National Library of Energy BETA

Sample records for tilted sr solar

  1. Tilt assembly for tracking solar collector assembly

    DOE Patents [OSTI]

    Almy, Charles; Peurach, John; Sandler, Reuben

    2012-01-24

    A tilt assembly is used with a solar collector assembly of the type comprising a frame, supporting a solar collector, for movement about a tilt axis by pivoting a drive element between first and second orientations. The tilt assembly comprises a drive element coupler connected to the drive element and a driver, the driver comprising a drive frame, a drive arm and a drive arm driver. The drive arm is mounted to the drive frame for pivotal movement about a drive arm axis. Movement on the drive arm mimics movement of the drive element. Drive element couplers can extend in opposite directions from the outer portion of the drive arm, whereby the assembly can be used between adjacent solar collector assemblies in a row of solar collector assemblies.

  2. Measurement and modeling of solar irradiance components on horizontal and tilted planes

    SciTech Connect (OSTI)

    Padovan, Andrea; Col, Davide del

    2010-12-15

    In this work new measurements of global and diffuse solar irradiance on the horizontal plane and global irradiance on planes tilted at 20 and 30 oriented due South and at 45 and 65 oriented due East are used to discuss the modeling of solar radiation. Irradiance data are collected in Padova (45.4 N, 11.9 E, 12 m above sea level), Italy. Some diffuse fraction correlations have been selected to model the hourly diffuse radiation on the horizontal plane. The comparison with the present experimental data shows that their prediction accuracy strongly depends on the sky characteristics. The hourly irradiance measurements taken on the tilted planes are compared with the estimations given by one isotropic and three anisotropic transposition models. The use of an anisotropic model, based on a physical description of the diffuse radiation, provides a much better accuracy, especially when measurements of the diffuse irradiance on the horizontal plane are not available and thus transposition models have to be applied in combination with a diffuse fraction correlation. This is particularly significant for the planes oriented away from South. (author)

  3. Effects of the scatter in sunspot group tilt angles on the large-scale magnetic field at the solar surface

    SciTech Connect (OSTI)

    Jiang, J.; Cameron, R. H.; Schüssler, M.

    2014-08-10

    The tilt angles of sunspot groups represent the poloidal field source in Babcock-Leighton-type models of the solar dynamo and are crucial for the build-up and reversals of the polar fields in surface flux transport (SFT) simulations. The evolution of the polar field is a consequence of Hale's polarity rules, together with the tilt angle distribution which has a systematic component (Joy's law) and a random component (tilt-angle scatter). We determine the scatter using the observed tilt angle data and study the effects of this scatter on the evolution of the solar surface field using SFT simulations with flux input based upon the recorded sunspot groups. The tilt angle scatter is described in our simulations by a random component according to the observed distributions for different ranges of sunspot group size (total umbral area). By performing simulations with a number of different realizations of the scatter we study the effect of the tilt angle scatter on the global magnetic field, especially on the evolution of the axial dipole moment. The average axial dipole moment at the end of cycle 17 (a medium-amplitude cycle) from our simulations was 2.73 G. The tilt angle scatter leads to an uncertainty of 0.78 G (standard deviation). We also considered cycle 14 (a weak cycle) and cycle 19 (a strong cycle) and show that the standard deviation of the axial dipole moment is similar for all three cycles. The uncertainty mainly results from the big sunspot groups which emerge near the equator. In the framework of Babcock-Leighton dynamo models, the tilt angle scatter therefore constitutes a significant random factor in the cycle-to-cycle amplitude variability, which strongly limits the predictability of solar activity.

  4. Strain Accommodation By Facile WO6 Octahedral Distortion and Tilting During WO3 Heteroepitaxy on SrTiO3(001)

    SciTech Connect (OSTI)

    Du, Yingge; Gu, Meng; Varga, Tamas; Wang, Chong M.; Bowden, Mark E.; Chambers, Scott A.

    2014-08-27

    In this paper, we show that compared to other BO6 octahedra in ABO3 structured perovskite oxides, the WO6 octahedra in tungsten trioxide (WO3) can withstand a much larger degree of distortion and tilting to accommodate interfacial strain, which in turn strongly impact the nucleation, structure, and defect formation during the epitaxial growth of WO3 on SrTiO3(001). A meta-stable tetragonal phase can be stabilized by epitaxy and a thickness dependent phase transition (tetragonal to monoclinic) is observed. In contrast to misfit dislocations to accommodate the interfacial stain, the facial WO6 octahedral distortion and tilting give rise to three types of planar defects that affect more than 15 monolayers from the interface. These atomically resolved, unusual interfacial defects may significantly alter the electronic, electrochromic, and mechanical properties of the epitaxial films.

  5. LANGEVIN DYNAMICS OF THE TWO STAGE MELTING TRANSITION OF VORTEX MATTER IN Bi{sub 2}Sr{sub 2}CaCu{sub 2}O{sub 8+{delta}} IN THE PRESENCE OF STRAIGHT AND OF TILTED COLUMNAR DEFECTS

    SciTech Connect (OSTI)

    GOLDSCHMIDT, YADIN Y.; LIU, Jin-Tao

    2007-08-07

    In this paper we use London Langevin molecular dynamics simulations to investigate the vortex matter melting transition in the highly anisotropic high-temperature superconductor material Bi{sub 2}Sr{sub 2}CaCu{sub 2}O{sub 8+{delta}}#14; in the presence of low concentration of columnar defects (CDs). We reproduce with further details our previous results obtained by using Multilevel Monte Carlo simulations that showed that the melting of the nanocrystalline vortex matter occurs in two stages: a first stage melting into nanoliquid vortex matter and a second stage delocalization transition into a homogeneous liquid. Furthermore, we report on new dynamical measurements in the presence of a current that identifies clearly the irreversibility line and the second stage delocalization transition. In addition to CDs aligned along the c-axis we also simulate the case of tilted CDs which are aligned at an angle with respect to the applied magnetic field. Results for CDs tilted by 45{degree} with respect to c-axis show that the locations of the melting and delocalization transitions are not affected by the tilt when the ratio of flux lines to CDs remains constant. On the other hand we argue that some dynamical properties and in particular the position of the irreversibility line should be affected.

  6. Tilted fuel cell apparatus

    DOE Patents [OSTI]

    Cooper, John F.; Cherepy, Nerine; Krueger, Roger L.

    2005-04-12

    Bipolar, tilted embodiments of high temperature, molten electrolyte electrochemical cells capable of directly converting carbon fuel to electrical energy are disclosed herein. The bipolar, tilted configurations minimize the electrical resistance between one cell and others connected in electrical series. The tilted configuration also allows continuous refueling of carbon fuel.

  7. (Sr,Ba)(Si,Ge){sub 2} for thin-film solar-cell applications: First-principles study

    SciTech Connect (OSTI)

    Kumar, Mukesh E-mail: mkgarg79@gmail.com; Umezawa, Naoto; Imai, Motoharu

    2014-05-28

    In order to meet the increasing demand for electric power generation from solar energy conversion, the development of efficient light absorber materials has been awaited. To this end, the electronic and optical properties of advanced alkaline-earth-metals disilicides and digermanides (SrSi{sub 2}, BaSi{sub 2}, SrGe{sub 2}, and BaGe{sub 2}) are studied by means of the density functional theory using HSE06 exchange-correlation energy functional. Our calculations show that all these orthorhombic structured compounds have fundamental indirect band gaps in the range E{sub g} ? 0.891.25 eV, which is suitable for solar cell applications. The estimated lattice parameters and band gaps are in good agreement with experiments. Our calculations show that the electronic band structures of all four compounds are very similar except in the vicinity of the ?-point. The valence band of these compounds is made up by Si(Ge)-p states, whereas the conduction band is composed of Sr(Ba)-d states. Their band alignments are carefully determined by estimating the work function of each compound using slab model. The optical properties are discussed in terms of the complex dielectric function ?(?)?=??{sub 1}(?)?+?i?{sub 2}(?). The static and high-frequency dielectric constants are calculated, taking into account the ionic contribution. The absorption coefficient ?(?) demonstrates that a low energy dispersion of the conduction band, which results in a flat conduction band minimum, leads to large optical activity in these compounds. Therefore, alkaline-earth-metals disilicides and digermanides possess great potential as light absorbers for applications in thin-film solar cell technologies.

  8. IDENTIFICATION OF AN {sup 84}Sr-DEPLETED CARRIER IN PRIMITIVE METEORITES AND IMPLICATIONS FOR THERMAL PROCESSING IN THE SOLAR PROTOPLANETARY DISK

    SciTech Connect (OSTI)

    Paton, Chad; Schiller, Martin; Bizzarro, Martin E-mail: schiller@snm.ku.dk

    2013-02-01

    The existence of correlated nucleosynthetic heterogeneities in solar system reservoirs is now well demonstrated for numerous nuclides. However, it has proven difficult to discriminate between the two disparate processes that can explain such correlated variability: incomplete mixing of presolar material or secondary processing of a well-mixed disk. Using stepwise acid-leaching of the Ivuna CI-chondrite, we show that unlike other nuclides such as {sup 54}Cr and {sup 50}Ti, Sr-isotope variability is the result of a carrier depleted in {sup 84}Sr. The carrier is most likely presolar SiC, which is known to have both high Sr-concentrations relative to solar abundances and extremely depleted {sup 84}Sr compositions. Thus, variability in {sup 84}Sr in meteorites and their components can be attributed to varying contributions from presolar SiC. The observed {sup 84}Sr excesses in calcium-aluminum refractory inclusions (CAIs) suggest their formation from an SiC-free gaseous reservoir, whereas the {sup 84}Sr depletions present in differentiated meteorites require their formation from material with an increased concentration of SiC relative to CI chondrites. The presence of a positive correlation between {sup 84}Sr and {sup 54}Cr, despite being hosted in carriers of negative and positive anomalies, respectively, is not compatible with incomplete mixing of presolar material but instead suggests that the solar system's nucleosynthetic heterogeneity reflects selective thermal processing of dust. Based on vaporization experiments of SiC under nebular conditions, the lack of SiC material in the CAI-forming gas inferred from our data requires that the duration of thermal processing of dust resulting in the vaporization of CAI precursors was extremely short-lived, possibly lasting only hours to days.

  9. File:NREL-bhutan-10kmsolar-tilt.pdf | Open Energy Information

    Open Energy Info (EERE)

    File File history File usage Bhutan - Annual - Flat PlateTilted at Latitude Solar Radiation Size of this preview: 776 600 pixels. Full resolution (1,650 1,275 pixels,...

  10. Belle Mead Solar Project | Open Energy Information

    Open Energy Info (EERE)

    Jump to: navigation, search Name Belle Mead Solar Project Facility Belle Mead Solar Project Sector Solar Facility Type Ground-mount fixed tilt solar array Owner EnXco Developer...

  11. Sacramento Municipal Utility District Solar Array | Open Energy...

    Open Energy Info (EERE)

    Municipal Utility District Solar Array Sector Solar Facility Type Ground-mounted fixed tilt Owner EnXco Developer EnXco Energy Purchaser Sacramento Municipal Utility District...

  12. Sun Harvest Solar Project | Open Energy Information

    Open Energy Info (EERE)

    Solar Project Facility Sun Harvest Solar Project Sector Solar Facility Type Fixed Tilt Ground-Mount Owner EnXco Developer EnXco Energy Purchaser Fresno Adventist Academy...

  13. SR0204

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

    2 Media Contact: Julie Petersen (803) 725-2889 Allison Named DOE-SR Acting Manager Flag Ribbon Art AIKEN, SC; July 1 - Assistant Secretary for Environmental Management Jessie H. Roberson recently announced the designation of Jeffrey M. Allison as Acting Manager for the Department of Energy (DOE) Savannah River Operations Office (SR). Mr. Allison is a career member of the Senior Executive Service with over 19 years of experience in engineering, safety, health, process development, and management

  14. SR0208

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

    , 2002 Media Contact: Julie Petersen (803) 725-2889 DOE-SR Announces Release Of SRS History Book Flag Ribbon Art Aiken, SC - Today the Department of Energy (DOE) Savannah River Operations Office (SR) released the comprehensive, technical history of the Savannah River Site (SRS), Savannah River Site at Fifty. The book chronicles the design, construction, and operation of SRS in South Carolina from 1950-2000. Savannah River Site at Fifty explores the events leading up to the decision to create the

  15. SR9903

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

    22, 1999 Media Contact: Julie Petersen (803) 725-2889 DOE-SR To Prepare Supplemental Environmental Impact Statement On High-Level Waste System Alternatives Flag Ribbon Art AIKEN, SC; February 22 -Today the Department of Energy (DOE) Savannah River Operations Office (SR) issued a Notice of Intent to prepare a Supplemental Environmental Impact Statement (SEIS) on the proposed replacement of the existing In-Tank Precipitation (ITP) process at the Savannah River Site (SRS). Replacement of the

  16. RE-EXAMINING SUNSPOT TILT ANGLE TO INCLUDE ANTI-HALE STATISTICS

    SciTech Connect (OSTI)

    McClintock, B. H.; Norton, A. A.; Li, J. E-mail: aanorton@stanford.edu

    2014-12-20

    Sunspot groups and bipolar magnetic regions (BMRs) serve as an observational diagnostic of the solar cycle. We use Debrecen Photohelographic Data (DPD) from 1974-2014 that determined sunspot tilt angles from daily white light observations, and data provided by Li and Ulrich that determined sunspot magnetic tilt angle using Mount Wilson magnetograms from 1974-2012. The magnetograms allowed for BMR tilt angles that were anti-Hale in configuration, so tilt values ranged from 0 to 360° rather than the more common ±90°. We explore the visual representation of magnetic tilt angles on a traditional butterfly diagram by plotting the mean area-weighted latitude of umbral activity in each bipolar sunspot group, including tilt information. The large scatter of tilt angles over the course of a single cycle and hemisphere prevents Joy's law from being visually identified in the tilt-butterfly diagram without further binning. The average latitude of anti-Hale regions does not differ from the average latitude of all regions in both hemispheres. The distribution of anti-Hale sunspot tilt angles are broadly distributed between 0 and 360° with a weak preference for east-west alignment 180° from their expected Joy's law angle. The anti-Hale sunspots display a log-normal size distribution similar to that of all sunspots, indicating no preferred size for anti-Hale sunspots. We report that 8.4% ± 0.8% of all bipolar sunspot regions are misclassified as Hale in traditional catalogs. This percentage is slightly higher for groups within 5° of the equator due to the misalignment of the magnetic and heliographic equators.

  17. Large optics inspection, tilting, and washing stand

    DOE Patents [OSTI]

    Ayers, Marion Jay; Ayers, Shannon Lee

    2010-08-24

    A large optics stand provides a risk free means of safely tilting large optics with ease and a method of safely tilting large optics with ease. The optics are supported in the horizontal position by pads. In the vertical plane the optics are supported by saddles that evenly distribute the optics weight over a large area.

  18. Large optics inspection, tilting, and washing stand

    DOE Patents [OSTI]

    Ayers, Marion Jay; Ayers, Shannon Lee

    2012-10-09

    A large optics stand provides a risk free means of safely tilting large optics with ease and a method of safely tilting large optics with ease. The optics are supported in the horizontal position by pads. In the vertical plane the optics are supported by saddles that evenly distribute the optics weight over a large area.

  19. Black River Farm Solar Project | Open Energy Information

    Open Energy Info (EERE)

    Solar Project Facility Black River Farm Solar Project Sector Solar Facility Type Fixed Tilt Ground-Mount & Roof-Mount Owner EnXco Developer EnXco Energy Purchaser Black River Farm...

  20. solar power | National Nuclear Security Administration

    National Nuclear Security Administration (NNSA)

    in California was installed last week. When complete, the 3.3 MW fixed-tilt solar photovoltaic facility will represent the largest DOENNSA purchase of solar energy from an onsite

  1. SR0014

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

    November 30, 2000 Media Contact: Jim Giusti (803) 725-2889 Draft EIS Issued On Future Closures Of SRS High-Level Waste Tanks Flag Ribbon Graphic AIKEN, SC; November 30 - The Department of Energy (DOE) Savannah River Operations Office (SR) has published for public review and comment the Draft Environmental Impact Statement (EIS) on the proposed closing of additional high-level waste (HLW) tanks at the Savannah River Site (SRS). DOE-SR proposes to close the tank systems to protect human health and

  2. SR0207

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

    30, 2002 Media Contact: Julie Petersen (803) 725-2889 Notice To Editors: DOE Releases SRS History Book Flag Ribbon Art WHO: U.S. Department of Energy (DOE) Savannah River Operations Office (SR) Acting Manager Jeffrey Allison will publicly release the recently published technical history of the Savannah River Site (SRS), SRS at Fifty. WHAT: Brief event involving local students and DOE-SR Acting Manager. WHEN: Wednesday, October 2, 2002, at 2:00 PM. WHERE: New Ellenton Middle School; SC Highway

  3. SR0706

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

    4, 2007 Media Contact: James Giusti (803) 952-7697 james-r.giusti@srs.gov DOE Honors Hepner as Federal Small Business Manger of the Year AIKEN, S.C., – David W. Hepner, Sr., Community Affairs/Small Business Program Manager for the U.S. Department of Energy (DOE) Savannah River Operations Office (SR) was recently honored as the Federal Small Business Manager of the Year for his dedication and high achievement to encourage small business participation in Fiscal Year 2006. Winners of DOE’s 2006

  4. An Acoustic Wave Equation for Tilted Transversely Isotropic Media...

    Office of Scientific and Technical Information (OSTI)

    An Acoustic Wave Equation for Tilted Transversely Isotropic Media Citation Details In-Document Search Title: An Acoustic Wave Equation for Tilted Transversely Isotropic Media ...

