei located in the vicinity of Li+ substitutional impurities in a single crystal of NaF. The observed quadrupole-shifted frequency of those Na23 nuclei located at (1,0,1)-type sites [relative to the Li+ impurity at the (0,0,0) lattice site] was e2qQh=±(544±10) kHz with an asymmetry parameter ?=0.65±0.05. For those Na23 nuclei at (0,0,2)-type sites, e2qQh=±(856±10) kHz with ?=0. The values of eq and ? thus obtained are compared with theoretical calculations. A mathematical analysis of the high-field double resonance process as it applies to rare, quadrupole-interacting nuclei is also presented.

Kyler F. Nelson and W. D. Ohlsen

1969-04-10T23:59:59.000Z

339

Exchange interaction and rashba spin splitting effects in electron spin resonance in narrow-gap quantum wells  

SciTech Connect

We report a study of electron spin resonance (ESR) in a perpendicular magnetic field in n-type narrow-gap quantum well (QW) heterostructures. Using the Hartree-Fock approximation, based on the 8×8 k?p Hamiltonian, the many-body corrections to the ESR energy are found to be nonzero in symmetric and asymmetric narrow-gap QWs. We demonstrate a significant enhancement of the ESR energy in asymmetric QWs, induced by the Rashba spin splitting and exchange interaction, as well as the exchange-induced enhancement of the ESR energy in symmetric QWs. The ESR energies estimated for 2DEG in InAs/AlSb QWs are compared with experimental results in weak magnetic fields.

Krishtopenko, S. S. [Institute for Physics of Microstructures RAS, GSP-105, 603950, Nizhny Novgorod, Russia and Laboratoire National des Champs Magnétiques Intenses (LNCMI-T), CNRS UPR 3228 Université de Toulouse, 143 Avenue de Rangueil, F-31400 Toulouse (France); Malyzhenkov, A. V.; Kalinin, K. P.; Ikonnikov, A. V.; Maremyanin, K. V.; Gavrilenko, V. I. [Institute for Physics of Microstructures RAS, GSP-105, 603950, Nizhny Novgorod (Russian Federation); Goiran, M. [Laboratoire National des Champs Magnétiques Intenses (LNCMI-T), CNRS UPR 3228 Université de Toulouse, 143 Avenue de Rangueil, F-31400 Toulouse (France)

2013-12-04T23:59:59.000Z

340

Electronic structure and reactivity in water splitting of the iron oxide dimers and their hexacarbonyls: A density functional study  

SciTech Connect

The iron oxide dimers (FeO){sub 2} and their peroxide isomers are studied with the B3LYP density functional as bare clusters and as hexacarbonyls. Among the bare clusters the planar four-member ring structures are more stable than the non-planar ones and the rhombic dioxide Fe{sub 2}O{sub 2} with antiferromagnetically ordered electrons on iron centers is the global minimum. Water adsorption on the bare diiron dioxide is exothermic, but dissociation does not occur. Carbonylation favors a non-planar Fe{sub 2}O{sub 2} ring for both the dioxides and the peroxides and high electron density at the Fe centers is induced, evidenced by the natural charge distribution, the high proton affinity, and the values of global electronegativity and hardness. The iron dioxide hexacarbonyl Fe{sub 2}O{sub 2}(CO){sub 6} is diamagnetic in the state of the global minimum. It is separated from the next low-lying triplet state by a small energy gap of 0.22 eV. Time-dependent density functional theory methods were applied to examine electron excitations from the ground state to the low-lying triplet states in the hexacarbonyls and their adsorption complexes with water. Singlet-to-triplet state excitations occur via ligand-to-metal charge transfer in the hexacarbonyls; in the adsorption complexes excitations from the oxygen lone pairs to the adsorption center also occur and they appear in the IR-visible region. The lowest energy singlet and triplet state reaction paths for water splitting were followed. On the singlet potential energy surface (PES), water splitting is spontaneous, while for the triplet PES an activation barrier of 14.1 kJ mol{sup ?1} was determined.

Uzunova, Ellie L., E-mail: ellie@svr.igic.bas.bg [Institute of General and Inorganic Chemistry, Bulgarian Academy of Sciences, Sofia 1113 (Bulgaria); Mikosch, Hans [Institute for Chemical Technologies and Analytics, Vienna University of Technology, Getreidemarkt 9/E164-EC, 1060 Vienna (Austria)] [Institute for Chemical Technologies and Analytics, Vienna University of Technology, Getreidemarkt 9/E164-EC, 1060 Vienna (Austria)

2014-01-14T23:59:59.000Z

Note: This page contains sample records for the topic "microearthquake shear-wave splitting" 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

Direct Water Splitting under Visible Light with Nanostructured Hematite and WO3 Photoanodes and a GaInP2 Photocathode  

SciTech Connect

A p-GaInP{sub 2} photocathode was paired with nanostructured hematite and tungsten trioxide photoanodes to investigate the utility of these systems for direct water splitting under visible light illumination. For the hematite system, under illumination at open-circuit conditions, the potential of hematite shifts cathodically and that of the GaInP{sub 2} shifts anodically. Under short-circuit condition and visible light illumination, the combination of the two photoelectrodes can split water, though with a very low rate of a few {micro}A/cm{sup 2} even at an intensity of 1 W/cm{sup 2}. It was determined that the very low photocurrent from the hematite nanorod photoelectrode limits the short-circuit current of the two-photoelectrode combination. Similar potential shifts were observed with the nanostructured WO{sub 3}/GaInP{sub 2} combination. However, at light intensities below 0.2 W/cm{sup 2}, the short-circuited combination would not split water due to an insufficient potential difference. Above 0.2 W/cm{sup 2}, the combination can split water under visible light, with {approx}20 {micro}A/cm{sup 2} obtained at 1 W/cm{sup 2}. A linear photocurrent-light intensity relationship was observed and was attributed to efficient charge transfer and a low recombination of the charge carriers. The bandgap and the associated absorption limit of WO{sub 3} remain a challenge for a higher efficiency system.

Wang, H.; Deutsch, T.; Turner, J. A.

2008-01-01T23:59:59.000Z

342

Evidence for Flow from Hydrodynamic Simulations of p?Pb Collisions at 5.02 TeV from v2 Mass Splitting  

Science Journals Connector (OSTI)

We show that a fluid dynamical scenario, already well tested against identified particle pt spectra, describes quantitatively the observed mass splitting of the elliptical flow coefficients v2 for pions and protons. This provides a strong argument in favor of the existence of a fluid dynamical expansion in p?Pb collisions at 5.02 TeV.

K. Werner; M. Bleicher; B. Guiot; Iu. Karpenko; T. Pierog

2014-06-13T23:59:59.000Z

343

Figure 2 illustrates the proposed arrangement of the system value model for a given UAV design. The properties of the UAV system are split into five categories  

E-Print Network (OSTI)

Figure 2 illustrates the proposed arrangement of the system value model for a given UAV design. The properties of the UAV system are split into five categories: performance, acquisition cost, supportability of mission success minus the life-cycle-cost of the UAV system. This simplified value model accounts

Sóbester, András

344

Research on a Two-Stage Split Injection Control Strategy for Reducing the HC Emission from a GDI Engine during Hot Start  

Science Journals Connector (OSTI)

The start-stop technology is one of the fuel saving strategies at city driving condition, and the gasoline direct injection (GDI) engine can obtain thermal efficiency improvements and fewer heat losses due to the stratified-charge combustion realized ... Keywords: Hydrocarbon emission, engine control, Two-stage, Split injection, start-stop

Shichun Yang; Chong Wang; Chunming Zhao; Kun Deng

2013-12-01T23:59:59.000Z

345

Solar Syngas Production via H2O/CO2-Splitting Thermochemical Cycles with Zn/ZnO and FeO/Fe3O4 Redox Reactions  

Science Journals Connector (OSTI)

Solar Syngas Production via H2O/CO2-Splitting Thermochemical Cycles with Zn/ZnO and FeO/Fe3O4 Redox Reactions† ... The first step, driven by concentrated solar radiation, is the endothermic thermolysis of ZnO producing a gaseous mixture of O2 and ... ...

A. Stamatiou; P. G. Loutzenhiser; A. Steinfeld

2009-08-28T23:59:59.000Z

346

Ultrasonic Shear Wave Velocities of MgSiO3 Perovskite at 8 GPa and 800 K and Lower Mantle Composition  

Science Journals Connector (OSTI)

...wiggler beamline (X17B1) at the National Synchroton Light Source...experiments in SAM-85 at the National Synchroton Light Source (NSLS) of the Brookhaven...wiggler beamline (X17B1) at the National Synchroton Light Source of the Brookhaven National...

Yegor D. Sinelnikov; Ganglin Chen; Daniel R. Neuville; Michael T. Vaughan; Robert C. Liebermann

1998-07-31T23:59:59.000Z

347

Ultrasonic Shear Wave Velocities of MgSiO3 Perovskite at 8 GPa and 800 K and Lower Mantle Composition  

Science Journals Connector (OSTI)

...at the National Synchroton Light Source...carrier frequency. 15 Wang Y. , Phys. Earth...at the National Synchroton Light Source...project; and Y. Wang for providing the...at the National Synchroton Light Source...frequency. Y. Wang, et...

Yegor D. Sinelnikov; Ganglin Chen; Daniel R. Neuville; Michael T. Vaughan; Robert C. Liebermann

1998-07-31T23:59:59.000Z

348

Prediction of lateral variability in fracture intensity using multicomponent shear-wave surface seismic as a precursor to horizontal drilling in the Austin Chalk  

Science Journals Connector (OSTI)

......represents the horizontal borehole. The open square boxes on the horizontal borehole are mudlogger determined...lines intersecting the borehole represent fractures...measurable, even if y is large. However, the differencein...support of a horizontal drilling program. This method......

Michael C. Mueller

1991-12-01T23:59:59.000Z

349

Detailed photoluminescence studies of thin film Cu{sub 2}S for determination of quasi-Fermi level splitting and defect levels  

SciTech Connect

We have studied chalcocite (Cu{sub 2}S) layers prepared by physical vapor deposition with varying deposition parameters by calibrated spectral photoluminescence (PL) and by confocal PL with lateral resolution of ??x?0.9??m. Calibrated PL experiments as a function of temperature T and excitation fluxes were performed to obtain the absolute PL-yield and to calculate the splitting of the quasi-Fermi levels (QFLs) ?=E{sub f,n}?E{sub f,p} at an excitation flux equivalent to the AM 1.5 spectrum and the absorption coefficient ?(??), both in the temperature range of 20?K?T?400?K. The PL-spectra reveal two peaks at E{sub #1}=1.17?eV and E{sub #2}=1.3?eV. The samples show a QFL-splitting of ?>700?meV associated with a pseudo band gap of E{sub g}=1.25?eV. The high-energy peak shows an unexpected temperature behavior, namely, an increase of PL-yield with rising temperature at variance with the behavior of QFL-splitting that decreases with rising T. Our observations indicate that, contrary to common believe, it is not the PL-yield, but rather the QFL-splitting that is the comprehensive indicator of the quality of the excited state in an illuminated semiconductor. A further examination of the lateral variation of opto-electronic properties by confocal PL and the surface contour shows no detectable correlation between Cu{sub 2}S grains/grain boundaries and the PL-yield or QFL-splitting.

Sträter, H., E-mail: hendrik.straeter@uni-oldenburg.de; Brüggemann, R.; Bauer, G. H. [Institute of Physics, Carl von Ossietzky University Oldenburg, 26111 Oldenburg (Germany); Siol, S.; Klein, A.; Jaegermann, W. [Surface Science Division, Institute of Materials Science, Technische Universität Darmstadt, Petersenstraße 32, 64287 Darmstadt (Germany)

2013-12-21T23:59:59.000Z

350

The split system approach to managing time in simulations of hybrid systems having continuous and discrete event components  

SciTech Connect

The efficient and accurate management of time in simulations of hybrid models is an outstanding engineering problem. General a priori knowledge about the dynamic behavior of the hybrid system (i.e. essentially continuous, essentially discrete, or 'truly hybrid') facilitates this task. Indeed, for essentially discrete and essentially continuous systems, existing software packages can be conveniently used to perform quite sophisticated and satisfactory simulations. The situation is different for 'truly hybrid' systems, for which direct application of existing software packages results in a lengthy design process, cumbersome software assemblies, inaccurate results, or some combination of these independent of the designer's a priori knowledge about the system's structure and behavior. The main goal of this paper is to provide a methodology whereby simulation designers can use a priori knowledge about the hybrid model's structure to build a straightforward, efficient, and accurate simulator with existing software packages. The proposed methodology is based on a formal decomposition and re-articulation of the hybrid system; this is the main theoretical result of the paper. To set the result in the right perspective, we briefly review the essentially continuous and essentially discrete approaches, which are illustrated with typical examples. Then we present our new, split system approach, first in a general formal context, then in three more specific guises that reflect the viewpoints of three main communities of hybrid system researchers and practitioners. For each of these variants we indicate an implementation path. Our approach is illustrated with an archetypal problem of power grid control.

