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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

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    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. Time-resolved Fermi surface mapping of the charge density wave material DyTe3

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    Wolf M.

    2013-03-01

    Full Text Available The femtosecond dynamics of the Fermi surface of DyTe3 and its band structure are investigated by time- and angle-resolved photoemission spectroscopy. We directly monitor the ultrafast collapse of the charge density wave gap within 200 fs.

  4. Crystal structure of the RAgTe{sub 2} (R=Y, Tb, Dy, Ho and Er) compounds

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    Gulay, L.D. [Department of General and Inorganic Chemistry, Volyn State University, Voli Avenue 13, 43009 Lutsk (Ukraine)]. E-mail: gulay@univer.lutsk.ua; Olekseyuk, I.D. [Department of General and Inorganic Chemistry, Volyn State University, Voli Avenue 13, 43009 Lutsk (Ukraine); Pietraszko, A. [W. Trzebiatowski Institute of Low Temperature and Structure Research, Polish Academy of Sciences, Okolna Street 2, P.O. Box 1410, 50-950 Wroclaw (Poland)

    2006-11-09

    The crystal structures of the RAgTe{sub 2} (R=Y, Tb, Dy, Ho and Er) compounds (space group P4-bar 2{sub 1}m, Pearson symbol tP8) were determined by means of X-ray powder diffraction: a=0.71398(2)nm, c=0.45947(2)nm, R{sub I}=0.0701 (YAgTe{sub 2}), a=0.71466(3)nm, c=0.46108(3)nm, R{sub I}=0.0761 (TbAgTe{sub 2}), a=0.71287(3)nm, c=0.45955(3)nm, R{sub I}=0.0637 (DyAgTe{sub 2}), a=0.71033(3)nm, c=0.45713(3)nm, R{sub I}=0.0755 (HoAgTe{sub 2}) and X-ray single crystal diffraction: a=0.7091(1)nm, c=0.45650(9)nm, R{sub 1}=0.0366 (ErAgTe{sub 2}). The Te atoms in the structure of the RAgTe{sub 2} compounds are stacked in a close-packed arrangement with layers in the sequence AB. Half of the octahedral interstices are occupied by the R atoms. The Ag atoms are located in remaining octahedral interstices, but they are shifted from the centers of the respective octahedra and tetrahedral surrounding really exists for Ag.

  5. Investigation of the R{sub 2}Te{sub 3}-M{sub 2}Te-PbTe (R = Tb, Dy; M = Cu, Ag) systems at 770 K

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    Marchuk, O.V. [Department of Physical and Colloidal Chemistry, Volyn State University, Voli Ave 13, 43009 Lutsk (Ukraine); Daszkiewicz, M. [W. Trzebiatowski Institute of Low Temperature and Structure Research, Polish Academy of Sciences, Okolna str. 2, P.O. Box 1410, 50-950 Wroclaw (Poland); Gulay, L.D. [Department of General and Inorganic Chemistry, Volyn State University, Voli Ave 13, 43009 Lutsk (Ukraine)], E-mail: gulay@lab.univer.lutsk.ua; Olekseyuk, I.D. [Department of General and Inorganic Chemistry, Volyn State University, Voli Ave 13, 43009 Lutsk (Ukraine); Pietraszko, A. [W. Trzebiatowski Institute of Low Temperature and Structure Research, Polish Academy of Sciences, Okolna str. 2, P.O. Box 1410, 50-950 Wroclaw (Poland)

    2008-05-08

    The interactions between the components in the R{sub 2}Te{sub 3}-M{sub 2}Te-PbTe (R Tb, Dy; M = Cu, Ag) systems at 770 K were determined using X-ray powder diffraction. The formation of the compounds R{sub 7}Cu{sub 3}Te{sub 12} (Ho{sub 7}Cu{sub 3}Te{sub 12} structure type, space group R3-barm), RCu{sub 5}Te{sub 4} (unknown structure), RAgTe{sub 2} (ErAgTe{sub 2} structure type, space group P4-bar2{sub 1}m) and the solid solutions R{sub (2+x)/3}Cu{sub 2-x}Te{sub 2} (0 {<=} x {<=} 1) (Er{sub 2/3}Cu{sub 2}S{sub 2} structure type, space group P3-bar) in the R{sub 2}Te{sub 3}-M{sub 2}Te sections was observed. No compounds exist in the R{sub 2}Te{sub 3}-PbTe and M{sub 2}Te-PbTe sections. The formation of quaternary compounds was not observed in the investigated systems.

  6. Recent advances in Tl Br, Cd Te and CdZnTe semiconductor radiation detectors: a review

    Energy Technology Data Exchange (ETDEWEB)

    Oliveira, Icimone B. [Universidade Bandeirante (UNIBAN), Sao Paulo, SP (Brazil)

    2011-07-01

    The success in the development of radiation spectrometers operating at room temperature is based on many years of effort on the part of large numbers of workers around the world. These individuals have contributed to the understanding of the fundamental materials issues associated with the growth of semiconductors for this application, the development of device fabrication and processing technology, and advances in low noise electronics and pulse processing. Progress in this field continues at an accelerated pace, as in evidenced by the improvements in detector performance and by the growing number of commercial products. Thus, the last years have been seen continued effort in the development of room temperature compound semiconductors devices. High-Z compound semiconductor detectors has been explored for high energy resolution, high detection efficiency and are of low cost. Compound semiconductors detectors are well suited for addressing needs of demanding applications such as bore hole logging where high operating temperature are encountered. In this work recent developments in semiconductors detectors were reviewed. This review concentrated on thallium bromide (TlBr), cadmium zinc telluride (CdZnTe) and cadmium telluride (CdTe) crystals detectors. TlBr has higher stopping power compared to common semiconductor materials because it has the higher photoelectric and total attenuation coefficients over wide energy range from 100 keV to 1 MeV. CdTe and CdZnTe detectors have several attractive features for detecting X-ray and low energy gamma ray. Their relatively large band gaps lead to a relatively low leakage current and offer an excellent energy resolution at room temperature. A literature survey and bibliography was also included. (author)

  7. Crystal structure of the R{sub 7}Cu{sub 3}Te{sub 12} (R=Tb, Dy, Ho, Er and Tm) compounds

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    Gulay, L.D. [Department of General and Inorganic Chemistry, Volyn State University, Voli Ave 13, 43009 Lutsk (Ukraine)]. E-mail: gulay@lab.univer.lutsk.ua; Olekseyuk, I.D. [Department of General and Inorganic Chemistry, Volyn State University, Voli Ave 13, 43009 Lutsk (Ukraine); Pietraszko, A. [W. Trzebiatowski Institute of Low Temperature and Structure Research, Polish Academy of Sciences, Okolna Str. 2, P.O. Box 1410, 50-950 WrocIaw (Poland)

    2005-11-10

    The crystal structures of the R{sub 7}Cu{sub 3}Te{sub 12} (R=Tb, Dy, Ho, Er and Tm) compounds (space group R3-bar m, Pearson symbol hR27-5) were determined by means of X-ray single crystal diffraction: a=0.43020(6)nm, c=4.1720(8)nm, R{sub I}=0.0498 (Ho{sub 7}Cu{sub 3}Te{sub 12}) and X-ray powder diffraction: a=0.43279(3)nm, c=4.1896(3)nm, R{sub I}=0.0932 (Tb{sub 7}Cu{sub 3}Te{sub 12}); a=0.43114(5)nm, c=4.1779(8)nm, R{sub I}=0.0891 (Dy{sub 7}Cu{sub 3}Te{sub 12}); a=0.42802(2)nm, c=4.1575(2)nm, R{sub I}=0.0849 (Er{sub 7}Cu{sub 3}Te{sub 12}); a=0.42709(3)nm, c=4.1540(3)nm, R{sub I}=0.0858 (Tm{sub 7}Cu{sub 3}Te{sub 12}). The close packed Te layers in ...hhcc... stacking exists in the crystal structure of the R{sub 7}Cu{sub 3}Te{sub 12} (R=Tb, Dy, Ho, Er and Tm) compounds. The R atoms occupy 7/12 of octahedral interstices, whereas the Cu atoms occupy 1/8 of tetrahedral interstices.

  8. Bulk and surface band structure of the new family of semiconductors BiTeX (X=I, Br, Cl)

    International Nuclear Information System (INIS)

    Highlights: • We provide an ARPES comparison between the three tellurohalides BiTeX (X = I, Br, Cl). • They present a similar band structure with namely spin-split bulk and surface states. • They offer, except for BiTeCl, the possibility of ambipolar conduction. • They can be easily doped. • From the data appeared so far, BiTeBr may be the most appealing for applications. - Abstract: We present an overview of the new family of semiconductors BiTeX (X = I, Br, Cl) from the perspective of angle resolved photoemission spectroscopy. The strong band bending occurring at the surface potentially endows them with a large flexibility, as they are capable of hosting both hole and electron conduction, and can be modified by inclusion or adsorption of foreign atoms. In addition, their trigonal crystal structure lacks a center of symmetry and allows for both bulk and surface spin-split bands at the Fermi level. We elucidate analogies and differences among the three materials, also in the light of recent theoretical and experimental work

  9. Bulk and surface band structure of the new family of semiconductors BiTeX (X=I, Br, Cl)

    Energy Technology Data Exchange (ETDEWEB)

    Moreschini, L., E-mail: lmoreschini@lbl.gov [Advanced Light Source (ALS), Lawrence Berkeley National Laboratory, Berkeley, CA 94720 (United States); Autès, G. [Institute of Theoretical Physics, Ecole Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne (Switzerland); Crepaldi, A. [Institute of Condensed Matter Physics, Ecole Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne (Switzerland); Moser, S. [Advanced Light Source (ALS), Lawrence Berkeley National Laboratory, Berkeley, CA 94720 (United States); Institute of Condensed Matter Physics, Ecole Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne (Switzerland); Johannsen, J.C. [Institute of Condensed Matter Physics, Ecole Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne (Switzerland); Kim, K.S. [Advanced Light Source (ALS), Lawrence Berkeley National Laboratory, Berkeley, CA 94720 (United States); Department of Physics, Pohang University of Science and Technology, Pohang 790-784 (Korea, Republic of); Center for Artificial Low Dimensional Electronic Systems, Institute for Basic Science, Pohang 790-784 (Korea, Republic of); Berger, H.; Bugnon, Ph.; Magrez, A. [Institute of Condensed Matter Physics, Ecole Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne (Switzerland); Denlinger, J.; Rotenberg, E.; Bostwick, A. [Advanced Light Source (ALS), Lawrence Berkeley National Laboratory, Berkeley, CA 94720 (United States); Yazyev, O.V. [Institute of Theoretical Physics, Ecole Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne (Switzerland); and others

    2015-05-15

    Highlights: • We provide an ARPES comparison between the three tellurohalides BiTeX (X = I, Br, Cl). • They present a similar band structure with namely spin-split bulk and surface states. • They offer, except for BiTeCl, the possibility of ambipolar conduction. • They can be easily doped. • From the data appeared so far, BiTeBr may be the most appealing for applications. - Abstract: We present an overview of the new family of semiconductors BiTeX (X = I, Br, Cl) from the perspective of angle resolved photoemission spectroscopy. The strong band bending occurring at the surface potentially endows them with a large flexibility, as they are capable of hosting both hole and electron conduction, and can be modified by inclusion or adsorption of foreign atoms. In addition, their trigonal crystal structure lacks a center of symmetry and allows for both bulk and surface spin-split bands at the Fermi level. We elucidate analogies and differences among the three materials, also in the light of recent theoretical and experimental work.

  10. Symmetry-dependent carrier relaxation dynamics and charge–density–wave transition in DyTe3 probed by polarized femtosecond spectroscopy

    International Nuclear Information System (INIS)

    Photo-induced quasi-particle (QP) relaxation dynamics with different symmetries have been investigated for the multiple charge–density–wave (CDW) compound DyTe3 by using ultrafast polarized pump-probe spectroscopy. By performing symmetry analysis, the QP dynamics with isotropic A1g and anisotropic B2g symmetry were found to show unique anomalies at the first and second CDW transitions. Both the temperature dependence and pump fluence dependence indicate that the B2g response is very sensitive to the underlying lattice deformation, which provides critical insight into the multiple CDW formations. (paper)

  11. Clusters and ions in {TR_6}X{sub 12}R (T=Fe, Co, Ru, Os, Ir, R=Dy, Ho, Er, X=Br, I)—A magnetic study

    Energy Technology Data Exchange (ETDEWEB)

    Valldor, Martin, E-mail: martin.valldor@cpfs.mpg.de [Physics Department, University of Cologne, Zülpicher Straße 77, D-50937 Cologne (Germany); Max Planck Institute for Chemical Physics of Solids, Nöthnitzer Straße 40, D-01187 Dresden (Germany); Meyer, Eva; Rustige, Christian; Meyer, Gerd [Department of Chemistry, Inorganic Chemistry, University of Cologne, Greinstraße 6, D-50939 Cologne (Germany)

    2013-12-15

    Eight cluster complex compounds with the composition {TR_6}X{sub 12}R (T=Fe, Co, Ru, Os, Ir, R=Dy, Ho, Er, X=Br, I) exhibiting the same crystal structure, {BSc_6}Cl{sub 12}Sc type, were investigated by magnetometry. A diversity of magnetic properties was recorded depending on chemical compositions. Long range spin order is suggested for {CoHo_6}I{sub 12}Ho, {FeHo_6}I{sub 12}Ho and {OsDy_6}I{sub 12}Dy below 40, 20 and 17 K, respectively. The occurrence of 1–10% magnetic energy losses at lower temperatures with strong frequency dependence makes several of the compounds comparable with molecular magnets. Both the {TR_6} cluster and the single R{sup 3+} ion contribute to out-of-phase susceptibility; these effects appear separately and can be investigated individually by employing an AC-magnetic field. - Highlights: • The presented complex transition metal rare-earth metal halogenides contain magnetic single ions and metal clusters. • Depending on the involved elements, a variety of magnetic ground states is observed. • Several of the compounds exhibit 1–10% of magnetic energy losses on applying an alternating magnetic driving field. • These losses exhibit relatively strong shifts in temperature on changing the driving frequency. • Hence, several of the compounds behave similarly to molecular magnets although the chemistry is quite different.

  12. Stellar (n,γ) cross sections of p-process isotopes Part I: 102Pd, 120Te, 130,132Ba, and 156Dy

    International Nuclear Information System (INIS)

    We have investigated the (n,γ) cross sections of p-process isotopes with the activation technique. The measurements were carried out at the Karlsruhe Van de Graaff accelerator using the 7Li(p,n)7Be source for simulating a Maxwellian neutron distribution of kT=25 keV. Stellar cross section measurements are reported for the light p-process isotopes 102Pd, 120Te, 130,132Ba, and 156Dy. In a following paper the cross sections of 168Yb, 180W, 184Os, 190Pt, and 196Hg will be discussed. The data are extrapolated to p-process energies by including information from evaluated nuclear data libraries. The results are compared to standard Hauser-Feshbach models frequently used in astrophysics.

  13. 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.

  14. 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.

  15. Crystal structures of the compounds R{sub 3}CuSe{sub 6} (R = Gd, Tb and Dy) and TbCu{sub 0.34}Te{sub 2}

    Energy Technology Data Exchange (ETDEWEB)

    Gulay, L.D. [Department of General and Inorganic Chemistry, Volyn State University, Voli Avenue 13, 43009 Lutsk (Ukraine)]. E-mail: gulay@lab.univer.lutsk.ua; Olekseyuk, I.D. [Department of General and Inorganic Chemistry, Volyn State University, Voli Avenue 13, 43009 Lutsk (Ukraine)

    2005-01-25

    The crystal structures of the compounds R{sub 3}CuSe{sub 6} (R = Gd, Tb and Dy) (Sm{sub 3}CuSe{sub 6} structure type, space group Pbcm, Pearson symbol oP40) and TbCu{sub 0.34}Te{sub 2} (LaCu{sub 0.28}Te{sub 2} structure type, space group Pbcm, Pearson symbol oP13.36) were determined by means of X-ray powder diffraction: a 0.70902(3) nm, b = 0.77850(3) nm, c = 1.68576(7) nm, R{sub I} = 0.0882 (Gd{sub 3}CuSe{sub 6}); a = 0.70630(3) nm, b = 0.77396(3) nm, c = 1.67913(8) nm, R{sub I} 0.0806 (Tb{sub 3}CuSe{sub 6}); a = 0.70463(4) nm, b = 0.76962(4) nm, c = 1.6680(1) nm, R{sub I} = 0.0928 (Dy{sub 3}CuSe{sub 6}); a = 0.75580(3) nm, b = 0.81753(3) nm, c 0.60828(2) nm, R{sub I} = 0.0864 (TbCu{sub 0.34}Te{sub 2})

  16. 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.

  17. 2-Chlorovinyl tellurium dihalides, (p-tol)Te[C(H)=C(Cl)Ph]X{sub 2} for X = Cl, Br and I: variable coordination environments, supramolecular structures and docking studies in cathepsin B

    Energy Technology Data Exchange (ETDEWEB)

    Caracelli, Ignez, E-mail: ignez@ufscar.b [Universidade Federal de Sao Carlos (UFSCar), SP (Brazil). Dept. de Fisica; Zukerman-Schpector, Julio; Maganhi, Stella H., E-mail: julio@power.ufscar.b [Universidade Federal de Sao Carlos (UFSCar), SP (Brazil). Dept. de Quimica. Lab. de Cristalografia, Estereodinamica e Modelagem Molecular; Stefani, Helio A. [Universidade de Sao Paulo (USP), SP (Brazil). Faculdade de Ciencias Farmaceuticas. Dept. de Farmacia; Guadagnin, Rafael [Universidade Federal de Sao Paulo (Unifesp/EPM), Sao Paulo, SP (Brazil). Dept. de Quimica; Tiekink, Edward R.T., E-mail: edward.tiekink@gmail.co [University of Malaya, Kuala Lumpur (Malaysia). Dept. of Chemistry

    2010-07-01

    Crystallography shows that the Te atom in each of (p-tol)Te[C(H)=C(Cl)Ph]X{sub 2}, for X = Cl (1), Br (2) and I (3), is within a distorted {Psi}-pentagonal bipyramidal geometry. An E configuration for the vinyl group in (1) precludes the formation of an intramolecular Te...Cl interaction so that an intramolecular Te{pi} interaction is found instead. The coordination environment features a linear Cl-Te-Cl arrangement with the pentagonal plane defined by the two C atoms of the organic substituents, an intermolecular TeCl contact, a Te{pi} interaction and a stereochemically active lone pair of electrons. In the X = Br (2) and I (3) structures, similar coordination geometries are found but the Te{pi} contact is replaced by an intramolecular TeCl contact owing to the adoption of a Z configuration about the vinyl bond. The differences in structure are readily explained in terms of electronic effects. Docking studies of cathepsin B with (1')-(3'), i.e. 1-3 less one Te-bound halide, show efficient binding through the agency of covalent Te-S{sub Cys29} bonds with stabilization afforded by a combination of N-H{pi}, C-H{pi} and Cl{sub vinyl} H interactions. These results comparable favorably with known inhibitors of cathepsin B suggesting the title compounds have potential biological activity. (author)

  18. 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.

  19. 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...

  20. Diaroyl Tellurides: Synthesis, Structure and NBO Analysis of (2-MeOC6H4CO2Te – Comparison with Its Sulfur and Selenium Isologues. The First Observation of [MgBr][R(C=TeO] Salts

    Directory of Open Access Journals (Sweden)

    Fumio Ando

    2009-07-01

    Full Text Available A series of aromatic diacyl tellurides were prepared in moderate to good yields by the reactions of sodium orpotassium arenecarbotelluroates with acyl chlorides in acetonitrile. X-ray structure analyses and theoretical calculations of 2-methoxybenzoic anhydride and bis(2-methoxybenzoyl sulfide, selenide and telluride were carried out. The two 2-MeOC6H4CO moieties of bis(2-methoxybenzoyl telluride are nearly planar and the two methoxy oxygen atoms intramolecularly coordinate to the central tellurium atom from both side of C(11-Te(11-C(22 plane. In contrast, the oxygen and sulfur isologues (2-MeOC6H4CO2E (E = O, S, show that one of the two methoxy oxygen atoms contacts with the oxygen atom of the carbonyl group connected to the same benzene ring. The structure of di(2-methoxybenzoyl selenide which was obtained by MO calculation resembles that of tellurium isologues rather than the corresponding oxygen and sulfur isologues. The reactions of di(aroyl tellurides with Grignard reagents lead to the formation of tellurocarboxylato magnesium complexes [MgBr][R(C=TeO].

  1. Effect of ionic liquid amount (C{sub 8}H{sub 15}BrN{sub 2}) on the morphology of Bi{sub 2}Te{sub 3} nanoplates synthesized via a microwave-assisted heating approach

    Energy Technology Data Exchange (ETDEWEB)

    Ji Guangbin [Jiangsu Provincial Key Laboratory of Photonic and Electronic Materials Sciences and Technology, College of Electronic Science and Engineering, Nanjing University, Nanjing 210093 (China); Shi Yi, E-mail: yshi@nju.edu.cn [Jiangsu Provincial Key Laboratory of Photonic and Electronic Materials Sciences and Technology, College of Electronic Science and Engineering, Nanjing University, Nanjing 210093 (China); Pan Lijia; Zheng Youdou [Jiangsu Provincial Key Laboratory of Photonic and Electronic Materials Sciences and Technology, College of Electronic Science and Engineering, Nanjing University, Nanjing 210093 (China)

    2011-05-19

    Highlights: > Rapidly synthesis Bi{sub 2}Te{sub 3} nanoplates via a microwave-assisted ionic liquid method. > Ionic liquid plays a key role on the morphologies of the samples. > Single-crystal in nature with the growth direction of <112-bar 0>. > Power factor gets a maximum at about 450 K. - Abstract: Bi{sub 2}Te{sub 3} crystals with plate-like morphology have been successfully synthesized via a microwave-assisted heating approach in room temperature ionic liquid (RTIL) of 1-butyl-3-methylimidazolium bromide (C{sub 8}H{sub 15}BrN{sub 2}). Scanning electronic microscopy (SEM) observation of as-synthesized Bi{sub 2}Te{sub 3} confirmed their morphology of the hexagonal plates. It was observed that the edge and thickness values of as-synthesized Bi{sub 2}Te{sub 3} were in the size of 0.5-2 {mu}m and less than 100 nm, respectively. High-resolution transmission electronic microscopy (HR-TEM) and selected area electron diffraction (SAED) results revealed that the Bi{sub 2}Te{sub 3} plates are of single-crystal in nature with the growth direction of <112-bar 0>. In addition, as increasing the amount of ionic liquid, SEM results showed a novel evolution process of Bi{sub 2}Te{sub 3} morphologies from mixture of Bi{sub 2}Te{sub 3} nanorods and nanoplates to regular hexagonal plates, and then nanoplates with many small flecks. Furthermore, a possible mechanism regarding the formation of Bi{sub 2}Te{sub 3} plates was proposed as well on the basis of the experimental results. The power factor of Bi{sub 2}Te{sub 3} nanoplates is examined to evaluate its thermoelectric property.

  2. High-field magnetization of a two-dimensional spin frustration system, Ni{sub 5}(TeO{sub 3}){sub 4}X{sub 2} (X = Br, Cl)

    Energy Technology Data Exchange (ETDEWEB)

    Her, J L; Matsuda, Y H; Suga, K; Kindo, K; Takeyama, S [Institute for Solid State Physics, University of Tokyo (Japan); Berger, H [Institutes of Physics of Complex Matter, EPFL, Lausanne (Switzerland); Yang, H D [Department of Physics, Center for Nanoscience and Nanotechnology, National Sun Yat-sen University, Taiwan (China)

    2009-10-28

    The high-field magnetization, M(H), of Ni{sub 5}(TeO{sub 3}){sub 4}X{sub 2} (X = Br, Cl) was measured by using a pulse magnet. These compounds have a two-dimensional crystal structure and a distorted Kagome spin frustrated system which is built from the Ni{sup 2+} ions (S = 1). The Neel transition temperatures are T{sub N}approx28 and 23 K for X = Br and Cl, respectively. When TBr and Cl, respectively. On the other hand, for T>T{sub N}, the field-dependent magnetization curves behave like a monotonically increasing straight line up to 55 T. The H{sub c} value is close to those obtained in previous spin resonance studies in which a model of a spin-flop scenario was proposed to explain the field-dependent resonance spectra. With the earlier model a further transition at around 23 T was predicted; however, our observations did not show any plateau behaviors, saturation or other anomalies up to 55 T, suggesting that the further transition possibly exists in a much higher field region.

  3. Decomposition of DyF3 and its effect on magnetic performance of DyF3-doped Nd-Fe-B-type hot-deformed magnet

    Science.gov (United States)

    Kim, J. Y.; Kwon, H. W.; Lee, J. G.; Yu, J. H.

    2015-05-01

    Decomposition of DyF3 and its effect on the magnetic performance of the hot-pressed compact and die-upset magnet of melt-spun Nd-Fe-B-type material were investigated. DyF3 was thermally decomposed above 660 °C, and this decomposition was linked closely to the coercivity enhancement. When the DyF3 doped flakes were hot-pressed above the decomposition temperature of DyF3, the diffusion of Dy into the flakes was promoted, and leading to profound coercivity enhancement. Coercivity of the hot-pressed magnet was further enhanced by post-hot-press annealing, and coercivity as high as 24.5 kOe was obtained after the optimum annealing. The DyF3 doped hot-deformed magnet exhibited enhanced magnetic performance (iHc = 17.5 kOe, Br = 12.8 kG, (BH)max = 37.6 MGOe) with respect to the un-doped magnet without sacrificing significant remanence. Coercivity was improved by 30%. In magnet in which the decomposition of DyF3 and Dy diffusion were fully accomplished, the region originally occupied by added DyF3 was completely replaced by NdF3.