  5. Spin transport in tilted electron vortex beams

    SciTech Connect (OSTI)

    Basu, Banasri; Chowdhury, Debashree

    2014-12-10

    In this paper we have enlightened the spin related issues of tilted Electron vortex beams. We have shown that in the skyrmionic model of electron we can have the spin Hall current considering the tilted type of electron vortex beam. We have considered the monopole charge of the tilted vortex as time dependent and through the time variation of the monopole charge we can explain the spin Hall effect of electron vortex beams. Besides, with an external magnetic field we can have a spin filter configuration.

  6. Solar

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

    Energy & Climate Secure & Sustainable Energy Future Stationary Power Energy Conversion Efficiency Solar Energy Wind Energy Water Power Supercritical CO2 Geothermal Natural Gas ...

  7. Solar

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

    Sandia Home Locations Contact Us Employee Locator Energy & Climate Secure & Sustainable Energy Future Stationary Power Energy Conversion Efficiency Solar Energy Wind Energy Water ...

  8. Solar

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

    Secure & Sustainable Energy Future Stationary Power Energy Conversion Efficiency Solar Energy Wind Energy Water Power Supercritical CO2 Geothermal Natural Gas Safety, Security & ...

  9. SR0008

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

    Wachenhut Receives Award Fee Flag Ribbon Art Note to Editors and News Directors The Department of Energy (DOE) has determined the performance award fee earned by Wackenhut Services, Incorporated, for the evaluation period October 1, 1999, through March 31, 2000. A copy of the letter announcing DOE's award fee determination can be obtained by calling (803) 725-2889. -DOE- SR-00-08

  10. SR0106

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

    31, 2001 Media Contact: Rick Ford (803) 725-2889 DOE Announces Wackenhut Services Inc. Award Fee Flag Ribbon Art Note To Editors and News Directors: The Department of Energy (DOE) has determined the performance award fee earned by Wackenhut Services, Incorporated, for the evaluation period October 1, 2000, through March 31, 2001. -DOE- SR-01-06

  11. SR0302

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

    8, 2003 Media Contact: Rick Ford (803) 725-2889 DOE Announces WSI Award Fee Flag Ribbon Art The Department of Energy (DOE) has determined the performance award fee earned by Wackenhut Services, Incorporated, for the evaluation period October 1, 2002, through March 31, 2003. The letter announcing DOE's award fee determination is available by calling (803)725-2889. -DOE- SR-03

  12. Photovoltaic solar cell

    SciTech Connect (OSTI)

    Nielson, Gregory N.; Gupta, Vipin P.; Okandan, Murat; Watts, Michael R.

    2015-09-08

    A photovoltaic solar concentrator is disclosed with one or more transverse-junction solar cells (also termed point contact solar cells) and a lens located above each solar cell to concentrate sunlight onto the solar cell to generate electricity. Piezoelectric actuators tilt or translate each lens to track the sun using a feedback-control circuit which senses the electricity generated by one or more of the solar cells. The piezoelectric actuators can be coupled through a displacement-multiplier linkage to provide an increased range of movement of each lens. Each lens in the solar concentrator can be supported on a frame (also termed a tilt plate) having three legs, with the movement of the legs being controlled by the piezoelectric actuators.

  13. Photovoltaic solar concentrator

    DOE Patents [OSTI]

    Nielson, Gregory N.; Gupta, Vipin P.; Okandan, Murat; Watts, Michael R.

    2016-03-15

    A photovoltaic solar concentrator is disclosed with one or more transverse-junction solar cells (also termed point contact solar cells) and a lens located above each solar cell to concentrate sunlight onto the solar cell to generate electricity. Piezoelectric actuators tilt or translate each lens to track the sun using a feedback-control circuit which senses the electricity generated by one or more of the solar cells. The piezoelectric actuators can be coupled through a displacement-multiplier linkage to provide an increased range of movement of each lens. Each lens in the solar concentrator can be supported on a frame (also termed a tilt plate) having three legs, with the movement of the legs being controlled by the piezoelectric actuators.

  14. Photovoltaic solar concentrator

    DOE Patents [OSTI]

    Nielson, Gregory N.; Okandan, Murat; Resnick, Paul J.; Cruz-Campa, Jose Luis

    2012-12-11

    A photovoltaic solar concentrator is disclosed with one or more transverse-junction solar cells (also termed point contact solar cells) and a lens located above each solar cell to concentrate sunlight onto the solar cell to generate electricity. Piezoelectric actuators tilt or translate each lens to track the sun using a feedback-control circuit which senses the electricity generated by one or more of the solar cells. The piezoelectric actuators can be coupled through a displacement-multiplier linkage to provide an increased range of movement of each lens. Each lens in the solar concentrator can be supported on a frame (also termed a tilt plate) having three legs, with the movement of the legs being controlled by the piezoelectric actuators.

  15. SR0004

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

    5, 1999 Media Contact: James R. Giusti (803) 725-2889 DOE Releases Accident Investigation Report On FB-Line Workers' Plutonium Intake Flag Ribbon Art Aiken, SC - The Department of Energy's Savannah River Operations Office (SR) today issued its Accident Investigation Board's findings on the cause of plutonium intakes by seven Savannah River Site (SRS) employees in the FB-Line facility. On September 1, 1999, plutonium was released from a failed plutonium storage canister at the Site's FB-Line

  16. SR0009

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

    June 8, 2000 Media Contact: Rick Ford (803) 725-2889 WSRC Receives Award Fee Flag Ribbon Art Note to Editors and News Directors The Department of Energy (DOE) has determined the performance award fee earned by Westinghouse Savannah River Company for the evaluation period October 1, 1999, through March 31, 2000. To obatin a copy of the letter announcing DOE's award fee determination click here or call (803) 725-2889 -DOE- SR-00-08

  17. SR0013

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

    25, 2000 Media Contact: Rick Ford (803) 725-2889 Savannah River Operations Office Wins Best Practices Award Flag Ribbon Graphic The Department of Energy's Savannah River Operations Office (SR) has received the FY2000 "Human Resources/Equal Employment Opportunity Best Practices" Award from the Federal Personnel Management Institute (FPMI). The award is presented annually by FPMI to a single Federal organization that has "demonstrated outstanding innovation and creativity in

  18. SR0015

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

    , 2000 Media Contact: Jim Giusti (803) 725-2889 WSRC Receives Award Fee Flag Ribbon Graphic Note to Editors and News Directors The Department of Energy (DOE) has determined the performance award fee earned by Westinghouse Savannah River Company for the evaluation period April 1, 2000, through September 30, 2000. To obatin a copy of the letter announcing DOE's award fee determination click here or call (803) 725-2889 -DOE- SR-00-15 | Back |

  19. SR0018

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

    Rick Ford (803) 725-2889 Wackenhut Receives Award Fee Flag Ribbon Graphic The Department of Energy (DOE) has determined the performance award fee earned by Wackenhut Services, Incorporated, for the evaluation period April 1, 2000, through September 30, 2000. To obatin a copy of the letter announcing DOE's award fee determination click here or call (803) 725-2889. -DOE- SR-00-18

  20. SR0102

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

    30, 2001 Media Contact: Julie Petersen (803) 725-2889 DOE Annouces Availability of Draf SEIS On Salt PRocessing Alternatives Flag Ribbon Art Aiken, SC -- Today the Department of Energy (DOE) Savannah River Operations Office (SR) announces the availability of a Draft Supplemental Environmental Impact Statement (EIS) which evaluates alternatives for separating the high-activity and low-activity salt waste from the liquid high-level radioactive waste now stored in underground tanks at the Savannah

  1. SR0105

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

    4, 2001 Media Contact: Julie Petersen (803) 725-2889 Doe Announces Availability Of Draft RFP On Salt Waste Processing Facility Flag Ribbon Art Aiken, SC; May 24, 2001 -- Today the Department of Energy (DOE) Savannah River Operations Office (SR) announced in the Commerce Business Daily the availability of the Draft Request for Proposals (RFP) for the acquisition of services to design, construct, and commission a facility to process the salt fraction of high-level radioactive waste currently

  2. SR0109

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

    0, 2001 Media Contact: Julie Petersen (803) 725-2889 DOE ANNOUNCES AVAILABILITY OF FINAL SUPPLEMENTAL EIS AND IDENTIFIES PREFERRED SALT PROCESSING ALTERNATIVE Flag Ribbon Art AIKEN, SC; July 20 -Today the Department of Energy (DOE) Savannah River Operations Office (SR) announced the availability of the Savannah River Site Salt Processing Alternatives Final Supplemental Environmental Impact Statement (EIS). Based on DOE's evaluation of research results and comments received on the Draft

  3. SR0305

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

    2, 2003 Media Contact: Jim Giusti (803) 725-2889 DOE Hosts Public Workshops on Historical Preservation of SRS' Cold War Resources Flag Ribbon Art Aiken, SC - The Department of Energy's Savannah River Operations Office (DOE-SR) will host this month two public information workshops & seek public comments on the preservation of historical "Cold War" resources at SRS. As part of its compliance with the National Historic Preservation Act (NHPA) of 1966 (as amended), the Department will

  4. SR9805

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

    16, 1999 Media Contact: Rick Ford (803) 725-2889 WSCR Receives Award Fee Flag Ribbon Art The Department of Energy (DOE) has determined the performance award fees earned by Westinghouse Savannah River Company for the evaluation period October 1, 1998, through March 31, 1999. The letter announcing DOE's award fee determination is available by calling (803)725-2889. -DOE- SR-98-05

  5. SR9910

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

    2, 1999 Media Contact: Bill Taylor (803) 725-2889 Wackenhut Receives Award Fee Flag Ribbon Art Note to Editors and News Directors The Department of Energy (DOE) has determined the performance award fee earned by Wackenhut Services, Incorporated, for the evaluation period January 25, 1999 through May 31, 1999. The letter announcing DOE’s award fee determination is available by calling (803) 725-2889 -DOE- SR-99-10 | Back |

  6. SR9917

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

    6, 1999 Media Contact: Rick Ford (803) 725-2889 WSCR Receives Award Fee Flag Ribbon Art The Department of Energy (DOE) has determined the performance award fees earned by Westinghouse Savannah River Company for the evaluation period April 1, 1999, through September 30, 1999. The letter announcing DOE's award fee determination is available by calling (803)725-2889. -DOE- SR-99-17

  7. solar

    National Nuclear Security Administration (NNSA)

    2%2A en Solar power purchase for DOE laboratories http:nnsa.energy.govmediaroompressreleasessolarpower

  8. Combined Scanning Transmission Electron Microscopy Tilt- and Focal Series

    SciTech Connect (OSTI)

    Dahmen, Tim; Baudoin, Jean-Pierre G; Lupini, Andrew R; Kubel, Christian; Slusallek, Phillip; De Jonge, Niels

    2014-01-01

    In this study, a combined tilt- and focal series is proposed as a new recording scheme for high-angle annular dark-field scanning transmission electron microscopy (STEM) tomography. Three-dimensional (3D) data were acquired by mechanically tilting the specimen, and recording a through-focal series at each tilt direction. The sample was a whole-mount macrophage cell with embedded gold nanoparticles. The tilt focal algebraic reconstruction technique (TF-ART) is introduced as a new algorithm to reconstruct tomograms from such combined tilt- and focal series. The feasibility of TF-ART was demonstrated by 3D reconstruction of the experimental 3D data. The results were compared with a conventional STEM tilt series of a similar sample. The combined tilt- and focal series led to smaller missing wedge artifacts, and a higher axial resolution than obtained for the STEM tilt series, thus improving on one of the main issues of tilt series-based electron tomography.

  9. Final row of solar panels installed at Livermore | National Nuclear...

    National Nuclear Security Administration (NNSA)

    When complete, the 3.3 MW fixed-tilt solar photovoltaic facility will represent the largest DOENNSA purchase of solar energy from an onsite facility. Electrical installation will ...

  10. Unit-cell thick BaTiO{sub 3} blocks octahedral tilt propagation across oxide heterointerface

    SciTech Connect (OSTI)

    Kan, Daisuke Aso, Ryotaro; Kurata, Hiroki; Shimakawa, Yuichi

    2014-05-14

    We fabricated SrRuO{sub 3}/BaTiO{sub 3}/GdScO{sub 3} heterostructures in which the BaTiO{sub 3} layer is one unit cell thick by pulsed laser deposition and elucidated how the BaTiO{sub 3} layer influences structural and magneto-transport properties of the SrRuO{sub 3} layer through octahedral connections across the heterointerface. Our X-ray-diffraction-based structural characterizations show that while an epitaxial SrRuO{sub 3} layer grown directly on a GdScO{sub 3} substrate is in the monoclinic phase with RuO{sub 6} octahedral tilts, a one-unit-cell-thick BaTiO{sub 3} layer inserted between SrRuO{sub 3} and GdScO{sub 3} stabilizes the tetragonal SrRuO{sub 3} layer with largely reduced RuO{sub 6} tilts. Our high-angle annular dark-field and annular bright-field scanning transmission electron microscopy observations provide an atomic-level view of the octahedral connections across the heterostructure and reveal that the BaTiO{sub 3} layer only one unit cell thick is thick enough to stabilize the RuO{sub 6}-TiO{sub 6} octahedral connections with negligible in-plane oxygen atomic displacements. This results in no octahedral tilts propagating into the SrRuO{sub 3} layer and leads to the formation of a tetragonal SrRuO{sub 3} layer. The magneto-transport property characterizations also reveal a strong impact of the octahedral connections modified by the inserted BaTiO{sub 3} layer on the spin-orbit interaction of the SrRuO{sub 3} layer. The SrRuO{sub 3} layer on BaTiO{sub 3}/ GdScO{sub 3} has in-plane magnetic anisotropy. This is in contrast to the magnetic anisotropy of the monoclinic SrRuO{sub 3} films on the GdScO{sub 3} substrate, in which the easy axis is ?45 to the film surface normal. Our results demonstrate that the one-unit-cell-thick layer of BaTiO{sub 3} can control and manipulate the interfacial octahedral connection closely linked to the structure-property relationship of heterostructures.

  11. File:NREL-africa-tilt.pdf | Open Energy Information

    Open Energy Info (EERE)

    tilt.pdf Jump to: navigation, search File File history File usage Africa - Annual Flat Plate Tilted at Latitude (PDF) Size of this preview: 776 600 pixels. Full resolution...

  12. A Method of Correcting for Tilt From Horizontal in Downwelling Shortwave Irradiance Measurements on Moving Platforms

    SciTech Connect (OSTI)

    Long, Charles N.; Bucholtz, Anthony; Jonsson, Haf; Schmid, Beat; Vogelmann, A. M.; Wood, John

    2010-04-14

    Significant errors occur in downwelling shortwave irradiance measurements made on moving platforms due to tilt from horizontal because, when the sun is not completely blocked by overhead cloud, the downwelling shortwave irradiance has a prominent directional component from the direct sun. A-priori knowledge of the partitioning between the direct and diffuse components of the total shortwave irradiance is needed to properly apply a correction for tilt. This partitioning information can be adequately provided using a newly available commercial radiometer that produces reasonable measurements of the total and diffuse shortwave irradiance, and by subtraction the direct shortwave irradiance, with no moving parts and regardless of azimuthal orientation. We have developed methodologies for determining the constant pitch and roll offsets of the radiometers for aircraft applications, and for applying a tilt correction to the total shortwave irradiance data. Results suggest that the methodology is for tilt up to +/-10°, with 90% of the data corrected to within 10 Wm-2 at least for clear-sky data. Without a proper tilt correction, even data limited to 5° of tilt as is typical current practice still exhibits large errors, greater than 100 Wm-2 in some cases. Given the low cost, low weight, and low power consumption of the SPN1 total and diffuse radiometer, opportunities previously excluded for moving platform measurements such as small Unmanned Aerial Vehicles and solar powered buoys now become feasible using our methodology. The increase in measurement accuracy is important, given current concerns over long-term climate variability and change especially over the 70% of the Earth’s surface covered by ocean where long-term records of these measurements are sorely needed and must be made on ships and buoys.

  13. Prediction of tilted capillary barrier performance

    SciTech Connect (OSTI)

    Webb, S.W.; McCord, J.T.; Dwyer, S.F.

