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Sample records for actinium a

  1. Production of high-purity radium-223 from legacy actinium-beryllium neutron sources.

    Science.gov (United States)

    Soderquist, Chuck Z; McNamara, Bruce K; Fisher, Darrell R

    2012-07-01

    Radium-223 is a short-lived alpha-particle-emitting radionuclide with potential applications in cancer treatment. Research to develop new radiopharmaceuticals employing (223)Ra has been hindered by poor availability due to the small quantities of parent actinium-227 available world-wide. The purpose of this study was to develop innovative and cost-effective methods to obtain high-purity (223)Ra from (227)Ac. We obtained (227)Ac from two surplus actinium-beryllium neutron generators. We retrieved the actinium/beryllium buttons from the sources and dissolved them in a sulfuric-nitric acid solution. A crude actinium solid was recovered from the solution by coprecipitation with thorium fluoride, leaving beryllium in solution. The crude actinium was purified to provide about 40 milligrams of actinium nitrate using anion exchange in methanol-water-nitric acid solution. The purified actinium was then used to generate high-purity (223)Ra. We extracted (223)Ra using anion exchange in a methanol-water-nitric acid solution. After the radium was separated, actinium and thorium were then eluted from the column and dried for interim storage. This single-pass separation produces high purity, carrier-free (223)Ra product, and does not disturb the (227)Ac/(227)Th equilibrium. A high purity, carrier-free (227)Th was also obtained from the actinium using a similar anion exchange in nitric acid. These methods enable efficient production of (223)Ra for research and new alpha-emitter radiopharmaceutical development.

  2. Discovery of the actinium, thorium, protactinium, and uranium isotopes

    CERN Document Server

    Fry, C

    2012-01-01

    Currently, 31 actinium, 31 thorium, 28 protactinium, and 23 uranium isotopes have so far been observed; the discovery of these isotopes is discussed. For each isotope a brief summary of the first refereed publication, including the production and identification method, is presented.

  3. Spectroscopic and computational investigation of actinium coordination chemistry

    Science.gov (United States)

    Ferrier, Maryline G.; Batista, Enrique R.; Berg, John M.; Birnbaum, Eva R.; Cross, Justin N.; Engle, Jonathan W.; La Pierre, Henry S.; Kozimor, Stosh A.; Lezama Pacheco, Juan S.; Stein, Benjamin W.; Stieber, S. Chantal E.; Wilson, Justin J.

    2016-08-01

    Actinium-225 is a promising isotope for targeted-α therapy. Unfortunately, progress in developing chelators for medicinal applications has been hindered by a limited understanding of actinium chemistry. This knowledge gap is primarily associated with handling actinium, as it is highly radioactive and in short supply. Hence, AcIII reactivity is often inferred from the lanthanides and minor actinides (that is, Am, Cm), with limited success. Here we overcome these challenges and characterize actinium in HCl solutions using X-ray absorption spectroscopy and molecular dynamics density functional theory. The Ac-Cl and Ac-OH2O distances are measured to be 2.95(3) and 2.59(3) Å, respectively. The X-ray absorption spectroscopy comparisons between AcIII and AmIII in HCl solutions indicate AcIII coordinates more inner-sphere Cl1- ligands (3.2+/-1.1) than AmIII (0.8+/-0.3). These results imply diverse reactivity for the +3 actinides and highlight the unexpected and unique AcIII chemical behaviour.

  4. Spectroscopic and computational investigation of actinium coordination chemistry

    Science.gov (United States)

    Ferrier, Maryline G.; Batista, Enrique R.; Berg, John M.; Birnbaum, Eva R.; Cross, Justin N.; Engle, Jonathan W.; La Pierre, Henry S.; Kozimor, Stosh A.; Lezama Pacheco, Juan S.; Stein, Benjamin W.; Stieber, S. Chantal E.; Wilson, Justin J.

    2016-01-01

    Actinium-225 is a promising isotope for targeted-α therapy. Unfortunately, progress in developing chelators for medicinal applications has been hindered by a limited understanding of actinium chemistry. This knowledge gap is primarily associated with handling actinium, as it is highly radioactive and in short supply. Hence, AcIII reactivity is often inferred from the lanthanides and minor actinides (that is, Am, Cm), with limited success. Here we overcome these challenges and characterize actinium in HCl solutions using X-ray absorption spectroscopy and molecular dynamics density functional theory. The Ac–Cl and Ac–OH2O distances are measured to be 2.95(3) and 2.59(3) Å, respectively. The X-ray absorption spectroscopy comparisons between AcIII and AmIII in HCl solutions indicate AcIII coordinates more inner-sphere Cl1– ligands (3.2±1.1) than AmIII (0.8±0.3). These results imply diverse reactivity for the +3 actinides and highlight the unexpected and unique AcIII chemical behaviour. PMID:27531582

  5. The release of dissolved actinium to the ocean: A global comparison of different end-members

    Science.gov (United States)

    Geibert, W.; Charette, M.; Kim, G.; Moore, W.S.; Street, J.; Young, M.; Paytan, A.

    2008-01-01

    The measurement of short-lived 223Ra often involves a second measurement for supported activities, which represents 227Ac in the sample. Here we exploit this fact, presenting a set of 284 values on the oceanic distribution of 227Ac, which was collected when analyzing water samples for short-lived radium isotopes by the radium delayed coincidence counting system. The present work compiles 227Ac data from coastal regions all over the northern hemisphere, including values from ground water, from estuaries and lagoons, and from marine end-members. Deep-sea samples from a continental slope off Puerto Rico and from an active vent site near Hawaii complete the overview of 227Ac near its potential sources. The average 227Ac activities of nearshore marine end-members range from 0.4??dpm m- 3 at the Gulf of Mexico to 3.0??dpm m- 3 in the coastal waters of the Korean Strait. In analogy to 228Ra, we find the extension of adjacent shelf regions to play a substantial role for 227Ac activities, although less pronounced than for radium, due to its weaker shelf source. Based on previously published values, we calculate an open ocean 227Ac inventory of 1.35 * 1018??dpm 227Acex in the ocean, which corresponds to 37??moles, or 8.4??kg. This implies a flux of 127??dpm m-2 y- 1 from the deep-sea floor. For the shelf regions, we obtain a global inventory of 227Ac of 4.5 * 1015??dpm, which cannot be converted directly into a flux value, as the regional loss term of 227Ac to the open ocean would have to be included. Ac has so far been considered to behave similarly to Ra in the marine environment, with the exception of a strong Ac source in the deep-sea due to 231Paex. Here, we present evidence of geochemical differences between Ac, which is retained in a warm vent system, and Ra, which is readily released [Moore, W.S., Ussler, W. and Paull, C.K., 2008-this issue. Short-lived radium isotopes in the Hawaiian margin: Evidence for large fluid fluxes through the Puna Ridge. Marine Chemistry

  6. Production of Actinium-225 via High Energy Proton Induced Spallation of Thorium-232

    Energy Technology Data Exchange (ETDEWEB)

    Harvey, James T.; Nolen, Jerry; Vandergrift, George; Gomes, Itacil; Kroc, Tom; Horwitz, Phil; McAlister, Dan; Bowers, Del; Sullivan, Vivian; Greene, John

    2011-12-30

    The science of cancer research is currently expanding its use of alpha particle emitting radioisotopes. Coupled with the discovery and proliferation of molecular species that seek out and attach to tumors, new therapy and diagnostics are being developed to enhance the treatment of cancer and other diseases. This latest technology is commonly referred to as Alpha Immunotherapy (AIT). Actinium-225/Bismuth-213 is a parent/daughter alpha-emitting radioisotope pair that is highly sought after because of the potential for treating numerous diseases and its ability to be chemically compatible with many known and widely used carrier molecules (such as monoclonal antibodies and proteins/peptides). Unfortunately, the worldwide supply of actinium-225 is limited to about 1,000mCi annually and most of that is currently spoken for, thus limiting the ability of this radioisotope pair to enter into research and subsequently clinical trials. The route proposed herein utilizes high energy protons to produce actinium-225 via spallation of a thorium-232 target. As part of previous R and D efforts carried out at Argonne National Laboratory recently in support of the proposed US FRIB facility, it was shown that a very effective production mechanism for actinium-225 is spallation of thorium-232 by high energy proton beams. The base-line simulation for the production rate of actinium-225 by this reaction mechanism is 8E12 atoms per second at 200 MeV proton beam energy with 50 g/cm2 thorium target and 100 kW beam power. An irradiation of one actinium-225 half-life (10 days) produces {approx}100 Ci of actinium-225. For a given beam current the reaction cross section increases slightly with energy to about 400 MeV and then decreases slightly for beam energies in the several GeV regime. The object of this effort is to refine the simulations at proton beam energies of 400 MeV and above up to about 8 GeV. Once completed, the simulations will be experimentally verified using 400 MeV and 8 Ge

  7. Purification of radium-226 for the manufacturing of actinium-225 in a cyclotron for alpha-immunotherapy; Radium-Aufreinigung zur Herstellung von Actinium-225 am Zyklotron fuer die Alpha-Immuntherapie

    Energy Technology Data Exchange (ETDEWEB)

    Marx, Sebastian Markus

    2014-09-23

    The thesis describes the development of methods for the purification of Ra-226. The objective was to obtain the radionuclide in the quality that is needed to be used as starting material in the manufacturing process for Ac-225 via proton-irradiated Ra-226. The radionuclide has been gained efficiently out of huge excesses of impurities. The high purity of the obtained radium affords its use as staring material in a pharmaceutical manufacturing process.

  8. Relativistic small-core pseudopotentials for actinium, thorium, and protactinium.

    Science.gov (United States)

    Weigand, Anna; Cao, Xiaoyan; Hangele, Tim; Dolg, Michael

    2014-04-03

    Small-core pseudopotentials for actinium, thorium, and protactinium have been energy-adjusted to multiconfiguration Dirac-Hartree-Fock reference data based on the Dirac-Coulomb-Breit Hamiltonian and the Fermi nucleus model. Corresponding optimized valence basis sets of polarized valence quadruple-ζ quality are presented. Atomic test calculations for the first four ionization potentials show satisfactory results at both the Hartree-Fock and the multireference averaged coupled-pair functional level. Highly correlated Fock-space coupled cluster calculations demonstrate that the new pseudopotentials yield ionization potentials, which are in excellent agreement with corresponding all-electron results and experimental data. The pseudopotentials and basis sets supplement a similar set previously published for uranium.

  9. Application of ion exchange and extraction chromatography to the separation of actinium from proton-irradiated thorium metal for analytical purposes.

    Science.gov (United States)

    Radchenko, V; Engle, J W; Wilson, J J; Maassen, J R; Nortier, F M; Taylor, W A; Birnbaum, E R; Hudston, L A; John, K D; Fassbender, M E

    2015-02-06

    Actinium-225 (t1/2=9.92d) is an α-emitting radionuclide with nuclear properties well-suited for use in targeted alpha therapy (TAT), a powerful treatment method for malignant tumors. Actinium-225 can also be utilized as a generator for (213)Bi (t1/2 45.6 min), which is another valuable candidate for TAT. Actinium-225 can be produced via proton irradiation of thorium metal; however, long-lived (227)Ac (t1/2=21.8a, 99% β(-), 1% α) is co-produced during this process and will impact the quality of the final product. Thus, accurate assays are needed to determine the (225)Ac/(227)Ac ratio, which is dependent on beam energy, irradiation time and target design. Accurate actinium assays, in turn, require efficient separation of actinium isotopes from both the Th matrix and highly radioactive activation by-products, especially radiolanthanides formed from proton-induced fission. In this study, we introduce a novel, selective chromatographic technique for the recovery and purification of actinium isotopes from irradiated Th matrices. A two-step sequence of cation exchange and extraction chromatography was implemented. Radiolanthanides were quantitatively removed from Ac, and no non-Ac radionuclidic impurities were detected in the final Ac fraction. An (225)Ac spike added prior to separation was recovered at ≥ 98%, and Ac decontamination from Th was found to be ≥ 10(6). The purified actinium fraction allowed for highly accurate (227)Ac determination at analytical scales, i.e., at (227)Ac activities of 1-100 kBq (27 nCi to 2.7 μCi). Copyright © 2014 Elsevier B.V. All rights reserved.

  10. Report for General Research September 18 to December 11, 1950 (Actinium Volume)

    Energy Technology Data Exchange (ETDEWEB)

    Haring, M.M.

    1951-01-15

    The purpose of the research work presented in this volume is to develop a process for the separation and purification of actinium-227 produced by neutron bombardment of radium-226 and to develop methods by which uniform films of actinium metal may be deposited on metallic surfaces. The design work on the cave structure and mechanical equipment used in the actinium separation is proceeding on schedule. As the mechanical design phase is nearing completion the emphasis is being directed toward processing equipment. The process as well as the mechanical equipment has been adapted from the research work of F. T. Hagemann and the Remote Control Group at Argonne National Laboratory. Consequently, one of the first objectives is to become familiary with the chemistry of the process and the operation of the mechanical equipment. Cold runs have been made on the T.T.A. benzene extraction using lanthanum and barium in place of actinium and radium. No difficulty with the operation was observed. The formation of precipitates was one of the difficulties encountered with the process as the precipitates carry radium. It has been found that metals such as nickel cause these precipitates to form and should, therefore, be avoided in the construction of equipment. it was also found that a T.T.A. solution exposed to 0.5 curie of polonium over a period of days develops a precipitate. Some new mechanical features hav eshown promise. The use of copper-coated glassware which will hold together even though the glass is cracked has made it possible to replace custom-built heaters with standard heating mantles. A new graphite, silicone grease mixture appears to hold up in stopcocks handling benzene and, as a result, may eliminate the necessary of entering the cave for regreasing. Tests on the preparation of dense concrete have given results which meet the shielding requirements for the cave. A strippable paint and tape combination has been studied and specified to provide for decontamination of

  11. Effects of spin-orbit coupling on actinium under pressure

    Energy Technology Data Exchange (ETDEWEB)

    Rubio-Ponce, A.; Rivera, J. [Departamento de Ciencias Basicas, Universidad Autonoma Metropolitana-Azcapotzalco, Mexico (Mexico); Olguin, D. [Departamento de Fi sica, Centro de Investigacion y de Estudios Avanzados del Instituto Politecnico Nacional, Mexico (Mexico)

    2015-04-15

    Actinium (Ac) is a radioactive metal and the first element of the actinide series. At ambient conditions Ac crystallizes in the fcc lattice, however, up to date its phase diagram is unknown. In the present work, we have studied the structural and electronic properties of Ac under hydrostatic pressure assuming the fcc structure as well as three hypothetical structures, namely the hcp, bcc, and sc, and for pressures up to 100 GPa. From our calculations, we found only one structural transition allowed, from the fcc to hcp, our calculated pressure was 39.85 GPa. The calculations were performed by means of the full potential linearized augmented plane wave (FLAPW) method and the generalized gradient approximation (GGA) for the exchange-correlation energy, where we have included in our study the spin-orbit coupling which is important for heavy elements. The total energy results were fitted to the third order Birch-Murnaghan's equation of state. (copyright 2015 WILEY-VCH Verlag GmbH and Co. KGaA, Weinheim)

  12. Analysis of the gamma spectra of the uranium, actinium, and thorium decay series

    Energy Technology Data Exchange (ETDEWEB)

    Momeni, M.H.

    1981-09-01

    This report describes the identification of radionuclides in the uranium, actinium, and thorium series by analysis of gamma spectra in the energy range of 40 to 1400 keV. Energies and absolute efficiencies for each gamma line were measured by means of a high-resolution germanium detector and compared with those in the literature. A gamma spectroscopy method, which utilizes an on-line computer for deconvolution of spectra, search and identification of each line, and estimation of activity for each radionuclide, was used to analyze soil and uranium tailings, and ore.

  13. Thorium and actinium polyphosphonate compounds as bone-seeking alpha particle-emitting agents.

    Science.gov (United States)

    Henriksen, Gjermund; Bruland, Oyvind S; Larsen, Roy H

    2004-01-01

    The present study explores the use of alpha-particle-emitting, bone-seeking agents as candidates for targeted radiotherapy. Actinium and thorium 1,4,7,10 tetraazacyclododecane N,N',N'',N''' 1,4,7,10-tetra(methylene) phosphonic acid (DOTMP) and thorium-diethylene triamine N,N',N'' penta(methylene) phosphonic acid (DTMP) were prepared and their biodistribution evaluated in conventional Balb/C mice at four hours after injection. All three bone-seeking agents showed a high uptake in bone and a low uptake in soft tissues. Among the soft tissue organs, only kidney had a relatively high uptake. The femur/kidney ratios for 227Th-DTMP, 228-Ac-DOTMP and 227Th-DOTMP were 14.2, 7.6 and 6.0, respectively. A higher liver uptake of 228Ac-DOTMP was seen than for 227Th-DTMP and 227Th-DOTMP. This suggests that some demetallation of the 228Ac-DOTMP complex had occurred. The results indicate that 225Ac-DOTMP, 227Th-DOTMP and 227Th-DTMP have promising properties as potential therapeutic bone-seeking agents.

  14. Developments towards in-gas-jet laser spectroscopy studies of actinium isotopes at LISOL

    Energy Technology Data Exchange (ETDEWEB)

    Raeder, S., E-mail: s.raeder@gsi.de [KU Leuven, Instituut voor Kern- en Stralingsfysica, Celestijnenlaan 200D, B-3001 Leuven (Belgium); Helmholtz-Institut Mainz, 55128 Mainz (Germany); GSI Helmholtzzentrum für Schwerionenforschung GmbH, Planckstraße 1, 64291 Darmstadt (Germany); Bastin, B. [GANIL, CEA/DSM-CNRS/IN2P3, B.P. 55027, 14076 Caen (France); Block, M. [Helmholtz-Institut Mainz, 55128 Mainz (Germany); GSI Helmholtzzentrum für Schwerionenforschung GmbH, Planckstraße 1, 64291 Darmstadt (Germany); Institut für Kernchemie, Johannes Gutenberg Universität, 55128 Mainz (Germany); Creemers, P. [KU Leuven, Instituut voor Kern- en Stralingsfysica, Celestijnenlaan 200D, B-3001 Leuven (Belgium); Delahaye, P. [GANIL, CEA/DSM-CNRS/IN2P3, B.P. 55027, 14076 Caen (France); Ferrer, R. [KU Leuven, Instituut voor Kern- en Stralingsfysica, Celestijnenlaan 200D, B-3001 Leuven (Belgium); Fléchard, X. [LPC Caen, ENSICAEN, Université de Caen, CNRS/IN2P3, Caen (France); Franchoo, S. [Institute de Physique Nucléaire (IPN) d’Orsay, 91406 Orsay, Cedex (France); Ghys, L. [KU Leuven, Instituut voor Kern- en Stralingsfysica, Celestijnenlaan 200D, B-3001 Leuven (Belgium); SCK-CEN, Belgian Nuclear Research Center, Boeretang 200, 2400 Mol (Belgium); Gaffney, L.P.; Granados, C. [KU Leuven, Instituut voor Kern- en Stralingsfysica, Celestijnenlaan 200D, B-3001 Leuven (Belgium); Heinke, R. [Institut für Physik, Johannes Gutenberg Universität, 55128 Mainz (Germany); Hijazi, L. [GANIL, CEA/DSM-CNRS/IN2P3, B.P. 55027, 14076 Caen (France); and others

    2016-06-01

    To study exotic nuclides at the borders of stability with laser ionization and spectroscopy techniques, highest efficiencies in combination with a high spectral resolution are required. These usually opposing requirements are reconciled by applying the in-gas-laser ionization and spectroscopy (IGLIS) technique in the supersonic gas jet produced by a de Laval nozzle installed at the exit of the stopping gas cell. Carrying out laser ionization in the low-temperature and low density supersonic gas jet eliminates pressure broadening, which will significantly improve the spectral resolution. This article presents the required modifications at the Leuven Isotope Separator On-Line (LISOL) facility that are needed for the first on-line studies of in-gas-jet laser spectroscopy. Different geometries for the gas outlet and extraction ion guides have been tested for their performance regarding the acceptance of laser ionized species as well as for their differential pumping capacities. The specifications and performance of the temporarily installed high repetition rate laser system, including a narrow bandwidth injection-locked Ti:sapphire laser, are discussed and first preliminary results on neutron-deficient actinium isotopes are presented indicating the high capability of this novel technique.

  15. Production of actinium-225 for alpha particle mediated radioimmunotherapy.

    Science.gov (United States)

    Boll, Rose A; Malkemus, Dairin; Mirzadeh, Saed

    2005-05-01

    The initial clinical trials for treatment of acute myeloid leukemia have demonstrated the effectiveness of the alpha emitter (213)Bi in killing cancer cells. Bismuth-213 is obtained from a radionuclide generator system from decay of 10-days (225)Ac parent. Recent pre-clinical studies have also shown the potential application of both (213)Bi, and the (225)Ac parent radionuclide in a variety of cancer systems and targeted radiotherapy. This paper describes our five years of experience in production of (225)Ac in partial support of the on-going clinical trials. A four-step chemical process, consisting of both anion and cation exchange chromatography, is utilized for routine separation of carrier-free (225)Ac from a mixture of (228)Th, (229)Th and (232)Th. The separation of Ra and Ac from Th is achieved using the marcoporous anion exchange resin MP1 in 8M HNO(3) media. Two sequential MP1/NO(3) columns provide a separation factor of approximately 10(6) for Ra and Ac from Th. The separation of Ac from Ra is accomplished on a low cross-linking cation exchange resin AG50-X4 using 1.2M HNO(3) as eluant. Two sequential AG50/NO(3) columns provide a separation factor of approximately 10(2) for Ac from Ra. A 60-day processing schedule has been adopted in order to reduce the processing cost and to provide the highest levels of (225)Ac possible. Over an 8-week campaign, a total of approximately 100 mCi of (225)Ac (approximately 80% of the theoretical yield) is shipped in 5-6 batches, with the first batch typically consisting of approximately 50 mCi. After the initial separation and purification of Ac, the Ra pool is re-processed on a bi-weekly schedule or as needed to provide smaller batches of (225)Ac. The averaged radioisotopic purity of the (225)Ac was 99.6 +/- 0.7% with a (225)Ra content of < or =0.6%, and an average (229)Th content of (4(-4)(+5)) x 10(-5)%.

  16. Purification of selenium from thorium, uranium, radium, actinium and potassium impurities for low background measurements

    Energy Technology Data Exchange (ETDEWEB)

    Rakhimov, A.V. [Joint Institute for Nuclear Research (JINR), Dubna (Russian Federation); Uzbek Academy of Sciences, Tashkent (Uzbekistan). Inst. of Nuclear Physics (INP AS RUz); Warot, G. [CEA-CNRS, Modane (France). Laboratoire Souterrain de Modane (LSM); Karaivanov, D.V. [Joint Institute for Nuclear Research (JINR), Dubna (Russian Federation); Institute for Nuclear Research and Nuclear Energy (INRNE), Sofia (Bulgaria); Kochetov, O.I.; Lebedev, N.A.; Filosofov, D.V. [Joint Institute for Nuclear Research (JINR), Dubna (Russian Federation); Mukhamedshina, N.M.; Sadikov, I.I. [Uzbek Academy of Sciences, Tashkent (Uzbekistan). Inst. of Nuclear Physics (INP AS RUz)

    2013-07-01

    A technique of selenium purification from {sup 232}Th, {sup 238}U, {sup 226,228}Ra, {sup 227}Ac and {sup 40}K was developed. This technique is simple to perform and employs a minimum number of highly pure reagents (bidistilled water, nitric acid). Operations carried out during purification (elution, evaporation) practically exclude losses of the target product (chemical yields of Se > 99%). A test purification of 100 g of selenium was carried out using this technique. The efficiency of this technique was confirmed by low background gamma spectrometry of the purified selenium sample. Distribution coefficients of Th, U, Ra and Ac on DOWEX 50W- x 8 cation-exchange resin at different concentrations of selenium and nitric acid were experimentally determinated. Instrumental neutron activation analysis of bidistilled water, deionized water and nitric acid was performed. (orig.)

  17. Radium-228 analysis of natural waters by Cherenkov counting of Actinium-228

    Energy Technology Data Exchange (ETDEWEB)

    Aleissa, Khalid A.; Almasoud, Fahad I.; Islam, Mohammed S. [Atomic Energy Research Institute, King Abdul Aziz City for Science and Technology, P.O. Box 6086, Riyadh 11442 (Saudi Arabia); L' Annunziata, Michael F. [IAEA Expert, Montague Group, P.O. Box 5033, Oceanside, CA 92052-5033 (United States)], E-mail: mlannunziata@cox.net

    2008-12-15

    The activities of {sup 228}Ra in natural waters were determined by the Cherenkov counting of the daughter nuclide {sup 228}Ac. The radium was pre-concentrated on MnO{sub 2} and the radium purified via ion exchange and, after a 2-day period of incubation to allow for secular equilibrium between the parent-daughter {sup 228}Ra({sup 228}Ac), the daughter nuclide {sup 228}Ac was isolated by ion exchange according to the method of Nour et al. [2004. Radium-228 determination of natural waters via concentration on manganese dioxide and separation using Diphonix ion exchange resin. Appl. Radiat. Isot. 61, 1173-1178]. The Cherenkov photons produced by {sup 228}Ac were counted directly without the addition of any scintillation reagents. The optimum Cherenkov counting window, sample volume, and vial type were determined experimentally to achieve optimum Cherenkov photon detection efficiency and lowest background count rates. An optimum detection efficiency of 10.9{+-}0.1% was measured for {sup 228}Ac by Cherenkov counting with a very low Cherenkov photon background of 0.317{+-}0.013 cpm. The addition of sodium salicylate into the sample counting vial at a concentration of 0.1 g/mL yielded a more than 3-fold increase in the Cherenkov detection efficiency of {sup 228}Ac to 38%. Tests of the Cherenkov counting technique were conducted with several water standards of known activity and the results obtained compared closely with a conventional liquid scintillation counting technique. The advantages and disadvantages of Cherenkov counting compared to liquid scintillation counting methods are discussed. Advantages include much lower Cherenkov background count rates and consequently lower minimal detectable activities for {sup 228}Ra and no need for expensive environmentally unfriendly liquid scintillation cocktails. The disadvantages of the Cherenkov counting method include the need to measure {sup 228}Ac Cherenkov photon detection efficiency and optimum Cherenkov counting volume

  18. Radium-228 analysis of natural waters by Cherenkov counting of Actinium-228.

    Science.gov (United States)

    Aleissa, Khalid A; Almasoud, Fahad I; Islam, Mohammed S; L'Annunziata, Michael F

    2008-12-01

    The activities of (228)Ra in natural waters were determined by the Cherenkov counting of the daughter nuclide (228)Ac. The radium was pre-concentrated on MnO(2) and the radium purified via ion exchange and, after a 2-day period of incubation to allow for secular equilibrium between the parent-daughter (228)Ra((228)Ac), the daughter nuclide (228)Ac was isolated by ion exchange according to the method of Nour et al. [2004. Radium-228 determination of natural waters via concentration on manganese dioxide and separation using Diphonix ion exchange resin. Appl. Radiat. Isot. 61, 1173-1178]. The Cherenkov photons produced by (228)Ac were counted directly without the addition of any scintillation reagents. The optimum Cherenkov counting window, sample volume, and vial type were determined experimentally to achieve optimum Cherenkov photon detection efficiency and lowest background count rates. An optimum detection efficiency of 10.9+/-0.1% was measured for (228)Ac by Cherenkov counting with a very low Cherenkov photon background of 0.317+/-0.013cpm. The addition of sodium salicylate into the sample counting vial at a concentration of 0.1g/mL yielded a more than 3-fold increase in the Cherenkov detection efficiency of (228)Ac to 38%. Tests of the Cherenkov counting technique were conducted with several water standards of known activity and the results obtained compared closely with a conventional liquid scintillation counting technique. The advantages and disadvantages of Cherenkov counting compared to liquid scintillation counting methods are discussed. Advantages include much lower Cherenkov background count rates and consequently lower minimal detectable activities for (228)Ra and no need for expensive environmentally unfriendly liquid scintillation cocktails. The disadvantages of the Cherenkov counting method include the need to measure (228)Ac Cherenkov photon detection efficiency and optimum Cherenkov counting volume, which are not at all required when liquid

  19. Production of actinium, thorium and radium isotopes from natural thorium irradiated with protons up to 141 MeV

    Energy Technology Data Exchange (ETDEWEB)

    Ermolaev, S.V.; Zhuikov, B.L.; Kokhanyuk, V.M.; Matushko, V.L. [Russian Academy of Sciences, Moscow (Russian Federation). Inst. of Nuclear Research; Kalmykov, S.N. [Lomonosov Moscow State Univ., Moscow (Russian Federation). Chemistry Dept.; Aliev, R.A. [Lomonosov Moscow State Univ., Moscow (Russian Federation). Skobeltsyn Inst. of Nuclear Physics; Tananaev, I.G.; Myasoedov, B.F. [Russian Academy of Sciences, Moscow (Russian Federation). A.N. Frumkin Inst. of Physical Chemistry and Electrochemistry

    2012-07-01

    Cross sections of {sup 225}Ac, {sup 227}Ac, {sup 227}Th and {sup 228}Th in thorium-232 targets irradiated with protons in the energy range 21-141 MeV have been measured. Based on these data, production yields of {sup 225}Ac and {sup 223}Ra in thick thorium targets have been calculated. It is possible to produce in proton energy range 60-140 MeV about 96 GBq (2.6 Ci) {sup 225}Ac per 10-d irradiation with 100 {mu}A proton beam current and 10-d decay, and much higher amount of {sup 223}Ra. The impurities of {sup 227}Ac and {sup 224}Ra are important and need to be assessed for further medical applications. (orig.)

  20. Renal uptake of bismuth-213 and its contribution to kidney radiation dose following administration of actinium-225-labeled antibody

    Energy Technology Data Exchange (ETDEWEB)

    Schwartz, J; O' Donoghue, J A; Humm, J L [Department of Medical Physics, Memorial Sloan-Kettering Cancer Center, 1275 York Avenue, New York, NY 10065 (United States); Jaggi, J S [Bristol-Myers Squibb, Plainsboro, NJ (United States); Ruan, S; Larson, S M [Nuclear Medicine Service Department of Radiology, Memorial Sloan-Kettering Cancer Center, 1275 York Avenue, New York, NY 10065 (United States); McDevitt, M; Scheinberg, D A, E-mail: schwarj1@mskcc.org [Molecular Pharmacology and Chemistry, Sloan-Kettering Institute, 1275 York Avenue, New York, NY 10065 (United States)

    2011-02-07

    Clinical therapeutic studies using {sup 225}Ac-labeled antibodies have begun. Of major concern is renal toxicity that may result from the three alpha-emitting progeny generated following the decay of {sup 225}Ac. The purpose of this study was to determine the amount of {sup 225}Ac and non-equilibrium progeny in the mouse kidney after the injection of {sup 225}Ac-huM195 antibody and examine the dosimetric consequences. Groups of mice were sacrificed at 24, 96 and 144 h after injection with {sup 225}Ac-huM195 antibody and kidneys excised. One kidney was used for gamma ray spectroscopic measurements by a high-purity germanium (HPGe) detector. The second kidney was used to generate frozen tissue sections which were examined by digital autoradiography (DAR). Two measurements were performed on each kidney specimen: (1) immediately post-resection and (2) after sufficient time for any non-equilibrium excess {sup 213}Bi to decay completely. Comparison of these measurements enabled estimation of the amount of excess {sup 213}Bi reaching the kidney ({gamma}-ray spectroscopy) and its sub-regional distribution (DAR). The average absorbed dose to whole kidney, determined by spectroscopy, was 0.77 (SD 0.21) Gy kBq{sup -1}, of which 0.46 (SD 0.16) Gy kBq{sup -1} (i.e. 60%) was due to non-equilibrium excess {sup 213}Bi. The relative contributions to renal cortex and medulla were determined by DAR. The estimated dose to the cortex from non-equilibrium excess {sup 213}Bi (0.31 (SD 0.11) Gy kBq{sup -1}) represented {approx}46% of the total. For the medulla the dose contribution from excess {sup 213}Bi (0.81 (SD 0.28) Gy kBq{sup -1}) was {approx}80% of the total. Based on these estimates, for human patients we project a kidney-absorbed dose of 0.28 Gy MBq{sup -1} following administration of {sup 225}Ac-huM195 with non-equilibrium excess {sup 213}Bi responsible for approximately 60% of the total. Methods to reduce renal accumulation of radioactive progeny appear to be necessary for the

  1. Study of the origin of elements of the uranium-235 family observed in excess in the vicinity of the experimental nuclear EL4 reactor under dismantling. Lessons got at this day and conclusions; Etude de l'origine des elements de la famille de l'uranium-235 observes en exces dans les environs du reacteur nucleaire experimental EL4 en cours de demantelement. Enseignements retires a ce jour et conclusion

    Energy Technology Data Exchange (ETDEWEB)

    NONE

    2007-07-01

    This study resumes the discovery of an excess of actinium 227 found around by EL4 nuclear reactor actually in dismantling. The search for the origin of this excess revealed a real inquiry of investigation during three years. Because a nuclear reactor existed in this area a particular attention will have concerned this region. The doubt became the line of conduct to find the answer to the human or natural origin of this excess. Finally and against any evidence, it appears that the origin of this phenomenon was natural, consequence of the particular local geology. The detail of the different investigations is given: search of a possible correlation with the composition of elevations constituent of lanes, search (and underlining) of new sites in the surroundings of the Rusquec pond and the Plouenez station, study of the atmospheric deposits under winds of the nuclear power plant and in the east direction, search of a possible relationship with the gaseous effluents of the nuclear power plant in the past, historical study of radioactive effluents releases in the fifty last years by the analysis of the sedimentary deposits in the Saint-Herbiot reservoir, search of a possible correlation between the excess of actinium 227 and the nuclear power plant activity; search of a possible correlation with a human activity without any relationship with the nuclear activities, search of a correlation with the underground waters, search of a correlation with the geological context, collect of information on the possible transfers in direction of the food chain, determination of the radiological composition of the underground waters ( not perturbed by human activity), search of the cause of an excess of actinium 227 in the old channel of liquid effluents release of the nuclear power plant. The results are given and discussed. And contrary to all expectations the origin of the excess of actinium 227 is completely natural. (N.C.)

  2. Isolation of Actinium from Neutron-irradiated Thorium-I

    Institute of Scientific and Technical Information of China (English)

    1994-01-01

    Isolation of Actinium from Neutron-irradiated Thorium-I¥YangWeifan;YuanShuanggui;MuWantong;ZhangXueqian;LiZhongweiandZhaoLili...

  3. Evaluation of total effective dose due to certain environmentally placed naturally occurring radioactive materials using a procedural adaptation of RESRAD code.

    Science.gov (United States)

    Beauvais, Z S; Thompson, K H; Kearfott, K J

    2009-07-01

    Due to a recent upward trend in the price of uranium and subsequent increased interest in uranium mining, accurate modeling of baseline dose from environmental sources of radioactivity is of increasing interest. Residual radioactivity model and code (RESRAD) is a program used to model environmental movement and calculate the dose due to the inhalation, ingestion, and exposure to radioactive materials following a placement. This paper presents a novel use of RESRAD for the calculation of dose from non-enhanced, or ancient, naturally occurring radioactive material (NORM). In order to use RESRAD to calculate the total effective dose (TED) due to ancient NORM, a procedural adaptation was developed to negate the effects of time progressive distribution of radioactive materials. A dose due to United States' average concentrations of uranium, actinium, and thorium series radionuclides was then calculated. For adults exposed in a residential setting and assumed to eat significant amounts of food grown in NORM concentrated areas, the annual dose due to national average NORM concentrations was 0.935 mSv y(-1). A set of environmental dose factors were calculated for simple estimation of dose from uranium, thorium, and actinium series radionuclides for various age groups and exposure scenarios as a function of elemental uranium and thorium activity concentrations in groundwater and soil. The values of these factors for uranium were lowest for an adult exposed in an industrial setting: 0.00476 microSv kg Bq(-1) y(-1) for soil and 0.00596 microSv m(3) Bq(-1) y(-1) for water (assuming a 1:1 234U:238U activity ratio in water). The uranium factors were highest for infants exposed in a residential setting and assumed to ingest food grown onsite: 34.8 microSv kg Bq(-1) y(-1) in soil and 13.0 microSv m(3) Bq(-1) y(-1) in water.

  4. Origin of elements of the Uranium-235 family observed in the Ellez river near the EL-4 experimental nuclear reactor in dismantling (Monts d'Arree- Finistere department); Origine des elements de la famille de l'uranium-235 observes dans la riviere Ellez a proximite du reacteur nucleaire experimental EL4 en cours de demantelement (Mont d'Arree - departement du Finistere). Resultats et premiers constats annee 2006

    Energy Technology Data Exchange (ETDEWEB)

    NONE

    2006-07-01

    In a previous study which concerned the catchment basin of the harbour of Brest, the A.C.R.O. put in evidence a marking by artificial radioelements around the power plant of Brennilis which can be imputed without ambiguities to the nuclear installation. It also put in evidence abnormalities concerning the natural radioactivity which justifies this new study. In the area of the Monts d'Arree, actinium 227 ({sup 227}Ac), non born by its ascendents which are {sup 235}U and {sup 231}Pa is observed. This phenomenon is characterized by mass activities superior to these ones of {sup 235}U and able to reach these ones of {sup 238}U. Its presence corresponds with the drainage of the Ellez river since the former channel of radioactive effluents releases from the nuclear power plant EL-4 up to the reservoir Saint-Herblot situated 6 km downstream. The strongest values of radioactivity are registered near the disused power plant, at this place a relationship exists between the level of actinium 227 and this one of the artificial radioactivity as it exists a relationship with the decay products of radon exhaled from the subsoil ({sup 210}Pb). But its presence is not limited to a part of the Ellez river, it is equally observed in terrestrial medium, in places in priori not influenced by the direct liquid effluents of the power plant. This place is situated at more than 4 km and without any connection with the Ellez waters. At this stage of the study, it is not possible to answer with certainty the question of the origin of this phenomenon. A new reorientation is considered indispensable to clarify definitively the origin of this unknown phenomenon in the scientific publications and the environmental monitoring. (N.C.)

  5. Liquid Scintillation Counting of Environmental Radioisotopes: A Review of the Impact of Background Reduction

    Energy Technology Data Exchange (ETDEWEB)

    Douglas, Matthew; Bernacki, Bruce E.; Erchinger, Jennifer L.; Finn, Erin C.; Fuller, Erin S.; Hoppe, Eric W.; Keillor, Martin E.; Morley, Shannon M.; Mullen, Crystal A.; Orrell, John L.; Panisko, Mark E.; Warren, Glen A.; Wright, Michael E.

    2016-03-09

    Liquid scintillation counting (LSC) is a versatile and commonplace method for radiometric measurement of charged particle emitting radionuclides. The LSC method provides utility in a range of environmental science applications including hydrological studies of water transport, anthropogenic releases of radionuclides into the environment, and vertical mixing rates within oceans. Instrumental measurement background is one limiting factor of radiometric measurement sensitivity. As part of the development of a custom low background LSC system located in a shallow underground laboratory at Pacific Northwest National Laboratory, a number of measurement applications of LSC have been considered and are summarized here. The focus is on determining which aspects of such measurements would gain the greatest benefit from the reduction of LSC backgrounds by a factor of 10-100 relative to values reported in the literature. Examples of benefits include lowering the minimum detectable activity, reducing the sample size required, and shortening the elapsed timeline of the processing and analysis sequence. In particular tritium, strontium, and actinium isotopes are examined as these isotopes cover a range of requirements related to the LSC measurement method (e.g., 3H: low energy; Sr: spectral deconvolution; Ac: alpha/beta discrimination).

  6. Monofunctionalization of Calix[4]arene Tetracarboxylic Acid at the Upper Rim with Isothiocyanate Group: First Bifunctional Chelating Agent for Alpha-Emitter Ac-225.

    Science.gov (United States)

    Chen, Xiaoyuan; Ji, Min; Fisher, Darrell R; Wai, Chien M

    1999-09-01

    A procedure is reported for synthesizing a novel, water-soluble bifunctional chelating agent derived from calix[4]arene. This chelate features tetracarboxylic acid groups at the lower rim as an actinium-225 ionophore, and an isothiocyanate functional group at the upper rim for labeling of the N-terminus of monoclonal antibodies through thiourea linkage.

  7. A survey of arsenic, manganese, boron, thorium, and other toxic metals in the groundwater of a West Bengal, India neighbourhood.

    Science.gov (United States)

    Bacquart, Thomas; Bradshaw, Kelly; Frisbie, Seth; Mitchell, Erika; Springston, George; Defelice, Jeffrey; Dustin, Hannah; Sarkar, Bibudhendra

    2012-07-01

    Around 150 million people are at risk from arsenic-contaminated groundwater in India and Bangladesh. Multiple metal analysis in Bangladesh has found other toxic elements above the World Health Organization (WHO) health-based drinking water guidelines which significantly increases the number of people at risk due to drinking groundwater. In this study, drinking water samples from the Bongaon area (North 24 Parganas district, West Bengal, India) were analyzed for multiple metal contamination in order to evaluate groundwater quality on the neighbourhood scale. Each sample was analyzed for arsenic (As), boron (B), barium (Ba), chromium (Cr), manganese (Mn), molybdenum (Mo), nickel (Ni), lead (Pb), and uranium (U). Arsenic was found above the WHO health-based drinking water guideline in 50% of these tubewells. Mn and B were found at significant concentrations in 19% and 6% of these tubewells, respectively. The maps of As, Mn, and B concentrations suggest that approximately 75% of this area has no safe tubewells. The concentrations of As, Mn, B, and many other toxic elements are independent of each other. The concentrations of Pb and U were not found above WHO health-based drinking water guidelines but they were statistically related to each other (p-value = 0.001). An analysis of selected isotopes in the Uranium, Actinium, and Thorium Radioactive Decay Series revealed the presence of thorium (Th) in 31% of these tubewells. This discovery of Th, which does not have a WHO health-based drinking water guideline, is a potential public health challenge. In sum, the widespread presence and independent distribution of other metals besides As must be taken into consideration for drinking water remediation strategies involving well switching or home-scale water treatment.

  8. Alpha-emitting isotopes and chromium in a coastal California aquifer

    Science.gov (United States)

    Densmore, Jill N.; Izbicki, John A.; Murtaugh, Joseph M.; Swarzenski, Peter W.; Bullen, Thomas D.

    2014-01-01

    The unadjusted 72-h gross alpha activities in water from two wells completed in marine and alluvial deposits in a coastal southern California aquifer 40 km north of San Diego were 15 and 25 picoCuries per liter (pCi/L). Although activities were below the Maximum Contaminant Level (MCL) of 15 pCi/L, when adjusted for uranium activity; there is concern that new wells in the area may exceed MCLs, or that future regulations may limit water use from the wells. Coupled well-bore flow and depth-dependent water-quality data collected from the wells in 2011 (with analyses for isotopes within the uranium, actinium, and thorium decay-chains) show gross alpha activity in marine deposits is associated with decay of naturally-occurring 238U and its daughter 234U. Radon activities in marine deposits were as high as 2230 pCi/L. In contrast, gross alpha activities in overlying alluvium within the Piedra de Lumbre watershed, eroded from the nearby San Onofre Hills, were associated with decay of 232Th, including its daughter 224Ra. Radon activities in alluvium from Piedra de Lumbre of 450 pCi/L were lower than in marine deposits. Chromium VI concentrations in marine deposits were less than the California MCL of 10 μg/L (effective July 1, 2014) but δ53Cr compositions were near zero and within reported ranges for anthropogenic chromium. Alluvial deposits from the nearby Las Flores watershed, which drains a larger area having diverse geology, has low alpha activities and chromium as a result of geologic and geochemical conditions and may be more promising for future water-supply development.

  9. Behaviour of uranium series radionuclides in surface water (Crouzille, Limousin). Geochemical implications; Comportement des radionucleides des familles de l'uranium dans les eaux superficielles du site de la Crouzille (Limousin): implications geochimiques

    Energy Technology Data Exchange (ETDEWEB)

    NONE

    2008-06-15

    Understanding natural radionuclides behaviour in surface water is a required step to achieve uranium mine rehabilitation and preserve water quality. The first objective of this thesis is to determine which are the radionuclides sources in a drinking water reservoir. The second objective is to improve the knowledge about the behaviour of uranium series radionuclides, especially actinium. The investigated site is a brook (Sagnes, Limousin, France) which floods a peat bog contaminated by a former uranium mine and which empties into the Crouzille lake. It allows studying radionuclides transport in surface water and radionuclides retention through organic substance or water reservoir. Radionuclides distribution in particulate, colloidal and dissolved phases is determined thanks to ultra-filtrations. Gamma spectrometry allows measuring almost all natural radionuclides with only two counting stages. However, low activities of {sup 235}U series radionuclides impose the use of very low background well-type Ge detectors, such as those of the Underground Laboratory of Modane (France). Firstly, this study shows that no or few radionuclides are released by the Sagnes peat bog, although its radioactivity is important. Secondly, it provides details on the behaviour of uranium series radionuclides in surface water. More specifically, it provides the first indications of actinium solubility in surface water. Actinium's behaviour is very close to uranium's even if it is a little less soluble. (author)

  10. Study of the production of residual evaporation nuclei issued from the spallation reaction of uranium-238 by 1 GeV protons; Etude de la production de noyaux residuels d'evaporation issus de la reaction de spallation de l'uranium-238 par des protons a 1 GeV

    Energy Technology Data Exchange (ETDEWEB)

    Taieb, J

    2000-10-01

    The spallation reaction by high energy protons is one of the envisaged nuclear reactions for production of exotic nuclei. We have measured the production of more than 300 different evaporation residues issued by the spallation reaction of Uranium-238 by 1 GeV protons. We used the reverse kinematics technique in order to produce the relativistic nuclei and therefore to be able to detect those nuclides within a very short time, shorter in most cases than the radioactive disintegration period. The achieved nuclear charge and mass resolution are excellent. They allow a good accuracy on the values of the measured cross-sections (10 to 15%). We have observed for the first time the nuclide Actinium-235 obtained consequently to the loss of 3 protons by the projectile. The measured isotopic distribution are strongly influenced by the mechanism of fission which leads to a strong reduction of the production of the heavy neutron deficient isotopes. We have compared our results to some other measurements achieved with radio-chemical methods at a similar energy. We observed a systematic disagreement of about 40%. Some comparison with the available systematics show that those are presently not able to reproduce the data with a reasonable precision. We could also measure the recoil momentum distribution for each studied isotopes. We show that Goldhaber's model agrees very well with the experiment in case. of 'cold' channels where the evaporation of particles never occurs. On the other hand, when the produced pre-fragment is excited the data show that Goldhaber's model does not reproduce.the data showing the limitation of such an approach. We finally tried to reproduce the measurement of evaporation residue cross-section thanks to the coupling of intra-nuclear cascade and statistical evaporation codes. The influence of the fission process is rather important is the system p+U; we therefore had to account for the dynamical aspect of the fission. We also showed

  11. Analysis of the Yrast Bands with q-Deformed Moment of Inertia

    Institute of Scientific and Technical Information of China (English)

    FANG Xiang-Zheng; RUAN Tu-Nan

    2001-01-01

    The rigid-rotor with a q-deformed moment of inertia is introduced to describe the nuclear rotational spectra. With the representations of quantum algebra, the normal deformed and superdeformed bands are naturally differentiated by softness. The yrast normal deformed bands in rare earth and actinium regions, as well as the yrast superdeformed bands in A-190 and 150 regions are investigated. The calculated results agree with experimental data qualitatively well, and the values of the parameters are physically reasonable. This indicates that the fixed deformation, the stretching effect and the many body statistics effect are three possible dominant factors to govern nuclear rotational bands.

