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Sample records for 23na izmenenie formy

  1. Breakup studies with {sup 23}Na

    Energy Technology Data Exchange (ETDEWEB)

    Jarvis, N.S.; Watson, D.L.; Gyapong, G.J.; Jones, C.D. [University of York, York YO1 5DD (United Kingdom); Bennett, S.J.; Freer, M.; Fulton, B.R.; Karban, O.; Murgatroyd, J.T.; Tungate, G. [University of Birmingham, Birmingham, B15 2TT (United Kingdom); Rae, W.D.M.; Smith, A.E. [University of Oxford, Oxford, OX1 3RA (United Kingdom)

    1995-05-01

    The breakup of {sup 23}Na nuclei into {sup 11}B+{sup 12}C and of {sup 24}Mg nuclei into {sup 12}C+{sup 12}C has been studied using the reactions {sup 12}C({sup 23}Na,{sup 11}B{sup 12}C){sup 12}C and {sup 12}C({sup 23}Na,{sup 12}C{sup 12}C){sup 11}B. Clear evidence was found for the breakup of the {sup 23}Na and {sup 24}Mg nuclei into the ground states of both fragments. The yieldrotect from the {sup 12}C({sup 23}Na,{sup 11}B{sub g.s.}{sup 12}C{sub g.s.}){sup 12}C{sub g.s.} reaction was concentrated in the region of excitationrotect energy in {sup 23}Na between 24 and 28 MeV and fragmented among a number of states. Therotect {sup 12}C({sup 23}Na,{sup 12}C{sub g.s.} {sup 12}C{sub g.s.)}{sup 11}B{sub g.s.} reaction was found to proceed chiefly via broad states at 22.1 and 23.9 MeV in {sup 24}Mg.

  2. 23Na and 1H NMR Microimaging of Intact Plants

    Science.gov (United States)

    Olt, Silvia; Krötz, Eva; Komor, Ewald; Rokitta, Markus; Haase, Axel

    2000-06-01

    23Na NMR microimaging is described to map, for the first time, the sodium distribution in living plants. As an example, the response of 6-day-old seedlings of Ricinus communis to exposure to sodium chloride concentrations from 5 to 300 mM was observed in vivo using 23Na as well as 1H NMR microimaging. Experiments were performed at 11.75 T with a double resonant 23Na-1H probehead. The probehead was homebuilt and equipped with a climate chamber. T1 and T2 of 23Na were measured in the cross section of the hypocotyl. Within 85 min 23Na images with an in-plane resolution of 156 × 156 μm were acquired. With this spatial information, the different types of tissue in the hypocotyl can be discerned. The measurement time appears to be short compared to the time scale of sodium uptake and accumulation in the plant so that the kinetics of salt stress can be followed. In conclusion, 23Na NMR microimaging promises great potential for physiological studies of the consequences of salt stress on the macroscopic level and thus may become a unique tool for characterizing plants with respect to salt tolerance and salt sensitivity.

  3. Study of thermal neutron capture in /sup 23/Na

    Energy Technology Data Exchange (ETDEWEB)

    Zhang Ming; Shi Zongren; Zeng Xiantang; Li Guohua; Ding Dazhao

    1987-11-01

    Energies and intensities of 117 gamma-rays produced by the capture of thermal neutron in /sup 23/Na are measured by using a single Ge(Li) detector and a pair spectrometer. 107 gamma-rays are placed in the decay scheme consisting of 35 levels. The neutron binding energy is found to be 6959.51 (21) keV. The parameters of /sup 24/Na energy level density are determined with the Back-Shift Fermi Gas Model. The /sup 23/Na(n, ..gamma..)/sup 24/Na reaction is mainly a statistical process from the resonance capture of 2.85 keV state.

  4. Study of thermal neutron capture in /sup 23/Na

    Energy Technology Data Exchange (ETDEWEB)

    Zhang Ming; Shi Zongren; Zeng Xiantang; Li Guohua; Ding Dazhao

    1989-04-01

    Energies and intensities of 117 gamma-rays produced by the capture of thermal neutrons in /sup 23/Na are measured by using a single Ge(Li) detector and a pair spectrometer. 107 gamma-rays are placed in a decay scheme consisting of 35 levels. The neutron binding energy is found to be 6959.51 (21) keV. The parameters of /sup 24/Na energy-level density are determined with the Back-Shift Fermi Gas Model. The /sup 23/Na(/ital n/,..gamma..) /sup 24/Na reaction is mainly a statistical process from the resonance capture of the 2.85 keV state.

  5. Protons from the alpha-particle bombardment of 23Na

    NARCIS (Netherlands)

    Kuperus, J.

    1964-01-01

    Resonances in the yield of ground-state protons from alpha-particle bombardment of 23Na were investigated in the energy range Eα = 1.0 – 3.3 MeV. At least thirty-eight resonances were observed. Resonance energies and strengths are presented. At nine resonances angular distribution measurements lead

  6. Experimental study of the astrophysically important 23Na(α ,p )26Mg and 23Na(α ,n )26Al reactions

    Science.gov (United States)

    Avila, M. L.; Rehm, K. E.; Almaraz-Calderon, S.; Ayangeakaa, A. D.; Dickerson, C.; Hoffman, C. R.; Jiang, C. L.; Kay, B. P.; Lai, J.; Nusair, O.; Pardo, R. C.; Santiago-Gonzalez, D.; Talwar, R.; Ugalde, C.

    2016-12-01

    The 23Na(α ,p )26Mg and 23Na(α ,n )26Al reactions are important for our understanding of the 26Al abundance in massive stars. The aim of this work is to report on a direct and simultaneous measurement of these astrophysically important reactions using an active target system. The reactions were investigated in inverse kinematics using 4He as the active target gas in the detector. We measured the excitation functions in the energy range of about 2 to 6 MeV in the center of mass. We have found that the cross sections of the 23Na(α ,p )26Mg and the 23Na(α ,n )26Al reactions are in good agreement with previous experiments and with statistical-model calculations. The astrophysical reaction rate of the 23Na(α ,n )26Al reaction has been reevaluated and it was found to be larger than the recommended rate.

  7. In vivo sodium (23Na) imaging of the human kidneys at 7 T: preliminary results.

    Science.gov (United States)

    Haneder, Stefan; Juras, Vladimir; Michaely, Henrik J; Deligianni, Xeni; Bieri, Oliver; Schoenberg, Stefan O; Trattnig, Siegfried; Zbýň, Štefan

    2014-02-01

    To evaluate the feasibility of in vivo (23)Na imaging of the corticomedullary (23)Na gradient and to measure (23)Na transverse relaxation times (T2*) in human kidneys. In this prospective, IRB-approved study, eight healthy volunteers (4 female, 4 male; mean age 29.4 ± 3.6 years) were examined on a 7-T whole-body MR system using a (23)Na-only spine-array coil. For morphological (23)Na-MRI, a 3D gradient echo (GRE) sequence with a variable echo time scheme (vTE) was used. T2* times were calculated using a multiecho 3D vTE-GRE approach. (23)Na signal-to-noise ratios (SNR) were given on a pixel-by-pixel basis for a 20-mm section from the cortex in the direction of the medulla. T2* maps were calculated by fitting the (23)Na signal decay monoexponentially on a pixel-by-pixel basis, using least squares fit. Mean corticomedullary (23)Na-SNR increased from the cortex (32.2 ± 5.6) towards the medulla (85.7 ± 16.0). The SNR increase ranged interindividually from 57.2% to 66.3%. Mean (23)Na-T2* relaxation times differed statistically significantly (P pyramid direction. • In vivo measurements of renal (23) Na-T2* times are demonstrated at 7.0 T.

  8. $^{22}$Ne and $^{23}$Na ejecta from intermediate-mass stars: The impact of the new LUNA rate for $^{22}$Ne(p,$\\gamma$)$^{23}$Na

    CERN Document Server

    Slemer, A; Piatti, D; Aliotta, M; Bemmerer, D; Best, A; Boeltzig, A; Bressan, A; Broggini, C; Bruno, C G; Caciolli, A; Cavanna, F; Ciani, G F; Corvisiero, P; Davinson, T; Depalo, R; Di Leva, A; Elekes, Z; Ferraro, F; Formicola, A; F\\", Zs; l\\",; p,; Gervino, G; Guglielmetti, A; Gustavino, C; Gy\\", G; rky,; Imbriani, G; Junker, M; Menegazzo, R; Mossa, V; Pantaleo, F R; Prati, P; Straniero, O; Sz\\", T; cs,; Tak\\', M P; cs,; Trezzi, D

    2016-01-01

    We investigate the impact of the new LUNA rate for the nuclear reaction $^{22}$Ne$(p,\\gamma)^{23}$Na on the chemical ejecta of intermediate-mass stars, with particular focus on the thermally-pulsing asymptotic giant branch (TP-AGB) stars that experience hot-bottom burning. To this aim we use the PARSEC and COLIBRI codes to compute the complete evolution, from the pre-main sequence up to the termination of the TP-AGB phase, of a set of stellar models with initial masses in the range $3.0\\,M_{\\odot} - 6.0\\,M_{\\odot}$, and metallicities $Z_{\\rm i}=0.0005$, $Z_{\\rm i}=0.006$, and $Z_{\\rm i} = 0.014$. We find that the new LUNA measures have much reduced the nuclear uncertainties of the $^{22}$Ne and $^{23}$Na AGB ejecta, which drop from factors of $\\simeq 10$ to only a factor of few for the lowest metallicity models. Relying on the most recent estimations for the destruction rate of $^{23}$Na, the uncertainties that still affect the $^{22}$Ne and $^{23}$Na AGB ejecta are mainly dominated by evolutionary aspects (e...

  9. Gamow-Teller strength in {sup 23}Na({ital n},{ital p}) and a comparison to {sup 23}Na({mu}{sup {minus}},{nu})

    Energy Technology Data Exchange (ETDEWEB)

    Siebels, B.; Gorringe, T.P.; Alford, W.P.; Bauer, J.; Evans, J.; El-Kateb, S.; Jackson, K.P.; Trudel, A.; Yen, S. [Department of Physics and Astronomy, University of Kentucky, Lexington, Kentucky 40506 (United States)]|[Department of Physics, University of Western Ontario, London, Ontario, N6A 3K7 (Canada)]|[TRIUMF, 4004 Wesbrook Mall, Vancouver, V6T 2A3 (Canada)]|[Department of Physics, Simon Fraser University, Vancouver, British Columbia, V5A 1S6 (Canada)]|[King Fahd University of Petroleum and Minerals, Dhahram (Saudi Arabia)

    1995-09-01

    We report measurements of the {sup 23}Na({ital n},{ital p}) differential cross section at an incident energy of 198 MeV and angles from 0{degree} to 24{degree} using the TRIUMF Charge Exchange Facility. From these data we determine Gamow-Teller (GT) transition probabilities to low lying 1/2{sup +}, 3/2{sup +}, and 5/2{sup +} {sup 23}Ne states and the GT{sup +} strength distribution up to 25 MeV excitation energy. The values of B{sub GT}{sup +} to discrete states, and the GT{sup +} strength below 10 MeV, are found to be in reasonable agreement with a full 1{ital s}-0{ital d} shell model calculation with a normalization factor of about 0.74. The GT{sup +} strength above 10 MeV suggests the removal of strength from lower to higher excitation energies. We also compare the {sup 23}Na({ital n},{ital p}) data with {sup 23}Na({mu}{sup {minus}},{nu}) data and find agreement between the values of B{sub GT}{sup +} to discrete levels extracted from the ({ital n},{ital p}) and ({mu}{sup {minus}},{nu}) reactions. The general consistency of the ({ital n},{ital p}) and ({mu}{sup {minus}},{nu}) data, and the full 1{ital s}-0{ital d} shell model calculation, give confidence in a recent extraction of the weak pseudoscalar coupling from {mu}{sup {minus}} capture on {sup 23}Na. Finally, using both {beta}{sup {minus}}-decay and {mu}{sup {minus}} capture data, we obtain unit cross sections from the {sup 23}Na({ital n},{ital p}) measurement.

  10. 22Ne and 23Na ejecta from intermediate-mass stars: the impact of the new LUNA rate for 22Ne(p, γ)23Na

    Science.gov (United States)

    Slemer, A.; Marigo, P.; Piatti, D.; Aliotta, M.; Bemmerer, D.; Best, A.; Boeltzig, A.; Bressan, A.; Broggini, C.; Bruno, C. G.; Caciolli, A.; Cavanna, F.; Ciani, G. F.; Corvisiero, P.; Davinson, T.; Depalo, R.; Di Leva, A.; Elekes, Z.; Ferraro, F.; Formicola, A.; Fülöp, Zs.; Gervino, G.; Guglielmetti, A.; Gustavino, C.; Gyürky, G.; Imbriani, G.; Junker, M.; Menegazzo, R.; Mossa, V.; Pantaleo, F. R.; Prati, P.; Straniero, O.; Szücs, T.; Takács, M. P.; Trezzi, D.

    2017-03-01

    We investigate the impact of the new LUNA rate for the nuclear reaction 22Ne(p, γ)23Na on the chemical ejecta of intermediate-mass stars, with particular focus on the thermally pulsing asymptotic giant branch (TP-AGB) stars that experience hot-bottom burning. To this aim, we use the PARSEC and COLIBRI codes to compute the complete evolution, from the pre-main sequence up to the termination of the TP-AGB phase, of a set of stellar models with initial masses in the range 3.0-6.0 M⊙ and metallicities Zi = 0.0005, 0.006 and 0.014. We find that the new LUNA measures have much reduced the nuclear uncertainties of the 22Ne and 23Na AGB ejecta that drop from factors of ≃10 to only a factor of few for the lowest metallicity models. Relying on the most recent estimations for the destruction rate of 23Na, the uncertainties that still affect the 22Ne and 23Na AGB ejecta are mainly dominated by the evolutionary aspects (efficiency of mass-loss, third dredge-up, convection). Finally, we discuss how the LUNA results impact on the hypothesis that invokes massive AGB stars as the main agents of the observed O-Na anticorrelation in Galactic globular clusters. We derive quantitative indications on the efficiencies of key physical processes (mass-loss, third dredge-up, sodium destruction) in order to simultaneously reproduce both the Na-rich, O-poor extreme of the anticorrelation and the observational constraints on the CNO abundance. Results for the corresponding chemical ejecta are made publicly available.

  11. {sup 23}Na nuclear magnetic resonance study of the structure and dynamic of natrolite

    Energy Technology Data Exchange (ETDEWEB)

    Paczwa, Mateusz; Olszewski, Marcin; Sergeev, Nikolaj [Szczecin Univ. (Poland). Inst. of Physics; Sapiga, Aleksej A.; Sapiga, Aleksej V. [Taurida National V.I. Vernadsky Univ., Simferopol, Crimea (Ukraine)

    2015-07-01

    The temperature dependences of nuclear magnetic resonance (NMR) and magic angle spinning (MAS) NMR spectra of {sup 23}Na nuclei in natrolite (Na{sub 2}Al{sub 2}Si{sub 3}O{sub 10} . 2H{sub 2}O) have been studied. The temperature dependences of the spin-lattice relaxation times T{sub 1} in natrolite have also been studied. It has been shown that the spin-lattice relaxation of the {sup 23}Na is governed by the electric quadrupole interaction with the crystal electric field gradients modulated by translational motion of H{sub 2}O molecules in the natrolite pores. The dipolar interactions with paramagnetic impurities become significant as a relaxation mechanism of the {sup 23}Na nuclei only at low temperature (<270 K).

  12. {sup 23}Na-MRI of recurrent glioblastoma multiforme after intraoperative radiotherapy: technical note

    Energy Technology Data Exchange (ETDEWEB)

    Haneder, Stefan; Buesing, Karen A.; Schoenberg, Stefan O.; Ong, Melissa M. [Heidelberg University, Institute of Clinical Radiology and Nuclear Medicine, University Medical Center Mannheim, Medical Faculty Mannheim, Mannheim (Germany); Giordano, Frank A.; Wenz, Frederik [University of Heidelberg, Department of Radiation Oncology, University Medical Center Mannheim, Mannheim (Germany); Konstandin, Simon; Schad, Lothar R. [Heidelberg University, Computer Assisted Clinical Medicine, Mannheim (Germany); Brehmer, Stefanie; Schmiedek, Peter [Heidelberg University, Department of Neurosurgery, University Medical Center Mannheim, Mannheim (Germany)

    2015-03-01

    We report the first case of an intraoperative radiotherapy (IORT) in a patient with recurrent glioblastoma multiforme (GBM) who was followed up with a novel magnetic resonance imaging (MRI) method - {sup 23}Na-MRI - in comparison to a standard contrast-enhanced {sup 1}H-MRI and {sup 18}F-FET-PET. A 56-year-old female patient with diagnosed GBM in July 2012 underwent tumor resection, radiochemotherapy, and three cycles of chemotherapy. After a relapse, 6 months after the initial diagnosis, an IORT was recommended which was performed in March 2013 using the INTRABEAM system (Carl Zeiss Meditec AG, Germany) with a 3-cm applicator and a surface dose of 20 Gy. Early post-operative contrast-enhanced and 1-month follow-up {sup 1}H-MRI and a {sup 18}F-FET-PET were performed. In addition, an IRB-approved {sup 23}Na-MRI was performed on a 3.0-T MR scanner (MAGNETOM TimTrio, Siemens Healthcare, Germany). After re-surgery and IORT in March 2013, only a faint contrast enhancement but considerable surrounding edema was visible at the medio-posterior resection margins. In April 2013, new and progressive contrast enhancement, edema, {sup 23}Na content, and increased uptake in the {sup 18}F-FET-PET were visible, indicating tumor recurrence. Increased sodium content within the area of contrast enhancement was found in the {sup 23}Na-MRI, but also exceeding this area, very similar to the increased uptake depicted in the {sup 18}F-FET-PET. The clearly delineable zone of edema in both examinations exhibits a lower {sup 23}Na content compared to areas with suspected proliferating tumor tissue. {sup 23}Na-MRI provided similar information in the suspicious area compared to {sup 18}F-FET-PET, exceeding conventional {sup 1}H-MRI. Still, {sup 23}Na-MRI remains an investigational technique, which is worth to be further evaluated. (orig.)

  13. Bilateral {sup 23}Na MR imaging of the breast and quantification of sodium concentration; Bilaterale {sup 23}Na-MR-Bildgebung der Mamma und Quantifizierung der Natriumkonzentration

    Energy Technology Data Exchange (ETDEWEB)

    Danisch, Meike; Kalayciyan, Raffi; Schad, Lothar R. [Heidelberg Univ., Mannheim (Germany). Computerunterstuetzte Klinische Medizin; Wetterling, Friedrich [Trinity College Dublin (Ireland)

    2014-03-01

    A novel setup for {sup 23}Na MRI, which allows bilateral imaging of the breast, is presented. For this purpose a figure-eight receive-only {sup 23}Na surface coil was developed. For our experiments on three samples with NaCl solutions of different sodium concentrations and two female subjects we used an asymmetric birdcage coil in transmit mode and the developed surface coil for receiving the signal at 3 T. Imaging of the samples showed the applicability of the employed normalization method for measuring the distribution of sodium concentration. In a sample of concentration [Na{sup +}] = 51 mM we achieved SNR = 70 at a nominal isotropic resolution of 2,5 mm (T{sub R} = 66 ms, T{sub E} = 0,6 ms, T{sub A} = 20 min). Furthermore we showed that by means of this setup it is possible to quantify the sodium concentration in breast tissue (TSC) of a female subject with an accuracy of 23% (T{sub R} = 150 ms, T{sub E} = 0,5 ms, T{sub A} = 45 min). (orig.)

  14. Consistent Data Assimilation of Structural Isotopes: 23Na and 56Fe

    Energy Technology Data Exchange (ETDEWEB)

    Giuseppe Palmiotti

    2010-09-01

    A new approach is proposed, the consistent data assimilation, that allows to link the integral data experiment results to basic nuclear parameters employed by evaluators to generate ENDF/B point energy files in order to improve them. Practical examples are provided for the structural materials 23Na and 56Fe. The sodium neutron propagation experiments, EURACOS and JANUS-8, are used to improve via modifications of 23Na nuclear parameters (like scattering radius, resonance parameters, Optical model parameters, Statistical Hauser-Feshbach model parameters, and Preequilibrium Exciton model parameters) the agreement of calculation versus experiments for a series of measured reaction rate detectors slopes. For the 56Fe case the EURACOS and ZPR3 assembly 54 are used. Results have shown inconsistencies in the set of nuclear parameters used so that further investigation is needed. Future work involves comparison of results against a more traditional multigroup adjustments, and extension to other isotope of interest in the reactor community.

  15. Ultracold Dipolar Gas of Fermionic 23Na40 K Molecules in Their Absolute Ground State.

    Science.gov (United States)

    Park, Jee Woo; Will, Sebastian A; Zwierlein, Martin W

    2015-05-22

    We report on the creation of an ultracold dipolar gas of fermionic 23Na40 K molecules in their absolute rovibrational and hyperfine ground state. Starting from weakly bound Feshbach molecules, we demonstrate hyperfine resolved two-photon transfer into the singlet X 1Σ+|v=0,J=0⟩ ground state, coherently bridging a binding energy difference of 0.65 eV via stimulated rapid adiabatic passage. The spin-polarized, nearly quantum degenerate molecular gas displays a lifetime longer than 2.5 s, highlighting NaK's stability against two-body chemical reactions. A homogeneous electric field is applied to induce a dipole moment of up to 0.8 D. With these advances, the exploration of many-body physics with strongly dipolar Fermi gases of 23Na40K molecules is within experimental reach.

  16. The 23Na({\\alpha},p) 26Mg reaction rate at astrophysically relevant energies

    CERN Document Server

    Howard, A M; Fynbo, H O U; Kirsebom, O S; Laursen, K L; Diget, C Aa; Hubbard, N J

    2015-01-01

    The production of 26 Al in massive stars is sensitive to the 23 Na(a,p) 26 Mg cross section. Recent experimental data suggest the currently recommended cross sections are underestimated by a factor of 40. We present here differential cross sections for the 23 Na(a,p) 26 Mg reaction measured in the energy range E c.m. = 1.7 - 2.5 MeV. Concurrent measurements of Rutherford scattering provide absolute normalisations which are independent of variations in target properties. Angular distributions were measured for both p 0 and p 1 permitting the determination of total cross sections. The results show no significant deviation from the statistical model calculations upon which the recommended rates are based. We therefore retain the previous recommendation without the increase in cross section and resulting stellar reaction rates of a factor of 40, impacting on the 26 Al yield from massive stars by more than a factor of three.

  17. Production of a nuclear spin polarized /sup 23/Na-beam by optical pumping

    Energy Technology Data Exchange (ETDEWEB)

    Dreves, W.; Kamke, W.; Broermann, W.; Fick, D.

    1981-11-01

    Nuclear spin polarization of an atomic /sup 23/Na-beam was produced by a combination of optical pumping with a dye laser and a sextupole magnet and alternatively, by optical pumping with two dye lasers. The maximum value measured for the vector polarization was P/sub 2/ = 0.86 +- 0.08, using beam foil spectroscopy. Further improvements of polarized ion sources based on this principle are discussed.

  18. Three new low-energy resonances in the $^{22}$Ne(p,$\\gamma$)$^{23}$Na reaction

    CERN Document Server

    Cavanna, F; Aliotta, M; Anders, M; Bemmerer, D; Best, A; Böltzig, A; Broggini, C; Bruno, C G; Caciolli, A; Corvisiero, P; Davinson, T; di Leva, A; Elekes, Z; Ferraro, F; Formicola, A; Fülöp, Zs; Gervino, G; Guglielmetti, A; Gustavino, C; Gyürky, Gy; Imbriani, G; Junker, M; Menegazzo, R; Mossa, V; Pantaleo, F R; Prati, P; Scott, D A; Somorjai, E; Straniero, O; Strieder, F; Szücs, T; Takács, M P; Trezzi, D

    2015-01-01

    The $^{22}$Ne(p,$\\gamma$)$^{23}$Na reaction takes part in the neon-sodium cycle of hydrogen burning. This cycle affects the synthesis of the elements between $^{20}$Ne and $^{27}$Al in asymptotic giant branch stars and novae. The $^{22}$Ne(p,$\\gamma$)$^{23}$Na reaction rate is very uncertain because of a large number of unobserved resonances lying in the Gamow window. At proton energies below 400\\,keV, only upper limits exist in the literature for the resonance strengths. Previous reaction rate evaluations differ by large factors. In the present work, the first direct observations of the $^{22}$Ne(p,$\\gamma$)$^{23}$Na resonances at 156.2, 189.5, and 259.7\\,keV are reported. Their resonance strengths have been derived with 2-7\\% uncertainty. In addition, upper limits for three other resonances have been greatly reduced. Data were taken using a windowless $^{22}$Ne gas target and high-purity germanium detectors at the Laboratory for Underground Nuclear Astrophysics in the Gran Sasso laboratory of the National I...

  19. Three New Low-Energy Resonances in the 22Ne (p ,γ )23Na Reaction

    Science.gov (United States)

    Cavanna, F.; Depalo, R.; Aliotta, M.; Anders, M.; Bemmerer, D.; Best, A.; Boeltzig, A.; Broggini, C.; Bruno, C. G.; Caciolli, A.; Corvisiero, P.; Davinson, T.; di Leva, A.; Elekes, Z.; Ferraro, F.; Formicola, A.; Fülöp, Zs.; Gervino, G.; Guglielmetti, A.; Gustavino, C.; Gyürky, Gy.; Imbriani, G.; Junker, M.; Menegazzo, R.; Mossa, V.; Pantaleo, F. R.; Prati, P.; Scott, D. A.; Somorjai, E.; Straniero, O.; Strieder, F.; Szücs, T.; Takács, M. P.; Trezzi, D.; LUNA Collaboration

    2015-12-01

    The 22Ne (p ,γ )23Na reaction takes part in the neon-sodium cycle of hydrogen burning. This cycle affects the synthesis of the elements between 20Ne and 27Al in asymptotic giant branch stars and novae. The 22Ne(p ,γ )23Na reaction rate is very uncertain because of a large number of unobserved resonances lying in the Gamow window. At proton energies below 400 keV, only upper limits exist in the literature for the resonance strengths. Previous reaction rate evaluations differ by large factors. In the present work, the first direct observations of the 22Ne (p ,γ )23Na resonances at 156.2, 189.5, and 259.7 keV are reported. Their resonance strengths are derived with 2%-7% uncertainty. In addition, upper limits for three other resonances are greatly reduced. Data are taken using a windowless 22Ne gas target and high-purity germanium detectors at the Laboratory for Underground Nuclear Astrophysics in the Gran Sasso laboratory of the National Institute for Nuclear Physics, Italy, taking advantage of the ultralow background observed deep underground. The new reaction rate is a factor of 20 higher than the recent evaluation at a temperature of 0.1 GK, relevant to nucleosynthesis in asymptotic giant branch stars.

  20. New measurements of low-energy resonances in the 22Ne(p ,γ )23Na reaction

    Science.gov (United States)

    Kelly, K. J.; Champagne, A. E.; Downen, L. N.; Dermigny, J. R.; Hunt, S.; Iliadis, C.; Cooper, A. L.

    2017-01-01

    The 22Ne(p ,γ )23Na reaction is one of the most uncertain reactions in the NeNa cycle and plays a crucial role in the creation of 23Na, the only stable Na isotope. Uncertainties in the low-energy rates of this and other reactions in the NeNa cycle lead to ambiguities in the nucleosynthesis predicted from models of thermally pulsing asymptotic giant branch (AGB) stars. This in turn complicates the interpretation of anomalous Na-O trends in globular cluster evolutionary scenarios. Previous studies of the 22Ne(p ,γ )23Na , 22Ne(3He,d )23Na , and 12C(12C,p )23Na reactions disagree on the strengths, spins, and parities of low-energy resonances in 23Na and the direct-capture 22Ne(p ,γ )23Na reaction rate contains large uncertainties as well. In this work we present new measurements of resonances at Erc.m.=417 , 178, and 151 keV and of the direct-capture process in the 22Ne(p ,γ )23Na reaction. The resulting total 22Ne(p ,γ )23Na rate is approximately a factor of 20 higher than the rate listed in a recent compilation at temperatures relevant to hot-bottom burning in AGB stars. Although our rate is close to that derived from a recent 22Ne(p ,γ )23Na measurement by Cavanna et al. in 2015, we find that this large rate increase results in only a modest 18% increase in the 23Na abundance predicted from a 5 M⊙ thermally pulsing AGB star model from Ventura and D'Antona (2005). The estimated astrophysical impact of this rate increase is in marked contrast to the factor of ˜3 increase in 23Na abundance predicted by Cavanna et al. and is attributed to the interplay between the 23Na(p ,α )20Ne and 20Ne(p ,γ )21Na reactions, both of which remain fairly uncertain at the relevant temperature range.

  1. 23Na and 1H NMR Relaxometry of Shale at High Magnetic Field

    CERN Document Server

    Yang, Donghan

    2016-01-01

    Formation evaluation of unconventional reservoirs is challenging due to the coexistence of different phases such as kerogen, bitumen, movable and bound light hydrocarbon and water. Current low-frequency (0.05 T) nuclear magnetic resonance (NMR) laboratory and logging methods are incapable of quantitatively separating the different phases. We demonstrate the utility of high-field (9 T) NMR 2D T1-T2 measurements for separating hydrocarbon and the clay-interacting aqueous phases in shale based on the difference in the frequency dependence of the spin-lattice relaxation time. Furthermore, we demonstrate 23Na NMR as a promising complementary technique to conventional 1H NMR for shale fluid typing, taking advantage of the fact that sodium ions are only present in the aqueous phase. We validate high-field (9 T) 23Na-1H NMR relaxometry for assessing brine-filled porosity and brine salinity in various porous materials, including porous glass, conventional rocks, clays, and shale, and apply it for differentiating hydro...

  2. Direct measurement of low-energy $^{22}$Ne(p,$\\gamma$)$^{23}$Na resonances

    CERN Document Server

    Depalo, R; Aliotta, M; Anders, M; Bemmerer, D; Best, A; Boeltzig, A; Broggini, C; Bruno, C G; Caciolli, A; Ciani, G F; Corvisiero, P; Davinson, T; Di Leva, A; Elekes, Z; Ferraro, F; Formicola, A; Fülöp, Zs; Gervino, G; Guglielmetti, A; Gustavino, C; Gyürky, Gy; Imbriani, G; Junker, M; Menegazzo, R; Mossa, V; Pantaleo, F R; Piatti, D; Prati, P; Straniero, O; Szücs, T; Takács, M P; Trezzi, D

    2016-01-01

    The $^{22}$Ne(p,$\\gamma$)$^{23}$Na reaction is the most uncertain process in the neon-sodium cycle of hydrogen burning. At temperatures relevant for nucleosynthesis in asymptotic giant branch stars and classical novae, its uncertainty is mainly due to a large number of predicted but hitherto unobserved resonances at low energy. Purpose: A new direct study of low energy $^{22}$Ne(p,$\\gamma$)$^{23}$Na resonances has been performed at the Laboratory for Underground Nuclear Astrophysics (LUNA), in the Gran Sasso National Laboratory, Italy. Method: The proton capture on $^{22}$Ne was investigated in direct kinematics, delivering an intense proton beam to a $^{22}$Ne gas target. $\\gamma$ rays were detected with two high-purity germanium detectors enclosed in a copper and lead shielding suppressing environmental radioactivity. Results: Three resonances at 156.2 keV ($\\omega\\gamma$ = (1.48\\,$\\pm$\\,0.10)\\,$\\cdot$\\,10$^{-7}$ eV), 189.5 keV ($\\omega\\gamma$ = (1.87\\,$\\pm$\\,0.06)\\,$\\cdot$\\,10$^{-6}$ eV) and 259.7 keV ($\\o...

  3. 23Na-Magnetresonanzspektroskopie-Untersuchungen zum Verlauf der Narbenentwicklung nach Myokardinfarkt

    Directory of Open Access Journals (Sweden)

    Scheffer H

    2001-01-01

    Full Text Available Magnetresonanzspektroskopie (MRS erlaubt die nichtinvasive Untersuchung der Konzentrationen von Stoffwechselprodukten und Ionen im Herzen. Der Gesamtnatrium (Na-Gehalt könnte für die Untersuchung der Vitalität von Myokardgewebe verwendet werden, jedoch gibt es keine Berichte über die Entwicklung des Na-Gehalts in der chronischen Infarktnarbe im Vergleich zum normalen Myokard. Die vorliegende Studie untersucht die Änderungen des myokardialen Na-Gehalts während der Narbenentwicklung nach einem Myokardinfarkt (MI am Modell der Koronarligatur in der Ratte. Ratten wurden einer Ligatur des Ramus intraventricularis anterior unterzogen. Myokardgewebe von Kontrolltieren sowie infarziertes Gewebe wurden 1, 3, 7, 28 und 56 Tage postoperativ entnommen und der Na-Gehalt mittels 23Na-MRS und Ionenchromatographie bestimmt. Der Na-Gehalt nach MI war zu allen Zeitpunkten bei beiden Bestimmungsmethoden auf Werte zwischen 306 und 160 % des Kontrollwertes erhöht (n = 6-8 je Gruppe, p 0,01 vs. Kontrolle. Der Na-Gehalt ist im chronisch infarzierten Myokardgewebe zu allen Zeitpunkten erhöht. Damit kann überlebendes Myokard von einer Infarktnarbe anhand des Na-Gehalts unterschieden werden. Diese Information könnte in der 23Na-Magnetresonanzbildgebung (MRI zur Bestimmung der Infarktnarbe eine klinische Anwendung finden.

  4. Na+ deposition in the fibrotic skin of systemic sclerosis patients detected by 23Na-magnetic resonance imaging.

    Science.gov (United States)

    Kopp, Christoph; Beyer, Christian; Linz, Peter; Dahlmann, Anke; Hammon, Matthias; Jantsch, Jonathan; Neubert, Patrick; Rosenhauer, Daniela; Müller, Dominik N; Cavallaro, Alexander; Eckardt, Kai-Uwe; Schett, Georg; Luft, Friedrich C; Uder, Michael; Distler, Jörg H W; Titze, Jens

    2017-04-01

    Skin fibrosis is the predominant feature of SSc and arises from excessive extracellular matrix deposition. Glycosaminoglycans are macromolecules of the extracellular matrix, which facilitate Na + accumulation in the skin. We used 23 Na-MRI to quantify Na + in skin. We hypothesized that skin Na + might accumulate in SSc and might be a biomarker for skin fibrosis. In this observational case-control study, skin Na + was determined by 23 Na-MRI using a Na + volume coil in 12 patients with diffuse cutaneous SSc and in 21 control subjects. We assessed skin fibrosis by the modified Rodnan skin score prior to 23 Na-MRI and on follow-up 12 months later. 23 Na-MRI demonstrated increased Na + in the fibrotic skin of SSc patients compared with skin from controls [mean ( s . d .): 27.2 (5.6) vs 21.4 (5.3) mmol/l, P skin [26.2 (4.8) vs 19.2 (3.4) mmol/l, P skin Na + amount was correlated with changes in follow-up modified Rodnan skin score (R 2 = 0.68). 23 Na-MRI detected increased Na + in the fibrotic SSc skin; high Na + content was associated with progressive skin disease. Our findings provide the first evidence that 23 Na-MRI might be a promising tool to assess skin Na + and thereby predict progression of skin fibrosis in SSc.

  5. Functional MRI 2.0. {sup 23}Na and CEST imaging; Funktionelle MRT 2.0. {sup 23}Na- und CEST-Bildgebung

    Energy Technology Data Exchange (ETDEWEB)

    Haneder, S. [Uniklinik Koeln, Institut fuer Diagnostische und Interventionelle Radiologie, Koeln (Germany); Konstandin, S. [Universitaet Bremen, MR-Bildgebung und -Spektroskopie, Fachbereich 1 (Physik/Elektrotechnik), Bremen (Germany); Fraunhofer MEVIS, Institut fuer Bildgestuetzte Medizin, Bremen (Germany)

    2016-02-15

    In recent years the purely morphological magnetic resonance imaging (MRI) has been increasingly flanked by so-called functional imaging methods, such as diffusion-weighted imaging (DWI), to obtain additional information about tissue or pathological processes. This review article presents two MR techniques that can detect physiological processes in the human body. In contrast to all other functional MR imaging techniques, which are based on hydrogen protons, the first technique presented (X-nuclei imaging) uses the spin of other nuclei for imaging and consequently allows a completely different insight into the human body. In this article X-nuclei imaging is focused on sodium ({sup 23}Na) MRI because it currently represents the main focus of research in this field due to the favorable MR properties of sodium. The second MR technique presented is the relatively novel chemical exchange saturation transfer (CEST) imaging that can detect exchange processes between protons in metabolites and protons in free water. The first part of this article introduces the basic technical principles, problems, advantages and disadvantages of these two MR techniques, whereas the second part highlights the potential clinical applications. Examples illustrate several potential applications in neuroimaging (e. g. stroke and tumors), musculoskeletal imaging (e. g. osteoarthritis and degenerative processes) and abdominal imaging (e. g. kidneys and hypertension). Both techniques inherently contain an incredible potential for future imaging but are still on the threshold of clinical use and are currently under evaluation in many university centers. (orig.) [German] In den letzten Jahren wird die reine morphologische Magnetresonanztomographie (MRT) zunehmend von sogenannten funktionellen Bildgebungsmethoden, wie der diffusionsgewichteten Bildgebung (''diffusion-weighted imaging'', DWI), flankiert, um zusaetzliche Informationen ueber Gewebe oder pathologische Prozesse zu

  6. Application of potential harmonic expansion method to BEC: Thermodynamic properties of trapped 23Na atoms

    Indian Academy of Sciences (India)

    Anasuya Kundu; Barnali Chakrabarti; Tapan Kumar Das

    2005-07-01

    We adopt the potential harmonics expansion method for an ab initio solution of the many-body system in a Bose condensate containing interacting bosons. Unlike commonly adopted mean-field theories, our method is capable of handling two-body correlation properly. We disregard three- and higher-body correlations. This simplification is ideally suited to dilute Bose Einstein condensates, whose number density is required to be so small that the interparticle separation is much larger than the range of two-body interaction to avoid three- and higher-body collisions, leading to the formation of molecules and consequent instability of the condensate. In our method we can incorporate realistic finite range interactions. We calculate energies of low-lying states of a condensate containing 23Na atoms and some thermodynamical properties of the condensate.

  7. Electrocautery versus 23% NaOH infiltration to induce subglottic stenosis in a canine experimental model.

    Science.gov (United States)

    Hanauer, Aline D; Fraga, Jose Carlos; Sousa, Joao K; Sanches, Paulo R; Duarte, Marcos E; Ulbrich-Kulczynski, Jane; Filho, Orlando H; Saueressig, Mauricio G

    2007-12-01

    Subglottic stenosis (SGS) is defined as the narrowing of the lower larynx. Difficulties in the management of subglottic stenosis, especially in the pediatric population, justify the development of experimental models. The objective of this study was to compare the two methods of experimental subglottic stenosis induction. Twenty-three dogs were randomly selected and assigned by lottery to either one of the two groups: Gp I (n = 10) of electrocoagulation; and Gp II (n = 13) of 23% NaOH injection. In Gp I, self-interruption electrocoagulation was applied to one point in each of the four quadrants of the cricoid cartilage. In Gp II, 0.2 ml of 23% NaOH was injected in the submucosal layer in the anterior and posterior portions of the cricoid cartilage. Once a week, endoscopy was performed and the caliber of the subglottic region was measured using endotracheal tubes, and the injection was repeated if there were no signs of subglottic stenosis. The animals were killed on day 21; animals that developed respiratory distress were killed before day 21. One animal in Gp I died on day 14 after the injection and during transportation; two animals in Gp II died, one on day 7 due to a tracheoesophageal fistula, and the other of unknown causes on day 5. Significant subglottic stenosis (over 51% obstruction) was found in 67% of the animals in Gp I and in 64% of those in Gp II (P = 0.99). Median time to development of significant stenosis was 21 days in both groups, and required either two or three injections. Mean time for the performance of the procedures was significantly shorter (P subglottic stenosis in dogs, both methods leading to stenosis in the same period of time and after the same number of procedures. However, electrocoagulation was the fastest method.

  8. 39K, 23Na, and 31P NMR Studies of Ion Transport in Saccharomyces cerevisiae

    Science.gov (United States)

    Ogino, T.; den Hollander, J. A.; Shulman, R. G.

    1983-09-01

    The relationship between efflux and influx of K+, Na+, and intracellular pH (pHin) in yeast cells upon energizing by oxygenation was studied by using the noninvasive technique of 39K, 23Na, and 31P NMR spectroscopy. By introducing an anionic paramagnetic shift reagent, Dy3+(P3O105-)2, into the medium, NMR signals of intra- and extracellular K+ and Na+ could be resolved, enabling us to study ion transport processes by NMR. Measurements showed that 40% of the intracellular K+ and Na+ in yeast cells contributed to the NMR intensities. By applying this correction factor, the intracellular ion concentrations were determined to be 130-170 mM K+ and 2.5 mM Na+ for fresh yeast cells. With the aid of a home-built solenoidal coil probe for 39K and a double-tuned probe for 23Na and 31P, we could follow time courses of K+ and Na+ transport and of pHin with a time resolution of 1 min. It was shown that H+ extrusion is correlated with K+ uptake and not with Na+ uptake upon energizing yeast cells by oxygenation. When the cells were deenergized after the aerobic period, K+ efflux, H+ influx, and Na+ influx were calculated to be 1.6, 1.5, and 0.15 μ mol/min per ml of cell water, respectively. Therefore, under the present conditions, K+ efflux is balanced by exchange for H+ with an approximate stoichiometry of 1:1.

  9. Optimized cartilage visualization using 7-T sodium ((23)Na) imaging after patella dislocation.

    Science.gov (United States)

    Widhalm, Harald K; Apprich, Sebastian; Welsch, Goetz H; Zbyn, Stefan; Sadoghi, Patrick; Vekszler, György; Hamböck, Martina; Weber, Michael; Hajdu, Stefan; Trattnig, Siegfried

    2016-05-01

    Retropatellar cartilage lesions often occur in the course of recurrent patella dislocation. Aim of this study was to develop a more detailed method for examining cartilage tissue, in order to reduce patient discomfort and time of care. For detailed diagnosing, a 7-T MRI of the knee joint and patella was performed in nine patients, with mean age of 26.4 years, after patella dislocation to measure the cartilage content in three different regions of interest of the patella. Axial sodium ((23)Na) images were derived from an optimized 3D GRE sequence on a 7-T MR scanner. Morphological cartilage grading was performed, and sodium signal-to-noise ratio (SNR) values were calculated. Mean global sodium values and SNR were compared between patients and volunteers. Two out of nine patients showed a maximum cartilage defect of International Cartilage Repair Society (ICRS) grade 3, three of grade 2, three of  grade 1, and one patient showed no cartilage defect. The mean SNR in sodium images for cartilage was 13.4 ± 2.5 in patients and 14.6 ± 3.7 in volunteers (n.s.). A significant negative correlation between age and global sodium SNR for cartilage was found in the medial facet (R = -0.512; R (2) = 0.26; p = 0.030). Mixed-model ANOVA yielded a marked decrease of the sodium SNR, with increasing grade of cartilage lesions (p < 0.001). Utilization of the (23)Na MR imaging will make earlier detection of alterations to the patella cartilage after dislocation possible and will help prevent subsequent disease due to start adequate therapy earlier in the rehabilitation process. II.

  10. Hyperkalemic periodic paralysis and permanent weakness: 3-T MR imaging depicts intracellular 23Na overload--initial results.

    Science.gov (United States)

    Amarteifio, Erick; Nagel, Armin M; Weber, Marc-André; Jurkat-Rott, Karin; Lehmann-Horn, Frank

    2012-07-01

    To assess whether myoplasmic ionic sodium (Na+) is increased in muscles of patients with hyperkalemic periodic paralysis (HyperPP) with 3-T sodium 23 (23Na) magnetic resonance (MR) imaging and to evaluate the effect of medical treatment on sodium-induced muscle edema. This study received institutional review board approval; written informed consent was obtained. Proton (hydrogen 1 [1H]) and 23Na MR of both calves were performed in 12 patients with HyperPP (mean age, 48 years±14 [standard deviation]) and 12 healthy volunteers (mean age, 38 years±12) before and after provocation (unilateral cooling, one calf). 23Na MR included spin-density, T1-weighted, and inversion-recovery (IR) sequences. Total sodium concentration and normalized signal intensities (SIs) were evaluated within regions of interest (ROIs). Muscle strength was measured with the British Medical Research Council (MRC) grading scale. Five patients underwent follow-up MR after diuretic treatment. During rest, mean myoplasmic Na+ concentration was significantly higher in HyperPP with permanent weakness (40.7 μmol/g±3.9) compared with HyperPP with transient weakness (31.3 μmol/g±4.8) (P=.004). Mean SI in 23Na IR MR was significantly higher in HyperPP with permanent weakness (0.83±0.04; median MRC, grade 4; range, 3-5) compared with HyperPP without permanent weakness (0.67±0.05; median MRC, grade 5; range, 4-5) (P=.002). Provocation reduced muscle strength in HyperPP (before provocation, median MRC, 5; range, 3-5; after provocation, median MRC, 3; range, 1-4) and increased SI in 23Na IR from 0.75±0.09 to 0.86±0.10 (P=.004). Spin-density and T1-weighted sequences were less sensitive, particularly to cold-induced Na+ changes. 23Na IR SI remained unchanged in volunteers (0.53±0.06 before and 0.54±0.06 after provocation, P=.3). Therapy reduced mean SI in 23Na IR sequence from 0.85±0.04 to 0.64±0.11. 23Na MR imaging depicts increased myoplasmic Na+ in HyperPP with permanent weakness. Na+ overload

  11. Dose-dependent changes in renal {sup 1}H-/{sup 23}Na MRI after adjuvant radiochemotherapy for gastric cancer

    Energy Technology Data Exchange (ETDEWEB)

    Haneder, Stefan [University Medical Centre Mannheim, University of Heidelberg, Institute of Clinical Radiology and Nuclear Medicine, Mannheim (Germany); University Hospital of Cologne, Department of Radiology, Cologne (Germany); Budjan, Johannes Michael; Schoenberg, Stefan Oswald [University Medical Centre Mannheim, University of Heidelberg, Institute of Clinical Radiology and Nuclear Medicine, Mannheim (Germany); Konstandin, Simon; Schad, Lothar Rudi [University Medical Centre Mannheim, University of Heidelberg, Computer Assisted Clinical Medicine, Mannheim (Germany); Hofheinz, Ralf Dieter [University Medical Centre Mannheim, University of Heidelberg, III. Department of Internal Medicine, Mannheim (Germany); Gramlich, Veronika; Wenz, Frederik; Lohr, Frank; Boda-Heggemann, Judit [University Medical Centre Mannheim, Medical Faculty Mannheim - University of Heidelberg, Department of Radiation Oncology, Mannheim (Germany)

    2015-04-01

    Combined radiochemotherapy (RCT) for gastric cancer with three-dimensional conformal radiotherapy (3D-CRT) results in ablative doses to the upper left kidney, while image-guided intensity-modulated radiotherapy (IG-IMRT) allows kidney sparing despite improved target coverage. Renal function in long-term gastric cancer survivors was evaluated with 3T functional magnetic resonance imaging (MRI) including diffusion-weighted imaging (DWI) and {sup 23}Na imaging. Five healthy volunteers and 13 patients after radiotherapy were included: 11 x IG-IMRT; 1 x 3D-CRT; 1 x ''positive control'' with stereotactic body radiotherapy (SBRT) of a metastasis between the spleen/left kidney. Radiation doses were documented for the upper/middle/lower kidney subvolumes. Late toxicity was evaluated based on CTC criteria, questionnaire, and creatinine values. Morphological sequences, DWI images, and {sup 23}Na images were acquired using a {sup 1}H/{sup 23}Na-tuned body-coil before/after intravenous water load (WL). Statistics for [{sup 23}Na] (concentration) and apparent diffusion coefficient (ADC) values were calculated for upper/middle/lower renal subvolumes. Corticomedullary [{sup 23}Na] gradients and [{sup 23}Na] differences after WL were determined. No major morphological alteration was detected in any patient. Minor scars were observed in the cranial subvolume of the left kidney of the 3D-CRT and the whole kidney of the control SBRT patient. All participants presented a corticomedullary [{sup 23}Na] gradient. After WL, a significant physiological [{sup 23}Na] gradient decrease (p < 0.001) was observed in all HV and IG-IMRT patients. In the cranial left kidney of the 3D-CRT patient and the positive control SBRT patient, the decrease was nonsignificant (p = 0.01, p = 0.02). ADC values were altered nonsignificantly in all renal subvolumes (all participants). Renal subvolumes with doses ≥ 35 Gy showed a reduced change of the [{sup 23}Na] gradient after WL (p = 0

  12. Measurement of (23)Na(n,2n) cross section in well-defined reactor spectra.

    Science.gov (United States)

    Košťál, Michal; Švadlenková, Marie; Baroň, Petr; Milčák, Ján; Mareček, Martin; Uhlíř, Jan

    2016-05-01

    The present paper aims to compare the calculated and experimental reaction rates of (23)Na(n,2n)(22)Na in a well-defined reactor spectra of a special core assembled in the LR-0 reactor. The experimentally determined reaction rate, derived using gamma spectroscopy of irradiated NaF sample, is used for average cross section determination. The resulting value averaged in spectra is 0.91±0.02µb. This cross-section is important as it is included in International Reactor Dosimetry and Fusion File and is also relevant to the correct estimation of long-term activity of Na coolant in Sodium Fast Reactors. The calculations were performed with the MCNP6 code using ENDF/B-VII.0, JEFF-3.1, JEFF-3.2, JENDL-3.3, JENDL-4, ROSFOND-2010 and CENDL-3.1 nuclear data libraries. Generally the best C/E agreement, within 2%, was found using the ROSFOND-2010 data set, whereas the worst, as high as 40%, was found using the ENDF/B-VII.0.

  13. High resolution measurement of neutron inelastic scattering cross-sections for 23Na

    Science.gov (United States)

    Rouki, C.; Archier, P.; Borcea, C.; De Saint Jean, C.; Drohé, J. C.; Kopecky, S.; Moens, A.; Nankov, N.; Negret, A.; Noguère, G.; Plompen, A. J. M.; Stanoiu, M.

    2012-04-01

    The neutron inelastic scattering cross-section of 23Na has been measured in response to the relevant request of the OECD-NEA High Priority Request List, which requires a target uncertainty of 4% in the energy range up to 1.35 MeV for the development of sodium-cooled fast reactors. The measurement was performed at the GELINA facility with the Gamma Array for Inelastic Neutron Scattering (GAINS), featuring eight high purity germanium detectors. The setup is installed at a 200 m flight path from the neutron source and provides high resolution measurements using the (n,n'γ)-technique. The sample was an 80 mm diameter metallic sodium disk prepared at IRMM. Transitions up to the seventh excited state were observed and the differential gamma cross-sections at 110° and 150° were measured, showing mostly isotropic gamma emission. From these the gamma production, level and inelastic cross-sections were determined for neutron energies up to 3838.9 keV. The results agree well with the existing data and the evaluated nuclear data libraries in the low energies, and provide new experimental points in the little studied region above 2 MeV. Following a detailed review of the methodology used for the gamma efficiency calibrations and flux normalization of GAINS data, an estimated total uncertainty of 2.2% was achieved for the inelastic cross-section integrals over the energy ranges 0.498-1.35 MeV and 1.35-2.23 MeV, meeting the required targets.

  14. Interface Induced Growth and Transformation of Polymer-Conjugated Proto-Crystalline Phases in Aluminosilicate Hybrids: A Multiple-Quantum (23)Na-(23)Na MAS NMR Correlation Spectroscopy Study.

    Science.gov (United States)

    Brus, Jiri; Kobera, Libor; Urbanova, Martina; Doušová, Barbora; Lhotka, Miloslav; Koloušek, David; Kotek, Jiří; Čuba, Pavel; Czernek, Jiri; Dědeček, Jiří

    2016-03-22

    Nanostructured materials typically offer enhanced physicochemical properties because of their large interfacial area. In this contribution, we present a comprehensive structural characterization of aluminosilicate hybrids with polymer-conjugated nanosized zeolites specifically grown at the organic-inorganic interface. The inorganic amorphous Al-O-Si framework is formed by alkali-activated low-temperature transformation of metakaoline, whereas simultaneous copolymerization of organic comonomers creates a secondary epoxide network covalently bound to the aluminosilicate matrix. This secondary epoxide phase not only enhances the mechanical integrity of the resulting hybrids but also introduces additional binding sites accessible for compensating negative charge on the aluminosilicate framework. This way, the polymer network initiates growth and subsequent transformation of protocrystalline short-range ordered zeolite domains that are located at the organic-inorganic interface. By applying an experimental approach based on 2D (23)Na-(23)Na double-quantum (DQ) MAS NMR spectroscopy, we discovered multiple sodium binding sites in these protocrystalline domains, in which immobilized Na(+) ions form pairs or small clusters. It is further demonstrated that these sites, the local geometry of which allows for the pairing of sodium ions, are preferentially occupied by Pb(2+) ions during the ion exchange. The proposed synthesis protocol thus allows for the preparation of a novel type of geopolymer hybrids with polymer-conjugated zeolite phases suitable for capturing and storage of metal cations. The demonstrated (23)Na-(23)Na DQ MAS NMR combined with DFT calculations represents a suitable approach for understanding the role of Na(+) ions in aluminositicate solids and related inorganic-organic hybrids, particularly their specific arrangement and clustering at interfacial areas.

  15. Quantitative sodium MR imaging of native versus transplanted kidneys using a dual-tuned proton/sodium ({sup 1}H/{sup 23}Na) coil: initial experience

    Energy Technology Data Exchange (ETDEWEB)

    Moon, Chan Hong; Furlan, Alessandro [University of Pittsburgh, Department of Radiology, Pittsburgh, PA (United States); Kim, Jung-Hwan; Bae, Kyongtae Ty [University of Pittsburgh, Department of Radiology, Pittsburgh, PA (United States); University of Pittsburgh, Department of Bioengineering, Pittsburgh, PA (United States); Zhao, Tiejun [MR R and D Collaborations, Siemens Medical Solutions USA, Inc, Pittsburgh, PA (United States); Shapiro, Ron [Thomas E. Starzl Transplantation Institute, Department of Surgery, Pittsburgh, PA (United States)

    2014-06-15

    To compare sodium ({sup 23}Na) characteristics between native and transplanted kidneys using dual-tuned proton ({sup 1}H)/sodium MRI. Six healthy volunteers and six renal transplant patients (3 normal function, 3 acute allograft rejection) were included. Proton/sodium MRI was obtained at 3 T using a dual-tuned coil. Signal to noise ratio (SNR), sodium concentration ([{sup 23}Na]) and cortico-medullary sodium gradient (CMSG) were measured. Reproducibility of [{sup 23}Na] measurement was also tested. SNR, [{sup 23}Na] and CMSG of the native and transplanted kidneys were compared. Proton and sodium images of kidneys were successfully acquired. SNR and [{sup 23}Na] measurements of the native kidneys were reproducible at two different sessions. [{sup 23}Na] and CMSG of the transplanted kidneys was significantly lower than those of the native kidneys: 153.5 ± 11.9 vs. 192.9 ± 9.6 mM (P = 0.002) and 8.9 ± 1.5 vs. 10.5 ± 0.9 mM/mm (P = 0.041), respectively. [{sup 23}Na] and CMSG of the transplanted kidneys with normal function vs. acute rejection were not statistically different. Sodium quantification of kidneys was reliably performed using proton/sodium MRI. [{sup 23}Na] and CMSG of the transplanted kidneys were lower than those of the native kidneys, but without a statistically significant difference between patients with or without renal allograft rejection. (orig.)

  16. Discrimination of intra- and extracellular 23Na + signals in yeast cell suspensions using longitudinal magnetic resonance relaxography

    Science.gov (United States)

    Zhang, Yajie; Poirer-Quinot, Marie; Springer, Charles S.; Balschi, James A.

    2010-07-01

    This study tested the ability of MR relaxography (MRR) to discriminate intra- (Nai+) and extracellular (Nae+)23Na + signals using their longitudinal relaxation time constant ( T1) values. Na +-loaded yeast cell ( Saccharomyces cerevisiae) suspensions were investigated. Two types of compartmental 23Na +T1 differences were examined: a selective Nae+T1 decrease induced by an extracellular relaxation reagent (RR e), GdDOTP 5-; and, an intrinsic T1 difference. Parallel studies using the established method of 23Na MRS with an extracellular shift reagent (SR e), TmDOTP 5-, were used to validate the MRR measurements. With 12.8 mM RR e, the 23Nae+T1 was 2.4 ms and the 23Nai+T1 was 9.5 ms (9.4T, 24 °C). The Na + amounts and spontaneous efflux rate constants were found to be identical within experimental error whether measured by MRR/RR e or by MRS/SR e. Without RR e, the Na +-loaded yeast cell suspension 23Na MR signal exhibited two T1 values, 9.1 (±0.3) ms and 32.7 (±2.3) ms, assigned to 23Nai+ and 23Nae+, respectively. The Nai+ content measured was lower, 0.88 (±0.06); while Nae+ was higher, 1.43 (±0.12) compared with MRS/SR e measures on the same samples. However, the measured efflux rate constant was identical. T1 MRR potentially may be used for Nai+ determination in vivo and Na + flux measurements; with RR e for animal studies and without RR e for humans.

  17. Anatomically weighted second-order total variation reconstruction of 23Na MRI using prior information from 1H MRI.

    Science.gov (United States)

    Gnahm, Christine; Nagel, Armin M

    2015-01-15

    Sodium ((23)Na) MRI is a noninvasive tool to assess cell viability, which is linked to the total tissue sodium concentration (TSC). However, due to low in vivo concentrations, (23)Na MRI suffers from low signal-to-noise ratio (SNR) and limited spatial resolution. As a result, image quality is compromised by Gibbs ringing artifacts and partial volume effects. An iterative reconstruction algorithm that incorporates prior information from (1)H MRI is developed to reduce partial volume effects and to increase the SNR in non-proton MRI. Anatomically weighted second-order total variation (AnaWeTV) is proposed as a constraint for compressed sensing reconstruction of 3D projection reconstruction (3DPR) data. The method is evaluated in simulations and a MR measurement of a multiple sclerosis (MS) patient by comparing it to gridding and other reconstruction techniques. AnaWeTV increases resolution of known structures and reduces partial volume effects. In simulated MR brain data (nominal resolution Δx(3) = 3 × 3 × 3 mm(3)), the intensity error of four small MS lesions was reduced from (6.9 ± 3.8)% (gridding) to (2.8 ± 1.4)% (AnaWeTV with T2-weighted reference images). Compared to gridding, a substantial SNR increase of 130% was found in the white matter of the MS patient. The algorithm is robust against misalignment of the prior information on the order of the (23)Na image resolution. Features without prior information are still reconstructed with high contrast. AnaWeTV allows a more precise quantification of TSC in structures with prior knowledge. Thus, the AnaWeTV algorithm is in particular beneficial for the assessment of tissue structures that are visible in both (23)Na and (1)H MRI.

  18. Experimental study of the {sup 22}Ne(p,{gamma}){sup 23}Na reaction and its implications for novae scenarios

    Energy Technology Data Exchange (ETDEWEB)

    Menzel, Marie-Luise

    2013-08-01

    The {sup 22}Ne(p,{gamma}){sup 23}Na reaction belongs to the catalytic neon-sodium cycle and has an important role in the explosive hydrogen burning. The neon-sodium cycle takes place at temperatures of T = 0.1 - 0.5 GK and is assumed to occur in different astrophysical systems: e.g. in novae, in super novae of type Ia and during the shell-burning of red giant branch stars. The implications of {sup 22}Ne(p,{gamma}){sup 23}Na and the neon-sodium cycle in a nova scenario have been studied by using the nuclear network code libnucnet at GSI in Darmstadt. A nova is an outburst of matter in a binary system consisting of a white dwarf and a red giant star. It is therefore a representative phenomenon for explosive hydrogen burning. For the calculation of the nucleosynthesis during the nova outburst, the code libnucnet requires the initial mass composition of the novae partners, the temperature and density profiles of the nova explosion and the thermonuclear reaction rates of the participating reactions. In the following, the code determined the flow and the final atomic abundance in the neon-sodium cycle during the entire nova process. Additionally, the influence of the temperature profile of the novae outburst as well as the thermonuclear reaction rate of the {sup 22}Ne(p,{gamma}){sup 23}Na reaction on the final atomic abundance in the outburst has been studied. A characteristic measure for the reactions in astrophysical environments is the thermonuclear reaction rate. The reaction rate of {sup 22}Ne(p,{gamma}){sup 23}Na has still strong uncertainties in the temperature range of T = 0.03 - 0.3 GK. These uncertainties are based on insufficient upper limits of the resonance strengths as well as the possible existence of tentative states that are populated in the energy range of E{sup lab}{sub p} = 30 - 300 keV. The research presented in this thesis is dedicated to the experimental study of the {sup 22}Ne(p,{gamma}){sup 23}Na reaction for an improved determination of the

  19. Sepsis does not alter red blood cell glucose metabolism or Na+ concentration: A 2H-, 23Na-NMR study

    Energy Technology Data Exchange (ETDEWEB)

    Hotchkiss, R.S.; Song, S.K.; Ling, C.S.; Ackerman, J.J.; Karl, I.E. (Washington Univ. School of Medicine, St. Louis (USA))

    1990-01-01

    The effects of sepsis on intracellular Na+ concentration ((Na+)i) and glucose metabolism were examined in rat red blood cells (RBCs) by using 23Na- and 2H-nuclear magnetic resonance (NMR) spectroscopy. Sepsis was induced in 15 halothane-anesthetized female Sprague-Dawley rats by using the cecal ligation and perforation technique; 14 control rats underwent cecal manipulation without ligation. The animals were fasted for 36 h, but allowed free access to water. At 36 h postsurgery, RBCs were examined by 23Na-NMR by using dysprosium tripolyphosphate as a chemical shift reagent. Human RBCs from 17 critically ill nonseptic patients and from 7 patients who were diagnosed as septic were also examined for (Na+)i. Five rat RBC specimens had (Na+)i determined by both 23Na-NMR and inductively coupled plasma-atomic emission spectroscopy (ICP-AES). For glucose metabolism studies, RBCs from septic and control rats were suspended in modified Krebs-Henseleit buffer containing (6,6-2H2)glucose and examined by 2H-NMR. No significant differences in (Na+)i or glucose utilization were found in RBCs from control or septic rats. There were no differences in (Na+)i in the two groups of patients. The (Na+)i determined by NMR spectroscopy agreed closely with measurements using ICP-AES and establish that 100% of the (Na+)i of the RBC is visible by NMR. Glucose measurements determined by 2H-NMR correlated closely (correlation coefficient = 0.93) with enzymatic analysis. These studies showed no evidence that sepsis disturbed RBC membrane function or metabolism.

  20. Sodium-23 magnetic resonance imaging during and after transient cerebral ischemia: multinuclear stroke protocols for double-tuned 23Na/1H resonator systems

    Science.gov (United States)

    Wetterling, Friedrich; Ansar, Saema; Handwerker, Eva

    2012-11-01

    A double-tuned 23Na/1H resonator system was developed to record multinuclear MR image data during and after transient cerebral ischemia. 1H-diffusion-, 1H perfusion, 1H T2-, 1H arterial blood flow- and 23Na spin density-weighted images were then acquired at three time points in a rodent stroke model: (I) during 90 min artery occlusion, (II) directly after arterial reperfusion and (III) one day after arterial reperfusion. Normal 23Na was detected in hypoperfused stroke tissue which exhibited a low 1H apparent diffusion coefficient (ADC) and no changes in 1H T2 relaxation time during transient ischemia, while 23Na increased and ADC values recovered to normal values directly after arterial reperfusion. For the first time, a similar imaging protocol was set-up on a clinical 3T MRI site in conjunction with a commercial double-tuned 1H/23Na birdcage resonator avoiding a time-consuming exchange of resonators or MRI systems. Multinuclear 23Na/1H MRI data sets were obtained from one stroke patient during both the acute and non-acute stroke phases with an aquisition time of 22 min. The lesion exhibiting low ADC was found to be larger compared to the lesion with high 23Na at 9 h after symptom onset. It is hoped that the presented pilot data demonstrate that fast multinuclear 23Na/1H MRI preclinical and clinical protocols can enable a better understanding of how temporal and regional MRI parameter changes link to pathophysiological variations in ischemic stroke tissue.

  1. Diagnostics of a charge breeder electron cyclotron resonance ion source helium plasma with the injection of ^{23}Na^{1+} ions

    Directory of Open Access Journals (Sweden)

    O. Tarvainen

    2016-05-01

    Full Text Available This work describes the utilization of an injected ^{23}Na^{1+} ion beam as a diagnostics of the helium plasma of a charge breeder electron cyclotron resonance ion source. The obtained data allows estimating the upper limit for the ion-ion collision mean-free path of the incident sodium ions, the lower limit of ion-ion collision frequencies for all charge states of the sodium ions and the lower limit of the helium plasma density. The ion-ion collision frequencies of high charge state ions are shown to be at least on the order of 1–10 MHz and the plasma density is estimated to be on the order of 10^{11}  cm^{-3} or higher. The experimental results are compared to simulations of the ^{23}Na^{1+} capture into the helium plasma. The results indicate that the lower breeding efficiency of light ions in comparison to heavier elements is probably due to different capture efficiencies in which the in-flight ionization of the incident 1+ ions plays a vital role.

  2. A 125Te and 23Na NMR investigation of the structure and crystallisation of sodium tellurite glasses.

    Science.gov (United States)

    Holland, D; Bailey, J; Ward, G; Turner, B; Tierney, P; Dupree, R

    2005-01-01

    125Te static nuclear magnetic resonance (NMR) and 23Na and 125Te magic angle spinning (MAS) NMR have been used, in conjunction with X-ray diffraction, to examine the structure and crystallisation behaviour of glasses of composition xNa2O.(1-x)TeO2 (0.075 x 0.4). The MAS NMR 23Na spectra from the glasses are broad and featureless but shift by approximately +5 ppm with increased x, i.e. as the system becomes more ionic. The static 125Te NMR spectra show an increase in axial symmetry with increasing x, indicating a shift from predominantly [TeO4] to [TeO3] structural units. The 23Na and 125Te spectra from the crystallised samples have been fitted to obtain information on the sites in the metastable crystal phases, which are the first to form on heating and which are therefore more closely related to the glass structure than thermodynamically stable crystal phases. New sodium tellurite phases are reported, including a sodium stabilised, face centred cubic phase related to delta-TeO2; a metastable form of Na2Te4O9 containing 3 sodium and 4 tellurium sites; and a metastable form of Na2Te2O5 containing 2 sodium sites. There is evidence of oxidation of TeIV to TeVI occurring in glasses with high values of x and, at x=0.40 and 0.50 (outside the glass forming range), some sodium metatellurate (Na2TeO4) is formed at the same time as sodium metatellurite (Na2TeO3). The 125Te shift is very sensitive to environment within the sodium tellurite system, covering more than 320 ppm, with anisotropies varying from 640 to 1540 ppm. The lack of features in the 125Te spectra of the glass phases, combined with the large shift range and high but variable anisotropy, means than it is not possible to obtain a unique fit to any presumed species present. Furthermore, the chemical shift anisotropy parameters for three of the four Te sites in the Na2Te4O9 phase are found to lie outside the range used for previous simulations of glass spectra.

  3. Determination of the (Na+) Sternheimer antishielding factor by 23Na NMR spectroscopy on sodium oxide chloride, Na3OCl.

    Science.gov (United States)

    Klösters, G; Jansen, M

    2000-07-01

    The (Na+) Sternheimer antishielding factor gammainifinity (Na+) was determined by 23Na NMR spectroscopy on sodium oxide-chloride, Na3OCl. The quadrupolar coupling constant of the sodium ion in Na3OCI was determined to QCC = 11.34 MHz, which presents the largest coupling constant of a sodium nucleus observed so far. Applying a simple point charge model, the largest principal value of the electric field gradient at the sodium site was calculated to V(zz) = -6.76762 x 10(20) V/m2. From these values we calculated the (Na+) Sternheimer antishielding factor to gammainifinity (Na+)= -5.36. In sodium oxide, Na2O, we observed an isotropic chemical shift of deltaCS = 55.1 ppm, referenced to 1 M aqueous NaCI (delta = 0 ppm).

  4. Design of a multimodal ({sup 1}H/{sup 23}Na MR/CT) anthropomorphic thorax phantom

    Energy Technology Data Exchange (ETDEWEB)

    Neumann, Wiebke; Lietzmann, Florian; Schad, Lothar R.; Zoellner, Frank G. [Heidelberg Univ., Mannheim (Germany). Computer Assisted Clinical Medicine

    2017-08-01

    This work proposes a modular, anthropomorphic MR and CT thorax phantom that enables the comparison of experimental studies for quantitative evaluation of deformable, multimodal image registration algorithms and realistic multi-nuclear MR imaging techniques. A human thorax phantom was developed with insertable modules representing lung, liver, ribs and additional tracking spheres. The quality of human tissue mimicking characteristics was evaluated for {sup 1}H and {sup 23}Na MR as well as CT imaging. The position of landmarks in the lung lobes was tracked during CT image acquisition at several positions during breathing cycles. {sup 1}H MR measurements of the liver were repeated after seven months to determine long term stability. The modules possess HU, T{sub 1} and T{sub 2} values comparable to human tissues (lung module: -756 ± 148 HU, artificial ribs: 218 ± 56 HU (low CaCO{sub 3} concentration) and 339 ± 121 (high CaCO{sub 3} concentration), liver module: T{sub 1} = 790 ± 28 ms, T{sub 2} = 65 ± 1 ms). Motion analysis showed that the landmarks in the lung lobes follow a 3D trajectory similar to human breathing motion. The tracking spheres are well detectable in both CT and MRI. The parameters of the tracking spheres can be adjusted in the following ranges to result in a distinct signal: HU values from 150 to 900 HU, T{sub 1} relaxation time from 550 ms to 2000 ms, T{sub 2} relaxation time from 40 ms to 200 ms. The presented anthropomorphic multimodal thorax phantom fulfills the demands of a simple, inexpensive system with interchangeable components. In future, the modular design allows for complementing the present set up with additional modules focusing on specific research targets such as perfusion studies, {sup 23}Na MR quantification experiments and an increasing level of complexity for motion studies.

  5. Periodic ab initio calculation of nuclear quadrupole parameters as an assignment tool in solid-state NMR spectroscopy: applications to 23Na NMR spectra of crystalline materials.

    Science.gov (United States)

    Johnson, Clive; Moore, Elaine A; Mortimer, Michael

    2005-05-01

    Periodic ab initio HF calculations using the CRYSTAL code have been used to calculate (23)Na NMR quadrupole parameters for a wide range of crystalline sodium compounds including Na(3)OCl. An approach is developed that can be used routinely as an alternative to point-charge modelling schemes for the assignment of distinct lines in (23)Na NMR spectra to specific crystallographic sodium sites. The calculations are based on standard 3-21 G and 6-21 G molecular basis sets and in each case the same modified basis set for sodium is used for all compounds. The general approach is extendable to other quadrupolar nuclei. For the 3-21 G calculations a 1:1 linear correlation between experimental and calculated values of C(Q)((23)Na) is obtained. The 6-21 G calculations, including the addition of d-polarisation functions, give better accuracy in the calculation of eta((23)Na). The sensitivity of eta((23)Na) to hydrogen atom location is shown to be useful in testing the reported hydrogen-bonded structure of Na(2)HPO(4).

  6. Prezentacja sprawozdań finansowychw formie elektronicznej przez największe jednostki gospodarcze w Polsce w kontekście oczekiwań interesariuszy

    Directory of Open Access Journals (Sweden)

    Jan Michalak

    2010-12-01

    oczekiwań interesariuszy dotyczących zawartości i formy sprawozdań finansowych w wersji elektronicz-nej. W części drugiej zostały przeanalizowane trendy w rozwoju elektronicznej komunikacji z interesariuszami. W części trzeciej zaprezentowano metodykę i wyniki badań empirycznych prowadzonych przez autora. Badania literaturowe i empiryczne autora wskazują na istnienie istotnej luki między oczekiwaniami interesariuszy a praktyką prezentacji sprawozdań finanso-wych w formie elektronicznej przez jednostki gospodarcze. Możliwości zwiększenia użyteczności sprawozdań finansowych w formie elektronicznej nie są wykorzystane ze względu na zachowawcze podejście jednostek sporządzających sprawozdania finansowe. Podejście to polega na prostym odwzorowaniu wersji papierowej w wersji elektronicznej sprawozdania.

  7. Study of the {sup 22}Ne(p,γ){sup 23}Na reaction at LUNA with a 4π BGO summing detector

    Energy Technology Data Exchange (ETDEWEB)

    Takacs, Marcell Peter; Bemmerer, Daniel; Szuecs, Tamas [Helmholtz-Zentrum Dresden-Rossendorf (HZDR), Dresden (Germany); Collaboration: LUNA-Collaboration

    2015-07-01

    The {sup 22}Ne(p,γ){sup 23}Na reaction takes part in the neon-sodium cycle of hydrogen burning. This cycle is active in asymptotic giant branch stars as well as in novae and contributes to the nucleosythesis of neon and sodium isotopes. In order to reduce the uncertainties in the predicted nucleosynthesis yields, new experimental efforts to measure the {sup 22}Ne(p,γ){sup 23}Na cross section directly at the astrophysically relevant energies are needed. In the first, recently completed phase of the LUNA {sup 22}Ne(p,γ){sup 23}Na experiment, selected low-energy resonances were studied with two high-purity germanium detectors. In the present talk, the preparations for the second experimental phase are reported. In this phase, a 4π bismuth germanate summing detector will be used to address the lowest-energy resonances as well as direct capture.

  8. Structural analysis of alkali cations in mixed alkali silicate glasses by 23Na and 133Cs MAS NMR

    Directory of Open Access Journals (Sweden)

    T. Minami

    2014-12-01

    Full Text Available We report the structural analysis of Na+ and Cs+ in sodium cesium silicate glasses by using 23Na and 133Cs magic-angle spinning nuclear magnetic resonance (MAS NMR spectroscopy. In the NMR spectra of cesium silicate crystals, the peak position shifted to higher magnetic field for structures with larger Cs+ coordination numbers and to lower magnetic field for smaller Cs+ coordination numbers. The MAS NMR spectra of xNa2O-yCs2O-2SiO2 (x = 0, 0.2, 0.33, 0.5, 0.66, 0.8, 1.0; x + y = 1 glass reveal that the average coordination number of both the alkali cations decreases with increasing Cs+/(Na+ + Cs+ ratio. In addition, the coordination number of Na+ in xNa2O-yCs2O-2SiO2 glass is smaller than that of Cs+. This difference between the average coordination numbers of the alkali cations is considered to be one structural reason of the mixed alkali effect.

  9. Characterization of Sodium Mobility and Binding by (23) Na NMR Spectroscopy in a Model Lipoproteic Emulsion Gel for Sodium Reduction.

    Science.gov (United States)

    Okada, Kyle S; Lee, Youngsoo

    2017-07-01

    The effects of formulation and processing parameters on sodium availability in a model lipid/protein-based emulsion gel were studied for purposes of sodium reduction. Heat-set model gels were prepared with varying levels of protein, lipid, and NaCl contents and high pressure homogenization treatments. Single quantum and double quantum-filtered (23) Na NMR spectroscopy experiments were used to characterize sodium mobility, structural order around "bound" (restricted mobility) sodium, and sodium binding, which have been correlated to saltiness perception in food systems previously. Total sodium mobility was lower in gels with higher protein or fat content, and was not affected by changes in homogenization pressure. The gels with increased protein, fat, or homogenization pressure had increased structure surrounding "bound" sodium and more relative "bound" sodium due to increased interfacial protein interactions. The data obtained in this study provide information on factors affecting sodium availability, which can be applied towards sodium reduction in lipid/protein-based foods. © 2017 Institute of Food Technologists®.

  10. 地衣芽孢杆菌基因文库的构建及分析%Construction and Analysis of Genomic Library of Bacillus licheni formis

    Institute of Scientific and Technical Information of China (English)

    熊裕焱; 彭雅娟; 卢瑞; 于怡; 王娜; 李清彪; 何宁

    2011-01-01

    作为一种高效无毒、无二次污染以及能够生物降解的水处理剂,生物絮凝剂受到越来越多的关注.以一株具有强絮凝活性地衣芽孢杆菌(Bacillus licheni formis)为实验菌,通过构建基因组文库,尝试筛选絮凝基因阳性克隆子.结果表明,该菌株基因文库构建成功,共得到2.1×103克隆子.随机挑取17个阳性克隆子进行DNA测序分析,发现一些相对保守蛋白及2个不具有明确功能的基因.该结果为进一步研究地衣芽孢杆菌全基因组结构功能及细菌絮凝基因奠定了基础.%As an efficient,innoxious, and biodegradable wastewater treatment agent with no secondary pollution, bioflocculant is receiving more and more concerns nowadays. In this paper,Bacillus licheniformis with excellent flocculating activity was used to construct the genomic library and tried to screen out the positive clones with flocculation gene. The results showcd that the genomic library was successfully consrructed,2. 1× 103 clones were screened out. 17 clones were randomly selected for DNA sequencing and analysis. Some relative conserved proteins and 2 novel genes with unknown functions were found. The results lay a foundation for the further study of gene encoding bacteria flocculant and the whole genomic structure and function of Bacillus licheniformis.

  11. The 12C(12C,α)20Ne and 12C(12C,p)23Na reactions at the Gamow peak via the Trojan Horse Method

    Science.gov (United States)

    Tumino, A.; Spitaleri, C.; Cherubini, S.; Guardo, L.; Gulino, M.; Indelicato, I.; La Cognata, M.; Lamia, L.; Pizzone, R. G.; Puglia, S. M. R.; Rapisarda, G. G.; Romano, S.; Sergi, M. L.; Spartá, R.

    2016-05-01

    A measurement of the 12C(14N,α20Ne)2H and 12C(14N,p23Na)2Hreactions has been performed at a 14N beam energy of 30.0 MeV. The experiment aims to explore the extent to which contributing 24Mg excited states can be populated in the quasi-free reaction off the deuteron in 14N. In particular, the 24Mg excitation region explored in the measurement plays a key role in stellar carbon burning whose cross section is commonly determined by extrapolating high-energy fusion data. From preliminary results, α and proton channels are clearly identified. In particular, ground and first excited states of 20Ne and 23Na play a major role.

  12. The Na+ transport in gram-positive bacteria defect in the Mrp antiporter complex measured with 23Na nuclear magnetic resonance.

    Science.gov (United States)

    Górecki, Kamil; Hägerhäll, Cecilia; Drakenberg, Torbjörn

    2014-01-15

    (23)Na nuclear magnetic resonance (NMR) has previously been used to monitor Na(+) translocation across membranes in gram-negative bacteria and in various other organelles and liposomes using a membrane-impermeable shift reagent to resolve the signals resulting from internal and external Na(+). In this work, the (23)Na NMR method was adapted for measurements of internal Na(+) concentration in the gram-positive bacterium Bacillus subtilis, with the aim of assessing the Na(+) translocation activity of the Mrp (multiple resistance and pH) antiporter complex, a member of the cation proton antiporter-3 (CPA-3) family. The sodium-sensitive growth phenotype observed in a B. subtilis strain with the gene encoding MrpA deleted could indeed be correlated to the inability of this strain to maintain a lower internal Na(+) concentration than an external one.

  13. Scan time reduction in {sup 23}Na-Magnetic Resonance Imaging using the chemical shift imaging sequence. Evaluation of an iterative reconstruction method

    Energy Technology Data Exchange (ETDEWEB)

    Weingaertner, Sebastian; Konstandin, Simon; Schad, Lothar R. [Heidelberg Univ., Mannheim (Germany). Computer Assisted Clinical Medicine; Wetterling, Friedrich [Heidelberg Univ., Mannheim (Germany). Computer Assisted Clinical Medicine; Dublin Univ. (Ireland) Trinity Inst. of Neuroscience; Fatar, Marc [Heidelberg Univ., Mannheim (Germany). Dept. of Neurology; Neumaier-Probst, Eva [Heidelberg Univ., Mannheim (Germany). Dept. of Neuroradiology

    2015-07-01

    To evaluate potential scan time reduction in {sup 23}Na-Magnetic Resonance Imaging with the chemical shift imaging sequence (CSI) using undersampled data of high-quality datasets, reconstructed with an iterative constrained reconstruction, compared to reduced resolution or reduced signal-to-noise ratio. CSI {sup 23}Na-images were retrospectively undersampled and reconstructed with a constrained reconstruction scheme. The results were compared to conventional methods of scan time reduction. The constrained reconstruction scheme used a phase constraint and a finite object support, which was extracted from a spatially registered {sup 1}H-image acquired with a double-tuned coil. The methods were evaluated using numerical simulations, phantom images and in-vivo images of a healthy volunteer and a patient who suffered from cerebral ischemic stroke. The constrained reconstruction scheme showed improved image quality compared to a decreased number of averages, images with decreased resolution or circular undersampling with weighted averaging for any undersampling factor. Brain images of a stroke patient, which were reconstructed from three-fold undersampled k-space data, resulted in only minor differences from the original image (normalized root means square error < 12%) and an almost identical delineation of the stroke region (mismatch < 6%). The acquisition of undersampled {sup 23}Na-CSI images enables up to three-fold scan time reduction with improved image quality compared to conventional methods of scan time saving.

  14. Distribution and mobility of phosphates and sodium ions in cheese by solid-state 31P and double-quantum filtered 23Na NMR spectroscopy.

    Science.gov (United States)

    Gobet, Mallory; Rondeau-Mouro, Corinne; Buchin, Solange; Le Quéré, Jean-Luc; Guichard, Elisabeth; Foucat, Loïc; Moreau, Céline

    2010-04-01

    The feasibility of solid-state magic angle spinning (MAS) (31)P nuclear magnetic resonance (NMR) spectroscopy and (23)Na NMR spectroscopy to investigate both phosphates and Na(+) ions distribution in semi-hard cheeses in a non-destructive way was studied. Two semi-hard cheeses of known composition were made with two different salt contents. (31)P Single-pulse excitation and cross-polarization MAS experiments allowed, for the first time, the identification and quantification of soluble and insoluble phosphates in the cheeses. The presence of a relatively 'mobile' fraction of colloidal phosphates was evidenced. The detection by (23)Na single-quantum NMR experiments of all the sodium ions in the cheeses was validated. The presence of a fraction of 'bound' sodium ions was evidenced by (23)Na double-quantum filtered NMR experiments. We demonstrated that NMR is a suitable tool to investigate both phosphates and Na(+) ions distributions in cheeses. The impact of the sodium content on the various phosphorus forms distribution was discussed and results demonstrated that NMR would be an important tool for the cheese industry for the processes controls.

  15. A new study of the $^{22}$Ne(p,$\\gamma$)$^{23}$Na reaction deep underground: Feasibility, setup, and first observation of the 186 keV resonance

    CERN Document Server

    Cavanna, F; Menzel, M -L; Aliotta, M; Anders, M; Bemmerer, D; Broggini, C; Bruno, C G; Caciolli, A; Corvisiero, P; Davinson, T; di Leva, A; Elekes, Z; Ferraro, F; Formicola, A; Fülöp, Zs; Gervino, G; Guglielmetti, A; Gustavino, C; Gyürky, Gy; Imbriani, G; Junker, M; Menegazzo, R; Prati, P; Alvarez, C Rossi; Scott, D A; Somorjai, E; Straniero, O; Strieder, F; Szücs, T; Trezzi, D

    2014-01-01

    The $^{22}$Ne(p,$\\gamma$)$^{23}$Na reaction takes part in the neon-sodium cycle of hydrogen burning. This cycle is active in asymptotic giant branch stars as well as in novae and contributes to the nucleosythesis of neon and sodium isotopes. In order to reduce the uncertainties in the predicted nucleosynthesis yields, new experimental efforts to measure the $^{22}$Ne(p,$\\gamma$)$^{23}$Na cross section directly at the astrophysically relevant energies are needed. In the present work, a feasibility study for a $^{22}$Ne(p,$\\gamma$)$^{23}$Na experiment at the Laboratory for Underground Nuclear Astrophysics (LUNA) 400\\,kV accelerator deep underground in the Gran Sasso laboratory, Italy, is reported. The ion beam induced $\\gamma$-ray background has been studied. The feasibility study led to the first observation of the $E_{\\rm p}$ = 186\\,keV resonance in a direct experiment. An experimental lower limit of 0.12\\,$\\times$\\,10$^{-6}$\\,eV has been obtained for the resonance strength. Informed by the feasibility study,...

  16. [Application of near infrared spectroscopy to qualitative identification and quantitative determination of Puccinia strii formis f. sp. tritici and P. recondita f. sp. tritici].