    1997-04-01

    Capillary barriers, consisting of tilted fine-over-coarse layers under unsaturated conditions, have been suggested as landfill covers to divert water infiltration away from sensitive underground regions, especially for arid and semi-arid regions. The Hydrological Evaluation of Landfill Performance (HELP) computer code is an evaluation tool for landfill covers used by designers and regulators. HELP is a quasi-two-dimensional model that predicts moisture movement into and through the underground soil and waste layers. Processes modeled within HELP include precipitation, runoff, evapotranspiration, unsaturated vertical drainage, saturated lateral drainage, and leakage through liners. Unfortunately, multidimensional unsaturated flow phenomena that are necessary for evaluating tilted capillary barriers are not included in HELP. Differences between the predictions of the HELP and those from a multidimensional unsaturated flow code are presented to assess the two different approaches. Comparisons are presented for the landfill covers including capillary barrier configurations at the Alternative Landfill Cover Demonstration (ALCD) being conducted at Sandia.

  14. Stabilizing windings for tilting and shifting modes

    DOE Patents [OSTI]

    Jardin, Stephen C.; Christensen, Uffe R.

    1984-01-01

    This invention relates to passive conducting loops for stabilizing a plasma ring against unstable tilting and/or shifting modes. To this end, for example, plasma ring in a spheromak is stabilized by a set of four figure-8 shaped loops having one pair on one side of the plasma and one pair on the other side with each pair comprising two loops whose axes are transverse to each other.

  15. TILT, WARP, AND SIMULTANEOUS PRECESSIONS IN DISKS

    SciTech Connect (OSTI)

    Montgomery, M. M.

    2012-07-10

    Warps are suspected in disks around massive compact objects. However, the proposed warping source-non-axisymmetric radiation pressure-does not apply to white dwarfs. In this Letter, we report the first smoothed particle hydrodynamic simulations of accretion disks in SU UMa-type systems that naturally tilt, warp, and simultaneously precess in the prograde and retrograde directions using white dwarf V344 Lyrae in the Kepler field as our model. After {approx}79 days in V344 Lyrae, the disk angular momentum L{sub d} becomes misaligned to the orbital angular momentum L{sub o} . As the gas stream remains normal to L{sub o} , hydrodynamics (e.g., the lift force) is a likely source to disk tilt. In addition to tilt, the outer disk annuli cyclically change shape from circular to highly eccentric due to tidal torques by the secondary star. The effect of simultaneous prograde and retrograde precession is a warp of the colder, denser midplane as seen along the disk rim. The simulated rate of apsidal advance to nodal regression per orbit nearly matches the observed ratio in V344 Lyrae.

  16. An Acoustic Wave Equation for Tilted Transversely Isotropic Media...

    Office of Scientific and Technical Information (OSTI)

    Citation Details In-Document Search Title: An Acoustic Wave Equation for Tilted Transversely Isotropic Media A finite-difference method for computing the first arrival traveltimes ...

  17. File:NREL-afg-10km-tilt.pdf | Open Energy Information

    Open Energy Info (EERE)

    tilt.pdf Jump to: navigation, search File File history File usage Afghanistan - Annual Flat Plate Tilted at Latitude Size of this preview: 776 600 pixels. Full resolution...

  18. © Copyright 2013, First Solar, Inc

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

    Sandia National Laboratories is a multi-program laboratory managed and operated by Sandia Corporation, a wholly owned subsidiary of Lockheed Martin Corporation, for the U.S. Department of Energy's National Nuclear Security Administration under contract DE-AC04-94AL85000. SAND2014-15017PE 2 © Copyright 2013, First Solar, Inc. Summary * Estimations of POA irradiance are evaluated for tilt angles/orientations that are relevant to fixed tilt PV systems covering different climates in North America.

  19. Reconciliation of local and long range tilt correlations in underdoped...

    Office of Scientific and Technical Information (OSTI)

    powder diffraction and inelastic neutron scattering (INS) approaches. Long-range and static CuO tilt order with orthogonally inequivalent Cu-O bonds in the CuO planes in...

  20. So You Want to Go Solar? 3 Things to Consider When Installing Solar Power

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

    at Home | Department of Energy So You Want to Go Solar? 3 Things to Consider When Installing Solar Power at Home So You Want to Go Solar? 3 Things to Consider When Installing Solar Power at Home October 3, 2014 - 12:37pm Q&A What do you want to know about solar energy at home? Tell Us Addthis Installing solar panels requires the proper orientation and tilt, and it is best to use a professional contractor. | Photo courtesy of Dennis Schroeder, National Renewable Energy Laboratory

  1. Solar and Photovoltaic Data from the University of Oregon Solar Radiation Monitoring Laboratory (UO SRML)

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

    The UO SRML is a regional solar radiation data center whose goal is to provide sound solar resource data for planning, design, deployment, and operation of solar electric facilities in the Pacific Northwest. The laboratory has been in operation since 1975. Solar data includes solar resource maps, cumulative summary data, daily totals, monthly averages, single element profile data, parsed TMY2 data, and select multifilter radiometer data. A data plotting program and other software tools are also provided. Shade analysis information and contour plots showing the effect of tilt and orientation on annual solar electric system perfomance make up a large part of the photovoltaics data.(Specialized Interface)

  2. Method to fabricate a tilted logpile photonic crystal

    DOE Patents [OSTI]

    Williams, John D.; Sweatt, William C.

    2010-10-26

    A method to fabricate a tilted logpile photonic crystal requires only two lithographic exposures and does not require mask repositioning between exposures. The mask and photoresist-coated substrate are spaced a fixed and constant distance apart using a spacer and the stack is clamped together. The stack is then tilted at a crystallographic symmetry angle (e.g., 45 degrees) relative to the X-ray beam and rotated about the surface normal until the mask is aligned with the X-ray beam. The stack is then rotated in plane by a small stitching angle and exposed to the X-ray beam to pattern the first half of the structure. The stack is then rotated by 180.degree. about the normal and a second exposure patterns the remaining half of the structure. The method can use commercially available DXRL scanner technology and LIGA processes to fabricate large-area, high-quality tilted logpile photonic crystals.

  3. Tilted dipole model for bias-dependent photoluminescence pattern

    SciTech Connect (OSTI)

    Fujieda, Ichiro Suzuki, Daisuke; Masuda, Taishi

    2014-12-14

    In a guest-host system containing elongated dyes and a nematic liquid crystal, both molecules are aligned to each other. An external bias tilts these molecules and the radiation pattern of the system is altered. A model is proposed to describe this bias-dependent photoluminescence patterns. It divides the liquid crystal/dye layer into sub-layers that contain electric dipoles with specific tilt angles. Each sub-layer emits linearly polarized light. Its radiation pattern is toroidal and is determined by the tilt angle. Its intensity is assumed to be proportional to the power of excitation light absorbed by the sub-layer. This is calculated by the Lambert-Beer's Law. The absorption coefficient is assumed to be proportional to the cross-section of the tilted dipole moment, in analogy to the ellipsoid of refractive index, to evaluate the cross-section for each polarized component of the excitation light. Contributions from all the sub-layers are added to give a final expression for the radiation pattern. Self-absorption is neglected. The model is simplified by reducing the number of sub-layers. Analytical expressions are derived for a simple case that consists of a single layer with tilted dipoles sandwiched by two layers with horizontally-aligned dipoles. All the parameters except for the tilt angle can be determined by measuring transmittance of the excitation light. The model roughly reproduces the bias-dependent photoluminescence patterns of a cell containing 0.5?wt.?% coumarin 6. It breaks down at large emission angles. Measured spectral changes suggest that the discrepancy is due to self-absorption and re-emission.

  4. Effects of a tilted magnetic field in a Dirac double layer (Journal...

    Office of Scientific and Technical Information (OSTI)

    Effects of a tilted magnetic field in a Dirac double layer Citation Details In-Document Search Title: Effects of a tilted magnetic field in a Dirac double layer Authors: ...

  5. Strain relaxation in epitaxial SrRuO{sub 3} thin films on LaAlO{sub 3} substrates

    SciTech Connect (OSTI)

    Gao, M.; Du, H.; Dai, C.; Lin, Y.; Ma, C. R.; Liu, M.; Collins, G.; Zhang, Y. M.; Chen, C. L.

    2013-09-30

    Strain relaxation behavior of epitaxial SrRuO{sub 3} thin films on (001) LaAlO{sub 3} substrates was investigated using high resolution X-ray diffraction. Lattice distortion and dislocation densities were systematically studied with samples under different growth conditions. Reciprocal space maps reveal different strain relaxation behavior in SrRuO{sub 3} thin films grown at different temperatures. Two kinds of strain relaxation mechanisms were proposed to understand the growth dynamics, including the evolution of threading dislocations and the tilt of crystalline planes.

  6. EIS-0039: Motor Gasoline Deregulation and the Gasoline Tilt

    Office of Energy Efficiency and Renewable Energy (EERE)

    The Economic Regulatory Administration developed this EIS to evaluate the environmental impacts, including social and economic impacts, that may result from either of two proposed regulatory changes: (1) the exemption of motor gasoline from the Department of Energy's Mandatory Petroleum Price and Allocation Regulations, and (2) the adoption of the gasoline tilt, a proposed regulation that would allow refiners to recover an additional amount of their total increased costs on gasoline.

  7. SR0917.docx

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

    (803) 952-7697 Monday, August 10, 2009 james-r.giusti@srs.gov DOE Hosts Public Workshop On Energy Park Concept at the Savannah River Site Aiken, SC (Aug. 8) -- The Department of Energy's (DOE) Savannah River Operations Office (SR) will sponsor a four-hour workshop on the concept of an energy park at the Savannah River Site on August 18, 2009, at the North Augusta Municipal Center, 100 Georgia Avenue, in North Augusta, South Carolina. This initial workshop will feature brief presentations by

  8. 2010sr26.doc

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

    Thursday, September 2, 2010 james-r.giusti@srs.gov SRS Federal Employees Give to Area Food Bank Aiken, SC -- Representatives of the U.S. Department of Energy's Savannah River Operations Office (DOE-SR) at the Savannah River Site delivered the sixth and final truckload of food and non perishables to the Golden Harvest Food Bank today. The 335 federal employees at SRS donated 66,292 pounds of goods in just over 30 days to feed the needy in Georgia and South Carolina. If one does the math, the

  9. Solar radiation on variously oriented sloping surfaces

    SciTech Connect (OSTI)

    Gopinathan, K.K. )

    1991-01-01

    Monthly average daily irradiation on surfaces tilted towards the equator and also inclined at various azimuth angles are estimated for two locations in Lesotho and the results are presented. The isotropic model suggested by Liu and Jordan (Trans. of Ashrae, 526, 1962) along with the modified equation of Klein (Solar Energy, 19, 4, 1977) are employed for the estimation purposes. Surface orientations are selected at three inclinations for six different azimuth angles. Conclusions are reached for optimum tilt and orientation for summer, winter and annual collection. Total annual radiation values are computed for all the slopes and orientations.

  10. Oxygen octahedral distortions in LaMO3/SrTiO3 superlattices

    DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)

    Sanchez-Santolino, Gabriel; Cabero, Mariona; Varela, Maria; Garcia-Barriocanal, Javier; Leon, Carlos; Pennycook, Stephen J.; Santamaria, Jacobo

    2014-04-24

    Here we study the interfaces between the Mott insulator LaMnO3 (LMO) and the band insulator SrTiO3 (STO) in epitaxially grown superlattices with different thickness ratios and different transport and magnetic behaviors. Using atomic resolution electron energy-loss spectrum imaging, we analyze simultaneously the structural and chemical properties of these interfaces. We find changes in the oxygen octahedral tilts within the LaMnO3 layers when the thickness ratio between the manganite and the titanate layers is varied. Superlattices with thick LMO and ultrathin STO layers present unexpected octahedral tilts in the STO, along with a small amount of oxygen vacancies. On the othermore » hand, thick STO layers exhibit undistorted octahedra while the LMO layers present reduced O octahedral distortions near the interfaces. In conclusion, these findings will be discussed in view of the transport and magnetic differences found in previous studies.« less

  11. Solar Circuitry

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

    Solar Circuitry" with the Solar Powered Energy Kit Curriculum: Solar Power- (lightelectromagnetic radiation, electricity, circuitry, efficiency, energy transformation, subatomic ...

  12. Solar collection

    SciTech Connect (OSTI)

    Cole, S.L.

    1984-08-01

    This report contains summaries and pictures of projects funded by the Appropriate Technology Small Grants Program which include the following solar technologies: solar dish; photovoltaics; passive solar building and solar hot water system; Trombe wall; hot air panel; hybrid solar heating system; solar grain dryer; solar greenhouse; solar hot water workshops; and solar workshops.

  13. Community Shared Solar with Solarize | Department of Energy

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

    Community Shared Solar with Solarize Community Shared Solar with Solarize

  14. Automatic recovery of missing amplitudes and phases in tilt-limited...

    Office of Scientific and Technical Information (OSTI)

    Automatic recovery of missing amplitudes and phases in tilt-limited electron crystallography of two-dimensional crystals Citation Details In-Document Search Title: Automatic...

  15. Solar collector with altitude tracking

    DOE Patents [OSTI]

    Barak, Amitzur Z.

    1977-01-01

    A device is provided for turning a solar collector about an east-west horizontal axis so that the collector is tilted toward the sun as the EWV altitude of the sun varies each day. It includes one or more heat responsive elements and a shading means aligned so that within a range of EWV altitudes of the sun during daylight hours the shading means shades the element or elements while during the rest of the daylight hours the elements or elements are heated by the sun to assume heated, stable states. Mechanical linkage between the collector and the element is responsive to the states of the element or elements to tilt the collector in accordance with variations in the EWV altitude of the sun.

  16. The effects of gantry tilt on breast dose and image noise in cardiac CT

    SciTech Connect (OSTI)

    Hoppe, Michael E.; Gandhi, Diksha; Schmidt, Taly Gilat; Stevens, Grant M.; Foley, W. Dennis

    2013-12-15

    Purpose: This study investigated the effects of tilted-gantry acquisition on image noise and glandular breast dose in females during cardiac computed tomography (CT) scans. Reducing the dose to glandular breast tissue is important due to its high radiosensitivity and limited diagnostic significance in cardiac CT scans.Methods: Tilted-gantry acquisition was investigated through computer simulations and experimental measurements. Upon IRB approval, eight voxelized phantoms were constructed from previously acquired cardiac CT datasets. Monte Carlo simulations quantified the dose deposited in glandular breast tissue over a range of tilt angles. The effects of tilted-gantry acquisition on breast dose were measured on a clinical CT scanner (CT750HD, GE Healthcare) using an anthropomorphic phantom with MOSFET dosimeters in the breast regions. In both simulations and experiments, scans were performed at gantry tilt angles of 0°–30°, in 5° increments. The percent change in breast dose was calculated relative to the nontilted scan for all tilt angles. The percent change in noise standard deviation due to gantry tilt was calculated in all reconstructed simulated and experimental images.Results: Tilting the gantry reduced the breast dose in all simulated and experimental phantoms, with generally greater dose reduction at increased gantry tilts. For example, at 30° gantry tilt, the dosimeters located in the superior, middle, and inferior breast regions measured dose reductions of 74%, 61%, and 9%, respectively. The simulations estimated 0%–30% total breast dose reduction across the eight phantoms and range of tilt angles. However, tilted-gantry acquisition also increased the noise standard deviation in the simulated phantoms by 2%–50% due to increased pathlength through the iodine-filled heart. The experimental phantom, which did not contain iodine in the blood, demonstrated decreased breast dose and decreased noise at all gantry tilt angles.Conclusions: Tilting the

  17. Apparatus for raising or tilting a micromechanical structure

    DOE Patents [OSTI]

    Allen, James J.

    2008-09-09

    An active hinge apparatus is disclosed which can be used to raise a micromechanical structure (e.g. a plate or micromirror) on a substrate. The active hinge apparatus utilizes one or more of teeth protruding outward from an axle which also supports the micromechanical structure on one end thereof. A rack is used to engage the teeth and rotate the axle to raise the micromechanical structure and tilt the structure at an angle to the substrate. Motion of the rack is provided by an actuator which can be a mechanically-powered actuator, or alternately an electrostatic comb actuator or a thermal actuator. A latch can be optionally provided in the active hinge apparatus to lock the micromechanical structure in an "erected" position.

  18. Microelectromechanical apparatus for elevating and tilting a platform

    DOE Patents [OSTI]

    Miller, Samuel Lee; McWhorter, Paul Jackson; Rodgers, Murray Steven; Sniegowski, Jeffry J.; Barnes, Stephen M.

    2003-04-08

    A microelectromechanical (MEM) apparatus is disclosed which has a platform that can be elevated above a substrate and tilted at an arbitrary angle using a plurality of flexible members which support the platform and control its movement. Each flexible member is further controlled by one or more MEM actuators which act to bend the flexible member. The MEM actuators can be electrostatic comb actuators or vertical zip actuators, or a combination thereof. The MEM apparatus can include a mirror coating to form a programmable mirror for redirecting or switching one or more light beams for use in a projection display. The MEM apparatus with the mirror coating also has applications for switching light beams between optical fibers for use in a local area fiber optic network, or for use in fiber optic telecommunications or data communications systems.