  4. 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.

  5. Effect of Ligand Substitution around the Dy(III) on the SMM Properties of Dual-Luminescent Zn-Dy and Zn-Dy-Zn Complexes with Large Anisotropy Energy Barriers: A Combined Theoretical and Experimental Magnetostructural Study.

    Science.gov (United States)

    Costes, Jean Pierre; Titos-Padilla, Silvia; Oyarzabal, Itziar; Gupta, Tulika; Duhayon, Carine; Rajaraman, Gopalan; Colacio, Enrique

    2016-05-01

    The new dinuclear Zn(II)-Dy(III) and trinuclear Zn(II)-Dy(III)-Zn(II) complexes of formula [(LZnBrDy(ovan) (NO3)(H2O)](H2O)·0.5(MeOH) (1) and [(L(1)ZnBr)2Dy(MeOH)2](ClO4) (3) (L and L(1) are the dideprotonated forms of the N,N'-2,2-dimethylpropylenedi(3-methoxysalicylideneiminato and 2-{(E)-[(3-{[(2E,3E)-3-(hydroxyimino)butan-2-ylidene ]amino}-2,2-dimethylpropyl)imino]methyl}-6-methoxyphenol Schiff base compartmental ligands, respectively) have been prepared and magnetostructurally characterized. The X-ray structure of 1 indicates that the Dy(III) ion exhibits a DyO9 coordination sphere, which is made from four O atoms coming from the compartmental ligand (two methoxy terminal groups and two phenoxido bridging groups connecting Zn(II) and Dy(III) ions), other four atoms belonging to the chelating nitrato and ovanillin ligands, and the last one coming to the coordinated water molecule. The structure of 3 shows the central Dy(III) ion surrounded by two L(1)Zn units, so that the Dy(III) and Zn(II) ions are linked by phenoxido/oximato bridging groups. The Dy ion is eight-coordinated by the six O atoms afforded by two L(1) ligands and two O atoms coming from two methanol molecules. Alternating current (AC) dynamic magnetic measurements of 1, 3, and the previously reported dinuclear [LZnClDy(thd)2] (2) complex (where thd = 2,2,6,6-tetramethyl-3,5-heptanedionato ligand) indicate single molecule magnet (SMM) behavior for all these complexes with large thermal energy barriers for the reversal of the magnetization and butterfly-shaped hysteresis loops at 2 K. Ab initio calculations on 1-3 show a pure Ising ground state for all of them, which induces almost completely suppressed quantum tunnelling magnetization (QTM), and thermally assisted quantum tunnelling magnetization (TA-QTM) relaxations via the first excited Kramers doublet, leading to large energy barriers, thus supporting the observation of SMM behavior. The comparison between the experimental and theoretical

  6. Indexação Social e Pensamento Dialógico: reflexões teóricas> Indización Social y Pensamiento Dialógico: reflexiones teóricas

    OpenAIRE

    Eduardo José Wense Dias; Roger De Miranda Guedes; Maria Aparecida Moura

    2012-01-01

    Introdução: A linguagem é o ponto de partida para o estabelecimento da interação verbal entre interlocutores, não apenas em uma situação formalizada pela escrita ou pelo cenário midiático, mas em todos os momentos em que se quer estabelecer uma ação comunicativa entre interlocutores a linguagem é a ponte que une pessoas e que permite a geração de conhecimento. Objetivo: Apresenta reflexões teóricas acerca da indexação social, entendida como processo de representação da informação em espaços s...

  7. Synthesis, Crystal Structure and Luminescent Properties of TbCu(TeO3)2Cl

    Institute of Scientific and Technical Information of China (English)

    2007-01-01

    TbCu(TeO3)2Cl was obtained in high yield from high temperature solid-state reacion of Tb4O7, CuO, CuCl2 and TeO2 in a 1:2:2:8 molar ratio at 710 ℃ in an evacuated quartz tube. Its structure was established by single-crystal X-ray diffraction. The title compound crystallizes in monoclinic, space group P21/c, with a=5.409(2), b=14.994(6), c=9.183(4)(A) ,β=98.884(5)°, V=735.8(5)(A)3 and Z=4. TbCu(TeO3)2Cl is isostructural with LnCu(TeO3)2X (Ln=Dy, X=Cl; Ln=Er, X=Cl, Br). Its structure features a three-dimensional (3D) network built from Tb(Ⅲ) and Cu(Ⅱ) ions interconnected by tellurite and chloride anions; the chloride anion and the lone-pair electrons of the tellurium(Ⅳ) ions are oriented toward the cavities of the tunnels in the network. Solid-state luminescent spectrum of TbCu(TeO3)2Cl shows a strong emission band at 545 nm with a luminescent life time of 291μs.

  8. The Dy-Zn phase diagram

    Science.gov (United States)

    Saccone, A.; Cardinale, A. M.; Delfino, S.; Ferro, R.

    2003-03-01

    The dysprosium-zinc phase diagram has been investigated over its entire composition range by using differential thermal analysis, (DTA) metallographic analysis, X-ray powder diffraction, and electron probe microanalysis (EPMA). Seven intermetallic phases have been found and their structures confirmed. DyZn, DyZn2, Dy13Zn58, and Dy2Zn17 melt congruently at 1095 °C, 1050 °C, 930 °C, and 930 °C, respectively. DyZn3, Dy3Zn11, and DyZn12 form through peritectic reactions at 895 °C, about 900 °C and 685 °C, respectively. Four eutectic reactions occur at 850 °C and 30.0 at pct Zn (between (Dy) and DyZn), 990 °C and 60.0 at pct Zn (between DyZn and DyZn2), 885 °C and 76.0 at pct Zn (between DyZn3 and Dy3Zn11), and 875 °C and 85.0 at pct Zn (involving Dy13Zn58 and Dy2Zn17). The Dy-rich end presents a catatectic equilibrium; a degenerate invariant effect has been found in the Zn-rich region. The phase equilibria of the Dy-Zn alloys are discussed and compared with those of the other known RE-Zn systems (RE=rare earth metal) in view of the regular change in the relative stabilities of the phases across the lanthanide series

  9. 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.

  10. Reactor BR2

    Energy Technology Data Exchange (ETDEWEB)

    Gubel, P

    2000-07-01

    The BR2 reactor is still SCK-CEN's most important nuclear facility. After an extensive refurbishment to compensate for the ageing of the installation, the reactor was restarted in April 1997. Various aspects concerning the operation of the BR2 Reactor, the utilisation of the CALLISTO loop and the irradiation programme, the BR2 R and D programme and the production of isotopes and of NTD-silicon are discussed. Progress and achievements in 1999 are reported.

  11. Nuclear levels of 163Dy

    International Nuclear Information System (INIS)

    Gamma-radiation spectra have been measured in the energy range of 93-850 keV for the 163Dy (n, n'γ) reaction, and a comparison with the gamma-radiation spectrum of the (n, γ) reaction has been done. The data analysis allows to extend the 163Dy level scheme up to 1.2 MeV of the excitation energy. The level determination is based on energy balance for populating and depopulating gamma transitions. The level spin values have been estimated by a comparison of the transition intensities for the (n, n'γ) and (n, γ) reactions. Some new levels have been introduced basing on measured gamma-gamma coincidences

  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. Influence du phénomène océanique pacifique, "El Nino", sur l'upwelling et le climat de la région du Cabo Frio, sur la côte brésilienne de l'Etat de Rio de Janeiro

    OpenAIRE

    Martin, Louis; Flexor, J.M.; Valentin, J. L.

    1988-01-01

    Le phénomène océanique pacifique connu sous le nom de "El Nino", peut perturber la circulation atmosphérique de l'Amérique du Sud et le régime des vents sur la côte Atlantique du Sud et du Sud-est du Brésil. Ceci provoque un renforcement ou une disparition de l' "upwelling" local de la région du Cabo Frio (Etat de Rio de Janeiro), avec des conséquences sur le climat et la salinité de la lagune voisine d'Araruama. Etudier ces variations, dans des sédiments lagunaires, devrait permettre d'établ...

  14. [166Dy]Dy/166Ho hydroxide macroaggregates: an in vivo generator system for radiation synovectomy.

    Science.gov (United States)

    Ferro-Flores, G; Hernández-Oviedo, O; Arteaga de Murphy, C; Tendilla, J I; Monroy-Guzmán, F; Pedraza-López, M; Aldama-Alvarado, K

    2004-12-01

    Radiation synovectomy is an effective treatment in patients suffering from inflammatory-rheumatoid and degenerative joint diseases. The aim of this work was to examine the feasibility of preparing dysprosium-166 (166Dy)/holmium-166(166Ho) hydroxide macroaggregates ([166Dy]Dy/166Ho-HM) as an in vivo generator for radiation synovectomy evaluating whether the stability of 166Dy-HM and 166Ho-HM complexes is maintained when the daughter 166Ho is formed. The Monte Carlo (MCNP4B) theoretical depth dose profile for the in vivo [166Dy]Dy/166Ho generator system in a joint model was calculated and compared with that produced by 90Y, 153Sm and 166Ho. 166Dy was obtained by neutron irradiation of enriched 164Dy2O3 in a Triga Mark III reactor. Macroaggregates were prepared by reaction of [166Dy]DyCl3 with 0.5 M NaOH in an ultrasonic bath. [166Dy]Dy/166Ho-HM was obtained with radiochemical purity >99.5% and with the majority of particles in the 2-5 microm range. In vitro studies demonstrated that the radio-macroaggregates are stable in saline solution and human serum without a significant change in the particle size over 14 d, suggesting that no translocation of the daughter nucleus occurs subsequent to beta- decay of 166Dy. Biological studies in normal rats demonstrated high retention in the knee joint even 7 d after [166Dy]Dy/166Ho-HM administration. The Monte Carlo (MCNP4B) theoretical depth dose profiles in a joint model, showed that the in vivo [166Dy]Dy/166Ho generator system would produce 25% and 50% less radiation dose to the articular cartilage and bone surface, respectively, than that produced by 90Y or pure 166Ho in a treatment with the same therapeutic dose to the synovium surface. Despite that 153Sm showed the best depth dose profile sparing doses to healthy tissues, the use of 166Dy could provide the advantage of being applied in patients that cannot be reached within a few hours from a nuclear reactor and to produce less radiation exposure to the medical personnel

  15. Search for superdeformed bands in 154Dy

    International Nuclear Information System (INIS)

    The island of superdeformation in the vicinity of the doubly magic 152Dy yrast superdeformed (SD) band is thought to be well understood in the framework of cranked mean field calculations. In particular, the calculations suggested that in 154Dy there should be no yrast or near yrast SD minimum in the 40-60 h spin range, where SD bands in this mass region are thought to be 153Dy nucleus, it is populated. However, with the presence of five SD bands in the neighboring necessary to ascertain if the addition of one single neutron diminishes the importance of shell effects to the extent that superdeformation can no longer be sustained. In an experiment utilizing the increased resolving power of the early implementation phase of Gammasphere, the reaction 122Sn(36S,4n) at 165 MeV was employed to populate high spin states in 154Dy. In a four-day run with 36 detectors, over one billion triple and higher fold coincidence events were recorded. One new SD band was identified and was assigned to 154Dy. From comparisons with the Im(2) moments of inertia of the SD bands in 152Dy and 153Dy, a configuration based on (514)9/22 neutrons coupled to the 152Dy SD core was proposed. One unexpected and as yet unexplained feature of this new SD band is that the transition energies are almost identical to those of an excited SD band in 153Dy. It is also worth noting that the feeding of the yrast states is similar to that achieved by the deexcitation from the ensemble of all entry states in the reaction. This observation emphasizes the statistical nature of the decay-out process. A paper reporting these results was accepted for publication

  16. 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...

  17. White light generation from Dy3+ doped tellurite glass

    Science.gov (United States)

    Damak, Kamel; Yousef, El Sayed; Rüssel, Christian; Maâlej, Ramzi

    2014-02-01

    This paper reports on the spectral results of Dy3+ (1.0 mol%) ions-doped TeO2-ZnO-PbO-PbF2-Na2O (TZPPN) glass. Raman spectrum measurements, differential thermal analysis (DTA) profiles of this rare-earth ion-doped glass were carried out. From the DTA thermogram, glass transition (Tg), crystallization (Tc) and melting (Tm) temperatures were evaluated. Direct and indirect optical band gaps were calculated based on the glasses UV absorption spectra. From the absorption spectra, Judd-Ofelt (J-O) intensity parameters, Ωk, were calculated. Using J-O intensity parameters, several radiative properties such as spontaneous transition probabilities (AR), radiative branching ratios (βR) and radiative lifetimes (τR) were determined for the excitation level 4F9/2. From the emission spectra, a strong yellow emission at 574 nm (4F9/2→6H13/2) was observed and it also showed a combination of blue and red emission bands for this glass. The stimulated emission cross-section σ(λp) was also evaluated for the 4F9/2→6HJ (J=11/2, 13/2, and 15/2) transitions. This study indicates that 1 mol% Dy2O3-doped tellurite glass can be considered for white light generation with the excitation of blue light (454 nm).

  18. La langue « la plus commune » de la côte du Brésil : grammaires, vocabulaires et catéchismes en langue native dans l’Amérique portugaise

    OpenAIRE

    John M. Monteiro

    2014-01-01

    Lorsque les jésuites ont installé leurs missions sur le littoral brésilien au xvie siècle, ils ont dû résoudre le problème linguistique de la communication avec des populations aux langues très variées qui n’avaient jamais connu l’écriture. Cet article analyse l’effort qui a été fait pour « réduire » cette diversité à une langue commune, la « langue générale » qui, dès lors, a servi de médiation entre deux cultures et de vecteur à une double colonisation des corps et des âmes. Les instruments...

  19. Populations locales et unités de conservation : De l'exclusion à une inclusion incomplète (le cas de la Forêt Nationale du Tapajós, Amazonie brésilienne)

    OpenAIRE

    Couly, Claire; Arnauld De Sartre, Xavier

    2012-01-01

    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 p...

  20. When Polypropylene Fiber Can Be Dyed

    Institute of Scientific and Technical Information of China (English)

    By Tom Xue

    2008-01-01

    @@ What if polypropylene fiber can be dyed someday? That means fiber offers immense production possibilities,means manufacturers will benefit from increasing their operational effectiveness,reducing the inventory of colored yarns,means streamline production process,means……

  1. Phase Formation and Magnetic Properties of Nanocomposite Nd-Fe-B Adjusted by Small Amount of Dy and Co

    Institute of Scientific and Technical Information of China (English)

    T S Jang; T W Lim; H S Aum; D H Lee; M B Kim

    2004-01-01

    In order to improve and stabilize the magnetic properties of nanocomposite Nd2Fe14B/α-Fe magnetic alloys by a compositional adjustment, small amount of Dy and/or Co was added to Nd9Fe84B7 alloys. DTA analysis on the amorphous of the alloys took place as the soft magnetic phases were crystallized, and then the hard magnetic Nd2Fe14B was precipitated from them. While α-Fe and a metastable 1:7 (TbCu7-type) phase were formed simultaneously in Dy and Co-free alloys, they were crystallized separately at different temperatures after Dy or Co was added. This phase separation occurred more clearly in the Dy-treated alloys and the other soft magnetic phase Fe3B was also stabilized by Dy and/or Co. The 1: 7 phase that was stabilized by Dy and/or Co was not eliminated at 700 ℃, decreasing magnetic properties of the alloys. It was eventually disappeared above 725 ℃, but Fe3B was not eliminated even at 750 ℃ when Dy was added more than 0.5 at% or Co was added more than 2.0 at%. Amount of Nd2Fe14B in the alloys tended to increase as Dy addition increased,whereas Co addition did not lead to any appreciable change in the ratio of α-Fe and Nd2Fe14B. Moreover, Dy addition apparently increased coercivity of an alloy while Co addition had a beneficial effect on remanence. The grains in the Dytreated alloys were usually finer than those in the Co-treated alloys. The grain size of both α-Fe and Nd2Fe14B in the alloys exhibiting mr ≥ 0.72 was in the range of 20 ~ 40 nm or even larger 50 nm, which is larger than the theoretical optimum size ( ~ 10 nm). Typical magnetic properties obtained from a Nd7.5Dy1.5Fe82.5Co1.5B7 alloy annealed for 12 min at 725 ℃were iHc=4.85 kOe, Br= 11.32 kG, (BH)max = 15.73 MGOe, and mr=0.73.

  2. 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...

  3. X-ray photoelectron spectroscopy and magnetism of AlDyNi, AlDyNi4 and AlDy3Ni8 compounds

    International Nuclear Information System (INIS)

    The electronic and magnetic properties of AlDyNi, AlDyNi4 and AlDy3Ni8 are studied using X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD), static and dynamic magnetic measurements. The three compounds AlDyNi, AlDyNi4 and AlDy3Ni8 are single phases and crystallize in the Fe2P, CaCu5 and CeNi3 structure types, respectively. All the investigated compounds order ferromagnetically below the corresponding Curie temperatures. The Curie temperature and the magnetic moments are 25 K and 6 μB/f.u. for AlDyNi, 14 K and 6.9 μB/f.u. for AlDyNi4 and 22K and 19.2 μB/f.u. for AlDy3Ni8. At high temperature the magnetic susceptibility obey the Curie-Weiss law. The paramagnetic Curie temperature and the effective magnetic moments are 30K and 10.88 μB/f.u. for AlDyNi, 28 K and 10.94 μB/f.u. for AlDyNi4 and 18 K and 18.33 μB/f.u. for AlDy3Ni8. XPS valence band and Ni 2p spectra indicated the presence of small magnetic moment on Ni sites in AlDy3Ni8 and AlDyNi4, and a complete filling of Ni 3d band in AlDyNi.

  4. Reactor BR2. Introduction

    International Nuclear Information System (INIS)

    The BR2 is a materials testing reactor and is still one of SCK-CEN's important nuclear facilities. After an extensive refurbishment to compensate for the ageing of the installation, the reactor was restarted in April 1997. During the last three years, the availability of the installation was maintained at an average level of 97.6 percent. In the year 2000, the reactor was operated for a total of 104 days at a mean power of 56 MW. In 2000, most irradiation experiments were performed in the CALLISTO PWR loop. The report describes irradiations achieved or under preparation in 2000, including the development of advanced facilities and concept studies for new programmes. An overview of the scientific irradiation programmes as well as of the R and D programme of the BR2 reactor in 2000 is given

  5. Reactor BR2. Introduction

    Energy Technology Data Exchange (ETDEWEB)

    Gubel, P

    2002-04-01

    The BR2 materials testing reactor is one of SCK-CEN's most important nuclear facilities. After an extensive refurbishment to compensate for the ageing of the installation, the reactor was restarted in April 1997. In 2001, the reactor was operated for a total of 123 days at a mean power of 59 MW in order to satisfy the irradiation conditions of the internal and external programmes using mainly the CALLISTO PWR loop. The mean consumption of fresh fuel elements was 5.26 per 1000 MWd. Main achievements in 2001 included the development of a three-dimensional full-scale model of the BR2 reactor for simulation and prediction of irradiation conditions for various experiments; the construction of the FUTURE-MT device designed for the irradiation of fuel plates under representative conditions of geometry, neutron spectrum, heat flux and thermal-hydraulic conditions and the development of in-pile instrumentation and a data acquisition system.

  6. Reactor BR2. Introduction

    Energy Technology Data Exchange (ETDEWEB)

    Gubel, P

    2001-04-01

    The BR2 is a materials testing reactor and is still one of SCK-CEN's important nuclear facilities. After an extensive refurbishment to compensate for the ageing of the installation, the reactor was restarted in April 1997. During the last three years, the availability of the installation was maintained at an average level of 97.6 percent. In the year 2000, the reactor was operated for a total of 104 days at a mean power of 56 MW. In 2000, most irradiation experiments were performed in the CALLISTO PWR loop. The report describes irradiations achieved or under preparation in 2000, including the development of advanced facilities and concept studies for new programmes. An overview of the scientific irradiation programmes as well as of the R and D programme of the BR2 reactor in 2000 is given.

  7. 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.

  8. Manipulation of Dy-Mn coupling and ferrielectric phase diagram of DyMn2O5: The effect of Y substitution of Dy

    Science.gov (United States)

    Zhao, Z. Y.; Wang, Y. L.; Lin, L.; Liu, M. F.; Li, X.; Yan, Z. B.; Liu, J.-M.

    2015-11-01

    DyMn2O5 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 DyMn2O5 where the exchange-strictions associated with the Mn3+-Mn4+-Mn3+ blocks and Dy3+-Mn4+-Dy3+ blocks generate the two ferroelectric sublattices, we perform a set of characterizations on the structure, magnetism, and electric polarization of Dy1-xYxMn2O5 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 Dy3+ spin ordering and the Dy-Mn coupling. Consequently, the ferroelectric sublattice generated by the exchange striction associated with the Dy3+-Mn4+-Dy3+ blocks is destabilized, but the ferroelectric sublattice generated by the exchange striction associated with the Mn3+-Mn4+-Mn3+ 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 DyMn2O5 but probably also other RMn2O5 members with strong 4f-3d coupling.

  9. Magnetic reversal in Dy-doped DyF e2/YF e2 superlattice films

    Science.gov (United States)

    Stenning, G. B. G.; Bowden, G. J.; de Groot, P. A. J.; van der Laan, G.; Figueroa, A. I.; Bencok, P.; Steadman, P.; Hesjedal, T.

    2015-03-01

    Reversible magnetic exchange springs can be formed in the magnetically soft YF e2 layers of epitaxial DyF e2/YF e2 multilayer films. Here we show that the insertion of just two monolayers of DyF e2 , placed directly in the middle of the YF e2 layers, brings about substantial changes. Results are presented for a Dy-doped (110)-oriented [DyFe2(60Å) /YFe2(120 Å ) /DyFe2(8 Å ) /YFe2(120 Å ) ] 15 multilayer film, measured at 100 K in fields of up to ±10 T. Using bulk magnetometry, micromagnetic modeling, and Dy-specific x-ray magnetic circular dichroism, it is shown that Dy doping substantially increases the number of spin states available to the system. Altogether 12 distinct spring states are identified which bring additional complexity to the magnetic reversal process. In particular, the exchange springs are no longer reversible, exhibiting magnetic exchange-spring collapse. Full and partial magnetic loops are presented for fields applied along the in-plane easy [001] axis and the in-plane hard [1 ¯10 ] axis. In particular, it is demonstrated that exchange-spring collapse is sharpest when the field is applied along a hard in-plane [1 ¯10 ] axis.

  10. Structural and luminescence studies on Dy3+ doped lead boro-telluro-phosphate glasses

    Science.gov (United States)

    Selvi, S.; Venkataiah, G.; Arunkumar, S.; Muralidharan, G.; Marimuthu, K.

    2014-12-01

    This paper reports results obtained on the structural and luminescence properties of Dy3+doped lead boro-telluro-phosphate glasses prepared following the melt quenching technique. FTIR spectra exhibit the presence of B-O vibrations, P-O-P symmetric vibrations and Te-O stretching modes of TeO3 and TeO6 units. The metal-ligand bond was identified through UV-vis-NIR absorption spectra and to determine the band tailing parameter, direct and indirect band gap energy of the prepared glasses. The Judd-Ofelt (JO) intensity parameters (Ω2, Ω4 and Ω6), experimental and theoretical oscillator strengths were also determined and reported. Luminescence measurements were made to determine the transition probability (A), stimulated emission cross-section (σPE) and branching ratio (βR) for the transitions that include 4F9/2→6H11/2, 6H13/2 and 6H15/2 bands. The effect of Dy3+ ion concentration on the intensity ratio of yellow to blue emission bands has also been studied and reported. The lifetime corresponding to the 4F9/2 level of the title glasses has been found to decrease with the increase in Dy3+ ion concentration. The chromaticity coordinates (x,y) have been estimated from the luminescence spectra and the suitability of title glasses for white light applications has been analyzed using CIE chromaticity diagram. The variation of optical properties with the concentration of dysprosium oxide content in the glasses have been studied and reported.

  11. Activation of Small Molecules by DyI_2 and Dy

    Institute of Scientific and Technical Information of China (English)

    2007-01-01

    1 Results The reactivities of dysprosium diiodide and metallic dysprosium toward small molecules are discussed.For instance,DyI2-induced silyl radical reactions are described.The combination of dysprosium diiodide and dichloromethane can serve as an effective methylene transfer reagent for cyclopropanation of unfunctionalized alkenes beyond that possible with other metal-dichloromethane systems.Furthermore,we report that the combination of chlorosilane and metallic Dy can also serve as an effective prom...

  12. 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...

