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Sample records for davis besse-2 reactor

  1. Technical evaluation of the noise and isolation testing of the reactor protection system for the Davis Besse Nuclear Power Station, Unit 1

    SciTech Connect

    Selan, J.C.

    1980-01-01

    This report documents the technical evaluation of the noise and isolation testing of the reactor protection system (RPS) for the Davis Besse Nuclear Power Station, Unit 1. The testing was performed in accordance to Section 4.6.11, Susceptibility, of MIL-N-19900B, and NRC approved plant test methods. Analysis of the test results shows that the reactor protection system did not degrade below acceptable levels when subjected to electromagnetic, electrostatic, isolation and noise level tests, nor was the system's ability to perform its Class 1E protective functions affected.

  2. Davis combs her hair

    NASA Image and Video Library

    1997-08-28

    STS085-327-011 (7 - 19 August 1997) --- Astronaut N. Jan Davis spends a moment of her off-duty time aboard the Space Shuttle Discovery brushing her hair. Davis, payload commander, never strayed far from the payload operations checklist, seen attached to nearby mid-deck wall.

  3. Bolden Visit Davis Elementary

    NASA Image and Video Library

    2009-09-10

    NASA Administrator Charles F. Bolden speaks to students during a visit to Davis Elementary School, Friday, Sept. 11, 2009, in Washington. Bolden spent time with approximately 120 students in third, fourth and fifth grade talking about science, technology, mathematics and engineering as part of the National Day of Service and Remembrance. Photo Credit: (NASA/Paul E. Alers)

  4. Bolden Visit Davis Elementary

    NASA Image and Video Library

    2009-09-10

    NASA Administrator Charles F. Bolden reads a passage from the book "Can You Fly High Wright Brothers?" while visiting with students at Davis Elementary School, Friday, Sept. 11, 2009, in Washington. Bolden spent time with approximately 120 students in third, fourth and fifth grade talking about science, technology, mathematics and engineering as part of the National Day of Service and Remembrance. Photo Credit: (NASA/Paul E. Alers)

  5. Paul Davis Restoration Information Sheet

    EPA Pesticide Factsheets

    Paul Davis Restoration (the Company) is located in Nicholasville, Kentucky. The settlement involves renovation activities conducted at a property constructed prior to 1978, located in Lexington, Kentucky.

  6. 75 FR 76498 - Firstenergy Nuclear Operating Company, Davis-Besse Nuclear Power Station; Environmental...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2010-12-08

    ... COMMISSION Firstenergy Nuclear Operating Company, Davis-Besse Nuclear Power Station; Environmental Assessment... Company (FENOC, the licensee), for operation of the Davis-Besse Nuclear Power Station, Unit 1 (DBNPS... nuclear power reactors provide adequate margins of safety during any condition of normal...

  7. According to Davis: Connecting Principles and Practices

    ERIC Educational Resources Information Center

    Schulman, Steven M.

    2013-01-01

    In this article, the author allows Robert B. Davis to state for himself his own Principles concerning how children learn, and how teachers can best teach them. These principles are put forward in Davis' own words along with detailed documentation. The author goes on compare Davis' words with his practices. A single Davis video (Towers of Hanoi) is…

  8. According to Davis: Connecting Principles and Practices

    ERIC Educational Resources Information Center

    Schulman, Steven M.

    2013-01-01

    In this article, the author allows Robert B. Davis to state for himself his own Principles concerning how children learn, and how teachers can best teach them. These principles are put forward in Davis' own words along with detailed documentation. The author goes on compare Davis' words with his practices. A single Davis video (Towers of Hanoi) is…

  9. REACTOR

    DOEpatents

    Szilard, L.

    1963-09-10

    A breeder reactor is described, including a mass of fissionable material that is less than critical with respect to unmoderated neutrons and greater than critical with respect to neutrons of average energies substantially greater than thermal, a coolant selected from sodium or sodium--potassium alloys, a control liquid selected from lead or lead--bismuth alloys, and means for varying the quantity of control liquid in the reactor. (AEC)

  10. REACTOR

    DOEpatents

    Christy, R.F.

    1961-07-25

    A means is described for co-relating the essential physical requirements of a fission chain reaction in order that practical, compact, and easily controllable reactors can be built. These objects are obtained by employing a composition of fissionsble isotope and moderator in fluid form in which the amount of fissionsble isotcpe present governs the reaction. The size of the reactor is no longer a critical factor, the new criterion being the concentration of the fissionable isotope.

  11. Davis Reaches for the Sun.

    ERIC Educational Resources Information Center

    Steinhart, Peter

    1980-01-01

    Described is the community-wide approach to a unified energy conservation plan for Davis, California. The plan has involved solar technology and use of bicycles as a major mode of transportation. Policy implementation in the form of energy conservation ordinances is reviewed. (RE)

  12. REACTOR

    DOEpatents

    Roman, W.G.

    1961-06-27

    A pressurized water reactor in which automatic control is achieved by varying the average density of the liquid moderator-cooiant is patented. Density is controlled by the temperature and power level of the reactor ftself. This control can be effected by the use of either plate, pellet, or tubular fuel elements. The fuel elements are disposed between upper and lower coolant plenum chambers and are designed to permit unrestricted coolant flow. The control chamber has an inlet opening communicating with the lower coolant plenum chamber and a restricted vapor vent communicating with the upper coolant plenum chamber. Thus, a variation in temperature of the fuel elements will cause a variation in the average moderator density in the chamber which directly affects the power level of the reactor.

  13. REACTORS

    DOEpatents

    Spitzer, L. Jr.

    1961-10-01

    Thermonuclear reactors, methods, and apparatus are described for controlling and confining high temperature plasma. Main axial confining coils in combination with helical windings provide a rotational transform that avoids the necessity of a figure-eight shaped reactor tube. The helical windings provide a multipolar helical magnetic field transverse to the axis of the main axial confining coils so as to improve the effectiveness of the confining field by counteracting the tendency of the more central lines of force in the stellarator tube to exchange positions with the magnetic lines of force nearer the walls of the tube. (AEC)

  14. Davies Critical Point and Tunneling

    NASA Astrophysics Data System (ADS)

    La, Hoseong

    2012-04-01

    From the point of view of tunneling, the physical meaning of the Davies critical point of a second-order phase transition in the black hole thermodynamics is clarified. At the critical point, the nonthermal contribution vanishes so that the black hole radiation is entirely thermal. It separates two phases: one with radiation enhanced by the nonthermal contribution, the other suppressed by the nonthermal contribution. We show this in both charged and rotating black holes. The phase transition is also analyzed in the cases in which emissions of charges and angular momenta are incorporated.

  15. Reactor

    DOEpatents

    Evans, Robert M.

    1976-10-05

    1. A neutronic reactor having a moderator, coolant tubes traversing the moderator from an inlet end to an outlet end, bodies of material fissionable by neutrons of thermal energy disposed within the coolant tubes, and means for circulating water through said coolant tubes characterized by the improved construction wherein the coolant tubes are constructed of aluminum having an outer diameter of 1.729 inches and a wall thickness of 0.059 inch, and the means for circulating a liquid coolant through the tubes includes a source of water at a pressure of approximately 350 pounds per square inch connected to the inlet end of the tubes, and said construction including a pressure reducing orifice disposed at the inlet ends of the tubes reducing the pressure of the water by approximately 150 pounds per square inch.

  16. Cloud streets in Davis Strait

    NASA Image and Video Library

    2017-09-27

    The late winter sun shone brightly on a stunning scene of clouds and ice in the Davis Strait in late February, 2013. The Moderate Resolution Imaging Spectroradiometer aboard NASA’s Aqua satellite captured this true-color image on February 22 at 1625 UTC. The Davis Strait connects the Labrador Sea (part of the Atlantic Ocean) in the south with Baffin Bay to the north, and separates Canada, to the west, from Greenland to the east. Strong, steady winds frequently blow southward from the colder Baffin Bay to the warmer waters of the Labrador Sea. Over ice, the air is dry and no clouds form. However, as the Arctic air moves over the warmer, open water the rising moist air and the temperature differential gives rise to lines of clouds. In this image, the clouds are aligned in a beautiful, parallel pattern. Known as “cloud streets”, this pattern is formed in a low-level wind, with the clouds aligning in the direction of the wind. Credit: NASA/GSFC/Jeff Schmaltz/MODIS Land Rapid Response Team NASA image use policy. NASA Goddard Space Flight Center enables NASA’s mission through four scientific endeavors: Earth Science, Heliophysics, Solar System Exploration, and Astrophysics. Goddard plays a leading role in NASA’s accomplishments by contributing compelling scientific knowledge to advance the Agency’s mission. Follow us on Twitter Like us on Facebook Find us on Instagram

  17. Merton Davies (1917-2001)

    NASA Astrophysics Data System (ADS)

    Murray, Bruce C.; Johnson, Torrence V.

    Merton Davies passed away unexpectedly in April at age 83 due to complications from surgery. He will be remembered for establishing the prime meridian for essentially every solid planet in the solar system with the exception of Earth and Pluto. He was an AGU Fellow, and had been a member since 1970 (Planetary Sciences).In cartography and geodesy nothing is more fundamental than establishing the fiducial point to which all other measurements are related. For a planet, this is the location of the prime meridian—zero longitude. Upon this foundation is built the interconnected network of distance, angle, and time coordinates that tell one where one is and what time it is. Here on the Earth, contention for “ownership” of the prime meridian was for centuries a scientific, political, and commercial issue of great moment, before Greenwich finally became the choice of the world's maps. To have established the prime meridian for a single planet alone could be regarded as a major career achievement by any scientist—an instructive lens through which to view Davies' accomplishment.

  18. Environmental assessment overview, Davis Canyon site, Utah

    SciTech Connect

    none,

    1986-05-01

    In February 1983, the US Department of Energy (DOE) identified the Davis Canyon site in Utah as one of the nine potentially acceptable sites for a mined geologic repository for spent nuclear fuel and high-level radioactive waste. To determine their suitability, the Davis Canyon site and the eight other potentially acceptable sites have been evaluated in accordance with the DOE's General Guidelines for the Recommendation of Sites for the Nuclear Waste Repositories. The Davis Canyon site is in the Paradox Basin, which is one of five distinct geohydrologic settings considered for the first repository. On the basis of the evaluations reported in this EA, the DOE has found that the Davis Canyon site is not disqualified under the guidelines. On the basis of these findings, the DOE is nominating the Davis Canyon site as one of five sites suitable for characterization. 3 figs.

  19. 76 FR 19952 - Davy Crockett National Forest Resource Advisory Committee

    Federal Register 2010, 2011, 2012, 2013, 2014

    2011-04-11

    ... Davy Crockett National Forest Resource Advisory Committee AGENCY: Forest Service, USDA. ACTION: Notice of Public Meeting, Davy Crockett National Forest Resource Advisory Committee. SUMMARY: In accordance.... Department of Agriculture, Forest Service, Davy Crockett National Forest Resource Advisory Committee (RAC...

  20. Southwest coast of Greenland and Davis Strait

    NASA Technical Reports Server (NTRS)

    2002-01-01

    This true-color image was taken by MODIS as it passed over the southwest coast of Greenland (right) and the Davis Strait (center and left). The Davis Strait connects Baffin Bay to the north and the Labrador Sea to the south, and separates Greenland from Baffin Island, Canada. The Davis Strait is part of the Northwest Passage, a navigable seaway connecting the Atlantic Ocean and the Pacific Ocean. The image shows the prevailing currents in the area, with the warm water of a branch of the North Atlantic Drift flowing northward along the Greenland coast, and the cold, iceberg-filled Labrador Current flowing southward along the Baffin Island coast.

  1. Southwest coast of Greenland and Davis Strait

    NASA Technical Reports Server (NTRS)

    2002-01-01

    This true-color image was taken by MODIS as it passed over the southwest coast of Greenland (right) and the Davis Strait (center and left). The Davis Strait connects Baffin Bay to the north and the Labrador Sea to the south, and separates Greenland from Baffin Island, Canada. The Davis Strait is part of the Northwest Passage, a navigable seaway connecting the Atlantic Ocean and the Pacific Ocean. The image shows the prevailing currents in the area, with the warm water of a branch of the North Atlantic Drift flowing northward along the Greenland coast, and the cold, iceberg-filled Labrador Current flowing southward along the Baffin Island coast.

  2. Environmental assessment: Davis Canyon site, Utah

    SciTech Connect

    none,

    1986-05-01

    In February 1983, the US Department of Energy (DOE) identified the Davis Canyon site in Utah as one of the nine potentially acceptable sites for a mined geologic repository for spent nuclear fuel and high-level radioactive waste. To determine their suitability, the Davis Canyon site and the eight other potentially acceptable sites have been evaluated in accordance with the DOE's General Guidelines for the Recommendation of Sites for the Nuclear Waste Repositories. These evaluations were reported in draft environmental assessments (EAs), which were issued for public review and comment. After considering the comments received on the draft EAs, the DOE prepared the final EA. The Davis Canyon site is in the Paradox Basin, which is one of five distinct geohydrologic settings considering for the first repository. This setting contains one other potentially acceptable site -- the Lavender Canyon site. Although the Lavender Canyon site is suitable for site characterization, the DOE has concluded that the Davis Canyon site is the preferred site in the Paradox Basin. On the basis of the evaluations reported in this EA, the DOE has found that the Davis Canyon site is not disqualified under the guidelines. Furthermore, the DOE has found that the site is suitable for site characterization because the evidence does not support a conclusion that the site will not be able to meet each of the qualifying conditions specified in the guidelines. On the basis of these findings, the DOE is nominating the Davis Canyon site as one of five sites suitable for characterization.

  3. Environmental assessment: Davis Canyon site, Utah

    SciTech Connect

    none,

    1986-05-01

    In February 1983, the US Department of Energy (DOE) identified the Davis Canyon site in Utah as one of the nine potentially acceptable sites for a mined geologic repository for spent nuclear fuel and high- level radioactive waste. To determine their suitability, the Davis Canyon site and the eight other potentially acceptable sites have been evaluated in accordance with the DOE's General Guidelines for the Recommendation of Sites for the Nuclear Waste Repositories. These evaluations were reported in draft environmental assessments (EAs), which were issued for public review and comment. After considering the comments received on the draft EAs, the DOE prepared the final EA. The Davis Canyon site is in the Paradox Basin, which is one of five distinct geohydrologic settings considered for the first repository. This setting contains one other potentially acceptable site -- the Lavender Canyon site. Although the Lavender Canyon site is suitable for site characterization, the DOE has concluded that the Davis Canyon site is the preferred site in the Paradox Basin. On the basis of the evaluations reported in this EA, the DOE has found that the Davis Canyon site is not disqualified under the guidelines. Furthermore, the DOE has found that the site is suitable for site characterization because the evidence does not support a conclusion that the site will not be able to meet each of the qualifying conditions specified in the guidelines. On the basis of these findings, the DOE is nominating the Davis Canyon site as one of the five sites suitable for characterization.

  4. 27 CFR 9.155 - Texas Davis Mountains.

    Code of Federal Regulations, 2010 CFR

    2010-04-01

    ... 27 Alcohol, Tobacco Products and Firearms 1 2010-04-01 2010-04-01 false Texas Davis Mountains. 9... Texas Davis Mountains. (a) Name. The name of the viticultural area described in this section is “Texas Davis Mountains.” (b) Approved map. The appropriate maps for determining the boundary of the Texas Davis...

  5. Obituary: Sumner P. Davis (1924-2008)

    NASA Astrophysics Data System (ADS)

    Feinberg, Jack

    2011-12-01

    University of California, Berkeley physicist Sumner P. Davis, a beloved teacher whose research centered on the optical spectroscopy of diatomic molecules found in the sun and other stars, died Dec. 31, 2008 in El Cerrito, CA after a brief illness. He was 84. After his military service during WWII, Davis finished his undergraduate work at UCLA in 1947, pursuing spectroscopy under the guidance of Joseph Ellis. Davis trained as a graduate student under molecular spectroscopist Francis Jenkins at UC Berkeley, where Davis used his ham radio expertise to construct an RF discharge to excite isotopes of diatomic selenium for his thesis. After receiving his Ph.D. from UC Berkeley, Davis went to MIT to postdoc under George Harrison, the premier artisan of finely-ruled diffraction gratings. In 1959, Jenkins invited Davis back to UC Berkeley to join the physics faculty, and Davis brought with him a highly prized gift - a diffraction grating presented to him by Harrison which Davis used for years to measure molecular spectra. At UC Berkeley Davis constructed a walk-in 15-foot-long spectrometer to produce detailed spectra of diatomic molecules of interest to astrophysics. With John G. Phillips he measured with high-precision the molecular constants of CN, C2, FeH, CS, SH and SiC2, TiO and others. Davis also studied the effect of the nuclear structure of Hg and Se on their optical spectra. He authored a book, Diffraction Grating Spectographs (1970), as well as monographs on CN and C2 spectra. Davis frequently traveled to the National Solar Observatory at Kitt Peak, to collect laboratory data using their Fourier transform spectrometer. He coauthored the book Fourier Transform Spectrometry (2001) with Mark C. Abrams and James Brault. In 1989, while returning to California after a long session on the spectrometer, his car, driven by Grace, his wife of 42 years, went off the road. Grace was killed but Sumner survived. Sumner Davis was, first and foremost, a consummate teacher

  6. Environmental assessment: Davis Canyon site, Utah

    SciTech Connect

    none,

    1986-05-01

    In February 1983, the US Department of Energy (DOE) identified the Davis Canyon site in Utah as one of the nine potentially acceptable sites for a mined geologic repository for spent nuclear fuel and high-level radioactive waste. To determine their suitability, the Davis Canyon site and the eight other potentially acceptable sites have been evaluated in accordance with the DOE's General Guidelines for the Recommendation of Sites for the Nuclear Waste Repositories. These evaluations were reported in draft environmental assessments (EAs), which were issued for public review and comment. After considering the comments received on the draft EAs, the DOE prepared the final EA. The Davis Canyon site is in the Paradox Basin, which is one of five distinct geohydrologic settings considered for the first repository. This setting contains one other potentially acceptable site -- the Lavender Canyon site. Although the Lavender Canyon site is suitable for site characterization, the DOE has concluded that the Davis Canyon site is the preferred site in the Paradox Basin. On the basis of the evaluations reported in this EA, the DOE has found that the Davis Canyon site is not disqualified under the guidelines. Furthermore, the DOE has fond that the site is suitable for site characterization because the evidence does not support a conclusion that the site will not be able to meet each of the qualifying conditions specified in the guidelines. On the basis of these findings, the DOE is nominating the Davis Canyon site as one of five sites suitable for characterization. 181 figs., 175 tabs.

  7. First Davis Strait discovery overcomes offshore hazards

    SciTech Connect

    Munro, R.G.

    1982-04-01

    In spite of icebergs umpredictable currents and brief drilling seasons, the first discovery well was completed recently in the Davis Strait. The success of this well, known as Hekja 0-71, has opened the waters off the northeastern coast of Canada to more exploration. A discussion is presented of how the well was drilled, the problems encountered and how they were overcome.

  8. Davis PV plant operation and maintenance manual

    SciTech Connect

    1994-09-01

    This operation and maintenance manual contains the information necessary to run the Photovoltaics for Utility Scale Applications (PVUSA) test facility in Davis, California. References to more specific information available in drawings, data sheets, files, or vendor manuals are included. The PVUSA is a national cooperative research and demonstration program formed in 1987 to assess the potential of utility scale photovoltaic systems.

  9. Obituary: Leverett Davis, Jr., 1914-2003

    NASA Astrophysics Data System (ADS)

    Jokipii, Jack Randolph

    2004-12-01

    Professor Leverett Davis Jr., Professor of theoretical physics at the California Institute of Technology, died on June 15, 2003 after a long illness. He was 89 years old. He contributed many important ideas and concepts to theoretical astrophysics and was a pioneer in the in situ scientific exploration of space using observations from spacecraft. Davis was born in Elgin, Illinois on March 3, 1914, the eldest of four children of Louis Leverett Davis and Susan Gulick Davis. His parents moved several times as he grew up because his father, a mining engineer, became involved in different mining operations in the American West. Leverett married Victoria Stocker in June 1943. They had two children who died in childhood and subsequently adopted a son, Jeffrey. His wife and son survive him. Davis's early education was rather fractured and uneven because of the many family moves, with periods of home schooling alternating with regular school. His high school education was, on the other hand, reasonably normal. It was while in high school that he decided that he wanted to do physics or mathematics. He went on to earn his Bachelor of Science degree at Oregon State College in 1936, after which he started graduate studies at the California Institute of Technology, to pursue a graduate degree in physics. His advisor was William V. Houston and Davis received his PhD in 1941 for a thesis on electrical properties in nerves. He briefly entertained the idea of changing to work in biophysics. During World War II, Davis became an integral member of the Caltech project for rockets, which developed a number of different types of rockets used in the war. As a result of this war work, Davis wrote a book on Exterior Ballistics, published by Van Nostrand in 1958. He joined the faculty at the California Institute of Technology in 1946, after several years on campus as an instructor. In all, he taught there for nearly four decades before retiring as Professor of Theoretical Physics in 1981

  10. 48 CFR 22.403-1 - Davis-Bacon Act.

    Code of Federal Regulations, 2013 CFR

    2013-10-01

    ... 48 Federal Acquisition Regulations System 1 2013-10-01 2013-10-01 false Davis-Bacon Act. 22.403-1 Section 22.403-1 Federal Acquisition Regulations System FEDERAL ACQUISITION REGULATION SOCIOECONOMIC... Construction 22.403-1 Davis-Bacon Act. The Davis-Bacon Act (40 U.S.C. 3141 et seq.) provides that contracts...

  11. 48 CFR 22.403-1 - Davis-Bacon Act.

    Code of Federal Regulations, 2012 CFR

    2012-10-01

    ... 48 Federal Acquisition Regulations System 1 2012-10-01 2012-10-01 false Davis-Bacon Act. 22.403-1 Section 22.403-1 Federal Acquisition Regulations System FEDERAL ACQUISITION REGULATION SOCIOECONOMIC... Construction 22.403-1 Davis-Bacon Act. The Davis-Bacon Act (40 U.S.C. 3141 et seq.) provides that contracts...

  12. 48 CFR 22.403-1 - Davis-Bacon Act.

    Code of Federal Regulations, 2011 CFR

    2011-10-01

    ... 48 Federal Acquisition Regulations System 1 2011-10-01 2011-10-01 false Davis-Bacon Act. 22.403-1 Section 22.403-1 Federal Acquisition Regulations System FEDERAL ACQUISITION REGULATION SOCIOECONOMIC... Construction 22.403-1 Davis-Bacon Act. The Davis-Bacon Act (40 U.S.C. 3141 et seq.) provides that contracts...

  13. 48 CFR 22.403-1 - Davis-Bacon Act.

    Code of Federal Regulations, 2010 CFR

    2010-10-01

    ... 48 Federal Acquisition Regulations System 1 2010-10-01 2010-10-01 false Davis-Bacon Act. 22.403-1 Section 22.403-1 Federal Acquisition Regulations System FEDERAL ACQUISITION REGULATION SOCIOECONOMIC... Construction 22.403-1 Davis-Bacon Act. The Davis-Bacon Act (40 U.S.C. 3141 et seq.) provides that contracts...

  14. Loss of main and auxiliary feedwater event at the Davis-Besse Plant on June 9, 1985

    SciTech Connect

    1985-07-01

    On June 9, 1985, Toledo Edison Company's Davis-Besse Nuclear Power Plant, located in Ottawa County, Ohio, experienced a partial loss of feedwater while the plant was operating at 90% power. Following a reactor trip, a loss of all feedwater occurred. The event involved a number of equipment malfunctions and extensive operator actions, including operator actions outside the control room. Several operator errors also occurred during the event. This report documents the findings of an NRC Team sent to Davis-Besse by the NRC Executive Director for Operations in conformance with the staff-proposed Incident Investigation Program.

  15. John Staige Davis: pioneer American plastic surgeon.

    PubMed

    Sargent, L A; Morgan, R F; Davis, W B

    1983-10-01

    John Staige Davis was the first surgeon to devote his entire practice to plastic surgery and worked exclusively for its recognition as a specialty. He wrote the first American text on plastic surgery, published 78 papers on a wide range of subjects in plastic surgery, was the first to establish a formal training program in plastic surgery in 1924, and was the first Chairman of the American Board of Plastic Surgery.

  16. UC Davis Center for Digital Security

    DTIC Science & Technology

    2008-02-19

    currently valid OMB control number PLEASE DO NOT RETURN YOUR FORM TO THE ABOVE ADDRESS. 1. REPORT DATE (DD-MM-YYYY) 2 /6/08 2 . REPORT TYPE...Processing (page 1). 2 . Modeling Communication Losses and Interference in Fiber Optic Systems (page 9). 3. Low Detectability Optical Code-Division... 2 DTIC Data Purchase Request Number: FQ8671-0600473 BPN: F1ATA05258B473 Proposal Number: 04-NM-045 Research Title: UC DAVIS CENTER FOR DIGITAL

  17. Non-Bunch-Davies statistical anisotropies

    SciTech Connect

    Chen, Xingang; Wang, Yi E-mail: yi.wang@ipmu.jp

    2014-07-01

    We introduce a generic mechanism that can extend the effects of relic anisotropies at the beginning of inflation to relatively much shorter scales in density perturbations. This is induced by non-Bunch-Davies states of the quantum fluctuations, and can show up in the non-oscillatory components of the density perturbations. This mechanism works for general forms of anisotropies, and, to illustrate it, we use an example of relic vector field. The detailed scale-dependence of these anisotropies can be used to probe the initial quantum state of our universe.

  18. Water resources of Jefferson Davis Parish, Louisiana

    USGS Publications Warehouse

    White, Vincent E.; Prakken, Lawrence B.

    2014-01-01

    Information concerning the availability, use, and quality of water in Jefferson Davis Parish, Louisiana, is critical for proper water-supply management. The purpose of this fact sheet is to present information that can be used by water managers, parish residents, and others for stewardship of this vital resource. Information on the availability, past and current use, use trends, and water quality from groundwater and surface-water sources in the parish is presented. Previously published reports and data stored in the U.S. Geological Survey’s National Water Information System (http://waterdata.usgs.gov/nwis) are the primary sources of the information presented here.

  19. Quantum cloning disturbed by thermal Davies environment

    NASA Astrophysics Data System (ADS)

    Dajka, Jerzy; Łuczka, Jerzy

    2016-06-01

    A network of quantum gates designed to implement universal quantum cloning machine is studied. We analyze how thermal environment coupled to auxiliary qubits, `blank paper' and `toner' required at the preparation stage of copying, modifies an output fidelity of the cloner. Thermal environment is described in terms of the Markovian Davies theory. We show that such a cloning machine is not universal any more but its output is independent of at least a part of parameters of the environment. As a case study, we consider cloning of states in a six-state cryptography's protocol. We also briefly discuss cloning of arbitrary input states.

  20. Isotopic Survey of Lake Davis and the Local Groundwater

    SciTech Connect

    Ridley, M N; Moran, J E; Singleton, M J

    2007-08-21

    In September 2007, California Fish and Game (CAFG) plans to eradicate the northern pike from Lake Davis. As a result of the eradication treatment, local residents have concerns that the treatment might impact the local groundwater quality. To address the concerns of the residents, Lawrence Livermore National Laboratory (LLNL) recommended measuring the naturally occurring stable oxygen isotopes in local groundwater wells, Lake Davis, and the Lake Davis tributaries. The purpose of these measurements is to determine if the source of the local groundwater is either rain/snowmelt, Lake Davis/Big Grizzly Creek water or a mixture of Lake Davis/Big Grizzly Creek and rain/snowmelt. As a result of natural evaporation, Lake Davis and the water flowing into Big Grizzly Creek are naturally enriched in {sup 18}oxygen ({sup 18}O), and if a source of a well's water is Lake Davis or Big Grizzly Creek, the well water will contain a much higher concentration of {sup 18}O. This survey will allow for the identification of groundwater wells whose water source is Lake Davis or Big Grizzly Creek. The results of this survey will be useful in the development of a water-quality monitoring program for the upcoming Lake Davis treatment. LLNL analyzed 167 groundwater wells (Table 1), 12 monthly samples from Lake Davis (Table 2), 3 samples from Lake Davis tributaries (Table 2), and 8 Big Grizzly Creek samples (Table 2). Of the 167 groundwater wells sampled and analyzed, only 2 wells contained a significant component of evaporated water, with an isotope composition similar to Lake Davis water. The other 163 groundwater wells have isotope compositions which indicate that their water source is rain/snowmelt.

  1. 45 CFR 2543.83 - Davis-Bacon Act.

    Code of Federal Regulations, 2011 CFR

    2011-10-01

    ... 45 Public Welfare 4 2011-10-01 2011-10-01 false Davis-Bacon Act. 2543.83 Section 2543.83 Public... ORGANIZATIONS Statutory Compliance § 2543.83 Davis-Bacon Act. When required by Federal program legislation, all... for compliance with the Davis-Bacon Act (40 U.S.C. 276a to a-7) and as supplemented by Department...

  2. 45 CFR 1309.54 - Davis-Bacon Act.

    Code of Federal Regulations, 2013 CFR

    2013-10-01

    ... 45 Public Welfare 4 2013-10-01 2013-10-01 false Davis-Bacon Act. 1309.54 Section 1309.54 Public... Renovation § 1309.54 Davis-Bacon Act. Construction and renovation projects and subcontracts financed with funds awarded under the Head Start program are subject to the Davis-Bacon Act (40 U.S.C. 276a et...

  3. 45 CFR 2543.83 - Davis-Bacon Act.

    Code of Federal Regulations, 2014 CFR

    2014-10-01

    ... 45 Public Welfare 4 2014-10-01 2014-10-01 false Davis-Bacon Act. 2543.83 Section 2543.83 Public... ORGANIZATIONS Statutory Compliance § 2543.83 Davis-Bacon Act. When required by Federal program legislation, all... for compliance with the Davis-Bacon Act (40 U.S.C. 276a to a-7) and as supplemented by Department...

  4. 45 CFR 2543.83 - Davis-Bacon Act.

    Code of Federal Regulations, 2013 CFR

    2013-10-01

    ... 45 Public Welfare 4 2013-10-01 2013-10-01 false Davis-Bacon Act. 2543.83 Section 2543.83 Public... ORGANIZATIONS Statutory Compliance § 2543.83 Davis-Bacon Act. When required by Federal program legislation, all... for compliance with the Davis-Bacon Act (40 U.S.C. 276a to a-7) and as supplemented by Department...

  5. 45 CFR 1309.54 - Davis-Bacon Act.

    Code of Federal Regulations, 2011 CFR

    2011-10-01

    ... 45 Public Welfare 4 2011-10-01 2011-10-01 false Davis-Bacon Act. 1309.54 Section 1309.54 Public... Renovation § 1309.54 Davis-Bacon Act. Construction and renovation projects and subcontracts financed with funds awarded under the Head Start program are subject to the Davis-Bacon Act (40 U.S.C. 276a et...

  6. 45 CFR 2543.83 - Davis-Bacon Act.

    Code of Federal Regulations, 2010 CFR

    2010-10-01

    ... 45 Public Welfare 4 2010-10-01 2010-10-01 false Davis-Bacon Act. 2543.83 Section 2543.83 Public... ORGANIZATIONS Statutory Compliance § 2543.83 Davis-Bacon Act. When required by Federal program legislation, all... for compliance with the Davis-Bacon Act (40 U.S.C. 276a to a-7) and as supplemented by Department...

  7. 45 CFR 2543.83 - Davis-Bacon Act.

    Code of Federal Regulations, 2012 CFR

    2012-10-01

    ... 45 Public Welfare 4 2012-10-01 2012-10-01 false Davis-Bacon Act. 2543.83 Section 2543.83 Public... ORGANIZATIONS Statutory Compliance § 2543.83 Davis-Bacon Act. When required by Federal program legislation, all... for compliance with the Davis-Bacon Act (40 U.S.C. 276a to a-7) and as supplemented by Department...

  8. 45 CFR 1309.54 - Davis-Bacon Act.

    Code of Federal Regulations, 2012 CFR

    2012-10-01

    ... 45 Public Welfare 4 2012-10-01 2012-10-01 false Davis-Bacon Act. 1309.54 Section 1309.54 Public... Renovation § 1309.54 Davis-Bacon Act. Construction and renovation projects and subcontracts financed with funds awarded under the Head Start program are subject to the Davis-Bacon Act (40 U.S.C. 276a et...

  9. 45 CFR 1309.54 - Davis-Bacon Act.

    Code of Federal Regulations, 2014 CFR

    2014-10-01

    ... 45 Public Welfare 4 2014-10-01 2014-10-01 false Davis-Bacon Act. 1309.54 Section 1309.54 Public... Renovation § 1309.54 Davis-Bacon Act. Construction and renovation projects and subcontracts financed with funds awarded under the Head Start program are subject to the Davis-Bacon Act (40 U.S.C. 276a et...

  10. Interview with Justin Davies and Andrew Tochterman.

    PubMed

    Davies, Justin; Tochterman, Andrew

    2017-07-01

    Justin Davies and Andrew Tochterman speak to Adam Price-Evans, Commissioning Editor of Future Cardiology: Justin Davies is a Senior Research Fellow and Honorary Consultant Cardiologist at the National Heart and Lung Institute, Imperial College London (UK). His main research interests include the development and application of pioneering technologies in engineering to aid understanding of disease mechanisms, and in the diagnosis of pathological disease states. After completing his undergraduate training at Imperial College, he was awarded a prestigious British Heart Foundation research fellowship to undertake his PhD at Imperial College. Since then, he has trained in interventional cardiology with a specialist interest in physiological and structural assessment of coronary disease states. In 2008, he was appointed as a Walport Clinical Lecturer to support his research activities alongside his ongoing clinical commitments. Born in Greentown, Indiana (USA), Andrew holds a BSc in Chemical Engineering from Rose-Hulman Institute of Technology (IN, USA) and an MBA from the Wharton Business School (PA, USA). His experience includes roles in Quality Engineering, R&D, Clinical & Product Marketing, Marketing Management and Sales at Guidant Corporation/Abbott Vascular. Andrew joined Philips Image Guided Therapy (CA, USA) in 2012, helping launch the instant wave-free ratio (iFR) product in Europe and the United States before taking on greater responsibilities as the Physiology Segment Leader, and later assuming his current role as Coronary Segment Leader at Philips Image Guided Therapy (CA, USA).

  11. Charles Davies Sherborn and the "Indexer's Club".

    PubMed

    Evenhuis, Neal L

    2016-01-01

    The first few words of the title of this symposium are "Anchoring Biodiversity Information". In order to properly anchor anything for a long-lasting future, a solid foundation needs to have been laid. For the zoological portion of biodiversity information, that firm foundation is best exemplified in the works of Charles Davies Sherborn. This man, like others of his ilk, was intimately focused on indexing names. This incredible focus was a life-long passion for him and culminated in his 9500-page Index Animalium of over 400,000 names of animals. This Index represents not only one of the most prodigious efforts in publication by a single man and the single most important reference to names in zoology, but a permanent legacy to the efforts of an indexer that proved to be an inspiration to many.

  12. Davis D. Sentman (1945-2011)

    NASA Astrophysics Data System (ADS)

    Williams, Earle; Sabbas, Fernanda Sao; Shaw, Glenn; Nielsen, Hans

    2012-09-01

    Davis D. Sentman, a geophysicist with wide-ranging interests but with a primary focus on atmospheric electricity and the originator of the term "sprites" for a type of lightning flash in the mesosphere, first appeared on the planet in a farming community in Iowa City, Iowa, on 19 January 1945. It is noteworthy that when Dave was only 6 months old, his father was struck and killed by lightning while on a tractor. Much later, after a 4-year stint in the U.S. Air Force and service in the Peace Corps in Kenya, Dave studied mathematics and went on to the University of Iowa to do graduate work with James Van Allen on early space missions, including the 1973 Jupiter encounters by the Pioneer 10 and 11 satellites. At the University of Iowa, he worked on energetic electrons and associated whistler waves in the Jovian inner magnetosphere.

  13. 40 Years in Applied Linguistics: An Interview with Alan Davies

    ERIC Educational Resources Information Center

    Kunnan, Antony John

    2005-01-01

    This article presents an interview with Professor Alan Davies who was born in Wales, studied at Oxford University and Birmingham University, and taught in Scotland at the University of Edinburgh, completing 40 years this year. Professor Davies has travelled widely to give invited talks and seminars, participate in applied linguistics conferences,…

  14. Persistence and Graduation of UC Davis Undergraduates: 1971-1983.

    ERIC Educational Resources Information Center

    Amos, Arthur K., Jr.

    Persistence and graduation rates of four types of undergraduate students at the University of California, Davis, (UC Davis) are examined: domestic students with fewer than 12.5 college transfer units, including both regularly admitted students and those admitted by special action; and domestic students admitted with at least 84 but less than 135…

  15. Writing in the Margins: An Interview with Bob Davis

    ERIC Educational Resources Information Center

    Locke, Kirsten

    2017-01-01

    Bob Davis is Editor of the "Journal of Philosophy of Education" and is Head of School and Professor of Religious and Cultural Education in the School of Education Administration at the University of Glasgow. In this interview Davis provides his insight on topics such as the role of learned societies in philosophy of education,…

  16. Astronaut Jan Davis monitors Commercial Protein Crystal Growth experiment

    NASA Image and Video Library

    1994-02-03

    STS060-21-031 (3-11 Feb 1994) --- Using a lap top computer, astronaut N. Jan Davis monitors systems for the Commercial Protein Crystal Growth (CPCG) experiment onboard the Space Shuttle Discovery. Davis joined four other NASA astronauts and a Russian cosmonaut for eight days in space aboard Discovery.

  17. 40 Years in Applied Linguistics: An Interview with Alan Davies

    ERIC Educational Resources Information Center

    Kunnan, Antony John

    2005-01-01

    This article presents an interview with Professor Alan Davies who was born in Wales, studied at Oxford University and Birmingham University, and taught in Scotland at the University of Edinburgh, completing 40 years this year. Professor Davies has travelled widely to give invited talks and seminars, participate in applied linguistics conferences,…

  18. Writing in the Margins: An Interview with Bob Davis

    ERIC Educational Resources Information Center

    Locke, Kirsten

    2017-01-01

    Bob Davis is Editor of the "Journal of Philosophy of Education" and is Head of School and Professor of Religious and Cultural Education in the School of Education Administration at the University of Glasgow. In this interview Davis provides his insight on topics such as the role of learned societies in philosophy of education,…

  19. Algebraic Davis Decomposition and Asymmetric Doob Inequalities

    NASA Astrophysics Data System (ADS)

    Hong, Guixiang; Junge, Marius; Parcet, Javier

    2016-09-01

    In this paper we investigate asymmetric forms of Doob maximal inequality. The asymmetry is imposed by noncommutativity. Let {({M}, τ)} be a noncommutative probability space equipped with a filtration of von Neumann subalgebras {({M}_n)_{n ≥ 1}}, whose union {bigcup_{n≥1}{M}_n} is weak-* dense in {{M}}. Let {{E}_n} denote the corresponding family of conditional expectations. As an illustration for an asymmetric result, we prove that for {1 < p < 2} and {x in L_p({M},τ)} one can find {a, b in L_p({M},τ)} and contractions {u_n, v_n in {M}} such that {E}_n(x) = a u_n + v_n b quad and quad max big{ |a|_p,|b|_p big} ≤ c_p |x|_p. Moreover, it turns out that {a u_n} and {v_n b} converge in the row/column Hardy spaces {{H}_p^r({M})} and {{H}_p^c({M})} respectively. In particular, this solves a problem posed by the Defant and Junge in 2004. In the case p = 1, our results establish a noncommutative form of the Davis celebrated theorem on the relation betwe en martingale maximal and square functions in L 1, whose noncommutative form has remained open for quite some time. Given {1 ≤ p ≤ 2}, we also provide new weak type maximal estimates, which imply in turn left/right almost uniform convergence of {{E}_n(x)} in row/column Hardy spaces. This improves the bilateral convergence known so far. Our approach is based on new forms of Davis martingale decomposition which are of independent interest, and an algebraic atomic description for the involved Hardy spaces. The latter results are new even for commutative von Neumann algebras.

  20. Geology of the Davis Mesa quadrangle, Colorado

    USGS Publications Warehouse

    Cater, Fred W.; Bryner, Leonid

    1953-01-01

    The Davis Mesa quadrangle is one of eighteen 7 1/2-minute quadrangles covering the principal carnotite-producing area of southwestern Colorado. The geology of these quadrangles was mapped by the U.S. Geological Survey for the Atomic Energy Commission as part of a comprehensive study of carnotite deposits. The rocks exposed in the eighteen quadrangles consist of crystalline rocks of pre-Cambrian age and sedimentary rocks that range in age from late Paleozoic to Quaternary. Over much of the area the sedimentary rocks are flat lying, but in places the rocks are disrupted by hih-angle faults, and northwest-trending folds. Conspicuous among the folds are large anticlines having cores of intrusive salt and gypsum. Most of the carnotite deposits are confined to the Salt Wash sandstone member of Jurassic Morrison formation. Within this sandstone, most of the deposits are spottily distributed through an arcuate zone known as "Uruvan Mineral Belt". Individual deposits range in size from irregular masses containing only a few tons of ore to large, tabular masses containing many thousands of tons. The ore consists largely of sandstone selectively impregnated and in part replaced by uranium and vanadium minerals. Most of the deposits appear to be related to certain sedimentary structures in sandstones of favorable composition.

  1. Brownfields Davis Bacon for Cleanup Grants: Petroleum for Government Entities

    EPA Pesticide Factsheets

    Terms & conditions specify how Recipients will assist EPA in meeting its Davis Bacon responsibilities when DB applies to EPA awards of financial assistance under the Recovery Act or any other statute which makes DB applicable to EPA financial assistance.

  2. Contextual view between Fyffe and Davis Avenues and Maas Drive. ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    Contextual view between Fyffe and Davis Avenues and Maas Drive. Material handling equipment shop (storage warehouse, building no. 517) is shown in background. Camera facing northeast. - Naval Supply Annex Stockton, Rough & Ready Island, Stockton, San Joaquin County, CA

  3. Contextual view between Fyffe and Davis Avenues and Maas Drive. ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    Contextual view between Fyffe and Davis Avenues and Maas Drive. Material handling equipment shop (storage warehouse. Building no. 517) is shown in background. Camera facing northwest. - Naval Supply Annex Stockton, Rough & Ready Island, Stockton, San Joaquin County, CA

  4. 41. SWITCH BACK IN DAVIS CUTOFF ROAD AT LITTLE CRANE ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    41. SWITCH BACK IN DAVIS CUT-OFF ROAD AT LITTLE CRANE CREEK. NOTE STONE CULVERT BRIDGE AT BOTTOM AND CRANE FALLS BRIDGE AT TOP. - Yosemite National Park Roads & Bridges, Yosemite Village, Mariposa County, CA

  5. 75 FR 62627 - Environmental Impact Statement; Davis County, UT

    Federal Register 2010, 2011, 2012, 2013, 2014

    2010-10-12

    ... that an Environmental Impact Statement (EIS) will be prepared for proposed transportation improvements... From the Federal Register Online via the Government Publishing Office DEPARTMENT OF TRANSPORTATION Federal Highway Administration Environmental Impact Statement; Davis County, UT AGENCY: Federal Highway...

