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Sample records for dewitt kleberg lavaca

  1. Mercury bioaccumulation in Lavaca Bay, Texas

    E-Print Network [OSTI]

    Palmer, Sally Jo

    1992-01-01

    estuary, Keller Bay. The rate of Hg accumulation in shrimp, Penaeus sp. , blue crabs, Callinectes sapidus, and oysters, Crassostrea virginica and the Hg depuration rate in C. virginica were examined by performing caging experiments.... For the accumulation experiment shrimp from Matagorda Bay, blue crabs from Keller Bay, and oysters from Carancahua Reef in Carancahua Bay were collected and placed in ambient water and sediment of Lavaca and Keller Bays. Oysters were collected in North Lavaca Bay...

  2. Kleberg County, Texas: Energy Resources | Open Energy Information

    Open Energy Info (EERE)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home Page on QA:QAsource History View NewTexas: Energy ResourcesOrderInformationKizildere I Geothermal PwerKleberg County,

  3. Dr. Bon A. Dewitt PUBLICATIONS

    E-Print Network [OSTI]

    Hill, Jeffrey E.

    . Barnes. 2003. "Forest Cover Mapping Using Image Transformation Techniques." Journal of Surveying and Land. "Detection of Positional Errors in Systems Utilizing Small-Format Digital Aerial Imagery and Navigation-433. Dewitt, B.A. 1996. "Initial Approximations for the Three Dimensional Conformal Coordinate Transformation

  4. Acoustic characteristics of bay bottom sediments in Lavaca Bay, TX

    E-Print Network [OSTI]

    Patch, Mary Catherine

    2005-08-29

    . The Lavaca Bay estuary is a drowned river valley containing a history of estuary development in the late Pleistocene and Holocene. We used a chirp sonar to gather acoustic reflection profiles, which were classified to categorize and trace reflectors. The data...

  5. Sedimentary environments and processes in a shallow, Gulf Coast Estuary-Lavaca Bay, Texas.

    E-Print Network [OSTI]

    Bronikowski, Jason Lee

    2004-11-15

    Sedimentation rates in sediment cores from Lavaca Bay have been high within the last 1-2 decays within the central portion of the bay, with small fluctuations from river input. Lavaca Bay is a broad, flat, and shallow (<3 m) microtidal estuary...

  6. The endohelminth fauna of nestlings from a great blue heron (Ardea herodias) population during development from Port Lavaca, Texas

    E-Print Network [OSTI]

    Ross, Lisa Maureen

    1995-01-01

    A study of great blue heron nestlings was undertaken in order to understand trends in the endohelminth fauna of nestling birds as they mature from hatching to fledging. Fourteen birds were collected from Port Lavaca, Texas during the spring of 1994...

  7. The Wheeler - DeWitt Quantum Geometrodynamics: its fundamental problems and tendencies of their resolution

    E-Print Network [OSTI]

    T. P. Shestakova

    2008-01-31

    The paper is devoted to fundamental problems of the Wheeler - DeWitt quantum geometrodynamics, which was the first attempt to apply quantum principles to the Universe as a whole. Our purpose is to find out the origin of these problems and follow up their consequences. We start from Dirac generalized Hamiltonian dynamics as a cornerstone on which the Wheeler - DeWitt theory is based. We remind the main statements of the famous DeWitt's paper of 1967 and discuss the flaws of the theory: the well-known problem of time, the problem of Hilbert space and others. In the concluding part of the paper we consider new tendencies and approaches to quantum geometrodynamics appeared in the last decade.

  8. Kleberg Center - 3

    E-Print Network [OSTI]

    Unknown

    2005-06-30

    trou'badours, who tied the icealized female image to the idea of courtly love. pumility, courtesy, adultery, and the religion of love werc all facets of courtly love. As the idea developed, the concegt of adultery; as repls. ced by the idea... of married love a. . d im' ce of woman as pure, beautiful, and honest emerged in ti e verse of the seventeenth-century poets. These are the thre main charact ristics of the ideal- ized emale that swift satirizes in nis sc- tological poetry. &he 2'ean...

  9. The Niagara Internet Query System Jeffrey Naughton, David DeWitt, David Maier, Ashraf Aboulnaga, Jianjun Chen,

    E-Print Network [OSTI]

    Bertini, Robert L.

    The Niagara Internet Query System Jeffrey Naughton, David DeWitt, David Maier, Ashraf Aboulnaga, merely being an XML query-processing engine does not render a system suitable for querying the Internet, or are infinite streams, or both. The Niagara Internet Query System was designed from the bottom-up to provide

  10. Football - 1930-1939 - 29

    E-Print Network [OSTI]

    Fox Tone Pictures

    2006-01-01

    that the vertical axis is doubly valued to indicate vertical distances relative to the normal and shifted origins. 29 Gravity profiles computed from the cosine model . . 30 Two dimensional inversion model obtained from the gravity anomaly of the cosine model... of interest (Figure 1, p. 2) is a one degree rectangle bounded by 29' and 30' N latitudes and 97' and 98' W longi- tudes, and includes Gonzales County and parts of Guadalupe, Caldwell, Bastrop, Fayette, Lavaca, Dewitt and Wilson counties. The Bouguer...

  11. EIS-0519: Rio Grande LNG Project and Rio Bravo Pipeline Project; Kleberg,

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

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home Page on Delicious Rank EERE:FinancingPetroleum Based|DepartmentStatement |toDepartment ofDepartment of2:Kenedy, Willacy, and

  12. Lavaca County, Texas: Energy Resources | Open Energy Information

    Open Energy Info (EERE)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home Page on QA:QAsource History View NewTexas:Montezuma, Arizona: Energy ResourcesProject |433014°, -82.9931607°

  13. EIS-0494: Excelerate Liquefaction Solutions Lavaca Bay LNG Project, Calhoun

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

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home Page on Delicious Rank EERE:FinancingPetroleum Based|DepartmentStatement |to ConductLarimerFinalDepartmentDepartment ofFinaland

  14. DeWitt County, Texas: Energy Resources | Open Energy Information

    Open Energy Info (EERE)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home Page on QA:QA J-E-1 SECTIONRobertsdale, Alabama (UtilityInstruments IncMississippi: Energy Resources Jump to:DeSoto,

  15. EIS-0494: Excelerate Liquefaction Solutions Lavaca Bay LNG Project, Calhoun and Jackson Counties, Texas

    Broader source: Energy.gov [DOE]

    The Federal Energy Regulatory Commission (FERC) is preparing, with DOE as a cooperating agency, an EIS to analyze the potential environmental impacts of a proposal to construct and operate a liquefied natural gas terminal consisting of two floating liquefaction, storage and offloading units and a 29-mile pipeline header system to transport natural gas from existing pipeline systems to the LNG terminal facilities.