  12. Purification of cerium, neodymium and gadolinium for low background experiments

    Directory of Open Access Journals (Sweden)

    Boiko R.S.

    2014-01-01

    Full Text Available Cerium, neodymium and gadolinium contain double beta active isotopes. The most interesting are 150Nd and 160Gd (promising for 0ν2β search, 136Ce (2β+ candidate with one of the highest Q2β. The main problem of compounds containing lanthanide elements is their high radioactive contamination by uranium, radium, actinium and thorium. The new generation 2β experiments require development of methods for a deep purification of lanthanides from the radioactive elements. A combination of physical and chemical methods was applied to purify cerium, neodymium and gadolinium. Liquid-liquid extraction technique was used to remove traces of Th and U from neodymium, gadolinium and for purification of cerium from Th, U, Ra and K. Co-precipitation and recrystallization methods were utilized for further reduction of the impurities. The radioactive contamination of the samples before and after the purification was tested by using ultra-low-background HPGe gamma spectrometry. As a result of the purification procedure the radioactive contamination of gadolinium oxide (a similar purification efficiency was reached also with cerium and neodymium oxides was decreased from 0.12 Bq/kg to 0.007 Bq/kg in 228Th, from 0.04 Bq/kg to <0.006 Bq/kg in 226Ra, and from 0.9 Bq/kg to 0.04 Bq/kg in 40K. The purification methods are much less efficient for chemically very similar radioactive elements like actinium, lanthanum and lutetium.

  13. Large scale accelerator production of (225)Ac: Effective cross sections for 78-192MeV protons incident on (232)Th targets.

    Science.gov (United States)

    Griswold, J R; Medvedev, D G; Engle, J W; Copping, R; Fitzsimmons, J M; Radchenko, V; Cooley, J C; Fassbender, M E; Denton, D L; Murphy, K E; Owens, A C; Birnbaum, E R; John, K D; Nortier, F M; Stracener, D W; Heilbronn, L H; Mausner, L F; Mirzadeh, S

    2016-12-01

    Actinium-225 and (213)Bi have been used successfully in targeted alpha therapy (TAT) in preclinical and clinical research. This paper is a continuation of research activities aiming to expand the availability of (225)Ac. The high-energy proton spallation reaction on natural thorium metal targets has been utilized to produce millicurie quantities of (225)Ac. The results of sixteen irradiation experiments of thorium metal at beam energies between 78 and 192MeV are summarized in this work. Irradiations have been conducted at Brookhaven National Laboratory (BNL) and Los Alamos National Laboratory (LANL), while target dissolution and processing was carried out at Oak Ridge National Laboratory (ORNL). Excitation functions for actinium and thorium isotopes, as well as for some of the fission products, are presented. The cross sections for production of (225)Ac range from 3.6 to 16.7mb in the incident proton energy range of 78-192MeV. Based on these data, production of curie quantities of (225)Ac is possible by irradiating a 5.0gcm(-2 232)Th target for 10 days in either BNL or LANL proton irradiation facilities. Copyright © 2016 Elsevier Ltd. All rights reserved.

  14. Process for radioisotope recovery and system for implementing same

    Science.gov (United States)

    Meikrantz, David H.; Todd, Terry A.; Tranter, Troy J.; Horwitz, E. Philip

    2007-01-02

    A method of recovering daughter isotopes from a radioisotope mixture. The method comprises providing a radioisotope mixture solution comprising at least one parent isotope. The at least one parent isotope is extracted into an organic phase, which comprises an extractant and a solvent. The organic phase is substantially continuously contacted with an aqueous phase to extract at least one daughter isotope into the aqueous phase. The aqueous phase is separated from the organic phase, such as by using an annular centrifugal contactor. The at least one daughter isotope is purified from the aqueous phase, such as by ion exchange chromatography or extraction chromatography. The at least one daughter isotope may include actinium-225, radium-225, bismuth-213, or mixtures thereof. A liquid-liquid extraction system for recovering at least one daughter isotope from a source material is also disclosed.

  15. Towards high-resolution laser ionization spectroscopy of the heaviest elements in supersonic gas jet expansion

    Science.gov (United States)

    Ferrer, R.; Barzakh, A.; Bastin, B.; Beerwerth, R.; Block, M.; Creemers, P.; Grawe, H.; de Groote, R.; Delahaye, P.; Fléchard, X.; Franchoo, S.; Fritzsche, S.; Gaffney, L. P.; Ghys, L.; Gins, W.; Granados, C.; Heinke, R.; Hijazi, L.; Huyse, M.; Kron, T.; Kudryavtsev, Yu.; Laatiaoui, M.; Lecesne, N.; Loiselet, M.; Lutton, F.; Moore, I. D.; Martínez, Y.; Mogilevskiy, E.; Naubereit, P.; Piot, J.; Raeder, S.; Rothe, S.; Savajols, H.; Sels, S.; Sonnenschein, V.; Thomas, J-C; Traykov, E.; Van Beveren, C.; Van den Bergh, P.; Van Duppen, P.; Wendt, K.; Zadvornaya, A.

    2017-01-01

    Resonant laser ionization and spectroscopy are widely used techniques at radioactive ion beam facilities to produce pure beams of exotic nuclei and measure the shape, size, spin and electromagnetic multipole moments of these nuclei. However, in such measurements it is difficult to combine a high efficiency with a high spectral resolution. Here we demonstrate the on-line application of atomic laser ionization spectroscopy in a supersonic gas jet, a technique suited for high-precision studies of the ground- and isomeric-state properties of nuclei located at the extremes of stability. The technique is characterized in a measurement on actinium isotopes around the N=126 neutron shell closure. A significant improvement in the spectral resolution by more than one order of magnitude is achieved in these experiments without loss in efficiency. PMID:28224987

  16. Temporal Variations in Surface Concentrations of Terrestrial Lead 210 and Uranium 235 Radionucleides

    Science.gov (United States)

    Yoshimori, M.

    We have started to measure the surface concentrations of terrestrial radionucleides of lead 210 and uranium 235 in Tokyo (N35, E139) in 2002. Lead 210 which is a daughter nucleus of Rn-222 (uranium series) emits 46 keV gamma-ray with a half-life of 22.4 years, while uranium 235 (actinium series) emits a gamma-ray at 186 keV with a half-life of 0.7 billion years. The present measurement of the surface concentration of lead 210 exhibits two peaks in spring and fall, similar to the beryllium 7 seasonal variations, while the uranium 235 concentration does not vary with time within statistical errors. These two terrestrial radionucleides exhibit different temporal variations on the surface. We discuss possible explanations for the differences in the temporal variations from a point of view of differences in their altitude distribution.

  17. 两种稀土产品中放射性核素分析研究%ANALYSIS OF RADIONUCLIDES IN TWO RARE EARTH PRODUCTS

    Institute of Scientific and Technical Information of China (English)

    周程; 孙恋君

    2009-01-01

    利用高纯锗γ谱仪对两个稀土产品氯化镧和氯化钇的样品进行能谱分析,研究经湿法冶炼工艺后的稀土产品中放射性核素的活度变化.结果表明,样品中存在天然放射性钍系和锕-铀系的核素,以及天然放射性核素~(138)La和~(176)Lu,但两个样品中所含的放射性核素不相同.氯化镧产品中锕-铀系和钍系核素放射性未达平衡,其主要子体~(224)Ra和~(227)Th的含量随时间发生明显变化,约60天达到平衡;而氯化钇产品没有这种现象.%This paper describes a study on raidoactivity change of rare-earth products after hydrometallurgy technology,using HPGe gamma spectrometer to analyze two rare earth products (LaCl_3 and YCl_3).The results show that in the two samples exist natural radionuclides of thorium series and actinium-uranium series as well as other natural radionuclides 138 La and 176 Lu.In the sample of lanthanum chloride the radioactivity of actinium-uranium series and thorium series has not reached balance,the contents of their main progenies ~(226)Ra and ~(227)Th obviously changes with the time,reaching balance 60 days later,while YCl_3 keeps stability.

  18. TRASH TO TREASURE: CONVERTING COLD WAR LEGACY WASTE INTO WEAPONS AGAINST CANCER

    Energy Technology Data Exchange (ETDEWEB)

    Nicholas, R.G.; Lacy, N.H.; Butz, T.R.; Brandon, N.E.

    2004-10-06

    As part of its commitment to clean up Cold War legacy sites, the U.S. Department of Energy (DOE) has initiated an exciting and unique project to dispose of its inventory of uranium-233 (233U) stored at Oak Ridge National Laboratory (ORNL), and extract isotopes that show great promise in the treatment of deadly cancers. In addition to increasing the supply of potentially useful medical isotopes, the project will rid DOE of a nuclear concern and cut surveillance and security costs. For more than 30 years, DOE's ORNL has stored over 1,200 containers of fissile 233U, originally produced for several defense-related projects, including a pilot study that looked at using 233U as a commercial reactor fuel. This uranium, designated as special nuclear material, requires expensive security, safety, and environmental controls. It has been stored at an ORNL facility, Building 3019A, that dates back to the Manhattan Project. Down-blending the material to a safer form, rather than continuing to store it, will eliminate a $15 million a year financial liability for the DOE and increase the supply of medical isotopes by 5,700 percent. During the down-blending process, thorium-229 (229Th) will be extracted. The thorium will then be used to extract actinium-225 (225Ac), which will ultimately supply its progeny, bismuth-213 (213Bi), for on-going cancer research. The research includes Phase II clinical trials for the treatment of acute myelogenous leukemia at Sloan-Kettering Memorial Cancer Center in New York, as well as other serious cancers of the lungs, pancreas, and kidneys using a technique known as alpha-particle radioimmunotherapy. Alpha-particle radioimmunotherapy is based on the emission of alpha particles by radionuclides. 213Bi is attached to a monoclonal antibody that targets specific cells. The bismuth then delivers a high-powered but short-range radiation dose, effectively killing the cancerous cells but sparing the surrounding tissue. Production of the actinium and

  19. Soil and river sediments radionuclides monitoring at Aramar Experimental Center: an historical overview

    Energy Technology Data Exchange (ETDEWEB)

    Segre, Nadia; Fagundes, Rosane Correa, E-mail: nadia.segre@ctmsp.mar.mil.br [Centro Tecnologico da Marinha (CTM-SP/CEA/LARE), Ipero, SP (Brazil). Centro Experimental Aramar. Lab. Radioecologico; Moraes, Marco Antonio P.V. [Instituto de Pesquisas Energeticas e Nucleares (IPEN/CNEN-SP), Sao Paulo, SP (Brazil)

    2013-07-01

    In order to evaluate possible effects to the environment resulting from the implementation of the Centro Tecnologico da Marinha - Centro Experimental Aramar (CTMSP-CEA) at Ipero in Sao Paulo state, Brazil, which came into operation in 1989, an Environmental Monitoring Program (PMA) was established in October, 1987. One of the aims of this program is to monitor the soil and river sediments radionuclides levels at CEA and beyond its boundary. The utilization of statistical tools to evaluate the results of radiometric environmental monitoring is a procedure required by National Nuclear Energy Commission (CNEN). The box plot is a simple statistical tool for displaying data. The central tendency and dispersion of the results as well as the observation of unusual results (outliers) in the dataset are easily visualized. Control chart is a graph that maps data and provides a picture of how a process is performing over time. A control chart always has a central line for the mean, an upper line for the upper control limit and a lower line for the lower control limit. Box plots and control charts were used to visualize the annual amount of natural uranium, lead-214, actinium-228 and lead-212 in soil and river sediment detected between 1987 and 2011, considering the measurements of all monitored places each year. This historical observation shows that, in average, the results obtained are below than the 1987-1988 levels (CEA's pre-operational) or below than the backgrounds radionuclides values. (author)

  20. Radium-228 determination of natural waters via concentration on manganese dioxide and separation using Diphonix ion exchange resin.

    Science.gov (United States)

    Nour, S; El-Sharkawy, A; Burnett, W C; Horwitz, E P

    2004-12-01

    The objective of this work was to establish a new procedure for 228Ra determination of natural waters via preconcentration of radium on MnO2 and separation of its daughter, 228Ac, using Diphonix ion exchange resin. Following removal of potential interferences via passage through an initial Diphonix Resin column, the first daughter of 228Ra, 228Ac, is isolated by chromatographic separation via a second Diphonix column. A holding time of > 30 h for 228Ac ingrowth in between the two column separations ensures secular equilibrium. Barium-133 is used as a yield tracer. Actinium-228 is eluted from the second Diphonix Resin with 5 ml 1M 1-Hydroxyethane-1,1-diphosphonic acid (HEDPA) and quantified by addition of scintillation cocktail and LSC counting. Radium (and 133Ba) from the load and rinse solutions from the 2nd Diphonix column may be prepared for alpha spectrometry (for determination of 223Ra, 224Ra, and 226Ra) by BaSO4 microprecipitation and filtration. Decontamination tests indicate that U, Th, and Ra series nuclides do not interfere with these measurements, although high contents of 90Sr (90Y) require additional treatment for accurate measurement of 228Ra. Addition of stable Sr as a "hold back" carrier during the initial MnO2 preconcentration step was shown to remove most 90Sr interference.

  1. Cyclotron production of cesium radionuclides as analogues for francium-221 biodistribution

    Science.gov (United States)

    Finn, R.; McDevitt, M.; Sheh, Y.; Lom, C.; Qiao, J.; Cai, S.; Burnazi, E.; Nacca, A.; Pillarsetty, N.; Jaggi, J.; Scheinberg, D.

    2005-12-01

    In our clinical investigations focussing on improved therapeutic treatment of specific tumors we have concentrated on a targeted therapy approach utilizing designed radiolabeled monoclonal antibodies as the cytotoxic reagent. The physical characteristics of the alpha particle emitting radionuclide bismuth-213 including the short half-life of 45.6 min, has shown promise for the treatment of specific cancers such as leukemias and lymphomas or micrometastatic carcinomas. In an effort to increase the cytocidal effect of the HuM195, a humanized monoclonal antibody carrier to the CD33 antigen expressed on leukemia cells, our focus is directed toward an "internal" nano-generator composed of Ac-225 radionuclide, the parent of the bismuth-213. The actinium-225 radionuclide decays through several short-lived, alpha emitting daughters including francium-221, astatine-217 and bismuth-213. In order to study the biodistribution and the pharmacokinetics of the individual daughter nuclide, francium-221, the cyclotron production and separation of cesium radionuclides, specifically cesium-132, from a natural xenon gas target was undertaken. The choice of cesium as an analogue for francium was predicated upon both elements being in Group 1A alkali metals and cesium radionuclide possesses a sufficient half-life to allow biodistribution studies to be performed. The preliminary experimental results of this investigation are presented.

  2. An Ion Exchange Study of Possible Hydridized 5f Bonding in theActinides

    Energy Technology Data Exchange (ETDEWEB)

    Diamond, R.M.; Street, Jr., K.; Seaborg, G.T.

    1951-08-28

    A study has been made of the elution behavior of curium(III), americium(III), plutonium(III), actinium(III), plutonium(IV), neptunium(IV), uraniuM(IV), thorium(IV), neptunium(V), plutonium (VI), uranium (VI), lanthanum(III), cerium(III), europium(III), ytterbium(III), ytterium(III), strontium(II), barium(II), radium(II), cesium(I) with 3.2 M, 6.2 M, 9.3 M, and 12.2 M HCl solutions from Dowex-50 cation exchange resin columns. These elutions show that in high concentrations of hydrochloric acid the actinides form complex ions with chloride ion to a much greater extent than the lanthanides. The strengths of the tripositive actinide complex ions apparently go in the order plutonium > americium> curium, although their ionic radii also decrease in this same order. To explain these results, a partial covalent character may be ascribed to the bonding in the transuranium complex ions. It is shown that a reasonable structure for such covalent bonding involves hybridization of the 5f orbitals in the actinide elements.

  3. Rutherford's curriculum vitae, 1894-1907.

    Science.gov (United States)

    Cohen, M

    1995-06-01

    A single page, handwritten document was discovered when the Macdonald Physics building of McGill University in Montreal was gutted in 1978. This proved to be the draft of Ernest Rutherford's curriculum vitae (C.V.) covering the years 1894-1907, probably written in the autumn of 1906 when Rutherford was preparing to leave McGill. The C.V. contains 21 headings in chronological order, referring to research and other activities of Rutherford and his coauthors (especially Soddy and Barnes), plus a further set of headings relating to the associated investigations of Rutherford's team, including Eve and Hahn. A transcript of the document is provided, although in several places, Rutherford's handwriting is difficult to interpret, and the significance of his abbreviations is not always clear. Each of the items in the C.V. is discussed briefly in this review, in the light both of Rutherford's personal career and of the contribution of his team to the development and understanding of radioactivity. This contribution included the cause and nature of radioactivity (with Soddy), energy aspects of radioactive decay (with Barnes), elucidation of the uranium-radium, thorium and actinium series (Godlewski and Hahn), the radioactivity of the earth and atmosphere (Eve), the nature of the gamma rays (Eve) and, perhaps most important of all, the nature and properties of the alpha particle (Rutherford himself). The latter investigations led directly to Rutherford's later work in Manchester, including the nuclear model of the atom and artificial disintegration of the nucleus.

  4. Coupling of Uranium and Thorium Series Isotope Systematics for Age Determination of Late Pleistocene Zircons using LA-ICP-MS

    Science.gov (United States)

    Sakata, S.; Hirakawa, S.; Iwano, H.; Danhara, T.; Hirata, T.

    2014-12-01

    Zircon U-Th-Pb dating method is one of the most important tools for estimating the duration of magmatism by means of coupling of uranium, actinium and thorium decay series. Using U-Pb dating method, its reliability is principally guaranteed by the concordance between 238U-206Pb and 235U-207Pb ages. In case of dating Quaternary zircons, however, the initial disequilibrium effect on 230Th and 231Pa should be considered. On the other hands, 232Th-208Pb dating method can be a simple but powerful approach for investigating the age of crystallization because of negligible influence from initial disequilibrium effect. We have developed a new correction model for accurate U-Pb dating of the young zircon samples by taking into consideration of initial disequilibrium and a U-Pb vs Th-Pb concordia diagram for reliable age calibration was successfully established. Hence, the U-Th-Pb dating method can be applied to various zircons ranging from Hadean (4,600 Ma) to Quaternary (~50 ka) ages, and this suggests that further detailed information concerning the thermal history of the geological sequences can be made by the coupling of U-Th-Pb, fission track and Ar-Ar ages. In this presentation, we will show an example of U-Th-Pb dating for zircon samples from Sambe Volcano (3 to 100 ka), southwest Japan and the present dating technique using LA-ICP-MS.

  5. Pulse-shape discrimination and energy quenching of alpha particles in Cs$_2$LiLaBr$_6$:Ce$^{3+}$

    CERN Document Server

    Mesick, Katherine E; Stonehill, Laura C

    2016-01-01

    Cs$_2$LiLaBr$_6$:Ce$^{3+}$ (CLLB) is an elpasolite scintillator that offers excellent linearity and gamma-ray energy resolution and sensitivity to thermal neutrons with the ability to perform pulse-shape discrimination (PSD) to distinguish gammas and neutrons. Our investigation of CLLB has indicated the presence of intrinsic radioactive alpha background that we have determined to be from actinium contamination of the lanthanum component. We measured the pulse shapes for gamma, thermal neutron, and alpha events and determined that PSD can be performed to separate the alpha background with a moderate figure of merit of 0.98. We also measured the electron-equivalent-energy of the alpha particles in CLLB and simulated the intrinsic alpha background from $^{227}$Ac to determine the quenching factor of the alphas. A linear quenching relationship $L_{\\alpha} = E_{\\alpha} \\times q + L_0$ was found at alpha particle energies above 5 MeV, with a quenching factor $q = 0.71$ MeVee/MeV and an offset $L_0 = - 1.19$ MeVee.

  6. Tumor Immunotargeting Using Innovative Radionuclides

    Directory of Open Access Journals (Sweden)

    Françoise Kraeber-Bodéré

    2015-02-01

    Full Text Available This paper reviews some aspects and recent developments in the use of antibodies to target radionuclides for tumor imaging and therapy. While radiolabeled antibodies have been considered for many years in this context, only a few have reached the level of routine clinical use. However, alternative radionuclides, with more appropriate physical properties, such as lutetium-177 or copper-67, as well as alpha-emitting radionuclides, including astatine-211, bismuth-213, actinium-225, and others are currently reviving hopes in cancer treatments, both in hematological diseases and solid tumors. At the same time, PET imaging, with short-lived radionuclides, such as gallium-68, fluorine-18 or copper-64, or long half-life ones, particularly iodine-124 and zirconium-89 now offers new perspectives in immuno-specific phenotype tumor imaging. New antibody analogues and pretargeting strategies have also considerably improved the performances of tumor immunotargeting and completely renewed the interest in these approaches for imaging and therapy by providing theranostics, companion diagnostics and news tools to make personalized medicine a reality.

  7. Development of an Ultra-Low Background Liquid Scintillation Counter for Trace Level Analysis

    Energy Technology Data Exchange (ETDEWEB)

    Erchinger, Jennifer L.; Orrell, John L.; Aalseth, Craig E.; Bernacki, Bruce E.; Douglas, Matthew; Finn, Erin C.; Fuller, Erin S.; Keillor, Martin E.; Morley, Shannon M.; Mullen, Crystal A.; Panisko, Mark E.; Shaff, Sarah M.; Warren, Glen A.; Wright, Michael E.

    2015-09-01

    Low-level liquid scintillation counting (LSC) has been established as one of the radiation detection techniques useful in elucidating environmental processes and environmental monitoring around nuclear facilities. The Ultra-Low Background Liquid Scintillation Counter (ULB-LSC) under construction in the Shallow Underground Laboratory at Pacific Northwest National Laboratory aims to further reduce the MDAs and/or required sample processing. Through layers of passive shielding in conjunction with an active veto and 30 meters water equivalent overburden, the background reduction is expected to be 10 to 100 times below typical analytic low-background liquid scintillation systems. Simulations have shown an expected background of around 14 counts per day. A novel approach to the light collection will use a coated hollow light guide cut into the inner copper shielding. Demonstration LSC measurements will show low-energy detection, spectral deconvolution, and alpha/beta discrimination capabilities, from trials with standards of tritium, strontium-90, and actinium-227, respectively. An overview of the system design and expected demonstration measurements will emphasize the potential applications of the ULB-LSC in environmental monitoring for treaty verification, reach-back sample analysis, and facility inspections.

  8. 10 CFR Appendix E to Part 20 - Nationally Tracked Source Thresholds

    Science.gov (United States)

    2010-01-01

    ... Category 1(TBq) Category 1(Ci) Category 2(TBq) Category 2(Ci) Actinium-227 20 540 0.2 5.4 Americium-241 60... 2 54 Strontium-90 1,000 27,000 10 270 Thorium-228 20 540 0.2 5.4 Thorium-229 20 540 0.2 5.4...

  9. I. The metabolic properties of plutonium and allied materials

    Energy Technology Data Exchange (ETDEWEB)

    Hamilton, J.G.

    1948-05-24

    This report on the metabolic properties of plutonium and related radioactive materials presents experimental information in the following areas: radioautographic studies; tracer studies (with tables of accumulation in tissues) of actinium, radio-zirconium, technetium, radio-rubidium, radio-germanium, beryllium, and cadmium; decontamination and bone metabolism studies; and radio-chemical isolation.

  10. An aerial radiological survey of the Nevada Test Site

    Energy Technology Data Exchange (ETDEWEB)

    Hendricks, T J; Riedhauser, S R

    1999-12-01

    A team from the Remote Sensing Laboratory conducted an aerial radiological survey of the US Department of Energy's Nevada Test Site including three neighboring areas during August and September 1994. The survey team measured the terrestrial gamma radiation at the Nevada Test Site to determine the levels of natural and man-made radiation. This survey included the areas covered by previous surveys conducted from 1962 through 1993. The results of the aerial survey showed a terrestrial background exposure rate that varied from less than 6 microroentgens per hour (mR/h) to 50 mR/h plus a cosmic-ray contribution that varied from 4.5 mR/h at an elevation of 900 meters (3,000 feet) to 8.5 mR/h at 2,400 meters (8,000 feet). In addition to the principal gamma-emitting, naturally occurring isotopes (potassium-40, thallium-208, bismuth-214, and actinium-228), the man-made radioactive isotopes found in this survey were cobalt-60, cesium-137, europium-152, protactinium-234m an indicator of depleted uranium, and americium-241, which are due to human actions in the survey area. Individual, site-wide plots of gross terrestrial exposure rate, man-made exposure rate, and americium-241 activity (approximating the distribution of all transuranic material) are presented. In addition, expanded plots of individual areas exhibiting these man-made contaminations are given. A comparison is made between the data from this survey and previous aerial radiological surveys of the Nevada Test Site. Some previous ground-based measurements are discussed and related to the aerial data. In regions away from man-made activity, the exposure rates inferred from the gamma-ray measurements collected during this survey agreed very well with the exposure rates inferred from previous aerial surveys.

  11. Selective alpha-particle mediated depletion of tumor vasculature with vascular normalization.

    Directory of Open Access Journals (Sweden)

    Jaspreet Singh Jaggi

    Full Text Available BACKGROUND: Abnormal regulation of angiogenesis in tumors results in the formation of vessels that are necessary for tumor growth, but compromised in structure and function. Abnormal tumor vasculature impairs oxygen and drug delivery and results in radiotherapy and chemotherapy resistance, respectively. Alpha particles are extraordinarily potent, short-ranged radiations with geometry uniquely suitable for selectively killing neovasculature. METHODOLOGY AND PRINCIPAL FINDINGS: Actinium-225 ((225Ac-E4G10, an alpha-emitting antibody construct reactive with the unengaged form of vascular endothelial cadherin, is capable of potent, selective killing of tumor neovascular endothelium and late endothelial progenitors in bone-marrow and blood. No specific normal-tissue uptake of E4G10 was seen by imaging or post-mortem biodistribution studies in mice. In a mouse-model of prostatic carcinoma, (225Ac-E4G10 treatment resulted in inhibition of tumor growth, lower serum prostate specific antigen level and markedly prolonged survival, which was further enhanced by subsequent administration of paclitaxel. Immunohistochemistry revealed lower vessel density and enhanced tumor cell apoptosis in (225Ac-E4G10 treated tumors. Additionally, the residual tumor vasculature appeared normalized as evident by enhanced pericyte coverage following (225Ac-E4G10 therapy. However, no toxicity was observed in vascularized normal organs following (225Ac-E4G10 therapy. CONCLUSIONS: The data suggest that alpha-particle immunotherapy to neovasculature, alone or in combination with sequential chemotherapy, is an effective approach to cancer therapy.

  12. Evaluation of naturally occurring radioactive materials (NORMs) in inorganic and organic oilfield scales from the Middle East.

    Science.gov (United States)

    Bassioni, Ghada; Abdulla, Fareed; Morsy, Zeinab; El-Faramawy, Nabil

    2012-04-01

    The distribution of natural nuclide gamma-ray activities and their respective annual effective dose rates, produced by potassium-40 (⁴⁰K), uranium-238 (²³⁸U), thorium-232 (²³²Th), and radium-226 (²²⁶Ra), were determined for 14 oilfield scale samples from the Middle East. Accumulated radioactive materials concentrate in tubing and surface equipment, and workers at equipment-cleaning facilities and naturally occurring radioactive materials (NORMs) disposal facilities are the population most at risk for exposure to NORM radiation. Gamma-spectra analysis indicated that photo-gamma lines represent the parents of 10 radioactive nuclides: ²³⁴Th, plutonium-239, actinium-228, ²²⁶Ra, lead-212 (²¹²Pb), ²¹⁴Pb, thallium-238 (²⁰⁸Tl), bismuth-212 (²¹²Bi), ²¹⁴Bi, and ⁴⁰K. These nuclides represent the daughters of the natural radioactive series ²³⁸U and ²³²Th with ⁴⁰K as well. The mean activity concentration of ²³⁸U, ²³²Th, and ⁴⁰K were found to be 25.8 ± 11.6, 18.3 ± 8.1, and 4487.2 ± 2.5% Bq kg⁻¹ (average values for 14 samples), respectively. The annual effective dose rates and the absorbed doses in air, both indoor and outdoor, for the samples were obtained as well. The results can be used to assess the respective hazard on workers in the field and represent a basis for revisiting current engineering practices.

  13. a

    Directory of Open Access Journals (Sweden)

    I. Pérez

    Full Text Available Fundamento: La solicitud de pruebas diagnósticas desde atención primaria presentan un aumento progresivo en el tiempo y una gran variabilidad interpersonal en su solicitud, que sugiere que se están aplicando servicios inefectivos. El objetivo es conocer las características de los demandantes de pruebas radiológicas (radiología general y ecografía y cuantificar las pruebas innecesarias en atención primaria. Material y métodos: Estudio descriptivo transversal sobre una muestra en cluster de 23 centros de salud de Navarra en el mes de marzo de 2004. Se diseña un cuestionario específico para cumplimentar por el médico solicitante de la prueba diagnóstica. Se realiza análisis multivariante mediante regresión logística para estudiar la asociación entre pruebas innecesarias y las otras variables de estudio. Resultados: Se realizan pruebas al 9 por mil de la población estudiada. La variabilidad interprofesional en la solicitud de pruebas oscila entre 0 y 33,3 por cada 1000 tarjetas sanitarias para la edad infantil. Los estudios radiológicos solicitados con mayor frecuencia fueron los óseos (48,9%, LC: 42,4-55,5. En el 63,2% de las solicitudes no se realizaron modificaciones en el tratamiento previo a la solicitud de la prueba y el 57 % (LC: 52,4-61,7 de las pruebas realizadas se solicitan para descartar patología. El 24,7% (LC: 17,1-29,2 son pruebas innecesarias y en el 15,2 % (LC:10,7-18,2 hubo presión del enfermo en la solicitud. En el análisis multivariante se observan diferencias significativas para Rx de tórax, cambios en el tratamiento y ser presionado por el enfermo. Tras ajustar por las otras variables, la solicitud de una prueba innecesaria es 12,55 veces mayor si el médico se siente presionado por el enfermo. Conclusiones: Debe analizarse la correcta indicación de la radiología, especialmente de la ósea, y se debe potenciar al radiólogo en la decisión última de realizar la prueba diagnóstica.

  14. A

    Directory of Open Access Journals (Sweden)

    Morteza Bahram

    2016-09-01

    Full Text Available We report on a new method for the preconcentration and microextraction of analytes from aqueous samples using a pH-sensitive hydrogel. It is referred to as semisolid–liquid dispersive microextraction (SSLDM and has the advantages of both dispersive liquid–liquid microextraction (DLLME and solid-phase extraction (SPE. The surface area of the droplets is large, so the equilibrium state is quickly reached. The high density of the gel facilitates phase separation, and disadvantages of existing methods are overcome in that there is no need for extraction and dispersive solvents (as in conventional DLLME and no need for desorption (as in SPE. The SSLDM method integrates sampling, extraction and concentration into one single and solvent-free step. The method was exemplarily applied to the preconcentration of malachite green (MG and crystal violet (CV which then were quantified by spectrophotometry. Specifically, poly (styrene-alt-maleic acid, a pH-sensitive hydrogel, was used to extract MG and CV from water samples. The linear analytical range is from 0.01 to 1 μmol L−1 for MG, and from 0.05 to 1 μmol L−1 for CV. The correlation coefficient for MG and CV is 0.999 and 0.993, respectively. The limit of detection for MG and CV is 0.011 and 0.014 μmol L−1, respectively.

  15. In-Situ Estimates of tidal mixing in the Indonesian archipelago from multidisciplinary data

    Science.gov (United States)

    Koch-Larrouy, Ariane; Atmadipoera, Agus; van Beek, Pieter; Madec, Gurvan; Aucan, Jerome; Lyard, Florent; Grelet, Jacques; Souhaut, Marc

    2015-04-01

    The Indonesian Mixing program (INDOMIX) was designed to quantify the very strong mixing that transforms Pacific waters into homohaline Indonesian Waters in the Indonesian archipelago. The turbulent dissipation rates and associated mixing were estimated and analyzed using a multidisciplinary approach that combines physical and geochemical observations: 1) direct measurements of the dissipation using a microstructure profiler, 2) use of density-based fine-scale methods, and 3) study of the vertical distribution of natural radionuclides (radium isotopes and actinium-227). Data were collected at five contrasting stations within the Indonesian archipelago. Strong instabilities, inversions of the density profiles and a very strong water mass transformation were observed. A wide range of values is obtained for dissipation within [10-10, 10-4] W.kg-1 with spots of higher dissipation in the ocean interior correlated with a strong internal tide signal. Both Fine-scale and micro-scale methods allow us to identify very strong dissipation energy levels above the straits, ranging within [10-7, 10-4] W.kg-1, in contrast to lower values at stations far from generation sites. However, the dissipation in the interior water column for the station located in the center of Halmahera [10-9, 10-8] W.kg-1 is stronger than for the Banda station [10-11, 10-10] W.kg-1, which is further away from generation sites. The three approaches agree relatively well and provide Kz values ranging between 5 10-4 and 5 10-1 m2.s-1, except in the Banda Sea where values are similar to the ones found in the open ocean (10-6 m2.s-1). Kz values mainly increase toward the bottom, where stratification decreases. Surface mixing, at the base of the mixed layer is found to be still very strong with values within [10-4, 10-3 m2.s-1]. These results confirm the results of modelling studies, in which hypothesis of intensified subsurface mixing were made, a mixing that strongly modifies the whole tropical mean state and

  16. Radiation doses to members of the U.S. population from ubiquitous radionuclides in the body: Part 1, autopsy and in vivo data.

    Science.gov (United States)

    Watson, David J; Strom, Daniel J

    2011-04-01

    This paper is Part 1 of a three-part series investigating steady-state effective dose rates to residents of the United States from intakes of ubiquitous radionuclides, including radionuclides occurring naturally, radionuclides whose concentrations are technologically enhanced, and anthropogenic radionuclides. This series of papers explicitly excludes intakes from inhaling (222)Rn, (220)Rn, and their short-lived decay products; it also excludes intakes of radionuclides in occupational and medical settings. In this work, it is assumed that instantaneous dose rates in target organs are proportional to steady-state radionuclide concentrations in source regions. The goal of Part 1 of this work was to review, summarize, and characterize all published and some unpublished data for U.S. residents on ubiquitous radionuclide concentrations in tissues and organs. Forty-five papers and reports were obtained and their data reviewed, and three data sets were obtained via private communication. The 45 radionuclides of interest are the (238)U series (14 nuclides), the actinium series (headed by (235)U; 11 nuclides), and the (232)Th series (11 nuclides); primordial radionuclides (87)Rb and (40)K; cosmogenic and fallout radionuclides (14)C and (3)H; and purely anthropogenic radionuclides (137)Cs-(137m)Ba, (129)I, and (90)Sr-(90)Y. Measurements judged to be relevant were available for only 15 of these radionuclides: (238)U, (235)U, (234)U, (232)Th, (230)Th, (228)Th, (228)Ra, (226)Ra, (210)Pb, (210)Po, (137)Cs, (87)Rb, (40)K, (14)C, and (3)H. Recent and relevant measurements were not available for (129)I and (90)Sr-(90)Y. A total of 11,741 radionuclide concentration measurements were found in one or more tissues or organs from 14 states. Data on age, gender, geographic locations, height, and weight of subjects were available only sporadically. Too often authors did not provide meaningful values of uncertainty of measurements, so that variability in data sets is confounded with

  17. TINGKAT KANDUNGAN UNSUR RADIOAKTIF AIR SUNGAI AYUNG DI DENPASAR BALI

    Directory of Open Access Journals (Sweden)

    Dewa Nyoman Alit Ardana

    2012-11-01

    Full Text Available Ayung river is one of the longest rivers in Bali. The upstream of the river is in regency of Bangli, Badung, Buleleng, Tabananand downstream is located in Padang Galak beach, East Denpasar Sub-regency. As the sample of the study, the water of the river wastaken from the stream entering the city of Denpasar. The sample was taken in five different points and for each point was taken twice. Thefirst was taken at 5 p.m, and the second was at 6 a.m. This study aims at finding out the rate of radioactive content of Ayung river water inthe city of Denpasar.The water sample was analyzed in Radiometry Analysis Group of Radiation Physics and environmental research centre andNuclear Technique Development, Jalan Taman Sari 71 Bandung – 40132. The process of counting was conducted in this place in order toknow the rate of the element activities and then identification of elements contens in the sample. The result of the counting and identifyingwas compered with standard grade of radioactivity in the area.The element of identification result and the amount of activity rate found showed that the element were natural radioactiveelements, the content: 40K (Kalium-40, 234Th (Thorium-234, 233Th (Thorium-233, 228Ac (Actinium-288, 114mIn (Indium-114m. Thehighest activity of radioactive elements in each sample point: in E2 point content element 40K with the activity 2.08 Bq/lt, in point A1 234Thwith the activity 16.34 Bq/lt, in point E1 containts 233Th with activity 598.29 Bq/lt, in point E1 and E2 contain 228Ac with the activity939.63 Bq/lt. The height of activity value of the counting and identifying elements was still under the rate of the highest level.The result of the study showed that radioactive elements 40K had the tendency of increasing radioactivity. The same thinghappened to 233Th at the peak of energi 185.00 keV. The content of its radioactive tends to exist in each point of sample point and theactivity tends to increase. Though the rate of

  18. DISSOLVED CONCENTRATION LIMITS OF RADIOACTIVE ELEMENTS

    Energy Technology Data Exchange (ETDEWEB)

    P. Bernot

    2005-07-13

    The purpose of this study is to evaluate dissolved concentration limits (also referred to as solubility limits) of elements with radioactive isotopes under probable repository conditions, based on geochemical modeling calculations using geochemical modeling tools, thermodynamic databases, field measurements, and laboratory experiments. The scope of this activity is to predict dissolved concentrations or solubility limits for elements with radioactive isotopes (actinium, americium, carbon, cesium, iodine, lead, neptunium, plutonium, protactinium, radium, strontium, technetium, thorium, and uranium) relevant to calculated dose. Model outputs for uranium, plutonium, neptunium, thorium, americium, and protactinium are provided in the form of tabulated functions with pH and log fCO{sub 2} as independent variables, plus one or more uncertainty terms. The solubility limits for the remaining elements are either in the form of distributions or single values. Even though selection of an appropriate set of radionuclides documented in Radionuclide Screening (BSC 2002 [DIRS 160059]) includes actinium, transport of Ac is not modeled in the total system performance assessment for the license application (TSPA-LA) model because of its extremely short half-life. Actinium dose is calculated in the TSPA-LA by assuming secular equilibrium with {sup 231}Pa (Section 6.10); therefore, Ac is not analyzed in this report. The output data from this report are fundamental inputs for TSPA-LA used to determine the estimated release of these elements from waste packages and the engineered barrier system. Consistent modeling approaches and environmental conditions were used to develop solubility models for the actinides discussed in this report. These models cover broad ranges of environmental conditions so they are applicable to both waste packages and the invert. Uncertainties from thermodynamic data, water chemistry, temperature variation, and activity coefficients have been quantified or

  19. Transition wavelengths and unresolved transition array statistics of ions with Z = 72-89

    Energy Technology Data Exchange (ETDEWEB)

    Kilbane, D, E-mail: Deirdre.Kilbane@ucd.ie [School of Physics, University College Dublin, Belfield, Dublin 4 (Ireland)

    2011-08-28

    Potential extreme ultraviolet and soft x-ray radiation sources have been identified, using the flexible atomic code (FAC), as emission peaks arising from the 4d-4f and 4p-4d transitions in Pd-like to Rb-like ions of hafnium through actinium. The effects of configuration interaction are investigated and for increasing nuclear charge, these strong emitters are seen to separate and move to shorter wavelengths. Each source is characterized using the unresolved transition array model. They are proposed to complement the currently used nitrogen and argon sources in the 'water window', and as possible successors to tin in next-generation lithography.

  20. Detection of rare earth elements in Powder River Basin sub-bituminous coal ash using laser-induced breakdown spectroscopy (LIBS)

    Energy Technology Data Exchange (ETDEWEB)

    Tran, Phuoc [National Energy Technology Lab. (NETL), Pittsburgh, PA, (United State; Mcintyre, Dustin [National Energy Technology Lab. (NETL), Pittsburgh, PA, (United State

    2015-10-01

    We reported our preliminary results on the use of laser-induced breakdown spectroscopy to analyze the rare earth elements contained in ash samples from Powder River Basin sub-bituminous coal (PRB-coal). We have identified many elements in the lanthanide series (cerium, europium, holmium, lanthanum, lutetium, praseodymium, promethium, samarium, terbium, ytterbium) and some elements in the actinide series (actinium, thorium, uranium, plutonium, berkelium, californium) in the ash samples. In addition, various metals were also seen to present in the ash samples

  1. The Technological Enhancement of Normally Occurring Radioactive Materials in Red Mud due to the Production of Alumina

    Directory of Open Access Journals (Sweden)

    Maurice O. Miller

    2016-01-01

    Full Text Available This study investigates the level of technological enhancement of normally occurring radioactive materials (TENORM in the red mud waste due to the production of alumina in Jamaica. Technological enhancements factors (TEF were determined for the uranium, thorium, actinium series, their progenies, and the nonseries potassium-40 using gamma spectrometry. The study concluded that bauxite production technologically enhances the uranium progenies Th-234, Pb-214, Bi-214, and Pa-234 and the thorium-232 progenies Ac-228, Pb-212, and Bi-212 in red mud. The actinium series was technologically enhanced, but K-40 and the thorium daughter, Tl-208, were reduced. The spectrometric comparison of Tl-208 (at 510 keV was unexpected since its other photopeaks at 583 keV, 934 keV, and 968 keV were markedly different. An explanation for this anomaly is discussed. An explanation regarding the process of accumulation and fractionation of organically derived phosphate deposits and potassium-feldspar is offered to explain the spectrometric differences between the alumina product and its waste material, red mud.

  2. New production in the South China Sea

    Institute of Scientific and Technical Information of China (English)

    CAI; Pinghe

    2002-01-01

    [1]Dugdale, R. C., Goering, J. J., Uptake of new and regenerated nitrogen in primary productivity, Limnology and Oceanog-raphy, 1967, 12: 196-206.[2]Eppley, R. W., Peterson, B. J., Particulate organic matter flux and planktonic new production in the deep ocean, Nature, 1979, 282: 677-680.[3]Allen, C. B., Kanda, J., Laws, E. A., New production and photosynthetic rates within and outside a cyclonic mesoscale eddy in the North Pacific Subtropical gyre, Deep-Sea Research Ⅱ, 1996, 43(6): 917-936.[4]Jenkins, W. J., Tritium-helium dating in the Sargasso Sea: A measurement of oxygen utilization rates, Nature, 1977, 196: 291-292.[5]Spitzer, W. S., Jenkins, W. J., Rates of vertical mixing, gas exchange and new production: Estimates from seasonal gas cy-cle in the upper ocean near Bermuda, Journal of Marine Research, 1989, 47: 169-196.[6]Sarmiento, J. L., Thiele, G., Key, R. M. et al., Oxygen and nitrate new production and remineralization in the North At-lantic Subtropical Gyre, Journal of Geophysical Research, 1990, 95: 18303-18315.[7]Ku, T. L., Luo, S., Kusakabe, M. et al., 228Ra-derived nutrient budgets in upper equatorial Pacific and the role of "new" silicate in limiting productivity, Deep-Sea Research II, 1995, 42(2/3): 479-497.[8]Wheeler, P. A., Rates of nitrate assimilation at the equator during the US-JGOFS spring time series: Estimates of new pro-duction, EOS, Transactions, American Geophysical Union, 1992, 73: 281.[9]Huang, Y., Xie, Y., Chen, M. et al., Distribution feature of 228Ra in surface seawater of the Nansha sea area, in Isotopes Marine Chemistry of Nansha Islands Waters (in Chinese), Beijing: Ocean Press, 1996, 70-78.[10]Reid, D. F., Key, R. M., Schink, D., Radium, thorium and actinium extraction from seawater using an improved manga-nese-oxide-coated fiber, Earth and Planetary Science Letters, 1979, 43: 223-226.[11]Shi, W., Qiu, X., Huang, Y., Distribution of dissolved 226Ra in the Jiulongjiang-Xiamen bay

  3. 饲粮不同粗蛋白质水平对育肥羔羊小肠氨基酸流量及吸收率的影响%Effects of Different Dietary Crude Protein Levels on Amino Acid Flows and Absorbability in Small Intestine of Growing Lambs

    Institute of Scientific and Technical Information of China (English)

    牛露; 尹华; 郑猛; 甘麦邻; 陈傲东; 刘晨黎; 陈道富; 高巍

    2016-01-01

    This experiment was conducted to compare the effects of different dietary crude protein ( CP) levels on amino acid ( AA) flows and absorbability in small intestine of growing lambs. Three Kazakh male lambs [(30.0±3.7) kg of body weight] fitted with permanent ruminal, duodenal and ileal fistulas were selected. A 3×3 Latin square design was adopted. Dietary CP levels of different treatments were 11. 00%, 12. 00% and 13.00%, respectively; the pretest lasted for 10 days, and the test lasted for 10 days. A dual-phase marker sys-tem with lithium-chromium ethylenediamine tetra-acetate ( LiCr-EDTA ) and ytterbium-actinium ( Yb-Ac ) as liquid-phase and particulate-phase digesta flow makers was adopted to measure small intestinal digesta flows, respectively. The results showed as follows:the intake, apparent digestibility and retention of nitrogen were in-creased with increasing level of dietary CP, and 13% treatment was significantly higher than 11% treatment ( P0.05) . Although intestinal true digesta flows and amino acid absorbability were not signifi-cantly affected by the increasing dietary CP level ( P>0.05) , but the flows of nitrogen and total amino acids, as well as absorption rates of essential amino acids, such as arginine, hisitidine and lysine, were numerically increased. The results indicate that increasing dietary CP level has the potential to improve digestibility, intesti-nal digesta flows and amino acid absorption rate.%本研究旨在比较饲粮不同粗蛋白质( CP)水平对育肥羔羊小肠氨基酸( AA)流量及吸收率的影响。选用体重(30.0±3.7) kg,安装有瘤胃、十二指肠近端和回肠末端瘘管的3只哈萨克羊公羔为试验动物,采用3×3拉丁方试验设计,各处理饲粮CP水平分别为11.00%、12.00%和13.00%;预试期10 d,正试期10 d。采用镱锕( Yb-Ac)、锂铬乙二胺四乙酸( LiCr-EDTA)分别作为消化道固相和液相食糜标记物测定小肠食糜流量。结果表明:提高饲粮CP水平可

  4. A84a

    OpenAIRE

    T. Zavarykina; A. Burdennyy; Loginov, V.; E. Ignatova; E. Glazkova; M. Frolova; M. Stenina

    2015-01-01

    There is increasing evidence that BRCA1-related DNA-repair defects determine sensitivity to certain agents, such as platinum-based chemotherapy. There is a lot of evidence about a link between TNBC and BRCA1 deficiency. Many clinical characteristics and molecular features are shared by sporadic triple-negative breast cancer and BRCA1-associated breast cancer. The majority of BRCA1-related breast cancers are of basal-like/triple-negative phenotype. Identification of specific markers of BRCA1-d...