  6. An investigation of home disadvantage in Davis Cup tennis.

    PubMed

    Gayton, William F; Steinroeder, William; Bonnica, Corrine; Loignon, Andrew C

    2009-10-01

    Occurrence of the home disadvantage in Davis Cup tennis matches was examined by analyzing the outcome of Davis Cup finals matches from 1900 to 2007. There was no significant home disadvantage when Matches 1 and 2 were compared with Matches 4 and 5. However, there was a significant home disadvantage when Matches 1 and 2 were compared with Match 5. These findings are compared with those from earlier studies in which data from professional basketball and baseball were examined.

  7. Reactor Pressure Vessel Head Packaging & Disposal

    SciTech Connect

    Wheeler, D. M.; Posivak, E.; Freitag, A.; Geddes, B.

    2003-02-26

    Reactor Pressure Vessel (RPV) Head replacements have come to the forefront due to erosion/corrosion and wastage problems resulting from the susceptibility of the RPV Head alloy steel material to water/boric acid corrosion from reactor coolant leakage through the various RPV Head penetrations. A case in point is the recent Davis-Besse RPV Head project, where detailed inspections in early 2002 revealed significant wastage of head material adjacent to one of the Control Rod Drive Mechanism (CRDM) nozzles. In lieu of making ASME weld repairs to the damaged head, Davis-Besse made the decision to replace the RPV Head. The decision was made on the basis that the required weld repair would be too extensive and almost impractical. This paper presents the packaging, transport, and disposal considerations for the damaged Davis-Besse RPV Head. It addresses the requirements necessary to meet Davis Besse needs, as well as the regulatory criteria, for shipping and burial of the head. It focuses on the radiological characterization, shipping/disposal package design, site preparation and packaging, and the transportation and emergency response plans that were developed for the Davis-Besse RPV Head project.

  8. Davis takes the reins of JGR—Solid Earth

    NASA Astrophysics Data System (ADS)

    Paul M. Davis is looking forward to carrying on the tradition of excellence that William Hinze and the associate editors have established for his term, which will formally begin January 1997 and end December 2000. He shares in the excitement of discovery as he assists new manuscripts on their path toward publication. “As I take on the reins as new editor, I am in awe of the excellent job done by William Hinze and his staff, and it has become all too clear the debt so many of us owe to Bill,” Davis commented.

  9. Boldness and predator deterrence: a critique of Godin & Davis.

    PubMed

    Milinski, M; Boltshauser, P

    1995-10-23

    Godin & Davis (1995) claimed to have provided experimental evidence for a predator pursuit deterrence function of predator inspection in the guppy. We doubt that they have shown that inspection behaviour per se deters attack because their evidence is actually correlational and thus inherently ambiguous; furthermore we think their methods are flawed.

  10. 45 CFR 1309.54 - Davis-Bacon Act.

    Code of Federal Regulations, 2010 CFR

    2010-10-01

    ... PROGRAM HEAD START FACILITIES PURCHASE, MAJOR RENOVATION AND CONSTRUCTION Construction and Major Renovation § 1309.54 Davis-Bacon Act. Construction and renovation projects and subcontracts financed with... renovation of affected Head Start facilities shall be paid wages at not less than those prevailing on similar...

  11. A Critical Analysis of Siobhan Davies's "White Man Sleeps," 1998

    ERIC Educational Resources Information Center

    Gregory, Katie

    2005-01-01

    This critical analysis focuses on the movement vocabulary and interaction of dancers in selected sections of the filmed version of "White Man Sleeps" (1988) by Siobhan Davies. The choreography is divided into five distinct parts, in accordance with divisions in the musical accompaniment from which the piece takes its name, a suite of…

  12. Long-term sustainability in Davis Late Successional Reserve

    Treesearch

    Jim Stone; Joan Kittrell

    2004-01-01

    A pilot watershed analysis along with the Davis Late Successional Reserve analysis in the range of the northern spotted owl identified potential loss of suitable habitat, reduction in the numbers of large trees, and lack of replacements for large trees. A variety of silvicultural thinning techniques has been used to address these important issues and to move toward a...

  13. 10. Detail of map showing Battery Davis and Panama Gun ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    10. Detail of map showing Battery Davis and Panama Gun Mounts at right, by U.S. Engineering Office, San Francisco, California, August 5, 1934. - Fort Funston, Panama Mounts for 155mm Guns, Skyline Boulevard & Great Highway, San Francisco, San Francisco County, CA

  14. Davis Fire: Fire behavior and fire effects analysis

    Treesearch

    LaWen T. Hollingsworth

    2010-01-01

    The Davis Fire presents an interesting example of fire behavior in subalpine fir, partially dead lodgepole pine with multiple age classes, and moist site Douglas-fir vegetation types. This has been summer of moderate temperatures and intermittent moisture that has kept live herbaceous and live woody moistures fairly high and dead fuel moistures at a moderate level....

  15. 48 CFR 52.222-6 - Davis-Bacon Act.

    Code of Federal Regulations, 2010 CFR

    2010-10-01

    ... or nearly so, to the performance of a contract. (b)(1) All laborers and mechanics employed or working... contractual relationship which may be alleged to exist between the Contractor and such laborers and mechanics... fide fringe benefits under section 1(b)(2) of the Davis-Bacon Act on behalf of laborers or mechanics...

  16. 48 CFR 52.222-6 - Davis-Bacon Act.

    Code of Federal Regulations, 2012 CFR

    2012-10-01

    ... or nearly so, to the performance of a contract. (b)(1) All laborers and mechanics employed or working... contractual relationship which may be alleged to exist between the Contractor and such laborers and mechanics... fide fringe benefits under section 1(b)(2) of the Davis-Bacon Act on behalf of laborers or mechanics...

  17. 48 CFR 52.222-6 - Davis-Bacon Act.

    Code of Federal Regulations, 2011 CFR

    2011-10-01

    ... or nearly so, to the performance of a contract. (b)(1) All laborers and mechanics employed or working... contractual relationship which may be alleged to exist between the Contractor and such laborers and mechanics... fide fringe benefits under section 1(b)(2) of the Davis-Bacon Act on behalf of laborers or mechanics...

  18. Onboard photo: Astronaut Jan Davis inside Spacelab-J module

    NASA Technical Reports Server (NTRS)

    1992-01-01

    Space Shuttle Endeavour (STS-47) onboard photo of Astronaut N. Jan Davis at work at the Continuous Heating Furnace (CHF) in the Spacelab-J Science Module. Spacelab-J is a combined National Space Development Agency of Japan (NASDA) and NASA mission. The objectives included life sciences, microgravity and technology research.

  19. The Davis Social Environment-1990: A Report of Student Opinions.

    ERIC Educational Resources Information Center

    Low, Jane M.

    A study was done to examine student opinion of the social environment on the University of California Davis campus in Spring 1990 as a follow up to a similar study conducted in 1987. The study used the Student Opinion Survey and mailed it to a stratified random sample of 1,649 students. Of the surveys sent, 57.7 percent were returned. The…

  20. Davis Street Magnet School: Linking Child Development with Literacy.

    ERIC Educational Resources Information Center

    Brown, Fay E.; Maholmes, Valerie; Murray, Edward T.; Nathan, Lola

    1998-01-01

    Describes the School Development Program of the Davis Street Magnet School, New Haven (Connecticut), a Comer school since the late 1980s. The program uses a number of strategies to develop literacy among students identified as problem readers. This Comerian approach enhances student development along six developmental pathways and strengthens…

  1. Interim Record of Decision Davis Global Communication Site. Draft Copy

    DTIC Science & Technology

    1994-07-18

    activated carbon gPm gallons per minute Ha hydrogen chloride HI Hazard Index HSWA Hazardous and Solid Waste Amendments ILCRZ increased lifetime...Act (RCRA), as amended by Hazardous and Solid Waste Amendments (HSWA). The decision for the Davis Site is based on the Administrative Record

  2. 2. VIEW OF SWITCHBACKS IN FORESTA ROAD (OLD DAVIS CUTOFF ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    2. VIEW OF SWITCHBACKS IN FORESTA ROAD (OLD DAVIS CUT-OFF ROAD). NOTE FORESTA ROAD BRIDGE IN LOWER LEFT. ROAD CURVE HIDDEN IN TREES AT CENTER. NOTE ROAD CUT AT LEFT. LOOKING SSW. GIS: N-37"40'47.4"/W-119"47'22.2 - Foresta Road, Yosemite Village, Mariposa County, CA

  3. The Davis-Bacon Act: An Appraisal of Recent Studies.

    ERIC Educational Resources Information Center

    Goldfarb, Robert S.; Morrall, John F., III

    1981-01-01

    Reviews the Davis-Bacon Act, including how its wage determinations compare to local construction wages as measured by sources other than the act's administrators; the effects of lags in the act's data-gathering process; and the savings that would result from changing the way prevailing rates are calculated. (CT)

  4. ETV REPORT - EVALUATION OF DAVIS TECHNOLOGIES INTERNATIONAL CORP. - INDUSTRIAL WASTEWATER TREATMENT PLANT

    EPA Science Inventory

    Abstract: Evaluation of Davis Technologies International Corp. Industrial Wastewater Treatment Plant

    The Davis Technologies International Corp. (DTIC) Industrial Wastewater Treatment Plant (IWTP) was tested, under actual production conditions, processing metalworking and ...

  5. ETV REPORT - EVALUATION OF DAVIS TECHNOLOGIES INTERNATIONAL CORP. - INDUSTRIAL WASTEWATER TREATMENT PLANT

    EPA Science Inventory

    Abstract: Evaluation of Davis Technologies International Corp. Industrial Wastewater Treatment Plant

    The Davis Technologies International Corp. (DTIC) Industrial Wastewater Treatment Plant (IWTP) was tested, under actual production conditions, processing metalworking and ...

  6. 29 CFR 5.22 - Effect of the Davis-Bacon fringe benefits provisions.

    Code of Federal Regulations, 2013 CFR

    2013-07-01

    ... 29 Labor 1 2013-07-01 2013-07-01 false Effect of the Davis-Bacon fringe benefits provisions. 5.22... Fringe Benefits Provisions of the Davis-Bacon Act § 5.22 Effect of the Davis-Bacon fringe benefits provisions. The Davis-Bacon Act and the prevailing wage provisions of the related statutes listed in § 1.1...

  7. 29 CFR 5.22 - Effect of the Davis-Bacon fringe benefits provisions.

    Code of Federal Regulations, 2010 CFR

    2010-07-01

    ... 29 Labor 1 2010-07-01 2010-07-01 true Effect of the Davis-Bacon fringe benefits provisions. 5.22... Fringe Benefits Provisions of the Davis-Bacon Act § 5.22 Effect of the Davis-Bacon fringe benefits provisions. The Davis-Bacon Act and the prevailing wage provisions of the related statutes listed in § 1.1...

  8. 29 CFR 5.22 - Effect of the Davis-Bacon fringe benefits provisions.

    Code of Federal Regulations, 2014 CFR

    2014-07-01

    ... 29 Labor 1 2014-07-01 2013-07-01 true Effect of the Davis-Bacon fringe benefits provisions. 5.22... Fringe Benefits Provisions of the Davis-Bacon Act § 5.22 Effect of the Davis-Bacon fringe benefits provisions. The Davis-Bacon Act and the prevailing wage provisions of the related statutes listed in § 1.1...

  9. 29 CFR 5.22 - Effect of the Davis-Bacon fringe benefits provisions.

    Code of Federal Regulations, 2011 CFR

    2011-07-01

    ... 29 Labor 1 2011-07-01 2011-07-01 false Effect of the Davis-Bacon fringe benefits provisions. 5.22... Fringe Benefits Provisions of the Davis-Bacon Act § 5.22 Effect of the Davis-Bacon fringe benefits provisions. The Davis-Bacon Act and the prevailing wage provisions of the related statutes listed in § 1.1...

  10. 29 CFR 5.22 - Effect of the Davis-Bacon fringe benefits provisions.

    Code of Federal Regulations, 2012 CFR

    2012-07-01

    ... 29 Labor 1 2012-07-01 2012-07-01 false Effect of the Davis-Bacon fringe benefits provisions. 5.22... Fringe Benefits Provisions of the Davis-Bacon Act § 5.22 Effect of the Davis-Bacon fringe benefits provisions. The Davis-Bacon Act and the prevailing wage provisions of the related statutes listed in § 1.1...

  11. 77 FR 13328 - Federal Acquisition Regulation; Information Collection; Davis Bacon Act-Price Adjustment (Actual...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2012-03-06

    ... Regulation; Information Collection; Davis Bacon Act--Price Adjustment (Actual Method) AGENCY: Department of... previously approved information collection requirement concerning the Davis-Bacon Act price adjustment... comments identified by Information Collection 9000- 0154, Davis Bacon Act--Price Adjustment (Actual Method...

  12. The College Selection Process of Freshmen Admitted to UC Davis: The Range of Choice.

    ERIC Educational Resources Information Center

    MacKenzie, Bonnie L.

    Considerations in selecting a college were studied with a random sample of 768 freshmen admitted to the University of California (UC), Davis, in fall 1984. Major findings are: freshmen admitted to UC Davis had considerable breadth of knowledge about many other colleges and academic programs; over 80 percent applied to colleges besides UC Davis;…

  13. 76 FR 49664 - Safety Zone; M/V DAVY CROCKETT, Columbia River

    Federal Register 2010, 2011, 2012, 2013, 2014

    2011-08-11

    ... SECURITY Coast Guard 33 CFR Part 165 RIN 1625-AA00 Safety Zone; M/V DAVY CROCKETT, Columbia River AGENCY... enforcement of a safety zone established on the waters of the Columbia River surrounding the M/ V DAVY... hazards associated with ongoing salvage operations involving the M/ V DAVY CROCKETT. All persons...

  14. 76 FR 34862 - Safety Zone; M/V DAVY CROCKETT, Columbia River

    Federal Register 2010, 2011, 2012, 2013, 2014

    2011-06-15

    ... SECURITY Coast Guard 33 CFR Part 165 RIN 1625-AA00 Safety Zone; M/V DAVY CROCKETT, Columbia River AGENCY... enforcement of a safety zone established on the waters of the Columbia River surrounding the M/ V DAVY... hazards associated with ongoing salvage operations involving the M/ V DAVY CROCKETT. All persons...

  15. 75 FR 70200 - Davy Crockett National Forest Resource Advisory Committee; Public Meeting

    Federal Register 2010, 2011, 2012, 2013, 2014

    2010-11-17

    ... Davy Crockett National Forest Resource Advisory Committee; Public Meeting AGENCY: Forest Service... Committee Act of 1972 (FACA), the U.S. Department of Agriculture, Forest ] Service, Davy Crockett National Forest Resource Advisory Committee (RAC) meeting will meet as indicated below. DATES: The Davy Crockett...

  16. 48 CFR 52.222-5 - Davis-Bacon Act-Secondary Site of the Work.

    Code of Federal Regulations, 2010 CFR

    2010-10-01

    ... 48 Federal Acquisition Regulations System 2 2010-10-01 2010-10-01 false Davis-Bacon Act-Secondary... Clauses 52.222-5 Davis-Bacon Act—Secondary Site of the Work. As prescribed in 22.407(h), insert the following provision: Davis-Bacon Act—Secondary Site of the Work (JUL 2005) (a)(1) The offeror shall...

  17. 10 CFR 455.112 - Davis-Bacon wage rate requirement.

    Code of Federal Regulations, 2011 CFR

    2011-01-01

    ... 10 Energy 3 2011-01-01 2011-01-01 false Davis-Bacon wage rate requirement. 455.112 Section 455.112... Institutions and Coordinating Agencies § 455.112 Davis-Bacon wage rate requirement. When an energy conservation... wage rates determined by the Secretary of Labor in accordance with the Davis-Bacon Act (40 U.S.C....

  18. 40 CFR 35.935-5 - Davis-Bacon and related statutes.

    Code of Federal Regulations, 2013 CFR

    2013-07-01

    ... 40 Protection of Environment 1 2013-07-01 2013-07-01 false Davis-Bacon and related statutes. 35... § 35.935-5 Davis-Bacon and related statutes. Before soliciting bids or proposals for step 3-type work, the grantee must consult with the Regional Administrator concerning compliance with Davis-Bacon...

  19. 40 CFR 35.935-5 - Davis-Bacon and related statutes.

    Code of Federal Regulations, 2011 CFR

    2011-07-01

    ... 40 Protection of Environment 1 2011-07-01 2011-07-01 false Davis-Bacon and related statutes. 35... § 35.935-5 Davis-Bacon and related statutes. Before soliciting bids or proposals for step 3-type work, the grantee must consult with the Regional Administrator concerning compliance with Davis-Bacon...

  20. 24 CFR 906.37 - Davis-Bacon and HUD wage rate requirements.

    Code of Federal Regulations, 2010 CFR

    2010-04-01

    ... 24 Housing and Urban Development 4 2010-04-01 2010-04-01 false Davis-Bacon and HUD wage rate... URBAN DEVELOPMENT PUBLIC HOUSING HOMEOWNERSHIP PROGRAMS Program Administration § 906.37 Davis-Bacon and... by the PHA, pursuant to § 906.7. Davis-Bacon or HUD-determined wage rates apply as follows:...

  1. 40 CFR 35.935-5 - Davis-Bacon and related statutes.

    Code of Federal Regulations, 2012 CFR

    2012-07-01

    ... 40 Protection of Environment 1 2012-07-01 2012-07-01 false Davis-Bacon and related statutes. 35... § 35.935-5 Davis-Bacon and related statutes. Before soliciting bids or proposals for step 3-type work, the grantee must consult with the Regional Administrator concerning compliance with Davis-Bacon...

  2. 48 CFR 52.222-5 - Davis-Bacon Act-Secondary Site of the Work.

    Code of Federal Regulations, 2012 CFR

    2012-10-01

    ... 48 Federal Acquisition Regulations System 2 2012-10-01 2012-10-01 false Davis-Bacon Act-Secondary... Clauses 52.222-5 Davis-Bacon Act—Secondary Site of the Work. As prescribed in 22.407(h), insert the following provision: Davis-Bacon Act—Secondary Site of the Work (JUL 2005) (a)(1) The offeror shall...

  3. 48 CFR 52.222-31 - Davis-Bacon Act-Price Adjustment (Percentage Method).

    Code of Federal Regulations, 2013 CFR

    2013-10-01

    ... 48 Federal Acquisition Regulations System 2 2013-10-01 2013-10-01 false Davis-Bacon Act-Price... Provisions and Clauses 52.222-31 Davis-Bacon Act—Price Adjustment (Percentage Method). As prescribed in 22.407(f), insert the following clause: Davis-Bacon Act—Price Adjustment (Percentage Method) (DEC...

  4. 76 FR 76438 - Agency Information Collection Activities; Submission for OMB Review; Comment Request; Davis-Bacon...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2011-12-07

    ...; Davis-Bacon Certified Payroll ACTION: Notice. SUMMARY: The Department of Labor (DOL) is submitting the Wage and Hour Division (WHD) sponsored information collection request (ICR) titled, ``Davis-Bacon... mechanic has been paid not less than the proper Davis-Bacon prevailing wage rate for the work performed....

  5. 24 CFR 906.37 - Davis-Bacon and HUD wage rate requirements.

    Code of Federal Regulations, 2013 CFR

    2013-04-01

    ... 24 Housing and Urban Development 4 2013-04-01 2013-04-01 false Davis-Bacon and HUD wage rate... URBAN DEVELOPMENT PUBLIC HOUSING HOMEOWNERSHIP PROGRAMS Program Administration § 906.37 Davis-Bacon and... by the PHA, pursuant to § 906.7. Davis-Bacon or HUD-determined wage rates apply as follows:...

  6. 24 CFR 906.37 - Davis-Bacon and HUD wage rate requirements.

    Code of Federal Regulations, 2014 CFR

    2014-04-01

    ... 24 Housing and Urban Development 4 2014-04-01 2014-04-01 false Davis-Bacon and HUD wage rate... URBAN DEVELOPMENT PUBLIC HOUSING HOMEOWNERSHIP PROGRAMS Program Administration § 906.37 Davis-Bacon and... by the PHA, pursuant to § 906.7. Davis-Bacon or HUD-determined wage rates apply as follows:...

  7. 24 CFR 906.37 - Davis-Bacon and HUD wage rate requirements.

    Code of Federal Regulations, 2011 CFR

    2011-04-01

    ... 24 Housing and Urban Development 4 2011-04-01 2011-04-01 false Davis-Bacon and HUD wage rate... URBAN DEVELOPMENT PUBLIC HOUSING HOMEOWNERSHIP PROGRAMS Program Administration § 906.37 Davis-Bacon and... by the PHA, pursuant to § 906.7. Davis-Bacon or HUD-determined wage rates apply as follows:...

  8. 10 CFR 455.112 - Davis-Bacon wage rate requirement.

    Code of Federal Regulations, 2012 CFR

    2012-01-01

    ... 10 Energy 3 2012-01-01 2012-01-01 false Davis-Bacon wage rate requirement. 455.112 Section 455.112... Institutions and Coordinating Agencies § 455.112 Davis-Bacon wage rate requirement. When an energy conservation... wage rates determined by the Secretary of Labor in accordance with the Davis-Bacon Act (40 U.S.C....

  9. 40 CFR 35.935-5 - Davis-Bacon and related statutes.

    Code of Federal Regulations, 2010 CFR

    2010-07-01

    ... 40 Protection of Environment 1 2010-07-01 2010-07-01 false Davis-Bacon and related statutes. 35... § 35.935-5 Davis-Bacon and related statutes. Before soliciting bids or proposals for step 3-type work, the grantee must consult with the Regional Administrator concerning compliance with Davis-Bacon...

  10. 40 CFR 35.935-5 - Davis-Bacon and related statutes.

    Code of Federal Regulations, 2014 CFR

    2014-07-01

    ... 40 Protection of Environment 1 2014-07-01 2014-07-01 false Davis-Bacon and related statutes. 35... § 35.935-5 Davis-Bacon and related statutes. Before soliciting bids or proposals for step 3-type work, the grantee must consult with the Regional Administrator concerning compliance with Davis-Bacon...

  11. 10 CFR 455.112 - Davis-Bacon wage rate requirement.

    Code of Federal Regulations, 2014 CFR

    2014-01-01

    ... 10 Energy 3 2014-01-01 2014-01-01 false Davis-Bacon wage rate requirement. 455.112 Section 455.112... Institutions and Coordinating Agencies § 455.112 Davis-Bacon wage rate requirement. When an energy conservation... wage rates determined by the Secretary of Labor in accordance with the Davis-Bacon Act (40 U.S.C....

  12. 48 CFR 52.222-5 - Davis-Bacon Act-Secondary Site of the Work.

    Code of Federal Regulations, 2011 CFR

    2011-10-01

    ... 48 Federal Acquisition Regulations System 2 2011-10-01 2011-10-01 false Davis-Bacon Act-Secondary... Clauses 52.222-5 Davis-Bacon Act—Secondary Site of the Work. As prescribed in 22.407(h), insert the following provision: Davis-Bacon Act—Secondary Site of the Work (JUL 2005) (a)(1) The offeror shall...

  13. 24 CFR 906.37 - Davis-Bacon and HUD wage rate requirements.

    Code of Federal Regulations, 2012 CFR

    2012-04-01

    ... 24 Housing and Urban Development 4 2012-04-01 2012-04-01 false Davis-Bacon and HUD wage rate... URBAN DEVELOPMENT PUBLIC HOUSING HOMEOWNERSHIP PROGRAMS Program Administration § 906.37 Davis-Bacon and... by the PHA, pursuant to § 906.7. Davis-Bacon or HUD-determined wage rates apply as follows:...

  14. 48 CFR 52.222-5 - Davis-Bacon Act-Secondary Site of the Work.

    Code of Federal Regulations, 2013 CFR

    2013-10-01

    ... 48 Federal Acquisition Regulations System 2 2013-10-01 2013-10-01 false Davis-Bacon Act-Secondary... Clauses 52.222-5 Davis-Bacon Act—Secondary Site of the Work. As prescribed in 22.407(h), insert the following provision: Davis-Bacon Act—Secondary Site of the Work (JUL 2005) (a)(1) The offeror shall...

  15. 10 CFR 455.112 - Davis-Bacon wage rate requirement.

    Code of Federal Regulations, 2010 CFR

    2010-01-01

    ... 10 Energy 3 2010-01-01 2010-01-01 false Davis-Bacon wage rate requirement. 455.112 Section 455.112... Institutions and Coordinating Agencies § 455.112 Davis-Bacon wage rate requirement. When an energy conservation... wage rates determined by the Secretary of Labor in accordance with the Davis-Bacon Act (40 U.S.C....

  16. 10 CFR 455.112 - Davis-Bacon wage rate requirement.

    Code of Federal Regulations, 2013 CFR

    2013-01-01

    ... 10 Energy 3 2013-01-01 2013-01-01 false Davis-Bacon wage rate requirement. 455.112 Section 455.112... Institutions and Coordinating Agencies § 455.112 Davis-Bacon wage rate requirement. When an energy conservation... wage rates determined by the Secretary of Labor in accordance with the Davis-Bacon Act (40 U.S.C....

  17. The Summer Mesopause Region at Davis, Antarctica 2010 - 2012

    NASA Astrophysics Data System (ADS)

    Höffner, J.

    2014-12-01

    In cooperation with the Australian Antarctic Division mesopause temperatures, iron densities and NLC were measured at Davis, 69°S by the mobile Fe-Doppler-Lidar of the IAP. Within 2 years more than 2900 hours of observations have been obtained throughout the season. We will present quasi-continuous measurements of temperature profiles in the southern hemisphere mesopause region during the transition from winter to summer in 2011/2012. In a period of 120 days around solstice we have performed lidar observations for a total of 736 hours. PMSE was simultaneously observed by the nearby Davis-MST Radar. The winter/summer transition is identified by a downward shift of the mesopause which occurs on 8 November 2011. Soon after transition, mesopause heights and temperatures are similar to the northern hemisphere (NH) colatitude summer (88 km, 130 K). Around solstice the Mesopause is elevated for several days by 4-5 km and is colder than typical NH temperatures by 10 K. In this period individual profiles show temperatures as low as 100 K. The occurrence of polar mesosphere summer echoes is closely connected to low temperatures. Below 88 to 90 km and in the main summer season of 2011/2012 temperatures at Davis are generally warmer compared to the NH by 5-15 K, whereas temperatures are generally colder above 90 km. The first NLC observed by the lidar occurred very late in the season close to solstice. Most NLC occurred during a period of comparable warm temperatures and high iron number densities in early January. The late occurrence is in agreement with long term observations by the Davis-Lidar (AAD). The late occurrence is a major difference compared to the co-latitude Andoya, 69° N.

  18. Telehealth at UC Davis--a 20-year experience.

    PubMed

    Nesbitt, Thomas S; Dharmar, Madan; Katz-Bell, Jana; Hartvigsen, Gunnar; Marcin, James P

    2013-05-01

    Telehealth at the University of California Health System began as a telefetal monitoring connection with a rural hospital in 1992 and evolved to become the Center for Health and Technology (CHT) in 2000. The Center supports the vision of the University of California Davis (UC Davis) Health System-a healthier world through bold innovation. The CHT focuses on the four pillars of the academic health center: clinical services, research and scholarly work, education, and public service. Since 1996, the Center has provided more than 33,000 telemedicine consultation (excluding teleradiology, telepathology, and phone consultations) in over 30 clinical specialties and at more than 90 locations across California. Research and continuous evaluation have played an integral role in shaping the telehealth program, as well as strategic collaborations and partnerships. In an effort to expand the field of telehealth the CHT provides telehealth training for health professionals, technical specialists, and administrators. Furthermore, it also plays an integral role in workforce development through the education of the next generation of community primary care physicians through Rural Programs In Medical Education (Rural PRIME) and continuing educational programs for working health professionals through videoconferencing and Web-based modalities. The Center is supported through a variety of funding sources, and its sustainability comes from a mix of fee-for-service payment, contracts, grants, gifts, and institutional funding. Together with key partners, UC Davis has educated and informed initiatives resulting in legislation and policies that advance telehealth. Looking toward the future, UC Davis is focused on technology-enabled healthcare and supporting synergy among electronic health records, health information exchange, mobile health, informatics, and telehealth.

  19. The eye disease of Jefferson Davis (1808-1889).

    PubMed

    Hertle, Richard W; Spellman, Robert

    2006-01-01

    The only Confederate president, Jefferson Davis, led a long and eventful life. He was a Mississippi planter, a husband, a father, West Point graduate, war hero, congressman, senator, secretary of war, and finally President of the Confederate States of America. In many ways he was a study of contrast with his northern counterpart, Abraham Lincoln. Davis was personally courageous and a rich, educated, southern aristocrat who did not deeply understand the political process or have the refined personal skills necessary to work well with others. Prior to his Presidency he served with distinction in two wars, but as a result of his confederate activity and pro-slavery philosophy he is one of the least discussed famous Americans. Davis's health was a constant problem and he suffered an almost fatal attack of "malaria" in 1836. In the winter of 1857-1858 he again was seriously ill and by the end of February 1858 a chronic, relapsing, ocular inflammatory condition began. Using historical evidence from multiple sources, this paper will propose a diagnosis of the Confederate President's ocular condition and consider how this could have influenced his military and political decisions.

  20. The eye disease of Jefferson Davis (1808-1889).

    PubMed

    Hertle, Richard W; Spellman, Robert

    2007-01-01

    The only Confederate president, Jefferson Davis, led a long and eventful life. He was a Mississippi planter, a husband, a father, West Point graduate, war hero, congressman, senator, secretary of war, and finally President of the Confederate States of America. In many ways he was a study of contrast with his northern counterpart Abraham Lincoln. Davis was personally courageous and a rich, educated, southern aristocrat who did not deeply understand the political process or have the refined personal skills necessary to work well with others. Prior to his Presidency he served with distinction in two wars, but as a result of his confederate activity and pro-slavery philosophy he is one of the least discussed famous Americans. Davis's health was a constant problem and he suffered an almost fatal attack of 'malaria' in 1836. In the winter of 1857-1858, he again was seriously ill and by the end of February 1858, a chronic, relapsing, ocular inflammatory condition began. Using historical evidence from multiple sources, this paper will propose a diagnosis of the Confederate President's ocular condition and consider how this could have influenced his military and political decisions.

  1. Fast Reactors

    NASA Astrophysics Data System (ADS)

    Esposito, S.; Pisanti, O.

    The following sections are included: * Elementary Considerations * The Integral Equation to the Neutron Distribution * The Critical Size for a Fast Reactor * Supercritical Reactors * Problems and Exercises

  2. NEUTRONIC REACTOR

    DOEpatents

    Fermi, E.; Zinn, W.H.; Anderson, H.L.

    1958-09-16

    Means are presenied for increasing the reproduction ratio of a gaphite- moderated neutronic reactor by diminishing the neutron loss due to absorption or capture by gaseous impurities within the reactor. This means comprised of a fluid-tight casing or envelope completely enclosing the reactor and provided with a valve through which the casing, and thereby the reactor, may be evacuated of atmospheric air.

  3. Solar pond power plant feasibility study for Davis, California

    NASA Technical Reports Server (NTRS)

    Wu, Y. C.; Singer, M. J.; Marsh, H. E.; Harris, J.; Walton, A. L.

    1982-01-01

    The feasibility of constructing a solar pond power plant at Davis, California was studied. Site visits, weather data compilation, soil and water analyses, conceptual system design and analyses, a material and equipment market survey, conceptual site layout, and a preliminary cost estimate were studied. It was concluded that a solar pond power plant is technically feasible, but economically unattractive. The relatively small scale of the proposed plant and the high cost of importing salt resulted in a disproportionately high capital investment with respect to the annual energy production capacity of the plant. Cycle optimization and increased plant size would increase the economical attractiveness of the proposed concept.

  4. Antarctic meteor observations using the Davis MST and meteor radars

    NASA Astrophysics Data System (ADS)

    Holdsworth, David A.; Murphy, Damian J.; Reid, Iain M.; Morris, Ray J.

    2008-07-01

    This paper presents the meteor observations obtained using two radars installed at Davis (68.6°S, 78.0°E), Antarctica. The Davis MST radar was installed primarily for observation of polar mesosphere summer echoes, with additional transmit and receive antennas installed to allow all-sky interferometric meteor radar observations. The Davis meteor radar performs dedicated all-sky interferometric meteor radar observations. The annual count rate variation for both radars peaks in mid-summer and minimizes in early Spring. The height distribution shows significant annual variation, with minimum (maximum) peak heights and maximum (minimum) height widths in early Spring (mid-summer). Although the meteor radar count rate and height distribution variations are consistent with a similar frequency meteor radar operating at Andenes (69.3°N), the peak heights show a much larger variation than at Andenes, while the count rate maximum-to-minimum ratios show a much smaller variation. Investigation of the effects of the temporal sampling parameters suggests that these differences are consistent with the different temporal sampling strategies used by the Davis and Andenes meteor radars. The new radiant mapping procedure of [Jones, J., Jones, W., Meteor radiant activity mapping using single-station radar observations, Mon. Not. R. Astron. Soc., 367(3), 1050-1056, doi: 10.1111/j.1365-2966.2006.10025.x, 2006] is investigated. The technique is used to detect the Southern delta-Aquarid meteor shower, and a previously unknown weak shower. Meteoroid speeds obtained using the Fresnel transform are presented. The diurnal, annual, and height variation of meteoroid speeds are presented, with the results found to be consistent with those obtained using specular meteor radars. Meteoroid speed estimates for echoes identified as Southern delta-Aquarid and Sextantid meteor candidates show good agreement with the theoretical pre-atmospheric speeds of these showers (41 km s -1 and 32 km s -1

  5. The Aging of a Great Woman from Florida: Wilma E. Davis

    ERIC Educational Resources Information Center

    Lumadue, Richard

    2011-01-01

    This paper deals with aging of a remarkable woman from Florida, Wilma E. Davis. After ministering in the Methodist church for over 30 years as the first ordained Methodist minister in the state of Florida, Davis retired and began a PhD program at Boston University at the age of 63. Davis completed her PhD at the age of 68. The pursuit of her…

  6. The Aging of a Great Woman from Florida: Wilma E. Davis

    ERIC Educational Resources Information Center

    Lumadue, Richard

    2011-01-01

    This paper deals with aging of a remarkable woman from Florida, Wilma E. Davis. After ministering in the Methodist church for over 30 years as the first ordained Methodist minister in the state of Florida, Davis retired and began a PhD program at Boston University at the age of 63. Davis completed her PhD at the age of 68. The pursuit of her…

  7. Humphry Davy and the Royal Institution of Great Britain.

    PubMed

    Unwin, Patrick R; Unwin, Robert W

    2009-03-20

    The abortive attempts of Sir Humphry Davy to introduce modest reforms at the Royal Society of London during his Presidency (1820-27) contrast with his (largely unstudied) earlier experience of administration at the Royal Institution of Great Britain (RI). Davy's attempts to combat the systemic weaknesses in governance and funding, and his role in effecting changes at the RI, in association with a core group of reformers, merit consideration. This paper analyses important aspects of the early management and social structure of the RI and examines the inner workings of the institution. It shows how and why the Library, its most valuable financial asset, and its celebrated Laboratory, developed along distinctive lines, each with its own support structures and intra-institutional interests. While acknowledging the roles traditionally ascribed to Count Rumford and Sir Joseph Banks, the paper highlights the contributions of other early patrons such as Thomas Bernard, son of a colonial governor of Massachusetts, and Earl Spencer, a leading European bibliophile and RI President from 1813 to 1825. The promotion of a Bill in Parliament in 1810, designed to transform the RI from a proprietary body politic into a corporation of members, and the subsequent framing of the bye-laws, provided opportunities to establish a more democratic structure of elected committees for the conduct of science.

  8. [Sir Humphry Davy, the discoverer of anesthetic action of nitrous oxide--Davy and poets of British Romanticism and inhalation of laughing gas by his friends].

    PubMed

    Fujita, T

    1998-01-01

    In "Dove Cottage", the old house of the poet laureate William Wordsworth (1770-1850) in Grasmere, England, there is a portrait of Sir Humphry Davy (1778-1829). In 1804, Wordsworth invited his young friend to his home. Davy's works in the field of chemistry are well known. Interestingly enough, once he wished he could be a poet. His future seemed to be prosperous and delightful. He was highly evaluated by Robert Southey, poet laureate. But he has chosen the way of chemist. The author found some facts from literatures and received some information by courtesy of the Wordsworth Trust, Centre for British Romanticism. Davy's life and his works were introduced chronologically.

  9. BOILING REACTORS

    DOEpatents

    Untermyer, S.

    1962-04-10

    A boiling reactor having a reactivity which is reduced by an increase in the volume of vaporized coolant therein is described. In this system unvaporized liquid coolant is extracted from the reactor, heat is extracted therefrom, and it is returned to the reactor as sub-cooled liquid coolant. This reduces a portion of the coolant which includes vaporized coolant within the core assembly thereby enhancing the power output of the assembly and rendering the reactor substantially self-regulating. (AEC)

  10. NEUTRONIC REACTOR

    DOEpatents

    Daniels, F.

    1959-10-27

    A reactor in which at least a portion of the moderator is in the form of movable refractory balls is described. In addition to their moderating capacity, these balls may serve as carriers for fissionable material or fertile material, or may serve in a coolant capacity to remove heat from the reactor. A pneumatic system is used to circulate the balls through the reactor.

  11. NUCLEAR REACTOR

    DOEpatents

    Treshow, M.

    1961-09-01

    A boiling-water nuclear reactor is described wherein control is effected by varying the moderator-to-fuel ratio in the reactor core. This is accomplished by providing control tubes containing a liquid control moderator in the reactor core and providing means for varying the amount of control moderatcr within the control tubes.

  12. Charles Davies Sherborn and the “Indexer’s Club”

    PubMed Central

    Evenhuis, Neal L.

    2016-01-01

    Abstract The first few words of the title of this symposium are “Anchoring Biodiversity Information”. In order to properly anchor anything for a long-lasting future, a solid foundation needs to have been laid. For the zoological portion of biodiversity information, that firm foundation is best exemplified in the works of Charles Davies Sherborn. This man, like others of his ilk, was intimately focused on indexing names. This incredible focus was a life-long passion for him and culminated in his 9500-page Index Animalium of over 400,000 names of animals. This Index represents not only one of the most prodigious efforts in publication by a single man and the single most important reference to names in zoology, but a permanent legacy to the efforts of an indexer that proved to be an inspiration to many. PMID:26877650

  13. 77 FR 29982 - Federal Acquisition Regulation; Submission for OMB Review; Davis Bacon Act-Price Adjustment...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2012-05-21

    ... Regulation; Submission for OMB Review; Davis Bacon Act-Price Adjustment (Actual Method) AGENCY: Department of... previously approved information collection requirement concerning the Davis-Bacon Act price adjustment... Bacon Act-Price Adjustment (Actual Method), by any of the following methods: Regulations.gov : http...

  14. New Leaders for Troubled Schools: Jacquelyn Davis Works with D.C.'s Education Bureaucracy

    ERIC Educational Resources Information Center

    Currie, Tyler

    2007-01-01

    In this article the author presents Jacquelyn Davis, the executive director of the Washington office of New Leaders for New Schools (NLNS), a nonprofit dedicated to training recruits drawn from a range of sectors for leadership in failing school systems. Davis is overseeing a rapidly expanding crop of new principals who are promising to revitalize…

  15. The Graduates of 1983 and 1973: Their Postgraduate Studies, Occupations, and Impressions of UC Davis.

    ERIC Educational Resources Information Center

    Hunziker, Celeste M.

    Postgraduate education, employment, and attitudes of 1973 and 1983 graduates of the University of California, Davis, (UC Davis) were surveyed in 1984. Responses were received from 60% of 1983 bachelor's degree recipients and 48% of 1973 graduates. Findings include: one-third of baccalaureate degree holders enrolled immediately in a postgraduate…

  16. TODAY: Hub City Humane Society Together with Chuck and Gayle Davis to Receive EPA Reuse Award

    EPA Pesticide Factsheets

    ATLANTA - Today, the U.S. Environmental Protection Agency (EPA) will present the Region 4 Excellence in Site Reuse Award to Chuck and Gayle Davis, property owners, and the Hub City Humane Society for redeveloping the Davis Timber Superfund site in H

  17. Group 12 ASCANs Davis and Jemison during zero gravity training aboard KC-135

    NASA Technical Reports Server (NTRS)

    1987-01-01

    Group 12, 1987 Astronaut Class, candidates (ASCANs) N. Jan Davis (left) and Mae C. Jemison freefloat during the seconds of microgravity created aboard the KC-135 NASA 930 aircraft's parabolic flight. Davis and Jemison two of the recently-named ASCANs take a familiarization flight aboard the KC-135 'zero gravity' aircraft.

  18. 75 FR 53694 - Florida Petroleum Reprocessors Superfund Site; Davie, Broward County, FL; Notice of Settlement

    Federal Register 2010, 2011, 2012, 2013, 2014

    2010-09-01

    ...] Florida Petroleum Reprocessors Superfund Site; Davie, Broward County, FL; Notice of Settlement AGENCY... Florida Petroleum Reprocessors Superfund Site located in Davie, Broward County, Florida for publication..., identified by Docket ID No. EPA-RO4- SFUND-2010-0729 or Site name Florida Petroleum Reprocessors...

  19. 76 FR 18397 - Safety Zones; M/V Davy Crockett, Columbia and Willamette Rivers

    Federal Register 2010, 2011, 2012, 2013, 2014

    2011-04-04

    ... Rivers AGENCY: Coast Guard, DHS. ACTION: Temporary final rule. SUMMARY: The U.S. Coast Guard is extending... Willamette Rivers surrounding the M/V DAVY CROCKETT. The Coast Guard is also reducing the size of the stationary emergency safety zone surrounding the M/V DAVY CROCKETT at approximately river mile 117 on the...

  20. 76 FR 73511 - Safety Zone; M/V DAVY CROCKETT, Columbia River

    Federal Register 2010, 2011, 2012, 2013, 2014

    2011-11-29

    ... SECURITY Coast Guard 33 CFR Part 165 RIN 1625-AA00 Safety Zone; M/V DAVY CROCKETT, Columbia River AGENCY... enforcement period of a safety zone established on the waters of the Columbia River surrounding the remaining cofferdam at the M/V DAVY CROCKETT removal sight at approximate river mile 117. The original safety zone was...

  1. 76 FR 21253 - Safety Zone; M/V DAVY CROCKETT, Columbia River

    Federal Register 2010, 2011, 2012, 2013, 2014

    2011-04-15

    ... SECURITY Coast Guard 33 CFR Part 165 RIN 1625-AA00 Safety Zone; M/V DAVY CROCKETT, Columbia River AGENCY... the emergency safety zone established on the waters of the Columbia River surrounding the M/V DAVY CROCKETT at approximately river mile 117 on January 28, 2011. The safety zone is necessary to help ensure...

  2. 48 CFR 622.404 - Davis-Bacon Act wage determinations.

    Code of Federal Regulations, 2013 CFR

    2013-10-01

    ... 48 Federal Acquisition Regulations System 4 2013-10-01 2013-10-01 false Davis-Bacon Act wage determinations. 622.404 Section 622.404 Federal Acquisition Regulations System DEPARTMENT OF STATE SOCIOECONOMIC... Construction 622.404 Davis-Bacon Act wage determinations....

  3. 48 CFR 52.222-13 - Compliance with Davis-Bacon and Related Act Regulations.

    Code of Federal Regulations, 2013 CFR

    2013-10-01

    ...-Bacon and Related Act Regulations. 52.222-13 Section 52.222-13 Federal Acquisition Regulations System... Text of Provisions and Clauses 52.222-13 Compliance with Davis-Bacon and Related Act Regulations. As prescribed in 22.407(a), insert the following clause: Compliance With Davis-Bacon and Related Act...

