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Sample records for br te dy

  1. Measurement of cross sections producing short-lived nuclei by 14 MeV neutron. Br, Te, Dy, Ho, Yb

    Energy Technology Data Exchange (ETDEWEB)

    Sakane, H.; Matsumoto, T.; Yamamoto, H.; Kawade, K. [Nagoya Univ. (Japan); Iida, T.; Takahashi, A.

    1997-03-01

    Nine neutron activation cross sections producing the nuclei with half-lives between 2 min and 57 min have been measured at energy range between 13.4 and 14.9 MeV for Br, Te, Dy, Ho, Yb. The cross sections of {sup 81}Br(n,p){sup 81m}Se, {sup 128}Te(n,p){sup 128m}Sb, {sup 128}Te(n,{alpha}){sup 125m}Sn, {sup 164}Dy(n,p){sup 164}Tb, {sup 165}Ho(n,{alpha}){sup 162}Tb, {sup 176}Yb(n,p){sup 176}Tm were newly obtained at the six energy points between 13.4-14.9 MeV, although the previous results have been obtained at one energy point. {sup 79}Br(n,2n){sup 78}Br, {sup 164}Dy(n,p){sup 164}Tb are compared with evaluated data of JENDL-3.2. The evaluations for these reactions agree reasonably well with experimental results. The cross sections of (n,p) reaction are compared with systematics by Kasugai et. al. The systematics agrees with experimental results. (author)

  2. Octadecabromidobis(dicarbidodecadysprosium, [Dy10Br18(C22

    Directory of Open Access Journals (Sweden)

    Kathrin Daub

    2008-01-01

    Full Text Available Single crystals of [Dy10Br18(C22] were obtained during the reaction of DyBr3 with dysprosium metal and graphite in a sealed tantalum container. In the crystal structure, the Dy atoms form dimers of edge-sharing octahedra, each encapsulating a C2 unit. The metal atoms are surrounded by Br atoms above the cluster edges and vertices, respectively. The dimers are connected to each other by Br atoms, leading to a three-dimensional network. [Dy10Br18(C22] is isotypic with its iodido analogue [Dy10I18(C22].

  3. Study of Dy-doped Bi2Te3: thin film growth and magnetic properties

    Science.gov (United States)

    Harrison, S. E.; Collins-McIntyre, L. J.; Zhang, S.-L.; Baker, A. A.; Figueroa, A. I.; Kellock, A. J.; Pushp, A.; Parkin, S. S. P.; Harris, J. S.; van der Laan, G.; Hesjedal, T.

    2015-06-01

    Breaking the time-reversal symmetry (TRS) in topological insulators (TIs) through ferromagnetic doping is an essential prerequisite for unlocking novel physical phenomena and exploring potential device applications. Here, we report the successful growth of high-quality (DyxBi1-x)2Te3 thin films with Dy concentrations up to x = 0.355 by molecular beam epitaxy. Bulk-sensitive magnetisation studies using superconducting quantum interference device magnetometry find paramagnetic behaviour down to 2 K for the entire doping series. The effective magnetic moment, μeff, is strongly doping concentration-dependent and reduces from ˜12.6 μB Dy-1 for x = 0.023 to ˜4.3 μB Dy-1 for x = 0.355. X-ray absorption spectra and x-ray magnetic circular dichroism (XMCD) at the Dy M4,5 edge are employed to provide a deeper insight into the magnetic nature of the Dy3+-doped films. XMCD, measured in surface-sensitive total-electron-yield detection, gives μeff = 4.2 μB Dy-1. The large measured moments make Dy-doped films interesting TI systems in which the TRS may be broken via the proximity effect due to an adjacent ferromagnetic insulator.

  4. Crystal growth and characterization of undoped and Dy-doped TlPb2Br5 for infrared lasers and nuclear radiation detection

    Science.gov (United States)

    Hömmerich, U.; Brown, E.; Kabir, A.; Hart, D.; Trivedi, S. B.; Jin, F.; Chen, H.

    2017-12-01

    We report results of the crystal growth and characterization of undoped and Dy-doped TlPb2Br5 for applications in infrared (IR) lasers and nuclear radiation detection. TlPb2Br5 (TPB) was synthesized from commercial starting materials of PbBr2 and TlBr and further purified through a combination of zone-refinement and directional solidification. For doping experiments, 2 wt% of DyBr3 was added to the purified TPB material. Crystal growth of TPB and Dy: TPB was carried out in a two-zone tube furnace by a vertical Bridgman method. Following optical excitation at ∼1.36 μm, the Dy: TPB crystal exhibited efficient mid-IR emission bands centered at 2.87 μm and 4.35 μm with room-temperature lifetimes of 9.5 ms and 5.2 ms, respectively. The peak emission cross-sections were determined to be ∼0.8 × 10-20 cm2 and ∼0.5 × 10-20 cm2, respectively, which makes Dy: TPB a promising candidate for mid-IR laser applications. Besides its potential as a solid-state laser host, an undoped TPB crystal was also tested for gamma-ray detection. Using Cs-137 and Am-241 sources resulted in energy resolutions for gamma-rays as good as 1-2% (FWHM) at room-temperature under non-optimized conditions.

  5. X-ray magnetic circular dichroism study of Dy-doped Bi2Te3 topological insulator thin films

    Science.gov (United States)

    Figueroa, A. I.; Baker, A. A.; Harrison, S. E.; Kummer, K.; van der Laan, G.; Hesjedal, T.

    2017-01-01

    Magnetic doping of topological insulators (TIs) is crucial for unlocking novel quantum phenomena, paving the way for spintronics applications. Recently, we have shown that doping with rare earth ions introduces large magnetic moments and allows for high doping concentrations without the loss of crystal quality, however no long range magnetic order was observed. In Dy-doped Bi2Te3 we found a band gap opening above a critical doping concentration, despite the paramagnetic bulk behavior. Here, we present a surface-sensitive x-ray magnetic circular dichroism (XMCD) study of an in situ cleaved film in the cleanest possible environment. The Dy M4,5 absorption spectra measured with circularly polarized x-rays are fitted using multiplet calculations to obtain the effective magnetic moment. Arrott-Noakes plots, measured by the Dy M5 XMCD as a function of field at low temperatures, give a negative transition temperature. The evaporation of a ferromagnetic Co thin film did not introduce ferromagnetic ordering of the Dy dopants either; instead a lowering of the transition temperature was observed, pointing towards an antiferromagnetic ordering scenario. This result shows that there is a competition between the magnetic exchange interaction and the Zeeman interaction. The latter favors the Co and Dy magnetic moments to be both aligned along the direction of the applied magnetic field, while the exchange interaction is minimized if the Dy and Co atoms are antiferromagnetically coupled, as in zero applied field.

  6. Novel Ge-Ga-Te-CsBr glass system with ultrahigh resolvability of halide.

    Science.gov (United States)

    Cheng, Ci; Wang, Xunsi; Xu, Tiefeng; Zhu, Qingde; Sun, Lihong; Pan, Zhanghao; Nie, Qiuhua; Zhang, Peiqing; Wu, Yuehao; Dai, Shixun; Shen, Xiang; Zhang, Xianghua

    2015-11-05

    CO2 molecule, one of the main molecules to create new life, should be probed accurately to detect the existence of life in exoplanets. The primary signature of CO2 molecule is approximately 15 μm, and traditional S- and Se-based glass fibers are unsuitable. Thus, Te-based glass is the only ideal candidate glass for far-infrared detection. In this study, a new kind of Te-based chalcohalide glass system was discovered with relatively stable and large optical band gap. A traditional melt-quenching method was adopted to prepare a series of (Ge15Ga10Te75)100-x (CsBr)x chalcogenide glass samples. Experiment results indicate that the glass-forming ability and thermal properties of glass samples were improved when CsBr was added in the host of Ge-Ga-Te glass. Ge-Ga-Te glass could remarkably dissolve CsBr content as much as 85 at.%, which is the highest halide content in all reports for Te-based chalcohalide glasses. Moreover, ΔT values of these glass samples were all above 100 °C. The glass sample (Ge15Ga10Te75)65 (CsBr)35 with ΔT of 119 °C was the largest, which was 7 °C larger than that of Ge15Ga10Te75 host glass. The infrared transmission spectra of these glasses show that the far-infrared cut-off wavelengths of (Ge15Ga10Te75)100-x (CsBr)x chalcogenide glasses were all beyond 25 μm. In conclusion, (Ge15Ga10Te75)100-x (CsBr)x chalcogenide glasses are potential materials for far-infrared optical application. Copyright © 2015 Elsevier B.V. All rights reserved.

  7. Crystal structure, magnetization, {sup 125}Te NMR, and Seebeck coefficient of Ge{sub 49}Te{sub 50}R{sub 1} (R = La, Pr, Gd, Dy, and Yb)

    Energy Technology Data Exchange (ETDEWEB)

    Levin, E.M., E-mail: levin@iastate.edu [Division of Materials Sciences and Engineering, US Department of Energy Ames Laboratory, Ames, IA 50011 (United States); Department of Physics and Astronomy, Iowa State University, Ames, IA 50011 (United States); Cooling, C. [Division of Materials Sciences and Engineering, US Department of Energy Ames Laboratory, Ames, IA 50011 (United States); Bud’ko, S.L. [Division of Materials Sciences and Engineering, US Department of Energy Ames Laboratory, Ames, IA 50011 (United States); Department of Physics and Astronomy, Iowa State University, Ames, IA 50011 (United States); Straszheim, W.E. [Division of Materials Sciences and Engineering, US Department of Energy Ames Laboratory, Ames, IA 50011 (United States); Lograsso, T.A. [Division of Materials Sciences and Engineering, US Department of Energy Ames Laboratory, Ames, IA 50011 (United States); Department of Materials Sciences and Engineering, Iowa State University, Ames, IA 50011 (United States)

    2017-05-01

    GeTe, a self-doping semiconductor, is a well-known base compound for thermoelectric and phase-change materials. It is known, that replacement of Ge in Ag{sub 6.5}Sb{sub 6.5}Ge{sub 37}Te{sub 50} (TAGS-85) material by rare earth Dy significantly enhances both the power factor and thermoelectric figure of merit. Here we demonstrate how replacement of Ge in GeTe by rare earths with different atomic size and localized magnetic moments affect XRD patterns, magnetization, {sup 125}Te NMR spectra and spin-lattice relaxation, and the Seebeck coefficient of the alloys with a nominal composition of Ge{sub 49}Te{sub 50}R{sub 1} (R = La, Pr, Gd, Dy, and Yb). SEM, EDS and WDS data show that rare earth atoms in the matrix are present at smaller extent compared to a nominal composition, whereas rare earth also is present in inclusions. Rare earths affect the Seebeck coefficient, which is a result of interplay between the reduction due to higher carrier concentration and enhancement due to magnetic contribution. The effect of replacement of Ge in GeTe by Dy on the Seebeck coefficient is smaller than that observed in Ag{sub 6.5}Sb{sub 6.5}Ge{sub 36} Te{sub 50}Dy{sub 1}. This can be explained by larger amount of rare earth, which can be embedded into the lattice of materials containing [Ag + Sb] atomic pairs and possible effect from these pairs. - Highlights: • The effects of rare earth in Ge{sub 49}Te{sub 50}R{sub 1} (R = La, Pr, Gd, Dy, and Yb) are studied. • Rare earth atoms in the matrix are present at smaller extent compared to a nominal composition. • The effect on the Seebeck coefficient is a result from carrier concentration and magnetic contribution.

  8. Measurement of $d\\sigma/dy$ of Drell-Yan $e^+e^-$ pairs in the $Z$ Mass Region from $p\\bar{p}$ Collisions at $\\sqrt{s}=1.96$ TeV

    Energy Technology Data Exchange (ETDEWEB)

    Aaltonen, Timo Antero; /Helsinki Inst. of Phys.; Adelman, Jahred A.; /Chicago U., EFI; Gonzalez, Barbara Alvarez; /Cantabria Inst. of Phys.; Amerio, Silvia; /Padua U., CISAS; Amidei, Dante E.; /Michigan U. /INFN, Padua; Anastassov, Anton Iankov; /Northwestern U.; Annovi, Alberto; /Frascati; Antos, Jaroslav; /Comenius U.; Apollinari, Giorgio; /Fermilab; Appel, Jeffrey A.; /Fermilab; Apresyan, Artur; /Purdue U. /Waseda U.

    2010-03-01

    We report on a CDF measurement of the total cross section and rapidity distribution, d{sigma}/dy, for q{bar q} {yields} {gamma}{sup *}/Z {yields} e{sup +} e {sup -} events in the Z boson mass region (66 < M {sub ee} < 116 GeV/c {sub 2}) produced in p{bar p} collisions at {radical}s = 1.96 TeV with 2.1 fb{sup -1} of integrated luminosity. The measured cross section of 257 {+-} 16pb and d{sigma}/dy distribution are compared with Next-to-Leading-Order (NLO) and Next-to-Next-to-Leading-Order (NNLO) QCD theory predictions with CTEQ and MRST/MSTW parton distribution functions (PDFs). There is good agreement between the experimental total cross section and d{sigma}/dy measurements with theoretical calcualtion with the most recent NNLO PDFs.

  9. Reversible switching between p- and n-type conduction in the semiconductor Ag10Te4Br3.

    Science.gov (United States)

    Nilges, Tom; Lange, Stefan; Bawohl, Melanie; Deckwart, Jens Markus; Janssen, Martin; Wiemhöfer, Hans-Dieter; Decourt, Rodolphe; Chevalier, Bernard; Vannahme, Julia; Eckert, Hellmut; Weihrich, Richard

    2009-02-01

    Semiconductors are key materials in modern electronics and are widely used to build, for instance, transistors in integrated circuits as well as thermoelectric materials for energy conversion, and there is a tremendous interest in the development and improvement of novel materials and technologies to increase the performance of electronic devices and thermoelectrics. Tetramorphic Ag(10)Te(4)Br(3) is a semiconductor capable of switching its electrical properties by a simple change of temperature. The combination of high silver mobility, a small non-stoichiometry range and an internal redox process in the tellurium substructure causes a thermopower drop of 1,400 microV K(-1), in addition to a thermal diffusivity in the range of organic polymers. The capability to reversibly switch semiconducting properties from ionic to electronic conduction in one single compound simply by virtue of temperature enables novel electronic devices such as semiconductor switches.

  10. Novel germanetellones: XYGe=Te (X, Y = H, F, Cl, Br, I and CN) - structures and energetics. Comparison with the first synthetic successes.

    Science.gov (United States)

    Jaufeerally, Naziah B; Abdallah, Hassan H; Ramasami, Ponnadurai; Schaefer, Henry F

    2014-03-14

    No stable germanetellone was described until Tbt(Dis)Ge=Te and Tbt(Tip)Ge=Te (Tbt = 2,4,6-tris[bis(trimethylsilyl)methyl]phenyl, Dis = bis(trimethylsilyl)methyl and Tip = 2,4,6-triisopropylphenyl) were reported in 1997. Following these initial experiments, there has arisen considerable interest in Ge[double bond, length as m-dash]Te systems. An obvious question is: why have the simple XYGe=Te (X, Y = H, F, Cl, Br, I and CN) molecules not yet been isolated? In view of the present situation, theoretical information may be of great help for further advances in germanetellone chemistry. A systematic investigation of the XYGe=Te molecules is carried out using the second order Møller-Plesset perturbation theory (MP2) and density functional theory (DFT). The structures and energetics, including ionization potentials (IPad and IPad(ZPVE)), four different forms of neutral-anion separations (EAad, EAad(ZPVE), VEA and VDE) and the singlet-triplet gaps, are reported. The electronegativity (χ) reactivity descriptor for the halogens (F, Cl, Br and I) and the natural charge separations of the Ge=Te moiety are used to assess the interrelated properties of germanetellone and its derivatives. The results are analyzed, discussed and compared with analogous studies of telluroformaldehyde, silanetellone and their derivatives. The thermodynamic viabilities of some of the novel germanetellones have also been evaluated in terms of the bond dissociation enthalpies of Tbt(Dis)Ge=Te and Tbt(Tip)Ge=Te. The simple mono-substituted germanetellones appear to be slightly more thermodynamically favored than Tbt(Dis)Ge=Te and Tbt(Tip)Ge=Te, since the bond dissociation enthalpies of these kinetically stabilized germanetellones are about 28 and 51 kcal mol(-1) lower, respectively.

  11. Measurement of d sigma/dy of Drell-Yan e+ e- pairs in the Z Mass Region from p anti-p Collisions at s88(1/2) = 1.96-TeV

    Energy Technology Data Exchange (ETDEWEB)

    Aaltonen, T.; /Helsinki Inst. of Phys.; Adelman, J.; /Chicago U., EFI; Akimoto, T.; /Tsukuba U.; Alvarez Gonzalez, B.; /Cantabria Inst. of Phys.; Amerio, S.; /Padua U. /INFN, Padua; Amidei, D.; /Michigan U.; Anastassov, A.; /Northwestern U.; Annovi, A.; /Frascati; Antos, J.; /Comenius U.; Apollinari, G.; /Fermilab; Apresyan, A.; /Purdue U. /Waseda U.

    2009-08-01

    We report on a CDF measurement of the total cross section and rapidity distribution, d{sigma}/dy, for q{bar q} {yields} {gamma}*/Z {yields} e{sup +}e{sup -} events in the Z boson mass region (66 < M{sub ee} < 116 GeV/c{sup 2}) produced in p{bar p} collisions at {radical}s = 1.96 TeV with 2.1 fb{sup -1} of integrated luminosity. The measured cross section of 256 {+-} 16 pb and d{sigma}/dy distribution are compared with Next-to-Leading-Order and Next-to-Next-to-Leading-Order QCD theory predictions with CTEQ and MRST parton distribution functions (PDFs). There is good agreement between data and theory except at large rapidity for which further tuning of PDF models may be needed.

  12. Cascading electron and hole transfer dynamics in a CdS/CdTe core-shell sensitized with bromo-pyrogallol red (Br-PGR): slow charge recombination in type II regime

    Science.gov (United States)

    Maity, Partha; Debnath, Tushar; Chopra, Uday; Ghosh, Hirendra Nath

    2015-01-01

    Ultrafast cascading hole and electron transfer dynamics have been demonstrated in a CdS/CdTe type II core-shell sensitized with Br-PGR using transient absorption spectroscopy and the charge recombination dynamics have been compared with those of CdS/Br-PGR composite materials. Steady state optical absorption studies suggest that Br-PGR forms strong charge transfer (CT) complexes with both the CdS QD and CdS/CdTe core-shell. Hole transfer from the photo-excited QD and QD core-shell to Br-PGR was confirmed by both steady state and time-resolved emission spectroscopy. Charge separation was also confirmed by detecting electrons in the conduction band of the QD and the cation radical of Br-PGR as measured from femtosecond transient absorption spectroscopy. Charge separation in the CdS/Br-PGR composite materials was found to take place in three different pathways, by transferring the photo-excited hole of CdS to Br-PGR, electron injection from the photo-excited Br-PGR to the CdS QD, and direct electron transfer from the HOMO of Br-PGR to the conduction band of the CdS QD. However, in the CdS/CdTe/Br-PGR system hole transfer from the photo-excited CdS to Br-PGR and electron injection from the photo-excited Br-PGR to CdS take place after cascading through the CdTe shell QD. Charge separation also takes place via direct electron transfer from the Br-PGR HOMO to the conduction band of CdS/CdTe. Charge recombination (CR) dynamics between the electron in the conduction band of the CdS QD and the Br-PGR cation radical were determined by monitoring the bleach recovery kinetics. The CR dynamics were found to be much slower in the CdS/CdTe/Br-PGR system than in the CdS/Br-PGR system. The formation of the strong CT complex and the separation of charges cascading through the CdTe shell help to slow down charge recombination in the type II regime.Ultrafast cascading hole and electron transfer dynamics have been demonstrated in a CdS/CdTe type II core-shell sensitized with Br

  13. First measurement of sigma (p anti-p ---> Z) . Br (Z ---> tau tau) at s**(1/2) = 1.96- TeV

    Energy Technology Data Exchange (ETDEWEB)

    Abazov, V.M.; Abbott, B.; Abolins, M.; Acharya, B.S.; Adams, M.; Adams, T.; Agelou, M.; Agram, J.-L.; Ahn, S.H.; Ahsan, M.; Alexeev, G.D.; Alkhazov, G.; Alton, A.; Alverson, G.; Alves, G.A.; Anastasoaie, M.; Andeen, T.; Anderson, S.; Andrieu, B.; Arnoud, Y.; Askew, A.; /Buenos Aires U. /Rio de Janeiro, CBPF /Rio de Janeiro State U. /Sao

    2004-12-01

    The authors present a measurement of the cross section for Z production times the branching fraction to {tau} leptons, {sigma} {center_dot} Br(Z {yields} {tau}{sup +}{tau}{sup -}), in p{bar p} collisions at {radical}s = 1.96 TeV in the channel in which one {tau} decays into {mu}{nu}{sub {mu}}{nu}{sub {tau}}, and the other into hadrons + {nu}{sub {tau}} or e{nu}{sub e}{nu}{sub {tau}}. The data sample corresponds to an integrated luminosity of 226 pb{sup -1} collected with the D0 detector at the Fermilab Tevatron collider. The final sample contains 2008 candidate events with an estimated background of 55%. From this they obtain {sigma} {center_dot} Br(Z {yields} {tau}{sup +}{tau}{sup -}) = 237 {+-} 15(stat) {+-} 18(sys) {+-} 15(lum) pb, in agreement with the standard model prediction.

  14. Recent Progress in the Design of Advanced Cathode Materials and Battery Models for High-Performance Lithium-X (X = O2 , S, Se, Te, I2 , Br2 ) Batteries.

    Science.gov (United States)

    Xu, Jiantie; Ma, Jianmin; Fan, Qinghua; Guo, Shaojun; Dou, Shixue

    2017-07-01

    Recent advances and achievements in emerging Li-X (X = O2 , S, Se, Te, I2 , Br2 ) batteries with promising cathode materials open up new opportunities for the development of high-performance lithium-ion battery alternatives. In this review, we focus on an overview of recent important progress in the design of advanced cathode materials and battery models for developing high-performance Li-X (X = O2 , S, Se, Te, I2 , Br2 ) batteries. We start with a brief introduction to explain why Li-X batteries are important for future renewable energy devices. Then, we summarize the existing drawbacks, major progress and emerging challenges in the development of cathode materials for Li-O2 (S) batteries. In terms of the emerging Li-X (Se, Te, I2 , Br2 ) batteries, we systematically summarize their advantages/disadvantages and recent progress. Specifically, we review the electrochemical performance of Li-Se (Te) batteries using carbonate-/ether-based electrolytes, made with different electrode fabrication techniques, and of Li-I2 (Br2 ) batteries with various cell designs (e.g., dual electrolyte, all-organic electrolyte, with/without cathode-flow mode, and fuel cell/solar cell integration). Finally, the perspective on and challenges for the development of cathode materials for the promising Li-X (X = O2 , S, Se, Te, I2 , Br2 ) batteries is presented. © 2017 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

  15. Measurement of sigma(ee->Hnunu)xBR(H->tautau) at CLIC @ 1.4 TeV

    CERN Document Server

    Münnich, A.

    2013-01-01

    This detector benchmark study evaluates the statistical precision with which the H -> tautau branching ratio times cross section can be measured at CLIC running at rout(s)= 1.4 TeV. Only the hadronic decays of taus are considered.

  16. Interacting spin-1/2 tetrahedral system Cu2Te2O5X2 (X = Cl, Br)

    DEFF Research Database (Denmark)

    Jensen, Jens

    2009-01-01

    Magnetic ordering and excitations of Cu2Te2O5Cl2 are analyzed in terms of a tetramerized spin model for the tetrahedral Cu clusters of spin 1/2. The mean-field model is able to account for the main properties of the incommensurable magnetic structure observed by Zaharko et al. [Phys. Rev. B 73, 0...

  17. Synthesis, characterization, and ligand behaviour of a new ditelluroether (C10H7)Te(CH2)4Te(C10H7) and the concurrently formed ionic [(C10H7)Te(CH2)4]Br.

    Science.gov (United States)

    Poropudas, Merja J; Rautiainen, J Mikko; Oilunkaniemi, Raija; Laitinen, Risto S

    2016-11-01

    The reaction of 1-naphthyl bromide with n-butyl lithium, elemental tellurium, and 1,4-dibromobutane in THF affords both (C10H7)Te(CH2)4Te(C10H7) (1) and [(C10H7)Te(CH2)4]Br (2) in good yields. 1 is preferentially formed at low temperatures and is a rare example of a structurally characterized ditelluroether in which the tellurium atoms are bridged by a hydrocarbon chain. In the solid state, 1 shows secondary bonding TeTe interactions, which connect the molecules into layers which are further linked to 3-dimensional frameworks by TeH hydrogen bonds. [(C10H7)Te(CH2)4]Br (2) is formed concurrently during the synthesis of 1 and is the main product, when the reaction is carried out at room temperature. The revPBE/def2-TZVPP calculations of the reaction profiles indicate that the formation of 2 is somewhat more favourable than that of 1. Furthermore, at room temperature the activation energy for the formation of 2 is lower than that of 1. At low temperatures the activation energy of the reaction leading to 1 is lower than that to 2, which is consistent with the synthetic observations. When 1 was treated with CuBr, [Cu2(μ-Br)2{μ-(C10H7)Te(CH2)4Te(C10H7)}2] (3) was formed. It crystallizes as two polymorphs (3a) and (3b) in which both the packing and the conformation of the ditelluroether ligands are different. The reaction of 1 with HgCl2 produces [(C10H7)Te(CH2)4]2[HgCl4]·CH2Cl2 (4·CH2Cl2) and that of 1 with CuCl2 affords [(C10H7)Te(CH2)4]Cl (5). 2 and 5 are isomorphous.

  18. Radiochemical neutron activation analysis for 36 elements in geological material: Au, Ag, Bi, Br, Cd, Cs, Ge, In, Ir, Ni, Os, Pd, Rb, Re, Sb, Se, Sn, Te, Tl, U, and Zn as well as Sc, Y, and REE

    Energy Technology Data Exchange (ETDEWEB)

    Anders, E; Wolf, R; Morgan, J W; Ebihara, M; Woodrow, A B; Janssens, M J; Hertogen, J

    1988-01-01

    In lunar and terrestrial rocks and in meteorites, the radiochemical neutron activation method decribed here enables determination of the 21 trace and ultratrace elements Ag, Au, Bi, Br, Cd, Cs, Ga, Ge, In, Ir, Ni, Os, Pd, Rb, Re, Sb, Se, Te, Tl, U, Zn, as well as 13 rare earth elements (REE), Sc and Y. Materials, techniques and procedures are discussed. 81 refs.

  19. Sensitivity of magnetic properties to chemical pressure in lanthanide garnets Ln 3 A 2 X 3O12, Ln  =  Gd, Tb, Dy, Ho, A  =  Ga, Sc, In, Te, X  =  Ga, Al, Li

    Science.gov (United States)

    Mukherjee, P.; Sackville Hamilton, A. C.; Glass, H. F. J.; Dutton, S. E.

    2017-10-01

    A systematic study of the structural and magnetic properties of three-dimensionally frustrated lanthanide garnets Ln 3 A 2 X 3O12, Ln  =  Gd, Tb, Dy, Ho, A  =  Ga, Sc, In, Te, X  =  Ga, Al, Li is presented. Garnets with Ln  =  Gd show magnetic behaviour consistent with isotropic Gd3+ spins; no magnetic ordering is observed for T  ⩾  0.4 K. Magnetic ordering features are seen for garnets with Ln  =  Tb, Dy, Ho in the temperature range 0.4  <  T  <  2.5 K, however the nature of the magnetic ordering varies for the different Ln as well as for different combinations of A and X. The magnetic behaviour can be explained by tuning of the magnetic interactions and changes in the single-ion anisotropy. The change in magnetic entropy is evaluated from isothermal magnetisation measurements to characterise the magnetocaloric effect in these materials. Among the Gd garnets, the maximum change in magnetic entropy per mole (15.45 J K-1 molGd-1 ) is observed for Gd3Sc2Ga3O12 at 2 K, in a field of 9 T. The performance of Dy3Ga5O12 as a magnetocaloric material surpasses the other garnets with Ln  =  Tb, Dy, Ho.

  20. CdZnTe- and TlBr-detectors response simulation for registration of the mixed beta- and gamma-radiation

    Directory of Open Access Journals (Sweden)

    Skrypnyk A. I.

    2015-02-01

    Full Text Available One of the approaches for reconstructing the spectra of the mixed beta- and gamma-radiation, produced by wide band-gap semiconductor detectors, and the subsequent identification of radionuclides that are comprised in the mixture composition is a method based on various methods of spectral deconvolution. The presence of the detector response functions for each individual source of radiation is a key point in the studying such techniques. The response of TlBr- and CdZnTe-detectors to gamma-rays from 90Sr and 137Cs was simulated by Monte-Carlo method via Geant4 package. The computer experiments were conducted with using a β-filter and without it. It was shown that optimal thickness of the Al β-filter required for complete suppressing the conversion electrons in the 137Cs spectrum is 0.5 mm. The modification of 661.7 keV photopeaks with a using β-filter was investigated.

  1. LiDy(PO34

    Directory of Open Access Journals (Sweden)

    Fathia Chehimi-Moumen

    2008-07-01

    Full Text Available Single crystals of lithium dysprosium polyphosphate, LiDy(PO34, were prepared by the flux method. The atomic arrangement is built up by infinite (PO3n chains extending along the b axis. Dy3+ and Li+ cations alternate in the middle of four such chains, with Dy...Li distances of 3.54 (1 and 3.48 (1 Å. The DyO8 dodecahedra and LiO4 tetrahedra deviate significantly from the ideal geometry. Both Dy and Li occupy special positions (Wyckoff position 4e, site symmetry 2.

  2. AND Dy(III)

    African Journals Online (AJOL)

    userpc

    SYNTHESIS, SPECTROSCOPIC CHARACTERIZATION AND BIOLOGICAL. ACTIVITIES OF Sm(III) AND Dy(III) COMPLEXES WITH SCHIFF BASE DERIVED FROM. 2-HYDROXY-1-NAPHTHALDEHYDE AND 2-AMINOBENZOIC ACID. 1Bashir, S.S. and Abdulhadi, A. 1Department of Chemistry, Rabi'u Musa Kwankwaso ...

  3. Comparative investigation of the coupled-tetrahedra quantum spin systems Cu{sub 2}Te{sub 2}O{sub 5}X{sub 2}, X = Cl, Br and Cu{sub 4}Te{sub 5}O{sub 12}Cl{sub 4}

    Energy Technology Data Exchange (ETDEWEB)

    Valenti, R. [Institut fuer Theoretische Physik, Universitaet Frankfurt, Max-von-Laue-Strasse 1, 60438 Frankfurt (Germany)], E-mail: valenti@itp.uni-frankfurt.de; Saha-Dasgupta, T. [S.N. Bose National Centre for Basic Sciences, JD Block, Sector 3, Salt Lake City, Kolkata 700 098 (India); Jeschke, H.O. [Institut fuer Theoretische Physik, Universitaet Frankfurt, Max-von-Laue-Strasse 1, 60438 Frankfurt (Germany); Rahaman, B. [S.N. Bose National Centre for Basic Sciences, JD Block, Sector 3, Salt Lake City, Kolkata 700 098 (India); Rosner, H. [MPI-CPS, Noethnitzer Strasse 40, 01187 Dresden (Germany); Lemmens, P. [IPCM, TU Braunschweig, Mendelssohnstrasse 3, 38106 Braunschweig (Germany); Takagi, R.; Johnsson, M. [Department of Inorganic Chemistry, Stockholm University, S-10691 Stockholm (Sweden)

    2007-09-01

    We present a comparative study of the coupled-tetrahedra quantum spin systems Cu{sub 2}Te{sub 2}O{sub 5}X{sub 2}, X = Cl, Br (Cu-2252(X)) and the newly synthesized Cu{sub 4}Te{sub 5}O{sub 12}Cl{sub 4} (Cu-45124(Cl)) based on ab initio density functional theory calculations. The magnetic behavior of Cu-45124(Cl) with a phase transition to an ordered state at a lower critical temperature T{sub c} = 13.6 K than in Cu-2252(Cl) (T{sub c} = 18.2 K) can be well understood in terms of the modified interaction paths. We identify the relevant structural changes between the two systems and discuss the hypothetical behavior of the not yet synthesized Cu-45124(Br) with an ab initio relaxed structure using Car-Parrinello molecular dynamics.

  4. Physics potential for the measurement of sigma(H nu antinu ̄) x BR(H -->μ+μ-) at a 1.4 TeV CLIC collider

    CERN Document Server

    Milutinovic-Dumbelovic, Gordana; Grefe, Christian; Kacarevic, Goran; Lukic, Strahinja; Pandurovic, Mila; Roloff, Philipp Gerhard; Smiljanic, Ivan

    2015-01-01

    Measurements of Higgs couplings at CLIC will offer the potential for a rich precision phys- ics programme and for the search for physics beyond the Standard Model(SM). The poten- tial for measuring the SM Higgs boson decay into two muons at a 1.4 TeV CLIC collider is addressed in this paper. The study is performed using a full Geant4 detector simulation of the CLIC_ILD detector model, taking into consideration all the relevant physics and beam-induced background processes, as well as the instrumentation of the very forward region to identify high-energy electrons. In this analysis, we show that the branching ratio BR(H-->μ+μ-) times the Higgs production cross-section in W+W- fusion can be measured with 38% statistical accuracy at sqrt(s) = 1.4 TeV assuming an integrated luminosity of 1.5 ab-1 with unpolarised beams. If 80% electron beam polarisation is considered, as planned for CLIC, the statistical uncertainty of the measurement is 27%. Systematic uncertainties are negligible.

  5. Synthesis, structures, and luminescent properties of sodium rare-earth metal(III) chloride oxotellurates(IV), Na{sub 2}Ln{sub 3}Cl{sub 3}[TeO{sub 3}]{sub 4} (Ln = Sm, Eu, Gd, Tb, Dy, and Ho)

    Energy Technology Data Exchange (ETDEWEB)

    Charkin, Dmitri O.; Dorofeev, Sergey G.; Berdonosov, Peter S.; Dolgikh, Valery A. [Department of Chemistry, Lomonosov Moscow State University (Russian Federation); Zitzer, Sabine; Greiner, Stefan; Schleid, Thomas [Institut fuer Anorganische Chemie, Universitaet Stuttgart (Germany); Olenev, Andrei V. [Department of Chemistry, Lomonosov Moscow State University (Russian Federation); Sine Theta Ltd., Moscow (Russian Federation)

    2017-11-17

    Six sodium rare-earth metal(III) chloride oxotellurates(IV), Na{sub 2}Ln{sub 3}Cl{sub 3}[TeO{sub 3}]{sub 4}, isostructural to Na{sub 2}Y{sub 3}Cl{sub 3}[TeO{sub 3}]{sub 4}, were synthesized by flux techniques and characterized by single-crystal XRD. The compounds crystallize in the monoclinic space group C2/c with lattice constants a = 23.967(1), b = 5.6342(3), c = 16.952(1) Aa, β = 134.456(5) for Ln = Sm, a = 23.932(2), b = 5.6044(5), c = 17.134(1) Aa, β = 135.151(6) for Ln = Eu, a = 23.928(1), b = 5.5928(1), c = 17.1133(8) Aa, β = 135.366(3) for Ln = Gd, a = 23.907(1), b = 5.569(3), c = 16.745(1) Aa, β = 134.205(3) for Ln = Tb, a = 23.870(1), b = 5.547(3), c = 16.665(1) Aa, β = 134.102(3) for Ln = Dy, and a = 23.814(1), b = 5.526(3), c = 16.626(1) Aa, β = 134.016(3) for Ln = Ho and Z = 4. Their crystal structure can be considered as a framework built of intergrowing Ln-O and Na-(O,Cl) slabs with channel walls decorated by tellurium atoms of [TeO{sub 3}]{sup 2-} groups. The luminescent properties of the new compounds due to the Ln{sup 3+} cations are described and discussed. We also discuss the crystal chemistry of various alkali-metal rare-earth metal(III) halide oxochalcogenates(IV). (copyright 2017 WILEY-VCH Verlag GmbH and Co. KGaA, Weinheim)

  6. Cs{sub 7}Sm{sub 11}[TeO{sub 3}]{sub 12}Cl{sub 16} and Rb{sub 7}Nd{sub 11}[TeO{sub 3}]{sub 12}Br{sub 16}, the new tellurite halides of the tetragonal Rb{sub 6}LiNd{sub 11}[SeO{sub 3}]{sub 12}Cl{sub 16} structure type

    Energy Technology Data Exchange (ETDEWEB)

    Charkin, Dmitri O. [Department of Chemistry, Moscow State University, GSP-1, 119991 Moscow (Russian Federation); Black, Cameron; Downie, Lewis J. [EaStCHEM and School of Chemistry, University of St Andrews, Purdie Building, St. Andrews, Fife KY169ST (United Kingdom); Sklovsky, Dmitry E. [Department of Chemistry, Moscow State University, GSP-1, 119991 Moscow (Russian Federation); SineTheta LTD, Moscow 119991 (Russian Federation); Berdonosov, Peter S., E-mail: berdonosov@inorg.chem.msu.ru [Department of Chemistry, Moscow State University, GSP-1, 119991 Moscow (Russian Federation); Olenev, Andrei V. [Department of Chemistry, Moscow State University, GSP-1, 119991 Moscow (Russian Federation); SineTheta LTD, Moscow 119991 (Russian Federation); Zhou, Wuzong; Lightfoot, Philip [EaStCHEM and School of Chemistry, University of St Andrews, Purdie Building, St. Andrews, Fife KY169ST (United Kingdom); Dolgikh, Valery A. [Department of Chemistry, Moscow State University, GSP-1, 119991 Moscow (Russian Federation)

    2015-12-15

    Two new rare-earth – alkali – tellurium oxide halides were synthesized by a salt flux technique and characterized by single-crystal X-ray diffraction. The structures of the new compounds Cs{sub 7}Sm{sub 11}[TeO{sub 3}]{sub 12}Cl{sub 16} (I) and Rb{sub 7}Nd{sub 11}[TeO{sub 3}]{sub 12}Br{sub 16} (II) (both tetragonal, space group I4/mcm) correspond to the sequence of [MLn{sub 11}(TeO{sub 3}){sub 12}] and [M{sub 6}X{sub 16}] layers and bear very strong similarities to those of known selenite analogs. We discuss the trends in similarities and differences in compositions and structural details between the Se and Te compounds; more members of the family are predicted. - Graphical abstract: Two new rare-earth – alkali – tellurium oxide halides were predicted and synthesized. - Highlights: • Two new rare-earth – alkali – tellurium oxide halides were synthesized. • They adopt slab structure of rare earth-tellurium-oxygen and CsCl-like slabs. • The Br-based CsCl-like slabs have been observed first in this layered family.

  7. Measurement of 1/σ dσ/dy for Z/γ* → e+e- at √s= 1.96 TeV

    Energy Technology Data Exchange (ETDEWEB)

    Yan, Ming [Univ. of Maryland, College Park, MD (United States)

    2007-03-01

    The author presents the measurement of p$\\bar{p}$ → Z/γ* → e+e- + X inclusive differential cross section as a function of boson rapidity. The data, which correspond to an integrated luminosity of 0.4 fb-1, were collected with D0 detector at Tevatron p$\\bar{p}$ collider. At the Run II energy of √s = 1.96 TeV, Z bosons are produced with rapidity out to ± 3. The cross section is measured in a mass range between 71 to 111 GeV for the allowed kinematic range.

  8. Influence of Modifier Cations on the Spectroscopic Properties of Dy(3+) Doped Telluroborate Glasses for White Light Applications.

    Science.gov (United States)

    Uma, V; Marimuthu, K; Muralidharan, G

    2016-11-01

    The effect of electronegativity and ion size of the modifier cations have been analyzed through a new series of Dy(3+) doped telluroborate glasses prepared by melt quenching technique with the composition of 30TeO2 + 29.5B2O3 + 20MO + 20MF2 + 0.5Dy2O3 (where M = Ba(2+), Sr(2+), Zn(2+), Cd(2+) and Pb(2+)). The various stretching and bending vibrational modes of borate and tellurite network have been identified through FTIR spectral measurements. The conversion of BO3 units into BO4 units increases NBOs in the glass network and the same is confirmed through FTIR spectra. The nephelauxetic ratio ([Formula: see text]) and bonding parameter (δ) value reveals that the Dy-O bond in prepared glasses possesses ionic nature. JO intensity parameters (Ω2, Ω4 and Ω6) of the present glasses follow the trend Ω2 > Ω4 > Ω6 uniformly in all the prepared glasses. Radiative parameters like transition probability (A), stimulated emission cross section[Formula: see text], branching ratio (βR) values have been predicted from the absorption spectra of Dy(3+) ions using JO theory. Among the prepared glasses TBZnD glass posses a better CIE 1931 colour chromaticity coordinates (0.33, 0.39) and CCT value (5019 K). Decay profile of (4)F9/2 state of the Dy(3+) ion exhibits non-exponential nature due to the interaction between Dy(3+)-Dy(3+) ions. The nature of interaction between Dy(3+)-Dy(3+) ions has been analyzed through Inokuti-Hirayama model and the best fit of S = 6 indicates that the dipole-dipole interaction is responsible for the energy transfer between Dy(3+)-Dy(3+) ions. The glass containing Zn(2+) ions posses encouraging results such as higher Y/B intensity ratio, stimulated emission cross section and higher branching ratio ((4)F9/2 → (6)H13/2). Thus the present study identified the Zn(2+) ions as a better modifier ion to develop the Dy(3+) doped glasses for various photonic applications.

  9. DySectAPI: Scalable Prescriptive Debugging

    DEFF Research Database (Denmark)

    Jensen, Nicklas Bo; Karlsson, Sven; Quarfot Nielsen, Niklas

    We present the DySectAPI, a tool that allow users to construct probe trees for automatic, event-driven debugging at scale. The traditional, interactive debugging model, whereby users manually step through and inspect their application, does not scale well even for current supercomputers. While...... lightweight debugging models scale well, they can currently only debug a subset of bug classes. DySectAPI fills the gap between these two approaches with a novel user-guided approach. Using both experimental results and analytical modeling we show how DySectAPI scales and can run with a low overhead...

  10. Spectroscopic studies of Dy3 + ion doped tellurite glasses for solid state lasers and white LEDs

    Science.gov (United States)

    Himamaheswara Rao, V.; Syam Prasad, P.; Mohan Babu, M.; Venkateswara Rao, P.; Satyanarayana, T.; Luís F., Santos; Veeraiah, N.

    2018-01-01

    Rare earth ion Dy3 +-doped tellurite glasses were synthesised in the system of (75-x)TeO2-15Sb2O3-10WO3-xDy2O3 (TSWD glasses). XRD and FTIR characterizations were used to find the crystalline and structural properties. The intensities of the electronic transitions and the ligand environment around the Dy3 + ion were determined using the Judd-Ofelt (J-O) theory on the absorption spectra of the glasses. The measured luminescence spectra exhibit intense emissions at 574 and 484 nm along with less intense emissions around 662 and 751 nm. Various radiative properties of the 4F9/2 excited level of Dy3 + ion were calculated for the glasses. Decay profiles were measured to find the life times and quantum efficiencies. Yellow to blue intensity ratio (Y/B), CIE chromaticity coordinates and correlated color temperature (CCT) values are calculated using the emission spectra to evaluate the emitted light. The obtained results suggest the utility of the glasses for potential yellow laser and white LED's applications.

  11. Some Limitations in the Use of Plastic and Dyed Plastic Dosimeters

    DEFF Research Database (Denmark)

    Miller, Arne; Bjergbakke, Erling; McLaughlin, W. L.

    1975-01-01

    Several practical plastic and dyed plastic dosimeters were examined under irradiation conditions similar to those used for radiation processing of materials. Cellulose triacetate, polymethyl methacrylate, polyvinyl chloride, dyed polymethyl methacrylate, dyed Cellophane and dyed Nylon were given...

  12. The BR eigenvalue algorithm

    Energy Technology Data Exchange (ETDEWEB)

    Geist, G.A. [Oak Ridge National Lab., TN (United States). Computer Science and Mathematics Div.; Howell, G.W. [Florida Inst. of Tech., Melbourne, FL (United States). Dept. of Applied Mathematics; Watkins, D.S. [Washington State Univ., Pullman, WA (United States). Dept. of Pure and Applied Mathematics

    1997-11-01

    The BR algorithm, a new method for calculating the eigenvalues of an upper Hessenberg matrix, is introduced. It is a bulge-chasing algorithm like the QR algorithm, but, unlike the QR algorithm, it is well adapted to computing the eigenvalues of the narrowband, nearly tridiagonal matrices generated by the look-ahead Lanczos process. This paper describes the BR algorithm and gives numerical evidence that it works well in conjunction with the Lanczos process. On the biggest problems run so far, the BR algorithm beats the QR algorithm by a factor of 30--60 in computing time and a factor of over 100 in matrix storage space.

  13. brıs Cumhuriyeti’nden Kuzey Kıbrıs Türk Cumhuriyeti’nin İnşasına Giden Süreçte Lefkoşa’da Mekânın ve Mimarinin Siyasi Dönüşümü: 1963-1983 / The Political Transformation of the Space and Architecture in Nicosia between the Republic of Cyprus and the Turkish Republic of Northern Cyprus: 1963-1983

    Directory of Open Access Journals (Sweden)

    Huriye Gürdallı

    2017-09-01

    -1963 fiili olarak işlevsiz hale geldiği ve adanın başkenti Lefkoşa’nın 1963’te Yeşil Hat oluşturularak kuzey ve güney olarak bölünmesinden Kuzey Kıbrıs Türk Cumhuriyeti’nin ilanına kadar olan tarihsel dönemde Kuzey Lefkoşa’da siyasi gücü temsil eden mimari ve şehirleşme politikalarının planlama, tasarım ve uygulama süreçlerini incelemektedir. Kıbrıs Türk liderliği ve garantör Türkiye’nin 1963-1974 ve 1974-1983 dönemlerindeki önceliği olan göçmenlerin yeniden yerleşimi doğrultusunda yürüttükleri iskan politikalarının sonucundaki mekânsal dönüşümü sosyo-ekonomik ve siyasi boyutlarıyla değerlendiren makale, 1983’te Kuzey Kıbrıs Türk Cumhuriyeti’nin ilanına kadarki geçiş döneminde başkent Lefkoşa’nın ve Kuzey Kıbrıs’ın mekânsal dönüşümüne etki eden etmenleri arşiv çalışması ve dönemin planlama çalışmalarını yürüten mimarlarının anlattıkları üzerinden irdelemektedir. Bu bağlamda makale, Kıbrıs’ta 1963-1983 yılları arasında yaşanan siyasi ve mekânsal dönüşüm sürecinde siyasi gücün ideolojik temsilinde değişen önceliklerin, ekonomik belirleyenlerin ve işlevselliğin Lefkoşa’daki kentsel ve mimari değişim ve sürekliliklere etkisini disiplinlerarası bir yaklaşımla değerlendirmektedir.

  14. Manipulation of Dy-Mn coupling and ferrielectric phase diagram of DyMn{sub 2}O{sub 5}: The effect of Y substitution of Dy

    Energy Technology Data Exchange (ETDEWEB)

    Zhao, Z. Y.; Wang, Y. L.; Lin, L.; Liu, M. F.; Li, X.; Yan, Z. B.; Liu, J.-M. [Laboratory of Solid State Microstructures and Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093 (China)

    2015-11-07

    DyMn{sub 2}O{sub 5} is an extraordinary example in the family of multiferroic manganites and it accommodates both the 4f and 3d magnetic ions with strong Dy-Mn (4f-3d) coupling. The electric polarization origin is believed to arise not only from the Mn spin interactions but also from the Dy-Mn coupling. Starting from proposed scenario on ferrielectricity in DyMn{sub 2}O{sub 5} where the exchange-strictions associated with the Mn{sup 3+}-Mn{sup 4+}-Mn{sup 3+} blocks and Dy{sup 3+}-Mn{sup 4+}-Dy{sup 3+} blocks generate the two ferroelectric sublattices, we perform a set of characterizations on the structure, magnetism, and electric polarization of Dy{sub 1-x}Y{sub x}Mn{sub 2}O{sub 5} in order to investigate the roles of Dy-Mn coupling in manipulating the ferrielectricity. It is revealed that the non-magnetic Y substitution of Dy suppresses gradually the Dy{sup 3+} spin ordering and the Dy-Mn coupling. Consequently, the ferroelectric sublattice generated by the exchange striction associated with the Dy{sup 3+}-Mn{sup 4+}-Dy{sup 3+} blocks is destabilized, but the ferroelectric sublattice generated by the exchange striction associated with the Mn{sup 3+}-Mn{sup 4+}-Mn{sup 3+} blocks remains less perturbed, enabling the ferrielectricity-ferroelectricity transitions with the Y substitution. A phenomenological ferrielectric domain model is suggested to explain the polarization reversal induced by the Y substitution. The present work presents a possible scenario of the multiferroic mechanism in not only DyMn{sub 2}O{sub 5} but probably also other RMn{sub 2}O{sub 5} members with strong 4f-3d coupling.

  15. Microstructures and mechanical properties of Mg–Zn–Zr–Dy ...

    Indian Academy of Sciences (India)

    Microstructures and phase compositions of as-cast and extruded ZK60–Dy ( = 0–5) alloys were analysed by optical microscope, scanning electron microscope, X-ray diffraction and differential scanning calorimetry. Meanwhile, the tensile mechanical property was tested.With increasing Dy content, Mg–Zn–Dy new phase ...

  16. Exploring the biocatalytic potential of a DyP-type peroxidase by profiling the substrate acceptance of Thermobifida fusca DyP peroxidase

    NARCIS (Netherlands)

    Loncar, Nikola; Colpa, Dana I.; Fraaije, Marco W.

    2016-01-01

    Dye-decolorizing peroxidases (DyPs) represent a new class of oxidative enzymes for which the natural substrates are largely unknown. To explore the biocatalytic potential of a DyP, we have studied the substrate acceptance profile of a robust DyP peroxidase, a DyP from Thermobifida fusca (TfuDyP).

  17. Non-Rotational States of 164Dy

    Science.gov (United States)

    Běrziņš, J.; Bondarenko, V.; Krasta, T.; Hoyler, F.; Föhl, K.; Börner, H. G.; Krusche, B.; Robinson, S. J.; Schillenbeck, P.

    2003-06-01

    The level scheme of 164Dy up to about 2.6 MeV energy is analyzed, using experimental data obtained in (n, γ), (n, e-) and (n, nγγ) reaction measurements at the high-flux reactor ILL Grenoble, as well as the (n, n'γ) reaction data, measured at the IRT reactor in Salaspils. The structure of low-lying levels of 164Dy is interpreted in terms of two-quasiparticle states, interacting with collective excitations of axially-deformed core.

  18. Analysis of the Dy contribution to the Faraday rotation of Bi-DyIG film

    Science.gov (United States)

    Guillot, M.; Le Gall, H.; Desvignes, J. M.; Artinian, M.

    1997-04-01

    At λ=633 nm, very accurate measurements of the Faraday rotation (FR) on epitaxial garnet films of the composition {R3-xBix}[Fe2](Fe3)O12 with R=Dy, Y, and high Bi content (x≅1.30) are reported, in the temperature range of 10-620 K under magnetic field up to 20 kOe applied along the (111) and the (110) directions. The films which were prepared by standard liquid-phase epitaxy techniques under constant growth conditions present a high crystalline quality. BiDyIG films exhibit a very different temperature and field variation of FR below 140 K whereas BiYIG films data indicate no FR anisotropy. The origin of the FR anisotropy observed when R=Dy is discussed and it is shown that the anisotropy of the magnetization cannot account for the whole FR anisotropy.

  19. Growth of DySi sub 2 layers on Si surface by high-current Dy-ion implantation

    CERN Document Server

    Cheng, X Q

    2003-01-01

    We report, in this paper, the synthesis of DySi sub 2 layers on Si surfaces by high-current Dy-ion implantation in Si wafers using a metal vapor vacuum arc ion source. It was found that the continuous DySi sub 2 layers could grow at a relatively low formation temperature of 190degC and that the surface morphology varied with the variation of the implantation parameters. The formation mechanism of the equilibrium DySi sub 2 phase as well as the continuous DySi sub 2 layer on Si surface is proposed in terms of ion beam heating and the effect of ion dose on the Dy-ion implantation process. (author)

  20. Defective muscle basement membrane and lack of M-laminin in the dystrophic dy/dy mouse

    DEFF Research Database (Denmark)

    Xu, H; Christmas, P; Wu, X R

    1994-01-01

    -linked Duchenne and Becker muscular dystrophies. We have examined M-laminin expression in mice with autosomal recessive muscular dystrophy caused by the mutation dy. The heavy chain of M-laminin was undetectable in skeletal muscle, heart muscle, and peripheral nerve by immunofluorescence and immunoblotting......M-laminin is a major member of the laminin family of basement membrane proteins. It is prominently expressed in striated muscle and peripheral nerve. M-laminin is deficient in patients with the autosomal recessive Fukuyama congenital muscular dystrophy but is normal in patients with the sex...... tissue from dy/dy mice, suggesting that M-laminin heavy-chain mRNA may be produced at very low levels or is unstable. Information about the chromosomal localization of the M heavy-chain in human and mouse suggests that a mutation in the M-chain gene causes the muscular dystrophy in dy/dy mice. The dy...

  1. High-spin structure of neutron-rich Dy isotopes

    Indian Academy of Sciences (India)

    Abstract. In view of recent experimental progress on production and spectroscopy of neutron-rich isotopes of Dy with mass number A. 166 and 168, we have made theoretical investigations on the structure of high spin states of164 170Dy isotopes in the cranked Hartree–Fock–Bogoliubov (CHFB) theory employing a ...

  2. Formation of ternary Mg–Cu–Dy bulk metallic glasses

    Indian Academy of Sciences (India)

    Administrator

    Abstract. The glass-forming ability (GFA) of ternary Mg–Cu–Dy alloys was systematically investigated by using differential scanning calorimetry (DSC) and X-ray diffractometry (XRD) techniques. The results showed that a series of ternary Mg–Cu–Dy bulk metallic glasses (BGMs) with a diameter of 4–8 mm were suc-.

  3. A physicochemical research of the Dy-Sn-O system

    Science.gov (United States)

    Malinovskaya, Tatyana; Lysak, Ilya; Zhek, Valentina; Kuznetsova, Svetlana

    2017-11-01

    A physicochemical research of the processes of phase composition formation in the materials of the Dy-Sn-O system was performed. Phase composition was taking place in the course of thermal treatment of dysprosium (III) and tin (IV) codeposition products. These were codeposited from nitrate solutions at pH 7, and 25% ammonia water was used as the precipitant. Using thermal and X-ray diffraction analysis, it was found that in the above system at 90 wt. % of Dy2O3 and 10 wt. % of SnO2, when the precursors were heated above 600°C there are no solid solutions. In the meanwhile, at temperatures below 1000°C there is only one phase, Dy2O3. At temperatures above 1000°C, the system becomes bi-phase and includes Dy2O3 and Dy2Sn2O7.

  4. Pathways for the OH + Br2 → HOBr + Br and HOBr + Br → HBr + BrO Reactions.

    Science.gov (United States)

    Wang, Hongyan; Qiu, Yudong; Schaefer, Henry F

    2016-02-11

    The OH radical reaction with Br2 and the subsequent reaction HOBr + Br are of exceptional importance to atmospheric chemistry and environmental chemistry. The entrance complex, transition state, and exit complex for both reactions have been determined using the coupled-cluster method with single, double, and perturbative triple excitations CCSD(T) with correlation consistent basis sets up to size cc-pV5Z and cc-pV5Z-PP. Coupled cluster effects with full triples (CCSDT) and full quadruples (CCSDTQ) are explicitly investigated. Scalar relativistic effects, spin-orbit coupling, and zero-point vibrational energy corrections are evaluated. The results from the all-electron basis sets are compared with those from the effective core potential (ECP) pseudopotential (PP) basis sets. The results are consistent. The OH + Br2 reaction is predicted to be exothermic 4.1 ± 0.5 kcal/mol, compared to experiment, 3.9 ± 0.2 kcal/mol. The entrance complex HO···BrBr is bound by 2.2 ± 0.2 kcal/mol. The transition state lies similarly well below the reactants OH + Br2. The exit complex HOBr···Br is bound by 2.7 ± 0.6 kcal/mol relative to separated HOBr + Br. The endothermicity of the reaction HOBr + Br → HBr + BrO is 9.6 ± 0.7 kcal/mol, compared with experiment 8.7 ± 0.3 kcal/mol. For the more important reverse (exothermic) HBr + BrO reaction, the entrance complex BrO···HBr is bound by 1.8 ± 0.6 kcal/mol. The barrier for the HBr + BrO reaction is 6.8 ± 0.9 kcal/mol. The exit complex (Br···HOBr) for the HBr + BrO reaction is bound by 1.9 ± 0.2 kcal/mol with respect to the products HOBr + Br.

  5. Magnetic properties of Dy nano-islands on graphene

    Science.gov (United States)

    Anderson, Nathaniel A.; Zhang, Qiang; Hupalo, Myron; Rosenberg, Richard A.; Freeland, John W.; Tringides, Michael C.; Vaknin, David

    2017-08-01

    We have determined the magnetic properties of epitaxially grown Dy islands on graphene/SiC(0001) that are passivated by a gold film (deposited in the ultra-high vacuum growth chamber) for ex-situ X-ray magnetic circular dichroism (XMCD). Our sum-rule analysis of the Dy M4,5 XMCD spectra at low temperatures (T = 15 K) as a function of magnetic field assuming Dy3+ (spin configuration 6H15/2) indicate that the projection of the magnetic moment along an applied magnetic field of 5 T is 3.5(3) μB . Temperature dependence of the magnetic moment (extracted from the M5 XMCD spectra) shows an onset of a change in magnetic moment at about 175 K in proximity of the transition from paramagnetic to helical magnetic structure at TH = 179 K in bulk Dy. No feature at the vicinity of the ferromagnetic transition of hcp bulk Dy at Tc = 88 K is observed. However, below ∼130 K, the inverse magnetic moment (extracted from the XMCD) is linear in temperature as commonly expected from a paramagnetic system suggesting different behavior of Dy nano-island than bulk Dy.

  6. Synthesis and photoluminescence characterization of Ce and Dy ...

    Indian Academy of Sciences (India)

    A = Na or Li), La2O3, Dy2O3/Ce2O3 and WO3 with high purity of 99·9% were used. They were taken in stoichiome- tric amounts. The Dy3+ concentrations were varied from 0·1 to 1 mol%. The starting materials were mixed thoroughly for 1 h using the agate mortar pestle. The crushed samples were placed in a silica crucible ...

  7. Studies on dyed coconut ( Cocos nucifera ) pollens for removal of ...

    African Journals Online (AJOL)

    The ability of undyed and dyed coconut pollens to remove Cu(II) and Zn(II) from single ion solutions was been studied. The experiments were carried out using coconut pollens (1.0 g) undyed coconut pollens, UDCP, and dyed coconut pollens, DCPI, DCPII and DCPIII of different particle sizes: 0.40, 0.63 and 0.80 mm, ...

  8. Comparison of the Sequence-Dependent Fluorescence of the Cyanine Dyes Cy3, Cy5, DyLight DY547 and DyLight DY647 on Single-Stranded DNA

    Science.gov (United States)

    Kretschy, Nicole; Somoza, Mark M.

    2014-01-01

    Cyanine dyes are commonly used for fluorescent labeling of DNA and RNA oligonucleotides in applications including qPCR, sequencing, fluorescence in situ hybridization, Förster resonance energy transfer, and labeling for microarray hybridization. Previous research has shown that the fluorescence efficiency of Cy3 and Cy5, covalently attached to the 5′ end of single-stranded DNA, is strongly sequence dependent. Here, we show that DY547 and DY647, two alternative cyanine dyes that are becoming widely used for nucleic acid labeling, have a similar pattern of sequence-dependence, with adjacent purines resulting in higher intensity and adjacent cytosines resulting in lower intensity. Investigated over the range of all 1024 possible DNA 5mers, the intensities of Cy3 and Cy5 drop by ∼50% and ∼65% with respect to their maxima, respectively, whereas the intensities of DY547 and DY647 fall by ∼45% and ∼40%, respectively. The reduced magnitude of change of the fluorescence intensity of the DyLight dyes, particularly of DY647 in comparison with Cy5, suggests that these dyes are less likely to introduce sequence-dependent bias into experiments based on fluorescent labeling of nucleic acids. PMID:24454899

  9. Synthesis, structure and spectroscopic properties of luminescent GdVO4:Dy3+ and DyVO4 particles

    Science.gov (United States)

    Jovanović, Dragana J.; Chiappini, Andrea; Zur, Lidia; Gavrilović, Tamara V.; Lam Tran, Thi Ngoc; Chiasera, Alessandro; Lukowiak, Anna; Smits, Krisjanis; Dramićanin, Miroslav D.; Ferrari, Maurizio

    2018-02-01

    In this work, we focused on the syntheses, structure and spectroscopic properties of GdVO4:Dy3+ and DyVO4 (nano)particles of different sizes and shapes (spherical nanoparticles of 2 nm, 4 nm, and 20 nm in size, nanorods with a few nanometers in diameter and up to 10-20 nm in length and microparticles of 1-8 μm) obtained by four synthetic methods. The size effect on the structure, Raman active modes, and photoluminescence emission intensities was analyzed by X-ray diffraction, Raman and photoluminescence spectroscopy, scanning and transmission electron microscopy, and diffuse reflection spectroscopy. All X-ray diffraction patterns clearly indicated presence of a single tetragonal zircon-type phase; absence of impurity phases indicate that the dopant Dy3+ ions were successfully and uniformly incorporated into the GdVO4 host lattice due to the equal valence and similar ionic radii. Micro-Raman measurements support the XRD measurements and showed Raman-active modes of the REVO4 systems (RE = Gd, Dy). The difference between the two hosts in the diffuse reflectance spectra was observed and it could be attributed to more effective Gd3+ ions on the charge transfer bands and different polarization (compared to bulk material) in smaller nanoparticles. Photoluminescence spectroscopy showed several bands in the visible and near-infrared regions which can be exclusively attributed to the f-f transitions of Dy3+ ions.

  10. Therapeutical radiopharmaceuticals based In vivo generator system [{sup 166} Dy] Dy/{sup 166} Ho; Radiofarmacos terapeuticos basados en un sistema de generador In vivo [{sup 166}Dy] Dy/{sup 166}Ho

    Energy Technology Data Exchange (ETDEWEB)

    Ferro F, G.; Garcia S, L.; Monroy G, F.; Tendilla, J.I. [Gerencia de Aplicaciones Nucleares en la Salud, ININ, A.P. 18-1027, 11801 Mexico D.F. (Mexico); Pedraza L, M.; Murphy, C.A. de [Departamento de Medicina Nuclear, Instituto Nacional de Pediatria, Mexico D.F. (Mexico)

    2002-07-01

    At the idea to administer to a patient a molecule containing in it structure a father radionuclide, with a half life enough large which allows to the radiolabelled molecule to take up position specifically in a white tissue and decaying In vivo to the daughter radionuclide with properties potentially therapeutic, it is known as In vivo generator system. In this work the preparation and the preliminary dosimetric valuations of radiopharmaceuticals based In vivo generator system {sup 166} Dy Dy/{sup 166} Ho for applications in radioimmunotherapy, in the treatment of the rheumatoid arthritis and in the bone marrow ablation (m.o.) for candidates patients to bone marrow transplant are presented. (Author)

  11. Losartan, a therapeutic candidate in congenital muscular dystrophy: studies in the dy(2J) /dy(2J) mouse.

    Science.gov (United States)

    Elbaz, Moran; Yanay, Nurit; Aga-Mizrachi, Shlomit; Brunschwig, Zivia; Kassis, Ibaa; Ettinger, Keren; Barak, Vivian; Nevo, Yoram

    2012-05-01

    Lamininα2-deficient congenital muscular dystrophy type 1A (MDC1A) is a cureless disease associated with severe disability and shortened lifespan. Previous studies have shown reduced fibrosis and restored skeletal muscle remodeling following treatment with losartan, an angiotensin II type I receptor blocker. We therefore evaluated the effect of losartan treatment in the dy(2J) /dy(2J) mouse model of MDC1A. Homozygous dy(2J) /dy(2J) and control mice were treated with losartan or placebo for 12 weeks from 6 weeks of age. Outcome measures included hindlimb and forelimb muscle strength by Grip Strength Meter and quantitative muscle fibrosis parameters. Losartan's effects on transforming growth factor β (TGF-β) and mitogen-activated protein kinase (MAPK) signaling pathways were evaluated with Western blotting, immunofluorescence, and cytokine measurements. Losartan treatment was associated with significant impressive improvement in muscle strength and amelioration of fibrosis. Administration of losartan inhibited TGF-β signaling pathway, resulting in decreased serum TGF-β1 level and reduced downstream phosphorylated (P) Smad2/3 proteins. Moreover, losartan activated Smad7 protein, a key negative regulator of TGF-β signaling. In addition, losartan treatment inhibited the MAPK cascade as shown by decreased expression of P-p38 MAPK, P-c-jun-N-terminal kinase, and P-extracellular signal-regulated kinases 1 and 2 in the treated mice. Losartan, a commonly prescribed US Food and Drug Administration-approved medication for hypertension, demonstrated clinical improvement and amelioration of fibrosis in the dy(2J) /dy(2J) mouse model of MDC1A via TGF-β and MAPK signaling pathways. The results of this study support pursuing a clinical trial of losartan treatment in children with MDC1A. Copyright © 2011 American Neurological Association.

  12. Diagnostics of low-pressure discharges containing InBr studied for lighting applications

    Science.gov (United States)

    Briefi, S.; Fantz, U.

    2013-10-01

    The utilization of InBr in low-pressure rare-gas plasmas for lighting applications may serve as an efficient alternative to hazardous mercury, which is used in common fluorescent lamps as a radiator. In order to perform systematic investigations of these discharges, diagnostic methods are required to gain insight into the relevant plasma parameters. This goal can be achieved by using white light absorption and optical emission spectroscopy supported by an extended corona model of the indium atom and a simulation of the relative intensity of the InBr emission. The set of diagnostic methods is exemplarily applied to measurements on an inductively coupled argon discharge at 100 W power with varying InBr content. The plasma parameters are derived and the processes determining their changes with varying InBr density are identified. Increasing the InBr density results in a decrease in Te but an increase in ne, which can be explained by considering the ionization and power balance. The relevant population processes for the rovibrational states of InBr are inelastic collisions with heavy particles with an increasing importance of electron impact excitation at a higher InBr density. The radiated power is maximal at a cold spot temperature between 210 and 220 °C as reabsorption occurs at a high InBr density.

  13. Stig Brøgger's Artists' Books

    DEFF Research Database (Denmark)

    Ørum, Tania; Hvis Kromann, Thomas

    Introduction and presentation of the many artist's books made by the Danish artist Stig Brøgger......Introduction and presentation of the many artist's books made by the Danish artist Stig Brøgger...

  14. Pennisetum glaucum (L.) R. Br.

    African Journals Online (AJOL)

    alimentation en Afrique et en Inde où environ 95% de la production sont consommés. En Côte d'Ivoire, les grains sont transformés en couscous, beignets, tôh, bouillie et autres préparations. En vue de déterminer la valeur alimentaire de ces grains et ...

  15. EST Table: DY230676 [KAIKOcDNA[Archive

    Lifescience Database Archive (English)

    Full Text Available x mori] dbj|BAA89306.1| Promoting Protein [Bombyx mori] 10/09/03 32 %/105 aa FBpp0237404|DvirGJ22987-PA 10/0...DY230676 EST01412 10/09/28 87 %/127 aa ref|NP_001036842.1| promoting protein [Bomby

  16. Wash fastness improvement of malachite green-dyed cotton fabrics ...

    Indian Academy of Sciences (India)

    Washing fastness of dyed cotton fabrics by malachite green (MG) blended with nanosols composite of SiO2–TiO2 has been significantly enhanced. The nanoparticulate inorganic sols were prepared by acidcatalyzed hydrolysis of titanium (IV) tetraisopropoxide (TTIP) and tetraethylortosilicate (TEOS) in ethanol at room ...

  17. Equilibrium and kinetics studies of metal ion adsorption on dyed ...

    African Journals Online (AJOL)

    GREGO

    2007-04-02

    diffusion control- led, even though these two different mechanisms cannot be sharply demarcated (Okieimen et al., 1987). In this study the rate of adsorption of Cu(II) and Zn(II) ions onto dyed coconut pollens was investigated at pH of.

  18. Equilibrium and kinetics studies of metal ion adsorption on dyed ...

    African Journals Online (AJOL)

    Batch equilibration studies were conducted to determine the nature of adsorption of Zn (II) and Cu (II) onto dyed coconut pollens. The nature of adsorption of metal ions was explained using the Langmuir equation. The calculated values of equilibrium parameter indicated favourable adsorption by the adsorbents. Also the ...

  19. Characteristics of the iron moment in Dy-Fe and Dy-FeCo amorphous alloys studied by X-ray magnetic circular dichroism

    Energy Technology Data Exchange (ETDEWEB)

    Fleury-Frenette, K.; Dhesi, S.S.; Laan, G. van der; Strivay, D.; Weber, G.; Delwiche, J. E-mail: jdelwiche@ulg.ac.be

    2000-10-01

    The local magnetic moment of Fe in Dy-Fe and Dy-FeCo amorphous alloys has been studied using X-ray absorption spectroscopy and X-ray magnetic circular dichroism (XMCD). The Fe orbital and spin magnetic moments have been obtained for a range of alloy compositions by applying the sum rules to the XMCD spectra. The room temperature variations of the average components of the Fe moments as a function of Dy concentration and with the substitution of Fe by Co have been determined. A sharp reversal of the total magnetic moment was found at 28{+-}1 at% Dy for both alloys.

  20. Brændeovn med autopilot

    DEFF Research Database (Denmark)

    Illerup, Jytte Boll

    2013-01-01

    Ved at sætte brændeovnen på autopilot opnår man en bedre energiudnyttelse og en markant reduktion af luftforurenende stoffer. Automatisk styring af brændeovnen giver lige så lave emissioner hos forbrugeren som på testinstitutter, viser et forskningsprojekt mellem den jyske brændeovnproducent HWAM...

  1. Boye, TE

    African Journals Online (AJOL)

    Boye, TE. Vol 1, No 4 (2012) - Articles Sociological Variables Influencing the Nigeria Premier League Abstract PDF. ISSN: 2006-5442. AJOL African Journals Online. HOW TO USE AJOL... for Researchers · for Librarians · for Authors · FAQ's · More about AJOL · AJOL's Partners · Terms and Conditions of Use · Contact AJOL ...

  2. Luminomagnetic Eu3+- and Dy3+-doped hydroxyapatite for multimodal imaging.

    Science.gov (United States)

    Tesch, Annemarie; Wenisch, Christoph; Herrmann, Karl-Heinz; Reichenbach, Jürgen R; Warncke, Paul; Fischer, Dagmar; Müller, Frank A

    2017-12-01

    Multimodal imaging has recently attracted much attention due to the advantageous combination of different imaging modalities, like photoluminescence (PL) and magnetic resonance imaging (MRI). In the present study, luminescent and magnetic hydroxyapatites (HAp) were prepared via doping with europium (Eu3+) and dysprosium (Dy3+), respectively. Co-doping of Eu3+ and Dy3+ was used to combine the desired physical properties. Both lanthanide ions were successfully incorporated in the HAp crystal lattice, where they preferentially occupied calcium(I) sites. While Eu-doped HAp (Eu:HAp) exhibits dopant concentration dependent persistent PL properties, Dy-doped HAp (Dy:HAp) shows paramagnetic behavior due to the high magnetic moment of Dy3+. Co-doped HAp (Eu:Dy:HAp) nanoparticles combine both properties in one single crystal. Remarkably, multimodal co-doped HAp features enhanced PL properties due to an energy transfer from Dy3+ sensitizer to Eu3+ activator ions. Eu:Dy:HAp exhibits strong transverse relaxation effects with a maximum transverse relaxivity of 83.3L/(mmol·s). Due to their tunable PL, magnetic properties and cytocompatibility Eu:-, Dy:- and Eu:Dy:HAp represent promising biocompatible ceramic materials for luminescence imaging that simultaneously may serve as a contrast agent for MRI in permanent implants or functional coatings. Copyright © 2017 Elsevier B.V. All rights reserved.

  3. Basidiomycete DyPs: Genomic diversity, structural-functional aspects, reaction mechanism and environmental significance.

    Science.gov (United States)

    Linde, Dolores; Ruiz-Dueñas, Francisco J; Fernández-Fueyo, Elena; Guallar, Victor; Hammel, Kenneth E; Pogni, Rebecca; Martínez, Angel T

    2015-05-15

    The first enzyme with dye-decolorizing peroxidase (DyP) activity was described in 1999 from an arthroconidial culture of the fungus Bjerkandera adusta. However, the first DyP sequence had been deposited three years before, as a peroxidase gene from a culture of an unidentified fungus of the family Polyporaceae (probably Irpex lacteus). Since the first description, fewer than ten basidiomycete DyPs have been purified and characterized, but a large number of sequences are available from genomes. DyPs share a general fold and heme location with chlorite dismutases and other DyP-type related proteins (such as Escherichia coli EfeB), forming the CDE superfamily. Taking into account the lack of an evolutionary relationship with the catalase-peroxidase superfamily, the observed heme pocket similarities must be considered as a convergent type of evolution to provide similar reactivity to the enzyme cofactor. Studies on the Auricularia auricula-judae DyP showed that high-turnover oxidation of anthraquinone type and other DyP substrates occurs via long-range electron transfer from an exposed tryptophan (Trp377, conserved in most basidiomycete DyPs), whose catalytic radical was identified in the H2O2-activated enzyme. The existence of accessory oxidation sites in DyP is suggested by the residual activity observed after site-directed mutagenesis of the above tryptophan. DyP degradation of substituted anthraquinone dyes (such as Reactive Blue 5) most probably proceeds via typical one-electron peroxidase oxidations and product breakdown without a DyP-catalyzed hydrolase reaction. Although various DyPs are able to break down phenolic lignin model dimers, and basidiomycete DyPs also present marginal activity on nonphenolic dimers, a significant contribution to lignin degradation is unlikely because of the low activity on high redox-potential substrates. Copyright © 2015 The Authors. Published by Elsevier Inc. All rights reserved.

  4. The Ras antagonist, farnesylthiosalicylic acid (FTS), decreases fibrosis and improves muscle strength in dy/dy mouse model of muscular dystrophy.

    Science.gov (United States)

    Nevo, Yoram; Aga-Mizrachi, Shlomit; Elmakayes, Edva; Yanay, Nurit; Ettinger, Keren; Elbaz, Moran; Brunschwig, Zivia; Dadush, Oshrat; Elad-Sfadia, Galit; Haklai, Roni; Kloog, Yoel; Chapman, Joab; Reif, Shimon

    2011-03-22

    The Ras superfamily of guanosine-triphosphate (GTP)-binding proteins regulates a diverse spectrum of intracellular processes involved in inflammation and fibrosis. Farnesythiosalicylic acid (FTS) is a unique and potent Ras inhibitor which decreased inflammation and fibrosis in experimentally induced liver cirrhosis and ameliorated inflammatory processes in systemic lupus erythematosus, neuritis and nephritis animal models. FTS effect on Ras expression and activity, muscle strength and fibrosis was evaluated in the dy(2J)/dy(2J) mouse model of merosin deficient congenital muscular dystrophy. The dy(2J)/dy(2J) mice had significantly increased RAS expression and activity compared with the wild type mice. FTS treatment significantly decreased RAS expression and activity. In addition, phosphorylation of ERK, a Ras downstream protein, was significantly decreased following FTS treatment in the dy(2J)/dy(2J) mice. Clinically, FTS treated mice showed significant improvement in hind limb muscle strength measured by electronic grip strength meter. Significant reduction of fibrosis was demonstrated in the treated group by quantitative Sirius Red staining and lower muscle collagen content. FTS effect was associated with significantly inhibition of both MMP-2 and MMP-9 activities. We conclude that active RAS inhibition by FTS was associated with attenuated fibrosis and improved muscle strength in the dy(2J)/dy(2J) mouse model of congenital muscular dystrophy.

  5. The Ras antagonist, farnesylthiosalicylic acid (FTS, decreases fibrosis and improves muscle strength in dy/dy mouse model of muscular dystrophy.

    Directory of Open Access Journals (Sweden)

    Yoram Nevo

    Full Text Available The Ras superfamily of guanosine-triphosphate (GTP-binding proteins regulates a diverse spectrum of intracellular processes involved in inflammation and fibrosis. Farnesythiosalicylic acid (FTS is a unique and potent Ras inhibitor which decreased inflammation and fibrosis in experimentally induced liver cirrhosis and ameliorated inflammatory processes in systemic lupus erythematosus, neuritis and nephritis animal models. FTS effect on Ras expression and activity, muscle strength and fibrosis was evaluated in the dy(2J/dy(2J mouse model of merosin deficient congenital muscular dystrophy. The dy(2J/dy(2J mice had significantly increased RAS expression and activity compared with the wild type mice. FTS treatment significantly decreased RAS expression and activity. In addition, phosphorylation of ERK, a Ras downstream protein, was significantly decreased following FTS treatment in the dy(2J/dy(2J mice. Clinically, FTS treated mice showed significant improvement in hind limb muscle strength measured by electronic grip strength meter. Significant reduction of fibrosis was demonstrated in the treated group by quantitative Sirius Red staining and lower muscle collagen content. FTS effect was associated with significantly inhibition of both MMP-2 and MMP-9 activities. We conclude that active RAS inhibition by FTS was associated with attenuated fibrosis and improved muscle strength in the dy(2J/dy(2J mouse model of congenital muscular dystrophy.

  6. Z + γ cross-section measurement, σ*BR(Z + γ), in the electron channel for p$\\bar{p}$ collisions at √s = 1.8 TeV, and limits for the ZZγ and Zγγ anomalous couplings

    Energy Technology Data Exchange (ETDEWEB)

    Roach-Bellino, Mary [Tufts Univ., Medford, MA (United States)

    1994-02-01

    The Z + γ cross-section x branching ratio in the electron channel has been measured using the inclusive Z data sample from the CDF 1988--1989 collider run, for which the total integrated luminosity was 4.05 ± 0.28 pb-1. Two Zγ candidates are observed from central photon events with ΔR/γ > 0.7 and Etγ > 5.0 GeV. From these events the σ * BR(Z + γ) is measured and compared with SM predictions: σ * BR(Z + γ)e = 6.8$+5.7\\atop{-5.7}$(stat + syst)pb σ * BR(Z + γ)SM = 4.7$+0.7\\atop{-4.7}$(stat + syst)pb. From this ZZγ cross section measurement limits on the Zγγ and couplings for three different choices of compositeness scale ΛZ are obtained. The experimental sensitivity to the h30Z,γ/h10Z,γ couplings is in the range of ΛZ ~ 450--500 GeV and for the h40Z,γ/h20Z,γ couplings ΛZ ~ 300 GeV.

  7. Ozone Depletion Potential of CH3Br

    Science.gov (United States)

    Sander, Stanley P.; Ko, Malcolm K. W.; Sze, Nien Dak; Scott, Courtney; Rodriquez, Jose M.; Weisenstein, Debra K.

    1998-01-01

    The ozone depletion potential (ODP) of methyl bromide (CH3Br) can be determined by combining the model-calculated bromine efficiency factor (BEF) for CH3Br and its atmospheric lifetime. This paper examines how changes in several key kinetic data affect BEF. The key reactions highlighted in this study include the reaction of BrO + H02, the absorption cross section of HOBr, the absorption cross section and the photolysis products of BrON02, and the heterogeneous conversion of BrON02 to HOBR and HN03 on aerosol particles. By combining the calculated BEF with the latest estimate of 0.7 year for the atmospheric lifetime of CH3Br, the likely value of ODP for CH3Br is 0.39. The model-calculated concentration of HBr (approximately 0.3 pptv) in the lower stratosphere is substantially smaller than the reported measured value of about I pptv. Recent publications suggested models can reproduce the measured value if one assumes a yield for HBr from the reaction of BrO + OH or from the reaction of BrO + H02. Although the DeAlore et al. evaluation concluded any substantial yield of HBr from BrO + HO2 is unlikely, for completeness, we calculate the effects of these assumed yields on BEF for CH3Br. Our calculations show that the effects are minimal: practically no impact for an assumed 1.3% yield of HBr from BrO + OH and 10% smaller for an assumed 0.6% yield from BrO + H02.

  8. Hyperfine Structure and Isotope Shifts in Dy II

    Directory of Open Access Journals (Sweden)

    Dylan F. Del Papa

    2017-01-01

    Full Text Available Using fast-ion-beam laser-fluorescence spectroscopy (FIBLAS, we have measured the hyperfine structure (hfs of 14 levels and an additional four transitions in Dy II and the isotope shifts (IS of 12 transitions in the wavelength range of 422–460 nm. These are the first precision measurements of this kind in Dy II. Along with hfs and IS, new undocumented transitions were discovered within 3 GHz of the targeted transitions. These atomic data are essential for astrophysical studies of chemical abundances, allowing correction for saturation and the effects of blended lines. Lanthanide abundances are important in diffusion modeling of stellar interiors, and in the mechanisms and history of nucleosynthesis in the universe. Hfs and IS also play an important role in the classification of energy levels, and provide a benchmark for theoretical atomic structure calculations.

  9. Atmospheric fate of CF sub 3 Br, CF sub 2 Br sub 2 , CF sub 2 ClBr, and CF sub 2 BrCF sub 2 Br

    Energy Technology Data Exchange (ETDEWEB)

    Burkholder, J.B.; Wilson, R.R.; Gierczak, T.; Talukdar, R.; McKeen, S.A.; Orlando, J.J.; Vaghjiani, G.L.; Ravishankara, A.R. (National Oceanic and Atmospheric Administration, Boulder, CO (USA) Univ. of Colorado, Boulder (USA))

    1991-03-20

    The temperature dependent UV absorption cross sections of the haloalkanes CF{sub 3}Br, CF{sub 2}ClBr, CF{sub 2}Br{sub 2}, and CF{sub 2}BrCF{sub 2} are reported. The UV absorption cross sections were measured over the temperature range 210 to 296 K and the wavelength range 190 to 320 nm. Upper limits of the rate coefficients for the reactions of OH with CF{sub 3}Br, CF{sub 2}Br{sub 2}, CF{sub 2}ClBr, and CF{sub 2}BrCF{sub 2}Br were also determined using both pulsed photolysis and flow tube techniques. The rate coefficients at 296 K were found to be <1.2 {times} 10{sup {minus}16}, <1.5 {times} 10{sup {minus}16}, <5.0 {times} 10{sup {minus}16}, and <1.5 {times} 10{sup {minus}16} cm{sup 3} molec{sup {minus}1} s{sup {minus}1} for CF{sub 3}Br, CF{sub 2}ClBr, CF{sub 2}BrCF{sub 2}Br, respectively. The UV absorption cross-section data and OH reaction rate coefficients of these species were combined with a one-dimensional model to yield atmospheric lifetimes of 65, 16, 3.2, and <20 years for CF{sub 3}Br, CF{sub 2}ClBr, CF{sub 2}Br{sub 2}, and CF{sub 2}BrCF{sub 2}Br, respectively.

  10. A Measurement of Z Boson Production and Rapidity Distribution in Proton-Antiproton Collisions at √s = 1.96 TeV

    Energy Technology Data Exchange (ETDEWEB)

    Robson, Aidan [Univ. of Oxford (United Kingdom). Particle Physics Dept.

    2004-12-25

    High-precision measurements are made of Z boson production in proton-antiproton collisions at √s = 1.96 TeV recorded by the Collider Detector at Fermilab, using the electron decay channel. The cross-section times branching ratio is measured to be σZ · Br(Z → e+e-) = (255.7 ± 2.4stat ± 5.2sys ± 15.2lum)pb in a dataset of 194 pb-1 collected between March 2002 and June 2003. This agrees well with theoretical predictions. The cross-section for W boson production in the electron channel has also been measured in the subset of this dataset of 72 pb-1 collected up until January 2003. Using this smaller dataset the ratio of cross-sections is determined to be R ≡ σW · Br(W → eν)/σZ · Br(Z → ee) = 10.82 ± 0.18stat ± 0.16sys. Combining these results with measurements made in the muon channel gives R = 10.92 ± 0.15stat ± 0.14sys (e + μ channels), from which the branching ratio of the W to electrons and muons, and the total width of the W, have been extracted: Br(W → lν) = 0.1089 ± 0.0022 (l = e,μ); Γ(W) = 2078.8 ± 41.4 MeV, which are in good agreement with the Standard Model values and with other measurements. The CKM quark mixing matrix element |Vcs| has been extracted: |Vcs| = 0.967 ± 0.030. The rapidity distribution dσ/dy for Z → ee has also been measured over close to the full kinematic range using 194 pb-1 of data, and is found to be in good agreement with the NNLO prediction.

  11. Characterization of Dye-decolorizing Peroxidase (DyP) from Thermomonospora curvata Reveals Unique Catalytic Properties of A-type DyPs.