Nutaro, James J [ORNL; Kuruganti, Phani Teja [ORNL; Protopopescu, Vladimir A [ORNL; Shankar, Mallikarjun [ORNL

2012-01-01T23:59:59.000Z

351

Multilayer films of indium tin oxide/TiO2 codoped with vanadium and nitrogen for efficient photocatalytic water splitting  

Science Journals Connector (OSTI)

TiO22 films codoped with V cations and N anions were synthesised by RF-magnetron sputtering. The incorporation of V and N in TiO2 lattice produces isolated energy levels near the conduction and valence bands, respectively, causing an effective narrowing of the band gap to 2.5 eV. Recombination of photo-charges was reduced by depositing multilayer films of indium tin oxide (ITO)/V-N-codoped TiO2 with different numbers of bilayers. In multilayer structure, the generated photoelectrons, travelling into TiO2 film of limited thickness, rapidly enter the space charge interface of the ITO/TiO2 films from where they are instantaneously injected into the ITO layer and then removed towards the cathode. The synergic effects created by band narrowing and enhanced charge separation by using codoping and multilayer structure strategy in TiO2 generate higher photocurrent for water splitting under visible light which definitely exceeds that obtained by doping TiO2 with a single, V or N, element.

Z. El Koura; N. Patel; R. Edla; A. Miotello

2014-01-01T23:59:59.000Z

352

Thermochemical water-splitting cycle, bench-scale investigations, and process engineering. Final report, February 1977-December 31, 1981  

SciTech Connect

The sulfur-iodine water-splitting cycle is characterized by the following three reactions: 2H/sub 2/O + SO/sub 2/ + I/sub 2/ ..-->.. H/sub 2/SO/sub 4/ + 2HI; H/sub 2/SO/sub 4/ ..-->.. H/sub 2/O + SO/sub 2/ + 1/2 O/sub 2/; and 2HI ..-->.. H/sub 2/ + I/sub 2/. This cycle was developed at General Atomic after several critical features in the above reactions were discovered. These involved phase separations, catalytic reactions, etc. Estimates of the energy efficiency of this economically reasonable advanced state-of-the-art processing unit produced sufficiently high values (to approx.47%) to warrant cycle development effort. The DOE contract was largely directed toward the engineering development of this cycle, including a small demonstration unit (CLCD), a bench-scale unit, engineering design, and costing. The work has resulted in a design that is projected to produce H/sub 2/ at prices not yet generally competitive with fossil-fuel-produced H/sub 2/ but are projected to be favorably competitive with respect to H/sub 2/ from fossil fuels in the future.

Norman, J.H.; Besenbruch, G.E.; Brown, L.C.; O'Keefe, D.R.; Allen, C.L.

1982-05-01T23:59:59.000Z

353

Observation and scaling of microearthquakes from the Taiwan Chelungpu-fault borehole seismometers  

Science Journals Connector (OSTI)

......Chelungpu-fault borehole seismometers...Chelungpu-fault Drilling Project Borehole Seismometers...Despite the large coseismic slip...stress drops of larger events including...Taiwan Chelungpu drilling project (TCDP...seven-level vertical borehole seismic array......

Yen-Yu Lin; Kuo-Fong Ma; Volker Oye

2012-07-01T23:59:59.000Z

354

Crustal scattering at the KTB from a combined microearthquake and receiver analysis  

Science Journals Connector (OSTI)

......conducted at the KTB main borehole (Oberpfalz, Germany...the conclusion that a large amount of the P coda...conducted in 1994 at the KTB drilling site (Fig. 1) in southeast...in the vicinity of the borehole. The largest earthquake had a local......

Andreas Rietbrock; Frank Scherbaum

1999-01-01T23:59:59.000Z

355

Modeling fault-zone guided waves of microearthquakes in a geothermal...  

Open Energy Info (EERE)

the identification and modeling of such guided waves is an effective tool to locate fracture-induced, low-velocity fault-zone structures in geothermal fields. Authors Lou, M.;...

356

The tectonics and three-dimensional structure of spreading centers--microearthquake studies and tomographic inversions  

E-Print Network (OSTI)

Two-thirds of the Earth's surface has been formed along a global system of spreading centers that are presently manifested in several different structural forms, including the classic rift valley of the Mid-Atlantic Ridge, ...

Toomey, Douglas R

1987-01-01T23:59:59.000Z

357

Tectonics of the Intermountain Seismic Belt, Western United States: Microearthquake Seismicity and Composite Fault Plane Solutions  

Science Journals Connector (OSTI)

...ticular case, changes in the angles...which would change their radial...would only change the dip angles...from generally north to west-northwest-trending...Map of Idaho (Ross and Forrester...Gunnison the name Thousand Lake...study (Fig. 2), and some...dessication of Lake Bonneville, which at its...

358

Hydrothermal microearthquake swarms beneath active vents at Middle Valley, northern Juan de Fuca Ridge  

E-Print Network (OSTI)

, 1983]. In this view, the hydro- thermal reaction zone is a seismogenic zone for micro- earthquakes of the important commercial ore deposits now on land. Hydro- thermal circulation can penetrate several kilometers associated with contraction from thermal strain. [4] A close association between fluid flow and micro

Webb, Spahr C.

359

Micro-Earthquake At Fenton Hill HDR Geothermal Area (Brown, 2009...  

Open Energy Info (EERE)

Dennis, Donald S. Dreesen, Leigh S. House, Hugh D. Murphy, Bruce A. Robinson, Morton C. Smith (1987) The US Hot Dry Rock Project Donald S. Dreesen, Mark V. Malzahn, Michael C....

360

A streamline splitting pore-network approach for computationally inexpensive and accurate simulation of transport in porous media  

SciTech Connect

Several approaches have been developed in the literature for solving flow and transport at the pore-scale. Some authors use a direct modeling approach where the fundamental flow and transport equations are solved on the actual pore-space geometry. Such direct modeling, while very accurate, comes at a great computational cost. Network models are computationally more efficient because the pore-space morphology is approximated. Typically, a mixed cell method (MCM) is employed for solving the flow and transport system which assumes pore-level perfect mixing. This assumption is invalid at moderate to high Peclet regimes. In this work, a novel Eulerian perspective on modeling flow and transport at the pore-scale is developed. The new streamline splitting method (SSM) allows for circumventing the pore-level perfect mixing assumption, while maintaining the computational efficiency of pore-network models. SSM was verified with direct simulations and excellent matches were obtained against micromodel experiments across a wide range of pore-structure and fluid-flow parameters. The increase in the computational cost from MCM to SSM is shown to be minimal, while the accuracy of SSM is much higher than that of MCM and comparable to direct modeling approaches. Therefore, SSM can be regarded as an appropriate balance between incorporating detailed physics and controlling computational cost. The truly predictive capability of the model allows for the study of pore-level interactions of fluid flow and transport in different porous materials. In this paper, we apply SSM and MCM to study the effects of pore-level mixing on transverse dispersion in 3D disordered granular media.

Mehmani, Yashar; Oostrom, Martinus; Balhoff, Matthew

2014-03-20T23:59:59.000Z

Note: This page contains sample records for the topic "microearthquake shear-wave splitting" 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

Photosynthetic water splitting  

SciTech Connect

The photosynthetic unit of hydrogen evolution, the turnover time of photosynthetic hydrogen production, and hydrogenic photosynthesis are discussed in the section on previous work. Recent results are given on simultaneous photoproduction of hydrogen and oxygen, kinetic studies, microscopic marine algae-seaweeds, and oxygen profiles.

Greenbaum, E.

1981-01-01T23:59:59.000Z

362

Photoelectrochemical Water Splitting  

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

In this process, hydrogen is produced from water using sunlight and specialized semiconductors called photoelectrochemical materials. In the photoelectrochemical (PEC) system, the semiconductor uses light energy to directly dissociate water molecules into hydrogen and oxygen. Different semiconductor materials work at particular wavelengths of light and energies.

363

Photoelectrochemical water splitting and simultaneous photoelectrocatalytic degradation of organic pollutant on highly smooth and ordered TiO{sub 2} nanotube arrays  

SciTech Connect

The photoelectrochemical water splitting and simultaneous photoelectrocatalytic degradation of organic pollutant were achieved on TiO{sub 2} nanotube electrodes with double purposes of environmental protection and renewable energy production under illumination of simulated solar light. The TiO{sub 2} nanotube arrays (TiO{sub 2} NTs) were fabricated by a two-step anodization method. The TiO{sub 2} NTs prepared in two-step anodization process (2-step TiO{sub 2} NTs) showed much better surface smoothness and tube orderliness than TiO{sub 2} NTs prepared in one-step anodization process (1-step TiO{sub 2} NTs). In the photoelectrochemical water splitting and simultaneous photoelectrocatalytic decomposition process, the 2-step TiO{sub 2} NTs electrode showed both highest photo-conversion efficiency of 1.25% and effective photodecomposition efficiency with existing of methylene blue (MB) as sacrificial agent and as pollutant target. Those results implied that the highly ordered nanostructures provided direct pathway and uniform electric field distribution for effective charges transfer, as well as superior capabilities of light harvesting. - Graphical Abstract: The photoelectrochemical water splitting for hydrogen generation and simultaneous photoelectrocatalytic degradation of organic pollutant (methylene blue) were achieved on TiO{sub 2} nanotube electrodes with double purposes of environmental protection and renewable energy production under illumination of simulated solar light. Highlights: Black-Right-Pointing-Pointer TiO{sub 2} nanotube arrays were fabricated by a two-step anodization method. Black-Right-Pointing-Pointer Hydrogen generation and organic pollutant degradation were achieved on TiO{sub 2} NTs. Black-Right-Pointing-Pointer Highest photoconversion efficiency of 1.25% was achieved. Black-Right-Pointing-Pointer Increasing orderliness will increase photocatalytic activity of TiO{sub 2} NTs.

Wu Hongjun [College of Chemistry and Chemical Engineering, Northeast Petroleum University, Daqing 163318 (China); Institute of Basic Energy Science and Technology, George Washington University, VA 20147 (United States); Zhang Zhonghai, E-mail: zhonghaizhangwill@gmail.com [Institute of Basic Energy Science and Technology, George Washington University, VA 20147 (United States); Graduate School of Science and Engineering for Research, University of Toyama, 3190 Gofuku, Toyama 930-8555 (Japan)

2011-12-15T23:59:59.000Z

364

A vertical drift chamber as a high resolution focal plane detector for heavy ion spectroscopy with the Enge split-pole spectrometer  

E-Print Network (OSTI)

designed for future heavy ion I spectroscopy applications in the split-pole spectrograph. The hybrid t detector will be capable of identifying heavy iona having masses through A - 20 and energies up to 35 MeV/amu to be available from the new K-500... will be an important tool in the study of reaction products up to its 35 MeV/amu bending limit. Heavy ion reactions excite closely spaced (or even overlapping) discrete and continuum energy states and produce a number of reaction products concentrated at forward...

Yates, Kenneth Warren

2012-06-07T23:59:59.000Z

365

Cost-Effective Mapping of Benthic Habitats in Inland Reservoirs through Split-Beam Sonar, Indicator Kriging, and Historical Geologic Data  

SciTech Connect

Because bottom substrate composition is an important control on the temporal and spatial location of the aquatic community, accurate maps of benthic habitats of inland lakes and reservoirs provide valuable information to managers, recreational users, and scientists. Therefore, we collected vertical, split-beam sonar data (roughness [E1], hardness [E2], and bathymetry) and sediment samples to make such maps. Statistical calibration between sonar parameters and sediment classes was problematic because the E1:E2 ratios for soft (muck and clay) sediments overlapped a lower and narrower range for hard (gravel) substrates. Thus, we used indicator kriging (IK) to map the probability that unsampled locations did not contain coarse sediments. To overcome the calibration issue we tested proxies for the natural processes and anthropogenic history of the reservoir as potential predictive variables. Of these, a geologic map proved to be the most useful. The central alluvial valley and mudflats contained mainly muck and organic-rich clays. The surrounding glacial till and shale bedrock uplands contained mainly poorly sorted gravels. Anomalies in the sonar data suggested that the organic-rich sediments also contained trapped gases, presenting additional interpretive issues for the mapping. We extended the capability of inexpensive split-beam sonar units through the incorporation of historic geologic maps and other records as well as validation with dredge samples. Through the integration of information from multiple data sets, were able to objectively identify bottom substrate and provide reservoir users with an accurate map of available benthic habitat.