    Science.gov (United States)

    Li, Xiao-Long; Ma, Zhan-Hong; Zhao, Long-Lian; Li, Jun-Hui; Wang, Hai-Guang

    2014-03-01

    To realize qualitative identification and quantitative determination of Puccinia strii formis f. sp. tritici (Pst) and P. recondita f. sp. tritici (Prt), a qualitative identification model was built using near infrared reflectance spectroscopy (NIRS) combined with distinguished partial least squares (DPLS), and a quantitative determination model was built using NIRS combined with quantitative partial least squares (QPLS). In this study, 100 pure samples including 50 samples of Pst and 50 samples of Prt were obtained, and 120 mixed samples including three replicates of mixed urediospores of the two kinds of pathogen in different proportions (the content of Pst was within the range of 2. 5% 100% with 2. 5% as the gradient) were obtained. Then the spectra of the samples were collected using MPA spectrometer, respectively. Both pure samples and mixed samples were divided into training set and testing set with the ratio equal to 2:1. Qualitative identification model and quantitative determination model were built using internal cross-validation method in the spectral region 4,000--10,000 cm(-1) based on the training sets from pure samples and mixed samples, respectively. The results showed that the identification rates of the Pst-Prt qualitative identification model for training set and testing set were both up to 100. 00% when scatter correction was used as the preprocessing method of the spectra and the number of principal components was 3. When 'range normalization + scatter correction' was used as the preprocessing method of the spectra and the number of principal components was 6, determination coefficient (RZ), standard error of calibration (SEC) and average absolute relative deviation(AARD) of the Pst-Prt quantitative determination model for training set were 99.36%, 2.31% and 8.94%, respectively, and R2, standard error of prediction (SEP) and AARD for testing set were 99.37%, 2.29% and 5. 0%, respectively. The results indicated that qualitative identification

  17. In Situ 13C and 23Na Magic Angle Spinning NMR Investigation of Supercritical CO2 Incorporation in Smectite-Natural Organic Matter Composites

    Energy Technology Data Exchange (ETDEWEB)

    Bowers, Geoffrey M.; Hoyt, David W.; Burton, Sarah D.; Ferguson, Brennan O.; Varga, Tamas; Kirkpatrick, Robert J.

    2014-01-29

    This paper presents an in situ NMR study of clay-natural organic polymer systems (a hectoritehumic acid [HA] composite) under CO2 storage reservoir conditions (90 bars CO2 pressure, 50°C). The 13C and 23Na NMR data show that supercritical CO2 interacts more strongly with the composite than with the base clay and does not react to form other C-containing species over several days at elevated CO2. With and without organic matter, the data suggest that CO2 enters the interlayer space of Na-hectorite equilibrated at 43% relative humidity. The presence of supercritical CO2 also leads to increased 23Na signal intensity, reduced line width at half height, increased basal width, more rapid 23Na T1 relaxation rates, and a shift to more positive resonance frequencies. Larger changes are observed for the hectorite-HA composite than for the base clay. In light of recently reported MD simulations of other polymer-Na-smectite composites, we interpret the observed changes as an increase in the rate of Na+ site hopping in the presence of supercritical CO2, the presence of potential new Na+ sorption sites when the humic acid is present, and perhaps an accompanying increase in the number of Na+ ions actively involved in site hopping. The results suggest that the presence of organic material either in clay interlayers or on external particle surfaces can significantly affect the behavior of supercritical CO2 and the mobility of metal ions in reservoir rocks.

  18. Observables in muon capture on {sup 23}Na and the effective weak couplings {ital {tilde g}}{sub {ital a}} and {ital {tilde g}}{sub {ital p}}

    Energy Technology Data Exchange (ETDEWEB)

    Johnson, B.L.; Gorringe, T.P.; Armstrong, D.S.; Bauer, J.; Hasinoff, M.D.; Kovash, M.A.; Measday, D.F.; Moftah, B.A.; Porter, R.; Wright, D.H. [Department of Physics and Astronomy, University of Kentucky, Lexington, Kentucky 40506 (United States)]|[Department of Physics, College of William and Mary, Williamsburg, Virginia 23187 (United States)]|[Department of Physics and Astronomy, University of British Columbia, Vancouver, British Columbia, V6T 1Z1 (CANADA)]|[TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia, V6T 2A3 (CANADA)

    1996-11-01

    We report measurements of capture rates and hyperfine dependences in muon capture on {sup 23}Na to various states in Ne and F isotopes. We also report comparisons of the capture rates and hyperfine dependences for six {sup 23}Na {r_arrow} {sup 23}Ne transitions with the 1{ital s}-0{ital d} shell model with the empirical effective interaction of Brown and Wildenthal and the realistic effective interaction of Kuo and Brown. Fits to the data with the Brown and Wildenthal interaction yield an effective coupling {ital {tilde g}}{sub {ital a}} = {minus}1.01 {plus_minus} 0.07 and an effective coupling ratio {ital {tilde g}}{sub {ital p}}/{ital {tilde g}}{sub {ital a}} = 6.5 {plus_minus} 2.4. The value of {ital {tilde g}}{sub {ital a}} is consistent with values of {ital {tilde g}}{sub {ital a}} extracted from {beta}{sup +}/{beta}{sup {minus}} decay and ({ital p},{ital n})/({ital n},{ital p}) charge exchange data, and the value of {ital {tilde g}}{sub {ital p}}/{ital {tilde g}}{sub {ital a}} is consistent with the predictions of PCAC and pion-pole dominance. We evaluate the nuclear model dependence of these values of {ital {tilde g}}{sub {ital a}} and {ital {tilde g}}{sub {ital p}}/{ital {tilde g}}{sub {ital a}} and examine the role of the Gamow-Teller and other matrix elements in the {sup 23}Na {r_arrow} {sup 23}Ne transitions. {copyright} {ital 1996 The American Physical Society.}

  19. Atrophy of calf muscles by unloading results in an increase of tissue sodium concentration and fat fraction decrease: a (23)Na MRI physiology study.

    Science.gov (United States)

    Gerlach, D A; Schopen, K; Linz, P; Johannes, B; Titze, J; Zange, J; Rittweger, J

    2017-08-01

    (23)Na MRI demonstrated increased tissue sodium concentrations in a number of pathologies. Acute atrophy results in muscle fibre volume shrinking that may result in a relative increase of extracellular volume and might affect sodium concentration. Thus, we hypothesized that local unloading of the calf muscles would lead to a decrease in muscle volume and an increase in muscle tissue sodium concentration. One lower leg of 12 healthy male subjects was submitted to a 60 day long period of unloading using the Hephaistos orthosis, while the other leg served as control. (23)Na MRI and 2D PD-weighted Dixon turbo spin echo were obtained from the control and orthosis leg using a 3T scanner. For quantification, a sodium reference phantom was used with 10, 20, 30, and 40 mmol/L NaCl solution. Tissue sodium concentration (TSC) increased as an effect of unloading in the orthosis leg. Relative increases were 17.4 ± 16.8% (P = 0.005) in gastrocnemius medialis muscle, 11.1 ± 12.5 (P = 0.037) in gastrocnemius lateralis muscle, 16.2 ± 4.7% (P muscle, 10.0 ± 10.5% (P = 0.009) in the ventral muscle group, and 10.7 ± 10.0% (P = 0.003) in the central muscle group, respectively. TSC in the control leg did not significantly change. In the orthosis leg, muscle volume decreased as follows: medial gastrocnemius muscle: -5.4 ± 8.3% (P = 0.043) and soleus muscle: -7.8 ± 15.0% (P = 0.043). Unloading atrophy is associated with an increase in muscle sodium concentration. (23)Na MRI is capable of detecting these rather small changes.

  20. Nové formy marketingu

    OpenAIRE

    Khalilova, Nazila

    2008-01-01

    The bachelor thesis "New trends in marketing communication" focuses on the new methods in a communication mix, such as guerilla, buzz, mobile, direct and event marketing, and product placement. The primary goal of the thesis is to define these tools and show the importance of implementing these methods in a globalised world. Samples of implementations of these new tools are shown on both, the Azerbaijanian and world market, in the practical part of the thesis. Also, Azerbaijanian market is sh...

  1. Strengths of the resonances at 436, 479, 639, 661, and 1279 keV in the $^{22}$Ne(p,$\\gamma$)$^{23}$Na reaction

    CERN Document Server

    Depalo, Rosanna; Ferraro, Federico; Slemer, Alessandra; Al-Abdullah, Tariq; Akhmadaliev, Shavkat; Anders, Michael; Bemmerer, Daniel; Elekes, Zoltán; Mattei, Giovanni; Reinicke, Stefan; Schmidt, Konrad; Scian, Carlo; Wagner, Louis

    2015-01-01

    The $^{22}$Ne(p,$\\gamma$)$^{23}$Na reaction is included in the neon-sodium cycle of hydrogen burning. A number of narrow resonances in the Gamow window dominates the thermonuclear reaction rate. Several resonance strengths are only poorly known. As a result, the $^{22}$Ne(p,$\\gamma$)$^{23}$Na thermonuclear reaction rate is the most uncertain rate of the cycle. Here, a new experimental study of the strengths of the resonances at 436, 479, 639, 661, and 1279 keV proton beam energy is reported. The data have been obtained using a tantalum target implanted with $^{22}$Ne. The strengths $\\omega\\gamma$ of the resonances at 436, 639, and 661 keV have been determined with a relative approach, using the 479 and 1279 keV resonances for normalization. Subsequently, the ratio of resonance strengths of the 479 and 1279 keV resonances was determined, improving the precision of these two standards. The new data are consistent with, but more precise than, the literature with the exception of the resonance at 661 keV, which i...

  2. 1H and 23Na MAS NMR spectroscopy of cationic species in CO2 selective alkaline earth metal porous silicoaluminophosphates prepared via liquid and solid state ion exchange

    Science.gov (United States)

    Arévalo-Hidalgo, Ana G.; Dugar, Sneha; Fu, Riqiang; Hernández-Maldonado, Arturo J.

    2012-07-01

    The location of extraframework cations in Sr2+ and Ba2+ ion-exchanged SAPO-34 was estimated by means of 1H and 23Na MAS NMR spectroscopy and spectral deconvolution. Incorporation of the alkaline earth metal cations onto the SAPO framework was achieved via liquid state ion exchange, coupled partial detemplation/solid-state ion exchange, and combination of both techniques. MAS NMR revealed that the level of ion exchange was limited by the presence of protons and sodium cations near hexagonal prisms (site SI), which are relatively difficult to exchange with the alkaline earth metal due to steric and charge repulsion criteria. In addition, the presence of ammonium cations in the supercages facilitated the exchange of otherwise tenacious hydrogen as corroborated by unit cell compositional data as well as enhanced CO2 adsorption at low partial pressures. The extraframework ammonium species were produced from partial detemplation of the structure-directing agent employed for the SAPO-34 synthesis, tetraethylammonium.

  3. 20 Ne(p, γ)22Na and 22Ne(p, γ)23Na Reaction Study with 5U-4 St. Ana Accelerator

    Science.gov (United States)

    Lyons, Stephanie; Goerres, Joachim; Jung, Hyo Soon; Robertson, Dan; Setoodehnia, Kiana; Stech, Ed; Wiescher, Michael; Kontos, Antonios

    2014-09-01

    Hydrogen burning can proceed via the NeNa cycle in stars whose stellar temperature is greater than 0.05GK. The NeNa cycle is important for the nucleosynthesis of Ne, Na, and Mg isotopes. Direct capture and the high energy tail of a subthreshold resonance dominate the stellar reaction rate for 20Ne(p, γ)21Na. The strength of the non-resonant contributions were measured relative to the resonance at 1.17 MeV. Due to conflicting results, we have remeasured the strength of this resonance relative to the 1.28 MeV resonance in 22Ne(p, γ)23Na using implanted neon targets. Study of this reaction has continued using the newly commissioned 5U-4 St. Ana Accelerator and re-furbished Rhinoceros Gas Target.

  4. High-resolution laser spectroscopy of the X1Sigma + and (1)3Sigma + states of 23Na85Rb molecule

    Science.gov (United States)

    Kasahara, Shunji; Ebi, Tsuyoshi; Tanimura, Mari; Ikoma, Heiji; Matsubara, Kensuke; Baba, Masaaki; Katô, Hajime

    1996-07-01

    High-resolution spectra of the B1Π→X1Σ+ transition of 23Na85Rb molecule are measured by the technique of the Doppler-free optical-optical double resonance polarization spectroscopy (OODRPS). The molecular constants of the X1Σ+(v″=5-30) levels are determined, and the potential energy curve is constructed up to v″=30 by the RKR method. The time-resolved fluorescence intensity following the excitation to the B1Π(v'=5,J'= around 20) level is measured, and the lifetime of the B1Π(v'=5) level in collisionless limit is determined to be 17.8 ns. The absolute value of the electric dipole moment of the B1Π-X1Σ+ transition is determined to be 7.0 D in the region of 3.73 Ålines to the (1)3Σ+ state from the B1Π(v'=8,J'=15) level, which is perturbed by the (1)3Π1(v0,N=J=15) level, are measured by the Doppler-free OODRPS. The energy spacing between the F1 and F3 components of the (1)3Σ+(v=4,N=15) level is observed to be smaller than 0.001 cm-1. The hyperfine splittings, which are described by Hund's case (bβS), are observed, and the hyperfine constants ANa and ARb of the (1)3Σ+(v=4) level are determined to be 0.0293 and 0.0336 cm-1, respectively. The hyperfine splittings are identified as originating from the Fermi contact interaction. From the analysis, it is concluded that the electron spins in the (1)3Σ+ state are almost equally populated to the 5sRb and 3sNa orbitals.

  5. A 23Na Multiple-Quantum-Filtered NMR Study of the Effect of the Cytoskeleton Conformation on the Anisotropic Motion of Sodium Ions in Red Blood Cells

    Science.gov (United States)

    Knubovets, Tatyana; Shinar, Hadassah; Eliav, Uzi; Navon, Gil

    1996-01-01

    Recently, it has been shown that23Na double-quantum-filtered NMR spectroscopy can be used to detect anisotropic motion of bound sodium ions in biological systems. The technique is based on the formation of the second-rank tensor when the quadrupolar interaction is not averaged to zero. Using this method, anisotropic motion of bound sodium in human and dog red blood cells was detected, and the effect was shown to depend on the integrity of the membrane cytoskeleton. In the present study, multiple-quantum-filtered techniques were applied in combination with a quadrupolar echo to measure the transverse-relaxation times,T2fandT2s. Line fitting was performed to obtain the values of the residual quadrupolar interaction, which was measured for sodium in a variety of mammalian erythrocytes of different size, shape, rheological properties, and sodium concentrations. Human unsealed white ghosts were used to study sodium bound at the anisotropic sites on the inner side of the RBC membrane. Modulations of the conformation of the cytoskeleton by the variation of either the ionic strength or pH of the suspending medium caused drastic changes in both the residual quadrupolar interaction andT2fdue to changes in the fraction of bound sodium ions as well as changes in the structure of the binding sites. By combining the two spectroscopic parameters, structural change can be followed. The changes in the structure of the sodium anisotropic binding sites deduced by this method were found to correlate with known conformational changes of the membrane cytoskeleton. Variations of the medium pH affected both the fraction of bound sodium ions and the structure of the anisotropic binding sites. Sodium and potassium were shown to bind to the anisotropic binding sites with the same affinity.

  6. Temperature calibration for high-temperature MAS NMR to 913 K: 63Cu MAS NMR of CuBr and CuI, and 23Na MAS NMR of NaNbO3.

    Science.gov (United States)

    Wu, Jingshi; Kim, Namjun; Stebbins, Jonathan F

    2011-09-01

    The solid-state phase transitions of CuBr, CuI and NaNbO(3) can be readily observed using (63)Cu and (23)Na high-temperature magic-angle spinning nuclear magnetic resonance spectroscopy. Temperature has large, linear effects on the peak maximum of (63)Cu in each solid phase of CuBr and CuI, and there is large jump in shift across each phase transition. The (23)Na MAS NMR peak intensities and the line widths in NaNbO(3) also clearly show its high-temperature transition to the cubic phase. These data can be used to calibrate high-temperature MAS NMR probes up to 913 K, which is two hundred degrees higher than the commonly-used temperature calibration based on the chemical shift of (207)Pb in Pb(NO(3))(2). Copyright © 2011 Elsevier Inc. All rights reserved.

  7. FORMY DYSKRYMINACJI KOBIET NA POLSKIM RYNKU PRACY

    OpenAIRE

    Kalinowska-Nawrotek, Barbara

    2004-01-01

    The subject of this paper is the analysis of gender inequalities in the professional sphere on the Polish labour markets from 1992 till 2003. In the beginning the definition and the forms of discrimination against women on the labour market were presented. Next the trial of the identification and the materialization of discrimination of women on the Polish labour market was raised on the basis of statistical data (GUS, Eurostat) and the results of public survey (bulletins of CB...

  8. Competitive binding exchange between alkali metal ions (K+, Rb+, and Cs+) and Na+ ions bound to the dimeric quadruplex [d(G4T4G4)]2: a 23Na and 1H NMR study.

    Science.gov (United States)

    Cesare Marincola, Flaminia; Virno, Ada; Randazzo, Antonio; Mocci, Francesca; Saba, Giuseppe; Lai, Adolfo

    2009-12-01

    A comparative study of the competitive cation exchange between the alkali metal ions K+, Rb+, and Cs+ and the Na+ ions bound to the dimeric quadruplex [d(G4T4G4)]2 was performed in aqueous solution by a combined use of the 23Na and 1H NMR spectroscopy. The titration data confirm the different binding affinities of these ions for the G-quadruplex and, in particular, major differences in the behavior of Cs+ as compared to the other ions were found. Accordingly, Cs+ competes with Na+ only for the binding sites at the quadruplex surface (primarily phosphate groups), while K+ and Rb+ are also able to replace sodium ions located inside the quadruplex. Furthermore, the 1H NMR results relative to the CsCl titration evidence a close approach of Cs+ ions to the phosphate groups in the narrow groove of [d(G4T4G4)]2. Based on a three-site exchange model, the 23Na NMR relaxation data lead to an estimate of the relative binding affinity of Cs+ versus Na+ for the quadruplex surface of 0.5 at 298 K. Comparing this value to those reported in the literature for the surface of the G-quadruplex formed by 5'-guanosinemonophosphate and for the surface of double-helical DNA suggests that topology factors may have an important influence on the cation affinity for the phosphate groups on DNA.

  9. Surface characteristics of the iron-oxyhydroxide layer formed during brick coatings by ESEM/EDS, {sup 23}Na and {sup 1}H MAS NMR, and ToF-SIMS

    Energy Technology Data Exchange (ETDEWEB)

    Allahdin, O. [Chaire Unesco « Sur la gestion de l' eau », Laboratoire Hydrosciences Lavoisier, Université de Bangui, Faculté des Sciences, B.P. 908 (Central African Republic); Wartel, M. [Université Lille1, Laboratoire LASIR (UMR CNRS 8516), Equipe Physico-chimie de l' Environnement, Bât. C8, 2" è" m" e étage, 59655 Villeneuve d' Ascq cedex (France); Mabingui, J. [Chaire Unesco « Sur la gestion de l' eau », Laboratoire Hydrosciences Lavoisier, Université de Bangui, Faculté des Sciences, B.P. 908 (Central African Republic); Revel, B. [Université Lille1, Service RMN, Bât. C4, 59655 Villeneuve d' Ascq cedex (France); Nuns, N. [Université Lille1, Institut Chevreul, 59655 Villeneuve d' Ascq cedex (France); Boughriet, A., E-mail: abdel.boughriet@univ-lille1.fr [Université Lille1, Laboratoire LASIR (UMR CNRS 8516), Equipe Physico-chimie de l' Environnement, Bât. C8, 2" è" m" e étage, 59655 Villeneuve d' Ascq cedex (France)

    2015-09-01

    Brick made locally by craftsmen in Bangui (Central African Republic) was modified first by HCl activation and second by iron-oxyhydroxide impregnation through the precipitation of ferric ions by NaOH at various fixed pH values (ranging from 3 to 13). The elemental analyses of synthesized compounds were performed using ICP-AES, and their surface chemistry/properties were investigated by environmental scanning electron microscopy (ESEM/EDS), {sup 1}H and {sup 23}Na MAS NMR spectroscopy, and time-of-flight secondary ion mass spectrometry (ToF-SIMS). The evidence of different {sup 23}Na chemical environments and the coexistence of Si and Al bound to ferrihydrite were made. The surface properties of this material which was found to be dependent upon synthesis pH, contributed to enhance metal uptake from water. - Highlights: • HCl-activated brick was coated at different Fe(III)-precipitation pH. • Surface properties were determined by ESEM, NMR and ToF-SIMS. • Al- and Si-bearing ferrihydrite and different Na environments were detected. • The pH used for modified-brick synthesis influenced metal uptake from water.

  10. 毛乌素沙地樟子松和油松人工林光合生理特性%The Photosynthetic Characteristics of Pinus Sylvestris var, Mongolica and Pinus Tabulae formis in Mu Us Sandland

    Institute of Scientific and Technical Information of China (English)

    丁晓纲; 何茜; 李吉跃; 张方秋; 刘育贤

    2011-01-01

    In the growing season, the daily gas exchange, water use efficiency of Pinus sylvestris var. mongolica and Pinus tabulae formis in Mu Us sandland were measured with a portable Li-6400 gas analysis system under natural conditions. The results showed that the diurnal courses of net photosynthetic rate and transpiration rate display a singal-peak pattern. Water use efficiency culminates in the early morning. The maximum and the average value of the net photosynthesis of the Pinus sylvestris var. mongolica is larger than that of the Pinus tabulaeformis. The average value of the water use efficiency of Pinus sylvestris var.mongolica is 3. 63 tμmolCO2/mmolH2O, which was higher than that of Pinus tabulaeformis (3. 22 μmol CO2/mmolH2O). Regression analysis showed that the net photosynthetic rate of Pinus sylvestris var. mongolica was controlled by PAR, Gs and Ci, while for Pinus tabulaeformis was PAR and Gs.%利用Li-6400便携式气体分析系统,在自然条件下对毛乌素沙地腹地樟子松和油松人工林生长季叶片气体交换、水分利用效率及相关环境因子进行测定,同时探讨了影响樟子松、油松光合速率的内外因素.结果表明:生长季内毛乌素地区油松和樟子松的光合速率、蒸腾速率都表现出一定的日变化规律,都呈单峰型变化曲线;6月、7月、8月针叶树水分利用效率曲线呈下降趋势,上午时段的水分利用效率明显高于下午时段的水分利用效率.5月和9月针叶树水分利用效率日变化呈"W"型曲线,樟子松水分利用效率生长季均值为3.6μcmo1O0 /mmo1HO0,油松水分利用效率生长季均值为3.22μmmolCO2/mmolH2O,樟子松的水分利用效率始终高于油松.樟子松的净光合速率主要受光合有效辐射、气孔导度和胞间CO2浓度的影响,限制油松净光合速率的主要因子是光合有效辐射PAR和气孔导度.

  11. {sup 1}H and {sup 23}Na MAS NMR spectroscopy of cationic species in CO{sub 2} selective alkaline earth metal porous silicoaluminophosphates prepared via liquid and solid state ion exchange

    Energy Technology Data Exchange (ETDEWEB)

    Arevalo-Hidalgo, Ana G. [Department of Chemical Engineering, University of Puerto Rico-Mayagueez Campus, Mayagueez, PR 00681-9000 (Puerto Rico); Dugar, Sneha; Fu, Riqiang [National High Magnetic Field Laboratory, Florida State University, Tallahassee, FL 32310 (United States); Hernandez-Maldonado, Arturo J., E-mail: arturoj.hernandez@upr.edu [Department of Chemical Engineering, University of Puerto Rico-Mayagueez Campus, Mayagueez, PR 00681-9000 (Puerto Rico)

    2012-07-15

    The location of extraframework cations in Sr{sup 2+} and Ba{sup 2+} ion-exchanged SAPO-34 was estimated by means of {sup 1}H and {sup 23}Na MAS NMR spectroscopy and spectral deconvolution. Incorporation of the alkaline earth metal cations onto the SAPO framework was achieved via liquid state ion exchange, coupled partial detemplation/solid-state ion exchange, and combination of both techniques. MAS NMR revealed that the level of ion exchange was limited by the presence of protons and sodium cations near hexagonal prisms (site SI), which are relatively difficult to exchange with the alkaline earth metal due to steric and charge repulsion criteria. In addition, the presence of ammonium cations in the supercages facilitated the exchange of otherwise tenacious hydrogen as corroborated by unit cell compositional data as well as enhanced CO{sub 2} adsorption at low partial pressures. The extraframework ammonium species were produced from partial detemplation of the structure-directing agent employed for the SAPO-34 synthesis, tetraethylammonium. - Graphical abstract: MAS NMR was used to elucidate the position the cationic species in alkaline earth metal exchanged silicoaluminophosphates. These species played a significant role during the ion exchange process and, therefore, the materials ultimate CO{sub 2} adsorption performance. Highlights: Black-Right-Pointing-Pointer Location of extraframework Sr{sup 2+} or Ba{sup 2+} cations was estimated by means of {sup 1}H and {sup 23}Na MAS NMR. Black-Right-Pointing-Pointer Level of Sr{sup 2+} or Ba{sup 2+} ion exchange was limited by the presence of protons and sodium cations. Black-Right-Pointing-Pointer Presence of ammonium cations in the supercages facilitated the exchange. Black-Right-Pointing-Pointer Sr{sup 2+} and Ba{sup 2+} ion exchanged SAPOs are outstanding CO{sub 2} adsorbents.

  12. Estimation of covariances of {sup 16}O, {sup 23}Na, Fe, {sup 235}U, {sup 238}U and {sup 239}Pu neutron nuclear data in JENDL-3.2

    Energy Technology Data Exchange (ETDEWEB)

    Shibata, Keiichi [Japan Atomic Energy Research Inst., Tokai, Ibaraki (Japan). Tokai Research Establishment; Nakajima, Yutaka; Kawano, Toshihiko; Oh, Soo-Youl; Matsunobu, Hiroyuki; Murata, Toru

    1997-10-01

    Covariances of nuclear data have been estimated for 6 nuclides contained in JENDL-3.2. The nuclides considered are {sup 16}O, {sup 23}Na, Fe, {sup 235}U, {sup 238}U, and {sup 239}Pu, which are regarded as important for the nuclear design study of fast reactors. The physical quantities for which covariances are deduced are cross sections, resolved and unresolved resonance parameters, and the first order Legendre-polynomial coefficient for the angular distribution of elastically scattered neutrons. As for {sup 235}U, covariances were obtained also for the average number of neutrons emitted in fission. The covariances were estimated by using the same methodology that had been used in the JENDL-3.2 evaluation in order to keep a consistency between mean values and their covariances. The least-squares fitting code GMA was used in estimating covariances for reactions of which JENDL-3.2 cross sections had been evaluated by taking account of measurements. In nuclear model calculations, the covariances were calculated by the KALMAN system. The covariance data obtained were compiled in the ENDF-6 format, and will be put into the JENDL-3.2 Covariance File which is one of JENDL special purpose files. (author). 193 refs.

  13. Estimation of multi-group cross section covariances for {sup 235,238}U, {sup 239}Pu, {sup 241}Am, {sup 56}Fe, {sup 23}Na and {sup 27}Al

    Energy Technology Data Exchange (ETDEWEB)

    De Saint Jean, C.; Archier, P.; Noguere, G.; Litaize, O.; Vaglio-Gaudard, C.; Bernard, D.; Leray, O. [CEA, DEN, DER, Cadarache, F-13108 Saint-Paul-lez-Durance (France)

    2012-07-01

    This paper presents the methodology used to estimate multi-group covariances for some major isotopes used in reactor physics. The starting point of this evaluation is the modelling of the neutron induced reactions based on nuclear reaction models with parameters. These latest are the vectors of uncertainties as they are absorbing uncertainties and correlation arising from the confrontation of nuclear reaction model to microscopic experiment. These uncertainties are then propagated towards multi-group cross sections. As major breakthroughs were then asked by nuclear reactor physicists to assess proper uncertainties to be used in applications, a solution is proposed by the use of integral experiment information at two different stages in the covariance estimation. In this paper, we will explain briefly the treatment of all type of uncertainties, including experimental ones (statistical and systematic) as well as those coming from validation of nuclear data on dedicated integral experiment (nuclear data oriented). We will illustrate the use of this methodology with various isotopes such as {sup 235,238}U, {sup 239}Pu, {sup 241}Am, {sup 56}Fe, {sup 23}Na and {sup 27}Al. (authors)

  14. Farmakoterapie generalizované formy epilepsie v populaci na Krnovsku

    OpenAIRE

    POLONIOVÁ, Veronika

    2013-01-01

    Author: Veronika Poloniová Title: Survey the pharmacotherapy for generalised epilepsy - in the area Krnov Form: Master Thesis Name of University: Charles University in Prague, Faculty of Pharmacy in Hradec Králové Degree: Pharmacy Aim: The first aim is to evaluate epilepsy treatment and the established medical practices of generalized forms of epilepsy in the population at Krnov region. Based on the local experience, the second aim is to recommend a combined treatment. Methods: The retrospect...

  15. Modes of strategic technology partnering Formy realizacji strategicznych partnerstw technologicznych

    Directory of Open Access Journals (Sweden)

    Łukasz Puślecki

    2008-06-01

    Full Text Available The aim of the article was to verify the organizational modes of strategic technological partnering. The author used a classification of modes of technology cooperation in terms of inter-organizational dependence to discuss major trends and characteristics of different forms of inter-firm partnering on the basis of the MERIT-CATI database. In the article the following forms of technological cooperation were presented: joint-ventures (JV, R&D pacts, technology exchange agreements and research contracts, customer-supplier relations, X-licensing as well as R&D contracts. The verification of such forms of technology partnering was made in years 1980-1996 on the basis of the empirical material taken from MERIT-CATI database.

  16. Channel-Water Molecular Pattern and 1H, 23Na NMR Spectra Representation in Synthetic Red Beryl%合成红色绿柱石中通道水分子构型及1H和23Na核磁共振谱表征

    Institute of Scientific and Technical Information of China (English)

    亓利剑; 夏义本; 袁心强

    2002-01-01

    以水热法合成贫碱型红色绿柱石和天然富碱、贫碱型绿柱石为研究对象, 采用VU, IR, NMR测试方法, 重点对绿柱石中通道水分子的构型及与钠离子的耦合关系进行研究. 结果表明, 贫碱型水热法合成红色绿柱石中Ⅰ型和Ⅱ型通道水分子并存, 但以Ⅰ型通道水分子的丰度明显占优. 合成红色绿柱石的1H NMR谱属典型的两自旋系, 分属两个独立的共振信号. 中心共振谱峰(δ=1.7×10-6)与Be-OH-Al有关, 为Ⅰ型通道水分子的表征. 伴生共振谱峰(δ=4.9×10-6)与H-O…Na有关, 代表Ⅱ型通道水分子. 23Na NMR谱中心线的化学位移随通道中Na离子浓度的增大而发生有规律的变化, 表现为23Na的共振谱峰自高场区向低场区偏移, 分裂强度增大, 裂距和半峰宽减小. 同时, 1H NMR的峰形自双自旋系向单自旋系转化. 证实合成红色绿柱石中通道水分子与碱金属离子之间存在明显的耦合关系.

  17. Formy kompenzace stresu u vedoucích pracovníků

    OpenAIRE

    Šíma, Jiří

    2010-01-01

    The Bachelor Thesis deals with the issueof stress in managersand with the way managers compensate their stress. This Bachelor thesis concentrated the theoretical part on the causes, clasification, signs, consequences and compensation of stress with focus on work stress related to managers

  18. New and advanced sequences for 23Na NMR imaging, implemented on a 7 T system

    DEFF Research Database (Denmark)

    Laustsen, Christoffer

    2009-01-01

    Introduction   Ischemia occurs when there is little or no blood flow to a given tissue. With the loss of essential oxygen and nutrients, essential function ceases and eventually the cells die. One of the initial functions that breaks down is the active transport of ions and water across the cell...... membrane. Under normal conditions, there exists a large ion gradient of 10 : 1 in favor of the extracellular matrix. Changes in this gradient are normally not observable due to the large excess in the extracellular space and the fast decaying nature of the intracellular ions. If only the intracellular...... sodium is excited then it is possible to follow the sodium gradient over time and to determine the cell state earlier than today.   Methods   1. Implementation of multi quantum coherence techniques for sodium pool quantification   2. Development and implementation of the Non Negative Least Square (NNLS...

  19. Sodium 3D COncentration MApping (COMA 3D) using 23Na and proton MRI

    Science.gov (United States)

    Truong, Milton L.; Harrington, Michael G.; Schepkin, Victor D.; Chekmenev, Eduard Y.

    2014-10-01

    Functional changes of sodium 3D MRI signals were converted into millimolar concentration changes using an open-source fully automated MATLAB toolbox. These concentration changes are visualized via 3D sodium concentration maps, and they are overlaid over conventional 3D proton images to provide high-resolution co-registration for easy correlation of functional changes to anatomical regions. Nearly 5000/h concentration maps were generated on a personal computer (ca. 2012) using 21.1 T 3D sodium MRI brain images of live rats with spatial resolution of 0.8 × 0.8 × 0.8 mm3 and imaging matrices of 60 × 60 × 60. The produced concentration maps allowed for non-invasive quantitative measurement of in vivo sodium concentration in the normal rat brain as a functional response to migraine-like conditions. The presented work can also be applied to sodium-associated changes in migraine, cancer, and other metabolic abnormalities that can be sensed by molecular imaging. The MATLAB toolbox allows for automated image analysis of the 3D images acquired on the Bruker platform and can be extended to other imaging platforms. The resulting images are presented in a form of series of 2D slices in all three dimensions in native MATLAB and PDF formats. The following is provided: (a) MATLAB source code for image processing, (b) the detailed processing procedures, (c) description of the code and all sub-routines, (d) example data sets of initial and processed data. The toolbox can be downloaded at: http://www.vuiis.vanderbilt.edu/~truongm/COMA3D/.

  20. Sodium 3D COncentration MApping (COMA 3D) using (23)Na and proton MRI.

    Science.gov (United States)

    Truong, Milton L; Harrington, Michael G; Schepkin, Victor D; Chekmenev, Eduard Y

    2014-10-01

    Functional changes of sodium 3D MRI signals were converted into millimolar concentration changes using an open-source fully automated MATLAB toolbox. These concentration changes are visualized via 3D sodium concentration maps, and they are overlaid over conventional 3D proton images to provide high-resolution co-registration for easy correlation of functional changes to anatomical regions. Nearly 5000/h concentration maps were generated on a personal computer (ca. 2012) using 21.1T 3D sodium MRI brain images of live rats with spatial resolution of 0.8×0.8×0.8 mm(3) and imaging matrices of 60×60×60. The produced concentration maps allowed for non-invasive quantitative measurement of in vivo sodium concentration in the normal rat brain as a functional response to migraine-like conditions. The presented work can also be applied to sodium-associated changes in migraine, cancer, and other metabolic abnormalities that can be sensed by molecular imaging. The MATLAB toolbox allows for automated image analysis of the 3D images acquired on the Bruker platform and can be extended to other imaging platforms. The resulting images are presented in a form of series of 2D slices in all three dimensions in native MATLAB and PDF formats. The following is provided: (a) MATLAB source code for image processing, (b) the detailed processing procedures, (c) description of the code and all sub-routines, (d) example data sets of initial and processed data. The toolbox can be downloaded at: http://www.vuiis.vanderbilt.edu/~truongm/COMA3D/.

  1. Second-Scale Nuclear Spin Coherence Time of Trapped Ultracold $^{23}$Na$^{40}$K Molecules

    CERN Document Server

    Park, Jee Woo; Loh, Huanqian; Will, Sebastian A; Zwierlein, Martin W

    2016-01-01

    Coherence, the stability of the relative phase between quantum states, lies at the heart of quantum mechanics. Applications such as precision measurement, interferometry, and quantum computation are enabled by physical systems that have quantum states with robust coherence. With the creation of molecular ensembles at sub-$\\mu$K temperatures, diatomic molecules have become a novel system under full quantum control. Here, we report on the observation of stable coherence between a pair of nuclear spin states of ultracold fermionic NaK molecules in the singlet rovibrational ground state. Employing microwave fields, we perform Ramsey spectroscopy and observe coherence times on the scale of one second. This work opens the door for the exploration of single molecules as a versatile quantum memory. Switchable long-range interactions between dipolar molecules can further enable two-qubit gates, allowing quantum storage and processing in the same physical system. Within the observed coherence time, $10^4$ one- and two-...

  2. New and advanced sequences for 23Na NMR imaging, implemented on a 7 T system

    DEFF Research Database (Denmark)

    Laustsen, Christoffer

    2009-01-01

    sodium is excited then it is possible to follow the sodium gradient over time and to determine the cell state earlier than today.   Methods   1. Implementation of multi quantum coherence techniques for sodium pool quantification   2. Development and implementation of the Non Negative Least Square (NNLS......) relaxation analysis for sodium pool quantification   3. Development of novel optimal control quadrupolar coupling band specific excitation experiments   4. Implementation of novel imaging methods for sodium imaging of the "invisible", fast relaxing, sodium pool   5. Implementation of newly proposed...... quadrupolar sodium specific experiments   6. Development of new experiments for sodium quantification purposes   Results   I have shown that it is applicable to use these techniques for in vivo systems on a 7 T experimental scanner. The sodium pool population and the cells under investigation dictate which...

  3. TRADIČNÉ NÁSTROJE VERZUS NOVÉ FORMY A TRENDY V MARKETINGOVEJ KOMUNIKÁCII PODNIKOV NA SLOVENSKU

    Directory of Open Access Journals (Sweden)

    Katarína Grančičová

    2015-12-01

    Full Text Available The changes taking place in the marketing environment of companies since the beginning of the 21st century can be described as fundamental. Marketing reacts to them by changing its orientation and developing its tools, as well as the means of their use in practice. In marketing communication, and especially in establishing the communication mix, the following aspects are becoming key: below-the-line activities, direct marketing, the internet, social networks and creative communication campaigns with the aim of promoting communication among customers (WoM. In the context of the above-mentioned trends and using data from a questionnaire-based survey, this article evaluates the quality of marketing communication of Slovak companies, with an emphasis on the extent of use of current trends and new forms in their marketing communication. This analysis also includes a statistical verification of how the use of new trends and forms of marketing communication depends on selected factors, as well as an evaluation of the impact of these factors on the given area. The selection of factors, such as company size, presence of foreign capital, sector, or primary market orientation of the company, was based on a logical assumption of their potential relevance for the studied subject. The article concludes by summarizing the established facts and outlining both existing problems and their possible solutions. The main finding is that the marketing communication of Slovak companies has not yet seen the expected shift as regards the importance of the individual forms of communication. In other words, traditional forms of communication are still prevailing. The use of alternative forms of marketing is another problem, since they are generally not seen as trustworthy, they are underestimated, and there is a general lack of experience regarding their use.

  4. Vybrané formy prodeje biopotravin - specializované prodejny "zdravé výživy".

    OpenAIRE

    PETROUŠKOVÁ, Romana

    2007-01-01

    At the present time, the trend of consumption of foodstuffs originating from ecological farms has been constantly increasing. The reason for this increase is promotion of healthy life style, growing public awareness of organic food and availability of their sale.The thesis analyzes sale of organic food within specialized shops selling healthy nutrition in the South Bohemian Region. Using questionnaire enquiry, current assortment of organic food, structure of suppliers and their cooperation wi...

  5. Formy právní ochrany počítačových programů

    OpenAIRE

    Šurina, Štefan

    2009-01-01

    ❘❡s✉♠é ✈ ❛♥❣❧✐❝❦é♠ ❥❛③②❝❡✴❆❜str❛❝t ❋♦r♠s ♦❢ ▲❡❣❛❧ Pr♦t❡❝t✐♦♥ ♦❢ ❈♦♠♣✉t❡r Pr♦❣r❛♠s ❚❤❡ ♣✉r♣♦s❡ ♦❢ t❤❡ t❤❡s✐s ✇❛s t♦ ♣r❡s❡♥t ❛ ❝♦♠♣r❡❤❡♥s✐✈❡ ♦✈❡r✈✐❡✇ ♦❢ ✈❛r✐♦✉s ♠❡t❤♦❞s ♦❢ ❝♦♠♣✉t❡r ♣r♦❣r❛♠s✬ ❧❡❣❛❧ ♣r♦t❡❝t✐♦♥✳ ❚❤♦s❡ ♠❡t❤♦❞s ✇❡r❡ r❛♥❣✐♥❣ ❢r♦♠ ❛❝❝❡♣t❡❞ t♦ ♣✉r❡❧② ❤②♣♦t❤❡t✐❝❛❧ ♦♥❡s✳ ❆❝❝♦r❞✐♥❣❧②✱ t❤❡ ♦✉t❧✐♥❡❞ ♠❡t❤♦❞♦❧✲ ♦❣② ✇❛s ❝♦♥str✉❡❞ t♦ ❝♦♠♣❧② ✇✐t❤ t❤✐s s❝❤❡♠❡✳ ❋✐rst ❢♦r♠✱ t❤❡ ❝♦♣②r✐❣❤t ♣r♦✲ t❡❝t✐♦♥ ❛s t❤❡ ♠♦st ❛❝❝❡♣t❡❞ ♦♥❡ ✇❛s t❤❡r❡❢♦r❡ ❞❡❛❧t ✇✐t❤ ♠♦st❧② ❢r♦♠ t❤❡ ♣❡rs♣❡❝t✐✈❡ ♦❢ ✐ts ♣r❛❝t✐❝❛❧ ❛♣♣❧...

  6. The effects of pre-salting methods on salt and water distribution of heavily salted cod, as analyzed by 1H and 23Na MRI, 23Na NMR, low-field NMR and physicochemical analysis

    DEFF Research Database (Denmark)

    Guðjónsdóttir, María; Traoré, Amidou; Jónsson, Ásbjörn

    2015-01-01

    spots with unsaturated brine, increasing the risk of microbial denaturation of the fillets during storage. Since a homogeneous water and salt distribution was not achieved with the studied pre-salting methods, further optimizations of the salting process, including the pre-salting and dry salting steps...

  7. Vitamin D improves viral response in hepatitis C genotype 2-3 na(i)ve patients

    Institute of Scientific and Technical Information of China (English)

    Assy Nimer; Abu Mouch

    2012-01-01

    AIM:To examine whether vitamin D improved viral response and predicted treatment outcome in patients with hepatitis C virus (HCV) genotype 2-3.METttODS:Fifty patients with chronic HCV genotype 2-3 were randomized consecutively into two groups:Treatment group [20 subjects,age 48 ± 14 years,body mass index (BMI) 30 ± 6,65% male],who received 180 μg pegylated α-interferon-2a plus oral ribavirin 800 mg/d (Peg/RBV),together with oral vitamin D3 (Vitamidyne D drops; 2000 IU/d,10 drops/d,normal serum level > 32 ng/mL) for 24 wk; and control group (30 subjects,age 45 ± 10 years,BMI 26 ± 3,60% male),who received identical therapy without vitamin D.HCV RNA was assessed by reverse transcription polymerase chain reaction.Undetectable HCV RNA at 4,12 and 24 wk after treatment was considered as rapid virological response,complete early virological response,and sustained virological response (SVR),respectively.Biomarkers of inflammation were measured.RESULTS:The treatment group with vitamin D had higher BMI (30±6 vs 26 ± 3,P < 0.02),and high viral load (> 400 000 IU/mL,65% vs 40%,P < 0.01)than controls.Ninety-five percent of treated patients were HCV RNA negative at week 4 and 12.At 24 wk after treatment (SVR),19/20 (95%) treated patients and 23/30 (77%) controls were HCV RNA negative (P < 0.001).Baseline serum vitamin D levels were lower at baseline (20 ± 8 ng/mL) and increased after 12 wk vitamin D treatment,to a mean level of (34 ± 11 ng/mL).Logistic regression analysis identified vitamin D supplement [odds ratio (OR) 3.0,95% CI 2.0-4.9,P <0.001],serum vitamin D levels (< 15 or > 15 ng/mL,OR 2.2,P < 0.01),and BMI (< 30 or > 30,OR 2.6,P < 0.01) as independent predictors of viral response.Adverse events were mild and typical of Peg/RBV.CONCLUSION:Low vitamin D levels predicts negative treatment outcome,and adding vitamin D to conventional Peg/RBV therapy for patients with HCV genotype 2-3 significantly improves viral response.

  8. Low-energy resonances in the 22Ne(p,γ23Na reaction directly observed at LUNA

    Directory of Open Access Journals (Sweden)

    Cavanna Francesca

    2015-01-01

    A study of this reaction has been carried out at the Laboratory for Underground Nuclear Astrophysics (LUNA, in the Gran Sasso National Laboratory, using a windowless gas target and two high-purity germanium detectors. Several resonances have been observed for the first time in a direct experiment.

  9. ÉTUDE de la Capture ÉLECTRONIQUE dans la DÉSINTÉGRATION du Nuclide 23Na

    Science.gov (United States)

    Charpak, G.

    L'étude de 22Na est faite avec un compteur Geiger 4π. On met en évidence l'émission d'un rayonnement de très basse énergle, indépendant des rayons β+, complètement absorbé dans un film de quelques microgrammes par centimètre carré d'aluminium on de matière plastique LC 600 et attribué aux électrons Auger d'énergie maximum 0,85 keV, qui suivent la capture électronique. En raison du très faible parcours de ces électrons , nous sommes amené à discuter particulièrement une méthode simple de préparation de sources radloactives minces et uniformes. Nous obtenons la valeta du rapport [ Capture Λ/Emission β+ = (6,5±0,9) pour 100.

  10. MALATANG: MApping the dense moLecular gAs in the sTrongest stAr-formiNg Galaxies

    Science.gov (United States)

    Gao, Yu; Zhang, Zhiyu; Greve, Thomas; MALATANG Team

    2017-01-01

    The MALATANG Large Program is a 390 hr campaign, using the heterodyne array HARP on the JCMT to map theHCN and HCO+ J = 4 - 3 line emission in 23 of the nearest IR-brightest galaxies beyond the Local Group. Theobservations will reach a sensitivity of 0.3 K km/s (~ 4.5 x 10^6 Msun) at linear resolutions of 0.2-2.8kpc. It is thefirst survey to systematically map the distribution of dense molecular gas out to large galactocentric distances in a statisticallysignificant sample of nearby galaxies. MALATANG will bridge the gap, in terms of physical scale and luminosity,between extragalactic (i.e., galaxy-integrated) and Galactic (i.e., single molecular clouds) observations. A primarygoal of the survey is to delineate for the first time the distributed dense gas star-formation relations, as traced by theHCN and HCO+ J = 4-3, on scales of ~1kpc across our targets. Exploring the behaviour of these star-formationrelations in low surface density regions found in the disks as well as in the nuclear regions where surface densitiesare high, will shed new light on whether such environments are host to fundamentally different star-formation modes.The MALATANG data products of resolved HCN and HCO+ J = 4-3 maps of 23 IR-bright local galaxies, will beof great value to the extragalactic community and, in and of themselves, carry significant legacy value. At the moment,about 50% (~195hrs) of the 390hrs of time allocated to MALATANG has been observed. We here show somevery preliminary results as well after introducing our project.

  11. Vybrané právní formy podnikání zahraničního subjektu v ČR

    OpenAIRE

    Pacovský, Martin

    2012-01-01

    The work deals with the topic of entry of foreign entrepreneurs to the Czech market on the background of two different forms of business - franchising and a limited liability company. The main topic concentrates on the comparison of legislation and contractual framework of these two business forms, primarily focusing on intellectual property and the protection of intangible assets. The work presents general legal provisions related to contracts in the field of intellectual property rights, in...

  12. Příčiny trestné činnosti mladistvých a formy jejího postihu.

    OpenAIRE

    SCHREIEROVÁ, Pavlína

    2012-01-01

    Criminal activity of juvenile delinquents is a subject discussed by specialists and employed widely by media. The public often condemn such offenders, under a strong influence of media presenting the issue of criminal activity of young persons from the point of view of consequences only and not from the point of view of causes thereof, without knowing the reason, which led juvenile delinquents to committing criminal activity, and requests fair punishment. Application of repressive, specifical...

  13. Investigation of biomasses and chars obtained from pyrolysis of different biomasses with solid-state 13C and 23Na nuclear magnetic resonance spectroscopy

    NARCIS (Netherlands)

    Link, S.; Arvelakis, S.; Spliethoff, H.; Waard, de P.; Samoson, A.

    2008-01-01

    A number of biomass samples (reed, pine pellets, Douglas fir wood chips, wheat straw, peach stones, and olive residue), pretreated biomass samples (leached wheat straw, leached peach stones, and leached olive residue), as well as their chars obtained by pyrolysis using different heating rates (5, 10

  14. Evaluation of native hyaline cartilage and repair tissue after two cartilage repair surgery techniques with 23Na MR imaging at 7 T: initial experience.

    Science.gov (United States)

    Zbýň, S; Stelzeneder, D; Welsch, G H; Negrin, L L; Juras, V; Mayerhoefer, M E; Szomolanyi, P; Bogner, W; Domayer, S E; Weber, M; Trattnig, S

    2012-08-01

    To compare the sodium normalized mean signal intensity (NMSI) values between patients after bone marrow stimulation (BMS) and matrix-associated autologous chondrocyte transplantation (MACT) cartilage repair procedures. Nine BMS and nine MACT patients were included. Each BMS patient was matched with one MACT patient according to age [BMS 36.7 ± 10.7 (mean ± standard deviation) years; MACT 36.9 ± 10.0 years], postoperative interval (BMS 33.5 ± 25.3 months; MACT 33.2 ± 25.7 months), and defect location. All magnetic resonance imaging (MRI) measurements were performed on a 7 T system. Proton images served for morphological evaluation of repair tissue using the magnetic resonance observation of cartilage repair tissue (MOCART) scoring system. Sodium NMSI values in the repair area and morphologically normal cartilage were calculated. Clinical outcome was assessed right after MRI. Analysis of covariance, t-tests, and Pearson correlation coefficients were evaluated. Sodium NMSI was significantly lower in BMS (P = 0.004) and MACT (P = 0.006) repair tissue, compared to reference cartilage. Sodium NMSI was not different between the reference cartilage in MACT and BMS patients (P = 0.664), however it was significantly higher in MACT than in BMS repair tissue (P = 0.028). Better clinical outcome was observed in BMS than in MACT patients. There was no difference between MOCART scores for MACT and BMS patients (P = 0.915). We did not observe any significant correlation between MOCART score and sodium repair tissue NMSI (r = -0.001; P = 0.996). Our results suggest higher glycosaminoglycan (GAG) content, and therefore, repair tissue of better quality in MACT than in BMS patients. Sodium imaging might be beneficial in non-invasive evaluation of cartilage repair surgery efficacy. Copyright © 2012 Osteoarthritis Research Society International. Published by Elsevier Ltd. All rights reserved.

  15. Magnetic structure of the low-dimensional magnet NaCu{sub 2}O{sub 2}: {sup 63,65}Cu and {sup 23}Na NMR studies

    Energy Technology Data Exchange (ETDEWEB)

    Sadykov, A. F., E-mail: sadykov@imp.uran.ru; Gerashchenko, A. P.; Piskunov, Yu. V.; Ogloblichev, V. V.; Smol’nikov, A. G.; Verkhovskii, S. V.; Buzlukov, A. L.; Arapova, I. Yu. [Russian Academy of Sciences, Institute of Metal Physics, Ural Branch (Russian Federation); Furukawa, Y. [Iowa State University, Ames Laboratory (United States); Yakubovskii, A. Yu. [National Research Centre Kurchatov Institute (Russian Federation); Bush, A. A. [Moscow State Technical University of Radio Engineering, Electronics, and Automation (Russian Federation)

    2014-11-15

    The magnetic structure of a quasi-one-dimensional frustrated NaCu{sub 2}O{sub 2} magnet single crystal is studied by NMR. The spatial orientation of the planar spin spirals in the copper-oxygen Cu{sup 2+}-O chains is determined, and its evolution as a function of the applied magnetic field direction is analyzed.

  16. The Problem of Form in Objects under Redevelopment (On the Basis of Bytom Market Square Redevelopment Design) / Problem Formy W Obiektach Przebudowywanych (Na Przykładzie Projektu Realizacyjnego Przebudowy Bytomskiego Rynku)

    Science.gov (United States)

    Maryńczuk, Paweł

    2015-03-01

    The author believes that if a designer has performed many design or research works entailing solutions to various problems, it is recommendable to consider and become aware of previously used methods whose application might have been unwitting or instinctive. The outcome of such reflection can be worth describing and recording in order to formulate a set of guidelines useful in the future. Such methods, being intuitive in nature, are often tied to the designer's subconsciousness, thus are rarely expressed in a clear manner. By using own methods a designer can prove that space should be composed in a given way in order to address specific needs and defined objectives. All this is aimed at preventing accidental formation of space. An example of reasoning serving the aforementioned purpose can be found in a method referred to as CQC or Composition Quality Control, the application of which facilitates intentional shaping of an architectural piece of work. Autor uważa uważa, że jeśli projektant ma za sobą wiele prac projektowych lub też prac badawczych, które połączone były z rozwiązywaniem różnych problemów, to warto zastanowić się i uświadomić sobie sposoby, które dotychczas - może nieświadomie lub odruchowo - były stosowane. Wynik refleksji warto opisać i zapisać po to, żeby ująć go w układ wskazań na przyszłość. Metody te, mając charakter intuicyjny, często związane są z podświadomością projektanta, w związku z tym rzadko można spotkać je jako wyrażone w sposób wyraźny. Stosując metody własne można dowieść, że przestrzeń winna być komponowana tak, a nie inaczej dla określonych potrzeb i wytyczonych celów tak, aby jej forma nie była przypadkowa. Przykładem takiego rozumowania jest przyjeta metoda KJK, której zastosowanie pomaga w swiadomym kształtowaniu dzieła architektonicznego.

  17. Nieformalne związki jedno i dwupłciowe jako alternatywne formy życia małżeńsko-rodzinnego. Analiza jakości i stabilności relacji

    OpenAIRE

    Jankowiak, Barbara

    2013-01-01

    This thesis presents the characteristics of alternative forms of marriage and family life with special consideration of cohabitation and homosexual relations. These untraditional kinds of partnership relations are more and more common and become new socialization patterns. An analysis was carried out of the satisfaction and stability of informal same- and different sex relations and a comparison of these relations was made to the intimate relations of marriages in order to esta...

  18. Formy poskytování přednemocniční neodkladné péče Armádou České republiky aplikované na zahraniční mise

    OpenAIRE

    Smutná, Jana

    2016-01-01

    The thesis deals with the forms of provision of pre-hospital emergency care (PEC) by paramedics of the Army of the Czech Republic (ACR) and this means above all those forms of PEC which are provided by Combat Medic and Combat Lifesaver (a Combat Lifesaver trained soldier). With regard to the terminology and conception of the thesis comprising the areas of providing PEC, the thesis deals with the levels 1 3 outfeed chain, consequently with the care of the patient to the relevant Role 1 includi...

  19. Ultracold collisions in a dual species 23Na-133Cs magneto-optical trap%磁光阱中超冷钠-铯原子碰撞的实验研究∗

    Institute of Scientific and Technical Information of China (English)

    徐润东; 刘文良; 武寄洲; 马杰; 肖连团; 贾锁堂

    2016-01-01

    The production and research of ultracold heteronuclear molecules have aroused the great interest recently. On the one hand, these molecules are extremely popular in experiments for exploring the collision dynamic behaviors in threshold, photoassociative spectrum and strong dipole-dipole interactions. On the other hand, ultracold polar molecules populated at deeply bound levels in the singlet ground state are the right candidates to investigate quantum memories for quantum simulation, and to study strongly interacting quantum degenerate gases. The precise knowledge of cold collision processes between two different types of alkali atoms is necessary for understanding and utilizing ultracold heteronuclear molecules, sympathetic cooling, and thus formation of two species BEC. The goal of the present investigation is to study the collisions between ultracold sodium atoms and cesium atoms. We systematically demonstrate simultaneously trapping ultracold sodium and cesium atoms in a dual-species magneto-optical trap (MOT). The sodium atom trap loss rate coefficient βNa-Cs is measured as a function of Na trapping laser intensity. At low intensities, the trap loss is dominated by ground-state hyperfine-changing collisions, while at high intensities, collisions involving excited atoms are more important. A strong interspecies collision-induced loss for Na atoms in the MOT is observed. In order to obtain the trap loss coefficient βNa-Cs, we proceed in two steps. First, the Cs repumping laser is blocked to avoid the formation of ultraold Cs atoms. The loading process of Na atoms is recorded when the Cs trapping laser is on. Second, the loading curves of the Na atoms are obtained as Cs atoms are present with the repumping laser beams. The total losses PNa and P′Na are acquired by fitting the two loading curves of trapped Na atoms. Thus, the trap loss coefficientβNa-Cs can be derived from the difference between total losses PNa and P′Na divided by the density of the Cs atoms. The coefficient βNa-Cs decreases in a range of 5–10 mW/cm2, which originates from the hyperfine-state changing (HFC) collision. A Doppler model is used to calculate the Na atom trap depth, in that the atom trap depth and exoergic energy determine the behavior of the collisional trap loss rate coefficient. The three corresponding calculated critical intensities of Na trapping laser are 7.98, 14.82, 16.2 mW/cm2 respectively in the Na-Cs HFC collision process. The first calculated critical intensity value agrees well with the experimental result. Our work provides a valuable insight into HFC collision between Na and Cs atoms and also paves the way for the production of ultracold NaCs molecules using Photoassociation (PA) technology. Furthermore, the experimental results lay a great basis for the obtainments of high sensitive heteronuclear NaCs molecular PA spectrum and the creation of deeply bound ground state molecules.

  20. 德兴斑岩铜矿成矿流体来源及其演化的氧同位素证据%OXYGEN ISOTOPE IMPLICATION FOR SOURCE AND EVOLUTION OF ORE-FORMI NG FLUIDS IN DEXING PPRPHYRY COPPER DEPOSIT, JIANGXI PROVINCE

    Institute of Scientific and Technical Information of China (English)

    金章东; 朱金初; 李福春; 卢新卫; 黄耀生

    2000-01-01

    与原始岩浆组成(δ18O=8.36×10 -3)相比,铜厂花岗闪长斑岩的氧同位素在纵向上存在着3个特征区段:①中段(标高0~80 m之间) 样品接近原始岩浆18O值;②上段:在此之上的样品δ18O值变化区间很大(5. 43~10.86)×10-3,有富集18O的,也有亏损18O的;③下段: 标高在0 m以下深部未/弱蚀变斑岩样品的δ18O值均一,亏损18O,集中在(6.8±0. 5)×10-3范围内.研究表明,这种现象是岩浆流体、深部非岩浆流体和浅部大气降水等3种不同来源的热液流体在不同温度、水/岩比环境下发生水岩交换综合形成的.

  1. Čovjek kao »animal symbolicum« Neki aspekti filozofske antropologije Ernsta Cassirera

    OpenAIRE

    Džinić, Ivo; Vuković, Davor

    2013-01-01

    Ovaj se rad oslanja na filozofsku misao Ernsta Cassirera i određenje čovjeka kao »animal symbolicum«, koje svoj temelj ima upravo u njegovoj filozofiji simboličkih formi. Na temelju Cassirerove teorije o simboličkim formama kao objektivacijama duha, u radu se želi analizirati mogućnost određenja identiteta čovjeka pojedinca kroz odabir i artikulaciju pojedinih simboličkih formi. Pitanje je od kojega se polazi: određuje li se kroz odabir pojedinih simboličkih formi, njihova opsega i intenzitet...

  2. Экслибрисы Юрия Орлова получили признание в Польше

    Index Scriptorium Estoniae

    2009-01-01

    Graafik Juri Orlov sai Poolas toimunud Rahvusvahelisel graafiliste väikevormide ja eksliibriste biennaalil (XIII Międzyanrodowe Biennale Małej Formy Graficznej i Ekslibrisu, Ostrów Wielkopolski 2009) laureaadi tiitli

  3. Экслибрисы Юрия Орлова получили признание в Польше

    Index Scriptorium Estoniae

    2009-01-01

    Graafik Juri Orlov sai Poolas toimunud Rahvusvahelisel graafiliste väikevormide ja eksliibriste biennaalil (XIII Międzyanrodowe Biennale Małej Formy Graficznej i Ekslibrisu, Ostrów Wielkopolski 2009) laureaadi tiitli

  4. Application of the probe Horiba U-23 in the analysis of physical-chemical parameters of groundwater influences on the Osamu Utsumi uranium mine in Caldas-MG; Aplicacao da sonda Horiba U-23 na analise de parametros fisico-quimicos das aguas subterraneas sobre influencia da mina de uranio Osamu Utsumi em Caldas-MG

    Energy Technology Data Exchange (ETDEWEB)

    Moreira, Flavio H.S., E-mail: flaviohsmoreira2@gmail.com [Universidade Federal de Alfenas (UNIFAL), Pocos de Caldas, MG (Brazil); Alberti, Heber L.C.; Silva, Nivaldo C., E-mail: heber@cnen.gov.br, E-mail: ncsilva@cnen.gov.br [Comissao Nacional de Energia Nuclear (LAPOC/CNEN-MG), Pocos de Caldas, MG (Brazil). Laboratorio de Pocos de Caldas; Fleming, Peter Marshall, E-mail: pmf@cnen.gov.br [Centro de Desenvolvimento da Tecnologia Nuclear (CDTN/CNEN-MG), Belo Horizonte, BH (Brazil)

    2013-07-01

    This study presents data on the analysis of physical-chemical parameters of groundwater in the uranium mine Osamu Utsumi, belonging to the Industrias Nucleares do Brasil - INB, in the municipality of Caldas. This work is part of the team responsible for the evaluation of Plano de Recuperacao de Areas Degradadas (PRAD), team consists of researchers from Laboratorio de Pocos de Caldas - LAPOC and of the Centro de Desenvolvimento Tecnologico Nuclear - CDTN, units of the Comissao Nacional de Energia Nuclear - CNEN. Sampling was carried out in eleven wells in the 'bota-fora 4' area and digs mine. Analyses of groundwater quality were performed using the multiparameter probe Horiba U23, recent acquisition of LAPOC. The results characterize the groundwater of ten wells monitored as acidic and with a high electrical conductivity, due to the impacts caused by drainage Mining Acid (DAM)

  5. Rodzina dotknięta przemocą – możliwości i formy pomocy na podstawie badań Specjalistycznych Ośrodków Wsparcia dla Ofiar Przemocy w Rodzinie w regionie dolnośląskim/ Violence Affected Family – Possibilities and Forms of Assistance Based on the Research of Specialist Centers of Support for Victims of Domestic Violence in the Region of Lower Silesia

    Directory of Open Access Journals (Sweden)

    BEATA ŚWIĄTEK

    2011-01-01

    Full Text Available Family has always created an indispensable environment for a man to fulfill his needs and for his development. Family makes our lives meaningful, helps to put plans into practice and to assign goals. The need for belonging to a family constitutes a value dear to all communities. In the literature of the subject there exists a general division into functional and non-functional families. One of the factors determining a family's capability is violence. It influences the quality of the offspring upbringing, family relationships and bonds. In its air social competence of parents declines and their attitude to family-related responsibilities deteriorates. The issue of domestic violence is tackles by specialists of the area of law, psychology, sociology, pedagogy and medicine, who are studying sources and methods of fighting with this phenomenon. Its social damage is so devastating that its unambiguous definition is almost impossible. In the face of a serious threat generated by domestic violence in recent years, there have been held campaigns, workshops, local and nationwide conferences to promote assistance to violence-stricken victims. Preventive schemes have also been developed to restrain violence in schools and local community. Violence affected individuals can seek help in centers founded especially for this purpose and maintained by local councils (MOPS or county councils (PCPR, as well as non-government organizations and associations. A comprehensive support for families suffering from domestic violence is provided by Emergency Intervention Centers and Specialist Centers of Support for Victims of domestic Violence. In the region of Lower Silesia there exist two institutions of such a character, one inWroclaw and the other one in Walbrzych. Their activity involves therapeutic tasks, aid and provision for victims of domestic violence.

  6. NCBI nr-aa BLAST: CBRC-XTRO-01-2845 [SEVENS

    Lifescience Database Archive (English)

    Full Text Available CBRC-XTRO-01-2845 ref|NP_066350.1| NADH dehydrogenase subunit 2 [Malawimonas jakobi...formis] gb|AAG13717.1|AF295546_43 NADH dehydrogenase subunit 2 [Malawimonas jakobiformis] NP_066350.1 0.71 22% ...

  7. Mutagenic Potential of Benzothiazole.

    Science.gov (United States)

    1985-08-01

    I FIED SECURITY CLASIFICATION OF THIS PA ,F ’"one, noe bt.Ped) REPORT DOCUMENTATION PAGE ISEFORE CONMPLIET[Nr. FORMI*%* I PORT NUMOEN 2. VT A CESSION...purchased from Litton Bionetics (Kensington, MD). The optimal titer of this S-9, as determined by Litton Bionetics, was 0.75 mg protein /plate. After

  8. Biblioteka Narodowa Malty

    Directory of Open Access Journals (Sweden)

    Piotrowska Ewa

    2015-12-01

    Full Text Available W artykule przedstawiono historię i współczesne funkcjonowanie Biblioteki Narodowej Malty. Szczególną uwagę zwrócono na liczne formy aktywności naukowo-kulturalnej i działalność edukacyjno-marketingową instytucji.

  9. Mass, Mobility, and the Red Army’s Road to Operational Art, 1918-1936

    Science.gov (United States)

    1987-07-01

    34 associated with the Francophile approach to the teaching of applied tactics which N. N. Golovin championed, were removed thanks to the...germanii," in: Izbrannye proizvedeniia, II, pp. 233-239. 102. G. I. Isserson, Novye formy bor’by (Moscow: Gosvoenizdat, * . 1940 ). Isserson

  10. NCBI nr-aa BLAST: CBRC-DRER-07-0095 [SEVENS

    Lifescience Database Archive (English)

    Full Text Available CBRC-DRER-07-0095 ref|YP_001130163.1| O-antigen polymerase [Prosthecochloris vibrio...formis DSM 265] gb|ABP36661.1| O-antigen polymerase [Prosthecochloris vibrioformis DSM 265] YP_001130163.1 0.33 27% ...

  11. NCBI nr-aa BLAST: CBRC-TTRU-01-1252 [SEVENS

    Lifescience Database Archive (English)

    Full Text Available CBRC-TTRU-01-1252 ref|YP_001130163.1| O-antigen polymerase [Prosthecochloris vibrio...formis DSM 265] gb|ABP36661.1| O-antigen polymerase [Chlorobium phaeovibrioides DSM 265] YP_001130163.1 0.002 27% ...

  12. Rapid detection of malto-oligosaccharide-forming bacterial amylases by high performance anion-exchange chromatography

    DEFF Research Database (Denmark)

    Duedahl-Olesen, Lene; Larsen, K. L.; Zimmermann, W.

    2000-01-01

    High performance anion-exchange chromatography with pulsed amperometric detection was applied for the rapid analysis of malto-oligosaccharides formed by extracellular enzyme preparations from 49 starch-degrading bacterial strains isolated from soil and compost samples. Malto-oligosaccharide-formi...

  13. AcEST: DK947711 [AcEST

    Lifescience Database Archive (English)

    Full Text Available on-ATPase regulat... 39 0.008 sp|P03331|GAG_FRSF5 Gag polyprotein OS=Friend spleen focus-formi... 32 1.3 sp|...LERIV 263 >sp|P03331|GAG_FRSF5 Gag polyprotein OS=Friend spleen focus-forming virus (isolate 502) GN=gag PE=

  14. What is a networked business?

    NARCIS (Netherlands)

    Santana Tapia, R.G.

    2006-01-01

    Due to increasing competitive pressure in their market, many enterprises are implementing changes to the way they conduct business. These changes range from implementing new IT, to redesigning the structure of the organization and entering into all kinds of cooperations with other enterprises, formi

  15. A Psychometric Evaluation of the STAI-Y, BDI-II, and PAI Using Single and Multifactorial Models in Young Adults Seeking Psychoeducational Evaluation

    Science.gov (United States)

    Hill, Benjamin D.; Musso, Mandi; Jones, Glenn N.; Pella, Russell D.; Gouvier, Wm. Drew

    2013-01-01

    A psychometric evaluation on the measurement of self-report anxiety and depression using the Beck Depression Inventory (BDI-II), State Trait Anxiety Inventory, Form-Y (STAI-Y), and the Personality Assessment Inventory (PAI) was performed using a sample of 534 generally young adults seeking psychoeducational evaluation at a university-based clinic.…

  16. Law as Haiku

    Science.gov (United States)

    Olazabal, Ann Morales

    2005-01-01

    Haiku--the short, often nature-oriented poetry form--is generally intended to engage the reader in a single aesthetic moment. Every word, every syllable, counts, resulting in the reader being drawn quickly and intensely into the poet's unique experience. While legal analysis surely differs from haiku, in both its form and its substance, students…

  17. NCBI nr-aa BLAST: CBRC-VPAC-01-1241 [SEVENS

    Lifescience Database Archive (English)

    Full Text Available CBRC-VPAC-01-1241 ref|YP_635818.1| NADH dehydrogenase subunit 4 [Lophiotoma cerithi...formis] gb|ABB72495.1| NADH dehydrogenase subunit 4 [Lophiotoma cerithiformis] YP_635818.1 1.1 23% ...

  18. NCBI nr-aa BLAST: CBRC-BTAU-01-2284 [SEVENS

    Lifescience Database Archive (English)

    Full Text Available CBRC-BTAU-01-2284 ref|YP_635815.1| NADH dehydrogenase subunit 6 [Lophiotoma cerithi...formis] gb|ABB72492.1| NADH dehydrogenase subunit 6 [Lophiotoma cerithiformis] YP_635815.1 0.97 28% ...

  19. Synthesis of conformationally restricted beta-turn mimics

    NARCIS (Netherlands)

    IJsselstijn, Maarten

    2006-01-01

    This thesis aims at developing methods for introducing conformational restriction in Beta-turns, the turn elements present in Beta-sheets. A conformationally restricted peptide might either be formed via incorporation of a bridging diamino acids in a growing peptide chain, or via covalent bond formi

  20. Back Street Bounty

    Institute of Scientific and Technical Information of China (English)

    DAVID SPARKES

    2010-01-01

    @@ As soon as I stepped into the main street of the old city in Pingyao.Shanxi Province.I had a feeling I would not like the place.In fact.I basically made my mind up on the spot that I disliked it.It looked overly touristy.clichéd and lacking in the authenticity I was hoping for.My escape from Beijing's expat scene was looking shaky.

  1. NCBI nr-aa BLAST: CBRC-PCAP-01-1704 [SEVENS

    Lifescience Database Archive (English)

    Full Text Available rogenase subunit 1 [Formica rufa] gb|AAR86956.1| NADH dehydrogenase subunit 1 [Formica rufa...nsis] gb|AAR86998.1| NADH dehydrogenase subunit 1 [Formica pratensis] gb|AAR91932.1| NADH dehydrogenase subunit 1 [Formica rufa...] gb|AAR91934.1| NADH dehydrogenase subunit 1 [Formica rufa] gb|AAR91936.1| NADH dehydrog...enase subunit 1 [Formica rufa] gb|AAR91938.1| NADH dehydrogenase subunit 1 [Formi

  2. Let us learn nuclear power

    Energy Technology Data Exchange (ETDEWEB)

    Jung, Wan Sang

    2006-08-15

    This book teach us nuclear power through nine chapters with recommendation and a prolog. The contents of this book are how did Formi become a scientist? what does atom look like? discover of neutron, what is an isotope?, power in the nuclear, various radiation, artificial nuclear transformation, nuclear fission and clinging atomic nucleus. It also has an appendix on SF story ; an atom bomb war. It explains basic nuclear physic in easy way with pictures.

  3. Morfologičeskie i sintaktiko-semantičeskie modeli v imperativnom značenii

    Directory of Open Access Journals (Sweden)

    Fekete Egon

    2008-01-01

    Full Text Available (ruski V nastojaščej rabote rassmatrivajutsja: (a morfologičeskie formy imperativa v serbskom jazyke i (b drugie grammatičeskie sredstva, s pomošč'ju kotoryh možno vyrazit' imperativnye značenija (prezens, buduščee vremja, glagol'nye pričastija, infinitiv, imena suščestvitel'nye, narečija i meždometija.

  4. An index of forest management intensity based on assessment of harvested tree volume, tree species composition and dead wood origin

    Directory of Open Access Journals (Sweden)

    Tiemo Kahl

    2014-04-01

    Full Text Available Forest management intensity often affects biodiversity, ecosystem processes and ecosystem services. To assess the influence of past management intensity on current ecosystem properties, management intensity must be quantified in a meaningful and reproducible approach. Here we developed the simple yet effective Forest Management Intensity index (ForMI, which is based only on inventory data of the living stand, stumps and dead wood. The ForMI is the sum of three components taking into account: 1. the proportion of harvested tree volume (Iharv, 2. the proportion of tree species that are not part of the natural forest community (Inonat and 3. the proportion of dead wood showing signs of saw cuts (Idwcut. Each component ranges between 0 (no sign of management and 1 (intensive management. Our analysis suggests that the ForMI can be used to assess management intensity in Central European forests for the last 30 to 40 years, depending on decay rates of stumps and dead wood. Our approach was tested using data of 148 forest plots of 1 ha in size in Germany. We found a significant distinction between plots that were previously described as managed and unmanaged as well as between plots comprising trees species of the natural forest community and those with additional, introduced coniferous tree species. We conclude that the index is applicable to a wide range of forest management types, but should not be misinterpreted as an index for old-growth structure.

  5. Observation of a re-entrant phase transition in the molecular complex tris(μ2-3,5-diisopropyl-1,2,4-triazolato-κ2N1:N2trigold(I under high pressure

    Directory of Open Access Journals (Sweden)

    Christopher H. Woodall

    2016-09-01

    Full Text Available We report a molecular crystal that exhibits four successive phase transitions under hydrostatic pressure, driven by aurophilic interactions, with the ground-state structure re-emerging at high pressure. The effect of pressure on two polytypes of tris(μ2-3,5-diisopropyl-1,2,4-triazolato-κ2N1:N2trigold(I (denoted Form-I and Form-II has been analysed using luminescence spectroscopy, single-crystal X-ray diffraction and first-principles computation. A unique phase behaviour was observed in Form-I, with a complex sequence of phase transitions between 1 and 3.5 GPa. The ambient C2/c mother cell transforms to a P21/n phase above 1 GPa, followed by a P21/a phase above 2 GPa and a large-volume C2/c supercell at 2.70 GPa, with the previously observed P21/n phase then reappearing at higher pressure. The observation of crystallographically identical low- and high-pressure P21/n phases makes this a rare example of a re-entrant phase transformation. The phase behaviour has been characterized using detailed crystallographic theory and modelling, and rationalized in terms of molecular structural distortions. The dramatic changes in conformation are correlated with shifts of the luminescence maxima, from a band maximum at 14040 cm−1 at 2.40 GPa, decreasing steeply to 13550 cm−1 at 3 GPa. A similar study of Form-II displays more conventional crystallographic behaviour, indicating that the complex behaviour observed in Form-I is likely to be a direct consequence of the differences in crystal packing between the two polytypes.

  6. Study of the astrophysically important $\\boldsymbol{^{23}\\mathrm{Na}(\\alpha,p)^{26}\\mathrm{Mg}}$ and $\\boldsymbol{^{23}\\mathrm{Na}(\\alpha,n)^{26}\\mathrm{Al}}$ reactions

    CERN Document Server

    Avila, M L; Almaraz-Calderon, S; Ayangeakaa, A D; Dickerson, C; Hoffman, C R; Jiang, C L; Kay, B P; Lai, J; Nusair, O; Pardo, R C; Santiago-Gonzalez, D; Talwar, R; Ugalde, C

    2016-01-01

    The $^{23}$Na$(\\alpha,p)^{26}$Mg and $^{23}$Na$(\\alpha,n)^{26}$Al reactions are important for our understanding of the $^{26}$Al abundance in massive stars. The aim of this work is to report on a direct and simultaneous measurement of these astrophysically important reactions using an active target system. The reactions were investigated in inverse kinematics using $^{4}$He as the active target gas in the detector. We measured the excitation functions in the energy range of about 2 to 6 MeV in the center of mass. We have found that the cross sections of the $^{23}$Na$(\\alpha,p)^{26}$Mg and the $^{23}$Na$(\\alpha,n)^{26}$Al reactions are in good agreement with previous experiments, and with statistical model calculations.

  7. AcEST: DK951331 [AcEST

    Lifescience Database Archive (English)

    Full Text Available |A6R7X5|PAN1_AJECN Actin cytoskeleton-regulatory complex prote... 33 1.5 sp|Q0IHV1|INF2_XENTR Inverted formi...sp|Q95107|WASL_BOVIN Neural Wiskott-Aldrich syndrome protein OS=... 31 7.5 sp|Q6NTV6|INF2_XENLA Inverted for...VG 1419 >sp|Q0IHV1|INF2_XENTR Inverted formin-2 OS=Xenopus tropicalis GN=inf2 PE=

  8. Transkulturalne dimenzije kurikuluma

    OpenAIRE

    Matoš, Nikolina

    2013-01-01

    Da se Bach rodio u Kongu umjesto u Saskoj, ne bi napisao ni takt korala ili sonate, premda možemo jednako tako biti sigurni da bi on svoje sunarodnjake nadmašio u nekoj glazbenoj formi (Kroeber, prema Bruneru, 2000). Neizbježno smo obilježeni okolnostima u kojima smo rođeni i odgajani i stoga slobodno možemo ustvrditi da je kultura čovjekova sudbina. Odgoj unutar određene kulture urezuje se u naše procese mišljenja: um stvara kulturu, ali i kultura stvara um. Čovjek zato treba biti svjestan o...

  9. 各向异性网格下具有数值积分的非协调有限元逼近%Nonconforming Finite Element Approximation on Anisotropic Meshes with Numerical Quadrature

    Institute of Scientific and Technical Information of China (English)

    杨乔; 石东洋

    2006-01-01

    In this paper we mainly discuss the nonconforming finite element method for second order elliptic boundary value problems on anisotropic meshes. By changing the discretization form(i.e., by use of numerical quadrature in the procedure of computing the left load ), we obtain the optimal estimate O(h), which is as same as in the traditional finite element analysis when the load f∈H1(Ω)∩C0(Ω) which is weaker than the previous studies. The results obtained in this paper are also valid to the conforming triangular element and nonconforming Carey's element.

  10. Capitolo III. Fenomeni religiosi all’origine della pittura rupestre

    OpenAIRE

    Piazza, Simone

    2013-01-01

    1– L’eremitismo Il portico della basilica di Sant’Angelo in Formis conserva un breve ciclo pittorico del xii secolo che narra la vita dell’eremita Paolo di Tebe, nato all’inizio del iii secolo (tav. 51 a). Nelle quattro lunette ai lati della porta d’ingresso è raccontato l’incontro che, all’età di centotredici anni, secondo quanto tramandato da san Girolamo, il venerando Paolo avrebbe avuto con il monaco novantenne Antonio venuto in visita presso la sua dimora, una grotta nel deserto della Te...

  11. Research on Mao Zedong and Culture

    Institute of Scientific and Technical Information of China (English)

    1993-01-01

    IN the past 10 years many mon-ographs and papers on researchinto the thought of Mao Ze-dong have appeared,but few ofthem have concentrated on the topicof culture.It seems to me that sincethe research is into Mao Zedong’sthought.it should take the conceptof culture given by Mao Zedong inhis writings as the standard.Maowrites,″Any given culture(as anideological form)is a reflection ofthe politics and economics of a giv-en society.″

  12. Prediction of Backscatter and Emissivity of Snow at Millimeter Wavelengths.

    Science.gov (United States)

    1980-01-01

    IMB00560 701 FORMiATlHOITEMPO,TEMPD,TEMPR’.,3E8.8) 1MB00570 WRITE(6,702) DELO,DELD,DELR IMB00580 102 FORMAT 1lHO’DEL0,DELD, DELF =8,3El8.8) IMB00590 WRITE...IMB01770 COf4MON/PARA4/LTU,LTD,LTF IMB01780 Z TEMPO.TEMPD.TEMPR CHAPACTERISE THE TEPIPERATURE PROFILE. I MBO1 790 C DELO,DELD, DELF CHARACTERIZE THE

  13. Morfologija kristala i rentgenografske osobitosti brazilijanita s različitih lokaliteta

    OpenAIRE

    Čobić, Andrea; Zebec, Vladimir; Scholz, Ricardo; Bermanec, Vladimir; de Brito Barreto, Sandra

    2011-01-01

    Četrdeset i četiri kristala brazilijanita s nekoliko lokaliteta iz Brazila, Ruande i Kanade je mjereno na dvokružnom refleksnom goniometru u svrhu određivanja morfologije. Zabilježeno je 20 formi, od kojih šest do sada nije opisano. Sve plohe u zoni [001] su prutane paralelno kristalografskoj osi c. Sve prutane forme u [001] zoni daju višestruke signale. Forma {110} daje višestruke signale od kojih su dva uvijek oštra. Postoji iznimka gdje na jednom kristalu samo jedna ploha, (110), daje samo...

  14. Diarylethene Materials for Rewritable Volume Holographic Data Storage

    Institute of Scientific and Technical Information of China (English)

    刘国栋; 何庆声; 丁德华; 邬敏贤; 金国藩; 蒲守智; 张复实; 刘学东; 袁鹏

    2003-01-01

    The photochromic diarylethene, 1,2-bis(2-methyl-5-(4-formyIphenyl)-thien-3-yl)perfluorocyclopentene ( 1 a) is studied and its applicable potential in rewritable volume holographic data storage is verified. Holographic recording films of 10-μm thickness have been fabricated. The refractive index modulation (△n = 1.15 × 10-3) between the open- and close-ring forms is detected to be large enough so that the films are suitable for the production of volume holographic storage. The experiments of angle multiplexing and rewriting holograms show that the materials are fit for volume holographic data storage.

  15. Triple-Quantum Filtered NMR Imaging of Sodium -23 in the Human Brain

    Science.gov (United States)

    Keltner, John Robinson

    In the past multiple-quantum filtered imaging of biexponential relaxation sodium-23 nuclei in the human brain has been limited by low signal to noise ratios; this thesis demonstrates that such imaging is feasible when using a modified gradient-selected triple-quantum filter at a repetition time which maximizes the signal to noise ratio. Nuclear magnetic resonance imaging of biexponential relaxation sodium-23 (^{23}Na) nuclei in the human brain may be useful for detecting ischemia, cancer, and pathophysiology related to manic-depression. Multiple -quantum filters may be used to selectively image biexponential relaxation ^{23}Na signals since these filters suppress single-exponential relaxation ^{23}Na signals. In this thesis, the typical repetition times (200 -300 ms) used for in vivo multiple-quantum filtered ^{23}Na experiments are shown to be approximately 5 times greater than the optimal repetition time which maximizes multiple-quantum filtered SNR. Calculations and experimental verification show that the gradient-selected triple-quantum (GS3Q) filtered SNR for ^ {23}Na in a 4% agarose gel increases by a factor of two as the repetition time decreases from 300 ms to 55 ms. It is observed that a simple reduction of repetition time also increases spurious single-quantum signals from GS3Q filtered experiments. Irreducible superoperator calculations have been used to design a modified GS3Q filter which more effectively suppresses the spurious single-quantum signals. The modified GS3Q filter includes a preparatory crusher gradient and two-step-phase cycling. Using the modified GS3Q filter and a repetition time of 70 ms, a three dimensional triple-quantum filtered image of a phantom modelling ^{23} Na in the brain was obtained. The phantom consisted of two 4 cm diameter spheres inside of a 8.5 cm x 7 cm ellipsoid. The two spheres contained 0.012 and 0.024 M ^{23}Na in 4% agarose gel. Surrounding the spheres and inside the ellipsoid was 0.03 M aqueous ^{23}Na. The image

  16. Solid state transformations in consequence of electrospraying--a novel polymorphic form of piroxicam.

    Science.gov (United States)

    Nyström, Maija; Roine, Jorma; Murtomaa, Matti; Mohan Sankaran, R; Santos, Hélder A; Salonen, Jarno

    2015-01-01

    The aim of the research was to verify that electrospraying of piroxicam yielded a new polymorphic form of this drug. In the experiments, piroxicam was dissolved in chloroform and the solution was atomised electrostatically. Subsequently, the charged droplets were neutralised and dried. The solid drug particles were collected and analysed by scanning electron microscopy, X-ray diffraction, differential scanning calorimetry, high performance liquid chromatography, and infrared and Raman spectroscopy. The X-ray diffractogram measured for the electrosprayed piroxicam particles did not match with any of the known piroxicam crystal structures (Cambridge Crystallographic Data Centre). The variable temperature X-ray diffraction showed that the structure recrystallised completely into piroxicam polymorphic formI during heating. No degradation products or solvate removal was detected by high performance liquid chromatography and thermal analysis. The infrared and Raman spectra of the electrosprayed piroxicam were compared to those of formI, and some notable differences in the peak positions, shapes and intensities were detected. The results indicate that electrospraying leads to piroxicam crystallisation in a currently unknown polymorphic form.