  19. Microelectromechanical apparatus for elevating and tilting a platform

    DOE Patents [OSTI]

    Miller, Samuel Lee; McWhorter, Paul Jackson; Rodgers, Murray Steven; Sniegowski, Jeffry J.; Barnes, Stephen M.

    2004-07-06

    A microelectromechanical (MEM) apparatus is disclosed which has a platform that can be elevated above a substrate and tilted at an arbitrary angle using a plurality of flexible members which support the platform and control its movement. Each flexible member is further controlled by one or more MEM actuators which act to bend the flexible member. The MEM actuators can be electrostatic comb actuators or vertical zip actuators, or a combination thereof. The MEM apparatus can include a mirror coating to form a programmable mirror for redirecting or switching one or more light beams for use in a projection display. The MEM apparatus with-the mirror coating also has applications for switching light beams between optical fibers for use in a local area fiber optic network, or for use in fiber optic telecommunications or data communications systems.

  20. Solar Newsletter

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

    Sandia Labs Contributes to Solar Industry Innovation: A Partnership Story Customers & Partners, News, Partnership, Photovoltaic, Renewable Energy, Solar, Solar Newsletter Sandia ...

  1. Feasibility Study of Solar Photovoltaics on Landfills in Puerto Rico (Second Study)

    SciTech Connect (OSTI)

    Salasovich, J.; Mosey, G.

    2011-08-01

    This report presents the results of an assessment of the technical and economic feasibility of deploying a solar photovoltaics (PV) system on landfill sites in Puerto Rico. The purpose of this report is to assess the landfills with the highest potential for possible solar PV installation and estimate cost, performance, and site impacts of three different PV options: crystalline silicon (fixed tilt), crystalline silicon (single-axis tracking), and thin film (fixed tilt). The report outlines financing options that could assist in the implementation of a system. According to the site production calculations, the most cost-effective system in terms of return on investment is the thin-film fixed-tilt technology. The report recommends financing options that could assist in the implementation of such a system. The landfills and sites considered in this report were all determined feasible areas in which to implement solar PV systems.

  2. Method for removing tilt control in adaptive optics systems

    DOE Patents [OSTI]

    Salmon, Joseph Thaddeus

    1998-01-01

    A new adaptive optics system and method of operation, whereby the method removes tilt control, and includes the steps of using a steering mirror to steer a wavefront in the desired direction, for aiming an impinging aberrated light beam in the direction of a deformable mirror. The deformable mirror has its surface deformed selectively by means of a plurality of actuators, and compensates, at least partially, for existing aberrations in the light beam. The light beam is split into an output beam and a sample beam, and the sample beam is sampled using a wavefront sensor. The sampled signals are converted into corresponding electrical signals for driving a controller, which, in turn, drives the deformable mirror in a feedback loop in response to the sampled signals, for compensating for aberrations in the wavefront. To this purpose, a displacement error (gradient) of the wavefront is measured, and adjusted by a modified gain matrix, which satisfies the following equation: G'=(I-X(X.sup.T X).sup.-1 X.sup.T)G(I-A)

  3. Method for removing tilt control in adaptive optics systems

    DOE Patents [OSTI]

    Salmon, J.T.

    1998-04-28

    A new adaptive optics system and method of operation are disclosed, whereby the method removes tilt control, and includes the steps of using a steering mirror to steer a wavefront in the desired direction, for aiming an impinging aberrated light beam in the direction of a deformable mirror. The deformable mirror has its surface deformed selectively by means of a plurality of actuators, and compensates, at least partially, for existing aberrations in the light beam. The light beam is split into an output beam and a sample beam, and the sample beam is sampled using a wavefront sensor. The sampled signals are converted into corresponding electrical signals for driving a controller, which, in turn, drives the deformable mirror in a feedback loop in response to the sampled signals, for compensating for aberrations in the wavefront. To this purpose, a displacement error (gradient) of the wavefront is measured, and adjusted by a modified gain matrix, which satisfies the following equation: G{prime} = (I{minus}X(X{sup T} X){sup {minus}1}X{sup T})G(I{minus}A). 3 figs.

  4. Precision tip-tilt-piston actuator that provides exact constraint

    DOE Patents [OSTI]

    Hale, Layton C.

    1999-01-01

    A precision device which can precisely actuate three degrees of freedom of an optic mount, commonly referred to as tip, tilt, and piston. The device consists of three identical flexure mechanisms, an optic mount to be supported and positioned, a structure that supports the flexure mechanisms, and three commercially available linear actuators. The advantages of the precision device is in the arrangement of the constraints offered by the flexure mechanism and not in the particular design of the flexure mechanisms, as other types of mechanisms could be substituted. Each flexure mechanism constrains two degrees of freedom in the plane of the mechanisms and one direction is actuated. All other degrees of freedom are free to move within the range of flexure mechanisms. Typically, three flexure mechanisms are equally spaced in angle about to optic mount and arranged so that each actuated degree of freedom is perpendicular to the plane formed by the optic mount. This arrangement exactly constrains the optic mount and allows arbitrary actuated movement of the plane within the range of the flexure mechanisms. Each flexure mechanism provides a mechanical advantage, typically on the order of 5:1, between the commercially available actuator and the functional point on the optic mount. This improves resolution by the same ratio and stiffness by the square of the ratio.

  5. PROBING THE UNIVERSE'S TILT WITH THE COSMIC INFRARED BACKGROUND DIPOLE

    SciTech Connect (OSTI)

    Fixsen, D. J.; Kashlinsky, A. E-mail: alexander.kashlinsky@nasa.gov

    2011-06-10

    Conventional interpretation of the observed cosmic microwave background (CMB) dipole is that all of it is produced by local peculiar motions. Alternative explanations requiring part of the dipole to be primordial have received support from measurements of large-scale bulk flows. A test of the two hypotheses is whether other cosmic dipoles produced by collapsed structures later than the last scattering coincide with the CMB dipole. One background is the cosmic infrared background (CIB) whose absolute spectrum was measured to {approx}30% by the COBE satellite. Over the 100-500 {mu}m wavelength range its spectral energy distribution can provide a probe of its alignment with the CMB. This is tested with the COBE FIRAS data set which is available for such a measurement because of its low noise and frequency resolution which are important for Galaxy subtraction. Although the FIRAS instrument noise is in principle low enough to determine the CIB dipole, the Galactic foreground is sufficiently close spectrally to keep the CIB dipole hidden. A similar analysis is performed with DIRBE, which-because of the limited frequency coverage-provides a poorer data set. We discuss strategies for measuring the CIB dipole with future instruments to probe the tilt and apply it to the Planck, Herschel, and the proposed Pixie missions. We demonstrate that a future FIRAS-like instrument with instrument noise a factor of {approx}10 lower than FIRAS would make a statistically significant measurement of the CIB dipole. We find that the Planck and Herschel data sets will not allow a robust CIB dipole measurement. The Pixie instrument promises a determination of the CIB dipole and its alignment with either the CMB dipole or the dipole galaxy acceleration vector.

  6. Increasing the solar photovoltaic energy capture on sunny and cloudy days

    SciTech Connect (OSTI)

    Kelly, Nelson A.; Gibson, Thomas L.

    2011-01-15

    This report analyzes an extensive set of measurements of the solar irradiance made using four identical solar arrays and associated solar sensors (collectively referred to as solar collectors) with different tilt angles relative to the earth's surface, and thus the position of the sun, in order to determine an optimal tracking algorithm for capturing solar radiation. The study included a variety of ambient conditions including different seasons and both cloudy and cloud-free conditions. One set of solar collectors was always approximately pointed directly toward the sun (DTS) for a period around solar noon. These solar collectors thus captured the direct beam component of the solar radiation that predominates on sunny days. We found that on sunny days, solar collectors with a DTS configuration captured more solar energy in accordance with the well-known cosine dependence for the response of a flat-surfaced solar collector to the angle of incidence with direct beam radiation. In particular, a DTS orientation was found to capture up to twice as much solar energy as a horizontal (H) orientation in which the array is tilted toward the zenith. Another set of solar collectors always had an H orientation, and this best captured the diffuse component of the solar radiation that predominates on cloudy days. The dependence of the H/DTS ratio on the solar-collector tilt angle was in approximate agreement with the Isotropic Diffuse Model derived for heavily overcast conditions. During cloudy periods, we found that an H configuration increased the solar energy capture by nearly 40% compared to a DTS configuration during the same period, and we estimate the solar energy increase of an H configuration over a system that tracks the obscured solar disk could reach 50% over a whole heavily-overcast day. On an annual basis the increase is predicted to be much less, typically only about 1%, because the contribution of cloudy days to the total annual solar energy captured by a

  7. Quantum oscillations and subband properties of the two-dimensional electron gas at the LaAlO{sub 3}/SrTiO{sub 3} interface

    SciTech Connect (OSTI)

    McCollam, A. Guduru, V. K.; Zeitler, U.; Maan, J. C.; Wenderich, S.; Kruize, M. K.; Molegraaf, H. J. A.; Huijben, M.; Koster, G.; Blank, D. H. A.; Rijnders, G.; Brinkman, A.; Hilgenkamp, H.

    2014-02-01

    We have performed high field magnetotransport measurements to investigate the interface electron gas in a high mobility SrTiO{sub 3}/SrCuO{sub 2}/LaAlO{sub 3}/SrTiO{sub 3} heterostructure. Shubnikov-de Haas oscillations reveal several 2D conduction subbands with carrier effective masses of 0.9m{sub e} and 2m{sub e}, quantum mobilities of order 2000 cm{sup 2}/V s, and band edges only a few millielectronvolts below the Fermi energy. Measurements in tilted magnetic fields confirm the 2D character of the electron gas, and show evidence of inter-subband scattering.

  8. Improved photovoltaic energy output for cloudy conditions with a solar tracking system

    SciTech Connect (OSTI)

    Kelly, Nelson A.; Gibson, Thomas L.

    2009-11-15

    This work describes measurements of the solar irradiance made during cloudy periods in order to improve the amount of solar energy captured during such periods. It is well-known that 2-axis tracking, in which solar modules are pointed at the sun, improves the overall capture of solar energy by a given area of modules by 30-50% versus modules with a fixed tilt. On sunny days the direct sunshine accounts for up to 90% of the total solar energy, with the other 10% from diffuse (scattered) solar energy. However, during overcast conditions nearly all of the solar irradiance is diffuse radiation that is isotropically-distributed over the whole sky. An analysis of our data shows that during overcast conditions, tilting a solar module or sensor away from the zenith reduces the irradiance relative to a horizontal configuration, in which the sensor or module is pointed toward the zenith (horizontal module tilt), and thus receives the highest amount of this isotropically-distributed sky radiation. This observation led to an improved tracking algorithm in which a solar array would track the sun during cloud-free periods using 2-axis tracking, when the solar disk is visible, but go to a horizontal configuration when the sky becomes overcast. During cloudy periods we show that a horizontal module orientation increases the solar energy capture by nearly 50% compared to 2-axis solar tracking during the same period. Improving the harvesting of solar energy on cloudy days is important to using solar energy on a daily basis for fueling fuel-cell electric vehicles or charging extended-range electric vehicles because it improves the energy capture on the days with the lowest hydrogen generation, which in turn reduces the system size and cost. (author)

  9. Solar Easements

    Broader source: Energy.gov [DOE]

    New Hampshire's "solar skyspace easement" provisions allow property owners to create solar easements in order to create and preserve a right to unobstructed access to solar energy. Easements remain...

  10. Solar Newsletter

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

    Stationary Power/Energy Conversion Efficiency/Solar Energy/Solar Newsletter Solar Newsletter Tara Camacho-Lopez 2016-07-11T20:14:36+00:00

  11. SR-08-02.doc

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

    Media Contacts: For Immediate Release Embargoed until August 1, 2008 DOE: Julie Petersen, (803) 952-7697 julie.petersen@srs.gov SRNS: Will Callicott, (803) 952-9583 will.callicott@srs.gov DOE Authorizes New Contractor to Begin Management and Operations of the Savannah River Site Aiken, SC - Yesterday (July 31), the U.S. Department of Energy Savannah River Operations Office (DOE-SR) Manager, Jeffrey M. Allison, and the Savannah River Nuclear Solutions (SRNS) President and Chief Executive

  12. The J. Bennett Johnston Sr.

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

    Johnston Sr. Center for Advanced Microstructures and Devices (CAMD) EXCELLENCE IN SCIENCE AND ENGINEERING RESEARCH 2 Overview LSU's Center for Advanced Microstructures and Devices (CAMD) provides researchers access to the only synchrotron light source in the southeastern United States. One of seven such facilities in the nation, more than 150 researchers, including LSU faculty, industrial users, local startup companies, and members of national research labs, use CAMD. It is also a key resource

  13. First Solar Manufacturing Solar Modules

    Broader source: Energy.gov [DOE]

    In this photograph, a First Solar associate handles photovoltaic materials at the company's Ohio manufacturing plant. First Solar is an industry partner with the U.S. Department of Energy Solar...

  14. Region Solar Inc Solar Inc California Renewable Energy Solar...

    Open Energy Info (EERE)

    Point Drive Fort Collins Colorado Solar Solar cell passive solar architectural glass solar grid tie inverter semiconductor flat panel display data storage http www advanced...

  15. NREL: Solar Research - Solar Newsletter

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

    Solar Newsletter Subscribe: To receive new issues by email, subscribe to the newsletter. The Solar Newsletter is a monthly electronic newsletter that provides information on NREL's ...

  16. Blue-tilted tensor spectrum and thermal history of the Universe

    SciTech Connect (OSTI)

    Kuroyanagi, Sachiko; Takahashi, Tomo; Yokoyama, Shuichiro E-mail: tomot@cc.saga-u.ac.jp

    2015-02-01

    We investigate constraints on the spectral index of primordial gravitational waves (GWs), paying particular attention to a blue-tilted spectrum. Such constraints can be used to test a certain class of models of the early Universe. We investigate observational bounds from LIGO+Virgo, pulsar timing and big bang nucleosynthesis, taking into account the suppression of the amplitude at high frequencies due to reheating after inflation and also late-time entropy production. Constraints on the spectral index are presented by changing values of parameters such as reheating temperatures and the amount of entropy produced at late time. We also consider constraints under the general modeling approach which can approximately describe various scenarios of the early Universe. We show that the constraints on the blue spectral tilt strongly depend on the underlying assumption and, in some cases, a highly blue-tilted spectrum can still be allowed.

  17. Design and initial characterization of a compact, ultra high vacuum compatible, low frequency, tilt accelerometer

    SciTech Connect (OSTI)

    OToole, A. E-mail: riccardo.desalvo@gmail.com; Pea Arellano, F. E.; Rodionov, A. V.; Kim, C.; Shaner, M.; Asadoor, M.; Sobacchi, E.; Dergachev, V.; DeSalvo, R. E-mail: riccardo.desalvo@gmail.com; Bhawal, A.; Gong, P.; Lottarini, A.; Minenkov, Y.; Murphy, C.

    2014-07-15

    A compact tilt accelerometer with high sensitivity at low frequency was designed to provide low frequency corrections for the feedback signal of the Advanced Laser Interferometer Gravitational Wave Observatory active seismic attenuation system. It has been developed using a Tungsten Carbide ceramic knife-edge hinge designed to avoid the mechanical 1/f noise believed to be intrinsic in polycrystalline metallic flexures. Design and construction details are presented; prototype data acquisition and control limitations are discussed. The instrument's characterization reported here shows that the hinge is compatible with being metal-hysteresis-free, and therefore also free of the 1/f noise generated by the dislocation Self-Organized Criticality in the metal. A tiltmeter of this kind will be effective to separate the ground tilt component from the signal of horizontal low frequency seismometers, and to correct the ill effects of microseismic tilt in advanced seismic attenuation systems.

  18. SR????

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

    28, 2006 Media Contact: James Giusti (803) 952-7697 Note To Editors and News Directors: Aiken, SC – On Thursday, November 30, U.S. Department of Energy Assistant Secretary for Environmental Management James Rispoli will speak at a ceremony marking the completion of T Area Closure at the Savannah River Site. T Area was the first operational area at SRS, starting up in 1952 and continuing to serve the site until 2002, when demolition began on its 28 facilities. Demolition was completed in 2004,

  19. SR????

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

    February 13, 2007 Media Contact: James Giusti (803) 952-7697 james-r.giusti@srs.gov DOE Seeks Public Input on Scope of Environmental Review for the Global Nuclear Energy Partnership Aiken, South Carolina – The U.S. Department of Energy’s Savannah River Operations Office today announced that the second public scoping meeting to begin the Programmatic Environmental Impact Statement (PEIS) for the President’s Global Nuclear Energy Partnership (GNEP) will be held on Thursday, February 15, 2007 at

  20. Suppression of n=1 Tilt Instability by Magnetic Shaping Coils in Rotamak Plasmas

    SciTech Connect (OSTI)

    Yang, X.; Petrov, Y.; Huang, T. S.