  16. Exploring Hydrodynamic Modeling of Texas Bays With focus on Corpus Christi Bay & Lavaca Bay

    E-Print Network [OSTI]

    Furnans, Jordan

    2004-01-01

    , although likely affected by tides, is from Oso Bay into Corpus Christi Bay. This is because of the power plant located inbetween Oso Bay and Laguna Madre. This plant withdraws cooling water from Laguna Madre in discharges it into Oso Bay. This water... leading to the hypoxia. In order to develop such a model, much environmental and spatial data needed to be collected. This data includes information on regional wind patterns, tidal data, river inflow data, and weather data. It also was necessary...

  17. A Meta-analysis of Mercury Levels in Lavaca Bay Texas

    E-Print Network [OSTI]

    Pillado, Maria C.

    2014-05-07

    meta-analysis to determine if the mercury levels in secondary and tertiary trophic levels have changed between years 1992 and 2012, and if the levels in red drum (Sciaenops ocellatus) and oysters (Crassostrea virginica) have decreased over time...

  18. Dewitt C. Poole and America's intervention in Russia, 1918-1920

    E-Print Network [OSTI]

    Briscoe, Charles Harry

    1972-01-01

    of the American diplomats on the scene. The first objective of this thesis is to look at the personality of DeWi tt Poole as reflected in his memoirs, letters, and official correspondence. One must understand who and what motivated his actions during...Witt Clinton Poole, Jr. was born October 28, 1885, at Vancouver Barracks, Washington, to Captain DeWi tt Clinton Poole and Naria Woodward Pettes Poole. He was named in honor of his paternal grandfather who had been an engineer on the Erie Canal. DeWi tt...

  19. EIS-0519: Rio Grande LNG Project and Rio Bravo Pipeline Project...

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

    (LNG) export terminal and marine facilities on the Brownsville Ship Channel in Cameron County, Texas, and two parallel 140-mile-long natural gas pipelines from Kleberg County,...

  20. An archaeological survey of a 13.8 acre tract of land: The proposed solid waste transfer station site, Lavaca County, Texas

    E-Print Network [OSTI]

    Moore, William

    2015-06-04

    of prehistoric or historic sites. Fieldwork was performed on February 12, 1993 by Brazos Valley Research Associates with William E. Moore acting as Principal Investigator and conducting the survey. The project was conducted under Texas Antiquities Permit Number...

  1. The Chemical Composition of Some Soils of Angelina, Brazoria, Cameron, Cherokee, Delta, Lamar, Hidalgo, Lavaca, Montgomery, Nacogdoches, Robertson, Rusk, Webb and Wilson Counties.

    E-Print Network [OSTI]

    Fraps, G. S. (George Stronach)

    1909-01-01

    and texture and showing a yellowish gray color. The ~rganic matter contained in the first few inches gives the surface soil a grayish color. The topography is rolling with excellent surface drainage. The soil is f*-,;:ly retentive of moisture, and when... overflows. T11e principal timber growth is pecan and ash. This is one of the most desirable soils of the bottom, as it is very fertile. has good drainage, and is easily cultivated. ll'rost of it is under cultivation at present. Sugar cane is thc principal...

  2. Reservoir characterization of the Melbourn and F-39 sands in the Lavaca Bay field using integration of log, core and production data

    E-Print Network [OSTI]

    Hong, Cecelia

    1993-01-01

    ) is an expression for ratio of water saturation in the uninvaded and flushed zones. Rw was estimated using Equaflon (3. 1d) Rmf was obtained from the log heading and corrected to Tf . . (3. 1d) where: K= 60+0. 133 Tf Assumption: R deep = Rt R shallow = Rxo... to conduct electricity and this accounts for Ro ) Rw. Rw is the resistivity of the formation water only. Ro is proportional to Rw The formation factor, F is the proportionality constant. Ro = F~Rw. . . (3. 3a) Using Archie's water saturation equation...

  3. Accurate determination of dielectronic recombination resonances with lithiumlike argon W. Zong, R. Schuch, E. Lindroth, H. Gao, D. R. DeWitt, and S. Asp

    E-Print Network [OSTI]

    Lindroth, Eva

    in the absolute determina tion of the resonance energies. To overcome this problem, an alternative calibration with Ar 151 has been carried out at the ion storage ring CRYRING. The absolute energies of the DR of the beam orbit in the ring. The accuracy in the absolute energy achieved in this experiment was ;1

  4. Parallel Database Systems: The Future of High Performance Database Processing1

    E-Print Network [OSTI]

    Cafarella, Michael J.

    . 94105-2403 dewitt @ cs.wisc.edu Gray @ SFbay.enet.dec.com January 1992 Abstract: Parallel database

  5. 1786 Graduating with Columbia College's first class, Dewitt Clinton becomes the driving force in building the Erie Canal (181725), the largest American engineering project of the early 19th century.

    E-Print Network [OSTI]

    Bergman, Keren

    leaveadeepimprintonourworld.Theydesignandbuild sky-scrapers and long bridges, create new smart materials, manage large Bridge. Later founding the firm Steinman Engi- neers, he designs many landmark bridges throughout the U, con- sult on the Brooklyn Bridge, and lead the American Society of Civil Engineers (ASCE). 1892

  6. Identification of Signatures of Selection in Bos Taurus Beef and Dairy Cattle Using Genome-wide SNP Genotypes

    E-Print Network [OSTI]

    Choi, Jung Woo

    2010-10-12

    perspective on genetics and encouraging me to survive in the Kleberg Center. Deep appreciation goes to Dr. C. Michael Dickens for great computational assistance and for taking my hand once when I was lost and alone, as a true friend would. My appreciation... Frequency ............................................... 15 4.3 Population-Average FST ....................................................................... 21 4.4 Population-Specific FST...

  7. Database Publication Practices Philip A. Bernstein, Microsoft Research Holger Meyer, Univ. Rostock

    E-Print Network [OSTI]

    Snodgrass, Richard T.