  17. Sodium-23 MRI of whole spine at 3 Tesla using a 5-channel receive-only phased-array and a whole-body transmit resonator

    Energy Technology Data Exchange (ETDEWEB)

    Malzacher, Matthias; Kalayciyan, Raffi; Konstandin, Simon; Schad, Lothar R. [Heidelberg Univ., Mannheim (Germany). Computer Assisted Clinical Medicine; Haneder, Stefan [Heidelberg Univ., Mannheim (Germany). Clinical Radiology and Nuclear Medicine; University Hospital of Cologne, Koeln (Germany). Dept. of Radiology

    2016-05-01

    Sodium magnetic resonance imaging ({sup 23}Na MRI) is a unique and non-invasive imaging technique which provides important information on cellular level about the tissue of the human body. Several applications for {sup 23}Na MRI were investigated with regard to the examination of the tissue viability and functionality for example in the brain, the heart or the breast. The {sup 23}Na MRI technique can also be integrated as a potential monitoring instrument after radiotherapy or chemotherapy. The main contribution in this work was the adaptation of {sup 23}Na MRI for spine imaging, which can provide essential information on the integrity of the intervertebral disks with respect to the early detection of disk degeneration. In this work, a transmit-only receive-only dual resonator system was designed and developed to cover the whole human spine using {sup 23}Na MRI and increase the receive sensitivity. The resonator system consisted of an already presented {sup 23}Na whole-body resonator and a newly developed 5-channel receive-only phased-array. The resonator system was first validated using bench top and phantom measurements. A threefold SNR improvement at the depth of the spine (∝7 cm) over the whole-body resonator was achieved using the spine array. {sup 23}Na MR measurements of the human spine using the transmit-only receive-only resonator system were performed on a healthy volunteer within an acquisition time of 10 minutes. A density adapted 3D radial sequence was chosen with 6 mm isotropic resolution, 49 ms repetition time and a short echo time of 540 μs. Furthermore, it was possible to quantify the tissue sodium concentration in the intervertebral discs in the lumbar region (120 ms repetition time) using this setup.

  18. Whole body sodium MRI at 3T using an asymmetric birdcage resonator and short echo time sequence: first images of a male volunteer

    Science.gov (United States)

    Wetterling, Friedrich; Corteville, Dominique M.; Kalayciyan, Raffi; Rennings, Andreas; Konstandin, Simon; Nagel, Armin M.; Stark, Helmut; Schad, Lothar R.

    2012-07-01

    Sodium magnetic resonance imaging (23Na MRI) is a non-invasive technique which allows spatial resolution of the tissue sodium concentration (TSC) in the human body. TSC measurements could potentially serve to monitor early treatment success of chemotherapy on patients who suffer from whole body metastases. Yet, the acquisition of whole body sodium (23Na) images has been hampered so far by the lack of large resonators and the extremely low signal-to-noise ratio (SNR) achieved with existing resonator systems. In this study, a 23Na resonator was constructed for whole body 23Na MRI at 3T comprising of a 16-leg, asymmetrical birdcage structure with 34 cm height, 47.5 cm width and 50 cm length. The resonator was driven in quadrature mode and could be used either as a transceiver resonator or, since active decoupling was included, as a transmit-only resonator in conjunction with a receive-only (RO) surface resonator. The relative B1-field profile was simulated and measured on phantoms, and 3D whole body 23Na MRI data of a healthy male volunteer were acquired in five segments with a nominal isotropic resolution of (6 × 6 × 6) mm3 and a 10 min acquisition time per scan. The measured SNR values in the 23Na-MR images varied from 9 ± 2 in calf muscle, 15 ± 2 in brain tissue, 23 ± 2 in the prostate and up to 42 ± 5 in the vertebral discs. Arms, legs, knees and hands could also be resolved with applied resonator and short time-to-echo (TE) (0.5 ms) radial sequence. Up to fivefold SNR improvement was achieved through combining the birdcage with local RO surface coil. In conclusion, 23Na MRI of the entire human body provides sub-cm spatial resolution, which allows resolution of all major human body parts with a scan time of less than 60 min.

  19. The use Na, Li, K cations for modification of ZSM-5 zewolite to control hydrocarbon cold-start emission

    Energy Technology Data Exchange (ETDEWEB)

    Golubeva V.; Rohatgi U.; Korableva, A.; Anischenko, O.; Kustov, L.; Nissenbaum, V; Viola, M.B.

    2012-08-29

    This paper addresses the problem of controlling hydrocarbon emissions from cold-start of engines by investigating the adsorbents which could adsorb the hydrocarbons at cold temperatures and hold them to 250-300 ?. The materials, that has been studied, are based on the modification of ZSM-5 (SiO{sub 2}/Al{sub 2}O{sub 3} = 35) zeolite with Li, K, Na cations. It has been shown that the introduction of Li, Na and K in an amount that is equivalent to the content of Al in zeolite results in occurrence of toluene temperature desorption peaks at high-temperatures. The toluene temperature desorption curves for 5%Li-ZSM-5 and 2.3%Na-ZSM-5 zeolites are identical and have peak toluene desorption rate between 200 to 400 ?. Upon analysis of toluene adsorption isotherms for 2.3%Na-ZSM-5 and 5%Li-ZSM-5, it was concluded that the toluene diffusion inside of the modified zeolites channels is extremely slow and the sorption capacity of 2.3%Na-ZSM-5 is higher than with 5%Li-ZSM-5. The 2.3%Na-ZSM-5 didn't change toluene temperature programmed desorption (TPD) rate of curve after the treatment in environment with 10% ?{sub 2}? at 750-800 ? for about 28 h. The 2.3%Na-ZSM-5 zeolite is very promising as adsorbent to control the cold-start hydrocarbon emissions.

  20. High-temperature NMR study of zeolite Na-A: Detection of a phase transition

    Energy Technology Data Exchange (ETDEWEB)

    Janssen, R.; Tijink, G.A.H.; Veeman, W.S.; Maesen, T.L.M.; van Lent, J.F. (Univ. of Nijmegen (Netherlands))

    1989-01-26

    The zeolite Linde 4A is studied by {sup 23}Na, {sup 27}al, and {sup 29}Si NMR at temperatures up to 953 K. {sup 23}Na NMR shows that the quadrupole interaction of sodium ions sited at 6-rings decreases when the temperature increases. With the aid of two-dimensional nutation and exchange experiments it can be shown that large-amplitude motions of the sodium ions, which in principle could explain a decrease of quadrupole interactions, do not occur. The decrease of the quadrupole interaction can be interpreted in terms of a phase transition. From a comparison of the NMR spectra of {sup 23}Na and {sup 27}Al it is concluded that the zeolite framework undergoes a major structural change upon increasing the temperature, before the sodium ions are displaced at higher temperatures. The exchange of sodium ions for potassium ions shifts this transition to higher temperatures.

  1. Sodium MRI in human heart: a review.

    Science.gov (United States)

    Bottomley, Paul A

    2016-02-01

    This paper offers a critical review of the properties, methods and potential clinical application of sodium ((23)Na) MRI in human heart. Because the tissue sodium concentration (TSC) in heart is about ~40 µmol/g wet weight, and the (23)Na gyromagnetic ratio and sensitivity are respectively about one-quarter and one-11th of that of hydrogen ((1)H), the signal-to-noise ratio of (23)Na MRI in the heart is about one-6000th of that of conventional cardiac (1)H MRI. In addition, as a quadrupolar nucleus, (23)Na exhibits ultra-short and multi-component relaxation behavior (T1 ~ 30 ms; T2 ~ 0.5-4 ms and 12-20 ms), which requires fast, specialized, ultra-short echo-time MRI sequences, especially for quantifying TSC. Cardiac (23)Na MRI studies from 1.5 to 7 T measure a volume-weighted sum of intra- and extra-cellular components present at cytosolic concentrations of 10-15 mM and 135-150 mM in healthy tissue, respectively, at a spatial resolution of about 0.1-1 ml in 10 min or so. Currently, intra- and extra-cellular sodium cannot be unambiguously resolved without the use of potentially toxic shift reagents. Nevertheless, increases in TSC attributable to an influx of intra-cellular sodium and/or increased extra-cellular volume have been demonstrated in human myocardial infarction consistent with prior animal studies, and arguably might also be seen in future studies of ischemia and cardiomyopathies--especially those involving defects in sodium transport. While technical implementation remains a hurdle, a central question for clinical use is whether cardiac (23)Na MRI can deliver useful information unobtainable by other more convenient methods, including (1)H MRI.

  2. Measurements of gamma rays from keV-neutron resonance capture by odd-Z nuclei in the 2s-1d shell region

    Energy Technology Data Exchange (ETDEWEB)

    Igashira, Masayuki; Lee, Sam Yol; Mizuno, Satoshi; Hori, Jun-ichi [Tokyo Inst. of Tech. (Japan). Research Lab. for Nuclear Reactors; Kitazawa, Hideo

    1998-03-01

    Measurements of gamma rays from keV-neutron resonance capture by {sup 19}F, {sup 23}Na, and {sup 27}Al, which are odd-Z nuclei in the 2s-1d shell region, were performed, using an anti-Compton HPGe spectrometer and a pulsed neutron source by the {sup 7}Li(p,n){sup 7}Be reaction. Capture gamma rays from the 27-, 49-, and 97-keV resonances of {sup 19}F, the 35- and 53-keV resonances of {sup 23}Na, and the 35-keV resonance of {sup 27}Al were observed. Some results are presented. (author)

  3. Optical pumping effect in absorption imaging of F=1 atomic gases

    CERN Document Server

    Kim, Sooshin; Noh, Heung-Ryoul; Shin, Y

    2016-01-01

    We report our study of the optical pumping effect in absorption imaging of $^{23}$Na atoms in the $F=1$ hyperfine spin states. Solving a set of rate equations for the spin populations under a probe beam, we obtain an analytic expression for the optical signal of the $F=1$ absorption imaging. Furthermore, we verify the result by measuring the absorption spectra of $^{23}$Na Bose-Einstein condensates prepared in various spin states with different probe beam pulse durations. The analytic result can be used in quantitative analysis of $F=1$ spinor condensate imaging and readily applied to other alkali atoms with $I=3/2$ nuclear spin such as $^{87}$Rb.

  4. 江蓠原生质体分离成功

    Institute of Scientific and Technical Information of China (English)

    1988-01-01

    由上海水产大学王素娟教授承担的农业部生物技术重点项目“琼胶藻类原生质体分离与培养研究”课题,取得重大进展。养殖系研究生周一红在王素娟教授指导下,对江蓠属龙须菜(Gracilaria Lemanei formis)进行的原生质体分离与培养成株研究,经过反复试验探索,终于获得了大量有活力的原生质体。

  5. PERFORMANS NA TRYBUNACH. O KULTUROWO-DRAMATURGICZNYM ASPEKCIE KIBICOWANIA

    OpenAIRE

    Radosław Kossakowski

    2015-01-01

    Głównym celem poniższego tekstu jest pokazanie, że w pewnym wymiarze działalność i aktywność kibiców noszą znamiona performansu. Uwagę skupiono na „hardcorowych” kibicach piłkarskich (odłam „ultras”, odpowiedzialni za meczowe choreografie) w Polsce. Performanse kibicowskie nie są tylko przedstawieniami estetycznymi, ale stanowią także zróżnicowane pod względem formy reprezentacje treści kulturowych. Prezen-towanie umiejętności czysto technicznych (przygotowanie opraw meczowych itp.) przenika ...

  6. Sprawozdanie z 65th Anniversary Annual Scientific Meeting of American Academy of Forensic Sciences w Waszyngtonie, USA

    Directory of Open Access Journals (Sweden)

    2014-10-01

    Full Text Available W dniach 18-23.02.2013 roku w Waszyngtonie odbyła się organizowana corocznie konferencja naukowa American Academy of Forensic Sciences (AAFS. Tym razem było to już 65. jubileuszowe spotkanie. Motto konferencji brzmiało: „Nauki sądowe: oparte na obserwacji i doświadczeniu, rozwinięte przez edukację i badania”. Miejscem obrad było centrum konferencyjne w hotelu Marriott Wardman Park, składające się z kilku obszernych sal konferencyjnych mogących łącznie pomieścić około 2000 uczestników, z których około 900 prezentowało swoje prace w formie referatów lub posterów.

  7. Visual mining czyli eksploracja informacji za pomocą graficznych reprezentacji

    OpenAIRE

    2015-01-01

    Przykłady eksploracji wiedzy w nauce W odpowiedzi na zalew informacji, w szczególności medialnej, użytkownicy chętnie preferują jej formy wizualne ze względu na właściwości percepcyjne i analityczne. Trudno o systematykę technik wizualizacyjnych, których zróżnicowanie wynika z faktu, że ta metodologia mająca korzenie w naukach komputerowych wykształciła się z wielu kierunków badawczych, m.in.: analiza danych, statystyka, data mining, grafika komputerowa, interakcja człowiek-komputer, kogni...

  8. Kulturno nasledstvo i turiz''m - za konstruiraneto na etnografskite kompleksi

    Directory of Open Access Journals (Sweden)

    Stanka Janeva

    2008-01-01

    Full Text Available (bugarski Interes''t k''m kulturnoto bogatstvo na edin narod e sred osnovnite stimuli za razvitieto na turizma. Tendencijata da se revitalizirat tradiciite na edna ili druga kultura se nabljudava v strani po celija svjat. Vse po-često dnes v procesa na homogenizacija na kulturite različnite obščnosti izobretjavat prostranstva, koito sa svoeobrazni rezervati na kulturnoto nasledstvo. Te predlagat očakvanata kulturna različnost, t''rsena predimno v edno idealizirano minalo. Reaktiviraneto mu i 'živata istorija' stavat vse po-populjarni kato načini za privličane na turistite i provokira konstruiraneto na specifični prostranstva i s''zdavaneto na novi, specialno izgradeni atrakcii. Edna ot naj- atraktivnite formi na prezentirane na kulturnoto nasledstvo e etnografskijat kompleks. .

  9. Forms of Address as Discrete Modal Operators

    Directory of Open Access Journals (Sweden)

    Wojciech Paweł Sosnowski

    2016-12-01

    Full Text Available Forms of Address as Discrete Modal Operators The category of expressions of politeness includes, among others, forms of address. Forms of address express honorification. Honorification can be defined as a special type of meaning that consists of information about the social and interpersonal relations between the speaker and the addressee, the speaker and the hearer, and the speaker and the protagonist of the predication. As far as their place in the syntactic structure is concerned, forms of address can either be integrated with the other elements of a predication or not. However, they are always part of a predication’s semantic structure. Moreover, forms of address convey the speaker’s attitude to the meaning of the predicate that they want to convey, which consequently means that forms of address also carry a modal element. Modality can be defined as a situation in which an individual is in a particular mental state, i.e. exhibits some kind of attitude to a situation or a type of situations. Forms of address can be categorised as modal operators conveying imperatives, requests, suppositions, etc. The term "operator" can be used for a unit of language when it changes the semantic structure of the predication. My research on honorification is mainly based on contemporary corpora, both monolingual and multilingual. In the present study, I analyse forms of address which carry imperative and optative meanings.   Formy adresatywne jako dyskretne operatory modalne W obrębie wyrażeń realizujących funkcje grzecznościowe znajduje się grupa form adresatywnych. Są one częścią kategorii honoryfikatywności rozumianej jako szczególny rodzaj znaczenia zawartego w treści wypowiedzi, informację o towarzysko-społecznej relacji między nadawcą a odbiorcą, nadawcą a słuchaczem oraz nadawcą a bohaterem wypowiedzi. Gramatycznie formy adresatywne mogą być zarówno zintegrowane, jak i niezintegrowane syntaktycznie z resztą wypowiedzi, ale

  10. Espacio y memoria Barcelona en la novela catalana contemporánea

    OpenAIRE

    Łuczak, Barbara

    2011-01-01

    Książka omawia zagadnienia przedstawienia przestrzeni Barcelony we współczesnej powieści katalońskojęzycznej. Przedmiotem analizy są formy uobecniania się tej przestrzeni w wybranych utworach oraz funkcje, jakie pełni ona w procesie konstytuowania się struktury sensów w tekście. Analizie poddano powieści uznanych twórców współczesnej literatury katalońskojęzycznej, opublikowane w drugiej połowie XX wieku i w pierwszej dekadzie wieku XXI. The aim of the book is to study the representation o...

  11. Free Vibration of Piezo-Nanowires Using Timoshenko Beam Theory with Consideration of Surface and Small Scale Effects

    Directory of Open Access Journals (Sweden)

    Oveisi Atta

    2014-03-01

    Full Text Available W pracy badano wpływ efektów powierzchniowych na poprzeczne drgania swobodne nanodrutów piezoelektrycznych (nanowires, NW. Model dynamiczny NW stworzono posługujac sie nielokalna teoria belki Timoszenki. Stosujac te teorie, przy uwzglednieniu zarówno efektów powierzchniowych i efektów nielokalnych, obliczono czestotliwosci drgan własnych nanodrutu. Uzyskane rozwiazanie, o formie zamknietej, pozwala takze obliczyc podstawowe napiecie wyboczenia. Ponadto, zbadano wpływ efektów małej skali na resztkowe naprezenie powierzchniowe i potencjał elektryczny. Wyniki pracy moga byc uzyteczne przy projektowaniu przyrzadów wykorzystujacych nanodruty piezoelektryczne.

  12. Zróżnicowanie parametrów geotechnicznych gruntów spoistych południowo-zachodniej Polski

    Directory of Open Access Journals (Sweden)

    Ewa Wojnicka-Janowska

    2017-09-01

    Full Text Available Podstawą w projektowaniu konstrukcji inżynierskiej lub jej elementów jest znajomość podłoża gruntowego, w szczególności jego parametrów geotechnicznych. Przedstawione opracowanie ma charakter analizy zmienności regionalnej parametrów geotechnicznych gruntów ilastych południowo-zachodniej Polski, pod względem stratygraficznym zaliczonych do utworów neogeńskich. W publikacji wykorzystano bieżące badania własne uzupełnione o archiwalne badania próbek gruntów ilastych pochodzących z Legnicy i Głogowa. Wyniki badań opracowano statystycznie oraz przedstawiono w formie tabelarycznej.

  13. Dynamic Modeling and Analysis of a Lightweight Robotic Manipulator in Joint Space

    Directory of Open Access Journals (Sweden)

    Wolinski Łukasz

    2015-06-01

    Full Text Available W artykule przedstawiono efektywny algorytm do analizy dynamiki manipulatora przestrzennego o otwartym łancuchu kinematycznym. Równania opisujace dynamike układu zapisano w formie algebraiczno-macierzowej w przestrzeni współrzednych złaczowych. Wprowadzona zwarta reprezentacja równan opisujacych ruch manipulatora pozwoliła na rozwiazanie zadania prostego i odwrotnego dynamiki manipulatora w rekursywny i wydajny sposób. Algorytm uogólniono na przypadki analizy dynamiki otwartych łancuchów kinematycznych z dowolna liczba stopni swobody. Opracowane sformułowanie zastosowano do analizy dynamiki manipulatora KUKA LWR o siedmiu stopniach swobody. Zweryfikowano poprawnosc obliczen numerycznych dla testowych przypadków ruchu manipulatora, a wyniki porównano z rezultatami otrzymanymi w pakiecie komercyjnym do obliczen dynamiki układów wieloczłonowych

  14. Effects of phosphorous fertilizer on seedlings growth and nodulation capabilities of some popular agroforestry tree species of Bangladesh

    Institute of Scientific and Technical Information of China (English)

    Mohammad Belal Uddin; Sharif Ahmed Mukul; Mohammed Abu Sayed Arfin Khan; Mohammed Kamal Hossain

    2007-01-01

    An experiment was conducted to assess the effect of Phosphorous (P) fertilizer (I.e. TSP or triple super phosphate @ 80 kg/hm2) on seedling growth and nodulation capabilities of three potentially important agroforestry tree species (Acacia auriculiformis, Albizia lebbeck and Albizia procera) of Bangladesh. The study was conducted in nursery beds with six-month-old polybag seedlings of A. Auriculi formis, A. Lebbeck and A. Procera. The effects of P fertilizer on seedling growth and nodulation were compared with that of the seedlings grown in control (I.e. Unfertilized soil). The observations revealed that the seedling growth was enhanced significantly with the application of P fertilizer.hegrowth was found more pronounced in A. Auriculiformis, whereas it was not apparent and shows depressed growth in case of A. Lebbeck. The study also suggests that the nodulation in terms of nodule number and size was also increased significantly with the application of P fertilizer.

  15. Wybrane Aspekty Zużywania Się Połączeń Wpustowych I Wielowypustowych W Procesie Eksploatacji

    Directory of Open Access Journals (Sweden)

    Gębura Andrzej

    2014-12-01

    Full Text Available W artykule przedstawiono wybrane wady połączeń wielowypustowych: mimośrodowości, przekoszenia, zwiększonych luzów. Przedstawiono znaczenie tych wad dla poprawności funkcjonowania całego zespołu napędowego. Zaprezentowano swoisty katalog tych wad w formie: wizualnego zużycia, pomiarów mechanicznych płaszczyzn przyporu, opisu matematycznego przebiegów dynamiki ruchu takiego połączenia, zobrazowań dla metod FAM-C i FDM-A. Zaznaczono skutki długotrwałej eksploatacji połączeń wielowypustowych o nadmiernym zużyciu dla bezpieczeństwa latania

  16. Study of $\\boldsymbol{(\\alpha,p)}$ and $\\boldsymbol{(\\alpha,n)}$ reactions with a Multi-Sampling Ionization Chamber

    CERN Document Server

    Avila, M L; Almaraz-Calderon, S; Ayangeakaa, A D; Dickerson, C; Hoffman, C R; Jiang, C L; Kay, B P; Lai, J; Nusair, O; Pardo, R C; Santiago-Gonzalez, D; Talwar, R; Ugalde, C

    2016-01-01

    A large number of $(\\alpha,p)$ and $(\\alpha,n)$ reactions are known to play a fundamental role in nuclear astrophysics. This work presents a novel technique to study these reactions with the active target system MUSIC whose segmented anode allows the investigation of a large energy range of the excitation function with a single beam energy. In order to verify the method, we performed a direct measurements of the previously measured reactions $^{17}$O$(\\alpha,n)^{20}$Ne, $^{23}$Na$(\\alpha,p)^{26}$Mg, and $^{23}$Na$(\\alpha,n)^{26}$Al. These reactions were investigated in inverse kinematics using $^{4}$He gas in the detector to study the excitation function in the range of about 2 to 6 MeV in the center of mass. We found good agreement between the cross sections of the $^{17}$O$(\\alpha,n)^{20}$Ne reaction measured in this work and previous measurements. Furthermore we have successfully performed a simultaneous measurement of the $^{23}$Na$(\\alpha,p)^{26}$Mg and $^{23}$Na$(\\alpha,n)^{26}$Al reactions.

  17. Polymorphism of Metallic Sodium under Nanoconfinement.

    Science.gov (United States)

    Uskov, A V; Nefedov, D Yu; Charnaya, E V; Haase, J; Michel, D; Kumzerov, Yu A; Fokin, A V; Bugaev, A S

    2016-01-13

    (23)Na NMR studies of sodium nanoparticles confined to porous glass with the 3.5 nm mean pore size were carried out. The emergence of the second component of the NMR line was observed below 240 K that evidences the occurrence of another modification of metallic sodium. The phase transition temperature is much higher than the martensite transformation temperature in bulk sodium.

  18. A novel ion cooling trap for multi-reflection time-of-flight mass spectrograph

    Energy Technology Data Exchange (ETDEWEB)

    Ito, Y., E-mail: yito@riken.jp [SLOWRI Team, Nishina Accelerator-Based Research Center, RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198 (Japan); University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8577 (Japan); Schury, P. [SLOWRI Team, Nishina Accelerator-Based Research Center, RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198 (Japan); University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8577 (Japan); New Mexico State University, Department Chemistry and Biochemistry, Las Cruces, NM 88003 (United States); Wada, M.; Naimi, S. [SLOWRI Team, Nishina Accelerator-Based Research Center, RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198 (Japan); Smorra, C. [SLOWRI Team, Nishina Accelerator-Based Research Center, RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198 (Japan); Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, D-69117 Heidelberg (Germany); Sonoda, T. [SLOWRI Team, Nishina Accelerator-Based Research Center, RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198 (Japan); Mita, H. [SLOWRI Team, Nishina Accelerator-Based Research Center, RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198 (Japan); University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8577 (Japan); Takamine, A. [SLOWRI Team, Nishina Accelerator-Based Research Center, RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198 (Japan); Aoyama Gakuin University, 4-4-25 Shibuya, Shibuya-ku, Tokyo 150-8366 (Japan); Okada, K. [SLOWRI Team, Nishina Accelerator-Based Research Center, RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198 (Japan); Sophia University, 7-1 Kioi-cho, Chiyoda-ku, Tokyo 102-8554 (Japan); Ozawa, A. [University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8577 (Japan); Wollnik, H. [SLOWRI Team, Nishina Accelerator-Based Research Center, RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198 (Japan); New Mexico State University, Department Chemistry and Biochemistry, Las Cruces, NM 88003 (United States)

    2013-12-15

    Highlights: • Fast cooling time: 2 ms. • High efficiency: ≈27% for {sup 23}Na{sup +} and ≈5.1% for {sup 7}Li{sup +}. • 100% Duty cycle with double trap system. -- Abstract: A radiofrequency quadrupole ion trap system for use with a multi-reflection time-of-flight mass spectrograph (MRTOF) for short-lived nuclei has been developed. The trap system consists of two different parts, an asymmetric taper trap and a flat trap. The ions are cooled to a sufficient small bunch for precise mass measurement with MRTOF in only 2 ms cooling time in the flat trap, then orthogonally ejected to the MRTOF for mass analysis. A trapping efficiency of ≈27% for {sup 23}Na{sup +} and ≈5.1% for {sup 7}Li{sup +} has been achieved.

  19. $\\mathbf{\\alpha}$-induced reaction cross sections in the mass range $\\mathbf{A \\approx 20 - 50}$: a critical review

    CERN Document Server

    Mohr, Peter

    2016-01-01

    In a recent review it was shown that the cross sections of $\\alpha$-induced reactions in the $A \\approx 20 - 50$ mass range follow a general and smooth trend in most cases. For comparison of cross sections of different targets at various energies the method of reduced cross sections $\\sigma_{\\rm{red}}$ and reduced energies $E_{\\rm{red}}$ was used. Four outliers were identified: $^{36}$Ar and $^{40}$Ar with unusally small cross sections and $^{23}$Na and $^{33}$S with unusually large cross sections. New data for $^{23}$Na were presented at this NPA-7 conference; contrary to the previous data, these new data fit into the general systematics. In addition, a relation between the most effective energy $E_0$ for astrophysical reaction rates (the so-called Gamow window) and the reduced energy $E_{\\rm{red}}$ is presented.

  20. Increased cortical and deep grey matter sodium concentration is associated with physical and cognitive disability in relapse-onset multiple sclerosis

    DEFF Research Database (Denmark)

    Brownlee, WJ; Alves Da Mota, Patricia; Prados, Ferran

    =0.40) and visual memory (β=-0.06, 95%CI -0.11, -.0.02, R2=0.19). Conclusion: Sodium accumulation in cortical and deep grey matter may reflect underlying neurodegeneration that is relevant to the development of long-term disability and cognitive impairment in relapse-onset MS. 23Na-MRI may become a secondary......Background: 23Na-MRI is a novel approach to investigating neuroaxonal metabolic dysfunction and neuroaxonal loss in vivo in people with multiple sclerosis (MS). Objective: To investigate the relationship of tissue-specific total sodium concentration (TSC) with disease course and disability...... digit modalities test (SDMT) and tests of verbal and visual memory. Linear regression was used to compare differences in tissue TSC between groups. Multivariable linear regression was used to identify independent associations between TSC and disability with adjustment for age, sex, disease duration...

  1. C-burning via the Trojan horse method

    Science.gov (United States)

    Tumino, A.; Spitaleri, C.; Cherubini, S.; Guardo, L.; Gulino, M.; Indelicato, I.; La Cognata, M.; Lamia, L.; Pizzone, R. G.; Puglia, S. M. R.; Rapisarda, G. G.; Romano, S.; Sergi, M. L.; Spartá, R.

    2017-06-01

    The 12C(14N,α20Ne)2H and 12C(14N,p23Na)2H reactions have been measured at a 14N beam energy of 30.0 MeV. The experiment aims to explore 24Mg excited states that can be populated in the quasi-free reaction off the deuteron in 14N. In particular, the 24Mg excitation region explored in the measurement plays a key role in stellar carbon burning whose cross section is obtained by extrapolating high-energy fusion data. From preliminary results, α and proton channels are clearly identified. In particular, ground and first excited states of 20Ne and 23Na play a major role.

  2. 气溶胶中F和Na分析的外束质子诱发γ射线激发曲线测量%Proton Induced γ-ray Emission Yields for External Beam Analysis of F and Na in Aerosol Samples

    Institute of Scientific and Technical Information of China (English)

    李旭芳; 王广甫; 初钧晗; 于令达

    2013-01-01

    在大气颗粒物离子束分析中,质子诱发γ射线分析(PIGE)作为质子诱发X荧光发射(PIXE)的补充方法,通常用于分析轻元素.为得到外束PIGE定量分析气溶胶样品中F和Na元素的最佳实验条件,本工作在北京师范大学串列加速器上测定了质子能量在1.8~2.9 MeV范围内,核反应19F(p,p'γ)19F(Eγ=110 keV和197 keY)和23Na(p,p'γ)23Na(Ey=440keY)的γ射线激发函数.

  3. Optical pumping effect in absorption imaging of F =1 atomic gases

    Science.gov (United States)

    Kim, Sooshin; Seo, Sang Won; Noh, Heung-Ryoul; Shin, Y.

    2016-08-01

    We report our study of the optical pumping effect in absorption imaging of 23Na atoms in the F =1 hyperfine spin states. Solving a set of rate equations for the spin populations in the presence of a probe beam, we obtain an analytic expression for the optical signal of the F =1 absorption imaging. Furthermore, we verify the result by measuring the absorption spectra of 23Na Bose-Einstein condensates prepared in various spin states with different probe-beam pulse durations. The analytic result can be used in the quantitative analysis of F =1 spinor condensate imaging and readily applied to other alkali-metal atoms with I =3 /2 nuclear spin such as 87Rb.

  4. Study on Soil Fertility of Different Forest Types in Jialing River Source%嘉陵江源头几种林地土壤肥力状况调查

    Institute of Scientific and Technical Information of China (English)

    谭胡燕; 刘瑞英; 杨改河; 任学敏; 王得祥

    2011-01-01

    Based on analysis of soil pH, the content of organic matter and main nutrient at the different levels of soil under seven different forest types (Quercus aliena BI. Var. Acuteserrate, Betula albo-sinensis, Pinus tabulaeformis , Pinus armandii , Abies fargesii , coniferous and broad-leaved mixed forest, shrub forest)in Jialing river of source, this paper studied on soil fertility of different forest types. The result showed that the soil in Pinus armandii, Pinus tabulae formis and coniferous and broad-leaved mixed forest were near neutral, the soil in Quercus aliena BI. Var. Acuteserrate, Betula albo-sinensis and shrub forest were slightly acidic, the soil in Abies fargesii was acidic. The soil pH, the contents of soil organic matter, total N and P, alkali-hydro N and available P tended to decrease with soil depth. The soil fertility was increased in the order of Pinus armandii <Lpinus tabulae formis <coniferous and broad-leaved mixed ioresKQuercus aliena BI. Var. Acuteserrate<shrub forest<Abies fargesii<L Betula albo-sinensis.%以嘉陵江源头风景区7种林型(锐齿栎林、红桦林、油松林、华山松林、巴山冷杉林、针阔混交林及灌木林)土壤为研究对象,通过对林地土壤不同层次pH、有机质及主要养分含量的测定,分析不同林型下土壤肥力的差异状况.结果表明,华山松林、油松林和针阔混交林的土壤趋于中性,锐齿栎林、红桦林、灌木林的土壤趋于弱酸性,而巴山冷杉林的土壤呈酸性.随土壤深度增加,土壤pH升高,土壤有机质、全氮、全磷、碱解氮、有效磷含量均呈下降趋势.土壤综合肥力优劣为华山松林<油松林<针阔混交林<锐齿栎林<灌木林<巴山冷杉林<红桦林.

  5. Faktoring – jedna z hlavních forem financování malých a středních podniků

    Directory of Open Access Journals (Sweden)

    Müllerová Libuše

    2009-12-01

    Full Text Available Faktoring představuje službu, kterou poskytují specializované faktoringové společnosti svým klientům v souvislosti s postoupením nebo se správou pohledávek. Ve své podstatě se jedná o určitý způsob úvěrování, využívaný zejména malými a středními podniky. V praxi existuje několik forem faktoringu v závislosti na tom, do jaké míry přechází na faktora vlastnictví pohledávek a rizika jejich nesplacení. Podle toho se pak faktoringové transakce promítají do účetnictví faktora i klienta. Vzhledem k tomu, že tato služba ani její formy není upravená žádným právním předpisem, postupují faktoringové společnosti často tak, že podmínky ve smlouvách – z důvodu daňových – často zakrývají svojí formou skutečný stav. Uvedený příspěvek základní formy faktoringu vymezuje, popisuje jejich správné účtování včetně daňových dopadů. Factoring is a service, which is offered by specialized factoring agencies to their clients in case of transfer (sale or governance of receivables. In fact, it represents a specific mode of crediting which is mostly preferred by small and medium enterprises. In practices of factoring several forms are differentiated depending on scale of property and risk transfer to the factor. According to these circumstances the factoring transactions are recognized by the factor and the client. The factoring services are not so far regulated by any legal provision. For this reason factoring agencies are proceeding in such a way, that contract conditions – because of tax considerations – hide by their form the substance. The paper describes the factoring forms and interprets their correct recognition on accounting, including tax consequences.

  6. Studies on NaXe Clusters

    Institute of Scientific and Technical Information of China (English)

    2001-01-01

    The chemical shift of 23Na in excimer NaXe was measured by using nuclear magnetic resonance (NMR) spectra, which is in good agreement with the theoretical value obtained by ab initio calculations. The bond length, dissociation energy, dipole of NaXe and Mulliken charges at Na and Xe in NaXe were calculated, respectively. The spectra of ultraviolet (UV) fluorescence and surface-enhanced Raman scattering of NaXe were also measured.

  7. Ground Band and Excited Band of Spin-1 BEC in Cigar Shaped Laser Trap

    Institute of Scientific and Technical Information of China (English)

    PANG Wei; LI Zhi-Bing; BAO Cheng-Guang

    2007-01-01

    The wavefunctions that conserve the total spin are constructed for the fully condensed states and the states with one particle excited. A set of equations are deduced for the spatial longitudinal wavefunctions and the chemical potentials. These equations are solved numerically for 23Na and 87Rb condensates. The deformed trap shows significant effects on the spectrum. This implies that the spin effect of the spinor BEC are more easily detected in an optical trap of larger aspect ratio.

  8. Three dimensional nuclear magnetic resonance spectroscopic imaging of sodium ions using stochastic excitation and oscillating gradients

    Energy Technology Data Exchange (ETDEWEB)

    Frederick, B.deB. [California Univ., Berkeley, CA (United States)]|[Lawrence Berkeley Lab., CA (United States)

    1994-12-01

    Nuclear magnetic resonance (NMR) spectroscopic imaging of {sup 23}Na holds promise as a non-invasive method of mapping Na{sup +} distributions, and for differentiating pools of Na{sup +} ions in biological tissues. However, due to NMR relaxation properties of {sup 23}Na in vivo, a large fraction of Na{sup +} is not visible with conventional NMR imaging methods. An alternate imaging method, based on stochastic excitation and oscillating gradients, has been developed which is well adapted to measuring nuclei with short T{sub 2}. Contemporary NMR imaging techniques have dead times of up to several hundred microseconds between excitation and sampling, comparable to the shortest in vivo {sup 23}Na T{sub 2} values, causing significant signal loss. An imaging strategy based on stochastic excitation has been developed which greatly reduces experiment dead time by reducing peak radiofrequency (RF) excitation power and using a novel RF circuit to speed probe recovery. Continuously oscillating gradients are used to eliminate transient eddy currents. Stochastic {sup 1}H and {sup 23}Na spectroscopic imaging experiments have been performed on a small animal system with dead times as low as 25{mu}s, permitting spectroscopic imaging with 100% visibility in vivo. As an additional benefit, the encoding time for a 32x32x32 spectroscopic image is under 30 seconds. The development and analysis of stochastic NMR imaging has been hampered by limitations of the existing phase demodulation reconstruction technique. Three dimensional imaging was impractical due to reconstruction time, and design and analysis of proposed experiments was limited by the mathematical intractability of the reconstruction method. A new reconstruction method for stochastic NMR based on Fourier interpolation has been formulated combining the advantage of a several hundredfold reduction in reconstruction time with a straightforward mathematical form.

  9. Cold three-body collisions in hydrogen-hydrogen-alkali atomic system

    CERN Document Server

    Wang, Yujun; Esry, B D

    2010-01-01

    We have studied hydrogen-hydrogen-alkali three-body systems in the adiabatic hyperspherical representation. For the spin-stretched case, there exists a single $X$H molecular state when $X$ is one of the bosonic alkali atoms: $^7$Li, $^{23}$Na, $^{39}$K, $^{87}$Rb and $^{133}$Cs. As a result, the {\\em only} recombination process is the one that leads to formation of $X$H molecules, H+H+$X

  10. The design of a double-tuned two-port surface resonator and its application to in vivo Hydrogen- and Sodium-MRI

    Science.gov (United States)

    Wetterling, Friedrich; Högler, Miroslav; Molkenthin, Ute; Junge, Sven; Gallagher, Lindsay; Mhairi Macrae, I.; Fagan, Andrew J.

    2012-04-01

    The design and construction of a two-port surface transceiver resonator for both 1H- and 23Na-MRI in the rodent brain at 7 T is described. Double-tuned resonators are required for accurately co-registering multi-nuclei data sets, especially when the time courses of 1H and 23Na signals are of interest as, for instance, when investigating the pathological progression of ischaemic stroke tissue in vivo. In the current study, a single-element two-port surface resonator was developed wherein both frequency components were measured with the same detector element but with each frequency signal routed along different output channels. This was achieved by using the null spot technique, allowing for optimal variable tuning and matching of each channel in situ within the MRI scanner. The 23Na signal to noise ratio, measured in the ventricles of the rat brain, was increased by a factor of four compared to recent state-of-the-art rat brain studies reported in the literature. The resonator's performance was demonstrated in an in vivo rodent stroke model, where regional variations in 1H apparent diffusion coefficient maps and the 23Na signal were recorded in an interleaved fashion as a function of time in the acute phase of the stroke without having to exchange, re-adjust, or re-connect resonators between scans. Using the practical construction steps described in this paper, this coil design can be easily adapted for MRI of other X-nuclei, such as 17O, 13C, 39K, and 43Ca at various field strengths.

  11. 4TH Mediterranean Workshop and Tropical Meeting "Novel Optical Materials and Applications" NOMA 99.

    Science.gov (United States)

    1999-07-19

    Grand Hotel San Michele Cetraro - Italy, June 4 - 10, 1999 Optical Patterns F.T.Arecchi University of Florence and Ist.Naz. di Ottica Abstract...about I MHz, and an atom 23 Na in an optical (or magneto-optical) trap. Feasible applications include " Foucault pendu- lum" in a trap, rotation...waveguides and microcavities Joseph Zyss, Sophie Brasselet, Michel Dumont, Isabelle Ledoux and Eric Toussaere, Laboratoire de Photonique Quantique et

  12. Gel synthesis of an albite (NaAlSi[sub 3]O[sub 8]) glass: An NMR analysis

    Energy Technology Data Exchange (ETDEWEB)

    Schmelz, C.E.; Stebbins, J.F. (Stanford Univ., CA (United States))

    1993-08-01

    The authors have extended the range and complexity of glasses formed by the combination of metal-alkoxides by synthesizing a clear, homogeneous gel of albite (NaAlSi[sub 3]O[sub 8]) composition and heat-treating it to make a densified glass. Systematic changes in [sup 29]Si, [sup 27]Al, and [sup 23]Na NMR spectra of gels with heat treatment are similar to differences in published spectra of hydrated albite glasses with varying water contents. The [sup 29]Si spectra showed one peak; if Q[sup 3](OH) species are present in the samples, it is not obvious in the spectra. Analysis of the rate of spin transfer in CPMAS experiments suggests a Si-H distance [approximately]15% shorter than that seen in Q[sup 3](OH) species in silica gel. Both the [sup 27]Al and [sup 23]Na peaks show an increase in quadrupolar broadening with heat treatment of the gel. Two peaks are present in the [sup 23]Na spectra for gels heat-treated to 300 and 500[degrees]C, possibly due to sites with different sodium coordination. It is proposed that the differences in spectra can be explained by the differences in volatile content of the samples (including water as either H[sub 2]O or OH[sup [minus

  13. Measurement of proton induced thick target γ-ray yields on B, N, Na, Al and Si from 2.5 to 4.1 MeV

    Science.gov (United States)

    Chiari, M.; Ferraccioli, G.; Melon, B.; Nannini, A.; Perego, A.; Salvestrini, L.; Lagoyannis, A.; Preketes-Sigalas, K.

    2016-01-01

    Thick target yields for proton induced γ-ray emission (PIGE) on low-Z nuclei, namely B, N, Na, Al and Si, were measured for proton energies from 2.5 to 4.1 MeV and emission angles of 0°, 45° and 90°, at the 3 MV Tandetron laboratory of INFN-LABEC in Florence. The studied reactions were: 10B(p,α‧γ)7Be (Eγ = 429 keV), 10B(p,p‧γ)10B (Eγ = 718 keV) and 11B(p,p‧γ)11B (Eγ = 2125 keV) for boron; 14N(p,p‧γ)14N (Eγ = 2313 keV) for nitrogen; 23Na(p,p‧γ)23Na (Eγ = 441 and 1636 keV) and 23Na(p,α‧γ)20Ne (Eγ = 1634 keV) for sodium; 27Al(p,p‧γ)27Al (Eγ = 844 and 1014 keV) and 27Al(p,α‧γ)24Mg (Eγ = 1369 keV) for aluminum; 28Si(p,p‧γ)28Si (Eγ = 1779 keV) and 29Si(p,p‧γ)29Si (Eγ = 1273 keV) for silicon. The PIGE thick target yields have been measured with an overall uncertainty typically better than 10%. The use of the measured thick target yield to benchmark and validate experimental cross sections available in the literature is demonstrated.

  14. Surface modification of g-Al2O3 by sodium ions

    Institute of Scientific and Technical Information of China (English)

    2001-01-01

    1H/23Na double resonance NMR techniques were employed to study the modification of surface hydroxyls on g-Al2O3 by sodium ions. 1H→23Na cross polarization (CP) experiment can resolve three kinds of sodium cations that are closely associated with surface hydroxyl groups, while the signal of deposited salt-Na2CO3, which is not connected to surface hydroxyl groups, is completely suppressed. 1H{23Na} spin echo double resonance experiments reveal the surface modification in more detail. At low Na+ coverage (5%, 10%), the acidic hydroxyl groups are preferentially coordinated with sodium ions, while both the acidic and the basic hydroxyl groups are accessible for sodium ions at high coordination that causes proton of the OH groups to be easily dissolved, which is evidenced by the fact that with calcination temperature of the catalysts increasing, the acidic hydroxyl groups are preferentially removed and only the basic hydroxyl groups remain when the calcination temperature is raised to 600℃.

  15. The Relations h ip with Self Esteem Between Assertiveness Levels of Sub - Elite In - Door Soccer Players

    Directory of Open Access Journals (Sweden)

    Serdar SUCAN

    2015-07-01

    Full Text Available The aim of this study was investigated the relationship with self esteem between assertiveness levels of sub - elite in - door soccer players. For this aim, 18 – 28 aged, 86 male and 91 female athletes studying 7 universities which joined in - door soccer champio nship of Turkish University Sport Federation was participated to study volunteerly. Participants were performed socio - demographic data formi Rathus Assertiveness Schedule and Coopersmith Self - Esteem Inventory. Data were analyzed by using IBM SPSS (versi on 20.0. Spearman Correlation parameter calculated in order to comment the relationship with data, Multiple regretion analysis was performed for the predictive power of self - esteem for assertiveness levels of participants. According to analysis, a positi ve relationship was found between self esteem and assertivenes levels and it was found that self - esteem levels predictived assertiveness levels substantially. As a result of this study, high self - eseteemed athletes could transfer their feelings to others a nd could increase their assertiveness levels. It was known that highly self - esteemed athletes could increase their performance. Therefore, we could say that necessary studies about athletes’ gaining assertiveness behaviors, should take part of primary stud ies of trainers.

  16. Fosfór og hringrás hans á Íslandi

    OpenAIRE

    Snjólaug Tinna Hansdóttir 1991

    2014-01-01

    Náttúruleg hringrás fosfórs í heiminum og þar með talið á Íslandi hefur verið rofin. Með aukinni vinnslu á fosfór úr bergi til áburðarframleiðslu, flæðir fosfór á mun meiri hraða til sjávar en hann gerði í sinni náttúrulegu hringrás. Á Íslandi er fosfór fluttur inn í formi matvæla, fóðurs og áburðar um 155 tonn árlega. Að auki innihalda kjötvörur, fiskmeti, ávextir og grænmeti, sem framleitt er og ræktað hérlendis, um 1.355 tonn af fosfór. Það fosfórmagn sem er útflutt eða er skilað til sjáva...

  17. LADA type diabetes, celiac diasease, cerebellar ataxia and stiff person syndrome. A rare association of autoimmune disorders.

    Science.gov (United States)

    Soós, Zsuzsanna; Salamon, Mónika; Erdei, Katalin; Kaszás, Nóra; Folyovich, András; Szücs, Anna; Barcs, Gábor; Arányi, Zsuzsanna; Skaliczkis, József; Vadasdi, Károly; Winkler, Gábor

    2014-05-30

    Celiac disease--in its typical form--is a chronic immune-mediated enteropathy with typical clinical symptoms that develops against gliadin content of cereal grains, and is often associated with other autoimmune diseases. In cases of atypical manifestation classic symptoms may be absent or mild, and extra-intestinal symptoms or associated syndromes dominate clinical picture. The authors present a longitudinal follow-up of such a case. A 63-years old woman was diagnosed with epilepsy at the age of 19, and with progressive limb ataxia at the age of 36, which was initially thought to be caused by cerebellar atrophy, later probably by stiff person syndrome. At the age 59, her diabetes mellitus manifested with type 2 diabetic phenotype, but based on GAD positivity later was reclassified as type 1 diabetes. Only the last check-up discovered the celiac disease, retrospectively explaining the entire disease course and neurological symptoms. By presenting this case, the authors would like to draw attention to the fact that one should think of the possibility of celiac disease when cerebellar ataxia, progressive neurological symptoms and diabetes are present at the same time. An early diagnosis may help to delay the progression of disease and help better treatment.

  18. A Report of Two Cases of TGM1 Mutations in Iranian Patients with Lamelar Ichthyosis

    Directory of Open Access Journals (Sweden)

    Abolfazl FARAJI

    2011-04-01

    Full Text Available ObjectiveAutosomal Recessive Congenital Ichthyosis (ARCI is a rare, heterogenous keratinization disorder of the skin, classically divided into two clinical subtypes, Lamellar Ichthyosis (LI and Nonbullous Congenital Ichthyosi-formis Erythroderma (NCIE. Lamellar Ichtyosis is caused by mutations in the TGM1 gene that encodes transglutaminase 1 enzyme, which is critical for the assembly of the cornified cell envelope in terminally differentiating keratinocytes. TGM1 is a complex enzyme existing as both cytosolic and membrane-bound forms.Moreover, TGM1 is proteolytically processed, and the major functionally active form consists of a membrane-bound 67/33/10-kDa complex with a myristoylated and palmitoylated amino-terminal 10-kDa membrane anchorage fragment. In this study, all 14 coding exons of TGM1 gene were investigated using PCRsequencing method in three Iranian patients with different phenotypes which are often caused by homozygote or compound heterozygote mutations and a homozygote mutation (G218S in exon 4 and  three heterozygote mutations (R37K, D58N, D86N in exon 2 were observed. The mutation (D86N was seen in two patients simultaneously.Key words: TGM1gene, mutation, ARCI, lamellar, ichthyosis, sequencing.

  19. 龙须菜的生物学作用及应用前景

    Institute of Scientific and Technical Information of China (English)

    刘朝阳; 孙晓庆

    2007-01-01

      龙须菜(Gracilaria lemanei formis)又名江蓠、鹿角菜、凤菜等,是红藻门(Rhodophyta)、江蓠属(Gracilaria)的一个种,是产琼胶藻的优良品种.龙须菜新鲜的藻体具有毒体的风味和营养保健功能,可用作鲍鱼饵料或者加工成海洋蔬菜作为风味食品,并且其多糖成分具有抗肿瘤作用.最近研究还表明,龙须菜具有较强的产氧和氮、磷吸收能力,可作为生物滤器控制水域富营养化,修复养殖环境,净化养殖环境的作用.龙须菜具有很好的开发及应用前景,因此,其研究越来越受到人们的重视.……

  20. miRNA Expression Analyses in Prostate Cancer Clinical Tissues.

    Science.gov (United States)

    Bucay, Nathan; Shahryari, Varahram; Majid, Shahana; Yamamura, Soichiro; Mitsui, Yozo; Tabatabai, Z Laura; Greene, Kirsten; Deng, Guoren; Dahiya, Rajvir; Tanaka, Yuichiro; Saini, Sharanjot

    2015-09-08

    A critical challenge in prostate cancer (PCa) clinical management is posed by the inadequacy of currently used biomarkers for disease screening, diagnosis, prognosis and treatment. In recent years, microRNAs (miRNAs) have emerged as promising alternate biomarkers for prostate cancer diagnosis and prognosis. However, the development of miRNAs as effective biomarkers for prostate cancer heavily relies on their accurate detection in clinical tissues. miRNA analyses in prostate cancer clinical specimens is often challenging owing to tumor heterogeneity, sampling errors, stromal contamination etc. The goal of this article is to describe a simplified workflow for miRNA analyses in archived FFPE or fresh frozen prostate cancer clinical specimens using a combination of quantitative real-time PCR (RT-PCR) and in situ hybridization (ISH). Within this workflow, we optimize the existing methodologies for miRNA extraction from FFPE and frozen prostate tissues and expression analyses by Taqman-probe based miRNA RT-PCR. In addition, we describe an optimized method for ISH analyses formiRNA detection in prostate tissues using locked nucleic acid (LNA)- based probes. Our optimized miRNA ISH protocol can be applied to prostate cancer tissue slides or prostate cancer tissue microarrays (TMA).

  1. Field evaluation of durum wheat landraces for prevailing abiotic and biotic stresses in highland rainfed regions of Iran

    Institute of Scientific and Technical Information of China (English)

    Reza Mohammadi; Behzad Sadeghzadeh; Hasan Ahmadi; Nowzar Bahrami; Ahmed Amri

    2015-01-01

    Biotic and abiotic stresses are major limiting factors for high crop productivity worldwide. A landrace collection consisting of 380 durum wheat (Triticum turgidum L. var. durum) entries originating in several countries along with four check varieties were evaluated for biotic stresses:yellow rust (Puccinia stri formis Westendorf f. sp. tritici) and wheat stem sawfly (WSS) Cephus cinctus Norton (Hymenoptera:Cephidae), and abiotic stresses:cold and drought. The main objectives were to (i) quantify phenotypic diversity and identify variation in the durum wheat landraces for the different stresses and (ii) characterize the agronomic profiles of landraces in reaction to the stresses. Significant changes in reactions of landraces to stresses were observed. Landraces resistant to each stress were identified and agronomically characterized. Percentage reduction due to the stresses varied from 11.4% (yellow rust) to 21.6% (cold stress) for 1000-kernel weight (TKW) and from 19.9 (yellow rust) to 91.9%(cold stress) for grain yield. Landraces from Asia and Europe showed enhanced genetic potential for both grain yield and cold tolerance under highland rainfed conditions of Iran. The findings showed that TKW and yield productivity could be used to assess the response of durum wheat landraces to different stresses. In conclusion, landraces showed high levels of resistance to both biotic and abiotic stresses, and selected landraces can serve in durum wheat breeding for adaptation to cold and drought-prone environments.

  2. Antropodidaktický přístup k interakcím učitel–žák ve výuce matematiky na 1. stupni školy

    Directory of Open Access Journals (Sweden)

    Bernard Sarrazy

    2013-10-01

    Full Text Available Článek se zabývá interakcemi jako jednou z hlavních složek učitelova didaktického působení. První část je věnována charakterizaci formy těchto interakcí ve třech různých didaktických kontextech: v „předávaném kontextu", „intermediálním kontextu" a „institucionalizujícím kontextu". Pozornost se soustřeďuje na funkce, které interakce plní v didaktickém systému, a jejich kognitivní efekty. Druhá část se zabývá fatickými interakcemi; jejím cílem je ukázat, jak učitelé postupují, jestliže se snaží sjednotit své vzdělávací poslání se specifickými problémy, které vznikají z různorodosti potřeb jednotlivých žáků.

  3. The 2-10 keV luminosity as a Star Formation Rate indicator

    CERN Document Server

    Ranalli, P; Setti, G

    2003-01-01

    Radio and far infrared luminosities of star-forming galaxies follow a tight linear relation. Making use of ASCA and BeppoSAX observations of a well-defined sample of nearby star-forming galaxies, we argue that tight linear relations hold between the X-ray, radio and far infrared luminosities. The effect of intrinsic absorption is investigated taking NGC3256 as a test case. It is suggested that the hard X-ray emission is directly related to the Star Formation Rate. Star formation processes may also account for most of the 2-10 keV emission from LLAGNs of lower X-ray luminosities (for the same FIR and radio luminosity). Deep Chandra observations of a sample of radio-selected star-forming galaxies in the Hubble Deep Field North show that the same relation holds also at high (0.2< z< 1.3) redshift. The X-ray/radio relations also allow a derivation of X-ray number counts up to very faint fluxes from the radio Log N-Log S, which is consistent with current limits and models. Thus the contribution of star-formi...

  4. Analyses of the Current Rural Elementary School Music Education Teaching Present Situation and Countermeasures of Application%浅析目前农村小学音乐教育教学现状及应用对策

    Institute of Scientific and Technical Information of China (English)

    袁福和

    2014-01-01

    Music art as the main content of art form,is one of the important performance art form. But development in economy of rural schools,due to the influence of early education,music class in the countryside as long as with simple music element, its status is also not high, the status quo of the rural class,with the time development,on the basis of these problems,the rural music education teaching situation to make some discussions.%音乐艺术①作为艺术形式的主要内容,是艺术表现形式的重要表现手段。但在经济发展不景气的农村学校,由于早期教育的影响,音乐在农村课堂上只能以简单的音乐元素表现出来,其地位也不高,这些农村课堂上的现状,与时代发展相背离。依据这些问题,对农村的音乐教育教学现状做出一些探讨。

  5. Modelovanje određenih elemenata digitalnih atlasnih karata sa aspekta geografskih informacionih sistema/Modeling certain digital atlas map elements from the geographical information systems aspect

    Directory of Open Access Journals (Sweden)

    Nikola S. Stamenković

    2014-10-01

    Full Text Available Atlasi i GIS važni su elementi prikaza modela životnog prostora. U radu je predstavljen model upotrebe GIS tehnologije u izradi određenih elemenata atlasnih karata. To podrazumeva definisanje osnovnih matematičkih elemenata karata digitalnog atlasa i mogućih struktura i formi baza prostornih podataka. Geografski elementi atlasnih karata, pretprocesiranje u GIS i strukturiranje karata digitalnog atlasa podržano GIS-om čine osnovne teme rada. Naglašava se mesto GIS tehnologije u procesu izrade atlasnih karata sa dva aspekta. Jedan aspekt predstavlja okvir geografskih informacionih sistema i mogućnosti koje pružaju, a drugi aspekt predstavljaju kartografske metode, odnosno sistem kartografskih metoda u čijem okruženju se izrađuju atlasne karte. / Besides geographic maps, atlases represent the most important cartographic models of environment. Nowadays, contemporary geographic information systems (GISare increasingly used ' in planning, designing and predicting the conditions and processes of complex dynamic spatial systems. Collecting data and information for a specific geographical map and GIS represents its basis.

  6. Podnikatelský záměr - Založení hudebního klubu

    OpenAIRE

    Roček, Pavel

    2016-01-01

    Bakalářská práce se zabývá sestavením podnikatelského záměru na realizaci hudebního klubu. Teoretická část práce se zaměřuje na založení vhodné právní formy podnikání, analýzu konkurenčního prostředí, marketingový mix, SWOT analýzu, SLEPT analýzu a rozpočty. Praktická část vychází z teoretických poznatků a osobních zkušeností s vedením hudebního klubu a hostinské činnosti všeobecně. This bachelor’s thesis focuses on setting up a business plan for a music club start-up. The theoretical part...

  7. Základní anorganické výroby Tvorba e-learningových studijních materiálů

    OpenAIRE

    Valenčík, Jan

    2009-01-01

    Bakalářská práce pojednává o e-learningu (objasnění pojmu, formy, využití, klady a zápory), o systémech LMS, LCMS a základních prvcích pro tvorbu interaktivních učebních pomůcek, které napomáhají zvýšit kvalitu e-learningu. Výstupem je výukový software obsahující vizuální animace pro výuku základních anorganických výrob v chemickém průmyslu (výrobu kyselin, kovů, plynů, atd.) určených zejména pro studenty 1. ročníku FCH VUT v Brně, ale i pro širokou veřejnost. Vizualizace byly vypracovány pom...

  8. A laboratorial study on influence of alkaline and oxidative environment on preservation of Pinus tabulaeformis pollen

    Institute of Scientific and Technical Information of China (English)

    Fang TIAN; Xianyong CAO; Qinghai XU; Yuecong LI

    2009-01-01

    Different sedimentary settings can influence preservation of pollens, which would lead to mis-interpretation of fossil pollen spectrum. This study investigates the influence on the preservation of Pinus tabulaeformis pollen by simulating alkaline and oxidative environment in the laboratory. There was no obvious change in the content ofPinus tabulaeformis pollen while comparing the original with the ones that were immersed with 10% NaOH liquor for ten days, or boiled for five hours, and or boiled with 20%-30% NaOH for one hour,respectively. However, the pollen fossils were obviously corroded and eroded after being boiled with 40% NaOH for one hour and were seriously corroded after five hours. The result indicates that Pinus tabulaeformis pollen is quite durable in alkaline environment and heating condition within a shorter period of time, although alkaline environment has a disadvantage for its preservation. We also tested the influence of oxidation on Pinus tabulae-formis pollen preservation with KMnO4 as oxidant. The result presents that the number of remaining Pinus tabulaeformis pollen grains decreased quickly after being dipped in KMnO4 along with extending the reaction time and reinforcing oxidant. The rate of remnant pollen grains was less than 1% after being dipped with 2% KMnO4 for one hour. It is suggested that oxidative environment has stronger influence on Pinus tabulaeformis pollen preserva tion than alkaline environment.

  9. Moderní e-learning systém na platformě JAVA

    OpenAIRE

    Hák, Tomáš

    2008-01-01

    Tato diplomová práce se zabývá e-learningem – elektronickou formou výuky. Rozebírá detailněji klady i zápory této nové formy přístupu ke vzdělávání. Zároveň jsou popsány možnosti některých vybraných e-learningových systémů a jejich základní struktury. V druhé části této práce jsou uvedeny základní principy a možnosti programovacího jazyka Java. V tomto jazyce je následně navrhnut vlastní koncept systému, který by umožňoval základní správu a ovládání e-learningu. Je popsán průběh komunikace me...

  10. Application of full 42 Factorial Design for the Development and Characterization of Insecticidal Soap from Neem Oil

    Directory of Open Access Journals (Sweden)

    A. S. KOVO

    2006-01-01

    Full Text Available The aim of this paper was to investigate the extraction, characterization and production of insecticidal soap from Neem oil using full 42 factorial design. Soxhlet extractor was used for the extraction purpose and two solvent was chosen to determine which is better. N-hexane gives a Neem oil yield of 45.43% while ethanol gives a yield of 46.38%, confirming the earlier literature result giving ethanol as better solvent for Neem oil extraction. The basic properties of the oil were determined as follows, saponification value 215.95ml/g, acid value 1.122g/mol, unsaponifiable matter 19.66 etc. The Neem oil was found to have a colour of golden yellow due to the presence of Nimbidin.Full 42 factorial design and mathematical model was applied to the extraction process and a first order regression equation of the form:Y = 9.548 + 0.144X1 + 0.1931X2 + 0.1892 X12was obtained growing the individual effect of time and solvent type as parameter and their interaction in the entire extraction process the Neem insecticidal soap was found to be effective in insect and pest control.

  11. Tracking Sodium-Antimonide Phase Transformations in Sodium-Ion Anodes: Insights from Operando Pair Distribution Function Analysis and Solid-State NMR Spectroscopy.

    Science.gov (United States)

    Allan, Phoebe K; Griffin, John M; Darwiche, Ali; Borkiewicz, Olaf J; Wiaderek, Kamila M; Chapman, Karena W; Morris, Andrew J; Chupas, Peter J; Monconduit, Laure; Grey, Clare P

    2016-02-24

    Operando pair distribution function (PDF) analysis and ex situ (23)Na magic-angle spinning solid-state nuclear magnetic resonance (MAS ssNMR) spectroscopy are used to gain insight into the alloying mechanism of high-capacity antimony anodes for sodium-ion batteries. Subtraction of the PDF of crystalline NaxSb phases from the total PDF, an approach constrained by chemical phase information gained from (23)Na ssNMR in reference to relevant model compounds, identifies two previously uncharacterized intermediate species formed electrochemically; a-Na(3-x)Sb (x ≈ 0.4-0.5), a structure locally similar to crystalline Na3Sb (c-Na3Sb) but with significant numbers of sodium vacancies and a limited correlation length, and a-Na(1.7)Sb, a highly amorphous structure featuring some Sb-Sb bonding. The first sodiation breaks down the crystalline antimony to form first a-Na(3-x)Sb and, finally, crystalline Na3Sb. Desodiation results in the formation of an electrode formed of a composite of crystalline and amorphous antimony networks. We link the different reactivity of these networks to a series of sequential sodiation reactions manifesting as a cascade of processes observed in the electrochemical profile of subsequent cycles. The amorphous network reacts at higher voltages reforming a-Na(1.7)Sb, then a-Na(3-x)Sb, whereas lower potentials are required for the sodiation of crystalline antimony, which reacts to form a-Na(3-x)Sb without the formation of a-Na(1.7)Sb. a-Na(3-x)Sb is converted to crystalline Na3Sb at the end of the second discharge. We find no evidence of formation of NaSb. Variable temperature (23)Na NMR experiments reveal significant sodium mobility within c-Na3Sb; this is a possible contributing factor to the excellent rate performance of Sb anodes.

  12. Measurement of proton induced thick target γ-ray yields on B, N, Na, Al and Si from 2.5 to 4.1 MeV

    Energy Technology Data Exchange (ETDEWEB)

    Chiari, M., E-mail: chiari@fi.infn.it [INFN-Florence and Department of Physics and Astronomy, University of Florence, via G. Sansone 1, 50019 Sesto Fiorentino (Italy); Ferraccioli, G.; Melon, B.; Nannini, A.; Perego, A.; Salvestrini, L. [INFN-Florence and Department of Physics and Astronomy, University of Florence, via G. Sansone 1, 50019 Sesto Fiorentino (Italy); Lagoyannis, A.; Preketes-Sigalas, K. [Tandem Accelerator Laboratory, Institute of Nuclear and Particle Physics, NCSR “Demokritos”, 153.10 Aghia Paraskevi, Athens (Greece)

    2016-01-01

    Thick target yields for proton induced γ-ray emission (PIGE) on low-Z nuclei, namely B, N, Na, Al and Si, were measured for proton energies from 2.5 to 4.1 MeV and emission angles of 0°, 45° and 90°, at the 3 MV Tandetron laboratory of INFN-LABEC in Florence. The studied reactions were: {sup 10}B(p,α′γ){sup 7}Be (E{sub γ} = 429 keV), {sup 10}B(p,p′γ){sup 10}B (E{sub γ} = 718 keV) and {sup 11}B(p,p′γ){sup 11}B (E{sub γ} = 2125 keV) for boron; {sup 14}N(p,p′γ){sup 14}N (E{sub γ} = 2313 keV) for nitrogen; {sup 23}Na(p,p′γ){sup 23}Na (E{sub γ} = 441 and 1636 keV) and {sup 23}Na(p,α′γ){sup 20}Ne (E{sub γ} = 1634 keV) for sodium; {sup 27}Al(p,p′γ){sup 27}Al (E{sub γ} = 844 and 1014 keV) and {sup 27}Al(p,α′γ){sup 24}Mg (E{sub γ} = 1369 keV) for aluminum; {sup 28}Si(p,p′γ){sup 28}Si (E{sub γ} = 1779 keV) and {sup 29}Si(p,p′γ){sup 29}Si (E{sub γ} = 1273 keV) for silicon. The PIGE thick target yields have been measured with an overall uncertainty typically better than 10%. The use of the measured thick target yield to benchmark and validate experimental cross sections available in the literature is demonstrated.

  13. Nonconventional MRI and microstructural cerebral changes in multiple sclerosis

    DEFF Research Database (Denmark)

    Enzinger, Christian; Barkhof, Frederik; Ciccarelli, Olga;

    2015-01-01

    in the acquisition and analysis of such imaging data, and numerous studies have used these tools to probe tissue alterations associated with MS. Other MRI-based techniques-such as myelin-water imaging, (23)Na imaging, magnetic resonance elastography and magnetic resonance perfusion imaging-might also shed new light...... on disease-associated changes. This Review summarizes the rapid technical progress in the use of MRI in patients with MS, with a focus on nonconventional structural MRI. We critically discuss the present utility of nonconventional MRI in MS, and provide an outlook on future applications, including clinical...

  14. Quantitative Sodium MR Imaging at 7 T: Initial Results and Comparison with Diffusion-weighted Imaging in Patients with Breast Tumors.

    Science.gov (United States)

    Zaric, Olgica; Pinker, Katja; Zbyn, Stefan; Strasser, Bernhard; Robinson, Simon; Minarikova, Lenka; Gruber, Stephan; Farr, Alex; Singer, Christian; Helbich, Thomas H; Trattnig, Siegfried; Bogner, Wolfgang

    2016-07-01

    Purpose To investigate the clinical feasibility of a quantitative sodium 23 ((23)Na) magnetic resonance (MR) imaging protocol developed for breast tumor assessment and to compare it with 7-T diffusion-weighted imaging (DWI). Materials and Methods Written informed consent in this institutional review board-approved study was obtained from eight healthy volunteers and 17 patients with 20 breast tumors (five benign, 15 malignant). To achieve the best image quality and reproducibility, the (23)Na sequence was optimized and tested on phantoms and healthy volunteers. For in vivo quantification of absolute tissue sodium concentration (TSC), an external phantom was used. Static magnetic field, or B0, and combined transmit and receive radiofrequency field, or B1, maps were acquired, and image quality, measurement reproducibility, and accuracy testing were performed. Bilateral (23)Na and DWI sequences were performed before contrast material-enhanced MR imaging in patients with breast tumors. TSC and apparent diffusion coefficient (ADC) were calculated and correlated for healthy glandular tissue and benign and malignant lesions. Results The (23)Na MR imaging protocol is feasible, with 1.5-mm in-plane resolution and 16-minute imaging time. Good image quality was achieved, with high reproducibility (mean TSC values ± standard deviation for the test, 36 mmol per kilogram of wet weight ± 2 [range, 34-37 mmol/kg]; for the retest, 37 mmol/kg ± 1 [range, 35-39 mmol/kg]; P = .610) and accuracy (r = 0.998, P breast tissue were 35 mmol/kg ± 3 and 18 mmol/kg ± 3, respectively. In malignant lesions (mean size, 31 mm ± 24; range, 6-92 mm), the TSC of 69 mmol/kg ± 10 was, on average, 49% higher than that in benign lesions (mean size, 14 mm ± 12; range, 6-35 mm), with a TSC of 47 mmol/kg ± 8 (P = .002). There were similar ADC differences between benign ([1.78 ± 0.23] × 10(-3) mm(2)/sec) and malignant ([1.03 ± 0.23] × 10(-3) mm(2)/sec) tumors (P = .002). ADC and TSC were

  15. Optical properties of a GaAlAs superluminescent diode

    Energy Technology Data Exchange (ETDEWEB)

    Dutta, N.K.; Deimel, P.

    1983-04-01

    The optical properties of a GaAlAs superluminescent diode (SLD) are described. The spectra of this device exhibit a large number of longitudinal modes. The coupling efficiency into a 0.23 NA 50 ..mu..m diameter graded index fiber is about 30 percent. The current required for constant light output at a temperature T can be written as I(T) about I /SUB o/ exp (T/T/sub 2/) where T/sub 2/ about 120 K. A model of the SLD is described.

  16. Nuclear magnetic resonance studies on bentonite in complex mixed systems

    OpenAIRE

    2012-01-01

    In this work 23Na MAS NMR was validated as a successful quantitative method for studies of exchanging sodium in bentonites useful, in particular, for studies of ion-exchange kinetics. Na-enriched bentonites equilibrated in a re-circulated process water at iron-oxide pelletizing plants may acquire properties of Ca-bentonites after already 20 minutes of the equilibration time, since >50 % of sodium ions will be exchanged by calcium ions during first minutes of bentonite placed in contact wit...

  17. Spin dynamics on cyclic iron wheels in high magnetic fields; Spindynamik an zyklischen Eisen-Raedern in hohen magnetischen Feldern

    Energy Technology Data Exchange (ETDEWEB)

    Schnelzer, Lars

    2008-02-15

    In the present thesis the spin dynamics of cyclic spin-cluster compounds, the so called ''ferric wheels'' were studied by means of the NMR. In the iron wheels Li/Na rate at Fe{sub 6}(tea){sub 6} and Cs rate at Fe{sub 8}(tea){sub 8} as probes of NMR both the protons and the centrally lying alkali atoms {sup 7}Li, {sup 23}Na, and {sup 133}Cs were available. For this purpose measurements in the magnetic field region up to B=20 T and at temperatures between room temperature and T=50 mK were performed. The longitudinal relaxation rate was temperature dependently studied at two field values on the lithium cluster and a frequency independent maximum of the relaxation rate at a temperature of T{approx}30 K resulted. Different behaviour showed the measurement on the sodium cluster. the longitudinal relaxation rate slopes linearly with the temperature and shows no maximum. The two quadrupole satellites of the {sup 23}Na could be resolved. From the distance of the satellites to the central transition both on the field gradient of the iron ring and on the orientation of the symmetry axis to the external magnetic field could be concluded. The determined field gradient of the Na rate at Fe{sub 6}(tea){sub 6} of eq=4.78(11).10{sup 20} V/m{sup 2} was in very good agreement with the present theoretically calculated value. The orientation of the crystal was determined to {theta}(c,B)=62.8 . The very low splitting of the {sup 7}Li NMR spectrum of the lithium cluster allows to give as upper limit for the value of the field gradient eq=1.82(11).10{sup 20} V/m{sup 2}. From the seven lines of the cesium spectrum theoretically to be expected five were resolved. The evaluation yielded for the cesium ring a value of eq=-1.3(1).10{sup 21} V/m{sup 2}. The study of the field-dependent line position of the {sup 23}Na NMR line led to the determination of the parameter of the transferred hyperfine interaction to A{sub tHf}/2{pi}=140 kHz. For the first time on a cyclic iron

  18. A novel ion cooling trap for multi-reflection time-of-flight mass spectrograph

    CERN Document Server

    Ito, Y; Wada, M; Naimi, S; Smorra, C; Sonoda, T; Mita, H; Takamine, A; Okada, K; Ozawa, A; Wollnik, H

    2013-01-01

    A radiofrequency quadrupole ion trap system for use with a multi-reflection time-of-flight mass spectrograph (MRTOF) for short-lived nuclei has been developed. The trap system consists of two different parts, an asymmetric taper trap and a flat trap. The ions are cooled to a sufficient small bunch for precise mass measurement with MRTOF in only 2 ms cooling time in the flat trap, then orthogonally ejected to the MRTOF for mass analysis. A trapping efficiency of ~27% for 23Na+ and ~5.1% for 7Li+ has been achieved.

  19. NMR study of the paramagnetic state of low-dimensional magnets LiCu{sub 2}O{sub 2} and NaCu{sub 2}O{sub 2}

    Energy Technology Data Exchange (ETDEWEB)

    Sadykov, A. F., E-mail: sadykov@imp.uran.ru; Piskunov, Yu. V.; Gerashchenko, A. P.; Ogloblichev, V. V.; Smol’nikov, A. G.; Verkhovskii, S. V.; Arapova, I. Yu.; Volkova, Z. N.; Mikhalev, K. N. [Russian Academy of Sciences, Mikheev Institute of Metal Physics, Ural Branch (Russian Federation); Bush, A. A. [Moscow State Technical University of Radio Engineering, Electronics, and Automation (Russian Federation)

    2017-02-15

    A comprehensive NMR study of the magnetic properties of single crystal LiCu{sub 2}O{sub 2} (LCO) and NaCu{sub 2}O{sub 2} (NCO) is carried out in the paramagnetic region of the compounds for various orientations of single crystals in an external magnetic field. The values of the electric-field gradient (EFG) tensor, as well as the dipole and transferred hyperfine magnetic fields for {sup 63,65}Cu, {sup 7}Li, and {sup 23}Na nuclei are determined. The results are compared with the data obtained in previous NMR studies of the magnetically ordered state of LCO/NCO cuprates.

  20. Search for WIMPs dark matter by means of thin NaI(Tl) scintillator

    Science.gov (United States)

    Fushimi, Ken-Ichi

    2009-10-01

    The segmented detector system made of inorganic crystal is applied to serach for WIMPs dark matter. The NaI(Tl) crystal has great advantages to search for WIMPs dark matter;. *100% of natural abundance of odd A nuclei (^23Na and ^127I). *^127I has a low energy excited state at 57.6keV which is excited by spin-dependent interaction. The prototype detector of thin NaI(Tl) was tested. The energy resolution and the low energy threshold will be reported. The future prospect of WIMPs dark matter search by various detector will be discussed.

  1. Functional magnetic resonance imaging for evaluation of radiation-induced renal damage; Funktionelle MRT der Niere zur Erfassung strahleninduzierter Nierenschaedigungen

    Energy Technology Data Exchange (ETDEWEB)

    Haneder, S.; Schoenberg, S.O.; Michaely, H.J. [Universitaetsmedizin Mannheim, Medizinische Fakultaet Mannheim der Universitaet Heidelberg, Institut fuer Klinische Radiologie und Nuklearmedizin, Mannheim (Germany); Boda-Heggemann, J. [Universitaetsmedizin Mannheim, Medizinische Fakultaet Mannheim der Universitaet Heidelberg, Klinik fuer Strahlentherapie und Radioonkologie, Mannheim (Germany)

    2012-03-15

    The diagnosis of radiation-induced (especially chronic) renal alterations/damage is difficult and currently relies primarily on clinical evaluation. The importance of renal diagnostic evaluation will increase continuously due to the increasing number of long-term survivors after radiotherapy. This article evaluates the potentia diagnostic contribution of magnetic resonance (MR) imaging with a focus on functional MRI. The following functional MRI approaches are briefly presented and evaluated: blood oxygenation level-dependent imaging (BOLD), diffusion-weighted imaging (DWI) or diffusion tensor imaging (DTI), MR perfusion measurements and {sup 23}Na imaging. In summary, only DWI and contrast-enhanced MR perfusion currently seem to be suitable approaches for a broader, clinical implementation. However, up to now valid data from larger patient studies are lacking for both techniques in regard to radiation-induced renal alterations. The BOLD and {sup 23}Na imaging procedures have a huge potential but are currently neither sufficiently evaluated with regard to radiation-induced renal alterations nor technically simple and reliable for implementation into the clinical routine. (orig.) [German] Die Diagnostik strahleninduzierter, insbesondere chronischer Schaedigungen der Niere ist nach wie vor schwierig und beruht primaer auf der klinischen Beurteilung. Durch die zunehmende Anzahl von Langzeitueberlebenden nach einer Strahlentherapie wird die Bedeutung dieser Diagnostik jedoch weiter zunehmen. In diesem Beitrag wird der Frage nachgegangen, in wieweit hierzu die MRT-Bildgebung und hier besonders die funktionellen Bildgebungsmodalitaeten ihren Beitrag leisten koennen. Die folgenden Verfahren werden kurz vorgestellt und bewertet: die Blood-oxygenation-level-dependent-Bildgebung (BOLD), die diffusionsgewichtete Bildgebung (''diffusion-weighted imaging'', DWI) bzw. das ''diffusion tensor imaging'' (DTI), die MR-Perfusionsmessungen, und

  2. Evaluation of cross-sections for particle induced gamma-ray emission (PIGE) spectroscopy

    Science.gov (United States)

    Gurbich, A. F.

    2014-07-01

    The extension of the cross-section evaluation procedure to PIGE data was investigated and the first results are reported. Two different cases were studied: the gamma emission accompanying inelastic scattering of protons, and the (p,γ)-reaction. The corresponding theoretical calculations were performed in the framework of R-matrix and DWBA for the (p,p‧γ) reaction on 23Na, and using statistical model for the proton radiative capture by 52Cr. The possibility of achieving a close fit to the experimental data is demonstrated.

  3. Evaluation of cross-sections for particle induced gamma-ray emission (PIGE) spectroscopy

    Energy Technology Data Exchange (ETDEWEB)

    Gurbich, A.F., E-mail: gurbich@ippe.ru

    2014-07-15

    The extension of the cross-section evaluation procedure to PIGE data was investigated and the first results are reported. Two different cases were studied: the gamma emission accompanying inelastic scattering of protons, and the (p,γ)-reaction. The corresponding theoretical calculations were performed in the framework of R-matrix and DWBA for the (p,p′γ) reaction on {sup 23}Na, and using statistical model for the proton radiative capture by {sup 52}Cr. The possibility of achieving a close fit to the experimental data is demonstrated.

  4. Forbidden transitions in a magneto-optical trap.

    Science.gov (United States)

    Bhattacharya, M; Haimberger, C; Bigelow, N P

    2003-11-21

    We report the first observation of a nondipole transition in an ultracold atomic vapor. We excite the 3P-4P electric quadrupole (E2) transition in 23Na confined in a magneto-optical trap, and we demonstrate its application to high-resolution spectroscopy by making the first measurement of the hyperfine structure of the 4P(1/2) level and extracting the magnetic dipole constant A=30.6+/-0.1 MHz. We use cw optical-optical double resonance accompanied by photoionization to probe the transition.

  5. Sodium magnetic resonance imaging. Development of a 3D radial acquisition technique with optimized k-space sampling density and high SNR-efficiency; Natrium-Magnetresonanztomographie. Entwicklung einer 3D radialen Messtechnik mit optimierter k-Raum-Abtastdichte und hoher SNR-Effizienz

    Energy Technology Data Exchange (ETDEWEB)

    Nagel, Armin Michael

    2009-04-01

    A 3D radial k-space acquisition technique with homogenous distribution of the sampling density (DA-3D-RAD) is presented. This technique enables short echo times (TE<0.5 ms), that are necessary for {sup 23}Na-MRI, and provides a high SNR-efficiency. The gradients of the DA-3D-RAD-sequence are designed such that the average sampling density in each spherical shell of k-space is constant. The DA-3D-RAD-sequence provides 34% more SNR than a conventional 3D radial sequence (3D-RAD) if T{sub 2}{sup *}-decay is neglected. This SNR-gain is enhanced if T{sub 2}{sup *}-decay is present, so a 1.5 to 1.8 fold higher SNR is measured in brain tissue with the DA-3D-RAD-sequence. Simulations and experimental measurements show that the DA-3D-RAD sequence yields a better resolution in the presence of T{sub 2}{sup *}-decay and less image artefacts when B{sub 0}-inhomogeneities exist. Using the developed sequence, T{sub 1}-, T{sub 2}{sup *}- and Inversion-Recovery-{sup 23}Na-image contrasts were acquired for several organs and {sup 23}Na-relaxation times were measured (brain tissue: T{sub 1}=29.0{+-}0.3 ms; T{sub 2s}{sup *}{approx}4 ms; T{sub 2l}{sup *}{approx}31 ms; cerebrospinal fluid: T{sub 1}=58.1{+-}0.6 ms; T{sub 2}{sup *}=55{+-}3 ms (B{sub 0}=3 T)). T{sub 1}- und T{sub 2}{sup *}-relaxation times of cerebrospinal fluid are independent of the selected magnetic field strength (B0 = 3T/7 T), whereas the relaxation times of brain tissue increase with field strength. Furthermore, {sup 23}Na-signals of oedemata were suppressed in patients and thus signals from different tissue compartments were selectively measured. (orig.)

  6. Speciation of Cu and Zn in soil solution in a long-term fertilization experiment

    Directory of Open Access Journals (Sweden)

    Rutkowska Beata

    2014-03-01

    Full Text Available Celem pracy była ocena zmian stężenia Cu i Zn oraz określenie procentowego udziału poszczególnych form tych pierwiastków w roztworze glebowym. Badania prowadzono w warunkach wieloletniego doświadczenia nawozowego zlokalizowa- nego w Stacji Doświadczalnej Wydziału Rolnictwa i Biologii SGGW w Skierniewicach. Roztwór glebowy pozyskano metodą pod- ciśnieniową. Poszczególne, możliwe do wystąpienia formy miedzi i cynku w roztworze glebowym obliczono przy wykorzystaniu programu komputerowego MINTEQA2. Uzyskane wyniki badań wskazują, że stężenie Cu i Zn w roztworze glebowym zwiększa się pod wpływem wyłącznego nawożenia mineralnego (NPK. W warunkach stosowania obornika (CaNPK+FYM zmniejsza się stęże- nie miedzi, a zwiększa stężenie cynku w roztworze glebowy m w stosunku do obiektów' o wyłącznym naw ożeniu mineralnym (NPK, CaNPK. Wapnowanie było czynnikiem wpływającym na zmniejszenie stężenia obydw u badanych pierwiastków w roztworze glebo- wym. Wyniki analizy numerycznej roztw oru glebowego wykazały, że niezależnie od nawożenia dominującą formą miedzi w roztwo- rze glebowym były kompleksy metalo-organiczne. Ich udział w całkow itym stężeniu Cu w roztworze glebowym stanow ił od 76,5 do 85,2%. Pod względem malejącego udziału w roztworze glebowy m poszczególne formy miedzi można uszeregować następująco: kompleksy miedzi z materią organiczną >wolne jony Cu2+ >kompleksy miedzi z węglanami. Natomiast główną formą cynku w roztworze glebowym były wolne jony Zn2+, których udział w ogólnym stężeniu cynku w roztworze glebowym wynosił od 76,9 do 86,4%. Szereg malejącego udziału poszczególnych form cynku w roztworze glebowym przedstawia się następująco: wolne jony Zn2+ >kompleksy Zn z materią organiczną>kompleksy cynku z chlorkami >kompleksy z węglanami.

  7. Surgical techniques in the radical resection of hilar cholangiocarcinoma%肝门部胆管癌根治性切除手术技巧

    Institute of Scientific and Technical Information of China (English)

    彭淑牖; 钱浩然

    2010-01-01

    @@ 肝门部胆管癌是具有挑战性的疑难病症,其根治性切除一直是外科医生不断追求的目标之一.围手术期治疗策略的优化,影像学技术的提高,特别是手术器械的改进为肝门部胆管癌治疗的发展起到了重要的推动作用[1].肝门部胆管癌手术策略的制定以及规范化操作是获得满意远期疗效的基础.%Hilar cholangiocarcinoma remains a formi-dable challenge to hepatopancreatobiliary surgeons since the reported resection of a primary cancer originating at the hepatic duct confluence by Brown and Myers in 1954. Emerging evidence has indicated that aggressive surgery with a curative resection offers a better option for long-term survival compared with conservative therapy. Liver transplantation has also been considered as a management opportunity for the treatment of cholangiocarcinoma. However, the survival rate has been poor due to the high proportion of disease recurrence. This review highlights recent techniques in hilar cholangiocarcinoma resec-tion, with special attention to the management of the resection margin, clinical skills of liver resection, lymph node clearance, and portal vein or hepatic artery resection or reconstruction. In addition, technical advances have been proposed in hepatopan-creatoduodenectomy and liver transplantation for hilar cholangio-carcinoma treatment. In the current hepatic procedures, promis-ing survival outcomes have been obtained in patients with hilar cholangiocarcinoma, exhibiting a decreased operative mortality and a steady improvement in long-term survival. Overall, the correct clinical strategy and appropriate surgical techniques may provide an increased chance to cure patients with hilar cholan-giocarcinoma.