    Science.gov (United States)

    Chen, Chao; Shrestha, Ruben; Jia, Kaimin; Gao, Philip F; Geisbrecht, Brian V; Bossmann, Stefan H; Shi, Jishu; Li, Ping

    2015-09-18

    Dye-decolorizing peroxidases (DyPs) comprise a new family of heme peroxidases, which has received much attention due to their potential applications in lignin degradation. A new DyP from Thermomonospora curvata (TcDyP) was identified and characterized. Unlike other A-type enzymes, TcDyP is highly active toward a wide range of substrates including model lignin compounds, in which the catalytic efficiency with ABTS (kcat(app)/Km(app) = (1.7 × 10(7)) m(-1) s(-1)) is close to that of fungal DyPs. Stopped-flow spectroscopy was employed to elucidate the transient intermediates as well as the catalytic cycle involving wild-type (wt) and mutant TcDyPs. Although residues Asp(220) and Arg(327) are found necessary for compound I formation, His(312) is proposed to play roles in compound II reduction. Transient kinetics of hydroquinone (HQ) oxidation by wt-TcDyP showed that conversion of the compound II to resting state is a rate-limiting step, which will explain the contradictory observation made with the aspartate mutants of A-type DyPs. Moreover, replacement of His(312) and Arg(327) has significant effects on the oligomerization and redox potential (E°') of the enzyme. Both mutants were found to promote the formation of dimeric state and to shift E°' to a more negative potential. Not only do these results reveal the unique catalytic property of the A-type DyPs, but they will also facilitate the development of these enzymes as lignin degraders. © 2015 by The American Society for Biochemistry and Molecular Biology, Inc.

  12. Characterization of Dye-decolorizing Peroxidase (DyP) from Thermomonospora curvata Reveals Unique Catalytic Properties of A-type DyPs*

    Science.gov (United States)

    Chen, Chao; Shrestha, Ruben; Jia, Kaimin; Gao, Philip F.; Geisbrecht, Brian V.; Bossmann, Stefan H.; Shi, Jishu; Li, Ping

    2015-01-01

    Dye-decolorizing peroxidases (DyPs) comprise a new family of heme peroxidases, which has received much attention due to their potential applications in lignin degradation. A new DyP from Thermomonospora curvata (TcDyP) was identified and characterized. Unlike other A-type enzymes, TcDyP is highly active toward a wide range of substrates including model lignin compounds, in which the catalytic efficiency with ABTS (kcatapp/Kmapp = (1.7 × 107) m−1 s−1) is close to that of fungal DyPs. Stopped-flow spectroscopy was employed to elucidate the transient intermediates as well as the catalytic cycle involving wild-type (wt) and mutant TcDyPs. Although residues Asp220 and Arg327 are found necessary for compound I formation, His312 is proposed to play roles in compound II reduction. Transient kinetics of hydroquinone (HQ) oxidation by wt-TcDyP showed that conversion of the compound II to resting state is a rate-limiting step, which will explain the contradictory observation made with the aspartate mutants of A-type DyPs. Moreover, replacement of His312 and Arg327 has significant effects on the oligomerization and redox potential (E°′) of the enzyme. Both mutants were found to promote the formation of dimeric state and to shift E°′ to a more negative potential. Not only do these results reveal the unique catalytic property of the A-type DyPs, but they will also facilitate the development of these enzymes as lignin degraders. PMID:26205819

  13. White light generation in Dy{sup 3+}-and Ce{sup 3+}/Dy{sup 3+}-doped zinc–sodium–aluminosilicate glasses

    Energy Technology Data Exchange (ETDEWEB)

    Caldiño, U., E-mail: cald@xanum.uam.mx [Departamento de Física, Universidad Autónoma Metropolitana-Iztapalapa, P.O. Box 55-534, 09340 México, D.F. (Mexico); Lira, A. [Departamento de Física , Facultad de Ciencias, Universidad Autónoma del estado de México, C.P. 50000 Toluca (Mexico); Meza-Rocha, A.N. [Departamento de Física, Universidad Autónoma Metropolitana-Iztapalapa, P.O. Box 55-534, 09340 México, D.F. (Mexico); Pasquini, E. [Istituto di Fisica Applicata Nello Carrara, C.N.R., Via Madonna del Piano 10, Sesto Fiorentino, 50019 Firenze (Italy); Dipartimento di Fisica e Astronomia, Università di Firenze, Via Sansone 1, Sesto Fiorentino, 50019 Firenze (Italy); Pelli, S. [Istituto di Fisica Applicata Nello Carrara, C.N.R., Via Madonna del Piano 10, Sesto Fiorentino, 50019 Firenze (Italy); Speghini, A. [Istituto di Fisica Applicata Nello Carrara, C.N.R., Via Madonna del Piano 10, Sesto Fiorentino, 50019 Firenze (Italy); Dipartimento di Biotecnologie, Università di Verona, and INSTM, UdR Verona, Strada Le Grazie 15, I-37314 Verona (Italy); Bettinelli, M. [Dipartimento di Biotecnologie, Università di Verona, and INSTM, UdR Verona, Strada Le Grazie 15, I-37314 Verona (Italy); Righini, G.C. [Istituto di Fisica Applicata Nello Carrara, C.N.R., Via Madonna del Piano 10, Sesto Fiorentino, 50019 Firenze (Italy); Museo Storico della Fisica e Centro Studi e Ricerche “Enrico Fermi”, Piazza del Viminale 2, 00184 Roma (Italy)

    2015-11-15

    A spectroscopic investigation of 1% Dy{sub 2}O{sub 3}-singly doped and 0.5% Ce{sub 2}O{sub 3}-1.0% Dy{sub 2}O{sub 3}-codoped zinc–sodium–aluminosilicate glasses was performed by analyzing their absorption and photoluminescence spectra, and decay times. Warm white yellow light emission, with (0.419, 0.440) CIE1931 chromaticity coordinates and 3579 K color temperature, is obtained in the Dy{sup 3+}-singly doped glass excited at 399 nm, which fits to the requirements of GaN LEDs. A quantum efficiency of 74% and a very high optical gain (38.7×10{sup −25} cm{sup 2} s) were estimated for the dysprosium {sup 4}F{sub 9/2} level luminescence, which might also make the Dy{sup 3+}-doped glass a promising gain medium for solid state yellow laser pumped by GaN LEDs. In the Ce{sup 3+}/Dy{sup 3+}-codoped glass a radiative energy transfer from Ce{sup 3+} to Dy{sup 3+} is observed upon UV excitation (310–365 nm), with a Ce{sup 3+} to Dy{sup 3+} interaction distance that could be greater than 6–12 Å. The emission color from the codoped glass can be tuned with the excitation wavelength from blue light (0.247, 0.245), upon 310 nm excitation, to cold white light (0.284, 0.300), with a 9052 K color temperature, upon 365 nm excitation. - Highlights: • Zinc–sodium–aluminosilicate (ZN) glasses are optically activated with Dy{sup 3+} (ZNDy). • ZN glasses are optically activated with Ce{sup 3+}/Dy{sup 3+} (ZNCeDy). • Dy{sup 3+} is sensitized by Ce{sup 3+} through a radiative energy transfer. • ZNDy glass can generate 3579 K warm white yellow light emission. • ZNCeDy glass can generate 9052 K cold white light emission.

  14. Spectroscopic properties of Dy3 + doped ZnO for white luminescence applications

    Science.gov (United States)

    Amira, Guesmi; Chaker, Bouzidi; Habib, Elhouichet

    2017-04-01

    Undoped and Dy3 + (0.25, 0.5, 0.8 and 1.5 at.%) doped ZnO were elaborated by solid-state reaction method. The ZnO:Dy3 + samples were characterized using X-ray diffraction (XRD), Raman spectroscopy, UV-vis diffuse reflectance spectroscopy and photoluminescence (PL). The XRD analysis confirms the wurtzite structure of ZnO. A slight shift to lower angles, of the (101) peak, is seen with Dy3 + content, indicating the substitution of these ions into the ZnO lattice. Raman study indicates the good crystallinity of all ZnO:Dy3 + samples and confirms the substitution of Zn2 + by Dy3 +. The band gap energy was found to increase then decrease with Dy content. The PL excitation spectra (PLE) of Dy3 + showed six excitation bands with hypersensitive at 346 nm (6H15/2 → 6P7/2). PL spectra show principally three emission bands relatives to 4F9/2 → 6H15/2 (476 nm), 4F9/2 → 6H13/2 (567 nm) and 4F9/2 → 6H11/2 (658 nm) transitions. The concentration dependency of PL intensity indicates a quenching for Dy3 + concentration above 0.5 at.%. The PL lifetime of 4F9/2 metastable state was measured and discussed for all Dy content in ZnO. The temperature dependency of PL intensity is investigated for ZnO:Dy (0.5%) sample and the activation energy is determined. The CIE chromaticity color coordinate shows that ZnO:Dy3 + can be useful for white luminescence applications.

  15. Cd4As2Br3

    Directory of Open Access Journals (Sweden)

    Mohammed Kars

    2014-03-01

    Full Text Available Single crystals of Cd4As2Br3 (tetracadmium biarsenide tribromide were grown by a chemical transport reaction. The structure is isotypic with the members of the cadmium and mercury pnictidohalides family with general formula M4A2X3 (M = Cd, Hg; A = P, As, Sb; X = Cl, Br, I and contains two independent As atoms on special positions with site symmetry -3 and two independent Cd atoms, of which one is on a special position with site symmetry -3. The Cd4As2Br3 structure consists of AsCd4 tetrahedra sharing vertices with isolated As2Cd6 octahedra that contain As–As dumbbells in the centre of the octahedron. The Br atoms are located in the voids of this three-dimensional arrangement and bridge the different polyhedra through Cd...Br contacts.

  16. Diffractive Z/γ* → μ+μ- boson production in proton - antiproton collisions at√s = 1.96 TeV in the D0 experiment

    Energy Technology Data Exchange (ETDEWEB)

    Mendoza Navas, Luis Miguel [Univ. of the Andes, Bogota (Columbia)

    2007-07-01

    Measurements of the inclusive diffractive Z → μ+μ- cross section with gap requirement for Mμμ > 40 GeV at √s = 1.96 TeV and fraction of Z bosons produced diffractively with gap requirement from Z inclusive production are presented. The measurements are performed using a data sample corresponding to an integrated luminosity of 820 pb-1, collected with the D0 detector at the Tevatron, between 2002 to 2005. A total of 39945 di-muons events are selected and final results of: σ$gap\\atop{Diff}$ x Br(Z/γ* → μ+μ-) = 4.09 ± 0.64(stat.) ± 0.88(syst.) ± 0.27(lumi.) pb and, R$gap\\atop{Diff}$ = 1.92 ± 0.30(stat.) ± 0.41(syst.) ± 0.12(lumi) % are obtained. In addition, dσ/dζ and dσ/dy distributions are presented and they are compared with diffractive montecarlo (POMWIG). A reasonable agreement is obtained in this comparation. Finally, comparison of fraction of Z bosons produced diffractively with gap requirement (gap fraction) as measured with D0 during Run I of the Tevatron is compared. A good agreement is found for gap fraction results.

  17. buFacile synthesis and characterization of CsPbBr3 and CsPb2Br5 ...

    Indian Academy of Sciences (India)

    65

    CsPb2Br5 powders show a white color. Based on the results of the XRD analysis, it can be seen that the Cs+/Pb2+ mole ratio has the effect on the phase of final product in this synthesis process. Generally speaking, there is a reaction occurring for the formation of CsPbBr3 by CsBr and. PbBr2: CsBr + PbBr2 → CsPbBr3. (1).

  18. Lifetimes and electromagnetic transition strengths in 155Dy

    Science.gov (United States)

    Petkov, P.; Yavahchova, M. S.; Möller, O.; Dewald, A.; Tonev, D.; Saha, B.; Fitzler, A.; Jessen, K.; Klug, T.; Heinze, S.; Jolie, J.; von Brentano, P.; Goutev, N.; Bazzacco, D.; Ur, C. A.; Farnea, E.; Axiotis, M.; Lunardi, S.; de Angelis, G.; Napoli, D. R.; Marginean, N.; Martinez, T.; Caprio, M. A.

    2013-09-01

    Recoil distance Doppler-shift and Doppler-shift attenuation lifetime measurements were carried out for levels in 155Dy through the coincident detection of γ rays. Twenty-six lifetimes, most of them for the first time, were determined using the differential decay curve method for the analysis of the data. At low and medium spins, particle-plus-triaxial-rotor calculations reveal different quadrupole deformations for the one-quasineutron bands in this transitional nucleus. At high spin, the reduced B(E2) transition probabilities confirm with a better precision the results of a previous study implying decreased collectivity with increasing spin.

  19. Phase Transitions above the Yrast Line in {sup 154}Dy

    Energy Technology Data Exchange (ETDEWEB)

    Ma, W. C. [Mississippi State University, Mississippi State, Mississippi 39762 (United States); Martin, V. [Analisis Numerico, Facultad de Informatica, Universidad Politecnica de Madrid, E-28660 Madrid, (Spain); Khoo, T. L. [Argonne National Laboratory, Argonne, Illinois 60439 (United States); Lauritsen, T. [Argonne National Laboratory, Argonne, Illinois 60439 (United States); Egido, J. L. [Departamento de Fisica Teorica C-XI, Universidad Autonoma de Madrid, E-28049 Madrid, (Spain); Ahmad, I. [Argonne National Laboratory, Argonne, Illinois 60439 (United States); Bhattacharyya, P. [Purdue University, West Lafayette, Indiana 47907 (United States); Carpenter, M. P. [Argonne National Laboratory, Argonne, Illinois 60439 (United States); Daly, P. J. [Purdue University, West Lafayette, Indiana 47907 (United States); Grabowski, Z. W. [Purdue University, West Lafayette, Indiana 47907 (United States)] (and others)

    2000-06-26

    Spectra of the E2 quasicontinuum {gamma} rays feeding different spin regions of the {sup 154}Dy yrast line have been extracted. These are compared with corresponding theoretical spectra obtained by numerical simulations based on temperature-dependent Hartree-Fock theory, with thermal shape fluctuations. In this manner, different regions of the spin-energy plane can be examined. The results support the predictions of a smeared-out phase transition at high spin above the yrast line. (c) 2000 The American Physical Society.

  20. Basidiomycete DyPs: Genomic diversity, structural-functional aspects, reaction mechanism and environmental significance

    Science.gov (United States)

    Dolores Linde; Francisco J. Ruiz-Dueñas; Elena Fernández-Fueyo; Victor Guallar; Kenneth E. Hammel; Rebecca Pogni; Angel T. Martínez

    2015-01-01

    The first enzyme with dye-decolorizing peroxidase (DyP) activity was described in 1999 from an arthroconidial culture of the fungus Bjerkandera adusta. However, the first DyP sequence had been deposited three years before, as a peroxidase gene from a culture of an unidentified fungus of the family Polyporaceae (probably Irpex lacteus...

  1. Luminescent characteristics of CaSO{sub 4}:Dy films obtained by spray pyrolysis method

    Energy Technology Data Exchange (ETDEWEB)

    Roman, J., E-mail: holand_jeos@hotmail.com [Centro de Investigacion en Ciencia Aplicada y Tecnologia Avanzada, Legaria-IPN, Av. Legaria 694, Col. Irrigacion, Mexico, D.F. 11500 (Mexico); Rivera, T.; Lozano, I.B. [Centro de Investigacion en Ciencia Aplicada y Tecnologia Avanzada, Legaria-IPN, Av. Legaria 694, Col. Irrigacion, Mexico, D.F. 11500 (Mexico); Sosa, R. [Universidad Autonoma Metropolitana-Iztapalapa, Av. San Rafael Atlixco186, Col. Vicentina, Mexico, D.F., 09340 (Mexico); Alarcon, G. [Centro de Investigacion en Ciencia Aplicada y Tecnologia Avanzada, Legaria-IPN, Av. Legaria 694, Col. Irrigacion, Mexico, D.F. 11500 (Mexico)

    2012-07-15

    The present paper reports the experimental results of dysprosium doped calcium sulphate (CaSO{sub 4}:Dy) films deposited by spray pyrolysis method. CaSO{sub 4}:Dy films were deposited on three different surfaces: glass, aluminum and quartz substrates at temperatures in the range from 450 to 600 Degree-Sign C. Structural and morphological characteristics of CaSO{sub 4}:Dy films were observed. Thermoluminescent characteristics of films were determined by irradiating ultraviolet energy region. Thermoluminescent glow curve of CaSO{sub 4}:Dy films with glass and aluminum substrates showed a peak under environmental irradiation. Both TL response glow shape and intensity of CaSO{sub 4}:Dy films UV irradiated as a function of substrates were studied. - Highlights: Black-Right-Pointing-Pointer We carried out the preparation of calcium sulfate films doped with dysprosium (CaSO{sub 4}:Dy) by spray paralysis method. Black-Right-Pointing-Pointer SEM and EDS techniques were applied to study the surface topography and chemical composition of the CaSO{sub 4}:Dy films. Black-Right-Pointing-Pointer Thermoluminescent characteristics of films were determined by irradiating ultraviolet energy region. Black-Right-Pointing-Pointer The thermoluminescent response of CaSO{sub 4}:Dy films as a function of substrate was analyzed.

  2. Measurement of the ratio of branching fractions BR( B 0→K*γ BR( B s 0→ϕγ ${{BR({B^0} o K*gamma } over {BR(B_s^0 o phi gamma }}$

    Directory of Open Access Journals (Sweden)

    Daria Savrina

    2012-06-01

    Full Text Available The interest to the rare radiative decays of the B-mesons at LHCb is mostly aroused due to the measurement of the photon polarization in the Bs0 → ϕγ decay, which may provide a sensitive probe for the Standard Model. The LHCb experiment has started to take data at the energy of √s = 7 TeV in 2010 and the current paper presents the result of the studies of the two rare radiative decays B0 → K*γ and Bs0 → ϕγ with 340 pb−1 of data taken in the first half of 2011. With this data we have a preliminary measurement of BR(B0→K*γBR(Bs0→ϕγ ${{BRleft({{B^0} o K*gamma} ight} over {BRleft({B_s^0 o phi gamma} ight}}$ = 1.52±0.14(stat.±0.10(syst.±0.12(fs/fd and assuming the measured value of B $mathcal{B}$ (B0 → K*γ = (4.33 ± 0.15 × 10.5 we infer B $mathcal{B}$ (Bs0 → ϕγ = (2.8 ± 0.5 × 10−5 [1

  3. Coercivity enhancement in hot deformed Nd2Fe14B-type magnets by doping low-melting RCu alloys (R = Nd, Dy, Nd + Dy)

    Science.gov (United States)

    Lee, Y. I.; Huang, G. Y.; Shih, C. W.; Chang, W. C.; Chang, H. W.; You, J. S.

    2017-10-01

    Magnetic properties of the anisotropic NdFeB magnets prepared by hot pressing followed by die-upsetting NdFeB MQU-F powders doped with low-melting RCu alloy powders were explored, where RCu stands for Nd70Cu30, Dy70Cu30 and (Nd0.5Dy0.5)70Cu30, respectively. In addition, the post-annealing at 600 °C was employed to modify the microstructures and the magnetic properties of the hot deformed magnets. It is found that doping RCu alloy powders is effective in enhancing the coercivity of the hot deformed NdFeB magnets from 15.1 kOe to 16.3-19.5 kOe. For Nd70Cu30-doped magnets, the increment of coercivity is only 1.2 kOe. Meanwhile, Dy70Cu30-doped and (Nd0.5Dy0.5)70Cu30-doped magnets show an almost identical enhancement of coercivity of about 4.4 kOe. Importantly, the latter magnet shows a beneficial effect of reducing the usage of Dy from 1.6 wt% to 0.8 wt%. TEM analysis shows that nonmagnetic Nd, Dy and Cu appear at grain boundary and isolate the magnetic grains, leading to an enhancement of coercivity. Doping lower melting point Dy-lean (Nd0.5Dy0.5)70Cu30 powders into commercial MQU-F powders for making high coercivity hot deformed NdFeB magnets might be a potential and economic way for mass production.

  4. The surface leakage currents of CdZnTe wafers

    Energy Technology Data Exchange (ETDEWEB)

    Zha Gangqiang [School of Materials Science and Engineering, Northwestern Polytechnical University, Xi' an 710072 (China)]. E-mail: zha_gq@hotmail.com; Jie Wanqi [School of Materials Science and Engineering, Northwestern Polytechnical University, Xi' an 710072 (China); Tan Tingting [School of Materials Science and Engineering, Northwestern Polytechnical University, Xi' an 710072 (China); Li Peisen [School of Materials Science and Engineering, Northwestern Polytechnical University, Xi' an 710072 (China)

    2007-01-30

    The surface leakage currents (SLCs) and surface sheet resistances (SSRs) of CdZnTe (1 1 0) (1 1 1) A and (1 1 1) B surfaces after etching with Br-MeOH solution, chemo-mechanical polishing (CMP) and passivation were measured in the parallel stripe model, respectively. Meanwhile the surface compositions were determined by X-ray photoelectron spectroscopy (XPS). Te enrichment introduced by etching with Br-MeOH resulted in the increase of the SLCs of CdZnTe wafers. After chemo-mechanical polishing, Te enrichment was removed, and SLCs decreased. CdZnTe (1 1 1) B without Te enrichment possesses higher SLC than that of (1 1 1) A, and (1 1 0) surface has the lowest SLC, which should be attributed to the lower surface dangling bonds. Passivation treatment with NH{sub 4}F + H{sub 2}O{sub 2} is an effective method to decrease SLCs of CdZnTe, by which the SLC was decreased two orders.

  5. Effects of Dy sub lattice dilution on transport and magnetic properties in Dy1-xKxMnO3

    OpenAIRE

    K. Yadagiri; Nithya, R.; Neeraj Shukla; Satya, A. T.

    2017-01-01

    Interaction of multiple oxidation states of manganese ions with rare earth ions in manganites leads to the observation of various magnetic ground states. To understand the effect of average ionic size on electrical conductivity and magnetic ground state properties in Dy1-xKxMnO3 (x=0.0, 0.1, 0.2 & 0.3), we have investigated electron transport as a function of temperature and magnetic properties as a function of temperature, frequency and magnetic field of these compounds. Although mixed valen...

  6. Cytotoxic and genotoxic effect of the [{sup 166}Dy]Dy/{sup 166}Ho-EDTMP in vivo generator system in mice

    Energy Technology Data Exchange (ETDEWEB)

    Pedraza-Lopez, Martha [Departamento de Medicina Nuclear, Instituto Nacional de Ciencias Medicas y Nutricion, Salvador Zubiran, Delegacion Tlalpan, Mexico DF 14000 (Mexico); Ferro-Flores, Guillermina [Instituto Nacional de Investigaciones Nucleares, Carretera Mexico-Toluca, Ocoyoacac, Estado de Mexico, CP 52045 (Mexico); Arteaga de Murphy, Consuelo [Departamento de Medicina Nuclear, Instituto Nacional de Ciencias Medicas y Nutricion, Salvador Zubiran, Delegacion Tlalpan, Mexico DF 14000 (Mexico)]. E-mail: consuelo_murphy@yahoo.com.mx; Morales-Ramirez, Pedro [Instituto Nacional de Investigaciones Nucleares, Carretera Mexico-Toluca, Ocoyoacac, Estado de Mexico, CP 52045 (Mexico); Piedras-Ross, Josefa [Departamento de Medicina Nuclear, Instituto Nacional de Ciencias Medicas y Nutricion, Salvador Zubiran, Delegacion Tlalpan, Mexico DF 14000 (Mexico); Murphy-Stack, Eduardo [Hospital Santaelena, Mexico DF (Mexico); Hernandez-Oviedo, Omar [Escuela Superior de Fisica y Matematicas, IPN, Mexico DF (Mexico)

    2004-11-01

    Multiple myeloma and other hematological malignancies have been treated by myeloablative radiotherapy/chemotherapy and subsequent stem cell transplantation. [{sup 166}Dy]Dy/{sup 166}Ho-ethylenediaminetetramethylene phosphonate (EDTMP) forms a stable in vivo generator system with selective skeletal uptake in mice; therefore, it could work as a potential and improved agent for marrow ablation. Induced bone marrow cytotoxicity and genotoxicity are determined by the reduction of reticulocytes (RET) and elevation of micronucleated reticulocyte (MN-RET) in peripheral blood and ablation by bone marrow histological studies. The aim of this study was to determine the bone marrow cytotoxic and genotoxic effect of the [{sup 166}Dy]Dy/{sup 166}Ho-EDTMP in vivo generator system in mice and to evaluate by histopathology its myeloablative potential. Enriched {sup 166}Dy{sub 2}O{sub 3} was irradiated and [{sup 166}Dy]DyCl{sub 3} was added to EDTMP in phosphate buffer (pH 8.0) in a molar ratio of 1:1.75. QC was determined by TLC. Dy-EDTMP complex was prepared the same way with nonirradiated dysprosium oxide. A group of BALB/c mice were intraperitoneally injected with the radiopharmaceutical and two groups of control animals were injected with the cold complex and with 0.9% sodium chloride, respectively. A blood sample was taken at the beginning of the experiments and every 48 h for 12 days postinjection. The animals were sacrificed, organs of interest taken out and the radioactivity determined. The femur was used for histological studies. Flow cytometry analysis was used to quantify the frequency of RET and MN-RET in the blood samples. The MCNP4B Monte Carlo computer code was used for dosimetry calculations. Radiochemical purity was 99% and the mean specific activity was 1.3 MBq/mg. The RET and MN-RET frequency were statistically different in the treatment at the end of the 12-day period demonstrating cytotoxicity and genotoxicity induced by the in vivo generator system. The

  7. Yellow laser performance of Dy$^{3+}$ in co-doped Dy,Tb:LiLuF$_4$

    CERN Document Server

    Bolognesi, Giacomo; Calonico, Davide; Costanzo, Giovanni Antonio; Levi, Filippo; Metz, Philip Werner; Kränkel, Christian; Huber, Günter; Tonelli, Mauro

    2015-01-01

    We present laser results obtained from a Dy$^{3+}$-Tb$^{3+}$ co-doped LiLuF$_{4}$ crystal, pumped by a blue emitting InGaN laser diode, aiming for the generation of a compact 578 nm source. We exploit the yellow Dy$^{3+}$ transition $^{4}$F$_{9/2}$ $\\Longrightarrow$ $^{6}$H$_{13/2}$ to generate yellow laser emission. The lifetime of the lower laser level is quenched via energy transfer to co-doped Tb$^{3+}$ ions in the fluoride crystal. We report the growth technique, spectroscopic study and room temperature continuous wave (cw) laser results in a hemispherical cavity at 574 nm and with a highly reflective output coupler at 578 nm. A yellow laser at 578 nm is very relevant for metrological applications, in particular for pumping of the forbidden $^{1}$S$_{0} \\Longrightarrow ^{3}$P$_{0}$ Ytterbium clock transition, which is recommended as a secondary representation of the second in the international system (SI) of units. This paper was published in Optics Letters and is made available as an electronic reprint ...

  8. A Measurement of the Relative Branching Ratio $BR(B^- \\to D^0 K^-) / BR(B^- \\to D^0 \\pi^-)$ in Three $D^0$ Decay Modes

    Energy Technology Data Exchange (ETDEWEB)

    Fang, Hung-Chung [Univ. of California, Berkeley, CA (United States)

    2011-01-01

    Using 1.3 fb-1 of data from p$\\bar{p}$ collisions at √s = 1.96 TeV collected with the CDF II detector at the Fermilab Tevatron, we have measured the relative branching ratio $BR(B^- \\to D^0 K^-) / BR(B^- \\to D^0 \\pi^-)$ in Three $D^0$ and its charge conjugate in the D0 flavor decay mode D$0\\atop{f}$ → K-π+ and the CP-even decay modes D0 → K-K+ and D0 → π-π+

  9. Photoluminescence and energy transfer studies of Dy(3+)-doped fluorophosphate glasses.

    Science.gov (United States)

    Praveena, R; Vijaya, R; Jayasankar, C K

    2008-08-01

    Dy(3+)-doped fluorophosphate glasses with composition (in mol%) (56-x/2)P(2)O(5)+17K(2)O+(15-x/2)BaO+8Al(2)O(3) + 4AlF(3)+ xDy(2)O(3), x=0.01, 0.05, 0.1, 1.0 and 2.0, have been prepared by melt quenching technique. The luminescence spectra and lifetimes of (4)F(9/2) level of Dy(3+) ions in these glasses have been measured using the 457.9 nm line of argon ion laser as an excitation source. The free-ion calculation and Judd-Ofelt analysis have been performed. The room temperature emission spectra corresponding to (4)F(9/2)-->(6)H(J) (J=7/2, 9/2, 11/2, 13/2 and 15/2) transitions of Dy(3+) ions were measured. The fluorescence decay from (4)F(9/2) level have been measured by monitoring the intense (4)F(9/2)-->(6)H(13/2) transition. The lifetime of the decay is obtained by taking the first e-folding times of the decay curves and is found to decrease with increase in Dy(3+) ions concentration due to concentration quenching. The decay curves are found to be perfectly single exponential for samples with low Dy(3+) ion concentration. The non-exponential decay curves observed for higher concentrations are well fitted to the Inokuti-Hirayama model for S=6, which indicates that the energy transfer between the donor and acceptor is of dipole-dipole nature. The energy transfer parameter and donor to acceptor interaction increases with Dy(3+) ions concentration due to increase of energy transfer from Dy(3+) (donor) to unexcited Dy(3+) (acceptor) ions.

  10. Measurement of σ(p$\\bar{p}$→Z) Br(Z→τ+τ-) and search for Higgs bosons decaying to τ+τ- at √s= 1.96 TeV

    Energy Technology Data Exchange (ETDEWEB)

    Galea, Cristina Florina [Radboud Univ. Nijmegen (Netherlands)

    2008-01-25

    The resonant production of tau-lepton pairs is as interesting for the study of Standard Model (SM) physics as the production of lighter leptons pairs. For new phenomena, such as Higgs boson production or in case new particles beyond the SM would arise, the detection of (resonant) pairs of tau leptons becomes much more interesting. This is due to the fact that tau leptons are much heavier than the other leptons, which increases the chance that these new phenomena would be observed first in this channel. Unfortunately their clean detection is far more difficult than that of muons or electrons. The cross section times branching ratio σ. Br for the process p$\\bar{p}$ → Z → τ+τ- was measured at √s = 1.96 GeV using 1.0 fb-1 of data collected by the D0 experiment. This measurement was performed in the channel in which one of the tau leptons decays to a muon and neutrinos, while the other decays either hadronically or to an electron and neutrinos. A set of 1511 events, of which about 20% estimated background, passed all selection criteria. The trigger and muon reconstruction efficiencies, as well as the efficiency for track reconstruction were obtained from data using the 'tag and probe' method on Z → μ+μ- events. The multijet background was estimated from the sample of events which passed all selection criteria but in which the muon and the tau candidate had the same charge. The W → μv + jets background was modeled by Monte Carlo simulations, but normalized to data. All the other backgrounds, as well as the efficiency for Z → τ+τ- events were estimated using simulated events normalized to the theoretical calculations of cross sections at next-to-leading order or next-to-next-to-leading order. The energy of the tau candidates was corrected for the estimated response of the charged pions in the calorimeter, which is of the order 50-80%. Since the charged pion response

  11. New structural form of a tetranuclear lanthanide hydroxo cluster: Dy4 analogue display slow magnetic relaxation.

    Science.gov (United States)

    Jami, Ananda Kumar; Baskar, Viswanathan; Sañudo, E Carolina

    2013-03-04

    A series of tetranuclear lanthanide (Ln = Tb, Dy, Ho) hydroxo clusters has been synthesized by reaction of LnCl3·6H2O (Ln = Tb (1), Dy (2), Ho (3)) with o-vanilin based schiff base ligand 2-(2,3 dihydroxpropyl imino methyl) 6-methoxy phenol (H3L) in methanol and in the presence of triethylamine as base. The solid state structures of all the products were established by single crystal X-ray diffraction technique. Magnetism studies reveal that Dy4 analogue exhibits slow magnetic relaxation at low temperatures.

  12. Moessbauer studies of Dy/sub 2/Fesub(17-y)Alsub(y) hydrides

    Energy Technology Data Exchange (ETDEWEB)

    Zukrowski, J.; Barnasik, A.; Krop, K.; Radwanski, R.; Pszczola, J. (Akademia Gorniczo-Hutnicza, Krakow (Poland)); Suwalski, J.; Kucharski, Z.; Lukasiak, M. (Solid State Physics Department, IBJ, Swierk, Poland)

    1983-12-01

    The X-ray and Moessbauer measurements of both /sup 57/Fe and /sup 161/Dy in Dy/sub 2/Fesub(17-y)Alsub(y) (y = 0, 1.5 and 3) compounds and their hydrides are reported. Hydrogenation slightly increases the lattice parameters. An appreciable increase of the isomer shift and the hyperfine field at /sup 57/Fe nuclei is observed after hydrogenation. The hyperfine field for both the parent compound and its hydride decreases with increasing Al content across the series. Only a small variation of the hyperfine field at /sup 161/Dy nuclei is noticeable after hydrogenation.

  13. Impact of high and zero formaldehyde crosslinkers on the performance of the dyed cotton fabric

    Directory of Open Access Journals (Sweden)

    Mohsin Muhammad

    2014-01-01

    Full Text Available Performance of the colored cotton fabrics dyed with sulphur, vat, direct and reactive dyes was investigated by using two crosslinkers. DMDHEU was used as formaldehyde based crosslinker and BTCA was assessed as a zero formaldehyde alternative. Shade change of the fabrics treated with both crosslinkers was comparable and in acceptable range apart from all sulphur dyes and two reactive dyes. However, shade change of the sulphur dyed fabrics was significantly improved when typical sodium hypophosphite based catalyst for BTCA was replaced with sodium phosphate. In addition, tensile strength and easy care performance of the crosslinker treated dyed fabric was also assessed.

  14. Electroexcitation of rotational vibrations in sup 164 Dy

    Energy Technology Data Exchange (ETDEWEB)

    Scholtz, F.G.; Nojarov, R.; Faessler, A. (Institut fur Theoretische Physik, Universitat Tubingen, Auf der Morgenstelle 14, D-7400 Tubingen 1, Federal Republic of Germany (DE))

    1989-09-25

    We calculate the {ital M}1 spectrum and the distorted-wave Born-approximation ({ital e},{ital e}{prime}) form factors of the strong {ital K}{sup {pi}}=1{sup +} states in {sup 164}Dy, using a deformed Woods-Saxon potential and the quasiparticle random-phase approximation with quadrupole, spin, and spin-quadrupole interactions. A residual rotation-vibrational coupling ensures the exclusion of the spurious state. We find strongly orbital {ital M}1 states at 3.1 MeV which fit the experimental spectrum very well and exhaust 40% of the collectivity of the 1{sup +} mode. The form factor of the lowest one of these states is also in a good agreement with the experimental form factor.

  15. Cooperative effects of noncovalent bonds to the Br atom of halogen-bonded H3N...BrZ and HCN...BrZ (Z = F, Br) complexes.

    Science.gov (United States)

    McDowell, Sean A C; Joseph, Jerelle A

    2012-08-21

    A series of complexes formed between halogen-bonded H(3)N/HCN...BrZ (Z = Br, F) dimers and H(3)N/HCN...BrZ...XY (XY = HF, ClF, BeH(2), LiF) trimers were investigated at the MP2 and B3LYP levels of theory using a 6-31++G(d,p) basis set. Optimized structures, interaction energies, and other properties of interest were obtained. The addition of XY to the H(3)N/HCN...BrZ dyad leads to enhanced intermolecular binding with respect to the isolated monomers. This enhanced binding receives contributions from the electrostatic and inductive forces between the constituent pairs, with, in some instances, substantial three-body non-additive contributions to the binding energy. It was found that the XY = LiF interaction causes the greatest distortion of the H(3)N/HCN...BrZ halogen bond from the preferred linear orientation and also provides the strongest binding energy via the nonadditive energy.

  16. Rate constant for the reaction SO + BrO yields SO2 + Br

    Science.gov (United States)

    Brunning, J.; Stief, L.

    1986-01-01

    The rate of the radical-radical reaction SO + BrO yields SO2 + Br has been determined at 298 K in a discharge flow system near 1 torr pressure with detection of SO and BrO via collision-free sampling mass spectrometry. The rate constant was determined using two different methods: measuring the decay of SO radicals in the presence of an excess of BrO and measuring the decay of BrO radicals in excess SO. The results from the two methods are in reasonable agreement and the simple mean of the two values gives the recommended rate constant at 298 K, k = (5.7 + or - 2.0) x 10 to the -11th cu cm/s. This represents the first determination of this rate constant and it is consistent with a previously derived lower limit based on SO2 formation. Comparison is made with other radical-radical reactions involving SO or BrO. The reaction SO + BrO yields SO2 + Br is of interest for models of the upper atmosphere of the earth and provides a potential coupling between atmospheric sulfur and bromine chemistry.

  17. Systematic hardness measurements on CsClxBr (and NH4ClxBr ...

    Indian Academy of Sciences (India)

    ... Lecture Workshops · Refresher Courses · Symposia. Home; Journals; Bulletin of Materials Science; Volume 25; Issue 1. Systematic hardness measurements on CsClBr(1–x) and NH4ClBr(1–x) mixed crystals. K G Subhadra E Balaiah D B Sirdeshmukh. Mechanical Properties Volume 25 Issue 1 February 2002 pp 31- ...

  18. Effects of Dy sub lattice dilution on transport and magnetic properties in Dy1-xKxMnO3

    Directory of Open Access Journals (Sweden)

    K. Yadagiri

    2017-03-01

    Full Text Available Interaction of multiple oxidation states of manganese ions with rare earth ions in manganites leads to the observation of various magnetic ground states. To understand the effect of average ionic size on electrical conductivity and magnetic ground state properties in Dy1-xKxMnO3 (x=0.0, 0.1, 0.2 & 0.3, we have investigated electron transport as a function of temperature and magnetic properties as a function of temperature, frequency and magnetic field of these compounds. Although mixed valent manganese ions can facilitate a double exchange interaction via oxygen ion leading to a ferromagnetic metallic ground state, no insulator-metal transition was detected. On the other hand, in the compounds with x=0.0 to 0.2, transport properties suggested an adiabatic small polaron hopping conduction mechanism. However, x=0.3 compound followed a variable range hopping conduction. Temperature variation of magnetization data exhibited three different types of transitions involving Mn and Dy ions. The bifurcation between zero field cooled and field cooled magnetization data was observed in all the compounds. Field-dependent magnetization of all the compounds showed hysteresis loops for temperatures less than 10 K. Although large irreversibility between zero field cooled and field cooled magnetization data was observed with a peak for x=0.3, the peak temperatures did not alter with frequency ruling out the possibility of spin glass behavior. The presence of hysteresis loops and lack of saturation magnetization implied the simultaneous presence of ferromagnetic and antiferromagnetic exchange interactions well within the antiferromagnetic ordering of Mn ions.

  19. Effects of Dy sub lattice dilution on transport and magnetic properties in Dy1-xKxMnO3

    Science.gov (United States)

    Yadagiri, K.; Nithya, R.; Shukla, Neeraj; Satya, A. T.

    2017-03-01

    Interaction of multiple oxidation states of manganese ions with rare earth ions in manganites leads to the observation of various magnetic ground states. To understand the effect of average ionic size on electrical conductivity and magnetic ground state properties in Dy1-xKxMnO3 (x=0.0, 0.1, 0.2 & 0.3), we have investigated electron transport as a function of temperature and magnetic properties as a function of temperature, frequency and magnetic field of these compounds. Although mixed valent manganese ions can facilitate a double exchange interaction via oxygen ion leading to a ferromagnetic metallic ground state, no insulator-metal transition was detected. On the other hand, in the compounds with x=0.0 to 0.2, transport properties suggested an adiabatic small polaron hopping conduction mechanism. However, x=0.3 compound followed a variable range hopping conduction. Temperature variation of magnetization data exhibited three different types of transitions involving Mn and Dy ions. The bifurcation between zero field cooled and field cooled magnetization data was observed in all the compounds. Field-dependent magnetization of all the compounds showed hysteresis loops for temperatures less than 10 K. Although large irreversibility between zero field cooled and field cooled magnetization data was observed with a peak for x=0.3, the peak temperatures did not alter with frequency ruling out the possibility of spin glass behavior. The presence of hysteresis loops and lack of saturation magnetization implied the simultaneous presence of ferromagnetic and antiferromagnetic exchange interactions well within the antiferromagnetic ordering of Mn ions.

  20. Laccase treatment of recycled blue dyed paper: Physical properties and fiber charge

    Digital Repository Service at National Institute of Oceanography (India)

    Mohandass, C.; Knutson, K.; Ragauskas, A.J.

    Recycled blue colored paper was treated with laccase under various combinations of physical and chemical parameters including enzyme concentration, temperature, oxygen, and reaction time. Laccase treatment of recycled dyed pulp increased acid group...

  1. Dyeing of white and indigo dyed cotton fabrics with Mimosa tenuiflora extract

    Directory of Open Access Journals (Sweden)

    Gökhan Erkan

    2014-04-01

    Full Text Available Mimosa tenuiflora extract has been used in food industry as an additive and in textile and leather industry as a colorant. Two types of fabrics, ready to be dyed white and indigo dyed fabrics, were dyed with M. tenuiflora extract. The fabrics were mordanted after dyeing with six different metal salts. Colorimetric evaluations of fabrics were carried out by spectrophotometer. Colour fastness to washing, rubbing and light were performed. Colour strength of fabrics was calculated from Kubelka–Munk formula. Highest vividness (C∗ values were obtained by Ni mordant. Moderate fastness values were observed. However poor wet rubbing fastness values were observed in the case of indigo dyed fabrics due to lack of good wet rubbing fastness of indigo itself.

  2. Thermoluminescent properties of CaSO{sub 4}:Dy prepared by precipitation method

    Energy Technology Data Exchange (ETDEWEB)

    Roman, J.; Rivera, T. [Centro de Investigacion en Ciencia Aplicada y Tecnologia Avanzada, IPN, Av. Legaria 694, Col. Irrigacion, 11500 Mexico D. F. (Mexico); Azorin, J. [Universidad Autonoma Metropolitana, Unidad Iztapalapa, Av. San Rafael Atlixco 186, Col. Vicentina, 09340 Mexico D. F. (Mexico)], e-mail: holand_jeos@hotmail.com

    2009-10-15

    This paper reports the synthesis and thermoluminescent (Tl) characterization of CaSO{sub 4}:Dy obtained by the precipitation method. Thermoluminescent CaSO{sub 4}:Dy powder and Teflon (PTFE) were mixed in order to obtain samples in pellets form. Samples of CaSO{sub 4}:Dy were exposed to a radiation gamma source of {sup 60}Co and {sup 90}Sr beta particles. Tl response of CaSO{sub 4}:Dy showed a glow curve with two peaks centered at around 164 and 302 C. Tl phosphor showed a good linearity in the range from 0.5 to 30 Gy. Fading of the Tl information was 5.19 % in 37 days and presented a standard deviation of 4% for reproducibility. (Author)

  3. Tailoring of magnetic properties of ultrathin epitaxial Fe films by Dy doping

    Energy Technology Data Exchange (ETDEWEB)

    Baker, A. A. [Department of Physics, Clarendon Laboratory, University of Oxford, Oxford, OX1 3PU (United Kingdom); Magnetic Spectroscopy Group, Diamond Light Source, Didcot, OX11 0DE (United Kingdom); Figueroa, A. I.; Laan, G. van der [Magnetic Spectroscopy Group, Diamond Light Source, Didcot, OX11 0DE (United Kingdom); Hesjedal, T. [Department of Physics, Clarendon Laboratory, University of Oxford, Oxford, OX1 3PU (United Kingdom)

    2015-07-15

    We report on the controlled modification of relaxation parameters and magnetic moments of epitaxial Fe thin films through Dy doping. Ferromagnetic resonance measurements show that an increase of Dy doping from 0.1% to 5% gives a tripling in Gilbert damping, and more importantly a strongly enhanced anisotropic damping that can be qualitatively understood through the slow-relaxing impurity model. X-ray magnetic circular dichroism measurements show a pronounced suppression of the orbital moment of the Fe with Dy doping, leading to an almost threefold drop in the orbital to spin moment ratio, m{sub l}/m{sub s}. Doping with Dy can therefore be used to control both dynamic and static properties of thin ferromagnetic films for improved performance in spintronics device applications, mediated through the antiferromagnetic interaction of the 4f and 3d states.

  4. Tailoring of magnetic properties of ultrathin epitaxial Fe films by Dy doping

    Directory of Open Access Journals (Sweden)

    A. A. Baker

    2015-07-01

    Full Text Available We report on the controlled modification of relaxation parameters and magnetic moments of epitaxial Fe thin films through Dy doping. Ferromagnetic resonance measurements show that an increase of Dy doping from 0.1% to 5% gives a tripling in Gilbert damping, and more importantly a strongly enhanced anisotropic damping that can be qualitatively understood through the slow-relaxing impurity model. X-ray magnetic circular dichroism measurements show a pronounced suppression of the orbital moment of the Fe with Dy doping, leading to an almost threefold drop in the orbital to spin moment ratio, ml/ms. Doping with Dy can therefore be used to control both dynamic and static properties of thin ferromagnetic films for improved performance in spintronics device applications, mediated through the antiferromagnetic interaction of the 4f and 3d states.

  5. Cationic P-S-X cages (X=Br, I).

    Science.gov (United States)

    Gonsior, Marcin; Krossing, Ingo; Matern, Eberhard

    2006-02-08

    The first condensed-phase preparation of ternary P-Ch-X cations (Ch=O-Te, X=F-I) is reported: [P5S3X2]+, [P5S2X2]+, and [P4S4X]+ (X=Br, I). [P5S3X2]+ is formed from the reaction of the Ag+/PX3 reagent with P4S3. The [P5S3X2]+ ions have a structure that is related to P4S5 by replacing P=S by P+--X and S in the four-membered ring by P(X). We provide evidence that the active ingredient of the Ag+/PX3 reagent is the (H2CCl2)Ag-X-PX2+ cation. The latter likely reacts with the HOMO of P4S3 in a concerted HOMO-LUMO addition to give the P5S3X2+ ion as the first species visible in situ in the low-temperature 31P NMR spectrum. The [P5S3X2]+ ions are metastable at -78 degrees C and disproportionate at slightly higher temperatures to give [P5S2X2]+ and [P4S4X]+, probably with the extrusion of 1/n (PX)n (X=Br, I). All six new cage compounds have been characterized by multinuclear NMR spectroscopy and, in part, by IR or Raman spectroscopy. The [P5S2X2]+ salts have a nortricyclane skeleton and were also characterized by X-ray crystallography. The structure of the [P4S4X]+ ion is related to that of P4S5 in that the exo-cage P=S bond is replaced by an isoelectronic P+--X moiety.

  6. Ninhydrin-dyed latent fingerprints as a DNA source in a murder case.

    Science.gov (United States)

    Schulz, M M; Wehner, H-D; Reichert, W; Graw, M

    2004-08-01

    In this case report, we describe the possibility of using ninhydrin-dyed fingerprints as a DNA source for STR typing. Preliminary tests prove that ninhydrin-dyed material still can be useful for STR typing. The case material consisted of seven ninhydrin-labeled latent fingerprints found at a murder crime site, which could not be typed in a classical manner. We were able to swap DNA from the ninhydrin-treated areas and successfully use it for STR typing.

  7. First-Order Parametric Model of Reflectance Spectra for Dyed Fabrics

    Science.gov (United States)

    2016-02-19

    Naval Research Laboratory Washington, DC 20375-5320 NRL/MR/5708--16-9666 First-Order Parametric Model of Reflectance Spectra for Dyed Fabrics D...LIMITATION OF ABSTRACT First-Order Parametric Model of Reflectance Spectra for Dyed Fabrics D. Aiken, S. Ramsey, T. Mayo, S.G. Lambrakos, and J. Peak Naval...Unclassified Unlimited 31 Daniel Aiken (202) 279-5293 Parametric modeling Inverse/direct analysis This report describes a first-order parametric model of

  8. Luminescence studies of Dy{sup 3+} doped bismuth zinc borate glasses

    Energy Technology Data Exchange (ETDEWEB)

    Shanmugavelu, B.; Kumar, V.V. Ravi Kanth, E-mail: ravi.phy@pondiuni.edu.in

    2014-02-15

    Glasses having composition of (100−x) (1Bi{sub 2}O{sub 3}–1ZnO–1B{sub 2}O{sub 3})-xDy{sub 2}O{sub 3} (where x=0.1, 0.3, 0.5, 1 and 2 mol%) were prepared by melt quenching method and characterized through optical absorption, emission and decay curve measurements. Optical absorption spectra have been analyzed using Judd–Ofelt theory. Asymmetric ratio, the intensity ratio of yellow to blue transitions, has been calculated from the emission spectra to understand the symmetry around the Dy{sup 3+} ions in the glass matrix. The emission spectra have been analyzed in the framework of CIE 1931 chromaticity colour coordinates in order to find out the white light emission characteristics of the glasses. The decay curve measurements exhibit single exponential behaviour up to 1 mol% of Dy{sup 3+} ions whereas non exponential behaviour is observed for 2 mol% of Dy{sup 3+} ions. The non exponential curve has been fitted to the Inokuti–Hirayama model to understand the nature of energy transfer process. -- Highlights: • Luminescence quenching occurs at high concentration of Dy{sup 3+} ion. • The interaction between Dy{sup 3+} ions is of dipole–dipole type. • CIE chromaticity coordinates fall within the white light region.

  9. The role of Br2 and BrCl in surface ozone destruction at polar sunrise.

    Science.gov (United States)

    Foster, K L; Plastridge, R A; Bottenheim, J W; Shepson, P B; Finlayson-Pitts, B J; Spicer, C W

    2001-01-19

    Bromine atoms are believed to play a central role in the depletion of surface-level ozone in the Arctic at polar sunrise. Br2, BrCl, and HOBr have been hypothesized as bromine atom precursors, and there is evidence for chlorine atom precursors as well, but these species have not been measured directly. We report here measurements of Br2, BrCl, and Cl2 made using atmospheric pressure chemical ionization-mass spectrometry at Alert, Nunavut, Canada. In addition to Br2 at mixing ratios up to approximately 25 parts per trillion, BrCl was found at levels as high as approximately 35 parts per trillion. Molecular chlorine was not observed, implying that BrCl is the dominant source of chlorine atoms during polar sunrise, consistent with recent modeling studies. Similar formation of bromine compounds and tropospheric ozone destruction may also occur at mid-latitudes but may not be as apparent owing to more efficient mixing in the boundary layer.

  10. Measurement of BR(Bu to phi K)/BR(Bu to J/psi K) at the collider detector at Fermilab

    Energy Technology Data Exchange (ETDEWEB)

    Napora, Robert A. [Johns Hopkins Univ., Baltimore, MD (United States)

    2004-01-01

    This thesis presents evidence for the decay mode B± → ΦK± in p$\\bar{p}$ collisions at √s = 1.96 TeV using (120 ± 7)pb-1 of data collected by the Collider Detector at Fermilab (CDF). This signal is then used to measure the branching ratio relative to the decay mode B± → J/ΨK±. The measurement starts from reconstructing the two decay modes: B± → ΦK±, where Φ → K+K- and B± → J/ΨK±, where J/Ψ → μ+μ-. The measurement yielded 23 ± 7 B± → ΦK± events, and 406 ± 26 B± → J/ΨK± events. The fraction of B± → J/ΨK± events where the J/Ψ subsequently decayed to two muons (as opposed to two electrons) was found to be fμμ = 0.839 ± 0.066. The relative branching ratio of the two decays is then calculated based on the equation: BR(B± → ΦK±)/BR(B± → J/ΨK±) = N ΦK/NΨK • fμμ BR(J/Ψ → μ+μ-)/BR(Φ → K+K-) ϵμμK/ϵKKK R(ϵiso). The measurement finds BR(B± → ΦK±)/BR(B± → J/ΨK±) = 0.0068 ± 0.0021(stat.) ± 0.0007(syst.). The B± → ΦK± branching ratio is then found to be BR(B± → ΦK±) = [6.9 ± 2.1(stat.) ± 0.8(syst.)] x 10-6. This value is consistent with similar measurements reported by the e+e- collider experiments BaBar[1], Belle[2], and CLEO[3].

  11. Modulating the single-molecule magnet behaviour in phenoxo-O bridged Dy2 systems via subtle structural variations

    Science.gov (United States)

    Wang, Wen-Min; Zhao, Xiao-Yu; Qiao, Hui; Bai, Li; Han, Hong-Fei; Fang, Ming; Wu, Zhi-Lei; Zou, Ji-Yong

    2017-09-01

    In search of simple approaches to rationally modulate the single-molecule magnet behaviour in polynuclear lanthanide compound, a new system containing two structurally closely related dinuclear dysprosium complexes, namely [Dy2(hfac)4L2] (1) and [Dy2(hfac)4L‧2] (2) (hfac = hexafluoroacetylacetonate, HL = 2-[4-methylaniline-imino]methyl]-8-hydroxyquinoline and HL' = 2-[(3,4-dimethylaniline)-imino]methyl]-8-hydroxyquinoline), are successfully synthesized and the structure-dependent magnetic properties are investigated. The two Dy2 compounds display only slight variations in the coordination geometries of the center Dy(III) ion but display remarkably different single-molecule magnet behaviors with the anisotropic barriers (ΔE/kB) of 9.91 K for 1 and 20.57 K for 2. The different magnetic relaxation behaviors of the two Dy2 complexes mainly originate from the different chemical environments of the central DyIII ions.

  12. Épidémiologie des brûlures de la main chez les enfants vus dans le Centre National des Brûlés et de Chirurgie Plastique de Casablanca, Maroc

    OpenAIRE

    Rafik, A.; Lahlou, M.; Diouri, M.; Bahechar, N.; Chlihi, A.

    2015-01-01

    Les brûlures de la main chez l’enfant constituent une source de séquelles invalidantes. A cet régard, la conservation et la restauration complète de la fonction de la main demeurent le but primordial de la prise en charge. Afin de répertorier les caractéristiques épidémiologiques, cliniques et évolutives des mains brûlées, nous avons réalisé une étude rétrospective étalée sur 4 ans, de janvier 2011 à janvier 2015. Cette étude a permis de colliger les cas de 313 enfants atteints de brûlure de ...

  13. Épidémiologie des brûlures de la main chez les enfants vus dans le Centre National des Brûlés et de Chirurgie Plastique de Casablanca, Maroc

    Science.gov (United States)

    Rafik, A.; Lahlou, M.; Diouri, M.; Bahechar, N.; Chlihi, A.

    2015-01-01

    Summary Les brûlures de la main chez l’enfant constituent une source de séquelles invalidantes. A cet régard, la conservation et la restauration complète de la fonction de la main demeurent le but primordial de la prise en charge. Afin de répertorier les caractéristiques épidémiologiques, cliniques et évolutives des mains brûlées, nous avons réalisé une étude rétrospective étalée sur 4 ans, de janvier 2011 à janvier 2015. Cette étude a permis de colliger les cas de 313 enfants atteints de brûlure de la main vus dans le Centre National des Brulés et de Chirurgie Plastique du CHU Ibn Rochd de Casablanca. La majorité des brûlures touche les enfants de 3 à 6 ans (70% des cas), avec une légère prédominance masculine. La principale cause des brûlures survenant à cet âge est l’ébouillantement. Les brûlures par flamme représentent 33% des cas, celles par électricité 4,5%. Les brûlures chimiques et par contact sont anecdotiques (1 cas chacune). L’accident survient le plus souvent à domicile. Soixante douze pour cent des brûlures ont guéri spontanément. Afin de diminuer l’incidence de ces accidents, une approche préventive faite de sensibilisation et d’éducation devrait faire partie du cursus scolaire. PMID:27777543

  14. Postsynthesis Transformation of Insulating Cs4PbBr6 Nanocrystals into Bright Perovskite CsPbBr3 through Physical and Chemical Extraction of CsBr

    OpenAIRE

    Palazon, Francisco; Urso, Carmine; De Trizio, Luca; Akkerman, Quinten; Marras, Sergio; Locardi, Federico; Nelli, Ilaria; Ferretti, Maurizio; Prato, Mirko; Manna, Liberato

    2017-01-01

    Perovskite-related Cs4PbBr6 nanocrystals present a “zero-dimensional” crystalline structure where adjacent [PbBr6]4– octahedra do not share any corners. We show in this work that these nanocrystals can be converted into “three-dimensional” CsPbBr3 perovskites by extraction of CsBr. This conversion drastically changes the optoelectronic properties of the nanocrystals that become highly photoluminescent. The extraction of CsBr can be achieved either by thermal annealing (physical approach) or b...

  15. Elamusturundus: riigi brändimine ja Eesti bränd / Siiri Same

    Index Scriptorium Estoniae

    Same, Siiri

    2015-01-01

    Artikli autor oma 2015. a. Tallinna Tehnikaülikoolis kaitstud doktoritööst "Conceptualization of experience marketing and country branding from a marketing management perspective" ("Elamusturunduse ja riigi brändimise kontseptualiseerimine turunduse juhtimise vaatenurgast")

  16. $^{80m}$Br/$^{80}$Br a new electron-$\\gamma$ - PAC Probe

    CERN Document Server

    Correia, J G; Araújo, J P; Marques, J G; Soares, J C; Melo, A A

    2001-01-01

    Conversion electron-$\\gamma$ PAC measurements of the 49 keV - 37 keV cascade in $^{80}$Br through the intermediate 2$^{-}$ state with T$_{1/2}$=7.4 ns were performed with a system of two magnetic lens spectrometers and two BaF$_{2}$ scintillation detectors. The parent $^{80m}$Br activity with half-life of 4.4 hrs was implanted into Ni, Zn and graphite at the ISOLDE separator at CERN. The observed interaction frequency in the nickel matrix is in good agreement with the known value of the hyperfine field for Br in Ni and the magnetic moment of the 2$^{-}$ state. From the measured quadrupole interaction in Zn and graphite the electric field gradients at Br were obtained.

  17. $^{80}$Br $^{80}$Br-a new electron-gamma PAC probe

    CERN Document Server

    Correia, J G; Araújo, J P; Marques, J G; Soares, J C; Melo, A A

    2001-01-01

    Conversion electron-gamma PAC measurements of the 49-37 keV cascade in /sup 80/Br through the intermediate 2/sup -/ state with T/sub 1/2 /=7.4 ns were performed with a system of two magnetic lens spectrometers and two BaF/sub 2/ scintillation detectors. The parent /sup 80m/Br activity with a halflife of 4.4 hrs was implanted into Ni, Zn and graphite at the ISOLDE separator at CERN. The observed interaction frequency in the nickel matrix is in good agreement with the known value of the hyperfine field for Br in Ni and the magnetic moment of the 2/sup -/ state. From the measured quadrupole interaction in Zn and graphite the electric field gradients at Br were obtained. (7 refs).

  18. {sup 80m}Br/{sup 80}Br - A New Electron-Gamma PAC Probe

    Energy Technology Data Exchange (ETDEWEB)

    Correia, J. G.; Haas, H. [CERN, EP Division (Switzerland); Araujo, J. P. [IFIMUP, Fac. Ciencias (Portugal); Marques, J. G.; Soares, J. C. [Inst. Tecnologico e Nuclear (Portugal); Melo, A. A. [CFNUL (Portugal)

    2001-11-15

    Conversion electron-gamma PAC measurements of the 49-37 keV cascade in {sup 80}Br through the intermediate 2{sup -} state with T{sub 1/2}=7.4 ns were performed with a system of two magnetic lens spectrometers and two BaF{sub 2} scintillation detectors. The parent {sup 80m}Br activity with a halflife of 4.4 hrs was implanted into Ni, Zn and graphite at the ISOLDE separator at CERN. The observed interaction frequency in the nickel matrix is in good agreement with the known value of the hyperfine field for Br in Ni and the magnetic moment of the 2{sup -} state. From the measured quadrupole interaction in Zn and graphite the electric field gradients at Br were obtained.

  19. Photo-control of the magnetic properties of Dy(III) and Ho(III) homometal coordination polymers bridged by a diarylethene ligand.

    Science.gov (United States)

    Cosquer, Goulven; Morimoto, Masakazu; Irie, Masahiro; Fetoh, Ahmed; Breedlove, Brian K; Yamashita, Masahiro

    2015-04-07

    Two-dimensional Dy(III) and Ho(III) homometal coordination polymers containing the photochromic ligand 1,2-bis(5-carboxyl-2-methyl-3-thienyl)perfluorocyclopentene (DTE) with the general formula [Ln2(DTE)3(bipyridine)2(H2O)2]n (Ln = Dy and Ho) were obtained, and the magnetic properties of their open (Dy-o and Ho-o) and closed forms (Dy-c and Ho-c) were investigated. The Dy complexes exhibited slow magnetic relaxation without an external dc field. The magnetic properties of the Dy complexes were irreversibly affected by the conformation of the ligand.

  20. Emergence of Chaotic Scattering in Ultracold Er and Dy

    Directory of Open Access Journals (Sweden)

    T. Maier

    2015-11-01

    Full Text Available We show that for ultracold magnetic lanthanide atoms chaotic scattering emerges due to a combination of anisotropic interaction potentials and Zeeman coupling under an external magnetic field. This scattering is studied in a collaborative experimental and theoretical effort for both dysprosium and erbium. We present extensive atom-loss measurements of their dense magnetic Feshbach-resonance spectra, analyze their statistical properties, and compare to predictions from a random-matrix-theory-inspired model. Furthermore, theoretical coupled-channels simulations of the anisotropic molecular Hamiltonian at zero magnetic field show that weakly bound, near threshold diatomic levels form overlapping, uncoupled chaotic series that when combined are randomly distributed. The Zeeman interaction shifts and couples these levels, leading to a Feshbach spectrum of zero-energy bound states with nearest-neighbor spacings that changes from randomly to chaotically distributed for increasing magnetic field. Finally, we show that the extreme temperature sensitivity of a small, but sizable fraction of the resonances in the Dy and Er atom-loss spectra is due to resonant nonzero partial-wave collisions. Our threshold analysis for these resonances indicates a large collision-energy dependence of the three-body recombination rate.

  1. Millimeter wave surface resistance of RBa2Cu3O(7-delta) (R=Y,Eu,Dy,Sm,Er) superconductors

    Science.gov (United States)

    Miranda, F. A.; Gordon, W. L.; Eck, T. G.; Bhasin, K. B.; Warner, J. D.; Jenkins, K. A.

    1990-01-01

    The measurements are reported of the millimeter wave surface resistance R(sub s) at 58.6 GHz of bulk samples of RBa2Cu3O(7-delta) (R = Y,Eu,Dy,Sm,Er) and of YBa2Cu3O(7-delta) superconducting films, in the temperature range from 20 to 300 K. The bulk samples were prepared by cold pressing the powders of RBa2Cu3O(7-delta) into one in. disks. The powders were prepared by several sinterings in one atmosphere of oxygen at 925 C, with grindings between sinterings, to obtain the superconducting phase. The thin films were deposited on SrTiO3 and LaGaO3 substrates by pulsed laser ablation. Each sample was measured by replacing the end wall of a gold-plated Te sub 013 circular mode copper cavity with the sample and determining the cavity quality factor . From the difference in the Q-factor of the cavity, with and without the sample, the R(sub s) of the sample was determined.

  2. Institut brésilien pour la recherche écologique : L'enseignement et l ...

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

    En faisant un retour sur son expérience au FIE 2008, la Dre Suzana Padua, présidente de l'Institut pour la recherche écologique (IPE) du Brésil a déclaré ce qui suit : « Quand on comprend plus l'interconnexion de tout ce qui vit sur la planète, on ne pas faire autrement que d'être touchée d'une certaine façon », a dit la Dre ...

  3. Bröst cancerpatienters upplevelser i mötet med sjuksköterskan : En litteraturstudie

    OpenAIRE

    Einarsson, Susann; Karlsson, Mette

    2003-01-01

    År 2000 fick 6 348 kvinnor diagnosen bröst cancer. Bröst cancer är därmed den vanligaste formen av cancer hos kvinnor. Personer som har fått diagnosen cancer upplever stora existentiella förändringar, osäkerhet och ensamhet. Syftet med denna studie var att beskriva bröst cancerpatienters upplevelser i mötet med sjuksköterskan. Studien är en litteraturstudie och författarna har använt sig av Polit & Hunglers modell. I resultatet framgick det att kvinnornas upplevelser i mötet med sjuksköte...

  4. Enhanced magnetodielectric response in Dy modified NiCr2O4

    Science.gov (United States)

    Mandal, P. R.; Singh, Ripandeep; Das, A.; Sarkar, Tarapada; Nath, T. K.

    2017-06-01

    The chemically synthesized high purity spinel NiCr2-xDyxO4 (x = 0, 0.1) samples have been characterized using magnetic and dielectric measurements in presence of high magnetic field. Crystal and magnetic structure of the samples have been determined by analyzing neutron diffraction data recorded between temperature of 6 K and 300 K. NiCr2O4 crystallizes in tetragonal phase with the space group of I41/amd whereas NiCr1.9Dy0.1O4 crystallizes in the mixed phase of cubic (space group of Fd 3 bar m) and tetragonal phases at room temperature. An additional phase of DyCrO3 with orthorhombic structure has been found in the Dy doped compound. The lattice parameter a increases and the c decreases in tetragonal structure with the substitution of Dy in Cr site. Both the samples show superlattice reflection peak indicating the presence of long range AFM ordering (transverse component) below 40 K. But the saturation magnetization slightly increases after Dy doping. An anomaly observed near Curie temperature in ε‧ (T) of NiCr2O4 and NiCr1.9Dy0.1O4 demonstrates the contribution of coupling between ferroelectricity and ferrimagnetism in the compounds. A linear correlation between the difference in dielectric constant and the field dependent squared magnetization for both the samples has been observed. The spin-spin interactions are most likely responsible for the observed magnetodielectric (MD) effect due to the magnetodielectric hysteresis in both parent and doped samples. Interestingly the MD% is found to increase with Dy doping.

  5. Luminescent properties in films of ZrO{sub 2}: Dy; Propiedades luminiscentes en peliculas de ZrO{sub 2}: Dy

    Energy Technology Data Exchange (ETDEWEB)

    Martinez, R. C.; Guzman, J.; Rivera, T.; Ceron, P.; Montes, E.; Guzman, D. [IPN, Centro de Investigacion en Ciencia Aplicada y Tecnologia Avanzada, Unidad Legaria, Av. Legaria No. 694, Col. Irrigacion, 11500 Mexico D. F. (Mexico); Garcia H, M. [UNAM, Instituto de Investigaciones en Materiales, Circuito Exterior, Ciudad Universitaria, 04510 Mexico D. F. (Mexico); Falcony, C. [IPN, Centro de Investigacion y de Estudios Avanzados, Apdo. Postal 14-740, 07000 Mexico D. F. (Mexico); Azorin, J., E-mail: rodmarolm@yahoo.com [Universidad Autonoma Metropolitana, Unidad Iztapala, Av. San Rafael Atlixco 186, 09340 Mexico D. F. (Mexico)

    2014-08-15

    In this work the luminescent characterization of zirconium oxide (ZrO{sub 2}) films impure with dysprosium (Dy{sup +3}) is reported, obtained by means of the ultrasonics spray pyrolysis technique. The films were deposited on glass substrates (Corning), in a temperatures interval of 400 to 550 grades C, using as precursor elements Zirconium oxide chloride octahydrate (ZrOCl{sub 2}·8H{sub 2}O) and Dysprosium tri-chloride (DyCl{sub 3}), dissolved in deionized water, varying the concentration of the contaminated from the 1 to 20 atomic % with relationship to the zirconium in solution. The luminescent characterization was analyzed by means of photoluminescence and thermoluminescence. The photoluminescence results showed a spectrum with three maxima which correspond to the electronic transitions {sup 4}F{sub 9/2} - {sup 6}H{sub 15/2}, {sup 4}F{sub 9/2} - {sup 6}H{sub 13/2} and {sup 4}F{sub 9/2} - {sup 6}H{sub 11/2} characteristics of the Dy{sup 3+} ion. The thermoluminescence (Tl) response when being exposed to a monochrome UV beam in 240 nm showed a wide curve that exhibits a maxim centered in 200 grades C. The Tl response of ZrO{sub 2}:Dy in function of the dose was shown lineal in the interval of 24 mJ/cm{sup 2} to 432 mJ/cm{sup 2}. A study of the repeatability and dissipation of the ZrO{sub 2}:Dy Tl response is included. Considering the shown previous results we can conclude that the ZrO{sub 2} in film form obtained by spray pyrolysis has luminescent properties in 240 nm. (Author)

  6. On the evolution of Dipodium R. Br.

    OpenAIRE

    Peter O'byrne

    2014-01-01

    Dipodium R. Br. (Orchidaceae), a genus of ca. 38 species, should be divided into an Australasian clade and a Malesian clade, based on morphological and geographic evidences. Dipodium section Dipodium and section Leopardanthus (Blume) O. Kuntze are re-defined to accommodate this change. An evolutionary scenario that explains this division is proposed. The lack of diversity of floral structure in the genus is probably caused by pollinator-specificity, while the diversity of plant form may be du...

  7. Synthesis, characterization and optical properties of NH{sub 4}Dy(PO{sub 3}){sub 4}

    Energy Technology Data Exchange (ETDEWEB)

    Chemingui, S.; Ferhi, M., E-mail: ferhi.mounir@gmail.com; Horchani-Naifer, K.; Férid, M.

    2014-09-15

    Polycrystalline powders of NH{sub 4}Dy(PO{sub 3}){sub 4} polyphosphate have been grown by the flux method. This compound was found to be isotopic with NH{sub 4}Ce(PO{sub 3}){sub 4} and RbHo(PO{sub 3}){sub 4}. It crystallizes in the monoclinic space group P2{sub 1/n} with unit cell parameters a=10.474(6) Å, b=9.011(4) Å, c=10.947(7) Å and β=106.64(3)°. The title compound has been transformed to triphosphate Dy(PO{sub 3}){sub 3} after calcination at 800 °C. Powder X-ray diffraction, infrared and Raman spectroscopies and the differential thermal analysis have been used to identify these materials. The spectroscopic properties have been investigated through absorption, excitation, emission spectra and decay curves of Dy{sup 3+} ion in both compounds at room temperature. The emission spectra show the characteristic emission bands of Dy{sup 3+} in the two compounds, before and after calcination. The integrated emission intensity ratios of the yellow to blue (I{sub Y}/I{sub B}) transitions and the chromaticity properties have been determined from emission spectra. The decay curves are found to be double-exponential. The non-exponential behavior of the decay rates was related to the resonant energy transfer as well as cross-relaxation between the donor and acceptor Dy{sup 3+} ions. The determined properties have been discussed as function of crystal structure of both compounds. They reveal that NH{sub 4}Dy(PO{sub 3}){sub 4} is promising for white light generation but Dy(PO{sub 3}){sub 3} is potential candidates in field emission display (FED) and plasma display panel (PDP) devices. - Graphical abstract: The CIE color coordinate diagrams showing the chromatic coordinates of Dy{sup 3+} luminescence in NH{sub 4}Dy(PO{sub 3}){sub 4} and Dy(PO{sub 3}){sub 3}. - Highlights: • The polycrystalline powders of NH{sub 4}Dy(PO{sub 3}){sub 4} and Dy(PO{sub 3}){sub 3} are synthesized. • The obtained powders are characterized. • The spectroscopic properties of Dy{sup 3+} ion

  8. Growth and optical properties of Dy:Y3Al5O12 crystal

    Science.gov (United States)

    Pan, Yuxin; Zhou, Shidong; Li, Dongzhen; Liu, Bin; Song, Qingsong; Liu, Jian; Liu, Peng; Ding, Yuchong; Wang, Xiaodan; Xu, Xiaodong; Xu, Jun

    2018-02-01

    High optical quality Dy:Y3Al5O12 (Dy:YAG) crystal has been grown by the Czochralski method. Absorption spectra, fluorescence spectra and fluorescence decay curve of Dy:YAG have been recorded at room temperature. The strongest emission of Dy:YAG crystal is near 583 nm, corresponding to the 4F9/2 → 6H13/2 transition. The Judd-Ofelt parameters Ω2, Ω4 and Ω6 were calculated to be 1.49 × 10-20 cm2, 0.94 × 10-20 cm2 and 3.20 × 10-20 cm2, respectively. The radiative transition rates, branching ratios and the emission cross sections were calculated. The fluorescence and radiative lifetimes are 0.40 ms and 1.02 ms, respectively, resulting in a quantum efficiency of 39.2%. The results indicate that the Dy:YAG crystal would be a promising yellow solid state laser material.

  9. [Energy transfer and mid-infrared luminescence properties of Tm3+ /Dy3+ codoped chalcohalide glasses].

    Science.gov (United States)

    Zhang, Peng-jun; Dai, Shi-xun; Cao, Ying; Peng, Bo; Xu, Tie-feng; Nie, Qiu-hua; Zhang, Xiang-hua

    2010-09-01

    A series of chalcohalide glasses based on the composition 0.9 (Ge25 Ga5 S70)-0.1CsI doped with the different Tm3+ / Dy3+ ions ratio were synthesized by melt-quenching technique. The absorption spectra, and mid-infrared fluorescence of different glass samples under 800 nm laser excitation were measured. The results prove that, Tm3+ is an efficient sensitizer, which can enhance the Dy3+ : 2.9 microm fluorescence intensity significantly. A decrease in the intensity of 1.8 microm fluorescence and lifetimes of the Tm3+ : (3)F4 level occurred with increasing the concentration of Dy3+ ions from 0 to 1 Wt% where Tm3+ concentration was fixed to 0.5 Wt%. Also a wide spectral overlap between Tm+ : 1.8 microm emission and the absorption of Dy3+ : 6 H(15/2) --> (6)H(11/2) showed that the effective energy transfer between the two rare-earth ions was mainly attributed to the resonance energy from Tm3+: (3)F4 to Dy(3)+ : (6)H(11/2) level.

  10. Luminescence studies on SrMgAl 10O 17:Eu, Dy phosphor crystals

    Science.gov (United States)

    Wanjun, Tang; Donghua, Chen; Ming, Wu

    2009-02-01

    Using urea as fuel, SrMgAl 10O 17:Eu, Dy phosphor was prepared by a combustion method. Its luminescence properties under ultraviolet (UV) excitation were investigated. Pure SrMgAl 10O 17 phase was formed by urea-nitrate solution combustion synthesis at 550 °C. The results indicated that the emission spectra of SrMgAl 10O 17:Eu, Dy has one main peak at 460 nm and one shoulder peak near 516 nm, which are ascribed to two different types of luminescent Eu 2+ centers existing in the SrMgAl 10O 17 matrix crystal. The blue luminescence emission of SrMgAl 10O 17:Eu phosphors was improved under UV excitation by codoping Dy 3+ ions. The SrMgAl 10O 17:Eu phosphors showed green afterglow ( λ=516 nm) when Dy 3+ ions were doped. Dy 3+ ions not only successfully play the role of sensitizer for energy transfer in the system, but also act as trap levels and capture the free holes in the spinel blocks.

  11. Effects of Different Mordants on Silk Fabric Dyed with Onion Outer Skin Extracts

    Directory of Open Access Journals (Sweden)

    Mohammad Gias Uddin

    2014-01-01

    Full Text Available At present, a higher demand is put towards the use of natural dyes due to increased awareness of the environmental and health hazards associated with the synthesis and use of synthetic dyes. This research was conducted using onion outer skins as a potential source of natural plant dyes. In this study, extraction of dye was carried out in aqueous boiling method. Premordanting technique was followed using different mordants, namely alum, ferrous sulphate, tin, tannic acid, tartaric acid, and their combinations on silk fabric. Fabric samples dyed without using any mordant were then compared with the dyed samples pretreated with the mordants. The range of colors developed on dyed materials was evaluated by measuring the color values with respect to K/S values and color coordinates. It was concluded that the color values were found to be influenced by the addition of mordants, and thus different fashion hues were obtained from the same amount of dye extract using different mordants. Ferrous sulphate was found as the most influential mordant. ΔEcmc values between unmordanted (Reference dyed and metallic mordanted fabric samples were found higher than those between unmordanted and nonmetallic mordanted fabric samples. The dyed samples were evaluated for color fastness to washing, light, drycleaning, rubbing, and perspiration. The color fastness properties were found to be satisfactory and improved in many cases. From the fastness results, it was obvious that these dyes can also be applied on silk fabric without using any mordant if required.

  12. Superconductivity and flux pinning in Dy added (Bi, Pb)-2212 superconductor

    Science.gov (United States)

    Biju, A.; Sarun, P. M.; Aloysius, R. P.; Syamaprasad, U.

    2006-10-01

    The changes in phase evolution, structural, superconducting and flux pinning properties of (Bi, Pb)-2212 superconductor due to the addition of the rare earth Dy have been studied. Bulk polycrystalline samples were used for the study in which Dy content was varied from x = 0.0 to 0.5 on a general stoichiometry of Bi1.7Pb0.4Sr2Ca1.1Cu2.1DyxOy. It was found that the Dy atoms enter into the structure, replacing Sr and Ca with significant changes in the lattice parameters, microstructure, hole concentration, normal state resistivity and flux pinning strength of the system. Consequently, the critical temperature (TC), critical current density (JC) and the field dependence of JC (JC-B characteristics) of the Dy added samples were found to be enhanced considerably for optimum doping levels. A maximum TC-onset of 93.4 K (for x = 0.4) and a maximum JC of 692 A cm-2 at 64 K (for x = 0.2) were observed for doped samples, as against 75.8 K and 107 A cm-2, respectively, for the pure sample. The enhancement in the superconducting properties, particularly in the JC-B characteristics, due to Dy addition seems to have great technological significance.

  13. Optical and luminescence properties of Dy3+ doped sodium silicate glass

    Science.gov (United States)

    Srisittipokakun, N.; Kaewkhao, J.

    2017-07-01

    The aim of the present work is to study the optical and luminescence properties of Dy2O3 doped Na2O-BaO-Bi2O3-SiO2 glasses. The Dy3+ ion is chosen as dopant because it emits three visible bands, blue (470-485 nm; 4F9/2→6H15/2), yellow (570-580 nm; 4F9/2→6H13/2) and red (640-655 nm; 4F9/2→6H11/2) luminescence and finds its applications in the fields of laser, white LEDs, telecommunication technology and display devices. NaBaBiSiDy glasses with the compositions of (30-x)SiO2: 10Bi2O3: 30Na2O: 30BaO: xDy2O3 where x=0.0, 0.1, 0.5, 1.0, 1.5 and 2.0 mol% were prepared by melt-quenching technique and characterized by using density, optical absorption photoluminescence (PL) and decay rate measurements as function of different concentrations. The density (ρ), molar volume (VM) and refractive index obtained were found to increase with increase in the concentration of Dy2O3 in the glass matrix. The chromaticity coordinates were calculated from emission spectra and analyzed with CIE color diagram and appear in the white light region under ultraviolet excitation.

  14. Magnetic Properties and Magnetic Phase Diagrams of Trigonal DyNi3Ga9

    Science.gov (United States)

    Ninomiya, Hiroki; Matsumoto, Yuji; Nakamura, Shota; Kono, Yohei; Kittaka, Shunichiro; Sakakibara, Toshiro; Inoue, Katsuya; Ohara, Shigeo

    2017-12-01

    We report the crystal structure, magnetic properties, and magnetic phase diagrams of single crystalline DyNi3Ga9 studied using X-ray diffraction, electrical resistivity, specific heat, and magnetization measurements. DyNi3Ga9 crystallizes in the chiral structure with space group R32. The dysprosium ions, which are responsible for the magnetism in this compound, form a two-dimensional honeycomb structure on a (0001) plane. We show that DyNi3Ga9 exhibits successive phase transitions at TN = 10 K and T'N = 9 K. The former suggests quadrupolar ordering, and the latter is attributed to the antiferromagnetic order. It is considered that DyNi3Ga9 forms the canted-antiferromagnetic structure below T'N owing to a small hysteresis loop of the low-field magnetization curve. We observe the strong easy-plane anisotropy, and the multiple-metamagnetic transitions with magnetization-plateaus under the field applied along the honeycomb plane. For Hallel [2\\bar{1}\\bar{1}0], the plateau-region arises every 1/6 for saturation magnetization. The magnetic phase diagrams of DyNi3Ga9 are determined for the fields along principal-crystal axes.

  15. Magnetic ground state of the Ising-like antiferromagnet DyScO3

    Science.gov (United States)

    Wu, L. S.; Nikitin, S. E.; Frontzek, M.; Kolesnikov, A. I.; Ehlers, G.; Lumsden, M. D.; Shaykhutdinov, K. A.; Guo, E.-J.; Savici, A. T.; Gai, Z.; Sefat, A. S.; Podlesnyak, A.

    2017-10-01

    We report on the low-temperature magnetic properties of the DyScO3 perovskite, which were characterized by means of single crystal and powder neutron scattering, and by magnetization measurements. Below TN=3.15 K, Dy3 + moments form an antiferromagnetic structure with an easy axis of magnetization lying in the a b plane. The magnetic moments are inclined at an angle of ˜±28∘ to the b axis. We show that the ground-state Kramers doublet of Dy3 + is made up of primarily |±15 /2 〉 eigenvectors and well separated by a crystal field from the first excited state at E1=24.9 meV. This leads to an extreme Ising single-ion anisotropy, M⊥/M∥˜0.05 . The transverse magnetic fluctuations, which are proportional to M⊥2/M∥2 , are suppressed, and only moment fluctuations along the local Ising direction are allowed. We also found that the Dy-Dy dipolar interactions along the crystallographic c axis are two to four times larger than in-plane interactions.

  16. Deficiency of merosin in dystrophic dy mouse homologue of congenital muscular dystrophy

    Energy Technology Data Exchange (ETDEWEB)

    Sunada, Y.; Campbell, K.P. [Univ. of Iowa, Iowa City, IA (United States); Bernier, S.M. [and others

    1994-09-01

    Merosin (laminin M chain) is the predominant laminin isoform in the basal lamina of striated muscle and peripheral nerve and is a native ligand for {alpha}-dystroglycan, a novel laminin receptor. Merosin is linked to the subsarcolemmal actin cytoskeleton via the dystrophin-glycoprotein complex (DGC), which plays an important role for maintenance of normal muscle function. We have mapped the mouse merosin gene, Lamm, to the region containing the dystrophia muscularis (dy) locus on chromosome 10. This suggested the possibility that a mutation in the merosin gene could be responsible for the dy mouse, an animal model for autosomal recessive muscular dystrophy, and prompted us to test this hypothesis. We analyzed the status of merosin expression in dy mouse by immunofluorescence and immunoblotting. In dy mouse skeletal and cardiac muscle and peripheral nerve, merosin was reduced greater than 90% as compared to control mice. However, the expression of laminin B1/B2 chains and collagen type IV was smaller to that in control mice. These findings strongly suggest that merosin deficiency may be the primary defect in the dy mouse. Furthermore, we have identified two patients afflicted with congenital muscular dystrophy with merosin deficiency, providing the basis for future studies of molecular pathogenesis and gene therapy.

  17. Development of the web-based Spanish and Catalan versions of the Euroqol 5D-Y (EQ-5D-Y) and comparison of results with the paper version

    NARCIS (Netherlands)

    N. Robles (Noemí); L. Rajmil (Luis); D. Rodriguez-Arjona (Dolors); M. Azuara (Marta); F. Codina (Francisco); H. Raat (Hein); U. Ravens-Sieberer (Ulrike); M. Herdman (Michael)

    2015-01-01

    textabstractBackground: The objectives of the study were to develop web-based Spanish and Catalan versions of the EQ-5D-Y, and to compare scores and psychometric properties with the paper version. Methods: Web-based and paper versions of EQ-5D-Y were included in a cross-sectional study in Palafolls

  18. Te-Te and Te-C bond cleavage reactions using a monovalent gallanediyl.

    Science.gov (United States)

    Ganesamoorthy, Chelladurai; Bendt, Georg; Bläser, Dieter; Wölper, Christoph; Schulz, Stephan

    2015-03-21

    LGa (L = [(2,6-i-Pr2-C6H3)NC(Me)]2CH) reacts with elemental tellurium with formation of the Te-bridged compound [LGa-μ-Te]2 1, whereas the reactions with Ph2Te2 and i-Pr2Te occurred with cleavage of the Te-Te and Te-C bond, respectively, and subsequent formation of LGa(TePh)2 2 and LGa(i-Pr)Tei-Pr 3. 1-3 were characterized by heteronuclear NMR ((1)H, (13)C, (125)Te) and IR spectroscopy and their solid state structures were determined by single crystal X-ray analyses.