    Database Publication Practices Philip A. Bernstein, Microsoft Research Holger Meyer, Univ. Rostock David DeWitt, Univ. Wisconsin M. Tamer zsu, Univ. Waterloo Andreas Heuer, Univ. Rostock Richard T will be encouraged to do the same. The panelists are Phil Bernstein (chair), Surajit Chaudhuri, David DeWitt, Zach

  8. Rfrences Bibliographiques [Abrossimov 89

    E-Print Network [OSTI]

    Donsez, Didier

    . [Bernstein 81] Philip A. Bernstein, Nathan Goodman, " Concurrency Control in Distributed Database Systems prives sur MASIX. [Carey 93] Michael J. Carey, David J. DeWitt, Jeffrey F. Naughton, "The OO7 Benchmark", SIGMOD'93. [Carey 94] Micheal J. Carey, D.J. DeWitt, Michael J. Franklin, et al, "Shoring Up Persistent

  9. Bryan - 25

    E-Print Network [OSTI]

    Unknown

    2006-01-01

    A META-ANALYSIS OF MERCURY LEVELS IN LAVACA BAY TEXAS A Thesis by MARIA C. PILLADO Submitted to the Office of Graduate and Professional Studies of Texas A&M University and the Graduate Faculty of The Texas A&M University Corpus... Subject: Marine Biology Copyright 2014 Maria C. Pillado ...

  10. Klement AS | Open Energy Information

    Open Energy Info (EERE)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home Page on QA:QAsource History View NewTexas: Energy ResourcesOrderInformationKizildere I Geothermal PwerKleberg

  11. ENERGY UTILIZATION AND ENVIRONMENTAL CONTROL TECHNOLOGIES IN THE COAL-ELECTRIC CYCLE

    E-Print Network [OSTI]

    Ferrell, G.C.

    2010-01-01

    Systems for Utility Boilers," T. W. Dewitt, et. ~. , JAPCA,Emi ssi ons from Ut il ity Boilers, II Report No. EPA-650/2-Possibilities: Power Plant Boiler and Cooling Systems,1I

  12. Rethinking the Conference Reviewing Process Moderators: Michael J. Franklin (UC Berkeley) and Jennifer Widom (Stanford)

    E-Print Network [OSTI]

    Ailamaki, Anastassia

    ) and Jennifer Widom (Stanford) Panelists: Anastassia Ailamaki (Carnegie Mellon), Philip A. Bernstein (Microsoft), David DeWitt (Wisconsin), Alon Halevy (Washington), Zachary Ives (U Penn), and Gerhard Weikum (Max

  13. Building Community Wikipedias: A Machine-Human Partnership Approach

    E-Print Network [OSTI]

    Doan, AnHai

    1 , Byron J. Gao 1 , Warren Shen 1 AnHai Doan 1 , Philip Bohannon 2 , Xiaojin Zhu 1 1 University = "David J. DeWitt", and title = "Professor".

  14. We would like to thank all those listed below for taking the time to review for Heredity in 2014 -your generosity is much appreciated and we hope your association with the journal continues in the future.

    E-Print Network [OSTI]

    Cai, Long

    , Meester De, Mestral De, Mita De, Wit Debes, Paul Delsuc, Frederic Demeure, Olivier Devillard, Sebastien DeWitt Hauffe, Heidi Hedrick, Philip Heffner, Elliot Hekkala, Evon Helantera, Heikki Herman, Jeremy Heron

  15. The Effect of Orbital Forcing on the Mean Climate and Variability of the Tropical Pacific

    E-Print Network [OSTI]

    Xie, Shang-Ping

    annual cycle (Timmermann et al. 2004a) and ENSO (Timmermann et al. 1999; Timmermann 2001; Philip and van- culation models (DeWitt and Schneider 1998, 2000; Codron 2001; Otto-Bliesner 1999; Liu et al. 2000; Otto

  16. 2015 Mathematics & Actuarial Science Distinguished Alumni ...

    E-Print Network [OSTI]

    $author.value

    CEO/president and co-founder of multiple start-ups in the oil and gas and the technology sectors, Paula deWitte has a distinguished and multi-faceted career as...

  17. Patterns in Functional Structure and Diversity of Stream Fish Assemblages Related to Environmental Factors at Multiple Scales

    E-Print Network [OSTI]

    Pease, Allison Ann

    2011-02-22

    Members, Gil G. Rosenthal Mariana Mateos Thomas J. DeWitt Head of Department, Thomas E. Lacher December 2010 Major Subject: Wildlife and Fisheries Sciences iii ABSTRACT Patterns in Functional Structure and Diversity of Stream Fish... of his indispensible insight, advice, patience, and encouragement throughout my time at Texas A&M. Drs. Gil Rosenthal, Mariana Mateos, and Thom DeWitt provided very valuable assistance along the way as members of my dissertation committee. I owe...

  18. An Analysis of Texas Waterways: A Report on the Physical Characteristics of Rivers, Streams, and Bayous in Texas.

    E-Print Network [OSTI]

    Belisle, Harold J.; Josselet, Ron

    1977-01-01

    Cree k San Jacinto River, East Fork Spring Creek Taylor Bayou Turkey Creek V. CENTRAL TEXAS WATE RWAYS A. Major Waterways Blanco River Bosque River Brazos River Colorado River Concho River . Frio River Guadalupe River Lampasas River... MAJOR CENTRAL TEXAS WATERWAYS 13. Blanco River 14. Bosque River 15. Brazos River 16. Colorado River 17. Concho River 18. Frio River 19. Guadal upe River 20. Lampasas River 21. Lavaca River 22. Leon River 23. Little River 24. Llano River 25...

  19. Characteristics of roosts of the Rio Grande turkey (Meleagris gallopavo intermedia) in South Texas

    E-Print Network [OSTI]

    Haucke, Harry Hayden

    1974-01-01

    : William H. Kiel, Jr. 1 th' ' t'g t'oo 32 ' t* t k y (M~1 ~3) ' t d' ) t 1o t d o th S t Gertrudis study area in Kleberg County and 11 were located on the Encino area in Brooks County. Nine win- ter roosts were evaluated on Santa Gertrudis and six... roosts when both were relatively numerous and of the same approximate heights. Winter roost density averaged 6, 359 acres per roost on the Santa Gertrudis area. Average distance between nearest-neighbor winter roosts was 1. 3 miles. Counts conducted...

  20. Social organization and behavior of aoudad (Ammotragus lervia) in Texas

    E-Print Network [OSTI]

    Solbert, Alan Goodrich Kirk

    1983-01-01

    for their encouragement during the last few years and P. Fenn for her unflagging diligence in typing this manuscript. I also want to thank Dr. J. Teer for help in securing funding for this study. I am grateful to the Caesar Kleberg Research Program in Wildlife..., but their present status is unknown (Happold 1967). It may be that the last aoudad strongholds are in the uninhabited regions of the Atlas Mountains (Schomber and Kock 1959-60, Edmond-Blanc 1954), the Ennedi Mountains, and parts of Libya and northern Sudan...

