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Sample records for actinium a

  1. Actinium

    International Nuclear Information System (INIS)

    Keller, C.

    1977-01-01

    There are only very few investigations dealing with the chemical and physical properties of actinium, the lanthanum homologue in the actinide series, 227 Ac, the only long-lived isotope can be produced in gram amounts only by neutron irradiation of 226 Ra, the amounts occurring in nature are too low for isolation (about 1 μg 227 Ac/1 uranium ore). Experimental work with 227 Ac gives rise to a lot of problems due to the radiation characteristics of the 227 Ac daughter nuclides. Therefore, the metal and the only ten solid compounds, prepared up to now, have been isolated in the microgram scale. Due to the high specific activity of 227 Ac, the preparation of a lot of compounds, e.g. metal-organic compounds seems to be very difficult, if not impossible. The properties of actinium in aqueous solutions have been deduced from experiments in the tracer scale only. The present investigations on actinium show that only the oxidation state + 3 exists - only radiopolarographic studies indicate the possibility of a lower valancy state (Ac 2+ ). - This review will give a critical and comprehensive description on the present knowledge about this element. The presently decreasing interest in the development of thermionic batteries using 227 Ac 2 O 3 radionuclide also implies that there will be only small progress in the chemistry of this radio-element in the near future. (orig.) [de

  2. Application of partition chromatography method for separation and analysis of actinium radionuclides

    International Nuclear Information System (INIS)

    Sinitsina, G.S.; Shestakova, I.A.; Shestakov, B.I.; Plyushcheva, N.A.; Malyshev, N.A.; Belyatskij, A.F.; Tsirlin, V.A.

    1979-01-01

    The method of partition chromatography is considered with the use of different extractants for the extraction of actinium-227, actinium-225 and actinium-228. It is advisable to extract actinium-227 from the irradiated radium with the help of D2FGFK. The use of 2DEGFK allows us to separate actinium-227 from alkaline and alkaline-earth elements. Amines have a higher radiative stability. An express-method has been developed for the identification of actinium-227 with TOA by its intrinsic α-emission in nonequilibrium preparations of irradiated radium-226 of small activity. Actinium-225 is extracted from uranium-233 with due regard for the fact that U, Th, and Ac are extracted differently by TBP from HNO 3 solutions. With the help of the given procedure one can reach the purifying coefficient of 10 4 . Actinium-228 is extracted from the radiummesothorium preparations by a deposition of decay products, including polonium-210 on the iron hydroxyde. Actinium-228 extraction from the mixture of radium radionuclides is performed by the partition chromatography method on D2EGFK. All the procedures for separation of actinium isotopes by the above methods are described

  3. Separation of protactinum, actinium, and other radionuclides from proton irradiated thorium target

    Science.gov (United States)

    Fassbender, Michael E.; Radchenko, Valery

    2018-04-24

    Protactinium, actinium, radium, radiolanthanides and other radionuclide fission products were separated and recovered from a proton-irradiated thorium target. The target was dissolved in concentrated HCl, which formed anionic complexes of protactinium but not with thorium, actinium, radium, or radiolanthanides. Protactinium was separated from soluble thorium by loading a concentrated HCl solution of the target onto a column of strongly basic anion exchanger resin and eluting with concentrated HCl. Actinium, radium and radiolanthanides elute with thorium. The protactinium that is retained on the column, along with other radionuclides, is eluted may subsequently treated to remove radionuclide impurities to afford a fraction of substantially pure protactinium. The eluate with the soluble thorium, actinium, radium and radiolanthanides may be subjected to treatment with citric acid to form anionic thorium, loaded onto a cationic exchanger resin, and eluted. Actinium, radium and radiolanthanides that are retained can be subjected to extraction chromatography to separate the actinium from the radium and from the radio lanthanides.

  4. Separation of actinium-227 from its daughter products by cationic resins technique

    International Nuclear Information System (INIS)

    Nastasi, M.J.C.

    1976-01-01

    A method for separating actinium-227 from its daughter products based on ion exchange principle is shown. Radionuclides mixture in perchloric acid 8,5 N and chloridric acid 0,5 N medium pass by a cationic resin column. Thorium-227 and actinium-227, which are retained by the resin, are eluted with nitric acid 6 N which releases actinium-227 while oxalic acid 7% is used for thorium-227 elution [pt

  5. The sorption of polonium, actinium and protactinium onto geological materials

    International Nuclear Information System (INIS)

    Baston, G.M.N.; Berry, J.A.; Brownsword, M.; Heath, T.G.; Ilett, D.J.; McCrohon, R.; Tweed, C.J.; Yui, M.

    1999-01-01

    This paper describes a combined experimental and modeling program of generic sorption studies to increase confidence in the performance assessment for a potential high-level radioactive waste repository in Japan. The sorption of polonium, actinium and protactinium onto geological materials has been investigated. Sorption of these radioelements onto bentonite, tuff and granodiorite from equilibrated de-ionized water was studied under reducing conditions at room temperature. In addition, the sorption of actinium and protactinium was investigated at 60 C. Thermodynamic chemical modeling was carried out to aid interpretation of the results

  6. The sorption of polonium, actinium and protactinium onto geological materials

    Energy Technology Data Exchange (ETDEWEB)

    Baston, G.M.N.; Berry, J.A.; Brownsword, M.; Heath, T.G.; Ilett, D.J.; McCrohon, R.; Tweed, C.J.; Yui, M.

    1999-07-01

    This paper describes a combined experimental and modeling program of generic sorption studies to increase confidence in the performance assessment for a potential high-level radioactive waste repository in Japan. The sorption of polonium, actinium and protactinium onto geological materials has been investigated. Sorption of these radioelements onto bentonite, tuff and granodiorite from equilibrated de-ionized water was studied under reducing conditions at room temperature. In addition, the sorption of actinium and protactinium was investigated at 60 C. Thermodynamic chemical modeling was carried out to aid interpretation of the results.

  7. A Radium-223 microgenerator from cyclotron-produced trace Actinium-227

    International Nuclear Information System (INIS)

    Abou, Diane S.; Pickett, Juile; Mattson, John E.; Thorek, Daniel L.J.

    2017-01-01

    The alpha particle emitter Radium-223 dichloride ("2"2"3RaCl_2) has recently been approved for treatment of late-stage bone metastatic prostate cancer. There is considerable interest in studying this new agent outside of the clinical setting, however the supply of "2"2"3Ra is limited and expensive. We have engineered a "2"2"3Ra microgenerator using traces of "2"2"7Ac previously generated from cyclotron-produced "2"2"5Ac. Radiochemically pure "2"2"3RaCl_2 was made, characterized, evaluated in vivo, and the source was recovered in high yield for regeneration of the microgenerator. - Highlights: • A "2"2"3Ra microgenerator was built using residual "2"2"7Ac from cyclotron-produced "2"2"5Ac. • Following "2"2"5Ac decay, the residual "2"2"7Ac was processed into pure "2"2"3Ra. • "2"2"7Ac and "2"2"7Th were recovered in high yield for a permanent supply of "2"2"3Ra. • Clinically supplied and generator-produced "2"2"3Ra have equivalent in vivo distribution. • Microdose column provides sufficient material for research use.

  8. Separation of Actinium 227 from the uranium minerals

    International Nuclear Information System (INIS)

    Martinez-Tarango, S.

    1991-01-01

    The purpose of this work was to separate Actinium 227, whose content is 18%, from the mineral carnotite found in Gomez Chihuahua mountain range in Mexico. The mineral before processing is is pre-concentrated and passed, first through anionic exchange resins, later the eluate obtained is passed through cationic resins. The resins were 20-50 MESH QOWEX and 100-200 MESH 50 X 8-20 in some cased 200-400 MESH AG 50W-X8, 1X8 in other cases. The eluates from the ionic exchange were electrodeposited on stainless steel polished disc cathode and platinum electrode as anode; under a current ODF 10mA for 2.5 to 5 hours and of 100mA for .5 of an hour. it was possible to identify the Actinium 227 by means of its descendents, TH-227 and RA-223, through alpha spectroscopy. Due to the radiochemical purity which the electro deposits were obtained the Actinium 227 was low and was not quantitatively determined. A large majority of the members of the natural radioactive series 3 were identified and even alpha energies reported in the literature with very low percentages of non-identified emissions were observed. We conclude that a more precise study is needed concerning ionic exchange and electrodeposit to obtain an Actinium 227 of radiochemical purity. (Author)

  9. Amides with nitrogenous heterocyclic substituent, their manufacturing process and their use to draw out selectively Actinium series (III) and to separate them in particular from Lanthanides (III)

    International Nuclear Information System (INIS)

    Cuillerdier, C.; Musikas, C.

    1993-01-01

    Present invention is concerned with new amides with nitrogenous heterocyclic substituent utilizable to separate trivalent actinium series from trivalent lanthanides. In these molecules, it is possible to obtain particularly covalent liaison which has more affinity with 5f series, that is to say actinium series; included a manufacturing process for these amides with nitrogenous heterocyclic substituent

  10. 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

  11. Purification of radium-226 for the manufacturing of actinium-225 in a cyclotron for alpha-immunotherapy

    International Nuclear Information System (INIS)

    Marx, Sebastian Markus

    2014-01-01

    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.

  12. 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.

  13. 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.

  14. Actinium-225 and Bismuth-213 Alpha Particle Immunotherapy of Cancer

    International Nuclear Information System (INIS)

    Scheinberg, D.

    2013-01-01

    Nuclides with appropriate half-lives and emission characteristics that would be potent enough to kill neoplastic cells in the small quantities that reach targets in vivo, include the high linear energy transfer (LET) alpha emitters such as Actinium-225 and Bi-213. We developed methods for the attachment of radiometals via bifunctional chelates to monoclonal antibodies (mAb) without loss of immunoreactivity. We developed alphaemitting Bi-213 lintuzumab constructs, characterized and qualified them in preclinical models, and took them into human clinical trials in patients with AML. Safety, anti-leukemic activity, and complete responses (CR’s) have been demonstrated through phase 2 trilas. Bi-213 is produced in a portable small generator device based on Ac- 225 in the hospital nuclear medicine lab. The isotope is then purified, attached to the antibody, and the product is qualified and processed. Despite this success, the major obstacle to the widespread use of these drugs remains the short 213 Bi half-life (46 minutes), which poses a large logistical hurdle before injection and limits its delivery to only the most accessible cancer cells after injection

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

    International Nuclear Information System (INIS)

    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

  16. Short history of radioactivity. No. XIII. The actinium and thorium series

    Energy Technology Data Exchange (ETDEWEB)

    Chalmers, T W

    1950-06-16

    Discussions of the actinium disintegration series (about 1905), the /sup 235/U or actinium series (as it is accepted today), the disintegration of thorium (about 1905), the thorium series in the modern form, and the 4n, 4n + 1, 4n + 2, and 4n + 3 series are presented.

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

    International Nuclear Information System (INIS)

    Raeder, S.; Bastin, B.; Block, M.; Creemers, P.; Delahaye, P.; Ferrer, R.; Fléchard, X.; Franchoo, S.; Ghys, L.; Gaffney, L.P.; Granados, C.; Heinke, R.; Hijazi, L.

    2016-01-01

    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.

  18. 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.

  19. Linear free energy relationship applied to trivalent cations with lanthanum and actinium oxide and hydroxide structure

    International Nuclear Information System (INIS)

    Ragavan, Anpalaki J.

    2006-01-01

    Linear free energy relationships for trivalent cations with crystalline M 2 O 3 and, M(OH) 3 phases of lanthanides and actinides were developed from known thermodynamic properties of the aqueous trivalent cations, modifying the Sverjensky and Molling equation. The linear free energy relationship for trivalent cations is as ΔG f,MvX 0 =a MvX ΔG n,M 3+ 0 +b MvX +β MvX r M 3+ , where the coefficients a MvX , b MvX , and β MvX characterize a particular structural family of MvX, r M 3+ is the ionic radius of M 3+ cation, ΔG f,MvX 0 is the standard Gibbs free energy of formation of MvX and ΔG n,M 3+ 0 is the standard non-solvation free energy of the cation. The coefficients for the oxide family are: a MvX =0.2705, b MvX =-1984.75 (kJ/mol), and β MvX =197.24 (kJ/molnm). The coefficients for the hydroxide family are: a MvX =0.1587, b MvX =-1474.09 (kJ/mol), and β MvX =791.70 (kJ/molnm).

  20. The marine geochemistry of actinium-227: Evidence for its migration through sediment pore water

    International Nuclear Information System (INIS)

    Nozaki, Yoshiyuki; Yamada, Masatoshi; Nikaido, Hirofumi

    1990-01-01

    227 Ac with a half life of 21.8 years has a potential utility as a tracer of deep water circulation and mixing studies on time scales less than 100 years. Here the authors present the first measurement of 227 Ac profile in the pore water of Northwest Pacific deep-sea sediment and in the ∼10,000 m long water column of Izu-Ogasawara Trench. The results clearly show that 227 Ac is supplied from the sediment to the overlying water through migration in the pore water. The model calculation indicates that the molecular diffusion alone through sediment porewater can support only a half of the standing crop of excess 227 Ac in the water column and the enhanced supply of 227 Ac by particle mixing is necessary to account for the remainder. Thus, bioturbation in the deep sea plays an important role in controlling the flux of some short-lived radionuclides such as 227 Ac and 228 Ra across the sediment-water interface

  1. An eighteen-membered macrocyclic ligand for actinium-225 targeted alpha therapy

    International Nuclear Information System (INIS)

    Thiele, Nikki A.; MacMillan, Samantha N.; Wilson, Justin J.; Rodriguez-Rodriguez, Cristina

    2017-01-01

    The 18-membered macrocycle H 2 macropa was investigated for 225 Ac chelation in targeted alpha therapy (TAT). Radiolabeling studies showed that macropa, at submicromolar concentration, complexed all 225 Ac (26 kBq) in 5 min at RT. [ 225 Ac(macropa)] + remained intact over 7 to 8 days when challenged with either excess La 3+ ions or human serum, and did not accumulate in any organ after 5 h in healthy mice. A bifunctional analogue, macropa-NCS, was conjugated to trastuzumab as well as to the prostate-specific membrane antigen-targeting compound RPS-070. Both constructs rapidly radiolabeled 225 Ac in just minutes at RT, and macropa-Tmab retained >99 % of its 225 Ac in human serum after 7 days. In LNCaP xenograft mice, 225 Ac-macropa-RPS-070 was selectively targeted to tumors and did not release free 225 Ac over 96 h. These findings establish macropa to be a highly promising ligand for 225 Ac chelation that will facilitate the clinical development of 225 Ac TAT for the treatment of soft-tissue metastases. (copyright 2017 Wiley-VCH Verlag GmbH and Co. KGaA, Weinheim)

  2. An eighteen-membered macrocyclic ligand for actinium-225 targeted alpha therapy

    Energy Technology Data Exchange (ETDEWEB)

    Thiele, Nikki A.; MacMillan, Samantha N.; Wilson, Justin J. [Cornell Univ., Ithaca, NY (United States). Chemistry and Chemical Biology; Brown, Victoria; Jermilova, Una; Ramogida, Caterina F.; Robertson, Andrew K.H.; Schaffer, Paul; Radchenko, Valery [TRIUMF, Vancouver, BC (Canada). Life Science Div.; Kelly, James M.; Amor-Coarasa, Alejandro; Nikolopoulou, Anastasia; Ponnala, Shashikanth; Williams, Clarence Jr.; Babich, John W. [Radiology, Weill Cornell Medicine, New York, NY (United States); Rodriguez-Rodriguez, Cristina [British Columbia Univ., Vancouver, BC (Canada). Dept. of Physics and Astronomy and Centre for Comparative Medicine

    2017-11-13

    The 18-membered macrocycle H{sub 2}macropa was investigated for {sup 225}Ac chelation in targeted alpha therapy (TAT). Radiolabeling studies showed that macropa, at submicromolar concentration, complexed all {sup 225}Ac (26 kBq) in 5 min at RT. [{sup 225}Ac(macropa)]{sup +} remained intact over 7 to 8 days when challenged with either excess La{sup 3+} ions or human serum, and did not accumulate in any organ after 5 h in healthy mice. A bifunctional analogue, macropa-NCS, was conjugated to trastuzumab as well as to the prostate-specific membrane antigen-targeting compound RPS-070. Both constructs rapidly radiolabeled {sup 225}Ac in just minutes at RT, and macropa-Tmab retained >99 % of its {sup 225}Ac in human serum after 7 days. In LNCaP xenograft mice, {sup 225}Ac-macropa-RPS-070 was selectively targeted to tumors and did not release free {sup 225}Ac over 96 h. These findings establish macropa to be a highly promising ligand for {sup 225}Ac chelation that will facilitate the clinical development of {sup 225}Ac TAT for the treatment of soft-tissue metastases. (copyright 2017 Wiley-VCH Verlag GmbH and Co. KGaA, Weinheim)

  3. New method for large scale production of medically applicable Actinium-225 and Radium-223

    International Nuclear Information System (INIS)

    Aliev, R.A.; Vasilyev, A.N.; Ostapenko, V.; Kalmykov, S.N.; Zhuikov, B.L.; Ermolaev, S.V.; Lapshina, E.V.

    2014-01-01

    Alpha-emitters ( 211 At, 212 Bi, 213 Bi, 223 Ra, 225 Ac) are promising for targeted radiotherapy of cancer. Only two alpha decays near a cell membrane result in 50% death of cancer cell and only a single decay inside the cell is required for this. 225 Ac may be used either directly or as a mother radionuclide in 213 Bi isotope generator. Production of 225 Ac is provided by three main suppliers - Institute for Transuranium Elements in Germany, Oak Ridge National Laboratory in USA and Institute of Physics and Power Engineering in Obninsk, Russia. The current worldwide production of 225 Ac is approximately 1.7 Ci per year that corresponds to only 100-200 patients that could be treated annually. The common approach for 225 Ac production is separation from mother 229 Th or irradiation of 226 Ra with protons in a cyclotron. Both the methods have some practical limitations to be applied routinely. 225 Ac can be also produced by irradiation of natural thorium with medium energy protons . Cumulative cross sections of 225 Ac, 227 Ac, 227 Th, 228 Th formations have been obtained recently. Thorium targets (1-9 g) were irradiated by 114-91 MeV proton beam (1-50 μA) at INR linear accelerator. After dissolution in 8 M HNO 3 + 0.004 M HF thorium was removed by double LLX by HDEHP in toluene (1:1). Ac and REE were pre-concentrated and separated from Ra and most fission products by DGA-Resin (Triskem). After washing out by 0.01 M HNO 3 Ac was separated from REE by TRU Resin (Triskem) in 3 M HNO 3 media. About 6 mCi 225 Ac were separated in hot cell with chemical yield 85%. The method may be upscaled for production of Ci amounts of the radionuclide. The main impurity is 227 Ac (0.1% at the EOB) but it does not hinder 225 Ac from being used for medical 225 Ac/ 213 Bi generators. (author)

  4. 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

  5. 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.)

  6. Kinetics of radioisotope exchange between brine and rock in a geothermal system

    International Nuclear Information System (INIS)

    Hammond, D.E.; Zukin, J.G.; Teh-Lung Ku

    1988-01-01

    A wide range of isotopes in the /sup 238/U, /sup 235/U, and /sup 232/Th decay chains was measured in geothermal brines collected from two production zones at 1898 and 3220 m in the Salton Sea Scientific Drilling Project well. High concentrations of radium, radon, and lead isotopes are generated and maintained by the input of these isotopes from solid phases into brine by both recoil and leaching processes, by the high chloride content of the brine which complexes radium and lead, and by the apparent absence of suitable unoccupied adsorption sites. In contrast, uranium, thorium, actinium, bismuth, and polonium isotopes all have low concentrations due to their efficient sorption from brine to rock. Measurements of short-lived isotopes in these decay series yield insights regarding the mechanisms controlling radioisotope exchange, and they permit estimation of rates of brine-rock interaction. For example, the /sup 228/Ac//sup 228/Ra activity ratio of 0.2 in brines indicates that the mean residence time of actinium in solution before sorption onto solid surfaces is less than 2.5 hours

  7. A study of uranium and thorium migration at the Koongarra uranium deposit with application to actinide transport from nuclear waste repositories

    International Nuclear Information System (INIS)

    Payne, T.E.

    1991-01-01

    One way to gain confidence in modelling possible radionuclide releases is to study natural systems which are similar to components of the multibarrier waste repository. Several such analogues are currently under study and these provide useful data about radionuclide behaviour in the natural environment. One such system is the Koongarra uranium deposit in the Northern Territory. In this dissertation, the migration of actinides, primarily uranium and thorium, has been studied as an analogue for the behaviour of transuranics in the far-field of a waste repository. The major findings of this study are: 1. the main process retarding uranium migration in the dispersion fan at Koongarra is sorption, which suppresses dissolved uranium concentrations well below solubility limits, with ferrihydrite being a major sorbing phase; 2. thorium is extremely immobile, with very low dissolved concentrations and corresponding high distribution ratios for 230 Th. Overall, it is estimated that colloids are relatively unimportant in Koongarra groundwater. Uranium migrates mostly as dissolved species, whereas thorium and actinium are mostly adsorbed to larger, relatively immobile particles and the stationary phase. However, of the small amount of 230 Th that passes through a 1μm filter, a significant proportion is associated with colloidal particles. Actinium appears to be slightly more mobile than thorium and is associated with colloids to a greater extent, although generally present in low concentrations. These results support the possibility of colloidal transport of trivalent and tetravalent actinides in the vicinity of a nuclear waste repository. 112 refs., 23 tabs., 32 figs

  8. A neutron source of variable fluence

    International Nuclear Information System (INIS)

    Brachet, Guy; Demichel, Pascal; Prigent, Yvon; Riche, J.C.

    1975-01-01

    The invention concerns a variable fluence neutron source, like those that use in the known way a reaction between a radioactive emitter and a target, particularly of type (α,n). The emitter being in powder form lies in a carrier fluid forming the target, inside a closed containment. Facilities are provided to cause the fluidisation of the emitter by the carrier fluid in the containment. The fluidisation of the emitting powder is carried out by a booster with blades, actuated from outside by a magnetic coupling. The powder emitter is a α emitter selected in the group of curium, plutonium, thorium, actinium and americium oxides and the target fluid is formed of compounds of light elements selected from the group of beryllium, boron, fluorine and oxygen 18. The target fluid is a gas used under pressure or H 2 O water highly enriched in oxygen 18 [fr

  9. 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.)

  10. Natural radionuclides in soils of a forest fragment of Atlantic Forest under ecological restoration process

    International Nuclear Information System (INIS)

    Ferreira, F.S.; Lira, M.B.; Souza, E.M.; França, E.J.

    2017-01-01

    The natural radioactive isotopes come from the radioactive series of the 238 U (Uranium Series), the 235 U (Actinium Series) and the 232 Th (Thorium Series) series, or they can occur in isolation as is the case with the 40 K. Primordial radionuclides such as 40 K, 232 Th, 235 U and 238 U exist since the formation of the earth, being found in appreciable amounts in nature and in some cases may present a mass activity above the acceptable of environmental radiation. The objective of this work was to evaluate the mass activity of 40 K, 226 Ra and 228 Ra in the soils of a fragment of Atlantic Forest under ecological restoration process located in the Municipality of Paulista, PE, Brazil. Soil samples (0 - 15 cm) were collected under the projection of the treetops of the most abundant trees in the region. After drying and comminution, analytical portions of 40 g were transferred to polyethylene petri dishes, sealed and stored for 30 days to ensure secular equilibrium. Radioactivity was quantified by High Resolution Gamma Spectrometry - EGAR. The mean physical activities of 40 K, 226 Ra and 228 Ra were 12, 15 and 20 Bq kg -1 , respectively, for the surface soil of the Parque Natural Municipal Mata do Frio. The values found were lower than those found in mangroves in the state of Pernambuco and those considered normal for soils worldwide

  11. Distribution of trace elements in land plants and botanical taxonomy with special reference to rare earth elements and actinium

    International Nuclear Information System (INIS)

    Koyama, Mutsuo

    1989-01-01

    Distribution profiles of trace elements in land plants were studied by neutron activation analysis and radioactivity measurements without activation. Number of botanical samples analyzed were more than three thousand in which more than three hundred botanical species were included. New accumulator plants of Co, Cr, Zn, Cd, rare earth elements, Ac, U, etc., were found. Capabilities of accumulating trace elements can be related to the botanical taxonomy. Discussions are given from view points of inorganic chemistry as well as from botanical physiology

  12. Review on transactinium isotope build-up and decay in reactor fuel and related sensitivities to cross section changes and results and main conclusions of the IAEA-Advisory Group Meeting on Transactinium Nuclear Data, held at Karlsruhe, November 1975

    International Nuclear Information System (INIS)

    Kuesters, H.; Lalovic, M.

    1976-04-01

    In this report a review is given on the actinium isotope build-up and decay in LWRs, LMFBRs and HTRs. The dependence of the corresponding physical aspects on reactor type, fuel cycle strategy, calculational methods and cross section uncertainties is discussed. Results from postirradiation analyses and from integral experiments in fast zero power assemblies are compared with theoretical predictions. Some sensitivity studies about the influence of actinium nuclear data uncertainties on the isotopic concentration, decay heat, and the radiation out-put in fuel and waste are presented. In a second part, the main results of the IAEA-Advisory Group Meeting on Transactinium Nuclear Data are summarized and discussed. (orig.) [de

  13. Natural radionuclides in soils of a forest fragment of Atlantic Forest under ecological restoration process; Radionuclídeos naturais em solos de um fragmento florestal de Mata Atlântica sob processo de restauração ecológica

    Energy Technology Data Exchange (ETDEWEB)

    Ferreira, F.S.; Lira, M.B.; Souza, E.M.; França, E.J., E-mail: biologofabiano10@gmail.com [Centro Regional de Ciências Nucleares do Nordeste (CRCN-NE/CNEN-PE), Recife, PE (Brazil)

    2017-07-01

    The natural radioactive isotopes come from the radioactive series of the {sup 238}U (Uranium Series), the {sup 235}U (Actinium Series) and the {sup 232}Th (Thorium Series) series, or they can occur in isolation as is the case with the {sup 40}K. Primordial radionuclides such as {sup 40}K, {sup 232}Th, {sup 235}U and {sup 238}U exist since the formation of the earth, being found in appreciable amounts in nature and in some cases may present a mass activity above the acceptable of environmental radiation. The objective of this work was to evaluate the mass activity of {sup 40}K, {sup 226}Ra and {sup 228}Ra in the soils of a fragment of Atlantic Forest under ecological restoration process located in the Municipality of Paulista, PE, Brazil. Soil samples (0 - 15 cm) were collected under the projection of the treetops of the most abundant trees in the region. After drying and comminution, analytical portions of 40 g were transferred to polyethylene petri dishes, sealed and stored for 30 days to ensure secular equilibrium. Radioactivity was quantified by High Resolution Gamma Spectrometry - EGAR. The mean physical activities of {sup 40}K, {sup 226}Ra and {sup 228}Ra were 12, 15 and 20 Bq kg{sup -1}, respectively, for the surface soil of the Parque Natural Municipal Mata do Frio. The values found were lower than those found in mangroves in the state of Pernambuco and those considered normal for soils worldwide.

  14. 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.

  15. Minor Actinide Burning in Thermal Reactors. A Report by the Working Party on Scientific Issues of Reactor Systems

    International Nuclear Information System (INIS)

    Hesketh, K.; Porsch, D.; Rimpault, G.; Taiwo, T.; Worrall, A.

    2013-01-01

    The actinides (or actinoids) are those elements in the periodic table from actinium upwards. Uranium (U) and plutonium (Pu) are two of the principal elements in nuclear fuel that could be classed as major actinides. The minor actinides are normally taken to be the triad of neptunium (Np), americium (Am) and curium (Cm). The combined masses of the remaining actinides (i.e. actinium, thorium, protactinium, berkelium, californium, einsteinium and fermium) are small enough to be regarded as very minor trace contaminants in nuclear fuel. Those elements above uranium in the periodic table are known collectively as the transuranics (TRUs). The operation of a nuclear reactor produces large quantities of irradiated fuel (sometimes referred to as spent fuel), which is either stored prior to eventual deep geological disposal or reprocessed to enable actinide recycling. A modern light water reactor (LWR) of 1 GWe capacity will typically discharge about 20-25 tonnes of irradiated fuel per year of operation. About 93-94% of the mass of uranium oxide irradiated fuel is comprised of uranium (mostly 238 U), with about 4-5% fission products and ∼1% plutonium. About 0.1-0.2% of the mass is comprised of neptunium, americium and curium. These latter elements accumulate in nuclear fuel because of neutron captures, and they contribute significantly to decay heat loading and neutron output, as well as to the overall radio-toxic hazard of spent fuel. Although the total minor actinide mass is relatively small - approximately 20-25 kg per year from a 1 GWe LWR - it has a disproportionate impact on spent fuel disposal, and thus the longstanding interest in transmuting these actinides either by fission (to fission products) or neutron capture in order to reduce their impact on the back end of the fuel cycle. The combined masses of the trace actinides actinium, thorium, protactinium, berkelium and californium in irradiated LWR fuel are only about 2 parts per billion, which is far too low for

  16. Status of liquid metal reactor development in the United States of America

    International Nuclear Information System (INIS)

    Griffith, J.D.; Horton, K.E.

    1991-01-01

    An existing network of government and industry research facilities and engineering test centers in the United States is currently providing test capabilities and the technical expertise required to conduct an aggressive advanced reactor development program. Subsequent to the directive to shut down the Fast Flux Test Facility in early 1990, a variety of activities were undertaken to provide support for continued operation. The United States has made substantial progress in achieving ALMR program objectives. The metal fuel cycle is designed to recycle and burn its own actiniums, and has the potential to be a very effective burner of actiniums generated in the LWRs. The current emphasis in the IFR Program is on the comprehensive development of the IFR (Integral Fast Reactor) technology, to be followed by a period of technology demonstration which would verify the economic feasibility of the concept. The United States has been active in international cooperative activities in the fast reactor sector since 1969. (author). 11 figs, 1 tab

  17. LASL experience in decontamination of the environment

    International Nuclear Information System (INIS)

    Ahlquist, A.J.

    1981-01-01

    This discussion represents one part of a major effort in soil decontamination at the Los Alamos site. A contaminated industrial waste line in the Los Alamos townsite was removed, and a plutonium incineration facility, and a filter building contaminated with actinium-227 were dismantled. The former plutonium handling facility has been decontaminated, and canyons and an old firing site contaminated with strontium-90 have been surveyed

  18. Formation and evolution of ultrafine particles produced by radiolysis and photolysis

    International Nuclear Information System (INIS)

    Madelaine, G.J.; Perrin, M.L.; Renoux, A.

    1980-01-01

    Results are presented, concerning the formation, the size distribution, and the behavior of ultrafine particles produced by alpha disintegration of actinium and uv irradiation in filtered and natural atmospheric air. The characterization of these particles is obtained by electrical aerosol analyzer and diffusion battery method. Measurements are made in the range between 0.003 and 0.5 micrometer. Some qualitative indications are obtained on the different mechanisms which govern the evolution of ultrafine particles in the atmosphere (nucleation, coagulation, and condensation). It is now well established that the photo-oxydation of SO 2 in the atmosphere leads to the production of sulphuric acid and of sulphate, which are usually found in the form of submicronic particles. This paper concerns the evolution of ultrafine particles generated in the presence of a preexisting aerosol. They are either instantaneously produced by the alpha disintegrations of actinium 219 or continuously produced by the transformation of SO 2 under uv irradiation

  19. Sorption studies of radioelements on geological materials

    International Nuclear Information System (INIS)

    Berry, John A.; Yui, Mikazu; Kitamura, Akira

    2007-11-01

    Batch sorption experiments have been carried out to study the sorption of uranium, technetium, curium, neptunium, actinium, protactinium, polonium, americium and plutonium onto bentonite, granodiorite and tuff. Mathematical modelling using the HARPHRQ program and the HATCHES database was carried out to predict the speciation of uranium and technetium in the equilibrated seawater, and neptunium, americium and plutonium in the rock equilibrated water. Review of the literature for thermodynamic data for curium, actinium, protactinium and polonium was carried out. Where sufficient data were available, predictions of the speciation and solubility were made. This report is a summary report of the experimental work conducted by AEA Technology during April 1991-March 1998, and the main results have been presented at Material Research Society Symposium Proceedings and published as proceedings of them. (author)

  20. 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

    International Nuclear Information System (INIS)

    2007-01-01

    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.)

  1. Behaviour of uranium series radionuclides in surface water (Crouzille, Limousin). Geochemical implications

    International Nuclear Information System (INIS)

    Moulin, J.

    2008-06-01

    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 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)

  2. Investigation of the origin of elements of the uranium-235 family noticed in excess around the EL4 experimental nuclear reactor during its dismantling. Site of the Monts d'Arree - Brennilis (29) power plant. Years 2007-2008. Report and appendices with results

    International Nuclear Information System (INIS)

    2009-02-01

    The presence of actinium-227 has been noticed in the Mont d'Arree region (Finistere district) and such a presence in the environment had never been reported before. Thus, a study has been performed to investigate the origin of this element: about 300 samples have been analysed. After an indication of the investigation chronology, the report outlines that there is no relationship between the excess of actinium-227 and land amendment or embankments, that there is no obvious relationship between this presence and radioactive liquid effluents or atmospheric effluents from the Brennilis nuclear site. It shows that there is an obvious relationship with the radiological quality. It states that this excess of actinium 227 is related to the management of rain waters about the Brennilis site. An appendix specifies the location, nature and agenda of samplings (bio-indicators, samplings in sludge, soils, food and tap water, aquatic foams and sediments, ponds, wet lands, and at the vicinity of the power plant channel), presents detailed results obtained by gamma spectrometry, and measurement equipment and methods

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

    International Nuclear Information System (INIS)

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

    2014-01-01

    Highlights: • Alluvium in Piedra de Lumbre basin higher radionuclides likely from natural Th. • Natural uranium decay-chain isotopes, including Ra, present in marine deposits. • Marine deposits also contain low concentrations of chromium. • Radionuclides and chromium concentrations lower in alluvium in the Las Flores basin. - Abstract: 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 238 U and its daughter 234 U. 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 232 Th, including its daughter 224 Ra. 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 δ 53 Cr 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

  4. 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

  5. Actinides

    International Nuclear Information System (INIS)

    Martinot, L.; Fuger, J.