  5. Chromogranin A

    Science.gov (United States)

    ... Chromogranin A Related tests: Serotonin , 5-HIAA , Catecholamines , Tumor Markers All content on Lab Tests Online has been ... chromogranin A (CgA) test is used as a tumor marker . It may be ordered in combination with a ...

  6. Venice: a meeting, a plague, a death

    Directory of Open Access Journals (Sweden)

    Óscar Botasso

    2008-10-01

    Full Text Available Death in Venice is based on the novella of the same name by Thomas Mann, except that in the cinema version the main character, Gustav von Aschenbach, is a musician instead of a writer. Owing to poetic license not always within the layman’s grasp, Luchino Visconti also wished to identify the artist with Gustav Mahler. Beyond such dissimilarities, however, the film is a feasible recreation of the story and a faithful reconstruction of those times: a Venice divorced from its former splendor and invaded by a plague and yet at the same time still able to evoke the captivating, nostalgic legacy of its magnificent past. An ideal scenario indeed for the musical ideas of Mahler, and perfectly reflected in the Midnight Song and the adagietto of his third and fifth symphonies.

  7. A Writer, a Translator and a Translator

    OpenAIRE

    Katarina Marinčič

    2015-01-01

    The article deals with the French translation of the short story Amy by the Slovenian writer Mira Mihelič, made by Elza Jereb for the anthology Nouvelles slovènes (Paris, 1969). The original text, a classical narrative involving some modernist strategies, presents a syntactical feature rather unusual in Slovenian (although typical of the author Mira Mihelič): a very frequent use of participles and participial structures. Elza Jereb’s translation is accurate and precise, preserving not only th...

  8. A container

    DEFF Research Database (Denmark)

    2012-01-01

    A container assembly for the containment of fluids or solids under a pressure different from the ambient pressure comprising a container (2) comprising an opening and an annular sealing, a lid (3) comprising a central portion (5) and engagement means (7) for engaging the annular flange, and seali...

  9. A container

    DEFF Research Database (Denmark)

    2012-01-01

    A container assembly for the containment of fluids or solids under a pressure different from the ambient pressure comprising a container (2) comprising an opening and an annular sealing, a lid (3) comprising a central portion (5) and engagement means (7) for engaging the annular flange, and seali...

  10. Hepatitis A

    Science.gov (United States)

    ... an inflammation of the liver. One type, hepatitis A, is caused by the hepatitis A virus (HAV). The disease spreads through contact with ... washed in untreated water Putting into your mouth a finger or object that came into contact with ...

  11. Vitamin A

    Science.gov (United States)

    Vitamins are substances that your body needs to grow and develop normally. Vitamin A plays a role in your Vision Bone growth Reproduction Cell functions Immune system Vitamin A is an antioxidant. It can come from ...

  12. A literatura e a teologia

    Directory of Open Access Journals (Sweden)

    Genilma Boehler

    2011-04-01

    Full Text Available Trata-se de uma reflexão sobre literatura e teologia, pontualmente sobre poesia e teologia. Como afirmou Edgar Morin “a literatura tem a vantagem de refletir sobre a complexidade do ser humano e sobre a quantidade incrível de seus sonhos” (MORIN, 2009:6. Já a teologia, como definida por Rubem Alves, é “um jeito de falar sobre tais coisas dando-lhes um nome e apenas distinguindo-se da poesia porque a teologia é sempre feita como prece...” (ALVES, 2005:21. O encontro das duas é a ocasião para que seja feita uma reflexão acerca de Deus, a partir do espaço da poesia, recorrendo a outra linguagem, outro conhecimento, outras bibliotecas, considerando o corpo, o desejo, a vida, o mundo na medida em que apresenta a pessoa, a sociedade e a cultura.

  13. Algebra? A Gate! A Barrier! A Mystery!

    Science.gov (United States)

    Mathematics Educatio Dialogues, 2000

    2000-01-01

    This issue of Mathematics Education Dialogues focuses on the nature and the role of algebra in the K-14 curriculum. Articles on this theme include: (1) "Algebra For All? Why?" (Nel Noddings); (2) "Algebra For All: It's a Matter of Equity, Expectations, and Effectiveness" (Dorothy S. Strong and Nell B. Cobb); (3) "Don't Delay: Build and Talk about…

  14. Northrop A-17A Nomad

    Science.gov (United States)

    1940-01-01

    Northrop A-17A Nomad: In the spring of 1939 the NACA tested an experimental cowling and cooling system on Northrop's A-17A. Various types and combinations were tried, but the NACA cowl first used seemed to work best, as no modifications made their way onto 'line' aircraft.

  15. Hemophilia A

    Science.gov (United States)

    Factor VIII deficiency; Classic hemophilia; Bleeding disorder - hemophilia A ... When you bleed, a series of reactions take place in the body that helps blood clots form. This process is called the coagulation ...

  16. A118

    Directory of Open Access Journals (Sweden)

    A. Kozlov

    2015-11-01

    It can be concluded that expression of protogenes, evolutionarily young and/or novel genes in tumors might be a new biological phenomenon, a phenomenon of carcino-evo-devo genes, predicted by the hypothesis of evolution by tumor neofunctionalization.

  17. Vitamin A

    Science.gov (United States)

    ... carotenoid is beta-carotene. Beta-carotene is an antioxidant. Antioxidants protect cells from damage caused by substances called ... A can lead to hyperkeratosis or dry, scaly skin. If you get too much vitamin A, you ...

  18. A nudez

    Directory of Open Access Journals (Sweden)

    Viviana C. Velasco Martínez

    Full Text Available O objetivo deste artigo é apresentar um mito e o seu herói. É com esse material simbólico que pretendo enfocar temas freudianos clássicos, como a sexualidade infantil, o pudor, a crueldade, o fetichismo, o exibicionismo e a castração e, assim, esboçar o contorno de uma possível fantasia neurótica inconsciente, onde a perversão encontrase em negativo.

  19. A Dream

    Institute of Scientific and Technical Information of China (English)

    Cecile; Fries

    2013-01-01

    <正>The rising sun flames clouds. Through the airplane window I am enjoying the clouds with golden edges. In a few hours I will set foot on the soil of China, a country that has always been in my dreams. Thoughts thronged my mind. Perhaps, in my life I will never have a chance to travel to China, a faraway, strange and mysterious country;

  20. Hepatitis A

    Science.gov (United States)

    ... inflammation of the liver.” This inflammation can be caused by a wide variety of toxins, drugs, and metabolic diseases, as well as infection. There are at least 5 hepatitis viruses. Hepatitis A is contracted when a child eats food or drinks water that is contaminated with the virus or has ...

  1. A prog

    DEFF Research Database (Denmark)

    Meldgaard, Anette; Hansen, Torben Bæk; Dalsgaard, Jesper

    2009-01-01

    Background: Endoscopic carpal tunnel release with a single portal technique has been shown to reduce sick leave compared to open carpal tunnel release, claiming to be a less invasive procedure and reducing scar tenderness leading to a more rapid return to work, and the purpose of this study was t...

  2. A Keyboard

    DEFF Research Database (Denmark)

    2008-01-01

    The present invention relates to a keyboard with a plurality of keys with key switches that are covered by a flexible display for displaying individual labels of the keys whereby the label can be changed during operation of the keyboard by appropriate control of the keyboard. The flexible display...

  3. A new

    NARCIS (Netherlands)

    Giusberti, L.; Bannikov, A.; Galazzo, F.B.; Fornaciari, E.; Frieling, J.; Luciani, V.; Papazzoni, C.A.; Roghi, G.; Schouten, S.; Sluijs, A.; Bosellini, F.R.; Zorzin, R.

    2014-01-01

    Hemipelagic dark limestones within calciturbiditic deposits at Monte Solane in the western Lessini Mountains of northern Italy yield a fish fauna dominated by stomiiforms. A minor component of the fossil assemblage is represented by a macroalgal non-calcareous flora associated with rarer terrestrial

  4. Hepatitis A

    Science.gov (United States)

    ... receiving the shot. About 1 out of 10 children may have a mild fever or poor appetite. If these problems occur, they usually last a day or two. However, vaccines like any medicine, could ver y rarely cause a severe allergic ... as children grow up. •Prevents hospitalizations among older children and ...

  5. A atmosfera

    OpenAIRE

    Gómez Fórneas, Esther; Rodríguez Silva, Laura

    2009-01-01

    Enxeñaría Técnica Agrícola Despois de estudar os conceptos básicos da química, as propiedades dos gases, os líquidos, os sólidos, as disolucións, os enlaces químicos, as forzas intermoleculares e visto como a cinética química e os conceptos de equilibrio axudan a entender a natureza das reaccións químicas, neste tema imos aplicar estes coñecementos ao estudo do sistema atmosfera. No entanto que a composición da atmosfera da terra é bastante simple, a súa química é moi complexa e nunca se c...

  6. A laser

    Energy Technology Data Exchange (ETDEWEB)

    Togo, N.

    1984-06-19

    It is reported that an improved laser design employing pumping of the active gas medium has been developed. A diagram of the laser system is given and its principle of operation is described in detail. Gas pumping is achieved using a pump whose oil reservoir is sealed by a sealing element. When the sealing element fails, the oil from the reservoir pollutes the laser substance. It is proposed that an additional oil reservoir pumping loop be used to maintain a lower pressure. The reservoir pressure is recorded by a sensor. When the sealing element fails, the pressure in the reservoir increases. The sensor records the change in pressure and generates a signal which shuts down the laser system. Thus, the possibility for oil penetration into the gas system is totally eliminated.

  7. A "Network" and a "Dictum"

    DEFF Research Database (Denmark)

    Harder, Henrik

    2003-01-01

    The spatial problems encountered in urban areas, for instance "sprawl", "the fragmented town" etc. However, the critic should concentrate more on a small "network" of a few architects and planners, including an inspector (C. D. Buchanan, UK) and a single policeman (H. Alker Tripp, UK) who were he...

  8. A Joke

    Institute of Scientific and Technical Information of China (English)

    王秀军

    2005-01-01

    O ne hot sum m er day, a student in sweat, fanning him self w ith abook,asked his teacher,“Its rather too hotin the classroom .M ay I wearshorts while having classes, Sir?” “Itdoesn t m atter whether you wearshorts or not, but I m ust let you know , when you enter the classroom ,you m ust wear a pair oftrousers,”the teacher replied.A Joke!河北@王秀军

  9. A dor

    Directory of Open Access Journals (Sweden)

    Manoel Tosta Berlinck

    Full Text Available Este trabalho relata pesquisa sobre a natureza psicopatológica da dor partindo da noção de que o humano habita na dor. Esta passa, assim, a ser um conceito-limite do humano que não consegue ultrapassá-la, apesar dos recursos farmacológicos e psíquicos disponíveis para dela se proteger. Nesta perspectiva, o corpo humano solicita uma concepção que seja capaz de levar em consideração tanto a dor física como a psíquica.

  10. $A$ searches

    CERN Document Server

    Beacham, James

    The Standard Model of particle physics encompasses three of the four known fundamental forces of nature, and has remarkably withstood all of the experimental tests of its predictions, a fact solidified by the discovery, in 2012, of the Higgs boson. However, it cannot be the complete picture. Many measurements have been made that hint at physics beyond the Standard Model, and the main task of the high- energy experimental physics community is to conduct searches for new physics in as many di↵erent places and regimes as possible. I present three searches for new phenomena in three di↵erent high-energy collider experiments, namely, a search for events with at least three photons in the final state, which is sensitive to an exotic decay of a Higgs boson into four photons via intermediate pseudoscalar particles, a, with ATLAS, at the Large Hadron Collider; a search for a dark photon, also known as an A0 , with APEX, at Thomas Je↵erson National Accelerator Facility; and a search for a Higgs decaying into four...

  11. Hepatitis A

    Science.gov (United States)

    ... care, food, or sewage industry Other common hepatitis virus infections include hepatitis B and hepatitis C. Hepatitis A is the least serious and mildest of these diseases. Symptoms ... most often show up 2 to 6 weeks after being exposed to the hepatitis A virus. They are most often mild, but may last ...

  12. A Dog

    Institute of Scientific and Technical Information of China (English)

    韩选文

    2004-01-01

    A dog can't speak words, but it can "talk", It has feelings just as you do. At times it may feel angry or afraid. Watching a dog closely, you can find out what it feels. You can see what it is trying to tell you.

  13. A Proposal

    Institute of Scientific and Technical Information of China (English)

    2012-01-01

    正All the students in our school, A sudden 8.0 earthquake happened in Wenchuan, Sichuan Province at 2:28 on the afternoon of May 12, 2008. Many houses fell down and lots of people have become homeless. A large number of people were badly injured and so many people lost their lives. The people in

  14. A Joke

    Institute of Scientific and Technical Information of China (English)

    Simon; Lindley

    2005-01-01

    W orking at the post office,Im used to dealing with a m oody public.So w hen one irate custom er storm ed m y desk,I responded in m y calm estvoice,“W hats the trouble?”“I w ent out this m orning,”she began,“and when I cam e hom e Ifound a card saying the m ailm an tried to deliver a package but no onewas hom e.M y husband was in allm orning.H e never heard a thing!”A fter apologizing,I gother parcel.“O h,good,”she gushed.“W e ve been w aiting for this for ages.”“W hat is it?”I asked.“M y husband s new hear...

  15. A atmosfera

    OpenAIRE

    Gómez Fórneas, Esther; Rodríguez Silva, Laura

    2009-01-01

    Despois de estudar os conceptos básicos da química, as propiedades dos gases, os líquidos, os sólidos, as disolucións, os enlaces químicos, as forzas intermoleculares e visto como a cinética química e os conceptos de equilibrio axudan a entender a natureza das reaccións químicas, neste tema imos aplicar estes coñecementos ao estudo do sistema atmosfera. No entanto que a composición da atmosfera da terra é bastante simple, a súa química é moi complexa e nunca se comprendeu por completo. Os pro...

  16. A Rejoinder

    Directory of Open Access Journals (Sweden)

    Nelson Lichtenstein

    2006-03-01

    Full Text Available It is a pleasure and a challenge to engage these commentaries on my recent book, State of the Union: a Century of American Labor. The pleasure is there because this author, like almost every other, is deeply appreciative of the kind of critical attention, and sheer energy, to which his work is subject. The commentators assembled by Jean‑Christain Vinel understood with remarkable precision the main line of argument I was trying to advance, which has not always been the case on the American sid...

  17. A quackery with a difference

    DEFF Research Database (Denmark)

    Wahlberg, Ayo

    2007-01-01

    in which regulatory authorities in the UK have come to address what is invariably described as a ‘growing interest in CAM’, I will show how the problem of quackery today is increasingly located in an ethical field of practitioner competency, qualifications, conduct, responsibility and personal professional...... health. Yet, in this paper, I argue that this is only one form that the problem of ‘quackery’ has taken in the past two centuries or so in the United Kingdom. Just as Roy Porter showed how the mid-19th century professionalization of medicine gave rise to a ‘quackery with a difference’ as a whole range...

  18. Hepatitis A

    Science.gov (United States)

    ... Hepatitis A is more common in parts of Africa, Asia, Central and South America, and Eastern Europe ... la salud en español Health Statistics Healthy Moments Radio Broadcast Clinical Trials For Health Professionals Diabetes Discoveries & ...

  19. A madruga

    Directory of Open Access Journals (Sweden)

    Porfirio Robau

    2015-03-01

    Full Text Available Yo soy de allá, de Madruga, un pueblo próspero y sano, adonde la piel del llano no envejece ni se arruga. De donde el guajiro enyuga los bueyes de madrugada, y la carreta cargada, del corte al basculador va repartiendo un olor a caña recién cortada.   Madruga, verde paisaje de valles, lomas y ríos, de pintorescos bohíos y cielo azul sin celaje. Desde mi último viaje no sé de tus cordilleras tus calles tus palmeras ni el hogar que yo tenía, adonde alegre vivía sin pesares ni quimeras.   Porfirio Robau (1914-1993 Poeta Cubano

  20. Hall A

    Data.gov (United States)

    Federal Laboratory Consortium — The instrumentation in Hall A at the Thomas Jefferson National Accelerator Facility was designed to study electroand photo-induced reactions at very high luminosity...

  1. Q & A

    Directory of Open Access Journals (Sweden)

    Prof.. Adam Micolich

    2012-07-01

    Full Text Available Prof. Adam Micolich is a researcher based at the University of New South Wales, specializing in the study of semiconductor systems. Materials Today recently spoke to Adam for our podcast.

  2. A Symposium.

    Science.gov (United States)

    Rachal, John R.

    2003-01-01

    Uses the framework of a symposium to present an imagined discussion by historical figures about whether and how knowledge might be acquired. Discussants include Democritus, Protagoras, Heraclitus, Socrates, Jesus, Gorgias, Nietzsche, Buddha, and Kierkegaard. (Contains 40 endnotes.) (SK)

  3. A Symposium.

    Science.gov (United States)

    Rachal, John R.

    2003-01-01

    Uses the framework of a symposium to present an imagined discussion by historical figures about whether and how knowledge might be acquired. Discussants include Democritus, Protagoras, Heraclitus, Socrates, Jesus, Gorgias, Nietzsche, Buddha, and Kierkegaard. (Contains 40 endnotes.) (SK)

  4. A laser

    Energy Technology Data Exchange (ETDEWEB)

    Togo, N.

    1984-06-19

    The development of an improved gas laser system employing pumping of the active gaseous medium is reported. The layout of the design is given and its principle of operation is described in detail. The oil reservoir in the vacuum pump which pumps the gas through the laser system is separated by a sealing element; when this element fails, the oil may pollute the active medium. It is proposed that an additional oil reservoir pumping loop be used with the pump that operates continuously and maintains a lower pressure in the reservoir. The pressure in the reservoir is monitored by a special sensor. When the sealing element fails, the pressure sensor records the pressure drop in the oil reservoir. A signal is then generated and the laser system ceases operation, and eliminates the possibility for the oil penetrating into the pumping system.

  5. A laser

    Energy Technology Data Exchange (ETDEWEB)

    Togo, N.; Syundzo, Yo.

    1984-06-19

    It is reported that an improved gas laser design using pumping of the active medium has been developed. A diagram of the laser system is given in graph form and its principle of operation is briefly described. A special sealing element is used in such lasers to seal the reservoir containing the oil in the pump which pumps the gas active medium. When the sealing element fails, there is the danger of oil penetration into the active laser medium. It is proposed that an additional pump which continually evacuates the oil reservoir during laser system operation be used. Thus, a low pressure is maintained in the reservoir. If the sealing element fails, the secondary pump generates a gas flow from the pumping system to the reservoir and eliminates gas penetration into the laser medium.

  6. A110

    Directory of Open Access Journals (Sweden)

    T. Malivanova

    2015-11-01

    Conclusions: This study found out the opposite effect of polymorphisms at −238 and −308 positions in TNF promoter on the outcome of BC patients. Carriers of low expressed allele −238(A have poor outcome because of low response to standard hormone therapy which presumably connected with the activation of Her2 pathway. The obtained results allow supposing that a special approach to the treatment of this group of BC patients should be used.

  7. A89

    Directory of Open Access Journals (Sweden)

    E. Vorontsova

    2015-11-01

    Thus, hepatocyte-derived exosome population should be useful in our further understanding of the hepatic function and in the identification of components that may serve as biomarkers for hepatic alterations. These tumor-derived extracellular vesicles represent a mediator of the tumor microenvironment, and their presence in the peripheral circulation may serve as a surrogate for tumor biopsies, enabling real-time diagnosis and disease monitoring.

  8. A JOKE

    Institute of Scientific and Technical Information of China (English)

    2000-01-01

    Grandpa and granddaughter were sitting talking when she asked,“Did God make you,Grandpa?”“Yes,God made me,”the grandfather answered.A few minutes later,the little girl asked him,“Did God make me too?”“Yes,He did,”the older man answered.For a few minutes,the little girl seemed to be studying

  9. A Queda

    Directory of Open Access Journals (Sweden)

    ANTÔNIO LASSANCE

    2009-11-01

    Full Text Available O mundo é outro, desde a queda do Muro
    de Berlim. Ela representa o fim do século XX, da
    geografia baseada na divisão entre Primeiro, Segundo
    e Terceiro Mundos e do modelo monolítico soviético.
    Após a queda, expandiu-se o processo de formação
    de blocos econômicos e o surgimento de um pólo
    dinâmico do capitalismo que muitos consideram
    como sinal de um novo ciclo hegemônico (asiático,
    capitaneado pela China. Mas os dilemas e riscos
    atuais não são menores do que os do passado. Que
    o digam a queda das torres gêmeas e o ataque ao
    Pentágono, no 11 de setembro de 2001, a proliferação
    de redes terroristas, a ameaça nuclear latente e as
    crises econômicas sistêmicas.

  10. Measurement and Calculation of Rare Earth Mine Tailings Radioactivity%稀土尾矿砂放射性活度的测量与计算

    Institute of Scientific and Technical Information of China (English)

    苑超; 周程; 朱晓翔; 杨师俨; 戴耀东

    2015-01-01

    It is of great significance to measure and calculate rare earth tailing radioactivity for the develop-ment of appropriate standards and exemption disposal. The total activity concentration of the three natural decay series (uranium series, thorium series, actinium series) was analyzed under the equilibrium and disequi-librium state according to the selected characteristic γ-rays. At the same time, we calculated the total activity concentration and the radioactivity for each radionuclide based on the general kinetic equations of decay chain and studied the trend of each radionuclide of thorium-series under different degrees of disequilibrium with time. The results demonstrated that the total radioactivity of α and β calculated in disequilibrium state was more closed to the actual measurement results compared to that in equilibrium state. In addition, the activity changes with time of thorium series in disequilibrium state are related to the initial activity concentration of the mother nuclide and 228Ra. If the activity concentration of 228Ra is less than that of 232Th, the total activity peak will be 10 times to maternal activity and appear after 60 a when the thorium series become balance again. If the activity concentration of 228Ra is greater than that of 232Th, the maximum total activity will appear in 3.82 a, and will be the sum of 4.57 times of the initial activity concentration of the mother nuclide and 5.25 times of the initial activity concentration of the first daughter 228Ra. Therefore, the rare earth tailings have been in disequilibrium state, and its total activity concentration should be determined based on the activity concentration of several feature radionuclides. In addition, the maximum value of the activity concentration is profitable to judge whether the activity concentration is fit with relevant regulations and standards.%准确测量并计算稀土尾矿砂的放射性活度浓度及其变化规律对制定相应的豁免标准和日后

  11. A School without a Principal.

    Science.gov (United States)

    Barnett, Demian; McKowen, Charlene; Bloom, Gary

    1998-01-01

    Teachers at a central California high school operate the school according to a strict, progressive set of principles. The Anzar communication guidelines specify teachers' commitment to communicating well, collective ownership of problems and problem solving, tolerance of differing ideas, individual accountability, dedication to helping and…

  12. A Blizzard of a Value

    Science.gov (United States)

    Bostic, Jonathan D.

    2015-01-01

    "Who has been to Dairy Queen® and purchased a Blizzard?®" Ms. Bosetti asked her students. During the summer, Bosetti had seen many of her former and future students at the local Dairy Queen enjoying Blizzard desserts and wondered, "Which Blizzard size is the best value?" She used this context for a ratios and proportions task…

  13. A Giant or a Dwarf?

    DEFF Research Database (Denmark)

    Schmid, Herman

    2005-01-01

    EU may appear to be a giant when it can act on behalf of a united Europe, but usually it is hampered by conflicting member state interests. The EU economic and administrative resources for foreign and trade policy are quite small (on level with one of its major member states) and the hopes in man...

  14. A comme... ("A" used as ...)

    Science.gov (United States)

    Beacco, J. C.; And Others

    1977-01-01

    A collection of four short articles giving detailed lesson plans using magazines, editorials and recipes to teach grammar. "A" is used as the example in these lesson plans. The first article deals with avoir and the past participle. (Text is in French.) (AMH)

  15. A Giant or a Dwarf?

    DEFF Research Database (Denmark)

    Schmid, Herman

    2005-01-01

    EU may appear to be a giant when it can act on behalf of a united Europe, but usually it is hampered by conflicting member state interests. The EU economic and administrative resources for foreign and trade policy are quite small (on level with one of its major member states) and the hopes in man...

  16. A Marshmallow and a Song

    Science.gov (United States)

    Kenney, Susan

    2009-01-01

    Music exists in time. One cannot get to the end of the song before going through the song. Is this significant for helping children wait? And can the way we present a singing game activity intensify the delay of what might be a gratifying moment at the end of the song? In this article, the author reflects on whether music can teach delayed…

  17. A Wolf and a Dog

    Institute of Scientific and Technical Information of China (English)

    薛刘阳; 方言(注); 陈恩枫(指导老师)

    2007-01-01

    A wolf and a dog live near the farm.One day,the wolf was very hungry.So he wanted to eat something.The wolf saw some chickens on the farm.He thought,"Oh,I'd like to eat them!"At night,the wolf ran into the chickens' home slyly.

  18. A School without a Principal.

    Science.gov (United States)

    Barnett, Demian; McKowen, Charlene; Bloom, Gary

    1998-01-01

    Teachers at a central California high school operate the school according to a strict, progressive set of principles. The Anzar communication guidelines specify teachers' commitment to communicating well, collective ownership of problems and problem solving, tolerance of differing ideas, individual accountability, dedication to helping and…

  19. SUDOKU A STORY & A SOLVER

    Energy Technology Data Exchange (ETDEWEB)

    GARDNER, P.R.

    2006-04-01

    Sudoku, also known as Number Place, is a logic-based placement puzzle. The aim of the puzzle is to enter a numerical digit from 1 through 9 in each cell of a 9 x 9 grid made up of 3 x 3 subgrids (called ''regions''), starting with various digits given in some cells (the ''givens''). Each row, column, and region must contain only one instance of each numeral. Completing the puzzle requires patience and logical ability. Although first published in a U.S. puzzle magazine in 1979, Sudoku initially caught on in Japan in 1986 and attained international popularity in 2005. Last fall, after noticing Sudoku puzzles in some newspapers and magazines, I attempted a few just to see how hard they were. Of course, the difficulties varied considerably. ''Obviously'' one could use Trial and Error but all the advice was to ''Use Logic''. Thinking to flex, and strengthen, those powers, I began to tackle the puzzles systematically. That is, when I discovered a new tactical rule, I would write it down, eventually generating a list of ten or so, with some having overlap. They served pretty well except for the more difficult puzzles, but even then I managed to develop an additional three rules that covered all of them until I hit the Oregonian puzzle shown. With all of my rules, I could not seem to solve that puzzle. Initially putting my failure down to rapid mental fatigue (being unable to hold a sufficient quantity of information in my mind at one time), I decided to write a program to implement my rules and see what I had failed to notice earlier. The solver, too, failed. That is, my rules were insufficient to solve that particular puzzle. I happened across a book written by a fellow who constructs such puzzles and who claimed that, sometimes, the only tactic left was trial and error. With a trial and error routine implemented, my solver successfully completed the Oregonian puzzle, and has successfully

  20. Thailandepsin A

    Directory of Open Access Journals (Sweden)

    Cheng Wang

    2011-11-01

    Full Text Available Thailandepsin A [systematic name: (E-(1S,5S,6R,9S,20R-6-[(2S-butan-2-yl]-5-hydroxy-20-[2-(methylsulfanylethyl]-2-oxa-11,12-dithia-7,19,22-triazabicyclo[7.7.6]docosa-15-ene-3,8,18,21-tetraone], C23H37N3O6S3, is a newly reported [Wang et al. (2011. J. Nat. Prod. doi:10.1021/np200324x] bicyclic depsipeptide that has potent histone deacetylase inhibitory activity and broad-spectrum antiproliferative activity. The absolute configuration of thailandepsin A has been determined from the anomalous dispersion and the stereochemistry of all chiral C atoms. Intramolecular N—H...O and N—H...S hydrogen bonds occur. Intermolecular N—H...O and O—H...O hydrogen bonds are observed in the crystal structure.

  1. A Model

    Institute of Scientific and Technical Information of China (English)

    Liu Zhiyang

    2011-01-01

    Similar to ISO Technical Committees,SAC Technical Committees undertake the management and coordination of standard's development and amendments in various sectors in industry,playing the role as a bridge among enterprises,research institutions and the governmental standardization administration.How to fully play the essential role is the vital issue SAC has been committing to resolve.Among hundreds of SAC TCs,one stands out in knitting together those isolated,scattered,but highly competitive enterprises in the same industry with the "Standards" thread,and achieving remarkable results in promoting industry development with standardization.It sets a role model for other TCs.

  2. A madruga

    OpenAIRE

    Porfirio Robau

    2015-01-01

    Yo soy de allá, de Madruga, un pueblo próspero y sano, adonde la piel del llano no envejece ni se arruga. De donde el guajiro enyuga los bueyes de madrugada, y la carreta cargada, del corte al basculador va repartiendo un olor a caña recién cortada.   Madruga, verde paisaje de valles, lomas y ríos, de pintorescos bohíos y cielo azul sin celaje. Desde mi último viaje no sé de tus cordilleras tus calles tus palmeras ni el h...

  3. A Life for a Life

    Institute of Scientific and Technical Information of China (English)

    严寒

    2004-01-01

    The English author, Richard Savage, was once living in London ingreat poverty. In order to earn a little money he had written the story" ofhis life. But not many copies of the book had been sold in the shops, and

  4. Appendix A

    DEFF Research Database (Denmark)

    Henriksen, M. S.; Brincker, Rune; Heshe, Gert

    1999-01-01

    In this appendix a brief summary of experiments on reinforced concrete beams in three-point bending performed at Aalborg University is given. The aim of the investigation is to determine the full load-deflection curves for different beam sizes, different types of concrete and different amounts an...

  5. A111

    Directory of Open Access Journals (Sweden)

    L. Buchynska

    2015-11-01

    Conclusion: Quantitative changes of some components of the tumor microenvironment such as CD4+-, CD8+-, FOXP3+-lymphocytes and content of FOXP3+-tumor cells correlate with the biological characteristics of EC and apparently have a significant role in the progression of this cancer.

  6. A Beginning.

    Science.gov (United States)

    Healy, Mary K.; Root, Phyllis

    Selected for their focus on man, acting to know, preserve and improve his environment, the items noted in this booklet furnish a resource base for developing an environmental ethic. Introductory statements enumerate values, understandings, and realizations to be developed and sample activities that may be conducted or adapted for grades K-12.…

  7. A75

    Directory of Open Access Journals (Sweden)

    D. Korobkov

    2015-11-01

    It may be concluded that the cellular and molecular mechanisms of breast cancer are complex. Therefore, carcinogenesis has a “multistep” nature and at least two or more mutations in the cells of the same clone – parent and child are required to generate malignant tumors. Thus, the development of oncogenic transformation does not necessarily mean the process of tumor formation.

  8. A Pulsar and a Disk

    Science.gov (United States)

    Kohler, Susanna

    2016-07-01

    Recent, unusual X-ray observations from our galactic neighbor, the Small Magellanic Cloud, have led to an interesting model for SXP 214, a pulsar in a binary star system.Artists illustration of the magnetic field lines of a pulsar, a highly magnetized, rotating neutron star. [NASA]An Intriguing BinaryAn X-ray pulsar is a magnetized, rotating neutron star in a binary system with a stellar companion. Material is fed from the companion onto the neutron star, channeled by the objects magnetic fields onto a hotspot thats millions of degrees. This hotspot rotating past our line of sight is what produces the pulsations that we observe from X-ray pulsars.Located in the Small Magellanic Cloud, SXP 214 is a transient X-ray pulsar in a binary with a Be-type star. This star is spinning so quickly that material is thrown off of it to form a circumstellar disk.Recently, a team of authors led by JaeSub Hong (Harvard-Smithsonian Center for Astrophysics) have presented new Chandra X-ray observations of SXP 214, tracking it for 50 ks (~14 hours) in January 2013. These observations reveal some very unexpected behavior for this pulsar.X-ray PuzzleThe energy distribution of the X-ray emission from SXP 214 over time. Dark shades or blue colors indicate high counts, and light shades or yellow colors indicate low counts. Lower-energy X-ray emission appeared only later, after about 20 ks. [Hong et al. 2016]Three interesting pieces of information came from the Chandra observations:SXP 214s rotation period was measured to be 211.5 s an increase in the spin rate since the discovery measurement of a 214-second period. Pulsars usually spin down as they lose angular momentum over time so what caused this one to spin up?Its overall X-ray luminosity steadily increased over the 50 ks of observations.Its spectrum became gradually softer (lower energy) over time; in the first 20 ks, the spectrum only consisted of hard X-ray photons above 3 keV, but after 20 ks, softer X-ray photons below 2 ke

  9. A Leitura e a Tela

    Directory of Open Access Journals (Sweden)

    Sérgio Luiz Alves da Rocha

    2015-09-01

      ABSTRACT This paper is a result of a doctoral research, in a public high school in Rio de Janeiro. The main objective of this work was to discuss - with teachers and students - some topics related to their conceptions and practices about reading, throughout pictures that were taken by them during the research. The different ideas about reading, the link between literary reading and other kinds of reading with "new technologies", the function of school, motivating - or not - the access to different places of reading, were some of the topics discussed throughout the research. During the research I analyzed reading as a cultural practice, as proposed by cultural history. The present text emphasizes a part of this discussion focusing on the relationship between image, reading and the school. Keywords: Lecture; Youth; Image; School; Television. RESUMEN Este trabajo es el resultado de una investigación doctoral , en una escuela secundaria pública en Río de Janeiro. El principal objetivo de este trabajo fue discutir - con maestros y estudiantes - algunos temas relacionados con sus concepciones y prácticas acerca de la lectura , a lo largo de las imágenes que fueron tomadas por ellos durante la investigación. Las diferentes ideas acerca de la lectura, la relación entre la lectura literaria y otros tipos de lectura con "nuevas tecnologías", la función de la escuela, motivando - o no - el acceso a los diferentes lugares de lectura, fueron algunos de los temas tratados a lo largo de la investigación. Durante la investigación la lectura fue tratada como práctica cultural, según lo propuesto por la historia cultural. El presente texto hace trata de una parte de esta discusión que se centra en la relación entre la imagen, la lectura y la escuela . Palabras Clave: Lectura; Juventud; Imagen; Escuela; Televisión.   Referências ADORNO, T.W. ; HORKHEIMER, M. A indústria cultural: o esclarecimento como mistificação das massas. In ______. Dialética do

  10. A, a Brominated Flame Retardant

    Directory of Open Access Journals (Sweden)

    Tomomi Takeshita

    2013-01-01

    Full Text Available Tetrabromobisphenol A (TBBPA, a brominated flame retardant, has been found to exacerbate pneumonia in respiratory syncytial virus- (RSV- infected mice. We examined the effect of Brazilian propolis (AF-08 on the exacerbation of RSV infection by TBBPA exposure in mice. Mice were fed a powdered diet mixed with 1% TBBPA alone, 0.02% AF-08 alone, or 1% TBBPA and 0.02% AF-08 for four weeks and then intranasally infected with RSV. TBBPA exposure increased the pulmonary virus titer and level of IFN-γ, a representative marker of pneumonia due to RSV infection, in the lungs of infected mice without toxicity. AF-08 was significantly effective in reducing the virus titers and IFN-γ level increased by TBBPA exposure. Also, AF-08 significantly reduced proinflammatory cytokine (TNF-α and IL-6 levels in the lungs of RSV-infected mice with TBBPA exposure, but Th2 cytokine (IL-4 and IL-10 levels were not evidently increased. Neither TBBPA exposure nor AF-08 treatment affected the anti-RSV antibody production in RSV-infected mice. In flow cytometry analysis, AF-08 seemed to be effective in reducing the ratio of pulmonary CD8a+ cells in RSV-infected mice with TBBPA exposure. TBBPA and AF-08 did not exhibit anti-RSV activity in vitro. Thus, AF-08 probably ameliorated pneumonia exacerbated by TBBPA exposure in RSV-infected mice by limiting excess cellular immune responses.

  11. A mascarada e a feminilidade

    Directory of Open Access Journals (Sweden)

    Grant Walkiria Helena

    1998-01-01

    Full Text Available Marcada por produções freudianas, a literatura analítica e, mais especificamente, aquela influenciada pelo ensino lacaniano, não pára de mostrar que as considerações anatômicas não são índices para falar da diferença de identidade sexual entre homens e mulheres. Diante do fato de que características masculinas continuavam presentes em mulheres adultas normais, Freud responde que ser mulher é ser mãe. A vacilação da verdade desta equação pode ser observada nas situações mais diversas nas quais podemos nos defrontar com mulheres, mães, desempenhando papéis de homens. Como pensar esta constatação? Este trabalho permitir-nos-á mostrar a imbricação do feminino e do masculino num caso de uma mulher com todas as características de uma feminilidade considerada normal, e também discutir a questão do gozo fálico e do Outro gozo - propostos por Lacan como índices de diferenciação da posição masculina e da feminina.

  12. A115

    Directory of Open Access Journals (Sweden)

    E. Dmitrieva

    2015-11-01

    Conclusion: Head and neck tumors are a rare group of clinically and biologically diverse neoplastic diseases. Among the residents of the Chelyabinsk region, men are 2–3 times more susceptible to cancer of the oral cavity and pharynx than women. High mortality rate is due to late referral of patients to specialized clinics; most head and neck cancer patients are diagnosed at advanced stages.

  13. ma a

    Directory of Open Access Journals (Sweden)

    Oscar del Barco, Trad. Davi Pessoa Carneiro

    2013-06-01

    Full Text Available Oscar del Barco escreveu o texto “ma a” para o catálogo ma a/Obra pictórica (Cór­doba, 2008, publicado na ocasião da exposição homônima, em que foram ex­postas 150 obras iné­ditas de distintos formatos e técnicas que del Barco vinha reali­zando há mais de 15 anos. Alguns escritores, artistas, ensaís­tas e pesquisadores, como Silvio Mattoni, Antonio Oviedo, Anamaría Ashwell, Gustavo Cosa­cov, Matías Lapezzata, entre outros, parti­ciparam da publi­cação. O texto foi posteriormente in­cluído em Alternativas de lo Posthumano (Buenos Aires: Caja Negra, 2010, com organização de Gabriel Livov e Pablo Gallardo. A tradução é do texto pu­blicado no mesmo livro (p. 279-283. [N.T.

  14. A Valedictory

    Science.gov (United States)

    Lagowski, J. J.

    1996-08-01

    "No man is an Iland, intire of it selfe.". These words were written by John Donne, the Dean of St. Paul's, and appear as his 17th Meditation in "Devotions upon emergent Occasions and several steps in my Sickness," published in 1624, a work in which he reflects upon his life in the midst of a serious illness (most likely typhus). Like many literary works, the words are timeless, and their meaning is not constrained to the occasion of their birth. Donne's meditation is easily transferred to the person who was, is, or will be, editor of this or any journal. No editor is an island. No editor can honestly claim to be "intire of it selfe." The Editor of the Journal rides on the tide generated by his staff, his reviewers, and his readers. I have been blessed with a marvelous staff, enormously energetic and dedicated. They have always been willing to go the last mile--and more if need be. Most--but not all--came to the Journal soon after it arrived in Austin. The bedrock on which the Journal has been built is its numerous reviewers, too many to thank individually on this page, but appreciated nonetheless for their individual contributions. Reviewers define the quality of a journal, and we have had a superb cohort working for us--voluntarily. I have to apologize publicly to some (you know who you are) who were abused by repeated requests on a short time base for their comments on manuscripts. This condition, which occurred more often than I would have liked, arose from the idiosyncratic confluence of manuscript flow, momentarily popular topics, and the need for certain kinds of expertise. I know that multiple requests for comments came too rapidly in some cases, but it was of paramount importance to get "good reviews" whom I could trust, and I knew where to turn. Thanks to all of you who stepped forward in such circumstances, with grace and good humor, to produce the quality reviews that were so valuable to me. No editor is an "Iland, intire of it selfe," especially when it

  15. DISSOLVED CONCENTRATION LIMITS OF RADIOACTIVE ELEMENTS

    Energy Technology Data Exchange (ETDEWEB)

    NA

    2004-11-22

    The purpose of this study is to evaluate dissolved concentration limits (also referred to as solubility limits) of elements with radioactive isotopes under probable repository conditions, based on geochemical modeling calculations using geochemical modeling tools, thermodynamic databases, field measurements, and laboratory experiments. The scope of this modeling activity is to predict dissolved concentrations or solubility limits for 14 elements with radioactive isotopes (actinium, americium, carbon, cesium, iodine, lead, neptunium, plutonium, protactinium, radium, strontium, technetium, thorium, and uranium) important to calculated dose. Model outputs for uranium, plutonium, neptunium, thorium, americium, and protactinium are in the form of tabulated functions with pH and log (line integral) CO{sub 2} as independent variables, plus one or more uncertainty terms. The solubility limits for the remaining elements are either in the form of distributions or single values. The output data from this report are fundamental inputs for Total System Performance Assessment for the License Application (TSPA-LA) to determine the estimated release of these elements from waste packages and the engineered barrier system. Consistent modeling approaches and environmental conditions were used to develop solubility models for all of the actinides. These models cover broad ranges of environmental conditions so that they are applicable to both waste packages and the invert. Uncertainties from thermodynamic data, water chemistry, temperature variation, and activity coefficients have been quantified or otherwise addressed.

  16. Purification of lanthanides for double beta decay experiments

    Energy Technology Data Exchange (ETDEWEB)

    Polischuk, O. G. [Institute for Nuclear Research, MSP 03680 Kyiv, Ukraine and INFN, Section of Rome, La Sapienza, I-00185 Rome (Italy); Barabash, A. S. [Institute of Theoretical and Experimental Physics, 117259 Moscow (Russian Federation); Belli, P. [INFN, Section of Rome Tor Vergata, I-00133 Rome (Italy); Bernabei, R. [INFN, Section of Rome Tor Vergata, I-00133 Rome, Italy and Department of Physics, University of Rome Tor Vergata, I-00133 Rome (Italy); Boiko, R. S.; Danevich, F. A.; Mokina, V. M.; Poda, D. V.; Tretyak, V. I. [Institute for Nuclear Research, MSP 03680 Kyiv (Ukraine); Cappella, F.; Incicchitti, A. [INFN, Section of Rome La Sapienza, I-00185 Rome, Italy and Department of Physics, University of Rome La Sapienza, I-00185 Rome (Italy); Cerulli, R.; Laubenstein, M.; Nisi, S. [INFN, Gran Sasso National Laboratories, I-67100 Assergi (Aq) (Italy)

    2013-08-08

    There are several potentially double beta active isotopes among the lanthanide elements. However, even high purity grade lanthanide compounds contain {sup 238}U, {sup 226}Ra and {sup 232,228}Th typically on the level of ∼ (0.1 - 1) Bq/kg. The liquid-liquid extraction technique was used to remove traces of U, Ra and Th from CeO{sub 2}, Nd{sub 2}O{sub 3} and Gd{sub 2}O{sub 3}. The radioactive contamination of the samples before and after the purification was tested by using ultra-low-background HPGe γ spectrometry at the underground Gran Sasso National Laboratories of the INFN (Italy). After the purification the radioactive contamination of gadolinium oxide by Ra and Th was decreased at least one order of magnitude. The efficiency of the approach to purify cerium oxide from Ra was on same level, while the radioactive contamination of neodymium sample before and after the purification is below the sensitivity of analytical methods. The purification method is much less efficient for chemically very similar radioactive elements like lanthanum, lutetium and actinium. R and D of the methods to remove the pollutions with improved efficiency is in progress.

  17. Background radiation and individual dosimetry in the costal area of Tamil Nadu, India.

    Science.gov (United States)

    Matsuda, Naoki; Brahmanandhan, G M; Yoshida, Masahiro; Takamura, Noboru; Suyama, Akihiko; Koguchi, Yasuhiro; Juto, Norimichi; Raj, Y Lenin; Winsley, Godwin; Selvasekarapandian, S

    2011-07-01

    South coast of India is known as the high-level background radiation area (HBRA) mainly due to beach sands that contain natural radionuclides as components of the mineral monazite. The rich deposit of monazite is unevenly distributed along the coastal belt of Tamil Nadu and Kerala. An HBRA site that laid in 2×7 m along the sea was found in the beach of Chinnavillai, Tamil Nadu, where the maximum ambient dose equivalent reached as high as 162.7 mSv y(-1). From the sands collected at the HBRA spot, the high-purity germanium semi-conductor detector identified six nuclides of thorium series, four nuclides of uranium series and two nuclides belonging to actinium series. The highest radioactivity observed was 43.7 Bq g(-1) of Th-228. The individual dose of five inhabitants in Chinnavillai, as measured by the radiophotoluminescence glass dosimetry system, demonstrated the average dose of 7.17 mSv y(-1) ranging from 2.79 to 14.17 mSv y(-1).

  18. Electronic structure and dynamics of ordered clusters with ME or RE ions on oxide surface

    Energy Technology Data Exchange (ETDEWEB)

    Kulagin, N.A., E-mail: nkulagin@bestnet.kharkov.u [Kharkiv National University for Radio Electronics, Avenue Shakespeare 6-48, 61045 Kharkiv (Ukraine)

    2011-03-15

    Selected data of ab initio simulation of the electronic structure and spectral properties of either cluster with ions of iron, rare earth or actinium group elements have been presented here. Appearance of doped Cr{sup +4} ions in oxides, Cu{sup +2} in HTSC, Nd{sup +2} in solids has been discussed. Analysis of experimental data for plasma created ordered structures of crystallites with size of about 10{sup -9} m on surface of separate oxides are given, too. Change in the spectroscopic properties of clusters and nano-structures on surface of strontium titanate crystals discussed shortly using the X-ray line spectroscopy experimental results. - Research highlights: External influence and variation of technology induce changes in valence of nl ions in compounds. Wave function of cluster presented as anti-symmetrical set of ions wave functions. The main equation describes the self-consistent field depending on state of all electrons of cluster. Level scheme of Cr{sup 4+} ions in octo- and tetra-site corresponds to doped oxides spectra after treatment. Plasma treatment effects in appearance of systems of unit crystallites with size of about 10{sup -6}-10{sup -9} m.

  19. A LDB e a psicologia

    Directory of Open Access Journals (Sweden)

    Oswaldo H. Yamamoto

    Full Text Available Este estudo discute as implicações para a formação acadêmica e para o exercício profissional do psicólogo, da aprovação da Lei de Diretrizes e Bases da Educação Nacional (LDB. São pontuados alguns dos pressupostos subjacentes à lei, os aspectos principais do texto legal e algumas de suas decorrências, como a regulamentação dos cursos seqüenciais e diretrizes curriculares.

  20. A Stone and a Diamond

    Institute of Scientific and Technical Information of China (English)

    司亮

    2010-01-01

    一、故事内容 After a storm, a dry river is filled with water again. Many stones fall down into the river from the hill. Most of the stones are very happy. They sing and dance together. There are two special (特别的) stones. One is black, and the other is white. The white stone is as white as snow. She is proud of herself and she looks down on all the other stones. So no one wants to play with her.