  1. Klickitat County, Washington: Energy Resources | Open Energy Information

    Open Energy Info (EERE)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home Page on QA:QAsource History View NewTexas: Energy ResourcesOrderInformationKizildere I Geothermal PwerKlebergKlickitat

  2. Impacts of Recreational and Commercial Fishing and Coastal Resource-Based Tourism on Regional and State Economies

    E-Print Network [OSTI]

    Jones, Lonnie L.; Tanyeri-Abur, Aysen

    2001-01-01

    wage and employment in the six estuary systems along the Texas Gulf Coast, 1993-1995 average Estuary Population Wage Employment (persons) ($mils) (jobs) Sabine Neches 374,636 3,201 119,831 Trinity-San Jacinto 3,904,277 46,24 1... 2001 Report Table 1.2 Travel expenditures and employment in the six estuaries, 1995. Estuary Expenditures Employment ($mils) (jobs) Sabine Neches 209 3,240 Trinity-San Jacinto 4,861 88,240 Lavaca-Tres Palacios 101 1...

  3. Variations in disaster aid acquisitions among ethnic groups in a rural community

    E-Print Network [OSTI]

    Galindo, Kim Blanca

    2009-06-02

    was proportionally hit the hardest of all towns in this flood, the devastation did not stop there. The Presidential disaster declaration originally covered twenty counties in central Texas, including DeWitt County, where Switchback is located, and brought................................................ 5 II THE SETTING ......................................................................... 8 Flood history of the Guadalupe River in Central Texas ... 8 The 1998 flood............................................................... 10 III...

  4. College of Science & Engineering Dr. Sheldon Axler, Dean

    E-Print Network [OSTI]

    College of Science & Engineering Dr. Sheldon Axler, Dean Dr. Lisa White, Associate Dean Dr. Michael Goldman, Chair, Department of Biology Dr. Jane DeWitt, Chair, Department of Chemistry & Biochemistry Dr. Dragutin Petkovic, Chair, Department of Computer Science Dr. Wenshen Pong, Director, School of Engineering

  5. Central Michigan Theresa Abed (2008), Grand Ledge

    E-Print Network [OSTI]

    Riley, Shawn J.

    2008-01-01

    (1999), East Lansing John Daly III (1999), Flushing Thomas Darger (1995), Midland Brian Davis (2014 Arbor Andrew Doerr (2005), Lansing Ryan Earl (2011), Lansing Brian Elder (2009), Bay City Darren Elliott (Fall 1993), Dewitt Katheryn Elliott (2006), St. Johns Andrew Everman (2006), Flushing Michael Ezzo

  6. Remarks on low-energy approximations for Feynman path integration on the sphere

    E-Print Network [OSTI]

    Yoshihisa Miyanishi

    2015-01-15

    We shall define the oscillatory integrals by action integrals, Van Vleck determinant and Dewitt curvature. Our method employs action integrals along the shortest paths. We have the strong but not uniform convergence of time slicing Feynman path integrals for low energy functions.

  7. PHENOTYPIC PLASTICITY Functional and Conceptual Approaches

    E-Print Network [OSTI]

    DeWitt, Thomas J.

    PHENOTYPIC PLASTICITY Functional and Conceptual Approaches Edited by Thomas J. DeWitt Samuel M. A great breadth of ideas fall under the rubric of phenotypic plasticity, and this book is designed these diverse ideas under an intentionally broad definition of plasticity: environment-dependent phenotype

  8. Annu. Rev. Plant Biol. 2003. 54:23564 doi: 10.1146/annurev.arplant.54.031902.134836

    E-Print Network [OSTI]

    Murray, J.A.H.

    Annu. Rev. Plant Biol. 2003. 54:23564 doi: 10.1146/annurev.arplant.54.031902.134836 Copyright c, 2003 THE PLANT CELL CYCLE Walter Dewitte and James A.H. Murray Institute of Biotechnology, University in plants is controlled by the activity of cyclin-dependent kinase (CDK) complexes. Although this basic

  9. Seminars in Cell & Developmental Biology 16 (2005) 385396 The developmental context of cell-cycle control in plants

    E-Print Network [OSTI]

    Murray, J.A.H.

    2005-01-01

    -cycle control in plants Sarah M. de Jager, Spencer Maughan, Walter Dewitte, Simon Scofield, James A.H. Murray online 2 March 2005 Abstract Plant growth is characterised both by continued growth and organogenesis of cell cycle regulators in plants, creating a challenge to understand how these genes control plant

  10. York University Contracts -Fiscal Year 2006-2007 Researcher Project Title Funder Total Funding Start Date End Date

    E-Print Network [OSTI]

    Harbour Environment Canada $16,000 7/12/2006 7/12/2007 Benchimol, Samuel Antisense Oligonucleotides Infrastructure Canada $174,363 5/30/2006 5/30/2007 Dewitt , David B CANCAPS Conference - December 1-3, 2006 Asia) Canadian Space Agency $787,513 5/1/2006 5/1/2007 Frolic, Bernie China Training Program - Third Henan Higher

  11. CRUISE REPORT Cruise Number: DY-10-03

    E-Print Network [OSTI]

    Sand Point Way N.E., Seattle, Washington 98115-6439 NOAA - Alaska Fisheries Science Center (AFSC) 7600 Sand Point Way N.E. Seattle, Washington 98115-0070 Chief Scientist: Carol DeWitt, NOAA/PMEL Personnel, temperature and depth (CTD) profiler casts. To complete bongo and CalVET tows. Summary of Operations: CTD

  12. CRUISE REPORT Cruise Number: DY-09-06

    E-Print Network [OSTI]

    (PMEL) 7600 Sand Point Way N.E., Seattle, Washington 98115-6439 NOAA - Alaska Fisheries Science Center (AFSC) 7600 Sand Point Way N.E. Seattle, Washington 98115-0070 Chief Scientist: Carol DeWitt, NOAA) profiler casts. To complete bongo and CalVET tows. Summary of Operations: CTD casts 34 Mooring deployments

  13. Evolution of the Design of a Second Generation FireWire Based Data Acquisition System

    E-Print Network [OSTI]

    Hauck, Scott

    , Fellow, IEEE, R.S. Miyaoka, Senior Member, IEEE, L.R. MacDonald, Member, IEEE, M. Haselman, D. DeWitt, S timing channel. We have also considered devices such as the new Philips digital SiPM arrays which use

  14. [1] http://web.media.mit.edu/ push/omcs-research.html. [2] http://www.openmind.org/lectureslides.html.

