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Sample records for ne na mg

  1. Investigating the astrophysical 22Ne(p, γ23Na and 22Mg(p, γ23Al reactions with a multi-channel scattering formalism

    Directory of Open Access Journals (Sweden)

    Fraser P. R.

    2014-03-01

    Full Text Available The reaction 22Ne(p, γ23Na is key to the NeNa cycle of stellar nucleogenesis, and better understanding of the 22Mg(p, γ23Al reaction is needed to understand the 22Na puzzle in ONe white dwarf novae. We aim to study these reactions using a multi-channel algebraic scattering (MCAS formalism for low-energy nucleon-nucleus scattering, recently expanded to investigate radiative capture. As a first step towards this goal, we here calculate the energy levels of the mass-23 (Ne, Mg, Na, Al nuclei. This is not only because the resonant structure of these nuclei are related to the astrophysical -rates of interest, but also because the interaction parameters determined for describing the energy levels are an integral part of the future calculation of the astrophysical reactions when using the MCAS scheme.

  2. TheoSSA - Model WD Spectra on Demand: The Impact of Ne, Na, Mg, and Iron-group Elements on the Balmer Lines

    Science.gov (United States)

    Reindl, N.; Rauch, T.

    2015-06-01

    The registered German Astrophysical Virtual Observatory (GAVO) service TheoSSA provides easy access to synthetic stellar spectra. This GAVO database contains already ten thousands of these, which were calculated with different chemical compositions of the elements H to Ni. In addition to the database, it is possible to calculate individual spectra for hot, compact stars based on the Tübingen NLTE Model-Atmosphere Package (TMAP) via the TMAW service. The TMAW models were, in the pilot phase, restricted to the elements H, He, C, N, and O. Now, TMAW is extended to additionally consider opacities from Ne, Na, and Mg. Soon, TMAW will also be able to include the opacities from the so-called iron-group elements (Ca - Ni). We describe the improvements and show the impact of Ne, Na, Mg, and iron-group elements on the Balmer lines.

  3. β-delayed γ decay of 20Mg and the 19Ne(p , γ) 20 Na breakout reaction in Type I X-ray bursts

    Science.gov (United States)

    Glassman, B. E.; Pérez-Loureiro, D.; Wrede, C.; Allen, J.; Bardayan, D. W.; Bennett, M. B.; Brown, B. A.; Chipps, K. A.; Febbraro, M.; Friedman, M.; Fry, C.; Hall, M. R.; Hall, O.; Liddick, S. N.; O'Malley, P.; Ong, W. J.; Pain, S. D.; Prokop, C.; Schwartz, S. B.; Shidling, P.; Sims, H.; Thompson, P.; Zhang, H.

    2018-03-01

    Certain astrophysical environments such as thermonuclear outbursts on accreting neutron stars (Type-I X-ray bursts) are hot enough to allow for breakout from the Hot CNO hydrogen burning cycles to the rapid proton capture (rp) process. An important breakout reaction sequence is 15O(α,γ)19Ne(p,γ)20Na and the 19Ne(p,γ)20Na reaction rate is expected to be dominated by a single resonance at 457 keV above the proton threshold in 20Na. The resonance strength and, hence, reaction rate depends strongly on whether this 20Na state at an excitation energy of 2647 keV has spin and parity of 1+ or 3+. Previous 20Mg (Jπ =0+) β+ decay experiments have relied almost entirely on searches for β-delayed proton emission from this resonance in 20Na to limit the log ft value and, hence, Jπ. However there is a non-negligible γ-ray branch expected that must also be limited experimentally to determine the log ft value and constrain Jπ. We have measured the β-delayed γ decay of 20Mg to complement previous β-delayed proton decay work and provide the first complete limit based on all energetically allowed decay channels through the 2647 keV state. Our limit confirms that a 1+ assignment for this state is highly unlikely.

  4. Production of the Ne Auger electrons by Ne/sup +/ bombardment of Mg and Al surfaces

    Energy Technology Data Exchange (ETDEWEB)

    Ferrante, J; Pepper, S V [National Aeronautics and Space Administration, Cleveland, Ohio (USA). Lewis Research Center

    1976-07-01

    The authors have bombarded Mg and Al surfaces with Ne/sup +/ ions and in this letter present evidence for the production of an inner shell vacancy in the Ne by the asymmetric Ne-Mg and Ne-Al collision. In addition, autoionization states of neutral Ne have been observed. These states are to be distinguished from the more usual case in Auger electron spectroscopy of de-excitation of an ion with a core vacancy.

  5. Ferromagnetism in 4H-GaN polytype doped by non-magnetic light elements Li, Be, B, C, O, F, Ne, Na, and Mg: Ab-initio study

    International Nuclear Information System (INIS)

    Torrichi, M.; Ferhat, M.; Bouhafs, B.

    2016-01-01

    Using density-functional theory within the generalized-gradient approximation, we explore the magnetic behavior induced by nonmagnetic impurity X atoms, such as Li, Be, B, C, O, F, Ne, Na, and Mg on cation site in 4H-GaN polytype. The results reveal that Ne doped 4H-GaN has the highest magnetic moment of 3µ B , whereas Mg doped 4H-GaN has the lowest magnetic moment of 0.75µ B . Among the systems studied 4H-GaN doped Ne has been found to be half-metallic, whereas 4H-GaN doped F and Na are found to be nearly half-metallic. The partial density of states evidence that magnetism is achieved through a p-p like coupling between the impurity and the host 2p states. Furthermore, we inspect whether there exists a relationship between the spin-polarization and the local structure around the doping X atoms. It is found that for all the compounds studied, the total magnetic moment increases with increasing the X–N bond lengths. Interestingly, 4H-GaN:Be becomes ferromagnetic with increasing the Be–N bond length, whereas 4H-GaN:Na and 4H-GaN:F become half-metallic with increasing Na–N and F–N bond lengths. - Highlights: • The partial densities of states of 4H-GaN polytype doped light nonmagnetic elements have been investigated. • We found that 4H-GaN:Ne is half metallic. • We found that N atoms induced strong local magnetic. • We found that doping with half-filled X-s impurity states promotes ferromagnetism. • We found that doping with full-filled X-s impurity annihilates ferromagnetism.

  6. {beta}-Delayed proton-decay study of {sup 20}Mg and its implications for the {sup 19}Ne(p,{gamma}){sup 20}Na breakout reaction in X-ray bursts

    Energy Technology Data Exchange (ETDEWEB)

    Wallace, J.P., E-mail: J.P.Wallace@sms.ed.ac.uk [University of Edinburgh, Edinburgh, EH9 3JZ (United Kingdom); Woods, P.J.; Lotay, G. [University of Edinburgh, Edinburgh, EH9 3JZ (United Kingdom); Alharbi, A.; Banu, A. [Cyclotron Institute, Texas A and M University, College Station, TX (United States); David, H.M.; Davinson, T. [University of Edinburgh, Edinburgh, EH9 3JZ (United Kingdom); McCleskey, M.; Roeder, B.T.; Simmons, E.; Spiridon, A.; Trache, L.; Tribble, R.E. [Cyclotron Institute, Texas A and M University, College Station, TX (United States)

    2012-05-30

    Under astrophysical conditions of high temperature and density, such as for example found in X-ray bursts, breakout can occur from the hot CNO cycles into the rapid proton capture process. A key breakout route is via the sequence {sup 15}O({alpha},{gamma}){sup 19}Ne(p,{gamma}){sup 20}Na. The {sup 19}Ne(p,{gamma}){sup 20}Na reaction rate is expected to be dominated by a single resonance at 457(3) keV. The identity of the resonance has been under discussion for a long time, with J{sup {pi}}=1{sup +} and 3{sup +} assignments suggested. In this study of the {beta}-delayed proton decay of {sup 20}Mg we report a new, significantly more stringent, upper limit on the {beta}-decay branch to this state of 0.02% with a confidence level of 90%. This makes a 1{sup +} assignment highly unlikely and favours a 3{sup +} assignment for which no branch is expected to be observed. The 3{sup +} state is predicted to have a significantly higher resonance strength, and to produce a proportionately higher {sup 19}Ne(p,{gamma}){sup 20}Na reaction rate in X-ray burst conditions.

  7. Relativistic multireference many-body perturbation theory calculations on F-, Ne-, Na-, Mg-, Al-, Si- and P-like xenon ions

    International Nuclear Information System (INIS)

    Vilkas, Marius J; Ishikawa, Yasuyuki; Traebert, Elmar

    2006-01-01

    Many-body perturbation theory (MBPT) has been employed to calculate with high wavelength accuracy the extreme ultraviolet (EUV) spectra of F-like to P-like Xe ions. We discuss the reliability of the new calculations using the example of EUV beam-foil spectra of Xe, in which n = 3, Δn = 0 transitions of Na-, Mg-, Al- and Si-like ions have been found to dominate. A further comparison is made with spectra from an electron beam ion trap, that is, from a device with a very different (low density) excitation balance

  8. MODELS FOR METAL-POOR STARS WITH ENHANCED ABUNDANCES OF C, N, O, Ne, Na, Mg, Si, S, Ca, AND Ti, IN TURN, AT CONSTANT HELIUM AND IRON ABUNDANCES

    Energy Technology Data Exchange (ETDEWEB)

    VandenBerg, Don A.; Dotter, Aaron [Department of Physics and Astronomy, University of Victoria, P.O. Box 3055, Victoria, B.C. V8W 3P6 (Canada); Bergbusch, Peter A. [Department of Physics, University of Regina, Regina, Saskatchewan S4S 0A2 (Canada); Ferguson, Jason W. [Department of Physics, Wichita State University, Wichita, KS 67260-0032 (United States); Michaud, Georges; Richer, Jacques [Departement de Physique, Universite de Montreal, Montreal, Quebec H3C 3J7 (Canada); Proffitt, Charles R., E-mail: vandenbe@uvic.ca, E-mail: Aaron.Dotter@gmail.com, E-mail: pbergbusch@accesscomm.ca, E-mail: proffitt@stsci.edu, E-mail: Jason.Ferguson@wichita.edu, E-mail: michaudg@astro.umontreal.ca, E-mail: jacques.richer@umontreal.ca [Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218 (United States)

    2012-08-10

    Recent work has shown that most globular clusters have at least two chemically distinct components, as well as cluster-to-cluster differences in the mean [O/Fe], [Mg/Fe], and [Si/Fe] ratios at similar [Fe/H] values. In order to investigate the implications of variations in the abundances of these and other metals for H-R diagrams and predicted ages, grids of evolutionary sequences have been computed for scaled solar and enhanced {alpha}-element metal abundances, and for mixtures in which the assumed [m/Fe] value for each of the metals C, N, O, Ne, Na, Mg, Si, S, Ca, and Ti has been increased, in turn, by 0.4 dex at constant [Fe/H]. These tracks, together with isochrones for ages from Almost-Equal-To 5 to 14 Gyr, have been computed for -3.0 {<=} [Fe/H] {<=}-0.6, with helium abundances Y = 0.25, 0.29, and 0.33 at each [Fe/H] value, using upgraded versions of the Victoria stellar structure program and the Regina interpolation code, respectively. Turnoff luminosity versus age relations from isochrones are found to depend almost entirely on the importance of the CNO cycle, and thereby mainly on the abundance of oxygen. Since C, N, and O, as well as Ne and S, do not contribute significantly to the opacities at low temperatures and densities, variations in their abundances do not impact the predicted T{sub eff} scale of red giants. The latter is a strong function of the abundances of only Mg and Si (and Fe, possibly to a lesser extent) because they are so abundant and because they are strong sources of opacity at low temperatures. For these reasons, Mg and Si also have important effects on the temperatures of main-sequence stars. Due to their low abundances, Na, Ca, and Ti are of little consequence for stellar models. The effects of varying the adopted solar metals mixture and the helium abundance at a fixed [Fe/H] are also briefly discussed.

  9. Stellar reaction rate for 22Mg+p→23Al from the asymptotic normalization coefficient in the mirror nuclear system 22Ne+n→23Ne

    International Nuclear Information System (INIS)

    Al-Abdullah, T.; Carstoiu, F.; Chen, X.; Clark, H. L.; Fu, C.; Gagliardi, C. A.; Lui, Y.-W.; Mukhamedzhanov, A.; Tabacaru, G.; Tokimoto, Y.; Trache, L.; Tribble, R. E.

    2010-01-01

    The production of 22 Na in ONe novae can be influenced by the 22 Mg(p,γ) 23 Al reaction. To investigate this reaction rate at stellar energies, we have determined the asymptotic normalization coefficient (ANC) for 22 Mg+p→ 23 Al through measurements of the ANCs in the mirror nuclear system 22 Ne+n→ 23 Ne. The peripheral neutron-transfer reactions 13 C( 12 C, 13 C) 12 C and 13 C( 22 Ne, 23 Ne) 12 C were studied. The identical entrance and exit channels of the first reaction make it possible to extract independently the ground-state ANC in 13 C. Our experiment gives C p 1/2 2 ( 13 C)=2.24±0.11 fm -1 , which agrees with the value obtained from several previous measurements. The weighted average for all the obtained C p 1/2 2 is 2.31±0.08 fm -1 . This value is adopted to be used in obtaining the ANCs in 23 Ne. The differential cross sections for the reaction 13 C( 22 Ne, 23 Ne) 12 C leading to the J π =5/2 + and 1/2 + states in 23 Ne have been measured at 12 MeV/u. Optical model parameters for use in the DWBA calculations were obtained from measurements of the elastic scatterings 22 Ne+ 13 C and 22 Ne+ 12 C. The extracted ANC for the ground state in 23 Ne, C d 5/2 2 =0.86±0.08±0.12 fm -1 , is converted to its corresponding value in 23 Al using mirror symmetry to give C d 5/2 2 ( 23 Al)=(4.63±0.77)x10 3 fm -1 . The astrophysical S factor S(0) for the 22 Mg(p,γ) reaction was determined to be 0.96±0.11 keV b. The consequences for nuclear astrophysics are discussed.

  10. Excitation of Li and Na atoms in collisions with He and Ne

    International Nuclear Information System (INIS)

    Olsen, J.Oe.; Andersen, T.; Andersen, N.

    1977-01-01

    Total emission cross sections and polarizations have been measured for the 2 2 S - 2 2 P, 2 2 P - 3 2 D and 2 2 P - 3 2 S LiI multiplets in Li - He,Ne collisions, and the 3 2 S - 3 2 P and 3 2 P - 3 2 D NaI multiplets in Na - He,Ne collisions in the 0.6 - 60 keV energy range. The excitation of the alkali resonance multiplet is found to be the dominant inelastic process for all four collision systems. The behaviour is very similar to the previously investigated Be + - He,Ne and Mg + - He,Ne systems. The results are compared with recent calculations by Manique et al based on a quasi-one electron description using various model potentials. Good agreement is found for Li - He with a simple Hartree-Fock frozen-core potential. The agreement is fair for Li,Na - He calculations with a Baylis type potential but poor for calculations based on Bottcher model potentials. For Ne as target all three potentials by far overestimate the size of the cross section. (Auth.)

  11. Spectroscopy of {sup 18}Na: Bridging the two-proton radioactivity of {sup 19}Mg

    Energy Technology Data Exchange (ETDEWEB)

    Assie, M. [GANIL, CEA/DSM-CNRS/IN2P3, Caen (France); Institut de Physique Nucleaire, Universite Paris-Sud-11-CNRS/IN2P3, 91406 Orsay (France); Oliveira Santos, F. de, E-mail: oliveira@ganil.fr [GANIL, CEA/DSM-CNRS/IN2P3, Caen (France); Davinson, T. [SUPA School of Physics and Astronomy, The University of Edinburgh, Edinburgh EH9 3JZ (United Kingdom); Grancey, F. de [GANIL, CEA/DSM-CNRS/IN2P3, Caen (France); Achouri, L. [LPC/ENSICAEN, Blvd du Marechal Juin, 14050 Caen Cedex (France); Alcantara-Nunez, J. [Departamento de Fisica de Particulas, Universidade de Santiago de Compostela, E15782 (Spain); Al Kalanee, T.; Angelique, J.-C. [LPC/ENSICAEN, Blvd du Marechal Juin, 14050 Caen Cedex (France); Borcea, C.; Borcea, R. [Horia Hulubei National Institute for Physics and Nuclear Engineering, P.O. Box MG-6, 76900 Bucharest (Romania); Caceres, L. [GANIL, CEA/DSM-CNRS/IN2P3, Caen (France); Celikovic, I. [VINCA Institute of Nuclear Sciences, University of Belgrade, P.O. Box 522, 11001 Belgrade (Serbia); Chudoba, V. [Flerov Laboratory of Nuclear Reactions, JINR RU-141980 Dubna (Russian Federation); Institute of Physics, Silesian University in Opava, Bezrucovo nam. 13, 746 01 Opava (Czech Republic); Pang, D.Y. [GANIL, CEA/DSM-CNRS/IN2P3, Caen (France); Ducoin, C. [INFN - Sezione di Catania, Via S. Sofia 64, Catania 95123 (Italy); Fallot, M. [Subatech 4 rue Alfred Kastler, BP 20722, F-44307 Nantes Cedex 3 (France); Kamalou, O. [GANIL, CEA/DSM-CNRS/IN2P3, Caen (France); Kiener, J. [CSNSM, Universite Paris-Sud-11, CNRS/IN2P3, 91405 Orsay-Campus (France); Lam, Y. [CENBG CNRS/IN2P3 - Universite Bordeaux 1, Le Haut Vigneau, 33175 Gradignan cedex (France); and others

    2012-06-06

    The unbound nucleus {sup 18}Na, the intermediate nucleus in the two-proton radioactivity of {sup 19}Mg, was studied by the measurement of the resonant elastic scattering reaction H({sup 17}Ne,p){sup 17}Ne performed at 4 A.MeV using a radioactive beam from the SPIRAL Facility. Spectroscopic properties of the low-lying states were obtained in an R-matrix analysis of the excitation function.

  12. Spectroscopy of Na-18: Bridging the two-proton radioactivity of Mg-19

    Czech Academy of Sciences Publication Activity Database

    Assie, M.; de Oliveira Santos, F.; Achouri, L.; Angelique, J. C.; Borcea, C.; Borcea, R.; Caceres, L.; Chudoba, V.; Pang, D. Y.; Ducoin, D.; Fallot, M.; Kamalou, O.; Kiener, J.; Lam, Y.; Lefevre, A.; Lotay, G.; Mrázek, Jaromír; Perrot, L.; Sánchez, A.; Rotaru, F.

    2012-01-01

    Roč. 712, č. 3 (2012), s. 198-202 ISSN 0370-2693 Grant - others:European Commission(XE) RII3-CT-2004-506065 Institutional support: RVO:61389005 Keywords : two-proton radioactivity * resonant elastic scattering * (19)mg * Na-18 * Ne-17 Subject RIV: BG - Nuclear, Atomic and Molecular Physics, Colliders Impact factor: 4.569, year: 2012

  13. Constraints on the ^22Ne(α,n)^25Mg reaction rate from ^natMg+n Total and ^25Mg(n,γ ) Cross Sections

    Science.gov (United States)

    Koehler, Paul

    2002-10-01

    The ^22Ne(α,n)^25Mg reaction is the neutron source during the s process in massive and intermediate mass stars as well as a secondary neutron source during the s process in low mass stars. Therefore, an accurate determination of this rate is important for a better understanding of the origin of nuclides heavier than iron as well as for improving s-process models. Also, because the s process produces seed nuclides for a later p process in massive stars, an accurate value for this rate is important for a better understanding of the p process. Because the lowest observed resonance in direct ^22Ne(α,n)^25Mg measurements is considerably above the most important energy range for s-process temperatures, the uncertainty in this rate is dominated by the poorly known properties of states in ^26Mg between this resonance and threshold. Neutron measurements can observe these states with much better sensitivity and determine their parameters much more accurately than direct ^22Ne(α,n)^25Mg measurements. I have analyzed previously reported Mg+n total and ^25Mg(n,γ ) cross sections to obtain a much improved set of resonance parameters for states in ^26Mg in this region, and an improved estimate of the uncertainty in the ^22Ne(α,n)^25Mg reaction rate. This work was supported by the U.S. DOE under contract No. DE-AC05-00OR22725 with UT-Battell, LLC.

  14. Resonant proton scattering of $^{22}$Mg and $^{21}$Na

    CERN Multimedia

    Di julio, D D; Jansson, K; Rudolph, D; Fynbo, H O U; Nilsson, T; Perea martinez, A

    In our letter-of-intent, INTC-I-051, we discussed the physics case for scattering and transfer reactions involving light nuclei in the break-out region of the rp-process. The Committee found the physics case compelling and supported the letter-of-intent under the premise that beams of proper quality were developed and that an adequate detector set-up was presented. As these two requirements have been met recently we now propose to study resonant proton scattering of $^{22}$Mg to identify the states at 1.733 MeV and 2.575 MeV in $^{23}$Al that have been reported from the $^{24}$Mg($^{7}$Li,$^{8}$He)$\\,^{23}\\!$Al reaction but that remained unobserved in the only resonant proton scattering experiment performed with $^{22}$Mg so far. In particular we should be able to investigate the character of the proton emission of the 2.575 MeV state which may also have a significant inelastic branch. We also propose to perform resonant proton scattering on $^{21}$Na above $\\alpha$-particle threshold with $^{18}$Ne to study ...

  15. Study of atomic excitations in sputtering with the use of N, O, F, Ne, Na, Cl, and Ar projectiles

    International Nuclear Information System (INIS)

    Jensen, H.K.; Veje, E.

    1985-01-01

    Solid magnesium has been bombarded with 80 keV ions of N, O, F, Ne, Na, Cl, and Ar, and excitation of sputtered magnesium atoms and ions has been studied. Relative level excitation probabilities depend strongly on the projectile, the dependences for Mg I levels being different from those for Mg II levels. With all projectiles, the resonance level in Mg II is excited stronger than the resonance level in Mg I. Very little radiation is observed from the projectiles except for sodium. The results are discussed. (orig.)

  16. Coulomb excitation of radioactive Na21 and its stable mirror Ne21

    Science.gov (United States)

    Schumaker, M. A.; Cline, D.; Hackman, G.; Morton, A. C.; Pearson, C. J.; Svensson, C. E.; Wu, C. Y.; Andreyev, A.; Austin, R. A. E.; Ball, G. C.; Bandyopadhyay, D.; Becker, J. A.; Boston, A. J.; Boston, H. C.; Buchmann, L.; Churchman, R.; Cifarelli, F.; Cooper, R. J.; Cross, D. S.; Dashdorj, D.; Demand, G. A.; Dimmock, M. R.; Drake, T. E.; Finlay, P.; Gallant, A. T.; Garrett, P. E.; Green, K. L.; Grint, A. N.; Grinyer, G. F.; Harkness, L. J.; Hayes, A. B.; Kanungo, R.; Leach, K. G.; Lee, G.; Maharaj, R.; Martin, J.-P.; Moisan, F.; Mythili, S.; Nelson, L.; Newman, O.; Nolan, P. J.; Orce, J. N.; Padilla-Rodal, E.; Phillips, A. A.; Porter-Peden, M.; Ressler, J. J.; Roy, R.; Ruiz, C.; Sarazin, F.; Scraggs, D. P.; Waddington, J. C.; Wan, J. M.; Whitbeck, A.; Williams, S. J.; Wong, J.

    2008-10-01

    The low-energy structures of the mirror nuclei Ne21 and radioactive Na21 have been examined by using Coulomb excitation at the TRIUMF-ISAC radioactive ion beam facility. Beams of ~5×106 ions/s were accelerated to 1.7 MeV/A and Coulomb excited in a 0.5 mg/cm2 natTi target. Scattered beam and target particles were detected by the segmented Si detector BAMBINO, while γ rays were observed by using two TIGRESS HPGe clover detectors perpendicular to the beam axis. For each isobar, Coulomb excitation from the (3)/(2)+ ground state to the first excited (5)/(2)+ state was observed and B(E2) values were determined by using the 2+→0+ de-excitation in Ti48 as a reference. The ϕ segmentation of BAMBINO was used to deduce tentative assignments for the signs of the mixing ratios between the E2 and M1 components of the transitions. The resulting B(E2)↑ values are 131±9e2 fm4 (25.4±1.7 W.u.) for Ne21 and 205±14e2 fm4 (39.7±2.7 W.u.) for Na21. The fit to the present data and the known lifetimes determined E2/M1 mixing ratios and B(M1)↓ values of δ=(-)0.0767±0.0027 and 0.1274±0.0025μN2 and δ=(+)0.0832±0.0028 and 0.1513±0.0017μN2 for Ne21 and Na21, respectively (with Krane and Steffen sign convention). By using the effective charges ep=1.5e and en=0.5e, the B(E2) values produced by the p-sd shell model are 30.7 and 36.4 W.u. for Ne21 and Na21, respectively. This analysis resolves a significant discrepancy between a previous experimental result for Na21 and shell-model calculations.

  17. VPLIV DIREKTNEGA IN DIFUZNEGA SONČNEGA SEVANJA NA SILICIJEVE SONČNE CELICE

    OpenAIRE

    Veberič, Tomi

    2011-01-01

    Cilj diplomske naloge je ovrednotenje električnih lastnosti in vpliva sončnega sevanja na silicijeve sončne celice s pomočjo opravljenih raziskav in meritev. Rezultate meritev sončnega sevanja smo analizirali s programskim paketom Matlab. Pri sami analizi smo na podlagi večletnih meritev sončnega sevanja izračunali izkoristek posamezne silicijeve sončne celice glede na direktno in difuzno komponento sončnega sevanja in tako ovrednotili električne lastnosti sončnih celic. V okviru tega smo v d...

  18. Teleconference highlights-NE-NA proliferation resistance review

    International Nuclear Information System (INIS)

    Miller, Michael C.

    2009-01-01

    Herczeg gave a readout from the kickoff meeting with Paul Lisowski - namely develop a common definition of proliferation resistance (for use by S-1, other upper management, public affairs, etc.), and to evaluate possible framework where a metric could be assigned for fuel cycle comparisons (integral, easy to communicate). Sprinkle raised concern about 'trivializing' notion of proliferation resistance (PR), with idea of making sure we don't lose the concept that strong safeguards and security are required within a nonproliferation framework that support U.S. policy goals. Integrated Safeguards by Design notion was brought up in this context. Round table discussion of the term PR, its misuse (even unintentional), fact that Chu is using term and apparently in context of proliferation proof. It was noted that there has been much work already done in this area and we should not reinvent the wheel. One of the first tasks needs to be gathering up old reports (TOPS, Como, PRPP, etc) and distributing to group (action item for all). It was also noted that there are multiple definitions of PR, including the recent NPIA, supporting the need for this type of activity. Miller described the current work package under AFCI, with $50k of funding from the campaign management account. Herczeg asked about additional funds should it become clear that a larger effort is required (tension between current program and getting something out relatively soon). Goldner to look into potential additional funds. Miller notes that within current work package, easy to engage LANL participants and that Per Peterson can participate under UCB funding (a new center is being established with UC fee awards from LANL and LLNL - the Berkeley Nuclear Research Center). Consensus that Per would be a good external member of the group. Sprinkle notes that held like to coordinate the NE and NA work packages. Miller and Sprinkle to work offline. Wallace talked about the possibility of being more quantitative in

  19. Study of the 28Si(16O,20Ne)24Mg reaction

    International Nuclear Information System (INIS)

    Portezan Filho, O.

    1988-01-01

    In this work, measurements of elastic and inelastic angular distributions in the system 16 O+ 20 Si and in the alpha transfer reactions 20 Si( 16 O, 20 Ne) 24 Mg were made in the angular range of 20 0 0 and the transfer reaction 20 Si( 16 O, 12 C) 32 S in the angular range 16 0 0 at the energy of E cm = 31.57 MeV. Optical potential parameters and β 2 deformation parameters as well as spectroscopic factors were determined for the alpha transfer reactions. (A.C.A.S.) [pt

  20. UTJECAJ TRŽIŠNE ORIJENTACIJE HRVATSKIH PODUZEĆA NA INOVACIJE PROIZVODA I USLUGA

    OpenAIRE

    Miloloža, Helena

    2016-01-01

    Tržišna orijentacija pridonosi boljem razumijevanju tržišta i unaprjeđuje nastup poduzeća na tržištu. Kao složena marketinška koncepcija, ostvaruje bitan utjecaj na inovacijske procese u poduzeću. Međutim, rezultati dosadašnjih istraživanja korelacijskog odnosa između tržišne orijentacije i inovacija pokazali su da učinak tržišne orijentacije može biti i pozitivan i negativan. Stoga je cilj ovog rada analizirati tržišnu orijentaciju i inovativnost poduzeća te ispitati utjecaj tržišne orijenta...

  1. Mass spectra and fusion cross sections for 20Ne+24Mg interaction at 55 and 85 MeV

    International Nuclear Information System (INIS)

    Grotowski, K.; Belery, P.; Delbar, T.; El Masri, Y.; Gregoire, G.; Janssens, R.; Vervier, J.; Paic, G.; Albinska, M.; Albinski, J.; Kopta, S.; Kozik, T.; Planeta, R.

    1981-01-01

    Inclusive γ spectra from the 20 Ne+ 24 Mg interaction have been measured using 55- and 85-MeV 20 Ne ions. The identification of γ lines allows the determination of mass spectra in the region 12< or =A< or =43. Experimental results are compared with statistical model calculations. The total reaction and fusion cross sections are extracted. Cross sections for inelastic scattering, few nucleon transfers, and deep inelastic scattering are estimated

  2. Beta decay of 31,32Na and 31Mg

    International Nuclear Information System (INIS)

    Klotz, G.; Baumann, P.; Bounajma, M.; Huck, A.; Knipper, A.; Walter, G.; Poves, A.; Retamosa, J.

    1993-01-01

    31,32 Na and 31 Mg beta decays were studied at the CERN on-line mass separator ISOLDE by gamma, gamma-gamma and neutron-gamma measurements. In the 31 Na decay, the assignment of previously reported γ transitions and the observation of a new level at 3760 keV lead to a revised decay scheme. In the 31 Mg → 31 Al decay, a new decay scheme involves ten β branches and three states are reported for the first time. New spectroscopic results have been obtained in the 32 Na β - decay. A previously non-interpreted 1436 keV γ ray is now assigned in the 32 Mg scheme. (author) 33 refs., 16 figs., 12 tabs

  3. Charge Exchange of Highly Charged Ne and Mg Ions with H and He

    Science.gov (United States)

    Lyons, D.; Cumbee, R. S.; Stancil, P. C.

    2017-10-01

    Cross sections for single electron capture (SEC), or charge exchange (CX), in collisions of Ne(8-10)+ and Mg(8-12)+ with H and He, are computed using an approximate multichannel Landau-Zener (MCLZ) formalism. Final-state-resolved cross sections for the principal (n), orbital angular momentum (ℓ), and where appropriate, total spin angular momentum (S) quantum numbers are explicitly computed, except for the incident bare ions Ne10+ and Mg12+. In the latter two cases, n{\\ell }-resolution is obtained from analytical ℓ-distribution functions applied to n-resolved MCLZ cross sections. In all cases, the cross sections are computed over the collision energy range 1 meV/u to 50 keV/u with LZ parameters estimated from atomic energies obtained from experiment, theory, or, in the case of high-lying Rydberg levels, estimated with a quantum defect approach. Errors in the energy differences in the adiabatic potentials at the avoided crossing distances give the largest contribution to the uncertainties in the cross sections, which are expected to increase with decreasing cross section magnitude. The energy differences are deduced here with the Olson-Salop-Tauljberg radial coupling model. Proper selection of an ℓ-distribution function for bare ion collisions introduces another level of uncertainty into the results. Comparison is made to existing experimental or theoretical results when available, but such data are absent for most considered collision systems. The n{\\ell }S-resolved SEC cross sections are used in an optically thin cascade simulation to predict X-ray spectra and line ratios that will aid in modeling the X-ray emission in environments where CX is an important mechanism. Details on a MCLZ computational package, Stueckelberg, are also provided.

  4. RAZVOJ IN IMPLEMENTACIJA BREZŽIČNE TEHTNICE NA PLATFORMI ESP8266

    OpenAIRE

    Prevolšek, Matic

    2016-01-01

    V diplomskem delu opisujemo razvoj in implementacijo brezžične tehtnice na platformi ESP8266. Meritve zajemamo s pomočjo štirih merilnih celic in analogno-digitalnega pretvornika HX711. Uporabniku meritve prikazujemo v obliki spletne strani, ki gostuje na platformi ESP8266 in je dosegljiva znotraj lokalnega omrežja WiFi. Hkrati meritve pošiljamo na zunanji strežnik in jih zapisujemo v podatkovno bazo. S spletno aplikacijo na zunanjem strežniku grafično predstavimo meritve skozi čas.

  5. Adsorption of Na, Mg, and Al atoms on BN nanotubes

    Energy Technology Data Exchange (ETDEWEB)

    Beheshtian, Javad [Department of Chemistry, Shahid Rajaee Teacher Training University, P.O. Box: 16875-163, Tehran (Iran, Islamic Republic of); Peyghan, Ali Ahmadi, E-mail: ahmadi.iau@gmail.com [Young Researchers Club, Islamic Azad University, Islamshahr Branch, Tehran (Iran, Islamic Republic of); Bagheri, Zargham [Physics group, Science department, Islamic Azad University, Islamshahr Branch, P.O. Box: 33135-369, Islamshahr, Tehran (Iran, Islamic Republic of)

    2012-12-30

    Adsorption of three metals (Na, Mg, and Al) on the surface of BN nanotubes (BNNT) has been investigated by using density functional theory. Adsorption energies for Na and Al atoms have been calculated to be about - 0.22 to - 0.61 eV, respectively. Upon the metal adsorption, energy gap between highest occupied and lowest unoccupied orbitals of the tube is dramatically decreased, resulting in enhanced electrical conductivity. However, in the case of Mg atom, the low adsorption energy cannot change electronic property of the tube. The semi-conductive BNNT transform to n-type semiconductor after adsorption of Na atom. The metal adsorption modifies work function of the BNNT and consequently the field-emission current densities of metal-BNNT may be significantly enhanced. - Highlights: Black-Right-Pointing-Pointer Adsorption of Na, Mg, and Al atoms on the BN nanotubes (BNNT) was studied. Black-Right-Pointing-Pointer Adsorption energies for Na and Al atoms are about - 0.22 to - 0.61 eV, respectively. Black-Right-Pointing-Pointer Energy gap of the tube dramatically decreases upon the metals adsorption. Black-Right-Pointing-Pointer Semiconductor BNNT transform to n-type ones upon adsorption of Na and Al atoms. Black-Right-Pointing-Pointer The field-emission current densities of metal-BNNT may be significantly enhanced.

  6. DISTRIBUTION OF MAJOR ELEMENTS (NA, K, CA, MG) IN THE ...

    African Journals Online (AJOL)

    Levels of sodium, potassium, calcium and magnesium were determined in plant organs (bud, flowers, fruit, seed, leaves, stems, roots, cobs, styles, shaft, grains and efflorescences) of three Fadama farms located in Ifaki-Ekiti, Ado-Ekiti and Ikere-Ekiti of Ekiti State, Nigeria. The highest levels of Mg, K, Na and Ca were ...

  7. Collision based spectroscopy of Na- and Mg-like argon

    International Nuclear Information System (INIS)

    Zou, Y.; Wang, M.; Heijkenskoeld, F.; Hutton, R.

    1997-01-01

    In this work, Ne-like Ar 8+ ions in metastable 2p 5 3s 3 P 0.2 levels from an ECR source were passed through a He gas target to populate core excited levels of Na-like Ar 7+ . The resulting spectra were measured and compared with those from Ar 9+ passing the same He target. The population mechanism for core excited 2p 5 3p 2 based on one electron capture by the metastable Ar 8+ levels is discussed. Our results indicate that the two electron-one photon transitions from 2p 5 3s4p is the main populating process. Also, by increasing the length of the gas target, enhancement of the intensity ratio between lines from long lived and short lived levels was observed. (orig.)

  8. Cross Section Measurements of the Reaction 23Na(p, γ)24Mg

    Science.gov (United States)

    Boeltzig, Axel; Deboer, Richard James; Macon, Kevin; Wiescher, Michael; Best, Andreas; Imbriani, Gianluca; Gyürky, György; Strieder, Frank

    2017-09-01

    The reaction 23Na(p, γ)24Mg can provide a link from the NeNa to the MgAl cycle in stellar burning and is therefore of interest in nuclear astrophysics. To determine the reaction rates at stellar temperatures, new cross section measurements at low proton energies have been performed recently, and further experiments are underway. The current cross section data implies that the reaction rate up to temperatures of 1 GK is determined by a few narrow resonances and direct capture. Complementary to these experimental efforts at low proton energies, cross section measurements at higher energies can help to constrain the direct capture and broad resonance contributions to the cross section and reduce the uncertainty of the extrapolation towards stellar energies. In this paper we report an experiment to measure the 23Na(p, γ)24Mg cross section with a solid target setup at the St. ANA 5U accelerator at the University of Notre Dame. The experiment and the current status of data analysis will be described. This work benefited from support by the National Science Foundation under Grant No. PHY-1430152 (JINA-CEE), the Nuclear Science Laboratory (NSL), the Istituto Nazionale di Fisica Nucleare (INFN), and the Gran Sasso Science Institute (GSSI).

  9. Density fluctuation effects on collective neutrino oscillations in O-Ne-Mg core-collapse supernovae

    International Nuclear Information System (INIS)

    Cherry, John F.; Fuller, George M.; Wu Mengru; Qian Yongzhong; Carlson, J.; Duan Huaiyu

    2011-01-01

    We investigate the effect of matter density fluctuations on supernova collective neutrino flavor oscillations. In particular, we use full multiangle, three-flavor, self-consistent simulations of the evolution of the neutrino flavor field in the envelope of an O-Ne-Mg core-collapse supernova at shock breakout (neutronization neutrino burst) to study the effect of the matter density ''bump'' left by the He-burning shell. We find a seemingly counterintuitive increase in the overall ν e survival probability created by this matter density feature. We discuss this behavior in terms of the interplay between the matter density profile and neutrino collective effects. While our results give new insights into this interplay, they also suggest an immediate consequence for supernova neutrino burst detection: it will be difficult to use a burst signal to extract information on fossil burning shells or other fluctuations of this scale in the matter density profile. Consistent with previous studies, our results also show that the interplay of neutrino self-coupling and matter fluctuation could cause a significant increase in the ν e survival probability at very low energy.

  10. Structure-function relationships of Na+, K+, ATP, or Mg2+ binding and energy transduction in Na,K-ATPase

    DEFF Research Database (Denmark)

    Jorgensen, Peter L.; Pedersen, Per Amstrup

    2000-01-01

    Na,K-ATPase; Mutagenesis; Na+ binding; K+ binding; Tl+ binding; Mg2+ binding; ATP binding; Cation binding site; Energy transduction......Na,K-ATPase; Mutagenesis; Na+ binding; K+ binding; Tl+ binding; Mg2+ binding; ATP binding; Cation binding site; Energy transduction...

  11. Net sputtering rate due to hot ions in a Ne-Xe discharge gas bombarding an MgO layer

    International Nuclear Information System (INIS)

    Ho, S.; Tamakoshi, T.; Ikeda, M.; Mikami, Y.; Suzuki, K.

    2011-01-01

    An analytical method is developed for determining net sputtering rate for an MgO layer under hot ions with low energy ( h i , above a threshold energy of sputtering, E th,i , multiplied by a yield coefficient. The threshold energy of sputtering is determined from dissociation energy required to remove an atom from MgO surface multiplied by an energy-transfer coefficient. The re-deposition rate of the sputtered atoms is calculated by a diffusion simulation using a hybridized probabilistic and analytical method. These calculation methods are combined to analyze the net sputtering rate. Maximum net sputtering rate due to the hot neon ions increases above the partial pressure of 4% xenon as E h Ne becomes higher and decreases near the partial pressure of 20% xenon as ion flux of neon decreases. The dependence due to the hot neon ions on partial pressure and applied voltage agrees well with experimental results, but the dependence due to the hot xenon ions deviates considerably. This result shows that the net sputtering rate is dominated by the hot neon ions. Maximum E h Ne (E h Ne,max = 5.3 - 10.3 eV) is lower than E th,Ne (19.5 eV) for the MgO layer; therefore, weak sputtering due to the hot neon ions takes place. One hot neon ion sputters each magnesium and each oxygen atom on the surface and distorts around a vacancy. The ratio of the maximum net sputtering rate is approximately determined by number of the ions at E h i,max multiplied by an exponential factor of -E th,i /E h i,max .

  12. A study of interference effects in Na(3S,3P)-Ne, Ar scattering experiments at high angular resolution

    International Nuclear Information System (INIS)

    Berg, F.T.M. van den.

    1984-01-01

    In this thesis the author presents measurements of differential cross sections for the scattering of Na-atoms in the ground-state and first excited-state by the rare gas atoms Ne and Ar. The scattering experiments were performed in a crossed-beam apparatus built and tested by van Deventer et al. The unique high angular-resolution (0.1 0 ) of this beam-scattering apparatus permits us (i) to remove the discrepancies that still exist between the various X 2 Σ- and A 2 PI-potential curves for Na-Ar and Na-Ne reported up to now, (ii) to obtain detailed information on the B 2 Σ-potentials for these systems and (iii) to demonstrate the necessity of taking into account the spin-uncoupling effects, in the interpretation of the experimental Na-Ne scattering patterns. (Auth.)

  13. A high-resolution study of the sup 20 Ne( sup 3 He,t) sup 20 Na reaction and the sup 19 Ne(p,. gamma. ) sup 20 Na reaction rate

    Energy Technology Data Exchange (ETDEWEB)

    Smith, M S; Magnus, P V; Hahn, K I; Howard, A J; Parker, P D [A.W. Wright Nuclear Structure Lab., Yale Univ., New Haven, CT (United States); Champagne, A E; Mao, Z Q [Dept. of Physics, Princeton Univ., NJ (United States)

    1992-01-13

    A high-precision measurement of the {sup 20}Ne({sup 3}He,t){sup 20}Na reaction has been made using implanted {sup 20}Ne transmission targets to obtain pertinent information on the low-energy resonances in the {sup 19}Ne(p,{gamma}){sup 20}Na reaction. Resonance energies (447{+-}5, 658{+-}5, 787{+-}5, and 857{+-}5 keV) and upper limits on total intrinsic widths (<10, <6, <10, and <16 keV) have been measured for four excited states above the 2.199 MeV proton threshold in {sup 20}Na. The stellar {sup 19}Ne(p,{gamma}){sup 20}Na reaction rate is calculated for temperatures between 1x10{sup 8} and 1x10{sup 9} K. When combined with a recent study of the {sup 15}O({alpha},{gamma}){sup 19}Ne reaction, a new estimate is made of the conditions required for breakout from the Hot CNO cylce to the rapid proton capture process. (orig.).

  14. Coplanarity of two-proton emissions in 400 MeV/nucleon Ne + NaF, Pb reactions

    International Nuclear Information System (INIS)

    Tanihata, Isao.

    1984-10-01

    Two-proton coincidence spectra have been measured in a wide kinematical range for 20 Ne + NaF and 20 Ne + Pb collisions at 400 MeV/nucleon. Coplanar-type correlations show different feature between Ne + NaF and Ne + Pb target reactions. A strong in-plane correlation, which correspond to quasi-elastic scatterings (QES) of nucleons, was observed in wide angular range (15 to 90 0 ) in NaF target collisions. Angular distributions of QES were reproduced reasonably well by a single nucleon-nucleon scattering model. Enhancement of the QES at momentum transfer around t = 2 - 3m/sub π/, which is predicted as an indication of pionic instability, was not observed. In Ne + Pb collisions, an azimuthally asymmetric emission of particles with respect to the beam axis were implied by the anti-coplanar correlation. A new type of coplanar correlation between the emission angle and the momentum suggests a back-to-back emission of projectile and target nucleons. 8 references, 8 figures

  15. Constraining the 19Ne(p,γ)20Na Reaction Rate Using a Direct Measurement at DRAGON

    Science.gov (United States)

    Wilkinson, R.; Lotay, G.; Lennarz, A.; Ruiz, C.; Christian, G.; Akers, C.; Catford, W. N.; Chen, A. A.; Connolly, D.; Davids, B.; Hutcheon, D. A.; Jedrejcic, D.; Laird, A. M.; Martin, L.; McNeice, E.; Riley, J.; Williams, M.

    2018-01-01

    A direct measurement of the 19Ne(p, γ)20 Na reaction has been performed in inverse kinematics at the DRAGON recoil separator, at an energy ˜ 10 keV higher than previous measurements. The key resonance in the 19 Ne + p system relevant for ONe novae and Type-I X-ray burst temperatures have been successfully measured for the first time. Preliminary estimates of the resonance energy and strength are reported as Ec.m. ≈ 458 keV and ωγ ≈ 18 meV. These results are consistent with previous direct measurements, but disagree with the most recent study of the 19Ne(p, γ)20 Na reaction rate. These preliminary results will be finalised after a forthcoming negative log-likelihood analysis.

  16. Analyses of electron and proton scattering to low excitation isoscalar states in 20Ne, 24Mg and 28Si

    International Nuclear Information System (INIS)

    Amos, K.; Bauhoff, W.

    1983-01-01

    Intermediate energy inelastic proton scattering differential cross section and polarization data from the 2 1 + states in 24 Mg and 28 Si and from the 4 1 + states in 28 Si have been analysed using the Distorted Wave Approximation with large basis models of nuclear structure. These structure models were tested by use in analyses of the longitudinal form factors obtained from inelastic electron scattering, so that analyses of the intermediate energy (p,p') data from the same transitions are then sensitive tests of the two-nucleon t-matrix. Data from these and other 2 1 + transitions in 12 C and 20 Ne at 49 MeV (24 MeV in the case of 20 Ne), were also analysed to compare models of t-matrices at lower energies. An ancilliary study of the momentum transfer dependence of effective charges has been made as both s-d shell and large basis structure models have been used to compare with form factor data up to momentum transfers of 2.5 fm -1 . The deduced momentum dependence of the effective charges is significant

  17. Sodium source development for pulsed power driven, photopumped NA/NE x-ray laser experiments

    International Nuclear Information System (INIS)

    Burkhalter, P.G.; Cooperstein, G.; Mosher, D.; Ottinger, P.F.; Scherrer, V.E.; Stephanakis, S.J.; Young, F.C.; Hinshelwood, D.D.; Mehlman, G.; Welch, B.L.; Jones, W.D.

    1988-01-01

    A sodium plasma source is being developed for a resonant photopumping x-ray laser scheme in which the 11A 1s 2 - 1s2rho 1 P 1 line in heliumlike Na X is used to pump the Ne IX n=4 singlet level. In their experiment the NRL Gamble II generator is used to produce two z-pinch plasmas in a side-by-side geometry. The sodium plasma is produced on axis and conducts the full 1 MA machine current. A fraction of this current returns through a neon gas puff located 5 cm from the sodium. This separation is determined by the need to prevent the plasmas from mixing and the need to have each plasma's azimuthal magnetic field as symmetric as possible. A minimum separation is desirable to increase coupling efficiency. To improve the pump source, a more confined source of pure sodium involving a coaxial plasma gun is being developed. They are currently studying both the operation of this source on a test stand and implosions of the resulting plasma on Gamble II. In initial experiments aluminum is substituted for sodium. Test stand diagnostics include photodiodes, witness plates, and current monitors designed to investigate the early motion of the annular plasma. Results from test stand and Gamble II experiments with both aluminum and sodium, as well as sodium handling techniques, are presented

  18. Study of some excited states in 21Ne-21Na, 18O-18F and 15N-15O nuclei

    International Nuclear Information System (INIS)

    Drain, D.

    1977-01-01

    The study of 21 Ne- 21 Na, 18 O- 18 F and 15 N- 15 O nuclei was performed through proton capture and transfer reactions and allows to determine the spins and parities of some excited states, give the gamma deexcitation schemes of these levels, compute the neutron and proton reduced width γ 2 sub(n) and γ 2 sub(p). The levels studied are: in 21 Na 4.15 20 Ne(p,p), (p,p'), (p,p'γ) and (pγ) reactions) and in 21 Ne: E(exc)=4.73, 5.69 and 5.78 MeV ( 20 Ne (p,p) reaction); in 18 O: E(exc) 17 O(d,p) reaction); in 15 O: 8.92 MeV doublet and 8.98 MeV level (angular correlation 14 N(p,γγ) and in 15 N: 9.05 14 N(d,p) reaction). A comparison with theoretical results is discussed and analog states are pointed out [fr

  19. What are the advantages of a three body model with core excitation for 21Ne and 21Na?

    International Nuclear Information System (INIS)

    Nunes, F.M.; Thompson, I.J.

    2004-01-01

    21 Ne and 21 Na are well bound nuclei and there is a large amount of data available up to considerable excitation energy, and this imposes a severe test on the structure models. Preliminary results for the structure of these nuclei based on three body models ( 21 Ne= 16 O+α+n and 21 Na= 16 O+α+p) are presented. Three-body calculations without core excitation produce the positive parity states in fair agreement with experiment, while slightly overbinding the systems. As expected, these models fail to reproduce the low lying negative parity states, which are predicted by shell model to have mainly core excited configurations. As a first step we have included the 3 - state of 16 O in our model. Convergence issues will be discussed. Results suggest that more excited states may be required to describe the system

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

    Energy Technology Data Exchange (ETDEWEB)

    Menzel, Marie-Luise

    2013-08-01

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

  1. Experimental study of the 22Ne(p,γ)23Na reaction and its implications for novae scenarios

    International Nuclear Information System (INIS)

    Menzel, Marie-Luise

    2013-01-01

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

  2. Breaking of the neutron magic number N=20 in 32Mg and 30Ne and its possible relation to the cluster structure

    International Nuclear Information System (INIS)

    Kimura, Masaaki; Horiuchi, Hisashi

    2002-01-01

    The neutron-rich nuclei 32 Mg and 30 Ne are studied using a new version of antisymmetrized molecular dynamics (AMD). Due to the use of a deformed Gaussian as the single particle wave packet, the description of the deformation properties of Mg isotopes is drastically improved, and l·s force is accounted for more largely and sufficiently. After the angular momentum projection, 32 Mg and 30 Ne have deformed ground states, and the experimental data for 32 Mg are reproduced with reasonable accuracy. The deformation of the mean field is found to be essential to describe these nuclei. The ground states of these nuclei have neutron 2p2h structure. In 30 Ne, the cluster-like and the mean-field-like structures coexist. The ground state of 32 Mg has a mean-field-like structure. In the vicinity of the ground state, this nucleus is expected to have excited states with cluster-like structure that possesses the neutron 4p4h configuration. (author)

  3. Breaking of the neutron magic number N=20 in {sup 32}Mg and {sup 30}Ne and its possible relation to the cluster structure

    Energy Technology Data Exchange (ETDEWEB)

    Kimura, Masaaki; Horiuchi, Hisashi [Kyoto Univ. (Japan). Dept. of Physics

    2002-01-01

    The neutron-rich nuclei {sup 32}Mg and {sup 30}Ne are studied using a new version of antisymmetrized molecular dynamics (AMD). Due to the use of a deformed Gaussian as the single particle wave packet, the description of the deformation properties of Mg isotopes is drastically improved, and l{center_dot}s force is accounted for more largely and sufficiently. After the angular momentum projection, {sup 32}Mg and {sup 30}Ne have deformed ground states, and the experimental data for {sup 32}Mg are reproduced with reasonable accuracy. The deformation of the mean field is found to be essential to describe these nuclei. The ground states of these nuclei have neutron 2p2h structure. In {sup 30}Ne, the cluster-like and the mean-field-like structures coexist. The ground state of {sup 32}Mg has a mean-field-like structure. In the vicinity of the ground state, this nucleus is expected to have excited states with cluster-like structure that possesses the neutron 4p4h configuration. (author)

  4. Thermodynamic modeling of hydrogen storage capacity in Mg-Na alloys.

    Science.gov (United States)

    Abdessameud, S; Mezbahul-Islam, M; Medraj, M

    2014-01-01

    Thermodynamic modeling of the H-Mg-Na system is performed for the first time in this work in order to understand the phase relationships in this system. A new thermodynamic description of the stable NaMgH3 hydride is performed and the thermodynamic models for the H-Mg, Mg-Na, and H-Na systems are reassessed using the modified quasichemical model for the liquid phase. The thermodynamic properties of the ternary system are estimated from the models of the binary systems and the ternary compound using CALPHAD technique. The constructed database is successfully used to reproduce the pressure-composition isotherms for MgH2 + 10 wt.% NaH mixtures. Also, the pressure-temperature equilibrium diagram and reaction paths for the same composition are predicted at different temperatures and pressures. Even though it is proved that H-Mg-Na does not meet the DOE hydrogen storage requirements for onboard applications, the best working temperatures and pressures to benefit from its full catalytic role are given. Also, the present database can be used for thermodynamic assessments of higher order systems.

  5. Thermodynamic Modeling of Hydrogen Storage Capacity in Mg-Na Alloys

    Science.gov (United States)

    Abdessameud, S.; Mezbahul-Islam, M.; Medraj, M.

    2014-01-01

    Thermodynamic modeling of the H-Mg-Na system is performed for the first time in this work in order to understand the phase relationships in this system. A new thermodynamic description of the stable NaMgH3 hydride is performed and the thermodynamic models for the H-Mg, Mg-Na, and H-Na systems are reassessed using the modified quasichemical model for the liquid phase. The thermodynamic properties of the ternary system are estimated from the models of the binary systems and the ternary compound using CALPHAD technique. The constructed database is successfully used to reproduce the pressure-composition isotherms for MgH2 + 10 wt.% NaH mixtures. Also, the pressure-temperature equilibrium diagram and reaction paths for the same composition are predicted at different temperatures and pressures. Even though it is proved that H-Mg-Na does not meet the DOE hydrogen storage requirements for onboard applications, the best working temperatures and pressures to benefit from its full catalytic role are given. Also, the present database can be used for thermodynamic assessments of higher order systems. PMID:25383361

  6. Corrosion behaviour of Mg-Cu and Mg-Mo composites in 3.5% NaCl

    International Nuclear Information System (INIS)

    Budruk Abhijeet, S.; Balasubramaniam, R.; Gupta, M.

    2008-01-01

    The corrosion behaviour of pure magnesium, Mg-Cu (0.3, 0.6, and 1 vol.%) and Mg-Mo (0.1, 0.3, and 0.6 vol.%) composites has been studied in 3.5% NaCl solution by weight loss and polarisation methods. Corrosion rates determined by weight loss method were considerably higher than that determined by polarisation method. The corrosion rate increased with increasing volume fraction of reinforcement in Mg-Cu and Mg-Mo composites. At the same volume fraction of reinforcement, molybdenum reinforced composite corroded faster than copper reinforced composite. The galvanic current density between Mg-Cu and Mg-Mo couples has been experimentally measured using zero resistance ammeter technique. The experimentally observed galvanic current densities were in close agreement with those obtained using mixed potential theory analysis. SEM observation of corroded samples confirmed microgalvanic activity at the matrix/reinforcement interfaces. The poor corrosion resistance of composites has been attributed to microgalvanic effects between the matrix and reinforcements and inferior quality of surface films

  7. Experimental Investigation of the ^{19}Ne(p,γ)^{20}Na Reaction Rate and Implications for Breakout from the Hot CNO Cycle.

    Science.gov (United States)

    Belarge, J; Kuvin, S A; Baby, L T; Baker, J; Wiedenhöver, I; Höflich, P; Volya, A; Blackmon, J C; Deibel, C M; Gardiner, H E; Lai, J; Linhardt, L E; Macon, K T; Need, E; Rasco, B C; Quails, N; Colbert, K; Gay, D L; Keeley, N

    2016-10-28

    The ^{19}Ne(p,γ)^{20}Na reaction is the second step of a reaction chain which breaks out from the hot CNO cycle, following the ^{15}O(α,γ)^{19}Ne reaction at the onset of x-ray burst events. We investigate the spectrum of the lowest proton-unbound states in ^{20}Na in an effort to resolve contradictions in spin-parity assignments and extract reliable information about the thermal reaction rate. The proton-transfer reaction ^{19}Ne(d,n)^{20}Na is measured with a beam of the radioactive isotope ^{19}Ne at an energy around the Coulomb barrier and in inverse kinematics. We observe three proton resonances with the ^{19}Ne ground state, at 0.44, 0.66, and 0.82 MeV c.m. energies, which are assigned 3^{+}, 1^{+}, and (0^{+}), respectively. In addition, we identify two resonances with the first excited state in ^{19}Ne, one at 0.20 MeV and one, tentatively, at 0.54 MeV. These observations allow us for the first time to experimentally quantify the astrophysical reaction rate on an excited nuclear state. Our experiment shows an efficient path for thermal proton capture in ^{19}Ne(p,γ)^{20}Na, which proceeds through ground state and excited-state capture in almost equal parts and eliminates the possibility for this reaction to create a bottleneck in the breakout from the hot CNO cycle.

  8. MgO-templated carbon as a negative electrode material for Na-ion capacitors

    Science.gov (United States)

    Kado, Yuya; Soneda, Yasushi

    2016-12-01

    In this study, MgO-templated carbon with different pore structures was investigated as a negative electrode material for Na-ion capacitors. With increasing the Brunauer-Emmett-Teller surface area, the irreversible capacity increased, and the coulombic efficiency of the 1st cycle decreased because of the formation of solid electrolyte interface layers. MgO-templated carbon annealed at 1000 °C exhibited the highest capacity and best rate performance, suggesting that an appropriate balance between surface area and crystallinity is imperative for fast Na-ion storage, attributed to the storage mechanism: combination of non-faradaic electric double-layer capacitance and faradaic Na intercalation in the carbon layers. Finally, a Na-ion capacitor cell using MgO-templated carbon and activated carbon as the negative and positive electrodes, respectively, exhibited an energy density at high power density significantly greater than that exhibited by the cell using a commercial hard carbon negative electrode.

  9. Influence of Na, K, Ca and Mg on lead atomization by tungsten coil atomic absorption spectrometry

    Directory of Open Access Journals (Sweden)

    Oliveira Pedro V. de

    2000-01-01

    Full Text Available The atomization of lead in an electrothermal tungsten coil atomizer in the presence and absence of Na+, K+, Ca2+ and Mg2+ was investigated with the objective of understanding the interference processes. The lead atomization was less affected by Ca2+ and Mg2+ than by Na+ and K+. In the absence of concomitants, lead atomization efficiency was improved by the presence of H2 (10% v/v in the purge gas composition, during pyrolysis and atomization steps. The interference caused by Na+ and Ca2+ was negligible when the pyrolysis step was accomplished without H2 in the purge gas composition. The results showed that Na+, K+, Ca2+ and Mg2+ are directly involved in competition reactions for H2 in condensed phase.

  10. Analysis of high-n dielectronic Rydberg satellites in the spectra of Na-like Zn XX and Mg-like Zn XIX

    International Nuclear Information System (INIS)

    Fournier, K.B.; Faenov, A.Ya.; Pikuz, T.A.; Magunov, A.I.; Skobelev, I.Yu.; Flora, F.; Bollanti, S.; Di Lazzaro, P.; Murra, D.; Belyaev, V.S.; Vinogradov, V.I.; Kyrilov, A.S.; Matafonov, A.P.; Francucci, M.; Martellucci, S.; Petrocelli, G.

    2004-01-01

    We have observed spectra from highly charged zinc ions in a variety of laser-produced plasmas. Spectral features that are Na- and Mg-like satellites to high-n Rydberg transitions in the Ne-like Zn XXI spectrum are analyzed and modeled. Identifications and analysis are made by comparison with highly accurate atomic structure calculations and steady state collisional-radiative models. Each observed Zn XX and Zn XIX feature comprises up to ≅2 dozen individual transitions, these transitions are excited principally by dielectronic recombination through autoionizing levels in Na- and Mg-like Zn 19+ and Zn 18+ . We find these satellites to be ubiquitous in laser-produced plasmas formed by lasers with pulse lengths that span four orders of magnitude, from 1 ps to ≅10 ns. The diagnostic potential of these Rydberg satellite lines is demonstrated

  11. Study of Ne and Kr production in Mg, Al, Rb, Sr and Y targets by 0-180 MeV neutrons. Cosmochemical application

    International Nuclear Information System (INIS)

    Bertin, P.

    1989-07-01

    High sensitivity mass spectrometry technique has been used to measure production of noble gases Ne and Kr induced by 0-180 MeV neutrons in Mg, Al, Rb, Sr and Y targets. This experiment allowed us an evaluation of the implied excitation functions, in an energy range where no experimental data were available. These results have exhibited the importance of secondary neutrons induced in the interaction of cosmic rays with meteorites and moon surface [fr

  12. Role of deformation in odd-even staggering in reaction cross sections for 30,31,32Ne and 36,37,38Mg isotopes

    Science.gov (United States)

    Urata, Y.; Hagino, K.; Sagawa, H.

    2017-12-01

    We discuss the role of pairing antihalo effect in the observed odd-even staggering in reaction cross sections for 30,31,32Ne and 36,37,38Mg isotopes by taking into account the ground-state deformation of these nuclei. To this end, we construct the ground-state density for the Ne,3130 and Mg,3736 nuclei based on a deformed Woods-Saxon potential, while for the 32Ne and 38Mg nuclei we also take into account the pairing correlation using the Hartree-Fock-Bogoliubov method. We demonstrate that, when the one-neutron separation energy is small for the odd-mass nuclei, a significant odd-even staggering still appears even with finite deformation, although the degree of staggering is somewhat reduced compared to the spherical case. This implies that the pairing antihalo effect in general plays an important role in generating the odd-even staggering in reaction cross sections for weakly bound nuclei.

  13. Matrix effects in ion-induced emission as observed in Ne collisions with Cu-Mg and Cu-Al alloys

    Science.gov (United States)

    Ferrante, J.; Pepper, S. V.

    1983-01-01

    Ion induced Auger electron emission is used to study the surfaces of Al, Mg, Cu - 10 at. % Al, Cu - 19.6 at. % Al, and Cu - 7.4 at. % Mg. A neon (Ne) ion beam whose energy is varied from 0.5 to 3 keV is directed at the surface. Excitation of the lighter Ne occurs by the promotion mechanism of Barat and Lichten in asymmetric collisions with Al or Mg atoms. Two principal Auger peaks are observed in the Ne spectrum: one at 22 eV and one at 25 eV. Strong matrix effects are observed in the alloys as a function of energy in which the population of the second peak is greatly enhanced relative to the first over the pure materials. For the pure material over this energy range this ratio is 1.0. For the alloys it can rise to the electronic structure of alloys and to other surface tools such as secondary ion mass spectroscopy.

  14. Zavedanje pomembnosti vertikalnega komuniciranja med nadrejenimi in podrejenimi v podjetju in vpliv na (ne) uspeh podjetja

    OpenAIRE

    Bezjak, Mojca

    2017-01-01

    Vertikalno komuniciranje je dvosmerno komuniciranje - povraten proces.Predstavimo vertikalno komuniciranje med nadrejenimi in podrejenimi v podjetju in vpliv na uspeh podjetja.Predstavitev različnih vrst komuniciranja, vplivov komuniciranja na človeka. Opišemo povezanost vertikalnega komuniciranja,medsebojnih odnosov in uspeh podjetja. V empiričnem delu diplomskega projekta z odgovori na vprašanja, ki se navezujejo na vertikalno komuniciranje in medsebojne odnose med nadrejenimi in podrejenim...

  15. Combustion of Na2B4O7 + Mg + C to synthesis B4C powders

    International Nuclear Information System (INIS)

    Jiang Guojian; Xu Jiayue; Zhuang Hanrui; Li Wenlan

    2009-01-01

    Boron carbide powder was fabricated by combustion synthesis (CS) method directly from mixed powders of borax (Na 2 B 4 O 7 ), magnesium (Mg) and carbon. The adiabatic temperature of the combustion reaction of Na 2 B 4 O 7 + 6 Mg + C was calculated. The control of the reactions was achieved by selecting reactant composition, relative density of powder compact and gas pressure in CS reactor. The effects of these different influential factors on the composition and morphologies of combustion products were investigated. The results show that, it is advantageous for more Mg/Na 2 B 4 O 7 than stoichiometric ratio in Na 2 B 4 O 7 + Mg + C system and high atmosphere pressure in the CS reactor to increase the conversion degree of reactants to end product. The final product with the minimal impurities' content could be fabricated at appropriate relative density of powder compact. At last, boron carbide without impurities could be obtained after the acid enrichment and distilled water washing.

  16. Experimental investigation of the reactions {sup 25}Mg({alpha},n){sup 28}Si, {sup 26}Mg({alpha},n){sup 29}Si, {sup 18}O({alpha},n){sup 21}Ne and their impact on stellar nucleosynthesis

    Energy Technology Data Exchange (ETDEWEB)

    Falahat, Sascha

    2010-06-10

    In the present dissertation, the nuclear reactions {sup 25}Mg({alpha},n){sup 28}Si, {sup 26}Mg({alpha},n){sup 29}Si, {sup 18}O({alpha},n){sup 21}Ne are investigated in the astrophysically interesting energy region from E{sub {alpha}}=1000 keV to E{sub {alpha}}=2450 keV. The experiments were performed at the Nuclear Structure Laboratory of the University of Notre Dame (USA) with the Van-de-Graaff accelerator KN. Solid state targets with evaporated magnesium or anodized oxygen were bombarded with {alpha}-particles and the released neutrons detected. For the detection of the released neutrons, computational simulations were used to construct a neutron detector based on {sup 3}He counters. Because of the strong occurrence of background reactions, different methods of data analysis were employed. Finally, the impact of the reactions {sup 25}Mg({alpha},n){sup 28}Si, {sup 26}Mg({alpha},n){sup 29}Si, {sup 18}O({alpha},n){sup 21}Ne on stellar nucleosynthesis is investigated by means of network calculations. (orig.)

  17. Experimental investigation of the reactions 25Mg(α,n)28Si, 26Mg(α,n)29Si, 18O(α,n)21Ne and their impact on stellar nucleosynthesis

    International Nuclear Information System (INIS)

    Falahat, Sascha

    2010-01-01

    In the present dissertation, the nuclear reactions 25 Mg(α,n) 28 Si, 26 Mg(α,n) 29 Si, 18 O(α,n) 21 Ne are investigated in the astrophysically interesting energy region from E α =1000 keV to E α =2450 keV. The experiments were performed at the Nuclear Structure Laboratory of the University of Notre Dame (USA) with the Van-de-Graaff accelerator KN. Solid state targets with evaporated magnesium or anodized oxygen were bombarded with α-particles and the released neutrons detected. For the detection of the released neutrons, computational simulations were used to construct a neutron detector based on 3 He counters. Because of the strong occurrence of background reactions, different methods of data analysis were employed. Finally, the impact of the reactions 25 Mg(α,n) 28 Si, 26 Mg(α,n) 29 Si, 18 O(α,n) 21 Ne on stellar nucleosynthesis is investigated by means of network calculations. (orig.)

  18. Examination and experimental constraints of the stellar reaction rate factor N-A of the Ne-18(alpha, p)Na-21 reaction at temperatures of x-ray bursts

    NARCIS (Netherlands)

    Matic, A.; Mohr, P.

    2013-01-01

    The Ne-18(alpha, p)Na-21 reaction is one key for the breakout from the hot CNO cycles to the rp-process. Recent papers have provided reaction rate factors N-A which are discrepant by at least one order of magnitude. The compatibility of the latest experimental results is tested, and a partial

  19. Quantitative X-ray spectroscopy of sodium Z-pinch plasmas for Na/ne photopumping

    International Nuclear Information System (INIS)

    Burkhalter, P.G.; Mehlman, G.; Apruzese, J.P.; Newman, D.A.; Scherrer, V.E.; Young, F.C.; Stephanakis, S.J.; Hinshelwood, D.D.

    1990-01-01

    Spectra of sodium K-shell x-ray emission were measured for implosions of sodium-bearing plasmas produced on the Naval Research Laboratory Gamble II pulsed-power generator. Sodium fluoride from a capillary discharge provided the initial plasma for these fast Z-pinch implosions. Spatially-resolved images, corresponding to sodium K-shell x-rays from a 3 to 4 cm long plasma column, were recorded with a curved-crystal spectrograph. Non-uniform emission was observed along this column. The diameter of the plasma along the column (1-5 mm) was determined from time-integrated pinhole-camera images, and the duration of the x-ray emission (15-23 ns FWHM) was measured with a vacuum x-ray diode. Absolute emissivities were determined for X-rays from the n=2-1 and n=3-1 transitions in Na X and Na XI. Emissivities calculated using a collisional-radiative equilibrium model were fitted to these measurements to determine plasma temperatures of 230 to 550 eV and electron densities of 0.2 to 4.0 x 10 20 cm -3 at several locations along the plasma column. The slope of the recombination continuum was also used to determine temperatures of 200 to 300 eV and 200 to 400 eV for Na X and Na XI ions, respectively. Absolute intensity measurements of the n=2-1 line emissions from Na X and Na XI, averaged over the entire plasma length, indicated shot-to-shot variations of more than a factor of two in these implosions. (author)

  20. 26Mg(p,n)26Al and 23Na(α,n)26Al reactions

    International Nuclear Information System (INIS)

    Skelton, R.T.

    1985-01-01

    Cross sections for the 26 Mg(p,n) 26 Al reaction were measured from threshold at 4.988 MeV to 5.820 MeV. Cross sections for the 23 Na(α,n) 26 Al reaction were measured from threshold at 3.483 MeV to 4.597 MeV. In each case, separate measurements were to the ground state and to the first and second excited states of 26 Al. Cross sections for the inverse reactions were calculated and reaction rate factors relating to the destruction of 26 Al in a supernova environment were determined. Astrophysical implications relating to the observation of live and extinct 26 Al are discussed. Excitation functions for several additional exit channels for the 26 Mg + rho and 23 Na + α reactions are reported

  1. On the distribution and evaluation of Na, Mg and Cl in leaves of selected halophytes

    Energy Technology Data Exchange (ETDEWEB)

    Pongrac, Paula; Vogel-Mikuš, Katarina; Regvar, Marjana [Department of Biology, Biotechnical Faculty, University of Ljubljana, Večna pot 111, SI-1000 Ljubljana (Slovenia); Kaligarič, Mitja [Department of Biology, Faculty of Natural Sciences and Mathematics, Koroška c. 160, SI-2000 Maribor (Slovenia); Vavpetič, Primož; Kelemen, Mitja; Grlj, Nataša [Jožef Stefan Institute, Jamova 39, SI-1000 Ljubljana (Slovenia); Shelef, Oren; Golan-Goldhirsh, Avi; Rachmilevitch, Shimon [French Associates Institute for Agriculture and Biotechnology of Drylands, The Jacob Blaustein Institutes for Desert Research (BIDR), Ben-Gurion University of the Negev, 84990 Midreshet Ben-Gurion (Israel); Pelicon, Primož, E-mail: primoz.pelicon@ijs.si [Jožef Stefan Institute, Jamova 39, SI-1000 Ljubljana (Slovenia)

    2013-07-01

    Diverse physiological, biochemical and morphological adaptations enable plants to survive in extreme saline environments where osmotic and ionic stresses limit growth and development. Halophytes are salt-tolerant plants that can withstand extraordinarily high levels of Na and Cl in their leaves. The tissue and cellular distribution patterns of salt ions can be linked to the underlying mechanisms of salt tolerance. Application of fast, reliable, multi-elemental and quantitative techniques such as micro-proton-induced X-ray emission (micro-PIXE) will significantly contribute to and accelerate studies of plant salt tolerance, especially as micro-PIXE also provides spatially resolved quantitative data for light elements, such as Na and Mg. The spatial concentration distributions of Na, Mg, Cl, K, P and S in leaves of four halophytes (Bassia indica, Atriplex prostrata, Spartina maritima and Limonium angustifolium) were determined using micro-PIXE, to study the salt-tolerance strategies of the selected halophytes. Different distribution patterns of the studied elements were seen in the leaves; however, in all four of these plant species, Na was excluded from photosynthetically active chlorophyl tissues. With the exception of L. angustifolium, Cl, P and S contents (representing chloride, phosphate and sulphate ionic forms, respectively) did not ensure charge balance in the leaves, which suggests other anionic compounds, such as nitrate and organic anions, have crucial roles in maintaining electroneutrality in these halophytes. By increasing soil salinisation worldwide, the possibility to reliably complement spatial distributions of Na, Mg, Cl, K, P and S with plant structural morphology will contribute significantly to our understanding of plant tolerance mechanisms at the tissue and cell levels. In addition, these kinds of studies are of particular value for designing crop plants with high salt tolerance and for the development of phytoremediation technologies.

  2. Accurate branching ratio measurements in 23Na(p,γ)24Mg

    International Nuclear Information System (INIS)

    Boydell, S.G.; Sargood, D.G.

    1975-01-01

    The reaction 23 Na(p,γ) 24 Mg has been investigated in the proton energy range 0.3-1.75 MeV. Gamma ray spectra were measured for 22 resonances with Ge(Li) detectors which were carefully calibrated for relative peak efficiencies. Allowance was made for the effect of anisotropies in all the emitted γ-rays. The spectra have been analysed to give branching ratios for bound and unbound levels. (author)

  3. Nuclear astrophysics with DRAGON at ISAC: the 21Na(p, γ)22Mg reaction

    International Nuclear Information System (INIS)

    D'Auria, J.M.

    2003-01-01

    The DRAGON facility at the new intense radioactive beams facility, ISAC, is now operational. It was built to perform studies of radiative alpha and proton capture reactions involving radioactive reactants, and of interest to nuclear astrophysics. The rate of the 21 Na(p, γ) 22 Mg reaction has been measured using inverse kinematics. Resonance strengths have been measured for states of importance for novae explosions. This report will summarize aspects of this study and its impact. (orig.)

  4. Hydrogen storage properties of Na-Li-Mg-Al-H complex hydrides

    International Nuclear Information System (INIS)

    Tang Xia; Opalka, Susanne M.; Laube, Bruce L.; Wu Fengjung; Strickler, Jamie R.; Anton, Donald L.

    2007-01-01

    Lightweight complex hydrides have attracted attention for their high storage hydrogen capacity. NaAlH 4 has been widely studied as a hydrogen storage material for its favorable reversible operating temperature and pressure range for automotive fuel cell applications. The increased understanding of NaAlH 4 has led to an expanded search for high capacity materials in mixed alkali and akali/alkaline earth alanates. In this study, promising candidates in the Na-Li-Mg-Al-H system were evaluated using a combination of experimental chemistry, atomic modeling, and thermodynamic modeling. New materials were synthesized using solid state and solution based processing methods. Their hydrogen storage properties were measured experimentally, and the test results were compared with theoretical modeling assessments

  5. Excitation processes in slow K+--He, Ne, Ar, H2, N2 and Na+--He collisions

    International Nuclear Information System (INIS)

    Kikiani, B.I.; Gochitashvili, M.R.; Kvizhinadze, R.V.; Ankudinov, V.A.

    1984-01-01

    Quasimolecular features of excitation processes in K + --He, Ne, Ar, H 2 , N 2 and Na + --He collisions were investigated by measuring the cross sections for the emission of the resonance lines of potassium (lambda = 766.5 and 769.9 nm), sodium (lambda = 589 and 589.6 nm), and helium (lambda = 584 nm) atoms at ion energies in the range 0.5--10 keV. In Na + --He collisions, the resonance-line excitation functions obtained for sodium and helium atoms exhibit oscillations that are in antiphase and are due to phase interference between the quasimolecular states of the system of colliding particles. Experimental data on K + --Ar collisions are interpreted in terms of schematic correlation diagrams for molecular orbitals. The excitation mechanisms for K + --N 2 and K + --Ar have beenfound to be similar, and this leads to the conclusion that the quasimolecular model used for the ion-atom case is also valid for the ion-molecule case. It is shown that the excitation of the 4p-state of the potassium atom in the K + --Ar case is due to a Landau-Zener type of interaction in the region of the quasicrossing of (KAr) + terms. Analysis of the excitation of this state in K + --N 2 collisions also shows that the capture of an electron into the excited 4p-state of the potassium atom is due to a nonadiabatic transition in the region of quasicrossing of energy terms of the same symmetry

  6. Interaction in the NaIn(MoO4)2 - AMoO4 (A = Mg, Mn) systems

    International Nuclear Information System (INIS)

    Kotova, I.Yu.; Kozhevnikova, N.M.

    2001-01-01

    The results of investigation into NaIn(MoO 4 ) 2 - AMoO 4 (A = Mg, Mn) quasibinary cross-sections by means of X-ray diffraction and differential thermal analysis are presented. Conducted researches revealed that compounds NaMg 3 In(MoO 4 ) and NaMn 3 In(MoO 4 ) melting incongruently at 990 Deg C and 940 Deg C accordingly were formed in the NaIn(MoO 4 ) - AMoO 4 (A = Mg, Mn) systems. The data of initiation of X-ray diffraction pattern of NaMg 3 In(MoO 4 ) 5 are presented. The temperature dependences of conductivity, dielectric permeability and tangent of dielectric losses indicative on ionic-electronic nature conductivity are determined. Activation energy of conductivity in the Mg - Mn row changes moderately - from 9.91 till 5.71 eV [ru

  7. VPLIV GOSPODARSKE IN FINANČNE KRIZE NA STRATEGIJO TRŽENJA PODJETJA NA MEDNARODNEM TRGU STAVBNEGA POHIŠTVA

    OpenAIRE

    Korpar, Daša

    2016-01-01

    Začetki gospodarske krize v letu 2008 imajo velik vpliv na gradbeno panogo. Dodana vrednost in proizvodnja sta se začeli občutno zmanjševati, kar je v letu 2009 povzročilo zmanjšanje bruto plač in števila zaposlenih. Močno krčenje v gradbeništvu je v letih 2010/2011 privedlo do stečaja dveh od treh največjih slovenskih gradbenih podjetij (SCT Ljubljana in Vegrad Velenje). Kljub težavam, ki jih je prinesla gospodarska kriza iz leta 2008, svet postaja vse bolj povezan in soodvisen. Sodobno svet...

  8. DEJAVNIKI ZDRAVSTVENEGA TVEGANJA NA DELOVNEM MESTU PATRONAŽNE MEDICINSKE SESTRE

    OpenAIRE

    Vratarič, Marija Sabrina

    2015-01-01

    Patronažno varstvo zajema izredno pestro simptomatiko in problematiko. Potrebe po patronažni zdravstveni negi se po napovedih še povečujejo. Trendi sodobne družbe usmerjajo oskrbo posameznika tako, da ostane v domačem okolju čim dlje aktiven, zdrav in sposoben samooskrbe. Več vrst nasilja, promet in vremenske razmere, pravočasnost informacij ter neprimerno delovno okolje so dejavniki tveganja, ki smo jih v naši magistrski nalogi izpostavili in se v raziskavi tudi izkažejo za obremenjujoč...

  9. Co-intercalation of Mg(2+) and Na(+) in Na(0.69)Fe2(CN)6 as a High-Voltage Cathode for Magnesium Batteries.

    Science.gov (United States)

    Kim, Dong-Min; Kim, Youngjin; Arumugam, Durairaj; Woo, Sang Won; Jo, Yong Nam; Park, Min-Sik; Kim, Young-Jun; Choi, Nam-Soon; Lee, Kyu Tae

    2016-04-06

    Thanks to the advantages of low cost and good safety, magnesium metal batteries get the limelight as substituent for lithium ion batteries. However, the energy density of state-of-the-art magnesium batteries is not high enough because of their low operating potential; thus, it is necessary to improve the energy density by developing new high-voltage cathode materials. In this study, nanosized Berlin green Fe2(CN)6 and Prussian blue Na(0.69)Fe2(CN)6 are compared as high-voltage cathode materials for magnesium batteries. Interestingly, while Mg(2+) ions cannot be intercalated in Fe2(CN)6, Na(0.69)Fe2(CN)6 shows reversible intercalation and deintercalation of Mg(2+) ions, although they have the same crystal structure except for the presence of Na(+) ions. This phenomenon is attributed to the fact that Mg(2+) ions are more stable in Na(+)-containing Na(0.69)Fe2(CN)6 than in Na(+)-free Fe2(CN)6, indicating Na(+) ions in Na(0.69)Fe2(CN)6 plays a crucial role in stabilizing Mg(2+) ions. Na(0.69)Fe2(CN)6 delivers reversible capacity of approximately 70 mA h g(-1) at 3.0 V vs Mg/Mg(2+) and shows stable cycle performance over 35 cycles. Therefore, Prussian blue analogues are promising structures for high-voltage cathode materials in Mg batteries. Furthermore, this co-intercalation effect suggests new avenues for the development of cathode materials in hybrid magnesium batteries that use both Mg(2+) and Na(+) ions as charge carriers.