Venteris, Erik R.; May, Cassandra

2014-04-23T23:59:59.000Z

366

Novel, band-controlled metal oxide compositions for semiconductor-mediated photocatalytic splitting of water to produce H{sub 2}  

SciTech Connect

Semiconductor-mediated photo-catalytic dissociation of water offers a unique opportunity for the production of H{sub 2}, a sustainable source of energy. More efficient and chemically stable photo-catalysts, however, remain a vital requirement for commercial viability of this process. The recent research in my group has focused on the synthesis of several new metal oxide (MO) photo-catalysts, such as: LaInO{sub 3}, GaFeO{sub 3}, InVO{sub 4}, In{sub 2}TiO{sub 5} and nanotubular TiO{sub 2}. These samples of controlled grain morphology have been synthesized by using different synthesis protocols and with and without coating of a noble metal co-catalyst. The doping of an impurity, either at cationic or at anionic lattice site, has helped in the tailoring of band structure and making these oxides visible-light-sensitive. Our study has revealed that the surface characteristics, grain morphology, band structure, and doping-induced lattice imperfections control the photo-physical properties and overall photo-catalytic water splitting activity of these metal/MO composites [1-6]. We have demonstrated that, besides promoting certain charge-transfer steps, metal-semiconductor interfaces influence the adsorption of water molecules and their subsequent interaction with photo-generated electron-hole pair at the catalyst surface. The role played by the above-mentioned micro-structural properties in photo-catalytic water splitting process will be discussed.

Gupta, Narendra M. [Catalysis Division, National Chemical Laboratory, Dr. Homi Bhabha Road, Pune - 411008 (India)

2013-02-05T23:59:59.000Z

367

Magneto-optical spectrum and the effective excitonic Zeeman splitting energies of Mn and Co-doped CdSe nanowires  

SciTech Connect

The electronic structure of Mn and Co-doped CdSe nanowires are calculated based on the six-band k·p effective-mass theory. Through the calculation, it is found that the splitting energies of the degenerate hole states in Mn-doped CdSe nanowires are larger than that in Co-doped CdSe nanowires when the concentration of these two kinds of magnetic ions is the same. In order to analysis the magneto-optical spectrum of Mn and Co-doped CdSe nanowires, the four lowest electron states and the four highest hole states are sorted when the magnetic field is applied, and the 10 lowest optical transitions between the conduction subbands and the valence subbands at the ? point in Mn and Co-doped CdSe nanowires are shown in the paper, it is found that the order of the optical transitions at the ? point almost do not change although two different kinds of magnetic ions are doped in CdSe nanowires. Finally, the effective excitonic Zeeman splitting energies at the ? point are found to increase almost linearly with the increase of the concentration of the magnetic ions and the magnetic field; meanwhile, the giant positive effective excitonic g factors in Mn and Co-doped CdSe nanowires are predicted based on our theoretical calculation.

Xiong, Wen, E-mail: wenxiong@cqu.edu.cn [Department of Physics, ChongQing University, ChongQing 400044 (China); Chen, Wensuo [Research Institute of China Electronics Technology Group Corporation, ChongQing 400060 (China)

2013-12-21T23:59:59.000Z

368

Precision spectroscopy of the $X\\,^{1}\\Sigma_{g}^{+}, v=0\\rightarrow 1$ ($J=0-2$) rovibrational splittings in H$_{2}$, HD and D$_{2}$  

E-Print Network (OSTI)

Accurate experimental values for the vibrational ground tone or fundamental vibrational energy splitting of H$_2$, HD, and D$_2$ are presented. Absolute accuracies of $2\\times10^{-4}$ cm$^{-1}$ are obtained from Doppler-free laser spectroscopy applied in a collisionless environment. The vibrational splitting frequencies are derived from the combination difference between separate electronic excitations from the $X^{1}\\Sigma_{g}^{+}, v=0, J$ and $v=1, J$ vibrational states to a common $EF^{1}\\Sigma^{+}_{g}, v=0, J$ state. The present work on rotational quantum states $J=1,2$ extends the results reported by Dickenson et al. on $J=0$ [Phys. Rev. Lett. 110 (2013) 193601]. The experimental procedures leading to this high accuracy are discussed in detail. A comparison is made with full \\emph{ab initio} calculations encompassing Born-Oppenheimer energies, adiabatic and non-adiabatic corrections, as well as relativistic corrections and QED-contributions. The present agreement between the experimental results and the ...

Niu, Ming Li; Dickenson, Gareth D; Eikema, Kjeld S E; Ubachs, Wim

2014-01-01T23:59:59.000Z

369

Rashba spin splitting and cyclotron resonance in strained InGaAs/InP heterostructures with a two-dimensional electron gas  

SciTech Connect

Cyclotron resonance and magnetic transport in InP/InGaAs/InP heterostructures with axially symmetric quantum wells are studied experimentally at 4.2 K. An increase in the cyclotron mass at the Fermi level from 0.047m{sub 0} to 0.057m{sub 0} with an increase in the concentration of two-dimensional electrons from 5.5 Multiplication-Sign 10{sup 11} to 2.1 Multiplication-Sign 10{sup 12} cm{sup -3} is shown. The values of the Rashba spin splitting at the Fermi level are determined from Fourier analysis of the beats of Shubnikov-de Haas oscillations. The obtained experimental data are compared with the theoretical results of self-consistent calculations of the energy spectrum and cyclotron masses of 2D electrons performed using the eight-band k {center_dot} p Hamiltonian.

Kalinin, K. P., E-mail: kirill.kalinin@mail.ru; Krishtopenko, S. S.; Maremyanin, K. V.; Spirin, K. E.; Gavrilenko, V. I. [Russian Academy of Sciences, Institute for Physics of Microstructures (Russian Federation)] [Russian Academy of Sciences, Institute for Physics of Microstructures (Russian Federation); Biryukov, A. A.; Baidus, N. V.; Zvonkov, B. N. [Lobachevskyi State University, Physical-Technical Research Institute (Russian Federation)] [Lobachevskyi State University, Physical-Technical Research Institute (Russian Federation)

2013-11-15T23:59:59.000Z

370

Broadening and splitting of emission spectra of a GaInAs/AlInAs quantum cascade laser in a quantising magnetic field  

SciTech Connect

We have studied the effect of a relatively weak quantising magnetic field on emission spectra of a GaInAs/AlInAs quantum cascade laser near 10 K. The results demonstrate that, as the magnetic field induction increases to 7 T, the spectra broaden (to 5 meV) and split into three emission bands. As a result, we observe simultaneously up to 80 longitudinal lasing modes in the three bands and the integrated laser output intensity increases 70 times. The presence of bands in the emission spectra can be accounted for in terms of the magnetic quantisation of the laser levels into spinsplit Landau levels. The increase in emission intensity is attributable primarily to phonon resonance adjustment in a magnetic field. (lasers)

Zasavitskii, I I; Pashkeev, D A; Bushuev, E V; Mikaelyan, G T

2013-02-28T23:59:59.000Z

371

Study of leading strange meson resonances and spin-orbit splittings in K/sup -/p. -->. K/sup -/. pi. /sup +/n at 11 GeV/c  

SciTech Connect

The results from a high-statistics study of K..pi.. elastic scattering in the reaction K/sup -/p ..-->.. K/sup -/..pi../sup +/n are presented. The data for this analysis are taken from an 11-GeV/c K/sup -/p experiment performed on the Large Aperture Solenoidal Spectrometer (LASS) facility at the Stanford Linear Accelerator Center (SLAC). By selecting the very forward produced K/sup -/..pi../sup +/ events, a sample consisting of data for the K..pi.. ..-->.. K..pi.. elastic scattering reaction was extracted. The angular distribution for this meson-meson scattering is studied by use of both a spherical harmonic moments analysis and a partial-wave analysis (PWA). The previously established leading natural spin-parity strange meson resonances (the J/sup P/ = 1/sup -/ K*(895), the 2/sup +/ K*(1430), and the 3/sup -/ K*(1780)) are observed in the results from both the moments analysis and the PWA. In addition, evidence for a new spin 4/sup -/ K* resonance with a mass of 2080 MeV and a width of about 225 MeV is presented. The results from the PWA confirm the existence of a 0/sup +/ kappa (1490) and propose the existence of a second scalar meson resonance, the 0/sup +/ kappa' (1900). Structure in the P-wave amplitude indicates resonance behavior in the mass region near 1700 MeV. In two of the four ambiguous solutions for the mass region above 1800 MeV, there is strong evidence for another P-wave resonant structure near 2100 MeV. The observed strange meson resonances are found to have a natural interpretation in terms of states predicted by the quark model. In particular, the mass splittings of the leading trajectory natural spin-parity strange meson states and the mass splittings between the spin-orbit triplet states are discussed. 59 figures, 17 tables.

Honma, A.K.

1980-11-01T23:59:59.000Z

372

Electric-dipole moment of CaF by molecular-beam, laser-rf, double-resonance study of Stark splittings  

SciTech Connect

The electronic structure of diatomic molecules is much more complex for open-shell sytems (radicals) than for the normal closed-shell systems, and the development of an adequate theoretical understanding will require a substantial upgrading of experimental knowledge in both quality and quantity. The alkaline-earth monohalide family of radicals, with only a single electron outside closed-shell cores, would appear to be a logical starting point for such studies, and there has been a great increase in work in this area in the last few years in spite of the special difficulties of working with free radicals. As the work of measuring the vibrational and rotational structure of the electronic states has become more complete, attention has turned to study of the much weaker spin-rotation and hyperfine interactions. Within the last three years, these interactions have been studied systematically at high precision in the calcium monohalide family with the molecular-beam, laser-rf double-resonance technique. The same method has now been modified and extended to make possible measurement of the electric-dipole moments of these molecules through observation of the Stark splittings of radiofrequency transitions. It is hoped that when considered together, the several types of data will make it possible to understand the ground-state electronic wave functions of these molecules at least qualitatively. 2 figures.

Childs, W.J.; Goodman, L.S.; Nielsen, U.; Pfeufer, V.

1984-01-01T23:59:59.000Z

373

Stuck in a stack—Temperature measurements of the microclimate around split type condensing units in a high rise building in Singapore  

Science Journals Connector (OSTI)

Abstract The use of air-conditioning, the largest energy demand for buildings in the tropics, is increasing as regional population and affluence grow. The majority of installed systems are split type air-conditioners. While the performance of new equipment is much better, the influence of the microclimate where the condensing units are installed is often overlooked. Several studies have used CFD simulations to analyse the stack effect, a buoyancy-driven airflow induced by heat rejected from condensing units. This leads to higher on-coil temperatures, deteriorating the performance of the air-conditioners. We present the first field measurements from a 24-storey building in Singapore. A network of wireless temperature sensors measured the temperature around the stack of condensing units. We found that the temperatures in the void space increased continuously along the height of the building by 10–13 °C, showing a significant stack effect from the rejected heat from condensing units. We also found that hot air gets stuck behind louvres, built as aesthetic barriers, which increases the temperature another 9 °C. Temperatures of around 50 °C at the inlet of the condensing units for floors 10 and above are the combined result, reducing the unit efficiency by 32% compared to the undisturbed design case. This significant effect is completely neglected in building design and performance evaluation, and only with an integrated design process can truly efficient solutions be realised.

Marcel Bruelisauer; Forrest Meggers; Esmail Saber; Cheng Li; Hansjürg Leibundgut

2014-01-01T23:59:59.000Z

374

Focal mechanism determination of induced microearthquakes in an oil field using full waveforms from shallow and deep seismic networks  

E-Print Network (OSTI)

A new, relatively high frequency, full waveform matching method was used to study the focal mechanisms of small, local earthquakes induced in an oil field, which are monitored by a sparse near-surface network and a deep ...

Li, Junlun

375

Analysis of Injection-Induced Micro-Earthquakes in a Geothermal Steam Reservoir, The Geysers Geothermal Field, California  

E-Print Network (OSTI)

and Renewable Energy, Geothermal Technologies Program, ofwith energy extraction at The Geysers geothermal field. We

Rutqvist, J.

2008-01-01T23:59:59.000Z

376

Integrated High Resolution Microearthquake Analysis and Monitoring for Optimizing Steam Production at The Geysers Geothermal Field, California  

E-Print Network (OSTI)

migrate along major fractures and quickly reach productionreservoir. When cool water flows into hot rock fractures,the fracture faces contract by cooling, loosening the

Majer, Ernest; Peterson, John; Stark, Mitch; Smith, Bill; Rutqvist, Jonny; Kennedy, Mack

2004-01-01T23:59:59.000Z

377

Chapter 4, Small Commercial and Residential Unitary and Split System HVAC Cooling Equipment-Efficiency Upgrade Evaluation Protocol: The Uniform Methods Project: Methods for Determining Energy Efficiency Savings for Specific Measures  

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

4: Small Commercial 4: Small Commercial and Residential Unitary and Split System HVAC Cooling Equipment-Efficiency Upgrade Evaluation Protocol David Jacobson, Jacobson Energy Research Subcontract Report NREL/SR-7A30-53827 April 2013 The Uniform Methods Project: Methods for Determining Energy Efficiency Savings for Specific Measures 4 - 1 Chapter 4 - Table of Contents 1 Measure Description .............................................................................................................. 2 2 Application Conditions of Protocol ....................................................................................... 3 2.1 Programs with Enhanced Measures ................................................................................. 5 3 Savings Calculations .............................................................................................................. 6

378

Effect of crystal-field split-off hole and heavy-hole bands crossover on gain characteristics of high Al-content AlGaN quantum well lasers  

E-Print Network (OSTI)

of high Al-content AlGaN quantum well lasers Jing Zhang, Hongping Zhao, and Nelson Tansu Citation: Appl of crystal-field split-off hole and heavy-hole bands crossover on gain characteristics of high Al-content Al characteristics of high Al-content AlGaN quantum wells QWs are analyzed for deep UV lasers. The effect of crystal

Gilchrist, James F.