  1. A Question about a Triangle

    Science.gov (United States)

    Vinogradova, Natalya

    2016-01-01

    In fall 2013 the author taught a graduate course entitled Topics in Geometry for Middle and High School Teachers. The majority of the participants had extensive experience teaching mathematics in middle school or high school. The fact that participants were rather comfortable with the basic concepts of school geometry made it both possible and…

  2. A quackery with a difference

    DEFF Research Database (Denmark)

    Wahlberg, Ayo

    2007-01-01

    The figure of the ‘miracle cure’-peddling quack pretending spectacular properties for worthless tonics is iconic. From their 19th century traveling wagon shows to their 21st century Internet spam scams, hucksters and cranks have been consistently targeted by health authorities as a danger to publ...

  3. A Leader, Not a Hero

    Science.gov (United States)

    Rutledge, Lynda

    2005-01-01

    The author writes her experience in leading. She points out that a good leader should know when and how to let go than trying to do all the work by herself. It changed her focus on looking at details, implementation, dealing with the contractors, to leading leading people.

  4. A Whale of a Panorama

    Science.gov (United States)

    2005-01-01

    [figure removed for brevity, see original site] Click on the image for A Whale of a Panorama (QTVR) More than 1.5 years into their exploration of Mars, both of NASA's Mars Exploration Rovers continue to send a cornucopia of images to Earth. The results are so spectacular that Deputy Project Manager John Callas recently described them as 'an embarrassment of riches.' Spirit produced this image mosaic, nicknamed the 'Whale Panorama,' two-thirds of the way to the summit of 'Husband Hill,' where the rover investigated martian rocks. On the right side of the panorama is a tilted layer of rocks dubbed 'Larry's Outcrop,' one of several tilted outcrops that scientists examined in April, 2005. They used spatial information to create geologic maps showing the compass orientation and degree of tilting of rock formations in the vicinity. Such information is key to geologic fieldwork because it helps establish if rock layers have been warped since they formed. In this case, scientists have also been studying the mineral and chemical differences, which show that some rocks have been more highly altered than others. In the foreground, in the middle of the image mosaic, Spirit is shown with the scientific instruments at the end of its robotic arm positioned on a rock target known as 'Ahab.' The rover was busy collecting elemental chemistry and mineralogy data on the rock at the same time that it was taking 50 individual snapshots with its five panoramic camera filters to create this stunning view of the martian scenery. The twin tracks of the rover's all-terrain wheels are clearly visible on the left. This mosaic of images spans about 220 degrees from left to right and is an approximate true-color rendering of the Mars terrain acquired through the panoramic camera's 750-, 530-, and 430-nanometer filters. Spirit collected these images from its 497th martian day, or sol, through its 500th sol (May 27 through May 30, 2005).

  5. A112

    Directory of Open Access Journals (Sweden)

    E. Kisseleva

    2015-11-01

    Full Text Available Recruitment of mononuclear phagocytes from the blood into tissues is considered to be a crucial process during inflammatory reactions, wound healing and tumor growth. Macrophages are known to reveal high plasticity and may change under the influence of microenvironment. The aim of the study was to evaluate the changes of macrophage functional activity under the influence of Vascular endothelial growth factor (VEGF in vitro. This factor is known to be the main angiogenic factor but also possesses several immunomodulatory properties. Here we report that VEGF revealed a dose-dependent effects on cultured freshly isolated murine resident peritoneal macrophages: modulated iNOS mRNA expression, nitroxide and superoxide anion production, decreased 5′-nucleotidase (5′-N activity, but had no influence on fluid-phase pinocytosis. Moreover, VEGF increased expression of its own mRNA via autocrine pathway as well as of VEGF protein expression. VEGF also induced up-regulation of extracellular matrix protein thrombospondin-1 (TSP-1 mRNA, which is considered as a part of macrophage activation phenotype. Production of cytokines and chemokines by macrophages was screened with the help of Multi- analyte ELISArray kits. It was found that incubation of macrophages in the presence of VEGF increased the production of angiogenic cytokines – TNF-α and IL-6 as well as several monocyte and leukocyte chemoattractants such as MCP-1, RANTES and MIP-1β. Therefore, we suggest that locally established VEGF gradient may influence inflammatory phenotype of tissue macrophages as well as potentiate their pro-angiogenic properties. This work was supported by Russian Foundation for Basic Research – Russia, Grant No. 15-04-06150.

  6. A honra e a vida

    OpenAIRE

    Hentz, Isabel Cristina

    2013-01-01

    Dissertação (mestrado) - Universidade Federal de Santa Catarina, Centro de Filosofia e Ciências Humanas, Programa de Pós-Graduação em História, Florianópolis, 2013. A primeira grande legislação aprovada no período republicano, antes ainda do primeiro aniversário da República brasileira, foi o Codigo Penal dos Estados Unidos do Brazil. Publicada em 1890, substituiu o Codigo Criminal do Império do Brazil, de 1830. A aprovação do Código Penal de 1890 introduziu pela primeira vez na legislação...

  7. A violencia contra a muller

    OpenAIRE

    Rodríguez Calvo, María Sol

    2013-01-01

    Grao en Medicina Esta unidade didáctica denominada “Violencia contra a muller”, está incluída no bloque de “Clínica forense” da materia “Medicina legal”, que se imparte no segundo semestre do 5º curso do Grao en Medicina. Esta materia é froito da interrelación entre a Medicina e o Dereito nun dobre sentido: o primeiro refírese á aplicación dos coñecementos médicos para resolver cuestións xudiciais (Medicina legal propiamente dita). O segundo ocúpase da regulación xurídica da práctica médic...

  8. A Whale of A Controversy

    Institute of Scientific and Technical Information of China (English)

    2008-01-01

    Despite heavy international criticism,the Japanese refuse to end their national tradition of whale hunting When the Japanese whale-hunting fleet set sail for the Antarctic waters on November 18,the crew members must have known that their voyage would not be smooth sailing. Japan’s annual whaling program rou- tinely sets off a firestorm of protest from anti-whaling countries and organizations. In January 2006,Greenpeace’s icebreaker Arctic Sunrise collided with the Jaoanese

  9. A TYPICAL ANTIPSYCHOTIC: A REVIEW

    Directory of Open Access Journals (Sweden)

    Mukesh Ratnaparkhi

    2010-12-01

    Full Text Available Recent advances in understanding the pathophysiology of underlying psychotic disorder and subsequent development of new antipsychotic drugs to treat these diseases have altered clinicians? pharmacological approach. It has also helped researcher to produce a new generation antipsychotic agents (NGA which could show better clinical results. However methodical approach as well as in-depth research in this area has provided several potent atypical antipsychotic agents. Now days all the atypical antipsychotics agents are FDA approved and being frequently used for pharmacotherapy of schizophrenia, acute mania, bipolar mania, psychotic agitation, bipolar maintenance, and other indications. Atypical antipsychotics are associated with the numbers of clinical benefits such as higher rate of responders, efficiency in patients with refractory disease, lower risk of suicides, better functional capacity and an improved quality of life and thus, have showed their efficacy against previous modes of treatment. The present review highlights the advantages, disadvantages as well as risk factors associated with novel antipsychotic agent with a view to outline their future scope.

  10. Blood Test: Immunoglobulin A (IgA)

    Science.gov (United States)

    ... to 2-Year-Old Blood Test: Immunoglobulin A (IgA) KidsHealth > For Parents > Blood Test: Immunoglobulin A (IgA) Print A A A What's in this article? ... Questions en español Análisis de sangre: inmunoglobulina A (IgA) What It Is An IgA test measures the ...

  11. A midface swelling in a child - A possible diagnostic dilemma.

    Science.gov (United States)

    Patel, Kuntal; Oudit, Deemesh; Ross, G; Nicolson, Caroline; Howcroft, Aj

    2005-01-01

    A lump on the midface of a child can pose as a diagnostic dilemma. There is a wide variety of possible differential diagnoses, ranging from simple benign conditions such as a sebaceous cyst, dermoid cyst, lipoma, neuroma and neurofibroma, to potentially devastating conditions such as odontogenic myxoma. A case of a child in which the formulation of a definite diagnosis was clinically and histologically challenging is presented.

  12. The Northrop A-17A Nomad

    Science.gov (United States)

    1938-01-01

    The Northrop A-17A Nomad: Although another A-17 was used as a cowling testbed, this Northrop A-17A was only slightly modified during the course of its short NACA career at Langley. These modifications were done to determine the profile drag of a wing in flight.

  13. Relaparotomía a demanda. Factores asociados a mortalidad

    OpenAIRE

    José Luis Martínez-Ordaz; Roberto Manuel Suárez-Moreno; Óscar Javier Felipez-Aguilar; Roberto Blanco-Benavides

    2005-01-01

    Objetivo: revisar los factores asociados con la mortalidad de los pacientes sometidos a relaparotomía a demanda. Introducción: algunos pacientes sometidos a laparotomía son reintervenidos debido a complicaciones agudas. Pueden ser manejados de manera programada o conforme su evolución. Todavía no está determinado cuál de los dos abordajes es mejor. Material y métodos: 33 pacientes fueron relaparotomizados a demanda en un servicio de cirugía general. Resultados: en total se realizaron 51 relap...

  14. A Retirement and A Reservation: A Retrospective Autobiography

    Science.gov (United States)

    Lee, Sok K

    2012-01-01

    A retirement is a rite of passage that requires careful planning, because it forces a retiree to make a shift in the paradigm in life. For 37 years, I was a healing professional, a breadwinner, and a working spouse. I am now a jobless loner, an inactive pensioner, and a homebound spouse. In this retrospective autobiography, I suggest a few points to help my younger colleagues to better their upcoming retirement: professional, financial, social, and familial. To overcome Erikson's identity crisis, I volunteered to be a wounded healer at Warm Springs Indian Reservation. My volunteer medical service at Warm Springs Indian Reservation was a good antidote to creatively overcome my postretirement blues. PMID:22745621

  15. A.A., constructivism, and reflecting teams.

    Science.gov (United States)

    Nevels, B

    1997-12-01

    Numerous studies and clinical anecdotes reveal a relationship between attendance at A.A. meetings and/or degree of involvement in A.A. and maintenance of sobriety. Hypotheses as to how A.A. and/or the A.A. meeting is helpful to its members have ranged from a focus on factors common to all therapy groups, to aspects of A.A. "treatment" which are behavioral in nature. Presented here is another way of understanding A.A.'s effectiveness within the frame of more recent, constructivistic approaches to family therapy. In particular, the A.A. topic meeting is compared to the reflecting team concept of Tom Anderson.

  16. A method for making a hydrogen electrode

    Energy Technology Data Exchange (ETDEWEB)

    Ikeyama, M.; Ivaki, T.; Yanagikhara, N.

    1983-09-08

    A metallic grid is pressed to the surface of a foam metallic plate which contains powders of a compound which adsorb H2. The electrode is processed at the powder caking temperature. The electrode has a long service life.

  17. A Stroke Mimic: A Case Report

    Directory of Open Access Journals (Sweden)

    Annia Martínez Rivas

    2016-03-01

    Full Text Available Diseases mimicking a stroke are a major health problem for a large number of hospitals. This paper aims at presenting a disease that has a stroke-like presentation. The case of a 46-year-old man admitted to the stroke unit with a clinical and radiological diagnosis of cerebral infarction is presented. The patient developed fever and a serious deterioration of consciousness. Changes on computed tomography consistent with a brain abscess were observed. Broad-spectrum antibiotics were administered and a follow-up tomography was performed. Once the treatment was completed, the clinical and radiological suspicion of a brain abscess was confirmed.

  18. A Bíblia e a cultura

    OpenAIRE

    Gonçalves, Joaquim Cerqueira

    2005-01-01

    1. Pensar a Bíblia 2. A Bíblia e a cultura 3. Bíblia, cultura e linguagem 4. A revelação 5. O possível, o irrecusável e a Escritura 6. A Bíblia e as culturas no horizonte da ontologia 7. Jesus Cristo e a comunidade: manifestação ontológica 8. A religião cristã e as culturas

  19. Choosing a Breast Prosthesis: A Survivor's Perspective

    Science.gov (United States)

    ... Choosing a Breast Prosthesis: A Survivor’s Perspective Choosing a Breast Prosthesis: A Survivor’s Perspective Andrea Zinn June 16, 2015 · Amber ... preferences. Q: Why did you decide to wear a breast form/prosthesis rather than have a reconstruction? ...

  20. A SOLUTION OF A GENERAL EQUILIBRIUM PROBLEM

    Institute of Scientific and Technical Information of China (English)

    H.R. SAHEBI; A. RAZANI

    2013-01-01

    Under the framework of a real Hilbert space, we introduce a new iterative method for finding a common element of the set of solution of a general equilibrium problem and the set of fixed points of a nonexpansive semigroup. Moreover, a numerical example is presented. This example grantee the main result of the paper.

  1. De semelhança a semelhança

    OpenAIRE

    Didi-Huberman, Georges

    2011-01-01

    O artigo analisa a imagem e a semelhança como condições essenciais na experiência literária de Maurice Blanchot, discutindo, a partir de várias obras do escritor, as relações entre linguagem e imagem. Trabalha-se em especial a noção de "meio absoluto", invocada por Blanchot para descrever o devir-imagem da linguagem na literatura.

  2. A case of a horseshoe appendix

    OpenAIRE

    Takabatake, Kazuya; Ikeda, Jun; Furuke, Hirotaka; Kato, Chikage; Kishimoto, Takuya; Kumano, Tatsuya; Imura, Kenichiro; Shimomura, Katsumi; Kubota, Takeshi; Taniguchi, Fumihiro; Shioaki, Yasuhiro

    2016-01-01

    Anomalies of the appendix are extremely rare, and a horseshoe appendix is even rarer. A literature search has revealed only five reported cases. In this report, we present a case of a horseshoe appendix. A 78-year-old man was referred for further examination following a positive fecal occult blood test. A mass in his ascending colon was detected on colonoscopy, while computed tomography showed that it was connected to the appendix. Tumor invasion derived from the ascending colon or appendix w...

  3. A fotografia entre a loucura e a sensatez

    OpenAIRE

    Costa,Márcia Rodrigues da

    2017-01-01

    Resumo A obra dedica-se essencialmente à dialética barthesiana sobre a loucura e a sensatez da fotografia, em uma incursão pelo punctum e pelo studium. Para entender o lado profano-afetivopoético da fotografia, o autor recorre às tradições gregas. Além da relação com a mitologia, Fontanari explica a relação que Barthes traça entre a fotografia e a poesia, especificamente o haicai, que, como o puctum, evoca o silêncio e a plenitude, cessando o barulho da técnica, da realidade, em direção à ...

  4. A batuta da morte a orquestrar a vida

    Directory of Open Access Journals (Sweden)

    Altair Macedo Lahud Loureiro

    Full Text Available Com colocações de outros estudiosos da morte, teço e apresento apontamentos rápidos sobre a morte a organizar a vida. Esposo a idéia da necessidade da morte para que a vida tenha sentido nesta busca humana da completude. Endereço o olhar para uma situação especial de relação com a morte: a reação dos que ficam ao presenciar e sentir a morte de um dos seus idosos; daquele familiar, ou não, que assume o seu cuidado e acompanha o seu fim iminente; que presencia, humanamente impotente, a hora da solitária partida. Solitária morte, pois que exclusiva, própria daquele idoso do qual cuidava, do seu fim natural, por ser humano.

  5. Charging a Capacitor with a Photovoltaic Module

    Science.gov (United States)

    Aguilar, Horacio Munguía; Maldonado, Rigoberto Franco; Navarro, Luis Barba

    2017-01-01

    Charging a capacitor with a photovoltaic module is an experiment which reveals a lot about the modules characteristics. It is customary to represent these characteristics with an equivalent circuit whose elements represent its physical parameters. The behavior of a photovoltaic module is very similar to that of a single cell but the electric…

  6. W43A: a Maverick Maser Source

    Science.gov (United States)

    Diamond, P. J.; Nyman, L. Å.

    The authors report on some preliminary results from a multi-epoch monitoring project of the OH and H2O masers in the source W43A. Their results suggest that W43A is a very young stellar object which has just entered a strong stellar wind stage.

  7. A Little Area Challenge: A Sod Story

    Science.gov (United States)

    Myers, Perla L.; Pelak, Colleen N.

    2012-01-01

    As partners in a professional development project, the authors jumped at the opportunity to use a real-life problem to engage elementary and middle school teachers in a one-day exploration of the concept of area. "Length times width"--a common response to the question, "What is area?"--is a rote formulaic expression that applies only to certain…

  8. A psychological profile of a serial killer: a case report.

    Science.gov (United States)

    Dogra, T D; Leenaars, Antoon A; Chadha, R K; Manju, Mehta; Lalwani, Sanjeev; Sood, Mamta; Lester, David; Raina, Anupuma; Behera, C

    2012-01-01

    Serial killers have always fascinated society. A serial killer is typically defined as a perpetrator who murders three or more people over a period of time. Most reported cases of serial killers come from the United States and Canada. In India, there are few reported cases. We present, to the best of our knowledge, the first Indian case in the literature. The present case is of a 28-year-old man, Surinder Koli. The Department of Forensic Medicine & Toxicology, All India Institute of Medical Sciences, New Delphi handled the forensic study. We present a most unique psychological investigation into the mind of a serial killer.

  9. Scarlet Fever: A Group A Streptococcal Infection

    Science.gov (United States)

    ... this? Submit Button Past Emails CDC Features Scarlet Fever: A Group A Streptococcal Infection Language: English Español ( ... red rash that feels rough, like sandpaper. Scarlet Fever Podcast A pediatrician explains the cause, treatment, and ...

  10. A farmer becomes a social pedagogue

    DEFF Research Database (Denmark)

    Mellon, Karsten

    2016-01-01

    of the theoretical and methodological framework applied before analysing the process Amy undergoes to become a social pedagogue. The analysis demonstrates that this type of significant career change is demanding and, for Amy, filled with feelings of ambivalence and defensiveness....... for bachelor programmes. This article examines the case of a woman named Amy, a mature, nontraditional university college student who becomes a social pedagogue. Because of severe allergies, Amy had to quit her job as a farmer and began to study to become a social pedagogue. Becoming a social pedagogue...... is a tremendously complex process that involves taking on a new professional identity and acquiring new skills. In order to ascertain the extent of this complexity, this article uses a psychosocietal approach derived from a Danish/German life history research approach. This article offers a brief presentation...

  11. Estimating a living wage : a methodological review

    OpenAIRE

    Anker Richard

    2011-01-01

    Examines what should constitute a living wage. Offers a review of the concept and measurement methods used in different organizations and historically. Makes recommendations for improving the estimation of a living wage.

  12. Helping a Child Manage a Chronic Illness

    Science.gov (United States)

    ... https://medlineplus.gov/news/fullstory_160011.html Helping a Child Manage a Chronic Illness Feeling they have control over their ... News) -- Children and teens who feel confident handling a chronic illness on their own appear better able ...

  13. Having a Whale of a Time

    Science.gov (United States)

    du Feu, Chris

    2009-01-01

    A classroom practical exercise exploring the reliability of a basic capture-mark-recapture method of population estimation is described using great whale conservation as a starting point. Various teaching resources are made available.

  14. Having a Whale of a Time

    Science.gov (United States)

    du Feu, Chris

    2009-01-01

    A classroom practical exercise exploring the reliability of a basic capture-mark-recapture method of population estimation is described using great whale conservation as a starting point. Various teaching resources are made available.

  15. SIX SIGMA: A METRIC, A METHODOLOGY AND A MANAGEMENT SYSTEM

    Directory of Open Access Journals (Sweden)

    Mureşan Ioana

    2010-07-01

    Full Text Available This article is a theoretical article regarding Six Sigma. Six Sigma has been interpreted over time within quality theory as a metric, methodology or a management system. We explain Six Sigma using a logistics context: Delivery-On-Time (DOT rate problem. It is a theoretical context useful both for academic users and practitioners. At the beginning of the paper the DOT problem is generally described, while Sigma is presented according to statisticians view in the second part of the paper. Six Sigma is then presented as a metric for process’ capability. The fourth part of this article contains details regarding Six Sigma usage as a methodology for improvement, while the fifth part of this article refers to Six Sigma as a management system which can be used at firms’ level. The last chapter is dedicated to conclusions regarding the possible use of Six Sigma in Romania.

  16. A JUSTIÇA EM TERMOS HUMEANOS

    OpenAIRE

    Elcio Alcione Cordeiro

    2010-01-01

    Apresento neste breve artigo uma noção de justiça segundo o pensamento de DavidHume. A justiça humeana se posiciona totalmente em prol da ordem social, isto é, o objetivo éque a segurança na sociedade seja instaurada. Para que isso aconteça de fato, é preciso quealgumas regras desta virtude artificial venham a ser respeitada por todos os homens. Ajustificação da propriedade é uma máxima que deve ser assegurada estavelmente. Os homensestão predispostos ao egoísmo que vence a benevolência natur...

  17. A method for making a nickel electrode

    Energy Technology Data Exchange (ETDEWEB)

    Matsumoto, I.; Ikeyama, M.; Isikava, T.; Ivaki, T.; Yanashkhara, N.

    1983-07-14

    A powder of an active mass is applied to a foam metal plate and it is pressed into the pores of the base. The excess mass is removed from the surface, after which a grid structure is formed on this surface with heating of a powder of a thermally seating resin of the polyethylene type. Then, submerging the electrode plate into the resin suspension, the entire surface of the electrode is covered with a thin layer of powder of a fluorine bearing resin. The electrode has a long service life.

  18. Tiling a figure using a height in a tree

    Energy Technology Data Exchange (ETDEWEB)

    Remila, E. [Institut Universitaire de Technologie de Roanne, Paris (France)

    1996-12-31

    We first give a new presentation of an algorithm from Thurston of tiling with lozenges formed from two cells of the triangular lattice A. Secondly we extend the method to get a linear algorithm of tiling with leaning dominoes (parallelograms formed from four cells of {Lambda}) and triangles (formed from four cells of {Lambda}). Thirdly, we produce a quadratic algorithm of tiling with leaning dominoes.

  19. A new peritrichous Ciliate as a symphoriont on a Tardigrade

    NARCIS (Netherlands)

    Land, van der J.

    1964-01-01

    INTRODUCTION On 24 September 1962 a number of Tardigrada was obtained from a sample of lichens from the French Alps. The lichens had been collected Figs. 1, 2. Pyxidium tardigradum n. sp. on Hypsibius oberhaeuseri (Doy.). on 27 June 1961 from a rock in the department Haute Savoie and had been preser

  20. A new peritrichous Ciliate as a symphoriont on a Tardigrade

    NARCIS (Netherlands)

    Land, van der J.

    1964-01-01

    INTRODUCTION On 24 September 1962 a number of Tardigrada was obtained from a sample of lichens from the French Alps. The lichens had been collected Figs. 1, 2. Pyxidium tardigradum n. sp. on Hypsibius oberhaeuseri (Doy.). on 27 June 1961 from a rock in the department Haute Savoie and had been

  1. A Turing test of a timing theory.

    Science.gov (United States)

    Church, Russell M; Guilhardi, Paulo

    2005-04-29

    A quantitative theory of timing or conditioning can be evaluated with a Turing test in which the behavioral results of an experiment can be compared with the predicted results from the theory. An example is described based upon an experiment in which 12 rats were trained on three fixed-interval schedules of reinforcement, and a simulation of the predicted results from a packet theory of timing. An objective classification rule was used to determine whether a sample from the data or a sample from the theory was more similar to another sample from the theory. With an ideal theory, the expected probability of a correct classification would be 0.5. The observed probability of a correct classification was 0.6, which was slightly, but reliably, greater than 0.5. A Turing test provides a graded metric for the evaluation of a quantitative theory.

  2. A State-Run Enterprise: A Bane or a Boon?

    Directory of Open Access Journals (Sweden)

    Sungjune KIM

    2015-09-01

    Full Text Available In the less than 70 years since Korean liberation, Korea has grown to be one of the world's top five ship-owning countries in 2014. This can be attributed to a few factors such as government policy, Korea Shipping Corporation (KSC, hereafter and merchant marine officers. This paper will expound the true motivations of the establishment and the privatization of KSC in 1950 and in 1968, respectively. KSC, as Korea's national shipping company, sailed along a very unusual course of development. It was established in 1950 not to foster and develop Korea's shipping industry but to help alleviate the financial burdens of the fledgling Korean government. The main cause of privatizing KSC in 1968 was a purely political decision, not an economic one as it overlapped with the rapid growth period of the shipping industry in the world, as well as in Korea. In sum, KSC, a state-run enterprise, was a bane in the short run but a boon in the long run for both the Korean government and Korea's shipping industry. If we can believe KSC followed the ordinary sailing route as a state-run enterprise, we might develop a new opinion that the national shipping company might be a financial burden in a short period, but various benefits over a long period.

  3. A Study of Urban Education. A Report.

    Science.gov (United States)

    Illinois State School Problems Commission, Springfield.

    To obtain a clearer understanding of the problems of urban education in Illinois, a committee of seven State legislators and 14 lay citizens engaged in a three-part study: (1) A series of statewide public hearings was held, resulting in 27 proposed solutions, and five universities submitted plans for their increased participation in the…

  4. A model of a social chatbot

    NARCIS (Netherlands)

    Augello, Agnese; Gentile, Manuel; Weideveld, Lucas; Dignum, Frank

    2016-01-01

    Traditional chatbots lack the capability to correctly manage conversations according to the social context. However a dialogue is a joint activity that must consider both individual and social processes. In this work we propose a model of a social chatbot able to choose the most suitable dialogue pl

  5. [A woman with a rare vascular malformation

    NARCIS (Netherlands)

    Koning, G.G.; Vries, M. de

    2015-01-01

    A 30-year-old woman with trisomy 8 syndrome and coagulopathy was diagnosed with a malformation of the vena cava superior. This is a rare anatomical variation, which originates from a non-development of Marshall's ligament during the 8th week of gestation (prevalence: 0.3%).

  6. A model of a social chatbot

    NARCIS (Netherlands)

    Augello, Agnese; Gentile, Manuel; Weideveld, Lucas; Dignum, Frank

    2016-01-01

    Traditional chatbots lack the capability to correctly manage conversations according to the social context. However a dialogue is a joint activity that must consider both individual and social processes. In this work we propose a model of a social chatbot able to choose the most suitable dialogue

  7. A JUSTIÇA EM TERMOS HUMEANOS

    Directory of Open Access Journals (Sweden)

    Elcio Alcione Cordeiro

    2010-01-01

    Full Text Available Apresento neste breve artigo uma noção de justiça segundo o pensamento de DavidHume. A justiça humeana se posiciona totalmente em prol da ordem social, isto é, o objetivo éque a segurança na sociedade seja instaurada. Para que isso aconteça de fato, é preciso quealgumas regras desta virtude artificial venham a ser respeitada por todos os homens. Ajustificação da propriedade é uma máxima que deve ser assegurada estavelmente. Os homensestão predispostos ao egoísmo que vence a benevolência natural. A partir do momento em queos homens percebem que são egoístas e que viver em sociedade é vantajoso, acrescentam-seentão as convenções para que a ordem social seja instaurada.

  8. Remembering a Shape -- Assembling a Memory

    Science.gov (United States)

    Zeravcic, Zorana; Murugan, Arvind; Brenner, Michael; Leibler, Stanislas

    2014-03-01

    Recently we have been developing a new connection between self-assembly and neural networks, where a multi-component particle system with specified interaction rules between its components is mapped onto a multi-state Hopfield neural network model. Within this framework, a fixed interaction pattern of neurons representing a ``memory'' maps to particle interactions encoding a certain structure. Properties of neural networks motivate new types of questions: Can the interaction energies of particles code for multiple structures at the same time? Can stored structures be retrieved by throwing in a nucleation seed (i.e., a small assembly of particles) and have it complete into the desired stored structure? Can we define a capacity, i.e., a maximal number of structures that can be retrieved with limited error? We investigate these questions using numerical simulations of different types of building blocks with short-range interactions.

  9. 43 CFR Appendix A to Subpart A of... - Appendix A to Subpart A of Part 17

    Science.gov (United States)

    2010-10-01

    ... 43 Public Lands: Interior 1 2010-10-01 2010-10-01 false Appendix A to Subpart A of Part 17 A Appendix A to Subpart A of Part 17 Public Lands: Interior Office of the Secretary of the Interior... Race, Color, or National Origin Pt. 17, Subpt. A, App. A Appendix A to Subpart A of Part 17...

  10. Redefining disability: a rejoinder to a critique

    OpenAIRE

    Solveig Magnus Reindal

    2010-01-01

    Recently, scholars have argued that disability activists' redefinition of disability' as a social problem, rather than a medical problem, is maleficent, unjust, and inconsistent. It seems that the discussion on whether disability is a medical or a social category is not settled and that disability is an essentially contested concept. However, the question is: What is the social aspect in disability? It appears that there is some confusion as to what the social is in a social definition of dis...

  11. [A fetus is a person with a right to exist].

    Science.gov (United States)

    Bischofberger, E

    1989-12-27

    This article is the contribution of a Jesuit priest, a teacher of medical ethics at Uppsala, to a debate inspired by a Swedish official report "The pregnant woman and fetus--2 individuals. On fetal diagnostics. On late abortions." In a society which depends upon a structured consensus as much as Sweden does, the report has been criticized for not making clearer recommendations. The author points out that the ethical dilemmas involved are so complex that they cannot be treated from a simple either/or point of view. Fetal diagnostics, for example, serve the cause of life when the aim is to avoid abortion of a healthy fetus and make it possible to cure, even at the fetal stage, or to strengthen prospective parents' readiness to accept a handicapped child. The use of fetal diagnostic for sorting out damaged and sick fetuses, however, is selective abortion and implies a violation of the principle that all human life is of equal value. The question is no longer if one will have a child or not, but which child will one have. This collision of values has inspired so many polemic statements that it is worthwhile recalling that there is always a tension between the ethically desirable and the politically possible, The report has succeeded in formulating the ethical principles in spite of the impossibility of seeing them presented as concrete recommendations. Even so, Thomas Aquinas wrote in 13th century that one cannot always apply ethical rules to laws of society. That can lead to more evil than good.

  12. A search for a new gauge boson A'

    Energy Technology Data Exchange (ETDEWEB)

    Jensen, Eric L. [College of William and Mary, Williamsburg, VA (United States)

    2013-08-01

    In the Standard Model, gauge bosons mediate the strong, weak, and electromagnetic forces. New forces could have escaped detection only if their mediators are either heavier than order(TeV) or weakly coupled to charged matter. New vector bosons with small coupling {alpha}' arise naturally from a small kinetic mixing with the photon and have received considerable attention as an explanation of various dark matter related anomalies. Such particles can be produced in electron-nucleus fixed-target scattering and then decay to e+e-+ pairs. New light vector bosons and their associated forces are a common feature of Standard Model extensions, but existing constraints are remarkably sparse. The APEX experiment will search for a new vector boson A' with coupling α'/αfs > 6 × 10-8 to electrons in the mass range 65MeV < mass A' < 550MeV. The experiment will study e+e- production off an electron beam incident on a high-Z target in Hall A at Jefferson Lab. The e- and e+ will be detected in the High Resolution Spectrometers (HRSs). The invariant mass spectrum of the e+e- pairs will be scanned for a narrow resonance corresponding to the mass of the A'. A test run for the APEX experiment was held in the summer of 2010. Using the test run data, an A' search was performed in the mass range 175-250 MeV. The search found no evidence for an A' → e+e-reaction, and set an upper limit of {alpha}'/{alpha}{sub fs} ~ 10-6.

  13. A Project Team: a Team or Just a Group?

    OpenAIRE

    Kateřina; Daniela; Martina,

    2014-01-01

    This paper deals with issues related to work in either teams or groups. The theoretical part discusses a team and a group with regards to its definition, classification and basic distinction, brings in more on the typology of team roles, personality assessment and sociometric methods. The analytical part tests the project (work) team of a medical center represented in terms of personality and motivational types, team roles and interpersonal team relations concerning the willingness of coopera...

  14. A Project Team: A Team or Just a Group?

    OpenAIRE

    Katerina Hrazdilova Bockova; Daniela Maťovcikova

    2013-01-01

    This paper deals with issues related to work in either teams or groups. The theoretical part which discusses a team and a group with regards to its definition, classification and basic distinction brings in more on the typology of team roles, personality assessment and sociometric methods. The analytical part tests the project (work) team of a medical center represented in terms of personality and motivational types, team roles and interpersonal team relations concerning t...

  15. A visit to Absurdistan: a nightmare of a sleep specialist.

    Science.gov (United States)

    Rodenstein, Daniel; Duran Cantolla, Joaquin

    2013-12-01

    During a nocturnal dream, the authors discover a strange and unknown country, Absurdistan. Absurdistanis main concern appears to be sleep, whether nocturnal or diurnal, rather than wakefulness. They are fond of sleeping in any form, and devote much time to this activity. The authors follow a guide that shows them all kinds of strange sleep habits and keeps explaining the complex as well as the obvious. As the journey evolves, the explanations turn more and more confusing, becoming also amazingly surrealistic. The dream ends with a welcome wakefulness leaving the authors unsure of which is the waking state and which the dream.

  16. A romance with pain: a telephone perversion in a woman?

    Science.gov (United States)

    Richards, A K

    1989-01-01

    The patient repeatedly and compulsively made stereotyped telephone calls to her mother and other female protective figures. She had a history of genito-urinary infections and operations consequent to urinary retention. These symptoms were relieved gradually in the course of analysis, in which this was interpreted as a sado-masochistic perversion based on a central fantasy of phallic intrusions on the mother. The fantasy was related to turning passive viewing into active exhibitionism, actively seeking to inflict pain on herself and others in an attempt to overcome early painful medical intrusions, misplaced identification with the father, complementary relationship with the passive, compliant mother, and consequent failed identification with the oedipal mother. In the analysis, she attained a gradual reorganization of adaptive functions which allowed identification with the father through her work, reconciliation with the rivalrous siblings, and enjoyment of her female sexuality in heterosexual intercourse with the use of a fetishistic requirement that the man be uncircumcised. The hypothesis was developed that whether called a symptom or a perversion, the treatment was the same so that it was most useful to think of it as a compromise formation rather than attempting to preserve a distinction largely based on moralistic considerations.

  17. A toy model for a diatomic molecule

    Science.gov (United States)

    Hecker Denschlag, Johannes

    2016-08-01

    We introduce a toy model for a diatomic molecule which is based on coupling electronic and nuclear spins to a rigid rotor. Despite its simplicity, the model can be used scientifically to analyze and understand complex molecular hyperfine spectra. In addition, the model has educational value as a number of fundamental symmetries and conservation laws of the molecule can be studied. Because of its simple structure, the model can be readily implemented as a computer program with comparatively short computing times on the order of a few seconds.

  18. Building a Database for a Quantitative Model

    Science.gov (United States)

    Kahn, C. Joseph; Kleinhammer, Roger

    2014-01-01

    A database can greatly benefit a quantitative analysis. The defining characteristic of a quantitative risk, or reliability, model is the use of failure estimate data. Models can easily contain a thousand Basic Events, relying on hundreds of individual data sources. Obviously, entering so much data by hand will eventually lead to errors. Not so obviously entering data this way does not aid linking the Basic Events to the data sources. The best way to organize large amounts of data on a computer is with a database. But a model does not require a large, enterprise-level database with dedicated developers and administrators. A database built in Excel can be quite sufficient. A simple spreadsheet database can link every Basic Event to the individual data source selected for them. This database can also contain the manipulations appropriate for how the data is used in the model. These manipulations include stressing factors based on use and maintenance cycles, dormancy, unique failure modes, the modeling of multiple items as a single "Super component" Basic Event, and Bayesian Updating based on flight and testing experience. A simple, unique metadata field in both the model and database provides a link from any Basic Event in the model to its data source and all relevant calculations. The credibility for the entire model often rests on the credibility and traceability of the data.

  19. Geminiviruses: a tale of a plasmid becoming a virus

    Directory of Open Access Journals (Sweden)

    Krupovic Mart

    2009-05-01

    Full Text Available Abstract Background Geminiviruses (family Geminiviridae are small single-stranded (ss DNA viruses infecting plants. Their virion morphology is unique in the known viral world – two incomplete T = 1 icosahedra are joined together to form twinned particles. Geminiviruses utilize a rolling-circle mode to replicate their genomes. A limited sequence similarity between the three conserved motifs of the rolling-circle replication initiation proteins (RCR Reps of geminiviruses and plasmids of Gram-positive bacteria allowed Koonin and Ilyina to propose that geminiviruses descend from bacterial replicons. Results Phylogenetic and clustering analyses of various RCR Reps suggest that Rep proteins of geminiviruses share a most recent common ancestor with Reps encoded on plasmids of phytoplasmas, parasitic wall-less bacteria replicating both in plant and insect cells and therefore occupying a common ecological niche with geminiviruses. Capsid protein of Satellite tobacco necrosis virus was found to be the best template for homology-based structural modeling of the geminiviral capsid protein. Good stereochemical quality of the generated models indicates that the geminiviral capsid protein shares the same structural fold, the viral jelly-roll, with the vast majority of icosahedral plant-infecting ssRNA viruses. Conclusion We propose a plasmid-to-virus transition scenario, where a phytoplasmal plasmid acquired a capsid-coding gene from a plant RNA virus to give rise to the ancestor of geminiviruses.

  20. A Condition for a Translation Quiver to Be a Coil

    Institute of Scientific and Technical Information of China (English)

    Bin ZHU; Zong Yi HU

    2003-01-01

    We single out a class of translation quivers and prove combinatorially that the translationquivers in this class are coils. These coils form a class of special coils. They are easier to visualize, butstill show all the strange behaviour of general coils, and contain quasi-stable tubes as special examples.

  1. A Proposal for a Mindset of a Project Manager

    DEFF Research Database (Denmark)

    Eriksson, Joakim; Hansen, Claus Thorp

    2008-01-01

    A company’s product strategy and its management of the product development process have been found to be key factors for a product’s success on the market [1]. Project managers of development projects need support to make process decisions and defining goals that are consistent with the business’...

  2. A Pile of Legos.

    Science.gov (United States)

    DePino, Andrew, Jr.

    1994-01-01

    Describes the relationships a high school built with neighborhood industry, a national laboratory, a national museum, and a large university while trying to build a scale model of the original atomic pile. Provides suggestions for teachers. (MVL)

  3. Becoming a Vegetarian

    Science.gov (United States)

    ... A Week of Healthy Breakfasts Shyness Becoming a Vegetarian KidsHealth > For Teens > Becoming a Vegetarian A A ... en español Hacerse vegetariano Why Do People Become Vegetarians? For much of the world, vegetarianism is largely ...

  4. Broadcasting a message in a parallel computer

    Science.gov (United States)

    Berg, Jeremy E [Rochester, MN; Faraj, Ahmad A [Rochester, MN

    2011-08-02

    Methods, systems, and products are disclosed for broadcasting a message in a parallel computer. The parallel computer includes a plurality of compute nodes connected together using a data communications network. The data communications network optimized for point to point data communications and is characterized by at least two dimensions. The compute nodes are organized into at least one operational group of compute nodes for collective parallel operations of the parallel computer. One compute node of the operational group assigned to be a logical root. Broadcasting a message in a parallel computer includes: establishing a Hamiltonian path along all of the compute nodes in at least one plane of the data communications network and in the operational group; and broadcasting, by the logical root to the remaining compute nodes, the logical root's message along the established Hamiltonian path.

  5. A Reinforced Blade for a Wind Turbine

    DEFF Research Database (Denmark)

    2010-01-01

    The present invention relates to a reinforced blade for a wind turbine having elongated reinforcing members in the blade extending substantially in the plane of the profile chord in order to strengthen the blade against edgewise and flapwise forces....

  6. Life of a Tooth: A Visual Timeline

    Medline Plus

    Full Text Available ... more Orthodontics What is a Composite Resin (White Filling)? The History of Dental ... a Dentist | Your Family's Oral Health | Newsroom | RSS About AGD | Contact AGD | Site Map | ...

  7. Life of a Tooth: A Visual Timeline

    Medline Plus

    Full Text Available ... Decay? Headaches and Jaw Pain? Check Your Posture! Men: Looking for a Better Job? Start by Visiting the Dentist Why is Oral Health Important for Men? What is a Composite Resin (White Filling)? Learn ...

  8. A Novel Fortunate A from Cryptomerica fortunei

    Institute of Scientific and Technical Information of China (English)

    Zong Ping ZHENG; Li Hong HU; Jing Yu LIANG

    2005-01-01

    A novel compound, named fortunate A, was isolated from the ethanol extract of the stem bark of Cryptomerica fortunei. Its structure was established on the basis of the spectral evidences including 1D and 2D NMR spectrum.

  9. A Cultural Sexuality or a Sexual Culture?

    NARCIS (Netherlands)

    Vandermeersch, Patrick

    1990-01-01

    P. Vandermeersch, A Cultural Sexuality or a Sexual Culture? In: F. VAN DE VIJVER & G. HUTSCHEMAEKERS (ed.), The Investigation of Culture. Current Issues in Cultural Psychology, Tilburg, Tilburg University Press, 1990, 43-58.

  10. A gas jet impacting a cavity

    Science.gov (United States)

    Stiffler, A. Kent; Bakhsh, Hazoor

    1986-11-01

    A subsonic jet impinging upon a cavity is studied to explain the resultant heating phenomenon. Flow visualization within the cavity shows a large central vortex dominating the flow pattern. Velocity measurements inside the cavity are made using a hot-wire anemometer. Temperature is measured with a copper-constantan thermocouple. The velocity field within the cavity is described by a modified Rankine combined vortex. An uncommon form of the energy equation is used to account for turbulent heating in adverse pressure gradients. A theoretical solution is developed to model the temperature field in the cavity. There is a good agreement between the calculated and measured temperatures. The heating effect is related to Ranque-Hilsch tubes.

  11. Entomology: A Bee Farming a Fungus.

    Science.gov (United States)

    Oldroyd, Benjamin P; Aanen, Duur K

    2015-11-16

    Farming is done not only by humans, but also by some ant, beetle and termite species. With the discovery of a stingless bee farming a fungus that provides benefits to its larvae, bees can be added to this list.

  12. Founding a Foundation: A Mini Case Study.

    Science.gov (United States)

    Lake, Dale B.

    1981-01-01

    Lists factors contributing to the need for increased fund raising in community colleges. Discusses advantages of a foundation as a means of obtaining private funds. Delineates specifics of establishing, organizing, and implementing the Kalamazoo Valley Community College Foundation. (DMM)

  13. A microcontroller system of a biotelemetric

    Directory of Open Access Journals (Sweden)

    O. B. Sharpan

    2007-10-01

    Full Text Available The system of a short-range biotelemetry is circumscribed which records and transmits biosignals to distance in tens meters. The system is intended for work in a composition of the pulse cardiologic analyzer.

  14. A. A. Laanessaare luule / Ruth Mirov

    Index Scriptorium Estoniae

    Mirov, Ruth, 1928-

    1996-01-01

    Ilmunud ka kogumikus: Mirov, Ruth. Sõnast sõnasse : valik artikleid ja retsensioone. Tallinn ; Tartu : Eesti Keele Sihtasutus, 2002, lk. 200-230. August Annisti luulest, avaldatud A. A. Laanessaare varjunime all

  15. A method for making a storage cell

    Energy Technology Data Exchange (ETDEWEB)

    Tanakhasi, K.; Ivaki, T.

    1983-03-17

    The electrode unit is placed in a tank and water is poured into it until the electrodes are completely submerged. A liquid is poured in from above which is a solution of a synthetic resin of the polyvinylchloride type in a solvent insoluble in water of the tetrahydrofurane type. The solvent spreads along the surface of the water. The resin is removed, hardening and forming a porous layer on the wave shaped coagulated flakes. Then the liquid is poured off, passing through the pores of the resin layer. The water is replaced by an electrolyte. The layer of resin prevent splashing and excess evaporation of the electrolyte. A plug with a catalyst for recombining the gases formed in the storage device may be installed additionally in the storage device.

  16. A method for making a dry element

    Energy Technology Data Exchange (ETDEWEB)

    Abe, T.; Isikhara, K.; Kimura, T.; Momose, K.; Sakata, Y.

    1983-08-11

    The agglomerate is coated along the lateral surface by a separator and is enclosed in a zinc cylinder which serves as the anode. A separating plate is installed in the upper part of the agglomerate between the agglomerate and the anode. A current outlead is attached to the anode. The element is inserted into a body, pressing the plate into the agglomerate with a punch which has a recess. A guide cylinder is used for precise installation of the element. The space between the plate and the body in the upper part of the element is filled with wax or another substance. Short circuiting (KZ) between the current outlead and the agglomerate is prevented in the element.

  17. A Project Team: a Team or Just a Group?

    Directory of Open Access Journals (Sweden)

    Kateřina

    2014-06-01

    Full Text Available This paper deals with issues related to work in either teams or groups. The theoretical part discusses a team and a group with regards to its definition, classification and basic distinction, brings in more on the typology of team roles, personality assessment and sociometric methods. The analytical part tests the project (work team of a medical center represented in terms of personality and motivational types, team roles and interpersonal team relations concerning the willingness of cooperation and communication. The main objective of this work is to verify the validity of the assumptions that the analyzed team represents a very disparate group as for its composition from the perspective of personality types, types of motivation, team roles and interpersonal relations in terms of the willingness of cooperation and communication. A separate output shall focus on sociometric investigation of those team members where willingness to work together and communicate is based on the authors’ assumption of tight interdependence.

  18. Giuseppe Moscati: a man, a physician and a scientist.

    Science.gov (United States)

    Ponti, Giovanni; D'Onofrio, Felice; Ruini, Cristel; Muscatello, Umberto; Tomasi, Aldo

    2015-01-01

    The life of Giuseppe Moscati (1880-1927) as a man, as a physician and as a scientist may be framed within the cultural climate of Positivism, which spread over the last years of the 19th century and the beginning of the 20th Century. His activity contributed to patients' care improvement; in addition to meticulous drug regimens, he also prescribed a methodology of spiritual care, involving meditation and self-control as part of an holistic approach to healthcare. Our review deals with his published researches, highlighting the innovative findings on the juvenile diabetes treatment and extensive clinical changes consequent upon nephritis. This extraordinary man put considerable emphasis on primary care and holistic health in Italy, pioneering a new patient-centred, and holistic approach to medicine.