  8. 高精度宽频带逆变器全数字化控制技术%Digital Control Technology for High-pecision and Wide-band Inverter

    Institute of Scientific and Technical Information of China (English)

    毛惠丰; 陈增禄; 杨旭; 王兆安

    2011-01-01

    针对高精度逆变器的特殊性能要求,提出了基于FPGA的全数字化控制方案.该方案既具有数字电路稳定可靠的一般特点,又具有数字控制系统可重复编程、响应快以及可并行运算等特点.给出了直流母线电压补偿和直流漂移的调偏控制原理,设计出基于FPGA的数字控制系统中反比例系数前置放大器、调偏控制以及SPWM多重化信号生成的一套全数字化实现方案.最后在一台单相8重化9电平电压型逆变器的实验平台上进行实验验证,其结果证明了该控制方案的有效性.%Owing to the special requirement for high-precision and wide-band inverter,a novel control scheme is presented based on field programmable gate array(FPGA).The scheme is steady and trusty as digital circuit,programmable, and rapid in response and parellel for operation,etc.The theory for compensation of DC generatrix voltage and offset control of DC drift current for AC output is introduced.The realization scheme of digital control system, including to inverse proportion coefficient front amplifier,and offset control and multiple SPWM wave form,is introduced based on FPGA.Finally ,the experimental results are analyzed in a signal-phase voltage source inverter operating in eight multiple and nine level, which confirm the value of the algorithm.

  9. Three dimension quantitative structure toxicity relationship study of cytoxicitic phenolic analogues against Tetrahymena pyriformis%梨形四膜虫细胞毒性苯酚类似物的三维定量结构毒性相关研究

    Institute of Scientific and Technical Information of China (English)

    王远强; 刘跃辉; 丁元; 张娅; 林治华

    2012-01-01

    目的 使用比较分子相似性指数分析(CoMSIA)方法 对梨形四膜虫细胞毒性苯酚类似物进行三维定量结构毒性相关(3D-QSTR)研究.方法 系统分析了立体场、静电场、疏水场对三维结构毒性模型的影响,并建立相应的3D-QSTR预测模型.结果 使用静电场与疏水场协同作用建立了具有良好可靠性和预测能力的3D-QSTR模型(Q2=0.767,r2=0.933).结论 模型具有良好的预测能力,对苯酚类似物的结构修饰具有指导作用.%Objective To use the comparative molecular similarity indices analysis (CoMSIA) for constructing three dimension quantitative structure-toxicity relationship (3D-QSTR) models of phenolic analogues with cytotoxicity against Tetrahymena pyri-formis. Methods The contribution of hydrophobic,electrostatic and steric property to 3D-QSTR models were analyzed comprehensively. The optimized 3D-QSTR model was constructed by CoMSIA using electrostatic and hydrophobic properties for phenolic ana-loguesResults The model had good stability (Q2 =0. 767) and predictive ability (r2 =0. 933). Conclusion The electrostatic and hydrophobic counter maps from CoMSIA could guide the structural modification of phenolic analogues directly.

  10. Effect of Lectins from Diocleinae Subtribe against Oral Streptococci

    Directory of Open Access Journals (Sweden)

    Edson Holanda Teixeira

    2011-04-01

    Full Text Available Surface colonization is an essential step in biofilm development. The ability of oral pathogens to adhere to tooth surfaces is directly linked with the presence of specific molecules at the bacterial surface that can interact with enamel acquired pellicle ligands. In light of this, the aim of this study was to verify inhibitory and antibiofilm action of lectins from the Diocleinaesubtribe against Streptococcus mutans and Streptococcus oralis. The inhibitory action against planctonic cells was assessed using lectins from Canavaliaensi formis (ConA, Canavalia brasiliensis (ConBr, Canavalia maritima (ConM, Canavalia gladiata (CGL and Canavalia boliviana (ConBol. ConBol, ConBr and ConM showed inhibitory activity on S. mutans growth. All lectins, except ConA, stimulated significantly the growth of S. oralis. To evaluate the effect on biofilm formation, clarified saliva was added to 96-well, flat-bottomed polystyrene plates, followed by the addition of solutions containing 100 or 200 µg/mL of the selected lectins. ConBol, ConM and ConA inhibited the S. mutans biofilms. No effects were found on S. oralis biofilms. Structure/function analysis were carried out using bioinformatics tools. The aperture and deepness of the CRD (Carbohydrate Recognition Domain permit us to distinguish the two groups of Canavalia lectins in accordance to their actions against S. mutans and S. oralis. The results found provide a basis for encouraging the use of plant lectins as biotechnological tools in ecological control and prevention of caries disease.

  11. PERFORMANS NA TRYBUNACH. O KULTUROWO-DRAMATURGICZNYM ASPEKCIE KIBICOWANIA

    Directory of Open Access Journals (Sweden)

    Radosław Kossakowski

    2015-02-01

    Full Text Available Głównym celem poniższego tekstu jest pokazanie, że w pewnym wymiarze działalność i aktywność kibiców noszą znamiona performansu. Uwagę skupiono na „hardcorowych” kibicach piłkarskich (odłam „ultras”, odpowiedzialni za meczowe choreografie w Polsce. Performanse kibicowskie nie są tylko przedstawieniami estetycznymi, ale stanowią także zróżnicowane pod względem formy reprezentacje treści kulturowych. Prezen-towanie umiejętności czysto technicznych (przygotowanie opraw meczowych itp. przenika się z kulturowym „tłem”. W przypadku kibiców konstytuują je przede wszystkim opozycje, antypatie, chronologie i analogie. Bardzo ważną rolę w przedstawieniach kibicowskich odgrywa szeroko rozumiana tradycja (historia klubu, ale i historia regionu czy Polski. Analiza performansów umieszczona jest w szerszym kontekście przemian współczesnej piłki nożnej, jej komercjalizacji. „Tradycyjni” fani ustępują nowej grupie kibiców-konsumentów, a dla tych pierwszych kreowanie publicznych pokazów staje się jednym z ostatnich bastionów prezentowania treści własnej kultury i grupowej tożsamości.

  12. A brief history of traditional Chinese medicinal pills%传统中药丸剂史述略

    Institute of Scientific and Technical Information of China (English)

    许霞; 陆翔; 朱建平

    2016-01-01

    传统中药丸剂,系指药材细粉或药材提取物加适宜黏合剂或其他辅料制成的球形或类球形剂型。中药丸剂是一种古老的传统剂型,它自先秦起源后,经汉代至明清,历代不断发展和丰富,适应疾病治疗的需要,制作工艺逐步完善,相继出现了蜜丸、蜡丸、包衣丸以及蜡壳丸等多种形式。近现代随着制药机械的进步,中药丸剂不断创新,现已成为批量生产的中成药的主要剂型。%Traditional Chinese medicine pill, an archaic medicinal preparation form,is a kind of spherical or spherical-like preparation form produced by medicinal powders or extracts mixed with appropri-ate excipient or other accessories. It was originated in the Pre-Qin Dynasty, developed and enriched from the Han Dynasty to the Ming and Qing Dynasties. With the improvement of preparing process, honeyed pill, waxed pill, coating pill and wax-coating pill etc. appeared in succession. In modern times, with the pro-gress of pharmaceutical machine, the medicinal pill is innovated constantly, and at present, it becomes the main form of Chinese patent medicine with batch production.

  13. Moisture monitoring in waste disposal surface barriers.

    Science.gov (United States)

    Brandelik, Alex; Huebner, Christof

    2003-05-01

    Surface barriers for waste disposal sites should prevent waste water and gas emission into the environment. It is necessary to assess their proper operation by monitoring the water regime of the containment. A set of three new water content measuring devices has been developed that provide an economical solution for monitoring the moisture distribution and water dynamic. They will give an early warning service if the barrier system is at risk of being damaged. The cryo soil moisture sensor 'LUMBRICUS' is an in situ self-calibrating absolute water content measuring device. It measures moisture profiles at spot locations down to 2.5 m depth with an accuracy of better than 1.5% and a depth resolution of 0.03 m. The sensor inherently measures density changes and initial cracks of shrinking materials like clay minerals. The large area soil moisture sensor 'TAUPE' is a moisture sensitive electric cable network to be buried in the mineral barrier material of the cover. A report will be given with results and experiences on an exemplary installation at the Waste Disposal Facility Karlsruhe-West. 800 m2 of the barrier construction have been continuously monitored since December 1997. Volumetric water content differences of 1.5% have been detected and localised within 4 m. This device is already installed in two other waste disposal sites. A modified 'TAUPE' was constructed for the control of tunnels and river dams as well. Thin sheet moisture sensor 'FORMI' is specifically designed for moisture measurements in liners like bentonite, textile and plastic. Due to its flexibility it follows the curvature of the liner. The sensor measures independently from neighbouring materials and can be matched to a wide range of different thickness of the material. The sensors are patented in several countries.

  14. Metodologija postavljanja diferencijalnih jednačina pri istraživanju dinamičkih parametara konstrukcije lansirne rampe na vozilu točkašu / Methodology make of differential equations at investigation of dynamic parameters of constructions of launcher on vehicle

    Directory of Open Access Journals (Sweden)

    Vlado P. Đurković

    2007-07-01

    Full Text Available U radu se određuju optimalni parametri konstrukcije lansirne rampe: položaj tačke vešanja hidrocilindra na rampi, dužina i materijal rampe, koeficijent viskoznog trenja ulja u hidrocilindru, koeficijent krutosti lansirne rampe i hidrocilindra, poprečni presek rampe, itd. Radi toga postavlja se mehanički model sa tri stepena slobode kretanja i odgovarajući model u vidu sistema od tri nelinearne diferencijalne jednačine drugog reda. Numeričkom analizom dobijenog matematičkog modela (primenom programskog jezika Compaq Visual Fortran, Version 6.5 dolazi se do optimalnosti pojedinih parametara. Dobijeni rezultati, predstavljeni u grafičkoj formi, mogu da budu veoma korisni projektantima raketnih lansera, kako stabilnih, tako i mobilnih, pri razvoju novih konstrukcija i modifikaciji postojećih. / This paper determines optimal construction parametrics of a missile launcher place of hydro-cylinder on launcher, length and material of ramp of launcher coefficient of the viscosity of friction oil in hydro-cylinder, coefficient of stiffness of launcher and hydro-cylinder, cross-section of launcher etc. In this purpose appointment mechanical model with three degrees of freedom motion and analogous model of system of three nonlinear differential equation second order. Numerical analysis obtained mathematical model (programming with language Compaq Visual Fortran, Version 6.5 coming to optimal parameters. Obtained results that are presented in graphical shapes can be very useful for designing stable and mobile missile launchers, both for development of new constructions and modification of existing structures.

  15. 酶法进行海洋低值蛋白资源高值化利用初探%PRELIMINARY STUDY ON VALUE-INCREMENT OF LOW VALUED MARINE PROTEIN BY ENZYMATIC HYDROLYSIS

    Institute of Scientific and Technical Information of China (English)

    师晓栋; 何海伦; 王运涛; 张玉忠; 高培基

    2001-01-01

    首先分析了?鱼与四角蛤两种低值海洋蛋白资源的营养成分,然后利用两株高产蛋白酶菌株通过液体发酵制备的蛋白酶制剂对两种蛋白资源进行了酶解,经过比较酶解率和肽含量,表明对于四角蛤,菌株SM98013产生的碱性蛋白酶和SM98011产生的中性蛋白酶都可高效酶解;而对于?鱼,菌株SM98013产生的碱性蛋白酶的酶解效率较高。文中对海洋低值蛋白资源的高值化利用的途径进行了讨论。%The contents of the nutritional component in the two kinds of low-value marine proteins were analyzed and hydrolyzed by the neutral and alkaline proteases produced by liquid fermentation with the strains of Bacillus subtilis SM98011 and B. subtilis SM98013, respectively. It was showed that the Mactra veneri formis Deshayes could be effectively hydrolyzed by both neutral and alkaline proteases, otherwise, the Engranlis japonicus was hydrolyzed more effectively by alkaline protease from B. subtilis SM98013 than neutral protease from B. subtilis SM98013. The application possibility of this high-valued marine protein was also discussed.

  16. On Translation of English Film Titles%英文电影片名翻译

    Institute of Scientific and Technical Information of China (English)

    张欢

    2012-01-01

    电影这种艺术形式非常容易被各种文化层次的观众所接受。观众对于电影的第一印象来自片名,电影片名隐含着独特的本国文化。优秀电影片名译作是对文化与信息传递和实现商业价值的前提条件之一。本文通过分析英文电影片名翻译的方法和技巧,指出在翻译的过程中,可以根据具体情况,采用直译、意译、音译这三种翻译方法。%Movie,as an art form,is easily accepted by audiences of various cultural levels.The audience gets the first impression of a film from its title which involves much of their native culture.Good translations of the film titles can not only attract more audience to realize its commercial value,but also be one of prerequisites that make sure the culture and information pass on.The paper mainly discussed the translation of English movie titles,with the consideration of culture,recognizes the distinctions of cultures and languages between English and Chinese.The author draws a conclusion that,in the process of translation,according to the specific circumstances,there are three methods of translation of English film titles,which are literal translation,free translation and transliteration.

  17. Contents of selected macroelements in soils, potatoes and fodder beets at variable soil reaction / Zawartość wybranych makroelementów w glebach oraz w ziemniakach i burakach pastewnych przy zmiennym odczynie gleby

    Directory of Open Access Journals (Sweden)

    Rogóż Antoni

    2015-03-01

    Full Text Available Celem przeprowadzonych badañ było określenie koncentracji wybranych makroelementów w glebie i w roślinach okopowych (ziemniakach i burakach pastewnych przy zmiennym odczynie gleby. Zmiany wartości pH w badanych glebach decydowały o zawartości tych pierwiastków w formach rozpuszczalnych oznaczanych w HCl o stężeniu 0,1 mol·dm-3. Analiza statystyczna wykazała dodatnią zależność pomiędzy wartością pH gleb a zawartością wapnia i magnezu w formie zbliżonej do ogólnej oraz zawartością rozpuszczalnych form fosforu, wapnia i magnezu. Zawartość badanych makroelementów, tj. fosforu, wapnia, magnezu w uprawianych burakach pastewnych oraz ziemniakach zależała od zasobności i form, w jakiej badane pierwiastki występują w glebie, a także od gatunku oraz analizowanej części rośliny. Wraz ze wzrostem wartości pH gleb stwierdzano zwiększenie zawartości fosforu i zmniejszenie zawartości magnezu w korzeniach i częściach nadziemnych buraków. Zawartość wapnia w korzeniach uległa zwiększeniu wraz ze wzrostem wartości pH gleb, natomiast kierunek zmian zawartości tego pierwiastka w ogonkach i blaszkach liściowych buraków nie był jednoznaczny. W bulwach ziemniaków stwierdzono nieznaczne obniżenie się zawartości badanych pierwiastków wraz ze wzrostem wartości pH gleb.

  18. The Colourful Space of Pure Form. The Problem of Colour in Theory and Practice in the Work of Stanisław Ignacy Witkiewicz

    Directory of Open Access Journals (Sweden)

    Anna Żakiewicz

    2010-01-01

    Full Text Available Colour was a very important problem in the whole work of Stanisław Ignacy Witkiewicz. Not only a whole chapter of his basic theoretical work Nowe formy w malarstwie (New Forms in Painting, published 1919 was devoted to that but the artist also examined his theory in practice executing many paintings presenting his ideas (e.g. Self-portrait, 1913, Portrait of Feliks Lewiński, 1917, Portrait of Maria Witkiewiczowa, 1918 and many others. A base for that was a harmony of complementary colours: green and red, blue and orange, violet and yellow. Many theorists before Witkacy were interested in that: Wolfgang Goethe, Philip Otto Runge, Wassili Kandinsky. The artist didn’t mention them in his deliberations but a psychologist, Hermann Ebinghaus (Grundzüge der Psychologie, 1897 and other artists only: Paul Gauguin and Pablo Picasso. Witkacy even copied one of Gauguin’s paintings, Te Arii Vahine and described it in his writings as the best example of Pure Form. Witkacy enthusiastically described Picasso’s paintings in his first novel 622 upadki Bunga (622 Downfalls of Bungo, written ca. 1910, first published 1972 and mentioned many times in his theoretical works. The artist appreciated also Georges Seurat’s paintings and his thoughts on colours. Witkacy himself created a detailed systempresenting the best colour schemes and described many compositions corresponding to that. In 1938 the artist wrote an article O istocie malarstwa (On the Essence of Painting, which was an opposition to his earlier thoughts. In the end of his life the artist decided that the most important was imagination instead of theoretical rules.

  19. Production of Dialect Thematic Maps base on ArcGIS and CorelDraw--A case study in Pinghua Dialect Thematic Maps of Guangxi%基于ArcGIS-CorelDraw的方言地图集制作与研究--以广西平话方言地图集为例

    Institute of Scientific and Technical Information of China (English)

    周冬梅; 童新华; 李连进

    2015-01-01

    The geographical distribution of dialect and dialect features with label distribution map form,is an important research topic in Linguistics and geography disciplines concerned.Based on ArcGIS technology and CoreDraw software, the process and key issues of dialect thematic map production were studied in this paper. The spatial distribution features and spatial relationships of different dialects were performed, by adopting the expression function of spatial information of ArcGIS. Meanwhile, the aesthetic property of dialect thematic map was enhanced, by applying the powerful editing landscaping features of CorelDraw. The results show that, to make dialect thematic maps, the combination of ArcGIS and CorelDraw can improve the efficiency of cartography and catrtographic quality, enhance information presentation and readability of the dialect map, and better satisfy the requirements of making dialect thematic maps.%用地图的形式标示方言分布和方言特征的地理空间分布情况,是语言学和地理学学科关注的重要研究课题。文章综合运用ArcGIS的空间信息制图表达功能和CorelDraw的编辑美化功能,突出表达方言特征的空间分布情况和空间关系,增强方言地图的美观性。研究结果表明,结合ArcGIS软件和CorelDraw软件对方言专题图进行编制,有利于提高制图效率和制图质量,增强方言地图的信息表达和可读性,更好地满足方言专题图制作的要求。

  20. The concentration of heavy metals in soils around the wetlands of the Ina valley near Sławęcin / Koncentracja metali ciężkich w glebach mokradeł doliny Iny koło Sławęcina

    Directory of Open Access Journals (Sweden)

    Paprota Dariusz

    2015-12-01

    Full Text Available Mokradła w górnym odcinku doliny Iny to obszar cenny przyrodniczo i jednocześnie wolny od negatywnego oddziaływania przemysłu. Za ewentualne źródło zanieczyszczeń można przyjąć tu między innymi zanieczyszczenia z pól i łąk w postaci środków ochrony roślin oraz nawozów sztucznych, czy też zrzuty ścieków komunalnych z zabudowań wiejskich jak i niewielkiego miasta Recz. Badaniami objęto gleby mokradeł lewobrzeżnej części doliny Iny w pobliżu Sławęcina. Wykonano cztery charakterystyczne profile glebowe, z których pobrano materiał glebowy do badań laboratoryjnych. W próbkach glebowych oznaczono: zawartość materii organicznej, odczyn w 1 mol KCl·dm-3, w poziomach mineralnych skład granulometryczny oraz koncentrację metali ciężkich w formie wymiennej i ogólnej (Cd, Pb, Cu, Co, Zn, Fe. W wyniku przeprowadzonych badań stwierdzono, że gleby mokradeł doliny Iny koło Sławęcina nie wykazują zanieczyszczenia metalami ciężkimi, przy czym obserwuje się ich większe nagromadzenie w poziomach powierzchniowych murszowych, niż w niżej występującym torfie niskim i niżej występujących osadach.

  1. Comparative modeling and molecular dynamics suggest high carboxylase activity of the Cyanobium sp. CACIAM14 RbcL protein.

    Science.gov (United States)

    Siqueira, Andrei Santos; Lima, Alex Ranieri Jerônimo; Dall'Agnol, Leonardo Teixeira; de Azevedo, Juliana Simão Nina; da Silva Gonçalves Vianez, João Lídio; Gonçalves, Evonnildo Costa

    2016-03-01

    Rubisco catalyzes the first step reaction in the carbon fixation pathway, bonding atmospheric CO2/O2 to ribulose 1,5-bisphosphate; it is therefore considered one of the most important enzymes in the biosphere. Genetic modifications to increase the carboxylase activity of rubisco are a subject of great interest to agronomy and biotechnology, since this could increase the productivity of biomass in plants, algae and cyanobacteria and give better yields in crops and biofuel production. Thus, the aim of this study was to characterize in silico the catalytic domain of the rubisco large subunit (rbcL gene) of Cyanobium sp. CACIAM14, and identify target sites to improve enzyme affinity for ribulose 1,5-bisphosphate. A three-dimensional model was built using MODELLER 9.14, molecular dynamics was used to generate a 100 ns trajectory by AMBER12, and the binding free energy was calculated using MM-PBSA, MM-GBSA and SIE methods with alanine scanning. The model obtained showed characteristics of form-I rubisco, with 15 beta sheets and 19 alpha helices, and maintained the highly conserved catalytic site encompassing residues Lys175, Lys177, Lys201, Asp203, and Glu204. The binding free energy of the enzyme-substrate complexation of Cyanobium sp. CACIAM14 showed values around -10 kcal mol(-1) using the SIE method. The most important residues for the interaction with ribulose 1,5-bisphosphate were Arg295 followed by Lys334. The generated model was successfully validated, remaining stable during the whole simulation, and demonstrated characteristics of enzymes with high carboxylase activity. The binding analysis revealed candidates for directed mutagenesis sites to improve rubisco's affinity.

  2. Influence of Nutrient-release of Mix-leaf Litter Decay of Populus simonii with Other Trees in the Loess Plateau%黄土高原小叶杨与其他树种枯落叶混合分解对养分释放的影响

    Institute of Scientific and Technical Information of China (English)

    祝振华; 刘增文; 袁娜; 杜良贞

    2012-01-01

    Soil polarization resulted from continuous growth and planting of pure forest stands is main cause of soil degradation and unbalanced or unsustainable development of artificial forest ecosystem. Fundamental way of controlling soil polarization is to select friendly tree species to form mixed forests. Indoor mixed decomposition experiment was conducted to study the effect of decomposition of mixed leaves of Populus simonii and other species on nutrient release, and to provide theoretical basis for artificial mixed forest formation. The results were as follows. (1). Quercus liaotungensis leaf litter strongly promoted organic carbon release with a promotion percentage of 21. 32%, while Pinus tabulae formi demonstrated suppression effect, and the release rate decreased by 14. 78%. No significant effects on the organic carbon release were observed among the leaves of other tree species. (2) Q. liaotungensis leaf litter strongly increased nitrogen release with a promotion rate of 28. 69%, showing significant promotion effect, for P. sylvestris var. mongolice and Robinia pseudoacacia leaf litters, however, the promotion effects were relatively weaker and nitrogen release rate increased by 14. 98% and 13. 36% respectively. P. Tabulaeformis leaf litter ex-hibited strong inhabiting effect on nitrogen release, the release rate decreased by 20. 33%. For the leaves of other tree species, no significant effects on nitrogen release were observed. (3) R. pseudoacacia, Q. li-aotungensis, and Hippophae rhamnoides leaf litters very strongly promoted the phosphorus release rate with promotion percentages of 57. 60% , 43. 06% , and 38. 60% respectively. Amorpha fruticosa leaf litter strongly promoted phosphorus release, the promotion rate increased by 22. 64%. P. tabulae formis and P. sylvestris var. mongolica leaf litters significantly inhabited phosphorus release, the release rate reduced by 62. 63% and 47. 99%, respectively. The leaf litters of other tree species showed no

  3. Structure and short time degradation studies of sodium zirconium phosphate ceramics loaded with simulated fast breeder (FBR) waste

    Science.gov (United States)

    Ananthanarayanan, A.; Ambashta, R. D.; Sudarsan, V.; Ajithkumar, T.; Sen, D.; Mazumder, S.; Wattal, P. K.

    2017-04-01

    Sodium zirconium phosphate (NZP) ceramics have been prepared using conventional sintering and hot isostatic pressing (HIP) routes. The structure of NZP ceramics, prepared using the HIP route, has been compared with conventionally sintered NZP using a combination of X-ray diffraction (XRD) and (31P and 23Na) nuclear magnetic resonance (NMR) spectroscopy techniques. It is observed that NZP with no waste loading is aggressive toward the steel HIP-can during hot isostatic compaction and significant fraction of cations from the steel enter the ceramic material. Waste loaded NZP samples (10 wt% simulated FBR waste) show significantly low can-interaction and primary NZP phase is evident in this material. Upon exposure of can-interacted and waste loaded NZP to boiling water and steam, 31P NMR does not detect any major modifications in the network structure. However, the 23Na NMR spectra indicate migration of Na+ ions from the surface and possible re-crystallization. This is corroborated by Small-Angle Neutron Scattering (SANS) data and Scanning Electron Microscopy (SEM) measurements carried out on these samples.

  4. One-Pot Synthesis, X-Ray Diffraction and MAS NMR Spectroscopic Study of Gallosilicate Nitrate Cancrinite Na8[GaSiO4]6(NO34(H2O6

    Directory of Open Access Journals (Sweden)

    Ashok V. Borhade

    2010-01-01

    Full Text Available One-pot synthetic gallosilicate nitrate cancrinite (CAN framework topology have been synthesized under hydrothermal conditions at 100 °C. The synthesized product was characterized by, X-ray powder diffraction, IR, Raman and 29Si, 23Na MAS NMR spectroscopy, SEM and thermogravimetry. The crystal structure refinement of pure nitrate cancrinite has been carried out from X-ray data using Rietveld refinement method. Gallosilicate cancrinite Na8[GaSiO4]6(NO34(H2O6 crystalline hexagonal with space group P63 and a = 12.77981 Å (2, c = 5.20217 Å (1, (Rwp = 0.0696 Rp = 0.0527. The results by MAS NMR spectroscopy confirmed the alternating Si, Ga ordering of the gallosilicate framework for a Si/Ga ratio of 1.0. A distribution of the quadrupolar interaction of the sodium cations caused by the enclatherated water molecules and motional effects can be suggested from the 23Na MAS NMR. Thermogravimetric investigation shows the extent of nitrate entrapment, stability within the cancrinite cage and decomposition properties. SEM clearly shows the hexagonal needle shaped crystals of nitrate cancrinite.

  5. The structure and binding mode of citrate in the stabilization of gold nanoparticles

    KAUST Repository

    Al-Johani, Hind

    2017-03-27

    Elucidating the binding mode of carboxylate-containing ligands to gold nanoparticles (AuNPs) is crucial to understand their stabilizing role. A detailed picture of the three-dimensional structure and coordination modes of citrate, acetate, succinate and glutarate to AuNPs is obtained by 13C and 23Na solid-state NMR in combination with computational modelling and electron microscopy. The binding between the carboxylates and the AuNP surface is found to occur in three different modes. These three modes are simultaneously present at low citrate to gold ratios, while a monocarboxylate monodentate (1κO1) mode is favoured at high citrate:gold ratios. The surface AuNP atoms are found to be predominantly in the zero oxidation state after citrate coordination, although trace amounts of Auδ+ are observed. 23Na NMR experiments show that Na+ ions are present near the gold surface, indicating that carboxylate binding occurs as a 2e− L-type interaction for each oxygen atom involved. This approach has broad potential to probe the binding of a variety of ligands to metal nanoparticles.

  6. Structural Characterization of Polymer-Clay Nanocomposites Prepared by Co-Precipitation Using EPR Techniques

    Directory of Open Access Journals (Sweden)

    Udo Kielmann

    2014-02-01

    Full Text Available Polymer-clay nanocomposites (PCNCs containing either a rubber or an acrylate polymer were prepared by drying or co-precipitating polymer latex and nanolayered clay (synthetic and natural suspensions. The interface between the polymer and the clay nanoparticles was studied by electron paramagnetic resonance (EPR techniques by selectively addressing spin probes either to the surfactant layer (labeled stearic acid or the clay surface (labeled catamine. Continuous-wave (CW EPR studies of the surfactant dynamics allow to define a transition temperature T* which was tentatively assigned to the order-disorder transition of the surfactant layer. CW EPR studies of PCNC showed that completely exfoliated nanoparticles coexist with agglomerates. HYSCORE spectroscopy in PCNCs showed couplings within the probe −assigned with DFT computations− and couplings with nuclei of the environment, 1H and 23Na for the surfactant layer probe, and 29Si, 7Li, 19F and 23Na for the clay surface probe. Analysis of these couplings indicates that the integrity of the surfactant layer is conserved and that there are sizeable ionic regions containing sodium ions directly beyond the surfactant layer. Simulations of the very weak couplings demonstrated that the HYSCORE spectra are sensitive to the composition of the clay and whether or not clay platelets stack.

  7. Increased cortical and deep grey matter sodium concentration is associated with physical and cognitive disability in relapse-onset multiple sclerosis

    DEFF Research Database (Denmark)

    Brownlee, WJ; Alves Da Mota, Patricia; Prados, Ferran

    in relapse-onset MS. Methods: 70 MS patients (57 relapsing-remitting MS [RRMS] and 13 secondary progressive MS [SPMS], mean disease duration 14.7 years, all followed from disease onset) and 32 healthy controls (HC) had 23Na and 1H-MRI. The TSC in cortical grey matter (CGM), deep grey matter (DGM), normal......, grey/white matter tissue volumes. Results: In MS patients the median EDSS was 2 (range 0-7) and 27 (40%) were cognitively impaired. The brain parenchymal, grey matter and white matter fractions were lower in MS patients compared with HC (p...=0.40) and visual memory (β=-0.06, 95%CI -0.11, -.0.02, R2=0.19). Conclusion: Sodium accumulation in cortical and deep grey matter may reflect underlying neurodegeneration that is relevant to the development of long-term disability and cognitive impairment in relapse-onset MS. 23Na-MRI may become a secondary...

  8. Progress on Nuclear Data Covariances: AFCI-1.2 Covariance Library

    Energy Technology Data Exchange (ETDEWEB)

    Oblozinsky,P.; Oblozinsky,P.; Mattoon,C.M.; Herman,M.; Mughabghab,S.F.; Pigni,M.T.; Talou,P.; Hale,G.M.; Kahler,A.C.; Kawano,T.; Little,R.C.; Young,P.G

    2009-09-28

    Improved neutron cross section covariances were produced for 110 materials including 12 light nuclei (coolants and moderators), 78 structural materials and fission products, and 20 actinides. Improved covariances were organized into AFCI-1.2 covariance library in 33-energy groups, from 10{sup -5} eV to 19.6 MeV. BNL contributed improved covariance data for the following materials: {sup 23}Na and {sup 55}Mn where more detailed evaluation was done; improvements in major structural materials {sup 52}Cr, {sup 56}Fe and {sup 58}Ni; improved estimates for remaining structural materials and fission products; improved covariances for 14 minor actinides, and estimates of mubar covariances for {sup 23}Na and {sup 56}Fe. LANL contributed improved covariance data for {sup 235}U and {sup 239}Pu including prompt neutron fission spectra and completely new evaluation for {sup 240}Pu. New R-matrix evaluation for {sup 16}O including mubar covariances is under completion. BNL assembled the library and performed basic testing using improved procedures including inspection of uncertainty and correlation plots for each material. The AFCI-1.2 library was released to ANL and INL in August 2009.

  9. Tunable states of interlayer cations in two-dimensional materials

    Energy Technology Data Exchange (ETDEWEB)

    Sato, K.; Numata, K. [Department of Environmental Sciences, Tokyo Gakugei University, Koganei, Tokyo 184-8501 (Japan); Dai, W. [Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education), College of Chemistry, Nankai University, Tianjin 300071 (China); Hunger, M. [Institute of Chemical Technology, University of Stuttgart, 70550 Stuttgart (Germany)

    2014-03-31

    The local state of cations inside the Ångstrom-scale interlayer spaces is one of the controlling factors for designing sophisticated two-dimensional (2D) materials consisting of 2D nanosheets. In the present work, the molecular mechanism on how the interlayer cation states are induced by the local structures of the 2D nanosheets is highlighted. For this purpose, the local states of Na cations in inorganic 2D materials, in which the compositional fluctuations of a few percent are introduced in the tetrahedral and octahedral units of the 2D nanosheets, were systematically studied by means of {sup 23}Na magic-angle-spinning (MAS) nuclear magnetic resonance (NMR) and {sup 23}Na multiple-quantum MAS (MQMAS) NMR spectroscopy. In contrast with an uniform distribution of Na cations expected so far, various well-defined cation states sensitive to the local structures of the 2D nanosheets were identified. The tunability of the interlayer cation states along with the local structure of the 2D nanosheets, as the smallest structural unit of the 2D material, is discussed.

  10. Material and structural characterization of alkali activated low-calcium brown coal fly ash.

    Science.gov (United States)

    Skvára, Frantisek; Kopecký, Lubomír; Smilauer, Vít; Bittnar, Zdenek

    2009-09-15

    The waste low-calcium Czech brown coal fly ash represents a considerable environmental burden due to the quantities produced and the potentially high content of leachable heavy metals. The heterogeneous microstucture of the geopolymer M(n) [-(Si-O)(z)-Al-O](n).wH(2)O, that forms during the alkaline activation, was examined by means of microcalorimetry, XRD, TGA, DSC, MIP, FTIR, NMR MAS ((29)Si, (27)Al, (23)Na), ESEM, EDS, and EBSD. The leaching of heavy metals and the evolution of compressive strength were also monitored. The analysis of raw fly ash identified a number of different morphologies, unequal distribution of elements, Fe-rich rim, high internal porosity, and minor crystalline phases of mullite and quartz. Microcalorimetry revealed exothermic reactions with dependence on the activator alkalinity. The activation energy of the geopolymerization process was determined as 86.2kJ/mol. The X-ray diffraction analysis revealed no additional crystalline phases associated with geopolymer formation. Over several weeks, the (29)Si NMR spectrum testified a high degree of polymerization and Al penetration into the SiO(4) tetrahedra. The (23)Na NMR MAS spectrum hypothesized that sodium is bound in the form of Na(H(2)O)(n) rather than Na(+), thus causing efflorescence in a moisture-gradient environment. As and Cr(6+) are weakly bonded in the geopolymer matrix, while excellent immobilization of Zn(2+), Cu(2+), Cd(2+), and Cr(3+) are reported.

  11. The structure and binding mode of citrate in the stabilization of gold nanoparticles

    Science.gov (United States)

    Al-Johani, Hind; Abou-Hamad, Edy; Jedidi, Abdesslem; Widdifield, Cory M.; Viger-Gravel, Jasmine; Sangaru, Shiv Shankar; Gajan, David; Anjum, Dalaver H.; Ould-Chikh, Samy; Hedhili, Mohamed Nejib; Gurinov, Andrei; Kelly, Michael J.; El Eter, Mohamad; Cavallo, Luigi; Emsley, Lyndon; Basset, Jean-Marie

    2017-09-01

    Elucidating the binding mode of carboxylate-containing ligands to gold nanoparticles (AuNPs) is crucial to understand their stabilizing role. A detailed picture of the three-dimensional structure and coordination modes of citrate, acetate, succinate and glutarate to AuNPs is obtained by 13C and 23Na solid-state NMR in combination with computational modelling and electron microscopy. The binding between the carboxylates and the AuNP surface is found to occur in three different modes. These three modes are simultaneously present at low citrate to gold ratios, while a monocarboxylate monodentate (1κO1) mode is favoured at high citrate:gold ratios. The surface AuNP atoms are found to be predominantly in the zero oxidation state after citrate coordination, although trace amounts of Auδ+ are observed. 23Na NMR experiments show that Na+ ions are present near the gold surface, indicating that carboxylate binding occurs as a 2e- L-type interaction for each oxygen atom involved. This approach has broad potential to probe the binding of a variety of ligands to metal nanoparticles.

  12. Proton induced γ-ray emission yields for the analysis of light elements in aerosol samples in an external beam set-up

    Science.gov (United States)

    Calzolai, G.; Chiari, M.; Lucarelli, F.; Nava, S.; Portarena, S.

    2010-05-01

    The PIXE technique is a reliable tool for the characterisation of thin aerosol samples, but it can underestimate the lightest measurable elements, like Na, Mg, Al, Si and P, owing to the absorption of their X-rays inside the sample. The PIGE technique is a valid help to determine corrections for such effect: in order to perform PIGE measurements relative to thin reference standards in an external beam set-up, we measured, at the external beam facility of the Tandetron accelerator of the LABEC laboratory in Florence, the γ-ray yields as a function of the proton beam energy for the reactions 19F(p,p'γ) 19F ( Eγ = 110 and 197 keV), 23Na(p,p'γ) 23Na ( Eγ = 440 keV) and 27Al(p,p'γ) 27Al ( Eγ = 843 and 1013 keV), in the proton energy range from 3 to 5 MeV. The measured yields are shown, and the determined most suitable energies for performing PIGE quantification of Na and Al are reported, together with the corresponding minimum detection limits (MDLs). The results of some test on PIGE accuracy and an evaluation of self-absorption effects in PIXE measurements on thin aerosol samples are also presented.

  13. Determination of radionuclides produced by neutrons in heavily exposed workers of the JCO criticality accident in Tokai-mura for estimating an individual's neutron fluence.

    Science.gov (United States)

    Muramatsu, Y; Noda, Y; Yonehara, H; Ishigure, N; Yoshida, S; Yukawa, M; Tagami, K; Ban-Nai, T; Uchida, S; Hirama, T; Akashi, M; Nakamura, Y

    2001-09-01

    In the Tokai-mura criticality accident, three workers were heavily exposed. Biological materials, such as blood, urine, vomit and hair, were collected from the workers and analyzed for radioactivities, produced by the neutron irradiation. Activation products. such as 24Na, -K and 82Br, were found in these materials by gamma-ray spectrometry. The radionuclide of the highest activity observed in biological materials was 24Na, e.g. the concentrations of this nuclide in the blood samples from the three patients at the accident time were 169, 92 and 23 Bq/ml, respectively. The concentrations of stable sodium in the same samples were determined by ICP-AES to obtain specific activities of 24Na (concentration ratio between the produced 24Na and stable 23Na), which are essential for estimating the neutron fluences and radiation doses. The specific activities of 24Na obtained for the three patients through the blood analysis were 8.2 x 10(4),4.3 x 10(4) and 1.2 x 10(4) Bq24Na/g23Na. Based on these values, individual's neutron fluences were estimated to be 5.7 x 10(11), 3.0 x 10(-1) and 0.85 x 10(11) cm(-2), respectively.

  14. Measurement of the relationship of {sup 24} Na activity and the received neutron dose; Medicion de la relacion de la actividad de {sup 24}Na y la dosis de neutrones recibida

    Energy Technology Data Exchange (ETDEWEB)

    Gossio, S.; Carrelli, J.; Villella, A.; Soppe, E., E-mail: sgossio@arn.gob.ar [Autoridad Regulatoria Nuclear (ARN), Buenos Aires (Argentina)

    2013-07-01

    In cases of criticality accidents it is required a fast dosimetric system that allows to evaluate the doses of the personnel involved. The reaction (n,y) with sodium presented in the body ({sup 23}Na), generates {sup 24}Na, that emits two gamma of 1369KeV and 2754 KeV that can be measured using a whole body counter. The experienced were carried out with the irradiation of {sup 252} Cf of a phantom with a solution of NaCl in water. After the irradiation it was measured the {sup 24}Na activity in the whole body counter, which has a HPGe detector previously calibrated in energy and efficiency. Considering the correction by decay, the quantity of {sup 23}Na presented in the body of an adult and elimination curve of {sup 24}Na, it was established a coefficient of neutronic doses by unity of activity of {sup 24}Na measured in the whole body counter. This method is useful for the retrospective estimation of the doses, as well as to carry out a radiological sorting in case of criticality.

  15. NMR and NQR studies of quadrupolar effects in glasses and polycrystals with half-integer spins

    Science.gov (United States)

    Orengo-Aviles, Moises

    NMR and NQR techniques have been used in the present study to investigate glasses and polycrystalline compounds containing nuclei with half-integer spins such as: sp{11}B, sp{23}Na, sp{45}Sc, and sp{93}Nb. The low field ({˜}1.2{-}1.5 Tesla) continuous wave (CW) NMR experiments were performed using the Non-Adiabatic Superfast Passage (NASP) or the slow passage methods. A BRUKER MSL 300 pulsed NMR spectrometer was used for the high field (7.1 Tesla) studies. The CW NQR experiments at room and liquid nitrogen temperature were carried out on a home built Robinson-type spectrometer. Using pulsed NMR the sp{45}Sc response from the glass system CaO-Bsb2Osb3-Scsb2Osb3, yielded a first-order quadrupolar interaction with eta=0 and Qsb{cc}≈617 kHz. A new Sc site with Qsb{cc}=23.44 MHz and eta=0 was found in polycrystalline Scsb2Osb3 and it was confirmed by NQR. Employing the NASP method it was found that the fraction of four-coordinated (Nsb4) boron atoms in the alkali thioborate (Nasb2S-Bsb2Ssb3) glass system follows a 3x/(1 - x) relationship for x≤0.15, where x is the molar fraction of Nasb2S in the glass. For the NQR spectra the 10% Nasb2S content glass exhibited a broader NQR resonance than the NQR resonance for pure v-Bsb2Ssb3. The additional width was attributed to responses of BSsb3 units whose Qsb{cc} values differ somewhat from the BSsb3 units in the pure vitreous Bsb2Ssb3. The CW NASP method was used to study the sp{23}Na response in the Nasb2O*2SiOsb2 glass, heat treated in three ways: annealed, slow cooled and splat quenched. Subjecting the glass to rapid cooling will produce an increased range of values for the components of the electric field gradient (EFG), and, hence an increased range of values for Qsb{cc} and eta. This was observed for the slow cooled sample when compared with the annealed glass. The effect should be seen also from the slow cooled to the splat quenched sample, but this was not observed. Crystalline sodium disilicate was examined by both

  16. Tracking Sodium-Antimonide Phase Transformations in Sodium-Ion Anodes: Insights from Operando Pair Distribution Function Analysis and Solid-State NMR Spectroscopy

    Science.gov (United States)

    2016-01-01

    Operando pair distribution function (PDF) analysis and ex situ 23Na magic-angle spinning solid-state nuclear magnetic resonance (MAS ssNMR) spectroscopy are used to gain insight into the alloying mechanism of high-capacity antimony anodes for sodium-ion batteries. Subtraction of the PDF of crystalline NaxSb phases from the total PDF, an approach constrained by chemical phase information gained from 23Na ssNMR in reference to relevant model compounds, identifies two previously uncharacterized intermediate species formed electrochemically; a-Na3–xSb (x ≈ 0.4–0.5), a structure locally similar to crystalline Na3Sb (c-Na3Sb) but with significant numbers of sodium vacancies and a limited correlation length, and a-Na1.7Sb, a highly amorphous structure featuring some Sb–Sb bonding. The first sodiation breaks down the crystalline antimony to form first a-Na3–xSb and, finally, crystalline Na3Sb. Desodiation results in the formation of an electrode formed of a composite of crystalline and amorphous antimony networks. We link the different reactivity of these networks to a series of sequential sodiation reactions manifesting as a cascade of processes observed in the electrochemical profile of subsequent cycles. The amorphous network reacts at higher voltages reforming a-Na1.7Sb, then a-Na3–xSb, whereas lower potentials are required for the sodiation of crystalline antimony, which reacts to form a-Na3–xSb without the formation of a-Na1.7Sb. a-Na3–xSb is converted to crystalline Na3Sb at the end of the second discharge. We find no evidence of formation of NaSb. Variable temperature 23Na NMR experiments reveal significant sodium mobility within c-Na3Sb; this is a possible contributing factor to the excellent rate performance of Sb anodes. PMID:26824406

  17. Investigation of the hydrothermal crystallisation of the perovskite solid solution NaCe{sub 1−x}La{sub x}Ti{sub 2}O{sub 6} and its defect chemistry

    Energy Technology Data Exchange (ETDEWEB)

    Harunsani, Mohammad H. [Department of Chemistry, University of Warwick, Coventry CV4 7AL (United Kingdom); Woodward, David I. [Department of Physics, University of Warwick, Coventry CV4 7Al (United Kingdom); Peel, Martin D.; Ashbrook, Sharon E. [School of Chemistry, and EaStCHEM University of St. Andrews, North Haugh, St. Andrews, KY16 9ST (United Kingdom); Walton, Richard I., E-mail: r.i.walton@warwick.ac.uk [Department of Chemistry, University of Warwick, Coventry CV4 7AL (United Kingdom)

    2013-11-15

    Perovskites of nominal composition NaCe{sub 1−x}La{sub x}Ti{sub 2}O{sub 6} (0≤x≤1) crystallise directly under hydrothermal conditions at 240 °C. Raman spectroscopy shows distortion from the ideal cubic structure and Rietveld analysis of powder X-ray and neutron diffraction reveals that the materials represent a continuous series in rhombohedral space group R3-bar c. Ce L{sub III}-edge X-ray absorption near edge structure spectroscopy shows that while the majority of cerium is present as Ce{sup 3+} there is evidence for Ce{sup 4+}. The paramagnetic Ce{sup 3+} affects the chemical shift and line width of {sup 23}Na MAS NMR spectra, which also show with no evidence for A-site ordering. {sup 2}H MAS NMR of samples prepared in D{sub 2}O shows the inclusion of deuterium, which IR spectroscopy shows is most likely to be as D{sub 2}O. The deuterium content is highest for the cerium-rich materials, consistent with oxidation of some cerium to Ce{sup 4+} to provide charge balance of A-site water. - Graphical abstract: A multi-element A-site perovskite crystallises directly from aqueous, basic solutions at 240 °C; while the paramagnetic effect of Ce{sup 3+} on the {sup 23}Na NMR shows a homogeneous solid-solution, the incorporation of A-site water is also found from {sup 2}H NMR and IR, with oxidation of some cerium to charge balance proved by XANES spectroscopy. Display Omitted - Highlights: • Direct hydrothermal synthesis allows crystallisation of a perovskite solid-solution. • XANES spectroscopy shows some oxidation of Ce{sup 3+} to Ce{sup 4+}. • The paramagnetism of Ce{sup 3+} shifts and broadens the {sup 23}Na solid-state NMR. • The perovskite materials incorporate water as an A-site defect.

  18. USE OF COVARIANCE MATRICES IN A CONSISTENT (MULTISCALE) DATA ASSIMILATION FOR IMPROVEMENT OF BASIC NUCLEAR PARAMETERS IN NUCLEAR REACTOR APPLICATIONS: FROM METERS TO FEMTOMETERS

    Energy Technology Data Exchange (ETDEWEB)

    G. Palmiotti; M. Salvatores; H. Hiruta; M. Herman; P. Oblozinsky; M. Pigni

    2010-04-01

    A new approach is proposed, the consistent data assimilation, that allows to link the integral data experiment results to basic nuclear parameters employed by evaluators to generate ENDF/B point energy files in order to improve them. A practical example is provided where the sodium neutron propagation experiments, EURACOS and JANUS-8, are used to improve via modifications of 23Na nuclear parameters (like scattering radius, resonance parameters, Optical model parameters, Statistical Hauser-Feshbach model parameters, and Preequilibrium Exciton model parameters) the agreement of calculation versus experiments for a series of measured reaction rate detectors slopes. Future work involves comparison of results against a more traditional multigroup adjustments, and extension to other isotope of interest in the reactor community as 56Fe, actinides, and fission products.

  19. Pilarização de esmectita brasileira para fins catalíticos. Emprego de argila pilarizada na alquilação de benzeno com 1-dodeceno Pillarization of Brazilian smectite for the catalytic of purpose. Use of pillared clay in the alkylation of benzene with 1-dodecene

    Directory of Open Access Journals (Sweden)

    Sidnei Quezada M. Leite

    2000-04-01

    Full Text Available Al-pillared clay was prepared with a Brazilian bentonite from the Campina Grande region (Paraíba, BRAZIL. It was intercalated at 298 K, during 48 hours, with a solution containing [Al3+] = 0.10 mol/L and molar ratio OH/Al = 2.0 prepared at 333 K, and was calcined at 773K. The catalytic activity was evaluated by alkylation of benzene with 1-dodecene. The characterization methods were: X-ray fluorescence and diffraction analysis; 27Al, 29Si and 23Na MAS NMR and textural analysis by N2 adsorption. The thermal stability of the natural clay was improved by the pillaring procedure, as well as the catalytic activity. The intercalated clay presented the highest initial rate of reaction among the systems tested.

  20. Impact of opal nanoconfinement on electronic properties of sodium particles: NMR studies

    Energy Technology Data Exchange (ETDEWEB)

    Charnaya, E.V., E-mail: charnaya@live.com [Department of Physics, National Cheng Kung University, Tainan, 70101 Taiwan (China); Institute of Physics, St. Petersburg State University, St. Petersburg, 198504 (Russian Federation); Lee, M.K. [Department of Physics, National Cheng Kung University, Tainan, 70101 Taiwan (China); MoST Instrument Center at NCKU, Tainan, 70101 Taiwan (China); Chang, L.J. [Department of Physics, National Cheng Kung University, Tainan, 70101 Taiwan (China); Kumzerov, Yu.A.; Fokin, A.V. [A.F. Ioffe Physico-Technical Institute RAS, St. Petersburg, 194021 (Russian Federation); Samoylovich, M.I. [Moscow Institute of Physics and Technology, Moscow, 141700 (Russian Federation); Bugaev, A.S. [CSR Institute of Technology “Technomash”, Moscow, 121108 (Russian Federation)

    2015-03-20

    The {sup 23}Na Knight shift of NMR line which is highly correlated with the electron spin susceptibility and density of states at the Fermi level was studied for the sodium loaded opal. The measurements were carried out within a temperature range from 100 to 400 K for solid and melted confined sodium nanoparticles. The NMR line below 305 K was a singlet with the Knight shift reduced compared to that in bulk. Above this temperature the NMR line split reproducibly into two components with opposite trends in the Knight shift temperature dependences which evidenced a nanoconfinement-induced transformation and heterogeneity in the electron system. The findings were suggested to be related to changes in the topology of the Fermi surface.

  1. Cross-polarization from quadrupolar nuclei to silicon using low-radio-frequency amplitudes during magic-angle spinning

    Energy Technology Data Exchange (ETDEWEB)

    De Paul, S.M.; Ernst, M.; Shore, J.S.; Pines, A. [Lawrence Berkeley National Lab., CA (United States)]|[Univ. of California, Berkeley, CA (United States); Stebbins, J.F. [Stanford Univ., CA (United States)

    1997-04-17

    The dynamics of cross-polarization from the central transition of a quadrupolar nucleus ({sup 27}Al or {sup 23}Na) to a spin-1/2 nucleus ({sup 29}Si) during magic-angle spinning and using low-radio-frequency field strengths are analyzed for the mineral low albite. Under these conditions additional complications in the spin-lock behavior of the quadrupolar nucleus and in the cross-polarization process were found experimentally and are examined in detail. A step-by-step procedure for optimizing cross-polarization from the central transition of a quadrupolar nucleus to a spin-1/2 nucleus is described. Significant enhancement of {sup 29}Si NMR sensitivity and several applications are demonstrated. 50 refs., 8 figs., 4 tabs.

  2. HIE-ISOLDE Faraday cups tested with ion beams at TRIUMF

    CERN Document Server

    Cantero, E D

    2014-01-01

    The future HIE-ISOLDE Faraday cups for both the intercryomodule regions and the HEBTs have been tested using 34S+7, 4He+, 23Na+6 and 20Ne+5 beams from the ISAC-II accelerator at TRIUMF. Their performance has been characterized together with the Faraday cups from REX-ISOLDE and those from ISAC-II. The measurements were done at E/A = 1.5, 2.85 and 5.5 MeV/u, with beam intensities in the range of 100 pA to 4 nA. The performance of these Faraday cups has been compared under the same beam conditions for different bias voltages up to -350 V. Within the experimental uncertainties, most of them coming from fluctuations in beam intensity, all devices showed similar results. Biasing the Faraday cup repeller ring to voltages of at least -60 V, the escape of secondary electrons was suppressed.

  3. Applications of high resolution NMR to geochemistry: crystalline, glass, and molten silicates

    Energy Technology Data Exchange (ETDEWEB)

    Schneider, E.

    1985-11-01

    The nuclear spin interactions and the associated quantum mechanical dynamics which are present in solid state NMR are introduced. A brief overview of aluminosilicate structure is presented and crystalline structure is then reviewed, with emphasis on the contributions made by /sup 29/Si NMR spectroscopy. The local structure of glass aluminosilicates as observed by NMR, is presented with analysis of the information content of /sup 29/Si spectra. A high-temperature (to 1300/sup 0/C) NMR spectroscopic investigation of the local environment and dynamics of molecular motion in molten aluminosilicates is described. A comparison is made of silicate liquid, glass, and crystalline local structure. The atomic and molecular motions present in a melt are investigated through relaxation time (T/sub 1/ and T/sub 2/) measurements as a function of composition and temperature for /sup 23/Na and /sup 29/Si.

  4. NMR Study of Polymer-Surfactant Mixing Systems%聚合物-表面活性剂复合体系的核磁共振研究

    Institute of Scientific and Technical Information of China (English)

    刘雪锋; 方云; 杨扬; 范歆

    2001-01-01

    Study on polymer- surfactant mixing systems by NMR methods were introduced in detail. 13C- NMR, 13C and 23Na+ relaxation rate, paramagnetic relaxation NMR (PR- NMR) and two dimensional nuclear overhauser enhancement NMR (2D - NOESY - NMR) were aplied in studying interaction of polymer- surfactant cluster. The carbon bridge of C12BE in PVP - C12BE clusters was associated with the methine (α), methylene (β) carbons in the polymer backbone and the methyl carbon attached with the N in the PVP ring , which was proven by 13C - NMR. The results of13C - NMR and 23Na+ NMR showed that some chains of the PEG in PEGSDS were directly absorbed at the hydrocarbon/water interface of micelles, whereas most of them formed loops in the surrounding water.2D - NOESY - NMR confirmed that PEG penetrated partly into the interior of the SDS mieelles. PR - NMR results indicated that only a small fraction of PEG located in electric double layer of micellar surface and the stoichiometric composition of PEG - SDS cluster is 1.9EO units per SDS molecule. Cluster structure of PVP - AS looded ilke a necklace whereas PVP - SDS likes a swollen cage.%用核磁共振(NMR)研究聚合物-表面活性剂复合体系的具体实例,分别对用于聚合物与表面活性剂相互作用及聚合物-表面活性剂团簇结构剖析等领域的13C-NMR、13C-及反离子23Na+-弛豫、顺磁共振驰豫(PR-NMR)、二维核子Overhauser增强核磁共振(2D-NOESY-NMR)等手段作了详尽的概述。在13C-NMR研究中发现PVP-C12BE体系中PVP骨架上α-CH、β-CH2和吡咯环上与N相连的亚甲基吸附在C12BE胶束表面的碳氢链部位,其相互作用驱动力为疏水力。13CNMR、23Na+-NMR研究表明在PEG-SDS团簇结构中大部分PEG链节环绕在SDS胶束周围,少部分PEG链节吸附在烃/水界面上;2D-NOESY-NMR研究结果表明,有少部分PEG链节渗入到SDS胶束内部;PR-NMR结果显示少部分PEG链节存在于SDS胶束双电层内,PEG-SDS团簇的

  5. Formation of ultracold NaRb Feshbach molecules

    Science.gov (United States)

    Wang, Fudong; He, Xiaodong; Li, Xiaoke; Zhu, Bing; Chen, Jun; Wang, Dajun

    2015-03-01

    We report the creation of ultracold bosonic 23Na87Rb Feshbach molecules via magneto-association. By ramping the magnetic field across an interspecies Feshbach resonance (FR), at least 4000 molecules can be produced out of the near degenerate ultracold mixture. Fast loss due to inelastic atom-molecule collisions is observed, which limits the pure molecule number, after residual atoms removal, to 1700. The pure molecule sample can live for 21.8(8) ms in the optical trap, long enough for future molecular spectroscopy studies toward coherently transferring to the singlet ro-vibrational ground state, where these molecules are stable against chemical reaction and have a permanent electric dipole moment of 3.3 Debye. We have also measured the Feshbach molecule’s binding energy near the FR by the oscillating magnetic field method and found these molecules have a large closed-channel fraction.

  6. Formation of Ultracold NaRb Feshbach Molecules

    CERN Document Server

    Wang, Fudong; Li, Xiaoke; Zhu, Bing; Chen, Jun; Wang, Dajun

    2015-01-01

    We report the creation of ultracold bosonic $^{23}$Na$^{87}$Rb Feshbach molecules via magneto-association. By ramping the magnetic field across an interspecies Feshbach resonance, at least 4000 molecules can be produced out of the near degenerate ultracold mixture. Fast loss due to inelastic atom-molecule collisions is observed, which limits the pure molecule number, after residual atoms removal, to 1700. The pure molecule sample can live for 21.8(8) ms in the optical trap, long enough for future molecular spectroscopy studies toward coherently transferring to the singlet ro-vibrational ground state, where these molecules are stable against chemical reaction and have a permanent electric dipole moment of 3.3 Debye. We have also measured the Feshbach molecule's binding energy near the Feshbach resonance by the oscillating magnetic field method and found these molecules have a large closed-channel fraction.

  7. Synthesis and crystal structure of chlorate-enclathrated in aluminogermanate sodalite Na8[AlGeO4]6(ClO3)2

    Science.gov (United States)

    Borhade, Ashok V.; Dholi, Arun G.

    2013-04-01

    Encapsulation of chlorate in sodalite with aluminogermanate host framework has been obtained by one pot hydrothermal synthesis at 393 K. The crystal structure of Na8[AlGeO4]6(ClO3)2; sodalite was refined from X-ray powder data in the space group Pbar 43 n: a = 9.169 Å, where Al-O-Ge angle is 137.6°. The 27Al MAS NMR study confirmed alternate Ge and Al ordering of the sodalite framework, while 23Na gave insight into the structure and dynamics of the cage fillings. Infrared spectrum confirmed the encapsulation of chlorate as well as the framework formation of aluminogermanate sodalite. SEM study showed the retention of cubical morphology of the aluminogermanate sodalite. Thermogravimetric analysis provided information on the extent of chlorate entrapment, stability within the sodalite cages and decomposition properties.

  8. Proton Spectroscopic Factors Deduced from Helium-3 Global Phenomenological and Microscopic Optical Model Potentials

    Science.gov (United States)

    Jenny, Lee; Pang, Dan-Yang; Han, Yin-Lu; B. Tsang, M.

    2014-09-01

    Global phenomenological GDP08 and microscopic helium-3 optical model potentials have been recently derived. We evaluate these two potential sets by comparing the elastic scattering data of 25 MeV 3He on 16O, 18O, 19F, 23Na, 24Mg, 25Mg, 26Mg, 27Al, 28Si, 30Si, 31P, 32S, 34S, 35Cl, 37Cl, and 39K isotopes. Using the deuteron angular distributions calculated with the distorted wave Born approximation model, we extract the ground-state proton spectroscopic factors from (3He, d) reactions on the same set of nuclei. The extracted proton spectroscopic factors are compared with the large-basis shell-model calculations.

  9. Chemosensitivity assay in mice prostate tumor: Preliminary report of flow cytometry, DNA fragmentation, ion ratiometric methods of anti-neoplastic drug monitoring

    Directory of Open Access Journals (Sweden)

    Kline Richard

    2004-03-01

    Full Text Available Abstract Flow cytometry, DNA fragmentation, ion ratiomateric analysis and NMR peaks characterized drug chemosensitivity of antineoplastic drugs. Hypotheses were: 1. The chemosensitive effect of different cancer cell lines is characteristic; 2. DNA fragmentation, ion ratiometric analysis suggest apoptosis status of tumor cells. Methods PC-3 cell lines were compared with DU-145, LNCaP cell lines in culture for the [Na]i and [Ca]i ion sensing dyes, cell death, NMR peaks and apoptosis staining for chemotherapeutic action of different drugs. Results DNA fragmentation, ratiometric ions and fluorescence endlabelling plots were characteristic for cell lines and drug response. 31P-23Na NMR spectra showed characteristic high phospho-choline and sodium peaks. Conclusion Flow cytometry, DNA fragmentation, ion ratiometric methods and NMR peaks indicated apoptosis and offered in vivo drug monitoring method.

  10. Coherent Control of Ground State NaK Molecules

    Science.gov (United States)

    Yan, Zoe; Park, Jee Woo; Loh, Huanqian; Will, Sebastian; Zwierlein, Martin

    2016-05-01

    Ultracold dipolar molecules exhibit anisotropic, tunable, long-range interactions, making them attractive for the study of novel states of matter and quantum information processing. We demonstrate the creation and control of 23 Na40 K molecules in their rovibronic and hyperfine ground state. By applying microwaves, we drive coherent Rabi oscillations of spin-polarized molecules between the rotational ground state (J=0) and J=1. The control afforded by microwave manipulation allows us to pursue engineered dipolar interactions via microwave dressing. By driving a two-photon transition, we are also able to observe Ramsey fringes between different J=0 hyperfine states, with coherence times as long as 0.5s. The realization of long coherence times between different molecular states is crucial for applications in quantum information processing. NSF, AFOSR- MURI, Alfred P. Sloan Foundation, DARPA-OLE

  11. Detailed balance study of time reversal invariance with interfering resonancesrefid="FN1">*

    Science.gov (United States)

    Mitchell, G. E.; Bilpuch, E. G.; Bybee, C. R.; Drake, J. M.; Shriner, J. F.

    1993-06-01

    Bunakov and Weidenmüller suggested that large enhancement of time reversal invariance violation may be observed near two interfering resonances via a test of detailed balance. In our (p, α) resonance data on 23Na, 27Al, 31P, 35Cl, and 39K, there are 33 pairs of adjacent resonances which have the same spin and parity. The difference in the differential cross sections for the (p, α 0) and (α, p 0) reactions was calculated for these resonance pairs using experimental values for the partial widths. The collision matrix elements were obtained for a Hamiltonian H = H0 + iH', following the approach of Moldauer. The differences show striking dependence on energy and angle and on the particular pair of resonances, with the relative sensitivity of the detailed balance test varying by many orders of magnitude. These preliminary results indicate that this class of experiments may be more sensitive than previous detailed balance tests.

  12. Double rotation NMR studies of zeolites and aluminophosphate molecular sieves

    Energy Technology Data Exchange (ETDEWEB)

    Jelinek, R. [California Univ., Berkeley, CA (United States). Dept. of Chemistry]|[Lawrence Berkeley Lab., CA (United States)

    1993-07-01

    Goal is to study the organization and structures of guest atoms and molecules and their reactions on internal surfaces within pores of zeolites and aluminophosphate molecular sieves. {sup 27}Al and {sup 23}Na double rotation NMR (DOR) is used since it removes the anisotropic broadening in NMR spectra of quadrupolar nuclei, thus increasing resolution. This work concentrates on probing aluminum framework atoms in aluminophosphate molecular sieves and sodium extra framework cations in porous aluminosilicates. In aluminophosphates, ordering and electronic environments of the framework {sup 27}Al nuclei are modified upon adsorption of water molecules within the channels; a relation is sought between the sieve channel topology and the organization of adsorbed water, as well as the interaction between the Al nuclei and the water molecules. Extra framework Na{sup +} cations are directly involved in adsorption processes and reactions in zeolite cavities.

  13. Improvement of Sodium Neutronic Nuclear Data for the Computation of Generation IV Reactors; Contribution a l'amelioration des donnees nucleaires neutroniques du sodium pour le calcul des reacteurs de generation IV

    Energy Technology Data Exchange (ETDEWEB)

    Archier, P.

    2011-09-14

    The safety criteria to be met for Generation IV sodium fast reactors (SFR) require reduced and mastered uncertainties on neutronic quantities of interest. Part of these uncertainties come from nuclear data and, in the particular case of SFR, from sodium nuclear data, which show significant differences between available international libraries (JEFF-3.1.1, ENDF/B-VII.0, JENDL-4.0). The objective of this work is to improve the knowledge on sodium nuclear data for a better calculation of SFR neutronic parameters and reliable associated uncertainties. After an overview of existing {sup 23}Na data, the impact of the differences is quantified, particularly on sodium void reactivity effects, with both deterministic and stochastic neutronic codes. Results show that it is necessary to completely re-evaluate sodium nuclear data. Several developments have been made in the evaluation code Conrad, to integrate new nuclear reactions models and their associated parameters and to perform adjustments with integral measurements. Following these developments, the analysis of differential data and the experimental uncertainties propagation have been performed with Conrad. The resolved resonances range has been extended up to 2 MeV and the continuum range begins directly beyond this energy. A new {sup 23}Na evaluation and the associated multigroup covariances matrices were generated for future uncertainties calculations. The last part of this work focuses on the sodium void integral data feedback, using methods of integral data assimilation to reduce the uncertainties on sodium cross sections. This work ends with uncertainty calculations for industrial-like SFR, which show an improved prediction of their neutronic parameters with the new evaluation. (author) [French] Les criteres de surete exiges pour les reacteurs rapides au sodium de Generation IV (RNR-Na) se traduisent par la necessite d'incertitudes reduites et maitrisees sur les grandeurs neutroniques d'interet. Une part

  14. Two-dimensional MAS NMR correlation protocols involving double-quantum filtering of quadrupolar spin-pairs.

    Science.gov (United States)

    Edén, Mattias

    2010-05-01

    Three two-dimensional (2D) NMR homonuclear correlation techniques invoking double-quantum (2Q) filtration of the central transitions of half-integer spins are evaluated numerically and experimentally. They correlate directly detected single-quantum (1Q) coherences in the t(2) domain with either of 1Q, two-spin 2Q or single-spin multiple-quantum coherence-evolutions in the indirect (t(1)) dimension. We employ experimental (23)Na and (27)Al NMR on sodium sulfite and the natural mineral sillimanite (SiAl(2)O(5)), in conjunction with simulated 2D spectra from pairs of dipolar-recoupled spins-3/2 and 5/2 at different external magnetic fields, to compare the correlation strategies from the viewpoints of 2D spectral resolution, signal sensitivity, implementational aspects and their relative merits for establishing internuclear proximities and quadrupolar tensor orientations.

  15. Structural basis for the transformation pathways of the sodium naproxen anhydrate-hydrate system

    DEFF Research Database (Denmark)

    Bond, Andrew; Cornett, Claus; Larsen, Flemming Hofmann

    2014-01-01

    Crystal structures are presented for two dihydrate polymorphs (DH-I and DH-II) of the non-steroidal anti-inflammatory drug sodium (S)-naproxen. The structure of DH-I is determined from twinned single crystals obtained by solution crystallization. DH-II is obtained by solid-state routes, and its...... structure is derived using powder X-ray diffraction, solid-state (13)C and (23)Na MAS NMR, and molecular modelling. The validity of both structures is supported by dispersion-corrected density functional theory (DFT-D) calculations. The structures of DH-I and DH-II, and in particular their relationships...... to the monohydrate (MH) and anhydrate (AH) structures, provide a basis to rationalize the observed transformation pathways in the sodium (S)-naproxen anhydrate-hydrate system. All structures contain Na(+)/carboxylate/H2O sections, alternating with sections containing the naproxen molecules. The structure of DH...

  16. Implementing quantum electrodynamics with ultracold atomic systems

    CERN Document Server

    Kasper, V; Jendrzejewski, F; Oberthaler, M K; Berges, J

    2016-01-01

    We discuss the experimental engineering of model systems for the description of QED in one spatial dimension via a mixture of bosonic $^{23}$Na and fermionic $^6$Li atoms. The local gauge symmetry is realized in an optical superlattice, using heteronuclear boson-fermion spin-changing interactions which preserve the total spin in every local collision. We consider a large number of bosons residing in the coherent state of a Bose-Einstein condensate on each link between the fermion lattice sites, such that the behavior of lattice QED in the continuum limit can be recovered. The discussion about the range of possible experimental parameters builds, in particular, upon experiences with related setups of fermions interacting with coherent samples of bosonic atoms. We determine the atomic system's parameters required for the description of fundamental QED processes, such as Schwinger pair production and string breaking. This is achieved by benchmark calculations of the atomic system and of QED itself using function...

  17. First direct measurement of 12C(12C,n23Mg at stellar energies

    Directory of Open Access Journals (Sweden)

    Tang X.D.

    2016-01-01

    Full Text Available Neutrons produced by the carbon fusion reaction 12C(12C,n23Mg play an important role in stellar nucleosynthesis. Past studies have shown large discrepancies between experimental data and theory, leading to an uncertain cross section extrapolation at astrophysical energies. We present the first direct measurement which extends deep into the astrophysical energy range along with a new and improved extrapolation technique based on experimental data from the mirror reaction 12C(12C,p23Na. The new reaction rate has been determined with a well-defined uncertainty which exceeds the precision required by astrophysics models. Using our constrained rate, we find that 12C(12C,n23Mg is crucial to the production of Na and Al in Pop-III Pair Instability Supernovae.

  18. Measurements of high-energy {gamma}-rays with LaBr{sub 3}:Ce detectors

    Energy Technology Data Exchange (ETDEWEB)

    Ciemala, M. [Niewodniczanski Institute of Nuclear Physics, Polish Academy of Sciences, ul. Radzikowskiego 152, 31-342 Krakow (Poland)], E-mail: Michal.Ciemala@ifj.edu.pl; Balabanski, D. [INRNE, Bulgarian Academy of Sciences, BG-1784 Sofia (Bulgaria); Csatlos, M. [Institute of Nuclear Research of the Hungarian Academy of Sciences (ATOMKI), P.O. Box 51, H-4001 Debrecen (Hungary); Daugas, J.M. [CEA, DAM, DIF, F-91297 Arpajon Cedex (France); Georgiev, G. [Centre de Spectrometrie Nucleaire et de Spectrometrie de Masse (CSNSM), IN2P3-CNRS and Universite Paris-Sud, Bat 104-108, F-91405 Orsay Cedex (France); Gulyas, J. [Institute of Nuclear Research of the Hungarian Academy of Sciences (ATOMKI), P.O. Box 51, H-4001 Debrecen (Hungary); Kmiecik, M. [Niewodniczanski Institute of Nuclear Physics, Polish Academy of Sciences, ul. Radzikowskiego 152, 31-342 Krakow (Poland); Krasznahorkay, A. [Institute of Nuclear Research of the Hungarian Academy of Sciences (ATOMKI), P.O. Box 51, H-4001 Debrecen (Hungary); Lalkovski, S. [Faculty of Physics, University of Sofia, BG-1164 (Bulgaria); Lefebvre-Schuhl, A. [Centre de Spectrometrie Nucleaire et de Spectrometrie de Masse (CSNSM), IN2P3-CNRS and Universite Paris-Sud, Bat 104-108, F-91405 Orsay Cedex (France); Lozeva, R. [Instituut voor Kernen Stralingsfysica (IKS), Katholieke Universiteit Leuven, B-3001 Leuven (Belgium); Maj, A. [Niewodniczanski Institute of Nuclear Physics, Polish Academy of Sciences, ul. Radzikowskiego 152, 31-342 Krakow (Poland); Vitez, A. [Institute of Nuclear Research of the Hungarian Academy of Sciences (ATOMKI), P.O. Box 51, H-4001 Debrecen (Hungary)

    2009-09-01

    The full-energy peak efficiency calibration and the energy resolution measurements of the 2in.x2in.LaBr{sub 3}{gamma}-ray detector are presented for {gamma}-ray energies in the 700 keV-17.6 MeV range. Measurements were done using a combination of proton-capture nuclear reactions on {sup 27}Al, {sup 23}Na, {sup 39}K, {sup 7}Li and {sup 11}B for high-energy {gamma}-rays, and radioactive sources such as {sup 60}Co and {sup 152}Eu for the lowest energies. At high energies, two {gamma}-rays in a cascade from proton resonance capture were employed using Al, Na{sub 2}WO{sub 4}, K{sub 2}SO{sub 4} and LiBO{sub 2} targets. The obtained results were compared to the simulations performed using a GEANT4 code.

  19. Dose evaluation based on 24Na activity in the human body at the JCO criticality accident in Tokai-mura.

    Science.gov (United States)

    Momose, T; Tsujimura, N; Tasaki, T; Kanai, K; Kurihara, O; Hayashi, N; Shinohara, K

    2001-09-01

    24Na in the human body, activated by neutrons emitted at the JCO criticality accident, was observed for 62 subjects, where 148 subjects were measured by the whole body counter of JNC Tokai Works. The 148 subjects, including JCO employees and the contractors, residents neighboring the site and emergency service officers, were measured by the whole-body counter. The neutron-energy spectrum around the facility was calculated using neutron transport codes (ANISN and MCNP), and the relation between an amount of activated sodium in human body and neutron dose was evaluated from the calculated neutron energy spectrum and theoretical neutron capture probability by the human body. The maximum 24Na activity in the body was 7.7 kBq (83 Bq(24Na)/g(23Na)) and the relevant effective dose equivalent was 47 mSv.

  20. Nuclear magnetic resonance investigation of metallic sodium nanoparticles in porous glass

    Science.gov (United States)

    Uskov, A. V.; Nefedov, D. Yu.; Charnaya, E. V.; Shevchenko, E. V.; Haase, J.; Michel, D.; Kumzerov, Yu. A.; Fokin, A. V.; Bugaev, A. S.

    2016-06-01

    Sodium nanoparticles embedded in porous glass have been studied by NMR. The measurements have been carried out on pulse spectrometers in magnetic fields of 9.4 and 17.6 T in a wide temperature range. Changes in the magnitude and temperature dependence of the 23Na Knight shift with respect to those in bulk sodium have been discovered. An additional component of the NMR line shifted to high frequencies has been observed in the temperature range from 240 to 100 K. Investigation of the specific heat has revealed a considerable decrease in the melting and crystallization temperatures of sodium under nanoconfinement, which were not accompanied by abrupt changes in the Knight shift.

  1. Relaxation-allowed nuclear magnetic resonance transitions by interference between the quadrupolar coupling and the paramagnetic interaction.

    Science.gov (United States)

    Ling, Wen; Jerschow, Alexej

    2007-02-14

    Of the various ways in which nuclear spin systems can relax to their ground states, the processes involving an interference between different relaxation mechanisms, such as dipole-dipole coupling and chemical shift anisotropy, have become of great interest lately. The authors show here that the interference between the quadrupolar coupling and the paramagnetic interaction (cross-correlated relaxation) gives rise to nuclear spin transitions that would remain forbidden otherwise. In addition, frequency shifts arise. These would be reminiscent of residual anisotropic interactions when there are none. While interesting from a fundamental point of view, these processes may become relevant in magnetic resonance imaging experiments which involve quadrupolar spins, such as (23)Na, in the presence of contrast agents. Geometrical constraints in paramagnetic molecule structures may likewise be derived from these interference effects.

  2. New JEFF-3.2 Sodium Neutron Induced Cross-sections Evaluation for Neutron Fast Reactors Applications: from 0 to 20 MeV

    Science.gov (United States)

    Archier, P.; Noguère, G.; De Saint Jean, C.; Plompen, A. J. M.; Rouki, C.

    2014-04-01

    In the framework of the ASTRID project, a new 23Na evaluation, containing re-evaluated nuclear data and associated covariances, has been prepared to be submitted for the future JEFF-3.2 library. This work has been motivated mainly because the current JEFF-3.1.1 sodium evaluation showed large differences with microscopic measurements and does not have covariances data. Recent experimental data from IRMM and high resolution measurements from Larson have been simultaneously analyzed with the data assimilation code CONRAD and a good agreement with the evaluated cross-sections has been achieved. Experimental systematic uncertainties have been propagated to the nuclear reaction model parameters in order to produce a coherent set of covariance data. Several figures are provided in this paper to illustrate the new features of this evaluation.

  3. Neutron Inelastic Scattering Measurements for Na, Ge, Zr, Mo and U

    Science.gov (United States)

    Bacquias, A.; Dessagne, Ph.; Kerveno, M.; Rudolf, G.; Plompen, A. J. M.; Drohé, J. C.; Rouki, C.; Nankov, N.; Nyman, M.; Borcea, C.; Negret, A.; Archier, P.; De Saint Jean, C.; Noguère, G.; Vaglio-Gaudard, C.; Koning, A.; Domula, A.; Zuber, K.; Leal, L. C.

    2014-05-01

    Studies for advanced reactor systems such as sodium-cooled fast reactors designed for recycling of high level waste, accelerator driven systems for transmutation, and systems envisioning the use of the Th/U fuel cycle impose tight requirements on nuclear data for accurate predictions of their operation and safety characteristics. Among the identified needs established by sensitivity studies, neutron inelastic scattering on the main structural materials and actinides and some (n,xn) cross sections for actinides feature prominently. Prompt-gamma spectroscopy and time-of-flight techniques were used to measure (n,xnγ) cross-sections of interest. Experiments were performed at the GELINA neutron time-of-flight facility of IRMM. Results for 235U and 23Na are briefly recalled; pertaining theoretical discussions are mentioned to explain observations concerning 238U. The status of studies on 76Ge, Zr and Mo is also reported.

  4. [NMR spectrometry in vivo with a resistive magnet at 1,2 T].

    Science.gov (United States)

    Mehier, H; Maurice, M; Bonche, J P; Gaillard, E; Foray, J; Roussel, B

    1988-01-01

    A resistive magnet, operating at 1.2 T, intended to magnetic resonance spectroscopy in man was set up and evaluated in the hospital of Chamonix. Drusch S.A. in collaboration with Institut d' Electronique fondamentale built the system with the following characteristics: weight: 12 t, pole diameter: 55 cm, distance between coils: 36 cm. Cooling the magnet was provided by water flowing at 50 l/min. The magnetic field homogeneity was 3 X 10(-7) in a 60 mm diameter sphere. Stability was regulated at +/- 1 mGs. Five correcting circuits were used (X, Y, Z, Z2, XY). For experiments in man useful window was 120 X 20 cm and allowed measurements in brain and limbs. With this type of magnet, 1H, 31P and 23Na NMR spectra equalled in quality those obtained with superconducting magnets which work at a very higher cost.

  5. Quantum coherent tractor beam effect for atoms trapped near a nanowaveguide

    Science.gov (United States)

    Sadgrove, Mark; Wimberger, Sandro; Nic Chormaic, Síle

    2016-01-01

    We propose several schemes to realize a tractor beam effect for ultracold atoms in the vicinity of a few-mode nanowaveguide. Atoms trapped near the waveguide are transported in a direction opposite to the guided mode propagation direction. We analyse three specific examples for ultracold 23Na atoms trapped near a specific nanowaveguide (i.e. an optical nanofibre): (i) a conveyor belt-type tractor beam effect, (ii) an accelerator tractor beam effect, and (iii) a quantum coherent tractor beam effect, all of which can effectively pull atoms along the nanofibre toward the light source. This technique provides a new tool for controlling the motion of particles near nanowaveguides with potential applications in the study of particle transport and binding as well as atom interferometry. PMID:27440516

  6. Precision atomic mass spectrometry with applications to fundamental constants, neutrino physics, and physical chemistry

    Energy Technology Data Exchange (ETDEWEB)

    Mount, Brianna J. [Florida State University, Department of Physics (United States); Redshaw, Matthew [National Superconducting Cyclotron Laboratory (United States); Myers, Edmund G., E-mail: myers@nucmar.physics.fsu.edu [Florida State University, Department of Physics (United States)

    2011-07-15

    We present a summary of precision atomic mass measurements of stable isotopes carried out at Florida State University. These include the alkalis {sup 6}Li, {sup 23}Na, {sup 39,41}K, {sup 85,87}Rb, {sup 133}Cs; the rare gas isotopes {sup 84,86}Kr and {sup 129,130,132,136}Xe; {sup 17,18}O, {sup 19}F, {sup 28}Si, {sup 31}P, {sup 32}S; and various isotope pairs of importance to neutrino physics, namely {sup 74,76}Se/{sup 74,76}Ge, {sup 130}Xe/{sup 130}Te, and {sup 115}In/{sup 115}Sn. We also summarize our Penning trap measurements of the dipole moments of PH{sup + } and HCO{sup + }.

  7. A quantum mechanics/molecular dynamics study of electric field gradient fluctuations in the liquid phase. The case of Na+ in aqueous solution.

    Science.gov (United States)

    Aidas, Kęstutis; Ågren, Hans; Kongsted, Jacob; Laaksonen, Aatto; Mocci, Francesca

    2013-02-07

    The (23)Na quadrupolar coupling constant of the Na(+) ion in aqueous solution has been predicted using molecular dynamics simulations and hybrid quantum mechanics/molecular mechanics methods for the calculation of electric field gradients. The developed computational approach is generally expected to provide reliable estimates of the quadrupolar coupling constants of monoatomic species in condensed phases, and we show here that intermolecular polarization and non-electrostatic interactions are of crucial importance as they result in a 100% increased quadrupolar coupling constant of the ion as compared to a simpler pure electrostatic picture. These findings question the reliability of the commonly applied classical Sternheimer approximation for the calculations of the electric field gradient. As it can be expected from symmetry considerations, the quadrupolar coupling constants of the 5- and 6-coordinated Na(+) ions in solution are found to differ significantly.

  8. CHARAKTERYSTYKA HELIOSTATÓW I ICH ZASTOSOWANIE W HELIOELEKTROWNIACH

    Directory of Open Access Journals (Sweden)

    Paweł WAJSS

    Full Text Available Rozwój energetyki słonecznej związany jest z powstawaniem coraz to nowych konstrukcji maksymalizującej wykorzystanie promieniowania słonecznego. Jednym z kierunków jest wysokotemperaturowa konwersja promieniowania na ciepło. Wtedy, z termodynamicznego punktu widzenia otwierają się nam możliwości np. na generację energii elektrycznej. Konwersja wysokotemperaturowa wymaga jednak koncentracji promieniowania słonecznego. Sposobów koncentracji jest wiele, jednak w artykule skupiono się na koncentracji w układzie pole heliostatów- wieża słoneczna. System taki ma szereg zalet w porównaniu do pojedynczych układów koncentrujących, m.in. możliwe jest budowanie pojedynczej elektrowni. Zasadniczym elementem jest tutaj heliostat. Artykuł definiuje pojęcie heliostatu, przedstawia zasadę jego działania oraz przeznaczenie w helioelektrowniach typu wieżowego. Dokonany został podział urządzeń na podgrupy w zależności od technologii w nich zastosowanych. Zaprezentowane zostały poszczególne elementy budowy heliostatów oraz czynniki, które pośrednio lub bezpośrednio wpływają na ich typ, wielkość oraz cenę. Przedstawiono problematykę rentowności przed jaką stoi dziś rynek helioelektrowni oraz stopień istotności jaki stanowi pole heliostatów dla budżetu całej inwestycji. Wymieniono szczegółowe parametry jakie winny spełniać tego typu urządzenia, z wyodrębnieniem trzech grup: wymagania operacyjne, optyczne oraz wytrzymałościowe. Zaprezentowano szczegółowo trzy przykładowe, znacząco różniące co do zasady działania oraz skali, rozwiązania i sparametryzowano je w formie tabelarycznej.