  13. Characterization of Microstructure and Magnetic Properties of NdFeB Magnet with Dy, Al and Cu Additions

    Institute of Scientific and Technical Information of China (English)

    Lü Yousheng; Chen Yiqing; Su Yong; Cheng Wenhao; Xiong Yongfei; Yi Xiaofei; Zhou Qingtao

    2007-01-01

    A new alloy of Nd33.5Dy0.99Febal.Al0.52Cu0.1B1.15 (%, mass fraction) was fabricated by powder metallurgy. The effects of Dy, Al and Cu additions on the microstructure and magnetic properties of sintered NdFeB magnet were investigated. The additions of Dy, Al and Cu are effective to refine grains and improve coercivity. Moreover, suitable amounts of Dy, Al and Cu lead to a demagnetization curve with good rectangularity. It is found that the sintered NdFeB magnet has relatively high magnetic performance of Br=12.17kGs, jHc=13.52kOe and (BH)max=34.71MGOe. The sintered NdFeB sample was examined by magnetic force microscope which revealed the domain structures at the surface. It is revealed that the mean Nd2Fe14B grain size is significantly larger than the average scale of the magnetic contrast. An explanation about this is that most Nd2Fe14B grains in sintered NdFeB alloy are dominated with the muhidomain structures when the magnet is in thermally demagnetization state.

  14. BR2 Reactor: Introduction

    International Nuclear Information System (INIS)

    The irradiations in the BR2 reactor are in collaboration with or at the request of third parties such as the European Commission, the IAEA, research centres and utilities, reactor vendors or fuel manufacturers. The reactor also contributes significantly to the production of radioisotopes for medical and industrial applications, to neutron silicon doping for the semiconductor industry and to scientific irradiations for universities. Along the ongoing programmes on fuel and materials development, several new irradiation devices are in use or in design. Amongst others a loop providing enhanced cooling for novel materials testing reactor fuel, a device for high temperature gas cooled fuel as well as a rig for the irradiation of metallurgical samples in a Pb-Bi environment. A full scale 3-D heterogeneous model of BR2 is available. The model describes the real hyperbolic arrangement of the reactor and includes the detailed 3-D space dependent distribution of the isotopic fuel depletion in the fuel elements. The model is validated on the reactivity measurements of several tens of BR2 operation cycles. The accurate calculations of the axial and radial distributions of the poisoning of the beryllium matrix by 3He, 6Li and 3T are verified on the measured reactivity losses used to predict the reactivity behavior for the coming decades. The model calculates the main functionals in reactor physics like: conventional thermal and equivalent fission neutron fluxes, number of displacements per atom, fission rate, thermal power characteristics as heat flux and linear power density, neutron/gamma heating, determination of the fission energy deposited in fuel plates/rods, neutron multiplication factor and fuel burn-up. For each reactor irradiation project, a detailed geometry model of the experimental device and of its neighborhood is developed. Neutron fluxes are predicted within approximately 10 percent in comparison with the dosimetry measurements. Fission rate, heat flux and

  15. Magnetic and microstructural modification of the Nd-Fe-B sintered magnet by mixed DyF3/DyHx powder doping

    Science.gov (United States)

    Kim, Tae-Hoon; Lee, Seong-Rae; Kim, Hyo-Jun; Lee, Min-Woo; Jang, Tae-Suk

    2014-05-01

    We investigated the magnetic and microstructural properties of Nd-Fe-B sintered magnets doped with DyF3, DyHx, and a mixture of DyF3 and DyHx powders. In the DyHx-doped magnet, diffusion of Dy occurs predominantly via grain boundary diffusion. However, the proportion of Dy being diffused by lattice diffusion is increased in the DyF3-doped magnet due to the different influences of F- and H+ ions. The detailed mechanism of the microstructural changes in terms of the diffusional behavior of Dy induced by the DyF3 and DyHx powder doping is discussed. The formation of a Dy-segregated Nd-rich oxide phase (RE-rich, Dy-Nd-O) was suppressed only in the DyF3-doped magnet, and the (00L) alignment of Nd2Fe14B grains in the sintered magnet increased when it was doped with the DyHx powder. We obtained the optimum microstructural and magnetic properties of the Nd-Fe-B sintered magnet through doping with a mixture of DyF3 and DyHx powders, which compensated for the drawbacks of using each powder alone.

  16. Preparation of Dy-Fe Alloy from Dy2O3 Bymolten Salt Electrochemical Process

    Institute of Scientific and Technical Information of China (English)

    Lin Jirong; Han Fujun; Zhao Liangzhong; Zhang Xiuyan; Zhao Fei

    2004-01-01

    Dy-Fe alloy replace dysprosium in the NdFeB permanent material can improve the performance and productivity and cut the cost.The electrolyte is a binary system of molten DyF3-LiF.Iron is cathode and graphite is anode.The raw material is Dy2O3 oxide.The content of dysprosium is (78 ~85 ) ± 1% in the Dy-Fe alloy made by electrolyzing in the industry producing.In the course of electrolyzing the efficiency of current, the alloy formation and the productivity of rare earths by studying the formation of electrolyte, the electrolyzing temperature, the standards and the current density of cathode, the anode shape etc were studied.The conclusion is that we can produce Dy-Fe alloy (the content of dysprosium is (78 ~ 85 ) ± 1% ) in this condition, the efficiency of current is greater than 68 %, and the productivity of rare earth is greater than 92%.The content of oxygen, calcium, wolfram is smaller than the content by reducing.

  17. Labeling of biotin with [166Dy]Dy/166Ho as a stable in vivo generator system.

    Science.gov (United States)

    Ferro-Flores, G; Arteaga de Murphy, C; Pedraza-López, M; Monroy-Guzmán, F; Meléndez-Alafort, L; Tendilla, J I; Jiménez-Varela, R

    2003-04-14

    The aim of this work was to synthesize [166Dy]Dy/166Ho-DTPA-Biotin to evaluate its potential as a new radiopharmaceutical for targeted radiotherapy. Dysprosium-166 (166Dy) was obtained by neutron irradiation of enriched 164Dy(2)O(3) in a Triga Mark III reactor. The labeling was carried out in aqueous media at pH 8.0 by addition of [166Dy]DyCl(3) to diethylenetriaminepentaacetic-alpha,omega-bis(biocytinamide) (DTPA-Biotin). Radiochemical purity was determined by high-performance liquid chromatography (HPLC) and TLC. The biological integrity of labeled biotin was studied evaluating its avidity for avidin in an agarose column and by size-exclusion HPLC analysis of the radiolabeled DTPA-Biotin with and without the addition of avidin. Stability studies against dilution were carried out by diluting the radiocomplex solution with saline solution and with human serum at 37 degrees C for 24 h. The [166Dy]Dy/166Ho-labeled biotin was obtained with a 99.1+/-0.6% radiochemical purity. In vitro studies demonstrated that [166Dy]Dy/166Ho-DTPA-Biotin is stable after dilution in saline and in human serum and no translocation of the daughter nucleus occurs subsequent to beta(-) decay of 166Dy that could produce release of 166Ho(3+). Avidity of labeled biotin for avidin was not affected by the labeling procedure. Biodistribution studies in normal mice showed that the [166Dy]Dy/166Ho-DTPA-Biotin has a high renal clearance. In conclusion, the radiolabeled biotin prepared in this investigation has adequate properties to work as a stable in vivo generator system for targeted radiotherapy. PMID:12672609

  18. Rapid coercivity increment of Nd–Fe–B sintered magnets by Dy69Ni31 grain boundary restructuring

    International Nuclear Information System (INIS)

    To enhance coercivity and reduce the rare-earth consumption of Nd–Fe–B sintered magnets simultaneously, low melting point Dy69Ni31 (at%) powders are introduced into a slightly off-stoichiometric Nd2Fe14B (2:14:1 phase) (Pr, Nd)12.36FebalB6.09 (at%) starting magnet. Because of insufficient rare-earth element, the starting magnet possesses discontinuous intergranular grain boundaries (GBs) that cannot decouple the 2:14:1 phase grains well, hence leading to a low coercivity of only 9.53 kOe. The Dy69Ni31 additive provides extra rare-earth that improves the liquid-phase sintering with the formation of continuous intergranular GBs, accompanied by the diffusion of Dy towards surface region of the 2:14:1 phase grains. A significant increment in coercivity of 6.25 kOe is realized with a slight reduction in remanence by −3.0% per unit at% Dy. Satisfactory magnetic performance with (BH)max=47.49 MGOe, Br=13.92 kGs and Hcj=13.93 kOe, is obtained in the magnet containing only 12.92 at% rare-earth elements, in which 0.68 at% Dy is included. It combines advantages of the modification of intergranular GBs and the formation of a magnetically hardening shell surrounding 2:14:1 phase grains, which can be a promising approach to fabricate low rare-earth and high performance Nd–Fe–B magnets for mass production. - Highlights: • Dy–Ni powders are introduced into slightly off-stoichiometric 2:14:1 type magnets. • Both morphology and composition are restructured in intergranular regions. • Rapid increment of coercivity and slight reduction in remanence are obtained. • Total rare-earth consumption is reduced simultaneously

  19. Structural and luminescence studies on Dy{sup 3+} doped lead boro–telluro-phosphate glasses

    Energy Technology Data Exchange (ETDEWEB)

    Selvi, S. [Department of Physics, Gandhigram Rural University, Gandhigram 624302 (India); Venkataiah, G. [Department of Physics, Sri Venkateswara University, Tirupati 517502 (India); Arunkumar, S.; Muralidharan, G. [Department of Physics, Gandhigram Rural University, Gandhigram 624302 (India); Marimuthu, K., E-mail: mari_ram2000@yahoo.com [Department of Physics, Gandhigram Rural University, Gandhigram 624302 (India)

    2014-12-01

    This paper reports results obtained on the structural and luminescence properties of Dy{sup 3+}doped lead boro−telluro-phosphate glasses prepared following the melt quenching technique. FTIR spectra exhibit the presence of B−O vibrations, P−O−P symmetric vibrations and Te−O stretching modes of TeO{sub 3} and TeO{sub 6} units. The metal–ligand bond was identified through UV−vis−NIR absorption spectra and to determine the band tailing parameter, direct and indirect band gap energy of the prepared glasses. The Judd−Ofelt (JO) intensity parameters (Ω{sub 2}, Ω{sub 4} and Ω{sub 6}), experimental and theoretical oscillator strengths were also determined and reported. Luminescence measurements were made to determine the transition probability (A), stimulated emission cross-section (σ{sub P}{sup E}) and branching ratio (β{sub R}) for the transitions that include {sup 4}F{sub 9/2}→{sup 6}H{sub 11/2}, {sup 6}H{sub 13/2} and {sup 6}H{sub 15/2} bands. The effect of Dy{sup 3+} ion concentration on the intensity ratio of yellow to blue emission bands has also been studied and reported. The lifetime corresponding to the {sup 4}F{sub 9/2} level of the title glasses has been found to decrease with the increase in Dy{sup 3+} ion concentration. The chromaticity coordinates (x,y) have been estimated from the luminescence spectra and the suitability of title glasses for white light applications has been analyzed using CIE chromaticity diagram. The variation of optical properties with the concentration of dysprosium oxide content in the glasses have been studied and reported.

  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. Therapeutical radiopharmaceuticals based In vivo generator system [166 Dy] Dy/166 Ho

    International Nuclear Information System (INIS)

    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 166 Dy Dy/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)

  2. Transition probabilities of Br II

    Science.gov (United States)

    Bengtson, R. D.; Miller, M. H.

    1976-01-01

    Absolute transition probabilities of the three most prominent visible Br II lines are measured in emission. Results compare well with Coulomb approximations and with line strengths extrapolated from trends in homologous atoms.

  3. Magnetic properties and XPS of Dy-Y and Dy-Nd alloys

    Institute of Scientific and Technical Information of China (English)

    戴闻; 沈保根; 李德新; 何文望; 叶小燕

    1996-01-01

    The magnetic properties and X-ray photoelectron spectroscopy (XPS) spectra in the Dy100-xYx and Dy100-zNdz rare-earth alloys are studied.The magnetism measurements show that the dhcp crystal-field influence in the Dy-Nd alloys,which tends to destroy the orbital moment,does not vanish even though a field of 6T is applied.With increasing Y (or Nd) content the temperature region corresponding to helical phase becomes wider (or narrower).The XPS records suggest that the property of the valence fluctuation in neodymium tends to increase the Fermi wave vector kF of the Dy-Nd alloys.This testifies that the abrupt dropping of the Neel temperature,as Nd is introduced,is not only due to a dilution effect of Nd.The introduction of light rare earths into heavy ones is favorable for suppressing the helical phase in the alloys and overcoming the negative magnetocaloric effect.This result will play a guiding role in designing composite magnetic refrigeration working substances.

  4. Radiative strength functions in 163,164Dy

    CERN Document Server

    Nyhus, H T; Guttormsen, M; Larsen, A C; rger, A Bü; Syed, N U H; Tveten, G M; Voinov, A; 10.1103/PhysRevC.81.024325

    2010-01-01

    The nuclei 163,164Dy have been investigated using the Oslo method on data from the pick-up reaction 164Dy(3He,alpha gamma)163Dy and the inelastic scattering 164Dy(3He,3He' gamma)164Dy, respectively. The radiative strength functions for both nuclei have been extracted, and a small resonance centered around Eg ?3 MeV is observed in both cases. The parameters of this so-called pygmy M1 resonance (the scissors mode) are compared to previous results on 160,161,162Dy using the Oslo method, and to data on 163Dy measured by the Prague group using the two-step cascade method. In particular, the integrated reduced transition probability B(M1) of the pygmy resonance is compared with neighboring dysprosium isotopes. We also observe an enhanced strength in the region above gamma energy around 5 MeV in 164Dy. Possible origins of this feature are discussed.

  5. Prospect of TbDyFe Magnetostrictive Material

    Institute of Scientific and Technical Information of China (English)

    2005-01-01

    1. Global Market: Increasing Demand for TbDyFe Mater There is steady demand for TbDyFe materials international market, especially in USA, Europe and Jap Following table shows global status of such materials si their emergence in 1984. Development course of American Etrema Company reflects the prospect of such materials. At present, besi domestic market, Etrema Company has sales subsidiarie

  6. Magnetic properties of Dy3+ ions and crystal field characterization in YF3:Dy3+ and DyF3 single crystals

    Science.gov (United States)

    Savinkov, A. V.; Korableva, S. L.; Rodionov, A. A.; Kurkin, I. N.; Malkin, B. Z.; Tagirov, M. S.; Suzuki, H.; Matsumoto, K.; Abe, S.

    2008-12-01

    The dc magnetic susceptibilities of the orthorhombic DyF3 single crystals have been measured in the temperature range between 1.8 and 300 K. The susceptibility along the b-axis does not depend on temperature below TC = 2.55 K and is equal to the demagnetizing factor of the sample, that gives evidence for the ferromagnetic phase induced by the magnetic dipole-dipole interactions between the Dy3+ ions. The saturation moment of 8.5 μB/Dy3+ along the b-axis was determined from magnetization measurements. The observed strong anisotropy of the magnetic susceptibility at low temperatures agrees with the measured anisotropic g-tensor of the ground state of impurity Dy3+ ions in YF3 single crystals. The results of measurements are interpreted in the frameworks of the crystal field theory and the mean magnetic field approximation.

  7. COLOR STABILITY OF NATURALLY DYED DENIM FABRICS

    Directory of Open Access Journals (Sweden)

    SUBTIRICA Adriana-Ioana

    2014-05-01

    Full Text Available The desire to colour textiles is as old as spinning and weaving. Natural dyes have been used since thousands of years for their long endurance, soft and elegant colours. But the invention of synthetic dyes has limited the application of natural dyes. The health hazards associated with the use of synthetic dyes and also the increased environmental awareness have revived the use of natural dyes during the recent years. The major performance characteristic of a dye is its ability to maintain the colour in normal use and is known as colorfastness. The study provides information regarding colour fastness properties of naturally dyed denim fabrics. Three vegetable materials were used for dyeing denim fabrics: Punica granatum (bark powder, Indigofera tinctoria (leave powder and Juglans regia (walnut dried shells. The results of the study indicated that using Walnut shells and Punica granatum deeper and more stable shades of colors are obtained in comparison with Indigofera Tinctoria dyed denim samples. All samples highlight a change in color in the sense of fading which has occurred to the highest extent when exposed to artificial light and washing. When tested against water, alkaline and acid perspiration, it is noticed that better results are obtained, and color change appear in a smaller extent.

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

    Indian Academy of Sciences (India)

    X F Wu; Y Kang; F F Wu; K Q Qiu; L K Meng

    2011-12-01

    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 successfully fabricated in the system with conventional Cu-mold casting method. Mg55Cu32Dy13, Mg60Cu27Dy13, Mg65Cu25Dy10 and Mg70Cu17Dy13 BMGs exhibit a clear glass transition, a broad supercooled liquid region and different crystallization and melting behaviours. They have supercooled liquid region ($\\Delta T_{x}$) from 41 K to 65 K, reduced glass transition temperature ($T_{rg}$) from 0.5363 to 0.5974 and parameter from 0.4038 to 0.4136. The shows a relatively good agreement with the GFA of the BGMs. On the other hand, a high fracture compressive strength of 624 MPa was obtained for Mg60Cu27Dy13 BMG.

  9. Search for superdeformed bands in {sup 154}Dy

    Energy Technology Data Exchange (ETDEWEB)

    Nisius, D.; Janssens, R.V.F.; Khoo, T.L. [and others

    1995-08-01

    The island of superdeformation in the vicinity of the doubly magic {sup 152}Dy yrast superdeformed (SD) band is thought to be well understood in the framework of cranked mean field calculations. In particular, the calculations suggested that in {sup 154}Dy there should be no yrast or near yrast SD minimum in the 40-60 h spin range, where SD bands in this mass region are thought to be {sup 153}Dy nucleus, it is populated. However, with the presence of five SD bands in the neighboring necessary to ascertain if the addition of one single neutron diminishes the importance of shell effects to the extent that superdeformation can no longer be sustained. In an experiment utilizing the increased resolving power of the early implementation phase of Gammasphere, the reaction {sup 122}Sn({sup 36}S,4n) at 165 MeV was employed to populate high spin states in {sup 154}Dy. In a four-day run with 36 detectors, over one billion triple and higher fold coincidence events were recorded. One new SD band was identified and was assigned to {sup 154}Dy. From comparisons with the Im{sup (2)} moments of inertia of the SD bands in {sup 152}Dy and {sup 153}Dy, a configuration based on (514)9/2{sup 2} neutrons coupled to the {sup 152}Dy SD core was proposed. One unexpected and as yet unexplained feature of this new SD band is that the transition energies are almost identical to those of an excited SD band in {sup 153}Dy. It is also worth noting that the feeding of the yrast states is similar to that achieved by the deexcitation from the ensemble of all entry states in the reaction. This observation emphasizes the statistical nature of the decay-out process. A paper reporting these results was accepted for publication.

  10. Sepp, Brüder

    OpenAIRE

    2009-01-01

    Vater der Brüder war Johann S. (* 24.6.1626 Kaltern/Südtirol [Caldaro/I], † zw. 1679/84 Schlanders/Südtirol [Silandro/I]). Paul (Paolo): * 1649 Kaltern/Südtirol (Caldaro/I), † April 1670 Bozen/Südtirol (Bolzano/I) oder 1692 Kaltern. Sänger, Komponist, Organist.

  11. Excited quasiparticles and entropy in 161,162Dy

    Science.gov (United States)

    Razavi, R.; Mohassel, A. Rashed; Mohammadi, S.

    2015-11-01

    In this paper, the nuclear level densities of 161,162Dy is studied by the use of a microscopic theory which includes nuclear pairing interaction. It is based on the modified harmonic oscillator model according to the Nilsson potential. The entropy of even-odd and even-even nuclei as a function of nuclear temperature is obtained. The entropy excess of 161Dy is compared with that of 162Dy. It is concluded that the difference is related to the entropy carried by the neutron hole coupled to the even-even core. The numbers of excited quasiparticles are calculated. Good agreement was observed between calculated results and the experimental data.

  12. A new method of making 164Dy metal plate targets

    Science.gov (United States)

    Sugai, Isao; Kato, Hajime

    1986-04-01

    164Dy metal plate targets of high purity for measurements of the electron neutrino mass were made successfully. The starting material 164DyF 3 was reduced to metal by the Ca reduction method with rf induction heating. The reduced metal was pressed with a hot-press device in argon gas atmosphere and rolled into plates of 35 mm × 10 mm in area by a new method of packing. The thicknesses were in the range from 150 to 230 mg/cm 2. The present method was also found suitable to make thin Dy targets of the order of 1 mg/cm 2 in thickness

  13. Probing Dy{sup 3+} magnetic moments in multiferroic perovskite DyMnO{sub 3} by optical spectroscopy

    Energy Technology Data Exchange (ETDEWEB)

    Kashchenko, M.A. [Institute of Spectroscopy, Russian Academy of Sciences, Troitsk, Moscow (Russian Federation); Moscow Institute of Physics and Technology (State University), Dolgoprudnyi (Russian Federation); Klimin, S.A.; Popova, M.N. [Institute of Spectroscopy, Russian Academy of Sciences, Troitsk, Moscow (Russian Federation); Balbashov, A.M. [Moscow Power Engineering Institute (Technical University), Moscow (Russian Federation)

    2016-06-15

    We present a detailed temperature-dependent (4-300 K) spectroscopic study of DyMnO{sub 3} single crystals with distorted perovskite structure. Energies of 36 crystal-field levels of Dy{sup 3+} in paramagnetic DyMnO{sub 3} were determined. The Dy{sup 3+} ground Kramers doublet does not split at T{sub N}{sup Mn} = 39 K and splits below T{sub lock} = 18 K. The splitting grows fast at temperatures near T{sub N}{sup Dy} = 6.5 K and reaches Δ{sub 0} ∼ 11 ± 2 cm{sup -1} at 4 K. Using the experimental temperature dependence Δ{sub 0}(T), we calculate the dysprosium magnetic moment m{sub Dy}(T) and the dysprosium contribution into specific heat and magnetic susceptibility. Analysing all the experimental data, we conclude that the Dy-Mn interaction is of the Dzyaloshinskii-Moriya type. (copyright 2016 WILEY-VCH Verlag GmbH and Co. KGaA, Weinheim)

  14. Underground-brändien rakentuminen

    OpenAIRE

    Hänninen, Johanna

    2010-01-01

    Markkinajohtajuudesta eri toimialoilla taistelevat usein suuret ja kauan toiminnassa olleet brändit, joiden haastaminen saattaa olla vaikeaa. Brändinrakennus kannattaakin suunnata näiden suurien brändien väliin jääviin tyhjiin markkinarakoihin. Yksi esimerkki tällaisesta hyvin hyödynnetystä markkinaraosta ovat underground-brändit, joiden brändinrakennuksen lähtökohtana ei ole kilpailla toimialan suurien brändien kanssa, vaan hallita omaa markkinarakoaan kohdennetulla tarjonnallaan. Niiden tav...