  19. Generalizing a study of a rotating rod carrying a collar

    Energy Technology Data Exchange (ETDEWEB)

    Campos, I [Departamento de Fisica, Facultad de Ciencias, universidad Nacional Autonoma de Mexico, Apartado Postal 21-939, Mexico 04000 D.F. (Mexico); Del Valle, G; Hernandez, M G [Area de Fisica, Division de Ciencias Basicas e IngenierIa, Universidad Autonoma Metropolitana-Azcapotzalco, Apartado Postal 21-939, Mexico 04000 D.F. (Mexico); Jimenez, J L, E-mail: jlj@xanum.uam.m [Departamento de Fisica, Division de Ciencias Basicas e IngenierIa, Universidad Autonoma Metropolitana-Iztapalapa, Apartado Postal 21-939, Mexico 04000 D.F. (Mexico)

    2010-11-15

    The present work is a generalization of the work of Ribberfors and Reitz (2000 Eur. J. Phys. 21 151-7). These authors study a system consisting of a collar that is restricted to move in a path defined by a rod of some prescribed form which passes through the collar. We generalize the analysis of this system by means of canonical treatment. We show in this way that this excellent example can also be used in advanced courses on mechanics to show the power of the methods of analytical mechanics. We have that the present treatment of this example will be useful for advanced undergraduate and graduate students as well as for the teachers of these courses on classical mechanics. (letters and comments)

  20. A person in a closed environment as a psychological problem

    Directory of Open Access Journals (Sweden)

    YuliyaV. Klochko

    2013-12-01

    Full Text Available This article addresses an ethically weighted problem which is related to modern psychology: when a person lives in a closed environment. A new approach to solving this problem is being examined. It is based on the finding of substantial new functional aspects of the cognitive processes of making and losing meaning. The study of this sub-discipline started with O.K. Tikhomirov’s theory of thinking. The phenomenon of “adaptability to changes in lifestyle” is being analyzed. The substantial characteristics of the notion of a “closed environment” as well as the psychological manifestations which appear when one is forced to live in a closed environment or choses to live in one of his or her own volition are being revealed. According to the author, the new approach will allow us to come closer to understanding and being able to explain the psychological mechanisms of the mental upheaval which prisoners in solitary confinement experience.

  1. A Burger, a Beer, and a Side of Science

    Science.gov (United States)

    Wiehe, B. R.; Landsberg, R. H.; Wyatt, R. J.; Turner, M. S.

    2008-11-01

    Science cafés (a.k.a. café scientifiques) engage unconventional adult audiences and help researchers hone their communication skills in a relaxed and fun setting. Typically held in restaurants and pubs, science cafés provide a comfortable place for the public to speak with a scientist. National and local evaluations of the café format indicate that café are an effective way to engage adult audiences (especially non-scientists). Continued media coverage also demonstrates that something about them captures the public's imagination. This paper is based on an interactive oral presentation about organizing, presenting, and partnering with science café to bring IYA themes (and other current research) directly to new audiences. Real world examples from experienced café organizers and presenters provide an overview of what a science café is, how to start one, and how to use the format to draw attention to astronomy topics. The discussion includes suggestions for tapping into the existing national and international community of cafés (there are more than 60 in the U.S. alone), and information about free outreach resources. Break-out exercises in the original oral presentation were designed to help prepare participants to: find a suitable venue, advertise, work with café speakers, and foster the inclusive conversation that is the hallmark of a science café. Participants also learned about the impacts that can be expected from a science café, including benefits to audiences, café presenters, and hosting organizations. The overall goal of the original oral presentation was to stimulate a discussion about strategies for facilitating face-to-face communication between scientists and lay audiences.

  2. A Spinning Particle in a Mobius Strip

    CERN Document Server

    Nieto, J A

    2011-01-01

    We develop the classical and quantum theory of a spinning particle moving in a Mobius strip. We first propose a Lagrangian for such a system and then we proceed to quantize the system via the constraint Hamiltonian system formalism. Our results may be of particular interest in several physical scenarios, including solid state physics and optics. In fact, the present work may shed some new light on the recent discoveries on condensed matter concerning topological insulators.

  3. Ankylosing Spondylitis: a Reflection and a Question

    Directory of Open Access Journals (Sweden)

    Annia Deysi Hernández Martín

    2014-07-01

    Full Text Available Ankylosing spondylitis is a chronic inflammatory disease that affects the synovial membrane, joint entheses and para-articular structures of the spine, including the sacroiliac joints and limbs. We present a case of ankylosing spondylitis that had evolved for 12 years despite the relatively early diagnosis and treatment, showing flexion deformity and limitation of spinal movements. On radiological examination an early evolution to ankylosis was observed, which motivated us to make a reflection and a question.

  4. Transforming a foundation into a cooperative

    Directory of Open Access Journals (Sweden)

    Juan Ramón Manzano Malaxechevarría

    2013-12-01

    Full Text Available The author charts a path between entities that meet needs in the general interest such as foundations and others which are neither entities of general interest nor have purely mercantile legal personality such as cooperatives. Transforming a foundation into a cooperative calls for a broad interpretation of the principle of free will that the legislation wishes to foster.Received: 12.02.2013Accepted: 20.04.2013

  5. Aprendiendo a leer y a escuchar

    Directory of Open Access Journals (Sweden)

    Juan Carlos Rodríguez

    2010-12-01

    Full Text Available Cuando Discépolo llegó al tango, el tango estaba ya hecho.Había pasado de su época legendaria a su época mítica. El tango se había convertido en mito. Y el mito tiene un problema básico. Pierde su contacto con la realidad para transmutarse a sí mismo en la expresión de esa realidad.

  6. A Reinforced Blade for a Wind Turbine

    DEFF Research Database (Denmark)

    2010-01-01

    The present invention relates to a reinforced blade for a wind turbine having elongated reinforcing members in the blade extending substantially in the plane of the profile chord in order to strengthen the blade against edgewise and flapwise forces.......The present invention relates to a reinforced blade for a wind turbine having elongated reinforcing members in the blade extending substantially in the plane of the profile chord in order to strengthen the blade against edgewise and flapwise forces....

  7. Becoming a schoolchild - a positive developmental crisis

    DEFF Research Database (Denmark)

    Winther-Lindqvist, Ditte Alexandra

    2017-01-01

    a schoolchild should be viewed as a positive developmental crisis. It is argued that institutional transitions are both characterized by preparation (institutionally and personally) and of actualization. A general descriptive model of identity tasks and developmental demands is offered to account...

  8. [A woman with a special cervix].

    NARCIS (Netherlands)

    Hamont, D. van; Bekkers, R.L.M.; Struik-van der Zanden, P.H.

    2011-01-01

    A 40-year-old woman (nulligravida) presented with abnormal cervical cytology. At colposcopy a double external uterine os was discovered with a levonorgestrel intra uterine contraceptive device placed in the opening on the left side. Ultrasound revealed an uterus bicornis bicollis. Despite frequent

  9. Sustainable Competence: A Study of a Bank

    Science.gov (United States)

    Hagstrom, Tom; Backstrom, Tomas; Goransson, Susanna

    2009-01-01

    Purpose: Decentralization and company cultures have emerged to master increasing external flexibility, as in a competitive bank in Sweden, raising issues of the sustainability in terms of competence and competence development. The purpose of this paper is to study how the staff members in a bank perceive a company culture and how this perception…

  10. A Method of Operating a Fuel Cell

    DEFF Research Database (Denmark)

    2013-01-01

    The present invention relates to a method of determining the net water drag coefficient (rd) in a fuel cell. By measuring the velocity of the fluid stream at the outlet of the anode, rd can be determined. Real time monitoring and adjustments of the water balance of a fuel cell may be therefore...

  11. A Method of Operating a Fuel Cell

    DEFF Research Database (Denmark)

    2013-01-01

    The present invention relates to a method of determining the net water drag coefficient (rd) in a fuel cell. By measuring the velocity of the fluid stream at the outlet of the anode, rd can be determined. Real time monitoring and adjustments of the water balance of a fuel cell may be therefore...

  12. When a regulation becomes a learning process

    DEFF Research Database (Denmark)

    Nunez, Heilyn Camacho; Cespedes, Paula

    Adoption and effective use of information and communication technology (ICT) becomes a need for organizations of any size and type, however, ICT adoption is still a challenge for organizations, its implementation must be a strategic decision that involves design, delivery and use of software syst...

  13. A Lonely Heart Could Worsen a Cold

    Science.gov (United States)

    ... page: https://medlineplus.gov/news/fullstory_164381.html A Lonely Heart Could Worsen a Cold People who feel isolated tend to have ... 30, 2017 THURSDAY, March 30, 2017 (HealthDay News) -- A cold is never fun, but it's even more ...

  14. A microfluidic device with a diffusion barrier

    DEFF Research Database (Denmark)

    2014-01-01

    The invention provides a microfiuidic device for macromoiecuie amplification by sequential addition of liquid reagents. The device of the invention comprises a chip forming a plurality of reaction chambers each extending between an inlet and an outlet, each inlet being in fluid communication with...

  15. Stabilizing a Bicycle: A Modeling Project

    Science.gov (United States)

    Pennings, Timothy J.; Williams, Blair R.

    2010-01-01

    This article is a project that takes students through the process of forming a mathematical model of bicycle dynamics. Beginning with basic ideas from Newtonian mechanics (forces and torques), students use techniques from calculus and differential equations to develop the equations of rotational motion for a bicycle-rider system as it tips from…

  16. What a Time to Be a Bunny

    Institute of Scientific and Technical Information of China (English)

    NATHAN; BEARDSLEY

    2011-01-01

    It is the dead of the night and the city is sleeping. A stray car cruises the street until its lonesome passenger responds in a zombie-like manner to a traffic light that turns red, stopping an invisible flow of traffic.

  17. A minimal model of a tidewater glacier

    NARCIS (Netherlands)

    Oerlemans, J.; Nick, Faezeh Maghami

    2005-01-01

    We propose a simple, highly parameterized model of a tidewater glacier. The mean ice thickness and the ice thickness at the glacier front are parameterized in terms of glacier length and, when the glacier is calving, water depth. We use a linear relation between calving rate and water depth. The

  18. A Model Technology Educator: Thomas A. Edison

    Science.gov (United States)

    Pretzer, William S.; Rogers, George E.; Bush, Jeffery

    2007-01-01

    Reflecting back over a century ago to the small village of Menlo Park, New Jersey provides insight into a remarkable visionary and an exceptional role model for today's problem-solving and design-focused technology educator: Thomas A. Edison, inventor, innovator, and model technology educator. Since Edison could not simply apply existing knowledge…

  19. SecA, a remarkable nanomachine

    NARCIS (Netherlands)

    Kusters, Ilja; Driessen, Arnold J. M.

    2011-01-01

    Biological cells harbor a variety of molecular machines that carry out mechanical work at the nanoscale. One of these nanomachines is the bacterial motor protein SecA which translocates secretory proteins through the protein-conducting membrane channel SecYEG. SecA converts chemically stored energy

  20. A minimal model of a tidewater glacier

    NARCIS (Netherlands)

    Oerlemans, J.; Nick, Faezeh Maghami

    2005-01-01

    We propose a simple, highly parameterized model of a tidewater glacier. The mean ice thickness and the ice thickness at the glacier front are parameterized in terms of glacier length and, when the glacier is calving, water depth. We use a linear relation between calving rate and water depth. The cha

  1. Death ends a life not a relationship

    DEFF Research Database (Denmark)

    Christensen, Dorthe Refslund; Sandvik, Kjetil

    2015-01-01

    When parents are expecting, the child is usually awaited with hope and plans and reflections on how to share the life and future with this new child. As such the child opens the parents' perspective to a new future, a span of time or potentiality, a certain narrative—that is, being parents, raisi...

  2. Are You a Man or a Mouse?

    DEFF Research Database (Denmark)

    Herrmann, Janne Rothmar

    2008-01-01

    Are you a man or a mouse? This expression is used to encourage someone to be brave when they are frightened of doing something. It is also an expression which bears associations to John Steinbeck's novella Of Mice and Men, the title of which is taken from Robert Burns' poem To a Mouse, which is o...

  3. A modified total synthesis of cystothiazole A

    Institute of Scientific and Technical Information of China (English)

    2009-01-01

    A modified total synthesis of cystothiazole A is described. In this synthetic strategy, a one-step transformation of acylated oxazolidinone to β-ketoester has been successfully applied, thus making the synthetic route more efficient. This method may also be potentially applied in synthesis of other related β-substituted-β-methoxyl acrylates (bb-MOAs).

  4. A modified total synthesis of cystothiazole A

    Institute of Scientific and Technical Information of China (English)

    BAI YueXia; BAO JiLai; REN Jun; WANG ZhongWen

    2009-01-01

    A modified total synthesis of cystothiazole A is described.In this synthetic strategy,a one-step transformation of acylated oxazolidinone to β-ketoester has been successfully applied,thus making the synthetic route more efficient.This method may also be potentially applied in synthesis of other related β-substituted-β-methoxyl acrylates (bb-MOAs).

  5. Sustainable Competence: A Study of a Bank

    Science.gov (United States)

    Hagstrom, Tom; Backstrom, Tomas; Goransson, Susanna

    2009-01-01

    Purpose: Decentralization and company cultures have emerged to master increasing external flexibility, as in a competitive bank in Sweden, raising issues of the sustainability in terms of competence and competence development. The purpose of this paper is to study how the staff members in a bank perceive a company culture and how this perception…

  6. A device for reforming a hydrocarbon fuel

    Energy Technology Data Exchange (ETDEWEB)

    Kendzi, T.; Ikuo, M.

    1984-03-15

    In order to utilize the heat from the reaction of reforming of a hydrocarbon fuel and the heat scattered from a heater, a design is proposed for a fuel reforming reactor in which the gases entering the reactor first pass inside the reactor along the external wall and are heated by the heat dispersed inside the reactor. Then they go in the opposite direction along a clearance between the interior shell of the reactor and the internal body of the reactor itself with a catalyst (Kt) and a heated electrical cylindrical heater. Then the gases, already heated, go directly into the cavity of the reactor filled with the catalyst where the reforming reaction occurs and then the gases and the vapors of the reformed fuel are discharged, passing through a system of heat exchangers. The layout of such a reactor, which contains a cylindrical shell inside, a cylindrical sleeve coaxial with it and the body of the reactor itself with the heater, is given. A system for attaching the internal sleeve and the body of the reactor to the catalyst is cited. The course of the gases inside the reactor is also given.

  7. A lattice for a lead storage battery

    Energy Technology Data Exchange (ETDEWEB)

    Fukuda, S.; Fukunaga, K.; Kumano, Y.

    1983-07-13

    Lattices for a lead storage cell are made of a lead alloy which contains (in percent by mass): 0.05 to 0.3 strontium; 0.02 to 0.1 aluminum; 0.05 to 3.0 tin and 0.01 to 3.0 cadmium. The storage cell has low autodischarge and a long service life.

  8. Teratogenia da vitamina A Vitamin A teratogenicity

    Directory of Open Access Journals (Sweden)

    Maria Helena de Castro Chagas

    2003-09-01

    Full Text Available A vitamina A é essencial à preservação e ao funcionamento normal dos tecidos, assim como, ao crescimento e desenvolvimento. No humano há evidência indireta que a vitamina A em excesso, durante as primeiras semanas de gestação é teratogênica. Do contrário, não há dúvidas sobre os efeitos deletérios, de uma alimentação carente neste micronutriente e sobre a disponibilidade do conhecimento técnico para evitá-los. A preocupação com o fato de que a vitamina A conduziria a teratogenia em humanos, tem retardado a implementação de programas de combate a carência de vitamina A, atingindo principalmente os programas de enriquecimento de alimentos. A literatura é controvertida e dispõe de poucas informações sobre as doses para suplementação de gestantes. Como o retinol circulante materno é controlado homeostaticamente após o consumo de alimentos fonte de vitamina A, espera-se a mesma resposta metabólica após o consumo de alimentos fortificados, indicando que não há risco de teratogenia. Consequentemente, parece altamente improvável que o consumo de alimentos enriquecidos ou de suplementos de vitamina A pré-formada, nas doses unitárias habituais, tenha efeito teratogênico no homem.The vitamin A is essential to the preservation and the normal functioning of tissues, as well as, to the growth and development. In the human being it has indirect evidence that the vitamin A in excess, during the first weeks of gestation is teratogenic. Of the opposite, it does not have doubts on the deleterious effect, of a devoid feeding in this micronutrient and on the availability of the knowledge technician to prevent them. The concern with the fact of that the vitamin A would lead it the teratogenicity in human beings, has delayed the implementation of combat programs the vitamin A lack, mainly reaching the programs of food enrichment. Literature is controverted and makes use of few information on the doses for supplementation of

  9. A diferença e a alteridade

    Directory of Open Access Journals (Sweden)

    Eurídice Figueiredo

    2007-12-01

    Full Text Available Este texto se propõe a discutir o pensamento diferencialista da crítica e da literatura norte-americanas presente no tratamento da alteridade em relação às representações dos mestiços e a mostrar que ele é diferente da lógica universalista brasileira. Muito se falou da ideologia do branqueamento no Brasil, que possibilita a passagem de uma cor/raça a outra, considerada superior. Este fenômeno, chamado de passing em inglês, em que os mulatos/mestiços claros podem ocultar sua origem, mudar de região e se fazer passar por brancos, também existe na América do Norte. Este tema – que aparece em vários romances – é altamente problemático nos dias de hoje, em que as minorias são instadas, pelo pensamento politicamente correto, a se assumir e lutar pelo direito à diferença. Esta visão nega ao personagem do mestiço-quase-branco o direito à singularidade e à construção de uma identidade individual(ista, já que ele deve se inserir sempre no âmbito de uma luta coletiva.

  10. A PURCHASING DECISION: SELECTING A SUPPLIER FOR A CONSTRUCTION COMPANY

    Institute of Scientific and Technical Information of China (English)

    Ozden BAYAZIT; Birsen KARPAK; Ayhan YAGCI

    2006-01-01

    Supplier selection is one of the most crucial activities performed by organizations because of its strategic importance. Supplier selection is a multi-objective problem involving both quantitative and qualitative criteria. Over the years a number of quantitative approaches have been tried. Although the Analytic Hierarchy Process (AHP) has previously been used in supplier selection problems, one major weakness of the application-oriented AHP literature is that it tends to focus on the mechanics of AHP instead of on the theoretical and practical implications associated with finding a solution. Though it is one of the most extensively used Multiple Criteria Decision Analysis methodologies, our literature search indicated that most studies found the best solution and stopped there, ignoring sensitivity analysis. Performing sensitivity analysis is very important for practical decision making, sometimes even as important as finding the best solution. In this paper for the first time a comprehensive application of AHP for a real-world case is presented along with sensitivity analysis in choosing the best suppliers for a Turkish construction company. As a result of this study the company decided to allocate the order quantities between the two top suppliers.

  11. A Psychological Factor Affecting a Cardiac Condition in a Psychotherapist

    Directory of Open Access Journals (Sweden)

    R Waxman

    2009-03-01

    Full Text Available It has been established that intense emotions can affect the development and course of cardiac arrhythmias. This study sought to convey that a lack of expression of emotion can also have an effect on arrhythmias. A psychotherapist with Idiopathic Ventricular Fibrillation and an Implantable Cardioverter Defibrillator measured his rate of Premature Ventricular Contractions using a Holter monitor during three separate six-week periods and in three domains: A work days vs. off days, B a 27 hour work week vs. 22 hour work week, and C in 5 different modalities including 1 Meeting with department head 2 Individual psychotherapy with patients 3 Group therapy with patients 4 Supervision of residents 5 Personal psychoanalysis. The results showed more than a 3-fold increase of arrhythmogenic activity during the 27-hour work week vs. 22 and a 5-fold increase in arrhythmogenic activity on work days compared to days off. Department Head meetings were found to be most arrhythmogenic and personal psychoanalysis was least. The data suggest that the psychiatrist’s lack of emotional expression in his clinical work has been demonstrated to markedly worsen his arrhythmia. The results also point to the potential ameliorating effects of the therapist’s own psychotherapy.

  12. Eurasian Union: A Utopia, a Dream or a Coming Reality?

    Directory of Open Access Journals (Sweden)

    Tuğçe Varol SEVIM

    2013-11-01

    Full Text Available Twenty years passed after the dissolution of the USSR and the re-birth of Russian Federation and Central Asian states in the world arena in such a unipolar world. Since the rise of Vladimir Putin to power Russia resists on unipolar system and sees that as a treat to its security. Hence, Kremlin perceives that the economic strength is the sine qua non for the future of Russia in order to sustain a Big Power status not only in its region but also in the world. In 2011, Russia, Belarus and Kazakhstan have achieved to form a Customs Union among them and invited all the states in the region to join the organization. There were thesis which mainly argued that Russia would no longer be a “power” in the Central Asia and could only be a regional power just in case of maintaining of its own unity. However, the circumstances have changed in the region accordingly Russian weight as a result of the new conjuncture. In 2012, Russia had a new presidential election and Putin returned to Kremlin as President himself. It has been understood from his words that Kremlin's new strategy to be focused on creating a Eurasian Union including Kyrgyzstan and Tajikistan at the first stage. It is aimed to analyze in this study that whether this project could be successful and if so, what could be the impacts on world order in terms of competition between Russia, the United States and China also. And finally, what could be the result of such an organization for the Russia.

  13. Josephine Baker: A Chanteuse and a Fighter

    Directory of Open Access Journals (Sweden)

    Konomi Ara

    2010-03-01

    Full Text Available This excerpt is from her newly-published biography of Josephine Baker, “A Fighting Diva.” It tells the intriguing story of Baker’s travels to Japan, her close friendship with the Japanese humanitarian Miki Sawada, and her adoption of a pair of Japanese orphans. Even after she achieved celebrity in France, Baker’s experience as a Black American led her to develop an antiracist philosophy at a worldwide level, and she combined political militancy in the public sphere with a personal commitment through the formation of an international multiracial household of children, the “Rainbow Tribe.”

  14. Josephine Baker: A Chanteuse and a Fighter

    Directory of Open Access Journals (Sweden)

    Konomi Ara

    2010-03-01

    Full Text Available

    This excerpt is from her newly-published biography of Josephine Baker, “A Fighting Diva.” It tells the intriguing story of Baker’s travels to Japan, her close friendship with the Japanese humanitarian Miki Sawada, and her adoption of a pair of Japanese orphans. Even after she achieved celebrity in France, Baker’s experience as a Black American led her to develop an antiracist philosophy at a worldwide level, and she combined political militancy in the public sphere with a personal commitment through the formation of an international multiracial household of children, the “Rainbow Tribe.”

  15. Homenagem a Ecléa Bosi

    Directory of Open Access Journals (Sweden)

    Marilena Chauí

    2008-03-01

    Full Text Available Neste ensaio, buscamos a principal contribuição de Ecléa Bosi para a Psicologia Social, qual seja, a relação entre teoria, método e técnicas de pesquisa e militância social, política e cultural, a partir da definição da psicologia como fenomenologia dos atos expressivos e da relação de amizade entre o pesquisador e o pesquisado como pessoa.

  16. A study of a simple gyrotron equation

    Energy Technology Data Exchange (ETDEWEB)

    Goetz, Markus [Max-Planck-Institut fuer Plasmaphysik, EURATOM-Association, D-85748 Garching (Germany); Meyer-Spasche, Rita [Max-Planck-Institut fuer Plasmaphysik, EURATOM-Association, D-85748 Garching (Germany); Weitzner, Harold [New York University, Courant Institute of Mathematical Sciences, New York, NY 10012 (United States)

    2007-03-02

    A simple standard equation for the evolution of the electrons and electromagnetic fields in a gyrotron cavity is studied. A number of mathematical properties are shown: existence and uniqueness of solutions for a limited axial extent and existence and uniqueness for all axial lengths in one case of particular interest. A Poynting theorem is obtained directly from the model and the Hamiltonian character of the electron motion is demonstrated. The start-up and final state in the gyrotron cavity are also examined. The efficiency of energy flux transfer from the electron beam to the wave is estimated.

  17. Comparing a Linguistic and a Stochastic Tagger

    CERN Document Server

    Samuelsson, C; Samuelsson, Christer; Voutilainen, Atro

    1997-01-01

    Concerning different approaches to automatic PoS tagging: EngCG-2, a constraint-based morphological tagger, is compared in a double-blind test with a state-of-the-art statistical tagger on a common disambiguation task using a common tag set. The experiments show that for the same amount of remaining ambiguity, the error rate of the statistical tagger is one order of magnitude greater than that of the rule-based one. The two related issues of priming effects compromising the results and disagreement between human annotators are also addressed.

  18. A child with a large bladder stone: A case report

    Directory of Open Access Journals (Sweden)

    Hulya Ozturk

    2014-07-01

    Full Text Available Bladder stones account for approximately 5% of all urinary system stones and are prevalent among children living in poor or rural regions. The symptoms and findings in children with bladder stones are usually urgency, frequency, incontinence, dysuria, pyuria, difficulty voiding, and fever, small caliber of urinary stream, lower abdominal pain and urinary intermittency. Most bladder stones are composed of calcium oxalate, followed by calcium phosphate, and they are usually larger than 2.5 cm in diameter. We present a case of a larger-than 2.5-cm bladder stone in a child.

  19. A Spectrum is Worth a Thousand Pictures

    Science.gov (United States)

    Gelderman, Richard F.

    2006-12-01

    A wise astronomer once pointed out that if a picture is worth a thousand words, then a spectrum is worth a thousand pictures. Unfortunately, spectra are rarely emphasized in the introductory astronomy courses and few students exit such a course with any meaningful understanding or appreciation of spectroscopy. Part of the problem is lack of background knowledge; the typical introductory astronomy student has little experience with spectroscopy or atomic physics. Another issue is that spectra are not pretty pictures and are not intuitively understandable. We present and discuss a series of “minds-on” exercises and activities built into a college-level “stars, galaxies, and cosmology” intro astronomy course. The lessons are structured to help students improve their ability to recognize patterns and improve their ability to really see the details in front of them. Another goal is for students to realize there is “more than meets the eye” to learn how to discover “hidden” diagnostics, such as different sources of light their eyes see as white light. A curriculum that emphasizes spectroscopy also provides the opportunity to stress the story of the “Harvard Women,” a tale that bridges gender gaps and often humanizes scientists in the eyes of non-science majors. Finally, with a solid foundation in spectroscopy, students are better prepared to understand exciting topics such as Hubble’s Law and the importance of primordial nucleosynthesis.

  20. A case of a horseshoe appendix.

    Science.gov (United States)

    Takabatake, Kazuya; Ikeda, Jun; Furuke, Hirotaka; Kato, Chikage; Kishimoto, Takuya; Kumano, Tatsuya; Imura, Kenichiro; Shimomura, Katsumi; Kubota, Takeshi; Taniguchi, Fumihiro; Shioaki, Yasuhiro

    2016-12-01

    Anomalies of the appendix are extremely rare, and a horseshoe appendix is even rarer. A literature search has revealed only five reported cases. In this report, we present a case of a horseshoe appendix.A 78-year-old man was referred for further examination following a positive fecal occult blood test. A mass in his ascending colon was detected on colonoscopy, while computed tomography showed that it was connected to the appendix. Tumor invasion derived from the ascending colon or appendix was suspected. We diagnosed ascending colon cancer prior to laparoscopic ileocecal resection. Macroscopic findings showed that the appendix connected to the back side of the mass, while microscopic findings showed that the mucosa and submucosa were continuous from the appendiceal orifice in the cecum to the other orifice in the ascending colon, where a type 1 tumor was observed on the orifice. We eventually diagnosed the patient with tubulovillous adenoma and a horseshoe appendix.A horseshoe appendix communicates with the colon at both ends and is supplied by a single fan-shaped mesentery. Cases are classified by the disposal of the mesentery and the location of the orifice. Anatomical anomalies should be considered despite the rarity of horseshoe appendices.

  1. A muon collider as a Higgs factory

    CERN Document Server

    Neuffer, D; Alexahin, Y; Ankenbrandt, C; Delahaye, J P

    2015-01-01

    Because muons connect directly to a standard-model Higgs particle in s-channel production, a muon collider would be an ideal device for precision measurement of the mass and width of a Higgs-like particle, and for further exploration of its production and decay properties. Parameters of a high-precision muon collider are presented and the necessary components and performance are described. An important advantage of the muon collider approach is that the spin precession of the muons will enable energy measurements at extremely high accuracy (dE/E to 10-6 or better). The collider could be a first step toward a high-luminosity multi-TeV lepton collider, and extensions toward a higher-energy higher-luminosity device are also discussed.

  2. A Random Laser as a Dynamical Network

    CERN Document Server

    Höfner, M; Henneberger, F

    2013-01-01

    The mode dynamics of a random laser is investigated in experiment and theory. The laser consists of a ZnCdO/ZnO multiple quantum well with air-holes that provide the necessary feedback. Time-resolved measurements reveal multimode spectra with individually developing features but no variation from shot to shot. These findings are qualitatively reproduced with a model that exploits the specifics of a dilute system of weak scatterers and can be interpreted in terms of a lasing network. Introducing the phase-sensitive node coherence reveals new aspects of the self-organization of the laser field. Lasing is carried by connected links between a subset of scatterers, the fields on which are oscillating coherently in phase. In addition, perturbing feedback with possibly unfitting phases from frustrated other scatterers is suppressed by destructive superposition. We believe that our findings are representative at least for weakly scattering random lasers. A generalization to random laser with dense and strong scattere...

  3. A marketing strategy for a nursing college.

    Science.gov (United States)

    Pryde, M; Muller, M

    1995-08-01

    The objective of this study is to explore and describe a marketing strategy for a nursing college. An explorative and descriptive research design, within the context of a nursing college and affiliated hospitals, was followed. A literature study of marketing models was undertaken and the Delphi-method was utilised to determine the contribution of marketing staff and the possible content of a marketing strategy for a nursing college. The results were utilised to describe guidelines for such a strategy, consisting of marketers/marketing agents, target market, product, price, promotional activities, place and market research. Recommendations include the planning, implementation and evaluation of strategy, inservice training for potential marketing agents, inclusion of marketing as part of the formal education of tutors and nurse managers, as well as an impact study of the scholar as the main consumer.

  4. A reductive coupling strategy towards ripostatin A.

    Science.gov (United States)

    Schleicher, Kristin D; Jamison, Timothy F

    2013-01-01

    Synthetic studies on the antibiotic natural product ripostatin A have been carried out with the aim to construct the C9-C10 bond by a nickel(0)-catalyzed coupling reaction of an enyne and an epoxide, followed by rearrangement of the resulting dienylcyclopropane intermediate to afford the skipped 1,4,7-triene. A cyclopropyl enyne fragment corresponding to C1-C9 has been synthesized in high yield and demonstrated to be a competent substrate for the nickel(0)-catalyzed coupling with a model epoxide. Several synthetic approaches toward the C10-C26 epoxide have been pursued. The C13 stereocenter can be set by allylation and reductive decyanation of a cyanohydrin acetonide. A mild, fluoride-promoted decarboxylation enables construction of the C15-C16 bond by an aldol reaction. The product of this transformation is of the correct oxidation state and potentially three steps removed from the targeted epoxide fragment.

  5. SUPERNOVA 1987A: CELEBRATING A SILVER JUBILEE

    Directory of Open Access Journals (Sweden)

    Nino Panagia

    2013-12-01

    Full Text Available The story of the SN 1987A explosion is briefly reviewed. Although this supernova was somewhat peculiar, the study of SN 1987A has clarified quite a number of important aspects of the nature and the properties of supernovae, such as the confirmation of the core collapse of a massive star as the cause of the explosion, as well the confirmation that the decays 56Ni–56Co–56Fe at early times and 44Ti–44Sc at late times, are the main sources of the energy radiated by the ejecta. Still we have not been able to ascertain whether the progenitor was a single star or a binary system, nor have we been able to detect the stellar remnant, a neutron star that should be produced in the core collapse process.

  6. A new biology for a new century.

    Science.gov (United States)

    Woese, Carl R

    2004-06-01

    Biology today is at a crossroads. The molecular paradigm, which so successfully guided the discipline throughout most of the 20th century, is no longer a reliable guide. Its vision of biology now realized, the molecular paradigm has run its course. Biology, therefore, has a choice to make, between the comfortable path of continuing to follow molecular biology's lead or the more invigorating one of seeking a new and inspiring vision of the living world, one that addresses the major problems in biology that 20th century biology, molecular biology, could not handle and, so, avoided. The former course, though highly productive, is certain to turn biology into an engineering discipline. The latter holds the promise of making biology an even more fundamental science, one that, along with physics, probes and defines the nature of reality. This is a choice between a biology that solely does society's bidding and a biology that is society's teacher.

  7. A marketing strategy for a nursing college

    Directory of Open Access Journals (Sweden)

    M. Pryde

    1995-05-01

    Full Text Available The objective of this study is to explore and describe a marketing strategy for a nursing college. An explorative and descriptive research design, within the context of a nursing college and affiliated hospitals, was followed. A literature study of marketing models was undertaken and the Delphi-method was utilised to determine the contribution of marketing staff and the possible content of a marketing strategy for a nursing college. The results were utilised to describe guidelines for such a strategy, consisting of marketers/marketing agents, target market, product, price, promotional activities, place and market research. Recommendations include the planning, implementation and evaluation of strategy, inservice training for potential marketing agents, inclusion of marketing as part of the formal education of tutors and nurse managers,as well as an impact study of the scholar as the main consumer.

  8. A Project Team: A Team or Just a Group?

    Directory of Open Access Journals (Sweden)

    Katerina Hrazdilova Bockova

    2013-11-01

    Full Text Available This paper deals with issues related to work in either teams or groups. The theoretical part which discusses a team and a group with regards to its definition, classification and basic distinction brings in more on the typology of team roles, personality assessment and sociometric methods. The analytical part tests the project (work team of a medical center represented in terms of personality and motivational types, team roles and interpersonal team relations concerning the willingness of cooperation and communication. The main objective of this work was to determine whether the existing team is not by its nature rather a working group that contributes to the generally perceived stagnation of that field.

  9. A coinsidence, a chance or a misfortune? Hangman's fracture.

    Science.gov (United States)

    Dalbayrak, Sedat; Yaman, Onur

    2014-01-01

    William R. Francis and Bassam El-Effendi shared a common ground: they were the first individuals to classify Hangman's Fractures. Interestingly, although they were unaware of each other, they classified and published their findings in the same year, published in the same edition of the same journal (but on different pages). This new classification system was a chance for notoriety for El-Effendi, yet it was a misfortune for Francis. Both physicians graduated in 1973 (from different universities). Also fellows at different universities in 1981, they were also both unaware they studied the same topic. Coincidentally, their paths crossed in the same edition of a journal where their studies were published in the same year, which was unprecedented in the literature. One classification scheme is well-known while the other is almost completely unheard of for no apparent reason other than chance for one and misfortune for the other.

  10. When is a theory a theory? A case example.

    Science.gov (United States)

    Alkin, Marvin C

    2016-10-15

    This discussion comments on the approximately 20years history of writings on the prescriptive theory called Empowerment Evaluation. To do so, involves examining how "Empowerment Evaluation Theory" has been defined at various points of time (particularly 1996 and now in 2015). Defining a theory is different from judging the success of a theory. This latter topic has been addressed elsewhere by Michael Scriven, Michael Patton, and Brad Cousins. I am initially guided by the work of Robin Miller (2010) who has written on the issue of how to judge the success of a theory. In doing so, she provided potential standards for judging the adequacy of theories. My task is not judging the adequacy or success of the Empowerment Evaluation prescriptive theory in practice, but determining how well the theory is delineated. That is, to what extent do the writings qualify as a prescriptive theory.

  11. Haemorrhage in a scrotal lymphangioma in a child: A rarity

    Directory of Open Access Journals (Sweden)

    Rattan Kamal

    2009-01-01

    Full Text Available We report here a case of cystic lymphangioma of scrotum presenting as acute scrotum due to haemorrhage. The diagnosis was confirmed on ultrasonography and magnetic resonance imaging and managed successfully by surgical excision. There was past history of bilateral congenital cataract for which the patient had undergone surgery with complete visual recovery. Scrotal cystic lymphangioma complicated by haemorrhage is rare; hence, the case is being reported with a review of literature.

  12. A stump appendicitis in a child: a case report

    Directory of Open Access Journals (Sweden)

    Jemaï Radhia

    2009-11-01

    Full Text Available Abstract Background Stump appendicitis is a delayed complication of appendectomy. It is rare and few cases reported in the paediatric literature. The authors report on another case in a child and focus on the diagnostic peculiarities of this entity. Case A 9-year-old boy with previous history of open appendectomy was admitted for a right lower quadrant pain with bilious vomiting and fever. Physical examination demonstrated tenderness in the right lower quadrant and guarding over the appendectomy scar. The white blood cell count was 23.500 cells/mm3. Plain abdominal radiograph and ultrasonography revealed fecalith localized in the right iliac fossa. The diagnosis of stump appendicitis was advocated and confirmed at laparotomy. A gangrenous and perforated appendiceal stump was found and completely removed. The post-operative course was uneventful after 18 months follow-up period. Conclusion Stump appendicitis is rare and should be considered in any patient with right lower quadrant pain even if there is a history of appendectomy. Complete removal of the appendix is the only mean to prevent the occurrence of this complication.

  13. Tricolorin A as a Natural Herbicide

    Directory of Open Access Journals (Sweden)

    Blas Lotina-Hennsen

    2013-01-01

    Full Text Available Tricolorin A acts as pre- and post-emergence plant growth inhibitor. In pre-emergence it displays broad-spectrum weed control, inhibiting germination of both monocotyledonous (Lolium mutliflorum and Triticum vulgare and dicotyledonous (Physalis ixocarpa and Trifolium alexandrinum seeds, being the dicotyledonous seeds the most inhibited. Tricolorin A also inhibited seedling growth, and seed respiration, and since the concentrations required for inhibiting both germination and respiration were similar, we suggest that respiration is one of its targets. Tricolorin A at 60 µM acts as a post- emergence plant growth inhibitor by reducing dry plant biomass by 62%, 37%, 33%, and 22% for L. multiflorum, T. alexandrinum, T. vulgare, and P. ixocarpa, respectively, 18 days after its application. In order to determine the potency of tricolorin A as a plant growth inhibitor, paraquat was used as control; the results indicate that tricolorin A acts as a non-selective post-emergence plant growth inhibitor similar to paraquat, since both reduced the biomass production in P. ixocarpa and T. alexandrinum. Therefore, we suggest that tricolorin A will be a good biodegradable herbicide for weeds.

  14. A system architecture for a planetary rover

    Science.gov (United States)

    Smith, D. B.; Matijevic, J. R.

    1989-01-01

    Each planetary mission requires a complex space vehicle which integrates several functions to accomplish the mission and science objectives. A Mars Rover is one of these vehicles, and extends the normal spacecraft functionality with two additional functions: surface mobility and sample acquisition. All functions are assembled into a hierarchical and structured format to understand the complexities of interactions between functions during different mission times. It can graphically show data flow between functions, and most importantly, the necessary control flow to avoid unambiguous results. Diagrams are presented organizing the functions into a structured, block format where each block represents a major function at the system level. As such, there are six blocks representing telecomm, power, thermal, science, mobility and sampling under a supervisory block called Data Management/Executive. Each block is a simple collection of state machines arranged into a hierarchical order very close to the NASREM model for Telerobotics. Each layer within a block represents a level of control for a set of state machines that do the three primary interface functions: command, telemetry, and fault protection. This latter function is expanded to include automatic reactions to the environment as well as internal faults. Lastly, diagrams are presented that trace the system operations involved in moving from site to site after site selection. The diagrams clearly illustrate both the data and control flows. They also illustrate inter-block data transfers and a hierarchical approach to fault protection. This systems architecture can be used to determine functional requirements, interface specifications and be used as a mechanism for grouping subsystems (i.e., collecting groups of machines, or blocks consistent with good and testable implementations).

  15. A Burger, A Beer, and A Side of Science

    Science.gov (United States)

    Wiehe, Ben; Landsberg, R. H.; Wyatt, R. J.; Turner, M. S.

    2008-05-01

    Science Cafés (aka Café Scientifiques) engage unconventional adult audiences and help researchers hone their communication skills in a relaxed and fun setting. Typically held in restaurants and pubs, Science Cafés provide a comfortable place for the public to speak with a scientist. National and local evaluations of the Café format indicate that cafes are an effective way to engage adult audiences (especially non-scientists). Continued media coverage also demonstrate that something about them captures the public's imagination. Join us for an interactive session about organizing, presenting and partnering with Science Cafés to bring IYA themes (and other current research) directly to new audiences. Real world examples from experienced Café organizers and presenters will provide an overview of what a Science Café is, how to start one and how to use the format to draw attention to astronomy topics. The discussion will include suggestions for tapping into the existing national and international community of Cafés (there are more than 60 in the US alone), and information about free outreach resources. Break-out exercises will help prepare you to: find a suitable venue, advertise, work with café speakers, and foster the inclusive conversation that is the hallmark of a Science Café. Participants will also learn about the impacts that can be expected from a Science Café including benefits to audiences, Café presenters, and hosting organizations. The overall goal of this session is to stimulate a discussion about strategies for facilitating face-to-face communication between scientists and lay audiences. Participants will have the opportunity to create their own promotional plan for a Café event, including the important process of framing a topic to grab public attention, and developing strategies for reaching new target audiences. Substantial time will be allowed for participants to discuss how the Science Café format might be adapted for their specific

  16. Starting a business through a franchise

    Directory of Open Access Journals (Sweden)

    Dubravka Mahaček

    2013-12-01

    Full Text Available A business can be launched by establishing a new entity, purchasing an existing entity or through a franc - hise. There are certain prerequisites for starting a business, the most important ones being a quality idea and start-up capital. Potential start-up difficulties are inadequate financing, existing competition as well as the process of building your own market position. By purchasing an existing business some risks may be avoided and the opportunity for gaining profit may arise. Profitable operation is possible only if this business has up-to-date products and no outstanding liabilities. This paper discusses franchising business opportunities and the requisite investments and costs, which will bring success if they are accompanied by franchisee’s efforts. The paper aims to present the main characteristics of a franchise business, the necessary investment and the costs which arise in the process, as well as advantages, disadvantages and experiences with this kind of business

  17. A água e a vida

    Directory of Open Access Journals (Sweden)

    JOSÉ CARLOS BRUNI

    1993-12-01

    Full Text Available Trata-se de exercício de interpretação da frase “tudo é água”, atribuída a Tales de Mileto. Depois da exposição dos pontos de vista do senso comum, da ciência e da filosofia sobre a utilidade da água para a vida, tenta-se recuperar, na dimensão simbólica, suas significações mais profundas como fonte, purificação e regeneração da vida humana. O artigo sugere que a poluição das águas pela moderna sociedade industrial agride brutalmente não só a vida biológica como também a vida psíquica.

  18. A tunable DNA spring in a nanochannel

    Science.gov (United States)

    Riehn, Robert; Staunton, Rory; Lim, Shuang Fang; Bruinsma, Robijn; Reisner, Walter; Austin, Robert

    2007-03-01

    dsDNA becomes linearized when it is confined to nanofluidic channels with a cross-section of (100 nm)^2 or less, which has made them interesting for genomic DNA analyses. DNA is typically manipulated by means of electric fields. We have found that DNA undergoes a phase transition to a condensed state if an a.c. electric field is applied along the channel direction. The molecule collapses to about 1/4 of it's initial contour length. We will discuss how the effect depends on parameters such as frequency, field strength, channel dimensions, and will discuss the origin of the effect. Interestingly, DNA behaves like an artifical muscle that can be triggered by an a.c. electric field. Since the interaction is expected to hold for any solubilized polyelectrolyte, we speculate that the mechanism may lead to a new class of polymer-based mechanical actuators. These would not suffer from depolarization like piezo transducers.

  19. GRB 130427A: a Nearby Ordinary Monster

    CERN Document Server

    Maselli, A; Nava, L; Mundell, C G; Kawai, N; Campana, S; Covino, S; Cummings, J R; Cusumano, G; Evans, P A; Ghirlanda, G; Ghisellini, G; Guidorzi, C; Kobayashi, S; Kuin, P; La Parola, V; Mangano, V; Oates, S; Sakamoto, T; Serino, M; Virgili, F; Zhang, B -B; Barthelmy, S; Beardmore, A; Bernardini, M G; Bersier, D; Burrows, D; Calderone, G; Capalbi, M; Chiang, J; D'Avanzo, P; D'Elia, V; De Pasquale, M; Fugazza, D; Gehrels, N; Gomboc, A; Harrison, R; Hanayama, H; Japelj, J; Kennea, J; Kopac, D; Kouveliotou, C; Kuroda, D; Levan, A; Malesani, D; Marshall, F; Nousek, J; O'Brien, P; Osborne, J P; Pagani, C; Page, K L; Page, M; Perri, M; Pritchard, T; Romano, P; Saito, Y; Sbarufatti, B; Salvaterra, R; Steele, I; Tanvir, N; Vianello, G; Weigand, B; Wiersema, K; Yatsu, Y; Yoshii, T; Tagliaferri, G

    2014-01-01

    Long-duration Gamma-Ray Bursts (GRBs) are an extremely rare outcome of the collapse of massive stars, and are typically found in the distant Universe. Because of its intrinsic luminosity ($L\\sim 3 \\times 10^{53}$ erg s$^{-1}$) and its relative proximity ($z=0.34$), GRB 130427A was a unique event that reached the highest fluence observed in the gamma-ray band. Here we present a comprehensive multiwavelength view of GRB 130427A with Swift, the 2-m Liverpool and Faulkes telescopes and by other ground-based facilities, highlighting the evolution of the burst emission from the prompt to the afterglow phase. The properties of GRB 130427A are similar to those of the most luminous, high-redshift GRBs, suggesting that a common central engine is responsible for producing GRBs in both the contemporary and the early Universe and over the full range of GRB isotropic energies.

  20. A Wonderful Adventure to a Rainforest

    Institute of Scientific and Technical Information of China (English)

    楼雯雯

    2005-01-01

    I’d like to go to a rainforest—the place I’ve alw ays dream t of going to. D uring m y long holiday in M ay, it m ay take a w eek to be on m y adventure. A nd I think it’ll be a really fantastic journey as there m ust be a va- riety of creatures along m y w ay. W henever I get tired and bored,they’ll cheer m e up.D if- ferent creatures m ake m e excited. A nd the m ore dangerous m y journey is, the m ore curi- ous I w ill be. I m ay get to m y destination by air, but in order to enjoy m y journey to the ful...

  1. When is a bottleneck a bottleneck?

    CERN Document Server

    Schadschneider, Andreas; Popkov, Vladislav

    2015-01-01

    Bottlenecks, i.e. local reductions of capacity, are one of the most relevant scenarios of traffic systems. The asymmetric simple exclusion process (ASEP) with a defect is a minimal model for such a bottleneck scenario. One crucial question is "What is the critical strength of the defect that is required to create global effects, i.e. traffic jams localized at the defect position". Intuitively one would expect that already an arbitrarily small bottleneck strength leads to global effects in the system, e.g. a reduction of the maximal current. Therefore it came as a surprise when, based on computer simulations, it was claimed that the reaction of the system depends in non-continuous way on the defect strength and weak defects do not have a global influence on the system. Here we reconcile intuition and simulations by showing that indeed the critical defect strength is zero. We discuss the implications for the analysis of empirical and numerical data.

  2. Stretching a Semiflexible Polymer in a Tube

    Directory of Open Access Journals (Sweden)

    Runhua Li

    2016-09-01

    Full Text Available How the statistical behavior of semiflexible polymer chains may be affected by force stretching and tube confinement is a classical unsolved problem in polymer physics. Based on the Odijk deflection theory and normal mode decomposition in terms of Fourier expansion, we have derived a new compact formula for the extension of a wormlike chain of finite length strongly confined in a tube and simultaneously stretched by an external force. We have also suggested a new deflection length, which together with the force-extension relation is valid for a very extended range of the tube-diameter/persistence-length ratio comparing to the classic Odijk theory. The newly derived formula has no adjustable fitting parameters for the whole deflection regime; in contrast, the classic Odijk length needs different prefactors to fit the free energy and average extension, respectively. Brownian dynamics simulations based on the Generalized Bead-Rod (GBR model were extensively performed, which justified the theoretical predictions.