379

Study of the Rabi splitting at the 5P{sub 3/2} {yields} 5D{sub 5/2,3/2} transitions in the {sup 87}Rb atom upon cascade excitation in a magnetooptical trap  

SciTech Connect

The level splitting appearing upon cascade excitation of the 5D{sub 5/2} and 5D{sub 3/2} levels of the {sup 87}Rb atom in a magnetooptical trap is studied experimentally. The 5S{sub 5/2} and 5P{sub 3/2} levels are coupled by a cooling laser field, the Rabi frequency being comparable with the rate of spontaneous decay of the 5P{sub 3/2} level. The experimental spectral profiles are compared with a theoretical model. (laser spectroscopy)

Akimov, A V; Tereshchenko, E O; Snigirev, S A; Samokotin, A Yu; Sokolov, A V; Sorokin, Vadim N [P N Lebedev Physical Institute, Russian Academy of Sciences, Moscow (Russian Federation)

2010-02-28T23:59:59.000Z

380

Solar hydrogen production using Ce{sub 1-x}Li{sub x}O{sub 2-{delta}} solid solutions via a thermochemical, two-step water-splitting cycle  

SciTech Connect

The reactivity of Ce{sub 1-x}Li{sub x}O{sub 2-{delta}} (x=0.025, 0.05, 0.075 and 0.1) solid solutions during the redox and two-step water-splitting cycles has been investigated in this work. Thermogravimetric analysis (TGA), X-ray diffraction (XRD) patterns and field-emission scanning electron microscopy (FE-SEM) indicate that there are two reaction mechanisms in the O{sub 2}-releasing step and the shift in the reaction mechanisms occurs in the O{sub 2}-releasing step because of sintering at high temperatures, and a decrease in the concentration of lattice oxygen occurs as the O{sub 2}-releasing step proceeds. The reaction in the O{sub 2}-releasing step follows a second-order mechanism over a temperature range of 1000-1170 Degree-Sign C and a contracting-area model over a temperature range of 1170-1500 Degree-Sign C. According to direct gas mass spectroscopy (DGMS), ceria doped at 5 mol% Li exhibits the highest reactivity in the O{sub 2}-releasing step during both redox cycles in air and two-step water-splitting cycles, whereas ceria doped at 2.5 mol% Li yields the highest amount of hydrogen (4.79 ml/g) in the H{sub 2}-generation step during the two-step water-splitting cycles, which is higher than ceria doped with other metals. DGMS and electrochemical impedance spectroscopy (EIS) suggest that the average reaction rate in the H{sub 2}-generation step is influenced by the concentration of extrinsic oxygen vacancies, and thus, the reactivity in the H{sub 2}-generation step, to some degree, could be tuned by varying the concentration of extrinsic oxygen vacancies (Li content). - Graphical abstract: Average reduction fraction of Ce{sub 1-x}Li{sub x}O{sub 2-{delta}} (x=0.025, 0.05, 0.075 and 0.10) solid solutions versus Li content in the O{sub 2}-releasing step during the redox cycles in air and the two-step water-splitting cycles. Highlights: Black-Right-Pointing-Pointer We have investigated Li-doped ceria for hydrogen production using two-step water-splitting cycles. Black-Right-Pointing-Pointer The sintering effect on the reaction mechanisms was first clarified. Black-Right-Pointing-Pointer The shift of reaction mechanisms occurs during the O{sub 2}-releasing step. Black-Right-Pointing-Pointer The reaction-mechanism shift occurs because of sintering at high temperatures. Black-Right-Pointing-Pointer Doping at 2.5 mol% Li results in the highest H{sub 2} yield and cyclability for hydrogen production.

Meng, Qing-Long; Lee, Chong-il; Shigeta, Satoshi [Department of Chemistry, Graduate School of Science and Engineering, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro-Ku, Tokyo 1528850 (Japan)] [Department of Chemistry, Graduate School of Science and Engineering, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro-Ku, Tokyo 1528850 (Japan); Kaneko, Hiroshi [Solutions Research Laboratory, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro-Ku, Tokyo 1528850 (Japan)] [Solutions Research Laboratory, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro-Ku, Tokyo 1528850 (Japan); Tamaura, Yutaka, E-mail: ytamaura@chem.titech.ac.jp [Department of Chemistry, Graduate School of Science and Engineering, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro-Ku, Tokyo 1528850 (Japan)] [Department of Chemistry, Graduate School of Science and Engineering, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro-Ku, Tokyo 1528850 (Japan)

2012-10-15T23:59:59.000Z

Note: This page contains sample records for the topic "microearthquake shear-wave splitting" 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

Simulation and analysis of Magnetically-Applied Pressure-Shear (MAPS) experiments.  

SciTech Connect

A new experimental technique to measure material shear strength at high pressures has been developed for use on magnetohydrodynamic (MHD) drive pulsed power platforms. The technique is referred to as Magnetically-Applied Pressure-Shear (MAPS). By applying an external static magnetic field to the sample region, the MHD drive directly induces a shear stress wave in addition to the usual longitudinal stress wave. Strength is probed by passing this shear wave through a sample material where the transmissible shear stress is limited to the sample strength. The magnitude of the transmitted shear wave is measured via a transverse velocity interferometry system (VISAR) from which the sample strength is determined. The strength of materials is defined as the ability of a material to sustain deviatoric (shear) stresses. Strength is an important aspect of the response of materials subjected to compression to high pressure. Beyond the elastic response, material strength will govern at what pressure and to what extent a material will plastically deform. The MAPS technique cleverly exploits the property that, for a von Mises yield criterion at a given longitudinal stress, the maximum amplitude shear wave that can be transmitted is limited by the strength at that stress level. Successful fielding of MAPS experiments to measure shear stresses relies upon correct numerical simulation of the experiment. Complex wave interactions among forward and reflected longitudinal and shear waves, as well as the advancing magnetic diffusion front of the MHD drive, can make the design of the experiment complicated. Careful consideration must be given to driver, sample, and anvil materials; to the thicknesses of the driver, sample and anvil layers; as well as to the timing of the interacting waves. This paper will present and analyze the 2D MHD simulations used to design the MAPS experiments. The MAPS experiments are modeled using Sandia's ALEGRA-MHD simulation code. ALEGRA-MHD is an operator-split, multi-physics, multi-material, arbitrary lagrangian-eulerian code developed to model magnetic implosion, ceramic fracture, and electromagnetic launch. We will detail the numerical investigations into MHD shear generation, longitudinal and shear stress coupling, timing of wave interactions, and transmission of shear at material interfaces.

Haill, Thomas A.; Alexander, C. Scott; Asay, James Russell

2011-06-01T23:59:59.000Z

382

Closing the circle on the splitting of the atom: The environmental legacy of nuclear weapons production in the United States and what the Department of Energy is doing about it  

SciTech Connect

In the grand scheme of things we are a little more than halfway through the cycle of splitting the atom for weapons purposes. If we visualize this historic cycle as the full sweep of a clockface, at zero hour we would find the first nuclear chain reaction by Enrico Fermi, followed immediately by the Manhattan Project and the explosion of the first atomic bombs. From two o`clock until five, the United States built and ran a massive industrial complex that produced tens of thousands of nuclear weapons. At half past, the Cold War ended, and the United States shut down most of its nuclear weapons factories. The second half of this cycle involves dealing with the waste and contamination from nuclear weapons production - a task that had, for the most part, been postponed into the indefinite future. That future is now upon us. Dealing with the environmental legacy of the Cold War is in many ways as big a challenge for us today as the building of the atomic bomb was for the Manhattan Project pioneers in the 1940s. Our challenges are political and social as well as technical, and we are meeting those challenges. We are reducing risks, treating wastes, developing new technologies, and building democratic institutions for a constructive debate on our future course.

NONE

1996-01-01T23:59:59.000Z

383

Differential analysis of coda Q using similar microearthquakes in seismic gaps. Part 1: Techniques and application to seismograms recorded in the Anza Seismic gap  

Science Journals Connector (OSTI)

...timated multi-taper standard deviation [o'(ravg obs); tower left; (10)]; the predicted In spectral ratio ob- tained...mdtuoL"(886I)"f'aamllned "8~II -9~11'8"1107"saE"S ~ld aD'ZH0~pueIUOOA'~30q&Ioqdsoq3!|oq3 u!suo...

Richard C. Aster; George Slad; Joseph Henton; Michael Antolik

384

Instead of splitting the atom --the  

E-Print Network (OSTI)

the atomic bomb and led to civilian nuclear plants - - ITER seeks to harness nuclear fusion: the power the atomic bomb and led to civilian nuclear plants -- ITER seeks to harness nuclear fusion: the power a few minutes and input/yield ratios remain low. That compares with ITER's goal of producing sustained

385

subspace accelerated matrix splitting algorithms for bound ...  

E-Print Network (OSTI)

Their algorithm uses a projected gradient search in the first phase ..... eration is generally superior to a projected gradient iteration in terms of identifying an optimal ..... Once the subspace step has been computed, we enter Step 3 and compute.

2011-09-28T23:59:59.000Z

386

Experience with split transition lattices at RHIC  

SciTech Connect

During the acceleration process, heavy ion beams in RHIC cross the transition energy. When RHIC was colliding deuterons and gold ions during Run-8, lattices with different integer tunes were used for the two rings. This resulted in the two rings crossing transition at different times, which proved beneficial for the 'Yellow' ring, the RF system of which is slaved to the 'Blue' ring. For the symmetric gold-gold run in FY2010, lattices with different transition energies but equal tunes were implemented. We report the optics design concept as well as operational experience with this configuration.

Montag, C.; Tepikian, S.; Blaskiewicz, M.; Brennan, J.M.

2010-05-23T23:59:59.000Z

387

Quantum Memory with a controlled homogeneous splitting  

E-Print Network (OSTI)

We propose a quantum memory protocol where a input light field can be stored onto and released from a single ground state atomic ensemble by controlling dynamically the strength of an external static and homogeneous field. The technique relies on the adiabatic following of a polaritonic excitation onto a state for which the forward collective radiative emission is forbidden. The resemblance with the archetypal Electromagnetically-Induced-Transparency (EIT) is only formal because no ground state coherence based slow-light propagation is considered here. As compared to the other grand category of protocols derived from the photon-echo technique, our approach only involves a homogeneous static field. We discuss two physical situations where the effect can be observed, and show that in the limit where the excited state lifetime is longer than the storage time, the protocols are perfectly efficient and noise-free. We compare the technique to other quantum memories, and propose atomic systems where the experiment c...

Hétet, G; Chanelière, T

2013-01-01T23:59:59.000Z

388

Building Better Catalysts for Splitting Water  

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

Scientists are eagerly developing catalysts to lower the energy demands, and thus the cost, of H2 production. Yet, they still struggle with the basics, such as what structural...

389

Destabilizing amalgamated Heegaard splittings Jennifer Schultens  

E-Print Network (OSTI)

|K, then we say that K is in bridge position with respect to h. The bridge number of K, b(K), is the minimal number of maxima required for h|K. Definition 3. If K is in bridge position, then a regular level surface on S3 is a Morse function with exactly two critical points. This last assumption guarantees that h

Weidmann, Richard

390

Destabilizing amalgamated Heegaard splittings Jennifer Schultens  

E-Print Network (OSTI)

is in bridge position with respect to h. The bridge number of K, b(K), is the minimal number of maxima required for h|K. Definition 3. If K is in bridge position, then a regular level surface below all maxima is a Morse function with exactly two critical points. This last assumption guarantees that h induces

Schultens, Jennifer

391

Rating of Mixed Split Residential Air Conditioners  

E-Print Network (OSTI)

by the indoor fan, the indoor fan is characterized by its power needed to provide this CFM, and the expansion device is characterized by its restrictiveness to the refrigerant flow (explained later). A computer model of a heat pump was used in this study.... The structure of HPSIM is modular. The model consists of 41 subprograms for heat pump component simulation, heat transfer, fluid mechan- ics, and fluid property calculation. The program totals approximately 5000 Fortran statements. UncL -'< Fig. 2...

Domanski, P. A.