  15. First observation of the decay Bs --> Ds K and measurement of the ratio of branching fractions Br(Bs --> DsK)/Br(Bs --> Ds pi)

    CERN Document Server

    Abulencia, A; Adelman, J; Akimoto, T; Albrow, M G; Alvarez Gonzalez, B; Amerio, S; Amidei, D; Anastassov, A; Annovi, A; Antos, J; Apollinari, G; Apresyan, A; Arisawa, T; Artikov, A; Ashmanskas, W; Attal, A; Aurisano, A; Azfar, F; Azzurri, P; Badgett, W; Barbaro-Galtieri, A; Barnes, V E; Barnett, B A; Bartsch, V; Bauer, G; Beauchemin, P H; Bedeschi, F; Bednar, P; Beecher, D; Behari, S; Bellettini, G; Bellinger, J; Benjamin, D; Beretvas, A; Beringer, J; Bhatti, A; Binkley, M; Bisello, D; Bizjak, I; Blair, R E; Blocker, C; Blumenfeld, B; Bocci, A; Bodek, A; Boisvert, V; Bölla, G; Bortoletto, D; Boudreau, J; Boveia, A; Brau, B; Bridgeman, A; Brigliadori, L; Bromberg, C; Brubaker, E; Budagov, Yu; Budd, H S; Budd, S; Burkett, K; Busetto, G; Bussey, P; Buzatu, A; Byrum, K L; Cabrera, S; Calancha, C; Campanelli, M; Campbell, M; Canelli, F; Canepa, A; Carlsmith, D; Carosi, R; Carrillo, S; Carron, S; Casal, B; Casarsa, M; Castro, A; Catastini, P; Cauz, D; Cavaliere, V; Cavalli-Sforza, M; Cerri, A; Cerrito, L; Chang, S H; Chen, Y C; Chertok, M; Chiarelli, G; Chlachidze, G; Chlebana, F; Cho, K; Chokheli, D; Chou, J P; Choudalakis, G; Chuang, S H; Chung, K; Chung, W H; Chung, Y S; Ciobanu, C I; Ciocci, M A; Clark, A; Clark, D; Compostella, G; Convery, M E; Conway, J; Copic, K; Cordelli, M; Cortiana, G; Cox, D J; Crescioli, F; Cuenca-Almenar, C; Cuevas-Maestro, J; Culbertson, R; Cully, J C; Dagenhart, D; Datta, M; Davies, T; De Barbaro, P; De Cecco, S; Deisher, A; De Lorenzo, G; Dell'Orso, Mauro; Deluca, C; Demortier, L; Deng, J; Deninno, M; Derwent, P F; di Giovanni, G P; Dionisi, C; Di Ruzza, B; Dittmann, J R; D'Onofrio, M; Donati, S; Dong, P; Donini, J; Dorigo, T; Dube, S; Efron, J; Elagin, A; Erbacher, R; Errede, D; Errede, S; Eusebi, R; Fang, H C; Farrington, S; Fedorko, W T; Feild, R G; Feindt, M; Fernández, J P; Ferrazza, C; Field, R; Flanagan, G; Forrest, R; Franklin, M; Freeman, J C; Furic, I; Gallinaro, M; Galyardt, J; Garberson, F; García, J E; Garfinkel, A F; Genser, K; Gerberich, H; Gerdes, D; Gessler, A; Giagu, S; Giakoumopoulou, V; Giannetti, P; Gibson, K; Gimmell, J L; Ginsburg, C M; Giokaris, N; Giordani, M; Giromini, P; Giunta, M; Giurgiu, G; Glagolev, V; Glenzinski, D; Gold, M; Goldschmidt, N; Golossanov, A; Gómez, G; Gómez-Ceballos, G; Goncharov, M; González, O; Gorelov, I; Goshaw, A T; Goulianos, K; Gresele, A; Grinstein, S; Grosso-Pilcher, C; Group, R C; Grundler, U; Guimarães da Costa, J; Gunay-Unalan, Z; Haber, C; Hahn, K; Hahn, S R; Halkiadakis, E; Han, B Y; Han, J Y; Handler, R; Happacher, F; Hara, K; Hare, D; Hare, M; Harper, S; Harr, R F; Harris, R M; Hartz, M; Hatakeyama, K; Hauser, J; Hays, C; Heck, M; Heijboer, A; Heinemann, B; Heinrich, J; Henderson, C; Herndon, M; Heuser, J; Hewamanage, S; Hidas, D; Hill, C S; Hirschbuehl, D; Höcker, A; Hou, S; Houlden, M; Hsu, S C; Huffman, B T; Hughes, R E; Husemann, U; Huston, J; Incandela, J; Introzzi, G; Iori, M; Ivanov, A; James, E; Jayatilaka, B; Jeon, E J; Jha, M K; Jindariani, S; Johnson, W; Jones, M; Joo, K K; Jun, S Y; Jung, J E; Junk, T R; Kamon, T; Kar, D; Karchin, P E; Kato, Y; Kephart, R; Keung, J; Khotilovich, V; Kilminster, B; Kim, D H; Kim, H S; Kim, J E; Kim, M J; Kim, S B; Kim, S H; Kim, Y K; Kimura, N; Kirsch, L; Klimenko, S; Knuteson, B; Ko, B R; Koay, S A; Kondo, K; Kong, D J; Konigsberg, J; Korytov, A; Kotwal, A V; Kreps, M; Kroll, J; Krop, D; Krumnack, N; Kruse, M; Krutelyov, V; Kubo, T; Kuhr, T; Kulkarni, N P; Kurata, M; Kusakabe, Y; Kwang, S; Laasanen, A T; Lami, S; Lammel, S; Lancaster, M; Lander, R L; Lannon, K; Lath, A; Latino, G; Lazzizzera, I; LeCompte, T; Lee, E; Lee, H S; Lee, S W; Leone, S; Lewis, J D; Lin, C S; Linacre, J; Lindgren, M; Lipeles, E; Lister, A; Litvintsev, D O; Liu, C; Liu, T; Lockyer, N S; Loginov, A; Loreti, M; Lovas, L; Lu, R S; Lucchesi, D; Lueck, J; Luci, C; Lujan, P; Lukens, P; Lungu, G; Lyons, L; Lys, J; Lysak, R; Lytken, E; Mack, P; MacQueen, D; Madrak, R; Maeshima, K; Makhoul, K; Mäki, T; Maksimovic, P; Malde, S; Malik, S; Manca, G; Manousakis-Katsikakis, A; Margaroli, F; Marino, C; Marino, C P; Martin, A; Martin, V; Martínez, M; Martinez-Ballarin, R; Maruyama, T; Mastrandrea, P; Masubuchi, T; Mattson, M E; Mazzanti, P; McFarland, K S; McIntyre, P; McNulty, R; Mehta, A; Mehtälä, P; Menzione, A; Merkel, P; Mesropian, C; Miao, T; Miladinovic, N; Miller, R; Mills, C; Milnik, M; Mitra, A; Mitselmakher, G; Miyake, H; Moggi, N; Moon, C S; Moore, R; Morello, M J; Morlok, J; Movilla-Fernández, P A; Mülmenstädt, J; Mukherjee, A; Müller, T; Mumford, R; Murat, P; Mussini, M; Nachtman, J; Nagai, Y; Nagano, A; Naganoma, J; Nakamura, K; Nakano, I; Napier, A; Necula, V; Neu, C; Neubauer, M S; Nielsen, J; Nodulman, L; Norman, M; Norniella, O; Nurse, E; Oakes, L; Oh, S H; Oh, Y D; Oksuzian, I; Okusawa, T; Orava, R; Österberg, K; Pagan Griso, S; Pagliarone, C; Palencia, E

    2008-01-01

    A combined mass and particle identification fit is used to make the first observation of the decay Bs --> Ds K and measure the branching fraction of Bs --> Ds K relative to Bs --> Ds pi. This analysis uses 1.2 fb^-1 integrated luminosity of pbar-p collisions at sqrt(s) = 1.96 TeV collected with the CDF II detector at the Fermilab Tevatron collider. We observe a Bs --> Ds K signal with a statistical significance of 8.1 sigma and measure Br(Bs --> Ds K)/Br(Bs --> Ds pi) = 0.097 +- 0.018(stat) +- 0.009(sys).

  16. Crystal structure of ∼RCu3S3 and ∼RCuTe2 (R=Gd-Lu) compounds

    Science.gov (United States)

    Gulay, L. D.; Daszkiewicz, M.; Shemet, V. Ya.

    2012-02-01

    The crystal structures of ternary compounds TbCu3S3, Dy1.06Cu2.84S3 (space group R3¯), Ho0.67Cu2S2 (space group P3¯m1), ErCu3S3 (space group P3¯1c), Yb0.80Cu1.60S2, Lu0.67Cu2S2, TbCuTe2, DyCuTe2, Tm1.07Cu0.78Te2, LuCuTe2 (space group P3¯m1), Gd0.75Cu1.74Te2 (space group P3¯1m) were determined by means of X-ray single crystal diffraction. The S(Te) atoms are stacked in a close packed arrangement with the layers in the sequence AB. The R atoms are distributed over octahedral interstices whereas Cu atoms are located in tetrahedral interstices. Disorder of R and Cu atoms in studied chalcogenides is found. Crystal structure comparison showed that TbCuTe2 and DyCuTe2 crystallize as superstructure 2a×2a×2c to CaAl2Si2 structure type, whereas Gd0.75Cu1.74Te2, ErCu3S3 and TbCu3S3 (Dy1.06Cu2.84S3) have superstructure √3a×√3a×nc with n=1, 2, 3.

  17. Green Non-dyed Textile Innovation Alliance officially launched

    Institute of Scientific and Technical Information of China (English)

    2012-01-01

    June 29, the Green Non-dyed Textile Innovation Alliance was officially launched by the China Textile Information Center, Nationa Textile Product Development Center together with China Chemical Fiber Industry Association

  18. Search for excited superdeformed bands in {sup 151}Dy

    Energy Technology Data Exchange (ETDEWEB)

    Nisius, D.; Janssens, R.V.F.; Crowell, B. [and others

    1995-08-01

    Following the first report of superdeformed (SD) bands with identical transition energies in the pairs ({sup 151}Tb*,{sup 152}Dy), ({sup 150}Gd*, {sup 151}Tb) and ({sup 153}Dy*, {sup 152}Dy) (where * denotes an excited SD band), it was proposed by Nazarewicz et al. that the observations could be understood in a strong-coupling approach if pseudo SU(3) symmetry were invoked. In this model there are three limiting values of the decoupling parameter; i.e. a = 0, {plus_minus}1. In the first two cases mentioned above the pairs of bands have nearly identical transition energies and are interpreted as proton excitations involving the [200]1/2 pseudospin orbital coupled to the {sup 152}Dy core, for which the value of the decoupling parameter is calculated to be a =+1.

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

    Indian Academy of Sciences (India)

    A Ansari; H L Yadav; M Kaushik; U R Jakhar

    2003-06-01

    In view of recent experimental progress on production and spectroscopy of neutron-rich isotopes of Dy with mass number = 166 and 168, we have made theoretical investigations on the structure of high spin states of 164-170Dy isotopes in the cranked Hartree–Fock–Bogoliubov (CHFB) theory employing a pairing+quadrupole+hexadecapole model interaction. With the increase of neutron number the rotation alignment of the proton orbitals dominates the structure at high spins, which is clearly reflected in the spin dependence of the rotational g-factors. A particularly striking feature is the difference in the spin-dependent properties of 166Dy as compared to that of 164Dy.

  20. An oxygen-sensitive luminescent Dy(iii) complex.

    Science.gov (United States)

    Nakai, Hidetaka; Seo, Juncheol; Kitagawa, Kazuhiro; Goto, Takahiro; Matsumoto, Takahiro; Ogo, Seiji

    2016-06-21

    This paper presents the first dysprosium(iii) complex, [{((MeMe)ArO)3tacn}Dy(III)(THF)] (1(Dy)), that shows oxygen-sensitive luminescence. The synthesis, structure and oxygen-sensitive luminescence properties of 1(Dy) are reported (Φ = 0.050 and τ = 17.7 μs under N2, Φ = 0.011 and τ = 4.1 μs under O2 and KSV = 305 M(-1) in THF; KSV = 0.0077%(-1) in polystyrene film). The oxygen sensitive mechanism of 1(Dy) is discussed based on the photophysical properties of the corresponding gadolinium(iii) complex, [{((MeMe)ArO)3tacn}Gd(III)(THF)]. PMID:27191980

  1. Luminescence studies of Dy3+ doped bismuth zinc borate glasses

    International Nuclear Information System (INIS)

    Glasses having composition of (100−x) (1Bi2O3–1ZnO–1B2O3)-xDy2O3 (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 Dy3+ 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 Dy3+ ions whereas non exponential behaviour is observed for 2 mol% of Dy3+ 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 Dy3+ ion. • The interaction between Dy3+ ions is of dipole–dipole type. • CIE chromaticity coordinates fall within the white light region

  2. Electrochemical investigation on the formations of Dy-Ni alloy films in dimethyl formamide

    Institute of Scientific and Technical Information of China (English)

    2002-01-01

    The electrochemical properties of Dy(III), Ni(II) and Dy(III)+ Ni(II) in dimethylformamide were studied by cyclic voltammetry on Pt or Cu electrode . Black, metallic lustered, compact and well adhesive Dy-Ni alloy films can be co-deposited on Cu electrode by sweeping-potential-deposition method within some potentials. SEM, EDAX and XRD were used to analyze the alloy films. The Dy content in the Dy-Ni alloy film is up to 56.91%(mass fraction) and the Dy-Ni alloy films are amorphous.

  3. Yrityksen brändin uudistaminen

    OpenAIRE

    Saarimaa, Petri

    2015-01-01

    Brändin rakentaminen on tänä päivänä tärkeä osa yrityksen näkyvyyden ja kilpailukyvyn edistämisessä. Huolellisesti rakennetulla brändillä ja hyvällä markkinoinnilla yritys voi erottua kilpailijoistaan positiivisesti. Tie menestyvään brändiin on kuitenkin pitkä prosessi. Toimeksiantajana opinnäytetyössä toimi rakennusyritys Rakennus Vuoriot Oy. Opinnäytetyön tavoitteena oli toteuttaa yritykselle brändin uudistaminen luomalla kokonaan uusi perusta ja rakennusosat olemassa olevalle brändille...

  4. BR2 reactor neutron beams

    International Nuclear Information System (INIS)

    The use of reactor neutron beams is becoming increasingly more widespread for the study of some properties of condensed matter. It is mainly due to the unique properties of the ''thermal'' neutrons as regards wavelength, energy, magnetic moment and overall favorable ratio of scattering to absorption cross-sections. Besides these fundamental reasons, the impetus for using neutrons is also due to the existence of powerful research reactors (such as BR2) built mainly for nuclear engineering programs, but where a number of intense neutron beams are available at marginal cost. A brief introduction to the production of suitable neutron beams from a reactor is given. (author)

  5. Isothermal section of Dy-Zr-Si ternary system at 773 K

    Institute of Scientific and Technical Information of China (English)

    2012-01-01

    The isothermal section of the phase diagram of the Dy-Zr-Si ternary system at 773 K was determined by X-ray diffraction (XRD) analysis, metallographic analysis, and scanning electron microscopy (SEM) with energy-dispersive spectrometer (EDS) analysis. The isothermal section consists of 13 single-phase regions, 23 two-phase regions, and 11 three-phase regions. The solubilities of Zr in Dy, Dy5Si4, Dy5Si3, DySi, DySi2, DySi1.67, and Dy in Zr, Zr2Si, Zr3Si2, Zr5Si4, ZrSi, and ZrSi2 were determined at 773 K.

  6. Z + {gamma} cross-section measurement, {sigma}*BR(Z + {gamma}), in the electron channel for p{bar p} collisions at {radical}s = 1.8 TeV, and limits for the ZZ{gamma} and Z{gamma}{gamma} anomalous couplings

    Energy Technology Data Exchange (ETDEWEB)

    Roach-Bellino, M.

    1994-02-01

    The Z + {gamma} 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 {plus_minus} 0.28 pb{sup {minus}1}. Two Z{gamma} candidates are observed from central photon events with {Delta}R/{sub {gamma}} > 0.7 and E{sub t}{sup {gamma}} > 5.0 GeV. From these events the {sigma} * BR(Z + {gamma}) is measured and compared with SM predictions: {sigma} * BR(Z + {gamma}){sub e} = 6.8{sub {minus}5.7}{sup +5.7}(stat + syst)pb {sigma} * BR(Z + {gamma})SM = 4.7{sub {minus}4.7}{sup +0.7}(stat + syst)pb. From this ZZ{sub {gamma}} cross section measurement limits on the Z{sub {gamma}{gamma}} and couplings for three different choices of compositeness scale {Lambda}{sub Z} are obtained. The experimental sensitivity to the h{sub 30}{sup Z,{gamma}}/h{sub 10}{sup Z,{gamma}} couplings is in the range of {Lambda}{sub Z} {approximately} 450--500 GeV and for the h{sub 40}{sup Z{gamma}}/h{sub 20}{sup Z,{gamma}} couplings {Lambda}{sub Z} {approximately} 300 GeV.

  7. 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

    International Nuclear Information System (INIS)

    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+5.7(stat + syst)pb σ * BR(Z + γ)SM = 4.7-4.7+0.7(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 h40Zγ/h20Z,γ couplings ΛZ ∼ 300 GeV

  8. 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.

  9. Thermodynamic Optimization of DyCl3 -NaCl System

    Institute of Scientific and Technical Information of China (English)

    叶信宇; 孙益民; 张静; 谈君君

    2005-01-01

    In this paper, the phase diagram of the DyCl3 -NaCl system is optimized and calculated with CALPHAD ( calculation of phase diagram ) technology. A set of thermodynamic functions of compounds Na3 DyCl6, NaDyCl4, and NaDY2 Cl7 have been optimized and calculated based on an interactive computer-assisted analysis. The optimized thermodynamic parameters, calculated phase diagram and experimental phase diagram are thermodynamically serf-consistent.

  10. Investigations of the effect of nonmagnetic Ca substitution for magnetic Dy on spin-freezing in Dy2Ti2O7

    Science.gov (United States)

    Anand, V. K.; Tennant, D. A.; Lake, B.

    2015-11-01

    Physical properties of partially Ca substituted hole-doped Dy2Ti2O7 have been investigated by ac magnetic susceptibility {χ\\text{ac}}(T) , dc magnetic susceptibility χ (T) , isothermal magnetization M(H) and heat capacity {{C}\\text{p}}(T) measurements on Dy1.8Ca0.2Ti2O7. The spin-ice system Dy2Ti2O7 exhibits a spin-glass type freezing behavior near 16 K. Our frequency dependent {χ\\text{ac}}(T) data of Dy1.8Ca0.2Ti2O7 show that the spin-freezing behavior is significantly influenced by Ca substitution. The effect of partial nonmagnetic Ca2+ substitution for magnetic Dy3+ is similar to the previous study on nonmagnetic isovalent Y3+ substituted Dy2-x Y x Ti2O7 (for low levels of dilution), however the suppression of spin-freezing behavior is substantially stronger for Ca than Y. The Cole-Cole plot analysis reveals semicircular character and a single relaxation mode in Dy1.8Ca0.2Ti2O7 as for Dy2Ti2O7. No noticeable change in the insulating behavior of Dy2Ti2O7 results from the holes produced by 10% Ca2+ substitution for Dy3+ ions.

  11. Luminescence and ESR Studies of CaS:Dy Phosphor

    Institute of Scientific and Technical Information of China (English)

    Vijay Singh; ZHU Jun-Jie; T.K.Gundu Rao; Manoj Tiwari; PAN Hong-Cheng

    2005-01-01

    @@ CaS phosphor activated with Dy ions is prepared by the solid-state diffusion method. The phosphor is characterized by x-ray powder diffraction, thermogravimetric analysis and photoluminescence. Defect centres formed in CaS:Dy are studied using the technique of electron spin resonance. The thermoluminescence glow curve shows peaks at around 117℃ and 345℃ . Irradiated CaS:Dy exhibits ESR lines due to defect centres. The thermal annealing behaviour of one of the defect centres appears to correlate with the TL peaks at 117℃ and 345℃.This centre is characterized by an isotropic g-value of 2.0035 and is assigned to an F+ centre.

  12. Phase diagram of the CsBr-CaBr2 system

    Institute of Scientific and Technical Information of China (English)

    BAO Xinhua; CHEN Nianyi; LU Wencong; CHENG Zhixuan; LUO Yunyun; LU Weiying; XIA Yiben

    2006-01-01

    The phase diagram of the CsBr-CaBr2 system was re-determined by using differential thermal analysis and high temperature and room temperature X-ray diffraction analysis. It is concluded that there are three intermediate compounds in this system: a congruently melting compound, CsCaBr3, with a melting point of 823℃ and two incongruently melting compounds, Cs2CaBr4 and Cs3Ca2Br7, whose peritectic points being 597℃ and 635℃, respectively. X-ray diffraction analysis indicated that compound CsCaBr3 is of slightly distorted perovskite structure.

  13. Miten brändi säilyttää brändiarvonsa?

    OpenAIRE

    Sara, Maria

    2015-01-01

    Tässä opinnäytetyössä tarkasteltiin brändiä ja sen ylläpitämistä. Tavoitteena oli selvittää, miten brändi voi säilyttää jo saavuttamansa brändiarvon. Brändillä tarkoitetaan tavaramerkin ympärille muodostunutta positiivista mielikuvaa. Yrityksen kannalta brändi on kilpailukeino. Vahvan brändin etuja yritykselle ovat esimerkiksi uskolliset asiakkaat, haluttavuus yhteistyökumppanina ja kiinnostavuus työnantajana. Aihe valittiin työn tekijän oman kiinnostuksen perusteella. Aihetta tarkastelti...

  14. Punkaliven brändiohjeisto

    OpenAIRE

    Vikiö, Timo

    2010-01-01

    Tässä opinnäytetyössä käsitellään brändiohjeiston rakentamista pk-yritys Punkalivelle, joka valmistaa designkalusteita ja paviljonkeja Finnforestin kehittämästä Kerto®-puumateriaalista. Yrityksen strategisena lähtökohtana on ollut rakentaa uutta yritys-trendiä, joka ottaa huomioon nykypäivän vaativan kuluttajan ja on kiinnostunut kestä-vän kehityksen arvoista. Opinnäytetyön tavoitteena on ollut kartoittaa kestävän kehityksen käsitettä, siihen liit-tyviä tekijöitä niin viestinnässä kuin mu...

  15. 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.

  16. 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)

  17. Laser Pyrolysis of CH3Br

    OpenAIRE

    Chang, Hua,; Hsieh, Jang Ching

    1993-01-01

    Laser pyrolysis of CH3Br by a strong laser irradiation was studied in this work. Besides a fine needle of solid carbon was deposited at the surface on the substrate, HBr and CH4, were found as gaseous products with a ratio of 2:1. Small amount of C2H2 was also detected. The variation in the pressures of CH3Br, HBr and CH4 were measured by Raman spectroscopy. It indicated that the decomposition of CH3Br was first order with respect to CH3Br. The reaction mechanism of the laser pyrolysis was su...

  18. Sokos Herkun brändimielikuva nuorten silmissä brändiarvojen perusteella mitattuna

    OpenAIRE

    Lappalainen, Sanna

    2016-01-01

    Tämä opinnäytetyö tehtiin Tampereen keskustassa sijaitsevalle Sokos Herkku ruokakaupalle. Opinnäytetyöni käsittelee brändin rakentamista ja brändimielikuvan muodostumista. Teoriaosiossa käydään läpi brändin rakentaminen brändi-identiteetin luomisesta brändin johtamiseen brändipääomalla. Teoriaosiossani katsotaan brändiä myös palvelubrändin näkökulmasta, sillä elintarvikekaupat ovat yhä kasvavassa määrin palveluyrityksiä. Tutkimuksen tavoitteena oli kehittää Sokos Herkun brändimielikuvaa n...

  19. Mechanical and corrosion properties of binary Mg-Dy alloys for medical applications

    Energy Technology Data Exchange (ETDEWEB)

    Yang Lei, E-mail: lei.yang@hzg.de [Helmholtz-Zentrum Geesthacht, Institute of Materials Research, Max-Planck-Str. 1, D-21502 Geesthacht (Germany); Huang Yuanding; Peng Qiuming; Feyerabend, Frank; Kainer, Karl Ulrich; Willumeit, Regine; Hort, Norbert [Helmholtz-Zentrum Geesthacht, Institute of Materials Research, Max-Planck-Str. 1, D-21502 Geesthacht (Germany)

    2011-12-15

    Microstructure, mechanical and corrosion properties of binary magnesium-dysprosium (Mg-5, 10, 15, 20 wt.% Dy) alloys were investigated for medical applications. In the as-cast condition, the distribution of Dy is quite inhomogeneous. Mg-10Dy alloy exhibits a moderate tensile and compression yield strength, and the best elongation and corrosion resistance. After T4 (solutionizing) treatment, the distribution of Dy becomes homogeneous. The tensile and compression yield strength of all Mg-Dy alloys decreases. The elongation remains unchanged, while the corrosion resistance is largely improved after T4 treatment.

  20. Electrodeposited RE-TM (RE=Dy,Nd, Eu; TM =Co)Alloy Films and Their Magnetic Properties%电沉积RE-TM(RE=Dy,Nd,Eu;TM=Co)合金膜及其磁性质

    Institute of Scientific and Technical Information of China (English)

    范必强; 赖恒; 李加新; 黄志高

    2011-01-01

    在353 K的尿素-乙酰胺-NaBr-KBr熔体中,用恒电位电解法在Cu基片上制备了稀土RE(Dy,Nd,Eu)-铁族TM(Co)合金膜.利用循环伏安法研究了熔体的电化学行为.电化学实验结果表明,在Pt电极上,Co(Ⅱ)+2e→Co(0)是一步完全的不可逆反应,并测得Co(Ⅱ)在Pt电极上的传递系数a以及扩散系数D0.稀土元素(Dy,Nd,Eu)难以被单独沉积,但能被Co(Ⅱ)诱导共沉积.用EDS分析合金膜的成分及含量.用XRD和振动样品磁强计(VSM)分析样品退火前后的晶相和磁性能变化特征.实验结果表明,合金膜的表面形貌和磁性与其成分组成及沉积电位紧密相关,且稀土离子的被诱导能力取决于稀土与铁族原子之间的电负性差值.%Rare earth ( RE = Dy,Nd,Eu) -3d transition metal ( TM = Co) alloy films were codeposited on copper substrate in urea - acetarnide - NaBr - KBr melt at 355K. The cyclic voltammetry was used to study the electrochemical behavior,showing that the electroreduction of TM was irreversible in one step. The transfer coefficient a and the diffusion coefficient DO of Co2+ were measured. RE3+ could not be reduced alone, but it could be inductively codeposited with Co2+ . The composition of films was analyzed by EDS; the crystalline phases were investigated by XRD; the microstructures were observed by SEM;and the magnetic properties were measured by VSM. The experimental results reveal that, the surface morphologies and the magnetic properties of the RE - TM alloy films depend strongly on the composition and electrodeposition potential, furthermore the RE - induced codeposition ability is dominated by the electronegativity difference between RE and TM atoms.

  1. Effect of B³⁺-N³⁻ on YAG:Dy thermographic phosphor luminescence.

    Science.gov (United States)

    Kwong, Wing Yin; Steinberg, Adam; Chin, Ya Huei

    2014-11-01

    The use of thermographic phosphors for high-temperature (>1000  K) thermometry currently is limited by loss of signal due to thermal quenching. This work demonstrates a new phosphor generated by substituting tetrahedral site Al(3+)-O(2-) in YAG:Dy with B(3+)-N(3-) to produce YABNG:Dy. Conventional YAG:Dy and YABNG:Dy phosphors were synthesized using identical solgel synthesis techniques. X-ray diffraction measurements showed that both had nearly pure crystalline phases, with a minor secondary yttrium-aluminum-monoclinic (YAM) phase present in the YABNG:Dy. The YABNG:Dy sample had a larger and more spherical primary grain than did the YAG:Dy in scanning electron microscopy images. Tests of the thermal response showed that the YABNG:Dy had much stronger phosphorescence emissions than did YAG:Dy, likely due to the morphological differences. Furthermore, the onset of thermal quenching was delayed by approximately 100 K for YABGN:Dy compared to YAG:Dy, and the rate of signal decrease with temperature was reduced. This resulted in greater signal-to-noise ratios and less uncertainty in the temperature measurements, particularly at high temperatures. PMID:25361305

  2. MoDySim - A parallel dynamical UMTS simulator

    NARCIS (Netherlands)

    Fleuren, M.J.; Stüben, H.; Zegwaard, G.F.

