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Sample records for na yadrakh 6li

  1. Transport properties derived from ion-atom collisions: 6Li-6Li+ and 6Li-7Li+ Cases

    Science.gov (United States)

    Bouledroua, Moncef; Bouchelaghem, Fouzia; LPR Team

    2014-10-01

    This investigation treats quantum-mechanically the ion- atom collisions and computes the transport coefficients, such as the coefficients of mobility and diffusion. For the case of lithium, the calculations start by determining the gerade and ungerade potential curves through which ionic lithium approaches ground lithium. Then, by considering the isotopic effects and nuclear spins, the elastic and charge-transfer cross sections are calculated for the case of 6Li+and7Li+ colliding with 6Li. Finally, the temperature-dependent diffusion and mobility coefficients are analyzed, and the results are contrasted with those obtained from literature. The main results of this work have been recently published in. This work has been realized within the frames of the CNEPRU Project D01120110036 of the Algerian Ministry of Higher Education.

  2. 6Li foil thermal neutron detector

    Energy Technology Data Exchange (ETDEWEB)

    Ianakiev, Kiril D [Los Alamos National Laboratory; Swinhoe, Martyn T [Los Alamos National Laboratory; Favalli, Andrea [Los Alamos National Laboratory; Chung, Kiwhan [Los Alamos National Laboratory; Macarthur, Duncan W [Los Alamos National Laboratory

    2010-01-01

    In this paper we report on the design of a multilayer thermal neutron detector based on {sup 6}Li reactive foil and thin film plastic scintillators. The {sup 6}Li foils have about twice the intrinsic efficiency of {sup 10}B films and about four times higher light output due to a unique combination of high energy of reaction particles, low self absorption, and low ionization density of tritons. The design configuration provides for double sided readout of the lithium foil resulting in a doubling of the efficiency relative to a classical reactive film detector and generating a pulse height distribution with a valley between neutron and gamma signals similar to {sup 3}He tubes. The tens of microns thickness of plastic scintillator limits the energy deposited by gamma rays, which provides the necessary neutron/gamma discrimination. We used MCNPX to model a multilayer Li foil detector design and compared it with the standard HLNCC-II (18 {sup 3}He tubes operated at 4 atm). The preliminary results of the {sup 6}Li configuration show higher efficiency and one third of the die-away time. These properties, combined with the very short dead time of the plastic scintillator, offer the potential of a very high performance detector.

  3. Triple α resonances in the 6Li + 6Li → 3α reaction at low energy

    Directory of Open Access Journals (Sweden)

    A. Tumino

    2015-11-01

    Full Text Available The 6Li + 6Li → 3α reaction has been measured in a kinematically complete experiment at 3.1 MeV of beam energy. The reaction mainly proceeds via intermediate 8Be states. The interaction between any two of the three α particles provides events with one, two or three 8Be interfering levels, with strong enhancement in the α–α coincidence yield. Evidence of three 8Be levels within the same 3α event suggests that one α particle is exchanged between the other two. This is a condition for Efimov states to occur in nuclei, for which no observation exists yet. The hyperspherical formalism for the low-energy three-body problem has been applied to point out the 3α particle correlation.

  4. Diffusion of $^{6}$Li in Ta and W

    CERN Document Server

    Vacik, J

    2006-01-01

    The objective of this work was the study of 6Li diffusion in the Ta and W refractory metals. The samples were prepared by ion implantation of 380 keV 6Li+ ions into W and Ta thin foils (up to the fluence of 1016 ions/cm2) and annealed up to the temperature 1940 °C. The depth profiles of 6Li were determined using the Thermal Neutron Depth Profiling (TNDP) technique. The results showed that diffusion of 6Li in both W and Ta foils is very complex and cannot be described by simple Fick’s laws. Trapping centers (in the subsurface layers of both W and Ta metals) were supposed in a trial to explain the 6Li diffusion behaviour. However, the 6Li depth profiles were only partly explained. Other aspects are necessary to take into account for more proper quantification; such as spatially dependent diffusion coefficients, etc.

  5. 6^Li in the atmosphere of GJ 117

    CERN Document Server

    Christian, D J; Jevremovic, D; Hauschildt, P H; Baron, E

    2005-01-01

    We present high resolution VLT UVES observations of the active K dwarf GJ 117. 6^Li enhancement has been shown for energetic solar events, one chromospherically active binary, and several dwarf halo stars. Our analysis reveals the detection of 6^Li on this source with 6^Li/7^Li = 0.030+/-0.010. We found no significant contribution from other lines, including Ti I, in the Li profile of GJ 117 and a template star of similar spectral type and metallicity. We discuss the possibility for 6^Li production by spallation and find it to be consistent with the activity levels of the object.

  6. Four-body dynamics in 6Li elastic scattering

    CERN Document Server

    Watanabe, Shin; Ogata, Kazuyuki; Yahiro, Masanobu

    2015-01-01

    We analyze 6Li elastic scattering in a wide range of incident energies (Ein), assuming the n + p + alpha + target four-body model and solving the dynamics with the four-body version of the continuum-discretized coupled-channels method (CDCC). Four-body CDCC well reproduces the experimental data with no adjustable parameter for 6Li + 209Bi scattering at Ein = 24-50 MeV and 6Li + 208Pb scattering at Ein = 29-210 MeV. In the wide Ein range, 6Li breakup is significant and provides repulsive corrections to the folding potential. As an interesting property, d breakup is strongly suppressed in 6Li-breakup processes independently of Ein. We investigate what causes the d-breakup suppression.

  7. Crystal structure of a new variety of lead dodecaborate Pb{sub 6}(Li{sub 0.65}Na{sub 0.19})[B{sub 12}O{sub 24}]I{sub 0.84} {center_dot} 0.168H{sub 2}O and its comparison with beryl and cordierite

    Energy Technology Data Exchange (ETDEWEB)

    Belokoneva, E. L., E-mail: elbel@geol.msu.ru; Derkach, I. K.; Dimitrova, O. V. [Moscow State University, Faculty of Geology (Russian Federation)

    2013-05-15

    Crystals of a new representative of ring-radical dodecaborates Pb{sub 6}(Li{sub 0.65}Na{sub 0.19})[B{sub 12}O{sub 24}]I{sub 0.84} {center_dot} 0.168H{sub 2}O, space group R3bar m , are obtained under hydrothermal conditions. The structure is determined with-out preliminary knowledge of the chemical formula. It is close to that of the Pb{sub 6}[B{sub 12}O{sub 24}] {center_dot} H{sub 2}O dodecaborate studied earlier, but unlike the latter structure it contains admixtures of iodide anion, lithium cation, and water molecule, which incompletely populate positions in channels. The formation of the second variety, which brings to light ion-exchange properties of the crystals, is due to mineralizing ions available in the concen-trated solution in the course of crystallization. The new compound is compared with beryl and cordierite, which have close structures with channels capable of capturing various groups. Structures of synthetic Na and Ag dodecaborates with analogous but distorted ring dodecaborate radicals are discussed.

  8. Big Bang 6Li nucleosynthesis studied deep underground (LUNA collaboration)

    Science.gov (United States)

    Trezzi, D.; Anders, M.; Aliotta, M.; Bellini, A.; Bemmerer, D.; Boeltzig, A.; Broggini, C.; Bruno, C. G.; Caciolli, A.; Cavanna, F.; Corvisiero, P.; Costantini, H.; Davinson, T.; Depalo, R.; Elekes, Z.; Erhard, M.; Ferraro, F.; Formicola, A.; Fülop, Zs.; Gervino, G.; Guglielmetti, A.; Gustavino, C.; Gyürky, Gy.; Junker, M.; Lemut, A.; Marta, M.; Mazzocchi, C.; Menegazzo, R.; Mossa, V.; Pantaleo, F.; Prati, P.; Rossi Alvarez, C.; Scott, D. A.; Somorjai, E.; Straniero, O.; Szücs, T.; Takacs, M.

    2017-03-01

    The correct prediction of the abundances of the light nuclides produced during the epoch of Big Bang Nucleosynthesis (BBN) is one of the main topics of modern cosmology. For many of the nuclear reactions that are relevant for this epoch, direct experimental cross section data are available, ushering the so-called "age of precision". The present work addresses an exception to this current status: the 2H(α,γ)6Li reaction that controls 6Li production in the Big Bang. Recent controversial observations of 6Li in metal-poor stars have heightened the interest in understanding primordial 6Li production. If confirmed, these observations would lead to a second cosmological lithium problem, in addition to the well-known 7Li problem. In the present work, the direct experimental cross section data on 2H(α,γ)6Li in the BBN energy range are reported. The measurement has been performed deep underground at the LUNA (Laboratory for Underground Nuclear Astrophysics) 400 kV accelerator in the Laboratori Nazionali del Gran Sasso, Italy. The cross section has been directly measured at the energies of interest for Big Bang Nucleosynthesis for the first time, at Ecm = 80, 93, 120, and 133 keV. Based on the new data, the 2H(α,γ)6Li thermonuclear reaction rate has been derived. Our rate is even lower than previously reported, thus increasing the discrepancy between predicted Big Bang 6Li abundance and the amount of primordial 6Li inferred from observations.

  9. Buffer-gas-assisted polarization spectroscopy of 6Li.

    Science.gov (United States)

    Ohtsubo, Nozomi; Aoki, Takatoshi; Torii, Yoshio

    2012-07-15

    We report on the demonstration of Doppler-free polarization spectroscopy of the D2 line of (6)Li atoms. Counterintuitively, the presence of an Ar buffer gas, in a certain pressure range, causes a drastic enhancement of the polarization rotation signal. The observed dependence of the signal amplitude on the Ar buffer pressure and the pump laser power is reproduced by calculations based on simple rate equations. We performed stable laser frequency locking using a dispersion signal obtained by polarization spectroscopy for laser cooling of (6)Li atoms.

  10. Reaction mechanisms in the 6Li+ 52Cr system

    Directory of Open Access Journals (Sweden)

    Pandey Bhawna

    2015-01-01

    Full Text Available Reactions induced by the weakly bound 6Li projectile interacting with the intermediate mass target 52Cr are investigated. The choice of this particular reaction in our study is because it is proposed as a surrogate reaction [6Li(52Cr, d56Fe*] for the measurement of 55Fe(n,p reaction cross-section, which has been found to be very important in fusion reactor studies. All the conditions which have to be satisfied for using the surrogate method have been checked. The energy of 6Li beam is selected in a way so as to get equivalent neutron energy in the region of 9-14 MeV, which is of primary interest in fusion reactor application. In the present work, statistical model calculations PACE (Projection-Angular-Momentum-Coupled-Evaporation, ALICE and Continuum-Discretized–Coupled-Channel (CDCC: FRESCO have been used to provide information for the 6Li + 52Cr system and the respective contributions of different reaction mechanisms. The present theoretical work is an important step in the direction towards studying the cross-section of the 55Fe(n, p55Mn reaction by surrogate method.

  11. Unusual Threshold Anomaly in the 6Li+208Pb System

    Institute of Scientific and Technical Information of China (English)

    ZHANG Chun-Lei; JIA Hui-Ming; WU Zhen-Dong; XU Xin-Xing; BAI Chun-Lin; ZHANG Huan-Qiao; LIN Cheng-Jian; RUAN Ming; LIU Zu-Hua; YANG Feng; WU Xiu-Kun; ZHOU Ping; AN Guang-Peng

    2006-01-01

    @@ The angular distributions of elastic scattering for the 6Li +208Pb system have been measured at several energies around the Coulomb barrier. The parameters of optical potential are extracted by means of a phenomenological optical model analysis. It is found that the real and imaginal potentials show a pronounced energy dependence.The behaviour of the potential at the nearly especially sub-barrier energies in the 6Li+208Pb system is quite different from the results of some previous reports observed in other systems, such as 19 F +208 Pb and 16 O+208 Pb.This unusual threshold phenomenon indicates that breakup channel is strongly coupled with the elastic channel and has obvious effects on optical potential.

  12. Triple α resonances in the {sup 6}Li + {sup 6}Li → 3α reaction at low energy

    Energy Technology Data Exchange (ETDEWEB)

    Tumino, A., E-mail: tumino@lns.infn.it [Facoltà di Ingegneria e Architettura, Università degli Studi di Enna “Kore”, Enna (Italy); INFN, Laboratori Nazionali del Sud, Catania (Italy); Bonasera, A.; Giuliani, G. [INFN, Laboratori Nazionali del Sud, Catania (Italy); Cyclotron Laboratory, Texas A& M University, College Station, TX (United States); Lattuada, M. [INFN, Laboratori Nazionali del Sud, Catania (Italy); Dipartimento di Fisica e Astronomia, Università di Catania, Catania (Italy); Milin, M. [Faculty of Science, University of Zagreb, Zagreb (Croatia); Pizzone, R.G. [INFN, Laboratori Nazionali del Sud, Catania (Italy); Spitaleri, C. [INFN, Laboratori Nazionali del Sud, Catania (Italy); Dipartimento di Fisica e Astronomia, Università di Catania, Catania (Italy); Tudisco, S. [INFN, Laboratori Nazionali del Sud, Catania (Italy)

    2015-11-12

    The {sup 6}Li + {sup 6}Li → 3α reaction has been measured in a kinematically complete experiment at 3.1 MeV of beam energy. The reaction mainly proceeds via intermediate {sup 8}Be states. The interaction between any two of the three α particles provides events with one, two or three {sup 8}Be interfering levels, with strong enhancement in the α–α coincidence yield. Evidence of three {sup 8}Be levels within the same 3α event suggests that one α particle is exchanged between the other two. This is a condition for Efimov states to occur in nuclei, for which no observation exists yet. The hyperspherical formalism for the low-energy three-body problem has been applied to point out the 3α particle correlation.

  13. Elastic and inelastic scattering of {sup 6}Li + {sup 18}O versus {sup 7}Li + {sup 18}O and {sup 6}Li + {sup 16}O

    Energy Technology Data Exchange (ETDEWEB)

    Rudchik, Adam T., E-mail: rudchik@kinr.kiev.ua [Institute for Nuclear Research, Ukrainian Academy of Sciences, Prospect Nauki 47, 03680 Kyiv (Ukraine); Kliczewski, Stanislaw [H. Niewodniczański Institute of Nuclear Physics, Polish Academy of Sciences, ul. Radzikowskiego 152, PL-31-342 Cracow (Poland); Chercas, Kostyantyn A. [Institute for Nuclear Research, Ukrainian Academy of Sciences, Prospect Nauki 47, 03680 Kyiv (Ukraine); Kemper, Kirby W. [Physics Department, Florida State University, Tallahassee, FL 32306-4350 (United States); Koshchy, Evgeniy I. [Kharkiv National University, pl. Svobody 4, 61077 Kharkiv (Ukraine); Rusek, Krzysztof [National Centre for Nuclear Research, ul. Hoża 69, PL-00-681 Warsaw (Poland); Heavy Ion Laboratory of Warsaw University, ul. L. Pasteura 5A, PL-02-093 Warsaw (Poland); Rudchik, Andryi A.; Mezhevych, Sergyi Yu.; Pirnak, Valeryi M. [Institute for Nuclear Research, Ukrainian Academy of Sciences, Prospect Nauki 47, 03680 Kyiv (Ukraine); Plujko, Volodymyr A. [Taras Shevchenko Kyiv National University, vul. Volodymyrs' ka 64, 01033 Kyiv (Ukraine); Ponkratenko, Oleg A. [Institute for Nuclear Research, Ukrainian Academy of Sciences, Prospect Nauki 47, 03680 Kyiv (Ukraine); Choiński, Jaroslaw [Heavy Ion Laboratory of Warsaw University, ul. L. Pasteura 5A, PL-02-093 Warsaw (Poland); Czech, Bronislaw; Siudak, Regina; Szczurek, Antoni [H. Niewodniczański Institute of Nuclear Physics, Polish Academy of Sciences, ul. Radzikowskiego 152, PL-31-342 Cracow (Poland); Stolarz, Anna [Heavy Ion Laboratory of Warsaw University, ul. L. Pasteura 5A, PL-02-093 Warsaw (Poland); Zelinskyi, Ruslan M. [Institute for Nuclear Research, Ukrainian Academy of Sciences, Prospect Nauki 47, 03680 Kyiv (Ukraine)

    2014-02-15

    Inverse kinematics scattering of {sup 18}O on {sup 6}Li at E{sub lab}({sup 18}O) = 114 MeV was measured to obtain elastic and inelastic scattering cross sections. In this way cross sections for excited states in {sup 6}Li and {sup 18}O were determined. The data were analyzed within the optical model and coupled reaction channel method. The {sup 6}Li + {sup 18}O optical potential as well as the {sup 6}Li and {sup 18}O deformation parameters were deduced. Contributions of different nuclear processes to the {sup 6}Li + {sup 18}O elastic and inelastic scattering were explored. The isotopic differences between the {sup 6,7}Li + {sup 18}O and {sup 6}Li + {sup 16,18}O potential parameters were determined.

  14. Coulomb Breakup of Nucleus 6 Li on Ion 208Pb

    OpenAIRE

    Irgaziev, B. F.; ERGASHBAEV, H. T.

    1998-01-01

    In the framework of the three-body approach the A(a,bc)A Coulomb breakup has been investigated. The three-body Coulomb dynamic is taken into account to derive the expression for the reaction matrix element. The mechanism of the breakup includes the direct process and the excitation of resonance state of the particle a. The calculation of the triple differential cross section of the 208Pb(6Li, a d)208Pb Coulomb dissociation have been performed in the energy region Ea d < 1MeV. Cal...

  15. Photoassociative creation of ultracold heteronuclear 6Li40K* molecules

    CERN Document Server

    Ridinger, Armin; Salez, Thomas; Fernandes, Diogo Rio; Bouloufa, Nadia; Dulieu, Olivier; Salomon, Christophe; Chevy, Frederic

    2011-01-01

    We investigate the formation of weakly bound, electronically excited, heteronuclear 6Li40K* molecules by single-photon photoassociation in a magneto-optical trap. We performed trap loss spectroscopy within a range of 325 GHz below the Li(2S_(1/2))+K(4P_(3/2)) and Li(2S_(1/2))+K(4P_(1/2)) asymptotic states and observed more than 60 resonances, which we identify as rovibrational levels of 7 of 8 attractive long-range molecular potentials. The long-range dispersion coefficients and rotational constants are derived. We find large molecule formation rates of up to ~3.5x10^7s^(-1), which are shown to be comparable to those for homonuclear 40K_2*. Using a theoretical model we infer decay rates to the deeply bound electronic ground-state vibrational level X^1\\Sigma^+(v'=3) of ~5x10^4s^(-1). Our results pave the way for the production of ultracold bosonic ground-state 6Li40K molecules which exhibit a large intrinsic permanent electric dipole moment.

  16. Three-body parameter for Efimov states in 6Li

    Science.gov (United States)

    Huang, Bo; O'Hara, Kenneth M.; Grimm, Rudolf; Hutson, Jeremy M.; Petrov, Dmitry S.

    2014-10-01

    We present a state-of-the-art reanalysis of experimental results on Efimov resonances in the three-fermion system of 6Li. We discuss different definitions of the three-body parameter (3BP) for Efimov states and adopt a definition that excludes effects due to deviations from universal scaling for low-lying states. We develop a finite-temperature model for the case of three distinguishable fermions and apply it to the excited-state Efimov resonance to obtain the most accurate determination to date of the 3BP in an atomic three-body system. Our analysis of ground-state Efimov resonances in the same system yields values for the three-body parameter that are consistent with the excited-state result. Recent work has suggested that the reduced 3BP for atomic systems is a near-universal quantity, almost independent of the particular atom involved. However, the value of the 3BP obtained for 6Li is significantly (˜20 % ) different from that previously obtained from the excited-state resonance in Cs. The difference between these values poses a challenge for theory.

  17. Efimov Physics in a 6Li-133Cs Atomic Mixture

    Science.gov (United States)

    Johansen, Jacob; Feng, Lei; Parker, Colin; Chin, Cheng; Wang, Yujun

    2015-05-01

    We investigate Efimov physics based on three-body recombination in an atomic mixture of 6Li and 133Cs in the vicinity of interspecies Feshbach resonances at 843 and 889 G. This allows us to compare the loss spectra near different resonances and test the universality of Efimov states. Theoretically the Efimov spectrum near 889 G is expected to be similar to that near 843 G, except that the first resonance is absent near the former Feshbach resonance. This is due to the difference in the Cs-Cs scattering length near the two resonances: At 843 G it is negative, whereas at 889 G it is positive. Although it is primarily the Li-Cs interactions that lead to Efimov resonances, the Cs-Cs scattering length is expected to influence the spectrum. This work is supported by NSF and Chicago MRSEC.

  18. Theoretical calculations and analysis for n + 6Li reaction

    Science.gov (United States)

    Tao, Xi; Wang, Jimin; Chen, Guochang; Shen, Qingbiao

    2017-09-01

    R-matrix theory is an important methodology for applications on light, medium and heavy mass nuclides nuclear reaction in the resonance energy range. Full R-matrix formalism contains the diagonal elements of the energy levels matrix and it is a rigorous theory. Because of different assumptions and approximations, many kinds of R-matrix derived methods are obtained. The new R-matrix code FDRR is presented and includes 4 kinds of R-matrix applications. It can be used for calculating integral cross sections and angular distributions of 2-bodies reactions. The cross sections and angular distributions of n+ 6Li reaction are calculated and analyzed by FDRR code. The results are in good agreement with experimental data below 20 MeV.

  19. High-energy break-up of 6Li as a tool to study the Big-Bang nucleosynthesis reaction 2H(alpha,gamma)6Li

    CERN Document Server

    Hammache, F; Typel, S; Galaviz, D; Sümmerer, K; Coc, A; Uhlig, F; Attallah, F; Caamano, M; Cortina, D; Geissel, H; Hellström, M; Iwasa, N; Kiener, J; Koczon, P; Kohlmeyer, B; Mohr, P; Schwab, E; Schwarz, K; Schümann, F; Senger, P; Sorlin, O; Tatischeff, V; Thibaud, J P; Vangioni, E; Wagner, A; Walus, W

    2010-01-01

    The recently claimed observations of non-negligible amounts of 6Li in old halo stars have renewed interest in the Big-Bang Nucleosynthesis (BBN) of 6Li. One important ingredient in the predicted BBN abundance of 6Li is the low-energy 2H(alpha,gamma)6Li cross section. Up to now, the only available experimental result for this cross section showed an almost constant astrophysical S-factor below 400 keV, contrary to theoretical expectations. We report on a new measurement of the 2H(alpha,gamma)6Li reaction using the break-up of 6Li at 150 A MeV. Even though we cannot separate experimentally the Coulomb contribution from the nuclear one, we find clear evidence for Coulomb-nuclear interference by analyzing the scattering-angular distributions. This is in-line with our theoretical description which indicates a drop of the S_24-factor at low energies as predicted also by most other models. Consequently, we find even lower upper limits for the calculated primordial 6Li abundance than before.

  20. THE 2H(alpha, gamma6LI REACTION AT LUNA AND BIG BANG NUCLEOSYNTHETIS

    Directory of Open Access Journals (Sweden)

    Carlo Gustavino

    2013-12-01

    Full Text Available The 2H(α, γ6Li reaction is the leading process for the production of 6Li in standard Big Bang Nucleosynthesis. Recent observations of lithium abundance in metal-poor halo stars suggest that there might be a 6Li plateau, similar to the well-known Spite plateau of 7Li. This calls for a re-investigation of the standard production channel for 6Li. As the 2H(α, γ6Li cross section drops steeply at low energy, it has never before been studied directly at Big Bang energies. For the first time the reaction has been studied directly at Big Bang energies at the LUNA accelerator. The preliminary data and their implications for Big Bang nucleosynthesis and the purported 6Li problem will be shown.

  1. All-optical production of 6Li quantum gases

    Science.gov (United States)

    Burchianti, A.; Seman, J. A.; Valtolina, G.; Morales, A.; Inguscio, M.; Zaccanti, M.; Roati, G.

    2015-03-01

    We report efficient production of quantum gases of 6Li using a sub-Doppler cooling scheme based on the D1 transition. After loading in a standard magneto-optical trap, an atomic sample of 109 atoms is cooled at a temperature of 40 μK by a bichromatic D1 gray-molasses. More than 2×107 atoms are then transferred into a high-intensity optical dipole trap, where a two-spin state mixture is evaporatively cooled down to quantum degeneracy. We observe that D1 cooling remains effective in the deep trapping potential, allowing an effective increase of the atomic phase-space density before starting the evaporation. In a total experimental cycle of 11 s, we produce weakly-interacting degenerate Fermi gases of 7×105 atoms at T/TF molecules. We further describe a simple and compact optical system both for high-resolution imaging and for imprinting a thin optical barrier on the atomic cloud; this represents a first step towards the study of quantum tunneling in strongly interacting superfluid Fermi gases.

  2. 6Li/7Li estimates for metal-poor stars

    CERN Document Server

    Perez, A E Garcia; Inoue, S; Ryan, S G; Suzuki, T K; Chiba, M

    2009-01-01

    The presence of the lithium-6 isotope in some metal-poor stars is a matter of surprise because of the high values observed. Non-standard models of Big Bang nucleosynthesis and pre-Galactic cosmic ray fusion and spallation have been proposed to explain these values. However, the observations of this light isotope are challenging which may make some detections disputable. The goal was to determine 6Li/7Li for a sample of metal-poor stars; three of them have been previously studied and the remaining two are new for this type of study. The purpose was to increase, if possible, the number of lithium-6 detections and to confirm previously published results. Spectra of the resonance doublet line of neutral lithium Li I 670.78nm were taken with the High Dispersion Spectrograph at the Subaru 8.2m-telescope for a sample of five metal-poor stars (-3.12 < [Fe/H] < -2.19). The contribution of lithium-6 to the total observed line profile was estimated from the 1D-LTE analysis of the line asymmetry. Observed asymmetri...

  3. {sup 6}Li foil scintillation sandwich thermal neutron detector

    Energy Technology Data Exchange (ETDEWEB)

    Ianakiev, K.D., E-mail: ianakiev@lanl.gov [Los Alamos National Laboratory, MS E540, Los Alamos, NM 87545 (United States); Swinhoe, M.T.; Favalli, A.; Chung, K.; MacArthur, D.W. [Los Alamos National Laboratory, MS E540, Los Alamos, NM 87545 (United States)

    2011-10-01

    Increasing needs for neutron detection and limited supply of {sup 3}He have led to the need for replacement neutron detection technology. This paper presents the design and initial results for a neutron detector ({sup 6}Li foil scintillator sandwich) that uses lithium metal foil to detect thermal neutrons. The reaction products, primarily triton, deposit most of their energy in thin scintillator films and create light pulses. Gamma rays can deposit only a small amount of energy in the thin films and so produce only very small light pulses. Lithium is preferable to boron in this application because triton escapes from lithium more easily than does the alpha particle from boron, allowing the use of thicker films and hence greater efficiency. In addition, triton has a higher light output in the scintillator than the boron alpha particle. Lithium metal is preferable to a lithium compound, such as lithium fluoride, because the number of tritons that escape from the metal is greater for the same amount of lithium. Monte Carlo simulations show that good efficiency values can be achieved with reasonably sized detectors, values that are greater than that of comparable {sup 3}He systems for portal monitors. In addition, simulations of a neutron coincidence counting concept show high counting efficiency and short die-away time (16 {mu}s), which imply better performance than that of the high-level neutron coincidence counter (HLNCC)-II. Initial experimental measurements on a prototype detector using alpha particles (having similar light output to the expected tritons) show good light collection and transport properties.

  4. Multi-elemental characterization of organic liquid samples by use of a 13 MeV {sup 6}Li{sup 3+} beam

    Energy Technology Data Exchange (ETDEWEB)

    Liendo, J.A., E-mail: jliendo@usb.v [Department of Physics, Simon Bolivar University, PO Box 89000, Caracas 1080-A (Venezuela, Bolivarian Republic of); Bernal, M.A., E-mail: mbernal@usb.v [Department of Physics, Simon Bolivar University, PO Box 89000, Caracas 1080-A (Venezuela, Bolivarian Republic of); Gonzalez, A.C. [Centro de Fisica, Instituto Venezolano de Investigaciones Cientificas, Caracas (Venezuela, Bolivarian Republic of); Caussyn, D.D.; Fletcher, N.R.; Momotyuk, O.A. [Department of Physics, Florida State University, Tallahassee (United States); Muruganathan, R.M. [Department of Chemistry, Florida State University, Tallahassee (United States); Roeder, B.T.; Wiedenhoever, I. [Department of Physics, Florida State University, Tallahassee (United States); Fischer, T. [Department of Chemistry, Florida State University, Tallahassee (United States); Kemper, K.W.; Barber, P. [Department of Physics, Florida State University, Tallahassee (United States); Sajo-Bohus, L. [Department of Physics, Simon Bolivar University, PO Box 89000, Caracas 1080-A (Venezuela, Bolivarian Republic of)

    2009-10-15

    Evaporated amniotic fluid (AF) targets have been bombarded with a 13 MeV {sup 6}Li{sup 3+} beam. Forward angle data have served to identify the {sup 1}H({sup 6}Li,{sup 1}H){sup 6}Li reaction as an alternative for hydrogen characterization of such organic samples. Detected {sup 6}Li ions elastically scattered from C, N, O, Na and Cl can also be used to determine the concentrations of these elements in AF. The analyzed AF samples have been diluted with distilled water. The effect of sample dilution on the improvement of spectrum energy resolution has been observed, confirming previous reports. The hydrogen concentration determined in the studied AF targets is shown to vary linearly with sample dilution. Two detector arrangements have been used to find out which detection scheme is the most convenient. The combination of a counter telescope and a single detector, set up at the same polar angle on the opposite side of the beam, seems to be the best choice to have a reliable particle identification and an adequate energy resolution simultaneously.

  5. Basic technology for 6Li enrichment using an ionic-liquid impregnated organic membrane

    Science.gov (United States)

    Hoshino, Tsuyoshi; Terai, Takayuki

    2011-10-01

    The tritium needed as a fuel for fusion reactors is produced by the neutron capture reaction of lithium-6 ( 6Li) in tritium breeding materials. However, natural Li contains only about 7.6 at.% 6Li. In this paper, a new lithium isotope separation technique using an ionic-liquid impregnated organic membrane is proposed. In order to separate and concentrate lithium isotopes, only lithium ions are able to move through the membrane by electrodialysis between the cathode and the anode in lithium solutions. Preliminary experiments of lithium isotope separation were conducted using this phenomenon. Organic membranes impregnated with TMPA-TFSI and PP13-TFSI as ionic liquids were prepared, and the relationship between the 6Li separation coefficient and the applied electrodialytic conditions was evaluated using them. The results showed that the 6Li isotope separation coefficient in this method (about 1.1-1.4) was larger than that in the mercury amalgam method (about 1.06).

  6. Search for the Halo Effect in the 1H(6He, 6Li)n Peaction

    Institute of Scientific and Technical Information of China (English)

    李志宏; 柳卫平; 白希祥; 王友宝; 连钢; 李志常; 申庆彪; 林承键; 曾晟; 符长波

    2002-01-01

    The angular distributions of the charge exchange reaction 1 H(6He, 6Li)n were measured in reverse kinematics with a secondary 6He beam at the energy of4.17 AMeV. The data were analysed in the context ora microscopic calculation. It is shown that both the ground state of6He and the second excited state of6Li (3.563 MeV, 0+) have a halo structure.

  7. 6LiF oleic acid capped nanoparticles entrapment in siloxanes for thermal neutron detection

    Science.gov (United States)

    Carturan, S.; Maggioni, G.; Marchi, T.; Gramegna, F.; Cinausero, M.; Quaranta, A.; Palma, M. Dalla

    2016-07-01

    The good light output of siloxane based scintillators as displayed under γ-rays and α particles has been exploited here to obtain clear and reliable response toward thermal neutrons. Sensitization towards thermal neutrons has been pursued by adding 6LiF, in form of nanoparticles. Aiming at the enhancement of compatibility between the inorganic nanoparticles and the low polarity, siloxane based surrounding medium, oleic acid-capped 6LiF nanoparticles have been synthesized by thermal decomposition of Li trifluoroacetate. Thin pellets siloxane scintillator maintained their optical transmittance up to weight load of 2% of 6Li. Thin samples with increasing 6Li concentration and thicker ones with fixed 6Li amount have been prepared and tested with several sources (α, γ-rays, moderated neutrons). Light output as high as 80% of EJ212 under α irradiation was measured with thin samples, and negligible changes have been observed as a result of 6LiF addition. In case of thick samples, severe light loss has been observed, as induced by opacity. Nevertheless, thermal neutrons detection has been assessed and the data have been compared with GS20, based on Li glass, taken as a reference material.

  8. Determining the 6Li Doped Side of a Glass Scintillator for Ultra Cold Neutrons

    CERN Document Server

    Jamieson, Blair

    2015-01-01

    Ultracold neutron (UCN) detectors using two visually very similar, to the microscopic level, pieces of optically contacted Cerium doped lithium glasses have been proposed for high rate UCN experiments. The chief difference between the two glass scintillators is that one side is 6Li depleted and the other side Li doped. This note outlines a method to determine which side of the glass stack is doped with 6Li using AmBe and 252Cf neutron sources, and a Si surface barrier detector. The method sees an excess of events around the alpha and triton energies of neutron capture on 6Li when the enriched side is facing the Si surface barrier detector.

  9. Cosmic Ray Production of $^6$Li by Structure Formation Shocks in the Early Galaxy

    CERN Document Server

    Inoue, S; Inoue, Susumu; Suzuki, Takeru Ken

    2003-01-01

    We discuss the production of the element $^6$Li in the early Galaxy by cosmic rays accelerated at structure formation shocks, driven by the hierarchical merging of sub-Galactic halos during Galaxy formation. The salient features of this scenario are discussed and compared with observations of $^6$Li in metal-poor halo stars, including a recent Subaru HDS result on the star HD140283. Some unique predictions of the model are clearly testable by future observations and may also provide important insight into how the Galaxy formed.

  10. Properties of 4He and 6Li with improved chiral EFT interactions

    Directory of Open Access Journals (Sweden)

    Maris P.

    2016-01-01

    Full Text Available We present recent results for 4He and 6Li obtained with improved NN interactions derived from chiral effective field theory up to N4LO. The many-body calculations are performed order-by-order in the chiral expansion. At N3LO and N4LO additional renormalization using the Similarity Renormalization Group is adopted to improve numerical convergence of the many-body calculations. We discuss results for the ground state energies, as well as the magnetic moment and the low-lying spectrum of 6Li.

  11. Properties of 4He and 6Li with improved chiral EFT interactions

    Science.gov (United States)

    Maris, P.; Binder, S.; Calci, A.; Epelbaum, E.; Furnstahl, R. J.; Golak, J.; Hebeler, K.; Kamada, H.; Krebs, H.; Langhammer, J.; Liebig, S.; Meißner, U.-G.; Minossi, D.; Nogga, A.; Potter, H.; Roth, R.; Skibiński, R.; Topolnicki, K.; Vary, J. P.; Witala, H.

    2016-03-01

    We present recent results for 4He and 6Li obtained with improved NN interactions derived from chiral effective field theory up to N4LO. The many-body calculations are performed order-by-order in the chiral expansion. At N3LO and N4LO additional renormalization using the Similarity Renormalization Group is adopted to improve numerical convergence of the many-body calculations. We discuss results for the ground state energies, as well as the magnetic moment and the low-lying spectrum of 6Li.

  12. Resonant, direct, and transfer breakup of 6Li by 112Sn

    Science.gov (United States)

    Chattopadhyay, D.; Santra, S.; Pal, A.; Kundu, A.; Ramachandran, K.; Tripathi, R.; Sarkar, D.; Sodaye, S.; Nayak, B. K.; Saxena, A.; Kailas, S.

    2016-12-01

    Projectile breakup cross sections in the 6Li+112Sn reaction have been measured at two beam energies, 30 and 22 MeV. Cross sections for sequential breakup of 6Li into α +d via its resonant state of 1+ (5.65 MeV) in the continuum have been measured for the first time along with two other dominant resonant states of 3+ (2.18 MeV) and 2+ (4.31 MeV) at Ebeam=30 MeV. However, at 22 MeV, the α +d breakup is found to be only due to direct breakup process. Cross sections measured for sequential breakup via two transfer channels, (6Li,5Li ) and (6Li,8Be ), into α +p and α +α , respectively, and the above α +d breakup channels compared with the results of coupled-channels calculations unravel the reaction mechanisms involving a weakly bound projectile and different processes leading to large inclusive α -particle production.

  13. Hyperfine structure in photoassociative spectra of 6Li2 and 7Li2

    NARCIS (Netherlands)

    Abraham, E.R.I.; McAlexander, W.I.; Stoof, H.T.C.; Hulet, R.G.

    1996-01-01

    We present spectra of hyperfine resolved vibrational levels of the A1Σu+and 1 3Σg+ states of 6Li2 and 7Li2 obtained via photoassociation of colliding ultracold atoms in a magneto-optical trap. A simple first-order perturbation theory analysis accurately accounts for the frequency splittings and rela

  14. Basic technology for {sup 6}Li enrichment using an ionic-liquid impregnated organic membrane

    Energy Technology Data Exchange (ETDEWEB)

    Hoshino, Tsuyoshi, E-mail: hoshino.tsuyoshi@jaea.go.jp [Blanket Irradiation and Analysis Group, Fusion Research and Development Directorate, Japan Atomic Energy Agency, 4002, Narita-cho, Oarai-machi, Higashi Ibaraki-gun, Ibaraki 311-1393 (Japan); Terai, Takayuki [The Institute of Engineering Innovation and Department of Nuclear Engineering and Management School of Engineering, The University of Tokyo, 2-11-16 Yayoi, Bunkyo-ku, Tokyo 113-8656 (Japan)

    2011-10-01

    The tritium needed as a fuel for fusion reactors is produced by the neutron capture reaction of lithium-6 ({sup 6}Li) in tritium breeding materials. However, natural Li contains only about 7.6 at.% {sup 6}Li. In this paper, a new lithium isotope separation technique using an ionic-liquid impregnated organic membrane is proposed. In order to separate and concentrate lithium isotopes, only lithium ions are able to move through the membrane by electrodialysis between the cathode and the anode in lithium solutions. Preliminary experiments of lithium isotope separation were conducted using this phenomenon. Organic membranes impregnated with TMPA-TFSI and PP13-TFSI as ionic liquids were prepared, and the relationship between the {sup 6}Li separation coefficient and the applied electrodialytic conditions was evaluated using them. The results showed that the {sup 6}Li isotope separation coefficient in this method (about 1.1-1.4) was larger than that in the mercury amalgam method (about 1.06).

  15. A quantum degenerate Bose-Fermi mixture of 41K and 6Li

    Science.gov (United States)

    Wu, Yu-Ping; Yao, Xing-Can; Chen, Hao-Ze; Liu, Xiang-Pei; Wang, Xiao-Qiong; Chen, Yu-Ao; Pan, Jian-Wei

    2017-05-01

    We report a new apparatus for the study of two-species quantum degenerate mixture of 41K and 6Li atoms. We develop and combine several advanced cooling techniques to achieve both a large atom number and high phase space density of the two-species atom clouds. Furthermore, we build a high efficiency two-species magnetic transport system to transfer atom clouds from the 3D magneto-optical-trap chamber to a full glass science chamber of an extreme high vacuum environment and good optical access. We perform a forced radio-frequency evaporative cooling for 41K atoms while the 6Li atoms are sympathetically cooled in an optically plugged magnetic trap. Finally, we achieve the simultaneous quantum degeneracy for the 41K and 6Li atoms. The Bose-Einstein condensate of 41K has 1.4 × 105 atoms with a condensate fraction of about 62%, while the degenerate Fermi gas of 6Li has a total atom number of 5.4 × 105 at 0.25 Fermi temperature.

  16. VL51ES (Generation 6 Li-Ion Cell for Satellites

    Directory of Open Access Journals (Sweden)

    Defer M.

    2017-01-01

    Full Text Available This paper presents the design of Saft’s VL51ES (Generation 6 Li-Ion cell, the main challenges in the course of the development, the main BOL characteristics and performances achieved during the development program. Finally, it also describes how this cell fits in Saft’s battery range and the benefits of it.

  17. Gamow shell model description of radiative capture reactions $^6$Li$(p,\\gamma)$$^7$Be and $^6$Li$(n,\\gamma)$$^7$Li

    CERN Document Server

    Dong, G X; Fossez, K; Płoszajczak, M; Jaganathen, Y; Betan, R M Id

    2016-01-01

    According to standard stellar evolution, lithium abundance is believed to be a useful indicator of the stellar age. However, many evolved stars like red giants show huge fluctuations around expected theoretical abundances that are not yet fully understood. The better knowledge of nuclear reactions that contribute to the creation and destruction of lithium can help to solve this puzzle. In this work we apply the Gamow shell model (GSM) formulated in the coupled-channel representation (GSM-CC) to investigate the mirror radiative capture reactions $^6$Li$(p,\\gamma)$$^7$Be and $^6$Li$(n,\\gamma)$$^7$Li. The cross-sections are calculated using a translationally invariant Hamiltonian with the finite-range interaction which is adjusted to reproduce spectra, binding energies and one-nucleon separation energies in $^{6-7}$Li, $^7$Be. All relevant $E1$, $M1$, and $E2$ transitions from the initial continuum states to the final bound states $J={3/2}_1^-$ and $J={1/2}^-$ of $^7$Li and $^7$Be are included. We demonstrate th...

  18. Nuclear reactions of the system {sup 6} Li on {sup 58} Ni near the Coulomb barrier; Reacciones nucleares del sistema {sup 6} Li sobre {sup 58} Ni cerca de la barrera de Coulomb

    Energy Technology Data Exchange (ETDEWEB)

    Lizcano, D.; Aguilera, E.F.; Garcia M, H.; Martinez Q, E. [ININ, 52045 Ocoyoacac, Estado de Mexico (Mexico)

    2004-07-01

    Protons, alpha particles and deuterons coming from the reactions {sup 6} Li + {sup 58} Ni are detected to three different energy around the Coulomb barrier. The possible effects of the weakly bound character of the projectile are studied and the results are compared with previous data for the system {sup 6} Li + {sup 59} Co. (Author)

  19. Importance of $1n$-stripping process in the $^{6}$Li+$^{159}$Tb reaction

    CERN Document Server

    Pradhan, M K; Roy, Subinit; Basu, P; Goswami, A; Kshetri, R; Palit, R; Parkar, V V; Ray, M; Sarkar, M Saha; Santra, S

    2013-01-01

    The inclusive cross sections of the $\\alpha$-particles produced in the reaction $^{6}$Li+$^{159}$Tb have been measured at energies around the Coulomb barrier. The measured cross sections are found to be orders of magnitude larger than the calculated cross sections of $^{6}$Li breaking into $\\alpha$ and $d$ fragments, thus indicating contributions from other processes. The experimental cross sections of $1n$-stripping and $1n$-pickup processes have been determined from an entirely different measurement, reported earlier. Apart from incomplete fusion and/ $d$-transfer processes, the $1n$-stripping process is found to be a significant contributor to the inclusive $\\alpha$-particle cross sections in this reaction.

  20. Narrow-linewidth cooling of $^{6}$Li atoms using the 2S-3P transition

    CERN Document Server

    Chen, Hao-Ze; Wu, Yu-Ping; Liu, Xiang-Pei; Wang, Xiao-Qiong; Chen, Yu-Ao; Pan, Jian-Wei

    2016-01-01

    We report on a narrow-linewidth cooling of $^{6}$Li atoms using the $2S_{1/2}\\to 3P_{3/2}$ transition in the ultraviolet (UV) wavelength regime. By combining the traditional red magneto-optical trap (MOT) at 671 nm and the UV MOT at 323 nm, we obtain a cold sample of $1.3\\times10^9$ atoms with a temperature of 58 $\\mu$K. Furthermore, we demonstrate a high efficiency magnetic transport for $^{6}$Li atoms with the help of the UV MOT. Finally, we obtain $8.1\\times10^8$ atoms with a temperature of 296 $\\mu$K at a magnetic gradient of 198 G/cm in the science chamber with a good vacuum environment and large optical access.

  1. Scintillation properties of semiconducting 6LiInSe2 crystals to ionizing radiation

    Science.gov (United States)

    Wiggins, Brenden; Groza, Michael; Tupitsyn, Eugene; Lukosi, Eric; Stassun, Keivan; Burger, Arnold; Stowe, Ashley

    2015-11-01

    6LiInSe2 has gained attention recently as a semiconducting thermal neutron detector. As presented herein, the chalcogenide compound semiconductor also detects incident neutrons via scintillation, making 6LiInSe2 the only lithium containing semiconductor to respond to neutrons via both detection mechanisms. Both yellow and red crystals, which appear in the literature, were investigated. Only the yellow crystal responded favorably to ionizing radiation, similar to the semiconducting operation utilizing electrodes. The obtained light yield for yellow crystals is 4400 photons/MeV, referenced to Bi4Ge3O12 (BGO).The estimated thermal neutron light yield was 21,000 photons/thermal neutron. The two measured decay time components were found to be 31±1 ns (49%) and 143±9 ns (51%).This crystal provides efficient, robust detection of neutrons via scintillation with respectable light yield and rapid response, enabling its use for a broad array of neutron detection applications.

  2. Optimization of a sup 6 LiF bolometric neutron detector

    CERN Document Server

    Silver, C S; Piccirillo, L; Timbie, P T; Zhou, J W

    2002-01-01

    The optimization of a sup 6 LiF bolometer for neutron spectroscopy applications has been accomplished with a series of 12 different detectors. This type of detector is similar to X-ray bolometers, which have been extensively studied, and the absorber has a high neutron capture cross-section. Each bolometer was irradiated with alpha particles to investigate its response to thermal pulses. The best resolution obtained with this series of bolometers was 39 keV FWHM at 5.3 MeV. One of the bolometers was calibrated with monoenergetic neutrons, and its thermal properties are derived from measurements over a range of temperatures. We discuss the considerations involved in optimizing a sup 6 LiF bolometer for different types of neutron applications.

  3. Autler-Townes splitting in two-color photoassociation of 6Li

    CERN Document Server

    Schloeder, U; Silber, C; Zimmermann, C; Schloeder, Ulrike; Deuschle, Thomas; Silber, Christian; Zimmermann, Claus

    2003-01-01

    We report on high-resolution two-color photoassociation spectroscopy in the triplet system of magneto-optically trapped 6Li. The absolute transition frequencies have been measured. Strong optical coupling of the bound molecular states has been observed as Autler-Townes splitting in the photoassociation signal. The spontaneous bound-bound transition rate is determined and the molecule formation rate is estimated. The observed lineshapes are in good agreement with the theoretical model.

  4. Formation of eta'(958) Meson Bound States by the 6Li(gamma,d) reaction

    CERN Document Server

    Miyatani, M; Nagahiro, H; Hirenzaki, S

    2016-01-01

    We have investigated the 6Li(gamma,d) reaction theoretically for the formation of the eta'(958) mesic nucleus close to the recoilless kinematics. We have developed the theoretical formula and reported the quantitative results of the formation spectra for various cases in this article. We have found that the formation cross sections are reduced by the effects of the fragile deuteron form factor.

  5. Optimization of {sup 6}LiF:ZnS(Ag) Scintillator Light Yield Using Geant4

    Energy Technology Data Exchange (ETDEWEB)

    Yehuda-Zada, Y. [Nuclear Research Center Negev, Beer-Sheva (Israel); Ben-Gurion University (Israel); Pritchard, K.; Ziegler, J.B.; Cooksey, C.; Siebein, K. [National Institute of Standards and Technology, Gaithersburg, Maryland (United States); Jackson, M.; Hurlbut, C. [Eljen Technology, Sweetwater Texas (United States); Kadmon, Y.; Cohen, Y.; Maliszewskyj, N.C. [Nuclear Research Center Negev, Beer-Sheva (Israel); Ibberson, R.M.; Majkrzak, C.F. [National Institute of Standards and Technology, Gaithersburg, Maryland (United States); Orion, Y. [Ben-Gurion University (Israel); Osovizky, A. [National Institute of Standards and Technology, Gaithersburg, Maryland (United States); Rotem Industries Ltd, Rotem Industrial Park (Israel); University of Maryland (United States)

    2015-07-01

    Neutrons provide an effective tool to probe materials structure. Neutron diffraction is a method to determine the atomic and magnetic structure of a material based on neutron scattering. By this method a collimated incident beam of thermal neutrons heat the examined sample and based on the obtained diffraction pattern information on the structure of the material is provided. Research for developing a novel cold neutron detector for Chromatic Analysis Neutron Diffractometer Or Reflectometer (CANDOR) is underway at the NIST center for neutron research. The system unique design is aimed to provide over ten times fold faster analysis of materials than conventional system. In order to achieve the fast analysis a large number of neutron detectors is required. A key design constraint for this detector is the thickness of the neutron sensitive element. This is met using {sup 6}LiF:ZnS(Ag) scintillation material with embedded wavelength shifting (WLS) fibers conducting scintillation light to silicon photomultiplier photo-sensors. The detector sensitivity is determined by both the neutron capture probability ({sup 6}Li density) and the detectable light output produced by the ZnS(Ag) ionization, the latter of which is hindered by the fluorescence absorption of the scintillation light by the ZnS. Tradeoffs between the neutron capture probability, stimulated light production and light attenuation for determining the optimal stoichiometry of the {sup 6}LiF and ZnS(Ag) as well as the volume ratio of scintillator and fiber. Simulations performed using the GEANT4 Monte Carlo package were made in order to optimize the detector design. GEANT4 enables the investigation of the neutron interaction with the detector, the ionization process and the light transfer process following the nuclear process. The series of conversions required for this detector were modelled: - A cold neutron enters the sensor and is captured by {sup 6}Li in the scintillator mixture ({sup 6}Li (n,α) {sup 3}H

  6. {sup 6}Li breakup and suppression of complete fusion above the Coulomb barrier

    Energy Technology Data Exchange (ETDEWEB)

    Elmahdy, N.A. [Modern Academy for Engineering and Technology, Cairo (Egypt); Denikin, A.S. [Dubna International University, Dubna (Russian Federation); JINR, Flerov Laboratory of Nuclear Reactions, Dubna (Russian Federation); Ismail, M.; Ellithi, A.Y. [Cairo University, Cairo (Egypt)

    2015-05-15

    We study the role of the projectile breakup in the fusion process by example of the {sup 6}Li reactions with the {sup 59}Co, {sup 144}Sm and {sup 209}Bi targets in vicinity of the Coulomb barrier. The coupled channel and distorted wave approaches are employed in order to calculate the complete fusion and the breakup cross sections, respectively. The partial cross sections in both the channels are compared in order to estimate the breakup fraction responsible for the suppression of complete fusion. The calculations are compared with available experimental data. The conclusions and recommendations are made. (orig.)

  7. Model Calculation of n + 6Li Reactions Below 20 MeV

    Institute of Scientific and Technical Information of China (English)

    ZHANG Jing-Shang; HAN Yin-Lu

    2001-01-01

    Based on the unified Hauser-Feshbach and exciton model for light nuclei, the calculations of reaction cross sections and the double-differential cross sections for n + 6Li are performed. Since all of the first-particle emissions are from the compound nucleus to the discrete levels, the angular momentum coupling effect in pre-equilibrium mechanism must be taken into account. The fitting of the measured data indicates that the three-body break-up process needs to be involved, and the pre-equilibrium reaction mechanism dominates the reaction processes. In light nucleus reactions the recoil effect must be taken into account.``

  8. Characterization of the silicon+6LiF thermal neutron detection technique

    Science.gov (United States)

    Pappalardo, A.; Barbagallo, M.; Cosentino, L.; Marchetta, C.; Musumarra, A.; Scirè, C.; Scirè, S.; Vecchio, G.; Finocchiaro, P.

    2016-02-01

    The worldwide need to replace 3He for neutron detection has triggered research and development on new technologies and methods. A promising one is based on commercial solid state silicon detectors coupled with thin neutron converter layers containing 6Li. After proving the feasibility of this technique, we characterized the behavior of such a detector with different converter layer thicknesses. In this paper we also disentangle other contributions to the overall spectrum shape observed with this kind of detector, proving that its detection efficiency can be made reasonably high and that the gamma/neutron discrimination capability is comparable to that of 3He tubes.

  9. Characterization of the silicon+6LiF thermal neutron detection technique

    CERN Document Server

    Pappalardo, A; Cosentino, L; Marchetta, C; Musumarra, A; Scirè, C; Scirè, S; Vecchio, G; Finocchiaro, P

    2015-01-01

    The worldwide need to replace 3He for the neutron detection has triggered R&D on new technologies and methods. A promising one is based on commercial solid state silicon detectors coupled with thin neutron converter layers containing 6Li. After proving the feasibility of this technique, we characterized the behavior of such a detector with different converter layer thicknesses. In this paper we also disentangle other contributions to the overall spectrum shape observed with this kind of detector, proving that its detection efficiency can be made reasonably high and that the gamma/neutron discrimination capability is comparable to the one of 3He tubes.

  10. Comparative analysis of pulse shape discrimination methods in a {sup 6}Li loaded plastic scintillator

    Energy Technology Data Exchange (ETDEWEB)

    Balmer, Matthew J.I., E-mail: m.balmer@lancaster.ac.uk [Department of Engineering, Lancaster University, LA1 4YR (United Kingdom); Gamage, Kelum A.A. [Department of Engineering, Lancaster University, LA1 4YR (United Kingdom); Taylor, Graeme C. [Neutron Metrology Group, National Physical Laboratory, Teddington, TW11 0LW (United Kingdom)

    2015-07-11

    Three algorithms for discriminating between fast neutrons, thermal neutrons and gamma rays in a {sup 6}Li loaded plastic scintillator have been compared. Following a literature review of existing pulse shape discrimination techniques, the performance of the charge comparison method, triangular filtering and frequency gradient analysis were investigated in this work. The scintillator was exposed to three different mixed gamma/neutron radiation fields. The figure of merit of neutron/gamma separation was investigated over a broad energy range, as well as for the neutron capture energy region. After optimisation, all three methods were found to perform similarly in terms of neutron/gamma separation.

  11. Study of silicon+6LiF thermal neutron detectors: GEANT4 simulations versus real data

    Science.gov (United States)

    Meo, S. Lo; Cosentino, L.; Mazzone, A.; Bartolomei, P.; Finocchiaro, P.

    2017-09-01

    Research and development on alternative thermal neutron detection technologies and methods are nowadays needed as a possible replacement of 3He-based ones. Commercial solid state silicon detectors, coupled with neutron converter layers containing 6Li, have been proved to represent a viable solution for several applications as present in the literature. In order to better understand the detailed operation and the response and efficiency of such detectors, a series of dedicated GEANT4 simulations were performed and compared with real data collected in a few different configurations. The results show an excellent agreement between data and simulations, indicating that the behavior of the detector is fully understood.

  12. Characterization of the silicon+{sup 6}LiF thermal neutron detection technique

    Energy Technology Data Exchange (ETDEWEB)

    Pappalardo, A. [INFN Laboratori Nazionali del Sud, Catania (Italy); Barbagallo, M. [INFN Sezione di Bari (Italy); Cosentino, L.; Marchetta, C. [INFN Laboratori Nazionali del Sud, Catania (Italy); Musumarra, A. [INFN Laboratori Nazionali del Sud, Catania (Italy); Università di Catania (Italy); Scirè, C.; Scirè, S.; Vecchio, G.; Finocchiaro, P. [INFN Laboratori Nazionali del Sud, Catania (Italy)

    2016-02-21

    The worldwide need to replace {sup 3}He for neutron detection has triggered research and development on new technologies and methods. A promising one is based on commercial solid state silicon detectors coupled with thin neutron converter layers containing {sup 6}Li. After proving the feasibility of this technique, we characterized the behavior of such a detector with different converter layer thicknesses. In this paper we also disentangle other contributions to the overall spectrum shape observed with this kind of detector, proving that its detection efficiency can be made reasonably high and that the gamma/neutron discrimination capability is comparable to that of {sup 3}He tubes.

  13. Astrophysical S factor for the radiative-capture reaction p{sup 6}Li {yields} {sup 7}Be{gamma}

    Energy Technology Data Exchange (ETDEWEB)

    Dubovichenko, S. B., E-mail: sergey@dubovichenko.ru [National Space Agency of the Republic of Kazakhstan, Fessenkov Astrophysical Institute, National Center of Space Research and Technology (Kazakhstan); Burtebaev, N., E-mail: burteb@inp.kz; Zazulin, D. M.; Kerimkulov, Zh. K. [National Nuclear Center of Republic of Kazakhstan, Institute of Nuclear Physics (Kazakhstan); Amar, A. S. A. [Al-Farabi Kazakh National University (Kazakhstan)

    2011-07-15

    A new measurement of differential cross sections for elastic p{sup 6}Li scattering in the energy range 0.35-1.2 MeV was performed. A partial-wave analysis of the data obtained in this way was carried out, and potentials simulating the p{sup 6}Li interaction were constructed. Various experiments devoted to studying elastic p{sup 6}Li scattering over the broad energy range of 0.5-50 MeV were analyzed on the basis of the optical model. By using the potentials obtained from the partial-wave analysis, the possibility of describing the astrophysical S factor for radiative proton capture on {sup 6}Li at low energies was considered within the potential cluster model involving forbidden states.

  14. Pulse-Shape Analysis of Neutron-Induced Scintillation Light in Ni-doped 6LiF/ZnS

    Energy Technology Data Exchange (ETDEWEB)

    Cowles, Christian C.; Behling, Richard S.; Imel, G. R.; Kouzes, Richard T.; Lintereur, Azaree; Robinson, Sean M.; Stave, Sean C.; Siciliano, Edward R.; Wang, Zheming

    2016-10-06

    Abstract–Alternatives to 3He are being investigated for gamma-ray insensitive neutron detection applications, including plutonium assay. One promising material is lithium-6 fluoride with silver activated zinc sulfide 6LiF/ZnS(Ag) in conjunction with a wavelength shifting plastic. Doping the 6LiF/ZnS(Ag) with nickel (Ni) has been proposed as a means of reducing the decay time of neutron signal pulses. This research performed a pulse shape comparison between Ni-doped and non-doped 6LiF/ZnS(Ag) neutron pulses. The Ni-doped 6LiF/ZnS(Ag) had a 32.7% ± 0.3 increase in neutron pulse height and a 32.4% ± 0.3 decrease in neutron pulse time compared to the non-doped 6LiF/ZnS(Ag). Doping 6LiF/ZnS(Ag) with nickel may allow neutron detector operation with improved signal to noise ratios, and reduced pulse pileup affects, increasing the accuracy and range of source activities with which such a detector could operate.

  15. On the nuclear $(n;t)-$reaction in the three-electron ${}^{6}$Li atom

    CERN Document Server

    Frolov, Alexei M

    2012-01-01

    The nuclear $(n;t)-$reaction of the three-electron ${}^{6}$Li atom with thermal/slow neutrons is considered. An effective method has been developed for determining the probabilities of formation of various atoms and ions in different bound states. We discuss a number of fundamental questions directly related to numerical computations of the final state atomic probabilities. A few appropriate variational expansions for atomic wave functions of the incident lithium atom and final helium atom and/or tritium negatively charged ion are discussed. It appears that the final ${}^4$He atom arising during the nuclear $(n,{}^{6}$Li; ${}^4$He$,t)$-reaction in the three-electron Li atom can also be created in its triplet states. The formation of the quasi-stable three-electron $e^{-}_3$ during the nuclear $(n; t)-$reaction at the Li atom is briefly discussed. Bremsstrahlung emitted by atomic electrons accelerated by the rapidly moving fragments from this reaction is analyzed. The frequency spectrum of the emitted radiatio...

  16. Scintillation properties of semiconducting {sup 6}LiInSe{sub 2} crystals to ionizing radiation

    Energy Technology Data Exchange (ETDEWEB)

    Wiggins, Brenden [Y-12 National Security Complex, Oak Ridge, TN (United States); Vanderbilt University, Nashville, TN (United States); Groza, Michael; Tupitsyn, Eugene [Fisk University, Nashville, TN (United States); Lukosi, Eric [University of Tennessee, Knoxville, TN (United States); Stassun, Keivan; Burger, Arnold [Vanderbilt University, Nashville, TN (United States); Fisk University, Nashville, TN (United States); Stowe, Ashley [Y-12 National Security Complex, Oak Ridge, TN (United States); Vanderbilt University, Nashville, TN (United States); University of Tennessee, Knoxville, TN (United States)

    2015-11-21

    {sup 6}LiInSe{sub 2} has gained attention recently as a semiconducting thermal neutron detector. As presented herein, the chalcogenide compound semiconductor also detects incident neutrons via scintillation, making {sup 6}LiInSe{sub 2} the only lithium containing semiconductor to respond to neutrons via both detection mechanisms. Both yellow and red crystals, which appear in the literature, were investigated. Only the yellow crystal responded favorably to ionizing radiation, similar to the semiconducting operation utilizing electrodes. The obtained light yield for yellow crystals is 4400 photons/MeV, referenced to Bi{sub 4}Ge{sub 3}O{sub 12} (BGO).The estimated thermal neutron light yield was 21,000 photons/thermal neutron. The two measured decay time components were found to be 31±1 ns (49%) and 143±9 ns (51%).This crystal provides efficient, robust detection of neutrons via scintillation with respectable light yield and rapid response, enabling its use for a broad array of neutron detection applications.

  17. Optimizing ZnS/6LiF scintillators for wavelength-shifting-fiber neutron detectors

    Energy Technology Data Exchange (ETDEWEB)

    Crow, Lowell [ORNL; Funk, Loren L [ORNL; Hannan, Bruce W [ORNL; Hodges, Jason P [ORNL; Riedel, Richard A [ORNL; Wang, Cai-Lin [ORNL

    2016-01-01

    In this paper we compare the performance of grooved and flat ZnS/6LiF scintillators in a wavelength shifting-fiber (WLSF) detector. Flat ZnS/6LiF scintillators with the thickness L=0.2-0.8 mm were characterized using photon counting and pulse-height analysis and compared to a grooved scintillator of approximately 0.8 mm thick. While a grooved scintillator considerably increases the apparent thickness of the scintillator to neutrons for a given coating thickness, we find that the flat scintillators perform better than the grooved scintillators in terms of both light yield and neutron detection efficiency. The flat 0.8-mm-thick scintillator has the highest light output, and it is 52% higher compared with a grooved scintillator of same thickness. The lower light output of the grooved scintillator as compared to the flat scintillator is consistent with the greater scintillator-WLSF separation and the much larger average emission angle of the grooved scintillator. We also find that the average light cone width, or photon travel-length as measured using time-of-flight powder diffraction of diamond and vanadium, decreases with increasing L in the range of L=0.6-0.8 mm. This result contrasts with the traditional Swank diffusion model for micro-composite scintillators, and could be explained by a decrease in photon diffusion-coefficient or an increase in micro-particle content in the flat scintillator matrix for the thicker scintillators.

  18. Line shift, line asymmetry, and the 6Li/7Li isotopic ratio determination

    CERN Document Server

    Cayrel, Roger; Chand, Hum; Bonifacio, Piercarlo; Spite, Monique; Spite, François; Petitjean, Patrick; Ludwig, Hans-Günter; Caffau, Elisabetta

    2007-01-01

    Context: Line asymmetries are generated by convective Doppler shifts in stellar atmospheres, especially in metal-poor stars, where convective motions penetrate to higher atmospheric levels. Such asymmetries are usually neglected in abundance analyses. The determination of the 6Li/7Li isotopic ratio is prone to suffering from such asymmetries, as the contribution of 6Li is a slight blending reinforcement of the red wing of each component of the corresponding 7Li line, with respect to its blue wing. Aims: The present paper studies the halo star HD 74000 and estimates the impact of convection-related asymmetries on the Li isotopic ratio determination. Method: Two methods are used to meet this aim. The first, which is purely empirical, consists in deriving a template profile from another element that can be assumed to originate in the same stellar atmospheric layers as Li I, producing absorption lines of approximately the same equivalent width as individual components of the 7Li I resonance line. The second metho...

  19. Two-proton pickup studies with the (6Li,8B) reaction

    Energy Technology Data Exchange (ETDEWEB)

    Weisenmiller, R.B.

    1976-12-03

    The (/sup 6/Li,/sup 8/B) reaction has been investigated on targets of /sup 26/Mg, /sup 24/Mg, /sup 16/O, /sup 13/C, /sup 12/C, /sup 11/B, /sup 10/B, and /sup 9/Be at a bombarding energy of 80.0 MeV, and on targets of /sup 16/O, /sup 12/C, /sup 9/Be, /sup 7/Li, and /sup 6/Li at a bombarding energy of 93.3 MeV. Only levels consistent with direct, single-step two-proton pickup reaction mechanisms were observed to be strongly populated. On T/sub z/ = 0 targets, the spectroscopic selectivity of this reaction resembles that of the analogous (p,t) reaction. Additionally, these data demonstrate the dominance of spatially symmetric transfer of the two protons. On T/sub z/ greater than 0 targets the (/sup 6/Li,/sup 8/B) reaction was employed to locate two previously unreported levels (at 7.47 +- 0.05 MeV and 8.86 +- 0.07 MeV) in the T/sub z/ = 2 nuclide /sup 24/Ne and to establish the low-lying 1p-shell states in the T/sub z/ = /sup 3///sub 2/ nuclei /sup 11/Be, /sup 9/Li, and /sup 7/He. However, no evidence was seen for any narrow levels in the T/sub z/ = /sup 3///sub 2/ nuclide /sup 5/H nor for any narrow excited states in /sup 7/He. The angular distributions reported here are rather featureless and decrease monotonically with increasing angle. This behavior can be shown by a semi-classical reaction theory to be a consequence of the reaction kinematics. A semi-classical approach also suggests that the kinematic term in the transition matrix element is only weakly dependent upon the angular momentum transfer (which is consistent with simple Distorted Wave Born Approximation calculations). However, only qualitative agreement was obtained between the observed relative transition yields and semi-classical predictions, using the two-nucleon coefficients of fractional parentage of Cohen and Kurath, probably due to the limitations of the semi-classical reaction theory.

  20. Fusion excitation function measurement for 6Li+64Ni at near-barrier energies

    Directory of Open Access Journals (Sweden)

    Shaikh Md. Moin

    2015-01-01

    Full Text Available Total fusion excitation function has been measured for the reaction of weakly bound 6Li projectile on medium mass 64Ni target at energies near the Coulomb barrier of the system. Online characteristic γ-ray detection method has been used to identify and determine the cross sections of the residues. No suppression of total fusion cross section (σTF is observed at above barrier energies. But enhancement of measured cross section with respect to the one-dimensional barrier penetration model (1-DBPM calculation is observed at below barrier energies. The enhancement can not be explained by coupled channels calculation with dominant projectile and target excitations as well as one-neutron stripping reaction.

  1. MeV Neutron Production from Thermal Neutron Capture in {6}^Li Simulated with Geant4

    CERN Document Server

    Santoro, Valentina; Bentley, Phillip M

    2015-01-01

    Various Li compounds are commonly used at neutron facilities as neutron absorbers. These compounds provide one of the highest ratios of neutron attenuation to $\\gamma$-ray production. Unfortunately, the usage of these compounds can also give rise to fast neutron emission with energies up to almost 16 MeV. Historically, some details in this fast neutron production mechanism can be absent from some modeling packages under some optimization scenarios. In this work, we tested Geant4 to assess the performance of this simulation toolkit for the fast neutron generation mechanism. We compare the results of simulations performed with Geant4 to available measurements. The outcome of our study shows that results of the Geant4 simulations are in good agreement with the available measurements for $^6$Li fast neutron production, and suitable for neutron instrument background evaluation at spallation neutron sources.