1988-01-01T23:59:59.000Z

392

Nanostructured Hematite for Photoelectrochemical Water Splitting  

E-Print Network (OSTI)

International Photonics and Optoelectronics Meetings (POEM),International Photonics and Optoelectronics Meetings (POEM),

Ling, Yichuan

2014-01-01T23:59:59.000Z

393

A quasi-Newton proximal splitting method  

E-Print Network (OSTI)

Jun 20, 2012 ... These methods have seen success, but are not as efficient or ..... If (y, ?) is a primal-dual solution to (14), the KKT conditions must be satisfied:.

2012-06-20T23:59:59.000Z

394

Splitting the Cycle the Right Way  

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

This presentation discusses prototype design, operation, and in-cylinder data on a novel engine concept for which models show 55% BTE.

395

Creation of an Engineered Geothermal System through Hydraulic...  

Office of Environmental Management (EM)

More Documents & Publications Microearthquake Technology for EGS Fracture Characterization Advanced 3D Geophysical Imaging Technologies for Geothermal Resource...

396

Intersectional Cre Driver Lines Generated Using Split-Intein Mediated Split-Cre Reconstitution  

E-Print Network (OSTI)

Tissue and cell type highly specific Cre drivers are very rare due to the fact that most genes or promoters used to direct Cre expressions are generally expressed in more than one tissues and/or in multiple cell types. We ...

Wang, Ping

397

Technical Publications in Refereed Journals, Invited Contributions in Edited Technical Books and extended juried  

E-Print Network (OSTI)

shear wave polarization corrections across multiple offsets and anisotropic in the productive zone for the Marcellus Shale, WV -- Expanded Abstracts, Vol. 33, 84th

Yang, Zong-Liang

398

Characterizing Fractures in the Geysers Geothermal Field by Micro...  

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

Geothermal Field by Micro-seismic Data, Using Soft Computing, Fractals, and Shear Wave Anisotropy Characterizing Fractures in the Geysers Geothermal Field by Micro-seismic...

399

Detachment Faulting & Geothermal Resources - Pearl Hot Spring...  

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

Crump Geyser: High Precision Geophysics & Detailed Structural Exploration & Slim Well Drilling Conducting a 3D Converted Shear Wave Project to Reduce Exploration Risk at Wister, CA...

400

Temporal Velocity Variations beneath the Coso Geothermal Field...  

Open Energy Info (EERE)

beneath the Coso Geothermal Field Observed using Seismic Double Difference Tomography of Compressional and Shear Wave Arrival Times Jump to: navigation, search GEOTHERMAL...

Note: This page contains sample records for the topic "microearthquake shear-wave splitting" 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

Category:Passive Seismic Techniques | Open Energy Information  

Open Energy Info (EERE)

has the following 2 subcategories, out of 2 total. M Micro-Earthquake 1 pages T Teleseismic-Seismic Monitoring 1 pages Pages in category "Passive Seismic...

402

Research overview 2007 Department of Geophysics, belonging to the Faculty of Mathematics and Physics,  

E-Print Network (OSTI)

aspects. Research is tightly coupled with education at the bachelor, master and doctoral levels. In 2007 and applied geophysicists (Schlumberger Cambridge Research), studying microearthquakes induced by oil drilling

Cerveny, Vlastislav

403

Seismicity Protocol | Department of Energy  

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

Geothermal Technology Program Peer Review Report Microearthquake Technology for EGS Fracture Characterization Monitoring the Effect of Injection of Fluids from the Lake County...

404

Newberry EGS Demonstration | Department of Energy  

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

Production: Evaluation of Stimulation at the Newberry Volcano EGS Demonstration Site Microearthquake Technology for EGS Fracture Characterization Newberry Volcano EGS Demonstration...

405

Development of an Updated Induced Seismicity Protocol for the...  

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

Geothermal Technology Program Peer Review Report Microearthquake Technology for EGS Fracture Characterization; 2010 Geothermal Technology Program Peer Review Report Analysis of...

406

E-Print Network 3.0 - analysis sanjiku hodogram Sample Search...  

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

Collection: Fossil Fuels 3 Induced Microearthquake Patterns and Oil-Producing Fracture Systems in the Austin Chalk Summary: analysis (Flinn, 1965) to compute hodogram...

407

IMPROVED METHODS FOR MAPPING PERMEABILITY AND HEAT SOURCES IN...  

Open Energy Info (EERE)

IMPROVED METHODS FOR MAPPING PERMEABILITY AND HEAT SOURCES IN GEOTHERMAL AREAS USING MICROEARTHQUAKE DATA Jump to: navigation, search OpenEI Reference LibraryAdd to library...

408

collab meeting-5-1_split.xls  

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

Zeroth order agenda Zeroth order agenda SNAP Collaboration Meeting 6, 7, and 8 June, 2005 Plenary 9:00am SNAP Progress (30) Saul/Levi Project Status (30) Heetderks CCD development Holland 10:30am Break (30) 11:00am CCD assembly Baltay NIR development Tarle Focal Plane Bebek Telescope/ TMA-68 Lampton 12:30pm Lunch (90) 2:00pm Dark Energy Task Force (15) Cahn SDT Panel Discussion (30) Baltay SN Factory (30) Aldering Computing (30) McKee 3:30pm Break (30) 4:00pm Electronics Hvd Lippe Calibration Deustua Spectrograph Demo Ealet 6:00pm reception @ Henry's Monday Tuesday Parallel 1 Parallel 2 Parallel 3 NIR 1 Tarle W / L, Simulation, & LSST Sim Team Rhodes Tests of Raytheon HgCdTe SRA #141(15+3) Brown Tests of Rockwell Banded Array FPA#25 (15+3) Schubnell NIR Detector Noise (15+3) Smith GSFC (10+2) Woodgate Status of InGaAs Testing at JPL(10+2)

409

2012 Cropping Strategies: Split-Pivot Systems to  

E-Print Network (OSTI)

;Cropping With Less Water Irrigating less vs. irrigating more efficiently-- Over the past 20 years what we it! #12;Do you need re-evaluate pre-plant irrigation? Water use efficiency of preplant irrigation the advantages of increased water use efficiency Once the crop is established, at some point we can

Behmer, Spencer T.

410

Rabi-split states broadened by a continuum  

SciTech Connect

In this work we theoretically investigate a ?-like three-level system. Our model consists of a onedimensional quantum well with a nearby continuum. The ? level structure is formed by the ground state (a valence band state) and two excited states (both in conduction band), one being a localized and the other a quasi-bound state which is interacting with the continuum. An infrared (IR) field is used to drive the excited states into dressed states creating Autler-Townes doublets. We solve the semiconductor Bloch equation, in real space and in time domain, to follow the interband optical excitation dynamics. The optical absorption and the photocurrent spectra are calculated for different potential barriers separating the well and the continuum. We show how this affects the Autler-Townes doublets since this is a possible way of changing the relationship between the IR Rabi frequency and the dephasing rates.

Maialle, M. Z.; Degani, M. H. [Faculdade de Ciências Aplicadas, Universidade Estadual de Campinas, Limeira-SP (Brazil); Madureira, J. R. [Universidade Federal de Uberlândia, Utuiutaba-MG (Brazil)

2013-12-04T23:59:59.000Z

411

A Note on Split Rank of Intersection Cuts  

E-Print Network (OSTI)

due to Cook et al. [13]. ... defined and analyzed in Cook et al. ...... on the boundary of QSv,Sr are not cut off by the constraints (17) then the lower bound on the.

2008-10-08T23:59:59.000Z

412

On the Relative Strength of Split, Triangle and Quadrilateral Cuts  

E-Print Network (OSTI)

in the interior of each of its edges; (iii) A quadrilateral containing exactly four integral points, with exactly one of them in the interior of each of its edges; Moreover, these four integral points are vertices equation (such as Gomory mixed integer cuts [13], MIR cuts [16], lift-and-project cuts [3], lifted cover

Cornuejols, Gerard P.

413

Convergence analysis for a primal-dual monotone + skew splitting ...  

E-Print Network (OSTI)

Nov 7, 2012 ... Research partially supported by DFG (German Research Foun- ... †Faculty of Mathematics, Chemnitz University of Technology, D-09107 Chemnitz, Germany, e-mail: ...... Figure (a) shows the clean 256 × 256 cameraman.

2012-11-07T23:59:59.000Z

414

Crystallographic orientation inhomogeneity and crystal splitting in biogenic calcite  

Science Journals Connector (OSTI)

...as well as the European COST Action (TD0903). M.-G.W. was supported by FCT projects PTDC/CTM/100468/2008 and REDE/1509/RME/2005 of the Portuguese Ministerio da Educacao e Ciencia. A.G.-S. and C.M.P. also acknowledge the Centro...

2013-01-01T23:59:59.000Z

415

Solar Water Splitting To Generate Hydrogen Fuel:? Photothermal Electrochemical Analysis  

Science Journals Connector (OSTI)

A photoelectrolysis system can contain multiple photoharvesting units and electrolysis units, where the ratio of electrolysis to photovolatic units is defined as R. ...

Stuart Licht

2003-04-11T23:59:59.000Z

416

Global convergence of splitting methods for nonconvex composite ...  

E-Print Network (OSTI)

composite optimization. Guoyin Li ?. Ting Kei Pong †. November 30, 2014. Abstract. We consider the problem of minimizing the sum of a smooth function h with ...

2014-11-30T23:59:59.000Z

417

A Monotone+Skew Splitting Model for Composite Monotone ...  

E-Print Network (OSTI)

solving a large class of composite monotone inclusions and their duals can be reduced to that of finding a zero of the sum of a maximally monotone operator and ...

2010-11-24T23:59:59.000Z

418

Split-System Cold Climate Heat Pump | Department of Energy  

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

prototype test system ORNLEmerson laboratory prototype test system Lead Performer: Oak Ridge National Laboratory - Oak Ridge, TN Partners: -- Unico, Inc. - St. Louis, MO --...

419

A splitting method for separate convex programming with linking ...  

E-Print Network (OSTI)

Jun 25, 2010 ... let N = 2 in (5.5), which is to restore a blurred image with additive ..... and E. Fatemi, Nonlinear total variation based noise removal algorithms,.

2010-06-25T23:59:59.000Z

420

Application of the Strictly Contractive Peaceman-Rachford Splitting ...  

E-Print Network (OSTI)

May 17, 2014 ... the noise is the mixture of an additive Gaussian white noise and an impulse ... restoration model for mixed noise removal which was proposed.

2014-05-17T23:59:59.000Z

Note: This page contains sample records for the topic "microearthquake shear-wave splitting" 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

Hamiltonian interpolation of splitting approximations for nonlinear PDEs  

E-Print Network (OSTI)

Grébert2 1 INRIA & ENS Cachan Bretagne, Avenue Robert Schumann F-35170 Bruz, France. email: Erwan coincides with the discrete flow at each time step over a long time depending on a non resonance condition

Faou, Erwan

422

Hamiltonian interpolation of splitting approximations for nonlinear PDEs  

E-Print Network (OSTI)

´ebert2 1 INRIA & ENS Cachan Bretagne, Avenue Robert Schumann F-35170 Bruz, France. email: Erwan coincides with the discrete flow at each time step over a long time depending on a non resonance condition

Paris-Sud XI, Université de

423

Boosting the Efficiency of Suspended Photocatalysts for Overall Water Splitting  

E-Print Network (OSTI)

to the cost of photovoltaics and make solar energy technology even less competitive with polluting fossil energy carriers. Solar-energy-driven water electrolysis can be a viable solution to this problem. Hydrogen is the smallest and easiest to fabricate "battery" that exists, and it can be used as a gaseous

Osterloh, Frank

424

Snow ball earth and the split of Streptophyta and Chlorophyta  

E-Print Network (OSTI)

) and Trebouxiophyceae (e.g., Chlorella) [3,10,11]. The Streptophyta include all embryophyte plants (land plants

425

Water-splitting using photocatalytic porphyrin-nanotube composite devices  

DOE Patents (OSTI)

A method for generating hydrogen by photocatalytic decomposition of water using porphyrin nanotube composites. In some embodiments, both hydrogen and oxygen are generated by photocatalytic decomposition of water.

Shelnutt, John A. (Tijeras, NM); Miller, James E. (Albuquerque, NM); Wang, Zhongchun (Albuquerque, NM); Medforth, Craig J. (Winters, CA)

2008-03-04T23:59:59.000Z

426

Split-flow regeneration in absorptive air separation  

DOE Patents (OSTI)

A chemical absorptive separation of air in multiple stage of absorption and desorption is performed with partial recycle of absorbent between stages of desorption necessary to match equilibrium conditions in the various stages of absorption. This allows reduced absorbent flow, reduced energy demand and reduced capital costs. 4 figs.

Weimer, R.F.