    1985-01-01

    The oxidation behavior of the actinides is explained on the basis of their electronic structure. The actinide elements, actinium, thorium, protactinium, uranium, neptunium, plutonium, americium, curium, berkelium, californium, einsteinium, fermium, mendelevium, nobelium, and laurencium are included. For all except the last three elements, the points of discussion are oxidation states, Gibbs energies and potentials, and potential diagram for the element in acid solution; and thermodynamic properties of these same elements are tabulated. References are cited following discussion of each element with a total of 97 references being cited. 13 tables

  6. Status of the lanthanides and actinides in the periodic table

    International Nuclear Information System (INIS)

    Holden, N.E.

    1985-01-01

    In extended discussions and correspondence with Ekkehard Fluck, the author was made aware of a problem with the Periodic Table, i.e., which element should be shown in the main table as the representative of the lanthanide series and the actinide series. In earlier discussion, he came to the conclusion that lanthanum and actinium are not the elements which should appear, but rather lutetium and lawrencium are more appropriate for inclusion in their place. This paper will attempt to justify the reasons for the above conclusions. 4 refs

  7. Journal of Naval Science. Volume 2. Number 3. July 1976

    Science.gov (United States)

    1976-07-01

    supplementary food to the beakers containing stage VI nauplii: cyprids do not feed. The larvae in each beaker were con- fined within a close-fitting plastic...99-274% of Natural U) Uranium-234 (234U) (0-006% of Natural U) 2-48 X 10"’yrs Thorium-230 (230Th) Polonium -218(2I8Po) /through short lived...Natural U) Actinium-227 (--7Ac) FIG. 1. Nuclide chart. 4-51 X 10’Yrs 7 hours P 8 X 10’ Yrs 4 days Lead- 210 (210Pb) (22 yrs,/3"). 1-39 X 10

  8. 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.

  9. 'Masurium' and the 'early transuranium elements' or how discovery of nuclear fission was not clearly seen

    International Nuclear Information System (INIS)

    Keller, C.

    1988-01-01

    Fifty years after the discovery of fission, the scientific community is aware that this type of nuclear reaction could have been discovered more than a decade earlier. Noddack, Tacke and Berg announced in 1925 the discovery of elements Z = 43 (masurium) and rhenium (Z = 75), the first one could be detected only in U-bearing minerals. A recent re-examination by P.H.M. von Assche of the published data clearly showed that the original claim for element Z = 43 of the authors in 1925 was correct and, therefore, they detected not only element Z = 43 but also the first fission product. Because this discovery of element Z = 43 could not be repeated by other authors as that time, the scientific credibility of Noddack-Tacke was very low in order to give credit to her proposal that the 'early' transuranium elements by Enrico Fermi might also be fragments of known (lighter) elements. Enrico Fermi in 1934 obtained these 'early' (and as we today know: wrong) transuranium isotopes by irradiation of uranium with neutrons. A 'wrong' periodic system in the thirties which placed Th, Pa and U as 6d-elements and not as 5f-actinides chemically helped to consider these fission products as transuranium elements Z = 93/94. In 1937/38 I. Curie and P. Savitch discovered an 'actinium-nuclide' with 3,5 h half-life which, however, had properties similar to lanthanium and not to actinium, as they stated. (orig.) [de

  10. An aerial radiological survey of the Sandia National Laboratories and surrounding area

    International Nuclear Information System (INIS)

    Riedhauser, S.R.

    1994-06-01

    A team from the Remote Sensing Laboratory conducted an aerial radiological survey of the area surrounding the Sandia National Laboratories and Kirtland Air Force Base in Albuquerque, New Mexico, during March and April 1993. The survey team measured the terrestrial gamma radiation at the site to determine the levels of natural and man-made radiation. This survey includes the areas covered by a previous survey in 1981. The results of the aerial survey show a background exposure rate which varies between 5 and 18 μR/h plus an approximate 6 μR/h contribution from cosmic rays. The major radioactive isotopes found in this survey were: potassium-40, thallium-208, bismuth-214, and actinium-228, which are all naturally-occurring isotopes, and cobalt-60, cesium-137, and excess amounts of thallium-208 and actinium-228, which are due to human actions in the survey area. In regions away from man-made activity, the exposure rates inferred from this survey's gamma ray measurements agree almost exactly with the exposure rates inferred from the 1981 survey. In addition to the aerial measurements, another survey team conducted in situ and soil sample radiation measurements at three sites within the survey perimeter. These ground-based measurements agree with the aerial measurements within ± 5%

  11. Actinide metals

    Energy Technology Data Exchange (ETDEWEB)

    Brown, Paul L. [Geochem Australia, Kiama, NSW (Australia); Ekberg, Christian [Chalmers Univ. of Technology, Goeteborg (Sweden). Nuclear Chemistry/Industrial Materials Recycling

    2016-07-01

    All isotopes of actinium are radioactive and exist in aqueous solution only in the trivalent state. There have been very few studies on the hydrolytic reactions of actinium(III). The hydrolysis reactions for uranium would only be important in alkaline pH conditions. Thermodynamic parameters for the hydrolysis species of uranium(VI) and its oxide and hydroxide phases can be determined from the stability and solubility constants. The hydrolytic behaviour of neptunium(VI) is quite similar to that of uranium(VI). The solubility constant of NpO{sub 2}OH(am) has been reported a number of times for both zero ionic strength and in fixed ionic strength media. Americium can form four oxidation states in aqueous solution, namely trivalent, tetravalent, pentavalent and hexavalent. Desire, Hussonnois and Guillaumont determined stability constants for the species AmOH{sup 2+} for the actinides, plutonium(III), americium(III), curium(III), berkelium(III) and californium(III) using a solvent extraction technique.

  12. Actinide metals

    International Nuclear Information System (INIS)

    Brown, Paul L.; Ekberg, Christian

    2016-01-01

    All isotopes of actinium are radioactive and exist in aqueous solution only in the trivalent state. There have been very few studies on the hydrolytic reactions of actinium(III). The hydrolysis reactions for uranium would only be important in alkaline pH conditions. Thermodynamic parameters for the hydrolysis species of uranium(VI) and its oxide and hydroxide phases can be determined from the stability and solubility constants. The hydrolytic behaviour of neptunium(VI) is quite similar to that of uranium(VI). The solubility constant of NpO 2 OH(am) has been reported a number of times for both zero ionic strength and in fixed ionic strength media. Americium can form four oxidation states in aqueous solution, namely trivalent, tetravalent, pentavalent and hexavalent. Desire, Hussonnois and Guillaumont determined stability constants for the species AmOH 2+ for the actinides, plutonium(III), americium(III), curium(III), berkelium(III) and californium(III) using a solvent extraction technique.

  13. Development of ion beam sputtering techniques for actinide target preparation

    International Nuclear Information System (INIS)

    Aaron, W.S.; Zevenbergen, L.A.; Adair, H.L.

    1985-01-01

    Ion beam sputtering is a routine method for the preparation of thin films used as targets because it allows the use of minimum quantity of starting material, and losses are much lower than most other vacuum deposition techniques. Work is underway in the Isotope Research Materials Laboratory (IRML) at ORNL to develop the techniques that will make the preparation of actinide targets up to 100 μg/cm 2 by ion beam sputtering a routinely available service from IRML. The preparation of the actinide material in a form suitable for sputtering is a key to this technique, as is designing a sputtering system that allows the flexibility required for custom-ordered target production. At present, development work is being conducted on low-activity in a bench-top system. The system will then be installed in a hood or glove box approved for radioactive materials handling where processing of radium, actinium, and plutonium isotopes among others will be performed. (orig.)

  14. Process for radioisotope recovery and system for implementing same

    Science.gov (United States)

    Meikrantz, David H [Idaho Falls, ID; Todd, Terry A [Aberdeen, ID; Tranter, Troy J [Idaho Falls, ID; Horwitz, E Philip [Naperville, IL

    2009-10-06

    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. Proposed training program for construction personnel involved in remedial action work at sites contaminated by naturally occurring radionuclides

    International Nuclear Information System (INIS)

    Berven, B.A.; Goldsmith, W.A.; Haywood, F.F.; Schiager, K.J.

    1979-01-01

    Many sites used during the early days of the US atomic energy program are contaminated with radionuclides of the primordial decay chains (uranium, thorium, and actinium series). This contamination consists of residues resulting from refining and processing uranium and thorium. Preparation of these sites for release to unrestricted private use will involve the assistance of construction workers, many of whom have limited knowledge of the hazards associated with radioactive materials. Therefore, there is a need to educate these workers in the fundamentals of radioactive material handling to minimize exposures and possible spread of contamination. This training should disseminate relevant information at an appropriate educational level and should instill a cautious, common-sense attitude toward the handling of radioactive materials. The training should emphasize basic information concerning environmental radiation within a context of relative risk. A multi-media format, including colorful visual aids, demonstration, and discussion, should be used to maximize motivation and retention. A detailed, proposed training program design is presented

  16. How fission was discovered

    International Nuclear Information System (INIS)

    Fluegge, S.

    1989-01-01

    After the great survey of neutron induced radioactivity by Fermi and co-workers, the laboratories in Paris and Berlin-Dahlen tried to disentangle the complex results found in uranium. At that time neutron sources were small, activities low, and equipment very simple. Chemistry beyond uranium still was unknown. Hahn and Meitner believed to have observed three transuranic isomeric chains, a doubtful result even then. Early in 1938, Curie and Savic in Paris found an activity interpreted to be actinium, and Hahn and Meitner another to be radium. Both interpretations seemed impossible from energy considerations. Hahn and Strassmann, therefore, continued this work and succeeded to separate the new activity from radium. There remained no doubt that a barium isotope had been produced, the uranium nucleus splitting in the yet-unknown process we now call fission

  17. Radionuclide interactions with marine sediments

    International Nuclear Information System (INIS)

    Higgo, J.J.W.

    1987-09-01

    A critical review of the literature on the subject of the interactions of radionuclides with marine sediments has been carried out. On the basis of the information available, an attempt has been made to give ranges and 'best estimates' for the distribution ratios between seawater and sediments. These estimates have been based on an understanding of the sediment seawater system and the porewater chemistry and mineralogy. Field measurements, laboratory measurements and estimates based on stable-element geochemical data are all taken into account. Laboratory measurements include distribution-ratio and diffusion-coefficient determinations. The elements reviewed are carbon, chlorine, calcium, nickel, selenium, strontium, zirconium, niobium, technetium, tin, iodine, caesium, lead, radium, actinium, thorium, protactinium, uranium, neptunium, plutonium, americium and curium. (author)

  18. The chemistry of the actinide elements. Volume I

    International Nuclear Information System (INIS)

    Katz, J.J.; Seaborg, G.T.; Morss, L.R.

    1986-01-01

    The Chemistry of the Actinide Elements is a comprehensive, contemporary and authoritative exposition of the chemistry and related properties of the 5f series of elements: actinium, thorium, protactinium, uranium and the first eleven. This second edition has been completely restructured and rewritten to incorporate current research in all areas of actinide chemistry and chemical physics. The descriptions of each element include accounts of their history, separation, metallurgy, solid-state chemistry, solution chemistry, thermo-dynamics and kinetics. Additionally, separate chapters on spectroscopy, magnetochemistry, thermodynamics, solids, the metallic state, complex ions and organometallic compounds emphasize the comparative chemistry and unique properties of the actinide series of elements. Comprehensive lists of properties of all actinide compounds and ions in solution are given, and there are special sections on such topics as biochemistry, superconductivity, radioisotope safety, and waste management, as well as discussion of the transactinides and future elements

  19. 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)

    International Nuclear Information System (INIS)

    2006-01-01

    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 ( 227 Ac), non born by its ascendents which are 235 U and 231 Pa is observed. This phenomenon is characterized by mass activities superior to these ones of 235 U and able to reach these ones of 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 ( 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.)

  20. Shape of intrinsic alpha pulse height spectra in lanthanide halide scintillators

    Science.gov (United States)

    Wolszczak, W.; Dorenbos, P.

    2017-06-01

    Internal contamination with actinium-227 and its daughters is a serious drawback in low-background applications of lanthanide-based scintillators. In this work we showed the important role of nuclear γ de-excitations on the shape of the internal alpha spectrum measured in scintillators. We calculated with Bateman equations the activities of contamination isotopes and the time evolution of actinium-227 and its progenies. Next, we measured the intrinsic background spectra of LaBr3(Ce), LaBr3(Ce,Sr) and CeBr3 with a digital spectroscopy technique, and we analyzed them with a pulse shape discrimination method (PSD) and a time-amplitude analysis. Finally, we simulated the α background spectrum with Geant4 tool-kit, consequently taking into account complex α-γ-electron events, the α / β ratio dependence on the α energy, and the electron/γ nonproportionality. We found that α-γ mixed events have higher light yield than expected for alpha particles alone, which leads to overestimation of the α / β ratio when it is measured with internal 227Th and 223Ra isotopes. The time-amplitude analysis showed that the α peaks of 219Rn and 215Po in LaBr3(Ce) and LaBr3(Ce,Sr) are not symmetric. We compared the simulation results with the measured data and provided further evidence of the important role of mixed α-γ-electron events for understanding the shape of the internal α spectrum in scintillators.

  1. Dissolved Concentration Limits of Radioactive Elements

    International Nuclear Information System (INIS)

    Y. Chen; E.R. Thomas; F.J. Pearson; P.L. Cloke; T.L. Steinborn; P.V. Brady

    2003-01-01

    The purpose of this study is to evaluate dissolved concentration limits (also referred to as solubility limits) of radioactive elements under possible repository conditions, based on geochemical modeling calculations using geochemical modeling tools, thermodynamic databases, and measurements made in laboratory experiments and field work. The scope of this modeling activity is to predict dissolved concentrations or solubility limits for 14 radioactive elements (actinium, americium, carbon, cesium, iodine, lead, neptunium, plutonium, protactinium, radium, strontium, technetium, thorium, and uranium), which are important to calculated dose. Model outputs are mainly in the form of look-up tables plus one or more uncertainty terms. The rest are either in the form of distributions or single values. The results of this analysis are fundamental inputs for total system performance assessment to constrain the release of these elements from waste packages and the engineered barrier system. Solubilities of plutonium, neptunium, uranium, americium, actinium, thorium, protactinium, lead, and radium have been re-evaluated using the newly updated thermodynamic database (Data0.ymp.R2). For all of the actinides, identical modeling approaches and consistent environmental conditions were used to develop solubility models in this revision. 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, activity coefficients, and selection of solubility controlling phase have been quantified or otherwise addressed. Moreover, a new blended plutonium solubility model has been developed in this revision, which gives a mean solubility that is three orders of magnitude lower than the plutonium solubility model used for the Total System Performance Assessment for the Site Recommendation. Two alternative neptunium solubility models have also been

  2. Dissolved Concentration Limits of Radioactive Elements

    Energy Technology Data Exchange (ETDEWEB)

    Y. Chen; E.R. Thomas; F.J. Pearson; P.L. Cloke; T.L. Steinborn; P.V. Brady

    2003-06-20

    The purpose of this study is to evaluate dissolved concentration limits (also referred to as solubility limits) of radioactive elements under possible repository conditions, based on geochemical modeling calculations using geochemical modeling tools, thermodynamic databases, and measurements made in laboratory experiments and field work. The scope of this modeling activity is to predict dissolved concentrations or solubility limits for 14 radioactive elements (actinium, americium, carbon, cesium, iodine, lead, neptunium, plutonium, protactinium, radium, strontium, technetium, thorium, and uranium), which are important to calculated dose. Model outputs are mainly in the form of look-up tables plus one or more uncertainty terms. The rest are either in the form of distributions or single values. The results of this analysis are fundamental inputs for total system performance assessment to constrain the release of these elements from waste packages and the engineered barrier system. Solubilities of plutonium, neptunium, uranium, americium, actinium, thorium, protactinium, lead, and radium have been re-evaluated using the newly updated thermodynamic database (Data0.ymp.R2). For all of the actinides, identical modeling approaches and consistent environmental conditions were used to develop solubility models in this revision. 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, activity coefficients, and selection of solubility controlling phase have been quantified or otherwise addressed. Moreover, a new blended plutonium solubility model has been developed in this revision, which gives a mean solubility that is three orders of magnitude lower than the plutonium solubility model used for the Total System Performance Assessment for the Site Recommendation. Two alternative neptunium solubility models have also been

  3. The production of radioisotopes with a betatron using an internal bombarding technique; Production de radioisotopes par bombardement interne dans un betatron; Proizvodstvo radioizotopov s pomoshch'yu betatrona s ispol'zovaniem metoda vnutrennej bombardirovki; Obtencion de radioisotopos por bombardeo interno en el betatron

    Energy Technology Data Exchange (ETDEWEB)

    Morinaga, H [Department of Physics, Tohoku University, Sendai (Japan)

    1962-01-15

    des cibles internes n'a ete employee que pour les travaux de spectroscopie nucleaire; elle a permis d'identifier huit nouvelles especes d'isotopes radioactifs (cobalt-63, gallium-75, arsenic-81, indium-121, indium-123, thulium-173, thulium-175 et actinium-231) et de decouvrir plusieurs nouveaux isomeres. L'efficacite de cette technique de bombardement ouvre de nouvelles perspectives, car les betatrons employes a des fins medicales ou industrielles ou pour la recherche peuvent aussi servir a la production de radioelements. Les radioisotopes de courte periode sont souvent plus commodes a utiliser dans diverses applications en raison de leur desintegration rapide et des rayonnements de haute energie qu'ils emettent, et peuvent etre fabriques facilement sans exiger d'operations compliquees. (author) [Spanish] El autor ha ideado y empleado con exito un nuevo metodo para obtener en el betatron radioisotopos de elevada actividad especifica. Los materiales que se desee activar se colocan en el extremo de una varilla que se introduce desde el exterior en el tubo toroidal, y se irradian a la presion de una atmosfera en un lugar situado inmediatamente detras clel blanco que emite las radiaciones de frenado, en el que la intensidad de las radiaciones es extremadamente elevada. El autor produjo en una pieza pequena de cobre una actividad de saturacion de {sup 62}Cu superior a un milicurie, y la actividad especifica mas elevada que pudo alcanzar era unas 500 veces mayor que la obtenida con ayuda de los dispositivos corrientes. Por ahora, la tecnica del blanco interior solo se emplea para trabajos de espectroscopia nuclear. El autor ha Identificado por este metodo ocho nuevas especies radioisotopicas ({sup 63}Co, {sup 75}Ga, {sup 81}As, {sup 121}In, {sup 123}In, {sup 173}Tm, {sup 175}Tm y {sup 231}Ac) y ha encontrado varios nuevos isomeros. Esta tecnica de bombardeo abre posibilidades nuevas porque los betatrones que hoy se emplean en medicina, en la industria o en la investigacion

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

    International Nuclear Information System (INIS)

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

    2004-01-01

    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

  5. 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)

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

    International Nuclear Information System (INIS)

    Segre, Nadia; Fagundes, Rosane Correa

    2013-01-01

    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)

  7. Development of ion beam sputtering techniques for actinide target preparation

    Science.gov (United States)

    Aaron, W. S.; Zevenbergen, L. A.; Adair, H. L.

    1985-06-01

    Ion beam sputtering is a routine method for the preparation of thin films used as targets because it allows the use of a minimum quantity of starting material, and losses are much lower than most other vacuum deposition techniques. Work is underway in the Isotope Research Materials Laboratory (IRML) at ORNL to develop the techniques that will make the preparation of actinide targets up to 100 μg/cm 2 by ion beam sputtering a routinely available service from IRML. The preparation of the actinide material in a form suitable for sputtering is a key to this technique, as is designing a sputtering system that allows the flexibility required for custom-ordered target production. At present, development work is being conducted on low-activity actinides in a bench-top system. The system will then be installed in a hood or glove box approved for radioactive materials handling where processing of radium, actinium, and plutonium isotopes among others will be performed.

  8. Generalized phase diagram for the rare-earth elements: Calculations and correlations of bulk properties

    International Nuclear Information System (INIS)

    Johansson, B.; Rosengren, A.

    1975-01-01

    A ''generalized'' phase diagram is constructed empirically for the lanthanides. This diagram makes it possible, not only in one picture, to assemble a lot of information but also to predict phase transitions not yet experimentally accessible. Further, it clearly illustrates the close relation between the members of the lanthanide group. To account for some of its features, the pseudopotential method is applied. The trend in crystal structure through the lanthanide series can thereby be qualitatively accounted for, as can the trend in crystal structure for an individual element, when compressed. A scaling procedure makes it possible to extend the treatment to elements neighboring the lanthanides in the Periodic Table. In total 25 elements are considered. An atomic parameter f (relatable to the pseudopotential) is introduced, by means of which different phase transitions, both for an individual rare-earth element and intra-rare-earth alloys, can be correlated to certain critical values of this parameter. A nonmagnetic rare-earth series (Sc, Lu, Y, La, and Ac) is introduced and the occurrence of superconductivity is discussed with special emphasis on the pressure dependence of the transition temperature. This temperature can be correlated to the above-mentioned parameter f, both for intra-rare-earth alloys and pure elements at different pressures. The correlation implies that actinium is a superconductor with a critical temperature which could be as high as (11--12) degree K

  9. Emanations and 'induced' radioactivity: from mystery to (mis)use

    International Nuclear Information System (INIS)

    Kolar, Z.I.

    1999-01-01

    The natural Rn isotopes were discovered within the period 1899-1902 and at that time referred to as emanations because they came out (emanated) of sources/materials containing actinium, thorium and radium, respectively. The (somewhat mysterious) emanations appeared to disintegrate into radioactive decay products which by depositing at solid surfaces gave rise to 'induced' radioactivity i.e. radioactive substances with various half-lives. Following the discovery of the emanations the volume of the research involving them and their disintegration products grew steeply. The identity of a number of these radioactive products was soon established. Radium emanation was soon used as a source of RaD ( 210 Pb) to be applied as an 'indicator' (radiotracer) for lead in a study on the solubility of lead sulphide and lead chromate. Moreover, radium and its emanation were introduced into the medical practice. Inhaling radon and drinking radon-containing water became an accepted medicinal use (or misuse?) of that gas. Shortly after the turn of the century, the healing (?) action of natural springs (spas) was attributed to their radium emanation, i.e. radon. Bathing in radioactive spring water and drinking it became very popular. Even today, bathing in radon-containing water is still a common medical treatment in Jachymov, Czech Republic. (author)

  10. Selective Decontamination Effect of Metal Ions in Soil Using Supercritical CO2 and TBP Complex

    International Nuclear Information System (INIS)

    Park, Jihye; Park, Kwangheon; Jung, Wonyoung

    2014-01-01

    Decontamination of soil pollution is difficult because the type of contamination largely depends on the characteristics of the pollutant and the area. Also, existing soil decontamination methods generate large quantities of secondary waste and additional process costs. For this reason, new decontamination methods are always under active investigation. A method involving the use of supercritical carbon dioxide with excellent permeability in place of chemical solvents is currently being studied. Unlike other heavy metals in fission products, uranium is used as fuel, and must be handled carefully. Therefore, in this paper, we studied a supercritical carbon dioxide method for decontaminating heavy metal ions in soil using tri-n-butyl phosphate(TBP), which is well known as a ligand for the extraction of metal ions of actinium. We investigated the decontamination effect of heavy metal ions in the soil using TBP-HNO 3 Complex and supercritical carbon dioxide. The study results showed that when heavy metals in soil are extracted using supercritical carbon dioxide, the extraction efficiency is different according to the type of pollutant metal ions in the soil. When TBP-HNO 3 Complex is used with an extractant, uranium extraction is very effective, but lithium, strontium, and cesium extraction is not effective. Therefore, in the case of a mixture of uranium and other metals such as lithium, strontium, cesium, and so on in soil contaminated by fission product leaks from nuclear power plants, we can selectively decontaminate uranium with supercritical carbon dioxide and TBP-HNO 3 Complex

  11. Selective Decontamination Effect of Metal Ions in Soil Using Supercritical CO{sub 2} and TBP Complex

    Energy Technology Data Exchange (ETDEWEB)

    Park, Jihye; Park, Kwangheon; Jung, Wonyoung [Kyunghee Univ., Yongin (Korea, Republic of)

    2014-10-15

    Decontamination of soil pollution is difficult because the type of contamination largely depends on the characteristics of the pollutant and the area. Also, existing soil decontamination methods generate large quantities of secondary waste and additional process costs. For this reason, new decontamination methods are always under active investigation. A method involving the use of supercritical carbon dioxide with excellent permeability in place of chemical solvents is currently being studied. Unlike other heavy metals in fission products, uranium is used as fuel, and must be handled carefully. Therefore, in this paper, we studied a supercritical carbon dioxide method for decontaminating heavy metal ions in soil using tri-n-butyl phosphate(TBP), which is well known as a ligand for the extraction of metal ions of actinium. We investigated the decontamination effect of heavy metal ions in the soil using TBP-HNO{sub 3} Complex and supercritical carbon dioxide. The study results showed that when heavy metals in soil are extracted using supercritical carbon dioxide, the extraction efficiency is different according to the type of pollutant metal ions in the soil. When TBP-HNO{sub 3} Complex is used with an extractant, uranium extraction is very effective, but lithium, strontium, and cesium extraction is not effective. Therefore, in the case of a mixture of uranium and other metals such as lithium, strontium, cesium, and so on in soil contaminated by fission product leaks from nuclear power plants, we can selectively decontaminate uranium with supercritical carbon dioxide and TBP-HNO{sub 3} Complex.

  12. Study of Soil Decontamination Method Using Supercritical Carbon Dioxide and TBP

    International Nuclear Information System (INIS)

    Park, Jihye; Park, Kwangheon; Jung, Wonyoung

    2014-01-01

    The result of this study means that we have a possible new method for cheap and less wasteful nuclear waste decontamination. When severe accidents such as the incident at the Fukushima nuclear site occur, the soil near the power plant is contaminated with fission products or the activation metal structure of the power plant. The soil pollution form depends on the environment and soil characteristics of the contaminated areas. Thus, a- single-decontamination method is not effective for site cleanup. In addition, some soil decontamination methods are expensive and large amounts of secondary waste are generated. Therefore, we need new soil decontamination methods. In this study, instead of using a conventional solvent method that generates secondary waste, supercritical carbon dioxide was used to remove metal ions from the soil. Supercritical carbon dioxide is known for good permeation characteristics. We expect that we will reduce the cost of soil pollution management. Supercritical carbon dioxide can decontaminate soil easily, as it has the ability to penetrate even narrow gaps with very good moisture permeability. We used TBP, which is a known for extractant of actinium metal. TBP is usually used for uranium and strontium extraction. Using TBP-HNO 3 complex and supercritical carbon dioxide, we did extraction experiments for several heavy metals in contaminated soil

  13. Study of Soil Decontamination Method Using Supercritical Carbon Dioxide and TBP

    Energy Technology Data Exchange (ETDEWEB)

    Park, Jihye; Park, Kwangheon; Jung, Wonyoung [Kyunghee Univ., Yongin (Korea, Republic of)

    2014-05-15

    The result of this study means that we have a possible new method for cheap and less wasteful nuclear waste decontamination. When severe accidents such as the incident at the Fukushima nuclear site occur, the soil near the power plant is contaminated with fission products or the activation metal structure of the power plant. The soil pollution form depends on the environment and soil characteristics of the contaminated areas. Thus, a- single-decontamination method is not effective for site cleanup. In addition, some soil decontamination methods are expensive and large amounts of secondary waste are generated. Therefore, we need new soil decontamination methods. In this study, instead of using a conventional solvent method that generates secondary waste, supercritical carbon dioxide was used to remove metal ions from the soil. Supercritical carbon dioxide is known for good permeation characteristics. We expect that we will reduce the cost of soil pollution management. Supercritical carbon dioxide can decontaminate soil easily, as it has the ability to penetrate even narrow gaps with very good moisture permeability. We used TBP, which is a known for extractant of actinium metal. TBP is usually used for uranium and strontium extraction. Using TBP-HNO{sub 3} complex and supercritical carbon dioxide, we did extraction experiments for several heavy metals in contaminated soil.

  14. Alpha-emitting nuclides in the marine environment

    Science.gov (United States)

    Pentreath, R. J.

    1984-06-01

    The occurrence of alpha-emitting nuclides and their daughter products in the marine environment continues to be a subject of study for many reasons. Those nuclides which occur naturally, in the uranium, thorium and actinium series, are of interest because of their value in determining the rates of geological and geochemical processes in the oceans. Studies of them address such problems as the determination of rates of transfer of particulate matter, deposition rates, bioturbation rates, and so on. Two of the natural alpha-series nuclides in which a different interest has been expressed are 210Po and 226Ra, because their concentrations in marine organisms are such that they contribute to a significant fraction of the background dose rates sustained both by the organisms themselves and by consumers of marine fish and shellfish. To this pool of naturally-occurring nuclides, human activities have added the transuranium nuclides, both from the atmospheric testing of nuclear devices and from the authorized discharges of radioactive wastes into coastal waters and the deep sea. Studies have therefore been made to understand the chemistry of these radionuclides in sea water, their association with sedimentary materials, and their accumulation by marine organisms, the last of these being of particular interest because the transuranics are essentially "novel" elements to the marine fauna and flora. The need to predict the long-term behaviour of these nuclides has, in turn, stimulated research on those naturally-occurring nuclides which may behave in a similar manner.

  15. Review of radionuclide source terms used for performance-assessment analyses

    International Nuclear Information System (INIS)

    Barnard, R.W.

    1993-06-01

    Two aspects of the radionuclide source terms used for total-system performance assessment (TSPA) analyses have been reviewed. First, a detailed radionuclide inventory (i.e., one in which the reactor type, decay, and burnup are specified) is compared with the standard source-term inventory used in prior analyses. The latter assumes a fixed ratio of pressurized-water reactor (PWR) to boiling-water reactor (BWR) spent fuel, at specific amounts of burnup and at 10-year decay. TSPA analyses have been used to compare the simplified source term with the detailed one. The TSPA-91 analyses did not show a significant difference between the source terms. Second, the radionuclides used in source terms for TSPA aqueous-transport analyses have been reviewed to select ones that are representative of the entire inventory. It is recommended that two actinide decay chains be included (the 4n+2 ''uranium'' and 4n+3 ''actinium'' decay series), since these include several radionuclides that have potentially important release and dose characteristics. In addition, several fission products are recommended for the same reason. The choice of radionuclides should be influenced by other parameter assumptions, such as the solubility and retardation of the radionuclides

  16. Geological disposal: security and R and D. Security of 'second draft for R and D of geological disposal'

    International Nuclear Information System (INIS)

    Shiotsuki, Masao; Miyahara, Kaname

    2003-01-01

    The second draft for R and D of geological disposal (second draft) was arranged in 1999. The idea of security of geological disposal in the second draft is explained. The evaluation results of the uncertainty analysis and an example of evaluation of the effect of separation nuclear transmutation on the geological disposal are shown. The construction of strong engineered barrier is a basic idea of geological disposal system. Three processes such as isolation, engineering countermeasures and safety evaluation are carried out for the security of geological disposal. The security of geological environment for a long time of 12 sites in Japan was studied by data. Provability of production and enforcement of engineered barrier were confirmed by trial of over pack, tests and the present and future technologies developed. By using the conditions of reference case in the second draft, the evaluation results of dose effects in the two cases: 1) 90 to 99% Cs and Sr removed from HLW (High Level radioactive Waste) and 2) high stripping ratio of actinium series are explained. (S.Y.)

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

    Directory of Open Access Journals (Sweden)

    Jaspreet Singh Jaggi

    2007-03-01

    Full Text Available 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.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.The data suggest that alpha-particle immunotherapy to neovasculature, alone or in combination with sequential chemotherapy, is an effective approach to cancer therapy.

  18. Soil nuclide distribution coefficients and their statistical distributions

    International Nuclear Information System (INIS)

    Sheppard, M.I.; Beals, D.I.; Thibault, D.H.; O'Connor, P.

    1984-12-01

    Environmental assessments of the disposal of nuclear fuel waste in plutonic rock formations require analysis of the migration of nuclides from the disposal vault to the biosphere. Analyses of nuclide migration via groundwater through the disposal vault, the buffer and backfill, the plutonic rock, and the consolidated and unconsolidated overburden use models requiring distribution coefficients (Ksub(d)) to describe the interaction of the nuclides with the geological and man-made materials. This report presents element-specific soil distribution coefficients and their statistical distributions, based on a detailed survey of the literature. Radioactive elements considered were actinium, americium, bismuth, calcium, carbon, cerium, cesium, iodine, lead, molybdenum, neptunium, nickel, niobium, palladium, plutonium, polonium, protactinium, radium, samarium, selenium, silver, strontium, technetium, terbium, thorium, tin, uranium and zirconium. Stable elements considered were antimony, boron, cadmium, tellurium and zinc. Where sufficient data were available, distribution coefficients and their distributions are given for sand, silt, clay and organic soils. Our values are recommended for use in assessments for the Canadian Nuclear Fuel Waste Management Program

  19. Anomalies of Nuclear Criticality, Revision 6

    International Nuclear Information System (INIS)

    Clayton, E.D.; Prichard, Andrew W.; Durst, Bonita E.; Erickson, David; Puigh, Raymond J.