  2. Reaction mechanisms in the {sup 6}Li + {sup 59}Co system

    Energy Technology Data Exchange (ETDEWEB)

    Souza, F.A. [Instituto de Fisica - Universidade de Sao Paulo, Departamento de Fisica Nuclear, C.P. 66318, 05315-970 Sao Paulo, SP (Brazil)], E-mail: fsouza@dfn.if.usp.br; Beck, C. [Institut Pluridisciplinaire Hubert Curien, UMR 7178, CNRS-IN2P3 et Universite Louis Pasteur, Boite Postale 28, F-67037 Strasbourg, Cedex 2 (France); Carlin, N. [Instituto de Fisica - Universidade de Sao Paulo, Departamento de Fisica Nuclear, C.P. 66318, 05315-970 Sao Paulo, SP (Brazil); Keeley, N. [CEA-Saclay DSM/IRFU/SPhN, F-91191 Gif sur Yvette Cedex (France); Neto, R. Liguori; Moura, M.M. de; Munhoz, M.G.; Del Santo, M.G.; Suaide, A.A.P.; Szanto, E.M.; Szanto de Toledo, A. [Instituto de Fisica - Universidade de Sao Paulo, Departamento de Fisica Nuclear, C.P. 66318, 05315-970 Sao Paulo, SP (Brazil)

    2009-04-15

    The reactions induced by the weakly bound {sup 6}Li projectile interacting with the intermediate mass target {sup 59}Co were investigated. Light charged particles singles and {alpha}-d coincidence measurements were performed at the near barrier energies E{sub lab}=17.4, 21.5, 25.5 and 29.6 MeV. The main contributions of the different competing mechanisms are discussed. A statistical model analysis, Continuum-Discretized Coupled-Channels (CDCC) calculations and two-body kinematics were used as tools to provide information to disentangle the main components of these mechanisms. A significant contribution of the direct breakup was observed through the difference between the experimental sequential breakup cross section and the CDCC prediction for the non-capture breakup cross section.

  3. alpha. - d resonances and the low-lying states of sup 6 Li

    Energy Technology Data Exchange (ETDEWEB)

    Eskandarian, A.; Afnan, I.R. (School of Physical Sciences, The Flinders University of South Australia, Bedford Park, South Australia 5042 (Australia))

    1992-12-01

    The low-lying states (below the {sup 3}He-{sup 3}H threshold) of the {sup 6}Li nucleus are generated using three-body models with two-body nonlocal separable interactions between the constituent particles. The positions and widths of the states are determined by searching for the eigenvalues of the kernel of the Faddeev equations in the complex energy plane. When appropriate (for {ital T}=0 states only), the results are compared with a separate determination of these quantities from the {alpha}-{ital d} scattering process. All experimentally observed levels are found. Given that the Coulomb interaction is not included in our calculations, agreement with experiment is favorable for both the positions and the widths of the resonances.

  4. α-d resonances and the low-lying states of 6Li

    Science.gov (United States)

    Eskandarian, A.; Afnan, I. R.

    1992-12-01

    The low-lying states (below the 3-3H threshold) of the 6Li nucleus are generated using three-body models with two-body nonlocal separable interactions between the constituent particles. The positions and widths of the states are determined by searching for the eigenvalues of the kernel of the Faddeev equations in the complex energy plane. When appropriate (for T=0 states only), the results are compared with a separate determination of these quantities from the α-d scattering process. All experimentally observed levels are found. Given that the Coulomb interaction is not included in our calculations, agreement with experiment is favorable for both the positions and the widths of the resonances.

  5. Time-of-flight calibration of a 6Li glass epithermal neutron detector

    Science.gov (United States)

    Livingston; Saleh; Block; Brand

    2000-10-01

    The curing of Portland cement concrete involves the conversion of water from a free to a bound state. The process can be monitored nondestructively by measuring the shift in the neutron energy spectrum in the epithermal range (0.025-1 eV). A tuned array of 6Li glass detectors has been constructed with varying efficiencies over the epithermal energy range. To determine the efficiency of each detector as a function of neutron energy, it is necessary to calibrate it against a reference neutron spectrum. This was accomplished using a time-of-flight approach with a pulsed neutron beam produced at the Gaerttner LINAC Laboratory at Rensselaer Polytechnic Institute. With a neutron flight path of 25 m it was possible to determine the neutron detector efficiencies to an energy resolution of 11 microeV. The data showed good agreement with the detector design calculations.

  6. Thermal neutron detection by entrapping 6LiF nanocrystals in siloxane scintillators

    Science.gov (United States)

    Carturan, S. M.; Marchi, T.; Maggioni, G.; Gramegna, F.; Degerlier, M.; Cinausero, M.; Dalla Palma, M.; Quaranta, A.

    2015-06-01

    Exploiting the long experience in design and production of scintillating mixtures based on siloxane matrices with combinations of primary dye and waveshifter, a first set of 6LiF loaded scintillator disks has been produced. The synthesis is herein described and reported, as well as preliminary results on their light response towards thermal neutrons. The preservation of transparency and mechanical integrity of the scintillator material is challenging when introducing the inorganic salt LiF which is a "foreign body" to the organic polysiloxane host matrix Different strategies such as synthesis of nanoparticles and surface functionalization have been pursued to succeed in the entrapment of the neutron converter whilst maintaining moderate light output, optical transparency and flexibility of the base scintillator.

  7. MeV Neutron Production from Thermal Neutron Capture in 6Li Simulated With Geant4

    Science.gov (United States)

    Santoro, Valentina; DiJulio, Douglas D.; Bentley, Phillip M.

    2016-09-01

    Various Li compounds are commonly used at neutron facilities as neutron absorbers. These compounds provide one of the highest ratios of neutron attenuation to y- ray production. Unfortunately, the usage of these compounds can also give rise to fast neutron emission with energies up to almost 16 MeV. Historically, some details in this fast neutron production mechanism can be absent from some modeling packages under some optimization scenarios. In this work, we tested Geant4 to assess the performance of this simulation toolkit for the fast neutron generation mechanism. We compare the results of simulations performed with Geant4 to available measurements. The outcome of our study shows that results of the Geant4 simulations are in good agreement with the available measurements for 6 Li fast neutron production, and suitable for neutron instrument background evaluation at spallation neutron sources.

  8. Observation of repulsive Fermi polarons in a resonant mixture of ultracold ${}^6$Li atoms

    CERN Document Server

    Scazza, F; Massignan, P; Recati, A; Amico, A; Burchianti, A; Fort, C; Inguscio, M; Zaccanti, M; Roati, G

    2016-01-01

    We employ radio-frequency spectroscopy to investigate a polarized spin-mixture of ultracold ${}^6$Li atoms close to a broad Feshbach scattering resonance. Focusing on the regime of strong repulsive interactions, we observe well-defined coherent quasiparticles even for unitarity-limited interactions. We characterize the many-body system by extracting the key properties of repulsive Fermi polarons: the energy $E_+$, the effective mass $m^*$, the residue $Z$ and the decay rate $\\Gamma$. Above a critical interaction, $E_+$ is found to exceed the Fermi energy of the bath while $m^*$ diverges and even turns negative. Such findings reveal that the paramagnetic Fermi liquid state becomes thermodynamically unstable towards an energetically favored ferromagnetic phase.

  9. Investigation of α-cluster states in 13C via the (6Li,d) reaction

    CERN Document Server

    Rodrigues, M R D; Horodynski-Matsushigue, L B; Cunsolo, A; Cappuzzello, F; Duarte, J L M; Rodrigues, C L; Ukita, G M; Souza, M A; Miyake, H

    2010-01-01

    The 9Be(6Li,d)13C reaction was used to investigate possible α-cluster states in 13C. The reaction was measured at 25.5 MeV incident energy, employing the São Paulo Pelletron-Enge-Spectrograph facility and the nuclear emulsion detection technique. Ten out of sixteen known levels of 13C, up to 11 MeV of excitation, were observed and, due to the much improved energy resolution of 50 keV, at least three doublets could be resolved. This work presents a preliminary analysis of five of the most intensely populated states, also in comparison with the results of former transfer studies.

  10. Alpha cluster states in light nuclei populated through the (6Li,d) reaction

    Energy Technology Data Exchange (ETDEWEB)

    Borello-Lewin, Thereza; Rodrigues, M.R.D.; Horodynski-Matsushigue, L.B.; Duarte, J.L.M.; Rodrigues, C.L.; Souza, M.A. [Universidade de Sao Paulo (IF/USP), SP (Brazil). Inst. de Fisica; Cunsolo, A.; Cappuzzello, F. [Universita di Catania (Italy). Istituto Nazionale di Fisica Nucleare. Lab. Nazionali del Sud; Ukita, Gilberto Mitsuo [Universidade de Santo Amaro (UNISA), Sao Paulo, SP (Brazil). Fac. de Psicologia

    2011-07-01

    Full text: The alpha cluster correlation is an important concept in the nuclear physics of light nuclei. The main purpose of the research program in progress is the investigation of the alpha clustering phenomenon in (x{alpha}) and(x{alpha}+{nu}) nuclei through the ({sup 6}Li,d) alpha transfer reaction. In fact, there is scarce experimental information on the subject, in particular associated with resonant states predicted near (x{alpha}) and (x{alpha}+{nu}) thresholds. Measurements of the {sup 12},{sup 13}C({sup 6}Li,d) {sup 16},{sup 17}O reactions, at an incident energy of 25.5 MeV, have been performed employing the Sao Paulo Pelletron-Enge Split-Pole facility and the nuclear emulsion detection technique. The work is under way and an experimental energy resolution of 30 keV was obtained. Near the (4{alpha}) breakup threshold in {sup 16}O, three narrow alpha resonances, not previously measured, were detected, revealing important {alpha} + {sup 12}C(G.S.) components. One of these resonances corresponds to the known 0{sup +} state at 15.1 MeV[5] of excitation that has probably, according to Funaki et al., the gas like configuration of the 4{alpha} condensate state, with a very dilute density and a large component of {alpha} + {sup 12}C(Hoyle) configuration. As was already mentioned, our experimental information points to the necessity of including the {alpha} + {sup 12}C(G.S.) component in the wave function. (author)

  11. Fast neutron measurements with 7Li and 6Li enriched CLYC scintillators

    Science.gov (United States)

    Giaz, A.; Blasi, N.; Boiano, C.; Brambilla, S.; Camera, F.; Cattadori, C.; Ceruti, S.; Gramegna, F.; Marchi, T.; Mattei, I.; Mentana, A.; Million, B.; Pellegri, L.; Rebai, M.; Riboldi, S.; Salamida, F.; Tardocchi, M.

    2016-07-01

    The recently developed Cs2LiYCl6:Ce (CLYC) crystals are interesting scintillation detectors not only for their gamma energy resolution (<5% at 662 keV) but also for their capability to identify and measure the energy of both gamma rays and fast/thermal neutrons. The thermal neutrons were detected by the 6Li(n,α)t reaction while for the fast neutrons the 35Cl(n,p)35S and 35Cl(n,α)32P neutron-capture reactions were exploited. The energy of the outgoing proton or α particle scales linearly with the incident neutron energy. The kinetic energy of the fast neutrons can be measured using both the Time Of Flight (TOF) technique and using the CLYC energy signal. In this work, the response to monochromatic fast neutrons (1.9-3.8 MeV) of two CLYC 1″×1″ crystals was measured using both the TOF and the energy signal. The observables were combined to identify fast neutrons, to subtract the thermal neutron background and to identify different fast neutron-capture reactions on 35Cl, in other words to understand if the detected particle is an α or a proton. We performed a dedicated measurement at the CN accelerator facility of the INFN Legnaro National Laboratories (Italy), where the fast neutrons were produced by impinging a proton beam (4.5, 5.0 and 5.5 MeV) on a 7LiF target. We tested a CLYC detector 6Li-enriched at about 95%, which is ideal for thermal neutron measurements, in parallel with another CLYC detector 7Li-enriched at more than 99%, which is suitable for fast neutron measurements.

  12. Fast neutron measurements with {sup 7}Li and {sup 6}Li enriched CLYC scintillators

    Energy Technology Data Exchange (ETDEWEB)

    Giaz, A., E-mail: agnese.giaz@mi.infn.it [INFN Milano, Via Celoria 16, 20133 Milano (Italy); Blasi, N.; Boiano, C.; Brambilla, S. [INFN Milano, Via Celoria 16, 20133 Milano (Italy); Camera, F. [INFN Milano, Via Celoria 16, 20133 Milano (Italy); Università degli Studi di Milano, Physics Department, Via Celoria 16, 20133 Milano (Italy); Cattadori, C. [INFN sezione di Milano Bicocca, Piazza della Scienza 3, 20125 Milano (Italy); Ceruti, S. [INFN Milano, Via Celoria 16, 20133 Milano (Italy); Università degli Studi di Milano, Physics Department, Via Celoria 16, 20133 Milano (Italy); Gramegna, F.; Marchi, T. [INFN Laboratori Nazionali di Legnaro, Viale dell’Università, 2, 35020 Legnaro, PD (Italy); Mattei, I. [INFN Milano, Via Celoria 16, 20133 Milano (Italy); Mentana, A. [INFN Milano, Via Celoria 16, 20133 Milano (Italy); Università degli Studi di Milano, Physics Department, Via Celoria 16, 20133 Milano (Italy); Million, B.; Pellegri, L. [INFN Milano, Via Celoria 16, 20133 Milano (Italy); Rebai, M. [Università degli Studi di Milano Bicocca, Physics Department, Piazza della Scienza 3, 20126 Milano (Italy); Riboldi, S. [INFN Milano, Via Celoria 16, 20133 Milano (Italy); Università degli Studi di Milano, Physics Department, Via Celoria 16, 20133 Milano (Italy); Salamida, F. [INFN sezione di Milano Bicocca, Piazza della Scienza 3, 20125 Milano (Italy); Tardocchi, M. [Istituto di Fisica del Plasma, Associazione EURATOM-ENEA-CNR, Via R. Cozzi 53, 2015 Milano (Italy)

    2016-07-21

    The recently developed Cs{sub 2}LiYCl{sub 6}:Ce (CLYC) crystals are interesting scintillation detectors not only for their gamma energy resolution (<5% at 662 keV) but also for their capability to identify and measure the energy of both gamma rays and fast/thermal neutrons. The thermal neutrons were detected by the {sup 6}Li(n,α)t reaction while for the fast neutrons the {sup 35}Cl(n,p){sup 35}S and {sup 35}Cl(n,α){sup 32}P neutron-capture reactions were exploited. The energy of the outgoing proton or α particle scales linearly with the incident neutron energy. The kinetic energy of the fast neutrons can be measured using both the Time Of Flight (TOF) technique and using the CLYC energy signal. In this work, the response to monochromatic fast neutrons (1.9–3.8 MeV) of two CLYC 1″×1″ crystals was measured using both the TOF and the energy signal. The observables were combined to identify fast neutrons, to subtract the thermal neutron background and to identify different fast neutron-capture reactions on {sup 35}Cl, in other words to understand if the detected particle is an α or a proton. We performed a dedicated measurement at the CN accelerator facility of the INFN Legnaro National Laboratories (Italy), where the fast neutrons were produced by impinging a proton beam (4.5, 5.0 and 5.5 MeV) on a {sup 7}LiF target. We tested a CLYC detector {sup 6}Li-enriched at about 95%, which is ideal for thermal neutron measurements, in parallel with another CLYC detector {sup 7}Li-enriched at more than 99%, which is suitable for fast neutron measurements.

  13. The Astrophysical S-factor for the 2H(, )6Li Nuclear Reaction at Low-Energies

    Indian Academy of Sciences (India)

    H. Sadeghi; A. Moghadasi; M. Ghamary

    2014-12-01

    The alpha radiative capture reactions are the key to understand about primordial nucleosynthesis and the observed abundance of light nucleus in stars. The astrophysical S-factor for the process 2H(, )6Li has been calculated at the low-energies relevant to big-bang nucleosynthesis and in comparison with laboratory data. On the basis of the model, the alpha radiative capture process is studied by using the two-and three-body electromagnetic currents. The bound and resonance states of 6Li are calculated via an inverse process, deuteron- photodisintegration of a 6Li nucleus. In comparison with other theoretical approaches and available laboratory data, excellent agreement is achieved for the astrophysical S-factor of this process.

  14. Photoassociation spectroscopy of long-range molecular states below the 2s + 3p 6Li2 asymptote

    Science.gov (United States)

    Gross, Christian; Chaudhuri, Saptarishi; Gan, Jaren; Dieckmann, Kai

    2015-05-01

    We present photoassociation spectra of high-lying vibrational states of the interatomic potentials correlating to the 2s + 3p asymptote of 6Li2 . Starting from an atomic cloud in a magneto-optical trap we first drive a free-to-bound transition into a molecular bound state using a tunable ultra-violet laser. Thereafter we ionize these long-range molecules using a 532 nm laser and detect the resulting ions with a channeltron. We determine the absolute positions of the transitions with MHz precision utilizing a frequency comb based calibration. Lithium dimers are extensively studied theoretically using various models and methods. Spectroscopic measurements are crucial to test and benchmark these methods and are available for various electronic states and inter-nuclear distances of 6Li2 molecule. Our study provides the first experimental observation of long-range states of the 2s + 3p asymptote of 6Li2 .

  15. Tritium production in a sphere of /sup 6/LiD irradiated by 14-MeV neutrons

    Energy Technology Data Exchange (ETDEWEB)

    Hemmendinger, A.; Ragan, C.E.; Shunk, E.R.; Ellis, A.N.; Anaya, J.M.; Wallace, J.M.

    1978-10-01

    The specific production of tritium in samples of /sup 6/LiH and /sup 7/LiH embedded in a 600-mm-diam sphere of /sup 6/LiD irradiated by a central source of 14-MeV neutrons was determined by measuring the activity of the hydrogen evolved from the samples of each isotope at each of five different radii in the /sup 6/LiD assembly. The entire process of decomposing the LiH, transferring the evolved gas into counters, and determining the decay rate was standardized by processing LiH samples irradiated by thermal neutrons for which the /sup 6/Li(n,..cap alpha..) cross section is well known. The specific production of tritium in /sup 6/LiH and /sup 7/LiH (embedded samples) and the activation of radiochemical detector foils of /sup 45/Sc, /sup 89/Y, /sup 90/Zr, /sup 169/Tm, /sup 191/Ir /sub 373/, /sup 193/Ir /sub 627/, /sup 197/Au, /sup 235/U, and /sup 238/U placed at various positions in the /sup 6/LiD sphere were calculated and compared with the experimental data. One- and three-dimensional Monte Carlo and S/sub n/ neutron-transport calculations were performed. The most reliable (three-dimensional Monte Carlo) calculation is in reasonable agreement with both the tritium-production and the radiochemical-activation data. The existing discrepancies between calculation and experiment appear largely attributable to uncertainties in some tritium-production and radiochemical-activation cross sections. 15 references.

  16. An atomic beam of 6Li — 7Li for high resolution spectroscopy from matrix isolation sublimation

    Science.gov (United States)

    Oliveira, A. N.; Sacramento, R. L.; Silva, B. A.; Uhlmann, F. O.; Wolff, W.; Cesar, C. L.

    2016-07-01

    We propose the Matrix Isolation Sublimation (MlSu) technique for generating cold lithium atoms for the measurement of the 6Li - 7Li isotope shift in D1 and D2 transitions. The technique is capable of generating cold 6Li and 7Li beams at 4 K with forward velocity of 125 m/s. Using this beam we offer a distinguished source of lithium atoms for transitions measurements, adding a new possibility to make high resolution spectroscopy towards improving the experimental checks of the theory.

  17. Projectile-breakup-induced fission-fragment angular distributions in the 6Li+232Th reaction

    Science.gov (United States)

    Pal, A.; Santra, S.; Chattopadhyay, D.; Kundu, A.; Ramachandran, K.; Tripathi, R.; Roy, B. J.; Nag, T. N.; Sawant, Y.; Sarkar, D.; Nayak, B. K.; Saxena, A.; Kailas, S.

    2017-08-01

    Background: Experimental anisotropy in fission-fragment (FF) angular distribution in reactions involving weakly bound stable projectiles with actinide targets are enhanced compared to statistical saddle-point model (SSPM) predictions. Contributions from breakup- or transfer-induced fission to total fission are cited as possible reasons for such enhancement. Purpose: To identify the breakup- or transfer-induced fission channels in 6Li+232Th reaction and to investigate their effects on FF angular anisotropy. Methods: The FF angular distributions have been measured exclusively at three beam energies (28, 32, and 36 MeV) around the Coulomb barrier in coincidence with projectile breakup fragments like α , d , and p using Si strip detectors. The angular anisotropy obtained for different exclusive breakup- or transfer-induced fission channels are compared with that for total fission. SSPM and pre-equilibrium fission models have been employed to obtain theoretical FF angular anisotropy. Results: Angular anisotropy of the fission fragments produced by different transfer- or breakup-induced fission reactions have been obtained separately in the rest frame of respective recoiling nuclei. Some of these anisotropies were found to be stronger than those of the inclusive fission. Overall angular distributions of transfer or breakup fission, integrated over all possible recoil angles with weight factor proportional to differential cross section of the complementary breakup fragment emitted in coincidence in all possible directions, were obtained. It was observed that the overall FF angular anisotropy for each of these fission channels is less than or equal to the anisotropy of total fission at all the measured energies. Assuming isotropic out-of-plane correlations between the fission fragments and light-charged particles, the overall breakup- or transfer-induced fission fragment angular distributions do not explain the observed enhancement in FF anisotropy of total fission. Pre

  18. 6LiF Semiconductor Sandwich Spectrometer for Fast Neutron Spectrum Measurement%用于快中子能谱测量的6LiF夹心半导体谱仪

    Institute of Scientific and Technical Information of China (English)

    蒋勇; 李俊杰; 张涛; 范晓强; 郑春

    2012-01-01

    A detector of 6LiF semiconductor sandwich spectrometer was designed and manufactured. Characteristics of the spectrometer were tested in the fast neutron critical assembly. Measurement principle, configuration of detector and electronic circuit were introduced. Fast neutron spectrum was measured using the 6LiF semiconductor sandwich spectrometer. When the detector's 6 LiF mass thickness is 186 μg/cm2, the spectrometer's energy resolution is 363 keV in the thermal neutron field. For this spectrometer, the optimal fathomable neutron energy range is 0. 3-7. 5 MeV, and the background counts only take possession of 1 % in this area.%本文介绍了6 LiF夹心谱仪的测量原理、自行设计研制的6LiF夹心半导体谱仪探头结构及电子学系统组成等.在热中子场中测试了夹心谱仪的性能,获得了α粒子峰、T粒子峰及“和”峰在多道上的位置与能量分辨率,并用T粒子与“和”峰两个能量点的峰位对谱仪系统进行了能量刻度.分别用效应探头和本底探头测量了临界装置表面的效应谱和本底谱,当效应探头采用的6 LiF镀层质量厚度为186 μg/cm2时,6 LiF夹心谱仪对热中子的能量分辨率为363 keY,测量中子最佳能区为0.3~7.5 MeV,在该能区内,本底谱约占1%.

  19. Development of a 6LiF/ZnS-based Neutron Multiplicity Counter

    Energy Technology Data Exchange (ETDEWEB)

    Stave, Sean C.; Behling, Richard S.; Bernacki, Bruce E.; Bliss, Mary; Cowles, Christian C.; Kouzes, Richard T.; Lintereur, Azaree; Robinson, Sean M.; Siciliano, Edward R.

    2016-10-06

    Abstract–Neutron multiplicity counters are used in safeguards to provide rapid assay of samples which contain an unknown amount of plutonium in a potentially unknown configuration. A project at PNNL is using regular and nickel-quenched 6LiF/ZnS neutron-scintillator sheets and wavelength shifting plastic for light pipes in place of 3He. A combination of laboratory and modeling work predicts a LiF/ZnS-based system to be able to match or exceed the performance of the best 3He-based systems available. Also, the Ni-quenched material is expected to allow for improved neutron/gamma-ray discrimination at twice the event rate relative to the non-Ni-quenched LiF/ZnS. A new system based on the LiF/ZnS material is under construction and components are being used to optimize the detection efficiency and neutron/gamma-ray discrimination properties. Components of the new system are partially constructed and undergoing performance testing utilizing high-speed digitizers with field programmable gate arrays to perform the neutron/gamma-ray discrimination. The expected performance of the full-scale system is expected to be nearly the same as for 3He-based systems and is due for completion in 2016.

  20. Systematics of the breakup probability function for {sup 6}Li and {sup 7}Li projectiles

    Energy Technology Data Exchange (ETDEWEB)

    Capurro, O.A., E-mail: capurro@tandar.cnea.gov.ar [Laboratorio TANDAR, Comisión Nacional de Energía Atómica, Av. General Paz 1499, B1650KNA San Martín, Buenos Aires (Argentina); Pacheco, A.J.; Arazi, A. [Laboratorio TANDAR, Comisión Nacional de Energía Atómica, Av. General Paz 1499, B1650KNA San Martín, Buenos Aires (Argentina); CONICET, Av. Rivadavia 1917, C1033AAJ Buenos Aires (Argentina); Carnelli, P.F.F. [CONICET, Av. Rivadavia 1917, C1033AAJ Buenos Aires (Argentina); Instituto de Investigación e Ingeniería Ambiental, Universidad Nacional de San Martín, 25 de Mayo y Francia, B1650BWA San Martín, Buenos Aires (Argentina); Fernández Niello, J.O. [Laboratorio TANDAR, Comisión Nacional de Energía Atómica, Av. General Paz 1499, B1650KNA San Martín, Buenos Aires (Argentina); CONICET, Av. Rivadavia 1917, C1033AAJ Buenos Aires (Argentina); Instituto de Investigación e Ingeniería Ambiental, Universidad Nacional de San Martín, 25 de Mayo y Francia, B1650BWA San Martín, Buenos Aires (Argentina); and others

    2016-01-15

    Experimental non-capture breakup cross sections can be used to determine the probability of projectile and ejectile fragmentation in nuclear reactions involving weakly bound nuclei. Recently, the probability of both type of dissociations has been analyzed in nuclear reactions involving {sup 9}Be projectiles onto various heavy targets at sub-barrier energies. In the present work we extend this kind of systematic analysis to the case of {sup 6}Li and {sup 7}Li projectiles with the purpose of investigating general features of projectile-like breakup probabilities for reactions induced by stable weakly bound nuclei. For that purpose we have obtained the probabilities of projectile and ejectile breakup for a large number of systems, starting from a compilation of the corresponding reported non-capture breakup cross sections. We parametrize the results in accordance with the previous studies for the case of beryllium projectiles, and we discuss their systematic behavior as a function of the projectile, the target mass and the reaction Q-value.

  1. A study of the proton spectra following the capture of $K^-$ in $^6$Li and $^{12}$C with FINUDA

    CERN Document Server

    Agnello, M; Benussi, L; Bertani, M; Bhang, H C; Bianco, S; Bonomi, G; Botta, E; Bregant, M; Bressani, Tullio; Bufalino, S; Busso, L; Calvo, D; Camerini, P; Cerello, P; Dalena, B; Mori, F D; D'Erasmo, G; Santo, D D; Elia, D; Fabbri, F L; Faso, D; Feliciello, A; Filippi, A; Filippini, V; Fini, R A; Fiore, E M; Fujioka, H; Gianotti, P; Grion, N; Hartmann, O; Krasnoperov, A V; Lenti, V; Lucherini, V; Manzari, V; Marcello, S; Maruta, T; Mirfakhraee, N; Morra, O; Nagae, T; Olin, A; Outa, H; Pace, E; Pallotta, M; Palomba, M; Pantaleo, A; Panzarasa, A; Paticchio, V; Piano, S; Pompili, F; Rui, R; Simonetti, G; Tereshchenko, V V; Tomassini, S; Toyoda, A; Wheadon, R; Zenoni, A

    2006-01-01

    Momenta spectra of protons emitted following the capture of $K^-$ in $^6$Li and $^{12}$C have been measured with 1% resolution. The $^{12}$C spectrum is smooth whereas for $^6$Li a well defined peak appears at about 500 MeV/$c$. The first observation of a structure in this region was identified as a strange tribaryon or, possibly, a $\\bar K$-nuclear state. The peak is correlated with a $\\pi^-$ coming from $\\Sigma^-$ decay in flight, selected by setting momenta larger than 275 MeV/$c$. The $\\Sigma^-$ could be produced, together with a 500 MeV/$c$ proton, by the capture of a $K^-$ in a deuteron-cluster substructure of the $^6$Li nucleus. The capture rate for such a reaction is $(1.62\\pm 0.23_{stat} ^{+0.71}_{-0.44}(sys))%/K^-_{stop}$, in agreement with the existing observations on $^4$He targets and with the hypothesis that the $^6$Li nucleus can be interpreted as a $(d+\\alpha)$ cluster.

  2. Towards {sup 6}Li-{sup 40}K ground state molecules

    Energy Technology Data Exchange (ETDEWEB)

    Brachmann, Johannes Felix Simon

    2013-02-08

    The production of a quantum gas with strong long - range dipolar interactions is a major scientific goal in the research field of ultracold gases. In their ro - vibrational ground state Li-K dimers possess a large permanent dipole moment, which could possibly be exploited for the realization of such a quantum gas. A production of these molecules can be achieved by the association of Li and K at a Feshbach resonance, followed by a coherent state transfer. In this thesis, detailed theoretical an experimental preparations to achieve state transfer by means of Stimulated Raman Adiabatic Passage (STIRAP) are described. The theoretical preparations focus on the selection of an electronically excited molecular state that is suitable for STIRAP transfer. In this context, molecular transition dipole moments for both transitions involved in STIRAP transfer are predicted for the first time. This is achieved by the calculation of Franck-Condon factors and a determination of the state in which the {sup 6}Li-{sup 40}K Feshbach molecules are produced. The calculations show that state transfer by use of a single STIRAP sequence is experimentally very well feasible. Further, the optical wavelengths that are needed to address the selected states are calculated. The high accuracy of the data will allow to carry out the molecular spectroscopy in a fast and efficient manner. Further, only a comparatively narrow wavelength tuneability of the spectroscopy lasers is needed. The most suitable Feshbach resonance for the production of {sup 6}Li-{sup 40}K molecules at experimentally manageable magnetic field strengths is occurring at 155 G. Experimentally, this resonance is investigated by means of cross-dimensional relaxation. The application of the technique at various magnetic field strengths in the vicinity of the 155 G Feshbach resonance allows a determination of the resonance position and width with so far unreached precision. This reveals the production of molecules on the atomic side

  3. Compounds of 6Li and natural Li for EPR dosimetry in photon/neutron mixed radiation fields.

    Science.gov (United States)

    Lund, E; Gustafsson, H; Danilczuk, M; Sastry, M D; Lund, A

    2004-05-01

    Formates and dithionates of 6Li, enriched and 7Li in natural composition of Li offer a possibility to measure the absorbed dose from photons and thermal neutrons in a mixed radiation field for instance at a boron neutron capture therapy (BNCT) facility. Tests with formates and dithionates of enriched 6Li and lithium compounds with natural composition have been performed at the BNCT facility at Studsvik, Sweden. Irradiations have been performed at 3 cm depth in a Perspex phantom in a fluence rate of thermal neutrons 1.8 x 10(9) n cm(-2) s(-1). The compounds were also irradiated in a pure X-ray field from a 4MV linear accelerator at 5 cm depth in a phantom with accurately determined absorbed doses. The signal intensity and shape was investigated within 3 h after the irradiation. A single line spectrum attributed to the CO2- radical was observed after irradiation of lithium formate. An increase in line width occurring after neutron irradiation in comparison with photon irradiation of the 6Li sample was attributed to dipolar broadening between CO2- radicals trapped in the tracks of the alpha particles. A spectrum due to the SO3- radical anion was observed after irradiation of lithium dithionate. The signal amplitude increased using the 6Li in place of the Li with natural composition of isotopes, in studies with low energy X-ray irradiation. Due to the decreased line width, caused by the difference in g(N) and I between the isotopes, the sensitivity with 6Li dithionate may be enhanced by an order of magnitude compared to alanine dosimetry. After comprehensive examination of the different combinations of compounds with different amounts of 6Li and 7Li regarding dosimetry, radiation chemistry and EPR properties these dosimeter material might be used for dose determinations at BNCT treatments and for biomedical experiments. Interesting properties of the radical formation might be visible due to the large difference in ionization density of neutrons compared to photons.

  4. The Trojan-Horse Method applied to the {sup 6}Li(p,{alpha}){sup 3}He reaction down to astrophysical energies

    Energy Technology Data Exchange (ETDEWEB)

    Tumino, A.; Spitaleri, C.; Pappalardo, L.; Cherubini, S.; Del Zoppo, A.; La Cognata, M.; Musumarra, A.; Pellegriti, M.G.; Pizzone, R.G.; Rinollo, A.; Romano, S.; Typel, S

    2004-04-05

    The Trojan-Horse Method has been applied to the three-body d({sup 6}Li,{alpha}{sup 3}He)n break-up reaction in order to extract the bare nucleus S(E) factor for the {sup 6}Li(p,{alpha}){sup 3}He down to astrophysical energies.

  5. Theory of laser enhancement and suppression of cold reactions: the fermion-boson 6Li+7Li2(variant Planck's over 2pi omega0) 6Li7Li+7Li radiative collision.

    Science.gov (United States)

    Li, Xuan; Parker, Gregory A; Brumer, Paul; Thanopulos, Ioannis; Shapiro, Moshe

    2008-03-28

    We present a nonperturbative time-dependent quantum mechanical theory of the laser catalysis and control of a bifurcating A+BC(variant Planck's over 2pi omega(0))ABC*(v)(variant Planck's over 2pi omega(0) )AB+C reaction, with ABC*(v) denoting an intermediate, electronically excited, complex of ABC in the vth vibrational state. We apply this theory to the low collision energy fermion-boson light-induced exchange reaction, (6)Li((2)S)+(7)Li(2)((3)Sigma(u)(+))(variant Planck's over 2pi omega(0))((6)Li(7)Li(7)Li)*(variant Planck's over 2pi omega(0))(6)Li(7)Li((3)Sigma(+))+(7)Li((2)S). We show that at very low collision energies and energetically narrow (approximately 0.01 cm(-1)) initial reactant wave packets, it is possible to tune the yield of the exchange reaction from 0 to near-unity (yield >or=99%) values. Controllability is somewhat reduced at collisions involving energetically wider (approximately 1 cm(-1)) initial reactant wave packets. At these energetic bandwidths, the radiative reactive control, although still impressive, is limited to the 0%-76% reactive-probabilities range.

  6. Projectile breakup dynamics for {sup 6}Li+{sup 59}Co: Kinematical analysis of {alpha}-d coincidences

    Energy Technology Data Exchange (ETDEWEB)

    Souza, F.A.; Carlin, N.; Liguori Neto, R.; Siqueira-Mello, C.; Moura, M.M. de; Munhoz, M.G.; Oliveira, R.A.N.; Santo, M.G. del; Suaide, A.A.P.; Szanto, E.M.; Szanto de Toledo, A. [Instituto de Fisica - Universidade de Sao Paulo, Departamento de Fisica Nuclear, Sao Paulo, SP (Brazil); Beck, C. [CNRS-IN2P3 and Universite Louis Pasteur, Institut Pluridisciplinaire Hubert Curien, UMR 7178, Strasbourg (France); Keeley, N. [The Andrzej Soltan Institute for Nuclear Studies, Department of Nuclear Reactions, Warsaw (Poland); Diaz-Torres, A. [University of Surrey, Department of Physics, Faculty of Engineering and Physical Sciences, Guildford (United Kingdom)

    2010-05-15

    A study of the kinematics of the {alpha} -d coincidences in the {sup 6}Li+{sup 59}Co system at a bombarding energy of E{sub lab}=29.6 MeV is presented. With exclusive measurements performed over different angular intervals it is possible to identify the respective contributions of the sequential and direct projectile breakup components. The angular distributions of both breakup components are fairly well described by the Continuum-Discretized Coupled-Channels framework (CDCC). Furthermore, a careful analysis of these processes using a semiclassical approach provides information on both their lifetime and their distance of occurrence with respect to the target. Breakup to the low-lying (near-threshold) continuum is delayed, and happens at large internuclear distances. This suggests that the influence of the projectile breakup on the complete fusion process can be related essentially to the direct breakup to the {sup 6}Li high-lying continuum spectrum. (orig.)

  7. Comparison of Thermal Neutron Detection Efficiency of $^{6}$Li Scintillation Glass and $^{3}$He Gas Proportional Tube

    CERN Document Server

    Xu, Ming; Chen, Guo-Ming; Tao, Jun-Quan

    2013-01-01

    We report on a comparison study of the $^{3}$He gas proportional tube and the $^{6}$Li incorporated scintillation glasses on thermal neutron detection efficiency. Both $^{3}$He and $^{6}$Li are used commonly for thermal neutron detection because of their high neutron capture absorption coefficient. By using a neutron source $^{252}$Cf and a paraffin moderator in an alignment system, we can get a small beam of thermal neutrons. A flash ADC is used to measure the thermal neutron spectrum of each detector, and the detected number of events is determined from the spectrum, then we can calculate the detection efficiency of different detectors. Meanwhile, the experiment have been modeled with GEANT4 to validate the results against the Monte Carlo simulation.

  8. Astrophysical S-factor for $^6$Li$(p,\\gamma)$$^7$Be in the coupled-channel Gamow shell model

    CERN Document Server

    Dong, G X; Michel, N; Płoszajczak, M

    2015-01-01

    We have applied the Gamow shell model (GSM) in the coupled-channel representation to study the astrophysical $S$-factor for the proton radiative capture reaction of $^6$Li. Reaction channels are built by coupling the proton wave function expanded in different partial waves with the GSM wave functions of the ground state ($1^+$) and the excited states ($3^+_1$, $0^+_1$ and $2^+_1$) of $^6$Li. All relevant $E1$, $M1$, and $E2$ transitions from the initial continuum states in $^7$Be to the final bound states (${3/2}^-_1$ and ${1/2}^-_1$) states are included. It is found that the calculated total astrophysical $S$ factor for this reaction agrees well with the experimental data.

  9. Integration of a $^6$LiInSe$_2$ Thermal Neutron Detector into a CubeSat Instrument

    CERN Document Server

    Egner, Joanna C; Burger, Arnold; Stassun, Keivan G; Buliga, Vladimir; Matei, Liviu; Bodnarik, Julia G; Stowe, Ashley C; Prettyman, Thomas H

    2016-01-01

    We present a preliminary design for a novel neutron detection system that is compact, lightweight, and low power consuming, utilizing the CubeSat platform making it suitable for space-based applications. This is made possible using the scintillating crystal lithium indium diselenide ($^6$LiInSe$_2$), the first crystal to include $^6$Li in the crystalline structure, and a silicon avalanche photodiode (Si-APD). The schematics of this instrument are presented as well as the response of the instrument to initial testing under alpha radiation. A principal aim of this work is to demonstrate the feasibility of such a neutron detection system within a CubeSat platform. The entire end-to-end system presented here is 10 cm x 10 cm x 15 cm, weighs 670 grams and requires 5 Volts direct current at 3 Watts.

  10. Study of the {sup 9}Be(p,{alpha}){sup 6}Li reaction via the Trojan Horse Method

    Energy Technology Data Exchange (ETDEWEB)

    Romano, S.; Lamia, L.; Spitaleri, C.; Cherubini, S.; Gulino, M.; La Cognata, M.; Tumino, A. [INFN, Laboratori Nazionali del Sud, Catania (Italy); Universita di Catania, Dipartimento di Metodologie Fisiche e Chimiche per l' Ingegneria, Catania (Italy); Li, C.; Pizzone, R.G. [INFN, Laboratori Nazionali del Sud, Catania (Italy)

    2006-03-15

    The Trojan Horse Method has been applied to the {sup 2}H({sup 9}Be,{sup 6}Li{alpha})n three-body reaction in order to investigate the {sup 9}Be(p,{alpha}){sup 6}Li two-body reaction, which is involved in the study of light element abundances (lithium, beryllium and boron). A coincidence measurement was performed in order to identify the presence of the quasi-free mechanism in the three-body reaction, needed for the application of the method. The astrophysical S(E)-factor was extracted and compared to direct data. No information about electron screening effects can be extracted due to the poor resolution of the indirect data. (orig.)

  11. Formation of η{sup '} (958) meson bound states by the {sup 6}Li(γ,d) reaction

    Energy Technology Data Exchange (ETDEWEB)

    Miyatani, M.; Nagahiro, H.; Hirenzaki, S. [Nara Women' s University, Department of Physics, Nara (Japan); Ikeno, N. [Tottori University, Department of Regional Environment, Tottori (Japan)

    2016-07-15

    We have investigated the {sup 6}Li(γ,d) reaction theoretically for the formation of the η{sup '}(958) mesic nucleus close to the recoilless kinematics. We have developed the theoretical formula and reported the quantitative results of the formation spectra for various cases in this article. We have found that the formation cross sections are reduced by the effects of the fragile deuteron form factor. (orig.)

  12. Theoretical study of the α +d →6Li +γ astrophysical capture process in a three-body model

    Science.gov (United States)

    Tursunov, E. M.; Kadyrov, A. S.; Turakulov, S. A.; Bray, I.

    2016-07-01

    The astrophysical capture process α +d →6Li is studied in a three-body model. The initial state is factorized into the deuteron bound state and the (α +d )-scattering state. The final nucleus 6Li (1+) is described as a three-body bound state α +n +p in the hyperspherical Lagrange-mesh method. The contribution of the E 1 -transition operator from the initial isosinglet states to the isotriplet components of the final state is estimated to be negligible. An estimation of the forbidden E 1 transition to the isosinglet components of the final state is comparable with the corresponding results of the two-body model. However, the contribution of the E 2 -transition operator is found to be much smaller than the corresponding estimations of the two-body model. The three-body model perfectly matches the new experimental data of the LUNA Collaboration with the spectroscopic factor of 2.586 estimated from the bound-state wave functions of 6Li and a deuteron.

  13. Unified description of $^6$Li structure and deuterium-$^4$He dynamics with chiral two- and three-nucleon forces

    CERN Document Server

    Hupin, Guillaume; Navrátil, Petr

    2014-01-01

    Prototype for the study of weakly bound projectiles colliding on stable targets, the scattering of deuterium ($d$) on $^4$He ($\\alpha$) is an important milestone in the search for a fundamental understanding of low-energy reactions. At the same time, it is also important for its role in the Big-bang nucleosynthesis of $^6$Li and applications in the characterization of deuterium impurities in materials. We present the first unified {\\em ab initio} study of the $^6$Li ground state and $d$-$^4$He elastic scattering using two- and three-nucleon forces derived within the framework of chiral effective field theory. The six-nucleon bound-state and scattering observables are calculated by means of the no-core shell model with continuum. %and are compared to available experimental data. We analyze the influence of the dynamic polarization of the deuterium and of the chiral three-nucleon force, and examine the role of the continuum degrees of freedom in shaping the low-lying spectrum of $^6$Li. We find that the adopted...

  14. First direct measurement of the 2H(α,γ)6Li cross section at big bang energies and the primordial lithium problem.

    Science.gov (United States)

    Anders, M; Trezzi, D; Menegazzo, R; Aliotta, M; Bellini, A; Bemmerer, D; Broggini, C; Caciolli, A; Corvisiero, P; Costantini, H; Davinson, T; Elekes, Z; Erhard, M; Formicola, A; Fülöp, Zs; Gervino, G; Guglielmetti, A; Gustavino, C; Gyürky, Gy; Junker, M; Lemut, A; Marta, M; Mazzocchi, C; Prati, P; Rossi Alvarez, C; Scott, D A; Somorjai, E; Straniero, O; Szücs, T

    2014-07-25

    Recent observations of (6)Li in metal poor stars suggest a large production of this isotope during big bang nucleosynthesis (BBN). In standard BBN calculations, the (2)H(α,γ)(6)Li reaction dominates (6)Li production. This reaction has never been measured inside the BBN energy region because its cross section drops exponentially at low energy and because the electric dipole transition is strongly suppressed for the isoscalar particles (2)H and α at energies below the Coulomb barrier. Indirect measurements using the Coulomb dissociation of (6)Li only give upper limits owing to the dominance of nuclear breakup processes. Here, we report on the results of the first measurement of the (2)H(α,γ)(6)Li cross section at big bang energies. The experiment was performed deep underground at the LUNA 400 kV accelerator in Gran Sasso, Italy. The primordial (6)Li/(7)Li isotopic abundance ratio has been determined to be (1.5 ± 0.3) × 10(-5), from our experimental data and standard BBN theory. The much higher (6)Li/(7)Li values reported for halo stars will likely require a nonstandard physics explanation, as discussed in the literature.

  15. Measuring the ratio of aqueous diffusion coefficients between 6Li +Cl - and 7Li +Cr - by osmometry

    Science.gov (United States)

    Fritz, Steven J.

    1992-10-01

    Osmotic equilibrium is a singular occurrence in the evolution of an osmotic cell because at this event the net solution flux is zero such that -J w · V¯w = J s · V¯s. At this juncture, the diffusion coefficient of the solute through the membrane (ω) equals the solute flux ( Js) divided by the osmotic pressure (ΔΠ). Because the solute permeability coefficient (ω) is related to the Fickian diffusion coefficient ( D) through the gas constant, temperature, and the membrane's thickness and tortuosity, the ratio of ω values for individual isotopic species equals the ratio of D values for the same isotopic components. A 0.9450 molal LiCl solution was placed within sealed dialysis tubing and osmoted against a kilogram of deionized water at 22°C. Osmotic equilibrium occurred at 164 ± 10 min. The ratio of ω6Li +Cl -/ω7Li +Cl - was measured to be 1.011 ± 0.003 - a value close to the square root of the mass ratio between 7LiCl and 6LiCl (= 1.012) as calculated by Graham's Law. The measured diffusion coefficient ratio was used to predict the degree of hyperfiltration-induced fractionation of Li isotopes as a function of membrane ideality. When a membrane's σ exceeds 0.95 (as is likely for low-porosity shales) the 6Li /7Li ratio on the high-pressure side of the membrane can theoretically vary by more than 0.0017.

  16. Probing the role of Skyrme interactions on the fission dynamics of the 6Li + 238U reaction

    Science.gov (United States)

    Sharma, Ishita; Kumar, Raj; Sharma, Manoj K.

    2017-06-01

    The performance of selected five Skyrme forces (out of a set of 240), tested by Dutra et al., is analyzed in view of fusion-fission dynamics. These forces are assumed to perform better for neutron-rich systems, so the choice of the reaction is accordingly made by opting for a neutron-rich target in 6Li + 238U reaction. This reaction is diagnosed further in reference to fusion hindrance within the dynamical approach of the cluster-decay model (DCM). In order to reduce the computational time, three Skyrme forces are figured out with the criteria that these forces cover the barrier characteristics of the remaining two forces as well. The fission cross-sections are successfully addressed at low energies for the 6Li + 238U reaction. However, at relatively higher energies, the excitation functions show theoretical suppression with respect to experimental data, which may be associated with the possible existence of incomplete fusion (ICF). For ICF, we have considered that the 6Li broke into 4He + 2H, as mentioned in the experimental work. The calculations of ICF are carried out for the 4He + 238U reaction with the selected Skyrme forces at E_{c.m.} = 26.20 and 27.51 MeV. These forces address the data nicely for the compound nucleus (CN) as well as ICF processes. Here, the NRAPR force seems to require lesser barrier modification as compared to the other forces, therefore it can be used as an alternate choice for calculating the interaction potential. Additionally, the prediction of cross-sections at lower energies has been done with DCM using the NRAPR force. The ℓ-dependent % barrier modification of the Skyrme forces undertaken is also worked out in reference to fusion hindrance at below barrier energies.

  17. Role of neutron transfer processes on the 6Li+120Sn and 7Li+119Sn fusion reactions

    Directory of Open Access Journals (Sweden)

    Fisichella M.

    2015-01-01

    Full Text Available The results concerning the study of 6Li+120Sn and 7Li+119Sn systems are presented. These two sistems are characterised by very similar structures of the interacting nuclei and by different Q-value for one-and two- neutron transfer. Our aim is to disentangle the possible effects due to the different n-transfer Q-values, at sub-barriers energies, by comparing the two fusion excitation function. In these experiments the fusion cross section has been measured by using a stack activation technique. No particular differences in the two fusion excitation functions have been observed.

  18. Study of Two-Step Mechanisms in Pion Absorption on $^{6}Li$, $^{12}C$ via Deuteron Emission

    CERN Document Server

    Huber, G M; Papandreou, Z; Hovdebo, J; Naqvi, S I H; Ottewell, D F; Walden, P L; Jones, G; Aslanoglou, X

    2000-01-01

    The (pi+,pd), and (pi+,dd) reactions were investigated with pions of 100 and 165 MeV kinetic energy on 6Li and 12C targets. In comparison with previously published (pi+,pp) data on the same targets and at the same beam energies, kinematic regions were identified in which the neutron pickup process n+p->d dominated the observed deuteron yield. The importance of this mechanism increases with energy, contributing half of the observed cross section at 165 MeV. The contribution of direct quasi-triton absorption is significant only at 100 MeV.

  19. {sup 16}O resonances near 4α threshold through {sup 12}C({sup 6}Li,d) reaction

    Energy Technology Data Exchange (ETDEWEB)

    Rodrigues, M. R. D.; Borello-Lewin, T.; Miyake, H.; Horodynski-Matsushigue, L. B.; Duarte, J. L. M.; Rodrigues, C. L.; Faria, P. Neto de [Instituto de Física, Universidade de São Paulo, Caixa Postal 66318, CEP 05314-970, São Paulo, SP (Brazil); Cunsolo, A.; Cappuzzello, F.; Foti, A.; Agodi, C.; Cavallaro, M. [INFN - Laboratori Nazionali del Sud, Via S. Sofia 62, 95125 Catania (Italy); Napoli, M. di; Ukita, G. M. [Faculdade de Psicologia, Universidade de Santo Amaro, R. Prof. Eneas da Siqueira Neto, 340, CEP 04829-300, São Paulo, SP (Brazil)

    2014-11-11

    Several narrow alpha resonant {sup 16}O states were detected through the {sup 12}C({sup 6}Li,d) reaction, in the range of 13.5 to 17.5 MeV of excitation energy. The reaction was measured at a bombarding energy of 25.5 MeV employing the São Paulo Pelletron-Enge-Spectrograph facility and the nuclear emulsion technique. Experimental angular distributions associated with natural parity quasi-bound states around the 4α threshold are presented and compared to DWBA predictions. The upper limit for the resonance widths obtained is near the energy resolution (15 keV)

  20. (p,px) reaction on /sup 6/Li and /sup 7/Li nuclei at incident proton energy of 70 MeV

    Energy Technology Data Exchange (ETDEWEB)

    Gorpinich, O.K.; Kadkin, E.P.; Kondrat' ev, S.N.; Lobach, Yu.M.; Pasechnik, M.V.; Saltykov, L.S.; Tokarevskij, V.V. (AN Ukrainskoj SSR, Kiev. Inst. Yadernykh Issledovanij)

    1983-01-01

    Measurements of two-dimensional coincidence spectra of charged particles from the /sup 6/Li(p, 2p)/sup 5/He, /sup 6/Li(p, p..cap alpha..)/sup 2/H, /sup 7/Li(p, pt)/sup 4/He, /sup 7/Li(p, p..cap alpha..)/sup 3/H reactions has been carried out using the equipment for simultaneous investigation of correlation of charged particles of different types. The /sup 6/Li(p, pd) reaction probability reaches the maximum value when the residual nucleus momentum is close to zero. This fact may confirm an existance of strong /sup 6/Li ..cap alpha..d-clusterization. The /sup 7/Li(p, pt) reaction occurs with the minimum probability in a quasi-free region that confirms /sup 7/Li ..cap alpha..t-structure. A direct comparison of particle two-dimensional spectra projections of (p, px) type reactions reveals that a probability of quasi-free scattering of proton on deuteron (triton) /sup 6/Li(/sup 7/Li) cluster is higher than quasi-free scattering on intranuclear protons. This fact is also confirmed by an assumption on ..cap alpha..d(..cap alpha..t)-cluster /sup 6/Li(/sup 7/Li) nucleus structure.

  1. Analysis of the normal optical, Michel and molecular potentials on the $^{40}$Ca($^6$Li, d)$^{44}$ Ti reaction

    Indian Academy of Sciences (India)

    MAZUMDER UTTAM K; SOMADDER ANOCK; HOQUE ENAMUL; HAQUE YASMEEN; DAS SUSANTA K; SEN GUPTA H M

    2016-06-01

    Full finite-range (FFR) distorted-wave Born approximation (DWBA) method has been applied to analyse the angular distributions of cross-sections of the $^{40}$Ca($^{6}$Li, d)$^{44}$Ti reaction at 28 MeV incident energy for the 22 transitions involving both the bound and unbound states of $^{44}$Ti byusing the normal optical, Michel and molecular potentials. The extracted spectroscopic factors for the three optical potentials are compared with those of some previous studies of zero-range (ZR) calculations of the$^{40}$Ca($^{6}$Li, d)$^{44}$Ti reaction using the normal optical potential. The $\\chi^{2}$ values of all the levels are obtained for the three optical potentials to estimate the quality of the fits. Molecular and Michel potentials have been used for the first time to analyse the four-nucleon transfer reaction and it seems that the molecular potential fits the experimental data more satisfactorily for some of the states than the normal optical and Michel potentials.

  2. Low energy R-matrix fits for the 6Li(d,a)4He S factor

    CERN Document Server

    Grineviciute, J; Lamia, L; Spitaleri, C; La Cognata, M

    2014-01-01

    Background: The information about the 6Li(d,a)4He reaction rates of the astrophysical interest can be obtained by extrapolating direct data to the lower energies, or by indirect methods. The indirect Trojan Horse method, as well as various R-matrix and polynomial fits to direct data, estimate the electron screening energies much larger than the adiabatic limit. Calculations that include the subthreshold resonance estimate smaller screening energies. Purpose: Obtain the 6Li(d,a)4He reaction R-matrix parameters and the astrophysical S factor for the energies relevant to the stellar plasmas by fitting the R-matrix formulas for the subthreshold resonances to the S factor data above 60 keV. Methods: The bare S factor is calculated using the single and the two-level R-matrix formulas for the closest to the threshold 0+ and 2+ subthreshold states at 22.2, 20.2 and 20.1 MeV. The electron screening potential Ue is then obtained by fitting it as a single parameter to the low energy data. Results: The low energy S facto...

  3. Theoretical study of the $\\alpha+d$ $\\rightarrow$ $^6$Li + $\\gamma $ astrophysical capture process in a three-body model

    CERN Document Server

    Tursunov, E M; Turakulov, S A; Bray, I

    2016-01-01

    The astrophysical capture process $\\alpha+d$ $\\rightarrow$ $^6$Li + $\\gamma$ is studied in a three-body model. The initial state is factorized into the deuteron bound state and the $\\alpha+d$ scattering state. The final nucleus $^6$Li(1+) is described as a three-body bound state $\\alpha+n+p$ in the hyperspherical Lagrange-mesh method. The contribution of the E1 transition operator from the initial isosinglet states to the isotriplet components of the final state is estimated to be negligible. An estimation of the forbidden E1 transition to the isosinglet components of the final state is comparable with the corresponding results of the two-body model. However, the contribution of the E2 transition operator is found to be much smaller than the corresponding estimations of the two-body model. The three-body model perfectly matches the new experimental data of the LUNA collaboration with the help of the spectroscopic factor 2.586, very consistent with the three-body structure of the final state.

  4. Resonance and non-resonance effect of continuum states of 6Li on elastic scattering angular distributions

    Science.gov (United States)

    Gómez Camacho, A.

    2016-07-01

    CDCC calculations of elastic scattering angular distributions for reactions of the weakly bound projectile 6Li with targets 28Si and 58Ni at energies around the Coulomb barrier are presented. Special emphasis is given to account for the effect of couplings from 6Li resonance states l = 2, J π = 3+, 2+, 1+. Similarly, the effect produced by non-resonant state couplings is studied. The convergent calculations are carried out with global α-target and d-target interactions. The calculated elastic scattering angular distributions are in general in good agreement with the measurements for the systems considered in this work. It is found that the calculations with only resonance states are very similar to that with all couplings (resonance+non-resonance). So, the absence of these states have a strong effect on elastic scattering (non-resonance states calculation). It is shown that the effects increase as the collision energy increases. An interpretation of the strength of the different effects is given in terms of the polarization potentials that emerge from the different couplings.

  5. Prospective conceptual qualification of hybrid centrifugation/distillatory for {sup 6}LI nuclear fusion technology scaled supply demands; Calificacion conceptual prospectiva de centrifugador/destilador hibrido para produccion de {sup 6}Li a demanda de la tecnologia Nuclear Fusion

    Energy Technology Data Exchange (ETDEWEB)

    Sedano, L.; Herranz, J. L.; Casado, J. L.; Castro, P.; Xiberta, J.

    2013-07-01

    The change in the demand for exploitation of lithium as a resource appears during the last decade, related to the development of the ion-Li batteries market and with the requirements of Nuclear Fusion fuels (deuterium and lithium) as coming energy option. A prospective analysis of synergistic demands of both markets, in its technical and in its economic aspects appears of prospective interest. The civil market {sup 6}Li/{sup 7}Li enrichment demand is analyzed. Specific technological developments permitting on-line production according to demand is discussed. A [centrifugation /thermal diffusion / combined distillation] technique is selected and qualified as technologically viable option for scaled production of litiated-forms. A conceptual design of a production plant is finally proposed according to the new technical capability.

  6. 同位素7Li和6Li的性质殊异%The diverse of isotopes 7 Li and 6 Li

    Institute of Scientific and Technical Information of China (English)

    朱正和; 宋江锋; 罗德礼

    2014-01-01

    本文研究了同位素7 Li和6 Li在几个方面的性质差异.用相对论量子力学计算指出,6 Li的电子能级比7 Li的能级低,同时,对电偶极E (1)和磁偶极M (1)的能级跃迁波长,6 Li的跃迁波长都要比7 Li的长.由于7 Li和6 Li的核自旋的大小不同,可以看出在磁场2万高斯和温度100-20 K之间,7 Li的磁极化比6 Li的约大13倍.7 Li和6 Li的磁极化这种差异,也是一种可能的同位素7 Li/6 Li的分离方法.%The diverse of isotopes 7 Li and 6 Li was examined on the several respects.The calculations of relativistic quantum mechanics shows that the energy levels of 6 Li are lower than that of 7 Li, and therefore the transitional wave length of E(1) and M(1) for 6 Li are longer than that of 7 Li.The variation of couple constant due to the different nu-clear spin of 7 Li and 6 Li could be as a basis for the isotope separation between 7 Li and 6 Li.Ratio of the molar intensi-ty of magnetization of 7 Li to 6 Li is about 13 under 100-20 K and 20, 000 gauss, which is favorable to separate out 6 Li.

  7. Nuclear structure with accurate chiral perturbation theory nucleon-nucleon potential: Application to 6Li and 10B

    Energy Technology Data Exchange (ETDEWEB)

    Navratil, P; Caurier, E

    2003-10-14

    The authors calculate properties of A = 6 system using the accurate charge-dependent nucleon-nucleon (NN) potential at fourth order of chiral perturbation theory. By application of the ab initio no-core shell model (NCSM) and a variational calculation in the harmonic oscillator basis with basis size up to 16 {h_bar}{Omega} they obtain the {sup 6}Li binding energy of 28.5(5) MeV and a converged excitation spectrum. Also, they calculate properties of {sup 10}B using the same NN potential in a basis space of up to 8 {h_bar}{Omega}. The results are consistent with results obtained by standard accurate NN potentials and demonstrate a deficiency of Hamiltonians consisting of only two-body terms. At this order of chiral perturbation theory three-body terms appear. It is expected that inclusion of such terms in the Hamiltonian will improve agreement with experiment.

  8. Effect of compound nuclear reaction mechanism in 12C(6Li,d) reaction at sub-Coulomb energy

    Science.gov (United States)

    Mondal, Ashok; Adhikari, S.; Basu, C.

    2017-09-01

    The angular distribution of the 12C(6Li,d) reaction populating the 6.92 and 7.12 MeV states of 16O at sub-Coulomb energy (Ecm=3 MeV) are analysed in the framework of the Distorted Wave Born Approximation (DWBA). Recent results on excitation function measurements and backward angle angular distributions derive ANC for both the states on the basis of an alpha transfer mechanism. In the present work, we show that considering both forward and backward angle data in the analysis, the 7.12 MeV state at sub-Coulomb energy is populated from Compound nuclear process rather than transfer process. The 6.92 MeV state is however produced from direct reaction mechanism.

  9. Characterization of charge-exchange collisions between ultracold $\\rm{^6Li}$ atoms and $\\rm{^{40}Ca^+}$ ions

    CERN Document Server

    Saito, R; Sasakawa, M; Nakai, R; Raoult, M; Silva, H Da; Dulieu, O; Mukaiyama, T

    2016-01-01

    We investigate the energy dependence and the internal-state dependence of the charge-exchange collision cross sections in a mixture of $^6$Li atoms and $^{40}$Ca$^+$ ions in the collision energy range from 0.2 mK to 1 K. Deliberately excited ion micromotion is used to control the collision energy of atoms and ions. The energy dependence of the charge-exchange collision cross section obeys the Langevin model in the temperature range of the current experiment, and the measured magnitude of the cross section is correlated to the internal state of the $^{40}$Ca$^+$ ions. Revealing the relationship between the charge-exchange collision cross sections and the interaction potentials is an important step toward the realization of the full quantum control of the chemical reactions at an ultralow temperature regime.

  10. Hypernuclear spectroscopy of products from 6Li projectiles on a carbon target at 2 AGeV

    CERN Document Server

    Rappold, C; Nakajima, D; Saito, T R; Bertini, O; Bianchin, S; Bozkurt, V; Kavatsyuk, M; Ma, Y; Maas, F; Minami, S; Özel-Tashenov, B; Yoshida, K; Achenbach, P; Ajimura, S; Aumann, T; Gayoso, C Ayerbe; Bhang, H C; Caesar, C; Erturk, S; Fukuda, T; Göküzüm, B; Guliev, E; Hiraiwa, T; Hoffmann, J; Ickert, G; Ketenci, Z S; Khaneft, D; Kim, M; Kim, S; Koch, K; Kurz, N; Fèvre, A Le; Mizoi, Y; Moritsu, M; Nagae, T; Nungesser, L; Okamura, A; Ott, W; Pochodzalla, J; Sakaguchi, A; Sako, M; Schmidt, C J; Sekimoto, M; Simon, H; Sugimura, H; Takahashi, T; Tambave, G J; Tamura, H; Trautmann, W; Voltz, S; Yokota, N; Yoon, C J

    2013-01-01

    A novel experiment, aiming at demonstrating the feasibility of hypernuclear spectroscopy with heavy-ion beams, was conducted. Using the invariant mass method, the spectroscopy of hypernuclear products of 6Li projectiles on a carbon target at 2 AGeV was performed. Signals of the \\Lambda-hyperon and 3\\Lambda H and 4\\Lambda H hypernuclei were observed for final states of p+\\pi^-, 3He+\\pi^- and 4He+\\pi^-, respectively, with significance values of 6.7, 4.7 and 4.9\\sigma. By analyzing the proper decay time from secondary vertex distribution with the unbinned maximum likelihood fitting method, their lifetime values were deduced to be $262 ^{+56}_{-43} \\pm 45$ ps for \\Lambda, $183 ^{+42}_{-32} \\pm 37$ ps for 3\\Lambda H, and $140 ^{+48}_{-33}\\pm 35 $ ps for 4\\Lambda H.

  11. Magnetic control of ultra-cold $^6$Li and $^{174}$Yb($^3P_2$) atom mixtures with Feshbach resonances

    CERN Document Server

    Petrov, Alexander; Kotochigova, Svetlana

    2015-01-01

    We theoretically evaluate the feasibility to form magnetically-tunable Feshbach molecules in collisions between fermionic $^6$Li atoms and bosonic metastable $^{174}$Yb($^3$P$_2$) atoms. In contrast to the well-studied alkali-metal atom collisions, collisions with meta-stable atoms are highly anisotropic. Our first-principle coupled-channel calculation of these collisions reveals the existence of broad Feshbach resonances due to the combined effect of anisotropic-molecular and atomic-hyperfine interactions. In order to fit our predictions to the specific positions of experimentally-observed broad resonance structures \\cite{Deep2015} we optimized the shape of the short-range potentials by direct least-square fitting. This allowed us to identify the dominant resonance by its leading angular momentum quantum numbers and describe the role of collisional anisotropy in the creation and broadening of this and other resonances.

  12. AN UPDATED {sup 6}Li(p, {alpha}){sup 3}He REACTION RATE AT ASTROPHYSICAL ENERGIES WITH THE TROJAN HORSE METHOD

    Energy Technology Data Exchange (ETDEWEB)

    Lamia, L.; Spitaleri, C.; Sergi, M. L. [Dipartimento di Fisica e Astronomia, Universita di Catania, I-95123 Catania (Italy); Pizzone, R. G.; Tumino, A.; La Cognata, M. [INFN-Laboratori Nazionali del Sud, I-95125 Catania (Italy); Tognelli, E.; Degl' Innocenti, S.; Prada Moroni, P. G. [Dipartimento di Fisica, Universita di Pisa, I-56127 Pisa (Italy); Pappalardo, L. [Dipartimento di Fisica e Scienze della Terra, Universita di Ferrara, I-44100 Ferrara (Italy)

    2013-05-01

    The lithium problem influencing primordial and stellar nucleosynthesis is one of the most interesting unsolved issues in astrophysics. {sup 6}Li is the most fragile of lithium's stable isotopes and is largely destroyed in most stars during the pre-main-sequence (PMS) phase. For these stars, the convective envelope easily reaches, at least at its bottom, the relatively low {sup 6}Li ignition temperature. Thus, gaining an understanding of {sup 6}Li depletion also gives hints about the extent of convective regions. For this reason, charged-particle-induced reactions in lithium have been the subject of several studies. Low-energy extrapolations of these studies provide information about both the zero-energy astrophysical S(E) factor and the electron screening potential, U{sub e} . Thanks to recent direct measurements, new estimates of the {sup 6}Li(p, {alpha}){sup 3}He bare-nucleus S(E) factor and the corresponding U{sub e} value have been obtained by applying the Trojan Horse method to the {sup 2}H({sup 6}Li, {alpha} {sup 3}He)n reaction in quasi-free kinematics. The calculated reaction rate covers the temperature window 0.01 to 2T{sub 9} and its impact on the surface lithium depletion in PMS models with different masses and metallicities has been evaluated in detail by adopting an updated version of the FRANEC evolutionary code.

  13. Development of antireflection coatings with a sup 6 LiF/ sup 6 sup 2 Ni multilayer converter for ultracold neutron detectors

    CERN Document Server

    Maier-Komor, P; Bergmaier, A; Dollinger, G; Paul, S; Schott, W

    2002-01-01

    High efficiency detectors for ultracold neutrons (UCN) are needed at the new high flux neutron source, Forschungsreaktor Muenchen II. In the development described, silicon PIN diodes were chosen to detect the alpha-particles or the tritons created in the reaction sup 6 Li(n,alpha)t. The high reflectance of UCN on sup 6 Li with its positive optical potential must be compensated by a material with negative optical potential. The isotope sup 6 sup 2 Ni was chosen for this. To avoid problems due to chemical reactions of Li with humidity, the compound sup 6 LiF was chosen. One hundred and fifty double layers of sup 6 LiF/ sup 6 sup 2 Ni had to be deposited by physical vapor deposition on silicon PIN diodes which had already been coated with 88 nm approx 77 mu g/cm sup 2 of sup 5 sup 8 Ni for reflection of the UCN. The theoretical optimal thickness of the sup 6 sup 2 Ni layers is 3 nm, and that of sup 6 LiF is 6 nm. Since expensive isotopes were involved, a small source-to-substrate distance had to be used, but wit...

  14. Breakup Coupling Effects on Near-Barrier {sup 6}Li, {sup 7}Be and {sup 8}B + {sup 58}Ni Elastic Scattering Compared

    Energy Technology Data Exchange (ETDEWEB)

    Keeley, N. [Department of Nuclear Reactions, Andrzej Soltan Institute for Nuclear Studies, ul. Hoza 69, 00-681 Warsaw (Poland); Mackintosh, R.S. [Department of Physics and Astronomy, Open University, Milton Keynes, MK7 6AA (United Kingdom); Beck, C. [Institut Pluridisciplinaire Hubert Curien et Universite Louis Pasteur, Boite Postale 28, F-67037 Strasbourg Cedex 2 (France)

    2010-03-01

    New data for near-barrier {sup 6}Li, {sup 7}Be and {sup 8}B + {sup 58}Ni elastic scattering enable a comparison of breakup coupling effects for these loosely-bound projectiles. Coupled Discretised Continuum Channels (CDCC) calculations suggest that the large total reaction cross sections for {sup 8}B + {sup 58}Ni are dominated by breakup at near-barrier energies, unlike {sup 6}Li and {sup 7}Be where breakup makes a small contribution. In spite of this, the CDCC calculations show a small coupling influence due to breakup for {sup 8}B, in contrast to the situation for {sup 6}Li and {sup 7}Be. An examination of the S matrices gives a clue to this counter-intuitive behaviour.