    2009-06-26

    Measurements from the array of Mirnov magnetic coils provide the first evidence for n=1 tilt and radial shift instabilities in a 40 ms field-reversed configuration (FRC) driven by rotating magnetic field. External plasma-shaping magnetic coils are utilized to suppress the n=1 instability modes. It is demonstrated that by energizing the middle shaping coil with 250-500 A current, the tilt mode is completely suppressed when a doublet FRC with an internal figure-of-eight separatrix is formed.

  1. Nevada Solar One Solar Power Plant | Open Energy Information

    Open Energy Info (EERE)

    Solar One Solar Power Plant Jump to: navigation, search Name Nevada Solar One Solar Power Plant Facility Nevada Solar One Sector Solar Facility Type Concentrating Solar Power...

  2. Mojave Solar Park Solar Power Plant | Open Energy Information

    Open Energy Info (EERE)

    Solar Park Solar Power Plant Jump to: navigation, search Name Mojave Solar Park Solar Power Plant Facility Mojave Solar Park Sector Solar Facility Type Concentrating Solar Power...

  3. Starwood Solar I Solar Power Plant | Open Energy Information

    Open Energy Info (EERE)

    Starwood Solar I Solar Power Plant Jump to: navigation, search Name Starwood Solar I Solar Power Plant Facility Starwood Solar I Sector Solar Facility Type Concentrating Solar...

  4. Solar Power

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

    Solar Power Solar Power Project Opportunities Abound in the Region The WIPP site is receives abundant solar energy with 6-7 kWh/sq meter power production potential As the accompanying map of New Mexico shows, the WIPP site enjoys abundant year-round sunshine. With an average solar power production potential of 6-7 kWh/sq meter per day, one exciting project being studied for location at WIPP is a 30-50 MW Solar Power Tower: The American Solar Energy Society (ASES) is is a national trade

  5. Brookhaven National Laboratory - Sr-90 BGGR/WCF | Department...

    Office of Environmental Management (EM)

    Sr-90 BGGRWCF Brookhaven National Laboratory - Sr-90 BGGRWCF January 1, 2014 - 12:00pm ... InstallationName, State: Brookhaven National Laboratory Responsible DOE Office: Office of ...

  6. ImagineSolar | Open Energy Information

    Open Energy Info (EERE)

    Workforce training, Corporate consulting - Solar projects, Solar sales, Solar marketing, Solar business development, Solar policy, Solar advocacy, Solar government...

  7. Solar Manufacturing Projects | Department of Energy

    Office of Environmental Management (EM)

    Solar Manufacturing Projects Solar Manufacturing Projects Solar Manufacturing Projects Solar Manufacturing Projects Solar Manufacturing Projects Solar Manufacturing Projects SOLAR ...

  8. Weakest solar wind of the space age and the current 'MINI' solar maximum

    SciTech Connect (OSTI)

    McComas, D. J.; Angold, N.; Elliott, H. A.; Livadiotis, G.; Schwadron, N. A.; Smith, C. W.; Skoug, R. M.

    2013-12-10

    The last solar minimum, which extended into 2009, was especially deep and prolonged. Since then, sunspot activity has gone through a very small peak while the heliospheric current sheet achieved large tilt angles similar to prior solar maxima. The solar wind fluid properties and interplanetary magnetic field (IMF) have declined through the prolonged solar minimum and continued to be low through the current mini solar maximum. Compared to values typically observed from the mid-1970s through the mid-1990s, the following proton parameters are lower on average from 2009 through day 79 of 2013: solar wind speed and beta (?11%), temperature (?40%), thermal pressure (?55%), mass flux (?34%), momentum flux or dynamic pressure (?41%), energy flux (?48%), IMF magnitude (?31%), and radial component of the IMF (?38%). These results have important implications for the solar wind's interaction with planetary magnetospheres and the heliosphere's interaction with the local interstellar medium, with the proton dynamic pressure remaining near the lowest values observed in the space age: ?1.4 nPa, compared to ?2.4 nPa typically observed from the mid-1970s through the mid-1990s. The combination of lower magnetic flux emergence from the Sun (carried out in the solar wind as the IMF) and associated low power in the solar wind points to the causal relationship between them. Our results indicate that the low solar wind output is driven by an internal trend in the Sun that is longer than the ?11 yr solar cycle, and they suggest that this current weak solar maximum is driven by the same trend.

  9. Influences of photosynthetically active radiation on cladode orientation, stem tilting, and height of cacti

    SciTech Connect (OSTI)

    Nobel, P.S.

    1981-08-01

    Stem orientation and morphology were investigated for 14 species of cacti in Chile, Ecuador, Mexico, and the United States. The interception of photosynthetically active radiation (PAR) was specifically considered for cladodes (flattened stems) of platyopuntias, for tilted cylindrical stems, and in the presence of surrounding vegetation.

  10. First results of a polychromatic artificial sodium star for the correction of tilt

    SciTech Connect (OSTI)

    Friedman, H.; Foy, R..; Tallon, M.; Migus, A.

    1996-03-06

    This paper presents the first results of a joint experiment carried out at Lawrence Livermore National Laboratory during January, 1996. Laser and optical systems were tested to provide a polychromatic artificial sodium star for the correction of tilt. This paper presents the results of that experiment.

  11. Exploring a possible origin of a 14 deg y-normal spin tilt at RHIC polarimeter

    SciTech Connect (OSTI)

    Meot, F.; Huang, H.

    2015-06-15

    A possible origin of a 14 deg y-normal spin n0 tilt at the polarimeter is in snake angle defects. This possible cause is investigated by scanning the snake axis angle µ, and the spin rotation angle at the snake, φ, in the vicinity of their nominal values.

  12. Solar Rights

    Broader source: Energy.gov [DOE]

    In the context of this law, a solar energy device is a system "manufactured and sold for the sole purpose of facilitating the collection and beneficial use of solar energy, including passive...

  13. Solar Rights

    Broader source: Energy.gov [DOE]

    A solar energy system is defined as "a system affixed to a building or buildings that uses solar devices, which are thermally isolated from living space or any other area where the energy is used...

  14. Solar Blog

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

    96426 Solar Blog en Solar Energy Jobs Outpace U.S. Economy http:energy.govarticlessolar-energy-jobs-outpace-us-economy

  15. Solar Rights

    Broader source: Energy.gov [DOE]

    Cities and counties in North Carolina generally may not adopt ordinances prohibiting the installation of "a solar collector that gathers solar radiation as a substitute for traditional energy for...

  16. Solar Forecasting

    Broader source: Energy.gov [DOE]

    On December 7, 2012, DOE announced $8 million to fund two solar projects that are helping utilities and grid operators better forecast when, where, and how much solar power will be produced at U.S....

  17. Solar collectors

    SciTech Connect (OSTI)

    Cassidy, V.M.

    1981-11-01

    Practical applications of solar energy in commercial, industrial and institutional buildings are considered. Two main types of solar collectors are described: flat plate collectors and concentrating collectors. Efficiency of air and hydronic collectors among the flat plate types are compared. Also several concentrators are described, including their sun tracking mechanisms. Descriptions of some recent solar installations are presented and a list representing the cross section of solar collector manufacturers is furnished.

  18. Selection of a numerical unsaturated flow code for tilted capillary barrier performance evaluation

    SciTech Connect (OSTI)

    Webb, S.W. [Sandia National Labs., Albuquerque, NM (United States). Geohydrology Dept.

    1996-09-01

    Capillary barriers consisting of tilted fine-over-coarse layers have been suggested as landfill covers as a means to divert water infiltration away from sensitive underground regions under unsaturated flow conditions, especially for arid and semi-arid regions. Typically, the HELP code is used to evaluate landfill cover performance and design. Unfortunately, due to its simplified treatment of unsaturated flow and its essentially one-dimensional nature, HELP is not adequate to treat the complex multidimensional unsaturated flow processes occurring in a tilted capillary barrier. In order to develop the necessary mechanistic code for the performance evaluation of tilted capillary barriers, an efficient and comprehensive unsaturated flow code needs to be selected for further use and modification. The present study evaluates a number of candidate mechanistic unsaturated flow codes for application to tilted capillary barriers. Factors considered included unsaturated flow modeling, inclusion of evapotranspiration, nodalization flexibility, ease of modification, and numerical efficiency. A number of unsaturated flow codes are available for use with different features and assumptions. The codes chosen for this evaluation are TOUGH2, FEHM, and SWMS{_}2D. All three codes chosen for this evaluation successfully simulated the capillary barrier problem chosen for the code comparison, although FEHM used a reduced grid. The numerical results are a strong function of the numerical weighting scheme. For the same weighting scheme, similar results were obtained from the various codes. Based on the CPU time of the various codes and the code capabilities, the TOUGH2 code has been selected as the appropriate code for tilted capillary barrier performance evaluation, possibly in conjunction with the infiltration, runoff, and evapotranspiration models of HELP. 44 refs.

  19. Purchasing Solar Collectively with Solarize

    Broader source: Energy.gov [DOE]

    This video provides an overview of the concept behind The Solarize Guidebook, which offers neighborhoods a plan for getting volume discounts when making group purchases of rooftop solar energy...

  20. ARM: Baseline Solar Radiation Network (BSRN): solar irradiances...

    Office of Scientific and Technical Information (OSTI)

    Baseline Solar Radiation Network (BSRN): solar irradiances Title: ARM: Baseline Solar Radiation Network (BSRN): solar irradiances Baseline Solar Radiation Network (BSRN): solar ...

  1. Deming Solar Plant Solar Power Plant | Open Energy Information

    Open Energy Info (EERE)

    Deming Solar Plant Solar Power Plant Jump to: navigation, search Name Deming Solar Plant Solar Power Plant Facility Deming Solar Plant Sector Solar Facility Type Photovoltaic...

  2. SES Calico Solar One Project Solar Power Plant | Open Energy...

    Open Energy Info (EERE)

    Calico Solar One Project Solar Power Plant Jump to: navigation, search Name SES Calico Solar One Project Solar Power Plant Facility SES Calico Solar One Project Sector Solar...

  3. Nvision.Solar - Ravnishte Solar PV Plant | Open Energy Information

    Open Energy Info (EERE)

    Solar - Ravnishte Solar PV Plant Jump to: navigation, search Name Nvision.Solar - Ravnishte Solar PV Plant Facility Ravishte roof and facade mounted solar power plant Sector Solar...

  4. Solar Millenium Palen Solar Power Plant | Open Energy Information

    Open Energy Info (EERE)

    Palen Solar Power Plant Jump to: navigation, search Name Solar Millenium Palen Solar Power Plant Facility Solar Millenium Palen Sector Solar Facility Type Concentrating Solar Power...

  5. SES Solar Two Project Solar Power Plant | Open Energy Information

    Open Energy Info (EERE)

    Two Project Solar Power Plant Jump to: navigation, search Name SES Solar Two Project Solar Power Plant Facility SES Solar Two Project Sector Solar Facility Type Concentrating Solar...

  6. Carrizo Energy Solar Farm Solar Power Plant | Open Energy Information

    Open Energy Info (EERE)

    Carrizo Energy Solar Farm Solar Power Plant Jump to: navigation, search Name Carrizo Energy Solar Farm Solar Power Plant Facility Carrizo Energy Solar Farm Sector Solar Facility...

  7. Beacon Solar Energy Project Solar Power Plant | Open Energy Informatio...

    Open Energy Info (EERE)

    Solar Energy Project Solar Power Plant Jump to: navigation, search Name Beacon Solar Energy Project Solar Power Plant Facility Beacon Solar Energy Project Sector Solar Facility...

  8. Prescott Airport Solar Plant Solar Power Plant | Open Energy...

    Open Energy Info (EERE)

    Prescott Airport Solar Plant Solar Power Plant Jump to: navigation, search Name Prescott Airport Solar Plant Solar Power Plant Facility Prescott Airport Solar Plant Sector Solar...

  9. El Dorado Solar Project Solar Power Plant | Open Energy Information

    Open Energy Info (EERE)

    Solar Project Solar Power Plant Jump to: navigation, search Name El Dorado Solar Project Solar Power Plant Facility El Dorado Solar Project Sector Solar Facility Type Photovoltaic...

  10. Rapid method to determine 89Sr/90Sr in large concrete samples

    DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)

    Maxwell, Sherrod L.; Culligan, Brian; Hutchison, Jay B.; Utsey, Robin C.; Sudowe, Ralf; McAlister, Daniel R.

    2016-03-24

    Here, a new rapid method has been developed that provides high quality low-level measurements of 89,90Sr in concrete samples with an MDA (Minimum Detectable Activity) of <1 mBq g-1. The new method is fast, meets new decommissioning regulatory limits and is robust even if refractory particles are present. The method utilizes a rapid fusion to ensure total dissolution of samples and rapid preconcentration and separation of 89,90Sr from 5-10 g concrete samples. When, the 89Sr/90Sr ratio is high, Sr can be isolated from up to 5g concrete samples, total 89/90Sr measured, and then 90Sr determined via 90Y separated after amore » period of ingrowth. Another approach allows the immediate determination of 90Sr in 10 g concrete aliquots without waiting for 90Y ingrowth, in instances where the shorter lived 89Sr is unlikely to be encountered.« less

  11. Solar | Department of Energy

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

    Science & Innovation Energy Sources Renewable Energy Solar Solar How much do you know about solar power? Take our quiz and test your solar energy IQ. | Photo courtesy of ...

  12. NREL: Concentrating Solar Power Research - Concentrating Solar...

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

    Concentrating Solar Power Resource Maps These direct-normal solar radiation maps-filtered by solar resource and land availability-identify the most economically suitable lands ...

  13. Microsoft Word - Tilted-Rig-TP-Definition-Version1-Aug-14-2012A.doc

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

    Test Problem: Tilted Rayleigh-Taylor for 2-D Mixing Studies Authors: Malcolm J. Andrews (XCP-4, LANL), 505-606-1430, mandrews@lanl.gov David L. Youngs (AWE) , david.youngs@awe.co.uk Daniel Livescu (CCS-2, LANL), 505-665-1758, livescu@lanl.gov Date: August 10, 2012 Version: 1.0 LA-UR: 12-24091 Contents 1. Introduction................................................................................................................................. 2 2. Problem definition

  14. Scattering Solar Thermal Concentrators

    SciTech Connect (OSTI)

    Giebink, Noel C.

    2015-01-31

    This program set out to explore a scattering-based approach to concentrate sunlight with the aim of improving collector field reliability and of eliminating wind loading and gross mechanical movement through the use of a stationary collection optic. The approach is based on scattering sunlight from the focal point of a fixed collection optic into the confined modes of a sliding planar waveguide, where it is transported to stationary tubular heat transfer elements located at the edges. Optical design for the first stage of solar concentration, which entails focusing sunlight within a plane over a wide range of incidence angles (>120 degree full field of view) at fixed tilt, led to the development of a new, folded-path collection optic that dramatically out-performs the current state-of-the-art in scattering concentration. Rigorous optical simulation and experimental testing of this collection optic have validated its performance. In the course of this work, we also identified an opportunity for concentrating photovoltaics involving the use of high efficiency microcells made in collaboration with partners at the University of Illinois. This opportunity exploited the same collection optic design as used for the scattering solar thermal concentrator and was therefore pursued in parallel. This system was experimentally demonstrated to achieve >200x optical concentration with >70% optical efficiency over a full day by tracking with <1 cm of lateral movement at fixed latitude tilt. The entire scattering concentrator waveguide optical system has been simulated, tested, and assembled at small scale to verify ray tracing models. These models were subsequently used to predict the full system optical performance at larger, deployment scale ranging up to >1 meter aperture width. Simulations at an aperture widths less than approximately 0.5 m with geometric gains ~100x predict an overall optical efficiency in the range 60-70% for angles up to 50 degrees from normal. However, the

  15. Cosmological signatures of tilted isocurvature perturbations: reionization and 21cm fluctuations

    SciTech Connect (OSTI)

    Sekiguchi, Toyokazu; Sugiyama, Naoshi; Tashiro, Hiroyuki; Silk, Joseph E-mail: hiroyuki.tashiro@asu.edu E-mail: naoshi@nagoya-u.jp

    2014-03-01

    We investigate cosmological signatures of uncorrelated isocurvature perturbations whose power spectrum is blue-tilted with spectral index 2?tilted isocurvature primordial power spectrum. We also study the consequences for 21cm line fluctuations due to neutral hydrogens in minihalos. Combination of measurements of the reionization optical depth and 21cm line fluctuations will provide complementary probes of a highly blue-tilted isocurvature power spectrum.

  16. Solar Newsletter

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

    Energy & Climate Secure & Sustainable Energy Future Stationary Power Energy Conversion Efficiency Solar Energy Wind Energy Water Power Supercritical CO2 Geothermal Natural Gas ...