1987-11-24T23:59:59.000Z

427

Split-flow regeneration in absorptive air separation  

DOE Patents (OSTI)

A chemical absorptive separation of air in multiple stage of absorption and desorption is performed with partial recycle of absorbent between stages of desorption necessary to match equilibrium conditions in the various stages of absorption. This allows reduced absorbent flow, reduced energy demand and reduced capital costs.

Weimer, Robert F. (Allentown, PA)

1987-01-01T23:59:59.000Z

428

Water Splitting DOI: 10.1002/anie.201203174  

E-Print Network (OSTI)

energy needs to be controlled to minimize the accumulation of gas bubbles on the surface important for nonplanar devices with high surface areas, such as those explored in this study and conversion efficien- cies of approximately 12% in InP photocathodes.[19

Javey, Ali

429

Mode Splitting for Efficient Plasmoinc Thin-film Solar Cell  

E-Print Network (OSTI)

We propose an efficient plasmonic structure consisting of metal strips and thin-film silicon for solar energy absorption. We numerically demonstrate the absorption enhancement in symmetrical structure based on the mode coupling between the localized plasmonic mode in Ag strip pair and the excited waveguide mode in silicon slab. Then we explore the method of symmetry-breaking to excite the dark modes that can further enhance the absorption ability. We compare our structure with bare thin-film Si solar cell, and results show that the integrated quantum efficiency is improved by nearly 90% in such thin geometry. It is a promising way for the solar cell.

Li, Tong; Jiang, Chun

2010-01-01T23:59:59.000Z

430

An investigation of Network Splitting for Fault Level Reduction  

E-Print Network (OSTI)

main methods for fault level reduction namely current limiting reactor, Is-limiter, superconducting term as it is relatively inexpensive and furthermore it has high reliability and flexibility. Modelling in the bus-section. The analysis shows that the fault current is sensitive to closure of the normally open

Watson, Andrew

431

Optical power splitter for splitting high power light  

DOE Patents (OSTI)

An optical power splitter for the distribution of high-power light energy has a plurality of prisms arranged about a central axis to form a central channel. The input faces of the prisms are in a common plane which is substantially perpendicular to the central axis. A beam of light which is substantially coaxial to the central axis is incident on the prisms and at least partially strikes a surface area of each prism input face. The incident beam also partially passes through the central channel. 5 figs.

English, R.E. Jr.; Christensen, J.J.

1995-04-18T23:59:59.000Z

432

Focusing the view on nature's water-splitting catalyst  

Science Journals Connector (OSTI)

...but did not significantly change the i,iso values (less than 10%). This is expected...agreement between our Q-band derived A i,iso values for the S2 state (NQI excluded during...A.Z. acknowledge support by SfB 498 (TP C7). V.K.Y. and J.Y. acknowledge...

2008-01-01T23:59:59.000Z

433

White Papers on Materials for Photoelectrochemical Water Splitting  

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

Series of white papers from the U.S. Department of Energy Photoelectrochemical Working Group (Revision: October 2013). These white papers are intended as concise living documents summarizing the unique potential and challenges faced in the R&D of promising materials classes.

434

Small-Molecule Control of Protein Degradation Using Split Adaptors  

E-Print Network (OSTI)

Targeted intracellular degradation provides a method to study the biological function of proteins and has numerous applications in biotechnology. One promising approach uses adaptor proteins to target substrates with ...

Davis, Joseph H.

435

Chemically Modified Metal Oxide Nanostructure for Photoelectrochemical Water Splitting  

E-Print Network (OSTI)

and the widespread use of hydrogen powered fuel cells is theHydrogen is an energy carrier, which combines oxygen in a fuel cell

Wang, Gongming

2013-01-01T23:59:59.000Z

436

August 28, 1997 A FluxSplit Algorithm  

E-Print Network (OSTI)

or of the fluid as a whole) approach c, the velocity of light in vacuum, or those where the effects henceforth) has come to play an important role in science. In Nuclear Physics, heavy­ion collision experiments taking place nowadays in large particle accelerators produce beams with velocities equal

Soatto, Stefano

437

Characterization of split ends function during Drosophila eye development  

E-Print Network (OSTI)

Conserved signal transduction pathways coordinate all aspects of metazoan development, including cell fate specification, differentiation, and growth. Rather than functioning as completely independent modules, signaling ...

Doroquez, David Bagon

2007-01-01T23:59:59.000Z

438

Light Verbs and Split Ergativity in the Western Cholan Languages  

E-Print Network (OSTI)

analyzed (historically as well as diachronically) as involving nominalization. In order to evaluate the status of cha’len it is useful to compare the Chol examples with similar cases in its closest relative, Chontal of Tabasco, as well as other comparative...

Montgomery-Anderson, Brad

2006-01-01T23:59:59.000Z

439

Oil Recovery Enhancement from Fractured, Low Permeability Reservoirs. [Carbonated Water  

DOE R&D Accomplishments (OSTI)

The results of the investigative efforts for this jointly funded DOE-State of Texas research project achieved during the 1990-1991 year may be summarized as follows: Geological Characterization - Detailed maps of the development and hierarchical nature the fracture system exhibited by Austin Chalk outcrops were prepared. The results of these efforts were directly applied to the development of production decline type curves applicable to a dual-fracture-matrix flow system. Analysis of production records obtained from Austin Chalk operators illustrated the utility of these type curves to determine relative fracture/matrix contributions and extent. Well-log response in Austin Chalk wells has been shown to be a reliable indicator of organic maturity. Shear-wave splitting concepts were used to estimate fracture orientations from Vertical Seismic Profile, VSP data. Several programs were written to facilitate analysis of the data. The results of these efforts indicated fractures could be detected with VSP seismic methods. Development of the EOR Imbibition Process - Laboratory displacement as well as Magnetic Resonance Imaging, MRI and Computed Tomography, CT imaging studies have shown the carbonated water-imbibition displacement process significantly accelerates and increases recovery from oil saturated, low permeability rocks. Field Tests - Two operators amenable to conducting a carbonated water flood test on an Austin Chalk well have been identified. Feasibility studies are presently underway.

Poston, S. W.

1991-00-00T23:59:59.000Z

440

E-Print Network 3.0 - atoll french polynesia Sample Search Results  

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

Summary: .1365-246X.2007.03475.x GJISeismology Upper-mantle flow beneath French Polynesia from shear wave... broad-band stations deployed in French Polynesia from...

Note: This page contains sample records for the topic "microearthquake shear-wave splitting" 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

SSA 2012 Annual Meeting Announcement  

Science Journals Connector (OSTI)

...Continental Scale Programs. Schultz, A., and Hu, X. 11:45 Generation and Propagation of Shear Waves from the HUMBLE REDWOOD Explosions. Bonner, J. L., Leidig, M. R., Reinke, R., and Lenox, E. Topography Effects on a Single Slope...

442

Using neural networks to predict thermal conductivity from geophysical well logs  

Science Journals Connector (OSTI)

......mineralogic indicator), shear wave velocity (an energy transport property) and spontaneous potential...259-564. Della Vedova B. , Von Herzen R., 1987. Geothermal heat flux at the COST B-2 and B-3 wells, US Atlantic continental......

Bruno Goutorbe; Francis Lucazeau; Alain Bonneville

2006-07-01T23:59:59.000Z

443

Method and apparatus for measuring stress  

DOE Patents (OSTI)

A method and apparatus for determining stress in a material independent of micro-structural variations and anisotropies. The method comprises comparing the velocities of two horizontally polarized and horizontally propagating ultrasonic shear waves with interchanged directions of propagation and polarization. The apparatus for carrying out the method comprises periodic permanent magnet-electromagnetic acoustic transducers for generating and detecting the shear waves and means for determining the wave velocities.

Thompson, R.B.

1983-07-28T23:59:59.000Z

444

IMPROVED METHODS FOR MAPPING PERMEABILITY AND HEAT SOURCES IN GEOTHERMAL  

Open Energy Info (EERE)

IMPROVED METHODS FOR MAPPING PERMEABILITY AND HEAT SOURCES IN GEOTHERMAL IMPROVED METHODS FOR MAPPING PERMEABILITY AND HEAT SOURCES IN GEOTHERMAL AREAS USING MICROEARTHQUAKE DATA Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Conference Proceedings: IMPROVED METHODS FOR MAPPING PERMEABILITY AND HEAT SOURCES IN GEOTHERMAL AREAS USING MICROEARTHQUAKE DATA Details Activities (1) Areas (1) Regions (0) Abstract: Geothermal microearthquakes, and the seismic waves they generate, provide a rich source of information about physical processes associated with Enhanced Geothermal Systems (EGS) experiments and other geothermal operations. With support from the Dept. of Energy, we are developing several software packages to enhance the utility of microearthquake data in geothermal operations and EGS experiments. Two of these are: 1. Enhanced

445

Research overview 2009 Department of Geophysics, belonging to the Faculty of Mathematics and Physics,  

E-Print Network (OSTI)

also planetary aspects. Research is tightly coupled with education at the bachelor, master and doctoral microearthquakes induced by drilling for oil. Preparations were also carried to join one new European project

Cerveny, Vlastislav

446

Research overview 2008 Department of Geophysics, belonging to the Faculty of Mathematics and Physics,  

E-Print Network (OSTI)

also planetary aspects. Research is tightly coupled with education at the bachelor, master and doctoral microearthquakes induced by drilling for oil. We were invited to join also three new European project proposals

Cerveny, Vlastislav

447

Prospecting for geothermal energy by geophysical methods  

Science Journals Connector (OSTI)

Types of geothermal deposit are indicated and prospecting methods are described. These include aerial IR surveys, geoelectrical investigations, geothermal measurements, explosion seismics, microearthquakes, and ground-noise surveys, gravity studies and airborne magnetic surveys and geomagnetics

R. Haenel

1977-01-01T23:59:59.000Z

448

Browse by Discipline -- E-print Network Subject Pathways: Biology...  

Office of Scientific and Technical Information (OSTI)

B C D E F G H I J K L M N O P Q R S T U V W X Y Z Los Alamos National Laboratory, Earth and Environmental Sciences Division, Fracture Mapping Using Induced Microearthquakes Profect...

449

RAPID/NEPA | Open Energy Information  

Open Energy Info (EERE)

Magnetotelluric Survey at Soda Lake CX Nevada Geothermal BLM Nevada State Office CX for Micro-Earthquake Survey at ?? Geothermal Area CX Geothermal BLM Nevada State Office CX for...

450

Seismic Background Noise and Detection Threshold in the Southern Great Basin Digital Seismic Network  

Science Journals Connector (OSTI)

...Vegas, Nevada. The funding was directed through...Microearthquakes at Yucca Mountain, Nevada, Bull...events within 10 km of Yucca Mountain with three or more...United States waste disposal Yucca Mountain GeoRef, Copyright...

David H. von Seggern

451

Organometallics 1993, 12, 3896-3905 Metallocene Analogues with Split (2 + 4)-?r-Electron  

E-Print Network (OSTI)

.2.1.02s63deca-3,8-dien-5-yl (DICP) anion with iron(I1) and chromium(I1) chloride the orange diamagnetic)MII(CO)~(8) and (BC0D)K and Cp*Ni(acac) (Cp* = pentamethylcyclopentadienyl, acac = acetylacetonate) gave. The X-ray crystal analysis of 11 confirmed the qs bonding of BCOD to iron and showed a gauche

Bluemel, Janet

452

Synthesis and characterization of titanium-alloyed hematite thin films for photoelectrochemical water splitting  

SciTech Connect

We have synthesized pure and Ti-alloyed hematite thin films on F doped SnO{sub 2} coated glass substrates by radio frequency magnetron co-sputtering of iron oxide and titanium targets in mixed Ar/O{sub 2} and mixed N{sub 2}/O{sub 2} ambient. We found that the hematite films deposited in the N{sub 2}/O{sub 2} ambient exhibit much poorer crystallinity than the films deposited in the Ar/O{sub 2} ambient. We determined that Ti alloying leads to increased electron carrier concentration and crystallinity, and reduced bandgaps. Moreover, Ti-alloyed hematite thin films exhibited improved photoelectrochemical performance as compared with the pure hematite films: The photocurrents were enhanced and the photocurrent onset shifted to less positive potentials.

Tang Houwen [National Renewable Energy Laboratory, 1617 Cole Boulevard, Golden, Colorado 80401 (United States); University of Denver, Electrical Engineering Department, 2390 S. York Street, Denver, Colorado 80210 (United States); Matin, M. A. [University of Denver, Electrical Engineering Department, 2390 S. York Street, Denver, Colorado 80210 (United States); Wang, Heli; Deutsch, Todd; Al-Jassim, Mowafak; Turner, John; Yan, Yanfa [National Renewable Energy Laboratory, 1617 Cole Boulevard, Golden, Colorado 80401 (United States)

2011-12-15T23:59:59.000Z

453

Synthesis and Characterization of Titanium-Alloyed Hematite Thin Films for Photoelectrochemical Water Splitting  

SciTech Connect

We have synthesized pure and Ti-alloyed hematite thin films on F doped SnO{sub 2} coated glass substrates by radio frequency magnetron co-sputtering of iron oxide and titanium targets in mixed Ar/O{sub 2} and mixed N{sub 2}/O{sub 2} ambient. We found that the hematite films deposited in the N{sub 2}/O{sub 2} ambient exhibit much poorer crystallinity than the films deposited in the Ar/O{sub 2} ambient. We determined that Ti alloying leads to increased electron carrier concentration and crystallinity, and reduced bandgaps. Moreover, Ti-alloyed hematite thin films exhibited improved photoelectrochemical performance as compared with the pure hematite films: The photocurrents were enhanced and the photocurrent onset shifted to less positive potentials.