    E-Print Network [OSTI]

    Doan, AnHai

    ://www.openmind.org/lectureslides.html. [3] Serge Abiteboul, Rakesh Agrawal, Philip A. Bernstein, Mikie Carey, Stefano Ceri, Bruce Croft, David J. DeWitt, Michael J. Franklin, Hector Garcia-Molina, Dieter Gawlick, Jim Gray, Laura Haas, Alon-to-peer computing: A vision. In Workshop on the Web and Databases, WebDB, 2002. [15] Philip Bernstein, Umeshwar

  15. UNIVERSITY OF CALIFORNIA, BERKELEY, CALIFORNIA 94720 for Numbers 1 to 50

    E-Print Network [OSTI]

    California at Berkeley, University of

    Prueba ... (Esparza) 49:2 Alexander, DeWitt, 31:2; 39:4 Alexander, Eveline M., diary, 11:5-6 Alexander of) 18:4-5 Bancroft, Lucy Howe, 8:3 Bancroft, Philip, 8:3; 17:4 Bancroft Company, The, building

  16. CX-010444: Categorical Exclusion Determination

    Broader source: Energy.gov [DOE]

    Technology Integration Program - Field Trial Site Two - Eagle Ford Shale, DeWitt County, Texas CX(s) Applied: A9, B3.1, B3.6 Date: 06/19/2013 Location(s): Multiple Offices(s): National Energy Technology Laboratory

  17. Epicurean Primitivism: An Analysis of Lucretius On the Nature of Things Book 5

    E-Print Network [OSTI]

    Waggle, Larry J.

    -113. DeWitt, Norman. Epicurus and His Philosophy. Reprinted by Greenwood Press Publishers. Westport: Conneticut. 1973. Originally published in 1954 by University of Minnesota Press. Denyer, Nicholas. "The Origin of Justice", Syzetesis. p. 133...Epicurean Primitivism: An Analysis of Lucretius On the Nature of Things Book 5 Larry J Waggle Illinois State University In the Greek tradition of political thought, one alleged political theory stands apart from the rest, namely the one...

  18. Notes on Feynman path integral-like methods of quantization on Riemannian manifolds

    E-Print Network [OSTI]

    Yoshihisa Miyanishi

    2015-12-20

    We propose an alternative method for Feynman path integrals on compact Riemannian manifolds. Our method employs action integrals along the shortest paths. In the case of rank 1 locally symmetric Riemannian manifolds, we prove the strong convergence of time slicing products of oscillatory integrals for low energy functions. Moreover, the strong limit includes Dewitt curvature $R/6$, where $R$ denotes the scalar curvature of a Riemannian manifold.

  19. Individual variation in cooperative behaviour in meerkats

    E-Print Network [OSTI]

    English, Sinad

    2010-04-13

    foraging behaviour and vocalizations 92 7.1 Abstract 93 7.2 Introduction 93 7.3 Methods 97 7.3.1 Do adults modify their foraging behaviour in the presence of pups? 97 7.3.2 Do adults modify their vocalizations in the presence of pups? 99 7.3.3 What... depending on the environment (Luttbeg and Warner, 1999). There is increasing evidence, however, that behaviour may be constrained within individuals (Pigliucci, 2001), just as there are limits on other aspects of phenotypic plasticity (DeWitt et al., 1998...

  20. Pond Scum

    E-Print Network [OSTI]

    Crawford, Amanda

    2005-01-01

    stream_source_info Pond Scum.pdf.txt stream_content_type text/plain stream_size 2559 Content-Encoding ISO-8859-1 stream_name Pond Scum.pdf.txt Content-Type text/plain; charset=ISO-8859-1 tx H2O | pg. 7 Eight years ago..., 10 ponds were built on theTexas A&M University Riverside Campus. But the agricultural program for which these ponds were intended moved away from that campus and the ponds were neither used nor maintained. Thomas DeWitt, assistant professor...

  1. Comparison of test specific sediment effect concentrations with marine sediment quality assessment guidelines

    SciTech Connect (OSTI)

    Carr, R.S.; Biedenbach, J.M. [National Biological Service, Corpus Christi, TX (United States). Marine Ecotoxicology Research Station; Long, E.R. [NOAA, Seattle, WA (United States); MacDonald, D.D. [MacDonald Environmental Sciences Ltd., Ladysmith, British Columbia (Canada)

    1995-12-31

    As part of NOAA`s National Status and Trends (NS and T) Bioeffects Assessment program and studies conducted by the National Biological Service, numerous sediment quality assessment surveys have recently been conducted along the Atlantic and Gulf coasts of the US using the sea urchin (Arbacia punctulata) fertilization and embryological development tests with pore water. Additional toxicity tests were also conducted in conjunction with most of these studies. The areas that have been sampled include Boston harbor, Massachusetts; Charleston Harbor, Winyah Bay, and Savannah River, South Carolina; St. Simon Sound, Georgia; Biscayne Bay, Tampa Bay, Choctawhatchee Bay, Apalachicola Bay, St. Andrew Bay, and Pensacola Bay, Florida; Galveston Bay, Lavaca Bay, and Sabine Lake, Texas, and 200 stations in the vicinity of offshore oil and gas production platforms in the Gulf of Mexico. Sufficient data are now available from this series of surveys to calculate test specific sediment effect concentrations (SECs). Based on these recent studies, SECs were developed for the sea urchin porewater and amphipod tests and compared with existing marine sediment quality assessment guidelines.

  2. A parametrix for quantum gravity?

    E-Print Network [OSTI]

    Esposito, Giampiero

    2015-01-01

    In the sixties, DeWitt discovered that the advanced and retarded Green functions of the wave operator on metric perturbations in the de Donder gauge make it possible to define classical Poisson brackets on the space of functionals that are invariant under the action of the full diffeomorphism group of spacetime. He therefore tried to exploit this property to define invariant commutators for the quantized gravitational field, but the operator counterpart of such classical Poisson brackets turned out to be a hard task. On the other hand, the mathematical literature studies often an approximate inverse, the parametrix, which is, strictly, a distribution. We here suggest that such a construction might be exploited in canonical quantum gravity. We begin with the simplest case, i.e. fundamental solution and parametrix for the linear, scalar wave operator; the next step are tensor wave equations, again for linear theory, e.g. Maxwell theory in curved spacetime. Last, the nonlinear Einstein equations are studied, rel...