  10. The kinetic and mechanistic aspects of the oxidative dehydrogenation of ethane over Li/Na/MgO catalysts

    NARCIS (Netherlands)

    Swaan, H.M.; Swaan, H.M.; Toebes, A.; Toebes, A.; van Ommen, J.G.; Seshan, Kulathuiyer; Ross, J.R.H.; Ross, J.R.H.

    1992-01-01

    Kinetic and mechanistic aspects of the oxidative dehydrogenation of ethane catalysed by Li/MgO and Li/Na/MgO have been investigated. Initial rate measurements at 600°C; revealed that the Li/MgO catalyst produced C2H4, CO2, CO and H2 by parallel reactions whereas the sodium-promoted catalyst produced

  11. $^{8}$Be, $^{12}$C, $^{16}$O, $^{20}$Ne, $^{24}$Mg, and $^{32}$S nuclei and alpha clustering within a generalized liquid drop model

    CERN Document Server

    Royer, G; Eudes, P

    2015-01-01

    The potential energy governing the shape and the entrance and decay channels of the 12 C, 16 O, 20 Ne, 24 Mg, and 32 S 4n-nuclei has been determined within a generalized liquid drop model. Different three-dimensional and planar shapes have been investigated: linear chain, triangle, square, tetrahedron, pentagon, trigonal bipyramid, square pyramid, hexagon, octahedron, octogon and cube. The rms radii of the linear chains are higher than the experimental rms radii of the ground states. The binding energies of the planar shapes at the contact point are lower than the ones of the three-dimensional configurations. The a particle plus A-4 daughter configuration leads always to the lowest potential barrier relatively to the sphere configuration.

  12. Determination of Na, Cl, Ca, Mg, Mn and K in milk samples by activation analysis

    International Nuclear Information System (INIS)

    Kira, Carmen S.; Maihara, Vera A.

    2000-01-01

    In the present work cow milk samples distributed for Sao Paulo government institutions, by means of the 'Viva leite' programme, have been monitored. The concentrations of Ca, Cl, K, Mg, Mn and Na were determined in five milk samples and in three different kinds of commercial powder milk, by instrumental neutron activation. For quality control, the reference materials NIST whole milk powder and non fat milk powder were analysed. The results obtained are in the range of the concentrations mentioned in the literature for these elements. (author)

  13. Asymmetric fission of 47V induced by the 23Na+24Mg reaction

    International Nuclear Information System (INIS)

    Beck, C.; Djerroud, B.; Haas, F.; Freeman, R.M.; Hachem, A.; Heusch, B.; Morsad, A.; Vuillet-A-Cilles, M.; Sanders, S.J.

    1993-01-01

    The properties of fully energy-damped processes (deep-inelastic orbiting, fusion-evaporation, and fusion-fission processes) have been investigated in the nearly mass-symmetric entrance-channel 23 Na + 24 Mg reaction leading to the 47 V compound nucleus. By comparison with previous data for the mass-asymmetric 35 Cl + 12 C reaction forming the same compound system at the same excitation energy, no entrance-channel effects are observed in either the evaporation residue or the fusion-fission yields. This is in contrast to the situation with the 28 Si + 12 C and 24 Mg + 16 O reactions where an orbiting process is evident. The asymmetrical elemental distributions of the fusion-fission fragments of the massA=47 system are well described by a transition-state model that accounts for the spin and mass-asymmetry dependence of the fission saddle point

  14. Determination of the Cl, Mg, Mn and Na, in samples of Tradescantia pallida

    International Nuclear Information System (INIS)

    Rossi, Joao Guilherme G.A.; Saiki, Mitiko

    2009-01-01

    The growing number of industries and automotive vehicles are causing the increase of the air pollution. Less expensive methodologies are been studying for the evaluation of these pollution levels. This work evaluates the concentrations of Cl, Mg, Mn and Na, present in the leaves of Tradescantia pallida viewing validation of the specie for use in the bio monitoring of the air pollution. Those leaves were collected and analysed using the short irradiation of the neutron activation analysis technique. The certified reference material INCT-MPH-2 Mixed Polish Herbs were analysed for the quality control of the results and presented very good accuracy, with relative errors less than 4.2 %, and good precision less than 8.7 %. The element concentrations (in μg g -1 ) obtained in the T. pallida samples analysed showed variation from 2324 to 33897 for Cl, from 3602 to 14450 for Mg, from 132 to 314 for Mn, and 21 to 615 for Na. Values obtained in the analyses of Tradescantia present great variability in the element concentrations. The short irradiation showed to be appropriated for determination of the elements studied in the bio monitoring of air pollution

  15. Ionic Conductivity of the Perovskites, NaMgF3MgF3 and KZnF3 at High Temperatures

    DEFF Research Database (Denmark)

    Andersen, N. H.; Kjems, Jørgen; Hayes, W.

    1985-01-01

    We have carried out a study of the ionic conductivity of NaMgF3, KMgF3 and KZnF3 up to temperatures close to the melting point. Our results, in contrast to previous reports in the literature, show no abnormal ionic conductivity at high temperatures. Care in interpretation of results is required...... because of surface electronic conduction....

  16. Structure of formations on the NaCl monocrystal surface following simultaneous irradiation of it by hydrocarbon molecule flow and Ne/sup +/ ion beam

    Energy Technology Data Exchange (ETDEWEB)

    Derevyanchenko, A S; Palatnik, L S; Martynov, I S; Seryugin, A L; Gritsyna, V V; Koval' , A G; Kiyan, T S; Fogel' , Ya M [Khar' kovskii Gosudarstvennyi Univ. (Ukrainian SSR)

    1975-07-01

    The structure of a film growing on the surface of NaCl crystal with a simultaneous irradiation of the film with molecules of hydrocarbons and Ne ions has been investigated. At the first stage of formation the film has a net structure of graphite with an abnormally large internet distance. At the subsequent stage of growing hollow spherulites are formed in the film, their walls having the structure of the third phase of carbon - carbine and dendrites - crystals with the structure of NaCl forming inside of the growing film.

  17. Passivation kinetics of Mg-Nd-Gd-Zn-Zr (EV31A and Mg-Y-Nd-Gd-Zr (WE43C in NaOH solutions

    Directory of Open Access Journals (Sweden)

    Jakraphan Ninlachart

    2017-09-01

    Full Text Available Passivation kinetics of two Mg-RE alloys, such as Mg-Nd-Gd-Zn-Zr (EV31A, and Mg-Y-Nd-Gd-Zr (WE43C were investigated in two different heat treated conditions (solution treated and overaged in 0.01 - 1.0 M NaOH solutions under potentiostatic conditions. Negative reaction order was observed in dilute NaOH which transitioned to positive values as the passivation time increased and in the 1 M NaOH as well. The passive layers showed platelet morphology and the size of the platelets decreased with increase in the NaOH concentration. The hydrogen evolution reaction (HER kinetics was not improved on the passive layer covered surface of the Mg-RE alloys in contrast to the improvements reported on the hydroxide covered pure magnesium. The electrochemical impedance increased with increase in the NaOH concentration in the solution treated condition of both Mg-RE alloys, whereas the overaged EV31A alloy showed a reverse trend. The passive layer of EV31A showed almost 100% higher charge carrier density than the film formed on the WE43C in the overaged condition. A better passivation behavior was observed in the solution treated condition than that in the overaged condition which could be attributed to the uniform distribution of the RE elements in the solution treated specimens. The WE43C alloy revealed better corrosion resistance in the alkaline solution than the EV31A alloy.

  18. Complex transition metal hydrides incorporating ionic hydrogen: Synthesis and characterization of Na{sub 2}Mg{sub 2}FeH{sub 8} and Na{sub 2}Mg{sub 2}RuH{sub 8}

    Energy Technology Data Exchange (ETDEWEB)

    Humphries, Terry D., E-mail: terry_humphries81@hotmail.com [WPI-Advanced Institute for Materials Research, Tohoku University, Sendai 980-8577 (Japan); Takagi, Shigeyuki; Li, Guanqiao; Matsuo, Motoaki; Sato, Toyoto [Institute for Materials Research, Tohoku University, Sendai 980-8577 (Japan); Sørby, Magnus H.; Deledda, Stefano; Hauback, Bjørn C. [Physics Department, Institute for Energy Technology, Kjeller NO-2027 (Norway); Orimo, Shin-ichi [WPI-Advanced Institute for Materials Research, Tohoku University, Sendai 980-8577 (Japan); Institute for Materials Research, Tohoku University, Sendai 980-8577 (Japan)

    2015-10-05

    Highlights: • Structures of Na{sub 2}Mg{sub 2}FeH{sub 8} and Na{sub 2}Mg{sub 2}RuH{sub 8} have been determined by XRD and PND. • Compounds incorporate independently coordinated ionic and covalent hydrogen. • [TH{sub 6}]{sup 4−} anion is surrounded by a cubic array of four Mg{sup 2+} and four Na{sup +} cations. • H{sup −} anions are octahedrally coordinated by four Na{sup +} and two Mg{sup 2+} cations. • Vibrational modes of the H{sup −} anions and complex hydride anion are observed. - Abstract: A new class of quaternary complex transition metal hydrides (Na{sub 2}Mg{sub 2}TH{sub 8} (T = Fe, Ru)) have been synthesized and their structures determined by combined synchrotron radiation X-ray and powder neutron diffraction. The compounds can be considered as a link between ionic and complex hydrides in terms of incorporating independently coordinated ionic and covalent hydrogen. These novel isostructural complex transition metal hydrides crystallize in the orthorhombic space group Pbam, where the octahedral complex hydride anion is surrounded by a cubic array of four Mg{sup 2+} and four Na{sup +} cations, forming distinct two-dimensional layers. An intriguing feature of these materials is the distorted octahedral coordination of the isolated H{sup −} anions by four Na{sup +} and two Mg{sup 2+} cations, which form layers between the transition metal containing layers. The vibrational modes of the H{sup −} anions and complex hydride anion are independently observed for the first time in a quaternary complex transition metal hydride system by Raman and IR spectroscopy.

  19. ELLERMAN BOMBS AT HIGH RESOLUTION. IV. VISIBILITY IN Na I AND Mg I

    Energy Technology Data Exchange (ETDEWEB)

    Rutten, R. J.; Rouppe van der Voort, L. H. M.; Vissers, G. J. M., E-mail: R.J.Rutten@uu.nl [Institute of Theoretical Astrophysics, University of Oslo, P.O. Box 1029, Blindern, N-0315 Oslo (Norway)

    2015-08-01

    Ellerman bombs are transient brightenings of the wings of the solar Balmer lines that mark reconnection in the photosphere. Ellerman noted in 1917 that he did not observe such brightenings in the Na i D and Mg i b lines. This non-visibility should constrain EB interpretation, but has not been addressed in published bomb modeling. We therefore test Ellerman’s observation and confirm it using high-quality imaging spectrometry with the Swedish 1-m Solar Telescope. However, we find a diffuse brightness in these lines that seems to result from prior EBs. We tentatively suggest this is a post-bomb hot-cloud phenomenon also found in recent EB spectroscopy in the ultraviolet.

  20. Interactions of Na+, K+, Mg2+, and Ca 2+ with benzene self-assembled monolayers

    DEFF Research Database (Denmark)

    Pedersen, Morten Rimmen; Matthiesen, Jesper; Bovet, Nicolas Emile

    2014-01-01

    that are most common in the natural world, namely, Na+, K+, Mg 2+, and Ca2+. Specifically, we investigated how these ions affect the interactions between surfaces covered by self-Assembled monolayers (SAMs) terminated with benzene molecules. We used a flat oxidized silicon substrate and an atomic force...... from X-ray photoelectron spectroscopy (XPS) allowed us to conclude that K+ binds in the benzene layers, creating a positive surface charge on the benzene-covered surfaces, thus leading to lower adhesion in KCl solutions than in pure water. Evidence suggested that Ca2+ does not bind to the surfaces...... measurements. The results of our studies clearly show that even a nonpolar, hydrophobic molecule, such as benzene, has a role to play in the behavior of aqueous solutions and that it interacts differently depending on which ions are present. Even ions from the same column in the periodic table behave...

  1. Chemistry of Frozen NaCl and MgSO4 Brines - Implications for Surface Expression of Europa's Ocean Composition

    Science.gov (United States)

    Johnson, P. V.; Hodyss, R. P.; Choukroun, M.; Vu, T. H.

    2015-12-01

    The composition of Europa's subsurface ocean is a critical determinant of its habitability, but current analysis of the ocean composition is limited to its expression on the Europan surface. While there is observational evidence indicating that ocean materials make their way to the surface, our understanding of the chemical processes that can alter this material under Europan surface conditions is limited. We present experimental data on the chemistry of mixed solutions of NaCl and MgSO4 as they are frozen to 100 K, replicating the conditions that may occur when subsurface ocean fluids are emplaced onto Europa's surface. Confocal micro-Raman spectroscopy is used to study the formation of salts during the freezing process, and the interaction of ions in the frozen brines. Our data indicate that mixed aqueous solutions of NaCl and MgSO4 form Na2SO4 and MgCl2 preferentially when frozen, rather than making NaCl and MgSO4 precipitates. The detection of epsomite (MgSO4Ÿ•7H2O) on Europa's surface may therefore imply an ocean composition relatively low in sodium, unless radiolytic chemistry converts MgCl2 to MgSO4 as suggested by Hand and Brown 2013 (ApJ 145 110). These results have important implications for the interpretation of remote sensing data of Europa's surface.

  2. Ocorrência de insetos na pitaia no município de Lavras-MG

    Directory of Open Access Journals (Sweden)

    Virna Braga Marques

    2012-04-01

    Full Text Available Devido às suas características de sabor doce e suave, polpa firme e repleta de sementes com ação laxante, as pitaias têm despertado interesse nos produtores por sua grande aceitação nos mercados consumidores. Diante do exposto, este trabalho visou identificar os visitantes florais, polinizadores e os insetos que causam danos aos cladódios e aos frutos de pitaia (Hylocereus undatus, no município de Lavras, MG. O trabalho foi conduzido em um pomar experimental e na coleção de frutas exóticas. As coletas foram realizadas duas etapas (diurna e noturna. Foi observado que a polinização cruzada de pitaia é realizada por abelha (Apis mellifera durante o dia e os insetos que causam maiores danos são formigas (Atta e Solenopsis e irapuá (Trigona spinipes no município de Lavras, MG.  É necessário que o produtor tenha cautela antes de utilizar medidas de controle, pois alguns insetos são benéficos para a polinização cruzada das plantas de pitaia e outros podem causar sérios danos nos cladódios, flores e frutos.

  3. Melting Behavior and Thermolysis of NaBH4−Mg(BH42 and NaBH4−Ca(BH42 Composites

    Directory of Open Access Journals (Sweden)

    Morten B. Ley

    2015-04-01

    Full Text Available The physical properties and the hydrogen release of NaBH4–Mg(BH42 and NaBH4−Ca(BH42 composites are investigated using in situ synchrotron radiation powder X-ray diffraction, thermal analysis and temperature programmed photographic analysis. The composite, xNaBH4–(1 − xMg(BH42, x = 0.4 to 0.5, shows melting/frothing between 205 and 220 °C. However, the sample does not become a transparent molten phase. This behavior is similar to other alkali-alkaline earth metal borohydride composites. In the xNaBH4–(1 − xCa(BH42 system, eutectic melting is not observed. Interestingly, eutectic melting in metal borohydrides systems leads to partial thermolysis and hydrogen release at lower temperatures and the control of sample melting may open new routes for obtaining high-capacity hydrogen storage materials.

  4. Distribution of major elements (Na, K, Ca, Mg in the various anatomical parts of Fadama crops in Ekiti State, Nigeria

    Directory of Open Access Journals (Sweden)

    E.I. Adeyeye

    2005-12-01

    Full Text Available Levels of sodium, potassium, calcium and magnesium were determined in plant organs (bud, flowers, fruit, seed, leaves, stems, roots, cobs, styles, shaft, grains and efflorescences of three Fadama farms located in Ifaki-Ekiti, Ado-Ekiti and Ikere-Ekiti of Ekiti State, Nigeria. The highest levels of Mg, K, Na and Ca were obtained in the bud of Hibiscus esculentus with respective values (ppm dry weight, ppm DW of 4397, 2983, 3928 and 1622; this was closely followed by their levels in Lycopersicon esculentum root: Mg (2734, K (1079, Na (2111 and Ca (678. The levels of all the elements were highly varied in the anatomical parts of each plant and between the various plants. The index of bioaccumulation (ratio in plants/soil was recorded for all the elements with all values falling within 1-101 showing that the degree of accumulation was intensive. The overall levels of the elements were Mg > Na > K > Ca.

  5. Growth, structure and magnetic properties of FePt nanostructures on NaCl(001) and MgO(001)

    International Nuclear Information System (INIS)

    Liscio, F; Maret, M; Doisneau-Cottignies, B; Makarov, D; Albrecht, M; Roussel, H

    2010-01-01

    A comparison of the structural and magnetic properties of FePt nanostructures grown at different temperatures on NaCl(001) and MgO(001) substrates is presented. A strong influence of the deposition temperature on the epitaxial growth as well as on the size distribution of FePt nanostructures grown on NaCl substrates is observed. In spite of a large lattice mismatch between FePt and NaCl, a 'cube-over-cube' growth of nanostructures with a narrow size distribution was achieved at 520 K. Moreover, the growth of FePt nanostructures on NaCl(001) is not preceded by the formation of a wetting layer as observed on MgO(001). The higher degree of L1 0 chemical ordering in FePt nanostructures grown on MgO(001) accompanied by the absence of L1 0 variants with an in-plane tetragonal c-axis indicates that the tensile epitaxial stress induced by the MgO substrate is a key factor in the formation of the L1 0 phase with an out-of-plane c-axis. Superparamagnetic behavior is revealed for the FePt nanostructures grown on NaCl(001) due to their small size and relatively poor chemical order.

  6. Reversible hydrogen storage by NaAlH4 confined within a titanium-functionalized MOF-74(Mg) nanoreactor.

    Science.gov (United States)

    Stavila, Vitalie; Bhakta, Raghunandan K; Alam, Todd M; Majzoub, Eric H; Allendorf, Mark D

    2012-11-27

    We demonstrate that NaAlH(4) confined within the nanopores of a titanium-functionalized metal-organic framework (MOF) template MOF-74(Mg) can reversibly store hydrogen with minimal loss of capacity. Hydride-infiltrated samples were synthesized by melt infiltration, achieving loadings up to 21 wt %. MOF-74(Mg) possesses one-dimensional, 12 Å channels lined with Mg atoms having open coordination sites, which can serve as sites for Ti catalyst stabilization. MOF-74(Mg) is stable under repeated hydrogen desorption and hydride regeneration cycles, allowing it to serve as a "nanoreactor". Confining NaAlH(4) within these pores alters the decomposition pathway by eliminating the stable intermediate Na(3)AlH(6) phase observed during bulk decomposition and proceeding directly to NaH, Al, and H(2), in agreement with theory. The onset of hydrogen desorption for both Ti-doped and undoped nano-NaAlH(4)@MOF-74(Mg) is ∼50 °C, nearly 100 °C lower than bulk NaAlH(4). However, the presence of titanium is not necessary for this increase in desorption kinetics but enables rehydriding to be almost fully reversible. Isothermal kinetic studies indicate that the activation energy for H(2) desorption is reduced from 79.5 kJ mol(-1) in bulk Ti-doped NaAlH(4) to 57.4 kJ mol(-1) for nanoconfined NaAlH(4). The structural properties of nano-NaAlH(4)@MOF-74(Mg) were probed using (23)Na and (27)Al solid-state MAS NMR, which indicates that the hydride is not decomposed during infiltration and that Al is present as tetrahedral AlH(4)(-) anions prior to desorption and as Al metal after desorption. Because of the highly ordered MOF structure and monodisperse pore dimensions, our results allow key template features to be identified to ensure reversible, low-temperature hydrogen storage.

  7. On the roles of the dopants in LiF: Mg,Cu,Na,Si thermoluminescent material

    International Nuclear Information System (INIS)

    Lee, J. I.; Kim, J. L.; Chang, S. Y.; Chung, K. S.; Choe, H. S.

    2005-01-01

    In this paper, some results of the study on the roles of the dopants in the LiF:Mg,Cu,Na,Si thermoluminescent (TL) material that was developed at the Korea Atomic Energy Research Inst. for radiation protection are presented. Although there have been many studies to investigate the roles of the dopants in LiF:Mg,Cu,P TL material in the TL process, there are some discrepancies in the understanding of the roles of Cu and P between various researchers. In case of LiF:Mg,Cu,Na,Si TL material, there are a few studies on the roles of the dopants. Three kinds of samples in each of which one dopant is excluded, and the optimised sample, were prepared for this study. The measurements and analysis of the three-dimensional TL spectra, based on the temperature, wavelength and intensity, and the glow curves for those samples are used in this study. The results show that Mg plays a role in the trapping of the charge carriers and Cu plays a role in the luminescence recombination process; however, the effect of Na and Si on the glow curve structure and the TL emission spectra is much less than that of Mg and Cu. It is considered that Na and Si each plays a role in the improvement of the luminescence efficiency. (authors)

  8. Q value of the superallowed decay of 22Mg and the calibration of the 21Na(p,γ) experiment

    International Nuclear Information System (INIS)

    Savard, G.; Clark, J.A.; Wang, J.C.; Buchinger, F.; Crawford, J.E.; Gulick, S.; Lee, J.K.P.; Hardy, J.C.; Iacob, V.E.; Hecht, A.A.; Levand, A.F.; Lundgren, B.F.; Scielzo, N.D.; Tanihata, I.; Trimble, W.; Zhou, Z.; Sharma, K.S.; Wang, Y.; Towner, I.S.

    2004-01-01

    The masses of the radioactive nuclei 22 Mg and 22 Na have been measured with the Canadian Penning trap on-line mass spectrometer to a precision of 3x10 -8 and 1x10 -8 , respectively. A Q EC value of 4124.39(73) keV for the superallowed β decay of 22 Mg is obtained from the difference of these two masses. With this precise Q value, the Ft value for this decay is determined with improved precision and is found to be consistent with the existing precision data set of superallowed Fermi emitters. This provides an important test of the isospin symmetry-breaking corrections. If the mass of 22 Mg determined here is used in the calibration of a recent 21 Na(p,γ) 22 Mg measurement, part of the discrepancy observed in that measurement is removed

  9. Non-specific binding of Na+ and Mg2+ to RNA determined by force spectroscopy methods

    Science.gov (United States)

    Bizarro, C. V.; Alemany, A.; Ritort, F.

    2012-01-01

    RNA duplex stability depends strongly on ionic conditions, and inside cells RNAs are exposed to both monovalent and multivalent ions. Despite recent advances, we do not have general methods to quantitatively account for the effects of monovalent and multivalent ions on RNA stability, and the thermodynamic parameters for secondary structure prediction have only been derived at 1M [Na+]. Here, by mechanically unfolding and folding a 20 bp RNA hairpin using optical tweezers, we study the RNA thermodynamics and kinetics at different monovalent and mixed monovalent/Mg2+ salt conditions. We measure the unfolding and folding rupture forces and apply Kramers theory to extract accurate information about the hairpin free energy landscape under tension at a wide range of ionic conditions. We obtain non-specific corrections for the free energy of formation of the RNA hairpin and measure how the distance of the transition state to the folded state changes with force and ionic strength. We experimentally validate the Tightly Bound Ion model and obtain values for the persistence length of ssRNA. Finally, we test the approximate rule by which the non-specific binding affinity of divalent cations at a given concentration is equivalent to that of monovalent cations taken at 100-fold concentration for small molecular constructs. PMID:22492710

  10. Isopiestic Investigation of the Osmotic and Activity Coefficients of {yMgCl2 + (1 - y)MgSO4}(aq) and the Osmotic Coefficients of Na2SO4.MgSO4(aq) at 298.15 K

    Energy Technology Data Exchange (ETDEWEB)

    Miladinovic, J; Ninkovic, R; Todorovic, M; Rard, J A

    2007-06-06

    Isopiestic vapor pressure measurements were made for {l_brace}yMgCl{sub 2} + (1-y)MgSO{sub 4}{r_brace}(aq) solutions with MgCl{sub 2} ionic strength fractions of y = 0, 0.1997, 0.3989, 0.5992, 0.8008, and (1) at the temperature 298.15 K, using KCl(aq) as the reference standard. These measurements for the mixtures cover the ionic strength range I = 0.9794 to 9.4318 mol {center_dot} kg{sup -1}. In addition, isopiestic measurements were made with NaCl(aq) as reference standard for mixtures of {l_brace}xNa{sub 2}SO{sub 4} + (1-x)MgSO{sub 4}{r_brace}(aq) with the molality fraction x = 0.50000 that correspond to solutions of the evaporite mineral bloedite (astrakanite), Na{sub 2}Mg(SO{sub 4}){sub 2} {center_dot} 4H{sub 2}O(cr). The total molalities, m{sub T} = m(Na{sub 2}SO{sub 4}) + m(MgSO{sub 4}), range from m{sub T} = 1.4479 to 4.4312 mol {center_dot} kg{sup -1} (I = 5.0677 to 15.509 mol {center_dot} kg{sup -1}), where the uppermost concentration is the highest oversaturation molality that could be achieved by isothermal evaporation of the solvent at 298.15 K. The parameters of an extended ion-interaction (Pitzer) model for MgCl2(aq) at 298.15 K, which were required for an analysis of the {l_brace}yMgCl{sub 2} + (1-y)MgSO{sub 4}{r_brace}(aq) mixture results, were evaluated up to I = 12.025 mol {center_dot} kg{sup -1} from published isopiestic data together with the six new osmotic coefficients obtained in this study. Osmotic coefficients of {l_brace}yMgCl{sub 2} + (1-y)MgSO{sub 4}{r_brace}(aq) solutions from the present study, along with critically-assessed values from previous studies, were used to evaluate the mixing parameters of the extended ion-interaction model.

  11. Equilibrium between (Li,Na,K,Mg)-carbonate melt, gaseous CO

    NARCIS (Netherlands)

    Velden, P.F. van

    1967-01-01

    Considerable amounts of MgCO3 may appear in alkali metal carbonate melts in contact with MgO and carbon dioxide gas. The equilibrium between dissolved MgCO3, MgO and carbon dioxide gas has been studied. The results satisfactorily obey thermodynamic theory based upon a melt

  12. The Improvement of Dehydriding the Kinetics of NaMgH3 Hydride via Doping with Carbon Nanomaterials

    Directory of Open Access Journals (Sweden)

    Zhong-Min Wang

    2016-12-01

    Full Text Available NaMgH3 perovskite hydride and NaMgH3–carbon nanomaterials (NH-CM composites were prepared via the reactive ball-milling method. To investigate the catalytic effect of CM on the dehydriding kinetic properties of NaMgH3 hydride, multiwall carbon nanotubes (MWCNTs and graphene oxide (GO were used as catalytic additives. It was found that dehydriding temperatures and activation energies (ΔE1 and ΔE2 for two dehydrogenation steps of NaMgH3 hydride can be greatly reduced with a 5 wt. % CM addition. The NH–2.5M–2.5G composite presents better dehydriding kinetics, a lower dehydriding temperature, and a higher hydrogen-desorbed amount (3.64 wt. %, 638 K. ΔE1 and ΔE2 can be reduced by about 67 kJ/mol and 30 kJ/mol, respectively. The results suggest that the combination of MWCNTs and GO is a better catalyst as compared to MWCNTs or GO alone.

  13. Biti ili ne biti žena? Percepcija visokoobrazovanih žena o rodnoj jednakosti na radnom mjestu

    OpenAIRE

    Pološki Vokić, Nina; Sinčić Ćorić, Dubravka; Obadić, Alka

    2017-01-01

    Polazišna točka rada je da visokoobrazovane žene trpe manje nejednakosti na radnom mjestu. Kako bismo to testirali, provedena su primarna i sekundarna istraživanja. Sekundarni podatci odnose se na područje obrazovanja, sudjelovanje u aktivnostima koje se temelje na znanju, statusu u hijerarhiji i razlici u plaćama visokoobrazovanih žena u odnosu na plaće muškaraca u odabranim europskim zemljama, dok primarni podatci prikazuju percepcije visokoobrazovanih žena o kontekstualnim čimbenicima koji...

  14. NaNet3: The on-shore readout and slow-control board for the KM3NeT-Italia underwater neutrino telescope

    Directory of Open Access Journals (Sweden)

    Ammendola R.

    2016-01-01

    Full Text Available The KM3NeT-Italia underwater neutrino detection unit, the tower, consists of 14 floors. Each floor supports 6 Optical Modules containing front-end electronics needed to digitize the PMT signal, format and transmit the data and 2 hydrophones that reconstruct in real-time the position of Optical Modules, for a maximum tower throughput of more than 600 MB/s. All floor data are collected by the Floor Control Module (FCM board and transmitted by optical bidirectional virtual point-to-point connections to the on-shore laboratory, each FCM needing an on-shore counterpart as communication endpoint. In this contribution we present NaNet3, an on-shore readout board based on Altera Stratix V GX FPGA able to manage multiple FCM data channels with a capability of 800 Mbps each. The design is a NaNet customization for the KM3NeT-Italia experiment, adding support in its I/O interface for a synchronous link protocol with deterministic latency at physical level and for a Time Division Multiplexing protocol at data level.

  15. NaNet3: The on-shore readout and slow-control board for the KM3NeT-Italia underwater neutrino telescope

    Science.gov (United States)

    Ammendola, R.; Biagioni, A.; Frezza, O.; Lo Cicero, F.; Martinelli, M.; Paolucci, P. S.; Pontisso, L.; Simula, F.; Vicini, P.; Ameli, F.; Nicolau, C. A.; Pastorelli, E.; Simeone, F.; Tosoratto, L.; Lonardo, A.

    2016-04-01

    The KM3NeT-Italia underwater neutrino detection unit, the tower, consists of 14 floors. Each floor supports 6 Optical Modules containing front-end electronics needed to digitize the PMT signal, format and transmit the data and 2 hydrophones that reconstruct in real-time the position of Optical Modules, for a maximum tower throughput of more than 600 MB/s. All floor data are collected by the Floor Control Module (FCM) board and transmitted by optical bidirectional virtual point-to-point connections to the on-shore laboratory, each FCM needing an on-shore counterpart as communication endpoint. In this contribution we present NaNet3, an on-shore readout board based on Altera Stratix V GX FPGA able to manage multiple FCM data channels with a capability of 800 Mbps each. The design is a NaNet customization for the KM3NeT-Italia experiment, adding support in its I/O interface for a synchronous link protocol with deterministic latency at physical level and for a Time Division Multiplexing protocol at data level.

  16. Estudo etnobotânico de plantas medicinais na comunidade de Santa Rita, Ituiutaba – MG

    Directory of Open Access Journals (Sweden)

    Juliana Aparecida Povh

    2013-07-01

    Full Text Available http://dx.doi.org/10.5007/2175-7925.2013v26n3p231 O objetivo deste artigo foi inventariar as plantas utilizadas na medicina popular pelos membros da comunidade rural de Santa Rita, no município de Ituiutaba - MG. A avaliação foi realizada por meio de entrevistas, com um questionário semiestruturado, e posterior coleta das plantas indicadas pelos informantes. Foram realizadas 47 entrevistas e 127 espécies foram listadas, pertencentes a 55 famílias de Angiospermas. Para obtenção dos dados quantitativos foi calculada a porcentagem de Concordância de Usos Principais (CUP de cada espécie; para identificar as indicações terapêuticas de maior importância, utilizou-se o Fator de Consenso dos Informantes (FCI. A CUP demonstrou que 5,5% das plantas citadas são amplamente utilizadas pela comunidade. As famílias botânicas predominantes foram Lamiaceae e Asteraceae, com 14 e 13 registros, respectivamente. A indicação de uso predominante envolveu, principalmente, afecções relacionadas a distúrbio emocional, conforme indicado pelo FCI. Salienta-se que 60,7% das plantas citadas neste artigo são espécies exóticas; desse modo, se faz necessário mais estudos para catalogar o conhecimento sobre as plantas medicinais nativas dessa região.

  17. Exigências de minerais para cabras durante a gestação: Na, K, Mg, S, Fe e Zn Minerals requirements of goats during the pregnancy: Na, K, Mg, S, F and Zn

    Directory of Open Access Journals (Sweden)

    Roberto Germano Costa

    2003-04-01

    Full Text Available O trabalho foi realizado com o objetivo de estimar a retenção e a exigência líquida dos minerais Na, K, Mg, S, Fe e Zn durante a gestação de cabras com um ou dois fetos. A estimativa de retenção foi baseada na diferença entre o total de cada mineral depositado no feto, útero, membranas, fluídos fetais e glândula mamária dos animais nas diferentes etapas da gestação e o total de cada mineral armazenado nas cabras vazias, utilizando-se o modelo de predição ln=A+Bx+Cx2, em que x=tempo de gestação. Os conteúdos de Na, K, Mg, S, Fe e Zn, durante as gestações de um e dois fetos foram de: 13,2 e 21,4 mg; 13,3 e 21,3 g; 2,1 e 3,7 mg; 5,5 e 9,3 mg; 575,5 e 981,0 mg; 112,6 e 164,7 mg nas gestações, resultando em exigências líquidas diárias de 0,13 e 0,11 g; 0,21 e 0,31 g; 0,06 e 0,11g; 0,17 e 0,21 g; 22,94 e 40,51 mg; 2,63 e 2,78 mg, respectivamente.This work was carried out with the purpose of evaluating the retention and the requirement of Ca e P minerals during the pregnancy of goats with one or two foetus. The estimate of retention was based in the difference between the total of each mineral stored in the foetus, uterus, membranes, fetals fluids and mammary gland of animals in the differents phases of pregnancy and the total of each mineral stored in the empty goats, using the model of prediction ln=A+Bx+Cx2, where x=time of pregnancy. The comparison of the estimative with the real values obtained show that the suggested model explained with coherence and precision the biological behavior of minerals retention during all pregnancy. The contend of Na, K, Mg, S, Fe e Zn was: 13.2 and 21.4 mg; 13.3 and 21.3 g; 2.1 and 3.7 mg; 5.5 and 9.3 mg; 575.5 and 981.0 mg; 112.6 and 164.7 mg in the pregnancy of one and two foetus, respectively, that resulted in a diary liquid requirement of 0.13 and 0.11 g; 0.21 and 0.31 g 0.06 and 0.11g; 0.17 and 0.21 g; 22.94 and 40.51 mg; 2.63 and 2.78 mg, respectively.

  18. Phase formation in Na2MoO4 - MgMoO4 - Cr2(MoO4)3 system

    International Nuclear Information System (INIS)

    Kotova, I.Yu.; Kozhevnikova, N.M.

    1998-01-01

    Interaction within Na 2 MoO 4 - MgMoO 4 - Cr 2 (MoO 4 ) 3 ternary system is studied by X ray phase and DTA methods. State diagram of NaCr(MoO 4 ) 2 - MgMoO 4 section is plotted. Production of ternary molybdates of Na 1-x Mg 1-x Cr 1+x (MoO 4 ) 3 , where 0 ≤ x ≤ 0.3, and NaMg 3 Cr(MoO 4 ) 5 composition is ascertained [ru

  19. Separation of reaction mechanisms at low energy. Study of the reactions: 27Al(d,p) 28Al, 24Mg(d,p) 25Mg, and 24Mg(d, α) 22Na

    International Nuclear Information System (INIS)

    Mermaz, M.

    1966-06-01

    The two sets of angular distributions of (d,p) reactions on Al and Mg, measured between 2 and 6 MeV, have given the possibility to test, in analysing the statistical fluctuations of cross-section, the validity of the separation of their mean values in two parts, one 'direct', another given by the statistical mechanism. With the same method of analysis we have studied excitation functions for several alpha groups of the reaction 24 Mg(d, α) 22 Na and given an evidence for an intermediate structure for the alpha channel leading to the 3. excited state of 22 Na. The angular distribution of the wide resonance at 15.9 MeV in 26 Al has been obtained. (author) [fr

  20. Thermodynamic of hydration of a Wyoming montmorillonite saturated with Ca, Mg, Na and K

    International Nuclear Information System (INIS)

    Vieillard, P.; Blanc, P.; Gailhanou, H.; Gaboreau, S.; Giffaut, E.

    2010-01-01

    enthalpy of immersion, and isotherms of adsorption - desorption has been done for Wyoming montmorillonite saturated by Mg 2+ , Ca 2+ , Na + and K + . Smectite water-vapor pressure isotherms represent the total concentration of H 2 O taken up the sample which is distributed among the interlayers, the outer surfaces of particles and the open pore space in the sample. In order to retrieve standard state thermodynamic properties for smectite hydration and dehydration from such data, the amount of H 2 O in excess of that in the interlayer must be assessed and subtracted from the total amount taken up by the clay sample. Berend et al. (1995), Cases et al. (1992, 1997) provide careful measurements of recovering waters in both processes (hydration and dehydration) on Wyoming saturated by monovalent and divalent cations. Despite the fact that neither the hydration, nor the dehydration isotherm necessarily represents the equilibrium state of the system, the two isotherms together can be considered to bracket the equilibrium values of Xhs and the activity of H 2 O. Paired hydration and dehydration isotherm in the one hand and enthalpy of immersion in the other hand, which constitute the limits of these brackets can be regressed to assess standard state thermodynamic parameters (enthalpy and entropy) for the hydration- dehydration process. Experimental enthalpies of hydration are used in the determination of ΔH deg. hyd. W H1 and W H2 by the minimization technique. For the adsorption-desorption isotherms, the determination of parameters ΔS deg. hyd. W S1 and W S2 are obtained by minimizing the difference between measured sets of data (relative humidity and number of adsorbed interlayer water) and calculated ones. For each Wyoming saturated with one cation, six parameters are requested and characterize the standard state thermodynamic properties of hydration between smectite and interlayer H 2 O. Relations between hydration parameters ΔH deg. hyd. and ΔS deg. hyd. in the one hand

  1. Separation of reaction mechanisms at low energy. Study of the reactions: {sup 27}Al(d,p) {sup 28}Al, {sup 24}Mg(d,p) {sup 25}Mg, and {sup 24}Mg(d, {alpha}) {sup 22}Na; Sur la separation des mecanismes de reaction a basse energie. Etude des reactions: {sup 27}Al(d,p) {sup 28}Al, {sup 24}Mg(d,p) {sup 25}Mg, et {sup 24}Mg(d, {alpha}) {sup 22}Na

    Energy Technology Data Exchange (ETDEWEB)

    Mermaz, M [Commissariat a l' Energie Atomique, Saclay (France). Centre d' Etudes Nucleaires

    1966-06-01

    The two sets of angular distributions of (d,p) reactions on Al and Mg, measured between 2 and 6 MeV, have given the possibility to test, in analysing the statistical fluctuations of cross-section, the validity of the separation of their mean values in two parts, one 'direct', another given by the statistical mechanism. With the same method of analysis we have studied excitation functions for several alpha groups of the reaction {sup 24}Mg(d, {alpha}) {sup 22}Na and given an evidence for an intermediate structure for the alpha channel leading to the 3. excited state of {sup 22}Na. The angular distribution of the wide resonance at 15.9 MeV in {sup 26}Al has been obtained. (author) [French] Les deux ensembles de distributions angulaires des reactions (d,p) sur Al et Mg, mesures entre 2 et 6 MeV, nous ont permis, en analysant les fluctuations statistiques de sections efficaces, de verifier la possibilite de la separation de leurs valeurs moyennes en deux composantes: l'une 'directe', l'autre due au mecanisme statistique. Avec la meme methode d'analyse nous avons etudie les fonctions d'excitation des premiers groupes alpha de la reaction {sup 24}Mg(d,{alpha}) {sup 22}Na et mis en evidence une structure intermediaire pour la voie de reaction aboutissant au 3eme niveau de {sup 22}Na. Nous avons obtenu la distribution angulaire de la resonance large situee a une energie d'excitation de 15,9 MeV dans {sup 26}Al. (auteur)

  2. Separation of reaction mechanisms at low energy. Study of the reactions: {sup 27}Al(d,p) {sup 28}Al, {sup 24}Mg(d,p) {sup 25}Mg, and {sup 24}Mg(d, {alpha}) {sup 22}Na; Sur la separation des mecanismes de reaction a basse energie. Etude des reactions: {sup 27}Al(d,p) {sup 28}Al, {sup 24}Mg(d,p) {sup 25}Mg, et {sup 24}Mg(d, {alpha}) {sup 22}Na

    Energy Technology Data Exchange (ETDEWEB)

    Mermaz, M. [Commissariat a l' Energie Atomique, Saclay (France). Centre d' Etudes Nucleaires

    1966-06-01

    The two sets of angular distributions of (d,p) reactions on Al and Mg, measured between 2 and 6 MeV, have given the possibility to test, in analysing the statistical fluctuations of cross-section, the validity of the separation of their mean values in two parts, one 'direct', another given by the statistical mechanism. With the same method of analysis we have studied excitation functions for several alpha groups of the reaction {sup 24}Mg(d, {alpha}) {sup 22}Na and given an evidence for an intermediate structure for the alpha channel leading to the 3. excited state of {sup 22}Na. The angular distribution of the wide resonance at 15.9 MeV in {sup 26}Al has been obtained. (author) [French] Les deux ensembles de distributions angulaires des reactions (d,p) sur Al et Mg, mesures entre 2 et 6 MeV, nous ont permis, en analysant les fluctuations statistiques de sections efficaces, de verifier la possibilite de la separation de leurs valeurs moyennes en deux composantes: l'une 'directe', l'autre due au mecanisme statistique. Avec la meme methode d'analyse nous avons etudie les fonctions d'excitation des premiers groupes alpha de la reaction {sup 24}Mg(d,{alpha}) {sup 22}Na et mis en evidence une structure intermediaire pour la voie de reaction aboutissant au 3eme niveau de {sup 22}Na. Nous avons obtenu la distribution angulaire de la resonance large situee a une energie d'excitation de 15,9 MeV dans {sup 26}Al. (auteur)

  3. Sensitivity of the mayfly Adenophlebia auriculata (Ephemeroptera: Leptophlebiidae) to MgSO4 and Na2SO4

    Science.gov (United States)

    Vellemu, E. C.; Mensah, P. K.; Griffin, N. J.; Odume, O. N.

    2017-08-01

    Acid mine drainage (AMD) continues to deteriorate water quality in freshwater ecosystems. Sulphates, a major salt component in AMD, can exacerbate AMD effects in freshwater because salts are toxic to aquatic life in high concentrations. Sulphates are predominant in South African AMD impacted freshwater ecosystems. In this study, the sensitivity of nymphs of the mayfly Adenophlebia auriculata (Ephemeroptera: Leptophlebiidae) was investigated by exposing the organisms to magnesium sulphate (MgSO4) and sodium sulphate (Na2SO4) as models of mining salinisation in short-term (96 h) and long-term (240 h) in static system tests. Short-term and long-term lethal concentrations of each salt were estimated using regression analyses. The results indicated that A. auriculata was more sensitive to MgSO4 (LC50 = 3.81 g/L) than Na2SO4 (LC50 = 8.78 g/L) after short-term exposures. However, this species became sensitive to Na2SO4 (LC10 = 0.19 g/L) but tolerant to MgSO4 (LC10 = 0.35 g/L) after long-term exposures. These results suggest that the 0.25 g/L sulphate compliance limit for South Africa is inadequate to protect A. auriculata from Na2SO4 toxicity in the long-term, yet it overprotects this species from MgSO4 exposures in the short-term. The findings of this study are an important major step in understanding the ecological effects of AMD to aquatic life.

  4. Raman microspectroscopic study of effects of Na(I) and Mg(II) ions on low pH induced DNA structural changes

    NARCIS (Netherlands)

    Muntean, C.M.; Segers-Nolten, Gezina M.J.

    2003-01-01

    In this work a confocal Raman microspectrometer is used to investigate the influence of Na+ and Mg2+ ions on the DNA structural changes induced by low pH. Measurements are carried out on calf thymus DNA at neutral pH (7) and pH 3 in the presence of low and high concentrations of Na+ and Mg2+ ions,

  5. The influence of ball-milling time on the dehydrogenation properties of the NaAlH4-MgH2 composite

    NARCIS (Netherlands)

    Bendyna, J.K.; Dyjak, S.M.; Notten, P.H.L.

    2015-01-01

    The recently developed NaAlH4eMgH2 composite shows improved hydrogen-storage properties compared to MgH2 and NaAlH4. However, the dehydrogenation reaction rates are still too limited, hampering practical applications. Mechanical ball milling is broadly used to improve the dehydrogenation reaction

  6. THE COMPARATIVE ANALYSIS OF THE ACTIVITY ASSAY METHODS FOR MG2+-DEPENDENT NA+/K+-ACTIVATED ATPASE IN ERYTHROCYTE MEMBRANES

    Directory of Open Access Journals (Sweden)

    Polina Anatolevna Petrova

    2017-12-01

    Full Text Available This review considers the methodological reasons for the wide range of results for the red blood cells Mg2+-dependent Na+/K+-ATPase activity described by different authors. We assert that the differences in the Na+/K+-ATPase activity obtained by the researchers are due to the methodological peculiarities associated with methods of obtaining and measurement of the enzyme activity, such as red blood cells separation and storage (centrifugation, concentration and composition of the lysing solution, time and temperature of hemolysis and freezing, as well as the peculiarities of methods for the quantitative determination of protein and inorganic phosphorus. On the basis of the literature data analysis we recommend that for the most accurate determination of the Na+/K+-ATPase activity it is better to use the chelator in the lysing buffer solution and Fiske-Subbarow and Lowry methods for the determination of inorganic phosphorus and quantitative protein content, respectively.

  7. Borophene as an anode material for Ca, Mg, Na or Li ion storage: A first-principle study

    Science.gov (United States)

    Mortazavi, Bohayra; Dianat, Arezoo; Rahaman, Obaidur; Cuniberti, Gianaurelio; Rabczuk, Timon

    2016-10-01

    Borophene, the boron atom analogue to graphene, being atomic thick have been just recently experimentally fabricated. In this work, we employ first-principles density functional theory calculations to investigate the interaction of Ca, Mg, Na or Li atoms with single-layer and free-standing borophene. We first identified the most stable binding sites and their corresponding binding energies as well and then we gradually increased the ions concentration. Our calculations predict strong binding energies of around 4.03 eV, 2.09 eV, 2.92 eV and 3.28 eV between the borophene substrate and Ca, Mg, Na or Li ions, respectively. We found that the binding energy generally decreases by increasing the ions content. Using the Bader charge analysis, we evaluate the charge transfer between the adatoms and the borophene sheet. Our investigation proposes the borophene as a 2D material with a remarkably high capacity of around 800 mA h/g, 1960 mA h/g, 1380 mA h/g and 1720 mA h/g for Ca, Mg, Na or Li ions storage, respectively. This study can be useful for the possible application of borophene for the rechargeable ion batteries.

  8. Synthesis and thermoluminescence characterization of Na6Mg(SO4)4:RE (RE = Ce, Tb) phosphors

    International Nuclear Information System (INIS)

    Kore, Bhushan P.; Dhoble, N.S.; Dhoble, S.J.

    2014-01-01

    Thermoluminescence (TL) properties of sulfate-based phosphors activated by different rare earths have received tremendous attention to the field of radiation dosimetry. Those TL materials based on CaSO 4 have been widely applied for medical and environmental dosimetry. Taking this fact into account we have synthesized Na 6 Mg(SO 4 ) 4 doped with Ce and Tb by wet chemical method. The prepared phosphor was characterized by XRD, FTIR, photoluminescence (PL) and thermoluminescence. For TL study, the phosphor is irradiated with γ-rays from 60 Co source. For studying luminescence properties, the prepared phosphor was annealed at different temperatures and effects of these annealing temperatures on Na 6 Mg(SO 4 ) 4 samples are investigated and quantified. The changes in the glow curve and PL emission spectrum are also investigated as a function of annealing temperature and the annealing temperature was optimized. For calculation of trapping parameters various methods such as peak shape (PS) method, initial rise (IR) method, various heating rate (VHR) method, and computerized glow curve deconvolution (CGCD) are employed. - Highlights: • Na 6 Mg(SO 4 ) 4 phosphor was successfully prepared by wet chemical method. • Effect of annealing temperatures on PL and TL properties has been studied. • Different trap analysis methods were used for calculating the trapping parameters. • Effect of these methods on activation energies were investigated in detail

  9. MAPEAMENTO DE UNIDADES DE RELEVO NA MÉDIA SERRA DO ESPINHAÇO MERIDIONAL - MG

    Directory of Open Access Journals (Sweden)

    Éric Andrade Rezende

    2011-04-01

    Full Text Available O presente trabalho propõe um mapeamento de unidades de relevo para a porção sul do terço médio da Serra do Espinhaço Meridional. As unidades de relevo foram delimitadas a partir da análise integrada de cartas temáticas e imagens de satélite que permitiram observar variações na morfologia, na altimetria, na declividade, na litoestrutura e na organização da rede de drenagem. A etapa de cartografia digital, processada no software ArcGis 9.2, se baseou na utilização de produtos SRTM (Shuttle Radar Topography Mission. Os procedimentos metodológicos também incluíram trabalhos de campo e pesquisa bibliográfica. Foi empregada a taxonomia do mapeamento geomorfológico proposta pelo IBGE (2009, através da qual foram individualizadas quatorze Unidades Geomorfológicas. As unidades estão distribuídas entre cinco diferentes compartimentos do seguinte modo: dois planaltos, duas escarpas, seis depressões, três conjuntos de cristas e um conjunto de patamares. Foi possível observar que a disposição geral das unidades reflete o forte controle litoestrutural imposto ao relevo regional. Destaca-se a resistência diferenciada das diversas litologias frente aos processos denudacionais e a influência da neotectônica na geomorfogênese.

  10. The phase diagrams of KCaF3 and NaMgF3 by ab initio simulations

    Science.gov (United States)

    Jakymiw, Clément; Vočadlo, Lidunka; Dobson, David P.; Bailey, Edward; Thomson, Andrew R.; Brodholt, John P.; Wood, Ian G.; Lindsay-Scott, Alex

    2018-04-01

    ABF3 compounds have been found to make valuable low-pressure analogues for high-pressure silicate phases that are present in the Earth's deep interior and that may also occur in the interiors of exoplanets. The phase diagrams of two of these materials, KCaF3 and NaMgF3, have been investigated in detail by static ab initio computer simulations based on density functional theory. Six ABF3 polymorphs were considered, as follows: the orthorhombic perovskite structure (GdFeO3-type; space group Pbnm); the orthorhombic CaIrO3 structure ( Cmcm; commonly referred to as the "post-perovskite" structure); the orthorhombic Sb2S3 and La2S3 structures (both Pmcn); the hexagonal structure previously suggested in computer simulations of NaMgF3 ( P63/ mmc); the monoclinic structure found to be intermediate between the perovskite and CaIrO3 structures in CaRhO3 ( P21/ m). Volumetric and axial equations of state of all phases considered are presented. For KCaF3, as expected, the perovskite phase is shown to be the most thermodynamically stable at atmospheric pressure. With increasing pressure, the relative stability of the KCaF3 phases then follows the sequence: perovskite → La2S3 structure → Sb2S3 structure → P63/ mmc structure; the CaIrO3 structure is never the most stable form. Above about 2.6 GPa, however, none of the KCaF3 polymorphs are stable with respect to dissociation into KF and CaF2. The possibility that high-pressure KCaF3 polymorphs might exist metastably at 300 K, or might be stabilised by chemical substitution so as to occur within the standard operating range of a multi-anvil press, is briefly discussed. For NaMgF3, the transitions to the high-pressure phases occur at pressures outside the normal range of a multi-anvil press. Two different sequences of transitions had previously been suggested from computer simulations. With increasing pressure, we find that the relative stability of the NaMgF3 phases follows the sequence: perovskite → CaIrO3 structure → Sb2

  11. O tempo vivido na perspectiva fenomenológica de Eugène Minkowski El tiempo vivido en la perspectiva fenomenológica de Eugène Minkowski The lived-time in the phenomenological perspective of Eugène Minkowski

    Directory of Open Access Journals (Sweden)

    Virginia E. Suassuna Martins Costa

    2009-06-01

    Full Text Available Este artigo tem como objetivo abordar as concepções de tempo assimilado ao espaço e de tempo vivido, especificando seus elementos estruturais e os fenômenos a eles relacionados, com base na perspectiva de Eugène Minkowski. Para tal, evidencia algumas conceituações a respeito do tempo em Santo Agostinho e em Henry Bergson", assim com em alguns aspectos biográficos de Minkowski, que contribuíram para a compreensão a respeito do fenômeno tempo. Como meta, pretende oferecer subsídios para a reflexão dos profissionais de saúde no encontro clínico.Este artículo tiene el objetivo de tratar sobre los conceptos del tiempo asimilados al espacio y del tiempo vivido, especificando sus elementos estructurales y fenómenos relacionados, embasados en la perspectiva de Eugène Minkowski. Para esto, se evidencia algunos conceptos relacionados con el tiempo en Santo Agostinho y en Henry Bergson, así como los aspectos biográficos de Minkowski que han contribuido para entenderse sobre el fenómeno del tiempo. Como meta, este artículo se propone a ofrecer subsidios a la reflexión por los profesionales de salud en el encuentro clínico.This article has the objective to deal about the conceptions of time assimilated with the space and the lived time, specifying its structural elements and related phenomena, based on Eugène Minkowski's perspective. For this, it is evidenced some concepts related to time in Saint Augustin and in Henry Bergson, as well as some Minkowski's biographic aspects that have contributed for understanding about time's phenomenon. As a goal, this paper intends to offer subsidies for the reflection by health professionals on clinic meeting.

  12. Collisional redistribution of the Na-D lines in a Ne, Xe filled vapour cell and depolarization in a flame

    International Nuclear Information System (INIS)

    Nieuwesteeg, K.J.B.M.

    1986-01-01

    1. Measurements of collisionally perturbed, 'complete' spectral profiles, i.e. core plus line wings of the Na-D lines, at the highest possible temperature in a fluorescence cell are reported. Both the shape of the profiles obtained in these experiments and the temperature dependence give information about the internuclear forces. Neon and xenon are chosen as perturbing atoms in order to extend and test potential shapes that have emerged from earlier beam experiments. 2. Possible ways are discussed of accurately calculating the cross sections of all elastic and inelastic processes in a Na- noble-gas system for any likely shape of the potentials involved. The main purpose of this discussion is to test these potentials by comparing the calculated cross sections with experimental data. Also a detailed comparison is made of the measured far-wing profile and the quasi-static profile calculated using these potentials. 3. In order to assess the validity of the approximations made in the theoretical model that was used for calculating the fluorescence-excitation profiles, the predictions of this model are compared with measurements of the polarization and the intensity ratio of the collision-induced Na-D fluorescence and Rayleigh scattering in an N 2 -diluted flame at 1 atm pressure. Using the Utrecht High-resolution Fourier Interferometer in the visible range, the Rayleigh peak and the collision-induced fluorescence were separated for the first time at laser detunings within the absorption line width. (Auth.)

  13. The Ca, Cl, Mg, Na, and P mass fractions in benign and malignant giant cell tumors of bone investigated by neutron activation analysis

    International Nuclear Information System (INIS)

    Vladimir Zaichick; German Davydov; Tatyana Epatova; Sofia Zaichick

    2015-01-01

    The Ca, Cl, Mg, Na, and P content and Ca/P, Ca/Mg, Ca/Na, Cl/Ca, and Cl/Na ratios in samples of intact bone, benign and malignant giant cell tumor (GCT) of bone were investigated by neutron activation analysis with high resolution spectrometry of short-lived radionuclides. It was found that in GCT tissue the mass fractions of Cl and Na are higher and the mass fraction of Ca and P are lower than in normal bone tissues. Moreover, it was shown that higher Cl/Na mass fraction ratios as well as lower Ca/Cl, Ca/Mg, and Ca/Na mass fraction ratios are typical of the GCT tissue compared to intact bone. Finally, we propose to use the estimation of such parameters as the Cl mass fraction and the Ca/Cl mass fraction ratio as an additional test for differential diagnosis between benign and malignant GCT. (author)

  14. La constitución de naüne (cuerpo) entre los yunatügü (tikuna)

    OpenAIRE

    Abel Antonio Santos Angarita

    2014-01-01

    Los yunatügü (tikuna) perciben a los na (seres) como poseedores de cuatro principios fundamentales: pora (poder), naẽ (pensamiento), maü̃ (vitalidad) y kua̰ (conocimiento). Para el yuukü (curandero) el cuerpo humano es una red de tü (hilos) de humo de tabaco. Los cuerpos están interconectados con Naane (territorio, cosmos) por intermedio de esos tü, plantados en el cuerpo; mediante ellos las energías positivas y negativas entran y salen del cuerpo, y a través de ellos podemos ser víctimas de...

  15. REVIZORJEVA OCENA TVEGANJA POMEMBNO NAPAČNE NAVEDBE ZARADI PREVARE V RAČUNOVODSKIH IZKAZIH NA PODLAGI TRIANGULACIJE REVIZIJSKIH DOKAZOV

    OpenAIRE

    Ličen, Tomaž

    2013-01-01

    Pojem prevare je težko opredeljiv, saj je odvisen od tega, iz katerega zornega kota prevaro opazujemo. Po standardih jih delimo na poslovodske in zaposlenske. Motive za nastanek prevare smo predstavili s trikotnikom prevar, ki razlaga, da posamezniki zagrešijo prevaro, ko so prisotni trije dejavniki: pritisk, priložnost in racionalizacija. Glavno odgovornost za preprečevanje in odkrivanje prevar nosi poslovodstvo, ki mora skrbeti za usmeritve in postopke, ki pomagajo dosegati kolikor mogoče p...

  16. Experimental Thermodynamics of [Na-Mg-Cl-SO4] Aqueous Solutions at GPa Pressure With Application to Icy Worlds.

    Science.gov (United States)

    Brown, J. M.; Bollengier, O.; Vance, S.

    2017-12-01

    Water competes with silicates as the main constituent of solid bodies in the outer solar system. Ganymede and Titan, the Mercury-sized satellites of Jupiter and Saturn, are made up half of water present as massive hydrospheres where pressure can reach up to 1.5 GPa. Geophysical data and planetary models unequivocally support the existence of global aqueous oceans trapped in these hydrospheres. However, the extent of these oceans and their role in the processes governing the internal structure of these moons remain unresolved. At issue is the poor to non-existent characterization, at the relevant pressures, of the properties of the aqueous fluids of significance to the outer solar system (with notably the Na-Mg-Cl-SO4 salts found in primitive chondrites), forcing current models to rely on pure water only. Our team at the University of Washington has developed an experimental apparatus to acquire the speed of sound of aqueous solutions in the 0 - 0.7 GPa and 250 - 350 K pressure and temperature ranges covering most of the conditions of existence of these extra-terrestrial oceans. Speeds of sound measured over a grid of pressures and temperatures allow calculation of the thermodynamic quantities (G, ρ, μ...) required for planetary science. Early analysis of pure water samples indicates our experimental results are on par with (at lower pressures), or better than, the IAPWS water laboratory standard, with sound speeds determined to 0.02% over our entire pressure range. For the first time at the high pressures of interest for large icy moons, we achieved the exploration of H2O-NaCl, H2O-MgSO4, H2O-Na2SO4 and H2O-MgCl2 solutions, from dilute concentrations to saturation. We are now in the process of acquiring the first data for H2O-NaCl-MgSO4 mixtures. We will briefly present our experimental setup and the underlying sound speed theory, and will then compare our results for the four endmembers, with an emphasis on their different association behavior under pressure as

  17. The local structure of Ca-Na pyroxenes. 2-Xanes studies at the Mg and A1 K edges

    International Nuclear Information System (INIS)

    Mottana, A.; Cibin, G.; Paris, E.; Giuli, G.; Florence Univ., Florence

    1999-01-01

    X-ray absorption spectra at the Mg and A1 K edges have been recorded on synthetic endmember diopside (Di) and jadeite (Jd) and on a series of natural Fe-poor Ca-Na clinopyroxenes compositionally straddling the Jd-Di join. The spectra of C2/c members of the series (C-omphacites) are different from having P2/n symmetry (P-omphacites). Differences can be explained by theoretical spectra calculated via the multiple-scattering formalism on atomic clusters with at least 89 atoms, extending to a. 0.62 nm away from the Mg viz. A1 absorber: Xanes detects in these systems medium- rather than short-range order-disorder relationships. Near-edge features of C-omphacites reflect the single-type of octahedral arrangement of the back scattering nearest-neighbours (six O atoms) around the absorber (Mg resp. A1) at the centre of the cluster (site M1). Others arise again from medium-range order. P-omphacites show more complicated spectra than C-omphacites. Their additional features reflect the increased local disorder around the probed atom (Mg resp. A1) induced by the two alternative M1, M11 configurations of the six O atoms forming the first co-ordination spheres. Mg and A1 are confirmed to be preferentially partitioned in the M1 resp. M11 site of the P-omphacite crystal structure, however never exclusively, but in a ratio close to 85:15 (plus or minus 10%) that implies a certain degree of local disorder. Changes in the relative heights of some prominent features are more evident in the A1 than in the Mg K-edge spectra. They are diagnostic to qualitatively distinguish C-from P-omphacites

  18. The local structure of Ca-Na pyroxenes. 2-Xanes studies at the Mg and A1 K edges

    Energy Technology Data Exchange (ETDEWEB)

    Mottana, A. [Rome Univ. Roma Tre, Rome (Italy). Dipt. di Scienze Geologiche; Murata, T. [Kyoto University of Education, Kyoto (Japan). Dept. of Physics; Marcelli, A. [Istituto Nazionale di Fisica Nucleare, Frascati, RM (Italy). Laboratori Nazionali di Frascati; Wu, Z.Y. [Istituto Nazionale di Fisica Nucleare, Frascati, RM (Italy). Laboratori Nazionali di Frascati]|[Laboratoire Piere Suee, Gif-sur Yvette Cedex, (France); Cibin, G. [Istituto Nazionale di Fisica Nucleare, Frascati, RM (Italy). Laboratori Nazionali di Frascati; Paris, E. [Camerino Univ., Camerino, MC (Italy). Dipt. di Scienze della Terra; Giuli, G. [Camerino Univ., Camerino, MC (Italy). Dipt. di Scienze della Terra]|[Florence Univ., Florence (Italy). Dipt. di Scienze della Terra

    1999-07-01

    X-ray absorption spectra at the Mg and A1 K edges have been recorded on synthetic end member diopside (Di) and jadeite (Jd) and on a series of natural Fe-poor Ca-Na clinopyroxenes compositionally straddling the Jd-Di join. The spectra of C2/c members of the series (C-omphacites) are different from having P2/n symmetry (P-omphacites). Differences can be explained by theoretical spectra calculated via the multiple-scattering formalism on atomic clusters with at least 89 atoms, extending to a. 0.62 nm away from the Mg viz. A1 absorber: Xanes detects in these systems medium- rather than short-range order-disorder relationships. Near-edge features of C-omphacites reflect the single-type of octahedral arrangement of the back scattering nearest-neighbours (six O atoms) around the absorber (Mg resp. A1) at the centre of the cluster (site M1). Others arise again from medium-range order. P-omphacites show more complicated spectra than C-omphacites. Their additional features reflect the increased local disorder around the probed atom (Mg resp. A1) induced by the two alternative M1, M11 configurations of the six O atoms forming the first co-ordination spheres. Mg and A1 are confirmed to be preferentially partitioned in the M1 resp. M11 site of the P-omphacite crystal structure, however never exclusively, but in a ratio close to 85:15 (plus or minus 10%) that implies a certain degree of local disorder. Changes in the relative heights of some prominent features are more evident in the A1 than in the Mg K-edge spectra. They are diagnostic to qualitatively distinguish C-from P-omphacites.

  19. Classification of x-ray spectra of 2-3 transitions in the Ne-like and Na-like isoelectronic sequences of the elements from krypton to molybdenum

    International Nuclear Information System (INIS)

    Gordon, H.; Hobby, M.G.; Peacock, N.J.; Cowan, R.D.

    1979-01-01

    Plasmas produced by the laser irradiation of solid targets and in a plasma focus device have been employed as sources of x-ray spectra of the elements Kr(Z = 36)-Mo(Z = 42). The Ne-like isoelectronic sequence has been investigated by comparing observed wavelengths with ab initio atomic structure calculations and isoelectronic interpolation. Previous identifications in Ne-like ions have been extended to krypton, rubidium and strontium. The Na-like satellite structure of these elements has also been studied and a detailed classification of these satellites is presented. (author)

  20. O Que se Compra na Feira? Perfil e Fatores de Decisao do Consumidor em Lavras, MG.

    OpenAIRE

    Silvestre, Luiz Henrique; Neto, Exzolvildres Queiroz; Calixto, Juliana Sena; Ramos, Rosana Vieira; Antonialli, Luiz Marcelo

    2006-01-01

    O mercado local não é apenas um espaço de venda de produtos, mas também de garantia da segurança alimentar, de fortalecimento da pequena agricultura e de dinamização econômica por reter por mais tempo o recurso no município, fazendo-o circular entre a população local, possibilitando a satisfação das necessidades. Mas o que os consumidores compram na feira? A opção de ir a feira está ligada apenas a aquisição de alimentos ou há outras características que os consumidores também compram? Quais s...

  1. Vacuum ultraviolet synchrotron measurements of excitons in NaMgF{sub 3}:Yb{sup 2+}

    Energy Technology Data Exchange (ETDEWEB)

    Hughes-Currie, Rosa B. [Department of Physics and Astronomy, University of Canterbury, PB 4800, Christchurch 8140 (New Zealand); Ivanovskikh, Konstantin V. [ANK Service Ltd., PB 58, Novouralsk 624131, Sverdlovsk Region (Russian Federation); Ural Federal University, 19 Mira st., Ekaterinburg 620002 (Russian Federation); Reid, Michael F., E-mail: mike.reid@canterbury.ac.nz [Department of Physics and Astronomy, University of Canterbury, PB 4800, Christchurch 8140 (New Zealand); MacDiarmid Institute for Advanced Materials and Nanotechnology (New Zealand); Wells, Jon-Paul R. [Department of Physics and Astronomy, University of Canterbury, PB 4800, Christchurch 8140 (New Zealand); Dodd-Walls Centre for Quantum and Photonic Technologies (New Zealand); Reeves, Roger J. [Department of Physics and Astronomy, University of Canterbury, PB 4800, Christchurch 8140 (New Zealand); MacDiarmid Institute for Advanced Materials and Nanotechnology (New Zealand); Meijerink, Andries [Debye Institute, Utrecht University, P.O. Box 80 000, 3508 TA Utrecht (Netherlands)

    2016-01-15

    Results of a vacuum ultraviolet spectroscopic characterization of NaMgF{sub 3}:Yb{sup 2+} are presented. The material demonstrates emission features associated with self-trapped excitons and impurity-trapped excitons. The emission features noticeably overlap giving rise to a broad emission band from 17 000 to 35 000 cm{sup −1} at a sample temperature of 8 K. To identify the true profiles of the emission features we have used a deconvolution procedure. The deconvolution was possible due to the thermal quenching of self-trapped excitons at room temperature that allowed for direct observations of the impurity trapped exciton emission band. Energy transfer between host electronic excitations (excitons and e–h pairs) and Yb{sup 2+} ions leading to the formation of impurity-trapped excitons is evident from excitation spectra. - Highlights: • We present VUV emission and excitation spectra of NaMgF{sub 3}:Yb{sup 2+}. • Formation of free excitons leads to emission from intrinsic and extrinsic excitons. • We deconvolute the emission to separate the two overlapping exciton bands. • The excitation spectra show two mechanisms for forming impurity-trapped excitons.

  2. (e, 2e) triple differential cross sections of alkali and alkali earth atoms: Na, K and Mg, Ca

    International Nuclear Information System (INIS)

    Hitawala, U; Purohit, G; Sud, K K

    2008-01-01

    Recently low-energy measurements have been reported for alkali targets Na and K and alkali earth targets Mg and Ca in coplanar symmetric geometry. We report the results of our calculation of triple differential cross section (TDCS) for electron impact single ionization (i.e. (e, 2e) processes) of alkali atoms Na, K and alkali earth atoms Mg, Ca in coplanar symmetric geometry. We have performed the present calculations using the distorted-wave Born approximation (DWBA) formalism at intermediate incident electron energies used in the recently performed experiments. Ionization takes place from the valence shell for all the targets investigated and the outgoing electrons share the excess energy equally. We have also considered the effect of target polarization in our DWBA calculations which may be an important quantity at incident electron energies used in the present investigation. We find that the DWBA formalism is able to reproduce most of the trend of experimental data and may provide a future direction for further investigation of ionization process on alkali and alkali earth metals. It is also observed that the second-order effects are more important to understand the collision dynamics of (e, 2e) processes on alkali earth targets

  3. Effects of hyper- and hypothyroidism on acetylcholinesterase, (Na(+), K (+))- and Mg ( 2+ )-ATPase activities of adult rat hypothalamus and cerebellum.

    Science.gov (United States)

    Carageorgiou, Haris; Pantos, Constantinos; Zarros, Apostolos; Stolakis, Vasileios; Mourouzis, Iordanis; Cokkinos, Dennis; Tsakiris, Stylianos

    2007-03-01

    Thyroid hormones (THs) are recognized as key metabolic hormones, and the metabolic rate increases in hyperthyroidism, while it decreases in hypothyroidism. The aim of this work was to investigate how changes in metabolism induced by THs could affect the activities of acetylcholinesterase (AChE), (Na(+), K(+))- and Mg(2+)-ATPase in the hypothalamus and the cerebellum of adult rats. Hyperthyroidism was induced by subcutaneous administration of thyroxine (25 microg/100 g body weight) once daily for 14 days, while hypothyroidism was induced by oral administration of propylthiouracil (0.05%) for 21 days. All enzyme activities were evaluated spectrophotometrically in the homogenated brain regions of 10 three-animal pools. Neither hyper-, nor hypothyroidism had any effect on the examined hypothalamic enzyme activities. In the cerebellum, hyperthyroidism provoked a significant decrease in both the AChE (-23%, p activities (-26%, p activities: AChE (-17%, p activity was found unaltered in both the hyper- and the hypothyroid brain regions. neither hyper-, nor hypothyroidism had any effect on the examined hypothalamic enzyme activities. In the cerebellum, hyperthyroidism provoked a significant decrease in both the AChE and the Na(+), K(+)-ATPase activities. The decreased (by the THs) Na(+), K(+)-ATPase activities may increase the synaptic acetylcholine release, and thus, could result in a decrease in the cerebellar AChE activity. Moreover, the above TH-induced changes may affect the monoamine neurotransmitter systems.

  4. La constitución de naüne (cuerpo entre los yunatügü (tikuna

    Directory of Open Access Journals (Sweden)

    Abel Antonio Santos Angarita

    2014-09-01

    Full Text Available Los yunatügü (tikuna perciben a los na (seres como poseedores de cuatro principios fundamentales: pora (poder, naẽ (pensamiento, maü̃ (vitalidad y kua̰ (conocimiento. Para el yuukü (curandero el cuerpo humano es una red de tü (hilos de humo de tabaco. Los cuerpos están interconectados con Naane (territorio, cosmos por intermedio de esos tü, plantados en el cuerpo; mediante ellos las energías positivas y negativas entran y salen del cuerpo, y a través de ellos podemos ser víctimas de los yuukü maléficos y de los ngo̰ogü (espíritus. El cuerpo es un flujo de energía que está en constante reajuste, ligado íntimamente a la organización sociocultural del grupo. Los tikuna deben realizar constantemente acciones y respetar prohibiciones para lograr esos ajustes, lo cuales constituyen relaciones personales y colectivas con los animales, plantas, fenómenos naturales y seres visibles e invisibles. Es ahí que el acto del yuukü funciona como un elemento de mediación para el equilibrio corpóreo individual y social. 

  5. Rotational energy transfer in Na2 (A Σ) colliding with Xe, Kr, Ar, Ne, He, H2, CH4, and N2: Experiment and fitting laws

    International Nuclear Information System (INIS)

    Brunner, T.A.; Smith, N.; Karp, A.W.; Pritchard, D.E.

    1981-01-01

    Using the method of laser-induced fluorescence, we have measured level to level rate constants for rotational energy transfer (RET) in Na 2 colliding with Xe, Kr, Ar, Ne, He, H 2 , N 2 , and CH 4 . For each target gas we varied the initial rotational quantum number ji-italic over a wide range, typically 4--100, and measured approximately 60 rate constants with an average error of between 6% and 9%. The resulting base of 479 rate constants is used to test several recently proposed fitting laws. The energy corrected sudden scaling law of DePristo et al., when combined with the assumption of a power gap law for the basis rate constants k/sub l/→0, fit with only 3 parameters all of the data for a given target gas with 7%--12% average percentage deviation. Our statistical power gap law worked well and was generally the best law for those data sets with only one value of j/sub i/. The worst fits in all cases considered here were those using the exponential gap law of surprisal theory

  6. Analysis of time- and space-resolved Na-, Ne-, and F-like emission from a laser-produced bromine plasma

    International Nuclear Information System (INIS)

    Goldstein, W.H.; Young, B.K.F.; Osterheld, A.L.; Stewart, R.E.; Walling, R.S.; Bar-Shalom, A.

    1991-01-01

    Advances in the efficiency and accuracy of computational atomic physics and collisional radiative modeling promise to place the analysis and diagnostic application of L-shell emission on a par with the simpler K-shell regime. Coincident improvements in spectroscopic plasma measurements yield optically thin emission spectra from small, homogeneous regions of plasma, localized both in space and time. Together, these developments can severely test models for high-density, high-temperature plasma formation and evolution, and non-LTE atomic kinetics. In this paper we present highly resolved measurements of n=3 to n=2 X-ray line emission from a laser-produced bromine micro plasma. The emission is both space- and time-resolved, allowing us to apply simple, steady-state, 0-dimensional spectroscopic models to the analysis. These relativistic, multi-configurational, distorted wave collisional-radiative models were created using the HULLAC atomic physics package. Using these models, we have analyzed the F-like, Ne-like and Na-like (satellite) spectra with respect to temperature, density and charge-state distribution. This procedure leads to a full characterization of the plasma conditions. 9 refs., 3 figs

  7. Enhancing anaerobic digestion of waste activated sludge by the combined use of NaOH and Mg(OH)2: Performance evaluation and mechanism study.

    Science.gov (United States)

    Huang, Cheng; Lai, Jia; Sun, Xiuyun; Li, Jiansheng; Shen, Jinyou; Han, Weiqing; Wang, Lianjun

    2016-11-01

    In this study, the combination treatment of NaOH and Mg(OH)2 was applied to anaerobic digestion of waste activated sludge (WAS) for simultaneously enhancement of volatile fatty acids (VFAs) production, nutrients removal and sludge dewaterability. The maximum VFAs production (461mg COD/g VSS) was obtained at the NaOH/Mg(OH)2 ratio of 75:25, which was much higher than that of the blank or sole NaOH. Moreover, nutrients removal and sludge dewaterability were improved by the combined using of NaOH and Mg(OH)2. Mechanism investigations revealed that the presence of Mg(OH)2 could maintain alkaline environment, which contributed to inhibit the activity of methanogens. Also, the bridging between Mg(2+) and extracellular polymeric substances (EPS) plays an important role in the solubilization and dewatering of sludge. High-throughput sequencing analysis demonstrated that the abundance of bacteria involved in sludge hydrolysis and VFAs accumulation was greatly enriched with the mixtures of NaOH and Mg(OH)2. Copyright © 2016 Elsevier Ltd. All rights reserved.

  8. A comparative corrosion behavior of Mg, AZ31 and AZ91 alloys in 3.5% NaCl solution

    Directory of Open Access Journals (Sweden)

    I.B. Singh

    2015-06-01

    Full Text Available The corrosion behavior of Mg, AZ31 and AZ91 has been evaluated in 3.5% NaCl solution using weight loss, electrochemical polarization and impedance measurements. Corrosion rate derived from the weight losses demonstrated the occurrence of steeply fast corrosion reaction on AZ91 alloy after three hours of immersion, indicating the start of galvanic corrosion. An increase of corrosion rate with immersion time was also observed for AZ31 but with lesser extent than AZ91 alloy. Whereas Mg metals showed a decrease of corrosion rate with immersion time, suggesting the formation of a protective layer on their surfaces. In contrast, the corrosion current density (Icorr derived from the Tafel plots, exhibited their corrosion resistances in order of Mg > AZ91 > AZ31. Electrochemical charge transfer resistance (Rct and double layer capacitance measured by electrochemical impedance spectroscopy (EIS, are well in accordance with the measured Icorr. EIS measurements with time and microstructural examination of the corroded and uncorroded samples are helpful in elucidation of results measured by electrochemical polarization.

  9. GRANDES EMPREENDIMENTOS HABITACIONAIS NA CIDADE DE UBERLÂNDIA – MG

    Directory of Open Access Journals (Sweden)

    Ivone Tavares Batista

    2017-10-01

    Article present search demonstrate and match some forms of occupation of urban land space, where real estate projects with government partnerships bring to the municipalities the housing, which will mainly contemplate the low-income population, may provide these quality a dignified life. This work aims to analyze the housing developments of social interest implanted over decades in the city of Uberlândia using as main methodology searches files of the City Hall of Uberlândia resulting in the number of families served by the popular housing programs, realizing how much is necessary expansion of public policies in relation to home ownership. It was highlighted as analyzed in the great enterprise implant in Sector South of the city, called Shopping Park III, IV, V, VI and VII, which contributed to the reduction of homelessness in the city of Uberlândia - MG. Keywords: Urban Space; Housing Estates; Illegal Occupation; Government. RESUMEN El presente artículo busca demostrar y equipar algunas formas de ocupación del espacio territorial urbano, donde los emprendimientos inmobiliarios en alianzas con el Gobierno, traen a los municipios los conjuntos habitacionales, que van a comportarse principalmente a la población de bajos ingresos. Este trabajo objetiva analizar los emprendimientos habitacionales de interés social implantados a lo largo de décadas en la ciudad de Uberlândia utilizando como metodología principal investigaciones archivos del Ayuntamiento Municipal de Uberlândia dando como resultado el número de familias atendidas por los programas de vivienda popular, percibiendo cuán necesaria es la expansión de las políticas públicas en relación a la casa propia. Se destacó como objeto de análisis el gran emprendimiento implantado en el Sector Sur de la ciudad, denominado de Shopping Park III, IV, V, VI y VII, que colaboró para la disminución de la falta de vivienda en el Municipio de Uberlândia - MG. Palabras clave: Espacio Urbano; Conjuntos

  10. Exigências nutricionais em macronutrientes minerais (Ca, P, Mg, Na e K para novilhos de diferentes grupos genéticos Macrominerals (Ca, P, Mg, Na, and K requirements for young bulls from different genetic groups

    Directory of Open Access Journals (Sweden)

    Fernando de Paula Leonel

    2006-04-01

    Full Text Available Determinaram-se as exigências em macronutrientes minerais (Ca, P, Mg, Na e K utilizando-se 44 novilhos não-castrados, pertencentes a quatro grupos genéticos (Nelore; F1 Nelore x Aberdeen-Angus; F1 Nelore x Pardo-Suíço e F1 Nelore x Simental, com média de 10 e 11 meses de idade e peso vivo inicial de 362 ± 35 kg. A ração experimental foi composta de feno de capim-braquiária (Brachiaria decumbens, Stapf., farelo de soja, milho (grão moído, melaço em pó e suplementos de macro e micronutrientes inorgânicos. As exigências líquidas para ganho de peso, em cada macronutriente, foram obtidas por meio da derivada primeira de suas respectivas equações, estimadas a partir de regressão não-linear do conteúdo do nutriente (Ca, P, Mg, Na e K, em função do peso de corpo vazio do animal. Para conversão do peso vivo em peso de corpo vazio, utilizou-se a equação obtida a partir da regressão do peso corporal vazio dos animais experimentais em função de seus pesos imediatamente antes do abate. As exigências de mantença foram estimadas de acordo com as recomendações do NRC e ARC e os coeficientes de absorção adotados para os cinco macronutrientes foram aqueles propostos pelo ARC. O teste de identidade de modelos indicou não haver diferenças entre as equações de regressão para os minerais entre os quatro grupos genéticos estudados. Não foram verificadas, pela análise de variância, diferenças entre as exigências de macrominerais entre os diferentes grupos genéticos.The objective of this trial was to determine the macrominerals requirements (Ca, P, Mg, Na, and K for young bulls from different genetic groups. Forty-four young bulls from the following genetic groups were used: Nellore, F1 Nellore x Aberdeen-Angus, F1 Nellore x Brown Swiss, and F1 Nellore x Simmental. Animals averaged 362 ± 35 kg of initial body weight and between 10 to 11 months of age. Diet contained signal grass hay (Brachiaria decumbens, Stapf., soybean

  11. Effects of aqueous extract of Hibiscus sabdariffa on renal Na(+)-K(+)-ATPase and Ca(2+)-Mg(2+)-ATPase activities in Wistar rats.