  17. Solar Mapper

    Broader source: Energy.gov [DOE]

    Interactive, online mapping tool providing access to spatial data related to siting utility-scale solar facilities in the southwestern United States.

  18. Solar Newsletter

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

    Sandia Home Locations Contact Us Employee Locator Energy & Climate Secure & Sustainable Energy Future Stationary Power Energy Conversion Efficiency Solar Energy Wind Energy Water ...

  19. Solar Newsletter

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

    Secure & Sustainable Energy Future Stationary Power Energy Conversion Efficiency Solar Energy Wind Energy Water Power Supercritical CO2 Geothermal Natural Gas Safety, Security & ...

  20. Solar Decathlon

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

    ... Administration and DOE EERE International Program: Solar Decathlon China 2013 16 | Building Technologies Office eere.energy.gov Project Integration, Collaboration & Market Impact ...

  1. Solar Rights

    Broader source: Energy.gov [DOE]

    Ordinances, bylaws, or regulations may reasonably restrict the installation and use of solar energy devices to protect public health and safety, buildings from damage, historic/aesthetic values (...

  2. Solar Array Tracking Control

    Energy Science and Technology Software Center (OSTI)

    1995-06-22

    SolarTrak used in conjunction with various versions of 68HC11-based SolarTrack hardware boards provides control system for one or two axis solar tracking arrays. Sun position is computed from stored position data and time from an on-board clock/calendar chip. Position feedback can be by one or two offset motor turn counter square wave signals per axis, or by a position potentiometer. A limit of 256 counts resolution is imposed by the on-board analog to digital (A/D)more » convertor. Control is provided for one or two motors. Numerous options are provided to customize the controller for specific applications. Some options are imposed at compile time, some are setable during operation. Software and hardware board designs are provided for Control Board and separate User Interface Board that accesses and displays variables from Control Board. Controller can be used with range of sensor options ranging from a single turn count sensor per motor to systems using dual turn-count sensors, limit sensors, and a zero reference sensor. Dual axis trackers oriented azimuth elevation, east west, north south, or polar declination can be controlled. Misalignments from these orientations can also be accommodated. The software performs a coordinate transformation using six parameters to compute sun position in misaligned coordinates of the tracker. Parameters account for tilt of tracker in two directions, rotation about each axis, and gear ration errors in each axis. The software can even measure and compute these prameters during an initial setup period if current from a sun position sensor or output from photovoltaic array is available as an anlog voltage to the control board''s A/D port. Wind or emergency stow to aj present position is available triggered by digital or analog signals. Night stow is also available. Tracking dead band is adjustable from narrow to wide. Numerous features of the hardware and software conserve energy for use with battery powered systems.« less

  3. Phase transition in the Ruddlesden-Popper layered perovskite Li{sub 2}SrTa{sub 2}O{sub 7}

    SciTech Connect (OSTI)

    Pagnier, T.; Rosman, N.; Galven, C.; Suard, E.; Fourquet, J.L.; Le Berre, F.; Crosnier-Lopez, M.P.

    2009-02-15

    The crystal structure of the Ruddlesden-Popper layered perovskite Li{sub 2}SrTa{sub 2}O{sub 7} has been characterized at various temperatures between -185 and 300 deg. C by several techniques: X-ray and neutron powder diffraction, single crystal diffraction, transmission electron microscopy and Raman spectroscopy. The low temperature structure has been confirmed to be orthorhombic Cmcm with a small octahedra antiphase tilting ({phi}{phi}0) ({phi}{phi}0) inside the perovskite blocks. With temperature, the tilting progressively vanishes leading around 230 deg. C to a tetragonal symmetry (S.G. I4/mmm). This reversible phase transition, followed by X-ray and neutron thermodiffraction and thermal Raman measurements, is considered as of second order. An attribution of the Raman bands based on normal mode analysis is proposed. - Graphical abstract: Thermal evolution of Li{sub 2}SrTa{sub 2}O{sub 7} X-ray powder diffraction patterns showing the structural transformation from orthorhombic to tetragonal cell.

  4. Unified Solar

    Broader source: Energy.gov [DOE]

    Unified Solar is an MIT startup that is commercializing an integrated circuit solution that eliminates most of the adverse effects caused by partial shading in photovoltaic power systems. With its patent-pending design, Unified Solar's solution is smaller, cheaper and more powerful than any competing power optimizer in the market.

  5. Research Update: Interface-engineered oxygen octahedral tilts in perovskite oxide heterostructures

    SciTech Connect (OSTI)

    Kan, Daisuke Aso, Ryotaro; Kurata, Hiroki; Shimakawa, Yuichi

    2015-06-01

    Interface engineering of structural distortions is a key for exploring the functional properties of oxide heterostructures and superlattices. In this paper, we report on our comprehensive investigations of oxygen octahedral distortions at the heterointerface between perovskite oxides SrRuO{sub 3} and BaTiO{sub 3} on GdScO{sub 3} substrates and of the influences of the interfacially engineered distortions on the magneto-transport properties of the SrRuO{sub 3} layer. Our state-of-the-art annular bright-field imaging in aberration-corrected scanning transmission electron microscopy revealed that the RuO{sub 6} octahedral distortions in the SrRuO{sub 3} layer have strong dependence on the stacking order of the SrRuO{sub 3} and BaTiO{sub 3} layers on the substrate. This can be attributed to the difference in the interfacial octahedral connections. We also found that the stacking order of the oxide layers has a strong impact on the magneto-transport properties, allowing for control of the magnetic anisotropy of the SrRuO{sub 3} layer through interface engineering. Our results demonstrate the significance of the interface engineering of the octahedral distortions on the structural and physical properties of perovskite oxides.

  6. Sandia Energy - Solar Resource Assessment

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

    Solar Resource Assessment Home Stationary Power Energy Conversion Efficiency Solar Energy Photovoltaics Solar Resource Assessment Solar Resource AssessmentTara...

  7. Sandia Energy - Solar Market Transformation

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

    Solar Market Transformation Home Stationary Power Energy Conversion Efficiency Solar Energy Photovoltaics Solar Market Transformation Solar Market TransformationTara...

  8. RADIOISOTOPE INVENTORY FOR TSPA-SR

    SciTech Connect (OSTI)

    C. Leigh; R. Rechard

    2001-01-30

    The total system performance assessment for site recommendation (TSPA-SR), on Yucca Mountain, as a site (if suitable) for disposal of radioactive waste, consists of several models. The Waste Form Degradation Model (i.e, source term) of the TSPA-SR, in turn, consists of several components. The Inventory Component, discussed here, defines the inventory of 26 radioisotopes for three representative waste categories: (1) commercial spent nuclear fuel (CSNF), (2) US Department of Energy (DOE) spent nuclear fuel (DSNF), and (3) high-level waste (HLW). These three categories are contained and disposed of in two types of waste packages (WPs)--CSNF WPs and co-disposal WPs, with the latter containing both DSNF and HLW. Three topics are summarized in this paper: first, the transport of radioisotopes evaluated in the past; second, the development of the inventory for the two WP types; and third, the selection of the most important radioisotopes to track in TSPA-SR.

  9. Octahedral tilt transitions in the relaxor ferroelectric Na{sub 1/2}Bi{sub 1/2}TiO{sub 3}

    SciTech Connect (OSTI)

    Meyer, Kai-Christian Gröting, Melanie; Albe, Karsten

    2015-07-15

    The kinetics of octahedral tilt transitions in the lead-free relaxor material sodium bismuth titanate Na{sub 1/2}Bi{sub 1/2}TiO{sub 3} (NBT) is investigated by electronic structure calculations within density functional theory. Energy barriers for transitions between tetragonal, rhombohedral and orthorhombic tilts in cation configurations with [001]- and [111]-order on the A-sites are determined by nudged elastic band calculations. By tilting entire layers of octahedra simultaneously we find that the activation energy is lower for structures with 001-order compared to such with 111-order. The energetic coupling between differently tilted layers is, however, negligibly small. By introducing a single octahedral defect we create local tilt disorder and find that the deformation energy of the neighboring octahedra is less in a rhombohedral than in a tetragonal structure. By successively increasing the size of clusters of orthorhombic defects in a rhombohedral matrix with 001-order, we determine a critical cluster size of about 40 Å . Thus groups of about ten octahedra can be considered as nuclei for polar nanoregions, which are the cause of the experimentally observed relaxor behavior of NBT. - Graphical abstract: Nine orthorhombic oxygen octahedral tilt defects in a rhombohedral tilt configuration. - Highlights: • Chemical order influences energy barriers of octahedral tilt transitions. • The octahedral deformation energy is lower in rhombohedral phases. • Tilt defect clusters are more likely in rhombohedral structures. • Tilt defect clusters can act as nuclei for polar nanoregions.

  10. Solar Two

    SciTech Connect (OSTI)

    Not Available

    1998-04-01

    Solar Two is a concentrating solar power plant that can supply electric power on demand to the local utility, Southern California Edison Company. It can do so because it operates not only during sunny parts of the day, but it can store enough thermal energy from the sun to operate during cloudy periods and after dark, for up to three hours, at its rated output of 10 megawatts (MW). For the first time ever, a utility scale solar power plant can supply electricity when the utility needs it most, to satisfy the energy requirements of its customers.

  11. Solar Millenium Ridgecrest Solar Power Plant | Open Energy Information

    Open Energy Info (EERE)

    Ridgecrest Solar Power Plant Jump to: navigation, search Name Solar Millenium Ridgecrest Solar Power Plant Facility Solar Millenium Ridgecrest Sector Solar Facility Type...

  12. SES Solar Three Project Solar Power Plant | Open Energy Information

    Open Energy Info (EERE)

    Three Project Solar Power Plant Jump to: navigation, search Name SES Solar Three Project Solar Power Plant Facility SES Solar Three Project Sector Solar Facility Type Photovoltaics...

  13. Renewable Energy Concepts Solar Inc REC Solar | Open Energy Informatio...

    Open Energy Info (EERE)

    Concepts Solar Inc REC Solar Jump to: navigation, search Name: Renewable Energy Concepts Solar Inc (REC Solar) Place: San Luis Obispo, California Zip: 93401 Sector: Solar Product:...

  14. Entanglement, avoided crossings, and quantum chaos in an Ising model with a tilted magnetic field

    SciTech Connect (OSTI)

    Karthik, J.; Sharma, Auditya; Lakshminarayan, Arul [Department of Physics, Indian Institute of Technology Madras, Chennai 600036 (India)

    2007-02-15

    We study a one-dimensional Ising model with a magnetic field and show that tilting the field induces a transition to quantum chaos. We explore the stationary states of this Hamiltonian to show the intimate connection between entanglement and avoided crossings. In general, entanglement gets exchanged between the states undergoing an avoided crossing with an overall enhancement of multipartite entanglement at the closest point of approach, simultaneously accompanied by diminishing two-body entanglement as measured by concurrence. We find that both for stationary as well as nonstationary states, nonintegrability leads to a destruction of two-body correlations and distributes entanglement more globally.

  15. Dual-frequency terahertz emission from splitting filaments induced by lens tilting in air

    SciTech Connect (OSTI)

    Zhang, Zhelin; Chen, Yanping Yang, Liu; Yuan, Xiaohui; Liu, Feng; Chen, Min; Xu, Jianqiu; Zhang, Jie; Sheng, Zhengming

    2014-09-08

    Dual-frequency terahertz radiation from air-plasma filaments produced with two-color lasers in air has been demonstrated experimentally. When a focusing lens is tilted for a few degrees, it is shown that the laser filament evolves from a single one to two sub-filaments. Two independent terahertz sources emitted from the sub-filaments with different frequencies and polarizations are identified, where the frequency of terahertz waves from the trailing sub-filament is higher than that from the leading sub-filament.

  16. solar energy

    National Nuclear Security Administration (NNSA)

    8%2A en Solar power purchase for DOE laboratories http:nnsa.energy.govmediaroompressreleasessolarpower

  17. solar power

    National Nuclear Security Administration (NNSA)

    9%2A en Solar power purchase for DOE laboratories http:nnsa.energy.govmediaroompressreleasessolarpower

  18. Solar Rights

    Broader source: Energy.gov [DOE]

    In June of 2015, SB 1626 was signed into law. It provides that during the development period, the developer may only prohibit  a property owner from installing solar in developments with 50 or...

  19. Solar interior and atmosphere

    SciTech Connect (OSTI)

    Cox, A.N.; Livingston, W.C.; Matthews, M.S. National Solar Observatory, Tucson, AZ )

    1991-01-01

    The present work discusses nuclear energy generation in the solar interior, solar neutrino experiments, solar premain-sequence evolution, the computation of standard solar models, radiative-zone mixing, solar element separation by atomic diffusion, the observation and theory of solar oscillations, the solar internal rotation and magnetism implications of oscillations, solar gravity modes, and solar oscillation-mode excitation. Also discussed are the solar spectrum, the role of the solar photosphere and a radiative boundary, high spatial-resolution techniques for solar study, high-resolution observations of the solar granulation, large-scale velocity fields, the solar activity cycle, the magnetic fields of active regions and sunspots, the physics of flux tubes and filigrees, the heating of the solar chromosphere, the fine structure of the solar transition region, coronal activity, the coronal origins of the solar winds, and postmain sequence solar evolution.

  20. SBM Solar | Open Energy Information

    Open Energy Info (EERE)

    search Name: SBM Solar Place: North Carolina Sector: Solar Product: SBM Solar is a solar panel manufacturer based in North Carolina. References: SBM Solar1 This article is...

  1. Akeena Solar | Open Energy Information

    Open Energy Info (EERE)

    Akeena Solar Jump to: navigation, search Logo: Akeena Solar Name: Akeena Solar Address: 16005 Los Gatos Blvd. Place: Los Gatos, California Zip: 95032 Sector: Solar Product: Solar...

  2. Adobe Solar | Open Energy Information

    Open Energy Info (EERE)

    Adobe Solar Jump to: navigation, search Logo: Adobe Solar Name: Adobe Solar Place: Denver, Colorado Region: Rockies Area Sector: Solar Product: solar electric systems Phone Number:...

  3. Climatic Solar | Open Energy Information

    Open Energy Info (EERE)

    Climatic Solar Jump to: navigation, search Logo: Climatic Solar Name: Climatic Solar Address: 650 2nd Lane Place: Vero Beach, Florida Zip: 32962 Sector: Solar Product: solar energy...

  4. Tejas Solares | Open Energy Information

    Open Energy Info (EERE)

    Tejas Solares Jump to: navigation, search Name: Tejas Solares Place: Spain Sector: Solar Product: Tejas Solares is a Spain-based company focused on providing solar solutions for...

  5. Oxford Solar | Open Energy Information

    Open Energy Info (EERE)

    Oxford Solar Jump to: navigation, search Name: Oxford Solar Place: Randolph, New Jersey Zip: 7869 Sector: Solar Product: Oxford Solar provides solar energy consulting and...

  6. Solar Kit Lessons

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

    Solar Kit Lessons Middle School Curriculum Created by Northeast Sustainable Energy Association (NESEA) Click on the links below to take you to the Chapter heading: Solar Cell Inquiry Sunshine Timer Parts of a Solar Panel Part 1 Parts of a Solar Panel Part 2 Build a Simple Ammeter Solar-Powered Battery Charger Positioning Solar Panels 1 Positioning Solar Panels 2 Properties of Solar Radiation: Reflection, Transmission, and Absorption Properties of Solar Radiation: Direct and Diffuse Light Power

  7. NREL: Solar STAT Blog -

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

    Outreach Policy Basics Publications Request Assistance Technical Assistance Project Map Solar STAT Blog The Solar STAT blog discusses state and local efforts to develop solar...

  8. Solar Resource Assessment

    Broader source: Energy.gov [DOE]

    DOE solar resource research focuses on understanding historical solar resource patterns and making future predictions, both of which are needed to support reliable power system operation. As solar...

  9. Thermal conductivity of Bi{sub 2}Te{sub 3} tilted nanowires, a molecular dynamics study

    SciTech Connect (OSTI)

    Li, Shen Lacroix, David; Termentzidis, Konstantinos; Chaput, Laurent; Stein, Nicolas; Frantz, Cedric

    2015-06-08

    Evidence for an excellent compromise between structural stability and low thermal conductivity has been achieved with tilted Bi{sub 2}Te{sub 3} nanowires. The latter ones were recently fabricated and there is a need in modeling and characterization. The structural stability and the thermal conductivity of Bi{sub 2}Te{sub 3} nanowires along the tilted [015]* direction and along the [010] direction have been explored. For the two configurations of nanowires, the effect of the length and the cross section on the thermal conductivity is discussed. The thermal conductivity of infinite size tilted nanowire is 0.34?W/m K, significantly reduced compared to nanowire along the [010] direction (0.59?W/m K). This reveals that in Bi{sub 2}Te{sub 3} nanowires the structural anisotropy can be as important as size effects to reduce the thermal conductivity. The main reason is the reduction of the phonon mean free path which is found to be 1.7?nm in the tilted nanowires, compared to 5.3?nm for the nanowires along the [010] direction. The fact that tilted Bi{sub 2}Te{sub 3} nanowire is mechanically stable and it has extremely low thermal conductivity suggests these nanowires as a promising material for future thermoelectric generation application.