  15. A method for investigation of the D(4He, γ)6Li reaction in the Ultralow energy region under a high background

    Science.gov (United States)

    Bystritsky, V. M.; Dudkin, G. N.; Krylov, A. R.; Gazi, S.; Huran, J.; Nechaev, B. A.; Padalko, V. N.; Sadovsky, A. B.; Tuleushev, Yu. Zh.; Filipowicz, M.; Philippov, A. V.

    2016-07-01

    The cosmological lithium problem, that is, a noticeable discrepancy between the predicted and observed abundances of lithium, is in conflict with the Standard Big Bang Nucleosynthesis model. For example, the abundance of 7Li is 2-4 times smaller than predicted by the Standard Big Bang Nucleosynthesis. As to the abundance of 6Li, recent more accurate optical investigations have yielded only the upper limit on the 6Li/7Li ratio, which makes the problem of 6Li abundance and accordingly of disagreement with the Standard Big Bang Nucleosynthesis predictions less acute. However, experimental study of the D(4He, γ)6Li reaction cross section is still of current importance because there is a theoretical approach predicting its anomalously large value in the region of energies below the Standard Big Bang Nucleosynthesis energy. The work is dedicated to the measurement of the cross section for the D(4He, γ)6Li reaction proceeding in zirconium deuteride at the incident 4He+ion energy of 36 keV. The experiment is performed at a pulsed Hall plasma accelerator with an energy spread of 20% FWHM. A method for direct measurement of the background from the reaction chain D(4He, 4He)D→D(D, n)3He→(n, γ) and/or (n, n‧γ) ending with activation of the surrounding material by neutrons is proposed and implemented in the work. An upper limit on the D(4He, γ)6Li reaction cross section σ≤7·10-36 cm2 at the 90% confidence level is obtained.

  16. A method for investigation of the D({sup 4}He, γ){sup 6}Li reaction in the Ultralow energy region under a high background

    Energy Technology Data Exchange (ETDEWEB)

    Bystritsky, V.M. [Joint Institute for Nuclear Research, Dubna (Russian Federation); Dudkin, G.N. [National Research Tomsk Polytechnic University, Tomsk (Russian Federation); Krylov, A.R. [Joint Institute for Nuclear Research, Dubna (Russian Federation); Gazi, S.; Huran, J. [Institute of Electrical Engineering, Slovak Academy of Sciences, Bratislava (Slovakia); Nechaev, B.A.; Padalko, V.N. [National Research Tomsk Polytechnic University, Tomsk (Russian Federation); Sadovsky, A.B. [Joint Institute for Nuclear Research, Dubna (Russian Federation); Tuleushev, Yu.Zh. [Institute of Nuclear Physics, Ministry of Power Engineering, Almaty (Kazakhstan); Filipowicz, M. [Faculty of Energy and Fuels, University of Science and Technologies, Krakow (Poland); Philippov, A.V. [Joint Institute for Nuclear Research, Dubna (Russian Federation)

    2016-07-21

    The cosmological lithium problem, that is, a noticeable discrepancy between the predicted and observed abundances of lithium, is in conflict with the Standard Big Bang Nucleosynthesis model. For example, the abundance of {sup 7}Li is 2–4 times smaller than predicted by the Standard Big Bang Nucleosynthesis. As to the abundance of {sup 6}Li, recent more accurate optical investigations have yielded only the upper limit on the {sup 6}Li/{sup 7}Li ratio, which makes the problem of {sup 6}Li abundance and accordingly of disagreement with the Standard Big Bang Nucleosynthesis predictions less acute. However, experimental study of the D({sup 4}He, γ){sup 6}Li reaction cross section is still of current importance because there is a theoretical approach predicting its anomalously large value in the region of energies below the Standard Big Bang Nucleosynthesis energy. The work is dedicated to the measurement of the cross section for the D({sup 4}He, γ){sup 6}Li reaction proceeding in zirconium deuteride at the incident {sup 4}He{sup +}ion energy of 36 keV. The experiment is performed at a pulsed Hall plasma accelerator with an energy spread of 20% FWHM. A method for direct measurement of the background from the reaction chain D({sup 4}He, {sup 4}He)D→D(D, n){sup 3}He→(n, γ) and/or (n, n′γ) ending with activation of the surrounding material by neutrons is proposed and implemented in the work. An upper limit on the D({sup 4}He, γ){sup 6}Li reaction cross section σ≤7·10{sup −36} cm{sup 2} at the 90% confidence level is obtained.

  17. Quasi-bound alpha resonant states populated by the {sup 12}C({sup 6}Li, d) reaction

    Energy Technology Data Exchange (ETDEWEB)

    Rodrigues, M.R.D.; Borello-Lewin, T.; Miyake, H.; Horodynski-Matsushigue, L.B.; Duarte, J.L.M.; Rodrigues, C.L.; Souza, M.A. [Universidade de Sao Paulo (IF/USP), SP (Brazil). Inst. de Fisica; Cunsolo, A.; Cappuzzello, F.; Foti, A.; Agodi, C.; Cavallaro, M. [Istituto Nazionale di Fisica Nucleare (LNS/INFN), Catania (Italy). Lab. Nazionali del Sud; Ukita, G.M. [Universidade de Santo Amaro (UNISA), Sao Paulo, SP (Brazil). Faculdade de Psicologia

    2012-07-01

    Full text: The alpha cluster phenomenon in the light nuclei structure has been the subject of a long time investigation since the proposal of the Ikeda diagrams [1]. The main purpose of the research program in progress is the investigation of this phenomenon in (x{alpha}) and (x{alpha}+n) nuclei through the ({sup 6}Li, d) alpha transfer reaction [2-4]. Alpha resonant states around the (4{alpha}) threshold in the nucleus {sup 16}O are the focus of the present contribution. In fact, the importance of these resonances at the elements production in stars is recognized, as primarily pointed out by Hoyle in {sup 12}C [6]. The existence of a rotational band with the {alpha} +{sup 12} C (Hoyle) cluster state structure was recently demonstrated by Ohkubo and Hirabayashi [6]. In order to explore this region of interest, measurements of the {sup 12}C({sup 6}Li, d){sup 16}O reaction up to 17 MeV of excitation at an incident energy of 25.5 MeV, have been performed employing the Sao Paulo Pelletron-Enge Split-Pole facility and the nuclear emulsion detection technique (plates Fuji G6B, 50 {mu}m thick). Spectra associated with six scattering angles, from 5 deg to 29 deg in the laboratory frame, each one 50 cm along the focal surface, were measured. Several narrow resonances with a quasi-bound behavior embedded in the continuum were detected and the resolution of 25 keV allowed for the separation of doublets not resolved before [7,8]. The absolute cross sections and the respective deuteron angular distributions were determined and the analysis is in progress. [1] K. Ikeda et al., Prog. Theor. Phys. Suppl. E 68, 464 (1968); H. Horiuchi, K. Ikeda, and Y. Suzuki, ibid. 44, 225 (1978). [2] M.R.D.Rodrigues et al., in12th International Conference on Nuclear Reaction Mechanism, Varenna, Italy, edited by F. Cerutti and A. Ferrari , CERN Proceedings, 2010-2, pp. 331- 335. [3] T. Borello-Lewin et al., Proceedings of SOTANCP2, Brussels, Belgium 2010, edited by P. Descouvemount et al., Int. J

  18. (/sup 6/Li,d) reactions on /sup 24/Mg and /sup 26/Mg at 73 MeV

    Energy Technology Data Exchange (ETDEWEB)

    Tanabe, T.; Haga, K.; Yasue, M.; Sato, K. (Tokyo Univ., Tanashi (Japan). Inst. for Nuclear Study); Ogino, K.; Kadota, Y.; Tochi, M.; Makino, K. (Kyoto Univ. (Japan). Faculty of Engineering); Kitahara, T. (Yamanashi Medical Coll. (Japan)); Shiba, T. (Kyoto Univ. (Japan). Lab. of Nuclear Reaction)

    1983-05-09

    The sup(24,26)Mg(/sup 6/Li, d)sup(28,30)Si reactions have been studied at 73 MeV bombarding energy. The angular distributions were analyzed with exact finite-range distorted wave Born approximation calculations assuming a direct ..cap alpha..-cluster transfer. Extracted spectroscopic strengths leading to low-lying levels of /sup 28/Si and relative spectroscopic strengths between transitions to /sup 28/Si and /sup 30/Si ground states are consistent with those previously obtained by several ..cap alpha..-transfer reactions. Many strongly populated levels have been observed at Esub(x)> or approx.10 MeV for /sup 28/Si. A marked similarity was found between the deuteron spectrum and the /sup 24/Mg(..cap alpha.., ..cap alpha..)/sup 24/Mg excitation function in this excitation energy region. A brief comparison of the present ..cap alpha..-transfer results with previous two-nucleon transfer data leading to sup(28,30)Si is also presented.

  19. Improved neutron-gamma discrimination for a 6Li-glass neutron detector using digital signal analysis methods

    Science.gov (United States)

    Wang, C. L.; Riedel, R. A.

    2016-01-01

    A 6Li-glass scintillator (GS20) based neutron Anger camera was developed for time-of-flight single-crystal diffraction instruments at Spallation Neutron Source. Traditional Pulse-Height Analysis (PHA) for Neutron-Gamma Discrimination (NGD) resulted in the neutron-gamma efficiency ratio (defined as NGD ratio) on the order of 104. The NGD ratios of Anger cameras need to be improved for broader applications including neutron reflectometers. For this purpose, six digital signal analysis methods of individual waveforms acquired from photomultiplier tubes were proposed using (i) charge integration, (ii) pulse-amplitude histograms, (iii) power spectrum analysis combined with the maximum pulse-amplitude, (iv) two event parameters (a1, b0) obtained from a Wiener filter, (v) an effective amplitude (m) obtained from an adaptive least-mean-square filter, and (vi) a cross-correlation coefficient between individual and reference waveforms. The NGD ratios are about 70 times those from the traditional PHA method. Our results indicate the NGD capabilities of neutron Anger cameras based on GS20 scintillators can be significantly improved with digital signal analysis methods.

  20. Development of neutron-monitor detector using liquid organic scintillator coupled with 6Li + ZnS(Ag) Sheet.

    Science.gov (United States)

    Sato, Tatsuhiko; Endo, Akira; Yamaguchi, Yasuhiro; Takahashi, Fumiaki

    2004-01-01

    A phoswitch-type detector has been developed for monitoring neutron doses in high-energy accelerator facilities. The detector is composed of a liquid organic scintillator (BC501A) coupled with ZnS(Ag) sheets doped with 6Li. The dose from neutrons with energies above 1 MeV is evaluated from the light output spectrum of the BC501A by applying the G-function, which relates the spectrum to the neutron dose directly. The dose from lower energy neutrons, on the other hand, is estimated from the number of scintillations emitted from the ZnS(Ag) sheets. Characteristics of the phoswitch-type detector were studied experimentally in some neutron fields. It was found from the experiments that the detector has an excellent property of pulse-shape discrimination between the scintillations of BC501A and the ZnS(Ag) sheets. The experimental results also indicate that the detector is capable of reproducing doses from thermal neutrons as well as neutrons with energies from one to several tens of megaelectronvolts (MeV).

  1. Hypernuclear production cross section in the reaction of 6Li + 12C at 2A GeV

    Directory of Open Access Journals (Sweden)

    C. Rappold

    2015-07-01

    Full Text Available Hypernuclear production cross sections have been deduced for the first time with induced reaction of heavy ion beam on fixed target and by means of the invariant mass method by the HypHI Collaboration exploiting the reaction of 6Li + 12C at 2A GeV or sNN=2.70 GeV. A production cross section of 3.9±1.4 μb for 3ΛH and of 3.1±1.0 μb for 4ΛH respectively in the projectile rapidity region was inferred as well as the total production cross section of the Λ hyperon was measured and found to be equal to 1.7±0.8 mb. A global fit based on a Bayesian approach was performed in order to include and propagate statistical and systematic uncertainties. Production ratios of 3ΛH/4ΛH, 3ΛH/Λ and 4ΛH/Λ were included in the inference procedure. The strangeness population factors S3 and S4 of 3ΛH and 4ΛH respectively were extracted. In addition, the multiplicities of the Λ hyperon, 3ΛH, and 4ΛH together with the rapidity and transversal momentum density distributions of the observed hypernuclei were extracted and reported.

  2. Hypernuclear spectroscopy of products from {sup 6}Li projectiles on a carbon target at 2A GeV

    Energy Technology Data Exchange (ETDEWEB)

    Rappold, C., E-mail: c.rappold@gsi.de [Justus-Liebig-Universität Giessen, Heinrich-Buff-Ring 16, 35392 Giessen (Germany); GSI Helmholtz Centre for Heavy Ion Research, Planckstrasse 1, 64291 Darmstadt (Germany); Kim, E. [GSI Helmholtz Centre for Heavy Ion Research, Planckstrasse 1, 64291 Darmstadt (Germany); Seoul National University, Gwanakro Sillim-dong, Gwanak-gu, Seoul 151-747 (Korea, Republic of); Nakajima, D. [GSI Helmholtz Centre for Heavy Ion Research, Planckstrasse 1, 64291 Darmstadt (Germany); The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033 (Japan); Saito, T.R., E-mail: t.saito@gsi.de [GSI Helmholtz Centre for Heavy Ion Research, Planckstrasse 1, 64291 Darmstadt (Germany); Johannes Gutenberg-Universität Mainz, J.J. Becherweg 40, 55099 Mainz (Germany); The Helmholtz Institute Mainz (HIM), J.J. Becherweg 40, 55099 Mainz (Germany); Bertini, O. [GSI Helmholtz Centre for Heavy Ion Research, Planckstrasse 1, 64291 Darmstadt (Germany); Johannes Gutenberg-Universität Mainz, J.J. Becherweg 40, 55099 Mainz (Germany); Bianchin, S. [GSI Helmholtz Centre for Heavy Ion Research, Planckstrasse 1, 64291 Darmstadt (Germany); Bozkurt, V. [GSI Helmholtz Centre for Heavy Ion Research, Planckstrasse 1, 64291 Darmstadt (Germany); Nigde University, 51100 Nigde (Turkey); Kavatsyuk, M. [KVI, University of Groningen, Zernikelaan 25, NL-9747 AA Groningen (Netherlands); Ma, Y. [GSI Helmholtz Centre for Heavy Ion Research, Planckstrasse 1, 64291 Darmstadt (Germany); Johannes Gutenberg-Universität Mainz, J.J. Becherweg 40, 55099 Mainz (Germany); Maas, F. [GSI Helmholtz Centre for Heavy Ion Research, Planckstrasse 1, 64291 Darmstadt (Germany); Johannes Gutenberg-Universität Mainz, J.J. Becherweg 40, 55099 Mainz (Germany); The Helmholtz Institute Mainz (HIM), J.J. Becherweg 40, 55099 Mainz (Germany); and others

    2013-09-02

    A novel experiment, aiming at demonstrating the feasibility of hypernuclear spectroscopy with heavy ion beams, was conducted. Using the invariant mass method, the spectroscopy of hypernuclear products of {sup 6}Li projectiles on a carbon target at 2A GeV was performed. Signals of the Λ-hyperon and {sup 3}{sub Λ}H and {sup 4}{sub Λ}H hypernuclei were observed for final states of p+π{sup −}, {sup 3}He+π{sup −} and {sup 4}He+π{sup −}, respectively, with significance values of 6.7, 4.7 and 4.9σ. By analyzing the proper decay time from secondary vertex distribution with the unbinned maximum likelihood fitting method, their lifetime values were deduced to be 262{sub −43}{sup +56}±45 ps for Λ, 183{sub −32}{sup +42}±37 ps for {sup 3}{sub Λ}H, and 140{sub −33}{sup +48}±35 ps for {sup 4}{sub Λ}H.

  3. Improved neutron-gamma discrimination for a {sup 6}Li-glass neutron detector using digital signal analysis methods

    Energy Technology Data Exchange (ETDEWEB)

    Wang, C. L., E-mail: wangc@ornl.gov; Riedel, R. A. [Instrument and Source Division, Neutron Sciences Directorate, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831 (United States)

    2016-01-15

    A {sup 6}Li-glass scintillator (GS20) based neutron Anger camera was developed for time-of-flight single-crystal diffraction instruments at Spallation Neutron Source. Traditional Pulse-Height Analysis (PHA) for Neutron-Gamma Discrimination (NGD) resulted in the neutron-gamma efficiency ratio (defined as NGD ratio) on the order of 10{sup 4}. The NGD ratios of Anger cameras need to be improved for broader applications including neutron reflectometers. For this purpose, six digital signal analysis methods of individual waveforms acquired from photomultiplier tubes were proposed using (i) charge integration, (ii) pulse-amplitude histograms, (iii) power spectrum analysis combined with the maximum pulse-amplitude, (iv) two event parameters (a{sub 1}, b{sub 0}) obtained from a Wiener filter, (v) an effective amplitude (m) obtained from an adaptive least-mean-square filter, and (vi) a cross-correlation coefficient between individual and reference waveforms. The NGD ratios are about 70 times those from the traditional PHA method. Our results indicate the NGD capabilities of neutron Anger cameras based on GS20 scintillators can be significantly improved with digital signal analysis methods.

  4. Spectroscopic strengths for /sup 6/Li-induced alpha-particle transfers on /sup 18/O at 72 MeV

    Energy Technology Data Exchange (ETDEWEB)

    Tanabe, T.; Ogino, K.; Kadota, Y.; Haga, K.; Kitahara, T.; Shiba, T.

    1982-08-01

    The /sup 18/O(/sup 6/Li,d)/sup 22/Ne reaction has been studied at 72-MeV bombarding energy. The angular distributions for transitions to low-lying states in /sup 22/Ne are fitted by exact finite-range distorted-wave Born approximation calculations and yield relative spectroscopic factors in good agreement with theoretical predictions.

  5. Effects of t- and α-transfer on the spectroscopic information from the {sup 6}Li({sup 3}He,d){sup 7}Be reaction

    Energy Technology Data Exchange (ETDEWEB)

    Burtebayev, N., E-mail: nburtebayev@yandex.ru [Institute of Nuclear Physics of National Nuclear Center, 480082, Almaty, Ibragimova str. 1 (Kazakhstan); Burtebayeva, J.T.; Glushchenko, N.V.; Kerimkulov, Zh.K. [Institute of Nuclear Physics of National Nuclear Center, 480082, Almaty, Ibragimova str. 1 (Kazakhstan); Amar, A. [Al-Farabi Kazakh National University, 480078, Almaty, al-Farabi ave. 71 (Kazakhstan); Tanta University, Faculty of Science, Physics Department, Tanta (Egypt); Nassurlla, M. [Al-Farabi Kazakh National University, 480078, Almaty, al-Farabi ave. 71 (Kazakhstan); Sakuta, S.B. [National Research Center “Kurchatov Institute”, Kurchatov Sq. 1, 123182 Moscow (Russian Federation); Artemov, S.V.; Igamov, S.B.; Karakhodzhaev, A.A. [Institute of Nuclear Physics, Tashkent, Avliyo Ota str. 61 (Uzbekistan); Rusek, K. [Heavy Ion Laboratory of Warsaw University, ul. L. Pasteura 5A, PL-02-093 Warsaw (Poland); Kliczewski, S. [H. Niewodniczański Institute of Nuclear Physics, Polish Academy of Sciences, ul. Radzikowskiego 152, PL-31-342 Cracow (Poland)

    2013-07-01

    Angular distributions of differential cross sections have been measured for elastic, inelastic scattering and the ({sup 3}He,d) reaction on {sup 6}Li nuclei at the E{sub lab}({sup 3}He)=34 MeV energy. The new and early obtained elastic scattering data at 34, 50, 60 and 72 MeV have been analyzed with Coupled Reaction Channels Method (CRC) taking into account triton transfer mechanism. The spectroscopic factors for t+{sup 3}He configuration of {sup 6}Li were extracted. Parameters for real part of potential have been also calculated microscopically with double folding model. The differential cross sections for proton stripping to the {sup 7}Be ground and first excited states have been analyzed by modified DWBA and CRC methods at 34 MeV. The effect of triton and α exchange on proton transfer reaction {sup 6}Li({sup 3}He,d){sup 7}Be for both ground and excited state is discussed. Spectroscopic factors and asymptotical normalization coefficients for p+{sup 6}Li configuration of {sup 7}Be have been obtained from the experimental data.

  6. Novel 4{pi} Detection System for the Measurement of the {sup 6}Li(n,{alpha}){sup 3}H Reaction Cross Section

    Energy Technology Data Exchange (ETDEWEB)

    Giorginis, Georgios; Bencardino, Raffaele [European Commission, Joint Research Centre, Institute for Reference Materials and Measurements (IRMM), Retieseweg 111, B-2440 Geel (Belgium)

    2011-12-13

    A dedicated one-dimensional Time Projection Chamber (1D-TPC) was designed and produced at IRMM to determine the {sup 6}Li(n,{alpha}){sup 3}H cross section in the 0.4-2.8 MeV energy range, aiming at 5% accuracy. The basic TPC components were a twin gridded ionisation chamber (GIC) with interwired electrodes and fast digitisation of the anode and cathode signals. The energy of both reaction products emitted from a thin {sup 6}LiF sample at the common TPC cathode was measured. A Kr(97%)CO{sub 2}(3%) mixture was used as the detector gas at a pressure up to 3.5 bar. A {sup 238}U sample mounted on the cathode of an ionisation chamber without grid was used as the neutron flux monitor. Special care was taken to reduce the experimental sources of uncertainty. The beam-monitor {sup 238}U sample was characterised at IRMM by low-geometry {alpha}-counting with an accuracy of 0.1%. A {sup 6}Li sample was produced at IRMM by vacuum evaporation of {sup 6}LiF onto transparent aluminium backing. The number of {sup 6}Li atoms will be measured via Thermal Neutron Depth Profiling with an expected accuracy of 2% with respect to an IRMM Standard Reference Material. First test measurements were performed using a monoenergetic neutron beam produced by the T(p,n){sup 3}He reaction at the IRMM 7 MV Van de Graaff accelerator. The experimental method and preliminary results are presented.

  7. Functions of MgH2 in hydrogen storage reactions of the 6LiBH4-CaH2 reactive hydride composite.

    Science.gov (United States)

    Zhou, Yifan; Liu, Yongfeng; Zhang, Yu; Gao, Mingxia; Pan, Hongge

    2012-08-28

    A significant improvement of hydrogen storage properties was achieved by introducing MgH(2) into the 6LiBH(4)-CaH(2) system. It was found that ~8.0 wt% of hydrogen could be reversibly stored in a 6LiBH(4)-CaH(2)-3MgH(2) composite below 400 °C and 100 bar of hydrogen pressure with a stepwise reaction, which is superior to the pristine 6LiBH(4)-CaH(2) and LiBH(4) samples. Upon dehydriding, MgH(2) first decomposed to convert to Mg and liberate hydrogen with an on-set temperature of ~290 °C. Subsequently, LiBH(4) reacted with CaH(2) to form CaB(6) and LiH in addition to further hydrogen release. Hydrogen desorption from the 6LiBH(4)-CaH(2)-3MgH(2) composite finished at ~430 °C in non-isothermal model, a 160 °C reduction relative to the 6LiBH(4)-CaH(2) sample. JMA analyses revealed that hydrogen desorption was a diffusion-controlled reaction rather than an interface reaction-controlled process. The newly produced Mg of the first-step dehydrogenation possibly acts as the heterogeneous nucleation center of the resultant products of the second-step dehydrogenation, which diminishes the energy barrier and facilitates nucleation and growth, consequently reducing the operating temperature and improving the kinetics of hydrogen storage.

  8. Characterization of {sup 6}LiF:Mg,Cu,P (TLD-600 H) estimate of E, b and s parameters

    Energy Technology Data Exchange (ETDEWEB)

    Andres, P. A., E-mail: andresp@cab.cnea.gov.ar [Centro Atomico Bariloche, Division Proteccion Radiologica / CNEA, Av. E. Bustillo Km 9.5, R8402AGP San Carlos de Bariloche (Argentina)

    2015-10-15

    LiF:Mg,Cu,P dosemeters are useful for low-dose measurements because of its high sensitivity compared to the LiF:Mg,Ti dosemeters. {sup 7}LiF:Mg,Cu,P have been used for environmental dosimetry in Bariloche Atomic Centre for almost a decade. Since {sup 6}LiF:Mg,Cu,P dosemeters were intended to be used for X ray diagnosis dosimetry in neonatology, they had to be characterized first. The main goal of measuring and analyzing Tl glow curves is the extraction of some parameters that can be used to describe the Tl process in the material. This job focused on the estimation of the activation energy E for the Tl traps, the frequency factor s and the order of kinetics b of the Tl process. Furthermore, the most appropriate time-temperature profile (Ttp) was determined as well as the annealing temperature and time, which resulted being 240 degrees C for 10 minutes. The Ttp used was 140 degrees C for 10 seconds, a heating rate of 20/s until 240 degrees C, remaining at this temperature for 20 seconds, and then an exponential cooling until 50 degrees C. After applying the whole glow-peak method for different orders of kinetic, and the Kitis equation assuming a first order kinetics, the values obtained were: E = (1.066 ± 0.025) eV, as a weighted average of both methods, and a frequency factor s = (3.57 ± 1.56) E-10 s{sup -1} again as a weighted average of both methods. In both cases a first order kinetics (b = 1) was assumed. The dosemeters were irradiated with a calibrated {sup 137}Cs source and read with a Harshaw TLD{sup TM} Model 3500 reader resulting in a minimum detectable dose of about 20 μGy. (Author)

  9. Upgrade of the POLDI diffractometer with a ZnS(Ag)/6LiF scintillation detector read out with WLS fibers coupled to SiPMs

    OpenAIRE

    Mosset, J. -B.; Stoykov, A.; Davydov, V.; Hildebrandt, M.; Van Swygenhoven, H.; W. Wagner

    2013-01-01

    A thermal neutron detector based on ZnS(Ag)/6LiF scintillator, wavelength-shifting fibers (WLS) and silicon photomultipliers (SiPM) is under development at the Paul Scherrer Institute (PSI) for upgrading the POLDI instrument, a pulse-overlap diffractometer. The design of the detector is outlined, and the measurements performed on a single channel prototype are presented. An innovative signal processing system based on a photon counting approach is under development. Its principle of operation...

  10. Characteristics of a thermal neutrons scintillation detector with the [ZnS(Ag)+$^6$LiF] at different conditions of measurements

    OpenAIRE

    Alekseenko, V. V.; Barabanov, I. R.; Etezov, R. A.; Gavrilyuk, Yu. M.; Gangapshev, A. M.; Gezhaev, A. M.; Kazalov, V. V.; Khokonov, A. Kh.; V.V. Kuzminov; Panasenko, S. I.; Ratkevich, S. S.

    2015-01-01

    A construction of a thermal neutron testing detector with a thin [ZnS(Ag)+$^6$LiF] scintillator is described. Results of an investigation of sources of the detector pulse origin and the pulse features in a ground and underground conditions are presented. Measurements of the scintillator own background, registration efficiency and a neutron flux at different objects of the BNO INR RAS were performed. The results are compared with the ones measured by the $^3$He proportional counter.

  11. Ultracold neutron detection with {sup 6}Li-doped glass scintillators. NANOSC: A fast ultracold neutron detector for the nEDM experiment at the Paul Scherrer Institute

    Energy Technology Data Exchange (ETDEWEB)

    Ban, G.; Lefort, T.; Lemiere, Y.; Naviliat-Cuncic, O.; Pierre, E.; Quemener, G.; Rogel, G. [Normandie Univ, ENSICAEN, UNICAEN, CNRS/IN2P3, LPC Caen, Caen (France); Bison, G.; Chowdhuri, Z.; Henneck, R.; Lauss, B.; Mtchedlishvili, A.; Schmidt-Wellenburg, P.; Zsigmond, G. [Paul Scherrer Institute, Villigen-PSI (Switzerland); Bodek, K.; Zejma, J. [Jagiellonian University, Marian Smoluchowski Institute of Physics, Cracow (Poland); Geltenbort, P. [Institut Laue-Langevin, Grenoble (France); Griffith, W.C.; Musgrave, M. [University of Sussex, Falmer, Department of Physics and Astronomy, Brighton (United Kingdom); Helaine, V. [Normandie Univ, ENSICAEN, UNICAEN, CNRS/IN2P3, LPC Caen, Caen (France); Paul Scherrer Institute, Villigen-PSI (Switzerland); Kasprzak, M.; Koss, P.A.; Severijns, N.; Wursten, E. [Katholieke Universiteit Leuven, Instituut voor Kernen Stralingsfysica, Leuven (Belgium); Kermaidic, Y.; Pignol, G.; Rebreyend, D. [LPSC, Universite Grenoble Alpes, CNRS/IN2P3, Grenoble (France); Kirch, K.; Komposch, S.; Krempel, J.; Ries, D. [Paul Scherrer Institute, Villigen-PSI (Switzerland); Institute for Particle Physics, ETH Zuerich, Zuerich (Switzerland); Kozela, A. [Henryk Niedwodniczanski Institute for Nuclear Physics, Cracow (Poland); Piegsa, F.M.; Rawlik, M. [Institute for Particle Physics, ETH Zuerich, Zuerich (Switzerland); Roccia, S. [CSNSM, Universite Paris Sud, CNRS/IN2P3, Orsay (France)

    2016-10-15

    This paper summarizes the results from measurements aiming to characterize ultracold neutron detection with {sup 6}Li-doped glass scintillators. Single GS10 or GS20 scintillators, with a thickness of 100-200μm, fulfill the ultracold neutron detection requirements with an acceptable neutron-gamma discrimination. This discrimination is clearly improved with a stack of two scintillators: a {sup 6}Li-depleted glass bonded to a {sup 6}Li-enriched glass. The technique of optical contact bonding is used between the two glasses in order to eliminate the need for optical glue or grease between them. Relative to a {sup 3}He Strelkov gas detector, the scintillator's detection efficiency is lower for UCN energies close to the scintillator's Fermi potential (85-100 neV), but becomes larger at higher UCN energies. Coupled to a digital data acquisition system, counting rates up to a few 10{sup 5} counts/s can be handled. A detector based on such a scintillator stack arrangement was built and has been used in the neutron electric dipole moment experiment at the Paul Scherrer Institute since 2010. Its response for routine runs of the neutron electric dipole moment experiment is presented. (orig.)

  12. Ultracold neutron detection with 6Li-doped glass scintillators, NANOSC: a fast ultracold neutron detector for the nEDM experiment at the Paul Scherrer Institute

    CERN Document Server

    Ban, G; Bodek, K; Chowdhuri, Z; Geltenbort, P; Griffith, W C; Hélaine, V; Henneck, R; Kasprzak, M; Kermaidic, Y; Kirch, K; Komposch, S; Koss, P A; Kozela, A; Krempel, J; Lauss, B; Lefort, T; Lemière, Y; Mtchedlishvili, A; Musgrave, M; Naviliat-Cuncic, O; Piegsa, F M; Pierre, E; Pignol, G; Quéméner, G; Rawlik, M; Ries, D; Rebreyend, D; Roccia, S; Rogel, G; Schmidt-Wellenburg, P; Severijns, N; Wursten, E; Zejma, J; Zsigmond, G

    2016-01-01

    This paper summarizes the results from measurements aiming to characterize ultracold neutron detection with 6Li-doped glass scintillators. Single GS10 or GS20 scintillators, with a thickness of 100-200 micrometer, fulfill the ultracold neutron detection requirements with an acceptable neutron-gamma discrimination. This discrimination is clearly improved with a stack of two scintillators: a 6Li-depleted glass bonded to a 6Li-enriched glass. The optical contact bonding is used between the scintillators in order to obtain a perfect optical contact. The scintillator's detection efficiency is similar to that of a 3He Strelkov gas detector. Coupled to a digital data acquisition system, counting rates up to a few 10^5 counts/s can be handled. A detector based on such a scintillator stack arrangement was built and has been used in the neutron electric dipole moment experiment at the Paul Scherrer Institute since 2010. Its response for the regular runs of the neutron electric dipole moment experiment is presented.

  13. Ultracold neutron detection with 6Li-doped glass scintillators. NANOSC: A fast ultracold neutron detector for the nEDM experiment at the Paul Scherrer Institute

    Science.gov (United States)

    Ban, G.; Bison, G.; Bodek, K.; Chowdhuri, Z.; Geltenbort, P.; Griffith, W. C.; Hélaine, V.; Henneck, R.; Kasprzak, M.; Kermaidic, Y.; Kirch, K.; Komposch, S.; Koss, P. A.; Kozela, A.; Krempel, J.; Lauss, B.; Lefort, T.; Lemière, Y.; Mtchedlishvili, A.; Musgrave, M.; Naviliat-Cuncic, O.; Piegsa, F. M.; Pierre, E.; Pignol, G.; Quéméner, G.; Rawlik, M.; Ries, D.; Rebreyend, D.; Roccia, S.; Rogel, G.; Schmidt-Wellenburg, P.; Severijns, N.; Wursten, E.; Zejma, J.; Zsigmond, G.

    2016-10-01

    This paper summarizes the results from measurements aiming to characterize ultracold neutron detection with 6Li-doped glass scintillators. Single GS10 or GS20 scintillators, with a thickness of 100-200μm, fulfill the ultracold neutron detection requirements with an acceptable neutron-gamma discrimination. This discrimination is clearly improved with a stack of two scintillators: a 6Li-depleted glass bonded to a 6Li-enriched glass. The technique of optical contact bonding is used between the two glasses in order to eliminate the need for optical glue or grease between them. Relative to a 3He Strelkov gas detector, the scintillator's detection efficiency is lower for UCN energies close to the scintillator's Fermi potential (85-100 neV), but becomes larger at higher UCN energies. Coupled to a digital data acquisition system, counting rates up to a few 105 counts/s can be handled. A detector based on such a scintillator stack arrangement was built and has been used in the neutron electric dipole moment experiment at the Paul Scherrer Institute since 2010. Its response for routine runs of the neutron electric dipole moment experiment is presented.

  14. Bare astrophysical S(E)-factor for the {sup 6}Li(d, {alpha}){sup 4}He and {sup 7}Li(p, {alpha}){sup 4}He reactions at astrophysical energies

    Energy Technology Data Exchange (ETDEWEB)

    Pizzone, R.G.; Spitaleri, C.; Lattuada, M.; Musumarra, A.; Pellegriti, M.G.; Romano, S.; Tumino, A.; Cherubini, S.; Figuera, P.; Miljanic, D.; Rolfs, C.; Typel, S.; Wolter, H.H.; Castellani, V.; Degl' Innocenti, S.; Imperio, A

    2003-05-05

    The Trojan Horse Method has been applied to study the {sup 7}Li(p, {alpha}){sup 4}He and {sup 6}(Li(d, {alpha}){sup 4}He reactions through the {sup 7}Li(d, {alpha}{alpha})n and {sup 6}Li({sup 6}Li, {alpha}{alpha}){sup 4}He three body processes, respectively. The electron screening potential deduced from these experiments is much larger than the adiabatic approximation prediction for both cases; the systematic discrepancy between data and theoretical predictions is thus confirmed. Astrophysical implications of these measurements are also discussed.

  15. $\\Sigma^- p$ emission rates in $K^-$ absorptions at rest on $^6$Li, $^7$Li, $^{9}$Be, $^{13}$C and $^{16}$O

    CERN Document Server

    Agnello, M; Bertani, M; Bonomi, G; Botta, E; Bregant, M; Bressani, T; Bufalino, S; Busso, L; Calvo, D; Camerini, P; Dalena, B; De Mori, F; D'Erasmo, G; Feliciello, A; Filippi, A; Fiore, E M; Fontana, A; Fujioka, H; Genova, P; Gianotti, P; Grion, N; Lucherini, V; Marcello, S; Morra, O; Nagae, T; Outa, H; Pantaleo, A; Paticchio, V; Piano, S; Rui, R; Simonetti, G; Wheadon, R; Zenoni, A

    2015-01-01

    An experimental study of the $K^-_{stop}A\\rightarrow \\Sigma^- p A'$ reaction on $A=^6$Li, $^7$Li, $^9$Be, $^{13}$C and $^{16}$O $p$-shell nuclei is presented. The data were collected by the FINUDA spectrometer operating at the DA$\\Phi$NE $\\phi$-factory (LNF-INFN, Italy). Emission rates for the reaction in the mentioned nuclei are measured and compared with the few existing data. The spectra of several observables are discussed; indications of Quasi-Free absorptions by a $(np)$ pair embedded in the $A$ nucleus can be obtained from the study of the missing mass distributions.

  16. All-optical production of dual Bose-Einstein condensates of paired fermions and bosons with 6Li and 7Li

    Science.gov (United States)

    Ikemachi, Takuya; Ito, Aki; Aratake, Yukihito; Chen, Yiping; Koashi, Masato; Kuwata-Gonokami, Makoto; Horikoshi, Munekazu

    2017-01-01

    We report the first all-optical production of dual Bose-Einstein condensates (BECs) of paired 6Li (fermion) and one spin state of 7Li (boson) at the magnetic field where the s-wave interactions between fermions are resonant. Fermions are cooled efficiently by evaporative cooling and they serve as coolant for bosons. As a result, the dual condensates can be achieved by using a simple experimental apparatus and procedures, as in the case of the all-optical production of a single BEC. We show that the all-optical method enables us to realize variety of ultracold Bose-Fermi mixtures.

  17. Breakup coupling effects on near-barrier inelastic scattering of the weakly bound {sup 6}Li projectile on a {sup 144}Sm target

    Energy Technology Data Exchange (ETDEWEB)

    Woodard, A.E., E-mail: awoodard@nd.edu [Laboratorio Tandar, Comision Nacional de Energia Atomica, B1650KNA San Martin, Buenos Aires (Argentina); Figueira, J.M. [Laboratorio Tandar, Comision Nacional de Energia Atomica, B1650KNA San Martin, Buenos Aires (Argentina); Consejo Nacional de Investigaciones Cientificas y Tecnicas, C1033AAJ Ciudad de Buenos Aires (Argentina); Otomar, D.R. [Instituto de Fisica, Universidade Federal Fluminense, Gragoata, Niteroi, R. J., 24210-340 (Brazil); Fernandez Niello, J.O. [Laboratorio Tandar, Comision Nacional de Energia Atomica, B1650KNA San Martin, Buenos Aires (Argentina); Consejo Nacional de Investigaciones Cientificas y Tecnicas, C1033AAJ Ciudad de Buenos Aires (Argentina); Escuela de Ciencia y Tecnologia, Universidad de San Martin, B1650BWA San Martin, Buenos Aires (Argentina); Lubian, J. [Instituto de Fisica, Universidade Federal Fluminense, Gragoata, Niteroi, R. J., 24210-340 (Brazil)

    2012-01-01

    Angular distributions for the inelastic scattering of the weakly bound {sup 6}Li nucleus from a {sup 144}Sm target (associated with the contributions of both the 2{sub 1}{sup +} and 3{sub 1}{sup -144}Sm excited states together) were measured at bombarding energies close to the Coulomb barrier. The experimental data were compared with expected results based on continuum discretized coupled-channel (CDCC) calculations. The results confirm that it is essential to include continuum-continuum couplings to reproduce the experimental data. The analysis demonstrates that inelastic scattering data can be a critical tool in testing full CDCC calculations involving weakly bound nuclei.

  18. Cross-section measurements for {sup 239}Pu(n,f) and {sup 6}Li(n,{alpha}) with a lead slowing-down spectrometer

    Energy Technology Data Exchange (ETDEWEB)

    Rochman, D. [National Nuclear Data Center, Brookhaven National Laboratory, Upton, NY 11973-5000 (United States)]. E-mail: drochman@bnl.gov; Haight, R.C. [Los Alamos National Laboratory, Los Alamos, NM 87545 (United States)]. E-mail: haight@lanl.gov; O' Donnell, J.M. [Los Alamos National Laboratory, Los Alamos, NM 87545 (United States)]. E-mail: odonnell@lanl.gov; Wender, S.A. [Los Alamos National Laboratory, Los Alamos, NM 87545 (United States)]. E-mail: wender@lanl.gov; Vieira, D.J. [Los Alamos National Laboratory, Los Alamos, NM 87545 (United States)]. E-mail: vieira@lanl.gov; Bond, E.M. [Los Alamos National Laboratory, Los Alamos, NM 87545 (United States)]. E-mail: bond@lanl.gov; Bredeweg, T.A. [Los Alamos National Laboratory, Los Alamos, NM 87545 (United States)]. E-mail: toddb@lanl.gov; Wilhelmy, J.B. [Los Alamos National Laboratory, Los Alamos, NM 87545 (United States)]. E-mail: j_wilhelmy@lanl.gov; Granier, T. [Commissariat a l' Energie Atomique, 91680 Bruyeres-le-Chatel (France)]. E-mail: granier@cea.fr; Ethvignot, T. [Commissariat a l' Energie Atomique, 91680 Bruyeres-le-Chatel (France)]. E-mail: ethvignot@cea.fr; Petit, M. [Commissariat a l' Energie Atomique, 91680 Bruyeres-le-Chatel (France)]. E-mail: petit@cea.fr; Danon, Y. [Rensselaer Polytechnic Institute, Troy, NY 12180 (United States)]. E-mail: danony@rpi.edu; Romano, C. [Rensselaer Polytechnic Institute, Troy, NY 12180 (United States)]. E-mail: romanc2@rpi.edu

    2006-08-01

    We present fission cross-section measurements with {approx}10ng of {sup 239}Pu performed using the LANSCE Lead Slowing-Down Spectrometer. Results of Li6(n,{alpha}) measurements with a sample size of 760ng of {sup 6}Li are also reported. This technical achievement demonstrates the feasibility of measuring neutron-induced fission cross-section on samples with 10ng of fissile actinides that are available on ultra-small quantities. Furthermore, results on neutron-induced alpha emission show that measurements for astrophysics purposes are feasible with the LSDS.

  19. Cross-section measurements for 239Pu(n,f) and 6Li(n, α) with a lead slowing-down spectrometer

    Science.gov (United States)

    Rochman, D.; Haight, R. C.; O'Donnell, J. M.; Wender, S. A.; Vieira, D. J.; Bond, E. M.; Bredeweg, T. A.; Wilhelmy, J. B.; Granier, T.; Ethvignot, T.; Petit, M.; Danon, Y.; Romano, C.

    2006-08-01

    We present fission cross-section measurements with ˜10 ng of 239Pu performed using the LANSCE Lead Slowing-Down Spectrometer. Results of Li6(n,α) measurements with a sample size of 760 ng of 6Li are also reported. This technical achievement demonstrates the feasibility of measuring neutron-induced fission cross-section on samples with 10 ng of fissile actinides that are available on ultra-small quantities. Furthermore, results on neutron-induced alpha emission show that measurements for astrophysics purposes are feasible with the LSDS.

  20. Search for $^6_\\Lambda$H hypernucleus by the $^6$Li$(\\pi^-,K^+)$ reaction at $p_{\\pi^-}$ = 1.2 GeV/$c$

    CERN Document Server

    Sugimura, H; Ahn, J K; Ajimura, S; Akazawa, Y; Amano, N; Aoki, K; Bhang, H C; Chiga, N; Endo, M; Evtoukhovitch, P; Feliciello, A; Fujioka, H; Fukuda, T; Hasegawa, S; Hayakawa, S; Honda, R; Hosomi, K; Hwang, S H; Ichikawa, Y; Igarashi, Y; Imai, K; Ishibashi, N; Iwasaki, R; Joo, C W; Kiuchi, R; Lee, J K; Lee, J Y; Matsuda, K; Matsumoto, Y; Matsuoka, K; Miwa, K; Mizoi, Y; Moritsu, M; Nagae, T; Nagamiya, S; Nakagawa, M; Naruki, M; Noumi, H; Ota, R; Roy, B J; Saha, P K; Sakaguchi, A; Sako, H; Samanta, C; Samoilov, V; Sasaki, Y; Sato, S; Sekimoto, M; Shimizu, Y; Shiozaki, T; Shirotori, K; Soyama, T; Takahashi, T; Takahashi, T N; Tamura, H; Tanabe, K; Tanaka, T; Tanida, K; Tokiyasu, A O; Tsamalaidze, Z; Ukai, M; Yamamoto, T O; Yamamoto, Y; Yang, S B; Yoshida, K

    2014-01-01

    We have carried out an experiment to search for a neutron-rich hypernucleus, $^6_{\\Lambda}$H, by the $^6$Li($\\pi^-,K^+$) reaction at $p_{\\pi^-}$ =1.2 GeV/$c$. The obtained missing mass spectrum with an estimated energy resolution of 3.2 MeV (FWHM) showed no peak structure corresponding to the $^6_{\\Lambda}$H hypernucleus neither below nor above the $^4_{\\Lambda}$H$+2n$ particle decay threshold. An upper limit of the production cross section for the bound $^6_{\\Lambda}$H hypernucleus was estimated to be 1.2 nb/sr at 90% confidence level.

  1. Measurements of double-differential neutron emission cross sections of {sup 6}Li and {sup 7}Li for 18 MeV neutrons

    Energy Technology Data Exchange (ETDEWEB)

    Ibaraki, Masanobu; Baba, Mamoru; Matsuyama, Shigeo; Sanami, Toshiya; Win, T.; Miura, Takako; Hirakawa, Naohiro [Tohoku Univ., Sendai (Japan). Faculty of Engineering

    1997-03-01

    Double-differential neutron emission cross sections of {sup 6}Li and {sup 7}Li were measured for 18 MeV neutrons at Tohoku University 4.5 MV Dynamitron facility. Neutron emission spectra were obtained down to 1 MeV at 13 angles with energy resolution good enough to separate discrete levels. A care was taken to eliminate the sample-dependent background due to parasitic neutrons. Experimental results were in fair agreement with the JENDL-3.2 data and a simple model considering a three-body breakup process and discrete level excitations. (author)

  2. Digital signal processing for a thermal neutron detector using ZnS(Ag):6LiF scintillating layers read out with WLS fibers and SiPMs

    OpenAIRE

    Mosset, J. -B.; Stoykov, A.; Greuter, U.; Hildebrandt, M.; Schlumpf, N.

    2015-01-01

    We present a digital signal processing system based on a photon counting approach which we developed for a thermal neutron detector consisting of ZnS(Ag):6LiF scintillating layers read out with WLS fibers and SiPMs. Three digital filters have been evaluated: a moving sum, a moving sum after differentiation and a digital CR-RC^4 filter. The performances of the detector with these filters are presented. A full analog signal processing using a CR-RC^4 filter has been emulated digitally. The dete...

  3. Digital signal processing for a thermal neutron detector using ZnS(Ag):6LiF scintillating layers read out with WLS fibers and SiPMs

    Science.gov (United States)

    Mosset, J.-B.; Stoykov, A.; Greuter, U.; Hildebrandt, M.; Schlumpf, N.

    2016-07-01

    We present a digital signal processing system based on a photon counting approach which we developed for a thermal neutron detector consisting of ZnS(Ag):6LiF scintillating layers read out with WLS fibers and SiPMs. Three digital filters have been evaluated: a moving sum, a moving sum after differentiation and a digital CR-RC4 filter. The performances of the detector with these filters are presented. A full analog signal processing using a CR-RC4 filter has been emulated digitally. The detector performance obtained with this analog approach is compared with the one obtained with the best performing digital approach.

  4. Digital signal processing for a thermal neutron detector using ZnS(Ag):6LiF scintillating layers read out with WLS fibers and SiPMs

    CERN Document Server

    Mosset, J -B; Greuter, U; Hildebrandt, M; Schlumpf, N

    2015-01-01

    We present a digital signal processing system based on a photon counting approach which we developed for a thermal neutron detector consisting of ZnS(Ag):6LiF scintillating layers read out with WLS fibers and SiPMs. Three digital filters have been evaluated: a moving sum, a moving sum after differentiation and a digital CR-RC^4 filter. The performances of the detector with these filters are presented. A full analog signal processing using a CR-RC^4 filter has been emulated digitally. The detector performance obtained with this analog approach is compared with the one obtained with the best performing digital approach.

  5. Measurement of differential cross sections and cross sections of the 6Li(n, t)4He reaction in the 1-2MeV energy range%1-2 MeV能区6Li(n,t)4He反应微分截面与截面的实验测量

    Institute of Scientific and Technical Information of China (English)

    张国辉; 陈金象; 唐国有; Gledenov Yu M; Sedysheva M; Khuukhenkhuu G

    2006-01-01

    利用屏栅电离室对1.05、1.54及2.25 MeV中子6Li(n,t)4He反应的微分截面与截面进行了实验测量.采用氚固体靶的T(p,n)3He反应产生准单能中子,用相对效率已知的BF3长中子管和238U裂变片相结合来测定绝对中子通量.将测量结果与已有数据进行了比较,1-2 MeV能区6Li(n,t)4He反应截面的分歧在一定程度上得到了澄清.

  6. Natural Abundance 17O, 6Li NMR and Molecular Modeling Studies of the Solvation Structures of Lithium bis(fluorosulfonyl)imide/1,2-dimethoxyethane Liquid Electrolytes

    Energy Technology Data Exchange (ETDEWEB)

    Wan, Chuan; Hu, Mary Y.; Borodin, Oleg; Qian, Jiangfeng; Qin, Zhaohai; Zhang, Jiguang; Hu, Jian Z.

    2016-03-01

    Natural abundance 17O and 6Li NMR experiments, quantum chemistry and molecular dynamics studies were employed to investigate the solvation structures of Li+ at various concentrations of LiFSI in DME electrolytes in an effort to solve this puzzle. It was found that the chemical shifts of both 17O and 6Li changed with the concentration of LiFSI, indicating the changes of solvation structures with concentration. For the quantum chemistry calculations, the coordinated cluster LiFSI(DME)2 forms at first, and its relative ratio increases with increasing LiFSI concentration to 1 M. Then the solvation structure LiFSI(DME) become the dominant component. As a result, the coordination of forming contact ion pairs between Li+ and FSI- ion increases, but the association between Li+ and DME molecule decreases. Furthermore, at LiFSI concentration of 4 M the solvation structures associated with Li+(FSI-)2(DME), Li+2(FSI-)(DME)4 and (LiFSI)2(DME)3 become the dominant components. For the molecular dynamics simulation, with increasing concentration, the association between DME and Li+ decreases, and the coordinated number of FSI- increases, which is in perfect accord with the DFT results. These results provide more insight on the fundamental mechanism on the very high CE of Li deposition in these electrolytes, especially at high current density conditions.

  7. Simultaneous sub-Doppler laser cooling of fermionic $^6$Li and $^{40}$K on the D$_1$ line: Theory and Experiment

    CERN Document Server

    Sievers, Franz; Kretzschmar, Norman; Fernandes, Diogo Rio; Suchet, Daniel; Rabinovic, Michael; Parker, Colin V; Khaykovich, Lev; Salomon, Christophe; Chevy, Frédéric

    2014-01-01

    We report on simultaneous sub-Doppler laser cooling of fermionic $^6$Li and $^{40}$K using the D$_1$ optical transitions. We compare experimental results to a numerical simulation of the cooling process applying a semi-classical Monte Carlo wavefunction method. The simulation takes into account the three dimensional optical molasses setup and the dipole interaction between atoms and the bichromatic light field driving the D$_1$ transitions. We discuss the physical mechanisms at play, we identify the important role of coherences between the ground state hyperfine levels and compare D$_1$ and D$_2$ sub-Doppler cooling. In 5 ms, the D$_1$ molasses phase largely reduces the temperature for both $^6$Li and $^{40}$K at the same time, with a final temperature of 44 $\\mu$K and 11 $\\mu$K, respectively. For both species this leads to a phase-space density close to $10^{-4}$. These conditions are well suited to directly load an optical or magnetic trap for efficient evaporative cooling to quantum degeneracy.

  8. Parsec-scale Variations in the 7Li i/6Li i Isotope Ratio Toward IC 348 and the Perseus OB 2 Association

    Science.gov (United States)

    Knauth, D. C.; Taylor, C. J.; Ritchey, A. M.; Federman, S. R.; Lambert, D. L.

    2017-01-01

    Measurements of the lithium isotopic ratio in the diffuse interstellar medium from high-resolution spectra of the Li i λ6708 resonance doublet have now been reported for a number of lines of sight. The majority of the results for the 7Li/6Li ratio are similar to the solar system ratio of 12.2, but the line of sight toward o Per, a star near the star-forming region IC 348, gave a ratio of about two, the expected value for gas exposed to spallation and fusion reactions driven by cosmic rays. To examine the association of IC 348 with cosmic rays more closely, we measured the lithium isotopic ratio for lines of sight to three stars within a few parsecs of o Per. One star, HD 281159, has 7Li/6Li ≃ 2 confirming production by cosmic rays. The lithium isotopic ratio toward o Per and HD 281159 together with published analyses of the chemistry of interstellar diatomic molecules suggest that the superbubble surrounding IC 348 is the source of the cosmic rays. Based on observations obtained with the Hobby-Eberly Telescope, which is a joint project of the University of Texas at Austin, the Pennsylvania State University, Ludwig-Maximilians-Universität München, and Georg-August-Universität Göttingen.

  9. An ultracold neutron (UCN) detector with Ti/ sup 6 LiF multi-layer converter and sup 5 sup 8 Ni reflector

    CERN Document Server

    Maier-Komor, P; Bergmaier, A; Dollinger, G; Paul, S; Petzoldt, G; Schott, W

    2002-01-01

    High efficient detectors for ultracold neutrons (UCN) must be developed for the new high flux neutron source Forschungsreaktor Muenchen II (FRM II). On silicon PIN diodes 76 mu g/cm sup 2 sup 5 sup 8 Ni was deposited as a UCN reflector. On this 100 double layers of sup n sup a sup t Ti (4.7 mu g/cm sup 2) and sup 6 LiF (1.8 mu g/cm sup 2) were deposited to function as a UCN converter. On top of this, 33 double layers of sup n sup a sup t Ti (3.4 mu g/cm sup 2) and sup 6 LiF (0.92 mu g/cm sup 2) were condensed in addition to provide sensitivity to very low-energy UCN. Finally, 6.0 mu g/cm sup 2 sup n sup a sup t V was deposited to protect the multi-layers. Vanadium has nearly zero optical potential for UCN and thus should not hinder their transmission. Since no expensive isotopes were involved, a source to substrate distance of 24 cm could be chosen, leading to excellent uniformity. The setup designed for deposition under ultrahigh vacuum conditions and the evaporation procedures are described.

  10. Simultaneous measurement of angular distribution of elastic scattering for {sup 6}Li, {sup 7}Be, and {sup 8}B in {sup 58}Ni; Medida simultanea de Distribuciones Angulares de Dispersion Elastica para {sup 6}Li, {sup 7}Be, y {sup 8}B en {sup 58}Ni

    Energy Technology Data Exchange (ETDEWEB)

    Ruiz S, A. [Facultad de Ciencias, UAEM, Toluca, Estado de Mexico (Mexico); Martinez Q, E.; Aguilera R, E.F.; Murillo O, G.; Lizcano C, D.; Gomez C, A. [Departamento de Aceleradores, ININ, 52750 La Marquesa, Estado de Mexico (Mexico)

    2007-07-01

    The experimental angular distributions of elastic scattering for the projectiles {sup 6}Li, {sup 7}Be, {sup 8}B in {sup 58}Ni were obtained. Using the Optical model with a Woods-Saxon potential form, as much for the real part as for the imaginary one, an adjustment to the experimental data varying only the depth of the imaginary part of the potential is made. A comparison of the results obtained for each projectile is made. (Author)

  11. Angular Distribution and Cross Section Measurement of the 6Li(3He,n8B Reaction at 5.8 MeV

    Directory of Open Access Journals (Sweden)

    Cinausero M.

    2014-03-01

    Full Text Available The reaction 6Li(3He,n8B was studied at Laboratori Nazionali di Legnaro in the framework of the EUROnu Design Study for a Beta Beam facility at CERN. The 8B production cross section was determined through neutron angular distribution by using the time-of-flight technique. Thanks to the high statistics achieved, the neutron angular distribution for the population of the 8B first excited state has been measured for the first time. Discrepancies with other available data sets for 8B ground state population are discussed and interpreted in the framework of DWBA calculations. Further measurements at beam energies above 10 MeV are needed to clarify the behaviour of the angular distribution

  12. Two-stage magneto-optical trapping and narrow-line cooling of $^6$Li atoms to high phase-space density

    CERN Document Server

    Sebastian, Jimmy; Li, Ke; Gan, Huat Chai Jaren; Li, Wenhui; Dieckmann, Kai

    2014-01-01

    We report an experimental study of peak and phase-space density of a two-stage magneto-optical trap (MOT) of 6-Li atoms, which exploits the narrower $2S_{1/2}\\rightarrow 3P_{3/2}$ ultra-violet (UV) transition at 323 nm following trapping and cooling on the more common D2 transition at 671 nm. The UV MOT is loaded from a red MOT and is compressed to give a high phase-space density up to $3\\times 10^{-4}$. Temperatures as low as 33 $\\mu$K are achieved on the UV transition. We study the density limiting factors and in particular find a value for the light-assisted collisional loss coefficient of $1.3 \\pm0.4\\times10^{-10}\\,\\textrm{cm}^3/\\textrm{s}$ for low repumping intensity.

  13. Microscopic Model Analysis of the $^{6}He,^{6}Li$ + $^{28}Si$ Total Reaction Cross Sections at the Energy Range 5-50 a Mev

    CERN Document Server

    Lukyanov, K V; Lukyanov, V K; Penionzhkevich, Yu E; Sobolev, Y G; Zemlyanaya, E V; Penionzhkevich, Yu.E.; Sobolev, Yu.G.

    2007-01-01

    The existing and some preliminary experimental data on the total cross sections of the $^{4,6}$He, $^{6,7}$Li +$^{28}$Si reactions at energies E=5-50 A MeV are demonstrated. The data on $^{6}$Li,$^{6}$He+$^{28}$Si are analyzed in the framework of the microscopic optical potential with real and imaginary parts obtained with a help of the double-folding procedure and by using the current models of densities of the projectile nuclei. Besides, the microscopic double-folding Coulomb potential is calculated and its effect on cross sections is compared with that when one applies the traditional Coulomb potential of the uniform charge distribution. The semi-microscopic potentials are constructed from both the renormalized microscopic potentials and their derivatives to take into account collective motion effect and to improve an agreement with experimental data.

  14. Detector for the FSD Fourier-Diffractometer Based on ZnS(Ag)/^{6}LiF Scintillation Screen and Wavelength Shifting Fibers Readout

    CERN Document Server

    Kuzmin, E S; Bokuchava, G D; Zhuk, V V; Kudryashov, V A; Buklin, A P; Trounov, V A

    2001-01-01

    At the IBR-2 pulsed reactor (FLNP, JINR, Dubna), a specialized time-of-flight instrument Fourier-Stress-Diffractometer (FSD) intended for the measurement of internal steresses in bulk samples by using high-resolution neutron diffraction is under construction. One of the main components of the diffractometer is a new-type detector with combined electronic - geometrical focusing uniting a large solid angle and a small geometry contribution to the instrumental resolution. The first two modules of the detector, based on scintillation screen ZnS(Ag)/^{6}LiF with wavelength shifting fibers readout have been developed and tested. The design of the detector and associated electronics are described. The method of time focusing surface approximation, using the screen flexibility is proposed. Characteristics of tested modules in comparison with a detector of previous generation are presented and advantages of new detector design for high-resolution diffractometry are discussed.

  15. Magnetic signature of charge ordering in Li[Mn sub 1 sub . sub 9 sub 6 Li sub 0 sub . sub 0 sub 4]O sub 4 and Li sub 0 sub . sub 2 [Mn sub 1 sub . sub 9 sub 6 Li sub 0 sub . sub 0 sub 4]O sub 4

    CERN Document Server

    Verhoeven, V W J; Mulder, F M

    2002-01-01

    The stoichiometric compound LiMn sub 2 O sub 4 is known to show charge ordering with well-defined Mn sup 3 sup + and Mn sup 4 sup + sites just below room temperature (RT). Above RT the electrons are hopping rapidly between sites. For lithium-ion batteries the material Li[Mn sub 1 sub . sub 9 sub 6 Li sub 0 sub . sub 0 sub 4]O sub 4 is technologically relevant. Due to the small amount of Li on the Mn site, the low-T regular ordering of the Mn charge appears to be destroyed completely, as is evidenced by neutron diffraction in the magnetically ordered state. However, the charges are still fixed in an irregular fashion, as can also be deduced from sup 7 Li nuclear magnetic resonance measurements. In the lithium-extracted compound Li sub 0 sub . sub 2 [Mn sub 1 sub . sub 9 sub 6 Li sub 0 sub . sub 0 sub 4]O sub 4 , predominantly Mn sup 4 sup + is present. Neutron diffraction in the magnetically ordered state shows a well-defined antiferromagnetic ordering, with doubling of the unit cell in three directions. Clear...

  16. Elastic scattering and total reaction cross sections for {sup 8}B, {sup 7}Be and {sup 6}Li + {sup 12}C systems

    Energy Technology Data Exchange (ETDEWEB)

    Zamora, J.C.; Barioni, A.; Guimaraes, V. [Universidade de Sao Paulo (USP), SP (Brazil); Paes, B.; Lubian, J. [Universidade Federal Fluminense (UFF), Niteroi, RJ (Brazil); Aguilera, E.F. [Instituto Nacional de Investigaciones Nucleares (Mexico); Kolata, J.J.; Roberts, A.L. [University of Notre Dame, Indiana (United States); Becchetti, F.D.; Villano, A.; Ojaruega, M.; Jing, H. [University of Michigan (United States)

    2011-07-01

    In this work we have measured angular distributions for the elastic scattering of {sup 8}B, {sup 7}Be and {sup 6}Li on {sup 12}C target at laboratory energies of 25.8 MeV, 18.8 MeV and 12.3 MeV, respectively. The optical model has been used for the analysis of such data using Woods-Saxon and Sao Paulo potentials. We also probed the effect of breakup on the elastic scattering of {sup 8}B+{sup 12}C as this mechanism may become important due to the low binding energy of this nucleus. This investigation was performed by means of coupled channels calculations and cluster folding potentials. This study is very interesting because there are few data on {sup 8}B elastic scattering. There are some of its elastic scattering on carbon target, but at higher energies, where it was not possible to get information on its halo peculiarities. Also, we present here the total reaction cross section obtained from the elastic scattering analysis and compared with other weakly and tightly bound projectiles on carbon target. (author)

  17. Pulse shape discrimination characteristics of stilbene crystal, pure and 6Li loaded plastic scintillators for a high resolution coded-aperture neutron imager

    Science.gov (United States)

    Cieślak, M. J.; Gamage, K. A. A.; Glover, R.

    2017-07-01

    Pulse shape discrimination performances of single stilbene crystal, pure plastic and 6Li loaded plastic scintillators have been compared. Three pulse shape discrimination algorithms have been tested for each scintillator sample, assessing their quality of neutron/gamma separation. Additionally, the digital implementation feasibility of each algorithm in a real-time embedded system was evaluated. Considering the pixelated architecture of the coded-aperture imaging system, a reliable method of simultaneous multi-channel neutron/gamma discrimination was sought, accounting for the short data analysis window available for each individual channel. In this study, each scintillator sample was irradiated with a 252Cf neutron source and a bespoke digitiser system was used to collect the data allowing detailed offline examination of the sampled pulses. The figure-of-merit was utilised to compare the discrimination quality of the collected events with respect to various discrimination algorithms. Single stilbene crystal presents superior neutron/gamma separation performance when compared to the plastic scintillator samples.

  18. Ca(AlH4)2, CaAlH5, and CaH2+6LiBH4: Calculated dehydrogenation enthalpy, including zero point energy, and the structure of the phonon spectra

    NARCIS (Netherlands)

    Marashdeh, A.; Frankcombe, T.J.

    2008-01-01

    The dehydrogenation enthalpies of Ca(AlH4)2, CaAlH5, and CaH2+6LiBH4 have been calculated using density functional theory calculations at the generalized gradient approximation level. Harmonic phonon zero point energy (ZPE) corrections have been included using Parlinski’s direct method. The dehydrog

  19. {sup 6}Li({sup 18}O, {sup 17}O){sup 7}Li reaction and comparison of {sup 6, 7}Li + {sup 16, 17, 18}O potentials

    Energy Technology Data Exchange (ETDEWEB)

    Rudchik, A.T., E-mail: rudchik@kinr.kiev.ua [Institute for Nuclear Research, Ukrainian Academy of Sciences, Prospect Nauki 47, 03680 Kyiv (Ukraine); Chercas, K.A. [Institute for Nuclear Research, Ukrainian Academy of Sciences, Prospect Nauki 47, 03680 Kyiv (Ukraine); Kemper, K.W. [Physics Department, Florida State University, Tallahassee, FL 32306-4350 (United States); Rudchik, A.A. [Institute for Nuclear Research, Ukrainian Academy of Sciences, Prospect Nauki 47, 03680 Kyiv (Ukraine); Kliczewski, S. [H. Niewodniczański Institute of Nuclear Physics, Polish Academy of Sciences, ul. Radzikowskiego 152, PL-31-342 Cracow (Poland); Koshchy, E.I. [Kharkiv National University, pl. Svobody 4, 61077 Kharkiv (Ukraine); Rusek, K. [National Center for Nuclear Reseaches, ul. Hoża 69, PL-00-681 Warsaw (Poland); Heavy Ion Laboratory of Warsaw University, ul. L. Pasteura 5A, PL-02-093 Warsaw (Poland); Mezhevych, S.Yu.; Ponkratenko, O.A.; Pirnak, Val.M. [Institute for Nuclear Research, Ukrainian Academy of Sciences, Prospect Nauki 47, 03680 Kyiv (Ukraine); Plujko, V.A. [Taras Shevchenko National University, ul. Volodymyrska 64, 01033 Kyiv (Ukraine); Choiński, J. [Heavy Ion Laboratory of Warsaw University, ul. L. Pasteura 5A, PL-02-093 Warsaw (Poland); Czech, B.; Siudak, R.; Szczurek, A. [H. Niewodniczański Institute of Nuclear Physics, Polish Academy of Sciences, ul. Radzikowskiego 152, PL-31-342 Cracow (Poland)

    2014-07-15

    Angular distributions of the {sup 6}Li({sup 18}O, {sup 17}O){sup 7}Li reaction were measured at E{sub lab}({sup 18}O)=114 MeV for ground and excited states of the exit channel nuclei for the first time. The data were analyzed within the coupled-reaction-channels method (CRC). The {sup 6}Li + {sup 18}O elastic and inelastic scattering channels as well as simplest one- and two-step reactions were included in the coupled-reaction-channels scheme. The {sup 7}Li + {sup 17}O potential was deduced by fitting CRC calculations to the reaction data. The spectroscopic amplitudes for single nucleon and nuclear cluster configurations were calculated within the translationally invariant shell model. Isotopic differences of the {sup 7}Li + {sup 16, 17, 18}O and {sup 7, 8}Li + {sup 17}O potentials and the reaction mechanisms were studied.

  20. Digital signal processing for a thermal neutron detector using ZnS(Ag):{sup 6}LiF scintillating layers read out with WLS fibers and SiPMs

    Energy Technology Data Exchange (ETDEWEB)

    Mosset, J.-B., E-mail: jean-baptiste.mosset@psi.ch; Stoykov, A.; Greuter, U.; Hildebrandt, M.; Schlumpf, N.

    2016-07-11

    We present a digital signal processing system based on a photon counting approach which we developed for a thermal neutron detector consisting of ZnS(Ag):{sup 6}LiF scintillating layers read out with WLS fibers and SiPMs. Three digital filters have been evaluated: a moving sum, a moving sum after differentiation and a digital CR-RC{sup 4} filter. The performances of the detector with these filters are presented. A full analog signal processing using a CR-RC{sup 4} filter has been emulated digitally. The detector performance obtained with this analog approach is compared with the one obtained with the best performing digital approach. - Highlights: • Application of digital signal processing for a SiPM-based ZnS:6LiF neutron detector. • Optimisation of detector performances with 3 different digital filters. • Comparison with detector performances with a full analog signal processing.