    Science.gov (United States)

    Olatunji, Lawrence A; Usman, Taofeek O; Adebayo, Joseph O; Olatunji, Victoria A

    2012-09-01

    To investigate the effects of oral administration of aqueous extract of Hibiscus sabdariffa on renal Na(+)-K(+)-ATPase and Ca(2+)-Mg(2+)-ATPase activities in rats. The 25 and 50 mg/(kg·d) of aqueous extracts of H. sabdariffa were respectively given to rats in the experimental groups for 28 d, and rats in the control group received an appropriate volume of distilled water as vehicle. Na(+)-K(+)-ATPase and Ca(2+)-Mg(2+)-ATPase activities in the kidney were assayed by spectrophotometric method. Administrations of 25 and 50 mg/(kg·d) of aqueous extract of H. sabdariffa significantly decreased the Ca(2+)-Mg(2+)-ATPase activity in the kidney of rats (Psabdariffa may preserve the renal function despite a decreased renal Ca(2+)-Mg(2+)-ATPase activity.

  12. Determination of Cl, K, Mg, Mn, Na and V in Brazilian red wine by neutron activation analysis

    Energy Technology Data Exchange (ETDEWEB)

    Daniele, Anna Paula; Maihara, Vera Akiko, E-mail: annapaula@usp.br [Instituto de Pesquisas Energeticas e Nucleares (IPEN/CNEN-SP), Sao Paulo, SP (Brazil)

    2015-07-01

    Several studies have been carried out for determining essential elements in foodstuffs due to important nutritional role in human body functions. Such information is crucial to any intervention in the diet of a population, thus becoming representative in the public health field. Trace elements are good indicators of wine’s origin and their concentrations can be used as criteria to ensure authenticity, quality and show that the tolerance limits established by law were respected throughout the production process. Although Brazilian wine industry is among the 15 largest in the world, analytical studies on the content of organic and inorganic compounds in wine are still small compared to other major producers. This study aimed to evaluate the elemental concentration of Cl, K, Mg, Mn, Na and V in seven national red wine samples acquired in the markets of Sao Paulo city. The analytical method applied was INAA. Concentrations of the elements in wine samples showed high variation among samples. (author)

  13. Band gap opening in silicene on MgBr2(0001) induced by Li and Na

    KAUST Repository

    Zhu, Jiajie

    2014-11-12

    Silicene consists of a monolayer of Si atoms in a buckled honeycomb structure and is expected to be well compatible with the current Si-based technology. However, the band gap is strongly influenced by the substrate. In this context, the structural and electronic properties of silicene on MgBr2(0001) modified by Li and Na are investigated by first-principles calculations. Charge transfer from silicene (substrate) to substrate (silicene) is found for substitutional doping (intercalation). As compared to a band gap of 0.01 eV on the pristine substrate, strongly enhanced band gaps of 0.65 eV (substitutional doping) and 0.24 eV (intercalation) are achieved. The band gap increases with the dopant concentration.

  14. Aspectos epidemiológicos dateníase-cisticercose na área endêmica de Lagamar, MG

    OpenAIRE

    Silva-Vergara, Mario León; Prata, Aluízio; Vieira, Cláudio de Oliveira; Castro, João Henrique; Micheletti, Luciane Giroto; Otaño, Arturo Santana; Franquini Júnior, João

    1995-01-01

    Um inquérito epidemiológico sobre teníase-cisticercose foi realizado em Lagamar- MG em 1992. Cadastradas 1109 casas com 3344 habitantes. O inquérito abrangeu 875 (86%) famílias e foi respondido por um informante que, em 80% dos casos, foi o pai. Na cidade havia 100 chiqueiros em 100 (11,4%) casas que albergavam 406 suínos, em condições extremamente precárias. Em 300 (34,2%) casas havia o antecedente de teníase em algum membro da família. O antecedente de convulsão foi relatado por 125 (14,2%)...

  15. Determination of Cl, K, Mg, Mn, Na and V in Brazilian red wine by neutron activation analysis

    International Nuclear Information System (INIS)

    Daniele, Anna Paula; Maihara, Vera Akiko

    2015-01-01

    Several studies have been carried out for determining essential elements in foodstuffs due to important nutritional role in human body functions. Such information is crucial to any intervention in the diet of a population, thus becoming representative in the public health field. Trace elements are good indicators of wine’s origin and their concentrations can be used as criteria to ensure authenticity, quality and show that the tolerance limits established by law were respected throughout the production process. Although Brazilian wine industry is among the 15 largest in the world, analytical studies on the content of organic and inorganic compounds in wine are still small compared to other major producers. This study aimed to evaluate the elemental concentration of Cl, K, Mg, Mn, Na and V in seven national red wine samples acquired in the markets of Sao Paulo city. The analytical method applied was INAA. Concentrations of the elements in wine samples showed high variation among samples. (author)

  16. Aspectos epidemiológicos dateníase-cisticercose na área endêmica de Lagamar, MG

    Directory of Open Access Journals (Sweden)

    Mario León Silva-Vergara

    1995-12-01

    Full Text Available Um inquérito epidemiológico sobre teníase-cisticercose foi realizado em Lagamar- MG em 1992. Cadastradas 1109 casas com 3344 habitantes. O inquérito abrangeu 875 (86% famílias e foi respondido por um informante que, em 80% dos casos, foi o pai. Na cidade havia 100 chiqueiros em 100 (11,4% casas que albergavam 406 suínos, em condições extremamente precárias. Em 300 (34,2% casas havia o antecedente de teníase em algum membro da família. O antecedente de convulsão foi relatado por 125 (14,2% famílias. O início das convulsões na idade adulta foi caracterizado em 39 (3 7,8% famílias e o antecedente de doenças mentais foi relatado em 53 (6% casas. Os exames parasitológicos de fezes mostraram ovos de Taenia spp em 24 (1,3% das 1850 amostras examinadas.

  17. Melting Behavior and Thermolysis of NaBH4−Mg(BH4)2 and NaBH4−Ca(BH4)2 Composites

    OpenAIRE

    Ley, Morten; Roedern, Elsa; Thygesen, Peter; Jensen, Torben

    2015-01-01

    The physical properties and the hydrogen release of NaBH 4 –Mg(BH 4 ) 2 and NaBH 4 −Ca(BH 4 ) 2 composites are investigated using in situ synchrotron radiation powder X-ray diffraction, thermal analysis and temperature programmed photographic analysis. The composite, x NaBH 4 –(1 − x )Mg(BH 4 ) 2 , x = 0.4 to 0.5, shows melting/frothing between 205 and 220 °C. However, the sample does not become a transparent molten phase. This behavior is similar to other alkali-alkaline earth metal borohydr...

  18. Oxygen isotope fractionation effects in soil water via interaction with cations (Mg, Ca, K, Na) adsorbed to phyllosilicate clay minerals

    Science.gov (United States)

    Oerter, Erik; Finstad, Kari; Schaefer, Justin; Goldsmith, Gregory R.; Dawson, Todd; Amundson, Ronald

    2014-07-01

    In isotope-enabled hydrology, soil and vadose zone sediments have been generally considered to be isotopically inert with respect to the water they host. This is inconsistent with knowledge that clay particles possessing an electronegative surface charge and resulting cation exchange capacity (CEC) interact with a wide range of solutes which, in the absence of clays, have been shown to exhibit δ18O isotope effects that vary in relation to the ionic strength of the solutions. To investigate the isotope effects caused by high CEC clays in mineral-water systems, we created a series of monominerallic-water mixtures at gravimetric water contents ranging from 5% to 32%, consisting of pure deionized water of known isotopic composition with homoionic (Mg, Ca, Na, K) montmorillonite. Similar mixtures were also created with quartz to determine the isotope effect of non-, or very minimally-, charged mineral surfaces. The δ18O value of the water in these monominerallic soil analogs was then measured by isotope ratio mass spectrometry (IRMS) after direct headspace CO2 equilibration. Mg- and Ca-exchanged homoionic montmorillonite depleted measured δ18O values up to 1.55‰ relative to pure water at 5% water content, declining to 0.49‰ depletion at 30% water content. K-montmorillonite enriched measured δ18O values up to 0.86‰ at 5% water content, declining to 0.11‰ enrichment at 30% water. Na-montmorillonite produces no measureable isotope effect. The isotope effects observed in these experiments may be present in natural, high-clay soils and sediments. These findings have relevance to the interpretation of results of direct CO2-water equilibration approaches to the measurement of the δ18O value of soil water. The adsorbed cation isotope effect may bear consideration in studies of pedogenic carbonate, plant-soil water use and soil-atmosphere interaction. Finally, the observed isotope effects may prove useful as molecular scale probes of the nature of mineral

  19. Increased frequency and severity of developmental deformities in rough-skinned newt (Taricha granulosa) embryos exposed to road deicing salts (NaCl and MgCl2)

    International Nuclear Information System (INIS)

    Hopkins, Gareth R.; French, Susannah S.; Brodie, Edmund D.

    2013-01-01

    Road-side aquatic ecosystems in North America are annually polluted with millions of tons of road deicing salts, which threaten the survival of amphibians which live and breed in these habitats. While much is known of the effects of NaCl, little is known of the second most-commonly used deicer, MgCl 2 , which is now used exclusively in parts of the continent. Here we report that environmentally relevant concentrations of both NaCl and MgCl 2 cause increased incidence of developmental deformities in rough-skinned newt hatchlings that developed embryonically in these salts. In addition, we provide some of the first quantification of severity of different deformities, and reveal that increased salt concentrations increase both deformity frequency and severity. Our work contributes to the growing body of literature that suggests salamanders and newts are particularly vulnerable to salt, and that the emerging pollutant, MgCl 2 is comparable in its effects to the more traditionally-used NaCl. - Highlights: ► Rough-skinned newt embryos were raised in NaCl and MgCl 2 road deicing salts. ► We quantified the frequency and severity of resulting developmental deformities. ► Both salts caused increased frequency and severity of developmental deformities. ► Effects of MgCl 2 , an emerging stressor, are comparable to traditionally-used NaCl. ► Newts and salamanders may be more susceptible to road salt than frogs and toads. - Two commonly used road deicing salts, NaCl and MgCl 2 , caused increased frequency and severity of developmental deformities in rough-skinned newt embryos.

  20. ETIČNE DILEME PODJETNIKA

    OpenAIRE

    Cvek, Tadej

    2010-01-01

    Etika in morala se skozi čas nenehno spreminjata in nekatere stvari, ki so danes nedovoljene, so bile še pred kratkim dovoljene in obratno. Razlog za to so predvsem družbene in kulturne spremembe, ki vodijo do drugačnih pogledov na stvari in okolico. Skladno z razvojem etike in morale, se razvijajo tudi nove etične teorije, ki še ne dosegajo starejših teorij a vendarle pridobivajo na pomembnosti in kdo ve, mogoče jih bodo kdaj v prihodnosti tudi presegle. Za MNP je pomembno, da razlikuje...

  1. Resistência ao cisalhamento e grau de intemperismo de cinco solos na região de Lavras (MG

    Directory of Open Access Journals (Sweden)

    W. W. Rocha

    2002-06-01

    Full Text Available Atualmente os parâmetros da resistência ao cisalhamento dos solos podem ser uma ferramenta muito útil na estabilização de taludes e recuperação de voçorocas, bem como na adoção de práticas mecânicas de conservação para os solos agrícolas. Com o objetivo de avaliar a resistência ao cisalhamento de cinco solos da região de Lavras (MG e sua relação com o grau de intemperismo, realizou-se um experimento, utilizando uma prensa de cisalhamento direto, a qual permite ensaiar amostras indeformadas de solos. Essas amostras foram coletadas na profundidade de 0-0,03 m e submetidas ao ensaio de cisalhamento, para a definição das envoltórias de resistência e obtenção da coesão aparente (C e o ângulo de atrito interno (φ. Observou-se que C, de forma geral, foi maior para solos que apresentaram maior densidade, umidade a -0,01 MPa e maior teor de areia. Os valores de (φ foram maiores nos solos com maiores teores de argila. O Latossolo Vermelho-Amarelo distrófico (LVAd e o Argissolo Vermelho-Amarelo distrófico típico (PVAd, com densidades do solo, teores de areia e umidade a -0,01MPa maiores, apresentaram maiores resistências ao cisalhamento em relação ao Latossolo Vermelho distrófico (LVd, Cambissolo Háplico Tb distrófico (CXbd e Latossolo Vermelho distroférrico (LVdf, que apresentaram maiores teores de argila e matéria orgânica. Para a classe dos Latossolos, a resistência ao cisalhamento foi maior onde os índices Ki e Kr foram mais elevados, graças à estrutura em blocos apresentada pelo LVAd, que condicionou maior resistência ao cisalhamento. Do ponto de vista da resistência ao cisalhamento, os solos LVAd e PVAd mostraram-se mais resistentes a voçorocamento e ao preparo do solo.

  2. Oxygen redox chemistry without excess alkali-metal ions in Na2/3[Mg0.28Mn0.72]O2.

    Science.gov (United States)

    Maitra, Urmimala; House, Robert A; Somerville, James W; Tapia-Ruiz, Nuria; Lozano, Juan G; Guerrini, Niccoló; Hao, Rong; Luo, Kun; Jin, Liyu; Pérez-Osorio, Miguel A; Massel, Felix; Pickup, David M; Ramos, Silvia; Lu, Xingye; McNally, Daniel E; Chadwick, Alan V; Giustino, Feliciano; Schmitt, Thorsten; Duda, Laurent C; Roberts, Matthew R; Bruce, Peter G

    2018-03-01

    The search for improved energy-storage materials has revealed Li- and Na-rich intercalation compounds as promising high-capacity cathodes. They exhibit capacities in excess of what would be expected from alkali-ion removal/reinsertion and charge compensation by transition-metal (TM) ions. The additional capacity is provided through charge compensation by oxygen redox chemistry and some oxygen loss. It has been reported previously that oxygen redox occurs in O 2p orbitals that interact with alkali ions in the TM and alkali-ion layers (that is, oxygen redox occurs in compounds containing Li + -O(2p)-Li + interactions). Na 2/3 [Mg 0.28 Mn 0.72 ]O 2 exhibits an excess capacity and here we show that this is caused by oxygen redox, even though Mg 2+ resides in the TM layers rather than alkali-metal (AM) ions, which demonstrates that excess AM ions are not required to activate oxygen redox. We also show that, unlike the alkali-rich compounds, Na 2/3 [Mg 0.28 Mn 0.72 ]O 2 does not lose oxygen. The extraction of alkali ions from the alkali and TM layers in the alkali-rich compounds results in severely underbonded oxygen, which promotes oxygen loss, whereas Mg 2+ remains in Na 2/3 [Mg 0.28 Mn 0.72 ]O 2 , which stabilizes oxygen.

  3. A CORRELATIONAL STUDY BETWEEN CHANGES IN SERUM ELECTROLYTES (NA, K, CL, MG AND ACUTE MYOCARDIAL INFARCTION COMPLICATION

    Directory of Open Access Journals (Sweden)

    Ketan Bharatbhai Parmar

    2017-08-01

    Full Text Available BACKGROUND The term "arrhythmia" refers to any change from the normal sequence of electrical impulses. The electrical impulses may happen too fast, too slowly or erratically causing the heart to beat too fast, too slowly or erratically. When the heart doesn't beat properly, it can't pump blood effectively. When the heart doesn't pump blood effectively, the lungs, brain and all other organs can't work properly and may shutdown or be damaged. Normally, the heart's most rapidly firing cells are in the sinus (or sino-atrial or SA node making that area a natural pacemaker. Under some conditions, almost all heart tissue can start an impulse of the type that can generate a heartbeat. Cells in the heart's conduction system can fire automatically and start electrical activity. This activity can interrupt the normal order of the heart's pumping activity. Secondary pacemakers elsewhere in the heart provide a "backup" rhythm when the sinus node doesn't work properly or when impulses are blocked somewhere in the conduction system. An arrhythmia occurs when the heart's natural pacemaker develops an abnormal rate or rhythm. The normal conduction pathway is interrupted. Another part of the heart takes over as pacemaker. The aim of the study is to observe the prevalence of various electrolyte (Na, K, Cl and Mg imbalances in complications of arrhythmias. MATERIALS AND METHODS This is a prospective study in which the patient admitted with signs and symptoms of cardiac arrhythmias diagnosed clinically, 100 cases were selected over 1 year. RESULTS The serum magnesium, sodium and potassium levels were significantly lower in the AMI patients at baseline and gradually becomes near normal on 4th day. K and Mg are showing significant difference between pre and post values in males and Mg show significant difference between pre and post values day 1 and day 5 in females with arrhythmia. CONCLUSION Persistent hyponatraemia is indication of worsening cardiac failure and

  4. Crystal structure of the high-affinity Na+,K+-ATPase–ouabain complex with Mg2+ bound in the cation binding site

    DEFF Research Database (Denmark)

    Laursen, Mette; Yatime, Laure; Nissen, Poul

    2013-01-01

    of ouabain and the side chains of αM1, αM2, and αM6. Furthermore, the structure reveals that cation transport site II is occupied by Mg2+, and crystallographic studies indicate that Rb+ and Mn2+, but not Na+, bind to this site. Comparison with the low-affinity [K2]E2–MgFx–ouabain structure [Ogawa et al...

  5. Beta-delayed proton emission from {sup 20}Mg

    Energy Technology Data Exchange (ETDEWEB)

    Lund, M.V.; Fynbo, H.O.U.; Howard, A.M.; Kirsebom, O.S.; Munch, M.; Riisager, K. [Aarhus University, Department of Physics and Astronomy, Aarhus C (Denmark); Andreyev, A.; Wadsworth, R. [University of York, Department of Physics, York (United Kingdom); Borge, M.J.G. [CSIC, Instituto de Estructura de la Materia, Madrid (Spain); CERN, ISOLDE, PH Department, Geneva 23 (Switzerland); Cederkaell, J. [Lund University, Department of Nuclear Physics, Lund (Sweden); Witte, H. de; Huyse, M.; Duppen, P. van [Instituut voor Kern- en Stralingsfysica, KU-Leuven, Leuven (Belgium); Fraile, L.M.; Vedia, V. [Universidad Complutense de Madrid, CEI Moncloa, Facultad de Ciencias Fisicas, Madrid (Spain); Greenlees, P.T.; Konki, J.; Rahkila, P. [University of Helsinki, Helsinki Institute of Physics, Helsinki (Finland); University of Jyvaeskylae, Department of Physics, Jyvaeskylae (Finland); Harkness-Brennan, L.J.; Judson, D.S.; Page, R.D. [University of Liverpool, Department of Physics, Oliver Lodge Laboratory, Liverpool (United Kingdom); Jonson, B.; Lindberg, S.; Nilsson, T. [Chalmers University of Technology, Department of Physics, Goeteborg (Sweden); Kurcewicz, J.; Madurga, M.; Rapisarda, E. [CERN, ISOLDE, PH Department, Geneva (Switzerland); Lazarus, I.; Pucknell, V. [STFC Daresbury, Daresbury, Warrington (United Kingdom); Lica, R. [CERN, ISOLDE, PH Department, Geneva (Switzerland); ' ' Horia Hulubei' ' National Institute of Physics and Nuclear Engineering, Magurele (Romania); Marginean, N.; Marginean, R.; Mihai, C.; Negret, A.; Pascu, S.; Rotaru, F.; Stanoiu, M.; Turturica, A. [' ' Horia Hulubei' ' National Institute of Physics and Nuclear Engineering, Magurele (Romania); Marroquin, I.; Nacher, E.; Perea, A.; Tengblad, O. [CSIC, Instituto de Estructura de la Materia, Madrid (Spain); Sotty, C. [Instituut voor Kern- en Stralingsfysica, KU-Leuven, Leuven (Belgium); ' ' Horia Hulubei' ' National Institute of Physics and Nuclear Engineering, Magurele (Romania); Warr, N. [Universitaet Koeln, Institut fuer Kernphysik, Koeln (Germany); Collaboration: IDS Collaboration

    2016-10-15

    Beta-delayed proton emission from {sup 20} Mg has been measured at ISOLDE, CERN, with the ISOLDE Decay Station (IDS) setup including both charged-particle and gamma-ray detection capabilities. A total of 27 delayed proton branches were measured including seven so far unobserved. An updated decay scheme, including three new resonances above the proton separation energy in {sup 20}Na and more precise resonance energies, is presented. Beta-decay feeding to two resonances above the Isobaric Analogue State (IAS) in {sup 20}Na is observed. This may allow studies of the 4032.9(2.4) keV resonance in {sup 19}Ne through the beta decay of {sup 20}Mg, which is important for the astrophysically relevant reaction {sup 15}O(α, γ){sup 19}Ne. Beta-delayed protons were used to obtain a more precise value for the half-life of {sup 20}Mg, 91.4(1.0) ms. (orig.)

  6. Phase Behavior of Aqueous NA-K-MG-CA-CI-NO3 Mixtures: Isopiestic Measurements and Thermodynamic Modeling

    Energy Technology Data Exchange (ETDEWEB)

    M.S. Gruszkiewiez; D.A. Palmer; R.D. Springer; P. Wang; A. Anderko

    2006-09-14

    A comprehensive model has been established for calculating thermodynamic properties of multicomponent aqueous systems containing the Na{sup +}, K{sup +}, Mg{sup 2+}, Ca{sup 2+}, Cl{sup -}, and NO{sub 3}{sup -} ions. The thermodynamic framework is based on a previously developed model for mixed-solvent electrolyte solutions. The framework has been designed to reproduce the properties of salt solutions at temperatures ranging from the freezing point to 300 C and concentrations ranging from infinite dilution to the fused salt limit. The model has been parameterized using a combination of an extensive literature database and new isopiestic measurements for thirteen salt mixtures at 140 C. The measurements have been performed using Oak Ridge National Laboratory's (ORNL) previously designed gravimetric isopiestic apparatus, which makes it possible to detect solid phase precipitation. Water activities are reported for mixtures with a fixed ratio of salts as a function of the total apparent salt mole fraction. The isopiestic measurements reported here simultaneously reflect two fundamental properties of the system, i.e., the activity of water as a function of solution concentration and the occurrence of solid-liquid transitions. The thermodynamic model accurately reproduces the new isopiestic data as well as literature data for binary, ternary and higher-order subsystems. Because of its high accuracy in calculating vapor-liquid and solid-liquid equilibria, the model is suitable for studying deliquescence behavior of multicomponent salt systems.

  7. Metallic elements (Ca, Hg, Fe, K, Mg, Mn, Na, Zn) in the fruiting bodies of Boletus badius.

    Science.gov (United States)

    Kojta, Anna K; Falandysz, Jerzy

    2016-06-01

    The aim of this study was to investigate and compare the levels of eight metallic elements in the fruiting bodies of Bay Bolete (Boletus badius; current name Imleria badia) collected from ten sites in Poland to understand better the value of this popular mushroom as an organic food. Bay Bolete fruiting bodies were collected from the forest area near the towns and villages of Kętrzyn, Poniatowa, Bydgoszcz, Pelplin, Włocławek, Żuromin, Chełmno, Ełk and Wilków communities, as well as in the Augustów Primeval Forest. Elements such as Ca, Fe, K, Mg, Mn, Na and Zn were analyzed by inductively coupled plasma atomic emission spectroscopy (ICP-OES), and mercury by cold vapor atomic absorption spectrometry (CV-AAS). This made it possible to assess the nutritional value of the mushroom, as well as possible toxicological risks associated with its consumption. The results were subjected to statistical analysis (Kruskal-Wallis test, cluster analysis, principal component analysis). Copyright © 2016 Elsevier Ltd. All rights reserved.

  8. Characterization of Anthraquinone-DerivedRedox Switchable Ionophores and Their Complexes with Li+, Na+, K+, Ca+, and Mg+ Metal Ions

    Directory of Open Access Journals (Sweden)

    Vaishali Vyas

    2011-01-01

    Full Text Available Anthraquinone derived redox switchable ionophores 1,5 bis (2-(2-(2-ethoxy ethoxy ethoxyanthracene-9,10-dione (V1 and 1,8-bis(2-(2-(2-ethoxyethoxyethoxy anthracene—9,10-dione (V2 have been used for isolation, extraction and liquid membrane transport studies of Li+, Na+, K+, Ca2+ and Mg2+ metal ions. These isolated complexes were characterized by melting point determination, CV and IR, 1H NMR spectral analysis. Ionophore V2 shows maximum shift in reduction potential (ΔE with Ca(Pic2. The observed sequence for the shifting in reduction potential (ΔE between V2 and their complexes is V2 calcium picrate (42 mV > V2 potassium picrate (33 mV > V2 lithium picrate (25 mV > V2 sodium picrate (18 mV > V2 magnesium picrate (15 mV. These findings are also supported by results of extraction, back extraction and transport studies. Ionophore V2 complexed with KPic and showed much higher extractability and selectivity towards K+ than V1. These synthetic ionophores show positive and negative cooperativity towards alkali and alkaline earth metal ions in reduced and oxidized state. Hence, this property can be used in selective separation and enrichment of metal ions using electrochemically driven ion transport.

  9. On chlorization of uranium and plutonium oxides in NaCl-KCl-MgCl2 molten eutectic

    International Nuclear Information System (INIS)

    Vorobej, M.P.; Desyatnik, V.N.; Pirogov, S.M.

    1978-01-01

    The chlorination process of U 3 O 8 , UO 2 , and PuO 2 in a melt of anhydrous NaCl-KCl-MgCl 2 with gaseous chlorine and carbon tetrachloride has been studied. The chlorination rate of uranium oxides has been studied within a temperature range 500-800 deg C at a chlorine feeding rate of 10 ml/min. Thermoqravimetric and X-ray analyses have shown that K 2 UO 2 Cl 4 compound is the final product of chlorination of uranium oxides. The mechanism of chlorination has been proposed. THe rate of PuO 2 chlorination has been studied within the same temperature range. It has been established that PuO 2 is readily chlorinated with CCl 4 vapours at a feeding rate of 10 ml/min. In contrast to uranium, chloride forms of plutonium in a highest oxidized state are unstable and are reduced in the melt to Pu(3) and Pu(4). The oxygen being released is retained by CCl 4 and by the products of CCl 4 pyrolysis

  10. Los elementos traza (Mg, Sr, Ha, Fe, Mn) en carbonatos: ambiente genético del Karst del techo de la unidad intermedia de la Cuenca neógena de Madrid.

    OpenAIRE

    Cañaveras Jiménez, Juan Carlos; Ordóñez Delgado, Salvador; Hoyos Gómez, Manuel; Calvo Sorando, José Pedro

    1992-01-01

    Este trabajo trata de caracterizar geoquímicamente el karst del techo de la U. Intermedia del Mioceno en las partes centrales de la Cuenca de Madrid. Para ello se han estudiado una serie de elementos traza (Mg, Sr, Na, Fe y Mn) mediante fluorescencia de rayos X. En base a este estudio se han distinguido dos tipos de procesos: De reemplazamiento y/o recristalización, que implican la litificación y homogeneización química de un sedimento calcítico-dolomítico; y procesos de precipitación química...

  11. Dielectronic satellites to the Ne-like yttrium resonance lines

    International Nuclear Information System (INIS)

    Osterheld, A.L.; Nilsen, J.; Khakhalin, S.Ya.; Faenov, A.Ya.; Pikuz, S.A.

    1996-01-01

    We present a detailed analysis of the spectrum of satellite transitions to the n=2-3 and n=2-4 Ne-like yttrium resonance lines. Satellite lines from the double excited 2s 2 2p 5 3l3l', 2s 2 2p 5 3l4l', 2s2p 6 3l3l' and 2s2p 6 3l4l' levels of Na-like Y as well as from 2s 2 2p 5 3l3l'3l '' and 2s2p 6 3l3l'3l '' levels of Mg-like Y were observed in spectra from a laser-produced plasma. The X-ray spectra were recorded with high spectral resolution λ/Δλ∼3500-5000 in the wavelength region of the n=2-3 Ne-like resonance lines and with λ/Δλ>1000 in the region of the n=2-4 Ne-like resonance lines. A total of more than 50 spectral features were identified, and their wavelengths were measured. A simple intensity model was developed, which agreed well with the measured spectra and assisted the line identification. The consistency of the model for different spectral regions demonstrates the potential of the Na-like and Mg-like satellite lines for diagnosing plasma conditions. (orig.)

  12. Aspectos epidemiológicos dateníase-cisticercose na área endêmica de Lagamar, MG

    Directory of Open Access Journals (Sweden)

    Mario León Silva-Vergara

    1995-12-01

    Full Text Available Um inquérito epidemiológico sobre teníase-cisticercose foi realizado em Lagamar- MG em 1992. Cadastradas 1109 casas com 3344 habitantes. O inquérito abrangeu 875 (86% famílias e foi respondido por um informante que, em 80% dos casos, foi o pai. Na cidade havia 100 chiqueiros em 100 (11,4% casas que albergavam 406 suínos, em condições extremamente precárias. Em 300 (34,2% casas havia o antecedente de teníase em algum membro da família. O antecedente de convulsão foi relatado por 125 (14,2% famílias. O início das convulsões na idade adulta foi caracterizado em 39 (3 7,8% famílias e o antecedente de doenças mentais foi relatado em 53 (6% casas. Os exames parasitológicos de fezes mostraram ovos de Taenia spp em 24 (1,3% das 1850 amostras examinadas.An epidemiological inquiry of human- cysticercosis due to Taenia solium was carried out in Lagamar, Minas Gerais State, Brazil, in 1992. A survey of 1109 houses with 3344. inhabitants was made. The inquiry included 875 (86% families and the questionaire was answered by an informer, who was the father in 80% of the cases. One hmidred pigsties, sheltering 406 swines in extremely precarious conditions, were found in 100 (11.4% houses. A history on taeniasis in some member of the family was verified in 300 (34.2% houses. A histoiy of seizures was referred to by 125 (14.2% of families. The outset of convulsion in adult age was characterized in 39 (37.8% families. A history of mental disorder was reported in 53 (6.0% of houses. Stool examinations were positive for Taenia spp in 24 (1.3% of samples examined.

  13. Laponite Na+0.7[(Si8Mg5.5Li0.3)O20(OH)4]–0.7

    Indian Academy of Sciences (India)

    Si8Mg5.5Li0.3)O20(OH)4]–0.7. Negative charges are counterbalanced by Na+ ions present in the interlayer. Electrostatic screening length at pH 10 ≈30 nm. Effective maximum volume increases by a factor of 60. Thus, for less than 1 volume ...

  14. Análise do Programa de Desenvolvimento do Turismo do Nordeste (Prodetur/NE na perspectiva do planejamento estratégico Analysis of the Tourism Development Program (Pordetur/NE

    Directory of Open Access Journals (Sweden)

    Maria das Graças de Menezes Venâncio Paiva

    2010-04-01

    Full Text Available Este artigo analisa o Programa de Desenvolvimento do Turismo no Nordeste (Prode-tur/NE. A análise será feita dentro de uma perspectiva crítica que busca entender sua estrutura de gerenciamento. O programa é baseado em uma abordagem de autossustentabilidade e num moderno gerenciamento que supõe planejamento participativo e estratégico envolvendo parceria e ampla rede a alianças. Somente um elevado grau de consciência entre os vários atores nordestinos poderá garantir o sucesso do programa, o que implica consciência de todos eles em relação à interdependência entre os governos federal, estadual e municipal, bem com o empresariado e as organizações não governamentais (ONGs.This article analyzes the Northeastern Tourism Development Program (Prodetur/NE through a critical perspective seeking to understand its management structure. The program is based on a self-sustainability and modern management approach which assumes participatory and strategic planning involving partnership and a wide alliance network. Only a great dealof consciousness by the different Northeastern actors can guarantee the success of the program. All must be aware of the interdependence between federal, state and local governments, as well as businessmen and non-governmental organizations (NGOs.

  15. Neutron activation analysis of Ca, Cl, K, Mg, Mn, Na, P, and Sr contents in the crowns of human permanent teeth

    International Nuclear Information System (INIS)

    Zaichick, V.

    2009-01-01

    The effect of age and gender on chemical element contents in intact crowns of permanent teeth of 84 apparently healthy 15-55 year old women (n 38) and men (n = 46) was investigated. Mass fractions of Ca, Cl, K, Mg, Mn, Na, P, and Sr in crowns were determined by instrumental neutron activation analysis using short-lived radionuclides. Mean values (M ± SEL) for female and male combined were (on dry weight basis): 350 ± 5 g/kg, 2920± 150 mg/kg, 839 ± 80 mg/kg, 4880 ± 240 mg/kg, 3.20 ± 0.30 mg/kg, 6240 ± 140 mg/kg, 181 ± 4 g/kg, and 293 ± 24 mg/kg respectively. A statistically significant decrease of Sr (P ≤ 0.01) and increase of Na (P ≤ 0.01) content in the tooth crowns with age was found for women. Sex-related comparison did not show any differences. (author)

  16. Evolution of Microstructure in Rolled Mg-Based Alloy. Textural Aspect / Ewolucja Mikrostruktury W Walcowanym Stopie Na Bazie Mg. Aspekt Teksturowy

    Directory of Open Access Journals (Sweden)

    Drzymała P.

    2015-12-01

    Full Text Available Magnesium alloys are the lightest structural materials, which makes them particularly suitable for use in the aircraft and automotive industry. However, due to hexagonal close-packed crystal structure, resulting in insufficient number of independent slip systems, magnesium alloys exhibit poor formability at room temperature. Conventional methods of work hardening of magnesium alloys requires the temperature about 300°C, which favours simultaneously processes of thermal recovery and grain growth, but decreases beneficial microstructure strengthening effect. Thus, it is a crucial to undertake development of a technology for semi-finished magnesium alloys elements, which will ensure better mechanical properties of the final products by forming desirable microstructure. In the paper we present the development of crystallographic texture of the Mg-based alloy (Mg-AZ31 in the form of pipe extruded at 430°C and subjected to pilger rolling at relatively low temperature.

  17. PROPOSTA DE TRATAMENTO ALTERNATIVO PARA RESÍDUOS SÓLIDOS URBANOS NA CIDADE DE UBERLÂNDIA – MG

    Directory of Open Access Journals (Sweden)

    Caroline Ferreira de Morais

    2014-12-01

    Full Text Available O aterro sanitário é o principal meio de disposição final para os resíduos sólidos urbanos de Uberlândia. Alternativas, além das que estão em desenvolvimento no município, precisam ser pensadas já que o aterramento é uma opção com grandes impactos ao meio ambiente. Sendo assim, essa pesquisa tem como objetivo desenvolver uma proposta para a cidade de Uberlândia com uma nova alternativa de tratamento de resíduos sólidos urbanos que não priorize o seu aterramento e que traga maiores ganhos socioambientais. A metodologia consistiu em trabalhos de campo, levantamentos bibliográficos e referenciais, o qual baseou a elaboração da proposta com a adoção da tecnologia do Projeto Natureza Limpa, desenvolvido por uma empresa particular, localizada no município de Unaí – MG. A escolha da tecnologia teve como requisitos aquela que não priorizasse o aterramento de resíduos sólidos urbanos em seu processo. Portanto, os resultados são diminuição de emissões de gases de efeito estufa, aproveitamento do potencial energético da biomassa, retorno de matéria-prima ao mercado produtivo e ainda diminuição ou extinção de impactos ambientais decorrentes da má disposição dos resíduos. Consequentemente, os ganhos sociais se pautam na melhoria da saúde ambiental e o uso pela governança municipal de saldos creditícios positivos em benefício comum.

  18. Radioactivity of β / γ and the Content of Ca, Fe, Mn, Mg, Na on the Spring of Ponorogo East Java Lime Area

    International Nuclear Information System (INIS)

    Sutjipto

    2002-01-01

    Radioactivity of β / γ and the content of Ca, Fe, Mn, Mg, Na on the source of Ponorogo East-Java lime area has been studied. This research was carried out to know radioactivity of β / γ and the content of Ca, Fe, Mn, Mg, Na on the spring of different three places were Ngebel-lake source, Ngembak source and Gonggang source. Samples taken, preparation and analysis based on the procedures of environmental radioactivity analysis and water sampling guidelines. The instrument used for the analysis radioactivity were low level β counter modified P3TM-BATAN Yogyakarta with detector GM and spectrometer γ with detector Ge(Li). Radioactivity of β (gross) from the source of different three places (β ≤ 1 Bq/L) are lower than the value of PPRI No. 20/1990. Radioactivity of γ comes from the natural radionuclides of Tl-208 and K-40 are lower than 1 Bq/L for the different of three places, respectively. The metals concentration of Ngebel-lake source were Ca ≤ 14.34 ppm; Fe ≤ 0.04 ppm; Mn ≤ 0.02 ppm; Mg ≤ 6.75 ppm; Na ≤ 14.63 ppm, Ngembak source were Ca ≤ 11.6 ppm; Fe ≤ 0.04 ppm; Mn ≤ 0.02 ppm; Mg ≤ 11.13 ppm; Na ≤ 16.75 ppm and Gonggang source were Ca ≤ 13.78 ppm; Fe ≤ 0.26 ppm; Mn ≤ 0.02 ppm; Mg ≤ 6.13 ppm; Na ≤ 15.00 ppm. The water of Ngebel-lake source, Ngembak source and Gonggang source can be classified as B category water based on radioactivity and the content of the metals concentration in its. (author)

  19. Crystal structure of the high-affinity Na+K+-ATPase-ouabain complex with Mg2+ bound in the cation binding site.

    Science.gov (United States)

    Laursen, Mette; Yatime, Laure; Nissen, Poul; Fedosova, Natalya U

    2013-07-02

    The Na(+),K(+)-ATPase maintains electrochemical gradients for Na(+) and K(+) that are critical for animal cells. Cardiotonic steroids (CTSs), widely used in the clinic and recently assigned a role as endogenous regulators of intracellular processes, are highly specific inhibitors of the Na(+),K(+)-ATPase. Here we describe a crystal structure of the phosphorylated pig kidney Na(+),K(+)-ATPase in complex with the CTS representative ouabain, extending to 3.4 Å resolution. The structure provides key details on CTS binding, revealing an extensive hydrogen bonding network formed by the β-surface of the steroid core of ouabain and the side chains of αM1, αM2, and αM6. Furthermore, the structure reveals that cation transport site II is occupied by Mg(2+), and crystallographic studies indicate that Rb(+) and Mn(2+), but not Na(+), bind to this site. Comparison with the low-affinity [K2]E2-MgF(x)-ouabain structure [Ogawa et al. (2009) Proc Natl Acad Sci USA 106(33):13742-13747) shows that the CTS binding pocket of [Mg]E2P allows deep ouabain binding with possible long-range interactions between its polarized five-membered lactone ring and the Mg(2+). K(+) binding at the same site unwinds a turn of αM4, dragging residues Ile318-Val325 toward the cation site and thereby hindering deep ouabain binding. Thus, the structural data establish a basis for the interpretation of the biochemical evidence pointing at direct K(+)-Mg(2+) competition and explain the well-known antagonistic effect of K(+) on CTS binding.

  20. The influence of some additives to the highly carbohydrate diet on the distribution of Al, Ca, Mg, Mn and Na in teeth enamel and bones of experimental animals

    International Nuclear Information System (INIS)

    Bakyrdzhiev, P.

    1985-01-01

    An instrument neutron activation analysis had been used for the investigation of diets with different salt and permanent basic composition. The diets with MgCl 2 and methylene blue additives were used. Three groups of animals Wistar, Hamster and S. Dawley with different genetic reactivity had been fed on adlibidum for 45 days. After killing the animals the teeth enamel, mandibula and tibia had been sampled and content of Al, Mg, Mn, Na and Cl 2 was determined by means of INAA. The samples were irradiated for 1 min in the rabbit system of the experimental reactor IRT-2000. Two measurements were carried out - after a cooling time of 1 min for the determination of Al, Ca, Cl 2 , Mg, and after 2 h cooling time - for Na and Mn. The precision of the analysis was between 4 and 12%

  1. EFFECT OF MgO ON THE COMPOSITION AND PROPERTIES OF BELITE-BARIUM CALCIUM SULPHOALUMINATE CEMENT IN THE PRESENCE OF Na2O AND K2O

    Directory of Open Access Journals (Sweden)

    Jie Zhang

    2015-06-01

    Full Text Available The purpose of this study is to explore the effect of MgO (1 - 9 wt. % on the composition and properties of belite-barium calcium sulphoaluminate cement with additions of Na2O and K2O. The results show that 1 - 5 wt. % content of MgO can stabilize crystal types of M3-C3S, R-C3S and β-C2S. Moreover, MgO can promote the formation of C3S and C4AF, but has little effect on the formation of C2.75B1.25A3$ and C3A. The C3A/C4AF ratio is reduced by 22 % at 5 wt. % MgO, which indicates that appropriate MgO can decrease the liquid viscosity. In the presence of Na2O and K2O, the highest limit of incorporated amount of MgO is about 3 wt. %, which is higher than that in Portland cement clinker of 2 wt. %. Besides, MgO favors the formation of small C3S crystals in size of 4 - 20 μm. MgO enhances the hydration rate and mechanical property of cement at an optimal dosage (1 - 5 wt. %, beyond which an adverse effect could be resulted. At a MgO dosage of 5 wt. %, the compressive strengths of the cement at 1, 3, 7 and 28 days are 15.8, 39.3, 68.6 and 97.3 MPa, which increases by 116 %, 17 %, 10 % and 6 % respectively compared to the cement without MgO dopant. This study could lead to the effective use of magnesia-rich limestone in industrial production of belite-barium calcium sulphoaluminate cement.

  2. Characterization of sodium transport in Acholeplasma laidlawii B cells and in lipid vesicles containing purified A. laidlawii (Na+-Mg2+)-ATPase by using nuclear magnetic resonance spectroscopy and 22Na tracer techniques

    International Nuclear Information System (INIS)

    Mahajan, S.; Lewis, R.N.; George, R.; Sykes, B.D.; McElhaney, R.N.

    1988-01-01

    The active transport of sodium ions in live Acholeplasma laidlawii B cells and in lipid vesicles containing the (Na+-Mg2+)-ATPase from the plasma membrane of this microorganism was studied by 23Na nuclear magnetic resonance spectroscopic and 22 Na tracer techniques, respectively. In live A. laidlawii B cells, the transport of sodium was an active process in which metabolic energy was harnessed for the extrusion of sodium ions against a concentration gradient. The process was inhibited by low temperatures and by the formation of gel state lipid in the plasma membrane of this organism. In reconstituted proteoliposomes containing the purified (Na+-Mg2+)-ATPase, the hydrolysis of ATP was accompanied by the transport of sodium ions into the lipid vesicles, and the transport process was impaired by reagents known to inhibit ATPase activity. At the normal growth temperature (37 degrees C), this transport process required a maximum of 1 mol of ATP per mol of sodium ion transported. Together, these results provide direct experimental evidence that the (Na+-Mg2+)-ATPase of the Acholeplasma laidlawii B membrane is the cation pump which maintains the low levels of intracellular sodium characteristic of this microorganism

  3. Structure of Na2O·MO·SiO2·CaF2 (M=Mg, Ca) oxyfluoride glasses

    International Nuclear Information System (INIS)

    Cheng Jinshu; Deng Wei; Wang Mitang

    2012-01-01

    (9-x)CaO·xMgO·15Na 2 O·60SiO 2 ·16CaF 2 (x=0, 2, 4, 6, and 9) oxyfluoride glasses were prepared. Utilizing the Raman scattering technique together with 29 Si and 19 F MAS NMR, the effect of alkaline metal oxides on the Q species of glass was characterized. Raman results show that as magnesia is added at the expense of calcium oxide, the disproportional reaction Q 3 →Q 4 +Q 2 (Q n is a SiO 4 tetrahedron with n bridging oxygens) prompted due to the high ionic field strength of magnesia, magnesium oxide entered into the silicate network as tetrahedral MgO 4 , and removed other modifying ions for charge compensation. This reaction was confirmed by 29 Si MAS NMR. 19 F MAS NMR results show that fluorine exists in the form of mixed calcium sodium fluoride species in all glasses and no Si-F bonds were formed. As CaO is gradually replaced by MgO (x=6, 9), a proportion of the magnesium ions combines with fluorine to form the MgF + species. Meanwhile, some part of Na + ions complex F - in the form of F-Na(6).

  4. Synthesis, crystal structure and spectroscopy properties of Na 3AZr(PO 4) 3 ( A=Mg, Ni) and Li 2.6Na 0.4NiZr(PO 4) 3 phosphates

    Science.gov (United States)

    Chakir, M.; El Jazouli, A.; de Waal, D.

    2006-06-01

    Na 3AZr(PO 4) 3 ( A=Mg, Ni) phosphates were prepared at 750 °C by coprecipitation route. Their crystal structures have been refined at room temperature from X-ray powder diffraction data using Rietveld method. Li 2.6Na 0.4NiZr(PO 4) 3 was synthesized through ion exchange from the sodium analog. These materials belong to the Nasicon-type structure. Raman spectra of Na 3AZr(PO 4) 3 ( A=Mg, Ni) phosphates present broad peaks in favor of the statistical distribution in the sites around PO 4 tetrahedra. Diffuse reflectance spectra indicate the presence of octahedrally coordinated Ni 2+ ions.

  5. Raman microspectroscopic study of effects of Na(I) and Mg(II) ions on low pH induced DNA structural changes.

    Science.gov (United States)

    Muntean, C M; Segers-Nolten, G M J

    2003-01-01

    In this work a confocal Raman microspectrometer is used to investigate the influence of Na(+) and Mg(2+) ions on the DNA structural changes induced by low pH. Measurements are carried out on calf thymus DNA at neutral pH (7) and pH 3 in the presence of low and high concentrations of Na(+) and Mg(2+) ions, respectively. It is found that low concentrations of Na(+) ions do not protect DNA against binding of H(+). High concentrations of monovalent ions can prevent protonation of the DNA double helix. Our Raman spectra show that low concentrations of Mg(2+) ions partly protect DNA against protonation of cytosine (line at 1262 cm(-1)) but do not protect adenine and guanine N(7) against binding of H(+) (characteristic lines at 1304 and 1488 cm(-1), respectively). High concentrations of Mg(2+) can prevent protonation of cytosine and protonation of adenine (disruption of AT pairs). By analyzing the line at 1488 cm(-1), which obtains most of its intensity from a guanine vibration, high magnesium salt protect the N(7) of guanine against protonation. A high salt concentration can prevent protonation of guanine, cytosine, and adenine in DNA. Higher salt concentrations cause less DNA protonation than lower salt concentrations. Magnesium ions are found to be more effective in protecting DNA against binding of H(+) as compared with calcium ions presented in a previous study. Divalent metal cations (Mg(2+), Ca(2+)) are more effective in protecting DNA against protonation than monovalent ions (Na(+)). Copyright 2003 Wiley Periodicals, Inc. Biopolymers (Biospectroscopy) 72: 000-000, 2003

  6. Uso de imagens de satélite como suporte à estimativa da demanda hídrica na sub-bacia do Rio Urucuia, MG

    OpenAIRE

    Silva, Lorena Santos Cordeiro da

    2014-01-01

    O objetivo deste trabalho foi estimar a demanda hídrica destinada à irrigação na sub-bacia Urucuia, MG, utilizando dados de sensoriamento remoto e comparar os resultados obtidos com a disponibilidade hídrica da sub-bacia. Para estimativa da demanda hídrica foi calculada a evapotranspiração de referência a partir dos dados coletados da Plataforma de Coleta de Dados (PCD) do município de Santa Fé de Minas e, posteriormente, foi calculada a evapotranspiração das culturas existentes na área. Atra...

  7. Improvement of corrosion resistance in NaOH solution and glass forming ability of as-cast Mg-based bulk metallic glasses by microalloying

    Directory of Open Access Journals (Sweden)

    Peng Hao

    2011-02-01

    Full Text Available The influences of the addition of Ag on the glass forming ability (GFA and corrosion behavior were investigated in the Mg-Ni-based alloy system by X-ray diffraction (XRD and electrochemical polarization in 0.1 mol/L NaOH solution. Results shows that the GFA of the Mg-Ni-based BMGs can be improved dramatically by the addition of an appropriate amount of Ag; and the addition element Ag can improve the corrosion resistance of Mg-Ni-based bulk metallic glass. The large difference in atomic size and large negative mixing enthalpy in alloy system can contribute to the high GFA. The addition element Ag improves the forming speed and the stability of the passive film, which is helpful to decrease the passivation current density and to improve the corrosion resistance of Mg-Ni-based bulk metallic glass.

  8. Cafeína (150 mg/kg y aprendizaje espacial (retención y adquisición en ratones

    Directory of Open Access Journals (Sweden)

    María del Pilar Santacruz

    2003-01-01

    Full Text Available En este trabajo se evaluó el papel que juega la cafeína (150mg/kg en el aprendizaje espacial (adquisición y retención en ratones mediante las mediciones de la latencia de salida, velocidad, aciertos, regresos, errores y excretas en un laberinto de 3 x 3 metros. Los sujetos fueron moldeados para una ruta en el laberinto y luego se aleatorizaron 20 machos y 20 hembras para la administración de cafeína (s.c. y solución salina durante ocho días consecutivos; luego se observó la retención de este aprendizaje y se moldeó otra ruta para evaluar su retención 24 horas después: La cafeína incrementó la retención del aprendizaje 1, donde hubo los mayores aciertos, y en el segundo las hembras con cafeína exhibieron mayor velocidad y aciertos mientras que los machos, presentaron menores aciertos y velocidad que todos los grupos; como vemos, en el segundo caso, la cafeína fortaleció la retención del aprendizaje 2 en las hembras y la debilitó en los machos. Se concluye que la cafeína (150mg/kg influyó positivamente en la retención del aprendizaje espacial, mas no en la adquisición. Este artículo está asociado a la línea de investigación en Cafeína y Cognición de la Universidad de la Sabana.

  9. New structural family of ternary molybdates NaA3R(MoO4)5, where A is Mg, Mn, Co or Ni and R is Al, In, Cr or Fe

    International Nuclear Information System (INIS)

    Kozhevnikova, N.M.; Kotova, I.Yu

    1998-01-01

    Ternary NaA 3 R(MoO 4 ) 5 molybdates belonging to a new structural family are produced by crystallization from melted solution and by solid-phase synthesis method. NaMg 3 In(MoO 4 ) 5 , NaNi 3 Al(MoO 4 ) 5 and NaCo 3 Al(MoO 4 ) 5 single crystals are grown. Crystallographic and thermal characteristics of NaA 3 R(MoO 4 ) 5 are determined. Structural similarities in MgMoO 4 , NaIn(MoO 4 ) 2 , Na 2 Mg(MoO 4 ) 6 and NaA 3 R(MoO 4 ) 5 series are revealed [ru

  10. The effect of age on Br, Ca, Cl, K, Mg, Mn, and Na mass fraction in pediatric and young adult prostate glands investigated by neutron activation analysis

    International Nuclear Information System (INIS)

    Zaichick, Vladimir; Zaichick, Sofia

    2013-01-01

    The effect of age on chemical element mass fractions in intact prostate of 50 apparently healthy 0–30 year old males was investigated by neutron activation analysis with high resolution spectrometry of short-lived radionuclides. Mean values (M±SΕΜ) for mass fraction (mg kg −1 , dry mass basis) of chemical elements before the time of puberty and in the period of puberty and post-puberty were: Br 46.0±6.7, Ca 1151±140, Cl 14572±700, K 10147±700, Mg 771±131, Mn 2.13±0.25, Na 9880±659 and Br 29.0±4.6, Ca 2049±364, Cl 11518±1121, K 13029±542, Mg 1186±134, Mn 1.74±0.16, Na 9887±716, respectively. A tendency of age-related increase in Ca, K, and Mg mass fraction and of age-related decrease in Br mass fraction was observed in period of life from 0 to 30 years. This new data indicates that of the elements studied, only the Ca, K, and Mg mass fraction in prostate tissue is an androgen-dependent parameter

  11. Razlika između klasične i keynesijanske ekonomske doktrine u 20. stoljeću s implikacijama na hrvatsku tranziciju

    OpenAIRE

    Brumec, Dino

    2017-01-01

    U dvadeseto stoljeće svijet je ušao s nepoljuljanom vjerom u snagu slobodnog tržišta koje će regulirati odnose među ljudima na svakoj razini. Prvi znanstvenik koji se suprostavio toj vjeri na jasno strukturiran način bio je John Maynard Keynes koji je ponudio državi doktrinu u kojoj njeno djelovanje ima velik prostor te je u vrlo kratkom roku postao najutjecajniji ekonomist na svijetu. Nasuprot njemu stajao je Friedrich Hayek koji je državi nudio mnogo manje utjecaja u gos...

  12. The 12C + 12C: 1. Decay into high spin states of 23Mg, and 23Na. 2. Hauser-Feshbach analysis of the reaction mechanism

    International Nuclear Information System (INIS)

    Denhoefer, G.

    1980-01-01

    In this thesis different aspects of the reaction 12 C + 12 C were studied. The first part deals with high spin states in the mirror nucki 23 Na and 23 Mg experially with the states resonantly populated at Esub(cm) = 19.3 MeV. For the state at 9.80 MeV in 23 Na with (p,γ) angular correlation measurements a spin of 17/2 + and by Doppler form analysis a lifetime of (21 +- 9)fs was found. The probably analogous state at 9.61 MeV in 23 Mg decays both under p-emission to 22 Na and under γ-emission. Because of the p-decay probabilities to 3 + and 4 + of 22 Na, which were observed in (p,n) coincidence measurements, it has also the spin 17/2 + . In the second part of this thesis it was studied whether the reaction 12 C + 12 C at incident energies between 26 MeV and 42 MeV can be described using the statistical model. (orig./HSI) [de

  13. Advanced Time-Delayed Coincidence Studies of $^{31,32}$Mg from the $\\beta$-decays of $^{31,32}$Na

    CERN Multimedia

    Marechal, F; Plociennik, W A

    2002-01-01

    It is proposed to study the lifetime of the 2$_{1}^{+}$ 885.4 keV state in $^{32}$Mg by means of Advanced Time-Delayed $\\beta \\gamma \\gamma$(t) method with the precision in the half-life value of about $\\pm$ 1.5 ps. This would be an independent verification of the B(E2; 0$_{1}^{+} \\rightarrow$ 2$_{1}^{+}$) values obtained so far in a few studies using Coulomb excitations at intermediate beam energies. The advantage of time-delayed coincidence measurements is that they are free of corrections used in the Coulex studies, which strongly affect the deduced B(E2) results. In addition, we propose to study the lifetimes or lifetime limits of other states in nuclei populated in the decays of $^{31}$Na and $^{32}$Na, specifically focusing on the intruder negative parity band in $^{31}$Mg. As a side benefit to this investigation we expect high-quality $\\gamma \\gamma$ coincidences to reveal new excited states in both $^{31}$Mg and $^{32}$Mg. Our results from a brief test-measurement yield a lifetime of T$_{1/2}$ = 10.5(...

  14. Shape coexistence in the N=19 neutron-rich nucleus 31Mg explored by β–γ spectroscopy of spin-polarized 31Na

    Directory of Open Access Journals (Sweden)

    H. Nishibata

    2017-04-01

    Full Text Available The structure of excited states in the neutron-rich nucleus 31Mg, which is in the region of the “island of inversion” associated with the neutron magic number N=20, is studied by β–γ spectroscopy of spin-polarized 31Na. Among the 31Mg levels below the one neutron separation energy of 2.3 MeV, the spin values of all five positive-parity levels are unambiguously determined by observing the anisotropic β decay. Two rotational bands with Kπ=1/2+ and 1/2− are proposed based on the spins and energies of the levels. Comparison on a level-by-level basis is performed between the experimental results and theoretical calculations by the antisymmetrized molecular dynamics (AMD plus generator coordinate method (GCM. It is found that various nuclear structures coexist in the low excitation energy region in 31Mg.

  15. Activity determination of Na+ K+ - ATPase and Mg++ - ATPase enzymes in the gill of Poecilia vivipara (Osteichthyes, Cyprinodontiformes in different salinities

    Directory of Open Access Journals (Sweden)

    Marcelo da Cunha Amaral

    2001-03-01

    Full Text Available This work aimed to know the tolerance mechanisms through the salinity variation by Na+ K+ - ATPase and Mg++ - ATPase and enzymes encountered in the gills of Poecilia vivipara. In field, the presence of this species was observed in salinities of 0 and 28‰. In laboratory, these fish were maintained in aquarium with mean salinity of 30‰ and positive responses were obtained. Some adult specimens, collected in a lagoon of the Coqueiros Beach, were utilized as matrixes. In the experiments the specimens used were those born in the test aquarium. For each salinity studied three replicates were made with three specimens for each one. The alevins were maintained in salinities of 5, 10, 15, 20, 25, 30 and 35‰ during a month for adaptation. Gills were extracted in appropriate buffer for isolation of plasma membrane and used for specific dosage of the total enzymatic activity of Na+ K+ - ATPase and Mg++ - ATPase. The relation of alevins to their adaptation towards the salinity variation was also studied. The activity of the two enzymes showed a different result. The major expression of Na+ K+ - ATPase was observed in 20‰ (35 µmoles Pi.mg protein.h-1, the best salinity to cultivate P. vivipara.Este trabalho teve como objetivo conhecer os mecanismos de tolerância às variações de salinidade, pelas enzimas Mg++ - ATPase e Na+ K+ - ATPase, encontrada nas brânquias de Poecilia vivipara. No campo, foi observada a presença desta espécie em salinidades entre 0 e 28‰. No laboratório, os indivíduos foram mantidos em salinidade de 30‰ e responderam positivamente. Os indivíduos adultos, coletados em uma lagoa na praia dos Coqueiros, foram utilizados como matrizes. Nos experimentos foram usados alevinos que nasceram nos aquários testes. Para cada salinidade estudada foram feitas três réplicas com três espécimens em cada uma. Os alevinos foram mantidos em salinidades de 5, 10, 15, 20, 25, 30 e 35‰, durante um mês para total adaptação. As br

  16. Geology, petrology and U-Pb geochronology of Serra da Rajada Granitic Pluton: implications about ediacaran magmatic evolution in NE portion of the Rio Piranhas-Serido Domain (NE of Borborema Province); Geologia, petrologia e geocronologia U-Pb do Pluton Granitico Serra da Rajada: implicacoes sobre a evolucao magmatica ediacarana na porcao do Dominio Rio Piranhas-Serido (NE da Provincia Borborema)

    Energy Technology Data Exchange (ETDEWEB)

    Costa, Alan Pereira da; Dantas, Alexandre Ranier, E-mail: alan.costa@cprm.gov.br, E-mail: alexandre.dantas@cprm.gov.br [Servico Geologico do Brasil (CPRM), Natal, RN (Brazil). Nucleo de Apoio de Natal/Superintendencia Regional de Recife; Nascimento, Marcos Antonio Leite do; Galindo, Antonio Carlos, E-mail: marcos@geologia.ufrn.br, E-mail: galindo@geologia.ufrn.br [Universidade Federal do Rio Grande do Norte (UFRN), Natal, RN (Brazil). Departamento de Geologia

    2015-12-15

    The Ediacaran plutonic activity, related to the Brazilian/Pan-African orogeny, is one of the most important geological features in the Borborema Province, formed by batholiths, stocks and dikes. The Serra da Rajada Granitic Pluton (SRGP), located in the central portion of the Rio Piranhas-Serido Domain, is an example of these bodies. This site is the target of cartographic, petrographic, lithochemical and geochronological studies. Its rocks are described as monzogranites consisting of K-feldspar, plagioclase (oligoclase-An{sub 23-24%}), quartz and biotite (main mafic), having as accessory minerals opaque, titanite, allanite, apatite and zircon. Chlorite, white mica and carbonate are alteration minerals. Lithochemical data from 15 samples show quite evolved rocks (SiO{sub 2} , 69% to 75%), rich in alkalis (Na{sub 2}O + K{sub 2}O ≥ 8.0%), depleted in MgO (≤ 0.45%), CaO (≤ 1.42%) and TiO{sub 2} (≤ 0.36%), and displaying moderate levels of Fe{sub 2}O{sub 3} t (2.16 to 3.53%). These rocks present a transitional nature between metaluminous and peraluminous (predominance of the latter) and have subalkaline/monzonitic affinity (high-K Calc-alkaline). Harker diagrams represent negative correlations in Fe{sub 2}O{sub 3}t, MgO and CaO, indicating fractionation of mafic and plagioclase. The REE spectrum show enrichment of light in relation to heavy REE (LaN/YbN = 23.70 to 10.13), with negative anomaly in Eu (Eu/ Eu* = 0.70 to 10.13) suggesting fractionation or accumulation in the feldspars source (plagioclase). Data integration allows correlating the SRGP rocks with those described as Equigranular high-K Calc-alkaline Suite. The U-Pb geochronology and Sm-Nd isotope dating indicate that the biotite monzogranite have a crystallization age of 557 ± 13 Ma and TDM model age of 2.36 Ga, respectively, and ε{sub Nd} value of - 20.10 for the crystallization age, allowing to infer a crustal source for the magma generated in the Paleoproterozoic age. (author)

  17. Improving the Performance of Layered Oxide Cathode Materials with Football-Like Hierarchical Structure for Na-Ion Batteries by Incorporating Mg2+ into Vacancies in Na-Ion Layers.

    Science.gov (United States)

    Li, Zheng-Yao; Wang, Huibo; Chen, Dongfeng; Sun, Kai; Yang, Wenyun; Yang, Jinbo; Liu, Xiangfeng; Han, Songbai

    2018-04-09

    The development of advanced cathode materials is still a great interest for sodium-ion batteries. The feasible commercialization of sodium-ion batteries relies on the design and exploitation of suitable electrode materials. This study offers a new insight into material design to exploit high-performance P2-type cathode materials for sodium-ion batteries. The incorporation of Mg 2+ into intrinsic Na + vacancies in Na-ion layers can lead to a high-performance P2-type cathode material for sodium-ion batteries. The materials prepared by the coprecipitation approach show a well-defined morphology of secondary football-like hierarchical structures. Neutron power diffraction and refinement results demonstrate that the incorporation of Mg 2+ into intrinsic vacancies can enlarge the space for Na-ion diffusion, which can increase the d-spacing of the (0 0 2) peak and the size of slabs but reduce the chemical bond length to result in an enhanced rate capability and cycling stability. The incorporation of Mg 2+ into available vacancies and a unique morphology make Na 0.7 Mg 0.05 Mn 0.8 Ni 0.1 Co 0.1 O 2 a promising cathode, which can be charged and discharged at an ultra-high current density of 2000 mA g -1 with an excellent specific capacity of 60 mAh g -1 . This work provides a new insight into the design of electrode materials for sodium-ion batteries. © 2018 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim.

  18. Crystal structures of the solid solutions Na3Zn0.912Cd0.088B5O10 and Na3Zn0.845Mg0.155B5O10

    Directory of Open Access Journals (Sweden)

    Xue-An Chen

    2017-11-01

    Full Text Available Two new pentaborates, trisodium zinc cadmium pentaborate, Na3Zn0.912Cd0.088B5O10, and trisodium zinc magnesium pentaborate, Na3Zn0.845Mg0.155B5O10, have been synthesized by high-temperature solution reactions at 1023 K. Their crystal structures were determined by single-crystal X-ray diffraction. Both solid solutions crystallize in the orthorhombic form of the parent compound Na3ZnB5O10 (space group type Pbca, Z = 8 and contain the double ring [B5O10]5− anion composed of one BO4 tetrahedron and four BO3 triangles as the basic structural motif. The anions are bridged by tetrahedrally coordinated and occupationally disordered M2+ (M = Zn/Cd, Zn/Mg cations via common O atoms to form [MB5O10]n3n− layers. The intralayer intersecting channels and the interlayer voids are occupied by Na+ cations to balance the charge.

  19. Origin of low sodium capacity in graphite and generally weak substrate binding of Na and Mg among alkali and alkaline earth metals.

    Science.gov (United States)

    Liu, Yuanyue; Merinov, Boris V; Goddard, William A

    2016-04-05

    It is well known that graphite has a low capacity for Na but a high capacity for other alkali metals. The growing interest in alternative cation batteries beyond Li makes it particularly important to elucidate the origin of this behavior, which is not well understood. In examining this question, we find a quite general phenomenon: among the alkali and alkaline earth metals, Na and Mg generally have the weakest chemical binding to a given substrate, compared with the other elements in the same column of the periodic table. We demonstrate this with quantum mechanics calculations for a wide range of substrate materials (not limited to C) covering a variety of structures and chemical compositions. The phenomenon arises from the competition between trends in the ionization energy and the ion-substrate coupling, down the columns of the periodic table. Consequently, the cathodic voltage for Na and Mg is expected to be lower than those for other metals in the same column. This generality provides a basis for analyzing the binding of alkali and alkaline earth metal atoms over a broad range of systems.

  20. Green thermal-assisted synthesis and characterization of novel cellulose-Mg(OH)2 nanocomposite in PEG/NaOH solvent.

    Science.gov (United States)

    Ponomarev, Nikolai; Repo, Eveliina; Srivastava, Varsha; Sillanpää, Mika

    2017-11-15

    Synthesis of nanocomposites was performed using microcrystalline cellulose (MCC), MgCl 2 in PEG/NaOH solvent by a thermal-assisted method at different temperatures by varying time and the amount of MCC. Results of XRD, FTIR, and EDS mapping showed that the materials consisted of only cellulose (CL) and magnesium hydroxide (MH). According to FTIR and XRD, it was found that crystallinity of MH in cellulose nanocomposites is increased with temperature and heating time and decreased with increasing of cellulose amount. The PEG/NaOH solvent has a significant effect on cellulose and Mg(OH) 2 morphology. BET and BJH results demonstrated the effects of temperature and cellulose amount on the pore size corresponding to mesoporous materials. TG and DTG analyses showed the increased thermal stability of cellulose nanocomposites with increasing temperature. TEM and SEM analyses showed an even distribution of MH nanostructures with various morphology in the cellulose matrix. The cellulose presented as the polymer matrix in the nanocomposites. It was supposed the possible interaction between cellulose and Mg(OH) 2 . The novel synthesis method used in this study is feasible, cost-efficient and environmentally friendly. Copyright © 2017 Elsevier Ltd. All rights reserved.

  1. Effect of charge compensator ions (R+ = Li+, Na+ and K+) on Sr2MgSi2O7:Dy3+ phosphors by solid-state reaction method

    International Nuclear Information System (INIS)

    Sahu, Ishwar Prasad

    2016-01-01

    The Sr 2 MgSi 2 O 7 :Dy 3+ and Sr 2 MgSi 2 O 7 :Dy 3+ , R + (R + = Li + , Na + and K + ) phosphors were prepared by solid-state reaction method. The crystal structures of sintered phosphors were an akermanite-type structure which belongs to the tetragonal crystallography. The prepared phosphors were excited at 350 nm, and their corresponding emission spectrum were recorded at blue (482 nm) and yellow (575 nm) region due to the 4 F 9/2 → 6 H 15/2 and 4 F 9/2 → 6 H 13/2 transitions, respectively, of Dy 3+ ions. Commission Internationale de L'Eclairage coordinates have been calculated for each sample and its value exhibited that overall emission is near white light. The possible mechanisms of discussed white light emitting phosphors were also investigated. In order to investigate the suitability of the samples as white color light sources for industrial uses, color purity, correlated color temperature (CCT) and color rendering index (CRI) were calculated. Values of color purity, CCT and CRI were found well within the defined acceptable range. With incorporating (R + = Li + , Na + and K + ) as charge compensator ions, the emission intensity of Sr 2 MgSi 2 O 7 :Dy 3+ can be obviously enhanced. The results indicate that prepared phosphors may be a potential application in display devices. (orig.)

  2. Effect of charge compensator ions (R+ = Li+, Na+ and K+) on Sr2MgSi2O7:Dy3+ phosphors by solid-state reaction method

    Science.gov (United States)

    Sahu, Ishwar Prasad

    2016-09-01

    The Sr2MgSi2O7:Dy3+ and Sr2MgSi2O7:Dy3+, R+ (R+ = Li+, Na+ and K+) phosphors were prepared by solid-state reaction method. The crystal structures of sintered phosphors were an akermanite-type structure which belongs to the tetragonal crystallography. The prepared phosphors were excited at 350 nm, and their corresponding emission spectrum were recorded at blue (482 nm) and yellow (575 nm) region due to the 4F9/2 → 6H15/2 and 4F9/2 → 6H13/2 transitions, respectively, of Dy3+ ions. Commission Internationale de L'Eclairage coordinates have been calculated for each sample and its value exhibited that overall emission is near white light. The possible mechanisms of discussed white light emitting phosphors were also investigated. In order to investigate the suitability of the samples as white color light sources for industrial uses, color purity, correlated color temperature (CCT) and color rendering index (CRI) were calculated. Values of color purity, CCT and CRI were found well within the defined acceptable range. With incorporating (R+ = Li+, Na+ and K+) as charge compensator ions, the emission intensity of Sr2MgSi2O7:Dy3+ can be obviously enhanced. The results indicate that prepared phosphors may be a potential application in display devices.

  3. Changes in antioxidant status, protein concentration, acetylcholinesterase, (Na+,K+)-, and Mg2+ -ATPase activities in the brain of hyper- and hypothyroid adult rats.

    Science.gov (United States)

    Carageorgiou, Haris; Pantos, Constantinos; Zarros, Apostolos; Mourouzis, Iordanis; Varonos, Dennis; Cokkinos, Dennis; Tsakiris, Stylianos

    2005-06-01

    It is a common knowledge that metabolic reactions increase in hyperthyroidism and decrease in hypothyroidism. The aim of this work was to investigate how the metabolic reactions could affect the total antioxidant status (TAS), protein concentration (PC) and the activities of acetylcholinesterase (AChE), (Na+,K+)-ATPase and Mg2+ -ATPase in the brain of hyper- and hypothyroid adult male rats. Hyperthyroidism was induced in rats by subcutaneous administration of thyroxine (25 microg/l00 g body weight) once daily for 14 days, while hypothyroidism was induced by oral administration of propylthiouracil (0.05%) for 21 days. TAS, PC, and enzyme activities were evaluated spectrophotometrically in the homogenated brain of each animal. TAS, PC, and Mg2+ -ATPase activity were found unaffected in hyperthyroidism, while AChE and Na+,K+ -ATPase activities were reduced by 25% (p activities were found to be increased (approx. 23-30%, p activity and PC were shown to be inhibited (approx. 23-30%, p activities may reflect the different metabolic effects of hyper- and hypothyroidism. Such changes of the enzyme activities may differentially modulate the brain intracellular Mg2+, neural excitability, as well as the uptake and release of biogenic amines.

  4. 26Al(n,p)26Mg and 26Al(n,α)23Na cross sections from thermal energy to approximately 50 keV

    International Nuclear Information System (INIS)

    Koehler, P.E.; Gledenov, Yu.M.; Popov, Yu.P.

    1993-01-01

    Understanding the origin of 26 Al is important because it is one of the very few radioactive products of stellar nucleosynthesis to be observed directly by γ-ray telescopes. 26 Al has also been observed indirectly as a 26 Mg anomaly in some meterorites. The 26 Al(n,p) 26 Mg and 26 Al(n,α) 23 Na reactions are thought to be the major means for the destruction of 26 Al in some astrophysical environments, so a knowledge of the cross sections for these reactions is important for a better understanding of the origin of 26 Al. The authors have measured the 26 Al(n,p 1 ) 26 Mg and 26 Al(n,α 0 ) 23 Na cross sections from thermal energy to approximately 50 keV. Most of this energy range has not been explored by previous measurements. The measurements were made at the white neutron source of the Manuel Lujan, Jr. Neutron Scattering Center (LANSCE) using a ΔE-E solid-state detector telescope. Several resonances were observed. This data will be compared to previous measurements and the effect of the new data on the calculated nucleosynthesis of 26 Al will be discussed

  5. Práticas musicais como elemento de cultura, civilização e progresso na cidade de Uberlândia-MG (1888-1957)

    OpenAIRE

    Daniela Carrijo Franco Cunha; Lilia Neves Gonçalves

    2016-01-01

    O presente artigo apresenta uma discussão sobre a música como elemento de cultura, civilização e progresso na cidade de Uberlândia-MG, no período de 1888 a 1957. São abordadas práticas musicais estabelecidas nesse período, como aprender música, tocar um instrumento (como o piano), ouvir música nas praças, nos recitais realizados nos salões locais, nos cinemas, rádios. Práticas que são analisadas à luz dos processos de civilização discutidos por Elias (1994) e de distinção social na perspectiv...

  6. Na, K, Ca, Mg, and U-series in fossil bone and the proposal of a radial diffusion–adsorption model of uranium uptake

    International Nuclear Information System (INIS)

    Cid, A.S.; Anjos, R.M.; Zamboni, C.B.; Cardoso, R.; Muniz, M.; Corona, A.; Valladares, D.L.

    2014-01-01

    Fossil bones are often the only materials available for chronological reconstruction of important archeological sites. However, since bone is an open system for uranium, it cannot be dated directly and therefore it is necessary to develop models for the U uptake. Hence, a radial diffusion–adsorption (RDA) model is described. Unlike the classic diffusion–adsorption (D–A) model, RDA uses a cylindrical geometry to describe the U uptake in fossil bones. The model was applied across a transverse section of a tibia of an extinct megamammal Macrauchenia patachonica from the La Paz Local Fauna, Montevideo State, Uruguay. Measurements of spatial distribution of Na, K, Ca, and Mg were also performed by neutron activation analysis (NAA). Gamma-ray spectrometric U-series dating was applied to determine the age of the bone sample. From U concentration profile, it was possible to observe the occurrence of a relatively slow and continuous uranium uptake under constant conditions that had not yet reached equilibrium, since the uranium distribution is a ∪-shaped closed-system. Predictions of the RDA model were obtained for a specific geochemical scenario, indicating that the effective diffusion coefficient D/R in this fossil bone is (2.4 ± 0.6)10 −12 cm 2 s −1 . Mean values of Na, K, Ca, and Mg contents along the radial line of the fossil tibia are consistent with the expected behavior for spatial distributions of these mineral elements across a modern bone section. This result indicates that the fossil tibia may have its mineral structure preserved. - Highlights: • The Radial diffusion–adsorption (RDA) model is described. • RDA uses a cylindrical geometry to describe the U uptake in fossil bones. • We show new data for an extinct Macrauchenia patachonica from Uruguay. • Spatial distributions of Na, K, Ca, Mg, and U across a fossil bone section. • Gamma-ray spectrometric U-series dating was applied to determine its age

  7. Changes in acetylcholinesterase, Na+,K+-ATPase, and Mg2+-ATPase activities in the frontal cortex and the hippocampus of hyper- and hypothyroid adult rats.

    Science.gov (United States)

    Carageorgiou, Haris; Pantos, Constantinos; Zarros, Apostolos; Stolakis, Vasileios; Mourouzis, Iordanis; Cokkinos, Dennis; Tsakiris, Stylianos

    2007-08-01

    The thyroid hormones (THs) are crucial determinants of normal development and metabolism, especially in the central nervous system. The metabolic rate is known to increase in hyperthyroidism and decrease in hypothyroidism. The aim of this work was to investigate how changes in metabolism induced by THs could affect the activities of acetylcholinesterase (AChE), (Na+,K+)- and Mg2+-adenosinetriphosphatase (ATPase) in the frontal cortex and the hippocampus of adult rats. Hyperthyroidism was induced by subcutaneous administration of thyroxine (25 microg/100 g body weight) once daily for 14 days, and hypothyroidism was induced by oral administration of propylthiouracil (0.05%) for 21 days. All enzyme activities were evaluated spectrophotometrically in the homogenated brain regions of 10 three-animal pools. A region-specific behavior was observed concerning the examined enzyme activities in hyper- and hypothyroidism. In hyperthyroidism, AChE activity was significantly increased only in the hippocampus (+22%), whereas Na+,K+-ATPase activity was significantly decreased in the hyperthyroid rat hippocampus (-47%) and remained unchanged in the frontal cortex. In hypothyroidism, AChE activity was significantly decreased in the frontal cortex (-23%) and increased in the hippocampus (+21%). Na+,K+-ATPase activity was significantly decreased in both the frontal cortex (-35%) and the hippocampus (-43%) of hypothyroid rats. Mg2+-ATPase remained unchanged in the regions of both hyper- and hypothyroid rat brains. Our data revealed that THs affect the examined adult rat brain parameters in a region- and state-specific way. The TH-reduced Na+,K+-ATPase activity may increase the synaptic acetylcholine release and, thus, modulate AChE activity. Moreover, the above TH-induced changes may affect the monoamine neurotransmitter systems in the examined brain regions.

  8. The existence and stability of the anions matching the MFk+2- formula (M = Li, Na, K, Be, Mg, Ca, B, Al, Ga)

    Science.gov (United States)

    Marchaj, Marzena; Freza, Sylwia; Skurski, Piotr

    2013-02-01

    The electronic stabilities of the MFk+2- anions (where M = Li, Na, K, Be, Mg, Ca, B, Al, Ga; and k is the maximal formal valence of atom M) were investigated at the OVGF/6-311 + G(3df) level. The vertical electron detachment energies (VDE) of the anions examined were found to be large (7.1-10.1 eV) albeit not significantly exceeding those for the corresponding MFk+1- superhalogen anions. Even though all the MFk+2- species studied were predicted to be both geometrically and electronically stable, some of them turned out to be thermodynamically unstable (i.e., susceptible to the F atom loss).

  9. Calculation of vibrational spectra of complex hydrides, LiBeH/sub 3/, NaBeH/sub 3/ and LiMgH/sub 3/

    Energy Technology Data Exchange (ETDEWEB)

    Sukhanov, L P; Boldyrev, A I [AN SSSR, Chernogolovka. Inst. Novykh Khimicheskikh Problem

    1984-03-01

    The non-empirical Hartree-Fock-Ruthan method with a two-exponent Ros-Zigban basis has been used to calculate the coefficients of harmonic force field, frequency and intensity of normal vibrations of the LiBeH/sub 3/, NaBeH/sub 3/ and LiMgH/sub 3/ complex hydrides. Attribution of vibrational types is conducted. Isotope shifts for different isotope substitutions in the L(MH/sub 3/) are calculated. The effect of the nature of both the outer-spherical cation L/sup +/ and central atom M on the vibrational spectrum is discussed.

  10. Transitions in Al-like, Mg-like and Na-like Kr and Mo, observed in the JET tokamak

    Energy Technology Data Exchange (ETDEWEB)

    Jupen, C; Denne, B; Martinson, I [JET Joint Undertaking, Abingdon, Oxon (UK)

    1990-05-01

    Spectra of highly ionized Kr and Mo, emitted from the JET tokamak plasmas, have been recorded in the region 30-335 A. Detailed analysis of the n=3, {Delta}n=0 transitions in Kr XXIV-XXVI and Mo XXX-XXXII has resulted in a number of new spectral classifications. Some isoelectronic regularities for Al-like and Mg-like ions are discussed. (orig.).

  11. Virtual excitation of the GDR mode in the subbarrier /sup 23/Na(p,. gamma. )/sup 24/Mg reaction

    Energy Technology Data Exchange (ETDEWEB)

    Kicinska-Habior, M; Dabrowska, M; Decowski, P; Matulewicz, T; Sikora, B; Toke, J; Cseh, J; Somorjai, E

    1984-10-01

    Differential cross sections for nonresonant radiative capture of low energy protons (Esub(p)=1,348 keV and 1,370 keV) by /sup 23/Na nuclei exhibit features pointing to the virtual excitation of the giant dipole resonance (GDR) mode. Theoretical analysis carried out within the framework of the direct - semidirect capture model reveals an enhanced coupling of the GDR with the incident proton f-wave consistent with the microscopic structure of the GDR in the s-d shell nuclei.

  12. "Ne kreshtshenogo, ne otpetogo..." : [luuletused] / Marina Petrova

    Index Scriptorium Estoniae

    Petrova, Marina

    2001-01-01

    Sisu: "Ne kreshtshenogo, ne otpetogo..." ; "Inogo mesta vstretshi v mire net..." ; "Moi put lezhit tsherez Moskvu..." ; "Osvoboditelnaja ossen - ..." ; Pjuhtitskim aistam ; "Vesjolõje svetshi kanona..." ; Vjuga ; Materi Bozhijei Pjuhtitskoi ; "Pustõnja moja, pustõnja..." ; "Odinnadtsat let v mojo serdtse gljadjat kupola..."

  13. Plantar, pastorar e fiar na Vila Formosa de Alfenas, MG: décadas de 1850-1890

    Directory of Open Access Journals (Sweden)

    Marcos Lobato Martins

    2013-06-01

    Full Text Available A região do Sul de Minas, hoje conhecida como a principal área cafeeira do país, era, no decurso do século XIX, zona destacada de agricultura de abastecimento. A criação de gado e a produção de mantimentos eram as principais atividades econômicas regionais. A cafeicultura, introduzida em meados do século XIX, promoveu gradual modificação do cenário regional. Porém, esta transição para a agricultura de exportação, que ocorreu na virada para o século XX, ainda é pouco conhecida, especialmente no que se refere às alterações nos sistemas agrários e na composição das fortunas dos proprietários. A análise desse processo no antigo município de Alfenas é o objetivo deste artigo. As fontes utilizadas são inventários e documentos cartorários.