  19. Genotoxic and cytotoxic damage by the therapeutic radiopharmaceutical [{sup 166}Dy]Dy/{sup 166}Ho-EDTMP as in vivo generator system; Dano genotoxico y citotoxico por el radiofarmaco terpeutico [{sup 166}Dy]Dy/{sup 166}Ho-EDTMP como sistema de generador in vivo

    Energy Technology Data Exchange (ETDEWEB)

    Pedraza L, M.; Piedras R, J. [Instituto Nacional de Ciencias Medicas y Nutricion, Salvador Zubiran. Vasco. de Quiroga 15, 14000 Mexico D.F. (Mexico); Ferro F, G.; Morales R, P. [ININ, Km. 36.5 Carretera Mexico-Toluca, Ocoyoacac, 52045 Estado de Mexico (Mexico); Murphy S, E. [Hospital Santaelena, Mexico D.F. (Mexico); Hernandez O, O. [Escuela Superior de Fisica y Matematicas, IPN, Mexico D.F. (Mexico)

    2005-07-01

    In patients with leukemias and multiple myeloma, the cure can be obtained to inclination of a bone marrow transplant (m.o.), for that which one is used a combination of external radiotherapy and chemotherapy with the consequent toxicity to healthy organs. The complex [{sup 166}Dy]Dy/{sup 166}Ho-ethylenediaminetetramethylenephosphonate ([{sup 166}Dy]Dy/{sup 166}Ho-EDTMP) it forms a generator system in vivo stable with bony selective likeness in mice therefore, this it could work as a therapeutic radiopharmaceutical for bone marrow ablation. The objective of this original work was to determine the genotoxic and cytotoxic damage produced by the [{sup 166}Dy]Dy/{sup 166}Ho-EDTMP like a generator system in vivo by means of the reticulocytes reduction (RET) and micronucleus elevation in reticulocytes (RET-MN) in peripheral blood and to evaluate its myeloablative potential for histopathologic studies. It was irradiated {sup 166}Dy{sub 2}O{sub 3} enriched and it was add in form {sup 166}DyCI{sub 3} to the EDTMP in a softening media of phosphates (pH 8), the optimal molar relationship {sup 166}Dy: EDTMP was 1.7:1 and the radiochemical purity was evaluated by ITLC. The Dy:EDTMP complexes, non radioactive, its were prepared in the same way with non irradiated dysprosium oxide. A group of BALB/c mice was injected intraperitoneally with the radiopharmaceutical and two groups of control mice were injected with the non radioactive complex and with sodium chloride 0.9% respectively. Before injecting each one of the solutions it was take a basal sample of peripheral blood of the mouse tail and each 48 h post-injection during 12 d. The animals were sacrificed to obtain the organs of interest and to determine the radioactivity in each one. The femur was used for the histopathologic studies. The quantification of the frequency of RET and RET-MN was carried out by flow cytometry of the sanguine samples and the Monte Carlo code MCNP4B for the dosimetry calculations was used. The

  20. Eu-, Tb-, and Dy-Doped Oxyfluoride Silicate Glasses for LED Applications

    DEFF Research Database (Denmark)

    Zhu, C.F.; Wang, J.; Zhang, M.M.

    2014-01-01

    Luminescence glass is a potential candidate for the light-emitting diodes (LEDs) applications. Here, we study the structural and optical properties of the Eu-, Tb-, and Dy-doped oxyfluoride silicate glasses for LEDs by means of X-ray diffraction, photoluminescence spectra, Commission Internationale...... de L’Eclairage (CIE) chromaticity coordinates, and correlated color temperatures (CCTs). The results show that the white light emission can be achieved in Eu/Tb/Dy codoped oxyfluoride silicate glasses under excitation by near-ultraviolet light due to the simultaneous generation of blue, green, yellow......, and red-light wavelengths from Tb, Dy, and Eu ions. The optical performances can be tuned by varying the glass composition and excitation wavelength. Furthermore, we observed a remarkable emission spectral change for the Tb3+ single-doped oxyfluoride silicate glasses. The 5D3 emission of Tb3+ can...

  1. Observation of room temperature saturated ferroelectric polarization in Dy substituted BiFeO3 ceramics

    KAUST Repository

    Zhang, Shuxia

    2012-04-06

    High quality Bi1− x Dy x FeO3 (0 ≤ x ≤ 0.15) ceramics have been fabricated by sintering Dy-doped BiFeO3 (BFO) precursor powders at a low temperature of 780 °C. The magnetic properties of BFO were improved by the introduction of Dy on the Bi-site. More importantly, well saturated ferroelectric hysteresis loops and polarization switching currents have been observed at room temperature. A large remnant polarization (2P r) value of 62 μC/cm2 is achieved, which is the highest value reported so far for rare-earth-doped BFO ceramics. Moreover, mechanisms for improved multiferroic properties depending on chemical doping-caused structure evolutions have also been discussed.

  2. Influence of Warp Yarn Tension on Cotton Greige and Dyed Woven Fabric Prosperities

    Directory of Open Access Journals (Sweden)

    Uzma Syed

    2013-01-01

    Full Text Available Fabric properties such as pilling and abrasion resistance and tensile strength vary when greige fabric is processed further. The quality of dyed fabric depends on the quality of greige fabric. Cotton Plain and Twill weave fabrics were woven at three different warp yarn tension and then dyed using monochlorotriazine, Drimerene Red Cl-5B dye gives difference in fabric properties. The ASTM, American International Standards were used to determine the greige and dyed fabric properties. It has been observed fabric woven at proper loom setting or warp yarn tension have high strength, less pilling and abrasion tendency as compared to fabric woven at variant warp yarn tension. Moreover, fabric tenacity is decreased after dyeing whereas, slight difference in pilling and abrasion values is observed after dyeing than that of greige fabric.

  3. Gauging the Auditory Dimensions of Dysarthric Impairment: Reliability and Construct Validity of the Bogenhausen Dysarthria Scales (BoDyS)

    Science.gov (United States)

    Ziegler, Wolfram; Staiger, Anja; Schölderle, Theresa; Vogel, Mathias

    2017-01-01

    Purpose: Standardized clinical assessment of dysarthria is essential for management and research. We present a new, fully standardized dysarthria assessment, the Bogenhausen Dysarthria Scales (BoDyS). The measurement model of the BoDyS is based on auditory evaluations of connected speech using 9 scales (traits) assessed by 4 elicitation methods.…

  4. X-ray induced fluorescence measurement of segregation in a DyI3 Hg metal-halide lamp

    Science.gov (United States)

    Nimalasuriya, T.; Curry, J. J.; Sansonetti, C. J.; Ridderhof, E. J.; Shastri, S. D.; Flikweert, A. J.; Stoffels, W. W.; Haverlag, M.; van der Mullen, J. J. A. M.

    2007-05-01

    Segregation of elemental Dy in a DyI3-Hg metal-halide high-intensity discharge lamp has been observed with x-ray induced fluorescence. Significant radial and axial Dy segregation are seen, with the axial segregation characterized by a Fischer parameter value of λ = 0.215 ± 0.002 mm-1. This is within 7% of the value (λ = 0.20 ± 0.01 mm-1) obtained by Flikweert et al (2005 J. Appl. Phys. 98 073301) based on laser absorption by neutral Dy atoms. Elemental I is seen to exhibit considerably less axial and radial segregation. Some aspects of the observed radial segregation are compatible with a simplified fluid picture describing two main transition regions in the radial coordinate. The first transition occurs in the region where DyI3 molecules are in equilibrium with neutral Dy atoms. The second transition occurs where neutral Dy atoms are in equilibrium with ionized Dy. These measurements are part of a larger study on segregation in metal-halide lamps under a variety of conditions.

  5. Cathodoluminescence and green-thermoluminescence response of CaSO{sub 4}:Dy,P films

    Energy Technology Data Exchange (ETDEWEB)

    Roman-Lopez, J., E-mail: holand_jeos@hotmail.com [CICATA-IPN, Legaria 694, D.F. 11500, Mexico, CIEMAT, Av., Complutense 22, Madrid 28040 (Spain); Correcher, V. [CIEMAT, Av., Complutense 22, Madrid 28040 (Spain); Garcia-Guinea, J. [Museo Nacional de Ciencias Naturales (CSIC), Jose Gutierrez Abascal 2, Madrid 28006 (Spain); Rivera, T.; Lozano, I.B. [CICATA-IPN, Legaria 694, D.F. 11500 (Mexico)

    2013-03-15

    We herein report on the cathodoluminescence (CL) and green-thermoluminescence (TL) emission of CaSO{sub 4}:Dy,P films deposited by the spray pyrolysis method at different temperatures. The samples have been previously structurally and chemically characterized by means of Raman spectroscopy and energy dispersive spectroscopy (EDS). The CL spectra show (i) a broad emission band centered at 374 nm that corresponds to the intrinsic emission of (SO{sub 4}){sup 2-} and (ii) emission bands centered on 486, 574, 668, 758 nm assigned to the electronic transitions of the Dy{sup 3+} ions. The TL glow curves of the films showed three groups of components peaked at around of 98, 152 and 300 Degree-Sign C that exhibit a gradual and progressively linear shifting of the T{sub max} as function of T{sub stop}. This TL behavior is related to a continuum in the trap distribution associated with general or multi-order kinetics and involving continuous processes of trapping-detrapping. The activation energy in the range of 0.97-1.53 eV has been estimated using the initial rise method. - Highlights: Black-Right-Pointing-Pointer The CaSO{sup 4}:Dy,P films were prepared by using the ultrasonic spray pyrolysis method. Black-Right-Pointing-Pointer Luminescence spectra of the CaSO{sub 4}:Dy,P films display the emission bands of the ions (SO{sub 4}){sup 2-} and Dy{sup 3+}. Black-Right-Pointing-Pointer The CaSO{sub 4}:Dy,P films were irradiated with a {sup 90}Sr/{sup 90}Y beta source. Black-Right-Pointing-Pointer The TL intensity of the films depends on the temperature of deposit.

  6. High-resolution spectroscopy, crystal-field calculations, and quadrupole helix chirality of DyFe3(BO34

    Directory of Open Access Journals (Sweden)

    Popova M.N.

    2017-01-01

    Full Text Available High-resolution polarized transmission spectra of DyFe3(BO34 single crystals were investigated in broad spectral (10-23000 cm−1 and temperature (3.5-300 K ranges. Energies of the dysprosium levels in the paramagnetic and antiferromagnetic phases were determined. On the basis of these data and preliminary calculations in the frameworks of the exchange-charge model, we determined the crystal-field and Dy-Fe exchange interaction parameters of the Dy3+ ions at sites with the point C2 symmetry corresponding to the enantiomorphic P3121 and P3221 space groups. The values of electronic quadrupole moments of the Dy3+ ions were calculated, which enabled us to interpret results of the work [Usui et al., Nature Mater. 13, 611 (2014] on the observation of domains of different quadrupole chirality in DyFe3(BO34.

  7. Ab initio study of double perovskites Ba2DySbO6

    Science.gov (United States)

    Jha, Dhiraj Kumar; Mandal, Golak; Ray, Chandan; Himanshu, A. K.; Singh, B. K.; Kumar, Uday; Choudhary, B. K.

    2016-05-01

    First principle study of the electronic band structure of Ba2DySbO6 synthesied by the solid state reaction technique have been performed within the framework of density function theory using WIEN2K. It has been shown in the absence of electron-electron interaction (U=0), BaDySO6 behaves like a half-metal. Even in the presence of DFT+U, electron-electron interaction via the Hubbard term (from U = 0, 2.72e -7.02eV), it still shows half metals.

  8. Ab initio study of double perovskites Ba{sub 2}DySbO{sub 6}

    Energy Technology Data Exchange (ETDEWEB)

    Jha, Dhiraj Kumar; Mandal, Golak; Singh, B. K. [Department of Physics, T.M. Bhagalpur University, Bhagalpur, Bihar 812007 (India); Ray, Chandan [Department of Applied Physics & Ballistics, F. M. University, Balasore, Odisha, 756019 (India); Himanshu, A. K., E-mail: akh@vecc.gov.in [Nanostructured & Advanced Material Laboratory, Variable Energy Cyclotron Centre, 1/AF, Bidhannagar, Saltlake, Kolkata-700064 (India); Kumar, Uday [Department of Physical Sciences, IISER Kolkata, Mohanpur Campus, Mohanpur, West Bengal (India); Choudhary, B. K. [Department of Physics, Ranchi University, Jharkhand-834001 (India)

    2016-05-23

    First principle study of the electronic band structure of Ba2DySbO{sub 6} synthesied by the solid state reaction technique have been performed within the framework of density function theory using WIEN2K. It has been shown in the absence of electron-electron interaction (U=0), BaDySO{sub 6} behaves like a half-metal. Even in the presence of DFT+U, electron-electron interaction via the Hubbard term (from U = 0, 2.72e -7.02 eV), it still shows half metals.

  9. Spontaneous magnetostriction in Dy/sub 2/(Fesub(1-x)Cosub(x))/sub 17/ compounds

    Energy Technology Data Exchange (ETDEWEB)

    Radwanski, R.J.; Figiel, H.; Krop, K. (Akademia Gorniczo-Hutnicza, Krakow (Poland)); Warchol, S. (Institute of Nuclear Research, Warsaw (Poland))

    1982-03-01

    Measurements are reported of the lattice parameters at 100 and 300 K of the Dy/sub 2/(Fesub(1-x)Cosub(x))/sub 17/ compound series. The dependence of the spontaneous magnetostriction on Co concentration was estimated taking into account Vegard's rule and the thermal expansion of Dy/sub 2/Fe/sub 17/. It was shown that these compounds exhibit a larger specific volume in the ferrimagnetic than in the paramagnetic state. The dependence of the spontaneous magnetostriction on the magnetisation was observed to be quadratic.

  10. Colour Changes in Fabrics Dyed with Vegetable Dyes Caused by Daylight and Washing

    OpenAIRE

    福田, 瑛子; 〓谷, 要; フクダ, エイコ; カツラヤ, カナメ; Eiko, FUKUDA; Kaname, KATURAYA

    2006-01-01

    An experiment was conducted on the colour of various samples (cotton, wool, nylon) dyed using vegetable dyes consisting of onion skin and tumeric along with the effects of fibre type and mordants on colour fastness to daylight and colour fastness to washing the results of wich are described below. Although colour fastness to daylight of fabric dyed with vegetable dye differs according to the type of fibre and vegetable dye as well as the mordant used, colour fastness to washing was high for a...

  11. Electrical Conductivity of Molten DyCl3-NaCl and DyCl3-KCl Systems: An Approach to Structural Interpretations of Rare Earth Chloride Melts

    Science.gov (United States)

    Iwadate, Yasuhiko; Ohkubo, Takahiro

    2017-11-01

    Electrical conductivities (κs) of molten DyCl3-NaCl and DyCl3-KCl systems were estimated by measuring the impedances of each mixture melt at any temperature and/or frequency. The molar volumes (Vms) were measured by dilatometry and represented as a polynomial empirical equation of temperature and composition. Due to both the properties, the molar conductivities (Λms) were calculated and their temperature and/or composition dependences were discussed from the standpoint of structural features as well. The κs increased curvilinearly with increasing temperature across the whole composition ranges. This trend was also applied to the Λms which was fitted by an Arrhenius-type equation. The relationship of Λms with melt composition was studied and the Λms were found to decrease with increasing composition of DyCl3. These findings were interpreted based on the results of structural science so far reported, and finally, the relationship between Λms and the structures of pure rare earth chloride melts was discussed.

  12. Hybridization of Single Nanocrystals of Cs4PbBr6 and CsPbBr3

    Science.gov (United States)

    2017-01-01

    Nanocrystals of all-inorganic cesium lead halide perovskites (CsPbX3, X = Cl, Br, I) feature high absorption and efficient narrow-band emission which renders them promising for future generation of photovoltaic and optoelectronic devices. Colloidal ensembles of these nanocrystals can be conveniently prepared by chemical synthesis. However, in the case of CsPbBr3, its synthesis can also yield nanocrystals of Cs4PbBr6 and the properties of the two are easily confused. Here, we investigate in detail the optical characteristics of simultaneously synthesized green-emitting CsPbBr3 and insulating Cs4PbBr6 nanocrystals. We demonstrate that, in this case, the two materials inevitably hybridize, forming nanoparticles with a spherical shape. The actual amount of these Cs4PbBr6 nanocrystals and nanohybrids increases for synthesis at lower temperatures, i.e., the condition typically used for the development of perovskite CsPbBr3 nanocrystals with smaller sizes. We use state-of-the-art electron energy loss spectroscopy to characterize nanoparticles at the single object level. This method allows distinguishing between optical characteristics of a pure Cs4PbBr6 and CsPbBr3 nanocrystal and their nanohybrid. In this way, we resolve some of the recent misconceptions concerning possible visible absorption and emission of Cs4PbBr6. Our method provides detailed structural characterization, and combined with modeling, we conclusively identify the nanospheres as CsPbBr3/Cs4PbBr6 hybrids. We show that the two phases are independent of each other’s presence and merge symbiotically. Herein, the optical characteristics of the parent materials are preserved, allowing for an increased absorption in the UV due to Cs4PbBr6, accompanied by the distinctive efficient green emission resulting from CsPbBr3. PMID:28919935

  13. Postsynthesis Transformation of Insulating Cs4PbBr6 Nanocrystals into Bright Perovskite CsPbBr3 through Physical and Chemical Extraction of CsBr

    Science.gov (United States)

    2017-01-01

    Perovskite-related Cs4PbBr6 nanocrystals present a “zero-dimensional” crystalline structure where adjacent [PbBr6]4– octahedra do not share any corners. We show in this work that these nanocrystals can be converted into “three-dimensional” CsPbBr3 perovskites by extraction of CsBr. This conversion drastically changes the optoelectronic properties of the nanocrystals that become highly photoluminescent. The extraction of CsBr can be achieved either by thermal annealing (physical approach) or by chemical reaction with Prussian Blue (chemical approach). The former approach can be simply carried out on a dried film without addition of any chemicals but does not yield a full transformation. Instead, reaction with Prussian Blue in solution achieves a full transformation into the perovskite phase. This transformation was also verified on the iodide counterpart (Cs4PbI6). PMID:29285525

  14. Ozone Depletion Potential of CH3Br. Appendix H

    Science.gov (United States)

    Ko, Malcolm K. W.; Sze, Nien Dak; Scott, Courtney; Rodriguez, Jose M.; Weisenstein, Debra K.; Sander, Stanley P.

    1998-01-01

    The ozone depletion potential (ODP) of methyl bromide (CH3Br) can be determined by combining the model-calculated bromine efficiency factor (BEF) for CH3Br and its atmospheric lifetime. This paper examines how changes in several key kinetic data affect BEF. The key reactions highlighted in this study include the reaction of BrO + HO2, the absorption cross section of HOBr, the absorption cross section and the photolysis products of BrONO2, and the heterogeneous conversion of BrONO2 to HOBr and HNO3 on aerosol particles. By combining the calculated BEF with the latest estimate of 0.7 year for the atmospheric lifetime of CH3Br, the likely value of ODP for CH3Br is 0.39. The model-calculated concentration of HBr (approx. 0.3 pptv) in the lower stratosphere is substantially smaller than the reported measured value of about 1 pptv. Recent publications suggested models can reproduce the measured value if one assumes a yield for HBr from the reaction of BrO + OH or from the reaction of BrO + HO2. Although the evaluation concluded any substantial yield of HBr from BrO + HO2 is unlikely, for completeness, we calculate the effects of these assumed yields on BEF for CH3Br. Our calculations show that the effects are minimal: practically no impact for an assumed 1.3% yield of HBr from BrO + OH and 10% smaller for an assumed 0.6% yield from BrO + HO2.

  15. Synthesis and characterization of CaF{sub 2}:Dy nanophosphor for dosimetric application

    Energy Technology Data Exchange (ETDEWEB)

    Bhadane, Mahesh S.; Dahiwale, S. S.; Bhoraskar, V. N.; Dhole, S. D., E-mail: sanjay@physics.unipune.ac.in [Department of Physics, University of Pune, Pune-411007 (India); Patil, B. J. [Department of Physics, Abasaheb Garware College, Pune-411004 (India); Kulkarni, M. S. [Radiation Safety Systems Division, Bhabha Atomic Research Centre, Mumbai 400 085 (India); Bhatt, B. C. [Radiological Physics and Advisory Division, Bhabha Atomic Research Centre, Mumbai 400 085 (India)

    2015-06-24

    In this work, nanoparticles (NPs) of dysprosium doped calcium fluoride (CaF{sub 2}:Dy) 1 mol % has been prepared using simple chemical co-precipitation method and its thermoluminescence (TL) dosimetric properties were studied. The synthesized nanoparticle sample was characterized by X-ray diffraction (XRD) and the particle size of face centered cubic phase NPs was found around 30 nm. The shape, morphology and size were also observed by scanning electron microscopy (SEM). From gamma irradiated CaF{sub 2}:Dy TL curves, it was observed that the total areas of all the glow peak intensities are dramatically changed with increase in annealing temperature. Further, TL glow curve of the CaF{sub 2}:Dy at 183 °C annealed at 400 °C, showed very sharp linear response in the dose range from 1 Gy to 750 Gy. This linear response of CaF{sub 2}:Dy nanophosphor as a function of gamma dose is very useful from radiation dosimetric point of view.

  16. A microscopic study of deformation systematics in 154− 166Dy ...

    Indian Academy of Sciences (India)

    The Hartree–Bogoliubov (HB) framework of calculations has been applied for calculating various nuclear structure quantities for 154−166Dy mass chains. In this framework, the intrinsic quadrupole moments, the low-lying yrast states ( E 2 + and E 4 + ) and occupation numbers for various shell model orbits have been ...

  17. Influence of annealing temperature on the Dy diffusion process in NdFeB magnets

    Science.gov (United States)

    Hu, Sheng-qing; Peng, Kun; Chen, Hong

    2017-03-01

    Sintered NdFeB magnets were coated with a layer of Dy metal using electron beam evaporation method and then annealed at various temperatures to investigate the temperature dependence of Dy diffusion process in NdFeB magnets. A Dy-rich phase was observed along the grain boundaries after the grain boundary diffusion process, the diffusion coefficients of various temperatures were obtained, the diffusion coefficients of Dy along the grain boundaries at 800 °C and 900 °C were determined to be 9.8×10-8 cm2 s-1 and 2.4×10-7 cm2 s-1, respectively. The diffusion length depended on the annealing temperature and the maximum diffusion length of approximately 1.8 mm and 3.0 mm can be obtained after annealing at 800 °C and 900 °C for 8 h. Higher diffusion temperature results in the diffusion not only along the grain boundaries but also into grains and then decrease in magnetic properties. The optimum annealing conditions can be determined as 900 °C for 8 h. The coercivity was improved from 1040 kA/m to 1450 kA/m and its magnetization has no significant reduction after the grain boundary diffusion process at the optimum annealing conditions.

  18. Absence of commensurate ordering at the polarization flop transition in multiferroic DyMnO3

    NARCIS (Netherlands)

    Strempfer, J.; Bohnenbuck, B.; Mostovoy, M.; Aliouane, N.; Argyriou, D. N.; Schrettle, F.; Hemberger, J.; Krimmel, A.; von Zimmermann, M.

    Ferroelectric spiral magnets DyMnO3 and TbMnO3 show similar behavior of electric polarization in applied magnetic fields. Studies of the field dependence of lattice modulations on the contrary show a completely different picture. Whereas in TbMnO3 the polarization flop from P parallel to c to P

  19. A microscopic study of deformation systematics in 154−166Dy ...

    Indian Academy of Sciences (India)

    A microscopic study of deformation systematics in 154−166Dy isotopes. AMITA DUA, ARUN BHARTI. ∗ and S K KHOSA. Department of Physics, University of Jammu, Jammu & Kashmir 180 006, India. ∗. Corresponding Author. E-mail: arunbharti 2003@yahoo.co.in. MS received 30 March 2006; revised 9 March 2007; ...

  20. Structural and optical characteristics of Ce, Nd, Gd, and Dy-doped ...

    Indian Academy of Sciences (India)

    Ashwini S Varpe

    2017-06-19

    Jun 19, 2017 ... use in applications like gate dielectric material and in coating industry. .... smaller. However, small clusters can coalesce by surface diffusion ..... industry. Under ultraviolet excitation, Ce, Gd, and Dy- doped thin films show emissions in the visible region while Nd:Al2O3 shows emissions in the IR region. The.

  1. Dy 3-activated M2SiO4 (M= Ba, Mg, Sr)-type phosphors

    Indian Academy of Sciences (India)

    The alkaline orthosilicates of M 2 SiO 4 (M = Ba, Mg, Sr) activated with Dy 3 + and co-doped with Ho 3 + are prepared through conventional solid-state method, i.e., mixing and grinding of solid form precursors followedby high-temperature heat treatments of several hours in furnaces, generally under open atmosphere and ...

  2. Spin structure and magnetic frustration in multiferroic RMn2O5 (R=Tb,Ho,Dy)

    NARCIS (Netherlands)

    Blake, G.R.; Chapon, L.C.; Radaelli, P.G.; Park, S.; Hur, N.; Cheong, S-W.; Rodríguez-Carvajal, J.

    2005-01-01

    We have studied the crystal and magnetic structures of the magnetoelectric materials RMn2O5 (R=Tb,Ho,Dy) using neutron diffraction as a function of temperature. All three materials display incommensurate antiferromagnetic ordering below 40 K, becoming commensurate on further cooling. For R=Tb,Ho, a

  3. Optical absorption and fluorescence studies of Dy{sup 3+}-doped lead telluroborate glasses

    Energy Technology Data Exchange (ETDEWEB)

    Vijaya Kumar, M.V. [Department of Physics, Rayalaseema University, Kurnool 518002 (India); Jamalaiah, B.C., E-mail: bcjamal@gmail.com [Department of Physics, Sree Vidyanikethan Engineering College, Tirupati 517102 (India); Rama Gopal, K.; Reddy, R.R. [Department of Physics, Sri Krishnadevaraya University, Anantapur 515003 (India)

    2012-01-15

    Lead telluroborate (PTBDy) glasses doped with different Dy{sup 3+} ion concentrations were prepared by melt quenching technique and investigated through optical absorption, fluorescence and decay measurements. The Judd-Ofelt intensity parameters ({Omega}{sub {lambda}}) are obtained by a least square fit analysis. The small root mean square deviation of {+-}0.34x10{sup -6} shows a good fit between the experimental and calculated oscillator strengths. The radiative properties of the {sup 4}F{sub 9/2}{yields}{sup 6}H{sub 13/2} emission transition of PTBDy10 glass are determined and compared to the other reported glasses. The variation of decay time of the {sup 4}F{sub 9/2} emission state is attributed to the interaction among the excited Dy{sup 3+} ions at higher concentration. The PTBDy10 glass is found to be a suitable candidate for solid state laser materials to produce intense yellow (576 nm) luminescence through the {sup 4}F{sub 9/2}{yields}{sup 6}H{sub 13/2} transition. - Highlights: > Interaction among Dy{sup 3+} ions at higher concentrations causes concentration quenching. > The radiative properties are determined within the frame work of Judd-Ofelt theory. > Variation of decay time of {sup 4}F{sub 9/2} emission state is attributed to interactions among the Dy{sup 3+} ions at higher concentration. > The PTBDy10 glass is a suitable material for 576 nm laser applications.

  4. An evaluation of UV protection imparted by cotton fabrics dyed with natural colorants

    Directory of Open Access Journals (Sweden)

    Sarkar Ajoy K

    2004-10-01

    Full Text Available Abstract Background The ultraviolet properties of textiles dyed with synthetic dyes have been widely reported in literature. However, no study has investigated the ultraviolet properties of natural fabrics dyed with natural colorants. This study reports the Ultraviolet Protection Factor (UPF of cotton fabrics dyed with colorants of plant and insect origins. Methods Three cotton fabrics were dyed with three natural colorants. Fabrics were characterized with respect to fabric construction, weight, thickness and thread count. Influence of fabric characteristics on Ultraviolet Protection Factor was studied. Role of colorant concentration on the ultraviolet protection factor was examined via color strength analysis. Results A positive correlation was observed between the weight of the fabric and their UPF values. Similarly, thicker fabrics offered more protection from ultraviolet rays. Thread count appears to negatively correlate with UPF. Dyeing with natural colorants dramatically increased the protective abilities of all three fabric constructions. Additionally, within the same fabric type UPF values increased with higher depths of shade. Conclusion Dyeing cotton fabrics with natural colorants increases the ultraviolet protective abilities of the fabrics and can be considered as an effective protection against ultraviolet rays. The UPF is further enhanced with colorant of dark hues and with high concentration of the colorant in the fabric.

  5. THE ANGULAR-MOMENTUM DEPENDENCE OF THE GIANT-DIPOLE RESONANCE IN DY-154

    NARCIS (Netherlands)

    NOORMAN, RF; BACELAR, JC; HARAKEH, MN; HESSELINK, WHA; HOFMANN, HJ; Kalantar-Nayestanaki, Nasser; VANSCHAGEN, JPS; STOLK, A; SUJKOWSKI, Z; DEVOIGT, MJA; VANDERWOUDE, A

    1994-01-01

    The statistical gamma-ray decay of the compound nucleus 154Dy* formed at an excitation energy of 69 MeV is studied in three angular-momentum windows [J] = 31,42 and 50h. The GDR strength function extracted from the data indicates a constant centroid energy for the resonance E(GDR) = 15.2 +/- 0.5

  6. Antiferromagnetic order and spin glass behavior in Dy{sub 2}CuIn{sub 3}

    Energy Technology Data Exchange (ETDEWEB)

    Siouris, I.M., E-mail: jsiou@pme.duth.gr [Democritus University of Thrace (DUTH), Production and Management Engineering Department, Materials Laboratory, 67100 Xanthi (Greece); Kremer, R.K. [Max-Planck-Institut fuer Festkoerperforschung, Heisenbergstrasse 1, D-70569 Stuttgart (Germany); Hoelzel, M. [Technische Universitaet Muenchen, Forschungsneutronenquelle Heinz Maier-Leibnitz (FRM II), 85748 Garching (Germany)

    2011-11-15

    The magnetic properties of the intermetallic compound Dy{sub 2}CuIn{sub 3} have been investigated. Ac and dc-susceptibility measurements indicate an onset of antiferromagnetic ordering at T{sub N}=19.5 K and an additional frequency dependent transition at T{sub ds}{approx}9 K. Neutron diffraction studies confirm the ordered transition at 19.5{+-}1 K. The magnetic unit cell can be described by the propagation vector k=(0.25,0.25,0) with the magnetic moment {mu}=2.63(4){mu}{sub B}/Dy{sup 3+} parallel to the c-axis. Nevertheless, neutron diffraction reveals no additional magnetic phase transition around or below 9 K, which suggests that, at lower temperatures, a spin glass state may be formed in coexistence with the antiferromagnetic mode as a result of frustration and the antagonism between ferromagnetic and antiferromagnetic exchange interactions. - Highlights: > Dy{sub 2}CuIn{sub 3} is characterized by the dominance of antiferromagnetic (AF) interactions. > Geometric frustration and crystal field effects prevent the formation of the full magnetic moment on the Dy ions. > Two magnetic regimes are recognized: an AF state and a mixed AF-glassy state. > The antiferromagnetic structure of the compound has been determined.

  7. Dyed and Printed Textiles: Javanese Batik [and] Dutch Wax Prints [and] West African Adire. Third Edition.

    Science.gov (United States)

    Burke, Sue

    Three booklets focusing on dyed and printed textile techniques of Java, West Africa, and the Netherlands describe historical and ethnographic materials as well as the development of particular technical traditions. Each section may be used alone or with either or both of the others. When used together, these booklets illustrate the…

  8. [Luminescence properties of thenardite activated with Dy3+ under vacuum ultraviolet excitation].

    Science.gov (United States)

    Taximaiti, Yusufu; Ajimu, Abulai; Su, Zong-Cai; Aierken, Sidike

    2011-08-01

    Na2SO4: Dy3+ phosphors were prepared by heating pure natural thenardite (Na2SO4) with DyF3 at 900 degrees C for 25 min in air studied the Luminescence properties of Na2SO4: Dy3+ were studied by synchrotron radiation. Their photoluminescence (PL) spectra were also investigated under vacuum ultraviolet-ultraviolet (VUV-UV) at room temperature. According to the emission spectra, the yellow-blue ratio (Y/B) is different under different concentrations of Dy3+ and the position of excitation. And the excitation spectrum is consisted of strong bands assigned to the 4f9-->4f8 5d transition at 172 nm, the O(2-)- Tm3+ charge transfer band at 165 nm and weak bands assigned to host absorption (138, 245 nm) and the 6 H15/2-->4D7/2, 6H15/2-->6P3/2, and 6H15/2-->6P7/2 transition at 299, 325 and 351 nm respectively.

  9. Electrical transport and magnetic ordering in R2Ti3Ge4 (R = Dy, Ho ...

    Indian Academy of Sciences (India)

    Abstract. New R2Ti3Ge4 (R = Dy, Ho and Er) intermetallic compounds have been synthesized and characterized by X-ray diffraction and low temperature ac magnetic susceptibility, electrical re- sistivity and thermoelectric power measurements were carried out. The compounds crystallize in the parent, Sm5Ge4-type ...

  10. High coercivity in Fe-Nb-B-Dy bulk nanocrystalline magnets

    Energy Technology Data Exchange (ETDEWEB)

    Ziolkowski, Grzegorz; Chrobak, Artur; Klimontko, Joanna [Institute of Physics, University of Silesia, Uniwersytecka 4, 40-007, Katowice (Poland); Chrobak, Dariusz; Rak, Jan [Institute of Materials Science, University of Silesia, 75 Pulku Piechoty 1, 41-500, Chorzow (Poland); Zivotsky, Ondrej; Hendrych, Ales [Department of Physics, VSB-TU Ostrava, Ostrava (Czech Republic)

    2016-11-15

    The paper refers to structural and magnetic properties of the (Fe{sub 80}Nb{sub 6}B{sub 14}){sub 1-x}Dy{sub x} (x = 0.08, 0.10, 0.12, 0.16) bulk nanocrystalline alloys prepared by making use of the vacuum suction casting technique. The samples are in a form of rods with different diameters d = 1.5, 1, and 0.5 mm. The phase structure was investigated by XRD technique and reveals an occurrence of magnetically hard Dy{sub 2}Fe{sub 14}B as well as other relatively soft Dy-Fe, Fe-B, and Fe phases dependently on the Dy content. The alloys show hard magnetic properties with high coercive field up to 5.5 T (for x = 0.12 and d = 0.5 mm). The observed magnetic hardening effect with the increase of cooling rate (decrease of sample diameter d) can be attributed to a formation of ultra-hard magnetic objects as well as increasing role of low dimensional microstructure. (copyright 2016 WILEY-VCH Verlag GmbH and Co. KGaA, Weinheim)

  11. Synthesis, characterization and photoluminescence properties of Dy3+ -doped nano-crystalline SnO2.

    CSIR Research Space (South Africa)

    Pillai, SK

    2010-04-15

    Full Text Available Nano-crystalline of tin oxide doped with varying wt% of Dy3+ was prepared using chemical coprecipitation method and characterised by various advanced techniques such as BET-surface area, Fourier transform infrared spectroscopy, X-ray diffraction...

  12. Thermoluminescence characteristics of MgSO sub 4 :Dy,Mn phosphor

    CERN Document Server

    Luo Da Ling; Deng Zou Ping; Li Guo Zhen

    1999-01-01

    The MgSO sub 4 :Dy,Mn thermoluminescence (TL) phosphors have been prepared by co-doping with various concentrations of activators the Dy and Mn. The dose-responses to gamma-rays are studied by deconvolution of the TL glow curves. It is found that the TL sensitivity of the MgSO sub 4 :Dy,Mn phosphor is comparable to that of the phosphor LiF:Mg,Ti. Besides, there is only one main dosimetric peak at 383 deg. C in its TL glow curve. The trap parameters of the dosimetric peak were obtained as activation energy E approx 1.972 eV, the frequency-factor s approx 4.294x10 sup 1 sup 4 s sup - sup 1 and the kinetic order b approx 2 by fitting the glow curves with general-order kinetics. The area of this dosimetric peak is approx 90% of the integral area of the whole glow curve for a gamma dose range of 0.1 Gy-20 kGy. The dose response of MgSO sub 4 :Dy,Mn to gamma-rays in this dose range is supralinear. There are no radiation damage effects observed in TL glow curves above 1 kGy as that occurred in LiF dosimeters.

  13. Role of some rare earth (RE) ions (RE= La, Pr, Nd, Sm, Gd and Dy ...

    Indian Academy of Sciences (India)

    ) zirconia), tendency of phase transformation (tetragonal to monoclinic () zirconia) and lattice strain were studied with mechanical property e.g. tensile strength of sol–gel derived ZrO2–2 mol% RE2O3 (RE = La, Pr, Nd, Sm, Gd and Dy) spun ...

  14. Peak effect in surface resistance at microwave frequencies in Dy-123 thin films

    NARCIS (Netherlands)

    Bhangale, A.R.; Banerjee, T.; Raychaudhuri, P.; Bhagwat, S.S.; Pai, S.P.; John, J.; Bagwe, V.C.; Shirodkar, V.S.

    2002-01-01

    A pronounced peak in the microwave (at frequency 9.55 GHz) surface resistance, Rs vs. T plot (where T is the temperature) has been observed in epitaxial DyBa2Cu3O7−y superconducting thin films in magnetic fields (parallel to c-axis) in the range 2 to 8 kOe, and temperatures close to the

  15. Excellent magnetocaloric properties in RE2Cu2Cd (RE = Dy and Tm) compounds and its composite materials.

    Science.gov (United States)

    Zhang, Yikun; Yang, Yang; Xu, Xiao; Geng, Shuhua; Hou, Long; Li, Xi; Ren, Zhongming; Wilde, Gerhard

    2016-09-26

    The magnetic properties and magnetocaloric effect (MCE) of ternary intermetallic RE2Cu2Cd (RE = Dy and Tm) compounds and its composite materials have been investigated in detail. Both compounds undergo a paramagnetic to ferromagnetic transition at its own Curie temperatures of TC ~ 48.5 and 15 K for Dy2Cu2Cd and Tm2Cu2Cd, respectively, giving rise to the large reversible MCE. An additionally magnetic transition can be observed around 16 K for Dy2Cu2Cd compound. The maximum values of magnetic entropy change (-ΔSM(max)) are estimated to be 17.0 and 20.8 J/kg K for Dy2Cu2Cd and Tm2Cu2Cd, for a magnetic field change of 0-70 kOe, respectively. A table-like MCE in a wide temperature range of 10-70 K and enhanced refrigerant capacity (RC) are achieved in the Dy2Cu2Cd - Tm2Cu2Cd composite materials. For a magnetic field change of 0-50 kOe, the maximum improvements of RC reach 32% and 153%, in comparison with that of individual compound Dy2Cu2Cd and Tm2Cu2Cd. The excellent MCE properties suggest the RE2Cu2Cd (RE = Dy and Tm) and its composite materials could be expected to have effective applications for low temperature magnetic refrigeration.

  16. Tunable luminescence mediated by energy transfer in Tm3+/Dy3+ co-doped phosphate glasses under UV excitation

    Science.gov (United States)

    Chen, Yong; Chen, Guohua; Liu, Xiangyu; Yuan, Changlai; Zhou, Changrong

    2017-11-01

    Tm3+/Dy3+ co-doped phosphate glasses for white light-emitting diodes were synthesized by a conventional melting-quenching method. A spectroscopic research based on optical, photoluminescence spectrum and decay time curves in Tm3+/Dy3+ co-doped phosphate glasses was carried out. The color of luminescence could be tuned by altering the concentrations of Tm3+ ions. Under UV light excitation, the CIE chromaticity coordinates (0.3471, 0.3374) and color correlate temperature (CCT = 4866.21 K) close to the standard white-light illumination (0.333, 0.333 and CCT = 5454.12 K) could be achieved in 0.4 Tm3+/0.6 Dy3+ (mol %) co-doped glass sample. The decrease of the Dy3+ emission decay time in existence of Tm3+ ascertained that non-radiative energy transfer from Dy3+ to Tm3+ occurred. Moreover, the research of energy transfers between Dy3+ and Tm3+ based on the Inokuti-Hirayama model revealed that an electric quadrupole-quadrupole interaction might be the predominant mechanism participated in the energy transfer. This finding suggests that the as-prepared Tm3+/Dy3+ co-doped phosphate glasses may be promising candidate for white LEDs and other display devices.

  17. AsTeRICS.

    Science.gov (United States)

    Drajsajtl, Tomáš; Struk, Petr; Bednárová, Alice

    2013-01-01

    AsTeRICS - "The Assistive Technology Rapid Integration & Construction Set" is a construction set for assistive technologies which can be adapted to the motor abilities of end-users. AsTeRICS allows access to different devices such as PCs, cell phones and smart home devices, with all of them integrated in a platform adapted as much as possible to each user. People with motor disabilities in the upper limbs, with no cognitive impairment, no perceptual limitations (neither visual nor auditory) and with basic skills in using technologies such as PCs, cell phones, electronic agendas, etc. have available a flexible and adaptable technology which enables them to access the Human-Machine-Interfaces (HMI) on the standard desktop and beyond. AsTeRICS provides graphical model design tools, a middleware and hardware support for the creation of tailored AT-solutions involving bioelectric signal acquisition, Brain-/Neural Computer Interfaces, Computer-Vision techniques and standardized actuator and device controls and allows combining several off-the-shelf AT-devices in every desired combination. Novel, end-user ready solutions can be created and adapted via a graphical editor without additional programming efforts. The AsTeRICS open-source framework provides resources for utilization and extension of the system to developers and researches. AsTeRICS was developed by the AsTeRICS project and was partially funded by EC.

  18. Discharge flow kinetic study of the reactions of NO sub 3 with Br, BrO, HBr, and HCl

    Energy Technology Data Exchange (ETDEWEB)

    Mellouki, A.; Poulet, G.; Le Bras, G. (C.N.R.S., Orleans (France)); Singer, R.; Burrows, J.P.; Moortgat, G.K. (Max-Planck Institut fuer Chemie, Mainz (Germany, F.R.))

    1989-11-30

    The reactions of NO{sub 3} with Br, BrO, HBr, and HCl have been studied at 298 K by using the discharge-flow EPR method. In the study of the reactions of NO{sub 3} with Br and BrO, where NO{sub 3} and Br or BrO were flowed separately in the presence of excess NO{sub 3}, the following rate constants were found: k{sub 1} = (1.6 {plus minus} 0.7) {times} 10{sup {minus}11} for NO{sub 3} + Br {yields} NO{sub 2} + BrO (1) and 0.3 {times} 10{sup {minus}12} {le} k{sub 3} {le} 3 {times} 10{sup {minus}12} for NO{sub 3} + BrO {yields} Br + NO{sub 2} + O{sub 2} (3). Units are cm{sup 3} molecule{sup {minus}1} s{sup {minus}1}. For the reactions NO{sub 3} + HCl {yields} products (6) and NO{sub 3} + HBr {yields} products (7), the upper limits k{sub 6} {le} 5 {times} 10{sup {minus}17} and k{sub 7} {le} 1 {times} 10{sup {minus}16} were obtained.

  19. Organization of the TC and TE cT-DNA regions in Nicotiana otophora and functional analysis of three diverged TE-6b genes.

    Science.gov (United States)

    Chen, Ke; de Borne, François Dorlhac; Sierro, Nicolas; Ivanov, Nikolai V; Alouia, Malek; Koechler, Sandrine; Otten, Léon

    2018-02-03

    Nicotiana otophora contains Agrobacterium-derived T-DNA sequences introduced by horizontal gene transfer (Chen et al., 2014). Sixty-nine contigs were assembled into four different cT-DNAs, totalling 83 kb. TC and TE result from two successive transformation events, each followed by duplication, yielding two TC and two TE inserts. TC is also found in other Nicotiana species, whereas TE is unique for N. otophora. Both cT-DNA regions are partially duplicated inverted repeats. Analysis of the cT-DNA divergence patterns allowed reconstruction of the evolution of the TC and TE regions. TC and TE carry ten intact open reading frames. Three of these are TE-6b genes, derived from a single 6b gene carried by the Agrobacterium strain which inserted TE in the N. otophora ancestor. 6b genes have so far only been found on A. tumefaciens or A. vitis T-DNAs and strongly modify plant growth (Chen and Otten, 2016). The TE-6b genes were expressed in N. tabacum under the constitutive 2x35S promoter. TE-1-6b-R and TE-2-6b led to shorter plants, dark-green leaves, a strong increase in leaf vein development, and modified petiole wings. TE-1-6b-L expression led to a similar phenotype, but in addition, leaves show outgrowths at the margins, flowers were modified and plants became viviparous, i. e. embryos germinated in the capsules at an early stage of their development. Embryos could be rescued by culture in vitro. The TE-6b phenotypes are very different from the earlier described 6b phenotypes and could provide new insight into the mode of action of the 6b genes. This article is protected by copyright. All rights reserved. This article is protected by copyright. All rights reserved.

  20. Brüssel Euroopa pealinnaks? / Ülar Mark

    Index Scriptorium Estoniae

    Mark, Ülar, 1968-

    2009-01-01

    Brüsseli Euroopa kvartali planeerimisvõistlusest, mille peakorraldaja oli Brüsseli pealinna piirkond koos Brüsseli linna ja Euroopa Komisjoniga. Eestist osales žüriis arhitekt Ülar Mark. Meeskonna Atelier Christian de Portzamparc võidutööst ja teiste teise vooru pääsenud nelja meeskonna (JDS / Julien De Smedt Architects, OMA / Office for Metropolitan Architecture, Xaveer De Geyter Architect, Fletcher Priest Architects) töödest

  1. BrO measurements over the Eastern North-Atlantic

    Directory of Open Access Journals (Sweden)

    U. Platt

    2009-12-01

    Full Text Available The aim of the work presented here was to detect BrO in the marine boundary layer over the Eastern North-Atlantic by Multi AXis-Differential Optical Absorption Spectroscopy (MAX-DOAS of scattered sunlight. With this technique, information about the concentration and the vertical profile of trace gases in the atmosphere can be gained. BrO can be formed in the marine atmosphere by degradation of biogenic organohalogens or by oxidation of bromide in sea salt aerosol. BrO influences the chemistry in marine air in many ways, e.g. since it catalytically destroys ozone, changes the NO2/NO-ratio as well as the OH/HO2-ratio and oxidises DMS. However, the abundance and the significance of BrO in the marine atmosphere is not yet fully understood. <br>> We report on data collected during a ship cruise, which took place along the West African Coast in February 2007, within the framework of the Surface Ocean PRocesses in the ANthropocene project (SOPRAN. Tropospheric BrO could be detected during this cruise at peak mixing ratios of (10.2±3.7 ppt at an assumed layer height of 1 km on 18 February 2007. Furthermore, it was found that the mean BrO concentrations increased when cruising close to the African Coast suggesting that at least part of the BrO might have originated from there.

  2. Hurtigste versus mest brændstoføkonomiske ruter

    DEFF Research Database (Denmark)

    Andersen, Ove; Krogh, Benjamin Bjerre; Lahrmann, Harry

    2013-01-01

    Der er stort fokus på at forbedre brændstoføkonomien i transportbranchen generelt. I denne artikel anvendes brændstoftallene fra Controller Area Network Bus (CANBus) kombineret med GPS data til at skabe et digitalt vejkort, hvor det er muligt at sammenligne de hurtigste ruter med de mest...... brændstoføkonomiske ruter. Kortet er baseret på ca. 100 millioner CANBus observationer og ca. 2,1 milliarder GPS observationer. Hovedkonklusionen er, at CANBus data kan anvendes til at estimere brændstofforbruget for en rute. Sammenlignet med estimering af køretider er det mere kompliceret at estimere...

  3. Product vibrational distributions in CH 3Br photodissociation

    Science.gov (United States)

    Escure, Christelle; Leininger, Thierry; Lepetit, Bruno

    2009-09-01

    We performed a theoretical study of the photodissociation dynamics of CH 3Br in the A˜ band using a wavepacket propagation technique on coupled ab initio potential energy surfaces corresponding to the 3Q 1 and 1Q 1 states correlated at large distance with the Br ground spin-orbit state, as well as the 3Q 0 and 4E states correlated to the excited one. The methyl umbrella vibrational product state distributions are found in very good agreement with experimental results. They are hotter for Br than for Br ∗, and this is related to the shapes of the 3Q 0 and 1Q 1 potentials.

  4. In situ Spectroscopy of Solid-State Chemical Reaction in PbBr2-Deposited CsBr Crystals

    Science.gov (United States)

    Kondo, Shin-ichi; Matsunaga, Toshihiro; Saito, Tadaaki; Asada, Hiroshi

    2003-09-01

    It is possible to measure the fundamental optical absorption spectra of CsPbBr3 and Cs4PbBr6, whose stability is predicted by the study of phase diagram in the binary system CsBr-PbBr2, by means of in situ optical absorption and reflection spectroscopy of thermally induced solid-state chemical reaction in PbBr2-deposited CsBr crystals. On heavy annealing of the crystals, the Pb2+ ions are uniformly dispersed in the crystal matrix. The present experiment provides a novel method for measuring intrinsic optical absorption of ternary metal halides and also for in situ monitoring of doping metal halide crystal with impurities (metal ions or halogen ions).

  5. Determination of nuclear cross-section of 81Br (n,,,) Br82 reaction by ...

    African Journals Online (AJOL)

    ... flux of 4.2 x 1013 n cm-2 s-1. The BaBr2 was chemically processed and measured as Hydrogen Bromide (HBr82). The value of nuclear cross-section was determined to be 2.1 0.2 barns, which falls within the range of values as previously reported elsewhere. (Journal of Applied Science and Technology: 2001 6(1-2): 4-6) ...

  6. Calculations of the magnetic entropy change in amorphous through a microscopic anisotropic model: Applications to Dy{sub 70}Zr{sub 30} and DyCo{sub 3.4} alloys

    Energy Technology Data Exchange (ETDEWEB)

    Ranke, P. J. von, E-mail: von.ranke@uol.com.br; Nóbrega, E. P.; Ribeiro, P. O.; Alvarenga, T. S. T.; Lopes, P. H. O.; Sousa, V. S. R. de; Oliveira, N. A. de [Instituto de Física, Universidade do Estado do Rio de Janeiro—UERJ, Rua São Francisco Xavier, 524, 20550-013 Rio de Janeiro (Brazil); Caldas, A. [Sociedade Unificada de Ensino Superior e Cultura, SUESC, 20211-351 Rio de Janeiro (Brazil); Alho, B. P. [Instituto de Aplicação Fernando Rodrigues da Silveira, Universidade do Estado do Rio de Janeiro, Rua Santa Alexandrina, 288, 20260-232 Rio de Janeiro (Brazil); Carvalho, G. [Laboratório Nacional de Luz Sincroton—LNLS, 13083-970 Campinas, São Paulo (Brazil); Magnus, A.

    2014-10-14

    We report theoretical investigations on the magnetocaloric effect, described by the magnetic entropy change in rare earth—transition metal amorphous systems. The model includes the local anisotropy on the rare earth ions in Harris-Plischke-Zuckermann assumptions. The transition metals ions are treated in terms of itinerant electron ferromagnetism and the magnetic moment of rare earth ions is coupled to the polarized d-band by a local exchange interaction. The magnetocaloric effect was calculated in DyCo{sub 3.4} system, which presents amorphous sperimagnetic configuration. The calculations predict higher refrigerant capacity in the amorphous DyCo{sub 3.4} than in DyCo{sub 2} crystal, highlighting the importance of amorphous magnetocaloric materials. Our calculation of the magnetocaloric effect in Dy{sub 70}Zr{sub 30}, which presents amorphous asperomagnetic configuration, is in good agreement with the experimental result. Furthermore, magnetic entropy changes associated with crystal-amorphous configurations change are estimated.

  7. Exploring Polaronic, Excitonic Structures and Luminescence in Cs4PbBr6/CsPbBr3.

    Science.gov (United States)

    Kang, Byungkyun; Biswas, Koushik

    2018-02-15

    Among the important family of halide perovskites, one particular case of all-inorganic, 0-D Cs 4 PbBr 6 and 3-D CsPbBr 3 -based nanostructures and thin films is witnessing intense activity due to ultrafast luminescence with high quantum yield. To understand their emissive behavior, we use hybrid density functional calculations to first compare the ground-state electronic structure of the two prospective compounds. The dispersive band edges of CsPbBr 3 do not support self-trapped carriers, which agrees with reports of weak exciton binding energy and high photocurrent. The larger gap 0-D material Cs 4 PbBr 6 , however, reveals polaronic and excitonic features. We show that those lattice-coupled carriers are likely responsible for observed ultraviolet emission around ∼375 nm, reported in bulk Cs 4 PbBr 6 and Cs 4 PbBr 6 /CsPbBr 3 composites. Ionization potential calculations and estimates of type-I band alignment support the notion of quantum confinement leading to fast, green emission from CsPbBr 3 nanostructures embedded in Cs 4 PbBr 6 .

  8. Synthesis and infrared characterization of Br-HBr and Br-DBr entrance channel complexes in solid parahydrogen.

    Science.gov (United States)

    Kettwich, Sharon C; Pinelo, Laura F; Anderson, David T

    2008-09-28

    We report high resolution vibrational spectra in the HBr (2560 cm(-1)) and DBr (1840 cm(-1)) stretching regions for Br-HBr and Br-DBr entrance channel complexes isolated in solid parahydrogen (pH2). The Br-HBr complexes are generated by synthesizing solid pH2 crystals doped with trace amounts of HBr/Br2 mixtures followed by 355 nm in situ photodissociation of Br2 to form Br atoms. After photolysis is complete, the solid is warmed from 2 to 4.3 K resulting in the irreversible formation of Br-HBr complexes. The large 36.63 cm(-1) HBr monomer-to-complex induced vibrational shift to lower energy measured in these studies is consistent with the linear Br-HBr hydrogen bonded structure predicted from theory. The 0.02 cm(-1) Br-HBr absorption linewidths indicate a 1 ns vibrational excited state lifetime for these entrance channel complexes in solid pH2.

  9. Elimination of nonspecific radioactivity from [{sup 76}Br]bromide in PET study with [{sup 76}Br]bromodeoxyuridine

    Energy Technology Data Exchange (ETDEWEB)

    Li Lu; Bergstroem, Mats E-mail: Mats.Bergstroem@pet.uu.se; Fasth, Karl-Johan; Wu Feng; Eriksson, Barbro; Laangstroem, Bengt

    1999-10-01

    [{sup 76}Br]Bromodeoxyuridine ([{sup 76}Br]BrdU) might allow a determination of proliferation in vivo using positron emission tomography (PET), but only with consideration of organ nonspecific radioactivity constituted by [{sup 76}Br]bromide. A first study assessed the potential of diuretics to eliminate [{sup 76}Br]bromide. [{sup 76}Br]Bromide was injected in the vein of rats and different diuretic combinations were given. Urine was collected and radioactivity measured. Torasemide plus sodium chloride gave better {sup 76}Br elimination than the other diuretics. In a second experiment, rats were given [{sup 76}Br]BrdU. After the radioactivity injection, the rats of the treatment group were given torasemide plus NaCl. At 44 h after the radioactivity injection, the radioactivity concentration and the fraction incorporated into DNA were measured in different organs. Using diuretics, the elimination of [{sup 76}Br]bromide was increased. The radioactivity decreased 30-50% in most of the organs but the highest radioactivity uptake was found in the organs with more active DNA synthesis. This method may facilitate the use of [{sup 76}Br]BrdU as a tracer for DNA synthesis using PET.

  10. Magnetostriction and thermal expansion of high T c magnetic superconductors REBa 2Cu 3O 7- x ( RE = Eu, Sm, Gd, Dy, Ho, Er, TmandY) Gd, Dy, Ho, Er, Tm and Y)

    Science.gov (United States)

    Del Moral, A.; Ibarra, M. R.; Arnaudas, J. I.; Algarabel, P. A.; Marquina, C.; Morán, E.; Alario, M. A.

    1988-12-01

    Thermal expansion and magnetostriction measurements for REBa 2Cu 3O 7 -x superconductors are reported, up to 2.4 T and down to 3.8 K. Anisotropic striction is negligible, except for Dy and Ho compounds where is of single-ion origin. Volume striction displays similar order of magnitude and thermal variation, and it is weak (except for Dy compound) pointing to a "host" diamagnetic lattice origin.

  11. Blue-yellow photoluminescence from Ce{sup 3+} {yields} Dy{sup 3+} energy transfer in HfO{sub 2}:Ce{sup 3+}:Dy{sup 3+} films deposited by ultrasonic spray pyrolysis

    Energy Technology Data Exchange (ETDEWEB)

    Martinez-Martinez, R. [Instituto de Fisica y Matematicas, Universidad Tecnologica de la Mixteca, Carretera a Acatlima Km. 2.5, Huajuapan de Leon, Oaxaca 69000 (Mexico); Lira, A.C. [Unidad Academica Profesional Nezahualcoyotl, Universidad Autonoma del Estado de Mexico, Av. Bordo de Xochiaca s/n, Nezahualcoyotl, Estado de Mexico 57000 (Mexico); Speghini, A. [DiSTeMeV, Universita di Verona, and INSTM, UdR Verona, Via Della Pieve 70, I-37029 San Floriano (Verona) (Italy); Falcony, C. [Departamento de Fisica, Universidad Autonoma Metropolitana-Iztapalapa, P.O. Box 55-534, Mexico, D.F. 09340 (Mexico); Caldino, U., E-mail: cald@xanum.uam.mx [Departamento de Fisica, Universidad Autonoma Metropolitana-Iztapalapa, P.O. Box 55-534, Mexico, D.F. 09340 (Mexico)

    2011-02-10

    Research highlights: > A blue-yellow emission phosphor excited with UV radiation can be manufactured with CeCl{sub 3} and DyCl{sub 3} doped HfO{sub 2} films deposited at 300 deg. C by the ultrasonic spray pyrolysis technique. > The addition of DyCl{sub 3} in the HfO{sub 2}:CeCl{sub 3} film leads to a non-radiative energy transfer from Ce{sup 3+} to Dy{sup 3+} under Ce{sup 3+} excitation at 280 nm. > The efficiency of this transfer increases up to 86 {+-} 3% for the film with the highest Dy{sup 3+} content. > The possibility of achieving the coordinates of ideal white light with increasing the concentration of dysprosium is demonstrated. - Abstract: HfO{sub 2} films codoped with Ce{sup 3+} and several concentrations of Dy{sup 3+} have been processed by the ultrasonic spray pyrolysis technique. Emissions from Dy{sup 3+} ions centred at 480 and 575 nm associated with the {sup 4}F{sub 9/2} {yields} {sup 6}H{sub 15/2} and {sup 4}F{sub 9/2} {yields} {sup 6}H{sub 13/2} transitions, respectively, have been observed upon UV excitation via a non-radiative energy transfer from Ce{sup 3+} to Dy{sup 3+} ions. Such energy transfer via an electric dipole-quadrupole interaction appears to be the most probable transfer mechanism. The efficiency of this transfer increases up to 86 {+-} 3% for the film with the highest Dy{sup 3+} content (1.9 {+-} 0.1 at.% as measured from EDS). The possibility of achieving the coordinates of ideal white light with increasing the concentration of dysprosium is demonstrated.

  12. On the evolution of Dipodium R. Br.

    Directory of Open Access Journals (Sweden)

    Peter O'byrne

    2014-12-01

    Full Text Available Dipodium R. Br. (Orchidaceae, a genus of ca. 38 species, should be divided into an Australasian clade and a Malesian clade, based on morphological and geographic evidences. Dipodium section Dipodium and section Leopardanthus (Blume O. Kuntze are re-defined to accommodate this change. An evolutionary scenario that explains this division is proposed. The lack of diversity of floral structure in the genus is probably caused by pollinator-specificity, while the diversity of plant form may be due to long-term environmental factors. An evolutionary explanation is suggested for the complex between Dipodium fevrellii J. J. Sm. and the hybrid D. pandanum Bailey in New Guinea. The complex in Java involving          D. pictum (Lindl. Rchb. f. and D. scandens (Bl. J. J. Sm. is discussed, and the presence of a hybrid noted. In Borneo, the complex taxonomic situation caused by repeated inter-breeding of populations is noted. 

  13. A novel yellowish white Dy3+ activated α-Al2O3 phosphor: Photoluminescence and optical studies

    Science.gov (United States)

    Kumar, Sandeep; Prakash, Ram; Kumar, Vinay

    2015-05-01

    Trivalent Dy doped α-Al2O3 phosphor was synthesized by low temperature solution combustion method using urea as fuel. The phosphor was well characterized by X-ray diffraction (XRD), photoluminescence (PL) spectroscopy and diffused reflectance spectroscopy (DRS). XRD study confirmed the hexagonal structure of Dy3+ doped α-Al2O3 as prepared phosphor. Under various ultraviolet (UV) excitations (353 nm, 367 nm and 325 nm), α-Al2O3:Dy3+ phosphor exhibits the characteristic emission bands centered at 490 nm, 589 nm and 670 nm, resulting from the 4F9/2-6HJ/2 (J = 15, 13, 11) transitions of Dy3+, respectively. The observed CIE coordinates (x, y) as (0.373, 0.379) corresponds to the shade of yellowish white in color gamut. The bandgap was calculated using diffused reflectance (DR) spectrum and it was estimated around 5.9 eV.

  14. Comparison of the Solid Solution Properties of Mg-RE (Gd, Dy, Y Alloys with Atomistic Simulation

    Directory of Open Access Journals (Sweden)

    Yurong Wu

    2008-01-01

    Full Text Available Molecular dynamic simulations have been performed to study the solid solution mechanism of Mg100-xREx (RE=Gd,Dy,Y, x=0.5,1,2,3,4  at.%. The obtained results reveal that the additions of Gd, Dy and Y increase the lattice constants of Mg-RE alloys. Also the axis ratio c/a remains unchanged with increase in temperature, restraining the occurrence of nonbasal slip and twinning. Furthermore, it is confirmed that bulk modulus of Mg alloys can be increased remarkably by adding the Gd, Dy, Y, especially Gd, because the solid solubility of Gd in Mg decrease sharply with temperature in comparison with Dy and Y. Consequently, the addition of the RE can enhance the strength of Mg-based alloys, which is in agreement with the experimental results.

  15. Thermoluminescent response of CaSO{sub 4}: Dy + PTFE to beta particles; Respuesta termoluminiscente de CaSO{sub 4}: Dy + PTFE a particulas beta

    Energy Technology Data Exchange (ETDEWEB)

    Aguirre C, A.; Azorin N, J. [Colegio de Bachilleres No. 13, Xochimilco-Tepepan, 16000 Mexico D.F. (Mexico)

    2000-07-01

    In this work the results of studying the thermoluminescent properties of CaSO{sub 4}: Dy + PTFE are presented when it is irradiated with beta particles. The conclusion was the obtention of the Tl response curve in function of dose is that to desexcite the dosemeters at temperature 300 C during 30 minutes and after that were irradiated at different times in groups and to do the reading of dosemeter, it can be observed that a greater irradiation time major is the Tl response and this depends of the material has been used. (Author)

  16. Inhibition of tumor angiogenesis by Brahma Rasayana (BR).

    Science.gov (United States)

    Thangapazham, Rajesh L; Sharma, Anuj; Gaddipati, Jaya P; Singh, Anoop K; Maheshwari, Radha K

    2006-01-01

    The current therapy for prostate cancer includes radical prostatectomy, radiation therapy and hormonal ablation. Chemotherapy also provides beneficial results for some patients with advanced prostate cancer but with several harmful side effects. Hence there is a need to identify and develop alternate therapies, which can reduce the disease progression with minimal or few side effects. Earlier studies from our laboratory have shown that a Polyherbal mixture, Brahma Rasayna (BR) rich in anti-oxidant principles has a potential to be an anti-tumor agent. BR treatment of MAT-LyLu cell inoculated Copenhagen rats resulted in a decrease of palpable tumor incidence, delay in tumor occurrence and lower mean tumor volumes. Also, a significant reduction in tumor weight and lung metastasis was observed in BR treated animals in comparison to untreated controls. In the present study, we focused to examine the effect of BR on angiogenesis and regulation of molecular markers involved in angiogenesis using in-vivo and in-vitro models. BR treatment showed a significant reduction in Factor VIII expression compared to control indicating reduced angiogenesis. BR treated tumor specimens showed a decrease in the pro-angiogenic factors like VEGF, MMP-9 and MMP-2. Methanolic extract of BR was found to inhibit the proliferation, tube formation, cell migration and attachment of HUVEC on matrigel in a dose dependant manner. These findings suggest the possible mechanism(s) of action of BR in the reduction of tumor growth and metastatic spread.

  17. Production and validation of model iron-tannate dyed textiles for use as historic textile substitutes in stabilisation treatment studies

    Directory of Open Access Journals (Sweden)

    Wilson Helen

    2012-05-01

    Full Text Available Abstract Background For millennia, iron-tannate dyes have been used to colour ceremonial and domestic objects shades of black, grey, or brown. Surviving iron-tannate dyed objects are part of our cultural heritage but their existence is threatened by the dye itself which can accelerate oxidation and acid hydrolysis of the substrate. This causes many iron-tannate dyed textiles to discolour and decrease in tensile strength and flexibility at a faster rate than equivalent undyed textiles. The current lack of suitable stabilisation treatments means that many historic iron-tannate dyed objects are rapidly crumbling to dust with the knowledge and value they hold being lost forever. This paper describes the production, characterisation, and validation of model iron-tannate dyed textiles as substitutes for historic iron-tannate dyed textiles in the development of stabilisation treatments. Spectrophotometry, surface pH, tensile testing, SEM-EDX, and XRF have been used to characterise the model textiles. Results On application to textiles, the model dyes imparted mid to dark blue-grey colouration, an immediate tensile strength loss of the textiles and an increase in surface acidity. The dyes introduced significant quantities of iron into the textiles which was distributed in the exterior and interior of the cotton, abaca, and silk fibres but only in the exterior of the wool fibres. As seen with historic iron-tannate dyed objects, the dyed cotton, abaca, and silk textiles lost tensile strength faster and more significantly than undyed equivalents during accelerated thermal ageing and all of the dyed model textiles, most notably the cotton, discoloured more than the undyed equivalents on ageing. Conclusions The abaca, cotton, and silk model textiles are judged to be suitable for use as substitutes for cultural heritage materials in the testing of stabilisation treatments.

  18. Production and validation of model iron-tannate dyed textiles for use as historic textile substitutes in stabilisation treatment studies

    Science.gov (United States)

    2012-01-01

    Background For millennia, iron-tannate dyes have been used to colour ceremonial and domestic objects shades of black, grey, or brown. Surviving iron-tannate dyed objects are part of our cultural heritage but their existence is threatened by the dye itself which can accelerate oxidation and acid hydrolysis of the substrate. This causes many iron-tannate dyed textiles to discolour and decrease in tensile strength and flexibility at a faster rate than equivalent undyed textiles. The current lack of suitable stabilisation treatments means that many historic iron-tannate dyed objects are rapidly crumbling to dust with the knowledge and value they hold being lost forever. This paper describes the production, characterisation, and validation of model iron-tannate dyed textiles as substitutes for historic iron-tannate dyed textiles in the development of stabilisation treatments. Spectrophotometry, surface pH, tensile testing, SEM-EDX, and XRF have been used to characterise the model textiles. Results On application to textiles, the model dyes imparted mid to dark blue-grey colouration, an immediate tensile strength loss of the textiles and an increase in surface acidity. The dyes introduced significant quantities of iron into the textiles which was distributed in the exterior and interior of the cotton, abaca, and silk fibres but only in the exterior of the wool fibres. As seen with historic iron-tannate dyed objects, the dyed cotton, abaca, and silk textiles lost tensile strength faster and more significantly than undyed equivalents during accelerated thermal ageing and all of the dyed model textiles, most notably the cotton, discoloured more than the undyed equivalents on ageing. Conclusions The abaca, cotton, and silk model textiles are judged to be suitable for use as substitutes for cultural heritage materials in the testing of stabilisation treatments. PMID:22616934

  19. Corrosion inhibition performance of a ionic liquid surfactant Br

    Directory of Open Access Journals (Sweden)

    Jing LIU

    2016-02-01

    Full Text Available In order to study the novel green organic mercury-substituting inhibitors, the ionic liquid surfactant 1-methyl-3-dodecyl imidazole bromide ( Br is synthesized with N-methyl imidazole and 1-bromodecane as raw materials. The corrosion inhibition of Br for zinc in zinc-manganese batteries is investigated using electrochemical methods and weight loss methods. The results show that corrosion inhibition efficiency increases with the increase of the concentration of Br, and when the concentration is higher than 8×10-3 mol/L, the inhibition efficiency tends to be stable. The polarization curve shows that Br belongs to mixed-type corrosion inhibitor. The thermodynamic parameters show that Br is spontaneously adsorbed on the zinc surface, forming a monomolecular adsorption layer, which fits with Langmuir adsorption isotherm with physical and chemical adsorption mechanism.

  20. Qualidade ambiental urbana do Distrito do Brás, município de São Paulo (SP)

    OpenAIRE

    Julierme Zero Lima Barboza

    2014-01-01

    O presente trabalho teve por objetivo analisar os atributos ambientais: uso do solo, usos potencialmente poluidores, verticalidade das edificações, densidade populacional, deserto florístico, espaços livres públicos e áreas de inundações e pontos de alagamentos, espacializando-os para a definição da qualidade ambiental urbana do distrito do Brás, município de São Paulo (SP). O embasamento teórico da pesquisa foi fundamentada no conceito de paisagem e a metodologia aplicada para atender aos ob...

  1. Physical and electrical characteristics of metal/Dy{sub 2}O{sub 3}/p-GaAs structure

    Energy Technology Data Exchange (ETDEWEB)

    Saghrouni, H., E-mail: hayet_sagrouni@yahoo.fr [Université de Sousse, Laboratoire Energie-Matériaux, Ecole Supérieure des Sciences et de la Technologie, Rue Lamine Abessi, 4011 Hammam Sousse (Tunisia); Université de Sousse, Laboratoire Energie-Matériaux, Groupe de Recherche Nano-Matériaux pour les Télécommunications, Institut Supérieur d’informatique et des Techniques de Communications, Gp1 4011 Hammam Sousse (Tunisia); Jomni, S.; Belgacem, W. [Laboratoire de matériaux, organisation et proprieties, Faculté des Sciences de Tunis, Université de Tunis El Manar (Tunisia); Hamdaoui, N. [Université de Sousse, Laboratoire Energie-Matériaux, Ecole Supérieure des Sciences et de la Technologie, Rue Lamine Abessi, 4011 Hammam Sousse (Tunisia); Beji, L. [Université de Sousse, Laboratoire Energie-Matériaux, Ecole Supérieure des Sciences et de la Technologie, Rue Lamine Abessi, 4011 Hammam Sousse (Tunisia); Université de Sousse, Laboratoire Energie-Matériaux, Groupe de Recherche Nano-Matériaux pour les Télécommunications, Institut Supérieur d’informatique et des Techniques de Communications, Gp1 4011 Hammam Sousse (Tunisia)

    2014-07-01

    This paper describes the effect of post-deposition annealing on the physical and electrical characteristics of high-k Dy{sub 2}O{sub 3} dielectric films deposited at 250 °C on p-GaAs substrate by electron beam deposition under ultra vacuum. The morphological and structural features of Dy{sub 2}O{sub 3} layer before and after postdeposition annealing were studied by atomic force microscopy (AFM) and X-ray diffraction (XRD). The surface topography analysis reveals that the Dy{sub 2}O{sub 3} film is granular, and contains numerous contacts between columnar grains. While investigating the electrical properties Dy{sub 2}O{sub 3} oxide, the current–voltage characteristics I(V) suggest a Poole–Frenkel (PF) type mechanism of carrier transport for as-deposited and annealed layers. A deviation from the PF leakage current course was found and attributed to the current carrier trapping. The ac impedance properties of the structures have been studied in a wide frequency range at different bias voltage. The Dy{sub 2}O{sub 3} annealed exhibited excellent electrical properties such as small density of interface state and low leakage current. This phenomenon is attributed to a rather crystallized Dy{sub 2}O{sub 3} structure and the reduction of the defects at the oxide/GaAs interface.

  2. Optical thermometry based on luminescence behavior of Dy{sup 3+}-doped transparent LaF{sub 3} glass ceramics

    Energy Technology Data Exchange (ETDEWEB)

    Bu, Y.Y. [Nanjing University of Posts and Telecommunications, College of Electronic Science and Engineering, Nanjing (China); Nanjing University of Posts and Telecommunications, College of Science, Nanjing (China); Cheng, S.J.; Wang, X.F. [Nanjing University of Posts and Telecommunications, College of Electronic Science and Engineering, Nanjing (China); Key Laboratory of Radio Frequency and Micro-Nano Electronics of Jiangsu Province, Nanjing, Jiangsu (China); Yan, X.H. [Nanjing University of Posts and Telecommunications, College of Electronic Science and Engineering, Nanjing (China); Key Laboratory of Radio Frequency and Micro-Nano Electronics of Jiangsu Province, Nanjing, Jiangsu (China); Nanjing University of Aeronautics and Astronautics, College of Science, Nanjing (China)

    2015-11-15

    Dy{sup 3+}-doped transparent LaF{sub 3} glass ceramics were fabricated, and its structures of resulting glass ceramics are studied by the X-ray diffraction and transmission electron microscopy. Optical temperature sensing of the resulting glass ceramics in the temperature range from 298 to 523 K is studied based on the down-conversion luminescence of Dy{sup 3+} ion. By using fluorescence intensity ratio method, the {sup 4}I{sub 15/2} and {sup 4}F{sub 9/2} of Dy{sup 3+} ions are verified as thermally coupled levels. A minimum S{sub R} = 1.16 x 10{sup -4} K{sup -1} is obtained at T = 294 K. By doping Eu{sup 3+} ion, the overall emission color of Eu{sup 3+}-Dy{sup 3+} co-doped transparent glass ceramics can be tuned from white to yellow with the temperature increase through energy transfer between Eu{sup 3+} and Dy{sup 3+}. Additionally, the thermal stability of the Dy{sup 3+} single-doped transparent glass ceramics becomes higher after doping Eu{sup 3+} ion. (orig.)

  3. Thermoelectric properties of Ca0.8Dy0.2MnO3 synthesized by solution combustion process

    Directory of Open Access Journals (Sweden)

    Park Kyeongsoon

    2011-01-01

    Full Text Available Abstract High-quality Ca0.8Dy0.2MnO3 nano-powders were synthesized by the solution combustion process. The size of the synthesized Ca0.8Dy0.2MnO3 powders was approximately 23 nm. The green pellets were sintered at 1150-1300°C at a step size of 50°C. Sintered Ca0.8Dy0.2MnO3 bodies crystallized in the perovskite structure with an orthorhombic symmetry. The sintering temperature did not affect the Seebeck coefficient, but significantly affected the electrical conductivity. The electrical conductivity of Ca0.8Dy0.2MnO3 increased with increasing temperature, indicating a semiconducting behavior. The absolute value of the Seebeck coefficient gradually increased with an increase in temperature. The highest power factor (3.7 × 10-5 Wm-1 K-2 at 800°C was obtained for Ca0.8Dy0.2MnO3 sintered at 1,250°C. In this study, we investigated the microstructure and thermoelectric properties of Ca0.8Dy0.2MnO3, depending on sintering temperature.

  4. Structure, morphology and optical characterization of Dy3+-doped BaYF5 nanocrystals for warm white light emitting devices

    Science.gov (United States)

    Haritha, P.; Martín, I. R.; Dwaraka Viswanath, C. S.; Vijaya, N.; Venkata Krishnaiah, K.; Jayasankar, C. K.; Haranath, D.; Lavín, V.; Venkatramu, V.

    2017-08-01

    The barium yttrium fluoride BaYF5 nanocrystalline powders doped with different concentrations of Dy3+ ions have been synthesized via a hydrothermal method and studied their structural, morphological, thermal, vibrational, and optical properties. These nanopowders have been crystallized in a single phase of the tetragonal structure with the average size of around 30 nm having spherical shape in morphology. Upon excitations at 350 and 387 nm, Dy3+ -doped BaYF5 nanocrystals exhibit strong blue and yellow emissions ascribed to the 4F9/2 → 6H15/2 and 4F9/2 → 6H13/2 transitions, respectively. Decay curves of the 4F9/2 level of Dy3+ ion in BaYF5 nanocrystals exhibit non-exponential nature due to the dipole-dipole interaction between Dy3+ ions, confirmed by Inokuti-Hirayama model. The quantum yield for these nanocrystals have been found to be increased from 4.64% to 11.61% as the concentration of Dy3+ ions increases from 1.0 mol% to 2.0 mol% and then decreased to 10.68% as the dopant concentration increased to 5.0 mol%. Moreover, color coordinates and correlated color temperatures have been evaluated as a function of concentration and excitation wavelength and found to be in the warm white light region for all Dy3+ concentrations.

  5. Thermoluminescent response of CaSO{sub 4}:Dy+PTFE induced by X-ray beams

    Energy Technology Data Exchange (ETDEWEB)

    Hernandez, L. [Centro de Investigacion en Ciencia Aplicada y Tecnologia Avanzada-Legaria, IPN. Av. Legaria 694 C.P. 11500 Mexico D.F. (Mexico); Rivera, T., E-mail: trivera@ipn.mx [Centro de Investigacion en Ciencia Aplicada y Tecnologia Avanzada-Legaria, IPN. Av. Legaria 694 C.P. 11500 Mexico D.F. (Mexico); Jimenez, Y.; Alvarez, R.; Zeferino, J.; Vazquez, A. [Centro de Investigacion en Ciencia Aplicada y Tecnologia Avanzada-Legaria, IPN. Av. Legaria 694 C.P. 11500 Mexico D.F. (Mexico); Azorin, J. [Universidad Autonoma Metropolitana-Iztapalapa. Av. San Rafael Atlixco 186, C.P. 09340 Mexico D.F. (Mexico)

    2012-07-15

    The aim of the present work was to evaluate the feasibility of the utilization of CaSO{sub 4}:Dy pellets for X-ray measurements in a general radiology department. Thermoluminescence (TL) response of CaSO{sub 4}:Dy+PTFE was compared to the TL response of commercial LiF:Mg,Ti (TLD-100) samples. TL pellets were exposed to X-ray beam from X-ray machine CMR for clinical diagnosis purpose. The calibration curve of CaSO{sub 4}:Dy+PTFE was obtained and it showed a linear response as a function of absorbed dose in air at the studied dose interval. Despite this fact, this material can be used for X-ray beams measurements if appropriate calibration procedures are performed. - Highlights: Black-Right-Pointing-Pointer Developing of CaSO{sub 4}:Dy to quasimono-energetic X-ray low energy dosimetry. Black-Right-Pointing-Pointer Thermoluminescent response of caSO{sub 4}:Dy to X-ray low dose. Black-Right-Pointing-Pointer TL characteristics of CaSO{sub 4}:Dy for X-ray beam quality control.

  6. Physicochemical characterization of thermally aged Egyptian linen dyed with organic natural dyestuffs

    Science.gov (United States)

    Kourkoumelis, N.; El-Gaoudy, H.; Varella, E.; Kovala-Demertzi, D.

    2013-08-01

    A number of organic natural dyestuffs used in dyeing in ancient times, i.e. indigo, madder, turmeric, henna, cochineal, saffron and safflower, have been used to colour Egyptian fabrics based on linen. Their physicochemical properties have been evaluated on thermally aged linen samples. The aged dyed linen samples were thoroughly examined by Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), X-ray diffraction (XRD) and tensile strength and elongation measurements. It was found that, in the molecular level, dyes interact mainly with the cellulose compounds of the aged linen while in the macroscopic level tensile and elongation parameters are altered. Tensile strength is positively related to the dye treatment while elongation depends specifically on the type of the dye used. Results converge that the dyed textiles did indeed play a role as protecting agents affecting strength and reducing thermal deterioration.

  7. Preliminary study on the correlation between color measurement of dyed polyester and its image files

    Science.gov (United States)

    Park, Y. K.; Park, Y. C.

    2017-10-01

    As the internet becomes more popular, buyers send image files to manufacturers instead of sending swatches. However, this method may cause problems because different from the monitor between the buyer and the manufacturer, and also there is a problem depending on the light source. In order to overcome these problems, we investigated the relationship between color measurement values of dyed fabrics and RGB values of image files. The RGB values of image files tended to decrease with increasing dye concentration in all three colors. Correlation between RGB values and a*, b* values was observed at low concentration, but there was little correlation at high concentration. In the case of yellow color, there is no correlation between the L*a*b* values obtained from the dyed fabric and RGB values obtained from the image file.

  8. Spin relaxation in antiferromagnetic Fe–Fe dimers slowed down by anisotropic DyIII ions

    Directory of Open Access Journals (Sweden)

    Valeriu Mereacre

    2013-11-01

    Full Text Available By using Mössbauer spectroscopy in combination with susceptibility measurements it was possible to identify the supertransferred hyperfine field through the oxygen bridges between DyIII and FeIII in a {Fe4Dy2} coordination cluster. The presence of the dysprosium ions provides enough magnetic anisotropy to “block” the hyperfine field that is experienced by the iron nuclei. This has resulted in magnetic spectra with internal hyperfine fields of the iron nuclei of about 23 T. The set of data permitted us to conclude that the direction of the anisotropy in lanthanide nanosize molecular clusters is associated with the single ion and crystal field contributions and 57Fe Mössbauer spectroscopy may be informative with regard to the the anisotropy not only of the studied isotope, but also of elements interacting with this isotope.

  9. Vacancy mediated room temperature ferromagnetism in Co-doped Dy2O3

    Science.gov (United States)

    Bandyopadhyay, A.; Sutradhar, S.; Sarkar, B. J.; Deb, A. K.; Chakrabarti, P. K.

    2012-06-01

    Nanoparticles of Co doped dysprosium oxide [Dy1.90Co0.10O3] were prepared by co-precipitating the precursor salts in presence of air and argon gas. Crystallographic phase and substitution of Co-ion in Dy2O3 were confirmed by Rietveld analysis of the x-ray diffraction patterns. Magnetic susceptibility and magnetization as a function of temperature and magnetic field were measured by Faraday and Superconducting quantum inteference device (SQUID) magnetometers, which showed that the sample synthesized in the inert atmosphere is ferromagnetic at room temperature. But no such effect has been observed in the other sample. This observation confirmed that vacancy mediated ferromagnetism can be introduced in the Co-doped dysprosium oxide.

  10. Entropy in hot $^{161,162}Dy$ and $^{171,172}Yb$ nuclei

    CERN Document Server

    Guttormsen, M; Hjorth-Jensen, M; Melby, E; Rekstad, J; Schiller, A; Siem, S; Belic, A

    2000-01-01

    The density of accessible levels at low spin in the (^3He,\\alpha \\gamma) reaction has been extracted for the ^{161,162}Dy and ^{171,172}Yb nuclei. The entropy of the even-odd and even-even nuclei has been deduced as a function of excitation energy, and found to reach a maximum of 15 k_B before neutron evaporation. The entropy of one quasi-particle outside an even-even core is found to be 1.70(15) k_B. This quasi-particle picture of hot nuclei is well accounted for within a simple pairing model. The onset of two, four and six quasi-particle excitations in the ^{162}Dy and ^{172}Yb nuclei is discussed and compared to theory. The number of quasi-particles excited per excitation energy is a measure for the ratio of the level energy spacing and the pairing strength.

  11. Growth and magneto-optical characteristic of Dy2Ti2O7 crystal

    Science.gov (United States)

    Kang, Junbiao; Ruan, Min; Chen, Xiang; Liu, Chenbin; Liu, Wei; Guo, Feiyun; Chen, Jianzhong

    2014-05-01

    A pyrochlore crystal with magneto-optical effect - Dy2Ti2O7 crystal with 19-20 mm in diameter and 21 mm in length has been grown by the Czochralski method. The lattice parameters were calculated by X-ray powder diffraction, which revealed that the crystal belongs to cubic system. Absorption spectrum was measured in the visible and near-infrared region at room temperature, which indicated the crystal has low absorption coefficient at 600-760 nm. The specific Faraday rotation of single crystal was measured at room temperature in 532, 633, and 1064 nm. The Verdet constant of Dy2Ti2O7 crystal at 633 nm comes up to -183 rad/(m T), which is as 1.4 times as that of TGG reported.

  12. Preparation and Properties of Nano Dy/TiO2 Films Supported on High Silica Fiber

    Directory of Open Access Journals (Sweden)

    HUANG Feng-ping

    2017-07-01

    Full Text Available In order to improve the photocatalytic degradation performance and stability of nano TiO2, Dy doped TiO2 supported on high silica glass fiber was prepared by microwave-sol method combined with dip-coating method. The samples were analyzed by XRD,SEM,PL,EDS,XPS and other equipments for phase composition of films,surface topography, surface elements and the stability of films. And the effects of pretreatment solution and coating method on the high-silica fiber film were investigated.In addition, the photocatalytic performance of the sample has been investigated by degrading methylene blue. The results show that the catalytic stability of Dy doping TiO2 nanofilms supported on high silica glass fiber can be improved and the degradation of methyl orange can reach 94% in 30min after 5 times of coating treatment.

  13. [Transluminal esophagoplasty (TE)].

    Science.gov (United States)

    Simonetti, G; Meloni, G B; Urigo, F; Canalis, G C; Tomiselli, A; Trignano, M; Bresadola, F

    1985-10-01

    The authors analyze their experience on 9 cases of esophageal stenosis dilated by "Grüntzig" type balloon catheter under fluoroscopic examination (transluminal esophagus plastica: TE). This procedure also allows dilatation of severe narrowing, offering distinct advantages represented by: low risk, easy performance, good tolerance, reduction or disappearance of disphagia. Esophageal perforation is possible, though it never appeared in author's experience.

  14. Effect of swift heavy ion irradiation on surface resistance of DyBa 2 ...

    Indian Academy of Sciences (India)

    Home; Journals; Pramana – Journal of Physics; Volume 58; Issue 5-6. Effect of swift heavy ion irradiation on surface resistance of DyBa2Cu3O7- thin films at microwave frequencies. Ujwala Ail Tamalika Banerjee A R Bhangale D Kanjilal R Pinto. Physics of Vortex State Volume 58 Issue 5-6 May-June 2002 pp 959-963 ...