  3. A Small Deformation of a Simple Theory

    CERN Document Server

    Buican, Matthew

    2016-01-01

    We study an interesting relevant deformation of the simplest interacting N=2 SCFT---the original Argyres-Douglas (AD) theory. We argue that, although this deformation is not strictly speaking Banks-Zaks like (certain operator dimensions change macroscopically), there are senses in which it constitutes a mild deformation of the parent AD theory: the exact change in the "a" anomaly is small and is essentially saturated at one loop. Moreover, contributions from IR operators that have a simple description in the UV theory reproduce a particular limit of the IR index to a remarkably high order. These results lead us to conclude that the IR theory is an N=1 SCFT with the smallest-known "a" and "c" central charges for an interacting SCFT in four dimensions.

  4. Broadcasting a message in a parallel computer

    Energy Technology Data Exchange (ETDEWEB)

    Archer, Charles J; Faraj, Daniel A

    2014-11-18

    Methods, systems, and products are disclosed for broadcasting a message in a parallel computer that includes: transmitting, by the logical root to all of the nodes directly connected to the logical root, a message; and for each node except the logical root: receiving the message; if that node is the physical root, then transmitting the message to all of the child nodes except the child node from which the message was received; if that node received the message from a parent node and if that node is not a leaf node, then transmitting the message to all of the child nodes; and if that node received the message from a child node and if that node is not the physical root, then transmitting the message to all of the child nodes except the child node from which the message was received and transmitting the message to the parent node.

  5. A numerical simulation of a contrail

    Energy Technology Data Exchange (ETDEWEB)

    Levkov, L.; Boin, M.; Meinert, D. [GKSS-Forschungszentrum Geesthacht GmbH, Geesthacht (Germany)

    1997-12-31

    The formation of a contrail from an aircraft flying near the tropopause is simulated using a three-dimensional mesoscale atmospheric model including a very complex scheme of parameterized cloud microphysical processes. The model predicted ice concentrations are in very good agreement with data measured during the International Cirrus Experiment (ICE), 1989. Sensitivity simulations were run to determine humidity forcing on the life time of contrails. (author) 4 refs.

  6. [Pneumomediastinum during a dermatomyositis: a rare entity].

    Science.gov (United States)

    Majdoub, Senda; Zemni, Houcem; Zaghouani, Houneida; Ben Salem, Halima Houda; Amara, Habib; Bakir, Dajla; Kraeim, Chakib

    2016-01-01

    Dermatomyositis is a connective characterized by inflammation of skeletal muscle with cutaneous manifestations. Their etiologies, still unknown, associate environmental and genetic factors. Among lung complications described, interstitial pneumopathies are common complications. Other complications are rarely reported as pneumomediastinum. We report a case of pneumomediastinum with aeric in massive skin dissection occurred in a patient with dermatomyositis. We will discuss the frequency, causes and pathophysiology of the disease according to the literature.

  7. Transforming a small business: A learning intervention

    Directory of Open Access Journals (Sweden)

    Dirk J. Geldenhuys

    2012-01-01

    Full Text Available Orientation: This article reports on a learning intervention in a brokers company with fewer than 50 employees. A rich description of the participants’ experience is provided. Research purpose: The purpose of the study was to explore the use of an experiential learning process during an organisation development (OD intervention in a small business by means of a case study.Motivation for the study: This study explored the important role of small businesses; the role of management; and, more specifically, organisation development models that were developed for large corporations; as these emphasise the need to study the purpose of organisation development interventions in small businesses.Research design, approach and method: The study reported on in this article was a qualitative case study in a small brokers company with 21 staff members. The data were analysed manually by means of qualitative content analysis.Main findings: The main finding of the research concerned how experiential learning intervention provided a space for participants to start exploring, and gradually changing the dynamics of their small business, by transforming their business into a more formal company.Practical/managerial implications: The primary implication is that experiential learning interventions that are operationalised, from a psychodynamic perspective, can be valuable when consulted by small businesses during their transformation towards becoming more formal companies.Contribution/value-add: This article contributes to the OD literature on small businesses, with fewer than 50 employees, by providing data on how the learning process, that commenced during an experiential learning intervention, assisted a small company to develop its identity towards that of a more formal company.

  8. Opportunity of a Lifetime: A Student's Perspective

    Science.gov (United States)

    Gomez, Carlos

    2010-01-01

    In this article, the author shares his journey of obstacles he has endured in his life. The author's journey begins in Tequila, a small town of Mexico, with his cherished and young mother giving birth at the age of 16. He is the oldest and only son, in a family of two younger sisters and two hard-working parents. Poverty has been a reality for his…

  9. Playing a quantum game with a qutrit

    Energy Technology Data Exchange (ETDEWEB)

    Sinha, Urbasi [Institute for Quantum Computing, University of Waterloo, 200 University Avenue West, Waterloo, Ontario, Canada N2L3G1 and Raman Research Institute, Sadashivanagar, Bangalore 560080 (India); Kolenderski, Piotr [Institute for Quantum Computing, University of Waterloo, 200 University Avenue West, Waterloo, Ontario, Canada N2L3G1 and Institute of Physics, Copernicus University, Grudziqdzka 5, 87-100 Torun (Poland); Youning, Li [Department of Physics, Tsinghua University, Beijing 100084, P.R. (China); Zhao, Tong; Volpini, Matthew; Laflamme, Raymond; Jennewein, Thomas [Institute for Quantum Computing, University of Waterloo, 200 University Avenue West, Waterloo, Ontario N2L3G1 (Canada); Cabello, Adan [Departmento de Fisica Aplicada II, Universidad de Sevilla, E-41012, Sevilla, Spain and Department of Physics, Stockholm University, S-10691 Stockholm (Sweden)

    2014-12-04

    The Aharon Vaidman (AV) quantum game [1] demonstrates the advantage of using simple quantum systems to outperform classical strategies. We present an experimental test of this quantum advantage by using a three-state quantum system (qutrit) encoded in a spatial mode of a single photon passing through a system of three slits [2,3]. We prepare its states by controlling the photon propagation and the number of open and closed slits. We perform POVM measurements by placing detectors in the positions corresponding to near and far field. These tools allow us to perform tomographic reconstructions of qutrit states and play the AV game with compelling evidence of the quantum advantage.

  10. Registered access: a 'Triple-A' approach.

    Science.gov (United States)

    Dyke, Stephanie O M; Kirby, Emily; Shabani, Mahsa; Thorogood, Adrian; Kato, Kazuto; Knoppers, Bartha M

    2016-12-01

    We propose a standard model for a novel data access tier - registered access - to facilitate access to data that cannot be published in open access archives owing to ethical and legal risk. Based on an analysis of applicable research ethics and other legal and administrative frameworks, we discuss the general characteristics of this Registered Access Model, which would comprise a three-stage approval process: Authentication, Attestation and Authorization. We are piloting registered access with the Demonstration Projects of the Global Alliance for Genomics and Health for which it may provide a suitable mechanism for access to certain data types and to different types of data users.

  11. Simulating a guitar with a conventional sonometer

    CERN Document Server

    Burstein, Zily; Varieschi, Gabriele U

    2011-01-01

    Musical acoustics is an interesting sub-field of physics which is usually able to engage students in a dual perspective, by combining science and art together. The physics principles involved in most musical instruments can be easily demonstrated with standard laboratory equipment and can become part of lecture or lab activities. In particular, we will show in this paper how to simulate a guitar using a conventional sonometer, in relation to the problem of the instrument intonation, i.e., how to obtain correctly tuned notes on a guitar or similar string instruments.

  12. CASAS: A Smart Home in a Box

    OpenAIRE

    Cook, Diane J.; Crandall, Aaron S.; Thomas, Brian L.; Krishnan, Narayanan C.

    2012-01-01

    While the potential benefits of smart home technology are widely recognized, a lightweight design is needed for the benefits to be realized at a large scale. We introduce the CASAS “smart home in a box”, a lightweight smart home design that is easy to install and provides smart home capabilities out of the box with no customization or training. We discuss types of data analysis that have been performed by the CASAS group and can be pursued in the future by using this approach to designing and...

  13. Simulating a Guitar with a Conventional Sonometer

    Science.gov (United States)

    Burstein, Zily; Gower, Christina M.; Varieschi, Gabriele U.

    Musical acoustics is an interesting sub-field of physics which is usually able to engage students in a dual perspective, by combining science and art together. The physics principles involved in most musical instruments can be easily demonstrated with standard laboratory equipment and can become part of lecture or lab activities. In particular, we will show in this paper how to simulate a guitar using a conventional sonometer, in relation to the problem of the instrument intonation, i.e., how to obtain correctly tuned notes on a guitar or similar string instruments.

  14. A água e a vida

    OpenAIRE

    JOSÉ CARLOS BRUNI

    1993-01-01

    Trata-se de exercício de interpretação da frase “tudo é água”, atribuída a Tales de Mileto. Depois da exposição dos pontos de vista do senso comum, da ciência e da filosofia sobre a utilidade da água para a vida, tenta-se recuperar, na dimensão simbólica, suas significações mais profundas como fonte, purificação e regeneração da vida humana. O artigo sugere que a poluição das á...

  15. A City Is a Complex Network

    CERN Document Server

    Jiang, Bin

    2015-01-01

    A city is not a tree but a semi-lattice. To use a more fashionable term, a city is a complex network. The complex network constitutes a unique topological perspective on cities and enables us to better understand the kind of problem a city is. The topological perspective differentiates it from the perspectives of Euclidean geometry and Gaussian statistics that deal with essentially regular shapes and more or less similar things. Many urban theories, such as the Central Place Theory, Zipf's Law, the Image of the City, and the Theory of Centers can be interpreted from the point of view of complex networks. A livable city consists of far more small things than large ones, and their shapes tend to be irregular and rough. This chapter illustrates the complex network view and argues that we must abandon the kind of thinking guided by Euclidean geometry and Gaussian statistics, and instead adopt fractal geometry, power-law statistics, and Alexander's living geometry to develop sustainable cities. Keywords: Scaling, ...

  16. Converting a Display Screen into a Touchscreen

    Institute of Scientific and Technical Information of China (English)

    Qun Wang; Jun Cheng; San-Ming Shen; Yi-Jiang Shen; Jian-Xin Pang

    2014-01-01

    A method is presented to convert any display screen into a touchscreen by using a pair of cameras. Most state of art touchscreens make use of special touch-sensitive hardware or depend on infrared sensors in various configurations. We describe a novel computer-vision-based method that can robustly identify fingertips and detect touch with a precision of a few millimeters above the screen. In our system, the two cameras capture the display screen image simultaneously. Users can interact with a computer by the fingertip on the display screen. We have two important contributions:first, we develop a simple and robust hand detection method based on predicted images. Second, we determine whether a physical touch takes places by the homography of the two cameras. In this system, the appearance of the display screen in camera images is inherently predictable from the computer output images. Therefore, we can compute the predicted images and extract human hand precisely by simply subtracting the predicted images from captured images.

  17. SN 1987A - a linear polarimetric study

    Energy Technology Data Exchange (ETDEWEB)

    Mendez, M.; Clocchiatti, A.; Benvenuto, O.G.; Feinstein, C.; Marraco, H.G.

    1988-11-01

    Multicolor linear polarimetric observations of SN 1987A have been obtained between February 28 and April 29, 1987. The intrinsic polarization was shown to decrease at a constant position angle of 27 deg during the first month after the explosion, and 30 days after the explosion the polarization began to grown in the V, R, and I filters at a different position angle. A model to interpret this behavior is proposed. Results are presented for the expansion of the outer layers of the SN and the evolution of the photospheric density. 28 references.

  18. CASAS: A Smart Home in a Box.

    Science.gov (United States)

    Cook, Diane J; Crandall, Aaron S; Thomas, Brian L; Krishnan, Narayanan C

    2013-07-01

    While the potential benefits of smart home technology are widely recognized, a lightweight design is needed for the benefits to be realized at a large scale. We introduce the CASAS "smart home in a box", a lightweight smart home design that is easy to install and provides smart home capabilities out of the box with no customization or training. We discuss types of data analysis that have been performed by the CASAS group and can be pursued in the future by using this approach to designing and implementing smart home technologies.

  19. A method for making a battery

    Energy Technology Data Exchange (ETDEWEB)

    Yamadzaki, K.; Kumano, Y.; Nakanisi, M.; Yamane, T.

    1982-08-09

    A layer of electrolyte which is melted with heating is made by pressing at a pressure of 0.1 to 0.8 tons of force per square centimeter a powder form compound. The inorganic adsorbent is first impregnated with an electrolyte, hardened by cooling and ground. The obtained disk with an interior opening is pressed at high pressure of 0.5 to 3 tons of force per square centimeter with a layer of an agglomerate mass. Elements made from the two layered disk, the anode and the body, have high mechanical strength. The internal resistance in the element is reduced. The battery has high discharge characteristics.

  20. What's a Vegetarian?

    Science.gov (United States)

    ... What Happens in the Operating Room? What's a Vegetarian? KidsHealth > For Kids > What's a Vegetarian? A A ... cows) and eggs (from chickens). Many Types of Vegetarians There are many kinds of vegetarians. Here are ...

  1. What's a Birthmark?

    Science.gov (United States)

    ... or Too Short All About Puberty What's a Birthmark? KidsHealth > For Kids > What's a Birthmark? Print A ... and usually disappear early in life. Types of Hemangiomas One kind of hemangioma is called a superficial ...

  2. A dictionary is a tool, a good dictionary is a monofunctional tool

    DEFF Research Database (Denmark)

    2011-01-01

    A dictionary is a tool. Most dictionaries are constructed as polyfunctional tools: they are expected to be used by everyone in any kind of user situation with communicative and cognitive problems. Good tools are not polyfunctional. If you go to a shop and ask for a saw, you have to specify first...... what you are intend to saw: a big tree or a small piece of plywood. You will be offered a monofunctional saw. It should be the same for information tools. A good tool is a tool conceived for a certain function and for a certain user group for certain needs. This paper will argue for the need...

  3. A characterization of associativity

    Science.gov (United States)

    Charlesworth, Arthur

    1990-01-01

    A necessary and sufficient condition for associativity of a function is given, in terms of a particular relation being a function. The concept of an associative function is generalized to the concept of a function being asssociative relative to a sequence and a characterization of such relative associativity is also given. These two characteristics are applied to the problem of proving the associativity, or relative associativity, of a function.

  4. Towards a personalized Internet: a case for a full decentralization.

    Science.gov (United States)

    Kermarrec, Anne-Marie

    2013-03-28

    The Web has become a user-centric platform where users post, share, annotate, comment and forward content be it text, videos, pictures, URLs, etc. This social dimension creates tremendous new opportunities for information exchange over the Internet, as exemplified by the surprising and exponential growth of social networks and collaborative platforms. Yet, niche content is sometimes difficult to retrieve using traditional search engines because they target the mass rather than the individual. Likewise, relieving users from useless notification is tricky in a world where there is so much information and so little of interest for each and every one of us. We argue that ultra-specific content could be retrieved and disseminated should search and notification be personalized to fit this new setting. We also argue that users' interests should be implicitly captured by the system rather than relying on explicit classifications simply because the world is by nature unstructured, dynamic and users do not want to be hampered in their actions by a tight and static framework. In this paper, we review some existing personalization approaches, most of which are centralized. We then advocate the need for fully decentralized systems because personalization raises two main issues. Firstly, personalization requires information to be stored and maintained at a user granularity which can significantly hurt the scalability of a centralized solution. Secondly, at a time when the 'big brother is watching you' attitude is prominent, users may be more and more reluctant to give away their personal data to the few large companies that can afford such personalization. We start by showing how to achieve personalization in decentralized systems and conclude with the research agenda ahead.

  5. Mapping a Space for a Rhetorical-Cultural Analysis: A Case of a Scientific Proposal

    Science.gov (United States)

    Dorpenyo, Isidore Kafui

    2015-01-01

    This article analyzes a proposal submitted to a funding unit in Michigan Technological University by a PhD Forestry student. A rhetorical-cultural approach of the text provides evidence to argue that scientific writing is rooted in a cultural practice that valorizes certain kinds of thought, practices, rituals, and symbols; that a scientist's work…

  6. Mapping a Space for a Rhetorical-Cultural Analysis: A Case of a Scientific Proposal

    Science.gov (United States)

    Dorpenyo, Isidore Kafui

    2015-01-01

    This article analyzes a proposal submitted to a funding unit in Michigan Technological University by a PhD Forestry student. A rhetorical-cultural approach of the text provides evidence to argue that scientific writing is rooted in a cultural practice that valorizes certain kinds of thought, practices, rituals, and symbols; that a scientist's work…

  7. A Pretty Good Fit

    Science.gov (United States)

    Erickson, Tim

    2008-01-01

    We often look for a best-fit function to a set of data. This article describes how a "pretty good" fit might be better than a "best" fit when it comes to promoting conceptual understanding of functions. In a pretty good fit, students design the function themselves rather than choosing it from a menu; they use appropriate variable names; and they…

  8. Ever Fly a Tetrahedron?

    Science.gov (United States)

    King, Kenneth

    2004-01-01

    Few things capture the spirit of spring like flying a kite. Watching a kite dance and sail across a cloud spotted sky is not only a visually appealing experience it also provides a foundation for studies in science and mathematics. Put simply, a kite is an airfoil surface that flies when the forces of lift and thrust are greater than the forces of…

  9. A Pleasing Birth

    NARCIS (Netherlands)

    Vries, De Raymond

    2005-01-01

    Women have long searched for a pleasing birth-a birth with a minimum of fear and pain, in the company of supportive family, friends, and caregivers, a birth that ends with a healthy mother and baby gazing into each other's eyes. For women in the Netherlands, such a birth is defined as one at home un

  10. Ciencia: Nivel A (Science: Level A).

    Science.gov (United States)

    Duron, Dolores; And Others

    A teacher's manual was developed for an elementary level science course in Spanish as part of an immersion program for English speaking children. The Level A manual is designed for kindergarten and grade 1 pupils. The five units cover the basic concepts of the weather, colors, animals, plants, and the five senses. Each unit includes vocabulary,…

  11. When a body meets a body

    DEFF Research Database (Denmark)

    Pelowski, Matthew John; Liu, Tao; Palacios, Victor

    2014-01-01

    We consider the phenomenon of social interactions within the art museum, arguing that even the bare possibility of meeting others or intruding into their gaze can have a profoundly detrimental effect on art experience. This is done by tracing a finding from our previous studies in which we consid...

  12. Life of a Tooth: A Visual Timeline

    Medline Plus

    Full Text Available ... Bomberman atari oyunlarý bakugan oyunlarý geta poker friv Home InfoBites Find an AGD Dentist Your Family's Oral ... words mean. The Life of a Tooth games Home | InfoBites | Find a Dentist | Your Family's Oral Health | ...

  13. Making a Computer Club, Making a Community.

    Science.gov (United States)

    Gillingham, M.; Youniss, E.

    2000-01-01

    Describes the development of a computer club at an inner city elementary school in Chicago. Discusses the sense of community that grew; parent involvement; scaffold learning; self-control; community service; difficulties in creating a sustainable innovation; and possible future directions. (Contains 11 references.) (LRW)

  14. A Miracle over A Decadef Wuxi Sunmart

    Institute of Scientific and Technical Information of China (English)

    2011-01-01

    @@ Miracle started A decade ago, Wuxi Sunmart was just no name.At that time, few people noticed Jiangsu Snow Leopard Atomi-zation Pot Industry Limited Company, which was established in early 1998, as it was a small workshop with the registered capital of only RMB 1.6 million.And that is where Wuxi Sunmart's miracle began.

  15. Radioactivity a history of a mysterious science

    CERN Document Server

    Malley, Marjorie C

    2011-01-01

    Beginning with an obscure discovery in 1896, radioactivity led researchers on a quest for understanding that ultimately confronted the intersection of knowledge and mystery. This book tells the story of a new science that profoundly changed physics and chemistry, as well as areas such as medicine, geology, meteorology, archaeology, industry, politics, and popular culture.

  16. Marry a Man, Not a House

    Institute of Scientific and Technical Information of China (English)

    Zhang Xiang

    2011-01-01

    I used to consider owning a house a must for my future husband.Men without good finances weren't appealing to me.After graduating university,I met my first boyfriend.I loved him,but I loved his money,too.Our romance only lasted several months and ended in my heartbreak.

  17. Matematicas: Nivel A (Mathematics: Level A).

    Science.gov (United States)

    Duron, Dolores; And Others

    A teacher's manual was developed for an elementary level mathematics course in Spanish as part of an immersion program for English speaking children. The Level A manual is designed for kindergarten and grade 1 pupils. Teaching procedures, conceptual objectives, vocabulary, and structures are included. Activities are designed to teach either…

  18. When a body meets a body

    DEFF Research Database (Denmark)

    Pelowski, Matthew John; Liu, Tao; Palacios, Victor

    2014-01-01

    We consider the phenomenon of social interactions within the art museum, arguing that even the bare possibility of meeting others or intruding into their gaze can have a profoundly detrimental effect on art experience. This is done by tracing a finding from our previous studies in which we consid...

  19. Death Ends a Life, not a Relationship

    DEFF Research Database (Denmark)

    Christensen, Dorthe Refslund; Sandvik, Kjetil

    2014-01-01

    In the final chapter, “Death Ends a Life, not a Relationship: objects as media on children’s graves”, Dorthe Refslund Christensen and Kjetil Sandvik investigate the relational affordances offered by objects as media in practices of death and commemoration on children’s graves. The authors argue t...

  20. "One Wears a Melon, Another a Cylinder"

    DEFF Research Database (Denmark)

    Shaw, Philip; Caudery, Tim; Petersen, Margrethe

    This paper analyses interviews with exchange students in four Scandinavian universities and conducts a longitudinal analysis of three picture descriptions spread over a twenty-week period. It briefly describes the opportunities available to exchange students for language learning, both English an...

  1. Danish - a Language with a Future?

    DEFF Research Database (Denmark)

    Petersen, Margrethe; Shaw, Philip

    1999-01-01

    A project on the use of English for academic purposes in Denmark has revealed that the academic article written in Danish may be a dying genre. Based on this finding and on observations on the use of English in Danish texts (or contexts), the future of the Danish language and of translation and i...

  2. Merging a Library and a Computing Center.

    Science.gov (United States)

    Plane, Robert A.

    1982-01-01

    Details are provided of the development of a new library at Clarkson College. It was seen from the start that the new center needed to be viewed as the hub of a campus-wide system to provide integrated informational support for instructional, research, and administrative activities of the entire college. (MP)

  3. Ciencia: Nivel A (Science: Level A).

    Science.gov (United States)

    Duron, Dolores; And Others

    A teacher's manual was developed for an elementary level science course in Spanish as part of an immersion program for English speaking children. The Level A manual is designed for kindergarten and grade 1 pupils. The five units cover the basic concepts of the weather, colors, animals, plants, and the five senses. Each unit includes vocabulary,…

  4. A Note on a Result of Pesin

    Institute of Scientific and Technical Information of China (English)

    Qu Yan-hui

    2003-01-01

    Pesin gives an equivalent definition of the pressures defined respectively by open covering and Bowen covering of the dynamical system which plays an important role in the studies on dimension theory in dynamical systems.In this note,we show a gap of his proof and present a proof for this result.

  5. A phylogenetic blueprint for a modern whale.

    Science.gov (United States)

    Gatesy, John; Geisler, Jonathan H; Chang, Joseph; Buell, Carl; Berta, Annalisa; Meredith, Robert W; Springer, Mark S; McGowen, Michael R

    2013-02-01

    The emergence of Cetacea in the Paleogene represents one of the most profound macroevolutionary transitions within Mammalia. The move from a terrestrial habitat to a committed aquatic lifestyle engendered wholesale changes in anatomy, physiology, and behavior. The results of this remarkable transformation are extant whales that include the largest, biggest brained, fastest swimming, loudest, deepest diving mammals, some of which can detect prey with a sophisticated echolocation system (Odontoceti - toothed whales), and others that batch feed using racks of baleen (Mysticeti - baleen whales). A broad-scale reconstruction of the evolutionary remodeling that culminated in extant cetaceans has not yet been based on integration of genomic and paleontological information. Here, we first place Cetacea relative to extant mammalian diversity, and assess the distribution of support among molecular datasets for relationships within Artiodactyla (even-toed ungulates, including Cetacea). We then merge trees derived from three large concatenations of molecular and fossil data to yield a composite hypothesis that encompasses many critical events in the evolutionary history of Cetacea. By combining diverse evidence, we infer a phylogenetic blueprint that outlines the stepwise evolutionary development of modern whales. This hypothesis represents a starting point for more detailed, comprehensive phylogenetic reconstructions in the future, and also highlights the synergistic interaction between modern (genomic) and traditional (morphological+paleontological) approaches that ultimately must be exploited to provide a rich understanding of evolutionary history across the entire tree of Life.

  6. Life of a Tooth: A Visual Timeline

    Medline Plus

    Full Text Available ... Jaw Pain? Check Your Posture! Learn what those dental words mean. The Life of a Tooth games Home | InfoBites | Find a Dentist | Your Family's Oral Health | Newsroom | RSS About AGD | Contact AGD | Site Map | ... | Terms and Conditions © 1996-2017 Academy of General Dentistry. All Rights Reserved.

  7. A military home with a heart.

    Science.gov (United States)

    Cowper, Andy

    2010-06-01

    A classically inspired and iconic building by the Thames in south west London, the Royal Hospital Chelsea is home to the equally iconic Chelsea pensioners--retired ex-military staff who have come to live in this unique retirement community. Now the nursing needs of this special group are being met in a new wing of the site, called the Margaret Thatcher Infirmary.

  8. A strong start, a promising future

    Institute of Scientific and Technical Information of China (English)

    Zihe Rao

    2011-01-01

    @@ Protein & Cell has made a very strong start in its first full year of publication, covering 12 monthly issues with a consistently high standard of content and production. Thanks to the contributors, editors, editorial board, editodal staff and publishers, both the scientific quality and the production quality of the journal have been outstanding.

  9. A Transmedia Topology of 'Making a Murderer'

    NARCIS (Netherlands)

    Hook, Alan; Barrios-O'Neill, Danielle; Mairs Dyer, Jolene

    2016-01-01

    textabstractThis article constructs a transmedia topology of the Making a Murderer text, demonstrating influences of various forms of documentary, interactive gaming culture, and post-digital writing on the series itself as well as on the paratextual cloud of works that grew up around it. Here we de

  10. "One Wears a Melon, Another a Cylinder"

    DEFF Research Database (Denmark)

    Shaw, Philip; Caudery, Tim; Petersen, Margrethe

    This paper analyses interviews with exchange students in four Scandinavian universities and conducts a longitudinal analysis of three picture descriptions spread over a twenty-week period. It briefly describes the opportunities available to exchange students for language learning, both English...

  11. A linguistic integration of a biological database

    Energy Technology Data Exchange (ETDEWEB)

    Collado-Vides, J. [Univ. Nacional Autonoma de Mexico, Morelos (Mexico)

    1993-12-31

    One of the major theoretical concerns associated with the Human Genome Project is that of the methodology to decipher ``raw`` sequences of DNA. This work is concerned with a subsequent problem, the one of how huge amounts of already deciphered information that will emerge in the near future can be integrated in order to enhance their biological understanding. The formal foundations for a linguistic theory of the regulation of gene expression will be discussed. The linguistic analysis presented here is restricted to sequences with known biological function since: (1) there is no way to obtain, from DNA sequences alone, a regulatory representation of transcription units, and (2) the elements of substitution -- methodologically equivalent to phonemes -- are complete sequences of the binding sites of proteins. The authors have recently collected and analyzed the regulatory regions of a large number of E. coli promoters. The number of sigma 70 promoters studied may well represent the largest homogeneous body of knowledge of gene regulation at present. This collection is a data set for the construction of a grammar of the sigma 70 system of transcription and regulation. This grammatical model generates all the arrays of the collection, as well as novel combinations predicted to be consistent with the principles of the data set. This Grammar is testable, as well as expandable if the analysis of emerging data requires it. The elaboration of a linguistic methodology capable of integrating prokaryotic data constitutes a preliminary step towards the analysis and integration of the more complex eukaryotic systems of regulation.

  12. Building a Digital Library on a Shoestring

    Science.gov (United States)

    Boyd, Kate Foster; Creighton, Alma

    2006-01-01

    In this article, the authors discuss ways one can create a digital library on a shoestring despite the current high technology costs. Here, they describe the University of South Carolina's digital library development. The cost associated with building and maintaining the digital collections seems to have been worth it based on the feedback that…

  13. Just a routine operation: a critical discussion.

    Science.gov (United States)

    McClelland, G; Smith, M B

    2016-05-01

    This article has summarised a critical discussion of the human factors that contributed to the death of a patient from a failure to respond appropriately to a 'can't intubate, can't ventilate' scenario. The contributory factors included the clinical team's inability to communicate, prioritise tasks and demonstrate effective leadership and assertive followership. The film Just a routine operation has now been in circulation for several years. When a system is designed and introduced with the intention of making a change to clinical practice, it can quickly become just another component of an organisation's architecture and complacency around its use can develop. This article has been written specifically for perioperative practitioners to renew the debate around the human factors that contribute to patient harm. By critically discussing Just a routine operation and attempting to review why the incident occurred, this article has attempted to emphasise that some of the conditions and behaviours that contributed to the death of Elaine Bromiley may be latent within our organisations and teams, and may continue to contribute to failures that affect patient safety.

  14. How Could a Beaver Start a War?

    Science.gov (United States)

    Millward, Robert

    2010-01-01

    Students gain a better understanding of war and economics when the variables come alive through stories, artifacts, and paintings. In this article, the author describes a short story about the fur trade which can generate lots of student questions about the fur economics, the Eastern Woodland Indians, trade artifacts, and war. The author also…

  15. Matematicas: Nivel A (Mathematics: Level A).

    Science.gov (United States)

    Duron, Dolores; And Others

    A teacher's manual was developed for an elementary level mathematics course in Spanish as part of an immersion program for English speaking children. The Level A manual is designed for kindergarten and grade 1 pupils. Teaching procedures, conceptual objectives, vocabulary, and structures are included. Activities are designed to teach either…

  16. A Reverse Shock in GRB 130427A

    CERN Document Server

    Laskar, T; Zauderer, B A; Margutti, R; Soderberg, A M; Chakraborti, S; Lunnan, R; Chornock, R; Chandra, P; Ray, A

    2013-01-01

    We present extensive radio and millimeter observations of the unusually bright GRB 130427A at z=0.340, spanning 0.67 to 12 days after the burst. Taken in conjunction with detailed multi-band UV, optical, NIR, and X-ray observations we find that the broad-band afterglow emission is composed of distinct reverse shock and forward shock contributions. The reverse shock emission dominates in the radio/millimeter and at 0.1 days in the UV/optical/NIR. We further find that the optical and X-ray data require a Wind circumburst environment, pointing to a massive star progenitor. Using the combined forward and reverse shock emission we find that the parameters of the burst are an isotropic kinetic energy of E_Kiso~2e53 erg, a mass loss rate of Mdot~3e-8 Msun/yr (for a wind velocity of 1,000 km/s), and a Lorentz factor at the deceleration time of Gamma(200s)~130. Due to the low density and large isotropic energy, the absence of a jet break to ~15 days places only a weak constraint on the opening angle of theta_j>2.5 deg...

  17. A Small Essay About a Big Boulevard

    Directory of Open Access Journals (Sweden)

    Elena Grigoryeva

    2015-08-01

    Full Text Available The essay presents the analogies of turning city borders and walls into boulevards and gardens through the examples of Moscow and Irkutsk. The main street of Irkutsk is viewed in a new light, as a boulevard. It is proposed to take into consideration the peculiarities of the four sense-parts of the street when working on design codes.

  18. With a little help from a friend.

    NARCIS (Netherlands)

    Schildwacht, R.; Bolhuis, S.; Broeders, A.

    2006-01-01

    The artcle describes the outcomes of a pilot study on professional development of teachers. The project was initiated by the school management. Nine teachers volunteered to work on their professional development in a programme consisting of: • meetings discussing on relevant teacher topics • meetin

  19. Quest for a Sustainable University: A Review

    Science.gov (United States)

    Amaral, Luís P.; Martins, Nelson; Gouveia, Joaquim B.

    2015-01-01

    Purpose: The paper aims to deliver a general review of the methods used to pursue the concept of a "sustainable university". Design/methodology/approach: The research was Internet based, and it included research papers, books, conference proceedings, technical reports and Internet Web sites. The review was divided in two main parts:…

  20. Death Ends a Life, not a Relationship

    DEFF Research Database (Denmark)

    2014-01-01

    In the final chapter, “Death Ends a Life, not a Relationship: objects as media on children’s graves”, Dorthe Refslund Christensen and Kjetil Sandvik investigate the relational affordances offered by objects as media in practices of death and commemoration on children’s graves. The authors argue t...

  1. A VORTEX MODEL OF A HELICOPTER ROTOR

    Directory of Open Access Journals (Sweden)

    Valentin BUTOESCU

    2009-06-01

    Full Text Available A vortex model of a helicopter rotor is presented. Each blade of the rotor has three degrees of freedom: flapping, lagging and feathering. The motions after each degree of freedom are also known for all blades. The blade is modelled as a thin vortex surface. The wakes are free fluid surfaces. A system of five equations are obtained: the first one is the integral equation of the lifting surface (rotor, the next three describe the wakes motion, and the last one relates the vortex strength on the wakes and the variation of vorticity on the rotor. A numerical solution of this system is presented. To avoid the singularities that can occur due to the complexity of vortex system, a desingularized model of the vortex core was adopted. A Mathcad worksheet containing the method has been written.The original contribution of the work. The calculation method of the motion of the wakes free vortex system, the development of the vortex cores in time and a new method to approximate the aerodynamic influence of remoted wake regions.

  2. [A strong man with a weak shoulder].

    Science.gov (United States)

    Henket, Marjolijn; Lycklama á Nijeholt, Geert J; van der Zwaal, Peer

    2013-01-01

    A 47-year-old former olympic athlete had pain and weakness of his left shoulder. There was no prior trauma. He had full range-of-motion and a scapular dyskinesia. There was atrophy of the trapezius and sternocleidomastoideus muscles. He was diagnosed with 'idiopathic neuritis of the accessorius nerve'.

  3. Designing for a Dollar a Day

    DEFF Research Database (Denmark)

    Kyng, Morten

    1988-01-01

    for independent end user design activities. I go on by presenting a set of "cheap tools" and techniques, including the use mockup's. This set covers the issues of establishing the possibility of alternatives, of creating visions of new and different uses of technology, and of designing computer support. A central...

  4. A Super Computer For a Super City

    Institute of Scientific and Technical Information of China (English)

    FRANCISCO; LITTLE

    2011-01-01

    It’s a gigantic construction site that stretches beyond the horizon. Blue and red heavy-duty trucks in endless lines trundle about beneath a gaggle of cranes hoisting steel. And all the while enormous ultramodern buildings,bearing the names of the largest local and international companies,rise from the earth.

  5. Decapitation: A Case for a Better Guillotine

    Science.gov (United States)

    2007-02-23

    to success. 30 Robert S. Litwak, “Regime Change or Change in a Regime,” in Proliferation of WMD in the Middle East, editor James A. Russell (New...Bush, The National Security Strategy of the United States of America (Washington D.C.: The White House, March 2006). 35 John King, David Ensor , Jamie

  6. A Report on A Christmas Carol

    Institute of Scientific and Technical Information of China (English)

    周志聪

    2010-01-01

    @@ Charles Dickens is generally considered the greatest English novelist of the Victorian period,as well as a vigorous social campaigner.His works are characterized by attacks on social evils,injustice and hypocrisy,and among which there is one that Dickens called his "little Christmas Book",that is A Christmas Carol.

  7. Quest for a Sustainable University: A Review

    Science.gov (United States)

    Amaral, Luís P.; Martins, Nelson; Gouveia, Joaquim B.

    2015-01-01

    Purpose: The paper aims to deliver a general review of the methods used to pursue the concept of a "sustainable university". Design/methodology/approach: The research was Internet based, and it included research papers, books, conference proceedings, technical reports and Internet Web sites. The review was divided in two main parts:…

  8. Marketing Education on a Shoestring: A Model.

    Science.gov (United States)

    Shreeve, William; And Others

    Few educators envision themselves as marketing or public relations experts, yet economic reality is forcing many academicians into these roles. Over the past four years, the Eastern Washington University Department of Education has developed a successful marketing model for educators. The model begins with a successful reform of department…

  9. Glomus jugulare (Type A: A case review

    Directory of Open Access Journals (Sweden)

    Vinod T Kandakure

    2012-01-01

    Full Text Available We report a glomus jugulare tumor in a 60 yrs old female; non diabetic, non hypertensive who presented with continuous pulsatile hissing tinnitus in right ear with progressive hearing impairment and fullness in the ear. Detailed history and examination with aid of investigations it turned out to be glomus jugulare, treated by surgical excision by post auricular hypotympanotomy approach.

  10. A Reverse Shock in GRB 160509A

    CERN Document Server

    Laskar, Tanmoy; Berger, Edo; Fong, Wen-fai; Margutti, Raffaella; Shivvers, Isaac; Williams, Peter K G; Kopac, Drejc; Kobayashi, Shiho; Mundell, Carole; Gomboc, Andreja; Zheng, WeiKang; Menten, Karl M; Graham, Melissa L; Filippenko, Alexei V

    2016-01-01

    We present the second multi-frequency radio detection of a reverse shock in a $\\gamma$-ray burst. By combining our extensive radio observations of the Fermi-LAT GRB 160509A at $z = 1.17$ up to $20$ days after the burst with Swift X-ray observations and ground-based optical and near-infrared data, we show that the afterglow emission comprises distinct reverse shock and forward shock contributions: the reverse shock emission dominates in the radio band at $\\lesssim10~$days, while the forward shock emission dominates in the X-ray, optical, and near-infrared bands. Through multi-wavelength modeling, we determine a circumburst density of $n_0\\approx10^{-3}~$cm$^{-3}$, supporting our previous suggestion that a low-density circumburst environment is conducive to the production of long-lasting reverse shock radiation in the radio band. We infer the presence of a large excess X-ray absorption column, $N_{\\rm H} \\approx 1.5\\times10^{22}~$cm$^{-2}$, and a high rest-frame optical extinction, $A_{\\rm V}\\approx3.4~$mag. We...

  11. Could a zygote be a human being?

    Science.gov (United States)

    Burgess, John

    2010-02-01

    This paper re-examines the question of whether quirks of early human foetal development tell against the view (conceptionism) that we are human beings at conception. A zygote is capable of splitting to give rise to identical twins. Since the zygote cannot be identical with either human being it will become, it cannot already be a human being. Parallel concerns can be raised about chimeras in which two embryos fuse. I argue first that there are just two ways of dealing with cases of fission and fusion and both seem to be available to the conceptionist. One is the Replacement View according to which objects cease to exist when they fission or fuse. The other is the Multiple Occupancy View - both twins may be present already in the zygote and both persist in a chimera. So, is the conceptionist position tenable after all? I argue that it is not. A zygote gives rise not only to a human being but also to a placenta - it cannot already be both a human being and a placenta. Neither approach to fission and fusion can help the conceptionist with this problem. But worse is in store. Both fission and fusion can occur before and after the development of the inner cell mass of the blastocyst - the entity which becomes the embryo proper. The idea that we become human beings with the arrival of the inner cell mass leads to bizarre results however we choose to accommodate fission and fusion.

  12. From a magnet to a heat pump

    DEFF Research Database (Denmark)

    Navickaité, Kristina; Neves Bez, Henrique; Engelbrecht, Kurt

    2016-01-01

    The magnetocaloric effect (MCE) is the thermal response of a magnetic material to an applied magnetic field. Magnetic cooling is a promising alternative to conventional vapor compression technology in near room temperature applications and has experienced significant developments over the last fi...

  13. Death ends a life, not a relationship

    DEFF Research Database (Denmark)

    2014-01-01

    In the final chapter, “Death Ends a Life, not a Relationship: objects as media on children’s graves”, Dorthe Refslund Christensen and Kjetil Sandvik investigate the relational affordances offered by objects as media in practices of death and commemoration on children’s graves. The authors argue t...

  14. Locating a circle on a sphere

    DEFF Research Database (Denmark)

    Brimberg, Jack; Juel, Henrik; Schöbel, Anita

    2003-01-01

    We consider the problem of locating a spherical circle with respect to existing facilities on a sphere, such that the sum of weighted distances between the circle and the facilities is minimized, or such that the maximum weighted distance is minimized. The problem properties are analyzed, and we ...

  15. Locating a circle on a sphere

    DEFF Research Database (Denmark)

    Brimberg, Jack; Juel, Henrik; Schöbel, Anita

    2007-01-01

    We consider the problem of locating a spherical circle with respect to existing facilities on a sphere, such that the sum of distances between the circle and the facilities is minimized or such that the maximum distance is minimized. The problem properties are analyzed, and we give solution proce...

  16. How Could a Beaver Start a War?

    Science.gov (United States)

    Millward, Robert

    2010-01-01

    Students gain a better understanding of war and economics when the variables come alive through stories, artifacts, and paintings. In this article, the author describes a short story about the fur trade which can generate lots of student questions about the fur economics, the Eastern Woodland Indians, trade artifacts, and war. The author also…

  17. A false explosion for a real intervention

    CERN Multimedia

    2006-01-01

    Together with their French and Swiss counterparts, the CERN Fire Brigade carried out a spectacular exercise in the LHCb cavern. It was designed to test the coordination of the fire and rescue services of the Organization's two Host States. Inside a temporary medical station set up above ground, the emergency teams deliver medical care to the injured before they are taken to hospital.An accident victim in the underground cavern about to be evacuated. 'I was taking a group of visitors on a tour of the LHCb cavern when there was a huge explosion and I suffered serious burns to the thorax. The rescue services arrived on the scene and I was taken to the medical station'. Fortunately, this is not an account of real events but a scenario given to one of 20 volunteer 'victims' who took part in a large-scale safety exercise in the LHCb cavern. On 26 September, the CERN Fire Brigade organised a spectacular exercise in collaboration with the CERN Medical Service, the Fire and Rescue Service (SDIS) of the Department of t...

  18. A step up for a few postdocs

    CERN Multimedia

    2000-01-01

    Dutch postdocs at the Netherlands Cancer Institute complained recently of their lack of research independance and poor career progress. As a result they are now getting a proper career structure. Other institutions should also tackle this problem before serious recruitment problems develop (1/2 p).

  19. A child with pica. A case presentation.

    Directory of Open Access Journals (Sweden)

    Lidia Rosa Pérez González

    2005-04-01

    Full Text Available This is a case of a 4 year old child who was brought to the provincial Pediatric Hospital because of faecal stones. Iron deficit and intestinal parasites were found . The patient received treatment for 6 months till the ingestion of stones disappeared with the control of the etiologic factors that caused it.

  20. A Reverse Shock in GRB 160509A

    Science.gov (United States)

    Laskar, Tanmoy; Alexander, Kate D.; Berger, Edo; Fong, Wen-fai; Margutti, Raffaella; Shivvers, Isaac; Williams, Peter K. G.; Kopač, Drejc; Kobayashi, Shiho; Mundell, Carole; Gomboc, Andreja; Zheng, WeiKang; Menten, Karl M.; Graham, Melissa L.; Filippenko, Alexei V.

    2016-12-01

    We present the second multi-frequency radio detection of a reverse shock in a γ-ray burst. By combining our extensive radio observations of the Fermi-Large Area Telescope γ-ray burst 160509A at z = 1.17 up to 20 days after the burst with Swift X-ray observations and ground-based optical and near-infrared data, we show that the afterglow emission comprises distinct reverse shock and forward shock contributions: the reverse shock emission dominates in the radio band at ≲10 days, while the forward shock emission dominates in the X-ray, optical, and near-infrared bands. Through multi-wavelength modeling, we determine a circumburst density of {n}0≈ {10}-3 {{cm}}-3, supporting our previous suggestion that a low-density circumburst environment is conducive to the production of long-lasting reverse shock radiation in the radio band. We infer the presence of a large excess X-ray absorption column, N H ≈ 1.5 × 1022 {{cm}}-2, and a high rest-frame optical extinction, A V ≈ 3.4 mag. We identify a jet break in the X-ray light curve at {t}{jet}≈ 6 {days}, and thus derive a jet opening angle of {θ }{jet}≈ 4^\\circ , yielding a beaming-corrected kinetic energy and radiated γ-ray energy of {E}{{K}}≈ 4× {10}50 erg and {E}γ ≈ 1.3× {10}51 erg (1-104 keV, rest frame), respectively. Consistency arguments connecting the forward shocks and reverse shocks suggest a deceleration time of {t}{dec} ≈ 460 s ≈ T 90, a Lorentz factor of {{Γ }}({t}{dec})≈ 330, and a reverse-shock-to-forward-shock fractional magnetic energy density ratio of {R}{{B}}\\equiv {ɛ }{{B},{RS}}/{ɛ }{{B},{FS}}≈ 8. Our study highlights the power of rapid-response radio observations in the study of the properties and dynamics of γ-ray burst ejecta.

  1. A Fat Higgs with a Magnetic Personality

    CERN Document Server

    Craig, Nathaniel; Thaler, Jesse

    2011-01-01

    We introduce a novel composite Higgs theory based on confining supersymmetric QCD. Supersymmetric duality plays a key role in this construction, with a "fat" Higgs boson emerging as a dual magnetic degree of freedom charged under the dual magnetic gauge group. Due to spontaneous color-flavor locking in the infrared, the electroweak gauge symmetry is aligned with the dual magnetic gauge group, allowing large Yukawa couplings between elementary matter fields and the composite Higgs. At the same time, this theory exhibits metastable supersymmetry breaking, leading to low-scale gauge mediation via composite messengers. The Higgs boson is heavier than in minimal supersymmetric theories, due to non-decoupling D-terms and a large F-term quartic coupling. This theory predicts quasi-stable TeV-scale pseudo-modulini, some of which are charged under standard model color, possibly giving rise to long-lived R-hadrons at the LHC.