  3. Quantum geometrodynamics creates new problems

    E-Print Network [OSTI]

    T. P. Shestakova

    2008-10-22

    The development of last years in quantum geometrodynamics highlights new problems which were not obvious in its first formulation proposed by Wheeler and DeWitt. At the first stage the main task was to apply known quantization schemes to gravitational field or a certain cosmological model. This way has led to the realization of the fact that a quantum description of the Universe is impossible without implicit or explicit indication to a reference frame presented by some medium, filling the whole Universe, with its own equation of state and thermodynamical properties. Thus the questions arise, should one seek for a "privileged" reference frame or consider all the variety of gauge conditions and appropriate solutions for the wave function? It is worth noting that thermodynamical properties of such a quantum Universe would also depend on a chosen reference frame to some extent. So, we need a self-consistent quantum theoretical and thermodynamical description of the Universe.

  4. Quantum cosmological solutions: their dependence on the choice of gauge conditions and physical interpretation

    E-Print Network [OSTI]

    T. P. Shestakova

    2008-01-30

    In "extended phase space" approach to quantum geometrodynamics numerical solutions to Schrodinger equation corresponding to various choice of gauge conditions are obtained for the simplest isotropic model. The "extended phase space" approach belongs to those appeared in the last decade in which, as a result of fixing a reference frame, the Wheeler - DeWitt static picture of the world is replaced by evolutionary quantum geometrodynamics. Some aspects of this approach were discussed at two previous PIRT meetings. We are interested in the part of the wave function depending on physical degrees of freedom. Three gauge conditions having a clear physical meaning are considered. They are the conformal time gauge, the gauge producing the appearance of Lambda-term in the Einstein equations, and the one covering the two previous cases as asymptotic limits. The interpretation and discussion of the obtained solutions is given.

  5. Grounds for Quantum Geometrodynamics in an extended phase space and its cosmological consequences

    E-Print Network [OSTI]

    T. P. Shestakova

    2000-06-29

    Quantum geometrodynamics (QGD) in extended phase space essentially distinguished from the Wheeler - DeWitt QGD is proposed. The grounds for constructing a new version of quantum geometrodynamics are briefly discussed. The main part in the proposed version of QGD is given to the Schrodinger equation for a wave function of the Universe. The Schrodinger equation carries information about a chosen gauge condition which fixes a reference system. The reference system is represented by a continual medium that can be called ``the gravitational vacuum condencate". A solution to the Schrodinger equation contains information about the integrated system ``a physical object + observation means (the gravitational vacuum condensate)". It may be demonstrated that the gravitational vacuum condensate appears to be a cosmological evolution factor.

  6. The Salmonella type III secretion system virulence effector forms a new hexameric chaperone assembly for export of effector/chaperone complexes

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

    Tsai, Chi -Lin; Burkinshaw, Brianne J.; Strynadka, Natalie C. J.; Tainer, John A.; Stock, A. M.

    2014-12-08

    Bacteria hijack eukaryotic cells by injecting virulence effectors into host cytosol with a type III secretion system (T3SS). Effectors are targeted with their cognate chaperones to hexameric T3SS ATPase at the bacterial membrane's cytosolic face. In this issue of the Journal of Bacteriology, Roblin et al. (P. Roblin, F. Dewitte, V. Villeret, E. G. Biondi, and C. Bompard, J Bacteriol 197:688698, 2015, http://dx.doi.org/10.1128/JB.02294-14) show that the T3SS chaperone SigE of Salmonella can form hexameric rings rather than dimers when bound to its cognate effector, SopB, implying a novel multimeric association for chaperone/effector complexes with their ATPase.

  7. Notes On The Klein-Gordon Equation

    E-Print Network [OSTI]

    Fredrick Michael

    2010-04-09

    In this article, we derive the scalar parametrized Klein-Gordon equation from the formal information theory framework. The least biased probability distribution is obtained, and the scalar equation is recast in terms of a Fokker-Planck equation in terms of the imaginary time, or a Schroedinger equation for the proper time. This method yields the Green's function parametrized by an evolution parameter. The derivation can then allow the use of potentials as constraints along with the Hamiltonian or moments of the evolution. The information theoretic, analogously the maximum entropy method, also allows one to examine the possibility of utilizing generalized and non-extensive statistics in the derivation. This approach yields non-linear evolution in the parametrized Klein-Gordon partial differential equations. Furthermore, we examine the Klein-Gordon equation in curved space-time, and we compare our results to the results of Schwinger and Dewitt obtained from path integral approaches.

  8. The Salmonella type III secretion system virulence effector forms a new hexameric chaperone assembly for export of effector/chaperone complexes

    SciTech Connect (OSTI)

    Tsai, Chi -Lin [Lawrence Berkeley National Laboratory, Berkeley, CA (United States), Life Sciences Division.] (ORCID:0000000203652405); Burkinshaw, Brianne J. [University of British Columbia, Vancouver, British Columbia (Canada); Strynadka, Natalie C. J. [University of British Columbia, Vancouver, British Columbia (Canada); Tainer, John A. [Lawrence Berkeley National Laboratory, Berkeley, CA (United States), Life Sciences Division.; Stock, A. M. [Editor

    2014-12-08

    Bacteria hijack eukaryotic cells by injecting virulence effectors into host cytosol with a type III secretion system (T3SS). Effectors are targeted with their cognate chaperones to hexameric T3SS ATPase at the bacterial membrane's cytosolic face. In this issue of the Journal of Bacteriology, Roblin et al. (P. Roblin, F. Dewitte, V. Villeret, E. G. Biondi, and C. Bompard, J Bacteriol 197:688698, 2015, http://dx.doi.org/10.1128/JB.02294-14) show that the T3SS chaperone SigE of Salmonella can form hexameric rings rather than dimers when bound to its cognate effector, SopB, implying a novel multimeric association for chaperone/effector complexes with their ATPase.

  9. A view on the problems of Quantum Gravity

    E-Print Network [OSTI]

    T. P. Shestakova

    2011-11-09

    The existing approaches to quantization of gravity aim at giving quantum description of 3-geometry following to the ideas of the Wheeler -- DeWitt geometrodynamics. In this description the role of gauge gravitational degrees of freedom is missed. A probable alternative is to consider gravitational dynamics in extended phase space, taking into account the distinctions between General Relativity and other field theories. The formulation in extended phase space leads to some consequences at classical and quantum levels. At the classical level, it ensures that Hamiltonian dynamics is fully equivalent to Lagrangian dynamics, and the algebra of Poisson brackets is invariant under reparametrizations in a wide enough class including reparametrizations of gauge variables, meantime in the canonical Dirac approach the constraints' algebra is not invariant that creates problems with quantization. At the quantum level, the approach come to the description in which the observer can see various but complementary quantum gravitational phenomena in different reference frames that answers the spirit of General Relativity and Quantum Theory. Though until now the approach was applied to General Relativity in its original formulations, its implementation in different trends, including Quantum Loop Gravity or some other representations of gravitational variables, would also be of interest.