  15. Synthesis of CaF{sub 2}: dy for thermoluminescent dosimetry

    Energy Technology Data Exchange (ETDEWEB)

    Yamato, M.E.P.; Vasconcelos, D.A.A. de; Asfora, V.K.; Khoury, H.J.; Santos, R.A.; Barros, V.S.M., E-mail: mepyamato@gmail.com [Universidade Federal de Pernambuco (UFPE), Recife, PE (Brazil). Departamento de Energia Nuclear

    2015-07-01

    Calcium Fluoride doped with dysprosium is a known thermoluminescent material for applications that require highly sensitive dosimeters. Research in novel methods such as Combustion Synthesis (CS) has been ongoing for several years at the University of Pernambuco. The method uses the heat of the oxi-redox reaction a between nitrate and a fuel. This work presents results of CaF{sub 2}:Dy produced by combustion synthesis under different fabrication conditions. Samples were prepared by mixing stoichiometric amounts of calcium nitrate, urea and ammonium nitrate in a beaker under vigorous stirring. The resulting gel was transferred to a pre-heated muffle furnace were the combustion reaction occurred after a few minutes. For comparison, a variation of the production method with the same amounts of nitrate, ammonium fluoride and dopant, but without using the fuel was prepared. For both methods the resulting powder was pelleted and irradiated with Co-60 gamma radiation. The reproducibility and sensitivity for gamma dose irradiation was tested and results showed that optimum TL sample reproducibility was without the urea as fuel. Samples were then prepared with 0.05, 0.10, 0.15 and 0.20 mol% Dy concentration. The highest TL sensitivity was found for samples with 0.15 mol% Dy and sintered at 400 deg C for 3.5 h in air. The TL emission spectra, obtained using a Hammamatsu optical spectrometer, was comparable with commercial CaF{sub 2}:Dy. Thermoluminescence was measured in a Harshaw-Bicron 3500 TL Reader. The glow curve showed stable dosimetric peaks at around 200, 235 and 300 deg C were a linear dose response curve was obtained for the range 100 mGy to 1000 mGy. (author)

  16. Structural and optical characteristics of Ce, Nd, Gd, and Dy-doped ...

    Indian Academy of Sciences (India)

    2017-06-19

    Jun 19, 2017 ... Aluminum oxide films doped with RE elements such as Ce, Nd, Gd, and Dy are synthesized on glass substrate using ultrasonic spray pyrolysis technique at 400 ∘ C. The concentration of rare earth element is varied from 0.5 to 5 mol% in 0.1 M solution of A l 2 O 3 . The X-ray diffraction analysis indicates that ...

  17. Combustion synthesis of Eu 2 and Dy 3 activated Sr3 (VO4) 2 ...

    Indian Academy of Sciences (India)

    The excitation wavelength of Eu (342 nm) and Dy (426 nm) activated Sr3(VO4)2 phosphor are well matched with the excitation of near UV excited solid state lighting and blue chip excitation of light emitting diodes, respectively. The effect of Eu2+ and Eu3+ ions concentration on the emission intensity of Sr3(VO4)2 was also ...

  18. Primes of the form x2 + dy2 with x ≡ 0(mod N)

    Indian Academy of Sciences (India)

    which states that, for p > 2, p = x2 + y2 ⇔ p ≡ 1(mod 4). This led many mathematicians to work on primes of the form x2 + dy2 for d = 2, 3, 5, 7 and so on. Cox [6] solved this problem using the techniques from class field theory. Cox's result is as follows: let n be a positive integer, p an odd prime relatively prime to d and.

  19. Brändikäsikirjan toteutus Yritys X:n brändin rakentamisen tueksi

    OpenAIRE

    Ahokas, Riikka

    2017-01-01

    Tämän opinnäytetyön tavoitteena oli luoda toimeksiantajayritykselle yhdenmukainen ja kilpailijoista erottuva brändi. Tarkoituksena oli siis selvittää, minkälainen brändi kuvaa yritystä parhaiten sekä eroaa riittävästi yrityksen kilpailijoista. Tämän lisäksi selvitettiin, millainen on hyvä brändikäsikirja. Toimeksiantajayrityksen on tarkoitus käyttää brändikäsikirjaa henkilöstönsä perehdytyksessä. Teoreettisessa viitekehyksessä käsitellään brändiä, sen tärkeimpiä tehtäviä sekä sen merkitys...

  20. Thermoluminescence in films of HfO{sub 2}:Dy{sup +3}; Termoluminiscencia en peliculas de HfO{sub 2}:Dy{sup +3}

    Energy Technology Data Exchange (ETDEWEB)

    Ceron, P.; Rivera, T.; Guzman, J.; Montes, E.; Pelaez, A.; Rojas, B.; Guzman, D. [IPN, Centro de Investigacion en Ciencia Aplicada y Tecnologia Avanzada, Legaria No. 694, Col. Irrigacion, 11500 Mexico D. F. (Mexico); Azorin, J. [Universidad Autonoma Metropolitana, Unidad Iztapalapa, San Rafael Atlixco 186, Col. Vicentina, 09340 Mexico D. F. (Mexico); Paredes, L., E-mail: victceronr@hotmail.com [ININ, Carretera Mexico-Toluca s/n, 52750 Ocoyoacac, Estado de Mexico (Mexico)

    2014-08-15

    In this work the thermoluminescence (TL) response of films of hafnium oxide polluted with dysprosium (HfO{sub 2}:Dy{sup +3}) that were irradiated in the near UV (200 nm - 400 nm). The films were deposited by means of the ultrasonics spray pyrolysis technique on a glass substrate, using different deposit temperatures (300 grades C - 600 grades C). The best TL emission corresponded to the prepared film to 450 grades C that was exposed to a spectral irradiation of 80 μJ/(cm{sup 2}-s) with a wave longitude of 240 nm. The TL response in function of the spectral irradiation was lineal in the studied interval (24 to 288 mJ/cm{sup 2}), several kinetic parameters were also calculated of the shine curve as depth of the trap (E), frequency factor (s) and order to the kinetics (b). The obtained results show that the films of HfO{sub 2}:Dy{sup +3} could be used as radiation monitor in the region of the near UV. (Author)

  1. Yarn-dyed fabric defect classification based on convolutional neural network

    Science.gov (United States)

    Jing, Junfeng; Dong, Amei; Li, Pengfei; Zhang, Kaibing

    2017-09-01

    Considering that manual inspection of the yarn-dyed fabric can be time consuming and inefficient, we propose a yarn-dyed fabric defect classification method by using a convolutional neural network (CNN) based on a modified AlexNet. CNN shows powerful ability in performing feature extraction and fusion by simulating the learning mechanism of human brain. The local response normalization layers in AlexNet are replaced by the batch normalization layers, which can enhance both the computational efficiency and classification accuracy. In the training process of the network, the characteristics of the defect are extracted step by step and the essential features of the image can be obtained from the fusion of the edge details with several convolution operations. Then the max-pooling layers, the dropout layers, and the fully connected layers are employed in the classification model to reduce the computation cost and extract more precise features of the defective fabric. Finally, the results of the defect classification are predicted by the softmax function. The experimental results show promising performance with an acceptable average classification rate and strong robustness on yarn-dyed fabric defect classification.

  2. Discrimination of reactively-dyed cotton fibres with thin layer chromatography and UV microspectrophotometry.

    Science.gov (United States)

    De Wael, K; Van Dijck, K; Gason, F

    2015-12-01

    Reactively-dyed black, navy blue and medium red cotton samples showing metamerism under fluorescent tube illumination were examined. Optical microscopy (bright field, polarization and fluorescence microscopy) was used, followed by microspectrometry in the visible range (MSP Vis), to differentiate the samples in each block of colours. Additionally, the non-discriminated samples were subjected both to microspectrophotometry in the UV-range (MSP UV) and to enzymatic digestion followed by high performance thin layer chromatography (HPTLC) on the digests. While it was found that both methods may potentially result in higher discrimination, preparation of reactively-dyed cotton for HPTLC was found to be a very tedious and time-consuming step and HPTLC only led to a better discrimination than MSP UV for the red cotton samples. The results suggest that in order to increase the discrimination for reactively-dyed cotton fibres, measurement of the UV absorption spectrum (MSP UV) is preferred over HPTLC. Copyright © 2015 The Chartered Society of Forensic Sciences. Published by Elsevier Ireland Ltd. All rights reserved.

  3. Measurement of neutron total cross-sections for {sup nat}Dy at Pohang Neutron Facility

    Energy Technology Data Exchange (ETDEWEB)

    Shin, S. G.; Kye, Y. U.; Shvetsov, Valery; Cho, M. H. [POSTECH, Pohang (Korea, Republic of); Namkung, W.; Cho, M. H. [Pohang Accelerator Laboratory, Pohang (Korea, Republic of); Kim, G. N. [Kyungpook National Univ., Daegu (Korea, Republic of); Lee, M. W. [Dongnam Inst. of radiological and Medical Science, Busan (Korea, Republic of)

    2013-05-15

    There are few measurements for Dy below 100 eV. Moreover, there exist discrepancies among the measurements. In the present work, the total neutron cross-sections for {sup nat}Dy were measured by using the time-of-flight (TOF) method at the Pohang Neutron Facility (PNF). The PNF consists of an electron linac, a water-cooled Ta target, and an 11-m-long TOF path. The characteristics of PNF are described elsewhere. We also briefly discuss the future plan to verify our experimental result. We have measured the total neutron cross-sections of {sup nat}Dy in the neutron energy region from 0.1 eV to 100 eV with the TOF method at the Po hang Neutron Facility. The present result is in good agreement with the previous data and the evaluated data in ENDF/B-VI. We would like to get resonance parameters by using SAMMY or REFIT codes.

  4. Effect of Rare Earth Elements Burning Loss on Microstructure and Properties in TbDyFe

    Directory of Open Access Journals (Sweden)

    DENG Zhong-hua

    2016-08-01

    Full Text Available In order to simulate low vacuum experimental environment,Tb0.27Dy0.73Fe1.91 alloy round bars were prepared through melting with Tb, Dy and Fe elements, directional solidification and heat treatment in low vacuum environment. The magnetostriction of the alloy rods was tested. The microstructures and the causes of defects in the alloy were investigated. The results indicate that under the low vacuum experimental environment, there are plenty of twin dendritic lamellar microstructures and ordinary twin microstructures are generated in alloy, among which the mechanical properties and "jump" effect of twin dendritic lamellar structures are good, while the ordinary twins are bad to the magnetostrictive property in the alloy. REFe2 and REFe3 coupling phase is the main phase in the matrix, the burning loss of rare earth elements lead variations in chemical composition, resulting coupling growth with REFe3 phase and REFe2 phase. The thermal stress and the burning loss of rare earth elements segregate at grain boundaries resulting in the presence of micro-cracks and micro-holes. These microstructures and defects generate bad impact on mechanical properties and magnetostriction of TbDyFe alloy rods.

  5. Thermoluminescent properties of Dy doped calcium borate based glass for dose measurement subjected to photon irradiation

    Directory of Open Access Journals (Sweden)

    Tajuddin H. A.

    2017-01-01

    Full Text Available This study presents the thermoluminescent (TL dosimetric properties of calcium borate glass with various dopant concentration of dysprosium (Dy. Calcium borate glass is a new potential material to be used in radiation measurement with absorption coefficient that is close to human bone. A series of glasses based on chemical equation xCaO-(100-x B2O3 system, x = 0.1, 0.2, 0.3, 0.4, 0.5 (0< x <100 % weight have been prepared by melt quenching method. The X-ray diffraction analysis of glass samples were carried out and the result showed a broad peak, which confirmed the amorphous nature of the glass. The 70B2O3-30CaO glass sample was found as the most stable among other glass samples studied. Present work focuses on 70B2O3-30CaO glass of (0.01-0.4 mol% Dy-doped in order to investigate the thermoluminescence (TL properties, in particular, dose-response and fading. The glass samples were irradiated to dose range of 0.5-4.0 Gy subjected to 6MV photon irradiations of LINAC Primus MLC 3339. TL response of 0.3 mol% Dy-doped 70B2O3-30CaO glass was found to produce highest response, with good linear dose- response relationship.

  6. Calculation of thermodynamic functions of saturated solid solution of AgIn2Te3I compound in the Ag-In-Te-I system

    Science.gov (United States)

    Moroz, Mykola; Prokhorenko, Sergiy; Prokhorenko, Myroslava; Reshetnyak, Oleksandr

    2017-01-01

    Triangulation of Ag-In-Te-I system in the vicinity of AgIn2Te3I compound was investigated by X-ray diffraction and differential thermal analysis methods. The spatial position of the phase region AgIn2Te3I-InTe-Ag2Te-AgI regarding the figurative point of silver was used in order to write the equation of virtual potential-forming reaction. Potential-forming reaction was performed in electrochemical cell (ECC) of the type (-) C | Ag | Ag3GeS3I(Br) glass | D | C (+) where C are inert (graphite) electrodes; Ag and D are the electrodes of the ECC; D represents the alloy of four-phase region; Ag3GeS3I glass is a membrane with purely ionic Ag+ conductivity). Linear dependence of the EMF of cell on temperature in the range of 440-480 K was used to calculate the standard thermodynamic functions of saturated solid solution of AgIn2Te3I compound in Ag-In-Te-I system.

  7. Equilibrium reconstruction in the TCA/Br tokamak; Reconstrucao do equilibrio no tokamak TCA/BR

    Energy Technology Data Exchange (ETDEWEB)

    Sa, Wanderley Pires de

    1996-12-31

    The accurate and rapid determination of the Magnetohydrodynamic (MHD) equilibrium configuration in tokamaks is a subject for the magnetic confinement of the plasma. With the knowledge of characteristic plasma MHD equilibrium parameters it is possible to control the plasma position during its formation using feed-back techniques. It is also necessary an on-line analysis between successive discharges to program external parameters for the subsequent discharges. In this work it is investigated the MHD equilibrium configuration reconstruction of the TCA/BR tokamak from external magnetic measurements, using a method that is able to fast determine the main parameters of discharge. The thesis has two parts. Firstly it is presented the development of an equilibrium code that solves de Grad-Shafranov equation for the TCA/BR tokamak geometry. Secondly it is presented the MHD equilibrium reconstruction process from external magnetic field and flux measurements using the Function Parametrization FP method. this method. This method is based on the statistical analysis of a database of simulated equilibrium configurations, with the goal of obtaining a simple relationship between the parameters that characterize the equilibrium and the measurements. The results from FP are compared with conventional methods. (author) 68 refs., 31 figs., 16 tabs.

  8. La Alpaca -vaatemerkin brändäys

    OpenAIRE

    Lehtinen, Laura

    2013-01-01

    Tämä opinnäytetyö käsittelee brändin vahvistamista ja brändiohjeiston luomista vaa-tealan yritykselle La Alpacalle. La Alpaca on suomalainen vaatemerkki, joka suunnit-telee, tuottaa ja myy alpakanvillasta valmistettuja tuotteita. Materiaalin ainutlaatuisuus ja hienous ovat olleet osa yrityksen identiteettiä alusta asti. Brändin lisäksi työssä on tutkittu kaupankäynnin rakenteellista muuttumista perinteisestä myymälätoiminnasta verkkomyyntiin. Työn tavoitteena on ollut luoda materiaalin tun...

  9. Crystalline structure and electrical properties of Dy1-XCaXMnO3 solid solution

    Directory of Open Access Journals (Sweden)

    Durán, P.

    2002-12-01

    Full Text Available Solid solutions corresponding to the Dy1-xCaXMnO3 system, x=0.0 to 0.60 have been studied. The powders were prepared by solid state reaction of the corresponding oxides and carbonates. Sintered bodies were obtained by firing between 1250 and 1450ºC. All the compositions showed single-phased perovskite-type structure with orthorhombic symmetry and Space Group Pbnm. Increase of the CaO content leads to a monotonic decrease of the orthorhombicity factor b/a with the Ca2+ concentration up to x=0.60. All the solid solutions crystallised with the same O’-type orthorhombic perovskite structure such as pure DyMnO3. Electrical measurements have shown semiconducting behaviour for all the solid solutions. The room temperature conductivity increases monotonically with the CaO content. The 60/40 Ca/Dy composition showed a high value of the electrical conductivity and a correlative very low value of the activation energy. Thermally activated small polaron hopping mechanism controls the conductivity of these perovskite ceramics.Se han estudiado soluciones sólidas correspondientes al sistema Dy1-xCaxMnO3, x=0.0 a 0.60. Los polvos cerámicos fueron preparados por reacción en estado sólido de los correspondientes óxidos y carbonatos. Los materiales cerámicos se obtuvieron por sinterización entre 1250º y 1450ºC. Todas las composiciones fueron monofásicas y mostraron una estructura tipo perovskita, con simetría ortorrómbica y Grupo Espacial Pbnm. El aumento del contenido en CaO llevó a una disminución monótona del factor de ortorrombicidad, b/a. Todas las soluciones sólidas cristalizaron con el mismo tipo de estructura perovskita ortorrómbica O’, como la del compuesto puro DyMnO3. Las medidas eléctricas mostraron comportamiento semiconductor en todas las soluciones sólidas. La conductividad a temperatura ambiente aumenta monótonamente con el contenido de CaO. La composición 60/40 mostró un elevado valor de conductividad y un correlativo

  10. Investigation of complexes with bone affinity using the In vivo generator system {sup 166} Dy/{sup 166} Ho; Investigacion de complejos con afinidad osea utilizando el Sistema de Generador in vivo {sup 166} Dy/{sup 166} Ho

    Energy Technology Data Exchange (ETDEWEB)

    Pedraza L, M

    2006-07-01

    The importance of this original research lies in the fact that it has proven that the [{sup 166}Dy]Dy/{sup 166}Ho-EDTMP in vivo generator system is a stable complex that can be used as a therapeutic radiopharmaceutical. Multiple myeloma and other hematological malignancies have been treated by myeloablative radiotherapy/chemotherapy and subsequent stem cell transplantation. Bone-seeking radiopharmaceuticals such as {sup 166}Ho-DOTMP or {sup 153}Sm-DTMP, have been proposed for delivering ablative radiation doses to marrow in multiple myeloma and other hematological malignancies or have shown excellent results in palliative bone metastasis pain therapy, respectively. As lanthanides have similar chemical characteristics the phosphonate with bone affinity (EDTMP) labeled with Dy/Ho can be used for marrow ablation while causing minimal irradiation to normal organs. This in vivo generator system has not been previously reported. The aim of this research was to label EDTMP (ethylene diamine tetramethylene phosphonate) with {sup 166}Dy/{sup 166}Ho; to evaluate the in vitro and in vivo stability of both {sup 166}Dy-EDTMP and {sup 166}Ho-EDTMP complexes when the daughter {sup 166}Ho is formed as a dysprosium decay product; to determine the bone marrow cytotoxic and genotoxic effect in mice and to evaluate, by histopathology, the myeloablative potential of the [{sup 166}Dy]Dy/{sup 166}Ho-EDTMP in vivo generator system. {sup 166}Dy was obtained by neutron irradiation of enriched {sup 164}Dy{sub 2}O{sub 3} in a TRIGA Mark III reactor. Labeling was carried out in an aqueous phosphate medium at pH 8.0 by addition of {sup 166}DyCl{sub 3} to EDTMP at a molar ratio 1:1.75, with >99 % radiochemical purity, as determined by thin-layer chromatography (TLC) and high-performance liquid chromatography (HPLC). In vitro studies demonstrated that {sup 166}Dy/{sup 166}Ho-EDTMP is unstable after dilution in saline but stable in human serum with no translocation of the daughter nucleus

  11. Ultrahigh coercivity and core-shell microstructure achieved in oriented Nd-Fe-B thin films diffusion-processed with Dy-based alloys

    Energy Technology Data Exchange (ETDEWEB)

    Zhang, Tongbo; Zhou, Xiaoqian; Yu, Dedong; Fu, Yanqing; Cui, Weibin [Northeastern University, Key Laboratory of Electromagnetic Processing of Materials (EPM), Ministry of Education, Shenyang (China); Northeastern University, Department of Physics and Chemistry of Materials, School of Materials Science and Engineering, Shenyang (China); Li, Guojian; Wang, Qiang [Northeastern University, Key Laboratory of Electromagnetic Processing of Materials (EPM), Ministry of Education, Shenyang (China)

    2017-01-15

    Ultrahigh ambient coercivities of ∝4 T were achieved in Nd-Fe-B benchmark thin film with coercivity of 1.06 T by diffusion-processing with Dy, Dy{sub 70}Cu{sub 30} and Dy{sub 80}Ag{sub 20} alloy layer. High texture and good squareness were obtained. In triple-junction regions, Dy element was found to be immiscible with Nd element. Microstructure observation indicated the typical gradient elementary distribution. Unambiguous core/shell microstructure was characterized by transition electron microscopy. Due to the enhanced ambient coercivity, the coercivity temperature stability was also substantially increased. (orig.)

  12. Scaling of the anomalous Hall effect in epitaxial antiperovskite Mn3.5Dy0.5N involving multiple competing scattering mechanisms

    Science.gov (United States)

    Meng, M.; Wu, S. X.; Zhou, W. Q.; Li, S. W.

    2016-08-01

    Anomalous Hall effect (AHE) has been studied for ferrimagnetic antiperovskite Mn3.5Dy0.5N film grown by molecular-beam epitaxy. Reflective high energy electron diffraction and transmission electron microscopy demonstrate the high quality of the film. We have used a scaling involving multiple competing scattering mechanisms to distinguish variations of contributions to the AHE by heavily doped Dy. The scaling analysis revealed that the heavily doped Dy has dramatically modified the skew scattering part of the AHE in Mn4N and Mn3.5Dy0.5N has a totally different scattering mechanism from an undoped film.

  13. Effect Of DyMn Alloy-Powder Addition On Microstructure And Magnetic Properties Of NdFeB Sintered Magnets

    Directory of Open Access Journals (Sweden)

    Lee M.-W.

    2015-06-01

    Full Text Available Micostructural change and corresponding effect on coercivity of a NdFeB sintered magnet mixed with small amount of DyMn powder was investigated. In the sintered magnet mixed with the DyMn alloy-powder Dy-rich shell was formed at outer layer of the main grains, while Mn was mostly concentrated at Nd-rich triple junction phase (TJP, lowering melting temperature of the Nd-rich phase that eventually improved the microstructural characteristics of the gain boundary phase. The coercivity of a magnet increased more than 3.5 kOe by the mixing of the DyMn alloy-powder.

  14. High energy electron beams characterization using CaSO{sub 4}:Dy+PTFE Phosphors for clinical therapy applications

    Energy Technology Data Exchange (ETDEWEB)

    Rivera, T., E-mail: trivera@ipn.mx [Centro de Investigacion en Ciencia Aplicada y Tecnologia Avanzada-Legaria, IPN. Av. Legaria 694, Col. Irrigacion. 11500 Mexico DF (Mexico); Espinoza, A.; Von, S.M. [Centro Estatal de Cancerologia de los Servicios de Salud de Nayarit, Enfermeria S/n, Fracc, Fray Junipero Serra, 63169 Tepic Nay (Mexico); Alvarez, R.; Jimenez, Y. [Centro de Investigacion en Ciencia Aplicada y Tecnologia Avanzada-Legaria, IPN. Av. Legaria 694, Col. Irrigacion. 11500 Mexico DF (Mexico)

    2012-07-15

    In the present work high energy electron beam dosimetry from linear accelerator (LINACs) for clinical applications using dysprosium doped calcium sulfate embedded in polytetrafluorethylene (CaSO{sub 4}:Dy+PTFE) was studied. The irradiations were carried out using high electron beams (6 to 18 MeV) from a linear accelerator (LINAC) Varian, CLINAC 2300C/D, for clinical practice purpose. The electron irradiations were obtained using the water solid in order to guarantee electronic equilibrium conditions (EEC). Field shaping for electron beams was obtained with electron cones. Glow curve and other thermoluminescent characteristics of CaSO{sub 4}:Dy+PTFE were conducted under high electrons beams irradiations. The TL response of the pellets showed an intensity peak centered at around 215 Degree-Sign C. TL response of CaSO{sub 4}:Dy+PTFE as a function of high electron absorbed dose showed a linearity in a wide range. To obtain reproducibility characteristic, a set of pellets were exposed repeatedly for the same electron absorbed dose. The results obtained in this study can suggest the applicability of CaSO{sub 4}:Dy+PTFE pellets for high electron beam dosimetry, provided fading is correctly accounted for. - Highlights: Black-Right-Pointing-Pointer Developing of CaSO{sub 4}:Dy to electron beams dosimetry. Black-Right-Pointing-Pointer Characterization of caSO{sub 4}:Dy to radiation safety in LINACs. Black-Right-Pointing-Pointer TL characteristics of CaSO{sub 4}:Dy for electron beams quality control.

  15. Surface photo-discoloration and degradation of dyed wood veneer exposed to different wavelengths of artificial light

    Energy Technology Data Exchange (ETDEWEB)

    Liu, Yi [MOE Key Laboratory of Wooden Material Science and Application, Beijing Forestry University, Beijing 100083 (China); Beijing Key Laboratory of Wood Science and Engineering, Beijing Forestry University, Beijing 100083 (China); MOE Engineering Research Center of Forestry Biomass Materials and Bioenergy, Beijing Forestry University, Beijing 100083 (China); Forest Products Development Center, School of Forestry and Wildlife Sciences, Auburn University, Auburn, AL 36830 (United States); Shao, Lingmin [MOE Key Laboratory of Wooden Material Science and Application, Beijing Forestry University, Beijing 100083 (China); Gao, Jianmin, E-mail: jmgao@bjfu.edu.cn [MOE Key Laboratory of Wooden Material Science and Application, Beijing Forestry University, Beijing 100083 (China); Beijing Key Laboratory of Wood Science and Engineering, Beijing Forestry University, Beijing 100083 (China); MOE Engineering Research Center of Forestry Biomass Materials and Bioenergy, Beijing Forestry University, Beijing 100083 (China); Guo, Hongwu, E-mail: hwg5052@163.com [MOE Key Laboratory of Wooden Material Science and Application, Beijing Forestry University, Beijing 100083 (China); Beijing Key Laboratory of Wood Science and Engineering, Beijing Forestry University, Beijing 100083 (China); MOE Engineering Research Center of Forestry Biomass Materials and Bioenergy, Beijing Forestry University, Beijing 100083 (China); Chen, Yao [MOE Key Laboratory of Wooden Material Science and Application, Beijing Forestry University, Beijing 100083 (China); Beijing Key Laboratory of Wood Science and Engineering, Beijing Forestry University, Beijing 100083 (China); MOE Engineering Research Center of Forestry Biomass Materials and Bioenergy, Beijing Forestry University, Beijing 100083 (China); Cheng, Qingzheng; Via, Brian K. [Forest Products Development Center, School of Forestry and Wildlife Sciences, Auburn University, Auburn, AL 36830 (United States)

    2015-03-15

    Highlights: • Investigate the selective absorption of different wavelengths of UV–vis light by dyed wood chromophores. • Identify connection between light wavelengths and surface color changes and chemical structure degradation. • Study hypochromic effect based on surface reflectance and K/S absorption changes during UV–vis irradiation. - Abstract: The surface of dyed wood is prone to discoloration when exposed to light irradiation which significantly decreases its decorative effect and shortens its service life. The influence of light wavelength exposure to the surface of dyed wood was investigated to study the effect on discoloration and degradation. Acid Blue V and Acid Red GR dyed wood veneers were subjected to light exposure with different wavelengths from the UV to visible region (254–420 nm). Results showed that the surface discoloration of dyed wood was linearly related to lignin concentration and dyes degradation and the consequent transformation of chromophoric groups such as aromatic (C=C) and carbonyl (C=O) through methoxy reaction. The dyes, lignin and some active constituents were degraded severely, even at short exposures. Acid Blue V dyed wood exhibited greater discoloration than the Acid Red GR treatment. The reflectance and K/S absorption curve showed a hypochromic effect on the dyed wood surface. The dyes and wood chemical structure played a complex and combined role on the selective absorption of different wavelengths of light. The color change rate was apparent with 254 nm exposure in the initial stages, but a greater discoloration rate occurred on the samples irradiated at 313 and 340 nm than at 254 and 420 nm with the time prolonged. The degradation rate and degree of discoloration correlated well with the light energy and wavelength.

  16. Hybridization of Single Nanocrystals of Cs4PbBr6 and CsPbBr3

    OpenAIRE

    Weerd, Chris de; Lin, Junhao; Gomez, Leyre; Fujiwara, Yasufumi; Suenaga, Kazutomo; Gregorkiewicz, Tom

    2017-01-01

    Nanocrystals of all-inorganic cesium lead halide perovskites (CsPbX3, X = Cl, Br, I) feature high absorption and efficient narrow-band emission which renders them promising for future generation of photovoltaic and optoelectronic devices. Colloidal ensembles of these nanocrystals can be conveniently prepared by chemical synthesis. However, in the case of CsPbBr3, its synthesis can also yield nanocrystals of Cs4PbBr6 and the properties of the two are easily confused. Here, we investigate in de...

  17. Preparation of {sup 166} Dy/{sup 166} Ho DTPA-bis biotin as a system of In vivo generator; Preparacion de {sup 166} Dy/{sup 166} Ho DTPA-bis biotina como un sistema de generador In vivo

    Energy Technology Data Exchange (ETDEWEB)

    Jimenez V, M.R

    2003-07-01

    The objective of this work was to synthesize the complex {sup 166} Dy/{sup 166} Ho - diethylen triamine pentaacetic-bis Biotin ({sup 166} Dy/{sup 166} Ho DTPA-bis Biotin) to evaluate its potential as a new radiopharmaceutical in directed radiotherapy. The Dysprosium-166 was obtained for neutron irradiation of {sup 164} Dy{sub 2}0{sub 3} in the TRIGA Mark III reactor. The labelled was carried out in aqueous solution to p H 8.0 for addition of {sup 166} Dy Cl{sub 3} to the diethylen triamine pentaacetic-{alpha}, {omega}-bis Biotin (DTPA-bis Biotin). The radiochemical purity was determined for HPLC and ITLC. The biological integrity of the marked biotin is evaluated by the biological recognition of the avidin for HPLC - molecular exclusion with and without avidin addition. The studies of stability in vitro were made in dilutions of saline solution to 0.9% and with human serum at 37 C incubated 1 and 24 hours. The complex {sup 166} Dy/{sup 166} Ho DTPA-bis Biotin was obtained with a radiochemical purity of 99.1 {+-} 0.6%. The biological recognition of the complex {sup 166} Dy/{sup 166} Ho DTPA-bis Biotin for the avidin it doesn't affect the labelling procedure. The studies in vitro demonstrated that the {sup 166} Dy/{sup 166} Ho DTPA-bis Biotin is stable after the dilution in saline solution and in human serum that there is not translocation of the one radionuclide subsequent son to the beta decay of the {sup 166} Dy that could produce the {sup 166} Ho{sup 3+} liberation. The studies of Biodistribution in healthy mice demonstrated that the one complex {sup 166} Dy/{sup 166} Ho DTPA-bis Biotin have a high renal distribution. In conclusion the radiolabelled biotin in this investigation has the appropriate properties to be used as an In vivo generator system stable for directed radiotherapy. (Author)

  18. Elu Brüsselis - teisem kui siin / Juune Holvandus

    Index Scriptorium Estoniae

    Holvandus, Juune

    2000-01-01

    Brüsseli kesklinnas elavast noorpaarist ja nende kodust. Veronique Mägi (isa eestlane) on tõlk. Ettevõtja Frederic Flamand on õppinud antiigindust. 1996. a. elati Eestis. Inimsuhetest Eestis ja Belgias. 11 ill.

  19. GMO konverents Brüsselis / Nastja Pertsjonok

    Index Scriptorium Estoniae

    Pertsjonok, Nastja

    2007-01-01

    Brüsselis toimunud GMO-vabade piirkondade konverentsist, kus räägiti GMO-vabade piirkondade liikumisest, GMO-de lubamisest ja keelamisest ning hoiakutest nende suhtes Euroopa Liidus ja mujal maailmas

  20. Kan lignin omdannes til flydende brændstof?

    DEFF Research Database (Denmark)

    Nielsen, Joachim Bachmann; Jensen, Anders; Felby, Claus

    2015-01-01

    Ved en solvolytisk omdannelse af plantematerialet lignin til et flydende brændstof behandles det ved høj temperatur og højt tryk i et passende opløsningsmiddel. En sådan proces kan gennemføres ikke-katalytisk og være med til at skabe flydende brændsler baseret på vedvarende energikilder. Her...

  1. Saltindhold i brød og morgenmadscerealier

    DEFF Research Database (Denmark)

    Trolle, Ellen; Saxholt, Erling; Knuthsen, Pia

    2016-01-01

    Saltindholdet i hvedebrød og rugbrød på de danske supermarkedshylder er faldet fra 2009 til 2014. En tilsvarende trend er ikke registreret i brød fra bagerbutikker. Udviklingen betyder, at en større andel af industrielt fremstillede brød end bagerbrød indsamlet i 2014 overholder Nøglehulsmærkets ...... overstiger Nøglehulsmærkets saltkrav. Saltindholdet er dog faldet i forhold til tidligere....

  2. Populations locales et unités de conservation : de l’exclusion à une inclusion incomplète (le cas de la Forêt nationale du Tapajós, Amazonie brésilienne Populações locais e unidades de conservação : da exclusão à uma inclusão incompleta (o caso da Floresta nacional do Tapajós, Amazônia Brasileira. Local populations and conservation areas: from exclusion to a partial inclusion (case study from the Tapajós National Forest, Brazilian Amazon

    Directory of Open Access Journals (Sweden)

    Xavier Arnauld de Sartre

    2012-06-01

    Full Text Available L’intérêt croissant accordé aux aires protégées (AP dans les politiques internationales de protection de la nature nécessite d’analyser en aval le rôle dévolu aux populations vivant dans ces espaces. Bien qu’excluant souvent, de fait, les populations locales, il apparaît qu’une inclusion de ces populations dans le périmètre des aires protégées est tout à fait possible. C’est en tous cas ce que montre l’étude d’une AP d’Amazonie brésilienne que nous nous proposons de mener ici, en insistant plus particulièrement sur l’histoire de cette inclusion, ses modalités et sur les problèmes restant à résoudre. L’analyse historique du conflit dans la Forêt nationale du Tapajós reflète le fait que les différentes catégories d’AP au Brésil ont su évoluer pour s’adapter aux contextes locaux. L’implantation de cette AP, et son acceptation par les populations, a nécessité l’adaptation de l’administration aux règles locales d’usage et de gestion des ressources, mais aussi en retour de l’adaptation de ces dernières aux normes institutionnelles de gestion. L’évolution de l’inclusion des habitants dans la gouvernance de cette AP s’est faite de plus sous l’impulsion des institutions internationales, en contrepartie de leur soutien financier à divers programmes de développement au niveau local. Depuis que les relations entre population locale et institution gestionnaire se sont stabilisées dans cette AP, les défis concernant le maintien sur place de la population locale se sont dès lors déplacés vers la dépendance croissante aux ressources et biens de consommations externes et vers les transformations qu’ont induit les projets de développement sur le système local de production.O interesse crescente às unidades de conservação (UC nas políticas internacionais de proteção da Natureza necessita considerar o papel das populações humanas  que habitam nesses espaços. Apesar do

  3. Effect of the temperature in the sensitivity of CaSO{sub 4}: Dy; Efecto de la temperatura en la sensibilidad del CaSO{sub 4}: Dy

    Energy Technology Data Exchange (ETDEWEB)

    Gonzalez, P.R. [Instituto Nacional de Investigaciones Nucleares, A.P. 18-1027, 11801 Mexico D.F. (Mexico); Alcantara, B.C. [Facultad de Quimica, Universidad Autonoma del Estado de Mecico, Paseo Tollocan, Esq. con Jesus Carranza, 50180 Toluca, Estado de Mexico (Mexico); Azorin, J.; Furetta, C. [Universidad Autonoma Metropolitana- Iztapalapa, San Rafael Atlixco 186, 09340 Mexico, D.F. (Mexico)

    2003-07-01

    Sensitivity of a Tl material is one of the most important properties for dosimetry. This property is optimized by means of various processes such as the incorporation of different dopants into the matrix material, the application of certain doses of ionizing radiation and carefully controlled thermal treatments among others. Results obtained of studying the sensitivity of diverse preparations of CaSO{sub 4}: Dy submitted different thermal treatments are presented. The material, which presented the highest sensitivity, was that one it was heated to 800 C during one hour. When the temperature was raised over this value it was observed that sensitivity drops again. In other hand, as the heating rate in lowing down, during the readout, the height of the glow curve decreases proportionally. The temperature of the maximum of the main peak also decreases. (Author)

  4. Preparation and structural characterization of the thermoluminescent material CaSO{sub 4}: Dy; Preparacion y caracterizacion estructural del material termoluminiscente CaSO{sub 4}: Dy

    Energy Technology Data Exchange (ETDEWEB)

    Sanchez R, A.; Azorin, J. [UAM-I, 09340 Mexico D.F. (Mexico); Gonzalez M, P.R. [ININ, 52045 Ocoyoacac, Estado de Mexico (Mexico); Rivera, T. [CICATA-IPN, Legaria 694, 11500 Mexico D.F. (Mexico)

    2005-07-01

    The grade of crystallinity of a material is important so that the one is presented the thermoluminescence phenomenon; for what is necessary to study those structural characteristic of a TL material and to correlate them with its TL response when being irradiated with ionizing radiation. The calcium sulfate activated with Dysprosium (CaSO{sub 4}: Dy) it is a material that has demonstrated its efficiency in the dosimetry of the ionizing radiation for the thermoluminescence method. In this work the structural characterization of this prepared material for the recrystallization method by means of the evaporation of the solvent and their relationship with their TL response is presented. The results showed that the best material to be used in thermoluminescent dosimetry presents a crystalline structure in orthorhombic phase and a particle size in the interval of 80 {mu}m to 200 {mu}m. (Author)

  5. Atmospheric lifetimes and ozone depletion potentials of methyl bromide (CH3Br) and dibromomethane (CH2Br2)

    Energy Technology Data Exchange (ETDEWEB)

    Mellouki, A.; Talukdar, R.K.; Schmoltner, A.; Gierczak, T.; Mills, M.J.; Solomon, S.; Ravishankara, A.R. (NOAA, Boulder, CO (United States))

    1992-10-01

    The rate coefficients for the reactions of OH radical with CH3Br and CH2Br2 were measured as functions of temperature using the laser photolysis - laser induced fluorescence method. This data was incorporated into a semiempirical model (Solomon et al., 1992) and a 2D model to calculate the steady-state ozone depletion potentials (ODP) and atmospheri lifetimes, tau, with greatly improved accuracy as compared to earlier studies. The calculated ODPs and tau are 0.65 and 1.7 years and 0.17 and 0.41 years for CH3Br and CH2Br2, respectively, using the semiempirical model. These lifetimes agree well with those calculated using a 2D model. This study better quantifies the ODPs and tau of these species which are needed inputs for discussion of possible regulation of human emissions currently under international considerations. 29 refs.

  6. Unipolar resistive switching behavior in Dy{sub 2}O{sub 3} films for nonvolatile memory applications

    Energy Technology Data Exchange (ETDEWEB)

    Her, Jim-Long [Division of Natural Science, Center for General Education, Chang Gung University, Taoyuan 333, Taiwan (China); Pan, Tung-Ming, E-mail: tmpan@mail.cgu.edu.tw [Department of Electronics Engineering, Chang Gung University, Taoyuan 333, Taiwan (China); Lu, Chih-Hung [Department of Electronics Engineering, Chang Gung University, Taoyuan 333, Taiwan (China)

    2012-06-30

    In this article, we report the forming-free resistive switching behavior of a Ru/Dy{sub 2}O{sub 3}/TaN memory device incorporating a Dy{sub 2}O{sub 3} thin film fabricated entirely through processing at room temperature. We used X-ray diffraction, secondary ion mass spectrometry, and X-ray photoelectron spectroscopy to investigate the structural and chemical features of the Dy{sub 2}O{sub 3} film. The dominant conduction mechanisms in the low- and high-resistance states were ohmic behavior and Poole-Frenkel emission, respectively. The Ru/Dy{sub 2}O{sub 3}/TaN memory device exhibited a high resistance ratio and provided nondestructive readout and reliable data retention. This memory device has a great potential for application in nonvolatile resistive switching memory. - Highlights: Black-Right-Pointing-Pointer The forming-free resistive switching behavior in the Ru/Dy{sub 2}O{sub 3}/TaN device was investigated. Black-Right-Pointing-Pointer The conduction mechanisms of the device are ohmic behavior and Poole-Frenkel emission. Black-Right-Pointing-Pointer This memory device exhibits good electrical characteristics.

  7. Optical and structural investigation of Dy3+-Nd3+ co-doped in magnesium lead borosilicate glasses.

    Science.gov (United States)

    Rao, T G V M; Rupesh Kumar, A; Neeraja, K; Veeraiah, N; Rami Reddy, M

    2014-01-24

    MgO-PbO-B2O3-SiO2-Nd2O3-Dy2O3 glasses are prepared by melt-quenching technique. The samples are characterized by X-ray diffraction (XRD), optical absorption, luminescence and Fourier transform infrared (FT-IR) spectral studied. XRD analysis evidently indicates that the prepared samples are fully amorphous nature. From the optical absorption spectra, the bonding environment surrounding the Dy(3+) and their energy level scheme in glass network is analyzed. Enhancement of Dy(3+) emission by non-radiative energy transfers from Nd(3+) has been observed here. The samples emits intensive bluish yellow color from the (4)F9/2→(6)H15/2, (6)H13/2 transition of Dy(3+) ions in these glasses which are nearer to white light and it is also supported by the chromaticity color coordinates. The FT-IR spectra reveal that network connectivity is increased with replacement of bonds B-O-B, Si-O-Si by more resistant B-O-Si bonds with gradually increasing the content of Dy(3+) ions in the glass network. Along with spectroscopic parameters some physical parameters like density, refractive index etc. are measured for the glasses. Copyright © 2013 Elsevier B.V. All rights reserved.

  8. THE VERY YOUNG TYPE Ia SUPERNOVA 2013dy: DISCOVERY, AND STRONG CARBON ABSORPTION IN EARLY-TIME SPECTRA

    Energy Technology Data Exchange (ETDEWEB)

    Zheng, WeiKang; Filippenko, Alexei V.; Nugent, Peter E.; Graham, Melissa; Kelly, Patrick L.; Fox, Ori D.; Shivvers, Isaac; Clubb, Kelsey I.; Li, Weidong [Department of Astronomy, University of California, Berkeley, CA 94720-3411 (United States); Silverman, Jeffrey M.; Howie Marion, G. [Department of Astronomy, University of Texas, Austin, TX 78712 (United States); Kasen, Daniel [Lawrence Berkeley National Laboratory, Berkeley, CA 94720 (United States); Wang, Xiaofeng [Department of Physics, Tsinghua University, Beijing 100084 (China); Valenti, Stefano; Howell, D. Andrew [Las Cumbres Observatory Global Telescope Network, 6740 Cortona Drive, Suite 102, Santa Barbara, CA 93117 (United States); Ciabattari, Fabrizio [Monte Agliale Observatory, Borgo a Mozzano, Lucca, I-55023 Italy (Italy); Cenko, S. Bradley [Astrophysics Science Division, NASA Goddard Space Flight Center, Mail Code 661, Greenbelt, MD 20771 (United States); Balam, Dave [Dominion Astrophysical Observatory, Herzberg Institute of Astrophysics, National Research Council of Canada, 5071 West Saanich Road, Victoria, BC V9E 2E7 (Canada); Hsiao, Eric [Carnegie Observatories, Las Campanas Observatory, Colina El Pino, Casilla 601 (Chile); Sand, David, E-mail: zwk@astro.berkeley.edu [Physics Department, Texas Tech University, Lubbock, TX 79409 (United States); and others

    2013-11-20

    The Type Ia supernova (SN Ia) 2013dy in NGC 7250 (d ≈ 13.7 Mpc) was discovered by the Lick Observatory Supernova Search. Combined with a prediscovery detection by the Italian Supernova Search Project, we are able to constrain the first-light time of SN 2013dy to be only 0.10 ± 0.05 days (2.4 ± 1.2 hr) before the first detection. This makes SN 2013dy the earliest known detection of an SN Ia. We infer an upper limit on the radius of the progenitor star of R {sub 0} ≲ 0.25 R {sub ☉}, consistent with that of a white dwarf. The light curve exhibits a broken power law with exponents of 0.88 and then 1.80. A spectrum taken 1.63 days after first light reveals a C II absorption line comparable in strength to Si II. This is the strongest C II feature ever detected in a normal SN Ia, suggesting that the progenitor star had significant unburned material. The C II line in SN 2013dy weakens rapidly and is undetected in a spectrum 7 days later, indicating that C II is detectable for only a very short time in some SNe Ia. SN 2013dy reached a B-band maximum of M{sub B} = –18.72 ± 0.03 mag ∼17.7 days after first light.

  9. Ab initio, theoretical and Monte Carlo approaches for the magnetocaloric effect in DyNi4Si

    Science.gov (United States)

    Laghrissi, Ayoub; Salmani, El Mehdi; Ez-Zahraouy, Hamid; Benyoussef, Abdelilah

    2016-08-01

    The magnetic and magnetocaloric properties of DyNi4Si alloys in YNi4Si-type orthorhombic structure have been investigated by using a combination of first-principles calculations and mean field theory, effective field theory, and Monte Carlo simulation. We find that Magnetic results of DyNi4Si compound show ferromagnetic-type ordering at 19 K, the magnetization-field isotherms for DyNi4Si exhibit hysteresis loop at 2 K due to strong magnetic anisotropy. The non-saturating behavior and the value of the magnetic moment of 7.7 μB/fu in 140 kOe at 2 K where the theoretical value for DyNi4Si only is about 10 μB, this suggest a not completely ordered ferromagnetic state of DyNi4Si (Morozkin et al., 2015) [2]. The isothermal entropy changes for H=14 T at T=22 K is -ΔS=15.6 J/(kg K). The obtained results are in good agreement with available experimental data. This study allows the suggestion of the compatible Ising model for a new class of compound YNi4Si-type, which shows magnetocaloric behavior at low temperature.

  10. Study of ammonium fluoride passivation time on CdZnTe bulk crystal wafers

    Energy Technology Data Exchange (ETDEWEB)

    Bensalah, H.; Crocco, J.; Carcelen, V.; Plaza, J.L.; Zheng, Q.; Dieguez, E. [Crystal Growth Laboratory, Departamento de Fisica de Materiales, Universidad Autonoma de Madrid, Cantoblanco, 28049 Madrid (Spain); Marchini, L. [IMEM-CNR, Parma (Italy); Zanichelli, M. [Department of Physics, University of Parma (Italy); Dominguez, G.; Soriano, L. [Departamento de Fisica Aplicada and Instituto de Ciencias de Materiales Nicolas Cabrera, Universidad Autonoma de Madrid, Cantoblanco, 28049 Madrid (Spain)

    2011-07-15

    The chemical etching and the passivation processes of CdZnTe wafers were studied. The treatment effects were tested through an X-Ray Photoelectron Spectroscopy (XPS) analysis and I-V measurement. The chemical etching in 2%Br-MeOH solution may effectively remove the damaged layer and improve the ohmic contact between CdZnTe wafer and Au electrodes making rich the surface with Te. After different etching times, the CdZnTe wafers were passivated with NH{sub 4}F/H{sub 2}O{sub 2}.CdZnTe wafer passivated immediately after etching showed the best passivation efficiency because the enriched Te on the surface was fully oxidized to TeO{sub 2}, which results in the thickest oxide layer, and the most stoichiometric surface. Also the surface leakage current was reduced in comparison with the sample passivated 24 h after etching. (copyright 2011 WILEY-VCH Verlag GmbH and Co. KGaA, Weinheim) (orig.)

  11. Tunable photoluminescence and room temperature ferromagnetism of In2S3:Dy3+,Tb3+ nanoparticles.

    Science.gov (United States)

    Li, Zhifang; Yang, Tianye; Zhao, Qi; Zhang, Mingzhe

    2017-06-28

    Trivalent lanthanide-doped luminescent nanomaterials have unique spectral and magnetic properties, which have been extensively investigated due to their potential application prospects in a number of new technologies. The rare earth Dy3+ and Tb3+ ions co-doped β-In2S3 dilute nanoparticles with different doping concentrations were successfully synthesized by a gas-liquid phase chemical deposition method. The band gap energy could be tuned by varying the doping concentration from 3.17 to 3.51 eV. The In2S3:Dy3+,Tb3+ nanoparticles exhibited strong photoluminescence emission peaks and room temperature ferromagnetism. Under excitation at 352 nm, the intrinsic emission and transitions of 5D4 → 7F6 for Tb3+ and 4F9/2 → 6H13/2 for Dy3+ were observed. The saturation magnetizations presented an increasing trend and then decreased as the doping concentration increased. This can be ascribed to the fact that the enhanced antiferromagnetic interaction suppresses the ferromagnetic behavior after the doping concentration reaches a certain value. In addition, VASP first-principles calculations were used to further shed light on the magnetic origin and chemical bonding mechanism of the as-prepared samples. It was found that the magnetism could be attributed to In vacancies and the co-doped system is in favor of the formation of In vacancies. This study provides experimental and theoretical guidance for the design and synthesis of promising candidates for optical, magnetic, and spintronic applications.

  12. Application of traditional knowledge to create indigo-dyed fabric products in Sakon Nakhon Province, Thailand

    Directory of Open Access Journals (Sweden)

    Chanitsara Duangbubpa

    2015-07-01

    Full Text Available Indigo fabric is created by dying silk or cotton with color from the true indigo plant (Indigofera tinctoria and is a valuable commodity in Northeastern Thai communities. This is a qualitative investigation with two principal research aims: 1 To study the history and background of indigo-dyed fabric in Sakon Nakhon Province; 2 To study the current conditions and application of traditional knowledge in creating indigo-dyed fabric in Sakon Nakhon Province, Thailand. Data for this investigation were collected from document analysis and field research between July 2013 and July 2014. Results show that weaving groups are sponsored by the government and the local community to produce indigo-dyed fabric that can be transformed into a variety of different products that meet consumer needs. These products include blankets, scarves, shawls, formal wear and bags. Weaving communities prefer to use materials from the surrounding environment. Community members cultivate their own true indigo plants using the traditional processes inherited from generation to generation. The dye creation process requires plant matter to be soaked in water for 24 hours before it can be used in the dye mixture. The traditional dye mixture is 4 liters of indigo plant, 2 liters of natural lye water and 1 tablespoon of white lime. During the dyeing process, the cotton fabric is stirred and wring in the dye mixture until the color holds. The fabric is then rested and the process is repeated to achieve the desired hue. The quality of the dye is then tested by washing the fabric in clean water. By applying the resourcefulness of traditional knowledge used in the dye creation process to the marketing and sale of indigo fabric, the entire production will benefit

  13. Enhanced Luminescent Properties in Tm3+/Dy3+ Co-doped Transparent Phosphate Glass Ceramic

    OpenAIRE

    Yao L. Q.; Chen G. H.; Zhong H. J.; Cui S. C.; Li F; Gan J.Y.

    2016-01-01

    Novel Tm3+/Dy3+ co-doped phosphate glass and glass ceramic samples for white light emitting diodes were prepared by melt quenching method. Under 353 nm excitation, the colors of the luminescence of the glass and glass ceramic samples are white. The CIE chromaticity coordinates (0.338, 0.328) of the emission from the glass ceramic is close to the standard white-light illumination (0.333, 0.333). Compared to the glass, the fluorescence intensity in the glass ceramic is greatly enhanced.

  14. Optical properties of Dy3+ doped bismuth zinc borate glass and glass ceramics

    Science.gov (United States)

    Shanmugavelu, B.; Kanth Kumar, V. V. Ravi

    2012-06-01

    Dy3+ doped bismuth zinc borate transparent glasses were prepared by melt quenching technique and these glasses were used precursor to obtain transparent glass ceramics by heat treatment method. XRD pattern of the glass ceramic shows the formation of the β-BiB3O6 and Bi2ZnOB2O6 phases. The visible emission intensity of the glass ceramics is stronger than the glass. This can be due to the formation of nano nonlinear optical crystallites in glass matrix.

  15. Complex magnetism of Ho-Dy-Y-Gd-Tb hexagonal high-entropy alloy

    Science.gov (United States)

    Lužnik, J.; Koželj, P.; Vrtnik, S.; Jelen, A.; Jagličić, Z.; Meden, A.; Feuerbacher, M.; Dolinšek, J.

    2015-12-01

    Rare earth based equimolar Ho-Dy-Y-Gd-Tb hexagonal high-entropy alloy (HEA) is a prototype of an ideal HEA, stabilized by the entropy of mixing at any temperature with random mixing of elements on the hexagonal close-packed lattice. In order to determine intrinsic properties of an ideal HEA characterized by the enormous chemical (substitutional) disorder on a weakly distorted simple lattice, we have performed measurements of its magnetic and electrical response and the specific heat. The results show that the Ho-Dy-Y-Gd-Tb hexagonal HEA exhibits a rich and complex magnetic field-temperature (H ,T ) phase diagram, as a result of competition among the periodic potential arising from the electronic band structure that favors periodic magnetic ordering, the disorder-induced local random potential that favors spin glass-type spin freezing in random directions, the Zeeman interaction with the external field that favors spin alignment along the field direction, and the thermal agitation that opposes any spin ordering. Three characteristic temperature regions were identified in the (H ,T ) phase diagram between room temperature and 2 K. Within the upper temperature region I (roughly between 300 and 75 K), thermal fluctuations average out the effect of local random pinning potential and the spin system behaves as a pure system of compositionally averaged spins, undergoing a thermodynamic phase transition to a long-range ordered helical antiferromagnetic state at the Néel temperature TN=180 K that is a compositional average of the Néel temperatures of pure Tb, Dy, and Ho metals. Region II (between 75 and 20 K) is an intermediate region where the long-range periodic spin order "melts" and the random ordering of spins in the local random potential starts to prevail. Within the low-temperature region III (below 20 K), the spins gradually freeze in a spin glass configuration. The spin glass phase appears to be specific to the rare earths containing hexagonal HEAs, sharing

  16. Electronic structures and magnetic properties of RB4 (R =Yb,Pr,Gd,Tb,Dy)

    Science.gov (United States)

    Choi, H. C.; Laref, Amel; Shim, J. H.; Kwon, S. K.; Min, B. I.

    2009-04-01

    Most rare-earth tetraborides RB4 have antiferromagnetic ground states except for YbB4 and PrB4. We have investigated the electronic structures and magnetic properties of RB4 (R =Yb,Pr,Gd,Tb,Dy) employing the first-principles total energy band method. It is found that YbB4 has the paramagnetic ground state, while the other tetraborides are in the magnetic ground state, which is in agreement with experiments. We have obtained the spin and orbital magnetic moments and discussed the importance of the spin-orbit interaction and the on-site Coulomb repulsion (U ) in these systems.

  17. Luminescence studies on Dy3+ doped calcium boro-tellurite glasses for White light applications

    Science.gov (United States)

    Karthikeyan, P.; Vijayakumar, R.; Marimuthu, K.

    2017-09-01

    A new series of Dy3+ doped calcium boro-tellurite glasses have been prepared by melt quenching technique and their spectroscopic properties were studied through FTIR, absorption luminescence and lifetime spectral measurements. FTIR studies have been made to explore the presence of various stretching and bending vibrations of different borate and tellurite groups in the prepared glasses. The bonding parameter values were estimated from the absorption band positions using Nephelauxetic ratios to examine the nature of the metal-ligand bond. The optical band gap and Urbach energy (ΔE) values were obtained from the absorption spectra to explore the electronic band structure of the studied glasses. Judd-Ofelt (JO) theory have been used to determine the JO intensity parameters (Ω2, Ω4, Ω6) following the least square fitting procedure between the experimental and calculated oscillator strength values. The luminescence spectra of the Dy3+ doped calcium boro-tellurite glasses exhibit two intense emission bands corresponding to the 4F9/2→6H15/2 and 4F9/2→6H13/2 transitions. Further, they exhibit less intense emission band due to the 4F9/2→6H11/2 transition. Luminescence spectra were characterized through CIE 1931 chromaticity diagram to obtain the dominant emission color of the prepared glasses. The JO intensity parameters and refractive index values have been used to calculate the radiative parameters such as transition probabilities (AR), branching ratios (βR) and stimulated emission cross-section (σPE) values for the observed transitions in the luminescence spectra. The decay curves of all the studied glasses found to exhibit non-exponential behavior and further to understand the energy transfer process takes place between the Dy3+ ions, the decay curves were fitted to the Inokuti-Hirayama (IH) model. The structural and optical properties of the Dy3+ doped calcium boro-tellurite glasses have been studied as a function of different metal cations (Zn, Cd, Pb and

  18. Intermixing and charge neutrality at DyScO{sub 3}/SrTiO{sub 3} interfaces

    Energy Technology Data Exchange (ETDEWEB)

    Luysberg, Martina, E-mail: M.Luysberg@fz-juelich.de [Institute of Solid State Research and Ernst Ruska-Centre for Microscopy and Spectroscopy with Electrons, Research Centre Juelich, D-52425 Juelich (Germany); Heidelmann, Markus; Houben, Lothar; Boese, Markus [Institute of Solid State Research and Ernst Ruska-Centre for Microscopy and Spectroscopy with Electrons, Research Centre Juelich, D-52425 Juelich (Germany); Heeg, Tassilo [Institute of Bio and Nanosystems, Research Centre Juelich, D-52425 Juelich (Germany); Schubert, Juergen; Roeckerath, Martin [Institute of Bio and Nanosystems, Research Centre Juelich, D-52425 Juelich (Germany)] [JARA, Fundamentals of Future Information Technology (Germany)

    2009-06-15

    Recently, interfaces between complex insulating oxides have attracted much attention due to their broad spectrum of electronic properties. Joining two materials of different polarity can provide highly conducting layers. The polar discontinuity delivers the driving force for a charge accumulation in the interfacial region which has been demonstrated for lanthanum-based perovskite interfaces with SrTiO{sub 3}. Here it is shown that the polar discontinuity can be accommodated by variations in composition of cation lattice planes at the polar oxide interface between DyScO{sub 3} and SrTiO{sub 3}, where DyScO{sub 3} holds the same polarity as the lanthanum-based perovskites. An intermixing extending over two monolayers at the interfaces for both the Dy-Sr sublattice and the Sc-Ti sublattice is quantified. As a result, charge neutrality is established by electrical compensation between neighbouring atomic planes.

  19. Luminescence properties of novel single-host white-light-emitting phosphor KBaBP2O8:Dy3+

    Science.gov (United States)

    Han, Bing; Zhang, Jie; Li, Pengju; Shi, Hengzhen

    2015-01-01

    A series of white-light-emitting KBaBP2O8:Dy3+ phosphors were synthesized by using a solid state reaction technique at high-temperature. X-ray diffraction and fluorescence spectroscopy measurements were utilized to characterize the structure and luminescence characteristics including excitation and emission spectra, decay curves, chromaticity coordinates of the assprepared phosphors. The influence of the doping concentration of Dy3+ on the relative emission intensity of Dy3+ was investigated. The critical distance as well as concentration quenching mechanism was calculated and confirmed. The as-prepared phosphors can be effectively excited with near ultraviolet, and exhibit white light emission with short decay time of milliseconds. The above work indicates these phosphors could be potential candidates as single-host white-light-emitting phosphors for application in white light-emitting-diodes.

  20. Slow and static spin correlations in Dy(2+x)Ti(2-x)O(7-d)

    Energy Technology Data Exchange (ETDEWEB)

    Gardner, Jason [Indiana University; Ehlers, Georg [ORNL; Fouquet, Peter [Institut Laue-Langevin (ILL); Farago, Bela [Institut Laue-Langevin (ILL); Stewart, John Ross [ISIS Facility, Rutherford Appleton Laboratory

    2011-01-01

    The static and dynamic spin correlations in the spin ices Dy{sub 2.3}Ti{sub 1.7}O{sub 6.85} and Dy{sub 2}Ti{sub 2}O{sub 7} have been studied in polarized neutron diffraction and neutron spin echo experiments. The measurements reveal that, below 100 mK, the magnetic scattering braodens and shifts to higher |Q| upon stuffing the pyrochlore lattice with additional Dy{sup 3+} ions. These observations can be related, by means of reverse Monte Carlo simulation, to the modified distribution of near-neighbour distances and an overall more antiferromagnetic character of the near-neighbour couplings. The dynamic measurements show that the spin correlations are slower in the stuffed system. These results will be discussed and compared to the holmium analogues.

  1. Finding the Missing Stratospheric Br(sub y): A Global Modeling Study of CHBr3 and CH2Br2

    Science.gov (United States)

    Liang, Q.; Stolarski, R. S.; Kawa, S. R.; Nielsen, J. E.; Douglass, A. R.; Rodriguez, J. M.; Blake, D. R.; Atlas, E. L.; Ott, L. E.

    2010-01-01

    Recent in situ and satellite measurements suggest a contribution of 5 pptv to stratospheric inorganic bromine from short-lived bromocarbons. We conduct a modeling study of the two most important short-lived bromocarbons, bromoform (CHBr3) and dibromomethane (CH2Br2), with the Goddard Earth Observing System Chemistry Climate Model (GEOS CCM) to account for this missing stratospheric bromine. We derive a "top-down" emission estimate of CHBr3 and CH2Br2 using airborne measurements in the Pacific and North American troposphere and lower stratosphere obtained during previous NASA aircraft campaigns. Our emission estimate suggests that to reproduce the observed concentrations in the free troposphere, a global oceanic emission of 425 Gg Br yr(exp -1) for CHBr3 and 57 Gg Br yr(exp -l) for CH2Br2 is needed, with 60% of emissions from open ocean and 40% from coastal regions. Although our simple emission scheme assumes no seasonal variations, the model reproduces the observed seasonal variations of the short-lived bromocarbons with high concentrations in winter and low concentrations in summer. This indicates that the seasonality of short-lived bromocarbons is largely due to seasonality in their chemical loss and transport. The inclusion of CHBr3 and CH2Br2 contributes 5 pptv bromine throughout the stratosphere. Both the source gases and inorganic bromine produced from source gas degradation (BrSLS) in the troposphere are transported into the stratosphere, and are equally important. Inorganic bromine accounts for half (2.5 pptv) of the bromine from the inclusion of CHBr3 and CHzBr2 near the tropical tropopause and its contribution rapidly increases to 100% as altitude increases. More than 85% of the wet scavenging of Br(sub y)(sup VSLS) occurs in large-scale precipitation below 500 hPa. Our sensitivity study with wet scavenging in convective updrafts switched off suggests that Br(sub y)(sup SLS) in the stratosphere is not sensitive to convection. Convective scavenging only

  2. BOREAS TE-13 Biometry Reports

    Data.gov (United States)

    National Aeronautics and Space Administration — The Boreal Ecosystem-Atmosphere Study (BOREAS) Terrestrial Ecology (TE)-13 team collected data on site characteristics, soil profiles, woody debris, overstory...

  3. Investigation of structural, spectral and photometric properties of CaTiO3:Dy3+ nanophosphors for the lighting applications

    Science.gov (United States)

    Singh, Dhananjay Kumar; Manam, Jairam

    2017-07-01

    A series of perovskite CaTiO3:Dy3+ nanophosphors have been prepared via solid state reaction method in order to investigate the structural, spectral and photometric properties. The structural, morphological and spectral properties of prepared nanophosphors were systematically characterized by XRD, FESEM, EDX, Photoluminescence, PL decay time and UV-Visible spectroscopy. The novel CaTiO3:Dy3+ nanophosphors exhibited single phase orthorhombic structure with space group Pbnm. The high magnification FESEM images of prepared sample demonstrated the particle size in the range 220-240 nm. The photoluminescence properties of Dy3+ doped CaTiO3 nanophosphors were investigated through excitation, emission spectra and decay time by varying the concentration of activator (Dy3+). Under the excitation of 386 nm UV light, Dy3+ activated CaTiO3 nanophosphors exhibited its characteristic excellent intense emissions in blue and yellow region around the wavelength 484 and 575 nm due to the transition 4F9/2→6H15/2 and 4F9/2 → 6H13/2 respectively. The photometric parameters such as CIE-coordinate and correlated color temperature (CCT) was also calculated. The CIE- coordinate (0.28, 0.32) was found near white light and CCT value was found to be 9222.31 K for optimum composition Ca0.96TiO3:0.04Dy3+ which was useful for cold light emission. The affirmative experimental results indicated that the prepared nanophosphors could be the favorable candidate for lighting applications.[Figure not available: see fulltext.

  4. Influence of Ag nanoparticles on the luminescence dynamics of Dy3+ ions in glass: the "plasmonic diluent" effect.

    Science.gov (United States)

    Jiménez, José A

    2013-10-28

    This work demonstrates that metallic nanoparticles (NPs) embedded in rare-earth (RE) co-doped dielectrics are able to produce an effect analogous to a reduction in the effective concentration of the luminescent RE ions in the matrix, herein coined the "plasmonic diluent" effect. This has been revealed explicitly for Dy(3+) and Ag NP co-doped aluminophosphate glasses, which were investigated using optical absorption and photoluminescence (PL) spectroscopy with emphasis on the influence of plasmonic NPs on the luminescence decay dynamics of Dy(3+) ions. The glasses were prepared using the melt-quenching technique, where the precipitation of Ag NPs was subsequently induced by heat treatment (HT). The development of the surface plasmon resonance (SPR) band of Ag NPs at around 410 nm resulted in the quenching of Dy(3+) emission for the (4)F9/2 → (6)H15/2, (6)H13/2 transitions (484, 574 nm) under resonant excitation of (6)H15/2 → (4)I15/2 transition at 450 nm. The decay of the (4)F9/2 excited state was monitored at 574 nm (away from SPR) under excitation at 450 nm (within SPR), where the PL dynamics indicated the presence of two populations of Dy(3+) ions in the glasses, in connection with slow (τs) and fast (τf) lifetime components. A tendency of the decay times to increase gradually with HT holding time was observed as the volume fraction of the plasmonic Ag particles increased. The data are interpreted in terms of an ion-to-particle excitation energy transfer operating via surface plasmons in the nanoscale metal. This produces a Dy(3+) deactivation effect analogous to a lowering in the effective concentration of emitting Dy(3+) ions in the matrix, i.e., the metal NPs play a role as a "plasmonic diluent" in the glass system with respect to the luminescent RE ions.

  5. Te/C nanocomposites for Li-Te Secondary Batteries.

    Science.gov (United States)

    Seo, Jeong-Uk; Seong, Gun-Kyu; Park, Cheol-Min

    2015-01-22

    New battery systems having high energy density are actively being researched in order to satisfy the rapidly developing market for longer-lasting mobile electronics and hybrid electric vehicles. Here, we report a new Li-Te secondary battery system with a redox potential of ~1.7 V (vs. Li(+)/Li) adapted on a Li metal anode and an advanced Te/C nanocomposite cathode. Using a simple concept of transforming TeO2 into nanocrystalline Te by mechanical reduction, we designed an advanced, mechanically reduced Te/C nanocomposite electrode material with high energy density (initial discharge/charge: 1088/740 mA h cm(-3)), excellent cyclability (ca. 705 mA h cm(-3) over 100 cycles), and fast rate capability (ca. 550 mA h cm(-3) at 5C rate). The mechanically reduced Te/C nanocomposite electrodes were found to be suitable for use as either the cathode in Li-Te secondary batteries or a high-potential anode in rechargeable Li-ion batteries. We firmly believe that the mechanically reduced Te/C nanocomposite constitutes a breakthrough for the realization and mass production of excellent energy storage systems.

  6. Aardkastanje, onopvallend en te weinig om te eten

    NARCIS (Netherlands)

    Spruijt, T.

    2010-01-01

    Hij staat vanaf half juni volop in bloei, maar wordt door weinigen gezien. Hoewel een zoektocht op Google anders doet vermoeden, wordt hij niet meer gegeten. De Aardkastanje is daarvoor te onopvallend en te zeldzaam in Nederland. Toch is het een bijzondere schermbloem.

  7. Molecular characterization of BrMYB28 and BrMYB29 paralogous transcription factors involved in the regulation of aliphatic glucosinolate profiles in Brassica rapa ssp. pekinensis.

    Science.gov (United States)

    Baskar, Venkidasamy; Park, Se Won

    2015-07-01

    Glucosinolates (GSL) are one of the major secondary metabolites of the Brassicaceae family. In the present study, we aim at characterizing the multiple paralogs of aliphatic GSL regulators, such as BrMYB28 and BrMYB29 genes in Brassica rapa ssp. pekinensis, by quantitative real-time PCR (qRT-PCR) analysis in different tissues and at various developmental stages. An overlapping gene expression pattern between the BrMYBs as well as their downstream genes (DSGs) was found at different developmental stages. Among the BrMYB28 and BrMYB29 paralogous genes, the BrMYB28.3 and BrMYB29.1 genes were dominantly expressed in most of the developmental stages, compared to the other paralogs of the BrMYB genes. Furthermore, the differential expression pattern of the BrMYBs was observed under various stress treatments. Interestingly, BrMYB28.2 showed the least expression in most developmental stages, while its expression was remarkably high in different stress conditions. More specifically, the BrMYB28.2, BrMYB28.3, and BrMYB29.1 genes were highly responsive to various abiotic and biotic stresses, further indicating their possible role in stress tolerance. Moreover, the in silico cis motif analysis in the upstream regulatory regions of BrMYBs showed the presence of various putative stress-specific motifs, which further indicated their responsiveness to biotic and abiotic stresses. These observations suggest that the dominantly expressed BrMYBs, both in different developmental stages and under various stress treatments (BrMYB28.3 and BrMYB29.1), may be potential candidate genes for altering the GSL level through genetic modification studies in B. rapa ssp. pekinensis. Copyright © 2015. Published by Elsevier SAS.

  8. Tissue distribution of the dystrophin-related gene product and expression in the mdx and dy mouse.

    Science.gov (United States)

    Love, D R; Morris, G E; Ellis, J M; Fairbrother, U; Marsden, R F; Bloomfield, J F; Edwards, Y H; Slater, C P; Parry, D J; Davies, K E

    1991-04-15

    We have previously reported a dystrophin-related locus (DMDL for Duchenne muscular dystrophy-like) on human chromosome 6 that maps close to the dy mutation on mouse chromosome 10. Here we show that this gene is expressed in a wide range of tissues at varying levels. The transcript is particularly abundant in several human fetal tissues, including heart, placenta, and intestine. Studies with antisera raised against a DMDL fusion protein identify a 400,000 Mr protein in all mouse tissues tested, including those of mdx and dy mice. Unlike the dystrophin gene, the DMDL gene transcript is not differentially spliced at the 3' end in either fetal muscle or brain.

  9. Studies of collective states in 160Dy and 188Os nuclei

    OpenAIRE

    Ibrahim, Noorddin

    1984-01-01

    Gamma rays following the decay of 160Tb and 188W were detected in both singles and coincidence in order to establish the energy level scheme of the two medium mass nuclei 160Dy and 1880s. Two large volume Ge(Li) detectors together with a plastic scintillation counter were incorporated in a Dual Parameter Energy-Time Spectrometer to measure the gamma-gamma coincidence spectra: the half-life of the first excited state of 160Dy was measured. An intrinsic Germanium detector was used to measure...

  10. Note: Simple means for selective removal of the 365 nm line from the Hg spectrum using Dy

    DEFF Research Database (Denmark)

    Vesborg, Peter Christian Kjærgaard; Chorkendorff, Ib; Brock-Nannestad, T.

    2011-01-01

    The emission spectrum of mercury has a notable line at about 365 nm under both low and medium-high pressure conditions. A simple filter based on a solution of dysprosium ions, Dy3+, is shown to be very useful for applications of Hg-light sources where this line is unwanted. The presented filter...... is cheap, robust, and stable towards degradation or bleaching - even under intense irradiation. The absorption spectrum for the Dy-filter is presented along with emission spectra from both low-pressure and high-pressure Hg-lamps to illustrate the utility of the technique under best-case and worst...

  11. First LHC results on coherent $J/\\psi$ photoproduction in ultra-peripheral Pb-Pb collisions at $\\sqrt{s_{NN}}$ = 2.76 TeV

    CERN Document Server

    Takaki, J D Tapia

    2012-01-01

    The first LHC measurement on ultra-peripheral heavy-ion collisions was carried out with the ALICE experiment. In this paper, ALICE results on exclusive J/psi studies in Pb-Pb collisions at sqrt(s_NN) = 2.76 TeV, in the rapidity region -3.6 < y < -2.6, are given. The coherent J/psi cross section was found to be dsigma/dy_coh_J/\\psi = 1.00 +/- 0.18 (stat) +0.24 -0.26 (syst) mb. These studies favour theoretical models that include strong modifications to the nuclear gluon density, also known as nuclear gluon shadowing.

  12. PbTe mechanosynthesis from PbO and Te

    Energy Technology Data Exchange (ETDEWEB)

    Rojas-Chavez, Hugo, E-mail: uu_gg_oo@yahoo.com.m [Centro de Investigacion e Innovacion Tecnologica - IPN, Cerrada de CECATI s/n, Col. Santa Catarina, Del. Azcapotzalco, CP 02250, Mexico D.F (Mexico); Diaz-de la Torre, Sebastian; Jaramillo-Vigueras, David; Plascencia, Gabriel [Centro de Investigacion e Innovacion Tecnologica - IPN, Cerrada de CECATI s/n, Col. Santa Catarina, Del. Azcapotzalco, CP 02250, Mexico D.F (Mexico)

    2009-08-26

    Experimental results concerning the mechanosynthesis (MSY), of PbTe from the PbO-Te powder system, at room temperature an atmospheric conditions are reported. XRD results for samples milled for and after 5.4 ks only show PbTe diffraction peaks; neither Te nor PbO or any other solid phase were detected. Particle size and morphology, was followed by SEM observations. Phase evolution and quantification was monitored by Rietveld refinements of the X-ray diffraction data. It was found that the use of lead oxide as a component of the mechanosynthesis system reduces milling time with respect to the Pb-Te metallic system with mechanical alloying.

  13. Phase Control of BR/SBR Blends by Silica Particles

    Science.gov (United States)

    Inai, Motoyuki; Aizawa, Seiji; Ito, Masayoshi

    A phase control of butadiene rubber (BR)/styrene-butadiene rubber (SBR) blends was examined by using silica particles. The phase structure of the blends was qualitatively evaluated from transmission electron microscope (TEM) observation and temperature dependence of mechanical tanδ. It was found that the temperature dependence of tanδ was dependent on the size of agglomerate formed by silica particles in the blend. The vulcanized blends with small agglomerates showed a single tanδ peak suggesting a pseudo-miscible state. The vulcanized blends with large agglomerates showed two tanδ peaks corresponding to the Tgs of BR and SBR. The mutual dissolution of BR and SBR phases above the UCST line where the vulcanization was carried out might be disturbed by large agglomerates formed by silica particles in the blends.

  14. Balloon-borne stratospheric BrO measurements: comparison with Envisat/SCIAMACHY BrO limb profiles

    Directory of Open Access Journals (Sweden)

    M. Dorf

    2006-01-01

    Full Text Available For the first time, results of four stratospheric BrO profiling instruments, are presented and compared with reference to the SLIMCAT 3-dimensional chemical transport model (3-D CTM. Model calculations are used to infer a BrO profile validation set, measured by 3 different balloon sensors, for the new Envisat/SCIAMACHY (ENVIronment SATellite/SCanning Imaging Absorption spectroMeter for Atmospheric CHartographY satellite instrument. The balloon observations include (a balloon-borne in situ resonance fluorescence detection of BrO (Triple, (b balloon-borne solar occultation DOAS measurements (Differential Optical Absorption Spectroscopy of BrO in the UV, and (c BrO profiling from the solar occultation SAOZ (Systeme d'Analyse par Observation Zenithale balloon instrument. Since stratospheric BrO is subject to considerable diurnal variation and none of the measurements are performed close enough in time and space for a direct comparison, all balloon observations are considered with reference to outputs from the 3-D CTM. The referencing is performed by forward and backward air mass trajectory calculations to match the balloon with the satellite observations. The diurnal variation of BrO is considered by 1-D photochemical model calculation along the trajectories. The 1-D photochemical model is initialised with output data of the 3-D model with additional constraints on the vertical transport, the total amount and photochemistry of stratospheric bromine as given by the various balloon observations. Total [Bry]=(20.1±2.5 pptv obtained from DOAS BrO observations at mid-latitudes in 2003, serves as an upper limit of the comparison. Most of the balloon observations agree with the photochemical model predictions within their given error estimates. First retrieval exercises of BrO limb profiling from the SCIAMACHY satellite instrument on average agree to around 20% with the photochemically-corrected balloon observations of the remote sensing instruments (SAOZ

  15. [Te8][NbOCl4]2 containing an infinite chain-like {[Te-Te-Te-(Te5)]2+}n polycation.

    Science.gov (United States)

    Feldmann, Claus; Freudenmann, Dominic

    2012-10-01

    The title compound, [Te(8)][NbOCl(4)](2), was obtained as translucent black crystals by reaction of elemental tellurium, niobium(V) chloride and niobium(V) oxychloride in the ionic liquid BMImCl (BMImCl is 1-butyl-3-methylimidazolium chloride). The synthesis was performed in argon-filled glass ampoules. According to X-ray structure analysis based on single crystals, the title compound crystallizes with triclinic lattice symmetry and consists of infinite {[Te(8)](2+)}(n) cations associated with pyramidal [NbOCl(4)](-) anions. The novel catena-octatellurium(2+) cation is composed of Te(5) rings that are linked via Te(3) units [Te-Te = 2.6455 (18)-2.8164 (19) Å]. The composition and purity of [Te(8)][NbOCl(4)](2) were further confirmed by energy-dispersive X-ray diffraction (EDX) analysis.

  16. Enhanced Flux-Pinning in Dy-Doped, MOD YBCO Films on RABiTS

    Energy Technology Data Exchange (ETDEWEB)

    Goyal, Amit [ORNL; Li, Jing [ORNL; Martin, Patrick M [ORNL; Gapud, Albert Agcaoili [ORNL; Specht, Eliot D [ORNL; Paranthaman, Mariappan Parans [ORNL; Li, X. [American Superconductor Corporation, Westborough, MA; Zhang, W. [American Superconductor Corporation, Westborough, MA; Kodenkandath, Thomas [American Superconductor Corporation, Westborough, MA; Rupich, Marty [American Superconductor Corporation, Westborough, MA

    2007-01-01

    Significant enhancements in flux-pinning were obtained for Dy-doped, YBCO films via a metal-organic deposition (MOD) process on rolling-assisted biaxially textured substrates (RABiTS). It has been reported previously that incorporation of excess rare-earth ions during the MOD process, results in improvement of Jc for H//c, however, a decrease in Jc for H//ab is observed. We report here that by altering the processing conditions the reduction in the magnitude of the current peak for H//ab can be minimized while significantly enhancing the random pinning at all field orientations. The result is a YBCO film with significantly reduced anisotropy compared to the typical YBCO films prepared by the MOD process. This is accomplished by incorporating both a high density of stacking faults and (Dy, Y)2O3 nanoparticles which result in the strong pinning for H//ab and a broad pinning peak for H//c respectively.

  17. Emergent order in the kagome Ising magnet Dy3Mg2Sb3O14.

    Science.gov (United States)

    Paddison, Joseph A M; Ong, Harapan S; Hamp, James O; Mukherjee, Paromita; Bai, Xiaojian; Tucker, Matthew G; Butch, Nicholas P; Castelnovo, Claudio; Mourigal, Martin; Dutton, S E

    2016-12-20

    The Ising model-in which degrees of freedom (spins) are binary valued (up/down)-is a cornerstone of statistical physics that shows rich behaviour when spins occupy a highly frustrated lattice such as kagome. Here we show that the layered Ising magnet Dy3Mg2Sb3O14 hosts an emergent order predicted theoretically for individual kagome layers of in-plane Ising spins. Neutron-scattering and bulk thermomagnetic measurements reveal a phase transition at ∼0.3 K from a disordered spin-ice-like regime to an emergent charge ordered state, in which emergent magnetic charge degrees of freedom exhibit three-dimensional order while spins remain partially disordered. Monte Carlo simulations show that an interplay of inter-layer interactions, spin canting and chemical disorder stabilizes this state. Our results establish Dy3Mg2Sb3O14 as a tuneable system to study interacting emergent charges arising from kagome Ising frustration.

  18. DyCoNet: a Gephi plugin for community detection in dynamic complex networks.

    Science.gov (United States)

    Kauffman, Julie; Kittas, Aristotelis; Bennett, Laura; Tsoka, Sophia

    2014-01-01

    Community structure detection has proven to be important in revealing the underlying organisation of complex networks. While most current analyses focus on static networks, the detection of communities in dynamic data is both challenging and timely. An analysis and visualisation procedure for dynamic networks is presented here, which identifies communities and sub-communities that persist across multiple network snapshots. An existing method for community detection in dynamic networks is adapted, extended, and implemented. We demonstrate the applicability of this method to detect communities in networks where individuals tend not to change their community affiliation very frequently. When stability of communities cannot be assumed, we show that the sub-community model may be a better alternative. This is illustrated through test cases of social and biological networks. A plugin for Gephi, an open-source software program used for graph visualisation and manipulation, named "DyCoNet", was created to execute the algorithm and is freely available from https://github.com/juliemkauffman/DyCoNet.

  19. Thermal stability and magnetocaloric properties of GdDyAlCo bulk metallic glasses

    Energy Technology Data Exchange (ETDEWEB)

    Liang, L. [State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing 100083 (China); Hui, X. [State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing 100083 (China)], E-mail: huixd01@hotmail.com; Chen, G.L. [State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing 100083 (China)

    2008-01-25

    Gd{sub 56-x}Dy{sub x}Al{sub 24}Co{sub 20} (x = 16, 20 and 22) bulk metallic glasses (BMGs) alloys with a diameter of 2, 3 and 3 mm, respectively, were prepared by using copper mold casting. These alloys exhibit higher values of the glass transition temperature, crystallization temperature, and activation energy of the glass transition and crystallization, compared with those of other known rare-earth-based BMGs. A maximum magnetic entropy changes of 15.78 J/(kg K) is obtained in Gd{sub 40}Dy{sub 16}Al{sub 24}Co{sub 20}, which is the maximal among all the bulk metallic glasses, and is much larger than those of the known crystalline magnetic refrigerant compound Gd{sub 5}Si{sub 2}Ge{sub 1.9}Fe{sub 0.1} and pure Gd metal. All the three BMG alloys have a broader temperature range of the entropy change peak, resulting in larger refrigerate capacities (RC) than those of conventional crystalline materials. The excellent magnetocaloric properties combining with high thermal stability make them an attractive candidate for magnetic refrigerants in the temperature range of 20-100 K.

  20. Non-collective high-spin states in /sup 148/Dy

    Energy Technology Data Exchange (ETDEWEB)

    Dines, E.L.

    1985-04-01

    General physical concepts regarding nuclear high-spin states are given. The high-spin states in /sup 148/Dy(Z = 66, N = 82) were produced via the reaction /sup 112/Cd(Pb-backed)(/sup 40/Ar,4n) at E/sub lab/ = 175, at the 88-inch Cyclotron at Lawrence Berkeley Laboratory. Methods for placing gates on various transitions above and below the 480 nsec isomer at 10/sup +/(known from previous work), as well as for calculating transition intensities and their associated errors, are given. Calculations of angular correlations for multiple ..gamma..-ray cascades, assuming non-zero-width distributions in m-states for some given spin state, were done and compared to experimental values. Analysis of RF - Ge and Ge - Ge TAC spectra for transitions above the 480 nsec isomer implied lifetimes of less than or equal to 5 nsec (except for the 327.2 keV transition). Using such analysis, some 19 new ..gamma..-ray transitions were discovered above the isomer, thereby extending the /sup 148/Dy level scheme up to spin I = 31 h-bar. Assignments of spins and parities for the new levels are made based on information obtained from angular correlations and the lifetime limits. Previous work on the 11 transitions below the 480 nsec isomer is confirmed.

  1. Structural and Ferroic Properties of La, Nd, and Dy Doped BiFeO3 Ceramics

    Directory of Open Access Journals (Sweden)

    Ashwini Kumar

    2015-01-01

    Full Text Available Polycrystalline samples of Bi0.8RE0.2FeO3 (RE = La, Nd, and Dy have been synthesized by solid-state reaction route. X-ray diffraction (XRD patterns of Bi0.8La0.2FeO3 and Bi0.8Nd0.2FeO3 were indexed in rhombohedral (R3c and triclinic (P1 structure, respectively. Rietveld refined XRD pattern of Bi0.8Dy0.2FeO3 confirms the biphasic (Pnma + R3c space groups nature. Raman spectroscopy reveals the change in BiFeO3 mode positions and supplements structural change with RE ion substitution. Ferroelectric and ferromagnetic loops have been observed in the Bi0.8RE0.2FeO3 ceramics at room temperature, indicating that ferroelectric and ferromagnetic ordering coexist in the ceramics at room temperature. The magnetic measurements at room temperature indicate that rare-earth substitution induces ferromagnetism and discerns large and nonzero remnant magnetization as compared to pristine BiFeO3.

  2. DyCoNet: a Gephi plugin for community detection in dynamic complex networks.

    Directory of Open Access Journals (Sweden)

    Julie Kauffman

    Full Text Available Community structure detection has proven to be important in revealing the underlying organisation of complex networks. While most current analyses focus on static networks, the detection of communities in dynamic data is both challenging and timely. An analysis and visualisation procedure for dynamic networks is presented here, which identifies communities and sub-communities that persist across multiple network snapshots. An existing method for community detection in dynamic networks is adapted, extended, and implemented. We demonstrate the applicability of this method to detect communities in networks where individuals tend not to change their community affiliation very frequently. When stability of communities cannot be assumed, we show that the sub-community model may be a better alternative. This is illustrated through test cases of social and biological networks. A plugin for Gephi, an open-source software program used for graph visualisation and manipulation, named "DyCoNet", was created to execute the algorithm and is freely available from https://github.com/juliemkauffman/DyCoNet.