  2. A cabeça voraz

    Directory of Open Access Journals (Sweden)

    Betty Mindlin

    1996-08-01

    Full Text Available o artigo focaliza um mito indígena sobre a cabeça voadora e voraz, registrado pela autora em vários grupos indígenas da Amazônia, como os Tupari, os Macurap, os Jabuti, os Aruá, os Sateré-Mawé. Cada versão do mito tem um enredo diferente, mas o tema intrigante é sempre o mesmo: a mutilação do corpo, a cabeça que se transforma ou cola-se num outro ser. Procura-se mergulhar no significado desse mito, ao qual Claude Lévi-Strauss dedicou boa parte de dois livros magistrais, A origem das maneiras da mesa e A oleira ciumenta, e que foi usado por Mário de Andrade no livro clássico sobre o herói brasileiro, Macunaína, uma das poucas obras de fição brasileira a se inspirar em temas e personagens míticos indígenas. O registro de campo desse mito é uma pequena ponta de um amplo trabalho de documentação da tradição e dos mitos indígenas brasileiros, que a autora vem realizando há alguns anos. A intenção, nesse texto, é compreender a riqueza do imaginário indígena brasileiro, insistir na necessidade de documentar culturas que são nossas contemporâneas e ainda bastante desconhecidas. A fição e a arte brasileiras poderiam ampliar muito o seu universo ao explorar e tentar compreender as raízes brasileiras que nos são dadas por mais de 200 povos indígenas do país. Também para os índios, escrever, contar, divulgar e usar nas próprias escolas os seus mitos é importante para reafirmar a identidade étnica e valorizar sua participação na sociedade brasileira.The article focuses an indian myth about a flying and voracious head, that was told to the author by several indian tribes from the Amazon, such as the Tupari, the Macurap, the Jabuti, the Aruá, the Sateré-Mawé. Each version has a different plot, but the intriguing theme is always the same: the mutilation of the body, a head that is transformed or attaches itself to another being. The essay delves into the meaning of this myth, to which Claude L

  3. A sun holiday is a sunburn holiday

    DEFF Research Database (Denmark)

    Petersen, Bibi; Thieden, Elisabeth; Philipsen, Peter Alshede

    2013-01-01

    Many people take holidays in sunny locations with the express aim of sunbathing. This may result in sunburn, which is a risk factor for skin cancer. We investigated 25 Danish sun seekers during a week's holiday in the Canary Islands. The percentage of body surface area with sunburn was determined......-specific UVR doses after adjustment for sun protection factor. Remarkably, we found that all volunteers sunburned at some point. The risk of sunburn correlated significantly with the adjusted body site-specific UVR dose. Furthermore, there was also a significant relationship between the daily UVR dose...... and percentage of body surface area with sunburn. Our study shows that holiday UVR exposure results in a high risk of sunburn, which potentially increases the risk of skin cancer. Possible protection by melanogenesis is insufficient to protect against sunburn during a 1-week sun holiday. Finally, our data...

  4. Education:a discipline or a field?

    Institute of Scientific and Technical Information of China (English)

    WANG Hongcai

    2007-01-01

    Historically,scholars have made unfailing efforts to position education as a standard science,but no solid success has been achieved regardless of the positivistic paradigm,quantitative approaches,or value-free neutral stances they adopted.In China,scholars have set up a so-called"three independency"standard for the scientific study of education,but it has been finally proved invalid in practice.As interdisciplines permeate the field of education,education experiences a crisis of being colonized.After serious rethinking,interdisciplines were widely believed to do more good than harm to education.Therefore,education is beginning to transform from a"colony"to an"empire".In this transformation,education finds it necessary to break the traditional disciplinary boundaries and make it a field in which interdisciplinary communication is contributory to the enrichment of scholarship.

  5. Workplace spirituality: A tool or a trend?

    Directory of Open Access Journals (Sweden)

    Philip J.W. Schutte

    2016-05-01

    Full Text Available Workplace spirituality is a construct widely discussed over the past few decades and it is a much-disputed inquiry field which is gaining the interest of practitioners and scholars. Some clarifications regarding concepts and definitions are necessary in order to structure and direct the current debate. The aim of this conceptual article is to gain a better understanding regarding the direction in which this field of study is progressing and to put the question on the table namely, whether workplace spirituality is only a new tool to be used in leadership development or is it a trend to be taken seriously? The results showed that this field has potential to further development. This article can be used as foundation for future studies within the knowledge area of practical theology.

  6. Is zucchini a phosphodiesterase or a ribonuclease?

    Science.gov (United States)

    Nureki, Osamu

    2014-01-01

    Zucchini (Zuc), a member of the phospholipase D (PLD) superfamily, is essential for the primary PIWI-interacting RNA (piRNA) biogenesis and the suppression of transposon expression, which are crucial for the genome integrity of germline cells. However, it has been ambiguous whether Zuc acts as a phosphodiesterase to produce phosphatidic acid (PA), the lipid signaling molecule, or as a nuclease. The recent three papers describing the crystal structures and functional analyses of fly and mouse Zuc proteins have elucidated that Zuc is a PLD family single-strand ribonuclease, not a phosphodiesterase, and functions in the maturation of primary piRNAs. This review will discuss in detail how the crystal structures clearly predict the function of Zuc, which is subsequently demonstrated by biochemical analysis to conclude the previous controversial discussion on the real function of Zuc.

  7. Is zucchini a phosphodiesterase or a ribonuclease?

    Directory of Open Access Journals (Sweden)

    Osamu Nureki

    2014-12-01

    Full Text Available Zucchini (Zuc, a member of the phospholipase D (PLD superfamily, is essential for the primary PIWI-interacting RNA (piRNA biogenesis and the suppression of transposon expression, which are crucial for the genome integrity of germline cells. However, it has been ambiguous whether Zuc acts as a phosphodiesterase to produce phosphatidic acid (PA, the lipid signaling molecule, or as a nuclease. The recent three papers describing the crystal structures and functional analyses of fly and mouse Zuc proteins have elucidated that Zuc is a PLD family single-strand ribonuclease, not a phosphodiesterase, and functions in the maturation of primary piRNAs. This review will discuss in detail how the crystal structures clearly predict the function of Zuc, which is subsequently demonstrated by biochemical analysis to conclude the previous controversial discussion on the real function of Zuc.

  8. GRB 130427A: A Nearby Ordinary Monster

    Science.gov (United States)

    Maselli, A.; Melandri, A.; Nava, L.; Mundell, C. G.; Kawai, N.; Campana, S.; Covino, S.; Cummings, J. R.; Cusumano, G.; Evans, P. A.; Ghirlanda, G.; Ghisellini, G.; Guidorzi, C.; Kobayashi, S.; Kuin, P.; La Parola, V.; Mangano, V.; Oates, S.; Sakamoto, T.; Serino, M.; Virgili, F.; Zhang, B.-B.; Barthelmy, S.; Beardmore, A.; Bernardini, M. G.; Bersier, D.; Burrows, D.; Calderone, G.; Capalbi, M.; Chiang, J.; D'Avanzo, P.; D'Elia, V.; De Pasquale, M.; Fugazza, D.; Gehrels, N.; Gomboc, A.; Harrison, R.; Hanayama, H.; Japelj, J.; Kennea, J.; Kopac, D.; Kouveliotou, C.; Kuroda, D.; Levan, A.; Malesani, D.; Marshall, F.; Nousek, J.; O'Brien, P.; Osborne, J. P.; Pagani, C.; Page, K. L.; Page, M.; Perri, M.; Pritchard, T.; Romano, P.; Saito, Y.; Sbarufatti, B.; Salvaterra, R.; Steele, I.; Tanvir, N.; Vianello, G.; Weigand, B.; Wiersema, K.; Yatsu, Y.; Yoshii, T.; Tagliaferri, G.

    2014-01-01

    Long-duration gamma-ray bursts (GRBs) are an extremely rare outcome of the collapse of massive stars and are typically found in the distant universe. Because of its intrinsic luminosity (L ˜ 3 × 1053 ergs per second) and its relative proximity (z = 0.34), GRB 130427A reached the highest fluence observed in the γ-ray band. Here, we present a comprehensive multiwavelength view of GRB 130427A with Swift, the 2-meter Liverpool and Faulkes telescopes, and by other ground-based facilities, highlighting the evolution of the burst emission from the prompt to the afterglow phase. The properties of GRB 130427A are similar to those of the most luminous, high-redshift GRBs, suggesting that a common central engine is responsible for producing GRBs in both the contemporary and the early universe and over the full range of GRB isotropic energies.

  9. Taming a flow with a string

    Science.gov (United States)

    Dorbolo, Stephane; Vandewalle, Nicolas; Darbois-Texier, Baptiste; Grasp Team

    2015-11-01

    The speed of a liquid jet out of a pipe is a function of the flow and of the pipe section. Consequently, the trajectory of the liquid jet is governed by the flow and the geometry of the pipe (section and angle with respect to the gravity). We propose to regulate the trajectory of the jet by introducing a flexible wire in the outflow. According to the flow and according to the length of the wire, three regimes can be obtained: (i) no change, (ii) the control of the trajectory, (iii) the guide of the jet direct downwards the vertical. We also show that the wire acts as a free pipe. FNRS is thank for financial support.

  10. Gingivectomía a bisel externo

    Directory of Open Access Journals (Sweden)

    Teresita Burgos Fuentes

    2014-06-01

    Full Text Available ResumenEl propósito de este reporte es describir el alargamiento coronario como tratamiento estético periodontal. La gingivectomía es un tratamiento quirúrgico antiguo. La indicación para la gingivectomía es la eliminación completa de la bolsa periodontal, hiperplasias. El diseño fisiológico del margen libre gingival por el medio quirúrgico debe ser tomado en consideración. Se reporta un caso clínico de un paciente masculino de 32 años de edad que exhibe gran cantidad de encía cuando sonríe. El logro de resultados estéticos excelentes en la terapia no es una cuestión de azar, es algo planificado antes de iniciar el tratamiento. (Duazary 2008; 125-128AbstractThe purpose of this report is to describe the external level gingivectomy as a periodontal esthetic treatment; the gingivectomy is the oldest surgical approach in periodontal therapy. Indication for performance of the gingivectomy is the complete elimination of the periodontal pocket and hyperplasia gingival. The physiologic design of the free gingival margin by surgical means, gingivoplasty, must be taken under consideration. A clinic case is been reported, a 32 years old with a big amount of gum tissue when she smiles. The achievement of excellent esthetics results on a therapy is not a matter of luck, must be into the treatment plan before starting this one.Key words: periodontal treatment; gingivectomy; gingival hyperplasia.

  11. A Department Chair: A Life Guard without a Life Jacket

    Science.gov (United States)

    Gonaim, Faiza

    2016-01-01

    Leadership in higher education is fundamental for institutional development and sustainability in today's rapidly changing world. The academic department is a fundamental unit for transforming the university's visions and goals into reality. The vigorous contribution of each department, which depends in turn largely on the effectiveness of the…

  12. A Clubhouse Is a Clubhouse Is a Clubhouse.

    Science.gov (United States)

    Zhao, Y.; Mishra, P.; Girod, M.

    2000-01-01

    Describes the design, development, and implementation of a technology-rich after-school program for middle schools called KLICK (Kids Learning in Computer Klubhouses). Topics include learning activities; learning environments; constructivism; social and organizational arrangements; collaboration; the culture of schooling; and issues of innovation,…

  13. Biodiesel: A fuel, a lubricant, and a solvent

    Science.gov (United States)

    Biodiesel is well-known as a biogenic alternative to conventional diesel fuel derived from petroleum. It is produced from feedstocks such as plant oils consisting largely of triacylglycerols through transesterification with an alcohol such as methanol. The properties of biodiesel are largely compet...

  14. Parenting a Child with a Learning Disability: A Qualitative Approach

    Science.gov (United States)

    Fernández-Alcántara, Manuel; Correa-Delgado, Cayetana; Muñoz, Ángela; Salvatierra, María Teresa; Fuentes-Hélices, Tadeo; Laynez-Rubio, Carolina

    2017-01-01

    The present study describes experiences associated with parenting children diagnosed with learning disabilities. Parents whose children were diagnosed with Attention Deficit Hyperactivity Disorder, dyslexia/language problems, and Asperger syndrome, related to poor performance at school, took part in the study. A qualitative study design was…

  15. Determining a rotation of a tetrahedron from a projection

    CERN Document Server

    Gardner, Richard J; Theobald, Thorsten

    2011-01-01

    The following problem, arising from medical imaging, is addressed: Suppose that $T$ is a known tetrahedron in $\\R^3$ with centroid at the origin. Also known is the orthogonal projection $U$ of the vertices of the image $\\phi T$ of $T$ under an unknown rotation $\\phi$ about the origin. Under what circumstances can $\\phi$ be determined from $T$ and $U$?

  16. Meeting a Patient as a Singular Event: A Philosophical Reflection

    Directory of Open Access Journals (Sweden)

    IGNAAS DEVISCH

    2010-01-01

    Full Text Available Although much research has been dedicated to describing the ethical and communicative conditions of the encounter between a health care professional and a patient, in fact we know very little of the encounter itself, nor of the concept of the identity of the subjects they implicitly fall back upon. By contrast, in this paper we want to start from the fundamental question: what happens when two people meet in a patient's room? How do we take hold of the uncertainty and unpredictability in every new encounter? To address this lack we turn to the work of the French Philosopher Jean-Luc Nancy and his notion of the singular and its importance for the encounter in the healthcare setting. Nancy examines the philosophical presuppositions inherent in the ways we speak of human identity. We explain his analysis of 'together' or 'with', and of 'singularity'. Then we apply his idea of singular identity to shed a new light on the encounter mentioned above.

  17. A Year To Make a Difference

    Science.gov (United States)

    Howell, J. Emory

    1999-01-01

    Secondary School Feature Articles * Animating Reactions: A Low-Cost Activity for Particle Conceptualization at the Secondary Level, by Robert W. Milne, p 50. * The Gravity of the Situation, by Damon Diemente, p 55. You must be the change you wish to see in the world. Mahatma Ghandi The beginning of a new year always brings with it a feeling of anticipation, a desire to achieve new goals, and a certain urgency to accomplish. Beginning the last year of the 1900s seems somehow to amplify these feelings. This week I was reminded twice of the challenge that lies in focusing on those things that we can change and not being fettered by those we cannot. The first example occurred in my office on a Monday afternoon. A young woman was considering the choice between entering graduate school or seeking a high school teaching position. After approximately 10 years in the workforce, she had entered college and was now within a semester of graduation. While pursuing her studies she had served as a substitute teacher in her home community, believing the experience would affirm her longstanding desire to teach. The behavioral characteristics of some students seemed to be at odds with her memories of high school only a dozen years earlier. Now she was questioning whether she could make a difference in young lives or if she should give up the idea of teaching in high school in favor of graduate degrees in her discipline, which would lead to a career in post-secondary education. Although I assured her that she could indeed have a great impact on high school students, I empathized with the concern she was feeling. The second example occurred the same day, in a class for chemistry majors who are preparing to teach high school chemistry. While considering the importance of performance assessment, with discussion centered on a JCE article ((a href="//1998/jan/abs64.html">Rasp, S. L. J. Chem. Educ. 1998, 75, 64-66), one class member asked why we only discussed and read about what teachers

  18. A strain gauge

    DEFF Research Database (Denmark)

    2017-01-01

    The invention relates to a strain gauge of a carrier layer and a meandering measurement grid (101) positioned on the carrier layer, wherein the measurement grid comprises a number of measurement grid sections placed side by side with gaps in between, and a number of end loops (106) interconnecting...... the measurement grid sections at their ends. The end loops at both ends of the measurement grid extend a length (L, 500) in the axial direction in millimetres of a factor times a ratio between a width of a grid section and the gap distance, wherein the factor is larger or equal to 1.5. The invention further...

  19. A geomechanical model of a sinkhole formation

    Science.gov (United States)

    Danchiv, Alexandru; Zamfirescu, Florian; Mocuta, Marius; Popa, Iulian; Zlibut, Alexandru; Huggenberger, Peter; Zechner, Eric; Dresmann, Horst; Scheidler, Stefan; Wiesmeier, Stefan

    2016-04-01

    On December 2010 a sinkhole was suddenly formed close to the eastern flank of Ocna-Mures salt dome. Soon after the collapse the sinkhole was filled with brine forming a salt lake called Plus Lake. The total volume of sinkhole of about 100000 m3 remained constant since February 2011. The Ocna Mures salt dome is situated on the western border of the Transylvanian basin (Romania) and has been exploited for a long time. The ceilings of some shallow mine chambers are now collapsed and filled with brine. Along the eastern flank of the salt dome there is a disturbed zone due to diapirism. Its presence is suggested by the strong fragmentation of rock in the boreholes drilled along the salt-sterile contact, as it resulted from the low values of RQD index. The sinkhole is probably due to a pressure increase along the diapir flank. The causes of this sudden increase of pressure are not well known. Most probably it is due to the damage of the tubing of a flank borehole as mentioned in a technical report of the exploiting company. The injected fresh water expelled through the breaches of the damaged borehole and, due to the high pressure flushed up the crushed material of the disturbed zone. In order to better understand the setting up of the Plus Lake joint research efforts were performed by teams from Bucharest and Basel Universities since 2013. For the geomechanical approach a numerical model was performed using the Flac 7.0 code. In a first stage the creep behavior of salt was analyzed considering a Norton creep law. It resulted that after 100 years the salt reached equilibrium, the creep could be neglected and in a first approximation mechanical equilibrium could be analyzed considering only an elasto-plastic behavior of both the salt and the sterile. For both the salt and the surrounding sedimentary rocks the Mohr-Coulomb criterion was considered. The properties of sterile rocks were estimated following the GSI system. Due to poor rock quality the strength parameters have

  20. [Utilities: a solution of a decision problem?].

    Science.gov (United States)

    Koller, Michael; Ohmann, Christian; Lorenz, Wilfried

    2008-01-01

    Utility is a concept that originates from utilitarianism, a highly influential philosophical school in the Anglo-American world. The cornerstone of utilitarianism is the principle of maximum happiness or utility. In the medical sciences, this utility approach has been adopted and developed within the field of medical decision making. On an operational level, utility is the evaluation of a health state or an outcome on a one-dimensional scale ranging from 0 (death) to 1 (perfect health). By adding the concept of expectancy, the graphic representation of both concepts in a decision tree results in the specification of expected utilities and helps to resolve complex medical decision problems. Criticism of the utility approach relates to the rational perspective on humans (which is rejected by a considerable fraction of research in psychology) and to the artificial methods used in the evaluation of utility, such as Standard Gamble or Time Trade Off. These may well be the reason why the utility approach has never been accepted in Germany. Nevertheless, innovative concepts for defining goals in health care are urgently required, as the current debate in Germany on "Nutzen" (interestingly translated as 'benefit' instead of as 'utility') and integrated outcome models indicates. It remains to be seen whether this discussion will lead to a re-evaluation of the utility approach.

  1. A microtube viscometer with a thermostat

    Energy Technology Data Exchange (ETDEWEB)

    Silber-Li, Z.H. [LNM, Institute of Mechanics, Chinese Academy of Sciences, 15, Bei Si Huan Xi Lu, 100080, Beijing (China); Tan, Y.P. [LNM, Institute of Mechanics, Chinese Academy of Sciences, 15, Bei Si Huan Xi Lu, 100080, Beijing (China); Shanghai Institute of Applied Mathematics and Mechanics, Shanghai University, 200072, Shanghai (China); Weng, P.F. [Shanghai Institute of Applied Mathematics and Mechanics, Shanghai University, 200072, Shanghai (China)

    2004-04-01

    The viscometer presented in this paper is suitable for measuring the viscosity of liquids in micro-litre quantities. It consists of a micro-flow experimental system with a thermostat. Using the measurements of the flow rates and pressure drops of a liquid passing through a microtube, the liquid's viscosity can be calculated from on Hagen-Poiseuille theory. After calibration, the viscometer was used to measure viscosities of deionized water and ethyl alcohol at temperatures ranging from 0 to 40 C. For both test liquids, the relative deviation of the measured values from those quoted in the literature (obtained using other viscometers) was less than 2.6%. The relative uncertainty of the experimental system was reduced to {+-}1.8% using the relative measuring method. Due to the micro-scale of the test section, only a micro-litre quantity of liquid is needed for a test; this is a potential advantage for measurement of bio-liquid viscosities. (orig.)

  2. Birth of a theorem a mathematical adventure

    CERN Document Server

    Villani, Cédric

    2015-01-01

    This man could plainly do for mathematics what Brian Cox has done for physics" (Sunday Times). What goes on inside the mind of a rock-star mathematician? Where does inspiration come from? With a storyteller's gift, Cedric Villani takes us on a mesmerising journey as he wrestles with a new theorem that will win him the most coveted prize in mathematics. Along the way he encounters obstacles and setbacks, losses of faith and even brushes with madness. His story is one of courage and partnership, doubt and anxiety, elation and despair. We discover how it feels to be obsessed by a theorem during your child's cello practise and throughout your dreams, why appreciating maths is a bit like watching an episode of Columbo, and how sometimes inspiration only comes from locking yourself away in a dark room to think. Blending science with history, biography with myth, Villani conjures up an inimitable cast of characters including the omnipresent Einstein, mad genius Kurt Godel, and Villani's personal hero, John Nash. Bir...

  3. A Transmedia Topology of 'Making a Murderer'

    Directory of Open Access Journals (Sweden)

    Alan Hook

    2016-12-01

    Full Text Available This article constructs a transmedia topology of the Making a Murderer text, demonstrating influences of various forms of documentary, interactive gaming culture, and post-digital writing on the series itself as well as on the paratextual cloud of works that grew up around it. Here we define transmedia topology as a tracing of what we could call the geography of the text, as defined by its features and boundaries (or lack thereof. We will discuss the intentionality of the series creators, as well as the emergence of a transmedial textuality that is owed largely to audiences and the textual terrain. The Making a Murderer series thus becomes the basis for a larger transmedia narrative that sprawls across social-digital networks, a pastiche of multifarious public reaction and unsanctioned investigation.The article maps the ecologies of interaction, participation and creation with and of the text by the audience to map the thresholds of the transmedial text and investigate new approaches to analysing transmedial work in the context of non-fiction media forms.

  4. A reductive coupling strategy towards ripostatin A

    Directory of Open Access Journals (Sweden)

    Kristin D. Schleicher

    2013-07-01

    Full Text Available Synthetic studies on the antibiotic natural product ripostatin A have been carried out with the aim to construct the C9−C10 bond by a nickel(0-catalyzed coupling reaction of an enyne and an epoxide, followed by rearrangement of the resulting dienylcyclopropane intermediate to afford the skipped 1,4,7-triene. A cyclopropyl enyne fragment corresponding to C1−C9 has been synthesized in high yield and demonstrated to be a competent substrate for the nickel(0-catalyzed coupling with a model epoxide. Several synthetic approaches toward the C10−C26 epoxide have been pursued. The C13 stereocenter can be set by allylation and reductive decyanation of a cyanohydrin acetonide. A mild, fluoride-promoted decarboxylation enables construction of the C15−C16 bond by an aldol reaction. The product of this transformation is of the correct oxidation state and potentially three steps removed from the targeted epoxide fragment.

  5. A Complete Scheme for a Muon Collider

    CERN Document Server

    Palmer, Robert B; Fernow, Richard C; Gallardo, Juan Carlos; Kirk, Harold G; Alexahin, Yuri; Neuffer, David; Kahn, Stephen Alan; Summers, Don J

    2007-01-01

    A complete scheme for production, cooling, acceleration, and ring for a 1.5 TeV center of mass muon collider is presented, together with parameters for two higher energy machines. The schemes starts with the front end of a proposed neutrino factory that yields bunch trains of both muon signs. Six dimensional cooling in long-period helical lattices reduces the longitudinal emittance until it becomes possible to merge the trains into single bunches, one of each sign. Further cooling in all dimensions is applied to the single bunches in further helical lattices. Final transverse cooling to the required parameters is achieved in 50 T solenoids.

  6. A case study, Bagnoli: a difficult transition

    Directory of Open Access Journals (Sweden)

    Maria Antonietta Selvaggio

    2015-01-01

    In this research work we intend to verify how a particular physical-spatial dimension has influenced the social relations and the same identities of the people and their “community”, how we can delineate the perception and the performance of a urban transformation largely failed, and which contribution the citizens of Bagnoli can give to the urban design through their own imaginary and meanings they ascribe to their environment (Lynch 1960. In this sense, the study aim at giving a contribution to the participative practice, that up to now is out of the transition dynamics.

  7. A woman with a dangling digit.

    Science.gov (United States)

    Roesch, Alexander; Kinner, Bernd; Schaechinger, Ulrich; Obermann, Ellen C; Landthaler, Michael; Hohenleutner, Ulrich

    2007-11-01

    Ainhum (dactylolysis spontanea) is a distinct clinical and radiological disorder of dark-skinned people characterized by a progressive development of a constricting band encircling the toe which usually results in spontaneous amputation. Ainhum mainly occurs in African natives, but in times of global migration and tourism, Ainhum is likely to be more often encountered outside Africa. Even though the clinical presentation can mimic more common entities such as arthritis and trauma, the correct diagnosis and treatment is easy if one knows this unusual entity.

  8. Tesla - A Flash of a Genius

    Science.gov (United States)

    Teodorani, M.

    2005-10-01

    This book, which is entirely dedicated to the inventions of scientist Nikola Tesla, is divided into three parts: a) all the most important innovative technological creations from the alternate current to the death ray, Tesla research in fundamental physics with a particular attention to the concept of "ether", ball lightning physics; b) the life and the bright mind of Nikola Tesla and the reasons why some of his most recent findings were not accepted by the establishment; c) a critical discussion of the most important work by Tesla followers.

  9. Dialog between a Lexicographer and a Translator

    Directory of Open Access Journals (Sweden)

    Mark Kit

    2015-06-01

    Full Text Available Dialog between a Lexicographer and a Translator The discussion between the authors of the paper concerns the most pressing issues encountered in natural language semantics, as well as in corpus linguistics and computational linguistics. A broad range of knowledge, allowing linguists and information scientists to work together, is required in these areas. The paper describes some primary problems of human and machine translation caused by gaps between different fields of knowledge. The authors suggest that interdisciplinary approach is required when it comes to contrastive studies in linguistics.

  10. A certain ambiguity a mathematical novel

    CERN Document Server

    Suri, Gaurav

    2010-01-01

    While taking a class on infinity at Stanford in the late 1980s, Ravi Kapoor discovers that he is confronting the same mathematical and philosophical dilemmas that his mathematician grandfather had faced many decades earlier--and that had landed him in jail. Charged under an obscure blasphemy law in a small New Jersey town in 1919, Vijay Sahni is challenged by a skeptical judge to defend his belief that the certainty of mathematics can be extended to all human knowledge--including religion. Together, the two men discover the power--and the fallibility--of what has long been considered the pinn

  11. Aproximaciones a la Econometría

    OpenAIRE

    Espasa, Antoni

    1994-01-01

    En la concepción de la Econometría pueden adoptarse básicamente dos tipos de enfoques, que corresponden a dos formas distintas de concebir esta disciplina. Esta nota se hace eco de los comentarios críticos que la orientación econométrica basada en el supuesto de que las relaciones económicas son exactas ha recibido en la literatura, y se alinea en la corriente econométrica que se ha venido desarrollando a partir del trabajo pionero de Haavelmo (1944). Sobre esta publicación se puede decir, ut...

  12. Education of a college president: a memoir

    Energy Technology Data Exchange (ETDEWEB)

    Killian, J.R. Jr.

    1985-01-01

    The reviewer finds Killian's book, The Education of a College President: A Memoir, to be an interesting counterpoint to Kamen's memoir of the political side of the nuclear age. Killian describes his World War II experiences at the Massachusetts Institute of Technology, where a concentration of research scientists worked in harmony in contrast to the situation in California. Killian focuses on the institutional side of cooperation between the university, industry, and the military. The reviewer, who faults Kamen for his claustrophobic approach, expresses disappointment with Killian's impersonal approach.

  13. Locating a circle on a sphere

    DEFF Research Database (Denmark)

    Brimberg, Jack; Juel, Henrik; Schöbel, Anita

    2007-01-01

    We consider the problem of locating a spherical circle with respect to existing facilities on a sphere, such that the sum of distances between the circle and the facilities is minimized or such that the maximum distance is minimized. The problem properties are analyzed, and we give solution...... procedures. When the circle to be located is restricted to be a great circle, some simplifications are possible. The models may be used in preliminary studies on the location of large linear facilities on the earth's surface, such as superhighways, pipelines, and transmission lines, or in totally different...

  14. A ribozyme transcribed by a ribozyme

    DEFF Research Database (Denmark)

    Bentin, Thomas

    2011-01-01

    Prominent current ideas on how life emerged on Earth include an RNA world hypothesis in which RNA performed informational as well as catalytic functions in the absence of both DNA and protein. Demonstration of a self-replicative system based on ribonucleic acid polymers as both information carriers...... and catalysts would lend support to such a scenario. A pivotal component of this system would be an RNA dependent RNA polymerase ribozyme capable of replicating its own RNA gene. Recent work from the Holliger group at the Laboratory for Molecular Biology in Cambridge has provided synthetic ribozymes1 that just...

  15. A mathematical model for a gaming community

    CERN Document Server

    Breban, Romulus

    2016-01-01

    We consider a large community of individuals who mix strongly and meet in pairs to bet on a coin toss. We investigate the asset distribution of the players involved in this zero-sum repeated game. Our main result is that the asset distribution converges to the exponential distribution, irrespective of the size of the bet, as long as players can never go bankrupt. Analytical results suggests that the exponential distribution is a stable fixed point for this zero-sum repreated game. This is confirmed in numerical experiments.

  16. Guide for a typewriter

    Science.gov (United States)

    Dubois, R. D.; Pinson, G. T. (Inventor)

    1976-01-01

    The invention relates to accessories for typewriters, and more particularly to an improved guide for use in aligning a sheet of paper preparatory to an application of typed indicia to selected spaces. The device includes an aligning plate pivotally mounted on a line guide having formed therein a plurality of aligned apertures. The plate is so positioned that an aperture is positioned immediately above a target area for a type slug so that a slug will imprint a character in selected spaces.

  17. A Planck Vacuum Cosmology

    Directory of Open Access Journals (Sweden)

    Daywitt W. C.

    2009-04-01

    Full Text Available Both the big-bang and the quasi-steady-state cosmologies originate in some type of Planck state. This paper presents a new cosmological theory based on the Planck- vacuum negative-energy state, a state consisting of a degenerate collection of negative- energy Planck particles. A heuristic look at the Einstein field equation provides a con- vincing argument that such a vacuum state could provide a theoretical explanation for the visible universe.

  18. The information a history, a theory, a flood

    CERN Document Server

    Gleick, James

    2011-01-01

    Winner of the Royal Society Winton Prize for Science Books 2012, the world's leading prize for popular science writing. We live in the information age. But every era of history has had its own information revolution: the invention of writing, the composition of dictionaries, the creation of the charts that made navigation possible, the discovery of the electronic signal, the cracking of the genetic code. In 'The Information' James Gleick tells the story of how human beings use, transmit and keep what they know. From African talking drums to Wikipedia, from Morse code to the 'bit', it is a fascinating account of the modern age's defining idea and a brilliant exploration of how information has revolutionised our lives.

  19. A Narrative in Search of a Methodology.

    Science.gov (United States)

    Treloar, Anna; Stone, Teresa Elizabeth; McMillan, Margaret; Flakus, Kirstin

    2015-07-01

    Research papers present us with the summaries of scholars' work; what we readers do not see are the struggles behind the decision to choose one methodology over another. A student's mental health portfolio contained a narrative that led to an exploration of the most appropriate methodology for a projected study of clinical anecdotes told by nurses who work in mental health settings to undergraduates and new recruits about mental health nursing. This paper describes the process of struggle, beginning with the student's account, before posing a number of questions needing answers before the choice of the most appropriate methodology. We argue, after discussing the case for the use of literary analysis, discourse analysis, symbolic interactionism, hermeneutics, and narrative research, that case study research is the methodology of choice. Case study is frequently used in educational research and is sufficiently flexible to allow for an exploration of the phenomenon. © 2014 Wiley Periodicals, Inc.

  20. A stringy cloak for a classical singularity

    Energy Technology Data Exchange (ETDEWEB)

    Dabholkar, Atish [Department of Theoretical Physics, Tata Institute of Fundamental Research, Homi Bhabha Road, Mumbai 400005 (India); Kallosh, Renata [Institute for Theoretical Physics, Department of Physics, Stanford University, Stanford, CA 94305 (United States); Maloney, Alexander [Institute for Theoretical Physics, Department of Physics, Stanford University, Stanford, CA 94305 (United States) and Theory Group, Stanford Linear Accelerator Center, 2575 Sand Hill Rd, Menlo Park, CA 94025 (United States)]. E-mail: maloney@slac.stanford.edu

    2004-12-01

    We consider a class of 4D supersymmetric black hole solutions, arising from string theory compactifications, which classically have vanishing horizon area and singular space-time geometry. String theory motivates the inclusion of higher derivative terms, which convert these singular classical solutions into regular black holes with finite horizon area. In particular, the supersymmetric attractor equations imply that the central charge, which determines the radius of the AdS{sub 2} x S{sup 2} near horizon geometry, acquires a non-vanishing value due to quantum effects. In this case quantum corrections to the Bekenstein-Hawking relation between entropy and area are large. This is the first explicit example where stringy quantum gravity effects replace a classical null singularity by a black hole with finite horizon area. (author)

  1. Gingivectomía a bisel externo

    OpenAIRE

    Teresita Burgos Fuentes; Diana Marcela Palomino Romero; Antonio Díaz Caballero

    2014-01-01

    ResumenEl propósito de este reporte es describir el alargamiento coronario como tratamiento estético periodontal. La gingivectomía es un tratamiento quirúrgico antiguo. La indicación para la gingivectomía es la eliminación completa de la bolsa periodontal, hiperplasias. El diseño fisiológico del margen libre gingival por el medio quirúrgico debe ser tomado en consideración. Se reporta un caso clínico de un paciente masculino de 32 años de edad que exhibe gran cantidad de encía cuando sonríe. ...

  2. A wave lab inside a coaxial cable

    Science.gov (United States)

    Serra, João M.; Brito, Miguel C.; Alves, J. Maia; Vallera, A. M.

    2004-09-01

    The study of electromagnetic wave propagation in a coaxial cable can be a powerful approach to the study of waves at an undergraduate level. This study can explore different experimental situations, going from those where the finite velocity of propagation must be considered (distributed or transmission line behaviour), to those where this velocity may be considered infinite (lumped behaviour). We believe that the student observation of the existence of these two regimes can be important for the understanding of wave phenomena in general. In this work we show that this can be achieved using low-cost equipment and a set of quite simple experiments, such as the measurement of wave propagation velocity or the study of standing waves and resonance. The results obtained in a coherent set of selected experiments are discussed.

  3. Can a Humean be a Contractarian?

    Directory of Open Access Journals (Sweden)

    Robert Sugden

    2009-01-01

    Full Text Available In this paper I argue, contrary to Hartmut Kliemt, that it is possible to be both a Humean and, in James Buchanan's sense, a contractarian. Hume sees principles of justice and political allegiance not as actual or hypothetical products of explicit agreement, but as conventions that have emerged spontaneously. However, it is fundamental to Hume's analysis that conventions are mutually advantageous, and hence cognate with agreements. The core idea in Buchanan's contractarianism is that the proper role of government is to implement voluntary exchanges between individuals, not to define and maximise a unified conception of social welfare. Although real politics cannot be based entirely on unanimous agreement, the voluntary exchange approach provides a valuable structure for normative economics.

  4. A thing finished is a thing dead

    DEFF Research Database (Denmark)

    Baumeister, Ruth

    2014-01-01

    The article gives a general overview of Asger Jorn´s position in architecture. Besides his theoretical stands, it exemplifies his position by showing the artist´s private house and garden in Albissola, Italy....

  5. A teahouse in a tea garden

    OpenAIRE

    Macfarlane, Alan

    2004-01-01

    The Japanese place tea at the centre of their social and ceremonial life. In this beautiful tea garden in Kyoto, the tea mistress makes tea and offers it to Alan Macfarlane, who talks a little about its role in history.

  6. A blackbody is not a blackbox

    CERN Document Server

    Smerlak, Matteo

    2010-01-01

    We discuss carefully the blackbody approximation, stressing what it is (a limit case of radiative transfer), and what it is not (the assumption that the body is perfectly absorbing, i.e. black). Furthermore, we derive the Planck spectrum without enclosing the field in a box, as is done in most textbooks. Athough convenient, this trick conceals the nature of the idealization expressed in the concept of a blackbody: first, the most obvious examples of approximate blackbodies, stars, are definitely not enclosed in boxes; second, the Planck spectrum is continuous, while the stationary modes of radiation in a box are discrete. Our derivation, although technically less elementary, is conceptually more consistent, and brings the opportunity to introduce to students the important concept of local density of states, via the resolvent formalism.

  7. A blackbody is not a blackbox

    Science.gov (United States)

    Smerlak, Matteo

    2011-09-01

    We discuss carefully the blackbody approximation, stressing what it is (a limit case of radiative transfer), and what it is not (the assumption that the body is perfectly absorbing, namely black). Furthermore, we derive the Planck spectrum without enclosing the field in a box, as is done in most textbooks. Although convenient, this trick conceals the nature of the idealization expressed in the concept of a blackbody: first, the most obvious examples of approximate blackbodies, stars, are definitely not enclosed in boxes; second, the Planck spectrum is continuous, while the stationary modes of radiation in a box are discrete. Our derivation, although technically less elementary, is conceptually more consistent, and brings the opportunity to introduce to advanced undergraduate and graduate students the important concept of the local density of states via the resolvent formalism.

  8. Regenerating a kidney in a lymph node.

    Science.gov (United States)

    Francipane, Maria Giovanna; Lagasse, Eric

    2016-10-01

    The ultimate treatment for end-stage renal disease (ESRD) is orthotopic transplantation. However, the demand for kidney transplantation far exceeds the number of available donor organs. While more than 100,000 Americans need a kidney, only 17,000 people receive a kidney transplant each year (National Kidney Foundation's estimations). In recent years, several regenerative medicine/tissue engineering approaches have been exploited to alleviate the kidney shortage crisis. Although these approaches have yielded promising results in experimental animal models, the kidney is a complex organ and translation into the clinical realm has been challenging to date. In this review, we will discuss cell therapy-based approaches for kidney regeneration and whole-kidney tissue engineering strategies, including our innovative approach to regenerate a functional kidney using the lymph node as an in vivo bioreactor.

  9. Life of a Tooth: A Visual Timeline

    Medline Plus

    Full Text Available ... Dentist Your Family's Oral Health About the AGD Dental care and oral health information you need from ... Reference Learn more Seniors' Oral Health What is Dental Amalgam (Silver Filling)? What is a Composite Resin ( ...

  10. Umbanda: entre a cruz e a encruzilhada

    Directory of Open Access Journals (Sweden)

    LÍSIAS NOGUEIRA NEGRÃO

    1993-12-01

    Full Text Available O artigo considera a umbanda, religião afro-brasileira de constituição recente, como estando dividida entre os apelos de suas raízes negras e os atrativos legitimadores da adoção dos princípios éticos cristãos. Embora pouco racionalizada e postulando uma visão de mundo predominantemente encantada, vem crescentemente moralizando-se a partir, sobretudo, das influências do ideal kardecista da caridade. Tal incorporação não é, contudo, linear, mas reinterpretada a partir da vivência concreta de seus agentes e moderada pela necessidade da cobrança por serviços religiosos prestados e pela "demanda", concepção mágica de conflito inter-individual.

  11. What Makes a Wetland a Wetland?

    Science.gov (United States)

    Naturescope, 1986

    1986-01-01

    Provides descriptions of and activities about various kinds of wetlands. Contains seven learning activities ranging from creating wetland scenes with picture cutouts to actually exploring a wetland. Includes reproducible handouts and worksheets for several of the activities. (TW)

  12. Pseudomyrmex nigropilosa: A Parasite of a Mutualism.

    Science.gov (United States)

    Janzen, D H

    1975-05-30

    Pseudomyrmex nigropilosa is a parasite ofthe ant-acacia mutualism in Central America in that it harvests the resources of swollen-thorn acacias but does not protect the acacias. In the process, it also lowers the rate of occupation by the obligate acacia-ants, species of ants that do protect swollen-thorn acacias. Tenancy ofan acacia by P. nigropilosa must be temporary, since the unoccupied plant is shortly killed by herbivores or competing plants, or is taken over by obligate acacia-ants. As expected of a species of short-lived ant, a P. nigropilosa colony produces reproductives earlier in the life of the colony and maintains fewer grams of workers per gram of brood than does a colony of the long-lived obligate acacia-ants.

  13. Packing a cake into a box

    CERN Document Server

    Skopenkov, Mikhail

    2010-01-01

    Given a cake in form of a triangle and a box that fits the mirror image of the cake, how to cut the cake into a minimal number of pieces so that it can be put into the box? The cake has an icing, so that we are not allowed to put it into the box upside down. V.G. Boltyansky asked this question in 1977 and showed that three pieces always suffice. In this paper we provide examples of cakes that cannot be cut into two pieces to put into the box. This shows that three is the answer to V.G. Boltyansky's question. Also we give examples of cakes which can be cut into two pieces.

  14. A Subdermal Osteochondroma in a Young Girl

    Science.gov (United States)

    Correa, Hernan

    2017-01-01

    Osteochondromas are common benign tumors of cartilage and bone. They are usually found as contiguous bone with a cartilage cap at the end of the growth plate of long bones. Similar to structure are extraskeletal osteochondromas. However, unlike typical osteochondromas, extraskeletal osteochondromas are noncontinuous with bone. To our knowledge, all reported extraskeletal osteochondromas have been contained within fascial compartments. Here we present the case of a 5-year-old female who had a slow growing mass of the anterior distal right thigh. Imaging studies revealed an ossified mass extending from dermal layer of the subcutaneous tissue with no connection to the underlying deep fascia. An excisional biopsy was performed and proved to be a subdermal extraskeletal osteochondroma. PMID:28133559

  15. Schizandrol A: a lignan from Schisandra chinensis

    Directory of Open Access Journals (Sweden)

    Liang Zhao

    2008-08-01

    Full Text Available The title compound (systematic name: 1,2,3,10,11,12-hexamethoxy-6,7-dimethyl-5,6,7,8-tetrahydrodibenzo[a,c]cycloocten-6-ol, C24H32O7, has a dibenzocyclooctadiene skeleton. There are three molecules in the asymmetric unit, which are related by a pseudo-translation in the direction of the c axis. Nevertheless, the three molecules differ in the torsion angle of one of the methoxy groups. The dihedral angles between the two aromatic rings are 62.39 (10, 62.65 (10 and 61.84 (10° for the three molecules. The crystal packing is stabilized by a series of O—H...O and C—H...O hydrogen bonds, as well as C—H...π interactions.

  16. Life of a Tooth: A Visual Timeline

    Medline Plus

    Full Text Available ... Dentist Your Family's Oral Health About the AGD Dental care and oral health information you need from ... Child First See a Dentist? The History of Dental Advances Check Menstrual Calendar for Tooth Extraction Temporomandibular ...

  17. Triple A Syndrome: A Case Report

    Directory of Open Access Journals (Sweden)

    Murat Atmaca

    2014-09-01

    Full Text Available Triple A syndrome is a rarely seen autosomal recessive disease characterized by achalasia, adrenal failure and alacrima. The syndrome is frequently seen in childhood. The appearance of its components are usually ordered as alacrima, achalasia and adrenal failure. The majority of the patients diagnosed in the later stages predominantly present with neurological symptoms. In this study, a 21-year-old male who was referred to our clinic with clinical findings of chronic adrenal failure and was diagnosed WİTH triple A syndrome is presented. This patient had been operated three years ago due to achalasia. The diagnosis and treatment of adrenal failure in this syndrome is the most important determinant and indicator in the prognosis of the disease. Turk Jem 2014; 18: 97-99

  18. Harry Minti- a project for a book

    Science.gov (United States)

    Gaina, Alex

    2011-08-01

    A short biography and an account of scientific research of the Associated Professor of the Hebrew University in Jerusalem (Israel), Dr. Harry Minti (b. 1938, Bucharest) is given. His activity as translator was also mentioned.

  19. Linear immunoglobulin A dermatosis: A case report

    Directory of Open Access Journals (Sweden)

    Fernando Valenzuela Ahumada

    2017-06-01

    Full Text Available Resumen En este texto se presenta el caso de una paciente de sesenta y cinco años con sintomatología de dos meses de evolución consistente en prurito y lesiones hiperpigmentadas anulares en tronco, glúteos y extremidades superiores. En el área flexora de las muñecas presenta vesículas sobre base eritematosa y piel sana, sin evidencia de compromiso mucoso. Al estudio histológico se constata dermatitis vesicular subepidérmica con infiltrado inflamatorio de neutrófilos y eosinófilos. La inmunofluorescencia directa muestra depósito lineal y continuo de inmunoglobulina A en zona de membrana basal, compatible con dermatosis por inmunoglobulina A lineal.

  20. A thing finished is a thing dead

    DEFF Research Database (Denmark)

    Baumeister, Ruth

    2014-01-01

    The article gives a general overview of Asger Jorn´s position in architecture. Besides his theoretical stands, it exemplifies his position by showing the artist´s private house and garden in Albissola, Italy....

  1. Life of a Tooth: A Visual Timeline

    Medline Plus

    Full Text Available ... About | Contact InfoBites Quick Reference Learn more Children's Oral Health Men: Looking for a Better Job? Start by Visiting the Dentist Why is Oral Health Important for Men? Headaches and Jaw Pain? Check ...

  2. Ventana a la farmacología

    OpenAIRE

    Revista Facultad de, Medicina

    2012-01-01

    Aspirina para prevenir el ataque cardiaco o apoplético / Alteraciones fetales causados por los inhibidores de la enzima de conversión de la angiotensina (eca) / Efectos teratogénicos de los derivados de la vitamina a / Efectos teratogénicos de la warfarina / Algunos avances en farmacología en la última década / ¿Anticonceptivos que previenen el cáncer de seno?

  3. Malaria vaccine: A myth or a reality

    OpenAIRE

    Sarita Mohapatra

    2013-01-01

    Malaria is a common parasitic disease caused by Plasmodium spp. and transmitted by anopheles mosquito. Every year several million people are affected and killed due to this infection in the endemic regions of the world. Recently, drug resistance to the common antimalarial drugs has pressurized upon the development of an effective vaccine for the elimination of malaria along with other control measures. A number of vaccine trials are in the pipeline. Indeed, some were proven to have potential ...

  4. A Reminder and a Memorial [Book Review

    Directory of Open Access Journals (Sweden)

    Alfred White Franklin

    2009-09-01

    Full Text Available Originally published in the British Medical Journal on March 22, 1980, Volume 280, pages 851-855. The Quality of Life: the Peckham Approach to Human Ethology. Innes H Pearse. (Pp 194; £6 50. Scottish Academic Press.1979. The biologist studies man as a physical organism existing in a space-time world of measurable dimensions. This organism has the ability to adapt to changes in its environment; to the processes ofgrowth, development and aging; and to disease. The main objectives of medicine have been to help both adaptation and defence. Prevention through hygiene and immunisation, drugs, surgical removals, and replacements-all these make their contributions, which have increased in complexity and expense, disappointing Beveridge's hope in 1949 that a National Health Service plus rehabilitation (then a novelty would so improve health that the Service would wither away. To avoid and prevent ill health are worthy aims; to promote health is also worthy, but something different. It was to study healthy living that Dr Scott Williamson, Dr Innes Pearse, and their colleagues devised the Peckham experiment, of which this book is at once a reminder and a memorial. They wanted to study Homo sapiens in his natural habitat and they began their exploration as biologists. In an initial family club of 150 families they noted that disorders, however skilfully treated, recurred in the environment out of which the disorder had arisen. So, in 1935, they designed a laboratory in which human beings could be observed growing up and creating new families. The centre, purpose-built, combined maximum visibility throughout, flexibility, and free access to all members. By the outbreak of war 800-900 families had grown their own lively social life. Many of the original families rejoined when the centre reopened after the war. It finally closed in 1951. Meanwhile, the observers had invented a new role.