  14. Dielectronic satellites to the Ne-like yttrium resonance lines

    Energy Technology Data Exchange (ETDEWEB)

    Osterheld, A.L. [Lawrence Livermore National Lab., CA (United States); Nilsen, J. [Lawrence Livermore National Lab., CA (United States); Khakhalin, S.Ya. [MISDC, VNIIFTRI, Mendeleevo (Russian Federation); Faenov, A.Ya. [MISDC, VNIIFTRI, Mendeleevo (Russian Federation); Pikuz, S.A. [Rossijskaya Akademiya Nauk, Moscow (Russian Federation). Fizicheskij Inst.

    1996-09-01

    We present a detailed analysis of the spectrum of satellite transitions to the n=2-3 and n=2-4 Ne-like yttrium resonance lines. Satellite lines from the double excited 2s{sup 2}2p{sup 5}3l3l`, 2s{sup 2}2p{sup 5}3l4l`, 2s2p{sup 6}3l3l` and 2s2p{sup 6}3l4l` levels of Na-like Y as well as from 2s{sup 2}2p{sup 5}3l3l`3l{sup ``} and 2s2p{sup 6}3l3l`3l{sup ``} levels of Mg-like Y were observed in spectra from a laser-produced plasma. The X-ray spectra were recorded with high spectral resolution {lambda}/{Delta}{lambda}{approx}3500-5000 in the wavelength region of the n=2-3 Ne-like resonance lines and with {lambda}/{Delta}{lambda}>1000 in the region of the n=2-4 Ne-like resonance lines. A total of more than 50 spectral features were identified, and their wavelengths were measured. A simple intensity model was developed, which agreed well with the measured spectra and assisted the line identification. The consistency of the model for different spectral regions demonstrates the potential of the Na-like and Mg-like satellite lines for diagnosing plasma conditions. (orig.).

  15. Adsorption of acetanilide herbicides on soil and its components. II. Adsorption and catalytic hydrolysis of diethatyl-ethyl on saturated Na(+)-, K(+)-, Ca(2+)-, and Mg(2+)-montmorillonite.

    Science.gov (United States)

    Liu, W P; Fang, Z; Liu, H J; Yang, W C

    2001-04-01

    Adsorption and catalytic hydrolysis of the herbicide diethatyl-ethyl [N-chloroacetyl-N-(2,6-diethylphenyl)glycine ethyl ester] on homoionic Na(+)-, K(+)-, Ca(2+)-, and Mg(2+)-montmorillonite clays were investigated in water solution. The Freundlich adsorption coefficient, Ki, got from isotherms on clay followed the order of Na+ approximately K+ > Mg2+ approximately Ca2+. Analysis of FT-IR spectra of diethatyl-ethyl adsorbed on clay suggests probable bonding at the carboxyl and amide carbonyl groups of the herbicide. The rate of herbicide hydrolysis in homoionic clay suspensions followed the same order as that for adsorption, indicating that adsorption may have preceded and thus caused hydrolysis. Preliminary product identification showed that hydrolysis occurred via nucleophilic substitution at the carboxyl carbon, causing the cleavage of the ester bond and formation of diethatyl and its dechlorinated derivative, and at the amide carbon, yielding an ethyl ester derivative and its acid. These pathways also suggest that hydrolysis of diethatyl-ethyl was catalyzed by adsorption on the clay surface.

  16. Quantitative analysis of sodium di-uranate for Al, Ca, Fe, Mg, Mn, Na by flame-atomic absorption spectrometric method

    International Nuclear Information System (INIS)

    Jat, J.R.; Balaji Rao, Y.; Subba Rao, Y.

    2015-01-01

    Nuclear Fuel Complex (NFC) receives Sodium Di-Uranate (SDU) from Uranium Corporation of India Limited (UCIL) for producing sinterable UO 2 pellets for manufacturing fuel sub assemblies. Several impurities present in ore find their way into SDU during its conversion. Stringent specification have been laid down by the reactor designs for achieving the optimum performance of the fuel and several impurity element like Al, Ca, Fe, Mg, Mn, Na among others affects severely performance of UO 2 fuel. Most of the impurity including the above mentioned elements are generally analysed by ICP-OES method. However, determination of Al, Ca, Fe, Mg, Mn and Na by ICP-OES requires lot of dilution as they are present at high levels in SDU. Apart from introducing dilution error, dilution process is very tedious and time consuming work and not a preferred choice in an industrial lab like control lab where large analytical load exists and time bound analysis is a requirement. To avoid these difficulties a simple and reliable Flame Atomic absorption spectrometric technique has been developed for regular analysis. Present method involves dissolution of SDU sample in Conc. HNO 3 and after the complete dissolution the sample solution has been evaporated to near dryness on a hot plate. Subsequently sample solution has been brought into 4N HNO 3 medium

  17. Efecto de diferentes niveles de proteína de la dieta sobre el crecimiento de juveniles del pez neón Paracheirodon innesi (pisces:characidae

    Directory of Open Access Journals (Sweden)

    Jorge Luna-Figueroa

    2016-03-01

    Full Text Available Se evaluó el efecto de alimentos con diferente concentración de proteína (53,5%, 50,0%, 41,6% y 30,0% sobre las tasas de crecimiento absoluto (TCA, relativo (TCR y específico (TCE de juveniles de P. innesi. El incremento en peso y en longitud total, así como las tasas de crecimiento fueron mayores en los peces alimentados con la dieta I (53,5% proteína y decrecieron conforme disminuyó la concentración de proteínas en el alimento (P<0,05. Las diferencias porcentuales promedio referentes al peso fueron 65,15% TCA, 63,69% TCR y 45,85% TEC, mientras que para la longitud total fueron 57,41% TCA, 59,00% TCR y 52,25% TCE mayores (P<0,05 en los peces alimentados con la dieta I respecto de la II, III y IV. Finalmente, los resultados de la presente investigación indican que el nivel de proteína de la dieta que produce máximo crecimiento en P. innesi es 53,5%.

  18. Proton capture in the nuclei 21Ne and 22Ne and its influence on the solar hydrogen burning in the neon-sodium cyclus

    International Nuclear Information System (INIS)

    Goerres, J.

    1983-01-01

    The aim of this thesis was to remove the uncertainties in the reaction rates of 21 Ne(p,γ) 22 Na and 22 Ne(p,γ) 23 Na in order to can make founded statements about the hydrogen burning in the NeNa cyclus. After the description of the experimental arrangement the search for resonances in the reaction 21 Ne(p,γ) 22 Na below Esub(p)=355 keV is reported. While the theory of the direct radiation capture is discussed the experimental results of the search for this transitions in 21 Ne(p,γ) 22 Na respectively 22 Ne(p,γ) 23 Na are presented. The astrophysical aspects of the results of this thesis are discussed and summarizingly presented. (orig./HSI) [de

  19. Accumulation of 90Sr, Ca, Mg, K and Na in crane's-bill plants cultavated on soil and hydroponics

    International Nuclear Information System (INIS)

    Analyan, V.L.; Sarkisyan, G.A.

    1981-01-01

    Accumulation of 90 Sr in plants under the conditions of soil and hydroponic cultures from the viewpoint of the possibility of obtaining ''pure'' vegetable production has been studied. Predominant absorption of 90 Sr by soil plants as compared with calcium is shown. In the course of using the hydroponic cultivation method redominant radiostrontium absorption has been manifested to all investigated nuclides including potassium. The accumulation coefficients analysis has shown that among soil plants the fisarst place is occupied by potassium, while the 90 Sr coefficients are greater than Ca on hydroponics, where the true, not distorted by soil sorption processes absorptive plant capacity has been manifested, the first places in the series are occupied by 90 Sr and K, then come Ca and Mg

  20. Accumulation of /sup 90/Sr, Ca, Mg, K and Na in crane's-bill plants cultivated on soil and hydroponics

    Energy Technology Data Exchange (ETDEWEB)

    Analyan, V L; Sarkisyan, G A [AN Armyanskoj SSR, Erevan. Inst. Agrokhimicheskikh Problem i Gidroponiki

    1981-01-01

    Accumulation of /sup 90/Sr in plants under the conditions of soil and hydroponic cultures from the viewpoint of the possibility of obtaining ''pure'' vegetable production has been studied. Predominant absorption of /sup 90/Sr by soil plants as compared with calcium is shown. In the course of using the hydroponic cultivation method predominant radiostrontium absorption has been manifested to all investigated nuclides including potassium. The accumulation coefficients analysis has shown that among soil plants the first place is occupied by potassium, while the /sup 90/Sr coefficients are greater than Ca on hydroponics, where the true, not distorted by soil sorption processes absorptive plant capacity has been manifested, the first places in the series are occupied by /sup 90/Sr and K, then come Ca and Mg.

  1. K-shell Photoionization of Na-like to Cl-like Ions of Mg, Si, S, Ar, and Ca

    Science.gov (United States)

    Witthoeft, M. C.; Garcia, J.; Kallman, T. R.; Bautista, M. A.; Mendoza, C.; Palmeri, P.; Quinet, P.

    2010-01-01

    We present R-matrix calculations of photoabsorption and photoionization cross sections across the K edge of Mg, Si, S, Ar, and Ca ions with more than 10 electrons. The calculations include the effects of radiative and Auger damping by means of an optical potential. The wave functions are constructed from single-electron. orbital bases obtained using a Thomas-Fermi-Dirac statistical model potential. Configuration interaction is considered among all states up to n = 3. The damping processes affect the resonances converging to the K-thresholds causing them to display symmetric profiles of constant width that smear the otherwise sharp edge at the photoionization threshold. These data are important for the modeling of features found in photoionized plasmas.

  2. EFEITOS E PROCESSOS DE (DESTERRITORIALIZAÇÃO NA IMPLANTAÇÃO DA UHE DE AIMORÉS (MG

    Directory of Open Access Journals (Sweden)

    Rene Gonçalves Serafim Silva

    2012-06-01

    Full Text Available O presente artigo objetiva elucidar os efeitos e processos de desterritorialização que ocorreram com a implantação da usina hidrelétrica de Aimorés na bacia do Rio Doce, em Minas Gerais. Em um primeiro momento é feita toda a discussão teórica que embasa esta pesquisa, e em seguida abordam-se as transformações socioespaciais que incidiram sobre os municípios atingidos com base nas informações divulgadas pelo Movimento dos Atingidos por Barragens (MAB, além de relatos de moradores deslocados compulsoriamente pelo empreendimento para outras áreas. O procedimento metodológico adotado foi o levantamento teórico de autores que trabalham tanto com a temática dos Grandes Projetos de Investimento quanto os conceitos e abordagens de território e desterritorialização, para compreender a relação intrínseca que estes possuem. Foram analisadas, também, as notícias divulgadas pelo MAB em ordem cronológica de acontecimentos, para compreender a luta dos atingidos por melhores condições de reassentamento. Posteriormente, focou-se na análise do empreendimento hidrelétrico, seu histórico de concessão até o momento atual, tendo sido realizado um breve histórico da constituição da usina. Por fim, foram apontadas observações importantes acerca dos processos de desterritorialização que ocorreram com os moradores da região, principalmente dos três municípios atingidos, desterritorialização esta que ultrapassa a questão tão somente físico-territorial, chegando aos territórios simbólico-afetivos que permeiam a sociedade.

  3. Mapeamento preliminar de solos com horizonte B textural e B nítico na região de Lavras, MG Preliminary mapping of alfisols and ultisols in the region of Lavras, MG

    Directory of Open Access Journals (Sweden)

    Marilusa Pinto Coelho Lacerda

    2009-06-01

    Full Text Available Estudos de caracterização de solos e estabelecimento de relações entre pedologia, geologia e geomorfologia permitem a elaboração de modelos preditivos da distribuição dos solos na paisagem. Objetivou-se, com o presente trabalho, estudar estas relações, com a finalidade de representar a distribuição de solos com horizonte B textural e B nítico na paisagem da região de Lavras, MG, por intermédio da geração de mapa preliminar de solos, utilizando técnicas de geoprocessamento. Os estudos foram realizados em solos com horizonte B textural e B nítico, uma vez que esses solos apresentam características relacionadas à variação da composição geoquímica das rochas ígneas de origem, refletindo-se em vários atributos dos solos, enfatizando a cor e o teor de Fe2O3. Foram realizadas campanhas de campo com avaliações morfológicas, físicas e químicas de perfis de solos representativos, desenvolvidos a partir de unidades geológicas de composições geoquímicas distintas, estabelecendo as relações pedogeológicas. Verificou-se, também, a distribuição dos solos na paisagem, com o estabelecimento das relações pedogeomorfológicas. Foi constatado que tais solos são desenvolvidos na região em relevo caracterizado por classes de declividade de 12 a 45%, originando diferentes classes de solos com horizonte B textural e B nítico, diretamente relacionados à variação do material de origem. Os critérios estabelecidos nas relações entre pedologia, geologia e geomorfologia permitiram avaliar a distribuição dos solos na paisagem estudada e a geração do mapa preliminar de solos, com individualização de solos com horizonte B textural e B nítico.Studies of characterization of soils and establishment of relationships among pedology, geology and geomorphology allow the elaboration of models of soil distribution in landscaping. This study aimed at studies of this nature, with the purpose of representing the distribution of

  4. Modelagem da qualidade da água na bacia hidrográfica do Rio Piracicaba (MG

    Directory of Open Access Journals (Sweden)

    Maytê Maria Abreu Pires de Melo Silva

    Full Text Available RESUMO Este trabalho tem como objetivo aplicar um modelo de qualidade da água, o Sistema de Apoio à Decisão/Instituto de Pesquisas Hidráulicas (SAD-IPH, na bacia hidrográfica do Rio Piracicaba. Os parâmetros de qualidade modelados foram a demanda bioquímica de oxigênio (DBO, oxigênio dissolvido (OD, fósforo total, nitrogênio e coliformes termotolerantes. Os dados de vazão foram obtidos através da aplicação do modelo hidrológico Modelo de Grandes Bacias/IPH (MGB-IPH. O modelo de qualidade foi calibrado utilizando dados dos postos de monitoramento da qualidade da água do Instituto Mineiro de Gestão das Águas (IGAM. As curvas de DBO, OD e fósforo total apresentaram boa aderência aos dados das campanhas de monitoramento. Os parâmetros nitrogênio (orgânico, amoniacal, nitrito, nitrato e coliformes termotolerantes foram subestimados pelo modelo. A maioria dos cursos d’água apresentam a qualidade de suas águas compatíveis com a classe 4 de enquadramento, entretanto as concentrações poluentes atuais estão acima do esperado para a referida bacia, já que o seu enquadramento atual é classe 2.

  5. Electrochemical Behavior Assessment of As-Cast Mg-Y-RE-Zr Alloy in Phosphate Buffer Solutions (X Na3PO4 + Y Na2HPO4) Using Electrochemical Impedance Spectroscopy and Mott-Schottky Techniques

    Science.gov (United States)

    Fattah-alhosseini, Arash; Asgari, Hamed

    2018-05-01

    In the present study, electrochemical behavior of as-cast Mg-Y-RE-Zr alloy (RE: rare-earth alloying elements) was investigated using electrochemical tests in phosphate buffer solutions (X Na3PO4 + Y Na2HPO4). X-ray diffraction techniques and Scanning electron microscopy equipped with energy dispersive x-ray spectroscopy were used to investigate the microstructure and phases of the experimental alloy. Different electrochemical tests such as potentiodynamic polarization (PDP), electrochemical impedance spectroscopy (EIS) and Mott-Schottky (M-S) analysis were carried out in order to study the electrochemical behavior of the experimental alloy in phosphate buffer solutions. The PDP curves and EIS measurements indicated that the passive behavior of the as-cast Mg-Y-RE-Zr alloy in phosphate buffer solutions was weakened by an increase in the pH, which is related to formation of an imperfect and less protective passive layer on the alloy surface. The presence of the insoluble zirconium particles along with high number of intermetallic phases of RE elements mainly Mg24Y5 in the magnesium matrix can deteriorate the corrosion performance of the alloy by disrupting the protective passive layer that is formed at pH values over 11. These insoluble zirconium particles embedded in the matrix can detrimentally influence the passivation. The M-S analysis revealed that the formed passive layers on Mg-Y-RE-Zr alloy behaved as an n-type semiconductor. An increase in donor concentration accompanying solutions of higher alkalinity is thought to result in the formation of a less resistive passive layer.

  6. Continuidade espacial da condutividade hidráulica saturada do solo na bacia hidrográfica do Alto Rio Grande, MG

    Directory of Open Access Journals (Sweden)

    Camila Cristina Alvarenga

    2011-10-01

    Full Text Available A distribuição espacial da condutividade hidráulica saturada (k0 é essencial para estudos relacionados a erosão do solo e escoamento superficial. Este trabalho objetivou estudar a continuidade espacial do atributo hidrológico do solo k o na Bacia Hidrográfica do Alto Rio Grande, MG, e realizar seu mapeamento por meio de técnicas geoestatísticas, utilizando dados sem e com transformação logarítmica. Os modelos de semivariograma esférico e exponencial foram ajustados ao semivariograma experimental pelo método dos Mínimos Quadrados Ordinários (MQO e Mínimos Quadrados Ponderados (MQP. Técnicas de validação cruzada e preditiva foram aplicadas para a escolha do melhor modelo. Os resultados indicaram que, ao se trabalhar com o logaritmo dos dados de k o, houve redução de pontos discrepantes e de anisotropia, entretanto os valores mais elevados de grau de dependência espacial foram observados nos dados sem transformação. O ajuste do modelo esférico, por meio do método MQO, foi o que produziu melhor desempenho na modelagem da continuidade espacial de k0. Os mapas gerados a partir dos dados sem e com transformação logarítmica não apresentaram o mesmo comportamento na distribuição espacial dos valores, e o mapa dos dados na forma transformada teve o melhor detalhamento da distribuição espacial.

  7. Performance testing of personnel extremity dosimeters by Korean LiF: Mg, Cu, Na, Si TLD(KLT-300)

    International Nuclear Information System (INIS)

    Kim, J.L.; Lee, J.I.; Chang, S.Y.; Choi, H.S.; Lee, D.H.; Han, S.J.

    2005-01-01

    Full text: As the needs and opportunities for utilization of atomic energy and radiation are increasing, the related industries, medicines, environments are developing and the relevant organizations and companies are also becoming diverse. In result, the types and kinds of the radiation related to occupational environments are becoming diversified. For the whole body dosimeters, the methodology and criteria for the performance evaluation and safety regulations and laws have been prepared in some detail, but for the extremity dosimeters, those are not prepared yet in Korea. The extremity dosimeters are required when the extremity part of our body, such as hand, elbow, and arm below the elbow, the foot, knee, and leg below the knee are exposed to the radiation in specific work environments. The dosimeter irradiation conditions are clearly discriminated between the whole body exposure condition and the extremity exposure condition. By the investigation and analysis of the management status and dose evaluation methods of the extremity dosimeters for the local absorbed dose, the personnel monitoring system of the extremity dosimeter services in Korea can be diagnosed, and the performance testing criteria and procedures can be established. Therefore, this study presents the performance testing results of extremity dosimeters on the finger and arm/leg phantoms by the procedures recommended in the ANSI (American National Standard) N13.32 using KLT-300 TL materials (LiF:Mg,Cu,Nas,Si) which were developed in Korea Atomic Energy Research Institute (KAERI). The results show that the performance index for the two types of phantoms are sufficiently satisfied with the prescribed tolerance level in the all of the test categories listed in the ANSI N13.32. These results and procedures used in this study can be applicable for regulatory body to establish the standard criteria for acceptable performance and testing conditions for personnel extremity dosimeters services in the

  8. Construction of an ''intelligent'' trigger system for kaons and study of the K+ production in the system Ne+NaF at 1.0 GeV/u

    International Nuclear Information System (INIS)

    Ahner, W.

    1993-07-01

    The technical part of this thesis describes the construction, the properties, and the experience from the application of an intelligent software trigger for the experiments on the production of positive kaons at the kaon spectrometer. The software trigger was applied in several beam-times. An essiential improvement in the yield of the registrated kaons was reached. The realization ensued by the application of standard components and represents a flexible and cost-efficient solution. The physical part of this thesis deals with the measurement of the double-differential cross section for positive kaons, positive pions, and protons in the system Ne+NaF at 1.0 GeV/u beam energy in the laboratory-angle range ofΘ lab =44 ±4 . the beam energy of 1.0 GeV/u lies below the threshold energy for the production of positive kaons in the collision of two free nucleons of E beam threshold =1.58 GeV. The momentum spectra of kaons and pions in the laboratory-momentum range from 270 MeV/c to 1140 MeV/c can be well described by a Boltzmann distribution in the c. m. system. The steepness parameter of the Boltzmann distributions amount to 64 MeV for kaons and 58 MeV for pions. The momentum-integrates cross section were determined from the extrapolation of the fitted Boltzmann distributions to: (dσ/dΩ lab ) ΔΩ lab K + =58.6±9.2 μb/sr and (dσ/dΩ lab ) ΔΩ lab π + =169±17 mb/sr. The total cross sections were calculated under the assumption of the isotropy in the c. m. system from the fitted distributions: σ 0 K + =335±52 μb and σ 0 π + =939±96 mb. The mass dependence of the meson production cross sections in the symmetrc collisional system Ne+NaF was studied and compared with the results of the study of the heavy collisional system Au+Au

  9. Mild hydrothermal crystal growth of new uranium(IV) fluorides, Na3.13Mg1.43U6F30 and Na2.50Mn1.75U6F30: Structures, optical and magnetic properties

    Science.gov (United States)

    Yeon, Jeongho; Smith, Mark D.; Tapp, Joshua; Möller, Angela; zur Loye, Hans-Conrad

    2016-04-01

    Two new uranium(IV) fluorides, Na3.13Mg1.43U6F30 (1) and Na2.50Mn1.75U6F30 (2), were synthesized through an in situ mild hydrothermal route, and were structurally characterized by single crystal X-ray diffraction. The compounds exhibit complex crystal structures composed of corner- or edge-shared UF9 and MF6 (M=Mg, Mn) polyhedra, forming hexagonal channels in the three-dimensional framework, in which ordered or disordered divalent metal and sodium atoms reside. The large hexagonal voids contain the nearly regular M(II)F6 octahedra and sodium ions, whereas the small hexagonal cavities include M(II) and sodium ions on a mixed-occupied site. Magnetic susceptibility measurements yielded effective magnetic moments of 8.36 and 11.6 μB for 1 and 2, respectively, confirming the presence and oxidation states of U(IV) and Mn(II). The large negative Weiss constants indicate the spin gap between a triplet and a singlet state in the U(IV). Magnetization data as a function of applied fields revealed that 2 exhibits paramagnetic behavior due to the nonmagnetic singlet ground state of U(IV) at low temperature. UV-vis diffuse reflectance and X-ray photoelectron spectroscopy data were also analyzed.

  10. Instrumental neutron-activation analysis applications in the age dynamics assessment of Ca, Cl, K, Mg. Mn, Na, P, and Sr contents in the human cortical bone

    International Nuclear Information System (INIS)

    Zaichick, V.

    2003-01-01

    Full text: Senile osteoporosis and particularly osteoporosis among postmenopausal women represents an urgent problem of modern medicine. One of the main osteoporosis symptoms is a decrease in both bone mineral density and subsequent bone strength. The upper extremity of the femur in humans is a particularly vulnerable section of the skeleton, being subject to fracture and necrosis and to destruction of its cartilage. Iliac crest biopsies are commonly taken clinically on patients. It is known that the control of the mineral component providing bone strength is a good indicator to detect bone diseases like osteoporosis. Despite this, changes of chemical element contents occurring with age in the femoral head and the iliac crest of female and male separately have been little studied, but in iliac cortical bone have not been studied at all. The effect of age and sex on chemical element contents in intact cortical bone of femoral neck and iliac crest of 81 relatively healthy 15-55 years old women (n=36) and men (n=45) was investigated. All subjects had died suddenly and bone samples were obtained at necropsy from the right side of bodies within twenty-four hours after death. A tool made of titanium and plastic was used to clear samples from soft tissues and blood and to cut cortical part of bone. The IAEA and NIST reference materials (H-5 animal bone and SRM1486 bone meal) were used to estimate the precision and accuracy of results. Contents of Ca, Cl, K, Mg> Mn, Na, P, and Sr in intact bone samples were determined by instrumental neutron activation analysis using short-lived radionuclides. Our means data for each element of reference materials were within the certified 95 % confidence interval, and indicate an acceptable accuracy of the obtained results. No age- and sex-related differences in the cortical femoral neck composition were detected. Mean values (M±S.E.M.) of Ca, Cl, K, Mg, Mn, Na, P, and Sr mass fractions (on dry weight basis) for female and male all

  11. Caracterização de acessos de mangueira Ubá na Zona da Mata Mineira Characterization of access Uba mango of Zona da Mata, MG, Brazil

    Directory of Open Access Journals (Sweden)

    Girlaine Pereira Oliveira

    2013-06-01

    Full Text Available Objetivou-se realizar a caracterização física e química de acessos de manga Ubá na região da Zona da Mata de Minas Gerais, visando a identificar materiais de interesse industrial. Frutos fisiologicamente maduros foram colhidos e transportados para o Laboratório de Análise de Frutas da UFV, onde foram lavados, tratados com fungicida Prochloraz (Sportak 450 CE, Hoeschst Schering AgrEvo UK Ltd., Inglaterra, na dose de 49,5g100L-1 de água, por 10 minutos e secos ao ar. Em seguida, foram tratados com Ethephon, ácido 2-cloroetil fosfônico, (Ethrel 240g de ethephon.L-1, RHône-Poulenc Agro Brasil LTDA na concentração de 1g i.a.L-1 juntamente com espalhante adesivo Adesil (760g i L-1, Nufarm Indústria Química e Farmacêutica S.A. na concentração de 20mL 100L-1 durante 5 minutos e secos ao ar. Em seguida, foram armazenados a 20±1°C e umidade relativa de 90% e avaliados após o completo amadurecimento. Os frutos que apresentaram melhores características para o processamento industrial foram os provenientes dos acessos 7, 11, 16, 17, 21, 26, 28, 47, 48, 53, 54 e 56. A massa de fruto, firmeza, teor de sólidos solúveis e teor de ácido ascórbico são as características que apresentaram maior variabilidade dos acessos de mangueira Ubá. A variabilidade genética existente nas mangueiras Ubá, em Visconde do Rio Branco propicia disponibilizar materiais para futuros trabalhos de melhoramento genético e implantação de banco de germoplasma.The objective of this paper was to carry out the physical and chemical characterization of mango Uba access in the Zona da Mata of Minas Gerais, to identify materials of industrial interest. Physiologically mature fruits were harvested and transported to the Laboratory of Analysis of Fruit of the UFV, where they were washed, treated with fungicide Prochloraz (Sportak 450 EC, Hoechst Schering AgrEvo UK Ltd., England at a dose of 49.5g 100L-1 water, for 10 minutes and air dried. After that, they were

  12. Interface role in the enhanced photocatalytic activity of TiO2-Na0.9Mg0.45Ti3.55O8 nanoheterojunction

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    Ze-Qing Guo

    2017-02-01

    Full Text Available TiO2-Na0.9Mg0.45Ti3.55O8 (TiO2-NMTO nanocomposites were synthesized via a simple hydrothermal method. TiO2 nanoparticles were loaded on NMTO nanosheets with well matched lattices. The TiO2-NMTO nanoheterojunctions enjoyed high photodegradative ability for a RhB pollutant. The photoinduced electron-hole pairs were separated effectively by the TiO2-NMTO nanoheterojunctions, which were directly observed by surface potential measurements with a scanning Kelvin probe microscopy. The photogenerated electrons accumulate at interface due to the high density of interface states, and holes remain TiO2 and NMTO particles, other than they migrate from one part to another in heterojunctions by comparing the surface potentials under illumination with different wavelengths.

  13. Gamma ray measurements in the reactions 23Na(p,γ)24Mg and 31P(p,γ)32S

    International Nuclear Information System (INIS)

    Boydell, S.G.

    1974-01-01

    Accurate branching ratio values for twenty-two resonances in the reaction 23 Na(p,γ) 24 Mg and twenty-five resonances in the reaction 31 P(p,γ) 32 S have been measured with Ge(Li) spectrometers. The values were necessary for the accurate analysis of work of astrophysical interest, and also used for the assignment of possible Jsupπ values to nuclear levels. The two spectrometers used were calibrated for relative peak efficiency independently of previous Ge(Li) work; the calibrations were accurate to 6% and 10%. Extensive calculations were made of the finite solid angle effects of the detector on anisotropic gamma rays; the calculations were valid for geometries where the source did not lie on the detector axis. Work was carried out at the Australian Atomic Energy Commission; this was made possible by the assistance of the Australian Institute of Nuclear Science and Engineering. (author)

  14. Superhalogen properties of hetero-binuclear anions MM‧F4- and MM″F5- (M = Li, Na, M‧ = Be, Mg, Ca; M″ = B, Al, Ga)

    Science.gov (United States)

    Yang, Hui; Li, Ying; He, Hui-Min; Tong, Jing; Wu, Di; Li, Zhi-Ru

    2017-09-01

    Hetero-binuclear superhalogen anions, namely MM‧F4- and MM″F5- (M = Li, Na; M‧ = Be, Mg, Ca; M″ = B, Al, Ga), have been theoretically characterized at the MP2(FULL)/6-311+G(3df) level. It is found that two central atoms can be linked by at most three fluorine ligands. The large vertical electron detachment energies (VDEs, 7.449-8.978 eV) verify the superhalogen identity of these anions. The VDEs of both MM‧F4- and MM″F5- decrease when the atomic size of M increases whereas increase with the size of M‧ and M″. Besides, the extra electron distribution also has effect on the VDEs of such superhalogen anions.

  15. Das sobras à indústria da reciclagem: a invenção do lixo na cidade - Uberlândia-MG 1980-2002

    OpenAIRE

    Couto, Ana Mágna Silva

    2006-01-01

    Esta pesquisa buscou problematizar as relações vividas em torno do lixo, na cidade de Uberlândia-MG, ao longo dos anos de 1980 a 2002. A questão do lixo constitui assunto vasto e complexo. Como problemática do espaço e do viver urbanos, o lixo pode ser apreendido, entre outras coisas, como empreendimento/negócio, trabalho/sobrevivência e, também, no que se refere ao governo municipal, problema da administração pública e da política. Propusemo-nos a lidar com o lixo como objeto de análise ...

  16. Perdas na comercialização de quatro hortaliças tuberosas em supermercados de Guanhães/MG

    OpenAIRE

    Castro, Eloísia Maria Canuto de

    2013-01-01

    O objetivo deste trabalho foi analisar as perdas pós-colheita de quatro raízes tuberosas: batata-baroa, batata-doce, beterraba e cenoura, ocorridas no processo de comercialização em dois supermercados (A e B), na cidade de Guanhães/MG. Os supermercados tinham a mesma capacidade, porém o supermercado B estocava as hortaliças em câmara frigorífica e a exposição nas gôndolas era parcelada de acordo com as vendas. Para obtenção dos dados, fez-se acompanhamento das atividades desenvolvidas pelo at...

  17. Brain regional distributions of the minor and trace elements, Na, Mg, Cl, K, Mn, Zn, Rb and Br, in young and aged mice

    International Nuclear Information System (INIS)

    Amano, R.; Oishi, S.; Ishie, M.; Kimura, M.

    2001-01-01

    Brain regional cerebral concentrations of minor and trace elements, Na, Mg, Cl, K, Mn, Zn, Rb and Br were determined in young and aged mice, by instrumental neutron activation analysis for small amounts of regional (corpus striatum, cerebellum, cerebral cortex, hippocampus, midbrain, pons and medulla olfactory bulb) samples. Significant age-related differences were found for Mn concentration in all brain regions: The Mn concentration of the young brain was higher than those of aged brain, in addition, Zn was distributed heterogeneously, and highly concentrated in cerebral cortex and hippocampus regions in both young and aged mice. These results suggest that, in the aged brain, Mn is required less than in the young brain, on the other hand, Zn is required equally in both young and aged brains. (author)

  18. Accurate atom-solid kinetic energy shifts from the simultaneous measurement of the KLL Auger spectra for Na, Mg, Al and Si

    International Nuclear Information System (INIS)

    Aksela, S; Turunen, P; Kantia, T; Aksela, H

    2011-01-01

    KLL Auger-energy shifts between free atoms and their solid surfaces were determined from spectra measured simultaneously in identical experimental conditions. Essentially, the shift values obtained for Na, Mg, Al and Si were more accurate than those achieved by combining the results from separate vapour and solid measurements. Using atomic Auger energies and determined shifts, reliable absolute solid state Auger energies with respect to the vacuum level were also obtained. Experimental shift values were also compared with calculations obtained with the excited atom model. 2s and 2p binding energy shifts were estimated from recent high resolution and due to open shell strongly split vapour phase spectra and corresponding published solid state results. Also, the question of the extent to which the 2s and 2p shifts deviate has been discussed here. (paper)

  19. Distribuição de espécies de columbídeos (Aves: Coliumbiformes), na zona urbana de Uberlândia, MG

    OpenAIRE

    Cândido, Claudiney Rocha

    2006-01-01

    Dentre as aves que vivem no ambiente urbano, podemos destacar os columbídeos (pombas e rolinhas). Em função da sua capacidade de adaptação, várias espécies desse grupo se tornaram tolerantes à presença e transformações humanas. Os objetivos desse estudo foram: determinar a distribuição de espécies de columbídeos na zona urbana de Uberlândia, MG e correlacionar a ocorrência dessas espécies com fatores ambientais (cobertura vegetal, tipos de edificações e distância em relação ao ...

  20. Effect of calcium fluoride on sintering behaviour of SiO2-CaO-Na2O-MgO glass-ceramic system

    Directory of Open Access Journals (Sweden)

    Bahman Mirhadi

    2012-09-01

    Full Text Available The crystallization characteristics of glasses based on the SiO2-CaO-Na2O-MgO (SCNM system containing calcium fluoride (CaF2 have been investigated by differential thermal analysis (DTA, X-ray diffraction (XRD and scanning electron microscopy (SEM. The partial replacement of CaO by CaF2 in the studied glass-ceramics led to the development of different crystalline phase assemblages, including wollastonite and diopside using various heat-treatment processes. With the increase of CaF2 content, the crystallization temperature of the glass and the strength of the crystallization peak temperature decreases. Addition of CaF2 up to 6.0 mol%, as expected, improved the sinterability. This sample reached to maximum density by sintering at 950 °C.

  1. OS GRAFITES E AS PICHAÇÕES EM LÍNGUA ESTRANGEIRA NA PAISAGEM LINGUÍSTICA DA CIDADE DE JUIZ DE FORA/MG

    Directory of Open Access Journals (Sweden)

    Mariana Schuchter Soares

    2015-12-01

    Full Text Available RESUMO: O objetivo deste trabalho é discutir a presença de línguas estrangeiras em pichações e grafites na cidade de Juiz de Fora/MG, considerando os tempos de superdiversidade (VERTOVEC, 2007 em que estamos inseridos. A superdiversidade está ligada a fatores como o surgimento e a expansão da Internet, a questões de mobilidade social e ao desenvolvimento da tecnologia em geral, que têm promovido contatos linguístico-culturais muito mais intensos e a ampliação dos repertórios comunicativos (RYMES, 2010. Assim, essa pesquisa de abordagem qualitativa busca descrever essa realidade que existe no mundo inteiro em diferentes graus, considerando dados coletados em entrevistas com pichadores e grafiteiros, e fotografias da paisagem linguística da cidade.

  2. Na, K, Ca, Mg, and U-series in fossil bone and the proposal of a radial diffusion-adsorption model of uranium uptake.

    Science.gov (United States)

    Cid, A S; Anjos, R M; Zamboni, C B; Cardoso, R; Muniz, M; Corona, A; Valladares, D L; Kovacs, L; Macario, K; Perea, D; Goso, C; Velasco, H

    2014-10-01

    Fossil bones are often the only materials available for chronological reconstruction of important archeological sites. However, since bone is an open system for uranium, it cannot be dated directly and therefore it is necessary to develop models for the U uptake. Hence, a radial diffusion-adsorption (RDA) model is described. Unlike the classic diffusion-adsorption (D-A) model, RDA uses a cylindrical geometry to describe the U uptake in fossil bones. The model was applied across a transverse section of a tibia of an extinct megamammal Macrauchenia patachonica from the La Paz Local Fauna, Montevideo State, Uruguay. Measurements of spatial distribution of Na, K, Ca, and Mg were also performed by neutron activation analysis (NAA). Gamma-ray spectrometric U-series dating was applied to determine the age of the bone sample. From U concentration profile, it was possible to observe the occurrence of a relatively slow and continuous uranium uptake under constant conditions that had not yet reached equilibrium, since the uranium distribution is a ∪-shaped closed-system. Predictions of the RDA model were obtained for a specific geochemical scenario, indicating that the effective diffusion coefficient D/R in this fossil bone is (2.4 ± 0.6)10(-12) cm(2)s(-1). Mean values of Na, K, Ca, and Mg contents along the radial line of the fossil tibia are consistent with the expected behavior for spatial distributions of these mineral elements across a modern bone section. This result indicates that the fossil tibia may have its mineral structure preserved. Copyright © 2014 Elsevier Ltd. All rights reserved.

  3. Avaliação do risco ambiental utilizando FMEA em um laticínio na região de Lavras – MG

    Directory of Open Access Journals (Sweden)

    Amanda Cássia Nogueira

    2010-11-01

    Full Text Available Uma metodologia que vem sendo paulatinamente empregada na avaliação do risco ambiental durante o processo produtivo é o FMEA (do inglês – Failure Mode and Effect Analysis, definida como uma ferramenta que busca em princípio, evitar ou minimizar as chances do produto ou processo falhar, aumentando assim a sua confiabilidade. Considerando que o impacto ambiental gerado por um laticínio apresenta diversos riscos em potencial, este método foi empregado na avaliação do risco ambiental durante o processamento de queijos em um laticínio da região de Lavras – MG. Um levantamento das entradas e saídas de cada operação do processo foi feito e as saídas que apresentaram risco ambiental foram analisadas utilizando-se um formulário para aplicação do método. Ações foram sugeridas de acordo com as mesmas, colaborando para a diminuição da probabilidade do risco ambiental gerado ocorrer à medida que estas ações foram sendo aplicadas, contribuindo para um processo mais sustentável e eficiente.

  4. X-ray effects on the activity of a Mg2+-dependent, Na+- and K+-activable microsomal membrane ATP-ase system

    International Nuclear Information System (INIS)

    Froehlich, D.

    1978-01-01

    The bahviour of a Mg 2+ -dependent, Na + - and K + -activable ATP-ase sytem on irradiation was investigated using a microsome fraction of guinea pig myocardial cells prepared by fractionated centrifugation. The Na + - and K + -activable component, transport-ATPase, was particularly radiation-sensitive. Three stages of development were observed for a 1,500 R radiation damage until 24 h p.r.. In the first stage, until 30 minutes p.r., the activity of transport-ATP-ase was inhibited. This was followed by repair processes which had reached a peak value clearly higher than the control values at 4 hours p.r.. In the third stage, the activity was reduced again; 15 and 24 hours after termination of exposure, values again were nearly the same as after 30 minutes where a maximum was observed for this radiation dose. Radiation-induced electrolyte displacements, active transport, and radiation-induced inhibition of transport-ATP-ase were correlated and discussed; the assumption was that changes in, the electrolyte conditions in the membranes on irradiation are at least partly due to the described inhibition of transport-ATP-ase. (orig./AJ) [de

  5. CONTEXTO GEOMORFOLÓGICO DE OCORRÊNCIA DE CAVIDADES EM QUARTZITO NA REGIÃO SUDESTE DE DIAMANTINA/MG

    Directory of Open Access Journals (Sweden)

    Fernanda Souza

    2014-12-01

    Full Text Available O presente trabalho tem como objetivo interpretar o contexto geográfico associado à ocorrência de cavidades nos quartzitos da região sudeste de Diamantina/MG - Serra do Espinhaço Meridional. O procedimento metodológico foi composto por revisão bibliográfica; levantamento cartográfico; trabalhos de campo; topografia das cavidades; levantamento das linhas estruturais na área externa e no interior das cavidades; petrografia; coleta, laminação e análise química qualitativa de depósitos químicos e interpretação do contexto geográfico de inserção das cavidades. Os resultados obtidos demonstram que a ocorrência de feições cársticas na área de estudo pode estar relacionada a um conjunto de fatores. Assim, a presença de poliminerais, como mica e feldspato; diferentes camadas estratigráficas da Formação Sopa-Brumadinho (quartzitos monomíticos e conglomerados; os lineamentos estruturais e as características geomorfológicas locais são fatores que contribuem para a ocorrência de cavidades na região. A hipótese de formação das cavidades indica a probabilidade de ocorrência de dissolução, produção de materiais inconsolidados, lixiviação, remobilização dos grãos alterados e ampliação dos condutos através de abatimentos.

  6. Persistent pre-seismic signature detected by means of Na-K-Mg geothermometry records in a saline spring of Vrancea area (Romania

    Directory of Open Access Journals (Sweden)

    H. Mitrofan

    2010-02-01

    Full Text Available A six year-long hydrochemical monitoring operation was conducted in Vrancea seismic zone (Romania, addressing a saline spring that proved to be suitable for Na-K-Mg geothermometry diagnosis. During the considered time-interval (2003–2009, only one important earthquake (mb=5.8 occurred in Vrancea region, this circumstance providing an unambiguous reference-moment between pre-seismic and post-seismic periods. On occurrence of that earthquake, an anomalous fluctuation of the Na-K temperature was detected – a result largely similar to previous ones recorded worldwide (California, southwest Egypt, northeast India. Yet such fluctuations may not necessarily be induced by earthquake-associated processes: they can occur also "routinely", possibly reflecting some environmental, meteorologically-induced "noise". It was therefore important to examine whether the variations observed in the data values could be plausibly related to a seismogenesis process. By additionally investigating (in a "scattterplot" diagram the correlation between the Na-K temperatures and the values of a so-called "maturity index", a specific pattern emerged, with pre-seismic data-points plotting in a distinct domain of the diagram; moreover, those data-points appeared to describe a "drift away" pathway with respect to the remaining data-points "cluster", recorded during the subsequent 4 years of post-seismic monitoring. The "drift away" pattern persistently evolved for at least 18 months, ending just before the mb=5.8 earthquake and consequently suggesting the existence of some kind of long-term precursory phenomenon.

  7. INFLUÊNCIA DOS FATORES EDÁFICOS NA VARIAÇÃO FLORÍSTICA DE FLORESTA ESTACIONAL SEMIDECIDUAL, EM VIÇOSA, MG

    Directory of Open Access Journals (Sweden)

    Antonio Jorge Tourinho Braga

    2015-08-01

    Full Text Available RESUMOO objetivo deste estudo foi verificar a possível correlação dos fatores edáficos na distribuição dos indivíduos de espécies arbóreas e a similaridade florística entre as populações, em dois trechos distintos de um fragmento de Floresta Estacional Semidecidual, em Viçosa, MG (20°46' S e 42°52' W. No trabalho, foram amostrados os indivíduos arbóreos superiores ou iguais a 15 cm (CAP, presentes em 20 parcelas de 25×10 m, estando metade dessas alocadas (10 em cada trecho de floresta. Na área das parcelas, foram coletadas amostras de solo (0-10 cm e submetidas às análises química e física. Os resultados dos atributos físicos e químicos do solo indicaram variações conforme as mudanças na topografia do terreno. A análise de correspondência canônica (CCA indicou correlação significativa entre a distribuição das espécies arbóreas avaliadas no perfil topográfico e a fertilidade do solo, enquanto a comparação entre as espécies pertencentes às florestas inicial e avançada apontou baixa similaridade florística. Verificou-se ainda que espécies como Casearia arborea, Ocotea laxa, Myrcia fallax, Siparuna guianensis, Apuleia leiocarpa, Matayba elaeagnoides e Sparattosperma leucanthum estão associadas a solos argilosos mais ácidos, de encostas e com maior teor de alumínio, permitindo o uso delas em programas de recuperação ambiental.

  8. Kinetics of struvite to newberyite transformation in the precipitation system MgCl2-NH4H2PO4NaOH-H2O.

    Science.gov (United States)

    Babić-Ivancić, Vesna; Kontrec, Jasminka; Brecević, Ljerka; Kralj, Damir

    2006-10-01

    The influence of the initial reactant concentrations on the composition of the solid phases formed in the precipitation system MgCl(2)-NH(4)H(2)PO(4)-NaOH-H(2)O was investigated. The precipitation diagram constructed shows the approximate concentration regions within which struvite, newberyite, and their mixtures exist at 25 degrees C and an aging time of 60 min. It was found that immediately after mixing the reactant solutions, struvite (MgNH(4)PO(4).6H(2)O) precipitated in nearly the whole concentration area, while newberyite (MgHPO(4).3H(2)O) appeared mostly within the region of the excess of magnesium concentration. It was also found that after aging time of 60 min the precipitation domain of struvite alone is much broader than that of newberyite or the domain of their coexistence, and shows that struvite is more abundant in the systems in which the initial concentration of ammonium phosphate is higher than that of magnesium. The kinetics of struvite to newberyite transformation (conversion) was systematically studied under the conditions of different initial reactant concentrations and different initial pH in the systems in which a mixture of both phases precipitated spontaneously. The struvite to newberyite conversion period was found to be strongly related to the ratio of initial supersaturations, S(N)/S(S), rather than to the any particular physical quantity that can describe and predict the behavior of the precipitation system. Experimental data suggest a solution-mediated process as a most possible transformation mechanism. Along with a continuous monitoring of the changes in the liquid phase, the content of struvite in the solid phase was estimated by means of a Fourier transform infrared (FT-IR) method, developed for this particular precipitation system.

  9. Horta orgânica de ervas medicinais: inclusão social na comunidade da Barra em Muriaé/MG - Brasil

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    José Luiz de Freitas Paixão

    2013-09-01

    Full Text Available Foi implantada uma horta orgânica de ervas medicinais na comunidade da Barra (Muriaé, MG com o objetivo de inclusão social de pessoas carentes ao permitir acesso ao tratamento por fitoterapia. O início das atividades foi em janeiro de 2006, com a escolha das espécies, obtenção de mudas e instalação da horta. As 40 espécies selecionadas, sob manejo agroecológico, eram indicadas com terapêutica aos 25 principais problemas de saúde levantados na comunidade. O formato didático da horta, representando o corpo humano, serviu como referência às indicações de uso de cada espécie. A horta foi mantida até meados de 2012 na Barra e transferida ao IFMURIAÉ, em área de cultivo agroecológico, no Bairro Sofoco, onde se realizam as práticas do curso de técnico em agroecologia. A comunidade da Barra auxiliou desde as primeiras ações, sendo atuante na colheita das plantas medicinais. As plantas coletadas foram levadas a sala anexa à Paróquia local onde se realizou o processamento pós-colheita e o preparo de fitoterápicos. A dispensação dos preparados foi em outra sala cedida pela Paróquia. As formas fitoterápicas disponibilizadas à população foram de uso interno (erva seca, tintura, xarope e externo (creme, gel, pomada, sendo as mais procuradas: gel, tintura e xarope. De 2006 a 2012 foram  32.400 atendimentos, média de 385 pessoas/mês. O sucesso do projeto se reflete no aumento do número de espécies utilizadas, passando de 40 espécies em 2006 para 170 espécies em 2012, dentre elas: alecrim de jardim (Rosmarinus officinalis, alfavaca (Ocimum basilicum, amora (Morus alba, arnica brasileira (Solidago microglossa, calêndula (Calendula officinalis, camomila (Matricaria chamomilla, capim gordura (Melinis minutiflora, cavalinha (Equisetum arvense, chapéu-de-couro (Echinodorus grandiflorus e espinheira santa (Maytenus aquifolium.

  10. A produção de Serapilheira em uma Floresta Estacional Decidual na Região do Pontal-MG

    Directory of Open Access Journals (Sweden)

    Nicolas Fernandes Martins

    2012-12-01

    Full Text Available Durante o período de um ano, foram avaliadas a quantidade de serapilheira depositada e a sazonalidade de sua queda em um ecossistema de Floresta Estacional Decidual, próximo ao município de Ituiutaba-MG. . Para o estudo foram utilizados 20 coletores de madeira e de formato quadrado e circular, tendo 50 por 50 cm de largura, sendo o chamado de EG, os de 25 por 25 cm chamados de G formato quadrados sendo os circulares de 15 cm de raio chamados de M e os de 9 cm de raio denominados de P. Foram distribuídos de maneira aleatória numa reserva permanente. O material depositado foi coletado mensalmente, separado em diferentes frações, secado em uma estufa e posteriormente pesado. O trabalho fora desenvolvido na fazenda Três Irmãos, localizado a 20 km do Município de Ituiutaba (sentido a Uberlândia na BR-365. Dessa forma este estudo teve por objetivos quantificar a produção anual de serapilheira e correlações com as variáveis climáticas. O principal componente da serrapilheira fora as folhas, e os meses maiores totais de deposição da serapilheira ocorreram nos meses de novembro e dezembro diferentes de muitos trabalhos na literatura. O total de serapilheira registrada em todos os coletores foi de 8975 kg.ha-1 e no coletor EG onde a amostragem dos dados foram melhores obtivemos um decorrência de serrapilheira num total 4101 kg.ha-1, sendo 2611 kg.ha-1 (63,66% de folhas, 704 kg.ha-1 (17,16 % de caule, 453 kg.ha-1 (11,04 % de frutos e 333 kg.ha-1 (8,12% de material indiferenciado. A precipitação pluviométrica não fora o fator principal para a queda das folhas, devido a floresta estacional ter passado por uma perturbação não compreendida pelo estudo. O melhores resultados foram referentes a temperatura, quando ouve uma elevação na temperatura tivemos maior produção de serapilheira.

  11. Determination of Ca, Cr, Cu, Fe, K, Mg, Na and Zn in Brazilian medicinal plants by neutron activation and atomic absorption; Determinacao de Ca, Cr, Cu, Fe, K, Mg, Na e Zn em plantas medicinais brasileiras por ativacao neutronica e absorcao atomica

    Energy Technology Data Exchange (ETDEWEB)

    Carvalho, Ricardo P. de; Sabino, Claudia de Vilhena S.; Franco, Milton B.; Amaral, Angela M.; Guedes, Joao B.; Assis, Adilson de C. [Centro de Desenvolvimento da Tecnologia Nuclear (CDTN), Belo Horizonte, MG (Brazil); Leite, Simone C.A.L.; Silva, Isabel R. [Pontificia Univ. Catolica de Minas Gerais, Belo Horizonte, MG (Brazil)

    2002-07-01

    Medicinal plants are available in the markets in Belo Horizonte, Minas Gerais. The objective of this work is to investigate the Ca, Cr, Cu, Fe, K, Mg, Na e Zn concentrations in two lots of usually known diuretics plants (azeitona do mato, cabelo de milho, cavalinha, cervejinha do campo, chapeu de couro, congonha de bugre, marmelinho do campo and quebra pedra) bought with an interval of time - six months - between the purchases. The elemental concentrations were determined applying k{sub 0} instrumental neutron activation analysis and atomic absorption spectrophotometry analysis. (author)

  12. Variabilidade temporal da precipitação mensal e anual na estação climatológica de Uberaba-MG Temporal variability of monthly rains in the climatological station of Uberaba-MG, Brazil

    Directory of Open Access Journals (Sweden)

    José Waldemar da Silva

    2003-06-01

    Full Text Available A análise da variabilidade espacial e da variabilidade temporal de atributos naturais vem recebendo destaque nos últimos tempos, devido à possibilidade de se realizar estimativas com maior precisão, destacando-se entre esses atributos a precipitação pluviométrica. Objetivou-se com este trabalho estudar o comportamento temporal das chuvas mensais na Estação Climatológica de Uberaba - MG, utilizando-se a série das precipitações pluviais mensais e anuais de 1914 a 2000. Os dados referentes à Estação Climatológica de Uberaba - Estação Experimental Getúlio Vargas - foram obtidos no Laboratório de Climatologia e Recursos Hídricos do Instituto de Geografia - Universidade Federal de Uberlândia. Realizou-se análise exploratória dos dados por meio de algumas estatísticas, como média aritmética, desvio-padrão, valores máximos e valores mínimos e histogramas. A análise de variabilidade temporal foi feita por meio de semivariâncias. Verificou-se uma tendência à normalidade nos meses correspondentes ao período de outubro a março e assimetria no período de abril a setembro. Observou-se a presença do efeito pepita puro, não constatando-se dependência temporal e, conseqüentemente, estudos e inferências estatísticas podem ser realizados com base em métodos da estatística não espacial.The purpose of this work was to verify the temporal dependence of monthly rainfall in the climatological station of Uberaba-MG, Brazil, using geostatistical methods. It was evaluated the precipitation in series of rainfall monthly data from 1914 to 2000. It were done exploratory and geostatistical analysis. The exploratory analysis was made by calculating basic statistics and histograms and the geostatistical analysis was made by semivariogram. According to the results, a normality tendence was verified in months from october to march. From april to September, it was verified an asymmetric tendence. Semivaviograms showed the nugget

  13. Levantamento florísitico na Estação Ecológica do Tripuí, Ouro Preto, MG Floristic inventory in the Tripuí Ecological Station, Ouro Preto, MG

    Directory of Open Access Journals (Sweden)

    Gilberto Pedralli

    1997-12-01

    Full Text Available Realizou-se o levantamento florístico na Estação Ecológica do Tripuí, Ouro Preto, MG (43º34'33" W e 20º23'45"S. O clima da região é do tipo mesotérmico, com inverno seco (Cwb sg. Köppen e com temperaturas médias oscilando entre 14º e 19ºC. A Estação apresenta como principais tipos vegetacionais as florestas mesófilas estacionais, o cerrado, a vegetação aquática (brejos, lagoa artificial e córregos e as formações sucessionais ('candeial'. Para o levantamento florístico utilizou-se o método de parcelas e coletas por trilhas e caminhos, sendo identificadas 101 famílias, 242 gêneros e 462 espécies. As famílias que apresentaram maior riqueza específica foram Asteraceae (10,82%, Melastomataceae (8,22%, Myrtaceae (7,14% e Rubiaceae (4,76%.A floristic inventory was carried out in Tripuí Ecological Station, Ouro Preto, Minas Gerais state (43º34'33" W and 20º23'45"S. In this region the climate, according to Koppen's classification, is Cwb, i.e., with a mild summer and a dry winter. The main vegetation types identified were semideciduous mesophytic forests, cerrado, aquatic vegetation ('brejos', artificial lake and creeks and secondary formations ('candeial'. Through the floristic inventory in plots, trails and ways were identified 101 families, 242 genera and 462 species. Asteraceae (10,82%, Melastomataceae (8,22%, Myrtaceae (7,14% and Rubiaceae (4,76% were the families with the greatest specific richness.

  14. Flora de importância polinífera para Apis mellifera (L. na região de Viçosa, MG

    Directory of Open Access Journals (Sweden)

    Anna Frida Hatsue Modro

    2011-10-01

    Full Text Available Procurou-se conhecer a flora de importância polinífera para Apis mellifera (L. na região de Viçosa, MG, em período de entressafra de mel, entre agosto e dezembro de 2005. O experimento foi realizado em dois apiários distintos, cada um com cinco colmeias. As cargas retidas nos coletores de pólen instalados nas colmeias foram analisadas quanto à origem botânica. As plantas em floração no entorno dos apiários foram coletadas e identificadas. A maioria das plantas de importância polinífera para abelhas na região de Viçosa era nativa, localizada em jardins e com hábito arbóreo. Pela análise palinológica, verificou-se que espécies como Anadenanthera colubrina, Arecaceae sp., Baccharis dracunculifolia, B. melastomaefolia, Coffea spp., Emilia sagittata, Eugenia uniflora, Mikania cordifolia, M. hirsutissima, Myrcia fallax, Psidium guajava, Vernonia condensata, V. diffusa, V. lanuginosa e V. mariana são potenciais recursos poliníferos a serem utilizados no período de entressafra do mel. Os resultados indicaram a importância de plantas localizadas em áreas abertas para o forrageamento de pólen por A. mellifera e confirmaram o potencial polinífero da região estudada, durante o período de entressafra do mel.

  15. Study and application of neutron activation analysis and related methods for determination of content of Na, K, Cu, Co, Mn, Ca, Mg, Fe, P and Zn in a lot of speciality fruits of Vietnam (banana, orange, longan, dragon and mango)

    International Nuclear Information System (INIS)

    Nguyen Van Minh; Le Thi Ngoc Trinh; Le Thai Dung; Ta Thi Tuyet Nhung; Nguyen Dang Khoa; Nguyen Tien Dat; Nguyen Thi Hong Tham; Cao Dong Vu

    2007-01-01

    To study the content of trace elements Na, K, Cu, Co, Mn, Ca, Mg, Fe, P and Zn in the speciality fruits is necessary and very important. We collected the studying samples in four Cities such as: Dalat, NhaTrang, HoChiMinh and BinhDuong. The studying samples are: Banana, Orange, Longan, Dragon and Mango. These samples were dried in the Deepfreezer at -40 o C. We analyzed Na, K, Cu, Co, Mn, Ca, Mg, Fe and Zn by neutron activation analysis (INAA, RNAA) and after irradiation measured total β for P. The studying results were shown in the tables. (author)

  16. Study and application of neutron activation analysis and related methods for determination of content of Na, K, Cu, Co, Mn, Ca, Mg, Fe, P and Zn in a lot of speciality fruits of Vietnam (banana, orange, longan, dragon and mango)

    Energy Technology Data Exchange (ETDEWEB)

    Minh, Nguyen Van; Ngoc Trinh, Le Thi; Dung, Le Thai; Tuyet Nhung, Ta Thi; Khoa, Nguyen Dang; Dat, Nguyen Tien; Hong Tham, Nguyen Thi; Vu, Cao Dong [Center for Analytical Techniques, Nuclear Research Institute, Dalat (Viet Nam)

    2007-12-15

    To study the content of trace elements Na, K, Cu, Co, Mn, Ca, Mg, Fe, P and Zn in the speciality fruits is necessary and very important. We collected the studying samples in four Cities such as: Dalat, NhaTrang, HoChiMinh and BinhDuong. The studying samples are: Banana, Orange, Longan, Dragon and Mango. These samples were dried in the Deepfreezer at -40{sup o}C. We analyzed Na, K, Cu, Co, Mn, Ca, Mg, Fe and Zn by neutron activation analysis (INAA, RNAA) and after irradiation measured total {beta} for P. The studying results were shown in the tables. (author)

  17. Pedogeoquímica em perfis de alteração na região de Lavras (MG. II - elementos menores e elementos das terras raras

    Directory of Open Access Journals (Sweden)

    M. P. C. Lacerda

    2002-03-01

    Full Text Available Na região de Lavras, MG, analisou-se o comportamento geoquímico dos elementos menores (EM e elementos das terras raras (ETR ao longo da evolução pedogenética em perfis de solos com horizonteB textural, individualizados a partir de rochas de composição ácida, intermediária e básica do substrato. Nos perfis, realizaram-se análises químicas de EM e ETR, avaliando perdas e ganhos pelo balanço químico de massa. O estudo possibilitou o grupamento dos EM em duas classes: (amobilidade moderada a alta: perda da rocha fresca até o sólum; (bmobilidade moderada: enriquecimento relativo e eventualmente real no sólum. O comportamento dos ETR revelou grande mobilidade ao longo da evolução dos perfis de alteração.

  18. Sintering and crystallization behavior of CaMgSi2O6-NaFeSi2O6 based glass-ceramics

    International Nuclear Information System (INIS)

    Goel, Ashutosh; Kansal, Ishu; Ferrari, Anna Maria; Pascual, Maria J.; Barbieri, Luisa; Bondioli, Federica; Lancellotti, Isabella; Ribeiro, Manuel J.; Ferreira, Jose M. F.

    2009-01-01

    We report on the synthesis, sintering, and crystallization behaviors of a glass with a composition corresponding to 90 mol % CaMgSi 2 O 6 -10 mol % NaFeSi 2 O 6 . The investigated glass composition crystallized superficially immediately after casting of the melt and needs a high cooling rate (rapid quenching) in order to produce an amorphous glass. Differential thermal analysis and hot-stage microscopy were employed to investigate the glass forming ability, sintering behavior, relative nucleation rate, and crystallization behavior of the glass composition. The crystalline phase assemblage in the glass-ceramics was studied under nonisothermal heating conditions in the temperature range of 850-950 deg. C in both air and N 2 atmosphere. X-ray diffraction studies adjoined with the Rietveld-reference intensity ratio method were employed to quantify the amount of crystalline phases, while electron microscopy was used to shed some light on the microstructure of the resultant glass-ceramics. Well sintered glass-ceramics with diopside as the primary crystalline phase were obtained where the amount of diopside varied with the heating conditions.

  19. CALIBRACIÓN E IMPLEMENTACIÓN DEL MODELO MG PARA LA ESTIMACIÓN DE CAUDALES MÁXIMOS EN COLOMBIA CALIBRAÇÃO E IMPLEMENTAÇÃO DO MODELO MG PARA A ESTIMATIVA DE CAUDAIS MÁXIMOS NA COLÔMBIA CALIBRATION AND IMPLEMENTATION OF MG MODEL FOR ESTIMATING PEAK FLOWS IN COLOMBIA

    Directory of Open Access Journals (Sweden)

    Andrés Felipe Duque

    2010-12-01

    Full Text Available El propósito de este trabajo es calibrar un modelo para la estimación de caudales máximos que se adapte a las características hidrológicas, geomorfológicas y de cobertura vegetal de las cuencas colombianas. Por esta razón, se calibraron los parámetros del modelo probabilístico MG para todo el territorio colombiano, sus principales regiones geográficas y subregiones hidrológicamente homogéneas. Para la obtención de las ecuaciones analíticas del modelo MG se utilizaron los registros históricos de caudales máximos de 277 estaciones limnigráficas distribuidas a lo largo del territorio colombiano. Los resultados obtenidos aplicando el modelo MG calibrado y otros métodos comúnmente utilizados con el mismo propósito fueron comparados entre sí y se encontraron valores muy semejantes. El modelo MG calibrado en este trabajo se muestra como una opción viable para la estimación de caudales máximos en cuencas con información escasa en Colombia.O propósito deste trabalho é calibrar um modelo para a estimativa de caudais máximos que se adapte às características hidrológicas, geomorfológicas e de cobertura vegetal das bacias colombianas. Por esta razão, se calibraram os parâmetros do modelo probabilístico MG para todo o território colombiano, suas principais regiões geográficas e sub-regiões hidrologicamente homogêneas. Para a obtenção das equações analíticas do modelo MG se utilizaram os registros históricos de caudais máximos de 277 estações limnigráficas distribuídas ao longo do território colombiano. Os resultados obtidos aplicando o MG calibrado e outros métodos comumente utilizados com o mesmo propósito foram comparados entre si e se encontraram valores muito semelhantes. O modelo MG calibrado neste trabalho se amostra como uma opção viável para a estimativa de caudais máximos em bacias com informação escassa na Colômbia.The purpose of this paper is calibrate a model for estimating peak flows

  20. Effects of administration of potassium- and sodiumchlorides on faecal excretions and salivary and alimentary concentrations of, Na, K, 134Cs, Ca, Mg and P in reindeer fed a lichen diet

    Directory of Open Access Journals (Sweden)

    Hans Staaland

    1998-02-01

    Full Text Available A comparison of the effects of administration of 350 mmol d-1 of KC1 or NaCl on faecal excretions, salivary concentrations and concentrations and pools of Na, K, 134Cs, Ca, Mg, P, and water in the alimentary tract of reindeer was carried out using three groups of three 10 months old reindeer fed a lichen diet. One group was used as a control group with no mineral supplementation. The level of K supplementation mimicked K intakes from summer pastures. NaCl was given at a rate which would mimic intake from salt licks by domestic ruminants of similar body size. Treatment with KC1 increased the salivary and alimentary concentrations and the alimentary pool sizes of K and faecal excretion of K increased. A decrease in l34Cs concentrations in all parts of the gastrointestinal tract indicated greater absorption of 134Cs during the KC1 treatment than in NaCl treated and control animals. Increased intake of Na or K had no significant effect on the digestibility of the lichen diet, but urine production increased. Little effects on pools or concentrations of Ca, Mg and P were observed. NaCl treatment increased urinary and faecal excretion of Na, but did not affect the metabolism of any of the other studied minerals.

  1. Ne nado obizhatsja na Karzaja / Sven Mikser

    Index Scriptorium Estoniae

    Mikser, Sven, 1973-

    2008-01-01

    Afganistani presidendi Hamid Karzai arvates on liitlasvägede Helmandi provintsis viibimise ajal olukord provintsis halvenenud. Autori arvates on Eesti rahukaitseväed teinud oma tööd Afganistani olukorra stabiliseerimisel hästi, ja seda jätkatakse

  2. Iõhvi ne sobral deneg na skulpturu dudotshnika

    Index Scriptorium Estoniae

    2008-01-01

    Jõhvi vallakunstnik Kalev Prits plaanib Jõhvi kontserdimaja juurde puu otsa paigaldada vilepillimängija skulptuuri ja kogub selleks sponsorraha. Tõenäoliselt asuvad uue skulptuuri kallal tööle läti kunstnik Edvin Kruminsh ja Aivar Simson. Kruminshi kätetöö on Jõhvi sissesõidutee ääres seisev metallist siil. Simpson on Jõhvi teinud karude ja lindude kujusid ning siilikujulisi lillepotte

  3. A new aqueous activity model for geothermal brines in the system Na-K-Ca-Mg-H-Cl-SO4-H2O from 25 to 300 degrees C

    DEFF Research Database (Denmark)

    Hingerl, Ferdinand F.; Wagner, Thomas; Kulik, Dmitrii A.

    2014-01-01

    A revised formulation (named REUNIQUAC) of the Extended Universal QUAsiChemical (EUNIQUAC) activity model has been developed, which fits excess thermodynamic properties of binary and selected aqueous ternary electrolyte solutions in the system Na-K-Ca-Mg-H-Cl-SO4-H2O over temperatures from 298 to...

  4. IKONIČNE REPREZENTACIJE NEKATERIH MATEMATIČNIH POJMOV PRI OSNOVNOŠOLCIH

    OpenAIRE

    Podgoršek, Manja

    2015-01-01

    Ikonične reprezentacije so reprezentacije, ki predstavljajo prehod med enaktivnimi in simbolnimi reprezentacijami. Ikonične reprezentacije matematičnih pojmov na razredni stopnji so v veliki večini primerov grafične. V magistrski nalogi smo s pomočjo preizkusa znanja želeli ugotoviti, na kakšen način učenci od 5. do 8. razreda osnovne šole grafično ponazarjajo vnaprej podane matematične pojme (odštevanje s prehodom, številski izraz z oklepaji, izraz dela celote in potenca). Zanimalo nas je tu...

  5. Estudo da relação pedomorfogeológica na distribuição de solos com horizontes B textural e B nítico na paisagem de Lavras (MG Study of the relationship pedo-geomorphological in the soil distribution with argillic horizons in the landscape of Lavras (MG, Brazil

    Directory of Open Access Journals (Sweden)

    Marilusa Pinto Coelho Lacerda

    2008-02-01

    Full Text Available O entendimento das relações entre geologia, geomorfologia e pedologia auxilia nas atividades de classificação dos solos e na avaliação da distribuição pedológica de uma área. Este trabalho foi motivado pela escassez de estudos dessa natureza na região de Lavras (MG, onde ocorrem várias classes de solos, relacionados com a grande variedade petrológica do material de origem e com a ocorrência de domínios geomorfológicos distintos. O objetivo deste trabalho foi estudar as relações entre material de origem (relação pedogeológica, classes de relevo (relação pedogeomorfológica e solos com horizontes B textural e B nítico, visando propor um modelo da distribuição desses solos na paisagem de Lavras. Os solos com horizontes B textural e B nítico de ocorrência regional foram selecionados de acordo com o estádio de evolução, que permite preservar características das rochas parentais. Esses solos são desenvolvidos nessa região em relevos ondulados a forte ondulados, originando diferentes classes de solos com horizontes B textural e B nítico relacionados ao material de origem. Para desenvolvimento deste estudo, foram realizadas a interpretação petrológica do substrato rochoso e a individualização do relevo, por meio de classes de declividade. Mediante campanhas de campo, foram selecionados e caracterizados perfis representativos das principais classes dos solos em estudo e foram avaliadas as relações pedogeológicas associadas às relações pedogeomorfológicas, permitindo a proposição de um modelo preditivo de distribuição de solos com horizontes B textural e B nítico na paisagem de Lavras (MG.The understanding of the relationships between geology, geomorphology and pedology underlies activities of soil classification and the evaluation of the pedological distribution of an area. This study was motivated by the lack of reports of this nature for the region of Lavras (MG, where several soil classes occur

  6. Uso de serviços odontológicos de forma regular na população de Montes Claros, MG, Brasil

    Directory of Open Access Journals (Sweden)

    Danilo Lima Carreiro

    Full Text Available Resumo Avaliou-se o uso de serviços odontológicos de forma regular entre os residentes de Montes Claros (MG, assim como os aspectos relacionados a esse uso. Estudo transversal realizado com amostra complexa probabilística por conglomerados. Utilizou-se a análise de regressão logística (OR/IC95%. Dos 2582 participantes do estudo, 761 necessitaram de serviços odontológicos e obtiveram acesso a eles há menos de um ano. Destes, 262 (35,8% fizeram uso dos serviços de forma regular. Esse uso foi maior entre os indivíduos na faixa etária “≥ 18 ≤ 37”; com escolaridade “igual ou maior a 9 anos”; que classificaram sua saúde bucal, saúde geral e a aparência dos dentes e gengivas como “ótima/boa”; que não relataram dor nos dentes e gengivas nos últimos seis meses; que relataram que o “prestador da assistência possuía habilidades adequadas”; que “sempre/frequentemente” receberam informações sobre higiene bucal e sobre dieta/alimentação. Em adição, esse uso foi menor entre os que classificaram o tempo para fazer perguntas sobre o problema bucal ou tratamento como “regular/ruim/péssimo”. Conclui-se que o uso de serviços odontológicos de forma regular foi relativamente baixo, sendo associado a características pessoais, condições subjetivas de saúde e características relacionadas aos serviços.

  7. Temperature dependent luminescence and energy transfer properties of Na2SrMg(PO4)2:Eu2+, Mn2+ phosphors.

    Science.gov (United States)

    Geng, Dongling; Shang, Mengmeng; Zhang, Yang; Lian, Hongzhou; Lin, Jun

    2013-11-21

    Eu(2+) singly and Eu(2+)/Mn(2+) co-doped Na2SrMg(PO4)2 (NSMP) phosphors have been prepared via a high-temperature solid-state reaction process. Upon UV excitation of 260-360 nm, the NSMP:xEu(2+) phosphors exhibit a violet band located at 399 nm and a blue band centered at 445 nm, which originate from Eu(2+) ions occupying two different crystallographic sites: Eu(2+)(I) and Eu(2+)(II), respectively. Excitation wavelengths longer than 380 nm can selectively excite Eu(2+)(II) to emit blue light. Energy transfer processes in the Eu(2+)(I)-Eu(2+)(II) and Eu(2+)-Mn(2+) pairs have been observed and investigated by luminescence spectra and decay curves. The emission color of as-prepared samples can be tuned by changing the relative concentrations of Eu(2+) and Mn(2+) ions and adjusting the excitation wavelength. Under UV excitation of 323 nm, the absolute quantum yield of NSMP:0.005Eu(2+) is 91%, which is higher than most of the other Eu(2+)-doped phosphors reported previously. The temperature dependent luminescence properties and decay curves (4.3-450 K) of NSMP:Eu(2+) and NSMP:Eu(2+), Mn(2+) phosphors have been studied in detail. Thermal quenching of Eu(2+) has been observed while the emission band of Mn(2+) shows a blue-shift and an abnormal increase of intensity with increasing temperature. The unusual thermal quenching behavior indicates that the NSMP compound can serve as a good lattice host for Mn(2+) ions which can be used as a red-emitting phosphor. Additionally, the lifetimes for Eu(2+)(I) and Eu(2+)(II) increase with increasing temperatures.

  8. Energy transfer and tunable luminescence of Na{sub 2}(Y,Eu)Mg{sub 2}V{sub 3}O{sub 12} phosphors for white LED applications

    Energy Technology Data Exchange (ETDEWEB)

    Zheng, Zhang; Wanjun, Tang, E-mail: tangmailbox@126.com

    2016-01-15

    Highlights: • Iso-structural garnet-type Na{sub 2}(Y,Eu)Mg{sub 2}V{sub 3}O{sub 12} solid solution were synthesized. • Efficient energy transfer from [VO{sub 4}]{sup 3−} to Eu{sup 3+} ions in this phosphor is observed obviously. • Tuning the Y/Eu ratio generates the varied hues from yellowish-green to reddish-orange. • This kind of phosphor can be potentially used in UV pumped LEDs. - Abstract: A series of solid-solution phosphors Na{sub 2}(Y,Eu)Mg{sub 2}V{sub 3}O{sub 12} were prepared using solution combustion reaction. X-ray diffraction studies verified the formation of single phase Na{sub 2}(Y,Eu)Mg{sub 2}V{sub 3}O{sub 12} with garnet structure. Na{sub 2}(Y,Eu)Mg{sub 2}V{sub 3}O{sub 12} phosphors show not only a broad emission band with a maximum at 510 nm due to the [VO{sub 4}]{sup 3−} group but also several sharp emission lines due to the Eu{sup 3+} ions. The energy transfer from [VO{sub 4}]{sup 3−} to Eu{sup 3+} was discussed on the base of the spectral analysis. The color-tunable emissions of the Na{sub 2}(Y,Eu)Mg{sub 2}V{sub 3}O{sub 12} phosphor as a function of Y/Eu ratio are realized by continuously generating the varied hues from yellowish-green to reddish-orange. This indicates that the obtained phosphor may have potential applications in the field of UV-based white LEDs.

  9. AS PAISAGENS QUARTZÍTICAS DO PLANALTO DO ALTO RIO GRANDE: RELAÇÕES ENTRE ROCHA-RELEVO-SOLO-VEGETAÇÃO NA SERRA DE CARRANCAS (MG

    Directory of Open Access Journals (Sweden)

    Roberto Marques Neto

    2012-04-01

    Full Text Available O presente artigo tem por objetivo realizar uma discussão integrada das relações entre os elementos físicos e a dimensão humana como entes determinantes na definição do complexo paisagístico na serra de Carrancas, estrutura quartzítica localizada no município que lhe dá nome, na parte meridional do estado de Minas Gerais.

  10. Structural characteristics of Mg-doped (1-x)(K0.5Na0.5)NbO3-xLiSbO3 lead-free ceramics as revealed by Raman spectroscopy

    International Nuclear Information System (INIS)

    Zhu, W L; Meng, Y; Pezzotti, G; Zhu, J L; Wang, M S; Zhu, B; Zhu, X H; Zhu, J G; Xiao, D Q

    2011-01-01

    This paper presents a Raman spectroscopic study of compositional-change-induced structure variation and of the related mechanism of Mg doping in LiSbO 3 (LS)-modified (K 0.5 Na 0.5 )NbO 3 (KNN) ceramics. With increasing LS content from 0 to 0.06, a discontinuous shift towards higher wavenumbers was found for the band position of the A 1g (v 1 ) stretching mode of KNN, accompanied by a clearly nonlinear broadening of this band and a decrease in its intensity. Such morphological changes in the Raman spectrum result from two factors: (i) changes in polarizability/binding strength of the O-Nb-O vibration upon incorporation of Li ions in the KNN perovskitic structure and (ii) a polymorphic phase transition (PPT) from orthorhombic to tetragonal (O → T) phase at x > 0.04. Upon increasing the amount, w, of Mg dopant incorporated into the (1-x)KNN-xLS ceramic structure, the intensity of the Raman bands are enhanced, while the peak position and the full width at half maximum of the A 1g (v 1 ) mode was found to experience a clear dependence on both w and x. Raman characterization revealed that the mechanism of Mg doping is strongly correlated with the concentration of Li in the perovskite structure: Mg 2+ ions will preferentially replace Li + ions for low Mg doping while replace K/Na ions for higher doping of Mg. The PPT O → T was also found to be altered by the introduction of Mg and the critical value of LS concentration, x O-T , for incipient O → T transition in the KNN-xLS-wMT system was strongly dependent on Mg content, with x O→T being roughly equal to 0.04 + 2w, for the case of dilute Mg alloying. (paper)

  11. Photoionization of Ne8+

    Science.gov (United States)

    Pindzola, M. S.; Abdel-Naby, Sh. A.; Robicheaux, F.; Colgan, J.

    2014-05-01

    Single and double photoionization cross sections for Ne8+ are calculated using a non-perturbative fully relativistic time-dependent close-coupling method. A Bessel function expansion is used to include both dipole and quadrupole effects in the radiation field interaction and the repulsive interaction between electrons includes both the Coulomb and Gaunt interactions. The fully correlated ground state of Ne8+ is obtained by solving a time-independent inhomogeneous set of close-coupled equations. Propagation of the time-dependent close-coupled equations yields single and double photoionization cross sections for Ne8+ at energies easily accessible at advanced free electron laser facilities. This work was supported in part by grants from NSF and US DoE. Computational work was carried out at NERSC in Oakland, California, NICS in Knoxville, Tennessee, and OLCF in Oak Ridge, Tennessee.

  12. Anestesia espinhal com 10 mg de bupivacaína hiperbárica associada a 5 µg de sufentanil para cesariana: estudo de diferentes volumes Anestesia espinal con 10 mg de bupivacaína hiperbárica asociada a 5 µg de sufentanil para cesárea: estudio de diferentes volúmenes Spinal Block with 10 mg of hyperbaric bupivacaine associated with 5 µg of sufentanil for cesarean section: study of different volumes

    Directory of Open Access Journals (Sweden)

    Angélica de Fátima de Assunção Braga

    2010-04-01

    Full Text Available JUSTIFICATIVA E OBJETIVOS: Diversos fatores influenciam na dispersão cefálica da solução anestésica no espaço subaracnóideo, entre os quais destacam-se as alterações fisiológicas inerentes à gravidez, baricidade, dose e volume do anestésico local. O objetivo deste estudo foi avaliar em cesarianas a efetividade e os efeitos colaterais de diferentes volumes da associação de bupivacaína hiperbárica e sufentanil por via subaracnóidea. MÉTODO: Quarenta pacientes, ASA I e II, submetidas à cesariana eletiva sob raquianestesia distribuídas em dois grupos, de acordo com o volume da solução anestésica empregada: Grupo I (4 mL e Grupo II (3 mL. Nos dois grupos o anestésico local empregado foi a bupivacaína hiperbárica (10 mg-2 mL associada ao sufentanil (5 µg-1 mL. No Grupo I, para obtenção do volume de 4 mL, foi adicionado 1 mL de solução fisiológica a 0,9%. Foram avaliados: latência do bloqueio; nível máximo do bloqueio sensitivo; grau do bloqueio motor; tempo para regressão do bloqueio motor; duração total da analgesia; efeitos adversos maternos e repercussões neonatais. RESULTADOS: A latência, o nível máximo do bloqueio sensitivo, o grau e o tempo para regressão do bloqueio motor foram semelhantes nos dois grupos; a duração da analgesia foi maior no Grupo I, com diferença significativa em relação ao Grupo II. Os efeitos adversos ocorreram com frequência semelhante em ambos os grupos. Ausência de alterações cardiocirculatórias maternas e repercussões neonatais. CONCLUSÕES: A bupivacaína hiperbárica na dose de 10 mg associada ao sufentanil na dose de 5 µg, com volume de 4 mL, foi mais eficaz que a mesma associação em menor volume (3 mL, proporcionando melhor analgesia intra e pós-operatória, sem repercussões materno-fetais.JUSTIFICATIVA Y OBJETIVOS: Diversos factores influyen en la dispersión cefálica de la solución anestésica en el espacio subaracnoideo, entre los cuales se destacan las

  13. Usando splines cúbicas na modelagem matemática da evolução populacional de Pirapora/MG

    Directory of Open Access Journals (Sweden)

    José Sérgio Domingues

    2014-08-01

    Full Text Available O objetivo desse trabalho é obter um modelo matemático para a evolução populacional da cidade de Pirapora/MG, baseando-se apenas nos dados de censos e contagens populacionais do Instituto Brasileiro de Geografia e Estatística (IBGE. Para isso, é utilizada a interpolação por splines cúbicas, pois as técnicas de interpolação linear e polinomial, e também o modelo logístico, não se ajustam bem a essa população. Os dados analisados não são equidistantes, então, utiliza-se como amostra anos separados com passo h de 10 anos. Os valores descartados inicialmente e as estimativas populacionais para esse município, descritos pela Fundação João Pinheiro, serviram para validação do modelo construído, e para a estimativa das diferenças percentuais de previsão, que não ultrapassaram os 2,21%. Ao se considerar que o padrão de evolução populacional de 2000 a 2010 se manterá até 2020, estima-se as populações da cidade de 2011 a 2020, cuja diferença percentual média foi de apenas 0,49%. Conclui-se que o modelo se ajusta muito bem aos dados, e que estimativas populacionais em qualquer ano de 1970 e 2020 são confiáveis. Além disso, o modelo permite a visualização prática de uma aplicação dessa técnica na modelagem populacional, e, portanto, também pode ser utilizada para fins didáticos.Palavras-chave: Splines cúbicas. Interpolação. Modelagem matemática. Evolução populacional. Pirapora.Using cubic splines on mathematical modeling of the population evolution of Pirapora/MGThe main objective of this paper is to obtain a mathematical model for the evolution of the population in Pirapora/MG, based only on data from censuses and population counts from Brazilian Institute of Geography and Statistics (IBGE. For this, the cubic spline interpolation is used because the technique of linear and polynomial interpolation, and also the logistic model do not fit well with this population. The analyzed data are not equidistant

  14. Study of the 26Al(n,p)26Mg and 26Al(n,α)23Na reactions using the 27Al(p,p')27Al inelastic scattering reaction

    International Nuclear Information System (INIS)

    Benamara, S; De Séréville, N; Hammache, F; Stefan, I; Roussel, P; Ancelin, S; Assié, M; Guillot, J; Le Crom, B; Lefebvre, L; Adsley, P; Laird, A M; Barton, C; Diget, C; Fox, S; Coc, A; Deloncle, I; Hamadache, C; Kiener, J; Lefebfre-Schuhl, A

    2016-01-01

    26 Al was the first cosmic radioactivity ever detected in the galaxy as well as one of the first extinct radioactivity observed in refractory phases of meteorites. Its nucleosynthesis in massive stars is still uncertain mainly due to the lack of nuclear information concerning the 26 Al(n,p) 26 Mg and 26 Al(n,α) 23 Na reactions. We report on a single and coincidence measurement of the 27 Al(p,p') 27 Al(p) 26 Mg and 27 Al(p,p') 27 Al(α) 23 Na reactions performed at the Orsay TANDEM facility aiming at the spectroscopy study of 27 Al above the neutron threshold. Fourteen states are observed for the first time within 350 keV above the 26 Al+n threshold. (paper)

  15. Re-examining the 26Mg(α ,α')26Mg reaction: Probing astrophysically important states in 26Mg

    Science.gov (United States)

    Adsley, P.; Brümmer, J. W.; Li, K. C. W.; Marín-Lámbarri, D. J.; Kheswa, N. Y.; Donaldson, L. M.; Neveling, R.; Papka, P.; Pellegri, L.; Pesudo, V.; Pool, L. C.; Smit, F. D.; van Zyl, J. J.