  3. Nuclear Spin Isomers: Engineering a Et4 N[DyPc2 ] Spin Qudit.

    Science.gov (United States)

    Moreno-Pineda, Eufemio; Damjanović, Marko; Fuhr, Olaf; Wernsdorfer, Wolfgang; Ruben, Mario

    2017-08-07

    Two dysprosium isotopic isomers were synthesized: Et4 N[163 DyPc2 ] (1) with I=5/2 and Et4 N[164 DyPc2 ] (2) with I=0 (where Pc=phthalocyaninato). Both isotopologues are single-molecule magnets (SMMs); however, their relaxation times as well as their magnetic hystereses differ considerably. Quantum tunneling of the magnetization (QTM) at the energy level crossings is found for both systems via ac-susceptibility and μ-SQUID measurements. μ-SQUID studies of 1(I=5/2) reveal several nuclear-spin-driven QTM events; hence determination of the hyperfine coupling and the nuclear quadrupole splitting is possible. Compound 2(I=0) shows only strongly reduced QTM at zero magnetic field. 1(I=5/2) could be used as a multilevel nuclear spin qubit, namely qudit (d=6), for quantum information processing (QIP) schemes and provides an example of novel coordination-chemistry-discriminating nuclear spin isotopes. Our results show that the nuclear spin of the lanthanide must be included in the design principles of molecular qubits and SMMs. © 2017 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim.

  4. Examination of photon strength functions for Dy,164162 from radiative capture of resonance neutrons

    Science.gov (United States)

    Valenta, S.; Baramsai, B.; Bredeweg, T. A.; Couture, A.; Chyzh, A.; Jandel, M.; Kroll, J.; Krtička, M.; Mitchell, G. E.; O'Donnell, J. M.; Rusev, G.; Ullmann, J. L.; Walker, C. L.

    2017-11-01

    The γ rays following radiative neutron capture on Dy,163161 targets were measured with the highly segmented γ -ray calorimeter Detector for Advanced Neutron Capture Experiments at the Los Alamos Neutron Science Center. The γ -ray energy spectra for different multiplicities were gathered for tens of s -wave resonances of both possible spins in each nucleus. Analysis of these spectra within the statistical model enabled us to draw conclusions about dipole photon strength functions with emphasis on the scissors mode. The photon strength functions best describing Dy data are very similar to previously published results on even-even Gd isotopes. It was shown that the scissors mode plays a significant role in the decay of highly excited states up to the neutron separation energy. Measurement of multiple resonances allowed us to assess the fluctuations of experimental spectra and to compare the fluctuations with simulated ones. The size of measured fluctuations is on average smaller than predicted from simulations. However, the results are puzzling as the difference between simulations within the statistical model and experiment is not consistent for both nuclei.

  5. Stratospheric BrONO2 observed by MIPAS

    Directory of Open Access Journals (Sweden)

    H. Fischer

    2009-03-01

    Full Text Available The first measurements of stratospheric bromine nitrate (BrONO2 are reported. Bromine nitrate has been clearly identified in atmospheric infrared emission spectra recorded with the Michelson Interferometer for Passive Atmospheric Sounding (MIPAS aboard the European Envisat satellite, and stratospheric concentration profiles have been determined for different conditions (day and night, different latitudes. The BrONO2 concentrations show strong day/night variations, with much lower concentrations during the day. Maximum volume mixing ratios observed during night are 20 to 25 pptv. The observed concentration profiles are in agreement with estimations from photochemical models and show that the current understanding of stratospheric bromine chemistry is generally correct.

  6. Skandaalin vaikutus brändin imagoon - Case Audi

    OpenAIRE

    Puntalo, Ville-Veikko

    2016-01-01

    Opinnäytetyössä tutkittiin Volkswagenin päästöhuijausskandaalin vaikutusta Audi-brändin imagoon. Tutkimuksessa pyrittiin selvittämään onko ennakoitavissa mahdollisia myyntitulosten muutoksia ja johtuivatko ne kyseisestä skandaalista. Opinnäytetyön teoriaosuudessa perehdyttiin ostokäyttäytymisen prosessiin, brändin rakentumiseen, positiivisen maineen saavuttamiseen ja tunnettuihin yritysmaailman skandaaleihin. Lisäksi käytiin läpi Volkswagen päästöskandaalin taustaa sekä sen seurauksia. ...

  7. Atmospheric test of the J(BrONO2/kBrO+NO2 ratio: implications for total stratospheric Bry and bromine-mediated ozone loss

    Directory of Open Access Journals (Sweden)

    S. Kreycy

    2013-07-01

    Full Text Available We report on time-dependent O3, NO2 and BrO profiles measured by limb observations of scattered skylight in the stratosphere over Kiruna (67.9° N, 22.1° E on 7 and 8 September 2009 during the autumn circulation turn-over. The observations are complemented by simultaneous direct solar occultation measurements around sunset and sunrise performed aboard the same stratospheric balloon payload. Supporting radiative transfer and photochemical modelling indicate that the measurements can be used to constrain the ratio J(BrONO2/kBrO+NO2, for which at T = 220 ± 5 K an overall 1.7 (+0.4 −0.2 larger ratio is found than recommended by the most recent Jet Propulsion Laboratory (JPL compilation (Sander et al., 2011. Sensitivity studies reveal the major reasons are likely to be (1 a larger BrONO2 absorption cross-section σBrONO2, primarily for wavelengths larger than 300 nm, and (2 a smaller kBrO+NO2 at 220 K than given by Sander et al. (2011. Other factors, e.g. the actinic flux and quantum yield for the dissociation of BrONO2, can be ruled out. The observations also have consequences for total inorganic stratospheric bromine (Bry estimated from stratospheric BrO measurements at high NOx loadings, since the ratio J(BrONO2/kBrO+NO2 largely determines the stratospheric BrO/Bry ratio during daylight. Using the revised J(BrONO2/kBrO+NO2 ratio, total stratospheric Bry is likely to be 1.4 ppt smaller than previously estimated from BrO profile measurements at high NOx loadings. This would bring estimates of Bry inferred from organic source gas measurements (e.g. CH3Br, the halons, CH2Br2, CHBr3, etc. into closer agreement with estimates based on BrO observations (inorganic method. The consequences for stratospheric ozone due to the revised J(BrONO2/kBrO+NO2 ratio are small (maximum −0.8%, since at high NOx (for which most Bry assessments are made the enhanced ozone loss by overestimating Bry is compensated for by the suppressed ozone loss due to the

  8. 75 FR 51693 - Airworthiness Directives; Rolls-Royce Deutschland Ltd & Co KG Models BR700-710A1-10; BR700-710A2...

    Science.gov (United States)

    2010-08-23

    ... Directives; Rolls-Royce Deutschland Ltd & Co KG Models BR700-710A1-10; BR700-710A2-20; and BR700-710C4-11...-2251. Contact Rolls-Royce Deutschland Ltd & Co KG, Eschenweg 11, Dahlewitz, 15827 Blankenfelde-Mahlow..., notified us that an unsafe condition may exist on Rolls-Royce Deutschland Ltd & Co KG Models BR700-710A1-10...

  9. Thermoluminescent characteristics of CaSO{sub 4}:Dy+PTFE irradiated with high energy electron beams; Caracteristicas termoluminiscentes del CaSO{sub 4}:Dy+PTFE irradiado con haces de electrones de alta energia

    Energy Technology Data Exchange (ETDEWEB)

    Alvarez, R.; Rivera, T.; Calderon, J. A.; Jimenez, Y. [IPN, Centro de Investigacion en Ciencia Aplicada y Tecnologia Avanzada, Av. Legaria 694, Col. Irrigacion, 11500 Mexico D. F. (Mexico); Rodriguez, J. [Hospital General de Mexico, Dr. Balmis 148, Col. Doctores, 06726 Mexico D. F. (Mexico); Oviedo, O. [Centro Medico ABC, Sur 136 No. 116, Col. Las Americas, 01120 Mexico D. F. (Mexico); Azorin, J., E-mail: chagua@hotmail.com [Universidad Autonoma Metropolitana, Unidad Iztapalapa, Av. San Rafael Atlixco 186, 09340 Mexico D. F. (Mexico)

    2011-10-15

    In the present work thermoluminescent response of dysprosium doped calcium sulfate embedded in polytetrafluorethylene (CaSO{sub 4}:Dy+PTFE) under high electron beam irradiations from linear accelerator for clinical applications was investigated. The irradiations were carried out using high electron beams (6 to 18 MeV) from a linear accelerator Varian, C linac 2300C/D, for clinical practice purpose. The electron irradiations were obtained by using the water solid in order to guarantee electronic equilibrium conditions. Field shaping for electron beams was obtained with electron cones. Glow curve and other thermoluminescent characteristics of CaSO{sub 4}:Dy+PTFE were conducted under high electron beams irradiations. The thermoluminescent response of the pellets showed and intensity peak centered at around 235 C. Thermoluminescent response of CaSO{sub 4}:Dy+PTFE as a function of high electron absorbed dose showed a linearity in a wide range. To obtain reproducibility characteristic, a set of pellets were exposed repeatedly for the same electron absorbed dose. The results obtained in this study can suggest the applicability of CaSO{sub 4}:Dy+PTFE pellets for high electron beam dosimetry, provided fading is correctly accounted for. (Author)

  10. Product analysis and kinetics of Br-initiated gas-phase oxidation of dimethyl sulphide; Produktanalyse und Kinetik der Br-initiierten Gasphasenoxidation von Dimethylsulfid

    Energy Technology Data Exchange (ETDEWEB)

    Becker, K.H.; Maurer, T.

    1996-07-01

    High Br concentrations in maritime environments may render the reaction between Br radicals and dimethyl sulphide an important process. According to the literature this system has as yet not been studied with a mind to clarifying the reaction mechanisms and performing a product analysis. Thus, for example, the decomposition of the DMS-Br adduct remains to be clarified. The purpose of the present study was therefore to examine the reaction between dimethyl sulphide and Br radicals and so gain information on the decomposition mechanism. This implied a determination of the velocity constant and a product analysis of the reaction between Br radicals and dimethyl sulphide. In addition the velocity constant of the reaction between Br radicals and dimethylsulphoxide (a consequent product of DMS oxidation) was to be determined. (orig.) [Deutsch] Hohe Br-Konzentrationen in maritimen Gebieten machen die Reaktion von Br-Radikalen mit Dimethylsulfid moeglicherweise zu einem wichtigen Prozess. In der Literatur fehlen eingehende Untersuchungen dieses Systems hinsichtlich der Aufklaerung der Reaktionsmechanismen und der Produktanalyse. So ist zum Beispiel der Zerfall des DMS-Br-Adduktes nicht aufgeklaert. Aus diesen Gruenden soll im Rahmen dieser Arbeit die Reaktion von Dimethylsulfid mit Br-Radikalen untersucht werden, um Informationen ueber den Abbaumechanismus zu erhalten. Darunter fallen die Bestimmung der Geschwindigkeitskonstanten und die Produktanalyse der Reaktion von Br-Radikalen mit Dimethylsulfid. Zusaetzlich soll die Geschwindigkeitskonstante der Reaktion vom Br-Radikalen mit Dimethylsulfoxid (einem Folgeprodukt der DMS-Oxidation) bestimmt werden. (orig.)

  11. Aagesta-BR3 Decommissioning Cost. Comparison and Benchmarking Analysis

    Energy Technology Data Exchange (ETDEWEB)

    Varley, Geoff [NAC International, Henley on Thames (United Kingdom)

    2002-11-01

    This report presents the results of decommissioning cost analyses focusing on discrete working packages within the decommissioning program of the BR3 reactor in Mol, Belgium and comparison of them with cost estimate data for the Aagesta research reactor in Sweden. The specific BR3 work packages analysed were: Primary coolant piping decontamination; Primary coolant piping dismantling; Vulcain reactor internals dismantling; Westinghouse reactor internals dismantling; Reactor vessel dismantling. The main conclusions to be drawn from the analyses are that: The fixed costs related to decontamination and dismantling activities generally are a very important part of the overall resources needed to execute the work, with the Reactor Pressure Vessel (RPV) seemingly being significantly more demanding than other major components. Cutting activities tend to need something like 150 to 200 labour hours per m{sup 2} of reactor equipment dismantled. Fixed investment costs to set up the equipment needed to cut up major vessels or internals appear to be in the range of MSEK 4 to 8. Consumables costs vary according to the nature of the equipment being dismantled. The thicker the metal being cut, the higher the attrition rate for things such as cutting blades. The range of consumables costs at BR3 have been in the range of MSEK 0.1 to 0.2/m{sup 2} dismantled. The extent of detailed information available in the 1996 Aagesta estimate is not sufficient to enable a full comparison with the BR3 decommissioning results. A global first comparison has been attempted by summing the resources expended on the BR3 work packages described in this report with the combined dismantling data presented in the 1996 Aagesta cost estimate report. Very broadly the cost of decontamination plus dismantling of the main process equipment at Aagesta appears to be in the order of MSEK 70, of which MSEK 4 is labour on preparatory/planning work, MSEK 40 is labour on actual decontamination and dismantling and MSEK

  12. Development of the web-based Spanish and Catalan versions of the Euroqol 5D-Y (EQ-5D-Y) and comparison of results with the paper version.

    Science.gov (United States)

    Robles, Noemí; Rajmil, Luis; Rodriguez-Arjona, Dolors; Azuara, Marta; Codina, Francisco; Raat, Hein; Ravens-Sieberer, Ulrike; Herdman, Michael

    2015-06-03

    The objectives of the study were to develop web-based Spanish and Catalan versions of the EQ-5D-Y, and to compare scores and psychometric properties with the paper version. Web-based and paper versions of EQ-5D-Y were included in a cross-sectional study in Palafolls (Barcelona), Spain and administered to students (n = 923) aged 8 to 18 years from 2 primary and 1 secondary school and their parents. All students completed both the web-based and paper versions during school time with an interval of at least 2 h between administrations. The order of administration was randomized. Participants completed EQ-5D-Y, a measure of mental health status (the Strengths and Difficulties Questionnaire), and sociodemographic variables using a self-administered questionnaire. Parents questionnaire included parental level of education and presence of chronic conditions in children. Missing values, and floor and ceiling effects were compared between versions. Mean score differences were computed for the visual analogue scale (VAS). Percentage of agreement, kappa index (k) and intraclass correlation coefficient (ICC) were computed to analyze the level of agreement between web-based and paper versions on EQ-5D-Y dimensions and VAS. Known groups validity was analyzed and compared between the two formats. Participation rate was 77 % (n = 715). Both formats of EQ-5D-Y showed low percentages of missing values (n = 2, and 4 to 9 for web and paper versions respectively), and a high ceiling effect by dimension (range from 79 % to 96 %). Percent agreement for EQ-5D-Y dimensions on the web and paper versions was acceptable (range 89 % to 97 %), and k ranged from 0.55 (0.48-0.61, usual activities dimension) to 0.75 (0.68-0.82, mobility dimension). Mean score difference on the VAS was 0.07, and the ICC for VAS scores on the two formats was 0.84 (0.82-0.86). Both formats showed acceptable ability to discriminate according to self-perceived health, reporting chronic conditions, and

  13. Heterojunction double dumb-bell Ag₂Te-Te-Ag₂Te nanowires.

    Science.gov (United States)

    Som, Anirban; Pradeep, T

    2012-08-07

    Growth of isolated axial heterojunction nanowires by a solution phase growth process is reported. The dumb-bell shaped nanowires contain two silver telluride sections at the extremes joined by a tellurium section. Reaction of silver nitrate with tellurium NWs in aqueous solution at a molar ratio of 1 : 1 leads to the formation of amorphous partially silver reacted Te NWs. Low temperature (75 °C) solution phase annealing of these silver deficient NWs results in phase segregation producing crystalline Ag(2)Te and Te phases with clear phase boundaries along the wire axis. Structural characterization of these dumb-bell shaped NWs was performed with different microscopic and spectroscopic tools. Solution phase silver concentration over the course of annealing indicated leaching of silver into the solution during the formation of biphasic NWs. Similar Ag : Te ratios were observed in both partially silver reacted Te NWs and phase segregated Ag(2)Te-Te-Ag(2)Te NWs and this was attributed to redeposition of leached silver on the amorphous NW tips which eventually resulted in complete phase segregation. Successful integration of different chemical components in single NWs is expected to open up new application possibilities as physical and chemical properties of the heterostructure can be exploited.

  14. Test of the X(5) symmetry in {sup 156}Dy and {sup 178}Os by measurement of electromagnetic transition probabilities; Test der X(5)-Symmetrie in {sup 156}Dy und {sup 178}Os durch Messung elektromagnetischer Uebergangswahrscheinlichkeiten

    Energy Technology Data Exchange (ETDEWEB)

    Moeller, O.

    2005-07-01

    This work reports on results from two Recoil-Distance-Doppler-Shift lifetime measurements of excited states in {sup 155}Dy and {sup 178}Os. The experiments were carried out at the GASP spektrometer of the Laboratori Nazional i di Legnaro in combination with the Cologne plunger apparatus. The main purpose of the performed experiments was to test the predictions of the X(5) critical point symmetry in these two nuclei. In {sup 156}Dy and {sup 178}Os 29 lifetimes of excited states were derived using the Differential-Decay-Curve method. In weaker reaction channels the nuclei {sup 155}Dy, {sup 157}Dy and {sup 177}Os were populated. In these nuclei 32 additional lifetimes were measured, most of them for the first time. In order to calculate absolute transition probabilities from the measured lifetimes of the first excited band in {sup 156}Dy, essential branching ratios were derived from the measured data with a very small systematic error (<5%). The most important results can be summarized as mentioned below: Lifetimes measured in the first excited band, confirm that this nucleus can be located close to the critical point X(5). With model calculations, special criteria of the X(5) model were found that can be used to identify other X(5)-like nuclei. Using these criterias a new region of X(5)-like nuclei could be suggested within the osmium isotopes in the A=180 mass region. The measured lifetimes in {sup 178}Os confirm the consistency of a X(5) description in these nuclei. A comparision with the well established X(5)-like nuclei in the N=90 isotones gives an agreement with the X(5) description of at least the same quality. (orig.)

  15. Phase transition and dielectric study in Ba0⋅95Dy0⋅05TiO3 ceramic

    Indian Academy of Sciences (India)

    Administrator

    95Dy0⋅05TiO3 ceramic has been studied in the temperature range of 100–350 K at the frequencies, 1 kHz, 10 kHz, 100 kHz and. 1 mHz. Diffuse phase transition and frequency dispersion is observed in the permittivity-vs-temperature plots.

  16. Structure of Thermobifida fusca DyP-type peroxidase and activity towards Kraft lignin and lignin model compounds.

    Science.gov (United States)

    Rahmanpour, Rahman; Rea, Dean; Jamshidi, Shirin; Fülöp, Vilmos; Bugg, Timothy D H

    2016-03-15

    A Dyp-type peroxidase enzyme from thermophilic cellulose degrader Thermobifida fusca (TfuDyP) was investigated for catalytic ability towards lignin oxidation. TfuDyP was characterised kinetically against a range of phenolic substrates, and a compound I reaction intermediate was observed via pre-steady state kinetic analysis at λmax 404 nm. TfuDyP showed reactivity towards Kraft lignin, and was found to oxidise a β-aryl ether lignin model compound, forming an oxidised dimer. A crystal structure of TfuDyP was determined, to 1.8 Å resolution, which was found to contain a diatomic oxygen ligand bound to the heme centre, positioned close to active site residues Asp-203 and Arg-315. The structure contains two channels providing access to the heme cofactor for organic substrates and hydrogen peroxide. Site-directed mutant D203A showed no activity towards phenolic substrates, but reduced activity towards ABTS, while mutant R315Q showed no activity towards phenolic substrates, nor ABTS. Copyright © 2016 Elsevier Inc. All rights reserved.

  17. Effects of Ga doping on the electric and magnetic properties of DyMn1-xGaxO3

    Science.gov (United States)

    Li, S. Z.; Chen, S. S.; Wang, X. Z.; Liu, J. M.

    2018-02-01

    Ga3+ for Mn3+ substitution in multiferroic DyMn1-xGaxO3(x = 0, 0.02, 0.05, 0.1, 0.2, 0.3 and 0.4) has been performed to study the change on Mn3+ ordering, which also influences on the ordering of Dy3+. The samples are pure and their dielectric constant, electric polarization and magnetic properties have been investigated. When the content of Ga3+ increases above 0.1, multiferroic properties completely disappear. These results indicate that Ga3+ for Mn3+ substitution in DyMnO3 bulk can reduce the exchange interactions of JMn-Mn, JDy-Mn and the bond angle of Mn-O-Mn, while the electric polarization is observed to decrease rapidly, even for small Ga doping, and the anomaly at low T in P(T) associated with the Dy ordering is no longer observed for x = 0.05.

  18. Broadband ∼3 μm mid-infrared emission in Dy3+/Yb3+ co-doped germanate glasses

    Science.gov (United States)

    Shen, Lingling; Wang, Ning; Dou, Aoju; Cai, Yangjian; Tian, Ying; Huang, Feifei; Xu, Shiqing; Zhang, Junjie

    2018-01-01

    The Dy3+/Yb3+ co-doped germanate glasses with good thermal stability have been prepared by the conventional melt quenching method. The J-O intensity parameters and radiative properties such as spontaneous transition probilities (Arad), fluorescence branching ratios (β) and radiative lifetimes (τrad) were investigated according to the absorption spectrum based on Judd-Ofelt theory. An intense emission around ∼3 μm with the FWHM reaching to 322 nm was obtained in present glasses excited by 980 nm LD. The high spontaneous transition probability (63.94 s-1), large emission cross section (6.0 × 10-21 cm2) and superior gain performance corresponding to the Dy3+: 6H13/2 → 6H15/2 transition were obtained. Moreover, the energy transfer mechanism was analyzed qualitatively, and it was found that the energy transfer from Yb3+: 2F5/2 to Dy3+: 6H5/2 level could be quite efficient. Hence, the results indicated that the prepared Dy3+/Yb3+ co-doped germanate glass could be a potential candidate for ∼3 μm mid-infrared solid state lasers.

  19. High-efficient, bicolor-emitting GdVO{sub 4}:Dy{sup 3+} phosphor under near ultraviolet excitation

    Energy Technology Data Exchange (ETDEWEB)

    Lu, Jinjin; Zhou, Jia [Department of Chemical Engineering, Inner Mongolia Vocational College of Chemical Engineering, Hohhot, Inner Mongolia 010070 (China); Jia, Huayu [Key Lab of Advanced Transducers and Intelligent Control System of Ministry of Education, College of Physics and Optoelectronics, Taiyuan University of Technology, Taiyuan 030024 (China); Tian, Yue, E-mail: tianyue@tyut.edu.cn [Key Lab of Advanced Transducers and Intelligent Control System of Ministry of Education, College of Physics and Optoelectronics, Taiyuan University of Technology, Taiyuan 030024 (China)

    2015-11-01

    Bicolor emitting GdVO{sub 4}:Dy{sup 3+} phosphor with short columniation-shape was prepared via a simple co-precipitation process. The optimal doping concentration for obtaining maximal luminescent intensity was confirmed to be 0.3 mol% and the electric dipole–dipole interaction is responsible for concentration quenching of Dy{sup 3+} emission in GdVO{sub 4} phosphor. In order to evaluate the luminescent performance of as-prepared phosphor, the luminescent efficiency and color coordinates were studied. The results show that luminescent efficiency of this phosphor is very high under near UV excitation and twice times higher than commercial Y{sub 2}O{sub 2}S:Eu{sup 3+} phosphor. In addition, the color coordinates for optimal Dy{sup 3+} concentration are (0.339, 0.379), which are close to equal energy point. Therefore, the GdVO{sub 4}:Dy{sup 3+} phosphor may have potential application for solid state lighting.

  20. Thin CaSO{sub 4}:Dy thermoluminescent dosimeters for calibration of {sup 90}Sr+{sup 90}Y applicators

    Energy Technology Data Exchange (ETDEWEB)

    Antonio, Patricia L. [Instituto de Pesquisas Energeticas e Nucleares, Comissao Nacional de Energia Nuclear, Av. Prof. Lineu Prestes, 2242, 05508-000, Sao Paulo, SP (Brazil); Oliveira, Mercia L. [Centro Regional de Ciencias Nucleares, Comissao Nacional de Energia Nuclear, Av. Prof. Luis Freire, 200, 50740-540, Recife, PE (Brazil); Caldas, Linda V.E., E-mail: lcaldas@ipen.br [Instituto de Pesquisas Energeticas e Nucleares, Comissao Nacional de Energia Nuclear, Av. Prof. Lineu Prestes, 2242, 05508-000, Sao Paulo, SP (Brazil)

    2012-04-15

    Clinical applicators are used in brachytherapy to treat superficial lesions of skin and eye. They should be periodically calibrated according to quality control programs and international recommendations. Thin CaSO{sub 4}:Dy thermoluminescent dosimeters were used to calibrate various applicators with a dermatological applicator as a reference. The obtained absorbed dose rates were compared with those quoted in their calibration certificates. Depth-dose curves were constructed for all the applicators. A mail dosimetry system was developed for calibration of clinical applicators. - Highlights: Black-Right-Pointing-Pointer Absorbed dose rates were obtained for {sup 90}Sr+{sup 90}Y applicators using CaSO{sub 4}:Dy pellets. Black-Right-Pointing-Pointer Depth-dose curves were obtained for all studied applicators. Black-Right-Pointing-Pointer CaSO{sub 4}:Dy dosimeters presented satisfactory results in all realized tests. Black-Right-Pointing-Pointer A mail dosimetry system was developed with CaSO{sub 4}:Dy pellets.

  1. Thermoluminescence of LaAlO{sub 3}; Termoluminescencia de LaAlO{sub 3}:Dy

    Energy Technology Data Exchange (ETDEWEB)

    Morales H, A.; Zarate M, J. [Universidad Michoacana de San Nicolas de Hidalgo, Instituto de Investigacion en Metalurgia y Materiales, Ciudad Universitaria, Edif. U, 58060 Morelia, Michoacan (Mexico); Rivera M, T. [IPN, Centro de Investigacion en Ciencia Aplicada y Tecnologia Avanzada, Av. Legaria 694, 11500 Mexico D. F. (Mexico); Azorin N, J., E-mail: feyo_yo@hotmail.com [Universidad Autonoma Metropolitana, Unidad Iztapalapa, Av. San Rafael Atlixco 186, Col. Vicentina, 09340 Mexico D. F. (Mexico)

    2015-10-15

    In this paper the thermoluminescent properties of doped lanthanum aluminate (LaAlO{sub 3}) with dysprosium ion (Dy) were studied. The thermoluminescence characteristics in the samples were obtained using an ultraviolet radiation of 220 nm. The LaAlO{sub 3}:Dy samples were prepared by the modified Pechini method (Spray Dryer). The structural and morphological characterization was obtained by X-ray diffraction (XRD) and scanning electron microscopy (Sem) techniques respectively. The size particle composing the agglomerate was determined by Sem, agglomerated particles composed size of 2μm were observed. The thermoluminescence response of LaAlO{sub 3}:Dy was compared with that obtained with the undoped sample. Thermoluminescence brightness curves of LaAlO{sub 3}:Dy showed a peak centered at 185 grades C. Sensitivity of doped sample was greater, about 100 times compared with the undoped sample. Thermoluminescence response in function of the wavelength showed a maximum at 220 nm. Also the fading in thermoluminescence response was studied. (Author)

  2. Rayleigh scattering of 66Dy-K X-rays in elements with 22 ≤ Z ≤ 90

    Science.gov (United States)

    Singh, Gurjot; Upmanyu, Arun; Singh, Prem; Kainth, H. S.; Shahi, J. S.; Singh, Ranjit; Kumar, Sanjeev

    2017-12-01

    Rayleigh scattering differential cross sections for the 45.2 keV (66Dy Kα2), 46.0 keV (66Dy Kα1) and 52.1 keV (66Dy Kβ1,3) X-rays have been measured at 139° in 44 elements with 22 ≤ Z ≤ 90. The measurements were performed using a radiation source consisting of an annular 66Dy foil excited by the 59.54 keV γ-ray photons from 241Am radioactive source. Intensity of the incident photons along with other geometrical factors were determined by measuring the isotropically emitted K X-ray yields from targets and knowledge of the corresponding K X-ray fluorescence cross sections. The measured Rayleigh scattering cross sections are compared with those based on various form factor formalisms and the state-of-the-art S-matrix calculations to differentiate between their relative efficacies. The scattering cross sections based on the modified form factor (MF) formalism exhibit large deviations for the elements with electron binding energies in vicinity of the incident photon energy, and these deviations smooth out on inclusion of the anomalous scattering factors (ASFs) to the MF values. The cross sections based on the MF after including ASF's are found to be on an average higher by 8% as compared to the measured ones. The S-matrix values exhibit in general good agreement with the measured cross sections for the elements with 22 ≤ Z ≤ 90.

  3. Redetermination of the Crystal Structure of Al2Br6

    DEFF Research Database (Denmark)

    Berg, Rolf W.; Poulsen, Finn W.; Nielsen, Kurt

    1997-01-01

    . In accordance with previous results, the structure belongs to the monoclinic space group P2(1)/a, no. 14, C-2h(5), with a = 10.301(4), b = 7.095(2), c = 7.525(3) Angstrom, and beta = 96.44(3)degrees, and with two Al2Br6 molecules per unit cell. The single crystal was refined to R = 0.0746. Rather similar......The structure of aluminium bromide has been reinvestigated by X-ray diffraction in three different ways: (a) on a single crystal grown in a glass capillary, (b) on powder in a Debye-Scherrer glass capillary and (c) on an area of powder placed in a protective container for Bragg-Brentano geometry...... structural results were obtained from full-profile Rietveld refinements of powder data [goodness of fit = 1.38 and 2.54 for (b) and (c), respectively]. The Al2Br6 molecule consists of two edge-sharing, almost regular AlBr4 tetrahedra. The Al-Br bond distances are in the range 2.21-2.42 Angstrom...

  4. Fragment production in 16 O· 80 Br reaction within dynamical ...

    Indian Academy of Sciences (India)

    ... Public Lectures · Lecture Workshops · Refresher Courses · Symposia. Home; Journals; Pramana – Journal of Physics; Volume 59; Issue 1. Fragment production in 16O + 80Br reaction within dynamical microscopic theory. Rajeev K Puri Jaivir Singh Suneel Kumar. Research Articles Volume 59 Issue 1 July 2002 pp 19-31 ...

  5. (KNa)Br phosphor for ionizing radiation dosimetry

    Indian Academy of Sciences (India)

    Lyoluminescence; γ-ray dose; radiation dosimetry; phosphor; (KNa)Br. 1. Introduction. The measurement of radiation dose has become a science of ever increasing importance due to the estimation of risk and benefits inherent to the uses and to the exposure of ionizing radiation. When strongly energized, crystals are ...

  6. Overexpression of BrSAC1 encoding a phosphoinositide ...

    African Journals Online (AJOL)

    The full length gene (BrSAC1; GenBank accession no., GU434275) contained 1999 base pairs (bp), with an open reading frame of 1785 bp, encoding a polypeptide of 594 amino acids with a predicted molecular weight of 65 kDa, including a putative N-terminal signal peptide (the signal peptide counted within the 594 ...

  7. Monika Elisabeth Bründl, Lexikalische Dynamik – Kognitiv ...

    African Journals Online (AJOL)

    Information Technology

    Key concepts are the mental lexicon, metaphor and metonymy as central processes in the creation of new lexical units (as defined by Cruse 1986: 77), and iconicity as the cognitive answer to the structural tenet of the arbitrariness of the linguistic sign. Bründl argues that the cognitive approach so far has been mainly applied.

  8. Narva kant vajab oma brändi / Esko Passila

    Index Scriptorium Estoniae

    Passila, Esko

    2007-01-01

    Autor leiab, et Ida-Virumaa peaks looma ühtse tugeva brändi, mille alusel tulevikuotsuseid teha. See peaks tooma välja soodsa asukoha eelised, võimalused, tööjõu kättesaadavuse, kasutusvalmid maa-alad, hinnad jne.

  9. Overexpression of BrSAC1 encoding a phosphoinositide ...

    African Journals Online (AJOL)

    2013-04-10

    Apr 10, 2013 ... Key words: Abiotic stress, Brassica rapa, phosphoinositide phosphatase, transgenic plant. INTRODUCTION. Plant growth is strongly ... specific primers for the analysis of BrSAC1 expression in germinating seeds were: ..... Ministry for Food, Agriculture, Forestry and Fisheries,. Republic of Korea and 2012 ...

  10. Experimental determination of B R-12 attenuation coefficients utilizing photon spectrometry;Deteminacao experimental de coeficientes de atenuacao de BR-12 atraves de espectrometria de fotons

    Energy Technology Data Exchange (ETDEWEB)

    Almeida Junior, Jose N.; Terini, Ricardo A. [Pontificia Universidade Catolica de Sao Paulo (PUC-SP), Sao Paulo, SP (Brazil). Dept. de Fisica; Herdade, Silvio B. [Universidade de Sao Paulo (USP), SP (Brazil). Inst. de Eletrotecnica e Energia (IEE). Secao Tecnica de Desenvolvimento Tecnologico em Saude

    2009-07-01

    In tests for quality assurance in mammography, it is common to use breast phantoms, with different compositions. One of the most used is the BR-12 phantom. There are few published experimental data on the attenuation of BR-12. Generally, the available attenuation coefficients are calculated from the composition of the coefficients determined for its components. In this work, the spectrometric method was used, with a CdTe detector, for X- and {gamma}-rays from radioactive sources of {sup 133}Ba and {sup 241}Am. The spectra of direct and attenuated by 0.5 cm of BR-12 beams were measured. From the ratio of intensities obtained for these radiations, it was possible to determine values of the attenuation coefficients from Beer's law. Results show coherence with previous data. The values of such coefficients are useful, for example, for calculations of absorbed dose (in BR-12), which have been made on other research activities of this group. (author)

  11. Broadband 2.9 μm emission and high energy transfer efficiency in Er3+/Dy3+ co-doped fluoroaluminate glass

    Science.gov (United States)

    Wang, Tao; Huang, Feifei; Ren, Guangyu; Cao, Wenqian; Tian, Ying; Lei, Ruoshan; Zhang, Junjie; Xu, Shiqing

    2018-01-01

    2.9 μm fluorescence properties and energy transfer mechanism in our prepared Er3+/Dy3+ co-doped fluoroaluminate glass (AYFT) have been investigated in this paper. As far as we know, it is the first time to report a broadband emission extending from 2500 to 3100 nm with a full width at half maximum (FWHM) of 270 nm obtained in Er3+/Dy3+ co-doped fluoroaluminate glass under 980 nm pump. The large spontaneous transition probability (59.46 s-1) calculated based on the Judd-Ofelt theory indicates the intensive Dy3+: 6H13/2 → 6H15/2 transition which has happened to coincide with the emission spectra. Moreover, the high energy transfer efficiencies of Er3+: 4I13/2 to Dy3+: 6H11/2 (90.3%) and Er3+: 4I11/2 to Dy3+: 6H5/2 (85.1%) further confirmed the efficient population inversion of Dy3+: 2.9 μm emission. This present work suggests that Er3+/Dy3+ co-doped fluoroaluminate glass can be a potential candidate for mid-infrared broadband integrated amplifier.

  12. Color-tunable emission and energy transfer in Tm3+/Dy3+/Sm3+ tri-doped phosphate glass for white light emitting diodes

    Science.gov (United States)

    Yu, Yin; Song, Feng; Ming, Chengguo; Liu, Jiadong; Li, Wei; Liu, Yanling; Zhao, Hongyan

    2013-08-01

    Re3+ (Re3+=Tm3+, Dy3+, Sm3+) ions doped phosphate glasses for white light emitting diodes (W-LEDs) are successfully prepared by the high-temperature melting method. The luminescence properties of the glasses were characterized by the emission and excitation spectra. When excited by ultraviolet light Tm3+ ions single doped, Dy3+ ions single doped, and Sm3+ ions single doped phosphate glass emit blue, green and red light, which give the characteristic transitions of Tm3+ ions (1D2→3F4), Dy3+ ions (4F9/2→6H13/2,15/2), and Sm3+ ions (4G5/2→6H7/2,9/2), respectively. Moreover, there exists simultaneous luminescence of Tm3+, Dy3+, Sm3+ ions individually when co-doping them in the single phased phosphate glass (for example, Tm3+/Sm3+ ions co-doped; Dy3+/Sm3+ ions co-doped; Dy3+/Tm3+ ions co-doped; Tm3+/Dy3+/Sm3+ ions tri-doped systems), which is beneficial to tune the emission colors. Under the 360 nm excitation, the CIE coordinates of Tm3+/Dy3+/Sm3+ ions tri-doped samples are close to the standard equal energy white light illumination (x=0.333, y-0.333). With an increasing in Sm3+ ions concentration, blue and green emissions decrease gradually while red emission increases. In addition, the energy transitions among Tm3+, Dy3+, and Sm3+ ions are discussed in detail. The phenomenon is reasonably interpreted based on the analysis of the luminescence lifetime.

  13. A highly sensitive CaF{sub 2}:Dy nanophosphor as an efficient low energy ion dosimetry

    Energy Technology Data Exchange (ETDEWEB)

    Bhadane, Mahesh S.; Hareesh, K.; Dahiwale, S.S.; Sature, K.R. [Microtron Accelerator Laboratory, Department of Physics, Savitribai Phule Pune University, Pune 411007 (India); Patil, B.J. [Department of Physics, Abasaheb Garware College, Pune 411004 (India); Asokan, K.; Kanjilal, D. [Inter University Accelerator Centre, Aruna Asaf Ali Marg, New Delhi 110067 (India); Bhoraskar, V.N. [Microtron Accelerator Laboratory, Department of Physics, Savitribai Phule Pune University, Pune 411007 (India); Dhole, S.D., E-mail: sanjay@physics.unipune.ac.in [Microtron Accelerator Laboratory, Department of Physics, Savitribai Phule Pune University, Pune 411007 (India)

    2016-11-01

    Highlights: • CaF{sub 2}:Dy nanophosphor synthesized by chemical co-precipitation route. • Phosphors are irradiated by H, Ar and N low energy ions at different fluences. • LEBI irradiated phosphors are characterized by XRD, TEM, FTIR and PL spectroscopy. • First time report to LEIB irradiated for thermoluminescence dosimetric applications. - Abstract: Dysprosium doped calcium fluoride (CaF{sub 2}:Dy) powers synthesized by co-precipitation method were irradiated with low energy ion beams (LEIB) viz. 100 keV H, 200 keV Ar and 350 keV N beams at different fluences and demonstrated for low energy ion dosimetric application. X-ray Diffraction and Transmission electron microscopy revealed the formation of highly crystalline cubic structured particles with size ∼45–50 nm. FTIR spectra of the CaF{sub 2}:Dy samples show changes of some bonds such as N–O asymmetric, C–F bonding and C–H aromatic contain stretching mode after LEIB irradiation. The thermoluminescence (TL) glow curve peaks were observed at 207 °C for Ar ion, at 203 °C for H ion and at 216 °C and 270 °C for N ion. It has been found that CaF{sub 2}:Dy nanophosphor shows a linear response with minimum fading for all the ion species. Computerized Glow Curve Deconvolution was performed for TL curve of high fluence ion irradiated nanophosphor to estimate the trapping parameters and the respective figure of merit (FOM) found to be very appropriate for all the nanophosphor. These results indicated that the CaF{sub 2}:Dy can be used as a low energy ion detector or dose.

  14. The effect of urea:nitrate ratio on the structure and luminescence properties of YVO4:Dy3+ phosphors

    Science.gov (United States)

    Foka, K. E.; Dejene, B. F.; Swart, H. C.

    2016-01-01

    YVO4:Dy3+ phosphor has been successfully synthesised using combustion method. The dependence of the properties of YVO4:Dy3+ phosphor upon urea:nitrate concentration was investigated. The single tetragonal phase was observed by x-ray diffraction spectra. A highly crystalline YVO4:Dy3+ sample was obtained when increasing the ratio of the urea to 2. The estimated crystalline sizes from the Scherrer's formula were found to be 20, 38, 33, 30, and 27 nm for the sample prepared with the ratio of 1, 2, 2.5, 3 and 4, respectively. The formation of agglomerated particles was observed by Scanning electron microscope images and it was observed that when increasing the concentration of urea further, flake-like particles formed. The diffuse reflectance spectra of YVO4:Dy3+ with various ratios of urea indicated that the determined optical band gap was ranging from 3.3 to 2.3 eV. Luminescence properties of YVO4:Dy3+ showed that the phosphor emit yellow colour at 573 nm and blue colour at 482 nm corresponding to 4F9/2→6H13/2 and 4F9/2→6H15/2 transitions, respectively. A very weak band at 663 nm which correspond to the 4F9/2→6H11/2 transition was also observed. It was found that the Photoluminescent emission intensity increased with an increase in the ratio of urea and reached a maximum at 2 then decreased when increasing the ratio of urea further.

  15. Magnetic and magnetocaloric properties of DyMn{sub 2}Si{sub 2} compound with multiple magnetic phase transition

    Energy Technology Data Exchange (ETDEWEB)

    Reis, D.C. dos; França, E.L.T. [Centro de Ciências Sociais Saúde e Tecnologia (CCSST), Universidade Federal do Maranhão – UFMA R. Urbano Santos, s/n, 65900-410 Imperatriz, Maranhão (Brazil); Paula, V.G. de [Instituto de Física “Gleb Wataghin”, Universidade Estadual de Campinas – UNICAMP, R. Sérgio Buarque de Holanda, 777, 13083-859 Campinas, São Paulo (Brazil); Santos, A.O. dos [Centro de Ciências Sociais Saúde e Tecnologia (CCSST), Universidade Federal do Maranhão – UFMA R. Urbano Santos, s/n, 65900-410 Imperatriz, Maranhão (Brazil); Coelho, A.A.; Cardoso, L.P. [Instituto de Física “Gleb Wataghin”, Universidade Estadual de Campinas – UNICAMP, R. Sérgio Buarque de Holanda, 777, 13083-859 Campinas, São Paulo (Brazil); Silva, L.M. da, E-mail: luzeli.moreira@ufma.br [Centro de Ciências Sociais Saúde e Tecnologia (CCSST), Universidade Federal do Maranhão – UFMA R. Urbano Santos, s/n, 65900-410 Imperatriz, Maranhão (Brazil)

    2017-02-15

    Structural, magnetic and magnetocaloric properties of the ternary intermetallic compound DyMn{sub 2}Si{sub 2} are studied by X-ray diffraction and magnetization measurements. It is found that DyMn{sub 2}Si{sub 2} crystalizes with tetragonal ThCr{sub 2}S{sub 2}-type structure and exhibits four successive magnetic transitions at low temperature, around 20 K, 31 K, 38 K and 82 K, named respectively as T{sub 1}, T{sub 2}, T{sub 3} and T{sub 4} transitions. Large values of magnetic field (>35 kOe) favor antiferromagnetic clusters and give rise to exchange bias effect. The different responses of T{sub 2} and T{sub 3} to field change, induces two non-identical isothermal entropy change (-ΔS{sub M}) peaks. The maximum values of -ΔS{sub M} occur in temperatures around T{sub 3} and reaches 8.2 J/kgK, for a magnetic field change of 50 kOe. Also, the presence of transitions T{sub 2} and T{sub 3} close to each other induces a table-like magnetocaloric effect (MCE) in a wide temperature range. Thus, the peculiar magnetic properties observed for DyMn{sub 2}Si{sub 2} compound are interesting for low temperature magnetic refrigeration. - Highlights: • The ternary intermetallic compound DyMn{sub 2}Si{sub 2} is proposed as magnetocaloric material. • Four magnetic phase transitions were identified for DyMn{sub 2}Si{sub 2} at low temperatures. • H >35 kOe favor antiferromagnetic clusters and give rise to exchange bias effect. • Two successive magnetic phase transitions induce a large table like EMC.

  16. ZnTe/CdTe thin-film heterojunctions

    OpenAIRE

    Kolesnyk, M. M.; A.S. Opanasyuk; N.V. Tyrkusova; S.N. Danilchenko

    2009-01-01

    In this work we have studied the structural and electrophysical properties of the ZnTe/CdTe heterojunctions, obtained by the method of thermal evaporation in quasi-closed volume. Investigations allowed to define the films structural parameters, such as texture, lattice constant, sizes of grains and coherent-scattering domains, micro-deformation level, and their dependence on the conditions of films production as well. Electrophysical investigations allowed to define the charge-transport mecha...

  17. Steering dissociation of Br2 molecules with two femtosecond pulses via wave packet interference.

    Science.gov (United States)

    Han, Yong-Chang; Yuan, Kai-Jun; Hu, Wen-Hui; Yan, Tian-Min; Cong, Shu-Lin

    2008-04-07

    The dissociation dynamics of Br2 molecules induced by two femtosecond pump pulses are studied based on the calculation of time-dependent quantum wave packet. Perpendicular transition from X 1Sigma g+ to A 3Pi 1u+ and 1Pi 1u+ and parallel transition from X 1Sigma g+ to B 3Pi 0u+, involving two product channels Br (2P3/2)+Br (2P3/2) and Br (2P3/2)+Br* (2P1/2), respectively, are taken into account. Two pump pulses create dissociating wave packets interfering with each other. By varying laser parameters, the interference of dissociating wave packets can be controlled, and the dissociation probabilities of Br2 molecules on the three excited states can be changed to different degrees. The branching ratio of Br*/(Br+Br*) is calculated as a function of pulse delay time and phase difference.

  18. Perceptions of breath alcohol concentration (BrAC) levels among a sample of bar patrons with BrAC values of 0.08% or higher.

    Science.gov (United States)

    Martin, Ryan J; Chaney, Beth H; Cremeens-Matthews, Jennifer; Vail-Smith, Karen

    2016-09-01

    Breath alcohol concentration (BrAC) is a commonly used measure of alcohol intoxication. Because of the potential negative consequences of excessive alcohol consumption, it is important to examine how accurately intoxicated individuals can estimate their BrAC values, especially individuals over the legal BrAC driving threshold (i.e., 0.08%). To better understand perceptions of BrAC values among intoxicated individuals, this field study examined actual BrAC values and BrAC range estimates (0.08% and above, 0.02-0.07%, less than 0.02%) among a sample of bar patrons (N = 454) with BrAC levels at 0.08% or higher. Bivariate and multivariate analyses were conducted to examine the relationship between actual BrAC values and perceived BrAC levels. We also examined whether the following demographic and drinking variables were associated with underestimating BrAC in this sample: gender, age, race, college student status, plans to get home, and hazardous drinking. Results indicated that the majority (60.4%) of participants underestimated their BrAC (i.e., less than 0.08%) and lower BrAC values correlated with underestimating BrAC ranges (p < .001, 95% CI[0.2, 0.6]). Further, females (p = .001, 95% CI[1.3, 3.3]) and participants under 21 (p = .039, 95% CI = 1.0, 2.6) were significantly more likely to estimate their BrAC to be less than 0.08%, which is concerning given that young (less than 21) intoxicated females are a group at high risk for sexual assault on college campuses. (PsycINFO Database Record (c) 2016 APA, all rights reserved).

  19. Obtaining continuous BrAC/BAC estimates in the field: A hybrid system integrating transdermal alcohol biosensor, Intellidrink smartphone app, and BrAC Estimator software tools.

    Science.gov (United States)

    Luczak, Susan E; Hawkins, Ashley L; Dai, Zheng; Wichmann, Raphael; Wang, Chunming; Rosen, I Gary

    2017-12-02

    Biosensors have been developed to measure transdermal alcohol concentration (TAC), but converting TAC into interpretable indices of blood/breath alcohol concentration (BAC/BrAC) is difficult because of variations that occur in TAC across individuals, drinking episodes, and devices. We have developed mathematical models and the BrAC Estimator software for calibrating and inverting TAC into quantifiable BrAC estimates (eBrAC). The calibration protocol to determine the individualized parameters for a specific individual wearing a specific device requires a drinking session in which BrAC and TAC measurements are obtained simultaneously. This calibration protocol was originally conducted in the laboratory with breath analyzers used to produce the BrAC data. Here we develop and test an alternative calibration protocol using drinking diary data collected in the field with the smartphone app Intellidrink to produce the BrAC calibration data. We compared BrAC Estimator software results for 11 drinking episodes collected by an expert user when using Intellidrink versus breath analyzer measurements as BrAC calibration data. Inversion phase results indicated the Intellidrink calibration protocol produced similar eBrAC curves and captured peak eBrAC to within 0.0003%, time of peak eBrAC to within 18min, and area under the eBrAC curve to within 0.025% alcohol-hours as the breath analyzer calibration protocol. This study provides evidence that drinking diary data can be used in place of breath analyzer data in the BrAC Estimator software calibration procedure, which can reduce participant and researcher burden and expand the potential software user pool beyond researchers studying participants who can drink in the laboratory. Copyright © 2017. Published by Elsevier Ltd.

  20. Size effects on magnetic property of multiferroic DyMn2O5 nanorods

    Directory of Open Access Journals (Sweden)

    Yung-Hsiang Tung

    2017-05-01

    Full Text Available DyMn2O5 multiferroic nanorods with radial (D × axial ( lengths of 24(9 nm × 46(12 nm, 36(9 nm × 84(26 nm and 111(22 nm × 212(84 nm, were fabricated through the hydrothermal method. The aspect ratio /D of the nanorods retained the value 2 at different annealing temperatures (Ta = 400, 800, and 1000 °C for = 46, 84, and 212 nm, respectively. Antiferromagnetic magnetic ordering started at approximately 42 K, 42 K, and 50 K for = 46 nm, 84 nm, and 212 nm samples, respectively. The saturation magnetic moment (s, Hc, and Mr decreased as increased. The results of magnetic hysteresis experiment implied that magnetic domain sizes decreased as the increased. The size effect not only merges the nanorods into larger crystals but also reduces interior magnetic domain sizes.

  1. Ground state and magnetic phase transitions of orthoferrite DyFeO3

    Science.gov (United States)

    Zhao, Z. Y.; Zhao, X.; Zhou, H. D.; Zhang, F. B.; Li, Q. J.; Fan, C.; Sun, X. F.; Li, X. G.

    2014-06-01

    Low-temperature thermal conductivity (κ), as well as magnetization (M) and electric polarization (P), of multiferroic orthoferrite DyFeO3 single crystals are studied with H ∥c. When the crystal is cooled in zero field, M, P, and κ all consistently exhibit irreversible magnetic-field dependencies. In particular, with 500 mK ultra-low-T (T mK) κ (H) shows a different irreversibility and there is only one transition when the field is swept both up and down. All the results indicate a complex low-T H-T phase diagram involving successive magnetic phase transitions of the Fe3+ spins. In particular, the ground state, obtained with cooling to sub-Kelvin temperatures in zero field, is found to be an unexplored phase.

  2. Brilliant Sm, Eu, Tb and Dy chiral lanthanide complexes withstrong circularly polarized luminescence

    Energy Technology Data Exchange (ETDEWEB)

    Petoud, Stephane; Muller, Gilles; Moore, Evan G.; Xu, Jide; Sokolnicki, Jurek; Riehl, James P.; Le, Uyen; Cohen, Seth M.; Raymond,Kenneth N.

    2006-07-10

    The synthesis, characterization and luminescent behavior of trivalent Sm, Eu, Dy and Tb complexes of two enantiomeric, octadentate, chiral, 2-hydroxyisophthalamide ligands are reported. These complexes are highly luminescent in solution. Functionalization of the achiral parent ligand with a chiral 1-phenylethylamine substituent on the open face of the complex in close proximity to the metal center yields complexes with strong circularly polarized luminescence (CPL) activity. This appears to be the first example of a system utilizing the same ligand architecture to sensitize four different lanthanide cations and display CPL activity. The luminescence dissymmetry factor, g{sub lum}, recorded for the Eu(III) complex is one of the highest values reported, and this is the first time the CPL effect has been demonstrated for a Sm(III) complex with a chiral ligand. The combination of high luminescence intensity with CPL activity should enable new bioanalytical applications of macromolecules in chiral environments.

  3. Effect of pressure on the metamagnetic transition of DyB{sub 6} single crystal

    Energy Technology Data Exchange (ETDEWEB)

    Sakai, T. [Department of General Education, Ariake National College of Tecnology, Omuta, Fukuoka 836-8585 (Japan)]. E-mail: sakai@ariake-nct.ac.jp; Oomi, G. [Department of Physics, Kyushu University, Ropponmatsu, Fukuoka 810-8560 (Japan); Uwatoko, Y. [Institute for Solid State Physics, University of Tokyo, Kashiwa, Chiba 277-8581 (Japan); Kunii, S. [Department of Physics, Tohoku University, Sendai, Miyagi 980-8578 (Japan)

    2007-03-15

    The effects of pressure on the magnetization (M) and the magnetostriction (MS) for DyB{sub 6} single crystal have been measured at 4.2 K. It is found that the M loops are insensitive to pressure, whereas the large MS with magnitude of 0.5% at 5 T at ambient pressure is rapidly suppressed by applying pressure. The metamagnetic transition field H {sub M} in the M curve increases slightly by applying pressure with the rate of increase, {partial_derivative} ln H {sub M}/{partial_derivative}P, of 0.03 GPa{sup -1}, which is almost the same value as that for T {sub N}, 0.04 GPa{sup -1}.

  4. DIVERSITÉ FLORISTIqUE, STRUCTURE ET DyNAMIqUE DES ...

    African Journals Online (AJOL)

    dans une matrice de forêt dense semi-décidue (forêt de Bamo, Côte d'ivoire). Après analyse de la flore locale, qui ... Les jachères post-culturales subissent une dynamique progressive caractérisée par la succession de plusieurs stades de jachères. ..... d'extinction de la flore de la Côte d'ivoire. Monogr. Syst. Bot. Missouri ...

  5. Cathodoluminescence emission of REE (Dy, Pr and Eu) doped LaAlO3 phosphors

    Science.gov (United States)

    Boronat, C.; Rivera, T.; Garcia-Guinea, J.; Correcher, V.

    2017-01-01

    Luminescence emission from rare earth (REE) ions doped materials are being of interest since can be employed as scintillators, catalysts, battery and magnetic materials, etc. We herein report on the preliminary results obtained from the cathodoluminescence (CL) properties of undoped LaAlO3 (LAO) and LaAlO3: REE3+ (REE=Dy3+, Pr3+ and Eu3+) samples synthesized by a sol-gel process based on the Pechini's method with a spray-drying technique. The samples, previously characterized by means of Environmental Scanning Electron Microscopy and Energy Dispersive X-Ray Analysis Spectrometry, display CL spectra with well-defined peaks that could specifically be associated with the LAO structure (in the range of 300-450 nm) and point defects (from 450 to 800 nm) spectral regions. The observed wavebands are as follows: (i) 480 and 570 from the Dy-doped LAO correspond respectively to 4F9/2→6H15/2 and 4F9/2→6H13/2 transitions, (ii) 490-638 from the Pr-doped LAO is linked to 3P0→3H4, 1D2→3H4 transitions and (iii) 590 and 620 where the dopant Eu3+ gives rise to 5D0→7F1 and 5D0→7F2 transitions and (iv) a UV-blue broad band is associated with NBHOC in undoped LAO. Such emissions are due to the presence of the 4f electrons of rare earth ions that are shielded by the outer 5s and 5p electrons, the intra-4f emission spectra of REE that induce sharp and narrow wavebands.

  6. OMC/INTEGRAL photometric observations of pulsating components in eclipsing binaries and characterization of DY Aqr

    Science.gov (United States)

    Alfonso-Garzón, J.; Montesinos, B.; Moya, A.; Mas-Hesse, J. M.; Martín-Ruiz, S.

    2014-10-01

    We present the search for eclipsing binaries with a pulsating component in the first catalogue of optically variable sources observed by Optical Monitoring Camera (OMC)/INTEGRAL, which contains photometric data for more than 1000 eclipsing binaries. Five objects were found and a detailed analysis of one of them, DY Aqr, has been performed. Photometric and spectroscopic observations of DY Aqr were obtained to analyse the binary system and the pulsational characteristics of the primary component. By applying the binary modelling software PHOEBE to the OMC and ground-based photometric light curves, and to the radial velocity curve obtained using echelle high-resolution spectroscopy, the physical parameters of the system have been determined. Frequency analysis of the residual data has been performed using Fourier techniques to identify pulsational frequencies. We have built a grid of theoretical models to classify spectroscopically the primary component as an A7.5V star (plus or minus one spectral subtype). The best orbital fit was obtained for a semidetached system configuration. According to the binary modelling, the primary component has Teff = 7625 ± 125 K and log g = 4.1 ± 0.1 and the secondary component has Teff = 3800 ± 200 K and log g = 3.3 ± 0.1, although it is too faint to isolate its spectral features. From the analysis of the residuals, we have found a main pulsation frequency at 23.37 d-1, which is typical of a δ Scuti star. In the O-C diagram, no evidence of orbital period changes over the last 8 yr has been found.

  7. Sept brèves leçons de physique

    CERN Document Server

    Rovelli, Carlo

    2015-01-01

    Avec les mots de l écrivain, le talent du poète, Carlo Rovelli nous fait apercevoir le mystère du monde, la beauté du monde, une beauté à couper le souffle. Ces « sept leçons » donnent un aperçu rapide des aspects les plus importants et fascinants de la grande révolution qui a bouleversé la physique au xxe siècle, et surtout des questions et des mystères que cette révolution a soulevés. Elles nous emmènent dans le monde enchanté des grandes idées de la physique actuelle : de la relativité générale d Einstein à la physique quantique, des particules élémentaires à l architecture de l Univers, de la gravité quantique à la nature du temps et de la conscience. Un éblouissement ! Traduit en vingt-quatre langues, les Sept brèves leçons de physique sont un best-seller mondial.

  8. Pathways toward higher performance CdS/CdTe devices: Te exposure of CdTe surface before ZnTe:Cu/Ti contacting

    Energy Technology Data Exchange (ETDEWEB)

    Gessert, T.A., E-mail: tim.gessert@nrel.gov; Burst, J.M.; Wei, S.-H.; Ma, J.; Kuciauskas, D.; Rance, W.L.; Barnes, T.M.; Duenow, J.N.; Reese, M.O.; Li, J.V.; Young, M.R.; Dippo, P.

    2013-05-01

    Many studies of thin-film CdS/CdTe photovoltaic devices have suggested that performance may be improved by reducing recombination due to Te-vacancy (V{sub Te}), Te antisite (Te{sub Cd}), or Te-interstitial (Te{sub i}) defects. Although formation of these intrinsic defects is likely influenced by CdTe deposition parameters, it may be also coupled to the formation of beneficial cadmium vacancy (V{sub Cd}) defects. In this study, we expose the CdTe surface to Te vapor prior to ZnTe:Cu/Ti contact-interface formation with the goal of reducing V{sub Te} without significantly reducing V{sub Cd}. Initial results show that when this modified contact is used on a CdCl{sub 2}-treated CdS/CdTe device, poorer device performance results. This suggests two things: First, the amount of free-Te available during contact formation (either from chemical etching or Cu{sub x}Te or ZnTe deposition) may be a more important parameter to device performance than previously appreciated. Second, if processes have been used to reduce the effect of V{sub Te} (e.g., oxygen and chlorine additions), adding even a small amount of Te may produce detrimental defects. - Highlights: ► Te exposure of CdS/CdTe back contact reduces device performance. ► Field strength and minority carrier lifetime reduced. ► Calculations suggest formation of Te on Cd antisite defect.

  9. Identification of Yellow Pigmentation Genes in Brassica rapa ssp. pekinensis Using Br300 Microarray

    Directory of Open Access Journals (Sweden)

    Hee-Jeong Jung

    2014-01-01

    Full Text Available The yellow color of inner leaves in Chinese cabbage depends on its lutein and carotene content. To identify responsible genes for yellow pigmentation in leaves, the transcriptome profiles of white (Kenshin and yellow leaves (Wheessen were examined using the Br300K oligomeric chip in Chinese cabbage. In yellow leaves, genes involved in carotene synthesis (BrPSY, BrPDS, BrCRTISO, and BrLCYE, lutein, and zeaxanthin synthesis (BrCYP97A3 and BrHYDB were upregulated, while those associated with carotene degradation (BrNCED3, BrNCED4, and BrNCED6 were downregulated. These expression patterns might support that the content of both lutein and total carotenoid was much higher in the yellow leaves than that in the white leaves. These results indicate that the yellow leaves accumulate high levels of both lutein and β-carotene due to stimulation of synthesis and that the degradation rate is inhibited. A large number of responsible genes as novel genes were specifically expressed in yellow inner leaves, suggesting the possible involvement in pigment synthesis. Finally, we identified three transcription factors (BrA20/AN1-like, BrBIM1, and BrZFP8 that are specifically expressed and confirmed their relatedness in carotenoid synthesis from Arabidopsis plants.

  10. High gradient rf gun studies of CsBr photocathodes

    Directory of Open Access Journals (Sweden)

    Theodore Vecchione

    2015-04-01

    Full Text Available CsBr photocathodes have 10 times higher quantum efficiency with only 3 times larger intrinsic transverse emittance than copper. They are robust and can withstand 80  MV/m fields without breaking down or emitting dark current. They can operate in 2×10^{−9}  torr vacuum and survive exposure to air. They are well suited for generating high pulse charge in rf guns without a photocathode transfer system.

  11. Introducing Eu{sup 2+} into yellow phosphor LiBaB{sub 9}O{sub 15}:Ce{sup 3+}, Dy{sup 3+} as blue emitting source to realize white emission

    Energy Technology Data Exchange (ETDEWEB)

    Li, Ting; Li, Panlai, E-mail: li_panlai@126.com; Fu, Nian, E-mail: funian3678@163.com; Wang, Zhijun; Xu, Shuchao; Bai, Qiongyu; Yang, Zhiping

    2017-04-15

    A series of Dy{sup 3+}, Ce{sup 3+}/Dy{sup 3+}, Eu{sup 2+}/Dy{sup 3+} and Ce{sup 3+}/Eu{sup 2+}/Dy{sup 3+} doping LiBaB{sub 9}O{sub 15} (LBB) phosphors were synthesized via a high temperature solid-state method. LBB:Dy{sup 3+} cannot create light under ultraviolet radiation, however, LBB:Ce{sup 3+}, Dy{sup 3+} can produce yellow emission under 295 nm excitation. The energy transfer occurs from Ce{sup 3+} to Dy{sup 3+} ions via electric dipole-dipole interaction and the critical distance is estimated to be 21.15 Å based on concentration quenching model. Generally, Eu{sup 2+} ion is a sensitizer to Dy{sup 3+} ion, however, there is only the emission of Eu{sup 2+} in LBB:Eu{sup 2+}, Dy{sup 3+}, which means there is no energy transfer from Eu{sup 2+} to Dy{sup 3+} ions. Interestingly enough, when doping Eu{sup 2+} ion into LBB:Ce{sup 3+}, Dy{sup 3+}, white emission can be achieved by increase the blue (350–425 nm) emission intensity. The spectral property, quantum efficiency, CIE chromaticity coordinates and thermal quenching property of LBB:Ce{sup 3+}, Eu{sup 2+}, Dy{sup 3+} are investigated. The results indicate that LBB:Ce{sup 3+}, Eu{sup 2+}, Dy{sup 3+} may be a potential application to white light emitting diodes. - Graphical abstract: LBB:Ce{sup 3+}, Dy{sup 3+} can create white emission by doping Eu{sup 2+} ions. - Highlights: • LBB:Ce{sup 3+}, Dy{sup 3+} can produce white emission by doping Eu{sup 2+} ion. • There is no energy transfer from Eu{sup 2+} to Dy{sup 3+} ions. • Energy transfer occurs from Ce{sup 3+} to Dy{sup 3+} ions. • LBB:Ce{sup 3+}, Eu{sup 2+}, Dy{sup 3+} may be a potential application for white LEDs.

  12. Trématodes parasites de poissons marins du littoral de Rio de Janeiro, Brésil

    Directory of Open Access Journals (Sweden)

    Martine Wallet

    1987-03-01

    Full Text Available Les Trématodes de 35 espèces de poissons marins, d'importance commerciale, collectés dans le littoral de Rio de Janeiro, ont été étudiés. Dix-sept espèces de Trématodes appartenant à 13 familles ont été recensées. Quatre de ces espèces sont référés pour la première fois au Brésil: Diphtherostomum americanum, Diplomonorchis floridensis, Pancreadium otagoensis et Neomegasolena chaetodipteri, neuf dans de nouveaux hôtes: D. americanum, Diplangus paxillus, Hurleytrema shorti, Lecithochirium microstomum, Morascus filiformis, Neolebouria multilobatus, P. otagoensis, Pleorchis mollis et Opechona bacillaris, une a été recontrée dans un hôte mentionné pour la première fois au Brésil: Vitellibaculum spinosum et cinq autres espècies sont déjà répertoriées: Acanthocollaritrema umbilicatum, Bucephalopsis calliocotyle, Bucephalus varicus, Parahemiurus merus et Tergestia pauca. Tergestia selenei est consideré synonyme de T. pauca. Les principales mesures sont données pour chaque espèce.

  13. Four-dimensional quantum study on exothermic complex-forming reactions: Cl- + CH3Br-->ClCH3+Br-.

    Science.gov (United States)

    Hennig, Carsten; Schmatz, Stefan

    2005-06-15

    The exothermic gas-phase bimolecular nucleophilic substitution (S(N)2) reaction Cl(-)+CH(3)Br (upsilon1',upsilon2',upsilon3')-->ClCH(3) (upsilon1,upsilon2,upsilon3)+Br- and the corresponding endothermic reverse reaction have been studied by time-independent quantum scattering calculations in hyperspherical coordinates on a coupled-cluster potential-energy surface. The dimensionality-reduced model takes four degrees of freedom into account [Cl-C and C-Br stretching modes (quantum numbers upsilon3' and upsilon3); totally symmetric modes of the methyl group, i.e., C-H stretching (upsilon1' and upsilon1) and umbrella bending vibrations (upsilon2' and upsilon2)]. Diagonalization of the Hamiltonian was performed employing the Lanczos algorithm with a variation of partial reorthogonalization. A narrow grid in the total energy was employed so that long-living resonance states could be resolved and extracted. While excitation of the reactant umbrella bending mode already leads to a considerable enhancement of the reaction probability, its combination with vibrational excitation of the broken C-Br bond, (0, 1, 1), results in a strong synergic effect that can be rationalized by the similarity with the classical transitional normal mode. Exciting the C-H stretch has a non-negligible effect on the reaction probability, while for larger translational energies this mode follows the expected spectatorlike behavior. Combination of C-Br stretch and symmetric C-H, (1,0,1), stretch does not show a cooperative effect. Contrary to the spectator mode concept, energy originally stored in the C-H stretching mode is by no means conserved, but almost completely released in other modes of the reaction products. Products are most likely formed in states with a high degree of excitation in the new C-Cl bond, while the internal modes of the methyl group are less important. Reactants with combined umbrella/C-Br stretch excitation, (0, 1, 1), may yield products with two quanta in the umbrella mode.

  14. Optimized Control Rods of the BR2 Reactor

    Energy Technology Data Exchange (ETDEWEB)

    Kalcheva, Silva; Koonen, E.

    2007-09-15

    At the present time the BR-2 reactor uses control elements with cadmium as neutron absorbing part. The lower section of the control element is a beryllium assembly cooled by light water. Due to the burn up of the lower end of the cadmium section during the reactor operation, the presently used rods for reactivity control of the BR-2 reactor have to be replaced by new ones. Considered are various types Control Rods with full active part of the following materials: cadmium (Cd), hafnium (Hf), europium oxide (Eu2O3) and gadolinium (Gd2O3). Options to decrease the burn up of the control rod material in the hot spot, such as use of stainless steel in the lower active part of the Control Rod are discussed. Comparison with the characteristics of the presently used Control Rods types is performed. The changing of the characteristics of different types Control Rods and the perturbation effects on the reactor neutronics during the BR-2 fuel cycle are investigated. The burn up of the Control Rod absorbing material, total and differential control rods worth, macroscopic and effective microscopic absorption cross sections, fuel and reactivity evolution are evaluated during approximately 30 operating cycles.

  15. Bréal, un antinaturalisme d’inspiration humboldtienne

    Directory of Open Access Journals (Sweden)

    Babu Jean-Philippe

    2014-07-01

    Full Text Available Dans De la forme et de la fonction des mots, Bréal formulait, dès 1866, outre une critique générale du formalisme de la philologie comparative depuis Bopp, une thèse radicalement opposée à l’orientation naturaliste de l’évolutionnisme linguistique de Schleicher. Cette thèse, que nous prendrons le risque de définir comme thèse du primat de la fonction sur la forme linguistique, est au coeur de ce programme de linguistique générale pour lequel Bréal allait forger, quelques années plus tard, le mot de sémantique. Fortement marqué par la notion humboldtienne d’innere Sprachform, Bréal, contrairement à Saussure, n'abandonnera jamais le changement linguistique au hasard de l'histoire et maintiendra l'intelligence comme premier moteur des langues, quitte à poser la nécessité de repenser cette intelligence.

  16. Optical and crystallization behavior in Dy3+ doped 40GeSe2-25Ga2Se3-35CsI glass.

    Science.gov (United States)

    Shen, Xiang; Nie, Qiuhua; Xu, Tiefeng; Dai, Shixun; Wang, Xunsi; Chen, Feifei; Yang, Gaobo

    2009-09-15

    Dy(3+) doped 40GeSe(2)-25Ga(2)Se(3)-35CsI (GGC) glass was synthesized, and optical spectrum, such as infrared transmission and Vis-Nir absorption was measured. Base on the Judd-Ofelt theory, the three Judd-Ofelt parameters Omega(t) (t=2, 4, 6) were calculated and the results were compared with other chalcogenide glasses. The small Omega(2) in GGC glass is ascribed to the weak covalency of Se-Dy bond. The theory of crystallization kinetics under non-isothermal condition was developed, and was applied to analyze this Dy(3+) doped GGC glass. From the heating-rate dependence of crystallization temperature, the activation energy for crystallization E=148 kJ/mol is obtained, and this value is much smaller than that of the undoped glass host, indicating the introduction of Dy(3+) ions into the GGC glass will get the host crystallized easily.

  17. Optical absorption, luminescence, and energy transfer processes studies for Dy3+/Tb3+-codoped borate glasses for solid-state lighting applications

    Science.gov (United States)

    Lakshminarayana, G.; Kaky, Kawa M.; Baki, S. O.; Lira, A.; Caldiño, U.; Kityk, I. V.; Mahdi, M. A.

    2017-10-01

    By using melt quenching technique, good optical quality singly doped Dy3+ or Tb3+ and Dy3+/Tb3+-codoped borate glasses were synthesized and studied by optical absorption, excitation, emission and decay lifetimes curve analysis. Following the absorption spectrum, the evaluated Judd-Ofelt (J-O) intensity parameters (Ωλ (λ = 2, 4 and 6)) were used to calculate the transition probability (AR), the branching ratio (βR), and the radiative lifetime (τR) for different luminescent transitions such as 4I15/2 → 6H15/2, 4F9/2 → 6H15/2, 4F9/2 → 6H13/2, 4F9/2 → 6H11/2 and 4F9/2 → 6H9/2,6F11/2 for the 0.5 mol % singly Dy3+-doped glass. The βR calculated (65%) indicates that for lasing applications, 4F9/2 → 6H13/2 emission transition is highly suitable. For all the Dy3+/Tb3+-codoped glasses, Tb3+: 5D3→7F6 emission decay lifetime curves are found to be non-exponential in nature for different concentrations of Dy3+ codoping. Using the Inokuti-Hirayama model, these nonexponential decay curves were analyzed to identify the nature of the energy transfer (ET) processes and here the electric dipole-dipole interaction is dominant for the ET. Based on the excitation and emission spectra and decay lifetimes curve analysis, the cross relaxation and ET processes between Dy3+ and Tb3+ were confirmed. For the 0.5 mol % Tb3+ and 2.0 mol % Dy3+-codoped glass, the evaluated Tb3+→Dy3+ ET efficiency (η) is found to be 45% under 369 nm excitation. Further, for Tb3+/Dy3+ -codoped glasses, an enhancement of Tb3+ green emission is observed up to 1.5 mol % Dy3+ codoping, and this is due to the non-radiative resonant ET from Dy3+ to Tb3+ upon 395 nm excitation. For singly 0.5 mol % Dy3+ or 0.5 mol % Tb3+-doped glass, the calculated color coordinates (x,y) and correlated color temperatures (CCT) represent the neutral white or warm white light regions, whereas Dy3+/Tb3+-codoped glasses (x,y) and CCT values fall in the yellowish green region with respect to the different Dy3

  18. Scaling of the anomalous Hall effect in epitaxial antiperovskite Mn{sub 3.5}Dy{sub 0.5}N involving multiple competing scattering mechanisms

    Energy Technology Data Exchange (ETDEWEB)

    Meng, M.; Wu, S. X., E-mail: wushx3@mail.sysu.edu.cn; Zhou, W. Q.; Li, S. W., E-mail: wushx3@mail.sysu.edu.cn [State Key Laboratory of Optoelectronic Materials and Technologies, School of Materials Science and Engineering, Sun Yat-Sen University, Guangzhou 510275 (China)

    2016-08-22

    Anomalous Hall effect (AHE) has been studied for ferrimagnetic antiperovskite Mn{sub 3.5}Dy{sub 0.5}N film grown by molecular-beam epitaxy. Reflective high energy electron diffraction and transmission electron microscopy demonstrate the high quality of the film. We have used a scaling involving multiple competing scattering mechanisms to distinguish variations of contributions to the AHE by heavily doped Dy. The scaling analysis revealed that the heavily doped Dy has dramatically modified the skew scattering part of the AHE in Mn{sub 4}N and Mn{sub 3.5}Dy{sub 0.5}N has a totally different scattering mechanism from an undoped film.

  19. Study of Fastness, UV Protection, Deodorization and Antimicrobial Properties of Silk Fabrics Dyed with the Liquids Extracted from the Gallnuts, Areca Nuts, and Pomegranate Peels

    Directory of Open Access Journals (Sweden)

    Jung Jin Soun.

    2016-01-01

    Full Text Available The purpose of this research is to study the fastness, UVprotection, deodorization, and antimicrobial properties of silk fabrics dyed with liquids extracted from the gallnuts, areca nuts, and pomegranate peels.

  20. Photoluminescence mechanisms of color-tunable Sr2CeO4: Eu3+, Dy3+ phosphors based on experimental and first-principles investigation

    Science.gov (United States)

    Li, Jie; Li, Xi; Hu, Shengliang; Li, Yingchun; Hao, Yuying

    2013-10-01

    We report single-phased color-tunable phosphors (Sr2CeO4: Eu3+, Dy3+) synthesized by a polymer-network gel method for UV-LED. The photoluminescence properties and possible energy transfer mechanisms of Eu3+ and Dy3+ in Sr2CeO4 were investigated by experiments and first principles calculations. The results show that the 5D0 → 7F2 emission of Eu3+ is enhanced by the increase in the amount of Eu3+ ions and Eu3+ substitution makes more stable defect than Dy3+ substitution does. The photoluminescence mechanism of Sr1.994-xEuxDy0.006CeO4 can be explained by the energy transfer model with the consideration of the defect conditions in the crystals.

  1. Magnetic properties of the layered lanthanide hydroxide series Y(x)Dy(8-x)(OH)20Cl4·6H2O: from single ion magnets to 2D and 3D interaction effects.

    Science.gov (United States)

    Monteiro, Bernardo; Coutinho, Joana T; Pereira, Cláudia C L; Pereira, Laura C J; Marçalo, Joaquim; Almeida, Manuel; Baldoví, José J; Coronado, Eugenio; Gaita-Ariño, Alejandro

    2015-02-16

    The magnetic properties of layered dysprosium hydroxides, both diluted in the diamagnetic yttrium analogous matrix (LYH:0.04Dy), and intercalated with 2,6-naphthalene dicarboxylate anions (LDyH-2,6-NDC), were studied and compared with the recently reported undiluted compound (LDyH = Dy8(OH)20Cl4·6H2O). The Y diluted compound reveals a single-molecule magnet (SMM) behavior of single Dy ions, with two distinct slow relaxation processes of the magnetization at low temperatures associated with the two main types of Dy sites, 8- and 9-fold coordinated. Only one relaxation process is observed in both undiluted LDyH and intercalated compounds as a consequence of dominant ferromagnetic Dy-Dy interactions, both intra- and interlayer. Semiempirical calculations using a radial effect charge (REC) model for the crystal field splitting of the Dy levels are used to explain data in terms of contributions from the different Dy sites. The dominant ferromagnetic interactions are explained in terms of orientations of easy magnetization axes obtained by REC calculations together with the sign of the superexchange expected from the Dy-O-Dy angles.

  2. New method of preparation of CaSO{sub 4}: Dy for ionizing radiation dosimetry; Nuevo metodo de preparacion del CaSO{sub 4}: Dy para dosimetria de radiacion ionizante

    Energy Technology Data Exchange (ETDEWEB)

    Roman L, J.; Rivera M, T.; Alarcon F, G.; Guzman M, J. [CICATA-IPN, 11500 Mexico D.F. (Mexico); Azorin N, J.; Sosa F, R. [UAM-I, 09340 Mexico D.F. (Mexico); Serrano F, A.K. [Hospital Juarez General de Mexico, 07760 Mexico D.F. (Mexico)]. e-mail: holand_jeos@hotmail.com

    2008-07-01

    In this work some results of the characterization of solid state materials exposed at a gamma radiation beam coming from a {sup 60} Co bomb for medical use are presented. These thermoluminescent dosemeters are prepared and proposed for the ionizing radiations dosimetry using the thermoluminescence method. The passive dosemeters of CaSO{sub 4}: Dy are developed in the polycrystalline powder form being used a new synthesis route by means of the precipitation method. To determine the sensibility of the pellets of CaSO{sub 4}: Dy before gamma radiation, these were exposed before a gamma radiation beam coming from a {sup 60} Co bomb. The morphological and structural characteristics were also studied and present two in this work. (Author)

  3. A cross sectional survey on health-related quality of life of elementary school students using the Korean version of the EQ-5D-Y.

    Science.gov (United States)

    Kim, Sang-Kyu; Jo, Min-Woo; Kim, Seon-Ha

    2017-01-01

    The Korean version of the EQ-5D-Y was launched in 2015 by the EuroQol group. Currently, there is no HRQOL data obtained by using the EQ-5D-Y in Korea. This study aimed to measure health-related quality of life of Korean elementary school students using the EQ-5D-Y. Elementary school students were recruited from 11 primary schools in Gyungbuk, South Korea. The EQ-5D-Y was self-administered in the sample population. Demographic characteristics were collected from the subjects' parents or guardians. The percentage of respondents reporting problems and VAS scores were calculated. Feasibility of the EQ-5D-Y was assessed by analysing the proportion of missing responses. The percentage of reported problems on the dimensions and VAS score between groups were compared by demographic factors. A total of 2,494 questionnaires were collected. There were 24 (0.96%) missing responses on the EQ-5D-Y and 187 (7.5%) missing VAS score responses. The proportion of reported problems ranged from 2.3% on the mobility dimension to 9.8% on the "having pain or discomfort" dimension. There was no significant difference in the proportion of problems by age group in male participants. However, in females, the older group reported significantly more problems on the "having pain or discomfort" and "feeling worried, sad, or unhappy" dimensions compared to the younger group. Students living with parents with the lowest educational level reported significantly more problems on the "looking after myself" and "doing usual activities" dimensions than did those living with parents with higher levels of education. This study showed the distribution of health-related quality of life and explored the feasibility of the EQ-5D-Y for measuring health-related quality of life in Korean elementary school students. Further studies are required to examine other psychometric properties of the Korean EQ-5D-Y.

  4. Influence of 45S5 Bioglass addition on microstructure and properties of ultrafine grained (Mg-4Y-5.5Dy-0.5Zr) alloy

    Energy Technology Data Exchange (ETDEWEB)

    Kowalski, K., E-mail: kamil.kowalski@put.poznan.pl [Institute of Materials Science and Engineering, Poznan University of Technology, Jana Pawla II 24, 61-138 Poznan (Poland); Jurczyk, M.U. [Division of Mother’s and Child’s Health, Poznan University of Medical Sciences, Polna 33, 60-535 Poznan (Poland); Wirstlein, P.K. [Department of Gynecology and Obstetrics, Division of Reproduction, Poznan University of Medical Sciences, Polna 33, 60-535 Poznan (Poland); Jakubowicz, J.; Jurczyk, M. [Institute of Materials Science and Engineering, Poznan University of Technology, Jana Pawla II 24, 61-138 Poznan (Poland)

    2017-05-15

    Highlights: • Ultrafine grained composites were formed by consolidating mechanically alloyed powders. • Mechanical properties were sensitive to the content of 45S5 Bioglass in Mg-4Y-5.5Dy-0.5Zr alloy. • Fluoride treated composites displayed superior corrosion resistance in Ringer solution. • Composites modified with MgF{sub 2} have a higher degree of biocompatibility in comparison with the unmodified reference material. - Abstract: Bulk samples of an ultrafine grained (Mg-4Y-5.5Dy-0.5Zr)-x wt% 45S5 Bioglass (x = 0, 5) and (Mg-4Y-5.5Dy-0.5Zr)-5 wt% 45S5 Bioglass-1 wt% Ag composites have been synthesized by consolidating mechanically alloyed powders. The influence of the chemical composition on the microstructure, mechanical properties and corrosion behavior of bulk composites were studied. The sintering of (Mg-4Y-5.5Dy-0.5Zr)-5 wt% 45S5 Bioglass powders led to the formation of a bulk composite with grain size of approx. 95 nm. The corrosion behavior of Mg-based composites before and after hydrofluoric acid treatment was also investigated. The ultrafine grained (Mg-4Y-5.5Dy-0.5Zr)-5 wt% 45S5 Bioglass composite was more corrosion resistant than the bulk Mg-4Y-5.5Dy-0.5Zr alloy after HF treatment. The in vitro biocompatibility of synthesized composites was evaluated and compared with microcrystalline magnesium. Magnesium, (Mg-4Y-5.5Dy-0.5Zr)-5 wt% 45S5 Bioglass and (Mg-4Y-5.5Dy-0.5Zr)-5 wt% 45S5 Bioglass-1 wt% Ag composites modified with MgF{sub 2} have a higher degree of biocompatibility in comparison with the unmodified reference material.

  5. Emission analysis of Sm{sup 3+} and Dy{sup 3+}: Ba{sub 3}Y{sub 2}WO{sub 9} ceramics

    Energy Technology Data Exchange (ETDEWEB)

    Raju, K. Vemasevana; Raju, C. Nageswara; Sailaja, S. [Department of Physics (Research Centre), S.V. Degree College, Kadapa 516003,YSR District (India); Dhoble, S.J. [Department of Physics, RTM Nagpur University, Nagpur 440 001 (India); Reddy, B. Sudhakar, E-mail: drbsreddyphd@gmail.com [Department of Physics (Research Centre), S.V. Degree College, Kadapa 516003,YSR District (India)

    2013-02-15

    A series of Sm{sup 3+} and Dy{sup 3+} ions activated Ba{sub 3}Y{sub 2}WO{sub 9} (BaYW) ceramics were synthesized by using a conventional solid state reaction method. Photoluminescence spectra of Sm{sup 3+} and Dy{sup 3+}: BaYW ceramics have shown strong reddish-orange (596 nm) and blue (494 nm) emission. The tetragonal phase structure has been assigned to the prepared ceramics by the measurement of X-ray diffraction (XRD) profiles. Agglomeration and the nanometer particle size (130 nm to 220 nm) were observed from the SEM images of the ceramics. The functional groups like O--H, CO{sub 3}, W--O bonds, Y--O bonds and the elements such as Ba, Y, W, O, Sm and Dy present in the prepared ceramics were identified by measuring the FTIR and EDAX spectra. In this contribution, we have reported the emission properties of Sm{sup 3+} and Dy{sup 3+}: BaYW ceramics to explore them as novel optical materials and also reported the effect of Sm{sup 3+} and Dy{sup 3+} concentration on the luminescence behavior. Decay kinetics of the prominent emission transitions of Sm{sup 3+} and Dy{sup 3+}: BaYW ceramics are also discussed. - Highlights.: Black-Right-Pointing-Pointer Sm{sup 3+} and Dy{sup 3+}: BaYW ceramics were prepared by solid state reaction method. Black-Right-Pointing-Pointer Sm{sup 3+}: BaYW ceramics have shown an intense reddish-orange color emission. Black-Right-Pointing-Pointer Dy{sup 3+}: BaYW ceramics have shown an intense blue color emission. Black-Right-Pointing-Pointer The nature of the transitions observed in the emission spectra is explained. Black-Right-Pointing-Pointer Phenomenon of concentration quenching has been clearly discussed.

  6. Ustioni da fuoco / Burn injuries / Les brûlures

    Directory of Open Access Journals (Sweden)

    Liliana Copertino

    2008-04-01

    Full Text Available Severe burn injuries require high specialistic treatment. Burn injuries are common in disasters and war scenarios, so war medicine has been fundamental to improve treatment protocols for burn patients..Burn injuries are classified according to the etiopathogenetic agent (physical, chemical or radiation, that determines different anatomoisthologic aspects.An estimation of the depth and extension are fundamental for defining the gravity of the burn. Critical burn patients have to be transported in specialistic Centers. There they are treated by multispecialistic teams from the resuscitation phase to the reconstructive surgery and specialist rehabilitation.. This process can continue for two years with the objective to return patients to a quiet normal life. Les brûlures sont des lésions traumatiques qui requièrent un traitement spécialisé. Lors de catastrophes et de guerres, les brûlures sont des lésions très fréquentes et la médecine de guerre a contribué à faire avancer la science de manière importante, dans le traitement de cette pathologie.Les brûlures sont classées en fonction de l'agent étiopathogénique (agents physiques, chimiques ou radiations dont le mécanisme d'action qui provoque la lésion cause des aspects anatomohistologiques caractéristiques.Pour définir la sévérité d'une brûlure, il est aussi fondamental d'éstimer l'extension de la surface corporelle et la profondeur de l'épiderme, et éventuellement du derme, atteints. Les patients gravement brûlés doivent être hospitalisés dans des Centres Spécialisés où des équipes multispécialistes les suivent de la phase initiale de la réanimation aux phases de chirurgie reconstructive et au processus de réhabilitation. Ces dernières phases peuvent se prolonger pendant les deux années suivant le traumatisme avant qu'une réintégration dans une vie sociale acceptable ne puisse être faite.