  4. 48 CFR 1422.404 - Davis-Bacon Act wage determinations.

    Code of Federal Regulations, 2011 CFR

    2011-10-01

    ... 48 Federal Acquisition Regulations System 5 2011-10-01 2011-10-01 false Davis-Bacon Act wage determinations. 1422.404 Section 1422.404 Federal Acquisition Regulations System DEPARTMENT OF THE INTERIOR... Involving Construction 1422.404 Davis-Bacon Act wage determinations....

  5. 48 CFR 22.404 - Davis-Bacon Act wage determinations.

    Code of Federal Regulations, 2012 CFR

    2012-10-01

    ... 48 Federal Acquisition Regulations System 1 2012-10-01 2012-10-01 false Davis-Bacon Act wage determinations. 22.404 Section 22.404 Federal Acquisition Regulations System FEDERAL ACQUISITION REGULATION... Involving Construction 22.404 Davis-Bacon Act wage determinations. The Department of Labor is...

  6. 48 CFR 622.404 - Davis-Bacon Act wage determinations.

    Code of Federal Regulations, 2014 CFR

    2014-10-01

    ... 48 Federal Acquisition Regulations System 4 2014-10-01 2014-10-01 false Davis-Bacon Act wage determinations. 622.404 Section 622.404 Federal Acquisition Regulations System DEPARTMENT OF STATE SOCIOECONOMIC... Construction 622.404 Davis-Bacon Act wage determinations....

  7. 48 CFR 622.404 - Davis-Bacon Act wage determinations.

    Code of Federal Regulations, 2012 CFR

    2012-10-01

    ... 48 Federal Acquisition Regulations System 4 2012-10-01 2012-10-01 false Davis-Bacon Act wage determinations. 622.404 Section 622.404 Federal Acquisition Regulations System DEPARTMENT OF STATE SOCIOECONOMIC... Construction 622.404 Davis-Bacon Act wage determinations....

  8. 48 CFR 1422.404 - Davis-Bacon Act wage determinations.

    Code of Federal Regulations, 2013 CFR

    2013-10-01

    ... 48 Federal Acquisition Regulations System 5 2013-10-01 2013-10-01 false Davis-Bacon Act wage determinations. 1422.404 Section 1422.404 Federal Acquisition Regulations System DEPARTMENT OF THE INTERIOR... Involving Construction 1422.404 Davis-Bacon Act wage determinations....

  9. 48 CFR 1322.404 - Davis-Bacon Act wage determination.

    Code of Federal Regulations, 2010 CFR

    2010-10-01

    ... 48 Federal Acquisition Regulations System 5 2010-10-01 2010-10-01 false Davis-Bacon Act wage determination. 1322.404 Section 1322.404 Federal Acquisition Regulations System DEPARTMENT OF COMMERCE... Involving Construction 1322.404 Davis-Bacon Act wage determination....

  10. 46 CFR Sec. 14 - Anti-Kickback and Davis-Bacon Acts.

    Code of Federal Regulations, 2012 CFR

    2012-10-01

    ... 46 Shipping 8 2012-10-01 2012-10-01 false Anti-Kickback and Davis-Bacon Acts. Sec. 14 Section 14... Sec. 14 Anti-Kickback and Davis-Bacon Acts. (a) All work awarded under the NSA-LUMPSUMREP Contract is...-Bacon Act (except in those cases where the Invitations for Bids or job order state that the work...

  11. 48 CFR 422.404 - Davis-Bacon Act wage determinations.

    Code of Federal Regulations, 2010 CFR

    2010-10-01

    ... 48 Federal Acquisition Regulations System 4 2010-10-01 2010-10-01 false Davis-Bacon Act wage determinations. 422.404 Section 422.404 Federal Acquisition Regulations System DEPARTMENT OF AGRICULTURE... Involving Construction 422.404 Davis-Bacon Act wage determinations....

  12. 48 CFR 52.222-13 - Compliance with Davis-Bacon and Related Act Regulations.

    Code of Federal Regulations, 2012 CFR

    2012-10-01

    ...-Bacon and Related Act Regulations. 52.222-13 Section 52.222-13 Federal Acquisition Regulations System... Text of Provisions and Clauses 52.222-13 Compliance with Davis-Bacon and Related Act Regulations. As prescribed in 22.407(a), insert the following clause: Compliance With Davis-Bacon and Related Act...

  13. 48 CFR 1322.404 - Davis-Bacon Act wage determination.

    Code of Federal Regulations, 2012 CFR

    2012-10-01

    ... 48 Federal Acquisition Regulations System 5 2012-10-01 2012-10-01 false Davis-Bacon Act wage determination. 1322.404 Section 1322.404 Federal Acquisition Regulations System DEPARTMENT OF COMMERCE... Involving Construction 1322.404 Davis-Bacon Act wage determination....

  14. 48 CFR 1322.404 - Davis-Bacon Act wage determination.

    Code of Federal Regulations, 2014 CFR

    2014-10-01

    ... 48 Federal Acquisition Regulations System 5 2014-10-01 2014-10-01 false Davis-Bacon Act wage determination. 1322.404 Section 1322.404 Federal Acquisition Regulations System DEPARTMENT OF COMMERCE... Involving Construction 1322.404 Davis-Bacon Act wage determination....

  15. 48 CFR 222.404 - Davis-Bacon Act wage determinations.

    Code of Federal Regulations, 2011 CFR

    2011-10-01

    ... 48 Federal Acquisition Regulations System 3 2011-10-01 2011-10-01 false Davis-Bacon Act wage determinations. 222.404 Section 222.404 Federal Acquisition Regulations System DEFENSE ACQUISITION REGULATIONS... Labor Standards for Contracts Involving Construction 222.404 Davis-Bacon Act wage determinations....

  16. 48 CFR 52.222-13 - Compliance with Davis-Bacon and Related Act Regulations.

    Code of Federal Regulations, 2011 CFR

    2011-10-01

    ...-Bacon and Related Act Regulations. 52.222-13 Section 52.222-13 Federal Acquisition Regulations System... Text of Provisions and Clauses 52.222-13 Compliance with Davis-Bacon and Related Act Regulations. As prescribed in 22.407(a), insert the following clause: Compliance With Davis-Bacon and Related Act...

  17. 48 CFR 622.404 - Davis-Bacon Act wage determinations.

    Code of Federal Regulations, 2011 CFR

    2011-10-01

    ... 48 Federal Acquisition Regulations System 4 2011-10-01 2011-10-01 false Davis-Bacon Act wage determinations. 622.404 Section 622.404 Federal Acquisition Regulations System DEPARTMENT OF STATE SOCIOECONOMIC... Construction 622.404 Davis-Bacon Act wage determinations....

  18. 48 CFR 22.404 - Davis-Bacon Act wage determinations.

    Code of Federal Regulations, 2010 CFR

    2010-10-01

    ... 48 Federal Acquisition Regulations System 1 2010-10-01 2010-10-01 false Davis-Bacon Act wage determinations. 22.404 Section 22.404 Federal Acquisition Regulations System FEDERAL ACQUISITION REGULATION... Involving Construction 22.404 Davis-Bacon Act wage determinations. The Department of Labor is...

  19. 48 CFR 1322.404 - Davis-Bacon Act wage determination.

    Code of Federal Regulations, 2011 CFR

    2011-10-01

    ... 48 Federal Acquisition Regulations System 5 2011-10-01 2011-10-01 false Davis-Bacon Act wage determination. 1322.404 Section 1322.404 Federal Acquisition Regulations System DEPARTMENT OF COMMERCE... Involving Construction 1322.404 Davis-Bacon Act wage determination....

  20. 48 CFR 52.222-13 - Compliance with Davis-Bacon and Related Act Regulations.

    Code of Federal Regulations, 2010 CFR

    2010-10-01

    ...-Bacon and Related Act Regulations. 52.222-13 Section 52.222-13 Federal Acquisition Regulations System... Text of Provisions and Clauses 52.222-13 Compliance with Davis-Bacon and Related Act Regulations. As prescribed in 22.407(a), insert the following clause: Compliance With Davis-Bacon and Related Act...

  1. 48 CFR 22.404 - Davis-Bacon Act wage determinations.

    Code of Federal Regulations, 2013 CFR

    2013-10-01

    ... 48 Federal Acquisition Regulations System 1 2013-10-01 2013-10-01 false Davis-Bacon Act wage determinations. 22.404 Section 22.404 Federal Acquisition Regulations System FEDERAL ACQUISITION REGULATION... Involving Construction 22.404 Davis-Bacon Act wage determinations. The Department of Labor is...

  2. 48 CFR 422.404 - Davis-Bacon Act wage determinations.

    Code of Federal Regulations, 2013 CFR

    2013-10-01

    ... 48 Federal Acquisition Regulations System 4 2013-10-01 2013-10-01 false Davis-Bacon Act wage determinations. 422.404 Section 422.404 Federal Acquisition Regulations System DEPARTMENT OF AGRICULTURE... Involving Construction 422.404 Davis-Bacon Act wage determinations....

  3. 48 CFR 1422.404 - Davis-Bacon Act wage determinations.

    Code of Federal Regulations, 2012 CFR

    2012-10-01

    ... 48 Federal Acquisition Regulations System 5 2012-10-01 2012-10-01 false Davis-Bacon Act wage determinations. 1422.404 Section 1422.404 Federal Acquisition Regulations System DEPARTMENT OF THE INTERIOR... Involving Construction 1422.404 Davis-Bacon Act wage determinations....

  4. 48 CFR 622.404 - Davis-Bacon Act wage determinations.

    Code of Federal Regulations, 2010 CFR

    2010-10-01

    ... 48 Federal Acquisition Regulations System 4 2010-10-01 2010-10-01 false Davis-Bacon Act wage determinations. 622.404 Section 622.404 Federal Acquisition Regulations System DEPARTMENT OF STATE SOCIOECONOMIC... Construction 622.404 Davis-Bacon Act wage determinations....

  5. 48 CFR 422.404 - Davis-Bacon Act wage determinations.

    Code of Federal Regulations, 2014 CFR

    2014-10-01

    ... 48 Federal Acquisition Regulations System 4 2014-10-01 2014-10-01 false Davis-Bacon Act wage determinations. 422.404 Section 422.404 Federal Acquisition Regulations System DEPARTMENT OF AGRICULTURE... Involving Construction 422.404 Davis-Bacon Act wage determinations....

  6. 48 CFR 1422.404 - Davis-Bacon Act wage determinations.

    Code of Federal Regulations, 2010 CFR

    2010-10-01

    ... 48 Federal Acquisition Regulations System 5 2010-10-01 2010-10-01 false Davis-Bacon Act wage determinations. 1422.404 Section 1422.404 Federal Acquisition Regulations System DEPARTMENT OF THE INTERIOR... Involving Construction 1422.404 Davis-Bacon Act wage determinations....

  7. 48 CFR 1322.404 - Davis-Bacon Act wage determination.

    Code of Federal Regulations, 2013 CFR

    2013-10-01

    ... 48 Federal Acquisition Regulations System 5 2013-10-01 2013-10-01 false Davis-Bacon Act wage determination. 1322.404 Section 1322.404 Federal Acquisition Regulations System DEPARTMENT OF COMMERCE... Involving Construction 1322.404 Davis-Bacon Act wage determination....

  8. 48 CFR 22.404 - Davis-Bacon Act wage determinations.

    Code of Federal Regulations, 2011 CFR

    2011-10-01

    ... 48 Federal Acquisition Regulations System 1 2011-10-01 2011-10-01 false Davis-Bacon Act wage determinations. 22.404 Section 22.404 Federal Acquisition Regulations System FEDERAL ACQUISITION REGULATION... Involving Construction 22.404 Davis-Bacon Act wage determinations. The Department of Labor is...

  9. 46 CFR Sec. 14 - Anti-Kickback and Davis-Bacon Acts.

    Code of Federal Regulations, 2010 CFR

    2010-10-01

    ... 46 Shipping 8 2010-10-01 2010-10-01 false Anti-Kickback and Davis-Bacon Acts. Sec. 14 Section 14... Sec. 14 Anti-Kickback and Davis-Bacon Acts. (a) All work awarded under the NSA-LUMPSUMREP Contract is...-Bacon Act (except in those cases where the Invitations for Bids or job order state that the work...

  10. 48 CFR 422.404 - Davis-Bacon Act wage determinations.

    Code of Federal Regulations, 2011 CFR

    2011-10-01

    ... 48 Federal Acquisition Regulations System 4 2011-10-01 2011-10-01 false Davis-Bacon Act wage determinations. 422.404 Section 422.404 Federal Acquisition Regulations System DEPARTMENT OF AGRICULTURE... Involving Construction 422.404 Davis-Bacon Act wage determinations....

  11. 48 CFR 222.404 - Davis-Bacon Act wage determinations.

    Code of Federal Regulations, 2010 CFR

    2010-10-01

    ... 48 Federal Acquisition Regulations System 3 2010-10-01 2010-10-01 false Davis-Bacon Act wage determinations. 222.404 Section 222.404 Federal Acquisition Regulations System DEFENSE ACQUISITION REGULATIONS... Labor Standards for Contracts Involving Construction 222.404 Davis-Bacon Act wage determinations....

  12. 48 CFR 1422.404 - Davis-Bacon Act wage determinations.

    Code of Federal Regulations, 2014 CFR

    2014-10-01

    ... 48 Federal Acquisition Regulations System 5 2014-10-01 2014-10-01 false Davis-Bacon Act wage determinations. 1422.404 Section 1422.404 Federal Acquisition Regulations System DEPARTMENT OF THE INTERIOR... Involving Construction 1422.404 Davis-Bacon Act wage determinations....

  13. 48 CFR 422.404 - Davis-Bacon Act wage determinations.

    Code of Federal Regulations, 2012 CFR

    2012-10-01

    ... 48 Federal Acquisition Regulations System 4 2012-10-01 2012-10-01 false Davis-Bacon Act wage determinations. 422.404 Section 422.404 Federal Acquisition Regulations System DEPARTMENT OF AGRICULTURE... Involving Construction 422.404 Davis-Bacon Act wage determinations....

  14. Linking academic and clinical missions: UC Davis' integrated AHC.

    PubMed

    Pomeroy, Claire; Rice, Ann; McGowan, William; Osburn, Nathan

    2008-09-01

    Academic health centers (AHCs) rely on cross-subsidization of education and research programs by the clinical enterprise, but this is becoming more challenging as clinical reimbursements decline. These new realities provide an important opportunity to reevaluate the relationships between medical schools and academic medical centers. The authors examine the benefits of their ongoing commitment to create a fully integrated AHC at the University of California (UC) Davis, discussing strategies that serve as catalysts for continued growth. They explore how investments of proceeds from the clinical enterprise directly enhance educational and research initiatives, which, in turn, increase the success of patient-care programs. This has created a cycle of excellence that leads to an enhanced reputation for the entire health system. One strategy involves using clinical margins to "prime the pump" in anticipation of major research initiatives, resulting in rapid increases in external research funding and academic recognition. In turn, this facilitates recruitment of high-quality faculty and staff, improving the ability to deliver expert clinical care. The overall enhanced institutional reputation positions both the clinical and academic programs for further success. The authors posit that such approaches require executive-level commitment to a single strategic vision, unified leadership, and collaborative financial and operational decision making. Adopting such changes is not without challenges, which are discussed, but the authors suggest that an integrated AHC fosters optimized operations, enhanced reputation, and stronger performance across all mission areas. They also provide examples of how the UC Davis Health System has thus attracted philanthropists and investments from the private sector.

  15. Design constraints on Cherenkov telescopes with Davies-Cotton reflectors

    NASA Astrophysics Data System (ADS)

    Bretz, T.; Ribordy, M.

    2013-05-01

    This paper discusses the construction of high-performance ground-based gamma-ray Cherenkov telescopes with a Davies-Cotton reflector. For the design of such telescopes, usually physics constrains the field-of-view, while the photo-sensor size is defined by limited options. Including the effect of light-concentrators, it is demonstrated that these constraints are enough to mutually constrain all other design parameters. The dependability of the various design parameters naturally arises once a relationship between the value of the point-spread functions at the edge of the field-of-view and the pixel field-of-view is introduced. To be able to include this constraint into a system of equations, an analytical description for the point-spread function of a tessellated Davies-Cotton reflector is derived from Taylor developments and ray-tracing simulations. Including higher order terms renders the result precise on the percent level. Design curves are provided within the typical phase space of Cherenkov telescopes. The impact of all design parameters on the overall design is discussed. Allowing an immediate comparison of several options with identical physics performance allows the determination of the most cost efficient solution. Emphasis is given on the possible application of solid light concentrators with their typically about two times better concentration compared with hollow cones which allows the use of small photo sensors such as Geiger-mode avalanche photo diodes. This is discussed in more details in the context of possible design options for the Cherenkov Telescope Array. In particular, a solution for a 60 mm2 photo sensor with hollow cone is compared to a 36 mm2 with solid cone.

  16. CONVECTION REACTOR

    DOEpatents

    Hammond, R.P.; King, L.D.P.

    1960-03-22

    An homogeneous nuclear power reactor utilizing convection circulation of the liquid fuel is proposed. The reactor has an internal heat exchanger looated in the same pressure vessel as the critical assembly, thereby eliminating necessity for handling the hot liquid fuel outside the reactor pressure vessel during normal operation. The liquid fuel used in this reactor eliminates the necessity for extensive radiolytic gas rocombination apparatus, and the reactor is resiliently pressurized and, without any movable mechanical apparatus, automatically regulates itself to the condition of criticality during moderate variations in temperature snd pressure and shuts itself down as the pressure exceeds a predetermined safe operating value.

  17. Research reactors

    SciTech Connect

    Tonneson, L.C.; Fox, G.J.

    1996-04-01

    There are currently 284 research reactors in operation, and 12 under construction around the world. Of the operating reactors, nearly two-thirds are used exclusively for research, and the rest for a variety of purposes, including training, testing, and critical assembly. For more than 50 years, research reactor programs have contributed greatly to the scientific and educational communities. Today, six of the world`s research reactors are being shut down, three of which are in the USA. With government budget constraints and the growing proliferation concerns surrounding the use of highly enriched uranium in some of these reactors, the future of nuclear research could be impacted.

  18. 48 CFR 52.222-30 - Davis-Bacon Act-Price Adjustment (None or Separately Specified Method).

    Code of Federal Regulations, 2013 CFR

    2013-10-01

    ... 48 Federal Acquisition Regulations System 2 2013-10-01 2013-10-01 false Davis-Bacon Act-Price... CLAUSES Text of Provisions and Clauses 52.222-30 Davis-Bacon Act—Price Adjustment (None or Separately Specified Method). As prescribed in 22.407(e), insert the following clause: Davis-Bacon Act—Price...

  19. NEUTRONIC REACTOR

    DOEpatents

    Fraas, A.P.; Mills, C.B.

    1961-11-21

    A neutronic reactor in which neutron moderation is achieved primarily in its reflector is described. The reactor structure consists of a cylindrical central "island" of moderator and a spherical moderating reflector spaced therefrom, thereby providing an annular space. An essentially unmoderated liquid fuel is continuously passed through the annular space and undergoes fission while contained therein. The reactor, because of its small size, is particularly adapted for propulsion uses, including the propulsion of aircraft. (AEC)

  20. REACTOR COOLING

    DOEpatents

    Quackenbush, C.F.

    1959-09-29

    A nuclear reactor with provisions for selectively cooling the fuel elements is described. The reactor has a plurality of tubes extending throughout. Cylindrical fuel elements are disposed within the tubes and the coolant flows through the tubes and around the fuel elements. The fuel elements within the central portion of the reactor are provided with roughened surfaces of material. The fuel elements in the end portions of the tubes within the reactor are provlded with low conduction jackets and the fuel elements in the region between the central portion and the end portions are provided with smooth surfaces of high heat conduction material.

  1. NEUTRONIC REACTOR

    DOEpatents

    Wigner, E.P.

    1958-04-22

    A nuclear reactor for isotope production is described. This reactor is designed to provide a maximum thermal neutron flux in a region adjacent to the periphery of the reactor rather than in the center of the reactor. The core of the reactor is generally centrally located with respect tn a surrounding first reflector, constructed of beryllium. The beryllium reflector is surrounded by a second reflector, constructed of graphite, which, in tune, is surrounded by a conventional thermal shield. Water is circulated through the core and the reflector and functions both as a moderator and a coolant. In order to produce a greatsr maximum thermal neutron flux adjacent to the periphery of the reactor rather than in the core, the reactor is designed so tbat the ratio of neutron scattering cross section to neutron absorption cross section averaged over all of the materials in the reflector is approximately twice the ratio of neutron scattering cross section to neutron absorption cross section averaged over all of the material of the core of the reactor.

  2. Reactor building

    SciTech Connect

    Hista, J. C.

    1984-09-18

    Reactor building comprising a vessel shaft anchored in a slab which is peripherally locked. This reactor building comprises a confinement enclosure within which are positioned internal structures constituted by an internal structure floor, a vessel shaft, a slab being positioned between the general floor and the internal structure floor, the vesse

  3. NEUTRONIC REACTOR

    DOEpatents

    Metcalf, H.E.; Johnson, H.W.

    1961-04-01

    BS>A nuclear reactor incorporating fuel rods passing through a moderator and including tubes of a material of higher Thermal conductivity than the fuel in contact with the fuel is described. The tubes extend beyond the active portion of the reactor into contant with a fiuld coolant.

  4. Brownfields Davis Bacon for Cleanup Grants: Hazardous Substances for Government Entities

    EPA Pesticide Factsheets

    The following terms and conditions specify how Recipients will assist EPA in meeting its Davis-Bacon (DB) responsibilities when DB applies to EPA awards of financial assistance under any statute which makes DB applicable to EPA financial assistance.

  5. Brownfields Davis Bacon for Revolving Loan Fund Grants: RLF Grants to Governmental/Quasi-Governmental Organizations

    EPA Pesticide Factsheets

    Terms & conditions specify how Recipients will assist EPA in meeting its Davis Bacon responsibilities when DB applies to EPA awards of financial assistance under the Recovery Act or any other statute which makes DB applicable to EPA financial assistance.

  6. Brownfields Davis Bacon for Cleanup Grants: Petroleum for Non-Profit Entities

    EPA Pesticide Factsheets

    Terms & conditions specify how Recipients will assist EPA in meeting its Davis Bacon responsibilities when DB applies to EPA awards of financial assistance under the Recovery Act or any other statute which makes DB applicable to EPA financial assistance.

  7. Brownfields Davis Bacon for Cleanup Grants: Hazardous Substances for Non-Profit Entities

    EPA Pesticide Factsheets

    The following terms and conditions specify how Recipients will assist EPA in meeting its Davis Bacon (DB) responsibilities when DB applies to EPA awards of financial assistance under any other statute which makes DB applicable to EPA financial assistance.

  8. JAFCO d/b/a Paul Davis Restoration and Remodeling Information Sheet

    EPA Pesticide Factsheets

    JAFCO d/b/a Paul Davis Restoration and Remodeling (the Company) is located in Memphis, Tennessee. The settlement involves renovation activities conducted at property constructed prior to 1978, located in Memphis, Tennessee.

  9. Synopsis of the species of the genus Myxobilatus Davis, 1944 (Myxozoa: Myxosporea: Myxobilatidae).

    PubMed

    Rangel, Luis F; Gibson, David I; Santos, Maria J

    2014-02-01

    A synopsis of the species of Myxobilatus Davis, 1944 (Myxozoa: Myxosporea: Myxobilatidae) is presented. Thirty-nine nominal species are included. The major characteristics and an illustration are given for each species based on the original records.

  10. STS-47 MS Davis holds mixed protein sample while working at SLJ Rack 7 FFEU

    NASA Technical Reports Server (NTRS)

    1992-01-01

    STS-47 Mission Specialist (MS) N. Jan Davis labels sample vial containing mixed proteins while conducting the Separation of Biogenic Materials by Electrophoresis Under Zero Gravity / Separation of Animal Cells and Cellular Organella by Means of Free Flow Electrophoresis (FFEU). Davis is in the Spacelab Japan (SLJ) science module aboard Endeavour, Orbiter Vehicle (OV) 105. She talks to ground controllers as she works with the Free Flow Electrophoresis Unit (FFEU) located in SLJ Rack 7.

  11. The Davis-Bacon Act: Cost Impact on the Air Force

    DTIC Science & Technology

    1992-09-01

    June 1977 issue of the Labor Law Journal, Donald Elisburg, then Assistant Secretary of Labor for Employment Standards, discussed an Executive Order...1992). 7. Elisburg, Donald. "Wage Protection Under the Davis- Bacon Act," Labor Law Journal, 28: 323-328 (June 1977). 8. Federal Acquisition...R. "Davis-Bacon: Labor’s Anachronism 1974," Labor Law Journal, 25: 404-407 (July 1974). 59 Vita Raymond Carpenter was born on 18 August 1953 in

  12. Accuracy and progress in the analytics of pharmaceuticalization: a response to Davis (2014).

    PubMed

    Abraham, John

    2015-04-01

    This commentary considers the important contribution to understanding pharmaceuticalization made by Davis's (2014) case study of cancer drug treatment in end-of-life-care. However, it argues that Davis (2014) has misunderstood some aspects of the conceptual and analytical framework put forward by Abraham (2010) as a way of explaining the nature and implications of pharmaceuticalization. Copyright © 2015 Elsevier Ltd. All rights reserved.

  13. Evolution of spatial resolution in breast CT at UC Davis

    SciTech Connect

    Gazi, Peymon M.; Yang, Kai; Burkett, George W.; Aminololama-Shakeri, Shadi; Anthony Seibert, J.; Boone, John M.

    2015-04-15

    Purpose: Dedicated breast computed tomography (bCT) technology for the purpose of breast cancer screening has been a focus of research at UC Davis since the late 1990s. Previous studies have shown that improvement in spatial resolution characteristics of this modality correlates with greater microcalcification detection, a factor considered a potential limitation of bCT. The aim of this study is to improve spatial resolution as characterized by the modulation transfer function (MTF) via changes in the scanner hardware components and operational schema. Methods: Four prototypes of pendant-geometry, cone-beam breast CT scanners were designed and developed spanning three generations of design evolution. To improve the system MTF in each bCT generation, modifications were made to the imaging components (x-ray tube and flat-panel detector), system geometry (source-to-isocenter and detector distance), and image acquisition parameters (technique factors, number of projections, system synchronization scheme, and gantry rotational speed). Results: Characterization of different generations of bCT systems shows these modifications resulted in a 188% improvement of the limiting MTF properties from the first to second generation and an additional 110% from the second to third. The intrinsic resolution degradation in the azimuthal direction observed in the first generation was corrected by changing the acquisition from continuous to pulsed x-ray acquisition. Utilizing a high resolution detector in the third generation, along with modifications made in system geometry and scan protocol, resulted in a 125% improvement in limiting resolution. An additional 39% improvement was obtained by changing the detector binning mode from 2 × 2 to 1 × 1. Conclusions: These results underscore the advancement in spatial resolution characteristics of breast CT technology. The combined use of a pulsed x-ray system, higher resolution flat-panel detector and changing the scanner geometry and image

  14. Humphry Davy, nitrous oxide, the Pneumatic Institution, and the Royal Institution.

    PubMed

    West, John B

    2014-11-01

    Humphry Davy (1778-1829) has an interesting place in the history of respiratory gases because the Pneumatic Institution in which he did much of his early work signaled the end of an era of discovery. The previous 40 years had seen essentially all of the important respiratory gases described, and the Institution was formed to exploit their possible value in medical treatment. Davy himself is well known for producing nitrous oxide and demonstrating that its inhalation could cause euphoria and heightened imagination. His thinking influenced the poets Samuel Taylor Coleridge and William Wordsworth, and perhaps we can claim that our discipline colored the poetry of the Romantic Movement. Davy was also the first person to measure the residual volume of the lung. The Pneumatic Institution was the brainchild of Thomas Beddoes, who had trained in Edinburgh under Joseph Black, who discovered carbon dioxide. Later Davy moved to the Royal Institution in London formed, in part, to diffuse the knowledge of scientific discoveries to the general public. Davy was a brilliant lecturer and developed an enthusiastic following. In addition he exploited the newly described electric battery to discover several new elements. He also invented the safety lamp in response to a series of devastating explosions in coal mines. Ultimately Davy became president of the Royal Society, a remarkable honor for somebody with such humble origins. Another of his important contributions was to introduce Michael Faraday (1791-1867) to science. Faraday became one of the most illustrious British scientists of all time.

  15. Compact Reactor

    NASA Astrophysics Data System (ADS)

    Williams, Pharis E.

    2007-01-01

    Weyl's Gauge Principle of 1929 has been used to establish Weyl's Quantum Principle (WQP) that requires that the Weyl scale factor should be unity. It has been shown that the WQP requires the following: quantum mechanics must be used to determine system states; the electrostatic potential must be non-singular and quantified; interactions between particles with different electric charges (i.e. electron and proton) do not obey Newton's Third Law at sub-nuclear separations, and nuclear particles may be much different than expected using the standard model. The above WQP requirements lead to a potential fusion reactor wherein deuterium nuclei are preferentially fused into helium nuclei. Because the deuterium nuclei are preferentially fused into helium nuclei at temperatures and energies lower than specified by the standard model there is no harmful radiation as a byproduct of this fusion process. Therefore, a reactor using this reaction does not need any shielding to contain such radiation. The energy released from each reaction and the absence of shielding makes the deuterium-plus-deuterium-to-helium (DDH) reactor very compact when compared to other reactors, both fission and fusion types. Moreover, the potential energy output per reactor weight and the absence of harmful radiation makes the DDH reactor an ideal candidate for space power. The logic is summarized by which the WQP requires the above conditions that make the prediction of DDH possible. The details of the DDH reaction will be presented along with the specifics of why the DDH reactor may be made to cause two deuterium nuclei to preferentially fuse to a helium nucleus. The presentation will also indicate the calculations needed to predict the reactor temperature as a function of fuel loading, reactor size, and desired output and will include the progress achieved to date.

  16. Compact Reactor

    SciTech Connect

    Williams, Pharis E.

    2007-01-30

    Weyl's Gauge Principle of 1929 has been used to establish Weyl's Quantum Principle (WQP) that requires that the Weyl scale factor should be unity. It has been shown that the WQP requires the following: quantum mechanics must be used to determine system states; the electrostatic potential must be non-singular and quantified; interactions between particles with different electric charges (i.e. electron and proton) do not obey Newton's Third Law at sub-nuclear separations, and nuclear particles may be much different than expected using the standard model. The above WQP requirements lead to a potential fusion reactor wherein deuterium nuclei are preferentially fused into helium nuclei. Because the deuterium nuclei are preferentially fused into helium nuclei at temperatures and energies lower than specified by the standard model there is no harmful radiation as a byproduct of this fusion process. Therefore, a reactor using this reaction does not need any shielding to contain such radiation. The energy released from each reaction and the absence of shielding makes the deuterium-plus-deuterium-to-helium (DDH) reactor very compact when compared to other reactors, both fission and fusion types. Moreover, the potential energy output per reactor weight and the absence of harmful radiation makes the DDH reactor an ideal candidate for space power. The logic is summarized by which the WQP requires the above conditions that make the prediction of DDH possible. The details of the DDH reaction will be presented along with the specifics of why the DDH reactor may be made to cause two deuterium nuclei to preferentially fuse to a helium nucleus. The presentation will also indicate the calculations needed to predict the reactor temperature as a function of fuel loading, reactor size, and desired output and will include the progress achieved to date.

  17. NUCLEAR REACTOR

    DOEpatents

    Moore, R.V.; Bowen, J.H.; Dent, K.H.

    1958-12-01

    A heterogeneous, natural uranium fueled, solid moderated, gas cooled reactor is described, in which the fuel elements are in the form of elongated rods and are dlsposed within vertical coolant channels ln the moderator symmetrically arranged as a regular lattice in groups. This reactor employs control rods which operate in vertical channels in the moderator so that each control rod is centered in one of the fuel element groups. The reactor is enclosed in a pressure vessel which ls provided with access holes at the top to facilitate loading and unloadlng of the fuel elements, control rods and control rod driving devices.

  18. NEUTRONIC REACTOR

    DOEpatents

    Fermi, E.

    1960-04-01

    A nuclear reactor is described consisting of blocks of graphite arranged in layers, natural uranium bodies disposed in holes in alternate layers of graphite blocks, and coolant tubes disposed in the layers of graphite blocks which do not contain uranium.

  19. NEUTRONIC REACTORS

    DOEpatents

    Wigner, E.P.

    1960-11-22

    A nuclear reactor is described wherein horizontal rods of thermal- neutron-fissionable material are disposed in a body of heavy water and extend through and are supported by spaced parallel walls of graphite.

  20. NEUTRONIC REACTOR

    DOEpatents

    Anderson, H.L.

    1960-09-20

    A nuclear reactor is described comprising fissionable material dispersed in graphite blocks, helium filling the voids of the blocks and the spaces therebetween, and means other than the helium in thermal conductive contact with the graphite for removing heat.

  1. Reactor apparatus

    DOEpatents

    Echtler, J. Paul

    1981-01-01

    A reactor apparatus for hydrocracking a polynuclear aromatic hydrocarbonaceous feedstock to produce lighter hydrocarbon fuels by contacting the hydrocarbonaceous feedstock with hydrogen in the presence of a molten metal halide catalyst.

  2. Chemical Reactors.

    ERIC Educational Resources Information Center

    Kenney, C. N.

    1980-01-01

    Describes a course, including content, reading list, and presentation on chemical reactors at Cambridge University, England. A brief comparison of chemical engineering education between the United States and England is also given. (JN)

  3. NEUTRONIC REACTOR

    DOEpatents

    Hurwitz, H. Jr.; Brooks, H.; Mannal, C.; Payne, J.H.; Luebke, E.A.

    1959-03-24

    A reactor of the heterogeneous, liquid cooled type is described. This reactor is comprised of a central region of a plurality of vertically disposed elongated tubes surrounded by a region of moderator material. The central region is comprised of a central core surrounded by a reflector region which is surrounded by a fast neutron absorber region, which in turn is surrounded by a slow neutron absorber region. Liquid sodium is used as the primary coolant and circulates through the core which contains the fuel elements. Control of the reactor is accomplished by varying the ability of the reflector region to reflect neutrons back into the core of the reactor. For this purpose the reflector is comprised of moderator and control elements having varying effects on reactivity, the control elements being arranged and actuated by groups to give regulation, shim, and safety control.

  4. Reactor Engineering

    NASA Astrophysics Data System (ADS)

    Lema, Juan M.; López, Carmen; Eibes, Gemma; Taboada-Puig, Roberto; Moreira, M. Teresa; Feijoo, Gumersindo

    In this chapter, the engineering aspects of processes catalyzed by peroxidases will be presented. In particular, a discussion of the existing technologies that utilize peroxidases for different purposes, such as the removal of recalcitrant compounds or the synthesis of polymers, is analyzed. In the first section, the essential variables controlling the process will be investigated, not only those that are common in any enzymatic system but also those specific to peroxidative reactions. Next, different reactor configurations and operational modes will be proposed, emphasizing their suitability and unsuitability for different systems. Finally, two specific reactors will be described in detail: enzymatic membrane reactors and biphasic reactors. These configurations are especially valuable for the treatment of xenobiotics with high and poor water solubility, respectively.

  5. NUCLEAR REACTOR

    DOEpatents

    Miller, H.I.; Smith, R.C.

    1958-01-21

    This patent relates to nuclear reactors of the type which use a liquid fuel, such as a solution of uranyl sulfate in ordinary water which acts as the moderator. The reactor is comprised of a spherical vessel having a diameter of about 12 inches substantially surrounded by a reflector of beryllium oxide. Conventionnl control rods and safety rods are operated in slots in the reflector outside the vessel to control the operation of the reactor. An additional means for increasing the safety factor of the reactor by raising the ratio of delayed neutrons to prompt neutrons, is provided and consists of a soluble sulfate salt of beryllium dissolved in the liquid fuel in the proper proportion to obtain the result desired.

  6. NUCLEAR REACTOR

    DOEpatents

    Sherman, J.; Sharbaugh, J.E.; Fauth, W.L. Jr.; Palladino, N.J.; DeHuff, P.G.

    1962-10-23

    A nuclear reactor incorporating seed and blanket assemblies is designed. Means are provided for obtaining samples of the coolant from the blanket assemblies and for varying the flow of coolant through the blanket assemblies. (AEC)

  7. REACTOR SHIELD

    DOEpatents

    Wigner, E.P.; Ohlinger, L.E.; Young, G.J.; Weinberg, A.M.

    1959-02-17

    Radiation shield construction is described for a nuclear reactor. The shield is comprised of a plurality of steel plates arranged in parallel spaced relationship within a peripheral shell. Reactor coolant inlet tubes extend at right angles through the plates and baffles are arranged between the plates at right angles thereto and extend between the tubes to create a series of zigzag channels between the plates for the circulation of coolant fluid through the shield. The shield may be divided into two main sections; an inner section adjacent the reactor container and an outer section spaced therefrom. Coolant through the first section may be circulated at a faster rate than coolant circulated through the outer section since the area closest to the reactor container is at a higher temperature and is more radioactive. The two sections may have separate cooling systems to prevent the coolant in the outer section from mixing with the more contaminated coolant in the inner section.

  8. NEUTRONIC REACTORS

    DOEpatents

    Vernon, H.C.

    1959-01-13

    A neutronic reactor of the heterogeneous, fluid cooled tvpe is described. The reactor is comprised of a pressure vessel containing the moderator and a plurality of vertically disposed channels extending in spaced relationship through the moderator. Fissionable fuel material is placed within the channels in spaced relationship thereto to permit circulation of the coolant fluid. Separate means are provided for cooling the moderator and for circulating a fluid coolant thru the channel elements to cool the fuel material.

  9. NUCLEAR REACTOR

    DOEpatents

    Anderson, C.R.

    1962-07-24

    A fluidized bed nuclear reactor and a method of operating such a reactor are described. In the design means are provided for flowing a liquid moderator upwardly through the center of a bed of pellets of a nentron-fissionable material at such a rate as to obtain particulate fluidization while constraining the lower pontion of the bed into a conical shape. A smooth circulation of particles rising in the center and falling at the outside of the bed is thereby established. (AEC)

  10. NUCLEAR REACTOR

    DOEpatents

    Breden, C.R.; Dietrich, J.R.

    1961-06-20

    A water-soluble non-volatile poison may be introduced into a reactor to nullify excess reactivity. The poison is removed by passing a side stream of the water containing the soluble poison to an evaporation chamber. The vapor phase is returned to the reactor to decrease the concentration of soluble poison and the liquid phase is returned to increase the concentration of soluble poison.

  11. NUCLEAR REACTOR

    DOEpatents

    Grebe, J.J.

    1959-07-14

    High temperature reactors which are uniquely adapted to serve as the heat source for nuclear pcwered rockets are described. The reactor is comprised essentially of an outer tubular heat resistant casing which provides the main coolant passageway to and away from the reactor core within the casing and in which the working fluid is preferably hydrogen or helium gas which is permitted to vaporize from a liquid storage tank. The reactor core has a generally spherical shape formed entirely of an active material comprised of fissile material and a moderator material which serves as a diluent. The active material is fabricated as a gas permeable porous material and is interlaced in a random manner with very small inter-connecting bores or capillary tubes through which the coolant gas may flow. The entire reactor is divided into successive sections along the direction of the temperature gradient or coolant flow, each section utilizing materials of construction which are most advantageous from a nuclear standpoint and which at the same time can withstand the operating temperature of that particular zone. This design results in a nuclear reactor characterized simultaneously by a minimum critiral size and mass and by the ability to heat a working fluid to an extremely high temperature.

  12. Design and Implementation of Davis Social Links OSN Kernel

    NASA Astrophysics Data System (ADS)

    Tran, Thomas; Chan, Kelcey; Ye, Shaozhi; Bhattacharyya, Prantik; Garg, Ankush; Lu, Xiaoming; Wu, S. Felix

    Social network popularity continues to rise as they broaden out to more users. Hidden away within these social networks is a valuable set of data that outlines everyone’s relationships. Networks have created APIs such as the Facebook Development Platform and OpenSocial that allow developers to create applications that can leverage user information. However, at the current stage, the social network support for these new applications is fairly limited in its functionality. Most, if not all, of the existing internet applications such as email, BitTorrent, and Skype cannot benefit from the valuable social network among their own users. In this paper, we present an architecture that couples two different communication layers together: the end2end communication layer and the social context layer, under the Davis Social Links (DSL) project. Our proposed architecture attempts to preserve the original application semantics (i.e., we can use Thunderbird or Outlook, unmodified, to read our SMTP emails) and provides the communicating parties (email sender and receivers) a social context for control and management. For instance, the receiver can set trust policy rules based on the social context between the pair, to determine how a particular email in question should be prioritized for delivery to the SMTP layer. Furthermore, as our architecture includes two coupling layers, it is then possible, as an option, to shift some of the services from the original applications into the social context layer. In the context of email, for example, our architecture allows users to choose operations, such as reply, reply-all, and forward, to be realized in either the application layer or the social network layer. And, the realization of these operations under the social network layer offers powerful features unavailable in the original applications. To validate our coupling architecture, we have implemented a DSL kernel prototype as a Facebook application called CyrusDSL (currently about

  13. Draft environmental assessment: Davis Canyon site, Utah. Nuclear Waste Policy Act (Section 112). [Contains glossary

    SciTech Connect

    Not Available

    1984-12-01

    In February 1983, the US Department of Energy (DOE) identified the Davis Canyon site in Utah, as one of nine potentially acceptable sites for a mined geologic repository for spent nuclear fuel and high-level radioactive waste. To determine their suitability, the Davis Canyon site and the eight other potentially acceptable sites have been evaluated in accordance with the DOE's General Guidelines for the Recommendation of Sites for Nuclear Waste Repositories. These evaluations are reported in this draft environmental assessment (EA), which is being issued for public review and comment. The DOE findings and determinations that are based on these evaluations are preliminary and subject to public review and comment. A final EA will be prepared after considering the comments received. On the basis of the evaluations reported in this draft EA, the DOE has found that the Davis Canyon site is not disqualified under the guidelines. The site is in the Paradox Basin, which is one of five distinct geohydrologic settings considered for the first repository. This setting contains one other potentially acceptable site - the Lavender Canyon site. Although the Lavender Canyon site appears to be suitable for site characterization, the DOE has concluded that the Davis Canyon site is the preferred site in the Paradox Basin. Furthermore, the DOE finds that the site is suitable for site characterization because the evidence does not support a conclusion that the site will not be able to meet each of the qualifying conditions specified in the guidelines. On the basis of these findings, the DOE is proposing to nominate the Davis Canyon site as one of five sites suitable for characterization. Having compared the Davis Canyon site with the other four sites proposed for nomination, the DOE has determined that the Davis Canyon site is not one of the three preferred sites for recommendation to the President as candidates for characterization.

  14. Research reactors - an overview

    SciTech Connect

    West, C.D.

    1997-03-01

    A broad overview of different types of research and type reactors is provided in this paper. Reactor designs and operating conditions are briefly described for four reactors. The reactor types described include swimming pool reactors, the High Flux Isotope Reactor, the Mark I TRIGA reactor, and the Advanced Neutron Source reactor. Emphasis in the descriptions is placed on safety-related features of the reactors. 7 refs., 7 figs., 2 tabs.

  15. Davis Pond freshwater prediversion biomonitoring study: freshwater fisheries and eagles

    USGS Publications Warehouse

    Jenkins, Jill A.; Bourgeois, E. Beth; Jeske, Clint W.