  1. Observation of breakup transfer process for the bound states of {sup 16}O populated from {sup 12}C({sup 6}Li,d) reaction at 20 MeV

    Energy Technology Data Exchange (ETDEWEB)

    Adhikari, S.; Basu, C.; Thompson, I. J.; Sugathan, P.; Jhinghan, A.; Golda, K. S.; Babu, A.; Singh, D.; Ray, S.; Mitra, A. K. [Nuclear Physics Division, Saha Institute of Nuclear Physics, Kolkata-700064 (India); Lawrence Livermore National Laboratory, L-414, Livermore CA 94551 (United States); Inter University Accelerator Centre, New Delhi 110067 (India); Physics Department, Ramkrishna Vivekananda University, Belur, Howrah (India); Nuclear Physics Division, Saha Institute of Nuclear Physics, Kolkata-700064 (India)

    2012-10-20

    The deuteron angular distribution for the {sup 12}C({sup 6}Li,d){sup 16}O* has been measured at 20 MeV populating bound and unbound states of {sup 16}O. Analysis shows a dominance of breakup induced alpha transfer in comparison to a direct alpha transfer process for the bound states. The effect increases as the excitation energy of {sup 16}O decreases, maximizing at the ground state.

  2. Ca(AlH4)2, CaAlH5, and CaH2+6LiBH4: Calculated dehydrogenation enthalpy, including zero point energy, and the structure of the phonon spectra.

    Science.gov (United States)

    Marashdeh, Ali; Frankcombe, Terry J

    2008-06-21

    The dehydrogenation enthalpies of Ca(AlH(4))(2), CaAlH(5), and CaH(2)+6LiBH(4) have been calculated using density functional theory calculations at the generalized gradient approximation level. Harmonic phonon zero point energy (ZPE) corrections have been included using Parlinski's direct method. The dehydrogenation of Ca(AlH(4))(2) is exothermic, indicating a metastable hydride. Calculations for CaAlH(5) including ZPE effects indicate that it is not stable enough for a hydrogen storage system operating near ambient conditions. The destabilized combination of LiBH(4) with CaH(2) is a promising system after ZPE-corrected enthalpy calculations. The calculations confirm that including ZPE effects in the harmonic approximation for the dehydrogenation of Ca(AlH(4))(2), CaAlH(5), and CaH(2)+6LiBH(4) has a significant effect on the calculated reaction enthalpy. The contribution of ZPE to the dehydrogenation enthalpies of Ca(AlH(4))(2) and CaAlH(5) calculated by the direct method phonon analysis was compared to that calculated by the frozen-phonon method. The crystal structure of CaAlH(5) is presented in the more useful standard setting of P2(1)c symmetry and the phonon density of states of CaAlH(5), significantly different to other common complex metal hydrides, is rationalized.

  3. The use of enriched 6Li and 7Li Lif:Mg,Cu,P glass-rod thermoluminescent dosemeters for linear accelerator out-of-field radiation dose measurements.

    Science.gov (United States)

    Takam, R; Bezak, E; Liu, G; Marcu, L

    2012-06-01

    (6)LiF:Mg,Cu,P and (7)LiF:Mg,Cu,P glass-rod thermoluminescent dosemeters (TLDs) were used for measurements of out-of-field photon and neutron doses produced by Varian iX linear accelerator. Both TLDs were calibrated using 18-MV X-ray beam to investigate their dose-response sensitivity and linearity. CR-39 etch-track detectors (Luxel+, Landauer) were employed to provide neutron dose data to calibrate (6)LiF:Mg,Cu,P TLDs at various distances from the isocentre. With cadmium filters employed, slow neutrons (neutrons. The average in-air photon dose equivalents per monitor unit (MU) ranged from 1.5±0.4 to 215.5±94.6 μSv at 100 and 15 cm from the isocentre, respectively. Based on the cross-calibration factors obtained with CR-39 etch-track detectors, the average in-air fast neutron dose equivalents per MU range from 10.6±3.8 to 59.1±49.9 μSv at 100 and 15 cm from the isocentre, respectively. Contribution of thermal neutrons to total neutron dose equivalent was small: 3.1±7.2 μSv per MU at 15 cm from the isocentre.

  4. 基于6LiF/ZnS(Ag)闪烁体波移光纤读出中子探测器模拟研究%The Monte-Carlo Simulation on Neutron Detector of 6LiF/ZnS(Ag)Scintillator Using Wavelength-Shifting Readout Fibers

    Institute of Scientific and Technical Information of China (English)

    吴冲; 张强; 张鹏; 孙志嘉; 唐彬; 王拓

    2012-01-01

    利用GEANT4构建二维位置灵敏型闪烁体中子探测器模型,并对探测器的关键性能进行了系统的模拟研究.计算结果表明,采用双层闪烁屏与波移光纤作为夹层的“三明治”式结构探测器,其热中子探测效率可以达到49.1%.模拟和实验均表明:探测器具有较好的n/γ抑制能力.γ灵敏度小于10-5;中子位置分辨率随着光纤芯间距和光纤与闪烁屏距离的减小呈现减小趋势,本征空间分辨率最好可以达到X轴0.08 mm,Y轴0.12 mm;光纤与闪烁屏之间采用空气耦合位置分辨率好于硅油耦合.模拟结果与部分实验结果的对比验证显示,探测器具有较好的二维成像能力.%A prototype of position sensitive neutron detector based on 6LiF/ZnS(Ag) scintillator was constructed by GEANT 4 package, and its key properties were studied. The simulation result shows that the thermal neutron detection efficiency could reach 49.1% when the "sandwich structure" of detector was set. Both simulation and experimental result plot its good ability of n/y rejection ration,and the gamma sensitive is less than 10-5. The influences of the coupled material and space between wavelength shift fibers and scintillator,as well as the space between two fibers are considered. The intrinsic spatial resolution is 0. 08 mm for X-axis and 0.12 mm for Y-axis,and the detector has a good 2D imaging capability. The simulation results are compared with that of parts experimental results.

  5. The study of 12C(α,γ astrophysical reaction using 12C(6Li,d and 12C(7Li,t reaction at 20 MeV and in the framework of the potential model

    Directory of Open Access Journals (Sweden)

    Adhikari S.

    2015-01-01

    Full Text Available The triton angular distribution in the 12C(7Li,t16O reaction has been measured at 20 MeV incident energy. Comparison of the data with Finite Range DWBA and CDCC-CRC calculations show that breakup coupling effects are prominent in the transfer to the ground state. This observation is similar to that in the 12C(6Li,d reaction at the same incident energy. The alpha spectroscopic factor of the 16O ground state is determined (Sα=0.25 from a comparison of the measured angular distribution with respect to the CDCC-CRC calculations. The E2 S-factor of the 12C(α,γ reaction at 300 keV in the framework of a potential model is determined to be about 118 keV-barn.

  6. Neutron-induced background by an alpha-beam incident on a deuterium gas target and its implications for the study of the 2H(alpha,gamma)6Li reaction at LUNA

    CERN Document Server

    Anders, M; Bellini, A; Aliotta, M; Bemmerer, D; Broggini, C; Caciolli, A; Costantini, H; Corvisiero, P; Davinson, T; Elekes, Z; Erhard, M; Formicola, A; Fülöp, Zs; Gervino, G; Guglielmetti, A; Gustavino, C; Gyürky, Gy; Junker, M; Lemut, A; Marta, M; Mazzocchi, C; Menegazzo, R; Prati, P; Alvarez, C Rossi; Scott, D; Somorjai, E; Straniero, O; Szücs, T

    2013-01-01

    The production of the stable isotope Li-6 in standard Big Bang nucleosynthesis has recently attracted much interest. Recent observations in metal-poor stars suggest that a cosmological Li-6 plateau may exist. If true, this plateau would come in addition to the well-known Spite plateau of Li-7 abundances and would point to a predominantly primordial origin of Li-6, contrary to the results of standard Big Bang nucleosynthesis calculations. Therefore, the nuclear physics underlying Big Bang Li-6 production must be revisited. The main production channel for Li-6 in the Big Bang is the 2H(alpha,gamma)6Li reaction. The present work reports on neutron-induced effects in a high-purity germanium detector that were encountered in a new study of this reaction. In the experiment, an {\\alpha}-beam from the underground accelerator LUNA in Gran Sasso, Italy, and a windowless deuterium gas target are used. A low neutron flux is induced by energetic deuterons from elastic scattering and, subsequently, the 2H(d,n)3He reaction....

  7. Evaluation of two thermal neutron detection units consisting of ZnS/${}^6$LiF scintillating layers with embedded WLS fibers read out with a SiPM

    CERN Document Server

    Mosset, J -B; Greuter, U; Hildebrandt, M; Schlumpf, N; Van Swygenhoven, H

    2014-01-01

    Two single channel detection units for thermal neutron detection are investigated in a neutron beam. They consist of two ZnS/${}^6$LiF scintillating layers sandwiching an array of WLS fibers. The pattern of this units can be repeated laterally and vertically in order to build up a one dimensional position sensitive multi-channel detector with the needed sensitive surface and with the required neutron absorption probability. The originality of this work arises from the fact that the WLS fibers are read out with SiPMs instead of the traditionally used PMTs or MaPMTs. The signal processing system is based on a photon counting approach. For SiPMs with a dark count rate as high as 0.7 MHz, a trigger efficiency of 80% is achieved together with a system background rate lower than ${10}^{-3}$ Hz and a dead time of 30 $\\mu$s. No change of performance is observed for neutron count rates of up to 3.6 kHz.

  8. Alpha-gamma pulse shape discrimination in CsI:Tl, CsI:Na and BaF sub 2 scintillators

    CERN Document Server

    Dinca, L E; Haas, J; Bom, V R; Eijk, C W E

    2002-01-01

    Some scintillating materials offer the possibility of measuring well separated alpha and gamma scintillation response using a single crystal. Eventually aiming at thermal neutron detection using sup 6 Li or sup 1 sup 0 B admixture, pulse shape discrimination measurements were made on three scintillators: CsI:Tl, CsI:Na and pure BaF sub 2 crystals. A very good alpha/gamma discrimination was obtained using sup 2 sup 2 Na, sup 2 sup 4 sup 1 Am (gamma) and sup 2 sup 4 sup 4 Cm (alpha) radioactive sources.

  9. Novel cathode materials LixNa2-xV2O6 (x = 2, 1.4, 1, 0) for high-performance lithium-ion batteries

    Science.gov (United States)

    Li, Kaiqi; Cao, Liufei; Huang, Zheng; Chen, Liang; Chen, Zhongxue; Fu, Chaopeng

    2017-03-01

    In this work, sodium doped LiVO3 cathode is proposed to achieve enhanced cycling performance for lithium ion battery (LIB) application. LixNa2-xV2O6 (x = 2, 1.4, 1, 0) compounds have been prepared and characterized, and X-ray diffraction patterns confirmed the successful Na doping with various amounts in the LiVO3. The electrochemical performances of the various Na doped compounds LiVO3, Li1.4Na0.6V2O6, LiNaV2O6, and NaVO3 are evaluated by cyclic voltammetry, galvanostatic charge/discharge and electrochemical impedance spectroscopy. The results reveal that Na-doping amount strongly affects the electrochemical performance, and LiNaV2O6 (x = 1) is considered as the optimized Na doped compound for LIB cathodes. The LiNaV2O6 cathode displays enhanced cycling and rate performances as a specific capacity of 193 mAh g-1 at 0.5 C after 100 cycles is delivered. The enhanced performance is explained that the doping of Na can provide good channels and increase Li+ diffusion coefficient for lithium ion intercalation/deintercalation.

  10. Li2ZrO3-coated 0.4Li2MnO3·0.6LiNi1/3Co1/3Mn1/3O2 for high performance cathode material in lithium-ion battery

    Science.gov (United States)

    Miao, Xiaowei; Ni, Huan; Zhang, Han; Wang, Chunguang; Fang, Jianhui; Yang, Gang

    2014-10-01

    To improve the high-rate capacity and cycle ability, minor Li2ZrO3 successfully coat the nanoparticles of 0.4Li2MnO3·0.6LiNi1/3Co1/3Mn1/3O2 (LMO) via sol-gel method. The crystal structure and electrochemical properties of the bare and coated material are studied by X-ray diffractometry (XRD), transmission electron microscopy (TEM), cyclic voltammetry (CV), galvanostatic intermittent titration technique (GITT), and charge-discharge tests. The lithium diffusion coefficient of LMO increases one to two orders of magnitude after Li2ZrO3 coating. Li2ZrO3 coating improves the rate capability and cycling stability of LMO. Within the cut-off voltage of 2.5-4.8 V, the initial discharge capacity of Li2ZrO3-coated 0.4Li2MnO3·0.6LiNi1/3Co1/3Mn1/3O2 (LZO-LMO) reaches to 264 mAh g-1 at 0.1 C rate, and the capacity remains 235 mAh g-1 after 100 cycles. At the current rates of 1, 2, 5 and 10 C, the maximum discharge capacities of LZO-LMO are 205.6, 161, 153.8 and 106 mAh g-1, respectively. Minor Li2ZrO3 modification plays an important role to enhance the high-rate capability and cycle ability of LMO.

  11. NA44 experiment

    CERN Document Server

    1990-01-01

    General view of NA44 experiment. NA44 is one of the seven experiments (NA44, NA45, NA49, NA50, NA52, WA97/NA57 and WA98) involved in CERN'S Heavy Ion programme which provided evidence for the existence of a new state of matter in which quarks, instead of being bound up into more complex particles such as protons and neutrons, are liberated and roam freely. Theory predicts that this state must have existed at about 10 microseconds after the Big Bang, before the formation of matter as we know it today.

  12. Measurement of multinucleon transfer cross-sections in 58Ni,56Fe(12C, ); : 13,11C, 11,10B, 10,9,7Be, 8Be.s. and 7,6Li at (12C) = 60 MeV

    Indian Academy of Sciences (India)

    B J Roy; A Parmar; T Nandi; Biraja Mohanty; M Oswal; Sunil Kumar; A Jhingan; V Jha; D C Biswas

    2016-01-01

    Cross-sections for one- and multinucleon transfer reactions, namely, 58Ni(12C, 13C), 58Ni(12C, 11C), 58Ni(12C, 11B), 58Ni(12C, 10B), 58Ni(12C, 10Be), 58Ni(12C, 9Be), 58Ni(12C, 8Be.s.), 58Ni(12C, 7Be), 58Ni(12C, 7Li) and 58Ni(12C, 6Li) have been measured at an incident energy of 60 MeV. The reaction cross-section for the corresponding transfer channels in the system 12C+56Fe have also been measured under the same kinematical conditions. Angular distribution of the elastic scattering cross-section is measured at 60 MeV. The measured elastic scattering angular distributions for these two systems have been analysed using the optical model search code SFRESCO and the potential parameters are extracted. The multinucleon transfer data are analysed to obtain cross-section dependence on the number of nucleons transferred and on the ground state -values. The transfer probabilities for multinucleon stripping are extracted. A detailed comparison in the multiparticle stripping and elastic scattering cross-sections between these two systems are made to understand the mechanism of multinucleon transfer and possible role of two extra protons in 58Ni target nucleus as compared to the 56Fe core.

  13. Angelite: Paziteli na vhoda

    Directory of Open Access Journals (Sweden)

    Gerov Georgi

    2009-01-01

    Full Text Available (bugarski Statijata prosledjava ikonografskata evoljucija na izobraženijata na arhangelite Mihail i Gavriil, pomesteni pri vhoda na pravoslavnija hram. Povraten moment v neja e 13 vek. Togava arhangel Mihail započva da se izobrazjava kato voin. S tova apotropejnite mu funkcii namirat adekvaten vizualen izraz. K'm kraja na stoletieto arhangel Gavriil započva da se izobrazjava kato pisar - ikonografija, kojato šče b'de dorazvita i utv'rdena prez 14 vek. Prez postvizantijskata epoha v obraza na Mihail se pojavjavat elementi, koito akcentirat v'rhu roljata mu na psihopomp.

  14. Enhanced Li storage performance of LiNi(0.5)Mn(1.5)O(4)-coated 0.4Li(2)MnO(3)·0.6LiNi(1/3)Co(1/3)Mn(1/3)O(2) cathode materials for li-ion batteries.

    Science.gov (United States)

    Chen, Yufang; Xie, Kai; Zheng, Chunman; Ma, Zhongyun; Chen, Zhongxue

    2014-10-08

    In this study, Li-rich cathode, 0.4Li2MnO3·0.6LiNi1/3Co1/3Mn1/3O2 was synthesized by a resorcinol formaldehyde assisted sol-gel method for the first time. Then, the surface of the as-prepared Li-rich cathode was modified with different amounts of LiNi0.5Mn1.5O4 (5, 10, and 20 wt %) through a simple dip-dry approach. The structural and electrochemical characterizations revealed that the spinel LiNi0.5Mn1.5O4 coating not only can prevent electrolytes from eroding the Li-rich core but also can facilitate fast lithium ion transportation. As a result, the 20 wt % coated sample delivered an initial discharge capacity of 298.6 mAh g(-1) with a Coulombic efficiency of 84.8%, compared to 281.1 mAh g(-1) and 70.2%, respectively, for the bare sample. Particularly, the coated sample demonstrates a Li storage capacity of 170.7 mAh g(-1) and capacity retention of 94.4% after 100 cycles at a high rate of 5 C (1250 mA g(-1)), showing a prospect for practical lithium battery applications. More significantly, the synthetic method proposed in this work is facile and low-cost and possibly could be adopted for large-scale production of surface-modified cathode materials.

  15. Efektite na prostaciklin vo tretmanot na dijabeticnata nefropatija kaj staorci

    Directory of Open Access Journals (Sweden)

    Jasmina Trojacanec

    2006-06-01

    Full Text Available Mikrovaskularnite komplikacii, a pred se dijabeticnata nefropatija, se edni od najteskite komplikacii na dijabetot, od koi vo golema mera zavisi i prognozata na dijabetot kaj ovie pacienti. Etiopatogenezata na ovaa komplikacija e multifaktorijalna i za sega se uste ne kompletno rasvetlena, a vklucuva morfoloski, patolosko-anatomski i biohemiski metabolni narusuvanja. Se smeta deka narusuvanjeto na modularnata funkcija na endoteliumot moze da bide kriticen i inicijalen faktor vo razvojot na dijabeticnite vaskularni komplikacii. Vrz osnova na farmakodinamskite efekti koi sto gi poseduva prostaciklinot (PGI2 i negovite analozi, se smeta deka istite moze da bidat korisni vo tretmanot na dijabeti~nata nefropatija. Osnovna cel na ovaa studija be{e da se procenat efektite na prostaciklin (PGI2 vo tretmanot na dijabeticnata nefropatija, eksperimentalno predizvikana so streptozocin. Kaj normotenzivni staorci od sojot Wistar, eksperimentalno bese induciran najprvin dijabet so ednokratna i.p. administracija na streptozocin (STZ, a kako komplikacija na dijabetot i jasni znaci i simptomi na dijabeticna nefropatija (proteinurija, zgolemeno serumsko nivo na urea i kreatinin, poliurija, zgolemena aktivnost na NAG vo mockata. Tretman so prostaciklin (p.o. vo doza od 0.1 mg/kg /t.t./den, vo tekot na 4 nedeli, dovede do signifikantno namaluvanje na simptomite i znacite na bubreznite ostetuvanja, vo odnos na grupata zivotni koi ne primaa prostaciklin. Vrz osnova na dobienite rezultati moze da se zakluci deka prostaciklinot moze da ima znacajna uloga vo tretmanot na dijabeticnata nefropatija, eksperimentalno inducirana so streptozocin.

  16. A serendipidade na medicina e na anestesiologia

    OpenAIRE

    Vale,Nilton Bezerra do; Delfino,José; Vale,Lúcio Flávio Bezerra do

    2005-01-01

    JUSTIFICATIVA E OBJETIVOS: Neste trabalho foram examinados mais de uma centena dos mais felizes acoplamentos de uma mente brilhante com a sorte benfazeja (serendipidade), através da releitura das mais relevantes histórias sobre invenções e descobertas relacionadas à ciência (n = 46), à Medicina (n = 46) e à Anestesiologia (n = 16). CONTEÚDO: Conceito de serendipidade; exemplos célebres de serendipidade em Ciência e Tecnologia; serendipidade na pesquisa e prática médicas; serendipidade na Anes...

  17. Bolonja na hrvatski način

    OpenAIRE

    Krstović, Jasna

    2009-01-01

    Iako je osnovna značajka obrazovnog sustava Republike Hrvatske horizontalna i okomita protočnost, ova se značajka još uvijek ne odnosi na obrazovanje odgajatelja. No u posljednje vrijeme događaju se pomaci i kvalitativne promjene koje su zahvatile i sustav obrazovanja hrvatskih odgajatelja.

  18. Calculation of the spectral, structural, and electronic properties of NaCrSi2O6 and LiCrSi2O6 crystals

    Science.gov (United States)

    Brik, M. G.; Avram, N. M.; Gruia, A. S.

    2013-08-01

    Spectral, structural and electronic properties of two Cr3+-bearing systems (NaCrSi2O6, LiCrSi2O6) have been theoretically modeled using two different approaches: semi-empirical model of crystal field, in the framework of the Exchange Charge Model and two ab initio DFT-based calculations, as implemented in the CASTEP module [1] of Materials Studio package [2] and, for reliability, CRYSTAL09 code [3]. The first one allows for calculations of the electronic levels of sixfold coordinated Cr3+ ions in a crystal field of host's ligands and direct comparison with experimental absorption spectra [4]. The latter two allow for the analysis of the band structure and density of states (DOS), after optimization of the crystal lattice structures of these materials. In particular, a special attention was paid to the energetic position of the Cr3+ 3d states. All obtained results are compared with corresponding experimental values and discussed.

  19. At NA2

    CERN Multimedia

    1977-01-01

    One of the NA2 calorimeter sections is moved in. The NA2 calorimeter was divided in two halves, to the left and the right of the beam, each half consisting of sheets of passive high Z material interleaved with blades of plastic scintillators. The photo shows on the right, the upstream 'electron' module with eleven lead plates for a total radiation length of 20.

  20. ETAŽNA LASTNINA S POUDARKOM NA ZVEtL

    OpenAIRE

    Cvetko, Tadej

    2014-01-01

    Etažna lastnina je lastnina posameznega dela zgradbe in solastnina na skupnih delih, ki služijo vsem ali nekaterim posameznim delom zgradbe. Etažna lastnino na območju Republike Slovenije je uvedel Zakon o lastnini na delih stavbe kot odgovor na potrebo po hitri nacionalizaciji stanovanj in odrazu doslednega uvajanja osnovne ideje takratnega socialističnega duha t.j. družbene lastnine. Slovenija kot mlada demokratična država je ob tranziciji iz socialističnega v demokratični sistem poskušala ...

  1. NAKUPOVANJE NA SPLETU

    OpenAIRE

    Visenjak, Monika

    2013-01-01

    Nakupovanje na spletu je prihodnost poslovanja. Za podjetja pomeni manjše stroške, lažje prilagajanje tržnim pogojem. Hitreje lahko razvijajo odnose in analizirajo uporabnike, saj jim je dan dostop o nakupnih podatkih uporabnika. Za potrošnike je nakupovanje na spletu možnost hitrega, preprostega in učinkovitega nakupovanja od doma ali pisarne. Pomembno je, da se seznanijo z vsemi informacijami in pogoji spletnih trgovin, saj se lahko le tako izognejo nezadovoljstvu ob nakupu v spletni trgovi...

  2. Riso na epilepsia

    Directory of Open Access Journals (Sweden)

    Edymar Jardim

    1967-06-01

    Full Text Available São estudados três casos de síndrome convulsiva temporal, com manifestações concomitantes de riso na sua fase inicial. As características principais foram a imotivação e á incoercibilidade do riso. Esses sintomas desapareceram com o uso de anticonvulsivantes.

  3. The NA48 experiment

    CERN Multimedia

    1995-01-01

    The NA48 experiment is designed to study the Charge-Parity (CP) violation. CP violation is observed in certain very rare decays. Its study is important in understanding Nature's preference of matter over antimatter, which resulted in asymmetry soon after the Big Bang, creating a matter-dominated Universe.

  4. Biotecnologia na agricultura

    Directory of Open Access Journals (Sweden)

    Helaine Carrer

    2010-01-01

    Full Text Available A expectativa de o crescimento populacional atingir 9 bilhões de habitantes em 2050 em adição às questões da sustentabilidade e do aquecimento global nos desafiam a aumentar a oferta de alimentos. Uma metodologia alternativa que contribua para a redução do impacto desse cenário envolve a biotecnologia, que, nas últimas décadas, trouxe marcantes oportunidades tecnológicas na agricultura, resultando em relevante desenvolvimento na obtenção de novas variedades de plantas, na melhoria da qualidade de diversos alimentos e atualmente também na bioenergia. As técnicas biotecnológicas envolvendo os marcadores moleculares, a genômica e a transformação genética estão transformando a agricultura e são discutidas neste artigo.The expected population growth to reach 9 billion by 2050 in addition to issues of sustainability and global warming challenges us to increase the supply of food. An alternative approach to help reducing the impact of this scenario involves biotechnology which in recent decades has brought remarkable technological opportunities in the agriculture that resulted in relevant development in obtaining new plant varieties, improved quality of different foods, and now also in bioenergy. The biotechnology techniques involving molecular markers, genomics and genetic transformation are transforming agriculture and will be discussed in this article.

  5. O JORNALISTA NA PESQUISA E NA ARTE

    Directory of Open Access Journals (Sweden)

    Beatriz Marocco

    2013-06-01

    Full Text Available O jornalista tem sido objeto das artes e das ciências. Nesta incisão no tema do painel “Configurações e perspectivas da pesquisa em jornalismo no Brasil em diálogo com os estudos latinoamericanos em jornalismo”, realizado no Encontro Nacional da Sociedade Brasileira de Pesquisadores em Jornalismo/SBPJor (Curitiba, 10/11/2012, reconheci que o âmbito acadêmico projeta dois tipos de ação: em rede de pesquisadores de diferentes países e regiões do mundo, com participação de países da América Latina, na pesquisa colaborativa e em projetos de investigação com outras bases de colaboração. Ambas as modalidades dialogam com a produção do cinema e da literatura – que visibiliza a grande potência do profissional para tramas e tensões. 

  6. Vaginose Bacteriana na Colpocitologia

    OpenAIRE

    Consolaro,Márcia Edilaine Lopes; Suzuki, Linda Emiko

    2008-01-01

    A flora vaginal representa um ecossistema dinâmico influenciado por fatores diversos, existindo mecanismos desconhecidos que alteram esta flora, desencadeando distúrbios como vaginoses bacterianas. Este trabalho teve como objetivo avaliar a incidência de vaginoses bacterianas detectadas por colpocitologia na população atendida pelo Setor de Citologia Clínica do Laboratório de Ensino e Pesquisa em Análises Clínicas (LEPAC) da Univers...

  7. Preparing for NA4

    CERN Multimedia

    1977-01-01

    Here, in one of the EF workshop, Albert Duchêne works on a pretty piece of mechanics. A few others await to be attended on the left. There are indications that the pipes were meant to house the carbon target (subdivided in eight sections) to be installed inside the toroid magnet of the NA4 experiment. The external strips were designed to possibly correct the magnetic field (???).

  8. A epilepsia na neurocisticercose

    Directory of Open Access Journals (Sweden)

    Luís Marques-Assis

    1972-12-01

    Full Text Available Foram estudados 131 casos de epilepsia com etiologia cisticercótica comprovada. A idade variou de 2 a 68 anos; 75 pacientes eram de sexo masculino e 56 de sexo feminino; 117 eram brancos, 10 pardos, três pretos e um amarelo. A idade de início da doença predominou na primeira década. O estudo foi feito em relação ao tipo de epilepsia, ao tempo decorrido após a primeira crise, à freqüência das crises e ao eletrencefalograma relativamente às epilepsias em geral. Investigação foi feita também em relação à cefaléia, aos achados neurológicos, liquóricos, radiológicos simples e contrastados e anátomo-patológicos. A análise dos resultados permitiu aos autores as seguintes conclusões: 1 No grupo de neurocisticercose o início da doença predominou na primeira e a partir da quarta década em relação às epilepsias em geral. 2 Dentre as manifestações clínicas predominaram as formas convulsivas da doença (61%, sendo as crises bravas-jacksonianas as menos freqüentes (4%; quando comparadas com as epilepsias em geral, verifica-se incidência menor das convulsões generalizadas na neurocisticercose. 3 Quanto ao tempo de doença, verifica-se predomínio das formas de duração mais curta (um ano ou menos na neurocisticercose. 4 A severidade da epilepsia, traduzida pela freqüência das crises, foi menor no grupo com neurocisticercose. 5 Excluídos os casos com anormalidades eletrencefalográficas contínuas, foram encontrados maiores índices percentuais de EEG normal na neurocisticercose que nas epilepsias em geral. 6 A cefaléia estava presente em 68% dos casos, assumindo caráter paroxístico na maior parte (78%; em 67% dos casos com cefaléia paroxística não havia concomitantemente sinais de hipertensão intracraniana; nos casos com cefaléia contínua, em apenas dois (13% esses sinais não estavam presentes. 7 Na maior parte dos casos (62% as manifestações epilépticas se apresentaram isoladamente, sem sinais neurol

  9. na Perua

    Directory of Open Access Journals (Sweden)

    Jorge Carvalho

    1989-01-01

    Full Text Available Antes de se caracterizar como tentativa de ensaio ou de análise a qualquer coisa, o presente artigo tem, antes de mais nada, a pretensão de se constituir uma provocação ao debate acerca da questão do esporte na escola. A provocação parte basicamente do relato da minha experiência pessoal como Secretário da Educação do Município de Aracaju, cargo que exerci no período de 1º de janeiro de 1986 a 27 de janeiro de 1987.

  10. Fractais na arquitectura

    OpenAIRE

    2009-01-01

    Uma forma de inovar na simplicidade, em Arquitectura, é usar a geometria dos fractais. Uma técnica simples de iterativamente chegar a formas fantásticas e muito agradáveis de integrar no desenho de uma obra de arte: sejam edifícios, pontes, jardins, e outros. Vamos abordar o conceito essencial da geometria dos fractais e analisar exemplos da sua aplicação em edifícios e cidades. Para isso faz-se uma introdução ao tema pelos primórdios da geometria fractal referindo exemplos como o Co...

  11. A escola na internet

    OpenAIRE

    Albino, Ayrán Lavra

    2003-01-01

    Dissertação (mestrado) - Universidade Federal de Santa Catarina, Centro Tecnológico. Programa de Pós-Graduação em Engenharia de Produção. O presente trabalho pretendeu analisar o uso do suporte tecnológico do ensino a distância (computador e internet) como elemento complementar do ensino presencial. Procurou-se demonstrar, na fundamentação teórica, que as tendências pedagógicas contemporâneas e as características da tecnologia digital viabilizam esta possibilidade. Operacionalizou-se essa ...

  12. Fractais na arquitectura

    OpenAIRE

    Ganhão, Susana Maria Gouveia Rosado

    2009-01-01

    Uma forma de inovar na simplicidade, em Arquitectura, é usar a geometria dos fractais. Uma técnica simples de iterativamente chegar a formas fantásticas e muito agradáveis de integrar no desenho de uma obra de arte: sejam edifícios, pontes, jardins, e outros. Vamos abordar o conceito essencial da geometria dos fractais e analisar exemplos da sua aplicação em edifícios e cidades. Para isso faz-se uma introdução ao tema pelos primórdios da geometria fractal referindo exemplos como o Co...

  13. Report from NA49

    CERN Document Server

    Gazdzicki, M; Anticic, T; Baatar, B; Barna, D; Bartke, Jerzy; Betev, L; Bialkowska, H; Billmeier, A; Blume, C; Boimska, B; Botje, M; Bracinik, J; Bramm, R; Brun, R; Buncic, P; Cerny, V; Christakoglou, P; Chvala, O; Cramer, J G; Csató, P; Darmenov, N; Dimitrov, A; Dinkelaker, P; Eckardt, V; Farantatos, G; Filip, P; Flierl, D; Fodor, Z; Foka, P Y; Freund, P; Friese, V; Gál, J; Georgopoulos, G; Gladysz-Dziadus, E; Grebieszkow, K; Hegyi, S; Höhne, C; Kadija, K; Karev, A; Kliemant, M; Kniege9, S; Kolesnikov, V I; Kollegger, T; Kornas, E; Korus, R; Kowalski, M; Kraus, I; Kreps, M; Van Leeuwen, M; Lévai, Peter; Litov, L; Lungwitz, B; Makariev, M; Malakhov, A I; Markert, C; Mateev, M; Mayes, B W; Melkumov, G L; Meurer, C; Mischke, A; Mitrovski, M; Molnár, J; Mrówczynski, S; Pálla, G; Panagiotou, A D; Panayotov, D; Petridis, A; Pikna, M; Pinsky, L; Pühlhofer, F; Reid, J G; Renfordt, R E; Richard, A; Roland, C; Roland, G; Rybczynski, M; Rybicki, A; Sandoval, A; Sann, H; Schmitz, N; Seyboth, P; Siklér, F; Sitár, B; Skrzypczak, E; Stefanek, G; Stock, R; Ströbele, H; Susa, T; Szentpétery, I; Sziklai, J; Trainor, T A; Varga, D; Vassiliou, Maria; Veres, G I; Vesztergombi, G; Vranic, D; Wetzler, A; Wlodarczyk, Z; Yoo, I K; Zaranek, J; Zimányi, J

    2004-01-01

    The most recent data of NA49 on hadron production in nuclear collisions at CERN SPS energies are presented. Anomalies in the energy dependence of pion and kaon production in central Pb+Pb collisions are observed. They suggest that the onset of deconfinement is located at about 30 AGeV. Large multiplicity and transverse momentum fluctuations are measured for collisions of intermediate mass systems at 158 AGeV. The need for a new experimental programme at the CERN SPS is underlined.

  14. Comprometimento pulmonar na leptospirose

    Directory of Open Access Journals (Sweden)

    Jorge Eduardo Manhães de Carvalho

    1992-03-01

    Full Text Available Em 23 pacientes com leptospirose apresentando comprometimento pulmonar, internados no Hospital Universitário Antônio Pedro da XJFF, Niterói, hemoptise e hemoptóicos foram observados em 21,7% e 30,4%, respectivajnente. Gasometria arterial revelou hipoxemia e hipocapnia na maioria dos casos. Radiografia de tórax em 15 pacientes mostrou comprometimento alveolar em 60%, comprometimento intersticial-reticular em 6%, padrão misto (alveolar e intersticial em20%e ausência de alterações radiológicas em 14%. A necrópsiade 13 pacientes mostrou edema, congestão e hemorragia nos pulmões em 100% dos casos. A hemorragia foi focal em 46% e difusa em 54% dos casos. Houve formação de membrana hialina em 30% e trombos de fibrina em 46% dos pulmões estudados, o que estabelece o diagnóstico da coagulação intravascular disseminada e a ocorrência da síndrome de angústia respiratória na leptospirose.

  15. Laser na medicina: avanços na Oftalmologia

    OpenAIRE

    João Alberto Holanda de Freitas

    2007-01-01

    Entre os grandes avanços tecnológicos dos últimos anos, o laser sem dúvida ocupa lugar de destaque. Desde a construção do primeiro aparelho a laser em 1959, novas aplicações surgem continuadamente. O laser está presente de maneira marcante na pesquisa básica, na indústria e na medicina.

  16. Na Cauda do Cometa

    Science.gov (United States)

    Voelzke, M. R.

    2009-01-01

    Quando viam um cometa, os antigos gregos imaginavam uma estrela com uma vasta cabeleira. Não à toa, a palavra deriva do termo koma, que significa cabelo. Constituídos por fragmentos de gelo e gases, os cometas possuem um núcleo sólido, que pode ter vários quilômetros de diâmetro, e uma cauda que sempre aponta na direção contrária ao Sol, devido aos ventos solares. Graças à aparência de pontos luminosos em movimento (ao contrário de outros astros, que parecem estáticos), esses corpos celestes foram interpretados por diferentes povos com muito misticismo, inspirando mitos tanto de boas-novas como de maus presságios. Conheça algumas dessas histórias:

  17. O real na psicose

    Directory of Open Access Journals (Sweden)

    Maurício Castejón Herrmann

    2004-06-01

    Full Text Available Este artigo discute a noção de real na psicose, a partir das formulações de Lacan sobre o tema, presentes no Seminário 3 - As Psicoses, no Seminário 20 - Mais, Ainda e no texto Televisão. Considerando-se que a concepção de real tem uma indicação clínica, a hipótese que se formula é a de que a noção de real trabalhada no Seminário 20, Mais, Ainda representa uma continuidade da concepção de real desenvolvida no Seminário 3, As Psicoses

  18. NA48 prototype calorimeter

    CERN Document Server

    1990-01-01

    This is a calorimeter, a detector which measures the energy of particles. When in use, it is filled with liquid krypton at -152°C. Electrons and photons passing through interact with the krypton, creating a shower of charged particles which are collected on the copper ribbons. The ribbons are aligned to an accuracy of a tenth of a millimetre. The folding at each end allows them to be kept absolutely flat. Each shower of particles also creates a signal in scintillating material embedded in the support disks. These flashes of light are transmitted to electronics by the optical fibres along the side of the detector. They give the time at which the interaction occurred. The photo shows the calorimeter at NA48, a CERN experiment which is trying to understand the lack of anti-matter in the Universe today.

  19. Leadeship: na effective relationship

    OpenAIRE

    Sergio Roberto Guimarães Pantoja

    2005-01-01

    Resumo: O presente trabalho tem por objetivo analisar a eficácia da liderança em três instituições de ensino superior em São Luís -MA, sendo a instituição A (particular), a B (pública federal) e a C (pública estadual). Adotou-se os estilos de liderança: democrático, autocrático e liberal, baseando-se na Teoria dos Estilos de Kurt Lewin e seus colaboradores e nas qualidades de liderança (objetividade, compreensão dos outros, flexibilidade, comunicação e autoridade), definidas por Uris A.(196...

  20. Raytracing na GPU

    OpenAIRE

    Straňák, Marek

    2011-01-01

    Raytracing je základnou technikou pro vizualizaci trojrozměrných objektů. Cílem práce je demonstrovat možnost implementace sledovaní paprsků pomocí grafického akcelerátoru.  Popíšem základní algoritmus a jeho modifikovanou verzi, která byla implementována pomocí jazyka CUDA C. Výsledný raytracer je optimalizovaný pro dynamické scény. Pro tento účel byla použita akcelerační struktura KD strom, hierarchické obalové tělesa a přenos dat pomocí PBO. Pro realističtější výstupy byla také implementov...

  1. Comprometimento pulmonar na leptospirose

    Directory of Open Access Journals (Sweden)

    Jorge Eduardo Manhães de Carvalho

    1992-03-01

    Full Text Available Em 23 pacientes com leptospirose apresentando comprometimento pulmonar, internados no Hospital Universitário Antônio Pedro da XJFF, Niterói, hemoptise e hemoptóicos foram observados em 21,7% e 30,4%, respectivajnente. Gasometria arterial revelou hipoxemia e hipocapnia na maioria dos casos. Radiografia de tórax em 15 pacientes mostrou comprometimento alveolar em 60%, comprometimento intersticial-reticular em 6%, padrão misto (alveolar e intersticial em20%e ausência de alterações radiológicas em 14%. A necrópsiade 13 pacientes mostrou edema, congestão e hemorragia nos pulmões em 100% dos casos. A hemorragia foi focal em 46% e difusa em 54% dos casos. Houve formação de membrana hialina em 30% e trombos de fibrina em 46% dos pulmões estudados, o que estabelece o diagnóstico da coagulação intravascular disseminada e a ocorrência da síndrome de angústia respiratória na leptospirose.Tostudy thepulmonary complications in leptospirosis case records of 23 such patients admitted at the Hospital Universitário Antônio Pedro, Universidade Federal Fluminense, Niterói, Brasil, were reviewed. Hemoptysis were seen in 21.7% and sputal blood in 30.4% of patients. Arterial gasometry detected hypoxemia and hypocapnia in most cases. Thoracic radiology showed an alveolar pattern in 60% of the patients, alveolo-interstitial in 20%, interstitial in 6%, and in 14% the lungs were considered to be normal Necropsy of 13 cases showed edema, congestion and hemorrhage in the lungs in all cases. Hyaline membrane was found in 30% and fibrin thrombi in 46% of these cases, resulting in a diagnosis of adult respiratory distress syndrome and acute disseminated intravascular coagulation (consumption coagulopathy in leptospirosis.

  2. A ENGENHARIA NA ESCOLA

    Directory of Open Access Journals (Sweden)

    Valéria Pelizzer Casara

    2015-04-01

    Full Text Available Este projeto teve por objetivo principal mostrar às jovens do ensino médio, como as áreas de exatas e de engenharia podem estar inseridas em situações rotineiras por elas vivenciadas e incentivá-las para ingressarem nessas áreas. O projeto foi executado na escola de ensino Médio Nelson Horostecki na cidade de Chapecó, Santa Catarina. Mostrou-se de forma simples que as áreas de exatas e de engenharia têm aplicações práticas nas nossas vidas. No desenvolvimento do projeto, realizaram-se oficinas na escola cujo tema principal abordado foi o processo de fabricação do chocolate, visto que o mesmo é um produto muito apreciado pelas adolescentes. Dentro dessa temática, foram trabalhadas as questões que envolvem conhecimentos das áreas de exatas e de engenharia, mais especificamente a Engenharia Ambiental. O projeto auxiliou na formação cidadã e também na escolha profissional das meninas. Muitas das alunas participantes nunca haviam tido contato direto com alunos graduandos de cursos na área das exatas. Mais ainda, este projeto oportunizou a aproximação da universidade com a comunidade externa. Palavras-chave: Extensão Universitária, Ciências Exatas e Engenharia, Chocolate, Oficinas.   Engineering in the school Abstract: The main objective of this project was to show high school female students how the exact sciences and engineering can be included in their routine situations encouraging them to entering in these areas. The project was carried out at the Nelson Horostecki High School in Chapecó, Santa Catarina State, Brazil. It was showed in a simple manner how exact sciences and engineering have practical applications in our lives. Workshops were conducted in the school during the execution of the project in which the main subject was the chocolate manufacturing process, since chocolate is a product greatly appreciated by the young female people. Within this matter, the activities were performed using the knowledge of

  3. Valores na escola

    Directory of Open Access Journals (Sweden)

    Menin Maria Suzana De Stefano

    2002-01-01

    Full Text Available Neste texto pretende-se discorrer sobre valores morais na escola e suas implicações para a formação de professores. Para tanto discutir-se-á, em primeiro lugar, e brevemente, o que são valores morais, ou éticos, e como a escola pode situar-se em relação a eles. Em seguida, serão relatadas algumas observações a respeito de valores de professores e práticas daí decorrentes. São comentados resultados de pesquisa que ilustram a transmissão de valores de forma doutrinal e a educação moral e cívica tal como realizada na ditadura militar, e, por outro lado, a posição relativista e/ou de laissez-faire que certas escolas podem adotar, metodologicamente, sobre a educação em valores. Finalmente, defender-se-á a idéia de que é necessária uma discussão sobre valores pelos diversos membros da escola e uma opção por uma metodologia para ensiná-los, seja os professores, em sua formação inicial e continuada, seja os alunos. A teoria de desenvolvimento moral de Jean Piaget será apresentada como uma referência possível para a educação em valores. Exemplos de situações escolares de conflito de valores entre direção, pais e alunos são discutidas para ilustrar como uma escola pode adotar um procedimento democrático de educação em valores, que se apresenta como um terceiro caminho possível de educação moral nas escolas, além das posições doutrinárias ou relativistas.

  4. A CORPOREIDADE NA ESCOLA

    Directory of Open Access Journals (Sweden)

    Márcio Xavier Bonorino Figueiredo

    2008-07-01

    Full Text Available Com este estudo, visa-se a investigar como a escola tem construído um corporeidade para a submissão dos estudantes ao sistema de dominação vigente. Propõe-se, também, a descobrir a corporeidade expressa nas brincadeiras, jogos e desenhos das crianças. Realizaram-se observações do espaço escolar de uma sala de aula durante um ano letivo, bem como duas entrevistas com cada uma das crianças de uma turma de 1ª série do 1º grau, em uma escola pública de periferia. Constatou-se que a escola, através de uma série de normas, explícitas ou implícitas, vai construindo uma corporeidade baseada no individualismo, na massificação e nos privilégios de uma minoria. A análise das brincadeiras, jogos e desenhos infantis revelou que estes veiculam valores contrários àqueles impostos pela escola. Em vista disso, elaborou-se uma proposta incipiente de trabalho corporal que tenha nas brincadeiras, jogos e desenhos das crianças o seu ponto de partida para uma práxis transformadora.

  5. O SUBLIME NA MODERNIDADE

    Directory of Open Access Journals (Sweden)

    Martha de Almeida

    2009-03-01

    Full Text Available A obra Uma investigação filosófica sobre a origem de nossas idéias do sublime e dobelo, do sensualista inglês Edmund Burke (1757, data as origens do sublime na Modernidade. Nosublime ocorre é um prazer ligado à dor, um "horror delicioso" que sentimos quando acreditamosque estamos em perigo sem que isso esteja ocorrendo realmente. Em O mundo como Vontade erepresentação Schopenhauer assume as influências que sofreu de Kant no que diz respeito à suainterpretação sobre o belo e o sublime, porém difere dele quanto à natureza dessa impressão. ParaSchopenhauer a experiência estética pressupõe a dissolução da subjetividade num movimento decontemplação das idéias livre do querer imposto pela vontade individual. As idéias deSchopenhauer influenciaram a estética do Nietzsche de O nascimento da tragédia.

  6. A aposta na filosofia

    Directory of Open Access Journals (Sweden)

    Márcio Suzuki

    2011-12-01

    Full Text Available Para Hume, filosofar é uma atividade semelhante às demais ocupações humanas. A decisão que leva à atividade filosófica é menos resultado de uma argumentação teórica do que fruto de um cálculo prático, que é entendido como uma caça ou um jogo. O objetivo deste trabalho será o de mostrar que no jogo filosófico perde quem joga sério demais. A aposta na filosofia tem que passar pelo bom humor e pela diversão: uma resposta a Pascal?For Hume, philosophy is in itself neither more nor less important than other human activities. On the contrary, it can be explained from its resemblance with game and hunting. If one chooses to dedicate himself to philosophy, his decision is not the consequence of logical reasoning, but depends on practical evaluation, which has something to do with gambling. The following text tries to show that in philosophy, like in other games, the loser will be the one who plays too earnestly. The philosophical game requires good humour and some relaxation: Is this a good answer to Pascal's pari?

  7. Ulogata na endoetelin-1 vo razvojot na dijabeticna nefropatija inducirana so streptozocin

    Directory of Open Access Journals (Sweden)

    Jasmina Trojacanec

    2006-06-01

    Full Text Available Dijabeticnata nefropatija pretstavuva edna od hronicnite mikrovaskularni komplikacii na dijabetot, so multifaktorijalna i ne do kraj rasvetlena etiopatogeneza. So ogled na toa sto kaj pacientite so dijabet, osobeno kaj onie so dijabeticna nefropatija, se najdeni zgolemeni vrednosti na endotelin-1, se pretpostavuva deka istiot moze da ima znacajna uloga vo razvojot na dijabeticnata nefropatija. Osnovna cel na nasata studija bese da se detektiraat promenite vo plazmatskoto nivo na endotelin-1 po eksperimentalno induciran dijabet, i dijabeticna nefropatija kaj staorci so streptozocin. So ogled na dobro poznatite efekti na AKE-inhibitorite, vo ovaa studija go ispituvavme i vlijanieto na enalapril (AKE inhibitor na plazmatskite koncentracii na endotelin-1, kako i negovite efekti vo tretmanot na dijabeti~na nefropatija. Ednokratnata i.p. administracija na streptozocin (STZ predizvika signifikantno zgolemuvanje na plazmatskite koncentracii na endotelin-1, proprateni so jasno izrazeni simptomi i znaci na dijabeticna nefropatija (mikroalbuminurija, zgolemeni urinarni vrednosti na N-acetyl-fl-D-glucosamidase, zgolemeni serumski koncentracii na urea, poliurija. Cetiri nedelniot tretman so enalapril dovede do signifikantno namaluvanje na plazmatskite koncentracii na endotelin-1 i do podobruvanje na simtomite i znacite na dijabeticnata nefropatija. Dobienite rezultati potvrduvaat deka endotelin-1 moze da ima znacajna uloga vo razvojot i progresijata na dijabeticnata nefropatija, a AKE inhibitorite, odnosno enalapril, mozat da ja ublazat i usporat progresijata na dijabeticnata nefropatija

  8. Dificuldades da aprendizagem na leitura

    OpenAIRE

    Nascimento, Solange Oliveira; Trugillo, Edneuza Alves

    2011-01-01

    Este presente artigo propôs verificar os fatores que influenciam no desenvolvimento da aprendizagem na leitura dos alunos da 4º ano no Ensino Fundamental na Escola Municipal Armando Dias no município de Sinop/MT, cujo tema é dificuldade da aprendizagem na leitura. O objetivo do trabalho foi investigar as relações interpessoais em sala de aula e de que forma a professora introduz a leitura nos conteúdos dados aos alunos. Como fundamentação teórica, recorremos a vários autores, entre eles: Enri...

  9. SPOLNO NADLEGOVANJE NA DELOVNEM MESTU

    OpenAIRE

    Rubič, Gašper

    2016-01-01

    V diplomskem delu smo v uvodu predstavili problem spolnega nadlegovanja na delovnem mestu in predstavili podjetje TEKSTIL d.d. V nadaljevanju smo z anketo raziskali, ali problem spolnega nadlegovanja na delovnem mestu v obravnavanem podjetju obstaja in če, kako se nanj odziva okolje. V teoretičnem delu smo nadaljevali in predstavili definicijo spolnega nadlegovanja, ki je kakršna koli oblika nezaželenega verbalnega in neverbalnega ali fizičnega ravnanja spolne narave z učinkom ali nameno...

  10. 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.

  11. Na via do Behemoth

    Directory of Open Access Journals (Sweden)

    Gérard Rabinovitch

    2008-06-01

    Full Text Available O momento nazista permanece um enigma impensado de que a cultura contemporânea continua cativa. O autor levanta a hipótese de que a persistência desse enigma e seus estragos duráveis se devem à insistência dos pensamentos político, sociológico e filosófico em construírem o nazismo à luz da metáfora hobbesiana do Leviatã. Propõe retomar a questão do nazismo sob a perspectiva do Behemoth, antônimo do Leviatã. Para tanto, sugere a necessidade de retornar a Freud e à psicanálise, balizas de um possível novo pensamento do político que escrutine a destrutividade nazista. Propõe ainda sondar as homologias entre nazismo, corjas e máfias, com base na figura da " heroicização da violência" que lhes seria comum. E avança um modelo " econômico" : a quimera, suscetível de capturar o caráter heterotópico e heterocrônico de sua construção criminosa.The paths of Behemoth. The Nazi moment remains as the thoughtless enigma of which contemporary culture is still captive. The author raises the hypothesis where the persistency of this enigma and its durable damages are due to the insistence of the political, social and philosophical thoughts in building the Nazism at the view of the Hobbesian metaphor of Leviathan. It is here proposed to resume the Nazism matter under Behemoth's perspective, antonym to Leviathan. For such, it is suggested a necessity to look back at Freud and the psychoanalysis, structured by a possible new political thought which scrutinizes the destructivity of the Nazism. It is also here proposed to gaze at the homologies between Nazism, mafias and gangs, with a base in the figure of " violence as a heroically act" that are their common ground. The author also advances an economical model: the chimera susceptible to capture the heterotopic and heterochronic character of its criminal construction.

  12. Results from NA61/SHINE

    Directory of Open Access Journals (Sweden)

    Unger M.

    2013-06-01

    Full Text Available In this paper we summarize recent results from NA61/SHINE relevant for heavy ion physics, neutrino oscillations and the interpretation of air showers induced by ultra-high energy cosmic rays.

  13. Risbjerg: Historisk stemmeskred med NA

    DEFF Research Database (Denmark)

    Thomsen, Søren Risbjerg

    2007-01-01

    ANALYSE: NA flytter 12,3 pct. af stemmerne i majs meningsmålinger - historisk mange vælgere på en måned, skriver professor Risbjerg. Udgivelsesdato: 3. juni 2007......ANALYSE: NA flytter 12,3 pct. af stemmerne i majs meningsmålinger - historisk mange vælgere på en måned, skriver professor Risbjerg. Udgivelsesdato: 3. juni 2007...

  14. Na+ recirculation and isosmotic transport.

    Science.gov (United States)

    Larsen, E H; Møbjerg, N

    2006-01-01

    The Na(+) recirculation theory for solute-coupled fluid absorption is an expansion of the local osmosis concept introduced by Curran and analyzed by Diamond & Bossert. Based on studies on small intestine the theory assumes that the observed recirculation of Na(+) serves regulation of the osmolarity of the absorbate. Mathematical modeling reproducing bioelectric and hydrosmotic properties of small intestine and proximal tubule, respectively, predicts a significant range of observations such as isosmotic transport, hyposmotic transport, solvent drag, anomalous solvent drag, the residual hydraulic permeability in proximal tubule of AQP1 (-/-) mice, and the inverse relationship between hydraulic permeability and the concentration difference needed to reverse transepithelial water flow. The model reproduces the volume responses of cells and lateral intercellular space (lis) following replacement of luminal NaCl by sucrose as well as the linear dependence of volume absorption on luminal NaCl concentration. Analysis of solvent drag on Na(+) in tight junctions provides explanation for the surprisingly high metabolic efficiency of Na(+) reabsorption. The model predicts and explains low metabolic efficiency in diluted external baths. Hyperosmolarity of lis is governed by the hydraulic permeability of the apical plasma membrane and tight junction with 6-7 mOsm in small intestine and < or = 1 mOsm in proximal tubule. Truly isosmotic transport demands a Na(+) recirculation of 50-70% in small intestine but might be barely measurable in proximal tubule. The model fails to reproduce a certain type of observations: The reduced volume absorption at transepithelial osmotic equilibrium in AQP1 knockout mice, and the stimulated water absorption by gallbladder in diluted external solutions. Thus, it indicates cellular regulation of apical Na(+) uptake, which is not included in the mathematical treatment.

  15. Dificuldades da aprendizagem na leitura

    Directory of Open Access Journals (Sweden)

    Solange Oliveira Nascimento

    2011-07-01

    Full Text Available Este presente artigo propôs verificar os fatores que influenciam no desenvolvimento da aprendizagem na leitura dos alunos da 4º ano no Ensino Fundamental na Escola Municipal Armando Dias no município de Sinop/MT, cujo tema é dificuldade da aprendizagem na leitura. O objetivo do trabalho foi investigar as relações interpessoais em sala de aula e de que forma a professora introduz a leitura nos conteúdos dados aos alunos. Como fundamentação teórica, recorremos a vários autores, entre eles: Enrique Cártula Fita, Elisabete da Assunção Jóse, Jésus Alonso Tapia, Maria Tereza Coelho e Ruth Caribe da Rocha Drouet. A metodologia usada consistiu na pesquisa qualitativa, no estudo de caso e questionário com perguntas abertas e fechadas aplicadas à professora e três alunos que estão com dificuldades na leitura. Através dos relatos dos sujeitos realizamos um estudo analítico confrontando os dados da pesquisa com os autores principais que fundamentam a mesma. O presente trabalho pretende contribuir e mostrar ao professor em sala de aula a importância de incentivar os alunos a aprenderem a ler com prazer motivando-os a despertar o interesse e gosto pela leitura. Os resultados da investigação revelam que a professora pesquisada está ciente de seu papel e procura meios para enfrentar os problemas existentes em sala de aula, em especial às dificuldades da aprendizagem na leitura e os alunos percebem a importância da leitura e tem vontade em avançar nesse aprendizado.Palavras-chave: educação; dificuldades na aprendizagem. professor; aluno; sala de aula.

  16. Na Deposition on MnO(100)

    Science.gov (United States)

    Feng, Xu; Cox, David F.

    2016-03-01

    Na deposition on the MnO(100) surface was investigated by temperature programmed desorption (TPD), X-ray photoelectron spectroscopy (XPS) and low energy electron diffraction (LEED). Na TPD and XPS results indicate that adsorbed Na interacts strongly with the MnO substrate to form an irreversibly-adsorbed, oxidic Na compound on the surface for coverages up to 1 monolayer (ML). This strongly-bound Na diffuses into the MnO subsurface and bulk at elevated temperatures above 500 K. For Na coverages above 1 ML, metallic Na is present and desorbs from the surface below 500 K. The deposition of Na on MnO(100) follows a Stranski-Krastanov (SK) growth mode, with the formation of metallic Na islands following completion of the first Na monolayer. After Na deposition, the surface exhibits a diffuse (1 × 1) LEED pattern, suggesting the formation of disordered Na overlayers. After heating to 1000 K, the surface presents a (2 × 2) LEED pattern indicating that a surface reconstruction is induced by the diffusion of Na into the near surface region. CO2 can be used as a probe molecule in TPD to distinguish between metallic Na islands and oxidic Na in the first ML, and to indicate when Na that is still observable by XPS goes subsurface.

  17. Jezična analiza lista Naš glas

    OpenAIRE

    2015-01-01

    U radu se analizira jezik Našega glasa (list „Riviere“ – radne organizacije za ugostiteljstvo, turizam, trgovinu i proizvodnju) koji je izlazio u Poreču od 1969. do 1982. godine. Nakon kratkoga osvrta na strukturu, sadržaj i ulogu toga lista te njegov značaj za stanovništvo lokalne zajednice, slijedi prikaz jezičnih zbivanja u vrijeme njegova izlaženja. U žarištu su istraživanja pravopisne, morfološke, sintaktičke, tvorbene, leksičke i stilske karakteristike lista. Rezultati istraživanja poka...

  18. All new for NA62

    CERN Multimedia

    Antonella Del Rosso

    2012-01-01

    This week sees the start of the first run of the new NA62 experiment. This will be a unique opportunity for the collaboration to test its new beam, new detectors and new data acquisition system before the physics run in 2014. Speaking to the Bulletin, the NA62 technical coordinator Ferdinand Hahn shares the many challenges that the various teams faced to be on time for beam. Ready, steady, start!   A Large Angle Veto detector (white) in place in the NA62 decay volume (blue). With components from almost all the detectors in place downstream of the decay point of the mother particles – the kaons – and of the KTAG detector that tags the kaons before they decay, NA62 is ready for its first technical run. This unique run will test all the equipment as well as the trigger and the data acquisition systems. “This year, we will have about five weeks of beam from the SPS before the long shutdown of all the CERN machines,” says Ferdinand Hahn, NA62 Technical Co-...

  19. Corpo e sexualidade na gravidez

    Directory of Open Access Journals (Sweden)

    Natalúcia Matos Araújo

    2012-06-01

    Full Text Available Estudo etnográfico que teve como objetivo compreender como as gestantes vivenciam os processos fisiológicos do seu corpo durante a gestação e a sua repercussão na sexualidade. A pesquisa envolveu sete mulheres residentes em bairro popular de São Paulo. Na coleta de dados, utilizou-se observação participante e entrevista com questões norteadoras. Os dados foram apresentados na forma de narrativa e posteriormente organizados nas categorias: Percebendo as transformações corporais; Convivendo com as mudanças no corpo; Sentimentos e sensações na vida sexual durante a gestação e imaginando o corpo e a sexualidade após a gestação. As mulheres referiram-se às transformações do corpo como desconfortos e expressaram a preocupação de que fossem definitivas. Expressaram o desejo de que, após o parto, o corpo volte a ser como era e que volte a sentir desejo sexual. O reconhecimento destes fatos constitui-se numa ferramenta primordial na adequação das práticas profissionais.

  20. gigapanorama of NA 62 cavern

    CERN Multimedia

    Brice, Maximilien

    2015-01-01

    The image shows the new rare Kaon decay experiment at CERN, called NA62. The NA62 experiment is 270 metres long and includes a 120-metre-long vacuum tank, shown here, housing several of the particle detectors. (Note: the experiment axis is a straight line, the curving of the tank is an optical effect of the photo.) Kaons are particles that decay into lighter elementary particles. The kaon decay processes are mostly well known, except for some very rare decay modes. For example, NA62 is investigating a rare decay predicted by the Standard Model in which a kaon decays into one pion and two neutrinos. This process occurs only once every 10 billion decays. The understanding of such ultra-rare decays are of great importance because they test the Standard Model in energy ranges not accessible by direct measurements. They are therefore complementary to the measurements at the LHC. ultra high definition on demand (photolab@cern.ch).

  1. Alcool e drogas na esquizofrenia

    OpenAIRE

    Marilia Montoya Boscolo

    2000-01-01

    Resumo: O objetivo deste trabalho é estudar o fenômeno do uso de álcool e drogas ilícitas (maconha e cocaína) na esquizoftenia. Trata-se de estudo comparativo, casocontrole, de dois grupos de esquizoftênicos pareados para sexo e idade, que preencheram os critérios diagnósticos do DSMIV para esquizoftenia. O grupo caso é definido por esquizofrênicos que têm história de ter feito uso de álcool, pelo menos no último mês e/ ou história de ter feito uso de drogas (maconha e cocaína), pelo menos al...

  2. Criatividade na Gestalt–terapia

    Directory of Open Access Journals (Sweden)

    Patrícia Albuquerque Lima

    2009-04-01

    Full Text Available Como se conceitua criatividade na teoria da Gestalt–terapia? Qual o papel e a função da criatividade nesta abordagem? O que se considera como um comportamento criativo no senso comum é tão diferente do que compreendemos, na abordagem gestáltica, como criatividade? Estas são algumas das perguntas sobre as quais buscaremos transcorrer ao longo deste artigo. Partimos de simples perguntas, pois talvez um bom recurso para se “tratar” da criatividade seja a curiosidade. Para isto, iremos apresentar a contribuição de alguns autores que discorreram sobre o tema da criatividade em suas obras, iniciando por Kurt Goldstein e sua Teoria Organísmica, que consideramos o principal substrato teórico para se pensar a criatividade na Gestalt–terapia.

  3. The NA48 trigger supervisor

    CERN Document Server

    Arcidiacono, R; Berotto, F; Bertolino, F; Govi, G; Menichetti, E; Sozzi, M

    2000-01-01

    The NA48 experiment aims to measure direct CP violation in the K/sub L//sup 0/ decays system with an accuracy of 2*10/sup -4/. High performances are required to the trigger and acquisition systems. This paper describes the NA48 Trigger Supervisor, a 40 MHz pipelined hardware system which correlates and processes trigger informations from local trigger sources, searching for interesting patterns. The trigger packet include a timestamp information used by the readout systems to retrieve detector data. The design architecture and functionality during 98 data taking are described. (5 refs).

  4. Criatividade na Gestalt–terapia

    OpenAIRE

    Patrícia Albuquerque Lima

    2009-01-01

    Como se conceitua criatividade na teoria da Gestalt–terapia? Qual o papel e a função da criatividade nesta abordagem? O que se considera como um comportamento criativo no senso comum é tão diferente do que compreendemos, na abordagem gestáltica, como criatividade? Estas são algumas das perguntas sobre as quais buscaremos transcorrer ao longo deste artigo. Partimos de simples perguntas, pois talvez um bom recurso para se “tratar” da criatividade seja a curiosidade. Para isto, iremos apresentar...

  5. 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).

  6. Lamb shifts and hyperfine structure in 6Li+ and 7Li+: Theory and experiment

    DEFF Research Database (Denmark)

    Riis, E.; Sinclair, A. G.; Poulsen, Ove;

    1994-01-01

    High-precision laser-resonance measurements accurate to +/-0.5 MHz, or better are reported for transitions among the 1s2s S-3(1)-1s2p P-3(J) hyperfine manifolds for each of J = 0, 1, and 2 in both Li-6(+) and Li-7(+). A detailed analysis of hyperfine structure is performed for both the S and P...... states, using newly calculated values for the magnetic dipole and electric quadrupole coupling constants, and the hyperfine shifts subtracted from the measurements. The resulting transition frequencies are then analysed on three different levels. First, the isotope shifts in the fine-structure splittings....... The accuracy of 11 parts per million is the best two-electron Lamb shift measurement in the literature, and is comparable to the accuracies achieved in hydrogen. Theoretical contributions to the two-electron Lamb shift are discussed, including terms of order (alpha Z)(4) recently obtained by Chen, Cheng...

  7. Geometric Scaling of Efimov States in a 6Li - 133Cs Mixture

    Science.gov (United States)

    Tung, Shih-Kuang; Jiménez-García, Karina; Johansen, Jacob; Parker, Colin V.; Chin, Cheng

    2014-12-01

    In few-body physics, Efimov states are an infinite series of three-body bound states that obey universal discrete scaling symmetry when pairwise interactions are resonantly enhanced. Despite abundant reports of Efimov states in recent cold atom experiments, direct observation of the discrete scaling symmetry remains an elusive goal. Here we report the observation of three consecutive Efimov resonances in a heteronuclear Li-Cs mixture near a broad interspecies Feshbach resonance. The positions of the resonances closely follow a geometric series 1, λ , λ2. The observed scaling constant λexp=4.9 (4 ) is in good agreement with the predicted value of 4.88.

  8. Search for the Halo Effect in the ~1H(~6He, ~6Li)n Reaction

    Institute of Scientific and Technical Information of China (English)

    2001-01-01

    The experiment is carried out using the secondary beam facility of the HI-13 tandem accelerator at China Institute of Atomic Energy, Beijing. The experimental setup is similar to the previously illustrated. A 7Li beam with energy of 44 MeV from the tandem impinged on a D2 gas cell at pressure of 1.5×105 Pa, in which 6He ions are produced via 2H(7Li, 6He)3He reaction. The front and rear

  9. Determination of $^{6}Li - ^{4}He$ interaction from multi-energy scattering data

    CERN Document Server

    MacIntosh, R S; Kukulin, V I

    1999-01-01

    We present the first successful potential model description of Li-6 -- He-4 scattering. The differential cross-sections for three energies and the vector analyzing powers for two energies were fitted by a single potential with energy dependent imaginary components. An essential ingredient is a set of Majorana terms in each component. The potential was determined using a recently developed direct data-to-potential inversion method which is a generalisation of the IP S-matrix-to-potential inversion algorithm. We discuss the problems related to this phenomenological approach, and discuss the relationship of our results to existing and future theories.

  10. Nucleon polarization in three-body models of polarized \\bbox{^6}Li

    CERN Document Server

    Schellingerhout, N W; Coon, S A; Adam, R M

    1993-01-01

    Just as $^3\\roarrow{\\rm He}$ can be approximately characterized as a polarized neutron target, polarized \\Li6D has been advocated as a good {\\em isoscalar} nuclear target for the extraction of the polarized gluon content of the nucleon. The original argument rests upon a presumed ``alpha + deuteron'' picture of \\Li6, with the polarization of the nucleus carried by the polarization of the deuteron. We have calculated the polarization of the constituents of \\Li6 as a three-body bound state of $\\alpha + n + p$ interacting with local potentials fitted to the scattering data. It is necessary to include partial waves up to $j=17/2$ (75 channels, or, when including the $T=1$ state, 150 channels) in the Faddeev equations before the energy eigenvalue converges. The longitudinal formfactors are then described well by the wave function. Various combinations of $\\alpha$N and NN strong and Coulomb potentials yield a straight line in the charge radius {\\em vs.} energy plane which, unlike those of previous calculations, pas...

  11. Development and Characterization of 6Li-doped Liquid Scintillator Detectors for PROSPECT

    Science.gov (United States)

    Gaison, Jeremy; Prospect Collaboration

    2016-09-01

    PROSPECT, the Precision Reactor Oscillation and Spectrum experiment, is a phased reactor antineutrino experiment designed to search for eV-scale sterile neutrinos via short-baseline neutrino oscillations and to make a precision measurement of the 235U reactor antineutrino spectrum. A multi-ton, optically segmented detector will be deployed at Oak Ridge National Laboratory's (ORNL) High Flux Isotope Reactor (HFIR) to measure the reactor spectrum at baselines ranging from 7-12m. A two-segment detector prototype with 50 liters of active liquid scintillator target has been built to verify the detector design and to benchmark its performance. In this presentation, we will summarize the performance of this detector prototype and describe the optical and energy calibration of the segmented PROSPECT detectors.