    2017-11-01

    Background: The 22Ne(α ,n )25Mg reaction is one of the neutron sources for the s process in massive stars. The properties of levels in 26Mg above the α -particle threshold control the strengths of the 22Ne(α ,n )25Mg and 22Ne(α ,γ )26Mg reactions. The strengths of these reactions as functions of temperature are one of the major uncertainties in the s process. Purpose: Information on the existence, spin, and parity of levels in 26Mg can assist in constraining the strengths of the 22Ne(α ,γ )26Mg and 22Ne(α ,n )25Mg reactions, and therefore in constraining s -process abundances. Methods: Inelastically scattered α particles from a 26Mg target were momentum-analyzed in the K600 magnetic spectrometer at iThemba LABS, South Africa. The differential cross sections of states were deduced from the focal-plane trajectory of the scattered α particles. Based on the differential cross sections, spin and parity assignments to states are made. Results: A newly assigned 0+ state was observed in addition to a number of other states, some of which can be associated with states observed in other experiments. Some of the deduced Jπ values of the states observed in the present study show discrepancies with those assigned in a similar experiment performed at RCNP Osaka. The reassignments and additions of the various states can strongly affect the reaction rate at low temperatures. Conclusion: The number, location, and assignment of levels in 26Mg that may contribute to the 22Ne+α reactions are not clear. Future experimental investigations of 26Mg must have an extremely good energy resolution to separate the contributions from different levels. Coincidence experiments of 26Mg provide a possible route for future investigations.

  16. Carbonate mineral solubility at low temperatures in the Na-K-Mg-Ca-H-Cl-SO 4-OH-HCO 3-CO 3-CO 2-H 2O system

    Science.gov (United States)

    Marion, Giles M.

    2001-06-01

    Carbonate minerals have played an important role in the geochemical evolution of Earth, and may have also played an important role in the geochemical evolution of Mars and Europa. Several models have been published in recent years that describe chloride and sulfate mineral solubilities in concentrated brines using the Pitzer equations. Few of these models are parameterized for subzero temperatures, and those that are do not include carbonate chemistry. The objectives of this work are to estimate Pitzer-equation bicarbonate-carbonate parameters and carbonate mineral solubility products and to incorporate them into the FREZCHEM model to predict carbonate mineral solubilities in the Na-K-Mg-Ca-H-Cl-SO 4-OH-HCO 3-CO 3-CO 2-H 2O system at low temperatures (≤25°C) with a special focus on subzero temperatures. Most of the Pitzer-equation parameters and equilibrium constants are taken from the literature and extrapolated into the subzero temperature range. Solubility products for 14 sodium, potassium, magnesium, and calcium bicarbonate and carbonate minerals are included in the model. Most of the experimental data are at temperatures ≥ -8°C; only for the NaHCO 3-NaCl-H 2O and Na 2CO 3-NaCl-H 2O systems are there bicarbonate and carbonate data to temperatures as low as -21.6°C. In general, the fit of the model to the experimental data is good. For example, calculated eutectic temperatures and compositions for NaHCO 3, Na 2CO 3, and their mixtures with NaCl and Na 2SO 4 salts are in good agreement with experimental data to temperatures as low as -21.6°C. Application of the model to eight saline, alkaline carbonate waters give predicted pHs ranging from 9.2 to 10.2, in comparison with measured pHs that range from 8.7 to 10.2. The model suggests that the CaCO 3 mineral that precipitates during seawater freezing is probably calcite and not ikaite. The model demonstrates that a proposed salt assemblage for the icy surface of Europa consisting of highly hydrated MgSO 4

  17. Beyond Chloride Brines: Variable Metabolomic Responses in the Anaerobic Organism Yersinia intermedia MASE-LG-1 to NaCl and MgSO4 at Identical Water Activity

    Science.gov (United States)

    Schwendner, Petra; Bohmeier, Maria; Rettberg, Petra; Beblo-Vranesevic, Kristina; Gaboyer, Frédéric; Moissl-Eichinger, Christine; Perras, Alexandra K.; Vannier, Pauline; Marteinsson, Viggó T.; Garcia-Descalzo, Laura; Gómez, Felipe; Malki, Moustafa; Amils, Ricardo; Westall, Frances; Riedo, Andreas; Monaghan, Euan P.; Ehrenfreund, Pascale; Cabezas, Patricia; Walter, Nicolas; Cockell, Charles

    2018-01-01

    Growth in sodium chloride (NaCl) is known to induce stress in non-halophilic microorganisms leading to effects on the microbial metabolism and cell structure. Microorganisms have evolved a number of adaptations, both structural and metabolic, to counteract osmotic stress. These strategies are well-understood for organisms in NaCl-rich brines such as the accumulation of certain organic solutes (known as either compatible solutes or osmolytes). Less well studied are responses to ionic environments such as sulfate-rich brines which are prevalent on Earth but can also be found on Mars. In this paper, we investigated the global metabolic response of the anaerobic bacterium Yersinia intermedia MASE-LG-1 to osmotic salt stress induced by either magnesium sulfate (MgSO4) or NaCl at the same water activity (0.975). Using a non-targeted mass spectrometry approach, the intensity of hundreds of metabolites was measured. The compatible solutes L-asparagine and sucrose were found to be increased in both MgSO4 and NaCl compared to the control sample, suggesting a similar osmotic response to different ionic environments. We were able to demonstrate that Yersinia intermedia MASE-LG-1 accumulated a range of other compatible solutes. However, we also found the global metabolic responses, especially with regard to amino acid metabolism and carbohydrate metabolism, to be salt-specific, thus, suggesting ion-specific regulation of specific metabolic pathways. PMID:29535699

  18. Beyond Chloride Brines: Variable Metabolomic Responses in the Anaerobic Organism Yersinia intermedia MASE-LG-1 to NaCl and MgSO4 at Identical Water Activity

    Directory of Open Access Journals (Sweden)

    Petra Schwendner

    2018-02-01

    Full Text Available Growth in sodium chloride (NaCl is known to induce stress in non-halophilic microorganisms leading to effects on the microbial metabolism and cell structure. Microorganisms have evolved a number of adaptations, both structural and metabolic, to counteract osmotic stress. These strategies are well-understood for organisms in NaCl-rich brines such as the accumulation of certain organic solutes (known as either compatible solutes or osmolytes. Less well studied are responses to ionic environments such as sulfate-rich brines which are prevalent on Earth but can also be found on Mars. In this paper, we investigated the global metabolic response of the anaerobic bacterium Yersinia intermedia MASE-LG-1 to osmotic salt stress induced by either magnesium sulfate (MgSO4 or NaCl at the same water activity (0.975. Using a non-targeted mass spectrometry approach, the intensity of hundreds of metabolites was measured. The compatible solutes L-asparagine and sucrose were found to be increased in both MgSO4 and NaCl compared to the control sample, suggesting a similar osmotic response to different ionic environments. We were able to demonstrate that Yersinia intermedia MASE-LG-1 accumulated a range of other compatible solutes. However, we also found the global metabolic responses, especially with regard to amino acid metabolism and carbohydrate metabolism, to be salt-specific, thus, suggesting ion-specific regulation of specific metabolic pathways.

  19. DIAGNÓSTICO DA EXPANSÃO AGROPECUÁRIA NA BACIA DO RIO UBERABA, VERÍSSIMO – MG, UTILIZANDO-SE DO SISTEMA DE INFORMAÇÃO GEOGRÁFICA

    Directory of Open Access Journals (Sweden)

    Alisson Mendonça de Almeida

    2013-07-01

    Full Text Available Esta monografia objetiva apresentar o diagnóstico agropecuário na bacia do rio Uberaba dentro do município de Verissimo – MG. O espaço temporal deste diagnóstico ambiental compreendeu o período de 1975 a 2010. Para isto, elaboraram-se os mapas de uso e ocupação do solo através dos softwares ENVI 4.0 e Idrisi The Andes 15.0 onde, pelo comando do Land Change Modeler- LCM fez-se uma previsão para o ano de 2050da degradação ambiental. O LCM mostra projeções estimadas de redução de aproximadamente 70% na área de mata nativa provocada pelo avanço das atividades agropecuárias. O aumento na área de mata nativa comprovada em 2010, se deve ao fato, da recomposição vegetal em áreas de maior declividade, ou seja, são áreas, em que o emprego de máquinas agrícolas se torna inviáveis, pois topograficamente são regiões de relevo montanhoso. Os mapas de ganhos e perdas na agricultura e na pastagem e também o mapa da transição da agricultura para pastagem, revelam que a pecuária foi a atividade econômica que mais se alastrou na bacia do rio Uberaba no município de Veríssimo-MG.

  20. Corrosion behaviour of groundnut shell ash and silicon carbide hybrid reinforced Al-Mg-Si alloy matrix composites in 3.5% NaCl and 0.3M H2SO4 solutions

    Directory of Open Access Journals (Sweden)

    Kenneth Kanayo ALANEME

    2015-05-01

    Full Text Available The corrosion behaviour of Al-Mg-Si alloy based composites reinforced with groundnut shell ash (GSA and silicon carbide (SiC was investigated. The aim is to assess the corrosion properties of Al-Mg-Si alloy based hybrid reinforced composites developed using different mix ratios of GSA (a cheaply processed agro waste derivative which served as partial replacement for SiC and SiC as reinforcing materials. GSA and SiC mixed in weight ratios 0:1, 1:3, 1:1, 3:1, and 1:0 were utilized to prepare 6 and 10 wt% of the reinforcing phase with Al‐Mg‐Si alloy as matrix using two‐step stir casting method. Mass loss and corrosion rate measurement was used to study the corrosion behaviour of the produced composites in 3.5% NaCl and 0.3M H2SO4 solutions. The results show that the Al-Mg-Si alloy based composites containing 6 and 10 wt% GSA and SiC in varied weight ratios were resistant to corrosion in 3.5% NaCl solution. The composites were however more susceptible to corrosion in 0.3M H2SO4 solution (in comparison with the 3.5% NaCl solution. It was noted that the Al-Mg-Si/6 wt% GSA-SiC hybrid composite grades containing GSA and SiC in weight ratio 1:3 and 3:1 respectively exhibited superior corrosion resistance in the 0.3M H2SO4 solution compared to other composites produced for this series. In the case of the Al-Mg-Si/10 wt% GSA-SiC hybrid composite grades, the corrosion resistance was relatively superior for the composites containing a greater weight ratio of GSA (75% and 100% in 0.3M H2SO4 solution.

  1. Integração na criação de frangos de corte na microrregião de Viçosa - MG: viabilidade econômica e análise de risco

    Directory of Open Access Journals (Sweden)

    Adelson Martins Figueiredo

    2006-12-01

    Full Text Available Na microrregião de Viçosa - MG, a criação de frango de corte via contratos de integração com a PIF-PAF S/A Indústria e Comércio tornou-se fonte adicional de renda para as propriedades rurais de pequeno e médio porte. Assim, este trabalho visou verificar a viabilidade de contratos de integração nessa região; especificamente, pretendeu-se elaborar e analisar um projeto de implantação de um aviário, determinar a rentabilidade do investimento, mensurar os riscos da atividade sob o ponto de vista do integrado e auxiliar a tomada de decisão. Para isso, calcularam-se indicadores de viabilidade econômica do projeto, como Valor Presente Líquido, Taxa Interna de Retorno e Razão Benefício/Custo; além disso, foi feita uma análise de sensibilidade para posterior análise de risco. Os resultados apontaram para a viabilidade econômica do projeto; ademais constatou-se que a sua lucratividade é mais sensível aos componentes da receita do que dos custos, sendo o preço recebido por ave a variável de maior sensibilidade. Percebeu-se também que os contratos de integração não eliminam totalmente o risco da atividade e que a integradora transfere parte do risco de preços ao produtor.The chicken production in Viçosa area is done by integration agreement with Pif Paf Company and it is an important option for increasing the income of small farmers. The objective of this paper is to check the viability of integration agreements. A project of a plant for chicken production was drawn and observed in order to determine its profitability and risks, with the purpose of helping the decision making. The Net Present Value, Internal Rate of Return, Cost/Benefit Ratio, Risk Sensitivity and Risk Analysis were calculated. The results show that the project is feasible and the profitability is more sensitive to changes in production price than changes in production costs. This study also points out that the integration agreement does not eliminate the

  2. O papel das franquias na reestruturação das cidades: a ascensão do setor em Viçosa – MG

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    Rodrigo Moraes Fritz

    2017-12-01

    Full Text Available No estágio atual do sistema capitalista no mundo, as estratégias dos agentes econômicos para sobreviverem no mercado se fazem cada vez mais notórias. Tida como uma modernização na forma de vender e comprar, o Franchising vem se destacando em todo mundo e sendo fator importante na economia dos países. As franquias são muito presentes em realidades urbanas complexas, como as metrópoles, porém, nos últimos anos, nota-se sua difusão para centros urbanos intermediários, particularmente em cidades consideradas como médias, que possuem certo grau de influência regional. A cidade de Viçosa, localizada na Zona da Mata mineira, faz parte desse conjunto de cidades que, pela centralidade que exercem, atraem capitais, pessoas e mercadorias. O crescente número de franquias na cidade em questão despertou o interesse em caracterizá-las e entendê-las do ponto de vista da sua espacialidade, bem como do potencial que apresentam para promover mudanças na estrutura urbana, já que elas são indutoras de investimentos, reestruturações e, principalmente, de centralidade.

  3. Seasonal variations in Na, K, Mg and Ca charge balance in marine brown algae from Saurashtra Coast (NW coast of India)

    Digital Repository Service at National Institute of Oceanography (India)

    Rao, Ch.K.; Singbal, S.Y.S.

    ) strongly correlated with Cl content suggesting that these cations were balanced by chloride ions. Divalent cations (Ca + Mg) seem to be balanced by the anion sulphate. Ash content of the algae was accounted by these major cations and anions. Charge...

  4. Properties of Na+ ,K+ -activated, Mg2+ -dependent ATP-hydrolyze of blood lymphocytes in patients with reаctive arthritis

    Directory of Open Access Journals (Sweden)

    O.V. Melnyk

    2013-11-01

    with RеA. We observed that Na+,K+-ATPase of peripheral blood lymphocytes of patients with RеA retains its endogenous receptor properties – sensitivity to ouabain does not change. It is assumed that under conditions of rheumatic pathology the impact on the Na+,K+-ATPase structure occurs both externally and on the cytoplasmic membrane surface. The above experimental data can be used for further clarification of the membrane mechanisms of ion exchange in immunocompetent cells of patients suffering from autoimmune diseases.

  5. Soroepidemiologia da brucelose canina causada por Brucella canis e Brucella abortus na cidade de Alfenas, MG Seroepidemiology of canine brucellosis caused by Brucella canis and Brucella abortus in Alfenas, MG, Brazil

    Directory of Open Access Journals (Sweden)

    A.C. Almeida

    2004-04-01

    Full Text Available The prevalence of canine brucellosis was evaluated in the city of Alfenas, MG through the technique of agarose gel imunodifusion for Brucella canis and slow serum agglutination test with 2-mercaptoetanol for Brucella abortus. The prevalence was of 14.2% and 2.8%, respectively, for B. canis and B. abortus. The positives, characterized by animals above one year of age (77.8%, and mongrel dogs (56.2%, showed a prevalence of 50 and 48% for males and females, respectively. The canine brucellosis was prevalent in the city principally in dogs of outskirts.

  6. Análise digital do terreno: ferramenta na identificação de pedoformas em microbacia na região de "Mar de Morros" (MG Digital terrain analysis: tool for pedoform identification in the "Mar de Morros" watershed (MG

    Directory of Open Access Journals (Sweden)

    Gabriela A. Ippoliti R.

    2005-04-01

    Full Text Available Este trabalho reporta a utilização de ferramentas de um SIG (Sistema de Informação Geográfica para o delineamento das geoformas e pedopaisagens em um estudo de caso em microbacia do município de Viçosa (MG, a partir dos dados da carta topográfica (escala 1:50.000 da região. Trabalhos de campo permitiram aferir uma exatidão global de 72 % na classificação das formas da paisagem e correlacionar as classes obtidas com as classes de solos dominantes. Após ajustes, elaborou-se um mapa síntese preliminar de distribuição de pedoformas, que auxilia no mapeamento de solos. O método de classificação das formas da paisagem baseado na geração de um MNT (Modelo Numérico do Terreno e no cálculo dos atributos do relevo (elevação, declividade, curvatura mostra-se uma alternativa rápida e econômica em comparação ao delineamento manual a partir da utilização de análise estereoscópica de fotografias aéreas.This study reports on the use of GIS (Geographical Information System tools for identifying and mapping landform units and soilscapes in a case study of a watershed in the region of Viçosa, Minas Gerais state, based on a topographical base map at a 1:50000 scale. Field work was undertaken to estimate the degree of accuracy of landform units / soilscape identification, obtaining an agreement of 72 % between the automatic and field work classification, and to correlate obtained soilscapes with dominant soil classes. After adjustments, a preliminary synthesized pedogeomorphic map was produced, which can assist soil mapping. The method of classifying landforms based on a digital elevation model (DEM as well as on the calculation of landform attributes (elevation, slope angle, slope form represents a quick and economic option, compared with manual drawing based on stereoscopical identification of landforms from aerial photographs.

  7. Breakout from the hot CNO cycle: the {sup 15}O({alpha},{gamma}) and {sup 18}Ne({alpha},p) reactions

    Energy Technology Data Exchange (ETDEWEB)

    Bradfield-Smith, W; Laird, A M; Davinson, T; Pietro, A di; Ostrowski, A N; Shotter, A C; Woods, P J [Dept. of Physics and Astronomy, Univ. of Edinburgh (United Kingdom); Cherubini, S; Galster, W; Graulich, J S; Leleux, P; Michel, L; Ninane, A; Vervier, J [Inst. de Physique Nucleaire, UCL, Louvain-la-Neuve (Belgium); Aliotta, M; Cali, D; Cappussello, F; Cunsolo, A; Spitaleri, C [INFN, Catania (Italy); Gorres, J; Wiescher, M [Notre Dame Univ. (United States); Rahighi, J [Van de Graaf Lab., Tehran (Iran, Islamic Republic of); Hinnefeld, J [Indiana Univ., South Bend (United States)

    1998-06-01

    One of the most important reactions which determines the rate of breakout from the hot CNO cycle is the {sup 15}O({alpha},{gamma}){sup 19}Ne. The reaction {sup 18}Ne({alpha},p){sup 21}Na may also provide an alternative breakout route. Experiments are being undertaken at Louvain-La-Neuve using the radioactive {sup 18}Ne beam to study these reactions by measurement of {alpha}({sup 18}Ne,p){sup 21}Na and d({sup 18}Ne,p){sup 19}Ne{sup *} {yields} {sup 15}O + {alpha} (orig.)

  8. Desenvolvimento de comprimidos de AAS 500 mg: influência do Amido 1500® na compressão direta Development of AAS 500 mg tablets influenced by direct compression (CD process

    Directory of Open Access Journals (Sweden)

    Osvaldo Albuquerque Cavalcanti

    2002-04-01

    Full Text Available O experimento teve por objetivo demonstrar a viabilidade tecnológica do desenvolvimento de comprimidos de AAS 500 mg (Ácido Acetil Salicílico, empregando processo de compressão direta (CD. O Amido 1500® foi usado como excipiente no desenvolvimento das formulações, visando investigar suas propriedades de compressibilidade, desintegração, agregação e lubrificação. Usando metodologias previstas em Farmacopéias, foram realizados ensaios tecnológicos e físico-químicos. Os resultados evidenciaram que a mistura dos pós apresentou características de fluxo e compressibilidade adequadas ao rol de excipientes para compressão direta disponíveis no mercado. A presença do Amido 1500® também interferiu no tempo de desintegração. Dentre as formulações propostas neste trabalho, a fórmula contendo 6,35% de Amido 1500® foi eleita a mais adequada por apresentar maior proximidade em relação aos produtos disponíveis no mercado brasileiroThe present work aims to show the technologic viability in the development of AAS 500 mg tablets using direct compression (CD process. We employed Starch 1500® as excipient to develop the formulations, trying to investigate its compression, disintegration, aggregation and lubrication properties. Technologic, physical and chemical essays were performed using methodologies anticipated in pharmacology. Results demonstrated that the powder mix showed characteristics of free flux and good compression qualities very important for the excipients of direct compression in the market. Starch 1500® interfered in the disintegration time. The formulation with 6,35% of Starch 1500® proposed in this work obtained a highest proximity between the products in the Brazilian market

  9. Strain mediated magnetoelectric coupling induced in (x) Bi{sub 0.5}Na{sub 0.5}TiO{sub 3}-(1−x) MgFe{sub 2}O{sub 4} composites

    Energy Technology Data Exchange (ETDEWEB)

    Manjusha [Smart Materials Research Laboratory, Department of Physics, Indian Institute of Technology Roorkee, Roorkee 247667 (India); Yadav, K.L., E-mail: klyadav35@yahoo.com [Smart Materials Research Laboratory, Department of Physics, Indian Institute of Technology Roorkee, Roorkee 247667 (India); Adhlakha, Nidhi [Elettra-Sincrotrone Trieste S.C.p.A, Area Science Park, I-34012 Trieste (Italy); Shah, Jyoti; Kotnala, R.K. [CSIR-National Physical Laboratory, New Delhi 110012 (India)

    2017-06-01

    Particulate composites of ferroelectric and ferrite phases having general formula (x)Bi{sub 0.5}Na{sub 0.5}TiO{sub 3}-(1−x)MgFe{sub 2}O{sub 4} (x=0, 0.5, 0.6, 0.7, 0.8 and 1.0), equivalently denoted as (x)BNT-(1−x)MgFO were synthesized by solid state reaction method. From X-ray diffraction analysis, the structural transformation from tetragonal to rhombohedral corresponding to BNT phase was observed in composites with x=0.5 to x=0.8. Shifting of (012) BNT peak towards left (x=0.5, 0.8) and right side (x=0.6, 0.7) observed due to occupation of Bi{sup 3+} ions at interstitial and substitutional sites into host MgFO lattice respectively. BNT produced strain in MgFO lattice. Scanning electron micrographs show closely packed microstructure with grain size variations from 0.62 to 2.90 µm. The value of magnetoelectric (ME) coupling coefficient increases from 2.42 (x=0.5) to 4.79 (x=0.8) mV/cm. Oe due to strain produced in MgFO and BNT lattices.

  10. Effects of hydrogen during SCC of Al-5Mg alloys in NaCl 30 g/l environment: experimental study and numerical simulations

    International Nuclear Information System (INIS)

    Tanguy, Dome

    2001-01-01

    After a presentation of the industrial context and of some knowledge about stress corrosion cracking (SCC) of 5xxx alloys (notably their sensitivity to intergranular dissolution in presence of the Al 3 Mg 2 phase in grain boundaries) and about other mechanisms intervening in SCC, this research thesis reports a characterization of intergranular precipitation in the alloys for which SCC and corrosion fatigue tests have been performed. Experimental results are reported and discussed (crack initiation and growth, growth rate, loading mode). The simulation of a model microstructure at the atomic scale is presented. It allows hydrogen trapping to be studied with respect to the presence of magnesium at the grain boundary. A numerical model of the Al-Mg system is developed to study the first stages of magnesium-rich intergranular precipitation. The next part reports the study of hydrogen intergranular trapping in Al-Mg by focusing on the Mg-H binding energy and on trapping occurring in the boundary. In conclusion, the author proposes a fracture mechanism at the atomic scale

  11. Modelagem hidrológica na bacia hidrográfica do Rio Aiuruoca, MG Hydrologic modeling in the Aiuruoca river basin, Minas Gerais State

    Directory of Open Access Journals (Sweden)

    Marcelo R. Viola

    2009-10-01

    Full Text Available A simulação do comportamento hidrológico de bacias hidrográficas consiste em uma das principais ferramentas na gestão dos recursos hídricos, devido à possibilidade de predição do regime fluvial. A bacia em estudo está localizada na região Alto Rio Grande, Sul de Minas Gerais, com área de drenagem de 2.094 km², constituindo uma das bacias fundamentais de drenagem para o reservatório da Usina Hidrelétrica de Camargos (UHE - Camargos/CEMIG. Neste contexto se objetivou desenvolver e aplicar um modelo hidrológico semi-conceitual, na forma semi-distribuída, para simular o comportamento hidrológico da bacia do Rio Aiuruoca, com apoio dos SIGs e sensoriamento remoto, disponibilizando uma ferramenta útil para o gerenciamento e planejamento dos recursos hídricos na região. Os resultados do coeficiente estatístico de Nash-Sutcliffe (CNS foram de 0,87 e 0,92 para as etapas de calibração e verificação, respectivamente, o que, de acordo com a classificação proposta para modelos hidrológicos de simulação, permite qualificá-lo para simulação do comportamento hidrológico na bacia hidrográfica do Rio Aiuruoca.The hydrological simulation of watersheds is one of the most important tools for water resources management due to the possibility of flow regime prediction. The Aiuruoca river basin is located in the Alto Rio Grande Basin, southern Minas Gerais State, with 2,094 km² of drainage area, and is very important drainage basin into the Camargos Hydropower Plant Reservoir (UHE - Camargos/CEMIG. In this context, this work had the objective of developing and applying a semi-conceptual hydrologic model, in semi-distributed approach, for hydrologic simulation in the Aiuruoca river basin, based on GIS and Remote Sensing tools, thus creating an important tool for management and planning of water resources in the region. The Nash-Sutcliffe coefficients (CNS, respectively, for calibration and validation periods, were 0.87 and 0

  12. Formation of hydroxyapatite onto glasses of the CaO-MgO-SiO2 system with B2O3, Na2O, CaF2 and P2O5 additives.

    Science.gov (United States)

    Agathopoulos, S; Tulyaganov, D U; Ventura, J M G; Kannan, S; Karakassides, M A; Ferreira, J M F

    2006-03-01

    New bioactive glasses with compositions based on the CaO-MgO-SiO(2) system and additives of B(2)O(3), P(2)O(5), Na(2)O, and CaF(2) were prepared. The in vitro mineralization behaviour was tested by immersion of powders or bulk glasses in simulated body fluid (SBF). Monitoring of ionic concentrations in SBF and scanning electron microscopy (SEM) observations at the surface of the glasses were conducted over immersion time. Raman and infrared (IR) spectroscopy shed light on the structural evolution occurring at the surface of the glasses that leads to formation of hydroxyapatite.

  13. Influência da queima controlada no pH do solo em povoamentos de Pinus spp, na região de Sacramento, MG.

    Directory of Open Access Journals (Sweden)

    João Gomes Neto

    2009-09-01

    Full Text Available Normal 0 21 false false false MicrosoftInternetExplorer4 O objetivo do presente trabalho foi estudar a influência da queima na variação do pH em solo com povoamento de Pinus caribaea Morolet var. hondurensis e Pinus oocarpa Schiedler. A pesquisa desenvolveu-se na região de Sacramento, Minas Gerais, em latossolo vermelho-amarelo, fase argilosa. Foram selecionados 2 talhões (250 x 600 m para cada espécie, demarcados por aceiros e queimados em dois períodos, às 10 e 16 horas, segundo a técnica de queima contra o vento. As áreas experimentais foram divididas em 8 parcelas, por espécie, em um delineamento completamente ao acaso. A coleta dos dados foi feita antes, imediatamente após, 7 meses e 14 meses após a queima em perfis de solo de 0-50 cm, abertos na interseção entre linhas e filas das árvores. Foram coletadas amostras da serrapilheira e de solo a várias profundidades. Verificou-se que após a queima, o pH em cloreto de potássio teve uma ligeira elevação, estabilizando-se até o final do período, em ambas as espécies estudadas. Para o pH em água, houve também uma ligeira elevação após a queima no Pinus oocarpa e um aumento significativo no final do período, para ambas espécies estudadas.

  14. 1 1) Pourquoi est-ce que je ne parviens pas à ouvrir les formulaires ...

    International Development Research Centre (IDRC) Digital Library (Canada)

    IDRC CRDI

    Faites vos calculs avec soin car votre demande pourrait ne pas être admissible.) 6) Existe-t-il une liste de pays admissibles dans lesquels mon établissement ou organisme est autorisé à travailler ou à avoir des partenaires ? Non, le CRDI n'a rien de tel; cependant, il ne soutient des travaux que dans les pays à faible.

  15. Avaliação Multitemporal da Susceptibilidade Erosiva na Bacia do Rio Urucuia (Mg Por Meio da Equação Universal de Perda de Solos.

    Directory of Open Access Journals (Sweden)

    Clarisse Lacerda Mata

    2007-12-01

    Full Text Available A Equação Universal de Perda de Solos (EUPS é um modelo de predição de perda de solo segundo um produto da erosividade da chuva, Fator R, da erodibilidade do solo, Fator K, do comprimento de rampa, Fator L, da declividade da vertente, Fator S, da cobertura e do manejo, Fator C, e das práticas conservacionistas, Fator P. Esta metodologia de predição de perda de solos, tem também tem sido utilizada como um instrumento de avaliação de risco à erosão e como medida de planejamento em bacias de uso agrícola. Assim, o presente trabalho tem por objetivo identificar as mudanças da erosão do solo na Bacia do Rio Urucuia, Minas Gerais, Brasil, através dos resultados da EUPS para 1987 e 2007. A Bacia do Rio Urucuia é tributária da Bacia do Rio São Francisco, com aproximadamente 25.000 km², contribui com 10% de vazão e 18% da carga de sedimentos. A metodologia usou o SIG para obtenção do Fator Topográfico (LS e o Sensoriamento Remoto para a determinação dos fatores de cobertura e  manejo (C e práticas conservacionistas (P. A classificação das imagens Landsat-TM foi feita pelo método ISODATA para dois anos, 1987 e 2007. A análise multitemporal determinou para a área estudada a ocorrência de mudanças significativas na erosão do solo, no final de vinte anos. O fator mais significativo para a degradação e erosão foi o aumento das áreas agrícolas. Os resultados mostram a distribuição espacial das distintas áreas propensas à erosão na bacia, onde práticas conservacionistas são fundamentais na prevenção da perda de solo por erosão. A análise é importante para o planejamento ambiental, e pode dar subsídio ao estabelecimento de cenários que visem o desenvolvimento sustentável da bacia.

  16. Composição corporal e exigências de macroelementos minerais (Ca, P, Mg, Na e K de bovinos não-castrados de quatro raças Zebuínas Body composition and macrominerals (Ca, P, Mg, Na and K requirements of bulls, from four Zebu breeds

    Directory of Open Access Journals (Sweden)

    Mário Fonseca Paulino

    1999-01-01

    Full Text Available A composição corporal e as exigências de macroelementos minerais (Ca, P, Mg, Na e K para ganho de peso de bovinos de quatro raças zebuínas (Gir, Guzerá, Mocho-Tabapuã e Nelore foram estimadas com 63 animais não-castrados, com idade média de 24 meses e 366 kg de PVinicial. Dezesseis animais das raças Gir, Guzerá e Mocho-Tabapuã e 15 da raça Nelore foram usados. Quinze animais, quatro das raças Gir, Guzerá e Mocho-Tabapuã e três da Nelore, foram abatidos ao início do estudo e os demais, distribuídos em três grupos, com três animais de cada raça e alimentados individualmente, ad libitum, com ração contendo 50% de concentrado na matéria seca, até atingirem peso de abate de 405, 450 e 500 kg, respectivamente. Equações de regressão do logaritmo do conteúdo corporal de macroelementos minerais, em função do logaritmo do corpo vazio (PCV, foram ajustadas para estimar os composição corporal dos constituintes para qualquer PCV, dentro do intervalo incluído na pesquisa (250 a 450kg. Pela derivação destas equações, a composição do ganho de PCV foi obtida. Animais das quatro raças não diferiram quanto à composição corporal de macroelementos minerais e às exigências líquidas para ganho de peso. Houve decréscimo na concentração dos cinco macroelementos no PCV e no peso ganho, com a elevação do PCV. As exigências líquidas estimadas para ganho de PCV, para os cinco macrominerais, foram inferiores aos valores fixos sugeridos pelo ARC (1980. Os requerimentos líquidos estimados de Ca e P para ganho de peso de um bovino não-castrado de 400 kg PV foram 16 e 24% inferiores, respectivamente, aos propostos pelo AFRC (1991.The body composition and macrominerals requirements for weight gain of four Zebu breeds (Gyr, Guzera, Mocho-Tabapuã and Nellore were estimated using 63 bulls averaging 24 months of age and 366 kg initial LW. Sixteen animals from Gir, Guzera e Mocho-Tabapuã breeds and 15 from Nellore breed

  17. Teorijske i praktične osnove TIG postupka zavarivanja

    OpenAIRE

    Horvat, Marko; Kondić, Veljko; Brezovački, Dražen

    2014-01-01

    TIG/GTAW postupak zavarivanja je elektrolučni postupak zavarivanja netaljivom elektrodom u zaštitnoj atmosferi inertnih plinova ili smjesa plinova. U radu je prikazana kratka povijest i teorijske osnove postupka, prednosti i nedostaci te osvrt na praktične osnove primjene postupka.

  18. Structural and magnetic properties of Ni0.15Mg0.1Cu0.3Zn0.45Fe2O4 ferrite prepared by NaOH-precipitation method

    International Nuclear Information System (INIS)

    Hou, Wei-xiao; Wang, Zhi

    2015-01-01

    Highlights: • NiMgCuZn ferrites were successfully prepared by low-temperature sintering. • NiMgCuZn ferrites have the advantages of both NiCuZn and MgCuZn ferrites. • NiMgCuZn ferrites exhibit high Curie temperature & high stability of permeability. - Abstract: The Ni 0.15 Mg 0.1 Cu 0.3 Zn 0.45 Fe 2 O 4 ferrite powders have been prepared by NaOH co-precipitation method and characterized by X-ray diffraction (XRD) and vibrating sample magnetometer (VSM). The XRD patterns confirm the single phase spinel structure of synthesized nanoparticles. The average crystallite size of the particles increases from 12 to 36 nm with calcining temperature (T a ) from 500 to 800 °C. The saturation magnetization (M s ) of the superparamagnetic particles was deduced by Langevin theory. Subsequently, the densification characteristics and magnetic properties of the low-temperature 950 °C-sintered ferrite bulk samples were also investigated. The magnetic measurement showed that the sintered bulk sample of T a = 600 °C has the highest initial permeability (μ i ), lowest coercivity (H c ), largest saturation magnetization (M s ) and satisfactory thermal stability of μ i . The microstructures of sintered samples were examined using field emission scanning electric microscope (FESEM). The T a has significant influence on the bulk density, initial permeability, saturation magnetization and coercivity of Ni 0.15 Mg 0.1 Cu 0.3 Zn 0.45 Fe 2 O 4 ferrite

  19. Distribuição espacial da erosão potencial e atual do solo na Bacia Hidrográfica do Rio Sapucaí, MG

    Directory of Open Access Journals (Sweden)

    Matheus Fonseca Durães

    Full Text Available RESUMO Este estudo avalia a distribuição espacial do potencial natural e atual do solo à erosão hídrica na Bacia do Rio Sapucaí, sul de Minas Gerais, utilizando a equação universal de perda de solos revisada, através de modelagem cartográfica, para a obtenção da erosão potencial (EP e da erosão atual (EA. Os resultados indicaram que a EP para a Bacia do Rio Sapucaí variou de "Muito forte", na sua região de cabeceira (Serra da Mantiqueira, a "Fraca", nas áreas com topografia mais suavizada e menor erosividade da chuva. Em relação à EA, mais de 55,17 % da Bacia do Rio Sapucaí apresenta perdas de solo abaixo de 10 t.ha-1.ano-1, significando baixo potencial atual de erosão. A identificação de áreas de risco associadas à erosão acelerada, realizadas neste estudo, fornecem subsídios fundamentais para medidas associadas ao manejo, conservação e planejamento do uso do solo.

  20. Pagamento por serviços ambientais na gestão de recursos hídricos: o caso de Extrema (MG

    Directory of Open Access Journals (Sweden)

    Mariana Heilbuth Jardim

    2015-09-01

    Full Text Available RESUMOO estudo teve como principal objetivo analisar o Programa Conservador das Águas, no município de Extrema, Minas Gerais. O caso de Extrema teve destaque por ser a primeira iniciativa municipal a realizar pagamentos para proprietários rurais em troca da garantia do fornecimento de serviços ambientais visando à melhoria dos recursos hídricos. Foi constatado que a escassez de água iminente em grandes centros urbanos é fator condicionante para priorizar áreas de atuação de programas de pagamento por serviços ambientais na gestão de recursos hídricos. O trabalho conclui que os resultados dessa primeira experiência em projetos de pagamento por serviços ambientais podem auxiliar na evolução dos cenários futuros da gestão de recursos hídricos sob a perspectiva do desenvolvimento rural mais sustentável.

  1. Efeito da segregação e solubilização do MgO na morfologia de pós de ZrO2 durante a síntese pelo método Pechini Effect of MgO segregation and solubilization on the morphology of ZrO2 powders during synthesis by the Pechini's method

    Directory of Open Access Journals (Sweden)

    P. J. B. Marcos

    2004-03-01

    Full Text Available Trabalhos realizados em vários sistemas de óxidos cerâmicos têm demonstrado que a segregação dos íons durante a síntese de materiais cerâmicos pelo método Pechini tem conseqüências muito importantes tanto para a morfologia dos pós como para a sinterização. Este trabalho tem como objetivo estabelecer a influência da segregação/solubilização do MgO na morfologia e na sinterização de pós à base de ZrO2. O estudo foi realizado em pós preparados por síntese química derivada do método Pechini a 500 °C por 15 h. Observa-se que para concentrações de MgO até o limite de solubilidade no ZrO2 ocorre o crescimento de partículas e uma diminuição da área de superfície específica por causa da solubilização e do aumento do coeficiente de difusão pela geração de vacâncias de oxigênio. Contudo, após o limite de solubilidade, ocorre um aumento gradual da área de superfície específica devido à segregação dos íons na superfície dos pós e à diminuição da energia de superfície. Concentrações de MgO até 60 % molar foram utilizadas e áreas de superfície específica tão elevadas quanto 120 m²/g foram obtidas, mas as fases cristalinas formadas foram exclusivamente da zircônia solução sólida sem a presença de fases cristalinas de MgO.Studies carried out in several ceramic oxide systems have shown that segregation of ions during synthesis of ceramic materials by the Pechini's method has important morphology consequences for the powder. The aim of this paper is to establish the influence of the MgO segregation/solubilization on the morphology of ZrO2 powders. The study was performed in powders prepared by chemical synthesis derived from the Pechini's method at 500 ºC for 15 h. It is observed that MgO concentrations up to the solubility limit promote ZrO2 particle coarsening and a reduction of specific surface area by increasing the diffusion coefficient. However, MgO amounts higher than the solubility

  2. Stosowanie wenlafaksyny w dawkach większych niż 225 mg na dobę. Bilans ryzyka i korzyści

    Directory of Open Access Journals (Sweden)

    Łukasz Święcicki

    2014-09-01

    Full Text Available W pracy omówiono wyniki badań dotyczących stosowania wenlafaksyny w dawkach przewyższających 225 mg/dobę. Wydaje się, że stosowanie takich dawek może być celowe zwłaszcza u pacjentów z depresją lekooporną. W dawkach do 225 mg/dobę wenlafaksyna jest lekiem o działaniu głównie serotoninergicznym (hamującym wychwyt zwrotny serotoniny. W dawce przewyższającej 225 mg/dobę lek wywiera istotne działanie na hamowanie wychwytu zwrotnego noradrenaliny. Nie bez znaczenia jest również fakt, że w przypadku dawek w zakresie 225–300 mg/dobę zwiększa się hamowanie wychwytu zwrotnego serotoniny. Choć efekt ten jest stosunkowo niewielki (oceniany na około 5%, to zdaniem części autorów może być klinicznie znaczący. Cechy te sprawiają, że wenlafaksyna w dużych dawkach jest lekiem skuteczniejszym niż leki z grupy selektywnych inhibitorów wychwytu zwrotnego serotoniny (SSRI oceniane jako cała grupa, a także skuteczniejszym niż fluoksetyna. Pod względem skuteczności wenlafaksyna jest także lekiem najmniej porównywalnym z lekami z grupy trójpierścieniowych leków przeciwdepresyjnych. Tolerancja wenlafaksyny nawet w dużych dawkach jest zazwyczaj zadowalająca. Problem mogą stanowić przykre objawy występujące podczas odstawiania wenlafaksyny (zawroty głowy, nudności, wymioty, ogólne złe samopoczucie, nie ma jednak dostatecznych dowodów wskazujących na to, że częstość występowania oraz stopień nasilenia tych objawów mogłyby zależeć od stosowanej dawki leku – jest to raczej reakcja indywidualna.

  3. Accumulation of /sup 90/Sr, Ca, Mg, K and Na in crane's-bill plants cultivated on soil and hydroponics

    Energy Technology Data Exchange (ETDEWEB)

    Analyan, V.L.; Sarkisyan, G.A. (AN Armyanskoj SSR, Erevan. Inst. Agrokhimicheskikh Problem i Gidroponiki)

    1981-01-01

    Accumulation of /sup 90/Sr in plants under the conditions of soil and hydroponic cultures from the viewpoint of the possibility of obtaining ''pure'' vegetable production has been studied. Predominant absorption of /sup 90/Sr by soil plants as compared with calcium is shown. In the course of using the hydroponic cultivation method predominant radiostrontium absorption has been manifested to all investigated nuclides including potassium. The accumulation coefficients analysis has shown that among soil plants the first place is occupied by potassium, while the /sup 90/Sr coefficients are greater than Ca on hydroponics, where the true, not distorted by soil sorption processes absorptive plant capacity has been manifested, the first places in the series are occupied by /sup 90/Sr and K, then come Ca and Mg.

  4. Experimental Determination of Lead Interactions with Citrate and EDTA in NaCl and MgCl2 Solutions to High Ionic Strength and Its Applications.

    Energy Technology Data Exchange (ETDEWEB)

    Xiong, Yongliang [Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States). Carlsbad Programs Group; Kirkes, Leslie Dawn [Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States). Carlsbad Programs Group; Westfall, Terry [Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States). Carlsbad Programs Group; Marrs, Cassandra [Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States). Carlsbad Programs Group; Knox, Jandi [Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States). Carlsbad Programs Group; Burton, Heather Lynn [Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States). Carlsbad Programs Group

    2017-09-01

    For this study, the interactions of lead with citrate and ethylenediaminetetraacetate (EDTA) are investigated based on solubility measurements as a function of ionic strength at room temperature (22.5 ± 0.5°C) in NaCl and MgCl2 solutions. The formation constants (log β10 ) for Pb[C3H5O(COO)3]– (abbreviated as PbCitrate) and Pb[(CH2COO)2N(CH2)2N(CH2COO)2)]2– (abbreviated as PbEDTA2–) Pb2+ + [C3H5O(COO)3]3– = Pb[C3H5O(COO)3] (1) Pb2+ + (CH2COO)2N(CH2)2N(CH2COO)2)4- = Pb[(CH2COO)2N(CH2)2N(CH2COO)2)]2– (2) are evaluated as 7.28 ± 0.18 (2σ) and 20.00 ± 0.20 (2σ), respectively, with a set of Pitzer parameters describing the specific interactions in NaCl and MgCl2 media. Based on these parameters, the interactions of lead with citrate and EDTA in various low temperature environments can be accurately modelled.

  5. Mild hydrothermal crystal growth of new uranium(IV) fluorides, Na{sub 3.13}Mg{sub 1.43}U{sub 6}F{sub 30} and Na{sub 2.50}Mn{sub 1.75}U{sub 6}F{sub 30}: Structures, optical and magnetic properties

    Energy Technology Data Exchange (ETDEWEB)

    Yeon, Jeongho; Smith, Mark D. [Department of Chemistry and Biochemistry, University of South Carolina, Columbia, SC 29208 (United States); Tapp, Joshua; Möller, Angela [Department of Chemistry and Texas Center for Superconductivity, University of Houston, Houston, TX 77204 (United States); Loye, Hans-Conrad zur, E-mail: zurloye@mailbox.sc.edu [Department of Chemistry and Biochemistry, University of South Carolina, Columbia, SC 29208 (United States)

    2016-04-15

    Two new uranium(IV) fluorides, Na{sub 3.13}Mg{sub 1.43}U{sub 6}F{sub 30} (1) and Na{sub 2.50}Mn{sub 1.75}U{sub 6}F{sub 30} (2), were synthesized through an in situ mild hydrothermal route, and were structurally characterized by single crystal X-ray diffraction. The compounds exhibit complex crystal structures composed of corner- or edge-shared UF{sub 9} and MF{sub 6} (M=Mg, Mn) polyhedra, forming hexagonal channels in the three-dimensional framework, in which ordered or disordered divalent metal and sodium atoms reside. The large hexagonal voids contain the nearly regular M(II)F{sub 6} octahedra and sodium ions, whereas the small hexagonal cavities include M(II) and sodium ions on a mixed-occupied site. Magnetic susceptibility measurements yielded effective magnetic moments of 8.36 and 11.6 µ{sub B} for 1 and 2, respectively, confirming the presence and oxidation states of U(IV) and Mn(II). The large negative Weiss constants indicate the spin gap between a triplet and a singlet state in the U(IV). Magnetization data as a function of applied fields revealed that 2 exhibits paramagnetic behavior due to the nonmagnetic singlet ground state of U(IV) at low temperature. UV–vis diffuse reflectance and X-ray photoelectron spectroscopy data were also analyzed. - Graphical abstract: Two new quaternary U(IV) fluorides, Na{sub 3.13}Mg{sub 1.43}U{sub 6}F{sub 30} and Na{sub 2.50}Mn{sub 1.75}U{sub 6}F{sub 30}, were crystallized via an in situ reduction step of U(VI) to U(IV) under mild hydrothermal conditions. The compounds show complex crystal structures based on the 3-D building block of U{sub 6}F{sub 30}. Magnetic property measurements revealed that the U(IV) exhibits a nonmagnetic singlet ground state at low temperature with a spin gap. - Highlights: • Na{sub 3.13}Mg{sub 1.43}U{sub 6}F{sub 30} and Na{sub 2.50}Mn{sub 1.75}U{sub 6}F{sub 30} have been synthesized and characterized. • The U(IV) fluorides exhibit complex three-dimensional crystal structures. • The

  6. Fatores relacionados à institucionalização de crianças e adolescentes acolhidos na comarca de Uberaba - MG - doi: 10.5020/18061230.2012.p139

    Directory of Open Access Journals (Sweden)

    Daniela Tavares Gontijo

    2012-11-01

    Full Text Available Objetivo: Descrever o perfil sociodemográfico e os fatores relacionados à institucionalização de crianças e adolescentes acolhidos na Comarca de Uberaba, no ano de 2009. Métodos: Estudo descritivo, documental, retrospectivo, no qual se incluíram todas as crianças e adolescentes que estiveram abrigados, por decisão judicial, na Comarca de Uberaba-MG, Brasil, no ano de 2009. Os dados coletados nos processos judiciais foram analisados através de estatística descritiva. Resultados: Das 169 crianças e adolescentes acolhidos em 2009, 82 (51,47% eram do sexo feminino. As idades de 4 a 6 anos (33 - 19,53% e 13 a 15 anos (30 - 17,75% foram as faixas etárias mais prevalentes. Entre as crianças em idade escolar, somente 41 (24,26% tinham a escolaridade adequada à faixa etária. Em 109 (65,08% dos casos não se identificou a figura paterna, presente na composição familiar. Os principais motivos para o acolhimento foram negligência, condições socioeconômicas da família, uso de álcool e drogas pelos responsáveis, maus tratos, abandono, violência física e violência sexual. Conclusões: Os dados apontam para o processo de vulnerabilidade social vivenciado pelas famílias, que suscita a articulação e fortalecimento de políticas e ações intersetoriais, com a participação ativa da sociedade na busca da promoção de melhores condições de vida e de saúde das crianças e adolescentes.

  7. PRIMERJAVA GEODETSKIH METOD NA ZAHTEVNEM GRADBENEM OBJEKTU

    OpenAIRE

    Reberčnik, Matic

    2017-01-01

    V projektni nalogi smo v uvodnih poglavjih predstavili različne načine izvajanja geodetskih meritev, ki jih v gradbeništvu uporabljamo pri analizi pomikov in deformacij gradbenih konstrukcij ter terena, na katerem so le-te postavljene. V nadaljevanju opisujemo terestične in GNSS (globalni navigacijski satelitski sistem) metode, ki smo jih uporabljali pri izvajanju meritev na izbranem premostitvenem objektu avtocestnega odseka v Sloveniji (zaradi varovanja podatkov ga imenujemo Objekt 1). Pod...

  8. Modelling of Ne-like copper X-ray laser driven by 1.2 ps short pulse and 280 ps background pulse configuration

    International Nuclear Information System (INIS)

    Demir, A.; Kenar, N.; Goktas, H.; Tallents, G.J.

    2004-01-01

    Detailed simulations of Ne-like Cu x-ray laser are undertaken using the EHYBRID code. The atomic physics data are obtained using the Cowan code. The optimization calculations are performed in terms of the intensity of background and the time separation between the background and the short pulse. The optimum value is obtained for the conditions of a Nd:glass laser with 1.2 ps pulse at 4.4 x 10 15 W cm -2 irradiance pumping a plasma pre-formed by a 280 ps duration pulse at 5.4 x 10 12 W cm -2 with peak-to-peak pulse separation set at 300 ps. X-ray resonance lines between 6 A and 15 A emitted from copper plasmas have been simulated. Free-free and free-bound emission from the Si-, Al-, Mg-, Na-, Ne- and F-like ions is calculated in the simulation. (author)

  9. From $^{27}$Mg to ${33}$Mg transition to the "Island of inversion"

    CERN Document Server

    Yordanov, Deyan

    Since introduced in nuclear physics, the concept of shell structure and magic numbers has governed our understanding of nuclear matter in atomic nuclei close to stability. Nuclear species with a magic number of protons and/or neutrons are known to be more stable and close to spherical in shape. Experimental studies of 30Ne, 31Na and 32Mg, systems with a closed neutron sd shell (N=20), provide evidence for a ground-state deformation in these nuclei. The observed phenomenon is understood as an inversion of the normal spherical ground-state configuration, expected according to the traditional shell model, with deformed states governed by particle-hole excitations over the N=20 shell gap. The properties of nuclei in this Island of inversion are of particular importance for the theoretical modeling of the region. The present doctoral dissertation reports on the first determination of the nuclear ground-state spins and magnetic moments of 31,33Mg, obtained by means of laser spectroscopy in combination with nuclear...

  10. Sistemas de manejo em plantios florestais de eucalipto e perdas de solo e água na região do Vale do Rio Doce, MG

    Directory of Open Access Journals (Sweden)

    Mayesse Aparecida da Silva

    2011-12-01

    Full Text Available A erosão hídrica é a principal responsável pela perda da capacidade produtiva dos solos sob florestas plantadas e alteração da quantidade e qualidade da água em sub-bacias. Assim, este trabalho objetivou avaliar a influência dos sistemas de manejo adotados nos plantios florestais com eucalipto (eucalipto em nível - EN, eucalipto em desnível - ED e eucalipto em desnível com queima - EDQ sobre as perdas de solo e água por erosão hídrica em relação às perdas em floresta nativa (FN, pastagem (PP e solo descoberto (SD, num Latossolo Vermelho (LV e Latossolo Vermelho-Amarelo (LVA, e indicar qual o período mais crítico no manejo do solo, em relação à erosão hídrica, durante o ciclo de cultivo do eucalipto. O estudo foi conduzido em dois municípios: Belo Oriente (LVA e Guanhães (LV, situados no Vale do Rio Doce, região Centro-Leste do estado de Minas Gerais. Com exceção do sistema SD no LVA, as perdas de solo foram abaixo do limite de tolerância admissível para essas classes de solos, nestas regiões, que são de 11,22 Mg ha-1 ano-1 no LV e de 7,17 Mg ha-1 ano-1 para o LVA. As perdas de água nos sistemas com eucalipto foram menores no plantio em nível, no LVA. Nos sistemas com eucalipto, os períodos iniciais após o plantio apresentam as maiores perdas de solo e água com redução ao final do ciclo. Por outro lado, no LVA os sistemas com solo descoberto e floresta nativa apresentaram aumento das perdas de água com o decorrer do tempo avaliado, indicando adequação dos sistemas com eucalipto.

  11. PLESNA VZGOJA IN RAZLIČNE GLASBENE ZVRSTI

    OpenAIRE

    Trstenjak, Simona

    2016-01-01

    Namen diplomskega dela Plesna vzgoja in različne glasbene zvrsti je s pomočjo teoretičnih izhodišč, ob opazovanju plesnega izražanja otrok, ugotoviti vpliv posamezne glasbene zvrsti na otroka pri plesni vzgoji. Diplomsko delo je sestavljeno iz dveh delov, teoretičnega in empiričnega. V teoretičnem delu smo predstavili teorijo plesne vzgoje v predšolskem obdobju, kjer smo podrobneje opisali sam pomen in vpliv plesne vzgoje na predšolskega otroka, vsebine, cilje in načela ter metode plesne vzgo...

  12. Systematic of fusion incompleteness in 20Ne induced reactions at energy 4-7 MeV/nucleon

    International Nuclear Information System (INIS)

    Ali, Sabir; Ahmad, Tauseef; Kumar, Kamal

    2016-01-01

    In the present work, a study of fusion incompleteness using the 20 Ne projectile over 51 V, 55 Mn and 59 Co and targets has been carried out. The experiment involving 20 N e+ 51 V system was performed at VECC, Kolkata, India. The targets of thickness range 1.19-1.50 rug/cm 2 of spectroscopically pure 51 V (purity 99.99%) were prepared by depositing on aluminum backing of thickness range 1.47-1.64 mg/cm 2 by the vacuum evaporation technique at the target lab of VECC. A stack of six 51 V targets was irradiated for ≈ 11 hrs by 20 Ne 6+ beam at ≈145 MeV. The irradiation of the stack covered the desired energy range of 82-145 MeV. The beam current was ≈ 40 nA during the irradiation hours. The energy of the 20 Ne ion beam incident on each target foil was calculated using stopping power software SRIM. The overall error in the present work is estimated to be ≤20%

  13. Sorption-enhanced water gas shift reaction for high-purity hydrogen production: Application of a Na-Mg double salt-based sorbent and the divided section packing concept

    International Nuclear Information System (INIS)

    Lee, Chan Hyun; Lee, Ki Bong

    2017-01-01

    Highlights: •Na-Mg double salt-based sorbent was used for high-temperature CO 2 sorption. •Divided section packing concept was applied to the SE-WGS reaction. •High-purity H 2 was produced from the SE-WGS reaction with divided section packing. •High-purity H 2 productivity could be further enhanced by modifying packing method. -- Abstract: Hydrogen is considered a promising environmentally benign energy carrier because it has high energy density and produces no pollutants when it is converted into other types of energy. The sorption-enhanced water gas shift (SE-WGS) reaction, where the catalytic WGS reaction and byproduct CO 2 removal are carried out simultaneously in a single reactor, has received considerable attention as a novel method for high-purity hydrogen production. Since the high-purity hydrogen productivity of the SE-WGS reaction is largely dependent on the performance of the CO 2 sorbent, the development of sorbents having high CO 2 sorption capacity is crucial. Recently, a Na-Mg double salt-based sorbent has been considered for high-temperature CO 2 capture since it has been reported to have a high sorption capacity and fast sorption kinetics. In this study, the SE-WGS reaction was experimentally demonstrated using a commercial catalyst and a Na-Mg double salt-based sorbent. However, the SE-WGS reaction with a one-body hybrid solid, a physical admixture of catalyst and sorbent, showed poor reactivity and reduced CO 2 sorption uptake. As a result, a divided section packing concept was suggested as a solution. In the divided section packing method, the degree of mixing for the catalyst and sorbent in a column can be controlled by the number of sections. High-purity hydrogen (<10 ppm CO) was produced directly from the SE-WGS reaction with divided section packing, and the hydrogen productivity was further improved when the reactor column was divided into more sections and packed with more sorbent.

  14. ECTOFAUNA PARASITÁRIA DE CÃES URBANOS DOMICILIADOS ATENDIDOS EM CLÍNICAS VETERINÁRIAS PARTICULARES NA CIDADE DE LAVRAS, MG

    Directory of Open Access Journals (Sweden)

    Antonio Marcos Guimarães

    2011-03-01

    Full Text Available The objective of this study was to determine the frequency of ectoparasites in urban domiciled dogs treated at nine private veterinary clinics in the city of Lavras, Minas Gerais, Brazil. Visible and palpable ectoparasites specimens were collected manually from 67 dogs during the period of September 2004 to May 2005, kept in flasks with ethanol 70º GL and identified under a stereomicroscope. In the case of mites that cause mange, performed the analysis of the results obtained from 155 skin scrapings of the same number of dogs with clinical suspicion of parasitic dermatosis was performed, and sent to diagnostic at the Laboratory of Parasitic Diseases of Federal University of Lavras (UFLA, during the period of September 2002 to July 2007. A total of 540 ectoparasites were recorded, and four species were identified: Rhipicephalus sanguineus (60%, Ctenocephalides canis and C. felis (both 36%, and Dermatobia hominis larvae (4%. In scraped skin, positive results were verified in 12.9% (20/155, of which 80.0% with Demodex canis (16/20 and 20.0% with Sarcoptes scabiei var. canis (4/20. After ectoparasites identification a database with the dogs´medical records was made and analyzed by SPSS 12.0. It can be concluded that the predominant species of ectoparasites in dogs treated at private veterinary clinics in the city of Lavras, MG, were Ctenocephalides canis and C. felis (Siphonaptera: Pulicidae and R. sanguineus (Acari: Ixodidae and Demodex canis (Acari: Demodecidae that had a significant predominance (p<0.05 on scraped skin of young animals with suspicion of canine demodicosis.

  15. Índices de Qualidade da Água e de Estado Trófico na Represa Dr. João Penido (Juiz de Fora, MG

    Directory of Open Access Journals (Sweden)

    Magaly H. S. Bucci

    2014-01-01

    Full Text Available A represa Dr. João Penido contém o reservatório que é a principal fonte de abastecimento de água potável da cidade de Juiz de Fora, localizada na região sudeste do Brasil. Sua construção se deu em 1934 e desde então, vem sofrendo com o mau uso e ocupação das terras em seu entorno. O objetivo geral deste estudo foi caracterizar a qualidade hídrica do manancial, relacionando os resultados com o uso e ocupação do solo da bacia hidrográfica. Para isto foram realizadas análises físico-químicas e microbiológicas de amostras de água referente aos seguintes parâmetros: temperatura da água, oxigênio dissolvido, pH, turbidez, sólidos totais, demanda bioquímica de oxigênio, nitrato, fósforo total, clorofila a e coliformes termotolerantes. Os resultados obtidos foram comparados com a Resolução 357/2005 do Conselho Nacional de Meio Ambiente (CONAMA e aqueles que apresentaram desconformidade com a norma foram: oxigênio dissolvido, pH, turbidez, fósforo total e demanda bioquímica de oxigênio. Foi calculado o Índice de Qualidade da Água (IQA e o Índice de Estado Trófico (IET para as amostras analisadas. Os resultados mostraram a predominância do estado “mesotrófico” e nível “médio” de qualidade da água, indicando que as formas de uso e ocupação do solo da bacia hidrográfica têm produzido impactos negativos no ecossistema aquático. O monitoramento demonstrou ser ferramenta fundamental, proporcionando subsídios para a elaboração de um plano de gestão integrada nas ações que envolvem a preservação e recuperação da qualidade do manancial.

  16. SO DO SENSOR TM NA ESTIMATIVA DA TEMPERATURA DA SUPERFÍCIE E MUDANÇA NO USO DO SOLO EM VIÇOSA, MG, BRASIL

    Directory of Open Access Journals (Sweden)

    Rafael Coll Delgado

    2015-09-01

    Full Text Available O objetivo deste trabalho foi avaliar a dinâmica nouso e cobertura da terra em área de abrangência de Viçosa, Minas Gerais. Para tanto, utilizou-se o algoritmo SEBAL (Surface Energy Balance Algorithm for Land e o método de classificação não supervisionada por meio do algoritmo ISODATA. Foi utilizada uma série históricade temperatura do ar (ºC, da Estação Meteorológica Convencional (EMC do Instituto Nacional de Meteorologia (INMET e imagens do sensor TM Landsat 5 do Instituto Nacional de Pesquisas Espaciais (INPE, noperíodo que compreendeu 16 anos (1994-2010. Os resultados mostraram que nos anosde 1999, 2000, 2003, 2006, 2009 e 2010 mais de 20 mil hectares foram antropizadas, porém, a partir de 1999 inicia-se um acentuado crescimento das áreas classificadas como mata. Os valores demonstraram avanço das áreas antropizadas (58,92% em 1994 para 71,90% em 2010 e uma redução das áreas de pastagens (27,04% em 1994 para 5,90% em 2010. A temperatura da superfície estimada pelo algoritmo SEBAL para os anos de 1994 e 2010, apresentaram valores máximos de 38ºC em áreas antropizadas e valores mínimos de 18ºC em áreas de vegetação. Com base no cálculo do viés médio (VM, o presente estudo mostrou que os dados estimados da temperatura da superfície apresentaram boa correlação de 0,67 com os dados do INMET, já que as temperaturas foram subestimadas e superestimadas com valores mínimos e máximos de -3,83ºC e 2,65ºC em 1994 e 2003. Os resultados obtidos, ainda que em caráter preliminar, indicam a eficiência do Sensoriamento Remoto (SR por meio da análise das bandas refletivas e termal do satélite Landsat 5 como ferramenta de análise na identificação da dinâmica do uso do solo, mostrando-se eficaz quanto à espacialização dessas anomalias no espaço e no tempo.

  17. USO DO SENSOR TM NA ESTIMATIVA DA TEMPERATURA DA SUPERFÍCIE E MUDANÇA NO USO DO SOLO EM VIÇOSA, MG, BRASIL

    Directory of Open Access Journals (Sweden)

    Rafael Coll Delgado

    2013-11-01

    Full Text Available O objetivo deste trabalho foi avaliar a dinâmica nouso e cobertura da terra em área de abrangência de Viçosa, Minas Gerais. Para tanto, utilizou-se o algoritmo SEBAL (Surface Energy Balance Algorithm for Land e o método de classificação não supervisionada por meio do algoritmo ISODATA. Foi utilizada uma série históricade temperatura do ar (ºC, da Estação Meteorológica Convencional (EMC do Instituto Nacional de Meteorologia (INMET e imagens do sensor TM Landsat 5 do Instituto Nacional de Pesquisas Espaciais (INPE, noperíodo que compreendeu 16 anos (1994-2010. Os resultados mostraram que nos anosde 1999, 2000, 2003, 2006, 2009 e 2010 mais de 20 mil hectares foram antropizadas, porém, a partir de 1999 inicia-se um acentuado crescimento das áreas classificadas como mata. Os valores demonstraram avanço das áreas antropizadas (58,92% em 1994 para 71,90% em 2010 e uma redução das áreas de pastagens (27,04% em 1994 para 5,90% em 2010. A temperatura da superfície estimada pelo algoritmo SEBAL para os anos de 1994 e 2010, apresentaram valores máximos de 38ºC em áreas antropizadas e valores mínimos de 18ºC em áreas de vegetação. Com base no cálculo do viés médio (VM, o presente estudo mostrou que os dados estimados da temperatura da superfície apresentaram boa correlação de 0,67 com os dados do INMET, já que as temperaturas foram subestimadas e superestimadas com valores mínimos e máximos de -3,83ºC e 2,65ºC em 1994 e 2003. Os resultados obtidos, ainda que em caráter preliminar, indicam a eficiência do Sensoriamento Remoto (SR por meio da análise das bandas refletivas e termal do satélite Landsat 5 como ferramenta de análise na identificação da dinâmica do uso do solo, mostrando-se eficaz quanto à espacialização dessas anomalias no espaço e no tempo.

  18. Measurement of activation cross sections of the {sup 27}Al(n,α){sup 24}Na and {sup 27}Al(n,p){sup 27}Mg reactions with quasi-monoenergetic neutrons

    Energy Technology Data Exchange (ETDEWEB)

    Zaman, Muhammad; Kim, Guinyun; Kim, Kwangsoo [Kyungpook National Univ., Daegu (Korea, Republic of). Dept. of Physics; Naik, Haladhara [Kyungpook National Univ., Daegu (Korea, Republic of). Dept. of Physics; Bhabha Atomic Research Centre, Mumbai (India). Radiochemistry Div.; Lee, Young-Ouk; Cho, Young-Sik [Korea Atomic Energy Research Institute, Daejeon (Korea, Republic of). Nuclear Data Center; Lee, Man Woo; Kang, Yeong-Rok [Dongnam Institute of Radiological and Medical Science, Busan (Korea, Republic of). Research Center

    2017-10-01

    The cross sections of the {sup 27}Al(n,α){sup 24}Na and {sup 27}Al(n,p){sup 27}Mg reactions with the average neutron energies of 15.2, 26.4, and 37.2 MeV were measured using the activation and off-line γ-ray spectrometric technique at the Korean Institute of Radiological and Medical Sciences (KIRAMS), Korea. Quasi-monoenergetic neutrons produced via the {sup 9}Be(p,n) reaction with the proton beam energies of 25, 35, and 45 MeV from the MC50 cyclotron of KIRAMS were used. The present measured values were compared with those from the evaluated nuclear data libraries ENDF/B-VII, TENDL-2015, TALYS 1.8, and from literature. In general, a close agreement with the literature data as well as the evaluated data was found.

  19. Highly efficient red-emitting BaMgBO3F:Eu3+,R+ (R: Li, Na, K, Rb) phosphor for near-UV excitation synthesized via glass precursor solid-state reaction

    Science.gov (United States)

    Shinozaki, Kenji; Akai, Tomoko

    2017-09-01

    Eu3+-doped fluoroborate crystals of BaMgBO3F were synthesized by a solid-state reaction using a glassy precursor material, and their photoluminescence (PL) was investigated. To compensate for the incorporation of Eu3+ into Ba2+ sites, samples codoped with alkali ions (Li+, Na+, K+, Rb+) were also prepared. The Eu3+-doped sample showed red PL with a quantum yield (QY) of 65% caused by near-UV excitation (λ = 393 nm), and PL intensity and QY increased with the codoping of Eu3+ and alkali ions. It was found that the Eu3+,Li+-codoped sample showed the highest PL intensity and a QY of 83%.

  20. Synthesis, bioactivity and preliminary biocompatibility studies of glasses in the system CaO-MgO-SiO2-Na2O-P2O5-CaF2.

    Science.gov (United States)

    Tulyaganov, D U; Agathopoulos, S; Valerio, P; Balamurugan, A; Saranti, A; Karakassides, M A; Ferreira, J M F

    2011-02-01

    New compositions of bioactive glasses are proposed in the CaO-MgO-SiO(2)-Na(2)O-P(2)O(5)-CaF(2) system. Mineralization tests with immersion of the investigated glasses in simulated body fluid (SBF) at 37°C showed that the glasses favour the surface formation of hydroxyapatite (HA) from the early stages of the experiments. In the case of daily renewable SBF, monetite (CaHPO(4)) formation competed with the formation of HA. The influence of structural features of the glasses on their mineralization (bioactivity) performance is discussed. Preliminary in vitro experiments with osteoblasts' cell-cultures showed that the glasses are biocompatible and there is no evidence of toxicity. Sintering and devitrification studies of glass powder compacts were also performed. Glass-ceramics with attractive properties were obtained after heat treatment of the glasses at relatively low temperatures (up to 850°C).

  1. KM3NeT

    CERN Multimedia

    KM3NeT is a large scale next-generation neutrino telescope located in the deep waters of the Mediterranean Sea, optimized for the discovery of galactic neutrino sources emitting in the TeV energy region.

  2. Avaliação da tolerância e nefrotoxicidade do antimonial pentavalente administrado na dose de 40mg Sb v/kg/dia, de 12/12h, por 30 dias na forma cutaneo-mucosa de leishmaniose

    Directory of Open Access Journals (Sweden)

    Raimunda N.R. Sampaio

    1997-12-01

    Full Text Available Foi avaliada a função renal de 11 pacientes com leishmaniose cutâneo-mucosa tratados com antimonial pentavalente na dose de 40mg SbV/kg/dia aplicada de 12/12 horas, em esquema contínuo, durante trinta dias. No estudo, um paciente apresentou insuficiência renal reversível e dois desenvolveram alterações enzimáticas hepáticas e eletrocardiográficas sendo o esquema terapêutico interrompido. Nos demais pacientes observou-se efeitos nefrotóxicos tais como diminuição da taxa de filtração glomerular, diminuição da capacidade de concentração urinária, avaliada por um jejum hídrico de 16 horas e aumento na fração de excreção de sódio. No exame do sedimento urinário observou-se um aumento no número de leucócitos e cilindros. Os resultados encontrados neste estudo sugerem que o tratamento com antimonial pentavalente na dose de 40mg SbV/kg/dia foi menos tolerado em virtude de seus efeitos tóxicos, não parecendo apresentar índice de cura superior ao esquema atualmente preconizado de 20mg SbV/kg/dia.The renal function of eleven patients with mucocutaneous leishmaniasis was analyzed in a prospective study realized at the School Hospital of University of Brasília. The patients were treated with doses of 40mg/kg/day of pentavalent antimony (SbV, in a continuous scheme during thirty days. In this study three patients were excluded, one patient with reversible renal failure and two patients with hepatic and cardiac malfunctions. In the other eight patients, severe nephrotoxics effects were observed, like reduction of glomerular filtration rate, reduction of the urinary concentration capacity, evaluated by a sixteen hours hydric fasting and an increase of sodium fractional excretion. An increase in the number of leucocytes and cylinders were observed at the urinary sediment exam. Finally, the results shows that the treatment with pentavalent antimony in doses of 40mg Sb/kg/day was less tolerated on account of its renal toxics

  3. Resistência mecânica do solo à penetração na bacia hidrográfica do Riacho Fundo, Felixlândia-MG

    Directory of Open Access Journals (Sweden)

    Ana Paula Vilela Carvalho

    2012-12-01

    Full Text Available A compactação do solo devido ao tráfego de máquinas utilizadas no setor florestal causa modificações estruturais deste, podendo assim interferir na densidade do solo, velocidade e capacidade de infiltração de água e no desenvolvimento radicular das culturas. Objetivou-se, neste trabalho avaliar a resistência mecânica do solo à penetração na Bacia Hidrográfica do Riacho Fundo, Felixlândia-MG em área de uma empresa do setor florestal localizada no cerrado mineiro. Os testes de resistência à penetração foram realizados em fevereiro de 2011, em seis parcelas com plantios de eucalipto localizadas nos talhões 35, 36, 39, 40, 42 e 44, utilizando-se um penetrômetro de impacto. Os talhões apresentaram valores médios da resistência mecânica do solo acima de 4 MPa e esses altos valores podem estar associados ao uso do solo que antes dos plantios de eucalipto era pastagem e também devido a condição de baixo teor de umidade do solo no período em que foi realizada a determinação da resistência mecânica do solo.

  4. Os efeitos do laser hélio-neônio de baixa intensidade na cicatrização de lesões cutâneas induzidas em ratos Effects of low-level helium-neon laser on induced wound healing in rats

    Directory of Open Access Journals (Sweden)

    Viviane L. Busnardo

    2010-02-01

    Full Text Available OBJETIVO: Avaliar os efeitos do laser de baixa potência hélio e neônio (HeNe na cicatrização de feridas cutâneas de ratos. MÉTODOS: Sessenta ratos Wistar foram divididos em grupos controle e experimento. Utilizou-se ferida incisional, longitudinal, dorso-mediana, suturada com pontos separados simples. No grupo experimento, as feridas foram irradiadas diariamente com aparelho de laser de HeNe com potência contínua máxima de 5mW, comprimento de onda de 632,8 nm, visível com densidade de energia de 4J/cm², área de raio do laser de 0,015cm², durante 36 segundos, em três pontos da lesão. As feridas foram avaliadas no 3º, no 7º e no 14º dia de pós-operatório. Cortes histológicos foram corados com hematoxilina-eosina (H&E e avaliados segundo protocolo de Vizzotto et al. (2003* para identificar o tipo de reação inflamatória e com Picrosirius para identificar os colágenos I e III e o índice de maturidade da cicatriz (IMaC. Utilizou-se imunoistoquímica com anti-CD45-LCA para o reconhecimento das células inflamatórias. RESULTADOS: Ambos os grupos mostraram o mesmo padrão inflamatório. No grupo experimento, observaram-se menos células inflamatórias nos três tempos estudados (pOBJECTIVE: To evaluate the effects of low-level helium-neon (HeNe laser on cutaneous wound healing in rats. METHODS: Sixty Wistar rats were divided into control group and experimental group. A sutured longitudinal, dorsal-medial incision was made, with simple separate stitches. The experimental group was irradiated daily in three areas of the wound with HeNe laser (5mW maximum continuous power, 632.8 nm wavelength, 4 J/cm² energy density and 0.015 cm² laser beam area for 36 seconds. The areas were evaluated on the third, seventh and fourteenth days postoperative. Histological sections were stained with hematoxylin-eosin to determine the type of inflammatory reaction according to the protocol by Vizzotto et al. (2003* and with Picrosirius to identify

  5. Optimization of internal monitoring methodology of {sup 18}F in the form of {sup 18}FDG at the CRCN-NE, Recife, Pernambuco, Brazil; Otimizacao da metodologia de monitoracao interna de {sup 18}F na forma de {sup 18}FDG no CRCN-NE

    Energy Technology Data Exchange (ETDEWEB)

    Lacerda, Isabelle V.B.; Xavier, Aline C.S.; Lima, Fabiana F.; Oliveira, Mercia L., E-mail: fflima@cnen.gov.b, E-mail: mercial@cnen.gov.b, E-mail: falima@cnen.gov.b [Centro Regional de Ciencias Nucleares do Nordeste (CRCN-NE/CNEN-PE), Recife, PE (Brazil); Oliveira, Cassio M., E-mail: cmo@cdtn.b [Universidade Federal de Minas Gerais (UFMG), Belo Horizonte, MG (Brazil); Silva, Tania V. da; Alonso, Thessa C.; Silva, Teogenes A. da, E-mail: silvatv@cdtn.b, E-mail: alonso@cdtn.b, E-mail: silvata@cdtn.b [Centro de Desenvolvimento da Tecnologia Nuclear (CDTN/CNEN), Belo Horizonte, MG (Brazil)

    2011-07-01

    The work aims to optimize and improve the efficiency of the internal monitoring technique developed at Centro Regional de Ciencias Nucleares do Nordeste for F-18 in form of F-18DG radiopharmaceuticals. It was performed two assays for the methodology developed. The first was performed in a makeshift room, while the second was performed in a room with walls reinforced with concrete. The detection system was a NaI (Tl) 3{sup x} 3{sup s}cintillation detector, coupled with the software Genie 2000. In order to obtain the calibration factor, a brain phantom containing {sup 22}Na liquid source was measured. The interpretation of the bioassay data was performed using the biokinetic models provided by the ICRP 53 and edited by software AIDE-version 6, which gives the fraction of activity retained in the organs as a function of time. The sensitivities of detection were similar, resulting in a minimum detectable dose below 1 mSv, as recommended by the IAEA. (author)

  6. A Low-Li Geochemical Province in the NE Atlantic

    DEFF Research Database (Denmark)

    Bailey, J. C.; Gwozdz, R.

    1978-01-01

    Lithium was analysed in 392 basalts and related igneous rocks from the North Atlantic Tertiary-Recent province using activation analysis and Čerenkov counting. Monotonous Li values of 5.5±2 ppm in NE Atlantic basalts define a low-Li geochemical province which has persisted for 60 million years...... basalt series. No whole-rock coherence is observed between Li and Mg, K, Rb or Ca. Mantle phlogopite is considered to play an insignificant rôle in controlling the Li levels of NE Atlantic basalts....