  10. Cosmological solutions for the Universe filled with matter in various states and gauge invariance

    E-Print Network [OSTI]

    T. P. Shestakova

    2006-05-11

    We explore at phenomenological level a model of the Universe filled with various kinds of matter characterized by different equations of state. We show that introducing of each kind of matter is equivalent to a certain choice of a gauge condition, the gauge condition describing a medium with a given equation of state. The case of a particular interest is when one kind of matter (de Sitter false vacuum) dominates at the early stage of the Universe evolution while another kind (radiation, or ultrarelativistic gas) dominates at its later stage. We can, therefore, consider different asymptotic regimes for the early and later stages of the Universe existence. These regimes are described by solutions to the Wheeler - DeWitt equation for the Universe with matter in that given state, and, at the same time, in the "extended phase space" approach to quantum geometrodynamics the regimes are described by solutions to a Schrodinger equation associated with a choice of some gauge condition. It is supposed that, from the viewpoint of the observer located at the later stage of the Universe evolution, solutions for a Lambda-dominated early Universe would decay.

  11. The formulation of General Relativity in extended phase space as a way to its quantization

    E-Print Network [OSTI]

    T. P. Shestakova

    2009-11-30

    Our attempts to find an explanation for quantum behavior of the Early Universe appeal, as a rule, to the Wheeler - DeWitt Quantum Geometrodynamics which relies upon Hamiltonian formulation of General Relativity proposed by Arnowitt, Deser and Misner (ADM). In spite of the fact that the basic ideas of this approach were put forward about fifty years ago, even now we do not have clear understanding what Hamiltonian formulation of General Relativity must be. An evidence for it gives a recent paper by Kiriushcheva and Kuzmin [arXiv:0809.0097], where the authors claim that the formulation by ADM and that by Dirac made in his seminal work of 1958 are not equivalent. If so, we face the question what formalism should be chosen. Another problem is that we need a well-grounded procedure of constructing a generator of transformations in phase space for all gravitational variables including gauge ones. It suggests the notion of extended phase space. After analyzing the situation, we show that Hamiltonian formulation in extended phase space is a real alternative to Dirac and ADM formulations and can be constructed to be equivalent to the original (Lagrangian) formulation of General Relativity. Quantization in extended phase space is straightforward and leads to a new description of quantum Universe in which an essential place is given to gauge degrees of freedom.

  12. Hamiltonian formulation of General Relativity 50 years after the Dirac celebrated paper: do unsolved problems still exist?

    E-Print Network [OSTI]

    T. P. Shestakova

    2010-01-25

    About 50 years ago, in 1958, Dirac published his formulation of generalized Hamiltonian dynamics for gravitation. Several years later Arnowitt, Deser and Misner (ADM) proposed their description of the dynamics of General Relativity which became a basis of the Wheeler - DeWitt Quantum Geometrodynamics. There exist also other works where the Hamiltonian formulation of gravitational theory was discussed. In spite of decades passed from the famous papers by Dirac and ADM, there are unsolved problems. Namely, are the Dirac and ADM formulations equivalent to each other? Are these formulations equivalent to the original (Lagrangian) Einstein theory? Is the group of transformation in phase space the same as the group of gauge transformation of the Einstein theory? What are rules according to which a generator of transformations in phase space should be constructed? Let us mention also another approach based on extended phase space where gauge degrees of freedom are treated on the equal ground with physical degrees of freedom. Our purpose is to review the above questions and to demonstrate advantages of the extended phase space approach by the example of a simple model with finite number degrees of freedom.

  13. The "extended phase space" approach to quantum geometrodynamics: what can it give for the development of quantum gravity?

    E-Print Network [OSTI]

    T. P. Shestakova

    2008-10-22

    The talk is devoted to the "extended phase space" approach to Quantum Geometrodynamics. The premises that have led to the formulation of this approach are briefly reviewed, namely, non-trivial topology of the Universe which implies the absence of asymptotic states, in contrast to situations one usually deals in ordinary quantum field theory; parametrization noninvariance in the Wheeler - DeWitt theory; the problem of time and the absence of dynamical evolution. Then we discuss the main features of the approach: Hamiltonian dynamics in extended phase space, gauge-dependent Schrodinger equation for the wave function of the Universe, the description of quantum Universe from the viewpoint of observers in a wide enough class of reference frames. After all, we analyse problems arising in this approach: the structure of Hilbert space in Quantum Geometrodynamics, the relations between solutions for the wave function of the Universe corresponding to various reference frames, properties of a medium to be necessary to fix a reference frame, the transition to classical limit.

  14. Combining NASA/JPL One-Way Optical-Fiber Light-Speed Data with Spacecraft Earth-Flyby Doppler-Shift Data to Characterise 3-Space Flow

    E-Print Network [OSTI]

    Reginald T Cahill

    2009-07-22

    We combine data from two high precision NASA/JPL experiments: (i) the one-way speed of light experiment using optical fibers: Krisher T.P., Maleki L., Lutes G.F., Primas L.E., Logan R.T., Anderson J.D. and Will C.M., Phys. Rev. D, vol 42, 731-734, 1990, and (ii) the spacecraft earth-flyby doppler shift data: Anderson J.D., Campbell J.K., Ekelund J.E., Ellis J. and Jordan J.F., Phys. Rev. Lett., vol 100, 091102, 2008, to give the solar-system galactic 3-space average speed of 486km/s in the direction RA=4.29hrs, Dec=-75.0deg. Turbulence effects (gravitational waves) are also evident. Data also reveals the 30km/s orbital speed of the earth and the sun inflow component at 1AU of 42km/s and also 615km/s near the sun, and for the first time, experimental measurement of the 3-space 11.2km/s inflow of the earth. The NASA/JPL data is in remarkable agreement with that determined in other light speed anisotropy experiments, such as Michelson-Morley (1887), Miller (1933), Torr and Kolen (1981), DeWitte (1991), Cahill (2006), Munera (2007), Cahill and Stokes (2008) and Cahill (2009).