  12. NA60 frees the quarks

    CERN Multimedia

    2003-01-01

    Fitted with new state-of-the-art silicon detectors, NA60 is prepared to study the phase transition from confined hadronic matter to a deconfined (free) quark-gluon plasma, a state of matter which probably existed an instant after the Big Bang.

  13. NA62: Hidden Sector Physics

    CERN Document Server

    Cesarotti, Carissa Joyce

    2016-01-01

    Modern experimental physics is often probing for new physics by either finding deviations from predictions on extremely precise measurements, or by looking for a new signal that cannot be explained with existing models. The NA62 experiment at CERN does the former by measuring the ultra-rare decay $K^+ \\rightarrow \\pi^+ \

  14. Li Na Aces French Open

    Institute of Scientific and Technical Information of China (English)

    2011-01-01

    Chinese tennis player becomes the first Asian to win a Grand Slam singles title Chinese tennis player Li Na beat defending champion Francesca Schiavone from Italy,6-4,7-6,on the clay court at Roland Garros,winning the 2011 French Open Tennis Tournament on June 4.She made history by becoming the first Chinese to win a grand slam singles title.

  15. Astrocytes generate Na+-mediated metabolic waves.

    Science.gov (United States)

    Bernardinelli, Yann; Magistretti, Pierre J; Chatton, Jean-Yves

    2004-10-12

    Glutamate-evoked Na+ increase in astrocytes has been identified as a signal coupling synaptic activity to glucose consumption. Astrocytes participate in multicellular signaling by transmitting intercellular Ca2+ waves. Here we show that intercellular Na+ waves are also evoked by activation of single cultured cortical mouse astrocytes in parallel with Ca2+ waves; however, there are spatial and temporal differences. Indeed, maneuvers that inhibit Ca2+ waves also inhibit Na+ waves; however, inhibition of the Na+/glutamate cotransporters or enzymatic degradation of extracellular glutamate selectively inhibit the Na+ wave. Thus, glutamate released by a Ca2+ wave-dependent mechanism is taken up by the Na+/glutamate cotransporters, resulting in a regenerative propagation of cytosolic Na+ increases. The Na+ wave gives rise to a spatially correlated increase in glucose uptake, which is prevented by glutamate transporter inhibition. Therefore, astrocytes appear to function as a network for concerted neurometabolic coupling through the generation of intercellular Na+ and metabolic waves.

  16. Europlanet NA2 Science Networking

    Science.gov (United States)

    Harri, Ari-Matti; Szego, Karoly; Genzer, Maria; Schmidt, Walter; Krupp, Norbert; Lammer, Helmut; Kallio, Esa; Haukka, Harri

    2013-04-01

    Europlanet RI / NA2 Science Networking [1] focused on determining the major goals of current and future European planetary science, relating them to the Research Infrastructure that the Europlanet RI project [2] developed, and placing them in a more global context. NA2 also enhanced the ability of European planetary scientists to participate on the global scene with their own agenda-setting projects and ideas. The Networking Activity NA2 included five working groups, aimed at identifying key science issues and producing reference books on major science themes that will bridge the gap between the results of present and past missions and the scientific preparation of the future ones. Within the Europlanet RI project (2009-2012) the NA2 and NA2-WGs organized thematic workshops, an expert exchange program and training groups to improve the scientific impact of this Infrastructure. The principal tasks addressed by NA2 were: • Science activities in support to the optimal use of data from past and present space missions, involving the broad planetary science community beyond the "space club" • Science activities in support to the preparation of future planetary missions: Earth-based preparatory observations, laboratory studies, R&D on advanced instrumentation and exploration technologies for the future, theory and modeling etc. • Develop scientific activities, joint publications, dedicated meetings, tools and services, education activities, engaging the public and industries • Update science themes and addressing the two main scientific objectives • Prepare and support workshops of the International Space Science Institute (ISSI) in Bern and • Support Trans National Activities (TNAs), Joined Research Activities (JRAs) and the Integrated and Distributed Information Service (IDIS) of the Europlanet project These tasks were achieved by WG workshops organized by the NA2 working groups, by ISSI workshops and by an Expert Exchange Program. There were 17 official WG

  17. Verdade na Cena, Verdade na Vida: Boal e Stanislavski

    Directory of Open Access Journals (Sweden)

    Antonia

    2015-04-01

    Full Text Available À luz do conceito de verdade cênica, o presente artigo discute a influência do método Stanislavski nos primeiros experimentos no seio do Teatro Arena de São Paulo e também aponta rastros do mestre russo nos princípios da Poética do Oprimido de Augusto Boal. O objetivo primordial consiste em incentivar a construção de espetáculos-fórum, partindo de um trabalho com rigor físico e detalhamento psicológico stanislavskianos. Trabalho este, que pode ser desenvolvido na lógica interna do processo, na fase que precede a todo produto de criação, antes da intervenção do espectador e no âmbito de montagens profissionais de teatro-fórum, em projetos mais duradouros.

  18. NA

    OpenAIRE

    1994-01-01

    Significant research in high performance analog-to-digital converters (ADCs) has been directed at retaining part of the high-speed flash ADC architecture, while reducing the total number of comparators in the circuit. The symmetrical number system (SNS) can be used to preprocess the analog input signal, reducing the number of comparators and thus reducing the chip area and power consumption of the ADC. This thesis examines a Very Large Scale Integrated (VLSI) design for a folding circuit for ...

  19. Kolesarske poti in prostorski razvoj na Ptuju

    OpenAIRE

    Novak, Matjaž

    2017-01-01

    Diplomska naloga Kolesarske poti in prostorski razvoj na Ptuju govori o kolesarjenju kot alternativi osebnemu avtomobilu za dnevne vožnje na delo, v šolo ali po opravkih. Predstavljene so prednosti in slabosti kolesarjenja ter primerjava med kolesom in osebnim avtomobilom, predvsem na kratkih razdaljah, kjer lahko kolo več kot uspešno nadomesti uporabo osebnega avtomobila. V diplomski nalogi je prav tako podrobno predstavljena kolesarska infrastruktura ter pravilno načrtovanje gradnje kolesar...

  20. Hrvatska milja na starim kartama

    Directory of Open Access Journals (Sweden)

    Marina Viličić

    2016-06-01

    Full Text Available Karta Stjepana Glavača iz 1673. godine vrijedan je i jedinstven primjerak hrvatske kartografske baštine. Na njoj je ucrtana hrvatska milja kojoj nema traga na kartama izrađenima prije Glavačeve karte. Više autora spominje vrijednost duljine hrvatske milje, ali nisu suglasni s iznosom njezine vrijednosti. Za potrebe ovoga rada, pored kopije Glavačeve karte pribavljene su i istražene kopije karata Janeza Vajkarda Valvasora iz 1689., Giacoma Cantellija da Vignole iz 1690., Antuna Belavića iz 1739. i karta Kraljevinâ Dalmacije, Hrvatske i Slavonije… iz 1746. na kojima je, pored ostalih milja, ucrtana i hrvatska milja. S pomoću tih ucrtanih milja izračunan je odnos između hrvatske i njemačke milje, zatim talijanske i hrvatske milje te potom francuske i hrvatske milje. Pored tih odnosa, dan je i pregled odnosa hrvatske milje i nekih drugih milja. Utvrđeno je da je duljina hrvatske milje jednaka 1/10 duljine ekvatorskog stupnja. Duljina hrvatske milje za Zemljin radijus R = 6371 km iznosi 11 120 m, odnosno približno 11 km.

  1. Corpo e velhice na contemporaneidade

    Directory of Open Access Journals (Sweden)

    Gabriela Felten da Maia

    2014-04-01

    Full Text Available A inegável atenção dada ao corpo na sociedade inspirou a construção deste trabalho, visto que os imperativos atuais são a beleza, a forma e o vigor. A velhice e a inexorabilidade da morte apresentam-se para este ideal como incômodos que devem ser afastados através de diversos hábitos "saudáveis" e “rejuvenescedores”, como a ginástica, os cosméticos, as vitaminas, procedimentos estético-cirúrgicos, entre outros. O modo de “ser velho”, então, passa a ser configurado não mais por estereótipos negativos, mas a partir de um ethos em que os idosos são apresentados como saudáveis, joviais, engajados, produtivos e autoconfiantes. São corpos que ultrapassam as marcas do tempo, atléticos, firmes e lisos. Logo, aqueles que não aderem a este ethos podem tornar-se desviantes, estranhos, velhos, ultrapassados e precisam, portanto, serem descartados ou escamoteados. Tendo em vista estas questões, o presente trabalho propõe-se a discutir sobre o tema velhice, corpo e sociedade, na tentativa de problematizar sobre os atuais modos de subjetivação e o envelhecimento na contemporaneidade.

  2. Homocisteína Homocysteine

    Directory of Open Access Journals (Sweden)

    Lindalva Batista Neves

    2004-10-01

    Full Text Available A homocisteína, formada a partir da metionina hepática, é metabolizada nas vias de desmetilação e de transulfuração, sendo que seus valores plasmáticos e urinários refletem a síntese celular. Sua determinação, realizada em jejum e após sobrecarga de metionina, caracteriza as diferenças dessas vias metabólicas, principalmente quando de natureza genética. A hiper-homocisteinemia tem sido associada a maior risco de eventos aterotrombóticos, e a literatura sugere associação causal, independente de outros fatores de risco para doença arterial. Diminuição da homocisteína plasmática para valores normais é seguida de redução significante na incidência de doença aterotrombótica. A relação entre homocisteína e o fígado vem adquirindo importância nos dias atuais, uma vez que alterações das lipoproteínas e da depuração de metionina são comuns em pacientes com doença hepática crônica (hepatocelular e canalicular. O tratamento da hiper-homocisteinemia fundamenta-se na suplementação alimentar e medicamentosa de ácido fólico e vitaminas B6 e B12.Homocysteine, formed from hepatic methionine, is metabolized through the pathways of demethylation and transsulfuration. Its plasmatic and urinary values reflect the cell synthesis. Its determination after fasting and increased infusion of methionine shows the differences of these two metabolic pathways, mainly when it is related to genetic diseases. Hyperhomocysteinemia has been associated with a higher risk of vascular thrombotic events. Several authors suggest a causal relationship between these events independently of other risk factors for vascular diseases. Decrease in plasmatic homocysteine to normal levels is followed by a significant reduction on the incidence of vascular thrombotic events. The correlation between the liver and homocysteine is becoming more important because of the recent findings that alterations of lipoproteins and methionine clearance are

  3. Utjecaj načina zrenja na udjel vode u bezmasnoj tvari i na udjel masti u siru Trapistu

    OpenAIRE

    Kirin, Slavko

    2001-01-01

    U radu je istraživan utjecaj načina zrenja na udjel vode u bezmasnoj tvari i na udjel masti u siru Trapistu. U sadašnjoj proizvodnji (Lura, Tvornica Bjelovar), sir Trapist zrije na prirodan način s oblikovanjem kore, te vakuumski upakiran u termoskupljajuče plastične vrećice, čime se dobije sir bez kore. Utvrđeno je da spomenuti načini zrenja uvjetuju signifikantne razlike u udjelu vode u bezmasnoj tvari sira. On je 5,34 % viši kod sira Trapista u vrećici u odnosu na sir Trapist s korom. Udje...

  4. Na+,K+-ATPase Na+ affinity in rat skeletal muscle fiber types

    DEFF Research Database (Denmark)

    Kristensen, Michael; Juel, Carsten

    2010-01-01

    Previous studies in expression systems have found different ion activation of the Na(+)/K(+)-ATPase isozymes, which suggest that different muscles have different ion affinities. The rate of ATP hydrolysis was used to quantify Na(+),K(+)-ATPase activity, and the Na(+) affinity of Na(+),K(+)-ATPase...

  5. A Perspectiva de estudos sobre os sujeitos na Arquivologia, na Biblioteconomia e na Museologia

    Directory of Open Access Journals (Sweden)

    Carlos Alberto Ávila Araújo

    2015-01-01

    Full Text Available Arquivologia, Biblioteconomia e Museologia se constituíram, como disciplinas científicas, no final do século XIX, a partir da consolidação de um modelo custodial patrimonialista e, depois, com sua superação a partir de duas perspectivas: uma funcionalista e outra crítica. Posteriormente, uma outra tradição de pesquisa se desenvolveu: estudos realizados a partir do ponto de vista dos sujeitos (usuários, públicos que se relacionam com as instituições arquivo, biblioteca, museu, e que experimentam seus espaços e se apropriam dos conteúdos de seus acervos. O objetivo deste texto é analisar o desenvolvimento desta perspectiva na Arquivologia, na Biblioteconomia e na Museologia, bem como defender a importância de um diálogo maior entre os achados de pesquisa realizados neste âmbito em cada uma das três áreas analisadas.

  6. NaCl Potentiates Human Fibrocyte Differentiation

    OpenAIRE

    Nehemiah Cox; Darrell Pilling; Gomer, Richard H.

    2012-01-01

    Excessive NaCl intake is associated with a variety of fibrosing diseases such as renal and cardiac fibrosis. This association has been attributed to increased blood pressure as the result of high NaCl intake. However, studies in patients with high NaCl intake and fibrosis reveal a connection between NaCl intake and fibrosis that is independent of blood pressure. We find that increasing the extracellular concentration of NaCl to levels that may occur in human blood after high-salt intake can p...

  7. The hydrogen storage properties of Na decorated small boron cluster B6Na8

    Science.gov (United States)

    Tang, Chunmei; Wang, Zhiguo; Zhang, Xue; Wen, Ninghua

    2016-09-01

    The binding energy of the Na atoms to the hollow sites of the B6 cage is larger than the experimental cohesive energy of bulk Na, so the clustering of Na atoms can be avoided. The polarization interaction dominates the adsorption of H2 by the B6Na8 cluster. The Na-coated B6Na8sbnd B8sbnd B6Na8 complex with the dispersive Na atoms and four H2 molecules adsorbed per Na can serve as better building blocks of polymers than the (B6Na8)2 dimer. These findings suggest a new route to design cluster-assembled hydrogen storage materials based on sp2-terminated boron chains.

  8. Conversion and Distribution of Lead and Tin in NaOH-NaNO3 Fusion Process

    Science.gov (United States)

    Liu, Jingxin; Guo, Xueyi

    2017-04-01

    Oxidizing alkali fusion process has been studied to extract amphoteric metals. Transformation and distribution behaviors of typical amphoteric metals Pb and Sn in the NaOH-NaNO3 fusion process are systemically studied by theoretical analysis and experimental verification done in this work. Functions of NaOH and NaNO3 in the fusion process were also investigated. The results show the fused products, Na2PbO3 and Na2SnO3, are captured in the flux, and Na2PbO4 is speculated to reduce to Pb(II) in the following leaching process. By measuring solubility data of NaOH-Na2SnO3-PbO-H2O system, a strategy of crystallization is proposed to separate Sn with Pb in concentrated alkaline solution, and slice Na2Sn(OH)6 is obtained as a product.

  9. Silicene for Na-ion battery applications

    KAUST Repository

    Zhu, Jiajie

    2016-08-19

    Na-ion batteries are promising candidates to replace Li-ion batteries in large scale applications because of the advantages in natural abundance and cost of Na. Silicene has potential as the anode in Li-ion batteries but so far has not received attention with respect to Na-ion batteries. In this context, freestanding silicene, a graphene-silicene-graphene heterostructure, and a graphene-silicene superlattice are investigated for possible application in Na-ion batteries, using first-principles calculations. The calculated Na capacities of 954mAh/g for freestanding silicene and 730mAh/g for the graphenesilicene superlattice (10% biaxial tensile strain) are highly competitive and potentials of >0.3 V against the Na/Na potential exceed the corresponding value of graphite. In addition, the diffusion barriers are predicted to be <0.3 eV.

  10. Silicene for Na-ion battery applications

    Science.gov (United States)

    Zhu, Jiajie; Schwingenschlögl, Udo

    2016-09-01

    Na-ion batteries are promising candidates to replace Li-ion batteries in large scale applications because of the advantages in natural abundance and cost of Na. Silicene has potential as the anode in Li-ion batteries but so far has not received attention with respect to Na-ion batteries. In this context, freestanding silicene, a graphene-silicene-graphene heterostructure, and a graphene-silicene superlattice are investigated for possible application in Na-ion batteries, using first-principles calculations. The calculated Na capacities of 954 mAh/g for freestanding silicene and 730 mAh/g for the graphene-silicene superlattice (10% biaxial tensile strain) are highly competitive and potentials of \\gt 0.3 {{V}} against the Na{}+/Na potential exceed the corresponding value of graphite. In addition, the diffusion barriers are predicted to be \\lt 0.3 {eV}.

  11. Docência na universidade: professores inovadores na USP

    Directory of Open Access Journals (Sweden)

    Chamlian Helena Coharik

    2003-01-01

    Full Text Available O artigo trata de pesquisa realizada com um grupo de professores inovadores da Universidade de São Paulo tendo como objetivo procurar subsídios para a formação do professor universitário. Esses docentes foram entrevistados, solicitando que detalhassem melhor suas experiências inovadoras; explicassem as razões pelas quais haviam introduzido modificações em sua forma de trabalho; explicitassem as relações entre sua atividade de docência e de pesquisa, expressassem o papel que atribuíam ao ensino na universidade, bem como a forma pela qual sua trajetória acadêmica havia se cumprido até então. A diversidade de experiências relatadas e, ao mesmo tempo, a convergência de visões a respeito de suas funções de ensino e de pesquisa na universidade permitem-nos afirmar que, mais do que uma formação pedagógica específica, a sensibilização para as dificuldades do ensino e a valorização institucional dessa atividade consistiriam em grande avanço para a formação do professor.

  12. Pneumonia bacteriana adquirida na comunidade

    OpenAIRE

    Machado, Lais Del Prá Netto

    2015-01-01

    Dissertação (mestrado) - Universidade Federal de Santa Catarina, Centro de Ciências da Saúde, Programa de Pós-Graduação em Farmácia, Florianópolis, 2015. A pneumonia pode ser causada por diversos microrganismos e classificada de forma abrangente, havendo poucos e frágeis estudos clínicos e epidemiológicos sobre pneumonias adquiridas na comunidade (PACs). Os patógenos mais frequentes nas PACs são Streptococcus pneumoniae e Haemophilus influenzae (em pneumonias típicas) e Mycoplasma pneumoni...

  13. New results from NA49

    CERN Document Server

    Afanasiev, S V; Bächler, J; Barna, D; Barnby, L S; Bartke, Jerzy; Barton, R A; Behler, M; Betev, L; Bialkowska, H; Billmeier, A; Blume, C; Blyth, C O; Boimska, B; Botje, M; Bracinik, J; Brady, F P; Bramm, R; Brun, R; Buncic, P; Carr, L; Cebra, D; Cerny, V; Cooper, G E; Cramer, J G; Csató, P; Dinkelaker, P; Eckardt, V; Eckhardt, F; Ferenc, D; Filip, P; Fischer, H G; Foder, Z; Foka, P Y; Freund, P; Friese, V; Gál, J; Ganz, R E; Gazdzicki, M; Georgopoulos, G; Gladysz-Dziadus, E; Harris, J W; Hegyi, S; Höhne, C; Igo, G; Jacobs, P; Jones, P G; Kadija, K; Kolesnikov, V I; Kollegger, T; Kowalski, M; Kraus, I; Kreps, M; Lasiuk, B; Van Leeuwen, M; Lévai, Peter; Malakhov, A I; Margetis, S; Markert, C; Mayes, B W; Melkumov, G L; Mischke, A; Molnár, J; Nelson, J M; Odyniec, Grazyna Janina; Oldenburg, M; Pálla, G; Panagiotou, A D; Perl, K; Petridis, A; Pikna, M; Pinsky, L; Poskanzer, A M; Prindle, D J; Pühlhofer, F; Putschke, J; Reid, J G; Renfordt, A; Retyk, W; Ritter, H G; Röhrich, D; Roland, C; Roland, G; Rybicki, A; Sammer, T; Sann, H; Schäfer, E; Schmitz, N; Seyboth, P; Siklér, F; Sitár, B; Skrzypczak, E; Snellings, R; Squier, G T A; Stock, Reinhard; Ströbele, H; Susa, T; Szentpétery, I; Sziklai, J; Toy, M; Trainor, T A; Trentalange, S; Ullrich, T S; Varga, D; Vassiliou, Maria; Veres, G I; Vesztergombi, G; Voloshin, S A; Vranic, D; Wang, F; Weerasundara, D D; Wenig, S; Wetzler, A; Whitten, C; Xu, N; Yates, T A; Koo, I K; Zaranek, J; Zimányi, J

    2002-01-01

    Recent results of the NA49 experiment are presented. These cover first results on pion and kaon production, HBT, and charge fluctuations from Pb+Pb reactions at 40 AGeV and their comparison to 158 AGeV beam energy. Furthermore a study on baryon number transfer in p+p, centrality selected p+Pb and Pb+Pb collisions at 158 AGeV and new results on the system size dependence of kaon yields, including C+C and Si+Si data, are presented. Additionally, a first result on Lambda Lambda correlations is shown. (11 refs).

  14. The NA52 strangelet search

    CERN Document Server

    Weber, M; Baglin, C; Beck, H P; Borer, K; Bussière, A; Elsener, K; Gorodetzky, P; Guillaud, J P; Kabana, S; Klingenberg, R; Lehmann, G; Lindén, T; Lohmann, K D; Mommsen, R K; Moser, U; Pretzl, Klaus P; Schacher, J; Spiwoks, R; Tuominiemi, Jorma

    2001-01-01

    The NA52 experiment searches for long-lived charged strangelets in 158 a GeV c/sup -1/ Pb+Pb collisions at CERN SPS. The experiment is able to identify single particles coming from the collisions at p/sub t/=0. We collected 10/sup 13/ Pb+Pb interactions looking for negatively charged strangelets and 3*10/sup 11/ Pb+Pb interactions for positively charged ones. No evidence for the production of strangelets has been observed. We present here resulting experimental differential and total upper production limits. (8 refs).

  15. Identidades Homossexuais na Territorialidade Tradicionalista

    Directory of Open Access Journals (Sweden)

    Edipo Djavan dos Reis Göergen

    2015-12-01

    Full Text Available Este artigo apresenta o debate teórico que sustenta a pesquisa de mestrado desenvolvida pelo autor. Tendo por base suas vivências em contextos de tradicionalismo gaúcho, o autor deste trabalho tem percebido a grande quantidade de homossexuais, ou indivíduos que se auto-denominam não-heterossexuais, integrando as atividades artísticas do Movimento Tradicionalista Gaúcho, ou a territorialidade tradicionalista. Interessado em investigar tal fenômeno, o autor tem desenvolvido o projeto de pesquisa “Os Espaços Paradoxais de Relações Homoeróticas na Territorialidade Tradicionalista”, sob orientação do prof. Dr. Benhur Pinós da Costa, no Programa de Pós-Graduação em Geografia (UFSM. Para que essa pesquisa seja realizada, levam-se em conta as relações de gênero e de sexualidade que estão envolvidas no tema. Dessa forma, por ainda se tratarem de temáticas tidas como insignificantes na sociedade em geral e marginalizadas no campo científico, para que o presente trabalho fosse empreendido, buscou-se amparo teórico nas geografias feministas e queer, segmentos contemporâneos da ciência geográfica.

  16. Identidades Homossexuais na Territorialidade Tradicionalista

    Directory of Open Access Journals (Sweden)

    Edipo Djavan dos Reis Göergen

    2015-12-01

    Full Text Available Este artigo apresenta o debate teórico que sustenta a pesquisa de mestrado desenvolvida pelo autor. Tendo por base suas vivências em contextos de tradicionalismo gaúcho, o autor deste trabalho tem percebido a grande quantidade de homossexuais, ou indivíduos que se auto-denominam não-heterossexuais, integrando as atividades artísticas do Movimento Tradicionalista Gaúcho, ou a territorialidade tradicionalista. Interessado em investigar tal fenômeno, o autor tem desenvolvido o projeto de pesquisa “Os Espaços Paradoxais de Relações Homoeróticas na Territorialidade Tradicionalista”, sob orientação do prof. Dr. Benhur Pinós da Costa, no Programa de Pós-Graduação em Geografia (UFSM. Para que essa pesquisa seja realizada, levam-se em conta as relações de gênero e de sexualidade que estão envolvidas no tema. Dessa forma, por ainda se tratarem de temáticas tidas como insignificantes na sociedade em geral e marginalizadas no campo científico, para que o presente trabalho fosse empreendido, buscou-se amparo teórico nas geografias feministas e queer, segmentos contemporâneos da ciência geográfica.

  17. NaCl potentiates human fibrocyte differentiation.

    Science.gov (United States)

    Cox, Nehemiah; Pilling, Darrell; Gomer, Richard H

    2012-01-01

    Excessive NaCl intake is associated with a variety of fibrosing diseases such as renal and cardiac fibrosis. This association has been attributed to increased blood pressure as the result of high NaCl intake. However, studies in patients with high NaCl intake and fibrosis reveal a connection between NaCl intake and fibrosis that is independent of blood pressure. We find that increasing the extracellular concentration of NaCl to levels that may occur in human blood after high-salt intake can potentiate, in serum-free culture conditions, the differentiation of freshly-isolated human monocytes into fibroblast-like cells called fibrocytes. NaCl affects the monocytes directly during their adhesion. Potassium chloride and sodium nitrate also potentiate fibrocyte differentiation. The plasma protein Serum Amyloid P (SAP) inhibits fibrocyte differentiation. High levels of extracellular NaCl change the SAP Hill coefficient from 1.7 to 0.8, and cause a four-fold increase in the concentration of SAP needed to inhibit fibrocyte differentiation by 95%. Together, our data suggest that NaCl potentiates fibrocyte differentiation. NaCl-increased fibrocyte differentiation may thus contribute to NaCl-increased renal and cardiac fibrosis.

  18. NaCl potentiates human fibrocyte differentiation.

    Directory of Open Access Journals (Sweden)

    Nehemiah Cox

    Full Text Available Excessive NaCl intake is associated with a variety of fibrosing diseases such as renal and cardiac fibrosis. This association has been attributed to increased blood pressure as the result of high NaCl intake. However, studies in patients with high NaCl intake and fibrosis reveal a connection between NaCl intake and fibrosis that is independent of blood pressure. We find that increasing the extracellular concentration of NaCl to levels that may occur in human blood after high-salt intake can potentiate, in serum-free culture conditions, the differentiation of freshly-isolated human monocytes into fibroblast-like cells called fibrocytes. NaCl affects the monocytes directly during their adhesion. Potassium chloride and sodium nitrate also potentiate fibrocyte differentiation. The plasma protein Serum Amyloid P (SAP inhibits fibrocyte differentiation. High levels of extracellular NaCl change the SAP Hill coefficient from 1.7 to 0.8, and cause a four-fold increase in the concentration of SAP needed to inhibit fibrocyte differentiation by 95%. Together, our data suggest that NaCl potentiates fibrocyte differentiation. NaCl-increased fibrocyte differentiation may thus contribute to NaCl-increased renal and cardiac fibrosis.

  19. Micotoxinas e Micotoxicoses na Avicultura

    Directory of Open Access Journals (Sweden)

    Santurio JM

    2000-01-01

    Full Text Available Esta revisão tem como objetivo principal mostrar, baseado em dezenas de pesquisas realizadas, os efeitos tóxicos das micotoxinas aflatoxinas, tricotecenos, zealenona e fumonisinas sobre o desempenho das aves. O descobrimento das propriedades hepatotóxicas e hepatocarcinogênicas de algumas linhagens de Aspergillus flavus e A. parasiticus em perus, na Inglaterra, no início da década de 1960, seguida pela elucidação da estrutura de seus metabólitos tóxicos, as aflatoxinas, deu novo enfoque e prioridade para a pesquisa sobre micotoxinas. Análises de aflatoxinas realizadas no Laboratório de Análises Micotoxicológicas (LAMIC da Universidade Fedaral de Santa Maria, entre os anos de 1986 e janeiro de 2000, em 15.600 amostras de alimentos destinados principalmente ao consumo animal, demonstram que no milho analisado, 41,9% das amostras estavam contaminadas por aflatoxinas. Em surtos de aflatoxicose no campo, uma das características mais marcantes é a má absorção que se manifesta como partículas de ração mal digeridas na excreta das aves. Também observa-se, em frangos e poedeiras que recebem AFL, extrema palidez das mucosas e pernas. Dietas deficientes em riboflavina ou colecalciferol (vit. D tornaram frangos sensíveis, nos índices de desenvolvimento corporal, a concentrações muito baixas de AFL. O efeito aflatoxina nos frangos é maior na fase inicial de crescimento, ou seja, quando as aves ingeriram aflatoxina nos primeiros 21 dias de vida, e quanto maior o nível de stress do lote, menor a quantidade de AFL para afetar negativamente seu desempenho, seja na produção de carne ou de ovos. As principais micotoxinas do grupo dos tricotecenos são: toxina T-2; deoxynivalenol (DON; diacetoxyscirpenol (DAS, todas produzidas através de diversas espécies de fungos do gênero Fusarium. Além dos tricotecenos, o fusarium também pode produzir zearalenona e fumonisinas. Dessas fusarium-toxinas, somente toxina T-2 gera patologias s

  20. Fotografia na Imprensa: conflitos na câmara escura

    Directory of Open Access Journals (Sweden)

    José Lúcio da Silva Menezes

    2014-07-01

    Full Text Available Este artigo recupera o teor ideológico do discurso que a Revista Veja elaborou sobre a classe trabalhadora que emergiu no cenário brasileiro, no final da década de 1970. O destaque dado aos trabalhadores como temática central resgatada, deve-se aos movimentos grevistas por eles encetados, após anos de ocultamento de sua resistência sob a repressão da ditadura civil-militar (1964-1985. Com a rebeldia operária, as matérias a respeito deste grupo, na Revista,foram se tornando mais constantes e visíveis, pois já não era mais possível, para a Revista Veja, ignorar a existência da classe operária que, com a força insurgente das greves, ocupava as ruas do Brasil.

  1. Relative contributions of Na+/H+ exchange and Na+/HCO3- cotransport to ischemic Na-i(+) overload in isolated rat hearts

    NARCIS (Netherlands)

    Ten Hove, M; Nederhoff, MGJ; Van Echteld, CJA

    2005-01-01

    The Na+/H+ exchanger (NHE) and/or the Na+/HCO3- cotransporter (NBC) were blocked during ischemia in isolated rat hearts. Intracellular Na+ concentration ([Na+](i)), intracellular pH (pH(i)), and energy-related phosphates were measured by using simultaneous Na-23 and P-31 NMR spectroscopy. Hearts wer

  2. SISTEMI IPTV NA IP MULTIMEDIJSKEM PODSISTEMU

    OpenAIRE

    2013-01-01

    Diplomsko delo obravnava arhitekture sistemov IPTV na IP multimedijskem podsistemu ter pripadajoče storitve in funkcije IPTV na IP multimedijskem podsistemu. Predstavljene arhitekture prinašajo veliko novih funkcionalnosti, ki so podrobneje predstavljene po posameznih enotah. V nalogi je tudi podrobneje opisana arhitektura IP multimedijskega podsistema z ravninami in protokoli. Naloga se zaključuje s storitvami na takšnih arhitekturah.

  3. PREZENTACIJA RAZVALIN GRADU NA PIRAMIDI V MARIBORU

    OpenAIRE

    Šegula Seršen, Pina

    2014-01-01

    Diplomsko delo podaja predlog za ohranitev ostalin razvalin gradu na Piramidi v Mariboru. V njem načrtujemo ureditev arheološkega območja Piramida ter problematiko prezentiranja izkopanin v povezavi z umestitvijo novih kulturnih in izobraževalnih funkcij. Diplomsko delo je sestavljeno iz analitičnega in projektnega dela. V prvem delu so raziskani arhitekturni, zgodovinski in kulturnovarstveni aspekti, na podlagi katerih je razvit idejni projekt, opisan v drugem delu naloge.

  4. O consumo na vida digital

    Directory of Open Access Journals (Sweden)

    Iuri Yudi Furukita Baptista

    2016-02-01

    Full Text Available O modelo de consumo não possui as mesmas características sempre: suas relações, motivações, formatos, espaços, interesses e atividades são construções sociais que se modificam atreladas ao cenário econômico, político e tecnológico. O presente trabalho repassa o surgimento da sociedade do consumidor para então conjecturar sobre as propriedades distintivas do consumo na vida digital. O que se defende ao final é que o consumidor já não se restringe ao papel de consumir.

  5. Fabrication of implanted $^{22}$Na targets

    CERN Multimedia

    2002-01-01

    A knowledge of the $^{22}$Na(p,$\\gamma$)$^{23}$ Mg reaction rate is of significant astrophysical interest. In order to complete previous studies of this reaction, radioactive $^{22}$Na targets of high purity are required. We ask for support to fabricate these targets via the implantation technique at ISOLDE GPS (off—line mode) using $^{22}$Na nuclides in an Al matrix produced in Nov. 1990 at the PSI (Zürich). The $^{22}$Na nuclides are released and ionized in a surface ionisation source, mass-analyzed at ISOLDE GPS, and implanted in a Ni-Ta backing and a C—foil in a special implantation setup.

  6. NA-NET numerical analysis net

    Energy Technology Data Exchange (ETDEWEB)

    Dongarra, J. (Tennessee Univ., Knoxville, TN (United States). Dept. of Computer Science Oak Ridge National Lab., TN (United States)); Rosener, B. (Tennessee Univ., Knoxville, TN (United States). Dept. of Computer Science)

    1991-12-01

    This report describes a facility called NA-NET created to allow numerical analysts (na) an easy method of communicating with one another. The main advantage of the NA-NET is uniformity of addressing. All mail is addressed to the Internet host na-net.ornl.gov'' at Oak Ridge National Laboratory. Hence, members of the NA-NET do not need to remember complicated addresses or even where a member is currently located. As long as moving members change their e-mail address in the NA-NET everything works smoothly. The NA-NET system is currently located at Oak Ridge National Laboratory. It is running on the same machine that serves netlib. Netlib is a separate facility that distributes mathematical software via electronic mail. For more information on netlib consult, or send the one-line message send index'' to netlib{at}ornl.gov. The following report describes the current NA-NET system from both a user's perspective and from an implementation perspective. Currently, there are over 2100 members in the NA-NET. An average of 110 mail messages pass through this facility daily.

  7. NA-NET numerical analysis net

    Energy Technology Data Exchange (ETDEWEB)

    Dongarra, J. [Tennessee Univ., Knoxville, TN (United States). Dept. of Computer Science]|[Oak Ridge National Lab., TN (United States); Rosener, B. [Tennessee Univ., Knoxville, TN (United States). Dept. of Computer Science

    1991-12-01

    This report describes a facility called NA-NET created to allow numerical analysts (na) an easy method of communicating with one another. The main advantage of the NA-NET is uniformity of addressing. All mail is addressed to the Internet host ``na-net.ornl.gov`` at Oak Ridge National Laboratory. Hence, members of the NA-NET do not need to remember complicated addresses or even where a member is currently located. As long as moving members change their e-mail address in the NA-NET everything works smoothly. The NA-NET system is currently located at Oak Ridge National Laboratory. It is running on the same machine that serves netlib. Netlib is a separate facility that distributes mathematical software via electronic mail. For more information on netlib consult, or send the one-line message ``send index`` to netlib{at}ornl.gov. The following report describes the current NA-NET system from both a user`s perspective and from an implementation perspective. Currently, there are over 2100 members in the NA-NET. An average of 110 mail messages pass through this facility daily.

  8. IZGRADNJA MIKRO HIDROELEKTRARNE NA SKRBINSKEM POTOKU

    OpenAIRE

    Brezočnik, Simon

    2012-01-01

    Namen diplomske naloge je izgradnja mikro hidroelektrarne na Skrbinskem potoku. Predstavljene so splošne komponente potrebne za proizvajanje električne energije na manjšem vodotoku ˝Skrbinski˝ potok z možnostjo agregata do moči 36 kVA. Tema diplomske naloge je zanimiva, saj je nekoč visokogorska kmetija že imela manjšo postrojenje za samooskrbo domačije z električno energijo v mlinu na potoku Žavc in na potoku Radoljna, kjer je proizvajala električno energijo za potrebe žage torej za razrez ...

  9. A Biotecnologia na esfera pública

    OpenAIRE

    2007-01-01

    Este trabalho foca o envolvimento de cidadãos ligados à agricultura, à I&D agronómica e ao meio rural em assuntos de inovação na agricultura,tomando como caso de estudo ‘a biotecnologia na agricultura’ designada por agrobiotecnologia ou biotecnologia verde, na qual se incluem os organismos geneticamente modificados (‘OGM’) ou transgénicos. O seu uso na agricultura tem gerado desacordo entre os seus adeptos e os seus opositores, incluindo-se nestes dois grupos diversos actores. Pelo facto d...

  10. STRES NA DELOVNEM MESTU X BANKE

    OpenAIRE

    Trtnik, Matjaž

    2010-01-01

    POVZETEK Namen tega diplomskega dela je predstaviti dejstva o prisotnosti stresa na delovnem mestu v X banki, ki sem jih pridobil s pomočjo raziskave v konkretni organizaciji. Cilj dela je zajeti različna poglavja in področja izbrane teme, jih preučiti in oceniti obstoječe stanje v podjetju, ter na podlagi zbranih podatkov podati predloge za izboljšave. Diplomsko delo sestavlja osem poglavij, kot celoto pa bi ga lahko razdelil na tri dele: V prvem, teoretičnem delu, bom za boljše r...

  11. NaHCO3 and NaC1 tolerance in chronic renal failure.

    Science.gov (United States)

    Husted, F C; Nolph, K D; Maher, J F

    1975-08-01

    In patients with chronic renal failure, NaHCO3 therapy may correct or prevent acidemia. It has been proposed that the NaHCO3 required will not result in clinically significant Na retention comparable to that from similar increases in NaC1 intake. In each of ten patients with chronic renal failure, creatinine clearance (Ccr) range 2.5-16.8 ml/min, on an estimated 10-meq Na and C1 diet, electrolyte excretion was compared on NaHCO3 vs NaC1 supplements of 200 meq/day. Periods of NaHCO3 and NaC1 (in alternate order for successive patients) lasted 4 days, separated by reequilibration to base-line weight. Mean +/- SEM excretion (ex) of Na, C1, and HCO3 and deltaCcr and deltaweight (day 4-1) are compared below for the 4th day of NaC1 vs. NaHCO3 intake. Mean Ccr +/-SEM on day 4 of NaC1 and NaHCO3 were 10.8 +/-1.6 and 9.0 +/-1.4 ml/min, respectively (P less than 0.02). Mean systolic blood pressure (but not diastolic) increased significantly on NaC1 (P less than 0.05). No significant blood pressure changes were seen on NaHCO3. Net positive HCO3 balance occurred on NaHCO3 as indicated above and reflected a rise in mean serum HCO3 from 19 to 30 meq/liter (day 1 vs. 4) (P less than 0.01). Mechanisms for the greater excretion of Na on NaHCO3 may relate to C1 wasting as noted above on low C1 intake and limited HCO3 reabsorptive capacity. Thus, Na excretion by day 4 was greater on NaHCO3 than on NaHCO3 did Na excretion near intake (210 meq/day).

  12. Odpowiedź na pytanie

    Directory of Open Access Journals (Sweden)

    Michel Foucault

    2016-12-01

    Full Text Available Prezentowany artykuł Michela Foucaulta został opublikowany w 1963 roku. Foucault rozwija w nim koncepcję archeologii wiedzy – metody analizy historycznych dyskursów, którą zaprezentuje w sześć lat później w książce o tym właśnie tytule. Artykuł powstał na kanwie pytania wybranego przez autora spośród zadanych mu przez redakcję „Esprit”, które dotyczyło możliwości pojęciowego opracowania przymusu systemu dyskursywnego przy jednoczesnym zaakcentowaniu nieciągłości w jego obrębie a tym samym możliwości twórczego działania w historii ducha. A także, czy tak sformułowana aporia zakładałaby z konieczności zgodę na przymus systemu lub afirmację siły zdolnej do przekształcenia go za pomocą zewnętrznej przemocy? Tekst jest wprawką do sformułowania dojrzałej teorii dyskursu, rodzajem autoanalizy, która pozwala Foucaultowi powiązać własną metodę historyczną z „progresywistyczną polityką” myśli i rozwiązać w ten sposób dylemat pełnej determinacji i wolnego sprawstwa obecny w rozważaniach wielu strukturalistów.

  13. Interaction between Na+/K+-pump and Na+/Ca2+-exchanger modulates intercellular communication

    DEFF Research Database (Denmark)

    Matchkov, Vladimir; Gustafsson, Helena; Rahman, Awahan;

    2007-01-01

    of Na(+)/K(+)-pump activity by removal of extracellular potassium ([K(+)](o)) also uncoupled cells, but only after inhibition of K(ATP) channels. Inhibition of the Na(+)/Ca(2+)-exchange activity by SEA0400 or by a reduction of the equilibrium potential (making it more negative) also uncoupled the cells....... Depletion of intracellular Na(+) and clamping of [Ca(2+)](i) at low concentrations prevented the uncoupling. The experiments suggest that the Na(+)/K(+)-pump may affect gap junction conductivity via localized changes in [Ca(2+)](i) through modulation of Na(+)/Ca(2+)-exchanger activity.......Ouabain, a specific inhibitor of the Na(+)/K(+)-pump, has previously been shown to interfere with intercellular communication. Here we test the hypothesis that the communication between vascular smooth muscle cells is regulated through an interaction between the Na(+)/K(+)-pump and the Na(+)/Ca(2...

  14. Relationship between intracellular Na+ concentration and reduced Na+ affinity in Na+,K+-ATPase mutants causing neurological disease

    DEFF Research Database (Denmark)

    Toustrup-Jensen, Mads Schak; Einholm, Anja P.; Schack, Vivien;

    2014-01-01

    The neurological disorders familial hemiplegic migraine type 2 (FHM2), alternating hemiplegia of childhood (AHC), and rapid-onset dystonia parkinsonism (RDP) are caused by mutations of Na+,K+-ATPase α2- and α3-isoforms, expressed in glial and neuronal cells, respectively. Although these disorders...... are distinct, they overlap in phenotypical presentation. Two Na+,K+-ATPase mutations, extending the C-terminus by either 28 residues ("+28" mutation) or an extra tyrosine ("+Y"), are associated with FHM2 and RDP, respectively. We describe here functional consequences of these and other neurological disease......, addressing the question to what extent they cause a change of the intracellular Na+ and K+ concentrations ([Na+]i and [K+]i) in COS cells. C-terminal extension mutants generally showed dramatically reduced Na+ affinity without disturbance of K+ binding, as did other RDP mutants. No phosphorylation from ATP...

  15. Kinetin Reversal of NaCl Effects

    Science.gov (United States)

    Katz, Adriana; Dehan, Klara; Itai, Chanan

    1978-01-01

    Leaf discs of Nicotiana rustica L. were floated on NaCl in the presence of kinetin or abscisic acid. On the 5th day 14CO2 fixation, [3H]leucine incorporation, stomatal conductance, and chlorophyll content were determined. Kinetin either partially or completely reversed the inhibitory effects of NaCl while ABA had no effect. PMID:16660618

  16. Inelastic processes in Na+-Ne, Na+-Ar, Ne+-Na, and Ar+-Na collisions in the energy range 0.5-14 keV

    Science.gov (United States)

    Lomsadze, R. A.; Gochitashvili, M. R.; Kezerashvili, R. Ya.

    2015-12-01

    Absolute cross sections for charge-exchange, ionization, and excitation in Na+-Ne and Na+-Ar collisions were measured in the ion energy range 0.5 -10 keV using a refined version of a capacitor method and collision and optical spectroscopy methods simultaneously in the same experimental setup. Ionization cross sections for Ne+-Na and Ar+-Na collisions are measured at energies of 2 -14 keV using a crossed-beam spectroscopy method. The experimental data and the schematic correlation diagrams are used to analyze and determine the mechanisms for these processes. For the charge-exchange process in Na+-Ar collisions two nonadiabatic regions are revealed and mechanisms responsible for these regions are explained. Structural peculiarity on the excitation function for the resonance lines of argon atoms in Na+-Ar collisions are observed and the possible mechanisms of this phenomenon are explored. The measured ionization cross sections for Na+-Ne and Ne+-Na collisions in conjunction with the Landau-Zener formula are used to determine the coupling matrix element and transition probability in a region of pseudocrossing of the potential curves.

  17. Bullying na Escola: um sofrimento

    Directory of Open Access Journals (Sweden)

    Marlene Silva Sardinha Gurpilhares

    2014-07-01

    Full Text Available O bullying é uma forma de violência presente nas escolas e o termo é utilizado para caracterizar todas as formas de agressões repetitivas psicológicas e físicas, direta ou indiretamente. Esta violência causa sofrimentos, intimidação e medo, sempre numa relação de poder entre pares. Esta pesquisa trata de um estudo do bullying escolar: o que é, como surgiu, como identificá-lo e sua caracterização, conseqüências, causas, o papel da escola, de professores e pais e uma proposta prática que pode ser adotada para sua prevenção e contenção. O objetivo é organizar materiais para leitura dos atores educacionais para uma possível reflexão, através de pesquisas bibliográficas. Esta violência é grave e deveria ser tratada como saúde pública, devido às conseqüências que traz, como queda na aprendizagem, na autoestima e em casos mais graves, até o suicido e outras tragédias. A escola necessita atentar para esse tipo de violência, revendo suas ações em todos os momentos, tendo um olhar integral e diferenciado em relação aos alunos. É fundamental que o bullying não seja tratado como brincadeira de criança e para ser identificado e combatido é necessária uma ação entre a família e todos da escola, que pode ser desenvolvida através de projetos que ajudem a apontar caminhos para a solução do problema. Tais ações devem ser pautadas por constantes debates e reflexões, nas quais o aluno se torne o protagonista. Não existem fórmulas prontas, pois a intervenção deve ser feita através da realidade de cada escola.

  18. Razvitak naselja na kvarnerskim otocima - primjer Dobrinja

    Directory of Open Access Journals (Sweden)

    Marijan Bradanović

    2012-12-01

    Full Text Available Na dosad slabo poznatom i sa stajališta povijesti umjetnosti još posve neobrađenom primjeru Dobrinja na otoku Krku, raspravlja se o razvitku naselja na kvarnerskim otocima. Uz isticanje štetnosti dosad prevladavajućih uopćavanja, karakteristični položaj i razvitak Dobrinja tumače se u širem, komparativnom kontekstu. Analiziraju se prostiranje i obilježja pojedinih dijelova ovog naselja, a naglasak je na vremenu kasnog srednjeg i ranijeg novog vijeka. Tada je najuži dio povijesnog središta Dobrinja poprimio čvrstu, na tlorisnoj osnovi i danas, usprkos opsežnim pregradnjama i arhitektonskim preinakama, jasno uočljivu, urbanu fizionomiju.

  19. Negative electrodes for Na-ion batteries.

    Science.gov (United States)

    Dahbi, Mouad; Yabuuchi, Naoaki; Kubota, Kei; Tokiwa, Kazuyasu; Komaba, Shinichi

    2014-08-07

    Research interest in Na-ion batteries has increased rapidly because of the environmental friendliness of sodium compared to lithium. Throughout this Perspective paper, we report and review recent scientific advances in the field of negative electrode materials used for Na-ion batteries. This paper sheds light on negative electrode materials for Na-ion batteries: carbonaceous materials, oxides/phosphates (as sodium insertion materials), sodium alloy/compounds and so on. These electrode materials have different reaction mechanisms for electrochemical sodiation/desodiation processes. Moreover, not only sodiation-active materials but also binders, current collectors, electrolytes and electrode/electrolyte interphase and its stabilization are essential for long cycle life Na-ion batteries. This paper also addresses the prospect of Na-ion batteries as low-cost and long-life batteries with relatively high-energy density as their potential competitive edge over the commercialized Li-ion batteries.

  20. Anodic Synthesis and Characterization of Na-Pb-O, Na-Pb-Bi-O Crystals

    Institute of Scientific and Technical Information of China (English)

    Li Mei QIU; Fen LIU; Liang Zhong ZHAO

    2005-01-01

    Crystals of Na-Pb-O and Na-Pb-Bi-O were electrosynthesized on the anode from molten salts. The resulting crystals have a hexagonal structure, in which the base ions (Pb and Bi) are in high oxidation states. By using KOH/NaOH (atomic ratio K:Na=1:1) mixture as a flux,incorporation of K ions into the lattice is inhibited while incorporation of Bi ions is enhanced. The magnetic measurement shows that the Na-Pb-Bi-O crystals are dominated by diamagnetism.

  1. Barroco: A tempestade na Biblioteca

    Directory of Open Access Journals (Sweden)

    Diego Cervelin

    2008-12-01

    Full Text Available Desde que Heinrich Wölfflin, nos últimos vinte anos do século XIX, se interessou por trazer à tona as formas arquitetônicas do século XVII conferindo-lhes caráter autônomo de estilo histórico determinável, não é nenhuma novidade que os estudos sobre o barroco pudessem polarizar – quase sempre em um tom colérico – os pesquisadores da arte e da cultura. Em terras do Brasil, não chega a ser de todo descabido recordar a severíssima crítica operada por Sérgio Buarque de Holanda em Raízes do Brasil. O livro, que pretende detectar a avalanche de equívocos que teria povoado o passado nacional com as vistas voltadas para a concretização de um projeto de emancipação e progresso na linha da história brasileira, apresenta em seu quarto capítulo uma impugnação explícita ao passado colonial.

  2. Barroco: A tempestade na Biblioteca

    Directory of Open Access Journals (Sweden)

    Diego Cervelin

    2008-10-01

    Full Text Available http://dx.doi.org/10.5007/1984-784x.2008v8n12p167 Desde que Heinrich Wölfflin, nos últimos vinte anos do século XIX, se interessou por trazer à tona as formas arquitetônicas do século XVII conferindo-lhes caráter autônomo de estilo histórico determinável, não é nenhuma novidade que os estudos sobre o barroco pudessem polarizar – quase sempre em um tom colérico – os pesquisadores da arte e da cultura. Em terras do Brasil, não chega a ser de todo descabido recordar a severíssima crítica operada por Sérgio Buarque de Holanda em Raízes do Brasil. O livro, que pretende detectar a avalanche de equívocos que teria povoado o passado nacional com as vistas voltadas para a concretização de um projeto de emancipação e progresso na linha da história brasileira, apresenta em seu quarto capítulo uma impugnação explícita ao passado colonial.

  3. Terapia de linguagem na afasia

    Directory of Open Access Journals (Sweden)

    Mauro Spinelli

    1977-12-01

    Full Text Available A terapia da linguagem na afasia foi estudada em 15 pacientes, 8 do sexo masculino e 7 do sexo feminino; a idade variou de menos de 10 anos a mais de 50 anos; em 11 casos a afasia era sequela de acidente vascular cerebral e, em 4, de traumatismo crânio-encefálico. Quanto ao tipo de afasia, 5 pacientes apresentavam déficits predominantemente de expressão e 10 apresentavam déficits receptivos e expressivos em graus equiparáveis. Em 6 casos a terapia foi iniciada dentro dos 3 primeiros meses de instalação do quadro; nos restantes foi iniciada mais tardiamente. Dos 15 pacientes, 11 apresentaram evolução satisfatória, a qual não depndeu do grau de afasia, do tipo de afasia, da idade do paciente, do tipo de patologia e do intervalo entre a instalação do quadro afásico e o início da terapia. A terapia da linguagem no paciente afásico é efetiva, o prognóstico não pode ser feito a priori. Somente a evolução do caso com sua retestagem criteriosa poderá dar dados realmente úteis para se falar em evolução.

  4. 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.

  5. Gasotransmitters: novel regulators of epithelial na(+) transport?

    Science.gov (United States)

    Althaus, Mike

    2012-01-01

    The vectorial transport of Na(+) across epithelia is crucial for the maintenance of Na(+) and water homeostasis in organs such as the kidneys, lung, or intestine. Dysregulated Na(+) transport processes are associated with various human diseases such as hypertension, the salt-wasting syndrome pseudohypoaldosteronism type 1, pulmonary edema, cystic fibrosis, or intestinal disorders, which indicate that a precise regulation of epithelial Na(+) transport is essential. Novel regulatory signaling molecules are gasotransmitters. There are currently three known gasotransmitters: nitric oxide (NO), carbon monoxide (CO), and hydrogen sulfide (H(2)S). These molecules are endogenously produced in mammalian cells by specific enzymes and have been shown to regulate various physiological processes. There is a growing body of evidence which indicates that gasotransmitters may also regulate Na(+) transport across epithelia. This review will summarize the available data concerning NO, CO, and H(2)S dependent regulation of epithelial Na(+) transport processes and will discuss whether or not these mediators can be considered as true physiological regulators of epithelial Na(+) transport biology.

  6. Gasotransmitters: Novel regulators of epithelial Na+ transport?

    Directory of Open Access Journals (Sweden)

    Mike eAlthaus

    2012-04-01

    Full Text Available The vectorial transport of Na+ across epithelia is crucial for the maintenance of Na+ and water homeostasis in organs such as the kidneys, lung or intestine. Dysregulated Na+ transport processes are associated with various human diseases such as hypertension, the salt-wasting syndrome pseudohypoaldosteronism type 1, pulmonary edema, cystic fibrosis or intestinal disorders, which indicate that a precise regulation of epithelial Na+ transport is essential. Novel regulatory signaling molecules are gasotransmitters. There are currently three known gasotransmitters: nitric oxide (NO, carbon monoxide (CO and hydrogen sulfide (H2S. These molecules are endogenously produced in mammalian cells by specific enzymes and have been shown to regulate various physiological processes. There is a growing body of evidence, which indicates that gasotransmitters may also regulate Na+ transport across epithelia. This review will summarize the available data concerning NO, CO and H2S dependent regulation of epithelial Na+ transport processes and will discuss whether or not these mediators can be considered as true physiological regulators of epithelial Na+ transport biology.

  7. NMR studies on Na+ transport in Synechococcus PCC 6311

    Science.gov (United States)

    Nitschmann, W. H.; Packer, L.

    1992-01-01

    The freshwater cyanobacterium Synechococcus PCC 6311 is able to adapt to grow after sudden exposure to salt (NaCl) stress. We have investigated the mechanism of Na+ transport in these cells during adaptation to high salinity. Na+ influx under dark aerobic conditions occurred independently of delta pH or delta psi across the cytoplasmic membrane, ATPase activity, and respiratory electron transport. These findings are consistent with the existence of Na+/monovalent anion cotransport or simultaneous Na+/H+ +anion/OH- exchange. Na+ influx was dependent on Cl-, Br-, NO3-, or NO2-. No Na+ uptake occurred after addition of NaI, NaHCO3, or Na2SO4. Na+ extrusion was absolutely dependent on delta pH and on an ATPase activity and/or on respiratory electron transport. This indicates that Na+ extrusion via Na+/H+ exchange is driven by primary H+ pumps in the cytoplasmic membrane. Cells grown for 4 days in 0.5 m NaCl medium, "salt-grown cells," differ from control cells by a lower maximum velocity of Na+ influx and by lower steady-state ratios of [Na+]in/[Na+]out. These results indicate that cells grown in high-salt medium increase their capacity to extrude Na+. During salt adaptation Na+ extrusion driven by respiratory electron transport increased from about 15 to 50%.

  8. PLESNO USTVARJANJE NA PODLAGI LITERARNEGA BESEDILA

    OpenAIRE

    Krajnc, Jožica; Zaponšek, Mojca

    2009-01-01

    Diplomsko delo z naslovom Plesno ustvarjanje na podlagi literarnega besedila je zapisano v okviru plesnega ustvarjanja otrok ob slikanici Bravo, putka!. V teoretičnem delu je obravnavan ples v povezavi z njegovim izražanjem in vzgojo. Ob tem je posebej izpostavljena estetika v plesu, sodobni ples ter balet. Poudarek je tudi na improviziranju in oblikovanju ter na dihanju in ritmu. Ob tem sta izpostavljena glasba in književnost kot pomembna motivacijska dejavnika. Teoretični del je nadgrajen s...

  9. Nalaz tombusvirusa na vrsti Erigeron canadensis L.

    OpenAIRE

    Jeknić, Zoran; Erić, Živojin; Grbelja, Julijana

    1988-01-01

    Iz listova zaraženih primjeraka korovne biljke Erigeron canadensis L. koji su rasli na nekoliko lokaliteta u Sarajevu izoliran je virus iz skupine tombusvirusi. Identifikacija virusa izvršena je na osnovi reakcije pokusnih biljaka, analize ultratankih presjeka kroz zaraženo tkivo, morfologije i veličine virusnih čestica, te na osnovi seroloških reakcija metodom dvostruke imunodifuzije u agarskom gelu i čvrsto fazne imunoelektronske mikroskopije (SPIEM). U serološkim pokusima upotrijebljen je ...

  10. Kornati na starim geografskim i pomorskim kartama

    OpenAIRE

    Faričić, Josip; Simičić, Zdenko

    2005-01-01

    U radu se na temelju analize kartografskih izvora analizira historijsko-geografski razvitak Kornatskih otoka, koji čine najbrojniju skupinu među hrvatskim otocima. Stare se karte koriste ponajprije kao sredstvo geografskih istraživanja, koje u nužnoj korelaciji s istovremenim povijesnim pisanim izvorima te modernim topografskim i pomorskim kartama čine osnovu za oblikovanje istraživačke platforme na kojoj se mogu graditi relevantni znanstveni rezultati. Na temelju starih karata moguće je, uz ...

  11. EKSPERIMENTALNA ANALIZA VIBRACIJ NA PRALNI GRUPI

    OpenAIRE

    Kozel, Rok

    2012-01-01

    Diplomsko delo se ukvarja z vibracijami pralnega stroja. Eksperimentalno analizo smo opravili na laboratorijskem preizkuševališču, kjer je pralna grupa obešena na namenskem ogrodju. Na pralni grupi sta nameščena pospeškomera ADXL345, ki sta s serijsko SPI komunikacijo povezana z NI PXI-7841R karto. NI PXI-7841R karta je v ohišju NI PXI 1003 in je povezana z računalnikom. Pralna grupa je opremljena tudi z BLAC motorjem, s katerim operira razvojna plošča NEXYS 2. Vse skupaj nadziramo preko raču...

  12. PERUBAHAN KEKERASAN DENTIN PADA SALURAN AKAR SETELAH APLIKASI NaOCl 3%, KOMBINASI NaOCl 3% - EDTA 17%, DAN NaOCl 3% - KLORHEKSIDIN 2%

    OpenAIRE

    ALFINA, RISCA

    2014-01-01

    2014 PERUBAHAN KEKERASAN DENTIN PADA SALURAN AKAR SETELAH APLIKASI NaOCl 3%, KOMBINASI NaOCl 3% - EDTA 17%, DAN NaOCl 3% - KLORHEKSIDIN 2% Risca Alfina Fakultas Kedokteran Gigi Universitas Hasanuddin ABSTRAK Latar Belakang: Beberapa larutan irigasi yang biasa digunakan saat pembersihan dan preparasi saluran akar yaitu sodium hypochlorite (NaOCl), klorheksidin, dan ethylenediaminetetraacetic acid (EDTA). Larutan irigasi tersebut berinteraks...

  13. Chemical thermodynamics of metallic alloy formation. Final report. [Na-K; Mg-Cd; NaCl-NaBr

    Energy Technology Data Exchange (ETDEWEB)

    Wallace, W.E.

    1951-12-01

    Methods and apparatus required in determining the heats of formation at 25/sup 0/C of sodium-potassium alloys, magnesium-cadmium alloys and sodium chloride-sodium bromide ionic solid solutions have been developed. Method for determining free energies of formation of magnesium-cadmium alloys at elevated temperatures has been developed. Apparatus for determining the specific heats of magnesium-cadmium alloys at low temperatures has been prepared. The heat of reaction of pure potassium with water was determined. Provisional values for the heats of formation of four sodium-potassium alloys were obtained. A density-composition curve for magnesium-cadmium alloys was constructed. Heats of formation of nine NaCl-NaBr solid solutions were measured and the data used to calculate thermodynamically the phase diagram describing the mutual solid solubility of the two salts. Lattice spacings of NaCl-NaBr solid solutions were determined by x-ray diffraction techniques and the results compared with Vegnard's Rule and the additivity rule for molar volumes. A theoretical study based upon the Born-Mayer model for ionic solids was made to attempt to account for the variation with composition of the energy and lattice spacings of the alkali halide solid solutions. Comparison of results for the NaCl-NaBr system with those obtained in a similar study of Fontell indicated some discrepancies which were removed by a retreatment of Fontell's data.

  14. Perfil nutricional na artrite reumatoide

    Directory of Open Access Journals (Sweden)

    Rachel Simone Maccarini Zarpellon

    2014-01-01

    Full Text Available Objetivo: Estudar o perfil nutricional de pacientes com artrite reumatoide (AR. Métodos: Estudo transversal observacional de 102 pacientes com AR. Os pacientes foram estudados para dados clínicos, demográficos, sorológicos, atividade de doença e perfil nutricional. Neste último incluiu-se a medida do índice de massa corporal (IMC, relação quadril/cintura, pregas cutâneas bicipitais (PCB e sua adequação; prega cutânea tricipital (PCT e sua adequação e circunferência muscular do braço (CMB e sua adequação. Estudos de associação foram feitos usando os testes de Fisher e qui-quadrado para dados nominais e teste t não pareado e Mann Whitney para dados numéricos. Para cálculo de correlação usou-se o teste de Spearman. Resultado: Na amostra existiam 14/102 homens e 88/102 mulheres com idade média de 52,1 ± 11,5 anos e duração média de doença de 10,6 ± 7,4 anos. A relação cintura/quadril média era de 0,92 ± 0,07. De acordo com IMC, 30,3% tinham peso normal e 65,5% tinham peso acima do normal. De acordo com PCB, 74,5% eram normais e 25,5% tinham depleção; de acordo com a PCT, 83,3% eram normais e 16,7% tinham depleção. Associação de variáveis nutricionais com gênero, fator reumatoide, nódulos e atividade da doença não mostraram diferenças (p = NS exceto, por uma relação cintura/quadril menor em indivíduos com nódulos (p = 0,02 e uma correlação modesta da PCT com a duração de doença (p = 0,02; R = 0,22; 95% IC = 0,01-0,40. Conclusão: Existe uma alta prevalência de sobrepeso e obesidade em artrite reumatoide e uma pequena frequência de depleção muscular.

  15. NaCl (mM)

    African Journals Online (AJOL)

    Yomi

    2012-04-03

    Apr 3, 2012 ... MDA was determined for aerial parts following a published procedure .... MDA, a generic biomarker for membrane damage. (Elkahoui et al. ..... acid and essential oil composition of sage (Salvia officinalis L,) leaves under NaCl ...

  16. Aerobe zuivering van vergiste varkensdrijfmest na aanzuren

    NARCIS (Netherlands)

    Goossens, W.

    1988-01-01

    Onderzoeksverslag betreffende een vorm van nazuivering, bedoeld om de vluchtige componenten (vetzuren), die na vergisting nog aanwezig zijn, te oxideren. De mest wordt belucht onder toevoeging van zwavelzuur. Het zure milieu voorkomt ammoniakemissie tijdens het beluchten. Bovendien zullen in volgend

  17. Erythrocyte 22Na+ influx in hypertension

    Energy Technology Data Exchange (ETDEWEB)

    Shalev, O.; Eaton, J.W.; Ben-Ishay, D.

    1984-01-01

    We assessed 22Na+ uptake by erythrocytes (RBC) from 38 individuals with essential hypertension and 37 healthy controls. All subjects were male, white, non-obese and with normal renal function, obviating sex, race, hormonal, ponderal and renal factors known to influence RBC Na+ handling. The mean +/- sem 22Na+ uptake of the patients was 284 +/- 16 mumole/liter RBC/hour while that of normal controls was 249 +/- 11 mumole/liter RBC/hour; although the difference reached borderline significance, individual values showed considerable overlap. Consequently, in our population, RBC 22Na+ uptake is not a reliable marker for essential hypertension. We believe that previous studies should be reassessed with regard to patients' characteristics and future studies employ rigorous criteria in selection of subjects.

  18. Waardevolle lessen na overstromingen in Thailand

    NARCIS (Netherlands)

    Jonkman, S.N.; Van der Meer, M.T.; Hardeman, B.

    2012-01-01

    Een verkenningsmissie na de overstromingen in Thailand in 2011 heeft meer inzicht gegeven in het functioneren van het waterkeringssysteem tijdens de ramp. Dijken bleken kwetsbaar door overloop, evenals de aansluitingen tussen dijken en constructies.

  19. Painful Na-channelopathies: an expanding universe.

    Science.gov (United States)

    Waxman, Stephen G

    2013-07-01

    The universe of painful Na-channelopathies--human disorders caused by mutations in voltage-gated sodium channels--has recently expanded in three dimensions. We now know that mutations of sodium channels cause not only rare genetic 'model disorders' such as inherited erythromelalgia and channelopathy-associated insensitivity to pain but also common painful neuropathies. We have learned that mutations of NaV1.8, as well as mutations of NaV1.7, can cause painful Na-channelopathies. Moreover, recent studies combining atomic level structural models and pharmacogenomics suggest that the goal of genomically guided pain therapy may not be unrealistic. Copyright © 2013 Elsevier Ltd. All rights reserved.

  20. Hydrogen-fluorine exchange in NaBH4-NaBF4.

    Science.gov (United States)

    Rude, L H; Filsø, U; D'Anna, V; Spyratou, A; Richter, B; Hino, S; Zavorotynska, O; Baricco, M; Sørby, M H; Hauback, B C; Hagemann, H; Besenbacher, F; Skibsted, J; Jensen, T R

    2013-11-07

    Hydrogen-fluorine exchange in the NaBH4-NaBF4 system is investigated using a range of experimental methods combined with DFT calculations and a possible mechanism for the reactions is proposed. Fluorine substitution is observed using in situ synchrotron radiation powder X-ray diffraction (SR-PXD) as a new Rock salt type compound with idealized composition NaBF2H2 in the temperature range T = 200 to 215 °C. Combined use of solid-state (19)F MAS NMR, FT-IR and DFT calculations supports the formation of a BF2H2(-) complex ion, reproducing the observation of a (19)F chemical shift at -144.2 ppm, which is different from that of NaBF4 at -159.2 ppm, along with the new absorption bands observed in the IR spectra. After further heating, the fluorine substituted compound becomes X-ray amorphous and decomposes to NaF at ~310 °C. This work shows that fluorine-substituted borohydrides tend to decompose to more stable compounds, e.g. NaF and BF3 or amorphous products such as closo-boranes, e.g. Na2B12H12. The NaBH4-NaBF4 composite decomposes at lower temperatures (300 °C) compared to NaBH4 (476 °C), as observed by thermogravimetric analysis. NaBH4-NaBF4 (1:0.5) preserves 30% of the hydrogen storage capacity after three hydrogen release and uptake cycles compared to 8% for NaBH4 as measured using Sievert's method under identical conditions, but more than 50% using prolonged hydrogen absorption time. The reversible hydrogen storage capacity tends to decrease possibly due to the formation of NaF and Na2B12H12. On the other hand, the additive sodium fluoride appears to facilitate hydrogen uptake, prevent foaming, phase segregation and loss of material from the sample container for samples of NaBH4-NaF.

  1. Positron-impact ionization of Na

    Energy Technology Data Exchange (ETDEWEB)

    Mukherjee, K.K. (Jawahar Navodaya Vidyalaya, Ramchandraghat, West Tripura 799207, Tripura (India)); Singh, N.R. (Thambal Marik College, Oinam, Bishanpur, Manipur (India)); Choudhury, K.B. (Department of Physics, Jadavpur University, Calcutta 700032, West Bengal (India)); Mazumdar, P.S. (Department of Physics, Manipur University, Canchipur, Imphal 795003, Manipur (India))

    1992-07-01

    In this paper we present the total cross sections for the positron-impact ionization of Na in the range 8--30 eV of the energy of the incident positron. Calculations are done by using a distorted-wave approximation incorporating the effects of screening and distortion. The present results are compared with the experimental results for the electron-impact ionization of Na.

  2. IZDELAVA IN VODENJE AVTONOMNEGA VOZILA NA GOSENICAH

    OpenAIRE

    Obal, Aleš

    2012-01-01

    V Diplomskem delu je opisan postopek izdelave kontrolno nadzornega sistema za vodenje robota po prostoru. Ključni deli tega sistema so senzorji za merjenje orientacije in pozicije vozila na mikrokrmilniškem sistemu. Vozilu smo dodali komunikacijo z osebnim računalnikom za oddaljen nadzor in na koncu povzeli še program, ki smo ga napisali v mikroC programskem okolju.