  10. THE TRANSIT INGRESS AND THE TILTED ORBIT OF THE EXTRAORDINARILY ECCENTRIC EXOPLANET HD 80606b

    SciTech Connect (OSTI)

    Winn, Joshua N.; Howard, Andrew W.; Marcy, Geoffrey W.; Johnson, John Asher; Gazak, J. Zachary; Starkey, Donn; Ford, Eric B.; Colon, Knicole D.; Reyes, Francisco; Nortmann, Lisa; Dreizler, Stefan; Odewahn, Stephen; Welsh, William F.; Kadakia, Shimonee; Vanderbei, Robert J.; Adams, Elisabeth R.; Lockhart, Matthew; Crossfield, Ian J.; Valenti, Jeff A.; Dantowitz, Ronald

    2009-10-01

    We present the results of a transcontinental campaign to observe the 2009 June 5 transit of the exoplanet HD 80606b. We report the first detection of the transit ingress, revealing the transit duration to be 11.64 +- 0.25 hr and allowing more robust determinations of the system parameters. Keck spectra obtained at midtransit exhibit an anomalous blueshift, giving definitive evidence that the stellar spin axis and planetary orbital axis are misaligned. The Keck data show that the projected spin-orbit angle lambda is between 32 deg. and 87 deg. with 68.3% confidence and between 14 deg. and 142 deg. with 99.73% confidence. Thus, the orbit of this planet is not only highly eccentric (e = 0.93) but is also tilted away from the equatorial plane of its parent star. A large tilt had been predicted, based on the idea that the planet's eccentric orbit was caused by the Kozai mechanism. Independently of the theory, it is worth noting that all three exoplanetary systems with known spin-orbit misalignments have massive planets on eccentric orbits, suggesting that those systems migrate through a different channel than lower mass planets on circular orbits.

  11. Solar heating and hot water system installed at St. Louis, Missouri. Final report

    SciTech Connect (OSTI)

    Not Available

    1980-04-01

    Information is provided on the solar heating and hot water system installed at the William Tao and Associates, Inc., office building in St. Louis, Missouri. The information consists of description, photos, maintenance and construction problems, final drawing, system requirements and manufacturer's component data. The solar system was designed to provide 50% of the hot water requirements and 45% of the space heating needs for a 900 square foot office space and drafting room. The solar facility has 252 square foot of glass tube concentrator collectors and a 1000 gallon steel storage tank buried below a concrete slab floor. Freeze protection is provided by a propylene glycol/water mixture in the collector loop. The collectors are roof mounted on a variable tilt array which is adjusted seasonally and is connected to the solar thermal storage tank by a tube-in-shell heat exchanger. Incoming city water is preheated through the solar energy thermal storage tank.

  12. SOLAR CYCLE PROPAGATION, MEMORY, AND PREDICTION: INSIGHTS FROM A CENTURY OF MAGNETIC PROXIES

    SciTech Connect (OSTI)

    Munoz-Jaramillo, Andres; DeLuca, Edward E.; Dasi-Espuig, Maria; Balmaceda, Laura A. E-mail: edeluca@cfa.harvard.edu E-mail: lbalmaceda@icate-conicet.gob.ar

    2013-04-20

    The solar cycle and its associated magnetic activity are the main drivers behind changes in the interplanetary environment and Earth's upper atmosphere (commonly referred to as space weather). These changes have a direct impact on the lifetime of space-based assets and can create hazards to astronauts in space. In recent years there has been an effort to develop accurate solar cycle predictions (with aims at predicting the long-term evolution of space weather), leading to nearly a hundred widely spread predictions for the amplitude of solar cycle 24. A major contributor to the disagreement is the lack of direct long-term databases covering different components of the solar magnetic field (toroidal versus poloidal). Here, we use sunspot area and polar faculae measurements spanning a full century (as our toroidal and poloidal field proxies) to study solar cycle propagation, memory, and prediction. Our results substantiate predictions based on the polar magnetic fields, whereas we find sunspot area to be uncorrelated with cycle amplitude unless multiplied by area-weighted average tilt. This suggests that the joint assimilation of tilt and sunspot area is a better choice (with aims to cycle prediction) than sunspot area alone, and adds to the evidence in favor of active region emergence and decay as the main mechanism of poloidal field generation (i.e., the Babcock-Leighton mechanism). Finally, by looking at the correlation between our poloidal and toroidal proxies across multiple cycles, we find solar cycle memory to be limited to only one cycle.

  13. Solar resources

    SciTech Connect (OSTI)

    Hulstrom, R.L.

    1989-01-01

    Following the 1973 oil embargo, the US government initiated a program to develop and use solar energy. This led to individual programs devoted to developing various solar radiation energy conversion technologies: photovoltaic and solar-thermal conversion devices. Nearly concurrently, it was recognized that understanding the available insolation resources was required to develop and deploy solar energy devices and systems. It was also recognized that the insolation information available at that time (1973) was not adequate to meet the specific needs of the solar energy community. Federal efforts were initiated and conducted to produce new and more extensive information and data. The primary federal agencies that undertook such efforts were the Department of Energy (DOE) and the National Oceanic and Atmospheric Administration (NOAA). NOAA's efforts included activities performed by the National Weather Service (NWS) and the National Climatic Data Center (NCDC). This book has two man objectives: to report some of the insolation energy data, information, and products produced by the federal efforts and to describe how they were produced. Products include data bases, models and algorithms, monitoring networks, instrumentation, and scientific techniques. The scope of products and results does not include all those produced by past federal efforts. The book's scope and subject matter are oriented to support the intent and purpose of the other volumes in this series. In some cases, other pertinent material is presented to provide a more complete coverage of a given subject. 385 refs., 149 figs., 50 tabs.

  14. Observation of tilting activities in translated field reversed configuration plasma using computer tomography at two different cross sections

    SciTech Connect (OSTI)

    Yoshimura, Satoru; Sugimoto, Satoshi; Okada, Shigefumi

    2007-11-15

    Tilting activities of field reversed configuration (FRC) plasma were observed in translation experiments using computer tomography (CT) at two different cross sections in the FRC injection experiment (FIX) machine [S. Okada et al., Nucl. Fusion 47, 677 (2007)]. In these experiments, two sets of CT devices were installed at the upstream and downstream sides of the confinement chamber of the FIX. Each CT device was composed of three arrays of detectors sensitive to the near-infrared radiation. The peak of the reconstructed emission profile at one side was displaced from the center of the cross section of the chamber. On the other hand, the reconstructed profile at the other side was located around the center. This result suggests that the FRC plasma was tilting in the axial direction. The occurrence of the observed tilting activities had almost no effect on the lifetime of the FRC plasma.

  15. MODULATION OF GALACTIC COSMIC RAYS OBSERVED AT L1 IN SOLAR CYCLE 23

    SciTech Connect (OSTI)

    Fludra, A.

    2015-01-20

    We analyze a unique 15yr record of galactic cosmic-ray (GCR) measurements made by the SOHO Coronal Diagnostic Spectrometer NIS detectors, recording integrated GCR numbers with energies above 1.0GeV between 1996 July and 2011 June. We are able to closely reproduce the main features of the SOHO/CDS GCR record using the modulation potential calculated from neutron monitor data by Usoskin etal. The GCR numbers show a clear solar cycle modulation: they decrease by 50% from the 1997 minimum to the 2000 maximum of the solar cycle, then return to the 1997 level in 2007 and continue to rise, in 2009 December reaching a level 25% higher than in 1997. This 25% increase is in contrast with the behavior of Ulysses/KET GCR protons extrapolated to 1 AU in the ecliptic plane, showing the same level in 2008-2009 as in 1997. The GCR numbers are inversely correlated with the tilt angle of the heliospheric current sheet. In particular, the continued increase of SOHO/CDS GCRs from 2007 until 2009 is correlated with the decrease of the minimum tilt angle from 30 in mid-2008 to 5 in late 2009. The GCR level then drops sharply from 2010 January, again consistent with a rapid increase of the tilt angle to over 35. This shows that the extended 2008 solar minimum was different from the 1997 minimum in terms of the structure of the heliospheric current sheet.

  16. Solar Equipment Certification

    Broader source: Energy.gov [DOE]

    Under the Solar Energy Standards Act of 1976, the Florida Solar Energy Center (FSEC) is responsible for certifying all solar equipment sold in Florida. A manufacturer who wishes to have their solar...

  17. Role of SrMoO{sub 4} in Sr{sub 2}MgMoO{sub 6} synthesis

    SciTech Connect (OSTI)

    Vasala, S.; Yamauchi, H.; Karppinen, M.

    2011-05-15

    Here we investigate the elemental and phase compositions during the solid-state synthesis of the promising SOFC-anode material, Sr{sub 2}MgMoO{sub 6}, and demonstrate that molybdenum does not notably evaporate under the normal synthesis conditions with temperatures up to 1200 {sup o}C due to the formation of SrMoO{sub 4} as an intermediate product at low temperatures, below 600 {sup o}C. However, partial decomposition of the Sr{sub 2}MgMoO{sub 6} phase becomes evident at the higher temperatures ({approx}1500 {sup o}C). The effect of SrMoO{sub 4} on the electrical conductivity of Sr{sub 2}MgMoO{sub 6} is evaluated by preparing a series of Sr{sub 2}MgMoO{sub 6} samples with different amounts of additional SrMoO{sub 4}. Under the reducing operation conditions of an SOFC anode the insulating SrMoO{sub 4} phase is apparently reduced to the highly conductive SrMoO{sub 3} phase. Percolation takes place with 20-30 wt% of SrMoO{sub 4} in a Sr{sub 2}MgMoO{sub 6} matrix, with a notable increase in electrical conductivity after reduction. Conductivity values of 14, 60 and 160 S/cm are determined at 800 {sup o}C in 5% H{sub 2}/Ar for the Sr{sub 2}MgMoO{sub 6} samples with 30, 40 and 50 wt% of added SrMoO{sub 4}, respectively. -- Graphical abstract: SrMoO{sub 4} is formed at low temperatures during the synthesis of Sr{sub 2}MgMoO{sub 6}, which prevents the volatilization of Mo from typical precursor mixtures of this promising SOFC anode material. SrMoO{sub 4} is insulating and it is often found as an impurity in Sr{sub 2}MgMoO{sub 6} samples. It is however readily reduced to highly conducting SrMoO{sub 3}. Composites of Sr{sub 2}MgMoO{sub 6} and SrMoO{sub 3} show increased electrical conductivities compared to pure Sr{sub 2}MgMoO{sub 6} under the reductive operation conditions of an SOFC anode. Display Omitted Highlights: {yields} Sr{sub 2}MgMoO{sub 6} is a promising SOFC anode material. {yields} During the Sr{sub 2}MgMoO{sub 6} synthesis SrMoO{sub 4} is formed at low

  18. Solar Neutrinos

    DOE R&D Accomplishments [OSTI]

    Davis, R. Jr.; Harmer, D. S.

    1964-12-01

    The prospect of studying the solar energy generation process directly by observing the solar neutrino radiation has been discussed for many years. The main difficulty with this approach is that the sun emits predominantly low energy neutrinos, and detectors for observing low fluxes of low energy neutrinos have not been developed. However, experimental techniques have been developed for observing neutrinos, and one can foresee that in the near future these techniques will be improved sufficiently in sensitivity to observe solar neutrinos. At the present several experiments are being designed and hopefully will be operating in the next year or so. We will discuss an experiment based upon a neutrino capture reaction that is the inverse of the electron-capture radioactive decay of argon-37. The method depends upon exposing a large volume of a chlorine compound, removing the radioactive argon-37 and observing the characteristic decay in a small low-level counter.

  19. Solar ADEPT: Efficient Solar Energy Systems

    SciTech Connect (OSTI)

    2011-01-01

    Solar ADEPT Project: The 7 projects that make up ARPA-E's Solar ADEPT program, short for 'Solar Agile Delivery of Electrical Power Technology,' aim to improve the performance of photovoltaic (PV) solar energy systems, which convert the sun's rays into electricity. Solar ADEPT projects are integrating advanced electrical components into PV systems to make the process of converting solar energy to electricity more efficient.

  20. Creating solar media nets solar tools, publicity

    SciTech Connect (OSTI)

    Brewer, B.

    1980-01-01

    The utilization of locally produced solar tool to gain more access to commercial media is discussed. Central is a strategy of (1) giving commercial media something to report, (2) helping educate the media, and (3) simultaneously impacting that portion of the public which is likely to be most interested. Methods for reaching several target audiences include a Solar Calendar, a Passive Solar Film, a local Solar Directory, a local Solar Information Center, an Emergency Coolth brochure and a Conservation/Solar Retrofit Guide.

  1. Concentrating Solar Power

    SciTech Connect (OSTI)

    Not Available

    2008-09-01

    Summarizes the goals and activities of the DOE Solar Energy Technologies Program efforts within its concentrating solar power subprogram.

  2. VISUAL-SOLAR

    Energy Science and Technology Software Center (OSTI)

    003661IBMPC00 Visual-SOLAR: Modeling and Visualization of Solar Radiation Potential on Individual Building Rooftops

  3. Solar Easements & Local Option Solar Rights Laws

    Broader source: Energy.gov [DOE]

    Utah's solar easement provision is similar to easement provisions in many other states. Parties may voluntarily enter into written solar easement contracts that are enforceable by law. An...

  4. Solar Energy Technologies Program: Concentrating Solar Power

    SciTech Connect (OSTI)

    2009-10-26

    Fact sheet summarizing the goals and activities of the DOE Solar Energy Technologies Program efforts within its concentrating solar power subprogram.

  5. Concentrating Solar Power Projects | Concentrating Solar Power...

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

    SolarPACES, an international program of the International Energy Agency, furthers collaborative development, testing, and marketing of concentrating solar power plants. Activities ...

  6. Three-dimensional microelectromechanical tilting platform operated by gear-driven racks

    DOE Patents [OSTI]

    Klody, Kelly A.; Habbit, Jr., Robert D.

    2005-11-01

    A microelectromechanical (MEM) tiltable-platform apparatus is disclosed which utilizes a light-reflective platform (i.e. a micromirror) which is supported above a substrate by flexures which can be bent upwards to tilt the platform in any direction over an angle of generally .+-.10 degrees using a gear-driven rack attached to each flexure. Each rack is driven by a rotary microengine (i.e. a micromotor); and an optional thermal actuator can be used in combination with each microengine for initially an initial uplifting of the platform away from the substrate. The MEM apparatus has applications for optical switching (e.g. between a pair of optical fibers) or for optical beam scanning.

  7. Bose-Einstein condensates on tilted lattices: Coherent, chaotic, and subdiffusive dynamics

    SciTech Connect (OSTI)

    Kolovsky, Andrey R.; Gomez, Edgar A.; Korsch, Hans Juergen

    2010-02-15

    The dynamics of a (quasi-) one-dimensional interacting atomic Bose-Einstein condensate in a tilted optical lattice is studied in a discrete mean-field approximation, i.e., in terms of the discrete nonlinear Schroedinger equation. If the static field is varied, the system shows a plethora of dynamical phenomena. In the strong field limit, we demonstrate the existence of (almost) nonspreading states which remain localized on the lattice region populated initially and show coherent Bloch oscillations with fractional revivals in the momentum space (so-called quantum carpets). With decreasing field, the dynamics becomes irregular, however, still confined in configuration space. For even weaker fields, we find subdiffusive dynamics with a wave-packet width growing as t{sup 1/4}.

  8. AV Solar Ranch I Solar Power Plant | Open Energy Information

    Open Energy Info (EERE)

    AV Solar Ranch I Solar Power Plant Jump to: navigation, search Name AV Solar Ranch I Solar Power Plant Facility AV Solar Ranch I Sector Solar Facility Type Photovoltaic Developer...

  9. Test Problem: Tilted Rayleigh-Taylor for 2-D Mixing Studies

    SciTech Connect (OSTI)

    Andrews, Malcolm J.; Livescu, Daniel; Youngs, David L.