    2008-01-01

    In January 2001, the construction of the Davis Pond freshwater diversion structure was completed by the U.S. Army Corps of Engineers. The diversion of freshwater from the Mississippi River is intended to mitigate saltwater intrusion from the Gulf of Mexico and to lessen the concomitant loss of wetland areas. In addition to the freshwater inflow, Barataria Bay basin would receive nutrients, increased flows of sediments, and water-borne and sediment-bound compounds. The purpose of this biomonitoring study was, therefore, to serve as a baseline for prediversion concentrations of selected contaminants in bald eagle (Haliaeetus leucocephalus) nestlings (hereafter referred to as eaglets), representative freshwater fish, and bivalves. Samples were collected from January through June 2001. Two similarly designed postdiversion studies, as described in the biological monitoring program, are planned. Active bald eagle nests targeted for sampling eaglet blood (n = 6) were generally located southwest and south of the diversion structure. The designated sites for aquatic animal sampling were at Lake Salvador, at Lake Cataouatche, at Bayou Couba, and along the Mississippi River. Aquatic animals representative of eagle prey were collected. Fish were from three different trophic levels and have varying feeding strategies and life histories. These included herbivorous striped mullet (Mugil cephalus), omnivorous blue catfish (Ictalurus furcatus), and carnivorous largemouth bass (Micropterus salmoides). Three individuals per species were collected at each of the four sampling sites. Freshwater Atlantic rangia clams (Rangia cuneata) were collected at the downstream marsh sites, and zebra mussels (Dreissena spp.) were collected on the Mississippi River. The U.S. Geological Survey (USGS) Biomonitoring of Environmental Status and Trends (BEST) protocols served as guides for fish sampling and health assessments. Fish are useful for monitoring aquatic ecosystems because they accumulate

  16. NEUTRONIC REACTOR

    DOEpatents

    Ohlinger, L.A.; Wigner, E.P.; Weinberg, A.M.; Young, G.J.

    1958-09-01

    This patent relates to neutronic reactors of the heterogeneous water cooled type, and in particular to a fuel element charging and discharging means therefor. In the embodiment illustrated the reactor contains horizontal, parallel coolant tubes in which the fuel elements are disposed. A loading cart containing a magnzine for holding a plurality of fuel elements operates along the face of the reactor at the inlet ends of the coolant tubes. The loading cart is equipped with a ram device for feeding fuel elements from the magazine through the inlot ends of the coolant tubes. Operating along the face adjacent the discharge ends of the tubes there is provided another cart means adapted to receive irradiated fuel elements as they are forced out of the discharge ends of the coolant tubes by the incoming new fuel elements. This cart is equipped with a tank coataining a coolant, such as water, into which the fuel elements fall, and a hydraulically operated plunger to hold the end of the fuel element being discharged. This inveation provides an apparatus whereby the fuel elements may be loaded into the reactor, irradiated therein, and unloaded from the reactor without stopping the fiow of the coolant and without danger to the operating personnel.

  17. UC Davis Fuel Cell, Hydrogen, and Hybrid Vehicle (FCH2V) GATE Center of Excellence

    SciTech Connect

    Erickson, Paul

    2012-05-31

    This is the final report of the UC Davis Fuel Cell, Hydrogen, and Hybrid Vehicle (FCH2V) GATE Center of Excellence which spanned from 2005-2012. The U.S. Department of Energy (DOE) established the Graduate Automotive Technology Education (GATE) Program, to provide a new generation of engineers and scientists with knowledge and skills to create advanced automotive technologies. The UC Davis Fuel Cell, Hydrogen, and Hybrid Vehicle (FCH2V) GATE Center of Excellence established in 2005 is focused on research, education, industrial collaboration and outreach within automotive technology. UC Davis has had two independent GATE centers with separate well-defined objectives and research programs from 1998. The Fuel Cell Center, administered by ITS-Davis, has focused on fuel cell technology. The Hybrid-Electric Vehicle Design Center (HEV Center), administered by the Department of Mechanical and Aeronautical Engineering, has focused on the development of plug-in hybrid technology using internal combustion engines. The merger of these two centers in 2005 has broadened the scope of research and lead to higher visibility of the activity. UC Davis's existing GATE centers have become the campus's research focal points on fuel cells and hybrid-electric vehicles, and the home for graduate students who are studying advanced automotive technologies. The centers have been highly successful in attracting, training, and placing top-notch students into fuel cell and hybrid programs in both industry and government.

  18. Davis Pond Freshwater Prediversion Biomonitoring Study: Freshwater Fisheries and Eagles

    USGS Publications Warehouse

    Jenkins, Jill A.; Bourgeois, E. Beth; Jeske, Clint W.

    2008-01-01

    In January 2001, the construction of the Davis Pond freshwater diversion structure was completed by the U.S. Army Corps of Engineers. The diversion of freshwater from the Mississippi River is intended to mitigate saltwater intrusion from the Gulf of Mexico and to lessen the concomitant loss of wetland areas. In addition to the freshwater inflow, Barataria Bay basin would receive nutrients, increased flows of sediments, and water-borne and sediment-bound compounds. The purpose of this biomonitoring study was, therefore, to serve as a baseline for prediversion concentrations of selected contaminants in bald eagle (Haliaeetus leucocephalus) nestlings (hereafter referred to as eaglets), representative freshwater fish, and bivalves. Samples were collected from January through June 2001. Two similarly designed postdiversion studies, as described in the biological monitoring program, are planned. Active bald eagle nests targeted for sampling eaglet blood (n = 6) were generally located southwest and south of the diversion structure. The designated sites for aquatic animal sampling were at Lake Salvador, at Lake Cataouatche, at Bayou Couba, and along the Mississippi River. Aquatic animals representative of eagle prey were collected. Fish were from three different trophic levels and have varying feeding strategies and life histories. These included herbivorous striped mullet (Mugil cephalus), omnivorous blue catfish (Ictalurus furcatus), and carnivorous largemouth bass (Micropterus salmoides). Three individuals per species were collected at each of the four sampling sites. Freshwater Atlantic rangia clams (Rangia cuneata) were collected at the downstream marsh sites, and zebra mussels (Dreissena spp.) were collected on the Mississippi River. The U.S. Geological Survey (USGS) Biomonitoring of Environmental Status and Trends (BEST) protocols served as guides for fish sampling and health assessments. Fish are useful for monitoring aquatic ecosystems because they accumulate

  19. NUCLEAR REACTOR

    DOEpatents

    Christy, R.F.

    1958-07-15

    A nuclear reactor of the homogeneous liquid fuel type is described wherein the fissionable isotope is suspended or dissolved in a liquid moderator such as water. The reactor core is comprised essentially of a spherical vessel for containing the reactive composition surrounded by a reflector, preferably of beryllium oxide. The reactive composition may be an ordinary water solution of a soluble salt of uranium, the quantity of fissionable isotope in solution being sufficient to provide a critical mass in the vessel. The liquid fuel is stored in a tank of non-crtttcal geometry below the reactor vessel and outside of the reflector and is passed from the tank to the vessel through a pipe connecting the two by air pressure means. Neutron absorbing control and safety rods are operated within slots in the reflector adjacent to the vessel.

  20. NEUTRONIC REACTOR

    DOEpatents

    Metcalf, H.E.

    1957-10-01

    A reactor of the type which preferably uses plutonium as the fuel and a liquid moderator, preferably ordinary water, and which produces steam within the reactor core due to the heat of the chain reaction is described. In the reactor shown the fuel elements are essentially in the form of trays and are ventically stacked in spaced relationship. The water moderator is continuously supplied to the trays to maintain a constant level on the upper surfaces of the fuel element as it is continually evaporated by the heat. The steam passes out through the spaces between the fuel elements and is drawn off at the top of the core. The fuel elements are clad in aluminum to prevent deterioration thereof with consequent contamimation of the water.

  1. REACTOR CONTROL

    DOEpatents

    Fortescue, P.; Nicoll, D.

    1962-04-24

    A control system employed with a high pressure gas cooled reactor in which a control rod is positioned for upward and downward movement into the neutron field from a position beneath the reactor is described. The control rod is positioned by a coupled piston cylinder releasably coupled to a power drive means and the pressurized coolant is directed against the lower side of the piston. The coolant pressure is offset by a higher fiuid pressure applied to the upper surface of the piston and means are provided for releasing the higher pressure on the upper side of the piston so that the pressure of the coolant drives the piston upwardly, forcing the coupled control rod into the ncutron field of the reactor. (AEC)

  2. NEUTRONIC REACTORS

    DOEpatents

    Wigner, E.P.; Young, G.J.

    1958-10-14

    A method is presented for loading and unloading rod type fuel elements of a neutronic reactor of the heterogeneous, solld moderator, liquid cooled type. In the embodiment illustrated, the fuel rods are disposed in vertical coolant channels in the reactor core. The fuel rods are loaded and unloaded through the upper openings of the channels which are immersed in the coolant liquid, such as water. Unloading is accomplished by means of a coffer dam assembly having an outer sleeve which is placed in sealing relation around the upper opening. A radiation shield sleeve is disposed in and reciprocable through the coffer dam sleeve. A fuel rod engaging member operates through the axial bore in the radiation shield sleeve to withdraw the fuel rod from its position in the reactor coolant channel into the shield, the shield snd rod then being removed. Loading is accomplished in the reverse procedure.

  3. Bioconversion reactor

    DOEpatents

    McCarty, Perry L.; Bachmann, Andre

    1992-01-01

    A bioconversion reactor for the anaerobic fermentation of organic material. The bioconversion reactor comprises a shell enclosing a predetermined volume, an inlet port through which a liquid stream containing organic materials enters the shell, and an outlet port through which the stream exits the shell. A series of vertical and spaced-apart baffles are positioned within the shell to force the stream to flow under and over them as it passes from the inlet to the outlet port. The baffles present a barrier to the microorganisms within the shell causing them to rise and fall within the reactor but to move horizontally at a very slow rate. Treatment detention times of one day or less are possible.

  4. Catalytic reactor

    SciTech Connect

    Aaron, Timothy Mark; Shah, Minish Mahendra; Jibb, Richard John

    2009-03-10

    A catalytic reactor is provided with one or more reaction zones each formed of set(s) of reaction tubes containing a catalyst to promote chemical reaction within a feed stream. The reaction tubes are of helical configuration and are arranged in a substantially coaxial relationship to form a coil-like structure. Heat exchangers and steam generators can be formed by similar tube arrangements. In such manner, the reaction zone(s) and hence, the reactor is compact and the pressure drop through components is minimized. The resultant compact form has improved heat transfer characteristics and is far easier to thermally insulate than prior art compact reactor designs. Various chemical reactions are contemplated within such coil-like structures such that as steam methane reforming followed by water-gas shift. The coil-like structures can be housed within annular chambers of a cylindrical housing that also provide flow paths for various heat exchange fluids to heat and cool components.

  5. POWER REACTOR

    DOEpatents

    Zinn, W.H.

    1958-07-01

    A fast nuclear reactor system ls described for producing power and radioactive isotopes. The reactor core is of the heterogeneous, fluid sealed type comprised of vertically arranged elongated tubular fuel elements having vertical coolant passages. The active portion is surrounded by a neutron reflector and a shield. The system includes pumps and heat exchangers for the primary and secondary coolant circuits. The core, primary coolant pump and primary heat exchanger are disposed within an irapenforate tank which is filled with the primary coolant, in this case a liquid metal such as Na or NaK, to completely submerge these elements. The tank is completely surrounded by a thick walled concrete shield. This reactor system utilizes enriched uranium or plutonium as the fissionable material, uranium or thorium as a diluent and thorium or uranium containing less than 0 7% of the U/sup 235/ isotope as a fertile material.

  6. NEUTRONIC REACTOR

    DOEpatents

    Fermi, E.; Szilard, L.

    1957-09-24

    Reactors of the type employing plates of natural uranium in a moderator are discussed wherein the plates are um-formly disposed in parallel relationship to each other thereby separating the moderator material into distinct and individual layers. Each plate has an uninterrupted sunface area substantially equal to the cross-sectional area of the active portion of the reactor, the particular size of the plates and the volume ratio of moderator to uranium required to sustain a chain reaction being determinable from the known purity of these materials and other characteristics such as the predictable neutron losses due to the formation of radioactive elements of extremely high neutron capture cross section.

  7. NEUTRONIC REACTOR

    DOEpatents

    Wigner, E.P.; Weinberg, A.W.; Young, G.J.

    1958-04-15

    A nuclear reactor which uses uranium in the form of elongated tubes as fuel elements and liquid as a coolant is described. Elongated tubular uranium bodies are vertically disposed in an efficient neutron slowing agent, such as graphite, for example, to form a lattice structure which is disposed between upper and lower coolant tanks. Fluid coolant tubes extend through the uranium bodies and communicate with the upper and lower tanks and serve to convey the coolant through the uranium body. The reactor is also provided with means for circulating the cooling fluid through the coolant tanks and coolant tubes, suitable neutron and gnmma ray shields, and control means.

  8. In defense of compilation: A response to Davis' form and content in model-based reasoning

    NASA Technical Reports Server (NTRS)

    Keller, Richard

    1990-01-01

    In a recent paper entitled 'Form and Content in Model Based Reasoning', Randy Davis argues that model based reasoning research aimed at compiling task specific rules from underlying device models is mislabeled, misguided, and diversionary. Some of Davis' claims are examined and his basic conclusions are challenged about the value of compilation research to the model based reasoning community. In particular, Davis' claim is refuted that model based reasoning is exempt from the efficiency benefits provided by knowledge compilation techniques. In addition, several misconceptions are clarified about the role of representational form in compilation. It is concluded that techniques have the potential to make a substantial contribution to solving tractability problems in model based reasoning.

  9. Combat surgeons before, during, and after war: the legacy of Loyal Davis.

    PubMed

    Cannon, Jeremy W; Teff, Richard J

    2010-05-01

    By 1942, Loyal Davis had firmly established himself as a preeminent civilian neurosurgeon. With military operations rapidly escalating, he was recruited to serve in the European Theater of Operations as a consultant to the Surgeon General. Davis brought tremendous experience, insight, and leadership to this position; however, he found the military system in which he was suddenly immersed inefficient and impassive. His requests for even basic equipment became mired in endless bureaucracy even as his communiqués to the Chief Surgeon in the European Theater and to the Surgeon General's staff in Washington seemed to fall short of their intended recipients. Then, when he attempted to vent his frustrations to his academic colleagues, he was nearly court-martialed. Notwithstanding, Davis became the first to formally recognize high-altitude frostbite and also developed protective headgear for airmen, and later in his service, he joined a contingent of senior medical leaders who visited the Soviet Union to study their system of combat casualty care. Subsequent to his service on active duty, Davis returned to his academic practice at Northwestern where he used his position as editor of Surgery, Gynecology, and Obstetrics to advocate for change within the military medical corps. Others like Davis have contributed greatly to the advancement of combat casualty care both during active service and long after their time in uniform. This paper examines the lessons from Davis's experiences as a military neurosurgeon and his continued advocacy for change in the medical corps along with additional recent examples of change effected by former military surgeons. For those currently serving, these lessons illustrate the value of contributing wherever a need is recognized, and for those who have served in the past, they demonstrate the importance of having a continued voice with junior combat surgeons and the military leadership.

  10. Rise Time of the Simulated VERITAS 12 m Davies-Cotton Reflector

    SciTech Connect

    White, Richard J.

    2005-02-21

    The Very Energetic Radiation Imaging Telescope Array System (VERITAS) will utilise Imaging Atmospheric Cherenkov Telescopes (IACTs) based on a Davies-Cotton design with f-number f/1.0 to detect cosmic gamma-rays. Unlike a parabolic reflector, light from the Davies-Cotton does not arrive isochronously at the camera. Here the effect of the telescope geometry on signal rise-time is examined. An almost square-pulse arrival time profile with a rise time of 1.7 ns is found analytically and confirmed through simulation.

  11. STS-47 MS Davis and MS Jemison conduct LBNP experiment in the SLJ module

    NASA Technical Reports Server (NTRS)

    1992-01-01

    At the aft end of the Spacelab Japan (SLJ) science module, STS-47 Mission Specialist (MS) N. Jan Davis (foreground) readies Rack 9 Automatic Blood Pressure System (ABPS) controls as MS Mae C. Jemison, inside the cylindrical fabric lower body negative pressure (LBNP) device, waits for the LBNP experiment to begin. LBNP device is sealed around Jemison's waist. It is attached to the SLJ floor and has a controller that operates a pump to change the pressure inside. Davis will monitor Jemison's pulse rate, blood pressure, and cardiac dimensions and functions.

  12. STS-47 MS Davis and MS Jemison conduct LBNP experiment in the SLJ module

    NASA Technical Reports Server (NTRS)

    1992-01-01

    At the aft end of the Spacelab Japan (SLJ) science module, STS-47 Mission Specialist (MS) N. Jan Davis (foreground) readies Rack 9 Automatic Blood Pressure System (ABPS) controls as MS Mae C. Jemison, inside the cylindrical fabric lower body negative pressure (LBNP) device, waits for the LBNP experiment to begin. LBNP device is sealed around Jemison's waist. It is attached to the SLJ floor and has a controller that operates a pump to change the pressure inside. Davis will monitor Jemison's pulse rate, blood pressure, and cardiac dimensions and functions.

  13. Neutronic reactor

    DOEpatents

    Carleton, John T.

    1977-01-25

    A graphite-moderated nuclear reactor includes channels between blocks of graphite and also includes spacer blocks between adjacent channeled blocks with an axis of extension normal to that of the axis of elongation of the channeled blocks to minimize changes in the physical properties of the graphite as a result of prolonged neutron bombardment.

  14. Sonochemical Reactors.

    PubMed

    Gogate, Parag R; Patil, Pankaj N

    2016-10-01

    Sonochemical reactors are based on the generation of cavitational events using ultrasound and offer immense potential for the intensification of physical and chemical processing applications. The present work presents a critical analysis of the underlying mechanisms for intensification, available reactor configurations and overview of the different applications exploited successfully, though mostly at laboratory scales. Guidelines have also been presented for optimum selection of the important operating parameters (frequency and intensity of irradiation, temperature and liquid physicochemical properties) as well as the geometric parameters (type of reactor configuration and the number/position of the transducers) so as to maximize the process intensification benefits. The key areas for future work so as to transform the successful technique at laboratory/pilot scale into commercial technology have also been discussed. Overall, it has been established that there is immense potential for sonochemical reactors for process intensification leading to greener processing and economic benefits. Combined efforts from a wide range of disciplines such as material science, physics, chemistry and chemical engineers are required to harness the benefits at commercial scale operation.

  15. NEUTRONIC REACTORS

    DOEpatents

    Anderson, H.L.

    1958-10-01

    The design of control rods for nuclear reactors are described. In this design the control rod consists essentially of an elongated member constructed in part of a neutron absorbing material and having tube means extending therethrough for conducting a liquid to cool the rod when in use.

  16. NEUTRONIC REACTOR

    DOEpatents

    Creutz, E.C.; Ohlinger, L.A.; Weinberg, A.M.; Wigner, E.P.; Young, G.J.

    1959-10-27

    BS>A reactor cooled by water, biphenyl, helium, or other fluid with provision made for replacing the fuel rods with the highest plutonium and fission product content without disassembling the entire core and for promptly cooling the rods after their replacement in order to prevent build-up of heat from fission product activity is described.

  17. Neutronic reactor

    DOEpatents

    Wende, Charles W. J.

    1976-08-17

    A safety rod for a nuclear reactor has an inner end portion having a gamma absorption coefficient and neutron capture cross section approximately equal to those of the adjacent shield, a central portion containing materials of high neutron capture cross section and an outer end portion having a gamma absorption coefficient at least equal to that of the adjacent shield.

  18. The Effects of the Davis Symbol Mastery System to Assist a Fourth Grader with Dyslexia in Spelling: A Case Report

    ERIC Educational Resources Information Center

    Amsberry, Gianna; McLaughlin, T. F.; Derby, K. Mark; Waco, Teresa

    2012-01-01

    The purpose of this study was to determine the effectiveness of using the Davis Symbol Mastery Procedure for Words (Davis, 1994) for improving spelling skills. The participant was a fourth-grade male diagnosed with a significant learning disability. The intervention consisted of having the participant write each word, its definition, the word in a…

  19. 33 CFR 100.1102 - Annual marine events on the Colorado River, between Davis Dam (Bullhead City, Arizona) and...

    Code of Federal Regulations, 2012 CFR

    2012-07-01

    ... Colorado River, between Davis Dam (Bullhead City, Arizona) and Headgate Dam (Parker, Arizona) within the... § 100.1102 Annual marine events on the Colorado River, between Davis Dam (Bullhead City, Arizona) and.... Regulated Area That portion of the lower Colorado River on the Arizona side between Thompson Bay and...

  20. 33 CFR 165.1124 - Annual Firework Events on the Colorado River, between Davis Dam (Bullhead City, Arizona) and...

    Code of Federal Regulations, 2014 CFR

    2014-07-01

    ... Colorado River, between Davis Dam (Bullhead City, Arizona) and Headgate Dam (Parker, Arizona) within the... § 165.1124 Annual Firework Events on the Colorado River, between Davis Dam (Bullhead City, Arizona) and... 8 p.m.-10 p.m. The safety zone includes all navigable waters of the lower Colorado River at...

  1. 33 CFR 100.1102 - Annual marine events on the Colorado River, between Davis Dam (Bullhead City, Arizona) and...

    Code of Federal Regulations, 2013 CFR

    2013-07-01

    ... Colorado River, between Davis Dam (Bullhead City, Arizona) and Headgate Dam (Parker, Arizona) within the... § 100.1102 Annual marine events on the Colorado River, between Davis Dam (Bullhead City, Arizona) and.... Regulated Area That portion of the lower Colorado River on the Arizona side between Thompson Bay and...

  2. 20 CFR 672.545 - Are YouthBuild programs subject to the Davis-Bacon Act labor standards?

    Code of Federal Regulations, 2013 CFR

    2013-04-01

    ...-Bacon Act labor standards? 672.545 Section 672.545 Employees' Benefits EMPLOYMENT AND TRAINING..., Costs, and Limitations § 672.545 Are YouthBuild programs subject to the Davis-Bacon Act labor standards? (a) YouthBuild programs and grantees are subject to Davis-Bacon labor standards requirements...

  3. 20 CFR 672.545 - Are YouthBuild programs subject to the Davis-Bacon Act labor standards?

    Code of Federal Regulations, 2014 CFR

    2014-04-01

    ...-Bacon Act labor standards? 672.545 Section 672.545 Employees' Benefits EMPLOYMENT AND TRAINING..., Costs, and Limitations § 672.545 Are YouthBuild programs subject to the Davis-Bacon Act labor standards? (a) YouthBuild programs and grantees are subject to Davis-Bacon labor standards requirements...

  4. 20 CFR 672.545 - Are YouthBuild programs subject to the Davis-Bacon Act labor standards?

    Code of Federal Regulations, 2012 CFR

    2012-04-01

    ...-Bacon Act labor standards? 672.545 Section 672.545 Employees' Benefits EMPLOYMENT AND TRAINING..., Costs, and Limitations § 672.545 Are YouthBuild programs subject to the Davis-Bacon Act labor standards? (a) YouthBuild programs and grantees are subject to Davis-Bacon labor standards requirements...

  5. Antillonatus, a new replacement name for the generic homonym Antillopsyche Núñez & Davis, 2016 (Lepidoptera: Tineoidea: Psychidae).

    PubMed

    Aguila, Rayner Núñez; Davis, Don R

    2016-02-16

    We have been informed that the name Antillopsyche Núñez & Davis 2016, type species Antillopsyche sessilis Núñez & Davis, 2016, which we recently proposed for a new genus of bagworm moths (Núñez & Davis 2016), is preoccupied by Antillopsyche Banks, 1941. This senior name was published for a genus of Trichoptera in the family Polycentropodidae (Banks 1941). We therefore propose the new name Antillonatus Núñez & Davis to replace the junior homonym Antillopsyche Núñez & Davis. The new generic name is derived from Antillae, the Latin word for Antilles, the archipelago where this taxon occurs, and the Latin natus (be born/begotten/arisen) in reference to the West Indian origin of the type species, which is the only known member of the genus.

  6. NUCLEAR REACTOR

    DOEpatents

    Grebe, J.J.

    1959-12-15

    A reactor which is particularly adapted tu serve as a heat source for a nuclear powered alrcraft or rocket is described. The core of this reactor consists of a porous refractory modera;or body which is impregnated with fissionable nuclei. The core is designed so that its surface forms tapered inlet and outlet ducts which are separated by the porous moderator body. In operation a gaseous working fluid is circulated through the inlet ducts to the surface of the moderator, enters and passes through the porous body, and is heated therein. The hot gas emerges into the outlet ducts and is available to provide thrust. The principle advantage is that tremendous quantities of gas can be quickly heated without suffering an excessive pressure drop.

  7. REACTOR UNLOADING

    DOEpatents

    Leverett, M.C.

    1958-02-18

    This patent is related to gas cooled reactors wherein the fuel elements are disposed in vertical channels extending through the reactor core, the cooling gas passing through the channels from the bottom to the top of the core. The invention is a means for unloading the fuel elements from the core and comprises dump values in the form of flat cars mounted on wheels at the bottom of the core structure which support vertical stacks of fuel elements. When the flat cars are moved, either manually or automatically, for normal unloading purposes, or due to a rapid rise in the reproduction ratio within the core, the fuel elements are permtted to fall by gravity out of the core structure thereby reducing the reproduction ratio or stopping the reaction as desired.

  8. NEUTRONIC REACTOR

    DOEpatents

    Wade, E.J.

    1958-09-16

    This patent relates to a reflector means for a neutronic reactor. A reflector comprised of a plurality of vertically movable beryllium control members is provided surrounding the sides of the reactor core. An absorber of fast neutrons comprised of natural uramum surrounds the reflector. An absorber of slow neutrons surrounds the absorber of fast neutrons and is formed of a plurality of beryllium blocks having natural uranium members distributcd therethrough. in addition, a movable body is positioned directly below the core and is comprised of a beryllium reflector and an absorbing member attached to the botiom thereof, the absorbing member containing a substance selected from the goup consisting of natural urantum and Th/sup 232/.

  9. REACTOR MONITORING

    DOEpatents

    Bugbee, S.J.; Hanson, V.F.; Babcock, D.F.

    1959-02-01

    A neutron density inonitoring means for reactors is described. According to this invention a tunnel is provided beneath and spaced from the active portion of the reactor and extends beyond the opposite faces of the activc portion. Neutron beam holes are provided between the active portion and the tunnel and open into the tunnel near the middle thereof. A carriage operates back and forth in the tunnel and is adapted to convey a neutron detector, such as an ion chamber, and position it beneath one of the neutron beam holes. This arrangement affords convenient access of neutron density measuring instruments to a location wherein direct measurement of neutron density within the piles can be made and at the same time affords ample protection to operating personnel.

  10. Nuclear reactor

    DOEpatents

    Wade, Elman E.

    1979-01-01

    A nuclear reactor including two rotatable plugs and a positive top core holddown structure. The top core holddown structure is divided into two parts: a small core cover, and a large core cover. The small core cover, and the upper internals associated therewith, are attached to the small rotating plug, and the large core cover, with its associated upper internals, is attached to the large rotating plug. By so splitting the core holddown structures, under-the-plug refueling is accomplished without the necessity of enlarging the reactor pressure vessel to provide a storage space for the core holddown structure during refueling. Additionally, the small and large rotating plugs, and their associated core covers, are arranged such that the separation of the two core covers to permit rotation is accomplished without the installation of complex lifting mechanisms.

  11. NUCLEAR REACTOR

    DOEpatents

    Treshow, M.

    1958-08-19

    A neuclear reactor is described of the heterogeneous type and employing replaceable tubular fuel elements and heavy water as a coolant and moderator. A pluraltty of fuel tubesa having their axes parallel, extend through a tank type pressure vessel which contatns the liquid moderator. The fuel elements are disposed within the fuel tubes in the reaetive portion of the pressure vessel during normal operation and the fuel tubes have removable plug members at each end to permit charging and discharging of the fuel elements. The fuel elements are cylindrical strands of jacketed fissionable material having helical exterior ribs. A bundle of fuel elements are held within each fuel tube with their longitudinal axes parallel, the ribs serving to space them apart along their lengths. Coolant liquid is circulated through the fuel tubes between the spaced fuel elements. Suitable control rod and monitoring means are provided for controlling the reactor.

  12. 75 FR 80549 - FirstEnergy Nuclear Operating Company, Davis-Besse Nuclear Power Station; Exemption

    Federal Register 2010, 2011, 2012, 2013, 2014

    2010-12-22

    ... From the Federal Register Online via the Government Publishing Office NUCLEAR REGULATORY COMMISSION FirstEnergy Nuclear Operating Company, Davis-Besse Nuclear Power Station; Exemption 1.0 Background FirstEnergy Nuclear Operating Company (FENOC, the licensee) is the holder of Facility Operating...

  13. 75 FR 16523 - FirstEnergy Nuclear Operating Company; Davis-Besse Nuclear Power Station; Exemption

    Federal Register 2010, 2011, 2012, 2013, 2014

    2010-04-01

    ... COMMISSION FirstEnergy Nuclear Operating Company; Davis-Besse Nuclear Power Station; Exemption 1.0 Background FirstEnergy Nuclear Operating Company (FENOC, the licensee) is the holder of Facility Operating License... M.S. Fertel, Nuclear Energy Institute). The licensee's request for an exemption is...

  14. 75 FR 38147 - FirstEnergy Nuclear Operating Company; Davis-Besse Nuclear Power Station; Exemption

    Federal Register 2010, 2011, 2012, 2013, 2014

    2010-07-01

    ... From the Federal Register Online via the Government Publishing Office NUCLEAR REGULATORY COMMISSION FirstEnergy Nuclear Operating Company; Davis-Besse Nuclear Power Station; Exemption 1.0 Background FirstEnergy Nuclear Operating Company (FENOC, the licensee) is the holder of Facility Operating...

  15. Humphrey Davy and the Safety Lamp: The Use of Metal Gauze as a Flame Barrier

    ERIC Educational Resources Information Center

    Mills, Allan

    2015-01-01

    The "safety lamp" invented by Humphrey Davy in 1815 utilised the cooling effect of metal gauze to prevent the flame of a candle or oil lamp (essential for illumination in mines) from passing through such a screen. It is therefore rendered unable to ignite any potentially explosive mixture of air and methane in the atmosphere surrounding…

  16. What Makes a Queer Family Queer? A Response to Cristyn Davies and Kerry H. Robinson

    ERIC Educational Resources Information Center

    Silin, Jonathan

    2013-01-01

    In this essay I respond to Cristyn Davies and Kerry Robinson's research on queer families by remarking on the distance GLBTQI people have travelled in the last half century. I raise critical questions about the potential gains and possible losses that may result from bringing heretofore subjugated knowledges into the school curriculum. Drawing on…

  17. Enrollment and Graduation Patterns of Undergraduates Transferring to UC Davis: 1984-1999. Research Synopsis.

    ERIC Educational Resources Information Center

    California Univ., Davis. Office of Student Affairs Research and Information.

    This report discusses the effort put forth by the University of California (UC) at Davis and California's community colleges to reinvigorate and strengthen transfer student academic success. The report offers information on the Transfer Opportunity Program (TOP), Transfer Admission Agreements (TAA), and Transfer Articulation Agreements that exist…

  18. The Little Engine That Could? Analyzing the Impact of Fiechtner and Davis (1984)

    ERIC Educational Resources Information Center

    Arbaugh, J. B.

    2016-01-01

    In this commentary, the author raises the question whether there are other pearls of wisdom from early articles of BME research that are being missed because they showed up in print too soon? Arbaugh bases his reasoning's from the 1984 article by Fiechtner and Davis ("Why Some Groups Fail: A Survey of Students' Experiences with Learning…

  19. Testing Mixture Models of Transitive Preference: Comment on Regenwetter, Dana, and Davis-Stober (2011)

    ERIC Educational Resources Information Center

    Birnbaum, Michael H.

    2011-01-01

    This article contrasts 2 approaches to analyzing transitivity of preference and other behavioral properties in choice data. The approach of Regenwetter, Dana, and Davis-Stober (2011) assumes that on each choice, a decision maker samples randomly from a mixture of preference orders to determine whether "A" is preferred to "B." In contrast, Birnbaum…

  20. The Compleat Teacher-Scholar: An Interview with Stephen F. Davis

    ERIC Educational Resources Information Center

    Buskist, William

    2009-01-01

    Stephen F. Davis is Emeritus Professor of Psychology at Emporia State University. He served as the 2002-2003 Knapp Distinguished Professor of Arts and Sciences at the University of San Diego. Currently, he is Distinguished Guest Professor at Morningside College and Visiting Distinguished Professor of Psychology at Texas Wesleyan University. Since…

  1. What Makes a Queer Family Queer? A Response to Cristyn Davies and Kerry H. Robinson

    ERIC Educational Resources Information Center

    Silin, Jonathan

    2013-01-01

    In this essay I respond to Cristyn Davies and Kerry Robinson's research on queer families by remarking on the distance GLBTQI people have travelled in the last half century. I raise critical questions about the potential gains and possible losses that may result from bringing heretofore subjugated knowledges into the school curriculum. Drawing on…

  2. The Importance of Quantification: Philip M. Davis--Albert R. Mann Library, Cornell University

    ERIC Educational Resources Information Center

    Library Journal, 2004

    2004-01-01

    As a college student, Phil Davis intended to become a scientist. But as he studied population genetics of a family of mosses, monitoring his experiments daily, he wondered, "Is this really how I want to spend my life?" After taking time off to read philosophy and bike his way around France, his answer was, "No." Instead, he decided to advance the…

  3. The Importance of Quantification: Philip M. Davis--Albert R. Mann Library, Cornell University

    ERIC Educational Resources Information Center

    Library Journal, 2004

    2004-01-01

    As a college student, Phil Davis intended to become a scientist. But as he studied population genetics of a family of mosses, monitoring his experiments daily, he wondered, "Is this really how I want to spend my life?" After taking time off to read philosophy and bike his way around France, his answer was, "No." Instead, he decided to advance the…

  4. Onboard photo: Astronaut Jan Davis inside Spacelab-J module (long view)

    NASA Technical Reports Server (NTRS)

    1992-01-01

    Space Shuttle Endeavour (STS-47) onboard photo of Astronaut Jan Davis inside the Spacelab-J module. Spacelab-J is a combined National Space Development Agency of Japan (NASDA) and NASA mission. The objectives included life sciences, microgravity and technology research.

  5. STS-47 MS Davis and MS Jemison with LBNP device in SLJ module aboard OV-105

    NASA Technical Reports Server (NTRS)

    1992-01-01

    STS-47 Mission Specialist (MS) N. Jan Davis (left) and MS Mae C. Jemison prepare the lower body negative pressure (LBNP) device for the LBNP experiment in the Spacelab Japan (SLJ) science module aboard the Earth-orbiting Endeavour, Orbiter Vehicle (OV) 105. Displayed on the aft end cone in the background is an Auburn University banner.

  6. "City of Quartz: Excavating the Future in Los Angeles," by Mike Davis [Book Review].

    ERIC Educational Resources Information Center

    Hunsaker, Alan

    1992-01-01

    Mike Davis's book presents a history and current sociology of Los Angeles from a socialist perspective, arguing that inequalities in the distribution of power and wealth underlie the area's serious, growing problems: ethnic fear and discrimination, social disinvestment and withdrawal by the "haves," and an epidemic of youth violence. (SV)

  7. The Compleat Teacher-Scholar: An Interview with Stephen F. Davis

    ERIC Educational Resources Information Center

    Buskist, William

    2009-01-01

    Stephen F. Davis is Emeritus Professor of Psychology at Emporia State University. He served as the 2002-2003 Knapp Distinguished Professor of Arts and Sciences at the University of San Diego. Currently, he is Distinguished Guest Professor at Morningside College and Visiting Distinguished Professor of Psychology at Texas Wesleyan University. Since…

  8. A Total Systems Approach: Reducing Workers' Compensation Costs at UC Davis.

    ERIC Educational Resources Information Center

    Kukulinsky, Janet C.

    1993-01-01

    The University of California (Davis) has revamped its workers' compensation program by improving accountability and safety, implementing safety training, informing workers of the costs of the workers' compensation program, designating a physician and physical therapist, giving light duty to injured employees, using sports medicine techniques, and…

  9. Research on wild relatives of fruit and nut crops at the Davis repository

    USDA-ARS?s Scientific Manuscript database

    The USDA germplasm repository in Davis is responsible for acquiring, conserving and distributing a broad spectrum of diversity of subtropical and temperate fruit and nut species germplasm to stakeholders around the world. Currently the repository holds over 7000 accessions of germplasm including Act...

  10. The Davis Junior High Global Warming Project and Bike/Walk to School Challenge

    NASA Astrophysics Data System (ADS)

    King, A.; Anastasio, C.; Niemeier, D.; Scow, K.

    2007-12-01

    Junior high school students in Davis, CA, were targeted in an outreach project combining interactive and hands- on information about global warming and carbon footprints with a bike/walk to school challenge. The project was conducted by the Kearney Foundation of Soil Science, the Department of Land, Air and Water Resources and the John Muir Institute of the Environment at the University of California Davis. Approximately 70 undergraduates, graduate students, post-doc researchers, faculty and staff from UCD and the town of Davis were involved. Workshops were held in the 7th, 8th and 9th grade science classes in Davis' 3 junior high schools, reaching a total of 1700 students. Each 50-minute presentation consisted of a Global Warming Jeopardy game, followed by individual calculation of carbon footprints oriented towards a junior high school student. Biking or walking to school, instead commuting by car, was introduced as an important and feasible activity that could reduce one's carbon footprint. Working with staff from each junior high, students were then challenged to increase biking or walking to school during a 2 week Bike/Walk to School Challenge . UCD students and staff monitored automobile commuting (# cars, idle time) and bike use during this time and provided incentives for biking or walking . All schools were recognized for efforts to reduce their carbon footprints, and the concept was reinforced at the start of the following school year by planting a tree at each school.

  11. [Davis Campus Academic Plan and Statistical Supplement, Revised 1967-1968.

    ERIC Educational Resources Information Center

    California Univ., Davis.

    This 1967-1968 revision of an academic plan that was approved in 1962 deals with the distinctive features of the University of California at Davis, its general objectives, and the plans for attaining stated goals. The introduction presents a brief historical background of the campus, including its distinctive features, growth, and problems. The…

  12. Tree health mapping with multispectral remote sensing data at UC Davis, California

    Treesearch

    Q. Xiao; E.G. McPherson

    2005-01-01

    Tree health is a critical parameter for evaluating urban ecosystem health and sustainability. Tradi­tionally, this parameter has been derived from field surveys. We used multispectral remote sensing data and GIS techniques to determine tree health at the University of California, Davis. The study area (363 ha) contained 8,962 trees of 215 species. Tree health...

  13. Economic evaluation of advanced limestone, Davy S-H, and Dowa Gypsum-producing FGD processes

    SciTech Connect

    Dotson, R.L.; Maxwell, J.D.; Burnett, T.A.

    1984-02-01

    Economic evaluations were made of three gypsum-producing FGD processes: advanced limestone (in-loop forced oxidation with adipic acid additive), Davy S-H (lime), and Dowa (aluminum sulfate, limestone). For a 500-MW power unit burning 3.5% sulfur coal and meeting the 1979 NSPS, capital investments in 1982 costs are 93 M$ (186 $/kW) for the advanced limestone process, 116 M$ (231 $/kW) for the Davy S-H process, and 121 M$ (243 $/kW) for the Dowa process. First-year annual revenue requirements in 1984 costs for these processes are 26, 33, and 32 M$ (9.4, 11.9, and 11.7 mills/kWh), respectively. The lower capital investment and annual revenue requirements of the advanced limestone process is due in part to the use of adipic acid, which allows partial scrubbing at 95% removal. The Davy S-H has slightly higher annual revenue requirements than the Dowa process because lime rather than limestone is used. Changes in power unit size and coal sulfur content affect the costs of all three processes similarly. The Davy S-H process is more sensitive to raw material costs because lime is used. Landfill waste disposal is a minor cost element in all three processes. 103 references, 26 figures, 30 tables.

  14. Persistence and Graduation of UC Davis Undergraduates Admitted by Special Action: 1975-1985.

    ERIC Educational Resources Information Center

    Hunziker, Celeste M.

    Persistence and graduation rates of University of California, Davis, special action students admitted in any fall quarter from 1975 to 1985 were studied. Special action students show academic potential but do not meet admission requirements of completed course work and academic achievement. The number of special action students during this 10-year…

  15. EOP and SAA Undergraduates Who Left UC Davis without a Degree.

    ERIC Educational Resources Information Center

    Rasor, Marianne

    Undergraduate students enrolled in the Educational Opportunity Program (EOP) or the Student Affirmative Action (SAA) program at the University of California (UC), Davis, who withdrew before graduation were surveyed in 1981. Attention was directed to the respondents' educational experiences after leaving, their current employment, and their…

  16. 75 FR 43519 - Parker-Davis Project; Transmission Capacity for Renewable Energy Between Electrical District No...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2010-07-26

    ... Area Power Administration Parker-Davis Project; Transmission Capacity for Renewable Energy Between... purpose of transmitting renewable energy. Specifically, Western is soliciting interest from entities looking to transfer renewable energy from the area south of Phoenix, Arizona to the Palo Verde market hub...

  17. Humphrey Davy and the Safety Lamp: The Use of Metal Gauze as a Flame Barrier

    ERIC Educational Resources Information Center

    Mills, Allan

    2015-01-01

    The "safety lamp" invented by Humphrey Davy in 1815 utilised the cooling effect of metal gauze to prevent the flame of a candle or oil lamp (essential for illumination in mines) from passing through such a screen. It is therefore rendered unable to ignite any potentially explosive mixture of air and methane in the atmosphere surrounding…

  18. The Little Engine That Could? Analyzing the Impact of Fiechtner and Davis (1984)

    ERIC Educational Resources Information Center

    Arbaugh, J. B.

    2016-01-01

    In this commentary, the author raises the question whether there are other pearls of wisdom from early articles of BME research that are being missed because they showed up in print too soon? Arbaugh bases his reasoning's from the 1984 article by Fiechtner and Davis ("Why Some Groups Fail: A Survey of Students' Experiences with Learning…

  19. The Prunus collection at the National Clonal Germplasm Repository in Davis, California

    USDA-ARS?s Scientific Manuscript database

    The National Clonal Germplasm Repository in Davis, CA is a United States Department of Agriculture (USDA), Agricultural Research Service (ARS) genebank that houses national collections of various Mediterranean fruit and nut crops. The Prunus collection is the second largest in this genebank and is e...

  20. Hope for Children Trapped in Failing Schools: The Promise of "Crawford v. Davy"

    ERIC Educational Resources Information Center

    Gomez, Julio C.

    2008-01-01

    On October 4, 2007, a trial level court in New Jersey dismissed "Crawford v. Davy", a class action lawsuit filed on behalf of 60,000 schoolchildren throughout the state seeking the court's authority to leave schools that fail to educate their students. By filing suit, plaintiff schoolchildren had hoped to be transferred to an alternative…

  1. STS-47 MS Davis trains at Payload Crew Training Complex at Marshall SFC

    NASA Technical Reports Server (NTRS)

    1992-01-01

    STS-47 Endeavour, Orbiter Vehicle (OV) 105, Mission Specialist (MS) N. Jan Davis, wearing the Autogenic Feedback Training System 2 suit and lightweight headset, reviews a Payload Systems Handbook in the Spacelab Japan (SLJ) mockup during training at the Payload Crew Training Complex at Marshall Space Flight Center (MSFC) in Huntsville, Alabama. View provided with alternate number 92P-137.