  3. Elastic Coulomb breakup of $^{34}$Na

    CERN Document Server

    Singh, G; Chatterjee, R

    2016-01-01

    Purpose : The aim of this paper is to study the elastic Coulomb breakup of $^{34}$Na on $^{208}$Pb to give us a core of $^{33}$Na with a neutron and in the process we try and investigate the one neutron separation energy and the ground state configuration of $^{34}$Na. Method : A fully quantum mechanical Coulomb breakup theory within the architecture of post-form finite range distorted wave Born approximation extended to include the effects of deformation is used to research the elastic Coulomb breakup of $^{34}$Na on $^{208}$Pb at 100 MeV/u. The triple differential cross-section calculated for the breakup is integrated over the desired components to find the total cross-section, momentum and angular distributions as well as the average momenta, along with the energy-angular distributions. Results : The total one neutron removal cross-section is calculated to test the possible ground state configurations of $^{34}$Na. The average momentum results along with energy-angular calculations indicate $^{34}$Na to ha...

  4. Efeitos imediatos da MWM na dor, amplitude de movimento e funcionalidade, na osteoartrite da anca.

    OpenAIRE

    Beselga, Carlos

    2014-01-01

    Introdução: A mobilização com movimento (MWM), segundo o Conceito Mulligan tem apresentado bons resultados na melhoria da dor, amplitude de movimento e funcionalidade em diversas disfunções. No entanto, existem poucos estudos sobre a articulação da anca e, até este momento, não foi avaliada a sua efetividade em indivíduos com osteoartrite da anca. Objectivo(s): Avaliar os efeitos imediatos da técnica de MWM na dor, na amplitude de movimento e na função física em indivíduos com ...

  5. Glutamate Water Gates in the Ion Binding Pocket of Na+ Bound Na+, K+-ATPase

    Science.gov (United States)

    Han, Minwoo; Kopec, Wojciech; Solov’yov, Ilia A.; Khandelia, Himanshu

    2017-01-01

    The dynamically changing protonation states of the six acidic amino acid residues in the ion binding pocket of the Na+, K+ -ATPase (NKA) during the ion transport cycle are proposed to drive ion binding, release and possibly determine Na+ or K+ selectivity. We use molecular dynamics (MD) and density functional theory (DFT) simulations to determine the protonation scheme of the Na+ bound conformation of NKA. MD simulations of all possible protonation schemes show that the bound Na+ ions are most stably bound when three or four protons reside in the binding sites, and that Glu954 in site III is always protonated. Glutamic acid residues in the three binding sites act as water gates, and their deprotonation triggers water entry to the binding sites. From DFT calculations of Na+ binding energies, we conclude that three protons in the binding site are needed to effectively bind Na+ from water and four are needed to release them in the next step. Protonation of Asp926 in site III will induce Na+ release, and Glu327, Glu954 and Glu779 are all likely to be protonated in the Na+ bound occluded conformation. Our data provides key insights into the role of protons in the Na+ binding and release mechanism of NKA. PMID:28084301

  6. Sementes geneticamente modificadas: seguranca e racionalidade na adocao de transgenicos no Brasil e na Argentina

    National Research Council Canada - National Science Library

    Fuck, Marcos Paulo; Bonacelli, Maria Beatriz

    2009-01-01

    Esse artigo analisa as principais questoes relacionadas ao processo de introducao de sementes geneticamente modificadas no Brasil e na Argentina, com especial atencao as variedades de soja transgenica...

  7. Elastic Coulomb breakup of 34Na

    Science.gov (United States)

    Singh, G.; Shubhchintak, Chatterjee, R.

    2016-08-01

    Background: 34Na is conjectured to play an important role in the production of seed nuclei in the alternate r -process paths involving light neutron rich nuclei very near the β -stability line, and as such, it is important to know its ground state properties and structure to calculate rates of the reactions it might be involved in, in the stellar plasma. Found in the region of `island of inversion', its ground state might not be in agreement with normal shell model predictions. Purpose: The aim of this paper is to study the elastic Coulomb breakup of 34Na on 208Pb to give us a core of 33Na with a neutron and in the process we try and investigate the one neutron separation energy and the ground state configuration of 34Na. Method: A fully quantum mechanical Coulomb breakup theory within the architecture of post-form finite range distorted wave Born approximation extended to include the effects of deformation is used to research the elastic Coulomb breakup of 34Na on 208Pb at 100 MeV/u. The triple differential cross section calculated for the breakup is integrated over the desired components to find the total cross-section, momentum, and angular distributions as well as the average momenta, along with the energy-angular distributions. Results: The total one neutron removal cross section is calculated to test the possible ground state configurations of 34Na. The average momentum results along with energy-angular calculations indicate 34Na to have a halo structure. The parallel momentum distributions with narrow full widths at half-maxima signify the same. Conclusion: We have attempted to analyze the possible ground state configurations of 34Na and in congruity with the patterns in the `island of inversion' conclude that even without deformation, 34Na should be a neutron halo with a predominant contribution to its ground state most probably coming from 33Na(3 /2+)⊗ 2 p3 /2ν configuration. We also surmise that it would certainly be useful and rewarding to test our

  8. Quasi-solid state rechargeable Na-CO2 batteries with reduced graphene oxide Na anodes.

    Science.gov (United States)

    Hu, Xiaofei; Li, Zifan; Zhao, Yaran; Sun, Jianchao; Zhao, Qing; Wang, Jianbin; Tao, Zhanliang; Chen, Jun

    2017-02-01

    Na-CO2 batteries using earth-abundant Na and greenhouse gas CO2 are promising tools for mobile and stationary energy storage, but they still pose safety risks from leakage of liquid electrolyte and instability of the Na metal anode. These issues result in extremely harsh operating conditions of Na-CO2 batteries and increase the difficulty of scaling up this technology. We report the development of quasi-solid state Na-CO2 batteries with high safety using composite polymer electrolyte (CPE) and reduced graphene oxide (rGO) Na anodes. The CPE of PVDF-HFP [poly(vinylidene fluoride-co-hexafluoropropylene)]-4% SiO2/NaClO4-TEGDME (tetraethylene glycol dimethyl ether) has high ion conductivity (1.0 mS cm(-1)), robust toughness, a nonflammable matrix, and strong electrolyte-locking ability. In addition, the rGO-Na anode presents fast and nondendritic Na(+) plating/stripping (5.7 to 16.5 mA cm(-2)). The improved kinetics and safety enable the constructed rGO-Na/CPE/CO2 batteries to successfully cycle in wide CO2 partial pressure window (5 to 100%, simulated car exhaust) and especially to run for 400 cycles at 500 mA g(-1) with a fixed capacity of 1000 mA·hour g(-1) in pure CO2. Furthermore, we scaled up the reversible capacity to 1.1 A·hour in pouch-type batteries (20 × 20 cm, 10 g, 232 Wh kg(-1)). This study makes quasi-solid state Na-CO2 batteries an attractive prospect.

  9. Quasi–solid state rechargeable Na-CO2 batteries with reduced graphene oxide Na anodes

    Science.gov (United States)

    Hu, Xiaofei; Li, Zifan; Zhao, Yaran; Sun, Jianchao; Zhao, Qing; Wang, Jianbin; Tao, Zhanliang; Chen, Jun

    2017-01-01

    Na-CO2 batteries using earth-abundant Na and greenhouse gas CO2 are promising tools for mobile and stationary energy storage, but they still pose safety risks from leakage of liquid electrolyte and instability of the Na metal anode. These issues result in extremely harsh operating conditions of Na-CO2 batteries and increase the difficulty of scaling up this technology. We report the development of quasi–solid state Na-CO2 batteries with high safety using composite polymer electrolyte (CPE) and reduced graphene oxide (rGO) Na anodes. The CPE of PVDF-HFP [poly(vinylidene fluoride-co-hexafluoropropylene)]–4% SiO2/NaClO4–TEGDME (tetraethylene glycol dimethyl ether) has high ion conductivity (1.0 mS cm−1), robust toughness, a nonflammable matrix, and strong electrolyte-locking ability. In addition, the rGO-Na anode presents fast and nondendritic Na+ plating/stripping (5.7 to 16.5 mA cm−2). The improved kinetics and safety enable the constructed rGO-Na/CPE/CO2 batteries to successfully cycle in wide CO2 partial pressure window (5 to 100%, simulated car exhaust) and especially to run for 400 cycles at 500 mA g−1 with a fixed capacity of 1000 mA·hour g−1 in pure CO2. Furthermore, we scaled up the reversible capacity to 1.1 A·hour in pouch-type batteries (20 × 20 cm, 10 g, 232 Wh kg−1). This study makes quasi–solid state Na-CO2 batteries an attractive prospect. PMID:28164158

  10. O Passeio Público do Rio de Janeiro na Literatura, na Pintura e na Fotografia do Século XIX

    Directory of Open Access Journals (Sweden)

    Solange de Aragão

    2012-06-01

    Full Text Available Este artigo tem como objetivo geral e mais amplo chamar a atenção dos pesquisadores para a importância da literatura, da pintura e da fotografia como fontes documentais para a construção da História do Paisagismo no Brasil por meio de um estudo de caso muito particular: o Passeio Público do Rio de Janeiro no século XIX. São objetivos específicos apresentar e analisar o modo como esse espaço livre público aparece na literatura, na pintura e na fotografia desse período, considerando suas transformações paisagísticas.

  11. Voltage dependence of Na translocation by the Na/K pump.

    Science.gov (United States)

    Nakao, M; Gadsby, D C

    During each complete reaction cycle, the Na/K pump transports three Na ions out across the cell membrane and two K ions in. The resulting net extrusion of positive charge generates outward membrane current but, until now, it was unclear how that net charge movement occurs. Reasonable possibilities included a single positive charge moving outwards during Na translocation; or a single negative charge moving inwards during K translocation; or either positive or negative charges moving during both translocation steps, but in unequal quantities. Any step that involves net charge movement through the membrane must have voltage-dependent transition rates. Here we report measurements of transient, voltage-dependent, displacement currents generated by the pump when its normal Na/K transport cycle has been interrupted by removal of external K and it is thus constrained to carry out Na/Na exchange. The quantity and voltage sensitivity of the charge moved during these transient currents suggests that Na translocation includes a voltage-dependent transition involving movement of one positive charge across the membrane. This single step can thus fully account for the electrogenic nature of Na/K exchange. The result provides important new insight into the molecular mechanism of active cation transport.

  12. Efeitos da cafeína na performance de exercícios de endurance

    Directory of Open Access Journals (Sweden)

    Giuliano Roberto da Silva

    2015-10-01

    Full Text Available Objetivo: verificar os efeitos da cafeína na performance de exercícios de endurance, através do teste de exaustão na bicicleta ergométrica. Método: participaram 50 indivíduos do sexo masculino, submetidos ao teste de exaustão em cicloergômetro após ingestão de 6mg/kg de cafeína (CAF (n=25; grupo cafeína, e 6mg/kg de placebo (PLA (n=25; grupo placebo, 40 minutos antes do teste. Os dados foram tratados estatisticamente, submetidos ao teste t de Student (p

  13. Metallic Na formation in NaCl crystals with irradiation of electron or vacuum ultraviolet photon

    Energy Technology Data Exchange (ETDEWEB)

    Owaki, Shigehiro [Osaka Prefecture Univ., Sakai, Osaka (Japan). Coll. of Integrated Arts and Sciences; Koyama, Shigeko; Takahashi, Masao; Kamada, Masao; Suzuki, Ryouichi

    1997-03-01

    Metallic Na was formed in NaCl single crystals with irradiation of a variety of radiation sources and analyzed the physical states with several methods. In the case of irradiation of 21 MeV electron pulses to the crystal blocks, the optical absorption and lifetime measurement of positron annihilation indicated appearance of Na clusters inside. Radiation effects of electron beam of 30 keV to the crystals in vacuum showed the appearance of not only metallic Na but atomic one during irradiation with Auger electron spectroscopy. Intense photon fluxes in vacuum ultraviolet region of synchrotron radiation were used as another source and an analyzing method of ultraviolet photoelectron spectroscopy. The results showed the metallic Na layered so thick that bulk plasmon can exist. (author)

  14. Summer sudden Na number density enhancements measured with the ALOMAR Weber Na Lidar

    Directory of Open Access Journals (Sweden)

    D. Heinrich

    2008-05-01

    Full Text Available We present summer Na-densities and atmospheric temperatures measured 80 to 110 km above the Arctic Lidar Observatory for Middle Atmosphere Research (ALOMAR. The Weber Na Lidar is part of ALOMAR, located at 69° N in Norway, 150 km north of the Arctic Circle. The sun does not set here during the summer months, and measurements require a narrowband Faraday Anomalous Dispersion Optical Filter (FADOF.

    We discuss an observed sudden enhancement in the Na number density around 22:00 UT on 1 to 2 June 2006. We compare this observation with previous summer measurements and find a frequent appearance of Na number density enhancements near local midnight. We describe the time of appearance, the altitude distribution, the duration and the strength of these enhancements and compare them to winter observations. We investigate possible formation mechanisms and, as others before, we find a strong link between these Na number density enhancements and sporadic E layers.

  15. Functional coupling of renal K+ and Na+ handling causes high blood pressure in Na+ replete mice.

    Science.gov (United States)

    Vitzthum, Helga; Seniuk, Anika; Schulte, Laura Helene; Müller, Maxie Luise; Hetz, Hannah; Ehmke, Heimo

    2014-03-01

    A network of kinases, including WNKs, SPAK and Sgk1, is critical for the independent regulation of K+ and Na+ transport in the distal nephron. Angiotensin II is thought to act as a key hormone in orchestrating these kinases to switch from K+ secretion during hyperkalaemia to Na+ reabsorption during intravascular volume depletion, thus keeping disturbances in electrolyte and blood pressure homeostasis at a minimum. It remains unclear, however, how K+ and Na+ transport are regulated during a high Na+ intake, which is associated with suppressed angiotensin II levels and a high distal tubular Na+ load. We therefore investigated the integrated blood pressure, renal, hormonal and gene and protein expression responses to large changes of K+ intake in Na+ replete mice. Both low and high K+ intake increased blood pressure and caused Na+ retention. Low K+ intake was accompanied by an upregulation of the sodium-chloride cotransporter (NCC) and its activating kinase SPAK, and inhibition of NCC normalized blood pressure. Renal responses were unaffected by angiotensin AT1 receptor antagonism, indicating that low K+ intake activates the distal nephron by an angiotensin-independent mode of action. High K+ intake was associated with elevated plasma aldosterone concentrations and an upregulation of the epithelial sodium channel (ENaC) and its activating kinase Sgk1. Surprisingly, high K+ intake increased blood pressure even during ENaC or mineralocorticoid receptor antagonism, suggesting the contribution of aldosterone-independent mechanisms. These findings show that in a Na+ replete state, changes in K+ intake induce specific molecular and functional adaptations in the distal nephron that cause a functional coupling of renal K+ and Na+ handling, resulting in Na+ retention and high blood pressure when K+ intake is either restricted or excessively increased.

  16. Changes in Intracellular Na+ following Enhancement of Late Na+ Current in Virtual Human Ventricular Myocytes

    Science.gov (United States)

    Giles, Wayne R.

    2016-01-01

    The slowly inactivating or late Na+ current, INa-L, can contribute to the initiation of both atrial and ventricular rhythm disturbances in the human heart. However, the cellular and molecular mechanisms that underlie these pro-arrhythmic influences are not fully understood. At present, the major working hypothesis is that the Na+ influx corresponding to INa-L significantly increases intracellular Na+, [Na+]i; and the resulting reduction in the electrochemical driving force for Na+ reduces and (may reverse) Na+/Ca2+ exchange. These changes increase intracellular Ca2+, [Ca2+]i; which may further enhance INa-L due to calmodulin-dependent phosphorylation of the Na+ channels. This paper is based on mathematical simulations using the O’Hara et al (2011) model of baseline or healthy human ventricular action potential waveforms(s) and its [Ca2+]i homeostasis mechanisms. Somewhat surprisingly, our results reveal only very small changes (≤ 1.5 mM) in [Na+]i even when INa-L is increased 5-fold and steady-state stimulation rate is approximately 2 times the normal human heart rate (i.e. 2 Hz). Previous work done using well-established models of the rabbit and human ventricular action potential in heart failure settings also reported little or no change in [Na+]i when INa-L was increased. Based on our simulations, the major short-term effect of markedly augmenting INa-L is a significant prolongation of the action potential and an associated increase in the likelihood of reactivation of the L-type Ca2+ current, ICa-L. Furthermore, this action potential prolongation does not contribute to [Na+]i increase. PMID:27875582

  17. Tecnologia simplificada na enfermagem materno infantil

    Directory of Open Access Journals (Sweden)

    Selma Campestrini

    1991-09-01

    Full Text Available A autora apresenta três modelos de tecnologia simplificada da enfermagem materno infantil: o equipamento didático SEIO COBAIA para treinar exercícios e massagens da mama e mamilo; a peça indumentária SUPRETRAUMA - sutiã preventivo de traumatismo mamilar - usado por gestantes; e, a técnica para reverter mamilo umbilicado durante o puerperio imediato. Além de corroborar na promoção do aleitamento materno e na prevenção de desmame precoce, demonstra a possibilidade da enfermagem relacionar o saber teórico-científico com o saber tecnico-prático, na saúde da mulher e da criança, com tecnologia adequada às necessidades, à compreensão e ao bem estar da população.

  18. Labirintos na cidade contemporânea

    Directory of Open Access Journals (Sweden)

    Edson Luiz André de Sousa

    Full Text Available Este artigo pretende tensionar pontos de conexão e diluição de fronteiras entre as categorias público/privado, conversando com a literatura de Baudelaire e W. Benjamin, Fredric Jamenson e Marc Augé. Através da imagem do labirinto, símbolo da cidade antiga que se quis extinguir na cidade moderna, busca-se refletir sobre alguns caminhos e caminhantes considerados excedentes na cidade contemporânea. O cenário propulsor dessa reflexão é a experiência do jornal Boca de Rua, elaborado por moradores de rua na cidade de Porto Alegre.

  19. Recent results from MoNA-LISA

    Science.gov (United States)

    Spyrou, Artemisia

    2012-03-01

    Studies of the nuclear properties of nuclei close and even beyond the limits of stability have revealed exotic modes of decay and new structural characteristics. The MoNA-LISA array is used at the National Superconducting Cyclotron Laboratory at Michigan State University to study nuclei along the neutron dripline. In a typical experiment, a radioactive beam is employed to produce the neutron-unbound state of interest. This state/resonance immediately decay into a neutron, which is detected by MoNA-LISA and a remaining charged nucleus detected by the sweeper magnet detector suite. In this talk, new exciting findings from recent MoNA-LISA experiments will be presented. These include the first observation of a dineutron decay from ^16Be, the exploration of the ``south shore'' of the Island of Inversion and the first evidence of the decay of the troubling nucleus ^26O.

  20. Rastreabilidade de componentes na cadeia de fornecimento

    OpenAIRE

    2005-01-01

    Como pouco se conhece sobre a aplicação e uso da tecnologia de RFID (Identificação por rádio frequência) na Identificação automática e recolha e dados de componentes na cadeia de fornecimento num contexto de rastreabilidade, o presente trabalho visa procurar conhecer melhor os fenómenos em estudo através de novas questões, novas explicações, tentando indagar as características e as alterações que esta tecnologia irá provocar na gestão da cadeia de fornecimento. A cadeia d...

  1. Knjige o kartografskim projekcijama na internetu

    Directory of Open Access Journals (Sweden)

    Nedjeljko Frančula

    2011-12-01

    Full Text Available U ovom prikazu skrećemo pozornost na neke knjige o kartografskim projekcijama koje su prvobitno objavljene u tisku, a potom digitalizirane i besplatno stavljene na mrežu. Neke od tih knjiga nude se na mreži kao Google e-knjige. Google godinama skuplja knjige kojima su istekla autorska prava i digitalizira ih. Fotografira se svaka stranica te zatim spaja u jednu veliku fotografiju iz koje se izvlači tekst softverom OCR. Google čuva originalnu digitalnu fotografiju u svom arhivu, a izvučeni tekst pretvara u formate HTML, PDF ili EPUB. Google danas nudi više od milijun besplatnih e-knjiga (http://www.google.com/books.

  2. UTJECAJ GMO NA EKOLOŠKU POLJOPRIVREDU

    OpenAIRE

    Fagan, John

    2008-01-01

    Gotovo svi znanstvenici se slažu da su danas uobičajene metode za ugradnju novog gena u genom biljke putem genetičkog inženjerstva (genetičke modifikacije): (1) neprecizne i slučajne, (2) pa je njihov utjecaj na biološke funkcije biljke nepredvidiv, (3) a neželjeni učinci GMO na zdravlje konzumenta i na okoliš mogući. Korištenje GMO u ekološkoj poljoprivredi je zabranjeno, stoga potrošač vjeruje da oznaka “ekološki” zakonski štiti od prisustva GMO u hrani. Međutim, povećano korištenje GMO u k...

  3. Eletrencefalograma na síndrome parkinsoniana

    Directory of Open Access Journals (Sweden)

    José Geraldo Camargo Lima

    1973-09-01

    Full Text Available Foram estudados os eletrencefalogramas de 50 pacientes parkinsonianos livres de qualquer antecedente convulsivo, sendo registrados traçados anormais em 40% dos casos. A incidência de traçados anormais foi maior na síndrome parkinsoniana bilateral do que na unilateral (52% e 25%, respectivamente. Entre as anormalidades assinaladas foram as paroxísticas as mais freqüentes (65% dos casos, caracterizando-se predominantemente por surtos de ondas teta. O registro de anormalidades paroxísticas do tipo irritativo encontrado em três casos é salientado. Alterações da atividade de base foram assinaladas em 35% dos pacientes. A idade dos pacientes não parece ter tido importante papel na gênese das anormalidades eletrencefalográficas.

  4. Recent results from NA61/SHINE

    CERN Document Server

    Kowalski, Seweryn

    2015-01-01

    The aim of the NA61/SHINE ion programme is to explore the QCD phase diagram within the range of thermodynamical variables accessible by the SPS. Moreover the experiment provides precision hadron production measurements to improve computation of neutrino fluxes in neutrino oscillation experiments and for improving air shower simulations of cosmic-ray experiments. The main physics goals of the NA61/SHINE ion programme are the study of the properties of the onset of deconfinement and the search for signatures of the critical point of strongly interacting matter. These goals are pursued by performing an energy (beam momentum 13A – 158 A GeV/c) and system size (p+p, p+Pb, Be+Be, Ar+Sc, Xe+La) scan. This paper reviews the status and results of the NA61/SHINE experiment.

  5. 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.

  6. Diffusion of propylene adsorbed in Na-Y and Na-ZSM5 zeolites: Neutron scattering and FTIR studies

    Indian Academy of Sciences (India)

    S Gautam; A K Tripathi; V S Kamble; S Mitra; R Mukhopadhyay

    2008-11-01

    Here we report the quasielastic neutron scattering and FTIR studies on the dynamics of propylene adsorbed in Na-Y and Na-ZSM5 zeolites. QENS data show that although the mechanism of translational motion of propylene is jump diffusion in both the cases of Na-Y and Na-ZSM5 zeolites, the diffusivity is affected by the host size and is hindered in the case of Na-ZSM5. FTIR studies showed that guest–host interaction in Na-ZSM5 is stronger than that in Na-Y zeolite corroborating the QENS results.

  7. Concentration dependence of Li+/Na+ diffusion in manganese hexacyanoferrates

    Science.gov (United States)

    Takachi, Masamitsu; Fukuzumi, Yuya; Moritomo, Yutaka

    2016-06-01

    Manganese hexacyanoferrates (Mn-HCFs) with a jungle-gym-type structure are promising cathode materials for Li+/Na+ secondary batteries (LIBs/SIBs). Here, we investigated the diffusion constants D Li/D Na of Li+/Na+ against the Li+/Na+ concentration x Na/x Li and temperature (T) of A 1.32Mn[Fe(CN)6]0.833.6H2O (A = Li and Na). We evaluated the activation energy E\\text{a}\\text{Li}/E\\text{a}\\text{Na} of D Li/D Na against x Na/x Li. We found that E\\text{a}\\text{Na} steeply increases with x Na from 0.41 eV at x Na = 0.69 to 0.7 eV at 1.1. The increase in E\\text{a}\\text{Na} is ascribed to the occupancy effect of the Na+ site. The increase in E\\text{a}\\text{Li} is suppressed, probably because the number of Li+ sites is three times that of Na+ sites.

  8. UPORABA TEHNOLOGIJE VOIP NA MOBILNIH NAPRAVAH SYMBIAN

    OpenAIRE

    Uršič, Tine

    2013-01-01

    V sklopu diplomskega dela smo razvili aplikacijo, katere cilj je nižanje stroškov klicev s pomočjo tehnologije VoIP. Ta za komunikacijo uporablja protokol IP in zaobide potrebo po navadnih in dražjih GSM klicih. V času načrtovanja aplikacije je bilo okolje Symbian najbolj razširjena mobilna platforma za dovolj zmogljive, t.i. »pametne telefone«, ki lahko poganjajo VoIP aplikacije. Izbrali smo skupek knjižnic, poimenovanih Qt, ki omogočajo enostavno prenosljivost na druge platforme. Podr...

  9. Recent results and prospects from NA62

    Directory of Open Access Journals (Sweden)

    Bizzeti Andrea

    2016-01-01

    K+ → π+ vv̄ is a theoretically very clean decay where indirect effects of new physics may be detectable. The NA62 apparatus has been significantly upgraded between 2008 and 2014 in order to measure the branching ratio of this decay with 10% precision. The NA62 experiment took data with the new setup in pilot runs in 2014 and 2015, reaching the design beam intensity. Results of first data quality studies in view of the 2016-2017 physics runs are presented.

  10. ARTE E TRANSGRESSÃO NA MODERNIDADE

    OpenAIRE

    Cascelli Farinasso, Gabriela

    2014-01-01

    O presente artigo busca explorar a arte como ferramenta para mudanças sociais na modernidade relacionando-a com os conceitos apresentados por Nicolas Bourriaud em seu livro Estética Relacional. A Street Art é apresentada como recorte dentre os movimentos artísticos, ressaltando-se sua importância e suas características do ponto de vista espacial e temporal e na criação de “lugares de pausa” no meio urbano, que levam o observador a refletir sobre a obra e o desviam do seu percurso. A transgres...

  11. Abordagem neurologica na sindrome do X fragil

    OpenAIRE

    Marilisa Mantovani Guerreiro

    1993-01-01

    Resumo: Com o propósito de realizar a abordagem neurológica na Síndrome do X Frágil (SXF), estudaram-se 11 pacientes com este diagnóstico citogenético. A idade variou de 8 a 19 anos. Nove pacientes eram do sexo masculino e dois do feminino. Todos os indivíduos apresentaram pavilhões auriculares grandes e faces alongadas. Observou-se fronte proeminente em 63% dos casos e macrorquidia em 33% dentre aqueles do sexo masculino. Atraso na aquisição da fala, fala repetitiva, perseverativa, impulsiva...

  12. O problema do conhecimento verdadeiro na epidemiologia

    Directory of Open Access Journals (Sweden)

    Ayres José Ricardo de Carvalho Mesquita

    1992-01-01

    Full Text Available São examinadas as bases filosóficas da validação do conhecimento científico, com o intuito de estabelecer uma visão crítica a respeito da adoção das proposições de Popper na epidemiologia. Ressalta-se o caráter conservador que resulta das limitações técnicas implicadas na sua adoção, não obstante o evidente aumento da racionalidade e da criatividade heurística que propicia.

  13. Status for 2017, CERN NA63

    CERN Document Server

    Uggerhoej, UI

    2017-01-01

    In the NA63 experiment of May-June 2017 the purpose was to look for the effect of classical radiation reaction as described in \\cite{DiPiazza20171} but for 50 GeV positrons aligned to the (110) plane of silicon crystals of varying thicknesses in the range 1-6 mm. The data which was taken during the run shows promising results, but the final verdict awaits accurate calculations of the theoretically expected spectra, and a final analysis. For the 2016 results on quantum radiation reaction obtained by CERN NA63, we have submitted a manuscript, which is presently under refereeing \\cite{Wist17}.

  14. Dificuldades de aprendizagem na leitura e na escrita: o contributo de jogos eletrónicos na motivação e na aprendizagem

    OpenAIRE

    Nogueira, Joana Maria Duarte

    2015-01-01

    Projeto de Intervenção apresentado à Escola Superior de Educação de Lisboa para obtenção do grau de Mestre em Educação Especial, Especialização em Problemas de Aprendizagem e Comportamento A dislexia carateriza-se por habilidades alteradas dos processos de leitura (fluência, compreensão e leitura correta de palavras). Além destas pode envolver ainda dificuldades no reconhecimento de palavras escritas, na descodificação, na adequação e habilidades ortográficas, podendo ainda manifestar-se n...

  15. Qualidade de vida sexual na menopausa

    OpenAIRE

    2011-01-01

    A Qualidade de Vida Sexual é um termo habitualmente usado, para abranger aspectos relacionados com a ausência ou presença de problemas sexuais, satisfação e bem-estar sexual, sendo esta bastante subjectiva. Neste sentido, é fundamental rememorar que a presença de problemas sexuais não é, de todo sinónimo de má qualidade de vida sexual. Na verdade, a sexualidade na menopausa inclui, igualmente, sexo, relaxamento, comunicação e intimidade partilhada entre o casal, como em qualquer outra etapa d...

  16. SoLid: Search for Oscillation with a 6Li Detector at the BR2 research reactor

    CERN Document Server

    Michiels, Ianthe

    2016-01-01

    In the past decades, various nuclear reactor neutrino experiments have measured a deficit in the flux of antineutrinos coming from the reactor at short reactor-detector distances, when compared to theoretical calculations. One of the experiments designed to investigate this reactor antineutrino anomaly is the SoLid experiment. It uses the compact BR2 research reactor from the SCK-CEN in Mol, Belgium, to perform reactor antineutrino flux measurements at very short baseline. These proceedings discuss the general detection concepts of the SoLid experiment and its novel detector technology. The performance of the SoLid design is demonstrated with some results of the analysis of the data gathered with the experiment's first large scale test module, SM1.

  17. All-optical production and transport of a large $^6$Li quantum gas in a crossed optical dipole trap

    CERN Document Server

    Gross, Ch; Dieckmann, K

    2016-01-01

    We report on an efficient production scheme for a large quantum degenerate sample of fermionic lithium. The approach is based on our previous work on narrow-line $ 2S_{1/2}\\rightarrow 3P_{3/2} $ laser cooling resulting in a high phase-space density of up to $3\\times10^{-4}$. This allows utilizing a large volume crossed optical dipole trap with a total power of $45\\,\\textrm{W}$, leading to high loading efficiency and $8\\times10^6$ trapped atoms. The same optical trapping configuration is used for rapid adiabatic transport over a distance of $25\\,\\textrm{cm}$ in $0.9\\,\\textrm{s}$, and subsequent evaporative cooling. With optimized evaporation we achieve a degenerate Fermi gas with $1.7\\times 10^{6}$ atoms at a temperature of $60 \\, \\textrm{nK}$, corresponding to $T/T_{\\text{F}}=0.16\\left(2 \\right)$. Furthermore, the performance is demonstrated by evaporation near a broad Feshbach resonance creating a molecular Bose-Einstein condensate of $3\\times10^5$ lithium dimers.

  18. Probing luminescence centers in Na rich feldspar

    DEFF Research Database (Denmark)

    Prasad, Amit Kumar; Lapp, Torben; Kook, Myung Ho;

    2016-01-01

    our understanding of the luminescence mechanisms and recombination sites, in a sample of Na rich plagioclase feldspar (oligoclase). Both the UV and violet–blue emissions show resonant excitations arising from a distribution of energy levels. We propose, contrary to the general understanding...

  19. Trapping of radioactive {sup 21}Na

    Energy Technology Data Exchange (ETDEWEB)

    Kruithof, Wilbert L.; Hoek, Duurt J. van der; Giri, Gouri S.; Hoekstra, Ronnie; Hoekstra, Steven; Jungmann, Klaus; Onderwater, Gerco; Santra, Bodhaditya; Shildling, Praveen D.; Sohani, Moslem; Versolato, Oscar O.; Willmann, Lorenz; Wilschut, Hans W. [Kernfysisch Versneller Instituut, University Groningen (Netherlands)

    2010-07-01

    Radioactive {sup 21}Na atoms in a magneto-optical trap (MOT) provide an excellent opportunity to search for non-Standard Model contributions in the weak interactions. In particular, correlations between the {beta}-particle and the neutrino are sensitive to time reversal symmetry violating effects. The Na isotope is produced at the TRI{mu}P facility of the KVI using intense {sup 20}Ne beams from the AGOR cyclotron on a cooled deuterium target. The isotopes are stopped and re-thermalized in a Thermal Ionizer. They are transported as a low energy ion beam to a MOT cell where they are neutralized and subsequently captured by laser light. The trapped Na atoms will be transferred to a second MOT which is placed inside a reaction microscope to measure the momentum distribution of the recoiling daughter nuclei after the {beta}-decay. The {beta}-particle will be detected in a scintillation detector. These two devices have been characterized. A pulsed UV laser was used to ionize trapped Na atoms in order to simulate the {beta}-decay in the reaction microscope. The momentum distribution of the recoil ions is measured. The setup of the whole experiment will be presented.

  20. Pijn tijdens of na de wortelkanaalbehandeling

    NARCIS (Netherlands)

    Wesselink, P.R.

    2012-01-01

    Een wortelkanaalbehandeling kan pijn veroorzaken tijdens en/of na de behandeling. Tijdens de behandeling moet dan onderscheid worden gemaakt tussen pijn bij een pulpitis en pijn bij een necrotische pulpa. In beide gevallen kan die pijn effectief worden bestreden, afhankelijk van de toestand waarin h

  1. NA48: Wiring up for Change

    CERN Multimedia

    2001-01-01

    The NA48 Collaboration is rebuilding its drift chambers ready for the experiment to start up again this coming July. An intricate task involving the soldering of over 24,000 wires! The future of the NA48 experiment is coming right down to the wire, that is, the wires which the Collaboration is installing in the clean room of Hall 887 on the Prévessin site. Six days a week, technicians are working in shifts to rebuild the experiment's drift chambers. The original chambers were damaged when a section of a vacuum tube imploded at the end of 1999. A year ago, CERN gave the green light for this essential part of the spectrometer to be rebuilt, so the NA48 experiment, which studies CP violation (see box), still has a bright future ahead of it. Three years of data-taking ahead The NA48 experiment aims to penetrate the secrets of CP (Charge Parity) violation. Charge and parity are two parameters which distinguish a particle from an antiparticle. In other words, an electron possesses a negative electric ...

  2. Habitus professoral na sala de aula virtual

    Directory of Open Access Journals (Sweden)

    Alexandre Marinho Pimenta

    2014-09-01

    Full Text Available Entendendo que a indiferença na ação pedagógica contribui para a reprodução das desigualdades no sistema de ensino, o presente artigo busca captar, a partir de entrevistas semiestruturadas, traços do habitus de professores supervisores de disciplinas do curso de Licenciatura em Pedagogia na modalidade a distância na Universidade de Brasília - UnB no âmbito do Sistema Universidade Aberta do Brasil - UAB. As orientações metodológicas de Bourdieu (2007 foram um dos elementos orientadores na análise das entrevistas, considerando ainda o uso heurístico do conceito de habitus. Conclui-se que o habitus professoral envolve esforços voluntários em busca de uma ação pedagógica diferenciada. No entanto, ele é ambíguo e condescendente frente aos limites do modelo de EaD no âmbito da UAB. Ao fim, os dados analisados permitem fornecer elementos para reorientação político-pedagógica que vise a um novo modelo de EaD nacional.

  3. Electronic Polarisability of NaNO2-NaNO3 and NaOH-NaNO3 Ionic Melts and Effective Ionic Radius of OH-

    Science.gov (United States)

    Iwadate, Yasuhiko; Ohnishi, Ryosuke; Ohkubo, Takahiro

    2017-01-01

    Molar volumes and refractive indexes of molten NaNO2-NaNO3 and NaOH-NaNO3 systems were measured by dilatometry and goniometry, respectively. The molar volumes of both systems increased with increasing temperature. Refractive indexes decreased with a rise of temperature or with increasing wavelength of the incident visible light. Assuming that the electronic polarisability is inherent in an ion, the electronic polarisability of a OH- ion in the melt was estimated from the Lorentz-Lorenz equation to be 1.26×10-30 m3, being comparable with that in the crystal. The effective ionic radius of a OH- ion was evaluated from the obtained electronic polarisability to be 1.34×10-10 m, using the correlation between the third power of the ionic radius and the electronic polarisability of an ion so far reported. The effective ionic radius obtained in this work was in good agreement with that assigned by Shannon.

  4. NA49: lead-lead collision

    CERN Multimedia

    1996-01-01

    This is an image of an actual lead ion collision taken from tracking detectors on the NA49 experiment, part of the heavy ion project at CERN. These collisions produce a very complicated array of hadrons as the heavy ions break up. It is hoped that one of these collisions will eventually create a new state of matter known as quark-gluon plasma.

  5. Categoria de gênero na enfermagem

    Directory of Open Access Journals (Sweden)

    Alcione Leite da Silva

    1999-03-01

    Full Text Available Este estudo teve por objetivo analisar as categorias de gênero, a partir de periódicos sobre estudo de gênero na enfermagem brasileira. Usando uma abordagem exploratória, analisamos os artigos na área, publicados em dez periódicos nacionais de enfermagem, no período de 1955 a 1997/1. Com base na análise dos discursos, as categorias centrais para as quais convergiram as atenções das/os autoras/es foram: gênero e determinantes históricos e sociais no desenvolvimento da profissão de enfermagem, gênero e trabalho, gênero e saúde, gênero e educação e gênero e feminismo. Outras perspectivas importantes, menos enfatizadas, mas emergentes na literatura de enfermagem foram: gênero e cuidado, gênero e família, gênero e violência.

  6. Concentratie gewasbeschermingsmiddelen na verhitting dompelbad bloembollen

    NARCIS (Netherlands)

    Bulle, A.A.E.; Lans, van der A.M.; Aanholt, van J.T.M.

    2014-01-01

    De meest gebruikte methode van ontsmetting van bloembollen en –knollen is een dompeling in een mix van fungiciden. In het proces van bolontsmetting worden partijen bollen na elkaar ontsmet in hetzelfde dompelbad. Met een partij bollen kan een dompelbad behoorlijk vervuild raken met bijvoorbeeld (ste

  7. Pijn tijdens of na de wortelkanaalbehandeling

    NARCIS (Netherlands)

    Wesselink, P.R.

    2012-01-01

    Een wortelkanaalbehandeling kan pijn veroorzaken tijdens en/of na de behandeling. Tijdens de behandeling moet dan onderscheid worden gemaakt tussen pijn bij een pulpitis en pijn bij een necrotische pulpa. In beide gevallen kan die pijn effectief worden bestreden, afhankelijk van de toestand waarin

  8. Recent results and prospects from NA62

    Science.gov (United States)

    Bizzeti, Andrea

    2016-11-01

    A large sample of charged kaon decays in 2007 has been collected by the NA62 experiment at CERN SPS using the experimental setup of the former NA48 experiment. Its intense kaon beam provides an abundant source of tagged neutral pions in vacuum. A measurement of the electromagnetic transition form factor slope of the neutral pion from 1:05 × 106 fully reconstructed π0 Dalitz decays is presented. The obtained preliminary value a = (3.70 ± 0.53stat ± 0.36syst) × 10-2 is the first 5.8σ observation of a non-zero slope in the time-like region of momentum transfer. K+ → π+ vv¯ is a theoretically very clean decay where indirect effects of new physics may be detectable. The NA62 apparatus has been significantly upgraded between 2008 and 2014 in order to measure the branching ratio of this decay with 10% precision. The NA62 experiment took data with the new setup in pilot runs in 2014 and 2015, reaching the design beam intensity. Results of first data quality studies in view of the 2016-2017 physics runs are presented.

  9. Water transport by the renal Na(+)-dicarboxylate cotransporter

    DEFF Research Database (Denmark)

    Meinild, A K; Loo, D D; Pajor, A M;

    2000-01-01

    This study investigated the ability of the renal Na(+)-dicarboxylate cotransporter, NaDC-1, to transport water. Rabbit NaDC-1 was expressed in Xenopus laevis oocytes, cotransporter activity was measured as the inward current generated by substrate (citrate or succinate), and water transport...... was monitored by the changes in oocyte volume. In the absence of substrates, oocytes expressing NaDC-1 showed an increase in osmotic water permeability, which was directly correlated with the expression level of NaDC-1. When NaDC-1 was transporting substrates, there was a concomitant increase in oocyte volume....... This solute-coupled influx of water took place in the absence of, and even against, osmotic gradients. There was a strict stoichiometric relationship between Na(+), substrate, and water transport of 3 Na(+), 1 dicarboxylate, and 176 water molecules/transport cycle. These results indicate that the renal Na...

  10. Water transport by the renal Na(+)-dicarboxylate cotransporter

    DEFF Research Database (Denmark)

    Meinild, A K; Loo, D D; Pajor, A M

    2000-01-01

    was monitored by the changes in oocyte volume. In the absence of substrates, oocytes expressing NaDC-1 showed an increase in osmotic water permeability, which was directly correlated with the expression level of NaDC-1. When NaDC-1 was transporting substrates, there was a concomitant increase in oocyte volume....... This solute-coupled influx of water took place in the absence of, and even against, osmotic gradients. There was a strict stoichiometric relationship between Na(+), substrate, and water transport of 3 Na(+), 1 dicarboxylate, and 176 water molecules/transport cycle. These results indicate that the renal Na......This study investigated the ability of the renal Na(+)-dicarboxylate cotransporter, NaDC-1, to transport water. Rabbit NaDC-1 was expressed in Xenopus laevis oocytes, cotransporter activity was measured as the inward current generated by substrate (citrate or succinate), and water transport...

  11. Presoja notranjih kontrol pri obračunu davka na dodano vrednost na primeru "Podjetja x"

    OpenAIRE

    Majcen, Borut

    2016-01-01

    Poslovanje podjetja si je ob odsotnosti notranjih kontrol nemogoče predstavljati. Podjetja so podvržena raznim tveganjem, še posebej v današnjih razmerah globalnega poslovanja, ko se podjetja soočajo z vedno novimi izzivi, kar prinaša tudi nova tveganja. Najučinkovitejši ukrep za obvladovanje tveganj predstavlja vzpostavitev sistema notranjih kontrol. Obvladovanje tveganj pa ne poteka samo na ravni podjetja kot celote, ampak je prisotno na vseh področjih delovanja podjetja, torej tudi na p...

  12. Biossegurança na odontologia

    Directory of Open Access Journals (Sweden)

    André Luiz Dantas Bezerra

    2014-04-01

    Full Text Available Introdução: As atividades laborais, de modo geral, expõem os trabalhadores a riscos ocupacionais dos mais variados. Esses riscos incluem agentes físicos, químicos, ergonômicos, de acidentes e biológicos. O contato rotineiro com esses últimos deve ser motivo de reflexão e intervenção. Objetivo: Descrever os aspectos da biossegurança na odontologia. Métodos: Foi realizada uma revisão do estado da arte, adotando-se critérios para análise dos trabalhos mais diretamente relacionados à prática odontológica. A partir dos descritores controlados (DeCS "biossegurança" e "odontologia", procederam-se a busca na Literatura Latino-Americana e do Caribe em Ciências da Saúde, na Scientific Electronic Library Online, na National Library of Medicine e na Biblioteca Cochrane. Resultados: Com a associação entre os DeCS, chegou-se a 66 artigos, porém, após refinamento foram incluídos nesta revisão 12 artigos. Nos resultados foi evidenciado que a produção científica sobre biossegurança é vasta, bem como é ampla na odontologia, contudo, quando da concentração de trabalhos contempladores da associação dos termos biossegurança e odontologia, a quantidade de estudos diminui consideravelmente. Não obstante, as pesquisas foram, em sua maioria, desenvolvidas por estudiosos nacionais, da região nordeste e evidenciaram que o conhecimento e a adoção de medidas de segurança biológica na área ainda são insuficientes para garantir a proteção da equipe e dos pacientes qualitativamente. Conclusão: Sugere-se que as normas de precaução padrão sejam seguidas rigidamente e que ações de educação sejam promovidas entre os profissionais.

  13. Effects of non-uniform root zone salinity on water use, Na+ recirculation, and Na+ and H+ flux in cotton.

    Science.gov (United States)

    Kong, Xiangqiang; Luo, Zhen; Dong, Hezhong; Eneji, A Egrinya; Li, Weijiang

    2012-03-01

    A new split-root system was established through grafting to study cotton response to non-uniform salinity. Each root half was treated with either uniform (100/100 mM) or non-uniform NaCl concentrations (0/200 and 50/150 mM). In contrast to uniform control, non-uniform salinity treatment improved plant growth and water use, with more water absorbed from the non- and low salinity side. Non-uniform treatments decreased Na(+) concentrations in leaves. The [Na(+)] in the '0' side roots of the 0/200 treatment was significantly higher than that in either side of the 0/0 control, but greatly decreased when the '0' side phloem was girdled, suggesting that the increased [Na(+)] in the '0' side roots was possibly due to transportation of foliar Na(+) to roots through phloem. Plants under non-uniform salinity extruded more Na(+) from the root than those under uniform salinity. Root Na(+) efflux in the low salinity side was greatly enhanced by the higher salinity side. NaCl-induced Na(+) efflux and H(+) influx were inhibited by amiloride and sodium orthovanadate, suggesting that root Na(+) extrusion was probably due to active Na(+)/H(+) antiport across the plasma membrane. Improved plant growth under non-uniform salinity was thus attributed to increased water use, reduced leaf Na(+) concentration, transport of excessive foliar Na(+) to the low salinity side, and enhanced Na(+) efflux from the low salinity root.

  14. Synthesis of Na-A and/or Na-X zeolite/porous carbon composites from carbonized rice husk

    Science.gov (United States)

    Katsuki, Hiroaki; Komarneni, Sridhar

    2009-07-01

    Na-A and/or Na-X zeolite/porous carbon composites were prepared under hydrothermal conditions by NaOH dissolution of silica first from carbonized rice husk followed by addition of NaAlO 2 and in situ crystallization of zeolites i.e., using a two-step process. When a one-step process was used, both Na-A and Na-X zeolites crystallized on the surface of carbon. Na-A or Na-X zeolite crystals were prepared on the porous carbonized rice husk at 90 °C for 2-6 h by changing the SiO 2/Al 2O 3, H 2O/Na 2O and Na 2O/SiO 2 molar ratios of precursors in the two-step process. The surface area and NH 4+-cation exchange capacity (CEC) of Na-A zeolite/porous carbon were found to be 171 m 2/g and 506 meq/100 g, respectively, while those of Na-X zeolite/porous carbon composites were 676 m 2/g and 317 meq/100 g, respectively. Na-A and Na-X zeolites are well-known microporous and hydrophilic materials while carbonized rice husk was found to be mesoporous (pores of ˜3.9 nm) and hydrophobic. These hybrid microporous-mesoporous and hydrophilic-hydrophobic composites are expected to be useful for decontamination of metal cations as well as organic contaminants simultaneously.

  15. Phase Equilibria of Quaternary SystemNaCl-NaBr-Na2B4O7-H2O at 348 K

    Institute of Scientific and Technical Information of China (English)

    LI Ting; SANG Shi-hua; CUI Rui-zhi; ZHANG Kai-jie

    2013-01-01

    The phase equilibria of quatemary system NaC1-NaBr-Na2B4O7-H2O at 348 K were studied by the isothermal equilibrium method.The solubilities and densities of the equilibrium solution were determined.According to the experimental data,the phase diagram,density-composition diagrams and water content diagram of the quaternary system at 348 K were plotted respectively.And the phase diagram consists of one univariant curve,two crystallization fields and without any invariant point of the quaternary system.The equilibrium solid phases of the two crystallization fields were Na(C1,Br) and Na2B4O7·SH2O.The experimental results show that the quaternary system contained solid solution.The densities of the solution decrease with increasing NaC1 concentration and increase with increasing NaBr concentration.

  16. Asphericity in the Fermi Surface and Fermi Energy of Na-K, Na-Rb and Na-Cs Binary Alloys

    Institute of Scientific and Technical Information of China (English)

    Minal H. Patel; A.M. Vora; P.N. Gajjar; A.R. Jani

    2002-01-01

    Detailed theoretical investigations into asphericity in the Fermi surface (FS) and Fermi energy (FE) ofNa1_xKx, Na1_xRbx, and Na1_xCsx binary solid solutions are carried out for the first time. The alloying behavior ofthe K, Rb, and Cs with the Na generates the Fermi surface distortion (FSD) of bce simple metals. The FS of Na-K,Na-Rb, and Na-Cs solid solution is a distorted sphere with the largest deviation along [110]. We have found that theimpact of local-field correction function on FSD is maximun at [100] point and minimum at [111] point. The exchangeand correlation effect is found to suppress the value of FE.

  17. $^{24}$Mg($p$, $\\alpha$)$^{21}$Na reaction study for spectroscopy of $^{21}$Na

    CERN Document Server

    Cha, S M; Kim, A; Lee, E J; Ahn, S; Bardayan, D W; Chipps, K A; Cizewski, J A; Howard, M E; Manning, B; O'Malley, P D; Ratkiewicz, A; Strauss, S; Kozub, R L; Matos, M; Pain, S D; Pittman, S T; Smith, M S; Peters, W A

    2015-01-01

    The $^{24}$Mg($p$, $\\alpha$)$^{21}$Na reaction was measured at the Holifield Radioactive Ion Beam Facility at Oak Ridge National Laboratory in order to better constrain spins and parities of energy levels in $^{21}$Na for the astrophysically important $^{17}$F($\\alpha, p$)$^{20}$Ne reaction rate calculation. 31 MeV proton beams from the 25-MV tandem accelerator and enriched $^{24}$Mg solid targets were used. Recoiling $^{4}$He particles from the $^{24}$Mg($p$, $\\alpha$)$^{21}$Na reaction were detected by a highly segmented silicon detector array which measured the yields of $^{4}$He particles over a range of angles simultaneously. A new level at 6661 $\\pm$ 5 keV was observed in the present work. The extracted angular distributions for the first four levels of $^{21}$Na and Distorted Wave Born Approximation (DWBA) calculations were compared to verify and extract angular momentum transfer.

  18. Regulation of cardiac myocyte contractility by phospholemman: Na+/Ca2+ exchange versus Na+ -K+ -ATPase.

    Science.gov (United States)

    Song, Jianliang; Zhang, Xue-Qian; Wang, JuFang; Cheskis, Ellina; Chan, Tung O; Feldman, Arthur M; Tucker, Amy L; Cheung, Joseph Y

    2008-10-01

    Phospholemman (PLM) regulates cardiac Na(+)/Ca(2+) exchanger (NCX1) and Na(+)-K(+)-ATPase in cardiac myocytes. PLM, when phosphorylated at Ser(68), disinhibits Na(+)-K(+)-ATPase but inhibits NCX1. PLM regulates cardiac contractility by modulating Na(+)-K(+)-ATPase and/or NCX1. In this study, we first demonstrated that adult mouse cardiac myocytes cultured for 48 h had normal surface membrane areas, t-tubules, and NCX1 and sarco(endo)plasmic reticulum Ca(2+)-ATPase levels, and retained near normal contractility, but alpha(1)-subunit of Na(+)-K(+)-ATPase was slightly decreased. Differences in contractility between myocytes isolated from wild-type (WT) and PLM knockout (KO) hearts were preserved after 48 h of culture. Infection with adenovirus expressing green fluorescent protein (GFP) did not affect contractility at 48 h. When WT PLM was overexpressed in PLM KO myocytes, contractility and cytosolic Ca(2+) concentration ([Ca(2+)](i)) transients reverted back to those observed in cultured WT myocytes. Both Na(+)-K(+)-ATPase current (I(pump)) and Na(+)/Ca(2+) exchange current (I(NaCa)) in PLM KO myocytes rescued with WT PLM were depressed compared with PLM KO myocytes. Overexpressing the PLMS68E mutant (phosphomimetic) in PLM KO myocytes resulted in the suppression of I(NaCa) but had no effect on I(pump). Contractility, [Ca(2+)](i) transient amplitudes, and sarcoplasmic reticulum Ca(2+) contents in PLM KO myocytes overexpressing the PLMS68E mutant were depressed compared with PLM KO myocytes overexpressing GFP. Overexpressing the PLMS68A mutant (mimicking unphosphorylated PLM) in PLM KO myocytes had no effect on I(NaCa) but decreased I(pump). Contractility, [Ca(2+)](i) transient amplitudes, and sarcoplasmic reticulum Ca(2+) contents in PLM KO myocytes overexpressing the S68A mutant were similar to PLM KO myocytes overexpressing GFP. We conclude that at the single-myocyte level, PLM affects cardiac contractility and [Ca(2+)](i) homeostasis primarily by its direct

  19. Hidroginástica na terceira idade

    Directory of Open Access Journals (Sweden)

    Karla Campos de Paula

    1998-02-01

    Full Text Available O processo de envelhecimento no indivíduo saudável está relacionado com inúmeras alterações psicológicas e físicas que interferem na área motora, concorrendo para a inatividade e contribuindo para o aparecimento e agravamento de determinadas doenças, além de influenciar negativamente a realização das atividades de vida diária. Portanto, a prática de atividade física é fundamental para o idoso, não só na prevenção de doenças como na reabilitação de suas habilidades motoras, promovendo um estilo de vida saudável que é fator preponderante para a melhoria da qualidade de vida. Contudo, algumas precauções devem ser adotadas na prescrição da atividade direcionada para o idoso, a fim de que esta seja segura e prazerosa. Dentre os exercícios mais adequados aos idosos estão a caminhada, o ciclismo, a natação e a hidroginástica. Devido a sua grande procura, a hidroginástica vem aumentando o número de adeptos na terceira idade. Ela propicia ao idoso o aumento de sua capacidade aeróbia, força muscular, flexibilidade articular e o treinamento de habilidades específicas como equilíbrio e coordenação motora. Soma-se ainda o fato de esta atividade oferecer ambiente de relaxamento e incentivo ao contato social, atuando no combate ao estresse, depressão, na melhoria da autopercepção corporal e da auto-estima. Devemos, então, estar atentos às particularidades da hidroginástica, a fim de aproveitar todas as vantagens que esta oferece para o programa de exercícios direcionado para a terceira idade.

  20. Transport of Na48 Drift Chambers to Dubna

    CERN Multimedia

    GOLOVATYUK, V

    2010-01-01

    On 22 July, in the occasion of the departure of the Na48 Drift Chambers from CERN, Mikhail Itkis (acting Director of the JIINR) and Rolf Heuer (CERN Director General) visited the NA62 experimental area.

  1. Mechanisms and regulation of Na(+) uptake by freshwater fish.

    Science.gov (United States)

    Kumai, Yusuke; Perry, Steve F

    2012-12-01

    Mechanisms of ion uptake by freshwater (FW) fish have received considerable attention over the past 80 years. Through an assortment of techniques incorporating whole animal physiology, electrophysiology and molecular biological approaches, three models have been proposed to account for Na(+) uptake. (1) Direct exchange of Na(+) and H(+) via one or more types of Na(+)/H(+) exchanger (slc9), (2) uptake of Na(+) through epithelial Na(+) channels energized by an electrical gradient created by H(+)-ATPase and (3) Na(+)/Cl(-) co-transport (slc12). While each mechanism is supported at least in part by theoretical or experimental data, there are several outstanding questions that have not yet been fully resolved. Furthermore, there are few details concerning how these Na(+) uptake mechanisms are fine tuned in response to the fluctuating FW environments. In this review, we summarize the current understanding of these three Na(+) uptake mechanisms and discuss their regulation by endocrine (cortisol and prolactin) and neurohumoral (catecholamines) factors.

  2. Fundamental symmetries in {sup 21}Na decay

    Energy Technology Data Exchange (ETDEWEB)

    Hoek, D.J. van der; Hoekstra, R.; Jungmann, K.; Kruithof, W.L.; Onderwater, C.J.G.; Sohani, M.; Willmann, L.; Wilschut, H.W. [KVI, University of Groningen, Groningen (Netherlands)

    2009-07-01

    The {beta}-{nu} correlations in {beta}-decay allows searching for contributions that go beyond the V-A description of the Standard Model for the electroweak interaction. We are developing an experimental setup to measure correlations in the {beta}-decay of {sup 21}Na. By trapping the radioactive atoms, the recoiling nucleus (kinetic energy <230 eV) can be measured in a reaction microscope in coincidence with the emitted {beta} particle. The first step is to study {beta}-{nu} correlations that allows to set limits on scalar and tensor contributions. By polarizing the parent nucleus it becomes possible to search for time reversal violation. The production and trapping of {sup 21}Na has been accomplished. Details of the setup with a two laser system and the status of this phase of the program are described.

  3. Kaizen: Uma Metodologia Inovadora na Siderurgia

    Directory of Open Access Journals (Sweden)

    Hericson Estanislau Prata

    2017-04-01

    Full Text Available A racionalização do processo produtivo industrial, por meio da redução dos desperdícios e da modernização do processo produtivo, com a adoção do Sistema Toyota de Produção (Produção Enxuta, tem sido adotada por uma parte importante das indústrias no mundo. O objetivo deste artigo é descrever essa metodologia empregada pelo grupo de melhoria de fase intensiva adotado na Vallourec Tubos do Brasil S.A. Como resultado, verificou-se que o processo utilizado para a implantação de mudanças em curto prazo foi a semana intensiva, também conhecida como evento Kaizen na indústria automotiva.

  4. NA62 experiment at CERN SPS

    Directory of Open Access Journals (Sweden)

    Kozhuharov Venelin

    2014-01-01

    Full Text Available The NA62 experiment at SPS is a continuation of the long standing CERN kaon physics program. The high statistics and the unprecedent precision allow to probe the Standard Model and test the description of the strong interactions at low energy. The final results on the the lepton universality test by measuring the ratio RK = Γ(K+ → e+ν/Γ(K+ → µ+ν and the study of the K± → π±γγ decay are presented. The major goal of the NA62 experiment is to perform a measurement of the Br(K+ → π+νν̄ with a precision of 10% in two years of data taking. The detector setup together with the analysis technique is described.

  5. Fotografia na rynku aukcyjnym w Polsce

    Directory of Open Access Journals (Sweden)

    Bednarek, Anna

    2012-09-01

    Full Text Available W artykule podjęta została analiza stanu aukcyjnego rynku fotografii w Polsce w oparciu o wyniki sprzedaży z okresu od pierwszej aukcji fotografii (1996 do końca 2011 roku. Dane te pozwalają czytelnikowi na zapoznanie się z rozmiarami tego rynku (obrót, liczba sprzedanych obiektów, charakterystyką nabywanych obiektów (rekordy cenowe, średnie ceny, popularni twórcy i okresy oraz z trudnościami, które można napotkać podczas badania tego zjawiska. W podsumowaniu znalazły się przewidywania dotyczące dalszego rozwoju rynku.

  6. Recent results from NA61/SHINE

    CERN Document Server

    Andronov, Evgeny

    2016-01-01

    The NA61/SHINE experiment aims to discover the critical point of strongly interacting matter and study the properties of the onset of deconfinement. For these goals a scan of the two dimensional phase diagram (T-$\\mu_B$) is being performed at the SPS by measurements of hadron production in proton-proton, proton-nucleus and nucleus-nucleus interactions as a function of collision energy and system size. In this contribution intriguing results on the energy dependence of hadron spectra and yields in inelastic p+p and centrality selected Be+Be collisions will be presented. In particular, the energy dependence of the signals of deconfinement, the 'horn', 'step' and 'kink', in p+p interactions will be presented and compared with the corresponding results from central Pb+Pb collisions from NA49.

  7. HUME E O EMPIRISMO NA MORAL

    Directory of Open Access Journals (Sweden)

    Adriano Naves de Brito

    2007-12-01

    Full Text Available O que pretendo defender neste texto é que uma posição empirista na moral é compatível com uma pretensão de validade intersubjetiva de juízos morais. Essa pretensão deve, nesse caso, estar calcada na naturalização dos fundamentos da moralidade, mas tem de conviver com limites acerca da justificação de enunciados de valor. Para defender esse ponto, sirvo-me da filosofia moral de Hume, como ele a expôs no seu texto Uma investigação sobre os princípios da moral. No que diz respeito à filosofia de Hume, o objetivo deste texto é explicitar o caráter empírico seja de seu método de investigação da moral, seja do princípio que para ela ele encontra.

  8. The NA60 experiment readout architecture

    CERN Document Server

    Floris, M; Usai, G L; David, A; Rosinsky, P; Ohnishi, H

    2004-01-01

    The NA60 experiment was designed to identify signatures of a new state of matter, the Quark Gluon Plasma, in heavy-ion collisions at the CERN Super Proton Synchroton. The apparatus is composed of four main detectors: a muon spectrometer (MS), a zero degree calorimeter (ZDC), a silicon vertex telescope (VT), and a silicon microstrip beam tracker (BT). The readout of the whole experiment is based on a PCI architecture. The basic unit is a general purpose PCI card, interfaced to the different subdetectors via custom mezzanine cards. This allowed us to successfully implement several completely different readout protocols (from the VME like protocol of the MS to the custom protocol of the pixel telescope). The system was fully tested with proton and ion beams, and several million events were collected in 2002 and 2003. This paper presents the readout architecture of NA60, with particular emphasis on the PCI layer common to all the subdetectors. (16 refs).

  9. O Personal Trainer na Perspectiva do Marketing

    Directory of Open Access Journals (Sweden)

    Cibele Biehl Bossle

    2011-03-01

    Full Text Available Esse estudo apresenta mapeamento das referências dedicadas à formação do personal trainer em bases de dados eletrônicas. Essa garimpagem revelou baixa produção científica sobre o assunto e mostrou que na literatura sobre personal trainer predominam livros com linguagem corrente no mundo dos negócios. Esses achados nos levaram a indagar sobre a força do discurso físico-empresarial, especialmente o marketing, na constituição desta ocupação profissional. Jeremy Rifkin, Zygmunt Bauman, Paula Sibilia e Denise Sant'Anna permitiram visualizar que o marketing dirigido ao personal trainer tem como tarefa reinventar, ressignificar e "repaginar" esta modalidade de serviço em nome da sobrevivência no disputado mercado da vida ativa.

  10. Luzes portuguesas na caverna do patriarcado brasileiro

    Directory of Open Access Journals (Sweden)

    Constância Lima Duarte

    2013-09-01

    Full Text Available Novas cartas portuguesas revelou literariamente as diversas formas de opressão a que as mulheres estavam submetidas através dos séculos, pela distorcida mística imposta pelo patriarcalismo – verdadeira caverna que cerceava o pensamento das mulheres e seu lugar na sociedade. A publicação do livro das três marias contribuiu para a formação de um senso crítico, ampliou a consciência feminista, e propiciou o surgimento de uma literatura engajada também entre nós. O texto pretende refletir sobre a repercussão da publicação da obra na mídia impressa e entre as feministas brasileiras.

  11. The two C-terminal tyrosines stabilize occluded Na/K pump conformations containing Na or K ions.

    Science.gov (United States)

    Vedovato, Natascia; Gadsby, David C

    2010-07-01

    Interactions of the three transported Na ions with the Na/K pump remain incompletely understood. Na/K pump crystal structures show that the extended C terminus of the Na,K-adenosine triphosphatase (ATPase) alpha subunit directly contacts transmembrane helices. Deletion of the last five residues (KETYY in almost all Na/K pumps) markedly lowered the apparent affinity for Na activation of pump phosphorylation from ATP, a reflection of cytoplasmic Na affinity for forming the occluded E1P(Na3) conformation. ATPase assays further suggested that C-terminal truncations also interfere with low affinity Na interactions, which are attributable to extracellular effects. Because extracellular Na ions traverse part of the membrane's electric field to reach their binding sites in the Na/K pump, their movements generate currents that can be monitored with high resolution. We report here electrical measurements to examine how Na/K pump interactions with extracellular Na ions are influenced by C-terminal truncations. We deleted the last two (YY) or five (KESYY) residues in Xenopus laevis alpha1 Na/K pumps made ouabain resistant by either of two kinds of point mutations and measured their currents as 10-mM ouabain-sensitive currents in Xenopus oocytes after silencing endogenous Xenopus Na/K pumps with 1 microM ouabain. We found the low affinity inhibitory influence of extracellular Na on outward Na/K pump current at negative voltages to be impaired in all of the C-terminally truncated pumps. Correspondingly, voltage jump-induced transient charge movements that reflect pump interactions with extracellular Na ions were strongly shifted to more negative potentials; this signals a several-fold reduction of the apparent affinity for extracellular Na in the truncated pumps. Parallel lowering of Na affinity on both sides of the membrane argues that the C-terminal contacts provide important stabilization of the occluded E1P(Na3) conformation, regardless of the route of Na ion entry into the

  12. The temperature dependence of the cross section for the energy pooling process Na(3P)+Na(3P) to Na(4D)+Na(3S)

    Science.gov (United States)

    Horvatic, V.; Movre, M.; Vadla, C.

    1999-10-01

    We report the measurements of the temperature dependence of the cross section σ4D for the energy pooling process Na(3P)+Na(3P) to Na(4D)+Na(3S). The latest two, as yet undisputed, results for σ4D obtained by different authors at T = 597 K and T = 483 K suggest that this cross section decreases with increasing T, which contradicts the theory and other experiments on similar processes. To resolve this controversy and to examine the temperature trend of the cross section, we have measured the σ4D in the temperature range 567-705 K, covering the high-temperature region that has not yet been investigated experimentally. To determine σ4D we have excited sodium atoms in the quasistatic wing of the D1 line using a cw dye laser and measured the fluorescence intensity for the 4D to 3P3/2 transition, relative to the intensity of the optically thin quasistatic wing of the D2 line. The spatial distribution of the number density of the sodium atoms in the 3P3/2 state and the sodium ground-state number density were measured too. The method used for the determination of the cross section is advantageous since it entirely circumvents the need to account for the radiation trapping of 3P level radiation, which was substantial under experimental conditions of the ground-state densities being 1014-1016 cm-3. The measurements of the cross section σ4D in the investigated temperature range have shown that it increases as ~exp(-Δ E/kT). From the experiment we obtained Δ E = (608±95) cm-1, which is in excellent agreement with the energy defect (613 cm-1) for the considered process, and in fair agreement with the values which follow from recent theoretical calculations.

  13. NA35: sulphur-gold collision

    CERN Multimedia

    1991-01-01

    In this image the real particles produced by the collision of a 6400 GeV sulphur ion with a gold target can be seen as they pass through a streamer chamber. Streamer chambers consist of a gas chamber through which a strong pulsed electric field is passed, creating sparks as a charged particle passes through it. The NA35 experiment, which was in operation in the 1980s, was part of CERN's ongoing heavy ion project.

  14. Acetylene diffusion in Na-Y zeolite

    Indian Academy of Sciences (India)

    S Mitra; S Sumitra; A M Umarji; R Mukhopadhyay; S Yashonath; S L Chaplot

    2004-08-01

    Study of diffusivity of acetylene adsorbed in Na-Y zeolite by quasi-elastic neutron scattering (QENS) measurements at temperatures of 300, 325 and 350 K is reported. A model in which the acetylene molecules undergo random-walk diffusion characterized by a Gaussian distribution of jump lengths inside zeolite cages describes the data consistently. The diffusion constant, residence time between jumps and root mean square jump length are determined.