  9. Pain-related fear and functional recovery in sciatica: results from a 2-year observational study

    Directory of Open Access Journals (Sweden)

    Haugen AJ

    2016-10-01

    Full Text Available AJ Haugen,1 L Grøvle,1 JI Brox,2 B Natvig,3 M Grotle4 1Department of Rheumatology, Østfold Hospital Trust, Grålum, 2Department of Physical Medicine and Rehabilitation, Division for Neuroscience, Oslo University Hospital, 3Department of General Practice, Institute of Health and Society, University of Oslo, 4FORMI (Communication Unit for Musculoskeletal Disorders, Division of Neuroscience, Oslo University Hospital, Oslo, Norway Objectives: The purpose of this study was to explore the associations between pain-related fear, pain disability, and self-perceived recovery among patients with sciatica and disk herniation followed up for 2 years.Patients and methods: Pain-related fear was measured by the Tampa Scale for Kinesiophobia (TSK and the Fear-Avoidance Beliefs Questionnaire-Physical Activity (FABQ-PA subscale. Disability was measured by the Maine–Seattle Back Questionnaire. At 2 years, patients reported their sciatica/back problem on a global change scale ranging from completely gone to much worse. No specific interventions regarding pain-related fear were provided.Results: Complete data were obtained for 372 patients. During follow-up, most patients improved. In those who at 2 years were fully recovered (n=66, pain-related fear decreased substantially. In those who did not improve (n=50, pain-related fear remained high. Baseline levels of pain-related fear did not differ significantly between those who were fully recovered and the rest of the cohort. In the total cohort, the correlation coefficients between the 0–2-year change in disability and the changes in the TSK and the FABQ-PA were 0.33 and 0.38, respectively. In the adjusted regression models, the 0–2-year change in pain-related disability explained 15% of the variance in the change in both questionnaires.Conclusion: Pain-related fear decreased substantially in patients who recovered from sciatica and remained high in those who did not improve. Generally, the TSK and the FABQ

  10. Contents of folates in edible mushrooms commercialised in the city of Campinas, São Paulo, Brazil Teor de folatos em cogumelos comestíveis comercializados na cidade de Campinas, São Paulo, Brasil

    Directory of Open Access Journals (Sweden)

    Regina Prado Zanes Furlani

    2007-06-01

    Full Text Available In this study, folates were evaluated in the main species of mushroom cultivated in Brazil. The species analysed were Agaricus bisporus (button mushroom, Lentinula edodes (shiitake and Pleorotus ostreatus (shimeji. The five main forms of folate found in foods were determined: tetrahydrofolic acid (THFA, 10-methyl folic acid (10MFA, 5-methyl tetrahydrofolic acid (5MTHFA, 10-formyl folic acid (10FFA and 5-formy tetrahydrofolic acid (5FTHFA. The methodology employed used extraction with phosphate buffer, clean up with trichloroacetic acid and separation of the vitamins by high-performance liquid chromatography, with simultaneous ultraviolet and fluorescence detection. The results obtained for total folate were 551 to 1404 µg.100 g -1 for the button mushroom, 606 to 727 µg.100 g -1 for shiitake and 460 to 1325 µg.100 g-1 for shimeji. The data showed that mushrooms could be considered as sources of folates and that their contribution of these vitamins to the diet was meaningful.O teor de folatos nas principais espécies de cogumelos cultivados no Brasil foi avaliado neste trabalho. As espécies analisadas foram Agaricus bisporus (champignon de Paris, Lentinula edodes (shiitake e Pleorotus ostreatus (shimeji. Foram determinadas as cinco principais formas de folatos presentes em alimentos: tetrahidro ácido fólico (THAF, 10-metil ácido fólico (10MAF, 5-metil tetrahidro ácido fólico (5MTHAF, 10-formil ácido fólico (10FAF e 5formil tetrahidro ácido fólico (5FTHAF. A metodologia empregada utilizou extração com tampão fosfato, limpeza com ácido tricloroacético e separação das vitaminas por cromatografia líquida de alta eficiência, com detecção em série por fluorescência e ultravioleta. Os resultados obtidos para o total de folatos foram 551 a 1404 µg.100 g -1 para o champignon de Paris, 606 a 727 µg.100 g -1 para o shiitake e 460 a 1325 µg.100 g -1 para o shimeji. Os dados mostram que os cogumelos podem ser considerados fontes

  11. THE SEQUENCE AND DISTRIBUTION OF CRETACEOUS NON-MARINE GASTROPOD ASSEMBLAGES IN CHINA%中国非海相白垩纪腹足类组合序列和分布

    Institute of Scientific and Technical Information of China (English)

    潘华璋

    2012-01-01

    Four assemblages of Cretaceous non-marine gastropodas are recognized in China. These assemblages are: 1) the Probaicalia vitimensis-Ptychostylus-Reesidella robusta (operculum fossil) Assemblage from the Valangin- ian-Barremian Stage; 2) the Bellamya clavilithiformis-Mesocoshliopa cretacea-Zaptychius costatus-Brotiopsis Assem- blage from the Aptian-Albian Stage, which can be divided into two sub-assemlages on the basis of biogeographical differentiation (the Brotiopsis sub-assemblage and the Bellamya clavilithiformis-Mesocoshliopa cretacea-Zaptychius costatus sub-assemblage); 3) the Mesolanistes-nanxion gensis assemblage from the Middle-Upper Maastrichtian-Coniacian Stage, which can also be divided into two sub-assemblages ( the Mesolanistes ziziformis sub-assemblage probably of Coniacian Stage and, the Mesolanistes-nanxiongensis sub-assemblage of the Middle-Upper Maastrichtian-Coniacian age); and 4) the Palaeoancylus nanxiongensis assemblage from the uppermost Maastrichtian Stage.%中国白垩纪非海相腹足类可划分为4个组合:1)早白垩世凡兰吟期-巴列姆期Probaicaliavitimen.sis—Ptychostylus-口盖化石Reesidellarobusta组合;2)早白垩世阿普特期一阿尔必期Bellamyaclavilithi—formis-Mesocoshliopacretacea-Zaptychiuscostatus-Brotiopsis组合,由于环境的不同,这一组合可分为2个亚组合:Brotiopsis亚组合和Bellamyaclavilithiformis-Mesocoshliopacretacea-Zaptychiuscostatus亚组合;3)晚白垩世科尼亚克期一中马斯特里赫特晚期Mesolanistesnanxiongensis组合,由于产出的层位不同,这一组合又可分为2个亚组合Mesolanistes ziziformis亚组合和Mesolanistes—nanxiongensis亚组合;4)晚白垩世马斯特里赫特期最晚期Palaeoancylusnanxiongensi组合。

  12. Study on Particular Coring Bit for Lunar Soil Drilling%月球钻探取心特种钻头研制与试验

    Institute of Scientific and Technical Information of China (English)

    李大佛; 雷艳; 许少宁

    2013-01-01

      对月壤形成过程和物质组成进行了介绍,并将实际月壤基本物理力学指标与CUG-1型模拟月壤和普通干砂进行对比,认为在月球钻探取样过程中可能遇到具有一定胶结强度的硬质团块。为保证钻探取样顺利进行,需要研制月球钻探用特种取心PDC钻头。基于PDC钻头的碎岩机理,对钻头的负前角、旁通角、出露高度、钻头保径和PDC切削齿的钎焊工艺分别进行了设计,并对钻杆和钻头装配体在钻进过程中的受力过程进行有限元分析。最后,采用所设计的特种取心PDC钻头进行岩石干钻试验,试验结果表明,该钻头能钻进可钻性级别小于或等于6级的岩石,能满足月球钻探需要。%Forming process and composition of lunar soil were introduced in this paper, and the actual lunar soil physical and mechanical indexes were compared with and simulated CUG-1 lunar soil and normal dry sand, it was suggested that hard clods with certain cementing strength might be encountered in lunar coring drilling.To ensure the successful lunar co-ring drilling, a special polycrystalline diamond compact (PDC) coring bit should be developed.Based on the breaking rock mechanism of PDC bit, the negative rake angle, bypass angle, exposure height, gauge protection of PDC bit and brazing technologies of PDC cutters were designed respectively;and finite element analysis was made on the force of bit and drill stem assembly during drilling process.At last, the dry drilling test was made by special designed PDC bit, it indicated that the bit would be effective when rock drillability was less than or equal toⅥ, and it could stratify the requirements for lunar soil drilling.

  13. 陕北地区油松根际真菌资源初步调查及其与土壤理化性质的关系%A Survey of Root Fungal Resources of Pinus tabulaeformis and ITS Relationship with Soil Physicochemical Properties in Northern Shaanxi

    Institute of Scientific and Technical Information of China (English)

    杨韧; 张好强; 唐明

    2016-01-01

    为研究陕北不同地区油松(Pinus tabulae formis)根际真菌的资源与分布,以及与土壤理化性质的关系,分别选择陕北神木、府谷、米脂、榆林、安塞、延安6个样地的油松纯林采集样本分离纯化油松根际真菌,经分离鉴定共得到21种、92株真菌.结果表明,神木、府谷、安塞地区的真菌种类较多,榆林、米脂、延安地区的真菌种类相对较少;不同地区土壤理化性质差异显著,同一地区的不同土层差异不显著.菌根侵染率与土壤理化性质的相关性表明,速效氮、速效磷、有机质与菌根侵染率呈正相关;全氮、全磷、全钾在榆林地区与侵染率呈显著正相关;速效钾在延安地区与侵染率呈显著正相关;含水量在府谷地区与侵染率呈显著正相关.此外,研究还发现陕北地区的油松根部真菌资源分布与土壤理化性质的相关性存在差异,其中外生菌根真菌(ectomycorrhizal fungi,EC-MF)与含水量、有机质、速效氮、速效钾的含量呈正相关,与全钾含量呈显著负相关;深色有隔内生菌(dark septate endophytic fungi,DSE)和内生真菌与含水量、有机质、速效氮、速效磷、速效钾呈正相关.因此,菌根侵染率和油松根部真菌资源分布受不同土壤理化性质的影响.

  14. Orientation Response of Chilocorus rubidus Hope to Prey and Host Plant Volatiles%黑缘红瓢虫对几种林果害虫与寄主复合体的行为反应

    Institute of Scientific and Technical Information of China (English)

    杨惠玲

    2009-01-01

    利用Y形嗅觉仪观测了黑缘红瓢虫对几种常见林果健康无虫植株、桃粉大尾蚜和朝鲜球坚蚧虫体自身与分泌物,及植物与蚜虫复合体的定向和选择行为.结果表明:健康无虫的桃树、樱桃李、毛白杨和油松,不产生招引黑缘红瓢虫的挥发性次生物质;桃粉大尾蚜和朝鲜球坚蚧虫体自身与分泌物对黑缘红瓢虫搜索行为亦无显著影响;当寄主植物受到两种害虫为害后,桃树和樱桃李能释放招引黑缘红瓢虫的挥发性物质,而毛白杨和松树在受到蚜虫为害后所释放的挥发物对黑缘红瓢虫无招引作用.结果表明,受害植物的挥发性物质在黑缘红瓢虫搜索猎物中具有重要作用.经长时间不同食物源喂养黑缘红瓢虫,并不影响其搜索行为.%Orientation response of field-collected individuals of the ladybird adults, Chilocorus rubidus Hope, to volatiles from aphid, Hyalopterus amygdale, Chaitophorus populialbae,Cinara pinitabulae-formis, sacle, Didesmococcus koreanus, from aphid or scale-infested plants, and from uninfested plants were tested with Y-tube olfactometer bioassays. Both male and female adults of C. rubidus showed a significant preference for volatiles from H. amygdale or D. koreanus-infested host plants. However, both of them did not response positively to volatiles from H. amygdale, D. koreanus, from uninfested plants, Prunus persica , Prunus ceraifera,Populus tomentosa,Pinus tabulaeformis and from C. populialbae or C. pinitabulaeformis-infested host plants. The results indicate that C. rubidus may use volatiles from prey-infested plants as the olfactory cue for prey location.

  15. Selected Aspects of the Structural Analysis of the North Dome in the 'Four Domes Pavilion'/ Wybrane Aspekty Analizy Konstrukcyjnej Kopuły Północnej W Pawilonie Czterech Kopuł

    Science.gov (United States)

    Jasieńko, Jerzy; Raszczuk, Krzysztof; Moczko, Marta; Piechówka-Mielnik, Magdalena

    2015-06-01

    The subject of the paper is north dome of the Four Domes Pavilion in Wroclaw, which was erected according to the project by architect Hans Poelzig in 1913. The geometry of the dome (plan, rise, thickness) has an essential influence on the stress distribution in the structure and may be a crucial factor determining the cracking pattern. The results of the study of archival documents and numerical analysis indicate that there is a need for increasing the bearing capacity of the structure. After carrying out 3D FEM analysis, it was decided to apply strengthening technology based on the FRCM system with carbon and P.B.O. fibers on the surface and on the external ring of the dome. Powszechnie występującą na całym świecie formą przekryć historycznych jest kopuła, która może być realizowana m.in. na rzucie koła, elipsy czy ośmioboku. Geometria kopuły (rzut, wyniesienie oraz grubość) wpływa na rozkład naprężeń w konstrukcji i może być decydującym czynnikiem wpływającym na propagację rys. Przedmiotem pracy jest Pawilon Czterech Kopuł we Wrocławiu, który powstał wg projektu Hansa Poelziga w 1913r. Analiza dokumentacji archiwalnej wykazuje, iż wszelkie zmiany jakich się podejmowano w trakcie realizacji prac były wynikiem: braku czasu, opóźnień w wykonaniu oceny statycznej, przekazaniu rysunków projektowych w nieodpowiedniej skali oraz prowadzenia prac budowlanych w zimie. Efektem powyższych działań jest niedostateczne zbrojenie kopuły, która uległa uszkodzeniom w formie pęknięć południkowych i równoleżnikowych od strony zewnętrznej i wewnętrznej. W wyniku przeprowadzonej analizy konstrukcyjnej przy użyciu Metody Elementów Skończonych (MES) podjęto decyzję o wzmocnieniu przekrycia przy użyciu siatek z włókien węglowych w systemie FRCM oraz wzmocnienie pierścienia górnego przy użyciu siatek z włókien P.B.O. w matrycy mineralnej.

  16. Homofobia w polskiej kulturze wizualnej jako „nieodkryta” reakcja na przemiany norm seksualnych w Polsce po 1989 roku

    Directory of Open Access Journals (Sweden)

    Paweł Knut

    2017-06-01

    Full Text Available Homophobia in Polish visual culture  as an “undiscovered” response to the transformation  of sexual norms in Poland after 1989 This article discusses the basic characteristics of various artistic practices aimed at stigmatizing nonheterosexuality that occurred in Poland after 1989 in response to a transformation of sexual norms and the rising emancipation of LGBT people. The form and content of selected practices is discussed in detail. Furthermore, the article argues that these practices can be classified as a form of so-called New National Art and signals the maladjustment of the language used by Polish art critique, which foreignizes and pathologizes this kind of art. The author also touches on the phenomenon of deliberate “not discovering” of these practices by national art institutions. Finally, he shows why the absence of artistic practices focused on exclusion and stigmatization of LGBT people seems to be beneficial for both major Polish art institutions and the “excluded” artists.    Homofobia w polskiej kulturze wizualnej jako „nieodkryta” reakcja na przemiany norm seksualnych w Polsce po 1989 roku Artykuł omawia podstawowe cechy praktyk artystycznych piętnujących nieheteroseksualność, które wystąpiły w Polsce po 1989 roku na skutek przemian norm seksualnych i zapoczątkowania procesu emancypacji osób LGBT. Charakteryzuje formy, jakie ta twórczość przyjmuje oraz treści, jakie wyraża. Wskazuje również na zasadność zaklasyfikowania tego rodzaju twórczości jako odmiany tzw. Nowej Sztuki Narodowej. Sygnalizuje problemy związane z używanym przez polską krytykę sztuki języka, który egzotyzuje i patologizuje tego rodzaju twórczość. Odnosi się również do zjawiska zamierzonego „nieodkrywania” tych praktyk artystycznych przez krajowe instytucje sztuki. Wreszcie, wskazuje dlaczego ta celowa nieobecność praktyki artystycznej nakierowanej na wykluczanie i piętnowanie osób LGBT wydaje si

  17. Expression of a constitutively active prolactin receptor causes histone trimethylation of the p53 gene in breast cancer

    Institute of Scientific and Technical Information of China (English)

    Tan Dunyong; Tang Peizhi; Huang Jianjun; Zhang Jie; Zhou Weihua; Ameae M.Walker

    2014-01-01

    plays an important pathogenic role in breast cancer through epigenetic modification.Elevated expression of Delta S2 PRLR,achieved by alternate splicing of the pre-mRNA of the full-length form,is a new mechanism contributing to human breast cancer.

  18. Single crystal XRD, vibrational and quantum chemical calculation of pharmaceutical drug paracetamol: A new synthesis form.

    Science.gov (United States)

    Anitha, R; Gunasekaran, M; Kumar, S Suresh; Athimoolam, S; Sridhar, B

    2015-01-01

    The common house hold pharmaceutical drug, paracetamol (PAR), has been synthesized from 4-chloroaniline as a first ever report. After the synthesis, good quality single crystals were obtained for slow evaporation technique under the room temperature. The crystal and molecular structures were re-determined by the single crystal X-ray diffraction. The vibrational spectral measurements were carried out using FT-IR and FT-Raman spectroscopy in the range of 4000-400 cm(-1). The single crystal X-ray studies shows that the drug crystallized in the monoclinic system polymorph (Form-I). The crystal packing is dominated by N-H⋯O and O-H⋯O classical hydrogen bonds. The ac diagonal of the unit cell features two chain C(7) and C(9) motifs running in the opposite directions. These two chain motifs are cross-linked to each other to form a ring R4(4)(22) motif and a chain C2(2)(6) motif which is running along the a-axis of the unit cell. Along with the classical hydrogen bonds, the methyl group forms a weak C-H⋯O interactions in the crystal packing. It offers the support for molecular assembly especially in the hydrophilic regions. Further, the strength of the hydrogen bonds are studied the shifting of vibrational bands. Geometrical optimizations of the drug molecule were done by the Density Functional Theory (DFT) using the B3LYP function and Hartree-Fock (HF) level with 6-311++G(d,p) basis set. The optimized molecular geometry and computed vibrational spectra are compared with experimental results which show significant agreement. The factor group analysis of the molecule was carried out by the various molecular symmetry, site and factor group species using the standard correlation method. The Natural Bond Orbital (NBO) analysis was carried out to interpret hyperconjugative interaction and intramolecular charge transfer (ICT). The chemical softness, chemical hardness, electro-negativity, chemical potential and electrophilicity index of the molecule were found out first

  19. Co and Cu modified Ni/Al2 O3 steam reforming catalysts for hydrogen production from model bio-oil%Ni/Al2 O3改性催化剂催化重整生物油模拟物制氢研究

    Institute of Scientific and Technical Information of China (English)

    谢登印; 张素平; 陈志远; 陈振奇; 许庆利

    2015-01-01

    制备了 Ni/Al2 O3、Ni-Cu/Al2 O3、Ni -Co/Al2 O3和 Ni -Co-Cu/Al2 O3催化剂,研究了 Co 和 Cu 对生物油水蒸气催化重整的影响。实验表明,Co 能促进水汽变换(WGS)反应,提高氢气的产率,Cu 能抑制反应中焦炭的形成,提高催化剂的稳定性。对催化剂 Ni-Co-Cu/Al2 O3进行工艺条件考察,当900℃、水油比为6 g/g、质量空速(WHSV)为1 h-1时,碳选择性达到87.5%,氢气产率达到84.2%,潜在氢气产率达到92.4%。%Ni/Al2 O3 cat aly st was selected as the reference catalyst for steam reformi ng of mo del bio-oil to produce hydrog en.Ni-Cu/Al2 O3 , Ni-Co/Al2 O3 and Ni-Co-Cu /Al2 O3 were prepared to investigate the influence of Co and Ni on steam reforming of bio-oil.The results show that Co can enhance the water gas shift (WGS) reaction rate, and Cu can prevent the formation of coke.The reaction conditions for the steam re formi ng of bio-oil with the Ni-Co-Cu/Al2 O3 catalyst were optimized as the follows: te mper ature of900 ℃, wat er-oil ratio (the mass ratio of steam to oil) of 6 g/g and weight hourly space velocity (WHSV) of 1 h-1 .The carbon selectivity of 87.5%, hydrogen yield of 84.2% and potential hydrogen yield of 92.4% can be obtained at the optimum conditions.

  20. Między pamięcią a zapomnieniem Shoah. Problem estetycznej neutralizacji przeszłości w myśleniu historycznym Saula Friedländera

    Directory of Open Access Journals (Sweden)

    Sawicki, Maciej

    2015-06-01

    Full Text Available W tekstach Saula Friedländera problem indywidualnej pamięci Shoahstanowił jedną z głównych granic dla dyskursu. Punktem krytycznym jego refleksji nad pamięcią stała się kwestia społecznego myślenia zbawczego, które stanowiło reakcję obronną wobec katastrofy. Fenomen ten ujawnił się szczególnie wyraźnie w publicznej formie pamięci, która z jednej strony domagała się prostoty i jasnej interpretacji, jako że jej zadaniem było oswojenie niekoherencji, wyeliminowanie bólu oraz rozbudzenie nadziei u współczesnych; z drugiej strony indywidualna pamięć głęboka ocalałych – nie znająca zasad – nie godziła się na formę pamięci publicznej, mimo że nie była w stanie jej się oprzeć. Według Friedländera ekspansja pamięci publicznej i zanikanie pamięci indywidualnej sprawia, iż "pamięć Shoah prawdopodobnie nie ucieknie przed całkowitą rytualizacją"1. W swoich rozważaniach częstokroć zwracał on uwagę na to, że sztuka nie może przeciwdziałać oswajaniu grozy, ponieważ musi wyrażać indywidualną pamięć przeszłości w pewnych prostych formach. Oprócz tego problematyczny stał się fakt, że same kategorie sztuki po Holokauście zostały zawładnięte przez przemysł kulturowy i politykę, przez co problem pamięci stał się środkiem przetargowym dla innych celów. Nawiązując za Friedländerem do aktualnego impasu wobec różnych oswajających mechanizmów pamięci, spróbuję poddać pod rozwagę kwestię granic i możliwości w tworzeniu estetycznego pomostu między teraźniejszością a przeszłością.

  1. Miejsce pamięci – pomnik – anty-pomnik. Artystyczne strategie upamiętniania na terenie krakowskiego Podgórza

    Directory of Open Access Journals (Sweden)

    Szymański, Wojciech

    2015-06-01

    Full Text Available Krakowska dzielnica Podgórze w ostatnich latach doczekała się w przestrzeni publicznej kilku realizacji,które odnoszą się do pamięci miejsca. Do monumentlanego, wzniesionego w latach sześćdziesiątych przez Witolda Cęckiewicza pomnika z terenu Obozu Płaszów dołączyły realizacje współczesne. Zwłaszcza Plac Bohaterów Getta i jego bezpośrednie sąsiedztwo stały się tematem dla artystów i projektantów, którzy wykonali tutaj realizacje związane dyskursywnie z paradygmatem anty-monumentalizmu i post-pamięci (Puryfikacja Mateusza Okońskiego, 10 metrów sześciennych zimowego powietrza Krakowa Łukasza Skąpskiego, aranżacja placu w formie krzeseł autorstwa pracowni Lewicki i Łatak. Realizacje te często postronnym widzom i przypadkowym przechodniom, a nawet mieszkańcom dzielnicy niewiele mówią o historii i wydarzeniach, które w zamyśle autorów mają upamiętniać. Czy, lokując się świadomie na granicy widzialnego, to jest na granicy tego, co postrzegane jest jako sztuka, prace te spełniają swoje kommemoratywne założenie? Czy nadmiar niewidzialnego zamieni się kiedyś w widzialne? Te pytania są punktem wyjścia nie tylko do przedstawienia wyżej wymienionych realizacji na tle analogicznych działań w sztuce współczesnej ostatnich dwóch dekad, lecz także do zarysowania szerszej refleksji o monumentalnym i anty-monumentalnym upamiętnianiu w sztuce po Zagładzie.

  2. Identification of endoparasites in rats of various habitats

    Directory of Open Access Journals (Sweden)

    Dwi Priyanto

    2014-08-01

    Full Text Available AbstrakLatar belakang: Tikus merupakan hewan yang habitatnya berdekatan dengan lingkungan manusia. Keberadaannya merupakan faktor resiko penularan beberapa jenis penyakit zoonosis. Penelitian ini bertujuan untuk mengetahui jenis tikus di habitat pemukiman, kebun, sawah, dan pasar di Kabupaten Banjarnegara, serta mengidentifikasi zoonotik endoparasit yang terdapat pada organ hati, lambung, usus dan sekum tikus.Metode: Penangkapan tikus dilakukan di 3 kecamatan selama Juli - Oktober 2012. Observasi endoparasit dilakukan pada organ hati dan saluran pencernaan yang meliputi lambung, usus dan sekum. Analisis data secara deskriptif dengan menggambarkan spesies tikus dan endoparasit yang didapat.Hasil: Spesies tikus yang tertangkap dalam penelitian ini adalah Rattus tanezumi, Rattus exulans, Rattus tiomanicus, Rattus argentiventer, Rattus norvegicus dan Suncus murinus. Spesies endoparasit yang menginfeksi hati tikus adalah Capillaria hepatica dan Cystycercus Taenia taeniaeformis. Endoparasit yang menginfeksi organ lambung tikus adalah Masthoporus sp. dan Gongylonema neoplasticum. Nippostrongylus brassilliensis, Hymenolepis diminuta, Hymenolepis nana, Monili formis sp. dan Echinostoma sp. ditemukan menginfeksi organ usus tikus, sedangkan Syphacia muris ditemukan menginfeksi organ sekum. Tidak ditemukan jenis endoparasit yang menginfeksi lebih dari satu jenis organ tikus.Kesimpulan: Endoparasit tikus yang bersifat zoonosis dalam penelitian ini adalah Capillaria hepatica, Gongylonema neoplasticum, Hymenolepis diminuta, Hymenolepis nana dan Syphacia muris. Tiap jenis endoparasit menginfeksi organ yang spesifik pada tikus. (Health Science Indones 2014;1:49-53Kata kunci:tikus, endoparasit, zoonosis.AbstractBackground: Rat is an animal living around people. It is a risk factor for several types of zoonotic diseases. The aims of this study were to determine the rat species from various habitats including houses, gardens, rice fields, and traditional market

  3. Investigation of zinc alkali pyrophosphate glasses. Part II: Local and medium range orders analysed by 1D/2D NMR

    Energy Technology Data Exchange (ETDEWEB)

    Rajbhandari, P. [UCCS UMR-CNRS 8181, Université de Lille1, Villeneuve d' Ascq (France); Chen, Y. [LASIR UMR-CNRS 8516, Université de Lille1, Villeneuve d' Ascq (France); Doumert, B. [IMMCL CNRS-FR2638, Université de Lille1, Villeneuve d' Ascq (France); Montagne, L. [UCCS UMR-CNRS 8181, Université de Lille1, Villeneuve d' Ascq (France); Tricot, G., E-mail: gregory.tricot@univ-lille1.fr [UCCS UMR-CNRS 8181, Université de Lille1, Villeneuve d' Ascq (France); LASIR UMR-CNRS 8516, Université de Lille1, Villeneuve d' Ascq (France)

    2015-04-01

    The structure of the (66-x)ZnO-xNa{sub 2}O-33.4P{sub 2}O{sub 5} composition line, selected for the development of low-Tg and stable glasses, has been investigated by 1D/2D NMR spectroscopy. If standard 1D {sup 31}P MAS-NMR experiments give access to the Q{sup n} speciation and show the presence of Q{sup 0}, Q{sup 1} and Q{sup 2} sites within the glass structure, application of the homonuclear through-space correlation technique ({sup 31}P DQ-SQ) allows for a more accurate description of the phosphate units. Clear distinction between the Q{sup 1} sites involved in dimmers or in longer chains has been derived from 2D NMR correlation maps and leads to the re-assignment of Q{sup 1} into Q{sup 1,1} and Q{sup 1,2} species. {sup 23}Na and {sup 23}Na({sup 31}P) REDOR MAS-NMR experiments have been used to analyse the Na{sup +} ions distribution and its interaction with the phosphate network. {sup 67}Zn static NMR experiments, performed at very high field, were carried out and suggest a constant Zn{sup 2+} coordination state all along the composition line. The results have been used to discuss the impact of the Zn{sup 2+}/Na{sup +} ratio on the extent of disorder within the glass network expressed in terms of Q{sup n} dismutation equilibrium constant and phosphate chain length distribution. - Highlights: • Structure of zinc alkali pyrophosphate glasses have been analysed by 1D/2D NMR. • 2D {sup 31}P experiments allow to separate Q{sup 1,1} and Q{sup 1,2} species. • {sup 67}Zn static NMR shows a constant signal all along the composition line.

  4. Hyperine transitions rates and capture rates in muonic F, Na, and Cl

    Energy Technology Data Exchange (ETDEWEB)

    Gorringe, T.P.; Johnson, B. Bauer, J. [and others

    1993-04-01

    From the time spectrum of {gamma}-rays following muon capture the authors have measured hyperfine transitions rates on muonic F, Na, and Cl, and the hyperfine dependence of the reaction {mu}{sup {minus}} {sup 23}Na(3/2{sup +},0) {r_arrow} {nu}{sup 23}Ne({1/2}{sup +},1017). They obtained hyperfine transition rates of 4.9{+-}1.2 {mu}s{sup {minus}1}, 8.4{+-}1.9 {mu}s{sup {minus}1}, and 6.5{+-}0.9 {mu}s{sup {minus}1}, for muonic F, Na, and Cl, respectively. The pattern of rates is in agreement with the calculations of Winston which indicate a general increase in rate with atomic number but a decrease at Cl where the emission of L shell electrons becomes forbidden. However, the authors` measured rates are systematically lower than the calculations of Winston (by 15 to 40 %), perhaps due to incomplete refilling of the muonic atom`s electron shells after formation. The hyperfine dependence of the reaction {mu}{sup {minus}} {sup 23}Na (3/2{sup +},0) {r_arrow} {nu} {sup 23}Ne({1/2}{sup +},1017) is dependent on the weak pseudoscalar coupling (g{sub p}) of the proton, and in an initial measurement at the TRIUMF laboratory gave a hyperfine dependence, {Lambda}{sub +}/{Lambda}{sub {minus}} = 0.18 {+-} 0.10, and a weak pseudoscalar coupling 5 {le} g{sub p}/g{sub e} {le} 15. A more recent measurement will determine g{sub p} to about 10 %, and will probe modifications of the coupling in the nuclear medium.

  5. A double-quadrature radiofrequency coil design for proton-decoupled carbon-13 magnetic resonance spectroscopy in humans at 7T.

    Science.gov (United States)

    Serés Roig, Eulalia; Magill, Arthur W; Donati, Guillaume; Meyerspeer, Martin; Xin, Lijing; Ipek, Ozlem; Gruetter, Rolf

    2015-02-01

    Carbon-13 magnetic resonance spectroscopy ((13) C-MRS) is challenging because of the inherent low sensitivity of (13) C detection and the need for radiofrequency transmission at the (1) H frequency while receiving the (13) C signal, the latter requiring electrical decoupling of the (13) C and (1) H radiofrequency channels. In this study, we added traps to the (13) C coil to construct a quadrature-(13) C/quadrature-(1) H surface coil, with sufficient isolation between channels to allow simultaneous operation at both frequencies without compromise in coil performance. Isolation between channels was evaluated on the bench by measuring all coupling parameters. The quadrature mode of the quadrature-(13) C coil was assessed using in vitro (23) Na gradient echo images. The signal-to-noise ratio (SNR) was measured on the glycogen and glucose resonances by (13) C-MRS in vitro, compared with that obtained with a linear-(13) C/quadrature-(1) H coil, and validated by (13) C-MRS in vivo in the human calf at 7T. Isolation between channels was better than -30 dB. The (23) Na gradient echo images indicate a region where the field is strongly circularly polarized. The quadrature coil provided an SNR enhancement over a linear coil of 1.4, in vitro and in vivo. It is feasible to construct a double-quadrature (13) C-(1) H surface coil for proton decoupled sensitivity enhanced (13) C-NMR spectroscopy in humans at 7T. © 2014 Wiley Periodicals, Inc.

  6. The Effect of Alkaline and Polymer Additives on Phase Behaviour of Surfactant-Oil-Brine System At High Salinity Conditions Effet des additifs alcalins et polymères sur le comportement des phases d'un système tensioactif-pétrole-saumure dans des conditions de forte salinité

    Directory of Open Access Journals (Sweden)

    Sayyouh M. H.

    2006-11-01

    Full Text Available This paper deals with the effect of alkali and polymer on the phase behavior of some available surfactants (Petrostep HMW - Safaniya crude oil-brine system and the phase relations were obtained after equilibrium at 25 and 70°C. It was found that the miscibility increases when using NaOH and with increasing concentration from 0. 5 to 1. 0% for reservoir salinity of 23% NaCl. Increasing NaCl concentration from 3. 84 to 23% decreases the system miscibility. Temperature increase and using of isopropyl alcohol decreases miscibility. Presence of polymer improves the miscibility on the water-rich side and decreases the miscibility on the oil-rich side. Cet article traite des effets des alcalis et des polymères sur l'équilibre des phases de certains systèmes disponibles combinant tensioactifs (Petrostep HMW, brut de Safaniya et saumure, et des rapports de phase obtenus après mise en équilibre à 25 et 70°C. On a constaté que la miscibilité augmente en cas d'utilisation de NaOH et avec une concentration croissante de 0,5 à 1,0 % pour une salinité du réservoir de 23 % NaCI. L'augmentation de la concentration de NaCI, de 3,84 à 23%, diminue la miscibilité du système. L'augmentation de la température et l'utilisation d'alcool isopropylique diminuent la miscibilité. La présence de polymère améliore la miscibilité pour la phase riche en eau et la diminue pour la phase riche en pétrole.

  7. Investigation of brain injury using in vivo multinuclear magnetic resonance imaging and spectroscopy

    Energy Technology Data Exchange (ETDEWEB)

    Chew, W.M.

    1989-01-01

    Magnetic Resonance Imaging (MRI) and Spectroscopy (MRS) are becoming increasingly important tools to the fields of biochemistry, physiology, and medicine. MRI and MRS studies offer one the opportunity to obtain anatomic images and biochemical information non-invasively and non-destructively, thus making serial repeated measurements possible on the same experimental subject. To investigate brain injury, the non-invasiveness finally allows one to follow the time course of evolution of injury and its effects on the brains metabolism. Although MRI and MRS offer exciting opportunities, much work is needed to overcome the initial problems of signal localization from a specified region of interest. Also, the potential utility of multinuclear (i.e. {sup 13}C, {sup 19}F, {sup 23}Na...) MRI and MRS studies, in assessing brain injury, is yet to be determined. This thesis attacks the aforementioned problems with a series of studies both on phantoms and in vivo. Experiments were performed to determine optimal localization schemes for use in MRS of the brain to overcome the initial problems encountered with MRS studies. The feasibility and utility of multinuclear MRI and MRS was determined in vivo involving {sup 13}C, {sup 19}F, and {sup 23}Na nuclei. The results of these studies have proven that acceptable signal localization for MRS studies is achievable and is not a hindrance for future MRS studies. Also, multinuclear studies have shown that it is feasible to obtain MRI or MRS data from less abundant nuclei and that the information obtained does or can provide useful insights into brain metabolism in pathologic states.

  8. Oxygen-17 NMR in solids by dynamic-angle spinning and double rotation

    Science.gov (United States)

    Chmelka, B. F.; Mueller, K. T.; Pines, A.; Stebbins, J.; Wu, Y.; Zwanziger, J. W.

    1989-05-01

    IT is widely lamented that despite its unqualified success with spin-1/2 nuclei such as 13C, 29Si and31P, the popular NMR technique of magic-angle spinning (MAS) has experienced a somewhat restricted applicability among quadrupolar nuclei such as 17O, 23Na and 27A1 (refs 1-3). The resolution in the central (1/2 lrarr-1/2) transition of these non-integer quadrupolar spins under MAS is thought to be limited primarily by second-order quadrupolar broadening. Such effects of second-order spatial anisotropy cannot be eliminated by rotation about a fixed axis or by multiple-pulse techniques4,5. More general mechanisms of sample reorientation (refs 6-8 and A. Samoson and A. Pines, manuscript in preparation) can, however, make high-resolution NMR of quadrupolar nuclei feasible. MAS is implemented by spinning a sample about a single axis so that second-rank spherical harmonics (which give rise to first-order broadening through anisotropy of electrical and magnetic interactions) are averaged away. But dynamic-angle-spinning (DAS) and double-rotation (DOR) NMR involve spinning around two axes, averaging away both the second- and fourth-rank spherical harmonics, which are responsible for second-order broadening. Here we present the application of these new techniques to 17O in two minerals, cristobalite (SiO2) and diopside (CaMgSi2O6). This work goes beyond previous results on 23Na (ref. 8) by showing the first experimental results using DAS and by demonstrating the application of DOR to the resolution of distinct oxygen sites in an important class of oxide materials.

  9. Słownictwo kulinarne w chorwackich przysłowiach, porzekadłach, frazeologizmach, przyśpiewkach, formach żargonalnych i ludowych

    Directory of Open Access Journals (Sweden)

    Adrianna Słabińska

    2016-12-01

    ą ludzie biesiadujący przy stole. Rozmawiając o różnych codziennych sprawach, mówią też o jedzeniu – chwalą, narzekają czy krytykują. Spożywanie posiłków w gronie rodziny, przyjaciół, zarówno w sytuacji codziennej, jak i uroczystej, tworzy specjalny nastrój. Nadarza się okazja do zwierzeń, porad, żartów, wspomnień i życiowych refleksji. Powstają różne powiedzenia, przysłowia, które wzbogacają kulturę danego kraju czy regionu. Nie inaczej jest w Chorwacji. W języku chorwackim istnieje wiele przysłów i porzekadeł związanych z lokalnymi tradycjami kulinarnymi. Część z nich jest powszechnie znana w całym kraju, niektóre tylko na wybranych obszarach. W całej Chorwacji znane są liczne przysłowia w formie nieco zmienionej w warstwie obrazowej. Zaprezentowane w niniejszym artykule przysłowia i porzekadła zaczerpnęłam ze zbioru Josipa Kekeza, uznanego paremiologa chorwackiego. Należy wziąć pod uwagę, iż jest to materiał wybrany, a w słownikach internetowych notowane są jeszcze inne formacje, których nie będę tu omawiać. Obok form chorwackich podaję w nawiasach polski ekwiwalent w tłumaczeniu własnym, oddający sens całej konstrukcji. W dalszej części opisuję przysłowia regionalne oraz przyśpiewki, które ilustrują różnorodność dialektów chorwackich. Przytaczam także obecne w chorwackiej leksyce kulinarnej inne formy językowe, jak żargonizmy i elementy zaczerpnięte z innych języków, aby ukazać jej niezwykłą różnorodność i bogactwo.

  10. Przychody z tytułu dotacji unijnychw sprawozdaniu finansowymprzedsiębiorstwa

    Directory of Open Access Journals (Sweden)

    Marzena Wrona

    2010-03-01

    Full Text Available Celem niniejszej publikacji jest przedstawienie sposobów ujęcia w księgach ra-chunkowych i prezentacji w sprawozdaniu finansowym przedsiębiorstw przychodów z tytułu dotacji unijnych. Od wejścia Polski do UE podmioty gospodarcze otrzymały możliwość korzystania z pomocy unijnej w formie dotacji na niespotykaną dotych-czas skalę. Spowodowało to również wiele problemów, w szczególności prawidłowe-go ujęcia w księgach rachunkowych, oraz w sprawozdaniu finansowym – przycho-dów z tytułu dotacji. Stąd też narodził się pomysł przedstawienia głównych zasad ujmowania i prezentacji w księgach rachunkowych i sprawozdaniu finansowym dotacji, jako źródła uzyskiwanego przychodu przez podmioty gospodarcze. W artykule wykorzystano analizę literatury przedmiotu, zapisy ustawy o ra-chunkowości i Międzynarodowych Standardów Rachunkowości oraz dokumentację programów wsparcia ze środków unijnych, a także uregulowania unijne, co umoż-liwiło zaproponowanie rozwiązań w zakresie ujęcia dotacji w sprawozdaniu finan-sowym. Artykuł podzielono na 4 główne punkty. W pierwszej części wprowadzono czy-telnika do funduszy unijnych w okresie programowym 2007–2013, przedstawiając główne instrumenty polityki strukturalnej Unii Europejskiej, podział tych instru-mentów na programy operacyjne w okresie 2007–2013 oraz cele, na które można otrzymać dofinansowanie. W drugiej części artykułu zaprezentowano zasady ujęcia dotacji w sprawozdaniu finansowym, w myśl przepisów ustawy o rachunkowości i MSR. Zgodnie z MSR 20 przedstawiono podejście kapitałowe oraz przychodowe do dotacji rządowych, a także prezentację dotacji w sprawozdaniu finansowym w po-dziale na dotacje do aktywów oraz do przychodów. W części trzeciej artykułu przed-stawiono dotacje do aktywów na przykładzie dotacji inwestycyjnych oraz na bada-nia i rozwój, ze szczególnym wskazaniem w każdym z przykładów zasad ujmowa-nia ich w

  11. Effect analysis of Bacillus subtilis two (Live) enteric-coated capsules combined with Bacillus licheniformis capsule in the treatment of antibiotic associated diarrhea%枯草杆菌二联活菌肠溶胶囊联合地衣芽胞杆菌活菌胶囊治疗老年抗生素相关性腹泻的效果分析

    Institute of Scientific and Technical Information of China (English)

    袁宏伟

    2015-01-01

    Objective To explore the clinical effect of Bacillus subtilis two (Live) enteric-coated capsules combined with Bacillus licheniformis capsule in the treatment of antibiotic associated diarrhea. Methods 120 patients with an-tibiotic associated diarrhea in our hospital from February 2013 to February 2014 were selected,and were divided into three groups based on random number table,Bacillus subtilis two (Live) enteric-coated capsules group,Bacillus licheni-formis capsule group,and joint application of Bacillus subtilis two (Live) enteric-coated capsules and Bacillus licheni-formis capsule group.The therapeutic effects among three groups were compared. Results The cure rate of joint applica-tion of Bacillus subtilis two (Live) enteric-coated capsules and Bacillus licheniformis capsule group was higher than that of Bacillus subtilis two (Live) enteric-coated capsules group and Bacillus licheniformis capsule group,the differ-ence was significant (χ2=8.26,P=0.02).The number of diarrhea in healed patients of joint application of Bacillus subtilis two (Live) enteric-coated capsules and Bacillus licheniformis capsule group was less than that of Bacillus subtilis two (Live) enteric-coated capsules group and Bacillus licheniformis capsule group,the difference was significant (F=91.03, P=0.00). Conclusion Both Bacillus subtilis two (Live) enteric-coated capsules and Bacillus licheniformis capsule are classified into probiotics,and have some effect on treating senile associated diarrhea caused by antibiotics.Joint applica-tion of the two drugs displays remarkable effect on treating antibiotic associated diarrhea,and plays a certain assistant role in clinical treatment.%目的:探讨枯草杆菌二联活菌肠溶胶囊联合地衣芽胞杆菌活菌胶囊对老年抗生素相关性腹泻的临床疗效。方法收集2013年2月~2014年2月本院老年抗生素相关性腹泻患者120例,根据随机数字表法分为枯草杆菌二联活菌肠溶胶囊组、地衣芽胞杆

  12. Microcrystalline hexagonal tungsten bronze. 1. Basis of ion exchange selectivity for cesium and strontium.

    Science.gov (United States)

    Griffith, Christopher S; Luca, Vittorio; Hanna, John V; Pike, Kevin J; Smith, Mark E; Thorogood, Gordon S

    2009-07-06

    The structural basis of selectivity for cesium and strontium of microcrystalline hexagonal tungsten bronze (HTB) phase Na(x)WO(3+x/2).zH(2)O has been studied using X-ray and neutron diffraction techniques, 1D and 2D (23)Na magic angle spinning (MAS) nuclear magnetic resonance (NMR) spectroscopy, and radiochemical ion exchange investigations. For the HTB system, this study has shown that scattering techniques alone provide an incomplete description of the disorder and rapid exchange of water (with tunnel cations) occurring in this system. However, 1D and 2D (23)Na MAS NMR has identified three sodium species within the HTB tunnels-species A, which is located at the center of the hexagonal window and is devoid of coordinated water, and species B and C, which are the di- and monohydrated variants, respectively, of species A. Although species B accords with the traditional crystallographic model of the HTB phase, this work is the first to propose and identify the anhydrous species A and monohydrate species C. The population (total) of species B and C decreases in comparison to that of species A with increasing exchange of either cesium or strontium; that is, species B and C appear more exchangeable than species A. Moreover, a significant proportion of tunnel water is redistributed by these cations. Multiple ion exchange investigations with radiotracers (137)Cs and (85)Sr have shown that for strontium there is a definite advantage in ensuring that any easily exchanged sodium is removed from the HTB tunnels prior to exchange. The decrease in selectivity (wrt cesium) is most probably due to the slightly smaller effective size of Sr(2+); namely, it is less of a good fit for the hexagonal window, ion exchange site. The selectivity of the HTB framework for cesium has been shown unequivocally to be defined by the structure of the hexagonal window, ion exchange site. Compromising the geometry of this window even in the slightest way by either (1) varying the cell volume through

  13. Microcrystalline hexagonal tungsten bronze. 2. Dehydration dynamics.

    Science.gov (United States)

    Luca, Vittorio; Griffith, Christopher S; Hanna, John V

    2009-07-06

    Low-temperature (25-600 degrees C) thermal transformations have been studied for hydrothermally prepared, microcrystalline hexagonal tungsten bronze (HTB) phases A(x)WO(3+x/2).zH(2)O as a function of temperature, where A is an exchangeable cation (in this case Na(+) or Cs(+)) located in hexagonal structural tunnels. Thermal treatment of the as-prepared sodium- and cesium-exchanged phases in air were monitored using a conventional laboratory-based X-ray diffractometer, while thermal transformations in vacuum were studied using synchrotron X-ray and neutron diffraction. Concurrent thermogravimetric, diffuse reflectance infrared (DRIFT), and (23)Na and (133)Cs magic angle spinning (MAS) NMR spectroscopic studies have also been undertaken. For the cesium variant, cell volume contraction occurred from room temperature to about 350 degrees C, the regime in which water was "squeezed" out of tunnel sites. This was followed by a lattice expansion in the 350-600 degrees C temperature range. Over the entire temperature range, a net thermal contraction was observed, and this was the result of an anisotropic change in the cell dimensions which included a shortening of the A-O2 bond length. These changes explain why Cs(+) ions are locked into tunnel positions at temperatures as low as 400 degrees C, subsequently inducing a significant reduction in Cs(+) extractability under low pH (nitric acid) conditions. The changing Cs(+) speciation as detected by (133)Cs MAS NMR showed a condensation from multiple Cs sites, presumably associated with differing modes of Cs(+) hydration in the tunnels, to a single Cs(+) environment upon thermal transformation and water removal. While similar lattice contraction was observed for the as-prepared sodium variant, the smaller radius of Na(+) caused it to be relatively easily removed with acid in comparison to the Cs(+) variant. From (23)Na MAS NMR studies of the parent material, complex Na(+) speciation was observed with dehydrated and various

  14. Wave-packet dynamics in alkaline dimers. Investigation and control through coherent excitation with fs-pulses; Wellenpaketdynamik in Alkali-Dimeren. Untersuchung und Steuerung durch kohaerente Anregung mit fs-Pulsen

    Energy Technology Data Exchange (ETDEWEB)

    Sauer, F.N.B.

    2007-07-01

    During my PhD thesis I investigated alkaline dimers with coherent control in a molecular beam as well as with pump-probe spectroscopy in a magneto-optical trap (MOT). The aim of the coherent control experiments were the isotope selective ionization with phase- and amplitude-shaped fs-pulses. Chapter 4 described the gained results of isotope selective ionization of NaK and KRb in a molecular beam by using different pulse formers. For the NaK dimer was the reached optimization factor R{sub Ph} and {sub Ampl}{sup 770}=R{sub max}/R{sub min}=25 between maximization and minimization of the isotopomer ratio ({sup 23}Na{sup 39}K){sup +}/({sup 23}Na{sup 41}K){sup +} with phase and amplitude modulation of the fs-pulse with a central wavelength of {lambda}=770 nm. From the electronic ground-state X(1){sup 1}{sigma}{sup +};{nu}''=0 transfers a one-photon-excitation population in the first excited A(2) {sup 1}{sigma}{sup +} state. The coherent control experiment on KRb was used to maximize and minimize the isotopomer ratio ({sup 124}KRb){sup +}/({sup 126}KRb){sup +}. It was the first coherent control experiment with a spectral resolution of 1.84 cm{sup -1}/Pixel. For the phase and amplitude optimization was the received optimization factor between minimization and maximization of the isotopomer ratio R{sub Ph} and {sub Ampl}=R{sub max}/R{sub min}=7 at a central wavelength of 840 nm. The results showed a stepwise excitation process from the electronic ground-state in the first excited (2){sup 1}{sigma}{sup +} state with a further excitation, that is possible over three resonant energy potential curves into the ionic ground-state. In the second part of my thesis I realized pump-probe spectroscopy of Rb{sub 2} dimers in a dark SPOT. (orig.)

  15. In situ synthesis studies of silicon clathrates

    Science.gov (United States)

    Hutchins, Peter Thomas

    Solid state clathrates have shown considerable potential as a new class of materials over the past 30 years. Experimental and theoretical studies have shown that precise tuning and synthetic control of these materials, may lead to desirable properties. Very little is known about the mechanism of formation of the clathrates and so the desire to have accurate synthetic control was, until now, unrealistic. This thesis address the problem using in situ synchrotron x-ray techniques. In this study, experiments were designed to utilise time-resolved in situ diffraction techniques and high temperature 23Na NMR, in efforts to understand the mechanism of formation for this class of expanded framework materials. A complex high vacuum capillary synthesis cell was designed for loading under inert conditions and operation under high vacuum at station 6.2 of the SRS Daresbury. The cell was designed to operate in conjunction with a custom made furnace capable of temperatures in excess of 1000 C, as well as a vacuum system capable of 10"5 bar. The clathrate system was studied in situ, using rapid data collection to elucidate the mechanism of formation. The data were analysed using Rietveld methods and showed a structural link between the monoclinic, C2/c, Zintl precursors and the cubic, Pm3n, clathrate I phase. The phases were found to be linked by relation of the sodium planes in the silicide and the sodium atoms resident at cages centres in the clathrate system. This evidence suggests the guest species is instrumental in formation of the clathrate structure by templating the formation of the cages in the structure. Solid state 23Na NMR was utilised to complete specially design experiments, similar to those complete in situ using synchrotron x-ray techniques. The experiments showed increased spherical symmetry of the alkali metal sites and suggested increased mobility of the guest atoms during heating. In addition, cyclic heating experiments using in situ diffraction showed

  16. Integrated Ion Beam Analysis (IBA) in Gunshot Residue (GSR) characterisation.

    Science.gov (United States)

    Romolo, F S; Christopher, M E; Donghi, M; Ripani, L; Jeynes, C; Webb, R P; Ward, N I; Kirkby, K J; Bailey, M J

    2013-09-10

    Gunshot Residue (GSR) is residual material from the discharge of a firearm, which frequently provides crucial information in criminal investigations. Changes in ammunition manufacturing are gradually phasing out the heavy metals on which current forensic GSR analysis is based, and the latest Heavy Metal Free (HMF) primers urgently demand new forensic solutions. Proton scanning microbeam Ion Beam Analysis (IBA), in conjunction with the Scanning Electron Microscope equipped with an Energy Dispersive X-ray Spectrometer (SEM-EDS), can be introduced into forensic analysis to solve both new and old problems, with a procedure entirely commensurate with current forensic practice. Six cartridges producing GSR particles known to be interesting in casework by both experience and the literature were selected for this study. A standard procedure to relocate the same particles previously analysed by SEM-EDS, based on both secondary electron (SE) and X-ray imaging was developed and tested. Elemental Particle Induced X-ray Emission (PIXE) mapping of the emitted X-rays allowed relocation in a scan of 10 μm × 10 μm of even a 1 μm GSR particle. The comparison between spectra from the same particle obtained by SEM-EDS and IBA-PIXE showed that the latter is much more sensitive at mid-high energies. Results that are very interesting in a forensic context were obtained with particles from a cartridge containing mercury fulminate in the primer. Particle-induced gamma-ray emission (PIGE) maps of a particles from HMF cartridges allowed identification of Boron and Sodium in particles from hands using the (10)B(p,α1γ)(7)Be, (11)B(p,p1γ)(11)B and (23)Na(p,p1γ)(23)Na reactions, which is extraordinary in a forensic context. The capability for quantitative analysis of elements within individual particles by IBA was also demonstrated, giving the opportunity to begin a new chapter in the research on GSR particles. The integrated procedure that was developed, which makes use of all the IBA

  17. Pion absorption in nuclei: The (. pi. /sup + -/,p) reactions

    Energy Technology Data Exchange (ETDEWEB)

    Mishra, C.S.

    1987-05-01

    Reported here is the first experiment to measure the excitation of discrete final states following the (..pi../sup -/,p) reaction. The Energetic Pion Channel and Spectrometer (EPICS) at the Los Alamos National Laboratory and the High Resolution Pion Channel and Spectrometer (..pi..M1-SUSI) at the Swiss Institute for Nuclear Physics were used for this high resolution study of (..pi../sup + -/,p) reactions. An average energy resolution of 500 KeV and 700 KeV was achieved at EPICS and ..pi..M1-SUSI respectively. At EPICS these reactions were measured at T/sub ..pi../ = 120 MeV and theta/sub lab/ = 25/sup 0/ on /sup 24/Mg, /sup 27/Al, /sup 40/Ca and /sup 58/Ni; /sup 12/C(..pi../sup -/,p) was measured at T/sub ..pi../ = 145 MeV. At ..pi..M1-SUSI these reactions were measured at T/sub ..pi../ = 90 MeV and at theta/sub lab/ = 20/sup 0/ on /sup 23/Na and /sup 24/Mg. The measurement includes both the differential cross sections and continuum up to an excitation energy of 40 MeV. In /sup 23/Na, /sup 24/Mg, and /sup 27/Al there are peaks in the low excitation region. The shape of the continuum in an excitation energy range of 10 to 40 MeV was found to be independent of pion charge and target mass. The magnitude of proton yield from all the targets at T/sub ..pi../ = 120 MeV is more than twenty four times larger for ..pi../sup +/ than for ..pi../sup -/. Also, the cross sections for both reactions on /sup 24/Mg is slightly enhanced compared to other nuclei. At T/sub ..pi../ = 90 MeV the ratio of the proton yield for ..pi../sup +/ to ..pi../sup -/ absorption drops down to fourteen. This high ratio and its energy dependence supports the idea of a two nucleon pion absorption model. Pion absorption in the context of both the reaction mechanism and nuclear structure is discussed. 99 refs., 64 figs., 11 tabs.

  18. NMR and Nqr Study of Atomic Order in Alkali Borate Glasses.

    Science.gov (United States)

    Gravina, Samuel John

    A modified Robinson oscillator circuit was built for the detection of nuclear quadrupole resonance (NQR) in the 200 to 10,000 kHz region. The circuit demonstrates near ideal performance with the detected noise limited only by the sample temperature. The use of computer controlled data acquisition and a carefully designed sample probe allows for the use of an integrating time constant of up to 6 hours. This spectrometer has been used to detect ^{10}B and ^{11 }B NQR in lithium and sodium borate glasses and crystals. In pure boron oxide glass two distinct boron sites are found. By comparing this experiment with previous NMR and Raman spectroscopy studies, one of the sites, which comprises 85% of the total boron, can be attributed to boron atoms in boroxol rings. As sodium is added to the glass the abundance of boroxol rings decreases. At 20 mol% sodium oxide less than 2% of the boron atoms are found in boroxol rings. The dipole-dipole interaction between lithium cations and four-coordinated boron atoms (B_4 units) has been measured. It is found that every B_4 unit has one lithium cation next to it at an average distance of 2.82 A. A comparison with lithium borate crystals shows that diborate groups do not occur in significant quantities. Both high field and low field NMR studies of the boron quadrupole interaction in a B_4 unit also show that diborate groups are not found in the glass. A ^{23}Na and ^6Li NMR MASS study of lithium and sodium borate glasses shows that ^{23 }Na chemical shifts can distinguish sodium cations bound to non-bridging oxygens from sodium cations bound to bridging oxygens. The chemical shifts measured in lithium-sodium borate glasses are identical to those measured in lithium borate or sodium borate glasses, indicating similar alkali-oxygen coordination. A significant narrowing of the ^6Li NMR spectrum in a mixed alkali glass can be understood as a decrease in the entropy of the lithium cations. This result is consistent with the weak

  19. Molecular breast imaging. An update; Molekulare Brustbildgebung. Ein Update

    Energy Technology Data Exchange (ETDEWEB)

    Pinker, K.; Helbich, T.H.; Magometschnigg, H.; Baltzer, P. [Medizinische Universitaet Wien, Abteilung fuer Molekulare Bildgebung, Universitaetsklinik fuer Radiologie und Nuklearmedizin, Wien (Austria); Fueger, B. [Medizinische Universitaet Wien, Abteilung fuer Molekulare Bildgebung, Universitaetsklinik fuer Radiologie und Nuklearmedizin, Wien (Austria); Medizinische Universitaet Wien, Abteilung fuer Nuklearmedizin, Universitaetsklinik fuer Radiologie und Nuklearmedizin, Wien (Austria)

    2014-03-15

    The aim of molecular imaging is to visualize and quantify biological, physiological and pathological processes at cellular and molecular levels. Molecular imaging using various techniques has recently become established in breast imaging. Currently molecular imaging techniques comprise multiparametric magnetic resonance imaging (MRI) using dynamic contrast-enhanced MRI (DCE-MRI), diffusion-weighted imaging (DWI), proton MR spectroscopy ({sup 1}H-MRSI), nuclear imaging by breast-specific gamma imaging (BSGI), positron emission tomography (PET) and positron emission mammography (PEM) and combinations of techniques (e.g. PET-CT and multiparametric PET-MRI). Recently, novel techniques for molecular imaging of breast tumors, such as sodium imaging ({sup 23}Na-MRI), phosphorus spectroscopy ({sup 31}P-MRSI) and hyperpolarized MRI as well as specific radiotracers have been developed and are currently under investigation. It can be expected that molecular imaging of breast tumors will enable a simultaneous assessment of the multiple metabolic and molecular processes involved in cancer development and thus an improved detection, characterization, staging and monitoring of response to treatment will become possible. (orig.) [German] Die molekulare Bildgebung zielt auf die Darstellung, Beschreibung und Quantifizierung biologischer, physiologischer und pathologischer Prozesse auf zellulaerer und molekularer Ebene ab. In den letzten Jahren hat sich die molekulare Bildgebung mit ihren verschiedenen Modalitaeten in der Brustdiagnostik etabliert. Die molekularen Brustbildgebung umfasst derzeit die multiparametrische(MP)-MRT mit funktioneller und morphologischer kontrastmittelverstaerkter MRT (KM-MRT), molekularer diffusionsgewichteter Bildgebung (''diffusion-weighted imaging'', DWI) und metabolischer Protonenspektroskopie ({sup 1}H-MRSI) sowie nuklearmedizinische Verfahren (brustspezifische Gammakamerabildgebung [BSGI], Positronenemissionstomographie [PET], PET

  20. [Study on enhancement effect and mechanism of the acid resistance of enamel by Fe2+ and F].

    Science.gov (United States)

    Zhang, Yue; Huang, Rui-zhe

    2016-02-01

    The phase of new substances and the effect on enamel lattice was analysed after ferrous sulfate ,sodium fluoride treatment through X-ray diffraction, in order to explore the mechanism of Fe2+ and F- reinforced enamel acid resistance. Fragments of enamel obtained from fifty molars were ground into powder and randomly divided into four groups: C (control,deionized water); Fe2+ (15 mmol/L FeSO4); F- (1.23% NaF) and Fe2++F- (15 mmol/L FeSO4 and 1.23% NaF). Before exposure to acid, the samples were incubated in one of the experimental solutions for 48 hours. After that, the samples were submitted to six alternating remineralization and demineralization cycles. A complete cycle consisted of the following steps:① demineralization in 5 mL of the beverage (Coca-Cola, pH=2.58) for 5 minutes under gentle agitation;② remineralization in 5 mL of artificial saliva for 1 hour at 37℃. X-ray diffraction was employed to identify precipitates and estimate their lattice constants before enamel power dried at 40℃. The XRD pattern of the group of ferrous sulfate was not sharper than control while the full width half maximum of peak increased and became more gentle. The enamel crystal grain size and crystallinity decreased. Secondary phase retrieval showed there was new phase formed which was iron phosphate. Diffraction spectrum of ferrous sulfate with fluoride group was similar to fluoride alone, the full width half maximum of peak became sharper and more narrow.The enamel crystal grain crystallinity improved and there was new phase of calcium fluoride formed. Fe2+ and F- both had certain influence on the crystal structure of enamel. However, the impact of Fe2+ was concealed when reacted with high concentration F-. Fe2+ may participate in the nucleation of apatite through substitution of calcium in apatite. Acid-resistant enamel surfaces are established due to precipitation of ferric phosphates on the enamel surface, and combination of Fe2+ with PO4(3-) dissolved on enamel

  1. Identification and Properties of Amylase-producing Bacillus Isolated from Songhe Distiller's Yeast%宋河酒曲中产淀粉酶芽孢菌的分离鉴定及产酶特性

    Institute of Scientific and Technical Information of China (English)

    侯小歌; 王俊英; 张杰; 李学思; 李绍亮; 胡炳义

    2012-01-01

    为了有效控制宋河酒曲的制曲过程和发酵进程,对宋河酒曲中产淀粉酶芽孢菌进行了分离鉴定并研究筛选菌株的产淀粉酶特性.结果表明:从宋河酒曲中共分离到12株产淀粉酶芽孢菌,均属革兰氏阳性杆状菌,初步鉴定归为1个属5个种,即芽孢杆菌属(Bacillus)、坚硬芽孢杆菌(Bacillus firmus)、枯草芽孢杆菌( Bacillus subtilis)、地衣芽孢杆菌(Bacillus licheni formis)、凝结芽孢杆菌(Bacillus coagulans)、巨大芽孢杆菌(Bacillus megaterium),其中,坚硬芽孢杆菌是宋河大曲产淀粉酶芽孢菌的数量优势菌群,获得1株地衣芽孢杆菌SQ2为中温型高产淀粉酶菌株,其液态发酵产酶特性为37℃培养,前24 h产酶较弱,此后,酶活力迅速上升,72 h达到最大值为89 μg/(mL·min),产酶旺盛期发生在菌体成熟期和衰亡初期,产酶过程pH值先稍偏酸性后接近中性.%Amylase-producing bacilli isolated from Songhe Distiller's yeast were identified and their properties were studied to effectively control the starter-making process and fermentation process. The results showed that 12 bacillus strains which could produce amylase were isolated and identified as Bacillus firmus, Bacillus subtilis, Bacillus licheniformis, Bacillus coagulans and Bacillus megaterium , which belonged to genus of Bacillus. The B. firmus was the dominant amylase-producing bacillus in Songhe Daqu. Strain SQ2 was obtained as a high producing-amylase bacillus by determining transparent circle, its properties of producing amylase brothing under 37℃ were showed as follows: amylase-producing activity kept minimum in first fermenting 24 hours, gradually raised after 24 hours, reached primary stabilizing value to 72 hours, and decreased gently after fermenting 72 hours, the maximum value of amylase activity could reach 89 μg/(mL · min), the maximum amylase production occurred at the stage of strain maturity and decline growth. The pH value kept slightly acid

  2. Dlaczego edukacja domowa? Aksjologiczne uzasadnienia edukacji bez szkoły/ Why Home-Schooling? Axiological Justifications for an Education Outside of the School System

    Directory of Open Access Journals (Sweden)

    ANNA MARIA KUCHARSKA

    2014-06-01

    Full Text Available Od lat 90. XX wieku Polacy na nowo odkrywają edukację domową. Kształcenie i wychowanie w rodzinie nie jest nową koncepcją – poprzedzało rozwój instytucjonalnie zorganizowanej edukacji, silnie związane było z klasą społeczną i jej potrzebami. Obecnie, choć raczej w nieuświadomiony sposób, część rodziców powraca do podobnego sposobu nauczania w środowisku rodzinnym, odchodząc jednocześnie od nauczania szkolnego ze wszystkimi jego wadami. Wzorce edukacji domowej to jednak częściej bardziej współczesne modele anglosaskie, gdzie taka forma uczenia formalnego ma wielu zwolenników. Idea edukacji domowej, jak również jej praktyczne formy realizacji są intensywnie wspierane przez sieć szkół chrześcijańskich współpracujących ze Stowarzyszeniem Edukacyjnym Integracja. Początkowo może wydawać się to paradoksem – szkoła,w dodatku niepubliczna, wspierająca nauczanie poza szkołą. Poparcie nauczania domowego spójne jest z rozumieniem dominującej roli rodziny w wychowaniu i kształceniu w szkołach chrześcijańskich. Przede wszystkim podkreślany jest pokoleniowy przekaz wartości chrześcijańskich oraz ukształtowanie na wczesnym etapie życia moralnści opartej na tych wartościach. Szkoy te realizują podobną wizję wychowania i stawiają na spójność oddziaływań wychowawczych ze środowiskiem rodzinnym i kościelnym, jednak uznają rodziców za najwyższy autorytet w dziedzinie wychowania i edukacji dzieci. Zgodnie z polskimi rozwiązaniami prawnymi, dyrektor szkoły musi wyrazić zgodę na prowadzenie tego rodzaju edukacji przez konkretnych rodziców, tym samym instytucje otwarte na taką współpracę, a wręcz do nich zachęcające, są dla rodziców ogromną pomocą. W swoim artykule chciałabym wspomnieć też o kontrowersjach wokół edukacjidomowej, zwią zanych z rozwojem społecznym dziecka, socjalizacją oraz hermetycznością środowiska wychowawczego, jednak przede wszystkim interesuje

  3. The Reduction of Selenite by Bacillus licheniformis%地衣芽孢杆菌对亚硒酸盐的还原

    Institute of Scientific and Technical Information of China (English)

    朱建明; 雷磊; 肖湘; 袁永强; 秦海波; 苏惠

    2011-01-01

    利用高硒碳质泥岩中筛选出的地衣芽孢杆菌(Bacillus licheni formi),研究了该菌对亚硒酸盐硒的耐受与还原行为.结果表明,液体培养基(YEG)中,它能耐受320 mM亚硒酸盐硒的浓度,酎受硒酸盐硒的浓度可高达1000mM.然而,高浓度的亚硒酸盐硒对它的生长有明显的抑制作用.在有氧和厌氧的环境中,地衣芽孢杆菌均能还原亚硒酸盐中的硒:将四价硒还原为纳米球状的元素硒颗粒,使其分布在菌体的周边和细胞内.在含5 mM亚硒酸钠的液体培养基中,还原亚硒酸钠硒成为元素硒的平均效率约为42%.地衣芽孢杆菌在生存环境无严格要求的条件下,其还原亚硒酸盐硒形成纳米元素硒颗粒的现象,是研究生物合成低毒的纳米活性元素硒和生物修复硒污染技术的基础,也为硒的微生物矿化过程提供了契机.%Bacillus Licheniformi, which can reduce the toxic selenite anion to red elemental selenium (Se°) , was isolated from a carbonaceous mudstone with high content of Se. The results showed that this strain can stand in 320 mM SeO2-3 and in more than 1000 mM SeO2-4. However,the high concentration of SeO2-3 can inhibit the growth of the strain in liquid medium (YEG). No matter in aerobic culture or anaerobic culture that the strain was inoculated , it can reduce selenite anion to nanospheric elemental selenium granules, distributed around or within the cells. In the liquid YEG medium contains 5mM of selenite,the transformed efficiency of Se4+ to Se° by Bacillus licheniformi was 42% approximately. Since no rigorous requirement for Bacillus licheniformi to live,it is suitable to be selected in microbial remediation techniques as the strains that cope with selenium pollutions, and to produce the nano-Se granules with bioavailability. At the same time,the phenomena of selenite anions reduced to elemental Se by the bacterial provides a chance to further understand the microbial mineralization of selenium

  4. «Too many Gatsbys in the fire»: un’occasione mancata?

    Directory of Open Access Journals (Sweden)

    Roberto Serrai

    2014-05-01

    Full Text Available Da quando lo scadere del settantesimo anno dalla morte di Francis Scott Fitzgerald ha permesso di sfruttare commercialmente – e legalmente – le sue opere senza dover pagare i diritti d’autore, editori piccoli e grandi hanno invaso le librerie con nuove traduzioni dei suoi lavori più importanti. Nuove? Non sempre. Negli oltre sessant’anni che sono trascorsi dall’ultima versione italiana del Grande Gatsby (Fernanda Pivano per Mondadori, 1950, per esempio, il mondo ha «recuperato» il testo corretto dell’opera, grazie al lavoro di Matthew J. Broccoli; alcuni giovani studiosi – tra tutti, Keith Gandal del City College of New York – hanno guardato al romanzo con occhi nuovi e solida scholarship per offrirne punti di vista in parte inediti e, soprattutto, non viziati da pregiudizio; la teoria e la pratica della traduzione, infine, si sono evolute e il primato della traduzione scorrevole, accettabile e appropriante viene ormai sempre più eroso (almeno nei casi più virtuosi da traduzioni adeguate al testo e alla sua specificità culturale. Le nuove traduzioni tengono conto di tutto questo o sono solo operazioni commerciali? Questo contributo vorrebbe essere da stimolo alla nascita di una nuova tradizione nella ricezione di questo testo, che non risponda esclusivamente a logiche mercantili e narcisismi da catalogo, ma che come accadde per la versione di Fernanda Pivano formi nuove generazioni di lettori, entusiasti ma – soprattutto – consapevoli e informati. Since the coming of the seventieth year after Francis Scott Fitzgerald’s death allowed to commercially – and legally – take advantage of his works without having to pay royalties, publishers big and small flooded bookstores with new translations of his novels. New? Not always. In the more than sixty years since the last Italian version of The Great Gatsby (Fernanda Pivano, Mondadori, 1950 the world gained access to the correct text of the novel, thanks to the efforts of

  5. Effect of Endophytic Bacteria with ACC Deaminase Activity inKosteletzkya pentacarpos on Wheat Salt Tolerance%具有ACC脱氨酶活性的海滨锦葵(Kosteletzkya pentacarpos)内生细菌对小麦耐盐性的影响

    Institute of Scientific and Technical Information of China (English)

    韩坤; 田曾元; 刘珂; 张佳夜; 常银银; 郭予琦

    2015-01-01

    从盐生植物海滨锦葵块根中分离内生细菌43株,经形态学特征和16S rDNA序列相结合的方法鉴定,分属10个种属,其中芽孢杆菌属是优势属,其次是假单胞菌属和农杆菌属,蜡样芽孢杆菌(Bacillus cereus)和地衣芽孢杆菌(Bacillus licheni-formis)是优势种。对海滨锦葵内生细菌ACC脱氨酶活性的测定显示,其中5种菌明显具有ACC脱氨酶活性。用筛选到的5种细菌接种盐胁迫下小麦根系并测定其对于小麦耐盐性的影响。结果表明,蜡样芽孢杆菌、巨大芽孢杆菌(Bacillus mega-terium)、短小芽孢杆菌(Bacillus pumilus)、地衣芽孢杆菌四种芽孢杆菌均能显著提高盐胁迫下小麦幼苗的干物质重和叶绿素含量,并能显著提高保护酶(SOD、POD、CAT)活性,对盐胁迫的毒害有一定的缓解作用。绿针假单胞菌(Pseudomonas chlororaphis)对小麦幼苗株高、根长、鲜重、干重、叶绿素含量和保护酶活性的提高也具有一定的作用。上述分析表明从海滨锦葵块根中分离出的5株具有ACC脱氨酶活性的内生细菌均能提高小麦幼苗的耐盐性。%43 endophytic bacteria strains, isolated from roots of the halophyteKosteletzkya pentacarpos, belong to ten genus by 16S rDNA sequencing and the identiifcation of morphological features. Among them,Bacillus is the advantage genus, and then isPseudomonas andAgrobacterium.Bacillus cereus andBacillus licheniformis are the advantage species. ACC deaminase activity of endophytic bacteria inKosteletzkya pentacarposhas been determined. Results revealed that ifve strains could produce obvious ACC deaminase activity. These ifve kinds of bacteria were used to inoculate wheat roots under salt stress to determine their effects on the salt resistance of wheat. Data showed that four strains, includingBacillus cereus,Bacillus megaterium,Bacillus pumilusand Bacillus licheniformis,could not only promote the wheat fresh weight, dry weigh and

  6. Clinical features of 203 infants with pulmonary tuberculosis%婴儿肺结核203例临床特征分析

    Institute of Scientific and Technical Information of China (English)

    龚春竹; 朱朝敏

    2014-01-01

    Objectives To summarize the clinical features and relevant factors of 203 cases with infantile pulmonary tuberculosis. Methods Clinical data of 203 infantile with pulmonary tuberculosis were retrospectively reviewed. Results Among 203 infants, 127 (62.6%) were from country, 76 (37.4%) from city;64.5%of city infants have received BCG vaccination, which is higher than 46.5%in country infants;78 cases (38.4%) have clear evidence for active tuberculosis exposure, 26 cases (12.8%) have suspicious tuberculosis exposure;175 cases (86.2%) have fever, 165 cases (81.3%) have respiratory symptoms, 107 cases (52.7%) have pulmonary signs, 80 cases (39.4%) have hepatosplenomegaly;Etiology was conifrmed in 91 cases (44.8%);54.7%of patients were found with concurrent extrapulmonary tuberculosis, and the most commonly seen was formis tuberculous meningitis. In this study, the misdiagnosis rate is 39.9%, and 84.0%patients were often misdiagnosed as bronchial pneumonia;Vaccinated BCG rate is lower in infants with severe tuberculosis (44.83%) than that of infants with mild tuberculosis (74.14%). Conclusions Infantile pulmonary tuberculosis is featured with acute onset, severe clinical performance and easily complicated with extrapulmonary tuberculosis, atypical clinical performance, and high misdiagnosed rate which needs early detection and diagnosis. Unvaccinated BCG and active tuberculosis exposure were important clues for the diagnosis of infantile pulmonary tuberculosis.%目的:总结分析婴儿肺结核的临床特点及相关因素。方法回顾性分析2001年至2011年收治的203例婴儿肺结核的临床资料。结果203例住院肺结核患儿中,来自农村127例(62.56%),城市76例(37.44%);城市患儿BCG接种率(64.47%)高于农村(46.46%),差异有统计学意义(P<0.05)。有明确活动性肺结核接触史78例(38.42%),可疑结核接触史26例(12.81%);临床表现发热175例(86.21%),呼吸道症状165例(81.28%),有肺部体征107例(52

  7. Akcentuacja zapożyczonych leksemów czasownikowych w gwarze staroobrzędowców mieszkających w regionie suwalsko-augustowskim

    Directory of Open Access Journals (Sweden)

    Dorota Angelika Paśko-Koneczniak

    2015-12-01

    . Rodzimy zasób leksykalny badanej gwary staroobrzędowców zachowuje rosyjski system akcentuacyjny. Podobnie rzecz się ma z systemem akcentuacyjnym w leksemach zapożyczonych z języka polskiego, które podlegają adaptacji akcentuacyjnej, czyli następuje w nich przesunięcie miejsca akcentu w stosunku do języka dawcy. W zapożyczonych leksemach czasownikowych mamy do czynienia ze zmiennością akcentu uzależnioną od formy morfologicznej, niekiedy również z akcentem paroksytonicznym, wynikającym z wpływu języka polskiego.

  8. Trening siłowy w rehabilitacji osób dorosłych z mózgowym porażeniem dziecięcym

    Directory of Open Access Journals (Sweden)

    Jakub Sławomir Gąsior

    2016-03-01

    Full Text Available W artykule zaprezentowano przegląd piśmiennictwa dotyczącego zastosowania treningu siłowego kończyn dolnych w rehabilitacji dorosłych pacjentów z mózgowym porażeniem dziecięcym. W tym celu przeszukano medyczne bazy danych przy użyciu słowa kluczowego „mózgowe porażenie dziecięce” w połączeniu ze słowami „dorośli”/„osoby dorosłe”, „młodzi dorośli”, „trening siłowy”, „progresywny trening siłowy” i „trening oporowy”. Zidentyfikowano dziewięć publikacji, do analizy wybrano zaś siedem badań spełniających kryteria włączenia. Poziom dowodu naukowego zaakceptowanych badań oceniono z wykorzystaniem kryteriów zaproponowanych przez Oxford Centre for Evidence-Based Medicine. Wyniki przedstawiono zgodnie z Międzynarodową Klasyfikacją Funkcjonowania, Niepełnosprawności i Zdrowia na trzech poziomach – struktury, aktywności i partycypacji – w formie tabelarycznej. Biorąc pod uwagę wyniki badań innych niż randomizowane, można stwierdzić, że trening siłowy u dorosłych z mózgowym porażeniem dziecięcym prowadzi do wzrostu siły mięśniowej oraz wpływa na poprawę aktywności, mobilności i uczestnictwa w życiu społecznym. Powyższe rezultaty nie zostały jednak do tej pory wystarczająco potwierdzone w pracach randomizowanych. Należy podkreślić, że zastosowane protokoły treningu siłowego nie wywołały negatywnych efektów na poziomie spastyczności i biernego zakresu ruchu. Maksymalizacja korzyści płynących z treningu siłowego w grupie osób dorosłych z mózgowym porażeniem dziecięcym wymaga rozstrzygnięcia szeregu kwestii, dotyczących m.in. szczegółowej charakterystyki pacjentów, protokołu treningowego i potencjalnych czynników kontekstowych mogących wpływać na efektywność terapii tego rodzaju.

  9. Increasing Inequality in Iceland: The role of Politics and Markets in an International Comparative Perspective Aukinn ójöfnuður á Íslandi: Áhrif stjórnmála og markaðar í fjölþjóðlegum samanburði

    Directory of Open Access Journals (Sweden)

    Stefán Ólafsson

    2006-12-01

    Full Text Available Abstract in English is unavailable.Í þessari grein er fjallað um aukningu ójafnaðar í tekjuskiptingu Íslendinga síðasta áratuginn. Rannsóknin byggir á fjölþættum gögnum frá Hagstofu Íslands, ríkisskattstjóra, Þjóðhagsstofnun og Hagfræðistofnun Háskóla Íslands, auk erlendra samanburðargagna. Niðurstöður sýna að ójöfnuður jókst vegna fjölþættra áhrifa. Lágtekjufólk dróst aftur úr með minni hækkun heildartekna fyrir skatta og bætur. Hátekjufólk naut um leið meiri hækkunar sinna tekna umfram aðra í samfélaginu, einkum í formi fjármagnstekna. Skattastefna síðasta áratugar og rýrnun barna- og vaxtabótagreiðslna varð síðan til þess að magna upp ójöfnuð enn frekar og framkalla aukna gleikkun milli allra þrepa tekjustigans. Á Vesturlöndum hefur almennt gætt aukinnar tilhneigingar til ójafnaðar í tekjuskiptingu af völdum markaðarins og hnattvæðingar (fyrir skatta. Nær öll vestrænu ríkin hafa hins vegar aukið jöfnunaráhrif skatt- og velferðarkerfa sinna til að milda þessi auknu ójafnaðaráhrif. Stefnan á Íslandi var öndverð þessu, enda minnkuðu jöfnunaráhrif skatt- og velferðarkerfisins hér á landi verulega á tímabilinu og virðast þau nú vera með þeim minnstu sem finnast í hagsælu ríkjunum. Skattleysismörkin eru sá þáttur skattkerfisins sem helst jafnar tekjuskiptinguna þegar aðeins er eitt þrep í álagningunni, eins og nú er á Íslandi. Því hærri sem skattleysismörkin eru því meiri eru jöfnunaráhrif skatta við slíkar aðstæður. Ef skattleysismörk munu ekki fylgja launavísitölu á næstu árum má að öðru óbreyttu búast við að enn lengra verði gengið í ofangreinda átt, til aukins ójafnaðar í tekjuskiptingunni á Íslandi.

  10. Experimental Testing of Innovative Cold-Formed "GEB" Section / Badania Eksperymentalne Innowacyjnego Kształtownika Giętego Na Zimno Typu "Geb"

    Science.gov (United States)

    Łukowicz, Agnieszka; Urbańska-Galewska, Elżbieta; Gordziej-Zagórowska, Małgorzata

    2015-03-01

    One of the major advantages of light gauge steel structures made of cold-formed steel sections is their low weight so the production of typical single-storey steel structures of this kind of profiles is still rising. The well known profiles, e.o. Z-sections, C-sections and the so called hat-sections studied and described in the literature, are used mainly as purlins or truss components. A new profile GEB was patented for the use for primary load-bearing member in fabricated steel frames. According to the code [1] every novel cross section should be tested to assign the deformation shape and bearing capacity. The paper deals with the numerical and experimental research of bearing capacity of cold formed GEB profiles. The deformation shape and limit load was obtained from bending tests. The GEB cross section bearing capacity was also determined according to codes [1, 2]. Jedną z najważniejszych zalet lekkich konstrukcji metalowych, wytwarzanych z kształtowników giętych na zimno, jest ich mała masa, dlatego też, producenci coraz częściej wykorzystują możliwości profili giętych do wytwarzania typowych konstrukcji halowych w budownictwie systemowym. Proces gięcia na zimno, pozwala na formowanie różnego rodzaju przekrojów poprzecznych, które mogą być wykorzystywane jako elementy konstrukcji. Typowe kształty elementów. tzn. Z, C oraz tzw. przekroje kapeluszowe, które zostały przebadane i opisane w literaturze, wykorzystuje się głównie jako płatwie lub części składowe wiązarów kratowych. Nowo opatentowany przekrój typu GEB ma być wykorzystany jako element nośny konstrukcji ramowych. W związku z tym innowacyjny kształt oraz parametry geometryczne przekroju takiego kształtownika, związane z możliwością jego wyprodukowania oraz z warunkami nośności, stateczności oraz sztywności, muszą być optymalne. Według normy PN-EN 1993-1-3, każdy nowo uformowany przekrój powinien być przebadany pod kątem nośności elementu i formy

  11. The One Form/One Meaning Principle. The Case for Case. Part I

    Directory of Open Access Journals (Sweden)

    Krzysztof Korżyk

    2016-12-01

    Full Text Available The One Form/One Meaning Principle. The Case for Case. Part I The main topic of the paper is the problem of validating linguistic procedures aimed at representing the meaning of cases as they are employed in two invariant-oriented approaches to language and grammar: in Roman Jakobson’s ‘feature-based’ framework and in Gustave Guillaume’s Psychomechanics of Language. Also taken into account are trends within the cognitively-oriented approach to grammar, whose proponents object to procedures based on the structuralist principle: one form/one meaning. Ultimately, by invoking the methodological prerequisites of cognitive linguistics, as introduced in Ronald Langacker’s version of cognitive grammar, the author claims that, inasmuch as cases are concerned, there seems to be, in principle, no contradiction between introducing a stable relationship between the linguistic sign and its meaning, and positing the prototype-centered and network-based structuring of a linguistic category, as advocated in cognitive linguistics. The conclusion is that any of these three linguistic traditions could benefit by taking into account the findings of the other two approaches.   Zasada jednej formy/jednego znaczenia. Przypadek do przypadka. Część I W artykule autor omawia kwestie związane z oceną wartości językoznawczych strategii i procedur modelowania znaczenia form przypadkowych w dwóch inwariantywnie zorientowanych podejściach do języka i gramatyki – Romana Jakobsona matrycowym ujęciu cech semantycznych oraz Gustave’a Guillaume’a psychomechaniki języka. W toku wywodu autor analizuje teoretyczne uwarunkowania konstruktów służących badaniu i reprezentowaniu znaczeniowych inwariantów kategorii przypadkowych oraz form będących ich tekstowymi realizacjami. Autor bierze też pod uwagę wątpliwości przedstawicieli kognitywnie zorientowanaych badań nad kategorią przypadka dotyczące wartości wyjaśnień uzyskiwanych za pomoc

  12. Research of Formed Lunar Regholit Analog AGK-2010 / Badania wytworzonego analogu gruntu księżycowego AGK-2010

    Science.gov (United States)

    Bednarz, Stanisław; Rzyczniak, Mirosław; Gonet, Andrzej; Seweryn, Karol

    2013-06-01

    (wytrzymałość na ścinanie, kąt tarcia wewnętrznego, kohezja), (PN-EN ISO 14688-1, 2006). Istotną dla procesu badawczego wskazówkę stanowiła informacja, o ostrokrawędzistości ziarn minerałów regolitu księżycowego (Rybus T., 2009), (Sibille i in., 2006). W artykule, w formie graficznej oraz zestawień tabelarycznych, zestawiono wartości najistotniejszych, dla porównań dwóch gruntów, wielkości takich jak: skład granulometryczny (rys. 1), charakterystyki krzywych uziarnienia (tab. 1), wybrane właściwości fizyczne, np. gęstość nasypowa, barwa (pkt. 2), parametry mechaniczne, takie jak wytrzymałość na ścinanie, kąt tarcia wewnętrznego i kohezja (rys. 2 i 3, tab. 2). Istotnym osiągnięciem prowadzonych badań było uzyskanie polskiego zamiennika gruntu księżycowego, którego jednostkowy koszt wytworzenia jest wielokrotnie mniejszy od jednostkowego kosztu zakupu gruntu wzorcowego. Opracowany, polski analog gruntu księżycowego AGK-2010 (zgłoszony do Urzędu Patentowego w 2011 r.) został z powodzeniem wdrożony w testach penetratora KRET w Centrum Badań Kosmicznych Polskiej Akademii Nauk w Warszawie.

  13. Деантропонимные топонимы белорусско-польского пограничья

    Directory of Open Access Journals (Sweden)

    Юлия [IUliia] Гурская [Hurskaia

    2014-12-01

    ęść ojkonimów wywodzi się od obcojęzycznych imion chrześcijańskich. Trzecia grupa obejmuje nazwy osad, pochodzące od złożonych nazw indoeuropejskich. Na grupę czwartą składają się hybrydy nazw bałto-słowiańskich, zrekonstruowane od podstaw słowiańsko-bałtyckich, odpowiadające stosunkom etnicznym i historii osadnictwa na badanym obszarze. Nazwy bałtyckie na badanym terytorium, w formie substytucji fonetycznej i morfologicznej, dowodzą bliskich bałto-słowiańskich kontaktów językowych i kulturalnych. Liczne ojkonimy pochodzenia bałtyckiego zachowały się na badanym terytorium jako element występujący we współczesnych nazwiskach białoruskich.