  7. Na, Mg, Ni and Cs distribution and speciation after long-term alteration of a simulated nuclear waste glass: A micro-XAS/XRF/XRD and wet chemical study

    Science.gov (United States)

    Curti, Enzo; Dähn, Rainer; Farges, François; Vespa, Marika

    2009-04-01

    Microscopic distribution and speciation of Na, Mg, Ni and Cs in a simulated (inactive) nuclear waste glass were studied using micro X-ray fluorescence (μ-XRF) and micro X-ray absorption spectroscopy (μ-XAS), after aqueous leaching during 12 years at 90 °C. Na and Mg are major constituents of the glass that can be used to determine the progress of the glass corrosion process and the nature of secondary alteration phases. Ni and Cs represent dose determining long-lived radionuclides ( 59Ni, 135Cs) in vitrified nuclear waste. The Na-Mg μ-XRF maps revealed that the core regions of the glass fragments are apparently unaltered and compositionally homogeneous, whereas rims and interstitial spaces are enriched with Mg-rich smectite formed during the leaching process. The micro X-ray absorption near edge structure (μ-XANES) spectra collected at the Mg K-edge in the altered zones show three sharp resonances typical for crystalline Mg-silicates. These resonances are distinctive of Mg occupying undistorted octahedral positions. In contrast, the μ-XANES spectra collected in the core zones of the glass fragments lack this resonance pattern and are identical to the spectra measured on the pristine (unleached) MW glass. Micro extended X-ray absorption fine structure (μ-EXAFS) and μ-XANES analyses at the Ni K-edge revealed three distinct Ni(II) species: (a) Ni uniformly distributed in the glass matrix, (b) micro-inclusions with high Ni concentrations and (c) Ni associated to the Mg-clay. The comparison with reference spectra of unleached MW and other Ni-bearing silicate glasses indicated that species (a) represents the original coordinative environment of Ni in the glass. The μ-EXAFS analyses revealed that species (b) is structural Ni in trevorite (NiFe 2O 4), which probably formed through unmixing processes during the cooling of the glass melt. The μ-EXAFS of species (c) could be successfully modeled assuming specific adsorption or incorporation of Ni into the lattice of

  8. Ion exchange reactions of major inorganic cations (H+, Na+, Ca2+, Mg2+ and K+) on beidellite: Experimental results and new thermodynamic database. Toward a better prediction of contaminant mobility in natural environments

    International Nuclear Information System (INIS)

    Robin, Valentin; Tertre, Emmanuel; Beaufort, Daniel; Regnault, Olivier; Sardini, Paul; Descostes, Michael

    2015-01-01

    Highlights: • Multi-site ion exchange model for beidellite for Na + , Ca 2+ , Mg 2+ , K + and H + . • Validity over the 1–7 pH range and total normality >5 × 10 −3 mol/L. • Application to equilibrium between smectite and acidic solution from mining sites. • Impact of crystal chemistry of smectites on their sorption properties. - Abstract: To our knowledge, no thermodynamic database is available in the literature concerning ion-exchange reactions occurring in low-charge smectite with tetrahedral charge (beidellite). The lack of this information makes it difficult to predict the mobility of contaminants in environments where beidellite and major cations, which act as competitors with contaminants for sorption on the clay phase, are present. The present study proposes a multi-site ion exchange model able to describe experimental data obtained for H + and the four major cations (Na + , Ca 2+ , Mg 2+ and K + ) found in natural waters interacting with a <0.3 μm size fraction of Na-beidellite. The nature of the sites involved in the sorption processes is assessed using qualitative structural data. Moreover, the effect of the charge location in the smectite on the selectivity coefficient values is discussed by comparison with the results reported in the literature for smectite characterized by octahedral charge (montmorillonite). The new thermodynamic database proposed in this study is based on the same total sorption site density and distribution of sites regardless of the cations investigated. This database is valid for a large range of physico-chemical conditions: a [1–7] pH range, a total normality higher than 5 × 10 −3 mol/L corresponding to a flocculated state for water/clay systems, and when sorption of ions pairs can be neglected. Note that this study provides evidence that a thermodynamic database describing ion exchange reactions between H + and the four major cations of natural water for smectite cannot be valid irrespective of the total

  9. Observation of pH Value in Electrokinetic Remediation using various electrolyte (MgSO4, KH2PO4 and Na(NO3)) for Barren Acidic Soil at Ayer Hitam, Johor, Malaysia

    Science.gov (United States)

    Norashira, J.; Zaidi, E.; Aziman, M.; Saiful Azhar, A. T.

    2016-07-01

    Barren acidic soil collected at Ayer Hitam, Johor Malaysia was recorded at pH value of 2.36 with relative humidity of 86%. This pH value is not suitable for the growth of any plants especially for the soil stabilization purposes. Gradation weathering within the range of 4 to 6 indicates an incomplete/partial weathering process. The soil grade in this range is known as a black shale mudstone. Beside, this also influences to a factor of the high surface water runoff at this particular soil species. As the acidic pH become a major problem for soil fertilizing hence an appropriate technique was implemented known as using ‘Electrokinetic Remediation’, EKR. This technique has a great potential in changing the soil pH value from acidic to less acidic and also kept maintain the pH at the saturated rate of electrochemical process. This research study presents the monitoring data of pH value due to the effect of various electrolyte consist of 0.5M of MgSO4, KH2PO4, and Na(NO3). Here, the distilled water (DW) was used as reference solution. The electric field was provided by dipping two pieces of identical rectangular aluminum foil as anode and cathode. The EKR was conducted under a constant voltage gradient of 50 V/m across the sample bulk at 0.14 m length measured between both electrodes. The data collection was conducted during the total period of 7 days surveillance. The variation of pH values at the remediation area between anode and cathode for various type of electrolyte indicates that there are a significant saturated value as it reaches 7 days of treatment. During the analysis, it is found that the highest pH value at the remediation area after 7 days treatment using Na(NO3), KH2PO4 and MgSO4 was 3.93, 3.33 and 3.39 respectively. Hence from the last stage of pH value observation, it can be conclude that the best electrolyte for barren soil treatment is Na(NO3) whereby it contribute to highest pH value and turn the soil to be less acidic.

  10. Avaliação quantitativa da sustentabilidade estrutural de um latossolo vermelho-amarelo cultivado com eucalipto na região de Peçanha-MG

    Directory of Open Access Journals (Sweden)

    Dias Junior Moacir de Souza

    2003-01-01

    Full Text Available Uma das limitações para que o desenvolvimento florestal sustentável seja atingido está relacionado com a questão do tráfego durante a realização das operações de colheita e transporte de madeira, pois elas podem causar degradação da estrutura do solo. Visando obter uma solução para este problema, os objetivos deste estudo foram: a propor um modelo de sustentabilidade da estrutura dos solos cultivados com Eucalyptus spp., na região de Peçanha-MG, em função da pressão de preconsolidação (sigmap e da umidade (U; e b determinar, através do uso deste modelo, a influência das operações realizadas com o Feller-Büncher e Skidder (Pneu 30.5L.32, Feller-Büncher e Skidder (Pneu 66.43.00.26 e Harvester e Forwarder na estrutura do solo. Este estudo foi conduzido em um Latossolo Vermelho-Amarelo (LV, sob Eucalyptus, utilizando amostras indeformadas, coletadas antes e após as operações da colheita, na profundidade de 0,10 a 0,125 m. As amostras indeformadas foram utilizadas nos ensaios de compressão uniaxial. Foram determinadas também a textura e a densidade de partículas do solo. O modelo de sustentabilidade da estrutura do Latossolo Vermelho-Amarelo obtido para os projetos deste estudo é expresso pela seguinte equação: sigmap = 10(2,72-1,29 U. O uso dos modelos de sustentabilidade da estrutura e da pressão de preconsolidação, determinada após o tráfego, permitiu quantificar os efeitos causados pelo Feller-Büncher e Skidder (Pneu 30.5L.32, Feller-Büncher e Skidder (Pneu 66.43.00.26 e Harvester e Forwarder na estrutura do Latossolo Vermelho-Amarelo. Nos projetos Buriti e São Leonardo, as operações realizadas com o Harvester e Forwarder foram as que mais degradaram a estrutura do solo, enquanto no projeto Dourado foram as realizadas com o Feller-Büncher e Skidder (Pneu 30.5L.32 e Feller-Büncher e Skidder (Pneu 66.43.00.26.

  11. Tendências recentes nos elementos do clima e suas implicações na evapotranspiração da cultura do milho em Viçosa - MG Recent trends in the weather elements and its implications in the maize crop evapotranspiration in Viçosa-MG, Brazil

    Directory of Open Access Journals (Sweden)

    Leonidas P. de Alencar

    2011-01-01

    Full Text Available A mudança nas condições climáticas tem gerado grandes preocupações em nível mundial, sendo que uma das grandes questões, neste contexto, é o aquecimento global. As alterações ocorridas nas condições climáticas podem afetar a demanda de água das plantas, porque a evapotranspiração é afetada por mudanças nos elementos climáticos. O objetivo deste trabalho foi analisar os efeitos das possíveis mudanças dos elementos do clima na evapotranspiração de referência e na evapotranspiração da cultura do milho para a região de Viçosa - MG. Mediante análise de tendência pelo teste de Mann-Kendall e da estatística do teste t da regressão linear, verificou-se o comportamento dos seguintes elementos climáticos: temperaturas máxima e mínima, insolação, velocidade do vento e umidade relativa. Observou-se uma redução na evapotranspiração de referência e da cultura do milho ao longo dos últimos 41 anos, principalmente em razão da redução da insolação e da velocidade do vento. A evapotranspiração de referência apresentou redução da ordem de 4,2 mm por ano.The change in weather conditions has caused great concern in the world and the major issue, in this context, is the global warming. The changes in climate may affect the water demand of plants, because the evapotranspiration is affected by changes in climatic elements. The objective of this study was to examine the possible effects of climatological changes in evapotranspiration and reference evapotranspiration of corn in Viçosa - MG, Brazil. Trend analysis by the Mann-Kendall statistic and student t test of the linear regression were used to study the behavior of the following weather elements: maximum and minimum temperatures, sunshine duration, wind speed and relative humidity. It was observed a reduction in the reference evapotranspiration and maize crop evapotranspiration over the recent past 41 years, mainly because of reduced solar radiation and wind

  12. Teorija slovenske ulične poezije in družbeni kontekst

    OpenAIRE

    Kusterle, Jernej

    2017-01-01

    Magistrsko delo obravnava ulično poezijo, ki je dolgo časa asociirala zgolj z glasbeno umetnostjo, in je javnosti bolj znana pod zvrstnim imenom rap. Delo najprej utemelji rabo besedne zveze ulična poezija znotraj literarne vede, pri čemer izhaja iz razvezane kratične oblike "rap" ter pomena obeh sestavin besedne zveze "ulična poezija". Hkrati pojasni razliko med ulično, poulično in urbano poezijo ter uvede novost v teorijo ulične poezije, tj. delitev na ožjo in širšo opredelitev raziskovaneg...

  13. NE2561 and NE2611A - are they different?

    International Nuclear Information System (INIS)

    Huntley, R.; Boas, J.; Kotler, L.; Webb, D.; Stucki, G.

    2000-01-01

    Full text: Evidence is mounting that the nominally identical ionization chamber types NE2561 and NE2611A have significantly different energy dependences. This is revealed by comparing the radiation quality correction factors k q . The factor k q is the ratio of the absorbed dose to water calibration factors (for a particular type of ionization chamber) at radiation quality Q to that for 60 Co. k q values for NE2561 and NE2611A chambers have been compared for various kV and MV X-ray beams at several standards laboratories. Measurements at ARPANSA (Australia) on six NE2561 and five NE2611A show a consistent difference in k q of 1-2% for 16 and 19 MV X-rays. Work at OFMET (Switzerland) has shown similar differences at 6 and 18 MV. No such differences are seen at NPL (UK) - this inconsistency is currently ascribed to differences in the radiation beams. Consistent differences of up to 3% between these two chamber types have been observed at both ARPANSA and NRC (Canada) at the BIPM medium energy X-ray intercomparison qualities between 50 kV and 250 kV. We conclude that the two types of chamber should not be regarded as identical. ARPANSA and several other laboratories in Europe and North America will shortly participate in a Euromet project to be coordinated by OFMET, to investigate high energy X-ray beam quality specifiers. This project will provide additional data that may lead to a better understanding of this anomaly. Copyright (2000) Australasian College of Physical Scientists and Engineers in Medicine

  14. Physics at DAΦNE

    International Nuclear Information System (INIS)

    Franzini, P.J.

    1995-01-01

    In this talk, I will give a brief description of the φ factory DAΦNE at Frascati, explaining why a φ factory is an interesting place to do new physics, and then discuss the physics that can be done at DAΦNE. I will concentrate on CP violation as it can be studied at DAΦNE. This is, after all, the raison d'etre of DAΦNE. I start with a brief general introduction to CP violation in the KK system, and the distinction between mass-mixing CP violation (ε) and intrinsic CP violation (ε'/ε). After presenting a summary of ε'/ε measurements up to now, and briefly discussing the theory of ε'/ε (the so-called 'penguins'), I will cover the particularities of measuring ε'/ε at a φ factory, such as tagging and interferometry. Finally, I will say a few words about searching for CP violation in modes where it has never before been seen. I will end my talk with a list of other physics topics at DAΦNE, and rare decay branching ratio limits that can be achieved there, just to give a flavor of what else can be done. (author) 8 figs., 2 tabs., 22 refs

  15. Influência da adição de íons Ca++ e Mg++ na dureza de géis de concentrado proteíco de soro de leite bovino Influence of the addition of Ca++ and Mg++ ions on the hardness of whey protein concentrate gels

    Directory of Open Access Journals (Sweden)

    Márcia de Mello Luvielmo

    2002-08-01

    Full Text Available Inúmeros estudos vêm sendo realizados com o objetivo de compreender o comportamento das proteínas do Concentrado Protéico de Soro (CPS. A capacidade destas proteínas em formar géis estáveis a temperaturas entre 70ºC e 90ºC, é uma propriedade funcional importante para a confecção de vários produtos alimentícios, tais como: produtos de padaria, cárneos, texturizados e lácteos. A concentração protéica, pH, composição iônica e temperatura podem ser controladas para obter um gel com as características desejadas. Neste trabalho foi investigado o efeito dos íons metálicos bivalentes Ca++ e Mg++, na propriedade de dureza de géis de CPS induzidos termicamente. Dispersões protéicas a 6; 7 e 8% de proteína do CPS a pH 6,3 com 0; 7,5; 15; 30 e 75mm de CaCl2 ou MgCl2 foram aquecidas a 75ºC por 45 min, resfriadas a 4ºC por 12 horas, e os géis avaliados em um texturômetro TA-XT2. Os géis formados com maiores concentrações do sal adicionado obtiveram maiores valores de dureza na faixa estudada. Nas concentrações de 15 a 75mM os valores de dureza dos géis com a adição de CaCl2 foram significativamente maiores (pSeveral studies have been carried out to understand the behaviour of whey protein concentrates (WPC. One of the most important properties of this functional ingredient is the capacity to form stable gels in the temperature range from 70 to 90ºC, which makes it a convenient component of many foods such as bakery, meat, texturized and milk products. Protein concentration, pH, ionic composition and temperature must be kept under control in order to form products with desirable characteristics. The aim of this work was to investigate the influence of metallic divalent ions, Ca++ and Mg++, on the hardness of thermally induced WPC gels. Dispersions of WPC at 6, 7 and 8% protein, at pH 6.3 containing 0, 7, 15, 30 and 75mM CaCl2 or MgCl2 were heated at 75ºC for 45 min, followed by cooling at 4ºC for 12 hours. The gels

  16. Theoretical descriptions of novel triplet germylenes M1-Ge-M2-M3 (M1 = H, Li, Na, K; M2 = Be, Mg, Ca; M3 = H, F, Cl, Br).

    Science.gov (United States)

    Kassaee, Mohamad Zaman; Ashenagar, Samaneh

    2018-02-06

    In a quest to identify new ground-state triplet germylenes, the stabilities (singlet-triplet energy differences, ΔE S-T ) of 96 singlet (s) and triplet (t) M 1 -Ge-M 2 -M 3 species were compared and contrasted at the B3LYP/6-311++G**, QCISD(T)/6-311++G**, and CCSD(T)/6-311++G** levels of theory (M 1  = H, Li, Na, K; M 2  = Be, Mg, Ca; M 3  = H, F, Cl, Br). Interestingly, F-substituent triplet germylenes (M 3  = F) appear to be more stable and linear than the corresponding Cl- or Br-substituent triplet germylenes (M 3  = Cl or Br). Triplets with M 1  = K (i.e., the K-Ge-M 2 -M 3 series) seem to be more stable than the corresponding triplets with M 1  = H, Li, or Na. This can be attributed to the higher electropositivity of potassium. Triplet species with M 3  = Cl behave similarly to those with M 3  = Br. Conversely, triplets with M 3  = H show similar stabilities and linearities to those with M 3  = F. Singlet species of formulae K-Ge-Ca-Cl and K-Ge-Ca-Br form unexpected cyclic structures. Finally, the triplet germylenes M 1 -Ge-M 2 -M 3 become more stable as the electropositivities of the α-substituents (M 1 and M 2 ) and the electronegativity of the β-substituent (M 3 ) increase.

  17. Efeitos de fertilização na biomassa e qualidade nutricional do zooplâncton utilizado para alimentação de alevinos na estação de hidrobiologia e piscicultura de Furnas, MG Fertilization effects on biomass and nutritional quality of zooplancton in feeding of fry in the Furnas (MG, Brazil hydrobiology and pisciculture station

    Directory of Open Access Journals (Sweden)

    Raquel Magalhães Santeiro

    2000-05-01

    Full Text Available O estudo objetivou avaliar os efeitos da adição intensiva de dejetos orgânicos e de nutrientes na qualidade do zooplâncton obtido em tanques de plâncton, empregado na alimentação de alevinos de “trairão” (Hoplias lacerdae. Os teores de lipídeos totais do zooplâncton bem como sua abundância e biomassa foram acompanhados, através de duas coletas semanais, em dois tanques de produção de plâncton durante dois meses seguidos. Foram medidos ainda a temperatura, pH, oxigênio dissolvido, condutividade elétrica na coluna de água. As concentrações de clorofila-a, fósforo total, amônia e nitrogênio total (TKN foram acompanhadas semanalmente. Nos primeiros trinta dias, foi feita a adubação a cada cinco dias e, nos últimos trinta dias, não houve qualquer adubação em ambos os tanques. A interrupção da fertilização causou uma notável e rápida mudança na qualidade físico-química da água bem como na estrutura da comunidade zooplanctônica. Houve um decréscimo nos teores de condutividade, amônia, nitrogênio total, fósforo total e clorofila-a. Em contraste, houve um aumento nos níveis de oxigênio dissolvido e pH. Logo após a parada da fertilização, houve um pico na biomassa total do zooplâncton que perdurou por cerca de 20 dias, em ambos os tanques. Nesse período, o cladócero Moina reticulata e o rotífero Brachionus calyciflorus foram os mais abundantes. No entanto, ao final do período de estudos, os ciclopóides voltaram a ser os organismos dominantes, embora com predominância de formas imaturas. Os teores de lipídeos totais do zooplâncton permaneceram baixos durante todo o período de estudos (6-10%, sugerindo a má qualidade do seu alimento dentro dos tanques. O estudo demonstra que a fertilização é necessária para que seja obtido um zooplâncton com maiores valores nutricionais mas a baixa qualidade da água causada pela hipereutrofização e os baixos níveis de lipídeos encontrados no zoopl

  18. GEODETSKE MERITVE IN ČASOVNO PLANIRANJE MONITORINGA PRI GRADNJI GARAŽNE HIŠE

    OpenAIRE

    Žižek, Marko

    2011-01-01

    Diplomska naloga pokriva problematiko geodetskih kontrolnih meritev (monitoringa) med gradnjo. Glavni cilj diplomske naloge je prikazati metode monitoringa in različne metode geodetskega merjenja. Podrobno sta opisani merski metodi niveliranja in tahimetrije, kot tudi instrumenti, ki jih uporabljamo. Predstavljena je metoda niveliranja na konkretnem primeru in sicer gra za objekt garažne hiše v centru mesta Maribor. V nalogi je tudi predstavljen terminski plan samih meritev. Plan je prikazan ...

  19. Sistematização da Assistência de Enfermagem na Rede Hospitalar de Uberaba: MG Sistematización de la asistencia de enfermería en la Red Hospitalaria de Uberaba: MG Systematization of Nursing Care in the Uberaba: MG hospital network

    Directory of Open Access Journals (Sweden)

    Karoline Faria de Oliveira

    2012-12-01

    Full Text Available O planeamento da assistência de enfermagem tem como finalidade a organização do cuidado a partir de um método sistemático, sendo o enfermeiro o responsável pelo seu desenvolvimento. Objetivos: verificar o conhecimento dos enfermeiros sobre a Sistematização da Assistência de Enfermagem (SAE na rede hospitalar de Uberaba e implantar a SAE num hospital privado do município. Método: estudo descritivo, exploratório e de intervenção. Primeira etapa: enfermeiros responderam um questionário semi-estruturado sobre as suas percepções em relação à SAE. Segunda etapa: implantação da SAE em hospital privado. Resultados: a maioria dos enfermeiros tinha incentivo institucional para implantação da SAE (60,29% e referia conhecê-la desde a graduação (91,18%, revelando desconexão entre o conhecimento da SAE adquirido na graduação e a prática profissional dos enfermeiros. Obstáculos para o uso da SAE: dificuldade na realização do exame físico (47,06%, do diagnóstico de enfermagem (36,76% e o acesso aos cursos de capacitação (85,71%. A implantação da SAE ocorreu no Centro de Terapia Intensiva (CTI de um hospital privado do município. Foram identificados os diagnósticos de enfermagem mais freqüentes na UTI, originando um documento impresso que passou a compor o prontuário dos pacientes. No verso deste documento constavam as prescrições de enfermagem, que após implementadas foram verificadas.La finalidad del planeamiento de la asistencia de enfermería es el organizar el cuidado a partir de un método sistemático. Objetivos: describir la percepción de los enfermeros sobre la Sistematización de la Asistencia de Enfermería (SAE en la red hospitalaria de Uberaba y la implantación de la SAE en un hospital privado. Método: estudio descriptivo, exploratorio y de intervención. Primer paso: los enfermeros respondieron a un cuestionario semiestruturado sobre sus percepciones con respecto a la SAE. Segundo paso: implantaci

  20. ESTUDO DA CORRELAÇÃO DOS TEORES DE P, K, Al, Ca e Mg NO SOLO, COM A ALTURA DE BANANEIRAS DO CULTIVAR “MARMELO”, NA EMISSÃO DO CACHO P, K, Al, Ca, AND Mg SOIL CORRELATION STUDY WITH BANANA PLANT HEIGHT CULTIVAR "MARMELO" IN THE BUNCH EMISSION

    Directory of Open Access Journals (Sweden)

    Manoel Passos de Castro

    2007-09-01

    Full Text Available

    A bananeira do cultivar “Marmelo” vem, a cada dia, sendo a melhor opção para os bananicultores, que fornecem frutas às fábricas de doces. Com o aumento dos plantios deste cultivar, necessitou-se de dados concretos, na indicação de glebas, para a formação de bananais, tomando como base a análise do solo. Para isto tomaram-se 40 amostras, constituídas cada uma de 12 sub-amostras, ao redor de 40 touceiras de bananas. Estas touceiras foram escolhidas ao acaso, em um bananal de 2,5 ha, plantado no espaçamento de 3m x 3m, com idade de três anos. Para cada amostra analisaram-se os teores de P, K, Ca + Mg e Al, sendo estes correlacionados com a altura da bananeira correspondente, na emissão da inflorescência. Com base nas análises estatísticas concluiu-se que: a. Em caso de não se indicar adubação, o plantio só deve ser efetuado em solos com mais de 50 ppm. de K; b. A indicação de adubos fosfatados deverá ser feita apenas quando o teor de P no solo for menor que 1 ppm; c. O teor de Ca + Mg do solo deverá ser elevado para 2 (dois mE/100 ml, utilizando-se calcário dolomítico; d. O alumínio tóxico do solo deve ser totalmente neutralizado.

    For commercial banana production, flat fersain is preferable because farm implements and heavy machinery can move early in the fields, but in Goiás, flat land is generally of very low fertility. This study was undertaken to determine the growth of the “Marmelo” banana in this kind of poor soil, using correlations between analyses of soils and the heights of pseudo stems at flowering, and to suggest viable fertilization for its successful growth.

  1. Structural and electrical properties of (1-x)(Na1/2Bi1/2)TiO3-xPb(Mg1/3Nb2/3)O3 solid solution

    International Nuclear Information System (INIS)

    Lee, J.-K.; Yi, J.Y.; Hong, K.S.

    2004-01-01

    Structural, dielectric and piezoelectric properties of (1-x)(Na 1/2 Bi 1/2 )TiO 3 -xPb(Mg 1/3 Nb 2/3 )O 3 (NBT-xPMN) solid solution have been investigated. An addition of PMN into NBT transformed the structure of sintered samples from rhombohedral to pseudocubic phase where x is larger than 0.1. In calcined powders, however, the intermediate structure were observed between rhombohedral and cubic phases near x=0.1. The formation of solid solution between NBT and PMN modified the dielectric and piezoelectric properties of NBT to be suitable for high temperature dielectric and piezoelectric material. With increasing the content of PMN, the temperature-stability of ε r (T) increased and the high temperature dielectric loss decreased. In addition, the piezoelectric property of NBT-xPMN was enhanced, for the decrease of coercive field and conductivity promoted the domain reversal under the high electric field of the poling process

  2. Effect of Al2Cu precipitates size and mass transport on the polarisation behaviour of age-hardened Al-Si-Cu-Mg alloys in 0.05 M NaCl

    International Nuclear Information System (INIS)

    Vieira, A.C.; Pinto, A.M.; Rocha, L.A.; Mischler, S.

    2011-01-01

    Research highlights: → Influence of the size distribution of Al-Cu phases on the electrochemical behaviour of well defined alloys under controlled mass transport conditions (RDE). → Oxygen reduction occurs only the Al 2 Cu phases. → Thinner Al-Cu grains the oxygen reduction current deviates at high rotation rates from the Levich behaviour. - Abstract: The electrochemical behaviour of age-hardened Al-Si-Cu-Mg alloys was investigated in a 0.05 M NaCl solution under controlled mass transport conditions using a rotating disk electrode. This work aimed at getting better understanding of the effect of the alloy microstructure, in particular the size distribution of Al 2 Cu phase, on the corrosion behaviour of the alloy. Three different size distributions of the Al 2 Cu phase were obtained through appropriate heat treatments. The cathodic reduction of oxygen was found to occur mainly on the Al 2 Cu phases acting as preferential cathodes. Small sized Al 2 Cu phases were found to promote at high rotation rates a transition from a 4 electron to a 2 electron dominated oxygen reduction mechanisms.

  3. Ab initio study of the structure and stability of carbonates, silicates, nitrates, phosphates, borates and aluminates L2AO3 and MAO3 (L=Li, Na; M=Be, Mg; A=C, Si, N+, P+, B-, Al-)

    International Nuclear Information System (INIS)

    Charkin, D.O.; Makku, M.L.; Charkin, O.P

    1998-01-01

    Nonempiric calculations of potential energy surfaces of molecules and ions of lithium and sodium oxosalts of the L 2 AO 3 type and beryllium and magnesium salts of the MAO 3 type with 24 valent electrons (L=Li, Na; M=Be, Mg; A=C, Si, N + , P + , B - , Al - ) are accomplished within the frames of the MP2/6-31G * +ZPE(HF/6-31G * ) and MP4SDTQ/6-31+G * //MP2/6-31G * +ZPE(MP2/6-31G * )approximations. Equilibriumgeometrical parameters and relative energy of isomers and energy of their decomposition, IR-frequencies and intensities of normal oscillations are determined; trends in their change in various series of molecules and ions are analyzed. Deformation and polarization of the AO 3 trigonal oxoanions under the effect of alkali and alkaline-earth cations, ortho-meta-isomerism in negative ions of the MBO 3 - borates and MACO 3 - aluminates, as well as effect of electron correlation on calculation results are determined. The results are compared with the data of previous calculations of isoelectron lithium and sodium salts LAO 3

  4. Educação infantil no período militar: nuances políticas de sua implantação na Escola Estadual João Pinheiro (Ituiutaba, MG, 1964 a 1985

    Directory of Open Access Journals (Sweden)

    Carlos Henrique de Carvalho

    2014-08-01

    Full Text Available Este artigo tem por propósito apresentar e discutir a base legal que possibilitou a implantação da educação infantil no Brasil, durante o período de vigência da Ditadura Civil Militar no País (1964 a 1985. Mas para proceder tal estudo examinamos como foi esse processo de instauração da educação infantil na Escola Estadual João Pinheiro, no município de Ituiutaba (MG. Por outro lado, também é nosso objetivo discorrer sobre algumas das práticas pedagógicas desenvolvidas nas primeiras séries dessa modalidade de ensino, procurando situá-las no âmbito do comportamento social já determinado pelo próprio contexto educacional vigente à época, ou seja, configurado a partir das diretrizes política-institucionais instauradas pelo Estado Militar.

  5. ISORROPIA II: a computationally efficient thermodynamic equilibrium model for K+─Ca²+─Mg²+─NH4+─Na+─SO4²-─NO3-─Cl-─H2O aerosols

    Directory of Open Access Journals (Sweden)

    C. Fountoukis

    2007-09-01

    Full Text Available This study presents ISORROPIA II, a thermodynamic equilibrium model for the K+–Ca2+–Mg2+–NH4+–Na+–SO42−–NO3−–Cl−–H2O aerosol system. A comprehensive evaluation of its performance is conducted against water uptake measurements for laboratory aerosol and predictions of the SCAPE2 thermodynamic module over a wide range of atmospherically relevant conditions. The two models agree well, to within 13% for aerosol water content and total PM mass, 16% for aerosol nitrate and 6% for aerosol chloride and ammonium. Largest discrepancies were found under conditions of low RH, primarily from differences in the treatment of water uptake and solid state composition. In terms of computational speed, ISORROPIA II was more than an order of magnitude faster than SCAPE2, with robust and rapid convergence under all conditions. The addition of crustal species does not slow down the thermodynamic calculations (compared to the older ISORROPIA code because of optimizations in the activity coefficient calculation algorithm. Based on its computational rigor and performance, ISORROPIA II appears to be a highly attractive alternative for use in large scale air quality and atmospheric transport models.

  6. Theoretical investigation of geometric structure and relative stability of classical and bridge structures in Hk-1ASiH2+, Hk-1ASiH2 system (A=Li, Na, Be, Mg, B, Al)

    International Nuclear Information System (INIS)

    Zyubin, A.S.; Zyubina, T.S.; Charkin, O.P.; Shlojfer, P.R.

    1990-01-01

    The influence of acceptor properties and structure of L + cation in the series L=Li, B, BeH, BH 2 and Na, Al, MgH, AlH 2 on relative stabilities of classical and bridge isomers in systems L + SiH 2 and LSiH 3 , in which L + cation interacts either with unshared pair Si(L + SiH 2 , LSiH 3 ) or with hydrogen atom (SiH 2 L + , SiH 3 L), have been investigated. Geometric parameters of alternative structures were determined at the level of SCF/3-211*, their relative stabilities were refined in the framework of MP3/6-311*. It is found that in LSiH 2 + ions bridge isomers are less stable than the classical ones, and when acceptor abilities of L + increase, the energy difference between them also increases. In systems LSiH 3 the regularities proved to be more complex and they are determined both by L + acceptor properties and its structure. Reasons for those regularities are discussed

  7. Aspectos climáticos da bacia hidrográfica do rio Preto – MG/RJ, Brasil, influência dos fatores geográficos na formação desse clima regional

    Directory of Open Access Journals (Sweden)

    Daiane Oliveira

    2017-06-01

    Full Text Available Quando em 1979 Edmon Nimer lança seu livro “Climatologia do Brasil”, um aparato para inúmeros trabalhos é lançado, dado que neste um catálogo com os principais tipos climáticos do país é apresentado. Posteriormente, novos autores e metodologias foram sendo adotadas, e o (reconhecimento de climas cada vez mais específicos vai acontecendo. È partindo deste contexto e aproveitando dos SIG’s para aquisição e manuseio dos dados, que a proposta deste estudo foi realizar um levantamento da climatologia da bacia hidrográfica do rio Preto – MG/RJ, através da relação da influência dos fatores geográficos na formação desse clima regional. Foram construídos mapas e produtos cartográficos. E como resultado constatou-se que a bacia se localiza em uma área de transição climática, havendo uma intrínseca relação entre o tempo e o ambiente.

  8. Study of the neutron-rich nuclei with N=21, sup 3 sup 5 Si and sup 3 sup 3 Mg, by beta decay of sup 3 sup 5 Al and sup 3 sup 3 Na

    CERN Document Server

    Nummela, S; Caurier, E; Courtin, S; Dessagne, P; Holmlund, E; Jokinen, A; Knipper, A; Le Scornet, G; Mieh, C; Nowacki, F; Lyapin, L G; Oinonen, M; Poirier, E; Radivojevic, Z; Ramdhane, M; Trzaska, W H; Walter, G; Äystö, J

    2002-01-01

    The first information on the level structure of the N=21 nuclei, sup 3 sup 5 Si and sup 3 sup 3 Mg, has been obtained by the beta decay study of sup 3 sup 5 Al and sup 3 sup 3 Na, produced by fragmentation of an UC target with 1.4 GeV protons at CERN/ISOLDE. The experimental technique involved beta-gamma, beta-gamma-gamma, and beta-n-gamma coincidences, neutron spectra being obtained by time of flight measurements. Gamma detection was made either using large Ge counters or small BaF sub 2 scintillators (for lifetime measurements). In the case of the sup 3 sup 5 Al decay, (T sub 1 sub / sub 2 =41.6(2.2) ms), a simple structure has been found for the level scheme of sup 3 sup 5 Si (Z=14, N=21) which has been interpreted with the level sequence : 7/2 sup - , 3/2 sup - and 3/2 sup + corresponding respectively to the ground state and the states at 910 and 974 keV. The life-time of the 974 keV [T sub 1 sub / sub 2 =5.9(6) ns] is found consistent with the proposed level scheme and multipolarities. The investigation ...

  9. Formkoexistenz in $^{32}$Mg: entdeckung des angeregten 0$^{+}$ zustands

    CERN Document Server

    Wimmer, Kathrin

    2010-01-01

    The evolution of shell structure in exotic nuclei as a function of proton (${Z}$) and neutron (${N}$) number is currently at the center of many theoretical and experimental investigations. It has been realized that the interaction of the last valence protons and neutrons, in particular the monopole component of the residual interaction between those nucleons, can lead to significant shifts in the single-particle energies, leading to the collapse of classic shell closures and the appearance of new shell gaps. The “Island of Inversion” around $^{32}$Mg, which is one of the most studied phenomena in the nuclear chart, is a well known example for such changes in nuclear structure. In this region of neutron-rich nuclei around the magic number${ N}$ = 20 strongly deformed ground states in Ne, Na, and Mg isotopes have been observed. Due to the reduction of the ${N}$ = 20 shell gap quadrupole correlations can enable low-lying deformed 2${p}$ − 2${h}$ intruder states from the ${fp}$-shell to compete with spheric...

  10. Impacto do monocultivo de café sobre os indicadores biológicos do solo na zona da mata mineira Impact of monocultivation coffee on biological indicators of quality soil in the zona da mata (MG, Brazil

    Directory of Open Access Journals (Sweden)

    Luís Alfredo Pinheiro Leal Nunes

    2009-12-01

    Full Text Available Este estudo teve como objetivo avaliar o efeito do monocultivo de café em um latossolo, na Zona da Mata mineira, por meio de alterações em indicadores microbiológicos de qualidade do solo. Foram selecionadas quatro áreas: a cultivo de café (Mundo Novo durante 22 anos (C22, após uso com pastagem; b cultivo de café (Catuaí durante 16 anos (C16, antes mata secundária; c mata secundária com aproximadamente de 30 anos (M30 e d mata secundária com 40 anos (M40. Para tanto, amostras compostas de solos foram coletadas na profundidade de 0-10cm, em janeiro, abril, julho e outubro. As variáveis biológicas estudadas se mostraram sensíveis para caracterizar alterações de qualidade do solo decorrentes do monocultivo de café. Os resultados variaram com a estação do ano e o clima, e, no período mais seco, ocorreu uma redução nos valores, afetando mais drasticamente os sistemas com café. O índice de qualidade do solo demonstrou que o sistema C22 apresentou maior perda de qualidade em relação ao M40, indicando o comprometimento de sua sustentabilidade.This study aimed to evaluate the effect of the coffee monoculture in an oxisol of the Zona da Mata (MG, Brazil through changes in total organic carbon in the soil and microbiological indicators of soil quality. Four areas were selected: a culture of coffee (Novo Mundo during 22 years (C22; b culture of coffee (Catuaí during 16 years (C16 c secondary forest with approximately 30 years old (M30 and d secondary forest during 40 years (M40. Soil samples were collected in the depth of 0-10cm in January, April, July and October. The biological variables studied were sensitive to characterize changes in soil quality from coffee monoculture. The results varied with the season and climate. In the driest period, a reduction in the values occurred, affecting more drastically the coffee systems. The index of soil quality showed that the C22 system presented greater loss of quality in relation to the

  11. Eficácia do regime terapêutico empregando a associação de pantoprazol, claritromicina e amoxicilina, durante uma semana, na erradicação do Helicobacter pylori em pacientes com úlcera péptica Efficacy of the dosing regimen of pantoprazole 40 mg, amoxicillin 1000 mg and clarithromycin 500 mg, twice daily for 7 days, in the eradication of Helicobacter pylori in patients with peptic ulcer

    Directory of Open Access Journals (Sweden)

    Luiz Gonzaga Vaz Coelho

    2004-03-01

    Full Text Available OBJETIVO: Estudo multicêntrico, aberto, delineado para determinar a eficácia da associação de pantoprazol, claritromicina e amoxicilina, na erradicação do Helicobacter pylori em pacientes portadores de úlcera péptica. MATERIAL E MÉTODOS: Setenta e um pacientes (36 mulheres, 35 homens, idade média 41,9 anos provenientes de três centros universitários brasileiros (Belo Horizonte e Porto Alegre com úlcera péptica confirmada à endoscopia e infecção por H. pylori comprovada por, no mínimo, dois testes diagnósticos. Os pacientes foram tratados com a associação de pantoprazol 40 mg, claritromicina 500 mg e amoxicilina 1,0 g, administrada duas vezes ao dia, durante 7 dias. RESULTADOS: Ao final do tratamento, os pacientes foram reexaminados para avaliação dos sintomas gastrointestinais, presença de eventos adversos e aderência ao tratamento. Nova endoscopia com biopsias e teste respiratório com 13C-uréia foram repetidos 60 dias após o término do tratamento para determinação das taxas de erradicação do microrganismo. Foram considerados H. pylori negativos os pacientes com, pelo menos, o teste respiratório com 13C-uréia e mais um teste (teste da urease ou histologia negativos. Ao final do estudo 60/69 (87%, 95% = 78,9-94,8 pacientes erradicaram o H. pylori na análise por protocolo e 60/71 (84,5%, 95% = 76-92,9 na análise por intenção de tratamento. Um paciente interrompeu o tratamento devido à diarréia. Doze pacientes (16,9% apresentaram sintomas adversos e considerados de leve intensidade. CONCLUSÃO: A associação de pantoprazol, amoxicilina e claritromicina por 7 dias constitui alternativa eficaz e bem tolerada para a erradicação do H. pylori em portadores de úlcera péptica no Brasil.AIM: This is an open label, multicenter trial to determine the efficacy of the association of pantoprazole, clarithromycin and amoxicillin to eradicate Helicobacter pylory in patients with peptic ulcer. MATERIAL AND METHODS

  12. PARADOXOS E COMPLEXIDADE NA GESTÃO DO MOSAICO DE UNIDADES DE CONSERVAÇÃO DA ÁREA DE PROTEÇÃO AMBIENTAL CACHOEIRA DAS ANDORINHAS – OURO PRETO/MG

    Directory of Open Access Journals (Sweden)

    Raquel Faria Scalco

    2011-04-01

    Full Text Available O objeto de estudo da presente pesquisa é o mosaico de unidades de conservação da Área de Proteção Ambiental Cachoeira das Andorinhas, localizado em de Ouro Preto-MG. O principal objetivo deste trabalho foi entender as relações sociais de produção e utilização dos recursos naturais e as contradições que dizem respeito à sua conservação. Para tanto, a metodologia adotada foi pesquisa qualitativa, com coleta de dados primários e secundários, com a utilização de diferentes procedimentos metodológicos: pesquisa bibliográfica; pesquisa de gabinete; trabalhos de campo; leitura e análise de atas de fóruns de participação; entrevistas semi-estruturadas com agentes envolvidos na gestão do mosaico da APA; e observação possibilitada pela participação em eventos locais. Os paradoxos e as contradições próprios da gestão de realidades complexas foram identificados, analisados, agrupados em temas e descritos por meio do que se convencionou chamar de fenômenos retro-interacionais. Assim, foi feita uma análise crítica e reflexiva sobre o mosaico da APA Cachoeira das Andorinhas, verificando a adequação de seus instrumentos de gestão e identificando as contradições e os paradoxos da gestão deste mosaico.

  13. Tunable-color luminescence via energy transfer in NaCa13/18Mg5/18PO4:A (A = Eu2+/Tb3+/Mn2+, Dy3+) phosphors for solid state lighting.

    Science.gov (United States)

    Li, Kai; Fan, Jian; Mi, Xiaoyun; Zhang, Yang; Lian, Hongzhou; Shang, Mengmeng; Lin, Jun

    2014-11-17

    A series of NaCa13/18Mg5/18PO4(NCMPO):A (A = Eu(2+)/Tb(3+)/Mn(2+), Dy(3+)) phosphors have been prepared by the high-temperature solid-state reaction method. The X-ray diffraction (XRD) and Rietveld refinement, X-ray photoelectron spectroscopy (XPS), photoluminescence (PL), cathodoluminescence (CL), decay lifetimes, and PL quantum yields (QYs) were utilized to characterize the phosphors. The pure crystalline phase of as-prepared samples has been demonstrated via XRD measurement and Rietveld refinements. XPS reveals that the Eu(2+)/Tb(3+)/Mn(2+) can be efficiently doped into the crystal lattice. NCMPO:Eu(2+)/Tb(3+)/Mn(2+) phosphors can be effectively excited under UV radiation, which show tunable color from purple-blue to red including white emission based on energy transfer from Eu(2+) to Tb(3+)/Mn(2+) ions. Under low-voltage electron beam bombardment, the NCMPO:A (A = Eu(2+)/Tb(3+)/Mn(2+), Dy(3+)) display their, respectively, characteristic emissions with different colors, and the CL spectrum of NCMPO:0.04Tb(3+) has the comparable intensity to the ZnO:Zn commercial product. In addition, the calculated CIE coordinate of NCMPO:0.04Tb(3+) (0.252, 0.432) is more saturated than it (0.195, 0.417). These results reveal that NCMPO:A (A = Eu(2+)/Tb(3+)/Mn(2+), Dy(3+)) may be potential candidate phosphors for WLEDs and FEDs.

  14. Effect of Alumina Incorporation on the Surface Mineralization and Degradation of a Bioactive Glass (CaO-MgO-SiO2-Na2O-P2O5-CaF2-Glycerol Paste

    Directory of Open Access Journals (Sweden)

    Dilshat Tulyaganov

    2017-11-01

    Full Text Available This study investigates the dissolution behavior as well as the surface biomineralization in simulated body fluid (SBF of a paste composed of glycerol (gly and a bioactive glass in the system CaO-MgO-SiO2-Na2O-P2O5-CaF2 (BG. The synthesis of the bioactive glass in an alumina crucible has been shown to significantly affect its bioactivity due to the incorporation of aluminum (ca. 1.3–1.4 wt % into the glass network. Thus, the kinetics of the hydroxyapatite (HA mineralization on the glass prepared in the alumina crucible was found to be slower than that reported for the same glass composition prepared in a Pt crucible. It is considered that the synthesis conditions lead to the incorporation of small amount of aluminum into the BG network and thus delay the HA mineralization. Interestingly, the BG-gly paste was shown to have significantly higher bioactivity than that of the as-prepared BG. Structural analysis of the paste indicate that glycerol chemically interacts with the glass surface and strongly alter the glass network architecture, thus generating a more depolymerized network, as well as an increased amount of silanol groups at the surface of the glass. In particular, BG-gly paste features early intermediate calcite precipitation during immersion in SBF, followed by hydroxyapatite formation after ca. seven days of SBF exposure; whereas the HA mineralization seems to be suppressed in BG, probably a consequence of the incorporation of aluminum into the glass network. The results obtained within the present study reveal the positive effect of using pastes based on bioactive glasses and organic carriers (here alcohols which may be of interest not only due to their advantageous visco-elastic properties, but also due to the possibility of enhancing the glass bioactivity upon surface interactions with the organic carrier.

  15. Síntese de MgAl2O4 por combustão assistida por micro-ondas: influência dos parâmetros de síntese na formação e na estrutura cristalina

    Directory of Open Access Journals (Sweden)

    R. L. B. A. Medeiros

    Full Text Available Resumo Nos últimos anos a técnica de combustão assistida por micro-ondas vem recebendo uma atenção especial, por ser uma técnica rápida, de baixo custo e de fácil manuseio, que permite obter materiais com boa homogeneidade química. O aluminato de magnésio (MgAl2O4 é um dos mais bem conhecidos materiais cerâmicos devido às suas excelentes propriedades, como alto ponto de fusão, elevada resistência mecânica em altas temperaturas, boa resistência ao choque térmico e resistência a ácidos e bases. O propósito deste trabalho é avaliar a influência da razão combustível/oxidante (Rco, temperatura de calcinação (Tcal e da potência do micro-ondas (Pmic na formação e na estrutura cristalina do MgAl2O4. Para realizar a reação de combustão foram utilizadas três potências (450, 675 e 900 W e três razões combustível/oxidante (0,8:1, 1:1 e 1,2:1. O material foi calcinado em três temperaturas (700, 800 e 900 ºC e foram realizadas análises de difração de raios X e microscopia eletrônica por varredura. Um planejamento fatorial 23 foi utilizado para avaliar a influência da Rco, Tcal e Pmic nos parâmetros como a cristalinidade e o tamanho de cristalito. Os resultados mostram que para os MgAl2O4 sintetizados com Rco maiores que 1:1 e Pmic menores que 675 W são obtidos tamanhos de cristalito entre 10 e 20 nm quando calcinados a 700 e 800 ºC. Com relação ao grau de cristalinidade, somente a Tcal exerce uma influência significativa.

  16. Evaluation of the thermoluminescent detector answers of CaSO{sub 4}:Dy, LiF:Mg,Ti and micro LiF:Mg,Ti in photon clinical beams dosimetry using water simulator; Avaliacao da resposta de detectores termoluminescentes de CaSO4:Dy, LiF:Mg,Ti e microLiF:Mg,Ti na dosimetria de feixes clinicos de fotons utilizando simulador de agua

    Energy Technology Data Exchange (ETDEWEB)

    Matsushima, Luciana C.; Veneziani, Glauco R.; Campos, Leticia L., E-mail: lmatsushima@usp.b, E-mail: veneziani@ipen.b, E-mail: lcrodri@ipen.b [Instituto de Pesquisas Energeticas e Nucleares (GMR/IPEN/CNEN-SP), Sao Paulo, SP (Brazil). Gerencia de Metrologia das Radiacoes; Sakuraba, Roberto K.; Cruz, Jose C. da, E-mail: rsakuraba@einstein.b, E-mail: jccruz@einstein.b [Sociedade Beneficente Israelita Brasileira, Sao Paulo, SP (Brazil). Hospital Albert Einstein (HAE)

    2011-10-26

    This paper perform the comparative study of thermoluminescent answer of calcium sulfate dosemeter doped with dysprosium (DaSO{sub 4}:Dy) produced by the IPEN, Sao Paulo, with answer of lithium fluoride dosemeters doped with magnesium and titanium (LiF:Mg, Ti) in the dosimetry of clinical beams of photons (6 and 15 MV) by using water simulator object. Dose-answer curves were obtained for gamma radiation of cobalt-60 in the air and in conditions of electronic equilibrium (plate of PMMA), and clinical photons of CLINAC model 2100C accelerators of the two evaluated hospitals: Hospital das Clinicas of the Faculty of Medicine of Sao Paulo university and Hospital Albert Einstein. It was also evaluated the sensitivity and reproduction of the three dosemeters

  17. Plate Tectonic Cycling and Whole Mantle Convection Modulate Earth's 3He/22Ne Ratio

    Science.gov (United States)

    Dygert, N. J.; Jackson, C.; Hesse, M. A.; Tremblay, M. M.; Shuster, D. L.; Gu, J.

    2016-12-01

    3He and 22Ne are not produced in the mantle or fractionated by partial melting, and neither isotope is recycled back into the mantle by subduction of oceanic basalt or sediment. Thus, it is a surprise that large 3He/22Ne variations exist within the mantle and that the mantle has a net elevated 3He/22Ne ratio compared to volatile-rich planetary precursor materials. Depleted subcontinental lithospheric mantle and mid-ocean ridge basalt (MORB) mantle have distinctly higher 3He/22Ne compared to ocean island basalt (OIB) sources ( 4-12.5 vs. 2.5-4.5, respectively) [1,2]. The low 3He/22Ne of OIBs approaches chondritic ( 1) and solar nebula values ( 1.5). The high 3He/22Ne of the MORB mantle is not similar to solar sources or any known family of meteorites, requiring a mechanism for fractionating He from Ne in the mantle and suggesting isolation of distinct mantle reservoirs throughout geologic time. We model the formation of a MORB source with elevated and variable 3He/22Ne though diffusive exchange between dunite channel-hosted basaltic liquids and harzburgite wallrock beneath mid-ocean ridges. Over timescales relevant to mantle upwelling beneath spreading centers, He may diffuse tens to hundreds of meters into wallrock while Ne is relatively immobile, producing a regassed, depleted mantle lithosphere with elevated 3He/22Ne. Subduction of high 3He/22Ne mantle would generate a MORB source with high 3He/22Ne. Regassed, high 3He/22Ne mantle lithosphere has He concentrations 2-3 orders of magnitude lower than undegassed mantle. To preserve the large volumes of high 3He/22Ne mantle required by the MORB source, mixing between subducted and undegassed mantle reservoirs must have been limited throughout geologic time. Using the new 3He/22Ne constraints, we ran a model similar to [3] to quantify mantle mixing timescales, finding they are on the order of Gyr assuming physically reasonable seafloor spreading rates, and that Earth's convecting mantle has lost >99% of its primordial

  18. Characterization of 22Ne implanted target by 22Ne(p,γ)23Na resonance reaction

    International Nuclear Information System (INIS)

    Bisoi, Abhijit; Saha Sarkar, M.; Desai, C.A.; Tribedi, L.C.; Jung, H.S.; Setoodehnia, K.; Lyons, S.; Görres, J.; Stech, Ed; Robertson, D.; Wiescher, M.

    2013-01-01

    Studies of nuclear reactions relevant to astrophysical scenario, often require measurement of cross section in picobarn to nano-barn range (1 barn = 10 −24 cm 2 ). So we need targets which are isotopically pure and can withstand high beam load over a long time. Even the backings used should contain no or very low concentration of impurities. Implantation technique has been found to be one of the most effective methods to produce such targets

  19. Financial Transaction Tax (Davek na finančne transakcije

    Directory of Open Access Journals (Sweden)

    Meta Ahtik

    2014-10-01

    Full Text Available Financial transaction tax has been proposed already by Keynes; however it has been introduced only in some individual countries and not globally, which would reduce possibilities for tax evasion. Nevertheless, the topic gained importance during the recent financial crisis – the tax is supposed to reduce risky activities of the financial industry and fill the budgets with the means for alleviating the consequences of the crisis, largely caused by the financial industry. Proposal of the European Commission is therefore the first concrete proposal that addresses a wider economic area. This paper investigates economic, theoretical rationale for the introduction of a financial transaction tax and studies its structure and consequences in several European countries: United Kingdom, France, Italy and Sweden. Special emphasis is given to the proposal of the European Commission that would, in case it is confirmed, apply also to Slovenia, although some concerns have arisen recently, weather Slovenia should introduce the tax or not.

  20. Ne smotrite na nas s zhalostju / Andrei Babin

    Index Scriptorium Estoniae

    Babin, Andrei

    2004-01-01

    Andrei Tantsõrevi filmi "Sergei ja Boris" ühest kangelasest, harrastuskunstnik Sergei Groshevist, kes põeb sclerosis multiplex' juba sündimisest saadik. Igor Leontjev, kellega peaosas käivad proovid Irina Tominga lavastatud näidendis "Ozhidanije Godot v odnoi otdelno vzjatoi semje". Arst Natalja Zenevitshist, kes julgustab parandamatu haigusega toime tulema ja elust rõõmu tundma

  1. Hamid Karzai provjol peregovorõ ne na urovne

    Index Scriptorium Estoniae

    2007-01-01

    Afganistani president Hamid Karzai ja USA president George W. Bush pidasid läbirääkimisi Camp Davidis Afganistani ülesehitamise ja koostöö üle terrorismivastases koalitsioonis. Erimeelsustest suhtumises Iraani ja Pakistani küsimusse

  2. Laser trapping of 21Na atoms

    International Nuclear Information System (INIS)

    Lu, Zheng-Tian.

    1994-09-01

    This thesis describes an experiment in which about four thousand radioactive 21 Na (t l/2 = 22 sec) atoms were trapped in a magneto-optical trap with laser beams. Trapped 21 Na atoms can be used as a beta source in a precision measurement of the beta-asymmetry parameter of the decay of 21 Na → 21 Ne + Β + + v e , which is a promising way to search for an anomalous right-handed current coupling in charged weak interactions. Although the number o trapped atoms that we have achieved is still about two orders of magnitude lower than what is needed to conduct a measurement of the beta-asymmetry parameter at 1% of precision level, the result of this experiment proved the feasibility of trapping short-lived radioactive atoms. In this experiment, 21 Na atoms were produced by bombarding 24 Mg with protons of 25 MeV at the 88 in. Cyclotron of Lawrence Berkeley Laboratory. A few recently developed techniques of laser manipulation of neutral atoms were applied in this experiment. The 21 Na atoms emerging from a heated oven were first transversely cooled. As a result, the on-axis atomic beam intensity was increased by a factor of 16. The atoms in the beam were then slowed down from thermal speed by applying Zeeman-tuned slowing technique, and subsequently loaded into a magneto-optical trap at the end of the slowing path. The last two chapters of this thesis present two studies on the magneto-optical trap of sodium atoms. In particular, the mechanisms of magneto-optical traps at various laser frequencies and the collisional loss mechanisms of these traps were examined

  3. AVALIAÇÃO DA QUALIDADE FÍSICO-QUÍMICA, MICROBIOLÓGICA E MICROSCÓPICA DE POLPAS DE FRUTAS CONGELADAS COMERCIALIZADAS NA CIDADE DE VIÇOSA-MG

    Directory of Open Access Journals (Sweden)

    J. M. A. T. K. PEREIRA

    2009-01-01

    Full Text Available

    O objetivo deste trabalho foi avaliar a qualidade físico-química e o aspecto higiênico-sanitário de polpas de frutas congeladas comercializadas na cidade de Viçosa-MG. Foram realizadas análises físico-químicas, microbiológicas e de microscopia em polpa de fruta congelada, de três marcas comerciais (A, B e C, das seguintes frutas: açaí, caju, goiaba, graviola e morango, totalizando 15 amostras. As análises realizadas foram: pH, sólidos solúveis em ºBrix, atividade de água, cor (L*, a*, b*, microbiológicas (coliformes totais, coliformes à 45 ºC e fungos filamentosos e leveduras e microscopia (análise de sujidade e fragmentos. Os resultados obtidos indicaram que, do ponto de vista físico-químico, as polpas açaí- marcas A, B e C, graviola - marca B e graviola, caju e goiaba - marca C apresentaram valores de ºBrix inferiores ao exigido pela legislação que regulamenta 40 ºBrix, 9,00 ºBrix, 10,0 ºBrix e 7,00 ºBrix , respectivamente. As demais amostras atenderam à legislação. As análises estatísticas de cor mostraram diferença significativa (p<0,05 entre as marcas. As contagens de fungos filamentosos variaram de < 10 a 2,6x104 UFC/g e as contagens de coliformes à 45 ºC nas amostras foram < 3 NMP/g. As análises microscópicas classificaram algumas amostras como inaceitáveis para o consumo, sendo encontrados fragmentos de insetos/larvas nas polpas de caju (marcas A e C, goiaba (marca B e graviola (marca A. Os resultados obtidos evidenciam a necessidade de maior fiscalização e treinamento dos manipuladores de polpas para melhoria da qualidade do produto.

  4. PRIVLAČNOST FRANŠIZNEGA KONCEPTA ZA KOZMETIČNE SALONE PODJETJA KOZMETIKA AFRODITA D.O.O.

    OpenAIRE

    Mijošek, Ivo

    2013-01-01

    Delo diplomskega seminarja se osredotoča na zgodovinski razvoj franšiznega koncepta, njegove različne oblike ter ključne pravice in dolžnosti, ki jih potencialni franšizij pridobi z odločitvijo za franšizo. Nadalje teoretični del seminarja opisuje ključne sestavine vsake franšizne pogodbe ter se osredotoča na prednosti ter slabosti franšiznega koncepta, tako za franšizorja kot za franšizija. Ključni prednosti za franšizorja sta hitra prisotnost na več tujih trgih ter deljena odgovornost na po...

  5. Estrutura do componente arbustivo-arbóreo de dois estádios sucessionais de floresta estacional semidecidual na Reserva Florestal Mata do Paraíso, Viçosa, MG, Brasil Structure of the tree-shrub component in two successional stages of semideciduous forest in the Mata do Paraíso Forest Reserve, Viçosa, MG, Brazil

    Directory of Open Access Journals (Sweden)

    Sheila Isabel do Carmo Pinto

    2007-10-01

    Full Text Available Realizou-se o estudo das variações estruturais do componente arbustivo- arbóreo em dois estádios sucessionais - inicial e madura - de Floresta Estacional Semidecidual, na Reserva Florestal Mata do Paraíso, em Viçosa, MG, Brasil. A Reserva Florestal está situada nas coordenadas 20º45'S e 42º55'W e a uma altitude média de 689 m. O clima da região é classificado como Cwb pelo sistema de Köppen. As espécies arbustivo-arbóreas foram amostradas dentro de 20 parcelas de 10 x 30 m, sendo 10 parcelas em cada estádio sucessional, sendo considerados apenas os indivíduos com diâmetro a 1,30 m do solo (DAP > 4,8 cm. Na floresta inicial foram amostrados 399 indivíduos, distribuídos em 27 famílias e 55 espécies. As espécies com maior valor de importância (VI foram Piptadenia gonoacantha, Vernonanthura diffusa, Miconia cinnamomifolia, Piptocarpha macropoda e Luehea grandiflora. O índice de diversidade de Shannon (H' foi de 3,31 nat.ind.-1 e a equabilidade de Pielou (J', igual a 0,83. No estádio floresta madura foram amostrados 623 indivíduos, distribuídos em 31 famílias e 78 espécies. As espécies com maior valor de importância (VI foram Euterpe edulis, Piptadenia gonoacantha, Nectandra lanceolata, Myrcia sphaerocarpa e Guapira opposita. O índice de diversidade de Shannon (H' foi de 3,46 nat.ind.-1 e a equabilidade de Pielou (J', igual a 0,79. As distribuições diamétricas das quatro espécies mais abundantes em cada estádio sucessional apresentaram padrões distintos, aparentemente relacionados ao estádio sucessional.The study of the floristic and structural variations of the tree-shrub component was carried out in two successional stages of Semideciduous Forest, initial and mature, located in the Mata do Paraíso Forest Reserve, in Viçosa, Minas Gerais State, Brazil. The Forest Reserve is located at 20º45'S and 42º55'W, with average altitude of 689 m. The regional climate is classified as Cwb by the Köppen system

  6. Neutrino Interactions in MicroBooNE

    OpenAIRE

    Del Tutto, Marco

    2017-01-01

    MicroBooNE is a liquid-argon-based neutrino experiment, which began collecting data in Fermilab's Booster neutrino beam in October 2015. Physics goals of the experiment include probing the source of the anomalous excess of electron-like events in MiniBooNE. In addition to this, MicroBooNE is carrying out an extensive cross section physics program that will help to probe current theories on neutrino-nucleon interactions and nuclear effects. These proceedings summarise the status of MicroBooNE'...

  7. Comparação do efeito analgésico entre etoricoxib 90 mg e dipirona sódica na exérese de pterígio primário com transplante autólogo de conjuntiva Comparison of the analgesic effect between 90 mg etoricoxib and dipyrone after exeresis of primary pterygium with conjunctival autograft

    Directory of Open Access Journals (Sweden)

    Kariza Aiko Frantz

    2009-10-01

    Full Text Available OBJETIVO: Comparar o efeito analgésico entre dipirona sódica e etoricoxib 90 mg após exérese de pterígio primário com transplante autólogo de conjuntiva. MÉTODOS: Trata-se de um ensaio clínico prospectivo, randomizado, duplo-mascarado. Três grupos de 26 pacientes (1 olho por paciente foram operados e receberam as medicações em estudo durante os cinco dias seguintes à cirurgia. Foi utilizada uma escala de dor, numerada de zero a dez, para avaliação pelo paciente no 1É, 3É e 5É dias pós-operatórios. A dor foi classificada em ausente (zero, leve (1 a 3, moderada (4 a 7 e intensa (8 a 10. A análise estatística foi realizada com o software SPSS, versão 11.5. RESULTADOS: Foi observada diferença estatisticamente significativa entre etoricoxib e dipirona no 1É e 3É dia pós-operatório (PO (p=0,001 e p=0,01; respectivamente. O etoricoxib foi superior ao placebo apenas no 1É PO (p=0,04. Não houve diferença de resultados entre dipirona e placebo. CONCLUSÕES: A analgesia do etoricoxib foi superior à do placebo no PO1 e à da dipirona no PO1 e PO3, na exérese de pterígio primário com transplante autólogo de conjuntiva. Não houve diferença significativa da analgesia pós-operatória entre dipirona e placebo no mesmo procedimento.Purpose: To compare the analgesic effect between dipyrone, 90 mg etoricoxib, and placebo after excision of primary pterygium with conjunctival autograft. METHODS: Prospective, randomized, double-masked clinical trial. Three groups of 26 patients (one eye per patient were submitted to surgery and received the study drugs for five days after surgery. A scale of pain was used, graduated from zero to ten, for patient evaluation in the first, third and fifth postoperative days. The pain was classified as absent (zero, mild (1 to 3, moderate (4 to 7 and severe (8 to 10. Statistical analysis was performed with the SPSS, version 11.5. RESULTS: A statistically significant difference was found between

  8. Ziekenhuiscultuur op het gebied van hygiëne en patiëntveiligheid

    NARCIS (Netherlands)

    Straathof, Alex; Unger, Meike; Mees, Michiel

    2012-01-01

    Cultuurbeschrijving ziekenhuizen naar aanleiding van de Zembla-uitzending over de hygiëne in ziekenhuizen uit 2009. Na deze uitzending zijn er regels en protocollen ingevoerd en hebben ziekenhuizen zich gecommitteerd aan een verandering van het gedrag van hun personeel.

  9. Low-spin states of 23Na

    International Nuclear Information System (INIS)

    Bakkum, E.L.

    1987-01-01

    A study of 23 Na via the 22 Ne(p,γ) 23 Na and 23 Na(γ,γ) 23 Na reactions is presented. Only a limited number of resonances has been studied, selected on the basis of strong excitation of the lowest levels of which the spin was unknown. As a result the spins are now known of all levels of 23 Na with excitation energies up to 7 MeV, except for a few high-spin states which are too weakly excited in the decay of the known 22 Ne(p,γ) resonances. The mean lifetimes of the 23 Na levels at 4.43 and 7.89 MeV were found to be 350±70 and 220±17 attoseconds (1 attosecond = 10 -18 seconds) respectively. 97 refs.; 22 figs.; 12 tabs

  10. Stimulated emission (4F3/2 → 4I11/2 channel) with LD and Xe-flashlamp pumping of tetragonal, incommensurately modulated Ca2MgSi2O7:Nd3+(Na+) – a new disordered laser crystal

    International Nuclear Information System (INIS)

    Kaminskii, A A; Nakao, H; Ueda, K; Shirakawa, A; Bohatý, L; Becker, P; Liebertz, J; Kleinschrodt, R

    2010-01-01

    Non-centrosymmetric tetragonal crystal Ca 2 MgSi 2 O 7 :Nd 3+ (Na + ) with incommensurately modulated melilite-type structure is presented as a new laser crystal. By LD and Xe-flashlamp pumping its CW and free-running pulsed stimulated emission of the 4 F 3/2 → 4 I 11/2 generation channel of Nd 3+ lasant ions was excited

  11. Discovery of the shape coexisting 0+ state in 32Mg

    International Nuclear Information System (INIS)

    Wimmer, Kathrin

    2010-01-01

    The evolution of shell structure in exotic nuclei as a function of proton (Z) and neutron (N) number is currently at the center of many theoretical and experimental investigations. It has been realized that the interaction of the last valence protons and neutrons, in particular the monopole component of the residual interaction between those nucleons, can lead to significant shifts in the single-particle energies, leading to the collapse of classic shell closures and the appearance of new shell gaps. The ''Island of Inversion'' around 32 Mg, which is one of the most studied phenomena in the nuclear chart, is a well known example for such changes in nuclear structure. In this region of neutron-rich nuclei around the magic number N=20 strongly deformed ground states in Ne, Na, and Mg isotopes have been observed. Due to the reduction of the N=20 shell gap quadrupole correlations can enable low-lying deformed 2p-2h intruder states from the fp-shell to compete with spherical normal neutron 0p-0h states of the sd-shell. In this situation the promotion of a neutron pair across the N=20 gap can result in deformed intruder ground states. Consequentially the two competing configurations can lead to the coexistence of spherical and deformed 0 + states in the neutron rich nuclei 30,32 Mg. In this work the shape coexistence in 32 Mg was studied by a two neutron transfer reaction at the REX-ISOLDE facility (CERN). The two neutron transfer reaction with a 30 Mg beam involved for the first time the use of a radioactive tritium target in combination with a radioactive heavy ion beam. Light charged particles emitted from the target were detected and identified by the T-REX particle detector while γ-rays were detected by the MINIBALL Germanium detector array. The shape of the angular distribution of the protons allows to unambiguously determine the angular momentum transfer ΔL of the reaction and thus to identify the 0 + states. The analysis of excitation energies and angular

  12. MiniBooNE Oscillation Results

    International Nuclear Information System (INIS)

    Djurcic, Zelimir

    2009-01-01

    These proceedings summarize the MiniBooNE ν μ → ν e results, describe the first (bar ν) μ → (bar ν) e result, and current analysis effort with the NuMI neutrinos detected in the miniBooNE detector

  13. Crescimento , produção de matéria seca e acúmulo de N, P, K, Ca, Mg e S na parte aérea de mudas de andiroba (Carapa guianensis Aubl. cultivadas em solo de várzea, em função de diferentes doses de fósforo Growth, dry matter yield and N, P, K, Ca, Mg and S accumulation in andiroba seedling shoots (Carapa guianensis Aubl. cultivated in lowland soil, in function of phosphorus doses

    Directory of Open Access Journals (Sweden)

    Orlando Sílvio Caires Neves

    2004-06-01

    Full Text Available Com o objetivo de avaliar o efeito de diferentes doses de fósforo no crescimento e produção de matéria seca e acúmulo de N, P, K, Ca, Mg e S na parte aérea de mudas de andiroba, cultivadas em solo de várzea, foi conduzido um experimento em casa de vegetação, no Departamento de Ciências do Solo (DCS da Universidade Federal de Lavras (UFLA. O delineamento utilizado foi em blocos casualizados com cinco repetições e quatro doses de fósforo (0, 150, 300 e 450 mg dm-3 de P. Foram avaliados diâmetro do caule (mm, altura de plantas (cm, matéria seca de raiz, caule, folha e total (g planta-1. A partir dos teores dos elementos, determinou-se o acúmulo dos nutrientes com base na matéria seca. A máxima resposta física da planta de andiroba à adubação fosfatada foi obtida na faixa de 239 a 265 mg dm-3 de P. O máximo acúmulo de N, P, K, Ca, Mg e S foi atingido com as doses de 254; 287,5; 244,5; 254; 241; e 275 mg dm-3 de P, respectivamente. Os elementos em estudo que mais acumularam na parte aérea das mudas de andiroba seguem a seguinte ordem decrescente: N > Ca > K > Mg > S > P.To evaluate the effect of phosphorus application on growth, dry matter yield and N, P, K, Ca, Mg and S accumulation in "andiroba" seedling shoots, cultivated in lowland soil, an experiment was conducted under greenhouse conditions at the Soil Science Department (DCS of the Federal University of Lavras (UFLA. The experiment was conducted in a randomized block design, with five replications and four phosphorus doses (0, 150, 300 and 450 mg dm-3 of P. Stem diameter (mm, plant height (cm, root dry matter, stem, leafs and total (g plant-1 were evaluated and the accumulation of the nutrients based on dry matter was determined. The maximum physical response of andiroba to phosphorus was obtained between 239 to 265 mg dm-3 of P. The maximum accumulation of N, P, K, Ca, Mg and S was observed with the doses 254, 287,5, 244,5, 254, 241 and 275 mg dm-3 of P, respectively

  14. Hydrothermal synthesis and crystal structures of Na{sub 2}Be{sub 3}(SeO{sub 3}){sub 4}.H{sub 2}O and Cs{sub 2}[Mg(H{sub 2}O){sub 6}]{sub 3}(SeO{sub 3}){sub 4}

    Energy Technology Data Exchange (ETDEWEB)

    Shen, Chen; Mei, Dajiang; Sun, Chuanling; Liu, Yunsheng; Wu, Yuandong [College of Chemistry and Chemical Engineering, Shanghai University of Engineering Science (China)

    2017-09-04

    The selenites, Na{sub 2}Be{sub 3}(SeO{sub 3}){sub 4}.H{sub 2}O and Cs{sub 2}[Mg(H{sub 2}O){sub 6}]{sub 3}(SeO{sub 3}){sub 4}, were synthesized under hydrothermal conditions. The crystal structures of Na{sub 2}Be{sub 3}(SeO{sub 3}){sub 4}.H{sub 2}O and Cs{sub 2}[Mg(H{sub 2}O){sub 6}]{sub 3}(SeO{sub 3}){sub 4} were determined by single-crystal X-ray diffractions. Na{sub 2}Be{sub 3}(SeO{sub 3}){sub 4}.H{sub 2}O crystallizes in the triclinic space group P1 (no. 2) with unit cell parameters a = 4.8493(9), b = 12.013(2), c = 12.077(2) Aa, and Z = 2, whereas Cs{sub 2}[Mg(H{sub 2}O){sub 6}]{sub 3}(SeO{sub 3}){sub 4} crystallizes in the monoclinic space group C2/m (no. 12) with lattice cell parameters a = 12.596(6), b = 7.297(4), c = 16.914(8) Aa, and Z = 2. Na{sub 2}Be{sub 3}(SeO{sub 3}){sub 4}.H{sub 2}O features a three-dimensional open framework structure formed by BeO{sub 4} tetrahedra and SeO{sub 3} trigonal pyramids. Na cations and H{sub 2}O molecules are located in different tunnels. Cs{sub 2}[Mg(H{sub 2}O){sub 6}]{sub 3}(SeO{sub 3}){sub 4} has a structure composed of isolated [Mg(H{sub 2}O){sub 6}] octahedra and SeO{sub 3} trigonal pyramids interacted by hydrogen bonds, and Cs cations are resided in-between. Both compounds were characterized by thermogravimetric analysis and FT-IR spectroscopy. (copyright 2017 WILEY-VCH Verlag GmbH and Co. KGaA, Weinheim)

  15. VPLIV ELEKTRIČNIH VOZIL NA ZANESLJIVOST ELEKTROENERGETSKEGA SISTEMA

    OpenAIRE

    BOŽIČ, DUŠAN

    2017-01-01

    Zagotavljanje zanesljive oskrbe odjemalcev z električno energijo predstavlja primarno nalogo elektroenergetskih sistemov, na kar kaže tudi spreminjanje načina regulacije sistemskih operaterjev v dereguliranih trgih z električno energijo. Regulatorji pri regulaciji sistemskih operaterjev namreč vse pogosteje uvajajo regulacijo kakovosti dobave električne energije, ki v ospredje postavlja prav zanesljivost sistema. Prihodki sistemskih operaterjev so pri regulaciji kakovosti dobave električne en...

  16. Production of carrier-free 28Mg and 24Na by 50-180 MeV protons on Si, P, S, Cl, Ar and K. Excitation functions and chemical separation

    International Nuclear Information System (INIS)

    Lundqvist, H.; Malmborg, P.

    1976-01-01

    This work investigates the possible use of high energy proton bomardment of silicon, phosphorous, sulphur, chlorine, argon or potassium for production of carrier-free 28 Mg. A chemical separation is essential in this preparation in order to get rid of the bulk of target material and contaminating radionuclides. A simple and efficient method to get carrier-free 28 Mg with neglectible amounts of radio-chemical impurities has been established. (Auth.)

  17. APLICAÇÃO DE GEOTÊXTEIS BIODEGRADÁVEIS NA REDUÇÃO DO ESCOAMENTO SUPERFICIAL E CONTROLE DA EROSÃO SUPERFICIAL, UBERLÂNDIA/MG

    Directory of Open Access Journals (Sweden)

    José Fernando Rodrigues Bezerra

    2011-12-01

    Full Text Available Esse artigo aborda a utilização dos geotêxteis biodegradáveis no controle do escoamento superficial e perda de sedimentos. Para alcançar esse objetivo, uma estação experimental foi construída na Fazenda do Glória, no município de Uberlândia, Minas Gerais, a qual ficou funcionando no período de 18/11/2005 a 30/03/2006. Duas parcelas foram construídas, com as seguintes características: medidas de 1m x 10m, com uma calha, na parte inferior de cada parcela, para coletar água do escoamento superficial e sedimentos transportados. Uma das parcelas ficou sem cobertura vegetal durante todo o monitoramento e a outra recebeu a proteção dos geotêxteis (Buriti e sementes de gramínea. Durante os cinco meses de monitoramento, houve um total de 1.087,22mm de chuva. Na parcela sem cobertura vegetal, o total de escoamento superficial foi de 297,16L m-2, enquanto na parcela com os geotêxteis com gramíneas foi de 123,92L m-2, ou seja, mais da metade do total de escoamento da parcela sem proteção. Em termos da produção de sedimentos, a diferença foi ainda mais significativa; na parcela sem proteção dos geotêxteis, o total de solo erodido foi de 19.778,13g m-2, enquanto na outra parcela, o total foi de apenas 1.317,92g m-2. Esses resultados mostram que os geotêxteis construídos com fibra de Buriti podem ser bem eficientes no controle da erosão

  18. Composição florística do componente arbustivo-arbóreo em dois trechos de floresta estacional semidecidual na Mata do Paraíso, Viçosa, MG

    Directory of Open Access Journals (Sweden)

    Sheila Isabel do Carmo Pinto

    2013-09-01

    Full Text Available É grande a demanda por estudos ecológicos em florestas que possam embasar trabalhos de recuperação e conservação da biodiversidade. Entre esses estudos, primordialmente está o levantamento da flora. Nesse sentido, realizou-se o estudo das variações florísticas do componente arbustivo-arbóreo em dois trechos de Floresta Estacional Semidecidual, floresta inicial e floresta madura, situados na Reserva Florestal Mata do Paraíso, em Viçosa, Minas Gerais. As espécies arbóreo-arbustivas foram amostradas dentro de 20 parcelas de 10 x 30 m, 10 parcelas em cada trecho de floresta, sendo considerados apenas os indivíduos com diâmetro a 1,30 m do solo (DAP  4,8 cm. Na floresta inicial foram amostradas 55 espécies pertencentes a 47 gêneros e 27 famílias. A família com maior riqueza florística foi Fabaceae, com 10 espécies (18%, seguida de Euphorbiaceae (cinco espécies; 9%, Annonaceae, Lauraceae, Meliaceae e Salicaceae (três espécies; 6%. Na floresta madura foram amostradas 78 espécies distribuídas em 62 gêneros e 31 famílias. A família com maior riqueza florística foi Fabaceae, com 13 espécies (17%, seguida de Lauraceae e Myrtaceae (seis espécies; 8%, Euphorbiaceae, Sapindaceae e Salicaceae (cinco espécies; 6%, Annonaceae e Meliaceae (quatro espécies, 5%, Rubiaceae e Moraceae (três espécies; 4%. O grupo ecológico que mais se destacou nos dois trechos de floresta foi o das secundárias iniciais, seguido pelas secundárias tardias na floresta madura e pelas pioneiras na floresta inicial. A variabilidade na composição florística e na proporção de espécies em cada grupo ecológico foi resultante das variações na intensidade da ação antrópica nestas florestas e do tempo de regeneração florestal.

  19. Resonant nuclear reaction 23Mg (p,γ) 24Al in strongly screening magnetized neutron star crust

    Science.gov (United States)

    Liu, Jing-Jing; Liu, Dong-Mei

    2017-12-01

    Based on the relativistic theory of superstrong magnetic fields (SMF), by using three models those of Lai (LD), Fushiki (FGP), and our own (LJ), we investigate the influence of SMFs due to strong electron screening (SES) on the nuclear reaction 23Mg (p,γ) 24Al in magnetars. In a relatively low density environment (e.g., ρ 7102), our reaction rates can be 1.58 times and about three orders of magnitude larger than those of FGP and LD, respectively (B 12, ρ 7 are in units of 1012G, 107g cm-3). The significant increase of strong screening rate can imply that more 23Mg will escape from the Ne-Na cycle due to SES in a SMF. As a consequence, the next reaction, 24Al (β+, ν) 24Mg, will produce more 24Mg to participate in the Mg-Al cycle. Thus, it may lead to synthesis of a large amount of A>20 nuclides in magnetars. Supported by National Natural Science Foundation of China (11565020), the Counterpart Foundation of Sanya (2016PT43), the Special Foundation of Science and Technology Cooperation for Advanced Academy and Regional of Sanya (2016YD28), the Scientific Research Starting Foundation for 515 Talented Project of Hainan Tropical Ocean University (RHDRC201701) and the Natural Science Foundation of Hainan Province (114012)

  20. Dejavniki psihološkega nasilja na delovnem mestu

    OpenAIRE

    Ilc, Teja

    2011-01-01

    Raziskave na področju delovnih razmer kažejo, da je danes pereč problem ravno psihološko nasilje na delovnem mestu. Posebna oblika psihološkega nasilja na delovnem mestu je mobing, s katerim se v praksi srečujemo vsak dan, vendar se ga pogosto ne zavedamo. Namen magistrske naloge je pojasniti pojem in pomen mobinga v delovnih organizacijah, poiskati možne vzroke in posledice, ki vplivajo na ta pojav, ter predlagati rešitve. Poznavanje mehanizmov, ki povzročajo mobing, njegovih vzrokov in...

  1. VPLIV ULCEROZNEGA KOLITISA NA KAKOVOST ŽIVLJENJA

    OpenAIRE

    Dugi, Maja

    2015-01-01

    Pri vsaki bolezni je zelo pomembna kakovost življenja pacientov. Ulcerozni kolitis je kronična bolezen, ki je znana po obdobjih mirovanja in izbruhov, kar definitivno vpliva na posameznika, ki se s tem spopada. Sooča se z raznimi omejitvami, ki vplivajo na njegov vsakdan. Rezultati raziskave so pokazali, da je kakovost življenja bolnikov z ulceroznim kolitisom izrazito okrnjena. Ne le, da se spopadajo z bolečino, ampak tudi s psihičnimi in socialnimi posledicami, ki vplivajo na fizične aktivn...

  2. The MiniBooNE detector

    International Nuclear Information System (INIS)

    Aguilar-Arevalo, A.A.; Anderson, C.E.; Bartoszek, L.M.; Bazarko, A.O.; Brice, S.J.; Brown, B.C.; Bugel, L.; Cao, J.; Coney, L.; Conrad, J.M.; Cox, D.C.; Curioni, A.; Djurcic, Z.; Finley, D.A.; Fleming, B.T.; Ford, R.; Garcia, F.G.; Garvey, G.T.; Green, C.; Green, J.A.

    2009-01-01

    The MiniBooNE neutrino detector was designed and built to look for ν μ →ν e oscillations in the (sin 2 2θ,Δm 2 ) parameter space region where the LSND experiment reported a signal. The MiniBooNE experiment used a beam energy and baseline that were an order of magnitude larger than those of LSND so that the backgrounds and systematic errors would be completely different. This paper provides a detailed description of the design, function, and performance of the MiniBooNE detector.

  3. The NeXus data format

    OpenAIRE

    Könnecke, Mark; Akeroyd, Frederick A.; Osborn, Raymond; Peterson, Peter F.; Richter, Tobias; Suzuki, Jiro; Watts, Benjamin; Wintersberger, Eugen; Wuttke, Joachim; Bernstein, Herbert J.; Brewster, Aaron S.; Campbell, Stuart I.; Clausen, Björn; Cottrell, Stephen; Hoffmann, Jens Uwe

    2015-01-01

    NeXus is an effort by an international group of scientists to define a common data exchange and archival format for neutron, X-ray and muon experiments. NeXus is built on top of the scientific data format HDF5 and adds domain-specific rules for organizing data within HDF5 files, in addition to a dictionary of well defined domain-specific field names. The NeXus data format has two purposes. First, it defines a format that can serve as a container for all relevant data associated with a beamlin...

  4. The MiniBooNE Detector

    OpenAIRE

    MiniBooNE Collaboration

    2008-01-01

    The MiniBooNE neutrino detector was designed and built to look for muon-neutrino to electron-neutrino oscillations in the mixing parameter space region where the LSND experiment reported a signal. The MiniBooNE experiment used a beam energy and baseline that were an order of magnitude larger than those of LSND so that the backgrounds and systematic errors would be completely different. This paper provides a detailed description of the design, function, and performance of the MiniBooNE detector.