  15. Prototype calorimeters for the NA3 experiment

    CERN Multimedia

    1975-01-01

    The NA3 Experiment was set-up on the North Area of the SPS by the CERN/ Ecole Polytechnique/College de France/ Orsay/Saclay Collaboration, to study high transverse momentum leptons and hadrons from hadron collisions. The calorimeters measured the energy of hadrons (prototype on the right) and leptons (prototype on the left). They used a new type of plastic scintillator (plexipop). (see CERN Courier of November 1975) energy (prototype on the right)

  16. Clubes carnavalescos negros na cidade de Pelotas

    Directory of Open Access Journals (Sweden)

    Loner, Beatriz Ana

    2009-01-01

    Full Text Available O artigo trata da organização negra na cidade de Pelotas, particularmente com relação aos seus clubes carnavalescos, que tiveram seu auge entre os anos de 1920 e 1950. Pretende-se descrever os principais clubes e sua evolução, analisando seu papel e sua importância para a comunidade negra pelotense

  17. SPLETNA TRGOVINA NA PRIMERU PORTALA EBAY

    OpenAIRE

    Babić, Aleksandra

    2012-01-01

    Prilagajanje spremembam v poslovnem okolju je temeljnega pomena za obstoj slehernega podjetja. Sodobno trženje postaja temeljna filozofija vseh sodobnih, tržno usmerjenih podjetij. Z elektronskim poslovanjem so podjetja s pomočjo računalnikov in informatizacije procesov posodobila del ali celotno poslovanje, kot na primer komunikacijo z dobavitelji in odjemalci, skladiščenje, distribucijo, trženje, prodajo in podobno. Vendar je elektronska trgovina le del elektronskega poslovanja podjetja. ...

  18. Posso ser eu mesmo na escola?

    Directory of Open Access Journals (Sweden)

    Wilton Orlando Trapp

    2012-04-01

    Full Text Available Este texto faz uma reflexão acerca da importância de se pensar a escola como um lugar da convivência humana e do respeito à cultura do brincar/jogar, trazendo contribuições à superação da influência mercadológica presente nas práticas de movimento e na forma de planejar o uso do espaço escolar.

  19. UPORABA KODE QR NA MOBILNIH NAPRAVAH

    OpenAIRE

    Taciga, Matej

    2013-01-01

    V diplomski nalogi je opisan je razvoj aplikacije za mobilno napravo na platformi Windows Phone, ki omogoča branje QR kode. Aplikacijo smo razvili v programskem jeziku C#. Zajete in opisane so možnosti uporabe QR kode. Opisano je testiranje obstoječih aplikacij s QR čitalci. Predstavljena sta tudi razvoj in struktura QR kode. S primerom je razloženo kako so podatki zakodirani v kodo.

  20. The NA62 experiment at CERN

    Science.gov (United States)

    Venditti, Stefano

    2016-12-01

    The goal of the NA62 experiment at CERN is to collect O(100) events of the ultrarare K+→ π +ν bar {ν } decay in two years. After a long R&D phase and a successful pilot run in 2014, the first data-taking phase took place in 2015. In this paper the importance of the experiment's physics goal, as well as the experimental solutions adopted in order to attain it, will be reviewed.

  1. Cultura Política na Antiguidade

    Directory of Open Access Journals (Sweden)

    José Petrúcio Farias Júnior

    2009-06-01

    Full Text Available

    Pretendemos discutir nesse artigo algumas implicações do termo cultura política na Antiguidade, especificamente, na sociedade romana imperial. Dessa forma, acreditamos que as considerações que apresentaremos a seguir contribuam para reflexão da utilização desse termo, produto das investigações contemporâneas, sobre os estudos das sociedades antigas. Para a historiadora Profa. Dra. Margarida Maria de Carvalho, tais reflexões representam ainda uma lacuna na historiografia concernente a essa temática. Isso posto, discorreremos, inicialmente, sobre o conceito de cultura e seus desdobramentos para, em seguida, refletirmos sobre o viés interpretativo que fundamenta estudos históricos que se desenvolvem sob o beneplácito da linha de pesquisa intitulada História e Cultura Política.

  2. Hadron production measurement from NA61/SHINE

    CERN Document Server

    Korzenev, A

    2013-01-01

    New results from the NA61/SHINE experiment on the determination of charged hadron yields in proton-carbon interactions are presented. They aim to improve predictions of the neutrino flux in the T2K experiment. The analysis is based on the main dataset collected by NA61/SHINE in the year 2009. The data were recorded using a secondary-proton beam of 31 GeV/$c$ momentum from CERN SPS which impinges on a graphite target. To determine the inclusive production cross section for charged pions, kaons and protons a thin target was exploited. Results of this measurement are used in the T2K beam simulation program to reweight hadron yields at the interaction vertex. At the same time, NA61/SHINE results obtained with the T2K replica target allow to constrain hadron yields at the surface of the target. This allows to constrain up to 90% of the neutrino flux, thus reducing significantly the model dependence of the neutrino beam prediction. All measured spectra are compared to predictions of hadron production models.

  3. Transplante pulmonar na infância

    Directory of Open Access Journals (Sweden)

    Camargo José J.

    2002-01-01

    Full Text Available Objetivos: este artigo faz uma revisão dos principais aspectos relacionados com o transplante pulmonar na população pediátrica, e traz a experiência da equipe pioneira na realização do procedimento na América Latina. Fontes de dados: foram utilizadas informações através de revisão bibliográfica, realizada por busca direta de artigos científicos e por pesquisa nas bases de dados Medline e Lilacs. Síntese dos dados: o artigo é estruturado em tópicos, nos quais procura identificar as semelhanças e as diferenças com o transplante pulmonar do adulto. Discute os problemas específicos da criança transplantada e enfatiza uma situação específica, a do transplante pulmonar com doadores vivos aparentados. Conclusões: os avanços observados no transplante pulmonar realizado em adultos, para tratamento de doenças pulmonares, parenquimatosas ou vasculares, têm sido transferidos, nos últimos anos, para a população pediátrica, com sucesso crescente.

  4. Imunossupressores na Dermatologia Immunosuppressive agents in Dermatology

    Directory of Open Access Journals (Sweden)

    Aline Lopes Bressan

    2010-02-01

    Full Text Available Os imunossupressores são drogas que agem na divisão celular e têm propriedades anti-inflamatórias. Sendo assim, são essencialmente prescritos na prevenção de rejeição de transplantes e no tratamento das doenças autoimunes e inflamatórias crônicas, que, na Dermatologia, têm a psoríase como maior representante. Nesta sessão serão descritas as principais drogas imunossupressoras, com orientações para seu manejo adequado.Immunosupressants are drugs that act in cell division and have anti-inflammatory effects. Therefore, they are essentially prescribed in the prevention of transplant rejection and in the treatment of autoimmune disorders and chronic inflammatory diseases, whose main example in Dermatology is psoriasis. In this work the most important immunosuppressive drugs and orientation to properly administer them are going to be described.

  5. Envolvimento do sistema nervoso central na cisticercose

    Directory of Open Access Journals (Sweden)

    Aristides Cheto de Queiroz

    1979-03-01

    Full Text Available No estudo do envolvimento do SNC na cisticercose, verificou-se uma freqüência de 0,3%, sempre como achado incidental no estudo de rotina de autópsias; apenas um caso mostrou boa correlação com a presença de manifestações neurológicas. Esta freqüência que é baixa em relação ao que é observado em outras regiões do Brasil, mostra que a neurocisticercose não representa um grande problema na região. As reações do hospedeiro ao embrião do cisticerco foram sempre do tipo inflamatório crônico e fibrosante. Neste estudo ficou demonstrada a importância do método de impregnação pela prata (Grocott na identificação do esqueleto do cisticerco no interior de lesões fibrosantes e/ou calcificadas.

  6. Resonances production from the NA60 experiment

    Directory of Open Access Journals (Sweden)

    De Falco A.

    2012-11-01

    Full Text Available The NA60 experiment at the CERN SPS has studied light vector meson production in In-In collisions at 158A GeV. The ϕ meson was detected via both the K+K− and the μ+μ− decay channels. The yields and inverse slope parameters of the mT spectra observed in the two channels are compatible within errors, different from the large discrepancies seen in Pb-Pb collisions between the hadronic (NA49 and dimuon (NA50 decay channels. In the invariant mass region 0.2 1 GeV, the excess is found to be prompt, with remarkable differences with respect to the Drell-Yan process. The Teff slope parameter, extracted from the transverse mass spectra, shows a rise with mass up to the ρ, followed by a sudden decline for higher masses. The former is consistent with radial flow of a hadronic source, while the latter suggests a dominantly partonic emission source.

  7. Report from the NA61/SHINE experiment

    CERN Document Server

    Aduszkiewicz, A

    2015-01-01

    This document reports on the status and plans of the NA61/SHINE experiment at the CERN SPS as of October 2015. First, an overview of the 2014 and 2015 data-taking period on p+Pb interactions at 158 GeV/c and Ar+Sc collisions at 13A GeV/c - 150A GeV/c is given. The latter data-taking with the first primary Ar beams at CERN was a major success. Second, the facility maintenance and upgrades are briefly presented. The VTX-1 magnet was damaged at the beginning of the 2015 proton period. The physics data-taking for p+p interactions at 400 GeV/c and for the Fermilab neutrino beams as well as the pilot data taking on Pb+Pb collisions at 30A GeV/c was replaced by detector tests and calibration runs. Third, the advance in the NA61/SHINE software and calibration procedures is briefly reported. Fourth, new physics results are presented. In particular, the very first results on Ar+Sc collisions are presented. Fifth, plans for data taking in 2016 - 2018 are outlined and ideas concerning the NA61/SHINE physics programme...

  8. Afasia adquirida na infância

    Directory of Open Access Journals (Sweden)

    Eliana C. Wanderley

    1969-06-01

    Full Text Available São relatados dois casos de afasia em menina de 10 anos e menino de 8 anos, conseqüentes a lesão cerebral por projétil de arma de fogo no primeiro caso e septicemia com tromboflebite no segundo. Nos dois casos a evolução foi bastante favorável e ambos os pacientes apresentaram percepção praticamente normal com distúrbios na expressão oral que assumia várias vezes o tipo de lapso amnéstico. A expressão gráfica nos dois casos foi mais atingida como sonseqüência de estar menos automatizada. O fenômeno da perseveração foi notado na fala no primeiro caso e, na escrita, no seguno. Foi discutida a justificativa do diagnóstico e lembrado o diagnóstico diferencial com outros distúrbios da fala em crianças.

  9. Regulation of paracellular Na+ and Cl(-) conductances by hydrostatic pressure.

    Science.gov (United States)

    Tokuda, Shinsaku; Niisato, Naomi; Nagai, Toshiki; Taruno, Akiyuki; Nakajima, Ken-Ichi; Miyazaki, Hiroaki; Yamada, Toshiki; Hosogi, Shigekuni; Ohta, Mariko; Nishio, Kyosuke; Iwasaki, Yoshinobu; Marunaka, Yoshinori

    2009-09-01

    The effect of hydrostatic pressure on the paracellular ion conductance (Gp) composed of the Na(+) conductance (G(Na)) and the Cl(-) conductance (G(Cl)) has been Investigated. Gp, G(Na) and G(Cl) were time-dependently increased after applying an osmotic gradient generated by NaCl with basolateral hypotonicity. Hydrostatic pressure (1-4cm H2O) applied from the basolateral side enhanced the osmotic gradient-induced increase in Gp, G(Na) and G(Cl) in a magnitude-dependent manner, while the hydrostatic pressure applied from the apical side diminished the osmotic gradient-induced increase in Gp, G(Na) and G(Cl). How the hydrostatic pressure influences Gp, G(Na) and G(Cl) under an isosmotic condition was also investigated. Gp, G(Na) and G(Cl) were stably constant under a condition with basolateral application of sucrose canceling the NaCl-generated osmotic gradient (an isotonic condition). Even under this stable condition, the basolaterally applied hydrostatic pressure drastically elevated Gp, G(Na) and G(Cl), while apically applied hydrostatic pressure had little effect on Gp, G(Na) or G(Cl). Taken together, these observations suggest that certain factors controlled by the basolateral osmolality and the basolaterally applied hydrostatic pressure mainly regulate the Gp, G(Na) and G(Cl).

  10. Spontaneous NA+ transients in individual mitochondria of intact astrocytes.

    Science.gov (United States)

    Azarias, Guillaume; Van de Ville, Dimitri; Unser, Michael; Chatton, Jean-Yves

    2008-02-01

    Mitochondria in intact cells maintain low Na(+) levels despite the large electrochemical gradient favoring cation influx into the matrix. In addition, they display individual spontaneous transient depolarizations. The authors report here that individual mitochondria in living astrocytes exhibit spontaneous increases in their Na(+) concentration (Na(mit)(+) spiking), as measured using the mitochondrial probe CoroNa Red. In a field of view with approximately 30 astrocytes, up to 1,400 transients per minute were typically detected under resting conditions. Na(mit)(+) spiking was also observed in neurons, but was scarce in two nonneural cell types tested. Astrocytic Na(mit)(+) spikes averaged 12.2 +/- 0.8 s in duration and 35.5 +/- 3.2 mM in amplitude and coincided with brief mitochondrial depolarizations; they were impaired by mitochondrial depolarization and ruthenium red pointing to the involvement of a cation uniporter. Na(mit)(+) spiking activity was significantly inhibited by mitochondrial Na(+)/H(+) exchanger inhibition and sensitive to cellular pH and Na(+) concentration. Ca(2+) played a permissive role on Na(mit)(+) spiking activity. Finally, the authors present evidence suggesting that Na(mit)(+) spiking frequency was correlated with cellular ATP levels. This study shows that, under physiological conditions, individual mitochondria in living astrocytes exhibit fast Na(+) exchange across their inner membrane, which reveals a new form of highly dynamic and localized functional regulation.

  11. Explosive phenomena in heavily irradiated NaCl

    NARCIS (Netherlands)

    denHartog, HW; Vainshtein, DI; Matthews, GE; Williams, RT

    1997-01-01

    In heavily irradiated NaCl crystals explosive phenomena can be initiated during irradiation or afterwards when samples are heated to temperatures between 100 and 250 degrees C. During irradiation of NaCl Na and Cl-2 precipitates and void structures are produced along with the accumulation of stored

  12. Stress of Cl- is Stronger than That of Na+ on Glycine max Seedlings Under NaCl Stress

    Institute of Scientific and Technical Information of China (English)

    LUO Qing-yun; YU Bing-jun; LIU You-liang

    2002-01-01

    Seedlings of six Glycine max cultivars were used to compare Cl- with Na+ in stress effects onsoybean seedlings under NaCl stress. Results showed that stress of NaCl on G. max seedlings was mainlycaused by Cl- and not by Na+. After treatment with isoosmotic solutions of Cl- (without Na+ ) and Na+ (with-out Cl-) respectively, fresh weight and height of G. max seedlings growing in solution of Cl- were much morestressed than those in solution of Na+. And the roots and leaves electrolyte leakage were much more increasedunder stress of Cl- than those under stress of Na+. Salt tolerance of G. max seedlings was mainly contributedto Cl- withheld in roots of seedlings to decrease its content in leaves.

  13. VISIBILIDADE GAY NA ESCOLA: ESTUDANTES QUEER

    Directory of Open Access Journals (Sweden)

    Aline Ferraz da Silva

    2008-03-01

    Full Text Available Nesse artigo apresento as considerações e análises presentes na pesquisa em processo, que realizo numa escola pública. Sua constituição deve seu primeiro movimento às manifestações de desconforto e homofobia com relação a um grupo específico de três estudantes gays na comunidade escolar na qual atuo como professora. Percebo que a presença desse grupo desacomoda o cotidiano escolar e desenvolvo minha argumentação com base no potencial desestabilizador desses sujeitos, na intenção de pensar o impensável no currículo escolar. Esse trabalho parte da visibilidade de uma identidade sexual que foge à norma heterossexual e desafia a tendência normalizadora e homogeneizadora da educação. A maneira como esse grupo gay se posiciona e constrói seus corpos cruza as fronteiras do masculino/feminino, desnaturalizando as identidades sexuais e de gênero que se baseiam em características biológicas e se apresentando como diferença que escapa às classificações binárias. Na construção da pesquisa utilizo como referência o pensamento de Michel Foucault, especialmente com relação à construção histórica e discursiva de conceitos como sexualidade, identidade, diferença e normalidade que têm servido para criação e manutenção de padrões de conduta. Ao levar a problematização desses conceitos para o contexto escolar, considero produtiva a teorização queer para pensar a possibilidade de uma educação não heteronormativa, produtora de diferenças, que desconstrua identidades ao invés de tentar cristalizá-las.

  14. Reflectivity of NaK Droplets

    Science.gov (United States)

    Wiedemann, C.; Oswald, M.; Stabroth, S.; Klinkrad, H.; Vörsmann, P.

    An important contribution to the space debris population near 900 km orbital altitude are the NaK droplets. Sixteen nuclear powered satellites of the type RORSAT launched between 1980 and 1988 activated a reactor core ejection system close to this altitude. The core ejection causes an opening of the primary coolant circuit. The liquid coolant has been released into space during these core ejections, forming droplets up to a diameter of 5.5 cm. These droplets consist of an alloy of two alkali metals, sodium and potassium (NaK). In this paper the monochromatic and the total reflectivity of NaK is calculated using theoretical models. The reflectivity depends on the alloy composition and temperature of a droplet. The alloy composition may change due to evaporation, resulting in an enrichment of sodium especially at the droplet surface. According to the literature, there is only a limited number of available measurement data concerning the optical properties of NaK alloys. Furthermore the published data for pure sodium and potassium are controversial. Thus it is necessary to investigate the optical properties of alkali metals and their alloys. Mainly two types of optical absorption, the intraband and the interband absorption, are considered. The intraband absorption is calculated using the Drude-model which uses electrical properties to derive the optical constants of pure metals or alloys. Drude assumes that the valence electrons can be treated as free electrons. The electrons behave like an ideal gas of uncharged particles. The theory of free electrons is a very simple model for the description of the valence electrons in metals. This assumption is sufficient for alkali metals, because they show a nearly free electron behavior. For the interband absorption the classical Butcher-model is used. Furthermore an absorption anomaly which has been observed in some alkali metals is discussed. Especially for potassium, some measurements revealed an unexpected absorption in the

  15. Route, mechanism, and implications of proton import during Na+/K+ exchange by native Na+/K+-ATPase pumps.

    Science.gov (United States)

    Vedovato, Natascia; Gadsby, David C

    2014-04-01

    A single Na(+)/K(+)-ATPase pumps three Na(+) outwards and two K(+) inwards by alternately exposing ion-binding sites to opposite sides of the membrane in a conformational sequence coupled to pump autophosphorylation from ATP and auto-dephosphorylation. The larger flow of Na(+) than K(+) generates outward current across the cell membrane. Less well understood is the ability of Na(+)/K(+) pumps to generate an inward current of protons. Originally noted in pumps deprived of external K(+) and Na(+) ions, as inward current at negative membrane potentials that becomes amplified when external pH is lowered, this proton current is generally viewed as an artifact of those unnatural conditions. We demonstrate here that this inward current also flows at physiological K(+) and Na(+) concentrations. We show that protons exploit ready reversibility of conformational changes associated with extracellular Na(+) release from phosphorylated Na(+)/K(+) pumps. Reversal of a subset of these transitions allows an extracellular proton to bind an acidic side chain and to be subsequently released to the cytoplasm. This back-step of phosphorylated Na(+)/K(+) pumps that enables proton import is not required for completion of the 3 Na(+)/2 K(+) transport cycle. However, the back-step occurs readily during Na(+)/K(+) transport when external K(+) ion binding and occlusion are delayed, and it occurs more frequently when lowered extracellular pH raises the probability of protonation of the externally accessible carboxylate side chain. The proton route passes through the Na(+)-selective binding site III and is distinct from the principal pathway traversed by the majority of transported Na(+) and K(+) ions that passes through binding site II. The inferred occurrence of Na(+)/K(+) exchange and H(+) import during the same conformational cycle of a single molecule identifies the Na(+)/K(+) pump as a hybrid transporter. Whether Na(+)/K(+) pump-mediated proton inflow may have any physiological or

  16. The relation between aging, aortic NaF avidity and coronary artery NaF avidity: A NaF PET CT study

    DEFF Research Database (Denmark)

    Blomberg, Björn; Thomassen, Anders; Hildebrandt, Malene;

    2013-01-01

    volunteers without traditional cardiovascular risk factors were prospectively assessed by Sodium 18-Fluoride (Na-18F) PET CT imaging. Global aortic uptake of Na-18F was determined by calculating the average aortic blood pool subtracted maximum standardized uptake value (cSUV) [maximum SUVaorta - mean...... SUVblood pool]. Global uptake of Na-18F in the coronary arteries was determined by calculating the average heart blood pool subtracted maximum SUV [maximum SUVheart - mean SUVblood pool]. Calculating regression and correlation coefficients summarized the data. Results: A strong linear relationship...... was observed between aortic and coronary artery Na-18F avidity (Pearson’s r = 0.83 [95% CI; 0.49, 0.95]; t statistic = 4.71; P = 0.0008). A quadratic relationship was observed between aging and aortic Na-18F avidity. Also, a quadratic relationship was observed between aging and coronary artery Na-18F uptake...

  17. Na+ channel function, regulation, structure, trafficking and sequestration

    Science.gov (United States)

    Chen-Izu, Ye; Shaw, Robin M; Pitt, Geoffrey S; Yarov-Yarovoy, Vladimir; Sack, Jon T; Abriel, Hugues; Aldrich, Richard W; Belardinelli, Luiz; Cannell, Mark B; Catterall, William A; Chazin, Walter J; Chiamvimonvat, Nipavan; Deschenes, Isabelle; Grandi, Eleonora; Hund, Thomas J; Izu, Leighton T; Maier, Lars S; Maltsev, Victor A; Marionneau, Celine; Mohler, Peter J; Rajamani, Sridharan; Rasmusson, Randall L; Sobie, Eric A; Clancy, Colleen E; Bers, Donald M

    2015-01-01

    This paper is the second of a series of three reviews published in this issue resulting from the University of California Davis Cardiovascular Symposium 2014: Systems approach to understanding cardiac excitation–contraction coupling and arrhythmias: Na+ channel and Na+ transport. The goal of the symposium was to bring together experts in the field to discuss points of consensus and controversy on the topic of sodium in the heart. The present review focuses on Na+ channel function and regulation, Na+ channel structure and function, and Na+ channel trafficking, sequestration and complexing. PMID:25772290

  18. Effect of Na+ on surface fractal dimension of compacted bentonite

    Science.gov (United States)

    Xiang, G. S.; Xu, Y. F.; Jiang, H.

    2015-05-01

    Compacted Tsukinuno bentonite was immersed into NaCl solutions of different concentrations in oedometers, and the surface fractal dimension of bentonite-saline association was measured by nitrogen adsorption isotherms. The application of the Frenkel-Halsey-Hill equation and the Neimark thermodynamic method to nitrogen adsorption isotherms indicated that the surface roughness was greater for the bentonite-saline association. The surface fractal dimension of bentonite increased in the NaCl solution with low Na+ concentration, but decreased at high Na+ concentration. This process was accompanied by the same tendency in specific surface area and microporosity with the presence of Na+ coating in the clay particles.

  19. VPLIV NADZORA ZAPOSLENIH NA NJIHOVO VEDENJE IN MOTIVACIJO PRI DELU

    OpenAIRE

    Marinšek, Teja

    2011-01-01

    Nadzor na delovnem mestu je sodoben problem, v katerem smo udeleženi vsi. Z vedno manjšim zaupanjem med nadrejenimi in podrejenimi se nadzor poostruje in s tem se tudi pritiski na delovnem mestu povečujejo. V diplomskem delu smo raziskovali predvsem vpliv nadzora na vedenje človeka. Zanimalo nas je, kako tak pritisk vpliva na človeka in njegove spremembe v obnašanju. Ali nanj to vpliva pozitivno in motivacijsko ali deluje na človeka negativno. Obravnavali smo tudi zakone, ki opredeljujejo...

  20. NA48 experiment : view along the NA48 beamline with the detector in the distance.

    CERN Multimedia

    Hans Taureg

    1996-01-01

    Photo 02: Side view of the NA48 experiment showing the LKR calorimeter cryostat No one is sure why the Universe wound up the way it has: all matter and no antimatter. According to prevailing theories, the early universe had equal amounts of matter and antimatter. To see what might be missing from the theories, physicists search for the rare cases in which matter and antimatter behave differently. One such imbalance, called direct CP violation, showed up in the NA 31 experiment at CERN. The results from this experiment, first presented in 1993, showed that when K mesons and their antimatter cousins decay, they show a slight preference for matter over antimatter. Later experiments with neutral K mesons, including NA48 at CERN and KTeV at Fermilab in the United States, showed direct CP violation is real.

  1. A coprecipitation technique to prepare NaNbO3 and NaTaO3

    Indian Academy of Sciences (India)

    V Samuel; A B Gaikwad; V Ravi

    2006-04-01

    A simple coprecipitation technique has been used successfully for the preparation of pure, ultrafine, single phases of NaNbO3 (NN) and NaTaO3 (NT). An alcoholic solution of ammonium carbonate and ammonium hydroxide was used to precipitate Na+ and Nb5+ (or Ta5+) cations under basic conditions as carbonate and hydroxide, respectively. On heating at 700°C, these precursors produce respective products. For comparison, both NN and NT powders were also prepared by the traditional solid state method. The phase purity and lattice parameters were studied by powder X-ray diffraction (XRD). The particle size and morphology were studied by scanning electron microscopy (SEM).

  2. Jahn–Teller Assisted Na Diffusion for High Performance Na Ion Batteries

    Energy Technology Data Exchange (ETDEWEB)

    Li, Xin [Harvard Univ., Cambridge, MA (United States). John A. Paulson School of Engineering and Applied Sciences; Wang, Yan [Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States). Dept. of Materials Science and Engineering; Wu, Di [Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States). Dept. of Mechanical Engineering; Liu, Lei [Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States). Dept. of Materials Science and Engineering; Bo, Shou-Hang [Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States). Dept. of Materials Science and Engineering; Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Dept. of Materials Science and Engineering; Ceder, Gerbrand [Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Dept. of Materials Science and Engineering; Univ. of California, Berkeley, CA (United States). Dept. of Materials Science and Engineering

    2016-08-30

    Na energy storage technology is strategically attractive for large scale applications such as grid energy storage. Here, we show in this paper that there is a clear relation between the Jahn$-$Teller activity of a transition metal ion at the end of charge and the mobility of Na in a cathode material. This is particularly important as mobility at the end of charge limits the capacity of current materials. Consequently, by using this classical piece of physics in the battery world, it is possible to create higher capacity Na-cathode materials. Even more exciting is that the ideal element to impart this effect on cathodes is Fe, which is the least expensive of the transition metal oxides and can therefore enable low cost cathode materials.

  3. Recent results from NA61/SHINE and comparison to NA49

    CERN Document Server

    Mackowiak-Pawlowska, Maja

    2013-01-01

    The NA61/SHINE experiment aims to discover the critical point of strongly interacting matter and study properties of the onset of deconfinement. It also performs precise hadron production measurements for the neutrino and cosmic rays experiments. These goals are being achieved by measurements of hadron production properties in nucleus-nucleus, proton-proton and proton/pion-nucleus interactions as a function of collision energy and size of the colliding nuclei. This contribution presents preliminary results from the NA61 ion program on single-particle spectra and identified particle multiplicity fluctuations in p+p interactions at the CERN SPS. Comparisons with results from p+p and Pb+Pb collisions obtained by the NA49 experiment are shown.

  4. Na,K-pump modulates intercellular communication in vascular wall

    DEFF Research Database (Denmark)

    Matchkov, Vladimir; Nilsson, Holger; Aalkjær, Christian

      Ouabain, a specific inhibitor of the Na,K-pump, has previously been shown to interfere with intercellular communication. Here we test the hypothesis that the communication between vascular smooth muscle cells (SMCs) is regulated through an interaction between the Na,K-pump and the Na,Ca-exchanger....... Immunohistochemical analysis suggested that a ouabain-sensitive α2 isoform of the Na,K-pump involved in this interaction. The experiments suggest that the Na,K-pump may affect gap junction conductivity via localized changes in intracellular calcium concentration through modulation of Na,Ca-exchanger activity....... were used as a model for electrical coupling of SMCs by measuring membrane capacitance (Cm). SMCs were uncoupled (evaluated by inhibition of vasomotion and desynchronization of calcium transients in vascular wall, or by reduction to half of Cm measured in paired A7r5 cells) when the Na,K-pump...

  5. Tecnologias na Web 2.0 : o empoderamento na educação aberta

    OpenAIRE

    Santarosa, Lucila Maria Costi; Conforto, Debora; Schneider, Fernanda Chagas

    2013-01-01

    Esse artigo problematiza a utilização de recursos educacionais abertos, na perspectiva da web 2.0, como tecnologias impulsionadoras de movimentos educativos formais e não formais. Por meio de experiências na formação de educadores em cursos de pós-graduação, discutimos o conceito de empoderamento e os princípios que estruturam a Educação Aberta, para referendar a importância de aproximar sujeitos em processo de formação de sistemas Web abertos instituindo e ampliando os tempos-espaços da apre...

  6. Dieta rica em proteína na redução do peso corporal

    OpenAIRE

    Pedrosa,Rogerio Graça; DONATO JUNIOR, Jose; Tirapegui, Julio

    2009-01-01

    A proporção ideal dos macronutrientes em dietas de emagrecimento é atualmente bastante discutida. Existem evidências de que dietas com maior proporção de proteína aumentam a perda de peso e de gordura corporal e diminuem a perda de massa corporal magra durante o emagrecimento. Todavia, os mecanismos responsáveis por estes efeitos não estão totalmente esclarecidos. Além disso, existem poucas conclusões a respeito dos possíveis efeitos colaterais dessas dietas na função renal e no estado nutric...

  7. Direct Reactions with MoNA-LISA

    Science.gov (United States)

    Kuchera, Anthony

    2016-03-01

    Nuclear reactions can be used to probe the structure of nuclei. Direct reactions, which take place on short time scales, are well-suited for experiments with beams of short-lived nuclei. One such reaction is nucleon knockout where a proton or neutron is removed from the incoming beam from the interaction with a target. Single nucleon knockout reactions have been used to study the single-particle nature of nuclear wave functions. A recent experiment at the National Superconducting Cyclotron Laboratory was performed to measure cross sections from single nucleon knockout reactions for several p-shell nuclei. Detection of the residual nucleus in coincidence with any gamma rays emitted from the target allowed cross sections to ground and excited states to be measured. Together with input from reaction theory, ab initio structure theories can be tested. Simultaneously the accuracy of knockout reaction models can be validated by detecting the knocked out neutron with the Modular Neutron Array and Large multi-Institutional Scintillator Array (MoNA-LISA). Preliminary results from this experiment will be shown. Knockout reactions can also be used to populate nuclei which are neutron unbound, thus emit neutrons nearly instantaneously. The structure of these nuclei, therefore, cannot be probed with gamma ray spectroscopy. However, with large neutron detectors like MoNA-LISA the properties of these short-lived nuclei are able to be measured. Recent results using MoNA-LISA to study the structure of neutron-rich nuclei will be presented. The author would like to acknowledge support from the NNSA and NSF.

  8. NaI(Tl) response functions

    Energy Technology Data Exchange (ETDEWEB)

    Vega C, H. R.; Ortiz R, J. M. [Universidad Autonoma de Zacatecas, Unidad Academica de Estudios Nucleares, Cipres No. 10, Fracc. La Penuela, 98068 Zacatecas, Zac. (Mexico); Benites R, J. L. [Centro Estatal de Cancerologia de Nayarit, Calz. de la Cruz 118 Sur, Tepic, Nayarit (Mexico); De Leon M, H. A., E-mail: fermineutron@yahoo.com.mx [Instituto Tecnologico de Aguascalientes, Av. Adolfo Lopez Mateos 1801 Ote., 20155 Aguascalientes, Ags. (Mexico)

    2015-09-15

    The response functions of a NaI(Tl) detector have been estimated using Monte Carlo methods. Response functions were calculated for monoenergetic photon sources (0.05 to 3 MeV). Responses were calculated for point-like sources and for sources distributed in Portland cement cylinders. The responses were used to calculate the efficiency functions in term of photon energy. Commonly, sources used for calibration are point-like, and eventually sources to be measured have different features. In order to use the calibrated sources corrections due to solid angle, self-absorption and scattering, must be carried out. However, some of these corrections are not easy to perform. In this work, the calculated responses were used to estimate the detector efficiency of point-like sources, and sources distributed in Portland type cement. Samples of Portland paste were prepared and were exposed to photoneutrons produced by a 15 MV linac. Some of the elements in the cement were activated producing γ-emitting radionuclides that were measured with a NaI(Tl) gamma-ray spectrometer, that was calibrated with point-like sources. In order to determine the specific activity in the induced radioisotopes calculated efficiencies were used to make corrections due to the differences between the solid angle, photon absorption and photon scattering in the point-like calibration sources and the sources distributed in cement. During the interaction between photoneutrons and the cement samples three radioisotopes were induced: {sup 56}Mn, {sup 24}Na, and {sup 28}Al. (Author)

  9. Linguagens na TV Languages on tv

    Directory of Open Access Journals (Sweden)

    Glaucia Guimarães

    2008-06-01

    Full Text Available Este artigo aborda questões relativas às estratégias discursivas utilizadas na produção dos textos televisivos. Com base na Análise Crítica de Discurso (ACD, nos termos em que é formulada por Norman Fairclough, o trabalho analisa os modos pelos quais as linguagens (incluindo materiais semióticos diversos são articuladas na/pela TV, sistematiza as relações entre a articulação de linguagens e a produção de efeitos de sentido, bem como os modos de sua inscrição nas tendências discursivas contemporâneas, a saber: democratização, tecnologização e comodificação. A partir das relações entre as práticas de linguagem e as tendências destacadas, o artigo tece considerações sobre as condições de produção de leituras críticas dos textos multimidiáticos, nas suas múltiplas dimensões: dos contextos e mecanismos da produção textual à pluralidade constitutiva de sua recepção.This paper deals with issues related to discursive strategies in the production of TV texts. Based on Critical Discourse Analysis (CDA, as formulated by Norman Fairclough, it analyzes the ways languages (including several semiotic materials are articulated in order to produce a range of wanted meaning effects, as well as the ways they are inscribed in the contemporary discursive trends discussed by the author, namely: democratization, technologization and commodification. Departing from the analysis of language practices and the discursive trends underlined, the paper aims at clarifying the multiple dimensions of multimedia conditions of production, focusing on both the context and the mechanisms and the diverse reception (reading possibilities.

  10. Reinterpretacija na krilatata zmija (drakon v hristijanskata tradicija: Po povod ukrasata na Divoševoto evangelie

    Directory of Open Access Journals (Sweden)

    Džurova Aksinija

    2009-01-01

    Full Text Available (bugarski V statijata se razgležda edin ot motivite v ukrasata na Divoševoto evangelie ot XIV v. - tozi na krilatija drakon (na mesta s kozja glava i podobnata na nego ukrasa v sr'bski, gr'cki i ruski r'kopisi, povlijani v svojata dekoracija ot romanskoto izkustvo, koeto ot svoja strana interpretira rannohristijanski motivi, vlezli v r'kopisnija repertoar na gr'ckite kodeksi ošče prez X-XI v. i otnovo pojavili se v k'snovizantijskata tradicija.

  11. VPLIV GLASOVNEGA ZAVEDANJA NA PISANJE IN BRANJE

    OpenAIRE

    Lahovnik, Janja

    2010-01-01

    Prvo triletje osnovne šole pokriva prvo fazo opismenjevanja, to je učenje branja in pisanja, ob tem pa razvijanje sposobnosti poslušanja in govorjenja. Prvi je proces dekodiranja besed oziroma vzpostavitev odnosa med črko in glasom. Najprej učenci spoznajo znake za črke in glasove, nato pa sledita branje in pisanje. Drugi proces zajema uporabo govornih sposobnosti, ki se kažejo na razumevanju prepoznanih besed. Obvladovanje abecednega zapisovanja zahteva sposobnosti zavedanja besed, zlogov in...

  12. As emoções na fala

    OpenAIRE

    Rodrigues, Américo Jorge Monteiro

    2007-01-01

    No presente trabalho analisamos algumas características acústicas (duração, frequência fundamental, F1 e F2) de um pequeno corpus de “voz emocional”, em Português Europeu, gravado por um actor. Procedemos também a testes de percepção desse corpus, a que se submeteu um grupo diversificado e o informante. Reflectimos também acerca do envolvimento emocional dos actores na construção de personagens, usando a voz. ABSTRACT: In the present work we analyse several acoustic charac...

  13. MICOTOXINAS DO FUSARIUM spp NA AVICULTURA COMERCIAL

    OpenAIRE

    Santin, Elizabeth; Maiorka,Alex; Zanella,Irineo; Magon,Leandro

    2001-01-01

    Micotoxinas são metabólitos tóxicos produzidos por fungos, de natureza heterogênea e com variados princípios farmacológicos, que podem atuar sobre o organismo animal prejudicando o seu desempenho e desenvolvendo alterações patológicas graves. Nos últimos anos, as micotoxicoses têm recebido especial atenção devido às enormes perdas que vem causando na avicultura mundial. Fungos do gênero Fusarium são descritos como produtores de diversos tipos de toxinas. Assim sendo, as intoxicações causadas ...

  14. Results on leptonic probes from NA50

    CERN Document Server

    Alessandro, B; Arnaldi, R; Atayan, M; Baglin, C; Baldit, A; Bedjidian, Marc; Beolè, S; Boldea, V; Bordalo, P; Borenstein, S R; Borges, G; Bussière, A; Capelli, L; Castanier, C; Castor, J I; Chaurand, B; Cheynis, B; Chiavassa, E; Cicalò, C; Claudino, T; Comets, M P; Constantinescu, S; Cortese, P; Cruz, J; De Falco, A; De Marco, N; Dellacasa, G; Devaux, A; Dita, S; Drapier, O; Espagnon, B; Fargeix, J; Force, P; Gallio, M; Gavrilov, Yu K; Gerschel, C; Giubellino, P; Golubeva, M B; Gonin, M; Grigorian, A A; Grigorian, S; Grossiord, J Y; Guber, F F; Guichard, A; Gulkanian, H R; Hakobyan, R S; Haroutunian, R; Idzik, M; Jouan, D; Karavitcheva, T L; Kluberg, L; Kurepin, A B; Le Bornec, Y; Lourenço, C; Macciotta, P; MacCormick, M; Marzari-Chiesa, A; Masera, M; Masoni, A; Monteno, M; Musso, A; Petiau, P; Piccotti, A; Pizzi, J R; Prado da Silva, W L; Prino, F; Puddu, G; Quintans, C; Ramello, L; Ramos, S; Rato-Mendes, P; Riccati, L; Romana, A; Santos, H; Saturnini, P; Scalas, E; Scomparin, E; Serci, S; Shahoyan, R; Sigaudo, F; Sitta, M; Sonderegger, P; Tarrago, X; Topilskaya, N S; Usai, G L; Vercellin, Ermanno; Villatte, L; Willis, N; Wu, T

    2003-01-01

    The NA50 Collaboration has performed a new measurement of the J/ psi yield in Pb-Pb collisions at 158 GeV/nucleon in improved experimental conditions. Our preliminary analysis of the year 2000 data sample, while confirming the onset of anomalous suppression and the non saturation of the J/ psi /Drell-Yan cross-section ratio, shows that peripheral Pb-Pb interactions follow the normal nuclear absorption pattern, which has in turn been established more precisely thanks to high statistics p-A data. (11 refs).

  15. DEPRESSÃO E ENVELHECIMENTO NA CONTEMPORANEIDADE

    Directory of Open Access Journals (Sweden)

    Delia Catullo Goldfarb

    2010-02-01

    Full Text Available RESUMO: O presente texto reproduz os trabalhos apresentados em mesa redonda sobre depressão e envelhecimento na contemporaneidade no III Congresso Ibero-americano de Psicogerontologia, realizado em novembro de 2010 em São Paulo. Estes trabalhos são resultado de reflexões precedentes em um grupo de estudos e de discussão de casos clínicos composto por psicanalistas. A depressão é uma figura psicopatológica de presença maciça nos dias de hoje. Na velhice o acúmulo de perdas e a aproximação da morte podem produzir um estado de tristeza, fundo depressivo que caracteriza um momento de recolhimento em que ocorrem os processos de luto. Em alguns sujeitos o que se verifica é a instalação de um episódio depressivo que indica a paralisação destes processos elaborativos e a progressão de um esvaziamento do sentido para a vida, restando, neste contexto, apenas a espera pela morte. Neste trabalho serão discutidos aspectos que concernem a vivência destas duas modalidades de enfrentamento da entrada na velhice, levando-se em conta as maneiras como a cultura pode favorecer a ocorrência destes percursos distintos do envelhecer, e como ela os aloja atualmente em um movimento de desconsideração da subjetividade: desanimo da velhice ou problema neuroquímico? Serão apresentadas hipóteses para a produção da depressão como psicopatologia no envelhecimento e reflexões sobre observações clínicas que derivam destes quadros clínicos, tais como: a crise da percepção da entrada na velhice, o corpo hipocondríaco, a paralisia do tempo, a vivência do desamparo. Palavras-chave: depressão, envelhecimento, cultura, corpo, tempo

  16. Da mulher na Bíblia

    Directory of Open Access Journals (Sweden)

    Jacó Guinsburg

    2013-03-01

    Full Text Available Este artigo discute a figura e a representação da mulher na Bíblia. Elas são multidão no relato bíblico. Desde Eva, a cada página surge um vulto de mulher. Virtuoso ou pecador, desalmado ou abnegado, terno ou tirânico, ele suscita, hoje como outrora, a impressão viva de um temperamento, de um gesto, de um sentimento. O jogo sutil da psicologia e das motivações femininas, das suas relações com o mundo masculino, continua palpitando nas heroínas das Escrituras.

  17. Laparoscopia na abordagem inicial de tumores anexiais

    OpenAIRE

    2014-01-01

    OBJETIVO: Avaliar o uso da laparoscopia como método diagnóstico e terapêutico na abordagem inicial de tumores anexiais em população de risco para malignidade, bem como fatores clínicos associados à falha do método e conversão para laparotomia, e comparar taxas de complicação com pacientes cuja abordagem inicial se deu por laparotomia. MÉTODOS: Estudo prospectivo com 210 mulheres com exames de imagem prévios constando tumor an...

  18. O satanismo na obra de Julio Perneta

    OpenAIRE

    Natalia Simões de Vicente

    2004-01-01

    Resumo: Este trabalho consiste, primeiramente, na compilação da obra de Júlio Perneta. Como conseqüência da compilação, passa-se a fazer a análise dos recursos literários utilizados, pelo poeta, para a construção de uma atmosfera satânica nos livros Bronzes e Malditos. inicialmente, para melhor situar o autor e sua obra, discutem-se o contexto histórico e cultural do Simbolismo no Brasil e em Curitiba, bem como se estuda o movimento anticlerical paranaense, do qual o poeta fez parte. A seg...

  19. Sindromi prenaprezanja na potkoljenici i stopalu

    OpenAIRE

    Smerdelj, Miroslav; Madjarević, Mladen; OREMUŠ, KREŠIMIR

    2002-01-01

    U radu autori opisuju i objašnjavaju nastanak bolnih sindroma u području potkoljenice i stopala, vezanih uz profesiju odnosno sportsku aktivnost. Iznose se zapažanja i iskustva iz svakodnevne liječničke prakse, a i podaci iz novije medicinske literature. Značenje se daje liječenju koje je obično konzervativno, a od kirurških metoda naglasak se daje na nove manje invazivne metode. U radu su opisani najčešći sindromi prenaprezanja u području potkoljenice kao što su trkačka potkoljenica, sindrom...

  20. Cerenkov counter for the experiment NA3

    CERN Multimedia

    1978-01-01

    The program of the NA3 experiment included the study of hadronic interactions with a large transverse momentum pT, thus the inclusion in the set-up of three gas threshold Cerenkov counters of large acceptance. The photo shows the downstream part of the second Cerenkov (located at the output of the magnet). The yellow membrane is a temporary protection for the optics (shown in photo 7810540X) to be taken away when fixing this part to the gas tank (entering the magnet and not shown). The photomultipliers all around are heavily shielded.

  1. DESENVOLVIMENTO MORAL E INDISCIPLINA NA ESCOLA

    Directory of Open Access Journals (Sweden)

    Rita Melissa Lepre

    2009-12-01

    Full Text Available O presente artigo configura-se como uma reflexão acerca da indisciplina e suas possíveis causas. Para debater sobre o assunto apresentamos a teoria do desenvolvimento moral de Jean Piaget e articulamos suas descobertas com a questão da indisciplina na escola. São feitas, ainda, reflexões sobre o ambiente em que nossas crianças encontram-se inseridas por, pelo menos, cinco horas diárias.

  2. Ensino de geometria descritiva: inovando na metodologia

    Directory of Open Access Journals (Sweden)

    Regina Coeli Moraes Kopke

    2001-03-01

    Full Text Available Com base na observação, durante anos de magistério superior, na área de desenho, dos alunos de Engenharia, Matemática, Arquitetura e Artes, quanto às dificuldades encontradas por eles no aprendizado de desenho, em especial da Geometria Descritiva, é que nos propusemos, em 1999, lecionar essa disciplina para os cursos de Arquitetura e Artes, adotando uma metodologia diferente da convencional, para despertar, no aluno, o gosto pela disciplina e o desenvolvimento de uma habilidade pouco trabalhada na escola: a visão espacial. Mostrar para os alunos que essa disciplina não é difícil, mas apenas diferente daquilo que estudaram até então, tornou-se nossa meta. A visão espacial é uma habilidade mental localizada no lado direito do cérebro e, assim, quanto mais lúdica for esta aprendizagem, será mais bem assimilada. A proposta é iniciada no sentido de se trabalhar primeiro com sólidos: neles estarão os pontos, retas e planos normalmente abordados na metodologia convencional, nessa ordem. Como conclusão, tem-se que o importante é ressaltar o grande avanço que a Geometria Descritiva traz para quem quer representar graficamente qualquer coisa. Onde há planejamento, projeto e representação gráfica, aí estará a Geometria Descritiva.During many years observing the teaching of design at the Engineering, Mathematics, Architeture and Arts courses, we can note the difficulties of the students to learn it, specially the descriptive geometry. Because of that, we decided to teach this discipline to the Architeture and Arts courses, using a new metodology to make the students motivated to study and to learn, and trying to develop their their spatial vision. We want to show to the students that this discipline is not so difficult as they think, but show them that is only different. The spatial vision is a mental skill found at the right side of the brain and the more soft the learning is, the more it is assimilated by the brain. The

  3. The NA62 Gigatracker pixel detector system

    Energy Technology Data Exchange (ETDEWEB)

    Mazza, G., E-mail: mazza@to.infn.i [INFN, sezione di Torino, 10125 Torino (Italy); Ceccucci, A. [CERN, CH-1211, Geneva 23 (Switzerland); Cortina, E. [UCL, Louvain la Neuve (Belgium); Cotta Ramusino, A. [INFN, sezione di Ferrara, 44100 Ferrara (Italy); Dellacasa, G. [INFN, sezione di Torino, 10125 Torino (Italy); Fiorini, M. [CERN, CH-1211, Geneva 23 (Switzerland); Garbolino, S. [INFN, sezione di Torino, 10125 Torino (Italy); Jarron, P.; Kaplon, J.; Kluge, A. [CERN, CH-1211, Geneva 23 (Switzerland); Marchetto, F. [INFN, sezione di Torino, 10125 Torino (Italy); Martin, E. [UCL, Louvain la Neuve (Belgium); Martoiu, S. [INFN, sezione di Torino, 10125 Torino (Italy); Noy, M. [CERN, CH-1211, Geneva 23 (Switzerland); Petrucci, F. [INFN, sezione di Ferrara, 44100 Ferrara (Italy); Riedler, P. [CERN, CH-1211, Geneva 23 (Switzerland); Rivetti, A. [INFN, sezione di Torino, 10125 Torino (Italy); Tiuraniemi, S. [CERN, CH-1211, Geneva 23 (Switzerland)

    2010-05-21

    The silicon tracker for the NA62 experiment has to provide both a time resolution of 150 ps rms and a space resolution of about 100{mu}mrms. These challenging specifications require the development of a new readout electronics in order to address the problem of measuring the tracks arrival time with such a high channel density. Moreover, the high particle density (up to 1.5MHz/mm{sup 2} in the center and 0.8-1 GHz in total) requires a high speed measurement and data transmission in order to keep the dead time below 1%.

  4. Bullying e peer status na escola

    OpenAIRE

    Sequeira, Paulo Jorge Ferreira Pinto

    2009-01-01

    O presente trabalho propõe-se realizar, na sequência da Suficiência Investigadora que se debruçou genericamente sobre o tema do bullying (acoso escolar), uma análise exaustiva da associação entre a estrutura sócio-afectiva (peer status) em sala de aula e a incidência de bullying (acoso moral), em alunos do 4.º ano de escolaridade. Sustentar-se-á essa análise no marco teórico validado em sede de defesa da suficiência, devidamente actualizado e direccionado para a reflexão autora...

  5. Erro humano na saúde

    OpenAIRE

    Seitz, Eva Maria

    2015-01-01

    Tese (doutorado) - Universidade Federal de Santa Catarina, Centro Tecnológico, Programa de Pós-Graduação em Engenharia de Produção, Florianópolis, 2015. O presente estudo foi desenvolvido com o objetivo propor diretrizes para impedir ocorrência do erro no preparo, administração e monitoramento de Medicamentos Potencialmente Perigosos (MPPs) por via intravenosa em um Serviço de Emergência Adulto num hospital escola, com ênfase na ergonomia, visando à segurança do paciente e trabalhadores. O...

  6. The NA62 experiment at CERN

    Science.gov (United States)

    Piccini, Mauro

    2016-11-01

    The rare decays K → πvv¯ are excellent processes to make tests of new physics at the highest scale complementary to LHC thanks to their theoretically cleanness. The NA62 experiment at CERN SPS aims to collect of the order of 100 events in two years of data taking for the decay K+ → π+vv¯, keeping the background at the level of 10%. Part of the experimental apparatus has been commissioned during a technical run in 2012. The diverse and innovative experimental techniques will be explained and some preliminary results obtained during the 2014 pilot run will be reviewed.

  7. The NA62 experiment at CERN

    Directory of Open Access Journals (Sweden)

    Piccini Mauro

    2016-01-01

    Full Text Available The rare decays K → πvv̄ are excellent processes to make tests of new physics at the highest scale complementary to LHC thanks to their theoretically cleanness. The NA62 experiment at CERN SPS aims to collect of the order of 100 events in two years of data taking for the decay K+ → π+vv̄, keeping the background at the level of 10%. Part of the experimental apparatus has been commissioned during a technical run in 2012. The diverse and innovative experimental techniques will be explained and some preliminary results obtained during the 2014 pilot run will be reviewed.

  8. Status of the NA62 Experiment

    Science.gov (United States)

    Palladino, Vito

    2016-04-01

    The rare decays {{{K}}^ + } to {π ^ + }{{ν bar ν }} are excellent processes to make tests of new physics at the highest scale complementary to LHC thanks to their theoretically cleaness. The NA62 experiment at CERN SPS aims to collect of the order of 100 events in two years of data taking, keeping the background at the level of 10%. Part of the experimental apparatus has been commissioned during a technical run in 2012. The physics prospects and the status of the experiment will be reviewed after the commissioning run of 2014 and the data taking in 2015.

  9. SMIČNA STABILNOST MOTORNIH ULJA

    OpenAIRE

    Cerny, Jaroslav; Vaclavickova, Ivana

    2006-01-01

    Sažetak U radu se sažimaju utjecaji na viskoznost motornoga ulja, poput smične stabilnosti modifikatora viskoznosti, udjela goriva i/ili čađe te degradacije ulja izazvane toplinskom oksidacijom. Značaj pojedinačnih vidova praćen je za nekoliko motornih ulja različitih gradacija viskoznosti cestovnim radom vozila s benzinskim motorom, kao i onih s dizelovim motorima. Trendovi promjene viskoznosti praćeni su i procjenjivani.

  10. Torcicolo adquirido na criança

    OpenAIRE

    Regala, Joana; Martins, Joana; Dias, Ana Isabel; Moreira, Ana; Neves, Manuel Cassiano

    2013-01-01

    O torcicolo adquirido na criança é uma manifestação clínica de múltiplas etiologias possíveis, que se podem agrupar em entidades musculoesqueléticas de origem traumática, infecciosa, inflamatória e tumoral, e entidades não musculo-esqueléticas de origem neurológica, oftalmológica, otorrinolaringológica,gastroenterológica e tumoral do sistema nervoso central. Assim existe um amplo espectro de gravidade,desde processos benignos e autolimitados tal como o torcicolo traumático até quadros graves ...

  11. A celulose na farmácia

    OpenAIRE

    Lima Neto, Severino Antonio de; Petrovick, Pedro Ros

    1997-01-01

    Derivados de celulose ocupam um lugar de destaque entre os adjuvantes farmacêuticos modernos. A ampla gama de aplicação da celulose e de seus derivados abrange das formas farmacêuticas sólidas, como aglutinantes, desintegrantes ou filmógenos, até formas farmacêuticas semi-sólidas, onde são empregados, especialmente como formadores de hidrogéis. Esta revisão apresenta alguns dos compostos de celulose mais empregados na prática farmacêutica como adjuvantes farmacêuticos, dando ênfase aos adjuva...

  12. Ajustamento emocional e coping na compulsividade sexual

    OpenAIRE

    2012-01-01

    Nos últimos anos a comunidade científica tem prestado especial atenção às características do comportamento sexual compulsivo, bem como da sua etiologia e conceptualização, existindo ainda alguma controvérsia relativamente a estes quesitos. O presente estudo teve como objectivos analisar o papel do ajustamento emocional/psicopatologia na compulsividade sexual em jovens/estudantes universitários de ambos os sexos, assim como avaliar se a resposta sexual (desejo e excitação sex...

  13. Interactions between Na+ channels and Na+-HCO3- cotransporters in the freshwater fish gill MR cell: a model for transepithelial Na+ uptake.

    Science.gov (United States)

    Parks, Scott K; Tresguerres, Martin; Goss, Greg G

    2007-02-01

    Isolated mitochondria-rich (MR) cells from the rainbow trout gill epithelium were subjected to intracellular pH (pH(i)) imaging with the pH-sensitive dye BCECF-AM. MR cells were categorized into two distinct functional subtypes based on their ability to recover pH(i) from an NH(4)Cl-induced acidification in the absence of Na(+). An apparent link between resting pH(i) and Na(+)-independent pH(i) recovery was made. We observed a unique pH(i) acidification event that was induced by extracellular Na(+) addition. This further classified the mixed MR cell population into two functional subtypes: the majority of cells (77%) demonstrated the Na(+)-induced pH(i) acidification, whereas the minority (23%) demonstrated an alkalinization of pH(i) under the same circumstances. The focus of this study was placed on the Na(+)-induced acidification and pharmacological analysis via the use of amiloride and phenamil, which revealed that Na(+) uptake was responsible for the intracellular acidification. Further experiments revealed that pH(i) acidification could be abolished when Na(+) was allowed entry into the cell, but the activity of an electrogenic Na(+)-HCO(3)(-) cotransporter (NBC) was inhibited by DIDS. The electrogenic NBC activity was supported by a DIDS-sensitive, Na(+)-induced membrane potential depolarization as observed via imaging of the voltage-sensitive dye bis-oxonol. We also demonstrated NBC immunoreactivity via Western blotting and immunohistochemistry in gill tissue. We propose a model for transepithelial Na(+) uptake occurring via an apical Na(+) channel linked to a basolateral, electrogenic NBC in one subpopulation of MR cells.

  14. Novel regulation of cell [Na(+)] in macula densa cells: apical Na(+) recycling by H-K-ATPase.

    Science.gov (United States)

    Peti-Peterdi, János; Bebok, Zsuzsa; Lapointe, Jean-Yves; Bell, P Darwin

    2002-02-01

    Na-K-ATPase is the nearly ubiquitous enzyme that maintains low-Na(+), high-K(+) concentrations in cells by actively extruding Na(+) in exchange for K(+). The prevailing paradigm in polarized absorbing epithelial cells, including renal nephron segments and intestine, has been that Na-K-ATPase is restricted to the basolateral membrane domain, where it plays a prominent role in Na(+) absorption. We have found, however, that macula densa (MD) cells lack functionally and immunologically detectable amounts of Na-K-ATPase protein. In fact, these cells appear to regulate their cytosolic [Na(+)] via another member of the P-type ATPase family, the colonic form of H-K-ATPase, which is located at the apical membrane in these cells. We now report that this constitutively expressed apical MD colonic H-K-ATPase can function as a Na(H)-K-ATPase and regulate cytosolic [Na(+)] in a novel manner. This apical Na(+)-recycling mechanism may be important as part of the sensor function of MD cells and represents a new paradigm in cell [Na(+)] regulation.

  15. [Effects of NaCl stress on the seedling growth and K(+)- and Na(+) -allocation of four leguminous tree species].

    Science.gov (United States)

    Mo, Hai-Bo; Yin, Yun-Long; Lu, Zhi-Guo; Wei, Xiu-Jun; Xu, Jian-Hua

    2011-05-01

    Taking the pot-cultured seedlings of four leguminous tree species (Albizia julibrissin, Robinia pseudoacacia, Sophora japonica, and Gleditsia sinensis) as test materials, this paper studied their growth indices, critical salt concentration (C50), and K+ and Na+ allocation under different levels of NaCl stress, aimed to understand the difference of test tree species in salt tolerance. NaCl stress inhibited the seedling growth of the tree species. Under NaCl stress, the dry matter accumulation decreased, while the root/shoot ratio increased, especially for A. julibrissin and G. sinensis. Quadratic regression analysis showed that the C50 of A. julibrissin, R. pseudoacacia, S. japonica, and G. sinensis was 3.0 per thousand, 5.0 per thousand, 4.5 per thousand, and 3.9 per thousand, respectively, i.e., the salt tolerance of the four tree species was in the order of R. pseudoacacia > S. japonica > G. sinensis > A. julibrissin. In the root, stem, and leaf of the four tree species seedlings, the Na+ content increased with the increase of NaCl stress, while the K+ content (except in the root of A. julibrissin) decreased after an initial increase, resulting in a larger difference in the K+/Na+ ratio in the organs. Under the same NaCl stress, the allocation of Na+ in different organs of the four tree species seedlings decreased in the order of root>stem>leaf, while that of K+ differed with tree species and NaCl stress, and leaf was the main storage organ for K+. The K+/Na+ ratio in different organs decreased in the sequence of leaf>stem>root. R. pseudoacacia under NaCl stress accumulated more K+ and less Na+ in stem and leaf, and had higher K+/Na+ ratio in all organs and higher dry mass, being assessed to be more salt-tolerant. In contrast, A. julibrissin under high NaCl stress accumulated more Na+ in stem and leaf, and had a lower K+/Na+ ratio in all organs and lower dry mass, being evaluated to be lesser salt-tolerant. The K+ accumulation in seedling stem and leaf and the Na

  16. Preparation and characterization of Na3BO3–Na2SO4 glass electrolytes with Na+ ion conductivity prepared by a mechanical milling technique

    Directory of Open Access Journals (Sweden)

    Kenji Suzuki

    2016-03-01

    Full Text Available The (100 − xNa3BO3·xNa2SO4 (0 ≤ x (mol% ≤ 50 glasses were prepared by mechanical milling. Halo patterns were observed in the compositions 0 ≤ x ≤ 50 by XRD measurements. The Raman spectra indicated that all the glasses were composed of BO33− anions, SO42− anions and Na+ cations. The (100 − xNa3BO3·xNa2SO4 glasses showed good deformation properties and a dense pellet was prepared by cold-press. The conductivities of the glasses increased with increasing Na2SO4 content, and the 50Na3BO3·50Na2SO4 glass showed the highest conductivity of 5.9 × 10−8 S cm−1 at 25 °C.

  17. NaSrMn2F7, NaCaFe2F7, and NaSrFe2F7: novel single crystal pyrochlore antiferromagnets

    Science.gov (United States)

    Sanders, M. B.; Krizan, J. W.; Plumb, K. W.; McQueen, T. M.; Cava, R. J.

    2017-02-01

    The crystal structures and magnetic properties of three previously unreported A2B2F7 pyrochlore materials, NaSrMn2F7, NaCaFe2F7, and NaSrFe2F7 are presented. In these compounds, either S  =  2Fe2+ or S  =  5/2Mn2+ is on the B site, while nonmagnetic Na and Ca (Na and Sr) are disordered on the A site. The materials, which were grown as crystals via the floating zone method, display high effective magnetic moments and large Curie-Weiss thetas. Despite these characteristics, no ordering transition is detected. However, freezing of the magnetic spins, characterized by peaks in the susceptibility or specific heat, is observed at very low temperatures. The empirical frustration index, f  =  -θ CW/T f, for the materials are 36 (NaSrMn2F7), 27 (NaSrFe2F7), and 19 (NaCaFe2F7). AC susceptibility, DC susceptibility, and heat capacity measurements are used to characterize the observed spin glass behavior. The results suggest that the compounds are frustrated pyrochlore antiferromagnets with weak bond disorder. The magnetic phenomena that these fluoride pyrochlores exhibit, in addition to their availability as relatively large single crystals, make them promising candidates for the study of geometric magnetic frustration.

  18. Hadron production measurement from NA61/SHINE

    CERN Document Server

    Korzenev, A

    2013-01-01

    New results of NA61/SHINE on determination of charged hadron yields in proton-carbon interactions are presented. They aim to improve predictions of the neutrino flux in the T2K experiment. The data were recorded using a secondary-proton beam of 31 GeV/$c$ momentum from CERN SPS which impinges on a graphite target. To determine the inclusive production cross section for charged pions, kaons and protons the thin ($0.04\\, \\lambda_I$) target was exploited. Results of this measurement are used in the T2K beam simulation program to reweight hadron yields in the interaction vertex. At the same time, NA61/SHINE results obtained with the T2K replica target ($1.9\\, \\lambda_I$) allow to constrain hadron yields at the surface of the target. It would correspond to the constraint up to 90% of the neutrino flux, thus reducing significantly a model dependence of the neutrino beam prediction. All measured spectra are compared to predictions of hadron production models. In addition a status of the analysis of data collected by...

  19. A biotecnologia na agropecuária

    Directory of Open Access Journals (Sweden)

    João Lúcio de Azevedo

    1986-11-01

    Full Text Available This review reports the use of biotechnology in agriculture and animal husbandry. The main techniques and the most important products both in experimental stage or in commercial use are reported. The work intends to give a global vision to the theme, chronologically and spacely, showing the main lines of research and what has been obtained in this area. The techniques and products that are related to genetics and breeding are emphasized. Revisão Bibliográfica do emprego da biotecnologia na agropecuária, mostrando um levantamento das técnicas mais promissoras e de seus principais produtos, tanto em fase experimental como em uso comercial. Pretende-se dar uma visão global do assunto, cronológica e espacialmente, não se prendendo à detalhes, mostrando, em Unhas gerais, o que foi feito e o que se faz, atualmente, em biotecnologia. As técnicas e produtos que influenciam a área de genética e melhoramento genético na agropecuária, são enfatizadas.

  20. Vinhos, Turismo e Pluriatividade na Agricultura

    Directory of Open Access Journals (Sweden)

    Hernanda Tonini

    2013-06-01

    Full Text Available A gastronomia, além de ter importante relação com a economia, é uma forma expressiva da cultura dos indivíduos, desde o tipo de alimentos cultivados até a maneira de seu preparo e consumo. O presente artigo propõe-se a analisar a relação entre o enoturismo – centralizado na existência do vinho enquanto elemento gastronômico – e o fenômeno da pluriatividade na agricultura familiar, vista nos últimos anos como alternativa positiva para sua reprodução econômica e social. O fluxo turístico em regiões vitivinícolas gera novas oportunidades de trabalho e faz com que agricultores e suas famílias dividam a mão de obra agrícola, até então direcionada ao cultivo da uva e outros alimentos para subsistência, com atividades não agrícolas – como o artesanato, o acolhimento de visitantes em pousadas, a atuação em restaurantes, entre outras – como chance de subsistência. Este panorama transforma as realidades do mundo rural, alterando a relação do agricultor com a produção de alimentos e a forma como o mesmo os utiliza, além de reestruturar o ambiente sociocultural no seu entorno.  

  1. Direito do poeta na literatura de cordel

    Directory of Open Access Journals (Sweden)

    Sale Mário Gaudêncio

    Full Text Available Este artigo apresenta uma análise situacional dos direitos autorais na literatura de cordel, especialmente no que se refere à proteção moral e patrimonial que é dada aos poetas populares. Justifica-se o estudo em função de não haver profundas nem atuais discussões teóricas sobre a preservação moral e patrimonial em torno das obras de cordel. Utiliza-se como metodologia a pesquisa bibliográfica relacionada a um corpusque analisa os folhetos impressos por poetas da literatura de cordel. O estudo mostra como resultados o estabelecimento de um modelo alternativo de prazos para os direitos autorais na poesia popular, além da necessidade de ruptura técnica, política e cultural. Conclui informando sobre a importância de se construir um banco de dados nacional para que se tenha conhecimento pleno do quê e como se está produzindo a literatura de cordel, além de saber quem verdadeiramente está sendo beneficiado com tais produções.

  2. Autonomia e vulnerabilidade na vida dos adolescentes

    Directory of Open Access Journals (Sweden)

    Renata R. de Oliveira

    2007-05-01

    Full Text Available Este trabalho foi realizado com a finalidade de estabelecer relações entre os princípios éticos da autonomia e vulnerabilidade e a vida de adolescentes, pessoas reconhecidamente passíveis de síndromes depressivas, uso abusivo de drogas ilícitas, alcoolismo e tabagismo. Famílias desestruturadas, pais ausentes, companhia de amigos que levam a diferentes vícios, facilidade de acesso a fontes desencontradas de informações e uma sociedade indiferente afetam o desenvolvimento normal dos jovens. Considera-se, ainda, o grande desafio apresentado a profissionais de saúde em agir na busca de reduzir a vulnerabilidade dos adolescentes e permitir que os mesmo usem de autonomia com responsabilidade na tomada de decisões em suas vidas pessoais. O cuidado com os mesmos deve ser mais integral e ativo e a sociedade ainda não reconheceu adequadamente a importância de cuidar do desenvolvimento saudável desse imenso contingente humano.

  3. Plantas indicadoras de clomazone na fase vapor

    Directory of Open Access Journals (Sweden)

    Fábio Schreiber

    2013-10-01

    Full Text Available A volatilização representa um processo importante no deslocamento de agrotóxicos para o ambiente. As características físico-químicas da molécula do clomazone indicam que este possui potencial de volatilização. Em vista do exposto, para a realização deste estudo, foram conduzidos dois experimentos com o objetivo de avaliar a suscetibilidade das espécies: pepino, melão, milho, sorgo e arroz a diferentes formulações do herbicida clomazone na fase vapor. Para isso, foram utilizadas caixas de vidro hermeticamente fechadas, com a presença de diferentes formulações de clomazone e as espécies vegetais. As formulações utilizadas foram Gamit 360 CS®, Gamit 500 EC® e Gamit Star®. Com os resultados obtidos, foi possível concluir que, dentre as espécies avaliadas, independente da formulação utilizada, a de menor tolerância ao herbicida clomazone na fase vapor foi o sorgo, seguido do milho e do arroz.

  4. Mercosul educativo na carreira de Enfermagem

    Directory of Open Access Journals (Sweden)

    Roseli Schmoeller

    2012-10-01

    Full Text Available O Mercosul, instituído com vistas à integração econômica, política, social e cultural entre os países membros, atualmente destaca-se pelas estratégias integrativas de âmbito educacional. Este artigo aborda os movimentos acerca da formação acadêmica dos cursos de Enfermagem e o trajeto histórico de integração educacional, apresentando o Sistema de Acreditação dos Cursos Universitários do Mercosul, o ARCU-SUL, além dos setores responsáveis por esse processo e as perspectivas para a Enfermagem nos países do Mercosul. Entendemos que para o desenvolvimento de profissionais críticos, reflexivos e com compromisso político-social, é fundamental investir na formação e na qualidade dos centros de ensino em Enfermagem.