  14. Polskojęzyczne choronimy w „Zebraniu Krolestw, Prowincyi, Miast stołecznych, Rzek y Gor” (1746 Józefa Uszaka Kulikowskiego

    Directory of Open Access Journals (Sweden)

    Marcin Jakubczyk

    2015-12-01

    Full Text Available Polish choronymes in Collection of Kingdoms, Provinces, Capitals, Rivers and Mountains by Józef Uszak Kulikowski (1746 This paper presents the alphabetic Latin-Polish-French dictionary of geographical names entitled Zebranie Krolestw, Prowincyi, Miast stołecznych, Rzek y Gor (Collection of Kingdoms, Provinces, Capitals, Rivers and Mountains, written by Józef Uszak Kulikowski (1746. On the one hand, the onomasticon of Kulikowski continues the type of former vocabularies defining proper names in descriptive forms, but on the other hand, in a certain way, it is in line with the latest trends in the 18th century Western lexicography, incorporating to dictionaries additions in the form of collections of geographical names. The analysis of proper names contained in the Collection has been carried out on the sample of 40 Polish choronymes relating to regions of France. It turned out that Kulikowski used many names already existing in Polish (mostly from the 16th and 17th century. In turn, the adaptation of these names which were absent in Polish and which the author of the Collection attempted to integrate into the system of his native language can be considered quite successful. In this context it is worth to mention such choronymes as Bretanija, Gujenija, Niwernija, Perigordyja, Bigor.   Polskojęzyczne choronimy w Zebraniu Krolestw, Prowincyi, Miast stołecznych, Rzek y Gor (1746 Józefa Uszaka Kulikowskiego W artykule omówiono alfabetyczny łacińsko-polsko-francuski słownik geograficznych nazw własnych pt. Zebranie Krolestw, Prowincyi, Miast stołecznych, Rzek y Gor Józefa Uszaka Kulikowskiego (1746. Z jednej strony, onomastykon Kulikowskiego kontynuuje typ dawnych słowników określających nazwy własne w formie deskrypcji, ale z drugiej – w pewien sposób wpisuje się w najnowsze tendencje w XVIII-wiecznej zachodniej leksykografii, polegające na dołączaniu do słowników dodatków w postaci zbior

  15. 全球环境管治改革:争论与进展%On Reform of Global Environmental Governance: Debates and Progress

    Institute of Scientific and Technical Information of China (English)

    阿迪尔·纳贾姆; 米哈拉·帕琶; 纳达·泰亚伯(著); 郇庆治(译)

    2012-01-01

    A major decision made by Stockholm Conference on the Human Environment held in 1972 is to establish the United Nations Environment , with its function to coordinate environmental activities of relevant United Nations agencies and to play a part of initiator of new policies under the circumstance of global environment gov- ernance. Since then, the international community has committed great efforts in making environment globalization policies (more recently, sustainable development policies) and created a large number of treaties, organizations and mechanisms. Generally speaking the global environmental governance , the progress is positive, and increasingly points to a continued expansion of system. But it is equally clear that, despite the size and funding of the global environmental governance system expanding rapidly, its substantial achievements are mild in improving global en- vironment, and in moving towards sustainable development or even reversing the trend of environmental degrada- tion. We can even say that it is the evolution of the global environmental governance system itself that brings formi- dable institutional challenges. Thus in recent years, there is a gradual consensus that we must fully consider how to reform the existing system, and discussions on the reform of global environmental governance must go beyond UNEP reform in order to build an entirely new system, in which different institutions can interact more efficiently and effectively so as to serve the ultimate goal of environmental protection and sustainable development.%产生于1972年斯德哥尔摩人类环境会议的主要组织决定就是创建联合国环境规划署,其职能是在环境全球管治中协调联合国相关机构的环境活动并担当新政策创议的发动者。自那时以来,国际社会已经在环境全球政策(以及最近在可持续发展政策)方面付出了巨大努力,并创建了大量的条约、组织和机制。从总体上说,进展是积

  16. 微波辅助溶液燃烧法制备 MgAl2 O4粉体%Synthesis of MgAl2 O4 powders by microwave-assisted combustion

    Institute of Scientific and Technical Information of China (English)

    王朔; 余俊; 赵惠忠; 李超; 王斌斌; 段连威

    2014-01-01

    High purity,low agglomeration MgAl2O4 powders were synthesized by the microwave-assisted low temperature combustion method using magnesium nitrate,aluminum nitrate and urea (mass ratio of 1 2 6.66) as starting materials,mixing in water forming a transparent precursor liquid.The effects of the microwave out-put power (200,400,600,and 700 W)on the microstructure,morphology and specific surface area of MgAl2O4 powders were analyzed.The results show that the microwave-assisted combustion method can accelerate combusti on reacti on to produce l arge vol umes of gas i nstantl y,formi ng ul tra-fi ne MgAl 2 O4 parti cl es.Moreo-ver,the increasing microwave output power accelerates the oxidation of urea,which is beneficial to the growth of MgAl2O4 grains.Under the conditions of microwave power 700 W for 2 min,the high crystallinity MgAl 2 O4 powder wi th a uni form parti cl e si ze di stri buti on (average grai n si ze of 56.03 nm)can be prepared.%将硝酸镁、硝酸铝、尿素按物质的量比为126.66制得透明混合前驱液,用低温燃烧技术与微波加热技术相结合的方法制备了高纯度、低团聚的镁铝尖晶石(MgAl2 O4)粉体。研究了燃烧反应过程中,微波输出功率(200、400、600、700 W)对MgAl2 O4粉体晶体结构、形貌及比表面积的影响。结果表明:微波高效加热方式导致燃烧反应瞬间产生大量气体,促进了MgAl2 O4超细颗粒的形成。同时,随着微波输出功率的增加,尿素氧化加速,利于MgAl2 O4晶粒的生长发育。在微波功率700 W,微波时间2 min的条件下,可制备结晶完整,粒度分布均匀(平均晶粒尺寸为56.03 nm)的MgAl2O4粉体。

  17. Use of Narcotic Drugs in the Dispensary for Inpatients in Our Hospital from 2010 to 2012%2010~2012年我院住院患者麻醉药品应用分析

    Institute of Scientific and Technical Information of China (English)

    吴惠珍; 刘静; 靳会欣

    2014-01-01

    To understand the application of narcotic drugs in our hospital patients,the reasonable application of narcotic drugs and provide reference for standardization management. Methods: To extract data of narcotics used in hospitalized patients with 2010~2012 from our hospital HIS system, calculation of drug use frequency (DDDs),defined daily cost (DDC),analysis and comparison of the drug use.Results:Narcotic drugs in our hospital in 2011 and 2012 compared to 2010 the amount of medication decreased the past three years the number of narcotic drugs varieties and specifications increased from 10 to 13,sufentanil, remifentanil has been living in narcotics sales amount and frequency of administration the first two; morphine injection DDDs ranked 3; pethidine injection use in oncology accounted for 0.3% to 0.7% of the total amount used pethidine; Oxycodone sustained-release tablets for the new varieties, consumption increased significantly, the dosageof 90.2% to 100% for application of oncology department. Oncology department narcotics oral dosage forms consumption quantity and amount are increasing year.Conclusion:Variety of narcotic drugs, dosage formis complete,the applicationof narcotic drugsis reasonable, rationaluseof narcotic drugsoncologystructure, in line with the basic principles of"Three step treatment for cancer".%目的:了解我院住院患者麻醉药品的应用情况,为麻醉药品合理应用及规范化管理提供参考。方法:从我院HIS系统提取2010~2012年住院患者麻醉药品的应用数据,计算药品用药频度(DDDs)、限定日费用(DDC),分析比较各药物的使用情况。结果:我院麻醉药品用药金额2011、2012年较2010年呈下降趋势,3年来麻醉药品品规数由10个增加至13个,舒芬太尼、瑞芬太尼一直居于麻醉药品销售金额、频率的前2位;吗啡注射液DDDs一直稳居第3位;哌替啶注射液在肿瘤科使用量仅占全院哌替啶使用量的0.3%~0.7%;羟考

  18. Probing into the local structure of quadrupolar spin systems with MRFM

    Science.gov (United States)

    Verhagen, Rieko; Hilbers, Cees; Kentgens, Arno; van Kempen, Herman

    2001-03-01

    Magnetic Resonance Force Microscopy is a method to enhance the sensitivity of conventional inductive Nuclear Magnetic Resonance. It combines the advantages of Atomic Force Microscopy with those of NMR, resulting in a method that has both high spatial resolution and sub-surface sensitivity. This gives the capability of 3D imaging and/or spectral characterization of nanoscale structures. We have adapted a conventional MRFM probe to observe nuclei other than protons. The objective of this modification lays in the possibility to observe nuclear spins with spin quantum numbers other than 1/2. In an external magnetic field (Zeeman interaction), these nuclei have multiple spin-transitions with equal energy differences, causing a single spectral line. However, the nuclei have a quadrupole moment and therefore interact with the electrical field gradient caused by charge distributions in the local environment. This shifts the spin energy levels differently so that several transitions occur at different NMR frequencies. The quadrupolar interaction can be used as a probe for obtaining information on the local structure. Since the quadrupolar splitting can be large compared to the spectral resolution of the MRFM detection method it may be imaged using MRFM. We present some methods and first results of MRFM on quadrupolar spin systems, specifically ^23Na (S=3/2) at 4.2T. It is shown that the method is capable of observing the splitting and may obtain local disorders in the lattice structure by scanning the sample.

  19. Cr2O5 as new cathode for rechargeable sodium ion batteries

    Science.gov (United States)

    Feng, Xu-Yong; Chien, Po-Hsiu; Rose, Alyssa M.; Zheng, Jin; Hung, Ivan; Gan, Zhehong; Hu, Yan-Yan

    2016-10-01

    Chromium oxide, Cr2O5, was synthesized by pyrolyzing CrO3 at 350 °C and employed as a new cathode in rechargeable sodium ion batteries. Cr2O5/Na rechargeable batteries delivered high specific capacities up to 310 mAh/g at a current density of C/16 (or 20 mA/g). High-resolution solid-state 23Na NMR both qualitatively and quantitatively revealed the reversible intercalation of Na ions into the bulk electrode and participation of Na ions in the formation of the solid-electrolyte interphase largely at low potentials. Amorphization of the electrode structure occurred during the first discharge revealed by both NMR and X-ray diffraction data. CrO3-catalyzed electrolyte degradation and loss in electronic conductivity led to gradual capacity fading. The specific capacity stabilized at >120 mAh/g after 50 charge-discharge cycles. Further improvement in electrochemical performance is possible via electrode surface modification, polymer binder incorporation, or designs of new morphologies.

  20. Observation of proximities between spin-1/2 and quadrupolar nuclei: Which heteronuclear dipolar recoupling method is preferable?

    Energy Technology Data Exchange (ETDEWEB)

    Lu, X.; Lafon, O.; Trebosc, J.; Tricot, G.; Delevoye, L.; Mear, F.; Montagne, L.; Amoureux, J. P. [UCCS (CNRS-8181), Lille North of France University, Villeneuve d' Ascq 59652 (France)

    2012-10-14

    We have recently shown that the dipolar-mediated heteronuclear multiple-quantum coherence (D-HMQC) method allows observing through-space proximities between spin-1/2 ({sup 1}H, {sup 13}C, {sup 31}P Horizontal-Ellipsis ) and quadrupolar ({sup 23}Na, {sup 27}Al Horizontal-Ellipsis ) nuclei. However, the D-HMQC effectiveness depends on the choice of the heteronuclear dipolar recoupling sequence. Here, we compare the efficiency and the robustness of four rotor-synchronized sequences: the symmetry-based ones, R4{sub 1}{sup 2}R4{sub 1}{sup -2} and its super-cycled version, SR4{sub 1}{sup 2}, and two schemes based on simultaneous amplitude and frequency modulations, denoted SFAM-1 and SFAM-2. For the SFAM methods, we point out efficient recoupling conditions that facilitate their experimental optimization and we introduce analytical expressions for the buildup of D-HMQC signal in the case of an isolated spin pair. We show that the main differences between these four sequences lie in the number of adjustable parameters and in their robustness with respect to chemical shift and homonuclear dipolar interactions. The relative performances of these four recoupling sequences are analyzed using average Hamiltonian theory, numerical simulations, and {sup 27}Al-{l_brace}{sup 31}P{r_brace} D-HMQC experiments on crystalline aluminophosphate.

  1. Structure and Chemistry in Halide Lead-Tellurite Glasses

    Energy Technology Data Exchange (ETDEWEB)

    McCloy, John S.; Riley, Brian J.; Lipton, Andrew S.; Windisch, Charles F.; Washton, Nancy M.; Olszta, Matthew J.; Rodriguez, Carmen P.

    2013-02-11

    A series of TeO2-PbO glasses were fabricated with increasing fractions of mixed alkali, alkaline earth, and lanthanide chlorides. The glass and crystal structure was studied with Raman spectroscopy, nuclear magnetic resonance (NMR), X-ray diffraction, and electron microscopy. As the chloride fraction increased, the medium-range order in the glass decreased up to a critical point (~14 mass% of mixed chlorides), above which the glasses became phase-separated. Resulting phases are a TeO2/PbO-rich phase and a crystalline phase rich in alkali chlorides. The 125Te NMR indicates, contrary to previous studies, that Te site distribution did not change with increased concentrations of M+, M2+, and M3+ cations, but rather is controlled by the Te/Pb molar ratio. The 207Pb NMR shows that two Pb species exist and their relative concentration changes nearly linearly with addition of the mixed chlorides, indicating that the additives to the TeO2-PbO glass are accommodated by changing the Pb species. The 23Na and 35Cl NMR indicate that Na and Cl are distributed in the single-phase glass phase up to the critical point, and at higher concentrations partition to crystalline phases. Transmission electron microscopy shows that the sample at the critical point contains ~10 nm seed nuclei that increase in size and concentration with exposure to the electron beam.

  2. Hole Doping Effects on Spin-gapped Na2Cu2TeO6 via Topochemical Na Deficiency

    Science.gov (United States)

    Morimoto, Kumiko; Itoh, Yutaka; Yoshimura, Kazuyoshi; Kato, Masaki; Hirota, Ken

    2006-08-01

    We report the magnetic susceptibility and NMR studies of a spin-gapped layered compound Na2Cu2TeO6 (the spin gap Δ˜ 250 K), the hole doping effect on the Cu2TeO6 plane via a topochemical Na deficiency by soft chemical treatment, and the static spin vacancy effect by nonmagnetic impurity Zn substitution for Cu. A finite Knight shift at the 125Te site was observed for pure Na2Cu2TeO6. The negative hyperfine coupling constant 125Atr is an evidence for the existence of a superexchange pathway of the Cu-O-Te-O-Cu bond. It turned out that both the Na deficiency and Zn impurities induce a Curie-type magnetism in the uniform spin susceptibility in an external magnetic field of 1 T, but only the Zn impurities enhance the low-temperature 23Na nuclear spin-lattice relaxation rate whereas the Na deficiency suppresses it. A spin glass behavior was observed for the Na-deficient samples but not for the Zn-substituted samples. The dynamics of the unpaired moments of the doped holes are different from that of the spin vacancy in the spin-gapped Cu2TeO6 planes.

  3. Structure and aqueous reactivity of silicate glasses high-resolution nuclear magnetic resonance contribution; Structure et reactivite aqueuse des verres silicates apport de la resonance magnetique nucleaire haute-resolution

    Energy Technology Data Exchange (ETDEWEB)

    Angeli, F

    2000-10-25

    This research aims at getting a better understanding of the relations which may exist between the chemical composition of the oxide silicate glasses, the structure and the aqueous reactivity. We study the cations present in most glasses, more particularly the radioactive waste glasses, and those which are more liable to bring information both about structure and reactivity. Among the experimental methods used, the nuclear magnetic resonance of multi-quantum magic-angle spinning (NMR MQ-MAS) has been carried out for the structural characterization of the pristine and altered glasses. In the first part, we discuss the possibility of deducting a type of information from a quantitative approach of the {sup 23}Na, {sup 27}Al and {sup 17}O NMR MQ-MAS. In the second part, we apply this method to glasses containing between two and six oxides. The vitreous compositions studied permit to focus our attention on the influence of sodium, aluminum and calcium on their local structural environment. We point out an evolution of the distributions of bond distances and angles in relation to the glass chemical composition. We show the strong potentiality of the {sup 17}O used to probe the pristine and altered glasses. The influence of the different cations studied on the rate of glass dissolution is debated from the alterations made on short periods. On the basis of all these data, we discuss the importance of the structural effect which may influence the kinetic phenomena of alteration. (author)

  4. Vibrational-rotational dependence of molecular properties. Electric field gradients for HCl, LiCl, NaCl and KCl

    Science.gov (United States)

    Seth, Michael; Pernpointner, Markus; Bowmaker, Graham A.; Schwerdtfeger, Peter

    The vibrational-rotational dependence of the nuclear quadrupole coupling constant (NQCC) for the isotopes 2H, 7Li, 23Na, 39K, and 35Cl is analysed in detail for the diatomic Group 1 chlorides HCl, LiCl, NaCl and KCl. The potential energy curves were calculated pointwise by using coupled cluster techniques. The electric field gradients (EFGs) and dipole moments were obtained analytically from a QCISD procedure using the Z vector method. Generally the calculated spectroscopic properties are in very good agreement with experimental data. Relativistic effects taken into account by a coupled cluster Douglas-Kroll procedure can safely be neglected for the electric field gradients up to potassium. The Inglis model which explains the trend and magnitudes of EFGs within an ionic model of weakly polarized atoms is analysed. According to this model the derivatives of the EFG, ∂nq (R)/∂Rn , with respect to the internuclear distance R should show alternating sign behaviour with increasing power n. Hence, the mechanical anharmonicity (deviation from Hooke's law potential) and the electrical anharmonicity (curvature of q(R)) are of different sign, and we expect partial cancellation of anharmonicity effects in the vibrational dependence of the NQCCs. Nevertheless, a perturbative vibrational-rotational analysis reveals a strong dependence of the chlorine and Group 1 element NQCCs on the vibrational level due to dominating mechanical anharmonicity.

  5. Unusual phase behavior in the piezoelectric perovskite system, Li(x)Na(1-x)NbO3.

    Science.gov (United States)

    Peel, Martin D; Ashbrook, Sharon E; Lightfoot, Philip

    2013-08-05

    The system Li(x)Na(1-x)NbO3 has been studied by using a combination of X-ray and neutron powder diffraction and (23)Na solid-state NMR spectroscopy. For x = 0.05 we confirm a single polar orthorhombic phase. For 0.08 ≤ x ≤ 0.20 phase mixtures of this orthorhombic phase, together with a rhombohedral phase, isostructural with the low-temperature ferroelectric polymorph of NaNbO3, are observed. The relative fractions of these two phases are shown to be critically dependent on synthetic conditions: the rhombohedral phase is favored by higher annealing temperatures and rapid cooling. We also observe that the orthorhombic phase transforms slowly to the rhombohedral phase on standing in air at ambient temperature. For 0.25 ≤ x ≤ 0.90 two rhombohedral phases coexist, one Na-rich and the other Li-rich. In this region the phase behavior is independent of reaction conditions.

  6. Network Formation by Condensed Tetrahedral [Au3Al] Units in Na2Au3Al: Crystal and Electronic Structure, Spectroscopic Investigations, and Physical Properties of an Ordered Ternary Auride.

    Science.gov (United States)

    Stegemann, Frank; Benndorf, Christopher; Zhang, Yuemei; Bartsch, Manfred; Zacharias, Helmut; Fokwa, Boniface P T; Eckert, Hellmut; Janka, Oliver

    2017-02-20

    Na2Au3Al, the first experimentally prepared compound in the ternary Na-Au-Al system, crystallizes in the cubic crystal system with space group P4132 (a = 771.42(2) pm). It can be described as a P-centered ternary ordered variant of the F-centered Laves phase MgCu2 and is isostructural to Mo3Al2C. A phase width was found for the series Na2Au4-xAlx allowing a successive substitution of Au by Al. The primitive structure forms for x ≥ 0.5. Na2Au3Al is diamagnetic at room temperature but metallic in nature, as seen from susceptibility and electrical resistivity measurements. Band structure calculations and X-ray photoelectron spectroscopy confirm the metallic nature of the title compound as states are found at the Fermi level of the DOS, along with its "auride" character. (23)Na and (27)Al solid-state-NMR investigations show the existence of both a disordered (x = 0.5 and 0.75) and a fully ordered (x = 1.0) representative within this series. Both COHP and Bader charge analyses suggest the presence of strong Au-Al interactions forming an anionic [Au3Al](δ-) network, with the Na cations occupying the cavities.

  7. Density functional theory predictions of isotropic hyperfine coupling constants.

    Science.gov (United States)

    Hermosilla, L; Calle, P; García de la Vega, J M; Sieiro, C

    2005-02-17

    The reliability of density functional theory (DFT) in the determination of the isotropic hyperfine coupling constants (hfccs) of the ground electronic states of organic and inorganic radicals is examined. Predictions using several DFT methods and 6-31G, TZVP, EPR-III and cc-pVQZ basis sets are made and compared to experimental values. The set of 75 radicals here studied was selected using a wide range of criteria. The systems studied are neutral, cationic, anionic; doublet, triplet, quartet; localized, and conjugated radicals, containing 1H, 9Be, 11B, 13C, 14N, 17O, 19F, 23Na, 25Mg, 27Al, 29Si, 31P, 33S, and 35Cl nuclei. The considered radicals provide 241 theoretical hfcc values, which are compared with 174 available experimental ones. The geometries of the studied systems are obtained by theoretical optimization using the same functional and basis set with which the hfccs were calculated. Regression analysis is used as a basic and appropriate methodology for this kind of comparative study. From this analysis, we conclude that DFT predictions of the hfccs are reliable for B3LYP/TZVP and B3LYP/EPR-III combinations. Both functional/basis set scheme are the more useful theoretical tools for predicting hfccs if compared to other much more expensive methods.

  8. Combining oximes with azides to create a novel 1-D [NaCo(III)(2)] system: synthesis, structure and solid-state NMR.

    Science.gov (United States)

    Pathmalingam, Thushan; Habib, Fatemah; Widdifield, Cory M; Loiseau, Francis; Burchell, Tara J; Gorelsky, Serge I; Beauchemin, André M; Bryce, David L; Murugesu, Muralee

    2010-02-14

    The synthesis and structure of a novel complex with the formula [NaCo(III)(2)(dmo)(2)(mu-N(3))(3)(N(3))(2)](infinity), , are reported. Complex was synthesized from the reaction of 1-(dimethylamino)propan-2-one oxime (Hdmo), CoCl(2).6H(2)O, and NaN(3) in MeOH. It crystallizes in the monoclinic space group C2/c. The molecular structure consists of one Na(I) and two Co(III) ions bridged by two oxime ligands, two end-to-end azide and three end-on azide anions. The units are linked, forming a 1-D chain. This complex was characterized by UV-Vis spectroscopy where the data confirm the presence of low-spin Co(III) ions. Solid-state (23)Na NMR experiments indicate the presence of one magnetically unique site in the repeating unit, that sample purity in the bulk powdered form is high, and that it possesses microcrystalline order. Solid-state (59)Co NMR experiments at ultra-high field (B(0) = 21.1 T) are in agreement with the structure obtained through X-ray crystallography where the Co(III) ions are coordinated to five nitrogen atoms as well as an oxygen atom.

  9. Evaluation of gamma-ray exposure buildup factors and neutron shielding for bismuth borosilicate glasses

    Science.gov (United States)

    Singh, Vishwanath P.; Badiger, N. M.; Chanthima, N.; Kaewkhao, J.

    2014-05-01

    Gamma-ray exposure buildup factor (EBF) values and neutron shielding effectiveness of bismuth borosilicate (BBS) glass systems in composition (50-x)SiO2:15B2O3:2Al2O3:10CaO:23Na2O:xBi2O3 (where x=0, 5, 10, 15 and 20 mol%) were calculated. The EBF values were computed for photon energy 0.015-15 MeV up to penetration depths of 40 mfp (mean free path) by the geometrical progression (G-P) method. The EBF values were found dependent upon incident photon energy, penetration and bismuth molar concentration. In low- and high-energy photon regions, the EBF values were minimum whereas maximum in the intermediate-energy region. The fast neutron removal cross sections for energy 2-12 MeV were calculated by the partial density method. The BBS glass with 20 mol% Bi2O3 is found to be superior gamma-ray and neutron transparent shielding. The EBF values of the BBS glasses were compared with steel-magnetite concrete and lead. The investigation was carried out to explore the advantages of the BBS glasses in different radiation shielding applications.

  10. Sensitivity enhancement of remotely coupled NMR detectors using wirelessly powered parametric amplification.

    Science.gov (United States)

    Qian, Chunqi; Murphy-Boesch, Joseph; Dodd, Stephen; Koretsky, Alan

    2012-09-01

    A completely wireless detection coil with an integrated parametric amplifier has been constructed to provide local amplification and transmission of MR signals. The sample coil is one element of a parametric amplifier using a zero-bias diode that mixes the weak MR signal with a strong pump signal that is obtained from an inductively coupled external loop. The NMR sample coil develops current gain via reduction in the effective coil resistance. Higher gain can be obtained by adjusting the level of the pumping power closer to the oscillation threshold, but the gain is ultimately constrained by the bandwidth requirement of MRI experiments. A feasibility study here shows that on a NaCl/D(2) O phantom, (23) Na signals with 20 dB of gain can be readily obtained with a concomitant bandwidth of 144 kHz. This gain is high enough that the integrated coil with parametric amplifier, which is coupled inductively to external loops, can provide sensitivity approaching that of direct wire connection.

  11. Simultaneous Acquisition of Multi-nuclei Enhanced NMR/MRI by Solution State Dynamic Nuclear Polarization

    CERN Document Server

    He, Yugui; Feng, Jiwen; Huang, Chongyang; Chen, Fang; Liu, Maili; Liu, Chaoyang

    2015-01-01

    Dynamic nuclear polarization (DNP) has become a very important hyperpolarization method because it can dramatically increase the sensitivity of nuclear magnetic resonance (NMR) of various molecules. Liquid-state DNP based on Overhauser effect is capable of directly enhancing polarizations of all kinds of nuclei in the system. The combination of simultaneous Overhauser multi-nuclei enhancements with the multi-nuclei parallel acquisitions provides a variety of important applications in both MR spectroscopy (MRS) and image (MRI). Here we present two simple illustrative examples for simultaneously enhanced multi-nuclear spectra and images to demonstrate the principle and superiority. We have observed very large simultaneous DNP enhancements for different nuclei, such as 1H and 23Na, 1H and 31P, 19F and 31P, especially for the first time to report sodium ion enhancement in liquid. We have also obtained the simultaneous imaging of 19H and 31P at low field by solution-state DNP for the first time. This method can ob...

  12. Investigations on renal organic and inorganic solutes, in vivo

    Energy Technology Data Exchange (ETDEWEB)

    Wolff, S.D.

    1989-01-01

    A basic question in renal physiology is how do the cells of the renal medulla survive the high concentrations of sodium chloride and urea which occur with antidiuresis. The problem is two-fold: (1) urea, being highly permeable to cell membranes, should enter the cell and adversely affect protein function; and (2) inorganic ions, being in much higher concentration extracellularly than intracellularly should dehydrate the cell. If these organic solutes exist in response to high concentrations of sodium chloride and urea, then their content should vary with diuretic state. Two protocols were developed to test the validity of this hypothesis. The first protocol used {sup 31}P-NMR in vivo to monitor GPC content before, during, and after acute diuresis in an exteriorized rabbit kidney model. Changes in sodium distribution and tissue structure were monitored dynamically with {sup 23}Na- and {sup 1}H-NMR imaging, respectively. The second protocol used HPLC to quantitate each of the four organic solutes in renal inner medullary homogenates. Here, the effect of diuretic state and acute diuresis on organic solute content was assessed.

  13. Study of the 12C+12C fusion reactions near the Gamow energy

    CERN Document Server

    Spillane, T; Bordeanu, C; Gialanella, L; Raiola, F; Rolfs, C; Romano, M; Sch"urmann, D; Schweitzer, J; Strieder, F; Zeng, S

    2007-01-01

    The fusion reactions 12C(12C,a)20Ne and 12C(12C,p)23Na have been studied from E = 2.10 to 4.75 MeV by gamma-ray spectroscopy using a C target with ultra-low hydrogen contamination. The deduced astrophysical S(E)* factor exhibits new resonances at E <= 3.0 MeV, in particular a strong resonance at E = 2.14 MeV, which lies at the high-energy tail of the Gamow peak. The resonance increases the present non-resonant reaction rate of the alpha channel by a factor of 5 near T = 8x10^8 K. Due to the resonance structure, extrapolation to the Gamow energy E_G = 1.5 MeV is quite uncertain. An experimental approach based on an underground accelerator placed in a salt mine in combination with a high efficiency detection setup could provide data over the full E_G energy range.

  14. Gelation of Na-alginate aqueous solution: A study of sodium ion dynamics via NMR relaxometry.

    Science.gov (United States)

    Zhao, Congxian; Zhang, Chao; Kang, Hongliang; Xia, Yanzhi; Sui, Kunyan; Liu, Ruigang

    2017-08-01

    Sodium alginate (SA) hydrogels have a wide range of applications including tissue engineering, drug delivery and formulations for preventing gastric reflux. The dynamics of sodium ions during the gelation process of SA solution is critical for clarification of the gelation procedure. In this work, nuclear magnetic resonance (NMR) relaxometry and pulsed-field-gradient (PFG) NMR diffusometry were used to investigate the dynamics of the sodium ions during the gelation of SA alginate. We find that sodium ions are in two different states with the addition of divalent calcium ions, corresponding to Ca(2+) crosslinked and un-crosslinked regions in the hydrogels. The sodium ions within the un-crosslinked regions are those released from the alginate chains without Ca(2+) crosslinking. The relative content of sodium ions within the Ca(2+) crosslinked regions decreased with the increase in the content of calcium ions in the system. The relaxation time T2 of sodium ions within the Ca(2+) crosslinked and un-crosslinked regions shift to shorter and longer relaxation time with the increase in concentration of calcium ion, which indicates the closer package of SA chains and the larger space for the diffusion of free sodium ions. This work clarifies the dynamics of (23)Na(+) in a calcium alginate gel at the equilibrium state. Copyright © 2017 Elsevier Ltd. All rights reserved.

  15. Dipole Polarizability of Alkali-Metal (Na, K, Rb) - Alkaline-Earth-Metal (Ca,Sr) Polar molecules - Prospects of Alignment

    CERN Document Server

    Gopakumar, Geetha; Hada, Masahiko; Kajita, Masatoshi

    2014-01-01

    Electronic open-shell ground-state properties of selected alkali-metal (AM) - alkaline-earth-metal (AEM) polar molecules are investigated. We determine potential energy curves of the 2{\\Sigma}+ ground state at the coupled-cluster singles and doubles with partial triples (CCSD(T)) level of electron correlation. Calculated spectroscopic constants for the isotopes (23Na, 39K, 85Rb) - (40Ca, 88Sr) are compared with available theoretical and experimental results. The variation of the permanent dipole moment (PDM), average dipole polarizability, and polarizability anisotropy with internuclear distance is determined using finite-field perturbation theory at the CCSD(T) level. Owing to moderate PDM (KCa: 1.67 D, RbCa: 1.75 D, KSr: 1.27 D, RbSr: 1.41 D) and large polarizability anisotropy (KCa: 566 a.u., RbCa: 604 a.u., KSr: 574 a.u., RbSr: 615 a.u.), KCa, RbCa, KSr, and RbSr are potential candidates for alignment and orientation in combined intense laser and external static electric fields.

  16. Analysis of amorphous solid dispersions using 2D solid-state NMR and (1)H T(1) relaxation measurements.

    Science.gov (United States)

    Pham, Tran N; Watson, Simon A; Edwards, Andrew J; Chavda, Manisha; Clawson, Jacalyn S; Strohmeier, Mark; Vogt, Frederick G

    2010-10-04

    Solid-state NMR (SSNMR) can provide detailed structural information about amorphous solid dispersions of pharmaceutical small molecules. In this study, the ability of SSNMR experiments based on dipolar correlation, spin diffusion, and relaxation measurements to characterize the structure of solid dispersions is explored. Observation of spin diffusion effects using the 2D (1)H-(13)C cross-polarization heteronuclear correlation (CP-HETCOR) experiment is shown to be a useful probe of association between the amorphous drug and polymer that is capable of directly proving glass solution formation. Dispersions of acetaminophen and indomethacin in different polymers are examined using this approach, as well as (1)H double-quantum correlation experiments to probe additional structural features. (1)H-(19)F CP-HETCOR serves a similar role for fluorinated drug molecules such as diflunisal in dispersions, providing a rapid means to prove the formation of a glass solution. Phase separation is detected using (13)C, (19)F, and (23)Na-detected (1)H T(1) experiments in crystalline and amorphous solid dispersions that contain small domains. (1)H T(1) measurements of amorphous nanosuspensions of trehalose and dextran illustrate the ability of SSNMR to detect domain size effects in dispersions that are not glass solutions via spin diffusion effects. Two previously unreported amorphous solid dispersions involving up to three components and containing voriconazole and telithromycin are analyzed using these experiments to demonstrate the general applicability of the approach.

  17. Search for Oscillation of the Electron-Capture Decay Probability of Pm-142

    Energy Technology Data Exchange (ETDEWEB)

    Vetter, Paul A; Vetter, Paul; Clark, Roderick; Dvorak, Jan; Freedman, Stuart; Gregorich, Kenneth; Jeppesen, Henrik; Mittelberger, Daniel; Wiedeking, Mathis

    2008-07-03

    We have searched for time modulation of the electron capture decay probability of 142Pm in an attempt to confirm a recent claim from a group at the Gesellschaft fur Schwerionenforschung (GSI). We produced 142Pm via the 124Sn(23Na, 5n)142Pm reaction at the Berkeley 88-Inch Cyclotron with a bombardment time short compared to the reported modulation period. Isotope selection by the Berkeley Gas-filled Separator is followed by implantation and a long period of monitoring the 142Nd K alpha x-rays from the daughter. The decay time spectrum of the x-rays is well-described by a simple exponential and the measured half-life of 40.68(53) seconds is consistent with the accepted value. We observed no oscillatory modulation at the proposed frequency at a level 31 times smaller than that reported by Litvinov (Phys. Lett. B 664 (2008) 162). A literature search for previous experiments that might have been sensitive to the reported modulation uncovered another example in 142Eu electron-capture decay. A reanalysis of the published data shows no oscillatory behavior.

  18. Effect of lactobionic acid on the acidification, rheological properties and aroma release of dairy gels.

    Science.gov (United States)

    Ribeiro, Jéssica C Bigaski; Granato, Daniel; Masson, Maria Lucia; Andriot, Isabelle; Mosca, Ana Carolina; Salles, Christian; Guichard, Elisabeth

    2016-09-15

    The food industry is investigating new technological applications of lactobionic acid (LBA). In the current work, the effect of lactobionic acid on the acidification of dairy gels (pH 5.5 and 6.2), rheological properties using a double compression test, sodium mobility using (23)Na NMR technique and aroma release using headspace GC-FID were studied. Our results showed that it is possible to use LBA as an alternative to glucono-δ-lactone (GDL) for the production of dairy gels with a controlled pH value. Small differences in the rheological properties and in the amount of aroma volatile organic compounds that were released in the vapour phase, but no significant difference in the sodium ion mobility were obtained. The gels produced with LBA were less firm and released less volatile aroma compounds than the gels produced with GDL. The gels at pH 6.2 were firmer than those at pH 5.5 and had a more organised structure around the sodium ions.

  19. Sodium-23 NMR spin-lattice relaxation rate studies of mono- and bis-intercalation in DNA

    Energy Technology Data Exchange (ETDEWEB)

    Eggert, H.; Dinesen, J.; Jacobsen, J.P. (Univ. of Copenhagen (Denmark))

    1989-04-18

    Sodium-23 spin-lattice relaxation rate measurements have been used to study the intercalation of a series of 9-aminoacridine derivatives in DNA. The {sup 23}Na relaxation rate is strongly dependent upon the amount of intercalator added to a sodium DNA solution. The results are analyzed by a combined use of the ion condensation theory and the quadrupolar relaxation theory of polyelectrolyte solutions. This interpretation shows that the major effect in lowering the relaxation rate by intercalation is not due to the release of sodium ions but is caused by a substantial decrease in the relaxation rate R{sub b} for the remaining bound sodium ions. Likewise, titration of NaDNA solutions with MgCl{sub 2} shows that condensation of Mg{sup 2+} on the DNA double helix reduces R{sub b}. A good agreement between experiment and theory is found if the average lengthening following intercalation of a 9-aminoacridine moiety is assumed to be approximately 2.7 {angstrom}. The distinction between mono- and bis-intercalation is clearly indicated by the results. The two bis-intercalating drugs examined are found to bis-intercalate only up to r {le} 0.02. For r > 0.02 the drugs apparently mono-intercalate.

  20. Improved charge breeding efficiency of light ions with an electron cyclotron resonance ion source

    Energy Technology Data Exchange (ETDEWEB)

    Vondrasek, R.; Kutsaev, Sergey [Argonne National Laboratory, Argonne, Illinois 60439 (United States); Delahaye, P.; Maunoury, L. [Grand Accelerateur National d' Ions Lourds (GANIL), CEA/DSM-CNRS/IN2P3, Blvd Henri Becquerel, 14076 Caen (France)

    2012-11-15

    The Californium Rare Isotope Breeder Upgrade is a new radioactive beam facility for the Argonne Tandem Linac Accelerator System (ATLAS). The facility utilizes a {sup 252}Cf fission source coupled with an electron cyclotron resonance ion source to provide radioactive beam species for the ATLAS experimental program. The californium fission fragment distribution provides nuclei in the mid-mass range which are difficult to extract from production targets using the isotope separation on line technique and are not well populated by low-energy fission of uranium. To date the charge breeding program has focused on optimizing these mid-mass beams, achieving high charge breeding efficiencies of both gaseous and solid species including 14.7% for the radioactive species {sup 143}Ba{sup 27+}. In an effort to better understand the charge breeding mechanism, we have recently focused on the low-mass species sodium and potassium which up to present have been difficult to charge breed efficiently. Unprecedented charge breeding efficiencies of 10.1% for {sup 23}Na{sup 7+} and 17.9% for {sup 39}K{sup 10+} were obtained injecting stable Na{sup +} and K{sup +} beams from a surface ionization source.

  1. Experimental evidence of counterion affinity in alginates: the case of nongelling ion Mg2+.

    Science.gov (United States)

    Donati, Ivan; Asaro, Fioretta; Paoletti, Sergio

    2009-10-01

    The present contribution aims at testing experimentally the theoretical model previously devised (Donati, I.; Cesaro, A.; Paoletti, S.; Biomacromolecules 2006, 7, 281-287) for the description of the interaction between alginate and nongelling Mg(2+) ions. The model, based on an extension of the counterion condensation theory, introduces a contribution of free energy of affinity, DeltaG(aff,0), which depends on the monomer composition of the polyuronate. In the present work, three different alginates separately mimicking the mannuronan (polyM), the guluronan (polyG), and the polyalternating (polyMG) components of alginate, together with a natural alginate isolated from Laminaria hyperborea ( L. hyperborea ), were examined. They were treated with Mg(2+) ions, and relative variations in scattered light intensity, isothermal calorimetry (DeltaH(mix)), specific viscosity, and (23)Na NMR longitudinal relaxation rates were monitored with respect to samples at the same ionic strength but containing only Na(+) ions. The fraction of condensed magnesium counterions was found to be strongly dependent on alginate composition, increasing along the series mannuronan < polyalternating approximately L. hyperborea < guluronan, thus in good agreement with the theoretical predictions.

  2. Spin-mapping of coal structures with ESE and ENDOR

    Energy Technology Data Exchange (ETDEWEB)

    Belford, R.L.; Clarkson, R.B.

    1990-06-01

    The overall goal of this project is the development of nondestructive techniques for studying the molecular structure of coal by probing the chemical environment of naturally occurring unpaired electrons with a variety of electron magnetic resonance spectroscopies. One exceptionally promising method for investigating molecular structure in complex solids possessing unpaired electrons is Electron Spin Echo Envelope Modulation (ESEEM) spectroscopy. Currently the aim of our S-band ESEEM work is to develop better methods for the interpretation of multifrequency ESEEM data. This problem is extremely difficult, especially for modulation resulting from quadrupolar nuclei (l > 1/2) such as {sup 33}S, {sup 14}N, and {sup 23}Na. We are pursuing two closely related paths toward this goal. One part of this effort is the development of classification system which would make ESEEM spectra more amenable to a preliminary interpretation by visual inspection. This report describes the testing of some of the capabilities of our recently constructed ESE spectrometer by carrying out a detailed investigation of the molecule DPPH, diphenylpicrylhydrazyl, a well-known stable free radical frequently used to test and tune up electron paramagnetic resonance spectrometers, but details of the nitrogen substituents on one of its aromatic rings have been uncertain and, in fact, the focus of a bit of controversy. It therefore made an excellent subject to select for this test. 14 refs., 2 figs.

  3. Pulse Electron Double Resonance Detected Multinuclear NMR Spectra of Distant and Low Sensitivity Nuclei and Its Application to the Structure of Mn(II) Centers in Organisms.

    Science.gov (United States)

    Bruch, Eduardo M; Warner, Melissa T; Thomine, Sébastien; Tabares, Leandro C; Un, Sun

    2015-10-29

    The ability to characterize the structure of metal centers beyond their primary ligands is important to understanding their chemistry. High-magnetic-field pulsed electron double resonance detected NMR (ELDOR-NMR) is shown to be a very sensitive approach to measuring the multinuclear NMR spectra of the nuclei surrounding Mn(II) ions. Resolved spectra of intact organisms with resonances arising from (55)Mn, (31)P, (1)H, (39)K, (35)Cl, (23)Na, and (14)N nuclei surrounding Mn(2+) centers were obtained. Naturally abundant cellular (13)C could be routinely measured as well. The amplitudes of the (14)N and (2)H ELDOR-NMR spectra were found to be linearly dependent on the number of nuclei in the ligand sphere. The evolution of the Mn(II) ELDOR-NMR spectra as a function of excitation time was found to be best described by a saturation phenomenon rather than a coherently driven process. Mn(II) ELDOR-NMR revealed details about not only the immediate ligands to the Mn(II) ions but also more distant nuclei, providing a view of their extended structures. This will be important for understanding the speciation and chemistry of the manganese complexes as well as other metals found in organisms.

  4. Induced radioactivity in the blood of cancer patients following Boron Neutron Capture Therapy.

    Science.gov (United States)

    Fujiwara, Keiko; Kinashi, Yuko; Takahashi, Tomoyuki; Yashima, Hiroshi; Kurihara, Kouta; Sakurai, Yoshinori; Tanaka, Hiroki; Ono, Koji; Takahashi, Sentaro

    2013-07-01

    Since 1990, Boron Neutron Capture Therapy (BNCT) has been used for over 400 cancer patients at the Kyoto University Research Reactor Institute (KURRI). After BNCT, the patients are radioactive and their (24)Na and (38)Cl levels can be detected via a Na-I scintillation counter. This activity is predominantly due to (24)Na, which has a half-life of 14.96 h and thus remains in the body for extended time periods. Radioactive (24)Na is mainly generated from (23)Na in the target tissue that is exposed to the neutron beam in BNCT. The purpose of this study is to evaluate the relationship between the radioactivity of blood (24)Na following BNCT and the absorbed gamma ray dose in the irradiated field. To assess blood (24)Na, 1 ml of peripheral blood was collected from 30 patients immediately after the exposure, and the radioactivity of blood (24)Na was determined using a germanium counter. The activity of (24)Na in the blood correlated with the absorbed gamma ray doses in the irradiated field. For the same absorbed gamma ray dose in the irradiated field, the activity of blood (24)Na was higher in patients with neck or lung tumors than in patients with brain or skin tumors. The reasons for these findings are not readily apparent, but the difference in the blood volume and the ratio of bone to soft tissue in the irradiated field, as well as the dose that leaked through the clinical collimator, may be responsible.

  5. Implementing quantum electrodynamics with ultracold atomic systems

    Science.gov (United States)

    Kasper, V.; Hebenstreit, F.; Jendrzejewski, F.; Oberthaler, M. K.; Berges, J.

    2017-02-01

    We discuss the experimental engineering of model systems for the description of quantum electrodynamics (QED) in one spatial dimension via a mixture of bosonic 23Na and fermionic 6Li atoms. The local gauge symmetry is realized in an optical superlattice, using heteronuclear boson–fermion spin-changing interactions which preserve the total spin in every local collision. We consider a large number of bosons residing in the coherent state of a Bose–Einstein condensate on each link between the fermion lattice sites, such that the behavior of lattice QED in the continuum limit can be recovered. The discussion about the range of possible experimental parameters builds, in particular, upon experiences with related setups of fermions interacting with coherent samples of bosonic atoms. We determine the atomic system’s parameters required for the description of fundamental QED processes, such as Schwinger pair production and string breaking. This is achieved by benchmark calculations of the atomic system and of QED itself using functional integral techniques. Our results demonstrate that the dynamics of one-dimensional QED may be realized with ultracold atoms using state-of-the-art experimental resources. The experimental setup proposed may provide a unique access to longstanding open questions for which classical computational methods are no longer applicable.

  6. Sodium insertion/extraction from single-walled and multi-walled carbon nanotubes: The differences and similarities

    Science.gov (United States)

    Goonetilleke, Damian; Pramudita, James C.; Choucair, Mohammad; Rawal, Aditya; Sharma, Neeraj

    2016-05-01

    A comparative study on the sodium-ion insertion and extraction of commercially-available multi-wall and single-wall carbon nanotubes is reported. Single-wall carbon nanotubes exhibit charge/discharge capacities of 126 mA h g-1 and multi-wall carbon nanotubes produce a lower capacity of 28 mA h g-1 after 50 cycles at 25 mA g-1. To understand these differences, a combination of X-ray diffraction and solid state nuclear magnetic resonance measurements were performed at various states of sodium insertion and extraction.23Na nuclear magnetic resonance studies, a technique previously rarely used for characterising electrodes from sodium-ion batteries, shows differences in the sodium chemical environment near multi-wall compared to single-wall carbon nanotubes with distinct sodium sites found to be active during sodium insertion and extraction for the carbon nanotubes. Both types of carbon nanotubes show a similar amount of reversible sodium available for insertion/extraction reactions, but multi-wall carbon nanotubes feature half the initial insertion capacity relative to single-wall carbon nanotubes. The electrochemical performance of the carbon nanotube electrodes are discussed in relation to the observed mechanism of sodium insertion.

  7. The salt and lipid composition of model cheeses modifies in-mouth flavour release and perception related to the free sodium ion content.

    Science.gov (United States)

    Boisard, Lauriane; Andriot, Isabelle; Martin, Christophe; Septier, Chantal; Boissard, Vanessa; Salles, Christian; Guichard, Elisabeth

    2014-02-15

    Reducing salt and lipid levels in foodstuffs without any effect on acceptability is a major challenge, particularly because of their interactions with other ingredients. This study used a multimodal approach to understand the effects of changes to the composition of model cheeses (20/28, 24/24, 28/20 lipid/protein ratios, 0% and 1% added NaCl) on sodium ion mobility ((23)Na NMR), in-mouth sodium release and flavour perception. An increase in the salt content decreased cheese firmness and perceived hardness, and increased sodium ion mobility, in vivo sodium release and both saltiness and aroma perception. With the same amount of salt, a lower lipid/protein ratio increased the firmness of the cheeses, perceived hardness, and decreased sodium ion mobility, in vivo sodium release, saltiness and aroma perception. These findings suggest on one hand that it could be possible to increase saltiness perception by varying cheese composition, thus inducing differences in sodium ion mobility and in free sodium ion concentration, leading to differences in in-mouth sodium release and saltiness perception, and on the other hand that the reformulation of foods in line with health guidelines needs to take account of both salt content and the lipid/protein ratio.

  8. Relaxation of coherent states in a two-qubit NMR quadrupole system

    Energy Technology Data Exchange (ETDEWEB)

    Sarthour, R.S.; Guimaraes, A.P.; Oliveira, I.S. [Centro Brasileiro de Pesquisas Fisicas (CBPF), Rio de Janeiro, RJ (Brazil); Azevedo, E.R. de; Bonk, F.A.; Vidoto, E.L.G.; Bonagamba, T.J. [Universidade de Sao Paulo (IFSC/USP), Sao Carlos, SP (Brazil). Inst. de Fisica; Freitas, J.C.C. [Universidade Federal do Espirito Santo (UFES), Vitoria, ES (Brazil). Dept. de Fisica

    2003-07-01

    Full text: Pulse Nuclear Magnetic Resonance (NMR) is one of the most serious candidates as an experimental technique for implementing quantum algorithms. To the present date, this technique is in fact the only one where full demonstrations of quantum algorithms implementations have been carried out, in spite of various technical difficulties. On NMR quantum computers, gates and subroutines are encoded as radiofrequency pulse sequences, which must act over coherent states. These sequences usually take tens of milliseconds to be implemented, and during this time the system relax towards equilibrium. Therefore, studies of relaxation times are very important to the realization of quantum algorithms via NMR. In this work we studied the longitudinal relaxation of various coherent states on the NMR quantum computing two-qubit quadrupole system, {sup 23}Na in C{sub 10}H{sub 21}NaO{sub 4}S liquid crystal at room temperature. Relaxation of pseudo-pure states |00>, |01>, |10>, |11>, pseudo-Bell states |01> + |10> and |00> + |11> and Hadamard states |00> + |01> and |10> + |11> were investigated. Experimental curves follow a multi exponential model of relaxation which takes into account mixed, dipolar magnetic and quadrupolar electric interactions. (author)

  9. Quantum state tomography for quadrupole nuclei and its applications on a two-qubit system

    Energy Technology Data Exchange (ETDEWEB)

    Bonk, F.A.; Azevedo, E.R. de; Mantovani, G.L.; Bonagamba, T.J. [Sao Paulo Univ., Sao Carlos, SP (Brazil). Inst. de Fisica]. E-mail: azevedo@if.sc.usp.br; Sarthour, R.S.; Bulnes, J.D.; Guimaraes, A.P.; Oliveira, I.S. [Centro Brasileiro de Pesquisas Fisicas (CBPF), Rio de Janeiro, RJ (Brazil)]. E-mails: sarthour@cbpf.br; apguima@cbpf.br; ivan@cbpf.br; Freitas, J.C.C. [Espirito Santo Univ., Vitoria (Brazil). Dept. de Fisica

    2004-05-01

    A method for performing quantum state tomography for quadrupole nuclei is presented in this paper. First, it is shown that upon appropriate phase cycling, the NMR intensities of quadrupole nuclei depend only on diagonal elements of the density matrix. Thus, a method for obtaining the density matrix elements, which consists of dragging off-diagonal elements into the main diagonal using fine phase-controlled selective radiofrequency pulses, was derived. The use of the method is exemplified through {sup 23} Na NMR (nuclear spin I = 3/2) in a lyotropic liquid-crystal at room temperature, in three applications: (a) the tomography of pseudo-pure states; (b) the tomography of the quadrupole free evolution of the density matrix, and (c) the unitary state evolution of each qubit in the system over the Bloch sphere upon the application of a Hadamard gate. Further applications in the context of pure NMR and in the context of quantum information processing, as well as generalizations for higher spins, are discussed. (author)

  10. Quantum state tomography for quadrupolar nuclei using global rotations of the spin system.

    Science.gov (United States)

    Teles, J; deAzevedo, E R; Auccaise, R; Sarthour, R S; Oliveira, I S; Bonagamba, T J

    2007-04-21

    In this paper, we describe a quantum state tomography method based on global rotations of the spin system which, together with a coherence selection scheme, enables the complete density matrix reconstruction. The main advantage of this technique, in respect to previous proposals, is the use of much shorter rf pulses, which decreases significantly the time necessary for algorithm quantum state tomography. In this case, under adequate experimental conditions, the rf pulses correspond to simple spatial rotations of the spin states, and its analytical description is conveniently given in the irreducible tensor formalism. Simulated results show the feasibility of the method for a single spin 72 nucleus. As an experimental result, we exemplify the application of this method by tomographing the steps during the implementation of the Deutsch algorithm. The algorithm was implemented in a (23)Na quadrupole nucleus using the strongly modulated pulses technique. We also extended the tomography method for a 3-coupled homonuclear spin 12 system, where an additional evolution under the internal Hamiltonian is necessary for zero order coherences evaluation.

  11. New band structures and an unpaired crossing in {sup 78}Kr

    Energy Technology Data Exchange (ETDEWEB)

    Sun, H.; Doring, J.; Johns, R.A.; Solomon, G.; Tabor, S.; Devlin, M.; LaFosse, D.; Lerma, F.; Sarantites, D.; Baktash, C.; Rudolph, D.; Yu, C.H.; Lee, I.Y.; Macchiavelli, A.; Birriel, I.; Saladin, J.; Winchell, D.; Wood, V.Q.; Ragnarsson, I.

    1998-07-06

    High-spin states in {sup 78}Kr were studied using the {sup 58}Ni({sup 23}Na,3p) reaction at 70 MeV and the {sup 58}Ni({sup 28}Si,{alpha}4p) reaction at 130 MeV. Prompt {gamma}-{gamma} coincidences were measured using the Pitt-FSU detector array and the GAMMASPHERE-MICROBALL array. Results from these experiments have led to 26 new excitation levels, some of which have been grouped into 3 new bands. Spins were assigned based on directional correlations of oriented nuclei. Two of the new negative-parity bands appear to form a signature-partner pair based on a two-quasineutron structure, in contrast to the previously known two-quasiproton negative-parity bands. A forking has been observed at the 24{sup +} state in the yrast band, which calculations suggest may result from an unpaired crossing. The available evidence suggests oblate shapes in the yrast band coexist with prolate shapes in the negative-parity bands.

  12. New band structures and an unpaired crossing in {sup 78}Kr

    Energy Technology Data Exchange (ETDEWEB)

    Sun, H.; Doering, J.; Johns, G.D.; Kaye, R.A.; Solomon, G.Z.; Tabor, S.L. [Department of Physics, Florida State University, Tallahassee, Florida 32306 (United States); Doering, J. [Department of Physics, University of Notre Dame, Notre Dame, Indiana 46556 (United States); Devlin, M.; LaFosse, D.R.; Lerma, F.; Sarantites, D.G. [Department of Chemistry, Washington University, St. Louis, Missouri 63130 (United States); Baktash, C.; Rudolph, D.; Yu, C. [Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831 (United States); Lee, I.Y.; Macchiavelli, A.O. [Nuclear Science Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720 (United States); Birriel, I.; Saladin, J.X.; Winchell, D.F.; Wood, V.Q. [Department of Physics and Astronomy, University of Pittsburgh, Pittsburgh, Pennsylvania 15260 (United States); Ragnarsson, I. [Department of Mathematical Physics, Lund Institute of Technology, S-22100 Lund (Sweden)

    1999-02-01

    High-spin states in {sup 78}Kr were studied using the {sup 58}Ni({sup 23}Na,3p) reaction at 70 MeV and the {sup 58}Ni({sup 28}Si,{alpha}4p) reaction at 130 MeV. Prompt {gamma}-{gamma} coincidences were measured using the Pitt-FSU detector array and the GAMMASPHERE-MICROBALL array. Results from these experiments have led to 26 new excitation levels, some of which have been grouped into 3 new bands. Spins were assigned based on directional correlations of oriented nuclei. Two of the new negative-parity bands appear to form a signature-partner pair based on a two-quasineutron structure, in contrast to the previously known two-quasiproton negative-parity bands. A forking has been observed at the 24{sup +} state in the yrast band, which calculations suggest may result from an unpaired crossing. The available evidence suggests oblate shapes in the yrast band coexist with prolate shapes in the negative-parity bands. {copyright} {ital 1999} {ital The American Physical Society}

  13. High radio-frequency field strength nutation NMR of quadrupolar nuclei

    Science.gov (United States)

    Franssen, W. M. J.; Rezus, Y. L. A.; Kentgens, A. P. M.

    2016-12-01

    Owing to the introduction of microcoils, high RF field strength nutation NMR is a viable candidate for the study of quadrupolar nuclei with strong quadrupolar couplings, not accessible using contemporary NMR techniques. We show powder 23 Na nutation spectra on sodium nitrite for RF field strengths of up to 1170 kHz, that conform to theoretical predictions. For lanthanum fluoride powder, 139 La nutation spectra taken at elevated RF field amplitudes show clear discrepancies when compared to the theory. These errors are shown to be mainly caused by pulse transients at the end of the pulse, which proved to be detrimental to the shape of the nutation spectra. Using a nutation pulse which ends in a sudden frequency jump, we show that these errors can be reduced, and nutation spectra that conform to theory can be readily acquired. This enables nutation NMR for the study of quadrupolar nuclei with a strong quadrupolar coupling, bridging the gap between NMR, which can only analyse nuclei with a weak to medium quadrupolar coupling, and NQR, were extensive searching for the right quadrupolar frequency is the limiting factor.

  14. Counter-ion dynamics in crosslinked poly(styrene sulfonate) systems studied by NMR.

    Science.gov (United States)

    Tromp, R H; van der Maarel, J R; de Bleijser, J; Leyte, J C

    1991-10-01

    The field dependence of the longitudinal and transverse nuclear magnetic relaxation rates of 23Na+ in aqueous crosslinked Na-poly(styrene sulfonate) (PSS) systems (ion exchange resins) has been obtained as a function of the degree of crosslinking. The relaxation is considerably enhanced relative to solutions of non-crosslinked NaPSS at equal ionizable group concentration. This is due to the dynamic constraints of the polymer chains, which render the averaging of the counter-ion chain interaction less efficient. The field dependence of the relaxation rates in the crosslinked NaPSS systems reveals two processes that are out of the extreme narrowing limit. This is in contrast to the relaxation behavior found in non-crosslinked NaPSS systems. To characterize these processes their correlation times were combined with constants of selfdiffusion to estimate the distances diffused by an ion in order to average the electric field gradient at its nucleus. These two distances are interpreted as characteristic length scales in the network. At all degrees of crosslinking it was found that the smallest of these length scales is roughly equal to the distance between two neighbouring crosslinks. The largest characteristic distance extends over several crosslinks and reflects inhomogeneities in the crosslink concentration. These conclusions were also reached from similar experiments on 7Li+ in LiPSS systems.

  15. A multinuclear static NMR study of geopolymerisation

    Energy Technology Data Exchange (ETDEWEB)

    Favier, Aurélie, E-mail: aurelie.favier@epfl.ch [Univ Paris-Est, IFSTTAR, Materials Department, 14-20 bd Newton, F-77447 Marne la Vallée Cedex 2 (France); Habert, Guillaume [Institute for Construction and Infrastructure Management, ETH Zurich, CH-8093 Zurich (Switzerland); Roussel, Nicolas [Univ Paris-Est, IFSTTAR, Materials Department, 14-20 bd Newton, F-77447 Marne la Vallée Cedex 2 (France); D' Espinose de Lacaillerie, Jean-Baptiste [Ecole Supérieure de Physique et de Chimie Indusrtrielles de la Ville de Paris (ESPCI), ParisTech, PSL Research University, Soft Matter Sciences and Engineering Laboratory SIMM, CNRS UMR 7615, 10 rue Vauquelin, F-75005 Paris (France)

    2015-09-15

    Geopolymers are inorganic binders obtained by alkali activation of aluminosilicates. While the structure of geopolymers is now well understood, the details of the geopolymerisation reaction and their impact on the rheology of the paste remain uncertain. In this work, we follow the elastic properties of a paste made with metakaolin and sodium silicate solution. After the first sharp increase of elastic modulus occurring a few hundred of seconds after mixing and related to the heterogeneous formation of an alumina–silicate gel with a molar ratio Si/Al < 4 located at the grains boundaries, we focus on the progressive increase in elastic modulus on a period of few hours during the setting of the geopolymer. In this study, we combine the study of rheological properties of the paste with {sup 23}Na, {sup 27}Al and {sup 29}Si static NMR measurement in order to better understand the origin of this second increase in elastic modulus. Our results show that, after a few hours, Al and Na evolution in the liquid phase are concomitant. This suggests the precipitation of an aluminosilicate phase where Al is in tetrahedral position and Na compensates the charge. Furthermore, Si speciation confirms this result and allows us to identify the precipitation of a product, which has a chemical composition close to the final composition of geopolymer. This study provides strong evidence for a heterogeneous formation of an aluminosilicate glass directly from the first gel and the silicate solution without the need for a reorganisation of Gel 1 into Gel 2.

  16. Reconciling Local Structure Disorder and the Relaxor State in (Bi1/2Na1/2)TiO3-BaTiO3

    Science.gov (United States)

    Groszewicz, Pedro B.; Gröting, Melanie; Breitzke, Hergen; Jo, Wook; Albe, Karsten; Buntkowsky, Gerd; Rödel, Jürgen

    2016-08-01

    Lead-based relaxor ferroelectrics are key functional materials indispensable for the production of multilayer ceramic capacitors and piezoelectric transducers. Currently there are strong efforts to develop novel environmentally benign lead-free relaxor materials. The structural origins of the relaxor state and the role of composition modifications in these lead-free materials are still not well understood. In the present contribution, the solid-solution (100-x)(Bi1/2Na1/2)TiO3-xBaTiO3 (BNT-xBT), a prototypic lead-free relaxor is studied by the combination of solid-state nuclear magnetic resonance (NMR) spectroscopy, dielectric measurements and ab-initio density functional theory (DFT). For the first time it is shown that the peculiar composition dependence of the EFG distribution width (ΔQISwidth) correlates strongly to the dispersion in dielectric permittivity, a fingerprint of the relaxor state. Significant disorder is found in the local structure of BNT-xBT, as indicated by the analysis of the electric field gradient (EFG) in 23Na 3QMAS NMR spectra. Aided by DFT calculations, this disorder is attributed to a continuous unimodal distribution of octahedral tilting. These results contrast strongly to the previously proposed coexistence of two octahedral tilt systems in BNT-xBT. Based on these results, we propose that considerable octahedral tilt disorder may be a general feature of these oxides and essential for their relaxor properties.

  17. Undergraduate Measurements For Fission Reactor Applications

    Science.gov (United States)

    Hicks, S. F.; Kersting, L. J.; Lueck, C. J.; McDonough, P.; Crider, B. P.; McEllistrem, M. T.; Peters, E. E.; Vanhoy, J. R.

    2011-06-01

    Undergraduate students at the University of Dallas (UD) have investigated elastic and inelastic neutron scattering cross sections on structural materials important for criticality considerations in nuclear fission processes. Neutrons scattered off of 23Na and NatFe were detected using neutron time-of-flight techniques at the University of Kentucky Low-Energy Nuclear Accelerator Facility. These measurements are part of an effort to increase the efficiency of power generation from existing fission reactors in the US and in the design of new fission systems. Students have learned the basics of how to operate the Model CN Van de Graaff generator at the laboratory, setup detectors and electronics, use data acquisition systems, and they are currently analyzing the angular dependence of the scattered neutrons for incident neutron energies of 3.57 and 3.80 MeV. Most students participating in the project will use the research experience as the material for their undergraduate research thesis required for all Bachelor of Science students at the University of Dallas. The first student projects on this topic were completed during the summer of 2010; an overview of student participation in this investigation and their preliminary results will be presented.

  18. Recent experiments with ring Bose-Einstein condensates

    Science.gov (United States)

    Eckel, S.; Kumar, A.; Anderson, N. W.; Campbell, G. K.

    2016-05-01

    Here, we present three recent results of our experiments with ring-shaped 23 Na Bose-Einstein condensates. First, we present results of the effect of temperature on the decay of persistent currents in the presence of a local, stationary perturbation, or weak link. When the weak link rotates, it can drive transitions between quantized persistent current states in the ring, that form hysteresis loops whose size depends strongly on temperature. We find that our data does not fit with a simple model of thermal activation. Second, we present a new method to measure the quantized persistent current state of the ring in a minimally-destructive way. This technique uses phonons as probes of the background flow through the Doppler effect. Finally, we present a set of experiments designed to reproduce the horizon problem in the early universe. Supersonic expansion of the ring creates causally-disconnected regions of BEC whose phase evolves at different rates. When the expansion stops and these regions are allowed to recombine, they form topological excitations. These excitations can be predicted using a simple theory that shows excellent agreement with the data.

  19. Local structure of alkalis in mixed-alkali borate glass to elucidate the origin of mixed-alkali effect

    Directory of Open Access Journals (Sweden)

    Yomei Tokuda

    2015-12-01

    Full Text Available We report the structural analysis of Na+ and Cs+ in sodium cesium borate crystals and glasses using 23Na and 133Cs magic-angle spinning nuclear magnetic resonance (MAS NMR spectroscopy. The composition dependence of NMR spectra of the borate was similar to that of the silicate: (1 the peak position of cesium borate crystals shifted to upfield for structures with larger Cs+ coordination numbers, (2 the MAS NMR spectra of xNa2O-yCs2O-3B2O3 (x = 0, 0.25, 0.5, 0.75, 1.0, x + y = 1 glass showed that the average coordination number (CN of both the alkali cations decreases with increasing Cs+/(Na+ + Cs+ ratio. However, the degree of decrement in borates is much smaller than that in silicates. We have considered that the small difference in CN is due to 4-coordinated B, because it is electrically compensated by the alkali metal ions resulting in the restriction of having various coordinations of O to alkali metal.

  20. Nucleosynthesis of light elements inside thermally pulsing AGB stars I the case of intermediate-mass stars

    CERN Document Server

    Forestini, M; Forestini, Manuel; Charbonnel, Corinne

    1996-01-01

    The structural and nucleosynthetic evolution of 3, 4, 5, 6 and \\mass{7} stars with two metallicities ($Z = 0.005$ and 0.02) has been computed in detail, from the early pre-main sequence phase up to the thermally pulsing (TP) AGB phase or the onset of off-center carbon burning. Typically 10 to 20 thermal pulses have been followed for each TP-AGB object. This homogeneous and quite large set of models allows us to present an overview of the thermal pulse properties as well as of the nucleosynthesis accompanying the TP-AGB phase of intermediate-mass stars. More specifically, after a brief description of the previous evolutionary stages, predictions are given for the isotopic ratios involving C, N, O, Ne, Mg, Al and Si. Also the surface abundances of 7Li, 19F and 23Na are reported. As the asymptotic phase of the thermal pulses has been reached for each star, we also indicate how these abundances will probably evolve until the stars completely loose their envelope, by including the evolution of the nucleosynthesis ...

  1. Radium geochemistry in Na-Cl type groundwater in Niigata Prefecture, Japan.

    Science.gov (United States)

    Tomita, Junpei; Satake, Hiroshi; Fukuyama, Taijiro; Sasaki, Keiichi; Sakaguchi, Aya; Yamamoto, Masayoshi

    2010-03-01

    Radium isotopes in 23 Na-Cl type groundwater sampled mainly from deep wells in Niigata Prefecture, which is the site of the largest oil- and gas-fields in Japan, were measured along with U isotopes, chemical components and hydrogen and oxygen isotope ratios to elucidate the distribution and behavior of Ra in a brackish environment underground. Also analyzed were U and Th isotopes in 38 rock samples collected from outcrops at 17 locations. Ra-226 concentrations (8.86-1637 mBq kg(-1)) of groundwater samples roughly correlated with total dissolved solid (TDS) concentrations and other alkaline earth contents. Their (228)Ra/(226)Ra activity ratios (0.32-5.2) were similar to or higher than the (232)Th/(238)U activity ratios (0.6-1.7) in the rocks. The most likely transport mechanism of Ra isotopes into groundwater was due to their alpha-recoil from the solid phase, probably from the water-rock interface where Th isotopes had accumulated, and adsorption/desorption reaction based on the increase in (226)Ra contents with TDS.

  2. Long-range interactions between polar bialkali ground-state molecules in arbitrary vibrational levels

    CERN Document Server

    Vexiau, R; Aymar, M; Bouloufa-Maafa, N; Dulieu, O

    2015-01-01

    We have calculated the isotropic $C\\_6$ coefficients characterizing the long-range van der Waals interaction between two identical heteronuclear alkali-metal diatomic molecules in the same arbitrary vibrational level of their ground electronic state $X^1\\Sigma^+$. We consider the ten species made up of $^7$Li, $^{23}$Na, $^{39}$K, $^{87}$Rb and $^{133}$Cs. Following our previous work [M.~Lepers \\textit{et.~al.}, Phys.~Rev.~A \\textbf{88}, 032709 (2013)] we use the sum-over-state formula inherent to the second-order perturbation theory, composed of the contributions from the transitions within the ground state levels, from the transition between ground-state and excited state levels, and from a crossed term. These calculations involve a combination of experimental and quantum-chemical data for potential energy curves and transition dipole moments. We also investigate the case where the two molecules are in different vibrational levels and we show that the Moelwyn-Hughes approximation is valid provided that it i...

  3. The 12C + 12C reaction and the impact on nucleosynthesis in massive stars

    CERN Document Server

    Pignatari, M; Wiescher, M; Gallino, R; Bennett, M; Beard, M; Fryer, C; Herwig, F; Rockefeller, G; Timmes, F X; 10.1088/0004-637X/762/1/31

    2012-01-01

    Despite much effort in the past decades, the C-burning reaction rate is uncertain by several orders of magnitude, and the relative strength between the different channels 12C(12C,alpha)20Ne, 12C(12C,p)23Na and 12C(12C,n)23Mg is poorly determined. Additionally, in C-burning conditions a high 12C+12C rate may lead to lower central C-burning temperatures and to 13C(alpha,n)16O emerging as a more dominant neutron source than 22Ne(alpha,n)25Mg, increasing significantly the s-process production. This is due to the rapid decrease of the 13N(gamma,p)12C with decreasing temperature, causing the 13C production via 13N(beta+)13C. Presented here is the impact of the 12C+12C reaction uncertainties on the s-process and on explosive p-process nucleosynthesis in massive stars, including also fast rotating massive stars at low metallicity. Using various 12C+12C rates, in particular an upper and lower rate limit of ~ 50000 higher and ~ 20 lower than the standard rate at 5*10^8 K, five 25 Msun stellar models are calculated. The...

  4. The first direct measurement of 12C(12C,n)23Mg at stellar energies

    CERN Document Server

    Bucher, B; Fang, X; Heger, A; Almaraz-Calderon, S; Alongi, A; Ayangeakaa, A D; Beard, M; Best, A; Browne, J; Cahillane, C; Couder, M; deBoer, R J; Kontos, A; Lamm, L; Li, Y J; Long, A; Lu, W; Lyons, S; Notani, M; Patel, D; Paul, N; Pignatari, M; Roberts, A; Robertson, D; Smith, K; Stech, E; Talwar, R; Tan, W P; Wiescher, M; Woosley, S E

    2015-01-01

    Neutrons produced by the carbon fusion reaction 12C(12C,n)23Mg play an important role in stellar nucleosynthesis. However, past studies have shown large discrepancies between experimental data and theory, leading to an uncertain cross section extrapolation at astrophysical energies. We present the first direct measurement that extends deep into the astrophysical energy range along with a new and improved extrapolation technique based on experimental data from the mirror reaction 12C(12C,p)23Na. The new reaction rate has been determined with a well-defined uncertainty that exceeds the precision required by astrophysics models. Using our constrained rate, we find that 12C(12C,n)23Mg is crucial to the production of Na and Al in Pop-III Pair Instability Supernovae. It also plays a non-negligible role in the production of weak s-process elements as well as in the production of the important galactic gamma-ray emitter 60Fe.

  5. A multinuclear solid-state NMR study of alkali metal ions in tetraphenylborate salts, M[BPh4] (M = Na, K, Rb and Cs): what is the NMR signature of cation-pi interactions?

    Science.gov (United States)

    Wu, Gang; Terskikh, Victor

    2008-10-16

    We report a multinuclear solid-state ( (23)Na, (39)K, (87)Rb, (133)Cs) NMR study of tetraphenylborate salts, M[BPh 4] (M = Na, K, Rb, Cs). These compounds are isostructural in the solid state with the alkali metal ion surrounded by four phenyl groups resulting in strong cation-pi interactions. From analyses of solid-state NMR spectra obtained under stationary and magic-angle spinning (MAS) conditions at 11.75 and 21.15 T, we have obtained the quadrupole coupling constants, C Q, and the chemical shift tensor parameters for the alkali metal ions in these compounds. We found that the observed quadrupole coupling constant for M (+) in M[BPh 4] is determined by a combination of nuclear quadrupole moment, Sternheimer antishielding factor, and unit cell dimensions. On the basis of a comparison between computed paramagnetic and diamagnetic contributions to the total chemical shielding values for commonly found cation-ligand interactions, we conclude that cation-pi interactions give rise to significantly lower paramagnetic shielding contributions than other cation-ligand interactions. As a result, highly negative chemical shifts are expected to be the NMR signature for cations interacting exclusively with pi systems.

  6. Two-dimensional cross-section sensitivity and uncertainty analysis of the LBM (Lithium Blanket Module) experiments at LOTUS

    Energy Technology Data Exchange (ETDEWEB)

    Davidson, J.W.; Dudziak, D.J.; Pelloni, S.; Stepanek, J.

    1988-01-01

    In a recent common Los Alamos/PSI effort, a sensitivity and nuclear data uncertainty path for the modular code system AARE (Advanced Analysis for Reactor Engineering) was developed. This path includes the cross-section code TRAMIX, the one-dimensional finite difference S/sub N/-transport code ONEDANT, the two-dimensional finite element S/sub N/-transport code TRISM, and the one- and two-dimensional sensitivity and nuclear data uncertainty code SENSIBL. Within the framework of the present work a complete set of forward and adjoint two-dimensional TRISM calculations were performed both for the bare, as well as for the Pb- and Be-preceeded, LBM using MATXS8 libraries. Then a two-dimensional sensitivity and uncertainty analysis for all cases was performed. The goal of this analysis was the determination of the uncertainties of a calculated tritium production per source neutron from lithium along the central Li/sub 2/O rod in the LBM. Considered were the contributions from /sup 1/H, /sup 6/Li, /sup 7/Li, /sup 9/Be, /sup nat/C, /sup 14/N, /sup 16/O, /sup 23/Na, /sup 27/Al, /sup nat/Si, /sup nat/Cr, /sup nat/Fe, /sup nat/Ni, and /sup nat/Pb. 22 refs., 1 fig., 3 tabs.

  7. Cardiac magnetic resonance spectroscopy: potential clinical applications

    Energy Technology Data Exchange (ETDEWEB)

    Neubauer, S. [Dept. of Cardiovascular Medicine, Oxford Univ. (United Kingdom)

    2000-06-01

    MR spectroscopy is the only method for non-invasive detection of various aspects of cardiac metabolism in humans. While the {sup 1}H nucleus of water and fat molecules is the signal source for MR imaging, the MR spectroscopic technique allows for the study of a number of other nuclei, such as {sup 13}C, {sup 19}F, {sup 23}Na, {sup 31}P, {sup 39}K and {sup 87}Rb. Clinical applications presently are confined to the {sup 31}P nucleus. {sup 31}P-MR spectroscopy allows the non-invasive study of cardiac high-energy phosphate metabolites ATP and phosphocreatine. The phosphocreatine/ATP ratio is considered an index of the energetic state of the heart. Possible clinical indications include heart failure, valve disease and coronary artery disease. In heart failure, the phosphocreatine/ATP ratio is reduced and correlates with clinical severity, ejection fraction and prognosis. In mitral and aortic valve disease, a reduced phosphocreatine/ATP ratio may indicate the optimum timing for valve replacement. In coronary artery disease, a regional decrease of phosphocreatine during stress (''biochemical ergometry'') may indicate local ischemia. Furthermore, absolute quantification of high-energy phosphates may allow diagnosis of myocardial viability. Major technical developments, leading to improved spatial and temporal resolution will be necessary to establish MR spectroscopy as a routine clinical tool. (orig.) [German] Die MR-Spektroskopie ist die einzige Methode, die es erlaubt, am Patienten verschiedene Aspekte des Myokardstoffwechsels nichtinvasiv zu untersuchen. Waehrend der {sup 1}H-Kern der Wasser- und Fettmolekuele die Signalquelle fuer die MR-Bildgebung darstellt, kann man mit der Spektroskopie eine Vielzahl anderer Kerne wie {sup 13}C, {sup 19}F, {sup 23}Na, {sup 31}P, {sup 39}K und {sup 87}Rb untersuchen. Klinische Anwendungen sind bisher auf die {sup 31}P-MR Spektroskopie beschraenkt. Mit dieser Methode lassen sich die energiereichen Phosphate ATP und

  8. Multiparametric and molecular imaging of breast tumors with MRI and PET/MRI; Multiparametrische und molekulare Bildgebung von Brusttumoren mit MRT und PET-MRT

    Energy Technology Data Exchange (ETDEWEB)

    Pinker, K. [Medizinische Universitaet Wien, Universitaetsklinik fuer Radiologie und Nuklearmedizin, Division fuer Molekulare und Gender Bildgebung, Wien (Austria); Memorial Sloan-Kettering Cancer Center, Department of Radiology, Molecular Imaging and Therapy Service, New York (United States); State University of Florida, Department of Scientific Computing in Medicine, Florida (United States); Marino, M.A. [Medizinische Universitaet Wien, Universitaetsklinik fuer Radiologie und Nuklearmedizin, Division fuer Molekulare und Gender Bildgebung, Wien (Austria); Policlinico Universitario G. Martino, University of Messina, Department of Biomedical Sciences and Morphologic and Functional Imaging, Messina (Italy); Meyer-Baese, A. [State University of Florida, Department of Scientific Computing in Medicine, Florida (United States); Helbich, T.H. [Medizinische Universitaet Wien, Universitaetsklinik fuer Radiologie und Nuklearmedizin, Division fuer Molekulare und Gender Bildgebung, Wien (Austria)

    2016-07-15

    Magnetic resonance imaging (MRI) of the breast is an indispensable tool in breast imaging for many indications. Several functional parameters with MRI and positron emission tomography (PET) have been assessed for imaging of breast tumors and their combined application is defined as multiparametric imaging. Available data suggest that multiparametric imaging using different functional MRI and PET parameters can provide detailed information about the hallmarks of cancer and may provide additional specificity. Multiparametric and molecular imaging of the breast comprises established MRI parameters, such as dynamic contrast-enhanced MRI, diffusion-weighted imaging (DWI), MR proton spectroscopy ({sup 1}H-MRSI) as well as combinations of radiological and MRI techniques (e.g. PET/CT and PET/MRI) using radiotracers, such as fluorodeoxyglucose (FDG). Multiparametric and molecular imaging of the breast can be performed at different field-strengths (range 1.5-7 T). Emerging parameters comprise novel promising techniques, such as sodium imaging ({sup 23}Na MRI), phosphorus spectroscopy ({sup 31}P-MRSI), chemical exchange saturation transfer (CEST) imaging, blood oxygen level-dependent (BOLD) and hyperpolarized MRI as well as various specific radiotracers. Multiparametric and molecular imaging has multiple applications in breast imaging. Multiparametric and molecular imaging of the breast is an evolving field that will enable improved detection, characterization, staging and monitoring for personalized medicine in breast cancer. (orig.) [German] Die Magnetresonanztomographie (MRT) der Brust ist ein etabliertes nichtinvasives bildgebendes Verfahren mit vielfaeltigen Indikationen. In den letzten Jahren wurden zahlreiche funktionelle MRT- und Positronenemissionstomographie(PET)-Parameter in der Brustbildgebung evaluiert, und ihre kombinierte Anwendung ist als multiparametrische Bildgebung definiert. Bisherige Daten legen nahe, dass die multiparametrische Bildgebung mit MRT und PET

  9. I. Synthesis, characterization, and base catalysis of novel zeolite supported super-basic materials II. Oxidative dehydrogenation of ethane over reduced heteropolyanion catalysts

    Science.gov (United States)

    Galownia, Jonathan M.

    This thesis is composed of two separate and unrelated projects. The first part of this thesis outlines an investigation into the synthesis and characterization of a novel zeolite supported super-base capable of carbon-carbon olefin addition to alkyl aromatics. A zeolite supported basic material capable of such reactions would benefit many fine chemical syntheses, as well as vastly improve the economics associated with production of the high performance thermoplastic polyester polyethylene naphthalate. The thermal decomposition of alkali---metal azides impregnated in zeolite X is investigated as a novel route to the synthesis of a zeolite supported super-base. Impregnation of the alkali---metal azide precursor is shown to result in azide species occluded within the pores of the zeolite support by using high speed, solid-state 23Na MAS and 2D MQMAS NMR, FTIR, and TGA characterization methods. Addition of alkali---metal azides to the zeolite results in redistribution of the extra-lattice cations in the zeolite framework. Thermal decomposition of impregnated azide species produces further cation redistribution, but no neutral metallic clusters are detected by high speed, solid-state 23Na MAS NMR following thermal activation of the materials. Instead, it is possible that inactive ionic clusters are formed. The thermally activated materials do not promote base catalysis for the isomerization of 1-butene, the ethylation of toluene and o-xylene, and the alkenylation of o-xylene with 1,3-butadiene to produce 5-ortho-tolyl-pent-2-ene (5-OTP). The lack of catalytic activity in the materials is attributed to failure of the materials to form neutral metallic clusters during thermal treatment, possibly due to preferential formation of NMR silent ionic clusters. The formation of neutral metallic clusters is found to be insensitive to synthesis technique and activation procedure. It is concluded that the impregnation of alkali---metal azides in zeolite X does not provide a

  10. Accelerated radioactive beams from REX-ISOLDE

    Energy Technology Data Exchange (ETDEWEB)

    Kester, O. E-mail: oliver.kester@physik.uni-muenchen.de; Sieber, T.; Emhofer, S.; Ames, F.; Reisinger, K.; Reiter, P.; Thirolf, P.G.; Lutter, R.; Habs, D.; Wolf, B.H.; Huber, G.; Schmidt, P.; Ostrowski, A.N.; Hahn, R. von; Repnow, R.; Fitting, J.; Lauer, M.; Scheit, H.; Schwalm, D.; Podlech, H.; Schempp, A.; Ratzinger, U.; Forstner, O.; Wenander, F.; Cederkaell, J.; Nilsson, T.; Lindroos, M.; Fynbo, H.; Franchoo, S.; Bergmann, U.; Oinonen, M.; Aeystoe, J.; Den Bergh, P. Van; Duppen, P. Van; Huyse, M.; Warr, N.; Weisshaar, D.; Eberth, J.; Jonson, B.; Nyman, G.; Pantea, M.; Simon, H.; Shrieder, G.; Richter, A.; Tengblad, O.; Davinson, T.; Woods, P.J.; Bollen, G.; Weissmann, L.; Liljeby, L.; Rensfelt, K.G

    2003-05-01

    In 2001 the linear accelerator of the Radioactive beam EXperiment (REX-ISOLDE) delivered for the first time accelerated radioactive ion beams, at a beam energy of 2 MeV/u. REX-ISOLDE uses the method of charge-state breeding, in order to enhance the charge state of the ions before injection into the LINAC. Radioactive singly-charged ions from the on-line mass separator ISOLDE are first accumulated in a Penning trap, then charge bred to an A/q<4.5 in an electron beam ion source (EBIS) and finally accelerated in a LINAC from 5 keV/u to energies between 0.8 and 2.2 MeV/u. Dedicated measurements with REXTRAP, the transfer line and the EBIS have been carried out in conjunction with the first commissioning of the accelerator. Thus the properties of the different elements could be determined for further optimization of the system. In two test beam times in 2001 stable and radioactive Na isotopes ({sup 23}Na-{sup 26}Na) have been accelerated and transmitted to a preliminary target station. There {sup 58}Ni- and {sup 9}Be- and {sup 2}H-targets have been used to study exited states via Coulomb excitation and neutron transfer reactions. One MINIBALL triple cluster detector was used together with a double sided silicon strip detector to detect scattered particles in coincidence with {gamma}-rays. The aim was to study the operation of the detector under realistic conditions with {gamma}-background from the {beta}-decay of the radioactive ions and from the cavities. Recently for efficient detection eight tripple Ge-detectors of MINIBALL and a double sided silicon strip detector have been installed. We will present the first results obtained in the commissioning experiments and will give an overview of realistic beam parameters for future experiments to be started in the spring 2002.