  5. The NeXus data format.

    Science.gov (United States)

    Könnecke, Mark; Akeroyd, Frederick A; Bernstein, Herbert J; Brewster, Aaron S; Campbell, Stuart I; Clausen, Björn; Cottrell, Stephen; Hoffmann, Jens Uwe; Jemian, Pete R; Männicke, David; Osborn, Raymond; Peterson, Peter F; Richter, Tobias; Suzuki, Jiro; Watts, Benjamin; Wintersberger, Eugen; Wuttke, Joachim

    2015-02-01

    NeXus is an effort by an international group of scientists to define a common data exchange and archival format for neutron, X-ray and muon experiments. NeXus is built on top of the scientific data format HDF5 and adds domain-specific rules for organizing data within HDF5 files, in addition to a dictionary of well defined domain-specific field names. The NeXus data format has two purposes. First, it defines a format that can serve as a container for all relevant data associated with a beamline. This is a very important use case. Second, it defines standards in the form of application definitions for the exchange of data between applications. NeXus provides structures for raw experimental data as well as for processed data.

  6. UCB-NE-107 user's manual

    International Nuclear Information System (INIS)

    Lee, W.W.L.

    1989-03-01

    The purpose of this manual is to provide users of UCB-NE-107 with the information necessary to use UCB-NE-107 effectively. UCB-NE-107 is a computer code for calculating the fractional rate of readily soluble radionuclides that are released from nuclear waste emplaced in water-saturated porous media. Waste placed in such environments will gradually dissolve. For many species such as actinides and rare earths, the process of dissolution is governed by the exterior flow field, and the chemical reaction rate or leaching rate. However, for readily soluble species such as 135 Cs, 137 Cs, and 129 I, it has been observed that their dissolution rates are rapid. UCB-NE-107 is a code for calculating the release rate at the waste/rock interface, to check compliance with the US Nuclear Regulatory Commission's (USNRC) subsystem performance objective. It is an implementation of the analytic solution given below. 5 refs., 2 figs

  7. Physics Motivations of SciBooNE

    International Nuclear Information System (INIS)

    Hiraide, K.

    2007-01-01

    SciBooNE is a new experiment for measuring neutrino-nucleus cross sections around one GeV region, which is important for the interpretaion of neutrino oscillation experiments. Physics motivations of the experiment are described here

  8. Excited states in 22Mg via the 12C(12C,2n)22Mg reaction

    International Nuclear Information System (INIS)

    Jewett, Cybele; Baktash, Cyrus; Bardayan, Daniel W.; Blackmon, Jeff C.; Chipps, K.; Galindo-Uribarri, Alfredo; Greife, U.; Gross, Carl J.; Jones, K. L.; Liang, Junjien; Livesay, Jake; Kozub, R. L.; Nesaraja, Caroline D; Radford, David C.; Sarazin, F.; Smith, Michael Scott; Thomas, J. S.; Yu, Chang-Hong

    2007-01-01

    The 12C(12C, 2n)22Mg reaction was measured with the CLARION array and the RMS separator at the Holifield Facility of Oak Ridge National Laboratory. This experiment was performed to gather more information on the excited states in 22Mg, which might be of relevance to recent radioactive ion beam measurements of the astrophysically important 21Na(p,γ)22Mg reaction. The results are compared to direct measurements, transfer experiments and a competing experiment performed with Gammasphere

  9. Contrasting geochemical trends in the fertile and refractory parts of the NE Atlantic mantle source

    Science.gov (United States)

    Tronnes, R. G.; Debaille, V.; Brandon, A. D.; Waight, T. E.; Graham, D. W.; Williams, A.; Lee, C. A.

    2008-12-01

    Primitive alkaline basalts from the Icelandic off-rift volcanic zones and Jan Mayen represent low-degree melts from the fertile parts of the NE Atlantic mantle. Olivine tholeiites and picrites from the Icelandic rift zones and nearby oceanic spreading ridges are formed by protracted decompressional melting. The V-shaped ridges along the Reykjanes, Kolbeinsey and Aegir ridges indicate that ascending source material is supplied by a pulsating plume and deflected laterally for distances of about 1000 km from Iceland (Jones et al. GGG 2002; Breivik et al. JGR 2006). Plume material deflected in the direction of the rift zones and spreading ridges undergoes extensive melting at shallow level, whereas material deflected in other directions flows laterally at deeper levels and remains largely unmelted and more fertile. The comparison of a sample suite of primitive off-rift basalts from Iceland and Jan Mayen (Debaille et al., in prep.) with olivine tholeiites and picrites from the Icelandic rift zones (mainly Brandon et al. GCA 2007) demonstrate opposing geochemical trends. The degree of source enrichment, expressed by the La/Sm-ratio, is positively and negatively correlated with 87/86Sr and 143/144Nd throughout the entire range of depleted rift zone tholeiites and enriched off-rift basalts. In the rift zone tholeiites the La/Sm-ratio has negative correlations with Mg# and Mg-content and positive correlations with 187/188Os and 3/4He. These four trends have opposite equivalents for the off-rift basalts. The most enriched and alkaline basalts from Jan Mayen and Snæfellsnes have the lowest 3/4He of 6-9*Ra and 187/188Os of 0.12-0.13. The trends seem to require a source component with ancient melt depletion and subsequent enrichment. A subcontinental lithospheric mantle keel (SCLM) is the most likely origin for the enriched component with high LILE, La/Sm and 87/86Sr and low 143/144Nd, 3/4He and 187/188Os. The most enriched alkaline basalts have notably higher Mg# and Mg and

  10. OGLAŠEVANJE NA DRUŽBENIH OMREŽJIH NA PRIMERU FACEBOOKA

    OpenAIRE

    Novak, Martina

    2012-01-01

    V diplomskem delu obravnavamo družbene medije kot novo priložnost za promocijo in oglaševanje podjetij. Spoznali smo družbena omrežja na splošno in nekaj teh, ki jih uporabljamo tudi v Sloveniji na kratko predstavili. Podrobneje smo se osredotočili na družbeno omrežje Facebook, predvsem na samo spletno stran, njen izgled in storitve, ki jih ponuja uporabnikom. V nalogi je podrobneje opisan Facebook kot orodje za uporabo oglaševanja. Spoznali smo brezplačne in plačljive načine promocije in ogl...

  11. Near-UV and blue wavelength excitable Mg{sub 0.6}Ca{sub 2.16}Mo{sub 0.2}W{sub 0.8}O{sub 6}: Eu{sub 0.12}{sup 3+}/Na{sub 0.12}{sup +} high efficiency red phosphors

    Energy Technology Data Exchange (ETDEWEB)

    Khanna, A. [Smart Lighting Engineering Research Center, Rensselaer Polytechnic Institute, Troy, NY 12180 (United States); Electrical Computer and Systems Engineering, Rensselaer Polytechnic Institute, Troy, NY 12180 (United States); Dutta, P.S., E-mail: duttap@rpi.edu [Smart Lighting Engineering Research Center, Rensselaer Polytechnic Institute, Troy, NY 12180 (United States); Electrical Computer and Systems Engineering, Rensselaer Polytechnic Institute, Troy, NY 12180 (United States)

    2015-05-15

    Red phosphors with narrow emission around 615 nm (with FWHM~5–10 nm) having chemical compositions of A{sub 0.6}Ca{sub 2.16}Mo{sub 0.2}W{sub 0.8}O{sub 6}: Eu{sub 0.12}{sup 3+}/Na{sub 0.12}{sup +} (A=Mg, Sr) have been found to exhibit the highest luminescence amongst the molybdate–tungstate family when excited by sources in the 380–420 nm wavelength range. Thus they are most suitable for enhancing color rendering index and lowering color temperature in phosphor converted white LEDs (pc-WLEDs) with near-UV/blue LED excitation sources. The excitation band edge in the near UV/blue wavelength in the reported phosphor has been attributed to the coordination environment of the transition metal ion (Mo{sup 6+}, W{sup 6+}) and host crystal structure. Furthermore the quantum efficiency of the phosphors has been enhanced by adjusting activator concentration, suitable compositional alloying using substitutional alkaline earth metal cations and charge compensation mechanisms. - Graphical abstract: The charge transfer excitation of orthorhombic Mg{sub 0.6}Ca{sub 2.16}Mo{sub 0.2}W{sub 0.8}O{sub 6}: Eu{sub 0.12}{sup 3+}/Na{sub 0.12}{sup +} is significantly higher than tetragonal CaMoO{sub 4}: Eu{sup 3+} phosphors making Mg{sub 0.6}Ca{sub 2.16}Mo{sub 0.2}W{sub 0.8}O{sub 6}: Eu{sub 0.12}{sup 3+}/Na{sub 0.12}{sup +} prime candidates for fabrication of warm white phosphor-converted LEDs. - Highlights: • LED excitable Mg{sub 0.6}Ca{sub 2.16}Mo{sub 0.2}W{sub 0.8}O{sub 6}: Eu{sub 0.12}{sup 3+}/Na{sub 0.12}{sup +} phosphors were synthesized. • These phosphors are 10 times more intense than CaMoO{sub 4}: Eu{sup 3+} red phosphors. • Their intensity and efficiency were enhanced by materials optimization techniques. • Such techniques include compositional alloying, charge compensation, etc.

  12. Determination of the micro-nutrient elements and the toxic in food of peruvian children of the city of Lima. Part I: determination through instrumental neutron activation of Ca, Cl, K, Mg and Na in samples of milk and milk with cereal consumed by peruvian children in the age of weaning

    International Nuclear Information System (INIS)

    Montoya R, E.; Bedregal, P.; Diaz, A.; Zavaleta, N.; Berlanga, R.

    1993-01-01

    The contents of Ca, Cl, K, Mg and Na in milk and milk with cereal, consumed by the peruvian children were determined by short irradiation INAA using RP-10 reactor, with a thermal flux of 10 13 n/cm -2 s -1 and a pneumatic system. The comparative method with solutions of primary standards of each element determined was used. The IAEA-A11-milk powder, IAEA-H4-animal muscle and IAEA-V10-hay powder, reference materials were periodically analyzed, together with the samples, in order to check the quality of analytical results. (authors) 3 refs., 3 tabs, 2 figs

  13. Caracterización biológica empleando células osteobláticas de vidrios del sistema SiO2. Na2O. CaO. K2O. MgO. P2O5. Modificados con Al2O3 y B2O3.

    OpenAIRE

    Noris Suarez, K.; Barrios de Arenas, I; Vasquez, M.; Baron, Y.; Atias, I.; Bermudez, J.; Morillo, C.; Olivares, Y.; Lira, J.

    2003-01-01

    Desde hace al menos cuatro décadas se han ido desarrollando materiales cerámicos que permiten reproducir funciones de los organismos vivos, entre los que se destacan los vidrios denominados bioactivos. Definidos así, por su capacidad de proporcionar una respuesta biológica específica en la interfase del material que resulta en la unión química entre el material y el tejido óseo. En el presente trabajo se evaluó la compatibilidad de cinco biovidrios del sistema SiO 2 .Na 2 O.CaO.K 2 O.MgO.P 2 ...

  14. Alterations of Mg2+ After Hemorrhagic Shock.

    Science.gov (United States)

    Lee, Mun-Young; Yang, Dong Kwon; Kim, Shang-Jin

    2017-11-01

    Hemorrhagic shock is generally characterized by hemodynamic instability with cellular hypoxia and diminishing cellular function, resulting from an imbalance between systemic oxygen delivery and consumption and redistribution of fluid and electrolytes. Magnesium (Mg) is the fourth most abundant cation overall and second most abundant intracellular cation in the body and an essential cofactor for the energy production and cellular metabolism. Data for blood total Mg (tMg; free-ionized, protein-bound, and anion-bound forms) and free Mg 2+ levels after a traumatic injury are inconsistent and only limited information is available on hemorrhagic effects on free Mg 2+ as the physiologically active form. The aim of this study was to determine changes in blood Mg 2+ and tMg after hemorrhage in rats identifying mechanism and origin of the changes in blood Mg 2+ . Hemorrhagic shock produced significant increases in blood Mg 2+ , plasma tMg, Na + , K + , Cl - , anion gap, partial pressures of oxygen, glucose, and blood urea nitrogen but significant decreases in RBC tMg, blood Ca 2+ , HCO 3 - , pH, partial pressures of carbon dioxide, hematocrit, hemoglobin, total cholesterol, and plasma/RBC ATP. During hemorrhagic shock, K + , anion gap, and BUN showed significant positive correlations with changes in blood Mg 2+ level, while Ca 2+ , pH, and T-CHO correlated to Mg 2+ in a negative manner. In conclusion, hemorrhagic shock induced an increase in both blood-free Mg 2+ and tMg, resulted from Mg 2+ efflux from metabolic damaged cell with acidosis and ATP depletion.

  15. The Influence of the Asymmetric Arb Process on the Properties of Al-Mg-Al Multi-Layer Sheets / Wpływ Asymetrii W Procesie Arb Na Właściwości Wielowarstwowych Blach Al-Mg-Al

    Directory of Open Access Journals (Sweden)

    Wierzba A.

    2015-12-01

    Full Text Available The paper presents the results of the experimental study of the three-layer Al-Mg-Al sheets rolling process by the ARB method. The tests carried out were limited to single-pass symmetric and asymmetric rolling processes. An Al-Mg-Al package with an initial thickness of 4 mm (1-2-1 mm was subjected to the process of rolling with a relative reduction of 50%. To activate the shear band in the strip being deformed, an asymmetry factor of av=2 was applied. From the test results, an increase in the tensile strength of the multi-layer Al-Mg-Al sheets obtained from the asymmetric process was observed. Microhardness tests did not show any significant differences in aluminium layer between respective layers of sheets obtained from the symmetric and the asymmetric process. By contrast, for the magnesium layer, an increase in microhardness from 72 HV to 79 HV could be observed for the asymmetric rolling. The analysis of the produced Al-Mg-Al sheets shows that the good bond between individual layers and grain refinement in the magnesium layer contributed to the obtaining of higher mechanical properties in the multi-layer sheets produced in the asymmetric process compared to the sheets obtained from the symmetric process.

  16. Fenologia reprodutiva de espécies de bromélias na Serra da Piedade, MG, Brasil Reproductive phenology of bromeliad species at Serra da Piedade, Minas Gerais State, Brazil

    Directory of Open Access Journals (Sweden)

    Andréa Rodrigues Marques

    2008-06-01

    Full Text Available O presente trabalho objetivou caracterizar a fenologia reprodutiva das espécies de Bromeliaceae da Serra da Piedade. Das dezoito espécies estudadas, 72% floresceram na estação chuvosa e 28% na estação seca. Observou-se que a floração das bromélias ao longo do gradiente altitudinal da Serra da Piedade foi seqüencial e influenciada pela sazonalidade das chuvas. A maioria das espécies que ocorrem no habitat xérico pedregoso (acima de 1.400 m de altitude apresentou a floração na estação chuvosa, enquanto que três das cinco espécies que ocorrem no ambiente mésico florestal (abaixo de 1.300 m de altitude floresceram na estação seca. Espécies simpátricas com características florais semelhantes, como Tillandsia stricta, T. gardneri, Vriesea crassa e V. citrina, também apresentaram floração seqüencial. A dispersão das espécies com sementes aladas (Pitcairnoideae e plumosas (Tillandsioideae ocorreu na estação seca, exceto para Dyckia saxatilis e Racinaea aerisincola. Foi observada assincronia na maturação dos frutos e dispersão das sementes entre as bromélias zoocóricas. É provável que essas condições permitam às espécies de bromélias da Serra da Piedade evitar a sobreposição do uso de animais vetores de pólen e de sementes.This work characterizes the phenology of Bromeliaceae species at Serra da Piedade. Of the i8 species studied, 72% flowered in the rainy season and 28% in the dry season. We observed sequential flowering of bromeliads along the entire altitudinal gradient at Serra da Piedade; flowering was also influenced by rainfall seasonality. Most species that occur in the rocky xeric habitat (above 1400 m altitude flowered during the rainy season, while three of the five species found in the mesic forest (below 1300 m altitude flowered in the dry season. Sympatric species with similar floral characteristics, such as Tillandsia stricta, T. gardneri, Vriesea citrina and V. crassa, also flowered

  17. OGLAŠEVANJE NA FACEBOOKU V SLOVENIJI

    OpenAIRE

    Dobnik, Monja

    2013-01-01

    Danes so zahvaljujoč napredni mobilni tehnologiji družbena omrežja z nami na vsakem koraku. Facebook (FB) se po priljubljenosti uvršča v sam vrh družbenih omrežij in glede na to, da ga uporablja že več kot milijarda zemljanov, ponuja tudi odlične trg za oglaševanje. To so ugotovili tudi slovenski podjetniki. V diplomski nalogi je predstavljeno, kako na FB oglašujejo nekatera slovenska podjetja, s pomočjo spletnega vprašalnika pa je ugotovljeno tudi, kaj o oglasih na FB menijo njegovi uporabni...

  18. Structural and magnetic properties of Ni{sub 0.15}Mg{sub 0.1}Cu{sub 0.3}Zn{sub 0.45}Fe{sub 2}O{sub 4} ferrite prepared by NaOH-precipitation method

    Energy Technology Data Exchange (ETDEWEB)

    Hou, Wei-xiao; Wang, Zhi, E-mail: zhiwang@tju.edu.cn

    2015-09-15

    Highlights: • NiMgCuZn ferrites were successfully prepared by low-temperature sintering. • NiMgCuZn ferrites have the advantages of both NiCuZn and MgCuZn ferrites. • NiMgCuZn ferrites exhibit high Curie temperature & high stability of permeability. - Abstract: The Ni{sub 0.15}Mg{sub 0.1}Cu{sub 0.3}Zn{sub 0.45}Fe{sub 2}O{sub 4} ferrite powders have been prepared by NaOH co-precipitation method and characterized by X-ray diffraction (XRD) and vibrating sample magnetometer (VSM). The XRD patterns confirm the single phase spinel structure of synthesized nanoparticles. The average crystallite size of the particles increases from 12 to 36 nm with calcining temperature (T{sub a}) from 500 to 800 °C. The saturation magnetization (M{sub s}) of the superparamagnetic particles was deduced by Langevin theory. Subsequently, the densification characteristics and magnetic properties of the low-temperature 950 °C-sintered ferrite bulk samples were also investigated. The magnetic measurement showed that the sintered bulk sample of T{sub a} = 600 °C has the highest initial permeability (μ{sub i}), lowest coercivity (H{sub c}), largest saturation magnetization (M{sub s}) and satisfactory thermal stability of μ{sub i}. The microstructures of sintered samples were examined using field emission scanning electric microscope (FESEM). The T{sub a} has significant influence on the bulk density, initial permeability, saturation magnetization and coercivity of Ni{sub 0.15}Mg{sub 0.1}Cu{sub 0.3}Zn{sub 0.45}Fe{sub 2}O{sub 4} ferrite.

  19. Influence of Age Hardening Parameters on the Microstructure and Properties of the AlSi7Mg Sand Cast Alloy / Wpływ Parametrów Utwardzania Wydzieleniowego Na Strukturę I W Łaściwości Stopu Alsi7mg

    Directory of Open Access Journals (Sweden)

    Poloczek Ł.

    2015-12-01

    Full Text Available Aluminium alloys are characterized by a low density, acceptable mechanical properties and good technological properties. This unique connection of features made aluminium alloys perfect structural material for the transportation industry. Also, due to their good electrical conductivity they also found application in energy production industry. High mechanical properties and electrical conductivity of the Al-Si alloys with Mg addition may be achieved by heat treatment. However, the highest mechanical properties are achieved in the early stages of age hardening - due to precipitation of coherent phases, while high electrical conductivity may be achieved only by prolonged aging, during precipitation of semi-coherent or fully noncoherent, coarse phases. Carefully heat treated AlSi7Mg alloy may exhibit both fairly high electrical conductivity and slightly increased mechanical properties. The following article present results of the research of influence of heat treatment on the properties and microstructure of sand cast AlSi7Mg alloy. Microstructure observations were performed using light microscopy, scanning electron and scanning-transmission electron microscopy. Hardness and electrical conductivity of the AlSi7Mg alloy were investigated both in as-cast condition and after heat treatment. Maximum hardness of the alloy is achieved after solutioning at 540°C for 8h, followed by 72h of aging at 150°C, while maximal electrical conductivity after solutioning at 540°C for 48h, followed by 96h of aging at 180°C. Increase of the electrical conductivity is attributed to increasing distance between Si crystals and precipitation of semi coherent phases.

  20. Cross section analyses in MiniBooNE and SciBooNE experiments

    OpenAIRE

    Katori, Teppei

    2013-01-01

    The MiniBooNE experiment (2002-2012) and the SciBooNE experiment (2007-2008) are modern high statistics neutrino experiments, and they developed many new ideas in neutrino cross section analyses. In this note, I discuss selected topics of these analyses.

  1. MicroBooNE: The Search For The MiniBooNE Low Energy Excess

    Energy Technology Data Exchange (ETDEWEB)

    Kaleko, David [Columbia Univ., New York, NY (United States)

    2017-01-01

    This thesis describes work towards the search for a low energy excess in MicroBooNE. What MicroBooNE is, what the low energy excess is, and how one searches for the latter in the former will be described in detail.

  2. Práticas de segregação e resistência nas organizações: uma análise discursiva sobre os “rolezinhos” na cidade de Belo Horizonte (MG

    Directory of Open Access Journals (Sweden)

    Marco César Ribeiro Nascimento

    2016-02-01

    Full Text Available Objetivo: O objetivo do artigo é compreender como os discursos da mídia eletrônica apresentam reflexos e refrações das práticas de resistência dos jovens nos espaços organizacionais dos shopping centers. Essas práticas são denominadas atualmente “rolezinhos”. Originalidade/lacuna/relevância/implicações: Considerando os espaços urbanos produzidos socialmente e as cidades como palcos práticos e discursivos de dinâmicas simbólicas segregatórias, analisamos os processos de ocupação dos shopping centers – intitulados pela mídia eletrônica de “rolezinhos” – na cidade de Belo Horizonte, em Minas Gerais, por jovens da periferia. Principais aspectos metodológicos: Adotamos a análise de discurso francesa como base metodológica da pesquisa. O corpus de análise é constituído por discursos presentes em 15 portais eletrônicos de notícias sobre a cidade de Belo Horizonte, em Minas Gerais, que produziram, durante o ano de 2013, 18 reportagens sobre a ocupação coletiva de shopping centers por jovens da periferia. Síntese dos principais resultados: As práticas de resistência ampliam as fronteiras dos espaços organizacionais, na medida em que deslocam pontos de controle das ações dos sujeitos e questionam a construção do shopping center como espaço organizacional de segregação avesso a grupos sociais desfavorecidos, enfatizando o potencial de resistência e de ressignificação de grupos marginalizados nessas organizações. Principais considerações/conclusões: Entendemos os “rolezinhos” como questionamento dos limites do espaço organizacional que produziram deslocamentos das fronteiras das organizações. Eles são efeitos de alterações de relações de forças socioeconômicas que estavam na rua e, quando expandidas para espaços organizacionais, provocaram tensões que continuam latentes, pois a rua continua sua dinâmica e novamente questionará essas fronteiras.

  3. Mapeamento e análise do uso e ocupação do solo na bacia do rio vieira no município de Montes Claros/MG

    OpenAIRE

    Adriana Aparecida Moreira; Fernando Hiago Souza Fernandes; César Vinícius Mendes Nery

    2014-01-01

    Com o uso das geotecnologias é possível identificar o potencial que evoluem as mudanças temporais de um espaço físico-territorial. No presente trabalho buscou-se avaliar as mudanças do uso e ocupação do solo na Bacia do Rio Vieira entre um espaço temporal de três anos. Para a verificação das alterações ocorridas do mapeamento realizado por Leite et al. (2011), foi utilizado a mesma base metodológica para o ano de 2012, com classificação supervisionada, pixel a pixel, algoritmo de  máxima vero...

  4. Effects of limestone, N, K and Mg fertilizers on Mg absorption by oats and barley

    Energy Technology Data Exchange (ETDEWEB)

    Alston, A M

    1966-01-01

    Oats grown in a pot experiment on two sandy loams were sampled at four stages of growth. Neither KCl nor MgSO/sub 4/. 7H/sub 2/O had any effect on yield but % Mg and total Mg uptake were consistently decreased by applying K and increased by applying Mg. Ca(NO/sub 3/)/sub 2/ increased % Mg more than did (NH/sub 4/)/sub 2/SO/sub 4/, but yield and total Mg uptake were higher where (NH/sub 4/)/sub 2/SO/sub 4/ was applied. The effects of fertilizers were similar on both soils. The effects of applying (NH/sub 4/)/sub 2/SO/sub 4/ and NaNO/sub 2/ to the soil on % Mg in barley were compared in a field experiment on an acid loam to which several rates of limestone had been applied. Treatments had no effect on the % Mg in grain or straw at maturity. At four earlier stages of growth (NH/sub 4/)/sub 2/SO)/sub 4/ increased % Mg in the plants more than did NaNO/sub 2/. Limestone slightly increased % Mg. Nitrification of NH/sub 4/ in the soil was rapid.

  5. ANÁLISE DA INFLUÊNCIA LITOLÓGICA E ESTRUTURAL A PARTIR DE MÉTODOS MORFOMÉTRICOS EM SEGMENTOS DE DRENAGEM NA PORÇÃO CIMEIRA DA BACIA HIDROGRÁFICA DO RIO JEQUITINHONHA, MG

    Directory of Open Access Journals (Sweden)

    Fabrício Antonio Lopes

    2016-06-01

    Full Text Available O estudo do padrão de drenagem da porção cimeira da bacia hidrográfica do Jequitinhonha foi realizado neste trabalho tendo como objetivos: a Correlacionar as direções dos canais fluviais e respectivas ordens hierárquicas às estruturas geológicas regionais; b Verificar o grau de influência dos aspectos litológicos e estruturais no padrão de drenagem da bacia e; c Identificar estruturas que atuam como níveis de base locais em perfis longitudinais. Foram empregadas análises quantitativas de tratamento de direção dos canais fluviais e ordens hierárquicas, cálculo do índice de RDE em segmentos pré-selecionados e análise de perfis longitudinais. Constatou-se significativa influência litológica e estrutural no padrão/direção dos canais fluviais identificadas como nick points nos perfis longitudinais. Há segmentos de drenagem com anomalias de primeira e segunda ordem quanto ao índice RDE, o que reforça a influência das estruturas pré-cambrianas, reativadas no Cenozoico, no sistema hidrográfico da região. Acredita-se na potencialidade deste estudo como auxilio na caracterização, quantificação e fundamentação teórica de análises referentes ao processo evolutivo da paisagem e ao comportamento da rede de drenagem local.

  6. Primeiro encontro de Lutzomyia longipalpis (Lutz & Neiva, 1912 na área urbana de Uberlândia, MG, concomitante com o relato de primeiro caso autóctone de leishmaniose visceral humana First finding of Lutzomyia longipalpis (Lutz & Neiva, 1912 in the urban area of Uberlândia, MG, concomitant with the first reported autochthonous case of human visceral leishmaniasis

    Directory of Open Access Journals (Sweden)

    Márcia Beatriz Cardoso de Paula

    2008-06-01

    Full Text Available Relata-se a primeira ocorrência do vetor da leishmaniose visceral, Lutzomyia longipalpis, na área urbana de Uberlândia, estado de Minas Gerais e o primeiro caso de leishmaniose visceral humana autóctone no município, notificado ao Centro de Controle de Zoonoses, por meio da Vigilância Epidemiológica da Secretaria Municipal de Saúde. Discute-se a importância deste encontro na transmissão da doença nessa área.The first occurrence of the vector for visceral leishmaniasis, Lutzomyia longipalpis, in the urban area of Uberlândia, State of Minas Gerais, and the first autochthonous case of human visceral leishmaniasis recorded in the same locality are reported. These were notified to the Zoonosis Control Center, through the Epidemiological Surveillance sector of the Municipal Health Department. The importance of these findings regarding transmission of the disease in this area is discussed.

  7. Nuclear structure calculations in $^{20}$Ne with No-Core Configuration-Interaction model

    OpenAIRE

    Konieczka, Maciej; Satuła, Wojciech

    2016-01-01

    Negative parity states in $^{20}$Ne and Gamow-Teller strength distribution for the ground-state beta-decay of $^{20}$Na are calculated for the very first time using recently developed No-Core Configuration-Interaction model. The approach is based on multi-reference density functional theory involving isospin and angular-momentum projections. Advantages and shortcomings of the method are briefly discussed.

  8. PRIMERJALNA ANALIZA STROŠKOV DELA V SLOVENIJI GLEDE NA VRSTE ZAPOSLITEV

    OpenAIRE

    Krošel, Marina

    2015-01-01

    V času, ko gospodarstvu posel ne gre najbolje, ko se trgi spreminjajo mesečno, ko se letnih planov ne da z gotovostjo napovedovati, ko ne le, da se dobički manjšajo, ampak jih več sploh ni, je trg dela pomembna komponenta varčevanja v gospodarstvu. V tem času na trg dela vstopam tudi sama. Kakšno obliko zaposlitve naj pričakujem? Katera je za delodajalca najbolj sprejemljiva? Kakšna je zakonodaja na tem področju? Ali me varuje Zakon o delovnih razmerjih? Kolektivna pogodba? Sindikati? Kaj ...

  9. Reaction cross section for Ne isotopes

    International Nuclear Information System (INIS)

    Panda, R.N.; Sahu, B.K.; Patra, S.K.

    2012-01-01

    In the present contribution, first the bulk properties are calculated, such as binding energy (BE), root mean square charge radius r ch , matter radius r m and quadrupole deformation parameter β 2 for 18-32 Ne isotopes in the Relativistic mean field (RMF) and effective field theory motivated RMF (E-RMF) formalisms . Then the total nuclear reaction cross section σR is analyzes for the scattering of 20 Ne and 28-32 Ne from a 12 C target at 240 MeV/nucleon by using the RMF model. Thus the objective of the present study is to calculate the bulk properties as well as a systematic analysis of σR over a range of neutron rich nuclei in the frame work of Glauber model

  10. Encruzilhadas da participação popular na modernização das políticas públicas de segurança: uma análise do CONSEP em Brumadinho (MG = Intersections of popular participation in the modernization of public security policies: an analysis of the CONSEP in Brumadinho (MG

    Directory of Open Access Journals (Sweden)

    Ribeiro, Ludmila Mendonça Lopes

    2011-01-01

    Full Text Available A proposta deste trabalho é analisar os Conselhos Comunitários de Segurança Pública (CONSEPs como esferas de aproximação entre polícia e comunidade e, por conseguinte, reorganização de estruturas tradicionalmente hierárquicas pela via da inserção da participação popular na gestão de políticas públicas. O tema da participação popular na gestão de políticas públicas emergiu como foco de análise das ciências sociais brasileira especialmente após a conformação de conselhos municipais, que procuram aproximar dos cidadãos dos gestores de políticas públicas. No caso específico da segurança pública, a motivação para o engajamento dos cidadãos nas políticas públicas adquire conotação mais incisiva frente ao crescimento dos níveis de criminalidade no país. O presente trabalho tomou como estudo de caso o Conselho Municipal de Segurança Pública de Brumadinho, município da Região Metropolitana de Belo Horizonte, uma vez que nesta realidade se encontram presentes elementos relevantes para a compreensão da complexa interação entre os atores sociais e agentes públicos nos canais de participação popular e seus rebatimentos na construção de políticas públicas, abrindo, desta forma, a possibilidade de se discutir, simultaneamente, os meandros da participação popular e o rearranjo das estruturas públicas tradicionalmente responsáveis pela gestão das políticas de segurança

  11. Análise comparativa das características da serrapilheira e do solo em cafezais (Coffea arabica L. cultivados em sistema agroflorestal e em monocultura, na Zona da Mata MG Comparative analysis of litter and soil characteristics under coffee (Coffea arabica L. crop in agroforestry and monoculture systems

    Directory of Open Access Journals (Sweden)

    Mônica Matoso Campanha

    2007-10-01

    Full Text Available O aporte de serrapilheira em sistemas agroflorestais pode melhorar as características químicas e físicas do solo, diminuir a erosão e permitir a manutenção da umidade no solo por mais tempo. Isso faz dele um sistema alternativo de produção de café em regiões com solos propensos à degradação. Este trabalho teve como objetivo realizar uma análise comparativa da quantidade e teor de nutrientes da serrapilheira e das características de fertilidade e do teor de umidade dos solos, em cafeeiros cultivados sob sistemas agroflorestal e solteiro. A pesquisa foi realizada na Zona da Mata mineira, durante o período compreendido entre janeiro de 1999 e maio de 2000. O sistema agroflorestal contribuiu com 6,1 Mg ha-1 ano-1 de matéria seca de serrapilheira, no entanto o solteiro aportou 4,5 Mg ha-1 ano-1, ressaltando-se que esta última apresentou teor mais elevado de macronutrientes. O solo do sistema agroflorestal exibiu maior teor de umidade de 20-40 cm, maior capacidade de troca de cátions e soma de bases trocáveis, maior teor de K, Ca, Mg, Cu e Zn em ambos os horizontes do solo e menor índice de saturação de alumínio e alumínio trocável na camada mais profunda do que o solo sob a monocultura. No cultivo solteiro, o solo apresentou maior teor de P e de matéria orgânica, tanto na camada superficial quanto na profunda.Coffee plants in agroforestry systems is an alternative to full sunlight cultivation, presenting the potential benefits of enhancing soil chemical and physical characteristics, reducing soil erosion, besides maintaining soil moisture for longer periods. This research aimed at comparing the quantity and nutrient concentration in the litter, soil fertility and soil moisture in coffee crops under full sunlight monocrop and in agroforestry systems, at the Zona da Mata, Minas Gerais, Brazil. The research was carried out between January 1999 and May 2000. The agroforestry system, contributed with 6.1 Mg ha-1 year-1 of

  12. Sintering of (Ni,Mg)(Al,Fe)2O4 Materials and their Corrosion Process in Na3AlF6-AlF3-K3AlF6 Electrolyte

    Science.gov (United States)

    Xu, Yibiao; Li, Yawei; Yang, Jianhong; Sang, Shaobai; Wang, Qinghu

    2017-06-01

    The application of ledge-free sidewalls in the Hall-Héroult cells can potentially reduce the energy requirement of aluminum production by about 30 pct (Nightingale et al. in J Eur Ceram, 33:2761-2765, 2013). However, this approach poses great material challenges since such sidewalls are in direct contact with corrosive electrolyte. In the present paper, (Ni,Mg)(Al,Fe)2O4 materials were prepared using fused magnesia, reactive alumina, nickel oxide, and iron oxide powders as the starting materials. The sintering behaviors of specimens as well as their corrosion resistance to molten electrolyte have been investigated by means of X-ray diffraction and scanning electron microscope. The results show that after firing at temperature ranging from 1673 K (1400 °C) up to 1873 K (1600 °C), all the specimens prepared are composed of single-phase (Ni,Mg)(Al,Fe)2O4 composite spinel, the lattice parameter of which increases with increasing Fe3+ ion concentration. Increasing the iron oxide content enhances densification of the specimens, which is accompanied by the formation of homogeneously distributed smaller pores in the matrix. The corrosion tests show that corrosion layers consist of fluoride and Ni(Al,Fe)2O4 composite spinel grains are produced in specimens with Fe/Al mole ratio no more than 1, whereas dense Ni(Al,Fe)2O4 composite spinel layers are formed on the surface of the specimens with Fe/Al mole ratio more than 1. The dense Ni(Al,Fe)2O4 composite spinel layers formed improve the corrosion resistance of the specimens by inhibiting the infiltration of electrolyte and hindering the chemical reaction between the specimen and electrolyte.

  13. INFLUÊNCIA DOS FATORES GEOLÓGICOS, GEOMORFOLÓGICOS E ANTRÓPICOS DA PRODUÇÃO DE FLUXO DE BASE EM PEQUENAS BACIAS HIDROGRÁFICAS NA APA CACHOEIRA DAS ANDORINHAS, OURO PRETO (MG

    Directory of Open Access Journals (Sweden)

    Josefa Clara Monteiro

    2014-08-01

    Full Text Available Neste trabalho objetivou-se estabelecer a influência da geologia, geomorfologia e uso e ocupação do solo no potencial hídrico de pequenas bacias hidrográficas situadas na Área de Proteção Ambiental Estadual da Cachoeira das Andorinhas (APA/CA. Foram selecionados três pares de bacias, cada par com condições geológicas e geomorfológicas semelhantes, mas com graus distintos de interferência antrópica. Utilizando-se dados de chuva e vazão, obtidos durante um ano hidrológico, estabeleceram-se os regimes pluviométricos e fluviométricos e determinaram-se alguns parâmetros hidrológicos, como o fluxo de base pela técnica smoothed mínima e o coeficiente de recessão (α pela técnica matching strip. A análise conjugada destes parâmetros, de índices morfométricos e de dados físico-químicos das águas indicam que as bacias em áreas de relevo mais suave tendem a apresentar menores coeficientes de recessão e maiores volumes de fluxo de base. Portanto, nestas áreas o potencial hídrico é maior, já que a vazão das drenagens se mantém por mais tempo na estação seca. O relevo mais suave, com solo mais espesso e maior tempo de trânsito das águas subterrâneas, também justificam as águas mais redutoras e com maiores condutividades elétricas. Os dados também sugerem que as bacias da área com maiores proporções de florestas tendem a apresentar menores fluxos de base por conta das maiores taxas de evapotranspiração. Os métodos aplicados se mostraram adequados para caracterizar o regime hídrico de pequenas bacias hidrográficas e podem ser importantes para a gestão de recursos hídricos.

  14. Trocas gasosas de cafeeiros (Coffea arabica L. e seringueiras (Hevea brasiliensis Muell. Arg. em diferentes sistemas de cultivo na região de larvas, MG Gas exchange in coffe (Coffea arabica L. and rubber tree (Hevea brasiliensis Muell. Arg. in different crop systems in lavras, MG

    Directory of Open Access Journals (Sweden)

    Cláudio Roberto Meira de Oliveira

    2006-04-01

    Full Text Available O uso de sistemas de cultivo agrícola que favorecem a conservação dos recursos naturais e a diversidade de produção representa uma alternativa para produtores que visam menores custos em uma produção sustentável. Dentre esses sistemas de cultivo, destaca-se o sistema de consórcio entre cafeeiros e seringueiras, que tem sido estudado na região sul de Minas Gerais. Nesse contexto, avaliaram-se características de trocas gasosas, fluorescência da clorofila e relações hídricas de cafeeiros e seringueiras, em monocultivo e consórcio, na fase de implantação dos cultivos, com o objetivo de verificar o comportamento dessas espécies em diferentes sistemas de cultivo. Os resultados apontaram que um ambiente caracterizado por níveis de radiação e temperatura menores favorece as trocas gasosas do cafeeiro, enquanto maior disponibilidade hídrica e valores elevados de radiação são favoráveis ao desenvolvimento da seringueira quando em sistemas consorciados.Crop systems that improve conservation of natural resources and diversity of production is a promising practice for farmers seeking low costs and a sustainable agriculture. The coffee - rubber tree intercropping has been studied in the south of Minas Gerais - Brazil. Within this context, the objective of this work was to evaluate the characteristics gas exchange, chlorophyll fluorescence and water relations of coffee and rubber tree in both intercropping and monocroping systems, in the early stage of the plantation establishment. The results showed that the reduction in radiation levels and temperature promote gas exchange increase in coffee, while higher photosynthetic radiation values and soil water availability are favorable to rubber tree in intercropping systems.

  15. Assessment of CaSO{sub 4}:Dy and LiF:Mg,Ti thermoluminescent dosimeters performance in the dosimetry of clinical electron beams; Avaliacao do desempenho dos detectores termoluminesncetes de CaSO{sub 4}:Dy e LiF:Mg,Ti na dosimetria de feixes clinicos de eletrons

    Energy Technology Data Exchange (ETDEWEB)

    Nunes, Maira Goes

    2008-07-01

    The assessment of the performance of CaS0{sub 4}:Dy thermoluminescent detectors produced by IPEN in the dosimetry of clinical electron beams aims to propose an alternative to the LiF:Mg,Ti commercial dosimeters (TLD-100) largely applied in radiation therapy. The two types of thermoluminescent dosimeters were characterised with the use of PMMA, RMI-457 type solid water and water phantoms in radiation fields of 4, 6, 9, 12 and 16 MeV electrons of nominal energies in which the dose-response curves were obtained and the surface and depth doses were determined. The thermoluminescent response dependency with the electron nominal energies and the applied phantom were studied. The CaS0{sub 4}:Dy presented the same behaviour than the LiF:Mg,Ti in such a way that its application as an alternative to the TLD-100 pellets in the radiation therapy dosimetry of electron beams is viable and presents the significantly higher sensitivity to the electron radiation as its main advantage. (author)

  16. Strateški marketing za popularizacijo ritmične gimnastike

    OpenAIRE

    Möderndorfer, Tjaša

    2018-01-01

    Uvodoma smo predstavili in preučili ključne pojme za lažje razumevanje trženjskih osnov. V nadaljevanju predstavimo metode in tehnike, ki nam pomagajo pri raziskovanju in posledično pri določanju trga in ciljev. Predstavljeni so nekateri osnovni modeli, ki nam pomagajo razumeti, kako trg deluje in kaj vse vpliva nanj. Naša tema se nanaša na šport, zato si v nadaljevanju pogledamo delovanje športnih organizacij. Za pripravo strategije trženja pregledamo okolje in vse deležnike, ki so pos...

  17. Mapeamento e análise do uso e ocupação do solo na bacia do rio vieira no município de Montes Claros/MG

    Directory of Open Access Journals (Sweden)

    Adriana Aparecida Moreira

    2014-10-01

    Full Text Available Com o uso das geotecnologias é possível identificar o potencial que evoluem as mudanças temporais de um espaço físico-territorial. No presente trabalho buscou-se avaliar as mudanças do uso e ocupação do solo na Bacia do Rio Vieira entre um espaço temporal de três anos. Para a verificação das alterações ocorridas do mapeamento realizado por Leite et al. (2011, foi utilizado a mesma base metodológica para o ano de 2012, com classificação supervisionada, pixel a pixel, algoritmo de  máxima verossimilhança (MAXVER e limiar de aceitação de 99,99%, sendo definidas as seguintes classes; área urbana, cultura agrícola, mineração, recursos hídricos, pastagem, silvicultura, vegetação natural e outros. Dentre as mudanças sofridas por essa bacia no intervalo de três anos, pode-se perceber aumento de uso do solo para atividade minerária e de silvicultura, além de contínuo uso para pastagem, uma vez que a região tem a agropecuária como uma atividade economicamente representativa.

  18. FITOTERAPIA E HOMEOPATIA ATRAVÉS DA EXTENSÃO UNIVERSITÁRIA NO SUDESTE MINEIRO: PROPOSTAS ALTERNATIVAS PARA A SAÚDE RURAL E AGRICULTURA FAMILIAR NA REGIÃO DE MURIAÉ, MG

    Directory of Open Access Journals (Sweden)

    Montcharles Silva PONTES

    2015-12-01

    Full Text Available O presente trabalho apresenta uma análise do “Programa de Extensão e Divulgação da Homeopatia, Plantas Medicinais e Agricultura Orgânica”, idealizado pela Universidade Federal de Viçosa, realizados em conjunto com o Centro Alternativo de Formação Popular Rosa Fortini e a Associação dos Terapeutas Holísticos e Integrativos da Zona da Mata Mineira (ATHI, nos cursos de extensão e eventos sobre plantas medicinais, terapias alternativas, alimentação orgânica e homeopatia realizados na região sudeste de Minas Gerais, no município de Muriaé, no período de 2008-2011. Por meio da pesquisa participativa em unidades agrícolas familiares que inseriram a homeopatia no seu manejo agrícola, é possível identificar diversos indicadores ambientais representativos da ação direta e/ou indireta das homeopatias. O trabalho realizado vem obtendo resultados positivos quanto à interação dos alunos com o meio ambiente, no uso de homeopatia popular nas propriedades rurais, focando no aprendizado sobre as plantas e a saúde rural com um ponto de vista mais abrangente.

  19. Indicadores de campo para solos hidromórficos na região de Viçosa (MG Field indicators for the identification of hydromorphic soils in the region of Viçosa, Minas Gerais - Brazil

    Directory of Open Access Journals (Sweden)

    C. E. B. Campos

    2003-12-01

    Full Text Available Indicadores locais são úteis para a identificação de ambientes. Na região de Viçosa, embora os solos encharcados ocorram sob vegetação de taboa (Thypha dominguensis, Gleissolos, de coloração típica acinzentada, são incomuns. A maioria dos solos com lençol freático alto é coberta pela taboa e as características gleizadas do solo são pouco pronunciadas, especialmente nos solos com mais altos teores de ferro. Não há clara conexão entre altura do lençol freático e deficiência de oxigênio. Como as relações entre altura do lençol freático, deficiência de oxigênio e cor do solo não são claras o bastante, hipotetizou-se que outros indicadores para as condições de redução poderiam ser encontrados nesses ambientes. Neste propósito, caracterizou-se o solo e trabalhou-se na sua relação com a vegetação. Estudaram-se os solos com várias intensidades de condições de drenagem em três áreas: Cajuri (Área 1, Viçosa (Área 2 e Coimbra (Área 3, todas pertencentes ao Planalto de Viçosa. Na avaliação das condições de redox dos solos (pH e pE a campo, utilizou-se um medidor digital adaptado a uma sonda de aço. Conquanto importante na identificação de indicadores de ambientes, a caracterização morfológica não se mostrou precisa o bastante para evidenciar o que os solos encharcados têm mais em comum: a deficiência de oxigênio por longos períodos. A cor, embora seja um bom e útil indicador para muitas das condições de drenagem do solo, não se mostrou também eficiente nessas áreas. De modo geral, os Gleissolos estudados apresentaram cromas maiores do que dois, o que supera o limite do critério para identificar horizonte glei no Sistema Brasileiro de Classificação de Solos, embora o teste indicador da presença de Fe2+ com alfa,alfa'-dipiridil tenha sido positivo. Por outro lado, a presença da taboa foi um bom indicador das condições de má drenagem. Nos locais dos povoamentos puros de taboa, os

  20. Tendências e perspectivas da administração em enfermagem: Um estudo na Santa Casa de Belo Horizonte-MG Tendencias y perspectivas de la administración en enfermería un estudio en la Santa Casa de Belo Horizonte-MG Trends and perspectives of nursing administration: a study in the "Santa Casa" Hospital of Belo Horizonte-MG, Brazil

    Directory of Open Access Journals (Sweden)

    Carla Aparecida Spagnol

    2002-01-01

    Full Text Available A Santa Casa de Belo Horizonte implantou um novo Sistema de Gestão que a caracterizou como uma organização flexível. Partindo desse contexto, delineamos como objetivos deste estudo: analisar a forma da administração em enfermagem, considerando a implantação do SIGESC; descrever como a equipe de enfermagem percebe a comunicação, o processo decisório e as relações interpessoais; identificar possíveis tendências e perspectivas presentes na prática administrativa desenvolvida. Evidenciamos um momento de transição da administração em enfermagem que apresenta traços da gerência clássica e da gerência contemporânea. Entretanto, sinalizamos tendências e perspectivas que poderão contribuir para a reorganização do processo de trabalho da enfermagem na área hospitalar.La Santa Casa de Belo Horizonte, implantó un nuevo Sistema de Gestión, caracterizándose como una organización flexible. Partiendo de este contexto, delimitamos como objetivos: analizar la forma de administración en enfermería, considerando la implementación del SIGESC; describir como el equipo de enfermería percibe la comunicación, el proceso de toma de decisiones y las relaciones interpersonales; identificar posibles tendencias y perspectivas presentes en la práctica administrativa desarrollada. Evidenciamos un momento de transición de la administración en enfermería que presenta trazos de la gerencia clásica y de la gerencia contemporánea. Por ahora, señalamos tendencias y perspectivas que podrán contribuir para la reorganización del proceso de trabajo de enfermería en el área hospitalaria.The "Santa Casa" Hospital of Belo Horizonte has implemented a new management system that has characterized it as a flexible organization. Based on this context, the authors of this research defined the following objectives: to analyze nursing administration by considering the implementation of the Management System (SIGESC, to describe how the nursing team

  1. Nucleogenic production of Ne isotopes in Earth's crust and upper mantle induced by alpha particles from the decay of U and Th

    Science.gov (United States)

    Leya, Ingo; Wieler, Rainer

    1999-07-01

    The production of nucleogenic Ne in terrestrial crust and upper mantle by alpha particles from the decay of U and Th was calculated. The calculations are based on stopping powers for the chemical compounds and thin-target cross sections. This approach is more rigorous than earlier studies using thick-target yields for pure elements, since our results are independent of limiting assumptions about stopping-power ratios. Alpha induced reactions account for >99% of the Ne production in the crust and for most of the 20,21Ne in the upper mantle. On the other hand, our 22Ne value for the upper mantle is a lower limit because the reaction 25Mg(n,α)22Ne is significant in mantle material. Production rates calculated here for hypothetical crustal and upper mantle material with average major element composition and homogeneously distributed F, U, and Th are up to 100 times higher than data presented by Kyser and Rison [1982] but agree within error limits with the results by Yatsevich and Honda [1997]. Production of nucleogenic Ne in "mean" crust and mantle is also given as a function of the weight fractions of O and F. The alpha dose is calculated by radiogenic 4He as well as by the more retentive fissiogenic 136Xe. U and Th is concentrated in certain accessory minerals. Since the ranges of alpha particles from the three decay chains are comparable to mineral dimensions, most nucleogenic Ne is produced in U- and Th-rich minerals. Therefore nucleogenic Ne production in such accessories was also calculated. The calculated correlation between nucleogenic 21Ne and radiogenic 4He agrees well with experimental data for Earth's crust and accessories. Also, the calculated 22Ne/4He ratios as function of the F concentration and the dependence of 21Ne/22Ne from O/F for zircon and apatite agree with measurements.

  2. Índice de qualidade do solo associado à recarga de água subterrânea (IQS RA na Bacia Hidrográfica do Alto Rio Grande, MG

    Directory of Open Access Journals (Sweden)

    Camila Cristina Alvarenga

    2012-11-01

    Full Text Available A proposição de índices de qualidade do solo tem crescido de forma considerável nos últimos anos para análises de sustentabilidade ambiental e da produção agrícola. No entanto, não há, nas condições brasileiras, o desenvolvimento de qualquer indicador de qualidade do solo vinculado à recarga de água subterrânea. O objetivo deste estudo foi gerar um índice de qualidade do solo, relacionado à recarga de água subterrânea (IQS RA, válido para as condições da Bacia Hidrográfica do Alto Rio Grande e proceder a seu mapeamento por meio de técnicas geoestatísticas. O IQS RA proposto é uma combinação linear de três indicadores relacionados à infiltração de água no solo: densidade do solo, condutividade hidráulica saturada e macroporosidade. Para sua validação, foi considerada a participação do deflúvio base (ou subterrâneo no deflúvio total para quatro sub-bacias da Bacia Hidrográfica do Alto Rio Grande, analisando o comportamento desses indicadores hidrológicos tendo-se como referência a distribuição espacial do IQS RA. O índice gerado mostrou-se uma ferramenta importante para avaliação do potencial do solo para recarga de água subterrânea, uma vez que ele reflete a influência dos usos da terra no comportamento do deflúvio base e, consequentemente, na dinâmica da produção de água pelas sub-bacias.

  3. Ab initio study of structure and stability of thiocarbonates, thiosilicates, thionitrates, thiophosphates, thioborates and thioaluminates L2AS3 and MAS3 (L=Li, Na; M=Be, Mg; A=C, Si, N+, P+, B-, Al-)

    International Nuclear Information System (INIS)

    Charkin, D.O.; Makki, M.L.; Charkin, O.P.

    1998-01-01

    Nonempiric calculations of potential energy surfaces for the family of isoelectron molecules and ions of lithium and sodium thiosalts of the MAS 3 type atr carried out within the frames of the MP2/6-31G * +ZPE(HF/6-31G * ) and MP4SDTQ/6-31(+)G + //MP2/6-31G * +ZPE(MP2/6-31G * ) approximations. Plane structures C s with disulfide bridge S-S are found to be most preferable for thionitrates, angular structure C s with one bridge and two end sulfur atoms - for thioborate negative ions BeBS 3 , MgBS 3 and molecules B 2 S 3 , Al 2 S 3 and structures C 2v with bidentate coordination of cations and thioanion AS 3 n- - for remaining systems. Equilibrium geometric parameters and relative energies of isomers, energies of their decomposition, frequencies and IR-intensities of normal oscillations are determined, effect of electron correlation on the calculation results is analyzed. Ortho-meta-isomery in thioborates and thioaluminates, deformation and polarization of thioanions under the effect of alkali and alkaline-earth cations and trends in chomping molecular properties in various series of the L 2 AS 3 and MAS 3 salts are discussed

  4. Incidência de ocratoxina A em café torrado e moído e em café solúvel consumido na cidade de Belo Horizonte, MG

    Directory of Open Access Journals (Sweden)

    PRADO Guilherme

    2000-01-01

    Full Text Available A ocorrência de ocratoxina A foi verificada em amostras de café solúvel e café torrado e moído, comercializados em Belo Horizonte/MG, no período de outubro/1998 a maio/1999. O método usado para a determinação de ocratoxina A foi a cromatografia líquida de alta eficiência (CLAE em combinação com cromatografia de imunoafinidade. Os valores de recuperação e coeficiente de variação de ocratoxina A foram superiores a 73% e inferiores 15%, respectivamente. As amostras de café solúvel e café torrado e moído, continham níveis de ocratoxina A entre 0,31 e 1,78ng/g e 0,99 e 5,87ng/g, respectivamente. Os resultados revelaram que o café não apresenta níveis de contaminação significativos.

  5. APORTE E DECOMPOSIÇÃO DE SERAPILHEIRA EM ÁREAS DE CERRADÃO E MATA MESOFÍTICA NA ESTAÇÃO ECOLÓGICA DE PIRAPITINGA - MG

    Directory of Open Access Journals (Sweden)

    Rômulo Guimarães Giácomo

    2012-01-01

    Full Text Available This study aimed to quantify the litter and nutrients amount and to estimate the decomposition rate in areas of mesophytic forest and 'Cerradão' in the Ecological Station of Pirapitinga. To evaluate litter and nutrients devolution 10 conic litter traps were randomly distributed in an area 0.1 ha in each area of study, with monthly evaluations. The litter decomposition in the areas of study was evaluated by using litter bags. The total production of litter was 2.50 and 2.92 Mg ha-1 yr-1 for mesophytic forest and 'Cerradão' areas, respectively. The nutrients devolution importance order was nitrogen> potassium> phosphorus. The mesophytic forest showed more homogeneous distribution of litter fall over the year and higher values of total annual litter and nutrients, the highest values were observed at the dry season. The half-life decomposition of leaf litter was equivalent between areas, about 161 days in the mesophytic forest area and 173 in 'Cerradão' area.

  6. Quasi-free knockout reactions with the proton-dripline nucleus {sup 17}Ne

    Energy Technology Data Exchange (ETDEWEB)

    Wamers, Felix; Aumann, Thomas [Institut fuer Kernphysik, TU, Darmstadt (Germany); Heil, Michael [Kernreaktionen und Nukleare Astrophysik, GSI, Darmstadt (Germany); Marganiec, Justyna [ExtreMe Matter Institute EMMI, GSI, Darmstadt (Germany); Plag, Ralf [Kernreaktionen und Nukleare Astrophysik, GSI, Darmstadt (Germany); Goethe Universitaet, Frankfurt a.M. (Germany); Collaboration: R3B-Collaboration

    2011-07-01

    {sup 17}Ne is a proton-dripline nucleus that has raised special interest in nuclear-structure physics in recent years. As a ({sup 15}O+2p) Borromean 3-body system, it is often considered to be a 2-proton-halo nucleus, yet lacking concluding experimental evidence about its structure. We have studied breakup reactions of 500 AMeV {sup 17}Ne secondary beams using the R{sup 3}B-LAND setup at GSI. One focus was on the quasi-free one-proton knockout in a proton-rich paraffin (CH{sub 2}) target in inverse kinematics, i.e., {sup 17}Ne(p,2p){sup 16}F{yields}{sup 15}O+p, in comparison to the one-proton knockout with a carbon target. Recoil protons have been detected with Si-Strip detectors and the surrounding 4{pi} NaI spectrometer ''Crystal Ball'', thus providing a clean signature for quasi-free knockout. First results on two-proton removal cross sections with CH{sub 2} and C targets will be presented, as well as transverse momentum distributions of the {sup 15}O core in {sup 17}Ne. Projectile-like forward protons after one-proton knockout from {sup 17}Ne have been measured in coincidence with the {sup 15}O residual core, leading to the relative-energy spectrum of the unbound {sup 16}F. Possible interpretations and implications regarding the structure of {sup 17}Ne are discussed.

  7. Neutron spectrometer using NE218 liquid scintillator

    International Nuclear Information System (INIS)

    Dance, J.B.; Francois, P.E.

    1976-01-01

    A neutron spectrometer has been constructed using NE218 liquid scintillator. Discrimination against electron-gamma events was obtained usng a charge-comparison pulse shape discrimination system. The resolution obtained was about 0.25 MeV F.W.H.M. at 2.0 MeV

  8. Ne beam-Kr target interaction

    Energy Technology Data Exchange (ETDEWEB)

    Fortov, V E; Kostin, V V; Vorob` ev, V S [Russian Academy of Sciences, Moscow (Russian Federation). High Energy Density Research Center; Kulish, M I; Mintsev, V B [Russian Academy of Sciences, Chernogolovka (Russian Federation). Inst. of Chemical Physics; Hoffman, [Gesellschaft fuer Schwerionenforschung, Darmstadt (Germany)

    1997-12-31

    Energetic heavy ions of Ne - crystal Kr target interaction is investigated both experimentally and with the help of a 2-D computer code. The dynamics of the target matter heating, expansion, and destruction are described. A new equation of state for Kr was obtained and tested within a wide range of parameters. (author). 2 figs., 10 refs.

  9. The DAΦNE cryogenic system

    International Nuclear Information System (INIS)

    Modena, M.

    1997-12-01

    The DAΦNE Project utilises superconductivity technology for a total of six superconducting magnets: the two Experiment magnets (KLOE and FINUDA) and the four Compensator Solenoid magnets needed to compensate the magnetic effect of the Experiment magnets on the electron and positron beams. This effect, on beams of 510 MeV (nominal DAΦNE Energy), is expected to be relevant, especially with the aim of achieving a very high luminosity, which is the main target of the Project. The KLOE superconducting magnet has two possible working positions: the first in the DAΦNE Hall, when the Experiment will be in operation, and the second one in the KLOE Assembly Hall. This second position is the first to be utilised for the KLOE magnet Acceptance Test and magnetic field mapping, prior to the mounting of all the experimental apparatus inside the magnet. This note intends to present the DAΦNE Cryogenic System and how the authors have converged to the definition of a common Cryogenic System compatible with all the six superconducting magnets

  10. Aplicabilidade da ICPC 14 e seus Efeitos nos Índices Financeiros: Um Estudo de Caso na Cooperativa de Crédito da Região de Tiros e Matutina/MG – SICOOB Creditiros

    Directory of Open Access Journals (Sweden)

    Aplicabilidade da ICPC 14 e seus Efeitos nos Índices Financeiros: Um Estudo de Caso na Cooperativa de Crédito da Região de Tiros e Matutina/MG – SICOOB Creditiros

    2015-06-01

    Full Text Available O Conselho Federal de Contabilidade (CFC bem como o Comitê de Pronunciamentos Contábeis (CPC, em sua Instrução de Pronunciamentos Contábeis – ICPC 14, indicam que as cotas partes dos cooperados em cooperativas e similares devem ser transferidas no todo ou em partes do Patrimônio Líquido para o Passivo Não Circulante. Essa instrução altera a estrutura patrimonial das cooperativas podendo causar um impacto nos seus indicadores financeiros. Diante disso, o presente artigo tem por objetivo analisar o efeito da Norma ICPC 14 na estrutura patrimonial e nos principais índices financeiros da Cooperativa de Crédito da região de Tiros e Matutina SICOOB-CREDITIROS. Foram utilizados como arcabouços teóricos: Sociedades Cooperativas; Normas Internacionais de Contabilidade e Norma ICPC 14 e Análises Financeiras. O trabalho foi elaborado a partir de dados extraídos dos balanços patrimoniais semestrais da SICOOB-CREDITIROS dentre os períodos de 2010 a 2013, foram observados os principais índices financeiros antes e depois da aplicação da Norma ICPC 14 representados graficamente, estatisticamente realizou-se o Teste t de Médias Emparelhadas para dados com distribuição normal e para dados com distribuição anormal foi aplicado o Teste de Man-Whitney. Pôde se concluir que os indicadores de Liquidez Geral, Endividamento Geral e Participação no Capital de Terceiros se apresentaram desfavoráveis, o índice Liquidez Corrente permaneceu inalterado e os índices de Composição do Endividamento e Retorno sobre o Patrimônio Líquido sofreram variações favoráveis em relação ao ICPC 14. Sendo que o efeito nos indicadores que sofreram alterações resultantes da Norma ICPC14, foi significativo.

  11. Resultados econômicos da atividade leiteira na região de Lavras (MG nos anos 2004 e 2005: um estudo multicasos Economical results of milk production systems in Lavras region (MG throughout the years 2004 and 2005: a multicase study

    Directory of Open Access Journals (Sweden)

    M.A. Lopes

    2008-04-01

    Full Text Available Estudou-se a rentabilidade da atividade leiteira de 17 propriedades da região de Lavras/MG e identificaram-se os componentes que exerceram maior influência sobre os custos finais da atividade. Os dados foram coletados mensalmente durante o período de janeiro de 2004 a dezembro de 2005. Considerou-se a margem bruta, a margem líquida e o resultado (lucro ou prejuízo como indicadores de eficiência econômica. Os itens componentes do custo operacional efetivo que exerceram maior influência sobre os custos da atividade leiteira foram, em ordem decrescente, alimentação (55,9%, mão-de-obra (19,1%, despesas diversas (11,3%, energia (7,1%, sanidade (4,9%, ordenha (0,74%, impostos (0,74% e inseminação artificial (0,23%. A margem líquida e o resultado positivo indicam que os pecuaristas têm condições de produzir a médio e a longo prazo, com conseqüente capitalização. Os resultados do estudo não podem ser extrapolados por não se tratar de uma amostra probabilística.It was studied the profitability of the milk production in 17 properties in the region of Lavras (MG, and the components that had the greatest influence on the final costs of the business were identified. The data were monthly collected from January 2004 to December 2005. The gross margin, net margin, and the result (profit or loss were taken into consideration as indicators of economic efficiency. The component items of the effective operational cost that had the greatest influence upon the costs of dairy business were, in decreasing order, feeding (55.9%, labor (19.1%, different expenses (11.3%, energy (7.1%, health (4.9%, milking (0.74%, taxes (0.74%, and artificial insemination (0,23%. The net margin and the positive result show the farmers have conditions to produce in middle and long terms, with consequent capitalization. Although, the results of the study can not be extrapolated, since they do not represent a random sampling.

  12. Nivation forms and processes in unconsolidated sediments, NE Greenland

    DEFF Research Database (Denmark)

    Christiansen, Hanne Hvidtfeldt

    1998-01-01

    Nivation, Nivation Hollow, Nival Backwall Faliure, Active layer Interflow, Pronival alluvial fans, NE Greenland......Nivation, Nivation Hollow, Nival Backwall Faliure, Active layer Interflow, Pronival alluvial fans, NE Greenland...

  13. Metodologija analize stroškov in koristi za investicije v prometno infrastrukturo na osnovi Poročila vplivov na okolje

    OpenAIRE

    Podvornik, Nina

    2016-01-01

    Povečane potrebe po prometnem omrežju vodijo k dodatnim prometnim investicijam, ki so ne glede na njihov obseg, postavitev v prostor ter učinkovitost pomemben dejavnik gospodarskega razvoja. Investicije v prometno infrastrukturo lahko na sam razvoj vplivajo pozitivno (dvig gospodarske rasti, kakovost življenja, dostopnost idr.) in tudi negativno (različni vplivi na okolje). Ker so prometne investicije zelo obsežne, je vsestranska ocena le-teh ključnega pomena pri samem prometnem načrtovanju v...

  14. Consumo hídrico e coeficiente de cultura da mamoneira na microrregião de Lavras, Minas Gerais Water consumption and crop coefficient of castor bean in the microregion of Lavras, MG, Brazil

    Directory of Open Access Journals (Sweden)

    Gervásio F. A. Rios

    2011-12-01

    Full Text Available Realizou-se este trabalho visando avaliar a evapotranspiração da cultura (ETc e o coeficiente de cultivo (Kc da cultura da mamoneira irrigada por gotejamento, sob as condições climáticas de Lavras, Minas Gerais, Brasil, no período de 24/01 a 30/08/2008. A ETc foi determinada por meio do balanço de energia, de acordo com o método da razão de Bowen, e o Kc pelos métodos e recomendações do boletim FAO 56, no período de 14/02 a 03/06/2008, correspondendo às fases I (crescimento, II (vegetativa e III (frutificaç��o e para a fase IV (maturação o Kc foi estimado por estar além do período de 03/06/2008; para isto, um experimento foi instalado no centro da área cultivada com sensores de temperatura e umidade relativa do ar, em dois níveis no dossel da cultura; de saldo de radiação (Rn sobre o dossel da cultura e sensor de fluxo de calor no solo (G a 0,08 m da superfície do solo. Os valores médios da ETc nas fases I, II e III, foram de 2,48, 2,68 e 3,04 mm d-1, respectivamente. O Kc assumiu, nessas respectivas fases, valores de 0,27, 0,46 e 0,87 e 0,57 na fase de maturação, situando-se dentro dos limites e recomendações do boletim FAO-56.The study was carried out in order to evaluate the evapotranspiration (ETc and crop coefficient (Kc of castor bean by drip irrigation system, under the climatic conditions of Lavras, Minas Gerais State, Brazil, from 01/24 to 08/30/2008. The ETc was determined by the energy balance according to the Bowen ratio method and Kc by the methods and recommendations of the FAO-56 paper, from 02/14 to 06/03/2008, corresponding to phases I (growth, II (vegetative, III (fruiting and IV (maturity. For this purpose, in the center of the experimental area, the sensors were installed to measure the temperature and relative humidity, at two levels above the crop canopy; the net radiation (Rn and the soil heat flux (G at 0.08 m under the soil surface. The average ETc values in phases I, II and III were 2

  15. Geothermal-brine modeling - prediction of mineral solubilities in natural waters: the Na-K-Mg-Ca-H-Cl-SO{sub 4}-OH-HCO{sub 3} CO{sub 3}-CO{sub 2}-H{sub 2}O system to high ionic strengths at 25{sup 0}C

    Energy Technology Data Exchange (ETDEWEB)

    Weare, J.H.

    1981-01-01

    The mineral solubility model of Harvie and Weare (1980) is extended to the eight component system, Na-K-Ca-Mg-H-Cl-SO{sub 4}-OH-HCO{sub 3}-CO{sub 3}-CO{sub 2}-H{sub 2}O at 25{sup 0}C to high concentrations. The model is based on the semi-empirical equations of Pitzer (1973) and co-workers for the thermodynamics of aqueous electrolyte solutions. The model is parameterized using many of the available isopiestic, electromotive force, and solubility data available for many of the subsystems. The predictive abilities of the model are demonstrated by comparison to experimental data in systems more complex than those used in parameterization. The essential features of a chemical model for aqueous electrolyte solutions and the relationship between pH and the equilibrium properties of a solution are discussed.

  16. Lääne-Virumaa TOP 100 aastal 2000

    Index Scriptorium Estoniae

    2001-01-01

    Lääne-Virumaa edukamad ettevõtted; Lääne-Virumaa käibe TOP 100; Käibe kasvu TOP 20; Käibe languse TOP 10; Kasumi TOP 20; Kasumi kasvu TOP 20; Rentabluse TOP 20; ROA TOP 20; Kasumi languse TOP 10; Kahjumi TOP 10; Lääne-Virumaa käibelt suuremate ettevõtete finantsandmed. Lääne-Virumaa ettevõtete üldandmed

  17. Current Status of the MiniBooNE Experiment

    OpenAIRE

    Ray, H.; collaboration, for the MiniBooNE

    2004-01-01

    MiniBooNE is an experiment designed to refute or confirm the LSND anti-nu_mu -> anti-nu_e oscillation result. MiniBooNE will look for oscillations of nu_mu -> nu_e in a closed-box appearance analysis. MiniBooNE began collecting data in 2002, and is expected to continue data taking through 2005. Current MiniBooNE results are presented.

  18. Yrast and high spin states in 22Ne

    International Nuclear Information System (INIS)

    Szanto, E.M.; Toledo, A.S. de

    1982-08-01

    High spin states in 22 Ne have been investigated by the reactions 11 B( 13 C,d) 22 Ne and 13 C( 11 B,d) 22 Ne up to E* approximately=19 MeV. Yrast states were observed at 11.02 MeV (8 + ) and 15.46 MeV (10 + ) excitation energy. A backbending in 22 Ne is observed around spin 8 + . The location of high spin states I [pt

  19. Nuclear breakup of 17Ne and its two-proton halo structure

    Energy Technology Data Exchange (ETDEWEB)

    Wamers, Felix; Aumann, Thomas [Institut fuer Kernphysik, TU Darmstadt (Germany); Bertulani, Carlos [Texas A and M University-Commerce, Commerce (United States); Chulkov, Leonid; Heil, Michael; Simon, Haik [Kernreaktionen und Nukleare Astrophysik, GSI, Darmstadt (Germany); Marganiec, Justyna [Extreme Matter Institute, GSI, Darmstadt (Germany); JINA, Notre Dame (United States); Plag, Ralf [Kernreaktionen und Nukleare Astrophysik, GSI, Darmstadt (Germany); Goethe Universitaet, Frankfurt am Main (Germany); Collaboration: R3B-Collaboration

    2012-07-01

    {sup 17}Ne is a proton-dripline nucleus that has raised interest in nuclear-structure physics in recent years. As a ({sup 15}O+2p) Borromean 3-body system, it is often considered to be a 2-proton-halo nucleus, yet lacking concluding experimental quantification of structure. We have studied breakup reactions of 500 AMeV {sup 17}Ne secondary beams in inverse kinematics using the R3B-LAND setup at GSI. The foci were on (p,2p) quasi-free scattering on a CH{sub 2} target, and on one-proton-knockout reactions on a carbon target. Recoil protons have been detected with Si-Strip detectors and a surrounding 4{pi} NaI spectrometer. Furthermore, projectile-like forward protons after one-proton knockout from {sup 17}Ne have been measured in coincidence with the {sup 15}O residual core. The resulting relative-energy spectrum of the unbound {sup 16}F, as well as proton-removal cross sections with CH{sub 2} and C targets, and the transverse-momentum distributions of the residual fragments are presented. Conclusions on the ground-state structure of {sup 17}Ne are discussed.

  20. Petrogenesis of Early Cretaceous granitoids from southwest Zhejiang, NE South China Block and its geodynamic implication

    Science.gov (United States)

    Pan, Fa-Bin; Liu, Rong; Jin, Chong; Jia, Bao-Jian; He, Xiaobo; Gao, Zhong; Tao, Lu; Zhou, Xiao-Chun; Zhang, Li-Qi

    2018-05-01

    In situ zircon U-Pb ages, whole-rock major and trace elements, and Sr-Nd isotopic compositions of the Sucun, Yunfeng, and Jingning intrusions from southwest Zhejiang, NE South China Block, are presented to trace their petrogenesis and shed light on its lithosphere evolution. LA-ICP-MS U-Pb zircon dating shows that the Sucun quartz monzonite and Jingning monzogranite were emplaced at 135 Ma, and the Yunfeng quartz monzonite and Jingning granite were emplaced at 104 and 112 Ma, respectively. All these intrusions are metaluminous to weakly peraluminous and lie within high-K calc-alkaline to shoshonite series field (SiO2 = 66-76 wt%, A/CNK = 0.95-1.09, K2O/Na2O = 0.78-1.77). The Yunfeng quartz monzonite clearly have lower K2O and total REE contents, and higher CaO, Na2O, Al2O3, P2O5, MgO, and TiO2 contents, and relatively less enriched Sr-Nd isotopic compositions than those of the Sucun quartz monzonite, indicating that the Yunfeng quartz monzonite were derived from partial melting of a more juvenile lower crust sources compared with the magma source of the Sucun quartz monzonite. The Jingning monzogranite exhibit similar major elements covariations and Nd isotopic compositions, but higher Ba, Sr, and Eu contents and lower Rb, Th, and U contents than those of the Jingning granite. The geochemical features imply that the Jingning monzogranite and granite were fluid-present and fluid-absent anatexis products of the same Paleoproterozoic crustal source, respectively. Whole-rock Sr-Nd isotopic data imply that the estimated amounts of juvenile mantle-derived melts input into the mature crust show southeastward decreasing trend away from the Jiangshan-Shaoxing fault. We propose that roll-back and retreat of the Paleo-Pacific subducting plate might cause extensive asthenosphere mantle upwelling in East China, and the mantle-derived melts tend to rise through the regional main fault zones and preferentially modify the lithosphere nearby these faults.

  1. β decay of Na32

    Science.gov (United States)

    Mattoon, C. M.; Sarazin, F.; Hackman, G.; Cunningham, E. S.; Austin, R. A. E.; Ball, G. C.; Chakrawarthy, R. S.; Finlay, P.; Garrett, P. E.; Grinyer, G. F.; Hyland, B.; Koopmans, K. A.; Leslie, J. R.; Phillips, A. A.; Schumaker, M. A.; Scraggs, H. C.; Schwarzenberg, J.; Smith, M. B.; Svensson, C. E.; Waddington, J. C.; Walker, P. M.; Washbrook, B.; Zganjar, E.

    2007-01-01

    The β-decay of Na32 has been studied using β-γ coincidences. New transitions and levels are tentatively placed in the level scheme of Mg32 from an analysis of γ-γ and β-γ-γ coincidences. The observation of the indirect feeding of the 2321 keV state in Mg32 removes some restrictions previously placed on the spin assignment for this state. No evidence of a state at 2117 keV in Mg32 is found. Previously unobserved weak transitions up to 5.4 MeV were recorded but could not be placed in the decay scheme of Na32.

  2. Implicações do novo modelo de administração pública na gestão das pessoas na prefeitura municipal de Uberlândia, MG http://dx.doi.org/10.15601/1983-7631/rt.v8n15p163-183

    Directory of Open Access Journals (Sweden)

    Walter Miquelanti Júnior

    2015-12-01

    Full Text Available O objetivo deste trabalho foi identificar e analisar implicações na gestão de pessoas na Prefeitura Municipal de Uberlândia (PMU, no que refere a Integração e Acolhimento, Treinamento e Desenvolvimento, Avaliação de Desempenho, Motivação e Gestão de Carreira. A coleta dos dados foi por meio de questionário respondido por 102 funcionários de sete secretarias. Para as análises foi utilizado a Escala de Likert. Os resultados indicaram que há a utilização de técnicas de gestão de pessoas no âmbito da administração pública para aumentar a produtividade de seus servidores. Contudo, existem problemas na gestão de pessoas, principalmente, no tocante ao Treinamento e Desenvolvimento. Palavras-chave: prefeitura de Uberlândia; gestão de pessoas; administração pública.  

  3. Estoque domiciliar de medicamentos na comunidade ibiaense acompanhada pelo Programa Saúde da Família, em Ibiá-MG, Brasil Drug storage at home in the community assisted by the Family Health Programme in Ibiá, MG, Brazil

    Directory of Open Access Journals (Sweden)

    Maria Ângela Ribeiro

    2010-09-01

    Full Text Available O objetivo do estudo foi examinar o estoque de medicamentos na comunidade Ibiaense acompanhada pelo Programa Saúde da Família (PSF. Buscou-se descrever as características dos usuários, as condições de armazenamento, as classes terapêuticas, as formas farmacêuticas e a procedência dos medicamentos do estoque caseiro. Foram visitados 285 domicílios, no período de julho a setembro de 2004. Verificou-se que a média de medicamentos por domicílio foi de 8,4, e que 93,5% das famílias entrevistadas apresentaram pelo menos um medicamento em estoque. Os medicamentos estocados em maior número foram: analgésicos (11,15%, seguidos dos diuréticos (6,42%, antibacterianos para uso sistêmico (5,82%, anti-inflamatórios (5,08% e antiácidos (4,10%. Embora seja considerável o número de medicamentos estocados nos domicílios, foi pequeno o número de medicamentos sem prescrição médica procedentes do Sistema Público de Saúde, sendo este um reflexo favorável dos serviços de Assistência Farmacêutica do Município. Apesar disso, foi verificado um elevado percentual (41,6% de medicamentos adquiridos em farmácias sem a devida prescrição médica (automedicação. Foi encontrado um percentual de 18,5% de medicamentos vencidos. Verificou-se, também, que parte do estoque domiciliar resulta de prescrições com quantidades superiores às necessárias para o tratamento (20%, do não cumprimento do tratamento prescrito (17% e da aquisição por conta própria (9%. O estudo sugere a necessidade de orientação dos usuários em relação à utilização e ao armazenamento dos medicamentos, à sistematização dos registros de dados e oferece subsídios para adoção de decisões vinculadas ao processo de planejamento e execução das ações na Assistência Farmacêutica.The objective of this study was to examine the stock of drugs in the community that is assisted by Programa Saúde da Família (PSF - Family Health Programme in the city of Ibi

  4. Kaj napravi manj izobražene odrasle drugačne?

    Directory of Open Access Journals (Sweden)

    Dušana Findeisen

    1997-12-01

    Full Text Available Avtorica v tem prispevku obravnava vprašanje: kako se učijo manj izobraženi odrasli. V zvezi s tem se ustavi tudi pri motivaciji za izobraževanje pri takšnih odraslih učencih in ugotavlja, da imajo le življenjske potrebe, ne pa tudi izobraževalnih. Pri tem uporabljajo tudi posebne načine učenja. Vse to narekuje mentorju drugačno programiranje in izpeljavo izobraževalnega programa. Vprašanje, ki se mu Dušana Findeisen najbolj posveti, je vprašanje mentorjevega diskurza, ki mora biti čim bolj podobno diskurzu, ki ponazarja delo. Mentorjeva govorica ne sme biti formalizirana in do kraja strukturirana. Mentor naj jo takoj oblikuje. Uporablja naj dosti parafraz. Njegova misel “Se mora iskati”. Svoja spoznanja avtorica opira na izkušnje pridobljene v jezikovnih tečajih, po programih, ki temeljijo na analiziranih govornih in drugih potrebah skupine, to je programih, namenjenih skupinam natakarjev in sprevodnikov na vlakih intercity.

  5. He-Ne laser treatment improves the photosynthetic efficiency of wheat exposed to enhanced UV-B radiation

    International Nuclear Information System (INIS)

    Chen, Huize; Han, Rong

    2014-01-01

    The level of ultraviolet-B (UV-B) radiation on the Earth’s surface has increased due to depletion of the ozone layer. Here, we explored the effects of continuous wave He-Ne laser irradiation (632 nm, 5 mW mm –2 , 2 min d –1 ) on the physiological indexes of wheat seedlings exposed to enhanced UV-B radiation (10 KJ m –2 d –1 ) at the early growth stages. Wheat seedlings were irradiated with enhanced UV-B, He-Ne laser treatment or a combination of the two. Enhanced UV-B radiation had deleterious effects on wheat photosynthesis parameters including photosystem II (chlorophyll content, Hill reaction, chlorophyll fluorescence parameters, electron transport rate (ETR), and yield), the thylakoid (optical absorption ability, cyclic photophosphorylation, Mg 2+ -ATPase, and Ca 2+ -ATPase) and some enzymes in the dark reaction (phosphoenolpyruvate carboxylase (PEPC), carbonic anhydrase (CA), malic dehydrogenase (MDH), and chlorophyllase). These parameters were improved in UV-B-exposed wheat treated with He-Ne laser irradiation; the parameters were near control levels and the enzyme activities increased, suggesting that He-Ne laser treatment partially alleviates the injury caused by enhanced UV-B irradiation. Furthermore, the use of He-Ne laser alone had a favourable effect on seedling photosynthesis compared with the control. Therefore, He-Ne laser irradiation can enhance the adaptation capacity of crops. (paper)

  6. Structural characteristics and corrosion behavior of biodegradable Mg-Zn, Mg-Zn-Gd alloys.

    Science.gov (United States)

    Kubásek, J; Vojtěch, D

    2013-07-01

    In this research, binary Mg-Zn (up to 3 wt% Zn) and ternary Mg-Zn-Gd (up to 3 wt% Gd, 3 wt% Zn) alloys were prepared by induction melting in an argon atmosphere. The structures of these alloys were characterized using light and scanning electron microscopy, energy dispersive spectrometry, X-ray diffraction and X-ray fluorescence. In addition, Brinell hardness measurements were taken to supplement these studies. Corrosion behavior was evaluated by immersion tests and potentiodynamic measurements in a physiological solution (9 g/l NaCl). Depending on the composition, structures of the as-cast alloys contained α-Mg dendrites, MgZn, Mg5Gd and Mg3Gd2Zn3 phases. Compared to pure Mg, zinc improved the corrosion resistance of binary Mg-Zn. Gadolinium also improved the corrosion resistance in the case of Mg-1Zn-3Gd alloy. The highest corrosion rate was observed for Mg-3Zn-3Gd alloy. Our results improve the understanding of the relationships between the structure and corrosion behavior of our studied alloy systems.