    2004-01-01

    UMTS is a third generation mobile telecommunication system, which enables multi-service and multi-bit rate communication going beyond the possibilities of previous systems. The simulator MoDySirn models UMTS in great detail. Characteristics of UMTS, such as soft hand-over and the interdependency of

  3. EST Table: DY231350 [KAIKOcDNA[Archive

    Lifescience Database Archive (English)

    Full Text Available DY231350 EST02101 10/09/28 99 %/227 aa ref|NP_001037309.1| vitellogenin precursor [...s: Precursor dbj|BAA02444.1| vitellogenin precursor [Bombyx mori] dbj|BAA06397.1| vitellogenin [Bombyx mori

  4. 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

  5. Surface activation of dyed fabric for cellulase treatment.

    Science.gov (United States)

    Schimper, Christian B; Ibanescu, Constanta; Bechtold, Thomas

    2011-10-01

    Surface activation of fabric made from cellulose fibres, such as viscose, lyocell, modal fibres and cotton, can be achieved by printing of a concentrated NaOH-containing paste. From the concentration of reducing sugars formed in solution, an increase in intensity of the cellulase hydrolysis by a factor of six to eight was observed, which was mainly concentrated at the activated parts of the fabric surface. This method of local activation is of particular interest for modification of materials that have been dyed with special processes to attain an uneven distribution of dyestuff within the yarn cross-section, e.g., indigo ring-dyed denim yarn for jeans production. Fabrics made from regenerated cellulose fibres were used as model substrate to express the effects of surface activation on indigo-dyed material. Wash-down experiments on indigo-dyed denim demonstrated significant colour removal from the activated surface at low overall weight loss of 4-5%. The method is of relevance for a more eco-friendly processing of jeans in the garment industry.

  6. Studies of normal deformation in {sup 151}Dy

    Energy Technology Data Exchange (ETDEWEB)

    Nisius, D.; Janssens, R.V.F.; Crowell, B. [and others

    1995-08-01

    The wealth of data collected in the study of superdeformation in {sup 151}Dy allowed for new information to be obtained on the normally deformed structures in this nucleus. At high spin several new yrast states have been identified for the first time. They were associated with single-particle excitations. Surprisingly, a sequence was identified with energy spacings characteristic of a rotational band of normal ({beta}2 {approximately} 0.2) deformation. The bandhead spin appears to be 15/2{sup -} and the levels extend up to a spin of 87/2{sup -}. A clear backbend is present at intermediate spins. While a similar band based on a bandhead of 6{sup +} is known in {sup 152}Dy, calculations suggest that this collective prolate band should not be seen in {sup 151}Dy. In the experiment described earlier in this report that is aimed at determining the deformations associated with the SD bands in this nucleus and {sup 152}Dy, the deformation associated with this band will be determined. This will provide further insight into the origin of this band.

  7. Determination of two reactive dyes concentration in dyed cotton fabric

    Directory of Open Access Journals (Sweden)

    Miljković Milena

    2012-01-01

    Full Text Available The purpose of this paper was to determine the unknown concentration of dichlortriazinyl reactive dyes, namely Reactive Yellow 22 and Reactive Blue 163, in dyed cotton fabric. The samples of cotton fabric were dyed individually with each dye as well as with a mixture of two dyes. The unknown concentrations of dyes were determined by measuring the corresponding reflectance values of dyed fabric samples and then using the relation between the concentration and reflectance values of the samples. The method set by Kubelka and Munk was used. The accuracy and repeatability of the concentrations determination were calculated by the statistical processing of the data obtained by measurements. Relative errors of individual determination of Reactive Yellow 22 and Reactive Blue 163 were 3.66% and 5.94% respectively. Relative errors in determination of Reactive Yellow 22 and Reactive Blue 163 in a mixture were 3.47% and 3.19% respectively. The results showed that reflectance spectrophotometry can be successfully used as the method for concentration determination of Reactive Yellow 22 and Reactive Blue 163 in dyed cotton fabric and can therefore be applied as the shade control method in dyeing.

  8. Study of evaporation processes in Dy - Pd system

    Energy Technology Data Exchange (ETDEWEB)

    Zajtsev, A.I.; Priselkov, Yu.A.; Nesmeyanov, A.N. (Moskovskij Gosudarstvennyj Univ. (USSR))

    Disprosium and palladium vapor pressure above Dy-Pd alloys in the 0-80 at.% concentration range is measured using the integral variant of the Knudsen effusive method in ultrahigh oilless vacuum. Temperature dependences of vapor pressure are calculated along with partial and integral thermodynamic functions according to the data obtained. The results are in a good agreement with the system constitution diagram.

  9. Using polyvinyl chloride dyed with bromocresol purple in radiation dosimetry.

    Science.gov (United States)

    Kattan, Munzer; al Kassiri, Haroun; Daher, Yarob

    2011-02-01

    Polyvinyl chloride (PVC) dyed with bromocresol purple was investigated as a high-dose radiation dosimeter. The absorbance at 417 nm depends linearly on the dose below 50 kGy. The response depends neither on dose rate nor on the irradiation temperature. The effects of post-irradiation storage in the dark and in indirect sunlight are also discussed.

  10. Redetermination of Dy3Ni from single-crystal X-ray data

    Directory of Open Access Journals (Sweden)

    Volodymyr Levytskyy

    2013-11-01

    Full Text Available The classification of the title compound, tridysprosium nickel, into the Fe3C (or Al3Ni structure type has been deduced from powder X-ray diffraction data with lattice parameters reported in a previous study [Lemaire & Paccard (1967. Bull. Soc. Fr. Mineral. Cristallogr. 40, 311–315]. The current re-investigation of Dy3Ni based on single-crystal X-ray data revealed atomic positional parameters and anisotropic displacement parameters with high precision. The asymmetric unit consists of two Dy and one Ni atoms. One Dy atom has site symmetry .m. (Wyckoff position 4c and is surrounded by twelve Dy and three Ni atoms. The other Dy atom (site symmetry 1, 8d has eleven Dy and three Ni atoms as neighbours, forming a distorted Frank–Kasper polyhedron. The coordination polyhedron of the Ni atom (.m., 4c is a tricapped trigonal prism formed by nine Dy atoms.

  11. 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.

  12. Tapahtumamarkkinointi brändin vahvistamisen tukena

    OpenAIRE

    Kähkönen, Nea

    2014-01-01

    Opinnäytetyö on toimeksianto Yritys X:ltä. Tutkimuksen tavoitteena on selvittää, miten hyvin järjestetty tapahtuma tukee brändiä. Lisäksi tutkimuksella pyritään selvittämään, oliko järjestetty tapahtuma onnistunut, ja miten sitä voisi kehittää. Teoreettinen viitekehys on rakennettu pitkälti brändi-identiteetin suunnittelun mallin mukaiseksi. Teoriassa käsitellään brändin rakentamista lähtien analyyseistä, brändi-identiteetin muodostamiseen, brändin tunnettuuden luomiseen, positiointiin ja...

  13. Study of the structure of the transition nuclei 152Dy, 154Dy and 156Er at high angular momentum

    International Nuclear Information System (INIS)

    Measurements of feeding times of high spin yrast states in 152Dy, 154Dy and 156Er were utilized to obtain information about possible spin dependent shape changes. Feeding times as well as lifetimes were determined with the recoil distance technique. In 152Dy only long feeding times (> 10 ps) could be identified, indicating that the aligned-particle yrast states are fed through configuration of similar character, with little direct population from collective cascade in the continuum region. In 154Dy discrete states with I ≤ 30 have lifetimes which are characteristically collective, whereas the preyrast cascade exhibit both fast ( 10 ps) feeding components. The latter imply a change with increasing spin from collective to aligned-particle character, signalling a prolate to oblate shape transition. In 156Er the yrast states up to spin 20 ℎ were found to be collective. These levels are fed, however, from long-lived high spin states, causing time delay up to ∼ 100 ps, the existence of which is interpreted as a signature for an oblate shape at high spin

  14. 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.

  15. Lastnosti lesa bršljana

    OpenAIRE

    Merhar, Klemen

    2014-01-01

    Raziskali smo tiste izbrane lastnosti lesa navadnega bršljana (Hedera helix L.), ki bi utegnile predvideti njegovo uporabo. Raziskali smo anatomsko zgradbo in makroskopske posebnosti, vlažnost v svežem stanju, gostoto, anizotropijo krčenja in nabrekanja, kazalnike dimenzijske stabilnosti ter tlačno in upogibno trdnost bršljanovega lesa. Raziskava je pokazala, da bršljanov les spada med polvenčasto porozne drevesne vrste. Gostota absolutno suhega lesa je 522 kg/m3. Vlažnost svežega lesa, ki jo...

  16. 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. PMID:25637654

  17. 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.

  18. HgTe-CdTe SUPERLATTICES

    OpenAIRE

    Smith, D.; Mcgill, T.

    1984-01-01

    We report on a theoretical study of the electronic properties of HgTe-CdTe superlattices. The band gap as a function of layer thickness, effective masses normal to the layer plane and tunneling length are compared to the corresponding (Hg, Cd)Te alloys. We find that the superlattice possesses a number of properties that may make it superior to the corresponding alloy as an infrared material.

  19. Study on Micro Electrolysis Treatment for Decolorizing Dyed Water

    Institute of Scientific and Technical Information of China (English)

    王敏欣; 朱书全; 何绪文

    2001-01-01

    Method for decolrizing dyed wastewater was researched and the affecting factors dicussed. The result shows that the conditions for getting an optimum decolorization effect are: a reaction time of 60 min, a coke size of 5~10 mm, a solid/liquid ratio of 1∶10, an air blast volume of 4 m3/h, and proper Fe/coke ratio determined by the type of dye material. The system acidity influences dyed wastewater in different ways, i.e., acid condition is good for the decolorization of scarlet 3R and methyl orange simulated wastewater but bad for that of alkali violet 5BN simulated wastewater, while the decolorization of dispersed yellow E-RGFL simulated wastewater has nothing to do with pH.

  20. A PERIOD INVESTIGATION OF THE SX PHOENICIS STAR DY PEGASI

    International Nuclear Information System (INIS)

    We measure two new times of light maximum of the SX Phoenicis star DY Pegasi in 2008 December and collect 410 pe/CCD times of light maximum that had been published. These data could be modeled with a nonlinear fit including a continuously decreasing period change (dP/dt = -9.04 x 10-12 days day-1) and a periodic change with a period of 42.2 yr. If this periodic change is caused by the light traveling time effect of an orbital motion of DY Pegasi in a binary system, the deduced mass of the companion could be 0.028 Msun and it is probably a brown dwarf.

  1. EST Table: DY230642 [KAIKOcDNA[Archive

    Lifescience Database Archive (English)

    Full Text Available DY230642 EST01377 10/09/28 42 %/114 aa ref|YP_015696.1| polyprotein [Kakugo virus] ...dbj|BAD06930.1| polyprotein [Kakugo virus] 10/09/03 n.h 10/08/28 n.h 10/09/10 n.h 10/09/10 n.h 10/09/10 n.h DN237490 BmP ...

  2. Brändimielikuvia kosmetiikan markkinoilla : Cliniquen brändimielikuva

    OpenAIRE

    Pitkä, Nea

    2014-01-01

    Tämän opinnäytetyön tarkoituksena oli selvittää, millainen Cliniquen brändimielikuva on kuluttajien kokemana. Clinique on suurimpia kosmetiikkabrändejä selektiivisen kosmetiikan markkinoilla. Yhdysvaltalaisella Cliniquella on omalaatuinen kliininen imago kilpailijoihinsa nähden, joten brändistä muotoutunutta mielikuvaa tutkittiin sen pohjalta. Toinen selvityksen kohde oli Cliniquen brändimielikuvan vaikutus ostopäätökseen. Työssä käsiteltiin laajasti brändin määritelmää ja olennaisimpia t...

  3. Measurement of the Ratio of Branching Fractions Br(Bs -> Ds- pi+)/Br(B -> D- pi+) at CDF-II

    Energy Technology Data Exchange (ETDEWEB)

    Furic, Ivan Kresimir; /MIT

    2004-03-01

    The measurement of B{sub s}{sup 0} mixing is one of the flagship analyses for the Run II B physics program. The sensitivity of the measurement to the frequency of B{sub s}{sup 0} oscillations strongly depends on the number of reconstructed B{sub s}{sup 0} mesons. They present the measurement of the ratio of branching fractions Br(B{sub s}{sup 0} {yields} D{sub s}{sup -}{pi}{sup +})/Br(B{sup 0} {yields} D{sup -}{pi}{sup +}), which directly influences the number of B{sub s}{sup 0} events available for the measurement of B{sub s}{sup 0} mixing at CDF-II. They analyze 115 pb{sup -1} of data collected with the CDF-II detector in p{bar p} collisions at {radical}s = 1.96 TeV using a novel displaced track trigger. They reconstruct 78 {+-} 11 B{sub s}{sup 0} {yields} D{sub s}{sup -}{pi}{sup +} decays at 1153 {+-} 45 B{sup 0} {yields} D{sup -}{pi}{sup +} decays with good signal to background ratio. This is the world's largest sample of fully reconstructed B{sub s}{sup 0} {yields} D{sub s}{sup -}{pi}{sup +} decays. They find the ratio of production fractions multiplied by the ratio of branching fractions to be: f{sub s}/f{sub d} {center_dot} Br(B{sub s}{sup 0} {yields} D{sub s}{sup -}{pi}{sup +})/Br(B{sup 0} {yields} D{sup -}{pi}{sup +}) = 0.325 {+-} 0.046(stat) {+-} 0.034(syst) {+-} 0.084 (BR). Using the world average value of f{sub s}/f{sub d} = 0.26 {+-} 0.03, we infer that the ratio of branching fractions is: Br(B{sub s}{sup 0} {yields} D{sub s}{sup -}{pi}{sup +})/Br(B{sup 0} {yields} D{sup -}{pi}{sup +}) = 1.25 {+-} 0.18(stat) {+-} 0.13(syst) {+-} 0.32(BR) {+-} 0.14(PR) where the last uncertainty is due to the uncertainty on the world average measurement of the ratio of B{sub s}{sup 0} to B{sup 0} production rates, f{sub s}/f{sub d}.

  4. Analysis of Etched CdZnTe Substrates

    Science.gov (United States)

    Benson, J. D.; Bubulac, L. O.; Jaime-Vasquez, M.; Lennon, C. M.; Arias, J. M.; Smith, P. J.; Jacobs, R. N.; Markunas, J. K.; Almeida, L. A.; Stoltz, A.; Wijewarnasuriya, P. S.; Peterson, J.; Reddy, M.; Jones, K.; Johnson, S. M.; Lofgreen, D. D.

    2016-06-01

    State-of-the-art as-received (112)B CdZnTe substrates have been examined for surface impurity contamination and polishing residue. Two 4 cm × 4 cm and one 6 cm × 6 cm (112)B state-of-the-art as-received CdZnTe wafers were analyzed. A maximum surface impurity concentration of Al = 1.7 × 1015 atoms cm-2, Si = 3.7 × 1013 atoms cm-2, Cl = 3.12 × 1015 atoms cm-2, S = 1.7 × 1014 atoms cm-2, P = 1.1 × 1014 atoms cm-2, Fe = 1.0 × 1013 atoms cm-2, Br = 1.2 × 1014 atoms cm-2, and Cu = 4 × 1012 atoms cm-2 was observed on the as-received CdZnTe wafers. CdZnTe particulates and residual SiO2 polishing grit were observed on the surface of the as-received (112)B CdZnTe substrates. The polishing grit/CdZnTe particulate density on CdZnTe wafers was observed to vary across a 6 cm × 6 cm wafer from ˜4 × 107 cm-2 to 2.5 × 108 cm-2. The surface impurity and damage layer of the (112)B CdZnTe wafers dictate that a molecular beam epitaxy (MBE) preparation etch is required. The contamination for one 4 cm × 4 cm and one 6 cm × 6 cm CdZnTe wafer after a standard MBE Br:methanol preparation etch procedure was also analyzed. A maximum surface impurity concentration of Al = 2.4 × 1015 atoms cm-2, Si = 4.0 × 1013 atoms cm-2, Cl = 7.5 × 1013 atoms cm-2, S = 4.4 × 1013 atoms cm-2, P = 9.8 × 1013 atoms cm-2, Fe = 1.0 × 1013 atoms cm-2, Br = 2.9 × 1014 atoms cm-2, and Cu = 5.2 × 1012 atoms cm-2 was observed on the MBE preparation-etched CdZnTe wafers. The MBE preparation-etched surface contamination consists of Cd(Zn)Te particles/flakes. No residual SiO2 polishing grit was observed on the (112)B surface.

  5. Basidiomycete DyPs: Genomic diversity, structural–functional aspects, reaction mechanism and environmental significance

    OpenAIRE

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

    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). Since the first description, fewer than ten basidiomycete DyPs have been purified and characterized, but a large number of sequences are available from genomes...

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

    OpenAIRE

    Uzma Syed; Rafique Ahmed Jhatial

    2013-01-01

    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...

  7. Stability and collapse of fermions in a binary dipolar boson-fermion 164Dy-161Dy mixture

    Science.gov (United States)

    Adhikari, S. K.

    2013-10-01

    We suggest a time-dependent mean-field hydrodynamic model for a binary dipolar boson-fermion mixture to study the stability and collapse of fermions in the 164Dy-161Dy mixture. The condition of stability of the dipolar mixture is illustrated in terms of phase diagrams. A collapse is induced in a disk-shaped stable binary mixture by jumping the interspecies contact interaction from repulsive to attractive by the Feshbach resonance technique. The subsequent dynamics is studied by solving the time-dependent mean-field model including three-body loss due to molecule formation in boson-fermion and boson-boson channels. Collapse and fragmentation in the fermions after subsequent explosions are illustrated. The anisotropic dipolar interaction leads to anisotropic fermionic density distribution during collapse. This study is carried out in three-dimensional space using realistic values of dipolar and contact interactions.

  8. Effect of LiF on Densification and Mechanical Properties of Dy-α-Sialon Ceramics

    Institute of Scientific and Technical Information of China (English)

    2006-01-01

    The effect of LiF on the densification and mechanical properties of hot-pressed Dy-α-sialon ceramics was studied. Comparatively, without LiF as sintering additive, the pure Dy-α-sialon ceramic should be sintered at 1750 ℃. When LiF is used, the sintering temperature of the Dy-α-sialon is greatly lowered to 1500~1650 ℃. Obviously, the addition of LiF has a strong effect on the improvement in densification. Meanwhile, the resultant Dy-α-sialon has no significant changes in the mechanical properties.

  9. DyVO4 thermal expansion anomalies caused by quadrupole ordering

    International Nuclear Information System (INIS)

    The experimental and theoretical studies on anomalies of the DyVO4 crystals thermal expansion, conditioned by ordering the Q2 quadrupole moments of the Dy3+ ion, are presented. The calculated curves sufficiently well describe the experiment both in the tetragonal and rhombic phases. The values of the complete quadrupole constant and magnetoelastic contribution to it are obtained for the DyVO4. It is noted, that the DyVO4 is the only crystal in the zircons family, for which the γ-symmetry quadrupole ordering is realized

  10. Synthesis and Characterization of a Novel Compound SnDy2O4

    Institute of Scientific and Technical Information of China (English)

    2002-01-01

    A new phase, the rare earth complex oxide SnDy2O4 was synthesized by the thermal decomposition of its oxalate precursor that was prepared by rheological phase reaction method. TG, IR, XRD and EPS were used to prove the formation of the compound SnDy2O4. The structure of SnDy2O4 was refined by Rietveld analysis. SnDy2O4 is cubic, a = 7.40366A, V = 405.82A3, Z = 4.

  11. Tuning of Hula-Hoop Coordination Geometry in a Dy Dimer

    OpenAIRE

    Yan Peng; Valeriu Mereacre; Anson, Christopher E; Powell, Annie K.

    2016-01-01

    The reaction of DyCl3 with hydrazone Schiff base ligands and sodium acetate in the presence of triethylamine (Et3N) as base affords two dysprosium dimers: [Dy2(HL1)2(OAc)2(EtOH)(MeOH)] (1) and [Dy2(L2)2(OAc)2(H2O)2]·2MeOH (2). The DyIII ions in complexes 1 and 2 are linked by alkoxo bridges, and display “hula hoop” coordination geometries. Consequently, these two compounds show distinct magnetic properties. Complex 1 behaves as a field-induced single molecule magnet (SMM), while typical SMM b...

  12. 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

  13. Occurrence of magnetoelectric effect correlated to the Dy order in Dy2NiMnO6 double perovskite

    Science.gov (United States)

    Masud, Md G.; Dey, K.; Ghosh, A.; Majumdar, S.; Giri, S.

    2015-08-01

    Magnetic, dielectric, and ac conductivity as well as room temperature structural and Raman studies are performed on double perovskite Dy2NiMnO6. The crystal structure of the compound adopts monoclinic P21/n space group, where alternate Mn and Ni distorted octahedral are arranged in anti-phase a- a- b+ order in Glazer notation. Magnetization studies show two magnetic transitions around 100 K and 20 K which are related to the ordering of transition and rare earth cations moment, respectively. Temperature dependent dielectric permittivity shows Havriliak-Negami type thermally activated dielectric relaxation. The ac conductivity at different temperature is found to follow Jonscher power law behavior. Time-temperature scaling of the conductivity spectra reveals that the charge transport dynamics is independent of temperature. Intriguingly, an anomaly in the dielectric constant is observed close to the order of Dy moment which indicates intrinsic magnetoelectric coupling. The hybridization between Dy and Ni/Mn is suggested to be correlated with the magnetoelectric coupling.

  14. Studies of sintered MRE-Fe-B magnets by DyF3 addition or diffusion treatment (MRE = Nd + Y + Dy)

    Science.gov (United States)

    Tang, W.; Dennis, K. W.; Kramer, M. J.; Anderson, I. E.; McCallum, R. W.

    2012-04-01

    Sintered MRE2(Fe, Co)14B magnets by DyF3 blending or diffusion treatment were investigated. "Base-line" magnets with a thickness of 1.5 mm were coated (painted) with DyF3 powder and heated to promote Dy diffusion at 800-900 °C, i.e., "Diffusion" magnets. For comparison, the magnet alloy powder for making Base-line magnets was blended with 3-5 wt.% DyF3 powder and then made into sintered magnets, i.e., "Blended" magnets. The coercivity and (BH)max of Base-line magnets were 9.7 kOe and 32.7 MGOe, respectively, while the coercivity of Diffusion magnets was increased to 15 kOe and the (BH)max was nearly unchanged at 31.4 MGOe. Blended magnets with 5 wt% DyF3 had a coercivity of 17.8 kOe, but the (BH)max was reduced to 25.4 MGOe, due to a considerable reduction of remanence. The total Dy concentration in the MRE2(Fe, Co)14B Diffusion magnets with a β value of -0.5%/°C was 5.3 wt%, while typical commercial Nd-based Nd2Fe14B magnets require at least 7.5 wt% Dy to achieve the same β. Therefore, the MRE2(Fe, Co)14B Diffusion magnets exhibited better temperature stability.

  15. 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. PMID:26205819

  16. Magnetic properties of Dy{sup 3+} ions and crystal field characterization in YF{sub 3}:Dy{sup 3+} and DyF{sub 3} single crystals

    Energy Technology Data Exchange (ETDEWEB)

    Savinkov, A V; Korableva, S L; Rodionov, A A; Kurkin, I N; Malkin, B Z; Tagirov, M S [Kazan State University, 420008 Kazan (Russian Federation); Suzuki, H; Matsumoto, K; Abe, S [Kanazawa University, Kakuma-machi, 920-1192 Kanazawa (Japan)], E-mail: boris.malkin@ksu.ru

    2008-12-03

    The dc magnetic susceptibilities of the orthorhombic DyF{sub 3} single crystals have been measured in the temperature range between 1.8 and 300 K. The susceptibility along the b-axis does not depend on temperature below T{sub C} = 2.55 K and is equal to the demagnetizing factor of the sample, that gives evidence for the ferromagnetic phase induced by the magnetic dipole-dipole interactions between the Dy{sup 3+} ions. The saturation moment of 8.5 {mu}{sub B}/Dy{sup 3+} along the b-axis was determined from magnetization measurements. The observed strong anisotropy of the magnetic susceptibility at low temperatures agrees with the measured anisotropic g-tensor of the ground state of impurity Dy{sup 3+} ions in YF{sub 3} single crystals. The results of measurements are interpreted in the frameworks of the crystal field theory and the mean magnetic field approximation.

  17. 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.