  7. 78 FR 28626 - Te Connectivity, Industrial Division, Middletown, Pennsylvania; Te Connectivity, Corporate Shared...

    Science.gov (United States)

    2013-05-15

    ..., Corporate Shared Services Group 100 & 200 Amp Drive, Harrisburg, Pennsylvania; Te Connectivity Corporate Shared Services Group, 3700 Reidsville Road, Winston-Salem, North Carolina; Te Connectivity, Corporate Shared Services Group, 1187 Park Place, Shakopee, Minnesota; Te Connectivity, Corporate Shared Services...

  8. "Brücke dreht sich um!". A Deconstructionist Reading of Kafka's "Die Brücke"

    Directory of Open Access Journals (Sweden)

    Eva Hoffmann

    2014-12-01

    Full Text Available Franz Kafka's (1883-1924 "Die Brücke" is one of the less well-known texts by one of the most prolific authors of literary modernity. However, this short prose text embodies prevalent questions of literary modernity and philosophy as it reflects the crisis of language in regard of identity, communication, and literary production. Placed in the context of fin-de-siècle's discourse of language crisis, this article provides a dialogue between Kafka's "Die Brücke" and Hannah Arendt's (1906-1975 philosophy of thinking and speaking in The Life of the Mind. Contrary to Arendt's understanding of the metaphor as "a carrying over" between the mental activities of the solitude thinker and a reconciliation with the pluralistic world shared with others, this article argues for a deconstructionist reading of "Die Brücke" as a tool to reevaluate Arendt's notion of a shared human experience ensured through language and illustrates the advantages of poetic texts within philosophical discourses.

  9. Measurement of formation cross sections of short-lived nuclei by 14 MeV neutron. Nd, Sm, Dy, Er, Yb

    Energy Technology Data Exchange (ETDEWEB)

    Sakane, H.; Yamamoto, H.; Kawade, K. [Nagoya Univ. (Japan). School of Engineering; Iida, T.; Takahashi, A.

    1997-03-01

    Eight neutron activation cross sections producing the nuclei with half-lives between 3 min and 24 min were obtained at the energy range between 13.4 and 14.9 MeV by activation method. The cross sections were {sup 146}Nd(n,p){sup 146}Pr, {sup 154}Sm(n,{alpha}){sup 151}Nd, {sup 162}Dy(n,p){sup 162}Tb, {sup 163}Dy(n,np){sup 162}Tb, {sup 163}Dy(n,p){sup 163}Tb, {sup 164}Dy(n,p){sup 164}Tb, {sup 170}Er(n,{alpha}){sup 167}Dy, {sup 174}Yb(n,p){sup 170}Tm. {sup 163}Dy(n,np){sup 162}Tb (T{sub 1/2}=7.7 min) was obtained for the first time. Present results are compared with previous results and the evaluated data of JENDL-3 and ENDF/B-VI. There are some discrepancies between present results and the JENDL-3 and ENDF/B-VI. (author)

  10. 75 FR 76624 - Airworthiness Directives; Rolls-Royce Deutschland Ltd & Co KG Models BR700-710A1-10; BR700-710A2...

    Science.gov (United States)

    2010-12-09

    ... Deutschland Ltd & Co KG Models BR700-710A1-10; BR700-710A2-20; and BR700-710C4-11 Turbofan Engines AGENCY....13 by adding the following new AD: 2010-25-05 Rolls-Royce Deutschland Ltd & Co KG (formerly Rolls-Royce Deutschland GmbH, formerly BMW Rolls-Royce GmbH): Amendment 39- 16538. Docket No. FAA-2010-0614...

  11. Superstrengthening Bi_{2}Te_{3} through Nanotwinning.

    Science.gov (United States)

    Li, Guodong; Aydemir, Umut; Morozov, Sergey I; Wood, Max; An, Qi; Zhai, Pengcheng; Zhang, Qingjie; Goddard, William A; Snyder, G Jeffrey

    2017-08-25

    Bismuth telluride (Bi_{2}Te_{3}) based thermoelectric (TE) materials have been commercialized successfully as solid-state power generators, but their low mechanical strength suggests that these materials may not be reliable for long-term use in TE devices. Here we use density functional theory to show that the ideal shear strength of Bi_{2}Te_{3} can be significantly enhanced up to 215% by imposing nanoscale twins. We reveal that the origin of the low strength in single crystalline Bi_{2}Te_{3} is the weak van der Waals interaction between the Te1 coupling two Te1─Bi─Te2─Bi─Te1 five-layer quint substructures. However, we demonstrate here a surprising result that forming twin boundaries between the Te1 atoms of adjacent quints greatly strengthens the interaction between them, leading to a tripling of the ideal shear strength in nanotwinned Bi_{2}Te_{3} (0.6 GPa) compared to that in the single crystalline material (0.19 GPa). This grain boundary engineering strategy opens a new pathway for designing robust Bi_{2}Te_{3} TE semiconductors for high-performance TE devices.

  12. Enhanced luminescence via energy transfer from Ag+ to RE ions (Dy3+, Sm3+, Tb3+) in glasses.

    Science.gov (United States)

    Li, JingJing; Wei, RongFei; Liu, XueYun; Guo, Hai

    2012-04-23

    Oxyfluoride glasses containing Ag species and rare earth (RE) ions (Dy(3+), Sm(3+), Tb(3+)) were prepared by melt-quenching technique. The type of luminescent species of novel excitation band (230-300 nm peaked at 255 nm) and emission band (300-600 nm peaked at 350 nm) were investigated by absorption, excitation, emission spectra, as well as decay lifetime measurements and can be ascribed to isolated Ag(+) ions. Owing to energy transfer from Ag(+) to RE ions, significant enhancements of RE ions emission (76 times for Sm(3+), 41 times for Dy(3+)) were observed for non-resonant UV excitation (255 nm). Our research may extend the understanding of interactions between RE ions and Ag species. © 2012 Optical Society of America

  13. Thermoluminescence characteristics of the novel CaF2:Dy nanoparticles prepared by using the hydrothermal method

    Science.gov (United States)

    Zahedifar, M.; Sadeghi, E.; Harooni, S.

    2012-11-01

    Dysprosium doped calcium fluoride (CaF2:Dy) nanoparticles were produced for the first time by using the hydrothermal method. X-ray diffraction (XRD), scanning electron microscope (SEM) and energy dispersive spectrometer (EDS) patterns were utilized to characterize the synthesized material. The particle size of about 43 nm was evaluated from XRD data and supported by the SEM images. The Tm-Tstop and the computerized glow curve de-convolution (CGCD) methods were employed to determine the number of component glow peaks and kinetic parameters of the synthesized nanoparticles. Thermoluminescence glow curve of this phosphor exhibits six overlapping glow peaks. The optimized concentration of Dy impurity was found at 3 mol%. The prepared nanoparticles exhibit a roughly linear dose response to absorbed dose of 1000 Gy received from 60Co gamma source. This finding recommends this nanomaterial as a good candidate for high dose dosimetry. Other dosimetric features of this novel phosphor are also presented and discussed.

  14. Tissue distribution of the dystrophin-related gene product and expression in the mdx and dy mouse

    Energy Technology Data Exchange (ETDEWEB)

    Love, D.R.; Marsden, R.F.; Bloomfield, J.F.; Davies, K.E. (John Radcliffe Hospital, Oxford (England)); Morris, G.E.; Ellis, J.M. (North East Wales Inst., Deeside, Wales (England)); Fairbrother, U.; Edwards, Y.H. (Univ. College London (England)); Slater, C.P. (Newcastle General Hospital, Newcastle-upon-Tyne (England)); Parry, D.J. (Univ. of Ottawa, Ontario (Canada))

    1991-04-15

    The authors have previously reported a dystrophin-related locus (DMDL for Duchenne muscular dystrophy-like) on human chromosome 6 that maps close to the dy mutation on mouse chromosome 10. Here they show that this gene is expressed in a wide range of tissues at varying levels. The transcript is particularly abundant in several human fetal tissues, including heart, placenta, and intestine. Studies with antisera raised against a DMDL fusion protein identify a 400,000 M{sub r} protein in all mouse tissues tested, including those of mdx and dy mice. Unlike the dystrophin gene, the DMDL gene transcript is not differentially spliced at the 3{prime} end in either fetal muscle or brain.

  15. Photoluminescent properties of Eu3+ and Dy3+ ions doped MgGa2O4 phosphors

    Science.gov (United States)

    Liu, Hai; Yu, Lixin; Li, Fuhai

    2013-02-01

    Several concentrations Eu3+-doped and Dy3+-doped MgGa2O4 phosphors were prepared successfully by two-step firing synthesis. The sintered samples were characterized by means of X-ray diffraction (XRD) and fluorescence spectrophotometer. Little amount of rare earth doped will not change the host matrix structure and the maximum of the emission or excitation intensity of these phosphors will decrease as the concentration increasing for concentration quenching. The emissions of Eu3+ caused by the transitions of 5D0→7Fj (j=0, 1, 2, 3, 4) were observed. And there are three groups of emission at 480 nm, 575 nm and 665 nm occurring at the spectrum of Dy3+ ions, which shows that MgGa2O4 phosphors doped with nanostructures ions have the potentiality to be applied for white LEDs applications.

  16. Measurements of fluorescence and Coster-Kronig yields for 66Dy using synchrotron radiation induced selective photoionization method

    Science.gov (United States)

    Kaur, Rajnish; Kumar, Anil; Czyzycki, M.; Migliori, A.; Karydas, A. G.; Puri, Sanjiv

    2017-09-01

    The L shell fluorescence (ω1, ω2, ω3) and Coster-Kronig (f12, f13, f23) yields for 66Dy have been deduced from the Li (i = 1-3) sub-shell X-ray intensities measured at different incident photon energies across its Li absorption edge energies. Three sets of photoionization cross sections used for determination of these yields include two sets of theoretical values based on the non-relativistic Hartree-Fock-Slater model and the self-consistent Dirac-Hartree-Fock model, and the third one is that deduced from independently measured mass attenuation coefficients of 66Dy. The present experimental fluorescence and Coster-Kronig yields deduced using the self-consistent Dirac-Hartree-Fock model based photoionization cross sections have been found to be in good agreement with the semi-empirical values tabulated by Krause [1] and the Dirac-Hartree-Slater model based values.

  17. A novel Ho 36Dy 20Al 24Co 20 bulk metallic glass with large magnetocaloric effect

    Science.gov (United States)

    Liang, L.; Hui, X.; Zhang, C. M.; Lu, Z. P.; Chen, G. L.

    2008-04-01

    A new heavy rare-earth-based Ho 36Dy 20Al 24Co 20 bulk metallic glass (BMG) has been prepared by a copper mold casting. A maximum magnetic entropy change of 11.77 J/kg K has been measured in Ho 36Dy 20Al 24Co 20 bulk metallic glass under a magnetic field of 5 Tesla, which is larger than that of the early reported Ho-based bulk metallic glass Ho 30Y 26Al 24Co 20. The half-maximum temperature range of the entropy change peak is as large as 40 K, leading to a superior refrigerant capacity to those of the Gd 5Si 2Ge 2 and Gd 5Si 2Ge 1.9Fe 0.1 crystalline compounds. The excellent magnetocaloric effect together with the unique properties of metallic glass makes this alloy a promising candidate for a magnetic refrigerant in the temperature range below 50 K.

  18. E0 decay of the 0{sup +}{sub 2} levels in {sup 156}Dy and {sup 160}Er

    Energy Technology Data Exchange (ETDEWEB)

    Lo Bianco, G; Nardelli, S; Gupta, S Das; Saltarelli, A [School of Science and Technology, University of Camerino and INFN - Sez. Perugia (Italy); Balabanski, D L [INRNE, Bulgarian Academy of Sciences, Sofia (Bulgaria); Blasi, N [INFN - Sez. Milano (Italy); Gladnishki, K [Faculty of Physics, St. Kliment Ohridski University of Sofia (Bulgaria); Fortunato, L, E-mail: balabanski@inrne.bas.b [ECT, Trento (Italy)

    2011-01-01

    The branching between the E0 0{sup +}{sub 2} {yields} 0{sup +}{sub 1} and the E2 0{sup +}{sub 2} {yields} 2{sup +}{sub 2} transitions in {sup 156}Dy and {sup 160}Er were measured following the {epsilon} decay of {sup 156}Ho and {sup 160}Tm. A potential of the 4th order of the deformation parameter {beta}, the {sup L}o Bianco potential{sup ,} was chosen to describe the U(5) - SU(3) first order shape phase transition, covering the whole transitional path. The comparison of the excitation spectra and the measured ratios of reduced transition probabilities, X(E0/E2), with the calculations, indicates that {sup 156}Dy is in the spherical region, while {sup 160}Er is located in the deformed region, but quite close to the critical point.

  19. Influence of Gd, Dy and Fe doping on electrochemical properties of Al87Y5Ni8 amorphous metallic alloy

    Science.gov (United States)

    Bednarska, L.; Kubisztal, J.; Budniok, A.; Kovbuz, M.; Hertsyk, O.; Mika, T.; Kotur, B.

    2011-04-01

    Corrosive properties of some Al-based amorphous metallic alloys (AMA) and the relationship between the AMA composition and nature of protective layers on the surface of alloys were studied. The complex of physico-chemical methods, namely the potentiometry, voltammetry, electrochemical impedance spectroscopy and electronic microscopy, has been used. It was shown that the influence of Dy doping on the same characteristics of alloys is opposite to that of Gd. It increases corrosion resistance of Dy-containing alloys in comparison to the reference Al87Y5Ni8 alloy. Partial substitution of 4 at. % Ni by Fe causes further increase of corrosion resistance of Al87Gd5Ni4Fe4.

  20. Cationic surfactant assisted ultrasound synthesis of Dy3+ doped CdSiO3 nanostructures for white LED application

    Science.gov (United States)

    Basavaraj, R. B.; Nagabhushana, H.; Lingaraju, K.; Prasad, B. Daruka

    2017-05-01

    In this paper we report for the first time Dy3+ (1-7 mol %) doped CdSiO3 nanophosphors prepared via facile ultrasound supported sonochemical route using EGCG (epigallocatechin gallate). The final product was well characterized by PXRD, FTIR, SEM, TEM and PL. The powder X-ray diffraction (PXRD) profiles showed monoclinic phase with highly crystalline nature. The sonication time, concentration of the surfactant play vital role in tuning the morphology. The crystallite size was calculated from PXRD patterns as well as by TEM image and it was found to 20-30 nm. The Fourier transform infrared spectroscopy (FTIR) results confirmed the presence of Si-O-Si and Si-O stretching vibrations in CdSiO3. Photoluminescence properties of Dy3+ (1-7 mol %) doped CdSiO3 excited under near ultra violet wavelength (350 nm) was studied in order to investigate the possibility of its use in white light emitting diode applications. The emission spectra consists of intra 4f transitions of Dy3+, namely 4F9/2 → 6H15/2 (480 nm), and 4F9/2 → 6H13/2 (574 nm) respectively. The 3 mol% Dy3+ doped phosphor showed maximum intensity. The Commission Internationale de I'Eclairage (CIE) and correlated color temperature (CCT) was evaluated. Further, the quantum efficiency and color purity results of the product showed high efficiency and it was highly useful in white light emitting diodes (wLEDs) applications.

  1. Structural and optical characteristics of Ce, Nd, Gd, and Dy-doped Al2O3 thin films

    Science.gov (United States)

    Varpe, Ashwini S.; Deshpande, Mrinalini D.

    2017-07-01

    We present the optical properties of rare earth (RE)-doped Al_2O_3 thin films and discuss their possible use in applications like gate dielectric material and in coating industry. Aluminum oxide films doped with RE elements such as Ce, Nd, Gd, and Dy are synthesized on glass substrate using ultrasonic spray pyrolysis technique at 400°C. The concentration of rare earth element is varied from 0.5 to 5 mol% in 0.1 M solution of Al2O3. The X-ray diffraction analysis indicates that the thin films deposited with and without rare earth doping have an amorphous structure. Further, the optical properties of RE-doped Al2O3 thin films are studied by using UV-visible spectroscopy and photoluminescence measurement. The band gap is found to be 4.06 eV for Al2O3 thin film. A small blue shift is seen in the optical spectra of RE-doped samples as compared to undoped Al2O3 film. Dielectric constant of alumina thin film increases with doping of Gd and Dy while it decreases with Ce and Nd doping. Concentration quenching effects are observed in the photoluminescence spectra of Ce, Nd, Gd, and Dy-doped Al_2O_3 films. Among all these RE-doped Al2O3 thin films, Gd and Dy-doped Al2O3 films exhibit a potential for the construction of dielectric gate in transistors or as a coating material in the semiconductor industry.

  2. Ab Initio Potential Energy Surfaces for Both the Ground (X̃1A′ and Excited (A∼1A′′ Electronic States of HSiBr and the Absorption and Emission Spectra of HSiBr/DSiBr

    Directory of Open Access Journals (Sweden)

    Anyang Li

    2012-01-01

    Full Text Available Ab initio potential energy surfaces for the ground (X̃1A′ and excited (A˜A′′1 electronic states of HSiBr were obtained by using the single and double excitation coupled-cluster theory with a noniterative perturbation treatment of triple excitations and the multireference configuration interaction with Davidson correction, respectively, employing an augmented correlation-consistent polarized valence quadruple zeta basis set. The calculated vibrational energy levels of HSiBr and DSiBr of the ground and excited electronic states are in excellent agreement with the available experimental band origins. In addition, the absorption and emission spectra of HSiBr and DSiBr were calculated using an efficient single Lanczos propagation method and are in good agreement with the available experimental observations.

  3. On the re-emergence of motion and innovations in the Gábor Bódy's intermedia experiments

    Directory of Open Access Journals (Sweden)

    Kamil Lipiński

    2015-06-01

    Full Text Available The article explores the main cases of Hungarian neo-avant-garde cinema in terms of re-emergence of visual material and the introduction of electronic innovations resulting in the transformation of reality. Among the research conducted in Béla Balázs Studio based on reframing the perception limits in the 1960s and the 1970s, the most innovative were Gábor Bódy's intermedia experiments. Along with launching K/3 subgroup within BBS, Bódy directed its objectives to reduce the material derived from reality and to visually intervene into media image electronically transforming the landscape of his films. Innovatively adapting the Sándor Weöres's verse, the film Narcissus and Psyche (1983 aimed at using hyper-real aesthetics to reframe the film reality. Starting from 1980, Bódy founded an international magazine Infermental to disseminate the advent of the video and electronics by creating a community drew on sharing news about emerging media image.

  4. Nanocrystalline MgB{sub 4}O{sub 7}:Dy for high dose measurement of gamma radiation

    Energy Technology Data Exchange (ETDEWEB)

    Lochab, S.P. [Inter-University Accelerator Centre, Aruna Asaf Ali Marg, New Delhi-110067 (India); Pandey, A. [Department of Physics, Sri Venkateswara College, University of Delhi, Benito Juarez Road, Dhaula Kuan, New Delhi-110021 (India); Sahare, P.D.; Ranjan, Ranju [Department of Physics and Astrophysics, University of Delhi, Delhi-110007 (India); Chauhan, R.S. [Department of Physics, RBS College, B. R. Ambedkar University, Agra-282002 (India); Salah, Numan [Department of Physics, Faculty of Applied Sciences, Thamar University, Thamar (Yemen)

    2007-07-15

    Magnesium borate activated by dysprosium (MgB{sub 4}O{sub 7}:Dy) is a low-Z{sub eff}, tissue-equivalent material that is commonly used for medical dosimetry of ionizing radiations such as gamma and X-rays using the thermoluminescence (TL) technique. Nanocrystals of the same material are produced and their TL characteristics are studied. It is found that the nanocrystalline MgB{sub 4}O{sub 7}:Dy with a dopant concentration of 1000 ppm is the most sensitive amongst varying dopant concentrations, with its sensitivity equal to 0.025 times that of the standard phosphor CaSO{sub 4}:Dy. The glow curve has two peaks at 154 C and 221 C. The nanophosphor has very poor sensitivity for low doses up to 10 Gy but beyond this dose the phosphor exhibits a linear response up to 5000 Gy. On increasing the dose further the response first becomes supralinear and then sublinear, finally resulting into saturation. Considering also its low fading particularly under post-irradiation annealing and excellent reusability features, this nanophosphor may be used for high dose (10-5000 Gy) measurements of ionizing radiations. (copyright 2007 WILEY-VCH Verlag GmbH and Co. KGaA, Weinheim) (orig.)

  5. Specific heat of REBaSrCu{sub 3}O{sub 7} compounds (R=Nd, Sm, Dy, Er)

    Energy Technology Data Exchange (ETDEWEB)

    Tarnawski, Z. [Academy of Min. and Metall., Cracow (Poland). Solid State Phys. Dept.]|[Amsterdam Univ. (Netherlands). Van der Waals-Zeeman Inst.; Wang, X.Z. [Johannes Keppler Univ., Linz (Austria). Angewandte Physik; Kim-Ngan, N.-T.H. [Pedagogical Univ., Krakow (Poland). Center for Solid State Physics]|[Pedagogical Univ., Krakow (Poland). Inst. of Physics; Radwanski, R.J. [Pedagogical Univ., Krakow (Poland). Center for Solid State Physics]|[Pedagogical Univ., Krakow (Poland). Inst. of Physics; Franse, J.J.M. [Amsterdam Univ. (Netherlands). Van der Waals-Zeeman Inst.

    1996-05-01

    Specific heat measurements have been performed on polycrystalline REBaSrCu{sub 3}O{sub 7} (R=Nd, Sm, Dy, Er) in the temperature range from 0.3 to 3 K. Antiferromagnetic order is indicated by the {lambda}-type peak in the specific heat at 1.2 and 0.6 K for Dy and Er compounds, respectively, whereas only a broad anomaly around 0.6 K is observed for Nd and Sm compounds. The specific heat data for Nd and Sm compounds are well fit with a Schottky-type anomaly with an energy splitting of 1.4 K, indicating the existence of an internal field of 2.42 T at the RE site. The magnetic singlet ground state of ErBaSrCu{sub 3}O{sub 7} and DyBaSrCu{sub 3}O{sub 7} is produ ced by exchange interactions of -0.05 and -0.035 T f.u./{mu}{sub B}, respectively. (orig.).

  6. Characterization and Luminescence Properties of Color-Tunable Dy3+-Doped BaY2ZnO5 Nanophosphors

    Science.gov (United States)

    Sonika; Khatkar, S. P.; Khatkar, Avni; Kumar, Rajesh; Taxak, V. B.

    2015-01-01

    Dy3+-doped BaY2ZnO5 nanophosphors were successfully synthesized by use of a solution combustion process. The effects of sintering temperature and dysprosium concentration on the structural and luminescence characteristics of the phosphors were investigated. X-ray diffraction (XRD) analysis confirmed the formation of pure orthorhombic BaY2ZnO5 with the space group Pbnm at 1100°C. Morphological investigation revealed spherical nanoparticles with smooth surfaces. The luminescence features of the nanophosphor were studied by use of photoluminescence excitation (PLE) and photoluminescence emission (PL), with luminescence decay curves and color ( x, y) coordinates. On excitation at 355 nm, BaY2ZnO5 nanophosphor doped with trivalent dysprosium ion emits white light as a mixture of blue (4F9/2 → 6H15/2) and yellow (4F9/2 → 6H13/2) emission. Concentration quenching is explained on the basis of cross-relaxation between intermediate Dy3+ states. Thus, BaY2ZnO5:Dy3+ nanophosphor may be suitable for producing efficient white light for ultraviolet-light-emitting diodes (UV-LEDs), fluorescent lamps, and a variety of optical display panels.

  7. KCa4(BO33:Ln3+ (Ln = Dy, Eu, Tb phosphors for near UV excited white–light–emitting diodes

    Directory of Open Access Journals (Sweden)

    Allu Amarnath Reddy

    2013-02-01

    Full Text Available A series of doped KCa4(BO33:Ln3+ (Ln: Dy, Eu and Tb compositions were synthesized by solid–state reaction method and their photoluminescent properties were systematically investigated to ascertain their suitability for application in white light emitting diodes. The X–ray diffraction (XRD and nuclear magnetic resonance (MAS–NMR data indicates that Ln3+–ions are successfully occupied the non–centrosymmetric Ca2+ sites, in the orthorhombic crystalline phase of KCa4(BO33 having space group Ama2, without affecting the boron chemical environment. The present phosphor systems could be efficiently excitable at the broad UV wavelength region, from 250 to 350 nm, compatible to the most commonly available UV light–emitting diode (LED chips. Photoluminescence studies revealed optimal near white–light emission for KCa4(BO33 with 5 wt.% Dy3+ doping, while warm white–light (CIE; X = 0.353, Y = 0.369 is obtained at 1wt.% Dy3+ ion concentration. The principle of energy transfer between Eu3+ and Tb3+ also demonstrates the potential white–light from KCa4(BO33:Eu3+,Tb3+ phosphor. Whereas, single Tb3+ and Eu3+–doped systems showed bright green (Tb3+ and red (Eu3+ emissions, respectively. Having structural flexibility along with remarkable chemical/thermal stability and suitable quantum efficiency these phosphors can be promising candidates as white–light–emitter for near UV LEDs.

  8. Magnetization compensation and spin reorientation transition in ferrimagnetic DyCo5: Multiscale modeling and element-specific measurements

    Science.gov (United States)

    Donges, Andreas; Khmelevskyi, Sergii; Deak, Andras; Abrudan, Radu-Marius; Schmitz, Detlef; Radu, Ilie; Radu, Florin; Szunyogh, László; Nowak, Ulrich

    2017-07-01

    We use a multiscale approach linking ab initio calculations for the parametrization of an atomistic spin model with spin dynamics simulations based on the stochastic Landau-Lifshitz-Gilbert equation to investigate the thermal magnetic properties of the ferrimagnetic rare-earth transition-metal intermetallic DyCo5. Our theoretical findings are compared to elemental resolved measurements on DyCo5 thin films using the x-ray magnetic circular dichroism technique. With our model, we are able to accurately compute the complex temperature dependence of the magnetization. The simulations yield a Curie temperature of TC=1030 K and a compensation point of Tcomp=164 K , which is in a good agreement with our experimental result of Tcomp=120 K . The spin reorientation transition is a consequence of competing elemental magnetocrystalline anisotropies in connection with different degrees of thermal demagnetization in the Dy and Co sublattices. Experimentally, we find this spin reorientation in a region from TSR 1 ,2=320 to 360 K , whereas in our simulations the Co anisotropy appears to be underestimated, shifting the spin reorientation to higher temperatures.

  9. Local devitrification of Dy 3+ doped Ba 2TiSi 2O 8 glass by laser irradiation

    Science.gov (United States)

    Martín, L. L.; Haro-González, P.; Martín, I. R.; Puerto, D.; Solís, J.; Cáceres, J. M.; Capuj, N. E.

    2010-12-01

    The Ba 2TiSi 2O 8 (BTS) is a well known piezoelectric, ferroelectric and non-linear crystal. In this work, nanocrystals of BTS have been obtained by different thermal treatments of precursor glasses. The glasses were fabricated from BaO-TiO 2-SiO 2 and doped with Dy 2O 3 using the melt quenching method. Thermal treatment in an electrical furnace at 740 °C was used to obtain transparent glass ceramic samples, which are formed by an amorphous matrix containing BTS nanocrystals, with an average size of 35 nm confirmed by X-ray diffraction. Moreover, a localized area in the precursor glass has been irradiated by continuous wave (c.w.) Ar-laser or femtosecond (fs) pulsed laser. Evidence of the changes induced by laser irradiation is confirmed by spectroscopic comparison of irradiated regions with the precursor glass and glass ceramic samples. The emission spectra corresponding to the Dy 3+: 4F 9/2 → 6H 13/2 (578 nm), 4F 9/2 → 6H 11/2 (670 nm) and 4F 9/2 → 6H 9/2 (757 nm) transitions were obtained under laser excitation at 473 nm. These measurements confirm the incorporation of the Dy 3+ ions into the BTS nanocrystals which produces an enhancement of luminescence and makes it an attractive material for optical amplification.

  10. Operational experience of electronic active personal dosemeter and comparison with CaSo4:Dy TL dosemeter in Indian PHWR.

    Science.gov (United States)

    Singh, Vishwanath P; Managanvi, S S; Bihari, R R; Bhat, H R

    2013-01-01

    Direct reading dosemeter has been used for day-to-day radiation exposure control and management for last four decades in Indian nuclear power plants (NPPs). Recently new real time, alarm and pre-alarm on equivalent dose/dose rate, storage of dose/dose rate and maximum dose rate, user-friendly electronic active personal dosemeter (APD) has been implemented into practice for the first time at Kaiga Atomic Power Station-3&4,  of Indian NPPs. The dosemeter showed tolerance level (L) 0.1085±0.0450 compared with 0.1869±0.0729 (average±SD) for CaSO4:Dy, TL dosemeter, having narrow range trumpet curve, nil electromagnetic interference. Records of >29 000 for APD and TL dosemeter were analysed for comparasion of the measurement of the individual dose. APD followed general acceptance rule of ±25 % for dose >1 mSv. Monthly Station collective dose by TL dosemeters and APD for normal reactor operation as well as outage are found in good agreement. Operational experiences and statistical analysis support that an APD dosemeter is reasonably equivalent to CaSO4:Dy TL dosemeter. The accuracy, reproducibility and repeatability of the measurement of radiation for (137)Cs are comparable with CaSO4:Dy, TL dosemeter. Operational experience of APD during the normal operation as well as outage showed as one of the best ALARA tool for occupational dose monitoring, control, management and future outage planning.

  11. The normal and inverse magnetocaloric effect in RCu{sub 2} (R=Tb, Dy, Ho, Er) compounds

    Energy Technology Data Exchange (ETDEWEB)

    Zheng, X.Q., E-mail: zhengxq@ustb.edu.cn [School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083 (China); Xu, Z.Y. [National Institute of Metrology, Beijing 100029 (China); Zhang, B.; Hu, F.X. [State Key Laboratory for Magnetism, Institute of Physics, Chinese Academy of Sciences, Beijing 100190 (China); Shen, B.G., E-mail: shenbg@aphy.iphy.ac.cn [State Key Laboratory for Magnetism, Institute of Physics, Chinese Academy of Sciences, Beijing 100190 (China)

    2017-01-01

    Orthorhombic polycrystalline RCu{sub 2} (R=Tb, Dy, Ho and Er) compounds were synthesized and the magnetic properties and magnetocaloric effect (MCE) were investigated in detail. All of the RCu{sub 2} compounds are antiferromagnetic (AFM) ordered. As temperature increases, RCu{sub 2} compounds undergo an AFM to AFM transition at T{sub t} and an AFM to paramagnetic (PM) transition at T{sub N}. Besides of the normal MCE around T{sub N}, large inverse MCE around T{sub t} was found in TbCu{sub 2} compound. Under a field change of 0–7 T, the maximal value of inverse MCE is even larger than the value of normal MCE around T{sub N} for TbCu{sub 2} compound. Considering of the normal and inverse MCE, TbCu{sub 2} shows the largest refrigerant capacity among the RCu{sub 2} (R=Tb, Dy, Ho and Er) compounds indicating its potential applications in low temperature multistage refrigeration. - Highlights: • Large inverse magnetocaloric effect is observed in TbCu{sub 2} compound. • The AFM to AFM transition is observed in RCu{sub 2} (R=Tb, Dy, Ho, Er) compounds. • The MCE performance of TbCu{sub 2} compound is evaluated in a more comprehensively way.

  12. Efficiency enhancement in dye-sensitized solar cells with down conversion material ZnO: Eu3+, Dy3+

    Science.gov (United States)

    Yao, Nannan; Huang, Jinzhao; Fu, Ke; Liu, Shiyou; E, Dong; Wang, Yanhao; Xu, Xijin; Zhu, Min; Cao, Bingqiang

    2014-12-01

    The down conversion (DC) material ZnO: Eu3+, Dy3+ are synthesized by precipitation method and used to prepare the photo anode of dye-sensitized solar cells (DSSCs). The effects of down conversion material on the photoelectric performance of the DSSC were characterized by the X-ray diffraction (XRD), photoluminescence (PL), scanning electron microscope (SEM), current-voltage (I-V) curve, incident-photon-to-current conversion efficiency (IPCE) and UV-vis-NIR absorption spectroscopy. In this paper, Eu3+, Dy3+ codoped ZnO excited by from UV to blue light converts blue to red light emission, corresponding to the absorption region of the dye (N719). At the concentration 1.75% of ZnO: Eu3+, Dy3+ (weight ratio of DC to TiO2), the short-circuit current density and conversion efficiency of the DSSCs reached to the optimal values: 8.92 mA cm-2 and 4.48%, about 212% and 245% higher than with pure TiO2 and about 91.4% and 105% higher than with TiO2/graphene (G) structure, respectively. The research result reveals that the application of DC material can improve the efficiency of DSSCs.

  13. M rate at TE. Monitoring at TeV energies

    Energy Technology Data Exchange (ETDEWEB)

    Dorner, Daniela [Universitaet Wuerzburg (Germany); Bretz, Thomas [RWTH Aachen (Germany); Gonzalez, Magdalena; Alfaro, Ruben [Universidad Nacional Autonoma de Mexico (Mexico); Tovmassian, Gagik [Instituto de Astronomia Sede Ensenada (Mexico)

    2016-07-01

    A dedicated long-term monitoring programm at TeV energies has been started by the FACT project about four years ago. Being limited to one site, gaps due to the rotation of the Earth remain in the measured light curves. This makes it difficult to study typical variability time scales of few hours to one day. To allow for systematic studies of continuous observations over up to 12 hours, a second telescope is being installed at a site in about six hours distance in longitude. For the M rate at TE (Monitoring at TeV energies) telescope, a mount from a previous experiment is being refurbished and will be equipped with a new camera. Using silicon based photo sensors like in FACT, an excellent and stable performance will be achieved. M rate at TE is a joint project of German and Mexican universities which aims at extending the blazar monitoring to so far unexplored time ranges. In the presentation, the status of this emerging project is reported.

  14. Improved Growth Methods for LaBr3 Scintillation Radiation Detectors

    Energy Technology Data Exchange (ETDEWEB)

    McGregor, Douglas S

    2011-05-01

    The objective is to develop advanced materials for deployment as high-resolution gamma ray detectors. Both LaBr3 and CeBr3 are advanced scintillation materials, and will be studied in this research. Prototype devices, in collaboration Sandia National Laboratories, will be demonstrated along with recommendations for mass production and deployment. It is anticipated that improved methods of crystal growth will yield larger single crystals of LaBr3 for deployable room-temperature operated gamma radiation spectrometers. The growth methods will be characterized. The LaBr3 and CeBr3 scintillation crystals will be characterized for light yield, spectral resolution, and for hardness.

  15. Unge kontanthjælpsmodtagere i Brøndby

    OpenAIRE

    Mikkelsen, Caroline; Buus, Anniqa Kristine; Larsen, Jonas; Larsen, Andreas Peter

    2013-01-01

    Welfare recipients in Brøndby are categorized into groups based on social- psychologically factors and their ability to work. This project will examine why youths are placed in group 2 and 3. In doing so, the project look at the different groups and analyze them in relation to the municipality’s policies on welfare. In its analysis, the project focuses on the social and economic dimensions but this is interplayed with the politics of the municipality. The project is orientated by its case stu...

  16. High-speed CuBr brightness amplifier beam profile

    Science.gov (United States)

    Evtushenko, G. S.; Torgaev, S. N.; Trigub, M. V.; Shiyanov, D. V.; Evtushenko, T. G.; Kulagin, A. E.

    2017-01-01

    This paper addresses the experimental study of the beam profile of the CuBr brightness amplifier operating at a wide range of pulse repetition frequencies. The use of a medium-size gas discharge tube (2 cm) ensures the operation of the brightness amplifier both at typical PRFs (520 kHz) and at higher PRFs (up to 100 kHz), either with or without HBr additive. The effect of the active additive on the beam profile is demonstrated. The testing results on kinetic modeling of radial processes in the laser (brightness amplifier) plasma are also discussed.

  17. Brüssel enne Moskvat / Markus Meckel, Matthias Wissmann

    Index Scriptorium Estoniae

    Meckel, Markus

    2005-01-01

    Saksa liiduparlamendi sotsiaaldemokraatide fraktsiooni liikme Markus Meckeli ja Saksa liiduparlamendi Euroopa komisjoni esimehe Matthias Wissmanni avaldus, milles nad kutsuvad tunnistama Balti riikide ajalugu ja korraldama päev enne Moskvas toimuvat Teise maailmasõja lõppu tähistavat üritust Brüsselis sõja lõpu 60. aastapäeva mälestusürituse. Artikkel ilmus samaaegselt ajalehtedes International Herald Tribune, Die Welt, Die Presse, Le Figaro, Gazeta Wyborcza, Lietuvas rytas, Diena

  18. Brújula electrónica basada en magnetoimpedancia

    OpenAIRE

    Martín Aguilar, Héctor

    2013-01-01

    Se desarrollara un prototipo funcional de brújula electronica utilizando un sensor de campo magnético de alta sensibilidad basado en el fenómeno de Magneto-Impedancia Gigante (GMI). El trabajo es eminentemente práctico y el alumno utilizará equipamiento científico disponible en los grupos de investigación del Departamento. Tiene componentes relacionadas con los materiales magnéticos, el diseño de circuitos electromagnéticos y la instrumentación y control.

  19. Adidas Suomi Oy: Brändikuvan rakentaminen markkinoinnin keinoin

    OpenAIRE

    Leinonen, Miira

    2015-01-01

    Tämä opinnäytetyö tehtiin toimeksiantona Adidas Suomi Oy:lle syksyllä 2014. Opinnäytetyön tavoitteena oli selvittää muotialan mielipidevaikuttajien mielikuvat Adidaksesta ja sen merkittävimmistä kilpailijoista. Vertailtaviksi brändeiksi valittiin kuusi tärkeintä kilpailijaa, jotka ovat Converse, Karhu, New Balance, Nike, Puma ja Reebok. Opinnäytetyön toimeksiantaja Adidas Suomi Oy on osa kansainvälistä Adidas Group konsernia. Yritys on yksi maailman tunnetuimmista urheilumerkeistä ja toim...

  20. Taxonomic revision of Asian genus Glyptopetalum Thwaites (Celastraceae R. Br.

    Directory of Open Access Journals (Sweden)

    Ivan A. Savinov

    2014-12-01

    Full Text Available Taxonomic survey of Asian genus Glyptopetalum Thwaites (Celastraceae R. Br. is presented. Thirty five species taxa of Glyptopetalum are accepted, including one new species, G.  vidalii I. Savinov (Laos, Thailand, a new record for China, G. tonkinense Pitard (SE Yunnan and a new record for Cambodia,               G. quadrangulare Prain ex King, a new record for Indonesia – G. euonymoides Merr. and a new record for Philippines, Mindanao island – G. loheri Merr. 

  1. New Eudesmane Sesquiterpenoids from Salvia plebeia R. Br.

    Science.gov (United States)

    Ma, Lie-Feng; Wang, Peng-Fei; Wang, Ji-Dong; Tong, Xiang-Min; Shan, Wei-Guang; Zhang, Hui; Zhan, Zha-Jun

    2017-08-01

    Three new sesquiterpenoids, salplebeones A - C (1 - 3), were isolated from the ethanol-soluble extract of the aerial part of Salvia plebeia R. Br. Their structures were established by detailed analysis of NMR and MS spectra. Salplebeone A was an eudesmane lactone, while salplebeones B and C were rare eudesmane sesquiterpenoids, containing 12,8-lactam groups. Antiproliferative activities of salplebeones A - C to myeloid leukemia cell lines were evaluated. © 2017 Wiley-VHCA AG, Zurich, Switzerland.

  2. Propiconazole is a specific and accessible brassinosteroid (BR biosynthesis inhibitor for Arabidopsis and maize.

    Directory of Open Access Journals (Sweden)

    Thomas Hartwig

    Full Text Available Brassinosteroids (BRs are steroidal hormones that play pivotal roles during plant development. In addition to the characterization of BR deficient mutants, specific BR biosynthesis inhibitors played an essential role in the elucidation of BR function in plants. However, high costs and limited availability of common BR biosynthetic inhibitors constrain their key advantage as a species-independent tool to investigate BR function. We studied propiconazole (Pcz as an alternative to the BR inhibitor brassinazole (Brz. Arabidopsis seedlings treated with Pcz phenocopied BR biosynthetic mutants. The steady state mRNA levels of BR, but not gibberellic acid (GA, regulated genes increased proportional to the concentrations of Pcz. Moreover, root inhibition and Pcz-induced expression of BR biosynthetic genes were rescued by 24epi-brassinolide, but not by GA(3 co-applications. Maize seedlings treated with Pcz showed impaired mesocotyl, coleoptile, and true leaf elongation. Interestingly, the genetic background strongly impacted the tissue specific sensitivity towards Pcz. Based on these findings we conclude that Pcz is a potent and specific inhibitor of BR biosynthesis and an alternative to Brz. The reduced cost and increased availability of Pcz, compared to Brz, opens new possibilities to study BR function in larger crop species.

  3. Observation of an atomic exchange bias effect in DyCo4 film

    Science.gov (United States)

    Chen, Kai; Lott, Dieter; Radu, Florin; Choueikani, Fadi; Otero, Edwige; Ohresser, Philippe

    2015-12-01

    The fundamental important and technologically widely employed exchange bias effect occurs in general in bilayers of magnetic thin films consisting of antiferromagnetic and ferromagnetic layers where the hard magnetization behavior of an antiferromagnetic thin film causes a shift in the magnetization curve of a soft ferromagnetic film. The minimization of the single magnetic grain size to increase the storage density and the subsequent demand for magnetic materials with very high magnetic anisotropy requires a system with high HEB. Here we report an extremely high HEB of 4 Tesla observed in a single amorphous DyCo4 film close to room temperature. The origin of the exchange bias can be associated with the variation of the magnetic behavior from the surface towards the bulk part of the film revealed by X-ray absorption spectroscopy and X-ray magnetic circular dichroism techniques utilizing the bulk sensitive transmission and the surface sensitive total electron yield modes. The competition between the atomic exchange coupling in the single film and the Zeeman interaction lead to an intrinsic exchanged coupled system and the so far highest exchange bias effect HEB = 4 Tesla reported in a single film, which is accommodated by a partial domain wall formation.

  4. Fluorescein isothiocyanate-dyed mesoporous silica nanoparticles for tracking antioxidant delivery.

    Science.gov (United States)

    Rashidi, Ladan; Ganji, Fariba; Vasheghani-Farahani, Ebrahim

    2017-06-01

    This study investigated the cellular uptake of fluorescein isothiocyanate-labelled mesoporous silica nanoparticles (FITC-MSNs), amine-functionalised FITC-MSNs (AP-FITC-MSNs) and their gallic acid (GA)-loaded counterparts. Mesoporous silica nanoparticles were labelled with fluorescein isothiocyanate, functionalised by 3-aminopropyltriethoxysilane (APTES) (AP-FITC-MSNs) and then loaded by GA. All nanoparticles were characterised by transmission electron microscopy (TEM), Fourier transform infrared spectroscopy, and X-ray diffraction. The cytotoxicity of different concentrations of dyed nanoparticles was investigated using (3-(4,5-trihydroxybenzoic acid, dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide) assay and flow cytometry. TEM images showed that the average particle sizes of FITC-MSNs and AP-FITC-MSNs were about 100 and 110 nm, respectively. These nanoparticles were internalised by Caco-2 cells, accumulated and dispersed into the cytoplasm, nucleus, and subcellular organelles. Nanoparticles containing GA clearly decreased the viability of cells. FITC-MSNs showed no toxicity on Caco-2 cells at concentrations of ≤50 µg/ml. Functionalisation of FITC-MSNs using APTES decreased toxicity effects on the cells. It was found that FITC-MSNs can be applied at low concentrations as a marker in the cells. In addition, AP-FITC-MSNs showed better biocompatibility with Caco-2 cells than FITC-MSNs, because of their positive surface charges.

  5. Rare Earth Dopant (Nd, Gd, Dy, and Er Hybridization in Lithium Tetraborate

    Directory of Open Access Journals (Sweden)

    Tony D. Kelly

    2014-05-01

    Full Text Available The four dopants (Nd, Gd, Dy, and Er substitutionally occupy the Li+ sites in lithium tetraborate (Li2B4O7: RE glasses as determined by analysis of the extended X-ray absorption fine structure. The dopants are coordinated by 6-8 oxygen at a distance of 2.3 to 2.5 Å, depending on the rare earth. The inverse relationship between the RE¬ O coordination distance and rare earth (RE atomic number is consistent with the expected lanthanide atomic radial contraction with increased atomic number. Through analysis of the X-ray absorption near edge structure, the rare earth dopants adopt the RE3+ valence state. There are indications of strong rare earth 5d hybridization with the trigonal and tetrahedral formations of BO3 and BO4 based on the determination of the rare earth substitutional Li+ site occupancy from the X-ray absorption near edge structure data. The local oxygen disorder around the RE3+ luminescence centers evident in the structural determination of the various glasses, and the hybridization of the RE3+ dopants with the host may contribute to the asymmetry evident in the luminescence emission spectral lines. The luminescence emission spectra are indeed characteristic of the expected f-to-f transitions; however, there is an observed asymmetry in some emission lines.

  6. Dalla pizza alla cura dell'uomo: le abilità di RoDyMan

    Directory of Open Access Journals (Sweden)

    Nunzia Bonifati

    2014-12-01

    Full Text Available RoDyMan, acronym for Robotic Dynamic Manipulation, is a research project funded by the European Research Council to the CREATE Consortium and carried out at PRISMA Lab in the Department of Electrical Engineering and Information Technology of the University of Naples Federico II. The goal is the development of a service robot able to manipulate elastic and soft objects, which change continuously density and shape. These robots will be used not only in manufacturing but also as an aid to elderly or disabled people, for medical and surgical use, and in other manual activities. Preparing a pizza involves an extraordinary level of manual dexterity: for this reason a pizzaiolo robot has been conceived. It is also a tribute to Naples, at the forefront of technology, robotics and automation, but especially of culture and gastronomy, of which pizza is a symbol and tradition. Creating a robot able to manipulate objects like humans is one of the most sought and difficult challenges of robotics. It means to replicate skills that are the result of human biological and cultural evolution. This goal is arduous, mainly for two issues. First, we do not have a total knowledge of human nature, but this is the condition to be able to replicate the human functions in a machine. Second, there are many technical limits to implement a bio‐inspired robot, not the least those making it user‐friendly and aesthetically appreciated.

  7. Magnetic properties of CoFeB alloys doped with Dy and Pr

    Science.gov (United States)

    Kablov, E. N.; Ospennikova, O. G.; Piskorskii, V. P.; Valeev, R. A.; Korolev, D. V.; Koplak, O. V.; Kunitsyna, E. I.; Talantsev, A. D.; Morgunov, R. B.

    2015-06-01

    Powders of the ferrimagnetic alloy CoFeBDyPr have been synthesized by the gas atomization method. Annealing of the samples at 900°C leads to the recrystallization of the amorphous phase into the crystalline phase (Pr,Dy)2Fe7Co7B, which changes the magnetic properties of the alloy (the coercive force decreases, the shape of the magnetic hysteresis loop changes, etc.). The temperature dependences of the remanent magnetization and Mössbauer spectra depend on the size of particles. This indicates the contribution from subsurface magnetic states of the phase of different chemical composition, which is identified by X-ray photoelectron spectroscopy in particles with sizes of less than 10 μm. A weakening of the dipole-dipole interaction between particles in the sample, where they are diluted in the solid organic matrix (eicosane), leads to a change in the shape of the hysteresis loop. The elimination of the mechanical mobility of particles in eicosane significantly increases (to 2.5 times) the coercive force.

  8. Persistent phosphor SrAl₂O₄:Eu,Dy in outdoor conditions: saved by the trap distribution.

    Science.gov (United States)

    Botterman, Jonas; Smet, Philippe F

    2015-07-27

    Persistent phosphors are a specific type of luminescent materials having the unique ability to emit light long after the excitation has ended. They are commonly used as emergency signage in near ideal, isothermal indoor situations. Recently, their energy storage capacity was relied on for outdoor situations, e.g. for glow-in-the-dark road marks and in combination with solar cells and photo catalytic processes. In this work the influence of temperature, illumination intensity and the duration of the night is critically evaluated on the performance of afterglow phosphors. The persistent luminescence of SrAl2O4:Eu,Dy green emitting phosphors is studied under realistic and idealized conditions. It is found that the light output profile is hardly influenced by the ambient temperature in a wide range. This is due to the presence of a broad trap depth distribution, which is beneficial to cover the longer and colder winter nights. Temperature drops during the night are however detrimental. For traffic applications, the total light output of glow-in-the-dark road marks at the end of the night is not sufficient for the studied compound, although re-charging by the car's headlamps partially alleviates this. For energy storage applications, the trap density should be improved and tunneling recombination processes might be needed to overcome overnight temperature drops.

  9. Radiation sensitive indicator based on tetrabromophenol blue dyed poly(vinyl alcohol)

    Science.gov (United States)

    Beshir, W. B.

    2013-05-01

    Radiation sensitive indicators based on dyed polyvinyl alcohol (PVA) containing acid- sensitive dye (tetrabromophenol blue, TBPB) and chloral hydrate (CCl3·CH·(OH)2, 2,2,2-trichloroethane-1,1-diol) have been developed. These plastic film dosimeters undergo color change from blue (the alkaline form of TBPB) to yellow (the acidic form of TBPB), indicating acid formation. The concentration of radiation formed acids in the films containing different concentrations of chloral hydrate was calculated at different doses. These films can be used as dosimeters for food irradiation applications where the maximum of the useful dose ranges are between 1 and 8 kGy depending on chloral hydrate concentration in the film. The films have the advantage of negligible humidity effects on response in the intermediate range of relative humidity from 0 to 70% as good post irradiation stability when stored in the dark at room temperature. The overall combined uncertainty (at 2σ) associated with measurement of response (ΔA mm-1) at 623 nm for dose range 1-8 kGy is 4.53%.

  10. Magnetic interactions in anisotropic Nd-Dy-Fe-Co-B/α-Fe multilayer magnets

    Science.gov (United States)

    Dai, Z. M.; Liu, W.; Zhao, X. T.; Han, Z.; Kim, D.; Choi, C. J.; Zhang, Z. D.

    2016-10-01

    The magnetic properties and the possible interaction mechanisms of anisotropic soft- and hard-magnetic multilayers have been investigated by altering the thickness of different kinds of spacer layers. The metal Ta and the insulating oxides MgO, Cr2O3 have been chosen as spacer layers to investigate the characteristics of the interactions between soft- and hard-magnetic layers in the anisotropic Nd-Dy-Fe-Co-B/α-Fe multilayer system. The dipolar and exchange interaction between hard and soft phases are evaluated with the help of the first order reversal curve method. The onset of the nucleation field and the magnetization reversal by domain wall movement are also evident from the first-order-reversal-curve measurements. Reversible/irreversible distributions reveal the natures of the soft- and hard-magnetic components. Incoherent switching fields are observed and the calculations show the semiquantitative contributions of hard and soft components to the system. An antiferromagnetic spacer layer will weaken the interaction between ferromagnetic layers and the effective interaction length decreases. As a consequence, the dipolar magnetostatic interaction may play an important role in the long-range interaction in anisotropic multilayer magnets.

  11. Project DyAdd: Fatty acids in adult dyslexia, ADHD, and their comorbid combination.

    Science.gov (United States)

    Laasonen, Marja; Hokkanen, Laura; Leppämäki, Sami; Tani, Pekka; Erkkilä, Arja T

    2009-07-01

    In project DyAdd, we compared the fatty acid (FA) profiles of serum phospholipids in adults with attention deficit hyperactivity disorder (ADHD) (n=26), dyslexia (n=36), their comorbid combination (n=9), and healthy controls (n=36). FA proportions were analyzed in a 2x2 design with Bonferroni corrected post hoc comparisons. A questionnaire was used to assess dietary fat quality and use of supplements. Results showed that ADHD and dyslexia were not associated with total saturated FAs, monounsaturated FAs, or n-3 polyunsaturated FAs (PUFAs). However, those with ADHD had elevated proportions of total n-6 PUFAs (including gamma-linolenic and adrenic acids) as compared to those without ADHD. Dyslexia was related to a higher proportion of monounsaturated nervonic acid and a higher ratio of n-6/n-3 PUFAs. Among females none of the associations were significant. However in males, all the original associations observed in all subjects remained and ADHD was associated with elevated nervonic acid and n-6/n-3 PUFA ratio like dyslexia. Controlling for poorly diagnosed reading difficulties, education, dietary fat quality, or use of FA supplements did not generally remove the originally observed associations.

  12. Luminescence properties in the visible of Dy:YAG/YAG planar waveguides

    Energy Technology Data Exchange (ETDEWEB)

    Klimczak, M., E-mail: m.klimczak@elka.pw.edu.p [Institute of Microelectronics and Optoelectronics, Koszykowa 75, 00-662 Warsaw (Poland); Malinowski, M. [Institute of Microelectronics and Optoelectronics, Koszykowa 75, 00-662 Warsaw (Poland); Institute of Electronic Materials Technology, Wolczynska 133, 01-919 Warsaw (Poland); Sarnecki, J. [Institute of Electronic Materials Technology, Wolczynska 133, 01-919 Warsaw (Poland); Piramidowicz, R. [Institute of Microelectronics and Optoelectronics, Koszykowa 75, 00-662 Warsaw (Poland); Telekomunikacja Polska Research and Development Centre, Obrzezna 7, 02-691 Warsaw (Poland)

    2009-12-15

    In this work, we investigate visible emission properties of dysprosium-doped yttrium aluminum garnet (YAG) waveguides prepared by the liquid phase epitaxy (LPE) method, which allowed obtaining samples of activator concentrations ranging from 0.2 at% up to ca. 18 at%. This unique set of Dy:YAG/YAG waveguides has been carefully examined by means of highly resolved laser spectroscopy to explore the luminescence properties in the visible (yellow-blue) part of spectrum. In particular, the low-temperature absorption spectra have been recorded and analyzed, giving a more detailed information on energy levels' positions in these crystals. The concentration-dependant emission spectra and fluorescence dynamics profiles have been collected under direct excitation, enabling analysis of multi-ion processes responsible for concentration quenching. This, in turn, enabled optimization of activator concentration with respect to yellow emission efficiency. Additionally, the possible IR to visible up-conversion pathways have been discussed, giving a starting point for further investigations.

  13. Combustion synthesis and thermoluminescence in YAlO{sub 3}:Dy{sup 3+}

    Energy Technology Data Exchange (ETDEWEB)

    Dhadade, I. H., E-mail: idhadade@yahoo.com; Moharil, S. V.; Dhoble, S. J.; Rahangdale, S. R. [Department of Physics, RTM Nagpur University, Nagpur, 440010 (India)

    2016-05-06

    In the Y{sub 2}O{sub 3}-Al{sub 2}O{sub 3} system, compounds Y{sub 3}Al{sub 5}O{sub 12} (yttrium aluminum garnet, YAG),YAlO{sub 3} (yttrium aluminum perovskite, YAP), and Y{sub 4}Al{sub 2}O{sub 9}(yttrium aluminate monoclinic, YAM) are well known. Though several soft chemical routes have been explored for synthesis of YAG, YAP and YAM, most of these methods are complex. Moreover, phase pure materials are not obtained in one step and prolonged annealing at temperatures around 1000°C is necessary. In this paper, one step combustion synthesis of the compound YAlO{sub 3}:Dy{sup 3+} is reported using a modified procedure and employing mixed (glycine + urea) fuel. Powder X-ray diffraction patterns confirm the pervoskite phase of YAlO{sub 3}. Thermoluminescence study shows linear response in wide dose range (0.2 – 1 KGy) suggest the possibility of the present phosphor in dosimeter application.

  14. Natural Organobromine in Marine Sediments: New Evidence of Biogeochemical Br Cycling

    Energy Technology Data Exchange (ETDEWEB)

    A Leri; J Hakala; M Marcus; A Lanzirotti; C Reddy; S Myneni

    2011-12-31

    Organobromine (Br{sub org}) compounds, commonly recognized as persistent, toxic anthropogenic pollutants, are also produced naturally in terrestrial and marine systems. Several enzymatic and abiotic bromination mechanisms have been identified, as well as an array of natural Br{sub org} molecules associated with various marine organisms. The fate of the carbon-bromine functionality in the marine environment, however, remains largely unexplored. Oceanographic studies have noted an association between bromine (Br) and organic carbon (C{sub org}) in marine sediments. Even so, there has been no direct chemical evidence that Br in the sediments exists in a stable form apart from inorganic bromide (Br{sub inorg}), which is widely presumed conservative in marine systems. To investigate the scope of natural Br{sub org} production and its fate in the environment, we probed Br distribution and speciation in estuarine and marine sediments using in situ X-ray spectroscopy and spectromicroscopy. We show that Br{sub org} is ubiquitous throughout diverse sedimentary environments, occurring in correlation with C{sub org} and metals such as Fe, Ca, and Zn. Analysis of sinking particulate carbon from the seawater column links the Br{sub org} observed in sediments to biologically produced Br{sub org} compounds that persist through humification of natural organic matter (NOM). Br speciation varies with sediment depth, revealing biogeochemical cycling of Br between organic and inorganic forms as part of the burial and degradation of NOM. These findings illuminate the chemistry behind the association of Br with Corg in marine sediments and cast doubt on the paradigmatic classification of Br as a conservative element in seawater systems.

  15. Te hard van stapel gelopen.

    NARCIS (Netherlands)

    W-J. Verhoeven (Willem-Jan)

    2008-01-01

    textabstractHoe goed we ook trachten de samenleving te organiseren, fraude maakt er deel van uit. Dit blijkt uit spraakmakende grote schandalen zoals de Enron-zaak, de Bouwfraude-zaak en de Nigerian letter scams. Maar fraude komt ook op minder geruchtmakende schaal voor, zoals oplichting op

  16. Structural, spectral, dielectric and magnetic properties of Tb–Dy doped Li-Ni nano-ferrites synthesized via micro-emulsion route

    Energy Technology Data Exchange (ETDEWEB)

    Junaid, Muhammad, E-mail: junaid.malik95@yahoo.com [Department of Physics, The Islamia University of Bahawalpur, Bahawalpur 63100 (Pakistan); Khan, Muhammad Azhar, E-mail: azhar.khan@iub.edu.pk [Department of Physics, The Islamia University of Bahawalpur, Bahawalpur 63100 (Pakistan); Iqbal, F. [Department of Physics, The Islamia University of Bahawalpur, Bahawalpur 63100 (Pakistan); Murtaza, Ghulam [Centre for Advanced Studies in Physics, Government College University, Lahore 54000 (Pakistan); Akhtar, Majid Niaz; Ahmad, Mukhtar [Department of Physics, COMSATS Institute of Information Technology, Lahore 54000 (Pakistan); Shakir, Imran [Deanship of scientific research, College of Engineering, King Saud University, PO Box 800, Riyadh 11421 (Saudi Arabia); Warsi, Muhammad Farooq [Department of Chemistry, The Islamia University of Bahawalpur, Bahawalpur 63100 (Pakistan)

    2016-12-01

    Terbium (Tb) and dysprosium (Dy) doped lithium-nickel nano-sized ferrites (Li{sub 0.2}Ni{sub 0.8}Tb{sub 0.5x}Dy{sub 0.5x}Fe{sub 2−x}O{sub 4} where x=0.00−0.08) were prepared by micro-emulsion technique. The X-ray diffraction (XRD) patterns confirmed the single phase cubic spinel structure. The lattice constant was increased due to larger ionic radii of Tb{sup 3+} and Dy{sup 3+} cations. The crystallite size was found in the range 30–42 nm. The FTIR (Fourier transform infrared spectroscopy) spectra revealed two significant absorption bands (~400–600 cm{sup −1}) which indicate the formation of cubic spinel structure. The peaking behavior of dielectric parameters was observed beyond 1.5 GHz. The dielectric constant and dielectric loss were found to decrease by the increase of Tb–Dy contents and frequency. The doping of Tb and Dy in Li–Ni ferrites led to increase the coercive field (120–156 Oe). The smaller magnetic and dielectric parameters suggested the possible utility of these nano-materials in switching and microwave devices applications. - Highlights: • Li{sub 0.2}Ni{sub 0.8}Tb{sub 0.5x}Dy{sub 0.5x}Fe{sub 2-x}O{sub 4} ferrites were synthesized by micro-emulsion route. • Tb and Dy addition improves coercivity while decreased saturation magnetization. • These nanomaterials can be useful in microwave and switching devices applications.

  17. Application of a novel alkali-tolerant thermostable DyP-type peroxidase from Saccharomonospora viridis DSM 43017 in biobleaching of eucalyptus kraft pulp.

    Directory of Open Access Journals (Sweden)

    Wangning Yu

    Full Text Available Saccharomonospora viridis is a thermophilic actinomycete that may have biotechnological applications because of its dye decolorizing activity, though the enzymatic oxidative system responsible for this activity remains elusive. Bioinformatic analysis revealed a DyP-type peroxidase gene in the genome of S. viridis DSM 43017 with sequence similarity to peroxidase from dye-decolorizing microbes. This gene, svidyp, consists of 1,215 bp encoding a polypeptide of 404 amino acids. The gene encoding SviDyP was cloned, heterologously expressed in Escherichia coli, and then purified. The recombinant protein could efficiently decolorize several triarylmethane dyes, anthraquinonic and azo dyes under neutral to alkaline conditions. The optimum pH and temperature for SviDyP was pH 7.0 and 70°C, respectively. Compared with other DyP-type peroxidases, SviDyP was more active at high temperatures, retaining>63% of its maximum activity at 50-80°C. It also showed broad pH adaptability (>35% activity at pH 4.0-9.0 and alkali-tolerance (>80% activity after incubation at pH 5-10 for 1 h at 37°C, and was highly thermostable (>60% activity after incubation at 70°C for 2 h at pH 7.0. SviDyP had an accelerated action during the biobleaching of eucalyptus kraft pulp, resulting in a 21.8% reduction in kappa number and an increase of 2.98% (ISO in brightness. These favorable properties make SviDyP peroxidase a promising enzyme for use in the pulp and paper industries.

  18. Optimizing white light luminescence in Dy{sup 3+}-doped Lu{sub 3}Ga{sub 5}O{sub 12} nano-garnets

    Energy Technology Data Exchange (ETDEWEB)

    Haritha, P.; Linganna, K.; Venkatramu, V., E-mail: vvramuphd@gmail.com [Department of Physics, Yogi Vemana University, Kadapa - 516 003 (India); Martín, I. R.; Monteseguro, V.; Rodríguez-Mendoza, U. R. [Department of Physics, and MALTA Consolider Team, Universidad de La Laguna, 38200 San Cristóbal de La Laguna, Santa Cruz de Tenerife (Spain); Instituto Universitario de Materiales y Nanotecnología, Universidad de La Laguna, 38200 San Cristóbal de La Laguna, Santa Cruz de Tenerife (Spain); Babu, P. [Department of Physics, Government Degree College, Satyavedu - 517 588 (India); León-Luis, S. F. [Department of Physics, and MALTA Consolider Team, Universidad de La Laguna, 38200 San Cristóbal de La Laguna, Santa Cruz de Tenerife (Spain); Jayasankar, C. K. [Department of Physics, Sri Venkateswara University, Tirupati - 517 502 (India); Lavín, V. [Department of Physics, and MALTA Consolider Team, Universidad de La Laguna, 38200 San Cristóbal de La Laguna, Santa Cruz de Tenerife (Spain); Instituto Universitario de Estudios Avanzados en Atómica, Molecular y Fotónica, Universidad de La Laguna, 38200 San Cristóbal de La Laguna, Santa Cruz de Tenerife (Spain)

    2014-11-07

    Trivalent dysprosium-doped Lu{sub 3}Ga{sub 5}O{sub 12} nano-garnets have been prepared by sol-gel method and characterized by X-ray powder diffraction, high-resolution transmission electron microscopy, dynamic light scattering, and laser excited spectroscopy. Under a cw 457 nm laser excitation, the white luminescence properties of Lu{sub 3}Ga{sub 5}O{sub 12} nano-garnets have been studied as a function of the optically active Dy{sup 3+} ion concentration and at low temperature. Decay curves for the {sup 4}F{sub 9/2} level of Dy{sup 3+} ion exhibit non-exponential nature for all the Dy{sup 3+} concentrations, which have been well-fitted to a generalized energy transfer model for a quadrupole-quadrupole interaction between Dy{sup 3+} ions without diffusion. From these data, a simple rate-equations model can be applied to predict that intense white luminescence could be obtained from 1.8 mol% Dy{sup 3+} ions-doped nano-garnets, which is in good agreement with experimental results. Chromaticity color coordinates and correlated color temperatures have been determined as a function of temperature and are found to be within the white light region for all Dy{sup 3+} concentrations. These results indicate that 2.0 mol% Dy{sup 3+} ions doped nano-garnet could be useful for white light emitting device applications.

  19. Structural characterization and photoluminescence properties of sol–gel derived nanocrystalline BaMoO{sub 4}:Dy{sup 3+}

    Energy Technology Data Exchange (ETDEWEB)

    Jena, Paramananda [Department of physics, Pondicherry University, Pondicherry 605014 (India); Gupta, Santosh K., E-mail: santufrnd@gmail.com [Radiochemistry Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400085 (India); Natarajan, V. [Radiochemistry Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400085 (India); Sahu, Manjulata [Radioanalytical Chemistry Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400085 (India); Satyanarayana, N., E-mail: nallanis2011@gmail.com [Department of physics, Pondicherry University, Pondicherry 605014 (India); Venkateswarlu, M. [R and D Amara Raja Batteries Ltd., Karakambadi 517501, A.P., India. (India)

    2015-02-15

    Nanocrystalline BaMoO{sub 4} samples doped with varying Dy{sup 3+} content were prepared by acrylamide assisted sol–gel combustion process. The prepared samples were characterized by X-ray diffraction (XRD), Fourier transform Raman spectroscopy (FT-Raman), Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM) and photoluminescence (PL) techniques. The crystalline phase and structure of all the Dy{sup 3+} doped BaMoO{sub 4} prepared samples were confirmed from the analysis of the obtained results of XRD, FT-Raman and FTIR. The average crystallite sizes of all the prepared samples, calculated using Scherrer's formula and XRD data, were found to be less than 100 nm. Microstructures of all the prepared Dy{sup 3+} doped BaMoO{sub 4} samples were analyzed from the obtained SEM micrographs. Excitation, emission and lifetime spectroscopic studies of undoped and Dy{sup 3+} doped BaMoO{sub 4} were carried out. Effect of concentration of Dy{sup 3+} on the luminescence properties of the prepared phosphors viz. emission intensity and PL decay, was also investigated. Based on critical distance calculation, mechanism for concentration quenching was proposed. Undoped sample was found to give reddish blue emission, whereas doped samples showed yellowish white emission. - Highlights: • Characterization of BaMoO{sub 4}:Dy{sup 3+} samples by XRD, SEM, FTIR, Raman and PL. • Effect of concentration on luminescence properties. • Evidence for the presence of two rare earth ion sites in the matrix. • Near white emission from BaMoO{sub 4}:Dy{sup 3+}.

  20. Temperature effect on fluorescence and UV-vis absorption spectroscopic properties of Dy(III) in molten LiCl-KCl eutectic salt

    Energy Technology Data Exchange (ETDEWEB)

    Kim, Bong Young [Department of Nuclear and Quantum Engineering, KAIST, 291 Daehak-ro, Yuseong-gu, Daejeon 305-701 (Korea, Republic of); Yun, Jong-Il, E-mail: jiyun@kaist.ac.kr [Department of Nuclear and Quantum Engineering, KAIST, 291 Daehak-ro, Yuseong-gu, Daejeon 305-701 (Korea, Republic of)

    2012-11-15

    The spectroscopic properties of Dy(III) in molten LiCl-KCl eutectic salt at high temperature were investigated by time-resolved laser fluorescence spectroscopy (TRLFS) and UV-vis absorption spectroscopy. For the first time, a visible fluorescence of Dy(III) in high-temperature LiCl-KCl eutectic salt was measured due to the electronic transitions from {sup 4}I{sub 13/2} and {sup 4}F{sub 9/2} to {sup 6}H{sub J/2} (J=7, Horizontal-Ellipsis ,15). The effect of temperature on hypersensitivity for the electronic transitions from the {sup 4}I{sub 13/2} excited state ({approx}25700 cm{sup -1}) of Dy(III) was confirmed by altering temperature in chloride eutectic salt in accord with optical absorption measurements. The molar absorptivity of {sup 4}I{sub 13/2} Leftwards-Arrow {sup 6}H{sub 15/2} was enhanced with increasing temperature. The fluorescence intensity of Dy(III) followed a simple mono-exponential decay curve, suggesting the formation of a single chemical species in high-temperature LiCl-KCl molten salt. - Highlights: Black-Right-Pointing-Pointer Spectroscopic characteristics of Dy(III) in the high-temperature LiCl-KCl salt. Black-Right-Pointing-Pointer In-situ chemical analysis of Dy(III) by fluorescence and absorbance measurement. Black-Right-Pointing-Pointer Temperature effect on hypersensitivity for electronic transitions from {sup 4}I{sub 13/2} excited state. Black-Right-Pointing-Pointer Single chemical species of Dy(III) exists in high-temperature LiCl-KCl salt.

  1. Water-resistant, monodispersed and stably luminescent CsPbBr3/CsPb2Br5 core-shell-like structure lead halide perovskite nanocrystals

    Science.gov (United States)

    Qiao, Bo; Song, Pengjie; Cao, Jingyue; Zhao, Suling; Shen, Zhaohui; Gao, Di; Liang, Zhiqin; Xu, Zheng; Song, Dandan; Xu, Xurong

    2017-11-01

    Lead halide perovskite materials are thriving in optoelectronic applications due to their excellent properties, while their instability due to the fact that they are easily hydrolyzed is still a bottleneck for their potential application. In this work, water-resistant, monodispersed and stably luminescent cesium lead bromine perovskite nanocrystals coated with CsPb2Br5 were obtained using a modified non-stoichiometric solution-phase method. CsPb2Br5 2D layers were coated on the surface of CsPbBr3 nanocrystals and formed a core-shell-like structure in the synthetic processes. The stability of the luminescence of the CsPbBr3 nanocrystals in water and ethanol atmosphere was greatly enhanced by the photoluminescence-inactive CsPb2Br5 coating with a wide bandgap. The water-stable enhanced nanocrystals are suitable for long-term stable optoelectronic applications in the atmosphere.

  2. Desorption of Te capping layer from ZnTe (100): Auger spectroscopy ...

    African Journals Online (AJOL)

    ... configurations of tellurium Te (c (2x2)) and Te (c (2x1)) are confirmed by scanning tunneling microscopy (STM). Such a study reveals a phase transition from a rich-Te to a poor-Te surface as the annealing temperature increases. Keywords: Zinc Tellure; solar cells; structural properties; optoelectronics; semiconductors.

  3. Theoretical electronic structure of the cadmium monohalide molecules CdX (X = F, Cl, Br, I)

    Science.gov (United States)

    Badreddine, Khalil; Korek, Mahmoud

    2017-10-01

    The potential energy and dipole moment curves for the lowest electronic states in the representation 2s+1Λ(±) of CdX (X = F, Cl, Br, I) molecules are investigated via complete active space self-consistent field (CASSCF) and multi-reference configuration interaction MRCI (single and double excitation with Davidson correction). For the bound states of CdX diatomic molecules the bond distances Re, the vibrational harmonic frequencies ωe, the rotational constants Be, the electronic energies relative to the ground state Te, and the permanent and transition dipole moments have been computed. The dissociation energy limits of the atomic levels of CdX compounds are also calculated. The transition dipole moment between the ground state X2Σ+ and (2)2Σ+ is investigated. Consequently, the transition dipole moment values of the upper state at its equilibrium position |μ21 |, the emission angular frequency ω21, the Einstein coefficients of spontaneous and induced emissions (A21 and B21ω), the spontaneous radiative lifetime τspon, the emission cross section σ0, the line strength and the emission oscillator strength f21 are calculated along with the ionicity of the X2Σ+ and (2)2Σ+ states. The eigenvalues Ev, the rotational constants Bv, the centrifugal distortion constants Dv and the abscissas of the turning points Rmin and Rmax of X2Σ+ states of the CdX diatomics are computed. The comparison of the results with those available in literature shows a very good agreement.

  4. SM-like Higgs decay into two muons at 1.4 TeV CLIC

    CERN Document Server

    Milutinovic-Dumbelovic, G

    2014-01-01

    The potential for measuring the Standard Model (SM) Higgs boson decay into two muons at a 1.4 TeV CLIC e+e− collider is addressed in this paper, that was presented at ICHEP2014. The study is performed in the full Geant4 detector simulations of CLIC_ILD, taking into consideration all the relevant physics and the beam-induced background processes, as well as the instrumentation of the very forward region to tag forward electrons. In this analysis we show that the branching ratio BR(H-->mu+mu-) times the Higgs production cross-section can be measured with 38% statistical accuracy at √s =1.4 TeV using an integrated luminosity of 1.5 ab-1. This study is part of an ongoing comprehensive Higgs physics benchmark study covering various Higgs production processes and decay modes, currently being carried out to estimate the full Higgs physics potential of CLIC.

  5. SM-like Higgs decay into two muons at 1.4 TeV CLIC

    CERN Document Server

    Milutinovic-Dumbelovic, Gordana

    2016-01-01

    The branching fraction measurement of the SM-like Higgs boson decay into two muons at 1.4 TeV CLIC will be described in this paper contributed to the LCWS13. The study is performed in the fully simulated ILD detector concept for CLIC, taking into consideration all the relevant physics and the beam-induced backgrounds, as well as the instrumentation of the very forward region to tag the high-energy electrons. Higgs couplings are known to be sensitive to BSM physics and we prove that BR times the Higgs production cross section can be measured with approximately 35.5% statistical accuracy in four years of the CLIC operation at 1.4 TeV centre-of-mass energy with unpolarised beams. The result is preliminary as the equivalent photon approximation is not considered in the cross-section calculations. This study complements the Higgs physics program foreseen at CLIC.

  6. S and Te inter-diffusion in CdTe/CdS hetero junction

    Energy Technology Data Exchange (ETDEWEB)

    Enriquez, J. Pantoja [Cuerpo Academico-Energia y Sustentabilidad, Universidad Politecnica de Chiapas, Eduardo J. Selvas S/N, Col. Magisterial, Tuxtla Gutierrez 29010, Chiapas (Mexico); Gomez Barojas, E. [CIDS-ICUAP, Apdo. Postal 1651, 72000 Puebla (Mexico); Silva Gonzalez, R.; Pal, U. [Instituto de Fisica, Benemerita Universidad Autonoma de Puebla, Puebla (Mexico)

    2007-09-22

    Effects of post formation thermal annealing of the CdTe-CdS device on the inter-diffusion of S and Te at the junction in a substrate configuration device have been studied by Auger electron spectroscopy. While the migration of S and Te atoms increases with annealing temperature, the extent of S diffusion is always higher than the diffusion of Te atoms. Inter-diffusion of S and Te causes the formation of CdTe{sub 1-x}S{sub x} ternary compound at the CdTe-CdS interface. (author)

  7. Fletching-shaped Bi4Te3–ZnTe heterostructure nanowires.

    Science.gov (United States)

    Song, Man Suk; Kim, Yong

    2014-12-19

    We investigated Bi(4)Te(3)-ZnTe axial heterostructure nanowires grown by physical vapor transport at the substrate temperature of 450 °C, utilizing ZnTe as the source and Bi(2)Te(3) as the catalyst. The temperatures of the source and catalyst materials were individually controlled by separating the source and catalyst boats. The axial heterostructure nanowires consisted of ZnTe and Bi(4)Te(3) segments. The Bi(4)Te(3) segment had an interesting fletching shape with three wings surrounded by a ZnO shell. A systematic redshift in the nanowire's photoluminescence was observed as the excitation laser spot was moved from the heterojunction toward the root of the ZnTe segment, attributed to the formation of deep defect states under the Te-rich environment that resulted from using Bi(2)Te(3) as the catalyst instead of Bi.

  8. CdTe-HgTe core-shell nanowire growth controlled by RHEED

    Science.gov (United States)

    Kessel, M.; Hajer, J.; Karczewski, G.; Schumacher, C.; Brüne, C.; Buhmann, H.; Molenkamp, L. W.

    2017-07-01

    We present results on the growth of CdTe-HgTe core-shell nanowires, a realization of a quasi-one-dimensional heterostructure of the topological insulator HgTe. The growth is a two step process consisting of the growth of single crystalline zinc blende CdTe nanowires with the vapor-liquid-solid method and the overgrowth of these wires with HgTe such that a closed shell is formed around the CdTe core structure. The CdTe wire growth is monitored by RHEED allowing us to infer information on the crystal properties from the electron diffraction pattern. This information is used to find and control the optimal growth temperature. High quality single crystal CdTe nanowires grow with a preferred orientation. For the growth of the conductive HgTe shell structure we find that the supplied Hg:Te ratio is the crucial parameter to facilitate growth on all surface facets.

  9. Total Absorption Gamma-Ray Spectroscopy of 87Br, 88Br and 94Rb Beta-Delayed Neutron Emitters

    CERN Document Server

    Valencia, E; Algora, A; Agramunt, J; Rubio, B; Rice, S; Gelletly, W; Regan, P; Zakari-Issoufou, A -A; Fallot, M; Porta, A; Rissanen, J; Eronen, T; Aysto, J; Batist, L; Bowry, M; Bui, V M; Caballero-Folch, R; Cano-Ott, D; Elomaa, V -V; Estevez, E; Farrelly, G F; Garcia, A R; Gomez-Hornillos, B; Gorlychev, V; Hakala, J; Jordan, M D; Jokinen, A; Kolhinen, V S; Kondev, F G; Martinez, T; Mendoza, E; Moore, I; Penttila, H; Podolyak, Zs; Reponen, M; Sonnenschein, V; Sonzogni, A A

    2016-01-01

    We investigate the decay of 87Br, 88Br and 94Rb using total absorption gamma-ray spectroscopy. These important fission products are beta-delayed neutron emitters. Our data show considerable gamma-intensity, so far unobserved in high-resolution gamma-ray spectroscopy, from states at high excitation energy. We also find significant differences with the beta intensity that can be deduced from existing measurements of the beta spectrum. We evaluate the impact of the present data on reactor decay heat using summation calculations. Although the effect is relatively small it helps to reduce the discrepancy between calculations and integral measurements of the photon component for 235U fission at cooling times in the range 1 to 100 s. We also use summation calculations to evaluate the impact of present data on reactor antineutrino spectra. We find a significant effect at antineutrino energies in the range of 5 to 9 MeV. In addition, we observe an unexpected strong probability for gamma emission from neutron unbound s...

  10. Precision measurement of the ratio BR(K→π+π-e+e-)/BR(K→π+π-πD0)

    Science.gov (United States)

    NA48/1 Collaboration; Batley, J. R.; Kalmus, G. E.; Lazzeroni, C.; Munday, D. J.; Patel, M.; Slater, M. W.; Wotton, S. A.; Arcidiacono, R.; Bocquet, G.; Ceccucci, A.; Cundy, D.; Doble, N.; Falaleev, V.; Gatignon, L.; Gonidec, A.; Grafström, P.; Kubischta, W.; Marchetto, F.; Mikulec, I.; Norton, A.; Panzer-Steindel, B.; Rubin, P.; Wahl, H.; Goudzovski, E.; Hristov, P.; Kekelidze, V.; Kozhuharov, V.; Litov, L.; Madigozhin, D.; Molokanova, N.; Potrebenikov, Yu.; Stoynev, S.; Zinchenko, A.; Monnier, E.; Swallow, E. C.; Winston, R.; Sacco, R.; Walker, A.; Baldini, W.; Dalpiaz, P.; Frabetti, P. L.; Gianoli, A.; Martini, M.; Petrucci, F.; Savrié, M.; Scarpa, M.; Calvetti, M.; Collazuol, G.; Iacopini, E.; Ruggiero, G.; Bizzeti, A.; Lenti, M.; Veltri, M.; Behler, M.; Eppard, K.; Eppard, M.; Hirstius, A.; Kleinknecht, K.; Koch, U.; Marouelli, P.; Masetti, L.; Moosbrugger, U.; Morales Morales, C.; Peters, A.; Wanke, R.; Winhart, A.; Dabrowski, A.; Fonseca Martin, T.; Szleper, M.; Velasco, M.; Anzivino, G.; Imbergamo, E.; Lamanna, G.; Lubrano, P.; Michetti, A.; Nappi, A.; Piccini, M.; Valdata-Nappi, M.; Cenci, P.; Pepe, M.; Petrucci, M. C.; Cerri, C.; Fantechi, R.; Mannelli, I.; Costantini, F.; Fiorini, L.; Giudici, S.; Pierazzini, G.; Sozzi, M.; Cheshkov, C.; Chèze, J. B.; de Beer, M.; Debu, P.; Gouge, G.; Marel, G.; Mazzucato, E.; Peyaud, B.; Vallage, B.; Holder, M.; Maier, A.; Ziolkowski, M.; Biino, C.; Cartiglia, N.; Clemencic, M.; Lopez, S. Goy; Menichetti, E.; Pastrone, N.; Wislicki, W.; Dibon, H.; Jeitler, M.; Markytan, M.; Neuhofer, G.; Widhalm, L.

    2011-01-01

    The K→π+π-e+e- decay mode was investigated using the data collected in 2002 by the NA48/1 Collaboration. With about 23 k K→π+π-e+e- events and 59 k K→π+π-πD0 normalization decays, the K→π+π-e+e- branching ratio relative to the K→π+π-πD0 one was determined to be BR(K→π+π-e+e-)/BR(K→π+π-πD0)=(3.28±0.06±0.04)×10-2. This result was used to set the upper limit |g/g|<3.0 at 90% CL on the presence, in the decay amplitude, of an E1 direct emission (g) term relative to the dominant inner bremsstrahlung (g) term. The CP-violating asymmetry A in the sinϕcosϕ distribution of K→π+π-e+e- events, where ϕ is the angle between the π+π- and the e+e- decay planes in the kaon centre of mass, was found to be A=(-0.4±0.8)%, consistent with zero. These results are in good agreement with a description of the K→π+π-e+e- decay amplitude dominated by the CP-even inner bremsstrahlung process.

  11. Estimating Stratospheric and Tropospheric BrO columns using GEOSCCM and the Ozone Monitoring Instrument

    Science.gov (United States)

    Liang, Q.; Chance, K.; Suleiman, R. M.; Zhang, Y.

    2013-12-01

    Atmospheric BrO is an important gas - despite its very low abundance of parts per trillion, and it plays an important chemical role in the destruction of ozone in the troposphere and the stratosphere. The current atmospheric BrO abundance estimates are highly uncertain due to significant uncertainties in the contribution of very-short-lived (VSL) bromocarbons, in contrast to the well-quantified contribution from the long-lived bromine-containing compounds, i.e. Halons and CH3Br. This is particularly true in the troposphere with various measurements suggesting the presence of a global background BrO from 0.5 ppt to 2 ppt, and, locally, BrO can be as high as 30 ppt in the Arctic and Antarctic marine boundary layer. We will run a 10-year model simulation between 2001-2010 using the NASA GEOS Chemistry Climate Model (GEOSCCM) V2 which contains a detailed stratospheric chemistry coupled with an interactive VSL bromocarbon chemistry. BrO in the troposphere will be relaxed to monthly mean BrO fields previously archived during a GEOS-Chem full chemistry simulation. The simulated VSL bromocarbons and BrO from both models have been extensively evaluated and compare well with aircraft, balloon-borne and GOME-2 satellite observations. We will analyze the model simulated BrO together with satellite BrO measurements from the Ozone Monitoring Instrument (OMI) to address the following three questions: 1) How much BrO is present in the stratosphere and the troposphere? 2) What is the relative contribution of the stratosphere and the troposphere to total atmospheric BrO column abundance? 3) What drives the seasonal and geographical variability of stratospheric and tropospheric BrO columns?

  12. A comparison of different LaTeX programs

    NARCIS (Netherlands)

    Koning, Ruud H.