  2. 75 FR 22550 - Notice of Public Meeting, Davy Crockett National Forest Resource Advisory Committee

    Federal Register 2010, 2011, 2012, 2013, 2014

    2010-04-29

    ... Forest Service Notice of Public Meeting, Davy Crockett National Forest Resource Advisory Committee April... Forest Resource Advisory Committee. SUMMARY: In accordance with the Secure Rural Schools and Community... Crockett National Forest Resource Advisory Committee (RAC) meeting will meet as indicated below. DATES: The...

  3. "City of Quartz: Excavating the Future in Los Angeles," by Mike Davis [Book Review].

    ERIC Educational Resources Information Center

    Hunsaker, Alan

    1992-01-01

    Mike Davis's book presents a history and current sociology of Los Angeles from a socialist perspective, arguing that inequalities in the distribution of power and wealth underlie the area's serious, growing problems: ethnic fear and discrimination, social disinvestment and withdrawal by the "haves," and an epidemic of youth violence. (SV)

  4. Fair Employment Implication for HRD: The Case of Washington vs. Davis

    ERIC Educational Resources Information Center

    Sharf, James C.

    1977-01-01

    Examines several decisions of district and appeals courts and the Supreme Courts, both State and Federal, under title VII of the Civil Rights Act of 1964 and their implications for personnel and training management. In a reversal of the appeals court decision, the Supreme Court ruled in the case of Washington vs. Davis that the…

  5. A Total Systems Approach: Reducing Workers' Compensation Costs at UC Davis.

    ERIC Educational Resources Information Center

    Kukulinsky, Janet C.

    1993-01-01

    The University of California (Davis) has revamped its workers' compensation program by improving accountability and safety, implementing safety training, informing workers of the costs of the workers' compensation program, designating a physician and physical therapist, giving light duty to injured employees, using sports medicine techniques, and…

  6. 78 FR 43881 - Florida Petroleum Reprocessors Site, Davie, Broward County, Florida; Notice of Settlement

    Federal Register 2010, 2011, 2012, 2013, 2014

    2013-07-22

    ... AGENCY Florida Petroleum Reprocessors Site, Davie, Broward County, Florida; Notice of Settlement AGENCY... Protection Agency has entered into a settlement with Jap. Tech, Inc. concerning the Florida Petroleum... Ms. Paula V. Painter. Submit your comments by Site name Florida Petroleum Reprocesssors Site by...

  7. 78 FR 13339 - Florida Petroleum Reprocessors Site; Davie, Broward County, FL; Notice of Settlement

    Federal Register 2010, 2011, 2012, 2013, 2014

    2013-02-27

    ... AGENCY Florida Petroleum Reprocessors Site; Davie, Broward County, FL; Notice of Settlement AGENCY... Agency has entered into a settlement with 2238 NW. 86th Street Inc. concerning the Florida Petroleum... Ms. Paula V. Painter. Submit your comments by Site name Florida Petroleum Reprocesssors Site by...

  8. 77 FR 16548 - Florida Petroleum Reprocessors Superfund Site; Davie, Broward County, FL; Notice of Settlements

    Federal Register 2010, 2011, 2012, 2013, 2014

    2012-03-21

    ...] Florida Petroleum Reprocessors Superfund Site; Davie, Broward County, FL; Notice of Settlements AGENCY... entered into four (4) settlements for past response costs concerning the Florida Petroleum Reprocessors... settlement are available from Ms. Paula V. Painter. Submit your comments by Site name Florida...

  9. 75 FR 3955 - Environmental Impact Statement: Davis and Weber Counties, UT

    Federal Register 2010, 2011, 2012, 2013, 2014

    2010-01-25

    ... From the Federal Register Online via the Government Publishing Office DEPARTMENT OF TRANSPORTATION Federal Highway Administration Environmental Impact Statement: Davis and Weber Counties, UT AGENCY... notice to advise the public that an Environmental Impact Statement (EIS) will be prepared for a proposed...

  10. 48 CFR 52.222-31 - Davis-Bacon Act-Price Adjustment (Percentage Method).

    Code of Federal Regulations, 2011 CFR

    2011-10-01

    ... the Davis-Bacon Act to provide for an increase in wages and fringe benefits at the exercise of each... price adjustment at the exercise of each option to extend the term of the contract. This adjustment is... benefits as a result of— (1) Incorporation of the Department of Labor's wage determination applicable at...

  11. 48 CFR 52.222-31 - Davis-Bacon Act-Price Adjustment (Percentage Method).

    Code of Federal Regulations, 2012 CFR

    2012-10-01

    ... the Davis-Bacon Act to provide for an increase in wages and fringe benefits at the exercise of each... price adjustment at the exercise of each option to extend the term of the contract. This adjustment is... benefits as a result of— (1) Incorporation of the Department of Labor's wage determination applicable at...

  12. 48 CFR 52.222-31 - Davis-Bacon Act-Price Adjustment (Percentage Method).

    Code of Federal Regulations, 2010 CFR

    2010-10-01

    ... the Davis-Bacon Act to provide for an increase in wages and fringe benefits at the exercise of each... price adjustment at the exercise of each option to extend the term of the contract. This adjustment is... benefits as a result of— (1) Incorporation of the Department of Labor's wage determination applicable at...

  13. Neutronic reactor

    DOEpatents

    Lewis, Warren R.

    1978-05-30

    A graphite-moderated, water-cooled nuclear reactor including a plurality of rectangular graphite blocks stacked in abutting relationship in layers, alternate layers having axes which are normal to one another, alternate rows of blocks in alternate layers being provided with a channel extending through the blocks, said channeled blocks being provided with concave sides and having smaller vertical dimensions than adjacent blocks in the same layer, there being nuclear fuel in the channels.

  14. NUCLEAR REACTORS

    DOEpatents

    Long, E.; Ashby, J.W.

    1958-09-16

    ABS>A graphite moderator structure is presented for a nuclear reactor compriscd of an assembly of similarly orientated prismatic graphite blocks arranged on spaced longitudinal axes lying in common planes wherein the planes of the walls of the blocks are positioned so as to be twisted reintive to the planes of said axes so thatthe unlmpeded dtrect paths in direction wholly across the walls of the blocks are limited to the width of the blocks plus spacing between the blocks.

  15. NUCLEAR REACTOR

    DOEpatents

    Grebe, J.J.

    1961-01-24

    A core structure for neutronic reactors adapted for the propulsion of aircraft and rockets is offered. The core is designed for cooling by gaseous media, and comprises a plurality of hollow tapered tubular segments of a porous moderating material impregniated with fissionable fuel nested about a common axis. Alternate ends of the segments are joined. In operation a coolant gas passes through the porous structure and is heated.

  16. NUCLEAR REACTORS

    DOEpatents

    Koch, L.J.; Rice, R.E. Jr.; Denst, A.A.; Rogers, A.J.; Novick, M.

    1961-12-01

    An active portion assembly for a fast neutron reactor is described wherein physical distortions resulting in adverse changes in the volume-to-mass ratio are minimized. A radially expandable locking device is disposed within a cylindrical tube within each fuel subassembly within the active portion assembly, and clamping devices expandable toward the center of the active portion assembly are disposed around the periphery thereof. (AEC)

  17. First results from an iron lidar and a VHF radar at Davis, Antarctica

    NASA Astrophysics Data System (ADS)

    Luebken, F.; Morris, R. J.; Hoeffner, J.; Kaifler, B.; Viehl, T.

    2012-12-01

    We present temperature measurements at Davis, Antarctica (69°S, 78°E), and compare with simultaneous and co-located radar measurements of polar mesosphere summer echoes (PMSE). The mobile scanning iron lidar of the IAP in Kuehlungsborn was installed at Davis in December 2010. It measures iron densities, vertical winds, and temperatures in the iron layer, i. e. from approximately 80 to 100 km. It is based on probing the Doppler broadened resonance line of iron atoms at 386 nm and can operate under daylight conditions. Typical values for temperature uncertainty, altitude and time resolution are 3-5 K, 1 km, and 1 hour, respectively. The lidar also measures neutral air densities and temperatures in the stratosphere and lower mesosphere. At Davis the lidar has up to now achieved approximately 2700 hours of data which is presumably the largest nearly continuous data set in Antarctica. The mesopause altitude changes throughout the summer season by several kilometers, significantly different from the northern hemisphere summer. Depending on altitude, temperatures can be warmer or colder compared to the NH summer. Temperatures at Davis near 86 km are rather similar to the NH, but they are much colder at higher altitudes. The thermal structure around the mesopause at Davis is closely related to the general circulation in the stratosphere, namely to the transition from winter to summer conditions. Different from expectations we sometimes find the mesopause significantly higher and colder(!) compared to the NH. Furthermore, we find large thermal tides in the summer months with amplitudes of up to 6-7~K, which is much larger than expected from models. The Australien Antarctic Division operates a 55 MHz VHF radar at Davis since February 2003. We report first simultaneous measurements of PMSE and temperatures by the Fe lidar. PMSE are strong radar echoes related to ice particles and therefore require atmospheric temperatures being lower than the frost point temperature

  18. The Davis Strait crust—a transform margin between two oceanic basins

    NASA Astrophysics Data System (ADS)

    Suckro, Sonja K.; Gohl, Karsten; Funck, Thomas; Heyde, Ingo; Schreckenberger, Bernd; Gerlings, Joanna; Damm, Volkmar

    2013-04-01

    The Davis Strait is located between Canada and Greenland and connects the Labrador Sea and the Baffin Bay basins. Both basins formed in Cretaceous to Eocene time and were connected by a transform fault system in the Davis Strait. Whether the crust in the central Davis Strait is oceanic or continental has been disputed. This information is needed to understand the evolution of this transform margin during the separation of the North American plate and Greenland. We here present a 315-km-long east-west-oriented profile that crosses the Davis Strait and two major transform fault systems-the Ungava Fault Complex and the Hudson Fracture Zone. By forward modelling of data from 12 ocean bottom seismographs, we develop a P-wave velocity model. We compare this model with a density model from ship-borne gravity data. Seismic reflection and magnetic anomaly data support and complement the interpretation. Most of the crust is covered by basalt flows that indicate extensive volcanism in the Davis Strait. While the upper crust is uniform, the middle and lower crust are characterized by higher P-wave velocities and densities at the location of the Ungava Fault Complex. Here, P-wave velocities of the middle crust are 6.6 km s-1 and of the lower crust are 7.1 km s-1 compared to 6.3 and 6.8 km s-1 outside this area; densities are 2850 and 3050 kg m-3 compared to 2800 and 2900 kg m-3. We here interpret a 45-km-long section as stretched and intruded crust or as new igneous crust that correlates with oceanic crust in the southern Davis Strait. A high-velocity lower crust (6.9-7.3 km s-1) indicates a high content of mafic material. This mantle-derived material gradually intruded the lower crust of the adjacent continental crust and can be related to the Iceland mantle plume. With plate kinematic modelling, we can demonstrate the importance of two transform fault systems in the Davis Strait: the Ungava Fault Complex with transpression and the Hudson Fracture Zone with pure strike

  19. REACTOR CONTROL

    DOEpatents

    Ruano, W.J.

    1957-12-10

    This patent relates to nuclear reactors of the type which utilize elongited rod type fuel elements immersed in a liquid moderator and shows a design whereby control of the chain reaction is obtained by varying the amount of moderator or reflector material. A central tank for containing liquid moderator and fuel elements immersed therein is disposed within a surrounding outer tank providing an annular space between the two tanks. This annular space is filled with liquid moderator which functions as a reflector to reflect neutrons back into the central reactor tank to increase the reproduction ratio. Means are provided for circulating and cooling the moderator material in both tanks and additional means are provided for controlling separately the volume of moderator in each tank, which latter means may be operated automatically by a neutron density monitoring device. The patent also shows an arrangement for controlling the chain reaction by injecting and varying an amount of poisoning material in the moderator used in the reflector portion of the reactor.

  20. Space reactors

    NASA Astrophysics Data System (ADS)

    Ranken, W. A.

    1983-01-01

    Progress in design studies and technology for the SP-100 Project - successor to the Space Power Advanced Reactor (SPAR) Project - is reported for the period October 1, 1981 to March 31, 1982. The basis for selecting a high-temperature, UO2-fueled, heat-pipe-cooled reactor with a thermoelectric conversion system as the 100/kW-sub e/ reference design has been reviewed. Although no change has been made in the general concept, design studies have been done to investigate various reactor/conversion system coupling methods and core design modifications. Thermal and mechanical finite element modeling and three dimensional Monte Carlo analysis of a core with individual finned fuel elements are reported. Studies of unrestrained fuel irradiation data are discussed that are relevant both to the core modeling work and to the design and fabrication of the first in-pile irradiation test, which is also reported. Work on lithium-filled core heat pipe development is described, including the attainment of 15.6 kW/sub t/ operation at 1525 K for a 2-m-long heat pipe with a 15.7-mm outside diameter. The successful operation of a 5.5-m-long, lightweight potassium/titanium heat pipe at 760 K is described, and test results of a thermoelectric module with GaP-modified SiGe thermoelectric elements are presented.

  1. Nuclear Reactors. Revised.

    ERIC Educational Resources Information Center

    Hogerton, John F.

    This publication is one of a series of information booklets for the general public published by the United States Atomic Energy Commission. Among the topics discussed are: How Reactors Work; Reactor Design; Research, Teaching, and Materials Testing; Reactors (Research, Teaching and Materials); Production Reactors; Reactors for Electric Power…

  2. 42 CFR 137.379 - Do Davis-Bacon wage rates apply to construction projects performed by Self-Governance Tribes...

    Code of Federal Regulations, 2010 CFR

    2010-10-01

    ... HEALTH AND HUMAN SERVICES TRIBAL SELF-GOVERNANCE Construction Other § 137.379 Do Davis-Bacon wage rates apply to construction projects performed by Self-Governance Tribes using Federal funds? Davis-Bacon Act... Tribes to perform construction. The Davis-Bacon Act and wage rates do not apply when...

  3. 25 CFR 1000.407 - Do the wage and labor standards in the Davis-Bacon Act apply to Tribes and Tribal Consortia?

    Code of Federal Regulations, 2010 CFR

    2010-04-01

    ... 25 Indians 2 2010-04-01 2010-04-01 false Do the wage and labor standards in the Davis-Bacon Act....407 Do the wage and labor standards in the Davis-Bacon Act apply to Tribes and Tribal Consortia? No, wage and labor standards of the Davis-Bacon Act do not apply to employees of Tribes and...

  4. 25 CFR 1000.407 - Do the wage and labor standards in the Davis-Bacon Act apply to Tribes and Tribal Consortia?

    Code of Federal Regulations, 2012 CFR

    2012-04-01

    ... 25 Indians 2 2012-04-01 2012-04-01 false Do the wage and labor standards in the Davis-Bacon Act....407 Do the wage and labor standards in the Davis-Bacon Act apply to Tribes and Tribal Consortia? No, wage and labor standards of the Davis-Bacon Act do not apply to employees of Tribes and...

  5. 25 CFR 1000.407 - Do the wage and labor standards in the Davis-Bacon Act apply to Tribes and Tribal Consortia?

    Code of Federal Regulations, 2014 CFR

    2014-04-01

    ... 25 Indians 2 2014-04-01 2014-04-01 false Do the wage and labor standards in the Davis-Bacon Act....407 Do the wage and labor standards in the Davis-Bacon Act apply to Tribes and Tribal Consortia? No, wage and labor standards of the Davis-Bacon Act do not apply to employees of Tribes and...

  6. 25 CFR 1000.407 - Do the wage and labor standards in the Davis-Bacon Act apply to Tribes and Tribal Consortia?

    Code of Federal Regulations, 2011 CFR

    2011-04-01

    ... 25 Indians 2 2011-04-01 2011-04-01 false Do the wage and labor standards in the Davis-Bacon Act....407 Do the wage and labor standards in the Davis-Bacon Act apply to Tribes and Tribal Consortia? No, wage and labor standards of the Davis-Bacon Act do not apply to employees of Tribes and...

  7. 42 CFR 137.379 - Do Davis-Bacon wage rates apply to construction projects performed by Self-Governance Tribes...

    Code of Federal Regulations, 2014 CFR

    2014-10-01

    ... 42 Public Health 1 2014-10-01 2014-10-01 false Do Davis-Bacon wage rates apply to construction... HEALTH AND HUMAN SERVICES TRIBAL SELF-GOVERNANCE Construction Other § 137.379 Do Davis-Bacon wage rates apply to construction projects performed by Self-Governance Tribes using Federal funds? Davis-Bacon...

  8. 42 CFR 137.379 - Do Davis-Bacon wage rates apply to construction projects performed by Self-Governance Tribes...

    Code of Federal Regulations, 2012 CFR

    2012-10-01

    ... 42 Public Health 1 2012-10-01 2012-10-01 false Do Davis-Bacon wage rates apply to construction... HEALTH AND HUMAN SERVICES TRIBAL SELF-GOVERNANCE Construction Other § 137.379 Do Davis-Bacon wage rates apply to construction projects performed by Self-Governance Tribes using Federal funds? Davis-Bacon...

  9. 42 CFR 137.379 - Do Davis-Bacon wage rates apply to construction projects performed by Self-Governance Tribes...

    Code of Federal Regulations, 2013 CFR

    2013-10-01

    ... 42 Public Health 1 2013-10-01 2013-10-01 false Do Davis-Bacon wage rates apply to construction... HEALTH AND HUMAN SERVICES TRIBAL SELF-GOVERNANCE Construction Other § 137.379 Do Davis-Bacon wage rates apply to construction projects performed by Self-Governance Tribes using Federal funds? Davis-Bacon...

  10. 42 CFR 137.379 - Do Davis-Bacon wage rates apply to construction projects performed by Self-Governance Tribes...

    Code of Federal Regulations, 2011 CFR

    2011-10-01

    ... 42 Public Health 1 2011-10-01 2011-10-01 false Do Davis-Bacon wage rates apply to construction... HEALTH AND HUMAN SERVICES TRIBAL SELF-GOVERNANCE Construction Other § 137.379 Do Davis-Bacon wage rates apply to construction projects performed by Self-Governance Tribes using Federal funds? Davis-Bacon...

  11. 25 CFR 1000.407 - Do the wage and labor standards in the Davis-Bacon Act apply to Tribes and Tribal Consortia?

    Code of Federal Regulations, 2013 CFR

    2013-04-01

    ... 25 Indians 2 2013-04-01 2013-04-01 false Do the wage and labor standards in the Davis-Bacon Act....407 Do the wage and labor standards in the Davis-Bacon Act apply to Tribes and Tribal Consortia? No, wage and labor standards of the Davis-Bacon Act do not apply to employees of Tribes and...

  12. Nuclear reactor

    DOEpatents

    Pennell, William E.; Rowan, William J.

    1977-01-01

    A nuclear reactor in which the core components, including fuel-rod assemblies, control-rod assemblies, fertile rod-assemblies, and removable shielding assemblies, are supported by a plurality of separate inlet modular units. These units are referred to as inlet module units to distinguish them from the modules of the upper internals of the reactor. The modular units are supported, each removable independently of the others, in liners in the supporting structure for the lower internals of the reactor. The core assemblies are removably supported in integral receptacles or sockets of the modular units. The liners, units, sockets and assmblies have inlet openings for entry of the fluid. The modular units are each removably mounted in the liners with fluid seals interposed between the opening in the liner and inlet module into which the fluid enters and the upper and lower portion of the liner. Each assembly is similarly mounted in a corresponding receptacle with fluid seals interposed between the openings where the fluid enters and the lower portion of the receptacle or fitting closely in these regions. As fluid flows along each core assembly a pressure drop is produced along the fluid so that the fluid which emerges from each core assembly is at a lower pressure than the fluid which enters the core assembly. However because of the seals interposed in the mountings of the units and assemblies the pressures above and below the units and assemblies are balanced and the units are held in the liners and the assemblies are held in the receptacles by their weights as they have a higher specific gravity than the fluid. The low-pressure spaces between each module and its liner and between each core assembly and its module is vented to the low-pressure regions of the vessel to assure that fluid which leaks through the seals does not accumulate and destroy the hydraulic balance.

  13. NUCLEAR REACTORS

    DOEpatents

    Long, E.; Ashley, J.W.

    1958-12-16

    A graphite moderator structure is described for a gas-cooled nuclear reactor having a vertical orlentation wherein the structure is physically stable with regard to dlmensional changes due to Wigner growth properties of the graphite, and leakage of coolant gas along spaces in the structure is reduced. The structure is comprised of stacks of unlform right prismatic graphite blocks positioned in layers extending in the direction of the lengths of the blocks, the adjacent end faces of the blocks being separated by pairs of tiles. The blocks and tiles have central bores which are in alignment when assembled and are provided with cooperatlng keys and keyways for physical stability.

  14. ELECTRONUCLEAR REACTOR

    DOEpatents

    Lawrence, E.O.; McMillan, E.M.; Alvarez, L.W.

    1960-04-19

    An electronuclear reactor is described in which a very high-energy particle accelerator is employed with appropriate target structure to produce an artificially produced material in commercial quantities by nuclear transformations. The principal novelty resides in the combination of an accelerator with a target for converting the accelerator beam to copious quantities of low-energy neutrons for absorption in a lattice of fertile material and moderator. The fertile material of the lattice is converted by neutron absorption reactions to an artificially produced material, e.g., plutonium, where depleted uranium is utilized as the fertile material.

  15. REACTOR COMPONETN

    DOEpatents

    Creutz, E.C.

    1959-10-27

    A reactor fuel element comprised of a slug of fissionable material disposed in a sheath of corrosion resistantmaterial is described. The sheath is in the form of a tubular container closed at one end and is in tight-fitting engagement with the peripheral sunface of the slug. An inner cap is insented into the open end of the sheath against the slug, which end is then bent around the inner cap and welded thereto. An outer cap is then welded around its peripheny to the bent portion of the container.

  16. Photocatalytic reactor

    DOEpatents

    Bischoff, B.L.; Fain, D.E.; Stockdale, J.A.D.

    1999-01-19

    A photocatalytic reactor is described for processing selected reactants from a fluid medium comprising at least one permeable photocatalytic membrane having a photocatalytic material. The material forms an area of chemically active sites when illuminated by light at selected wavelengths. When the fluid medium is passed through the illuminated membrane, the reactants are processed at these sites separating the processed fluid from the unprocessed fluid. A light source is provided and a light transmitting means, including an optical fiber, for transmitting light from the light source to the membrane. 4 figs.

  17. Stratosphere/mesosphere coupling during the winter/summer transition at Davis, Antarctica

    NASA Astrophysics Data System (ADS)

    Lübken, Franz-Josef; Höffner, Josef; Viehl, Timo P.; Becker, Erich; Latteck, Ralph; Kaifler, Bernd; Morris, Ray J.

    2015-04-01

    The mobile scanning iron lidar of the Leibniz Institute of Atmospheric Physics in Kühlungsborn (IAP) was in operation at Davis, Antarctica, from December 15, 2010, until December 31, 2012. It measured iron densities, vertical winds, and temperatures in the iron layer, i. e. from approximately 80 to 100 km. The measurement principle is based on probing the Doppler broadened resonance line of iron atoms at 386 nm. The lidar can operate under daylight conditions. Typical values for temperature uncertainty, altitude and time resolution are 3-5 K, 1 km, and 1 hour, respectively. At Davis, the lidar has achieved at total of 2900 hours of temperature measurements which is presumably the largest nearly continuous data set in Antarctica. In this presentation we concentrate on the winter/summer transition in three consecutive years and compare with circulation changes in the stratosphere derived from MERRA (NASA's Modern-Era Retrospective analysis for Research and Applications). We also compare with the northern hemisphere (NH). We find that the thermal structure around the mesopause at Davis is closely coupled to the general circulation in the stratosphere, more precisely to the transition from winter to summer conditions. In contrast to theoretical expectations we occasionally find the mesopause significantly higher and colder(!) compared to the NH. The mesopause altitude changes by several kilometers throughout the summer season, which is significantly different from the summer in the northern hemispheric. Depending on altitude, temperatures can be warmer or colder compared to the NH summer. The Australian Antarctic Division has been operating a 55 MHz VHF radar at Davis since February 2003. We have studied the seasonal variation of polar mesosphere summer echoes (PMSE). PMSE are strong radar echoes related to ice particles and therefore require atmospheric temperatures lower than the frost point temperature. We note that (apart from low temperatures) more ingredients

  18. Hybrid adsorptive membrane reactor

    NASA Technical Reports Server (NTRS)

    Tsotsis, Theodore T. (Inventor); Sahimi, Muhammad (Inventor); Fayyaz-Najafi, Babak (Inventor); Harale, Aadesh (Inventor); Park, Byoung-Gi (Inventor); Liu, Paul K. T. (Inventor)

    2011-01-01

    A hybrid adsorbent-membrane reactor in which the chemical reaction, membrane separation, and product adsorption are coupled. Also disclosed are a dual-reactor apparatus and a process using the reactor or the apparatus.

  19. Hybrid adsorptive membrane reactor

    DOEpatents

    Tsotsis, Theodore T [Huntington Beach, CA; Sahimi, Muhammad [Altadena, CA; Fayyaz-Najafi, Babak [Richmond, CA; Harale, Aadesh [Los Angeles, CA; Park, Byoung-Gi [Yeosu, KR; Liu, Paul K. T. [Lafayette Hill, PA

    2011-03-01

    A hybrid adsorbent-membrane reactor in which the chemical reaction, membrane separation, and product adsorption are coupled. Also disclosed are a dual-reactor apparatus and a process using the reactor or the apparatus.

  20. Control Means for Reactor

    DOEpatents

    Manley, J. H.

    1961-06-27

    An apparatus for controlling a nuclear reactor includes a tank just below the reactor, tubes extending from the tank into the reactor, and a thermally expansible liquid neutron absorbent material in the tank. The liquid in the tank is exposed to a beam of neutrons from the reactor which heats the liquid causing it to expand into the reactor when the neutron flux in the reactor rises above a predetermincd danger point. Boron triamine may be used for this purpose.

  1. Late-time structure of the Bunch-Davies de Sitter wavefunction

    SciTech Connect

    Anninos, Dionysios; Anous, Tarek; Freedman, Daniel Z.; Konstantinidis, George

    2015-11-30

    We examine the late time behavior of the Bunch-Davies wavefunction for interacting light fields in a de Sitter background. We use perturbative techniques developed in the framework of AdS/CFT, and analytically continue to compute tree and loop level contributions to the Bunch-Davies wavefunction. We consider self-interacting scalars of general mass, but focus especially on the massless and conformally coupled cases. We show that certain contributions grow logarithmically in conformal time both at tree and loop level. We also consider gauge fields and gravitons. The four-dimensional Fefferman-Graham expansion of classical asymptotically de Sitter solutions is used to show that the wavefunction contains no logarithmic growth in the pure graviton sector at tree level. Finally, assuming a holographic relation between the wavefunction and the partition function of a conformal field theory, we interpret the logarithmic growths in the language of conformal field theory.

  2. Late-time structure of the Bunch-Davies de Sitter wavefunction

    SciTech Connect

    Anninos, Dionysios; Freedman, Daniel Z.; Konstantinidis, George; Anous, Tarek E-mail: tanous@mit.edu E-mail: cgcoss@stanford.edu

    2015-11-01

    We examine the late time behavior of the Bunch-Davies wavefunction for interacting light fields in a de Sitter background. We use perturbative techniques developed in the framework of AdS/CFT, and analytically continue to compute tree and loop level contributions to the Bunch-Davies wavefunction. We consider self-interacting scalars of general mass, but focus especially on the massless and conformally coupled cases. We show that certain contributions grow logarithmically in conformal time both at tree and loop level. We also consider gauge fields and gravitons. The four-dimensional Fefferman-Graham expansion of classical asymptotically de Sitter solutions is used to show that the wavefunction contains no logarithmic growth in the pure graviton sector at tree level. Finally, assuming a holographic relation between the wavefunction and the partition function of a conformal field theory, we interpret the logarithmic growths in the language of conformal field theory.

  3. Sixteen years of collaborative learning through active sense-making in physics (CLASP) at UC Davis

    NASA Astrophysics Data System (ADS)

    Potter, Wendell; Webb, David; Paul, Cassandra; West, Emily; Bowen, Mark; Weiss, Brenda; Coleman, Lawrence; De Leone, Charles

    2014-02-01

    This paper describes our large reformed introductory physics course at UC Davis, which bioscience students have been taking since 1996. The central feature of this course is a focus on sense-making by the students during the 5 h per week discussion/labs in which the students take part in activities emphasizing peer-peer discussions, argumentation, and presentations of ideas. The course differs in many fundamental ways from traditionally taught introductory physics courses. After discussing the unique features of CLASP and its implementation at UC Davis, various student outcome measures are presented that show increased performance by students who took the CLASP course compared to students who took a traditionally taught introductory physics course. Measures we use include upper-division GPAs, MCAT scores, FCI gains, and MPEX-II scores.

  4. Ground water in the East Shore area, Utah. Part I. Bountiful District, Davis County

    USGS Publications Warehouse

    Thomas, H.E.; Nelson, W.B.

    1948-01-01

    The Bountiful district in Davis County, Utah, less than 10 miles from the heart of Salt Lake City, is rapidly becoming an integral part of the metropolitan area of Salt Lake City. It cannot achieve the development that its location merits unless the present water supplies are increased. The district is a fertile agricultural area favorably situated between the largest cities in the intermountain area and athwart the major routes of transportation and communication, but development of its residential, industrial, and agricultural potentialities will be restricted until existing water resources are supplemented by importation from other drainage basins that now have surplus water supplies. This conclusion is reached in the accompanying report by the Geological Survey, prepared in cooperation with the Utah State Engineer and the Davis County Water Users Association, and based on a 2-year investigation of the existing water supplies

  5. STS-47 MS Davis and MS/PLC Lee inspect SLJ Rack 5 during KSC training

    NASA Technical Reports Server (NTRS)

    1992-01-01

    STS-47 Endeavour, Orbiter Vehicle (OV) 105, Mission Specialist N. Jan Davis and MS and Payload Commander (PLC) Mark C. Lee, wearing clean suits, check latches on the Spacelab Japan (SLJ) Rack 5 Adult Frog Compartment during an inspection of the SLJ module which is currently undergoing preflight processing in a high bay of the Kennedy Space Center's (KSC's) Orbiter Processing Facility (OPF). View provided by KSC with alternate KSC number KSC-92PC-1643.

  6. STS-47 MS Davis and MS/PLC Lee during JSC bailout training

    NASA Technical Reports Server (NTRS)

    1992-01-01

    STS-47 Endeavour, Orbiter Vehicle (OV) 105, Mission Specialist (MS) N. Jan Davis (left) and MS and Payload Commander (PLC) Mark C. Lee take a break from bailout (launch egress training) held in JSC's Mockup and Training Laboratory (MAIL) Bldg 9A. The two crewmembers, wearing launch and entry suits (LESs) and communications carrier assemblies (CCAs), are standing in front of the crew compartment trainer (CCT).

  7. STS-47 MS Davis and MS/PLC Lee examine SLJ Rack 10 during KSC inspection

    NASA Technical Reports Server (NTRS)

    1992-01-01

    STS-47 Endeavour, Orbiter Vehicle (OV) 105, Mission Specialist N. Jan Davis and MS and Payload Commander (PLC) Mark C. Lee, wearing clean suits, examine NASDA Material Sciences control panel on Spacelab Japan (SLJ) Rack 10 during an inspection of the SLJ module. The module is currently undergoing preflight processing in a high bay of the Kennedy Space Center's (KSC's) Orbiter Processing Facility (OPF). View provided by KSC with alternate KSC number KSC-92PC-1644.

  8. Draft Environmental Analysis for the Realignment of Forces at Davis- Monthan Air Force Base, Arizona

    DTIC Science & Technology

    1989-08-01

    secondary job market workforce in Pima County and was not considered significant. A similar effect on the housing market of less than 0.3 percent was also...PROPOSED ACTION 1.1 PROJECT LOCATION Davis-Monthan Air Force Base, (AFB) is located adjacent to the city of Tucson, in Pima County , Arizona...for the areas within the access boundary. " Changes in the approved Pima County Comprehensive Plan reflect an awareness of aircraft/land use

  9. STS-47 MS Davis and MS/PLC Lee during JSC bailout training

    NASA Technical Reports Server (NTRS)

    1992-01-01

    STS-47 Endeavour, Orbiter Vehicle (OV) 105, Mission Specialist (MS) N. Jan Davis (left) and MS and Payload Commander (PLC) Mark C. Lee take a break from bailout (launch egress training) held in JSC's Mockup and Training Laboratory (MAIL) Bldg 9A. The two crewmembers, wearing launch and entry suits (LESs) and communications carrier assemblies (CCAs), are standing in front of the crew compartment trainer (CCT).

  10. STS-47 MS Davis and MS/PLC Lee examine SLJ Rack 10 during KSC inspection

    NASA Technical Reports Server (NTRS)

    1992-01-01

    STS-47 Endeavour, Orbiter Vehicle (OV) 105, Mission Specialist N. Jan Davis and MS and Payload Commander (PLC) Mark C. Lee, wearing clean suits, examine NASDA Material Sciences control panel on Spacelab Japan (SLJ) Rack 10 during an inspection of the SLJ module. The module is currently undergoing preflight processing in a high bay of the Kennedy Space Center's (KSC's) Orbiter Processing Facility (OPF). View provided by KSC with alternate KSC number KSC-92PC-1644.

  11. Revised List of Type Specimens on Deposit in the University of California Davis Nematode Collection

    PubMed Central

    Stock, S. Patricia; Nadler, Steven A.

    1998-01-01

    The list of deposited type specimens is updated for the University of California Davis Nematode Collection, as recommended by the International Code of Zoological Nomenclature. The type collection includes 1,001 species and more than 11,000 individual specimens mounted on microscope slides. This list can be used as a reference to locate specimens but is not meant to clarify ambiguities that may exist concerning the type status of particular specimens. PMID:19274230

  12. NEUTRONIC REACTOR

    DOEpatents

    Stewart, H.B.

    1958-12-23

    A nuclear reactor of the type speclfically designed for the irradiation of materials is discussed. In this design a central cyllndrical core of moderating material ls surrounded by an active portlon comprlsed of an annular tank contalning fissionable material immersed ln a liquid moderator. The active portion ls ln turn surrounded by a reflector, and a well ls provided in the center of the core to accommodate the materlals to be irradiated. The over-all dimensions of the core ln at least one plane are equal to or greater than twice the effective slowing down length and equal to or less than twlce the effective diffuslon length for neutrons in the core materials.

  13. NEUTRONIC REACTOR

    DOEpatents

    Daniels, F.

    1962-12-18

    A power plant is described comprising a turbine and employing round cylindrical fuel rods formed of BeO and UO/sub 2/ and stacks of hexagonal moderator blocks of BeO provided with passages that loosely receive the fuel rods so that coolant may flow through the passages over the fuels to remove heat. The coolant may be helium or steam and fiows through at least one more heat exchanger for producing vapor from a body of fluid separate from the coolant, which fluid is to drive the turbine for generating electricity. By this arrangement the turbine and directly associated parts are free of particles and radiations emanating from the reactor. (AEC)

  14. NEUTRONIC REACTOR

    DOEpatents

    McGarry, R.J.

    1958-04-22

    Fluid-cooled nuclear reactors of the type that utilize finned uranium fuel elements disposed in coolant channels in a moderater are described. The coolant channels are provided with removable bushings composed of a non- fissionable material. The interior walls of the bushings have a plurality of spaced, longtudinal ribs separated by grooves which receive the fins on the fuel elements. The lands between the grooves are spaced from the fuel elements to form flow passages, and the size of the now passages progressively decreases as the dlstance from the center of the core increases for the purpose of producing a greater cooling effect at the center to maintain a uniform temperature throughout the core.

  15. Nuclear reactor neutron shielding

    DOEpatents

    Speaker, Daniel P; Neeley, Gary W; Inman, James B

    2017-09-12

    A nuclear reactor includes a reactor pressure vessel and a nuclear reactor core comprising fissile material disposed in a lower portion of the reactor pressure vessel. The lower portion of the reactor pressure vessel is disposed in a reactor cavity. An annular neutron stop is located at an elevation above the uppermost elevation of the nuclear reactor core. The annular neutron stop comprises neutron absorbing material filling an annular gap between the reactor pressure vessel and the wall of the reactor cavity. The annular neutron stop may comprise an outer neutron stop ring attached to the wall of the reactor cavity, and an inner neutron stop ring attached to the reactor pressure vessel. An excore instrument guide tube penetrates through the annular neutron stop, and a neutron plug comprising neutron absorbing material is disposed in the tube at the penetration through the neutron stop.

  16. Environmental Survey preliminary report, Laboratory for Energy-Related Health Research, Davis, California

    SciTech Connect

    Not Available

    1988-03-01

    This report presents the preliminary findings from the first phase of the Survey of the United States Department of Energy (DOE) Laboratory for Energy-Related Health Research (LEHR) at the University of California, Davis (UC Davis), conducted November 16 through 20, 1987. The Survey is being conducted by an interdisciplinary team of environmental specialists, led and managed by the Office of Environment, Safety and Health's Office of Environmental Audit. Individual team components are being supplied by a private contractor. The objective of the Survey is to identify environmental problems and areas of environmental risk associated with the LEHR. The Survey covers all environmental media and all areas of environmental regulation, and is being performed in accordance with the DOE Environmental Survey Manual. This phase of the Survey involves the review of existing site environmental data, observations of the operations at the LEHR and interviews with site personnel. The Survey team developed a Sampling and Analysis Plan to assist in further assessing certain of the environmental problems identified during its on-site activities. The Sampling and Analysis Plan will be executed by a DOE National Laboratory or a support contractor. When completed, the results will be incorporated into the Environmental Survey Interim Report for the LEHR at UC Davis. The Interim Report will reflect the final determinations of the LEHR Survey. 75 refs., 26 figs., 23 tabs.

  17. Vegetative communities, Davis and Lavender Canyons, Paradox Basin, Utah: ecosystem studies

    SciTech Connect

    Not Available

    1983-04-01

    The major vegetative communities of Davis and Lavender canyons located in southeastern Utah are characterized. The report identifies potential secondary impacts and appropriate mitigation options. The Davis Canyon and Lavender Canyon Study Area contains nine major vegetative communities: galleta-shadscale, juniper-blackbrush, juniper-shadscale-ephedra, shadscale-ephedra, grayia-shadscale, juniper, drywash, greasewood, and riparian. The natural recovery times of these communities are exceedingly long. Natural reinvasion of various species would take from 15 to 100 years. No threatened or endangered plant species were identified in the study area. Davis and Lavender canyons have been subject to off-road vehicle activity and extensive grazing. The plant communities may be subject to additional impacts as a result of increased human activity and off-highway activities such as camping, hiking, and hunting could result in changes in cover, composition, and frequency of plant species. Mitigation options for potential impacts include shuttle-busing workers to the site from the highway and fencing site access roads to prevent vehicles from leaving the roads.

  18. Reactor and method of operation

    DOEpatents

    Wheeler, John A.

    1976-08-10

    A nuclear reactor having a flattened reactor activity curve across the reactor includes fuel extending over a lesser portion of the fuel channels in the central portion of the reactor than in the remainder of the reactor.

  19. Nuclear reactor

    DOEpatents

    Yant, Howard W.; Stinebiser, Karl W.; Anzur, Gregory C.

    1977-01-01

    A nuclear reactor, particularly a liquid-metal breeder reactor, whose upper internals include outlet modules for channeling the liquid-metal coolant from selected areas of the outlet of the core vertically to the outlet plenum. The modules are composed of a highly-refractory, high corrosion-resistant alloy, for example, INCONEL-718. Each module is disposed to confine and channel generally vertically the coolant emitted from a subplurality of core-component assemblies. Each module has a grid with openings, each opening disposed to receive the coolant from an assembly of the subplurality. The grid in addition serves as a holdown for the assemblies of the corresponding subplurality preventing their excessive ejection upwardly from the core. In the region directly over the core the outlet modules are of such peripheral form that they nest forming a continuum over the core-component assemblies whose outlet coolant they confine. Each subassembly includes a chimney which confines the coolant emitted by its corresponding subassemblies to generally vertical flow between the outlet of the core and the outlet plenum. Each subplurality of assemblies whose emitted coolant is confined by an outlet module includes assemblies which emit lower-temperature coolant, for example, a control-rod assembly, or fertile assemblies, and assemblies which emit coolant of substantially higher temperature, for example, fuel-rod assemblies. The coolants of different temperatures are mixed in the chimneys reducing the effect of stripping (hot-cold temperature fluctuations) on the remainder of the upper internals which are composed typically of AISI-304 or AISI-316 stainless steel.

  20. 33 CFR 100.1102 - Marine Events on the Colorado River, between Davis Dam (Bullhead City, Arizona) and Headgate Dam...

    Code of Federal Regulations, 2010 CFR

    2010-07-01

    ..., Nevada, from the Pioneer Hotel to the Edgewater Hotel. Laughlin Aquamoto Sports Challenge and Expo.... PDT. Where: That portion of the Colorado River near Laughlin, Nevada, from Davis Dam to Harrah's Hotel...

  1. 75 FR 7628 - Davis-Besse Nuclear Power Station; Notice of Consideration of Issuance of Amendment to Facility...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2010-02-22

    ... COMMISSION Davis-Besse Nuclear Power Station; Notice of Consideration of Issuance of Amendment to Facility Operating License, Proposed No Significant Hazards Consideration Determination, and Opportunity for a... determination that the amendment request involves no significant hazards consideration. Under the...

  2. The Davie Ridge, Northern Mozambique: The Crustal Structure from Wide-angle Seismic Data

    NASA Astrophysics Data System (ADS)

    Baetzel, M.; Franke, D.; Heyde, I.; Schreckenberger, B.; Jokat, W.

    2015-12-01

    The breakup of Gondwana created the Somali and the Mozambique basins, two of the oldest ocean basins on earth. The relative movements between Africa and Antarctica-India-Madagascar created a sheared margin along the present day coastline of northern Mozambique and Tanzania. The N-S oriented offshore Davie Ridge is believed to have formed during these shear movements. Whether the Davie Ridge is of continental origin or has been formed by magmatic processes during the continental drift is unknown, because deep seismic sounding data are missing to describe the crustal fabric. Previous geophysical studies in this area are rare. From the 1970s and 1980s mainly seismic reflection data were acquired by French institutions across the ridge. Few dredge samples provided first evidence for a continental origin of the southern Davie Ridge.In 2014, four east-west-orientated seismic refraction profiles as well as gravity and magnetic field data were collected across the Davie Ridge. Here, we present two P-wave velocity models across the Mozambican margin. The profiles are situated in the northern part (11.5° S) of the Davie Ridge and the transition (13° S) to the southern part where the topography vanishes. Each profile consists of 20 OBS/OBH systems with a spacing of about 9.5 km. Along both profiles the total thickness of the sediments is about 5 km. The sediments show unusual high seismic velocities of 4.0-4.6 km/s below 3 to 4 km depth. In the northern profile, east of the Kerimbas Basin the crust is about 6 km thick with velocities from 5.5 to 6.6 km/s, which is most likely of oceanic origin. Towards the Mozambican coast the crust thickens to 15 km. The data indicate that the transition from stretched continental to oceanic crust is below the Kerimbas Basin. The southern profile shows a thinned crust (4 km) close to the shelf break. In the East, the crustal thickness is similar to the northern profile with slightly higher velocities up to 6.8 km/s.