    2010-01-01

    This report is revision 6 of the Anomalies of Nuclear Criticality. This report is required reading for the training of criticality professionals in many organizations both nationally and internationally. This report describes many different classes of nuclear criticality anomalies that are different than expected. An anomaly is defined as something not in keeping with expected notions of fitness and order, a departure from the regular arrangement or general rule. In reviewing the literature and experimental data on nuclear criticality and the conditions under which a fission chain reaction can be achieved, a number of anomalies have come to light. The actinide group is composed of the fourteen elements beginning with thorium, Atomic No. 90, and ending with lawrencium, Atomic No. 103. There are about 220 known actinide isotopes, most of which are believed capable of supporting neutron chain reactions. Although every element in the actinide group has at least one isotope believed capable of supporting a chain reaction, from a practical point of view regarding the time for chemical processing, only those nuclides with half-lives more than several weeks are of obvious concern in criticality safety. Forty-six of the nuclides are known to have half-lives greater than six weeks. The selection of six weeks is somewhat arbitrary. There may well be shorter-lived nuclides of concern in criticality safety. These 46 nuclides are identified in Figure 44. Of the 46 nuclides, 4 are known and 37 are believed to be capable of supporting chain reactions, and 5 are known or believed to not support a chain reaction. Figure 44 was constructed in the format used for the Chart of the Nuclides.(1) Figure 44 also shows the distinction between fissile and fissible nuclides. The actinides derive their name from actinium (Atomic No. 89) because they tend to maintain an actinium-like electron structure as the fourteen inner electrons are added to the 5f electron shell. Actually, electrons do

  20. Radiation sources and process

    International Nuclear Information System (INIS)

    Honious, H.B.; Janzow, E.F.; Malson, H.A.; Moyer, S.E.

    1980-01-01

    The invention relates to radiation sources comprising a substrate having an electrically-conductive non-radioactive metal surface, a layer of a metal radioactive isotope of the scandium group, which in addition to scandium, yttrium, lanthanum and actinium, includes all the lanthanide and actinide series of elements, with the actinide series usually being preferred because of the nature of the radioactive isotopes therein, particularly americium-241, curium-244, plutonium-238, californium-252 and promethium-147, and a non-radioactive bonding metal codeposited on the surface by electroplating the isotope and bonding metal from an electrolytic solution, the isotope being present in the layer in minor amount as compared to the bonding metal, and with or without a non-radioactive protective metal coating covering the isotoype and bonding metal on the surface, the coating being sufficiently thin to permit radiation to pass through the coating. The invention also relates to a process for providing radiation sources comprising codepositing a layer of the metal radioactive isotope with a non-radioactive bonding metal from an electrolytic solution in which the isotope is present in minor molar amount as compared to the bonding metal such that the codeposited layer contains a minor molar amount of the isotope compared to the bonding metal by electroplating on an electrically-conductive non-radioactive metal surface of a cathode substrate, and with or without depositing a nonradioactive protective metal coating over the isotope and bonding metal on the surface, the coating being sufficiently thin to permit radiation to pass through the coating

  1. The Properties of Trilaurylmethylammonium Nitrate as an Extractant for Trivalent Actinides. RCN Report

    International Nuclear Information System (INIS)

    Ooyen, J. van

    1970-03-01

    The concept of the group of the actinide elements as a f-type transition series within the periodic system was first launched by G.T. Seaborg in 1944]. In this transition series the filling up of the 5 f electron shell would cause a close similarity with the lanthanide series. This proved to be a very fruitful hypothesis in the prediction of the properties of the new elements americium and curium that soon were discovered. The new hypothesis necessitated a shift of the accepted ideas concerning the place of the elements thorium, protactinium and uranium in the periodic table. In fact, the chemistry of these elements had never been considered to be so closely parallel to that of the lanthanides. On the contrary, the trend in the stability of the oxidation states had been interpreted to indicate that these elements would belong to group IVA, VA and VIA respectively. It is undeniable that there are marked differences in oxidation states between the lanthanide elements and the first six elements of the actinide series. However, physical and chemical investigations both of the newly discovered elements and the elements actinium to uranium disclosed many resemblances with the lanthanides that had not been noticed before in this group. The actinide elements - and more in particular the transuranium elements - have been the subject of a number of monographs covering the discovery, the synthesis, the systematics, the chemistry, and (or) the nuclear properties of these elements. It is for this reason that the scope of the following sections in this chapter will be limited to a summary of the chemistry in sofar as it is relevant to the investigations described in the following chapters, viz., the properties of the elements in aqueous systems and more in particular in those systems containing nitrate ions

  2. Mitigation of radiation nephropathy after internal α-particle irradiation of kidneys

    International Nuclear Information System (INIS)

    Jaggi, Jaspreet Singh; Seshan, Surya V.; McDevitt, Michael R.; Sgouros, George; Hyjek, Elizabeth; Scheinberg, David A.

    2006-01-01

    Purpose: Internal irradiation of kidneys as a consequence of radioimmunotherapy, radiation accidents, or nuclear terrorism can result in radiation nephropathy. We attempted to modify pharmacologically, the functional and morphologic changes in mouse kidneys after injection with the actinium ( 225 Ac) nanogenerator, an in vivo generator of α- and β-particle emitting elements. Methods and Materials: The animals were injected with 0.35 μCi of the 225 Ac nanogenerator, which delivers a dose of 27.6 Gy to the kidneys. Then, they were randomized to receive captopril (angiotensin-converting enzyme inhibitor), L-158,809 (angiotensin II receptor-1 blocker), spironolactone (aldosterone receptor antagonist), or a placebo. Results: Forty weeks after the 225 Ac injection, the placebo-control mice showed a significant increase in blood urea nitrogen (BUN) (87.6 ± 6.9 mg/dL), dilated Bowman spaces, and tubulolysis with basement membrane thickening. Captopril treatment accentuated the functional (BUN 119.0 ± 4.0 mg/dL; p <0.01 vs. placebo controls) and histopathologic damage. In contrast, L-158,809 offered moderate protection (BUN 66.6 ± 3.9 mg/dL; p = 0.02 vs. placebo controls). Spironolactone treatment, however, significantly prevented the development of histopathologic and functional changes (BUN 31.2 ± 2.5 mg/dL; p <0.001 vs. placebo controls). Conclusions: Low-dose spironolactone and, to a lesser extent, angiotensin receptor-1 blockade can offer renal protection in a mouse model of internal α-particle irradiation

  3. Alpha Emitting Radionuclides and Radiopharmaceuticals for Therapy

    International Nuclear Information System (INIS)

    Chérel, Michel; Barbet, Jacques

    2013-01-01

    Today, cancer treatments mainly rely on surgery or external beam radiation to remove or destroy bulky tumors. Chemotherapy is given when tumours cannot be removed or when dissemination is suspected. However, these approaches cannot permanently treat all cancers and relapse occurs in up to 50% of the patients’ population. Radioimmunotherapy (RIT) and peptide receptor radionuclide therapy (PRRT) are effective against some disseminated and metastatic diseases, although they are rarely curative. Most preclinical and clinical developments in this field have involved electron-emitting radionuclides, particularly iodine-131, yttrium-90 and lutetium-177. The large range of the electrons emitted by these radionuclides reduces their efficacy against very small tumour cell clusters or isolated tumour cells present in residual disease and in many haematological tumours (leukaemia, myeloma). The range of alpha particles in biological tissues is very short, less than 0.1 mm, which makes alpha emitters theoretically ideal for treatment of such isolated tumour cells or micro-clusters of malignant cells. Thus, over the last decade, a growing interest for the use of alpha-emitting radionuclides has emerged. Research on targeted alpha therapy (TAT) began years ago in Nantes through cooperation between Subatech, a nuclear physics laboratory, CRCNA, a cancer research centre with a nuclear oncology team and ITU (Karlsruhe, Germany). CD138 was demonstrated as a potential target antigen for Multiple Myeloma, which is a target of huge clinical interest particularly suited for TAT because of the disseminated nature of the disease consisting primarily of isolated cells and small clusters of tumour cells mainly localized in the bone marrow. Thus anti-CD138 antibodies were labelled with bismuth-213 from actinium-225/bismuth-213 generators provided by ITU and used to target multiple myeloma cells. In vitro studies showed cell cycle arrest, synergism with chemotherapy and very little induction

  4. Determination of radium in water

    Energy Technology Data Exchange (ETDEWEB)

    Hohorst, F.A.; Huntley, M.W.; Hartenstein, S.D.

    1995-10-01

    These detailed work instructions (DWIs) are tailored for the analysis of radium-226 and radium-228 in drinking water supplies from ground water and surface water sources and composites derived from them. The instructions have been adapted from several sources, including a draft EPA method. One objective was to minimize the generation of mixed wastes. Quantitative determinations of actinium-228 are made at 911 keV. The minimum detection level (MDL) for the gamma spectrometric measurements at this energy vary with matrix, volume, geometry, detector, background, and counting statistics. The range of MDL`s for current detectors is 0.07 to 0.5 Bq/sample. Quantitative determinations of radium-226 are made by counting the high energy alpha particles which radium-226 progeny emit using liquid scintillation counting (LSC). The minimum detectable activity (MDA) is 3.8 E-3 Bq/sample. The maximum concentration which may be counted on available instruments without dilution is about 2 E + 5 Bq/sample. Typically, this determination of radium in a 2 L sample has a yield of 80%. If radium-228 is determined using a 16 h count after 50 h grow-in, the typical MDL is 1 E-9 to 8 E-9 {mu}Ci/mL (1 to 8 pCi/L). If radium-226 is determined using a 2.5 h count after 150 h grow-in, the typical MDA is about 1 E-10 {mu}Ci/mL (0. 1 pCi/L).

  5. Determination of radium in water

    International Nuclear Information System (INIS)

    Hohorst, F.A.; Huntley, M.W.; Hartenstein, S.D.

    1995-10-01

    These detailed work instructions (DWIs) are tailored for the analysis of radium-226 and radium-228 in drinking water supplies from ground water and surface water sources and composites derived from them. The instructions have been adapted from several sources, including a draft EPA method. One objective was to minimize the generation of mixed wastes. Quantitative determinations of actinium-228 are made at 911 keV. The minimum detection level (MDL) for the gamma spectrometric measurements at this energy vary with matrix, volume, geometry, detector, background, and counting statistics. The range of MDL's for current detectors is 0.07 to 0.5 Bq/sample. Quantitative determinations of radium-226 are made by counting the high energy alpha particles which radium-226 progeny emit using liquid scintillation counting (LSC). The minimum detectable activity (MDA) is 3.8 E-3 Bq/sample. The maximum concentration which may be counted on available instruments without dilution is about 2 E + 5 Bq/sample. Typically, this determination of radium in a 2 L sample has a yield of 80%. If radium-228 is determined using a 16 h count after 50 h grow-in, the typical MDL is 1 E-9 to 8 E-9 μCi/mL (1 to 8 pCi/L). If radium-226 is determined using a 2.5 h count after 150 h grow-in, the typical MDA is about 1 E-10 μCi/mL (0. 1 pCi/L)

  6. The effects of actinide separation on the radiological consequences of disposal of high-level radioactive waste on the ocean bed

    International Nuclear Information System (INIS)

    Camplin, W.C.; Grimwood, P.D.; White, I.F.

    1980-01-01

    One option in the management of high-level radioactive wastes is to separate the actinides prior to vitrification and disposal. This option is examined in the context of disposal of high-level wastes on the deep ocean bed. The initial quantity of waste corresponds to the generation of 1000 GW(e)y of nuclear energy, and the actinide-separation process is assumed to remove 99% of all elements of atomic number greater than that of actinium. The models used to describe the dispersion of activity from a single disposal site on the bed of the Atlantic Ocean represent both local dispersion and long-term mixing. Collective doses and doses to individuals are calculated for six potential pathways: ingestion of fish, crustacea, molluscs, plankton and seaweed, and external irradiation from contaminated beach sediments. The period from 400 to 1,000,000 years after disposal is considered. The potential radiological impact from disposal of high-level waste without separation of actinides on the ocean bed arises from the actinides; isotopes of americium, neptunium and plutonium give the highest doses. Actinide separation would reduce these doses in proportion to the effectiveness of the separation process, until doses become determined by fission products rather than actinides: the achievable dose reduction would be a factor of approximately a hundred, or less for certain pathways. This reduction applies only to doses to the public from waste disposal: no account was taken of doses arising from the separation process itself or from the management of the separated actinides. The results of the assessment are contrasted with those of similar studies based on toxicity indices. Major deficiencies are identified in the use of toxicity indices as a basis for decision-making. (author)

  7. An aerial radiological survey of the Nevada Test Site

    International Nuclear Information System (INIS)

    Hendricks, T.J.; Riedhauser, S.R.

    1999-01-01

    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

  8. Complexes of groups 3,4, the lanthanides and the actinides containing neutral phophorus donor ligands

    International Nuclear Information System (INIS)

    Fryzuk, M.D.; Haddad, T.S.; Berg, D.J.

    1990-01-01

    Of relevance to this review are complexes of the early transition elements, in particular groups 3 and 4 and the lanthanides and actinides. In this review the authors have attempted to collect all the data up to the end of 1988 for complexed of groups 3 and 4, the lanthanides and the actinides that contain phosphorus donor ligands. The 1989s have seen a renaissance of the use of phosphine donors for the early d elements (groups 3 and 4) and the f elements. Neutral phosphorus donors are defined as primary (PH 2 R), secondary (PH 2 ) or tertiary phosphines (PR 3 ), including complexes of phosphine, PH 3 . Also reviewed are complexes of PF 3 and phosphites, P(OR) 3 . Specifically excluded are phosphido derivates, PR 2 . The ability of a neutral phosphorus donor to bind the metals of groups 3 and 4, the lanthanides and the actinides is now well established. While there are still no examples of lanthanum or actinium phosphine complexes, such derivatives should be accessible at least for lanthanum. series. However, there is no obvious chemical reason to suggest that such derivatives cannot be generated. The phosphine ligands that appear to generate the most stable phosphine-metal interaction are chelating phosphines such as dmpe, trmpe and trimpsi. In addition, the use of the chelate effect in conjunction with a hard ligand such as the amide in - N(SiMe 2 CH 2 PMe 2 ) 2 , or an alkoxide as found in - OC(BU t ) 2 CH 2 PMe 2 , also appears to be effective in anchoring the phosphine donor to the metal. The majority of low oxidation state derivatives of the group 4 elements are stabilized by phosphine donors in contrast with other parts of the transition series where one finds that classic π-acceptor-type ligands such as CO or RNC are utilized. 233 refs

  9. Radiological survey of the Mallinckrodt Chemical Works, St. Louis, Missouri

    International Nuclear Information System (INIS)

    Goldsmith, W.A.; Leggett, R.W.; Haywood, F.F.

    1981-12-01

    The results of a radiological survey of part of the Mallinckrodt Chemical Works (former Destrehan and Broadway Street plants), St. Louis, Missouri, are presented. During the period 1942 through 1957, this site was used for various projects involving the production of purified uranium from pitchblende concentrates. The survey included measurements of the following: residual alpha and beta-gamma contamination levels in the existing buildings that were used in the uranium projects; external gamma radiation levels at 1 m above the surface in these buildings and outdoors around these buildings; radon and radon daughter concentrations in the air in these buildings; uranium, radium, actinium, and thorium concentrations in surface and subsurface soil on the site; concentrations of radionuclides in water and sediment found in drains both inside and outside the buildings; and concentrations of radionuclides in ground and surface water on the site and in river water taken near the site. Alpha and beta-gamma contamination levels inside and outside some of the buildings were above limits set by current federal guidelines concerning the release of property for unrestricted use. Elevated external gamma radiation levels were measured at some outdoor locations and in some of the buildings. Licensable concentrations of uranium were found in soil at some places, and the concentration of uranium in a water sample taken from a core hole between Buildings 100 and 101 was in excess of limits set by current federal standards. Radon and radon daughter concentrations in three buildings were in excess of current federal guidelines for nonoccupational radiation exposure

  10. Radiological survey of the Mallinckrodt Chemical Works, St. Louis, Missouri

    Energy Technology Data Exchange (ETDEWEB)

    Goldsmith, W A; Leggett, R W; Haywood, F F

    1981-12-01

    The results of a radiological survey of part of the Mallinckrodt Chemical Works (former Destrehan and Broadway Street plants), St. Louis, Missouri, are presented. During the period 1942 through 1957, this site was used for various projects involving the production of purified uranium from pitchblende concentrates. The survey included measurements of the following: residual alpha and beta-gamma contamination levels in the existing buildings that were used in the uranium projects; external gamma radiation levels at 1 m above the surface in these buildings and outdoors around these buildings; radon and radon daughter concentrations in the air in these buildings; uranium, radium, actinium, and thorium concentrations in surface and subsurface soil on the site; concentrations of radionuclides in water and sediment found in drains both inside and outside the buildings; and concentrations of radionuclides in ground and surface water on the site and in river water taken near the site. Alpha and beta-gamma contamination levels inside and outside some of the buildings were above limits set by current federal guidelines concerning the release of property for unrestricted use. Elevated external gamma radiation levels were measured at some outdoor locations and in some of the buildings. Licensable concentrations of uranium were found in soil at some places, and the concentration of uranium in a water sample taken from a core hole between Buildings 100 and 101 was in excess of limits set by current federal standards. Radon and radon daughter concentrations in three buildings were in excess of current federal guidelines for nonoccupational radiation exposure.

  11. Radiological analysis of environmental samples in some points of the coast of the Gulf of Mexico and Coast of Quintana Roo, Mexico

    International Nuclear Information System (INIS)

    Salas Mar, Bernardo; Martinez Negrete, Marco Antonio; Ruiz Chavarria, Gerardo; Abarca Munguia, Jose

    2008-01-01

    Full text: We describe in this paper the results obtained by the project 'Radiological analysis of environmental samples in some points of the coast of the Gulf of Mexico and coast of Quintana Roo, Mexico'. The purpose of the study is to identify and quantify the natural and anthropogenic radionuclides present from sediments, sand and seawater from several sites located along the coast of the Gulf of Mexico and the Caribean Sea. The samples are analysed in a Canberra Multichannel analyzer system for gamma spectrometry, equipped with a detector of hyper pure germanium and a Genie 2000 software, in the 'Laboratory of Radiological Analysis of Environmental Samples', belonging to the Physics Department, Faculty of Sciences, National Autonomous University of Mexico (UNAM). The geographic sites were samples were taken include the states of Tamaulipas, Veracruz, Tabasco, Campeche, Yucatan and Quintana Roo. The results of this studies will be published at the end of the project and we hope they will be useful for the national health and industrial sectors. Until now we have identified and measured the presence of natural radionuclides such as Potassium-40 (K-40), Bismuth 212 (Bi-212), Lead-212 (Pb-212), Bismuth-214 (Bi-214), Lead-214 (Pb-214), Radium-226 (Ra-226), Actinium 228 (Ac-228), Uranium-235 (U-235), as well as some anthropogenic radionuclides found near the Laguna Verde Nuclear Power Plant. The project is scheduled to last for three years, finishing in 2009. At its ending we shall be able to present conclusions and identify some tendencies, in connection with the background and possible radioactive contamination of the studied zones. This project takes place under the auspice of the 'Program of Support to Projects of Research and Technological Innovation' of the National Autonomous University of Mexico. (author)

  12. Determination of radionuclides in discharged water from gold ...

    African Journals Online (AJOL)

    Long-lived radionuclides from the Uranium-, Thorium- and Actinium-decay chains in the discharged water into the environment were radiochemically separated and the activity concentrations determined for 238U-series ranged from 3.8 ± 1.5 to 178 ± 19 mBqL-1, 232Th-series ranged from < 2.0 to 47.8 ± 7.3 mBqL-1 and ...

  13. Optimizing labelling conditions of 213Bi-DOTATATE for preclinical applications of peptide receptor targeted alpha therapy.

    Science.gov (United States)

    Chan, Ho Sze; de Blois, Erik; Konijnenberg, Mark W; Morgenstern, Alfred; Bruchertseifer, Frank; Norenberg, Jeffrey P; Verzijlbergen, Fred J; de Jong, Marion; Breeman, Wouter A P

    2017-01-01

    213 Bismuth ( 213 Bi, T 1/2 = 45.6 min) is one of the most frequently used α-emitters in cancer research. High specific activity radioligands are required for peptide receptor radionuclide therapy. The use of generators containing less than 222 MBq 225 Ac (actinium), due to limited availability and the high cost to produce large-scale 225 Ac/ 213 Bi generators, might complicate in vitro and in vivo applications though.Here we present optimized labelling conditions of a DOTA-peptide with an 225 Ac/ 213 Bi generator (< 222 MBq) for preclinical applications using DOTA-Tyr 3 -octreotate (DOTATATE), a somatostatin analogue. The following labelling conditions of DOTATATE with 213 Bi were investigated; peptide mass was varied from 1.7 to 7.0 nmol, concentration of TRIS buffer from 0.15 mol.L -1 to 0.34 mol.L -1 , and ascorbic acid from 0 to 71 mmol.L -1 in 800 μL. All reactions were performed at 95 °C for 5 min. After incubation, DTPA (50 nmol) was added to stop the labelling reaction. Besides optimizing the labelling conditions, incorporation yield was determined by ITLC-SG and radiochemical purity (RCP) was monitored by RP-HPLC up to 120 min after labelling. Dosimetry studies in the reaction vial were performed using Monte Carlo and in vitro clonogenic assay was performed with a rat pancreatic tumour cell line, CA20948. At least 3.5 nmol DOTATATE was required to obtain incorporation ≥ 99 % with 100 MBq 213 Bi (at optimized pH conditions, pH 8.3 with 0.15 mol.L -1 TRIS) in a reaction volume of 800 μL. The cumulative absorbed dose in the reaction vial was 230 Gy/100 MBq in 30 min. A minimal final concentration of 0.9 mmol.L -1 ascorbic acid was required for ~100 MBq (t = 0) to minimize radiation damage of DOTATATE. The osmolarity was decreased to 0.45 Osmol/L.Under optimized labelling conditions, 213 Bi-DOTATATE remained stable up to 2 h after labelling, RCP was ≥ 85 %. In vitro showed a negative correlation between ascorbic acid

  14. The contribution of radioisotopes in secular equilibrium in the transport index of fissile uranium compounds in different enrichments

    International Nuclear Information System (INIS)

    Silva, Teresinha de Moraes da; Sordi, Gian M.A.A.

    2008-01-01

    Full text: This work shows the contribution of radioisotopes in secular equilibrium in the transport index (TI) of some fissile uranium compounds: uranium oxides UO 2 , U 3 O 8 and uranium silicide U 3 Si 2 , taking into account the different enrichment grades.The range of enrichment (E%) studied was 3,4,5,7,10,20,30,40,50,93 and 100. Initially, the cell of optimum moderation ratio was built, since it represents the most reactive of the system (consisting of uranium), with maximum infinitive multiplication factor k∞, in certain concentration of uranium for each enrichment. This was made using the computer program Gamtec II. The critical radius of a sphere was calculated for a cell of optimum moderation ratio, in order to calculate the critical mass of the uranium compound or of the uranium element for each specific enrichment. For this the program Citation was used. In this study it was calculated the smallest critical mass of the uranium compound or the smallest critical mass of the uranium element. The objective was to match the largest mass of the uranium with each specific enrichment. The largest safety mass corresponds to 45% the critical mass the compound uranium or uranium element. Then, we calculated the uranium element safety mass, which it related to a fifth of this mass to the value 50, which corresponds to criticality safety index (CSI). That is, 20% of the safety mass is the value where the transport is carried out with subcritical mass, going in favor of the security. From the uranium element safety mass (USM) was determined for each enrichment , and it was calculated the mass of 235 U, activity 235 U and dose rate of 235 U, the same items were calculated for the isotope 238 U. The total dose rate was calculated for two isotopes, and applying the transport index definition as the gamma dose rate for the distance of 1 m from the packed, it was determined the TI for 20% of the safety mass for each enrichment of the compound studied. The study of

  15. Termination of Safeguards on ULWBR Material

    International Nuclear Information System (INIS)

    Ivan R. Thomas; Ernest L. Laible

    2008-01-01

    The Department of Energy (DOE), Office of Environmental Management, has approved the disposition of 31 metric tons of Unirradiated Light Water Breeder Reactor (ULWBR) material in canisters stored within dry wells of the Underground Fuel Storage Facility at the Idaho Nuclear Technology and Engineering Center (INTEC). This unirradiated material consists primarily of ceramic pellets of thorium oxide in stainless steel cladding, but it also contains 300 kilograms of uranium that is 98 wt% U-233. The ULWBR material was not processed at the INTEC because it was incompatible with prior chemical separation schemes. Other economical recovery options have not been identified, and expressions of interest for consolidating the material with existing projects at other DOE sites have not been received. The U-233 could be used for producing the medical isotope Actinium-225, but the proof-of-principle demonstration and follow-on pilot program have not been developed to the point of requiring production quantities of U-233. Consequently, the selected disposition of the ULWBR material was burial as Low Level Waste at the Nevada Test Site (NTS), which required terminating safeguards controls for the contained Category II quantity of Attractiveness Level D special nuclear material (SNM). The requested termination followed the twelve point evaluation criteria of the Historical Defense Program Discard Guidance and included a security analysis for evaluating the risks of theft, diversion, and radiological sabotage associated with the material. Continuity of knowledge in the book inventory was assured by documenting that the original shipper's measurements accurately reflected the quantities of materials received and that the ULWBR materials had remained under adequate physical protection and had been subject to periodic physical inventories. The method selected for substantiating the book values as the basis for terminating safeguards was the nondestructive assay used during physical

  16. Radiation Doses to Members of the U.S. Population from Ubiquitous Radionuclides in the Body: Part 3, Results, Variability, and Uncertainty

    International Nuclear Information System (INIS)

    Watson, David J.; Strom, Daniel J.

    2011-01-01

    This paper is part three of a three-part series investigating annual effective doses to residents of the United States from intakes of ubiquitous radionuclides, including radionuclides occurring naturally, radionuclides whose concentrations are technologically enhanced, and anthropogenic radionuclides. The 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. 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. Part one reviewed, summarized, characterized, and grouped all published and some unpublished data for U.S. residents on ubiquitous radionuclide concentrations in tissues and organs. Part two described the methods used to organize the data collected in part one and segregate it into the ages and genders defined by the study, imputed missing values from the existing data, apportioned activity in bone, and imputed activity in hollow organ contents and the remainder of the body. This paper estimates equivalent doses to target tissues from source regions and maps target tissues to lists of tissues with International Commission on Radiation Protection (ICRP) tissue-weighting factors or to surrogate tissue regions when there is no direct match. Effective doses, using ICRP tissue-weighting factors recommended in 1977, 1990, and 2007, are then calculated, and an upper bound of variability of the effective dose is estimated by calculating the average coefficients of variation (CV), assuming all variance is due to variability. Most of the data were for adult males, whose average annual effective dose is estimated to be 337 (micro)Sv y -1 (CV = 0.65, geometric mean

  17. DISSOLVED CONCENTRATION LIMITS OF RADIOACTIVE ELEMENTS

    International Nuclear Information System (INIS)

    P. Bernot

    2005-01-01

    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 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 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 otherwise

  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. Radiometric determination of {sup 226}, {sup 228}Ac and {sup 40}K in fly ashes and building materials

    Energy Technology Data Exchange (ETDEWEB)

    Harangozo, M; Toelgyessy, J; Lesny, J; Cik, G [Slovak Technical Univ., Bratislava (Slovakia). Fac. of Chemical Technology, Dept. of Environmental Science

    1996-12-31

    In this paper the activities of radium-226, actinium-228 and potassium-40 in fly ashes and building materials of Slovakia were determined. Different origin of coals combusted results in significant differences in specific activities of radium-226 and activities-228 of measured fly-ashes and building materials. The knowledge of the specific activity of selected nuclides contained in fly-ashes is, therefore, very important and in specific cases can indicate the possibilities of their further technological use. (J.K.) 1 tab., 3 refs.

  20. Calculation of entropy of liquid metals using acoustic measurements in the framework of the rigid sphere model

    International Nuclear Information System (INIS)

    Tekuchev, V.V.; Barashkov, B.I.; Rygalov, L.N.; Dolzhikov, Yu.S.

    2001-01-01

    For the first time one obtained the polytherms of ultrasound velocity for liquid high-melting metals within wide temperature range. In terms of the rigid sphere model on the basis of the acoustic data one calculated the entropy values for 34 liquid metals at the melting point. The average discrepancy of the calculated values of entropy with the published one constitutes 8.2%. With increase of metal valency the error increases from 2.8 up to 13%. In case of francium, radium, promethium, actinium, hafnium, polonium, rhenium one obtained data for the first time [ru

  1. The discovery of plutonium reorganized the periodic table and aided the discovery of new elements

    International Nuclear Information System (INIS)

    Clark, David L.

    2009-01-01

    The modern Periodic Table derives principally from the work of the great Russian scientist Dimitri Mendeleev, who in 1869 enunciated a 'periodic law' that the properties of the elements are a periodic function of their atomic weights, and arranged the 65 known elements in a 'periodic table'. Fundamentally, every column in the main body of the Periodic Table is a grouping of elements that display similar chemical and physical behavior. Similar properties are therefore exhibited by elements with widely different mass. Chemical periodicity is central to the study of chemistry, and no other generalization comes close to its ability to systematize and rationalize known chemical facts. With the development of atomic theory, and an understanding of the electronic structure of atoms, chemical periodicity and the periodic table now find their natural explanation in the electronic structure of atoms. Moving from left to right along any row, the elements are arranged sequentially according to nuclear charge (the atomic number). Electrons counter balance that nuclear charge, hence each successive element has one more electron in its configuration. The electron configuration, or distribution of electrons among atomic orbitals, may be determined by application of the Pauli principle (paired spin in the same orbital) and the aufbau principle (which outlines the order of filling of electrons into shells of orbitals - s, p, d, f, etc.) such that in a given atom, no two electrons may have all four quantum numbers identical. In 1939, only three elements were known to be heavier than actinium: thorium, protactinium, and uranium. All three exhibited variable oxidation states and a complex chemistry. Thorium, protactinium and uranium were assumed to be d-transition metals and were placed in the Periodic Table under hafnium, tantalum, and tungsten, respectively. By 1940, McMillan and Abelson bombarded uranium atoms with slow neutrons and successfully identified atoms of element 93, which

  2. Therapy with high LET Radioisotopes: Can sufficient levels of attractive Auger and alpha emitters be produced to make their use practical?

    International Nuclear Information System (INIS)

    Knapp, F.F. Jr.; Mirzadeh, S.; Stabin, M.; Brill, A.B.

    2005-01-01

    Because of localized energy deposition within a very small volume, cellular targeted therapy with high linear energy transfer (LET) Auger-electron and alpha-particle emitting radioisotopes is of great interest. While the energy deposition from alpha particles usually encompasses several cell diameters, the dose from Auger electrons is confined to a single cell. Two major challenges for broader use of Alpha and Auger emitters are the efficient and cost effective routine production of sufficient levels of these radioisotopes, and the availability of targeting molecules to which the radioisotopes can be attached for cellular delivery of sufficient levels of activity for effective therapy. Examples of several Alpha-and Auger-emitting radioisotopes of current interest are presented. Alpha- and Auger electron-emitting radioisotopes can be produced in accelerators (A) and nuclear reactors (R), and several alpha emitter congeners (i.e. thorium-229) can be obtained from uranium decay products. The challenge for reactor production, is the availability and exploitation of methods - other then the usual radiative (n,γ) production route which will provide no-carrier-added (nca) or the high specific activity radioisotopes of interest. The submitted manuscript has been authored by a contractor of the U.S. Government under contract DE-AC05-00OR22725. Accordingly, the U.S. Government retains a nonexclusive, royalty-free license to publish or reproduce the published form of this contribution, or allow others to do so, for U.S. Government purposes High LET radioisotopes of current interest which are in the initial stages of development and/or which demonstrate practical use in clinical trials include several alpha-emitters, in particular bismuth-213 - and also the actinium-225 parent - astatine-211 and bismuth-212. Extensive experimental studies have been reported with Auger iododeoxyuridine (IdUR) radiolabeled with the iodine-125 emitter-labeled. However, development of production

  3. Applications of High Intensity Proton Accelerators

    Science.gov (United States)

    Raja, Rajendran; Mishra, Shekhar

    2010-06-01

    collider and neutrino factory - summary of working group 2 / J. Galambos, R. Garoby and S. Geer -- Prospects for a very high power CW SRF linac / R. A. Rimmer -- Indian accelerator program for ADS applications / V. C. Sahni and P. Singh -- Ion accelerator activities at VECC (particularly, operating at low temperature) / R. K. Bhandari -- Chinese efforts in high intensity proton accelerators / S. Fu, J. Wang and S. Fang -- ADSR activity in the UK / R. J. Barlow -- ADS development in Japan / K. Kikuchi -- Project-X, SRF, and very large power stations / C. M. Ankenbrandt, R. P. Johnson and M. Popovic -- Power production and ADS / R. Raja -- Experimental neutron source facility based on accelerator driven system / Y. Gohar -- Transmutation mission / W. S. Yang -- Safety performance and issues / J. E. Cahalan -- Spallation target design for accelerator-driven systems / Y. Gohar -- Design considerations for accelerator transmutation of waste system / W. S. Yang -- Japan ADS program / T. Sasa -- Overview of members states' and IAEA activities in the field of Accelerator Driven Systems (ADS) / A. Stanculescu -- Linac for ADS applications - accelerator technologies / R. W. Garnett and R. L. Sheffield -- SRF linacs and accelerator driven sub-critical systems - summary working groups 3 & 4 / J. Delayen -- Production of Actinium-225 via high energy proton induced spallation of Thorium-232 / J. Harvey ... [et al.] -- Search for the electric dipole moment of Radium-225 / R. J. Holt, Z.-T. Lu and R. Mueller -- SRF linac and material science and medicine - summary of working group 5 / J. Nolen, E. Pitcher and H. Kirk.

  4. Production of rare earth polishing powders in Russia

    International Nuclear Information System (INIS)

    Kosynkin, V.D.; Ivanov, E.N.; Kotrekhov, V.A.; Shtutza, M.G.; Grabko, A.I.