    2012-08-14

    The 'tilted-rig' test problem originates from a series of experiments (Smeeton & Youngs, 1987, Youngs, 1989) performed at AWE in the late 1980's, that followed from the 'rocket-rig' experiments (Burrows et al., 1984; Read & Youngs, 1983), and exploratory experiments performed at Imperial College (Andrews, 1986; Andrews and Spalding, 1990). A schematic of the experiment is shown in Figure 1, and comprises a tank filled with light fluid above heavy, and then 'tilted' on one side of the apparatus, thus causing an 'angled interface' to the acceleration history due to rockets. Details of the configuration given in the next chapter include: fluids, dimensions, and other necessary details to simulate the experiment. Figure 2 shows results from two experiments, Case 110 (which is the source for this test problem) that has an Atwood number of 0.5, and Case 115 (a secondary source described in Appendix B), with Atwood of 0.9 Inspection of the photograph in Figure 2 (the main experimental diagnostic) for Case 110. reveals two main areas for mix development; 1) a large-scale overturning motion that produces a rising plume (spike) on the left, and falling plume (bubble) on the right, that are almost symmetric; and 2) a Rayleigh-Taylor driven mixing central mixing region that has a large-scale rotation associated with the rising and falling plumes, and also experiences lateral strain due to stretching of the interface by the plumes, and shear across the interface due to upper fluid moving downward and to the right, and lower fluid moving upward and to the left. Case 115 is similar but differs by a much larger Atwood of 0.9 that drives a strong asymmetry between a left side heavy spike penetration and a right side light bubble penetration. Case 110 is chosen as the source for the present test problem as the fluids have low surface tension (unlike Case 115) due the addition of a surfactant, the asymmetry small (no need to have fine grids for the spike), and there is extensive

  10. Uranium vacancy mobility at the Σ5 symmetric tilt and Σ5 twist grain boundaries in UO₂

    SciTech Connect (OSTI)

    Uberuaga, Blas Pedro; Andersson, David A.

    2015-10-01

    Ionic transport at grain boundaries in oxides dictates a number of important phenomena, from ionic conductivity to sintering to creep. For nuclear fuels, it also influences fission gas bubble nucleation and growth. Here, using a combination of atomistic calculations and object kinetic Monte Carlo (okMC) simulations, we examine the kinetic pathways associated with uranium vacancies at two model grain boundaries in UO2. The barriers for vacancy motion were calculated using the nudged elastic band method at all uranium sites at each grain boundary and were used as the basis of the okMC simulations. For both boundaries considered – a simple tilt and a simple twist boundary – the mobility of uranium vacancies is significantly higher than in the bulk. For the tilt boundary, there is clearly preferred migration along the tilt axis as opposed to in the perpendicular direction while, for the twist boundary, migration is essentially isotropic within the boundary plane. These results show that cation defect mobility in fluorite-structured materials is enhanced at certain types of grain boundaries and is dependent on the boundary structure with the tilt boundary exhibiting higher rates of migration than the twist boundary.

  11. Uranium vacancy mobility at the Σ5 symmetric tilt and Σ5 twist grain boundaries in UO₂

    DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)

    Uberuaga, Blas Pedro; Andersson, David A.

    2015-10-01

    Ionic transport at grain boundaries in oxides dictates a number of important phenomena, from ionic conductivity to sintering to creep. For nuclear fuels, it also influences fission gas bubble nucleation and growth. Here, using a combination of atomistic calculations and object kinetic Monte Carlo (okMC) simulations, we examine the kinetic pathways associated with uranium vacancies at two model grain boundaries in UO2. The barriers for vacancy motion were calculated using the nudged elastic band method at all uranium sites at each grain boundary and were used as the basis of the okMC simulations. For both boundaries considered – a simplemore » tilt and a simple twist boundary – the mobility of uranium vacancies is significantly higher than in the bulk. For the tilt boundary, there is clearly preferred migration along the tilt axis as opposed to in the perpendicular direction while, for the twist boundary, migration is essentially isotropic within the boundary plane. These results show that cation defect mobility in fluorite-structured materials is enhanced at certain types of grain boundaries and is dependent on the boundary structure with the tilt boundary exhibiting higher rates of migration than the twist boundary.« less

  12. Fabrication of Sr silicate buffer layer on Si(100) substrate by pulsed laser deposition using a SrO target

    SciTech Connect (OSTI)

    Imanaka, Atsuhiro; Sasaki, Tsubasa; Hotta, Yasushi Satoh, Shin-ichi

    2014-09-01

    The authors fabricated 2??1 Sr-reconstructed Si(100) substrates using thin SrO layers, and used them to direct growth of crystalline perovskite oxide on Si. The SrO layers used to reconstruct the Si(100) substrates were grown by pulsed laser deposition from a SrO single crystal target, followed by postdeposition-annealing (PDA) of the SrO/Si(100) structure. In situ observations of reflective high-energy electron diffraction during PDA confirmed a 2??1 reconstruction of the Si surface and x-ray photoemission spectroscopy of the annealed samples confirmed the existence of Sr atoms in a silicate phase, which indicated that a 2??1 Sr-reconstructed Si surface was achieved. The optimal fabrication conditions were annealing at 720?C for 1?min and an equivalent SrO layer thickness (ML{sub eq}) of 2.5 ML{sub eq}. The temperature condition was very narrow, at 720??20?C, for an acceptable product. Subsequently, the authors demonstrated the growth of crystalline SrTiO{sub 3} films on the 2??1 Sr-reconstructed Si(100) surfaces.

  13. Early solar mass loss, opacity uncertainties, and the solar abundance...

    Office of Scientific and Technical Information (OSTI)

    Early solar mass loss, opacity uncertainties, and the solar abundance problem Citation Details In-Document Search Title: Early solar mass loss, opacity uncertainties, and the solar ...

  14. Portland, Oregon: Solar in Action (Brochure), Solar America Cities...

    Office of Environmental Management (EM)

    Portland, Oregon: Solar in Action (Brochure), Solar America Cities, Energy Efficiency & Renewable Energy (EERE) Portland, Oregon: Solar in Action (Brochure), Solar America Cities, ...

  15. Solar Position Algorithm for Solar Radiation Applications (Revised...

    Office of Scientific and Technical Information (OSTI)

    Solar Position Algorithm for Solar Radiation Applications (Revised) Citation Details In-Document Search Title: Solar Position Algorithm for Solar Radiation Applications (Revised) ...

  16. EE Solar Energy Efficiency Solar | Open Energy Information

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  17. Willard Kelsey Solar Group WK Solar | Open Energy Information

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  18. Innotech Solar AS formerly known as Solar Cell Repower | Open...

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  19. Wuxi Jiacheng Solar Energy Technology Co JC Solar | Open Energy...

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  1. First Solar Electric LLC formerly DT Solar | Open Energy Information

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  10. Ecosystem Solar Electric Corp aka Solar MW Energy Inc | Open...

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  11. ET Solar Group Formerly CNS Solar Industry | Open Energy Information

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  12. Entech Solar Inc formerly WorldWater Solar Technologies | Open...

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  13. Milwaukee, Wisconsin: Solar in Action (Brochure), Solar America...

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    Milwaukee, Wisconsin: Solar in Action (Brochure), Solar America Cities, Energy Efficiency & Renewable Energy (EERE) Milwaukee, Wisconsin: Solar in Action (Brochure), Solar America ...

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    Houston, Texas: Solar in Action (Brochure), Solar America Cities, Energy Efficiency & Renewable Energy (EERE) Houston, Texas: Solar in Action (Brochure), Solar America Cities, ...

  15. edition Not Available 14 SOLAR ENERGY; SOLAR ENERGY; EDUCATIONAL...

    Office of Scientific and Technical Information (OSTI)

    Home economics: student activities. Field test edition Not Available 14 SOLAR ENERGY; SOLAR ENERGY; EDUCATIONAL TOOLS; CURRICULUM GUIDES; GLAZING; HOUSES; SOLAR COOKERS; SOLAR...

  16. EA-1798: Abengoa Solar's Mojave Solar Project near Barstow, CA...

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

    8: Abengoa Solar's Mojave Solar Project near Barstow, CA EA-1798: Abengoa Solar's Mojave Solar Project near Barstow, CA July 1, 2011 EA-1798: Final Environmental Assessment Loan ...

  17. Orlando, Florida: Solar in Action (Brochure), Solar America Cities...

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    Orlando, Florida: Solar in Action (Brochure), Solar America Cities, Energy Efficiency & Renewable Energy (EERE) Orlando, Florida: Solar in Action (Brochure), Solar America Cities,...

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    Denver, Colorado: Solar in Action (Brochure), Solar America Cities, Energy Efficiency & Renewable Energy (EERE) Denver, Colorado: Solar in Action (Brochure), Solar America Cities,...

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    Coast Next Generation Solar Energy Center Solar Power Plant Jump to: navigation, search Name Space Coast Next Generation Solar Energy Center Solar Power Plant Facility Space Coast...

  1. Martin Next Generation Solar Energy Center Solar Power Plant...

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    Antonio, Texas: Solar in Action (Brochure), Solar America Cities, Energy Efficiency & Renewable Energy (EERE) San Antonio, Texas: Solar in Action (Brochure), Solar America Cities, ...

  3. Solar Utility Networks: Replicable Innovations in Solar Energy...

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    Solar Utility Networks: Replicable Innovations in Solar Energy (SUNRISE) Funding Opportunity Solar Utility Networks: Replicable Innovations in Solar Energy (SUNRISE) Funding ...

  4. PROJECT PROFILE: The Solar Foundation - Solar Training Network...

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    Training Network PROJECT PROFILE: The Solar Foundation - Solar Training Network Project Name: Solar Training Network Funding Opportunity: Solar Training and Education for ...

  5. Seattle, Washington: Solar in Action (Brochure), Solar America...

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    Seattle, Washington: Solar in Action (Brochure), Solar America Cities, Energy Efficiency & Renewable Energy (EERE) Seattle, Washington: Solar in Action (Brochure), Solar America ...

  6. EIS-0449: Solar Millennium Blythe Solar Power Project in Riverside...

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

    9: Solar Millennium Blythe Solar Power Project in Riverside County, CA EIS-0449: Solar Millennium Blythe Solar Power Project in Riverside County, CA December 10, 2010 EIS-0449: ...

  7. Solar Impulse's Solar-Powered Plane

    SciTech Connect (OSTI)

    Moniz, Ernest; Piccard, Bertrand; Reicher, Dan

    2013-07-08

    Solar Impulse lands in Washington, DC at Washington Dulles International Airport as part of its journey across the United States. Secretary Ernest Moniz speaks about how advancements like those at the Department of Energy are leading the way for innovations like the solar-powered plane. Footage of the solar-powered plane courtesy of Solar Impulse.

  8. Solar Impulse's Solar-Powered Plane

    ScienceCinema (OSTI)

    Moniz, Ernest; Piccard, Bertrand; Reicher, Dan

    2014-01-07

    Solar Impulse lands in Washington, DC at Washington Dulles International Airport as part of its journey across the United States. Secretary Ernest Moniz speaks about how advancements like those at the Department of Energy are leading the way for innovations like the solar-powered plane. Footage of the solar-powered plane courtesy of Solar Impulse.

  9. Concentrating Solar Power Projects | Department of Energy

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

    Concentrating Solar Power Projects Concentrating Solar Power Projects Concentrating Solar Power Projects Concentrating Solar Power Projects Concentrating Solar Power Projects Concentrating Solar Power Projects Concentrating Solar Power Projects Concentrating Solar Power Projects Concentrating Solar Power Projects Concentrating Solar Power Projects Concentrating Solar Power Projects Concentrating Solar Power Projects Concentrating Solar Power Projects Concentrating Solar Power Projects

  10. Solar engineering 1991

    SciTech Connect (OSTI)

    Mancini, T.R. ); Watanabe, K. ); Klett, D.E. )

    1991-01-01

    This book contains paper presented at the second ASME-JSES-JSME international solar energy conference. It is organized under the following headings: Solar ponds, Energy fundamentals in solar systems, General solar energy, Solar powered cars, Distributed receiver components and systems, Central receiver components and systems, Chemical processes and waste destruction, High flux and innovative applications, Solar thermal space propulsion, Solar dynamic power systems, Analysis methods for monitored building use. Photovoltaics, Testing and measurement.

  11. Solar collector

    SciTech Connect (OSTI)

    Wilhelm, W.G.

    1982-05-04

    The field of this invention is solar collectors, and more particularly, the invention pertains to a flat plate collector that employs high performance thin films. The solar collector of this invention overcomes several problems in this field, such as excessive hardware, cost and reliability, and other prior art drawbacks outlined in the specification. In the preferred form, the apparatus features a substantially rigid planar frame. A thin film window is bonded to one planar side of the frame. An absorber of laminate construction is comprised of two thin film layers that are sealed perimetrically. The layers define a fluid-tight planar envelope of large surface area to volume through which a heat transfer fluid flows. Absorber is bonded to the other planar side of the frame. The thin film construction of the absorber assures substantially full envelope wetting and thus good efficiency. The window and absorber films stress the frame adding to the overall strength of the collector.

  12. Corona Solar | Open Energy Information

    Open Energy Info (EERE)

    Solar Jump to: navigation, search Name: Corona Solar Place: Tholey-Theley, Germany Zip: D 66636 Sector: Solar Product: Engaged in solar passive large-size collectors. References:...

  13. AS Solar | Open Energy Information

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    Solar Jump to: navigation, search Name: AS Solar Address: Am Tnniesberg 4A Place: Hannover, Germany Sector: Solar Product: PV, solar thermal Phone Number: +49 511 475578 - 0...

  14. Abengoa Solar | Open Energy Information

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    Solar Jump to: navigation, search Logo: Abengoa Solar Name: Abengoa Solar Address: 11500 W 13th Ave Place: Lakewood, Colorado Zip: 80215 Region: Rockies Area Sector: Solar Product:...

  15. First Solar | Open Energy Information

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    First Solar Name: First Solar Address: 350 West Washington Street, Suite 600 Place: Tempe, Arizona Zip: 85281 Sector: Solar Product: Solar energy systems Year Founded: 1999 Phone...

  16. Solar Systems | Open Energy Information

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    Logo: Solar Systems Name: Solar Systems Address: 45 Grosvenor Street Place: Abbotsford, Australia Sector: Solar Product: Solar concentrators Phone Number: +61 3 9413 8000 Website:...

  17. Ascent Solar | Open Energy Information

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    Solar Jump to: navigation, search Logo: Ascent Solar Name: Ascent Solar Address: 12300 Grant Street Place: Thornton, Colorado Zip: 80241 Region: Rockies Area Sector: Solar Product:...

  18. Borrego Solar | Open Energy Information

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    Borrego Solar Jump to: navigation, search Logo: Borrego Solar Name: Borrego Solar Address: 2560 9th Street Place: Berkeley, California Zip: 94710 Region: Bay Area Sector: Solar...

  19. DPW Solar | Open Energy Information

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    DPW Solar Jump to: navigation, search Logo: DPW Solar Name: DPW Solar Address: 4000 B Vassar Dr. NE Place: Albuquerque, New Mexico Zip: 87107 Sector: Solar Product: Renewable...

  20. Inovateus Solar | Open Energy Information

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    Inovateus Solar Jump to: navigation, search Logo: Inovateus Solar Name: Inovateus Solar Address: 19890 State Line Rd. Place: South Bend, Indiana Zip: 46637 Sector: Solar Product:...

  1. Standard Solar | Open Energy Information

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    Standard Solar Name: Standard Solar Address: 202 Perry Parkway Place: Gaithersburg, Maryland Zip: 20877 Region: Northeast - NY NJ CT PA Area Sector: Solar Product: Solar...

  2. Wasatch Solar | Open Energy Information

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    Solar Jump to: navigation, search Name: Wasatch Solar Address: 4417 S 2950 E Place: Salt Lake City, Utah Zip: 84124 Sector: Solar Product: Solar Year Founded: 2009 Phone...

  3. Sylcom Solar | Open Energy Information

    Open Energy Info (EERE)

    Sylcom Solar provides the design, research, distribution, construction, operation, maintenance of products and of Photovoltaic Solar, Thermal Solar and Solar Thermoelectric...

  4. Shell Solar | Open Energy Information

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    Solar Jump to: navigation, search Name: Shell Solar Place: The Hague, Netherlands Zip: 2501 AN Sector: Solar Product: Shell Solar is developing non-crystalline PV technology,...

  5. Apex Solar | Open Energy Information

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    Name: Apex Solar Place: Sofia, Bulgaria Zip: 1616 Sector: Solar Product: Bulgarian PV and solar thermal project developer and installer. References: Apex Solar1 This article is a...

  6. Atlantic Solar | Open Energy Information

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    navigation, search Logo: Atlantic Solar Name: Atlantic Solar Place: Cape Town, South Africa Sector: Solar Product: Solar Thermal Technology Year Founded: 1985 Phone Number:...

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    San Francisco, California Sector: Solar Product: San Francisco solar installation firm acquired by SolarCity in September 2006. References: Declination Solar1 This article...

  8. Solar Energy | Department of Energy

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    Energy Resource Library Solar Energy Solar Energy Below are resources for Tribes on solar energy technologies. A Guide to Community Solar: Utility, Private, and Nonprofit ...

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    Process Heat Solar Photovoltaics Daylighting Solar Pool Heating Program Info Sector Name State State Kentucky Program Type SolarWind Access Policy Summary In Kentucky, solar ...

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    Preussen Solar Jump to: navigation, search Name: Preussen Solar Place: Berlin, Germany Zip: 10711 Sector: Solar Product: Involved in solar projects. Coordinates: 52.516074,...