  5. The NA62 GigaTracker

    CERN Document Server

    Perrin-Terrin, Mathieu

    2015-01-01

    The GigaTracker is an hybrid silicon pixel detector built for the NA62 experiment aiming at measuring the branching fraction of the ultra-rare kaon decay K + ! p + n ̄ n at the CERN SPS. The detector has to track particles in a beam with a flux reaching 1.3 MHz/mm 2 and provide single-hit timing with 200ps RMS resolution for a total material budget of less than 1.5 X 0 . The tracker comprises three 60.8mm 27mm stations installed in vacuum ( 10$^{-6}$ mbar) and cooled with liquid C 6 F 14 circulating through micro-channels etched inside few hundred of microns thick silicon plates. Each station is composed of a 200 m m thick silicon sensor readout by 2 x 5 cus- tom 100 m m thick ASIC, called TDCPix. Each chip contains 40 x 45 asynchronous pixels, each 300 m m x 300 m m and is instrumented with 100ps bin time-to-digital converters. In order to cope with the high rate, the TDCPix is equipped with four 3.2Gb/s serialisers sending out the data. We will describe the detector and the results from the 2014 NA62 ru...

  6. Hydrogen sulfide induced disruption of Na+ homeostasis in the cortex.

    Science.gov (United States)

    Chao, Dongman; He, Xiaozhou; Yang, Yilin; Balboni, Gianfranco; Salvadori, Severo; Kim, Dong H; Xia, Ying

    2012-07-01

    Maintenance of ionic balance is essential for neuronal functioning. Hydrogen sulfide (H(2)S), a known toxic environmental gaseous pollutant, has been recently recognized as a gasotransmitter involved in numerous biological processes and is believed to play an important role in the neural activities under both physiological and pathological conditions. However, it is unclear if it plays any role in maintenance of ionic homeostasis in the brain under physiological/pathophysiological conditions. Here, we report by directly measuring Na(+) activity using Na(+) selective electrodes in mouse cortical slices that H(2)S donor sodium hydrosulfide (NaHS) increased Na(+) influx in a concentration-dependent manner. This effect could be partially blocked by either Na(+) channel blocker or N-methyl-D-aspartate receptor (NMDAR) blocker alone or almost completely abolished by coapplication of both blockers but not by non-NMDAR blocker. These data suggest that increased H(2)S in pathophysiological conditions, e.g., hypoxia/ischemia, potentially causes a disruption of ionic homeostasis by massive Na(+) influx through Na(+) channels and NMDARs, thus injuring neural functions. Activation of delta-opioid receptors (DOR), which reduces Na(+) currents/influx in normoxia, had no effect on H(2)S-induced Na(+) influx, suggesting that H(2)S-induced disruption of Na(+) homeostasis is resistant to DOR regulation and may play a major role in neuronal injury in pathophysiological conditions, e.g., hypoxia/ischemia.

  7. NaCl处理对盐地碱蓬开花及Na+、K+含量的影响%Effects of NaCl Treatments on Flower Number, Na+and K+Contents of Suaeda salsa

    Institute of Scientific and Technical Information of China (English)

    郭建荣; 王宝山

    2014-01-01

    To investigate the role of salinity in lfowering of euhalophyte Suaeda salsa, lfower number of differ-ent branches and per plant, Na+, K+content and Na+/K+ratio of leaves, stems and lfowers of S. salsa were deter-mined under conditions of 1 (control), 200 and 400 mmol·L-1 NaCl treatment. Compared with the control, 200 mmol·L-1NaCl treatment signiifcantly increased the lfower number of branches and individual plant of S. salsa, the lfower number per plant increased by 69.90%, Na+content, Na+/K+ratio in the lfowers increased by 1.41 and 1.77 times respectively, Na+content, Na+/K+ratio in the leaves of the ifrst branches increased by 3.96 and 4.96 times respectively, and Na+content, Na+/K+ratio in the stems increased by 7.00 and 12.39 times respectively. Flower number per plant increased by 19.00%under 400 mmol·L-1 NaCl treatment, Na+content and Na+/K+ra-tio in lfowers increased by 2.09 and 3.21 times respectively, Na+content, Na+/K+ratio in the leaves of the ifrst branches increased by 4.28 and 6.50 times respectively, and Na+content, Na+/K+ratio in the stems increased by 7.65 and 15.40 times respectively. These results suggested that certain concentration of external NaCl promotes lfowering of euhalophytes S. salsa possibly via compartmentalization of Na+into leaves and stems and mobili-zation of K+in the leaves and stems into the lfowers to maintain a proper Na+/K+ratio in the lfowers.%为探讨盐地碱蓬(Suaeda salsa)开花与盐的关系,研究了1(对照)、200和400 mmol·L-1 NaCl处理对盐地碱蓬不同分枝和单株开花数目、叶片和茎及花器官中的Na+、K+含量及Na+/K+比的影响。结果表明:与对照相比,200 mmol·L-1 NaCl处理下盐地碱蓬分枝及单株开花数目增加最显著,单株开花数目增加了69.90%,花器官中的Na+含量、Na+/K+比分别增加了1.41倍和1.77倍,而一级叶片的Na+含量、Na+/K+比分别增加了3.96倍和4.96倍,茎中Na+含量、Na+/K+比分别增加了7.00倍和12.39倍。400 mmol

  8. Apical Na+ permeability of frog skin during serosal Cl- replacement.

    Science.gov (United States)

    Leibowich, S; DeLong, J; Civan, M M

    1988-05-01

    Gluconate substitution for serosal Cl- reduces the transepithelial short-circuit current (Isc) and depolarizes short-circuited frog skins. These effects could result either from inhibition of basolateral K+ conductance, or from two actions to inhibit both apical Na+ permeability (PapNa) and basolateral pump activity. We have addressed this question by studying whole-and split-thickness frog skins. Intracellular Na+ concentration (CcNa) and PapNa have been monitored by measuring the current-voltage relationship for apical Na+ entry. This analysis was conducted by applying trains of voltage pulses, with pulse durations of 16 to 32 msec. Estimates of PapNa and CcNa were not detectably dependent on pulse duration over the range 16 to 80 msec. Serosal Cl- replacement uniformly depolarized short-circuited tissues. The depolarization was associated with inhibition of Isc across each split skin, but only occasionally across the whole-thickness preparations. This difference may reflect the better ionic exchange between the bulk medium and the extracellular fluid in contact with the basolateral membranes, following removal of the underlying dermis in the split-skin preparations. PapNa was either unchanged or increased, and CcNa either unchanged or reduced after the anionic replacement. These data are incompatible with the concept that serosal Cl- replacement inhibits PapNa and Na,K-pump activity. Gluconate substitution likely reduces cell volume, triggering inhibition of the basolateral K+ channels, consistent with the data and conclusions of S.A. Lewis, A.G. Butt, M.J. Bowler, J.P. Leader and A.D.C. Macknight (J. Membrane Biol. 83:119-137, 1985) for toad bladder. The resulting depolarization reduces the electrical force favoring apical Na+ entry. The volume-conductance coupling serves to conserve volume by reducing K+ solute loss. Its molecular basis remains to be identified.

  9. Aspectos valorizados por porfissionais de enfermagem na higiene pessoal e na higiene corporal do paciente

    Directory of Open Access Journals (Sweden)

    Elóide André Oliveira

    2003-10-01

    Full Text Available Survey descritivo, com o qual se objetivou identificar que aspectos da higiene corporal são valorizados pelos componentes da equipe de enfermagem, na higiene corporal pessoal e na higiene corporal do paciente. A pesquisa foi desenvolvida em oito instituições públicas de saúde e a amostra foi composta por 126 profissionais de enfermagem, correspondendo a 12,8% do total de 986 componentes das equipes de enfermagem destas instituições. Na higiene corporal pessoal, chamou a atenção o fato de que os cuidados com as unhas e com os cabelos tenham suplantado, no número de citações dos profissionais de enfermagem, aspectos básicos como o cuidado com as mãos. Na higiene corporal do paciente, o banho foi o aspecto considerado mais importante pelas três categorias profissionais; a higiene oral, pelas(os enfermeiras(os e auxiliares de enfermagem; e as unhas, pelas(os enfermeiras(os e técnicas(os de enfermagem.

  10. Theoretical calculation of low-lying states of NaAr and NaXe

    Science.gov (United States)

    Laskowski, B. C.; Langhoff, S. R.; Stallcop, J. R.

    1981-01-01

    Potential curves as well as dipole moments and linking transition moments are calculated for the ground X 2 Sigma + and low lying excited A 2 Pi, B 2 Sigma +, C 2 Sigma +, (4) 2 Sigma +, (2) 2 Pi and (1) 2 Delta states of NaAr and NaXe. Calculations are performed using a self-consistent field plus configuration-interaction procedure with the core electrons replaced by an ab initio effective core potential. The potential curves obtained are found to be considerably less repulsive than the semiempirical curves of Pascale and Vandeplanque (1974) and to agree well with existing experimental data, although the binding energies of those states having potential minima due to van der Waals interactions are underestimated. Emission bands are also calculated for the X 2 Sigma + - C 2 Sigma + excimer transitions of NaAr and NaXe using the calculated transition moments and potential curves, and shown to agree well with experiment on the short-wavelength side of the maximum.

  11. Polarization and Velocity Dependence of Associative Ionization in Na(3p)+Na(3p) Collisions

    NARCIS (Netherlands)

    Meijer, H.A.J.; Meulen, H.P. van der; Morgenstern, R.

    1987-01-01

    We have excited Na atoms of two counterrunning thermal beams by means of linearly polarized laser light and have investigated associative ionization processes. To this end we measured the total ionization signal as a function of the angle θ between light polarization and the relative collision veloc

  12. Na+ overload during ischemia and reperfusion in rat hearts : Comparison of the Na+/H+ exchange blockers EIPA, cariporide and eniporide

    NARCIS (Netherlands)

    ten Hove, M; van Emous, JG; van Echteld, CJA

    2003-01-01

    Intracellular myocardial Na+ overload during ischemia is an important cause of reperfusion injury via reversed Na+/Ca2+ exchange. Prevention of this Na+ overload can be accomplished by blocking the different Na+ influx routes. In this study the effect of ischemic inhibition of the Na+/H+ exchanger (

  13. Efeito do plasma de oxigênio na dentina previamente exposta ao NaOCl

    Directory of Open Access Journals (Sweden)

    Maíra do PRADO

    Full Text Available Resumo Introdução O tratamento de plasma é uma tecnologia eficaz que pode manter as propriedades internas dos materiais inalteradas após o tratamento, modificando apenas a superfície. Objetivo Avaliar o efeito do plasma de oxigênio na dentina previamente exposta ao NaOCl 6%. Material e método Foram utilizados 60 incisivos bovinos. A coroa foi removida, a raiz foi dividida e as faces planificadas, totalizando 120 segmentos referentes ao terço cervical. As amostras foram divididas em dois grupos: controle (imersa em NaOCl 6%, lavada com água destilada, seca, imersa em EDTA 17%, lavada e seca e plasma de oxigênio (após tratamento descrito no grupo controle, plasma de oxigênio foi aplicado por 30 s. As amostras foram avaliadas qualitativamente em relação à topografia por microscopia eletrônica de varredura, utilizando-se microfotografias com ampliação de 1.000×. O goniômetro Ramé-hart foi utilizado para a mensuração do ângulo de contato entre as superfícies e as seguintes soluções foram utilizadas: água, etilenoglicol e di-iodometano. Em seguida, a energia de superfície, representada pelas componentes polar e dispersiva, foi calculada. Avaliou-se também o escoamento dos cimentos Pulp Canal Sealer EWT (PCS e Real Sal SE (RS na superfície dentinária. Os dados foram analisados estatisticamente utilizando os testes Kruskal-Wallis e Mann-Whitney U (p<0,05. Resultado O tratamento com plasma levou à formação de uma camada semelhante à smear layer na superfície dentinária. Este tratamento levou a um aumento da energia de superfície e da componente polar, favorecendo a hidrofilicidade da superfície. Entretanto, desfavoreceu o escoamento do cimento PCS e não influenciou no escoamento do cimento RS. Conclusão O plasma de oxigênio ocasionou mudanças topográficas na superfície dentinária, favorecendo a hidrofilicidade desta. Contudo, não favoreceu o escoamento dos cimentos endodônticos na dentina.

  14. Regulation of persistent Na current by interactions between beta subunits of voltage-gated Na channels.

    Science.gov (United States)

    Aman, Teresa K; Grieco-Calub, Tina M; Chen, Chunling; Rusconi, Raffaella; Slat, Emily A; Isom, Lori L; Raman, Indira M

    2009-02-18

    The beta subunits of voltage-gated Na channels (Scnxb) regulate the gating of pore-forming alpha subunits, as well as their trafficking and localization. In heterologous expression systems, beta1, beta2, and beta3 subunits influence inactivation and persistent current in different ways. To test how the beta4 protein regulates Na channel gating, we transfected beta4 into HEK (human embryonic kidney) cells stably expressing Na(V)1.1. Unlike a free peptide with a sequence from the beta4 cytoplasmic domain, the full-length beta4 protein did not block open channels. Instead, beta4 expression favored open states by shifting activation curves negative, decreasing the slope of the inactivation curve, and increasing the percentage of noninactivating current. Consequently, persistent current tripled in amplitude. Expression of beta1 or chimeric subunits including the beta1 extracellular domain, however, favored inactivation. Coexpressing Na(V)1.1 and beta4 with beta1 produced tiny persistent currents, indicating that beta1 overcomes the effects of beta4 in heterotrimeric channels. In contrast, beta1(C121W), which contains an extracellular epilepsy-associated mutation, did not counteract the destabilization of inactivation by beta4 and also required unusually large depolarizations for channel opening. In cultured hippocampal neurons transfected with beta4, persistent current was slightly but significantly increased. Moreover, in beta4-expressing neurons from Scn1b and Scn1b/Scn2b null mice, entry into inactivated states was slowed. These data suggest that beta1 and beta4 have antagonistic roles, the former favoring inactivation, and the latter favoring activation. Because increased Na channel availability may facilitate action potential firing, these results suggest a mechanism for seizure susceptibility of both mice and humans with disrupted beta1 subunits.

  15. Study on phase equilibria in Na2 B4 O7 -NaBr-Na2 SO4 -H2O quaternary system at 348 K%Na2B4O7-NaBr-Na2SO4-H2O四元体系348K相平衡研究

    Institute of Scientific and Technical Information of China (English)

    宁慧逸; 桑世华; 王丹; 曾晓晓

    2012-01-01

    采用等温溶解平衡法研究Na2B4O7 -NaBr-Na2SO4-H2O四元体系在348 K的相平衡关系,测定了平衡液相的溶解度和密度.根据实验数据绘制相应相图.该四元体系相图中有1个共饱点E,3条单变量曲线E1E,E2E,E3E,3个结晶区的平衡固相分别为:NaBr,Na2SO4和Na2B4O7 · 5H2O.研究结果表明:该四元体系无复盐和固溶体生成,属于简单四元体系,NaBr对Na2B4O7·5H2O和Na2SO4有较强的盐析作用.并对NaBr和Na2B4O7在不同温度下含有的结晶水数进行了对比分析,简要讨论了密度变化规律.%The solubilities and densities of solution in Na2B4O7-NaBr- Na2SO4-H2O quaternary system at 348 K were determined by isothermal equilibrium method. Based on the experimental data, the equilibrium phase diagram was plotted, which consists of one invariant E, three univariant curves (E1E, E2E and E3E) , and three crystallization fields corresponding to NaBr, Na2SO4 and Na2B4O7 ? 5H2O. The experimental results indicate that the quaternary system is of simple eutectic type and no double salt and solid solution, and sodium bromide has the salting-out effect on Na2B4O7 ? 5H2O and Na2SO4. The densities transformation rules were discussed.

  16. Coordinated regulation of cardiac Na(+)/Ca (2+) exchanger and Na (+)-K (+)-ATPase by phospholemman (FXYD1).

    Science.gov (United States)

    Cheung, Joseph Y; Zhang, Xue-Qian; Song, Jianliang; Gao, Erhe; Chan, Tung O; Rabinowitz, Joseph E; Koch, Walter J; Feldman, Arthur M; Wang, JuFang

    2013-01-01

    Phospholemman (PLM) is the founding member of the FXYD family of regulators of ion transport. PLM is a 72-amino acid protein consisting of the signature PFXYD motif in the extracellular N terminus, a single transmembrane (TM) domain, and a C-terminal cytoplasmic tail containing three phosphorylation sites. In the heart, PLM co-localizes and co-immunoprecipitates with Na(+)-K(+)-ATPase, Na(+)/Ca(2+) exchanger, and L-type Ca(2+) channel. The TM domain of PLM interacts with TM9 of the α-subunit of Na(+)-K(+)-ATPase, while its cytoplasmic tail interacts with two small regions (spanning residues 248-252 and 300-304) of the proximal intracellular loop of Na(+)/Ca(2+) exchanger. Under stress, catecholamine stimulation phosphorylates PLM at serine(68), resulting in relief of inhibition of Na(+)-K(+)-ATPase by decreasing K(m) for Na(+) and increasing V(max), and simultaneous inhibition of Na(+)/Ca(2+) exchanger. Enhanced Na(+)-K(+)-ATPase activity lowers intracellular Na(+), thereby minimizing Ca(2+) overload and risks of arrhythmias. Inhibition of Na(+)/Ca(2+) exchanger reduces Ca(2+) efflux, thereby preserving contractility. Thus, the coordinated actions of PLM during stress serve to minimize arrhythmogenesis and maintain inotropy. In acute cardiac ischemia and chronic heart failure, either expression or phosphorylation of PLM or both are altered. PLM regulates important ion transporters in the heart and offers a tempting target for development of drugs to treat heart failure.

  17. The paranodal cytoskeleton clusters Na(+) channels at nodes of Ranvier.

    Science.gov (United States)

    Amor, Veronique; Zhang, Chuansheng; Vainshtein, Anna; Zhang, Ao; Zollinger, Daniel R; Eshed-Eisenbach, Yael; Brophy, Peter J; Rasband, Matthew N; Peles, Elior

    2017-01-30

    A high density of Na(+) channels at nodes of Ranvier is necessary for rapid and efficient action potential propagation in myelinated axons. Na+ channel clustering is thought to depend on two axonal cell adhesion molecules that mediate interactions between the axon and myelinating glia at the nodal gap (i.e., NF186) and the paranodal junction (i.e., Caspr). Here we show that while Na(+) channels cluster at nodes in the absence of NF186, they fail to do so in double conditional knockout mice lacking both NF186 and the paranodal cell adhesion molecule Caspr, demonstrating that a paranodal junction-dependent mechanism can cluster Na(+) channels at nodes. Furthermore, we show that paranode-dependent clustering of nodal Na(+) channels requires axonal βII spectrin which is concentrated at paranodes. Our results reveal that the paranodal junction-dependent mechanism of Na(+)channel clustering is mediated by the spectrin-based paranodal axonal cytoskeleton.

  18. Sociologia na complexidade Sociology in complexity

    Directory of Open Access Journals (Sweden)

    Gilson Lima

    2006-06-01

    Full Text Available O artigo se propõe a fazer uma introdução didática e informativa e, ao mesmo tempo, aprofundada sobre as conseqüências da emergência do paradigma da complexidade para a Sociologia. No desenrolar da narrativa, faz comparações, o que permite ao leitor não familiarizado com a temática da ciência identificar as diferenças macroparadigmáticas pré-modernas, da modernidade simples e da emergência do paradigma da complexidade. Define e exemplifica, sempre que possível, os termos, afirmações e princípios significativos para uma melhor compreensão do tema. Faz, também, inúmeras indicações, no interior da narrativa, de autores e obras, para que aqueles que desejarem continuar, possam mergulhar mais intensamente nos caminhos da sociologia da complexidade. O artigo inicia com uma introdução que define, a partir de Thomas Kuhn, o conceito de paradigma. A seguir, desenvolve de modo comparado, os princípios mais importantes do paradigma da complexidade. E, por fim, chama a atenção para alguns desafios da Sociologia na complexidade, alertando para os riscos da paralisação da complexidade na difícil tarefa de religarmos os saberes diante da hiperespecialização presente na crise do paradigma da modernidade simples.The article is a simultaneously didactic and informative deep introduction on the emergence of the paradigm of complexity for sociology. Along the narrative, we make comparisons, which allows the reader who is not familiar with the themes of science to identify the macro-paradigmatic pre-modern differences from simple modernity and the emergence of the paradigm of complexity. Whenever it is possible, we define and exemplify the terms, assertions, and principles that are significant for an understanding of the theme. We have also made numerous indications of authors and works within the narrative, thus those willing might take a deeper dive in the pathways of sociology of complexity. The article starts with an

  19. Mazungumzo na Adam Shafi juu ya uandishi wake wa riwaya

    OpenAIRE

    Diegner, Lutz; Shafi, Adam

    2012-01-01

    Adam Shafi aliyezaliwa mwaka 1940 kisiwani Unguja ni mmojawapo wa waandishi mashuhuri wa riwaya ya Kiswahili. Hivi sasa mwandishi yumo mbioni kukamilisha muswada wa riwaya yake ya sita iitwayo Mtoto wa Mama. Mbali na uandishi, Adam Shafi aliwahi kufanya kazi mbalimbali za uandishi wa habari na kazi za ushirika wa kimataifa. Ni furaha yetu kubwa kuwa hatimaye tunaweza kutoa mazungumzo hayo baada ya kuyapitia na kuyahariri kidogo tu, kwa vile tunaamini utamu wa lugha inavyozungumzwa katika hali...

  20. Neutron diffraction studies of the Na-ion battery electrode materials NaCoCr2(PO4)3, NaNiCr2(PO4)3, and Na2Ni2Cr(PO4)3

    Science.gov (United States)

    Yahia, H. Ben; Essehli, R.; Avdeev, M.; Park, J.-B.; Sun, Y.-K.; Al-Maadeed, M. A.; Belharouak, I.

    2016-06-01

    The new compounds NaCoCr2(PO4)3, NaNiCr2(PO4)3, and Na2Ni2Cr(PO4)3 were synthesized by sol-gel method and their crystal structures were determined by using neutron powder diffraction data. These compounds were characterized by galvanometric cycling and cyclic voltammetry. NaCoCr2(PO4)3, NaNiCr2(PO4)3, and Na2Ni2Cr(PO4)3 crystallize with a stuffed α-CrPO4-type structure. The structure consists of a 3D-framework made of octahedra and tetrahedra that are sharing corners and/or edges generating channels along [100] and [010], in which the sodium atoms are located. Of significance, in the structures of NaNiCr2(PO4)3, and Na2Ni2Cr(PO4)3 a statistical disorder Ni2+/Cr3+ was observed on both the 8g and 4a atomic positions, whereas in NaCoCr2(PO4)3 the statistical disorder Co2+/Cr3+ was only observed on the 8g atomic position. When tested as negative electrode materials, NaCoCr2(PO4)3, NaNiCr2(PO4)3, and Na2Ni2Cr(PO4)3 delivered specific capacities of 352, 385, and 368 mA h g-1, respectively, which attests to the electrochemical activity of sodium in these compounds.

  1. Simulation of Na D emission near Europa during eclipse

    Science.gov (United States)

    Cassidy, T.A.; Johnson, R.E.; Geissler, P.E.; Leblanc, F.

    2008-01-01

    The Cassini imaging science subsystem observed Europa in eclipse during Cassini's Jupiter flyby. The disk-resolved observations revealed a spatially nonuniform emission in the wavelength range of 200-1050 nm (clear filters). By building on observations and simulations of Europa's Na atmosphere and torus we find that electron-excited Na in Europa's tenuous atmosphere can account for the observed emission if the Na is ejected preferentially from Europa's dark terrain. Copyright 2008 by the American Geophysical Union.

  2. K_4CuNb_8O_(23)掺杂对K_(0.44)Na_(0.52)Li_(0.04)Nb_(0.86)Ta_(0.10)Sb_(0.04)O_3压电陶瓷性能的影响%Effect of K_4CuNb_8O_(23) Doped on the Properties of K_(0.44)Na_(0.52)Li_(0.04)Nb_(0.86)Ta_(0.10)Sb_(0.04)O_3 Piezoelectric Ceramics

    Institute of Scientific and Technical Information of China (English)

    陈燕; 江向平; 涂娜; 冯子义; 陈超; 李月明

    2009-01-01

    采用固相反应法制备了K_(0.44)Na_(0.52)Li_(0.04)Nb_(0.86)Ta_(0.10)Sb_(0.04)O_3+x mol %K_4CuNb_8O_(23)(0≤x≤2)(简称LF4-KCN)无铅压电陶瓷,使用XRD、SEM、 Agilent 4294A精密阻抗分析仪等对该体系的相组成、显微结构、压电及介电等性能进行表征.XRD分析表明,随着KCN含量的增加,室温时样品由四方相向正交相转变,且当x≥1时,出现K_6Li_4Nb_(10)O_(30)杂相.SEM分析表明,掺入KCN后,样品晶粒尺寸减小,晶粒轮廓清晰.随着KCN含量的增加,在100 ℃附近的介电常数温度曲线上出现第二介电常数极大值,即正交→四方铁电相变温度T_(O-T),同时居里温度TC向低温方向移动.KCN掺杂量对LF4的电性能有很大影响,表现为"硬性"掺杂,其压电常数d_(33),平面机电耦合系数k_p,1kHz频率下的介电损耗tanδ和介电常数ε_r均随着 KCN含量的增加而降低,而机械品质因素Q_m整体提高,样品的密度也显著增大.%The K_(0.44)Na_(0.52)Li_(0.04)Nb_(0.86)Ta_(0.10)Sb_(0.04)O_3+x mol%K_4CuNb_8O_(23)(0≤x≤2)(abbreviated as LF4-KCN) lead-free piezoelectric ceramics were fabricated by solid state reaction. The phase, microstructure, electric properties of the samples were characterized by XRD, SEM and Agilent 4294A impedance analyzer. XRD result shows that the phase of the sample transforms from tetragonal into orthorhombic with the increasing of KCN content. When x≥1, the trace amount of second phase K_6Li_4Nb_(10)O_(30) can be detected. SEM shows that the grain size of those materials decreases as the KCN content increasing, and the figure of the grain becomes clearly. There is another dielectric constant maximum value around 100 ℃, which is the phase transition from orthorhombic to tetragonal (T_(O-T)), while the curie temperature (TC) shifts to higher temperature. The KCN-doping has great influence on the electrical properties, the ceramic becomes "hardened", the piezoelectric constant (d_(33)), electromechanical planar

  3. 三元体系NaBr-Na2SO4-H2O 和 NaBr-KBr-H2O 373 K相平衡%Phase Equilibria of Two Ternary Systems NaBr-Na2SO4-H2O and NaBr-KBr-H2O at 373 K

    Institute of Scientific and Technical Information of China (English)

    桑世华; 崔瑞芝; 胡咏霞

    2014-01-01

    针对川西盆地富硼钾溴地下卤水组成,采用等温溶解平衡法研究了三元体系 NaBr-Na2SO4-H2O 和NaBr-KBr-H2O在373 K时的相平衡,测定了373 K条件下平衡溶液的溶解度和密度,根据实验数据绘制相应的相图和密度图。研究发现:两个三元体系在373 K条件下均属于简单共饱和型,无复盐及固溶体生成。相图中均有一个共饱和点,2个平衡固相结晶区和2条单变量曲线。在三元体系NaBr-Na2SO4-H2O中,平衡固相分别为:NaBr和Na2SO4,三元体系NaBr-KBr-H2O相应的平衡固相分别为:NaBr和KBr。并简单讨论了密度的变化规律。%Phase equilibria of two ternary systems NaBr-Na2SO4-H2O and NaBr-KBr-H2O at 373 K were studied by an isothermal solution saturation method. The solubility and density of these systems were determined experimentally and related phase diagrams were obtained. The results show that the two systems are both of simple type with no complex salts or solid solutions formed. Both of the phase diagrams show that they have one eutectic point, two univariant curves and two regions of crystallization. The solid phase in NaBr-Na2SO4-H2O is cpmposited of sodium bromide(NaBr) and sodium sulfate(Na2SO4), while sodium bromide(NaBr) and potassium bromide(KBr) are the components of the solid phase of NaBr-KBr-H2O. Density change of the two systems was discussed.

  4. Inseminación artificial na vaca

    OpenAIRE

    Becerra González, Juan J.

    2011-01-01

    A Obstetricia e Reprodución (131504) é unha materia que se imparte no quinto curso da licenciatura en Veterinaria. Non existen requisitos previos legais e calquera alumno matriculado na licenciatura en Veterinaria pode cursar esta materia. Porén, é conveniente que o alumnado teña coñecementos previos de anatomía e fisioloxía veterinaria, así como de patoloxía xeral e propedeútica clínica. Tamén sería aconsellable que os estudantes teñan coñecementos básicos de TICs, xa que serán de...

  5. The NA49 large acceptance hadron detector

    CERN Document Server

    Afanasiev, S V; Appelshäuser, H; Bächler, J; Barna, D; Barnby, L S; Bartke, Jerzy; Barton, R A; Betev, L; Bialkowska, H; Bieser, F; Billmeier, A; Blyth, C O; Böck, R K; Bormann, C; Bracinik, J; Brady, F P; Brockmann, R; Brun, R; Buncic, P; Caines, H L; Cebra, D; Cooper, G E; Cramer, J G; Csató, P; Cyprian, M; Dunn, J; Eckardt, V; Eckhardt, F; Empl, T; Eschke, J; Ferguson, M I; Fessler, H; Fischer, H G; Flierl, D; Fodor, Z; Frankenfeld, Ulrich; Foka, P Y; Freund, P; Friese, V; Ftácnik, J; Fuchs, M; Gabler, F; Gál, J; Ganz, R E; Gazdzicki, M; Gladysz-Dziadus, E; Grebieszkow, J; Günther, J; Harris, J W; Hegyi, S; Henkel, T; Hill, L A; Hlinka, V; Huang, I; Hümmler, H; Igo, G; Irmscher, D; Ivanov, M; Janik, R; Jacobs, P; Jones, P G; Kadija, K; Kolesnikov, V I; Kowalski, M; Lasiuk, B; Lévai, Peter; Liebicher, K; Lynen, U; Malakhov, A I; Margetis, S; Markert, C; Marks, C; Mayes, B W; Melkumov, G L; Mock, A; Molnár, J; Nelson, J M; Oldenburg, M; Odyniec, Grazyna Janina; Pálla, G; Panagiotou, A D; Pestov, Yu N; Petridis, A; Pikna, M; Pimpl, W; Pinsky, L; Piper, A; Porter, R J; Poskanzer, A M; Poziombka, S; Prindle, D J; Pühlhofer, F; Rauch, W; Reid, J G; Renfordt, R E; Retyk, W; Ritter, H G; Röhrich, D; Roland, C; Roland, G; Rudolph, H; Rybicki, A; Sammer, T; Sandoval, A; Sann, H; Schäfer, E; Schmidt, R; Schmischke, D; Schmitz, N; Schönfelder, S; Semenov, A Yu; Seyboth, J; Seyboth, P; Seyerlein, J; Siklér, F; Sitár, B; Skrzypczak, E; Squier, G T A; Stelzer, H; Stock, Reinhard; Strmen, P; Ströbele, H; Struck, C; Susa, T; Szarka, I; Szentpétery, I; Szymanski, P; Sziklai, J; Toy, M; Trainor, T A; Trentalange, S; Ullrich, T S; Vassiliou, Maria; Veres, G I; Vesztergombi, G; Vranic, D; Wang, F; Weerasundara, D D; Wenig, S; Whitten, C; Wieman, H H; Wienold, T; Wood, L; Yates, T A; Zimányi, J; Zhu, X Z; Zybert, R

    1999-01-01

    The NA49 detector is a wide acceptance spectrometer for the study of hadron production in p+p, p+A, and A+A collisions at the CERN SPS. The main components are 4 large volume TPCs for tracking and particle identification via $dE/dx$. TOF scintillator arrays complement particle identification. Calorimeters for transverse energy determination and triggering, a detector for centrality selection in p+A collisions, and beam definition detectors complete the set-up. A description of all detector components is given with emphasis on new technical realizations. Performance and operational experience are discussed in particular with respect to the high track density environment of central Pb+Pb collisions.

  6. Natureza e economia na teoria freudiana

    OpenAIRE

    Furlan,Reinaldo

    2000-01-01

    O objetivo deste artigo é apontar, em primeiro lugar, para a importância das noções de "força" e de "natureza" na obra freudiana e suas implicações para a cultura e a moral. De modo geral, apontar para a importância da Biologia no processo civilizatório, tanto à respeito das prerrogativas da espécie quanto do indivíduo. Em segundo lugar, apontar para a mudança ocorrida nessas questões com a introdução do conceito de "Eros". Privilegiamos a apresentação de dois textos para nosso propósito: o "...

  7. Viva o Rock: vivenciando saberes na musicalidade

    OpenAIRE

    Mosca, Maristela de Oliveira

    2011-01-01

    Este trabalho parte da narrativa de um Projeto Musicalizador que tem como foco a construção de um espetáculo musical na Escola de Educação Básica. Neste recorte refletimos epistemologicamente sob as luzes dos Sete Saberes Necessários à Educação do Futuro, em uma interligação com os cenários dos Quatro Pilares da Educação – aprender a conhecer, aprender a fazer, aprender a viver juntos, aprender a ser, e as concepções pedagógicas do Orff-Schulwerk. A interlocução com os Pressupostos da Corpore...

  8. O operar de um coletivo na web

    Directory of Open Access Journals (Sweden)

    Karen Eidelwein

    Full Text Available Analisamos o operar de um grupo de discussão na WEB buscando identificar seu agenciamento enquanto coletivo autoprodutivo. Estabelecemos sete indicadores de operação e cinco categorias temáticas. A visualização de cada um dos indicadores de operação em cada uma das categorias temáticas possibilitou compreender o operar do grupo como decorrente das próprias relações que foram sendo estabelecidas, em um processo autoprodutivo, de causalidade recursiva. Foi possível argumentar que o grupo apresentou indícios de um modo de instituir-se capaz de apontar para outras formas de relação em torno da construção de objetos coletivos teóricos voltados para a ação fora do espaço digital.

  9. O operar de um coletivo na WEB

    Directory of Open Access Journals (Sweden)

    Karen Eidelwein

    Full Text Available Analisamos o operar de um grupo de discussão na WEB buscando identificar seu agenciamento enquanto coletivo autoprodutivo. Estabelecemos sete indicadores de operação e cinco categorias temáticas. A visualização de cada um dos indicadores de operação em cada uma das categorias temáticas possibilitou compreender o operar do grupo como decorrente das próprias relações que foram sendo estabelecidas, em um processo autoprodutivo, de causalidade recursiva. Foi possível argumentar que o grupo apresentou indícios de um modo de instituir-se capaz de apontar para outras formas de relação em torno da construção de objetos coletivos teóricos voltados para a ação fora do espaço digital.

  10. SORPCJA CHROMU (VI NA MODYFIKOWANYCH ZEOLITACH NATURALNYCH

    Directory of Open Access Journals (Sweden)

    Paulina SOBOLEWSKA

    Full Text Available Celem badań było wyznaczenie równowagi sorpcji jonów chromu (VI z roztworów wodnych na modyfikowanych zeolitach naturalnych pochodzących z Włoch i USA. Do syntezy organo-zeolitów zastosowano HDTMA-Br w ilości dwukrotnej pojemności kationowymiennej zeolitów (2,0 ECEC. Badania przeprowadzono w warunkach nieprzepływowych przy odczynie pH równym 3,0; 4,0 i 5,0 w temperaturze pokojowej. Największą efektywność sorpcji jonów Cr(VI uzyskano dla chabazytu przy pH=4 i uziarnienia poniżej 0,25 mm, kiedy w roztworze dominowały jony wodorochromianowe HCrO4-.

  11. UTJECAJ PROMJENJIVE POSLOVNE OKOLINE NA VRSTE RIZIKA

    OpenAIRE

    Jakaša, Tina; Bratić, Diana; Iliopoulos, Fivos

    2009-01-01

    Promjene u poslovnom okruženju uvele su novi tip rizika u poduzeća elektroprivrede. Zbog toga je za poduzeća elektroprivrede vrlo važno identificirati rizike i naći korelaciju među njima, te to činiti redovito kako bi se zaštitile i povećale vrijednost kompanije. U ovom se radu predlažu sljedeće tri hipoteze: H1 Postoje promjene u tipu rizika u poduzećima elektroprivrede tijekom zadnjih 10 godina. H2 Postoji korelacija između intenziteta tržišne konkurencije i utjecaja prisutnih/postojećih ti...

  12. Na-Zn liquid metal battery

    Science.gov (United States)

    Xu, Junli; Kjos, Ole Sigmund; Osen, Karen Sende; Martinez, Ana Maria; Kongstein, Ole Edvard; Haarberg, Geir Martin

    2016-11-01

    A new kind of membrane free liquid metal battery was developed. The battery employs liquid sodium and zinc as electrodes both in liquid state, and NaCl-CaCl2 molten salts as electrolyte. The discharge flat voltage is in the range of about 1.4 V-1.8 V, and the cycle efficiency achieved is about 90% at low discharge current densities (below 40 mA cm-2). Moreover, this battery can also be charged and discharged at high current density with good performance. The discharge flat voltage is above 1.1 V when it is discharged at 100 mA cm-2, while it is about 0.8 V with 100% cycle efficiency when it is discharged at 200 mA cm-2. Compared to other reported liquid metal battery, this battery has lower cost, which suggests broad application prospect in energy storage systems for power grid.

  13. Violência na Terceira Idade

    OpenAIRE

    Vale, Soraia Domingues

    2014-01-01

    Projecto de Graduação apresentado à Universidade Fernando Pessoa como parte dos requisitos para obtenção do grau de Licenciada em Criminologia No presente projeto, cujo tema é violência sobre os idosos, irão ser definidos, no Capítulo I, conceitos como envelhecimento, violência, tipos de violência, as características das vítimas e dos agressores, fatores de risco e de prevenção e o “estado da arte” sobre o fenómeno da violência na terceira idade. No Capítulo II, são abordados os locais ...

  14. The NA49 large acceptance hadron detector

    Energy Technology Data Exchange (ETDEWEB)

    Afanasiev, S.; Alber, T.; Appelshaeuser, H.; Baechler, J.; Barna, D.; Barnby, L.S.; Bartke, J.; Barton, R.A.; Betev, L.; Bialkowska, H.; Bieser, F.; Billmeier, A.; Blyth, C.O.; Bock, R.; Bormann, C.; Bracinik, J.; Brady, F.P.; Brockmann, R.; Brun, R.; Buncic, P.; Caines, H.L.; Cebra, D.; Cooper, G.E.; Cramer, J.G.; Csato, P.; Cyprian, M.; Dunn, J.; Eckardt, V.; Eckhardt, F.; Empl, T.; Eschke, J.; Ferguson, M.I.; Fessler, H.; Fischer, H.G.; Flierl, D.; Fodor, Z.; Frankenfeld, U.; Foka, P.; Freund, P.; Friese, V.; Ftacnik, J.; Fuchs, M.; Gabler, F.; Gal, J.; Ganz, R.; Gazdzicki, M.; Gladysz, E.; Grebieszkow, J.; Guenther, J.; Harris, J.W.; Hegyi, S.; Henkel, T.; Hill, L.A.; Hlinka, V.; Huang, I.; Huemmler, H.; Igo, G.; Irmscher, D.; Ivanov, M.; Janik, R.; Jacobs, P.; Jones, P.G.; Kadija, K.; Kolesnikov, V.I.; Kowalski, M.; Lasiuk, B.; Levai, P.; Liebicher, K.; Lynen, U.; Malakhov, A.I.; Margetis, S.; Markert, C.; Marks, C.; Mayes, B.; Melkumov, G.L.; Mock, A.; Molnar, J.; Nelson, J.M.; Oldenburg, M.; Odyniec, G.; Palla, G.; Panagiotou, A.D.; Pestov, Y.; Petridis, A.; Pikna, M.; Pimpl, W.; Pinsky, L.; Piper, A.; Porter, R.J.; Poskanzer, A.M.; Poziombka, S.; Prindle, D.J.; Puehlhofer, F.; Rauch, W.; Reid, J.G.; Renfordt, R.; Retyk, W.; Ritter, H.G.; Roehrich, D.; Roland, C.; Roland, G.; Rudolph, H.; Rybicki, A.; Sammer, T.; Sandoval, A.; Sann, H.; Schaefer, E.; Schmidt, R.; Schmischke, D.; Schmitz, N.; Schoenfelder, S.; Semenov, A.Yu.; Seyboth, J.; Seyboth, P.; Seyerlein, J.; Sikler, F.; Sitar, B.; Skrzypczak, E.; Squier, G.T.A.; Stelzer, H.; Stock, R.; Strmen, P.; Stroebele, H.; Struck, C.; Susa, T.; Szarka, I.; Szentpetery, I.; Szymanski, P.; Sziklai, J.; Toy, M.; Trainor, T.A.; Trentalange, S.; Ullrich, T.; Vassiliou, M.; Veres, G.; Vesztergombi, G.; Vranic, D.; Wang, F.Q.; Weerasundara, D.D.; Wenig, S. E-mail: siegfried.wenig@cern.ch; Whitten, C.; Wieman, H.; Wienold, T.; Wood, L.; Yates, T.A.; Zimanyi, J.; Zhu, X.-Z.; Zybert, R

    1999-07-01

    The NA49 detector is a wide acceptance spectrometer for the study of hadron production in p+p, p+A, and A+A collisions at the CERN SPS. The main components are 4 large-volume TPCs for tracking and particle identification via dE/dx. TOF scintillator arrays complement particle identification. Calorimeters for transverse energy determination and triggering, a detector for centrality selection in p+A collisions, and beam definition detectors complete the set-up. A description of all detector components is given with emphasis on new technical realizations. Performance and operational experience are discussed in particular with respect to the high track density environment of central Pb+Pb collisions.

  15. LUZ, MELATONINA E ESTRESSE OXIDATIVO NA PISCICULTURA

    OpenAIRE

    2013-01-01

    Em peixes, como nos mamíferos, partes do sistema nervoso estão envolvidas em mecanismos para regulação dos sistemas corporais em sintonia com o meio. O fotoperíodo é traduzido em informações fisiológicas a partir da secreção de melatonina.Parece não haver barreiras morfofisiológicas para esta indolamina, isto é, a melatonina perfunde-se rapidamente em cada célula do organismo e em alguns casos interage com receptores e membrana situados na superfície celular, e parece estar ligada à ingestão ...

  16. O retorno do religioso na contemporaneidade

    Directory of Open Access Journals (Sweden)

    Tiago Ribeiro Nunes

    2008-12-01

    Full Text Available O presente trabalho pretende analisar os novos modos de relação, entre a civilização e o sagrado, que emergem no contexto da contemporaneidade. Partindo principalmente das formulações freudianas e lacanianas sobre o tema, nosso objetivo primordial ao longo deste artigo é estabelecer parâmetros para compreender a ocorrência do "retorno ao sagrado no exato momento em que a humanidade enfrenta crises cada vez mais profundas e permanentes. Tal empreendimento nos permitirá verificar até que ponto o fortalecimento dos movimentos religiosos pode ser considerado como uma das conseqüências da queda dos referenciais que se realiza na contemporaneidade.

  17. Bullying: ato esburacado na angústia

    Directory of Open Access Journals (Sweden)

    Maria de Lourdes Soares Ornellas

    2012-04-01

    Full Text Available A noção de afeto está no campo do (desprazer, resultante de uma experiência afetiva de satisfação ou insatisfação, e que se manifesta nas necessidades do sujeito. Pode-se dizer que o afeto envolve a ambivalência de sentimentos, do mais agradável ao mais insuportável, e desempenha um papel estruturante para que o sujeito reencontre sua estrutura psíquica, exercendo uma ação mediadora e decisiva sobre a constituição do sujeito do desejo, orientando o seu projeto de vida, sua profissão, sua opção sexual, etc. Essa ambivalência de afetos deve ser exercitada na educação familiar e escolar, na fala e na escuta que o afeto (desprazeroso tem relevância e parece ser silenciado. O desprazer pode ser escandido pelos sintomas medo, depressão, irritabilidade, ansiedade, humilhação. Assim posto o bullying é também conhecido como a síndrome da humilhação. O objetivo da humilhação é a tentativa de destruição do sujeito; a perda da identificação revela um fantasma, na medida em que própria vítima se sente culpada por sofrer ou por estar sofrendo um ato esburacado porque uma das peças não é encontrada e, em lugar do encaixe, o que se mostra é um buraco, o que provoca a angústia entre quem perde e aquele que ganha. ABSTRACT: The notion of affect is thus in the field of (dis pleasure, resulting from an affective experience of satisfaction or dissatisfaction, and that manifests itself on the needs of the subject. You could say that the affection involves the ambivalence of feelings, the more enjoyable the more unbearable, and plays a structural role for the subject to rediscover his psychic structure, exerting a mediator and decisive action on the constitution of the subject of desire, directing the its design life, your profession, your sexual orientation, etc.. This ambivalence of feelings should be exercised in family education and school, talking and listening that affect (dis pleasure is relevant and appears to be

  18. 蚕豆幼苗对NaCl和NaHCO3胁迫的生理响应%Physiological responses of Viciafaba L.seedlings under NaCl and NaHCO3 stress

    Institute of Scientific and Technical Information of China (English)

    乔枫; 罗桂花; 耿贵工

    2011-01-01

    Vicia faba L. Seedlings were treated with different concentrations of NaCl and NaHCO3 for 7 days,and the fresh weight, malondialdehyde (MDA) content, free proline content, and the activities of antioxidant enzymes were determined. The results were as follows. With the increase of NaCl and NaHCO3 concentrations, fresh weight of Vicia faba L. Seedlings first increased significantly and then declined, MDA and free proline contents increased significantly, and the increase extent under NaCl stress was lower than under NaHCO3. The activity of superoxide dismutase ( SOD) first increased significantly and then declined. The activity of peroxidase ( POD) increased significantly under NaCl stress, and first rose and then decreased significantly under NaHCO3 stress.The activity of catalase (CAT) increased significantly. In conclusion, Vicia faba L. Could resist salt and alkali stress to a certain degree. The responses of Vicia faba L. To alkali stress were more obvious than that to salt stress on average.%采用不同浓度的NaCl和NaHCO3处理蚕豆幼苗,处理7d后分别测定蚕豆幼苗鲜重、蚕豆叶片MDA和脯氨酸含量、蚕豆叶片抗氧化酶活性.结果显示,随NaCl和NaHCO3胁迫浓度的增加,蚕豆幼苗鲜重先显著增加后显著下降(P<0.05);叶中MDA和脯氨酸含量显著上升(P<0.05),NaCl低于NaHCO3的上升幅度;超氧化物歧化酶(SOD)活性先显著增加(P<0.05)然后下降;过氧化物酶(POD)活性在NaCl胁迫下显著升高(P<0.05),NaHCO3胁迫下先升高后显著降低(P<0.05);过氧化氢酶(CAT)活性显著增加(P<0.05).蚕豆具有一定程度的抗盐碱性,碱胁迫大于同浓度盐胁迫的伤害.

  19. NaCl胁迫对阿月浑子各器官Na+、K+吸收的影响%Effect of NaCl Stress on Na+ and K+ Uptakes by Different Organs of Pistachio

    Institute of Scientific and Technical Information of China (English)

    克热木·伊力; 袁琳; 马合木提·卡热

    2005-01-01

    在温室盆栽条件下,用NaCl处理新疆长果阿月浑子与美国品种Kerman,处理浓度为50、150、250和500 mmol·L-1,盐处理后5、10、20 d分别取叶、茎和根,测定各器官中Na+、K+含量及Na+/K+变化规律.研究结果表明,随着土壤盐浓度的增加,长果阿月浑子和Kerman的叶、茎和根中Na+离子含量在盐处理5、10、20 d后每个处理都表现出升高趋势;而两个品种的叶、根和茎中的K+含量在盐处理后其变化规律都不稳定.长果阿月浑子叶片、茎和根系中Na+/K+的比值在盐处理5 d和10 d都升高.Kerman的叶和根系中Na+/K+比值在处理5、10、20 d后升高;茎中Na+/K+处理10 d后升高,但20 d后没有明显变化.实验结果表明NaCl胁迫后,长果阿月浑子的叶片中Na+含量增加幅度均大于Kerman,Kerman根和茎中的Na+含量增加幅度大于长果阿月浑子;NaCl胁迫5 d和10 d后,长果阿月浑子叶片中的Na+/K+的比值高于Kerman,Kerman茎和根部中的Na+/K+的比值高于长果阿月浑子,表明了长果阿月浑子和Kerman都具有一定的耐盐性,但Kerman的耐盐性强于长果阿月浑子.由于叶片和根中Na+和Na+/K+比值的变化很稳定,可以确定为阿月浑子主要抗盐指标,茎中Na+/K+的变化规律较稳定,可以作为抗盐性参考指标.

  20. Analiza preiskovalnih metod na primeru igre Scotland Yard

    OpenAIRE

    BELEJ, NEŽA

    2015-01-01

    V diplomskem delu se seznanimo s področjem umetne inteligence, ki se ukvarja z raziskovanjem namiznih iger in iskanjem njihovih programskih rešitev. Preučimo algoritem drevesnega preiskovanja Monte-Carlo in ga poskušamo čim bolj spretno prenesti na znano namizno igro Scotland Yard, pri čemer upoštevamo nasvete Nijssena in Winandsa. Osredotočimo se predvsem na tretjo fazo algoritma, simulacijo, katero se odločimo implementirati na tri različne načine (od manj naprednih do bolj naprednih), te n...

  1. Kaolin-based geopolymers with various NaOH concentrations

    Science.gov (United States)

    Heah, C. Y.; Kamarudin, H.; Mustafa Al Bakri, A. M.; Bnhussain, M.; Luqman, M.; Khairul Nizar, I.; Ruzaidi, C. M.; Liew, Y. M.

    2013-03-01

    Kaolin geopolymers were produced by the alkali-activation of kaolin with an activator solution (a mixture of NaOH and sodium silicate solutions). The NaOH solution was prepared at a concentration of 6-14 mol/L and was mixed with the sodium silicate solution at a Na2SiO3/NaOH mass ratio of 0.24 to prepare an activator solution. The kaolin-to-activator solution mass ratio used was 0.80. This paper aimed to analyze the effect of NaOH concentration on the compressive strength of kaolin geopolymers at 80°C for 1, 2, and 3 d. Kaolin geopolymers were stable in water, and strength results showed that the kaolin binder had adequate compressive strength with 12 mol/L of NaOH concentration. When the NaOH concentration increased, the SiO2/Na2O decreased. The increased Na2O content enhanced the dissolution of kaolin as shown in X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FTIR) analyses. However, excess in this content was not beneficial for the strength development of kaolin geopolymers. In addition, there was the formation of more geopolymeric gel in 12 mol/L samples. The XRD pattern of the samples showed a higher amorphous content and a more geopolymer bonding existed as proved by FTIR analysis.

  2. Movimento fenomenologico: controversias e perspectivas na pesquisa psicologica

    National Research Council Canada - National Science Library

    Gomes de Castro, Thiago; Barbosa Gomes, William

    2011-01-01

    A repercussao do movimento fenomenologico na historia da psicologia pode ser notada pelas persistentes tentativas de transposicao do carater eidetico da fenomenologia para a analise sistematica de empiria...

  3. DISKRIMINACIJA PRI ZAPOSLOVANJU IN DELU NA PODLAGI SPOLNE USMERJENOSTI

    OpenAIRE

    Markovič, Polona

    2012-01-01

    Ustavno zagotovljena pravica do enakosti, brez kakršnegakoli razlikovanja na podlagi osebnih okoliščin, predstavlja eno izmed temeljnih človekovih pravic. Za zagotavljanje enakega obravnavanja posameznikov in različnih skupin oseb na vseh področjih družbenega življenja je neizogibno potrebna natančna zakonska opredelitev varstva pred diskriminacijo. Prepoved diskriminacije je pravno regulirana v določilih mnogih dokumentov, sprejetih na mednarodni in nacionalni ravni. Diskriminacijo lahko naj...

  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

    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.

  5. 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.

  6. Pragmatična lingvistika I kontrastivne študije

    Directory of Open Access Journals (Sweden)

    Josip Jernej

    1991-12-01

    Full Text Available Nakon teoretskog uvoda analiziraju se u članku pragmatična značenja nekih često upotrebljenih "čestica" kao što su samo, lijepo, već, inače, i to tragom temeljnje rasprave Pavla Tekavčića iz god. 1989. Dodani su i njemački prijevodi hrvatskim primjerima što su u spomenutoj raspravi prevedeni na talijanski. Članak završava napomenama koji se odnose na inače zapostavljenu kategoriju uzvika i njihova moguća pragmatična značenja.

  7. Transcriptional regulators of Na, K-ATPase subunits

    Directory of Open Access Journals (Sweden)

    Zhiqin eLi

    2015-10-01

    Full Text Available The Na,K-ATPase classically serves as an ion pump creating an electrochemical gradient across the plasma membrane that is essential for transepithelial transport, nutrient uptake and membrane potential. In addition, Na,K-ATPase also functions as a receptor, a signal transducer and a cell adhesion molecule. With such diverse roles, it is understandable that the Na,K-ATPase subunits, the catalytic alpha-subunit, the beta-subunit and the FXYD proteins, are controlled extensively during development and to accommodate physiological needs. The spatial and temporal expression of Na,K-ATPase is partially regulated at the transcriptional level. Numerous transcription factors, hormones, growth factors, lipids and extracellular stimuli modulate the transcription of the Na,K-ATPase subunits. Moreover, epigenetic mechanisms also contribute to the regulation of Na,K-ATPase expression. With the ever growing knowledge about diseases associated with the malfunction of Na,K-ATPase, this review aims at summarizing the best-characterized transcription regulators that modulate Na,K-ATPase subunit levels. As abnormal expression of Na,K-ATPase subunits have been observed in many carcinoma, we will also discuss transcription factors that are associated with epithelial-to-mesenchymal transition, a crucial step in the progression of many tumors to malignant disease.

  8. Mercury's Na Exosphere from MESSENGER Data

    Science.gov (United States)

    Killen, Rosemary M.; Burger, M. H.; Cassidy, T. A.; Sarantos, M.; Vervack, R. J.; McClintock, W. El; Merkel, A. W.; Sprague, A. L.; Solomon, S. C.

    2012-01-01

    MESSENGER entered orbit about Mercury on March 18, 2011. Since then, the Ultraviolet and Visible Spectrometer (UWS) channel of MESSENGER's Mercury Atmospheric and Surface Composition Spectrometer (MASCS) has been observing Mercury's exosphere nearly continuously. Daily measurements of Na brightness were fitted with non-uniform exospheric models. With Monte Carlo sampling we traced the trajectories of a representative number of test particles, generally one million per run per source process, until photoionization, escape from the gravitational well, or permanent sticking at the surface removed the atom from the simulation. Atoms were assumed to partially thermally accommodate on each encounter with the surface with accommodation coefficient 0.25. Runs for different assumed source processes are run separately, scaled and co-added. Once these model results were saved onto a 3D grid, we ran lines of sight from the MESSENGER spacecraft :0 infinity using the SPICE kernels and we computed brightness integrals. Note that only particles that contribute to the measurement can be constrained with our method. Atoms and molecules produced on the nightside must escape the shadow in order to scatter light if the excitation process is resonant-light scattering, as assumed here. The aggregate distribution of Na atoms fits a 1200 K gas, with a PSD distribution, along with a hotter component. Our models constrain the hot component, assumed to be impact vaporization, to be emitted with a 2500 K Maxwellian. Most orbits show a dawnside enhancement in the hot component broadly spread over the leading hemisphere. However, on some dates there is no dawn/dusk asymmetry. The portion of the hot/cold source appears to be highly variable.

  9. Mercury's Na Exosphere from MESSENGER Data

    Science.gov (United States)

    Killen, Rosemary M.; Burger, M. H.; Cassidy, T. A.; Sarantos, M.; Vervack, R. J.; McClintock, W. El; Merkel, A. W.; Sprague, A. L.; Solomon, S. C.

    2012-01-01

    MESSENGER entered orbit about Mercury on March 18, 2011. Since then, the Ultraviolet and Visible Spectrometer (UWS) channel of MESSENGER's Mercury Atmospheric and Surface Composition Spectrometer (MASCS) has been observing Mercury's exosphere nearly continuously. Daily measurements of Na brightness were fitted with non-uniform exospheric models. With Monte Carlo sampling we traced the trajectories of a representative number of test particles, generally one million per run per source process, until photoionization, escape from the gravitational well, or permanent sticking at the surface removed the atom from the simulation. Atoms were assumed to partially thermally accommodate on each encounter with the surface with accommodation coefficient 0.25. Runs for different assumed source processes are run separately, scaled and co-added. Once these model results were saved onto a 3D grid, we ran lines of sight from the MESSENGER spacecraft :0 infinity using the SPICE kernels and we computed brightness integrals. Note that only particles that contribute to the measurement can be constrained with our method. Atoms and molecules produced on the nightside must escape the shadow in order to scatter light if the excitation process is resonant-light scattering, as assumed here. The aggregate distribution of Na atoms fits a 1200 K gas, with a PSD distribution, along with a hotter component. Our models constrain the hot component, assumed to be impact vaporization, to be emitted with a 2500 K Maxwellian. Most orbits show a dawnside enhancement in the hot component broadly spread over the leading hemisphere. However, on some dates there is no dawn/dusk asymmetry. The portion of the hot/cold source appears to be highly variable.

  10. LUZ, MELATONINA E ESTRESSE OXIDATIVO NA PISCICULTURA

    Directory of Open Access Journals (Sweden)

    Claudio Alberto Gellis de Mattos Dias

    2013-12-01

    Full Text Available Em peixes, como nos mamíferos, partes do sistema nervoso estão envolvidas em mecanismos para regulação dos sistemas corporais em sintonia com o meio. O fotoperíodo é traduzido em informações fisiológicas a partir da secreção de melatonina.Parece não haver barreiras morfofisiológicas para esta indolamina, isto é, a melatonina perfunde-se rapidamente em cada célula do organismo e em alguns casos interage com receptores e membrana situados na superfície celular, e parece estar ligada à ingestão de alimentos, crescimento e atividade locomotora de peixes. São moléculas importantes metabolizando espécies reativas de oxigênio a produtos inativos e, portanto, reduzindo o dano oxidativo.Este trabalho tem por objetivo fazer um breve levantamento em artigos recentes sobre luminosidade, melatonina e o estresse oxidativo em peixes, e correlaciona-los com piscicultura. Concluímos que a luminosidade parece estar ligada a produção de melatonina, e esta molécula antioxidante, que favorece a redução do estresse oxidativo, parecem melhorar o desempenho na produção de peixes em criadouros. Palavras-chave: Melatonina, estresse oxidativo, piscicultura. DOI: http://dx.doi.org/10.18561/2179-5746/biotaamazonia.v3n3p169-176

  11. Scintillation Efficiency Measurement of Na Recoils in NaI(Tl) Below the DAMA/LIBRA Energy Threshold

    Energy Technology Data Exchange (ETDEWEB)

    Xu, Jingke [Princeton U.; Shields, Emily [Princeton U.; Calaprice, Frank [Princeton U.; Westerdale, Shawn [Princeton U.; Froborg, Francis [Princeton U.; Suerfu, Burkhant [Princeton U.; Alexander, Thomas [Fermilab; Aprahamian, Ani [Notre Dame U.; Back, Henning O. [Princeton U.; Casarella, Clark [Notre Dame U.; Fang, Xiao [Notre Dame U.; Gupta, Yogesh K. [Notre Dame U.; Ianni, Aldo [Gran Sasso; Lamere, Edward [Notre Dame U.; Lippincott, W. Hugh [Fermilab; Liu, Qian [Notre Dame U.; Lyons, Stephanie [Notre Dame U.; Siegl, Kevin [Notre Dame U.; Smith, Mallory [Notre Dame U.; Tan, Wanpeng [Notre Dame U.; Kolk, Bryant Vande [Notre Dame U.

    2015-07-30

    The dark matter interpretation of the DAMA modulation signal depends on the NaI(Tl) scintillation efficiency of nuclear recoils. Previous measurements for Na recoils have large discrepancies, especially in the DAMA/LIBRA modulation energy region. We report a quenching effect measurement of Na recoils in NaI(Tl) from 3 to 52 keVnr, covering the whole DAMA/LIBRA energy region for dark matter-Na scattering interpretations. By using a low-energy, pulsed neutron beam, a double time-of-flight technique, and pulse-shape discrimination methods, we obtained the most accurate measurement of this kind for NaI(Tl) to date. The results differ significantly from the DAMA reported values at low energies but fall between the other previous measurements. We present the implications of the new quenching results for the dark matter interpretation of the DAMA modulation signal.

  12. Growth mechanism of NaClO3 and NaBrO3 crystals from aqueous solutions

    Indian Academy of Sciences (India)

    V Surender; N Arundhathi; K Kishan Rao

    2006-10-01

    A study of growth rates of NaClO3 and NaBrO3 has been carried out using a small growth cell by in situ observation. Normal growth rates of {100} faces of NaClO3 and {111} faces of NaBrO3 along $\\langle 110 \\rangle$ direction are measured under relatively high supersaturation ranging from 3–8%. In the initial stages of growth, {100}, {110} and {111} faces develop in NaClO3 and gradually all the faces are replaced by the {100} faces only. In the case of NaBrO3, mostly {111} faces develop with occasional occurrence of small {100} faces at the intersection of {111} faces. The growth mechanisms are investigated from growth rate vs supersaturation plots and from the observations of surface features. In the present supersaturation range, the growth mechanism appears to be due to two-dimensional growth mechanism.

  13. Na/K Pump and Beyond: Na/K-ATPase as a Modulator of Apoptosis and Autophagy

    Directory of Open Access Journals (Sweden)

    Cassiano Felippe Gonçalves-de-Albuquerque

    2017-04-01

    Full Text Available Lung cancer is a leading cause of global cancer deaths. Na/K-ATPase has been studied as a target for cancer treatment. Cardiotonic steroids (CS trigger intracellular signalling upon binding to Na/K-ATPase. Normal lung and tumour cells frequently express different pump isoforms. Thus, Na/K-ATPase is a powerful target for lung cancer treatment. Drugs targeting Na/K-ATPase may induce apoptosis and autophagy in transformed cells. We argue that Na/K-ATPase has a role as a potential target in chemotherapy in lung cancer treatment. We discuss the effects of Na/K-ATPase ligands and molecular pathways inducing deleterious effects on lung cancer cells, especially those leading to apoptosis and autophagy.

  14. Na/K Pump and Beyond: Na/K-ATPase as a Modulator of Apoptosis and Autophagy.

    Science.gov (United States)

    Felippe Gonçalves-de-Albuquerque, Cassiano; Ribeiro Silva, Adriana; Ignácio da Silva, Camila; Caire Castro-Faria-Neto, Hugo; Burth, Patrícia

    2017-04-21

    Lung cancer is a leading cause of global cancer deaths. Na/K-ATPase has been studied as a target for cancer treatment. Cardiotonic steroids (CS) trigger intracellular signalling upon binding to Na/K-ATPase. Normal lung and tumour cells frequently express different pump isoforms. Thus, Na/K-ATPase is a powerful target for lung cancer treatment. Drugs targeting Na/K-ATPase may induce apoptosis and autophagy in transformed cells. We argue that Na/K-ATPase has a role as a potential target in chemotherapy in lung cancer treatment. We discuss the effects of Na/K-ATPase ligands and molecular pathways inducing deleterious effects on lung cancer cells, especially those leading to apoptosis and autophagy.

  15. Didaktična računalniška igra na temo osnov matematične logike

    OpenAIRE

    Zupančič, Katja

    2015-01-01

    V magistrskem delu Didaktična računalniška igra na temo osnov matematične logike smo predstavili nekaj osnovnih opredelitev pojma igra ter teorijo računalniških iger in izobraževalnih računalniških iger. Pregledali smo učne načrte (splošni učni načrt za matematiko, učni načrt za izbirna predmeta logika in matematična delavnica) in učbenike za osnovno šolo, kjer se pojavljajo teme osnov matematične logike, ter glavne učne cilje tekmovanja iz logike, ki ga organizira Zveza za tehnično kulturo S...

  16. Orbital-free molecular dynamics simulations of melting in $Na_{8}$ and $Na_{20} melting in steps

    CERN Document Server

    Aguado, A; Alonso, J A; Stott, M J; Aguado, Andres; Lopez, Jose M.; Alonso, Julio A.; Stott, Malcolm J.

    1999-01-01

    The melting-like transitions of Na8 and Na20 are investigated by extensive ab initio constant energy molecular dynamics simulations, using a variant of the Car-Parrinello method which employs an explicit electronic kinetic energy functional of the density, thus avoiding the use of one-particle orbitals. Several melting indicators are evaluated in order to determine the nature of the different transitions, and comparison with other theoretical calculations is made. Both Na8 and Na20 melt over a wide range of temperature. For Na8, a first transition is observed at approx. 110 K, between a rigid phase and a phase involving isomerization between the different permutational isomers of the ground state structure. The ``liquid'' phase is completely established at approx. 220 K. For Na20, three successive transitions are observed: the first phase transition, at approx. 110 K, is associated with isomerization transitions between those permutational isomers of the ground state structure which are obtained by interchang...

  17. Decomposition reactions for NaAl H4 , Na3 Al H6 , and NaH: First-principles study

    Science.gov (United States)

    Ke, Xuezhi; Tanaka, Isao

    2005-01-01

    The electronic properties and lattice dynamics of the sodium alanate phases have been studied by the density functional calculations. The phases include NaAlH4 (space group, I41/a ), Na3AlH6 (space group, P21/n ), and NaH (space group, Fm-3m ). The electronic properties are discussed on the basis of the electronic band structures, the atomic charges, the bond overlap population analysis, and the Born effective charges. The phonon dispersion relations and phonon density of states (DOS) of the phases are calculated by a direct force-constant method. Within the quasiharmonic approximation, the calculated thermodynamic functions including the heat capacity, the vibrational enthalpy, and the vibrational entropy are in good agreement with experimental values. Three decomposition reactions are studied based on the thermodynamic functions. The reactions are (1) NaAlH4→(1)/(3)Na3AlH6+(2)/(3)Al+H2 , (2) (1)/(3)Na3AlH6→NaH+(1)/(3)Al+(1)/(2)H2 , and (3) NaH→Na+(1)/(2)H2 . The reactions (1), (2), and (3) are predicted to take place at 285, 390, and 726K , respectively, which are in good agreement with the experiment (353, 423, and 698K , respectively). The individual contributions to the reactions including the enthalpy and entropy are investigated. We found that the enthalpy for the reaction is almost constant, and the net entropy contribution ( TΔS ) to the reaction is approximately equal to the entropy contribution of the H2 gas molecule (produced in that reaction).

  18. An Inactivation Stabilizer of the Na+ Channel Acts as an Opportunistic Pore Blocker Modulated by External Na+

    OpenAIRE

    Yang, Ya-Chin; Kuo, Chung-Chin

    2005-01-01

    The Na+ channel is the primary target of anticonvulsants carbamazepine, phenytoin, and lamotrigine. These drugs modify Na+ channel gating as they have much higher binding affinity to the inactivated state than to the resting state of the channel. It has been proposed that these drugs bind to the Na+ channel pore with a common diphenyl structural motif. Diclofenac is a widely prescribed anti-inflammatory agent that has a similar diphenyl motif in its structure. In this study, we found that dic...

  19. Determinants of Substrate and Cation Transport in the Human Na+/Dicarboxylate Cotransporter NaDC3*

    OpenAIRE

    Schlessinger, A; Sun, NN; Colas, C; Pajor, AM

    2014-01-01

    Metabolic intermediates, such as succinate and citrate, regulate important processes ranging from energy metabolism to fatty acid synthesis. Cytosolic concentrations of these metabolites are controlled, in part, by members of the SLC13 gene family. The molecular mechanism underlying Na+-coupled di- and tricarboxylate transport by this family is understood poorly. The human Na+/dicarboxylate cotransporter NaDC3 (SLC13A3) is found in various tissues, including the kidney, liver, and brain. In a...

  20. Impacto da perda de peso nas adipocitocinas, na proteína C-reativa e na sensibilidade à insulina em mulheres hipertensas com obesidade central

    OpenAIRE

    2007-01-01

    OBJETIVO: Avaliar o impacto do tratamento da obesidade nas adipocitocinas, na proteína C-reativa (PCR) e na sensibilidade à insulina em pacientes hipertensas com obesidade central. MÉTODOS: O estudo foi realizado a partir do banco de dados e de amostras estocadas de soro de pacientes submetidas previamente a um estudo para tratamento de obesidade. Foram selecionadas 30 mulheres hipertensas, com idade entre 18 e 65 anos, índice de massa corpórea (IMC) > 27 kg/m², com distribuição central ...