    1998-01-01

    in a suspension; polishing powder Ftoropol with addition of fluorine and higher contents of cerium dioxide (at least 70% by mass) that has a higher polishing ability and is attrition-proof, used for high-speed treatment of optical lenses, mirrors, TV screens and eyeglasses. The rare earth polishing powders made in Russia possess the following physico-chemical properties and performance characteristics; cerium dioxide content in solid REE solution - 50-90% by mass; F-ion content (in Ftoropol powder) - 8-14% by mass; non-REE content of sodium, calcium, strontium and iron impurities - at most 0.1% by mass of each element; natural radionuclide content of thorium, uranium, actinium, potassium-40 series, total standard specific activity - 0.45-0.85 Bq/g; - average particle size, 2.0-3.5 μm; density - 6.3-6.8 g/cm 3 ; pH of aqueous extract, 6-7; sedimentary stability - 10-20 minutes; polishing ability - 45-60 mg per 31 minutes (for polishing resin); abrasive inclusions - none. The report gives analysis of the. Russian powders compared against the best world analogues such as Cerox (Rhone Poulenc Company, France), Regipol (London and Scandinavian Division Chemical Company, England), etc. The analysis results imply, that the chief characteristics (granulometric composition, polishing ability and service life) of the Russian samples do not yield to the best foreign analogues, and in some properties (radionuclide content, sedimentary stability and scratching inclusions quantity) even surpass them

  5. Application of lanthanide ions doped in different glasses

    International Nuclear Information System (INIS)

    Dhondiyal, Charu Chandra

    2015-01-01

    The transfer of optical excitation energy from one ion/molecule to another ion/molecule has proved to be of potential importance in industrial application as well as research. Rare earth elements (RE) although not as rare as some of them occur more prevalently then other well known material (e.g. silver, tin, tungsten) are special group of elements of the periodic table comprising lanthanide series (from lanthanum to lutetium) and actinide series (from actinium to lawrencium). Most of the actinides are highly radioactive hence their uses are limited. Fluorescence is the particular optical property of lanthanide (RE) ions. The narrow absorption and emission lines exhibited by the RE ions in crystals, glasses and solutions have always made these ions attractive as sensitive probes of solids and liquid state and also makes them useful in laser technology, CRT displays, UV to visible converters and optical communications etc. In recent years there has been a special interest to study the properties and applications of rare earth doped in glasses. Lanthanide ions in glasses play an important role, especially by retaining their emission capabilities, in the host matrix. Glass as a dielectric material plays an important role in science and industry. Its chemical, physical and particular optical properties make it suitable for applications such as opto-electronic materials, laboratory equipment, laser gain media, etc. Photoluminescence from rare earth doped glasses are of major interest in the research area of optoelectronic device applications like phosphors, display monitors, lasers and amplifiers for communication systems. Now a days, development of optical devices based on rare-earth ions doped materials is one of the interesting fields of research. Rare earth doped glasses are widely used as laser materials, optical amplifiers, optical memory devices, magneto-optical devices, medical lasers, eye safe lasers, flat panel displays, fluorescent lamps, white LED's etc

  6. Biological pathways of exposure and ecotoxicity values for uranium and associated radionuclides: Chapter D in Hydrological, geological, and biological site characterization of breccia pipe uranium deposits in Northern Arizona

    Science.gov (United States)

    Hinck, Jo E.; Linder, Greg L.; Finger, Susan E.; Little, Edward E.; Tillitt, Donald E.; Kuhne, Wendy

    2010-01-01

    This chapter compiles available chemical and radiation toxicity information for plants and animals from the scientific literature on naturally occurring uranium and associated radionuclides. Specifically, chemical and radiation hazards associated with radionuclides in the uranium decay series including uranium, thallium, thorium, bismuth, radium, radon, protactinium, polonium, actinium, and francium were the focus of the literature compilation. In addition, exposure pathways and a food web specific to the segregation areas were developed. Major biological exposure pathways considered were ingestion, inhalation, absorption, and bioaccumulation, and biota categories included microbes, invertebrates, plants, fishes, amphibians, reptiles, birds, and mammals. These data were developed for incorporation into a risk assessment to be conducted as part of an environmental impact statement for the Bureau of Land Management, which would identify representative plants and animals and their relative sensitivities to exposure of uranium and associated radionuclides. This chapter provides pertinent information to aid in the development of such an ecological risk assessment but does not estimate or derive guidance thresholds for radionuclides associated with uranium. Previous studies have not attempted to quantify the risks to biota caused directly by the chemical or radiation releases at uranium mining sites, although some information is available for uranium mill tailings and uranium mine closure activities. Research into the biological impacts of uranium exposure is strongly biased towards human health and exposure related to enriched or depleted uranium associated with the nuclear energy industry rather than naturally occurring uranium associated with uranium mining. Nevertheless, studies have reported that uranium and other radionuclides can affect the survival, growth, and reproduction of plants and animals. Exposure to chemical and radiation hazards is influenced by a

  7. Calculation technique of free and impurity ion electronic structures

    International Nuclear Information System (INIS)

    Kulagin, N.A.; Sviridov, D.T.

    1986-01-01

    The monograph deals with calculation technique of free and impurity ion spectra with completed nl N -shell. The principles of the theory of irreducible tensor operators, genealogical coefficients, calculation technique of angular and radial parts of matrix elements operators are stated. The correlation accounting methods in free ions are considered in detail. The principles of the theory of crystal field and ligand field, the method of self-consistent field for impurity ions are reported. The technique efficiency based on example of lanthanum and actinium group ions is shown. Experimental data by nf N -ion spectra are given. The tables of angular coefficients, energy values of X-ray lines of rare earth ions and genealogical coefficients are given in the appendix

  8. Formerly utilized MED/AEC sites Remedial Action Program. Radiological survey of the St. Louis Airport Storage Site, St. Louis, Missouri. Final report. [U, Ra-bearing wastes stored in 1940-60's

    Energy Technology Data Exchange (ETDEWEB)

    None

    1979-09-01

    Results of two radiological surveys of the St. Louis-Lambert Airport property, formerly known as the Airport Storage Site, St. Louis, Missouri, are presented. Uranium- and radium-bearing waste materials were stored from the 1940's to the late 1960's in this area. The surveys included direct measurements of beta-gamma radiation; determination of uranium, actinium, and radium concentrations in soil samples and from bore holes; determination of radionuclide concentrations in groundwater and surface water; measurement of radon flux from the ground surface; and measurements of /sup 222/Rn in air near the site. Results indicate that some offsite drainage pathways are becoming contaminated, probably by runoff from the site; no migration of /sup 222/Rn from the site was observed.

  9. JAEA thermodynamic database for performance assessment of geological disposal of high-level and TRU wastes. Refinement of thermodynamic data for trivalent actinoids and samarium

    International Nuclear Information System (INIS)

    Kitamura, Akira; Fujiwara, Kenso; Yui, Mikazu

    2010-01-01

    Within the scope of the JAEA thermodynamic database project for performance assessment of geological disposal of high-level radioactive and TRU wastes, the refinement of the thermodynamic data for the inorganic compounds and complexes of trivalent actinoids (actinium(III), plutonium(III), americium(III) and curium(III)) and samarium(III) was carried out. Refinement of thermodynamic data for these elements was based on the thermodynamic database for americium published by the Nuclear Energy Agency in the Organisation for Economic Co-operation and Development (OECD/NEA). Based on the similarity of chemical properties among trivalent actinoids and samarium, complementary thermodynamic data for their species expected under the geological disposal conditions were selected to complete the thermodynamic data set for the performance assessment of geological disposal of radioactive wastes. (author)

  10. Preface

    International Nuclear Information System (INIS)

    Siwek-Wilczynska, K.

    2006-01-01

    of the lifetimes in 128 Cs, the dE/dx values for the Cs recoils moving in the target material (Sn) were measured. A substantial difference between the electronic stopping power obtained in our experiment and that in Ziegler's predictions was found. Some new data on the half-life of the isomeric states in neutron reach nuclei( 97 Sr, 97 Y and 131 Sb) are presented. Neutron reach nuclei were produced by thermal-neutron induced fission of the actinium elements at the high-flux reactor at the ILL (Grenoble). Among contributions concerning experimental methods and instrumentation, I would like to mention the report on a new radiobiological facility operating at the Heavy Ion Laboratory in Warsaw. The facility allows to vary the energy from 2 MeV/nucleon to 10 MeV/nucleon. As already mentioned, most of the work presented in this Annual Report results from close collaboration with our colleagues from many foreign as well as Polish institutes and universities. In this place, I would like to express our deep gratitude to all our friends and collaborators around the world. I would also like to acknowledge the financial support of the Ministry of Education and Science (MEiN). (author)

  11. Hypervitaminosis A

    Science.gov (United States)

    ... much vitamin A, or you have symptoms of excess vitamin A. Prevention How much vitamin A you need ... Saunders; 2015:chap 218. Ross AC, Tan L. Vitamin A deficiencies and excess. In: Kliegman RM, Stanton BF, St. Geme JW, ...

  12. 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.

  13. 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.

  14. 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.

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

    International Nuclear Information System (INIS)

    Kulagin, N.A.

    2011-01-01

    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 +4 ions in oxides, Cu +2 in HTSC, Nd +2 in solids has been discussed. Analysis of experimental data for plasma created ordered structures of crystallites with size of about 10 -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 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 -6 -10 -9 m.

  16. Background radiation and individual dosimetry in the coastal area of Tamil Nadu (India)

    International Nuclear Information System (INIS)

    Matsuda, N.; Brahmanandhan, G. M.; Yoshida, M.; Takamura, N.; Suyama, A.; Koguchi, Y.; Juto, N.; Raj, Y. L.; Winsley, G.; Selvasekarapandian, S.

    2011-01-01

    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 2x7 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 . (authors)

  17. Ac, La, and Ce radioimpurities in {sup 225}Ac produced in 40-200 MeV proton irradiations of thorium

    Energy Technology Data Exchange (ETDEWEB)

    Engle, Jonathan W.; Ballard, Beau D. [Los Alamos National Laboratory, NM (United States); Weidner, John W. [Air Force Institute of Technology, Wright Patterson Air Force Base, OH (United States); and others

    2014-10-01

    Accelerator production of {sup 225}Ac addresses the global supply deficiency currently inhibiting clinical trials from establishing {sup 225}Ac's therapeutic utility, provided that the accelerator product is of sufficient radionuclidic purity for patient use. Two proton activation experiments utilizing the stacked foil technique between 40 and 200 MeV were employed to study the likely co-formation of radionuclides expected to be especially challenging to separate from {sup 225}Ac. Foils were assayed by nondestructive γ-spectroscopy and by α-spectroscopy of chemically processed target material. Nuclear formation cross sections for the radionuclides {sup 226}Ac and {sup 227}Ac as well as lower lanthanide radioisotopes {sup 139}Ce, {sup 141}Ce, {sup 143}Ce, and {sup 140}La whose elemental ionic radii closely match that of actinium were measured and are reported. The predictions of the latest MCNP6 event generators are compared with measured data, as they permit estimation of the formation rates of other radionuclides whose decay emissions are not clearly discerned in the complex spectra collected from {sup 232}Th(p,x) fission product mixtures. (orig.)

  18. 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 ...

  19. A new

    Directory of Open Access Journals (Sweden)

    Khaled H. Mohamed

    2013-10-01

    Conclusions: Pleurodesis with oral forms of doxycycline dissolved in sterile saline solution have a high success rate with a low incidence of complications and could be a good option as palliative therapy in patients with symptomatic malignant pleural effusions.

  20. Hepatitis A

    Science.gov (United States)

    ... Acute liver failure requires a stay in the hospital for monitoring and treatment. Some people with acute liver failure may need a liver transplant. Prevention The hepatitis A vaccine can prevent infection with the virus. The vaccine is typically given ...

  1. S A H A R A J

    African Journals Online (AJOL)

    (2004). Social, cultural and sexual behavioral determinants of observed decline in .... was given to a life orientation educator at the local high school who was ..... out of perceived invulnerability and imagined biological immunity, based on ...

  2. A Venkataraman

    Indian Academy of Sciences (India)

    Home; Journals; Bulletin of Materials Science. A Venkataraman. Articles written in Bulletin of Materials Science. Volume 24 Issue 6 December 2001 pp 617-621 Magnetic Materials. A new combustion route to -Fe2O3 synthesis · A Venkataraman Vijay A Hiremath S K Date S D Kulkarni · More Details Abstract Fulltext PDF.

  3. S A H A R A J

    African Journals Online (AJOL)

    The book begins with an outline of the importance of AIDS and its potential to impact on ... qualitative, comprising twenty case studies in which household livelihood ... analysis means that this section provides more of a story than systematic or ...

  4. A Demonstration and a Souvenir

    Science.gov (United States)

    Lentz, Randy

    1978-01-01

    Describes an activity using interchangeable, preset tool holders to provide a demonstration for parents or students attending a school's open house session that produces a small souvenir (an aluminum mini-chalice) for them. A procedure sheet for the school's individual lathe and specification diagrams for making the cup are provided. (TA)

  5. A commutator

    Energy Technology Data Exchange (ETDEWEB)

    Matsukura, K.

    1981-06-18

    The synchronous, electric micromotor of a time commutator, by means of a three staged cylindrical gear drive rotates a disk with a semirounded segmented notch, which, in turn, drives a Maltese cross. The gear drum, linked with the Maltese cross rotates a disk with an indicator, equipped with radial, spherical grooves, equidistant from each other. Radially projecting catches, which are used with rotation of the disk to accomplish elastic movement of a vertical shaft under the effect of a three beam, asymmetrical star, are mounted in the disk's grooves by means of spring loaded locking devices, in accordance with the required time technological program. There are driving and locking cams located on the lower end of the shaft. The first is of pear shaped section and provides drive to the microswitch, which commutates the output electrical circuit of the apparatus.

  6. 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.

  7. 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.

  8. 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;

  9. A manipulator

    International Nuclear Information System (INIS)

    Cole, G.V.; Hofmann, D.A.; Ashby, R.

    1984-01-01

    A manipulator is described, for remote handling of objects within an enclosure, by an operator outside the enclosure. The manipulator consists of a telescopically extensible arm member, the action of which is controlled by a motor-driven lead screw. (U.K.)

  10. 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

  11. A Singh

    Indian Academy of Sciences (India)

    Home; Journals; Bulletin of Materials Science. A Singh. Articles written in Bulletin of Materials Science. Volume 29 Issue 3 June 2006 pp 233-238 Biomaterials. External stimuli response on a novel chitosan hydrogel crosslinked with formaldehyde · A Singh S S Narvi P K Dutta N D Pandey · More Details Abstract Fulltext ...

  12. a arunkumar

    Indian Academy of Sciences (India)

    Home; Journals; Bulletin of Materials Science. A ARUNKUMAR. Articles written in Bulletin of Materials Science. Volume 40 Issue 7 December 2017 pp 1389-1396. Influence of donor substitution at D− π −A architecture in efficient sensitizers for dye-sensitized solar cells: first-principle study · A ARUNKUMAR M PRAKASAM ...

  13. Hepatitis A

    Science.gov (United States)

    ... is an inflammation of the liver. One type, hepatitis A, is caused by the hepatitis A virus (HAV). The disease spreads through contact with ... suggest medicines to help relieve your symptoms. The hepatitis A vaccine can prevent HAV. Good hygiene can also ...

  14. A Propposition.

    Science.gov (United States)

    1980-04-29

    of this paper. And most importantly to my lovely wife Pat I offer a sincere apology for the neglect she has suffered at the hands of a rugby playing...daughters go walking ( 3), overstay in the gar- den (61). A dragon kidnaps them (A1 ). A call for aid ( B1 ). Quest of three heroes (Cl). Three battles with...34 Information is provided to Dupin by B4 , announcement newspapers and depositions of misfortune (147-152). "...and besides, Le Bon once rendered B1

  15. 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 sealing...... means (10) wherein the engagement means (7) is adapted, via the sealing means, to seal the opening when the pressure of the container assembly differs from the ambient pressure in such a way that the central portion (5) flexes in the axial direction which leads to a radial tightening of the engagement...... means (7) to the container, wherein the container further comprises locking means (12) that can be positioned so that the central portion is hindered from flexing in at least one direction....

  16. A commutator

    Energy Technology Data Exchange (ETDEWEB)

    Siokhara, T.; Khibino, Y.; Tiaki, K.; Vatanabe, K.

    1981-06-22

    Switching of a microswitch, which switches the output electrical circuits of a unit, which supports control of industrial processes in time, is accomplished by a two arm rocking lever. The lever is driven by a cam mechanism, linked with a complex, multistage mechanical drive, which includes cylindrical gear drives and cam couplings for linkage, rotated by a synchronous electric micromotor. The unit is equipped with two subassemblies for establishment of process control: in functions of conditional time and functions of the times of day. The dials of the subassemblies for time establishment, located on the facial panel of the instrument, are equipped with arrows for the assigners with illumination and signal lamps. The lights control the mode of electric power for the instrument and the modes of the output circuits of the commutating subassembly.

  17. A separator

    Energy Technology Data Exchange (ETDEWEB)

    Prokopyuk, S.G.; Dyachenko, A.Ye.; Mukhametov, M.N.; Prokopov, O.I.

    1982-01-01

    A separator is proposed which contains separating slanted plates and baffle plates installed at a distance to them at an acute angle to them. To increase the effectiveness of separating a gas and liquid stream and the throughput through reducing the secondary carry away of the liquid drops and to reduce the hydraulic resistance, as well, openings are made in the plates. The horizontal projections of each opening from the lower and upper surfaces of the plate do not overlap each other.

  18. 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.

  19. A Sarangarajan

    Indian Academy of Sciences (India)

    Home; Journals; Resonance – Journal of Science Education. A Sarangarajan. Articles written in Resonance – Journal of Science Education. Volume 5 Issue 10 October 2000 pp 81-89 Classroom. On IBM's Millennial Puzzle · A Sarangarajan · More Details Fulltext PDF ...

  20. A Ghosh

    Indian Academy of Sciences (India)

    Home; Journals; Bulletin of Materials Science. A Ghosh. Articles written in Bulletin of Materials Science. Volume 26 Issue 2 February 2003 pp 217-220 Synthesis. Effect of sillimanite beach sand composition on mullitization and properties of Al2O3–SiO2 system · H S Tripathi B Mukherjee S K Das A Ghosh G Banerjee.

  1. A Sarkar

    Indian Academy of Sciences (India)

    Home; Journals; Bulletin of Materials Science. A Sarkar. Articles written in Bulletin of Materials Science. Volume 23 Issue 4 August 2000 pp 319-324 Polymers. An experimental investigation of electrical conductivities in biopolymers · H Mallick A Sarkar · More Details Abstract Fulltext PDF. Gum arabica obtained from acacia ...

  2. A REFLECTION

    African Journals Online (AJOL)

    Man has not been prodigiously provided for by nature; on account of it man ..... There was a 'cross' as the spiritual passed through the physical, a reaction took ... mind an idea of motion, movement, action and development within man and within .... of activity, that of grace, live and mercy but one must make move unto God ...

  3. Skovsted, A

    Indian Academy of Sciences (India)

    cotyledon stage, whereas the hybrid with New World cotton Was healthy ... an unreduced egg of Asiatic cotton analogous to that found in a hybrid between Asiatic ... G. herbaceum war. Wightictinct G. herbaceut and var. (fricanct. O 1027 A.L.E. Il Guza,. O7 Moamba, H2 Iraqi. 3 N289. H5 N454. (iii) Species with 52 Sonatic ...

  4. A Shukla

    Indian Academy of Sciences (India)

    Home; Journals; Resonance – Journal of Science Education. A Shukla. Articles written in Resonance – Journal of Science Education. Volume 20 Issue 6 June 2015 pp 532-541 General Article. Latent Heat Storage Through Phase Change Materials · Akanksha Mishra A Shukla Atul Sharma · More Details Fulltext PDF ...

  5. A Oudhia

    Indian Academy of Sciences (India)

    Home; Journals; Bulletin of Materials Science. A Oudhia. Articles written in Bulletin of Materials Science. Volume 37 Issue 1 February 2014 pp 15-18. Green wet chemical route to synthesize capped CdSe quantum dots · A Oudhia P Bichpuria · More Details Abstract Fulltext PDF. In the present work, we report green ...

  6. A Yazhini

    Indian Academy of Sciences (India)

    Home; Journals; Resonance – Journal of Science Education. A Yazhini. Articles written in Resonance – Journal of Science Education. Volume 23 Issue 1 January 2018 pp 57-67 General Article. Small Open Reading Frames: Tiny Treasures of the Non-coding Genomic Regions · A Yazhini · More Details Abstract Fulltext ...

  7. 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...

  8. 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...

  9. Bisphenol A

    Science.gov (United States)

    ... Skip to main content ENVIRONMENTAL HEALTH CONCERNS AND TOXIC CHEMICALS WHERE YOU LIVE, WORK, AND PLAY Search:  Home ... Tree Farm and Logging Uranium Tailings Urban and Industrial Runoff Urban ... Acetone Ammonia Arsenic Asbestos Benzene Bisphenol A (BPA) ...

  10. 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...

  11. Vitamin A

    Science.gov (United States)

    ... carrots, and squash. Fruits, including cantaloupe, apricots, and mangos. Dairy products, which are among the major sources ... medicines might interfere with how your body absorbs, uses, or breaks down nutrients . Vitamin A and healthful ...

  12. 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)

  13. A Alemdar

    Indian Academy of Sciences (India)

    Home; Journals; Bulletin of Materials Science. A Alemdar. Articles written in Bulletin of Materials Science. Volume 27 Issue 3 June 2004 pp 317-322 Surfactants. Effect of sodium dodecyl sulfate on flow and electrokinetic properties of Na-activated bentonite dispersions · E Günıster S İşçı A Alemdar N Güngör · More Details ...

  14. 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.

  15. 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.

  16. 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 many...

  17. 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…

  18. 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.

  19. A Reminiscence

    Science.gov (United States)

    Gobind Khorana, H.

    1997-12-01

    Leslie Orgel and Francis Crick with Gobind Khorana in Madison, Wisconsin (December 1965). I first met Leslie at the Endicott House (MIT) in February 1964. Leslie was then spending a period of time at MIT and the occasion was a party for him. During our conversation, Leslie talked about starting some experimental work. He seemed to be particularly interested in polyphosphates and the chemical activation of small molecules (building blocks). Shortly after his move to the Salk Institute in the Fall of 1964 I visited him in January 1965. He already had a lab going. I remember meeting Jim Ferris, in particular, and John Sulston sometime later. That particular time was exciting for my research as well. We had the first results on the Genetic Code using the chemical-biochemical approach that my lab had developed. Francis Crick was also at the Salk Institute during the time of my visit. Both Leslie and Francis were very excited by my results and they began to ask a lot of questions and gave me a whole lot of suggestions about further experiments. In fact, my thinking and planning of things that we were doing were so scrutinized and clarified during these discussions that, it seemed to me, my own group had only to turn out all the experiments that were needed. These interactions with Francis and Leslie continued intensively throughout that year and later. In fact, both Leslie and Francis accepted my invitation to Madison in December 1965 for more discussions. Since those early days of the Salk Institute, I have made numerous visits over the years to Leslie and his research group. It has always been very exciting to learn about the many discoveries bearing on chemical evolution that have unfolded from Leslie's research group. In addition, I have always benefitted from the insightful comments that Leslie invariably provided on my own research. I look forward to our continued interactions and friendship in the future. Leslie, A Happy Birthday!

  20. A Aspirina e a Asma

    Directory of Open Access Journals (Sweden)

    K.S. Babu

    2001-03-01

    Full Text Available RESUMO: A aspirina é não só o fannaco me1hor estudado em todo o mundo, como o mais frequentemente uti1izado em todos os tempos. Alem das suas propriedades como analgesico e antipiretico, o acido acetilsalicflico (AAS e urn inibidor da agregação plaquetária, o que the confere urn papel essencial na profilaxia do tromboembolismo e na prevenção dos acidentes cardio e cerebro-vasculares.A associação da sensibilidade á aspirina, com a asma e a polipose nasal, descrita pela primeira vez por Femand Widal e colaboradores, constitui a trfade da “Asma lnduzida pela Aspirina” (AlA e refere-se ao desenvolvimento de urn quadro de broncoconstrição em indivfduos asmaticos após ingestao de aspirina. Nestes doentes, os sintomas agudos sobrepõem-se ao quadro clfnico de asma crónica grave. As crises de asma podem ser desencadeadas por pequenas quantidades de AAS ou de outros anti-inflamatórios nao ester6ides (AINE’ s.A prevalência da AIA na comunidade é incerta, mas os doentes com AIA constituem 10 a 20% da popula9ao asmatica, sendo a AIA mais frequente nas mulheres. Os autores deste trabalho fazem uma revisão teórica da AIA, descrevendo a apresentação clfnica, os mecanismos patogenicos, o diagnóstico e o tratamento deste síndrome.A asma e uma doença inflamatória crónica das vias aéreas. Neste estado de inflamação continua, a exposiyao aaspirina provoca no subgrupo de doentes com AIA uma acentuayao temporaria do processo inflamat6rio, que conduz á exacerbayao da asma. Embora assemelhando-se as reacçães de hipersensibilidade imediata, a AIA nao parece ser mediada por mecanismos dependentes da IgE, daí estas reacçães scrcm dcsignadas de “anafilactóides”.A hipersensibilidade à aspirina parece antes ser mediada por um desvio da via metab6lica do acido araquidónico no sentido da produção excessiva de leucotrienos, por

  1. A novel

    NARCIS (Netherlands)

    K.L.S. Chatalic (Kristell); J. Veldhoven-Zweistra (Joke); M. Bolkestein (Michiel); S. Hoeben (Sander); G.A. Koning (Gerben); O.C. Boerman (Otto); M. de Jong (Marion); W.M. van Weerden (Wytske)

    2015-01-01

    textabstractProstate-specific membrane antigen (PSMA) is overexpressed in prostate cancer (PCa) and a promising target for molecular imaging and therapy. Nanobodies (single-domain antibodies, VHH) are the smallest antibody-based fragments possessing ideal molecular imaging properties, such as high

  2. Hepatitis A

    Science.gov (United States)

    ... to 6 months. These symptoms may include dark yellow urine feeling tired fever gray- or clay-colored stools joint pain loss ... Kroger A, Wolfe S, eds. Epidemiology and Prevention of Vaccine-Preventable Diseases . 13th ed. Washington, DC: Public ... The NIDDK translates and disseminates research findings through its clearinghouses and education programs to ...

  3. A DIACONISA

    Directory of Open Access Journals (Sweden)

    Prof. Dr. Irineu Wilges

    1973-01-01

    Full Text Available The time is of freedom for women. The woman, is not born, she becomes to be, says Simone de Beauvoir in his Le Deuxie sexe. This seems to be the will of God and of man. Vatican II realizes a signal of the times in this fact that the woman REQUESTS the same rights as man.

  4. Chromogranin A

    Science.gov (United States)

    ... PF4 Antibody Hepatitis A Testing Hepatitis B Testing Hepatitis C Testing HER2/neu Herpes Testing High-sensitivity C-reactive Protein (hs-CRP) Histamine Histone Antibody HIV Antibody and HIV Antigen (p24) HIV Antiretroviral Drug Resistance Testing, Genotypic HIV Viral Load HLA Testing HLA- ...

  5. Hemophilia A

    Science.gov (United States)

    ... PA: Elsevier; 2016:chap 476. Srivastava A, Brewer AK, Mauser-Bunschoten EP, et al. Treatment Guidelines Working Group on Behalf of The World Federation Of Hemophilia. Haemophilia. 2013;19:e1-47. PMID: 22776238 www.ncbi.nlm.nih.gov/pubmed/ ...

  6. A due

    DEFF Research Database (Denmark)

    covering the period from the Middle Ages to the present day - give their voice in the honouring of the two scholars for their musical scholarship. As it may be seen from the table of contents, the publication covers a broad range both in time and in topics, which are all included in the scholarly sphere...

  7. 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...

  8. A Tribute

    Science.gov (United States)

    Bhattacharya, Dipankar

    2000-03-01

    Renowned astrophysicist Prof. Bhaskar Datta passed away in Bangalore on December 3rd, 1999 after a brave battle with cancer. He was 50. In his career spanning more than 25 years he worked extensively in the area of High-energy astrophysics, Astro-particle physics, General relativity and Cosmology. In particular, he specialized in the structure and properties of neutron stars. Prof. Datta was born and educated in Delhi. After obtaining his Master's degree in Physics from the Delhi University he worked in NORDITA, Copenhagen as a Guest Physicist. The following year he moved to the NASA Goddard Institute of Space Studies, New York, where he worked with Prof. V. Canuto for his Ph.D. thesis. He obtained his Ph.D. from City University of New York in 1977 for his work on spin-2 interaction in a relativistic neutron gas. He derived an equation of state of matter at high density using this interaction and demonstrated its effect on the derived masses and moments of inertia of neutron stars. Many years later he and his colleagues were to derive yet another Equation of State for neutron star matter, based on the chiral sigma model that includes a dynamically generated isoscalar vector field. Prof. Datta returned to India in 1978 after brief stays at University of Florida and International Centre for Theoretical Physics, Trieste, Italy. From 1978 to 1982 he worked at the Tata Institute of Fundamental Research, Mumbai. In 1982 he moved to the Indian Institute of Astrophysics, Bangalore where he worked until his death. He also held the position of an adjunct professorship at the Raman Research Institute, Bangalore. Prof. Datta's move to Bangalore coincided with the discovery of the fastest spinning neutron star known, namely the millisecond pulsar PSR 1937+21. By then already a recognised expert on neutron star structure, he plunged headlong into computing the structure with fast rotation. He, with his colleague Alak Ray, showed that the millisecond pulsar could be spinning

  9. A128

    Directory of Open Access Journals (Sweden)

    I. Pronina

    2015-11-01

    Full Text Available RCC is one of the main problems in oncourology. MiRNA expression profiles are highly specific for malignant tumors of different locations, and can be used to detect pathological molecular biomarkers and to develop the optimal treatment for each patient. Selection of miRNAs associated with the formation and development of malignant tumors in the kidney was performed using computer databases miRWalk (http://www.ma.uni-hei-delberg.de/apps/zmf/mirwalk/ and miRBase (http://www.mir-base.org/. Paired samples of tumor and histologically normal tissue from 46 patients with RCC were studied. RNA was isolated by phenol–chloroform extraction and treated with RNase-free DNase after isolation. MiRNA expression analysis was performed by RT-qPCR using Applied Biosystems (USA kits: TaqMan® MicroRNA Assays, TaqMan® MicroRNA Reverse Transcription Kit, TaqMan® Fast Universal PCR Master Mix (2x. RNU6B was used as reference miRNA. Quantity alterations of 20 microRNAs (hsa-miR-219, -203, -148a, -129, -9, -34a, -34b, -34c-3p, -127, -193a-5p, -191, -17, -24 -2*, -339 -3p, -212, -375, -125b, -124a, -132, -137 were determined in samples of tumor compared to normal tissue biopsy from the kidney of each patient. It was shown that the expression of studied miRNAs usually decreased in RCC tumors. The largest decrease of expression was observed for miR-129, which expression was10–350-fold reduced in 93% of the samples (P < 0.05 with no change of expression in the remaining 7% of cases. MiR-375 (80% of cases,10–270-fold decrease, miR-34b (79% of cases, 10–60-fold decrease, miR-124a (70% of cases, 10–200-fold decrease also frequently showed reduced expression in tumors. In addition to the aforementioned ones, it had been shown that expression in the tumor compared with histologically normal tissue from the same patient was significantly decreased in more than half of the cases for miR-125b, miR-127, miR-203, miR-34c-3p, miR-9. Despite the fact that in 50% of cases

  10. 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

  11. A Message Without a Code?

    Directory of Open Access Journals (Sweden)

    Tom Conley

    1981-01-01

    Full Text Available The photographic paradox is said to be that of a message without a code, a communication lacking a relay or gap essential to the process of communication. Tracing the recurrence of Barthes's definition in the essays included in Image/Music/Text and in La Chambre claire , this paper argues that Barthes's definition is platonic in its will to dematerialize the troubling — graphic — immediacy of the photograph. He writes of the image in order to flee its signature. As a function of media, his categories are written in order to be insufficient and inadequate; to maintain an ineluctable difference between language heard and letters seen; to protect an idiom of loss which the photograph disallows. The article studies the strategies of his definition in «The Photographic Paradox» as instrument of abstraction, opposes the notion of code, in an aural sense, to audio-visual markers of closed relay in advertising, and critiques the layout and order of La Chambre claire in respect to Barthes's ideology of absence.

  12. 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.

  13. 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.

  14. 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

  15. 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

  16. 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.

  17. [A nurse, a historian, a writer, a teaching specialist, a care designer, and ... a woman].

    Science.gov (United States)

    Vigil-Ripoche, Marie-André

    2011-12-01

    Marie-Françoise Collière (1930-2005) was a great lady of the nursing profession recognized worldwide for her expertise. As a historian, a pioneer and an activist of the cause of the female nurses and health care, she devoted her life to giving the profession the first meaning of care, ie: accompanying the patient through his life, from the birth to the death, through disease, accident and ageing. Thus, for Marie-Françoise Collière, "Caring means health-care through the satisfaction of a series of needs which are indispensable for life but which have diverse manifestations". Here is the story of her life and her trajectory.

  18. 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).