  18. Optical properties of CdBr2:Eu and CdBr2:Eu, Mn crystals

    International Nuclear Information System (INIS)

    Optical and luminescent properties of the CdBr:Eu and CdBr2:Eu, Mn crystals, grown through the Stockbarger-Bridgman method in evacuated quartz ampoules, are studied within the temperature range of 85-295 K. The results obtained are compared with spectral characteristics of the CdBr2 and CdBr2:Mn crystals. The band with the maximum about 254 nm, observed in the absorption spectra of mono- and polyactivated crystals of cadmium bromide, is attributed to the 4f7 -> 4f65d electron transitions in the Eu2+ ions. The manganese sensitized luminescence is identified by excitation of the CdBr2:Eu, Mn crystals by the light from the area of this band. The nature of the capture centers, responsible for thermostimulated fluorescence, and excitation mechanisms of recombination luminescence in the studied crystals are considered

  19. Brändiopas : brändäys kauneudenhoitoalalla

    OpenAIRE

    Rastas, Kaisa

    2015-01-01

    Brändit vetoavat asiakkaan tunteisiin ja tuottavat elämyksiä sekä unohtumattomia kokemuksia. Brändi on aineeton ulottuvuus, mielikuva, joka rakentuu asiakkaan mielessä. Brändi onkin hieman erilainen eri ihmiseltä kysyttäessä. Tässä oppaassa käsiteltiin kauneudenhoitoalan yritys- ja henkilöbrändin rakentamisen vaiheita. Oppaassa käsiteltiin myös asiakaskokemuksen merkitystä menestyvän yritysbrändin rakentumisessa. Vaikka brändi termiä käytetään hyvin laajasti puhekielessä, se usein liitet...

  20. Brändikäsikirja brändinhallinnan tukena Case: Innojok Oy

    OpenAIRE

    Tamminen, Tytti; Uusitalo, Nea

    2016-01-01

    Opinnäytetyön tavoitteena oli laatia brändikäsikirja opinnäytetyön case yritys Innojok Oy:lle. Tutkimustyön tarkoituksena on selvittää, mitä tehokkaan ja hyödyllisen brändikäsikirjan tulisi sisältää, jotta sen optimaalinen käyttötarkoitus toteutuu. Toimeksianto saatiin case yritykseltä, koska yrityksellä ei ollut vielä brändikäsikirjaa olemassa. Opinnäytetyön teoreettinen viitekehys käsittelee brändiä ja brändinhallinnan merkitystä liiketoiminnan kannalta. Opinnäytetyön teoreettisen ...

  1. Photoluminescence of atomic layer deposited ZrO{sub 2}:Dy{sup 3+} thin films

    Energy Technology Data Exchange (ETDEWEB)

    Kiisk, Valter, E-mail: valter.kiisk@ut.ee; Tamm, Aile; Utt, Kathriin; Kozlova, Jekaterina; Mändar, Hugo; Puust, Laurits; Aarik, Jaan; Sildos, Ilmo

    2015-05-29

    Atomic layer deposition based on alternate cycling of ZrCl{sub 4}, Dy(thd){sub 3} and H{sub 2}O as precursors was applied for preparation of nanocrystalline ZrO{sub 2}:Dy thin films. Photoluminescence (PL) properties of Dy{sup 3+} in the ZrO{sub 2} films were studied at several laser excitations. Substantial activation of Dy{sup 3+} PL required thermal treatment at 900 °C. As a result of annealing, thinner (~ 80 nm) films with higher Dy content retained relatively high amount of tetragonal phase and remained crack-free. In thicker (~ 140 nm) films, considerable amount of monoclinic phase was formed and a peculiar microscale cracking pattern was developed along with phase segregation. It is demonstrated that the crystal structure of ZrO{sub 2} significantly influences the Dy{sup 3+} emission spectrum and, at least for ZrO{sub 2}-type matrices, Dy{sup 3+} is an excellent luminescent microprobe in comparison with micro-Raman scattering. A Förster-like PL decay profile allowed a conclusion that the self-quenching due to cross-relaxation between Dy{sup 3+} ions had a marked impact on emission intensity. - Highlights: • Atomic layer deposition of luminescent Dy-doped ZrO{sub 2} thin films was demonstrated. • Dy{sup 3+} luminescence was significantly activated only after high-temperature annealing. • Correlation between luminescent and structural properties was obtained. • Dy{sup 3+} luminescent probe showed superior performance compared to Raman-scattering. • Presence of several quenching processes was deduced from luminescence behavior.

  2. Brändäys pelialalla

    OpenAIRE

    Saarelainen, Joona

    2014-01-01

    Tämän opinnäytetyön tavoitteena oli tarjota lukijalle tietopaketti siitä, mikä merkitys brändeillä ja brändäyksellä on kuluttajille videopelimarkkinoilla. Työn tarkoituksena oli tarjota kansainvälisille pelimarkkinoille pyrkivälle yritykselle tietoa brändin rakentamisen aloittamisesta ja siinä tarvittavista analyyseistä. Tämä oli myös opinnäytetyöhön valittu tutkimusongelma. Opinnäytetyö kirjoitettiin kahdessa eri osassa. Teoriaosuus käsittelee suomalaista ja kansainvälistä pelialaa sekä...

  3. Production of 77 Br for medical application

    International Nuclear Information System (INIS)

    Bromine-77 is produced with the variable energy cyclotron (CV-28) at the Instituto de Engenharia Nuclear, via the 75 As. (α, 2 n) 77 Br reaction, by bombarding arsenic trioxide with 28 MeV alpha-particles. The thick target yield is 0.3 mCi/μAh. The target is dissolved in concentrated N H4 OH and 77 Br, separated from arsenic, by an anionic exchange resin, is obtained carrier-free with a separation yield greater than 90%. All the process is remotely controlled using electric and pneumatic systems, manipulators and tongs. The quality control is made by atomic absorption and gamma-ray spectroscopy. The present production rate of Br-77 is 2.3 mCi per irradiation. (author)

  4. Vertical sections of Tb0.15Ho0.85Fey-Tb0.3Dy0.7Fey (y=1.85, 1.9, 2.0) in Tb-Dy-Ho-Fe system

    Institute of Scientific and Technical Information of China (English)

    王博文; 黄文美; 翁玲; 孙英; 曹淑瑛; 王志华

    2015-01-01

    The x(Tb0.15Ho0.85Fey)+(1–x)(Tb0.3Dy0.7Fey) (x=0, 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9;y=1.85, 1.9, 2.0) samples were prepared by a vacuum arc furnace, and annealed at 1000 ºC for 1 d and at 950 ºC for a week. Three vertical sections of Tb0.15Ho0.85Fey-Tb0.3Dy0.7Fey (y=1.85, 1.9, 2.0) in the Tb-Dy-Ho-Fe system were determined using optical microscopy, scanning elec-tron microscopy, energy dispersion X-ray spectroscopy, X-ray diffraction, and differential thermal analysis. These vertical sections consisted of two single-phase regions: L and (Tb,Dy,Ho)Fe2; four two-phase regions: L+(Tb,Dy,Ho)Fe3, L+(Tb,Dy,Ho)Fe2, (Tb,Dy,Ho)Fe2+(Tb,Dy,Ho)Fe3, and (Tb,Dy,Ho)Fe2+(Tb,Dy,Ho). The high Ho content of (Tb,Dy,Ho)Fey alloys led to the elevation of the peritectic temperature of L+(Tb,Dy,Ho)Fe3→(Tb,Dy,Ho)Fe2. The region of (Tb,Dy,Ho)Fe2 phase was shifted towards the side of rich-Ho with the Fe content increasing. It meant that the substitution of Ho for Dy or Tb had a marked effect on the solidification process of (Tb,Dy,Ho)Fe2 compounds.

  5. DyCl3-NaCl体系相图的热力学优化计算%Thermodynamic Optimization of DyCl3 -NaCl System

    Institute of Scientific and Technical Information of China (English)

    叶信宇; 孙益民; 张静; 谈君君

    2005-01-01

    In this paper, the phase diagram of the DyCl3-NaC1 system is optimized and calculated with CALPHAD (calculation of phase diagram) technology. A set of thermodynamic functions of compounds Na3 DyCl6, NaDyCl4, and NaDy2 Cl7 have been optimized and calculated based on an interactive computer-assisted analysis. The optimized thermodynamic parameters, calculated phase diagram and experimental phase diagram are thermodynamically self-consistent.

  6. Preparation, characterization, and photocatalytic activity of porous AgBr@Ag and AgBrI@Ag plasmonic photocatalysts

    Science.gov (United States)

    Yang, Fan; Tian, Baozhu; Zhang, Jinlong; Xiong, Tianqing; Wang, Tingting

    2014-02-01

    Porous AgBr@Ag and AgBrI@Ag plasmonic photocatalysts were synthesized by a multistep route, including a dealloying method to prepare porous Ag, a transformation from Ag to AgBr and AgBrI, and a photo-reduction process to form Ag nanoparticles on the surface of AgBr and AgBrI. It was found that the porous structure kept unchanged during Ag was transferred into AgBr, AgBrI, AgBr@Ag, and AgBrI@Ag. Both porous AgBr@Ag and porous AgBrI@Ag showed much higher visible-light photocatalytic activity than cubic AgBr@Ag for the degradation of methyl orange, which is because the interconnected pore channels not only provide more reactive sites but also favor the transportation of photo-generated electrons and holes. For AgBrI@Ag, AgBrI solid solution formed at the interface of AgBr and AgI, and the phase junction can effectively separate the photo-generated electrons and holes, favorable to the improvement of photocatalytic activity. The optimal I content for obtaining the highest activity is ∼10 at.%.

  7. 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

    2004-10-01

    This thesis presents evidence for the decay mode B{sup {+-}} {yields} {phi}K{sup {+-}} in p{bar p} collisions at {radical}s = 1.96 TeV using (120 {+-} 7)pb{sup -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{sup {+-}} {yields} J/{psi}K{sup {+-}}. The measurement starts from reconstructing the two decay modes: B{sup {+-}} {yields} {phi}K{sup {+-}}, where {phi} {yields} K{sup +}K{sup -} and B{sup {+-}} {yields} J/{psi}K{sup {+-}}, where J/{psi} {yields} {mu}{sup +}{mu}{sup -}. The measurement yielded 23 {+-} 7 B{sup {+-}} {yields} {phi}K{sup {+-}} events, and 406 {+-} 26 B{sup {+-}} {yields} J/{psi}K{sup {+-}} events. The fraction of B{sup {+-}} {yields} J/{psi}K{sup {+-}} events where the J/{psi} subsequently decayed to two muons (as opposed to two electrons) was found to be f{sub {mu}{mu}} = 0.839 {+-} 0.066. The relative branching ratio of the two decays is then calculated based on the equation: BR(B{sup {+-}} {yields} {phi}K{sup {+-}})/BR(B{sup {+-}} {yields} J/{psi}K{sup {+-}}) = N{sub {phi}K}/N{sub {psi}K} {center_dot}f{sub {mu}{mu}} BR(J/{psi} {yields} {mu}{sup +}{mu}{sup -})/BR({phi} {yields} K{sup +}K{sup -}) {epsilon}{sub {mu}{mu}}K/{epsilon}KKK R({epsilon}{sub iso}). The measurement finds BR(B{sup {+-}} {yields} {phi}K{sup {+-}})/BR(B{sup {+-}} {yields} J/{psi}K{sup {+-}}) = 0.0068 {+-} 0.0021(stat.) {+-} 0.0007(syst.). The B{sup {+-}} {yields} {phi}K{sup {+-}} branching ratio is then found to be BR(B{sup {+-}} {yields} {phi}K{sup {+-}}) = [6.9 {+-} 2.1(stat.) {+-} 0.8(syst.)] x 10{sup -6}. This value is consistent with similar measurements reported by the e{sup +}e{sup -} collider experiments BaBar[1], Belle[2], and CLEO[3].

  8. Performance of Brazilian thermoluminescent CaSO{sub 4}: Dy pellets in standard diagnostic radiology beams

    Energy Technology Data Exchange (ETDEWEB)

    Maia, A.F.; Caldas, L.V.E. [Instituto de Pesquisas Energeticas e Nucleares, Comissao Nacional de Energia Nuclear, Av. Prof. LIneu Prestes, 2242 Sao Paulo (Brazil)]. e-mail: afmaia@ipen.br

    2006-07-01

    The high sensitivity of CaSO{sub 4}: Dy as a thermoluminescent material is a great advantage when dealing with low dose levels, as in diagnostic radiology procedures. However, these kinds of dosemeters present a high energy dependence that must be precisely determined in the energy range of interest. Dosimetric pellets of CaSO{sub 4}: Dy are produced at IPEN since the end of the 80 Th decade. These pellets are produced in three forms: conventional CaSO{sub 4}: Dy (50 mg); thin CaSO{sub 4}: Dy (20 mg) and CaSO{sub 4}: Dy + 10% C (20 mg). The main applications of these dosemeters are in personal and environmental dosimetry. In this study, CaSO{sub 4}: Dy pellets produced at IPEN were evaluated in diagnostic radiology standard beams. These qualities are based on the IEC 61267 standard, and they were established at an industrial X-ray system Pantak/Seifert, model ISOVOLT 160HS. Former studies evaluated CaSO{sub 4}: Dy of different origins in diagnostic beams. In this study, a large energy interval was used to include computed tomography energy beams. The results obtained show the behavior of the IPEN CaSO{sub 4}: Dy pellets in diagnostic standard beams. All results confirm that these pellets may be used for dosimetric procedures in diagnostic radiology beams. (Author)

  9. 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.

  10. Competition between rotational and aligned-particle high-spin excitations in 153,154Dy

    International Nuclear Information System (INIS)

    High-spin level structure of the transitional N=87,88 153,154Dy nuclei have been studied using 124Sn(34S,xn) reactions. In both nuclei the lower part of the level scheme includes decoupled rotational bands indicating prolate deformation in yrast structures between I=17/2 and 41/2 in 153Dy and up to I=30 in 154Dy. Above these collective bands the level structure becomes irregular, very similar to the aligned multiparticle structure in 152Dy. The yrast 2.3 ns 47/2 isomer at 5591 keV shows that aligned-particle excitations compete succesfully with collective rotation above 5 MeV in 153Dy. The similar change occurs in 154Dy above 10 MeV after the S-band has crossed with the S'-band. The aligned configurations are connected with the ablate shape of the nucleus and our results show that a transition from a basically prolate to ablate shape occurs in 153Dy above I=41/2 and in 154Dy above I=32. (author)

  11. Particle-vibration coupled states in 161Dy

    International Nuclear Information System (INIS)

    States in 161Dy have been populated using the inelastic (τ,τ') reaction. Strong particle groups in the 0.9 MeV excitation region are interpreted to arise from a coupling of an odd particle in the [642]5/2+ Nilsson orbital to a γ-vibration of the even core. The 1/2+ and 3/2+ members of the antialigned particle-vibration sequence are found to interact with states from the N=4 and N=6 oscillator shell, thus modifying previous conclusions on the ΔN=2 coupling. The particle-vibration states are discussed within a particle-core model

  12. Giant magnetocaloric effect in antiferromagnetic DyVO4 compound

    Science.gov (United States)

    Midya, A.; Khan, N.; Bhoi, D.; Mandal, P.

    2014-09-01

    We have investigated the magnetic and magnetocaloric properties of DyVO4 by magnetization and heat capacity measurements. χ(T) shows antiferromagnetic to paramagnetic transition at TNDy~3.5 K. The compound undergoes a metamagnetic transition and exhibits a huge entropy change. The maximum values of magnetic entropy change (ΔSM), adiabatic temperature change (ΔTad) and refrigerant capacity (RC) reach 26 J kg-1 K-1, 17 K, and 526 J kg-1, respectively for a field change of 0-8 T. Moreover, the material is highly insulating and exhibits no thermal and field hysteresis, satisfying the necessary conditions for a good magnetic refrigerant material.

  13. Dynamic parameters of Tb-Dy-Fe giant magnetostrictive alloy

    Institute of Scientific and Technical Information of China (English)

    白夏冰; 蒋成保

    2010-01-01

    Tb0.3Dy0.7Fe1.90 oriented rods were prepared by zone melting with unidirectional solidification.The magnetomechanical coupling factor(k33) was measured by magnetomechanical resonance under different DC bias fields up to 77.4 mT.An effective method was provided to calculate sonic velocity,elastic modulus and compliance constant through measuring resonate frequency(fr),and calculate dynamic magnetostriction(d33) via measuring magnetic permeability,magnetomechanical coupling factor(k33) and compliance co...

  14. Parametric models of reflectance spectra for dyed fabrics

    Science.gov (United States)

    Aiken, Daniel C.; Ramsey, Scott; Mayo, Troy; Lambrakos, Samuel G.; Peak, Joseph

    2016-05-01

    This study examines parametric modeling of NIR reflectivity spectra for dyed fabrics, which provides for both their inverse and direct modeling. The dye considered for prototype analysis is triarylamine dye. The fabrics considered are camouflage textiles characterized by color variations. The results of this study provide validation of the constructed parametric models, within reasonable error tolerances for practical applications, including NIR spectral characteristics in camouflage textiles, for purposes of simulating NIR spectra corresponding to various dye concentrations in host fabrics, and potentially to mixtures of dyes.

  15. 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.

  16. Quadrupole moments in chiral material DyFe3(BO3)4 observed by resonant x-ray diffraction

    Science.gov (United States)

    Nakajima, Hiroshi; Usui, Tomoyasu; Joly, Yves; Suzuki, Motohiro; Wakabayashi, Yusuke; Kimura, Tsuyoshi; Tanaka, Yoshikazu

    2016-04-01

    By means of circularly polarized x rays at the Dy L3 and Fe K absorption edges, the chiral structure of the electric quadrupole was investigated for a single crystal of DyFe3(BO3)4, in which both Dy and Fe ions exhibit a spiral arrangement. The integrated intensity of the resonant x-ray diffraction of space-group forbidden reflections 004 and 005 is interpreted within the electric dipole transitions from Dy 2 p3/2 to 5 d and Fe 1 s to 4 p , respectively. We have confirmed that the handedness of the crystal observed at Dy L3 and Fe K edges is consistent with that observed at Dy M5 edge reported in a previous study. The electric quadrupole moments of Dy 5 d and Fe 4 p are derived by analyzing the azimuth scans of the diffracted intensity. The temperature profiles of the integrated intensity of 004 at the Dy L3 and the Fe K edges are similar to those of Dy-O and Fe-O bond lengths, while the temperature dependence at the Dy M5 edge does not match the bond-length behavior. The results indicate that the helix chiral orientations of quadrupole moments due to Dy 5 d and Fe 4 p electrons are more strongly coupled to the ligands states than Dy 4 f electrons.

  17. Thermodynamic and Kinetic Study of Crystallization Reaction of Fe/Dy Multilayers Form Amorphous State

    Institute of Scientific and Technical Information of China (English)

    2000-01-01

    To give further insight into the behavior of Fe/Dy multilayers in the crystallization from as-deposited amorphous state, free energy diagram of Fe/Dy system was constructed based on Miedema semiempirical theory. It is shown that the crystallization of amorphous films is controlled by both thermodynamic and kinetic conditions. The calculated free energies of crystalline Fe and Dy are significantly lower than those in the amorphous states, which provide thermodynamic driving force for crystallization. During annealing, the kinetic phase evolution of the multilayers is controlled by free energy barrier of nucleation and critical-size of new phase nucleus. Thus it explains the experimental results that Fe crystallites formed first followed by Dy grains, whereas crystalline Fe-Dy intermetallic compounds were not observed during annealing at moderate temperatures.

  18. Preparation of Dy-Bi alloy films by electrodeposition in organic bath

    Institute of Scientific and Technical Information of China (English)

    LI Gaoren; TONG Yexiang; LIU Guankun

    2004-01-01

    The cyclic voltammetry and potentiostatic electrolysis were used to investigate the preparing of Dy-Bi alloy films in LiCl-DMSO (dimethylsulfoxide) system. The effects of several factors including the potential of deposition, concentrations of main salts, and the concentration ratio of DyCl3 to Bi(NO3)3 were studied. Dy-Bi alloy films containing 4.82%-80.62% (mass fraction) dysprosium were prepared in DyCl3-Bi(NO3)3-LiCl-DMSO system by controlling the system composition and deposition conditions. The films are gray, uniform, metallic luster and adhere firmly to the copper substrates analyzed by SEM (scanning electron microscope), EDS (X-ray energy dispersive analysis), and XRD (X-ray diffraction). After heat treatment at 718 K for l h, the alloy phase of Dy-Bi was found in XRD patterns.

  19. Preparation of DyFe2 and TbFe2 by Reduction-Diffusion Process

    Institute of Scientific and Technical Information of China (English)

    Guangsi GUO; Guangtai WANG; Zhitong SUI

    2004-01-01

    The pure intermetallic compounds (Tb1-xDyx)Fe2 are super-magnetostriction materials, which were produced from DyFe2and TbFe2 in this paper. The thermodynamic possibility and kinetic feasible conditions for DyFe2 and TbFe2 preparation by reduction-diffusion in Ca-Dy2O3-Fe and Ca-Tb4O7-Fe systems were analyzed and the products of DyFe2 and TbFe2 were confirmed by XRD. The contracting core model was applied to describe the reduction-diffusion process in which the diffusion is a rate-controlled step. The apparent activation energies of DyFe2 and TbFe2 processes are 45 and 39 k J/mol respectively.

  20. Tuning of Hula-Hoop Coordination Geometry in a Dy Dimer

    Directory of Open Access Journals (Sweden)

    Yan Peng

    2016-01-01

    Full Text Available The reaction of DyCl3 with hydrazone Schiff base ligands and sodium acetate in the presence of triethylamine (Et3N as base affords two dysprosium dimers: [Dy2(HL12(OAc2(EtOH(MeOH] (1 and [Dy2(L22(OAc2(H2O2]·2MeOH (2. The DyIII ions in complexes 1 and 2 are linked by alkoxo bridges, and display “hula hoop” coordination geometries. Consequently, these two compounds show distinct magnetic properties. Complex 1 behaves as a field-induced single molecule magnet (SMM, while typical SMM behavior was observed for complex 2. In addition, comparison of the structural parameters among similar Dy2 SMMs with hula hoop-like geometry reveals the significant role played by coordination geometry and magnetic interaction in modulating the relaxation dynamics of SMMs.

  1. Roles of Eu2+, Dy3+ Ions in Persistent Luminescence of Strontium Aluminates Phosphors

    Institute of Scientific and Technical Information of China (English)

    L(U) Xingdong; ZHONG Minjuan; WANG Renqin

    2008-01-01

    The polycrystalline Eu2+ and Dy3+ co-doped strontium aluminates SrAl2O4: Eu2+,Dy3+ with different compositions were prepared by solid state reactions. The UV-excited photoluminescence, persistent luminescence and thermo-luminescence were studied and compared. Results show that the doped Eu2+ ion in SrAl2O4: Eu2+, Dy3+phosphors works as not only the UV-excited luminescent center but also the persistent luminescent center. The doped Dy3+ ion can hardly yield any luminescence under UV-excitation, but effectively enhance the persistent luminescence and thermo-luminescence of SrAl2O4: Eu2+. Dy3+ co-doping can help form electron traps with appropriate depth due to its suitable electro-negativity, and increase the density and depth of electron traps. Based on above observations, a persistent luminescence mechanism, electron transfer model, is proposed and illustrated.

  2. 关于Diophantine方程x3-53=Dy2%On the Diophantine Equation x3-53=Dy2

    Institute of Scientific and Technical Information of China (English)

    普粉丽; 马艳园

    2014-01-01

    Let D be an odd prime. Based on congruent formula and quadratic residue, what is obtained is one sufficient condition for the Diophantine equation x3 -53 =Dy2 without integer solutions.%设D为奇素数,运用同余式、平方剩余等初等方法得出了Diophantine方程x3-53=Dy2无正整数解的一个充分条件。

  3. A Possible Reaction Channel from BrONO to BrNO2

    Institute of Scientific and Technical Information of China (English)

    2002-01-01

    A possible isomerization channel from BrONO (bromine nitrite) to BrNO2 (nitryl bromide) is predicted by means of MP2 and QCISD(T) (single-point) methods. The channel is a direct bromine abstraction reaction from BrONO molecule by NO2 in which the forward reaction barrier is 89.30 kJ/mol at final UQCISD(T)/6-311+G(2df)//UMP2/6-311G(d) level of theory with zero-point energies included. The result can explain the available experiments very well.

  4. Crystal structure, energy band and optical properties of dysprosium monophosphate DyPO{sub 4}

    Energy Technology Data Exchange (ETDEWEB)

    Khadraoui, Z.; Bouzidi, C., E-mail: bouzidtc@yahoo.fr; Horchani-Naifer, K.; Ferid, M.

    2014-12-25

    Graphical abstract: The monophosphate DyPO{sub 4} has been synthesized by high temperature solid-state reaction method and was structurally characterized by single crystal X-ray diffraction. DyPO{sub 4} crystallizes in the tetragonal system (I4{sub 1}/Iamd). The energy-band structure, density of states and the chemical bonds have been investigated by density functional methods (DFT). - Highlights: • The DyPO{sub 4} has been synthesized by high temperature solid-state reaction method. • DFT was used to determine the electronic structure and optical properties of DyPO{sub 4}. • The monophosphate DyPO{sub 4} is an insulator with direct band gap (6.38 eV). - Abstract: A rare earth monophosphate crystal of DyPO{sub 4} has been synthesized by high temperature solid-state reaction method and was structurally characterized by single crystal X-ray diffraction. Atomic arrangement of DyPO{sub 4} structure is based on corner and edge sharing PO{sub 4} tetrahedra and DyO{sub 8} polyhedra. The FTIR, Raman, Scanning electron microscopy, diffuse reflectance and emission spectra of the compound have been investigated. Density functional calculation using a Generalized Gradient Approximation was used to determine the electronic structure and optical properties. The calculated total and partial densities of states indicate that the top of valance band is mainly built upon O-2p states with P-3p states via σ (P–O) interactions, and the low conduction bands mostly originates from Dy-5d. The results show that the monophosphate DyPO{sub 4} is an insulator with a calculated band gap (5.8 eV) closer to the experimental value (6.38 eV)

  5. Magnetic dipole excitations of the 163Dy nucleus

    Science.gov (United States)

    Zenginerler, Zemine; Tabar, Emre; Yakut, Hakan; Kuliev, Ali Akbar; Guliyev, Ekber

    2014-03-01

    In this study some properties of the magnetic dipole excitations of the deformed odd mass 163Dy nucleus were studied by using Quasiparticle-phonon nuclear model (QPNM). The several of the ground-state and low-lying magnetic dipole (M1) mode characteristics were calculated for deformed odd-mass nuclei using a separable Hamiltonian within the QPNM. The M1 excited states, reduced transition probabilities B(M1), the ground-state magnetic properties such as magnetic moment (μ), intrinsic magnetic moment (gK) , effective spin factor (gseff.) are the fundamental characteristics of the odd-mass nucleus and provide key information to understand nuclear structure. The theoretical results were compared with the available experimental data and other theoretical approaches. Calculations show that the spin-spin interaction in this isotopes leads to polarization effect influencing the magnetic moments. Furthermore we found a strong fragmentation of the M1 strength in 163Dy nucleus which was in qualitative agreement with the experimental data. Sakarya University, Project Number: 2012-50-02-007 and Z.Zenginerler acknowledge to TUBITAK-TURKEY 2013, fellowship No: 2219.