    2001-01-01

    In this review two commercial and two freeware LaTeX implementations are discussed and compared: teTeX (Linux, Unix) pcTeX32 (Windows 3.1, Windows95/98/NT) Scientific Workplace (Windows95/98/NT) mikTeX (Windows95/98/NT) Keywords: LaTeX, word processing

  13. Magnetic, Caloric and Crystallographic Properties of Dy5(SixGe1-x)4 Alloys

    Energy Technology Data Exchange (ETDEWEB)

    Ivchenko, Vitaliy Vladislavovich [Iowa State Univ., Ames, IA (United States)

    2002-01-01

    A study of a series of Dy5(SixGe1-x)4 alloys using dc and ac magnetic susceptibility, magnetization, heat capacity, and x-ray powder diffraction techniques revealed that the variation of the magnetic properties and crystal structures with composition is similar to that observed in the Gd5(SixGe1-x)4 system, except that the magnetic ordering temperatures are lower. The magnetic phase transition temperatures vary from ~ 46K (Dy5Ge4) to ~ 137K (Dy5Si4). The intermediate ternary phase Dy5Si3Ge undergoes a first order magnetic phase transition at ~ 65K. The value of magnetic entropy change for this composition is quite large (-34J/kgK for magnetic field change from 0 to 50kOe), compared to the values for the two end members (-7 J/kgK for Dy5Ge4 and -12.5J/kgK for Dy5Si4). The magnetization and ac susceptibility measurements showed that alloys with monoclinic crystal structure have a non-collinear ordering of the magnetic moments at low temperatures. The alloy Dy5Si3Ge appears to exhibit a FM phase transition below the Curie temperature at 65K. Also a series of critical fields are observed at low temperature during magnetization vs magnetic field measurements in all of the Dy5(SixGe1-x)4 alloys regardless type of crystal structure. The Dy5(SixGe1-x)4 alloys, where 0.67≤x≤1, may be useful magnetic refrigerant materials in the ~50 to ~160K temperature range.

  14. Down-shifting by energy transfer in Tb{sup 3+}/Dy{sup 3+} co-doped zinc phosphate glasses

    Energy Technology Data Exchange (ETDEWEB)

    Caldiño, U., E-mail: cald@xanum.uam.mx [Departamento de Física, Universidad Autónoma Metropolitana-Iztapalapa, P.O. Box 55-534, México, D.F. 09340 (Mexico); Muñoz H, G.; Camarillo, I. [Departamento de Física, Universidad Autónoma Metropolitana-Iztapalapa, P.O. Box 55-534, México, D.F. 09340 (Mexico); Speghini, A. [Dipartimento di Biotecnologie, Università di Verona, and INSTM, UdR Verona, Strada Le Grazie 15, I-37314 Verona (Italy); IFAC CNR, Nello Carrara Institute of Applied Physics, MDF Lab, I-50019 Sesto Fiorentino, FI (Italy); Bettinelli, M. [Dipartimento di Biotecnologie, Università di Verona, and INSTM, UdR Verona, Strada Le Grazie 15, I-37314 Verona (Italy)

    2015-05-15

    An optical spectroscopy investigation of zinc phosphate glasses activated with Tb{sup 3+}/Dy{sup 3+} ions is carried out through photoluminescence spectra and decay time measurements. The emission color can be adjusted from yellow–green light, with CIE1931 chromaticity coordinates (0.36,0.44), toward the white light region (0.35,0.39) by decreasing the Tb{sup 3+} content from 1.0 to 0.1 mol% of Tb(PO{sub 3}){sub 3} upon Dy{sup 3+} excitation at 423 nm. Such visible region luminescence is generated by {sup 5}D{sub 4}→{sup 7}F{sub 5} and {sup 5}D{sub 4}→{sup 7}F{sub 3} emissions of Tb{sup 3+} in addition to {sup 4}I{sub 15/2}→{sup 6}H{sub 15/2}, {sup 4}F{sub 9/2}→{sup 6}H{sub 15/2}, {sup 4}F{sub 9/2}→{sup 6}H{sub 13/2} and {sup 4}F{sub 9/2}→{sup 6}H{sub 11/2} emissions of Dy{sup 3+}, so that Tb{sup 3+} emission is sensitized by Dy{sup 3+} through a non-radiative resonant energy transfer. A dominant {sup 5}D{sub 4}→{sup 7}F{sub 5} green emission is observed in detriment of the {sup 5}D{sub 3}→{sup 7}F{sub J} blue emissions upon 282 nm excitation, as well as an extended excitation range (280–500 nm), due to multiple Dy{sup 3+} and Tb{sup 3+} transitions, which might contribute to enhance the spectral response of solar photovoltaic cells by down-shifting of the incident solar spectrum. - Highlights: • Zn(PO{sub 3}){sub 2} glasses are optically activated with Tb{sup 3+}/Dy{sup 3+} (ZPTbDy). • Non-radiative resonant energy transfer takes place between Tb{sup 3+} and Dy{sup 3+}. • Luminescence can be adjusted from yellow–green light toward the white light region. • ZPTbDy phosphor exhibits spectroscopic properties for photovoltaic applications.

  15. Nutrition chez le brûlé

    Science.gov (United States)

    Perro, G.

    2016-01-01

    Summary La nutrition est un challenge chez le brûlé, paradigme de l’agressé. Les points importants sont les apports entéraux précoces par sonde gastrique voire post pyloriques, la position proclive > 30°, la surveillance du transit et sa régulation par gastro ou entéro-kinétiques, la surveillance du poids, la quantification des apports avec supplémentation parentérale en cas de retard protéino énergétique. Chez l’enfant, l’adhésion à l’alimentation est difficile, de même que chez le senior, où une évaluation nutritionnelle initiale dépiste souvent une dénutrition préexistante. Les compléments alimentaires seront largement prescrits chez les patients de gravité intermédiaire. Les obèses bénéficieront d’un régime hypocalorique et hyperprotidique. Chez l’insuffisant rénal non dialysé il convient de limiter les apports en potassium. En cas brûlure périnéale, on peut proposer soit une constipation de courte durée, soit la mise en place d’un entéro-collecteur, les indications de colostomie étant devenues rares. Les apports entéraux sont difficiles à gérer en cas de décubitus ventral pour SDRA. Chez le brûlé grave de réanimation, l’accent doit plus être mis sur la qualité des nutriments que sur leur quantité. Les anciennes formules d’estimation calorique conduisaient à une surnutrition difficile à administrer et en général mal tolérée; la quantification mesurée par calorimétrie indirecte ou estimée par la formule de Toronto est bien plus adaptée. Plus récemment, l’instauration d’une immunonutrition (supplémentation en vitamines et oligo-éléments, glutamine, arginine, acide Ω 3 et contrôle raisonné de la glycémie) a été proposée pour réduire le stress oxydatif et l’inflammation provoqués par l’accident. PMID:27857647

  16. Correlation of Structure, Tunable Colors, and Lifetimes of (Sr, Ca, BaAl2O4:Eu2+, Dy3+ Phosphors

    Directory of Open Access Journals (Sweden)

    Qidi Xie

    2017-10-01

    Full Text Available (Sr, Ca, BaAl2O4:Eu2+, Dy3+ phosphors were prepared via a high temperature solid-state reaction method. The correlation of phase structure, optical properties and lifetimes of the phosphors are investigated in this work. For the (Sr, CaAl2O4:Eu2+,Dy3+ phosphors, the different phase formation from monoclinic SrAl2O4 phase to hexagonal SrAl2O4 phase to monoclinic CaAl2O4 phase was observed when the Ca content increased. The emission color of SrAl2O4:Eu2+, Dy3+ phosphors varied from green to blue. For the (Sr, BaAl2O4:Eu2+, Dy3+ phosphors, different phase formation from the monoclinic SrAl2O4 phase to the hexagonal BaAl2O4 phase was observed, along with a shift of emission wavelength from 520 nm to 500 nm. More interestingly, the decay time of SrAl2O4:Eu2+, Dy3+changed due to the different phase formations. Lifetime can be dramatically shortened by the substitution of Sr2+ with Ba2+ cations, resulting in improving the performance of the alternating current light emitting diode (AC-LED. Finally, intense LEDs are successfully obtained by combining these phosphors with Ga(InN near UV chips.

  17. Estimering af brændstofforbrug vha. GPS Data

    DEFF Research Database (Denmark)

    Andersen, Ove; Lahrmann, Harry; Torp, Kristian

    2010-01-01

    Det er simpelt og billigt at opsamle GPS målinger fra køretøjer. Når større mængder GPS data indsamles fra et passende antal køretøjer kan dataen bruges til at beregne f.eks. køretider. Det er ligeledes muligt ud fra GPS data at estimere miljøindikatorer så som, hvor aggressivt kører bilister og er...... der nogle vejstrækninger, der har en højere (negativ) miljø påvirkning end andre? I denne artikel præsenterer et forsøg, hvor GPS data anvendes til at estimere brændstofforbruget ved en enkelt tur og for vejnettet generelt. Dette gøres ved at opbygge en database med GPS data. Ud fra disse data gives...

  18. Bovins et humains au Brésil en 2007

    Directory of Open Access Journals (Sweden)

    Hervé Théry

    2008-03-01

    Full Text Available On recherche 35 millions de bovins… Selon les données récemment publiées par l’IBGE (Censo Agropecuário 2006, Resultados preliminares le Brésil comptait en 2006 un peu moins de 170 millions de têtes de bétail, alors que selon la Pesquisa Pecuária Municipal, du même IBGE et à la même date, le pays en comptait alors près de 206 millions.Sans chercher pour le moment la cause de cette différence – de méthodologie, très probablement – et en se rappelant que l’IBGE avertit que ces données provisoi...

  19. Polyvinylpolypyrrolidone Supported Brønsted Acidic Catalyst for Esterification

    Directory of Open Access Journals (Sweden)

    Song Wang

    2016-01-01

    Full Text Available A polyvinylpolypyrrolidone (PVPP supported Brønsted acidic catalyst ([PVPP-BS]HSO4 was prepared by coupling SO3H-functionalized polyvinylpolypyrrolidone with H2SO4 in this work. After the characterization through FT-IR, FESEM, TG, BET, and elemental analysis, it was found that 1,4-butane sultone (BS and sulfuric acid reacted with PVPP and were immobilized on PVPP surface. The prepared [PVPP-BS]HSO4 catalyst shows high catalytic activity for a series of esterification reactions and could be separated from the reacted mixture easily. Moreover, this catalyst could be recycled and reused for six times without significant loss of catalytic performance.

  20. Alocação de linhagens de milho derivadas das populações BR-105 e BR-106 em grupos heteróticos Allocation of maize lines from BR-105 and BR-106 populations to heterotic groups

    Directory of Open Access Journals (Sweden)

    Rogério de Melo Costa Pinto

    2001-09-01

    Full Text Available Os grupos heteróticos são importantes no melhoramento de milho, pois permitem o uso mais eficiente do germoplasma. Assim, o objetivo deste trabalho foi alocar linhagens de milho em grupos heteróticos a partir de estimativas da capacidade específica de combinação. Oito linhagens S3 da população BR-105 e dez da BR-106, foram cruzadas ao nível interpopulacional seguindo um sistema dialélico. Oitenta híbridos simples foram obtidos e avaliados em látices em três ambientes. Foram avaliados os caracteres produção de grãos (PG, altura da planta (AP e altura da espiga (AE. As estimativas das capacidades geral (CGC e específica (CEC de combinação foram obtidas segundo o método 4, modelo I de Griffing. A partir das estimativas de CEC, as linhagens foram alocadas aos respectivos grupos heteróticos utilizando-se o método UPGMA (média aritmética não ponderada para a construção do dendrograma e a dispersão gráfica pelo método das coordenadas principais. Para PG, as linhagens foram alocadas em quatro grupos heteróticos, sendo dois grupos em cada população. Para AP e AE, o uso das estimativas de CEC não foi eficiente para alocar as linhagens em grupos heteróticos. As análises de agrupamento e de coordenadas principais foram eficientes na alocação das linhagens em grupos heteróticos para PG. Então, como a produção de grãos é a principal característica para o melhoramento de milho, com a alocação das linhagens em quatro grupos heteróticos, os cruzamentos serão direcionados e o processo de melhoramento se tornará mais eficiente, evitando a obtenção e a avaliação de cruzamentos (híbridos desnecessários.The heterotic groups are important in maize breeding programs because they allow the most efficient use of the germoplasm. The objective of this research was to allocate maize lines to heterotic groups from estimates of specific combining ability (SCA. Eight and ten S3 lines derived from populations BR-105 and BR

  1. (C5H12NCu2Br3: A Piperidinium Copper(I Bromide with [Cu2Br3]− Ladders

    Directory of Open Access Journals (Sweden)

    Karl W. Krämer

    2012-10-01

    Full Text Available Piperidinium copper(I bromide, (C5H12NCu2Br3, was obtained from a solution of CuBr2, piperidine, and HBr in ethanol. At 60 °C ethanol slowly reduces copper(II to copper(I. Colorless plates of (C5H12NCu2Br3 crystallize in the triclinic space group P-1 with lattice parameters of a = 6.2948(10 Å, b = 8.2624(14 Å, c = 10.7612(17 Å, α = 75.964(19°, β = 89.232(19°, γ = 84.072(19°, and Z = 2 at 173 K. [CuBr4] tetrahedra share edges and form [Cu2Br3]− ladders parallel to the a-axis. (C5H12N+ ions adopt a chair conformation and connect the [Cu2Br3]− ladders via H-bonding. The (C5H12NCu2Br3 structure is related to the mineral rasvumite, KFe2S3, space group Cmcm, which is isostructural to several alkali copper(I halides.

  2. Learning To Use TeX

    Science.gov (United States)

    Hammons, Derek; Close, Hunter

    2012-03-01

    TeX is a useful tool for any scientific professional, but it can also be used by undergraduates to create high quality documents for courses. My presentation will focus on why TeX is a useful program for undergraduates to learn. It can create higher quality lab reports and other documents for courses than other commonly used word processors such as Microsoft Word. TeX can be utilized by anyone through use of a TeX document preparation system such as LaTeX and only a few simple commands. Perhaps best of all, TeX is free to download and use! By taking the time to understand how to use TeX, students will learn a valuable skill that will be continue to be useful throughout their academic and professional careers.

  3. M@TE - Monitoring at TeV energies

    Science.gov (United States)

    Dorner, Daniela; Bretz, Thomas; Gonzalez, Magdalena; Alfaro, Ruben; Tovmassian, Gagik

    2017-01-01

    Blazars are extremely variable objects emitting radiation across the electromagnetic spectrum and showing variability on time scales from minutes to years. For the understanding of the emission mechanisms, simultaneous multi-wavelength observations are crucial. Various models for flares predict simultaneous flux increases in the X-ray and in the gamma-ray band or more complex variability patterns, depending on the dominant process responsible for the gamma-ray emission. Monitoring at TeV energies is providing important information to distinguish between different emission mechanisms. To study the duty cycle and the variability time scales of the object, an unbiased data sample is essential, and a good sensitivity and continuous monitoring are needed to resolve variability on smaller time scales. A dedicated long-term monitoring program at TeV energies has been started by the FACT project more than four years ago. The success of the project clearly illustrated that the usage of silicon based photo sensors (SIPMs) is ideally suited for long-term monitoring. They provide not only an excellent and stable detector performance, but also allow for observations during bright ambient light like full moon minimizing observational gaps and increasing the duty cycle of the instrument. The observation time in a single longitude is limited to six hours. To study typical variability time scales of few hours to one day, the ultimate goal is 24/7 monitoring with a network of small telescopes around the globe (DWARF project). The installation of an Imaging Air Cherenkov Telescope is planned at the site in San Pedro Martir in Mexico. For the M@TE (Monitoring at TeV energies) telescope, a mount from a previous experiment is being refurbished and will be equipped with a camera using the new generation of SiPMs. In the presentation, the status of the M@TE project will be reported and the scientific potential, including the possibility to extend monitoring campaigns to 12 hours by

  4. Low temperature dosimetry in LiF: Mg, Cu, P and CaSO{sub 4}: Dy doped crystals; Dosimetria de baja temperatura en cristales dopados LiF: Mg, Cu, P y CaSO{sub 4}: Dy

    Energy Technology Data Exchange (ETDEWEB)

    Cruz Z, E.; Ramos B, S.; Negron M, A.; Rivera, T. [Instituto de Ciencias Nucleares, UNAM, A.P. 70-543, 04510 Mexico D.F. (Mexico)

    2000-07-01

    It is presented a behavior study of LiF solid dosemeters doped with Mg, Cu and P also polycrystalline samples of CaSO{sub 4} with Dy sinterized in laboratory, both of them were subjected at low temperature. In order to analyse linear behavior to the dose of these dosemeters, it was used thermoluminescence. These materials were exposed to gamma radiation coming from a Co-60 source. The samples were irradiated at dose rates 1.08 {+-} 0.01 Gy/min at liquid nitrogen temperature (LNT) and also the response of dosemeters are compared at ambient temperature and LNT. (Author)

  5. Pan-Balti bränding - müüt või tegelikkus? / Joel Volkov

    Index Scriptorium Estoniae

    Volkov, Joel, 1972-

    2006-01-01

    Brändil pole kodumaad, on keel ja päritolumaa. Lokaalsed brändid valivad suhtlemiseks kohalikega nende kodukeele, globaalsed brändid harilikult inglise keele. Üks suuremaid ja tugevamaid lokaalsest süsteemist kasvanud Pan-Balti brände on Hansapank. Lisa: Sulev Vedler. Hansast võib saada Swedbank

  6. DISCOVERY OF BRIGHT GALACTIC R CORONAE BOREALIS AND DY PERSEI VARIABLES: RARE GEMS MINED FROM ACVS

    Energy Technology Data Exchange (ETDEWEB)

    Miller, A. A.; Richards, J. W.; Bloom, J. S.; Cenko, S. B.; Silverman, J. M.; Starr, D. L. [Department of Astronomy, University of California, Berkeley, CA 94720-3411 (United States); Stassun, K. G., E-mail: amiller@astro.berkeley.edu [Department of Physics and Astronomy, Vanderbilt University, Nashville, TN 37235 (United States)

    2012-08-20

    We present the results of a machine-learning (ML)-based search for new R Coronae Borealis (RCB) stars and DY Persei-like stars (DYPers) in the Galaxy using cataloged light curves from the All-Sky Automated Survey (ASAS) Catalog of Variable Stars (ACVS). RCB stars-a rare class of hydrogen-deficient carbon-rich supergiants-are of great interest owing to the insights they can provide on the late stages of stellar evolution. DYPers are possibly the low-temperature, low-luminosity analogs to the RCB phenomenon, though additional examples are needed to fully establish this connection. While RCB stars and DYPers are traditionally identified by epochs of extreme dimming that occur without regularity, the ML search framework more fully captures the richness and diversity of their photometric behavior. We demonstrate that our ML method can use newly discovered RCB stars to identify additional candidates within the same data set. Our search yields 15 candidates that we consider likely RCB stars/DYPers: new spectroscopic observations confirm that four of these candidates are RCB stars and four are DYPers. Our discovery of four new DYPers increases the number of known Galactic DYPers from two to six; noteworthy is that one of the new DYPers has a measured parallax and is m Almost-Equal-To 7 mag, making it the brightest known DYPer to date. Future observations of these new DYPers should prove instrumental in establishing the RCB connection. We consider these results, derived from a machine-learned probabilistic classification catalog, as an important proof-of-concept for the efficient discovery of rare sources with time-domain surveys.

  7. Magnetocaloric properties of rapidly solidified Dy{sub 3}Co alloy ribbons

    Energy Technology Data Exchange (ETDEWEB)

    Sánchez Llamazares, J. L., E-mail: jose.sanchez@ipicyt.edu.mx; Flores-Zúñiga, H.; Sánchez-Valdés, C. F. [Instituto Potosino de Investigación Científica y Tecnológica A.C., Camino a la Presa San José 2055 Col. Lomas 4" a, San Luis Potosí, S.L.P. 78216 (Mexico); Álvarez-Alonso, Pablo [Departamento de Electricidad y Electrónica, UPV/EHU, 48940 Leioa (Spain); Lara Rodríguez, G. A. [Instituto de Investigaciones en Materiales, Universidad Nacional Autónoma de México, Circuito Exterior s/n, Ciudad Universitaria, México, D. F. 04510 (Mexico); Fernández-Gubieda, M. L. [Departamento de Electricidad y Electrónica, UPV/EHU, 48940 Leioa (Spain); BC Materials, Camino de Ibaizabal, Edificio 500, Planta 1, Parque Científico y Tecnológico de Zamudio, 48160 Derio (Spain)

    2015-05-07

    The magnetic and magnetocaloric (MC) properties of melt-spun ribbons of the Dy{sub 3}Co intermetallic compound were investigated. Samples were fabricated in an Ar environment using a homemade melt spinner system at a linear speed of the rotating copper wheel of 40 ms{sup −1}. X-ray diffraction analysis shows that ribbons crystallize into a single-phase with the Fe{sub 3}C-type orthorhombic crystal structure. The M(T) curve measured at 5 mT reveals the occurrence of a transition at 32 K from a first to a second antiferromagnetic (AFM) state and an AFM-to-paramagnetic transition at T{sub N} = 43 K. Furthermore, a metamagnetic transition is observed below T{sub N}, but the magnetization change ΔM is well below the one reported for bulk alloys. Below 12 K, large inverse MC effect and hysteresis losses are observed. This behavior is related to the metamagnetic transition. For a magnetic field change of 5 T (2 T) applied along the ribbon length, the produced ribbons show a peak value of the magnetic entropy change ΔS{sub M}{sup peak} of −6.5 (− 2.1) Jkg{sup −1}K{sup −1} occurring close to T{sub N} with a full-width at half-maximum δT{sub FWHM} of 53 (37) K, and refrigerant capacity RC = 364 (83) Jkg{sup −1} (estimated from the product |ΔS{sub M}{sup peak}| × δT{sub FWHM})

  8. Project DyAdd: classical eyeblink conditioning in adults with dyslexia and ADHD.

    Science.gov (United States)

    Laasonen, Marja; Kauppinen, Jenni; Leppämäki, Sami; Tani, Pekka; Harno, Hanna; Hokkanen, Laura; Wikgren, Jan

    2012-11-01

    In this study of the project DyAdd (Adult Dyslexia and Attention Deficit Disorder in Finland), classical eyeblink conditioning (EBC) was investigated in both delay and trace paradigms in adults (18-55 years) with dyslexia (n = 37), attention deficit-hyperactivity disorder (ADHD; n = 21), their comorbid combination (n = 8), and healthy controls (n = 35). In addition, the profiles of three participants with a rare autosomal dominant cerebellar disease were assessed (episodic ataxia type 2, EA-2). We found that participants with dyslexia were overall slower learners than controls in eyeblink conditioning. Further, they were the only group that had a reduced number of CRs in mediotemporal-dependent trace paradigm compared to the more cerebellum-dependent delay paradigm. Second, ADHD was found to be related to larger CR amplitude. Third, those with a comorbid condition learned faster and manifested CRs that were not well timed. Fourth, the cerebellar patients showed nearly no conditioning at all. Correlations between EBC and various neuropsychological domains (phonological processing, reading, spelling, arithmetic, executive functions, attention, and fine motor control) over all participants resulted in significant relations only for the delay paradigm: Increased amount of reading errors related with later peak latency and increased amount of self-corrections in fine motor control related with larger response magnitude. Within those who conditioned, relations emerged only for the trace paradigm: better spelling was related to larger response magnitude. These results do not lend support to the cerebellar hypothesis of dyslexia. On the contrary, dyslexia in its pure form seems to be related to a relative dysfunction of a larger hippocampal-cerebellar network. Further, larger responses in the ADHD group are suggested to result from their lowered responding threshold.

  9. Thermochemical properties of silver tellurides including empressite (AgTe) and phase diagrams for Ag-Te and Ag-Te-O

    Science.gov (United States)

    Voronin, Mikhail V.; Osadchii, Evgeniy G.; Brichkina, Ekaterina A.

    2017-10-01

    This study compiles original experimental and literature data on the thermodynamic properties (ΔfG°, S°, ΔfH°) of silver tellurides (α-Ag2Te, β-Ag2Te, Ag1.9Te, Ag5Te3, AgTe) obtained by the method of solid-state galvanic cell with the RbAg4I5 and AgI solid electrolytes. The thermodynamic data for empressite (AgTe, pure fraction from Empress Josephine Mine, Colorado USA) have been obtained for the first time by the electrochemical experiment with the virtual reaction Ag + Te = AgTe. The Ag-Te phase diagrams in the T - x and log fTe2 (gas) - 1/ T coordinates have been refined, and the ternary Ag-Te-O diagrams with Ag-Te-TeO2 (paratellurite) composition range have been calculated.

  10. CsPb2Br5 Single Crystals: Synthesis and Characterization

    KAUST Repository

    Dursun, Ibrahim

    2017-08-02

    CsPb2Br5 is a ternary halogen-plumbate material with close characteristics to well-reported halide perovskites. Due to its unconventional two-dimensional structure, CsPb2Br5 is being looked at broadly for potential applications in optoelectronics. CsPb2Br5 investigations are currently limited to nanostructures and powder forms of the material, which present unclear and conflicting optical properties. In this study, we present the synthesis and characterization of CsPb2Br5 bulk single crystals, which enabled us to finally clarify the material\\'s optical features. Our CsPb2Br5 crystal has a two-dimensional structure with Pb2Br5- layers spaced by Cs+ cations, and exhibits a ~3.1 eV indirect bandgap with no emission in the visible spectrum.

  11. Inhibition of hydrogen oxidation by HBr and Br2

    DEFF Research Database (Denmark)

    Dixon-Lewis, Graham; Marshall, Paul; Ruscic, Branko

    2012-01-01

    O. Ab initio calculations were used to obtain rate coefficients for selected reactions of HBr and HOBr, and the hydrogen/bromine/oxygen reaction mechanism was updated. The resulting model was validated against selected experimental data from the literature and used to analyze the effect of HBr and Br2......The high-temperature bromine chemistry was updated and the inhibition mechanisms involving HBr and Br2 were re-examined. The thermochemistry of the bromine species was obtained using the Active Thermochemical Tables (ATcT) approach, resulting in improved data for, among others, Br, HBr, HOBr and Br...... on laminar, premixed hydrogen flames. Our work shows that hydrogen bromide and molecular bromine act differently as inhibitors in flames. For HBr, the reaction HBr+H⇌H2+Br (R2) is rapidly equilibrated, depleting HBr in favor of atomic Br, which is the major bromine species throughout the reaction zone...

  12. The superacid HBr/AlBr(3) : protonation of benzene and ordered crystal structure of [C(6)H(7)](+)[Al(2)Br(7)](-).

    Science.gov (United States)

    Scholz, Franziska; Himmel, Daniel; Eisele, Lea; Unkrig, Wiebke; Krossing, Ingo

    2014-02-03

    Crystalline and properly ordered protonated benzene as the [C6 H7 ](+) [Al2 Br7 ](-) ⋅(C6 H6 ) salt 1 are obtained by the combination of solid AlBr3 , benzene, and HBr gas. Compound 1 was characterized and verified by NMR, Raman and X-Ray spectroscopy. This unexpected simple and straight forward access shows that HBr/AlBr3 is an underestimated superacid that should be used more frequently. Copyright © 2014 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

  13. Critères de gravité des brûlures: à propos de 337 cas de brûlés au ...

    African Journals Online (AJOL)

    L'objectif était d'étudier les critères de gravité des brûlures chez des patients brûlés hospitalisés à l'hôpital militaire d'instruction Mohamed V de Rabat. Il s'agit d'une étude rétrospective qui concernait 337 patients hospitalisés de 2004 à 2010. Les variables étudiés sont: l'âge, la surface corporelle brûlée, la profondeur, ...

  14. Solvent dependent branching between C-I and C-Br bond cleavage following 266 nm excitation of CH2BrI

    Science.gov (United States)

    Anderson, Christopher P.; Spears, Kenneth G.; Wilson, Kaitlynn R.; Sension, Roseanne J.

    2013-11-01

    It is well known that ultraviolet photoexcitation of halomethanes results in halogen-carbon bond cleavage. Each halogen-carbon bond has a dominant ultraviolet (UV) absorption that promotes an electron from a nonbonding halogen orbital (nX) to a carbon-halogen antibonding orbital (σ*C-X). UV absorption into specific transitions in the gas phase results primarily in selective cleavage of the corresponding carbon-halogen bond. In the present work, broadband ultrafast UV-visible transient absorption studies of CH2BrI reveal a more complex photochemistry in solution. Transient absorption spectra are reported spanning the range from 275 nm to 750 nm and 300 fs to 3 ns following excitation of CH2BrI at 266 nm in acetonitrile, 2-butanol, and cyclohexane. Channels involving formation of CH2Br + I radical pairs, iso-CH2Br-I, and iso-CH2I-Br are identified. The solvent environment has a significant influence on the branching ratios, and on the formation and stability of iso-CH2Br-I. Both iso-CH2Br-I and iso-CH2I-Br are observed in cyclohexane with a ratio of ˜2.8:1. In acetonitrile this ratio is 7:1 or larger. The observation of formation of iso-CH2I-Br photoproduct as well as iso-CH2Br-I following 266 nm excitation is a novel result that suggests complexity in the dissociation mechanism. We also report a solvent and concentration dependent lifetime of iso-CH2Br-I. At low concentrations the lifetime is >4 ns in acetonitrile, 1.9 ns in 2-butanol and ˜1.4 ns in cyclohexane. These lifetimes decrease with higher initial concentrations of CH2BrI. The concentration dependence highlights the role that intermolecular interactions can play in the quenching of unstable isomers of dihalomethanes.

  15. TE Wave Measurement and Modeling

    CERN Document Server

    Sikora, John P; Sonnad, Kiran G; Alesini, David; De Santis, Stefano

    2013-01-01

    In the TE wave method, microwaves are coupled into the beam-pipe and the effect of the electron cloud on these microwaves is measured. An electron cloud (EC) density can then be calculated from this measurement. There are two analysis methods currently in use. The first treats the microwaves as being transmitted from one point to another in the accelerator. The second more recent method, treats the beam-pipe as a resonant cavity. This paper will summarize the reasons for adopting the resonant TE wave analysis as well as give examples from CESRTA and DA{\\Phi}NE of resonant beam-pipe. The results of bead-pull bench measurements will show some possible standing wave patterns, including a cutoff mode (evanescent) where the field decreases exponentially with distance from the drive point. We will outline other recent developments in the TE wave method including VORPAL simulations of microwave resonances, as well as the simulation of transmission in the presence of both an electron cloud and magnetic fields.

  16. Recoil and conversion electron considerations of the {sup 166}Dy/{sup 166}Ho in vivo generator

    Energy Technology Data Exchange (ETDEWEB)

    Zeevaart, J.R. [North-West Univ., Mmabatho (South Africa). CARST; Szuecs, Z. [Nesca (South African Nuclear Energy Corporation Ltd.), Pretoria (South Africa). Radiochemistry; Hungarian Academy of Sciences, Debrecen (Hungary). Inst. of Nuclear Research; Takacs, S.; Jarvis, N. [Hungarian Academy of Sciences, Debrecen (Hungary). Inst. of Nuclear Research; Jansen, D. [Nesca (South African Nuclear Energy Corporation Ltd.), Pretoria (South Africa). Radiochemistry

    2012-07-01

    The use of radionuclides as potential therapeutic radiopharmaceuticals is increasingly investigated. An important aspect is the delivery of the radionuclide to the target, i.e. the radionuclide is not lost from the chelating agent. For in vivo generators, it is not only the log K of complexation between the metal ion and the chelator that is important, but also whether the daughter radionuclide stays inside the chelator after decay of the parent radionuclide. In our previous work, we showed that the classical recoil effect is only applicable for decays with a Q value higher than 0.6 MeV (in the atomic mass range around 100). However, Zhernosekov et al. published a result for {sup 140}Nd/{sup 140}Pr (Q = 0.222 MeV) which indicated that > 95% of the daughter ({sup 140}Pr) was lost by a DOTA chelator upon decay of {sup 140}Nd. The authors ascribed this to the ''post-effect''. Their experiment was repeated with the {sup 166}Dy/{sup 166}Ho generator to ascertain whether our calculations were correct. It was found that 72% of the daughter ({sup 166}Ho) was liberated from the DOTA chelator, indicating that the 'post effect' does exist in contrast to our recoil calculations. Upon further investigation, we determined that one should not only consider recoil energy levels but also the mode of decay which was able to explain the partial recoil found for {sup 166}Dy/{sup 166}Ho. It is concluded for the {sup 166}Dy/{sup 166}Ho system that the low recoil energy of the daughter nucleus {sup 166}Ho is not a sufficient reason to rule out release of the nuclide from chelators. On the other hand, we found that the ratio of the {sup 166}Ho that gets released corresponds to the ratio of relaxation of Ho atoms via the Auger process. (orig.)

  17. Thermal, optical and dielectric properties of phase stabilized δ - Dy-Bi2O3 ionic conductors

    Science.gov (United States)

    Bandyopadhyay, Swagata; Dutta, Abhigyan

    2017-03-01

    In this work, we have investigated the thermal, structural, optical and dielectric properties of Bi1-xDyxO1.5-δ (0.10≤x≤0.40) ionic conductors prepared by citrate auto-ignition method. The Thermo gravimetric-DTA analysis and X-Ray Diffraction pattern confirm the single δ-phase stabilization of doped system beyond 25 mol% doping concentration. XRD analysis also indicates that average crystallite size is maximum and micro strain is minimum for Bi0.75Dy0.25O1.5-δ composition. The optical band gap of the prepared compositions is obtained from the Ultraviolet- Visible spectroscopy that shows a red shift with the increase in Dy content. The presence of different structural bonds is confirmed from FT-IR spectroscopy analysis. Ionic transport property of the prepared compositions has been analyzed using Nyquist plot for dc conduction and Nernst-Einstein relation for ac conduction mechanism. This analysis indicates that the composition Bi0.75Dy0.25O1.5-δ shows highest conductivity. The dielectric properties of these ionic conductors have been analyzed using Havriliak-Negami (HN) formalism. The dielectric permittivity ε' (ω) of all the prepared compositions is found to be within the range 1.61-3.63(x102) in S.I. unit. Analysis of electric modulus data reveals that dielectric and modulus relaxation follows same mechanism. The time-temperature superposition principle has been verified from the scaling of modulus spectra.

  18. Effect of spin fluctuations in magnetocaloric and magnetoresistance properties of Dy10Co20Si70 alloy

    Science.gov (United States)

    Rashid, T. P.; Arun, K.; Curlik, Ivan; Ilkovic, Sergej; Reiffers, Marian; Dzubinska, Andrea; Nagalakshmi, R.

    2017-09-01

    Systematic investigations on the structure, magnetic, thermodynamic, magnetocaloric and magnetoresistance (MR) properties of the arc melted Dy10Co20Si70 alloy are presented. The Dy10Co20Si70 alloy crystallizes in tetragonal BaNiSn3-type DyCoSi3 (space group = I4mm; No. 107) as a major phase and CaF2-type CoSi2 (space group = Fm-3m; No. 225) and C-type Si (space group = Fd-3m; No. 227) as minor phases. The title compound exhibits multiple magnetic transitions having antiferromagnetic ordering at temperatures, viz., T1 = 10.8 K, T2 = 8.8 K and T3 = 3.3 K. The magnetic and thermodynamic studies confirm these magnetic anomalies in the compound. The large value of maximum magnetic entropy change, -ΔSMM a x = 16.4 and 26.6 J/kg K for the field change ΔH of 50 and 90 kOe, respectively, observed in the compound is associated with field induced magnetic transitions. Asymmetric broadening of the magnetic entropy change peaks above the ordering temperatures resulting in significant refrigerant capacities of 361 and 868 J/kg for ΔH = 50 and 90 kOe, respectively, in the compound is due to the spin fluctuation effect. The sign reversal in MR measurements is attributed to the field induced antiferromagnetic to ferromagnetic transition. A large positive MR (42% in 90 kOe) is observed at 2 K. The H2 dependence of both the magnetocaloric effect (MCE) and MR in the paramagnetic regime indicates the role of the applied magnetic field in suppressing the spin fluctuations. The large MCE and MR together with no thermal or magnetic hysteresis establish this new compound as an attractive multifunctional magnetic material.

  19. Magnetic and structural properties of nano sized Dy-doped cobalt ferrite synthesized by co-precipitation

    Energy Technology Data Exchange (ETDEWEB)

    Karimi, Z., E-mail: Zahra_kr64@yahoo.com [Department of Materials Engineering, Institute of Mechanical Engineering, University of Tabriz, Tabriz 51666-16471 (Iran, Islamic Republic of); Mohammadifar, Y.; Shokrollahi, H. [Electroceramics Group, Department of Materials Science and Engineering, Shiraz University of Technology, Shiraz (Iran, Islamic Republic of); Asl, Sh. Khameneh [Department of Materials Engineering, Institute of Mechanical Engineering, University of Tabriz, Tabriz 51666-16471 (Iran, Islamic Republic of); Yousefi, Gh. [Center for Pharmaceutical Nanotechnology and Biomaterials, Pharmaceutical Sciences Research Center, School of Pharmacy, Shiraz University of Medical Sciences, Shiraz (Iran, Islamic Republic of); Department of Pharmaceutics, School of Pharmacy, Shiraz University of Medical Sciences, Shiraz (Iran, Islamic Republic of); Karimi, L. [Materials Science and Engineering Department, Islamic Azad University Ahvaz Branch, Ahvaz (Iran, Islamic Republic of)

    2014-06-01

    Regarding the various applications of cobalt ferrite as a magnetic ceramic in various scientific and industrial categories, it is essential to modify and optimize its microstructural and magnetic features. Chemical composition (doped elements and their quantities) is a determining factor which has been studied in this research. For this purpose, cobalt-dysprosium ferrite ceramic nanoparticles with the chemical formula Co{sub 1−x}Dy{sub x}Fe{sub 2}O{sub 4} (x=0, 0.01, 0.03, 0.05, 0.1) were synthesized by the co-precipitation chemical method and then analyzed from the structural and magnetic perspectives. The desirable spinel phase formation was confirmed via x-ray diffractometry, and the other crystallographic parameters and cation distribution were calculated. The microscopic image of the samples showed 15 nm particles. The type and strength of the interionic bonds were determined by infrared spectroscopy. The hysteresis loop of the material was affected noticeably by doped elements as the room temperature saturation magnetization was decreased, but the residual magnetization and coercivity of ferrite were promoted by 50 and 150% after adding dysprosium, respectively. The maximum anisotropy constant, which is equal to 19.1 erg/g for undoped cobalt ferrite, was increased to 45.2 erg/g by doping 0.05 dysprosium. It is worth mentioning that introducing dopants into the lattice led to a great decrease in Curie temperature. - Highlights: • Magnetic and structural studies of Dy{sup 3+}–Co–ferrite are investigated. • Simple co-precipitation method involving less energy and low-cost is used. • The nanoparticles with high coercivity, magnetization and loop area are obtained. • The composition Co{sub 0.95}Dy{sub 0.05}Fe{sub 2}O{sub 4} has the maximum coercivity and high residual magnetization.

  20. Exchange coupling in TbCu and DyCu single-molecule magnets and related lanthanide and vanadium analogs.

    Science.gov (United States)

    Ishida, Takayuki; Watanabe, Ryo; Fujiwara, Kei; Okazawa, Atsushi; Kojima, Norimichi; Tanaka, Go; Yoshii, Shunsuke; Nojiri, Hiroyuki

    2012-11-28

    Heterometallic coordination compounds [Cu(II)(L)(C(3)H(6)O)Ln(III)(NO(3))(3)] and [V(IV)O(L)(C(3)H(6)O)Ln(III)(NO(3))(3)] (abbreviated as LnCu and LnV, respectively; H(2)L = N,N'-bis(3-methoxysalicylidene)-1,3-diamino-2,2-dimethylpropane; Ln = Gd, Tb, Dy, Ho, and Er) were synthesized, and the X-ray crystallographic analysis shows that their structures are isomorphous for each series. The single-molecule magnet behavior was observed for TbCu and DyCu, and the activation energies of magnetization reversal were 42.3(4) and 11.5(10) K, respectively. The magnetic exchange couplings in LnCu and LnV were precisely evaluated by means of combined high-frequency EPR and pulsed-field magnetization studies, to give J(Tb-Cu)/k(B)≥ 3.3 K, J(Dy-Cu)/k(B) = 1.63(1) K, J(Ho-Cu)/k(B) = 1.09(2) K, and J(Er-Cu)/k(B) = 0.24(1) K. A monotonic decrease of ferromagnetic J(Ln-Cu) was found in the order of the atomic number, (64)Gd to (68)Er. The corresponding exchange parameters in LnV are smaller than those of the Cu derivatives, and J(Gd-V) was antiferromagnetic (-3.0 K determined from the magnetization jump). A possible mechanism for the exchange coupling and chemical trend is discussed.

  1. Strong broad green UV-excited photoluminescence in rare earth (RE = Ce, Eu, Dy, Er, Yb) doped barium zirconate

    Energy Technology Data Exchange (ETDEWEB)

    Borja-Urby, R. [Grupo de Espectroscopia de Materiales Avanzados y Nanoestructurados (EMANA), Centro de Investigaciones en Optica A. C., Leon, Gto. 37150 (Mexico); Diaz-Torres, L.A., E-mail: ditlacio@cio.mx [Grupo de Espectroscopia de Materiales Avanzados y Nanoestructurados (EMANA), Centro de Investigaciones en Optica A. C., Leon, Gto. 37150 (Mexico); Salas, P. [Centro de Fisica Aplicada y Tecnologia Avanzada, Universidad Nacional Autonoma de Mexico, A.P. 1-1010, Queretaro, Qro. 76000 (Mexico); Angeles-Chavez, C. [Instituto Mexicano del Petroleo, Ciudad de Mexico, D. F. 07730 (Mexico); Meza, O. [Grupo de Espectroscopia de Materiales Avanzados y Nanoestructurados (EMANA), Centro de Investigaciones en Optica A. C., Leon, Gto. 37150 (Mexico)

    2011-10-25

    Highlights: > Trivalent rare earth (RE) substitution on Zr{sup 4+} sites in BaZrO{sub 3} lead to band gap narrowing. > RE substitution lead to enhanced blue-green intrinsic emission of nanocrystalline BaZrO{sub 3} > Blue-green hue of BaZrO3:RE depends on RE dopant and excitation UV wavelength > BaZrO3: Dy{sup 3+} PL chromatic coordinates correspond to pure white color coordinates of CIE 1931 model - Abstract: The wet synthesis hydrothermal method at 100 deg. C was used to elaborate barium zirconate (BaZrO{sub 3}) unpurified with 0.5 mol% of different rare earth ions (RE = Yb, Er, Dy, Eu, Ce). Morphological, structural and UV-photoluminescence properties depend on the substituted rare earth ionic radii. While the crystalline structure of RE doped BaZrO{sub 3} remains as a cubic perovskite for all substituted RE ions, its band gap changes between 4.65 and 4.93 eV. Under 267 nm excitation the intrinsic green photoluminescence of the as synthesized BaZrO{sub 3}: RE samples is considerably improved by the substitution on RE ions. For 1000 deg. C annealed samples, under 267 nm, the photoluminescence is dominated by the intrinsic BZO emission. It is interesting to notice that Dy{sup 3+}, Er{sup 3+} and Yb{sup 3+} doped samples present whitish emissions that might be useful for white light generation under 267 nm excitation. CIE color coordinates are reported for all samples.

  2. On forge des partenariats au Brésil | CRDI - Centre de recherches ...

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

    9 mai 2011 ... La collaboration entre les différents établissements brésiliens reconnus dans leur champ d'expertise donne du poids aux arguments quand il s'agit de s'adresser aux décideurs, conclut Mme Padua. Instituto de Pesquisas Ecologicas, Brésil Fundação Oswaldo Cruz (FIOCRUZ), Brésil Faculté de médecine ...

  3. Photochromic conversions of the Br/sub 2//sup -/ radical ion

    Energy Technology Data Exchange (ETDEWEB)

    Plyusnin, V.F.

    The photolysis of frozen solutions of HBr, containing complexes of FeBr/sub 3/ or CuBr/sub 4//sup 2 -/, is discussed. The primary product of the photoreduction of complexes is the radical ion Br/sub 2//sup -/. Irradiation in the absorption band of this particle leads to its disappearance. However, it can be regulated by photolysis of the sample in a shorter-wave region of the spectrum. The processes leading to this photochrome conversion are discussed.

  4. Babcock and Wilcox BR-100 100-ton rail/barge spent fuel shipping cask

    Energy Technology Data Exchange (ETDEWEB)

    None

    1990-02-01

    This Preliminary Design Report (PDR) provides a detailed description of the design, analyses, and testing programs for the BR-100 cask. The BR-100 is a Type B(U) cask designed for transport by rail or barge. This report presents the preliminary analyses and tests which have been performed for the BR-100 and outlines the confirmatory analyses and tests which will be performed.

  5. A square-planar tellurium(II) complex with Te,Te'-chelating ligands.

    Science.gov (United States)

    Chivers, Tristram; Ritch, Jamie S

    2015-05-01

    While exploring the chemistry of tellurium-containing dichalcogenidoimidodiphosphinate ligands, the first all-tellurium member of a series of related square-planar E(II)(E')4 complexes (E and E' are group 16 elements), namely bis(P,P,P',P'-tetraphenylditelluridoimidodiphosphinato-κ(2)Te,Te')tellurium(II) (systematic name: 2,2,4,4,8,8,10,10-octaphenyl-1λ(3),5,6λ(4),7λ(3),11-pentatellura-3,9-diaza-2λ(5),4λ(5),8λ(5),10λ(5)-tetraphosphaspiro[5.5]undeca-1,3,7,9-tetraene), C48H40N2P4Te5, was obtained unexpectedly. The formally Te(II) centre is situated on a crystallographic inversion centre and is Te,Te'-chelated to two anionic [(TePPh2)2N](-) ligands in an anti conformation. The central Te(II)(Te)4 unit is approximately square planar [Te-Te-Te = 93.51 (3) and 86.49 (3)°], with Te-Te bond lengths of 2.9806 (6) and 2.9978 (9) Å.

  6. Tissue distribution of the dystrophin-related gene product and expression in the mdx and dy mouse.

    OpenAIRE

    Love, D.R.; Morris, G.E.; Ellis, J M; Fairbrother, U; Marsden, R F; Bloomfield, J F; Edwards, Y H; Slater, C. P.; Parry, D.J; Davies, K E

    1991-01-01

    We have previously reported a dystrophin-related locus (DMDL for Duchenne muscular dystrophy-like) on human chromosome 6 that maps close to the dy mutation on mouse chromosome 10. Here we show that this gene is expressed in a wide range of tissues at varying levels. The transcript is particularly abundant in several human fetal tissues, including heart, placenta, and intestine. Studies with antisera raised against a DMDL fusion protein identify a 400,000 Mr protein in all mouse tissues tested...

  7. Effect of Annealing, Stoichiometry, and Surface on Magnetism of (Pr,DyFeCoB Microparticles Ensemble

    Directory of Open Access Journals (Sweden)

    Kablov E.N.

    2017-09-01

    Full Text Available Magnetic properties of powder (Pr,DyFeCoB ferrimagnetic alloys and effects of annealing, surface states were analyzed. X-ray photoelectron spectroscopy and Mössbauer spectra of powders indicate the effect of surface states on phase composition and magnetic properties of the studied powder, if particles average size is smaller than 10 μm. Effect of stoichiometry on magnetic anisotropy was found. Thermal stability of anisotropy field was proved by replacement of Fe atoms with Co atoms.

  8. Anisotropy in the paramagnetic phase of RAl/sub 2/ cubic intermetallic compounds (R = Tb, Dy, and Er)

    Energy Technology Data Exchange (ETDEWEB)

    del Moral, A.; Ibarra, M.R.; Abell, J.S.; Montenegro, J.F.D.

    1987-05-01

    In this paper it is shown that the anisotropy in the paramagnetic phase is a useful characteristic when used to single out high-rank susceptibility tensor components in the paramagnetic regime of cubic crystals. Application of this technique to RAl/sub 2/ compounds (R = Tb,Dy,Er) allows the determination of longitudinal and transverse (in the form of linear combinations) fourth- and sixth-rank paramagnetic susceptibilities. The use of the fourth-rank longitudinal susceptibility allows quadrupolar pair interactions in these compounds to be probed.

  9. Nuclear structure effects of the nuclei {sup 152,154,156}Dy at high excitation energy and large angular momentum

    Energy Technology Data Exchange (ETDEWEB)

    Martin, V. [Analisis Numerico, Facultad de Informatica, Universidad Politecnica de Madrid, E-28660 Madrid (Spain); Egido, J.L. [Departamento de Fisica Teorica C-XI, Universidad Autonoma de Madrid, E-28049 Madrid (Spain)

    1995-06-01

    Using the finite-temperature Hartree-Fock-Bogoliubov formalism we analyze the properties of the nuclei {sup 152,154,156}Dy at the quasicontinuum region from {ital I}=0{h_bar} to 70{h_bar} and excitation energy up to approximately 16 MeV. We discuss energy gaps, shapes, moments of inertia, and entropy among others. The role of shape fluctuations is studied in the frame of classical statistics and we find large effects on several observables. A very rich structure is found in terms of excitation energy and angular momentum.

  10. A 27/2$^{-}$ three-particle isomer on the doubly closed shell nucleus $^{146}$Gd identified in $^{149}$Dy

    CERN Document Server

    Kleinheinz, P; Maier, M R; Stefanini, A M

    1976-01-01

    The authors have produced the nucleus /sub 66//sup 149/Dy/sub 83/ through the /sup 152/Gd( alpha ,7n) reaction at 106 MeV and have investigated its previously unknown level structure in an in-beam gamma -ray experiment. The results establish a very low-lying 27/2/sup -/ isomer, and such an isomer is expected to occur as the lowest lying three-particle configuration on the doubly closed shell nucleus /sub 64//sup 146/Gd/sub 82/.

  11. Thermoluminescence of nanocrystalline CaSO{sub 4}: Dy for gamma dosimetry and calculation of trapping parameters using deconvolution method

    Energy Technology Data Exchange (ETDEWEB)

    Mandlik, Nandkumar, E-mail: ntmandlik@gmail.com [Department of Physics, University of Pune, Ganeshkhind, Pune -411007, India and Department of Physics, Fergusson College, Pune- 411004 (India); Patil, B. J.; Bhoraskar, V. N.; Dhole, S. D. [Department of Physics, University of Pune, Ganeshkhind, Pune -411007 (India); Sahare, P. D. [Department of Physics and Astrophysics, University of Delhi, Delhi- 110007 (India)

    2014-04-24

    Nanorods of CaSO{sub 4}: Dy having diameter 20 nm and length 200 nm have been synthesized by the chemical coprecipitation method. These samples were irradiated with gamma radiation for the dose varying from 0.1 Gy to 50 kGy and their TL characteristics have been studied. TL dose response shows a linear behavior up to 5 kGy and further saturates with increase in the dose. A Computerized Glow Curve Deconvolution (CGCD) program was used for the analysis of TL glow curves. Trapping parameters for various peaks have been calculated by using CGCD program.

  12. Lanthanide-organic coordination frameworks showing new 5-connected network topology and 3D ordered array of single-molecular magnet behavior in the Dy case.

    Science.gov (United States)

    Chen, Min; Sañudo, E Carolina; Jiménez, Erika; Fang, Shao-Ming; Liu, Chun-Sen; Du, Miao

    2014-07-07

    Five isostructural lanthanide-organic coordination frameworks with a unique 3-D 5-connected (4(7).6(3))(4(3).6(5).8(2)) network, namely, [Ln(phen)(L)]n (Ln = Dy for 1, Gd for 2, Ho for 3, Er for 4, and Tb for 5), have been prepared based on bridging 5-hydroxyisophthalic acid (H3L) and chelating 1,10-phenanthroline (phen) coligand. Significantly, the Dy(III) complex 1 is an organized array of single-molecular magnets (SMMs), with frequency-dependent out-of-phase ac susceptibility signals and magnetization hysteresis at 4 K. Further analysis of the magnetic results can reveal that the SMM behavior of 1 should arise from the smaller ferromagnetic interaction between the Dy(III) ions. Complex 1 was also characterized by X-ray absorption spectra, which give the clear X-ray magnetic circular dichroism signal.

  13. Spectroscopy of Neutron-Rich $^{168,170}$Dy: Yrast Band Evolution Close to the $N_{p}N_{n}$ Valence Maximum

    CERN Document Server

    Söderström, P A; Regan, P H; Algora, A; de Angelis, G; Ashley, S F; Aydin, S; Bazzacco, D; Casperson, R J; Catford, W N; Cederkäll, J; Chapman, R; Corradi, L; Fahlander, C; Farnea, E; Fioretto, E; Freeman, S J; Gadea, A; Gelletly, W; Gottardo, A; Grodner, E; He, C Y; Jones, G A; Keyes, K; Labiche, M; Liang, X; Liu, Z; Lunardi, S; Muarginean, N; Mason, P; Menegazzo, R; Mengoni, D; Montagnoli, G; Napoli, D; Ollier, J; Pietri, S; Podolyák, Z; Pollarolo, G; Recchia, F; Şahin, E; Scarlassara, F; Silvestri, R; Smith, J F; Spohr, K M; Steer, S J; Stefanini, A M; Szilner, S; Thompson, N J; Tveten, G M; Ur, C A; Valiente-Dobón, J J; Werner, V; Williams, S J; Xu, F R; Zhu, J Y

    2010-01-01

    The yrast sequence of the neutron-rich dysprosium isotope Dy-168 has been studied using multi-nucleon transfer reactions following the collision of a 460-MeV Se-82 beam and a Er-170 target. The reaction products were identified using the PRISMA magnetic spectrometer and the gamma rays detected using the CLARA HPGe-detector array. The 2+ and 4+ members of the previously measured ground state rotational band of Dy-168 was confirmed and the yrast band extended up to 10+. A tentative candidate for the 4+ to 2+ transition in Dy-170 was also identified. The data on this and lighter even-even dysprosium isotopes are interpreted in terms of Total Routhian Surface calculations and the evolution of collectivity approaching the proton-neutron valence product maximum is discussed.

  14. Size-Dependent Optical Properties of Nanoscale and Bulk Long Persistent Phosphor SrAl2O4:Eu2+, Dy3+

    Directory of Open Access Journals (Sweden)

    Xiaoxia Duan

    2015-01-01

    Full Text Available Nanoscale long persistent phosphor SrAl2O4:Eu2+, Dy3+ was prepared by autocombustion of citrate gel. The energy level shift of activator Eu2+ and coactivator Dy3+ was analyzed according to the emission and the excitation spectra. The band gap change of SrAl2O4 and the resulting trap depth change with particle size were discussed on the basis of analyzing the visible spectra, the vacuum ultraviolet (VUV excitation spectra, and the thermoluminescence (TL spectra. The fluorescence quenching and the shallow traps originating from surface adsorption or surface defects explain the weak initial persistent phosphorescence and the fast phosphorescence decay in nanometer SrAl2O4:Eu2+, Dy3+. It is confirmed that energy level, band gap, trap depth, defect, and surface adsorption are deeply related with each other in this nanoscale long persistent phosphor.

  15. Crystal structure and Mössbauer studies of the isotypic Fe6-cluster compounds RE15[Fe8C25], RE=Dy, Ho

    KAUST Repository

    Davaasuren, Bambar

    2015-05-01

    The carboferrates RE15[Fe8C25] (RE=Dy, Ho) were prepared from mixtures of the elements by arc-melting followed with subsequent annealing at 1373 K. The crystal structures were determined from single crystal X-ray diffraction data and revealed an isotypic relationship to Er15[Fe8C25] (hP48, P321). The main feature of the crystal structure is given by Fe6 cluster units characterized by covalent Fe-Fe bonding interactions. 57Fe Mössbauer spectra of Dy15[Fe8C25] were fitted by three subspectra with relative spectral weights of about 3:3:2 which is in general agreement with the crystal structure. Below 50 K, an onset of magnetic hyperfine fields at the three iron sites is observed which is supposed to be caused by dipolar fields arising from neighboring, slowly relaxing Dy magnetic moments.

  16. Dopant occupancy and UV-VIS-NIR spectroscopy of Mg (0, 4, 5 and 6 mol.%):Dy:LiNbO3 crystal

    Science.gov (United States)

    Dai, Li; Liu, Chunrui; Han, Xianbo; Wang, Luping; Tan, Chao; Yan, Zhehua; Xu, Yuheng

    2017-09-01

    A series of Dy:LiNbO3 crystals with x mol.% Mg2+ ions (x =0, 4, 5 and 6 mol.%) were grown by the Czochralski method. The effective segregation coefficient of Mg2+ and Dy3+ ions was studied by the inductively coupled plasma-atomic emission spectrometry (ICP-AES). UV-VIS-NIR absorption spectra and Judd-Ofelt theory were used to investigate their spectroscopic properties. J-O intensity parameters (Ω2 = 7.53 × 10-20cm2, Ω4 = 6.98 × 10-20cm2, and Ω6 = 3.09 × 10-20cm2) and larger spectroscopic quality factor (X = 2.26) for Mg:(6 mol.%)Dy:LiNbO3 crystals were obtained.

  17. Link between Enhanced Arctic tropospheric BrO observed by Aura OMI and meteorological conditions

    Science.gov (United States)

    Choi, S.; Joiner, J.; Theys, N.; Salawitch, R. J.; Wales, P.; Canty, T. P.; Chance, K.; Suleiman, R. M.; Palm, S. P.; Cullather, R. I.; Darmenov, A.; da Silva, A.; Kurosu, T. P.

    2015-12-01

    Bromine radicals (Br + BrO) are important species owing to the ability to destroy ozone catalytically. They may also impact oxidative pathways of many trace gases including dimethylsulfide (DMS) and mercury. Bromine monoxide (BrO) is the most commonly observed bromine radical species. Since it absorbs ultraviolet (UV) radiation, it can be observed using remote sensing technique including Differential Optical Absorption Spectroscopy (DOAS). Previous studies have reported rapid enhancements tropospheric BrO (so called "bromine explosion") connected to near-surface ozone depletion events during springtime in the Arctic. Space-based observation of BrO through Ozone Monitoring Instrument (OMI) is an excellent tool for studying bromine chemistry particularly for the Arctic due to its frequent observations at high latitudes. We derive tropospheric columns BrO by subtracting estimates of stratospheric column BrO from OMI total column BrO and air mass factor (AMF) correction, and analyze the tropospheric columns BrO in conjunction with Modern-Era Retrospective analysis for Research and Application (MERRA) meteorological fields provided by NASA Global Modeling and Assimilation Office (GMAO) in order to investigate a link between bromine explosion and near-surface meteorological factors.

  18. [Oxidation of mercury by CuBr2 decomposition under controlled-release membrane catalysis condition].

    Science.gov (United States)

    Hu, Lin-Gang; Qu, Zan; Yan, Nai-Qiang; Guo, Yong-Fu; Xie, Jiang-Kun; Jia, Jin-Ping

    2014-02-01

    CuBr2 in the multi-porous ceramic membrane can release Br2 at high temperature, which was employed as the oxidant for Hg0 oxidation. Hg0 oxidation efficiency was studied by a membrane catalysis device. Meanwhile, a reaction and in situ monitoring device was designed to avoid the impact of Br2 on the downstream pipe. The result showed that the MnO(x)/alpha-Al2O3 catalysis membrane had a considerable "controlled-release" effect on Br2 produced by CuBr2 decomposition. The adsorption and reaction of Hg0 and Br2 on the surface of catalysis membrane obeyed the Langmuir-Hinshelwood mechanism. The removal efficiency of Hg0 increased with the rising of Br2 concentration. However, when Br2 reached a certain concentration, the removal efficiency was limited by adsorption rate and reaction rate of Hg0 and Br2 on the catalysis membrane. From 473 K to 573 K, the variation of Hg0 oxidation efficiency was relatively stable. SO2 in flue gas inhibited the oxidation of Hg0 while NO displayed no obvious effect.

  19. Structural and photoluminescence properties of Dy3+ co-doped and Eu2+ activated MAl2O4 (M = Ba, Ca, Sr) nanophosphors

    Science.gov (United States)

    Dejene, F. B.; Kebede, M. A.; Redi-Abshiro, M.; Kgarebe, B. V.

    2013-09-01

    Long afterglow alkaline earth aluminates MAl2O4:Eu, Dy (M: Ca, Sr, Ba) phosphors are generally synthesized by the solid-state process which is more feasible than other conventional processes in terms of operation and large-scale production. However, the constituents of phosphors synthesized using this process are usually not mixed well, the particles agglomerates and very high temperature requirement to synthesize the final powder make it undesirable. In order to circumvent these problems, MAl2O4:Eu, Dy (Ca, Ba, Sr) phosphors were prepared at low temperatures (500 °C) by the solution-combustion of corresponding metal nitrate-urea solution mixtures, over a time of 5-10 min. In order to elucidate the relationship between the constituent, structure and PL properties product's particle size, morphological and structural properties were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), energy dispersive X-ray spectrometer (EDS), while the characteristic luminescence properties were investigated using emission spectra. The low temperature monoclinic structure for both CaAl2O4 and SrAl2O4 and the hexagonal structure of BaAl2O4 were observed. The emission spectra of these phosphors indicated that all of them are broad band, and the only emission peaks around 448, 490 and 515 nm of CaAl2O4:Eu, Dy, BaAl2O4:Eu, Dy and SrAl2O4:Eu, Dy, respectively, are due to 5d → 4f transition of Eu2+. The decay curves implied that these phosphors contain fast, medium and slow-decay process. The Dy3+ trap levels may be considered to be responsible for the long afterglow phosphorescence at room temperature.

  20. NIST/ISAC standardization study: variability in assignment of intensity values to fluorescence standard beads and in cross calibration of standard beads to hard dyed beads.

    Science.gov (United States)

    Hoffman, Robert A; Wang, Lili; Bigos, Martin; Nolan, John P

    2012-09-01

    Results from a standardization study cosponsored by the International Society for Advancement of Cytometry (ISAC) and the US National Institute of Standards and Technology (NIST) are reported. The study evaluated the variability of assigning intensity values to fluorophore standard beads by bead manufacturers and the variability of cross calibrating the standard beads to stained polymer beads (hard-dyed beads) using different flow cytometers. Hard dyed beads are generally not spectrally matched to the fluorophores used to stain cells, and spectral response varies among flow cytometers. Thus if hard dyed beads are used as fluorescence calibrators, one expects calibration for specific fluorophores (e.g., FITC or PE) to vary among different instruments. Using standard beads surface-stained with specific fluorophores (FITC, PE, APC, and Pacific Blue™), the study compared the measured intensity of fluorophore standard beads to that of hard dyed beads through cross calibration on 133 different flow cytometers. Using robust CV as a measure of variability, the variation of cross calibrated values was typically 20% or more for a particular hard dyed bead in a specific detection channel. The variation across different instrument models was often greater than the variation within a particular instrument model. As a separate part of the study, NIST and four bead manufacturers used a NIST supplied protocol and calibrated fluorophore solution standards to assign intensity values to the fluorophore beads. Values assigned to the reference beads by different groups varied by orders of magnitude in most cases, reflecting differences in instrumentation used to perform the calibration. The study concluded that the use of any spectrally unmatched hard dyed bead as a general fluorescence calibrator must be verified and characterized for every particular instrument model. Close interaction between bead manufacturers and NIST is recommended to have reliable and uniformly assigned

  1. Thermal properties of (Dy{sub x}Gd{sub 1-x}){sub 3}Ga{sub 5}O{sub 12} garnet single crystals

    Energy Technology Data Exchange (ETDEWEB)

    Numazawa, T.; Kimura, H.; Maeda, H. [Tsukuba Magnet Labs., Tsukuba (Japan)] [and others

    1997-06-01

    The solid solution (Dy{sub x}Gd{sub 1-x}){sub 3}Ga{sub 5}O{sub 12} garnet is proposed as a high heat capacity material below 2 K for regenerator. A short range order interaction resulting from the magnetic frustration in Gd{sub 3}Ga{sub 5}O{sub 12} gives a considerably high heat capacity below 2 K. At a magnetic field B = {approximately}1 T, Gd{sub 3}Ga{sub 5}O{sub 12} has a sharp anomaly in its specific heat at {approximately}0.37 K related to an antiferromagnetic transition, keeping the large heat capacity. By substituting Gd ion by Dy ion, an anisotropy will be produced in (Dy{sub x}Gd{sub 1-x}){sub 3}Ga{sub 5}O{sub 12} and it enhances the antiferromagnetic long range order interactions. The specific heat measurement for (Dy{sub 0.5}Gd{sub 0.5}){sub 3}Ga{sub 5}O{sub 12} at B = 0 T showed that heat capacity of (Dy{sub 0.5}Gd{sub 0.5}){sub 3}Ga{sub 5}O{sub 12} is comparable largely to that of Gd{sub 3}Ga{sub 5}O{sub 12} and a transition temperature may be found below 0.6 K. From the thermal conductivity measurement, a strong correlation with magnetic field has been found. The reduction in the thermal conductivity caused by the magnetic field is the largest in Dy{sub 3}Ga{sub 5}O{sub 12} and it decreases by increasing the concentration of Gd ion.

  2. Comparison of structural and luminescence properties of Dy{sub 2}O{sub 3} nanopowders synthesized by co-precipitation and green combustion routes

    Energy Technology Data Exchange (ETDEWEB)

    Chandrasekhar, M. [Prof. C.N.R. Rao Centre for Advanced Materials, Tumkur University, Tumkur 572 103 (India); Department of Physics, Acharya Institute of Technology, Bangalore 560 107 (India); Nagabhushana, H., E-mail: bhushanvlc@gmail.com [Prof. C.N.R. Rao Centre for Advanced Materials, Tumkur University, Tumkur 572 103 (India); Sudheerkumar, K.H. [Department of Chemistry, B.M.S. Institute of Technology, Bangalore 560 064 (India); Dhananjaya, N. [Department of Physics, B.M.S. Institute of Technology, Bangalore 560 064 (India); Sharma, S.C. [Vice chancellor, Chhattisgarh Swamy Vivekananda Technical University, North Park Avenue, Sector – 8, Bhilai, Chhattisgarh 490 009 (India); Kavyashree, D. [Department of Physics, Channabasaveshwara Institute of Technology, Gubbi 572 216 (India); Shivakumara, C. [Solid State and Structural Chemistry Unit, Indian Institute of Science, Bangalore 560 012 (India); Nagabhushana, B.M. [Department of Chemistry, M.S. Ramaiah Institute of Technology, Bangalore 560 054 (India)

    2014-07-01

    Highlights: • Dy{sub 2}O{sub 3} nanopowders were prepared by co-precipitation and eco-friendly green combustion route using plant latex. • Both the products show excellent chromaticity coordinates in the white region, which were quite useful for white LED’s. • Thermoluminescence response of the Dy{sub 2}O{sub 3} product prepared by green synthesis was higher when compared to co-precipitation route. • Structural parameters of Dy{sub 2}O{sub 3} were estimated using Rietveld refinement. • The development of nanosize materials using eco-friendly resources was an attractive non-hazardous chemical route. - Abstract: Dysprosium oxide (Dy{sub 2}O{sub 3}) nanopowders were prepared by co-precipitation (CP) and eco-friendly green combustion (GC) routes. SEM micrographs prepared by CP route show smooth rods with various lengths and diameters while, GC route show porous, agglomerated particles. The results were further confirmed by TEM. Thermoluminescence (TL) responses of the nanopowder prepared by both the routes were studied using γ-rays. A well resolved glow peak at 353 °C along with less intense peak at 183 °C was observed in GC route while, in CP a single glow peak at 364 °C was observed. The kinetic parameters were estimated using Chen’s glow peak route. Photoluminescence (PL) of Dy{sub 2}O{sub 3} shows peaks at 481, 577, 666 and 756 nm which were attributed to Dy{sup 3+} transitions of {sup 4}F{sub 9/2}⟶{sup 6}H{sub 15/2}, {sup 6}H{sub 13/2}, {sup 6}H{sub 11/2} and {sup 6}H{sub 9/2}, respectively. Color co-ordinate values were located in the white region as a result the product may be useful for the fabrication of WLED’S.

  3. Parent-child discrepancy in the assessment of health- related quality of life using the EQ-5D-Y questionnaire.

    Science.gov (United States)

    Perez Sousa, Miguel Á; Olivares Sánchez-Toledo, Pedro R; Gusi Fuerte, Narcis

    2017-12-01

    The assessment of health-related quality of life (HRQoL) serves to detect changes over time in patients' health status and allows to do a cost-effectiveness analysis of treatments. When children with special health features cannot perform a self-assessment, it is possible to assess their HRQoL through their parents or caregivers. To date, the discrepancy in the assessment of HRQoL using the EQ-5D-Y questionnaire among children with cerebral palsy (CP) and their parents has not been analyzed. The objective of this study was to analyze the level of agreement in the HRQoL assessment using the EQ-5D-Y questionnaire and its proxy version among children with CP and their parents or caregivers. Children and adolescents with CP, and their parents, from a special education school in the region of Extremadura (Spain) participated in the study. The EQ-5D-Y questionnaire was used for children and the EQ-5D-Y proxy version, for parents. Interviews were conducted in the first quarter of 2015. The level of agreement in the responses was analyzed using the Cohen's kappa coefficient for the five domains of the EQ-5D-Y and the intraclass correlation coefficient for the visual analogue scale. Sixty-two children with CP and mild and/or moderate functional capacity impairment, and their parents, participated in the study. The level of agreement was poor in the HRQoL assessment between children and parents in all the questionnaire domains ( parent-child disagreement was observed in the HRQoL assessment in the population with CP using the EQ-5D-Y questionnaire.

  4. Magnetic entropy change of a rare earth garnet (Gd{sub 0.5}Dy{sub 0.5}){sub 3}(Ga{sub 0.875}Fe{sub 0.125}){sub 5}O{sub 12}

    Energy Technology Data Exchange (ETDEWEB)

    Matsumoto, Koichi; Okano, Takahiro; Matsuzaki, Ayumi; Kamiya, Koji; Numazawa, Takenori

    2003-05-01

    The working refrigerant in magnetic refrigerators has been Gd{sub 3}Ga{sub 5}O{sub 12} (GGG) in the temperature range from 1 to 15 K. It has been shown that substitution of Ga for Fe in GGG can make entropy change large in high-temperature region. In order to increase the entropy change with small magnetic field, substitution of Gd for Dy is expected to be useful because of larger g-factor of Dy than Gd. The magnetization of (Gd{sub 0.5}Dy{sub 0.5}){sub 3}(Ga{sub 0.875}Fe{sub 0.125}){sub 5}O{sub 12} (GDGIG) was measured and the entropy change was calculated. This compound had larger entropy change with small magnetic field than that without Dy, though the absolute entropy change at low temperatures with large applied field was smaller due to the ground state doublet of Dy.

  5. Hospitalidade Organizacional: Panorama Teórico-Empírico

    Directory of Open Access Journals (Sweden)

    José Alberto Carvalho dos Santos Claro

    2015-10-01

    Full Text Available O objetivo deste texto é o de apresentar as discussões teórico-conceituais sobre Hospitalidade, particularmente a vertente da Hospitalidade Organizacional (HO, que se ocupa das relações hospitaleiras no ambiente do espaço de trabalho. Trata-se de um estudo exploratório, baseado em revisão bibliográfica, seguida de pesquisa de campo por meio de levantamento junto a gestores de pessoas (especialistas ou juízes, sobre o entendimento do tema, visando contribuir para a futura criação de escala de medida para quantificar o grau de HO em uma organização. Como resultado, apresenta-se contribuição teórica para o amadurecimento desta tendência organizacional e indicadores que poderão ser futuramente usados em estudos empíricos e na construção de um instrumento com escala validada para ser utilizada em organizações em qualquer setor de atividade econômica. Palavras-chave: Hospitalidade. Hospitalidade Organizacional. Gestão de Pessoas.Organizational Hospitality: Theorical and Empirical Developments This paper aim is to present the theoretical and conceptual discussions about hospitality, particularly the  Organizational Hospitality (OH, which is concerned with the hospitable relations in the workplace. It’s an exploratory study, based on literature review and field survey with people managers (experts or judges about their understanding about the question. The result indicates that the development of organizational indicators could be used in future empirical studies and to the construction of a validated scale that can be used in any sector of the economic activity. Keywords: Hospitality. Organizational Hospitality. People Management. Indicators.José Alberto Carvalho dos Santos Claro – Doutor. Professor Adjunto da Universidade Federal de São Paulo [UNIFESP], Campus Baixada Santista, Santos, SP. Endereço Lattes http://lattes.cnpq.br/0865792662046289 E-mail: albertoclaro@albertoclaro.pro.br  

  6. Evidence for SrHo2O4 and SrDy2O4 as model J1-J2 zigzag chain materials

    DEFF Research Database (Denmark)

    Fennell, A.; Pomjakushin, V. Y.; Uldry, A.

    2014-01-01

    Neutron diffraction and inelastic spectroscopy is used to characterize the magnetic Hamiltonian of SrHo2O4 and SrDy2O4. Through a detailed computation of the crystal-field levels we find site-dependent anisotropic single-ion magnetism in both materials, and diffraction measurements show the prese......Neutron diffraction and inelastic spectroscopy is used to characterize the magnetic Hamiltonian of SrHo2O4 and SrDy2O4. Through a detailed computation of the crystal-field levels we find site-dependent anisotropic single-ion magnetism in both materials, and diffraction measurements show...

  7. A study of the convective flow as a function of external parameters in a high-pressure metal halide discharge lamp (HgDyI3)

    Science.gov (United States)

    Hajji, S.; HadjSalah, S.; Benhalima, A.; Charrada, K.; Zissis, G.

    2016-06-01

    This paper deals with the modelling of the convection processes in metal-halide lamp discharges (HgDyI3). For this, we realized a 3D model, a steady, direct current powered and time-depending model for the solution of conservation equations relative to mass, momentum, and energy. After validation, this model was applied to the study of the effect of some parameters that have appeared on major transport phenomena of mass and energy in studying the lamp. Indeed, the electric current, the atomic ratio (Hg/Dy), and the effect of the convective transport have been studied.

  8. Numerical simulation of the electromagnetic decay of the nuclei {sup 152,154,156}Dy with self-consistent collective strength functions

    Energy Technology Data Exchange (ETDEWEB)

    Martin, V. [Analisis Numerico, Facultad de Informatica, Universidad Politecnica de Madrid, E-28660 Madrid (Spain); Egido, J.L. [Departamento de Fisica Teorica C-XI, Universidad Autonoma de Madrid, E-28049 Madrid (Spain); Khoo, T.L.; Lauritsen, T. [Argonne National Laboratory, Argonne, Illinois 60439 (United States)

    1995-06-01

    The electromagnetic decay of the nuclei {sup 152,154,156}Dy is analyzed using microscopic Hartree-Fock calculations at finite temperature. The theoretical collective transition probabilities are implemented in numerical simulations to produce theoretical spectra. Thermal shape fluctuations are also taken into account. The inclusion of these correlation is crucial in order to understand the main features of the collective {ital E}2 spectra of these isotopes at different energies. The theoretical calculations suggest a shape change as responsible for the unusual features of the spectrum of the nucleus {sup 154}Dy at high energy.

  9. Structure and optical properties of Dy3+/Tm3+ co-doped oxyfluoride glass ceramics containing β-NaGdF4 nanocrystals

    Science.gov (United States)

    Sun, Xiao; Zhao, Shilong; Fei, Yong; Huang, Lihui; Xu, Shiqing

    2014-12-01

    Dy3+/Tm3+ co-doped oxyfluoride glass ceramics containing hexagonal β-NaGdF4 nanocrystals were prepared by the melt-quenching method and subsequent heat-treatment procedure. During the crystallization process, the structural evolution of glass network was systematically investigated using XRD, TEM and FTIR spectra. Experimental results provided new evidences that a silica-enriched layer around the precipitated fluoride nanocrystals was formed during the crystallization process. Strong white light emission was obtained in the oxyfluoride glass ceramics by modifying the relative concentration ratio of Tm3+ and Dy3+ ions.

  10. Smooth transition between SMM and SCM-type slow relaxing dynamics for a 1-D assemblage of {Dy(nitronyl nitroxide)2} units.

    Science.gov (United States)

    Liu, Ruina; Li, Licun; Wang, Xiaoling; Yang, Peipei; Wang, Chao; Liao, Daizheng; Sutter, Jean-Pascal

    2010-04-21

    A model example for size effects on the dynamic susceptibility behavior is provided by the chain compound [{Dy(hfac)(3)NitPhIm(2)}Dy(hfac)(3)] (NitPhIm = 2-[4-(1-imidazole)phenyl]nitronyl nitroxide radical). The Arrhenius plot reveals two relaxation regimes attributed to SMM (Delta = 17.1 K and tau(0) = 17.5 x 10(-6) s) and SCM (Delta = 82.7 K and tau(0) = 8.8 x 10(-8) s) behaviors. The ferromagnetic exchange among the spin carriers has been established for the corresponding Gd derivative.

  11. A study of the convective flow as a function of external parameters in a high-pressure metal halide discharge lamp (HgDyI{sub 3})

    Energy Technology Data Exchange (ETDEWEB)

    Hajji, S.; HadjSalah, S.; Benhalima, A.; Charrada, K. [Unité d' Etude des Milieux Ionisés et Réactifs, IPEIM, 5019 route de Kairouan Monastir, Université de Monastir (Tunisia); Zissis, G. [Laboratoire Plasma et Conversion d' Énergie, 118 rte Narbonne, Bât3R2, 31062 Toulouse (France)

    2016-06-15

    This paper deals with the modelling of the convection processes in metal–halide lamp discharges (HgDyI{sub 3}). For this, we realized a 3D model, a steady, direct current powered and time-depending model for the solution of conservation equations relative to mass, momentum, and energy. After validation, this model was applied to the study of the effect of some parameters that have appeared on major transport phenomena of mass and energy in studying the lamp. Indeed, the electric current, the atomic ratio (Hg/Dy), and the effect of the convective transport have been studied.

  12. Nqrs Data for Al2BrH6LiO6 [Al2LiBr(OH)6] (Subst. No. 0056)

    Science.gov (United States)

    Chihara, H.; Nakamura, N.

    This document is part of Subvolume A `Substances Containing Ag … C10H15' of Volume 48 `Nuclear Quadrupole Resonance Spectroscopy Data' of Landolt-Börnstein - Group III `Condensed Matter'. It contains an extract of Section `3.2 Data tables' of the Chapter `3 Nuclear quadrupole resonance data' providing the NQRS data for Al2BrH6LiO6 [Al2LiBr(OH)6] (Subst. No. 0056)

  13. NY-BR-1 Antigen Expression and anti-NY-BR-1 IgG in Egyptian Breast Cancer Patients: Clinicopathological and Prognostic Significance.

    Science.gov (United States)

    Abu El-Nazar, Salma Y; Ghazy, Amany A; Ghoneim, Hossam E; Zoheir, Malak; Ahmed, Ahmed S; Sorour, Sally S; Abouelella, Amira M

    2015-01-01

    Breast cancer is the most common gynecological malignancy in the world. In Egypt, it ranks the first among female malignancies with incidence of 37.7%. Over the last decades, the integration of prognostic and predictive markers in treatment decisions has led to more individualized and optimized therapy. NY-BR-1 antigen has been shown to be frequently expressed in breast cancers. The study aimed to assess the tissue expression of NY-BR-1 antigen and serum IgG antibody to this antigen in Egyptian breast cancer females. The study was conducted on 60 females (10 healthy, 10 having benign breast lesions, 40 with malignant breast cancer). NY-BR-1 Ag expression was evaluated by immunohistochemistry and anti-NY-BR-1 IgG was assessed by ELISA. Results revealed a significant difference in NY-BR-1 Ag expression between benign and malignant breast cancer patients. There was a significant correlation between NY-BR-1 antigen expression and estrogen receptor's status (P = 0.019), stage of the disease (P = 0.008), menopausal status (P = 0.008), lymph node involvement (P = 0.022) and anti-NY-BR-1 IgG (P = 0.032) among the studied individuals. In addition, there was a statistically significant increase in anti-NY-BR-1 IgG O.D. results among malignant breast cancer group. It is correlated with tumor type (P 1) and progesterone receptor status (P = 0.038). In conclusion, our work may represent a step towards identification of a new prognostic marker specific for breast cancer.

  14. Studies of scintillation light nonproportionality of ZnSe(Te), CsI(Tl) and YAP(Ce) crystals using heavy ions

    CERN Document Server

    Klamra, W; Kapusta, M; Kérek, A; Moszynski, M; Norlin, L O; Novák, D; Possnert, G

    2002-01-01

    The scintillation light yield for ZnSe(Te), CsI(Tl) and YAP(Ce) crystals have been studied with alpha particles, sup 1 sup 2 C and sup 8 sup 1 Br in the energy region 2.8-42.2 MeV. A nonproportional behavior was observed, mostly pronounced for alpha particles on YAP(Ce). The results are understood in terms of delta-rays effect.