  19. A new

    Directory of Open Access Journals (Sweden)

    P. Upadhyay

    2016-07-01

    Full Text Available In this paper a population based evolutionary optimization methodology called firefly algorithm (FFA is applied for the optimization of system coefficients of the infinite impulse response (IIR system identification problem. FFA is inspired by the flash pattern and characteristics of fireflies. In FFA technique, behaviour of flashing firefly towards its competent mate is structured. In this algorithm attractiveness depends on brightness of light and a bright firefly feels more attraction for the brighter one. For this optimization problem, brightness varies inversely proportional to the error fitness value, so the position of the brightest firefly gives the optimum result corresponding to the least error fitness in multidimensional search space. Incorporation of different control parameters in basic movement equation results in balancing of exploration and exploitation of search space. The proposed FFA based system identification approach has alleviated from inherent drawbacks of premature convergence and stagnation, unlike genetic algorithm (GA, particle swarm optimization (PSO and differential evolution (DE. The simulation results obtained for some well known benchmark examples justify the efficacy of the proposed system identification approach using FFA over GA, PSO and DE in terms of convergence speed, identifying plant coefficients and mean square error (MSE fitness values produced for both same order and reduced order models of adaptive IIR filters.

  20. A lubricant

    Energy Technology Data Exchange (ETDEWEB)

    Parfenova, V.A.; Belov, P.S.; Guliaev, I.A.; Korenev, K.D.

    1979-07-30

    For the purpose of improving the thermo-oxidation stability of washing and protective properties, dithiophosphate of the metal having the formula ((pi-R-C/sub 6/H/sub 4/OCH/sub 2/-CH/sub 2/O)/sub 2/P(=S)S)/sub 2/M (where R is the alkyl of C/sub 8/--C/sub 12/ isostructure, M is either cadmium, barium, or zinc) (I) is added into the petroleum oil for the lubrication of car engine units and containing polyethylene oxyphenylpolyamine (PEP). The lubricant has the following composition, in %: PEP, 1 to 5; (I), 0.5 to 5; petroleum oil, up to 100. In order to produce a lubricant for petroleum oil, for example MT-16, PEF and (I) are added (R = octyl or dodecyl), it is heated up to 80/sup 0/ and mixed in a nitrogen current for one hour. The combination of the additives in the patented composition has synergistic activities and the oil being patented, according to operative properties, surpasses the oil with industrial dithiophosphate additive MNI-IP-22k.

  1. A Response

    Directory of Open Access Journals (Sweden)

    W. Warren Wagar

    2015-08-01

    Full Text Available Let me begin by thanking everyone who commented on my ASA paper, "Toward a Praxis of World Integration," both those who were generally sympathetic to its thesis and those who were not. It is inconceivable to me that any two freethinking human beings living in our time could share the same preferred model of the good society. So of course I am not surprised that no one found every aspect of my vision appealing or that some found almost nothing to applaud. I would probably react to each of your utopias in muchthe same ways. Nonetheless, our species needs, perhaps more than anything else, to think together about where we want to go, and how, and why. Without tclos, how can we speak of praxis? And without praxis, what use is analysis? The point is to change the world and change it for the better.

  2. A "Network" and a "Dictum"

    DEFF Research Database (Denmark)

    Harder, Henrik

    2003-01-01

    safety and accessibility problems in the urban areas created by the car. The strong ideal shared by the people within the "network" were based on the dictum "forms follow function" about mans behaviour, the car and the structure of the urban areas and was based on very little empirical research. The use...... of the urban planning thoughts expressed as road planning principles indicated and supported a changing perception of the urban areas, although people in the "network" (Le Corbusier, F. and Clarence S. Stein, US) had very different ideas about how the urban ideal itself should be expressed. Basically......, the recommendation concerning traffic and specifically the car was the same, segregation. This shift in perception had spatial implications: Firstly through the recommendation of turning the individual urban (residential) areas inwards or upwards i.e. away from the car traffic on the streets. Secondly...

  3. On a question of A. Balog

    OpenAIRE

    Shkredov, Ilya D.

    2015-01-01

    We give a partial answer to a conjecture of A. Balog, concerning the size of AA+A, where A is a finite subset of real numbers. Also, we prove several new results on the cardinality of A:A+A, AA+AA and A:A + A:A.

  4. 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.

  5. A method of installing a reactor container

    International Nuclear Information System (INIS)

    Hayashi, Kenji; Murakawa, Hisao.

    1975-01-01

    Object: To achieve exact installation of a reactor container at a site. Structure: A pole is set upright at the center of a cylindrical base portion, a plurality of beams are disposed around the pole in a radial fashion to form a cone, a plurality of steel plates are mounted successively around the cone through a ring, and the steel plates are welded to each other to assemble and install a reactor container at the same time. (Kamimura, M.)

  6. 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.

  7. 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.

  8. Can a String's Tension Exert a Torque on a Pulley?

    Science.gov (United States)

    Krause, Dennis E.; Sun, Yifei

    2011-01-01

    A typical textbook problem in rotational dynamics involves calculating the angular acceleration of a massive pulley due to a string, such as in the example shown in Fig. 1. The string is assumed to be massless and to move without slipping over the pulley, which is mounted on a frictionless axle. If T[subscript L] and T[subscript R] are the…

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

    OpenAIRE

    R Waxman; K Khorasani; A Lenny; S Bhalerao

    2009-01-01

    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...

  10. A design of a first wall for a demo reactor

    International Nuclear Information System (INIS)

    Bond, A.; Bond, R.A.; Cooke, P.I.H.

    1985-01-01

    A design of a first wall for a Demonstration reactor is reported based on an analysis of heat trasnport, sputtering damage, blanket neutronics and vacuum characteristics. The design comprises replaceable tungsten tiles radiatively cooled to a copper substrate, which in turn is cooled by high pressure helium. The overall engineering design of the first wall is described together with a discussion of the factors influencing the choice of design and materials

  11. 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.

  12. 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…

  13. [A woman with a postoperative lumbar swelling].

    Science.gov (United States)

    Hulshof, Hanna M; Elsenburg, Patric H J M; Frequin, Stephan T F M

    2013-01-01

    A 65-year-old woman had developed a large lumbar swelling in a period of four weeks following lumbar laminectomy. An MRI-scan revealed a large fluid collection, which had formed from the spinal canal. The diagnosis 'liquorcele', a rare complication of spine surgery, was established.

  14. Developing a Leadership Identity: A Grounded Theory

    Science.gov (United States)

    Komives, Susan R.; Owen, Julie E; Longerbeam, Susan D.; Mainella, Felicia C.; Osteen, Laura

    2005-01-01

    This grounded theory study on developing a leadership identity revealed a 6-stage developmental process. The thirteen diverse students in this study described their leadership identity as moving from a leader-centric view to one that embraced leadership as a collaborative, relational process. Developing a leadership identity was connected to the…

  15. A Cidade e a Criança

    Directory of Open Access Journals (Sweden)

    Maurícia Santos de Holanda Bezerra

    2013-01-01

    A autora Mayumi Watanabe de Souza Lima (1934-1994 foi arquiteta, sua carreira foi dedicada ao planejamento, projeto e construção de equipamentos públicos para a educação de crianças e de jovens. Suas obras, A Cidade e a Criança (1989 e Arquitetura e Educação (1995 revelam a preocupação com os projetos dos espaços de parques e escolas, principalmente, com os seus usuários.

  16. 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.

  17. A Thousand Cranes: A Curriculum of Peace.

    Science.gov (United States)

    Rees, Linda W.

    2000-01-01

    Relates the author's experiences as a teacher with a high school student, a soft-spoken Japanese young woman, who taught the author and her fellow high school students much about understanding, forgiveness, and peace. (SR)

  18. A farmer becomes a social pedagogue

    DEFF Research Database (Denmark)

    Mellon, Karsten

    2016-01-01

    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...... 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....

  19. 1955-IJBCS-Article-Ajayi A A

    African Journals Online (AJOL)

    hp

    A. chevalieri was grown in a synthetic medium containing starch as the sole carbon source. Culture ... The observed properties would aid in preserving the enzyme and knowing optimum ... Aspergillus chevalieri is a storage mould affecting ...

  20. DAIRY PRODUCTION: A NUTRITION INTERVENTION IN A ...

    African Journals Online (AJOL)

    DAIRY PRODUCTION: A NUTRITION INTERVENTION IN A SUGARCANE GROWING AREA IN WESTERN KENYA. ... African Journal of Food, Agriculture, Nutrition and Development ... The influence of dairy production and a select number of household characteristics on the children's nutritional status was evaluated.

  1. 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.

  2. Towards A Regional Science Academy: A Manifesto

    Directory of Open Access Journals (Sweden)

    Karima Kourtit

    2016-04-01

    Full Text Available This Manifesto provides a joint proposal to create a Regional Science Academy as a think-tank support platform for a strategic development of the spatial sciences. The Regional Science Academy is a strategic spatial knowledge catalyst: it acts as a global intellectual powerhouse for new knowledge network initiatives and scholarly views on regions and cities as vital centrepieces of interconnected spatial systems. This contribution highlights its role and presents various activity plans.

  3. A rose is a rose is a rose

    NARCIS (Netherlands)

    Vinkers, Christiaan H.

    2017-01-01

    Over a century ago in 1913, the poet Gertrude Stein wrote these famous words: sometimes things are just what they are. There has been a recent debate centred around the question whether or not schizophrenia exists. Is there a brain disease that can be called schizophrenia? What difference does it

  4. A rose is a rose is a rose’

    NARCIS (Netherlands)

    Vinkers, C H

    2017-01-01

    Over a century ago in 1913, the poet Gertrude Stein wrote these famous words: sometimes things are just what they are. There has been a recent debate centred around the question whether or not schizophrenia exists. Is there a brain disease that can be called schizophrenia? What difference does it

  5. A ROBOT AND A METHOD OF CONTROLLING A ROBOT

    DEFF Research Database (Denmark)

    2017-01-01

    The present invention relates to a robot comprising a horizontal or horizontally slanted transparent experiment layer being adapted to support items at arbitrary positions on or in the experiment layer, and a moveable sensor arranged below the transparent experimental layer said sensor being...

  6. A contabilidade a valor justo e a crise financeira mundial

    OpenAIRE

    Eric Barreto de Oliveira

    2009-01-01

    A contabilidade a valor justo tem sido discutida desde meados do século passado; porém, tomou força maior a partir de publicações recentes do FASB (Financial Accounting Standards Board) e do IASB (International Accounting Standards Board). Mais recentemente, em resposta à crise global de 2008, inicialmente chamada de crise do subprime, a SEC (Securities Exchange Comission), o FASB e o IASB rediscutiram exaustivamente este critério de mensuração, com o objetivo de detectar falhas que poderiam ...

  7. A system extinguishing a fire by insulating a liquid fuel

    International Nuclear Information System (INIS)

    Colome, Jacques; Duchene, Alain; Regnier, Jean.

    1975-01-01

    The invention refers to a system for quickly extinguishing a liquid fuel body on fire by insulating it completely from the ambient air. It applies particularly to the case of a high temperature liquid sodium sheet flowing accidentally from a circuit belonging to a fast neutron reactor. The system in question includes a lower receptacle for collecting the liquid fuel and a top cover shutting off the receptacle. This cover has inclined channels to take the liquid fuel flow and openings to allow this liquid through at the bottom end of the channels. These openings are closed by retractable shutters moving away under the pressure of the liquid in the channels and closing automatically after the liquid has flowed into the receptacle [fr

  8. Levitating a Magnet Using a Superconductive Material.

    Science.gov (United States)

    Juergens, Frederick H.; And Others

    1987-01-01

    Presented are the materials and a procedure for demonstrating the levitation of a magnet above a superconducting material. The demonstration can be projected with an overhead projector for a large group of students. Kits to simplify the demonstration can be purchased from the Institute for Chemical Education of the University of Wisconsin-Madison.…

  9. Locating a tree in a phylogenetic network

    NARCIS (Netherlands)

    Iersel, van L.J.J.; Semple, C.; Steel, M.A.

    2010-01-01

    Phylogenetic trees and networks are leaf-labelled graphs that are used to describe evolutionary histories of species. The Tree Containment problem asks whether a given phylogenetic tree is embedded in a given phylogenetic network. Given a phylogenetic network and a cluster of species, the Cluster

  10. Technology as a Fence and a Bridge

    Science.gov (United States)

    Wehrli, Bryan

    2009-01-01

    Cell phones, laptops, the Internet and social networking sites make teachers anxious and magnify the gap between teacher and student. The influx of devices creates a clamor, but little clarity for schools. When the author began investigating the issue, he discovered a heated debate and a spectrum of views. Then a colleague sent him Clayton…

  11. 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

  12. Locating a tree in a phylogenetic network

    OpenAIRE

    van Iersel, Leo; Semple, Charles; Steel, Mike

    2010-01-01

    Phylogenetic trees and networks are leaf-labelled graphs that are used to describe evolutionary histories of species. The Tree Containment problem asks whether a given phylogenetic tree is embedded in a given phylogenetic network. Given a phylogenetic network and a cluster of species, the Cluster Containment problem asks whether the given cluster is a cluster of some phylogenetic tree embedded in the network. Both problems are known to be NP-complete in general. In this article, we consider t...

  13. Starting a business through a franchise

    OpenAIRE

    Dubravka Mahaček; Maja Martinko Lihtar

    2013-01-01

    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 ...

  14. 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.

  15. A metaphysical journey in a comatose state.

    Science.gov (United States)

    Gimenez, R

    1992-01-01

    This paper is about the intense experience of being in the hospital in a comatose state resulting from an aneurysm with a massive brain hemorrhage and two subsequent surgeries. The event begins with a premonition of what will happen from a street name. The experience of brain surgeries, along with the fine care of the nurses, left me with a truly memorable impression. This paper describes the various feelings and strong emotions that I experienced while in a comatose state. It suggests that a patient in a comatose state can exist in a deep state of emotions close to ecstasy. The paper concludes with gratefulness to all the people who followed me step by step on this journey.

  16. Hepatic hypervitaminosis A: a familial observation.

    Science.gov (United States)

    Sarles, J; Scheiner, C; Sarran, M; Giraud, F

    1990-01-01

    Four siblings with hepatic fibrosis are described. The liver damage in these patients was secondary to chronic ingestion of massive doses of vitamin A for congenital ichthyosis. Although the extrahepatic manifestations were helpful in the diagnosis of hypervitaminosis A, the distinctive features of hepatic histopathology were confirmatory. The plasma concentrations of vitamin A and retinol-binding protein were misleading. The recovery from the liver damage in these patients was slow despite a complete withdrawal of the vitamin A intake. These cases show the importance of hepatic vitamin A assessment in the diagnosis of hepatic fibrosis.

  17. A flowsheet for a wave power unit

    Energy Technology Data Exchange (ETDEWEB)

    Sobierajski, E.; Kasperowicz, Z.

    1984-01-01

    A flowsheet is examined for a wave power unit designed to produce electricity, for flooding or drying a coastal zone, cleaning or protecting water areas of ports from sand deposits. The unit includes a vertical cylinder attached to the sea floor with input and output water ducts and valves. The cylinder has a rod with piston that is actuated through a flexible cable by float arranged next to the cylinder. The water injected under pressure into the pressure pipe can be used directly or as an intermediate energy source.

  18. A Compton polarimeter for CEBAF Hall A

    Energy Technology Data Exchange (ETDEWEB)

    Bardin, G; Cavata, C; Frois, B; Juillard, M; Kerhoas, S; Languillat, J C; Legoff, J M; Mangeot, P; Martino, J; Platchkov, S; Rebourgeard, P; Vernin, P; Veyssiere, C; CEBAF Hall A Collaboration

    1994-09-01

    The physic program at CEBAF Hall A includes several experiments using 4 GeV polarized electron beam: parity violation in electron elastic scattering from proton and {sup 4}He, electric form factor of the proton by recoil polarization, neutron spin structure function at low Q{sup 2}. Some of these experiments will need beam polarization measurement and monitoring with an accuracy close to 4%, for beam currents ranging from 100 nA to 100 microA. A project of a Compton Polarimeter that will meet these requirements is presented. It will comprise four dipoles and a symmetric cavity consisting of two identical mirrors. 1 fig., 10 refs.

  19. A Feasibility study of a mining business

    Directory of Open Access Journals (Sweden)

    Cehlár Michal

    2001-06-01

    Full Text Available The economic evaluation of a project requires a great deal of diverse information to be brought together in one place. The greatest concern is that there will be an error by omission, so it is useful to have a detailed list of what one needs to know in order to make a thorough evaluation.There are various of detail required at the different stages of evaluation in the project, from the "quick and dirty" overview to the pre-feasibility study, through a full detailed feasibility study, to a due diligence review. This list addresses most of the economic variables in project and can be used at all levels of studies. Its purpose is to identify a variable or issue and to raise a question, which the review can pursue in more detail using an increasingly more comprehensive checklist for each topic. While developed from the point of view of a new project, this list is equally valid for an ongoing operation.A feasibility study is defined as an assessment of all aspects of a project including technical, infrastructural, environmental, social, legislative and commercial factors, which is sufficiently detailed to support a decision on the implementation. Each project has an associated level of risk. For a proposed investment to increase the value of a firm's stock, it should have a higher expected rate of return than shareholders require for assuming that risk. Since investors demand for a higher potential returns from a riskier project, the cost of capital depends on the venture's risk.

  20. A walker used as a lifting device.

    Science.gov (United States)

    Glimskär, Bo; Hjalmarson, Jenny; Lundberg, Stefan; Larsson, Tore

    2014-05-01

    To develop assistive technology that would help an older person to arise from a kneeling position to a standing one. Developing a prototype, based on an inclusive design and then testing the prototype to verify the approach. The prototype was subsequently tested by a panel of 20 elderly users. These tests were observed and filmed. Participants' experiences of being lifted with the elevation seat were registered with the VIDAR ergonomic assessment system. None of the 20 participants used a walker at that time. In response to a question of whether, assuming they might have to use a walker in the future, they thought that a walker with an elevating seat would be helpful, 18 said that it would. Two of the participants did not believe that they would ever have to use a walker. A simple assistive technology such as a walker equipped with an elevating seat would in many of these cases simplify matters and reduce the distress of people who fall often. In addition, such a device can allow people who fall often to live in their homes longer. For caregivers dealing frequently with people who fall, this assistive device can contribute to decreasing occupational injuries. Development of a lifting device that can help people raise themselves up entirely on their own, or with minimal assistance, would be a revolutionary step for the individual. Lifting devices in use today requires much more extensive assistance from home helpers or others and due to the risk of injuries it is a great value for the helpers that easy to use devices develops. A walker equipped with an elevating seat could even provide a potential for people to stay in their homes longer.

  1. [Caffeine: a nutrient, a drug or a drug of abuse].

    Science.gov (United States)

    Pardo Lozano, Ricardo; Alvarez García, Yolanda; Barral Tafalla, Diego; Farré Albaladejo, Magí

    2007-01-01

    Coffee, tea, chocolate and caffeinated drinks are the main sources of caffeine, which is consumed in almost all ages and socioeconomic levels. Caffeine acts as a non-selective adenosine receptor antagonist in the central nervous system. Its main effects are as psychostimulant, acting in addition on the respiratory, muscular and cardiovascular systems. Basically, caffeine is metabolized by the hepatic cytochrome P-450 1A2 enzymes (CYP1A2). Several drugs can interact with its metabolism. The observed interindividual differences of its effects can be explained by variations in its metabolism. The main therapeutic use of caffeine is bronchodilator in respiratory diseases. Other possible uses are under investigation. Acute or chronic consumption of caffeine can induce several adverse effects, including intoxication that can be lethal. Finally, caffeine can be considered a drug of abuse. It has positive reinforcing actions, produces tolerance, and a withdrawal syndrome after stopping its consumption. Caffeine can cause different mental disorders such as dependence, which is not included in the DSM-IV-R, withdrawal syndrome and intoxication. Depending on its use, caffeine can be considered a nutrient, a drug or a drug of abuse.

  2. 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.

  3. 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.

  4. SOLAR ENERGY: A NECESSARY INVESTMENT IN A ...

    African Journals Online (AJOL)

    Dr Obe

    23, No. 1, March 2004. Okoro and Madueme. 58. SOLAR ENERGY: A NECESSARY INVESTMENT IN A DEVELOPING. ECONOMY ... research on how to develop the non-conventional methods of .... meat, vegetable, and dairy products.

  5. Life of a Tooth: A Visual Timeline

    Medline Plus

    Full Text Available ... Child First See a Dentist? The History of Dental Advances Why is Oral Health Important for Men? What is Baby Bottle Tooth Decay? Learn what those dental words mean. The Life of a Tooth Home | ...

  6. 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.

  7. A Book and a Friendship to Cherish.

    Science.gov (United States)

    Watt, Anne S.

    1989-01-01

    Relates how a child's love of Yoko Kawashima Watkins's book, So Far from the Bamboo Grove led to a friendship with Watkins. Considers the repercussions of this friendship on the child's reading motivation and development. (MM)

  8. 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.

  9. 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.

  10. 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.

  11. A review of onabotulinumtoxinA (Botox).

    Science.gov (United States)

    Lorenc, Z Paul; Kenkel, Jeffrey M; Fagien, Steven; Hirmand, Haideh; Nestor, Mark S; Sclafani, Anthony P; Sykes, Jonathan M; Waldorf, Heidi A

    2013-03-01

    OnabotulinumtoxinA was introduced to the US market in 2002 as the first botulinum toxin type A (BoNTA) approved for facial aesthetics. This article provides an overview of onabotulinumtoxinA's uses and indications as well as safety and efficacy data. As with other BoNTA products, onabotulinumtoxinA is generally well tolerated. Consideration is also given to clinical applications of the product. Information on handling, storage, and dosing is provided.

  12. 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

  13. A microcomputer for a packet switched network

    International Nuclear Information System (INIS)

    Seller, P.; Bairstow, R.; Barlow, J.; Waters, M.

    1982-12-01

    The Bubble Chamber Research Group of the Rutherford and Appleton Laboratory has a large film analysis facility. This comprises 16 digitising tables used for the measurement of bubble chamber film. Each of these tables has an associated microcomputer. These microcomputers are linked by a star structured packet switched local area network (LAN) to a VAX 11/780. The LAN, and in particular a microcomputer of novel architecture designed to act as the central switch of the network, is described. (author)

  14. A neutron calorimeter as a fusion diagnostic

    International Nuclear Information System (INIS)

    Proctor, A.E.; Harker, Y.D.; Neischmidt, E.B.

    1986-01-01

    A calorimeter is described which is applicable as a fusion neutron diagnostic. The advantages of the device are discussed, including: low sensitivity to thermal neutrons, no heat loss to surroundings, large dynamic range, small mass resulting in fair time resolution, and small physical size. The heat generation is provided by neutron induced fissions in a foil of 238 U and a calorimeter is isothermal. The effects, advantages and disadvantages of other target materials are discussed. Also discussed are time resolution and calibration

  15. Seckel syndrome: A report of a case

    OpenAIRE

    K Ramalingam; S D Kaliyamurthy; M Govindarajan; S Swathi

    2012-01-01

    Seckel syndrome, first defined by Seckel in 1960, is a rare (incidence 1:10,000), genetically heterogeneous autosomal recessive disorder presenting at birth. This syndrome is characterized by a proportionate dwarfism of prenatal onset, a severe microcephaly with a "bird-headed" like appearance (beaked nose, receding forehead, prominent eyes, and micrognathia), and mental retardation. The significance of dental alterations in this syndrome resides in the defect, hypoplastic enamel, being limit...

  16. A Masked Photocathode in a Photoinjector

    OpenAIRE

    Qiang, Ji

    2011-01-01

    In this paper, we propose a masked photocathode inside a photoinjector for generating high brightness electron beam. Instead of mounting the photocathode onto an electrode, an electrode with small hole is used as a mask to shield the photocathode from the accelerating vacuum chamber. Using such a masked photocathode will make the replacement of photocathode material easy by rotating the photocathode behind the electrode into the hole. Furthermore, this helps reduce the dark current or seconda...

  17. A Tutorial for Performing a Radiographic Examination

    Science.gov (United States)

    2017-03-01

    translatable. The area of the measurement should encompass the same materials and thicknesses for an accurate measurement. In the case of a weld inspection...digital image, a line pair gauge and/or duplex wire gauge can be used (ref. 6). These tools are similar in that they are small wires aligned in a...measure of what the smallest detectable feature is. In general practice, the duplex wire gauge can be more accurate and is easier to use since a

  18. Teaching a Course around a Textbook.

    Science.gov (United States)

    Healey, Mick; Ilbery, Brian

    1993-01-01

    Outlines the advantages and disadvantages of using a single textbook in a college-level economic geography course. Argues that, if a course text is used thoughtfully, the advantages can outweigh the disadvantages. Asserts that students must take greater responsibility for their own learning and develop independent inquiry skills. (CFR)

  19. A silvicultural guide for developing a sugarbush

    Science.gov (United States)

    Kenneth F. Lancaster; Russell S. Walters; Frederick M. Laing; Raymond T. Foulds

    1974-01-01

    A practical guide for the management of a sugarbush. Guidelines are established for the manipulation of stand density and stocking to promote the development of healthy vigorous trees with deep, wide crowns, the necessary attributes for highest possible yield of sugar-rich sap. Specific treatments are prescribed for sapling, poletimber and small sawtimber stands and a...

  20. On Embedding a Semigroup in a Group

    Indian Academy of Sciences (India)

    ias

    the significance of semigroup theory. Commenting ... theory, I think it is not too strong to say, with scorn, because ... on G. The most natural example of a semigroup is the set M(A) of ..... group. Since cancellation laws hold in a group and hence.

  1. 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...

  2. 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...

  3. Knitting: A Craft Makes a Comeback

    Science.gov (United States)

    McIntosh, Phyllis

    2011-01-01

    Hand knitting is one of the most popular hobbies in the United States. Once considered the province of grannies and expectant mothers stitching layettes, knitting is enjoying a 21st century resurgence, especially among young people. Knitting, it turns out, is a trendy, often eco-friendly pastime with a wide range of appeals. And, thanks to the…

  4. A prototype of a computerized patient record.

    Science.gov (United States)

    Adelhard, K; Eckel, R; Hölzel, D; Tretter, W

    1995-01-01

    Computerized medical record systems (CPRS) should present user and problem oriented views of the patient file. Problem lists, clinical course, medication profiles and results of examinations have to be recorded in a computerized patient record. Patient review screens should give a synopsis of the patient data to inform whenever the patient record is opened. Several different types of data have to be stored in a patient record. Qualitative and quantitative measurements, narratives and images are such examples. Therefore, a CPR must also be able to handle these different data types. New methods and concepts appear frequently in medicine. Thus a CPRS must be flexible enough to cope with coming demands. We developed a prototype of a computer based patient record with a graphical user interface on a SUN workstation. The basis of the system are a dynamic data dictionary, an interpreter language and a large set of basic functions. This approach gives optimal flexibility to the system. A lot of different data types are already supported. Extensions are easily possible. There is also almost no limit concerning the number of medical concepts that can be handled by our prototype. Several applications were built on this platform. Some of them are presented to exemplify the patient and problem oriented handling of the CPR.

  5. A case of tripody in a pigeon

    International Nuclear Information System (INIS)

    Luethgen, W.; Krautwald-Junghanns, M.E.

    1994-01-01

    In a pigeon of the breed ''Thuringian White Bib'' a stunted third leg was found, which was attached to the left of the ventral cloacal aspect. A disturbance of the embryonic development at the third to fourth day of incubation was thought to be the cause of this anomaly

  6. 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…

  7. A REVIEW A REVIEW AND INVESTIGATIONS AND ...

    African Journals Online (AJOL)

    User

    composition during mix designs, or by t addition of ... d aerated concrete having a designed density of 1600kg/m trength, tensile ..... bridge abutment, because it will not impose large lateral load on ..... determined by using a simple unreinforced beam subjected to a ... the maximum applied load (N), L is the span. (mm),b is ...

  8. A new way of editing a flora

    NARCIS (Netherlands)

    Burg, van der W.J.; Maesen, van der L.J.G.; Akoègninou, A.; Yédomonhan, H.

    2010-01-01

    Modern electronic tools have become common tools of most scientists. Flora writers and other botanists producing large manuscripts with a certain fixed structure may go even further and use the so-called Mail Merge option in a word processor such as Microsoft Word™. This tool allows structuring a

  9. 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

  10. 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.

  11. Pellets - A fuel with a future

    International Nuclear Information System (INIS)

    2004-01-01

    This special brochure presents a series of articles on the topic of wood pellets as a fuel of the future. Dr. Walter Steinmann, director of the Swiss Federal Office of Energy (SFOE) introduces the topic, stressing that the Swiss Confederation and the Cantons are supporting efforts to increase the sustainable use of wood fuels. Further articles take a closer look at pellets and their form. Pellets-fired heating units are introduced as a viable alternative to traditional oil-fired units. Tips are presented on the various ways of storing pellets. Quality-assurance aspects are examined and manufacturers and distributors of wood pellets are listed. A further article takes a closer look at a large Swiss manufacturer of pellets and describes the production process used as well as the logistics necessary for the transportation of raw materials and finished products. The brochure also presents a selection of pellet ovens and heating systems from various manufacturers. A further article illustrates the use of pellets as a means of heating apartment blocks built to the MINERGIE low-energy-consumption standard. In the example quoted, the classic combination of solar energy for the pre-heating of hot water and pellets for the central heating and hot water supply is used. The use of a buried spherical tank to store pellets - and thus the saving of space inside the building - is described in a further article that takes a look at the refurbishment of the heating system in a single-family home. Finally, various contributions presented at the Pellets Forum held in Berne in November 2003 are summarised in a short article

  12. 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.

  13. A review of AbobotulinumtoxinA (Dysport).

    Science.gov (United States)

    Lorenc, Z Paul; Kenkel, Jeffrey M; Fagien, Steven; Hirmand, Haideh; Nestor, Mark S; Sclafani, Anthony P; Sykes, Jonathan M; Waldorf, Heidi A

    2013-03-01

    AbobotulinumtoxinA was approved by the US Food and Drug Administration in 2009 as the second botulinum neurotoxin type A (BoNTA) for use in facial aesthetics. This article provides an overview of abobotulinumtoxinA's applications and indications as well as safety and efficacy data. AbobotulinumtoxinA is generally well tolerated. Adverse events from abobotulinumtoxinA are similar to those reported with other BoNTA products. Clinical applications of the product are also discussed in this article. Information on handling, storage, and dosing is provided.

  14. A Wimba Way, A Wimba Way

    OpenAIRE

    Beck, Charlotte; Miller, Katherine; Taylor, Sally

    2010-01-01

    Wimba Classroom, like other online teaching tools, gives us a way to connect to our learners at a distance. This software can be used to share desktops, PowerPoint presentations, polls and more. Come and see a demonstration of the software and hear how we’re using Wimba Classroom to teach health care practitioners in a distance education program, undergraduate students in a first-year biology course and participants in an online RefWorks workshop. We’ll also talk about our “Train the Trainer”...

  15. A beam scraper using a linear motor

    International Nuclear Information System (INIS)

    Beadle, E.R.; Rodger, E.S.; Thern, R.E.

    1989-01-01

    A beam scraper using a linear motor drive has been developed for use in the AGS at Brookhaven National Laboratory. The device is used to measure beam size by moving a target to a predetermined location and measuring the intercepted beam with nearby loss monitors or by noting the decrease in the circulating beam current. This device has excellent vacuum characteristics, as the motor and sensor coils are outside the vacuum, coupled magnetically to the moving parts which, are inside. There are no bellows or dynamic seals required. The position-time profile is controlled by a closed-loop servo system which uses position feedback. 2 refs., 4 figs

  16. Seckel syndrome: a report of a case.

    Science.gov (United States)

    Ramalingam, K; Kaliyamurthy, S D; Govindarajan, M; Swathi, S

    2012-01-01

    Seckel syndrome, first defined by Seckel in 1960, is a rare (incidence 1:10,000), genetically heterogeneous autosomal recessive disorder presenting at birth. This syndrome is characterized by a proportionate dwarfism of prenatal onset, a severe microcephaly with a "bird-headed" like appearance (beaked nose, receding forehead, prominent eyes, and micrognathia), and mental retardation. The significance of dental alterations in this syndrome resides in the defect, hypoplastic enamel, being limited to the primary dentition; in most instances the second primary molar tooth is not affected. A case of the Seckel syndrome is presented.

  17. Seckel syndrome: A report of a case

    Directory of Open Access Journals (Sweden)

    K Ramalingam

    2012-01-01

    Full Text Available Seckel syndrome, first defined by Seckel in 1960, is a rare (incidence 1:10,000, genetically heterogeneous autosomal recessive disorder presenting at birth. This syndrome is characterized by a proportionate dwarfism of prenatal onset, a severe microcephaly with a "bird-headed" like appearance (beaked nose, receding forehead, prominent eyes, and micrognathia, and mental retardation. The significance of dental alterations in this syndrome resides in the defect, hypoplastic enamel, being limited to the primary dentition; in most instances the second primary molar tooth is not affected. A case of the Seckel syndrome is presented.

  18. Morphing a plasmonic nanodisk into a nanotriangle.

    Science.gov (United States)

    Schmidt, Franz P; Ditlbacher, Harald; Hofer, Ferdinand; Krenn, Joachim R; Hohenester, Ulrich

    2014-08-13

    We morph a silver nanodisk into a nanotriangle by producing a series of nanoparticles with electron beam lithography. Using electron energy loss spectroscopy (EELS), we map out the plasmonic eigenmodes and trace the evolution of edge and film modes during morphing. Our results suggest that disk modes, characterized by angular order, can serve as a suitable basis for other nanoparticle geometries and are subject to resonance energy shifts and splittings, as well as to hybridization upon morphing. Similar to the linear combination of atomic orbitals (LCAO) in quantum chemistry, we introduce a linear combination of plasmonic eigenmodes to describe plasmon modes in different geometries, hereby extending the successful hybridization model of plasmonics.

  19. A case of a found radiographic source

    International Nuclear Information System (INIS)

    Pucelj, B.; Korun, M.; Kavsek, D.; Kreft, Z.; Krizman, M.; Martincic, R.; Rosman, M.; Sutej, T.