  15. Review on the quantization of gravity

    E-Print Network [OSTI]

    Benjamin Schulz

    2014-09-29

    This is a review article on quantum gravity. In section 1, the Penrose singularity theorem is proven. In section 2, the covariant quantization approach of gravity is reviewed. In section 3, an article by Hawking is reviewed that shows the gravitational path integral at one loop level to be dominated by contributions from some kind of virtual gravitational instantons. In section 4, the canonical, non-perturbative quantization approach is reviewed. In section 5, arguments from Hawking are mentioned which show the gravitational path integral to be an approximate solution of the Wheeler deWitt equation. In section 6, the black hole entropy is derived in various ways. Section 6.1 uses the gravitational path integral for this calculation. Section 6.2 shows how the black hole entropy can be derived from canonical quantum gravity. In section 7.1, arguments from Dvali and Gomez who claim that gravity can be quantized in a way which would be in some sense self-complete are critically assessed. In section 7.2 a model from Dvali and Gomez for the description of quantum mechanical black holes is critically assessed and compared with the standard quantization methods of gravity.

  16. Environmental analysis of geopressured-geothermal prospect areas, De Witt and Colorado counties, Texas. Final report, March 1 - August 31, 1979

    SciTech Connect (OSTI)

    Gustavson, T.C.; Reeder, F.S.; Badger, E.A.

    1980-02-01

    Information collected and analyzed for a preliminary environmental analysis of geopressured geothermal prospect areas in Colorado and DeWitt Counties, Texas is presented. Specific environmental concerns for each geopressured geothermal prospect area are identified and discussed. Approximately 218 km/sup 2/(85 mi/sup 2/) were studied in the vicinity of each prospect area to: (1) conduct an environmental analysis to identify more and less suited areas for geopressured test wells; and (2) provide an environmental data base for future development of geopressured geothermal energy resources. A series of maps and tables are included to illustrate environmental characteristics including: geology, water resources, soils, current land use, vegetation, wildlife, and meteorological characteristics, and additional relevant information on cultural resources, power- and pipelines, and regulatory agencies. A series of transparent overlays at the scale of the original mapping has also been produced for the purposes of identifying and ranking areas of potential conflict between geopressured geothermal development and environmental characteristics. The methodology for ranking suitability of areas within the two prospect areas is discussed in the appendix. (MHR)

  17. The quantum realm of the "Little Sibling" of the Big Rip singularity

    E-Print Network [OSTI]

    Imanol Albarran; Mariam Bouhmadi-Lpez; Francisco Cabral; Prado Martn-Moruno

    2015-09-24

    We analyse the quantum behaviour of the "Little Sibling" of the Big Rip singularity (LSBR) [1]. The quantisation is carried within the geometrodynamical approach given by the Wheeler--DeWitt (WDW) equation. The classical model is based on a Friedmann--Lema\\^{i}tre--Robertson--Walker Universe filled by a perfect fluid that can be mapped to a scalar field with phantom character. We analyse the WDW equation in two setups. In the first step, we consider the scale factor as the single degree of freedom, which from a classical perspective parametrises both the geometry and the matter content given by the perfect fluid. We then solve the WDW equation within a WKB approximation, for two factor ordering choices. On the second approach, we consider the WDW equation with two degrees of freedom: the scale factor and a scalar field. We solve the WDW equation, with the Laplace--Beltrami factor-ordering, using a Born--Oppenheimer approximation. In both approaches, we impose the DeWitt (DW) condition as a potential criterion for singularity avoidance. We conclude that in all the cases analysed the DW condition can be verified, which might be an indication that the LSBR can be avoided or smoothed in the quantum approach.

  18. The quantum realm of the "Little Sibling" of the Big Rip singularity

    E-Print Network [OSTI]

    Albarran, Imanol; Cabral, Francisco; Martn-Moruno, Prado

    2015-01-01

    We analyse the quantum behaviour of the "Little Sibling" of the Big Rip singularity (LSBR) [1]. The quantisation is carried within the geometrodynamical approach given by the Wheeler--DeWitt (WDW) equation. The classical model is based on a Friedmann--Lema\\^{i}tre--Robertson--Walker Universe filled by a perfect fluid that can be mapped to a scalar field with phantom character. We analyse the WDW equation in two setups. In the first step, we consider the scale factor as the single degree of freedom, which from a classical perspective parametrises both the geometry and the matter content given by the perfect fluid. We then solve the WDW equation within a WKB approximation, for two factor ordering choices. On the second approach, we consider the WDW equation with two degrees of freedom: the scale factor and a scalar field. We solve the WDW equation, with the Laplace--Beltrami factor-ordering, using a Born--Oppenheimer approximation. In both approaches, we impose the DeWitt (DW) condition as a potential criterion...

  19. Department of Energy fiscal years 1981 to 1982 authorization (civilian applications). Hearings before the Subcommittee on Energy Research and Development of the Committee on Energy and Natural Resources, United States Senate, Ninety-Sixth Congress, Second Session

    SciTech Connect (OSTI)

    Not Available

    1980-01-01

    The March 17 hearing examined the budget requests for the DOE fossil-energy and environmental programs and included statements by George Fumich, Jr. Assistant Secretary for Fossil Energy and Ruth Clusen, Secretary. for Environment. the March 20 hearing examined the Office of Conservation and Solar Programs with statements, by Dr. Bennett Miller, Deputy Assistant Secretary for Solar Energy (designate) and Dr. Maxine Savitz, Deputy Assistant Secretary for Conservation. On March 24, the hearings ranged over a broad set of topics in the R and D area, with statements by Dr. Ruth M. Davis, Assistant Secretary, Resource Applications, plus several from her staff; by Dr. Nelson D. Dewitt, Deputy Director, Office of Energy Research, assisted by several OER colleagues; and by Duane C. Sewell, Assistant Secretary of Defense Programs, accompanied by Richard Schriever, Deputy Director, Office of Inertial Fusion, and Eugene Beckett, Waste Isolation Project leader. The April 1 hearing was devoted to testimony from nongovernmental officials expressing their views on the DOE budget for FY 1981. On April 21, programs under the Assistant Secretary for Nuclear Energy were examined. Sen. Church (Idaho), presiding, expressed grave concern over the trend in the DOE nuclear energy programs for the past 3 years, fearing we are on the verge of losing many important future energy options; he opined that the subcommittee members would try to comprehend the rationale that DOE offers in support of the major curtailments on practically all fronts of nuclear energy The testimony was by George W. Cunningham, Assistant Secretary for Nuclear Energy, who submitted a lengthy, detailed formal statement for the record.