  15. Strange particle production in proton-proton collisions at $\\sqrt{s}$ = 0.9 TeV with ALICE at the LHC

    CERN Document Server

    INSPIRE-00247373; Abrahantes Quintana, A.; Adamova, D.; Adare, A.M.; Aggarwal, M.M.; Aglieri Rinella, G.; Agocs, A.G.; Aguilar Salazar, S.; Ahammed, Z.; Ahmad, N.; Ahmad Masoodi, A.; Ahn, S.U.; Akindinov, A.; Aleksandrov, D.; Alessandro, B.; Alfaro Molina, R.; Alici, A.; Alkin, A.; Almaraz Avina, E.; Alt, T.; Altini, V.; Altinpinar, S.; Altsybeev, I.; Andrei, C.; Andronic, A.; Anguelov, V.; Anson, C.; Anticic, T.; Antinori, F.; Antonioli, P.; Aphecetche, L.; Appelshauser, H.; Arbor, N.; Arcelli, S.; Arend, A.; Armesto, N.; Arnaldi, R.; Aronsson, T.; Arsene, I.C.; Asryan, A.; Augustinus, A.; Averbeck, R.; Awes, T.C.; Aysto, J.; Azmi, M.D.; Bach, M.; Badala, A.; Baek, Y.W.; Bagnasco, S.; Bailhache, R.; Bala, R.; Baldini Ferroli, R.; Baldisseri, A.; Baldit, A.; Ban, J.; Barbera, R.; Barile, F.; Barnafoldi, G.G.; Barnby, L.S.; Barret, V.; Bartke, J.; Basile, M.; Bastid, N.; Bathen, B.; Batigne, G.; Batyunya, B.; Baumann, C.; Bearden, I.G.; Beck, H.; Belikov, I.; Bellini, F.; Bellwied, R.; Belmont-Moreno, E.; Beole, S.; Berceanu, I.; Bercuci, A.; Berdermann, E.; Berdnikov, Y.; Betev, L.; Bhasin, A.; Bhati, A.K.; Bianchi, L.; Bianchi, N.; Bianchin, C.; Bielcik, J.; Bielcikova, J.; Bilandzic, A.; Biolcati, E.; Blanc, A.; Blanco, F.; Blanco, F.; Blau, D.; Blume, C.; Boccioli, M.; Bock, N.; Bogdanov, A.; Boggild, H.; Bogolyubsky, M.; Boldizsar, L.; Bombara, M.; Bombonati, C.; Book, J.; Borel, H.; Bortolin, C.; Bose, S.; Bossu, F.; Botje, M.; Bottger, S.; Boyer, B.; Braun-Munzinger, P.; Bravina, L.; Bregant, M.; Breitner, T.; Broz, M.; Brun, R.; Bruna, E.; Bruno, G.E.; Budnikov, D.; Buesching, H.; Busch, O.; Buthelezi, Z.; Caffarri, D.; Cai, X.; Caines, H.; Calvo Villar, E.; Camerini, P.; Canoa Roman, V.; Cara Romeo, G.; Carena, F.; Carena, W.; Carminati, F.; Casanova Diaz, A.; Caselle, M.; Castillo Castellanos, J.; Catanescu, V.; Cavicchioli, C.; Cerello, P.; Chang, B.; Chapeland, S.; Charvet, J.L.; Chattopadhyay, S.; Chattopadhyay, S.; Cherney, M.; Cheshkov, C.; Cheynis, B.; Chiavassa, E.; Chibante Barroso, V.; Chinellato, D.D.; Chochula, P.; Chojnacki, M.; Christakoglou, P.; Christensen, C.H.; Christiansen, P.; Chujo, T.; Cicalo, C.; Cifarelli, L.; Cindolo, F.; Cleymans, J.; Coccetti, F.; Coffin, J.P.; Coli, S.; Conesa Balbastre, G.; Conesa del Valle, Z.; Constantin, P.; Contin, G.; Contreras, J.G.; Cormier, T.M.; Corrales Morales, Y.; Cortes Maldonado, I.; Cortese, P.; Cosentino, M.R.; Costa, F.; Cotallo, M.E.; Crescio, E.; Crochet, P.; Cuautle, E.; Cunqueiro, L.; D'Erasmo, G.; Dainese, A.; Dalsgaard, H.H.; Danu, A.; Das, D.; Das, I.; Dash, A.; Dash, S.; De, S.; De Azevedo Moregula, A.; de Barros, G.O.V.; De Caro, A.; de Cataldo, G.; de Cuveland, J.; De Falco, A.; De Gruttola, D.; De Marco, N.; De Pasquale, S.; De Remigis, R.; de Rooij, R.; Delagrange, H.; Delgado Mercado, Y.; Dellacasa, G.; Deloff, A.; Demanov, V.; Denes, E.; Deppman, A.; Di Bari, D.; Di Giglio, C.; Di Liberto, S.; Di Mauro, A.; Di Nezza, P.; Dietel, T.; Divia, R.; Djuvsland, O.; Dobrin, A.; Dobrowolski, T.; Dominguez, I.; Donigus, B.; Dordic, O.; Driga, O.; Dubey, A.K.; Dubuisson, J.; Ducroux, L.; Dupieux, P.; Dutta Majumdar, A.K.; Dutta Majumdar, M.R.; Elia, D.; Emschermann, D.; Engel, H.; Erdal, H.A.; Espagnon, B.; Estienne, M.; Esumi, S.; Evans, D.; Evrard, S.; Eyyubova, G.; Fabjan, C.W.; Fabris, D.; Faivre, J.; Falchieri, D.; Fantoni, A.; Fasel, M.; Fearick, R.; Fedunov, A.; Fehlker, D.; Fekete, V.; Felea, D.; Feofilov, G.; Fernandez Tellez, A.; Ferretti, A.; Ferretti, R.; Figueredo, M.A.S.; Filchagin, S.; Fini, R.; Finogeev, D.; Fionda, F.M.; Fiore, E.M.; Floris, M.; Foertsch, S.; Foka, P.; Fokin, S.; Fragiacomo, E.; Fragkiadakis, M.; Frankenfeld, U.; Fuchs, U.; Furano, F.; Furget, C.; Fusco Girard, M.; Gaardhoje, J.J.; Gadrat, S.; Gagliardi, M.; Gago, A.; Gallio, M.; Ganoti, P.; Garabatos, C.; Gemme, R.; Gerhard, J.; Germain, M.; Geuna, C.; Gheata, A.; Gheata, M.; Ghidini, B.; Ghosh, P.; Girard, M.R.; Giraudo, G.; Giubellino, P.; Gladysz-Dziadus, E.; Glassel, P.; Gomez, R.; Gonzalez-Trueba, L.H.; Gonzalez-Zamora, P.; Gonzalez Santos, H.; Gorbunov, S.; Gotovac, S.; Grabski, V.; Grajcarek, R.; Grelli, A.; Grigoras, A.; Grigoras, C.; Grigoriev, V.; Grigoryan, A.; Grigoryan, S.; Grinyov, B.; Grion, N.; Gros, P.; Grosse-Oetringhaus, J.F.; Grossiord, J.Y.; Grosso, R.; Guber, F.; Guernane, R.; Guerra Gutierrez, C.; Guerzoni, B.; Gulbrandsen, K.; Gunji, T.; Gupta, A.; Gupta, R.; Gutbrod, H.; Haaland, O.; Hadjidakis, C.; Haiduc, M.; Hamagaki, H.; Hamar, G.; Harris, J.W.; Hartig, M.; Hasch, D.; Hasegan, D.; Hatzifotiadou, D.; Hayrapetyan, A.; Heide, M.; Heinz, M.; Helstrup, H.; Herghelegiu, A.; Hernandez, C.; Herrera Corral, G.; Herrmann, N.; Hetland, K.F.; Hicks, B.; Hille, P.T.; Hippolyte, B.; Horaguchi, T.; Hori, Y.; Hristov, P.; Hrivnacova, I.; Huang, M.; Huber, S.; Humanic, T.J.; Hwang, D.S.; Ichou, R.; Ilkaev, R.; Ilkiv, I.; Inaba, M.; Incani, E.; Innocenti, G.M.; Innocenti, P.G.; Ippolitov, M.; Irfan, M.; Ivan, C.; Ivanov, A.; Ivanov, M.; Ivanov, V.; Jacholkowski, A.; Jacobs, P.M.; Jancurova, L.; Jangal, S.; Janik, R.; Jayarathna, S.P.; Jena, S.; Jirden, L.; Jones, G.T.; Jones, P.G.; Jovanovic, P.; Jung, H.; Jung, W.; Jusko, A.; Kalcher, S.; Kalinak, P.; Kalisky, M.; Kalliokoski, T.; Kalweit, A.; Kamermans, R.; Kanaki, K.; Kang, E.; Kang, J.H.; Kaplin, V.; Karavichev, O.; Karavicheva, T.; Karpechev, E.; Kazantsev, A.; Kebschull, U.; Keidel, R.; Khan, M.M.; Khanzadeev, A.; Kharlov, Y.; Kileng, B.; Kim, D.J.; Kim, D.S.; Kim, D.W.; Kim, H.N.; Kim, J.H.; Kim, J.S.; Kim, M.; Kim, M.; Kim, S.; Kim, S.H.; Kirsch, S.; Kisel, I.; Kiselev, S.; Kisiel, A.; Klay, J.L.; Klein, J.; Klein-Bosing, C.; Kliemant, M.; Klovning, A.; Kluge, A.; Knichel, M.L.; Koch, K.; Kohler, M.K.; Kolevatov, R.; Kolojvari, A.; Kondratiev, V.; Kondratyeva, N.; Konevskih, A.; Kornas, E.; Kottachchi Kankanamge Don, C.; Kour, R.; Kowalski, M.; Kox, S.; Kozlov, K.; Kral, J.; Kralik, I.; Kramer, F.; Kraus, I.; Krawutschke, T.; Kretz, M.; Krivda, M.; Krumbhorn, D.; Krus, M.; Kryshen, E.; Krzewicki, M.; Kucheriaev, Y.; Kuhn, C.; Kuijer, P.G.; Kurashvili, P.; Kurepin, A.; Kurepin, A.B.; Kuryakin, A.; Kushpil, S.; Kushpil, V.; Kweon, M.J.; Kwon, Y.; La Rocca, P.; Ladron de Guevara, P.; Lafage, V.; Lara, C.; Larsen, D.T.; Lazzeroni, C.; Le Bornec, Y.; Lea, R.; Lee, K.S.; Lee, S.C.; Lefevre, F.; Lehnert, J.; Leistam, L.; Lenhardt, M.; Lenti, V.; Leon Monzon, I.; Leon Vargas, H.; Levai, P.; Li, X.; Lietava, R.; Lindal, S.; Lindenstruth, V.; Lippmann, C.; Lisa, M.A.; Liu, L.; Loggins, V.R.; Loginov, V.; Lohn, S.; Lohner, D.; Lopez, X.; Lopez Noriega, M.; Lopez Torres, E.; Lovhoiden, G.; Lu, X.G.; Luettig, P.; Lunardon, M.; Luparello, G.; Luquin, L.; Luzzi, C.; Ma, K.; Ma, R.; Madagodahettige-Don, D.M.; Maevskaya, A.; Mager, M.; Mahapatra, D.P.; Maire, A.; Malaev, M.; Maldonado Cervantes, I.; Mal'Kevich, D.; Malzacher, P.; Mamonov, A.; Manceau, L.; Mangotra, L.; Manko, V.; Manso, F.; Manzari, V.; Mao, Y.; Mares, J.; Margagliotti, G.V.; Margotti, A.; Marin, A.; Martashvili, I.; Martinengo, P.; Martinez, M.I.; Martinez Davalos, A.; Martinez Garcia, G.; Martynov, Y.; Mas, A.; Masciocchi, S.; Masera, M.; Masoni, A.; Massacrier, L.; Mastromarco, M.; Mastroserio, A.; Matthews, Z.L.; Matyja, A.; Mayani, D.; Mazza, G.; Mazzoni, M.A.; Meddi, F.; Menchaca-Rocha, A.; Mendez Lorenzo, P.; Mercado Perez, J.; Mereu, P.; Miake, Y.; Midori, J.; Milano, L.; Milosevic, J.; Mischke, A.; Miskowiec, D.; Mitu, C.; Mlynarz, J.; Mohanty, B.; Molnar, L.; Montano Zetina, L.; Monteno, M.; Montes, E.; Morando, M.; Moreira De Godoy, D.A.; Moretto, S.; Morsch, A.; Muccifora, V.; Mudnic, E.; Muller, H.; Muhuri, S.; Munhoz, M.G.; Munoz, J.; Musa, L.; Musso, A.; Nandi, B.K.; Nania, R.; Nappi, E.; Nattrass, C.; Navach, F.; Navin, S.; Nayak, T.K.; Nazarenko, S.; Nazarov, G.; Nedosekin, A.; Nendaz, F.; Newby, J.; Nicassio, M.; Nielsen, B.S.; Nikolaev, S.; Nikolic, V.; Nikulin, S.; Nikulin, V.; Nilsen, B.S.; Nilsson, M.S.; Noferini, F.; Nooren, G.; Novitzky, N.; Nyanin, A.; Nyatha, A.; Nygaard, C.; Nystrand, J.; Obayashi, H.; Ochirov, A.; Oeschler, H.; Oh, S.K.; Oleniacz, J.; Oppedisano, C.; Ortiz Velasquez, A.; Ortona, G.; Oskarsson, A.; Ostrowski, P.; Otterlund, I.; Otwinowski, J.; Ovrebekk, G.; Oyama, K.; Ozawa, K.; Pachmayer, Y.; Pachr, M.; Padilla, F.; Pagano, P.; Paic, G.; Painke, F.; Pajares, C.; Pal, S.; Pal, S.K.; Palaha, A.; Palmeri, A.; Pappalardo, G.S.; Park, W.J.; Paticchio, V.; Pavlinov, A.; Pawlak, T.; Peitzmann, T.; Peresunko, D.; Perez Lara, C.E.; Perini, D.; Perrino, D.; Peryt, W.; Pesci, A.; Peskov, V.; Pestov, Y.; Peters, A.J.; Petracek, V.; Petris, M.; Petrov, P.; Petrovici, M.; Petta, C.; Piano, S.; Piccotti, A.; Pikna, M.; Pillot, P.; Pinazza, O.; Pinsky, L.; Pitz, N.; Piuz, F.; Piyarathna, D.B.; Platt, R.; Ploskon, M.; Pluta, J.; Pocheptsov, T.; Pochybova, S.; Podesta-Lerma, P.L.M.; Poghosyan, M.G.; Polak, K.; Polichtchouk, B.; Pop, A.; Pospisil, V.; Potukuchi, B.; Prasad, S.K.; Preghenella, R.; Prino, F.; Pruneau, C.A.; Pshenichnov, I.; Puddu, G.; Pulvirenti, A.; Punin, V.; Putis, M.; Putschke, J.; Quercigh, E.; Qvigstad, H.; Rachevski, A.; Rademakers, A.; Rademakers, O.; Radomski, S.; Raiha, T.S.; Rak, J.; Rakotozafindrabe, A.; Ramello, L.; Ramirez Reyes, A.; Rammler, M.; Raniwala, R.; Raniwala, S.; Rasanen, S.S.; Read, K.F.; Real, J.S.; Redlich, K.; Renfordt, R.; Reolon, A.R.; Reshetin, A.; Rettig, F.; Revol, J.P.; Reygers, K.; Ricaud, H.; Riccati, L.; Ricci, R.A.; Richter, M.; Riedler, P.; Riegler, W.; Riggi, F.; Rivetti, A.; Rodriguez Cahuantzi, M.; Rohr, D.; Rohrich, D.; Romita, R.; Ronchetti, F.; Rosinsky, P.; Rosnet, P.; Rossegger, S.; Rossi, A.; Roukoutakis, F.; Rousseau, S.; Roy, C.; Roy, P.; Rubio Montero, A.J.; Rui, R.; Rusanov, I.; Ryabinkin, E.; Rybicki, A.; Sadovsky, S.; Safarik, K.; Sahoo, R.; Sahu, P.K.; Saiz, P.; Sakai, S.; Sakata, D.; Salgado, C.A.; Samanta, T.; Sambyal, S.; Samsonov, V.; Sandor, L.; Sandoval, A.; Sano, M.; Sano, S.; Santo, R.; Santoro, R.; Sarkamo, J.; Saturnini, P.; Scapparone, E.; Scarlassara, F.; Scharenberg, R.P.; Schiaua, C.; Schicker, R.; Schmidt, C.; Schmidt, H.R.; Schreiner, S.; Schuchmann, S.; Schukraft, J.; Schutz, Y.; Schwarz, K.; Schweda, K.; Scioli, G.; Scomparin, E.; Scott, P.A.; Scott, R.; Segato, G.; Senyukov, S.; Seo, J.; Serci, S.; Serradilla, E.; Sevcenco, A.; Shabratova, G.; Shahoyan, R.; Sharma, N.; Sharma, S.; Shigaki, K.; Shimomura, M.; Shtejer, K.; Sibiriak, Y.; Siciliano, M.; Sicking, E.; Siemiarczuk, T.; Silenzi, A.; Silvermyr, D.; Simonetti, G.; Singaraju, R.; Singh, R.; Sinha, B.C.; Sinha, T.; Sitar, B.; Sitta, M.; Skaali, T.B.; Skjerdal, K.; Smakal, R.; Smirnov, N.; Snellings, R.; Sogaard, C.; Soloviev, A.; Soltz, R.; Son, H.; Song, M.; Soos, C.; Soramel, F.; Spyropoulou-Stassinaki, M.; Srivastava, B.K.; Stachel, J.; Stan, I.; Stefanek, G.; Stefanini, G.; Steinbeck, T.; Stenlund, E.; Steyn, G.; Stocco, D.; Stock, R.; Stolpovskiy, M.; Strmen, P.; Suaide, A.A.P.; Subieta Vasquez, M.A.; Sugitate, T.; Suire, C.; Sumbera, M.; Susa, T.; Swoboda, D.; Symons, T.J.M.; Szanto de Toledo, A.; Szarka, I.; Szostak, A.; Tagridis, C.; Takahashi, J.; Tapia Takaki, J.D.; Tauro, A.; Tavlet, M.; Tejeda Munoz, G.; Telesca, A.; Terrevoli, C.; Thader, J.; Thomas, D.; Thomas, J.H.; Tieulent, R.; Timmins, A.R.; Tlusty, D.; Toia, A.; Torii, H.; Toscano, L.; Tosello, F.; Traczyk, T.; Truesdale, D.; Trzaska, W.H.; Tumkin, A.; Turrisi, R.; Turvey, A.J.; Tveter, T.S.; Ulery, J.; Ullaland, K.; Uras, A.; Urban, J.; Urciuoli, G.M.; Usai, G.L.; Vacchi, A.; Vala, M.; Valencia Palomo, L.; Vallero, S.; van der Kolk, N.; van Leeuwen, M.; Vande Vyvre, P.; Vannucci, L.; Vargas, A.; Varma, R.; Vasileiou, M.; Vasiliev, A.; Vechernin, V.; Venaruzzo, M.; Vercellin, E.; Vergara, S.; Vernet, R.; Verweij, M.; Vickovic, L.; Viesti, G.; Vikhlyantsev, O.; Vilakazi, Z.; Villalobos Baillie, O.; Vinogradov, A.; Vinogradov, L.; Vinogradov, Y.; Virgili, T.; Viyogi, Y.P.; Vodopyanov, A.; Voloshin, K.; Voloshin, S.; Volpe, G.; von Haller, B.; Vranic, D.; Vrlakova, J.; Vulpescu, B.; Wagner, B.; Wagner, V.; Wan, R.; Wang, D.; Wang, Y.; Wang, Y.; Watanabe, K.; Wessels, J.P.; Westerhoff, U.; Wiechula, J.; Wikne, J.; Wilde, M.; Wilk, A.; Wilk, G.; Williams, M.C.S.; Windelband, B.; Yang, H.; Yasnopolskiy, S.; Yi, J.; Yin, Z.; Yokoyama, H.; Yoo, I.K.; Yuan, X.; Yushmanov, I.; Zabrodin, E.; Zampolli, C.; Zaporozhets, S.; Zarochentsev, A.; Zavada, P.; Zbroszczyk, H.; Zelnicek, P.; Zenin, A.; Zgura, I.; Zhalov, M.; Zhang, X.; Zhou, D.; Zhu, X; Zichichi, A.; Zinovjev, G.; Zoccarato, Y.; Zynovyev, M.

    2011-01-01

    The production of mesons containing strange quarks (K0 S, f ) and both singly and doubly strange baryons (L, L, and X−+X+) are measured at central rapidity in pp collisions at √s = 0.9 TeV with the ALICE experiment at the LHC. The results are obtained from the analysis of about 250 k minimum bias events recorded in 2009. Measurements of yields (dN/dy) and transverse momentum spectra at central rapidities for inelastic pp collisions are presented. For mesons, we report yields (hdN/dyi) of 0.184 ± 0.002 (stat.) ± 0.006 (syst.) for K0S and 0.021 ± 0.004 (stat.) ± 0.003 (syst.) for phi. For baryons, we find dN/dy = 0.048±0.001 (stat.) ±0.004 (syst.) for Lambda, 0.047±0.002 (stat.) ±0.005 (syst.) for Lambda and 0.0094±0.0020 (stat.) ±0.0007 (syst.) for Xi−+Xi+. The results are also compared with predictions for identified particle spectra from QCD inspired models and provide a baseline for comparisons with both future pp measurements at higher energies and heavy-ion collisions

  16. Seasonal variability of branched glycerol dialkyl glycerol tetraethers (brGDGTs) in a temperate lake system

    Science.gov (United States)

    Loomis, Shannon E.; Russell, James M.; Heureux, Ana M.; D'Andrea, William J.; Sinninghe Damsté, Jaap S.

    2014-11-01

    Quantitative climate reconstructions are crucial for understanding the magnitude of and mechanisms behind natural and anthropogenic climate change, yet there are few proxies that can reliably reconstruct terrestrial temperature. Branched glycerol dialkyl glycerol tetraethers (brGDGTs) are bacterial membrane lipids that are increasingly used to reconstruct paleotemperature from lake sediments, but despite their potential, we have a poor understanding of (1) autochthonous vs. allochthonous sources of brGDGTs in lakes and (2) the seasonality of and environmental controls on brGDGT production within lakes. To investigate these factors, we examined water column suspended particulate matter (SPM) and settling particles from a sediment trap collected on a biweekly to monthly basis over a period of three years at Lower King Pond, a small kettle lake in northern Vermont, USA. We also compared the concentration and fractional abundances of brGDGTs in SPM and settling particles with those of catchment soils, river sediments, and lake surface sediments to constrain the relative importance of brGDGTs derived from the landscape versus brGDGTs produced within the lake itself. We find significant differences in concentrations and fractional abundances of brGDGTs between soil and river sediment samples from the catchment and lake sediments, indicating a mostly autochthonous source for lacustrine brGDGTs. BrGDGT concentrations, fluxes, and fractional abundances in SPM vary over the annual cycle, indicating that brGDGTs are produced throughout the year and respond to changes within the water column. The total annual flux of brGDGTs settling through the water column is comparable to the brGDGT accumulation rates in surface sediments, indicating that in this lake brGDGTs are mostly produced within the water column, not in the sediment itself. While brGDGTs are produced in all seasons within the water column, the flux to the sediments is highest during periods of spring and fall

  17. New cross section measurements for production of the positron emitters {sup 75}Br and {sup 76}Br via intermediate energy proton induced reactions

    Energy Technology Data Exchange (ETDEWEB)

    Spahn, I.; Coenen, H.H.; Qaim, S.M. [Forschungszentrum Juelich GmbH, Juelich (DE). Inst. fuer Neurowissenschaften und Biophysik - Nuklearchemie (INB 4); Steyn, G.F.; Vermeulen, C. [Radionuclide Production Group, iThemba LABS, Somerset West (South Africa); Kovacs, Z.; Szelecsenyi, F. [Cyclotron Dept., Inst. of Nuclear Research of the Hungarian Academy of Sciences (ATOMKI), Debrecen (Hungary)

    2009-07-01

    The radionuclides {sup 75}Br and {sup 76}Br are of considerable interest for application in Position Emission Tomography (PET). For their production so far mostly low-energy or low-yield production processes have been employed. In this work the production of both isotopes was investigated using intermediate energy proton induced reactions and enriched target materials. Cross section data of the {sup 77,78,80}Se(p, xn){sup 75}Br processes were measured up to 66 MeV and those of the {sup 77,78,80}Se(p, xn){sup 76}Br processes up to 85 MeV. The measured excitation functions were compared with calculated results of the nuclear model code ALICE-IPPE. From the experimental excitation curves, thick target yields were calculated. They are fairly high over the investigated intermediate energy ranges. The production possibilities of {sup 75}Br and {sup 76}Br via various routes and the radionuclidic impurities associated with them are discussed. (orig.)

  18. Tunable color emission via energy transfer in co-doped Ce3+/Dy3+: Li2O-LiF-B2O3-ZnO glasses for photonic applications

    Science.gov (United States)

    Vijayalakshmi, L.; Naveen Kumar, K.; Srinivasa Rao, K.; Hwang, Pyung

    2017-10-01

    A set of co-doped (Ce3+/Dy3+): LBZ glasses were prepared by standard melt quenching technique. The pertinent absorption bands were observed in the optical absorption spectrum of co-doped Ce3+/Dy3+: LBZ glasses. We have been observed a prominent blue and yellow emission pertaining to Dy3+ ions at 0.5 mol % under the excitation of 385 nm doped glasses. However, the photoluminescence intensities were remarkably enhanced by co-doping with Ce3+ ions to Dy3+: LBZ glasses due to energy transfer from Ce3+ to Dy3+. The emission spectra of co-doped (Ce3+/Dy3+): LBZ glass exhibits three strong emissions at 440 nm, 480 nm and 574 nm which are assigned with corresponding electronic transitions of 4I15/2 → 6H15/2, 4F9/2 → 6H15/2 and 4F9/2 → 6H13/2 respectively. The Commission International de E'clairage coordinates were calculated from their emission spectra of single doped Dy3+ and co-doped (Ce3+/Dy3+): LBZ glasses. The obtained CIE chromaticity coordinates for optimized co-doped glass are found to be very close to the standard white region. Based on the concentration of Ce3+, the emitting color of the co-doped glass can be changed from blue to white color. The transformation of the color from blue to white region due to energy transfer from Ce3+ to Dy3+. The energy transfer mechanism was substantiated by various fluorescence dynamics such as overlapped spectral profiles, photoluminescence, lifetime decay and CIE color coordinate analysis. These results could be suggested that the obtained co-doped (Ce3+/Dy3+): LBZ glasses are promising candidates for commercial white light applications.

  19. Charge stripe structure in FeTe

    Energy Technology Data Exchange (ETDEWEB)

    Kawashima, Y., E-mail: yukik@eng.hokudai.ac.jp [Department of Applied Physics, Hokkaido University, Sapporo 060-8628 (Japan); Ichimura, K. [Department of Applied Physics, Hokkaido University, Sapporo 060-8628 (Japan); Center of Education and Research for Topological Science and Technology, Hokkaido University, Sapporo 060-8628 (Japan); Ishioka, J. [Department of Applied Physics, Hokkaido University, Sapporo 060-8628 (Japan); Kurosawa, T. [Department of Physics, Hokkaido University, Sapporo 060-0810 (Japan); Oda, M. [Center of Education and Research for Topological Science and Technology, Hokkaido University, Sapporo 060-8628 (Japan); Department of Physics, Hokkaido University, Sapporo 060-0810 (Japan); Yamaya, K. [Department of Applied Physics, Hokkaido University, Sapporo 060-8628 (Japan); Tanda, S. [Department of Applied Physics, Hokkaido University, Sapporo 060-8628 (Japan); Center of Education and Research for Topological Science and Technology, Hokkaido University, Sapporo 060-8628 (Japan)

    2012-06-01

    We report the STM study on a single-crystalline sample of FeTe at 7.8 K. FeTe is one of the iron-based superconductor. We measured the resistivity and the magnetization of FeTe. FeTe shows SDW transition at 58 K on these measurements. We study the electronic state of FeTe by using STM/STS for observing FeTe from a microscopic viewpoint. We observed the iron layer and the tellurium layer with atomic resolution. Moreover, we discover the charge stripe structure on STM/STS measurement. We find the charge stripe structure is caused by iron atoms from the analysis. The gap structure of 9 meV was observed in tunneling spectra. This gap size is consistent with the SDW gap which is expected from mean field theory with T{sub N}=58 K.

  20. Judd-Ofelt analysis and spectral properties of Dy3+ ions doped niobium containing tellurium calcium zinc borate glasses

    Science.gov (United States)

    Ravi, O.; Reddy, C. Madhukar; Reddy, B. Sudhakar; Deva Prasad Raju, B.

    2014-02-01

    Niobium containing tellurium calcium zinc borate (TCZNB) glasses doped with different concentrations of Dy3+ ions were prepared by the melt quenching method and their optical properties have been studied. The Judd-Ofelt (J-O) intensity parameters Ωt (t=2, 4 and 6) were calculated using the least square fit method. Based on the magnitude of Ω2 parameter the hypersensitivity of 6H15/2→6F11/2 has also been discussed. From the evaluated J-O intensity parameters as well as from the emission and lifetime measurements, radiative transition properties such as radiative transition probability rates and branching ratios were calculated for 4F9/2 excited level. It is found that for Dy3+ ion, the transition 4F9/2→6H13/2 shows highest emission cross-section at 1.0 mol% TCZNB glass matrix. From the visible luminescence spectra, yellow to blue (Y/B) intensity ratios and chromaticity color coordinates were also estimated. The TCZNB glasses exhibit good luminescence properties and are suitable for generation of white light.

  1. Illumination correction of dyed fabrics approach using Bagging-based ensemble particle swarm optimization-extreme learning machine

    Science.gov (United States)

    Zhou, Zhiyu; Xu, Rui; Wu, Dichong; Zhu, Zefei; Wang, Haiyan

    2016-09-01

    Changes in illumination will result in serious color difference evaluation errors during the dyeing process. A Bagging-based ensemble extreme learning machine (ELM) mechanism hybridized with particle swarm optimization (PSO), namely Bagging-PSO-ELM, is proposed to develop an accurate illumination correction model for dyed fabrics. The model adopts PSO algorithm to optimize the input weights and hidden biases for the ELM neural network called PSO-ELM, which enhances the performance of ELM. Meanwhile, to further increase the prediction accuracy, a Bagging ensemble scheme is used to construct an independent PSO-ELM learning machine by taking bootstrap replicates of the training set. Then, the obtained multiple different PSO-ELM learners are aggregated to establish the prediction model. The proposed prediction model is evaluated with real dyed fabric images and discussed in comparison with several related methods. Experimental results show that the ensemble color constancy method is able to generate a more robust illuminant estimation model with better generalization performance.

  2. Y{sub 2}O{sub 3}: Dy{sup 3+}/Li{sup +} phosphors synthesized by spray

    Energy Technology Data Exchange (ETDEWEB)

    Balderas X, R.; Carmona T, S.; Falcony, C., E-mail: scarmonat81@gmail.com [IPN, Centro de Investigacion y de Estudios Avanzados, Apdo. Postal 14-740, 07000 Ciudad de Mexico (Mexico)

    2017-11-01

    Dysprosium and lithium-activated yttrium oxide phosphor was synthesized at 1100 degrees Celsius by ultrasonic spray pyrolysis (Usp) using Di water as solvent and metal chlorides as precursors. The characteristic emission peak of Dy{sup 3+} due to the transitions {sup 4}F{sub 9/2} to {sup 6}H{sub 15/2} at 483 nm, {sup 4}F{sub 9/2} to {sup 6}H{sub 13/2} at 573 nm, {sup 4}F{sub 9/2} to {sup 6}H{sub 11/2} at 667 nm and {sup 4}F{sub 9/2} to {sup 6}H{sub 9/2} at 766 nm were observed. Scanning electron microscopy and transmission electron microscopy measurements were carried out to understand surface morphological features and the particle size of the phosphor. The uniformity of phase of Dy{sup 3+} - Li{sup +} doped Y{sub 2}O{sub 3} phosphors was checked by X-ray diffraction technique. The phosphors form clusters that were found to be ∼ 1 μm in size, however, particles that form these clusters have sizes between 40 and 120 nm. (Author)

  3. White light generation from Dy3+-doped ZnO-B2O3-P2O5 glasses

    Science.gov (United States)

    Jayasimhadri, M.; Jang, Kiwan; Lee, Ho Sueb; Chen, Baojiu; Yi, Soung-Soo; Jeong, Jung-Hyun

    2009-07-01

    Dysprosium doped ZnO-B2O3-P2O5 (ZBP) glasses were prepared by a conventional melt quenching technique in order to study the luminescent properties and their utility for white light emitting diodes (LEDs). X-ray diffraction spectra revealed the amorphous nature of the glass sample. The present glasses were characterized by infrared and Raman spectra to evaluate the vibrational features of the samples. The emission and excitation spectra were reported for the ZBP glasses. Strong blue (484 nm) and yellow (574 nm) emission bands were observed upon various excitations. These two emissions correspond to the F49/2→H615/2 and F49/2→H613/2 transitions of Dy3+ ions, respectively. Combination of these blue and yellow bands gives white light to the naked eye. First time, it was found that ZnO-B2O3-P2O5 glasses efficiently emit white light under 400 and 454 nm excitations, which are nearly match with the emissions of commercial GaN blue LEDs and InGaN LED, respectively. CIE chromaticity coordinates also calculated for Dy3+: ZBP glasses to evaluate the white light emission.

  4. In situ generated CdS nanostructure induced enhanced photoluminescence from Dy{sup 3+} ions doped dielectric nanocomposites

    Energy Technology Data Exchange (ETDEWEB)

    Dey, Chirantan; Karmakar, Basudeb [Glass Science and Technology Section, Glass Division, CSIR-Central Glass and Ceramic Research Institute, Kolkata (India)

    2017-08-15

    We report CdS nanostructure induced enhanced photoluminescence (PL) from Dy{sup +3}:CdS co-doped dielectric-nanocomposites synthesized by the conventional melt-quench technique. CdS nanocrystals (NCs) were synthesized as in situ within the dielectric medium and their growth was controlled by heat treatment duration. Nanoparticles were investigated with absorption spectroscopy, X-ray diffraction (XRD), transmission electron microscopy (TEM), field emission scanning electron microscopy (FESEM), and Raman spectroscopy. The experimentally obtained sizes of the NCs are found to increase from 5-11 nm to 50-80 nm. Bandgap enhancement for the carrier confinement was found to alter within the range of 0.20-0.38 eV. Phonon confinement effect has been confirmed by blue shifting of Raman peak for CdS NCs at 303 cm{sup -1}. Enhanced highly intense sharp PL peak at 576 nm was detected, and different parameters associated with the PL enhancement including energy transfer from CdS NCs to Dy{sup 3+} ions have been studied. This PL enhancement was steered by varying CdS NC sizes. Enhanced PL of these nanocomposites finds their potential applications as gain medium in the field of solid state lasers. (copyright 2017 WILEY-VCH Verlag GmbH and Co. KGaA, Weinheim)

  5. Surface passivation for CdTe devices

    Energy Technology Data Exchange (ETDEWEB)

    Reese, Matthew O.; Perkins, Craig L.; Burst, James M.; Gessert, Timothy A.; Barnes, Teresa M.; Metzger, Wyatt K.

    2017-08-01

    In one embodiment, a method for surface passivation for CdTe devices is provided. The method includes adjusting a stoichiometry of a surface of a CdTe material layer such that the surface becomes at least one of stoichiometric or Cd-rich; and reconstructing a crystalline lattice at the surface of the CdTe material layer by annealing the adjusted surface.

  6. Inclusive J/$\\psi$ production in pp collisions at $\\sqrt{s}$ = 2.76 TeV

    CERN Document Server

    Abelev, B.; Adamova, D.; Adare, A.M.; Aggarwal, M.M.; Aglieri Rinella, G.; Agocs, A.G.; Agostinelli, A.; Aguilar Salazar, S.; Ahammed, Z.; Masoodi, A.Ahmad; Ahmad, N.; Ahn, S.U.; Akindinov, A.; Aleksandrov, D.; Alessandro, B.; Molina, R.Alfaro; Alici, A.; Alkin, A.; Almaraz Avina, E.; Alme, J.; Alt, T.; Altini, V.; Altinpinar, S.; Altsybeev, I.; Andrei, C.; Andronic, A.; Anguelov, V.; Anielski, J.; Anson, C.; Anticic, T.; Antinori, F.; Antonioli, P.; Aphecetche, L.; Appelshauser, H.; Arbor, N.; Arcelli, S.; Arend, A.; Armesto, N.; Arnaldi, R.; Aronsson, T.; Arsene, I.C.; Arslandok, M.; Asryan, A.; Augustinus, A.; Averbeck, R.; Awes, T.C.; Aysto, J.; Azmi, M.D.; Bach, M.; Badala, A.; Baek, Y.W.; Bailhache, R.; Bala, R.; Ferroli, R.Baldini; Baldisseri, A.; Baldit, A.; Baltasar Dos Santos Pedrosa, F.; Ban, J.; Baral, R.C.; Barbera, R.; Barile, F.; Barnafoldi, G.G.; Barnby, L.S.; Barret, V.; Bartke, J.; Basile, M.; Bastid, N.; Bathen, B.; Batigne, G.; Batyunya, B.; Baumann, C.; Bearden, I.G.; Beck, H.; Belikov, I.; Bellini, F.; Bellwied, R.; Belmont-Moreno, E.; Bencedi, G.; Beole, S.; Berceanu, I.; Bercuci, A.; Berdnikov, Y.; Berenyi, D.; Bergmann, C.; Berzano, D.; Betev, L.; Bhasin, A.; Bhati, A.K.; Bianchi, L.; Bianchi, N.; Bianchin, C.; Bielcik, J.; Bielcikova, J.; Bilandzic, A.; Bjelogrlic, S.; Blanco, F.; Blanco, F.; Blau, D.; Blume, C.; Boccioli, M.; Bock, N.; Bogdanov, A.; Boggild, H.; Bogolyubsky, M.; Boldizsar, L.; Bombara, M.; Book, J.; Borel, H.; Borissov, A.; Bose, S.; Bossu, F.; Botje, M.; Bottger, S.; Boyer, B.; Braidot, E.; Braun-Munzinger, P.; Bregant, M.; Breitner, T.; Browning, T.A.; Broz, M.; Brun, R.; Bruna, E.; Bruno, G.E.; Budnikov, D.; Buesching, H.; Bufalino, S.; Bugaiev, K.; Busch, O.; Buthelezi, Z.; Caballero Orduna, D.; Caffarri, D.; Cai, X.; Caines, H.; Calvo Villar, E.; Camerini, P.; Canoa Roman, V.; Cara Romeo, G.; Carena, W.; Carena, F.; Carlin Filho, N.; Carminati, F.; Carrillo Montoya, C.A.; Casanova Diaz, A.; Castillo Castellanos, J.; Castillo Hernandez, J.F.; Casula, E.A.R.; Catanescu, V.; Cavicchioli, C.; Cepila, J.; Cerello, P.; Chang, B.; Chapeland, S.; Charvet, J.L.; Chattopadhyay, S.; Chattopadhyay, S.; Chawla, I.; Cherney, M.; Cheshkov, C.; Cheynis, B.; Chiavassa, E.; Chibante Barroso, V.; Chinellato, D.D.; Chochula, P.; Chojnacki, M.; Christakoglou, P.; Christensen, C.H.; Christiansen, P.; Chujo, T.; Chung, S.U.; Cicalo, C.; Cifarelli, L.; Cindolo, F.; Cleymans, J.; Coccetti, F.; Colamaria, F.; Colella, D.; Conesa Balbastre, G.; Conesa del Valle, Z.; Constantin, P.; Contin, G.; Contreras, J.G.; Cormier, T.M.; Corrales Morales, Y.; Cortese, P.; Cortes Maldonado, I.; Cosentino, M.R.; Costa, F.; Cotallo, M.E.; Crescio, E.; Crochet, P.; Cruz Alaniz, E.; Cuautle, E.; Cunqueiro, L.; Dainese, A.; Dalsgaard, H.H.; Danu, A.; Das, K.; Das, I.; Das, D.; Dash, A.; Dash, S.; De, S.; de Barros, G.O.V.; De Caro, A.; De Cataldo, G.; de Cuveland, J.; De Falco, A.; De Gruttola, D.; Delagrange, H.; Del Castillo Sanchez, E.; Deloff, A.; Demanov, V.; De Marco, N.; Denes, E.; De Pasquale, S.; Deppman, A.; Erasmo, G.D.; de Rooij, R.; Diaz Corchero, M.A.; Di Bari, D.; Dietel, T.; Di Giglio, C.; Di Liberto, S.; Di Mauro, A.; Di Nezza, P.; Divia, R.; Djuvsland, O.; Dobrin, A.; Dobrowolski, T.; Dominguez, I.; Donigus, B.; Dordic, O.; Driga, O.; Dubey, A.K.; Ducroux, L.; Dupieux, P.; Dutta Majumdar, A.K.; Dutta Majumdar, M.R.; Elia, D.; Emschermann, D.; Engel, H.; Erdal, H.A.; Espagnon, B.; Estienne, M.; Esumi, S.; Evans, D.; Eyyubova, G.; Fabris, D.; Faivre, J.; Falchieri, D.; Fantoni, A.; Fasel, M.; Fearick, R.; Fedunov, A.; Fehlker, D.; Feldkamp, L.; Felea, D.; Feofilov, G.; Fernandez Tellez, A.; Ferreiro, E.G.; Ferretti, A.; Ferretti, R.; Figiel, J.; Figueredo, M.A.S.; Filchagin, S.; Finogeev, D.; Fionda, F.M.; Fiore, E.M.; Floris, M.; Foertsch, S.; Foka, P.; Fokin, S.; Fragiacomo, E.; Fragkiadakis, M.; Frankenfeld, U.; Fuchs, U.; Furget, C.; Fusco Girard, M.; Gaardhoje, J.J.; Gagliardi, M.; Gago, A.; Gallio, M.; Gangadharan, D.R.; Ganoti, P.; Garabatos, C.; Garcia-Solis, E.; Garishvili, I.; Gerhard, J.; Germain, M.; Geuna, C.; Gheata, A.; Gheata, M.; Ghidini, B.; Ghosh, P.; Gianotti, P.; Girard, M.R.; Giubellino, P.; Gladysz-Dziadus, E.; Glassel, P.; Gomez, R.; Gonzalez-Trueba, L.H.; Gonzalez-Zamora, P.; Gorbunov, S.; Goswami, A.; Gotovac, S.; Grabski, V.; Graczykowski, L.K.; Grajcarek, R.; Grelli, A.; Grigoras, A.; Grigoras, C.; Grigoriev, V.; Grigoryan, A.; Grigoryan, S.; Grinyov, B.; Grion, N.; Gros, P.; Grosse-Oetringhaus, J.F.; Grossiord, J.Y.; Grosso, R.; Guber, F.; Guernane, R.; Guerra Gutierrez, C.; Guerzoni, B.; Guilbaud, M.; Gulbrandsen, K.; Gunji, T.; Gupta, A.; Gupta, R.; Gutbrod, H.; Haaland, O.; Hadjidakis, C.; Haiduc, M.; Hamagaki, H.; Hamar, G.; Han, B.H.; Hanratty, L.D.; Hansen, A.; Harmanova, Z.; Harris, J.W.; Hartig, M.; Hasegan, D.; Hatzifotiadou, D.; Hayrapetyan, A.; Heckel, S.T.; Heide, M.; Helstrup, H.; Herghelegiu, A.; Herrera Corral, G.; Herrmann, N.; Hetland, K.F.; Hicks, B.; Hille, P.T.; Hippolyte, B.; Horaguchi, T.; Hori, Y.; Hristov, P.; Hrivnacova, I.; Huang, M.; Huber, S.; Humanic, T.J.; Hwang, D.S.; Ichou, R.; Ilkaev, R.; Ilkiv, I.; Inaba, M.; Incani, E.; Innocenti, G.M.; Innocenti, P.G.; Ippolitov, M.; Irfan, M.; Ivan, C.; Ivanov, V.; Ivanov, A.; Ivanov, M.; Ivanytskyi, O.; Jacholkowski, A.; Jacobs, P.M.; Jancurova, L.; Jang, H.J.; Jangal, S.; Janik, M.A.; Janik, R.; Jayarathna, P.H.S.Y.; Jena, S.; Jimenez Bustamante, R.T.; Jirden, L.; Jones, P.G.; Jung, H.; Jusko, A.; Kaidalov, A.B.; Kakoyan, V.; Kalcher, S.; Kalinak, P.; Kalisky, M.; Kalliokoski, T.; Kalweit, A.; Kanaki, K.; Kang, J.H.; Kaplin, V.; Karasu Uysal, A.; Karavichev, O.; Karavicheva, T.; Karpechev, E.; Kazantsev, A.; Kebschull, U.; Keidel, R.; Khan, M.M.; Khan, S.A.; Khan, P.; Khanzadeev, A.; Kharlov, Y.; Kileng, B.; Kim, M.; Kim, J.S.; Kim, D.J.; Kim, T.; Kim, B.; Kim, S.; Kim, S.H.; Kim, D.W.; Kim, J.H.; Kirsch, S.; Kisel, I.; Kiselev, S.; Kisiel, A.; Klay, J.L.; Klein, J.; Klein-Bosing, C.; Kliemant, M.; Kluge, A.; Knichel, M.L.; Knospe, A.G.; Koch, K.; Kohler, M.K.; Kolojvari, A.; Kondratiev, V.; Kondratyeva, N.; Konevskikh, A.; Korneev, A.; Kottachchi Kankanamge Don, C.; Kour, R.; Kowalski, M.; Kox, S.; Koyithatta Meethaleveedu, G.; Kral, J.; Kralik, I.; Kramer, F.; Kraus, I.; Krawutschke, T.; Krelina, M.; Kretz, M.; Krivda, M.; Krizek, F.; Krus, M.; Kryshen, E.; Krzewicki, M.; Kucheriaev, Y.; Kuhn, C.; Kuijer, P.G.; Kurashvili, P.; Kurepin, A.; Kurepin, A.B.; Kuryakin, A.; Kushpil, S.; Kushpil, V.; Kvaerno, H.; Kweon, M.J.; Kwon, Y.; Ladron de Guevara, P.; Lakomov, I.; Langoy, R.; Lara, C.; Lardeux, A.; La Rocca, P.; Lazzeroni, C.; Lea, R.; Le Bornec, Y.; Lee, S.C.; Lee, K.S.; Lefevre, F.; Lehnert, J.; Leistam, L.; Lenhardt, M.; Lenti, V.; Leon, H.; Leon Monzon, I.; Leon Vargas, H.; Levai, P.; Lien, J.; Lietava, R.; Lindal, S.; Lindenstruth, V.; Lippmann, C.; Lisa, M.A.; Liu, L.; Loenne, P.I.; Loggins, V.R.; Loginov, V.; Lohn, S.; Lohner, D.; Loizides, C.; Loo, K.K.; Lopez, X.; Lopez Torres, E.; Lovhoiden, G.; Lu, X.G.; Luettig, P.; Lunardon, M.; Luo, J.; Luparello, G.; Luquin, L.; Luzzi, C.; Ma, K.; Ma, R.; Madagodahettige-Don, D.M.; Maevskaya, A.; Mager, M.; Mahapatra, D.P.; Maire, A.; Malaev, M.; Maldonado Cervantes, I.; Malinina, L.; Mal'Kevich, D.; Malzacher, P.; Mamonov, A.; Manceau, L.; Mangotra, L.; Manko, V.; Manso, F.; Manzari, V.; Mao, Y.; Marchisone, M.; Mares, J.; Margagliotti, G.V.; Margotti, A.; Marin, A.; Marin Tobon, C.A.; Markert, C.; Martashvili, I.; Martinengo, P.; Martinez, M.I.; Martinez Davalos, A.; Martinez Garcia, G.; Martynov, Y.; Mas, A.; Masciocchi, S.; Masera, M.; Masoni, A.; Massacrier, L.; Mastromarco, M.; Mastroserio, A.; Matthews, Z.L.; Matyja, A.; Mayani, D.; Mayer, C.; Mazer, J.; Mazzoni, M.A.; Meddi, F.; Menchaca-Rocha, A.; Mercado Perez, J.; Meres, M.; Miake, Y.; Milano, L.; Milosevic, J.; Mischke, A.; Mishra, A.N.; Miskowiec, D.; Mitu, C.; Mlynarz, J.; Mohanty, A.K.; Mohanty, B.; Molnar, L.; Montano Zetina, L.; Monteno, M.; Montes, E.; Moon, T.; Morando, M.; Moreira De Godoy, D.A.; Moretto, S.; Morsch, A.; Muccifora, V.; Mudnic, E.; Muhuri, S.; Muller, H.; Munhoz, M.G.; Musa, L.; Musso, A.; Nandi, B.K.; Nania, R.; Nappi, E.; Nattrass, C.; Naumov, N.P.; Navin, S.; Nayak, T.K.; Nazarenko, S.; Nazarov, G.; Nedosekin, A.; Nicassio, M.; Nielsen, B.S.; Niida, T.; Nikolaev, S.; Nikolic, V.; Nikulin, V.; Nikulin, S.; Nilsen, B.S.; Nilsson, M.S.; Noferini, F.; Nomokonov, P.; Nooren, G.; Novitzky, N.; Nyanin, A.; Nyatha, A.; Nygaard, C.; Nystrand, J.; Ochirov, A.; Oeschler, H.; Oh, S.K.; Oh, S.; Oleniacz, J.; Oppedisano, C.; Ortiz Velasquez, A.; Ortona, G.; Oskarsson, A.; Ostrowski, P.; Otwinowski, J.; Ovrebekk, G.; Oyama, K.; Ozawa, K.; Pachmayer, Y.; Pachr, M.; Padilla, F.; Pagano, P.; Paic, G.; Painke, F.; Pajares, C.; Pal, S.K.; Pal, S.; Palaha, A.; Palmeri, A.; Papikyan, V.; Pappalardo, G.S.; Park, W.J.; Passfeld, A.; Pastircak, B.; Patalakha, D.I.; Paticchio, V.; Pavlinov, A.; Pawlak, T.; Peitzmann, T.; Pereira De Oliveira Filho, E.; Peresunko, D.; Perez Lara, C.E.; Perez Lezama, E.; Perini, D.; Perrino, D.; Peryt, W.; Pesci, A.; Peskov, V.; Pestov, Y.; Petracek, V.; Petran, M.; Petris, M.; Petrov, P.; Petrovici, M.; Petta, C.; Piano, S.; Piccotti, A.; Pikna, M.; Pillot, P.; Pinazza, O.; Pinsky, L.; Pitz, N.; Piuz, F.; Piyarathna, D.B.; Ploskon, M.; Pluta, J.; Pocheptsov, T.; Pochybova, S.; Podesta-Lerma, P.L.M.; Poghosyan, M.G.; Polak, K.; Polichtchouk, B.; Pop, A.; Porteboeuf-Houssais, S.; Pospisil, V.; Potukuchi, B.; Prasad, S.K.; Preghenella, R.; Prino, F.; Pruneau, C.A.; Pshenichnov, I.; Puchagin, S.; Puddu, G.; Pujol Teixido, J.; Pulvirenti, A.; Punin, V.; Putis, M.; Putschke, J.; Quercigh, E.; Qvigstad, H.; Rachevski, A.; Rademakers, A.; Radomski, S.; Raiha, T.S.; Rak, J.; Rakotozafindrabe, A.; Ramello, L.; Ramirez Reyes, A.; Raniwala, S.; Raniwala, R.; Rasanen, S.S.; Rascanu, B.T.; Rathee, D.; Read, K.F.; Real, J.S.; Redlich, K.; Reichelt, P.; Reicher, M.; Renfordt, R.; Reolon, A.R.; Reshetin, A.; Rettig, F.; Revol, J.P.; Reygers, K.; Riccati, L.; Ricci, R.A.; Richert, T.; Richter, M.; Riedler, P.; Riegler, W.; Riggi, F.; Rodriguez Cahuantzi, M.; Roed, K.; Rohr, D.; Rohrich, D.; Romita, R.; Ronchetti, F.; Rosnet, P.; Rossegger, S.; Rossi, A.; Roukoutakis, F.; Roy, C.; Roy, P.; Rubio Montero, A.J.; Rui, R.; Ryabinkin, E.; Rybicki, A.; Sadovsky, S.; Safarik, K.; Sahoo, R.; Sahu, P.K.; Saini, J.; Sakaguchi, H.; Sakai, S.; Sakata, D.; Salgado, C.A.; Salzwedel, J.; Sambyal, S.; Samsonov, V.; Sanchez Castro, X.; Sandor, L.; Sandoval, A.; Sano, S.; Sano, M.; Santo, R.; Santoro, R.; Sarkamo, J.; Scapparone, E.; Scarlassara, F.; Scharenberg, R.P.; Schiaua, C.; Schicker, R.; Schmidt, H.R.; Schmidt, C.; Schreiner, S.; Schuchmann, S.; Schukraft, J.; Schutz, Y.; Schwarz, K.; Schweda, K.; Scioli, G.; Scomparin, E.; Scott, P.A.; Scott, R.; Segato, G.; Selyuzhenkov, I.; Senyukov, S.; Seo, J.; Serci, S.; Serradilla, E.; Sevcenco, A.; Sgura, I.; Shabetai, A.; Shabratova, G.; Shahoyan, R.; Sharma, N.; Sharma, S.; Shigaki, K.; Shimomura, M.; Shtejer, K.; Sibiriak, Y.; Siciliano, M.; Sicking, E.; Siddhanta, S.; Siemiarczuk, T.; Silvermyr, D.; Silvestre, c.; Simonetti, G.; Singaraju, R.; Singh, R.; Singha, S.; Sinha, T.; Sinha, B.C.; Sitar, B.; Sitta, M.; Skaali, T.B.; Skjerdal, K.; Smakal, R.; Smirnov, N.; Snellings, R.J.M.; Sogaard, C.; Soltz, R.; Son, H.; Song, M.; Song, J.; Soos, C.; Soramel, F.; Sputowska, I.; Spyropoulou-Stassinaki, M.; Srivastava, B.K.; Stachel, J.; Stan, I.; Stefanek, G.; Stefanini, G.; Steinbeck, T.; Steinpreis, M.; Stenlund, E.; Steyn, G.; Stocco, D.; Stolpovskiy, M.; Strabykin, K.; Strmen, P.; Suaide, A.A.P.; Subieta Vasquez, M.A.; Sugitate, T.; Suire, C.; Sukhorukov, M.; Sultanov, R.; Sumbera, M.; Susa, T.; Szanto de Toledo, A.; Szarka, I.; Szostak, A.; Tagridis, C.; Takahashi, J.; J.Tapia Takaki, D.; Tauro, A.; Tejeda Munoz, G.; Telesca, A.; Terrevoli, C.; Thader, J.; Thomas, D.; Tieulent, R.; Timmins, A.R.; Tlusty, D.; Toia, A.; Torii, H.; Toscano, L.; Tosello, F.; Truesdale, D.; Trzaska, W.H.; Tsuji, T.; Tumkin, A.; Turrisi, R.; Tveter, T.S.; Ulery, J.; Ullaland, K.; Ulrich, J.; Uras, A.; Urban, J.; Urciuoli, G.M.; Usai, G.L.; Vajzer, M.; Vala, M.; Valencia Palomo, L.; Vallero, S.; van der Kolk, N.; Vande Vyvre, P.; van Leeuwen, M.; Vannucci, L.; Vargas, A.; Varma, R.; Vasileiou, M.; Vasiliev, A.; Vechernin, V.; Veldhoen, M.; Venaruzzo, M.; Vercellin, E.; Vergara, S.; Vernekohl, D.C.; Vernet, R.; Verweij, M.; Vickovic, L.; Viesti, G.; Vikhlyantsev, O.; Vilakazi, Z.; Villalobos Baillie, O.; Vinogradov, A.; Vinogradov, Y.; Vinogradov, L.; Virgili, T.; Viyogi, Y.P.; Vodopyanov, A.; Voloshin, S.; Voloshin, K.; Volpe, G.; von Haller, B.; Vranic, D.; Vrlakova, J.; Vulpescu, B.; Vyushin, A.; Wagner, B.; Wagner, V.; Wan, R.; Wang, Y.; Wang, D.; Wang, Y.; Wang, M.; Watanabe, K.; Wessels, J.P.; Westerhoff, U.; Wiechula, J.; Wikne, J.; Wilde, M.; Wilk, G.; Wilk, A.; Williams, M.C.S.; Windelband, B.; Karampatsos, L.Xaplanteris; Yang, H.; Yang, S.; Yasnopolskiy, S.; Yi, J.; Yin, Z.; Yokoyama, H.; Yoo, I.K.; Yoon, J.; Yu, W.; Yuan, X.; Yushmanov, I.; Zach, C.; Zampolli, C.; Zaporozhets, S.; Zarochentsev, A.; Zavada, P.; Zaviyalov, N.; Zbroszczyk, H.; Zelnicek, P.; Zgura, I.S.; Zhalov, M.; Zhang, X.; Zhou, D.; Zhou, Y.; Zhou, F.; Zhu, X.; Zichichi, A.; Zimmermann, A.; Zinovjev, G.; Zoccarato, Y.; Zynovyev, M.

    2012-12-05

    The ALICE Collaboration has measured inclusive J/psi production in pp collisions at a center of mass energy sqrt(s)=2.76 TeV at the LHC. The results presented in this Letter refer to the rapidity ranges |y|<0.9 and 2.5dy for the two rapidity regions under study and, for the forward-y range, d^2sigma_J/psi/dydp_t in the transverse momentum domain 0TeV and with theoretical calculations.

  7. Numerical modeling of incline plate LiBr absorber

    Science.gov (United States)

    Karami, Shahram; Farhanieh, Bijan

    2011-03-01

    Among major components of LiBr-H2O absorption chillers is the absorber, which has a direct effect on the chillier size and whose characteristics have significant effects on the overall efficiency of absorption machines. In this article, heat and mass transfer process in absorption of refrigerant vapor into a lithium bromide solution of water-cooled incline plate absorber in the Reynolds number range of 5 lithium bromide aqueous properties to the temperature and concentration is employed as well as dependence of film thickness to vapor absorption. An analysis for linear distribution of wall temperature condition carries out to investigate the reliability of the present numerical method through comparing with previous investigation. The effect of plate angle on heat and mass transfer parameters is investigated and the results show that absorption mass flux and heat and mass transfer coefficient increase as the angle of the plate increase. The main parameters of absorber design, namely Nusselt and Sherwood numbers, are correlated as a function of Reynolds Number and the plate angle.

  8. Nematocid effects of watercress (Nasturtium officinale R. Br.

    Directory of Open Access Journals (Sweden)

    Helena Zahradníková

    2013-01-01

    Full Text Available The watercress (Nasturtium officinale R. Br. is often grown as a forced leaf vegetable rich in vitamins and minerals. Its specific taste and curative effects result from the presence of mustard glycosides (glucosinolates that may also show nematocidic effects. The aim of this study was to evaluate the effect of watercress eluate and juice on tomato plants inoculated with the northern root-knot nematode (NRKN Meloidogyne hapla. It was found out that after the treatment of plants with solutions derived from watercress the yield of fruit was highly significantly increased. The highest yield increase (by 96 % to 165 % was observed in the variant with the highest concentration of watercress extracts (macerate + 200 ml of juice. Although at lower concentrations of watercress solution the increase in yields was also reduced (by 57–118 %, the difference was still statistically highly significant. The effect of this treatment on the content of vitamin C was similar and the increase was also highly significant and ranged from 24 to 67 %. When evaluating the occurrence of nematodes on roots of tomato plants, the presence of pathogens was equal to zero percent in all treated variants. The treatment with this phyto-solution corroborated not only a nematocidic effect of watercress but also its positive influence on the yield and level of vitamin C in dependence on increasing concentrations of the effective agent. It can be therefore concluded that the watercress solution showed a promoting effect on tomato plants.

  9. Systematic hardness measurements on CsClxBr(1–x) and ...

    Indian Academy of Sciences (India)

    Unknown

    Abstract. Vickers hardness measurements have been made on polycrystalline blanks of CsClxBr(1–x) and single crystals of NH4ClxBr(1–x). The composition dependence of hardness is highly nonlinear in both systems and follows an empirical model that includes a lattice contribution and a disorder contribution.

  10. LaBr3 gamma?ray spectrometers for space applications

    NARCIS (Netherlands)

    Quarati, F.G.A.

    2013-01-01

    LaBr3 has been developed into large volume scintillator detectors within an ESA and TU Delft programme during this thesis work. The programme, which aimed at the space applications of LaBr3, also led to extensive experiments within a collaborative framework which included representatives for all the

  11. Tuning growth cycles of Brassica crops via natural antisense transcripts of BrFLC.

    Science.gov (United States)

    Li, Xiaorong; Zhang, Shaofeng; Bai, Jinjuan; He, Yuke

    2016-03-01

    Several oilseed and vegetable crops of Brassica are biennials that require a prolonged winter cold for flowering, a process called vernalization. FLOWERING LOCUS C (FLC) is a central repressor of flowering. Here, we report that the overexpression of natural antisense transcripts (NATs) of Brassica rapa FLC (BrFLC) greatly shortens plant growth cycles. In rapid-, medium- and slow-cycling crop types, there are four copies of the BrFLC genes, which show extensive variation in sequences and expression levels. In Bre, a biennial crop type that requires vernalization, five NATs derived from the BrFLC2 locus are rapidly induced under cold conditions, while all four BrFLC genes are gradually down-regulated. The transgenic Bre lines overexpressing a long NAT of BrFLC2 do not require vernalization, resulting in a gradient of shortened growth cycles. Among them, a subset of lines both flower and set seeds as early as Yellow sarson, an annual crop type in which all four BrFLC genes have non-sense mutations and are nonfunctional in flowering repression. Our results demonstrate that the growth cycles of biennial crops of Brassica can be altered by changing the expression levels of BrFLC2 NATs. Thus, BrFLC2 NATs and their transgenic lines are useful for the genetic manipulation of crop growth cycles. © 2015 Society for Experimental Biology, Association of Applied Biologists and John Wiley & Sons Ltd.

  12. Synthesis and characterization of cationic selenium-nitrogen heterocycles from tert-butyl-DAB (DAB = 1,4-di-tert-butyl-1,3-diazabutadiene) and SeX4 via the reductive elimination of X2 (X = Cl, Br): a distinct contrast with tellurium.

    Science.gov (United States)

    Dutton, Jason L; Sutrisno, Andre; Schurko, Robert W; Ragogna, Paul J

    2008-07-14

    The synthesis and comprehensive characterisation of a series of 1,2,5-selenadiazolium salts, which were generated from the direct reaction between the neutral bidentate ligand tert-butyl-DAB and a variety of heavy chalcogen halides, are reported. The formation of the cationic heterocycle from the reaction of SeX4 (X = Cl, Br) and the ligand results in a two electron redox process where the chalcogen undergoes a two electron reduction concomitant with the elimination of X2, the oxidation by-product. A reaction pathway for this chemistry has been proposed necessitating several key intermediates. These species have been synthesized and used in a stepwise series of transformations that strongly supports this very unusual reactivity for the chalcogens. In contrast, the reaction between tert-butyl DAB and TeX4 (X = Cl, Br, I), does not result in redox, rather an octahedral Te(iv) x DAB complex is formed or no reaction was observed.

  13. MOVPE deposition of Sb2Te3 and other phases of Sb-Te system on sapphire substrate

    Science.gov (United States)

    Kuznetsov, P. I.; Shchamkhalova, B. S.; Yapaskurt, V. O.; Shcherbakov, V. D.; Luzanov, V. A.; Yakushcheva, G. G.; Jitov, V. A.; Sizov, V. E.

    2017-08-01

    The films of Sb-Te system have been deposited by MOVPE on (0 0 0 1) Al2O3 substrates with thin ZnTe buffer layers at different temperatures and Te/Sb ratios in the vapor phase. X-ray diffractometry, SEM microscopy, Raman and EDX spectroscopy were used to study as-grown films. The surface morphology and stoichiometry of Sb-Te films strongly depend on Te/Sb ratio in vapor phase. We have deposited the phases of homologous series nSb2·mSb2Te3 with following stoichiometries: Sb2Te3, Sb4Te5, Sb8Te9, Sb10Te9, Sb4Te3, Sb2Te, Sb8Te3, Sb10Te3, Sb16Te3, Sb18Te3 and Sb. Transport properties of Sb2Te3, Sb4Te5, Sb8Te9, Sb4Te3, Sb2Te were evaluated using Van der Pauw technique at 300 K.

  14. Gamma spectrometric characterization of various CdTe and CdZnTe detectors

    CERN Document Server

    Arlt, R; Sumah, P

    1999-01-01

    CdZnTe and CdTe detectors are now used by the Department of Safeguards of the International Atomic Energy Agency in significant numbers. To prepare, plan and support various verification methods, their properties must be well characterized and understood. In this paper we present some of the results which were obtained with large volume hemispheric CdZnTe detectors and high-resolution CdTe detectors.

  15. Characterization of soluble bromide measurements and a case study of BrO observations during ARCTAS

    Directory of Open Access Journals (Sweden)

    J. Liao

    2012-02-01

    Full Text Available A focus of the Arctic Research of the Composition of the Troposphere from Aircraft and Satellites (ARCTAS mission was examination of bromine photochemistry in the spring time high latitude troposphere based on aircraft and satellite measurements of bromine oxide (BrO and related species. The NASA DC-8 aircraft utilized a chemical ionization mass spectrometer (CIMS to measure BrO and a mist chamber (MC to measure soluble bromide. We have determined that the MC detection efficiency to molecular bromine (Br2, hypobromous acid (HOBr, bromine oxide (BrO, and hydrogen bromide (HBr as soluble bromide (Br was 0.9±0.1, 1.06+0.30/−0.35, 0.4±0.1, and 0.95±0.1, respectively. These efficiency factors were used to estimate soluble bromide levels along the DC-8 flight track of 17 April 2008 from photochemical calculations constrained to in situ BrO measured by CIMS. During this flight, the highest levels of soluble bromide and BrO were observed and atmospheric conditions were ideal for the space-borne observation of BrO. The good agreement (R2 = 0.76; slope = 0.95; intercept = −3.4 pmol mol−1 between modeled and observed soluble bromide, when BrO was above detection limit (>2 pmol mol−1 under unpolluted conditions (NO<10 pmol mol−1, indicates that the CIMS BrO measurements were consistent with the MC soluble bromide and that a well characterized MC can be used to derive mixing ratios of some reactive bromine compounds. Tropospheric BrO vertical column densities (BrOVCD derived from CIMS BrO observations compare well with BrOTROPVCD from OMI on 17 April 2008.

  16. X-ray imaging plate using CsBr:Eu phosphors for computed radiography

    Science.gov (United States)

    Nanto, H.; Nishimura, A.; Kuroda, M.; Takei, Y.; Nakano, Y.; Shoji, T.; Yanagita, T.; Kasai, S.

    2007-09-01

    It is shown that X-ray-irradiated Eu-doped CsBr (CsBr:Eu) exhibits intense photostimulated luminescence (PSL). The peak wavelengths of PSL emission and stimulation spectra of CsBr:Eu phosphor ceramic samples are 450 and 690 nm, respectively. The dependence of PSL properties on preparing conditions of phosphor ceramic samples, such as Eu concentration, sintering temperature and sintering time, is studied. It is found that the PSL intensity of CsBr:Eu phosphor ceramics fabricated under optimum preparation condition is higher than that of commercially available imaging plates (IP) using BaFBr:Eu and BaFI:Eu. The image quality of the IP using CsBr:Eu phosphor film is better than that of commercially available IP.

  17. The carcinogenicity of 1-methyl-3(p-bromophenyl)-1-nitrosourea (Br-MPNU).

    Science.gov (United States)

    Warzok, R; Martin, J; Mendel, J; Thust, R; Schwarz, H

    1983-01-01

    In long-term experiments with Hooded rats the carcinogenic potential of 1-methyl-3(p-bromophenyl)-1-nitrosourea (Br-MPNU) could be demonstrated for the first time. Br-MPNU is formed also endogenously after combined administration of 1-methyl-3(p-bromophenyl)-urea (Br-MPU) and sodium nitrite. After repeated intragastric administration of 0.33 mmol Br-MPU and 0.73 mmol NaNO2 per kg b.w. papillomas and carcinomas of the forestomach developed in 83%. After repeated administration of 0.28 mmol Br-MPNU per kg b.w. these neoplasms were observed in 88%. The comparison of results obtained in similar experiments with 1-methyl-3-phenyl-1-nitrosourea shows that bromine substitution led to a reduction of the carcinogenic activity. The present paper is part of a complex program studying the interrelationships between structure, physico-chemical properties, mutagenicity and carcinogenicity of nitrosoureas.

  18. Light vector meson production in pp collisions at $\\sqrt{s}$ = 7 TeV

    CERN Document Server

    Abelev, B.; Adamova, D.; Adare, A.M.; Aggarwal, M.M.; Aglieri Rinella, G.; Agocs, A.G.; Agostinelli, A.; Aguilar Salazar, S.; Ahammed, Z.; Ahmad, N.; Ahmad Masoodi, A.; Ahn, S.U.; Akindinov, A.; Aleksandrov, D.; Alessandro, B.; Alfaro Molina, R.; Alici, A.; Alkin, A.; Almaraz Avina, E.; Alt, T.; Altini, V.; Altinpinar, S.; Altsybeev, I.; Andrei, C.; Andronic, A.; Anguelov, V.; Anson, C.; Anticic, T.; Antinori, F.; Antonioli, P.; Aphecetche, L.; Appelshauser, H.; Arbor, N.; Arcelli, S.; Arend, A.; Armesto, N.; Arnaldi, R.; Aronsson, T.; Arsene, I.C.; Arslandok, M.; Asryan, A.; Augustinus, A.; Averbeck, R.; Awes, T.C.; Aysto, J.; Azmi, M.D.; Bach, M.; Badala, A.; Baek, Y.W.; Bailhache, R.; Bala, R.; Baldini Ferroli, R.; Baldisseri, A.; Baldit, A.; Baltasar Dos Santos Pedrosa, F.; Ban, J.; Baral, R.C.; Barbera, R.; Barile, F.; Barnafoldi, G.G.; Barnby, L.S.; Barret, V.; Bartke, J.; Basile, M.; Bastid, N.; Bathen, B.; Batigne, G.; Batyunya, B.; Baumann, C.; Bearden, I.G.; Beck, H.; Belikov, I.; Bellini, F.; Bellwied, R.; Belmont-Moreno, E.; Beole, S.; Berceanu, I.; Bercuci, A.; Berdnikov, Y.; Berenyi, D.; Bergmann, C.; Berzano, D.; Betev, L.; Bhasin, A.; Bhati, A.K.; Bianchi, L.; Bianchi, N.; Bianchin, C.; Bielcik, J.; Bielcikova, J.; Bilandzic, A.; Blanco, F.; Blau, D.; Blume, C.; Boccioli, M.; Bock, N.; Bogdanov, A.; Boggild, H.; Bogolyubsky, M.; Boldizsar, L.; Bombara, M.; Book, J.; Borel, H.; Borissov, A.; Bortolin, C.; Bose, S.; Bossu, F.; Botje, M.; Bottger, S.; Boyer, B.; Braun-Munzinger, P.; Bregant, M.; Breitner, T.; Broz, M.; Brun, R.; Bruna, E.; Bruno, G.E.; Budnikov, D.; Buesching, H.; Bufalino, S.; Bugaiev, K.; Busch, O.; Buthelezi, Z.; Caffarri, D.; Cai, X.; Caines, H.; Calvo Villar, E.; Camerini, P.; Canoa Roman, V.; Cara Romeo, G.; Carena, W.; Carena, F.; Carlin Filho, N.; Carminati, F.; Carrillo Montoya, C.A.; Casanova Diaz, A.; Caselle, M.; Castillo Castellanos, J.; Castillo Hernandez, J.F.; Casula, E.A.R.; Catanescu, V.; Cavicchioli, C.; Cepila, J.; Cerello, P.; Chang, B.; Chapeland, S.; Charvet, J.L.; Chattopadhyay, S.; Cherney, M.; Cheshkov, C.; Cheynis, B.; Chiavassa, E.; Chibante Barroso, V.; Chinellato, D.D.; Chochula, P.; Chojnacki, M.; Christakoglou, P.; Christensen, C.H.; Christiansen, P.; Chujo, T.; Chung, S.U.; Cicalo, C.; Cifarelli, L.; Cindolo, F.; Cleymans, J.; Coccetti, F.; Coffin, J.P.; Colamaria, F.; Colella, D.; Conesa Balbastre, G.; Conesa del Valle, Z.; Constantin, P.; Contin, G.; Contreras, J.G.; Cormier, T.M.; Corrales Morales, Y.; Cortese, P.; Cortes Maldonado, I.; Cosentino, M.R.; Costa, F.; Cotallo, M.E.; Crescio, E.; Crochet, P.; Alaniz, E.Cruz; Cuautle, E.; Cunqueiro, L.; Dainese, A.; Dalsgaard, H.H.; Danu, A.; Das, K.; Das, D.; Das, I.; Dash, S.; Dash, A.; De, S.; De Azevedo Moregula, A.; de Barros, G.O.V.; De Caro, A.; de Cataldo, G.; de Cuveland, J.; De Falco, A.; De Gruttola, D.; Delagrange, H.; Del Castillo Sanchez, E.; Deloff, A.; Demanov, V.; De Marco, N.; Denes, E.; De Pasquale, S.; Deppman, A.; Erasmo, G.D; de Rooij, R.; Di Bari, D.; Dietel, T.; Di Giglio, C.; Di Liberto, S.; Di Mauro, A.; Di Nezza, P.; Divia, R.; Djuvsland, O.; Dobrin, A.; Dobrowolski, T.; Dominguez, I.; Donigus, B.; Dordic, O.; Driga, O.; Dubey, A.K.; Ducroux, L.; Dupieux, P.; Dutta Majumdar, A.K.; Dutta Majumdar, M.R.; Elia, D.; Emschermann, D.; Engel, H.; Erdal, H.A.; Espagnon, B.; Estienne, M.; Esumi, S.; Evans, D.; Eyyubova, G.; Fabris, D.; Faivre, J.; Falchieri, D.; Fantoni, A.; Fasel, M.; Fearick, R.; Fedunov, A.; Fehlker, D.; Feldkamp, L.; Felea, D.; Feofilov, G.; Fernandez Tellez, A.; Ferretti, A.; Ferretti, R.; Figiel, J.; Figueredo, M.A.S.; Filchagin, S.; Fini, R.; Finogeev, D.; Fionda, F.M.; Fiore, E.M.; Floris, M.; Foertsch, S.; Foka, P.; Fokin, S.; Fragiacomo, E.; Fragkiadakis, M.; Frankenfeld, U.; Fuchs, U.; Furget, C.; Fusco Girard, M.; Gaardhoje, J.J.; Gagliardi, M.; Gago, A.; Gallio, M.; Gangadharan, D.R.; Ganoti, P.; Garabatos, C.; Garcia-Solis, E.; Garishvili, I.; Gerhard, J.; Germain, M.; Geuna, C.; Gheata, M.; Gheata, A.; Ghidini, B.; Ghosh, P.; Gianotti, P.; Girard, M.R.; Giubellino, P.; Gladysz-Dziadus, E.; Glassel, P.; Gomez, R.; Ferreiro, E.G.; Gonzalez-Trueba, L.H.; Gonzalez-Zamora, P.; Gorbunov, S.; Goswami, A.; Gotovac, S.; Grabski, V.; Graczykowski, L.K.; Grajcarek, R.; Grelli, A.; Grigoras, C.; Grigoras, A.; Grigoriev, V.; Grigoryan, A.; Grigoryan, S.; Grinyov, B.; Grion, N.; Gros, P.; Grosse-Oetringhaus, J.F.; Grossiord, J.Y.; Grosso, R.; Guber, F.; Guernane, R.; Guerra Gutierrez, C.; Guerzoni, B.; Guilbaud, M.; Gulbrandsen, K.; Gunji, T.; Gupta, A.; Gupta, R.; Gutbrod, H.; Haaland, O.; Hadjidakis, C.; Haiduc, M.; Hamagaki, H.; Hamar, G.; Han, B.H.; Hanratty, L.D.; Hansen, A.; Harmanova, Z.; Harris, J.W.; Hartig, M.; Hasegan, D.; Hatzifotiadou, D.; Hayrapetyan, A.; Heide, M.; Helstrup, H.; Herghelegiu, A.; Herrera Corral, G.; Herrmann, N.; Hetland, K.F.; Hicks, B.; Hille, P.T.; Hippolyte, B.; Horaguchi, T.; Hori, Y.; Hristov, P.; Hrivnacova, I.; Huang, M.; Huber, S.; Humanic, T.J.; Hwang, D.S.; Ichou, R.; Ilkaev, R.; Ilkiv, I.; Inaba, M.; Incani, E.; Innocenti, G.M.; Innocenti, P.G.; Ippolitov, M.; Irfan, M.; Ivan, C.; Ivanov, M.; Ivanov, A.; Ivanov, V.; Ivanytskyi, O.; Jacholkowski, A.; Jacobs, P.M.; Jancurova, L.; Jang, H.J.; Jangal, S.; Janik, R.; Janik, M.A.; Jayarathna, P.H.S.Y.; Jena, S.; Jimenez Bustamante, R.T.; Jirden, L.; Jones, P.G.; Jung, W.; Jung, H.; Jusko, A.; Kaidalov, A.B.; Kakoyan, V.; Kalcher, S.; Kalinak, P.; Kalisky, M.; Kalliokoski, T.; Kalweit, A.; Kanaki, K.; Kang, J.H.; Kaplin, V.; Karasu Uysal, A.; Karavichev, O.; Karavicheva, T.; Karpechev, E.; Kazantsev, A.; Kebschull, U.; Keidel, R.; Khan, M.M.; Khan, P.; Khan, S.A.; Khanzadeev, A.; Kharlov, Y.; Kileng, B.; Kim, D.W.; Kim, M.; Kim, J.H.; Kim, S.H.; Kim, S.; Kim, B.; Kim, T.; Kim, D.J.; Kim, J.S.; Kirsch, S.; Kisel, I.; Kiselev, S.; Kisiel, A.; Klay, J.L.; Klein, J.; Klein-Bosing, C.; Kliemant, M.; Kluge, A.; Knichel, M.L.; Koch, K.; Kohler, M.K.; Kolojvari, A.; Kondratiev, V.; Kondratyeva, N.; Konevskikh, A.; Korneev, A.; Kottachchi Kankanamge Don, C.; Kour, R.; Kowalski, M.; Kox, S.; Koyithatta Meethaleveedu, G.; Kral, J.; Kralik, I.; Kramer, F.; Kraus, I.; Krawutschke, T.; Kretz, M.; Krivda, M.; Krizek, F.; Krus, M.; Kryshen, E.; Krzewicki, M.; Kucheriaev, Y.; Kuhn, C.; Kuijer, P.G.; Kurashvili, P.; Kurepin, A.B.; Kurepin, A.; Kuryakin, A.; Kushpil, V.; Kushpil, S.; Kvaerno, H.; Kweon, M.J.; Kwon, Y.; Ladron de Guevara, P.; Lakomov, I.; Langoy, R.; Lara, C.; Lardeux, A.; La Rocca, P.; Lazzeroni, C.; Lea, R.; Le Bornec, Y.; Lee, K.S.; Lee, S.C.; Lefevre, F.; Lehnert, J.; Leistam, L.; Lenhardt, M.; Lenti, V.; Leon, H.; Leon Monzon, I.; Leon Vargas, H.; Levai, P.; Li, X.; Lien, J.; Lietava, R.; Lindal, S.; Lindenstruth, V.; Lippmann, C.; Lisa, M.A.; Liu, L.; Loenne, P.I.; Loggins, V.R.; Loginov, V.; Lohn, S.; Lohner, D.; Loizides, C.; Loo, K.K.; Lopez, X.; Lopez Torres, E.; Lovhoiden, G.; Lu, X.G.; Luettig, P.; Lunardon, M.; Luo, J.; Luparello, G.; Luquin, L.; Luzzi, C.; Ma, R.; Ma, K.; Madagodahettige-Don, D.M.; Maevskaya, A.; Mager, M.; Mahapatra, D.P.; Maire, A.; Malaev, M.; Maldonado Cervantes, I.; Malinina, L.; Mal'Kevich, D.; Malzacher, P.; Mamonov, A.; Manceau, L.; Mangotra, L.; Manko, V.; Manso, F.; Manzari, V.; Mao, Y.; Marchisone, M.; Mares, J.; Margagliotti, G.V.; Margotti, A.; Marin, A.; Markert, C.; Martashvili, I.; Martinengo, P.; Martinez, M.I.; Martinez Davalos, A.; Martinez Garcia, G.; Martynov, Y.; Mas, A.; Masciocchi, S.; Masera, M.; Masoni, A.; Massacrier, L.; Mastromarco, M.; Mastroserio, A.; Matthews, Z.L.; Matyja, A.; Mayani, D.; Mayer, C.; Mazer, J.; Mazzoni, M.A.; Meddi, F.; Menchaca-Rocha, A.; Mercado Perez, J.; Meres, M.; Miake, Y.; Michalon, A.; Midori, J.; Milano, L.; Milosevic, J.; Mischke, A.; Mishra, A.N.; Miskowiec, D.; Mitu, C.; Mlynarz, J.; Mohanty, A.K.; Mohanty, B.; Molnar, L.; Montano Zetina, L.; Monteno, M.; Montes, E.; Moon, T.; Morando, M.; Moreira De Godoy, D.A.; Moretto, S.; Morsch, A.; Muccifora, V.; Mudnic, E.; Muhuri, S.; Muller, H.; Munhoz, M.G.; Musa, L.; Musso, A.; Nandi, B.K.; Nania, R.; Nappi, E.; Nattrass, C.; Naumov, N.P.; Navin, S.; Nayak, T.K.; Nazarenko, S.; Nazarov, G.; Nedosekin, A.; Nicassio, M.; Nielsen, B.S.; Niida, T.; Nikolaev, S.; Nikolic, V.; Nikulin, S.; Nikulin, V.; Nilsen, B.S.; Nilsson, M.S.; Noferini, F.; Nomokonov, P.; Nooren, G.; Novitzky, N.; Nyanin, A.; Nyatha, A.; Nygaard, C.; Nystrand, J.; Obayashi, H.; Ochirov, A.; Oeschler, H.; Oh, S.K.; Oh, S.; Oleniacz, J.; Oppedisano, C.; Ortiz Velasquez, A.; Ortona, G.; Oskarsson, A.; Ostrowski, P.; Otterlund, I.; Otwinowski, J.; Oyama, K.; Ozawa, K.; Pachmayer, Y.; Pachr, M.; Padilla, F.; Pagano, P.; Paic, G.; Painke, F.; Pajares, C.; Pal, S.; Pal, S.K.; Palaha, A.; Palmeri, A.; Papikyan, V.; Pappalardo, G.S.; Park, W.J.; Passfeld, A.; Pastircak, B.; Patalakha, D.I.; Paticchio, V.; Pavlinov, A.; Pawlak, T.; Peitzmann, T.; Perales, M.; Pereira De Oliveira Filho, E.; Peresunko, D.; Perez Lara, C.E.; Perez Lezama, E.; Perini, D.; Perrino, D.; Peryt, W.; Pesci, A.; Peskov, V.; Pestov, Y.; Petracek, V.; Petran, M.; Petris, M.; Petrov, P.; Petrovici, M.; Petta, C.; Piano, S.; Piccotti, A.; Pikna, M.; Pillot, P.; Pinazza, O.; Pinsky, L.; Pitz, N.; Piuz, F.; Piyarathna, D.B.; Ploskon, M.; Pluta, J.; Pocheptsov, T.; Pochybova, S.; Podesta-Lerma, P.L.M.; Poghosyan, M.G.; Polak, K.; Polichtchouk, B.; Pop, A.; Porteboeuf-Houssais, S.; Pospisil, V.; Potukuchi, B.; Prasad, S.K.; Preghenella, R.; Prino, F.; Pruneau, C.A.; Pshenichnov, I.; Puchagin, S.; Puddu, G.; Pulvirenti, A.; Punin, V.; Putis, M.; Putschke, J.; Quercigh, E.; Qvigstad, H.; Rachevski, A.; Rademakers, A.; Radomski, S.; Raiha, T.S.; Rak, J.; Rakotozafindrabe, A.; Ramello, L.; Ramirez Reyes, A.; Raniwala, R.; Raniwala, S.; Rasanen, S.S.; Rascanu, B.T.; Rathee, D.; Read, K.F.; Real, J.S.; Redlich, K.; Reichelt, P.; Reicher, M.; Renfordt, R.; Reolon, A.R.; Reshetin, A.; Rettig, F.; Revol, J.P.; Reygers, K.; Riccati, L.; Ricci, R.A.; Richter, M.; Riedler, P.; Riegler, W.; Riggi, F.; Rodriguez Cahuantzi, M.; Rohr, D.; Rohrich, D.; Romita, R.; Ronchetti, F.; Rosnet, P.; Rossegger, S.; Rossi, A.; Roukoutakis, F.; Roy, C.; Roy, P.; Rubio Montero, A.J.; Rui, R.; Ryabinkin, E.; Rybicki, A.; Sadovsky, S.; Safarik, K.; Sahu, P.K.; Saini, J.; Sakaguchi, H.; Sakai, S.; Sakata, D.; Salgado, C.A.; Sambyal, S.; Samsonov, V.; Sanchez Castro, X.; Sandor, L.; Sandoval, A.; Sano, M.; Sano, S.; Santo, R.; Santoro, R.; Sarkamo, J.; Scapparone, E.; Scarlassara, F.; Scharenberg, R.P.; Schiaua, C.; Schicker, R.; Schmidt, C.; Schmidt, H.R.; Schreiner, S.; Schuchmann, S.; Schukraft, J.; Schutz, Y.; Schwarz, K.; Schweda, K.; Scioli, G.; Scomparin, E.; Scott, P.A.; Scott, R.; Segato, G.; Selyuzhenkov, I.; Senyukov, S.; Seo, J.; Serci, S.; Serradilla, E.; Sevcenco, A.; Sgura, I.; Shabetai, A.; Shabratova, G.; Shahoyan, R.; Sharma, N.; Sharma, S.; Shigaki, K.; Shimomura, M.; Shtejer, K.; Sibiriak, Y.; Siciliano, M.; Sicking, E.; Siddhanta, S.; Siemiarczuk, T.; Silvermyr, D.; Simonetti, G.; Singaraju, R.; Singh, R.; Singha, S.; Sinha, B.C.; Sinha, T.; Sitar, B.; Sitta, M.; Skaali, T.B.; Skjerdal, K.; Smakal, R.; Smirnov, N.; Snellings, R.; Sogaard, C.; Soltz, R.; Son, H.; Song, M.; Song, J.; Soos, C.; Soramel, F.; Sputowska, I.; Spyropoulou-Stassinaki, M.; Srivastava, B.K.; Stachel, J.; Stan, I.; Stefanek, G.; Stefanini, G.; Steinbeck, T.; Steinpreis, M.; Stenlund, E.; Steyn, G.; Stocco, D.; Stolpovskiy, M.; Strabykin, K.; Strmen, P.; Suaide, A.A.P.; Subieta Vasquez, M.A.; Sugitate, T.; Suire, C.; Sukhorukov, M.; Sultanov, R.; Sumbera, M.; Susa, T.; de Toledo, A.Szanto; Szarka, I.; Szostak, A.; Tagridis, C.; Takahashi, J.; Takaki, J.D.Tapia; Tauro, A.; Tejeda Munoz, G.; Telesca, A.; Terrevoli, C.; Thader, J.; Thomas, D.; Thomas, J.H.; Tieulent, R.; Timmins, A.R.; Tlusty, D.; Toia, A.; Torii, H.; Toscano, L.; Tosello, F.; Traczyk, T.; Truesdale, D.; Trzaska, W.H.; Tsuji, T.; Tumkin, A.; Turrisi, R.; Tveter, T.S.; Ulery, J.; Ullaland, K.; Ulrich, J.; Uras, A.; Urban, J.; Urciuoli, G.M.; Usai, G.L.; 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Zavada, P.; Zaviyalov, N.; Zbroszczyk, H.; Zelnicek, P.; Zgura, I.; Zhalov, M.; Zhang, X.; Zhou, D.; Zhou, Y.; Zhou, F.; Zhu, X.; Zichichi, A.; Zimmermann, A.; Zinovjev, G.; Zoccarato, Y.; Zynovyev, M.

    2013-07-16

    The ALICE experiment has measured low-mass dimuon production in pp collisions at $\\sqrt{s}$ = 7 TeV in the dimuon rapidity region 2.5dy dp_t$ are extracted as a function of $p_t$ for $\\omega$ and $\\phi$. The ratio between the $\\rho$ and $\\omega$ cross section is obtained. Results for the $\\phi$ are compared with other measurements at the same energy and with predictions by models.

  19. Designing Diameter-Modulated Heterostructure Nanowires of PbTe/Te by Controlled Dewetting.

    Science.gov (United States)

    Kumar, Abinash; Kundu, Subhajit; Samantaray, Debadarshini; Kundu, Paromita; Zanaga, Daniele; Bals, Sara; Ravishankar, N

    2017-12-13

    Heterostructures consisting of semiconductors with controlled morphology and interfaces find applications in many fields. A range of axial, radial, and diameter-modulated nanostructures have been synthesized primarily using vapor phase methods. Here, we present a simple wet chemical routine to synthesize heterostructures of PbTe/Te using Te nanowires as templates. A morphology evolution study for the formation of these heterostructures has been performed. On the basis of these control experiments, a pathway for the formation of these nanostructures is proposed. Reduction of a Pb precursor to Pb on Te nanowire templates followed by interdiffusion of Pb/Te leads to the formation of a thin shell of PbTe on the Te wires. Controlled dewetting of the thin shell leads to the formation of cube-shaped PbTe that is periodically arranged on the Te wires. Using control experiments, we show that different reactions parameters like rate of addition of the reducing agent, concentration of Pb precursor and thickness of initial Te nanowire play a critical role in controlling the spacing between the PbTe cubes on the Te wires. Using simple surface energy arguments, we propose a mechanism for the formation of the hybrid. The principles presented are general and can be exploited for the synthesis of other nanoscale heterostructures.

  20. Lattice dynamical properties of MnTe, HgTe and their mixed ...

    Indian Academy of Sciences (India)

    this phase. The solid solution of HgTe and MnTe form ternary mixed crystal MnxHg1−xTe which belongs to a group of materi- als known as semimagnetic semiconductors. These crystals are narrow-gap semiconductors with a variable energy gap, which depends on composition x and which can be either positive or zero.