    1996-01-01

    High dose-rate levels were detected outdoors in the vicinity of a bunker used for storage of radiographic sources in a plant which manufactures metallic products. The investigation revealed that radiation was due to a buried sealed radiographic source, containing 28 GBq of 137 Cs. A special republic radiological emergency team removed the source in a carefully planned operation. There was no evidence for overexposure of the population or of radiographic and other workers of the plant. The highest dose to the recovery team was 50 μSv

  20. A game is a game is a game

    DEFF Research Database (Denmark)

    Jørgensen, Ida Kathrine Hammeleff

    2017-01-01

    Recently self-referentiality have occurred as a trend among game designers and have also enjoyed sporadic attention in academia. However, in academia, discussions of self-referential games often rest on proceduralist arguments and a too exclusive focus on the game object. This paper draws...... on the typology of meta-pictures developed by art historian J.W.T. Mitchell. Based on this typology, this paper discusses the notion of meta-games and suggest a broad conception of such games that includes not only the game object, but also the player and the discourse in which it is interpreted....

  1. A face in a (temporal) crowd.

    Science.gov (United States)

    Hacker, Catrina M; Meschke, Emily X; Biederman, Irving

    2018-03-20

    Familiar objects, specified by name, can be identified with high accuracy when embedded in a rapidly presented sequence of images at rates exceeding 10 images/s. Not only can target objects be detected at such brief presentation rates, they can also be detected under high uncertainty, where their classification is defined negatively, e.g., "Not a Tool." The identification of a familiar speaker's voice declines precipitously when uncertainty is increased from one to a mere handful of possible speakers. Is the limitation imposed by uncertainty, i.e., the number of possible individuals, a general characteristic of processes for person individuation such that the identifiability of a familiar face would undergo a similar decline with uncertainty? Specifically, could the presence of an unnamed celebrity, thus any celebrity, be detected when presented in a rapid sequence of unfamiliar faces? If so, could the celebrity be identified? Despite the markedly greater physical similarity of faces compared to objects that are, say, not tools, the presence of a celebrity could be detected with moderately high accuracy (∼75%) at rates exceeding 7 faces/s. False alarms were exceedingly rare as almost all the errors were misses. Detection accuracy by moderate congenital prosopagnosics was lower than controls, but still well above chance. Given the detection of the presence of a celebrity, all subjects were almost always able to identify that celebrity, providing no role for a covert familiarity signal outside of awareness. Copyright © 2018 Elsevier Ltd. All rights reserved.

  2. A sensitive technology for a sensitive challenge

    Directory of Open Access Journals (Sweden)

    Audrey Dodo

    2012-05-01

    Full Text Available This paper deals with technology and its applications for an ageing population. It aims at discussing the issues raised by such a relationship and highlights healthcare-related designs. It questions the notion of product acceptance and points out some challenges that need to be met by designers and engineers. The overall experience provided by owning and using a product must be designed in a holistic way, placing the human, his or her needs and feelings, as central guiding factors. These issues are further explained with the presentation of a design project made by Audrey Dodo and Teresa Georgallis, within the frame of a competition at the Royal College of Art in London: a self-monitoring health service, a toothbrush that assesses the user’s health state through his or her mobile phone.

  3. A vision system for a Mars rover

    Science.gov (United States)

    Wilcox, Brian H.; Gennery, Donald B.; Mishkin, Andrew H.; Cooper, Brian K.; Lawton, Teri B.; Lay, N. Keith; Katzmann, Steven P.

    1988-01-01

    A Mars rover must be able to sense its local environment with sufficient resolution and accuracy to avoid local obstacles and hazards while moving a significant distance each day. Power efficiency and reliability are extremely important considerations, making stereo correlation an attractive method of range sensing compared to laser scanning, if the computational load and correspondence errors can be handled. Techniques for treatment of these problems, including the use of more than two cameras to reduce correspondence errors and possibly to limit the computational burden of stereo processing, have been tested at JPL. Once a reliable range map is obtained, it must be transformed to a plan view and compared to a stored terrain database, in order to refine the estimated position of the rover and to improve the database. The slope and roughness of each terrain region are computed, which form the basis for a traversability map allowing local path planning. Ongoing research and field testing of such a system is described.

  4. A marketing strategy for a nursing college

    Directory of Open Access Journals (Sweden)

    M. Pryde

    1995-03-01

    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.

  5. 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.

  6. 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, raising...... a child. When a child is stillborn or dies at a very young age, this event not only turns off all hopes for this particular child, but also all good things envisioned for the child and his or her family, the world itself changes radically. At the Danish website Mindet.dk, parents engage in ritualizations...... and are not about “translating” the everyday experience into, for instance, a religious realm. Rather “the work of ritual … involves developing repertoires that operate in complex interplay with the world of everyday experience” and, eventually, through time and repetition, lead to re-experiencing life....

  7. A PULSED, PRECESSING JET IN CEPHEUS A

    International Nuclear Information System (INIS)

    Cunningham, Nathaniel J.; Moeckel, Nickolas; Bally, John

    2009-01-01

    We present near-infrared H 2 , radio CO, and thermal infrared observations of the nearby massive star-forming region Cepheus A (Cep A). From H 2 bow shocks arranged along four distinct jet axes, we infer that the massive protostellar source HW2 drives a pulsed, precessing jet that has changed its orientation by about 45 deg. in roughly 10 4 years. The current HW2 radio jet represents the most recent event in this time series of eruptions. This scenario is consistent with the recent discovery of a disk around HW2, perpendicular to the current jet orientation, and with the presence of companions at projected distances comparable to the disk radius. We propose that the Cep A system formed by the disk-assisted capture of a sibling star by HW2. We present a numerical model of a 15 M sun star with a circumstellar disk, orbited by a companion in an inclined, eccentric orbit. Close passages of the companion through or near the disk result in periods of enhanced accretion and mass loss, as well as forced precession of the disk and associated orientation changes in the jet. The observations reveal a second powerful outflow that emerges from radio source HW3c or HW3d. This flow is associated with blueshifted CO emission and a faint H 2 bow shock to the east, and with HH 168 to the west. A collision between the flows from HW2 and HW3c/d may be responsible for X-ray and radio continuum emission in Cep A West.

  8. ⌋ ⌉ ⌊ ⌈ A AA A AA A AA

    African Journals Online (AJOL)

    Dr AB Ahmed

    INTRODUCTION. Encryption is the process of transforming a plaintext to ciphertext with ... being sent. Different encryption algorithms are gaining currency with .... military secrets, diplomatic mission to secure classified messages. It can found ...

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

    Science.gov (United States)

    Alkin, Marvin C

    2017-08-01

    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. Copyright © 2016 Elsevier Ltd. All rights reserved.

  10. 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.

  11. 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...... relates to a method for manufacturing a strain gauge as mentioned above....

  12. Tickle with a feather

    African Journals Online (AJOL)

    Dip a handful of fresh stinging nettle leaves in water, pound in a mortar, squeeze in a wringing cloth, and squirt the liquid up the nostril with a small syringe. Does a member of your family suffer from knock-knees? Well, Mr Beeton has a recorded testimony from a satisfied correspondent who was once badly knock-kneed and ...

  13. Shaping a Scientific Self

    DEFF Research Database (Denmark)

    Andrade-Molina, Melissa; Valero, Paola

    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...... the importance of having students following the path of what schools perceive a real scientist is, no to become a scientist, but to become a logical thinker, a problem solver, a productive citizen who uses reason....

  14. Is the A1 a resonance

    International Nuclear Information System (INIS)

    Morgan, D.

    1975-06-01

    Data on diffractive and charge exchange 3π production in the Jsup(P) = 1 + state are shown to favour a resonance interpretation, although with a somewhat higher mass than the conventional A 1 bump. Data are fitted using a two-component model for the production amplitude. The first component comprises the Deck (Born) contribution and its re-scattering corrections; the second represents the so-called 'direct-production' term. The conventional isobar approximation to unitarity is demanded; this forbids the intrusion of additional phases in the Born term, such as arise from projecting a Reggeized Deck amplitude. As a consequence, the phase of the 1 + S 3π production amplitude is predicted to execute a standard resonant variation with Msup(3π). This carries a striking implication for the interfering 'background' waves, 1 + P, 2 - P, 0 - S, relative to which the 1 + S amplitude fails to register any appreciable phase variation in phenomenological analyses. There is no obvious objection to ascribing resonance status to these three channels, of which only one, the 0 - , demands a new (π ') resonance. A running theme, which recurs whenever the results of phenomenological 3-body phase shift analyses are appealed to, is that dynamical features are best viewed in terms of effective matrix elements rather than partial cross-sections. (author)

  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 method for producing a hydrocarbon resin

    Energy Technology Data Exchange (ETDEWEB)

    Tsachev, A B; Andonov, K S; Igliyev, S P

    1980-11-25

    Rock coal resin (KS), for instance, with a relative density of 1,150 to 1,190 kilograms per cubic meter, which contains 8 to 10 percent naphthaline, 1.5 to 2.8 percent phenol and 6 to 15 percent substances insoluble in toluene, or its mixture with rock coal or oil fractions of resin are subjected to distillation (Ds) in a pipe furnace with two evaporators (Is) and a distillation tower with a temperature mode in the second stage of 320 to 360 degrees and 290 to 340 degrees in the pitch compartment. A hydrocarbon resin is produced with a high carbon content, especially for the production of resin and dolomite refractory materials, as well as fuel mixtures for blast furnace and open hearth industry.

  18. A model for a dia-electric

    International Nuclear Information System (INIS)

    Narnhofer, H.; Thirring, W.

    1989-01-01

    Andre Martin is the master of the Schroedinger equation. Where others may do with cheap approximations he would not buy anything but a conclusive result proved by hard analysis. In recent years he applied his skill to meson spectroscopy where one deals with confining potentials. As a birthday present we will offer him a charged medium which gives such a potential purely in the framework of electrodynamics. We realize that this is just a toy and not the mechanism realized in nature. There it is supposed to emerge from QCD where also nonlinear and quantum effects are important. But our model may provide a formal basis to the heuristic discussions one finds in textbooks [1,2]. 6 refs. (Author)

  19. Hoarding: From a Symptom to a Disorder

    Directory of Open Access Journals (Sweden)

    Suheyla Dogan Bulut

    2015-09-01

    Full Text Available Hoarding is a psychological disorder characterized by excessive collecting, storage and inability to discard large quantities of the objects, usually accompanying a severe level of distress or dysfunctionality. Despite the concept has been known for more than a century, it used to be conceptualized as a component of obsessive compulsive disorder. However, hoarding disorder appears as a distinct psychiatric disorder in the last updated version of the Diagnostic and Statistical Manual of Mental Disorders (DSM-5. Accordingly, in this review we aimed to make a general framework in understanding of hoarding disorder which is an attention-grabbing diagnosis in these days. In this regard, we addressed the etiology, clinical features of, and treatment approaches to hoarding disorder. [Psikiyatride Guncel Yaklasimlar - Current Approaches in Psychiatry 2015; 7(3.000: 319-332

  20. Does a point lie inside a polygon

    International Nuclear Information System (INIS)

    Milgram, M.S.

    1988-01-01

    A superficially simple problem in computational geometry is that of determining whether a query point P lies in the interior of a polygon if it lies in the polygon's plane. Answering this question is often required when tracking particles in a Monte Carlo program; it is asked frequently and an efficient algorithm is crucial. Littlefield has recently rediscovered Shimrat's algorithm, while in separate works, Wooff, Preparata and Shamos and Mehlhorn, as well as Yamaguchi, give other algorithms. A practical algorithm answering this question when the polygon's plane is skewed in space is not immediately evident from most of these methods. Additionally, all but one fails when two sides extend to infinity (open polygons). In this paper the author review the above methods and present a new, efficient algorithm, valid for all convex polygons, open or closed, and topologically connected in n-dimensional space (n ≥ 2)

  1. A system for biasing a differential amplifier

    International Nuclear Information System (INIS)

    Barbier, Daniel; Ittel, J.M.; Poujois, Robert

    1975-01-01

    This invention concerns a system for biasing a differential amplifier. It particularly applies to the integrated differential amplifiers designed with MOS field effect transistors. Variations in the technological parameters may well cause the amplifying transistors to work outside their usual operational area, in other words outside the linear part of the transfer characteristic. To ensure that these transistors function correctly, it is necessary that the value of the voltage difference at the output be equally null. To do this and to centre on the so called 'rest' point of the amplifier transfer charateristic, the condition will be set that the output potentials of each amplifier transistor should have a zero value or a constant value as sum. With this in view, the bias on the source (generally a transistor powered by its grid bias voltage) supplying current to the two amplifying transistors fitted in parallel, is permanently adjusted in a suitable manner [fr

  2. 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.

  3. A big measurement of a small moment

    Science.gov (United States)

    E Sauer, B.; Devlin, J. A.; Rabey, I. M.

    2017-07-01

    A beam of ThO molecules has been used to make the most precise measurement of the electron’s electric dipole moment (EDM) to date. In their recent paper, the ACME collaboration set out in detail their experimental and data analysis techniques. In a tour-de-force, they explain the many ways in which their apparatus can produce a signal which mimics the EDM and show how these systematic effects are measured and controlled.

  4. 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…

  5. A numerical simulation of a contrail

    Energy Technology Data Exchange (ETDEWEB)

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

    1998-12-31

    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. 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...... give solution procedures. When the circle to be located is restricted to be a great circle, some simplifications are possible....

  7. Slowing down modernity: A critique : A critique

    OpenAIRE

    Vostal , Filip

    2017-01-01

    International audience; The connection between modernization and social acceleration is now a prominent theme in critical social analysis. Taking a cue from these debates, I explore attempts that aim to 'slow down modernity' by resisting the dynamic tempo of various social processes and experiences. The issue of slowdown now accounts for a largely unquestioned measure, expected to deliver unhasty tempo conditioning good and ethical life, mental well-being and accountable democracy. In princip...

  8. [A Listeria breast abscess in a man].

    Science.gov (United States)

    Marsaudon, E; Berthy, J; Mamoune, S; Deniel, A; Ksiyer, S; Tiuca, D

    2018-03-01

    Listeriosis is a food-borne illness leading to bacteriemia or central nervous system infection especially in pregnant women or high-risk patients. It is rarely a localized infection. Breast contamination has rarely been reported in lactating women. We report a breast abscess in man. A 80 year old man, hypertensive and arrhythmic, was explored for weakness and dehydration. Type 2 diabetes and chronic lymphocytic leukemia were diagnosed. Clinical examination disclosed a breast abcess related to L monocytogenes infection. Histopathological study also revealed a breast subcutaneous infiltration by chronic lymphocytic leukemia. Listeriosis sometimes uncover an unknown immunosuppression, especially in the elderly. Breast is a non-sterile tissue containing a stable microbiome partly from digestive origin. It can thereby be contaminated by Listeria. The specific cutaneous infiltrate of chronic lymphocytic leukemia can create the conditions for a local infection. Copyright © 2017 Société Nationale Française de Médecine Interne (SNFMI). Published by Elsevier SAS. All rights reserved.

  9. Diprosopiasis in a lamb. A case report.

    Science.gov (United States)

    Mazzullo, G; Germanà, A; De Vico, G; Germanà, G

    2003-02-01

    Conjoined twinning has been reported in most of the domestic animal species. Among them, sheep have the highest incidence of craniofacial defects. A live male crossbreed dystocic two-headed lamb was delivered from a 2-year-old Pinzerita sheep after first mating. After 40 h of life, the lamb spontaneously died. The most important gross findings involved the head, whereas the examination of different organ and tissue sections did not reveal remarkable histomorphological changes. The lamb was classified as a conjoined twinning and, on the basis of the facial duplication, as a diprosopus tetraophtalmus.

  10. A level switch with a sound tube

    OpenAIRE

    赤池, 誠規

    2017-01-01

    Level switches are sensor with an electrical contact output at a specific liquid, powder or bulk level. Most of traditional level switches are not suitable for harsh environments. The level switch in this study connects a loudspeaker on top end of the sound tube. When liquid, powder or bulk closes bottom end of the sound tube, the level switch turns on. The level switch is suitable for harsh environments and easy to install. The aim of this study is to propose a level switch with a sound tube...

  11. A Case of a Magnesium Oxide Bezoar.

    Science.gov (United States)

    Iwamuro, Masaya; Saito, Shunsuke; Yoshioka, Masao; Urata, Haruo; Ueda, Kumiko; Yamamoto, Kazuhide; Okada, Hiroyuki

    2018-06-06

    A 75-year-old Japanese woman presented with nausea and appetite loss. Computed tomography showed a radiopaque substance in the stomach. Esophagogastroduodenoscopy revealed bezoars in the stomach, which were endoscopically retrieved. The bezoars were mainly composed of magnesium and oxide. Although bezoar formation associated with magnesium oxide consumption is infrequently encountered, the present case indicates that pharmacobezoar should be considered among the differential diagnoses in patients who demonstrate a radiopaque mass in the digestive tract and have a history of magnesium oxide use.

  12. AHP 47: A HEN FOR A HORSE

    Directory of Open Access Journals (Sweden)

    Rnam rgyal རྣམ་རྒྱལ།

    2017-04-01

    Full Text Available Long ago in the southeastern part of Tibet on the banks of a very large, fast-flowing river, there was a village where local farmers gathered to trade field produce, goods such as meat and dairy products from pastoral areas, silver and gold items, livestock, and weapons. A young man and his father lived together in this village. The young man had a business selling eggs. He was very content with his business because he had been doing the same thing every day for many years and it had become quite successful. ...

  13. Parkinson's: a syndrome rather than a disease?

    Science.gov (United States)

    Titova, Nataliya; Padmakumar, C; Lewis, Simon J G; Chaudhuri, K Ray

    2017-08-01

    Emerging concepts suggest that a multitude of pathology ranging from misfolding of alpha-synuclein to neuroinflammation, mitochondrial dysfunction, and neurotransmitter driven alteration of brain neuronal networks lead to a syndrome that is commonly known as Parkinson's disease. The complex underlying pathology which may involve degeneration of non-dopaminergic pathways leads to the expression of a range of non-motor symptoms from the prodromal stage of Parkinson's to the palliative stage. Non-motor clinical subtypes, cognitive and non-cognitive, have now been proposed paving the way for possible subtype specific and non-motor treatments, a key unmet need currently. Natural history of these subtypes remains unclear and need to be defined. In addition to in vivo biomarkers which suggest variable involvement of the cholinergic and noradrenergic patterns of the Parkinson syndrome, abnormal alpha-synuclein accumulation have now been demonstrated in the gut, pancreas, heart, salivary glands, and skin suggesting that Parkinson's is a multi-organ disorder. The Parkinson's phenotype is thus not just a dopaminergic motor syndrome, but a dysfunctional multi-neurotransmitter pathway driven central and peripheral nervous system disorder that possibly ought to be considered a syndrome and not a disease.

  14. 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.

  15. Playing a quantum game with a qutrit

    International Nuclear Information System (INIS)

    Sinha, Urbasi; Kolenderski, Piotr; Youning, Li; Zhao, Tong; Volpini, Matthew; Laflamme, Raymond; Jennewein, Thomas; Cabello, Adan

    2014-01-01

    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

  16. Finding a source inside a sphere

    International Nuclear Information System (INIS)

    Tsitsas, N L; Martin, P A

    2012-01-01

    A sphere excited by an interior point source or a point dipole gives a simplified yet realistic model for studying a variety of applications in medical imaging. We suppose that there is an exterior field (transmission problem) and that the total field on the sphere is known. We give analytical inversion algorithms for determining the interior physical characteristics of the sphere as well as the location, strength and orientation of the source/dipole. We start with static problems (Laplace’s equation) and then proceed to acoustic problems (Helmholtz equation). (paper)

  17. 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...

  18. A case of a ruptured dermoid cyst

    International Nuclear Information System (INIS)

    Munemoto, Shigeru; Ishiguro, Shuso; Kimura, Akira; Kogure, Yuzaburou; Wakamatsu, Kouichi; Shimizu, Hiroshi; Hayashi, Morimoto

    1988-01-01

    A case of a ruptured dermoid cyst presenting headaches and dizziness as the only symptoms is presented. A 60-year-old woman was admitted to our hospital after complaining of headaches for 5 years and of dizziness for 1 week. The results of physical and neurological examinations were normal. An X-ray of the skull revealed an intracranial calcification in the left frontal region. CT disclosed calcification and a large low-density area in the left parasellar region and the frontal lobe. The mass consisted of two different areas of density. There were multiple, isolated, low-density spots in the left Sylvian fissure and the interpeduncular cistern. No abnormal enhancement was seen by CECT. Angiograms showed an elevation of the A 1 portion of ACA and a lateral shift of MCA. A left fronto-temporal craniotomy was performed. Chronic or past leptomeningitis was suspected because of the arachnoid-membrane thickening. Multiple fatty globules were present in the left Sylvian fissure. A large, soft, fatty tumor was completely removed. The histologic diagnosis was a dermoid cyst. After this operation, the headaches and dizziness were reduced. It is unclear whether the headaches were caused by the compression of the tumor or by the meningeal irritation of the fatty debris. According to the findings on the arachnoid membrane, however, it seems likely that fatty debris detached from the tumor spilled out intermittently from the cyst into the subarachnoid space, resulting in meningeal irritation. (author)

  19. Simmondsia chinensis - a plant with a future

    Energy Technology Data Exchange (ETDEWEB)

    Hoeppe, C

    1975-10-01

    S. chinensis could become a new crop plant for the semi-arid tropics. Its seeds produce a liquid wax which is similar to sperm whale oil. S. chinensis is a permanent, evergreen, dioecious bush, growing up to 3 m in height and developing a deep taproot. The seed weight ranges from 0.3 to 1.1 g, they contain 43 to 56% of the wax. Places of origin are the deserts of Southwest USA and Northwest Mexico. Presently only seeds from wild populations are collected. The establishment of plantations is possible. Economic crops can be expected about 10 years after planting.

  20. A binaural beat constructed from a noise

    Science.gov (United States)

    Akeroyd, Michael A

    2012-01-01

    The binaural beat has been used for over one hundred years as a stimulus for generating the percept of motion. Classically the beat consists of a pure tone at one ear (e.g. 500 Hz) and the same pure tone at the other ear but shifted upwards or downwards in frequency (e.g., 501 Hz). An experiment and binaural computational analysis are reported which demonstrate that a more powerful motion percept can be obtained by applying the concept of the frequency shift to a noise, via an upwards or downwards shift in the frequency of the Fourier components of its spectrum. PMID:21218863

  1. SPOROTRICHOSIS: A CASE REPORT

    OpenAIRE

    Sudheer; Venkatakrishna; Nagaswetha; Manmohan

    2015-01-01

    Sporotrichosis is a rare disease in the Southern part of India. A sporadic case of sporotrichosis restricted to primary site of inoculation in a 11-years old student from a non–endemic region of Telangana has been described.

  2. Fighting a family's corner.

    Science.gov (United States)

    2016-12-08

    Why did you become a children's nurse? I was working in retail as a manager with Tesco when I decided to work in healthcare. I qualified as a learning disability nurse before returning to university to complete a paediatric qualification.

  3. A Proposal for a Mindset of a Project Manager

    DEFF Research Database (Denmark)

    Eriksson, Joakim; Hansen, Claus Thorp

    2008-01-01

    and clarification of decision situations and consequences is rarely used in practice and structured reasoning about project and product performance when making decisions is also rare. In order to enhance the project managers’ understanding of decision-making in product development projects, the objective......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....... In product development projects it is desirable to reduce the level of uncertainty in order to make decisions without having to redo them later in the project resulting in longer lead time and higher costs. It is the project manager’s responsibility to manage this uncertainty in a complex ever...

  4. A FOTOGRAFIA ENTRE A ARTE POPULAR E A ARTE ERUDITA

    Directory of Open Access Journals (Sweden)

    Marcos Fabris

    2013-09-01

    Full Text Available Este artigo pretende discutir alguns dos aspectos que marcam o estabelecimento e a dissolução das fronteiras entre dois pólos convencionalmente descritos como arte culta e arte popular, tecendo paralelos entre o teatro de variedades, forma de expressão popular por excelência, e a fotografia, expressão artística que desde seus primórdios circula entre os dois extremos deste contínuo. Nestes termos, ambiciona-se verificar como determinadas condições sócio-históricas favorecem a criação de recursos formais que minimizam, ou suprimem, tais distinções consagradas pela crítica de arte.

  5. A unilateral optic perineuritis in a teenager - A case report.

    Science.gov (United States)

    Ameilia, Ahmad; Shatriah, Ismail; Wan-Hitam, Wan Hazabbah; Yunus, Rohaizan

    2015-06-01

    Optic perineuritis is an uncommon inflammatory disorder that involves optic nerve sheath. Numerous case reports have been published on optic perineuritis in adults, the majority of whom had bilateral presentation. There are limited data on optic perineuritis occurring in pediatric patients. We report a teenager who presented with a unilateral sign that mimicked the presentation of optic neuritis. The orbit and brain magnetic resonance imaging confirmed features of unilateral optic perineuritis. She was treated with a high dose of corticosteroids for 2weeks, and her final visual outcome was satisfactory. No signs of relapse were noted during follow-up visits. Copyright © 2014 The Japanese Society of Child Neurology. Published by Elsevier B.V. All rights reserved.

  6. 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.

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

    Directory of Open Access Journals (Sweden)

    ERIKA BIDDLE

    2010-01-01

    Full Text Available For researchers working within a critique of capitalism and its relation to knowledge production, it is problematic to use traditional research methodologies endemic to the very system being critiqued unless they are somehow altered. This article investigates the potential of schizoanalysis to provide conceptual tools for such an approach. Developed through the collaborative work of Deleuze and Guattari, schizoanalysis operates from the organic principle that knowledge is an indivisible part of the way we live in the world. However, schizoanalysis is not a research methodology; it inserts itself into research methodologies, warps them, and reproduces itself through them.

  8. A norse electric power ''a la carte''

    International Nuclear Information System (INIS)

    2002-01-01

    Big consumers, the norse countries opened the electric power market to offer to the enterprises and the individual consumers many suppliers and also different energy sources choice. It seems that this offer is not always followed by a tariffs decrease. (A.L.B.)

  9. 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…

  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 an...

  11. 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,…

  12. Life of a Tooth: A Visual Timeline

    Medline Plus

    Full Text Available ... Dental Advances Learn what those dental words mean. The Life of a Tooth Home | InfoBites | Find a Dentist | Your Family's Oral Health | RSS About AGD | Contact AGD | Site Map | Reprints and Permissions | Privacy Statement | Terms and Conditions © 1996-2018 Academy of General Dentistry. All Rights Reserved.

  13. A-THREE: a user's manual

    International Nuclear Information System (INIS)

    Auerbach, E.H.

    1977-06-01

    A-THREE is an optical-model code for elastic scattering, specifically designed for the requirements of heavy-ion projectiles. Fast search procedures for fitting model parameters to experimental data are provided. Because of structural similarity, provision for bound-state calculation is also included. In a sense, this code is ''grandson of ABACUS-2;'' it has, however, been written completely anew. Principal features include the ability to calculate to high partial waves (up to l = 800), refinement of integration meshes for large wave number, and a variety of forms for the optical potentials. The very superior Manchester Coulomb Wave Functions Routine, good in all parts of the (rho, eta) plane is used. This code, written in Fortran-extended, has been in use at Brookhaven on its CDC-7600 for the last two years, during which a number of minor improvements have been added. A general overview of the principal features of the code is given first, with some recommendations for input. This overview is intended to guide the user, and is not intended as a detailed description of the code. Then follow sections describing the input cards and the output generated by the code. These sections are sufficiently detailed to permit a user to prepare input without reference to a code listing. Finally, material necessary for writing special potential well subroutines and tables of control and parameter numbers are appended

  14. Life of a Tooth: A Visual Timeline

    Medline Plus

    Full Text Available ... friv Home InfoBites Find an AGD Dentist Your Family's Oral Health About the AGD Dental care and ... a Tooth Home | InfoBites | Find a Dentist | Your Family's Oral Health | RSS About AGD | Contact AGD | Site ...

  15. 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. Copyright © 2015 Elsevier Ltd. All rights reserved.

  16. 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…

  17. A Historical Perspective from "a" to "c"

    Science.gov (United States)

    Edwards, Thomas G.; Ozgun-Koca, S. Asli

    2010-01-01

    Evolving technology has played an important part in a common quadratic-function lesson. Having been mentioned repeatedly in numerous reform documents, a recurring lesson has involved changing the parameters in f(x) = ax[superscript 2] + bx + c and studying the effects on the graph. In both NCTM Yearbooks and NCTM Standards documents, technology is…

  18. 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...

  19. 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.

  20. 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…

  1. Life of a Tooth: A Visual Timeline

    Medline Plus

    Full Text Available ... June 1, 2018 About | Contact InfoBites Quick Reference Learn more Nutrition - Adults When Should My Child First See a Dentist? Check Menstrual Calendar for Tooth Extraction Temporomandibular Joint Disorder Men: Looking for a Better Job? Start by Visiting the Dentist Are You ...

  2. When Is a Mentor Like a Monk?

    Science.gov (United States)

    Gonzalez, Cristina

    2006-01-01

    The author of this article was particularly intrigued with an observation made in a paper written by one of her students in a graduate seminar on the philosophy of higher education. Most class members wrote about contemporary issues, but this student focused instead on mentoring in the medieval church. He reported that both the eastern and western…

  3. Life of a Tooth: A Visual Timeline

    Medline Plus

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

  4. 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

  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. Copyright © 2012 Elsevier Inc. All rights reserved.

  6. 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).

  7. A support shield for a powered support

    Energy Technology Data Exchange (ETDEWEB)

    Korczynski, P; Rojicek, P

    1982-08-31

    The subject of this invention is a support shield for a powered support. This shield resists creep of the coal from the longwall face, including an inclined longwall. It involves an arrangement wherein the distributor hinge is separated into upper and lower sections. The lower section holds a second hinge and the end of the rod of the pressure cylinder, one end of which is connected to the roof support. An advantage of the support is that compared to existing supports, it is self-advancing and holds stopes with coal which slopes in its formation or has inrushes. To a certain degree it prevents the stope space from ejecting fine pieces of rock from the longwall roof using an inter-timber support between the powered support and the stope. The support shield is moved by a simple system of levers which makes it possible, using a pressurized cylinder, to transmit a significant force to the coal stope. In this case, when the coal inrushes exceed the designed capabilities of the shield, a wooden extension piece is placed between the support and the face, through which the support pressure is applied.

  8. When a regulation becomes a learning process

    DEFF Research Database (Denmark)

    Nunez, Heilyn Camacho; Cespedes, Paula

    systems. It influences the business processes, and therefore a business practice should be redeveloped and redefined, furthermore the control over the ICT practice has become very important in the recent years. Some frameworks, methodologies and bodies of knowledge have been developed to support......, a small consulting company from Costa Rica, is using action learning to implement COBIT in the financial sector in Costa Rica....

  9. Nasopharyngeal Hemangiopericytoma in a Sudanese child: A ...

    African Journals Online (AJOL)

    These cells can be found surrounding all capillaries and are thought to be immature smooth muscle derived from mesenchyme. Pericytes add structural support to the capillaries and have a contractile capability playing a role in capillary blood flow regulation, modulating both flux and permeability1,3,4. Approximately 1% of ...

  10. 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.

  11. Are You a Man or a Mouse?

    DEFF Research Database (Denmark)

    Herrmann, Janne Rothmar

    2008-01-01

    by British researchers in applications to the British regulator, HFEA (the Human Fertilisation and Embryology Authority) sparked worldwide debate and controversy reflecting a fear that this type of research was a slippery slope towards creating actual beings that were part human and part animal...

  12. Urihi A: A Terra-Floresta Yanomami

    Directory of Open Access Journals (Sweden)

    James R. Welch

    2010-08-01

    Full Text Available Review of Urihi A: A Terra-Floresta Yanomami. Bruce Albert and William Milliken with Gale Goodwin Gomez. São Paulo: Instituto Socioambiental, 2009. 207 pp., illustrations, tables, bibliography, appendices, index. Paperback ISBN: 978‐85 85994‐72‐3.

  13. 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 ... dental words mean. The Life of a Tooth Home | InfoBites | Find a Dentist | Your Family's Oral Health | ...

  14. [A toddler with a mandibular fracture].

    Science.gov (United States)

    van der Linden, E L; Bun, R J; van Os, E

    2017-01-01

    Mandibular fractures are rare in children. Symptoms of these fractures include preauricular pain and swelling, trismus and pain when opening the mouth, and they are often preceded by a fall on the chin. If the diagnosis is missed they may have serious consequences for the growth and development of the jaw. A 3-year-old boy was referred with a swelling in his left cheek, fever and vomiting. Two days earlier he had fallen on his chin. At physical examination he had severe preauricular pain on palpation and a trismus. The patient was admitted because of suspicion of a viral parotitis and the threat of dehydration. After discharge, he went to the dentist for examination of a molar that was painful to the touch. The dentist performed an orthopantomogram and discovered a fracture of the left mandibular collum. Any child with trauma to the chin should be observed for symptoms of a mandibular fracture, and if it seems necessary non-invasive radiographic examination should be performed.

  15. 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...

  16. A historical vignette (20). A royal otitis.

    Science.gov (United States)

    Tainmont, J

    2010-01-01

    A royal otitis. The young king of France, Francis II, the eldest son of Henry II and Catherine de Medici, died in Orleans from the effects of the complications of a chronic otitis on 6 December 1560. Based on texts of the time, the paper discusses the nature of the illness, the treatment, and the medical and political entourage of the king.

  17. A tribute to James A. Holcombe

    Science.gov (United States)

    Sturgeon, Ralph

    2015-03-01

    My first interaction with Jim Holcombe was by letter in late 1977 (well before our instant e-mail communications age we all enjoy and/or curse). Jim was enquiring via some subtle questions about a paper I had recently published in Analytical Chemistry on the mechanisms of atomization in the graphite furnace. This brief correspondence initiated a 35 year period of technical interaction and friendship which literally carried us throughout the world to many conferences and more than a few shared hotel rooms in the days when one would make sacrifices to reduce travel costs to enable conference attendance. At the SciX 2013 (FACSS) meeting in Milwaukee WI, a special symposium was organized by John Molloy in honor of Jim's achievements. This was the closest "public" venue to correspond with Jim's announced 2013 spring retirement and his "exit" from a working career at the Department of Chemistry, University of Texas at Austin. It was a distinct honor for me to have Nicolo Omenetto ask if I would help coordinate this special issue of Spectrochim. Acta, Part B in honor of Jim's career/achievements. This gives me the opportunity to publicly comment on my personal association with this "Texas" gentleman from Colorado, a genuine "out of the box" thinker, a productive, highly acknowledged but humble character that I am grateful to have known, and with whom I have traveled the world and enjoyed so many good times.