Tang, H.; Matin, M. A.; Wang, H.; Deutsch, T.; Al-Jassim, M.; Turner, J.; Yan, Y.

2011-12-15T23:59:59.000Z

454

FY07 LDRD Final Report Precision, Split Beam, Chirped-Pulse, Seed Laser Technology  

SciTech Connect

The goal of this LDRD ER was to develop a robust and reliable technology to seed high-energy laser systems with chirped pulses that can be amplified to kilo-Joule energies and recompressed to sub-picosecond pulse widths creating extremely high peak powers suitable for petawatt class physics experiments. This LDRD project focused on the development of optical fiber laser technologies compatible with the current long pulse National Ignition Facility (NIF) seed laser. New technologies developed under this project include, high stability mode-locked fiber lasers, fiber based techniques for reduction of compressed pulse pedestals and prepulses, new compact stretchers based on chirped fiber Bragg gratings (CFBGs), new techniques for manipulation of chirped pulses prior to amplification and new high-energy fiber amplifiers. This project was highly successful and met virtually all of its goals. The National Ignition Campaign has found the results of this work to be very helpful. The LDRD developed system is being employed in experiments to engineer the Advanced Radiographic Capability (ARC) front end and the fully engineered version of the ARC Front End will employ much of the technology and techniques developed here.

Dawson, J W; Messerly, M J; Phan, H H; Crane, J K; Beach, R J; Siders, C W; Barty, C J

2009-11-12T23:59:59.000Z

455

On the complexity of cutting plane proofs using split cuts Sanjeeb ...  

E-Print Network (OSTI)

Jun 16, 2008 ... A e start off by proving the properties (A) and ( U ) given in Section 2 for ..... [o ] S. A. Cook and A. ? aken, An exponential lower bound for the ...

2008-06-16T23:59:59.000Z

456

Wireless Solar Water Splitting Using Silicon-Based Semiconductors and Earth-Abundant Catalysts  

Science Journals Connector (OSTI)

...G. N. Baum, J. Perez, K. N. Baum, U.S. Department of Energy, Dec. 2009. Available online at: http://www1.eere.energy.gov/hydrogenandfuelcells/pdfs/pec_technoeconomic_analysis.pdf. 40 Conway B. E. Bai L. , H2 evolution...

Steven Y. Reece; Jonathan A. Hamel; Kimberly Sung; Thomas D. Jarvi; Arthur J. Esswein; Joep J. H. Pijpers; Daniel G. Nocera

2011-11-04T23:59:59.000Z

457

Single element spectral splitting solar concentrator for multiple cells CPV system  

E-Print Network (OSTI)

Shockley Read Hall equation poses a limit to the maximum conversion efficiency of broadband solar radiation attainable by means of a single bandgap converter. A possible approach to overcome such a limit is to convert ...

Stefancich, Marco

458

Split-Step Eigenvector-Following Technique for Exploring Enthalpy Landscapes at Absolute Zero  

Science Journals Connector (OSTI)

John C. Mauro * ... We have implemented this algorithm and tested it for a 64-atom selenium system with periodic boundary conditions using the ab initio potentials of Mauro and Varshneya. ... (14)?Mauro, J. C.; Loucks, R. J.; Balakrishnan, J. J. Phys. ...

John C. Mauro; Roger J. Loucks; Jitendra Balakrishnan

2006-02-22T23:59:59.000Z

459

Oxygen exchange materials for solar thermochemical splitting of H2O and CO2: a review  

Science Journals Connector (OSTI)

This review summarizes state of the art metal oxide materials used in two-step thermochemical redox cycles for the production of H2 and CO from H2O and CO2 using concentrated solar energy. Advantages and disadvantages of both stoichiometric (e.g. iron oxide based cycles) and nonstoichiometric (e.g. ceria based cycles) materials are discussed in the context of thermodynamics, chemical kinetics, and material stability. Finally, a perspective aimed at future materials development and requirements necessary for advances of process efficiencies is discussed.

Jonathan R. Scheffe; Aldo Steinfeld

2014-01-01T23:59:59.000Z

460

Sustained H2 Production Driven by Photosynthetic Water Splitting in a Unicellular Cyanobacterium  

Science Journals Connector (OSTI)

...Department of Energy, and is a contribution of the PNNL Biofuels and Foundational...hydrogen gas as a biofuel. Curr. Opin...Suda S. 1995. Alternative and cyclic appearance...of blue-green algae (cyanobacteria...

Matthew R. Melnicki; Grigoriy E. Pinchuk; Eric A. Hill; Leo A. Kucek; Jim K. Fredrickson; Allan Konopka; Alexander S. Beliaev

2012-08-01T23:59:59.000Z

Note: This page contains sample records for the topic "microearthquake shear-wave splitting" 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

Thrust measurement of a split-path, valveless pulse detonation engine .  

E-Print Network (OSTI)

??Theory predicts ideal pulse detonation technology offers significant fuel efficiency advantages over ramjet/scramjet architecture within a range from high subsonic to low hypersonic velocities. In… (more)

Bartosh, Brady J.

2007-01-01T23:59:59.000Z

462

Operator-Split RungeKuttaRosenbrock Methods for Nonhydrostatic Atmospheric Models  

E-Print Network (OSTI)

- trasting this against a vertical discretization with a mini- mum near-surface grid spacing of about 100 m grid spacing leads to a stringent restriction on the time step to maintain numerical stability. Instead by the grid spacing and wave speed in the horizontal. The high-order finite-volume model is tested against

Ullrich, Paul

463

Tuning Range-Separated Density Functional Theory for Photocatalytic Water Splitting Systems  

E-Print Network (OSTI)

We discuss the applicability of long-range separated density functional theory (DFT) to the prediction of electronic transitions of a particular photocatalytic system based on an Ir(III) photosensitizer (IrPS). Special attention is paid to the charge-transfer properties which are of key importance for the photoexcitation dynamics, but and cannot be correctly described by means of conventional DFT. The optimization of the range-separation parameter is discussed for IrPS including its complexes with electron donors and acceptors used in photocatalysis. Particular attention is paid to the problems arising for a description of medium effects by a polarizable continuum model.

Bokareva, Olga S; Bokarev, Sergey I; Kühn, Oliver

2015-01-01T23:59:59.000Z

464

Invariant-Domain Commutation Theory Applied to the Mass-Splitting Principle  

Science Journals Connector (OSTI)

This chapter serves primarily to illustrate the sorts of applications to commutation problems for physical observables which lie within the scope of the globally-invariant-domain (DR) commutation methods devel...

Palle E. T. Jørgensen; Robert T. Moore

1984-01-01T23:59:59.000Z

465

Efficient Photochemical Water Splitting by a Chemically Modified n-TiO2  

Science Journals Connector (OSTI)

...j p ( E rev 0 – | E app | ) × 100 / ( I 0 ) ] j p E 0 rev I 0 E app E app E app = ( E meas – E aoc ) E meas j p E aoc j p 2 E aoc ?2 E meas E doc ? eff E app Eq. 1. . 23 Bird R. E. Hulstrom R. L. Leis L. J. , Sol. Energy 30...

Shahed U. M. Khan; Mofareh Al-Shahry; William B. Ingler; Jr.

2002-09-27T23:59:59.000Z

466

Plane wave stability of the split-step Fourier method for the nonlinear Schrodinger equation  

E-Print Network (OSTI)

of linear stability and a non-resonance condition. They can both be verified if the time step Bretagne, Avenue Robert Schumann, F-35170 Bruz, France (Erwan.Faou@inria.fr). 2D´epartement de math

Faou, Erwan

467

Modified energy for split-step methods applied to the linear Schrdinger equation  

E-Print Network (OSTI)

and Erwan Faou INRIA & ENS Cachan Bretagne, Avenue Robert Schumann F-35170 Bruz email: Arnaud. Moreover, even in this situation, resonances effects appear for some values of h: typically when exp

Debussche, Arnaud

468

Modified energy for split-step methods applied to the linear Schrdinger equation  

E-Print Network (OSTI)

and Erwan Faou INRIA & ENS Cachan Bretagne, Avenue Robert Schumann F-35170 Bruz email: Arnaud, and under a generic non resonance condition on the stepsize. When h is of the particular form h = 2/(k2 - 2) for some integers k and , resonance effects occur and the preservation properties of the scheme

Faou, Erwan

469

Modified energy for split-step methods applied to the linear Schrodinger equation  

E-Print Network (OSTI)

and Erwan Faou INRIA & ENS Cachan Bretagne, Avenue Robert Schumann F-35170 Bruz email: Arnaud the potential function is small and smooth. Moreover, even in this situation, resonances effects appear for some

Paris-Sud XI, Université de

470

1d5/2-2s1/2 splitting in light nuclei  

Science Journals Connector (OSTI)

Energy differences between 1d5/2 and 2s1/2 states in light nuclei are reviewed and systematized. A simple model accounts for the Coulomb shifts.

H. T. Fortune

1995-10-01T23:59:59.000Z

471

Bandgap Engineering of 1-Dimensional Nitride and Oxynitride Materials for Solar Water Splitting  

E-Print Network (OSTI)

Hydrogen Production: Standards for Methods, Definitions, andHydrogen Production: Standards for Methods, Definitions, andHydrogen Production: Standards for Methods, Definitions, and

Hahn, Christopher

2012-01-01T23:59:59.000Z

472

Isospin mass splittings from precision-measurements of D*-D mass-differences  

E-Print Network (OSTI)

Using the decay modes D*+ --> D+ pi0 and D*0 --> D0pi0, we have measured the D*+-D+ and D*0-D0 mass differences to be 140.64 +/- 0.08 +/- 0.06 and 142.12 +/- 0.05 +/- 0.05 MeV, respectively. Combining these measurements with the Particle Data Group...

Ammar, Raymond G.; Ball, S.; Baringer, Philip S.; Coppage, Don; Copty, N.; Davis, Robin E. P.; Hancock, N.; Kelly, M.; Kwak, Nowhan; Lam, H.

1992-10-01T23:59:59.000Z

473

Photoelectrochemical Water Splitting of Nitrogen and Hydrogen Treated P25 TiO2 Films  

E-Print Network (OSTI)

CdS and CdSe have been successfully employed in the sensitization of TiO 2 . Although sensitization and doping

Zavodivker, Liat Shari

2014-01-01T23:59:59.000Z

474

Bandgap Engineering of 1-Dimensional Nitride and Oxynitride Materials for Solar Water Splitting  

E-Print Network (OSTI)

1-x O x ) nanotubes were studied using TEM energy dispersivethe band gap energy of GaN:ZnO nanotubes. Samples wereINCA energy dispersive X-ray detector. Different nanotubes

Hahn, Christopher

2012-01-01T23:59:59.000Z

475

Experimental investigation of the effect of split injection on diesel engine performance  

Science Journals Connector (OSTI)

The combustion process in diesel engines is under constant study. A major research effort is being made to establish a better understanding of diesel combustion. Many issues regarding diesel combustion remain unresolved, and these issues may prevent the use of diesel engines due to increasingly stricter air pollution legislation. This study dealt with the effect of the fuel injection profile on diesel engine performance through the utilisation of different multiple injection strategies. From the engineering point of view, establishing a continuous fuel injection profile with the ability to change fuel flow is impossible today. The most feasible engineering solution to continuous fuel injection profile is the utilisation of multiple injection events, which enables control of fuel flow. Multiple injection as a tool to control combustion in diesel engines has been studied for several years, this study investigated the effect of different two injection strategies on the combustion. The results and the analysis of the results demonstrate that multiple injections affect both the physical processes and the kinetics of combustion. Proper division of the injected fuel among injections may decrease engine emissions considerably while causing only a minor decrease in engine efficiency.

Gideon Goldwine; Eran Sher

2009-01-01T23:59:59.000Z

476

The finite torsion subgroup of an LCA group need not split  

Science Journals Connector (OSTI)

A locally compact abelian topological groupG is constructed whose maximal torsion subgroup is finite but not a topological direct summand ofG.

J. A. Khan

1995-08-01T23:59:59.000Z

477

A primal-dual splitting algorithm for finding zeros of sums of ...  