  3. Reactor safety method

    DOEpatents

    Vachon, Lawrence J.

    1980-03-11

    This invention relates to safety means for preventing a gas cooled nuclear reactor from attaining criticality prior to start up in the event the reactor core is immersed in hydrogenous liquid. This is accomplished by coating the inside surface of the reactor coolant channels with a neutral absorbing material that will vaporize at the reactor's operating temperature.

  4. Nuclear reactor

    DOEpatents

    Thomson, Wallace B.

    2004-03-16

    A nuclear reactor comprising a cylindrical pressure vessel, an elongated annular core centrally disposed within and spaced from the pressure vessel, and a plurality of ducts disposed longitudinally of the pressure vessel about the periphery thereof, said core comprising an annular active portion, an annular reflector just inside the active portion, and an annular reflector just outside the active a portion, said annular active portion comprising rectangular slab, porous fuel elements radially disposed around the inner reflector and extending the length of the active portion, wedge-shaped, porous moderator elements disposed adjacent one face of each fuel element and extending the length of the fuel element, the fuel and moderator elements being oriented so that the fuel elements face each other and the moderator elements do likewise, adjacent moderator elements being spaced to provide air inlet channels, and adjacent fuel elements being spaced to provide air outlet channels which communicate with the interior of the peripheral ducts, and means for introducing air into the air inlet channels which passes through the porous moderator elements and porous fuel elements to the outlet channel.

  5. Identification of hyper-extended crust east of Davie Ridge in the Mozambique Channel

    NASA Astrophysics Data System (ADS)

    Klimke, Jennifer; Franke, Dieter

    2015-04-01

    Davie Ridge is a ~1200 km wide, N-S trending bathymetrical high in the Mozambique Channel. Today, it is widely accepted that Davie Ridge is located along a fossil transform fault that was active during the Middle Jurassic and Early Cretaceous (~165-120 Ma). This transform fault results from the breakup of Gondwana, when Madagascar (together with India and Antarctica) drifted from its northerly position in the Gondwana Supercontinent (adjacent to the coasts of Tanzania, Somalia and Kenya) to its present position (e.g. Coffin and Rabinowitz, 1987; Rabinowitz et al., 1983; Segoufin and Patriat, 1980). The southward motion of Madagascar relative to Africa is constrained by the interpretation of magnetic anomalies in the Western Somali Basin, located north of Madagascar (e.g. Rabinowitz et al., 1983). According to Bird (2001), sheared margins share typical characteristics and a common evolution: 1. The transition from continental to oceanic crust is relatively abrupt (~ 50-80 km). 2. Along the continental side of the margin, complex rift basins form that display a wide range of faults. 3. Prominent marginal ridges form along the sheared margin that probably originate from the propagation of the oceanic spreading center along the plate boundary (Bird, 2001). In February and March 2014, a dense geophysical dataset (multichannel seismic, magnetics, gravimetry and bathymetry) with a total of 4300 profile km along the sheared margin was acquired with the R/V Sonne by the Federal Institute for Geosciences and Natural Resources (BGR). A special objective of the project, amongst others, is the characterization and interpretation of the continent-ocean transition seaward of Davie Ridge in the Mozambique Channel. Seismic profiles located east of Davie Ridge in the Western Somali Basin reveal a wide sequence of half-grabens bounded by listric normal faults. We tentatively suggest that this crust is of continental origin and results from rifting between Africa and Madagascar during

  6. Population ecology of polar bears in Davis Strait, Canada and Greenland

    USGS Publications Warehouse

    Peacock, Elizabeth; Taylor, Mitchell K.; Laake, Jeffrey L.; Stirling, Ian

    2013-01-01

    Until recently, the sea ice habitat of polar bears was understood to be variable, but environmental variability was considered to be cyclic or random, rather than progressive. Harvested populations were believed to be at levels where density effects were considered not significant. However, because we now understand that polar bear demography can also be influenced by progressive change in the environment, and some populations have increased to greater densities than historically lower numbers, a broader suite of factors should be considered in demographic studies and management. We analyzed 35 years of capture and harvest data from the polar bear (Ursus maritimus) subpopulation in Davis Strait, including data from a new study (2005–2007), to quantify its current demography. We estimated the population size in 2007 to be 2,158 ± 180 (SE), a likely increase from the 1970s. We detected variation in survival, reproductive rates, and age-structure of polar bears from geographic sub-regions. Survival and reproduction of bears in southern Davis Strait was greater than in the north and tied to a concurrent dramatic increase in breeding harp seals (Pagophilus groenlandicus) in Labrador. The most supported survival models contained geographic and temporal variables. Harp seal abundance was significantly related to polar bear survival. Our estimates of declining harvest recovery rate, and increasing total survival, suggest that the rate of harvest declined over time. Low recruitment rates, average adult survival rates, and high population density, in an environment of high prey density, but deteriorating and variable ice conditions, currently characterize the Davis Strait polar bears. Low reproductive rates may reflect negative effects of greater densities or worsening ice conditions.

  7. Addressing the urban pipeline challenge for the physician workforce: the Sophie Davis model.

    PubMed

    Roman, Stanford A

    2004-12-01

    The convergence of numerous trends indicates that a physician shortage by 2020 is likely. There is a 25% growth in the overall population, but that of the college-age sector is increasing by only 5%. The numbers of African Americans and Latinos in that sector will increase more than will members of other population groups; these two groups are most affected by the uneven quality of science education in urban high schools. Challenges to create a pipeline of a large, diverse, and qualified pool of medical school applicants are great, and are influenced by the actual and perceived cost of medical school tuition and the competition from other professions. Since 1973, the Sophie Davis School of Biomedical Education, a seven-year joint BS/MD program, has expanded access to medical school education for talented inner-city youths, including minorities and those with limited financial resources. Students receive a BS degree and their first two years of medical school education and, upon successful completion of the United States Medical Licensing Examination Step 1, transfer to one of five cooperating medical schools in New York State that confer the terminal MD degree. Sophie Davis integrates medical studies in the baccalaureate program, using actual performance in medical studies as a predictor of success. Of the more than 1,400 of its graduates, 25% are African American, 8% are Latino, 28% are Asian American, and 39% are white. Over 25% of its current student body comes from federally defined low-income families, and almost three-quarters qualify for New York State financial aid. The Sophie Davis School of Biomedical Education is a model that offers a partial response to those factors that will challenge the achievement of an adequate supply of physicians for our urban communities. The author describes the model in detail and explains how it helps talented but unevenly educated students rise to the challenge of a medical education.

  8. STS-47 MS Davis and Pilot Brown repair ISAIAH humidity problem aboard OV-105

    NASA Image and Video Library

    1992-09-20

    STS047-35-022 (12 - 20 Sept 1992) --- Astronauts Curtis L. Brown, Jr., pilot, and N. Jan Davis, mission specialist, team up to cure a high humidity problem in the hornet experiment in the Spacelab-J Science Module of the Earth-orbiting Space Shuttle Endeavour. Via a jury-rigged hose hook-up, the two were able to blow air from a spacesuit fan into the experiment, thus eliminating condensation that obscured the viewing of the Israeli hornet experiment. The experiment examined the effects of microgravity on the orientation, reproductive capability and social activity of 180 female Oriental Hornets.

  9. STS-47 MS Davis and Pilot Brown monitor ISAIAH on OV-105's middeck

    NASA Image and Video Library

    1992-09-20

    STS047-02-018 (12 - 20 Sept 1992) --- Astronauts N. Jan Davis, mission specialist, and Curtis L. Brown, Jr., pilot, oversee the progress of some of the 180 female Oriental Hornets onboard the Space Shuttle Endeavour. The insects are part of the Israeli Space Agency Investigation About Hornets (ISAIAH) experiment. The objective of this experiment is to examine the effects of microgravity on the orientation, reproductive capability and social activity of the hornets. Also, the direction of comb-building by hornet workers in microgravity, as well as the structural integrity of the combs, will be examined.

  10. Remedial Investigation/Feasibility Study (RI/FS) Report, Davis Global Communications Site. Volume 3

    DTIC Science & Technology

    1994-02-23

    A&AnMJ , M11" DAVIS, CALIFORNIA 4-2 LAN* ANO WA., ,c,, LOG OF BORING NO. B-1 PROJECT NO. W-1003-1 , Grass F 2 SANDY SILT: brown, trace gravel, dry ...NOSC - 2 4 6 0 B-2 SILT: brown, little clay, little sand, ppmv 36 5-A hard, low plasticity, dry , NOSC 8 SILTY CLAY 10 12 14 CL 60 B-2 SILTY CLAY...dense, dry , NOSC 2s6 ppmv 43 25-A 28 SP 30 0 B-2 same as above: little silt, very dense ppUv 62 30-A J.H. KLEINFELDER & ASSOCIATES m I MCCLELLAN AFS

  11. Remedial Investigation/Feasibility Study Report, Davis Global Communications Site. Volume 1

    DTIC Science & Technology

    1994-02-23

    AD-A277 523 11111 111i II II111! 1 1111 iii11111 Sjjj jIII I I Fll II lll ’l"ll II tI ’• • •’ ; "• .. - - - ,McCbelanAir Force Base Davis Global...nvironmental Restoration Division Environmental Management Directorate Attachment: Acc.cn Fr 1 . Distribution 2. Document ... DI, 94-09206 I -i... I...the official position of the Air Force. S ( RDDt0012A46.WPS (Davs RIi/FS) . 1 V [Draft Proposed Plan Distribution List Interpretive Reports (Coordination

  12. Davis-Beirut reaction: route to thiazolo-, thiazino-, and thiazepino-2H-indazoles.

    PubMed

    Farber, Kelli M; Haddadin, Makhluf J; Kurth, Mark J

    2014-08-01

    Methods for the construction of thiazolo-, thiazino-, and thiazepino-2H-indazoles from o-nitrobenzaldehydes or o-nitrobenzyl bromides and S-trityl-protected 1°-aminothioalkanes are reported. The process consists of formation of the requisite N-(2-nitrobenzyl)(tritylthio)alkylamine, subsequent deprotection of the trityl moiety with TFA, and immediate treatment with aq. KOH in methanol under Davis-Beirut reaction conditions to deliver the target thiazolo-, thiazino-, or thiazepino-2H-indazole in good overall yield. Subsequent S-oxidation gives the corresponding sulfone.

  13. STS-47 MS Davis and Pilot Brown monitor ISAIAH on OV-105's middeck

    NASA Technical Reports Server (NTRS)

    1992-01-01

    STS-47 Mission Specialist (MS) N. Jan Davis (left) and Pilot Curtis L. Brown, Jr, monitor the Israel Space Agency Investigation About Hornets (ISAIAH) on the middeck of Endeavour, Orbiter Vehicle (OV) 105. ISAIAH, an enclosure located in locker MF43H, contains 180 female Oriental Hornets and will examine the effects of microgravity on the orientation, reproductive capability and social activity of the hornets. Also, the direction of comb-building by hornet workers in microgravity, as well as the structural integrity of the combs, will be examined.

  14. STS-47 MS Davis uses SLJ Rack 8 continuous heating furnace (CHF) on OV-105

    NASA Image and Video Library

    1992-09-20

    STS047-02-003 (12 - 20 Sept 1992) --- Astronaut N. Jan Davis, mission specialist, works at the Continuous Heating Furnace (CHF) in the Spacelab-J Science Module. This furnace provided temperatures up to 1,300 degrees Celsius and rapid cooling to two sets of samples concurrently. The furnace accommodated in-space experiments in the Fabrication of Si-As-Te:Ni Ternary Amorphous Semiconductor and the Crystal Growth of Compound Semiconductors. These were two of the many experiments designed and monitored by Japan's National Space Development Agency (NASDA).

  15. Tokamak reactor studies

    SciTech Connect

    Baker, C.C.

    1981-01-01

    This paper presents an overview of tokamak reactor studies with particular attention to commercial reactor concepts developed within the last three years. Emphasis is placed on DT fueled reactors for electricity production. A brief history of tokamak reactor studies is presented. The STARFIRE, NUWMAK, and HFCTR studies are highlighted. Recent developments that have increased the commercial attractiveness of tokamak reactor designs are discussed. These developments include smaller plant sizes, higher first wall loadings, improved maintenance concepts, steady-state operation, non-divertor particle control, and improved reactor safety features.

  16. Evaluation of Ultrasonic Time-of-Flight Diffraction Data for Selected Control Rod Drive Nozzles from Davis Besse Nuclear Power Plant

    SciTech Connect

    Cumblidge, Stephen E.; Cinson, Anthony D.; Anderson, Michael T.

    2011-04-25

    Pacific Northwest National Laboratory (PNNL) examined ultrasonic (UT) time-of-flight diffraction (TOFD) data from ten (10) nozzles in the Davis Besse Nuclear Power Plant reactor closure head. The TOFD data was acquired by AREVA after a bare metal visual examination of the pressure vessel head indicated potential leakage in at least one nozzle. A detailed analysis of the UT data shows that Nozzle 4 has three indications consistent with cracking in the penetration tube. One of the indications starts at the wetted side of the weld and progresses to the annulus. In addition, examination of UT data from the annulus region of Nozzle 4 displays an irregular pattern that could be associated with boric acid deposits and leakage/wastage in the interference fit. The review of TOFD data for the other nine nozzles resulted in several indications being detected in the weld region and near the inner diameter (ID) and outer diameter (OD) surfaces of the penetration tube, but no other indications that are consistent with cracking that may have resulted in leakage were observed. A review of the back-wall reflections in the other nine nozzles also did not show strong indications of leakage, although Nozzle 67 displayed an irregularly-shaped region of high ultrasonic transmission near 180 degrees on the interference fit.

  17. Hybrid plasmachemical reactor

    SciTech Connect

    Lelevkin, V. M. Smirnova, Yu. G.; Tokarev, A. V.

    2015-04-15

    A hybrid plasmachemical reactor on the basis of a dielectric barrier discharge in a transformer is developed. The characteristics of the reactor as functions of the dielectric barrier discharge parameters are determined.

  18. Attrition reactor system

    SciTech Connect

    Scott, Charles D.; Davison, Brian H.

    1993-01-01

    A reactor vessel for reacting a solid particulate with a liquid reactant has a centrifugal pump in circulatory flow communication with the reactor vessel for providing particulate attrition, resulting in additional fresh surface where the reaction can occur.

  19. Attrition reactor system

    SciTech Connect

    Scott, C.D.; Davison, B.H.

    1993-09-28

    A reactor vessel for reacting a solid particulate with a liquid reactant has a centrifugal pump in circulatory flow communication with the reactor vessel for providing particulate attrition, resulting in additional fresh surface where the reaction can occur. 2 figures.

  20. Epidemiology of tennis injuries: An eight-year review of Davis Cup retirements.

    PubMed

    Maquirriain, Javier; Baglione, Roberto

    2016-01-01

    Tennis practice, especially at elite levels, may place players at risk for debilitating musculoskeletal injuries. The aim of this study was to analyse the epidemiological pattern of retirements due to medical conditions sustained by tennis players during Davis Cup matches in the 2006-2013 period. All uncompleted matches due to a medical condition (injuries and illnesses) occurred in the above-mentioned competition were collected from the official source, registered and analysed according to published guidelines. The overall incidence of match retirements was 1.66% (12/719). The injury rate was 6.05/1000 playing hours; and 6.64/1000 match exposures. Musculotendinous lesions were the most common type of injury (66.66%). The incidence of lower-limb injuries was higher than upper-limb and trunk lesions. The incidence of retired matches due to medical conditions was higher in hard courts than in clay courts (2.97% and 0.90%, respectively; p = 0.04), while the median value of inactivity of injuries was 32.0 days (range 3-297). In conclusion, the incidence of retirements due to medical conditions in Davis Cup matches was low supporting the assumption that elite tennis is a low-risk sport activity. Findings provided scientific evidences of injury patterns among male professional tennis players and may contribute to conduct better injury prevention strategies.

  1. Fumio Matsumura--accomplishments at the University of California, Davis, and in the Sierra Nevada Mountains.

    PubMed

    Seiber, James N

    2015-05-01

    Fumio Matsumura joined the University of California, Davis, faculty in 1987 where he served as founding director of the Center for Environmental Health Sciences, associate director of the U.C. Toxic Substances Research and Teaching Program, and chair of the Department of Environmental Toxicology. He was an active affiliate with the NIEHS-funded Superfund Basic Research Program and the NIH Comprehensive Cancer Center. He was in many instances a primary driver or otherwise involved in most activities related to environmental toxicology at Davis, including the education of students in environmental biochemistry and ecotoxicology. A significant part of his broad research program was focused on the long range transport of chemicals such as toxaphene, PCBs and related contaminants used or released in California to the Sierra Nevada mountains, downwind of the urban and agricultural regions of the state. He hypothesized that these chemical residues adversely affected fish and wildlife, and particularly the declining populations of amphibians in Sierra Nevada streams and lakes. Fumio and his students and colleagues found residues of toxaphene and PCBs at higher elevations, an apparent result of atmospheric drift and deposition in the mountains. Fumio and his wife Teruko had personal interests in, and a love of the mountains, as avid skiers, hikers, and outdoor enthusiasts. Copyright © 2014 Elsevier Inc. All rights reserved.

  2. Singing behavior of fin whales in the Davis Strait with implications for mating, migration and foraging.

    PubMed

    Simon, Malene; Stafford, Kathleen M; Beedholm, Kristian; Lee, Craig M; Madsen, Peter T

    2010-11-01

    Most baleen whales undertake migrations between low-latitude breeding grounds and high-latitude feeding grounds. Though little is known about the timing of their migration from the Arctic, fin whales are assumed to undertake a similar migratory pattern. To address questions about habitat use and migrations, the acoustic activity of fin whales in Davis Strait, between Greenland and Canada, was monitored continuously for two years using three bottom-moored acoustic recorders. The acoustic power in the fin whale call frequencies peaked in November-December, showing that fin whales are present in Davis Strait much later in the year than previously expected. The closely timed peaks in song activity and conception time imply that not all fin whales migrate south to mate, but rather start mating at high latitudes rather than or before migrating. Singing activity was strongly linked to daylight hours, suggesting that fin whales might feed during the few daylight hours of the late fall and early Arctic winter. A negative correlation between the advancing sea ice front and power in fin whale frequencies indicates that future changes in sea ice conditions from global warming might change the distribution and migratory patterns of fin whales near the poles.

  3. Indiana v. Davis: revisiting due process rights of permanently incompetent defendants.

    PubMed

    Morris, Douglas R; Parker, George F

    2009-01-01

    With its landmark Jackson v. Indiana (406 U.S. 715 (1972)) decision, the United States Supreme Court ruled that states may not indefinitely confine criminal defendants solely on the basis of incompetence to stand trial. While this decision led to widespread state statutory and procedural changes, the Jackson court left unresolved whether states could indefinitely maintain criminal charges against incompetent defendants. Nearly four decades after the Jackson decision, the Indiana Supreme Court finally revisited this question in Indiana v. Davis (898 N.E.2d. 281 (Ind. 2008)), unanimously ruling that holding criminal charges over the head of a permanently incompetent defendant, when her pretrial confinement extended beyond the maximum period of any sentence the trial court could impose, violated the basic notions of fundamental fairness embodied in the Due Process Clause of the Fourteenth Amendment. In this analysis of Indiana v. Davis, the facts of the case and the court's rationale for its decision are discussed. This unique ruling is considered in light of the questions resolved and still unanswered since Jackson v. Indiana.

  4. "Our sickness record is a national disgrace": Adelle Davis, nutritional determinism, and the anxious 1970s.

    PubMed

    Carstairs, Catherine

    2014-07-01

    America's most widely read nutritionist of the postwar decades, Adelle Davis, helped to shape Americans' eating habits, their child-feeding practices, their views about the quality of their food supply, and their beliefs about the impact of nutrition on their emotional and physical health. This paper closely examines Davis's writings and argues that even though she is often associated with countercultural food reformers like Alice Waters and Frances Moore Lappé, she had as much in common with the writings of interwar nutritionists and home economists. While she was alarmed about the impact of pesticides and food additives on the quality of the food supply, and concerned about the declining fertility of American soil, she commanded American women to feed their families better and promised that improved nutrition would produce stronger, healthier, more beautiful children who would ensure America's future strength. She believed that nearly every health problem could be solved through nutrition, and urged her readers to manage their diets carefully and to take extensive supplementation to ensure optimum health. As such, she played an important role in creating the ideology of "nutritionism" - the idea that food should be valued more for its constituent parts than for its pleasures or cultural significance. © The Author 2012. Published by Oxford University Press. All rights reserved. For permissions, please e-mail: journals.permissions@oup.com.

  5. Period meter for reactors

    DOEpatents

    Rusch, Gordon K.

    1976-01-06

    An improved log N amplifier type nuclear reactor period meter with reduced probability for noise-induced scrams is provided. With the reactor at low power levels a sampling circuit is provided to determine the reactor period by measuring the finite change in the amplitude of the log N amplifier output signal for a predetermined time period, while at high power levels, differentiation of the log N amplifier output signal provides an additional measure of the reactor period.

  6. NEUTRONIC REACTOR POWER PLANT

    DOEpatents

    Metcalf, H.E.

    1962-12-25

    This patent relates to a nuclear reactor power plant incorporating an air-cooled, beryllium oxide-moderated, pebble bed reactor. According to the invention means are provided for circulating a flow of air through tubes in the reactor to a turbine and for directing a sidestream of the circu1ating air through the pebble bed to remove fission products therefrom as well as assist in cooling the reactor. (AEC)

  7. Health assessment for Broward County Landfill (Aka Davie Landfill), Davie, Broward County, Florida, Region 4. CERCLIS No. FLD980602288. Preliminary report

    SciTech Connect

    Not Available

    1989-04-10

    The Broward Count Landfill (aka Davie Landfill, South Broward Landfill, and Broward County Solid Waste Disposal Facility), which began operations in 1964, is located 10 miles southwest of Fort Lauderdale, Florida. The site consists of a 48-acre solid waste landfill, a 68-acre sanitary landfill and a 4-acre sludge lagoon. The solid waste landfill was used to dispose of the municipal solid waste being incinerated at the on-site incinerator. Ammonia, chlorides, sulfate, nitrates, and iron were found in the surface water (borrow pits) on-site. Sludge from the lagoon was found to contain cyanide. Soils on-site have been contaminated with a variety of compounds related to previous landfill activities. The groundwater on-site and downgradient of the site shows elevated levels of sulfate, chloride, lead, and ammonia. Benzene, vinyl chloride, and some unidentified compounds have been detected in monitoring wells and private wells to the south of the landfill. The site is considered to be of potential public health concern because of the risk to human health caused by the possibility of exposure to hazardous substances via on-site ingestion, inhalation, and dermal contact exposures to contaminants present in soil, groundwater, surface water, sediments, and air and off-site ingestion, inhalation, and direct contact exposures to contaminants present in groundwater.

  8. NUCLEAR REACTOR CONTROL SYSTEM

    DOEpatents

    Epler, E.P.; Hanauer, S.H.; Oakes, L.C.

    1959-11-01

    A control system is described for a nuclear reactor using enriched uranium fuel of the type of the swimming pool and other heterogeneous nuclear reactors. Circuits are included for automatically removing and inserting the control rods during the course of normal operation. Appropriate safety circuits close down the nuclear reactor in the event of emergency.

  9. Improved vortex reactor system

    DOEpatents

    Diebold, James P.; Scahill, John W.

    1995-01-01

    An improved vortex reactor system for affecting fast pyrolysis of biomass and Refuse Derived Fuel (RDF) feed materials comprising: a vortex reactor having its axis vertically disposed in relation to a jet of a horizontally disposed steam ejector that impels feed materials from a feeder and solids from a recycle loop along with a motive gas into a top part of said reactor.

  10. Advanced Test Reactor Tour

    SciTech Connect

    Miley, Don

    2011-01-01

    The Advanced Test Reactor at Idaho National Laboratory is the foremost nuclear materials test reactor in the world. This virtual tour describes the reactor, how experiments are conducted, and how spent nuclear fuel is handled and stored. For more information about INL research, visit http://www.facebook.com/idahonationallaboratory.

  11. Advanced Test Reactor Tour

    ScienceCinema

    Miley, Don

    2016-07-12

    The Advanced Test Reactor at Idaho National Laboratory is the foremost nuclear materials test reactor in the world. This virtual tour describes the reactor, how experiments are conducted, and how spent nuclear fuel is handled and stored. For more information about INL research, visit http://www.facebook.com/idahonationallaboratory.

  12. NEUTRONIC REACTOR SHIELDING

    DOEpatents

    Borst, L.B.

    1961-07-11

    A special hydrogenous concrete shielding for reactors is described. In addition to Portland cement and water, the concrete essentially comprises 30 to 60% by weight barytes aggregate for enhanced attenuation of fast neutrons. The biological shields of AEC's Oak Ridge Graphite Reactor and Materials Testing Reactor are particular embodiments.

  13. High solids fermentation reactor

    DOEpatents

    Wyman, Charles E.; Grohmann, Karel; Himmel, Michael E.; Richard, Christopher J.

    1993-01-01

    A fermentation reactor and method for fermentation of materials having greater than about 10% solids. The reactor includes a rotatable shaft along the central axis, the shaft including rods extending outwardly to mix the materials. The reactor and method are useful for anaerobic digestion of municipal solid wastes to produce methane, for production of commodity chemicals from organic materials, and for microbial fermentation processes.

  14. High solids fermentation reactor

    DOEpatents

    Wyman, Charles E.; Grohmann, Karel; Himmel, Michael E.; Richard, Christopher J.

    1993-03-02

    A fermentation reactor and method for fermentation of materials having greater than about 10% solids. The reactor includes a rotatable shaft along the central axis, the shaft including rods extending outwardly to mix the materials. The reactor and method are useful for anaerobic digestion of municipal solid wastes to produce methane, for production of commodity chemicals from organic materials, and for microbial fermentation processes.

  15. Efficient Silicon Reactor

    NASA Technical Reports Server (NTRS)

    Bates, H. E.; Hill, D. M.; Jewett, D. N.

    1983-01-01

    High-purity silicon efficiently produced and transferred by continuous two-cycle reactor. New reactor operates in relatively-narrow temperature rate and uses large surfaces area to minimize heat expenditure and processing time in producing silicon by hydrogen reduction of trichlorosilane. Two cycles of reactor consists of silicon production and removal.

  16. 40Ar/39Ar chronology and volcanology of silicic volcanism in the Davis Mountains, Trans-Pecos Texas

    USGS Publications Warehouse

    Henry, Christopher D.; Kunk, M.J.; McIntosh, W.C.

    1994-01-01

    Field studies and 40Ar/39Ar dating reveal that silicic volcanism in the Davis Mountains part of the Trans-Pecos Texas volcanic field occurred in six episodes at 0.3 m.y. intervals between 36.8 and 35.3 Ma. Additionally, two groups of silicic intrusions were emplaced at 34.6 and 32.8 Ma. This episodicity is similar to that determined for volcanic fields dominated by ash-flow tuffs, yet voluminous, extensive silicic lavas are considerably more abundant than tuffs in the Davis Mountains, by number of flows and by volume. The preponderance of voluminous silicic lavas over tuffs most likely reflects low water contents and high temperatures of the alkalic and commonly peralkaline Davis Mountains magmas.The earliest episode, at 36.8 Ma, included a widespread and voluminous (possibly >1,000 km3) suite of rhyolite and quartz trachyte lavas, several rhyolite domes, and a strongly rheomorphic, peralkaline ash-flow tuff erupted from a caldera in the northern Davis Mountains. The lava suite extends well beyond the Davis Mountains. Silicic lavas of all episodes probably erupted from widespread, fissure vents. The 36.5 Ma episode consisted of rhyolite to quartz trachyte lavas, also extensive and voluminous (∼200 km3). The 36.3 Ma episode consisted of rhyolite to trachyte tuffs and lavas erupted from a central vent volcano in the southern Davis Mountains. The 35.9 Ma episode consisted of a single, moderately large (∼50 km3) rhyolite lava and a small-volume ash-flow tuff erupted from a caldera in the western Davis Mountains. Rocks emplaced during the 35.6 Ma episode were also rhyolites, including an enigmatic rock that may be strongly rheomorphic ash-flow tuff or a combination of tuff and lava, followed by definite lavas. The 35.3 Ma episode consisted of two ash-flow tuffs, one of which is strongly rheomorphic, and additional voluminous rhyolite lavas (∼120 km3). The rheomorphic tuff erupted from a caldera in the southwestern Davis Mountains. The source of the other tuff is

  17. Reactor vessel support system

    DOEpatents

    Golden, Martin P.; Holley, John C.

    1982-01-01

    A reactor vessel support system includes a support ring at the reactor top supported through a box ring on a ledge of the reactor containment. The box ring includes an annular space in the center of its cross-section to reduce heat flow and is keyed to the support ledge to transmit seismic forces from the reactor vessel to the containment structure. A coolant channel is provided at the outside circumference of the support ring to supply coolant gas through the keyways to channels between the reactor vessel and support ledge into the containment space.

  18. Nuclear reactor overflow line

    DOEpatents

    Severson, Wayne J.

    1976-01-01

    The overflow line for the reactor vessel of a liquid-metal-cooled nuclear reactor includes means for establishing and maintaining a continuous bleed flow of coolant amounting to 5 to 10% of the total coolant flow through the overflow line to prevent thermal shock to the overflow line when the reactor is restarted following a trip. Preferably a tube is disposed concentrically just inside the overflow line extending from a point just inside the reactor vessel to an overflow tank and a suction line is provided opening into the body of liquid metal in the reactor vessel and into the annulus between the overflow line and the inner tube.

  19. Thorium fueled reactor

    NASA Astrophysics Data System (ADS)

    Sipaun, S.

    2017-01-01

    Current development in thorium fueled reactors shows that they can be designed to operate in the fast or thermal spectrum. The thorium/uranium fuel cycle converts fertile thorium-232 into fissile uranium-233, which fissions and releases energy. This paper analyses the characteristics of thorium fueled reactors and discusses the thermal reactor option. It is found that thorium fuel can be utilized in molten salt reactors through many configurations and designs. A balanced assessment on the feasibility of adopting one reactor technology versus another could lead to optimized benefits of having thorium resource.

  20. High temperature reactors

    NASA Astrophysics Data System (ADS)

    Dulera, I. V.; Sinha, R. K.

    2008-12-01

    With the advent of high temperature reactors, nuclear energy, in addition to producing electricity, has shown enormous potential for the production of alternate transport energy carrier such as hydrogen. High efficiency hydrogen production processes need process heat at temperatures around 1173-1223 K. Bhabha Atomic Research Centre (BARC), is currently developing concepts of high temperature reactors capable of supplying process heat around 1273 K. These reactors would provide energy to facilitate combined production of hydrogen, electricity, and drinking water. Compact high temperature reactor is being developed as a technology demonstrator for associated technologies. Design has been also initiated for a 600 MWth innovative high temperature reactor. High temperature reactor development programme has opened new avenues for research in areas like advanced nuclear fuels, high temperature and corrosion resistant materials and protective coatings, heavy liquid metal coolant technologies, etc. The paper highlights design of these reactors and their material related requirements.

  1. Spinning fluids reactor

    DOEpatents

    Miller, Jan D; Hupka, Jan; Aranowski, Robert

    2012-11-20

    A spinning fluids reactor, includes a reactor body (24) having a circular cross-section and a fluid contactor screen (26) within the reactor body (24). The fluid contactor screen (26) having a plurality of apertures and a circular cross-section concentric with the reactor body (24) for a length thus forming an inner volume (28) bound by the fluid contactor screen (26) and an outer volume (30) bound by the reactor body (24) and the fluid contactor screen (26). A primary inlet (20) can be operatively connected to the reactor body (24) and can be configured to produce flow-through first spinning flow of a first fluid within the inner volume (28). A secondary inlet (22) can similarly be operatively connected to the reactor body (24) and can be configured to produce a second flow of a second fluid within the outer volume (30) which is optionally spinning.

  2. Reactor water cleanup system

    DOEpatents

    Gluntz, Douglas M.; Taft, William E.

    1994-01-01

    A reactor water cleanup system includes a reactor pressure vessel containing a reactor core submerged in reactor water. First and second parallel cleanup trains are provided for extracting portions of the reactor water from the pressure vessel, cleaning the extracted water, and returning the cleaned water to the pressure vessel. Each of the cleanup trains includes a heat exchanger for cooling the reactor water, and a cleaner for cleaning the cooled reactor water. A return line is disposed between the cleaner and the pressure vessel for channeling the cleaned water thereto in a first mode of operation. A portion of the cooled water is bypassed around the cleaner during a second mode of operation and returned through the pressure vessel for shutdown cooling.

  3. Reactor water cleanup system

    DOEpatents

    Gluntz, D.M.; Taft, W.E.

    1994-12-20

    A reactor water cleanup system includes a reactor pressure vessel containing a reactor core submerged in reactor water. First and second parallel cleanup trains are provided for extracting portions of the reactor water from the pressure vessel, cleaning the extracted water, and returning the cleaned water to the pressure vessel. Each of the cleanup trains includes a heat exchanger for cooling the reactor water, and a cleaner for cleaning the cooled reactor water. A return line is disposed between the cleaner and the pressure vessel for channeling the cleaned water thereto in a first mode of operation. A portion of the cooled water is bypassed around the cleaner during a second mode of operation and returned through the pressure vessel for shutdown cooling. 1 figure.

  4. Tectonic Structure, Solid Earth and Cryosphere Interactions in the Casey-Davis Region of East Antarctica

    NASA Astrophysics Data System (ADS)

    Reading, A. M.; King, M. A.; Halpin, J.; Whittaker, J. M.; White, D.; Cook, S.; Staal, T.

    2016-12-01

    The region of inland East Antarctica between Casey and Davis stations (Wilkes Land to Princess Elizabeth Land) is one of the least investigated parts of the continent with respect to its tectonic and solid Earth structure. This is difficult to estimate because the conjugate margin in plate reconstructions has been lost in the collision between India and Eurasia. The region is also host to some of the greatest uncertainties in Antarctica in glacial-isostatic adjustment observations and models, and where the contribution of heat from underlying rocks is difficult to estimate due to the limited available rock samples. We investigate the solid Earth structure and its interactions with the East Antarctic ice sheet through a new campaign including GPS and seismic instrument deployments, and field measurements to constrain ice retreat history. This presentation provides an overview of the new, multi-year Casey-Davis Glacial Isostatic Adjustment campaign including station locations and deployment progress. The campaign is being supported by Australian Antarctic Division and uses a combination of fixed-wing and helicopter support to access station locations in both coastal locations and the continental interior. A primary long-term objective of the campaign is to remove bias from estimates of East Antarctica's contribution to past and present sea level changes. We also seek to better constrain the geothermal influences on the East Antarctic ice sheet. The GPS determinations of vertical plate motion and the detailed seismic structure await data downloads in future field seasons, however, we are able to present new findings from preliminary studies. We show candidate ancient tectonic reconstructions for this part of East Antarctica and make use of our knowledge of structure of continental regions with a similar evolution to infer the likely structures for the Casey-Davis region. We add these new constraints to the structure currently inferred from a very small number of

  5. DaVIE: Database for the Visualization and Integration of Epigenetic data

    PubMed Central

    Fejes, Anthony P.; Jones, Meaghan J.; Kobor, Michael S.

    2014-01-01

    One of the challenges in the analysis of large data sets, particularly in a population-based setting, is the ability to perform comparisons across projects. This has to be done in such a way that the integrity of each individual project is maintained, while ensuring that the data are comparable across projects. These issues are beginning to be observed in human DNA methylation studies, as the Illumina 450k platform and next generation sequencing-based assays grow in popularity and decrease in price. This increase in productivity is enabling new insights into epigenetics, but also requires the development of pipelines and software capable of handling the large volumes of data. The specific problems inherent in creating a platform for the storage, comparison, integration, and visualization of DNA methylation data include data storage, algorithm efficiency and ability to interpret the results to derive biological meaning from them. Databases provide a ready-made solution to these issues, but as yet no tools exist that that leverage these advantages while providing an intuitive user interface for interpreting results in a genomic context. We have addressed this void by integrating a database to store DNA methylation data with a web interface to query and visualize the database and a set of libraries for more complex analysis. The resulting platform is called DaVIE: Database for the Visualization and Integration of Epigenetics data. DaVIE can use data culled from a variety of sources, and the web interface includes the ability to group samples by sub-type, compare multiple projects and visualize genomic features in relation to sites of interest. We have used DaVIE to identify patterns of DNA methylation in specific projects and across different projects, identify outlier samples, and cross-check differentially methylated CpG sites identified in specific projects across large numbers of samples. A demonstration server has been setup using GEO data at http

  6. First results of combined Fe-lidar/Radar measurements at Davis, 69° S.

    NASA Astrophysics Data System (ADS)

    Höffner, J.; Morris, R. J.; Kaifler, B.; Viehl, T.; Lübken, F.-J.

    2012-04-01

    The mobile scanning Fe-lidar of the IAP-Kühlungsborn was moved to Davis, Antarctica, 69° S, 78° E during November 2010. This location was chosen because PMSE/NLC observations by MST-radar/RMR-lidar have been performed since 2003/2001 by the Australian Antarctic Division. Davis is the only station in Antarctica where comparable long-term observations to Alomar, 69° N are available. A comparison of both locations allows a detailed comparison of differences or similarities between the northern (NH) / southern hemisphere (SH) at mesopause altitudes. The Fe-lidar is a two wavelength system which measures Doppler temperature/vertical wind and iron densities by resonance scattering at 386 nm. The fundamental wavelength at 772 nm is used for aerosol measurements from the stratosphere to the mesosphere including NLC in summer or PSC in winter. Measurements are almost background free which allows year round operation independent of sunlight. At Davis the lidar was in operation 24% of the first year (2150 hours) which has not been achieved elsewhere with a mesospheric lidar. This unusual and already largest lidar data base of Antarctica shows the thermal structure of the mesopause region and the iron layer in great detail. Strong tides throughout the year have been observed and a link of the early part of the PMSE season to the stratospheric vortex has been found. More than 700 hours of temperature observation during the PMSE-season are compared with common volume PMSE/NLC observations. For the first time temperature and vertical wind measurements through PMSE and NLC have been achieved by a lidar showing that the SH in particular in December/January differs significantly from the NH in June/July. The temperature measurements near 86 km altitude show that the summer mesopause is surprisingly similar to the NH at PMSE altitudes but differs significantly at higher altitudes. Unlike the NH the southern mesopause altitude changes throughout the season by several kilometres

  7. Hydrology of Crater, East and Davis Lakes, Oregon; with section on Chemistry of the Lakes

    USGS Publications Warehouse

    Phillips, Kenneth N.; Van Denburgh, A.S.

    1968-01-01

    Crater, East, and Davis Lakes are small bodies of fresh water that occupy topographically closed basins in Holocene volcanic terrane. Because the annual water supply exceeds annual evaporation, water must be lost by seepage from each lake. The seepage rates vary widely both in volume and in percentage of the total water supply. Crater Lake loses about 89 cfs (cubic feet per second), equivalent to about 72 percent of its average annual supply. East Lake loses about 2.3 cfs, or about 44 percent of its estimated supply. Davis Lake seepage varies greatly with lake level, but the average loss is about 150 cfs, more than 90 percent of its total supply. The destination of the seepage loss is not definitely known for any of the lakes. An approximate water budget was computed for stationary level for each lake, by using estimates 'by the writer to supplement the hydrologic data available. The three lake waters are dilute. Crater Lake contains about 80 ppm, (parts per million) of dissolved solids---mostly silica, sodium, and bicarbonate, and lesser amounts of calcium, sulfate, and chloride. Much of the dissolved-solids content of Crater Lake---especially the sulfate and chloride---may be related to fumarole and thermal-spring activity that presumably followed the collapse of Mount Mazama. Although Grater Lake loses an estimated 7,000 tons of its 1.5million-ton salt content each year by leakage, the chemical character of the lake did not change appreciably between 1912 and 1964. East Lake contains 200 ppm of dissolved solids, which includes major proportions of calcium, sodium, bicarbonate, and sulfate, but almost no chloride. The lake apparently receives much of its dissolved solids from subsurface thermal springs. Annual solute loss from East Lake by leakage is about 450 tons, or 3 percent of the lake's 15,000-ton estimated solute content. Davis Lake contains only 48 ppm of dissolved solids, much of which is silica and bicarbonate; chloride is almost completely absent

  8. Advanced gas cooling study for the hospital at Davis-Monthan AFB, AZ. Final report

    SciTech Connect

    Caponegro, M.A.; Brown, W.T.; Pedersen, T.W.

    1999-01-01

    Based on its experience with a cogeneration project at Tyndall AFB, the Air Force Civil Engineering Support Agency (AFCESA) tasked the US Army Construction Engineering Research Laboratories (USACERL) to perform an analysis to see if such a concept, or some other cooling options, could be of economic benefit at the Air Force medical facility at Davis-Monthan AFB, AZ, where the cost of purchased electrical power is relatively high compared to that of natural gas. USACERL researchers developed a cooling load profile for the facility by reviewing plant records and interviewing plant operators. Boiler logs (daily and monthly) were consulted to determine heating loads, and a spreadsheet was developed to analyze nine options. Savings and first costs were input into the Life Cycle Cost in Design (LCCID) computer program to determine simple paybacks and savings-to-investment ratios for all options. Based on the results of the investigation, preferred options were recommended for meeting the facility cooling load.

  9. Personal health practices of urban adults in Alabama: Davis Avenue Community Study.

    PubMed Central

    Morris, J; Windsor, R A

    1985-01-01

    The need to establish baseline data on and monitor the personal health practices and beliefs of adults in a community served by health care facilities is well documented. The purpose of the survey was to determine health care practices, personal health behaviors, and health services use of the adults living in the Davis Avenue Community (DAC), a six-census tract area located in Mobile, AL. The DAC's population is approximately 95 percent black. Using methods developed by the National Center for Health Statistics, 402 adults between the ages of 20 and 69 years were interviewed by telephone by trained personnel to ascertain the health-related characteristics of residents in this health services area. Information collected in this survey provided the staff of the Franklin Memorial Primary Health Center, who provide primary health care in the area, with an empirical base on which to plan and market health promotion and education programs for the health services area. PMID:3931168

  10. STS-47 MS Davis and Pilot Brown repair ISAIAH humidity problem aboard OV-105

    NASA Technical Reports Server (NTRS)

    1992-01-01

    STS-47 Pilot Curtis L. Brown, Jr (foreground) and Mission Specialist (MS) N. Jan Davis (left) team up to cure a high humidity problem in the Israel Space Agency Investigation About Hornets (ISAIAH) experiment on the middeck of Endeavour, Orbiter Vehicle (OV) 105. Via a jury-rigged hose hook-up, the two were able to blow air from a launch and entry suit (LES) fan into the experiment, thus eliminating condesation that obscured the viewing of ISAIAH. ISAIAH, an enclosure located in locker MF43H, contains 180 female Oriental Hornets and will examine the effects of microgravity on the orientation, reproductive capability and social activity of the hornets. Also, the direction of comb-building by hornet workers in microgravity, as well as the structural integrity of the combs, will be examined.