  18. 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…

  19. 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

  20. Hepatitis A Vaccine

    Science.gov (United States)

    Twinrix® (as a combination product containing Hepatitis A Vaccine, Hepatitis B Vaccine) ... Why get vaccinated against hepatitis A?Hepatitis A is a serious liver disease. It is caused by the hepatitis A virus (HAV). HAV is spread from ...

  1. A Powerful Public Sphere?

    DEFF Research Database (Denmark)

    Fiig, Christina

    The paper holds a critical discussion of the Habermasian model of the public sphere and proposes a revised model of a general public......The paper holds a critical discussion of the Habermasian model of the public sphere and proposes a revised model of a general public...

  2. 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.

  3. A multiplicity trigger for a Cherenkov detector

    International Nuclear Information System (INIS)

    Jonsson, P.

    1984-05-01

    The Multiplicity Trigger (MT) is a device for deciding if, in a given time window, the number of wires that are hit in a multi wire proportional chamber (MWPC) is within given limits. The MT is designed for a Cherenkov detector, using a MWPC with 155 sense wires. It has ten inputs with sixteen channels on each, for 160 ECL input signals from the MWPC. With the MT, it is possible to decide if the number of hits is greater than n out of 160, where n is called the multiplicity. Here, 2 < n < 30, with an accuracy of +- 1. The time window can be adjusted from 0.7 to 4 μs. The MT has four separate NIM outputs, to make it possible to have four different values of n at the same time. The propagation delay from input to output is at the most 100 ns. (author)

  4. PLANT PATHOLOGY: a discipline at a crossroads.

    Science.gov (United States)

    Weinhold, A R

    1996-01-01

    The Department of Plant Pathology at the University of California at Berkeley was destroyed as a consequence of a contentious reorganization. The circumstances that led to the reorganization provide some insight into the challenges facing the discipline of plant pathology. The underlying basis for plant pathology as a science is to address problems of plant disease. This requires a balance between disciplinary and problem-solving research and a continuum from achieving fundamental advances in knowledge to the development and implementation of problem-solving approaches. Changes in colleges and universities have placed extreme stress on this essential structure. The dilemma that must be addressed is how to reestablish the problem-solving continuum where it has been broken and strengthen it where it has been weakened. Plants are essential for life, and they will always be affected by disease. The understanding and management of these diseases is the responsibility and the challenge of plant pathology today and in the future.

  5. A model for a stable coronal loop

    International Nuclear Information System (INIS)

    Hoven, G.V.; Chiuderi, C.; Giachetti, R.

    1977-01-01

    We present here a new plasma-physics model of a stable active-region arch which corresponds to the structure observed in the EUV. Pressure gradients are seen, so that the equilibrium magnetic field must depart from the force-free form valid in the surrounding corona. We take advantage of the data and of the approximate cylindrical symmetry to develop a modified form of the commonly assumed sheared-spiral structure. The dynamic MHD behavior of this new pressure/field model is then evaluated by the Newcomb criterion, taken from controlled-fusion physics, and the results show short-wavelength stability in a specific parameter range. Thus we demonstrate the possibility, for pressure profiles with widths of the order of the magnetic-field scale, that such arches can persist for reasonable periods. Finally, the spatial proportions and magnetic fields of a characteristic stable coronal loop are described

  6. Hadron production in A A collisions

    International Nuclear Information System (INIS)

    Stroebele, Herbert

    1996-01-01

    This contribution covers hadron production in collisions between nuclei in the laboratory energy range from a few hundred MeV/nucleon, where pion production starts to play a non negligible role, to a few hundred GeV/nucleon, still below the region where jets come into play. Only hadron production by the strong interaction process is considered. The main emphasis will be on π- and K-mesons. Hyperons and antibaryons will be mentioned at the highest energy only. In this presentation only a small part of the huge field of hadronic particle production in a wide beam energy interval can be dealt with. The author's choice of experimental data should be considered to represent his field of interest and activity. (author)

  7. 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...... considered three museum galleries—each with the same artist’s paintings and basic layout; the only major difference being design elements within one space encouraging social interaction and in turn causing repressed enjoyment, negative emotional experience and negative art evaluation. We use this example...... as a frame for introducing a model of the psychological impact of social interaction on the behavioral and cognitive experience of art, considering its implications for education—which often focuses on the social—as well as implications for personal or introspective art engagement. We also consider a number...

  8. A case of a massive mandibular schwannoma

    Directory of Open Access Journals (Sweden)

    Shishir Ram Shetty

    2011-01-01

    Full Text Available Schwannoma, a benign nerve sheath tumor is relatively rare in occurrence and even rarer in sites, such as jaw bones. There are only 45 reported cases of intraosseous schwannoma of the jaws reported in the literature. We report a rare case of mandibular schwannoma in a 50-year-old Indian male. The clinical features resembled that of a residual cyst, fibro-osseous lesion or an odontogenic tumor/cyst. Radiological differential diagnoses of ameloblastoma or odontogenic keratocyst was made based on the findings of the orthopantomogram. The lesion was examined histopathologically and a final diagnosis of schwannoma arising from the inferior alveolar nerve was made. The aim of this report is to add information to the existing sparse literature on intraosseous schwannomas of the jaw.

  9. 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...

  10. 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.

  11. Workplace spirituality: A tool or a trend?

    Directory of Open Access Journals (Sweden)

    Philip J.W. Schutte

    2016-08-01

    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.

  12. A view to a (staged) kill?

    DEFF Research Database (Denmark)

    Gamborg, Christian; Jensen, Frank Søndergaard; Sandøe, Peter

    2015-01-01

    Is it acceptable, in principle, to shoot wild animals as a sport? The ethical controversy around recreational hunting is not only of academic interest but plays an important role in public and political discussions concerning the legitimacy of hunting. For the hunter, hunting is typically imbued...... with a perception of deeper meaning. For ardent non-hunters it may be hard to understand the meaning of enjoying nature by shooting at other living beings. This lack of mutual understanding makes it difficult to create a dialogue. However, the issue is not just about whether or not to accept hunting but also......-based questionnaires) of different Danish stakeholders. Results show that a majority of the general public is primarily against the practice; a majority of hunters are pro, and landowners somewhere in between. Reasons may be found in relation to views on wildlife, naturalness and what constitutes ‘proper’ hunting...

  13. 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 five...... years. Although further improvements are necessary before the technology can be commercialized. Researchers were mainly focused on the development of materials and optimization of a flow system in order to increase the efficiency of magnetic heat pumps. The project, presented in this paper, is devoted...... to the improvement of heat pump and cooling technologies through simple tests of prospective regenerator designs. A brief literature review and expected results are presented in the paper. It is mainly focused on MCE technologies and provides a brief introduction to the magnetic cooling as an alternative...

  14. 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

  15. Controlling a nuclear spin in a nanodiamond

    Science.gov (United States)

    Knowles, Helena S.; Kara, Dhiren M.; Atatüre, Mete

    2017-09-01

    The sensing capability of a single optically bright electronic spin in diamond can be enhanced by making use of proximal dark nuclei as ancillary spins. Such systems, so far realized only in bulk diamond, can provide orders of magnitude higher sensitivity and spectral resolution in the case of magnetic sensing, as well as improved readout fidelity and state storage time in quantum information schemes. Nanodiamonds offer opportunities for scanning and embedded nanoscale probes, yet electronic-nuclear spin complexes have so far remained inaccessible. Here, we demonstrate coherent control of a 13C nuclear spin located 4 Å from a nitrogen-vacancy center in a nanodiamond and show coherent exchange between the two components of this hybrid spin system. We extract a free precession time T2* of 26 μ s for the nuclear spin, which exceeds the bare-electron free-precession time in nanodiamond by two orders of magnitude.

  16. A Cloze Is a Cloze Is a Cloze?

    Science.gov (United States)

    Brown, James Dean

    This study attempted to determine the effectiveness of cloze procedures as norm-referenced instruments by comparing the differential responses of four groups of college students of English as a second language on two identical cloze passages. The responses were scored using both exact-answer and acceptable-word methods. The results indicate that…

  17. On Human Communication: A Review, a Survey, and a Criticism.

    Science.gov (United States)

    Cherry, Colin

    This book, uniting the material from numerous lectures on communication theory, is designed to serve as the introduction to a series entitled "Studies in Communication," which will appear during the next few years. It is not intended for the expert in each of the many fields related to human communication, but, rather, it is designed for the…

  18. 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…

  19. A box of mirrors, a unicorn, and a pony

    Directory of Open Access Journals (Sweden)

    Jules Wilkinson

    2010-03-01

    Full Text Available Fans and creators have traditionally treated fanworks with a "don't ask, don't tell" policy. However, Supernatural incorporates fans and their creative works into the show itself, changing the status quo of the fan/creator relationship.

  20. Entre a literatura e a filosofia: a intertextualidade nassariana

    Directory of Open Access Journals (Sweden)

    Maria Aparecida Antunes de Macedo

    2009-01-01

    Full Text Available O romance Lavoura arcaica, de Raduan Nassar, insere-se nas tendências dapós-modernidade filosófica e do pós-modernismo artístico, na medida em quenele se encontra uma poética intertextual apontando tanto para a crítica à razãouniversal do Iluminismo quanto para a problematização do homem no discurso– aspectos centrais nas teorias pós-modernas. Em Cadernos de literaturabrasileira: Raduan Nassar, o escritor situa sua poética na flutuação de doisdomínios do conhecimento, que são a literatura e a filosofia – esta última sendogeradora de seu trabalho intertextual. Em seu texto ficcional, entrevemos essapoética nos comentários autoteorizantes efetuados pelo narrador, em suaaproximação paralela à crítica da pós-modernidade.

  1. 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...

  2. A NEW CONTRACT ON EDUCATION? - A HISTORY OF A PROCESS

    Directory of Open Access Journals (Sweden)

    Manuel de Puelles Benítez

    2010-05-01

    After locating the contract on education in its historical and political background, this article reveals its meaning throughout time since the 1978 Spanish Constitution came in force, while, at the same time, it takes a practical outlook on the reasons why it is necessary and why it recently failed to be.

  3. 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

  4. A device, a system and a method of encoding a position of an object

    DEFF Research Database (Denmark)

    2012-01-01

    The present invention relates to a device for encoding a position of an object, comprising a first light source; a first collimating element adapted to form first collimated light from the first light source; a carrier adapted to guide light and comprising a first primary light redirecting...... structure and a second primary light redirecting structure; and a detector device for encoding the position of an object with respect to an active area of an encoding plane; wherein the first primary light redirecting structure is adapted to redirect at least a part of a first light beam through the active...

  5. 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

  6. Bladder necrosis: 'A man without a bladder'.

    Science.gov (United States)

    Bosschieter, Judith; Oudshoorn, Frederik H K; Meuleman, Eric J H; Nieuwenhuijzen, Jakko A

    2018-02-17

    Since the use of antibiotics, bladder necrosis has become a rare condition. We report a case of bladder necrosis in a 90-year-old man following urinary retention. After insertion of a transurethral catheter (TUC), 2 L of urine was evacuated. In the following days, the TUC became intermittently blocked. Adequate bladder drainage could not be obtained despite intensive rinsing and placement of a suprapubic catheter. On surgical exploration necrosis of almost the entire bladder wall, except for the trigone, was encountered. Surgical debridement of the non-viable bladder wall without opening the abdominal cavity was conducted, and a TUC was placed in the Retzius cavity to ensure evacuation of urine. Since the patient was haemodynamically unstable, construction of a urinary diversion was waived and urinary drainage of the Retzius cavity by the TUC was accepted, resulting in adequate urinary drainage without compromising renal function. © BMJ Publishing Group Ltd (unless otherwise stated in the text of the article) 2018. All rights reserved. No commercial use is permitted unless otherwise expressly granted.

  7. [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.

  8. A sun holiday is a sunburn holiday.

    Science.gov (United States)

    Petersen, Bibi; Thieden, Elisabeth; Philipsen, Peter Alshede; Heydenreich, Jakob; Young, Antony Richard; Wulf, Hans Christian

    2013-08-01

    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 by daily skin examinations by the same observer. Erythemally effective ultraviolet radiation (UVR) exposure was assessed with time-stamped personal dosimeters worn on the wrist. Volunteers reported their clothing cover and sunscreen use in diaries, and this information was used to determine body site-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 clearly support a substantial skin cancer risk from sun holidays. © 2013 John Wiley & Sons A/S. Published by John Wiley & Sons Ltd.

  9. Grasshoppers as a food source? A review

    Directory of Open Access Journals (Sweden)

    Paul, A.

    2016-01-01

    Full Text Available Description of the subject. Current trends suggest an increasing future demand for conventional meats, which indicates a strong need to shift this dependency to other alternative protein sources such as insects. Literature. From a nutritional point of view, of all the insects consumed globally, grasshoppers are particularly important as a human food. Data from the literature regarding the nutrient composition, amino acid profile, fatty acid profile, mineral composition and vitamin content of grasshoppers as reviewed in this paper, suggest that a number of grasshopper species are a good source of nutrients. It also highlights some of the health related aspects that might arise from the consumption of grasshoppers, mostly linked to agricultural practices and the allergic response of sensitive individuals. The paper also summarizes some religious, social and economic factors that are associated with grasshopper consumption. Conclusions. The success of introducing grasshoppers as a novel food in western countries depends on changes in consumer attitudes. It would be interesting to develop food products derived from grasshoppers in a form acceptable to consumers. Furthermore, it is important to explore the food potential of some grasshopper species native to western countries and to develop their rearing methodologies to enhance availability.

  10. 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.

  11. Ventana a la Farmacología

    Directory of Open Access Journals (Sweden)

    María Luisa Cárdenas Muñoz

    1996-04-01

    Full Text Available Terfenadina: no debe usarse con eritromicina: La terfenadina es un antihistamínico de segunda generación, cuyo uso se ha generalizado por producir menos sedación que los antihistamínicos de primera generación.  / Uso y abuso de corticoides tópicos oculares: A finales de la década de los cuarenta Kench y Kendall introdujeron la cortisona en la terapéutica humana, simultáneamente comenzó a ser utilizada con éxito en las inflamaciones oculares. /  Trastornos de pánico: pato fisiología y tratamiento: El tratamiento farmacológico del pánico se conoce y utiliza desde los años sesenta. Sinembargo, la comprensión del origen biológico de su pato fisiología sólo se comenzó a entender en años recientes. / Acido Acetil Salicilico y riesgo de Cancer Colorecal en mujeres: Evidencias muy importantes sugieren que el uso regular de ácido acetil salicílico (ASA y otros antiinflamatorios no esteroideos (AINE disminuye el riesgo de cáncer colorectal.

  12. 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...

  13. SUPERCOLLIDER: A GEM of a detector

    International Nuclear Information System (INIS)

    Anon.

    1993-01-01

    Now being prepared as a major experimental facility for the 87- kilometre Superconducting Supercollider (SSC) being built in Ellis County, Texas, is the GEM detector project. GEM thus becomes the companion to the Solenoidal Detector Collaboration (SDC), the first major SSC detector to emerge (March 1992, page 13). This is in keeping with the SSC Laboratory's aim of two major detectors with overlapping and complementary strengths. GEM is designed to observe all SSC signatures, with emphasis on precise measurement of electrons, photons and muons. Hence the name GEM - ''Gammas, Electrons and Muons.'' Design goals are clean signatures for leptons, jets, and missing transverse energy, maximum sensitivity to narrow resonances, and low backgrounds. Also important is maintaining significant capability at high luminosity (10 34 cm -2 s -1 ). GEM has some distinctive features. A key concept is the exterior magnet, surrounding all detector elements. Inside the magnet are a muon tracking system, a precision calorimeter, and a compact central tracker. This allows the muon momentum to be measured the air of the radiation shielded area outside the thick calorimeter, giving both high precision and robustness at high luminosity. A large magnet gives a large lever arm (at least 4 m) for precise muon momentum measurement. Placing the magnet outside also minimizes the material between tracker and calorimeters, so that the calorimeters are limited only by their inherent resolutions

  14. ViA: a perceptual visualization assistant

    Science.gov (United States)

    Healey, Chris G.; St. Amant, Robert; Elhaddad, Mahmoud S.

    2000-05-01

    This paper describes an automated visualized assistant called ViA. ViA is designed to help users construct perceptually optical visualizations to represent, explore, and analyze large, complex, multidimensional datasets. We have approached this problem by studying what is known about the control of human visual attention. By harnessing the low-level human visual system, we can support our dual goals of rapid and accurate visualization. Perceptual guidelines that we have built using psychophysical experiments form the basis for ViA. ViA uses modified mixed-initiative planning algorithms from artificial intelligence to search of perceptually optical data attribute to visual feature mappings. Our perceptual guidelines are integrated into evaluation engines that provide evaluation weights for a given data-feature mapping, and hints on how that mapping might be improved. ViA begins by asking users a set of simple questions about their dataset and the analysis tasks they want to perform. Answers to these questions are used in combination with the evaluation engines to identify and intelligently pursue promising data-feature mappings. The result is an automatically-generated set of mappings that are perceptually salient, but that also respect the context of the dataset and users' preferences about how they want to visualize their data.

  15. Hyponatremia in a Teenager: A Rare Diagnosis.

    Science.gov (United States)

    Correia, Filipa; Fernandes, Alexandre; Mota, Teresa C; Garcia, Milagros; Castro-Correia, Cíntia; Fontoura, Manuel; Ribeiro, Augusto

    2015-12-01

    Hyponatremia is a common electrolyte alteration which has the potential for significant morbidity and mortality. Endocrine disorders, such as primary hypothyroidism and adrenal insufficiency are uncommon causes of hyponatremia. We present the case of a teenager with symptomatic hyponatremia caused by a rare disorder. A 17-year-old boy was admitted to the emergency department with abdominal pain, nausea and vomiting, asthenia, and weight loss. He was in poor general condition, hypotensive, and he had dry mucous membranes and skin as well as mucosa hyperpigmentation. The laboratory findings showed severe hyponatremia, hyperkalemia, and renal dysfunction. The patient started inotropic support and antibiotics. Plasma cortisol and corticotropin levels allowed the diagnosis of primary adrenal insufficiency. He began replacement therapy with hydrocortisone and fludrocortisone, with gradual symptom resolution. An abdominal computed tomography scan showed adrenal hypoplasia. Findings for antiadrenal and antithyroid antibodies were positive, allowing the diagnosis of autoimmune polyglandular syndrome type II. Adrenal insufficiency is a rare disease, especially in children, and its clinical manifestations are due to glucocorticoid and mineralocorticoid deficiency. In most of the cases, symptoms are nonspecific, requiring a high index of clinical suspicion. If the diagnosis and treatment are delayed, acute adrenal insufficiency carries a high morbidity and mortality.

  16. [A quest for a new superconducting state

    International Nuclear Information System (INIS)

    Collman, J.P.; Little, W.A.

    1993-01-01

    The authors report on progress of work for the past twelve months, and the work which is planned for the coming year. They have been working on the theory of the long range proximity effect discovered experimentally on Bi-Ag-Tl(2223) sandwiches during the period of the previous grant. This has led to the prediction of a novel effect which they refer to as a ''pair echo'' which occurs in these sandwiches and is analogous to the familiar ''spin echo'' seen in certain NMR experiments. Experimentally, they have extended the measurements of the proximity effect to lower temperatures and to other superconductors. They have completed high resolution studies of the thermal difference optical reflectance of the high T c superconductor Tl(2223), for temperatures both above and below the transition temperature, over a photon energy range from 0.3 eV to 5.3 eV. A striking anomaly in this thermal difference spectrum has been found near 1.6 eV, which appears below T c and scales in magnitude with temperature like Δ(T) 2 where Δ(T) is a BCS gap. This is precisely the kind of effect which they had hoped to find, based on a Holstein-like mechanism in these materials, and which they had predicted in a paper on ''Gap Modulation''. The proper interpretation of the effect observed should reveal the mechanism responsible for the superconductivity of the cuprates. They have completed a search for the, so-called Zhang-modes in the above high T c superconductor, Tl(2223) over the same energy range, 0.3 eV to 5.3 eV. These modes are predicted to exist if the proper description of the ground state of the system is that of a Hubbard model

  17. A vibration sieve

    Energy Technology Data Exchange (ETDEWEB)

    Alekhin, S.A.; Denisenko, V.V.; Dzhalalov, M.G.; Kirichek, F.P.; Pitatel, Yu.A.; Prokopov, L.I.; Tikhonov, Yu.P.

    1982-01-01

    A vibration sieve is proposed which includes a vibration drive, a body and a screen installed on shock absorbers, a device for washing out the screen, and a subassembly for loading the material. To increase the operational reliability and effectiveness of the vibration sieve by improving the cleaning of the screen, the loading subassembly is equipped with a baffle with a lever which is hinged to it. The device for washing out the screen is made in the form of an electromagnet with a connecting rod, a switch and an eccentric, a friction ratchet mechanism and sprinkling systems. Here, the latter are interconnected, using a connecting rod, while the sprinkling system is installed on rollers under the screen. The electromagnetic switch is installed under the lever. The body is made with grooves for installing the sprinkling system. The vibration sieve is equipped with a switch which interacts with the connecting rod. The friction ratchet mechanism is equipped with a lug.

  18. 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.

  19. 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.

  20. Cosmic strings: A problem or a solution?

    International Nuclear Information System (INIS)

    Bennett, D.P.; Bouchet, F.R.

    1987-10-01

    The most fundamental issue in the theory of cosmic strings is addressed by means of Numerical Simulations: the existence of a scaling solution. The resolution of this question will determine whether cosmic strings can form the basis of an attractive theory of galaxy formation or prove to be a cosmological disaster like magnetic monopoles or domain walls. After a brief discussion of our numerical technique, results are presented which, though still preliminary, offer the best support to date of this scaling hypothesis. 6 refs., 2 figs

  1. A case report of a pulmonary abscess

    Directory of Open Access Journals (Sweden)

    Tatiana Fonseca

    2017-03-01

    We describe a case of a 34 year-old, male, with history of lung adenocarcinoma and distal esophagus adenocarcinoma. Was surgically proposed to eso-gastrectomy and eso-gastrostomy. Due the partial dehiscence of the anastomosis, it was placed an endoluminal prosthesis. Three weeks later, it was found an esophageal orifice and a pulmonary abscess due carbapenem resistant klebsiella pneumoniae. He was started on tigecycline, colistine and amphotericin B. However, there wasn’t any improvement, and the patient died on 45th day of his admission. Discussion: Timely microbiological diagnosis, the use of new and old antibiotics and cirurgical intervention appeared to be valuable in managing of this patients.

  2. A surprising palmar nevus: A case report

    Directory of Open Access Journals (Sweden)

    Rana Rafiei

    2018-02-01

    Full Text Available Raised palmar or plantar nevus especially in white people is an unusual feature. We present an uncommon palmar compound nevus in a 26-year-old woman with a large diameter (6 mm which had a collaret-shaped margin. In histopathologic evaluation intralymphatic protrusions of nevic nests were noted. This case was surprising to us for these reasons: size, shape, location and histopathology of the lesion. Palmar nevi are usually junctional (flat and below 3 mm diameter and intra lymphatic protrusion or invasion in nevi is an extremely rare phenomenon.

  3. 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...

  4. 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...

  5. A School Day is a School Day

    DEFF Research Database (Denmark)

    Engelhardt, Robin

    2007-01-01

    Life of Science, edited by Lykke Margot Ricard and Robin Engelhardt. Learning Lab Denmark, Copenhagen, pages 7-13. 2003 Short description: The school Sint-Jozef-Klein-Seminarie in the Flemish town of Sint-Niklaas reveals a school system characterised by hard work, solicitude and tradition. Abstract......: Compared with the French communities, where many children have to repeat a year if they fail the tests, the children in the Flemish communities get a lot of help if they risk failing. In the beginning of the first school year, the students can do their homework in the school together with their own classes...

  6. Education of a college president: a memoir

    International Nuclear Information System (INIS)

    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

  7. 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

  8. Ventana a la Farmacología

    OpenAIRE

    María Luisa Cárdenas Muñoz; Hernán Pérez; Ramiro Prada Reyes

    1996-01-01

    Terfenadina: no debe usarse con eritromicina: La terfenadina es un antihistamínico de segunda generación, cuyo uso se ha generalizado por producir menos sedación que los antihistamínicos de primera generación.  / Uso y abuso de corticoides tópicos oculares: A finales de la década de los cuarenta Kench y Kendall introdujeron la cortisona en la terapéutica humana, simultáneamente comenzó a ser utilizada con éxito en las inflamaciones oculares. /  Trastornos de pánico: pato fisiología y tratamie...

  9. A gyrovirus infecting a sea bird

    Science.gov (United States)

    Li, Linlin; Pesavento, Patricia A.; Gaynor, Anne M.; Duerr, Rebecca S.; Phan, Tung Gia; Zhang, Wen; Deng, Xutao

    2015-01-01

    We characterized the genome of a highly divergent gyrovirus (GyV8) in the spleen and uropygial gland tissues of a diseased northern fulmar (Fulmarus glacialis), a pelagic bird beached in San Francisco, California. No other exogenous viral sequences could be identified using viral metagenomics. The small circular DNA genome shared no significant nucleotide sequence identity, and only 38–42 % amino acid sequence identity in VP1, with any of the previously identified gyroviruses. GyV8 is the first member of the third major phylogenetic clade of this viral genus and the first gyrovirus detected in an avian species other than chicken. PMID:26036564

  10. 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.

  11. A seizuring alagille syndrome

    Directory of Open Access Journals (Sweden)

    Jomon Mathew John

    2017-01-01

    Full Text Available Alagille syndrome is a rare autosomal dominant inherited disorder with incidence of one in 100,000 live births. This syndrome with seizure as a presentation has been rarely reported in Indian studies. We present a 3-month-old infant who presented to us with seizures was found to have a dysmorphic face, jaundice, hepatomegaly, and soft systolic murmur. Infant was stabilized and remained seizure free. A detailed clinical evaluation of a common presentation may reveal a rare syndrome.

  12. 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.

  13. Propaganda: Can a Word Decide a War?

    National Research Council Canada - National Science Library

    Murphy, Dennis M; White, James F

    2007-01-01

    .... The mainstream American press, members of Congress, and other government leaders immediately and loudly condemned these actions as "propaganda" and contrary to the democratic ideals of a free press...

  14. A spacetime cloak, or a history editor

    Science.gov (United States)

    McCall, Martin W.; Favaro, Alberto; Kinsler, Paul; Boardman, Allan

    2011-02-01

    We introduce a new type of electromagnetic cloak, the spacetime cloak (STC), which conceals events rather than objects. Non-emitting events occurring during a restricted period are never suspected by a distant observer. The cloak works by locally manipulating the speed of light of an initially uniform light distribution, whilst the light rays themselves always follow straight paths. Any 'perfect' spacetime cloak would necessarily rely upon the technology of electromagnetic metamaterials, which has already been shown to be capable of deforming light in ways hitherto unforeseen—to produce, for example, an electromagnetic object cloak. Nevertheless, we show how it is possible to use intensity-dependent refractive indices to construct an approximate STC, an implementation that would enable the distinct signature of successful event cloaking to be observed. Potential demonstrations include systems that apparently violate quantum statistics, 'interrupt-without-interrupt' computation on convergent data channels and the illusion of a Star Trek transporter.

  15. A certified private practice - a report

    International Nuclear Information System (INIS)

    Boehm, J.

    2005-01-01

    Based on the requirements for internal quality assurance in our private practice a model for quality management was implemented. Using such a quality management system (QM-system) resulted in a systematic optimization and higher quality of operating procedures in all work areas. The realization of the new QM-system led to a higher transparency, improved economical efficiency, and an increase in personal motivation. Internal frictional losses could be effectively reduced saving time and money. The efforts in time, costs and personal resources during implementation of the QM-system, which had been considered as downsides in the beginning, are outweighed by the benefits by far according to our experience. In summary: ''We consider it worthwhile in all respects''. (orig.)

  16. PNEUMOCONIOSIS IN A SPOONBILL - A CASE REPORT

    Directory of Open Access Journals (Sweden)

    Shivaji Bhattacharya

    2013-12-01

    Full Text Available Pneumoconiosis has been identified in an adult dead spoonbill (Platalea leucorodia from a Zoo in Kolkata, West Bengal, India. An environmental automobile pollutants present around that ambient may be the cause of pneumoconiosis.

  17. 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 ... Menstrual Calendar for Tooth Extraction Learn what those dental words mean. The Life of a Tooth Home | ...

  18. What Is a Pinguecula and a Pterygium?

    Science.gov (United States)

    ... a combination of dry eyes and exposure to wind, dust, and ultraviolet (UV) light from the sun. ... EyeWiki International Society of Refractive Surgery * Required * First Name: * Last Name: Member ID: * Phone Number: * Email: * Enter ...

  19. [Mindfulness, a therapy and a life philosophy].

    Science.gov (United States)

    Manuel Da Rocha, Stéphanie

    2016-04-01

    Mindfulness is an approach inspired by Buddhist meditation. Recent scientific research shows that focusing on the present is a factor of care. Copyright © 2016 Elsevier Masson SAS. All rights reserved.

  20. 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.

  1. 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.

  2. When Is a Program Like a Function?

    Science.gov (United States)

    Klotz, Frederic S.

    1986-01-01

    Functional programming, in which the connection to mathematics is simple and direct, is described. A language such as Logo illustrates the relationship between functional programming and mathematics in more detail. (MNS)

  3. A spacetime cloak, or a history editor

    International Nuclear Information System (INIS)

    McCall, Martin W; Favaro, Alberto; Kinsler, Paul; Boardman, Allan

    2011-01-01

    We introduce a new type of electromagnetic cloak, the spacetime cloak (STC), which conceals events rather than objects. Non-emitting events occurring during a restricted period are never suspected by a distant observer. The cloak works by locally manipulating the speed of light of an initially uniform light distribution, whilst the light rays themselves always follow straight paths. Any 'perfect' spacetime cloak would necessarily rely upon the technology of electromagnetic metamaterials, which has already been shown to be capable of deforming light in ways hitherto unforeseen—to produce, for example, an electromagnetic object cloak. Nevertheless, we show how it is possible to use intensity-dependent refractive indices to construct an approximate STC, an implementation that would enable the distinct signature of successful event cloaking to be observed. Potential demonstrations include systems that apparently violate quantum statistics, 'interrupt-without-interrupt' computation on convergent data channels and the illusion of a Star Trek transporter

  4. A wonderful laboratory and a great researcher

    Science.gov (United States)

    Sheikh, N. M.

    2004-05-01

    It was great to be associated with Prof. Dr. Karl Rawer. He devoted his life to make use of the wonderful laboratory of Nature, the Ionosphere. Through acquisition of the experimental data from AEROS satellites and embedding it with data from ground stations, it was possible to achieve a better empirical model, the International Reference Ionosphere. Prof. Dr. Karl Rawer has been as dynamic as the Ionosphere. His vision about the ionospheric data is exceptional and has helped the scientific and engineering community to make use of his vision in advancing the dimensions of empirical modelling. As a human being, Prof. Dr. Karl Rawer has all the traits of an angel from Heaven. In short he developed a large team of researchers forming a blooming tree from the parent node. Ionosphere still plays an important role in over the horizon HF Radar and GPs satellite data reduction.

  5. Life of a Tooth: A Visual Timeline

    Medline Plus

    Full Text Available ... Is My Child at Risk for Early Childhood Tooth Decay? What is a Composite Resin (White Filling)? How Do I Care for My Child's Baby Teeth? Learn what those dental words mean. The Life ...

  6. Zassenhaus conjecture for A6 A6 A6

    Indian Academy of Sciences (India)

    (ZC1) For a finite group G, every torsion unit in its integral group ring ZG is conjugate to an element of ±G in the units of the rational group algebra QG. ... version of the Luthar–Passi method were shown in [2]. ... Of course, we ..... [2] Bovdi V, Höfert C and Kimmerle W, On the first Zassenhaus conjecture for integral group rings ...

  7. Identifying a base in a nucleic acid

    Science.gov (United States)

    Fodor, Stephen P. A.; Lipshutz, Robert J.; Huang, Xiaohua

    2005-02-08

    Devices and techniques for hybridization of nucleic acids and for determining the sequence of nucleic acids. Arrays of nucleic acids are formed by techniques, preferably high resolution, light-directed techniques. Positions of hybridization of a target nucleic acid are determined by, e.g., epifluorescence microscopy. Devices and techniques are proposed to determine the sequence of a target nucleic acid more efficiently and more quickly through such synthesis and detection techniques.

  8. A note on a functional inequality

    Directory of Open Access Journals (Sweden)

    Horst Alzer

    1992-01-01

    Full Text Available We prove: If r1,…,rk are (fixed positive real numbers with ∏j=1krj>1, then the only entire solutions φ:ℂ→ℂ of the functional inequality∏j=1k|φ(rjz|≥(∏j=1krj|φ(z|kare φ(z=czn, where c is a complex number and n is a positive integer.

  9. Transvestism as a Symptom: A Case Series

    OpenAIRE

    Anupama, M.; Gangadhar, K. H.; Shetty, Vandana B.; Dip, P. Bhadja

    2016-01-01

    Transvestism, commonly termed as cross-dressing, means to dress in the clothing of opposite sex. We describe a series of three cases with transvestism as one of their primary complaints. The discussion sheds light on the various ways in which transvestism as a symptom can present in Psychiatry. In the first two cases, there was lower intelligence. In first and third case, there were other paraphilia along with transvestism. Second case had co-morbid obsessive-compulsive disorder (OCD) and had...