  6. Non-collective high-spin states in 148Dy

    International Nuclear Information System (INIS)

    General physical concepts regarding nuclear high-spin states are given. The high-spin states in 148Dy(Z = 66, N = 82) were produced via the reaction 112Cd(Pb-backed)(40Ar,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+(known from previous work), as well as for calculating transition intensities and their associated errors, are given. Calculations of angular correlations for multiple γ-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 γ-ray transitions were discovered above the isomer, thereby extending the 148Dy 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

  7. Shape Coexistence and Band Terminations in N = 89 ^155Dy

    Science.gov (United States)

    Brown, T. B.; Riley, M. A.; Janssens, R. V. F.; Ahmad, I.; Blumenthal, D. J.; Carpenter, M. P.; Fallon, P.; Fischer, S. M.; Hackman, G.; Hartley, D. J.; Kalfas, C.; Khoo, T. L.; Kondev, F. G.; Lauritsen, T.; Nisius, D.; Ma, W. C.; Simpson, J.; Sharpey-Schafer, J. F.; Afanasiev, A.; Ragnarsson, I.

    1998-04-01

    A high spin study of the nucleus ^155_66Dy_89 has been performed using the GAMMASPHERE Spectrometer. The ^124Sn(^36S,5n) reaction was employed at beam energies of 175 and 165 MeV with thick and thin targets respectively. Eight new band sequences have been identified and the previously known sequences have been extended to higher spin. The yrast states of positive and negative parity have been identified up to spin 1/012 with quite different behavior illustrating beautifully the competition between collective prolate and terminating oblate shapes. Detailed comparisions are made with cranked Nilsson Strutinsky calculations. A new feature of the high spin calculations has been added to distinguish between neutrons in h_11/2 orbitals and other N=5 orbitals. This has been found necessary to explain the continuation of near yrast collective structures beyond spin 40 hbar. Additionally, the lowest energy negative parity sequences are observed to return to more collective behavior near spin 45 in a similar manner as N=88 ^154Dy.

  8. Ravintola Tallin brändi-identiteetti ja -imago

    OpenAIRE

    Hirvikoski, Mira

    2015-01-01

    Opinnäytetyöni aiheena on brändi. Brändit ovat nykyaikana oleellinen osa liiketoimintaa ja parhaimmil-laan jopa yritystensä kallisarvoisinta omaisuutta. Brändi-identiteetti on tulevaisuuden tavoite, johon yritys pyrkii. Se kertoo, millaisena yritys toivoisi ulkopuolisten tahojen, kuten asiakkaiden, näkevän sen brändin. Brändi-imago taas kuvaa sitä, millaisena yrityksen ulkopuoliset tahot näkevät sen brändin juuri tällä het-kellä. Opinnäytetyöni tavoitteena oli selvittää, miten Ravintola T...

  9. 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")

  10. 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

  11. Microstructure, and luminescence properties of LiBaPO{sub 4}:Dy{sup 3+} phosphors with various Dy{sup 3+} concentrations prepared by microwave assisted sintering

    Energy Technology Data Exchange (ETDEWEB)

    Yang, Ru-Yuan, E-mail: ryyang@mail.npust.edu.tw; Lai, Hsuan-Lin

    2014-01-15

    LiBaPO{sub 4}:Dy{sup 3+} phosphors were synthesized by microwave-assisted and conventional sintering. XRD analysis confirmed the phase formation of all the LiBaPO{sub 4}:Dy{sup 3+} phosphors. PL results showed that the optimum concentration of Dy{sup 3+} for LiBaPO{sub 4}:Dy{sup 3+} prepared by microwave-assisted sintering is 7 mol%. The phosphors were efficiently excited by the UV–vis light region from 300 to 400 nm, and exhibited blue (483 nm), yellow (576 nm) and red (671 nm) emission corresponding to {sup 4}F{sub 9/2}→{sup 6}H{sub 15/2}, {sup 6}H{sub 13/2}, and {sup 6}H{sub 11/2} transitions, respectively. The microwave-assisted sintering improves the sintering behavior and provides a more uniform particle morphology of LiBa{sub 0.03}PO{sub 4}:0.07Dy{sup 3+} phosphors so as to obtain a luminescence intensity greater than that obtained by conventional sintering even at the same sintering temperature. Moreover, all the chromaticity (x, y) of the LiBa{sub 0.03}PO{sub 4}:0.07Dy{sup 3+} phosphors are located in the white region (0.33, 0.37) even on using microwave-assisted sintering as the heat treatment did not influence the purity of LiBa{sub 0.03}PO{sub 4}:0.07Dy{sup 3+} phosphors. -- Highlights: • LiBaPO{sub 4}:Dy{sup 3+} phosphors were synthesized by microwave-assisted sintering and conventional sintering. • The microwave-assisted sintering improves the sintering behavior. • The microwave-assisted sintering provides a more uniform particle morphology. • The optimum concentration of Dy{sup 3+} for LiBaPO{sub 4} prepared by microwave-assisted sintering is 0.07. • All the chromaticity (x, y) of LiBa{sub 0.03}PO{sub 4}:0.07Dy{sup 3+} phosphors are located in the white region.

  12. Analysis of the Role of Peripheral Ligands Coordinated to Zn(II) in Enhancing the Energy Barrier in Luminescent Linear Trinuclear Zn-Dy-Zn Single-Molecule Magnets.

    Science.gov (United States)

    Costes, Jean Pierre; Titos-Padilla, Silvia; Oyarzabal, Itziar; Gupta, Tulika; Duhayon, Carine; Rajaraman, Gopalan; Colacio, Enrique

    2015-10-26

    Three new Dy complexes have been prepared according to a complex-as-ligand strategy. Structural determinations indicate that the central Dy ion is surrounded by two LZn units (L(2-) is the di-deprotonated form of the N2 O2 compartmental N,N'-2,2-dimethylpropylenedi(3-methoxysalicylideneiminato) Schiff base. The Dy ions are nonacoordinate to eight oxygen atoms from the two L ligands and to a water molecule. The Zn ions are pentacoordinate in all cases, linked to the N2 O2 atoms from L, and the apical position of the Zn coordination sphere is occupied by a water molecule or bromide or chloride ions. These resulting complexes, formulated (LZnX)-Dy-(LZnX), are tricationic with X=H2 O and monocationic with X=Br or Cl. They behave as field-free single-molecule magnets (SMMs) with effective energy barriers (Ueff ) for the reversal of the magnetization of 96.9(6) K with τ0 =2.4×10(-7)  s, 146.8(5) K with τ0 =9.2×10(-8)  s, and 146.1(10) K with τ0 =9.9×10(-8)  s for compounds with ZnOH2 , ZnBr, and ZnCl motifs, respectively. The Cole-Cole plots exhibit semicircular shapes with α parameters in the range of 0.19 to 0.29, which suggests multiple relaxation processes. Under a dc applied magnetic field of 1000 Oe, the quantum tunneling of magnetization (QTM) is partly or fully suppressed and the energy barriers increase to Ueff =128.6(5) K and τ0 =1.8×10(-8)  s for 1, Ueff =214.7 K and τ0 =9.8×10(-9)  s for 2, and Ueff =202.4 K and τ0 =1.5×10(-8)  s for 3. The two pairs of largely negatively charged phenoxido oxygen atoms with short DyO bonds are positioned at opposite sides of the Dy(3+) ion, which thus creates a strong crystal field that stabilizes the axial MJ =±15/2 doublet as the ground Kramers doublet. Although the compound with the ZnOH2 motifs possesses the larger negative charges on the phenolate oxygen atoms, as confirmed by using DFT calculations, it exhibits the larger distortions of the DyO9 coordination

  13. Experimental studies on BrO/Br ratios at Stromboli, Etna, Masaya, Gorely and Nyiragongo

    Science.gov (United States)

    Bobrowski, Nicole; Wittmer, Julian; Liotta, Marcello; Calabrese, Sergio; Giuffrida, Giovanni; Brusca, Lorenzo; Platt, Ulrich

    2014-05-01

    Since the discovery of BrO in a volcanic plume (Bobrowski et al. 2003) many measurements have been performed as well as modelling to understand the radical chemistry in volcanic plumes, in particular, the interaction between volcanic gas species, released under strongly reduced conditions, and the oxidizing atmosphere. Besides the goal in atmospheric chemistry to better determine the impact of volcanic emission (e.g. reactive bromine) on the local (and maybe global) scale, volcanologists also have an interest to understand if the BrO/SO2 ratios can be used as a monitoring parameter giving further insides in dynamic processes of volcanoes. One of the major advantages when utilizing BrO/SO2 ratios is the relatively easiness of the measurements, which can be taken in a safe distance from volcanic activity accompanied by a good temporal resolution partly even during explosive eruptions. Recently, it has been shown (Lübcke et al., 2013) that already existing automatically running measurement networks can now be used to gain long-term data sets of BrO/SO2 ratios. However, one of the arguments which potentially makes volcanological interpretations difficult is the reactivity of BrO. Therefore it is, of great importance to link the measurements of BrO and gaseous hydrogen bromide to the total emission flux of bromine in order to estimate the pristine gas composition released from magmas. In particular, meteorological influences, trace gas composition of the surrounding atmosphere and the volcanic gas composition can all potentially effect the formation of BrO and might have to be considered. Some of these factors potentially also influence near source in-situ measurement. We need to answer the question: Can we correlate BrO measurements to the total bromine outgassing? Only with this knowledge we can relate changes of the measured gas ratios (BrO/SO2) to the volcanic fluids emitted by the underlying magma and can interpret data as signals from depth, which provide insight

  14. Vahva ja erottuva brändi yrityksen kilpailuetuna : VihreäKeiju-brändin kuluttaja-asiakastutkimus

    OpenAIRE

    Merta, Helinä

    2011-01-01

    Brändi on kaikkien niiden mielikuvien ja tietojen summa, joita ihmisellä on jostain asiasta. Brändi syntyi 1700-luvun Amerikassa, jossa karja merkittiin polttomerkein (engl. brand), jotta jokainen erottaisi oman karjansa. Brändi tarkoittikin aluksi erilaistavaa tunnistetta tai symbolia. Nykyisin brändillä viitataan konkreettisiin ja mielikuvallisiin ominaisuuksiin, joiden avulla tuotteet erottuvat toisistaan. Brändiä rakentamalla pyritään kirkastamaan brändiin liitettyjä mielikuvia sekä er...

  15. 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 ...

  16. The BR2 high-flux reactor

    Energy Technology Data Exchange (ETDEWEB)

    Ponsard, Bernard [Belgian Nuclear Research Center (SCK-CEN), Mol (Belgium). BR2 Reactor

    2012-10-15

    The BR2 reactor is a 100 MW{sub th} High-Flux 'Material Testing Reactor' which first became operational in 1963 and has since been refurbished in 1995 to 1997. It is operated by the Belgian Nuclear Research Centre, SCK CEN, in the framework of programmes related to the development of structural materials and nuclear fuels for fission and fusion reactors. Serious maintenance efforts are currently made by SCK CEN to secure its safe operation until at least 2023. This would guarantee the continuity of the activities in which the BR2 reactor is involved through its replacement by an Accelerator Driven System (ADS), MYRRHA, scheduled to be operated by SCK CEN from 2023. (orig.)

  17. Fabrication, magnetostriction properties and applications of Tb-Dy-Fe alloys: a review

    Directory of Open Access Journals (Sweden)

    Nai-juan Wang

    2016-03-01

    Full Text Available As an excellent giant-magnetostrictive material, Tb-Dy-Fe alloys (based on Tb0.27-0.30Dy0.73-0.70Fe1.9-2 Laves compound can be applied in many engineering fields, such as sonar transducer systems, sensors, and micro-actuators. However, the cost of the rare earth elements Tb and Dy is too high to be widely applied for the materials. Nowadays, there are two different ways to substitute for these alloying elements. One is to partially replace Tb or Dy by cheaper rare earth elements, such as Pr, Nd, Sm and Ho; and the other is to use non-rare earth elements, such as Co, Al, Mn, Si, Ce, B, Be and C, to substitute Fe to form single MgCu2-type Laves phase and a certain amount of Re-rich phase, which can reduce the brittleness and improve the corrosion resistance of the alloy. This paper systemically introduces the development, the fabrication methods and the corresponding preferred growth directions of Tb-Dy-Fe alloys. In addition, the effects of alloying elements and heat treatment on magnetostrictive and mechanical properties of Tb-Dy-Fe alloys are also reviewed, respectively. Finally, some possible applications of Tb-Dy-Fe alloys are presented.

  18. Aging and mechanical properties of NR/BR blends

    Science.gov (United States)

    Chiu, Hsien-Tang; Tsai, Peir-An

    2006-02-01

    The mechanical properties and post-thermal aging properties of natural rubber (NR) and polybutadiene rubber (BR) blends at different blending ratios are investigated herein. The experimental results show that both tensile and tear strengths of NR/BR blends increase with increasing NR content. BR has a higher compression stiffness than NR. The deformation of BR is less than that of NR under the same load conditions. With regard to aging properties, both tensile stress and strain of NR/BR blends decrease after prolonged aging. In addition, the stress loss of BR is lower than that of NR, meaning that the aging resistance property of BR is superior to that of NR. Furthermore, accumulated thermal history has shifted the glass transition temperature (T g) of NR/BR blends toward lower temperatures while the loss tangent (tan δ) value increases with prolonged thermal aging.

  19. Decommissioning of the BR3 PWR

    Energy Technology Data Exchange (ETDEWEB)

    Massaut, V.; Klein, M

    1998-07-01

    The objectives, programme and main achievements of SCK-CEN's decommissioning programme in 1997 are summarised. Particular emphasis is on the BR3 decommissioning project. In 1997, auxiliary equipment and loops were dismantled; concrete antimissile slabs were decontaminated; the radiology of the primary loop was modelled; the quality assurance procedure for dismantling loops and equipment were implemented; a method for the dismantling of the reactor pressure vessel was selected; and contaminated thermal insulation of the primary loop containing asbestos was removed.

  20. BR10-Værktøj

    DEFF Research Database (Denmark)

    2011-01-01

    BR10 Værktøjet giver svar på hovedparten af de problemstillinger håndværkere og entreprenører støder på i anvendelsen af det nye Bygningsreglement i forbindelse med renoveringsopgaver. Værktøjet er let, praktisk og overskueligt, og du kan ved hjælp af alfabetiske lister over bygningsdele og...

  1. Energy Response of LaBr3

    Science.gov (United States)

    Ertürk, S.; Maj, A.; Ciemala, M.; Stezowski, O.; Courtin, S.; Strachan, J.; Kumar, S.; Paris Collaboration

    2012-09-01

    In recent years, important developments in scintillator technology have been made in the Lanthanum Halogen LaBr3 (Ce) crystal, which has high-energy separation, very good timing-properties and a stopping-power that can be used as a detector at room temperature. The international PARIS project will be created as a prototype of this detector system, which will be used in SPIRAL2 as a stand alone or in collaboration with the EXOGAM or AGATA detector array. A fusion evaporation reaction is used to produce exotic nuclei and is then transferred at a very high angular momentum to compound nuclei. Due to the accompanying high rotation, the exotic shape starts changing into vibrational and rotational collective phenomena which hitherto have together become difficult to detect and fully understand. In order to perform this type of research, in addition to conventional known gamma-ray detectors, high-efficiency gamma-ray detectors that can effectively identify gamma rays are also required as calorimeters. LaBr3 is planned to use such means. Results of ongoing analysis for energy and the time response of LaBr3 will be presented.

  2. 5-Br-PAN-6S的制备

    Institute of Scientific and Technical Information of China (English)

    任显钜; 周华凤

    2011-01-01

    本文合成了5-Br-PAN-6S,从α-氨基吡啶出发进行溴化得5-Br-2-氨基吡啶,在碱性条件下重氮化后,再与β-萘酚偶联得5-Br-PAN,在40-50℃的温度下,用发烟硫酸进行磺化生成5-Br-PAN-6S.

  3. Electrical properties of Schottky diodes based on high-resistance CdTe crystals

    International Nuclear Information System (INIS)

    Measurement of the Schottky barrier height on the CdTe monocrystals alloyed with the Cl, Br, J during the growth process is carried out through the method of chemical transport reactions. Verification of the efficiency of the proposed F(V) function modification with the purpose of determining the Me(In, Sn)-p-CdTe diodes parameters is accomplished. The Schottky barriers with the current transmission diffusion mechanism perspective for developing high-efficiency semiconducting detectors of nuclear radiation are created on the basis of the method for the gas-phase growth of the semiinsulating CdTe monocrystals

  4. Thermal expansion coefficient of glass and melts of Te-I system

    International Nuclear Information System (INIS)

    Volumetric thermal expansion coefficient (VTEC) was studied in glasses and melts of (TeI)1-x (T2I)x system in the range 293-773 K. During heating to glass transition temperature VTEC of all studied glasses don't depend on temperature. VTEC for melts don't depend on temperature. This points to more high rigidity of structure as compared with Te-Cl and Te-Br systems. More significant rigidity of structure in studied system is conditioned by strengthening of intermolecular interaction increasing density of chain cross-linking. VTEC of glasses in given system are close to corresponding values of chain polymers

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

    Indian Academy of Sciences (India)

    Amita Dua; Arun Bharti; S K Khosa

    2007-06-01

    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 obtained. The calculated results indicate that the observed onset of deformation in going from 154Dy to 166Dy arises due to enhanced occupation of (ℎ11/2) orbit, increased polarization of (5/2) orbit and increase in the occupation of down-slopping `' components of (13/2) and (ℎ9/2)υ orbits.

  6. Epitaxial growth and new phase of single crystal Dy by molecular beam epitaxy

    Energy Technology Data Exchange (ETDEWEB)

    Yang, Kai-Yueh; Homma, Hitoshi; Schuller, I.K.

    1987-09-01

    We have grown two novel epitaxial phases of dysprosium (Dy) on vanadium (V) by molecular beam epitaxy technique. Surface and bulk structures are studied by in-situ reflection high energy electron diffraction (RHEED) and x-ray diffraction techniques. The new hcp phases are approx.4% expanded uniformly in-plane (0001), and approx.9% and approx.4% expanded out of plane along the c-axes for non-interrupted and interrupted deposition case, respectively. We also observed (2 x 2), (3 x 3), and (4 x 4) Dy surface reconstruction patterns and a series of transitions as the Dy film thickness increases. 12 refs., 3 figs.

  7. Epitaxial film growth and metastable phases of single crystal Dy by molecular beam epitaxy

    Energy Technology Data Exchange (ETDEWEB)

    Yang, K.; Homma, H.; Schuller, I.K.

    1988-04-15

    We have grown two novel epitaxial phases of dysprosium (Dy) on vanadium (V) by the molecular beam epitaxy technique. Surface structures are studied by in situ reflection high-energy electron diffraction, and bulk structures are studied by x-ray diffraction after removal from the growth chamber. The new hcp phases are approx.4% expanded uniformly in the (0001) plane and approx.9% and approx.4% expanded out of plane, along the c axes, for noninterrupted and interrupted deposition cases, respectively. We also observed (2 x 2), (3 x 3), and (4 x 4) Dy surface reconstruction patterns and a series of structural changes as the Dy film thickness increases.

  8. Transparent glass-ceramics containing Eu3+ and Dy3+ ions for visible optoelectronics

    Science.gov (United States)

    Pisarska, Joanna; Żur, Lidia; Pisarski, Wojciech A.

    2011-06-01

    Selected oxyfluoride glasses containing Eu3+ and Dy3+ were heat treated in order to obtain transparent glass-ceramics. Visible emission spectra corresponding to 5D0 - 7FJ (J = 0, 1, 2, 3, 4) transitions of Eu3+ and 4F9/2 - 6HJ/2 (J = 11, 13, 15) transitions of Dy3+ in glass samples before and after heat treatment were registered. The luminescence intensity ratios R (Eu3+) and Y/B (Dy3+) have been analyzed in details. Their values are reduced due to part incorporation of rare earth ions into cubic β-PbF2 crystalline phase.

  9. Determination of Antimicrobial Activity of the Dyed Silk Fabrics with Some Natural Dyes

    OpenAIRE

    Alkan, Rezan; TORGAN, Emine; AYDIN, Canan; Karadag, Recep

    2015-01-01

    In this study, silk fabric is dyed with natural indigo. Dyed silk fabric with natural indigo was cut in the 20x20 cm2 size. Excluding a fabric, all fabrics were mordanted in the same percentage with alum metal (KAl(SO4)2.12H2O). Then, silk fabrics for green color dyeing are dyed separately with weld (Reseda luteola), gall oak (Quercus infectoria Olivier) and together weld (Reseda luteola) and gall oak (Quercus infectoria) in different percentage. Antimicrobial functionality of the twenty seve...

  10. Optical characterization of CdSe/Dy3+-doped silica matrices

    Indian Academy of Sciences (India)

    P V Jyothy; P R Rejikumar; Thomas Vinoy; S Kartika; N V Unnikrishnan

    2010-11-01

    Cadmium selenide nanocrystals along with dysprosium ions are doped in silica matrices through sol–gel route. The optical bandgap and size of the CdSe nanocrystals are calculated from the absorption spectrum. The size of the CdSe nanocrystallites is also evaluated from the TEM measurements. The fluorescence intensities are compared for SiO2–Dy3+ and CdSe-doped SiO2–Dy3+. The fluorescence intensity of Dy3+ is considerably increased in the presence of CdSe nanocrystals.

  11. SOFC brændselsceller i et intelligent elnet

    OpenAIRE

    Hjelm, Johan

    2015-01-01

    SOFC brændselsceller kan være med til at skabe balance i elnettet i takt med at elproduktionen i stigende grad baseres på sol og vind. Brændselscellerne kan kobles til naturgasnettet og på sigt bruge forskellige former for VE-gasser som brændstof.

  12. Scissors Mode of 162Dy Studied from Resonance Neutron Capture

    Directory of Open Access Journals (Sweden)

    Baramsai B.

    2015-01-01

    Full Text Available Multi-step cascade γ-ray spectra from the neutron capture at isolated resonances of 161Dy nucleus were measured at the LANSCE/DANCE time-of-flight facility in Los Alamos National Laboratory. The objectives of this experiment were to confirm and possibly extend the spin assignment of s-wave neutron resonances and get new information on photon strength functions with emphasis on the role of the M1 scissors mode vibration. The preliminary results show that the scissors mode plays a significant role in all transitions between accessible states of the studied nucleus. The photon strength functions describing well our data are compared to results from 3He-induced reactions, (n,γ experiments on Gd isotopes, and (γ,γ’ reactions.

  13. Scissors Mode of 162Dy Studied from Resonance Neutron Capture

    Science.gov (United States)

    Baramsai, B.; Bečvář, F.; Bredeweg, T. A.; Haight, R. C.; Jandel, M.; Kroll, J.; Krtička, M.; Mitchell, G. E.; O'Donnell, J. M.; Rundberg, R. S.; Ullmann, J. L.; Valenta, S.; Wilhelmy, J. B.

    2015-05-01

    Multi-step cascade γ-ray spectra from the neutron capture at isolated resonances of 161Dy nucleus were measured at the LANSCE/DANCE time-of-flight facility in Los Alamos National Laboratory. The objectives of this experiment were to confirm and possibly extend the spin assignment of s-wave neutron resonances and get new information on photon strength functions with emphasis on the role of the M1 scissors mode vibration. The preliminary results show that the scissors mode plays a significant role in all transitions between accessible states of the studied nucleus. The photon strength functions describing well our data are compared to results from 3He-induced reactions, (n,γ) experiments on Gd isotopes, and (γ,γ') reactions.