  7. Collision-induced intramultiplet mixing for the Ne**[(2p)5(3p)] + He or Ne system

    International Nuclear Information System (INIS)

    Manders, M.P.I.

    1988-01-01

    For the Ne**-He case, experimental data are confronted with quantum mechanical calculations. Quantum mechanical coupled-channel calculations using model potentials as input are presented, followed by a semiclassical approach which provides more physical insight. Experimental results are presented for the Ne**-Ne system with a discussion of the general principles involved in symmetrization. 184 refs.; 93 figs.; 19 tabs

  8. UCB-NE-101 user's manual

    International Nuclear Information System (INIS)

    Lee, W.W.L.

    1989-02-01

    The purpose of this manual is to provide users of UCB-NE-101 with the information necessary to use UCB-NE-101 effectively. UCB-NE-101 calculates the concentration of solubility-limited species as a function of space and time and its mass flux rates from a waste sphere buried in a nuclear waste repository in water-saturated rock. The waste is surrounded by one type of rock, and some distance away, there is another type of rock. The inner layer of rock can be a backfill around a nuclear waste package and the outer layer the natural rock. The mass flux calculated is at the interface of the two layers. The species concentration calculated is in the inner layer. A constant concentration of the species, usually the solubility, is specified at the waste sphere/inner layer interface. Dissolution and transport is governed by the solubility of the species, and diffusion in the porous media. 1 ref., 1 fig

  9. Discharge behaviour of Mg-Al-Pb and Mg-Al-Pb-In alloys as anodes for Mg-air battery

    International Nuclear Information System (INIS)

    Wang, Naiguang; Wang, Richu; Peng, Chaoqun; Peng, Bing; Feng, Yan; Hu, Chengwang

    2014-01-01

    Highlights: • We investigate the effect of indium on the discharge behaviour of Mg-Al-Pb alloy. • We evaluate the performance of Mg-air batteries with Mg-Al-Pb and Mg-Al-Pb-In anodes. • We analyze the activation mechanism of Mg-Al-Pb-In alloy in the discharge process. - Abstract: The discharge behaviour of Mg-Al-Pb and Mg-Al-Pb-In alloys in 3.5 wt.% NaCl solution is investigated by electrochemical techniques, and compared with that of pure magnesium. The results show that Mg-Al-Pb-In alloy provides a more negative potential and exhibits a higher utilization efficiency in contrast with Mg-Al-Pb alloy and pure magnesium during the half-cell test at a large current density, and gives desirable discharge performance when used as anode for Mg- air battery. The peak power density of the Mg-air battery with Mg-Al-Pb-In anode is 94.5 mW cm −2 , which is comparable with those of Mg-H 2 O 2 semi-fuel batteries. Moreover, the activation mechanism of Mg-Al-Pb-In alloy during the discharge process is also analyzed

  10. Prevalência do complexo teníase-cisticercose na zona rural do município de Viçosa, Minas Gerais Prevalence of Taeniasis-cysticercosis complex in the rural area of Viçosa-MG, Brazil

    Directory of Open Access Journals (Sweden)

    Adriana Felix Iasbik

    2010-07-01

    Full Text Available A teníase é uma doença que se manifesta no ser humano em decorrência da presença da forma adulta da Taenia sp., enquanto a cisticercose decorre da infecção pelo estágio larvar da Taenia sp. ou Taenia solium, no caso dos suínos e humanos. Foi realizado um estudo transversal visando a determinar a prevalência de cisticercose em suínos e de teníase em 176 propriedades localizadas na zona rural de Viçosa, Minas Gerais (MG. Foram coletadas amostras de sangue de 226 suínos e fezes de 266 humanos, além da realização de um inquérito epidemiológico. Não foi identificada teníase humana, e a prevalência da cisticercose suína foi de 0,4%. As informações obtidas mostraram que a maioria das pessoas possuía o hábito de consumir carne suína não inspecionada; entretanto, todas as pessoas se alimentavam da carne bem aquecida. Em apenas 1,1% das propriedades, o esgoto era depositado diretamente no solo e em 99,4% destas a água era canalizada, enquanto 88,1% dos suínos eram criados presos. Concluiu-se que, na zona rural do município de Viçosa-MG, a prevalência do complexo teníase-cisticercose foi baixa, mostrando ainda um nível de contaminação inferior ao de outros municípios onde o complexo foi estudado.Taeniasis occurs due to the presence of the adult form of Taenia sp. in human beings, and cysticercosis is caused by the presence of the larval stage of T. solium in pigs and humans. A transversal study was conducted aiming to determine the prevalence of porcine cysticercosis and Taeniasis in 176 farms located in rural areas of Viçosa-MG. Blood samples of 226 pigs, and feces samples of 266 humans were collected. An epidemiological survey has also been done. We found a prevalence of 0.4% of porcine cysticercosis and Taeniasis has not been found. The epidemiological data has shown that although most people consumed non-inspected pork, it used to be prepared well-done. Data showed that 88.1% of the pigs are reared in confinement

  11. Performance Analysis of Different NeQuick Ionospheric Model Parameters

    Directory of Open Access Journals (Sweden)

    WANG Ningbo

    2017-04-01

    Full Text Available Galileo adopts NeQuick model for single-frequency ionospheric delay corrections. For the standard operation of Galileo, NeQuick model is driven by the effective ionization level parameter Az instead of the solar activity level index, and the three broadcast ionospheric coefficients are determined by a second-polynomial through fitting the Az values estimated from globally distributed Galileo Sensor Stations (GSS. In this study, the processing strategies for the estimation of NeQuick ionospheric coefficients are discussed and the characteristics of the NeQuick coefficients are also analyzed. The accuracy of Global Position System (GPS broadcast Klobuchar, original NeQuick2 and fitted NeQuickC as well as Galileo broadcast NeQuickG models is evaluated over the continental and oceanic regions, respectively, in comparison with the ionospheric total electron content (TEC provided by global ionospheric maps (GIM, GPS test stations and JASON-2 altimeter. The results show that NeQuickG can mitigate ionospheric delay by 54.2%~65.8% on a global scale, and NeQuickC can correct for 71.1%~74.2% of the ionospheric delay. NeQuick2 performs at the same level with NeQuickG, which is a bit better than that of GPS broadcast Klobuchar model.

  12. Production of Mg and Al Auger electrons by noble gas ion bombardment of Mg and Al surfaces. [3 KeV, electron promotion

    Energy Technology Data Exchange (ETDEWEB)

    Ferrante, J; Pepper, S V [National Aeronautics and Space Administration, Cleveland, Ohio (USA). Lewis Research Center

    1976-08-01

    In this letter the relative production efficiency of Mg and Al Auger electrons by He, Ne, Ar, Kr and Xe ion bombardment as a function of ion energy (<=3 keV) is reported. Some comments on the interpretation of the results in terms of electron promotion are also given.

  13. Sterile Neutrino Searches in MiniBooNE and MicroBooNE

    Energy Technology Data Exchange (ETDEWEB)

    Ignarra, Christina M. [Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)

    2014-09-01

    Tension among recent short baseline neutrino experiments has pointed toward the possible need for the addition of one or more sterile (non-interacting) neutrino states into the existing neutrino oscillation framework. This thesis first presents the motivation for sterile neutrino models by describing the short-baseline anomalies that can be addressed with them. This is followed by a discussion of the phenomenology of these models. The MiniBooNE experiment and results are then described in detail, particularly the most recent antineutrino analysis. This will be followed by a discussion of global fits to world data, including the anomalous data sets. Lastly, future experiments will be addressed, especially focusing on the MicroBooNE experiment and light collection studies. In particular, understanding the degradation source of TPB, designing the TPB-coated plates for MicroBooNE and developing lightguide collection systems will be discussed. We find an excess of events in the MiniBooNE antineutrino mode results consistent with the LSND anomaly, but one that has a different energy dependence than the low-energy excess reported in neutrino mode. This disagreement creates tension within global fits which include up to three sterile neutrinos. The low-energy excess will be addressed by the MicroBooNE experiment, which is expected to start taking data in early 2015. Tension among existing experiments calls for additional, more decisive future experiments.

  14. Sterile Neutrino Searches in MiniBooNE and MicroBooNE

    Energy Technology Data Exchange (ETDEWEB)

    Ignarra, Christina M. [Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)

    2014-09-01

    Tension among recent short baseline neutrino experiments has pointed toward the possible need for the addition of one or more sterile (non-interacting) neutrino states into the existing neutrino oscillation framework. This thesis fi rst presents the motivation for sterile neutrino models by describing the short-baseline anomalies that can be addressed with them. This is followed by a discussion of the phenomenology of these models. The MiniBooNE experiment and results are then described in detail, particularly the most recent antineutrino analysis. This will be followed by a discussion of global fits to world data, including the anomalous data sets. Lastly, future experiments will be addressed, especially focusing on the MicroBooNE experiment and light collection studies. In particular, understanding the degradation source of TPB, designing the TPB-coated plates for MicroBooNE and developing lightguide collection systems will be discussed. We find an excess of events in the MiniBooNE antineutrino mode results consistent with the LSND anomaly, but one that has a di fferent energy dependence than the low-energy excess reported in neutrino mode. This disagreement creates tension within global fi ts which include up to three sterile neutrinos. The low-energy excess will be addressed by the MicroBooNE experiment, which is expected to start taking data in early 2015. Tension among existing experiments calls for additional, more decisive future experiments.

  15. Eriyik Tuz Reaktörlerinde Yakıt Malzemesi Olarak Kullanılan Na Çekirdeğinin Üretim Tesir Kesiti Hesaplamaları

    Directory of Open Access Journals (Sweden)

    S. Sedat DOĞAN

    2014-12-01

    Full Text Available Özet: Bu çalışmada, eriyik tuz reaktörlerinde yakıt malzemesi olarak kullanılan Na çekirdeğinin üretim tesir kesitleri hesaplanmıştır. Hesaplamalar; 24Mg(p,α21Na, 23Na(n,γ24Na, 24Mg(n,p24Na, 20Ne(d,n21Na ve 23Na(n,2n22Na reaksiyonları için 70 MeV parçacık gelme enerjisine kadar denge ve denge–öncesi nükleer reaksiyon modelleri kullanılarak gerçekleştirilmiştir. Denge–öncesi hesaplamalar için; Full Exciton Model, Hibrit Model, Geometri Bağımlı Hibrit Model ve Cascade Exciton Model, denge hesaplamaları için ise; Weisskopf–Ewing Model kullanılmıştır. Elde edilen sonuçlar, Deneysel Nükleer Reaksiyon Data (EXFOR Kütüphanesi'nden alınan deneysel değerlerle karşılaştırılmıştır. Ayrıca; 21,22,24Na üretimi için optimum enerji aralıkları belirlenmiştir. Anahtar kelimeler: Eriyik tuz reaktörleri, reaksiyon tesir kesiti, EXFOR, denge ve denge–öncesi reaksiyonlar, nükleer reaksiyonlar modelleri Production Cross Section Calculations of Na Nucleus Used as Fuel Material in Molten Salt Reactors Abstract: In this study, the production cross sections of Na nucleus used as fuel material in molten salt reactors have been calculated. The calculations for 24Mg(p,α21Na, 23Na(n,γ24Na, 24Mg(n,p24Na, 20Ne(d,n21Na and 23Na(n,2n22Na reactions have been carried out up to 70 MeV incident particle energies by using the equilibrium and pre–equilibrium nuclear reaction models. Full Exciton Model, Hybrid Model, Geometry Dependent Hybrid Model and Cascade Exciton Model for the pre–equilibrium reactions and Weisskopf–Ewing Model for the equilibrium reactions have been used. The calculated results have been compared with experimental data taken from the Experimental Nuclear Reaction Data (EXFOR library. Also, the optimum energy ranges for 21,22,24Na production have been determined. Key words: Molten salt reactor, reaction cross section, EXFOR, equilibrium and pre–equilibrium reactions, nuclear

  16. OBVLADOVANJE STRESA NA DELOVNEM MESTU OPERATERJA V REGIJSKEM CENTRU ZA OBVEŠČANJE

    OpenAIRE

    Piškur, Luka

    2016-01-01

    Hiter življenjski tempo sodobne družbe nas je v zadnjih letih privedel do tega, da ne najdemo kvalitetnega časa sami zase. Poslužujemo se nekvalitetne prehrane, ne najdemo časa za počitek, preplavljajo nas negativne misli in čustva. Tako doma kot na delovnem mestu se soočamo s frustracijami, roki in zahtevami, za katere se večina od nas sploh ne zaveda, kako stresni so. S prepoznavanjem simptomov stresa lahko naredimo prvi korak k temu, da izboljšamo kvaliteto našega življenja. Cilj diplo...

  17. Discovery of the shape coexisting 0{sup +} state in {sup 32}Mg

    Energy Technology Data Exchange (ETDEWEB)

    Wimmer, Kathrin

    2010-08-16

    The evolution of shell structure in exotic nuclei as a function of proton (Z) and neutron (N) number is currently at the center of many theoretical and experimental investigations. It has been realized that the interaction of the last valence protons and neutrons, in particular the monopole component of the residual interaction between those nucleons, can lead to significant shifts in the single-particle energies, leading to the collapse of classic shell closures and the appearance of new shell gaps. The ''Island of Inversion'' around {sup 32}Mg, which is one of the most studied phenomena in the nuclear chart, is a well known example for such changes in nuclear structure. In this region of neutron-rich nuclei around the magic number N=20 strongly deformed ground states in Ne, Na, and Mg isotopes have been observed. Due to the reduction of the N=20 shell gap quadrupole correlations can enable low-lying deformed 2p-2h intruder states from the fp-shell to compete with spherical normal neutron 0p-0h states of the sd-shell. In this situation the promotion of a neutron pair across the N=20 gap can result in deformed intruder ground states. Consequentially the two competing configurations can lead to the coexistence of spherical and deformed 0{sup +} states in the neutron rich nuclei {sup 30,32}Mg. In this work the shape coexistence in {sup 32}Mg was studied by a two neutron transfer reaction at the REX-ISOLDE facility (CERN). The two neutron transfer reaction with a {sup 30}Mg beam involved for the first time the use of a radioactive tritium target in combination with a radioactive heavy ion beam. Light charged particles emitted from the target were detected and identified by the T-REX particle detector while {gamma}-rays were detected by the MINIBALL Germanium detector array. The shape of the angular distribution of the protons allows to unambiguously determine the angular momentum transfer {delta}L of the reaction and thus to identify the 0{sup

  18. RAST PODJETJA S POMOČJO FRANŠIŽE NA PRIMERU PODJETJA MERCATOR D.D.

    OpenAIRE

    Podgoršek, Nuša

    2013-01-01

    Podjetja lahko rastejo na zelo različne načine, vendar v podjetju lahko nastane rast na pasiven ali aktiven način. Možno je tudi da določena podjetja sploh ne rastejo. Rast podjetja pa predstavlja tudi ključen pomen, ki prispeva tudi k razvoju gospodarstva, ustvarjanju novih delovnih mest in dvigu nivoja družbenega blagostanja. V diplomskem seminarju smo poskušali pokazati, da podjetje lahko raste s pomočjo franšiznega sistema. Franšizing predstavlja metodo, kjer na osnovi franšizne pogo...

  19. 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...

  20. DISTRIBUTION OF MAJOR ELEMENTS (Na, K, Ca, Mg) IN THE ...

    African Journals Online (AJOL)

    a

    and coffee leaves in Cote d'Ivoire and elsewhere is claimed to be useful in detecting low .... the difference in their ages because the Ifaki-Ekiti sample is in the fruiting stage (more mature) ..... photosynthesis, green plants cannot do without it.

  1. Splitter magnets for DAΦNE project

    International Nuclear Information System (INIS)

    Sanelli, C.; Hsieh, H.

    1992-01-01

    A 510 MeV electron positron colliding beam facility is under design and construction. The project consists of two storage rings, accumulator, electron/positron linac and transfer lines. The design of the splitter magnets which separate the circulating beams immediately after passing through the DAΦNE interaction point is presented. The results of 2-D and 3-D magnetic calculations is presented, and the electrical and mechanical design of the magnet are described. A 1/3 length prototype of this magnet is under construction. (R.P.) 2 refs.; 8 figs.; 2 tabs

  2. Study of the $\\beta$-delayed Particle Emission of $^{17}$Ne

    CERN Multimedia

    2002-01-01

    We intend to investigate the charged particle decay modes from the excited states of $^{17}$F populated in the $\\beta^+$- decay of $^{17}$Ne. In particular, we propose to study the proton decay branches to $^{16}$O states which are unstable to $\\alpha$- decay. We plan to use the recently developed ISOLDE Si-ball detector array in order to efficiently detect the charged particles in a wide solid angle. We ask for a total of 12 shifts, including 9 shifts for $^{17}$Ne and 3 shifts for stable beam and calibrations. We request the use of a Mg oxide target coupled to a plasma ion source with cooled transfer line or, if possible, to the new MINIMONOECRIS. We would like to make use of the ISOLDE VME DAQ and CERN data storage system.

  3. Caracterização e classificação do resíduo sólido "pó do balão", gerado na indústria siderúrgica não integrada a carvão vegetal: estudo de um caso na região de Sete Lagoas/MG

    Directory of Open Access Journals (Sweden)

    Oliveira Míriam Regina Cardoso de

    2003-01-01

    Full Text Available This research was developed by considering that the solid waste produced in the process of pig iron production represents the loss of raw materials and the increase in environmental problem. The charcoal based mini blast-furnace off gases dust named CHARCOK was collected from SIDERPA fraction three-quarters Siderúrgica Paulino Ltda, located in Sete Lagoas, Minas Gerais. The Charcok was characterized and classified according to ABNT (Associação Brasileira de Normas Técnicas standard. The results showed that the Charcok should be classified as Class I Wastes fraction three-quarters "Hazard Wastes" because of its high concentration of phenols (54.5mg C6H5OH/kg. The Charcok had high concentration of iron and charcoal which can be used as energy source.

  4. Percepção da população de Santa Maria de Itabira (MG acerca da implantação de uma mina de minério de ferro na região de Morro Escuro

    Directory of Open Access Journals (Sweden)

    Marina Ferreira de Andrade

    2018-01-01

    Full Text Available A atividade minerária representa um dos setores fundamentais para a economia mundial, atuando no suprimento de matérias-primas para os mais variados seguimentos e na manutenção da qualidade de vida da população. No entanto, a mineração desencadeia impactos sociais, econômicos e ambientais, os quais requerem o estabelecimento de políticas que possibilitem o desenvolvimento desta atividade em bases mais eficientes. Neste contexto, esta pesquisa objetivou analisar a percepção da população de Santa Maria de Itabira (MG acerca da implantação de uma mina de minério de ferro ao longo da Serra de Morro Escuro e dos impactos socioeconômicos e ambientais decorrentes de tal atividade. Para tal, foram aplicados questionários a 371 moradores desse município. Dessa forma, foi possível avaliar que apesar da população identificar os impactos socioambientais negativos desencadeados pela atividade minerária, tais como degradação, poluição, desmatamento, contaminação, risco de acidentes e problemas de saúde, uma parcela significativa considera importante a instalação de tal atividade na cidade, dada a possibilidade de geração de empregos e crescimento econômico do município. Ressalta-se a importância da realização de novas pesquisas voltadas para a compreensão dos anseios e percepções dos diferentes atores sociais envolvidos na extração mineral, de modo que esta atividade possa promover práticas sustentáveis que permitam aos cidadãos o direito de suprir suas necessidades, sem comprometer àquelas relacionadas à geração futura.

  5. Impact of the uncertainty in α-captures on {sup 22}Ne on the weak s-process in massive stars

    Energy Technology Data Exchange (ETDEWEB)

    Nishimura, N. [Astrophysics group, EPSAM, Keele University, Keele, ST5 1BH, UK and NuGrid Project (United Kingdom); Hirschi, R. [Astrophysics group, EPSAM, Keele University, Keele, ST5 1BH, UK and Kavli IPMU (WPI), University of Tokyo, Kashiwa, 277-8583 (Japan); Pignatari, M. [NuGrid Project and Department of Physics, University of Basel, Basel, CH-4056 (Switzerland); Herwig, F. [NuGrid Project and Department of Physics and Astronomy, University of Victoria, Victoria, BC V8P5C2 (Canada); Beard, M. [NuGrid Project and Department of Physics, University of Notre Dame, Notre Dame, IN 46556 (United States); Imbriani, G. [Dipartiment di Scienze Fisiche, Universita di Napoli Federico II, Napoli (Italy); Görres, J.; Boer, R. J. de; Wiescher, M. [Department of Physics, University of Notre Dame, Notre Dame, IN 46556 (United States)

    2014-05-02

    Massive stars at solar metallicity contribute to the production of heavy elements with atomic masses between A = 60 and A = 90 via the so-called weak s-process (which takes place during core He and shell C burning phases). Furthermore, recent studies have shown that rotation boosts the s-process production in massive stars at low metallicities, with a production that may reach the barium neutron-magic peak. These results are very sensitive to neutron source and neutron poison reaction rates. For the weak s-process, the main neutron source is the reaction {sup 22}Ne(α,n){sup 25}Mg, which is in competition with {sup 22}Ne(α,γ){sup 26}Mg. The uncertainty of both rates strongly affects the nucleosynthesis predictions from stellar model calculations. In this study, we investigate the impact of the uncertainty in α-captures on {sup 22}Ne on the s-process nucleosynthesis in massive stars both at solar and at very low metallicity. For this purpose, we post-process, with the Nugrid mppnp code, non-rotating and rotating evolutionary models 25M{sub ⊙} stars at two different metallicities: Z = Z{sub ⊙} and Z = 10{sup −5}Z{sub ⊙}, respectively. Our results show that uncertainty of {sup 22}Ne(α,n){sup 25}Mg and {sup 22}Ne(α,γ){sup 26}Mg rates have a significant impact on the final elemental production especially for metal poor rotating models. Beside uncertainties in the neutron source reactions, for fast rotating massive stars at low metallicity we revisit the impact of the neutron poisoning effect by the reaction chain {sup 16}O(n,γ){sup 17}O(α,γ){sup 21}Ne, in competition with the {sup 17}O(α,n){sup 20}Ne, recycling the neutrons captured by {sup 16}O.

  6. Changes in the ionic and protein contents of adult Schistocerca Gregaria compound eyes due to He-Ne laser exposure

    International Nuclear Information System (INIS)

    El-Gindi, A.M.; Osiris, W.G.; El-kes, N.; Abd El-Meguid, A.

    1996-01-01

    The induced change in the concentration of the ionic content such as Na, K, and Ca in the compound eyes of Schistocerca Gregaria was carried out before and after exposure for different periodic times to He-Ne ;laser beam. Total protein and albumin contents in the compound eyes were also determined. The Data indicated that the ionic contents (Na, K and Ca) showed acceptable and significant changes in both the right (R) and left (L) eyes after exposure to different periodic times up to 60 minutes in comparison with the control ones. Moreover, very high significant increase in the total protein content (about 70.2%) as well as significant decrease in the albumin content (about 39.1%) in the right (R) eyes after exposure to He-Ne laser beam for 30 minutes in comparison with the control (unexposed) eyes, were detected. 2 tabs

  7. Metastable He (n=2) - Ne potential interaction calculation

    International Nuclear Information System (INIS)

    Rahal, H.

    1983-10-01

    Diabatic potential terms corresponding to He (2 1 S)-Ne and He (2 3 S)-Ne interactions are calculated. These potentials reproduce the experimental results thermal metastable atom elastic scattering on Ne target. A model which reduces the interaction to a one-electron problem is proposed: the He excited electron. Its interaction with the He + center is reproduced by a ''l'' dependent potential model with a 1/2 behaviour at short range. The electron interaction facing the Ne is described by a l-dependent pseudopotential reproducing with accuracy the electron elastic scattering on a Ne atom. The importance of the corrective term related to the Ne polarizations by the electron and the He + ion is showed in this work. In the modelling problems, the accuracy cannot be better than 0.1 MeV [fr

  8. Uporaba službenih psov za različne namene delovnih procesov

    OpenAIRE

    Rejc, Sara

    2017-01-01

    Pred vami se nahaja diplomsko delo z naslovom Uporaba službenih psov za različne namene delovnih procesov. Glavni namen in cilj diplomskega dela je proučiti in opisati uporabo službenega psa, predvsem v policiji, vojski in zaporih, kar predstavlja jedro tega diplomskega dela. Želeli smo prikazati vsestransko uporabnost psov v svetu ljudi. Ugotovili smo, da je enota reševalnih psov pomemben del ekipe pri iskanju pogrešanih in poškodovanih oseb. Na tem mestu je podrobneje opisano šolanje psa in...

  9. IZBOLJŠANJE MANAGEMENTSKEGA VODENJA V JAVNEM ZAVODU SPLOŠNE BOLNIŠNICE MURSKA SOBOTA

    OpenAIRE

    Maček, Ines

    2015-01-01

    Za magistrsko nalogo z naslovom Izboljšanje managementskega vodenja v javnem zavodu Splošne bolnišnice Murska Sobota smo se odločili, ker menimo, da uspešnost javnega zavoda ni odvisna samo od spretnega vodstva, ampak predvsem od dobrega sodelovanja in komuniciranja na različnih organizacijskih ravneh javnega zavoda. Zaposleni v javnem zavodu morajo nenehno sodelovati in komunicirati med seboj in tudi s svojimi nadrejenimi, le-ti pa morajo tesno sodelovati z vodstvom. Javni zavod brez komu...

  10. L'hydrogène Hydrogen

    Directory of Open Access Journals (Sweden)

    Balaceanu J. C.

    2006-11-01

    Full Text Available La crise pétrolière et le bouleversement du classement économique des énergies primaires qu'elle entraîne conjuguent leurs effets avec ceux d'une sensibilisation de l'opinion au respect de l'environnement pour favoriser l'avènement industriel d'innovations scientifiques et techniques dont l'intervention n'était prévisible que dans un avenir de plusieurs décennies. Le développement de l'énergie électrique nucléaire, qui actuellement s'impose économiquement, implique, pour élargir la pénétration de cette forme d'énergie à toutes les utilisations, une énergie chimique relais permettant un stockage et une régulation de la production; l'hydro- gène obtenu par électrolyse de l'eau semble pouvoir constituer ce combustible relais dans un délai raisonnable en tenant compte des contraintes de pollution. La chaleur nucléaire soulève a fortiori des problèmes identiques, elle peut théoriquement par dissociation thermique étagée de l'eau liquide fournir de l'hydrogène avec des rendements très satisfaisants, mais les problèmes de principe et de technologie posés par la mise en opération d'une suite de transformations chimiques et de séparations impliquant des composés particulièrement réactifs sont ardus et leur inventaire même n'est pas achevé. L'hydrogène, nouveau combustible polyvalent d'une industrie gazière perpétuelle, semble pouvoir bénéficier également, au niveau de son utilisation disséminée, de techniques nouvelles : stockages solides, turbines à hauts rendements, piles à combustible, qui ouvrent le marché de la traction et le marché électrique des installations isolées. Agent de réduction réactif et puissant, l'hydrogène peut également se substituer aux réducteurs conventionnels en métallurgie et donner une dimension nouvelle à l'hydrogénométallurgie par voie sèche ou par voie humide. Mais plus encore la mise en valeur économique des combustibles fossiles abondants . charbon, schistes

  11. Irène Jacob visits CERN

    CERN Document Server

    CERN Bulletin

    2010-01-01

    French actress Irène Jacob, the daughter of physicist Maurice Jacob, visited the ATLAS and CMS control rooms on Monday 17 May together with Italian theatre actor-director Pippo Delbono, in search of inspiration for a short film. The film will be screened at the “nuit des particules” event accompanying this year’s ICHEP.   Pippo Delbono et Irène Jacob discussing their project. “La nuit des particules” (night of the particles) is an event open to the general public that is being organised for the evening of Tuesday, 27 July, to accompany the 35th International Conference on High Energy Physics (ICHEP). ICHEP is a major highlight in every physicist’s calendar, and this year’s edition is being held in Paris from 22 to 28 July. The short film will be screened during the evening, which will include a lecture and a show at the legendary Parisian cinema Le Grand Rex, with a colossal seating capacity of 2 700 spe...

  12. Prospects for Antineutrino Running at MiniBooNE

    OpenAIRE

    Wascko, M. O.

    2006-01-01

    MiniBooNE began running in antineutrino mode on 19 January, 2006. We describe the sensitivity of MiniBooNE to LSND-like nuebar oscillations and outline a program of antineutrino cross-section measurements necessary for the next generation of neutrino oscillation experiments. We describe three independent methods of constraining wrong-sign (neutrino) backgrounds in an antineutrino beam, and their application to the MiniBooNE antineutrino analyses.

  13. "Ne opravilsja jeshtsho posle grippa..." : [luuletused] / Aleksei Koroljov

    Index Scriptorium Estoniae

    Koroljov, Aleksei

    2001-01-01

    Autor endast lk. 44. Sisu: "Ne opravilsja jeshtsho posle grippa..." ; "Tak plohho mne, kak ne bõlo davno..." ; "Vokrug tebja, kak satellit..." ; "Hotja i ne ossobenno ona..." ; Iz dnevnika ; Zdravõi smõsl ; "V ushko igolnoje prodenu..." ; "Zhenshtshine prostitelnõ nedostatki..." ; "Balagurja, taratorja..." "Kogda bõ sprava - rai..." ; 23-i skorõi ; "Velmozhi v rogozhe iz blazhi i drozhi..."

  14. Observation of Two-Proton Radioactivity of 19Mg by Tracking the Decay Products

    International Nuclear Information System (INIS)

    Mukha, I.; Alvarez, M. A. G.; Espino, J.; Gomez-Camacho, J.; Suemmerer, K.; Chatillon, A.; Geissel, H.; Hoffmann, J.; Kurz, N.; Litvinov, Yu.; Nociforo, C.; Ott, W.; Roeckl, E.; Weick, H.; Acosta, L.; Garcia-Ramos, J. E.; Martel, I.; Casarejos, E.; Cortina-Gil, D.; Rodriguez-Tajes, C.

    2007-01-01

    We have observed the two-proton radioactivity of the previously unknown 19 Mg ground state by tracking the decay products in-flight. For the first time, the trajectories of the 2p-decay products, 17 Ne+p+p, have been measured by using tracking microstrip detectors which allowed us to reconstruct the 2p-decay vertices and fragment correlations. The half-life of 19 Mg deduced from the measured vertex distribution is 4.0(15) ps in the system of 19 Mg. The Q value of the 2p decay of the 19 Mg ground state inferred from the measured p-p- 17 Ne correlations is 0.75(5) MeV

  15. Corrosion behavior of Mg/graphene composite in aqueous electrolyte

    International Nuclear Information System (INIS)

    Selvam, M.; Saminathan, K.; Siva, P.; Saha, P.; Rajendran, V.

    2016-01-01

    In the present work, the electrochemical corrosion behavior of magnesium (Mg) and thin layer graphene coated Mg (Mg/graphene) are studied in different salt electrolyte such as NaCl, KCl and Na_2SO_4. The phase structure, crystallinity, and surface morphology of the samples are investigated using X-ray diffraction (XRD) analysis, scanning electron microscopy coupled with energy dispersive X-ray analysis (SEM/EDAX), and Raman spectroscopy techniques. The electrochemical corrosion behavior of the Mg and graphene coated Mg are also investigated using Electrochemical Impedance Spectroscopy (EIS) analysis. The tafel plot reveals that the corrosion of Mg drastically drops when coated with thin layer graphene (Mg/graphene) compared to Mg in KCl electrolyte. Moreover, the EIS confirms that Mg/graphene sample shows improve corrosion resistance and lower corrosion rate in KCl solution compare to all other electrolytes studied in the present system. - Highlights: • The corrosion behavior of magnesium alloy (AZ91) was investigated in three different electrolyte solution. • To study the anti-corrosion behavior of graphene coated with magnesium alloy. • To improve the corrosion resistance for magnesium alloy. • Nyquist plots confirms that MgG shows better corrosion resistance and lower corrosion rate in KCl solution.

  16. Corrosion behavior of Mg/graphene composite in aqueous electrolyte

    Energy Technology Data Exchange (ETDEWEB)

    Selvam, M. [Centre for Nano Science and Technology, KS Rangasamy College of Technology, Tiruchengode, 637215, Tamil Nadu (India); Saminathan, K., E-mail: ksaminath@gmail.com [Centre for Nano Science and Technology, KS Rangasamy College of Technology, Tiruchengode, 637215, Tamil Nadu (India); Siva, P. [Centre for Nano Science and Technology, KS Rangasamy College of Technology, Tiruchengode, 637215, Tamil Nadu (India); Saha, P. [Department of Ceramic Engineering, National Institute of Technology, Rourkela, India-769008 (India); Rajendran, V. [Centre for Nano Science and Technology, KS Rangasamy College of Technology, Tiruchengode, 637215, Tamil Nadu (India)

    2016-04-01

    In the present work, the electrochemical corrosion behavior of magnesium (Mg) and thin layer graphene coated Mg (Mg/graphene) are studied in different salt electrolyte such as NaCl, KCl and Na{sub 2}SO{sub 4}. The phase structure, crystallinity, and surface morphology of the samples are investigated using X-ray diffraction (XRD) analysis, scanning electron microscopy coupled with energy dispersive X-ray analysis (SEM/EDAX), and Raman spectroscopy techniques. The electrochemical corrosion behavior of the Mg and graphene coated Mg are also investigated using Electrochemical Impedance Spectroscopy (EIS) analysis. The tafel plot reveals that the corrosion of Mg drastically drops when coated with thin layer graphene (Mg/graphene) compared to Mg in KCl electrolyte. Moreover, the EIS confirms that Mg/graphene sample shows improve corrosion resistance and lower corrosion rate in KCl solution compare to all other electrolytes studied in the present system. - Highlights: • The corrosion behavior of magnesium alloy (AZ91) was investigated in three different electrolyte solution. • To study the anti-corrosion behavior of graphene coated with magnesium alloy. • To improve the corrosion resistance for magnesium alloy. • Nyquist plots confirms that MgG shows better corrosion resistance and lower corrosion rate in KCl solution.

  17. Study of 19F and 19Ne mirror nuclei

    International Nuclear Information System (INIS)

    Lebrun, Claude.

    1976-01-01

    The electromagnetic properties of the mirror nuclei 19 F and 19 Ne were studied using the 18 O(d,nγ) 19 F, 17 O( 3 He,nγ) 19 Ne and 19 F(p,nγ) 19 Ne reactions. Lifetimes of 8 levels in 19 F and 11 levels in 19 Ne have been measured using the Doppler shift attenuation method. Weak and strong components of M 1 , E 1 and E 2 transition strengths are compared with shell model predictions. M 1 and E 2 transition strengths of conjugated nuclei (A=18 to A=34) are compiled and compared with wide configuration space shell models [fr

  18. The state of the NeXus data format

    International Nuclear Information System (INIS)

    Koennecke, Mark

    2006-01-01

    NeXus is an effort by an international group of scientists to define a common data exchange format for neutron, muon and X-ray scattering. NeXus has six levels: a physical file format, a file structure, rules for storing individual data items in a file, a dictionary of names, instrument definitions and an application programming interface (API) to NeXus files. The authors will present the large steps forward which have been made both with instrument definitions and the NeXus-API

  19. Prenova razsvetljave na Fakulteti za elektrotehniko

    OpenAIRE

    ŠTAJDOHAR, JAN

    2015-01-01

    Pri energetskem pregledu stavbe Fakultete za elektrotehniko v Ljubljani je bilo ugotovljeno, da je razsvetljava prostorov na fakulteti v veliko primerih stara, neprimerna in energetsko potratna. V diplomski nalogi smo se posvetili energetski analizi prenove razsvetljave predavalnice P7 in kabineta AZ101. Pri načrtovanju in izbiri svetil smo upoštevali vse tehnične in energetske smernice za učinkovito razsvetljavo prostorov za izobraževanje. V uvodu smo opisali fizikalne osnove svetlobe, k...

  20. VARNOSTNA POLITIKA NA PODROČJU INFORMATIKE

    OpenAIRE

    Šavor, Gašper

    2011-01-01

    Informacijska tehnologija postaja vse bolj pomemben del poslovanja vsakega podjetja ter ţivljenja vsakega posameznika. Zato je v interesu vseh, da so ključne informacije dobro zaščitene. V prvem delu diplomske naloge smo predstavili informacijske sisteme, njihovo delitev ter vrste. Prav tako smo podrobneje predstavili ţivljenjski cikel ter 4-stopenjski model razvoja informacijskega sistema. V osrednjem delu naloge smo se osredotočili na nevarnosti na področju informatike ter vrste zašči...

  1. A Structural Molar Volume Model for Oxide Melts Part I: Li2O-Na2O-K2O-MgO-CaO-MnO-PbO-Al2O3-SiO2 Melts—Binary Systems

    Science.gov (United States)

    Thibodeau, Eric; Gheribi, Aimen E.; Jung, In-Ho

    2016-04-01

    A structural molar volume model was developed to accurately reproduce the molar volume of molten oxides. As the non-linearity of molar volume is related to the change in structure of molten oxides, the silicate tetrahedral Q-species, calculated from the modified quasichemical model with an optimized thermodynamic database, were used as basic structural units in the present model. Experimental molar volume data for unary and binary melts in the Li2O-Na2O-K2O-MgO-CaO-MnO-PbO-Al2O3-SiO2 system were critically evaluated. The molar volumes of unary oxide components and binary Q-species, which are model parameters of the present structural model, were determined to accurately reproduce the experimental data across the entire binary composition in a wide range of temperatures. The non-linear behavior of molar volume and thermal expansivity of binary melt depending on SiO2 content are well reproduced by the present model.

  2. Cross sections and reaction rates for 23Na(p,n) 23Mg, 27Al(p,n) 27Si, 27Al(α,n) 30P, 29Si(α,n) 32S, and 30Si(α,n) 33S

    International Nuclear Information System (INIS)

    Flynn, D.S.; Sekharan, K.K.; Hiller, B.A.; Laumer, H.; Weil, J.L.; Gabbard, F.

    1978-01-01

    The total neutron production cross sections for the 23 Na(p,n) 23 Mg, 27 Al(p,n) 27 Si, 27 Al(α,n) 30 P, 29 Si(α,n) 32 S, and 30 Si(α,n) 33 S reactions have been measured for bombarding energies from threshold to 6.3 MeV. The neutron detector was a 60-cm diameter sphere of polyethylene with eight 10 BF 3 counters and was insensitive to the angle and energy of the emitted neutrons. Cross sections for inverse reactions have been obtained using the principle of detailed balance. The data have been used to determine parameters for statistical model calculations to facilitate extrapolation of cross sections to higher bombarding energies. These reactions are relevant to problems of nucleosynthesis and stellar evolution and to studies of radiation damage. Nucleosynthesis reaction rates, N/sub A/(sigmav), were determined for the reactions studied and are tabulated for temperatures ranging from 0.4 x 10 9 to 10.0 x 10 9 K

  3. Geochemistry of K/T-boundary Chicxulub ejecta of NE-Mexico

    Science.gov (United States)

    Harting, M.; Deutsch, A.; Rickers, K.

    2003-12-01

    Many K/T sections all over the world contain impact spherules supposed related to the Chicxulub event. This study focus on ejecta layers in NE-Mexican profiles. We carried out systematic XRF and synchrotron radiation measurements on such spherules at the HASYLAB and ANKA facilities as well as microprobe analyses (CAMECA SX50). Area scans on tektite-like material of the Bochil section reveal a pronounced zonation in the inner part, dominated by Ba and Sr whereas secondary CaCO3 dominates in the altered margin. The composition of the spherules from the Mesa-Juan Perez section differ significantly from the Beloc (Haiti) and Bochil tektite glasses. At Mesa-Juan Perez, spherules are either extremely rich in Fe and Ca or consist of smectite, some of those carry carbonate inclusions. Yttrium, La and Ce are zoned within the smectite with concentrations below the detection limit and up to 20 æg/g The Ca-rich inclusions are enriched in Y (up to 35 æg/g) and La (18 æg/g) and, compared to the surrounding smectite, also in Ce (up to 34 æg/g). The Ce enrichment in spherules from the Mesa-Juan Perez section indicates impact-melted carbonates of the Yucatan carbonate platform as possible precursor rocks. Recent investigations focus on the chemistry of melt rock samples from the PEMEX wells Yucatan-6 and Chicxulub-1: Their average composition (mean of 250 data points in wt-percent ) is 61.6 for SiO2, 0.16 for TiO2, 18.07 for Al2O3, 0.01 for Cr2O3, 1.98 for Na2O, 1.5 for FeO, 0.05 for MnO, 0.01 for NiO, 0.31 for MgO, 9.14 for K2O, 3.44 for CaO, and 0.01 for SO2. These results are in some cases comparable to the geochemistry of ejecta glasses, e.g. from Beloc (Haiti).

  4. UTJECAJ POZITIVNE DISKRIMINACIJE NA UKLJUČIVANJE ŽENA NA TRŽIŠTE RADA U REPUBLICI HRVATSKOJ

    OpenAIRE

    Dovranić, Dora; Katavić, Ivica

    2016-01-01

    U početku 21. stoljeća često se koristi pojam pozitivne (afirmativne) diskriminacije. Pozitivna diskriminacija mjera je koju poduzima vlada, neka organizacija ili korporacija s ciljem da se smanje nejednakosti u društvu nastale upravo diskriminacijom, na način da se pružaju određene povlastice onima koji su pretrpjeli neku vrstu diskriminacije. Nastala je u Sjedinjenim Američkim Državama na inicijativu predsjednika Kennedyja, Johnsona i Nixona. Diskriminacija, nažalost, ima mnogo oblika, a ne...

  5. Ground state properties of neutron-rich Mg isotopes the "island of inversion" studied with laser and $\\beta$-NMR spectroscopy

    CERN Document Server

    Kowalska, M

    2006-01-01

    Studies in regions of the nuclear chart in which the model predictions of properties of nuclei fail can bring a better understanding of the strong interaction in the nuclear medium. To such regions belongs the so called "island of inversion" centered around Ne, Na and Mg isotopes with 20 neutrons in which unexpected ground-state spins, large deformations and dense low-energy spectra appear. This is a strong argument that the magic N=20 is not a closed shell in this area. In this thesis investigations of isotope shifts of stable $^{24-26}$Mg, as well as spins and magnetic moments of short-lived $^{29,31}$Mg are presented. The successful studies were performed at the ISOLDE facility at CERN using collinear laser and $\\beta$-NMR spectroscopy techniques. The isotopes were investigated as single-charged ions in the 280 nm transition from the atomic ground state $^2\\!$S$_{1/2}$ to one of the two lowest excited states $^2\\!$P$_{1/2 ,\\,3/2}$ using continuous wave laser beams. The isotope-shift measurements with fluor...

  6. Phase transition and angular momentum dependence of correlations in the rotational spectra of Ne20 and Ne22

    International Nuclear Information System (INIS)

    Satpathy, L.; Schmid, K.W.; Krewald, S.; Faessler, A.

    1974-01-01

    Multi-Configuration-Hartree-Fock (MCHF) calculations with angular momentum projection before the variation of the internal degree of freedom have been performed for the nuclei Ne 20 and Ne 22 . This procedure yields different correlated intrinsic states for the different members of a rotational band. Thus, the angular momentum dependence of correlations has been studied. Experimentally, the ground state spectra of Ne 20 and Ne 22 show properties similar to the phase transitions observed in some rare earth nuclei which have been well reproduced through the present calculations. The calculated spectra show a significant improvement compared to the ones obtained by variation before the angular momentum projection is effected. (author)

  7. Usmerjanje urbanega razvoja na mestni ravni

    Directory of Open Access Journals (Sweden)

    Mojca Šašek Divjak

    1999-01-01

    Full Text Available Kot je poudarjeno v predstavljenem načrtu Kopenhagna, mestni načrt ne more rešiti vseh planskih problemov mesta. Predstavljal naj bi predvideni red, ki pa se pogosto sproti podira glede na nepredvidena dogajanja v prostoru. Probleme je velikokrat treba reševati šele, ko se pokažejo. Zato mora biti mestni načrt zastavljen dovolj prilagodljivo in fleksibilno, da dovoljuje potrebne spremembe. Vendar mora kljub temu dati mestu trdne glavne usmeritve in s tem omogočiti, da meščani lahko izkoristijo priložnosti, ki jih nudi nova doba in uveljavljajo nove kvalitete bivanja.

  8. Effect of different seawater Mg

    NARCIS (Netherlands)

    Mewes, A.; Langer, G.; de Nooijer, L.J.; Bijma, J.; Reichart, G.J.

    2014-01-01

    Magnesium, incorporated in foraminiferal calcite (Mg/CaCC), is used intensively to reconstruct past seawater temperatures but, in addition to temperature, the Mg/CaCC of foraminiferal tests also depends on the ratio of Mg and Ca in seawater (Mg/CaSW). The physiological mechanisms responsible for

  9. DAΦNE magnet power supply system

    International Nuclear Information System (INIS)

    Ricci, R.; Sanelli, C.; Stecchi, A.

    1998-01-01

    The e + -e - , 1020 MeV at center of mass, Particle Accelerator Complex DAΦNE, consists of a linear accelerator (Linac), a damping ring (D.A.), nearly 180 m of transfer lines (T.L.) and two storage rings (S.R.), that intersect each other in two points (I.P.), for Φ particle production. The D.A., T.L. and S.R. magnets are powered by means of 462 power supplies, rating from 100 W to 1 MW. The very different output currents, from 10 A to 2300 A, and output voltages, from 8 V to 1300 V, imposed many different technical solution realized by the world industry. This paper describes the Power Supply System giving also a description of the different typologies, their characteristics and control systems. The paper reports also the power supply performances and gives information on their installation and first year operation period

  10. KN scattering at DA{Phi}NE?

    Energy Technology Data Exchange (ETDEWEB)

    Olin, A

    1995-06-01

    Existing measurements of the KN and K-bar N scattering lengths suffer from large uncertainties, particularly in the I=0 channel. The low energy kaons from {phi} decay available at DA{Phi}NE can be used to improve this situation. Three experimental approaches are discussed: a solid hydrogen target and silicon colorimeter surrounding the collision point. This would also use the magnet and tracking detectors of the FINUDA experiment; a hydrogen TPC is proposed as an active target in the magnetic field of the FINUDA magnet; the FINUDA detector with a CH{sub 2} target could be used to measure an important cross-section. (author). 14 refs., 1 tab., 5 figs.

  11. Martin Szekely : ne plus dessiner

    OpenAIRE

    Mokhtari, Sylvie

    2012-01-01

    Ce livret, publié à l’issue d’une exposition éponyme au Centre Pompidou en 2011-12, présente, sous la conduite de Françoise Guichon les « recherches » et les « projets industriels » du designer qui en 1996 avait déclaré « ne plus dessiner ». Un texte de Philippe-Alain Michaud explicite en deuxième partie de l’opuscule la rencontre de Martin Szekely avec l’artiste Mark Lewis qui réalisa un film à partir du miroir Soleil noir (2007) installé dans les salles de peinture hollandaise de la Nationa...

  12. Active Eruptions in the NE Lau Basin

    Science.gov (United States)

    Resing, J. A.; Embley, R. W.

    2009-12-01

    NE Lau Response Team: K Rubin, E Baker, J Lupton, M Lilley, T Shank, S Merle, R Dziak, T Collasius (Jason 2 Expedition Leader), N Buck, T Baumberger, D Butterfield, D Clague, D Conlin, J Cowen, R Davis, L Evans, J Huber, M Keith, N Keller, P Michael, E Podowski, A-L Reysenbach, K Roe, H Thomas, S Walker. During a May 2009 cruise to W Mata volcano in the NE Lau Basin, we made the first observations of an active eruption on the deep-sea floor. The cruise was organized after volcanic activity was detected at two sites (W Mata volcano and NE Lau Spreading Center, NELSC) during a Nov. 2008 NOAA-PMEL expedition. At that time, both sites had elevated H2 concentrations and volcaniclastic shards in the hydrothermal plumes. Moored hydrophone data since Jan 2009 indicate that the activity at W Mata has been continuous between these expeditions. Results of our cruise and other work suggest that the NE Lau Basin hosts an unusually high level of magmatic activity, making it an ideal location to study the effects of magmatic processes on hydrothermal activity and associated ecosystems. W Mata was visited with 5 ROV Jason 2 dives and 2 dives with the MBARI autonomous mapping vehicle in May 2009. It was actively erupting at the 1200 m deep summit during each, so a hydrophone was deployed locally to collect acoustic data. Ship and shore-based analysis of HD video, molten lava, rocks, sediments, hot spring waters, and micro- and macro biological specimens collected by Jason 2 have provided a wealth of data. The eruption itself was characterized by extrusion of red, molten lava, extensive degassing, formation of large magma bubbles, explosive pyroclast ejection, and the active extrusion of pillow lavas. The erupting magmas are boninite, a relatively rare magma type found only at convergent margins. The hydrothermal fluids are generally acidic and all diffuse fluids collected were microbially active, even those at pH 20 yrs the PMEL-Vents and NSF RIDGE programs have sought to observe

  13. Asymptotic normalization coefficients from the Ne-20(He-3, d)Na-21 reaction and astrophysical factor for Ne-20(p,gamma)Na-21

    Czech Academy of Sciences Publication Activity Database

    Mukhamedzhanov, A. M.; Bém, Pavel; Burjan, Václav; Gagliardi, C. A.; Irgaziev, BF.; Kroha, Václav; Novák, Jan; Piskoř, Štěpán; Šimečková, Eva; Tribble, R. E.; Veselý, František; Vincour, Jiří

    2006-01-01

    Roč. 73, č. 3 (2006), 035806 ISSN 0556-2813 R&D Projects: GA MŠk ME 643; GA AV ČR KSK1048102; GA ČR GA202/05/0302 Institutional research plan: CEZ:AV0Z1048901 Keywords : shell nuclei * S-factor * scattering Subject RIV: BG - Nuclear, Atomic and Molecular Physics, Colliders Impact factor: 3.327, year: 2006

  14. Stellar origin of the 22Ne excess in cosmic rays

    International Nuclear Information System (INIS)

    Casse, M.; Paul, J.A.

    1982-01-01

    The 22 Ne excess at the cosmic-ray source is discussed in terms of a 22 Ne-rich component injected and accelerated by carbon-rich Wolf-Rayet stars. The overabundance of 22 Ne relative to 20 Ne predicted at the surface of these stars is estimated to a factor approx.120 with respect to solar system abundances. In order to give rise to a 22 Ne excess of about 3 at the cosmic-ray sources as inferred from observations, the carbon-rich Wolf-Rayet contribution to the primary cosmic-ray flux is to be at maximum 1/60. This component would be energized by strong stellar winds producing quasi-standing shocks around the Wolf-Rayet stars

  15. One-neutron knockout from Ne24-28 isotopes

    CERN Document Server

    Rodriguez-Tajes, C; Caamano, M; Faestermann, T; Cortina-Gil, D; Zhukov, M; Simon, H; Nilsson, T; Borge, M J G; Alvarez-Pol, H; Winkler, M; Prochazka, A; Nociforo, C; Weick, H; Kanungo, R; Perez-Loureiro, D; Kurtukian, T; Suemmerer, K; Eppinger, K; Perea, A; Chatillon, A; Maierbeck, P; Benlliure, J; Pascual-Izarra, C; Gernhaeuser, R; Geissel, H; Aumann, T; Kruecken, R; Larsson, K; Tengblad, O; Benjamim, E; Jonson, B; Casarejos, E

    2010-01-01

    One-neutron knockout reactions of Ne24-28 in a beryllium target have been studied in the Fragment Separator (FRS), at GSI. The results include inclusive one-neutron knockout cross-sections as well as longitudinal-momentum distributions of the knockout fragments. The ground-state structure of the neutron-rich neon isotopes was obtained from an analysis of the measured momentum distributions. The results indicate that the two heaviest isotopes, Ne-27 and Ne-28, are dominated by a configuration in which a s(1/2) neutron is coupled to an excited state of the Ne-26 and Ne-27 core, respectively. (C) 2010 Elsevier B.V. All rights reserved.

  16. Status of the KM3NeT project

    International Nuclear Information System (INIS)

    Katz, U.F.

    2009-01-01

    KM3NeT is a future research infrastructure in the Mediterranean Sea, hosting a cubic-kilometre scale neutrino telescope and nodes for associated sciences such as marine biology, oceanology and geophysics. The status of the KM3NeT project and the progress made in the EU-funded Design Study is reviewed. Some physics studies indicating the sensitivity of the KM3NeT neutrino telescope are highlighted and selected major technical design options to be further pursued are described. Finally, the remaining steps towards construction of KM3NeT will be discussed. This document reflects the status of the KM3NeT Conceptual Design Report (CDR), which has been presented to the public for the first time at the VLVnT08 Workshop.

  17. Inelastic Proton Scattering on 21Na in Inverse Kinematics

    Science.gov (United States)

    Austin, Roby

    2009-10-01

    R.A.E. Austin, R. Kanungo, S. Reeve, Saint Mary's University; D.G. Jenkins, C.Aa.Diget, A. Robinson, A.G. Tuff, O. Roberts, University of York, UK; P.J. Woods, T. Davinson, G. J. Lotay, University of Edinburgh; C.-Y. Wu, Lawrence Livermore National Laboratory; H. Al Falou, G.C. Ball, M. Djongolov, A. Garnsworthy, G. Hackman, J.N. Orce, C.J. Pearson, S. Triambak, S.J. Williams, TRIUMF; C. Andreiou, D.S. Cross, N. Galinski, R. Kshetri, Simon Fraser University; C. Sumithrarachchi, M.A. Schumaker, University of Guelph; M.P. Jones, S.V. Rigby, University of Liverpool; D. Cline, A. Hayes, University of Rochester; T.E. Drake, University of Toronto; We describe an experiment and associated technique [1] to measure resonances of interest in astrophysical reactions. At the TRIUMF ISAC-II radioactive beam accelerator facility in Canada, particles inelastically scattered in inverse kinematics are detected with Bambino, a δE-E silicon telescope spanning 15-40 degrees in the lab. We use the TIGRESS to detect gamma rays in coincidence with the charged particles to cleanly select inelastic scattering events. We measured resonances above the alpha threshold in ^22Mg of relevance to the rate of break-out from the hot-CNO cycle via the reaction ^ 18Ne(α,p)^21Na. [1] PJ Woods et al. Rex-ISOLDE proposal 424 Cern (2003).

  18. Acúmulo de N, K, Ca, Mg e S na matéria seca da parte aérea de mudas de cajueiro-anão-precoce submetidas a níveis crescentes de matéria orgânica

    Directory of Open Access Journals (Sweden)

    Lima Rosiane de Lourdes Silva de

    2003-01-01

    Full Text Available Com o objetivo de verificar os efeitos de níveis crescentes de matéria orgânica no acúmulo de macronutrientes de porta-enxertos de cajueiro-anão-precoce em 4 estádios de crescimento, foi conduzido experimento na área experimental do Departamento de Irrigação e Drenagem da Universidade Federal do Ceará, em Fortaleza, Ceará, no período de abril a junho de 1995. Utilizou-se como substrato mistura de solo e húmus de minhoca em proporções variadas. Para o plantio, utilizou-se semente de cajueiro-anão-precoce progênie CCP-76. Os tratamentos resultaram da aplicação de cinco níveis de matéria orgânica (0; 100; 200; 300 e 400 cm³/2,5kg solo e 4 épocas de avaliação (15; 30; 45 e 60 dias após a germinação. O delineamento experimental foi o inteiramente casualizado, em esquema de parcela subdividida, com quatro repetições e seis plantas por parcela. Amostras do material vegetal foram submetidas à digestão nítricoperclórica, para determinação de K, Ca, Mg e S, respectivamente, e sulfúrica, para determinar o N. A adição de níveis crescentes de matéria orgânica ao substrato apresentou efeito linear positivo, para o N e K, atingindo o máximo para a dose de 400 cm3. Em relação aos efeitos das épocas, verificou-se efeito linear negativo. Quanto ao Ca, Mg e S, por serem considerados de baixa mobilidade no floema, estes apresentaram tendências de concentração com o incremento de massa seca das mudas.

  19. "Segodnja ne igrajem". Potshemu ? / Ella Agranovskaja

    Index Scriptorium Estoniae

    Agranovskaja, Ella, 1950-

    2006-01-01

    Vene Teatrisse tööle asunud Moskva Kunstiteatri koolstuudio lõpetajatest ja Merle Karusoo ning Toomas Lõhmuste dokumentaaldraamast "Täna me ei mängi" koolstuudio lõpetajate esituses. Tsiteeritakse ka koolstuudio rektori, professori Anatoli Smeljanski muljeid etendusest

  20. Caracterização da infraestrutura e geologia de atrativos naturais na região de Santo Antônio do Rio Abaixo/MG como subsídio para o desenvolvimento do ecoturismo em bases sustentáveis

    Directory of Open Access Journals (Sweden)

    Aline Dias de Sá

    2018-01-01

    Full Text Available O turismo é considerado uma das principais atividades econômicas mundiais por possibilitar o surgimento de negócios para o atendimento das necessidades dos turistas, por outro lado, esta atividade pode desencadear impactos negativos sobre o meio ambiente na ausência de um planejamento e organização adequados. Neste contexto, o município de Santo Antônio do Rio Abaixo (MG é conhecido por seus atrativos naturais, como o Poço do Limão, a Praia do Tabuleiro e o Balneário Benedito Martins Leite, que atraem os turistas para a localidade. Assim, este trabalho objetivou caracterizar, por meio da observação, a infraestrutura para atendimento ao turismo e a geologia local de sete atrativos turísticos, localizados nesse munícipio, identificando o potencial destes para o desenvolvimento de modais turísticos. Notou-se que, de maneira geral, os recursos naturais possuem potencial para o desenvolvimento de diferentes modalidades turísticas, como o ecoturismo, turismo de aventura e geoturismo, todavia, a ausência de sinalização é um aspecto que precisa ser adequado. Em relação à geologia local, verificou-se que predominam rochas gnáissicas correlacionadas aos complexos Dona Rita e Gouveia. Ressalta-se que a geologia da região deve ser observada não apenas para o planejamento do turismo, mas também para o uso e ocupação do solo da região, dada a susceptibilidade natural à erosão de solos provenientes de rochas gnáissicas, evitando-se a degradação dessas áreas.

  1. Políticas e práticas de gestão ambiental: uma análise da gestão dos resíduos da construção civil na cidade de Belo Horizonte (MG

    Directory of Open Access Journals (Sweden)

    Paulo José Silva

    Full Text Available Este artigo tem por objetivo estudar as práticas de gestão de resíduos da construção civil implementadas pelo poder público municipal na cidade de Belo Horizonte (MG. Para isso, empregou-se o método de estudo de caso articulado com o processo de triangulação das técnicas de coleta de dados. A natureza da problemática estudada exigiu a sistematização de um quadro de referências que inclui algumas reflexões teóricas sobre a relação entre Estado, políticas públicas e gestão ambiental. A análise dos resultados evidencia que o poder público da cidade de Belo Horizonte articulou e implementou um conjunto de políticas e práticas de gestão dos resíduos da construção que deu origem a uma policy network, a qual, além de ser por ele coordenada, envolve a participação de diversos atores sociais públicos e privados. Trata-se de uma configuração institucional com um padrão de relações interdependentes que servem de referência para a concretização das práticas de gestão de resíduos da construção civil. Os resultados deste estudo apontam também os benefícios econômicos, sociais e ambientais, além das dificuldades relativas ao processo de institucionalização das referidas políticas e práticas.

  2. Potentiation of the isoproterenol-induced net /sup 45/Ca uptake into the ventricular myocardium of rats by means of 9. cap alpha. -fluorocortisoleacetate, dihydrotachysterole or NaH/sub 2/PO/sub 4/. Cancelling of the potentiation by organic Ca/sup 2 +/ antagonists or K/sup +/ and Mg/sup 2 +/ ions

    Energy Technology Data Exchange (ETDEWEB)

    Hein, R

    1974-01-01

    Myocardial necroses resembling infarctions as well as disseminated myocardial necroses can be induced in rats by high doses of isoprotenerol which effects a maximum stimulation of the decomposition of energy-rich phosphate. This leads to an isoprotenerol-induced increase of the transmembranous Ca/sup + +/ influx, flooding the myocardium with Ca/sup + +/ ions. It is these Ca/sup + +/ ions which then trigger the break-down of the ATP and creatine phosphate fractions by activating the myofibrit-ATPase and impairing the mitochondrial function. It seems that physiological Ca/sup + +/ antagonists such as K/sup +/- or Mg/sup + +/-salts counteract the loss of energy-rich phosphate, thus preventing necroses. A new group of organic Ca/sup + +/ antagonists (verapamil, substance D 600, prenylamine) appears to be even more effective in this respect. Given in appropriate doses, these substances may prevent the isoprotenerol-induced Ca/sup + +/ flooding of the myocardium to a large extent, so that a break-down of the ATP and creatine phosphate fractions is avoided. On the other hand, the isoprotenerol-induced increase of the Ca/sup + +/ influx may be further potentiated by a preliminary treatment of the animals with 9..cap alpha..-fluorocortisoleacetate, dihydrotachysterole or NaH/sub 2/PO/sub 4/. This results in an extreme loss of energy-rich phosphate from the myocardium with excessive enhancement of necrosis production. The findings suggest that - unrecognized so far - Ca/sup + +/ ions play a key role in the generation of myocardial necroses: the present assumption, according to which increased Ca/sup + +/ uptake into damaged myocardial fibres is only a result - or at the most an accompanying symptom - of necrosis can thus no longer be considered valid.

  3. Oscillatory behaviour of Rydberg state total cross sections in the collisions Ne+-He and He+-Ne

    International Nuclear Information System (INIS)

    Andresen, B.; Jensen, K.; Veje, E.

    1976-01-01

    The Ne + -He and He + -Ne collisions have been studied by means of optical spectrometry in the projectile energy range 10-150 keV. Very similar and regular oscillations in the Rydberg state total cross sections are found for HeI in both collisions and for singlet as well as triplet excitation. These oscillations are well described by the Rosenthal model. The HeI 4d sup(1,3)D states display two superimposed oscillations for center-of-mass collision energies above 6.4 keV. This is interpreted as the opening of a third exit channel, believed to be the HeI 4f sup(1,3)F. No, or very little structure is found in the Rydberg state total cross sections for HeII, NeI, NeII and NeIII levels. (Auth.)

  4. Determination of total polyphenolic content in red wines by means of the combined He-Ne laser optothermal window and Folin-Ciocalteu colorimetric assay

    NARCIS (Netherlands)

    Doka, O.; Bicanic, D.

    2002-01-01

    The He-Ne laser (632.8 nm) and the concept of optothermal window (OW), a variant of the open photoacoustic cell, were combined with the Folin-Ciocalteu colorimetry assay to quantitate phenolics in four red wines. The total polyphenolic content in selected red wines varied between 786 and 1630 mg/L

  5. L'Antigone dans la littérature slovéne: situation ou héroine?

    Directory of Open Access Journals (Sweden)

    Evald Koren

    1992-12-01

    Full Text Available Après Ajax (en 1863 et Oedipe àColone (en 1892, Antigone est .la troi­ sìeme tragédie de Sophocle traduite en slovène. En 1912, elle fut mise en scène par le Théâtre national slovène de Ljubljana dans une traduction de Cvetko Golar, cette dernière n'étant publiée que plus tard, en 1924, dans une version assez changée. Le thème d'Antigone, ce mythe littéraire créé par Sophocle, n'émergea pouvtant dans la littérature slovène qu'en 1939 ·lorsque Miran Jarc (1900-1942 publia un texte dramatique plutôt court Antigone de village. Fragment de tragedie. Jarc n'a jamais écrit la tragédie intégrale et, probablement, il n'ava:it même pas l'intention de le faire, ce ˝fragment˝ à la dénomination assez vague, restant done la seule pavtie existante de cette  tragédie.

  6. OGLAŠEVANJE NA SOCIALNEM OMREŽJU FACEBOOK, NA PRIMERU SPLETICNA.SI

    OpenAIRE

    Reisman, Nina

    2011-01-01

    Internet je od svojega razvoja dolgo časa obstajal kot prostor za enostransko komunikacijo. Isto se je dogajalo na televiziji, radiu in časopisih, kjer je javnost sprejemala informacije, ki jih je nekdo pripravil. Tradicionalni mediji so hitro doumeli, da takšna vrsta komunikacije ni naravna in ne predstavlja najboljšega ohranjanja gledalcev in poslušalcev. Začela se je uporabljati dvosmerna komunikacija. Trenutno v svetu najbolje poznan primer dvosmerne komunikacije je socialno omrežje F...

  7. Scattering study of the Ne + NeH{sup +}(v{sub 0} = 0, j{sub 0} = 0) → NeH{sup +} + Ne reaction on an ab initio based analytical potential energy surface

    Energy Technology Data Exchange (ETDEWEB)

    Koner, Debasish; Panda, Aditya N., E-mail: adi07@iitg.ernet.in [Department of Chemistry, Indian Institute of Technology Guwahati, Guwahati 781039 (India); Barrios, Lizandra; González-Lezana, Tomás, E-mail: t.gonzalez.lezana@csic.es [IFF-CSIC, Instituto de Física Fundamental, CSIC, Serrano 123, Madrid 28006 (Spain)

    2016-01-21

    Initial state selected dynamics of the Ne + NeH{sup +}(v{sub 0} = 0, j{sub 0} = 0) → NeH{sup +} + Ne reaction is investigated by quantum and statistical quantum mechanical (SQM) methods on the ground electronic state. The three-body ab initio energies on a set of suitably chosen grid points have been computed at CCSD(T)/aug-cc-PVQZ level and analytically fitted. The fitting of the diatomic potentials, computed at the same level of theory, is performed by spline interpolation. A collinear [NeHNe]{sup +} structure lying 0.72 eV below the Ne + NeH{sup +} asymptote is found to be the most stable geometry for this system. Energies of low lying vibrational states have been computed for this stable complex. Reaction probabilities obtained from quantum calculations exhibit dense oscillatory structures, particularly in the low energy region and these get partially washed out in the integral cross section results. SQM predictions are devoid of oscillatory structures and remain close to 0.5 after the rise at the threshold thus giving a crude average description of the quantum probabilities. Statistical cross sections and rate constants are nevertheless in sufficiently good agreement with the quantum results to suggest an important role of a complex-forming dynamics for the title reaction.

  8. Možnosti prihrankov električne energije pri cestni razsvetljavi, ki se prilagaja količini prometa

    OpenAIRE

    BAVČAR, JERNEJ

    2018-01-01

    V diplomskem delu sem predstavil način in predlog, kako zmanjšati stroške porabe električne energije in svetlobno onesnaževanje z javno razsvetljavo. Pri analizi podatkov sem si pomagal s programom MATLAB. Dobljene vrednosti sem nato obdelal v programskem orodju MS Excel. Na začetku najprej preletim zgodovino razvoja umetne razsvetljave in razvoja javne razsvetljave v Sloveniji in svetu. Za tem opišem veljavne zahteve glede javne razsvetljave in elemente, ki so upoštevani pri načrtovanju n...

  9. Utjecaj ekologije na dizajn ambalaže

    OpenAIRE

    Brčić, Ira

    2015-01-01

    Otpad je sve veći problem zaštite okoliša u cijelom svijetu, pa tako i kod nas. Zaštita okoliša bi trebala biti sastavni dio načina života, a ne obveza stoga bi trebalo odgajati i educirati djecu već od rane dobi da je zaštita okoliša, uključujući otpad nešto o čemu moramo brinuti i voditi računa. Udio ambalažnog otpada neprestano raste i postao je jedan od štetnijih utjecaja na okoliš. Nedostatkom informiranja potrošača raste i gomilanje otpada. Za minimiziranje negativnog utjecaja na oko...

  10. IZBRANE ZNAČILNOSTI MIKRO, MALIH, SREDNJE VELIKIH IN VELIKIH PODJETIJ NA PRIMERU PODJETIJ IZ ZASAVJA

    OpenAIRE

    Jurić, Ana

    2016-01-01

    Za slovensko gospodarstvo so pomembna tako mikro, mala in srednje velika kot velika podjetja. Vsako podjetje, ne glede na svojo velikost, ima svoje prednosti. Mikro podjetja so najmanjša podjetja, njihova prednost pa je, da npr. pri pravni obliki samostojni podjetnik (s. p.) ustanovitelj ne potrebuje začetnega kapitala, tudi ustanovitev je preprosta. Mala podjetja se zaradi majhnosti lahko veliko hitreje prilagodijo spremembam kot velika podjetja. Srednje velika podjetja lahko izkoriščajo pre...

  11. Exclusive measurements of nuclear breakup reactions of 17Ne

    International Nuclear Information System (INIS)

    Wamers, F.; Marganiec, J.; Aksouh, F.; Aksyutina, Y.; Boretzky, K.; Chatillon, A.; Emling, H.; Geissel, H.; Heil, M.; Hoffmann, J.; Karagiannis, C.; Kiselev, O.A.; Kurz, N.; Larsson, K.; Litvinov, Y.A.; Nociforo, C.; Ott, W.; Simon, H.; Suemmerer, K.; Weick, H.; Alvarez-Pol, H.; Beceiro-Novo, S.; Cortina-Gil, D.; Rodriguez-Tajes, C.; Aumann, T.; Panin, V.; Bertulani, C.A.; Borge, M.J.G.; Galaviz, D.; Perea, A.; Tengblad, O.; Chartier, M.; Taylor, J.; Chulkov, L.V.; Egorova, I.A.; Ershova, O.; Langer, C.; Plag, R.; Reifarth, R.; Wimmer, C.; Forssen, C.; Johansson, H.; Jonson, B.; Nilsson, T.; Nyman, G.; Tengborn, E.; Zhukov, M.V.; Fraile, L.M.; Fynbo, H.; Riisager, K.; Grigorenko, L.V.; Hoffmann, D.H.; Richter, A.; Schrieder, G.; Karakoc, M.; Kratz, J.V.; Kulessa, R.; Lantz, M.; Le Bleis, T.; Lemmon, R.; Mahata, K.; Muentz, C.; Stroth, J.; Parfenova, Y.L.; Paschalis, S.; Rossi, D.; Savran, D.; Shul'gina, N.B.

    2014-01-01

    We have studied one-proton-removal reactions of about 500 MeV/u 17 Ne beams on a carbon target at the R 3 B/LAND setup at GSI by detecting beam-like 15 O-p and determining their relative-energy distribution. We exclusively selected the removal of a 17 Ne halo proton, and the Glauber-model analysis of the 16 F momentum distribution resulted in an s 2 contribution in the 17 Ne ground state of about 40 %. (authors)

  12. Financiranje projekata na pomorskom dobru

    Directory of Open Access Journals (Sweden)

    Zoran Tasić

    2018-02-01

    Full Text Available Koncesije otvaraju vrlo osjetljiva politička, ekonomska i pravna pitanja u mnogim državama svijeta. Samo definiranje pojma koncesije često je komplicirana i ne sasvim jasna zadaća. OECD je prihvatila definiciju koncesije kao: ’’davanje prava privatnom trgovačkom društvu da može gospodarski upravljati određenom infrastrukturnim uslugama i za to zarađivati naknadu. Koncesionar dobija u posjed određene objekte (ali vlasništvo na tim objektima ostaje u rukama države te ih koristi u svrhu obavljanja određene djelatnosti ili usluge sukladno odredbama ugovora’’. Hrvatsko pravo definira koncesije načelno kao pravo stečeno temeljem ugovora o koncesiji, a sukladno uvjetima sadržanim u odluci o davanju koncesije (koju je donijelo odgovarajuće upravno tijelo, a u odnosu na pomorsko dobro, specifično, kao pravo državne vlasti da može dio pomorskog dobra, koje je inače dobro izvan pravnog prometa (res extra commercium, isključiti iz opće uporabe bilo dijelom ili u cijelosti, i dati ga fizičkoj ili pravnoj osobi na gospodarsko korištenje sukladno određenim prostornim planovima. Građevine i drugi objekti izgrađeni na pomorskom dobru čine njegov sastavni dio. Zakonom je jasno određeno da nikakva stvarna prava nisu dopuštena na pomorskom dobru, uključivo i na objektima izgrađenima na njemu. Projekti na pomorskom dobru često uključuju velike infrastrukturne projekte, razvoje luka i marina, koji iziskuju značajna financijska sredstva. Banke koje financiraju takve projekte zahtijevaju organiziran i transparentan zakonski okvir koncesija, slobodu ugovaranja, pravnu zaštitu svih strana uključenih u projekt (uključivo i mogućnost međunarodne arbitraže. (...

  13. Vpliv konfucija na sodobno izobraževanje na Kitajskem

    Directory of Open Access Journals (Sweden)

    Katja Skitek

    2009-12-01

    Full Text Available Izobraževanje na Kitajskem je bilo vedno trdno povezano s Konfucijem in konfucianizmom, kar pa ni čudno, saj je bil Konfucij prvi, ki je poudarjal moč z nanja in izobraževanja. LR Kitajska je v zadnjih petdesetih letih počasi in postopoma začela uveljavljati določene spremembe v vzgojno-izobraževalni sistem. Kakšne so te spremembe in koliko nanje še vedno vpliva konfucianizem, bo osrednja tema pričujočega članka. Konfucianizem danes na Kitajskem ni preveč popularen, izobraženci pa so se razporedili v dve skupini: eni trdijo, da je njegov vpliv še vedno velik, drugi pa zatrjujejo, da nima več nobenega vpliva na sodobno življenje. Katera stran ima prav? Konfucij je v prvi vrsti poudarjal pomembnost moralnih vrednot vsakega človeka in prav moralne vrednote, za katere se je zavzemal, so še danes trdno zasidrane v kitajski kulturi. Ali je torej sploh mogoče popolnoma izriniti Konfucija iz sodobnega izobraževanja?

  14. Quasicrystal-reinforced Mg alloys.

    Science.gov (United States)

    Kyun Kim, Young; Tae Kim, Won; Hyang Kim, Do

    2014-04-01

    The formation of the icosahedral phase (I-phase) as a secondary solidification phase in Mg-Zn-Y and Mg-Zn-Al base systems provides useful advantages in designing high performance wrought magnesium alloys. The strengthening in two-phase composites (I-phase + α -Mg) can be explained by dispersion hardening due to the presence of I-phase particles and by the strong bonding property at the I-phase/matrix interface. The presence of an additional secondary solidification phase can further enhance formability and mechanical properties. In Mg-Zn-Y alloys, the co-presence of I and Ca 2 Mg 6 Zn 3 phases by addition of Ca can significantly enhance formability, while in Mg-Zn-Al alloys, the co-presence of the I-phase and Mg 2 Sn phase leads to the enhancement of mechanical properties. Dynamic and static recrystallization are significantly accelerated by addition of Ca in Mg-Zn-Y alloy, resulting in much smaller grain size and more random texture. The high strength of Mg-Zn-Al-Sn alloys is attributed to the presence of finely distributed Mg 2 Sn and I-phase particles embedded in the α -Mg matrix.

  15. Single crystal structures of the new vanadates CuMgVO{sub 4} and AgMgVO{sub 4}

    Energy Technology Data Exchange (ETDEWEB)

    Ben Yahia, Hamdi, E-mail: Hyahia@qf.org.qa [Research Institute of Electrochemical Energy, National Institute of Advanced Industrial Science and Technology (AIST), 1-8-31 Midorigaoka, Ikeda, Osaka 563-8577 (Japan); Qatar Environment and Energy Research Institute, Hamad Bin Khalifa University, Qatar Foundation, PO Box 5825, Doha (Qatar); Shikano, Masahiro, E-mail: shikano.masahiro@aist.go.jp [Research Institute of Electrochemical Energy, National Institute of Advanced Industrial Science and Technology (AIST), 1-8-31 Midorigaoka, Ikeda, Osaka 563-8577 (Japan); Essehli, Rachid; Belharouak, Ilias [Qatar Environment and Energy Research Institute, Hamad Bin Khalifa University, Qatar Foundation, PO Box 5825, Doha (Qatar)

    2016-08-01

    The new compounds CuMgVO{sub 4} and AgMgVO{sub 4} have been synthesized by a solid state reaction route. Their crystal structures were determined from single-crystal X-ray diffraction data. CuMgVO{sub 4} crystallizes with Na{sub 2}CrO{sub 4}-type structure with space group Cmcm, a = 5.6932 (10), b = 8.7055 (15), c = 6.2789 (10) Å, V = 311.20 (9) Å{sup 3}, and Z = 4, whereas AgMgVO{sub 4} crystallizes in the maricite-type structure with space group Pnma, a = 9.4286 (14), b = 6.7465 (10), c = 5.3360 (8) Å, V = 339.42 (9) Å{sup 3}, and Z = 4. Both structures of CuMgVO{sub 4}, and AgMgVO{sub 4} contain MgO{sub 4} chains made up of edge-sharing MgO{sub 6} octahedra. In CuMgVO{sub 4} the MgO{sub 4} chains are interconnected through CuVO{sub 4} double chains made up of VO{sub 4} and CuO{sub 4} tetrahedra sharing corners and edges, however in AgMgVO{sub 4} the chains are interlinked by the VO{sub 4} and AgO{sub 4} tetrahedra sharing only corners. - Highlights: • We have been able to grow CuMgVO{sub 4} and AgMgVO{sub 4} single crystals. • We solved their crystal structures using single crystal data. • We compared the crystal structures of CuMgVO{sub 4} and AgMgVO{sub 4}.

  16. Electron-impact cross sections of Ne

    International Nuclear Information System (INIS)

    Tsurubuchi, S.; Arakawa, K.; Kinokuni, S.; Motohashi, K.

    2000-01-01

    Electron-impact absolute emission cross sections were measured for the 3p→3s transitions of Ne. Excitation functions of the 3s→2p first resonance lines were measured in the energy range from the threshold to 1000 eV by a polarization-free optical method and relative cross sections were normalized to the absolute values, (41.0±5.4)x10 -19 cm 2 for the 73.6 nm line and (7.1±1.0)x10 -19 cm 2 for the 74.4 nm line, which were determined at 500 eV. The integrated level-excitation cross sections of Suzuki et al for the 1s 2 and 1s 4 levels were combined with the corresponding 3p→3s cascade cross sections obtained in this paper to give absolute emission cross sections for the resonance lines. The level-excitation cross sections of the 1s 2 and 1s 4 states in Paschen notation were determined from the threshold to 1000 eV by subtracting 3p→3s cascade cross sections from the corresponding 3s→2p emission cross sections of the resonance lines. A large cascade contribution is found in the emission cross section of the resonance lines. It is 28.5% for the 73.6 nm line and 49.6% for the 74.4 nm line at 40 eV, and 17.0 and 61.8%, respectively, at 300 eV. (author)

  17. WE FRIENDS, Lääne-Eesti arengupartnerlus / Ingrit Kera

    Index Scriptorium Estoniae

    Kera, Ingrit

    2006-01-01

    Naised saavad osa hiidlaste kirjutatud europrojektist "We Friends", mille eesmärk on Lääne-Eesti madala konkurentsivõimega naiste ja lapsi üksi kasvatavate noorte emade tööhõivele kaasaaitamine

  18. Coulomb and nuclear excitations of narrow resonances in 17Ne

    Directory of Open Access Journals (Sweden)

    J. Marganiec

    2016-08-01

    Full Text Available New experimental data for dissociation of relativistic 17Ne projectiles incident on targets of lead, carbon, and polyethylene targets at GSI are presented. Special attention is paid to the excitation and decay of narrow resonant states in 17Ne. Distributions of internal energy in the O15+p+p three-body system have been determined together with angular and partial-energy correlations between the decay products in different energy regions. The analysis was done using existing experimental data on 17Ne and its mirror nucleus 17N. The isobaric multiplet mass equation is used for assignment of observed resonances and their spins and parities. A combination of data from the heavy and light targets yielded cross sections and transition probabilities for the Coulomb excitations of the narrow resonant states. The resulting transition probabilities provide information relevant for a better understanding of the 17Ne structure.

  19. Complementarity and completed trials: reforming the Ne bis in idem ...

    African Journals Online (AJOL)

    Nnamdi Azikiwe University Journal of International Law and Jurisprudence ... This paper is concerned with the question whether article 20(3) of the Rome Statute is ... Rome Statute, Ne bis in idem, double jeopardy, International Criminal Court ...

  20. 77 FR 6481 - Television Broadcasting Services; Lincoln, NE

    Science.gov (United States)

    2012-02-08

    ...] Television Broadcasting Services; Lincoln, NE AGENCY: Federal Communications Commission. ACTION: Final rule... power television rulemaking petitions requesting channel substitutions in May 2011, it subsequently... CFR Part 73 Television. Federal Communications Commission. Barbara A. Kreisman, Chief, Video Division...