  11. Magnetic and dielectric properties of one-dimensional array of S = 1/2 linear trimer system Na{sub 2}Cu{sub 3}Ge{sub 4}O{sub 12}

    Energy Technology Data Exchange (ETDEWEB)

    Yasui, Yukio, E-mail: yyasui@meiji.ac.jp [Department of Physics, School of Science and Technology, Meiji University, Kawasaki 214-8571 (Japan); Department of Physics, Nagoya University, Nagoya 464-8602 (Japan); Kawamura, Yuji; Kobayashi, Yoshiaki [Department of Physics, Nagoya University, Nagoya 464-8602 (Japan); Sato, Masatoshi [Department of Physics, Nagoya University, Nagoya 464-8602 (Japan); Comprehensive Research Organization for Science and Society, Tokai 319-1106 (Japan)

    2014-05-07

    Magnetic susceptibility χ, specific heat C, capacitance C{sub p}, and {sup 23}Na-NMR measurements have been carried out on polycrystalline samples of quantum spin linear trimer system Na{sub 2}Cu{sub 3}Ge{sub 4}O{sub 12}, which has the one-dimensional array of Cu{sub 3}O{sub 8} trimers formed of edge-sharing three CuO{sub 4} square planes. The exchange interactions between the Cu{sup 2+} (S = 1/2) spins have been determined by analyzing χ-T and C-T curves. By employing the isolated S = 1/2 Heisenberg trimer model above 70 K, the nearest-neighbor exchange couplings J{sub 1} and the second-neighbor one J{sub 2} in trimer have been evaluated to J{sub 1}/k{sub B} = 30 ± 20 K (antiferromagnetic) and J{sub 2}/k{sub B} = 340 ± 20 K. At low temperature region, two spins of the edge in the Cu{sub 3}O{sub 8} trimers form a nonmagnetic singlet by strong antiferromagnetic interaction J{sub 2}, and the spin left in the center of the Cu{sub 3}O{sub 8} trimer forms one-dimensional chains by the exchange interaction J{sub 3} between the trimers. By employing the S = 1/2 uniform Heisenberg chain model below 70 K, we have evaluated to J{sub 3}/k{sub B} = 18 ± 1 K. The mechanism of multiferroic behavior at T{sub c} = 2 K is discussed.

  12. Tolerance to salinity in Cucumis with neutron activation and autoradiography of sodium in seedlings of selected species of the genus

    Energy Technology Data Exchange (ETDEWEB)

    Lathrop, B.L.

    1985-01-01

    Part I. Nineteen species of Cucumis were compared for tolerance to sodium chloride in solution and sand culture. C. sativus L., and C. hardwickii died at 270 meq/I NaCl, while C. melo L. can tolerate up to 340 meq/I. C. myriocarpus, C. ficifolius, C. membranifolius, and C. meeusii are the most tolerant, surviving up to about 500 meq/I NaCl. The initial response of all species to gradually increasing levels of salinization is a bluish-green deepening of foliage color and reduction in growth, followed by intervenal chlorosis of older leaves and more pronounced chlorosis of new growth. Death occurred first in the mesic species in about 12-18 days and was characterized by general wilting and necrosis. In more tolerant species which were generally more xeric and woody, death occurred in about 18-28 days as the leaf blades became necrotic on wilted petioles. Part II. A cyclotron generated proton beam was used to induce a high density thermal neutron flux from a NaI target for conversion of /sup 23/Na/sup 24/ to Na in living and dried seedlings of Cucumis sativus (sensitive to salinity) and C. myriocarpus (tolerant). There was little difference in movement of salt in the living seedlings of the cultivated and wild species of Cucumis during a 10 hour period following neutron activation and before autoradiography. Some suggestion of transport of Na in main vascular bundles occurred during this period in C. myriocarpus. The creation of /sup 24/Na in air-dried seedlings of this taxon that had been salinized also permitted autoradiography of sodium distribution and provided results similar to in vivo studies.

  13. Charge breeding results and future prospects with electron cyclotron resonance ion source and electron beam ion source (invited).

    Science.gov (United States)

    Vondrasek, R; Levand, A; Pardo, R; Savard, G; Scott, R

    2012-02-01

    The Californium Rare Ion Breeder Upgrade (CARIBU) of the Argonne National Laboratory ATLAS facility will provide low-energy and reaccelerated neutron-rich radioactive beams for the nuclear physics program. A 70 mCi (252)Cf source produces fission fragments which are thermalized and collected by a helium gas catcher into a low-energy particle beam with a charge of 1+ or 2+. An electron cyclotron resonance (ECR) ion source functions as a charge breeder in order to raise the ion charge sufficiently for acceleration in the ATLAS linac. The final CARIBU configuration will utilize a 1 Ci (252)Cf source to produce radioactive beams with intensities up to 10(6) ions∕s for use in the ATLAS facility. The ECR charge breeder has been tested with stable beam injection and has achieved charge breeding efficiencies of 3.6% for (23)Na(8+), 15.6% for (84)Kr(17+), and 13.7% for (85)Rb(19+) with typical breeding times of 10 ms∕charge state. For the first radioactive beams, a charge breeding efficiency of 11.7% has been achieved for (143)Cs(27+) and 14.7% for (143)Ba(27+). The project has been commissioned with a radioactive beam of (143)Ba(27+) accelerated to 6.1 MeV∕u. In order to take advantage of its lower residual contamination, an EBIS charge breeder will replace the ECR charge breeder in the next two years. The advantages and disadvantages of the two techniques are compared taking into account the requirements of the next generation radioactive beam facilities.

  14. Sugar-influenced water diffusion, interaction, and retention in clay interlayer nanopores probed by theoretical simulations and experimental spectroscopies

    Science.gov (United States)

    Aristilde, Ludmilla; Galdi, Stephen M.; Kelch, Sabrina E.; Aoki, Thalia G.

    2017-08-01

    Understanding the hydrodynamics in clay nanopores is important for gaining insights into the trapping of water, nutrients, and contaminants in natural and engineered soils. Previous investigations have focused on the interlayer organization and molecular diffusion coefficients (D) of cations and water molecules in cation-saturated interlayer nanopores of smectite clays. Little is known, however, about how these interlayer dynamic properties are influenced by the ubiquitous presence of small organic compounds such as sugars in the soil environment. Here we probed the effects of glucose molecules on montmorillonite interlayer properties. Molecular dynamics simulations revealed re-structuring of the interlayer organization of the adsorptive species. Water-water interactions were disrupted by glucose-water H-bonding interactions. ;Dehydration; of the glucose-populated nanopore led to depletion in the Na solvation shell, which resulted in the accumulation of both Na ions (as inner-sphere complexes) and remaining hydrated water molecules at the mineral surface. This accumulation led to a decrease in both DNa and Dwater. In addition, the reduction in Dglucose as a function of increasing glucose content can be explained by the aggregation of glucose molecules into organic clusters H-bonded to the mineral surface on both walls of the nanopore. Experimental nuclear magnetic resonance and X-ray diffraction data were consistent with the theoretical predictions. Compared to clay interlayers devoid of glucose, increased intensities and new peaks in the 23Na nuclear magnetic resonance spectra confirmed increasing immobilization of Na as a function of increasing glucose content. And, the X-ray diffraction data indicated a reduced collapse of glucose-populated interlayers exposed to decreasing moisture conditions, which led to the maintenance of hydrated clay nanopores. The coupling of theoretical and experimental findings sheds light on the molecular to nanoscale mechanisms that

  15. Phase equilibria in the NaF-CdO-NaPO3 system at 873 K and crystal structure and physico-chemical characterizations of the new Na2CdPO4F fluorophosphate

    Science.gov (United States)

    Aboussatar, Mohamed; Mbarek, Aïcha; Naili, Houcine; El-Ghozzi, Malika; Chadeyron, Geneviève; Avignant, Daniel; Zambon, Daniel

    2017-04-01

    Isothermal sections of the diagram representing phase relationships in the NaF-CdO-NaPO3 system have been investigated by solid state reactions and powder X-ray diffraction. This phase diagram investigation confirms the polymorphism of the NaCdPO4 side component and the structure of the ß high temperature polymorph (orthorhombic, space group Pnma and unit cell parameters a=9.3118(2), b=7.0459(1), c=5.1849(1) Å has been refined. A new fluorophosphate, Na2CdPO4F, has been discovered and its crystal structure determined and refined from powder X-ray diffraction data. It exhibits a new 3D structure with orthorhombic symmetry, space group Pnma and unit cell parameters a=5.3731(1), b=6.8530(1), c=12.2691(2) Å. The structure is closely related to those of the high temperature polymorph of the nacaphite Na2CaPO4F and the fluorosilicate Ca2NaSiO4F but differs essentially in the cationic repartition since the structure is fully ordered with one Na site (8d) and one Cd site (4c). Relationships with other Na2MIIPO4F (MII=Mg, Ca, Mn, Fe, Co, Ni) have been examined and the crystal-chemical and topographical analysis of these fluorophosphates is briefly reviewed. IR, Raman, optical and 19F, 23Na, 31P MAS NMR characterizations of Na2CdPO4F have been investigated.

  16. Kagome fiber based ultrafast laser microsurgery probe delivering micro-Joule pulse energies.

    Science.gov (United States)

    Subramanian, Kaushik; Gabay, Ilan; Ferhanoğlu, Onur; Shadfan, Adam; Pawlowski, Michal; Wang, Ye; Tkaczyk, Tomasz; Ben-Yakar, Adela

    2016-11-01

    We present the development of a 5 mm, piezo-actuated, ultrafast laser scalpel for fast tissue microsurgery. Delivery of micro-Joules level energies to the tissue was made possible by a large, 31 μm, air-cored inhibited-coupling Kagome fiber. We overcome the fiber's low NA by using lenses made of high refractive index ZnS, which produced an optimal focusing condition with 0.23 NA objective. The optical design achieved a focused laser spot size of 4.5 μm diameter covering a 75 × 75 μm(2) scan area in a miniaturized setting. The probe could deliver the maximum available laser power, achieving an average fluence of 7.8 J/cm(2) on the tissue surface at 62% transmission efficiency. Such fluences could produce uninterrupted, 40 μm deep cuts at translational speeds of up to 5 mm/s along the tissue. We predicted that the best combination of speed and coverage exists at 8 mm/s for our conditions. The onset of nonlinear absorption in ZnS, however, limited the probe's energy delivery capabilities to 1.4 μJ for linear operation at 1.5 picosecond pulse-widths of our fiber laser. Alternatives like broadband CaF2 crystals should mitigate such nonlinear limiting behavior. Improved opto-mechanical design and appropriate material selection should allow substantially higher fluence delivery and propel such Kagome fiber-based scalpels towards clinical translation.

  17. Structure and Dynamics of Nonionic Surfactant Aggregates in Layered Materials.

    Science.gov (United States)

    Guégan, Régis; Veron, Emmanuel; Le Forestier, Lydie; Ogawa, Makoto; Cadars, Sylvian

    2017-09-26

    The aggregation of surfactants on solid surfaces as they are adsorbed from solution is the basis of numerous technological applications such as colloidal stabilization, ore flotation, and floor cleaning. The understanding of both the structure and the dynamics of surfactant aggregates applies to the development of alternative ways of preparing hybrid layered materials. For this purpose, we study the adsorption of the triethylene glycol mono n-decyl ether (C10E3) nonionic surfactant onto a synthetic montmorillonite (Mt), an aluminosilicate clay mineral for organoclay preparation with important applications in materials sciences, catalysis, wastewater treatment, or as drug delivery. The aggregation mechanisms follow those observed in an analogous natural Mt, with the condensation of C10E3 in a bilayer arrangement once the surfactant self-assembles in a lamellar phase beyond the critical micelle concentration, underlining the importance of the surfactant state in solution. Solid-state (1)H nuclear magnetic resonance (NMR) at fast magic-angle spinning (MAS) and high magnetic field combined with(1)H-(13)C correlation experiments and different types of (13)C NMR experiments selectively probes mobile or rigid moieties of C10E3 in three different aggregate organizations: (i) a lateral monolayer, (ii) a lateral bilayer, and (iii) a normal bilayer. High-resolution (1)H{(27)Al} CP-(1)H-(1)H spin diffusion experiments shed light on the proximities and dynamics of the different fragments and fractions of the intercalated surfactant molecules with respect to the Mt surface. (23)Na and (1)H NMR measurements combined with complementary NMR data, at both molecular and nanometer scales, precisely pointed out the location of the C10E3 ethylene oxide hydrophilic group in close contact with the Mt surface interacting through ion-dipole or van der Waals interactions.

  18. Subcellular SIMS imaging of isotopically labeled amino acids in cryogenically prepared cells

    Energy Technology Data Exchange (ETDEWEB)

    Chandra, Subhash

    2004-06-15

    Ion microscopy is a potentially powerful technique for localization of isotopically labeled molecules. In this study, L-arginine and phenylalanine amino acids labeled with stable isotopes {sup 13}C and {sup 15}N were localized in cultured cells with the ion microscope at 500 nm spatial resolution. Cells were exposed to the labeled amino acids and cryogenically prepared. SIMS analyses were made in fractured freeze-dried cells. A dynamic distribution was observed from labeled arginine-treated LLC-PK{sub 1} kidney cells at mass 28 ({sup 13}C{sup 15}N) in negative secondaries, revealing cell-to-cell heterogeneity and preferential accumulation of the amino acid (or its metabolite) in the nucleus and nucleolus of some cells. The smaller nucleolus inside the nucleus was clearly resolved in SIMS images and confirmed by correlative light microscopy. The distribution of labeled phenylalanine contrasted with arginine as it was rather homogeneously distributed in T98G human glioblastoma cells. Images of {sup 39}K, {sup 23}Na and {sup 40}Ca were also recorded to confirm the reliability of sample preparation and authenticity of the observed amino acid distributions. These observations indicate that SIMS techniques can provide a valuable technology for subcellular localization of nitrogen-containing molecules in proteomics since nitrogen does not have a radionuclide tracer isotope. Amino acids labeled with stable isotopes can be used as tracers for studying their transport and metabolism in distinct subcellular compartments with SIMS. Further studies of phenylalanine uptake in human glioblastoma cells may have special significance in boron neutron capture therapy (BNCT) as a boron analogue of phenylalanine, boronophenylalanine is a clinically approved compound for the treatment of brain tumors.

  19. Subcellular SIMS imaging of isotopically labeled amino acids in cryogenically prepared cells

    Science.gov (United States)

    Chandra, Subhash

    2004-06-01

    Ion microscopy is a potentially powerful technique for localization of isotopically labeled molecules. In this study, L-arginine and phenylalanine amino acids labeled with stable isotopes 13C and 15N were localized in cultured cells with the ion microscope at 500 nm spatial resolution. Cells were exposed to the labeled amino acids and cryogenically prepared. SIMS analyses were made in fractured freeze-dried cells. A dynamic distribution was observed from labeled arginine-treated LLC-PK 1 kidney cells at mass 28 ( 13C15N) in negative secondaries, revealing cell-to-cell heterogeneity and preferential accumulation of the amino acid (or its metabolite) in the nucleus and nucleolus of some cells. The smaller nucleolus inside the nucleus was clearly resolved in SIMS images and confirmed by correlative light microscopy. The distribution of labeled phenylalanine contrasted with arginine as it was rather homogeneously distributed in T98G human glioblastoma cells. Images of 39K, 23Na and 40Ca were also recorded to confirm the reliability of sample preparation and authenticity of the observed amino acid distributions. These observations indicate that SIMS techniques can provide a valuable technology for subcellular localization of nitrogen-containing molecules in proteomics since nitrogen does not have a radionuclide tracer isotope. Amino acids labeled with stable isotopes can be used as tracers for studying their transport and metabolism in distinct subcellular compartments with SIMS. Further studies of phenylalanine uptake in human glioblastoma cells may have special significance in boron neutron capture therapy (BNCT) as a boron analogue of phenylalanine, boronophenylalanine is a clinically approved compound for the treatment of brain tumors.

  20. The aluminium effect on the structure of silico-phosphate glasses studied by NMR and FTIR

    Science.gov (United States)

    Sitarz, Maciej; Fojud, Zbigniew; Olejniczak, Zbigniew

    2009-04-01

    Silico-phosphate glasses of NaCaPO 4-SiO 2 and NaCaPO 4-AlPO 4-SiO 2 system have been the subject of the presented investigations. Glasses of these systems are the basis for the preparation of glassy-crystalline biomaterials [R.D. Rawlings, Clin. Mater. 14 (1993) 155]. Detailed knowledge of the precursor glass structure is necessary for proper design of the glassy-crystalline biomaterials preparation procedure. Since there is no long-range ordering in glasses, spectroscopic methods which make it possible to study the short range ordering should be applied. MIR studies carried out in the work have allowed to establish that the glasses of the systems studied show domain composition [L.L. Hench, R.J. Splinter, T.K. Greenlee, W.C. Allen, J. Biol. Res. Symp. 2 (1971) 117; L.L. Hench, R.J. Splinter, W.C. Allen, T.K. Greenlee, J. Biol. Res. 5 (1972) 117]. Domain structure is close to that of the corresponding crystalline phases. It has been shown that even small amount of aluminium in the glass (5 mol.% of AlPO 4) significantly influences both, its texture (microscopic and EDX studies) and its structure (spectroscopic studies). 27Al NMR investigations have made it possible to establish unequivocally that aluminium occurs exclusively in tetrahedral coordination, i.e. it is involved in the formation of glass framework. Presence of aluminium results in significant changes in the [SiO 4] 4- and [PO 4] 3- tetrahedra environment which is reflected in 23Na, 31P and 29Si NMR spectra. Changes in the shapes and positions of the bands in the NMR spectra of glasses belonging to the NaCaPO 4-AlPO 4-SiO 2 system confirm great influence of aluminium on silico-phosphate glasses structure.

  1. Neutron Cross Section Covariances for Structural Materials and Fission Products

    Science.gov (United States)

    Hoblit, S.; Cho, Y.-S.; Herman, M.; Mattoon, C. M.; Mughabghab, S. F.; Obložinský, P.; Pigni, M. T.; Sonzogni, A. A.

    2011-12-01

    We describe neutron cross section covariances for 78 structural materials and fission products produced for the new US evaluated nuclear reaction library ENDF/B-VII.1. Neutron incident energies cover full range from 10 eV to 20 MeV and covariances are primarily provided for capture, elastic and inelastic scattering as well as (n,2n). The list of materials follows priorities defined by the Advanced Fuel Cycle Initiative, the major application being data adjustment for advanced fast reactor systems. Thus, in addition to 28 structural materials and 49 fission products, the list includes also 23Na which is important fast reactor coolant. Due to extensive amount of materials, we adopted a variety of methodologies depending on the priority of a specific material. In the resolved resonance region we primarily used resonance parameter uncertainties given in Atlas of Neutron Resonances and either applied the kernel approximation to propagate these uncertainties into cross section uncertainties or resorted to simplified estimates based on integral quantities. For several priority materials we adopted MF32 covariances produced by SAMMY at ORNL, modified by us by adding MF33 covariances to account for systematic uncertainties. In the fast neutron region we resorted to three methods. The most sophisticated was EMPIRE-KALMAN method which combines experimental data from EXFOR library with nuclear reaction modeling and least-squares fitting. The two other methods used simplified estimates, either based on the propagation of nuclear reaction model parameter uncertainties or on a dispersion analysis of central cross section values in recent evaluated data files. All covariances were subject to quality assurance procedures adopted recently by CSEWG. In addition, tools were developed to allow inspection of processed covariances and computed integral quantities, and for comparing these values to data from the Atlas and the astrophysics database KADoNiS.

  2. Neutron Cross Section Covariances for Structural Materials and Fission Products

    Energy Technology Data Exchange (ETDEWEB)

    Hoblit, S.; Hoblit,S.; Cho,Y.-S.; Herman,M.; Mattoon,C.M.; Mughabghab,S.F.; Oblozinsky,P.; Pigni,M.T.; Sonzogni,A.A.

    2011-12-01

    We describe neutron cross section covariances for 78 structural materials and fission products produced for the new US evaluated nuclear reaction library ENDF/B-VII.1. Neutron incident energies cover full range from 10{sup -5} eV to 20 MeV and covariances are primarily provided for capture, elastic and inelastic scattering as well as (n,2n). The list of materials follows priorities defined by the Advanced Fuel Cycle Initiative, the major application being data adjustment for advanced fast reactor systems. Thus, in addition to 28 structural materials and 49 fission products, the list includes also {sup 23}Na which is important fast reactor coolant. Due to extensive amount of materials, we adopted a variety of methodologies depending on the priority of a specific material. In the resolved resonance region we primarily used resonance parameter uncertainties given in Atlas of Neutron Resonances and either applied the kernel approximation to propagate these uncertainties into cross section uncertainties or resorted to simplified estimates based on integral quantities. For several priority materials we adopted MF32 covariances produced by SAMMY at ORNL, modified by us by adding MF33 covariances to account for systematic uncertainties. In the fast neutron region we resorted to three methods. The most sophisticated was EMPIRE-KALMAN method which combines experimental data from EXFOR library with nuclear reaction modeling and least-squares fitting. The two other methods used simplified estimates, either based on the propagation of nuclear reaction model parameter uncertainties or on a dispersion analysis of central cross section values in recent evaluated data files. All covariances were subject to quality assurance procedures adopted recently by CSEWG. In addition, tools were developed to allow inspection of processed covariances and computed integral quantities, and for comparing these values to data from the Atlas and the astrophysics database KADoNiS.

  3. Use of multiple-locus variable-number of tandem repeats analysis (MLVA) to investigate genetic diversity of Salmonella enterica subsp. enterica serovar Typhimurium isolates from human, food, and veterinary sources.

    Science.gov (United States)

    Mateva, Gergana; Pedersen, Karl; Sørensen, Gitte; Asseva, Galina; Daskalov, Hristo; Petrov, Petar; Kantardjiev, Todor; Alexandar, Irina; Löfström, Charlotta

    2017-08-23

    Salmonella enterica subspecies enterica serovar Typhimurium is the most common zoonotic pathogen in Bulgaria. To allow efficient outbreak investigations and surveillance in the food chain, accurate and discriminatory methods for typing are needed. This study evaluated the use of multiple-locus variable-number of tandem repeats analysis (MLVA) and compared results with antimicrobial resistance (AMR) determinations for 100 S. Typhimurium strains isolated in Bulgaria during 2008-2012 (50 veterinary/food and 50 human isolates). Results showed that isolates were divided into 80 and 34 groups using MLVA and AMR, respectively. Simpson's index of diversity was determined to 0.994 ± 0.003 and 0.945 ± 0.012. The most frequently encountered MLVA profiles were 3-11-9-NA-211 (n = 5); 3-12-9-NA-211 (n = 3); 3-12-11-21-311 (n = 3); 3-17-10-NA-311 (n = 3); 2-20-9-7-212 (n = 3); and 2-23-NA-NA-111 (n = 3). No clustering of isolates related to susceptibility/resistance to antimicrobials, source of isolation, or year of isolation was observed. Some MLVA types were found in both human and veterinary/food isolates, indicating a possible route of transmission. A majority (83%) of the isolates were found to be resistant against at least one antimicrobial and 44% against ≥4 antimicrobials. Further studies are needed to verify MLVA usefulness over a longer period of time and with more isolates, including outbreak strains. © 2017 The Authors. MicrobiologyOpen published by John Wiley & Sons Ltd.

  4. Kagome fiber based ultrafast laser microsurgery probe delivering micro-Joule pulse energies

    Science.gov (United States)

    Subramanian, Kaushik; Gabay, Ilan; Ferhanoğlu, Onur; Shadfan, Adam; Pawlowski, Michal; Wang, Ye; Tkaczyk, Tomasz; Ben-Yakar, Adela

    2016-01-01

    We present the development of a 5 mm, piezo-actuated, ultrafast laser scalpel for fast tissue microsurgery. Delivery of micro-Joules level energies to the tissue was made possible by a large, 31 μm, air-cored inhibited-coupling Kagome fiber. We overcome the fiber’s low NA by using lenses made of high refractive index ZnS, which produced an optimal focusing condition with 0.23 NA objective. The optical design achieved a focused laser spot size of 4.5 μm diameter covering a 75 × 75 μm2 scan area in a miniaturized setting. The probe could deliver the maximum available laser power, achieving an average fluence of 7.8 J/cm2 on the tissue surface at 62% transmission efficiency. Such fluences could produce uninterrupted, 40 μm deep cuts at translational speeds of up to 5 mm/s along the tissue. We predicted that the best combination of speed and coverage exists at 8 mm/s for our conditions. The onset of nonlinear absorption in ZnS, however, limited the probe’s energy delivery capabilities to 1.4 μJ for linear operation at 1.5 picosecond pulse-widths of our fiber laser. Alternatives like broadband CaF2 crystals should mitigate such nonlinear limiting behavior. Improved opto-mechanical design and appropriate material selection should allow substantially higher fluence delivery and propel such Kagome fiber-based scalpels towards clinical translation. PMID:27896003

  5. A Cylindrical Shielding Design Concept for the Prototype Gen-IV Sodium-cooled Fast Reactor

    Energy Technology Data Exchange (ETDEWEB)

    Yun, Sunghwan; Kim, Sang Ji [Korea Atomic Energy Research Institute, Daejeon (Korea, Republic of)

    2014-05-15

    In the Prototype Gen-IV Sodium-cooled Fast Reactor (PGSFR), a metal fueled, blanket-free, pool type SFR concept is adopted to acquire the inherent safety characteristics and high proliferation-resistance. In the pool type fast reactor, the intermediate heat exchangers (IHXs), which transfer heat from the primary sodium pool to a secondary sodium loop, are placed inside of the reactor vessel. Hence, secondary sodium passing the IHXs can be radioactivated by a {sup 23}Na(n,g){sup 24}Na reaction, and radioactivated secondary sodium causes a significant dose in the Steam Generator Building (SGB). Therefore, a typical core of a pool type fast reactor is usually surrounded by a massive quantity of shields. In addition, the blanket composed of depleted uranium plays a role as superior shielding material; a significant increase in shields is required in the blanket-free pool type SFR. In this paper, a new cylindrical shielding design concept is proposed for a blanket-free pool type SFR. In a conventional shielding design, massive axial shields are required to prevent irradiation of secondary sodium passing IHXs and they should be replaced according to the subassembly replacement in spite of negligible depletion of the shielding material. The proposed shielding design concept minimizes the quantity of shields without their replacement. In this paper, a new cylindrical shielding design concept is proposed for a blanket-free pool type SFR such as a PGSFR. The proposed design concept satisfied the dose limit in the steam generator building successfully without introducing a large quantity of B{sub 4}C shielding inside the subassembly.

  6. Processing Neutron Cross Section Covariances using NJOY-99 and PUFF-IV

    Energy Technology Data Exchange (ETDEWEB)

    Arcilla,R.; Kahler, A.C.; Oblozinsky, P.; Herman, M.

    2008-06-24

    With the growing demand for multigroup covariances, the National Nuclear Data Center (NNDC) has been experiencing an upsurge in its covariance data processing activities using the two US codes NJOY-99 (LANL) and PUFF-IV (ORNL). The code NJOY-99 was upgraded by incorporating the new module ERRORJ-2.3, while the NNDC served as the active user and provided feedback. The NNDC has been primarily processing neutron cross section covariances on its 64-bit Linux cluster in support of two DOE programs, the Global Nuclear Energy Partnership (GNEP) and the Nuclear Criticality Safety Program (NCSP). For GNEP, the NNDC used NJOY-99.259 to generate multigroup covariance matrices of {sup 56}Fe, {sup 23}Na, {sup 239}Pu, {sup 235}U and {sup 238}U from the JENDL-3.3 library using the 15-, 33-, and 230-energy group structures. These covariance matrices will be used to test a new collapsing algorithm which will subsequently be employed to calculate uncertainties on integral parameters in different fast neutron-based systems. For NCSP, we used PUFF-IV 1.0.4 to verify the processability of new evaluated covariance data of {sup 55}Mn, {sup 239}Pu, {sup 233}U, {sup 235}U and {sup 238}U generated by a collaboration of ORNL and LANL. For the data end-users at large, the NNDC has made available a Web site which provides a static visualization interface for all materials with covariance data in the four major data libraries: ENDF/B-VI.8 (47 materials), ENDF/B-VII.0 (26 materials), JEFF-3.1 (37 materials) and JENDL-3.3 (20 materials).

  7. On the quantum information processing in nuclear magnetic resonance quantum computing experiments

    Energy Technology Data Exchange (ETDEWEB)

    Azevedo, E.R. de; Bonk, F.A.; Vidoto, E.L.G.; Bonagamba, T.J. [Universidade de Sao Paulo (IFSC/USP), Sao Carlos, SP (Brazil). Inst. de Fisica; Sarthour, R.S.; Guimaraes, A.P.; Oliveira, I.S. [Centro Brasileiro de Pesquisas Fisicas (CBPF), Rio de Janeiro, RJ (Brazil); Freitas, J.C.C. [Universidade Federal do Espirito Santo (UFES), Vitoria, ES (Brazil). Dept. de Fisica

    2003-07-01

    Full text: Nuclear Magnetic Resonance appeared in the late nineties to be the most promising candidate to run quantum computing algorithms. An impressive number of experiments demonstrating the implementation of all logic gates and quantum algorithms in systems with a small number of qubits stimulated the general excitement about the technique, and greatly promoted the field. Particularly important were those experiments where entanglement of particles were aimed at. Entanglement is the most fundamental (and weird !) aspect of quantum systems, and is at the basis of quantum teleportation and quantum cryptography, yet impossible to prove in NMR experiments. The hardcore of NMR quantum computing are the so-called pseudo-pure states, upon which radiofrequency (RF) pulses act to implement quantum mechanical unitary transformations, promoting changes in both, Zeeman level populations and coherences in the density matrix. Whereas pseudo-pure states are special non-equilibrium diagonal states, coherences encode information about superposition states. Now, one could safely say that the whole business of quantum computing goes about controlling relative ket phases. In spite of the impossibility to univocally associating a given quantum state to a NMR spectrum, it is possible to demonstrate the phase action of RF pulses over relative ket phases, even if no population changes take place. In this talk these issues will be addressed, and we will show experimental results of our own where this is done in the two-qubit quadrupole nuclei {sup 23}Na in C{sub 10}H{sub 21}NaO{sub 4}S liquid crystal. We demonstrate the reversibility of the Hadamard gate, and of a quantum circuit which generates pseudo-Bell states. The success of the operation reaches almost 100% in the case of the state |01+|10, 80% in the cases of |00> + |01> and |10> + |11>, and 65% for the cat-state |00> + |11>. (author)

  8. Spin-locking of half-integer quadrupolar nuclei in nuclear magnetic resonance of solids: creation and evolution of coherences.

    Science.gov (United States)

    Ashbrook, Sharon E; Wimperis, Stephen

    2004-02-08

    Spin-locking of half-integer quadrupolar nuclei, such as 23Na (I=3/2) and 27Al (I=5/2), is of renewed interest owing to the development of variants of the multiple-quantum and satellite-transition magic angle spinning (MAS) nuclear magnetic resonance experiments that either utilize spin-locking directly or offer the possibility that spin-locked states may arise. However, the large magnitude and, under MAS, the time dependence of the quadrupolar interaction often result in complex spin-locking phenomena that are not widely understood. Here we show that, following the application of a spin-locking pulse, a variety of coherence transfer processes occur on a time scale of approximately 1/omegaQ before the spin system settles down into a spin-locked state which may itself be time dependent if MAS is performed. We show theoretically for both spin I=3/2 and 5/2 nuclei that the spin-locked state created by this initial rapid dephasing typically consists of a variety of single- and multiple-quantum coherences and nonequilibrium population states and we discuss the subsequent evolution of these under MAS. In contrast to previous work, we consider spin-locking using a wide range of radio frequency field strengths, i.e., a range that covers both the "strong-field" (omega1 > omegaQPAS and "weak-field" (omega1 spin-locking experiments on NaNO2, NaNO3, and Al(acac)3, under both static and MAS conditions, are used to illustrate and confirm the results of the theoretical discussion.

  9. Phase evolution of Na2O-Al2O3-SiO2-H2O gels in synthetic aluminosilicate binders.

    Science.gov (United States)

    Walkley, Brant; San Nicolas, Rackel; Sani, Marc-Antoine; Gehman, John D; van Deventer, Jannie S J; Provis, John L

    2016-04-07

    This study demonstrates the production of stoichiometrically controlled alkali-aluminosilicate gels ('geopolymers') via alkali-activation of high-purity synthetic amorphous aluminosilicate powders. This method provides for the first time a process by which the chemistry of aluminosilicate-based cementitious materials may be accurately simulated by pure synthetic systems, allowing elucidation of physicochemical phenomena controlling alkali-aluminosilicate gel formation which has until now been impeded by the inability to isolate and control key variables. Phase evolution and nanostructural development of these materials are examined using advanced characterisation techniques, including solid state MAS NMR spectroscopy probing (29)Si, (27)Al and (23)Na nuclei. Gel stoichiometry and the reaction kinetics which control phase evolution are shown to be strongly dependent on the chemical composition of the reaction mix, while the main reaction product is a Na2O-Al2O3-SiO2-H2O type gel comprised of aluminium and silicon tetrahedra linked via oxygen bridges, with sodium taking on a charge balancing function. The alkali-aluminosilicate gels produced in this study constitute a chemically simplified model system which provides a novel research tool for the study of phase evolution and microstructural development in these systems. Novel insight of physicochemical phenomena governing geopolymer gel formation suggests that intricate control over time-dependent geopolymer physical properties can be attained through a careful precursor mix design. Chemical composition of the main N-A-S-H type gel reaction product as well as the reaction kinetics governing its formation are closely related to the Si/Al ratio of the precursor, with increased Al content leading to an increased rate of reaction and a decreased Si/Al ratio in the N-A-S-H type gel. This has significant implications for geopolymer mix design for industrial applications.

  10. Atividade da torta de nim sobre adultos do cascudinho dos aviários em condições de laboratório Activity of neem cake on adults of the lesser mealworm in laboratory

    Directory of Open Access Journals (Sweden)

    Victor Michelon Alves

    2012-05-01

    Full Text Available O cascudinho dos aviários é considerado um importante problema mundial no sistema de produção avícola, por infestar os aviários e ser potencial vetor de patógenos às aves e ao ser humano. O objetivo do trabalho foi avaliar em laboratório a atividade da torta de nim, Azadirachta indica A. Juss (Meliaceae como forma alternativa de controle de Alphitobius diaperinus Panzer (Coleoptera: Tenebrionidae. A torta foi aplicada diretamente no substrato (ração para aves ou cama de aviário na quantidade de 100g m-2 do produto. Foram verificados os efeitos letais e subletais da torta contra adultos do cascudinho dos aviários, sendo eles: ação inseticida, efeito na oviposição, repelência e efeito na alimentação. A utilização de torta de nim pareceu não afetar a sobrevivência dos insetos, porém, a avaliação do efeito repelente, atividade alimentar e oviposição foram influenciados, sendo observada redução de 23% na oviposição e 21% na atividade alimentar.The lesser mealworm is one the most important problem to avian production system, being a potential vector of avian and other animal pathogens. The objective of this study was to evaluate the neem cake (Azadirachta indica A. Juss (Meliaceae as an alternative to control the Alphitobius diaperinus Panzer (Coleoptera: Tenebrionidae. The neem cake was directly applied to substrates at 100g m-2 and were evaluated the lethal and sublethal effects to A. diaperinus adults, as mortality, oviposition, repellent effect and feeding. There was no effect on adult mortality, but were observed reduction of the oviposition (23%, repellent effect, and reduction of insect feeding (21%.

  11. Functional Differentiation of Antiporter-Like Polypeptides in Complex I; a Site-Directed Mutagenesis Study of Residues Conserved in MrpA and NuoL but Not in MrpD, NuoM, and NuoN.

    Directory of Open Access Journals (Sweden)

    Eva Sperling

    Full Text Available It has long been known that the three largest subunits in the membrane domain (NuoL, NuoM and NuoN of complex I are homologous to each other, as well as to two subunits (MrpA and MrpD from a Na+/H+ antiporter, Mrp. MrpA and NuoL are more similar to each other and the same is true for MrpD and NuoN. This suggests a functional differentiation which was proven experimentally in a deletion strain model system, where NuoL could restore the loss of MrpA, but not that of MrpD and vice versa. The simplest explanation for these observations was that the MrpA and MrpD proteins are not antiporters, but rather single subunit ion channels that together form an antiporter. In this work our focus was on a set of amino acid residues in helix VIII, which are only conserved in NuoL and MrpA (but not in any of the other antiporter-like subunits. and to compare their effect on the function of these two proteins. By combining complementation studies in B. subtilis and 23Na-NMR, response of mutants to high sodium levels were tested. All of the mutants were able to cope with high salt levels; however, all but one mutation (M258I/M225I showed differences in the efficiency of cell growth and sodium efflux. Our findings showed that, although very similar in sequence, NuoL and MrpA seem to differ on the functional level. Nonetheless the studied mutations gave rise to interesting phenotypes which are of interest in complex I research.

  12. Microhardness of dentin underneath fluoride-releasing adhesive systems subjected to cariogenic challenge and fluoride therapy.

    Science.gov (United States)

    Kirsten, Giovanna A; Takahashi, Marcos Kenzo; Rached, Rodrigo N; Giannini, Marcelo; Souza, Evelise M

    2010-06-01

    The aim of this study was to evaluate the microhardness of dentin subjacent to the bonding interface of composite restorations using fluoride-releasing adhesive systems submitted to pH-cycling regimen associated or not to fluoride therapies. Thirty human third molars were prepared with class V cavities with dentin cervical margins. The adhesive systems One-Up Bond F Plus (OU), Prime&Bond NT (NT), Clearfil Protect Bond (CF), Optibond Solo Plus (OP) and also the controls [-] Single Bond 2 (SB) and [+] Ketac Molar (KM) were used previously to composite resin restorations. The restorations were sectioned into four slabs and submitted to different storage media for 15 days: distilled water, pH-cycling, pH-cycling associated to NaF 0.05% and associated to NaF 1.23%. The Knoop microhardness test was performed in dentin at 50, 100, 150 and 300 microm from the adhesive interface. Data was analyzed by three-way ANOVA and Tukey HSD test (p<0.05). KM resulted in significantly higher microhardness when compared to all the adhesive systems at 50 microm, with the exception of OU, that was similar to KM when submitted to pH-cycling alone or associated to 1.23% NaF. Microhardness of dentin was significantly higher with all the tested materials, when pH-cycling was associated to NaF 0.05%, at 50 microm and 100 microm depths. OU resulted in similar dentin hardness at all depths and storage media. The incorporation of NaF 0.05% fluoride therapy to the cariogenic challenge was capable to recover the original microhardness of dentin at 50 and 100 microm with all the tested materials. Copyright 2010 Elsevier Ltd. All rights reserved.

  13. Solvation behavior of carbonate-based electrolytes in sodium ion batteries.

    Science.gov (United States)

    Cresce, Arthur V; Russell, Selena M; Borodin, Oleg; Allen, Joshua A; Schroeder, Marshall A; Dai, Michael; Peng, Jing; Gobet, Mallory P; Greenbaum, Steven G; Rogers, Reginald E; Xu, Kang

    2016-12-21

    Sodium ion batteries are on the cusp of being a commercially available technology. Compared to lithium ion batteries, sodium ion batteries can potentially offer an attractive dollar-per-kilowatt-hour value, though at the penalty of reduced energy density. As a materials system, sodium ion batteries present a unique opportunity to apply lessons learned in the study of electrolytes for lithium ion batteries; specifically, the behavior of the sodium ion in an organic carbonate solution and the relationship of ion solvation with electrode surface passivation. In this work the Li(+) and Na(+)-based solvates were characterized using electrospray mass spectrometry, infrared and Raman spectroscopy, (17)O, (23)Na and pulse field gradient double-stimulated-echo pulse sequence nuclear magnetic resonance (NMR), and conductivity measurements. Spectroscopic evidence demonstrate that the Li(+) and Na(+) cations share a number of similar ion-solvent interaction trends, such as a preference in the gas and liquid phase for a solvation shell rich in cyclic carbonates over linear carbonates and fluorinated carbonates. However, quite different IR spectra due to the PF6(-) anion interactions with the Na(+) and Li(+) cations were observed and were rationalized with the help of density functional theory (DFT) calculations that were also used to examine the relative free energies of solvates using cluster - continuum models. Ion-solvent distances for Na(+) were longer than Li(+), and Na(+) had a greater tendency towards forming contact pairs compared to Li(+) in linear carbonate solvents. In tests of hard carbon Na-ion batteries, performance was not well correlated to Na(+) solvent preference, leading to the possibility that Na(+) solvent preference may play a reduced role in the passivation of anode surfaces and overall Na-ion battery performance.

  14. Brain intra- and extracellular sodium concentration in multiple sclerosis: a 7 T MRI study.

    Science.gov (United States)

    Petracca, Maria; Vancea, Roxana O; Fleysher, Lazar; Jonkman, Laura E; Oesingmann, Niels; Inglese, Matilde

    2016-03-01

    Intra-axonal accumulation of sodium ions is one of the key mechanisms of delayed neuro-axonal degeneration that contributes to disability accrual in multiple sclerosis. In vivo sodium magnetic resonance imaging studies have demonstrated an increase of brain total sodium concentration in patients with multiple sclerosis, especially in patients with greater disability. However, total sodium concentration is a weighted average of intra- and extra-cellular sodium concentration whose changes reflect different tissue pathophysiological processes. The in vivo, non-invasive measurement of intracellular sodium concentration is quite challenging and the few applications in patients with neurological diseases are limited to case reports and qualitative assessments. In the present study we provide first evidence of the feasibility of triple quantum filtered (23)Na magnetic resonance imaging at 7 T, and provide in vivo quantification of global and regional brain intra- and extra-cellular sodium concentration in 19 relapsing-remitting multiple sclerosis patients and 17 heathy controls. Global grey matter and white matter total sodium concentration (respectively P brain regional level, clusters of increased total sodium concentration and intracellular sodium concentration and decreased intracellular sodium volume fraction were found in several cortical, subcortical and white matter regions when patients were compared with healthy controls (P < 0.05 family-wise error corrected for total sodium concentration, P < 0.05 uncorrected for multiple comparisons for intracellular sodium concentration and intracellular sodium volume fraction). Measures of total sodium concentration and intracellular sodium volume fraction, but not measures of intracellular sodium concentration were correlated with T2-weighted and T1-weighted lesion volumes (0.05 < P < 0.01) and with Expanded Disability Status Scale (P < 0.05). Thus, suggesting that while intracellular sodium volume fraction decrease could

  15. Modular Coils with Low Hydrogen Content Especially for MRI of Dry Solids.

    Directory of Open Access Journals (Sweden)

    Timon Eichhorn

    Full Text Available Recent advances have enabled fast magnetic resonance imaging (MRI of solid materials. This development has opened up new applications for MRI, but, at the same time, uncovered new challenges. Previously, MRI-invisible materials like the housing of MRI detection coils are now readily depicted and either cause artifacts or lead to a decreased image resolution. In this contribution, we present versatile, multi-nuclear single and dual-tune MRI coils that stand out by (1 a low hydrogen content for high-resolution MRI of dry solids without artifacts; (2 a modular approach with exchangeable inductors of variable volumes to optimally enclose the given object; (3 low cost and low manufacturing effort that is associated with the modular approach; (4 accurate sample placement in the coil outside of the bore, and (5 a wide, single- or dual-tune frequency range that covers several nuclei and enables multinuclear MRI without moving the sample.The inductors of the coils were constructed from self-supporting copper sheets to avoid all plastic materials within or around the resonator. The components that were mounted at a distance from the inductor, including the circuit board, coaxial cable and holder were manufactured from polytetrafluoroethylene.Residual hydrogen signal was sufficiently well suppressed to allow 1H-MRI of dry solids with a minimum field of view that was smaller than the sensitive volume of the coil. The SNR was found to be comparable but somewhat lower with respect to commercial, proton-rich quadrature coils, and higher with respect to a linearly-polarized commercial coil. The potential of the setup presented was exemplified by 1H/23Na high-resolution zero echo time (ZTE MRI of a model solution and a dried human molar at 9.4 T. A full 3D image dataset of the tooth was obtained, rich in contrast and similar to the resolution of standard cone-beam computed tomography.

  16. Structural basis for the transformation pathways of the sodium naproxen anhydrate–hydrate system

    Directory of Open Access Journals (Sweden)

    Andrew D. Bond

    2014-09-01

    Full Text Available Crystal structures are presented for two dihydrate polymorphs (DH-I and DH-II of the non-steroidal anti-inflammatory drug sodium (S-naproxen. The structure of DH-I is determined from twinned single crystals obtained by solution crystallization. DH-II is obtained by solid-state routes, and its structure is derived using powder X-ray diffraction, solid-state 13C and 23Na MAS NMR, and molecular modelling. The validity of both structures is supported by dispersion-corrected density functional theory (DFT-D calculations. The structures of DH-I and DH-II, and in particular their relationships to the monohydrate (MH and anhydrate (AH structures, provide a basis to rationalize the observed transformation pathways in the sodium (S-naproxen anhydrate–hydrate system. All structures contain Na+/carboxylate/H2O sections, alternating with sections containing the naproxen molecules. The structure of DH-I is essentially identical to MH in the naproxen region, containing face-to-face arrangements of the naphthalene rings, whereas the structure of DH-II is comparable to AH in the naproxen region, containing edge-to-face arrangements of the naphthalene rings. This structural similarity permits topotactic transformation between AH and DH-II, and between MH and DH-I, but requires re-organization of the naproxen molecules for transformation between any other pair of structures. The topotactic pathways dominate at room temperature or below, while the non-topotactic pathways become active at higher temperatures. Thermochemical data for the dehydration processes are rationalized in the light of this new structural information.

  17. Thiolated polycarbophil/glutathione: defining its potential as a permeation enhancer for oral drug administration in comparison to sodium caprate.

    Science.gov (United States)

    Perera, Glen; Barthelmes, Jan; Vetter, Anja; Krieg, Christof; Uhlschmied, Cindy; Bonn, Günther K; Bernkop-Schnürch, Andreas

    2011-08-01

    Thiolated polyacrylates were shown to be permeation enhancers with notable potential. The aim of this study was to evaluate the permeation enhancing properties of a thiolated polycarbophil/glutathione (PCP-Cys/GSH) system for oral drug application in comparison to a well-established permeation enhancer, namely sodium caprate. In vitro permeation studies were conducted in Ussing-type chambers with sodium fluoresceine (NaFlu) and fluoresceine isothiocyanate labeled dextran (molecular mass 4 kDa; FD4) as model compounds. Bioavailability studies were carried out in Sprague Dawley rats with various formulations. Moreover, cytotoxic effects of both permeation enhancers were compared. Permeation enhancement ratios of 1% sodium caprate were found to be 3.0 (FD4) and 2.3 (NaFlu), whereas 1% PCP-Cys/0.5% GSH displayed enhancement ratios of 2.4 and 2.2. Both excipients performed at a similar level in vivo. Sodium caprate solutions increased oral bioavailability 2.2-fold (FD4) and 2.3-fold (NaFlu), while PCP-Cys hydrogels led to a 3.2-fold and 2.2-fold enhancement. Cell viability experiments revealed a significantly higher tolerance of Caco-2 cells towards 0.5% PCP-Cys (81% survival) compared to 0.5% sodium caprate (5%). As PCP-Cys is not absorbed from mucosal membranes due to its comparatively high molecular mass, systemic side-effects can be excluded. In conclusion, both systems displayed a similar potency for permeation enhancement of hydrophilic compounds. However, PCP-Cys seems to be less harmful to cultured cells.

  18. Methyl Quantum Tunneling and NITROGEN-14 Nqr Studies Using a DC SQUID Magnetic Resonance Spectrometer.

    Science.gov (United States)

    Black, Bruce Elmer

    Nuclear Magnetic Resonance (NMR) and Nuclear Quadrupole Resonance (NQR) techniques have been very successful in obtaining molecular conformation and dynamics information. Unfortunately, standard NMR and NQR spectrometers are unable to adequately detect resonances below a few megahertz due to the frequency dependent sensitivity of their Faraday coil detectors. For this reason a new spectrometer with a dc SQUID (Superconducting Quantum Interference Device) detector, which has no such frequency dependence, has been developed. Previously, this spectrometer was used to observe ^ {11}B and ^{27} Al NQR resonances. I have increased the scope of this study to include ^{23}Na, ^{51}V, and ^ {55}Mn NQR transitions. Also, I present a technique to observe ^{14}N NQR resonances through cross relaxation of the nitrogen polarization to adjacent proton spins. When the proton Zeeman splitting matches one nitrogen quadrupolar transition the remaining two ^ {14}N transitions can be detected by sweeping a saturating rf field through resonance. Additionally, simultaneous excitation of two nitrogen resonances provides signal enhancement which helps to connect transitions from the same site. In this way, we have observed nitrogen -14 resonances in several amino acids and polypeptides. This spectrometer has also been useful in the direct detection of methyl quantum tunneling splittings at 4.2 K. Tunneling frequencies of a homologous series of carboxylic acids were measured and for solids with equivalent crystal structures, an exponential correlation between the tunneling frequency and the enthalpy of fusion is observed. This correlation provides information about the contribution of intermolecular interactions to the energy barrier for methyl rotation.

  19. Ion microprobe analysis of bone surface elements: Effects of 1,25(OH)2D3

    Energy Technology Data Exchange (ETDEWEB)

    Bushinsky, D.A.; Chabala, J.M.; Levi-Setti, R. (Univ. of Chicago, IL (USA))

    1989-12-01

    When neonatal mouse calvariae are incubated with 1,25-dihydroxyvitamin D3 (1,25(OH)2D3) there is net calcium efflux from the bone into the medium. The effect of this enhanced cell-mediated Ca efflux on the relative concentrations of mineral 23Na, 39K, and 40Ca has not previously been studied. We used an imaging scanning ion microprobe, utilizing secondary ion mass spectrometry, to compare the relative ion concentrations of Na, K, and Ca on the surface, subsurface, and cross-section of cultured bone incubated in the presence of 1,25(OH)2D3 with the ion concentrations in similar regions of bone incubated in unaltered control medium. Changes in mineral ion concentration were correlated with net fluxes of Na, K, and Ca relative to bone. Calvariae incubated in control medium (24 h at pH approximately 7.40) have abundant surface Na and K relative to Ca (Na/Ca, 85 and K/Ca, 68), whereas the subsurface has less Na/Ca (21) and K/Ca (23), and on cross section the ratios of both Na/Ca (2.0) and K/Ca (1.9) decrease further. After incubation with 10(-8) M 1,25(OH)2D3, there is a significant increase in bone surface Na/Ca (154) and K/Ca (141) without a change in these ratios on the subsurface and a small fall in both ratios on cross section. The linear relationship between Na/Ca and K/Ca across the three regions of bone observed in control calvariae did not change with 1,25(OH)2D3 treatment. As determined by flux measurements there is a net efflux of Ca but not Na or K from bone.

  20. Examination of cucurbit[7]uril and its host-guest complexes by diffusion nuclear magnetic resonance.

    Science.gov (United States)

    Wheate, Nial J; Kumar, P G Anil; Torres, Allan M; Aldrich-Wright, Janice R; Price, William S

    2008-02-28

    The self-diffusion of cucurbit[7]uril (CB[7]) and its host-guest complexes in D2O has been examined using pulsed gradient spin-echo nuclear magnetic resonance spectroscopy. CB[7] diffuses freely at a concentration of 2 mM with a diffusion coefficient (D) of 3.07 x 10(-10) m(2) s(-1). At saturation (3.7 mM), CB[7] diffuses more slowly (D = 2.82 x 10(-10) m(2) s(-1)) indicating that it partially self-associates. At concentrations between 2 and 200 mM, CsCl has no effect on the diffusion coefficient of CB[7] (1 mM). Conversely, CB[7] (2 mM) significantly affects the diffusion of 133Cs+ (1 mM), decreasing its diffusion coefficient from 1.86 to 0.83 x 10(-9) m(2) s(-1). Similar changes in the rate of diffusion of other alkali earth metal cations are observed upon the addition of CB[7]. The diffusion coefficient of 23Na+ changes from 1.26 to 0.90 x 10(-9) m(2) s(-1) and 7Li+ changes from 3.40 to 3.07 x 10(-9) m(2) s(-1). In most cases, encapsulation of a variety of inorganic and organic guests within CB[7] decreases their rates of diffusion in D2O. For instance, the diffusion coefficient of the dinuclear platinum complex trans-[[PtCl(NH3)2}2mu-dpzm](2+) (where dpzm is 4,4'-dipyrazolylmethane) decreases from 4.88 to 2.95 x 10(-10) m(2) s(-1) upon encapsulation with an equimolar concentration of CB[7].

  1. PRELIMINARY CROSS SECTION AND NU-BAR COVARIANCES FOR WPEC SUBGROUP 26

    Energy Technology Data Exchange (ETDEWEB)

    ROCHMAN,D.

    2007-01-31

    We report preliminary cross section covariances developed for the WPEC Subgroup 26 for 45 out of 52 requested materials. The covariances were produced in 15- and 187-group representations as follows: (1) 36 isotopes ({sup 16}O, {sup 19}F, {sup 23}Na, {sup 27}Al, {sup 28}Si, {sup 52}Cr, {sup 56,56}Fe, {sup 58}Ni, {sup 90,91,92,94}Zr, {sup 166,167,168,170}Er, {sup 206,207,208}Pb, {sup 209}Bi, {sup 233,234,236}U, {sup 237}Np, {sup 238,240,241,242}Pu, {sup 241,242m,243}Am, {sup 242,243,244,245}Cm) were evaluated using the BNL-LANL methodology. For the thermal region and the resolved and unresolved resonance regions, the methodology has been based on the Atlas-Kalman approach, in the fast neutron region the Empire-Kalman method has been used; (2) 6 isotopes ({sup 155,156,157,158,160}Gd and {sup 232}Th) were taken from ENDF/B-VII.0; and (3) 3 isotopes ({sup 1}H, {sup 238}U and {sup 239}Pu) were taken from JENDL-3.3. For 6 light nuclei ({sup 4}He, {sup 6,7}Li, {sup 9}Be, {sup 10}B, {sup 12}C), only partial cross section covariance results were obtained, additional work is needed and they do not report the results here. Likewise, the cross section covariances for {sup 235}U, which they recommend to take from JENDL-3.3, will be included once the multigroup processing is successfully completed. Covariances for the average number of neutrons per fission, total {nu}-bar, are provided for 10 actinides identified as priority by SG26. Further work is needed to resolve some of the issues and to produce covariances for the full set of 52 materials.

  2. Reinforcing the municipal level in Iceland: Ideas, policies and implementations Efling íslenska sveitarstjórnarstigsins: Áherslur, hugmyndir og aðgerðir

    Directory of Open Access Journals (Sweden)

    Grétar Þór Eyþórsson

    2012-12-01

    talska stjórnmálafræðingsins Bruno Dente um það hvernig ríki hafa reynt að lögmæta ríkisvaldið með því að laga það að þjóðfélagsþróuninni með endurskoðunar- og umbreytingarferlum m.a. á neðri stjórnstigum. Upphaf hugmynda sem lotið hafa að því að efla sveitarstjórnarstigið á því tímabili sem skoðað var má rekja til greinar Jónasar Guðmundssonar sem birtist 1943 í tímaritinu Sveitarstjórnarmál. Síðan þá hafa ný Sveitarstjórnarlög verið samþykkt á Alþingi árin 1961, 1986 og 2011. Einu sinni hafa verið sett sérstök lög um sameiningu sveitarfélaga, árið 1970. Þá hefur tvívegis verið efnt til átaksverkefna með því að efna til víðtækra kosninga um sameiningu sveitarfélaga; fyrra skiptið árið 1993 og í það síðara árið 2005. Tvívegis hafa stórir málaflokkar verið fluttir úr umsjá ríkis til sveitarfélaga; grunnskólinn frá 1996 og málefni fatlaðra frá 2011. Meginniðurstaðan varðandi greiningarramma Dente um umbreytingar á sveitarstjórnarstigi er sú að finna má aðgerðum, hugmyndum og áherslum á Íslandi víða stað í greiningarramma Dente. Sameiningar og verkefnaflutningurfrá ríki tilsveitarfélaga hafa þar lengst af verið meginstefið. Efling sveitarfélaga með innri breytingum er nokkuð sem fyrst og fremst hefur komið til eftir síðustu aldamót og þá einkanlega í formi lýðræðisumbóta.

  3. Strategie przedsiębiorstwa prasowego w XXI wieku (internalizacja oraz obecność na rynku nowych technologii

    Directory of Open Access Journals (Sweden)

    Anita Uchańska

    2011-05-01

    ędzynarodowym. Jednak kryzys rynku prasowego zmusił także i te przedsiębiorstwa do poszukiwania z jednej strony oszczędności (redukcja kosztów działalności i zatrudnienia, restrukturyzacja, łączenie redakcji, z drugiej zaś nowych źródeł przychodów, jakimi stały się inwestycje w przedsięwzięcia internetowe i nowe media, stąd wśród istotnych elementów strategii przedsiębiorstw prasowych znalazła się digitalizacja. Wydawcy prasy wciąż starają się uatrakcyjnić swoją ofertę, wprowadzając na rynek innowacje, począwszy od zmiany layoutu, poprzez poprawienie jakości dziennikarstwa, po nowe formy przekazu, w tym serwisy internetowe i aplikacje elektroniczne. Równocześnie jednak przychody przedsiębiorstw prasowych wciąż spadają, na co wpływ ma także zmiana zwyczajów czytelniczych, a także stopniowe przenoszenie się reklamodawców do Internetu. Mimo problemów wydawcy starają się podążać za postępem technicznym i elastycznie reagować na dynamicznie zmieniającą się sytuację na rynku, aby nie dopuścić do realizacji czarnego scenariusza, zakładającego „śmierć prasy drukowanej”.

  4. Filosofie sportu nebo filosofické uvažování o sportu Philosophy of sport or philosophical reflection on sport

    Directory of Open Access Journals (Sweden)

    Jerzy Kosiewicz

    2006-02-01

    Full Text Available Hlavním úkolem prezentace je iniciovat diskusi o současném postavení, formální a meritorní situaci filosofie sportu. Zajímavé je odpovědět si na následující otázku: lze říci, že máme co do činění se skutečnou, vyspělou, kompetentní a nezávislou vědní disciplínou, nebo jde spíše o určité filosofické úvahy o sportu, které se v budoucnu stanou nezávislou filosofickou disciplínou? Jsem toho názoru, že filosofie sportu teprve zahájila proces strukturalizace, kladení a řešení mnoha problémů, vytváření různých názorových pohledů, které jsou charakteristické pro autory s různým vzděláním a s různými výzkumnými prioritami. Započala také stavbu základů a utváření metodologických nástrojů, které budou vhodné pro tento nový obor filosofie usilující o nezávislost. Hlavní břemeno výzkumných projektů a jejich realizací spočívá na bedrech filosofů v pravém slova smyslu, kteří budou zkoumat různé projevy a aspekty sportu. Filosofie sportu se snaží definovat sebe samu a rozpracovává své charakteristiky a formy výzkumu. Důležitou příležitostí je pro ni spolupráce s dalšími obory filosofie (a nejen filosofie s cílem využít již vypracované a vyzkoušené struktury umožňující filosofii sportu formulovat svůj vlastní jazyk, koherentní kód, kategorii pojmů a specifickou podrobnou metodologii sloužící pro popis a vysvětlení zdrojů, obsahů a významů, kterými se vyznačují praktické a teoretické projevy a vlastnosti sportu. Dokud však nebude tato etapa utváření nové disciplíny ukončena, budeme mít co do činění spíše s filosofickými úvahami o sportu než s filosofií sportu. The main task of my presentation is to initiate the discussion about the contemporary position, as well as the current formal and merit situation of philosophy of sport. It is interesting to answer the following question: if we can say, that, at the

  5. Enforced linguistic conversion: translation of the Macedonian toponyms in the 20th century

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    Katica Kulavkova

    2015-08-01

    towards a systematic negation of the Macedonian linguistic and cultural identity, and with that, they deny the right of Macedonian people for their own national country, for every negation lies under the intention of re‑interpreting and retouching the historical reality. Wymuszona konwersja językowa: tłumaczenie macedońskich toponimów w XX wieku W artykule podjęto zagadnienia związane z wymuszoną konwersją toponimów ma­cedońskich, co może być traktowane jako forma językowego i kulturowego przemieszcze­nia / zwichnięcia / luxatio (łac. luxatio, luxare, luxus – zwichnięcie. Toponimy są nie tylko szczególnymi znakami językowymi, świadczą też o cywilizacyjnej pamięci narodów i całej ludzkości, stanowią przy tym odbicie faktów i dziedzictwa kulturowego, chronionego mocą międzynarodowych regulacji prawnych. Przekład toponimów z jednego języka na inny w ra­mach jednej przestrzeni kulturowej i etnicznej oznacza niewątpliwie przemoc wobec tego dziedzictwa. Zamiana toponimu i jego wymuszone tłumaczenie na inny język na mocy usta­nawianych w tym celu aktów prawnych staje się przestępstwem (zbrodnią wobec kultury. Toponim jest bowiem rzeczywistym odbiciem faktów i wspomnień historycznych. Toponimy można przepisywać innym alfabetem, litera po literze (łac. transliteratio, ale nie można ich przekładać, zwłaszcza na terytorium, na którym były ustanowione, stosowane i dziedziczone. Wymuszona zamiana prowadzi faktycznie do przekształcenia narracji historycznych i tożsa­mości etniczno‑kulturowej. Historia dowodzi, że istnieją pewne formy przemocy prowadzące do dyslokacji językowej, religijnej i etnicznej. Radykalna rewizja macedońskich toponimów zidentyfikowanych jako słowiańskie jest prawdopodobnie jednym z nielicznych przykładów, jakie zna współczesna historia. Tak dzieje się od prawie stu lat – od początku 1920 roku aż do pierwszej dekady XXI stulecia. Toponimy, które pojawiły się na etnicznym

  6. Population and Coherence Transfer Induced by Double Frequency Sweeps in Half-Integer Quadrupolar Spin Systems

    Science.gov (United States)

    Iuga, Dinu; Schäfer, Hartmut; Verhagen, Rieko; Kentgens, Arno P. M.

    2000-12-01

    We have recently shown that the sensitivity of single- and multiple-quantum NMR experiments of half-integer (N/2) quadrupolar nuclei can be increased significantly by introducing so-called double frequency sweeps (DFS) in various pulse schemes. These sweeps consist of two sidebands generated by an amplitude modulation of the RF carrier. Using a time-dependent amplitude modulation the sidebands can be swept through a certain frequency range. Inspired by the work of Vega and Naor (J. Chem. Phys. 75, 75 (1981)), this is used to manipulate ±(m - 1) ↔ ±m (3/2 ≤ m ≤ N/2) satellite transitions in half-integer spin systems simultaneously. For 23Na (I = 3/2) and 27Al (I = 5/2) spins in single crystals it proved possible to transfer the populations of the outer ±m spin levels to the inner ±1/2 spin levels. A detailed analysis shows that the efficiency of this process is a function of the adiabaticity with which the various spin transitions are passed during the sweep. In powders these sweep parameters have to be optimized to satisfy the appropriate conditions for a maximum of spins in the powder distribution. The effects of sweep rate, sweep range, and RF field strength are investigated both numerically and experimentally. Using a DFS as a preparation period leads to significantly enhanced central transition powder spectra under both static and MAS conditions, compared to single pulse excitation. DFSs prove to be very efficient tools not only for population transfer, but also for coherence transfer. This can be exploited for the multiple- to single-quantum transfer in MQMAS experiments. It is demonstrated, theoretically and experimentally, that DFSs are capable of transferring both quintuple-quantum and triple-quantum coherence into single-quantum coherence in I = 5/2 spin systems. This leads to a significant enhancement in signal-to-noise ratio and strongly reduces the RF power requirement compared to pulsed MQMAS experiments, thus extending their applicability

  7. Population and coherence transfer in half-integer quadrupolar spin systems induced by simultaneous rapid passages of the satellite transitions: A static and spinning single crystal nuclear magnetic resonance study

    Science.gov (United States)

    Schäfer, Hartmut; Iuga, Dinu; Verhagen, Rieko; Kentgens, Arno P. M.

    2001-02-01

    We have recently shown that utilizing double frequency sweeps (DFSs) instead of pulses can lead to increased efficiencies in population and coherence transfer in half-integer quadrupolar spin systems. Cosine modulation of the carrier amplitude corresponds to the simultaneous irradiation of two frequencies symmetrically around the rf-carrier frequency. Convergent or divergent DFSs can be generated by appropriate time-dependent cosine modulation of the rf field. Population and coherence transfer induced by sweeping the modulation frequency through the quadrupolar satellite transitions is investigated in detail. The time dependence of such passages determines the adiabaticity of the transfer processes. Insight into the involved spin dynamics is of utmost importance in the design and optimization of experiments based on amplitude modulation, such as DFS enhanced multiple-quantum magic angle spanning, where multiple to single-quantum conversion is performed by a DFS. Vega and co-workers have provided a theoretical basis of adiabatic coherence transfer in spin-3/2 systems induced by the combined action of simple time independent cosine amplitude modulation (CAM) of the rf field and sample spinning [Madhu et al., J. Chem. Phys. 112, 2377 (2000)]. In our report we will extend this theory to DFS induced adiabatic transfer phenomena in spin-3/2 and spin-5/2 systems. A fully analytical description will be presented covering the whole adiabaticity range resulting in an accurate description of actual experiments. In this context it will be shown that both population and coherence transfer are governed by the same principles and one unique adiabaticity parameter for each pair of spectral satellites. The transfer phenomena derived for spin-3/2 systems will be studied and quantified experimentally for 23Na in a single crystal of NaNO3. In a static and spinning sample the combination with DFS and CAM irradiation will be studied showing the equivalence of the transfer in all these

  8. The PSIMECX medium-energy neutron activation cross-section library. Part II: Calculational methods for light to medium mass nuclei

    Energy Technology Data Exchange (ETDEWEB)

    Atchison, F.

    1998-09-01

    The PSIMECX library contains calculated nuclide production cross-sections from neutron-induced reactions in the energy range about 2 to 800 MeV in the following 72 stable isotopes of 24 elements: {sup 12}C, {sup 13}C, {sup 16}O, {sup 17}O, {sup 18}O, {sup 23}Na, {sup 24}Mg, {sup 25}Mg, {sup 26}Mg, {sup 27}Al, {sup 28}Si, {sup 29}Si, {sup 30}Si, {sup 31}P, {sup 32}S, {sup 33}S, {sup 34}S, {sup 36}S, {sup 35}Cl, {sup 37}Cl, {sup 39}K, {sup 40}K, {sup 41}K, {sup 40}Ca, {sup 42}Ca, {sup 43}Ca, {sup 44}Ca, {sup 46}Ca, {sup 48}Ca, {sup 46}Ti, {sup 47}Ti, {sup 48}Ti, {sup 49}Ti, {sup 50}Ti, {sup 50}V, {sup 51}V, {sup 50}Cr, {sup 52}Cr, {sup 53}Cr, {sup 54}Cr, {sup 55}Mn, {sup 54}Fe, {sup 56}Fe, {sup 57}Fe, {sup 58}Fe, {sup 58}Ni, {sup 60}Ni, {sup 61}Ni, {sup 62}Ni, {sup 64}Ni, {sup 63}Cu, {sup 65}Cu, {sup 64}Zn, {sup 66}Zn, {sup 67}Zn, {sup 68}Zn, {sup 70}Zn, {sup 92}Mo, {sup 94}Mo, {sup 95}Mo, {sup 96}Mo, {sup 97}Mo, {sup 98}Mo, {sup 100}Mo, {sup 121}Sb, {sup 123}Sb, {sup 204}Pb, {sup 206}Pb, {sup 207}Pb, {sup 208}Pb, {sup 232}Th and {sup 238}U. The energy range covers essentially all transmutation channels other than capture. The majority of the selected elements are principal constituents of normal materials of construction used in and around accelerator facilities and the library is, first and foremost, designed to be a tool for the estimation of their activation in wide-band neutron fields. This second report, of a series of three, describes and discusses the calculational methods used for the stable isotopes up to and including {sup 123}Sb. The library itself has been described in the first report of the series and the treatment for the heavy nuclei is given in the third. (author)

  9. Detecção e tipagem de vírus dengue em Aedes aegypti (Diptera: Culicidae na Cidade de Manaus, Estado do Amazonas Detection and typing of dengue viruses in Aedes aegypti (Diptera: Culicidae in the City of Manaus, State of Amazonas

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    Cristóvão Alves da Costa

    2009-12-01

    Full Text Available O estudo teve por objetivo a detecção e tipagem do vírus dengue, nos vetores Aedes aegypti. Durante o período de dezembro de 2005 a dezembro de 2006, foram coletados 8.984 mosquitos, em 46 bairros da Cidade de Manaus abrangendo todas as zonas geográficas da cidade. Destes, 819 eram Aedes aegypti (414 fêmeas e 405 machos. As fêmeas de Aedes aegypti foram agrupadas em pools de 1 a 10 mosquitos totalizando 138 pools, sendo que 111 pools foram positivos para DENV 3. Porém, um pool mostrou-se positivo para dois sorotipos, DENV 1 e DENV 3. A prevalência de Aedes aegypti infectados com DENV 3, na Cidade de Manaus foi de 53%. Entretanto, a prevalência por zona foi de 70% no Centro-oeste, 60% no Sul, 53% no Oeste, 47% no Centro-Sul, 30% no Norte e 23% na zona Leste. O monitoramento da circulação viral em mosquitos com o uso da técnica da transcrição reversa-reação da polimerase em cadeia que permite o conhecimento prévio dos níveis de disseminação viral em determinadas áreas contribuindo para determinar os locais para aplicar as medidas de prevenção e controle.The aim of this study was to detect and type dengue viruses in the vector Aedes aegypti. Between December 2005 and December 2006, 8,984 mosquitoes were collected in 46 districts of the city of Manaus, covering all of the geographical zones of the city. Of these, 819 were Aedes aegypti (414 females and 405 males. The females of Aedes aegypti were grouped in pools of 1 to 10 mosquitoes, thus totaling 138 pools, of which 111 pools were positive for DENV 3 and a single pool was positive for two serotypes (DENV 1 and DENV 3. The prevalence of Aedes aegypti infected with DENV 3 in the city of Manaus was 53%. The zonal prevalence was 70% in the western central zone, 60% in the southern zone, 53% in the western zone, 47% in the southern central zone, 30% in the northern zone and 23% in the eastern zone. Monitoring of virus circulation among mosquitoes by means of the reverse

  10. Constraints on CEMP-no progenitors from nuclear astrophysics

    Science.gov (United States)

    Choplin, Arthur; Maeder, André; Meynet, Georges; Chiappini, Cristina

    2016-09-01

    Context. The CEMP-no stars are long-lived small mass stars presenting a very low iron content and overabundances of carbon with no sign or only very weak signs of s- or r-elements. Although the origin of this abundance pattern is still a matter of debate, it was very likely inherited from a previous massive star, which we call the source star. Aims: We rely on a recent classification of CEMP-no stars arguing that some of them are made of a material processed by hydrogen burning that was enriched in products of helium burning during the nuclear life of the source star. We examine the possibility of forming CEMP-no stars with this material. Methods: We study the nucleosynthesis of the CNO cycle and the Ne-Na Mg-Al chains in a hydrogen burning single zone while injecting the helium burning products 12C, 16O, 22Ne, and 26Mg. We investigate the impact of changing density, temperature and the injection rate. The nuclear reaction rates involving the creation and destruction of 27Al are also examined. Results: 14N, 23Na, 24Mg, and 27Al are formed when injecting 12C, 16O, 22Ne, and 26Mg in the hydrogen burning zone. The 12C/13C ratio is constant under various conditions in the hydrogen burning zone. The predicted [Al/Fe] ratio varies up to ~ 2 dex depending on the prescription used for the reaction rates involving 27Al. Conclusions: The experiments we carried out support the view that some CEMP-no stars are made of a material processed by hydrogen burning that comes from a massive star experiencing mild to strong rotational mixing. During its burning, this material was likely enriched in helium burning products. No material coming from the carbon-oxygen rich core of the source star should be added to form the daughter star, otherwise the 12C/13C ratio would be largely above the observed range of values.

  11. Análise operacional de um sistema fotovoltaico de bombeamento de água Operational analysis of a photovoltaic water pumping (PV system

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    Evandro M. Kolling

    2004-12-01

    Full Text Available O bombeamento de água é uma das atividades mais difundidas quanto ao emprego da energia solar fotovoltaica. Porém, apesar de se apresentar como alternativa interessante, o alto custo, a baixa eficiência dos sistemas e os projetos inadequados restringem sua aplicação. O uso racional, baseado na utilização mais eficiente de seus equipamentos, está vinculado ao conhecimento do comportamento operacional desses sistemas. No presente trabalho, teve-se o objetivo de avaliar o comportamento de um sistema fotovoltaico de bombeamento de água diretamente acoplado, sob diferentes condições de irradiância solar, por meio da montagem de uma bancada de testes, submetendo-o a diferentes alturas manométricas e determinando-se a vazão fornecida. A análise dos resultados permitiu estabelecer um modelo de regressão para estimativa de vazão do sistema em função da irradiância e altura manométrica. Concluiu-se que a potência gerada pelo painel e a vazão fornecida pela motobomba estão diretamente relacionadas à irradiância solar e à altura manométrica e influenciam na eficiência do sistema. A máxima eficiência do painel foi de 8%, 39% para a motobomba e 2,3% na interação dos componentes.The pumping of water is one of the activities most diffused to the employment of the photovoltaic solar energy, in spite of coming as an interesting alternative, the high cost and it lowers efficiency of the systems with the inadequate projects, still restricts its application. The rational use, based on the most efficient use of its equipments is linked to the knowledge of the operational behavior of these systems. The present work objectified to evaluate the operational behavior of a photovoltaic water pumping directly coupled operating in different conditions of solar irradiance, by means of the assembly of supported tests, submitting to different manometer elevation and determining the supplied rate flux of water. The analysis of the results allowed to determine a regression model for flux of water estimation as function of irradiance and manometer elevation. Was concluded that the power generated by the array and the rate flux supplied by the motor-pump is directly related to the solar irradiance. The maximum efficiency of the array was of 8%, 39% for the motor-pump and, 2.3% in the interaction of the components in the system.

  12. Colour changes in different processing conditions of green olives of Chalkidiki variety

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    Karaoulanis, G. D.

    1995-06-01

    Full Text Available Green table olives of Chalkidiki variety, which are subject to enzymatic browning during processing and preservation by the commercial method, were collected in different pickings and in two cultivating years. Then, they were treated with 1.5%, 1.7%, 2% and 2.3% NaOH.
    During the removal of bitterness, washing, fermentation and preservation the green olives were kept, as much as possible, away from any contact with air. The pH was kept at relatively low values (~4.0, mainly during the preservation of green olives. Besides, the concentration of brine was kept constant during the stage of fermentation and preservation (8-10%.
    The aforementioned precaution resulted in the protection of the colour of the flesh and of the skin from enzymatic browning to a very satisfactory degree.
    As for the texture of the fruits, the firmness was well presented.

    Aceitunas verdes de mesa de la variedad Chalkidiki, sometidas a ennegrecimiento enzimático durante su tratamiento y conservación por métodos comerciales, se recogieron en diferentes cosechas y en dos años distintos. Posteriormente, se trataron con un 1'5%, 17%, 2% y 2'3% de NaOH.
    Durante la eliminación del amargor, lavado, fermentación y conservación, las aceitunas verdes se guardaron, tanto como fue posible, libre de contacto con el aire. El pH se mantuvo a valores relativamente bajos (~4'0, principalmente durante la conservación de aceitunas verdes. Además, la concentración de salmuera se mantuvo constante durante la etapa de fermentación y conservación (8-10%.
    La precaución anteriormente señalada tuvo como resultado la protección del color de la pulpa y de la piel del ennegrecimiento enzimático a un nivel muy satisfactorio.
    En cuanto a la textura del fruto, la firmeza se conservó bien.

  13. IgG intrathecal synthesis and specific antibody index in patients with neurocysticercosis Síntese intratecal de IgG e índice de anticorpos específicos em pacientes com neurocisticercose

    Directory of Open Access Journals (Sweden)

    Luís R. Machado

    2002-06-01

    Full Text Available We analyzed cerebrospinal fluid (CSF and blood serum from 55 patients with neurocysticercosis (NC at different clinical stages. According to inflammatory activity in the CSF, three stages were identified: (1 reactive, when there was at least an increase in the number of cells; (2 weakly reactive, when significant alterations were found in the CSF, including an increase in gamma globulins, albeit without hypercytosis; (3 non-reactive, when there was neither hypercytosis nor increase in gamma globulins. Nineteen patients had the reactive form; 18 had the weakly reactive form; 18 displayed the non-reactive form. Local immunoproduction was intense in the reactive group, moderate in the weakly reactive group, and absent in the non-reactive group. The specific antibody index was raised in approximately 2/3 of patients with the reactive form, 2/3 in those with the weakly reactive form, and 1/3 in those with the non-reactive form. In conclusion: (1 the classical CSF syndrome in NC can present both in complete and partial modes; (2 local immunoproduction can occur in weakly reactive forms; (3 a raised specific antibody index can occur in the absence of an inflammatory reaction in the CSF.Analisamos o líquido cefalorraqueano (LCR e o soro sanguíneo de 55 pacientes com neurocisticercose (NC em diversas fases de evolução. De acordo com a atividade inflamatória no LCR, foram consideradas três formas: (1 reativa, quando havia pelo menos aumento do número de células; (2 fracamente reativa, quando havia alterações no LCR, incluindo aumento de globulinas gama, mas sem pleocitose; (3 não reativa, quando não havia pleocitose nem aumento de globulinas gama. Dezenove pacientes apresentavam a forma reativa, 18 a forma fracamente reativa, 18 a não reativa. O índice de anticorpos específicos estava aumentado em cerca de 2/3 dos pacientes das formas reativa, em 2/3 na forma fracamente reativa e em 1/3 na forma não reativa. Conclusão: (1 a síndrome do LCR na NC pode apresentar-se tanto de modo completo quanto de modo parcial; (2 imunoprodução local de anticorpos específicos pode ocorrer também em pacientes sem aumento de células; (3 índice de anticorpos específicos elevado pode ocorrer mesmo na ausência de reação inflamatória no LCR.

  14. New developments of {sup 11}C post-accelerated beams for hadron therapy and imaging

    Energy Technology Data Exchange (ETDEWEB)

    Augusto, R.S., E-mail: r.s.augusto@cern.ch [European Organization for Nuclear Research – CERN, 1211 Geneva 23 (Switzerland); Ludwig Maximilians – University of Munich, Munich (Germany); Mendonca, T.M.; Wenander, F. [European Organization for Nuclear Research – CERN, 1211 Geneva 23 (Switzerland); Penescu, L. [MedAustron GmbH, Wiener Neustadt (Austria); Orecchia, R. [CNAO – Centro Nazionale di Adroterapia Oncologica per il trattamento dei tumori, Pavia (Italy); Parodi, K. [Ludwig Maximilians – University of Munich, Munich (Germany); Ferrari, A.; Stora, T. [European Organization for Nuclear Research – CERN, 1211 Geneva 23 (Switzerland)

    2016-06-01

    Hadron therapy was first proposed in 1946 and is by now widespread throughout the world, as witnessed with the design and construction of the CNAO, HIT, PROSCAN and MedAustron treatment centres, among others. The clinical interest in hadron therapy lies in the fact that it delivers precision treatment of tumours, exploiting the characteristic shape (the Bragg peak) of the energy deposition in the tissues for charged hadrons. In particular, carbon ion therapy is found to be biologically more effective, with respect to protons, on certain types of tumours. Following an approach tested at NIRS in Japan [1], carbon ion therapy treatments based on {sup 12}C could be combined or fully replaced with {sup 11}C PET radioactive ions post-accelerated to the same energy. This approach allows providing a beam for treatment and, at the same time, to collect information on the 3D distributions of the implanted ions by PET imaging. The production of {sup 11}C ion beams can be performed using two methods. A first one is based on the production using compact PET cyclotrons with 10–20 MeV protons via {sup 14}N(p,α){sup 11}C reactions following an approach developed at the Lawrence Berkeley National Laboratory [2]. A second route exploits spallation reactions {sup 19}F(p,X){sup 11}C and {sup 23}Na(p,X){sup 11}C on a molten fluoride salt target using the ISOL (isotope separation on-line) technique [3]. This approach can be seriously envisaged at CERN-ISOLDE following recent progresses made on {sup 11}C{sup +} production [4] and proven post-acceleration of pure {sup 10}C{sup 3/6+} beams in the REX-ISOLDE linac [5]. Part of the required components is operational in radioactive ion beam facilities or commercial medical PET cyclotrons. The driver could be a 70 MeV, 1.2 mA proton commercial cyclotron, which would lead to 8.1 × 10{sup 711}C{sup 6+} per spill. This intensity is appropriate using {sup 11}C ions alone for both imaging and treatment. Here we report on the ongoing feasibility

  15. New developments of 11C post-accelerated beams for hadron therapy and imaging

    Science.gov (United States)

    Augusto, R. S.; Mendonca, T. M.; Wenander, F.; Penescu, L.; Orecchia, R.; Parodi, K.; Ferrari, A.; Stora, T.

    2016-06-01

    Hadron therapy was first proposed in 1946 and is by now widespread throughout the world, as witnessed with the design and construction of the CNAO, HIT, PROSCAN and MedAustron treatment centres, among others. The clinical interest in hadron therapy lies in the fact that it delivers precision treatment of tumours, exploiting the characteristic shape (the Bragg peak) of the energy deposition in the tissues for charged hadrons. In particular, carbon ion therapy is found to be biologically more effective, with respect to protons, on certain types of tumours. Following an approach tested at NIRS in Japan [1], carbon ion therapy treatments based on 12C could be combined or fully replaced with 11C PET radioactive ions post-accelerated to the same energy. This approach allows providing a beam for treatment and, at the same time, to collect information on the 3D distributions of the implanted ions by PET imaging. The production of 11C ion beams can be performed using two methods. A first one is based on the production using compact PET cyclotrons with 10-20 MeV protons via 14N(p,α)11C reactions following an approach developed at the Lawrence Berkeley National Laboratory [2]. A second route exploits spallation reactions 19F(p,X)11C and 23Na(p,X)11C on a molten fluoride salt target using the ISOL (isotope separation on-line) technique [3]. This approach can be seriously envisaged at CERN-ISOLDE following recent progresses made on 11C+ production [4] and proven post-acceleration of pure 10C3/6+ beams in the REX-ISOLDE linac [5]. Part of the required components is operational in radioactive ion beam facilities or commercial medical PET cyclotrons. The driver could be a 70 MeV, 1.2 mA proton commercial cyclotron, which would lead to 8.1 × 10711C6+ per spill. This intensity is appropriate using 11C ions alone for both imaging and treatment. Here we report on the ongoing feasibility studies of such approach, using the Monte Carlo particle transport code FLUKA [6,7] to simulate

  16. Investigation of Ti-doped NaAlH4 by solid-state NMR

    Energy Technology Data Exchange (ETDEWEB)

    Maxwell, R; Majzoub, E; Herberg, J

    2003-11-24

    In recent years, the development of Ti-doped NaAlH{sub 4} as a hydrogen storage material has gained attention because of its large weight percentage of hydrogen ({approx}5%) compared to traditional interstitial hydrides. The addition of transition-metal dopants, in the form of Ti-halides, such as TiCl{sub 3}, dramatically improves the kinetics of the absorption and desorption of hydrogen from NaAlH{sub 4}. However, the role that Ti plays in enhancing the absorption and desorption of H{sub 2} is still unknown. In the present study, {sup 27}Al, {sup 23}Na, and {sup 1}H MAS (Magic Angle Spinning) NMR (Nuclear Magnetic Resonance) has been performed to understand the titanium speciation in Ti-doped NaAlH{sub 4}. All experiments were performed on a sample of crushed single crystals exposed to Ti during growth, a sample of solvent-mixed 4TiCl{sub 3} + 112NaAlH{sub 4}, a reacted sample of solvent-mixed TiCl{sub 3} + {sup 3}NaAlH{sub 4} with THF, and a reacted sample of ball-milled TiCl3 + 3NaAlH{sub 4}. The {sup 27}Al MAS NMR has shown differences in compound formation between solvent-mixed TiCl{sub 3} + 3NaAlH{sub 4} with THF and the mechanically ball-milled TiCl{sub 3} + 3NaAlH{sub 4}. {sup 27}Al MAS NMR of the mechanically ball-milled mixture of fully-reacted TiCl{sub 3} + 3NaAlH{sub 4} showed spectral signatures of TiAl{sub 3} while, the solvent-mixed 4TiCl{sub 3} + 112NaAlH{sub 4}, which is totally reacted, does not show the presences of TiAl{sub 3}, but shows the existence of Al{sub 2}O{sub 3}.