  10. 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.......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....

  11. 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.

  12. Ventana a la farmacología

    Directory of Open Access Journals (Sweden)

    Facultad de Medicina Revista

    1994-07-01

    Full Text Available 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?

  13. A look back and a look forward

    International Nuclear Information System (INIS)

    McDonald, J. C.

    2012-01-01

    Roman mythology described Janus as the god of beginnings and transitions. Janus was depicted as having two heads facing in opposite directions that could be thought of as the future and the past. Therefore, it is altogether appropriate that the first month of our calendar should be named after Janus because it is a time of passage from the old to the new year. There were a number of significant events and developments during the past year, and one can look forward to a number of new and, perhaps, unexpected developments during the year to come. The year 2011 saw the tragedy of a major earthquake and Tsunami in Japan resulting in a disastrous series of explosions at the Fukushima I Nuclear Power Plant. Releases of radionuclides to the atmosphere and depositions in the immediate vicinity of the plant have required remediation efforts on the part of the Japanese government, with help from a number of other nations. This accident was classified as Level 7, the highest level, on the International Nuclear Event Scale. (author)

  14. 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’.

  15. 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.

  16. 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

  17. A nuclear proportional counter

    International Nuclear Information System (INIS)

    1973-01-01

    The invention relates to a nuclear proportional counter comprising in a bulb filled with a low-pressure gas, a wire forming an anode and a cathode, characterized in that said cathode is constituted by two plane plates parallel to each other and to the anode wire, and in that two branches of a circuit are connected to the anode wire end-portions, each branch comprising a pre-amplifier, a measuring circuit consisting of a differentiator-integrator-differentiator amplifier and a zero detector, one of the branches comprising an adjustable delay circuit, both branches jointly attacking a conversion circuit for converting the pulse duration into amplitudes said conversion circuit being followed by a multi-channel analyzer, contingently provided with a recorder [fr

  18. Dial-a-Ride

    DEFF Research Database (Denmark)

    Jørgensen, Rene Munk

    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 time windows at the stops are then calculated by the operator based on additional parameters such as maximum...... to the problem. The metod used in this thesis is based on a clustering first insertion second technique developed at CRT in Canada in the mid 1980's. The algorithm is extended to include constraints imposed by a practical Dial-a-Ride problem at a Danish transportation operator. These constraints are mainly...

  19. [A zoocentric Capgras syndrome].

    Science.gov (United States)

    Ehrt, U

    1999-01-01

    Capgras syndrome is a delusional misidentification, a phenomenon where a person believes delusionally that another person (in most cases closely related) has been replaced by a double or impostor of identical appearance. It is usually a symptom of a functional psychosis but sometimes it is also associated with organic cerebral dysfunction. We present a case of a 23-year old women who had the delusional belief that her cat had been replaced by the cat of her former boy-friend. Reviewing the literature we found that such a case is very rare. The association between Capgras syndrome and depersonalisation-derealisation phenomena is also pointed out.

  20. 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

  1. 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,…

  2. 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…

  3. Without a Voice

    Science.gov (United States)

    Pennamacoor, Carol

    2007-01-01

    Selective Mutism (SM), normally discovered at a young age, is a selective anxiety disorder in which a child demonstrates a persistent lack of speech in one or more social settings, notably in school, despite his or her ability to speak comfortably at home. In this article, the author presents Betsy, a child who was diagnosed with SM and was helped…

  4. Taking a Long View

    DEFF Research Database (Denmark)

    Ougaard, Morten

    a global perspective which leads to a more positive assessment. I will do this from a historical materialist perspective and therefore I begin with a discussion of the long view in Marx. This leads on to a discussion of Marx’s law of the long term declining rate of profit (LTFRP) and its counteracting...

  5. A Polarizing View

    Science.gov (United States)

    Bernard, Rachel; Henegan, Colleen

    2018-01-01

    For many students, the first--and sometimes only--chance to look through a microscope is in high school biology class, where they observe plant and animal cells up close. Even in college, few students use a microscope for a subject other than biology. Thus, it can be a surprise to learn that microscopes are a primary tool used to understand the…

  6. A Chinese Tongue Twister

    Science.gov (United States)

    Hilton, John

    2014-01-01

    When John Hilton was pursuing a master's in education, he took a very influential class from Eleanor Duckworth. She frequently taught and reinforced a concept to the class: "It is very important for teachers to have a chance to watch themselves learn." So when Hilton was hired to teach literature as a college professor, he thought…

  7. Impedance of a nanoantenna

    International Nuclear Information System (INIS)

    Greffet, Jean-Jacques; Laroche, Marine; Marquier, Francois

    2009-01-01

    We introduce a generalized definition of the impedance of a nanoantenna that can be applied to any system. We also introduce a definition of the impedance of a two level system. Using this framework, we establish a link between the electrical engineering and the quantum optics picture of light emission.

  8. Vitamin A Test

    Science.gov (United States)

    ... was last reviewed on October 21, 2015. This article was last modified on June 29, 2018. At a Glance Why Get Tested? To detect vitamin A deficiency or toxicity When To Get Tested? When you have symptoms suggesting a vitamin A deficiency or excess, or are at risk for a deficiency Sample ...

  9. 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)

  10. 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…

  11. Radiation detector. [100 A

    Energy Technology Data Exchange (ETDEWEB)

    Baker, P D; Hollands, D V

    1975-12-04

    A radiation detector is described in which the radiation is led to a sensor via a 100 A thick gold film filter, which reduces the infrared components of the irradiation to a greater extent than the ultra-violet component reaching the sensor.

  12. A Trail of Roses

    DEFF Research Database (Denmark)

    Ørum, Tania

    2015-01-01

    Heissenbüttel and Max Bense. The Danish poet and critic Hans-Jørgen Nielsen Nielsen used Gertrude Stein as a prominent example in his campaign to widen the conception of literary texts in the conservative Danish context. In one of his essays he used Stein’s sentence: a rose is a rose is a rose is a rose...

  13. 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

  14. 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

  15. A Single Atom Antenna

    International Nuclear Information System (INIS)

    Trinter, Florian; Williams, Joshua B; Weller, Miriam; Waitz, Markus; Pitzer, Martin; Voigtsberger, Jörg; Schober, Carl; Kastirke, Gregor; Müller, Christian; Goihl, Christoph; Burzynski, Phillip; Wiegandt, Florian; Wallauer, Robert; Kalinin, Anton; Schmidt, Lothar Ph H; Schöffler, Markus S; Jahnke, Till; Dörner, Reinhard; Chiang, Ying-Chih; Gokhberg, Kirill

    2015-01-01

    Here we demonstrate the smallest possible implementation of an antenna-receiver complex which consists of a single (helium) atom acting as the antenna and a second (neon) atom acting as a receiver. (paper)

  16. Finding a Neurosurgeon

    Science.gov (United States)

    Tip: Finding A Neurosurgeon The first step in getting proper treatment for Chiari is to find the right doctor. While many patients are ... surgical, Conquer Chiari recommends that patients see a neurosurgeon for evaluation. As a policy, Conquer Chiari does ...

  17. A costal dispersion model

    International Nuclear Information System (INIS)

    Rahm, L.; Nyberg, L.; Gidhagen, L.

    1990-01-01

    A dispersion model to be used off costal waters has been developed. The model has been applied to describe the migration of radionuclides in the Baltic sea. A summary of the results is presented here. (K.A.E)

  18. A Virtual Research Partner

    National Research Council Canada - National Science Library

    Cowie, Jim; Guerrero, Felicia

    2006-01-01

    .... The goal was to investigate the feasibility of creating a software agent that would be able to interact with researchers and provide them with support at a level equivalent to a human research partner...

  19. What Causes a Toothache?

    Science.gov (United States)

    ... See a Dentist? What is Dental Amalgam (Silver Filling)? Temporomandibular Joint Disorder Men: Looking for a Better ... sinus or ear infections and tension in the facial muscles can cause discomfort that resembles a toothache, ...

  20. 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.

  1. Whistleblowing: a legal commentary.

    Science.gov (United States)

    Cornock, Marc

    2011-10-01

    This article examines the legal position of a nurse who believes that a colleague is performing below the level of competence required, witnesses inappropriate action by a colleague, or who believes that the care environment is putting patients at risk.

  2. Vitamin A blood test

    Science.gov (United States)

    ... A higher than normal value means you have excess vitamin A in your blood (toxic levels). This may ... Saunders; 2013:1175-1177. Ross AC, Tan L. Vitamin A deficiencies and excess. In: Kliegman RM, Stanton BF, St. Geme JW, ...

  3. Find a Dermatologist

    Science.gov (United States)

    ... Practice Tools Education Meetings & Events Advocacy Public & Patients Find a Dermatologist Why see a dermatologist? Learn more . ... Last Name Search Special Proprietary Notice and Disclaimer "Find a Dermatologist" is produced by the American Academy ...

  4. Helping a Grieving Parent

    Science.gov (United States)

    ... to stick with a TV show. Reading a newspaper may take longer than before, and retaining information ... Foundation: A Timeline Watch Our Video: Grief in Schools Copyright Information The materials on this website are ...

  5. Travelers' Health: Hepatitis A

    Science.gov (United States)

    ... 3 - Helminths, Soil-Transmitted Chapter 3 - Hepatitis B Hepatitis A Noele P. Nelson INFECTIOUS AGENT Hepatitis A ... hepatitis/HAV Table 3-02. Vaccines to prevent hepatitis A VACCINE TRADE NAME (MANUFACTURER) AGE (Y) DOSE ...

  6. People Are a Resource.

    Science.gov (United States)

    Schubert, Clarence

    1979-01-01

    This is a description of a model for demonstrating an approach to improving slums in Indonesia and the Philippines. The strategy of using people rather than financial capital as a resource is discussed. (SA)

  7. 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.

  8. A Double Hurdle Approach

    African Journals Online (AJOL)

    2017-05-01

    May 1, 2017 ... show that enterprise size, interest rate, loan duration, level of profit ..... is a dummy taking a value of 1 if enterprise is in trading of agricultural ..... government's role in ensuring a stable macroeconomic environment that favours.

  9. A timeless music dictionary

    African Journals Online (AJOL)

    R.B. Ruthven

    Abstract: A music dictionary for the Internet fulfils the same functions as printed .... This does not mean that there cannot be a cognitive gain through a communi- ... 2006, and has, since its completion in August 2006, been accessible free of.

  10. Gardening from a Wheelchair

    Science.gov (United States)

    ... Paralysis > Health > Staying active > Gardening from a wheelchair Gardening from a wheelchair ☷ ▾ Page contents Tips from community ... round handles) on gate latches, doors, and faucets. Gardening as therapy For Gene Rothert gardening is a ...

  11. 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...... – mirrored in online memorial sites – that transform the dead child into a being with whom an altered relationship may be built, maintained and developed so that the bereaved can, eventually, integrate the dead into his or her ongoing life.......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...... that when it comes to bereavement practices as they materialize on children’s graves, it is the accommodation and decoration of the grave itself that function as media with their variety of physical objects as ritual and relational tools for communication. The bereaved perform practices on children’s graves...

  12. 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...

  13. 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.

  14. A power measuring device

    International Nuclear Information System (INIS)

    As, R. van.

    1985-01-01

    As a part of the klystron test facility of the Dutch NIKHEF-K accelerator, a sensitive power measuring device has been built. The high-frequency power of a klystron is stored in a water-cooled dummy load. Using a microcomputer, the increase of the water temperature and the water flow rate are transformed to a digital indication of the klystron power. (Auth.)

  15. Life of a star

    International Nuclear Information System (INIS)

    Henbest, Nigel.

    1988-01-01

    The paper concerns the theory of stellar evolution. A description is given of:- how a star is born, main sequence stars, red giants, white dwarfs, supernovae, neutron stars and black holes. A brief explanation is given of how the death of a star as a supernova can trigger off the birth of a new generation of stars. Classification of stars and the fate of our sun, are also described. (U.K.)

  16. 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.…

  17. A Beautiful Spin

    International Nuclear Information System (INIS)

    Ji Xiangdong

    2003-01-01

    Spin is a beautiful concept that plays an ever important role in modern physics. In this talk, I start with a discussion of the origin of spin, and then turn to three themes in which spin has been crucial in subatomic physics: a lab to explore physics beyond the standard model, a tool to measure physical observables that are hard to obtain otherwise, a probe to unravel nonperturbative QCD. I conclude with some remarks on a world without spin

  18. 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.

  19. '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....

  20. 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.

  1. Packing a cake into a box

    KAUST Repository

    Skopenkov, Mikhail

    2011-01-01

    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.

  2. A white book for a greener future

    International Nuclear Information System (INIS)

    2016-01-01

    The energy transition law promulgated in August 2015 and the Paris Agreement in December 2016 have marked the necessity to build an energy mix with a growing up importance given to renewable energy sources. The French Gas Association (AFG) and the gas industry have joint their efforts to promote the advantages of natural gas as a support to the development of renewable energies. The publication of the AFG white book on September 27 is an illustration of this promotional action. This article provides an overview of the 10 proposals of this white book: 1 - promoting all renewable energy sources; 2 - Making energy transition in the regions a success; 3 - Improving air quality thanks to clean mobility; 4 - Reducing greenhouse gas emissions; 5 - Reducing energy consumption in accommodations; 6 - Fighting fuel poverty; 7 - Contributing to the energy security supplies of France; 8 - Making energy taxation more efficient; 9 - Storing energy while accompanying renewable energy sources development; 10 - Promoting innovation

  3. A look at Supernova 1987A

    International Nuclear Information System (INIS)

    Schramm, D.N.

    1987-10-01

    Supernova 1987A is reviewed with emphasis on the neutrino observations. It is shown that the results fit well with the expectations for neutrino temperatures (T ∼ 4ε 0 4.5 MeV) and total energy emitted (2ε 0 4 x 10 53 ergs). It is argued that the detection tends to favor collapse models that yield emission for 10 second timescales with a 1ε 0 2 second early accretion phase followed by Kelvin-Helmholtz cooling as opposed to prompt shocks with the immediate onset of cooling. It is also argued that the probable detection of one or more electron scattering event favors a superthermal tail at high energies. Neutrino mass limits and flavor limits are comparable to laboratory experiments. An estimate for future collapse rates in our galaxy of 1/7 year is made based on nucleosynthesis yields. The supernova also has eliminated many axion and majoron models. 69 refs., 3 figs., 27 tabs

  4. 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...... that when it comes to bereavement practices as they materialize on children’s graves, it is the accommodation and decoration of the grave itself that function as media with their variety of physical objects as ritual and relational tools for communication. The bereaved perform practices on children’s graves...... – mirrored in online memorial sites – that transform the dead child into a being with whom an altered relationship may be built, maintained and developed so that the bereaved can, eventually, integrate the dead into his or her ongoing life....

  5. 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.

  6. A waterproof composition

    Energy Technology Data Exchange (ETDEWEB)

    Uemura, M; Sato, Y

    1983-06-29

    The composition, which is effective for isolating an oozy slurry, water and cement ooze in a well with breaks in a stratum, contains bentonite, a filler (N), for which a fiberous material may be used, a petroleum product (NP), a surfacant (PAV) and a binder (S), hydrogen from shells from Persian wallnuts, feed husks, gilsonite, diatomite, peat coke, ground stone, brick or concrete, glass fragments, rubber cord and so on; a fiberous material (cotton, wood fiber, cellulose mass, fiberglass, leather sections and so on). It also contains petroleum product kerosene, boiler fuel, lubricating oil or petroleum residues, C bitumen, resin, carboxymethylcelulose, polyvinyl sulfide and pitch.

  7. 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 $p$....

  8. Bibliografía

    OpenAIRE

    2013-01-01

    Fuentes Primarias A. C. S. F. – Archivo del Convento de San Francisco A. G. N. – Archivo General de la Nación Escribanos CARVONERO DE ALVA, A., 1657 – protocolo 261, f. 1386. FIGUEROA de, M. A., 1643 – protocolo 590, f. 405 vta. FIGUEROA de, M. A., 1654 – protocolo 616, f. 1079. FIGUEROA de, M. A., 1662 – protocolo 641, f. 2154. FIGUEROA de, M. A., 1665 – protocolo 652, f. 1313-1314. GARCÍA, N., 1666 – protocolo 706, f. 677 vta. GÓMEZ DE BAEZA, R., 1597-1598 – protocolo 56, f. 644. HERNÁNDEZ,...

  9. Converting a Microwave Oven into a Plasma Reactor: A Review

    Directory of Open Access Journals (Sweden)

    Victor J. Law

    2018-01-01

    Full Text Available This paper reviews the use of domestic microwave ovens as plasma reactors for applications ranging from surface cleaning to pyrolysis and chemical synthesis. This review traces the developments from initial reports in the 1980s to today’s converted ovens that are used in proof-of-principle manufacture of carbon nanostructures and batch cleaning of ion implant ceramics. Information sources include the US and Korean patent office, peer-reviewed papers, and web references. It is shown that the microwave oven plasma can induce rapid heterogeneous reaction (solid to gas and liquid to gas/solid plus the much slower plasma-induced solid state reaction (metal oxide to metal nitride. A particular focus of this review is the passive and active nature of wire aerial electrodes, igniters, and thermal/chemical plasma catalyst in the generation of atmospheric plasma. In addition to the development of the microwave oven plasma, a further aspect evaluated is the development of methodologies for calibrating the plasma reactors with respect to microwave leakage, calorimetry, surface temperature, DUV-UV content, and plasma ion densities.

  10. Melatonin as a radioprotective agent: a review

    International Nuclear Information System (INIS)

    Vijayalaxmi; Reiter, Russel J.; Tan, D.-X.; Herman, Terence S.; Thomas, Charles R.

    2004-01-01

    Melatonin (N-acetyl-5-methoxytryptamine), the chief secretory product of the pineal gland in the brain, is well known for its functional versatility. In hundreds of investigations, melatonin has been documented as a direct free radical scavenger and an indirect antioxidant, as well as an important immunomodulatory agent. The radical scavenging ability of melatonin is believed to work via electron donation to detoxify a variety of reactive oxygen and nitrogen species, including the highly toxic hydroxyl radical. It has long been recognized that the damaging effects of ionizing radiation are brought about by both direct and indirect mechanisms. The direct action produces disruption of sensitive molecules in the cells, whereas the indirect effects (∼70%) result from its interaction with water molecules, which results in the production of highly reactive free radicals such as · OH, · H, and e aq - and their subsequent action on subcellular structures. The hydroxyl radical scavenging ability of melatonin was used as a rationale to determine its radioprotective efficiency. Indeed, the results from many in vitro and in vivo investigations have confirmed that melatonin protects mammalian cells from the toxic effects of ionizing radiation. Furthermore, several clinical reports indicate that melatonin administration, either alone or in combination with traditional radiotherapy, results in a favorable efficacy:toxicity ratio during the treatment of human cancers. This article reviews the literature from laboratory investigations that document the ability of melatonin to scavenge a variety of free radicals (including the hydroxyl radical induced by ionizing radiation) and summarizes the evidence that should be used to design larger translational research-based clinical trials using melatonin as a radioprotector and also in cancer radiotherapy. The potential use of melatonin for protecting individuals from radiation terrorism is also considered

  11. Hotelier: a Passion or a Profession?

    Directory of Open Access Journals (Sweden)

    Agung Gita Subakti

    2013-05-01

    Full Text Available The history of hotels is intimately connected to that of civilizations. Or rather, it is a part of that history. Through years and time, many people are making their mark in the hotel industry by gaining the title as a Hotelier. Not just nationwide but they placed their footsteps throughout the world and became leading people in the Hospitality industry. The aim of this paper is to overview some of the people who had achieve the reputation as an Hotelier: globally recognized, set up their set of high quality standard, developing international brand and be able to sustain and succeed worldwide.

  12. A Plea for a Simple Solution

    DEFF Research Database (Denmark)

    Widell, Peter

    2010-01-01

    This paper presents a criticism of the classical speech act theory (Austin, Searle). In contrast to this theory, which operates with four to five types of basic illocutionary acts, I will argue for just one type: the assertive. Assertives are speech acts which can make locutions (propositions) tr...... and false. It is the major argument in the paper that the assertive is the only kind of illocution we need, and that any suggestion that it should be otherwise has bad consequences for ontology, logic and a decent theory of meaning....

  13. A strategic approach to a green economy.

    Science.gov (United States)

    Trumka, Richard L

    2009-01-01

    The crash has happened and we face dual market failures: climate change and the greatest economic crisis of our lifetimes. American labor believes that we must have a strategic approach to greening the economy centered on domestic investment in new technologies, the creation of good jobs, and leading a shared international response to both these issues. The nay-sayers are the same financial and industrial interests that advised the world economy into chaos. Their advice to us is more of the same: no rules, no regulations, free markets, and free trade. But now is the time for real change.

  14. Transvestism as a Symptom: A Case Series.

    Science.gov (United States)

    Anupama, M; Gangadhar, K H; Shetty, Vandana B; Dip, P Bhadja

    2016-01-01

    Transvestism, commonly termed as cross-dressing, means to dress in the clothing of opposite sex. We describe a series of three cases with transvestism as one of their primary complaints. The discussion sheds light on the various ways in which transvestism as a symptom can present in Psychiatry. In the first two cases, there was lower intelligence. In first and third case, there were other paraphilia along with transvestism. Second case had co-morbid obsessive-compulsive disorder (OCD) and had good response to selective serotonin reuptake inhibitor (SSRI).

  15. Creating a competitive PSO: a case study.

    Science.gov (United States)

    Calvaruso, J T

    1999-06-01

    Mount Carmel Health System, an integrated delivery system in Columbus, Ohio, became a Medicare+Choice contractor in response to unsatisfactory payment proposals from the Medicare contractors it serviced and to compete with the increasing number of managed care providers in its market. To meet HCFA's operational requirements, Mount Carmel upgraded and expanded its administrative and health information systems and solicited the support of its network physicians. It also developed a marketing strategy to promote its health plan. In the two years after instituting its provider-sponsored organization, Mount Carmel surpassed its original enrollment projections, decreased its patient management and utilization costs, and increased payments to its network members.

  16. A rationale for a museum of health

    Directory of Open Access Journals (Sweden)

    Farzaneh Yousefi

    2015-11-01

    Full Text Available The museum of health is a place that presents health science and human body and any other subjects that can affect human health. In this museum visitors can learn the mechanisms and functions of human body and learn how to protect and take care of their bodies. They can also learn several diseases and their consequences on human body and how to fight against them. This museum is a big step for improvement of general society health level by increasing society’s health knowledge. In this article structure, departments and also benefits of the health museum are evaluated.

  17. Diplopia: A Practical Approach

    Directory of Open Access Journals (Sweden)

    Igor Šivec

    2015-06-01

    Full Text Available Diplopia means seeing two images of the same, one object. It is a symptom with numerous causes that can involve many different structures. The cause can lay in the eyeball itself: the cornea, the lens and the retina or behind the eyeball: in the orbit or intracranial. Diplopia is only a symptom that can indicate a life threatening ilness like an aneurysm, a dissection or a brain tumor. That is why when presented with it we have to do a thorough examination and look for a red flag that could indicate danger. This way we can make a timely intervention, saving the patients sight or life. This article describes the most crucial signs of a dangerous underlying condition that we cannot afford to miss, a practical guide to the historical assesment, as well as to the physical examination of a patient with double vision to help localize the cause.

  18. A dream – a small apartment?

    Directory of Open Access Journals (Sweden)

    Barbara Černič Mali

    1993-01-01

    Full Text Available The article deals with changes in the housing market in Slovenia after the new Law on Housing was accepted, especially on the secondary market, meaning housing which isn’t newly built. Presented are the results of a survey, conducted by telephone and the data of real-estate agencies.

  19. A Beautiful End to a Day.

    Science.gov (United States)

    Johns, Pat

    2000-01-01

    Focuses on a second grade art lesson (two 40-minute class periods) in which students use stencils, oil pastels, and watercolors to create an impressionistic landscape. Discusses how to create the stencils, using oaktags, and how to create the picture. (CMK)

  20. A test of a design process scale

    NARCIS (Netherlands)

    Marinakis, Yorgos; Harms, Rainer; Walsh, Steven Thomas

    2015-01-01

    Design is a type of innovation that focuses on creating new product and service meanings. Models of the design process are important because they can help firms manage their product and service design processes to obtain competitive advantage. Empirically-based models of the design process are

  1. A Contribution Towards A Grammar of Code

    Directory of Open Access Journals (Sweden)

    David M. Berry

    2008-01-01

    Full Text Available Over the past thirty years there has been an increasing interest in the social and cultural implications of digital technologies and ‘informationalism’ from the social sciences and humanities. Generally this has concentrated on the implications of the “convergence” of digital devices and services, understood as linked to the discrete processing capabilities of computers, which rely on logical operations, binary processing and symbolic representation. In this paper, I wish to suggest that a ‘grammar of code’ might provide a useful way of thinking about the way in which digital technologies operate as a medium and can contribute usefully to this wider debate. I am interested in the way in which the dynamic properties of code can be understood as operating according to a grammar reflected in its materialisation and operation in the lifeworld – the discretisation of the phenomenal world. As part of that contribution in this paper I develop some tentative Weberian ‘ideal-types’. These ideal-types are then applied to the work of the Japanese composer, Masahiro Miwa, whose innovative ‘Reverse-Simulation music’ models the operation of basic low-level digital circuitry for the performance and generation of musical pieces.

  2. Just a Body in a Wheelchair

    Science.gov (United States)

    Rosen, Betty

    2014-01-01

    This article has no direct link with academics, children, students or those who teach: I severed almost all such connections several years ago. It describes the rewards and challenges of leading a reminiscence group of elderly people, all of whom suffer some level of memory loss and/or severe physical disability; most are wheelchair-bound. It…

  3. Mourning a Lost Childhood: A Therapeutic Task.

    Science.gov (United States)

    Kulish, Nancy Mann

    J. M. Barrie's popular story of Peter Pan depicts the never-neverland of an endless happy childhood. Analysis of the story and of J. M. Barrie's personal background, however, reveals that the tale is a conflicted solution to and separation from early childhood losses and disappointments. Themes of separation and reunion, redesertion and revenge…

  4. A Little Salesmanship "Grows" a Long Way

    Science.gov (United States)

    Montas, Leah

    2012-01-01

    Goshen Elementary PTA's membership shrank the first year the author was PTA president. In the back of her mind, she was bothered by the fact that their membership numbers had dropped. So, after she attended a regional session with her vice president on growing membership, she got the courage to propose something different. They discussed with…

  5. A NOVEL PROTON TRANSFER COMPOUND (A NEW ...

    African Journals Online (AJOL)

    Preferred Customer

    intermolecular proton transfer from (MoO4H2) to (OHRNH2) results in the formation of a new molybdate salt that ... KEY WORDS: Proton transfer, Molybdate salt, X-ray structure, MoO2(acac)2, 2-Amino-2-methyl-1-propanol ..... data can be obtained free of charge on application to The Director, CCDC, 12 Union Road,.

  6. Is a Mealworm Really a Worm?

    Science.gov (United States)

    Lott, Kimberly; Read, Sylvia

    2012-01-01

    Many times students are given the task of keeping a science notebook, but do not fully understand the process or purpose of this endeavour. Science notebooks contain not only data but also questions, predictions, observations, and reflections from their experiences in science. To maximize the effectiveness of the science notebook, teachers must…

  7. Life of a Tooth: A Visual Timeline

    Medline Plus

    Full Text Available ... 2018 About | Contact InfoBites Quick Reference Learn more Oral Health and Overal Health Headaches and Jaw Pain? Check ... Tooth Home | InfoBites | Find a Dentist | Your Family's Oral Health | RSS About AGD | Contact AGD | Site Map | Reprints ...

  8. S.A.A.F. IN KOREA

    African Journals Online (AJOL)

    barbed wire, clearing fields of fire, laying mines, constructing ... During this advance they encountered heavy enemy resis- .... 2x vehicles on 15 May,. Lt, A.B, de Wet damaged: Lt. M. Frosl. 1x vehicle ..... He had to land at K-16 without brakes as.

  9. Half a Congress--Half a Loaf.

    Science.gov (United States)

    Florio, David H.

    1980-01-01

    Summarizes current congressional action affecting educational research and related activities, including appropriations, the Higher Education Act reauthorization, a new research and technology act, and legislation regarding educational testing, youth unemployment and training, paperwork and red tape reduction, and research privacy. (GC)

  10. A Boy with a Large Bladder Stone

    Directory of Open Access Journals (Sweden)

    Kuo-Shen Chow

    2008-08-01

    Full Text Available Despite the frequent association of urinary tract infection with vesicoureteral reflux and urinary calculi, since vesicouretal reflux is induced by bladder stones, the coexistence of vesicoureteral reflux and bladder stones is rare. Because of its occurrence in children belonging to poor socioeconomic groups, it is believed to be a deficiency disorder. Most cases of bladder stones occur between the ages of 2 and 5 years. Common clinical presentations of bladder stones include urinary dribbling and enuresis, frequency of micturition, pain during micturition, pelvic pain and hematuria. We report the occurrence of a large bladder stone in a boy, who experienced intermittent lower abdominal pain and urinary incontinence, both during the day and at night. He had been diagnosed with enuresis and treated in pediatric clinics for 1 year. Delayed diagnosis resulted in bladder stone formation. The stone was larger than 2.5 cm and open vesicolithotomy was therefore selected as the best and safest treatment choice. His symptoms disappeared after surgery. Thorough metabolic and environmental evaluations of such cases are required on an individual basis. Bladder stones should be considered as a possible diagnosis in children presenting with urinary incontinence.

  11. Consciousness Is a Thing, Not a Process

    Directory of Open Access Journals (Sweden)

    Susan Pockett

    2017-12-01

    Full Text Available The central dogma of cognitive psychology is ‘consciousness is a process, not a thing’. Hence, the main task of cognitive neuroscientists is generally seen as working out what kinds of neural processing are conscious and what kinds are not. I argue here that the central dogma is simply wrong. All neural processing is unconscious. The illusion that some of it is conscious results largely from a failure to separate consciousness per se from a number of unconscious processes that normally accompany it—most particularly focal attention. Conscious sensory experiences are not processes at all. They are things: specifically, spatial electromagnetic (EM patterns, which are presently generated only by ongoing unconscious processing at certain times and places in the mammalian brain, but which in principle could be generated by hardware rather than wetware. The neurophysiological mechanisms by which putatively conscious EM patterns are generated, the features that may distinguish conscious from unconscious patterns, the general principles that distinguish the conscious patterns of different sensory modalities and the general features that distinguish the conscious patterns of different experiences within any given sensory modality are all described. Suggestions for further development of this paradigm are provided.

  12. A Glass without a Bottom’

    DEFF Research Database (Denmark)

    Karpova, Yulia

    2017-01-01

    In the 1950s, Soviet decorative artists, under the influence of the incipient industrial design profession, chose utility, modesty and the ability for mass reproduction as the chief criteria for their work. Some critics envisioned a confluence of decorative art and industrial design. However, fro...

  13. What Is A Homosexual? A Definitional Model.

    Science.gov (United States)

    Berger, Raymond M.

    1983-01-01

    Presents a definitional model to explain homosexuality and discusses its implications for practice. Contends that social workers must discard the traditional binary model of hetersexual versus homesexual for one incorporating relevant psychosocial factors including life experiences, social reaction, and association with others. (Author/JAC)

  14. When is a dose not a dose?

    International Nuclear Information System (INIS)

    Green, Patrick

    1992-01-01

    There is confusion over radiation dose limits between the International Commission on Radiological Protection, the National Radiological Protection Board and the Ministry of Agriculture, Fisheries and Food (MAFF), reports a Friends of the Earth's radiation campaigner. MAFF is suggesting the inadequate ICRP public dose limit does not apply to public exposures which arise from environmental contamination from past radioactive discharges. (author)

  15. Life of a Tooth: A Visual Timeline

    Medline Plus

    Full Text Available ... Oral Health About the AGD Dental care and oral health information you need from the Academy of General Dentistry Sunday, June 24, 2018 About | Contact InfoBites Quick Reference Learn more Nutrition - Adults When Should My Child First See a ...

  16. A Little Goes a Long Way

    Science.gov (United States)

    Woo, Vila

    2007-01-01

    The process of art-making is integral to the development of a child's fine motor skills, coordination, and concentration. Therefore, creating an ongoing project one or two weeks in length can benefit both teacher and students. The teacher can assess the children's skills by observing the way they handle materials. Also, after spending valuable…

  17. A priori a matematika u Berkeleyho

    Czech Academy of Sciences Publication Activity Database

    Tomeček, Marek

    2014-01-01

    Roč. 62, č. 3 (2014), s. 369-385 ISSN 0015-1831 R&D Projects: GA ČR(CZ) GAP401/11/0371 Institutional support: RVO:67985955 Keywords : a priori * mathematics * empiricism * George Berkeley Subject RIV: AA - Philosophy ; Religion

  18. Life of a Tooth: A Visual Timeline

    Medline Plus

    Full Text Available ... About | Contact InfoBites Quick Reference Learn more Oral Health and Overal Health What is Orofacial Pain? Temporomandibular Joint Disorder What ... Home | InfoBites | Find a Dentist | Your Family's Oral Health | RSS About AGD | Contact AGD | Site Map | Reprints ...

  19. S.A.A.F. IN KOREA

    African Journals Online (AJOL)

    over this artificial boundary was proclaimed.5 The ... by FEAF intelligence officers to have been the result of a conference ... occupied with what amounted to plain hard work. The bulk ... The great disadvantage of K-10 was its distance from the ...

  20. Life of a Tooth: A Visual Timeline

    Medline Plus

    Full Text Available ... About | Contact InfoBites Quick Reference Learn more Oral Health and Overal Health What is a Composite Resin (White Filling)? How ... Have Negative and Positive Effects Why is Oral Health Important for Men? Are You Biting Off More ...