E-Print Network (OSTI)

Jun 26, 2012 ... Foundation), projects BO 2516/4-1 and WA922/1-3. ...... of the Matlab functions imfilter and fspecial, we blurred the image as follows: 1.

2012-06-26T23:59:59.000Z

478

On the splitting of the Bloch-Beilinson filtration Arnaud BEAUVILLE  

E-Print Network (OSTI)

(X) , with CHp (X) = F0 CHp (X) . . . Fp+1 (X) = 0 and F1 CH(X) = Ker cX . We refer to [J] for a discussion graduation given by CHp (A) = s CHp s(A) , where CHp s(A) is the subspace of elements CHp (A) with k A = k2 not define the required filtration because the vanishing of the terms CHp s(A) for s

Beauville, Arnaud

479

Plasmonic Enhancement in BiVO 4 Photonic Crystals for Ef? cient Water Splitting  

E-Print Network (OSTI)

, S. R. Pendlebury , M. Barroso , K. Sivula , M. Grätzel , J. R. Durrant , D. R. Klug , J. Am. Chem. Soc. 2011 , 133 , 10134 . [30] Y. B. Li , T. Takata , D. Cha , K. Takanabe , T. Minegishi , J. Kubota , K. Domen...

Zhang, Liwu; Lin, Chia-Yu; Valev, Ventsislav K.; Reisner, Erwin; Steiner, Ullrich; Baumberg, Jeremy J.

2014-06-11T23:59:59.000Z

480

Decoupled catalytic hydrogen evolution from a molecular metal oxide redox mediator in water splitting  

Science Journals Connector (OSTI)

...electacta.2007.11.027 37 Gahleitner G. , Hydrogen from renewable electricity: An international review of power-to-gas pilot plants for stationary applications . Int. J. Hydrogen Energy 38 , 2039 – 2061 ( 2013 ). 10.1016/j.ijhydene...

Benjamin Rausch; Mark D. Symes; Greig Chisholm; Leroy Cronin

2014-09-12T23:59:59.000Z

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


481

FlexSplit: A Workload-Aware, Adaptive Load Balancing Strategy for Media Cluster  

E-Print Network (OSTI)

Hewlett-Packard Laboratories 1501 Page Mill Road Palo Alto, CA 94303 lucy.cherkasova@hp.com Evgenia Smirni and medium videos (2 min-15 min), and the encoding bit rates, targeting the current Internet population

Smirni, Evgenia

482

Quantitative evaluation reveals taxonomic over-splitting in extinct marine invertebrates: implications in conserving biodiversity  

Science Journals Connector (OSTI)

Till date, morphology in general was characterized qualitatively to support the traditional classification system. This study for the first time uses an integrated approach to explore the appropriateness of tradi...

Rituparna Bose; Arnab De

2013-12-01T23:59:59.000Z

483

Nucleic acid encoding a self-assembling split-fluorescent protein system  

DOE Patents (OSTI)

The invention provides a protein labeling and detection system based on self-complementing fragments of fluorescent and chromophoric proteins. The system of the invention is exemplified with various combinations of self-complementing fragments derived from Aequorea victoria Green Fluorescent Protein (GFP), which are used to detect and quantify protein solubility in multiple assay formats, both in vitro and in vivo.

Waldo, Geoffrey S; Cabantous, Stephanie

2014-04-01T23:59:59.000Z

484

Optimization Online - The split-demand one-commodity pickup-and ...  

E-Print Network (OSTI)

Jun 20, 2014 ... Category 1: Applications -- OR and Management Sciences (Transportation ) ... Category 3: Integer Programming (Cutting Plane Approaches ).

Juan-Jose Salazar-Gonzalez

2014-06-20T23:59:59.000Z

485

Caustic Recycle from Hanford Tank Waste Using NaSICON Ceramic Membrane Salt Splitting Process  

SciTech Connect

A family of inorganic ceramic materials, called sodium (Na) Super Ion Conductors (NaSICON), has been studied at Pacific Northwest National Laboratory (PNNL) to investigate their ability to separate sodium from radioactively contaminated sodium salt solutions for treating U.S. Department of Energy (DOE) tank wastes. Ceramatec Inc. developed and fabricated a membrane containing a proprietary NAS-GY material formulation that was electrochemically tested in a bench-scale apparatus with both a simulant and a radioactive tank-waste solution to determine the membrane performance when removing sodium from DOE tank wastes. Implementing this sodium separation process can result in significant cost savings by reducing the disposal volume of low-activity wastes and by producing a NaOH feedstock product for recycle into waste treatment processes such as sludge leaching, regenerating ion exchange resins, inhibiting corrosion in carbon-steel tanks, or retrieving tank wastes.

Fountain, Matthew S.; Kurath, Dean E.; Sevigny, Gary J.; Poloski, Adam P.; Pendleton, J.; Balagopal, S.; Quist, M.; Clay, D.

2009-02-20T23:59:59.000Z

486

Distributed Reforming of Renewable Liquids via Water Splitting using Oxygen Transport Membrane (OTM) (Presentation)  

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

Presented at the 2007 Bio-Derived Liquids to Hydrogen Distributed Reforming Working Group held November 6, 2007 in Laurel, Maryland.

487

1 An Algorithm to Determine the Clique Number of a Split Graph O ...  

E-Print Network (OSTI)

Let n be an integer such n?3, for k such 1?k?n-1, we define the nxn matrices Tk+1 by : (Tk+1)i .... [1] M. R. Garey, D. S. Johnson, "Computers and intractability.

moi

2008-01-30T23:59:59.000Z

488

Acid-split flowsheets for uranium-plutonium partitioning without a reductant  

SciTech Connect

The flowsheet discussed has been tested in a hot cell experiment using 10% TBP and a poorly controlled temperature near 15/sup 0/C. The test was carried out in the Solvent Extraction Test Facility at Oak Ridge National Laboratory, using highly irradiated mixed-oxide fuel from the Fast Flux Test Facility reactor at Hanford, Washington. The observed concentration profiles for U, Pu, and acid are shown graphically.

Campbell, D.O.; Crouse, D.J.; Mills, A.L.

1986-01-01T23:59:59.000Z

489

Emergence of a Partially Split Flux Tube into the Solar Atmosphere  

Science Journals Connector (OSTI)

......the magnetic flux, energy, and helicity injected...travels through the solar interior toward the...emerging into the solar atmosphere. We start...magnetic flux, magnetic energy and magnetic helicity...emerging into the solar atmosphere. To obtain...thank the Hinode project for generous financial......

Tetsuya Magara

2008-08-25T23:59:59.000Z

490

Local Mass Conservation and Velocity Splitting in PV-Based Balanced Models. Part II: Numerical Results  

E-Print Network (OSTI)

are the plain and hyperbalance PBMs defined in Part I. More precisely, they are the plain- , plain- , and plain. As proved in Part I, except for the leading-order plain- each plain PBM violates local mass conservation. Each hyperbalance PBM results from enforcing local mass conservation on the corresponding plain PBM

Cambridge, University of

491

Optimization of PHEV Power Split Gear Ratio to Minimize Fuel Consumption and Operation Cost.  

E-Print Network (OSTI)

??A Plug-in Hybrid Electric Vehicle (PHEV) is a vehicle powered by a combination of an internal combustion engine and an electric motor with a battery… (more)

Li, Yanhe

2013-01-01T23:59:59.000Z

492

Resistance and polarization losses in aqueous buffermembrane electrolytes for water-splitting photoelectrochemical cells  

E-Print Network (OSTI)

fuels.1 Renewable, carbon-neutral energy sources will be needed on the scale of terawatts to minimize be powered by several carbon-neutral energy sources including photovoltaic (PV)- coupled electrolyzers.2 that efficient photoelectrochemical cells (PECs) might be constructed from terrestrially abundant materials

493

Lighting energy savings potential of split-pane electrochromic windows controlled for daylighting with visual comfort  

E-Print Network (OSTI)

Energy Performance of Electrochromic Windows Controlled forenergy performance of electrochromic windows. Proceedingssignal for daylight (electrochromic window, no overhang).

Fernandes, Luis

2014-01-01T23:59:59.000Z

494

Structural Changes in the Mn(4)Ca Cluster And the Mechanism of Photosynthetic Water Splitting  

SciTech Connect

Photosynthetic water oxidation, where water is oxidized to dioxygen, is a fundamental chemical reaction that sustains the biosphere. This reaction is catalyzed by a Mn{sub 4}Ca complex in the photosystem II (PS II) oxygen-evolving complex (OEC): a multiprotein assembly embedded in the thylakoid membranes of green plants, cyanobacteria, and algae. The mechanism of photosynthetic water oxidation by the Mn{sub 4}Ca cluster in photosystem II is the subject of much debate, although lacking structural characterization of the catalytic intermediates. Biosynthetically exchanged Ca/Sr-PS II preparations and x-ray spectroscopy, including extended x-ray absorption fine structure (EXAFS), allowed us to monitor Mn-Mn and Ca(Sr)-Mn distances in the four intermediate S states, S{sub 0} through S{sub 3}, of the catalytic cycle that couples the one-electron photochemistry occurring at the PS II reaction center with the four-electron water-oxidation chemistry taking place at the Mn{sub 4}Ca(Sr) cluster. We have detected significant changes in the structure of the complex, especially in the Mn-Mn and Ca(Sr)-Mn distances, on the S{sub 2}-to-S{sub 3} and S{sub 3}-to-S{sub 0} transitions. These results implicate the involvement of at least one common bridging oxygen atom between the Mn-Mn and Mn-Ca(Sr) atoms in the O-O bond formation. Because PS II cannot advance beyond the S{sub 2} state in preparations that lack Ca(Sr), these results show that Ca(Sr) is one of the critical components in the mechanism of the enzyme. The results also show that Ca is not just a spectator atom involved in providing a structural framework, but is actively involved in the mechanism of water oxidation and represents a rare example of a catalytically active Ca cofactor.

Pushkar, Y.; Yano, J.; Sauer, K.; Boussac, A.; Yachandra, V.K.

2009-05-21T23:59:59.000Z

495

Photoassisted Overall Water Splitting in a Visible Light-Absorbing Dye-Sensitized Photoelectrochemical Cell  

E-Print Network (OSTI)

agents has enabled separate explorations of the hydrogen- and oxygen-evolving half-reactions.5,6 However the ruthenium center and the surfaces of the respective oxides. The synthetic procedures for these ligands

496

The splitting of hyperfine lines of57Fe nuclei in RF magnetic field  

Science Journals Connector (OSTI)

It is shown experimentally, that for Moessbauer nuclei affected by the radio-frequency (RF) magnetic field of sufficient intensity at frequencies corresponding to ... occurs. Depending on the frequency of alterna...

F. G. Vagizov

1990-08-01T23:59:59.000Z

497

Sustained H2 Production Driven by Photosynthetic Water Splitting in a Unicellular Cyanobacterium  

Science Journals Connector (OSTI)

...suggest that carbohydrate consumption in the light may, at best...experiment, when carbohydrate consumption is negligible. These results...cylindrical borosilicate glass vessel housed within a custom-manufactured...Cyanothece 51142. Net carbohydrate consumption and H2 production under Ar-CO2...

Matthew R. Melnicki; Grigoriy E. Pinchuk; Eric A. Hill; Leo A. Kucek; Jim K. Fredrickson; Allan Konopka; Alexander S. Beliaev

2012-08-01T23:59:59.000Z

498

Support for Cost Analyses on Solar-Driven High Temperature Thermochemical Water-Splitting Cycles  

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

This report summarizes the application of chemical process flowsheet analyses and cash flow analyses using DOE's H2A methodology to develop near-term (2015) and longer-term (2025) cost projections for eight solar thermochemical hydrogen production reaction cycles.

499

Dynamics of photogenerated holes in surface modified ?-Fe2O3 photoanodes for solar water splitting  

Science Journals Connector (OSTI)

...efficient water oxidation electrocatalyst, and a Ga2O3 overlayer...being made in the development of suitable materials...of electrons in the cathode and achieve proton...ITO is an effective electrocatalyst, reducing the overpotential...that resulted in the development of a partial electron...

Monica Barroso; Camilo A. Mesa; Stephanie R. Pendlebury; Alexander J. Cowan; Takashi Hisatomi; Kevin Sivula; Michael Grätzel; David R. Klug; James R. Durrant

2012-01-01T23:59:59.000Z

500

Decoupled catalytic hydrogen evolution from a molecular metal oxide redox mediator in water splitting  

Science Journals Connector (OSTI)

...system that uses a carbon cathode to reduce protons and a...SiW 12 O 40 ] at a carbon cathode. Alternatively, starting from the fully oxidized...Nanostructured nickel phosphide as an electrocatalyst for the hydrogen evolution reaction . J...electrocatalysis to stack development . Int. J. Hydrogen Energy...

Benjamin Rausch; Mark D. Symes; Greig Chisholm; Leroy Cronin

2014-09-12T23:59:59.000Z