  17. Reversible hydrogen storage by NaAlH4 confined within a titanium-functionalized MOF-74(Mg) nanoreactor.

    Science.gov (United States)

    Stavila, Vitalie; Bhakta, Raghunandan K; Alam, Todd M; Majzoub, Eric H; Allendorf, Mark D

    2012-11-27

    We demonstrate that NaAlH(4) confined within the nanopores of a titanium-functionalized metal-organic framework (MOF) template MOF-74(Mg) can reversibly store hydrogen with minimal loss of capacity. Hydride-infiltrated samples were synthesized by melt infiltration, achieving loadings up to 21 wt %. MOF-74(Mg) possesses one-dimensional, 12 Å channels lined with Mg atoms having open coordination sites, which can serve as sites for Ti catalyst stabilization. MOF-74(Mg) is stable under repeated hydrogen desorption and hydride regeneration cycles, allowing it to serve as a "nanoreactor". Confining NaAlH(4) within these pores alters the decomposition pathway by eliminating the stable intermediate Na(3)AlH(6) phase observed during bulk decomposition and proceeding directly to NaH, Al, and H(2), in agreement with theory. The onset of hydrogen desorption for both Ti-doped and undoped nano-NaAlH(4)@MOF-74(Mg) is ∼50 °C, nearly 100 °C lower than bulk NaAlH(4). However, the presence of titanium is not necessary for this increase in desorption kinetics but enables rehydriding to be almost fully reversible. Isothermal kinetic studies indicate that the activation energy for H(2) desorption is reduced from 79.5 kJ mol(-1) in bulk Ti-doped NaAlH(4) to 57.4 kJ mol(-1) for nanoconfined NaAlH(4). The structural properties of nano-NaAlH(4)@MOF-74(Mg) were probed using (23)Na and (27)Al solid-state MAS NMR, which indicates that the hydride is not decomposed during infiltration and that Al is present as tetrahedral AlH(4)(-) anions prior to desorption and as Al metal after desorption. Because of the highly ordered MOF structure and monodisperse pore dimensions, our results allow key template features to be identified to ensure reversible, low-temperature hydrogen storage.

  18. A PIN diode controlled dual-tuned MRI RF coil and phased array for multi nuclear imaging

    Science.gov (United States)

    Ha, Seunghoon; Hamamura, Mark J.; Nalcioglu, Orhan; Tugan Muftuler, L.

    2010-05-01

    of four ports for more uniform 1H and 23Na excitation. We demonstrated that the performance is significantly improved at both frequencies with the PIN diode switched dual-frequency operation compared to an identical coil with a trap circuit.

  19. Irreducible Tensor Operators and Multiple-Quantum NMR.

    Science.gov (United States)

    Hutchison, Wayne Douglas

    The aim of the work detailed in this thesis, is to provide a concise, and illuminating, mathematical description of multiple quantum nuclear magnetic resonance (MQNMR) experiments, on essentially isolated (non-coupled) nuclei. The treatment used is based on irreducible tensor operators, which form an orthonormal basis set. Such operators can be used to detail the state of the nuclear ensemble (density matrix) during every stage, preparation, evolution and detection, of a MQNMR experiment. Moreover, such operators can be also used to provide a rigorous analysis of pulsed NMR experiments, on oriented nuclei at low temperatures, where the initial density matrix is far from trivial. The specific topics dealt with in this thesis are as follows. In the first place the properties of irreducible tensor operators are discussed in some detail. In particular, symmetric and anti-symmetric combinations of tensor operators are introduced, to reflect the Hermitian nature of the nuclear Hamiltonian and density matrix. Secondly, the creation of multipolar nuclear states using hard, non-selective rf pulses, is detailed for spin I = 1, 3/2, 2 and 5/2 nuclei, subject to an axially symmetric quadrupole interaction. Results are also given for general I. Thirdly, some experimental results, verifying the production of a triple quantum NMR state, for the I = 3/2 ^{23}Na nuclei in a single crystal of NaIO_4 are presented and discussed. Fourthly, the treatment of MQNMR experiments is extended to the low temperature regime where the initial density matrix includes Fano statistical tensors other than rank one. In particular, it is argued that MQNMR techniques could be used to enhance the anisotropy of gamma-ray emission from oriented nuclei at low temperatures. Fifthly, the effect of a more general quadrupole Hamiltonian (including an asymmetry term) on MQNMR experiments is considered for spins I = 1 and 3/2. In particular, it is shown that double quantum states evolve to give longitudinal NMR

  20. Bose-Einstein Condensation: Where Many Become One and So There is Plenty of Room at the Bottom

    Science.gov (United States)

    Kumar, N.

    Classically identical particles become quantum mechanically indistinguishable. Satyendra Nath Bose taught us, in 1924, how to correctly count the distinct microstates for the indistinguishables, and for a gas of light quanta (later photons), whose number is not conserved, e.g. can vary with temperature, he gave a proper derivation of Planck's law of black body radiation. Einstein, in 1925, generalized the Bose statistics to a quantum gas of material particles whose number is now fixed, or conserved, e.g. 4He, and thus opened a new direction in condensed matter physics: He showed that for low enough temperatures (˜1 Kelvin and below), a oscopic number of the particles must accumulate in the lowest one-particle state. This degenerate gas with an extensively occupied single one-particle state is the Bose-Einstein condensate, now called BEC. (Fragmented BEC involving a multiplicity of internal states of non-scalar Bose atoms is, however, also realizable now.) Initially thought to be a pathology of an ideal non-interacting Bose system, the BEC turned out to be robust against interactions. Thus, the Bose-Einstein condensation is a quantum phase transition, but one with a difference — it is a purely quantum statistical effect, and requires no inter-particle interaction for its occurrence. Indeed, it happens in spite of it. The condensate fraction, however, diminishes with increasing interaction strength — to less than ten per cent for 4He. The BEC turned out to underlie superfluidity, namely that the superfluid may flow through finest atomic capillaries without any viscosity. Interaction, however, seems essential to superfluidity. But, the precise connection between BEC and the superfluidity remains elusive. Thus, for example, we may have superfluidity in two-dimensions where there is no condensate! Seventy years later now, the BEC has come alive with the breakthrough in 1995 when near-ideal BEC was created in dilute alkali gases of 87Rb and 23Na atoms cooled in the

  1. Quantificação de raízes metabolicamente ativas de cana-de-açúcar Quantification of sugarcane active metabolism roots

    Directory of Open Access Journals (Sweden)

    Carlos Eduardo Faroni

    2006-06-01

    Full Text Available O objetivo deste trabalho foi desenvolver um método para determinar a distribuição e o desenvolvimento de raízes metabolicamente ativas de cana-de-açúcar no solo, por meio da técnica da diluição do isótopo 15N. O delineamento experimental foi em blocos subdivididos no tempo. A uréia foi o meio de fornecimento do traçador 15N, a partir de solução aplicada às folhas das plantas. Depois da colheita da parte aérea, foram abertas trincheiras, e as amostras de solo + raízes foram colhidas por meio de monólito. O método da diluição isotópica com 15N possibilitou avaliar a massa de raízes com metabolismo ativo e sua distribuição no solo. Houve maior distribuição porcentual das raízes metabolicamente ativas em profundidade do que na superfície do perfil, que correspondeu, respectivamente, a 31% na camada de 0,6-0,8 m e 23% na camada de 0,0-0,2 m. Além disso, o método possibilitou determinar raízes metabolicamente ativas que permaneceram no solo depois do peneiramento, que foi de 35%, o que evidencia a importância da quantificação dessas raízes.The objective of this work was to evaluate a method to determine sugarcane roots with active metabolism and its distribution and growth in the soil profile, by using isotopic dilution technique with 15N. The experimental design was in randomized blocks, the split plot was considered in relation to time. The 15N tracer was applied in the leaves of the plants as urea solution. After the harvest of the above ground part of sugarcane plants, trenches were opened and the soil + roots samples were taken by monolite. The isotopic dilution method with 15N allowed evaluating active root mass and the root distribution in the soil. There is a larger percentual distribution of the roots with active metabolism in depth than in the surface of the profile, which stands for, respectively, 31% in the layer of 0.6-0.8 m and 23% in the layer of 0.0-0.2 m. The method also made possible to determine

  2. Atual distribuição geográfica dos moluscos hospedeiros intermediários do Schistosoma mansoni em Belo Horizonte, MG, Brasil Current geographic distribution of intermediate hosts mollusca of Schistosoma mansoni in Belo Horizonte, MG, Brazil

    Directory of Open Access Journals (Sweden)

    Cecília Pereira de Souza

    1981-12-01

    Full Text Available Procedeu-se ao levantamento malacológico do município de Belo Horizonte, MG, com o objetivo de avaliar a distribuição, densidade e taxa de infecção dos moluscos hospedeiros intermediários do Schistosoma mansoni. Foram coletadas 3.261 Biomphalaria glabrata em 1979-81, das quais 100 (3,1% estavam infectadas com S. mansoni. Registrou-se a existência de 36 criadouros (35,0% de B. glabrata em 102 locais pesquisados, sendo 23 na bacia hidrográfica de Pampulha e 13 na do ribeirão do Arrudas. Foram encontrados 2 criadouros de B. tenagophila e 2 de B. straminea. Registrou-se também a presenca de exemplares de Pomacea haustrum, Physa sp e Drepanotrema cimex. Compararam-se os dados obtidos atualmente com os publicados em 1967. Houve reducao de mais de 50% no número de criadouros de B.glabrata, principalmente em decorrencias da expansão e progresso da cidade. Na zona periférica a esquistossomose continua endêmica, havendo necessidade de novas obras de saneamento básico para se conseguir o controle da doença.Malacological surveys were conducted in Belo Horizonte with a view to obtain new data on the distribution and density of schistosomose bearing snails and their natural rate of infection by Schistosoma mansoni. Of 3.261 Biomphalaria glabrata collected during 1979-81, 100 (3,1% were found naturally infected. One hundred and two water collections were surveyed and 36 (35% were found harboring the mentioned snail species (23 of them in the watershed of Pampulha, 13 in the tributaires of the Arrudas creek. The species B. tenagophila was found in two waterbodies, and B. straminea in two other. Other snail species collected were Pomacea haustrum, Physa sp and Drepanotrema cimex. Data of this survey were compared with data published in 1967 and 50% reduction in the snail breeding places was observed. This reduction was due mainly to public works and engineering activities accompanying the growth of city. Schistosomiasis is still present in the

  3. Aza-macrocyclic complexes of the Group 1 cations - synthesis, structures and density functional theory study.

    Science.gov (United States)

    Dyke, John; Levason, William; Light, Mark E; Pugh, David; Reid, Gillian; Bhakhoa, Hanusha; Ramasami, Ponnadurai; Rhyman, Lydia

    2015-08-21

    The Group 1 complexes, [M(Me6[18]aneN6)][BAr(F)] (M = Li-Cs; Me6[18]aneN6 = 1,4,7,10,13,16-hexamethyl-1,4,7,10,13,16-hexaazacyclooctadecane; BAr(F) = tetrakis{3,5-bis(trifluoromethyl)-phenyl}borate), are obtained in high yield by reaction of the macrocycle with M[BAr(F)] in anhydrous CH2Cl2 solution, and characterised spectroscopically ((1)H, (13)C{(1)H}, (7)Li, (23)Na, and (133)Cs NMR), by microanalysis and, for M = Li, K, and Rb, by single crystal X-ray analysis. The structures show N6-coordination to the metal ion; the small ionic radius for Li(+) leads to a puckered conformation. In contrast, the K(+) ion fits well into the N6 plane, with the [BAr(F)](-) anions above and below, leading to two K(+) species in the asymmetric unit (a hexagonal planar [K(Me6[18]aneN6)](+) cation and a '[K(Me6[18]aneN6)(κ(1)-BAr(F))2](-) anion', with long axial KF interactions). The Rb(+) ion sits above the N6 plane, with two long axial RbF interactions in one cation and two long, mutually cis RbF interactions in the other. The unusual sandwich cations, [M(Me3tacn)2](+) (M = Na, K; distorted octahedral, N6 donor set) and half-sandwich cations [Li(Me3tacn)(thf)](+) (distorted tetrahedron, N3O donor set), [Li(Me4cyclen)(OH2)](+), and [Na(Me4cyclen)(thf)](+) (both distorted square pyramids with N4O donor sets) were also prepared (Me3tacn = 1,4,7-trimethyl-1,4,7-triazacyclononane, Me4cyclen = 1,4,7,10-tetramethyl-1,4,7,10-tetraazacyclododecane). Density functional theory (DFT) calculations, using the BP86 and B3LYP functionals, show that the accessibility of the [M(Me3tacn)2](+) sandwich cations depends strongly on the M(+) ionic radius, such that it is sufficiently large to avoid steric clashing between the Me groups of the two rings, and small enough to avoid very acute N-M-N chelate angles. The calculations also show that coordination to the Group 1 cation involves significant donation of electron density from the p-orbitals on the N atoms of the macrocycle, rather than purely

  4. The PSIMECX medium-energy neutron activation cross-section library. Part 1: Description and procedures for use

    Energy Technology Data Exchange (ETDEWEB)

    Atchison, F.

    1998-09-01

    The PSIMECX library contains calculated nuclide production cross-sections from neutron-induced reactions in the energy range about 2 to 800 MeV in the following 72 stable isotopes of 24 elements: {sup 12}C, {sup 13}C, {sup 16}O, {sup 17}O, {sup 18}O, {sup 23}Na, {sup 24}Mg, {sup 25}Mg, {sup 26}Mg, {sup 27}Al, {sup 28}Si, {sup 29}Si, {sup 30}Si, {sup 31}P, {sup 32}S, {sup 33}S, {sup 34}S, {sup 36}S, {sup 35}Cl, {sup 37}Cl, {sup 39}K, {sup 40}K, {sup 41}K, {sup 40}Ca, {sup 42}Ca, {sup 43}Ca, {sup 44}Ca, {sup 46}Ca, {sup 48}Ca, {sup 46}Ti, {sup 47}Ti, {sup 48}Ti, {sup 49}Ti, {sup 50}Ti, {sup 50}V, {sup 51}V, {sup 50}Cr, {sup 52}Cr, {sup 53}Cr, {sup 54}Cr, {sup 55}Mn, {sup 54}Fe, {sup 56}Fe, {sup 57}Fe, {sup 58}Fe, {sup 58}Ni, {sup 60}Ni, {sup 61}Ni, {sup 62}Ni, {sup 64}Ni, {sup 63}Cu, {sup 65}Cu, {sup 64}Zn, {sup 66}Zn, {sup 67}Zn, {sup 68}Zn, {sup 70}Zn, {sup 92}Mo, {sup 94}Mo, {sup 95}Mo, {sup 96}Mo, {sup 97}Mo, {sup 98}Mo, {sup 100}Mo, {sup 121}Sb, {sup 123}Sb, {sup 204}Pb, {sup 206}Pb, {sup 207}Pb, {sup 208}Pb, {sup 232}Th and {sup 238}U. The energy range covers essentially all transmutation channels other than capture. The majority of the selected elements are principal constituents of normal materials of construction used in and around accelerator facilities and the library is, first and foremost, designed to be a tool for the estimation of their activation in wide-band neutron fields. This first report, from a set of three, describes the form and usage of the library; the other two reports document the calculational methods. The present organisation of the library is the author's first idea and adequate for the intended use (activation calculations); being machine readable, translation of the library into other formats is straightforward. (author)

  5. Role of magnesium oxide and strontium oxide as modifiers in silicate-based bioactive glasses: Effects on thermal behaviour, mechanical properties and in-vitro bioactivity.

    Science.gov (United States)

    Bellucci, Devis; Sola, Antonella; Salvatori, Roberta; Anesi, Alexandre; Chiarini, Luigi; Cannillo, Valeria

    2017-03-01

    The composition of a CaO-rich silicate bioglass (BG_Ca-Mix, in mol%: 2.3 Na2O; 2.3 K2O; 45.6 CaO; 2.6 P2O5; 47.2 SiO2) was modified by replacing a fixed 10mol% of CaO with MgO or SrO or fifty-fifty MgO-SrO. The thermal behaviour of the modified glasses was accurately evaluated via differential thermal analysis (DTA), heating microscopy and direct sintering tests. The presence of MgO and/or SrO didn't interfere with the thermal stability of the parent glass, since all the new glasses remained completely amorphous after sintering (treatment performed at 753°C for the glass with MgO; at 750°C with SrO; at 759°C with MgO and SrO). The sintered samples achieved good mechanical properties, with a Young's modulus ranging between 57.9±6.7 for the MgO-SrO modified composition and 112.6±8.0GPa for the MgO-modified one. If immersed in a simulated body fluid (SBF), the modified glasses after sintering retained the strong apatite forming ability of the parent glass, in spite of the presence of MgO and/or SrO. Moreover, the sintered glasses, tested with MLO-Y4 osteocytes by means of a multi-parametrical approach, showed a good bioactivity in vitro, since neither the glasses nor their extracts caused any negative effect on cell viability or any inhibition on cell growth. The best results were achieved by the MgO-modified glasses, both BGMIX_Mg and BGMIX_MgSr, which were able to exert a strong stimulating effect on the cell growth, thus confirming the beneficial effect of MgO on the glass bioactivity. Copyright © 2016 Elsevier B.V. All rights reserved.

  6. A low background-rate detector for ions in the 5 to 50 keV energy range to be used for radioisotope dating with a small cyclotron

    Energy Technology Data Exchange (ETDEWEB)

    Friedman, P.G.

    1986-11-25

    Accelerator mass spectrometry in tandem Van de Graaff accelerators has proven successful for radioisotope dating small samples. We are developing a 20 cm diameter 30 to 40 keV cyclotron dedicated to high-sensitivity radioisotope dating, initially for /sup 14/C. At this energy, range and dE/dx methods of particle identification are impossible. Thus arises the difficult problem of reliably detecting 30 to 40 keV /sup 14/C at 10/sup -2/ counts/sec in the high background environment of the cyclotron, where lower energy ions, electrons, and photons bombard the detector at much higher rates. We have developed and tested an inexpensive, generally useful ion detector that allows dark-count rates below 10/sup -4/ counts/sec and excellent background suppression. With the cyclotron tuned near the /sup 13/CH background peak, to the frequency for /sup 14/C, the detector suppresses the background to 6 x 10/sup -4/ counts/sec. For each /sup 14/C ion the detectors grazing-incidence Al/sub 2/O/sub 3/ conversion dynode emits about 20 secondary electrons, which are independently multiplied in separate pores of a microchannel plate. The output signal is proportional to the number of secondary electrons, allowing pulse-height discrimination of background. We have successfully tested the detector with positive /sup 12/C, /sup 23/Na, /sup 39/K, /sup 41/K, /sup 85/Rb, /sup 87/Rb, and /sup 133/Cs at 5 to 40 keV, and with 36 keV negative /sup 12/C and /sup 13/CH. It should detect ions and neutrals of all species, at energies above 5 keV, with good efficiency and excellent background discrimination. Counting efficiency and background discrimination improve with higher ion energy. The detector can be operated at least up to 2 x 10/sup -7/ Torr and be repeatedly exposed to air. The maximum rate is 10/sup 6.4/ ions/sec in pulse counting mode and 10/sup 9.7/ ions/sec in current integrating mode.

  7. Physical And Medical Attributes Of Six Contemporary Noninvasive Imaging Techniques

    Science.gov (United States)

    Budinger, Thomas F.

    1981-11-01

    tomography. 6) Nuclear magnetic resonance procedures measure the concentration of some nuclei (e.g., 1H, 23Na, 32P) as well as their chemical state and the local physical-chemical environment of the resolution volume. Velocity and diffusion are also potential measurements. Two unique capabilities of contemporary interest are the ability to image the spatial distribu-tion of relaxation parameters which give information about the local tissue characteristics, and the ability of NMR spectroscopy to sample (not image) the energy state of phosphorous in selected regions of the body. A third attribute of importance is that possible tissue heating seems to be the only hazard and this can be controlled.

  8. 竹材浸渍用酚醛树脂的合成及表征%Synthesis and Characterization of Phenolic Resin for Bamboo Impregnation

    Institute of Scientific and Technical Information of China (English)

    王春霞; 赵磊; 刘浩阳; 张长武; 张晶

    2012-01-01

      A method for obtaining free phenol from resin through distillation and determining the content of free phenol by means of a spectrophotometer is introduced. In the experiment, sodium hydroxide is used as a catalyst and formaldehyde is added gradually to synthetize water-soluble phenolic resin with low free phenol. A single factor experimental method is used to analyze the change in the content of free phenol in the insulation process when the reaction temperature is 55℃and the effect of reactant molar ratio, reaction temperature and formaldehyde content on the free phenol in the synthetic phenolic resin to determine the optimal synthesis process:reaction temperature , 55℃;insulation reaction time, 60 min; F/P Moore ratio, 2.3;NaOH amount ,0.4; Initial addition amount of formaldehyde, 50%.%  介绍了采用蒸馏法及分光光度法测定竹材游离苯酚含量的方法.实验选用氢氧化钠作催化剂,采用一次逐步加入甲醛的方法合成低游离酚的水溶性酚醛树脂.采用单因子试验方法分析了反应温度为55℃时保温过程中游离苯酚含量的变化情况,反应原料摩尔比、催化剂用量、分次加甲醛量对合成酚醛树脂游离苯酚的影响,确定优选的合成工艺为:反应温度55℃;保温反应时间60min;F/P摩尔比2.3;NaOH用量0.4;初次加甲醛量50%.

  9. Nuclear Magnetic Resonance as a Probe of Meso-timescale Dynamics: Ion and H2O Behavior at Mineral-H2O Interfaces

    Science.gov (United States)

    Bowers, G. M.; Kirkpatrick, R. J.; Singer, J. W.

    2012-12-01

    One of the important meso-scales in geochemistry is the meso-timescale that is characteristic of processes too slow to probe with light spectroscopy but too fast to probe macroscopically. Nuclear magnetic resonance (NMR) spectroscopy is one of the only analytical methods with dynamic sensitivity to motions with correlation times on the 10-9 to 1 s timescales and is thus a uniquely powerful probe of meso-timescale dynamic behavior. Here, we describe the results of several studies exploring the meso-timescale motion of ions and H2O at the mineral-H2O interface of hectorite, a smectite clay mineral.1-3 2H, 23Na, 39K and 43Ca NMR results show that H2O molecules associated with the interface undergo anisotropic reorientation due to proximity to the surface and surface-associated cations. This motion can be described by rotational diffusion of the H2O molecule about its C2 symmetry axis at GHz frequencies combined with hopping of the H2O molecule about the normal to the smectite surface at ~>200 kHz. This model describes well the observed 2H NMR spectra of Na+, K+, and Ca2+ hectorites over a range temperatures between -80°C and 50°C, with the specific range dependent only on the total system H2O content. At temperatures above -20°C, systems with excess H2O with respect to a two-layer hydrate (low-H2O pastes through dilute aqueous suspensions) experience additional dynamic averaging due to H2O exchange between cation hydration shells, surface-sorbed species, and bulk inter-particle water. The extent of 2H averaging due to this exchange mechanism is strongly affected by the total H2O content in the system, the identity of the charge balancing cation, and the temperature. The dynamic averaging mechanisms affecting the cationic NMR resonances in these systems become dominated by diffusional processes at progressively lower temperatures as the hydration energy of the cation increases. These interfacial cation dynamics and binding sites are strongly affected by surface

  10. Study of the diffusion of lithium and sodium ions in solids under regardment of the dimensionality of the crystal lattice; Untersuchung der Diffusion von Lithium- und Natrium-Ionen in Festkoerpern unter Beruecksichtigung der Dimensionalitaet des Kristallgitters

    Energy Technology Data Exchange (ETDEWEB)

    Volgmann, Kai Tristan

    2016-07-29

    :TiO{sub 2} two compounds with different dimensionalities determined by their crystal lattice were also studied by solid-state NMR and impedance spectroscopy. In both Li{sub 2}Ti{sub 3}O{sub 7} and Li{sub 2}Ti{sub 6}O{sub 13}, the Li dynamics was in the focus of the studies, but also the Na dynamics in their parent compounds Na{sub 2}Ti{sub 3}O{sub 7} and Na{sub 2}Ti{sub 6}O{sub 13} was investigated. For Na{sub 2}Ti{sub 3}O{sub 7}, {sup 23}Na NMR spectroscopy gave insights into structural and dynamic properties. A detailed {sup 6}Li and {sup 7}Li NMR spectroscopy study on Li{sub 2}Ti{sub 3}O{sub 7} revealed 2D Li diffusion. Macroscopic cation diffusion for both Na{sub 2}Ti{sub 3}O{sub 7} and Li{sub 2}Ti{sub 3}O{sub 7} was investigated using impedance spectroscopy. Furthermore not only Na{sub 2}Ti{sub 6}O{sub 13} and Li{sub 2}Ti{sub 6}O{sub 13} were studied, but also mixed ion conductors with different Na/Li ratios. {sup 6}Li, {sup 7}Li and {sup 23}Na NMR spectroscopy and methods as SLR and SAE were used to explore structure and dynamics of cation diffusion in Li{sub x}Na{sub 2-x}Ti{sub 6}O{sub 13} (x=0,0.33,1,2). A possible 1D cation diffusion was also in the focus of this research. Impedance spectroscopy was again used for the investigation of macroscopic cation diffusion. This method revealed a mixed cation effect in Li{sub x}Na{sub 2-x}Ti{sub 6}O{sub 13}.

  11. Análise comparativa da assembléia de aves em dois remanescentes florestais no interior do Estado de São Paulo, Brasil Comparative analysis of birds community in two forested fragments in the State of São Paulo, Brazil

    Directory of Open Access Journals (Sweden)

    Reginaldo J. Donatelli

    2007-06-01

    Full Text Available Realizou-se o levantamento quantitativo e qualitativo da comunidade de aves de dois fragmentos de floresta estacional semidecídua no interior do estado de São Paulo de julho de 2004 a julho de 2005. Para o estudo quantitativo utilizou-se da metodologia de Pontos de Escuta. Foram analisados os índices de diversidade e de freqüência de ocorrência dessa comunidade. O levantamento qualitativo registrou 181 espécies na Fazenda Rio das Pedras - FRP (Itapetininga, 350 ha e 126 espécies na Fazenda Santa Maria II - FSM (Buri, 480 ha, enquanto que o levantamento quantitativo registrou a presença de 73 espécies em 988 contatos e 64 espécies em 1019 contatos para FRP e FSM, respectivamente. O índice pontual de abundância (IPA variou de 0,01 (1 contato a 1,32 (132 contatos, para FRP e na FSM variou entre 0,01 (1 contato a 0,97 (97 contatos. A diversidade do fragmento da FRP foi de H’ = 3,04 e na FSM de H’ = 2,85 onde a eqüitatividade em ambas áreas foi de 0,91. A comunidade de aves nos fragmentos estudados mostrou o mesmo padrão encontrado em outros fragmentos de floresta estacional semidecídua de tamanhos relativos. As categorias alimentares mais representativas nos dois remanescentes foram insetívoras (53% na FSM e 50% na FRP e frugívoras (23% na FSM e 26% na FRP. Dentre os insetívoros, destacaram-se as famílias Tyrannidae na FSM e Thamnophilidae na FRP. Tanto na FSM como na FRP os insetívoros de sub-bosque foram mais representativos (53% e 51,4% respectivamente, seguidos pelos frugívoros de sub-bosque (50% na FSM e frugívoros de copa (52,6% na FRP. A importância do estudo de comunidade de aves esta ligada à elaboração do plano de manejo e conservação das áreas naturais.Qualitative and quantitative survey of bird community were performed in two distinct semideciduous forest in the interior of the State of São Paulo from July 2004 to July 2005. Point Counts were used for the quantitative survey followed by diversity and

  12. Study of function response of a detector HPGe to photons of reaction {sup 19}F(p,{alpha}{gamma}){sup 16}O; Estudo da funcao resposta de um detetor HPGe a fotons da reacao {sup 19}F(p,{alpha}{gamma}){sup 16}O

    Energy Technology Data Exchange (ETDEWEB)

    Tridapalli, D.B

    2006-07-01

    In the {sup 19}F(p,{alpha}{gamma}){sup 16}O reaction, characteristic gamma-rays with energies: 6.1 MeV; 6.9 MeV and 7.1 keV can be observed. These photons can be used in many important applications such as Proton Induced Gamma-ray Emission (PIGE), gamma radiography and calibration purposes. It has another advantage in calibration procedures, which is the observed photon flux is greater than other reactions studied, {sup 27}Al(p,{alpha}{gamma}){sup 28}Si and {sup 23}Na(p,{alpha}{gamma}){sup 24}Mg. In our laboratory, we are studying the efficiency and response function of HPGe detectors for high energy photons, and for this it is necessary a source with a level scheme with few gamma-ray transitions and known relative yields. The {sup 19}F(p,{alpha}{gamma}){sup 16}O reaction satisfies the first condition but in the literature we found relative yields for thick targets or reaction cross section for thin targets. However, we use targets of intermediate thickness, therefore in this work we measure the relative gamma-ray yields for protons with energies between 1.36 MeV and 1.42 MeV. The experiments were performed at the 1.7 MV Pelletron tandem accelerator of the Laboratorio de Analise de Materiais por Feixes Ionicos (LAMFI) located at Instituto de Fisica da Universidade de Sao Paulo, using a reverse-electrode closed-end coaxial HPGe detector with 72.5 mm in diameter and 60.5 mm in length, at 0 deg. The proton irradiation current was 50 nA, and the target consisted of 250 {mu}g/cm{sup 2} CaF{sub 2} evaporated on a 0.1 mm Ta backing. In this reaction the {sup 20}Ne resonant state fissions in flight, and the resulting {sup 16}O excited states have different half-lives; all observed peaks are deformed due to either Doppler broadening from {sup 16}O random velocity direction or Doppler shift from nuclei that leave the target toward the vacuum chamber. Moreover, the peak deformations vary with the proton energy. These deformations were modeled by a Monte Carlo simulation that

  13. AFCI-2.0 Neutron Cross Section Covariance Library

    Energy Technology Data Exchange (ETDEWEB)

    Herman, M.; Herman, M; Oblozinsky, P.; Mattoon, C.M.; Pigni, M.; Hoblit, S.; Mughabghab, S.F.; Sonzogni, A.; Talou, P.; Chadwick, M.B.; Hale, G.M.; Kahler, A.C.; Kawano, T.; Little, R.C.; Yount, P.G.

    2011-03-01

    materials and fission products, and 20 actinides. Covariances are given in 33-energy groups, from 10?5 eV to 19.6 MeV, obtained by processing with LANL processing code NJOY using 1/E flux. In addition to these 110 files, the library contains 20 files with nu-bar covariances, 3 files with covariances of prompt fission neutron spectra (238,239,240-Pu), and 2 files with mu-bar covariances (23-Na, 56-Fe). Over the period of three years several working versions of the library have been released and tested by ANL and INL reactor analysts. Useful feedback has been collected allowing gradual improvements of the library. In addition, QA system was developed to check basic properties and features of the whole library, allowing visual inspection of uncertainty and correlations plots, inspection of uncertainties of integral quantities with independent databases, and dispersion of cross sections between major evaluated libraries. The COMMARA-2.0 beta version of the library was released to ANL and INL reactor analysts in October 2010. The final version, described in the present report, was released in March 2011.

  14. Abundância e riqueza de espécies de Syrphidae (Diptera em áreas de borda e interior de floresta no Parque Estadual de Vila Velha, Ponta Grossa, Paraná, Brasil Abundance and species richness of Syrphidae (Diptera in the interior and edges of forest in the State Park of Vila Velha, Ponta Grossa, Paraná, Brazil

    Directory of Open Access Journals (Sweden)

    Luciane Marinoni

    2004-12-01

    Full Text Available Com o objetivo de caracterizar a fauna local de insetos foram obtidas amostras semanais, de setembro/1999 a agosto/2000, utilizando-se armadilhas Malaise instaladas na borda da floresta e no seu interior. Uma análise temporal foi realizada com as espécies de Syrphidae coletadas há, aproximadamente, dezessete anos no mesmo local, dentro da floresta. A abundância e a riqueza de espécies também foram avaliadas. Tanto a riqueza quanto a abundância foram maiores na borda da floresta. Comparando-se os dados atuais com aqueles obtidos em 1986/1987, observa-se um decréscimo na abundância e também na riqueza de espécies de Syrphidae. A espécie mais abundante na borda foi Allograpta neotropica Curran, 1936 e no interior (1999/2000, Ocyptamus sativus (Curran, 1941. Os espécimens de Toxomerus Macquart, 1855 foram os mais abundantes na armadilha localizada na borda da floresta e os de Ocyptamus Macquart, 1834 no interior. Noventa e cinco espécies foram identificadas em 22 gêneros. Ocyptamus foi o gênero com maior riqueza de espécies (23. Na seqüência estão Copestylum Macquart, 1846 (15, Toxomerus (15 e Microdon Meigen, 1803 (10. Sete espécies foram comuns aos três levantamentos: Allograpta neotropica; Copestylum selectum (Curran, 1939; Leucopodella gracilis (Williston, 1891; Mixogaster polistes Hull, 1954; Ocyptamus funebris Macquart, 1834; Toxomerus procrastinatus Metz, 2001 e Toxomerus tibicen (Wiedemann, 1830. Três novas espécies de Microdon, uma de Toxomerus, uma de Aristosyrphus Curran, 1941 e uma de Myolepta Newman, 1838 foram identificadas.To characterize the local insect fauna, samples were obtained weekly from September/1999 to August/2000 through Malaise traps installed at the edge and inside the forest. A temporal analysis of Syrphidae species collected approximately 17 years ago at the same local, inside the forest, was made. Also, the abundance and species richness between the areas were analyzed. The syrphids were more

  15. Estudo anatômico das válvulas do tronco gastrocnêmio em cadáveres humanos Anatomical study of valves in the gastrocnemius trunk in human cadavers

    Directory of Open Access Journals (Sweden)

    José Aderval Aragão

    2007-06-01

    Full Text Available CONTEXTO: As válvulas são estruturas características das veias, importantes na orientação do fluxo sangüíneo. Sua presença no sistema venoso superficial dos membros inferiores tem sido bastante estudada. No entanto, nas veias profundas, como a veia gastrocnêmia, a literatura é escassa. OBJETIVO: Realizar um estudo anatômico das válvulas do tronco gastrocnêmio principal em cadáveres humanos adultos. MÉTODOS: Foram dissecados os troncos gastrocnêmios principais de 80 cabeças de músculos gastrocnêmios de 20 cadáveres adultos do sexo masculino, com idade entre 40 e 68 anos, após fixados e mantidos em solução de formol a 10%. Os troncos e tipos de redes foram classificados de acordo com o proposto por Aragão et al. As válvulas foram estudadas quanto ao número, distribuição, localização e tipo com relação ao tronco, perna, cabeça do músculo e tipo de rede gastrocnêmia. RESULTADO: Em 80 cabeças de músculos gastrocnêmios, foram encontrados 95 troncos gastrocnêmios principais, sendo que 17 deles eram duplicados. Foram encontradas 65 válvulas em 60 troncos gastrocnêmios principais, todas elas do tipo bicúspide, sendo 35 na rede tipo I, 23 na do tipo II e sete na rede tipo III. Em 74% dos casos, as válvulas estavam localizadas no terço proximal do tronco gastrocnêmio principal. CONCLUSÃO: As válvulas foram encontradas em todos os tipos de redes que possuíam tronco gastrocnêmio principal, eram todas do tipo bicúspide e se localizaram predominantemente no terço proximal dos troncos gastrocnêmios principais.BACKGROUND: Valves are characteristic structures of veins and are important to guide blood flow. Their presence in the superficial venous system of lower limbs has been well studied. However, there is a lack of published literature on deep veins, such as the gastrocnemius vein. OBJECTIVE: To carry out an anatomical study of the veins in the main gastrocnemius trunk in adult human cadavers. METHODS: The

  16. Fluor-ferro-leakeite, NaNa2(FC2+2Fe3+2Li)Si8O22F2, a new alkali amphibole from the Canada Pinabete pluton, Questa, New Mexico, U.S.A.

    Science.gov (United States)

    Hawthorne, F.C.; Oberti, R.; Ungaretti, L.; Ottolini, L.; Grice, Joel D.; Czamanske, G.K.

    1996-01-01

    Fluor-ferro-leakeite is a new amphibole species from the Canada Pinabete pluton, Questa, New Mexico, U.S.A.; it occurs in association with quartz, alkali feldspar, acmite, ilmenite, and zircon. It forms as anhedral bluish black crystals elongated along c and up to 1 mm long. It is brittle, H = 6, Dmeas = 3.37 g/cm3, Dcalc = 3.34 g/cm3. In plane-polarized light, it is strongly pleochroic, X = very dark indigo blue, Y = gray blue, Z = yellow green; X ??? c = 10?? (in ??obtuse), Y = b, Z ??? a = 4?? (in ?? obtuse), with absorption X > Y > Z. Fluor-ferro-leakeite is biaxial positive, ?? = 1.675(2), ??= 1.683(2), ?? = 1.694(1); 2V = 87(2)??; dispersion is not visible because of the strong absorption. Fluor-ferro-leakeite is monoclinic, space group C2/m, a = 9.792(1), b = 17.938(1), c = 5.3133(4) A??, ??= 103.87(7)??, V = 906.0(1) A??3, Z = 2. The ten strongest X-ray diffraction lines in the powder pattern are [d(I,hkl)]: 2.710(100,151), 2.536(92,202), 3.404(57,131), 4.481(54,040), 8.426(45,110), 2.985(38,241), 2.585(38,061), 3.122(29,310), 2.165(26,261), and 1.586(25,403). Analysis by a combination of electron microprobe, ion microprobe, and crystal-structure refinement (Hawthorne et al. 1993) gives SiO2 51.12, Al2O3 1.13, TiO2 0.68, Fe2O3 16.73, FeO 8.87, MgO 2.02, MnO 4.51, ZnO 0.57, CaO 0.15, Na2O 9.22, K2O 1.19, Li2O 0.99, F 2.87, H2Ocalc 0.60, sum 99.44 wt%. The formula unit, calculated on the basis of 23 O atoms, is (K0.23Na0.76)(Na1.97Ca0.03)(Mg 0.46Fe2+1.4Mn2+0.59Zn0.07Fe3+1.93-Ti 0.08Al0.02Li0.61])(Si7.81Al 0.19)O22(F1.39OH0.61). A previous crystal-structure refinement (Hawthorne et al. 1993) shows Li to be completely ordered at the M3 site. Fluor-ferro-leakeite, ideally NaNa2(Fe2+2Fe3+2Li)Si8O22F2, is related to leakeite, NaNa2(Mg2Fe3+3Li)Si 8O22(OH)2, by the substitutions Fe2+ ??? Mg and F ??? OH.

  17. Role of the serotoninergic system in the sodium appetite control

    Directory of Open Access Journals (Sweden)

    Luís C. Reis

    2007-06-01

    Full Text Available The present article reviews the role of the serotoninergic system in the regulation of the sodium appetite. Data from the peripheral and icv administration of serotoninergic (5-HTergic agents showed the participation of 5-HT2/3 receptors in the modulation of sodium appetite. These observations were extended with the studies carried out after brain serotonin depletion, lesions of DRN and during blockade of 5-HT2A/2C receptors in lateral parabrachial nucleus (LPBN. Brain serotonin depletion and lesions of DRN increased the sodium appetite response, in basal conditions, after sodium depletion and hypovolemia or after beta-adrenergic stimulation as well. These observations raised the hypothesis that the suppression of ascending pathways from the DRN, possibly, 5-HTergic fibers, modifies the angiotensinergic or sodium sensing mechanisms of the subfornical organ involved in the control of the sodium appetite. 5-HTergic blockade in LPBN induced to similar results, particularly those regarded to the natriorexigenic response evoked by volume depletion or increase of the hypertonic saline ingestion induced by brain angiotensinergic stimulation. In conclusion, many evidences lead to acceptation of an integrated participation resulting of an interaction, between DRN and LPBN, for the sodium appetite control.Este artigo revisa o papel do sistema serotoninérgico no controle do apetite ao sódio. Dados derivados da administração periférica e icv de agentes serotoninérgicos demonstraram a participação de receptores 5-HT2/3 na modulação do apetite ao sódio. Estas observações foram estendidas com os estudos realizados após a depleção cerebral de serotonina, lesões do NDR e durante o bloqueio 5-HT2A/2C no núcleo parabraquial lateral (NPBL. A depleção cerebral de serotonina e as lesões do NDR aumentaram o apetite ao sódio, em condições basais, após depleção de sódio, durante a hipovolemia ou após a estimulação beta-adrenérgica. Estas evidências suscitaram a hipótese de que a supressão de vias ascendentes do NDR, possivelmente 5-HT, alteram os mecanismos angiotensinérgicos e a atividade dos sensores de sódio do órgão subfornicial envolvidos no controle do apetite ao sódio. O bloqueio serotoninérgico no NPBL induziu a resultados similares, particularmente aqueles relacionados com a resposta natriorexigênica provocada pela depleção de volume ou o aumento da ingestão de salina hipertônica induzida pela estimulação angiotensinérgica cerebral. Em resumo, as evidências convergem para a admissão de uma participação integrada resultante da interação recíproca entre NDR e NPBL objetivando controlar o apetite ao sódio.

  18. Estudo clínico dos nevos melanocíticos congênitos na criança e no adolescente Clinical study of the congenital melanocytic naevi in the child and adolescent

    Directory of Open Access Journals (Sweden)

    Nurimar Conceição Fernandes

    2009-04-01

    Full Text Available FUNDAMENTOS: a classificação dos nevos melanocíticos congênitos (NMC e a magnitude do risco de transformação em melanoma são ainda polêmicos. OBJETIVOS: Analisar o perfil dos NMC em crianças e adolescentes no IPPMG-UFRJ segundo sexo, cor, idade, tipo clínico, localização e evolução. MATERIAL E MÉTODOS: Estudo longitudinal de coorte retrospectivo e prospectivo de 1994 a 2007; amostra de demanda espontânea e referida. RESULTADOS: 30 crianças e 30 adolescentes apresentaram 74 NMC: 60,8% (pequenos, 27% (médios, 5,4% (grandes e 6,7% (gigantes, sendo que 45,9% no sexo masculino e 54% no sexo feminino e 45,9% em brancos e 54,% em não brancos. Sexo e cor não influenciaram o tipo clínico. Dentre os pequenos e médios, 27,1% apresentaram-se no tórax e 23% na cabeça e pescoço; os grandes e gigantes no pólo cefálico, região cervical, linha média posterior e membros; 28,3% foram seguidos por mais de 10 anos, 47,3% entre três e nove anos e 24,3% por tempo inferior a três anos. Os NMC pequenos e médios se mantiveram inalterados; um grande e dois gigantes mostraram clareamento; nenhum caso desenvolveu melanoma. CONCLUSÃO: distribuição homogênea entre brancos/não brancos e sexo masculino/ feminino. O sexo e a cor não tiveram relação com o tipo clínico; os NMC pequenos predominaram com localização preferencial no tronco.BACKGROUND: The classification of the congenital melanocytic nevus (CMN and the magnitude of the risk of transformation into melanoma are still controversal. OBJECTIVE: To analyse the profile of the CMN in the child and teenager at IPPMG-UFRJ according to sex, skin colour, age, clinical type, locations and evolution. METHODS: Longitudinal study of retrospective and prospective cohort from 1994 to 2007. Aleatoric sample from spontaneous or referal demand. RESULTS: 30 children and 30 teenagers showed 74 nevi: 60,8% (small, 27% (medium, 5,4% (large and 6,7% (giant; from these, 45,9% were in the male sex and

  19. Reconstructing the Chronology of Supernovae: Determining Major Variations in the History of the Cosmic-ray Flux Incident on the Earth's Surface by Measuring the Concentration of 22Ne in Halite

    Science.gov (United States)

    Nahill, N. D.; Giegengack, R.; Lande, K.; Omar, G.

    2008-12-01

    We plan to measure the inventory of cosmogenically produced 22Ne atoms preserved in the mineral lattice of halite in deposits of rock salt, and to use that inventory to measure variations in the cosmic-ray flux to enable us to reconstruct the history of supernovae. Bedded rock salt consists almost entirely of the mineral halite (NaCl). Any neon trapped in the halite crystals during precipitation is primarily 20Ne, with a 22Ne concentration of 9% or less. Any neon resulting from cosmic-ray interactions with 23Na is solely 22Ne; therefore, 22Ne atoms in excess of 9% of the total neon are cosmogenic in origin. Measurement of the 22Ne inventory in halite from deposits covering a range of geologic ages may enable us to document the systematic growth of 22Ne through geologic time and, thus, establish the cosmic-ray flux and a chronology of supernovae. The cosmic-ray flux is attenuated in direct proportion to the mass of material overlying a halite deposit. To adjust the 22Ne inventory to account for that attenuation, we must reconstruct the post-depositional history of accumulation and removal of superjacent sediment for each halite deposit we study. As an example of our procedure, we reconstruct here the shielding history of the Permian halite deposit, the Salado Formation, Delaware Basin, New Mexico. The stratigraphy of the Delaware Basin has been well documented via exploration and production wells drilled in search of oil and gas, exploration boreholes associated with potash mining, and comprehensive geologic site assessment of the DOE Waste Isolation Pilot Plant (WIPP). WIPP is a subsurface repository for the permanent disposal of transuranic wastes, located in southeastern New Mexico, 42 km east of Carlsbad and approximately 655 m beneath the surface in the Salado Fm. The Salado Fm is part of the Late Permian Ochoan Series, and consists of 1) a lower member, 2) the McNutt Potash Zone, and 3) an upper member. WIPP lies between marker bed (MB)139 and MB136 in the

  20. Processamentos de amêndoa e torta de castanha-do-Brasil e farinha de mandioca: parâmetros de qualidade Processing of Brazil nut and meal and cassava flour: quality parameters

    Directory of Open Access Journals (Sweden)

    Maria Luzenira de Souza

    2004-03-01

    Full Text Available A castanha-do-Brasil (Bertholletia excelsa H.B.K. e mandioca (Manihot esculenta Crantz são matérias-primas importantes que constituem a base de subsistência para os povos da região Amazônica. Devido à falta de incentivo às suas utilizações pela indústria de alimentos no mercado interno, buscou-se processar a castanha-do-Brasil para obtenção de amêndoa e torta, e de mandioca para obtenção de farinha, objetivando identificar parâmetros de qualidade que justificassem e incentivassem o apelo aos seus aproveitamentos. Os resultados mostraram que a negatividade de aflatoxinas na amêndoa e torta apontaram a alta qualidade do lote da castanha-do-Brasil em relação a segurança alimentar. Os teores encontrados de selênio 2,04mg/kg na amêndoa e 7,13mg/kg na torta, os percentuais de fibra alimentar de 8,02 na amêndoa, de 15,72 na torta e de 5,68 na farinha, proteína bruta de 40,23% na torta e carboidratos 79,33% na farinha, permitiram caracterizar o produto a base de castanha como protéico, rico em selênio e fibras; e o de mandioca como rico em carboidratos e fibras. A proteína bruta da amêndoa é completa, rica em aminoácidos sulfurados, estando uns aminoácidos em quantidades superiores e outros equivalentes aos do padrão da FAO, podendo a castanha e derivados - devido a estes aminoácidos, ao selênio e fibras - serem considerados um apelo ao seu consumo, pelas funções de grande relevância que desempenham à manutenção da saúde do ser humano.Brazil nut (Bertholletia excelsa H.B.K. and cassava (Manihot esculenta Crantz are important raw materials, which constitute the basis of subsistence for those who live in the Amazon region. Due to a total lack of incentive for their use by the national food industry, this study aimed at processing Brazil nuts to obtain the nuts and the meal and at processing cassava to obtain the flour, studying the quality parameters which could justify and encourage their use. The absence of

  1. AFCI-2.0 Neutron Cross Section Covariance Library

    Energy Technology Data Exchange (ETDEWEB)

    Herman, M.; Herman, M; Oblozinsky, P.; Mattoon, C.M.; Pigni, M.; Hoblit, S.; Mughabghab, S.F.; Sonzogni, A.; Talou, P.; Chadwick, M.B.; Hale, G.M.; Kahler, A.C.; Kawano, T.; Little, R.C.; Yount, P.G.

    2011-03-01

    materials and fission products, and 20 actinides. Covariances are given in 33-energy groups, from 10?5 eV to 19.6 MeV, obtained by processing with LANL processing code NJOY using 1/E flux. In addition to these 110 files, the library contains 20 files with nu-bar covariances, 3 files with covariances of prompt fission neutron spectra (238,239,240-Pu), and 2 files with mu-bar covariances (23-Na, 56-Fe). Over the period of three years several working versions of the library have been released and tested by ANL and INL reactor analysts. Useful feedback has been collected allowing gradual improvements of the library. In addition, QA system was developed to check basic properties and features of the whole library, allowing visual inspection of uncertainty and correlations plots, inspection of uncertainties of integral quantities with independent databases, and dispersion of cross sections between major evaluated libraries. The COMMARA-2.0 beta version of the library was released to ANL and INL reactor analysts in October 2010. The final version, described in the present report, was released in March 2011.

  2. Modelo genéticode los skarns de Fe de Vegas Peladas, Mendoza

    Directory of Open Access Journals (Sweden)

    María Josefina Pons

    2009-06-01

    Full Text Available Datos de inclusiones fluidas(IF indican que el skarn de Fe relacionado al plutón diorítico de VegasPeladas se originó a 3,5 km de profundidad, bajo presiones litostáticas de 950bares y a expensas de fluidos muy salinos (hasta 70% NaCl eq. de altatemperatura (670-400°C. Es muy factible que estos fluidos ricos en NaCl ± KCl± FeCln ± hematita junto con vapor se hayan formado por la inmiscibilidad defluidos magmáticos de salinidad baja (6-8% NaCl eq.. Los datos isotópicos delagua en equilibrio con el granate (δ18O 7,2-8,5‰ y conla magnetita (4,8-7,9‰ confirman el origen magmático de estos fluidos.Debido a la interacción con la caja y a la formación del exoskarn degranate-clinopiroxeno, los fluidos redujeron isobáricamente sus temperaturas(hasta ~250°C. La continua exsolución de volátiles del magma y el sellado delos conductos de circulación de los fluidos por la precipitación de lossilicatos (magnetita del exoskarn y de la alteración del borde delplutón, generaron sobrepresiones, el fracturamiento de las rocas y laebullición del fluido. Bajo condiciones hidrostáticas, el aumento de lapermeabilidad permitió el ingreso de las aguas externas al sistema que semezclaron con los fluidos magmáticos provocando el reemplazo de los silicatospor minerales hidratados, cuarzo (con valores δ18O del fluidode -0,55 a 4,5‰ y la precipitación masiva de óxidos de hierro. Losregistros en inclusiones fluidas señalan temperaturas de 420° a 320°C,presiones hidrostáticas de 325 a 125 bares y fluidos menos salinos (41,6-23%NaCl eq. para este estadio. La disminución de la temperatura y de la salinidadfueron los factores principales que favorecieron la precipitación de la mena deFe. Las venillas tardías que cortan a las alteraciones anteriores se formaron alas temperaturas (165-315°C y salinidades (8,41 y 13,51% NaCl eq. más bajasdel sistema. Los valores δ18O del agua en equilibrio con elepidoto (-4,66 a 0,19‰ y con la calcita

  3. Concentration Mechanism of Ore-Forming Fluid in Huize Lead-Zinc Deposits, Yunnan Province

    Institute of Scientific and Technical Information of China (English)

    Zhang Zhenliang; Huang Zhilong; Rao Bing; Guan Tao; Yan Zaifei

    2005-01-01

    The Huize Pb-Zn deposits of Yunnan Province, located in the south-central part of the Sichuan-Yunnan-Guizhou (SYG) Pb-Zn multimetal mineralization district (MMD), are strictly controlled by fault zones. The sources of ore-forming fluid in the deposits have been debated for a long time. Calcite, a gangue mineral, has uniform C and O isotopes. The δ13CPDB and δ18OSMOW values vary respectively from -2.1×10-3 to -3.5×10-3 (mean -2.8×10-3) and 16.7×10-3-18.6×10-3 (mean 17.7×10-3). No obvious difference can be found in C and O isotopes among occurrences and elevations and even ore-bodies. Types of inclusions include those of pure liquid (L), liquid-rich gas-liquid (L+V), and three-phase ones containing a daughter mineral (S+L+V) and immiscible CO2 with three-phases (VCO2+LCO2+LH2O). Their homogenization temperatures vary from 110 to 400 ℃, and two peaks are shown. (87Sr/86Sr)0 ratios of calcite in the deposits are higher than those in the mantle and Emeishan basalts, and slightly higher than those in the Baizuo Formation, which the Huize lead-zinc deposits are found in. All of the (87Sr/86Sr)0 are low relative to those in the basement rocks. Fractionation of Sr isotope did not occur in the ore-forming fluid during the precipitation of minerals. The results indicate that the ore-forming fluid is homogeneous and derived from the mixing of different fluids. Gas-liquid inclusions can be separated into two groups in 300-400 ℃ with a salinity of 5 %-6 % and 12 %-16 % NaCl respectively. However, the salinities of inclusions vary from 7 % to 23 % NaCl in 100-300 ℃, especially in 150-250 ℃. The formation pressures of faulted zones are (50-320)×105 Pa. The estimated pressures of the overlying rocks on the ore bodies are 574×105-640×105 Pa. The pressures of ore-forming processes would be 145×105 to 754×105 Pa. Therefore, pressure sharply reduced and boiling occurred when the ore-forming fluid flew into the fault zones. As a result, the ore-forming fluid was

  4. Tentativa de avaliação do programa especial de controle da esquistossomose (PECE no Estado da Paraíba, Brasil

    Directory of Open Access Journals (Sweden)

    José Rodrigues Coura

    1987-06-01

    Full Text Available Foi feita uma tentativa de avaliação do Programa Especial de Controle da Esquistossomose (PECE do Ministério da Saúde do Brasil, desenvolvido pela SUCAM no Estado da Paraíba, a partir de 1976. Foram tomadas como base as 5 primeiras avaliações do Programa de 1978 a 1983 e posteriormente em 1984/85 realizados exames quantitativos de fezes em uma amostra de 9.155 indivíduos e exame clínico em 1.036 positivos, em 3 municípios selecionados nas principais regiões hidrográficas, onde o programa vem sendo realizado. As 5 primeiras avaliações realizadas pela SUCAM de 1978 a 1983 nos 47 municípios trabalhados, 23 na região do Mamanguape, 18 na região do Paraíba, 5 na região Litoral Sul e um na região do Curimataú, demonstraram uma queda da prevalência média inicial da esquistossomose de 28% para 4,9% na região do Mamanguape, de 20,9% para 5,9% na região do Paraíba, de 40,2%para 18,9% na região Litoral Sul e de 4,9para 1,4% na região do Curimataú. Em nível de localidade, entretanto, permaneciam com prevalência igual ou superiora 20%, 36(10,9% das 329 avaliadas na região do Mamanguape, 40(13,6% das 293 na região do Paraíba e 43 (47,2% das 91 da região Litoral Sul. Nos municípios tomados como amostra para exame clínico e quantitativo de fezes no ano de 1985 verificou-se que em Cuitegi, na região do Mamanguape, dos 3.494 examinados 154 (4,4% eliminavam em média 123 ovos de S. mansoni por grama de fezes, nenhum tinha a forma hepatoesplênica e 20(12,9% tinham fígado palpável. Em Mari, na região do Paraíba, dos 3.735 examinados 410 (10,9% estavam positivos eliminando em média 165,9 ovos de S. mansoni por grama de fezes; apenas um (0,24% tinha a forma hepatoesplênica e 48 (11,7% tinham fígado palpável. Em Alhandra, na região Litoral Sul, dos 1.926 examinados 472 (24,5% eliminavam em média 115,4 ovos de S. mansoni por grama de fezes, 3,6% eram hepatoesplênicos e 81 (17,1% tinham fígado palpável. Em estudo

  5. Molecular dynamics modeling of carbon dioxide, water and natural organic matter in Na-hectorite.

    Science.gov (United States)

    Yazaydin, A Ozgur; Bowers, Geoffrey M; Kirkpatrick, R James

    2015-09-28

    and CO2 present, the energetic interactions leading to the hydration of the Na-clay surface and the hydrophilic structural elements of the Na-NOM molecule and the hydrophobic interactions between the CO2 and the hydrophobic aromatic and aliphatic structural elements of the NOM can both be satisfied, leading to the Na-NOM molecules migrating away from the surface and residing at the H2O-CO2 interface. The MD results suggest some alternative explanations for the previously observed (23)Na NMR behavior of Na-hectorite at elevated temperatures and CO2 pressures.

  6. Kasatkinite, Ba2Ca8B5Si8O32(OH)3 · 6H2O6, a new mineral from the Bazhenovskoe deposit, the Central Urals, Russia

    Science.gov (United States)

    Pekov, I. V.; Chukanov, N. V.; Filinchuk, Ya. E.; Zadov, A. E.; Kononkova, N. N.; Epanchintsev, S. G.; Kaden, P.; Kutzer, A.; Göttlicher, J.

    2013-12-01

    A new mineral, kasatkinite, Ba2Ca8B5Si8O32(OH)3 · 6H2O, has been found at the Bazhenovskoe chrysotile asbestos deposit, the Central Urals, Russia in the cavities in rhodingite as a member of two assemblages: (l) on prehnite, with pectolite, calcite, and clinochlore; and (2) on grossular, with diopside and pectolite. Kasatkinite occurs as spherulites or bunches up to 3 mm in size, occasionally combined into crusts. Its individuals are acicular to hair-like, typically split, with a polygonal cross section, up to 0.5 mm (rarely, to 6 mm) in length and to 20 μm in thickness. They consist of numerous misoriented needle-shaped subindividuals up to several dozen μm long and no more than 1 μm thick. Kasatkinite individuals are transparent and colorless; its aggregates are snow white. The luster is vitreous or silky. No cleavage was observed; the fracture is uneven or splintery for aggregates. Individuals are flexible and elastic. The Mohs' hardness is 4-4.5. D meas = 2.95(5), D calc = 2.89 g/cm3. Kasatkinite is optically biaxial (+), α = 1.600(5), β = 1.603(2), γ = 1.626(2), 2 V meas = 30(20)°, 2 V calc = 40°. The IR spectrum is given. The 11B MAS NMR spectrum shows the presence of BO4 in the absence of BO3 groups. The chemical composition of kasatkinite (wt %; electron microprobe, H2O by gas chromatography) is as follows: 0.23 Na2O, 0.57 K2O, 28.94 CaO, 16.79 BaO, 11.57 B2O3, 0.28 Al2O3, 31.63 SiO2, 0.05 F, 9.05 H2O, -0.02 -O=F2; the total is 99.09. The empirical formula (calculated on the basis of O + F = 41 apfu, taking into account the TGA data) is: Na0.11K0.18Ba1.66Ca7.84B5.05Al0.08Si8.00O31.80(OH)3.06F0.04 · 6.10H2O. Kasatkinite is monoclinic, space group P21/ c, P2/ c, or Pc; the unit-cell dimensions are a = 5.745(3), b = 7.238(2), c = 20.79 (1) Å, β = 90.82(5)°, V = 864(1) Å3, Z = 1. The strongest reflections ( d Å- I[ hkl]) in the X-ray powder diffractions pattern are: 5.89-24[012], 3.48-2.1[006], 3.36-24[114]; 3.009-100[, 121, ], 2

  7. Investigations of the structure and "interfacial" surface chemistry of Bioglass (RTM) materials by solid-state multinuclear NMR spectroscopy

    Science.gov (United States)

    Sarkar, Gautam

    Bioactive materials such as BioglassRTM 45S5 (45% SiO 2, 24.5% CaO, 24.5% Na2O, and 6% P2O5 by weight) are sodium-phosphosilicate glasses containing independent three-dimensional silicate and phosphate networks and Na+ and Ca2+ ions as modifying cations. Due to their bioactivity, these materials are currently used as implants and for other surgical and clinical applications. The bioactivity of BioglassesRTM is due to their unique capability to form chemical bonds to tissues through an octacalciumphosphate (OCP)- and/or hydroxyapatite-like (HA) "interfacial" matrix. The formation of OCP and/or HA is preceded by the formation of a silica-rich surface layer and the subsequent growth of an amorphous calcium phosphate (a-CP) layer. Structural characterization of a series of commercial and synthesized Bioglass materials 45S5 52S, 55S, 60S, and synthesized 17O-labelled "Bioglass materials 45S, 52S, 55S and 60S" have been obtained using solid-state single-pulse magic-angle spinning (SP/MAS) 17O, 23Na, 29Si and 31P NMR. The 17O NMR isotropic chemical shifts and estimates of the quadrupole coupling constants (Cq) [at fixed asymmetry parameter ( hQ ) values of zero] have been obtained from solid-state spin-echo 17O SP/MAS NMR spectra of 17O-labelled "Bioglasses". The simulation results of these spectra reveal the presence of both bridging-oxygens (BO, i.e. ≡ Si-17OSi ≡ ) and non-bridging oxygens (NBO, i.e. ≡ Si-17O-Na+/Ca2+ ) in the silicate networks in these materials. 17O NMR spectra of these Bioglass materials do not show any direct evidence for the presence of BO and NBO atoms in the phosphate units; however, they are expected to be present in small amounts. In vitro reactions of BioglassRTM 45S5, 60S and 77S powders have been used to study the "interfacial" surface chemistry of these materials in simulated body-fluid (SBF, Kyoto or K9 solution) and/or 17O-enriched tris-buffer solution. 29Si and 31P SP/MAS NMR have been used to identify and quantify the extent of

  8. Improved performances of the fast reactor calculational system ERANOS-ERALIB1 due to improved a priori nuclear data and consideration of additional specific integral data

    Energy Technology Data Exchange (ETDEWEB)

    Fort, E. E-mail: eric.fort@cea.fr; Rimpault, G.; Bosq, J-C.; Camous, B.; Zammit, V.; Dupont, E.; Jacqmin, R.; Smith, P.; Biron, D. E-mail: didier.biron@edf.fr; Verrier, D. E-mail: dverrier@framatome.fr

    2003-12-01

    A single consistent scheme of calculational methods and nuclear data called ERANOS-ERALIB1 was produced in 1996 to calculate fast reactor neutronic parameters. It represents a significant improvement on previous schemes such as CARNAVAL-IV, PROPANE and VASCO, each of which were required in order to calculate one specific application. The nuclear data library ERALIB1 has been obtained by a consistent statistical adjustment based on 355 integral data from 71 different systems. The performance of ERALIB1 is excellent, as demonstrated during its validation for which all the k{sub eff} SUPER-PHENIX data were reproduced to within 70 pcm. The only restriction on this satisfactory performance is related to the rather poor prediction of the sodium void reactivity effect. This was due to very bad nuclear data for {sup 23}Na, and the unsatisfactory methods used to calculate the sensitivity coefficients for the sodium void reactivity variation {delta}{rho}{sub Na}. To improve the performance relative to this point and to enlarge the domain of validation several actions have been undertaken: - a revision of the formalism and algorithms used to calculate the derivatives of {delta}{rho}{sub Na} to the sodium cross section data,; - a significant enlargement of the integral data base related to this aspect of the sodium void effect. Compared to the initial data base established in support of ERALIB1, several additional (18) sodium void configurations corresponding to voids of different volumes at different core locations have been studied. In order to broaden the range of application of the improved library, which will be called ERALIB1.A, significant effort has been devoted to additional configurations which have firstly been evaluated, and then if judged suitable, included in the adjustment process. They are related to two specifically targeted experimental programmes: - a study of neutron deep penetration. Several configurations of the JANUS experimental programme (shielding

  9. Impact of Na ordering on the electronic properties of the Co planes in NaxCoO2

    Science.gov (United States)

    Alloul, Henri

    2010-03-01

    In 2003 superconductivity at 4.5K has been discovered in Na0.35CoO2,1.3H2O, a hydrated cobaltate. These layered cobaltates NaxCoO2 have some analogies with the cuprates, as 2D conductivity occurs in the CoO2 planes, where the Co are arranged on a triangular lattice, and doping can be modified by changing the Na content. But, contrary to the case of most cuprates for which dopant induced disorder is quite influential, the doping achieved in cobaltate samples is associated with the insertion of well ordered 2D Na structures and even 3D ordered stacks of the Na/Co planes. We found that the correlations between magnetic properties and Na structural order are uniquely probed locally through NMR/NQR measurements on both ^23Na and ^59Co nuclei. The Na ordering appears responsible for very distinct electronic ground state properties of the metallic CoO2 planes, which do exhibit ferromagnetic in plane correlations for x> 0.62 up to the highest Na content (except for x=1 which is a band insulator). These metallic ferromagnetic correlations do not yield any static magnetic order down to T=0^(1) for x0.5, the nature of the ground state and the anomalous magnetic properties are found to be linked with a charge segregation which localizes an ordered array of non magnetic Co^3+ sites in a metallic Co background responsible for the magnetic properties^(5). This is contrary to many expectations for which Na order was expected to pin local magnetic moments in a metallic and less magnetic bath. NMR/ NQR experiments have allowed us recently to determine the atomic structure of the x=2/3 phase. We demonstrated that the associated Co charge order is somewhat peculiar as the nearly ferromagnetic metallic state results of hole delocalization on a simple kagome lattice of Co sites^(6). Further efforts to determine the actual arrangement of the non magnetic cobalt sites for different Na concentrations is presently undertaken and should give hints to link the ground state properties with the

  10. Úvodník 2009/IV/3

    Directory of Open Access Journals (Sweden)

    Jana Dlouhá

    2009-12-01

    schopnosti přírodní jevy pozorovat, orientovat se jimi a pak je také ukládat do paměti anebo řadit do systému kategorií. Popisuje způsoby, jak tyto vlohy dále rozvíjet, uvádí též důsledky, které by jejich potlačování mohlo přinášet. Podobným tématem viděným ovšem z perspektivy jedince dospělého a (ontogeneticky i fylogeneticky rozvinutého se zabývá Jana Krčmářová v článku Hypotéza biofilie Edwarda O. Wilsona; přináší zde pohled na možné příčiny lidského vnímání a rozumění různým přírodním jevům. Jak říká autorka, biofilie je buď „vrozeným pocitem, že jsem součástí života" (spočívajícím v prociťování fylogenetické příbuznosti všeho života na Zemi, nebo „vrozeným soustředěním na jiné životní formy" (tedy evolučním uzpůsobením lidské mysli, usměrňujícím vztahy k přírodním jevům. A jako taková může dodnes ovlivňovat náš pohled na přírodní hodnoty, i naše chování vůči přírodě... ...ale také působit příznivě na psychický rozvoj, jsou-li emoce s ní související dostatečně stimulovány. Například humánně-animální interakce pak mohou mít vliv terapeutický a lze je využít výchovně; v zemích západní Evropy i u nás se stávají jednou z cest zmírňování prohlubujícího se odcizování člověka přírodě. Tuto problematiku, konkrétně zaměřenou na zooasistence v pedagogické praxi, rozebírá Kateřina Jančaříková, která prezentuje též relevantní výzkum a na jeho základě vytvořený postgraduální kurz na Pedagogické fakultě UK v Praze. Má-li být proměna, o kterou usilujeme, činem odpovědným, pak je zapotřebí ji reflektovat a hodnotit. Jan Činčera v textu Evaluace pobytového programu Podblanického ekocentra seznamuje s metodikou výzkumu a jeho výsledky, které byly následně využity ke zlepšení programu ovlivňujícího především znalosti a chování žáků ve spotřebitelské oblasti

  11. Role of Carboxylate ligands in the Synthesis of AuNPs: Size Control, Molecular Interaction and Catalytic Activity

    KAUST Repository

    Aljohani, Hind Abdullah

    2016-05-22

    then describe the effect of the concentrations and of various type of the stabilizer, and the post-synthesis treatment on gold nanoparticles size. In Chapter 4, we focus on determining the nature of the interactions at molecular level between citrate (and other carboxylate-containing ligands) and AuNP in terms of the mode of coordination at the surface, and the formal oxidation state of Au when interacting with these negatively charged carboxylate ligands (i.e., LX- in the Green formalism). We achieve this by combining very advanced 13C CP/MAS, 23Na MAS and low-temperature SSNMR, high-resolution transmission electron microscopy (HRTEM) and density functional theory (DFT) calculations. A particular emphasis will be based on SS-NMR. In Chapter 5, we study the influence of pretreatment of 1% Au/TiO2 catalysts on the resulting activity in the oxidation of carbon monoxide, the effect of the concentration and the type of the ligands on the catalytic activity. The catalysts were characterized by TPO, XRD, and TEM spectroscopy.

  12. Cirurgia de revascularização do miocárdio associada a endarterectomia de carótida Combined operation for myocardial revascularization and carotid endarterectomy

    Directory of Open Access Journals (Sweden)

    Januário M Souza

    1995-03-01

    Full Text Available A oportunidade para realização de endarterectomia de carótida (EC e revascularização do miocárdio (RM para doença concomitante ainda é controversa. Entre 1979 e 1994, 10940 pacientes foram operados para revascularização do miocárdio. Cirurgia combinada RM/EC foi realizada em 46 (0,43% pacientes, no mesmo período. A idade variou de 48 a 76 anos, média de 65,2 anos, sendo 34,7% (16/46 com 70 anos ou mais; 80,4% eram do sexo masculino. Infarto do miocárdio prévio estava presente em 23 (50% pacientes. Diabetes mellitus em 10 (21,7%, insuficiência renal crônica em 5 (10,8%; 29 (63% estavam em classe funcional III ou IV para angina; havia ICC em 4 (8,6%, lesão obstrutiva significativa em 9 (19,5% pacientes em tronco da coronária esquerda; 5 pacientes estavam sendo reoperados para RM e 1 para RM e EC. Dos 25 pacientes com lesão carotídea bilateral, 4 tinham uma artéria carótida interna ocluída. Vinte e três pacientes tinham tido isquemia cerebral transitória (ICT e 2 pacientes acidente vascular cerebral (AVC com seqüela permanente; 21 não tinham manifestação neurológica. Endarterectomia de carótida foi realizada na carótida esquerda em 23, na direita em 14 e bilateral em 9. A RM foi realizada com pontes de safena e artéria torácica interna (ATI, variando de 1 a 4 pontes, com média de 2,8 pontes por paciente; 11 receberam ATI. A mortalidade imediata foi de 8,6% (4/46; AVC permanente não ocorreu no trans-operatório. Três dos 4 óbitos ocorreram em pacientes com idade igual ou superior a 70 anos. A EC foi realizada após preparo e heparinização do paciente para circulação extracorpórea (CEC. Nos 4 pacientes que apresentavam oclusão da artéria carótida interna contralateral a EC foi realizada após o estabelecimento da CEC com hipotermia sistêmica 25º C. Em nenhum caso foi utilizado sfrunf carotídeo. Nos casos de lesões cirúrgicas bilaterais, o lado com lesão de maior risco foi operado juntamente com a

  13. A aplicação de nitrogênio ao solo em diferentes estádios não afetou o rendimento de frutos de cultivares de macieira Application of nitrogen to the soil in different stages did not affect on fruit yield of apple cultivars

    Directory of Open Access Journals (Sweden)

    Paulo Roberto Ernani

    2000-04-01

    Full Text Available Tanto o excesso quanto a deficiência de N causam efeitos negativos na produtividade e na qualidade dos frutos de macieira. Como a taxa de absorção de N pelas árvores de macieira é afetada pela demanda das mesmas, dentro da estação de crescimento, e pelo N disponível no solo, é importante conhecer a necessidade da adição suplementar desse nutriente e a melhor época para aplicá-lo. O presente trabalho objetivou avaliar o efeito da época de aplicação de N ao solo na produtividade de frutos de duas cultivares de macieira. Os experimentos, um para a Gala e outro para a Fuji, foram conduzidos de 1990 a 1996, em Vacaria, RS, num pomar plantado em 1988, na densidade de1481 árvores ha-1, sobre um Latossolo bruno com 4,0% de matéria orgânica, 60% de argila e pH 6,9. Os tratamentos constaram de 50kg de N ha-1 nos três primeiros anos, e 60kg de N ha-1 nas outras três safras, aplicados no inchamento das gemas (IG, ou na queda de pétalas (QP, ou dividido 2/3 no IG + 1/3 na QP, ou 2/3 na QP + 1/3 trinta dias após. O N foi sempre aplicado sobre a superfície do solo, sem incorporação, numa faixa de 2,0m ao longo da fila de plantio. Houve também um tratamento sem a aplicação de N. A produtividade média anual de frutos variou de 40 a 112t ha-1 para a cultivar Gala e de 38 a 76t ha-1 para a Fuji, e a produtividade média da Gala, no período, foi 35% superior à da Fuji. A aplicação de N ao solo, independentemente da época, não teve efeito na produtividade de frutos, no tamanho das brotações, na concentração de N nas folhas e no diâmetro do tronco das duas cultivares. Presume-se, portanto, que a quantidade de N liberada a partir da decomposição da matéria orgânica do solo foi suficiente para atender à demanda das plantas e permitir uma alta produtividade de frutos de macieira.Excess or deficiency of N have deleterious effects on apple yield and fruit quality. Since the rate of N uptake by apple trees depends on crop requirement within the season and on N available in the soil, it is important to know the need for supplemental N addition and the best application time. This study was carried out to evaluate the effect of timing of N application to the soil on fruit yield of apple cultivars. The experiments, one for 'Gala' and other for 'Fuji', were conducted from 1990 to 1996 in an orchard planted in 1988, with a density of 1481 trees ha-1, in an Oxisol with pH of 6.9, 4,0% of organic matter, and 60% of clay. Nitrogen treatments (50kg ha-1 year-1 during the first three growing seasons, and 60kg ha-1 year-1 afterwards were applied at bud break (BB, or at petal fall (PF, or split 2/3 at BB + 1/3 at PF, or 2/3 at PF + 1/3 thirty-days later, always broadcast over the soil surface, without incorporation, in a 2-m-wide strip in the planting row. There was also a treatment without N addition. Average annual fruit yield varied from 40 to 112t ha-1 for 'Gala', and from 38 to 84t ha-1 for 'Fuji', and in the entire period it was 35% greater for 'Gala' than for 'Fuji'. Application of N to the soil, regardless of timing, had no effect on fruit yield, on N content in the leaves, and on canopy growth of both cultivars, in any year evaluated. It was assumed that N released from soil organic matter decay was sufficient to promote normal growth and high fruit productivity for these two apple cultivars.

  14. Modelo genéticode los skarns de Fe de Vegas Peladas, Mendoza Genetic model of the Vegas PeladasFe-sakarns, Mendoza, Argentina

    Directory of Open Access Journals (Sweden)

    María Josefina Pons

    2009-06-01

    Full Text Available Datos de inclusiones fluidas(IF indican que el skarn de Fe relacionado al plutón diorítico de VegasPeladas se originó a 3,5 km de profundidad, bajo presiones litostáticas de 950bares y a expensas de fluidos muy salinos (hasta 70% NaCl eq. de altatemperatura (670-400°C. Es muy factible que estos fluidos ricos en NaCl ± KCl± FeCln ± hematita junto con vapor se hayan formado por la inmiscibilidad defluidos magmáticos de salinidad baja (6-8% NaCl eq.. Los datos isotópicos delagua en equilibrio con el granate (δ18O 7,2-8,5‰ y conla magnetita (4,8-7,9‰ confirman el origen magmático de estos fluidos.Debido a la interacción con la caja y a la formación del exoskarn degranate-clinopiroxeno, los fluidos redujeron isobáricamente sus temperaturas(hasta ~250°C. La continua exsolución de volátiles del magma y el sellado delos conductos de circulación de los fluidos por la precipitación de lossilicatos (magnetita del exoskarn y de la alteración del borde delplutón, generaron sobrepresiones, el fracturamiento de las rocas y laebullición del fluido. Bajo condiciones hidrostáticas, el aumento de lapermeabilidad permitió el ingreso de las aguas externas al sistema que semezclaron con los fluidos magmáticos provocando el reemplazo de los silicatospor minerales hidratados, cuarzo (con valores δ18O del fluidode -0,55 a 4,5‰ y la precipitación masiva de óxidos de hierro. Losregistros en inclusiones fluidas señalan temperaturas de 420° a 320°C,presiones hidrostáticas de 325 a 125 bares y fluidos menos salinos (41,6-23%NaCl eq. para este estadio. La disminución de la temperatura y de la salinidadfueron los factores principales que favorecieron la precipitación de la mena deFe. Las venillas tardías que cortan a las alteraciones anteriores se formaron alas temperaturas (165-315°C y salinidades (8,41 y 13,51% NaCl eq. más bajasdel sistema. Los valores δ18O del agua en equilibrio con elepidoto (-4,66 a 0,19‰ y con la calcita

  15. Structure and properties of α-NaFeO{sub 2}-type ternary sodium iridates

    Energy Technology Data Exchange (ETDEWEB)

    Baroudi, Kristen, E-mail: kbaroudi@princeton.edu [Department of Chemistry, Princeton University, Princeton, NJ 08544 (United States); Yim, Cindi [Department of Chemistry, Princeton University, Princeton, NJ 08544 (United States); Wu, Hui [NIST Center for Neutron Research, Gaithersburg, MD 20899-6102 (United States); Department of Materials Science and Engineering, University of Maryland, College Park, MD 20742-2115 (United States); Huang, Qingzhen [NIST Center for Neutron Research, Gaithersburg, MD 20899-6102 (United States); Roudebush, John H. [Department of Chemistry, Princeton University, Princeton, NJ 08544 (United States); Vavilova, Eugenia [Leibniz Institute for Solid State and Materials Research IFW, Dresden (Germany); Zavoisky Physical Technical Institute, Russian Academy of Sciences, Kazan (Russian Federation); Grafe, Hans-Joachim; Kataev, Vladislav [Leibniz Institute for Solid State and Materials Research IFW, Dresden (Germany); Buechner, Bernd [Leibniz Institute for Solid State and Materials Research IFW, Dresden (Germany); Institut für Festkörperphysik, Technische Universität Dresden, Dresden (Germany); Ji, Huiwen [Department of Chemistry, Princeton University, Princeton, NJ 08544 (United States); Kuo, Changyang; Hu, Zhiwei; Pi, Tun-Wen [Max Planck Institute for Chemical Physics of Solids, Nöthnitzer Straße 40, 01187 Dresden (Germany); Pao, Chiwen; Lee, Jyhfu [National Synchrotron Radiation Research Center, Hsinchu 30076, Taiwan, ROC (China); Mikhailova, Daria; Hao Tjeng, Liu [Max Planck Institute for Chemical Physics of Solids, Nöthnitzer Straße 40, 01187 Dresden (Germany); Cava, R.J. [Department of Chemistry, Princeton University, Princeton, NJ 08544 (United States)

    2014-02-15

    The synthesis, structure, and elementary magnetic and electronic properties are reported for layered compounds of the type Na{sub 3−x}MIr{sub 2}O{sub 6} and Na{sub 3−x}M{sub 2}IrO{sub 6}, where M is a transition metal from the 3d series (M=Zn, Cu, Ni, Co, Fe and Mn). The rhombohedral structures, in space group R−3m, were determined by refinement of neutron and synchrotron powder diffraction data. No clear evidence for long range 2:1 or 1:2 honeycomb-like M/Ir ordering was found in the neutron powder diffraction patterns except in the case of M=Zn, and thus in general the compounds are best designated as sodium deficient α-NaFeO{sub 2}-type phases with formulas Na{sub 1−x}M{sub 1/3}Ir{sub 2/3}O{sub 2} or Na{sub 1−x}M{sub 2/3}Ir{sub 1/3}O{sub 2}. Synchrotron powder diffraction patterns indicate that several of the compounds likely have honeycomb in-plane metal–iridium ordering with disordered stacking of the layers. All the compounds are sodium deficient under our synthetic conditions and are black and insulating. Weiss constants derived from magnetic susceptibility measurements indicate that Na{sub 0.62}Mn{sub 0.61}Ir{sub 0.39}O{sub 2}, Na{sub 0.80}Fe{sub 2/3}Ir{sub 1/3}O{sub 2}, Na{sub 0.92}Ni{sub 1/3}Ir{sub 2/3}O{sub 2}, Na{sub 0.86}Cu{sub 1/3}Ir{sub 2/3}O{sub 2}, and Na{sub 0.89}Zn{sub 1/3}Ir{sub 2/3}O{sub 2} display dominant antiferromagnetic interactions. For Na{sub 0.90}Co{sub 1/3}Ir{sub 2/3}O{sub 2} the dominant magnetic interactions at low temperature are ferromagnetic while at high temperatures they are antiferromagnetic; there is also a change in the effective moment. Low temperature specific heat measurements (to 2 K) on Na{sub 0.92}Ni{sub 1/3}Ir{sub 2/3}O{sub 2} indicate the presence of a broad magnetic ordering transition. X-ray absorption spectroscopy shows that iridium is at or close to the 4+ oxidation state in all compounds. {sup 23}Na nuclear magnetic resonance measurements comparing Na{sub 2}IrO{sub 3} to Na{sub 0.92}Ni{sub 1/3}Ir

  16. Prevalência de quedas em idosos asilados do município de Rio Grande, RS Prevalence of falls in institutionalized elderly in Rio Grande, Southern Brazil

    Directory of Open Access Journals (Sweden)

    Lílian Gatto Gonçalves

    2008-10-01

    Full Text Available OBJETIVO: O aumento da expectativa de vida nos países em desenvolvimento tem provocado preocupação com a qualidade de vida e o bem-estar dos idosos, principalmente a ocorrência de quedas. Nesse sentido, o objetivo do estudo foi descrever a prevalência de quedas em idosos que vivem em asilos e fatores associados. MÉTODOS: Estudo de delineamento transversal na cidade de Rio Grande (RS, em 2007. Participaram 180 indivíduos idosos (65 anos ou mais residentes em asilos para acolhimento. Em entrevista, os idosos responderam a questões de instrumento pré-testado sobre a ocorrência de quedas. Além de análise bivariada (Wald, foi realizada análise por regressão de Poisson com cálculo de razões de prevalência e intervalos de confiança de 95%, ajustada para as variáveis de confusão. RESULTADOS: A prevalência de quedas entre os idosos asilados estudados foi de 38,3%. As quedas foram mais comuns no ambiente do asilo (62,3%, sendo o quarto o ambiente onde ocorreu o maior número de quedas (23%. Na análise ajustada, as quedas se mantiveram associadas com cor da pele branca, com os idosos separados e divorciados, com depressão, e maior quantidade referida de medicamentos para uso contínuo. CONCLUSÕES: O estudo mostra que a prevalência de quedas entre idosos asilados é alta. Embora alguns dos possíveis fatores associados sejam passíveis de prevenção, ainda ocorrem quedas em locais que deveriam ser considerados seguros, como o quarto do idoso.OBJETIVO: El aumento de la expectativa de vida en los países en desarrollo ha provocado preocupación con la calidad de vida y el bienestar de los ancianos, principalmente la ocurrencia de caídas. En ese sentido, el objetivo del estudio fue describir la prevalencia de caídas en ancianos que viven en asilos y factores asociados. MÉTODOS: Se realizó estudio de delineamiento transversal en la ciudad de Rio Grande (Sur de Brasil, en 2007. Participaron 180 individuos ancianos (65 años o mas

  17. Úvodník

    Directory of Open Access Journals (Sweden)

    Jana Dlouhá

    2013-09-01

    ýká se i jejich širšího kulturního kontextu a politických podmínek ve specificky českém prostředí. S ohledem na udržitelný rozvoj společnosti se soustavně zabýváme jeho bariérami – které brání hlubším změnám ve společenských zvyklostech a pravidlech, životním stylu, nebo eticky podložených přístupech a způsobech rozhodování; soustřeďujeme se na naši oblast expertizy, kde čerstvé myšlenky, metody výuky/učení, nové postupy hodnocení atd. mohou být inspirací pro kritický pohled na systém vzdělávání jako takový. Snažíme se stát součástí mezinárodního společenství EV i VUR, přičemž současně očekáváme jeho podporu; všechny zásadnější změny či inovace jsou totiž založeny na širších diskusích (v našem případě vedených v evropském měřítku, teoretických úvahách, sdílených strategiích a společných iniciativách. A také doufáme v podíl zahraničních kolegů (z dalších zemí střední a východní Evropy jakož i odjinud na obsahu i přípravě dalších čísel Envigogiky.Během posledních týdnů jsme také usilovali o zlepšení formy časopisu, a tím i jeho postavení mezi časopisy v mezinárodním měřítku. Součástí tohoto vývoje bylo převedení celého obsahu Envigogiky z původního systému (Joomla do nového, tzv. Open Journal System (OJS [1] – „otevřeného“ systému pro správu a publikování časopisů. Tento systém pomáhá v každé fázi publikačního procesu: od zasílání/přijímání příspěvků, přes recenzní řízení a publikační proces v elektronickém prostředí, až po indexování.Využití OJS znamená pro Envigogiku kvalitativní krok kupředu – nyní se metadata z jednotlivých článků okamžitě načtou do EndNote, Zotera a dalších systémů správy referencí; časopis je již v tuto chvíli indexoán v Google Scholaru, a v nejbližší budoucnosti jej plánujeme zařadit do dalších důležitých datab