  11. HYSCORE and Davies ENDOR study of irradiated ultra high molecular weight polyethylene.

    PubMed

    Paganini, Maria Cristina; Brunella, Valentina; Chiesa, Mario

    2012-09-01

    Ultra high molecular weight polyethylene (UHMWPE) has been studied with different magnetic resonance techniques to elicit information on the nature and the location of radicals generated during high energy irradiation. Field swept electron paramagnetic resonance, pulsed Davies electron nuclear double resonance and hyperfine sublevel correlation spectroscopic measurements allowed extracting for the first time the full (1) H hyperfine coupling tensors of the most abundant radical, i.e. a secondary alkyl radical and to ascertain the formation of allyl radicals in the first stages of the irradiation process. The (1) H hyperfine coupling tensors are analogous to those reported for single crystal irradiated polyethylene, suggesting that radicals generated in UHMWPE are located in the crystalline region of the polymer.

  12. Late-time structure of the Bunch-Davies FRW wavefunction

    NASA Astrophysics Data System (ADS)

    Konstantinidis, George; Mahajan, Raghu; Shaghoulian, Edgar

    2016-10-01

    In this short note we organize a perturbation theory for the Bunch-Davies wavefunction in flat, accelerating cosmologies. The calculational technique avoids the in-in formalism and instead uses an analytic continuation from Euclidean signature. We will consider both massless and conformally coupled self-interacting scalars. These calculations explicitly illustrate two facts. The first is that IR divergences get sharper as the acceleration slows. The second is that UV-divergent contact terms in the Euclidean computation can contribute to the absolute value of the wavefunction in Lorentzian signature. Here UV divergent refers to terms involving inverse powers of the radial cutoff in the Euclidean computation. In Lorentzian signature such terms encode physical time dependence of the wavefunction.

  13. The Fe-layer in the MLT region at Davis, Antarctica

    NASA Astrophysics Data System (ADS)

    Viehl, Timo; Luebken, Franz-Josef; Morris, Ray; Höffner, Josef; Kaifler, Bernd

    The mobile Fe-Lidar of the Leibniz-Institute of Atmospheric Physics (IAP) was operated at Davis, Antarctica (69°S) from December 15th, 2010 to December 31st, 2012 in a joint project with the Australian Antarctic Division. Here we present recent results of the analyses of more than 2900 hours of temperature, Fe metal density and NLC/PMSE measurements in the MLT region with an emphasis on new insights about the Fe-layer’s summer time behaviour. We show that the seasonal change of the Fe-layer is not dominated by ice particles, but by temperature and dynamics. Furthermore we present measurements of temperatures in PMSE and NLC.

  14. The Failure of Scientific Medicine: Davis Inlet as an Example of Sociopolitical Morbidity

    PubMed Central

    Scott, Richard T.; Conn, Selina

    1987-01-01

    The social and economic history of a Labrador coastal town is reviewed with particular reference to the roles of the Church, the Hudson's Bay Company, and the medical profession. Objective indicators of the current health status of the community are presented, and the major causes of ill-health in Davis Inlet are discussed. Comparison is made with Rudolph Virchow's assessment of the causes of a typhoid epidemic in Upper Silesia in 1848. The subsequent evolution of medicine from a socio-political to a scientific model is reviewed briefly. The authors conclude that the medical profession has embraced the scientific model to the point of virtually excluding the socio-political one, even though social, political, economic, and cultural alienation remain major causes of morbidity and mortality. In so doing, the profession promotes ill-health. PMID:21263779

  15. Julian Davies and the discovery of kanamycin resistance transposon Tn5.

    PubMed

    Berg, Douglas E

    2016-10-12

    This paper recounts some of my fond memories of a collaboration between Julian Davies and myself that started in 1974 in Geneva and that led to our serendipitous discovery of the bacterial kanamycin resistance transposon Tn5, and aspects of the lasting positive impact of our interaction and discovery on me and the community. Tn5 was one of the first antibiotic resistance transposons to be found. Its analysis over the ensuing decades provided valuable insights into mechanisms and control of transposition, and led to its use as a much-valued tool in diverse areas of molecular genetics, as also will be discussed here.The Journal of Antibiotics advance online publication, 12 October 2016; doi:10.1038/ja.2016.120.

  16. Ground-water quality in the Davie Landfill, Broward County, Florida

    USGS Publications Warehouse

    Mattraw, H.C.

    1976-01-01

    Ground-water adjacent to a disposal pond for septic tank sludge, oil, and grease at the Davie landfill, Broward County, Florida was tested for a variety of ground-water contaminants. Three wells adjacent to the disposal pond yielded water rich in nutrients, organic carbon and many other chemical constituents. Total coliform bacteria ranged from less than 100 to 660 colonies per 100 milliliters in samples collected from the shallowest well (depth 20 feet). At well depths of 35 and 45 feet bacterial counts were less than 20 colonies per 100 milliliters or zero. Concentrations of several constituents in water samples collected from the wells downgradient from the landfill, disposal pond, and an incinerator wash pond were greater than in samples collected from wells immediately upgradient of the landfill. A comparison of sodium-chloride ion ratios indicated that downgradient ground-water contamination was related to the incinerator wash water pond rather than the septic tank sludge pond. (Woodard-USGS)

  17. Review of a Proposal for Los Rios Community College District to Establish an Educational Center in Davis. Commission Report 08-24

    ERIC Educational Resources Information Center

    California Postsecondary Education Commission, 2008

    2008-01-01

    The Los Rios Community College District has proposed to convert its Davis outreach operations to a single, state-approved educational center. The proposal responds to the district's need to expand educational services in the Davis area. The area is marked by high student demand and limited instructional facilities. In the 2006-07 academic year,…

  18. The relationship between conductivity and major ions within the Davis Spring drainage basin as a method to determine the source of spring discharge

    USDA-ARS?s Scientific Manuscript database

    The Davis Spring drainage basin is a 190 km2 karst basin in Greenbrier County, West Virginia underlain by the 300+ m sequence of the Mississippian Greenbrier Limestone Group which rests on top of the Maccrady Shale. Davis Spring is the largest karst spring in West Virginia with average flows of 10 ...

  19. Graduate and Professional School Applications, Admissions and Enrollments (1981-1988): A Status Report on Ethnic Groups Underrepresented at UC Davis. Research Synopsis No. 29.

    ERIC Educational Resources Information Center

    California Univ., Davis. Office of Student Affairs Research and Information.

    This report describes postgraduate enrollment trends for ethnic groups underrepresented at University of California, Davis. The UC Davis Student Affirmative Action (SAA) Plan identifies the following groups as underrepresented in both the Graduate Division and professional schools: American Indian, Black/African-American, Chicano/Mexican American,…

  20. 48 CFR 53.301-1093 - Standard Form 1093, Schedule of Withholdings Under the Davis-Bacon Act and/or the Contract Work...

    Code of Federal Regulations, 2012 CFR

    2012-10-01

    ... 48 Federal Acquisition Regulations System 2 2012-10-01 2012-10-01 false Standard Form 1093, Schedule of Withholdings Under the Davis-Bacon Act and/or the Contract Work Hours and Safety Standards Act... Withholdings Under the Davis-Bacon Act and/or the Contract Work Hours and Safety Standards Act. EC01MY91.076...

  1. 48 CFR 53.301-1093 - Standard Form 1093, Schedule of Withholdings Under the Davis-Bacon Act and/or the Contract Work...

    Code of Federal Regulations, 2011 CFR

    2011-10-01

    ... 48 Federal Acquisition Regulations System 2 2011-10-01 2011-10-01 false Standard Form 1093, Schedule of Withholdings Under the Davis-Bacon Act and/or the Contract Work Hours and Safety Standards Act... Withholdings Under the Davis-Bacon Act and/or the Contract Work Hours and Safety Standards Act. EC01MY91.076...

  2. 48 CFR 53.301-1093 - Standard Form 1093, Schedule of Withholdings Under the Davis-Bacon Act and/or the Contract Work...

    Code of Federal Regulations, 2013 CFR

    2013-10-01

    ... 48 Federal Acquisition Regulations System 2 2013-10-01 2013-10-01 false Standard Form 1093, Schedule of Withholdings Under the Davis-Bacon Act and/or the Contract Work Hours and Safety Standards Act... Withholdings Under the Davis-Bacon Act and/or the Contract Work Hours and Safety Standards Act. EC01MY91.076...

  3. 42 CFR 137.378 - Do the Federal Davis-Bacon Act and wage rates apply to construction projects performed by Self...

    Code of Federal Regulations, 2012 CFR

    2012-10-01

    ... 42 Public Health 1 2012-10-01 2012-10-01 false Do the Federal Davis-Bacon Act and wage rates apply... Other § 137.378 Do the Federal Davis-Bacon Act and wage rates apply to construction projects performed...-Bacon Act and wage rates do not apply to construction projects performed by Self-Governance Tribes...

  4. 42 CFR 137.378 - Do the Federal Davis-Bacon Act and wage rates apply to construction projects performed by Self...

    Code of Federal Regulations, 2011 CFR

    2011-10-01

    ... 42 Public Health 1 2011-10-01 2011-10-01 false Do the Federal Davis-Bacon Act and wage rates apply... Other § 137.378 Do the Federal Davis-Bacon Act and wage rates apply to construction projects performed...-Bacon Act and wage rates do not apply to construction projects performed by Self-Governance Tribes...

  5. 42 CFR 137.378 - Do the Federal Davis-Bacon Act and wage rates apply to construction projects performed by Self...

    Code of Federal Regulations, 2014 CFR

    2014-10-01

    ... 42 Public Health 1 2014-10-01 2014-10-01 false Do the Federal Davis-Bacon Act and wage rates apply... Other § 137.378 Do the Federal Davis-Bacon Act and wage rates apply to construction projects performed...-Bacon Act and wage rates do not apply to construction projects performed by Self-Governance Tribes...

  6. 48 CFR 53.301-1093 - Standard Form 1093, Schedule of Withholdings Under the Davis-Bacon Act and/or the Contract Work...

    Code of Federal Regulations, 2010 CFR

    2010-10-01

    ... 48 Federal Acquisition Regulations System 2 2010-10-01 2010-10-01 false Standard Form 1093, Schedule of Withholdings Under the Davis-Bacon Act and/or the Contract Work Hours and Safety Standards Act... Withholdings Under the Davis-Bacon Act and/or the Contract Work Hours and Safety Standards Act. EC01MY91.076...

  7. 42 CFR 137.378 - Do the Federal Davis-Bacon Act and wage rates apply to construction projects performed by Self...

    Code of Federal Regulations, 2013 CFR

    2013-10-01

    ... 42 Public Health 1 2013-10-01 2013-10-01 false Do the Federal Davis-Bacon Act and wage rates apply... Other § 137.378 Do the Federal Davis-Bacon Act and wage rates apply to construction projects performed...-Bacon Act and wage rates do not apply to construction projects performed by Self-Governance Tribes...

  8. Neutron fluxes in test reactors

    SciTech Connect

    Youinou, Gilles Jean-Michel

    2017-01-01

    Communicate the fact that high-power water-cooled test reactors such as the Advanced Test Reactor (ATR), the High Flux Isotope Reactor (HFIR) or the Jules Horowitz Reactor (JHR) cannot provide fast flux levels as high as sodium-cooled fast test reactors. The memo first presents some basics physics considerations about neutron fluxes in test reactors and then uses ATR, HFIR and JHR as an illustration of the performance of modern high-power water-cooled test reactors.

  9. Comment on Lockwood and Davis, "On the longitudinal extent of magnetopause reconnection pulses"

    NASA Astrophysics Data System (ADS)

    Heikkila, W. J.

    1999-02-01

    Lockwood and Davis (1996) present a concise description of magnetopause reconnection pulses, with the claimed support of three types of observations: (1) flux transfer events (FTE), (2) poleward-moving auroral forms on the dayside, and (3) steps in cusp ion dispersion characteristics. However, there are a number of errors and misconceptions in the paper that make their conclusions untenable. They do not properly take account of the fact that the relevant processes operate in the presence of a plasma. They fail to notice that the source of energy (a dynamo with E · J<0) must be close to the region of dissipation (the electrical load with E · J>0) in transient phenomena, since energy (or information) cannot travel faster than the group velocity of waves in the medium (here the Alfvén velocity VA). In short, Lockwood and Davis use the wrong contour in their attempt to evaluate the electromotive force (emf). This criticism goes beyond their article: a dynamo is not included in the usual definition of reconnection, only the reconnection load. Without an explicit source of energy in the assumed model, the idea of magnetic reconnection is improperly posed. Recent research has carried out a superposed epoch analysis of conditions near the dayside magnetopause and has found the dynamo and the load, both within the magnetopause current sheet. Since the magnetopause current is from dawn to dusk, the sign of E · J reflects the sign of the electric field. The electric field reverses, within the magnetopause; this can be discovered by an application of Lenz's law using the concept of erosion of the magnetopause. The net result is plasma transfer across the magnetopause to feed the low latitude boundary layer, at least partly on closed field lines, and viscous interaction as the mechanism by which solar wind plasma couples to the magnetosphere.

  10. Sir Humphry Davy and the coal miners of the world: a commentary on Davy (1816) 'An account of an invention for giving light in explosive mixtures of fire-damp in coal mines'.

    PubMed

    Thomas, John Meurig

    2015-04-13

    In the period between 1815 and 1818, Sir Humphry Davy read four papers to the Royal Society and published a monograph dealing with a safety lamp for coal miners, all of which record in detail the experimental work that he carried out, with his assistant Michael Faraday, so as to determine how to prevent catastrophic accidents in coal mines by the explosion of fire-damp (methane) in the presence of a naked flame. This article describes the key experiments that he performed at the Royal Institution and some of the subsequent trials made in the coal mines of the north of England. It begins, however, with an account of Davy's prior achievements in science before he was approached for help by the clergymen and doctors in the Gateshead and Newcastle upon Tyne areas. There is little doubt that the Davy lamp, from the 1820s onwards, transformed the coal industry worldwide. It also profoundly influenced the science of combustion, and in the words of a pioneer in that field, W. A. Bone, FRS, 'There is no better model of logical experimental procedure, accurate reasoning, philosophical outlook and fine literary expression.' It is a remarkable fact that it took Davy essentially only two weeks from the time he was given samples of fire-damp to solve the problem and to devise his renowned miner's safety lamp. A brief account is also given of the contemporaneous invention of a safety lamp by George Stephenson, and of some of Davy's subsequent accomplishments. This commentary was written to celebrate the 350th anniversary of the journal Philosophical Transactions of the Royal Society.

  11. Sir Humphry Davy and the coal miners of the world: a commentary on Davy (1816) ‘An account of an invention for giving light in explosive mixtures of fire-damp in coal mines’

    PubMed Central

    Thomas, John Meurig

    2015-01-01

    In the period between 1815 and 1818, Sir Humphry Davy read four papers to the Royal Society and published a monograph dealing with a safety lamp for coal miners, all of which record in detail the experimental work that he carried out, with his assistant Michael Faraday, so as to determine how to prevent catastrophic accidents in coal mines by the explosion of fire-damp (methane) in the presence of a naked flame. This article describes the key experiments that he performed at the Royal Institution and some of the subsequent trials made in the coal mines of the north of England. It begins, however, with an account of Davy's prior achievements in science before he was approached for help by the clergymen and doctors in the Gateshead and Newcastle upon Tyne areas. There is little doubt that the Davy lamp, from the 1820s onwards, transformed the coal industry worldwide. It also profoundly influenced the science of combustion, and in the words of a pioneer in that field, W. A. Bone, FRS, ‘There is no better model of logical experimental procedure, accurate reasoning, philosophical outlook and fine literary expression.’ It is a remarkable fact that it took Davy essentially only two weeks from the time he was given samples of fire-damp to solve the problem and to devise his renowned miner's safety lamp. A brief account is also given of the contemporaneous invention of a safety lamp by George Stephenson, and of some of Davy's subsequent accomplishments. This commentary was written to celebrate the 350th anniversary of the journal Philosophical Transactions of the Royal Society. PMID:25750144

  12. The Doctoring Curriculum at the University of California, Davis School of Medicine: Leadership and Participant Roles for Psychiatry Faculty

    ERIC Educational Resources Information Center

    Bourgeois, James A.; Ton, Hendry; Onate, John; McCarthy, Tracy; Stevenson, Frazier T.; Servis, Mark E.; Wilkes, Michael S.

    2008-01-01

    Objective: The authors describe in detail the 3-year model of the Doctoring curriculum plus an elective fourth-year Doctoring course at University of California, Davis School of Medicine (UCDSOM) and University of California, Los Angeles (UCLA) School of Medicine and the critical role for psychiatry faculty leadership and participation. Methods:…

  13. Making the Most of What You've Got: Renovation of the Office of the Registrar, University of California, Davis.

    ERIC Educational Resources Information Center

    Babey, Evelyn R.

    An account of the renovation of the Office of the Registrar at the University of California, Davis, is presented. The task was to redesign existing space to utilize it more effectively; the ultimate goal was to better serve the university community. Placing units that were functionally interdependent in closer proximity and arranging high volume…

  14. Plasma Physics Research Institute, Lawrence Livermore National Laboratory, University of California, Davis annual report for fiscal year 1989

    SciTech Connect

    Killeen, J.; Drake, R.P.

    1991-07-26

    This report discusses: The Davis Diverted Tokamak; Particle Simulation of Transport in Fusion Devices; Astrophysical Plasmas; Statistical Dynamics of Multi-Field Models for Plasma; Large Scale Density Modifications Induced in the Ionosphere; Studies of the Ion Acoustic Decay Instability; and Computer Simulation of Ionospheric Radio Frequency Heating.

  15. 77 FR 70121 - Special Local Regulation; Annual Marine Events on the Colorado River Between Davis Dam (Bullhead...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2012-11-23

    ... From the Federal Register Online via the Government Publishing Office DEPARTMENT OF HOMELAND SECURITY Coast Guard 33 CFR Part 100 Special Local Regulation; Annual Marine Events on the Colorado River Between Davis Dam (Bullhead City, AZ) and Headgate Dam (Parker, AZ) Within the San Diego Captain of...

  16. 77 FR 67563 - Special Local Regulation; Annual Marine Events on the Colorado River, Between Davis Dam (Bullhead...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2012-11-13

    ... From the Federal Register Online via the Government Publishing Office DEPARTMENT OF HOMELAND SECURITY Coast Guard 33 CFR Part 100 Special Local Regulation; Annual Marine Events on the Colorado River, Between Davis Dam (Bullhead City, AZ) and Headgate Dam (Parker, AZ) Within the San Diego Captain of...

  17. 33 CFR 100.1102 - Annual Marine Events on the Colorado River, between Davis Dam (Bullhead City, Arizona) and...

    Code of Federal Regulations, 2014 CFR

    2014-07-01

    ... Colorado River, between Davis Dam (Bullhead City, Arizona) and Headgate Dam (Parker, Arizona). 100.1102... MARINE PARADES SAFETY OF LIFE ON NAVIGABLE WATERS § 100.1102 Annual Marine Events on the Colorado River... portion of the lower Colorado River on the Arizona side between Thompson Bay and Copper Canyon. 2....

  18. "The Color of Justice" by Cheryl L. Davis, Presented by Theatreworks U.S.A. Cue Sheet for Students.

    ERIC Educational Resources Information Center

    Stoudt, Charlotte

    This performance guide is designed for teachers to use with students before and after a performance of "The Color of Justice," by Cheryl L. Davis, the true story of the fight for freedom of an elementary school girl and an outspoken lawyer in the 1950s, and how they teamed up to change forever the way black and white Americans lived and…

  19. How the Bayesians Got Their Beliefs (and What Those Beliefs Actually Are): Comment on Bowers and Davis (2012)

    ERIC Educational Resources Information Center

    Griffiths, Thomas L.; Chater, Nick; Norris, Dennis; Pouget, Alexandre

    2012-01-01

    Bowers and Davis (2012) criticize Bayesian modelers for telling "just so" stories about cognition and neuroscience. Their criticisms are weakened by not giving an accurate characterization of the motivation behind Bayesian modeling or the ways in which Bayesian models are used and by not evaluating this theoretical framework against specific…

  20. How the Bayesians Got Their Beliefs (and What Those Beliefs Actually Are): Comment on Bowers and Davis (2012)

    ERIC Educational Resources Information Center

    Griffiths, Thomas L.; Chater, Nick; Norris, Dennis; Pouget, Alexandre

    2012-01-01

    Bowers and Davis (2012) criticize Bayesian modelers for telling "just so" stories about cognition and neuroscience. Their criticisms are weakened by not giving an accurate characterization of the motivation behind Bayesian modeling or the ways in which Bayesian models are used and by not evaluating this theoretical framework against specific…

  1. The Davis-Beirut Reaction: a novel entry into 2H-indazoles and indazolones. Recent biological activity of indazoles.

    PubMed

    Haddadin, Makhluf J; Conrad, Wayne E; Kurth, Mark J

    2012-10-01

    A novel, easy method for the syntheses of richly diversified 2H-indazoles and indazolones, called the Davis-Beirut reaction, and other recent 2H-indazole synthetic routes are briefly reviewed. An update on the biological activity of indazoles is also surveyed.

  2. The Politics of Normative Childhoods and Non-Normative Parenting: A Response to Cristyn Davies and Kerry Robinson

    ERIC Educational Resources Information Center

    Chapman, Amy; Saltmarsh, Sue

    2013-01-01

    This article offers a consideration of the ways that the politics of normative childhoods are shaped by discourses of happiness predicated on heteronormativity. Responding to the work of Cristyn Davies and Kerry Robinson (2013, this issue), the authors argue that non-normative families and in particular, non-normative parenting, are obliged to…

  3. Muon flux Measurements at the Davis Campus of the Sanford Underground Research Facility with the Majorana Demonstrator Veto System

    DOE PAGES

    Abgrall, N.; Aguayo, E.; Avignone, F. T.; ...

    2017-02-16

    Here, we report the first measurement of the total muon flux underground at the Davis Campus of the Sanford Underground Research Facility at the 4850 ft level. Measurements were performed using the MajoranaDemonstratormuon veto system arranged in two different configurations. The measured total flux is (5.31±0.17)×10–9μ/s/cm2.

  4. HORIZONTAL BOILING REACTOR SYSTEM

    DOEpatents

    Treshow, M.

    1958-11-18

    Reactors of the boiling water type are described wherein water serves both as the moderator and coolant. The reactor system consists essentially of a horizontal pressure vessel divided into two compartments by a weir, a thermal neutronic reactor core having vertical coolant passages and designed to use water as a moderator-coolant posltioned in one compartment, means for removing live steam from the other compartment and means for conveying feed-water and water from the steam compartment to the reactor compartment. The system further includes auxiliary apparatus to utilize the steam for driving a turbine and returning the condensate to the feed-water inlet of the reactor. The entire system is designed so that the reactor is self-regulating and has self-limiting power and self-limiting pressure features.

  5. High energy reactor neutrinos

    NASA Astrophysics Data System (ADS)

    Raper, Neill

    We present the first measurement of a nonzero reactor neutrino flux with energies above 8 MeV. Measurements are taken with the Daya Bay Reactor Neutrino Experiments detectors, using the Guangdong Nuclear Power Station as a source. Disagreement between data and theory regarding rate and shape of reactor neutrino spectra have made the need for direct measurement clear. Data are especially useful at high energies, where far fewer isotopes contribute. Neutrino candidates are correlated to reactor power and reactor power is extrapolated to zero in order to separate neutrino events from background. We find evidence of reactor neutrinos up to ˜12.5 MeV at 1.92 sigma above 0 and include a survey of isotopes likely to be contributing neutrinos in this energy range.

  6. Hybrid reactors. [Fuel cycle

    SciTech Connect

    Moir, R.W.

    1980-09-09

    The rationale for hybrid fusion-fission reactors is the production of fissile fuel for fission reactors. A new class of reactor, the fission-suppressed hybrid promises unusually good safety features as well as the ability to support 25 light-water reactors of the same nuclear power rating, or even more high-conversion-ratio reactors such as the heavy-water type. One 4000-MW nuclear hybrid can produce 7200 kg of /sup 233/U per year. To obtain good economics, injector efficiency times plasma gain (eta/sub i/Q) should be greater than 2, the wall load should be greater than 1 MW.m/sup -2/, and the hybrid should cost less than 6 times the cost of a light-water reactor. Introduction rates for the fission-suppressed hybrid are usually rapid.

  7. Arctic Outflow West Of Greenland: Nine Years Of Volume And Freshwater Transports From Observations In Davis Strait

    NASA Astrophysics Data System (ADS)

    Curry, B.; Lee, C.; Petrie, B.; Moritz, R. E.; Kwok, R.

    2014-12-01

    Recent Arctic changes suggest alterations in the export of freshwater from the Arctic to the North Atlantic, with conceivable impacts on the Atlantic Meridional Overturning circulation. Approximately 50% of the Arctic outflow exits west of Greenland, traveling through the Canadian Arctic Archipelago (CAA) and into Baffin Bay before crossing Davis Strait. The CAA outflow contributes over 50% of the net southward freshwater outflow through Davis Strait. The remainder is deeper outflow from Baffin Bay, flow from the West Greenland Current and runoff from West Greenland and CAA glaciers. Since September 2004, an observational program in Davis Strait has quantified volume and freshwater transport variability. The year-round program includes velocity, temperature and salinity measurements from 15 moorings spanning the full width (330 km) of the strait accompanied by autonomous Seagliders surveys (average profile separation = 4 km) and autumn ship-based hydrographic sections. Over the shallow Baffin Island and West Greenland shelves, moored instrumentation provides temperature and salinity measurements near the ice-ocean interface. From 2004-2013, the average net volume and liquid freshwater transports are -1.6 ± 0.2 Sv, -94 ± 7 mSv, respectively (salinity referenced to 34.8 and negative indicates southward transport); sea ice contributes an additional -10 ± 1 mSv. Over this period, volume and liquid freshwater transports show significant interannual variability and no clear trends, but a comparison with reanalyzed 1987-90 data indicate a roughly 40% decrease in net southward liquid volume transport and a corresponding an almost 30% decrease in freshwater transport. Connections between the Arctic are also captured, e.g., a unique yearlong Davis Strait freshening event starting September 2009 that was likely driven by an earlier freshening (January 2009 - April/May 2010) in the Canadian Arctic. The Davis Strait autumn 2009 salinity minimum was fresher (by about 0

  8. Improved vortex reactor system

    DOEpatents

    Diebold, J.P.; Scahill, J.W.

    1995-05-09

    An improved vortex reactor system is described for affecting fast pyrolysis of biomass and Refuse Derived Fuel (RDF) feed materials comprising: a vortex reactor having its axis vertically disposed in relation to a jet of a horizontally disposed steam ejector that impels feed materials from a feeder and solids from a recycle loop along with a motive gas into a top part of said reactor. 12 figs.

  9. The Integral Fast Reactor

    SciTech Connect

    Chang, Y.I.

    1988-01-01

    The Integral Fast Reactor (IFR) is an innovative liquid metal reactor concept being developed at Argonne National Laboratory. It seeks to specifically exploit the inherent properties of liquid metal cooling and metallic fuel in a way that leads to substantial improvements in the characteristics of the complete reactor system. This paper describes the key features and potential advantages of the IFR concept, with emphasis on its safety characteristics. 3 refs., 4 figs., 1 tab.

  10. NEUTRONIC REACTOR CONTROL

    DOEpatents

    Dreffin, R.S.

    1959-12-15

    A control means for a nuclear reactor is described. Particularly a device extending into the active portion of the reactor consisting of two hollow elements coaxially disposed and forming a channel therebetween, the cross sectional area of the channel increasing from each extremity of the device towards the center thereof. An element of neutron absorbing material is slidably positionable within the inner hollow element and a fluid reactor poison is introduced into the channel defined by the two hollow elements.

  11. NEUTRONIC REACTOR SYSTEM

    DOEpatents

    Goett, J.J.

    1961-01-24

    A system is described which includes a neutronic reactor containing a dispersion of fissionable material in a liquid moderator as fuel and a conveyor to which a portion of the dispersion may be passed and wherein the self heat of the slurry evaporates the moderator. Means are provided for condensing the liquid moderator and returning it to the reactor and for conveying the dried fissionable material away from the reactor.

  12. FLOW SYSTEM FOR REACTOR

    DOEpatents

    Zinn, W.H.

    1963-06-11

    A reactor is designed with means for terminating the reaction when returning coolant is below a predetermined temperature. Coolant flowing from the reactor passes through a heat exchanger to a lower reservoir, and then circulates between the lower reservoir and an upper reservoir before being returned to the reactor. Means responsive to the temperature of the coolant in the return conduit terminate the chain reaction when the temperature reaches a predetermined minimum value. (AEC)

  13. University Reactor Sharing Program

    SciTech Connect

    Dr. W.D. Reece

    1999-09-01

    The University Reactor Sharing Program provides funding for reactor experimentation to institutions that do not normally have access to a research reactor. Research projects supported by the program include items such as dating geological material to producing high current super conducting magnets. The funding also gives small colleges and universities the opportunity to use the facility for teaching courses in nuclear processes; specifically neutron activation analysis and gamma spectroscopy.

  14. Pressurized fluidized bed reactor

    DOEpatents

    Isaksson, Juhani

    1996-01-01

    A pressurized fluid bed reactor power plant includes a fluidized bed reactor contained within a pressure vessel with a pressurized gas volume between the reactor and the vessel. A first conduit supplies primary gas from the gas volume to the reactor, passing outside the pressure vessel and then returning through the pressure vessel to the reactor, and pressurized gas is supplied from a compressor through a second conduit to the gas volume. A third conduit, comprising a hot gas discharge, carries gases from the reactor, through a filter, and ultimately to a turbine. During normal operation of the plant, pressurized gas is withdrawn from the gas volume through the first conduit and introduced into the reactor at a substantially continuously controlled rate as the primary gas to the reactor. In response to an operational disturbance of the plant, the flow of gas in the first, second, and third conduits is terminated, and thereafter the pressure in the gas volume and in the reactor is substantially simultaneously reduced by opening pressure relief valves in the first and third conduits, and optionally by passing air directly from the second conduit to the turbine.

  15. Remote Reactor Monitoring

    SciTech Connect

    Bernstein, Adam; Dazeley, Steve; Dobie, Doug; Marleau, Peter; Brennan, Jim; Gerling, Mark; Sumner, Matthew; Sweany, Melinda

    2014-10-21

    The overall goal of the WATCHMAN project is to experimentally demonstrate the potential of water Cerenkov antineutrino detectors as a tool for remote monitoring of nuclear reactors. In particular, the project seeks to field a large prototype gadolinium-doped, water-based antineutrino detector to demonstrate sensitivity to a power reactor at ~10 kilometer standoff using a kiloton scale detector. The technology under development, when fully realized at large scale, could provide remote near-real-time information about reactor existence and operational status for small operating nuclear reactors out to distances of many hundreds of kilometers.

  16. Pressurized fluidized bed reactor

    DOEpatents

    Isaksson, J.

    1996-03-19

    A pressurized fluid bed reactor power plant includes a fluidized bed reactor contained within a pressure vessel with a pressurized gas volume between the reactor and the vessel. A first conduit supplies primary gas from the gas volume to the reactor, passing outside the pressure vessel and then returning through the pressure vessel to the reactor, and pressurized gas is supplied from a compressor through a second conduit to the gas volume. A third conduit, comprising a hot gas discharge, carries gases from the reactor, through a filter, and ultimately to a turbine. During normal operation of the plant, pressurized gas is withdrawn from the gas volume through the first conduit and introduced into the reactor at a substantially continuously controlled rate as the primary gas to the reactor. In response to an operational disturbance of the plant, the flow of gas in the first, second, and third conduits is terminated, and thereafter the pressure in the gas volume and in the reactor is substantially simultaneously reduced by opening pressure relief valves in the first and third conduits, and optionally by passing air directly from the second conduit to the turbine. 1 fig.

  17. HOMOGENEOUS NUCLEAR POWER REACTOR

    DOEpatents

    King, L.D.P.

    1959-09-01

    A homogeneous nuclear power reactor utilizing forced circulation of the liquid fuel is described. The reactor does not require fuel handling outside of the reactor vessel during any normal operation including complete shutdown to room temperature, the reactor being selfregulating under extreme operating conditions and controlled by the thermal expansion of the liquid fuel. The liquid fuel utilized is a uranium, phosphoric acid, and water solution which requires no gus exhaust system or independent gas recombining system, thereby eliminating the handling of radioiytic gas.

  18. Membrane reactors at Degussa.

    PubMed

    Wöltinger, Jens; Karau, Andreas; Leuchtenberger, Wolfgang; Drauz, Karlheinz

    2005-01-01

    The review covers the development of membrane reactor technologies at Degussa for the synthesis of fine chemicals. The operation of fed-batch or continuous biocatalytic processes in the enzyme membrane reactor (EMR) is well established at Degussa. Degussa has experience of running EMRs from laboratory gram scale up to a production scale of several hundreds of tons per year. The transfer of the enzyme membrane reactor from biocatalysis to chemical catalysis in the chemzyme membrane reactor (CMR) is discussed. Various homogeneous catalysts have been investigated in the CMR, and the scope and limitation of this new technique is discussed.

  19. Aquatic life water quality criteria derived via the UC Davis method: I. Organophosphate insecticides.

    PubMed

    Palumbo, Amanda J; Tenbrook, Patti L; Fojut, Tessa L; Faria, Isabel R; Tjeerdema, Ronald S

    2012-01-01

    A new methodology for deriving freshwater aquatic life water quality criteria,developed by the University of California Davis, was used to derive criteria for three organophosphate insecticides. The UC Davis methodology resulted in similar criteria to other accepted methods, and incorporated new approaches that enable criteria generation in cases where the existing USEPA guidance cannot be used.Acute and chronic water quality criteria were derived for chlorpyrifos (10 and 10 ng/L, respectively), diazinon (200 and 70 ng/L, respectively), and malathion(170 and 28 ng/L, respectively). For acute criteria derivation, Burr Type III SSDs were fitted to the chlorpyrifos and diazinon acute toxicity data sets while an alternative assessment factor procedure was used for malathion because that acute data set did not contain adequate species diversity to use a distribution.ACRs were used to calculate chronic criteria because there was a dearth of chronic data in all cases, especially for malathion, for which there was a lack of paired acute and chronic invertebrate data. Another alternate procedure enabled calculation of the malathion chronic criterion by combining a default ratio with the experimentally derived ratios. A review of the diazinon chronic criterion found it to be under protective of cladoceran species, so a more protective criterion was calculated using a lower distributional estimate. The acute and chronic data sets were assembled using a transparent and consistent system for judging the relevance and reliability of studies, and the individual study review notes are included.The resulting criteria are unique in that they were reviewed to ensure particular protection of sensitive and threatened and endangered species, and mixture toxicity is incorporated into criteria compliance for all three compounds.For chlorpyrifos and diazinon, the UCDM generated criteria similar to the long-standing USEPA (1985) method, with less taxa requirements, a more statistically

  20. NEUTRONIC REACTOR SYSTEM

    DOEpatents

    Treshow, M.

    1959-02-10

    A reactor system incorporating a reactor of the heterogeneous boiling water type is described. The reactor is comprised essentially of a core submerged adwater in the lower half of a pressure vessel and two distribution rings connected to a source of water are disposed within the pressure vessel above the reactor core, the lower distribution ring being submerged adjacent to the uppcr end of the reactor core and the other distribution ring being located adjacent to the top of the pressure vessel. A feed-water control valve, responsive to the steam demand of the load, is provided in the feedwater line to the distribution rings and regulates the amount of feed water flowing to each distribution ring, the proportion of water flowing to the submerged distribution ring being proportional to the steam demand of the load. This invention provides an automatic means exterior to the reactor to control the reactivity of the reactor over relatively long periods of time without relying upon movement of control rods or of other moving parts within the reactor structure.

  1. REFLECTOR FOR NEUTRONIC REACTORS

    DOEpatents

    Fraas, A.P.

    1963-08-01

    A reflector for nuclear reactors that comprises an assembly of closely packed graphite rods disposed with their major axes substantially perpendicular to the interface between the reactor core and the reflector is described. Each graphite rod is round in transverse cross section at (at least) its interface end and is provided, at that end, with a coaxial, inwardly tapering hole. (AEC)

  2. NEUTRONIC REACTOR BURIAL ASSEMBLY

    DOEpatents

    Treshow, M.

    1961-05-01

    A burial assembly is shown whereby an entire reactor core may be encased with lead shielding, withdrawn from the reactor site and buried. This is made possible by a five-piece interlocking arrangement that may be easily put together by remote control with no aligning of bolt holes or other such close adjustments being necessary.

  3. N Reactor hydrogen control

    SciTech Connect

    Shuford, D.H.; Kripps, L.J.

    1988-08-01

    Following the accident at the Chernobyl nuclear power reactor in the Soviet Union, a number of reviews were conducted of the N Reactor. Hydrogen generation during postulates severe accidents and the possibility of resulting hydrogen deflagrations/detonations that could affect confinement integrity were issues raised in several reviews, along with recommendations for adding hydrogen mitigation features. To respond to these reviews, an N Reactor Safety Enhancement Program and a subsequent Accelerated Safety Enhancement Program were initiated to address all post-Chernobyl N Reactor review findings. The Safety Enhancement Program and Accelerated Safety Enhancement Program efforts involving hydrogen control included the following: Calculate the potential hydrogen source for a range of severe accidents at the N Reactor to establish an acceptable design basis for the hydrogen mitigation system; Analyze the N Reactor confinement hydrogen mixing capability to identify areas of concern and to the verify effectiveness of the hydrogen mitigation system; Select, design, and construct a hydrogen mitigation system to enhance the N Reactor capability to accommodate possible hydrogen generation from postulated severe accidents; Provide post-accident hydrogen monitoring as an operator aid in assessing confinement conditions. In additions, it was necessary to verify that incorporation of the hydrogen mitigation system had no adverse impact N Reactor safety (e.g., radiological consequence analyses). 77 refs., 25 figs., 10 tabs.

  4. Polymerization Reactor Engineering.

    ERIC Educational Resources Information Center

    Skaates, J. Michael

    1987-01-01

    Describes a polymerization reactor engineering course offered at Michigan Technological University which focuses on the design and operation of industrial polymerization reactors to achieve a desired degree of polymerization and molecular weight distribution. Provides a list of the course topics and assigned readings. (TW)

  5. The Integral Fast Reactor

    SciTech Connect

    Till, C.E.; Chang, Y.I. ); Lineberry, M.J. )

    1990-01-01

    Argonne National Laboratory, since 1984, has been developing the Integral Fast Reactor (IFR). This paper will describe the way in which this new reactor concept came about; the technical, public acceptance, and environmental issues that are addressed by the IFR; the technical progress that has been made; and our expectations for this program in the near term. 5 refs., 3 figs.

  6. Polymerization Reactor Engineering.

    ERIC Educational Resources Information Center

    Skaates, J. Michael

    1987-01-01

    Describes a polymerization reactor engineering course offered at Michigan Technological University which focuses on the design and operation of industrial polymerization reactors to achieve a desired degree of polymerization and molecular weight distribution. Provides a list of the course topics and assigned readings. (TW)

  7. Light water reactor program

    SciTech Connect

    Franks, S.M.

    1994-12-31

    The US Department of Energy`s Light Water Reactor Program is outlined. The scope of the program consists of: design certification of evolutionary plants; design, development, and design certification of simplified passive plants; first-of-a-kind engineering to achieve commercial standardization; plant lifetime improvement; and advanced reactor severe accident program. These program activities of the Office of Nuclear Energy are discussed.

  8. Status of French reactors

    SciTech Connect

    Ballagny, A.

    1997-08-01

    The status of French reactors is reviewed. The ORPHEE and RHF reactors can not be operated with a LEU fuel which would be limited to 4.8 g U/cm{sup 3}. The OSIRIS reactor has already been converted to LEU. It will use U{sub 3}Si{sub 2} as soon as its present stock of UO{sub 2} fuel is used up, at the end of 1994. The decision to close down the SILOE reactor in the near future is not propitious for the start of a conversion process. The REX 2000 reactor, which is expected to be commissioned in 2005, will use LEU (except if the fast neutrons core option is selected). Concerning the end of the HEU fuel cycle, the best option is reprocessing followed by conversion of the reprocessed uranium to LEU.

  9. REACTOR FUEL SCAVENGING MEANS

    DOEpatents

    Coffinberry, A.S.

    1962-04-10

    A process for removing fission products from reactor liquid fuel without interfering with the reactor's normal operation or causing a significant change in its fuel composition is described. The process consists of mixing a liquid scavenger alloy composed of about 44 at.% plutoniunm, 33 at.% lanthanum, and 23 at.% nickel or cobalt with a plutonium alloy reactor fuel containing about 3 at.% lanthanum; removing a portion of the fuel and scavenger alloy from the reactor core and replacing it with an equal amount of the fresh scavenger alloy; transferring the portion to a quiescent zone where the scavenger and the plutonium fuel form two distinct liquid layers with the fission products being dissolved in the lanthanum-rich scavenger layer; and the clean plutonium-rich fuel layer being returned to the reactor core. (AEC)

  10. Reactor Operations Management Plan

    SciTech Connect

    Rice, P.D.

    1991-12-05

    The K-Reactor last operated in April 1988. At that time, K-Reactor was one of three operating reactors at the Savannah River Site (SRS). Following an incident in P-Reactor in August 1988, it was decided to discontinue SRS reactor operation and conduct an extensive program to upgrade operating practices and plant hardware prior to restart of any of the reactors. The K-reactor was the first of three reactors scheduled to resume production. At the present time, it is the only reactor with planned restart. WSRC assumed management of SRS on April 1, 1989. WSRC established the Safety Basis for Restart and a listing of the actions planned to satisfy the Safety Basis. In consultation with DOE, it was determined that proper management of the restart activities would require a single plan that integrated the numerous activities. The plan was entitled the Reactor Operations Management Plan and is referred to simply as the ROMP. The initial version of ROMP was produced in July of 1989. Subsequent modifications led to Revision 3 which was approved by DOE in May, 1990. Other changes were made in a formal change process, resulting in the latest version, Revision 5, being issued in October, 1990. The ROMP contains three key parts: first, the Restart Safety Basis; second, a description of the process for addressing new technical issues and a listing of the established workscope and the associated acceptance criteria; and three, a schedule for executing the work. I will discuss the first two areas, along with the closure process used to assure the intent of ROMP was met. The ROMP activities are all complete and I will not discuss schedule further.

  11. 75 FR 14635 - FirstEnergy Nuclear Operating Company, Davis-Besse Nuclear Power Station; Environmental...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2010-03-26

    ... (74 FR 13967). There will be no change to radioactive effluents that effect radiation exposures to..., ``Physical protection of plants and ] materials,'' for Facility Operating License No. NPF-3, issued to First... physical changes to the reactor, fuel, plant structures, support structures, water or land at the DBNPS...

  12. A transparent oversight policy for human anatomical specimen management: the University of California, Davis experience.

    PubMed

    Schmitt, Brandi; Wacker, Charlotte; Ikemoto, Lisa; Meyers, Frederick J; Pomeroy, Claire

    2014-03-01

    The authors describe the development and implementation of a University of California (UC) system of oversight, education, tracking, and accountability for human anatomical specimen use in education and research activities. This program was created and initially implemented at UC Davis in 2005. Several incidents arising out of the handling of human anatomical specimens at UC campuses revealed significant challenges in the system for maintaining control of human anatomical specimens used in education and research. These events combined to undermine the public perception for research and educational endeavors involving anatomical materials at public institutions. Risks associated with the acquisition, maintenance, and disposal of these specimens were not fully understood by the faculty, staff, and students who used them. Laws governing sources of specimens are grouped with those that govern organ procurement and tissue banking, and sometimes are found in cemetery and funeral regulations. These variables complicate interpretations and may hinder compliance. To regain confidence in the system, the need to set appropriate and realistic guidelines that mitigate risk and facilitate an institution's research and educational mission was identified. This article chronicles a multiyear process in which diverse stakeholders developed (1) a regulatory policy for oversight, (2) a policy education program, (3) procedures for tracking and accountability, and (4) a reporting and enforcement mechanism for appropriate and ethical use of human anatomical specimens in university education and research.