  5. Can a dike "feel" a free surface?

    Science.gov (United States)

    Pansino, S.; Taisne, B.

    2015-12-01

    This study uses analogue experiments to examine the various factors that could influence the dynamic or arrest of a dike prior to an eruption. Dike propagation has been well-studied from the perspective of analogue experiments and it has been shown how various competing forces interact (buoyancy, viscosity, elastic properties, fracture toughness,…). It has been observed that dikes experience acceleration as they approach a free surface, which theoretically is due to increasing stress intensity as distance to the free surface decreases. Other unrelated studies analysed the constant-volume propagation of low-surface-energy liquids (e.g. hydrophilic liquids) in a semi-infinite medium and found the propagation rate to decelerate, as liquid gradually transferred from the head region to the tail and buoyancy abated. In contrast, high-surface-energy fluids transfer negligible quantities of their volume into the tail region, essentially maintain their volume, and experience no such deceleration. This study focuses on the aforementioned factors influencing dike propagation, acceleration due to a free surface and deceleration due to head volume loss, to determine what their combined effect is on magma eruptability. As previous studies used hydrophobic liquids to investigate free-surface effects, and as magma is expected to have a low surface energy with the crust (they are both silicate), hydrophilic liquids (e.g. glucose syrup) are used in this study. Each experiment is arranged to have a free surface condition occupying half of the apparatus, and a no-slip condition occupying the other half, which allows for side-by-side comparison. The results are analysed to determine the minimum volume needed for a dike to erupt; failure to erupt implies that the dike would instead come to arrest in the crust.

  6. What makes a movement a gesture? ☆

    OpenAIRE

    Novack, Miriam A.; Wakefield, Elizabeth M.; Goldin-Meadow, Susan

    2015-01-01

    Theories of how adults interpret the actions of others have focused on the goals and intentions of actors engaged in object-directed actions. Recent research has challenged this assumption, and shown that movements are often interpreted as being for their own sake (Schachner & Carey, 2013). Here we postulate a third interpretation of movement—movement that represents action, but does not literally act on objects in the world. These movements are gestures. In this paper, we describe a framewor...

  7. A note on a walrus’ European odyssey

    Directory of Open Access Journals (Sweden)

    E W Born

    2014-02-01

    Full Text Available This study reports on the first successful identification of the site of origin of an extralimital walrus in Europe. On 24 February 2010 an adult male Atlantic walrus (Odobenus rosmarus rosmarus migrant was instrumented with a SPOT-5 satellite-linked transmitter (SLT while hauled out on a beach on the Faroe Islands at 62° 15' N/06° 32' W. This SLT transmitted until 5 March during which period the walrus made local movements, likely for feeding. Transmissions were not received during 6-25 March, however, visual observations during this time indicated that the walrus remained at the Faroe Islands. A second transmitter was deployed on the same animal on 25 March 2010 at another site on the islands (62° 16' N/07° 04' W. Activity data collected over 13 days indicated that the walrus hauled out in three different places in the Faroe Islands and used a total of 24% of its time resting on land.  On 29 March 2010 the walrus left the Faroe Islands and headed WNW towards NE Iceland. On 2 April it took a NNE course and swam towards Svalbard where the last location was received from a sea ice covered area on 25 April 2010 at 78° 27' N/09° 20' E (i.e. ca. 40 km west of the island of Prins Karls Forland in the western Svalbard archipelago. During 29 March-22 April the walrus swam a minimum distance of 2216 km between the last location at the Faroe Islands and the first location at Svalbard, with an average swimming speed of 4.5 km/h. A genetic analysis indicated that this walrus belonged to the Svalbard-Franz Josef Land subpopulation, thereby confirming that it returned to its site of origin.

  8. NASA and Superalloys: A Customer, a Participant, and a Referee

    Science.gov (United States)

    Nathal, Michael V.

    2008-01-01

    NASA has had a long history of research and development in the field of superalloys. These efforts have continued today, where the latest advancements in turbine disk and blade technologies are being developed Although NASA does support military flight systems, it s predominant role is in supporting civilian air transportation systems, and thus has goals for improving fuel efficiency, emissions, noise, and safety of today s aircraft. NASA has traditionally served several distinct but complimentary roles as participants in multi-disciplinary research teams, as customers who fund research and development efforts at industry and universities, and as referees who can address broad issues that affect the entire aeronautics community. Because of our longer range viewpoint, we can take on higher risk, higher reward research topics. NASA can also serve as an intermediary between the basic research performed primarily at universities and the development efforts emphasized by industry. By interacting with individual companies, NASA can identify areas of general interest and problems common to a large portion of the aeronautics community, and devise programs aimed at solving these problems. In space missions, NASA is a direct customer responsible for developing vehicles. In the case of the Space Shuttle, NASA has worked with various contractors to design and build numerous components out of superalloys. Another fascinating area for the use of superalloys is in power systems for long life applications in space. Potential missions include providing electric power for deep space missions, surface rovers, including lunar and Mars, and stationary power generators on the lunar surface.

  9. Worldviews: A blessing or a curse?

    Directory of Open Access Journals (Sweden)

    Bert Olivier

    2012-10-01

    Full Text Available The concept of a worldview resonates with other concepts, such as those of ‘culture’, ‘civilisation’, and ‘way of life’. Arguably, it is a modern phenomenon, the possibility of which was actualised at the dawn of the modern epoch. Nevertheless, in principle, its ‘possibility’ goes back as far as Plato’s Republic. It is Heidegger, however, who is most informative for understanding what a worldview is, as well as why the modern epoch is its time of provenance. Consequently, an analysis of Heidegger’s essay, ‘The time of the world picture’ (or worldview provided the framework within which it was argued that worldviews are both blessings and curses in the current era: blessings, because, as Harries has argued, we have been disabused of the modern idea of one encompassing worldview or ideology, so that one can no longer believe in only a single ’correct’ view of the world; curses, because they bedevil any wellintended attempts at communicating with understanding on issues of common concern. It was the burden of this article to provide a way of addressing this state of affairs with some hope of transcending the causes of alienation and it is again Heidegger who is the source of such a way, through his notion of the ‘fourfold’.

  10. A proposal of a local modified QCD

    CERN Document Server

    de Oca, Alejandro Cabo Montes

    2012-01-01

    A local and renormalizable version of a modified PQCD introduced in previous works is presented. The construction indicates that it could be equivalent to massless QCD. The case in which only quark condensate effects are retained is discussed in more detail. Then, the appearing auxiliary fermion fields can be integrated leading to a theory with the action of massless QCD, to which one local and gauge invariant Lagrangian term for each quark flavour is added. These terms are defined by two gluon and two quark fields, in a form curiously not harming power counting renormalizability. The gluon self-energy is evaluated in second order in the gauge coupling and all orders in the new quark couplings, and the result became transversal as required by the gauge invariance. The vacuum energy was calculated in the two loop approximation and also became gauge parameter independent. The possibilities that higher loop contributions to the vacuum energy allow the generation of a quark mass hierarchy as a flavour symmetry br...

  11. A Design for a Quantum Time Machine

    CERN Document Server

    Gray, A

    1998-01-01

    In the new ``History Selection'' formulation of Quantum Mechanics an entire cosmic history is selected over all space and time, with a probability for selection assigned to each possible history. As this probability depends on the whole history, and is not merely composed of the product of probabilities for each step in the history, the theory is not a causal theory. It shall be shown that this violation of causality is usually completely unobservable and confined to the microscopic world, occurring inbetween ``observations''. However it shall also be shown that in certain special circumstances it is possible to exploit the intrinsic non-causal nature of the theory to violate causality at the macroscopic level. A practical design for a device which can exploit this effect is shown. Such a device would effectively enable one to see into the future, and is thus a kind of time machine. Finally it shall be shown that, according to this new formulation of Quantum Mechanics, this does not give rise to any unpleasan...

  12. A Cooperation Model Applied in a Kindergarten

    Directory of Open Access Journals (Sweden)

    Jose I. Rodriguez

    2011-10-01

    Full Text Available The need for collaboration in a global world has become a key factor for success for many organizations and individuals. However in several regions and organizations in the world, it has not happened yet. One of the settings where major obstacles occur for collaboration is in the business arena, mainly because of competitive beliefs that cooperation could hurt profitability. We have found such behavior in a wide variety of countries, in advanced and developing economies. Such cultural behaviors or traits characterized entrepreneurs by working in isolation, avoiding the possibilities of building clusters to promote regional development. The needs to improve the essential abilities that conforms cooperation are evident. It is also very difficult to change such conduct with adults. So we decided to work with children to prepare future generations to live in a cooperative world, so badly hit by greed and individualism nowadays. We have validated that working with children at an early age improves such behavior. This paper develops a model to enhance the essential abilities in order to improve cooperation. The model has been validated by applying it at a kindergarten school.

  13. A Deep Chandra Observation of A2052

    Science.gov (United States)

    Blanton, E. L.; Douglass, E. M.; Sarazin, C. L.; Clarke, T. E.; McNamara, B. R.

    We present initial results from a long (125 ksec) Chandra observation of Abell 2052. A2052 is a bright, nearby, cooling core cluster at a redshift of z=0.0348. It was previously observed for 36 ksec with Chandra [3,4]. The longer observation reveals ripples in the surface brightness, similar to what has been seen in e.g., the Perseus cluster [5] and M87/Virgo [6]. The southern cavity now appears to be split into two cavities with the southernmost cavity likely representing a ghost bubble from earlier radio activity. There also appears to be a ghost bubble present to the NW of the cluster center. Bright emission in the X-ray corresponds very well with optical line emission, and the correlated X-ray emission is seen to continue from the N bubble edge closer to the AGN in this longer exposure, tracking the H-α emission. The energy deposited by the radio source, as determined by measuring the pressure in the bright, X-ray shells, averaged over the repetition rate of the radio source (determined from either the ripple separation or the ghost cavity distances) can easily offset the cooling in the core of the cluster.

  14. A leitura: um passaporte para a vida

    Directory of Open Access Journals (Sweden)

    Armindo Teixeira Mesquita

    2011-06-01

    Full Text Available Nas sociedades actuais, a capacidade para usar material escrito é indispensável ao acesso a todo tipo de informação, tornando o uso da leitura cada vez mais necessário à participação real do cidadão em actividades produtivas e colectivas, porque ajuda a formar seres pensantes. O contacto com os livros deve ser iniciado o mais cedo possível, não só pelo manuseio, como também pela história contada ou pelos jogos rítmicos. Com efeito, na idade da infância, toda a energia do indivíduo é dirigida para a construção da sua identidade. Logo, as primeiras leituras entram no período da formação e da fundação, isto é, consignamos à leitura uma grande força de desenvolvimento pessoal. Os livros, para além de auxiliares na aprendizagem do mundo, formam o leitor no gosto. Formar o gosto e possibilitar escolhas são realidades fundamentais na vida adulta.

  15. De Analogía a Digitalia

    Directory of Open Access Journals (Sweden)

    Dr. Xaime Fandiño Alonso

    2001-01-01

    Full Text Available La transformación hacia la tecnología numérica ha provocado en el último decenio cambios importantes en los entornos de creación, operación, transformación y distribución de productos audiovisuales.Los restos de la era analógica están dando sus últimos estertores de la mano de unos entornos digitales, desarrollados velozmente.Estos nuevos equipos son en la mayoría de los casos prototipos. La velocidad del mercado, la competencia, las joint-ventures..., no permiten ningún tipo de relajo a las empresas tecnológicas que participan en esta carrera desenfrenada de competitividad.Las maquinarias dedicadas a procesos puntuales, cada vez más, son historias para el recuerdo. Hoy todo es efímero y la tecnología de antaño basada en equipos mecánicos (magnetoscopios..., plataformas y soportes lineales (cintas... están abocados a la desaparición.Conceptos de solvencia empresarial tales como "los grandes y los pequeños", utilizados en otros ámbitos de la industria, son en el sector audiovisual cada vez más delicados. En los diarios económicos podemos leer cómo, con cierta asiduidad, empresas muy posicionadas en el sector se ven abocadas a establecer fusiones, compras y participaciones, con pequeñas células de creación y desarrollo que surgen de la creatividad de jóvenes emprendedores, hasta ayer desconocidos.La era digital está corriendo un enorme telón y deja atrás, por suerte, una etapa analógica en la que la posesión de los medios de producción, debido a sus costes, era motivo suficiente para negar la participación y el acceso, a equipos tecnológicos audiovisuales de carácter profesional, a los creadores.Hoy, lo digital proporciona nuevos sistemas con entornos productivos más amables a la vez que reduce considerablemente coste de los equipamientos. En este momento, despojados ya de los inconvenientes analógicos, el talento es el verdadero motor de la industria audiovisual, en un sector que aglutina tecnología

  16. A Fat strange Repeller

    Institute of Scientific and Technical Information of China (English)

    申影; 何阅; 姜玉梅; 何大韧

    2004-01-01

    This article reports an observation on a fat strange repeller, which appears after a characteristic crisis observed in a kicked rotor subjected to a piecewise continuous force field. The discontinuity border in the definition range of the two-dimensional mapping, which describes the system, oscillates as the discrete time develops. At a threshold of a control parameter a fat chaotic attractor suddenly transfers to a fat transient set. The strange repeller, which appears after the crisis, is also a fat fractal. This is the reason why super-transience happens

  17. Dial-a-Ride

    OpenAIRE

    2003-01-01

    The Dial-a-Ride problem is a Vehicle Routing problem in its most general form. The problem was formulated in the beginning of the 1970's and since then a large number of researchers have worked on developing efficient algorithms for use in automated planning of Dial-a-Ride transportation systems. In a Dial-a-Ride transportation system, passengers request a trip between two stops with either a desired time of departure from the pickup stop or a desired time of arrival at the destination. The t...

  18. A sabedoria da democracia

    Directory of Open Access Journals (Sweden)

    Gilson Matilde Diana

    2010-01-01

    Full Text Available http://dx.doi.org/10.5007/1677-2954.2010v9n1p131Durante a maior parte da história, a democracia foi desprezada como uma forma política inferior – a regra do povo, ou “dos muitos”, era logo identificada como a regra da ralé, da escória. Herdando do povo a volubilidade e a instabilidade, a democracia estava sempre perigosamente próxima do arbítrio e da anarquia, com toda a violência que se costuma associar a isso.

  19. Creating a Marketing Plan.

    Science.gov (United States)

    Sevier, Robert A.

    1989-01-01

    A guide to developing a college marketing plan defines key marketing terms, outlines the development of a plan (including institutional analysis, market research, strategy formation and execution, and program evaluation), and provides a list of important principles with which to operate a program. (MSE)

  20. Lipoprotein(a) metabolism

    Science.gov (United States)

    Lipoprotein(a) [Lp(a)] is an atherogenic lipoprotein. The metabolism of this lipoprotein is still not well understood. It has long been known that the plasma concentration of Lp(a) is highly heritable, with its genetic determinants located in the apo(a) locus and regulating the rate of hepatic apo(a...

  1. Creating a Marketing Plan.

    Science.gov (United States)

    Sevier, Robert A.

    1989-01-01

    A guide to developing a college marketing plan defines key marketing terms, outlines the development of a plan (including institutional analysis, market research, strategy formation and execution, and program evaluation), and provides a list of important principles with which to operate a program. (MSE)

  2. A Hydrostatic Paradox Revisited

    Science.gov (United States)

    Ganci, Salvatore

    2012-01-01

    This paper revisits a well-known hydrostatic paradox, observed when turning upside down a glass partially filled with water and covered with a sheet of light material. The phenomenon is studied in its most general form by including the mass of the cover. A historical survey of this experiment shows that a common misunderstanding of the phenomenon…

  3. 40 CFR Appendix A to Subpart A of... - Appendix A to Subpart A of Part 750

    Science.gov (United States)

    2010-07-01

    ... 40 Protection of Environment 30 2010-07-01 2010-07-01 false Appendix A to Subpart A of Part 750 A Appendix A to Subpart A of Part 750 Protection of Environment ENVIRONMENTAL PROTECTION AGENCY (CONTINUED... ACT Procedures for Rulemaking Under Section 6 of the Toxic Substances Control Act Pt. 750, Subpt....

  4. Writing a Movie.

    Science.gov (United States)

    Hoffner, Helen

    2003-01-01

    Explains a reading and writing assignment called "Writing a Movie" in which students view a short film segment and write a script in which they describe the scene. Notes that this assignment uses films to develop fluency and helps students understand the reading and writing connections. Concludes that students learn to summarize a scene from film,…

  5. A Montessori Odyssey

    Science.gov (United States)

    Hanson, Peter

    2013-01-01

    Forty years ago, Peter Hanson decided to attend the 38th Indian Montessori Training Course. In this article he describes himself as a college-educated generalist who liked kids but was working for little more than minimum wage as a delivery boy. Becoming a teacher in an alternative school seemed like a good move, and a step up without…

  6. Designing a Weather Station

    Science.gov (United States)

    Roman, Harry T.

    2012-01-01

    The collection and analysis of weather data is crucial to the location of alternate energy systems like solar and wind. This article presents a design challenge that gives students a chance to design a weather station to collect data in advance of a large wind turbine installation. Data analysis is a crucial part of any science or engineering…

  7. A Night's Sleep, Ultracheap

    Institute of Scientific and Technical Information of China (English)

    2006-01-01

    @@ You tote your own luggage, the bed's a bit stiff, and the decor in the spartan rooms and lobby is reminiscent of a college dorm. Oh-and you can't buy a beer. But for $22 a night,the indi One Hotel is one heck of a bargain.

  8. What's a Fart?

    Science.gov (United States)

    ... dientes Video: Getting an X-ray What's a Fart? KidsHealth > For Kids > What's a Fart? Print A A A en español ¿Qué es ... How can your body make something so stinky? Farts — also called flatus (say: FLAY-tuss) or intestinal ( ...

  9. Epilepsy is a disease!

    Directory of Open Access Journals (Sweden)

    Walter Oleschko Arruda

    1994-12-01

    Full Text Available According to the definition of disease, epilepsy shall not be considered neither a symptom nor a syndrome. Epilepsy is a generic term for a group of diseases characterized by seizures. It implies a state quite distinct from health. Therefore it seems worthy to keep epilepsy as such in the International Classification of Diseases (ICD.

  10. [A peripheral osteoma].

    NARCIS (Netherlands)

    Mizbah, K.; Soehardi, A.; Maal, T.J.J.; Weijs, W.L.J.; Merkx, M.A.W.; Barkhuysen, R.

    2012-01-01

    A 43-year-old man appeared with a painless, asymptomatic swelling on the left side of his neck, which had existed for years and had slowly been progressing. After surgical removal, it became clear that it had to do with a peripheral osteoma. This is a benign lesion with a low incidence. Generally, c

  11. A Hydrostatic Paradox Revisited

    Science.gov (United States)

    Ganci, Salvatore

    2012-01-01

    This paper revisits a well-known hydrostatic paradox, observed when turning upside down a glass partially filled with water and covered with a sheet of light material. The phenomenon is studied in its most general form by including the mass of the cover. A historical survey of this experiment shows that a common misunderstanding of the phenomenon…

  12. Smile: A review.

    Science.gov (United States)

    Manjula, W S; Sukumar, M R; Kishorekumar, S; Gnanashanmugam, K; Mahalakshmi, K

    2015-04-01

    "Beauty is in the mind of the beholder, each mind perceives a different beauty" famously said by writer Margeret Wolfe Hungerford. A beautiful smile is a gateway to the world. The aim of this article was to identify the criteria for designing the perfect smile. It was determined, smile design is a multifactorial process and various steps are involved in designing a radiant smile.

  13. A Causal Rhythm Grouping

    DEFF Research Database (Denmark)

    Jensen, Karl Kristoffer

    2005-01-01

    This paper presents a method to identify segment boundaries in music. The method is based on a multi-step model; first a features is measured from the audio, then a measure of rhythm is calculated from the feature, the diagonal of a self-similarity matrix is calculated, and finally the segment bo...

  14. Traveling Along a Zipline

    Science.gov (United States)

    2011-03-01

    and providing a one- dimensional (1D) analogy [5] to the 2D illustration of a heavy marble rolling around on a stretched rubber sheet [6]. A 1D...117–122 (1997). [3] Gruber, R.P., Gruber, A.D., Hamilton, R. and Matthews, S.M., Space curvature and the “heavy banana paradox”, Phys. Teach. 29

  15. A tribute to Peter A. Rona: A Russian Perspective

    Science.gov (United States)

    Sagalevich, Anatoly; Lutz, Richard A.

    2015-11-01

    In July 1985 Peter Rona led a cruise of the National Oceanic and Atmospheric Administration (NOAA) ship Researcher as part of the NOAA Vents Program and discovered, for the first time, black smokers, massive sulfide deposits and vent biota in the Atlantic Ocean. The site of the venting phenomena was the Trans-Atlantic Geotraverse (TAG) Hydrothermal Field on the east wall of the rift valley of the Mid-Atlantic Ridge at 26°08‧N; 44°50‧W (Rona, 1985; Rona et al., 1986). In 1986, Peter and an international research team carried out multidisciplnary investigations of both active and inactive hydrothermal zones of the TAG field using the R/V Atlantis and DSV Alvin, discovering two new species of shrimp (Rimicaris exoculata and Chorocaris chacei) (Williams and Rona, 1986) and a hexagonal-shaped form (Paleodictyon nodosum) thought to be extinct (Rona et al., 2009). In 1991 a Russian crew aboard the R/V Akademik Mstislav Keldysh, with two deep-diving, human-occupied submersibles (Mir-1 and Mir-2) (Fig. 1), had the honor of having Peter Rona and a Canadian IMAX film crew from the Stephen Low Company on board to visit the TAG hydrothermal vent field. This was the first of many deep-sea interactions between Russian deep-sea scientists and their colleagues from both the U.S. and Canada. This expedition to the TAG site was part of a major Russian undersea program aimed at exploring extreme deep-sea environments; between 1988 and 2005, the Mir submersibles visited hydrothermal vents and cold seep areas in 20 deep-sea regions throughout the world's oceans (Sagalevich, 2002). Images of several of these areas (the TAG, Snake Pit, Lost City and 9°50‧N vent fields) were obtained using an IMAX camera system emplaced for the first time within the spheres of the Mir submersibles and DSV Alvin in conjunction with the filming of science documentaries (e.g., "Volcanoes of the Deep Sea") produced by the Stephen Low Company in conjunction with Emory Kristof of National Geographic and

  16. Defining a monophyletic Cardinalini: a molecular perspective.

    Science.gov (United States)

    Klicka, John; Burns, Kevin; Spellman, Garth M

    2007-12-01

    Within the New World nine-primaried oscine assemblage, feeding morphology and behavior have long been used as a guideline for assigning membership to subgroups. For example, birds with stout, conical bills capable of crushing heavy seeds have generally been placed within the tribe Cardinalini (cardinal-grosbeaks). Many workers have tried to characterize this group more definitively, using a variety of morphological characters; however, the characters used often conflicted with one another. Previous molecular studies addressing the monophyly of Cardinalini have had only limited sampling within the group. In this study, we analyze mtDNA sequence data from all genera and 34 of the 42 Cardinalini species (sensu [Sibley, C.G., Monroe, B.L., 1990. Distribution and Taxonomy of the Birds of the World, Yale University Press, New Haven, CT]) to address the monophyly of the group and to reconstruct the most complete phylogeny of this tribe published to date. We found strong support for a redefined Cardinalini that now includes some members previously placed within Thraupini (tanagers; the genera Piranga, Habia, Chlorothraupis, and Amaurospiza) and some members previously placed within the Parulini (wood-warblers; the genus Granatellus). In addition, some genera traditionally considered members of the Cardinalini are shown to have affinities with other groups (the genera Porphyrospiza, Parkerthraustes, and Saltator). Our redefined Cardinalini contains 48 species, six more than are listed in Sibley and Monroe's (1990) taxonomy of the group. Within the nine-primaried oscine assemblage, the Cardinalini are more closely related to the Thraupini (tanagers) than they are to the Emberizini (sparrows), Parulini (wood-warblers), or Icterini (blackbirds), consistently forming a monophyletic group with Thraupini across all analyses. The reconfigured Cardinalini is comprised of five well-supported, major clades: (1) a "masked" clade (Piranga, Cardinalis, Caryothraustes, Periporphyrus, and

  17. PREFACE: A Stellar Journey A Stellar Journey

    Science.gov (United States)

    Asplund, M.

    2008-10-01

    The conference A Stellar Journey was held in Uppsala, Sweden, 23 27June 2008, in honour of Professor Bengt Gustafsson's 65th birthday. The choice of Uppsala as the location for this event was obvious given Bengt's long-standing association with the city stemming back to his school days. With the exception of a two-year postdoc stint in Copenhagen, five years as professor at Stockholm University and two years as director of the Sigtuna foundation, Bengt has forged his illustrious professional career at Uppsala University. The symposium venue was Museum Gustavianum, once the main building of the oldest university in Scandinavia. The title of the symposium is a paraphrasing of Bengt's popular astronomy book Kosmisk Resa (in English: Cosmic Journey) written in the early eighties. I think this aptly symbolizes his career that has been an astronomical voyage from near to far, from the distant past to the present. The original book title was modified slightly to reflect that most of his work to date has dealt with stars in one way or another. In addition it also gives credit to Bengt's important role as a guiding light for a very large number of students, colleagues and collaborators, indeed for several generations of astronomers. For me personally, the book Kosmisk Resa bears particular significance as it has shaped my life rather profoundly. Although I had already decided to become an astronomer, when I first read the book as a 14-year-old I made up my mind then and there that I would study under Bengt Gustafsson and work on stars. Indeed I have remained true to this somewhat audacious resolution. I suspect that a great number of us have similar stories how Bengt has had a major influence on our lives, whether on the professional or personal level. Perhaps Bengt's most outstanding characteristic is his enthralling enthusiasm. This is equally true whether he is pondering some scientific conundrum, supervising students or performing in front of an audience, be it an

  18. A major safety overhaul

    CERN Multimedia

    2003-01-01

    A redefined policy, a revamped safety course, an environmental project... the TIS (Technical Inspection and Safety) Division has begun a major safety overhaul. Its new head, Wolfgang Weingarten, explains to the Bulletin why and how this is happening.

  19. Orkney Futures: a Handbook

    DEFF Research Database (Denmark)

    2009-01-01

    Published with the assistance of a grant from HI~Arts, Inverness, and a grant from the Scottish Arts Council, Edinburgh. A selected group of 49 responses to the invitation to imagine Orkney’s future....

  20. What's a Vegetarian?

    Science.gov (United States)

    ... or Too Short All About Puberty What's a Vegetarian? KidsHealth > For Kids > What's a Vegetarian? Print A ... cows) and eggs (from chickens). Many Types of Vegetarians There are many kinds of vegetarians. Here are ...

  1. Becoming a Vegetarian

    Science.gov (United States)

    ... Help Someone Who's Being Bullied? Volunteering Becoming a Vegetarian KidsHealth > For Teens > Becoming a Vegetarian Print A ... en español Hacerse vegetariano Why Do People Become Vegetarians? For much of the world, vegetarianism is largely ...

  2. IgA Nephropathy

    Science.gov (United States)

    ... Health Information Kidney Disease IgA Nephropathy Related Topics Section Navigation Kidney Disease Acquired Cystic Kidney Disease Amyloidosis & ... for a Child with Kidney Disease Ectopic Kidney Medullary Sponge Kidney Kidney Dysplasia Kidney Failure Choosing a ...

  3. Vitamin A blood test

    Science.gov (United States)

    ... this page: //medlineplus.gov/ency/article/003570.htm Vitamin A blood test To use the sharing features on this page, please enable JavaScript. The vitamin A test measures the level of vitamin A ...

  4. A smattering of antimatter.

    CERN Multimedia

    Yam, P

    1996-01-01

    Physicists at CERN have succeeded in developing antihydrogen by directing a beam of antiprotons through a jet of xenon atoms. The antihydrogen results from the interaction of one antiproton with a xenon atom. However, it lasts for only 40 seconds.

  5. Dyslexia: A Survivor's Story.

    Science.gov (United States)

    Rogers, Trumbull

    1991-01-01

    A successful adult with dyslexia recounts his experiences as a child including poor school reports, emotional problems, clumsiness, as well as the help provided by a special school for boys with dyslexia. (DB)

  6. Derivations in a tetrahedron

    Science.gov (United States)

    Vladeva, Dimitrinka I.; Trendafilov, Ivan D.

    2015-11-01

    One of the natural questions which often appeared in algebra and analysis whether a map can be defined by its "local" properties. In this paper we consider maps which acts like a derivation on semirings of a special type.

  7. A Nonideal Flow Experiment.

    Science.gov (United States)

    Gonzalez-Velasco, Juan Ramon; Elorriaga, Javier Bilbao

    1984-01-01

    Considers the deviation from the ideal flows of both a backmix tank and a backmix tank followed by a flow vessel. Background information, apparatus used, and experimental procedures are provided. Typical results are also provided and discussed. (JN)

  8. Having a Healthy Pregnancy

    Science.gov (United States)

    ... Week of Healthy Breakfasts Shyness Having a Healthy Pregnancy KidsHealth > For Teens > Having a Healthy Pregnancy A ... or she can help you to get treatment. Pregnancy Discomforts Pregnancy can cause some uncomfortable side effects. ...

  9. A Misleading Trismus

    Directory of Open Access Journals (Sweden)

    A. Galzerano

    2011-01-01

    Full Text Available We report the case of a 73-year-old women admitted to ICU with a diagnosis of tetanum supported by a mild trismus and treated with potentially unsafe drugs until the correct diagnosis was made.

  10. Who Needs a Pacemaker?

    Science.gov (United States)

    ... of portable EKGs are Holter and event monitors . Holter and Event Monitors A Holter monitor records the heart's electrical activity for a ... EKG. An event monitor is similar to a Holter monitor. You wear an event monitor while doing ...

  11. Preventing hepatitis A

    Science.gov (United States)

    Hepatitis A is inflammation (irritation and swelling) of the liver caused by the hepatitis A virus. You can take several steps to ... reduce your risk of spreading or catching the hepatitis A virus: Always wash your hands thoroughly after ...

  12. Checking a printed board

    CERN Multimedia

    1977-01-01

    An 'Interactive Printed Circuit Board Design System' has been developed by a company in a Member-State. Printed circuits are now produced at the SB's surface treatment workshop using a digitized photo-plotter.

  13. TOXICODERMIA ASOCIADA A BENDAMUSTINA

    Directory of Open Access Journals (Sweden)

    Valdivia I

    2014-05-01

    Full Text Available Bendamustine is a cytotoxic drug used in the treatment of Chronic Lymphocytic Leukemia can cause various adverse skin reactions. We report the case of a woman who received Bendamustine and developed a skin rash

  14. A Psychobiographical Case Study

    African Journals Online (AJOL)

    2017) and is experiencing an upswing internationally, such that it is .... era and creating the possibility of a new one. Termed .... An additional strategy entailed the construction of a ...... This transition serves as a bridge from early to middle.

  15. Hepatitis A FAQs

    Science.gov (United States)

    ... Policy and Programs Resource Center Viral Hepatitis Hepatitis A Questions and Answers for the Public Recommend on ... Hepatitis C. What is the difference between Hepatitis A, Hepatitis B, and Hepatitis C? Hepatitis A , Hepatitis ...

  16. Building a Better Planet

    Institute of Scientific and Technical Information of China (English)

    2007-01-01

    Transitioning into a broader role as senior civil servant of the United Nations after 37 years as a Chinese diplomat,UN Under Secretary General Sha Zukang certainly has had a tough task to quickly understand UN culture

  17. A semiconductor laser

    Energy Technology Data Exchange (ETDEWEB)

    Naoko, O.; Masaru, K.

    1984-04-20

    A semiconductor laser with enhanced characteristics is patented in which bleaching coatings are generated on the outcoupling mirrors by sputtering alternating coating layers made from A1203 and A10, with high and low indices of refraction.

  18. A mechanised microirrigation system.

    Science.gov (United States)

    Gould, J S; Henson, P G; Gould, S H

    1979-10-01

    A mechanised microirrigation system for microvascular surgery, which is operated by a foot pedal, utilises a large sterile reservoir, and allows control of flow rate and volume, has been designed for use in the laboratory and operating room.

  19. A Colorful Equatorial Wonderland

    Institute of Scientific and Technical Information of China (English)

    2007-01-01

    @@ Papua New Guinea (PNG) is one of the least visited countries in the world... a last frontier for international travelers. PNG is a colorful equatorial wonderland as well as a living example of human's culture 1000 years ago.

  20. A cidadania, o universalismo e a diferença

    Directory of Open Access Journals (Sweden)

    Paulo Manuel Costa

    2015-01-01

    Full Text Available The contemporary debate on citizenship has been dominated by three theoretical currents: liberalism, communitarianism and republicanism. It reveals different ways of conceptualising citizenship and thus a diversity of proposals for the design and organization of political institutions. In this article we intend to grasp how these theories deal with the specific issue of difference and cultural diversity. The systematization of the debate was made with reference to four thematic axes: first, the relationship to be established between the public sphere and the private sphere; as a function of this joint, which identity prevails in the political community; thirdly, what is the role assigned to political participation; and, finally, the reflexes that citizenship may have on social cohesion of the political community. The existence of a core of common values and principles is essential to the stability and cohesion of the community, but it must be able to incorporate the difference in order to develop an identity that can be shared by various cultural and ethnic groups and thus prevent exclusion, marginalization and oppression. The best way to ensure quantitative and qualitative expansion of citizenship seems to be one that promotes the participation and involvement of individuals and groups in the process of (redefinition of common values and principles that ensure life together. This process also seems to involve moving away from rigid and dogmatic readings of the liberal principles and the refusal of non-liberal claims and principles, particularly those that question the freedom of individuals against the political power and social groups.

  1. Making a Difference: a Global Geoscience Initiative

    Science.gov (United States)

    Nickless, E.

    2013-05-01

    Since 2009, an informal group, comprising four former board members of the International Year of Planet Earth, has been promoting the concept of a so-called Global Geoscientific Initiative. The GGI should: i.Be inclusive, involve a geoscience community, which is broad both in terms of discipline and nationality, and involve the social sciences; ii.Have a clear socio-economic context and global societal relevance; iii.Focus on a globally significant science theme and preferably involve global processes; iv.Attract the support of geoscientific communities, funding agencies, governments and other institutions in many countries, under the umbrella of UNESCO, ICSU and its geoscientific unions. A series of five town hall meetings have been held at which usually three invited, well-respected figures from the geoscientific community gave presentations. Those presentations were followed by discussion about the importance or otherwise of particular areas of science, and the need to engage better with legislators, policy makers, the media and the lay public. No one challenged the desirability of a large-scale programme that would attract researchers from many geoscientific disciplines and potentially involve the geo-unions. The discussions can be summarised under three broad themes: i.Mineral and hydrocarbon resources and their waste products; ii.Living with natural hazards; iii.Strategic Earth science in Africa through the Africa Alive corridors. During the course of development of the GGI, ICSU has issued a number of papers, most recently a strategic plan, covering the period 2012-2017, working parties have been undertaking foresight analysis and there have also been discussions concerning regional environmental change: human action and adaptation with the question "what does it take to meet the Belmont challenge?". The Belmont Forum brings together a number of funding agencies and could provide the resource to enable some initiative to go forward. More recently a programme

  2. Decavanadate: a journey in a search of a role.

    Science.gov (United States)

    Aureliano, Manuel

    2009-11-14

    Currently, efforts have been directed towards using decavanadate as a tool for the understanding of several biochemical processes such as muscle contraction, calcium homeostasis, in vivo changes of oxidative stress markers, mitochondrial oxygen consumption, mitochondrial membrane depolarization, actin polymerization and glucose uptake, among others. In addition, studies have been conducted in order to make vanadium available and safe for clinical use, for instance with decavanadate compounds that present interesting pharmacological properties, eventually useful for the treatment of diabetes. Here, recent contributions of decavanadate to the effects of vanadium in biological systems, not only in vitro, but also in vivo, are analysed.

  3. You are not a gadget a manifesto

    CERN Document Server

    Lanier, Jaron

    2011-01-01

    A programmer, musician, and father of virtual reality technology, Jaron Lanier was a pioneer in digital media, and among the first to predict the revolutionary changes it would bring to our commerce and culture. Now, with the Web influencing virtually every aspect of our lives, he offers this provocative critique of how digital design is shaping society, for better and for worse. Informed by Lanier’s experience and expertise as a computer scientist, You Are Not a Gadget discusses the technical and cultural problems that have unwittingly risen from programming choices—such as the nature of user identity—that were “locked-in” at the birth of digital media and considers what a future based on current design philosophies will bring. With the proliferation of social networks, cloud-based data storage systems, and Web 2.0 designs that elevate the “wisdom” of mobs and computer algorithms over the intelligence and wisdom of individuals, his message has never been more urgent.

  4. A Review on Noma: A Recent Update.

    Science.gov (United States)

    Ashok, Nipun; Tarakji, Bassel; Darwish, Shourouk; Rodrigues, Jean C; Altamimi, Mohammad A

    2015-07-30

    Noma is a gangrenous infection primarily affecting under developed countries. The aim of this paper was to review all recent articles on noma from January 2003 to August 2014 and briefly update the latest information related to the topic. A literature search was done on PUBMED using the keywords "noma/cancrum oris". Noma is commonly seen in malnourished children. There has been an increased incidence of noma in HIV patients. Apart from these, noma has also been reported in association with cyclic neutropenia, herpetic stomatitis, leukemia, Down's syndrome and Burkett's disease. Treatment of acute noma includes transfusion of blood and intravenous fluids, administration of antibiotics, putting the patient on a high protein diet and debridement of necrotic areas. Surgical phase is usually initiated 6 to 18 months after a period of quiescence. Although, the mortality rate associated with noma has reduced significantly with the advent of modern generation antibiotics, the functional, cosmetic and psychological challenges associated with the destruction of soft or hard tissues still remains a huge challenge. Adequate steps must be implemented by the government or medical professionals to prevent the disease and provide an early intervention.

  5. Use a defibrillator, save a life

    CERN Multimedia

    Joannah Caborn Wengler

    2012-01-01

    With the work for Long Shutdown 1 looming on the horizon, the CERN Fire Brigade is anticipating a heavy workload: more people working at CERN means more call-outs. So the more trained first-aiders around to help out before the paramedics arrive, the better. Would you know what to do in a medical emergency?   It could happen at any time: two colleagues are having a coffee at work, when one suddenly clutches his or her chest and falls to the floor unconscious. What would you do? Run to find a first-aider? Call the ambulance and wait, finishing your coffee? Neither response is entirely correct. On Monday 11 June in Building 40 the CMS safety group, in collaboration with the Fire Brigade and the Medical Service, demonstrated the recommended, potentially life-saving response to cardiac arrest (see the video), including the correct use of a defibrillator, ten of which were recently installed in key CERN locations (the Bulletin reported).     “In countries where...

  6. Pop in a Popper

    Science.gov (United States)

    Reading Teacher, 2011

    2011-01-01

    This article describes Pop in a Popper, an effective lesson for teaching students how to choose and use words to give their writing fluency and flair. Pop in a Popper introduces the appositive: a group of words inserted after a noun to modify that noun. In simplest terms, writers pop this group of words into a sentence to tell more about a noun.…

  7. Bibliografía

    Directory of Open Access Journals (Sweden)

    Rosa María Montero Tejada

    1992-01-01

    Full Text Available RESEÑA 1 de : Viña Liste, José María. Cronología de la Literatura Española, vol. Edad Media. Madrid : Ed. Cátedra, 1991. RESEÑA 2 de : VV.AA. Bandos y querellas dinásticas en España al final de la Edad Media. París : Cuadernos de la Biblioteca Española, 1991.

  8. A Workshop that Works

    CERN Document Server

    Yunes, Nicolas

    2014-01-01

    The main goal of a scientific workshop is to bring together experts in a specific field or related fields to collaborate, to discuss, and to creatively make progress in a particular area. The organizational aspects of such a meeting play a critical role in achieving these goals. We here present suggestions from scientists to scientists that hopefully help in organizing a successful scientific workshop that maximizes collaboration and creativity.

  9. 'A Place to Sit'

    DEFF Research Database (Denmark)

    Hvejsel, Marie Frier; Klok, Julie Skovgaard; Bøhnke, Mia Marker

    Published in 2014 on the occasion of the third 'A Place to Sit' exhibition as a reflection upon three years of teaching tectonic method in architecture using the furniture scale as a learning basis.......Published in 2014 on the occasion of the third 'A Place to Sit' exhibition as a reflection upon three years of teaching tectonic method in architecture using the furniture scale as a learning basis....

  10. Pop in a Popper

    Science.gov (United States)

    Reading Teacher, 2011

    2011-01-01

    This article describes Pop in a Popper, an effective lesson for teaching students how to choose and use words to give their writing fluency and flair. Pop in a Popper introduces the appositive: a group of words inserted after a noun to modify that noun. In simplest terms, writers pop this group of words into a sentence to tell more about a noun.…

  11. Buying a New Car?

    Institute of Scientific and Technical Information of China (English)

    Paul; Maghielse

    2000-01-01

    You read it here first, folks: a car buying processthat first counsels its readers not to buy a car! Why?Because, no matter what mystical incantations a carsalesperson may whisper in your ear, cars are notinvestments. Certainly, there are a few exceptions to that rule,but in general. vehicles are what the accountantsamong us call depreciating assets. Think of a vehiclepurchase in comparison with the other big-ticketpurchases we make during our lifetimes. Buying a

  12. A Naturally Attractive Supermodel

    CERN Document Server

    Cohen, Timothy; Torroba, Gonzalo

    2012-01-01

    We propose an attractor mechanism which generates the "more minimal" supersymmetric standard model from a broad class of supersymmetry breaking boundary conditions. The hierarchies in the fermion masses and mixings are produced by the same dynamics and a natural weak scale results from gaugino mediation. These features arise from augmenting the standard model with a new SU(3) gauge group under which only the third generation quarks are charged. The theory flows to a strongly interacting fixed point which induces a negative anomalous dimension for the third generation quarks and a positive anomalous dimension for the Higgs. As a result, a split-family natural spectrum and the flavor hierarchies are dynamically generated.

  13. A Blue Lagoon Function

    DEFF Research Database (Denmark)

    Markvorsen, Steen

    2007-01-01

    We consider a specific function of two variables whose graph surface resembles a blue lagoon. The function has a saddle point $p$, but when the function is restricted to any given straight line through $p$ it has a {\\em{strict local minimum}} along that line at $p$.......We consider a specific function of two variables whose graph surface resembles a blue lagoon. The function has a saddle point $p$, but when the function is restricted to any given straight line through $p$ it has a {\\em{strict local minimum}} along that line at $p$....

  14. A Study on a Software Quality Assurance of a Process and a Product

    Energy Technology Data Exchange (ETDEWEB)

    Kim, Hyun Tae [Korea Atomic Energy Research Institute, Taejon (Korea, Republic of)

    2006-07-01

    Since nuclear plants and facilities have made increasing use of digital technology, the safety and reliability of software is a primary concern. Software errors are more difficult to detect and handle than hardware-related failures. It is crucial to consider the a process and a product of a software life cycle to increase the quality of a software. This paper discusses the quality assurance of a process and a product of a software life cycle based on two prominent standards, ISO 9001:2000 and CMMI.

  15. Shaping a Scientific Self

    DEFF Research Database (Denmark)

    Andrade-Molina, Melissa; Valero, Paola

    In this paper we illustrate how a truth circulates within social discourse. We examine a particular truth reproduced within science, that is: through the understanding of Euclid’s axioms and postulates a person will gain the access to all human knowledge. We deploy a discourse analysis that helps...... us to understand how a truth is reproduced, circulating among diverse fields of human knowledge. Also it will show why we accept and reproduce a particular discourse. Finally, we state Euclidean geometry as a truth that circulates in scientific discourse and performs a scientific self. We unfold...

  16. Hiding a neutron star inside a wormhole

    CERN Document Server

    Dzhunushaliev, Vladimir; Kleihaus, Burkhard; Kunz, Jutta

    2014-01-01

    We consider neutron-star-plus-wormhole configurations supported by a massless ghost scalar field. The neutron fluid is modeled by an anisotropic equation of state. When the central energy density of the fluid is of comparable magnitude to the one of the scalar field, configurations with an equator at the center and a double-throat arise. These double-throat wormholes can be either partially or completely filled by the neutron fluid. In the latter case, the passage of light - radiated by the neutron matter - through these wormholes is studied. A stability analysis indicates that all considered configurations are unstable with respect to linear perturbations, independent of whether the fluid is isotropic or anisotropic.

  17. Graduate curriculum: A need for a change

    Directory of Open Access Journals (Sweden)

    Sungatullina Dilyana D.

    2017-01-01

    Full Text Available Over the last couple of years there was an increase in graduates’ willingness to interleave their vocational careers with academic instruction at the university. Hence, the authors conducted evaluation and needs analysis of the skills crucial for graduate students to possess. The current study analyzed the attitude of 150 KFU IMEF graduates towards their core requirements within the framework of modern educational environment. The results showed that the majority of the respondents consider knowledge of teaching methodology (a new topic introduction, the material delivery, its further practice and revision, effective groupwork and public speaking to be of great importance. The paper concludes with suggestions on the need for the development and the introduction of a cutting-edge course at a Master’s level tailored to graduates to enhance the skills applicable not only in the professional field but the educational environment as well.

  18. Packing a cake into a box

    KAUST Repository

    Skopenkov, Mikhail

    2011-05-01

    Given a triangular cake and a box in the shape of its mirror image, how can the cake be cut into a minimal number of pieces so that it can be put into the box? The cake has icing, so we are not allowed to put it into the box upside down. V. G. Boltyansky asked this question in 1977 and showed that three pieces always suffice. In this paper we provide examples of cakes that cannot be cut into two pieces to be put into the box. This shows that three is the answer to Boltyansky\\'s question. We also give examples of cakes which can be cut into two pieces. © THE MATHEMATICAL ASSOCIATION OF AMERICA.

  19. A Conservative Approach to a Peripheral Ameloblastoma

    Directory of Open Access Journals (Sweden)

    Rocco Borrello

    2016-01-01

    Full Text Available Peripheral Ameloblastoma (PA is the rarest variant of ameloblastoma. It differs from the other subtypes of ameloblastoma in its localization: it arises in the soft tissues of the oral cavity coating the tooth bearing bones. Generally, it manifests nonaggressive behavior and it can be treated with complete removal by local conservative excision. In this study we report a case of PA of the maxilla in a 78-year-old female patient and we describe the four different histopathological patterns revealed by histological examination. After local excision and diagnosis, we planned a long term follow-up: in one year no recurrence had been reported. The choice of treatment is illustrated in Discussion.

  20. When is a word a word?

    Science.gov (United States)

    Vihman, M M; McCune, L

    1994-10-01

    Although adult-based words co-occur in the period of transition to speech with a variety of non-word vocalizations, little attention has been given to the formidable problem of identifying these earliest words. This paper specifies explicit, maximally 'inclusive' identification procedures, with criteria based on both phonetic and contextual parameters. A formal system for evaluating phonetic match is suggested, as well as a set of child-derived functional categories reflecting use in context. Analysis of word use across two samples of 10 children each, followed from 0;9 to 1;4, provides evidence to suggest that context-bound words can be 'trained' by focusing on eliciting language, but that the timing of context-flexible word use remains independent of such training.