  13. A magpie with a card-index mind - Charles Davies Sherborn 1861-1942.

    PubMed

    Shindler, Karolyn

    2016-01-01

    Charles Davies Sherborn was geologist, indexer and bibliographer extraordinaire. He was fascinated by science from an early age and like so many Victorians, the young Sherborn was a passionate natural history collector and was obsessed with expanding his collection of land and freshwater shells. He later described himself as being a 'thorough magpie' and having 'a card-index mind', and these two traits coalesced in his monumental Index Animalium, the compilation of which occupied 43 years of his life. One of the first visitors through the doors of the Natural History Museum in South Kensington when it opened in 1881, Sherborn began work there seven years later as one of the small band of unofficial scientific workers, paid by the number of fossils he prepared. By the time of his death in 1942, Sherborn's corner in the Museum was the first port of call for generations of scientists seeking advice, information - or an invitation to one of his famous 'smoke and chat' parties. In addition to his work on the Index, Sherborn is also responsible for rescuing from damp and probable destruction the huge archive of Sir Richard Owen, the great comparative anatomist and the prime mover behind the creation of the Natural History Museum, London. Without Sherborn, this invaluable resource of correspondence, manuscripts and books may well have been irretrievably ruined.

  14. Geology of the Joe Davis Hill quadrangle, Dolores and San Miguel counties, Colorado

    USGS Publications Warehouse

    Cater, Fred W.; Bell, Henry

    1953-01-01

    The Joe Davis Hill quadrangle is one of eighteen 7 1/2-minute quadrangles covering the principal carnotite-producing area of southwestern Colorado. The geology of these quadrangles was mapped by the U.S. Geological Survey for the Atomic Energy Commission as part of a comprehensive study of carnotite deposits. The rocks exposed in the eighteen quadrangles consist of crystalline rocks of pre-Cambrian age and sedimentary rocks that range in age from late Paleozoic to Quaternary. Over much of the area the sedimentary rocks are flat lying, but in places the rocks are disrupted by hih-angle faults, and northwest-trending folds. Conspicuous among the folds are large anticlines having cores of intrusive salt and gypsum. Most of the carnotite deposits are confined to Salt Wash sandstone member of the Jurassic Morrison formation. Within this sandstone, most of the deposits are spottily distributed through an arcuate zone known as the "Uravan Mineral Belt". Individual deposits range in size from irregular masses containing only a few tons of ore to large, tabular masses containing many thousands of tons. The ore consists largely of sandstone selectively impregnated and in part replaced by uranium and vanadium minerals. Most of the deposits appear to be related to certain sedimentary structures in sandstones of favorable composition.

  15. Topographic stress perturbations in southern Davis Mountains, west Texas 1. Polarity reversal of principal stresses

    USGS Publications Warehouse

    Savage, W.Z.; Morin, R.H.

    2002-01-01

    We have applied a previously developed analytical stress model to interpret subsurface stress conditions inferred from acoustic televiewer logs obtained in two municipal water wells located in a valley in the southern Davis Mountains near Alpine, Texas. The appearance of stress-induced breakouts with orientations that shift by 90?? at two different depths in one of the wells is explained by results from exact solutions for the effects of valleys on gravity and tectonically induced subsurface stresses. The theoretical results demonstrate that above a reference depth termed the hinge point, a location that is dependent on Poisson's ratio, valley shape, and magnitude of the maximum horizontal tectonic stress normal to the long axis of the valley, horizontal stresses parallel to the valley axis are greater than those normal to it. At depths below this hinge point the situation reverses and horizontal stresses normal to the valley axis are greater than those parallel to it. Application of the theoretical model at Alpine is accommodated by the fact that nearby earthquake focal mechanisms establish an extensional stress regime with the regional maximum horizontal principal stress aligned perpendicular to the valley axis. We conclude that the localized stress field associated with a valley setting can be highly variable and that breakouts need to be examined in this context when estimating the orientations and magnitudes of regional principal stresses.

  16. The external pixe milliprobe at davis: laser alignment, pixe calibration, and quality assurance

    NASA Astrophysics Data System (ADS)

    Eldred, Robert A.; Kusko, Bruce H.; Cahill, Thomas A.

    1984-04-01

    An external beam PIXE system has been developed at the Davis cyclotron, which is being used extensively for the analysis of the inks and papers of historical documents. This system has several important features. First, because the system is used in valuable and fragile documents, we have kept the heat loss very small. The amount of beam on the sample is minimized by a close detector geometry and by on-demand beam pulsing. A computer driven beam stop allows beam on the sample only when the data is being acquired. Second, the 1 to 2 mm 2 beam spot can be accurately and quickly located at the desired position using a laser alignment system. With this system we can analyze single letters on one side of a page. Third, the beam on sample is internally monitored using the argon present in the 3 cm gap between the exit window and the sample. This is essential for thick targets which stop the beam. Finally, the elemental results are corrected for the decrease of beam energy at the target and for the X-ray attenuation between the target and the detector, and verified by thin standard foils. Similar corrections are made for the finite thickness of the samples. Multiple measurements on the inks of a single page show good consistency, whether done during the same cyclotron run or at another time. Our work indicates that external beam PIXE can be a very safe and accurate tool in historical research.

  17. A magpie with a card-index mind – Charles Davies Sherborn 1861–1942

    PubMed Central

    Shindler, Karolyn

    2016-01-01

    Abstract Charles Davies Sherborn was geologist, indexer and bibliographer extraordinaire. He was fascinated by science from an early age and like so many Victorians, the young Sherborn was a passionate natural history collector and was obsessed with expanding his collection of land and freshwater shells. He later described himself as being a ‘thorough magpie’ and having ‘a card-index mind’, and these two traits coalesced in his monumental Index Animalium, the compilation of which occupied 43 years of his life. One of the first visitors through the doors of the Natural History Museum in South Kensington when it opened in 1881, Sherborn began work there seven years later as one of the small band of unofficial scientific workers, paid by the number of fossils he prepared. By the time of his death in 1942, Sherborn’s corner in the Museum was the first port of call for generations of scientists seeking advice, information – or an invitation to one of his famous ‘smoke and chat’ parties. In addition to his work on the Index, Sherborn is also responsible for rescuing from damp and probable destruction the huge archive of Sir Richard Owen, the great comparative anatomist and the prime mover behind the creation of the Natural History Museum, London. Without Sherborn, this invaluable resource of correspondence, manuscripts and books may well have been irretrievably ruined. PMID:26877651

  18. Superfund Record of Decision (EPA Region 4): Davie Landfill, Broward County, Florida, September 1985. Final report

    SciTech Connect

    Not Available

    1985-09-30

    The Broward County Solid Waste Disposal facility (a.k.a. Davie Landfill) is located 10 miles southwest of Fort Lauderdale, Florida near the intersection of Orange Drive and Boy Scout Road. The landfill, area includes a 50-acre garbage landfill, an 80-acre trash landfill and a 56-acre sludge lagoon. The facility began operation in 1964 accepting trash and ash from the county's adjacent garbage incinerator. In November 1971, the lagoon was created in an unlined natural depression onsite. Grease-trap pumpouts, septic-tank, and treated municipal sludges were disposed in the lagoon which contains an estimated 75,000 cubic yards of sludge. Initial sampling of the lagoon contents characterize the waste as being in the high range of typical wastewater-treatment-plant-sludge hazardous constituents. In addition, concerns have been raised about the relatively high cyanide and sulfide concentrations detected. The selected remedial action includes: dewatering and stabilization of the sludge lagoon contents and placement in a single-lined sanitary landfill cell; and installation of a cap on the cell that meets the regulatory requirements of 40 CFR 264.310(a). This ROD addresses only source control measures. The decision concerning cleanup of groundwater contamination will be made following an evaluation of these actions and monitoring data. Total capital cost for the selected remedial action is estimated to be $3.0-$3.7 million with annual OandM costs of $100,000.

  19. Accident investigation of the electrical shock incident at the PG and E PVUSA site Davis, California

    SciTech Connect

    Jacobson, L.; Moskowitz, P.D.; Garrett, J.O.; Tyler, R.

    1992-02-01

    This report summarizes the findings of the Accident Investigation Team (Team) assembled in response to a request from Pacific Gas and Electric Company (PG and E) to the US Department of Energy (DOE) to understand the events surrounding the electric shock of a worker at the PVUSA site in Davis, California and to provide recommendations to prevent such events from recurring. The report gives complete details on the sequence of events surrounding the accident and identifies 27 facts related to accident itself. Four technical deficiencies in the electrical systems which require further investigation were identified. The Team believes that the root cause of this accident was related to the absence of a proactive organizational entity responsible for overall health and safety on the site. Two contributing factors were identified. First, the prototype nature and associated operational difficulties of the electrical inverter resulted in large maintenance demands. Second, several of the injured employee`s co-workers noted that he occasionally failed to use appropriate personal protective equipment, but they never reported this practice to management. The direct cause of this accident was the failure of the injured employee to wear appropriate personal protective equipment (i.e., rubber gloves). Based on the review of the facts established in this investigation, five recommendations are presented to the funding agencies to reduce the possibility of future accidents at the PVUSA site.

  20. "Agricultural Chymistry is at present in it's infancy": The Board of Agriculture, The Royal Institution and Humphry Davy.

    PubMed

    James, Frank A J L

    2015-01-01

    In this paper I sketch the institutional interactions between the Board of Agriculture and the Royal Institution in the late eighteenth and early nineteenth centuries. This includes analysing the composition of memberships and committees of both bodies in which, inter alia, I challenge Morris Berman's account of their institutional relations. A key figure was Humphry Davy who, because of his career ambitions, occupied a slightly uncomfortable position as Professor of Chemistry to both organisations. Davy's lecture notebooks and his subsequent publication Elements of Agricultural Chemistry reveal that he drew almost all his direct knowledge of the subject from Britain and Ireland. Yet, despite such parochial shortcomings that might be expected of an infant science at time of war, the popularity of his book, particularly in North America, provided continuity between the end of the Board of Agriculture in 1822 and the start of the impact of Justus Liebig's work in the 1840s.

  1. REACTOR BASE, SOUTHEAST CORNER. INTERIOR WILL CONTAIN REACTOR TANK, COOLING ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    REACTOR BASE, SOUTHEAST CORNER. INTERIOR WILL CONTAIN REACTOR TANK, COOLING WATER PIPES, COOLING AIR DUCTS, AND SHIELDING. INL NEGATIVE NO. 776. Unknown Photographer, 10/1950 - Idaho National Engineering Laboratory, Test Reactor Area, Materials & Engineering Test Reactors, Scoville, Butte County, ID

  2. Nuclear reactor control column

    DOEpatents

    Bachovchin, Dennis M.

    1982-01-01

    The nuclear reactor control column comprises a column disposed within the nuclear reactor core having a variable cross-section hollow channel and containing balls whose vertical location is determined by the flow of the reactor coolant through the column. The control column is divided into three basic sections wherein each of the sections has a different cross-sectional area. The uppermost section of the control column has the greatest cross-sectional area, the intermediate section of the control column has the smallest cross-sectional area, and the lowermost section of the control column has the intermediate cross-sectional area. In this manner, the area of the uppermost section can be established such that when the reactor coolant is flowing under normal conditions therethrough, the absorber balls will be lifted and suspended in a fluidized bed manner in the upper section. However, when the reactor coolant flow falls below a predetermined value, the absorber balls will fall through the intermediate section and into the lowermost section, thereby reducing the reactivity of the reactor core and shutting down the reactor.

  3. Reactor Safety Research Programs

    SciTech Connect

    Edler, S. K.

    1981-07-01

    This document summarizes the work performed by Pacific Northwest Laboratory (PNL) from January 1 through March 31, 1981, for the Division of Reactor Safety Research within the U.S. Nuclear Regulatory Commission (NRC). Evaluations of nondestructive examination (NDE) techniques and instrumentation are reported; areas of investigation include demonstrating the feasibility of determining the strength of structural graphite, evaluating the feasibility of detecting and analyzing flaw growth in reactor pressure boundary systems, examining NDE reliability and probabilistic fracture mechanics, and assessing the integrity of pressurized water reactor (PWR) steam generator tubes where service-induced degradation has been indicated. Experimental data and analytical models are being provided to aid in decision-making regarding pipeto- pipe impacts following postulated breaks in high-energy fluid system piping. Core thermal models are being developed to provide better digital codes to compute the behavior of full-scale reactor systems under postulated accident conditions. Fuel assemblies and analytical support are being provided for experimental programs at other facilities. These programs include loss-ofcoolant accident (LOCA) simulation tests at the NRU reactor, Chalk River, Canada; fuel rod deformation, severe fuel damage, and postaccident coolability tests for the ESSOR reactor Super Sara Test Program, Ispra, Italy; the instrumented fuel assembly irradiation program at Halden, Norway; and experimental programs at the Power Burst Facility, Idaho National Engineering Laboratory (INEL). These programs will provide data for computer modeling of reactor system and fuel performance during various abnormal operating conditions.

  4. Slurry reactor design studies

    SciTech Connect

    Fox, J.M.; Degen, B.D.; Cady, G.; Deslate, F.D.; Summers, R.L. ); Akgerman, A. ); Smith, J.M. )

    1990-06-01

    The objective of these studies was to perform a realistic evaluation of the relative costs of tublar-fixed-bed and slurry reactors for methanol, mixed alcohols and Fischer-Tropsch syntheses under conditions where they would realistically be expected to operate. The slurry Fischer-Tropsch reactor was, therefore, operated at low H{sub 2}/CO ratio on gas directly from a Shell gasifier. The fixed-bed reactor was operated on 2.0 H{sub 2}/CO ratio gas after adjustment by shift and CO{sub 2} removal. Every attempt was made to give each reactor the benefit of its optimum design condition and correlations were developed to extend the models beyond the range of the experimental pilot plant data. For the methanol design, comparisons were made for a recycle plant with high methanol yield, this being the standard design condition. It is recognized that this is not necessarily the optimum application for the slurry reactor, which is being proposed for a once-through operation, coproducing methanol and power. Consideration is also given to the applicability of the slurry reactor to mixed alcohols, based on conditions provided by Lurgi for an Octamix{trademark} plant using their standard tubular-fixed reactor technology. 7 figs., 26 tabs.

  5. Testing and evaluation of a moisture separator drain demineralizer at Davis-Besse Nuclear Station. Final report

    SciTech Connect

    Mills, W.D.; Briden, D.W.; Scott, R.J.; Edwards, R.D.; Koch, D.W.; Lamanna, L.S.

    1994-04-01

    Davis-Besse operating data, obtained using the plant`s Chemistry Data Acquisition and Management System (CDAMS) show that by polishing 15--20% of the moisture separator drains the entire drain flow can be pumped forward, saving 5.4 MWe of plant output. Concurrently, the useful lifetimes of condensate polishers were extended by factors of about 6, reducing resin replacement costs by approximately $450,000 per year.

  6. A stable and accurate Davies-like relaxation procedure using multiple penalty terms for lateral boundary conditions

    NASA Astrophysics Data System (ADS)

    Frenander, Hannes; Nordström, Jan

    2016-03-01

    A lateral boundary treatment using summation-by-parts operators and simultaneous approximation terms is introduced. The method is similar to Davies relaxation technique used in the weather prediction community and have similar areas of application, but is also provably stable. In this paper, it is shown how this technique can be applied to the shallow water equations, and that it reduces the errors in the computational domain.

  7. NUCLEAR REACTOR FUEL SYSTEMS

    DOEpatents

    Thamer, B.J.; Bidwell, R.M.; Hammond, R.P.

    1959-09-15

    Homogeneous reactor fuel solutions are reported which provide automatic recombination of radiolytic gases and exhibit large thermal expansion characteristics, thereby providing stability at high temperatures and enabling reactor operation without the necessity of apparatus to recombine gases formed by the radiolytic dissociation of water in the fuel and without the necessity of liquid fuel handling outside the reactor vessel except for recovery processes. The fuels consist of phosphoric acid and water solutions of enriched uranium, wherein the uranium is in either the hexavalent or tetravalent state.

  8. NEUTRONIC REACTOR CONTROL

    DOEpatents

    Metcalf, H.E.

    1958-10-14

    Methods of controlling reactors are presented. Specifically, a plurality of neutron absorber members are adjustably disposed in the reactor core at different distances from the center thereof. The absorber members extend into the core from opposite faces thereof and are operated by motive means coupled in a manner to simultaneously withdraw at least one of the absorber members while inserting one of the other absorber members. This feature effects fine control of the neutron reproduction ratio by varying the total volume of the reactor effective in developing the neutronic reaction.

  9. Microfluidic electrochemical reactors

    SciTech Connect

    Nuzzo, Ralph G; Mitrovski, Svetlana M

    2011-03-22

    A microfluidic electrochemical reactor includes an electrode and one or more microfluidic channels on the electrode, where the microfluidic channels are covered with a membrane containing a gas permeable polymer. The distance between the electrode and the membrane is less than 500 micrometers. The microfluidic electrochemical reactor can provide for increased reaction rates in electrochemical reactions using a gaseous reactant, as compared to conventional electrochemical cells. Microfluidic electrochemical reactors can be incorporated into devices for applications such as fuel cells, electrochemical analysis, microfluidic actuation, pH gradient formation.

  10. Nuclear reactor reflector

    DOEpatents

    Hopkins, R.J.; Land, J.T.; Misvel, M.C.

    1994-06-07

    A nuclear reactor reflector is disclosed that comprises a stack of reflector blocks with vertical water flow passages to cool the reflector. The interface between blocks is opposite support points for reactor fuel rods. Water flows between the reflector and the reactor barrel from passages in a bottom block. The top block contains a flange to limit this flow and the flange has a slot to receive an alignment pin that is welded to the barrel. The pin is held in the slot by two removable shims. Alignment bars extend the length of the stack in slots machined in each block when the stack is assembled. 12 figs.

  11. Nuclear reactor reflector

    DOEpatents

    Hopkins, Ronald J.; Land, John T.; Misvel, Michael C.

    1994-01-01

    A nuclear reactor reflector is disclosed that comprises a stack of reflector blocks with vertical water flow passages to cool the reflector. The interface between blocks is opposite support points for reactor fuel rods. Water flows between the reflector and the reactor barrel from passages in a bottom block. The top block contains a flange to limit this flow and the flange has a slot to receive an alignment pin that is welded to the barrel. The pin is held in the slot by two removable shims. Alignment bars extend the length of the stack in slots machined in each block when the stack is assembled.

  12. COOLED NEUTRONIC REACTOR

    DOEpatents

    Binner, C.R.; Wilkie, C.B.

    1958-03-18

    This patent relates to a design for a reactor of the type in which a fluid coolant is flowed through the active portion of the reactor. This design provides for the cooling of the shielding material as well as the reactor core by the same fluid coolant. The core structure is a solid moderator having coolant channels in which are disposed the fuel elements in rod or slug form. The coolant fluid enters the chamber in the shield, in which the core is located, passes over the inner surface of said chamber, enters the core structure at the center, passes through the coolant channels over the fuel elements and out through exhaust ducts.

  13. REACTOR CONTROL SYSTEM

    DOEpatents

    MacNeill, J.H.; Estabrook, J.Y.

    1960-05-10

    A reactor control system including a continuous tape passing through a first coolant passageway, over idler rollers, back through another parallel passageway, and over motor-driven rollers is described. Discrete portions of fuel or poison are carried on two opposed active sections of the tape. Driving the tape in forward or reverse directions causes both active sections to be simultaneously inserted or withdrawn uniformly, tending to maintain a more uniform flux within the reactor. The system is particularly useful in mobile reactors, where reduced inertial resistance to control rod movement is important.

  14. Retrofit Russian research reactors

    SciTech Connect

    Mabe, W.

    1993-04-01

    A likely source for enriched uranium for production of a gun-type bomb might be a research reactor. A state or terrorist organization would find the technical process for separating uranium from the reactor fuel plates is simple and well-published. An unguarded research reactor could be found in the former Soviet Union. Russia and the former republics have seen an increasing number of terrorist incidents, including hijackings and bombings. Recognizing the danger, Russia and the U.S. have explored means of safeguarding former Soviet weapons materials. This article describes some of the plans to reduce the risk of nuclear materials being obtained for illicit weapons production.

  15. Fast Breeder Reactor studies

    SciTech Connect

    Till, C.E.; Chang, Y.I.; Kittel, J.H.; Fauske, H.K.; Lineberry, M.J.; Stevenson, M.G.; Amundson, P.I.; Dance, K.D.

    1980-07-01

    This report is a compilation of Fast Breeder Reactor (FBR) resource documents prepared to provide the technical basis for the US contribution to the International Nuclear Fuel Cycle Evaluation. The eight separate parts deal with the alternative fast breeder reactor fuel cycles in terms of energy demand, resource base, technical potential and current status, safety, proliferation resistance, deployment, and nuclear safeguards. An Annex compares the cost of decommissioning light-water and fast breeder reactors. Separate abstracts are included for each of the parts.

  16. Spherical torus fusion reactor

    DOEpatents

    Martin Peng, Y.K.M.

    1985-10-03

    The object of this invention is to provide a compact torus fusion reactor with dramatic simplification of plasma confinement design. Another object of this invention is to provide a compact torus fusion reactor with low magnetic field and small aspect ratio stable plasma confinement. In accordance with the principles of this invention there is provided a compact toroidal-type plasma confinement fusion reactor in which only the indispensable components inboard of a tokamak type of plasma confinement region, mainly a current conducting medium which carries electrical current for producing a toroidal magnet confinement field about the toroidal plasma region, are retained.

  17. CONTROL FOR NEUTRONIC REACTOR

    DOEpatents

    Lichtenberger, H.V.; Cameron, R.A.

    1959-03-31

    S>A control rod operating device in a nuclear reactor of the type in which the control rod is gradually withdrawn from the reactor to a position desired during stable operation is described. The apparatus is comprised essentially of a stop member movable in the direction of withdrawal of the control rod, a follower on the control rod engageable with the stop and means urging the follower against the stop in the direction of withdrawal. A means responsive to disengagement of the follower from the stop is provided for actuating the control rod to return to the reactor shut-down position.

  18. Identification of shared antigenic determinants of different polypeptides from Davis and Towne cytomegalovirus strains with monoclonal antibodies.

    PubMed

    Chardonnet, Y; Léry, X; Revillard, J P

    1983-01-01

    Six colonies producing antibodies were obtained by fusing mouse myeloma SP2-O cells with spleen cells from mice immunized with cytomegalovirus Davis strain. Among 88 surviving clones, 29 produced antibodies detectable by immunofluorescence on infected MRC5 cells and 2 others produced neutralizing antibodies against a homologous virus. Supernatants from these 31 positive clones and 4 others which were negative in immunofluorescence or neutralization were tested for their capacity to bind polypeptides from labelled Davis-infected cell extracts. Only 8 were found to be positive: five clones (A8, E3, F2, F8 and F20) precipitated 76 K, 60 K and 54 K bands; three others (A4, B9 and C24) precipitated 76 K and 54 K only. Surprisingly, these 8 monoclonal antibodies recognized a unique polypeptide 67 K of Towne-infected MRC5 cells. No correlation was found between (1) the pattern of fluorescence on MRC5 cells infected with Davis strain, (2) the neutralizing activity, and (3) the polypeptides recognized by the monoclonal antibodies.

  19. NEUTRONIC REACTOR STRUCTURE

    DOEpatents

    Daniels, F.

    1961-10-24

    A reactor core, comprised of vertical stacks of hexagonal blocks of beryllium oxide having axial cylindrical apertures extending therethrough and cylindrical rods of a sintered mixture of uranium dioxide and beryllium oxide, is described. (AEC)

  20. Reactor Neutrino Spectra

    NASA Astrophysics Data System (ADS)

    Hayes, Anna C.; Vogel, Petr

    2016-10-01

    We present a review of the antineutrino spectra emitted from reactors. Knowledge of these spectra and their associated uncertainties is crucial for neutrino oscillation studies. The spectra used to date have been determined either by converting measured electron spectra to antineutrino spectra or by summing over all of the thousands of transitions that make up the spectra, using modern databases as input. The uncertainties in the subdominant corrections to β-decay plague both methods, and we provide estimates of these uncertainties. Improving on current knowledge of the antineutrino spectra from reactors will require new experiments. Such experiments would also address the so-called reactor neutrino anomaly and the possible origin of the shoulder observed in the antineutrino spectra measured in recent high-statistics reactor neutrino experiments.

  1. Packed Bed Reactor Experiment

    NASA Image and Video Library

    The purpose of the Packed Bed Reactor Experiment in low gravity is to determine how a mixture of gas and liquid flows through a packed bed in reduced gravity. A packed bed consists of a metal pipe ...

  2. NEUTRONIC REACTOR FUEL COMPOSITION

    DOEpatents

    Thurber, W.C.

    1961-01-10

    Uranium-aluminum alloys in which boron is homogeneously dispersed by adding it as a nickel boride are described. These compositions have particular utility as fuels for neutronic reactors, boron being present as a burnable poison.

  3. Catalytic Hydrogenation Retrofit Reactor

    SciTech Connect

    2001-02-01

    New Fixed-Bed Catalyst System Provides Significant Reduction in Energy and Hazard Exposure. Hydrogenation is an essential industrial reaction that is often performed using a slurry catalyst system in large stirred-tank reactors.

  4. The environmental impact of sewage and wastewater outfalls in Antarctica: An example from Davis station, East Antarctica.

    PubMed

    Stark, Jonathan S; Corbett, Patricia A; Dunshea, Glenn; Johnstone, Glenn; King, Catherine; Mondon, Julie A; Power, Michelle L; Samuel, Angelingifta; Snape, Ian; Riddle, Martin

    2016-11-15

    We present a comprehensive scientific assessment of the environmental impacts of an Antarctic wastewater ocean outfall, at Davis station in East Antarctica. We assessed the effectiveness of current wastewater treatment and disposal requirements under the Protocol on Environmental Protection to the Antarctic Treaty. Macerated wastewater has been discharged from an outfall at Davis since the failure of the secondary treatment plant in 2005. Water, sediment and wildlife were tested for presence of human enteric bacteria and antibiotic resistance mechanisms. Epibiotic and sediment macrofaunal communities were tested for differences between sites near the outfall and controls. Local fish were examined for evidence of histopathological abnormalities. Sediments, fish and gastropods were tested for uptake of sewage as measured by stable isotopes of N and C. Escherichia coli carrying antibiotic resistance determinants were found in water, sediments and wildlife (the filter feeding bivalve Laternula eliptica). Fish (Trematomus bernacchii) within close proximity to the outfall had significantly more severe and greater occurrences of histopathological abnormalities than at controls, consistent with exposure to sewage. There was significant enrichment of (15)N in T. bernacchii and the predatory gastropod Neobuccinum eatoni around the outfall, providing evidence of uptake of sewage. There were significant differences between epibiotic and sediment macrofaunal communities at control and outfall sites (<1.5 km), when sites were separated into groups of similar habitat types. Benthic community composition was also strongly related to habitat and environmental drivers such as sea ice. The combined evidence indicated that the discharge of wastewater from the Davis outfall is causing environmental impacts. These findings suggest that conditions in Antarctic coastal locations, such as Davis, are unlikely to be conducive to initial dilution and rapid dispersal of wastewater as

  5. Molten metal reactors

    SciTech Connect

    Bingham, Dennis N; Klingler, Kerry M; Turner, Terry D; Wilding, Bruce M

    2013-11-05

    A molten metal reactor for converting a carbon material and steam into a gas comprising hydrogen, carbon monoxide, and carbon dioxide is disclosed. The reactor includes an interior crucible having a portion contained within an exterior crucible. The interior crucible includes an inlet and an outlet; the outlet leads to the exterior crucible and may comprise a diffuser. The exterior crucible may contain a molten alkaline metal compound. Contained between the exterior crucible and the interior crucible is at least one baffle.

  6. Compact power reactor

    DOEpatents

    Wetch, Joseph R.; Dieckamp, Herman M.; Wilson, Lewis A.

    1978-01-01

    There is disclosed a small compact nuclear reactor operating in the epithermal neutron energy range for supplying power at remote locations, as for a satellite. The core contains fuel moderator elements of Zr hydride with 7 w/o of 93% enriched uranium alloy. The core has a radial beryllium reflector and is cooled by liquid metal coolant such as NaK. The reactor is controlled and shut down by moving portions of the reflector.

  7. K-Reactor readiness

    SciTech Connect

    Rice, P.D.

    1991-12-04

    This document describes some of the more significant accomplishments in the reactor restart program and details the magnitude and extent of the work completed to bring K-Reactor to a state of restart readiness. The discussion of restart achievements is organized into the three major categories of personnel, programs, and plant. Also presented is information on the scope and extent of internal and external oversight of the efforts, as well as some details on the startup plan.

  8. Future reactor experiments

    SciTech Connect

    Wen, Liangjian

    2015-07-15

    The non-zero neutrino mixing angle θ{sub 13} has been discovered and precisely measured by the current generation short-baseline reactor neutrino experiments. It opens the gate of measuring the leptonic CP-violating phase and enables the neutrino mass ordering. The JUNO and RENO-50 proposals aim at resolving the neutrino mass ordering using reactors. The experiment design, physics sensitivity, technical challenges as well as the progresses of those two proposed experiments are reviewed in this paper.

  9. K-Reactor readiness

    SciTech Connect

    Rice, P.D.

    1991-12-04

    This document describes some of the more significant accomplishments in the reactor restart program and details the magnitude and extent of the work completed to bring K-Reactor to a state of restart readiness. The discussion of restart achievements is organized into the three major categories of personnel, programs, and plant. Also presented is information on the scope and extent of internal and external oversight of the efforts, as well as some details on the startup plan.

  10. Volcanic stratigraphy of the Barrel Springs--Wild Cherry Formations, Davis Mountains, Trans-Pecos Texas

    SciTech Connect

    Parker, D.F. . Dept. Geology); Henry, C.D. . Bureau of Economic Geology); Kunk, M.J. )

    1993-02-01

    Detailed mapping, stratigraphy, [sup 40]Ar/[sup 39]Ar ages, and geochemistry allow, for the first time, a coherent volcanic history of the Barrel Springs--Wild Cherry (BS-WC) units, the most widespread of the Davis Mountains volcanic field (DMVF). These units erupted dominantly from the [approximately] 20 km-diameter Paradise Mountain caldera (PMC), in the west-central DMVF, where thick, locally silicified and kaolinized intracaldera tuffs and interbedded lavas were resurgently domed by an 8 x 5-km-diameter syenitic intrusion. BS-WC units, all rhyolites, consist dominantly of a lower, moderately porphyritic ash-flow tuff; a petrographically similar, middle ash-flow tuff; and an upper group of voluminous, abundantly porphyritic lavas. The lower ash-flow tuff is strongly rheomorphic throughout its occurrence. The middle ash-flow is also rheomorphic in thick outcrops near the PMC but not in thin ([<=]10m), distal outcrops. These three units are interbedded with lavas lithologically similar to the tuffs near the PMC and with volcaniclastic sedimentary rocks in more distal area. The two ash-flow tuffs are separated by strongly porphyritic trachyte lavas of the Mount Locke Formation in the vicinity of the PMC. Sources and extents of individual flows of the upper lavas have not been positively identified. [sup 40]Ar/[sup 39]Ar ages of alkali feldspar phenocrysts from thirteen samples constrain most BS-WC to a 300 ka span. The lower tuff erupted about 35.6 Ma. The middle tuff and part of the voluminous lava package erupted at 35.3 Ma. Ages of two lavas are 35.1 Ma, which suggests prolonged eruption. Correlations based on lithology and age relations are supplemented by trace element and mineral studies that confirm close geochemical affinities.

  11. North Plant co-generation project for South Davis County Sewer Improvement District

    SciTech Connect

    Rogers, L.S.

    1993-12-31

    In the summer of 1988, the South Davis County Sewer Improvement District (SDCSID) learned of a grant/loan program being administered by the Utah State Department of Energy(DOE) for projects that demonstrate new and innovative ways of conserving energy or utilizing renewable energy sources. The SDCSID applied for and received from the DOE both a grant and a no-interest loan to finance half of the cost of a co-generation project at the North Wastewater Treatment Plant. This co-generation project utilizes methane gas, a by-product of the anaerobic digestion process, to generate both electricity and heat that is used at the plant. The SDCSID calculated that at the current anaerobic gas production rate, a 140 KW engine generator could be run almost 24 hours a day. Approximately 75% of the current electrical needs at the North Plant are supplied by the 140 KW engine generator. Also, all of the heat necessary to raise the temperature of the incoming sludge to 95{degrees}F, and to heat four large buildings is supplied from the heat recovery system of the engine. The system utilizes an induction type generator to supply electricity, which is somewhat simpler to design and less expensive to install than a synchronous type system. An induction system utilizes the Electrical Utility`s incoming power to excite the generator to correct the phase so that is can be used by the loads in the plant. In addition, the SDCSID installed a second identical engine generator as a back-up and to peak shave. Plant effluent is used to cool the engines instead of air-cooling through radiators.

  12. 1995 annual water monitoring report, LEHR environmental restoration, University of California at Davis

    SciTech Connect

    Stewart, D.L.; Smith, R.M.; Sauer, D.R.

    1996-03-01

    This 1995 Annual Water Monitoring Report presents analytical data collected between January and December 1995 at the Laboratory for Energy-Related Health Research (LEHR) located at the University of California (UC), Davis. This report has been prepared by Pacific Northwest National Laboratory in compliance with the Water Monitoring Plan for the LEHR site, which contains the sample collection, analysis, and quality assurance/quality control procedures and reporting requirements. Water monitoring during 1995 was conducted in conjunction with the Remedial Investigation/Feasibility Study currently being implemented at the LEHR site as part of a US Department of Energy (DOE)-sponsored environmental restoration program. Based on a review of historical groundwater monitoring data compiled since the fall of 1990, the list of analytes included in the program was reduced and the schedule for analyzing the remaining analytes was revised. The revision was implemented for the first time in the summer monitoring period. Analytes eliminated from the program were those that were (1) important for establishing baseline groundwater chemistry (alkalinity, anions, Eh, total organic carbon, and chemical oxygen demand); (2) important for establishing sources of contamination; (3) not detected in water samples or not from the LEHR site; and (4) duplicates of another measurement. Reductions in the analytical schedule were based on the monitoring history for each well; the resultant constituents of concern list was developed for individual wells. Depending on its importance in a well, each analyte was analyzed quarterly, semi-annually, or annually. Pollutants of major concern include organic compounds, metals, and radionuclides.

  13. Geomorphology and failure history of the earthquake-induced Farmington Siding landslide complex, Davis County, Utah

    SciTech Connect

    Lowe, M.; Harty, K.M. )

    1993-04-01

    The Farmington Siding landslide complex covers an area of 19.5 km[sup 2] in central Davis County. First identified and mapped in the 1970s, the feature was classified by previous researchers as a liquefaction-induced lateral spread based on surface geomorphology and exposures on the landslide complex. This was the first landslide in Utah to be attributed to earthquake-induced liquefaction. Geomorphic and geologic evidence indicate that the Farmington Sliding landslide complex likely consists of liquefaction-induced landslides that failed by means of both flow failure and lateral spreading. The landslide complex is located in an area underlain primarily by fine-grained deposits of Pleistocene Lake Bonneville and Holocene Great Salt Lake. Geomorphic features of the landslide complex include main and minor scarps, hummocks, closed depressions, and transverse lineaments. The main scarp consists mostly of a series of arcuate scallops near the left flank of the landslide, but it is a relatively linear, single scarp near the right flank of the landslide. Hummocks and closed depressions are most common near the head region of the landslide complex. Failure of the Farmington Sliding landslide complex has occurred at least twice. The older, distal portion of the landslide complex is cut by the Gilbert shoreline of the Bonneville lake cycle, indicating that landsliding occurred more than 10,000 years ago. In the younger portion of the landslide complex, landsliding has disrupted the Gilbert shoreline. Radiocarbon age estimates from trenches on a hummock near the main scarp of the younger landslide indicate that slope failure occurred sometime between about 2,730 [+-] 370 cal. yr B.P. and 4,530 [+-] 300 cal. yr B.P., possibly during the penultimate or antepenultimate surface-faulting earthquake on the Weber segment of the Wasatch fault zone.

  14. NEUTRONIC REACTOR CONSTRUCTION AND OPERATION

    DOEpatents

    West, J.M.; Weills, J.T.

    1960-03-15

    A method is given for operating a nuclear reactor having a negative coefficient of reactivity to compensate for the change in reactor reactivity due to the burn-up of the xenon peak following start-up of the reactor. When it is desired to start up the reactor within less than 72 hours after shutdown, the temperature of the reactor is lowered prior to start-up, and then gradually raised after start-up.

  15. F Reactor Inspection

    ScienceCinema

    Grindstaff, Keith; Hathaway, Boyd; Wilson, Mike

    2016-07-12

    Workers from Mission Support Alliance, LLC., removed the welds around the steel door of the F Reactor before stepping inside the reactor to complete its periodic inspection. This is the first time the Department of Energy (DOE) has had the reactor open since 2008. The F Reactor is one of nine reactors along the Columbia River at the Department's Hanford Site in southeastern Washington State, where environmental cleanup has been ongoing since 1989. As part of the Tri-Party Agreement, the Department completes surveillance and maintenance activities of cocooned reactors periodically to evaluate the structural integrity of the safe storage enclosure and to ensure confinement of any remaining hazardous materials. "This entry marks a transition of sorts because the Hanford Long-Term Stewardship Program, for the first time, was responsible for conducting the entry and surveillance and maintenance activities," said Keith Grindstaff, Energy Department Long-Term Stewardship Program Manager. "As the River Corridor cleanup work is completed and transitioned to long-term stewardship, our program will manage any on-going requirements."

  16. F Reactor Inspection

    SciTech Connect

    Grindstaff, Keith; Hathaway, Boyd; Wilson, Mike

    2014-10-29

    Workers from Mission Support Alliance, LLC., removed the welds around the steel door of the F Reactor before stepping inside the reactor to complete its periodic inspection. This is the first time the Department of Energy (DOE) has had the reactor open since 2008. The F Reactor is one of nine reactors along the Columbia River at the Department's Hanford Site in southeastern Washington State, where environmental cleanup has been ongoing since 1989. As part of the Tri-Party Agreement, the Department completes surveillance and maintenance activities of cocooned reactors periodically to evaluate the structural integrity of the safe storage enclosure and to ensure confinement of any remaining hazardous materials. "This entry marks a transition of sorts because the Hanford Long-Term Stewardship Program, for the first time, was responsible for conducting the entry and surveillance and maintenance activities," said Keith Grindstaff, Energy Department Long-Term Stewardship Program Manager. "As the River Corridor cleanup work is completed and transitioned to long-term stewardship, our program will manage any on-going requirements."

  17. Reactor Safety Research Programs

    SciTech Connect

    Dotson, CW

    1980-08-01

    This document summarizes the work performed by Pacific Northwest laboratory from October 1 through December 31, 1979, for the Division of Reactor Safety Research within the Nuclear Regulatory Commission. Evaluation of nondestructive examination (NDE) techniques and instrumentation are reported; areas of investigation include demonstrating the feasibilty of determining structural graphite strength, evaluating the feasibilty of detecting and analyzing flaw growth in reactor pressure boundary systems, examining NDE reliability and probabilistic fracture mechanics, and assessing the remaining integrity of pressurized water reactor steam generator tubes where service-induced degradation has been indicated. Test assemblies and analytical support are being provided for experimental programs at other facilities. These programs include the loss-of-coolant accident simulation tests at the NRU reactor, Chalk River, Canada; the fuel rod deformation and post-accident coolability tests for the ESSOR Test Reactor Program, lspra, Italy; the blowdown and reflood tests in the test facility at Cadarache, France; the instrumented fuel assembly irradiation program at Halden, Norway; and the experimental programs at the Power Burst Facility, Idaho National Engineering Laboratory. These programs will provide data for computer modeling of reactor system and fuel performance during various abnormal operating conditions.

  18. Moon base reactor system

    NASA Technical Reports Server (NTRS)

    Chavez, H.; Flores, J.; Nguyen, M.; Carsen, K.

    1989-01-01

    The objective of our reactor design is to supply a lunar-based research facility with 20 MW(e). The fundamental layout of this lunar-based system includes the reactor, power conversion devices, and a radiator. The additional aim of this reactor is a longevity of 12 to 15 years. The reactor is a liquid metal fast breeder that has a breeding ratio very close to 1.0. The geometry of the core is cylindrical. The metallic fuel rods are of beryllium oxide enriched with varying degrees of uranium, with a beryllium core reflector. The liquid metal coolant chosen was natural lithium. After the liquid metal coolant leaves the reactor, it goes directly into the power conversion devices. The power conversion devices are Stirling engines. The heated coolant acts as a hot reservoir to the device. It then enters the radiator to be cooled and reenters the Stirling engine acting as a cold reservoir. The engines' operating fluid is helium, a highly conductive gas. These Stirling engines are hermetically sealed. Although natural lithium produces a lower breeding ratio, it does have a larger temperature range than sodium. It is also corrosive to steel. This is why the container material must be carefully chosen. One option is to use an expensive alloy of cerbium and zirconium. The radiator must be made of a highly conductive material whose melting point temperature is not exceeded in the reactor and whose structural strength can withstand meteor showers.

  19. Moon base reactor system

    NASA Technical Reports Server (NTRS)

    Chavez, H.; Flores, J.; Nguyen, M.; Carsen, K.

    1989-01-01

    The objective of our reactor design is to supply a lunar-based research facility with 20 MW(e). The fundamental layout of this lunar-based system includes the reactor, power conversion devices, and a radiator. The additional aim of this reactor is a longevity of 12 to 15 years. The reactor is a liquid metal fast breeder that has a breeding ratio very close to 1.0. The geometry of the core is cylindrical. The metallic fuel rods are of beryllium oxide enriched with varying degrees of uranium, with a beryllium core reflector. The liquid metal coolant chosen was natural lithium. After the liquid metal coolant leaves the reactor, it goes directly into the power conversion devices. The power conversion devices are Stirling engines. The heated coolant acts as a hot reservoir to the device. It then enters the radiator to be cooled and reenters the Stirling engine acting as a cold reservoir. The engines' operating fluid is helium, a highly conductive gas. These Stirling engines are hermetically sealed. Although natural lithium produces a lower breeding ratio, it does have a larger temperature range than sodium. It is also corrosive to steel. This is why the container material must be carefully chosen. One option is to use an expensive alloy of cerbium and zirconium. The radiator must be made of a highly conductive material whose melting point temperature is not exceeded in the reactor and whose structural strength can withstand meteor showers.

  20. Reactor Safety Planning for Prometheus Project, for Naval Reactors Information

    SciTech Connect

    P. Delmolino

    2005-05-06

    The purpose of this letter is to submit to Naval Reactors the initial plan for the Prometheus project Reactor Safety work. The Prometheus project is currently developing plans for cold physics experiments and reactor prototype tests. These tests and facilities may require safety analysis and siting support. In addition to the ground facilities, the flight reactor units will require unique analyses to evaluate the risk to the public from normal operations and credible accident conditions. This letter outlines major safety documents that will be submitted with estimated deliverable dates. Included in this planning is the reactor servicing documentation and shipping analysis that will be submitted to Naval Reactors.