  14. Scissors Mode of 162 Dy Studied from Resonance Neutron Capture

    International Nuclear Information System (INIS)

    Multi-step cascade γ-ray spectra from the neutron capture at isolated resonances of 161Dy nucleus were measured at the LANSCE/DANCE time-of-flight facility in Los Alamos National Laboratory. The objectives of this experiment were to confirm and possibly extend the spin assignment of s-wave neutron resonances and get new information on photon strength functions with emphasis on the role of the M1 scissors mode vibration. The preliminary results show that the scissors mode plays a significant role in all transitions between accessible states of the studied nucleus. The photon strength functions describing well our data are compared to results from 3He-induced reactions, (n,γ) experiments on Gd isotopes, and (γ,γ') reactions

  15. Dry storage of the BR3 spent fuel in the Castor BR3 cask

    Energy Technology Data Exchange (ETDEWEB)

    Ooms, L.; Massaut, V.; Noynaert, L. [SCK/CEN, B-2400 Mol (Belgium); Braeckeveldt, M. [Niras/Ondraf, B-1210 Brussels (Belgium)

    2001-07-01

    Twenty-five years of operation has resulted in an inventory of spent fuel with a wide variety in the BR3 nuclear pilot power plant. Studies were launched to evaluate all possible solutions for the BR3 experimental and 'exotic' spent fuel, i.e. reprocessing, dry storage in containers and dry storage in canisters. For the BR3 spent fuel the interim dry storage in Castor BR3 containers was chosen. The present paper describes in a first part the history and characteristics of the spent fuel. A second part handles with the different options, which were studied for the spent fuel evacuation. The last part focuses on the spent fuel preparation and the production of the Castor BR3. This project allowed the SCK-CEN to build up an important know-how in the field of spent fuel management, especially the management of research reactor fuel, which is very specific and not comparable with spent fuel of commercial nuclear power plants. (author)

  16. Vaatemerkin brändin vaikutus vaatteiden ostoon

    OpenAIRE

    Orkamaa, Miro

    2014-01-01

    Opinnäytetyöni aiheena on tutkia, kuinka vaatemerkin brändi vaikuttaa vaatteiden ostamiseen Kemi-Tornion ammattikorkeakoulun opiskelijoiden keskuudessa. Opinnäytetyössäni pohdin kuluttajien ostokäyttäytymistä, itse ostoprosessia sekä brändiä, brändin merkitystä nyky-yhteiskunnassa ja brändikritiikkiä. Otan esimerkkejä brändeistä, jotka liittyvät vaateteollisuuteen ja ovat tunnettuja merkkejä. Tutkimusta varten suoritin kyselyn, jonka tavoitteena oli selvittää, kuinka paljon vaatemerkki j...

  17. Bi 2Te 3-Te nanocomposite formed by epitaxial growth of Bi 2Te 3 sheets on Te rod

    Science.gov (United States)

    Deng, Yuan; Cui, Chang-Wei; Zhang, Ni-La; Ji, Tian-Hao; Yang, Qing-Lin; Guo, Lin

    2006-05-01

    Single-crystal Bi 2Te 3-Te nanocomposites with heterostructure were synthesized using a two-step solvothermal process in the presence of ethylenediaminetetraacetic acid disodium salt. The first step is the formation of the Te nanorods and the second step is to grow the Bi 2Te 3 sheets off the Te rods surface to form the Bi 2Te 3-Te nanocomposites. The products were characterized by X-ray diffraction, scanning electron microscopy and transmission electron microscopy. We demonstrate a method of an epitaxial growth of Bi 2Te 3 nanosheets perpendicular to the axis of the central Te rod and a formation process of Bi 2Te 3-Te nanocomposites is also proposed.

  18. Communication: An unusual halogen-bonding motif: the LiBr···BrF dimer as a model system.

    Science.gov (United States)

    McDowell, Sean A C; Joseph, Jerelle A

    2012-11-01

    A stable complex, LiBr···BrF, is predicted in which the negative Br atom of LiBr is anchored to the Br atom of BrF by a halogen bond, while the positively charged Li atom interacts with the lone pair electron density on the Br atom of BrF in a direction roughly perpendicular to the halogen bond. As far as we are aware, this is the first reported instance of an atom of one diatomic molecule (Br of BrF) being bonded to two different, oppositely charged atoms (Li and Br) of another diatomic molecule (LiBr). Other less stable dimers of LiBr and BrF were predicted and compared with this novel complex. PMID:23145710

  19. Investigations of the effect of nonmagnetic Ca substitution for magnetic Dy on spin-freezing in Dy₂Ti₂O₇.

    Science.gov (United States)

    Anand, V K; Tennant, D A; Lake, B

    2015-11-01

    Physical properties of partially Ca substituted hole-doped Dy2Ti2O7 have been investigated by ac magnetic susceptibility χ(ac)(T), dc magnetic susceptibility χ(T), isothermal magnetization M(H) and heat capacity C(p)(T) measurements on Dy1.8Ca0.2Ti2O7. The spin-ice system Dy2Ti2O7 exhibits a spin-glass type freezing behavior near 16 K. Our frequency dependent χ(ac)(T) data of Dy1.8Ca0.2Ti2O7 show that the spin-freezing behavior is significantly influenced by Ca substitution. The effect of partial nonmagnetic Ca(2+) substitution for magnetic Dy(3+) is similar to the previous study on nonmagnetic isovalent Y(3+) substituted Dy(2-x)Y(x) Ti2O7 (for low levels of dilution), however the suppression of spin-freezing behavior is substantially stronger for Ca than Y. The Cole-Cole plot analysis reveals semicircular character and a single relaxation mode in Dy1.8Ca0.2Ti2O7 as for Dy2Ti2O7. No noticeable change in the insulating behavior of Dy2Ti2O7 results from the holes produced by 10% Ca(2+) substitution for Dy(3+) ions.

  20. Diffusion Raman et luminescence dans des aerogels de silice purs ou dopes Dy

    Science.gov (United States)

    Guerri, F.; Fabre, F.; Zwick, A.; Bournett, D.

    1994-02-01

    Light scattering studies of pure and Dy doped aerogels are presented. Careful examination of Stokes and anti-Stokes spectra allow the discrimination between Raman and luminescence processes. It is shown that in pure aerogels, scattered intensity is due to Raman processes only, and the density of vibrational states does not exhibit any singularity. The fractal properties of the structure imply modifications not only in the spectral distribution of the low frequency modes (usually labelled phonons and fractons) but alsoin the high frequency one, at least up to 600 cm-1. In Dy-doped dense silica, coupling between electronic and vibronic excitations is evidenced by the presence of anti-Stokes luminescence. In Dy-doped aerogels, the enlarged Dy3+ electronic levels, strongly coupled with vibrational states give rise to emission processes traducing the response of the sample as a whole, rather than resonant Raman scattering or luminescence processes.

  1. Rietveld Refinement of New Ternary Compound Al14Dy5Si

    Institute of Scientific and Technical Information of China (English)

    2006-01-01

    A new ternary compound Al14Dy5Si was discovered and studied by means of X-ray powder diffraction technique. The ternary compound Al14Dy5Si has a hexagonal BaPb3-type structure, space group R3m(No.166), the lattice parameters a=0.61482(1) nm, c=2.09780(2) nm. The crystal structure of the compound Al14Dy5Si was successfully refined by using Rietveld method from X-ray diffraction data. The R-factors of Rietveld refinement are Rp=0.091 and Rwp=0.120, respectively. The thermal dependence of the magnetization (M-T curves) for the compound was measured by a vibrating sample magnetometer. The experimentally determined magnetic effective paramagnetic moment is μeff=23.22 μB per formula unit (10.36 μB per Dy atom).

  2. 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...

  3. Dielectric Properties of Dy2O3 -Doped ( Ba, Sr) TiO3 Ceramics

    Institute of Scientific and Technical Information of China (English)

    Huang Xinyou; Gao Chunhua; Chen Xiangchong; Zheng Xialian; Huang Guojun; Liu Huiping

    2004-01-01

    The effects of Dy2O3 doping on the dielectric properties of (Ba, Sr)TiO3 series capacitor ceramics prepared using solid-state reaction method were studied. With the increasing of Dy2O3 additive , the dielectric constant (ε) of materials increases to a maximum when w(Dy2O3 ) is about 0.5% ,while the dielectric loss(tanδ) decreases. The BST ceramics with highε ( = 5245 ), low tanδ ( = 0. 0026 ) and high DC breakdown voltage ( = 5.5 mV ·m-1 ) were obtained. The influencing mechanism of Dy2O3 on the dielectric properties of (Ba, Sr)TiO3 ceramics was studied, thus providing the basis for preparation of capacitor ceramics.

  4. 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.

  5. Quantum efficiency of the luminescence of Eu(3), Tb(3) and Dy(3) in aqueous solutions

    International Nuclear Information System (INIS)

    The luminescence quantum efficiency of Eu(3), Tb(3) and Dy(3) in chloride solutions as well as complexed by aminopolyacetic acids was determined. An interpretation of the observed dependences in the system investigated has been proposed. (Authors)

  6. 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.

  7. Synthesis of Dy2O3 nanoparticles via hydroxide precipitation:effect of calcination temperature

    Institute of Scientific and Technical Information of China (English)

    Bahaa M. Abu-Zied; Abdullah M. Asiri

    2014-01-01

    This work described the preparation of dysprosium oxide, Dy2O3, nanoparticles using the homogeneous precipitation method. Dy3+ions were precipitated using NaOH solution. The obtained product was filtered, dried, and then calcined for 1 h at the temperature range of 300-700 °C in static air. The calcination temperature of the Dy-precursor was chosen based on its decomposi-tion as indicated by the TGA analysis. The crystalline structure and surface morphology of the calcined solids were studied by X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM) and X-ray pho-toelectron spectroscopy (XPS). The obtained results revealed that Dy2O3 with crystallites size of 11-21 nm was formed at 500 °C. Such value increased to 25-37 nm for the sample calcined at 700 °C.

  8. Dy3+ activated LaVO4 films synthesized by precursors with different solution concentrations

    Institute of Scientific and Technical Information of China (English)

    WU Dandan; MA Yongqing; ZHANG Xian; QIAN Shibing; ZHENG Ganhong; WU Mingzai; LI Guang; SUN Zhaoqi

    2012-01-01

    Using different-solution-concentration precursors with citric acid as chelating agent and polyvinyl alcohol as dispersing media,Dy3+ activated LaVO4 films were deposited on indium tin oxide (ITO) substrates.The scanning electronic microscope (SEM) showed that the compact and crack-free LaVO4:Dy3+ film could be obtained at a suitable solution concentration.The deposited films could absorb the ultraviolet light below 400 nm and were transparent in the visible and infrared region as evidenced by the transmission spectra,and the photoluminescence spectra exhibited the characteristic emissions of Dy3+ peaking at 484 (blue) and 576 (yellow) nm due to the transitions of 4F9/2→6H15/2 and 4Fg/2→6H13/2,respectively.The potential application of LaVO4:Dy3+ film in the dye-sensitized solar cell (DSSC) was also discussed.

  9. On the Reaction Mechanism of Br2 with OCS

    Institute of Scientific and Technical Information of China (English)

    Hai Tao YU; Hua ZHONG; Ming Xia LI; Hong Gang FU; Jia Zhong SUN

    2005-01-01

    The reaction mechanism of photochemical reaction between Br2 ( 1 ∑ ) and OCS ( 1 ∑ ) is predicted by means of theoretical methods. The calculated results indicate that the direct addition of Br2 to the CS bond of OCS molecule is more favorable in energy than the direct addition of Br2to the CO bond. Furthermore, the intermediate isomer syn-BrC(O)SBr is more stable thermodynamically and kinetically than anti-BrC(O)SBr. The original resultant anti-BrC(O)SBr formed in the most favorable reaction channel can easily isomerize into the final product syn-BrC(O)SBr with only 31.72 kJ/mol reaction barrier height. The suggested mechanism is in good agreement with previous experimental study.

  10. A single molecule magnet to single molecule magnet transformation via a solvothermal process: Fe4Dy2 → Fe6Dy3.

    Science.gov (United States)

    Chen, Sihuai; Mereacre, Valeriu; Anson, Christopher E; Powell, Annie K

    2016-01-01

    Two series of heterometallic Fe(III)-Ln(III) compounds, [FeLn(μ3-OH)2(mdea)4(m-NO2C6H4COO)8]·3MeCN where Ln = Y (1) and Dy (2) and [FeLn(μ4-O)3(μ3-O)(mdea)5(m-NO2C6H4COO)9]·3MeCN where Ln = Y (3) and Dy (4), were synthesized. Compounds 1 and 2 were obtained under ambient conditions, whereas 3 and 4 were obtained via a solvothermal transformation process by heating 1 or 2 at 120 °C in MeCN. The magnetic properties of all four compounds have been measured and show that compounds 2 and 4 containing Dy(III) ions exhibit slow relaxation of magnetization characteristic of Single Molecule Magnetic (SMM) behaviour.

  11. Genotoxic and cytotoxic damage by the therapeutic radiopharmaceutical [166Dy]Dy/166Ho-EDTMP as in vivo generator system

    International Nuclear Information System (INIS)

    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 [166Dy]Dy/166Ho-ethylenediaminetetramethylenephosphonate ([166Dy]Dy/166Ho-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 [166Dy]Dy/166Ho-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 166Dy2O3 enriched and it was add in form 166DyCI3 to the EDTMP in a softening media of phosphates (pH 8), the optimal molar relationship 166Dy: 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 radiochemical purity was 99% and in average the specific activity was of 1

  12. Multiple superhyperfine fields in a {DyFe2Dy} coordination cluster revealed using bulk susceptibility and (57)Fe Mössbauer studies.

    Science.gov (United States)

    Peng, Yan; Mereacre, Valeriu; Anson, Christopher E; Powell, Annie K

    2016-08-01

    A [DyFeDy(μ3-OH)2(pmide)2(p-Me-PhCO2)6] coordination cluster, where pmideH2 = N-(2-pyridylmethyl)iminodiethanol, has been synthesized and the magnetic properties studied. The dc magnetic measurements reveal dominant antiferromagnetic interactions between the metal centres. The ac measurements reveal zero-field quantum tunnelling of the magnetisation (QTM) which can be understood, but not adequately modelled, in terms of at least three relaxation processes when appropriate static (dc) fields are applied. To investigate this further, (57)Fe Mössbauer spectroscopy was used and well-resolved nuclear hyperfine structures could be observed, showing that on the Mössbauer time scale, without applied field or else with very small applied fields, the iron nuclei experience three or more superhyperfine fields arising from the slow magnetisation reversal of the strongly polarized fields of the Dy(III) ions. PMID:27424877

  13. Development of Li compound embedded with CaSO4:Dy TL pellet for neutron measurement

    International Nuclear Information System (INIS)

    Personal neutron dosimetry is quite a difficult area because a neutron is always accompanied with gamma radiation, which is required of a the capability for mixed field dosimetry. CaSO4: Dy phosphor is known to have a very high sensitivity to gamma, but the neutron capture cross section of the constituents of CaSO4:Dy are so small that the interactions between the thermal neutron and the phosphor are rare. One method to improve the neutron interaction is by introducing an impurity ion with a large thermal neutron captures cross section into the phosphor to act as a neutron target centre such as 6Li. In neutron-gamma mixed radiation fields, if two detectors for the 6Li-7Li compounds embedded CaSO4:Dy TL pellets are used, a 6Li-compound embedded pellet can detect the neutron and gamma radiation together, and the other pellet can only detect the gamma radiation. Recently Korea Atomic Energy Research Institute (KEARI) has developed a new type of CaSO4:Dy TL materials embedded with phosphorous (KCT-300) to detect beta and gamma radiation with a very high sensitivity. This paper presents the development of CaSO4:Dy TL pellets embedded with 6Li compound for a thermal neutron measurement, and the detection method of the neutron and gamma dose in mixed fields with CaSO4:Dy TL pellets embedded with a 6Li compound(KCT-306) and CaSO4:Dy TL pellets embedded with a 7Li compound(KCT-307) is introduced. The net neutron sensitivity of CaSO4:Dy TL pellets embedded with 6Li compound developed in this study is about 2 times higher than that of the TLD-600 (Harshaw Co.) dosimeter which is available in the open market

  14. An evaluation of photodegradation inhibitors in the conservation of naturally dyed historic silks.

    OpenAIRE

    Koussoulou, T.

    2008-01-01

    Photodegradation of naturally dyed historic silks is a problem that confronts many museums. It continues as long as the objects are displayed, as both ultraviolet and visible light are capable of causing degradation. Degradation may be seen in the fading of the dyes and in the loss of textile strength. Five photodegradation inhibitors were tested on silk dyed with natural red dyes and dye combinations in order to evaluate their ability to increase the light fastness. The selected additives be...

  15. The DY Conjugate Gradient Method with Armijo-type Line Searches

    Institute of Scientific and Technical Information of China (English)

    ShujunLian; ChangyuWang

    2004-01-01

    Two Armijo-type line searches are proposed in this paper for nonlinear conjugate gradient methods. The two Armijo-type line searches are shown to guarantee the global convergence of the DY method for the unconstrained minimization of nonconvex differentiable functions. Further, if the function is strictly convex, the two Armijo-type line searches and another Armijo-type line search are also shown to guarantee the convergence of the DY method.

  16. Research on the properties of dope-dyed bamboo pulp staple fibers

    Science.gov (United States)

    Zhang, Y. J.

    2016-07-01

    In order to understand the properties of the dope-dyed bamboo pulp staple fibers, the moisture regains, tensile properties, friction properties and electrical conductivity of them and the white bamboo pulp fiber were tested, compared and analyzed. The results show that the moisture regains of the dope-dyed bamboo pulp fibers are smaller than the white bamboo pulp fiber's, whereas their friction coefficients, breaking strengths and elongations and mass ratio resistances are a bit larger.

  17. 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.

  18. Anisotropic dependence of tune-out wavelength near Dy 741-nm transition

    CERN Document Server

    Kao, Wil; Burdick, Nathaniel Q; Lev, Benjamin L

    2016-01-01

    We report the first measurement of a tune-out wavelength for ground-state bosonic Dy and linearly polarized light. The tune-out wavelength measured is near the narrow-line 741-nm transition in $^{162}$Dy, and is the wavelength at which the total Stark shift of the ground state vanishes. We find that it strongly depends on the relative angle between the optical field and quantization axis due to Dy's large tensor polarizability. This anisotropy provides a wide, 22-GHz tunability of the tune-out frequency for linearly polarized light, in contrast to Rb and Cs whose near-infrared tune-out wavelengths do not exhibit large anisotropy. The measurements of the total light shift are performed by measuring the contrast of multipulse Kapitza-Dirac diffraction. The calculated wavelengths are within a few GHz of the measured values using known Dy electronic transition data. The lack of hyperfine structure in bosonic Dy implies that the tune-out wavelengths for the other bosonic Dy isotopes should be related to this $^{16...

  19. Physical and electrical characteristics of metal/Dy2O3/p-GaAs structure

    International Nuclear Information System (INIS)

    This paper describes the effect of post-deposition annealing on the physical and electrical characteristics of high-k Dy2O3 dielectric films deposited at 250 °C on p-GaAs substrate by electron beam deposition under ultra vacuum. The morphological and structural features of Dy2O3 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 Dy2O3 film is granular, and contains numerous contacts between columnar grains. While investigating the electrical properties Dy2O3 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 Dy2O3 annealed exhibited excellent electrical properties such as small density of interface state and low leakage current. This phenomenon is attributed to a rather crystallized Dy2O3 structure and the reduction of the defects at the oxide/GaAs interface.

  20. Optical and Physical Properties of Bismuth Borate Glasses Doped With Dy3+

    Directory of Open Access Journals (Sweden)

    P. Limsuwan

    2011-01-01

    Full Text Available This study reports on physical and optical properties of Dy3+ doped bismuth borate glass. The glasses containing Dy3+ in (70-xB2O3:30Bi2O3:xDy2O3 (where x = 0.0-2.5 mol% have been prepared by melt-quenching method. In order to understand the role of Dy2O3 in these glasses, the density, molar volume and optical spectra were investigated. The results show that molar volume of the glasses increase with the increasing of Dy2O3 concentration and consequently generating more non-bridging oxygen (NBOs into glass matrix. The absorption spectra of Dy3+ doped in bismuth borate glass correspond with several bands, which are assigned from the ground state, 6H15/2 to 6F3/2(761 nm, 6F5/2(806 nm, 6F7/2(907 nm, (6H7/2, 6F9/2(1099 nm, (6F11/2, 6H9/2 (1283 nm and 6H11/2(1695 nm. Moreover, the optical basicities were also theoretically determined.

  1. Dyed film dosimeters based on methyl orange dyed poly(vinyl alcohol) or poly(vinyl butyral) for high dose applications

    International Nuclear Information System (INIS)

    Complete text of publication follows. Dyed polymer films, prepared by simple technique if casting aqueous solution of PVA or PVB, containing methyl orange on horizontal glass are useful for high dose dosimetry. These films are bleached when exposed to gamma radiation. Different concentrations of chloral hydrate were added to a dyed polymer film to control the useful dose range of application. The radiation chemical yield G(value) was calculated for both PVA and PVB films. Temperature during irradiation was studied as well as the effect of humidity. These films are highly stable before and after irradiation under different storage conditions

  2. OntheDiophantineequation 3 2x ﹢8=Dy%关于Diophantine方程32x ﹢8=Dy

    Institute of Scientific and Technical Information of China (English)

    占金虎; 朱熙

    2015-01-01

    Let D be an odd prime.Proofed that if ( ﹚( ﹚D=3 8k﹢3 8k﹢4 ﹢1 ,where k is a nonnegative integer,then the equation 3 2x ﹢8=Dy has no positive integer.%证明了当D为奇素数,且(﹚(﹚D=38k﹢38k﹢4﹢1(其中:k是非负整数)时,方程x3﹢8=2Dy 无正整数解。

  3. Anticorrosion Performance of Carbon Steel in 55% LiBr Solution Containing PMA/SbBr3 Inhibitor

    Institute of Scientific and Technical Information of China (English)

    HU Xian-qi; LIANG Cheng-hao; HUANG Nai-bao

    2006-01-01

    The anticorrosion performance of carbon steel in 55% LiBr solution containing PMA/SbBr3 inhibitor was studied by weight-loss tests, electrochemical measurements and surface analysis. In 55%LiBr+PMA/SbBr3 solution, corrosion rates of carbon steel at 145 ℃, 175 ℃, 190 ℃ and 240 ℃ are 18.32 μm·a-1, 27.68 μm·a-1, 53.58 μm·a-1 and 73.78 μm·a-1, respectively. PMA/SbBr3 inhibitor may inhibit the corrosion of carbon steel in 55% LiBr solution effectively. Especially, it shows an excellent corrosion inhibition performance at high temperature. Both anodic and cathodic reactions of carbon steel may be inhibited by PMA/SbBr3 inhibitor, so it may be classified as mixed inhibitor. In 55%LiBr+PMA/SbBr3 solution, the apparent activation energy of the corrosion reaction of carbon steel is 29.61 kJ·mol-1. The corrosion inhibition mechanism of PMA/SbBr3 is suggested as follows: PMA has the effect of inhibiting hydrogen evolution and a strong oxidizing property; Sb3+ also exhibits oxidizing properties, and can exist stably with PMA in LiBr solutions; the passive film comprising Fe2O3 and antimony formed on carbon steel surface may prevent Br- from diffusing into the metal surface due to the synergistic effect of PMA and Sb3+; As a result, the anticorrosion performance of carbon steel may be improved by PMA/SbBr3 inhibitor in 55% LiBr solution.

  4. Electrochemical behaviors of Dy(III) and its co-reduction with Al(III) in molten LiCl-KCl salts

    International Nuclear Information System (INIS)

    In this work, the electrochemical behaviors of Dy(III) and its co-reduction with Al(III) on an inert tungsten electrode was investigated in LiCl-KCl molten salts at the temperature of 773 K by using cyclic voltammetry (CV), chronopotentiometry (CP) and square wave voltammetry (SWV) techniques. The results showed that the reduction of Dy(III) ions in LiCl-KCl salts is a reversible diffusion controlled process through a one-step reaction: Dy(III) + 3e− ↔ Dy(0). The diffusion coefficient of Dy(III) ions was calculated by both the CV and CP methods. Furthermore, the co-reduction of Al(III) and Dy(III) ions on the inert tungsten electrode allows Dy(III) ions to be reduced at a more positive potential through forming Al-Dy alloys. The concentration ratio of Al(III) cations to Dy(III) cations has a large impact on the formation of Al-Dy alloys. In a Dy(III) ion rich system, three signals attributed to the formation of Al-Dy intermetallic compounds were observed in CV and SWV analyses, while only two signals corresponding to Al-Dy intermetallic compounds were observed in the Dy(III) ion poor system. Potentiostatic and galvanostatic electrolyses performed on an aluminum electrode identified the co-reduction by the formation of one (Al3Dy) and two Al-Dy alloys (Al3Dy, AlDy), respectively. Finally, the electrolysis products were characterized by the Scanning Electron Microscopy (SEM) coupled with Energy Dispersive Spectroscopy (EDS) and X-ray diffraction (XRD) analyses

  5. 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.

  6. Brändi ja sen kehittäminen : Bränditutkimus ja brändinkehittämisehdotuksia kauppakeskus Elolle

    OpenAIRE

    Kumanto, Sofia

    2015-01-01

    Tämä työn tarkoituksena oli tutkia kauppakeskus Elon asiakkaiden brändimielikuvaa Elosta ja vastauksien perusteella koota brändinkehittämisehdotuksia. Tavoitteena on käyttää näitä tuloksia lisäämään kauppakeskus Elon johdon tietoa Elon brändistä heidän asiakkaiden näkökulmasta. Lisäksi tavoitteena on auttaa tämän tiedon ja työn sisältämien brändikehittämisehdotuksien pohjalta kehittämään Elon brändiä ja näin saada houkuteltua lisää asiakkaita kauppakeskukseen. Johdannossa esitellään kaup...

  7. Enhanced thermoelectric performance in the Rashba semiconductor BiTeI through band gap engineering

    International Nuclear Information System (INIS)

    Rashba semiconductors are of great interest in spintronics, superconducting electronics and thermoelectrics. Bulk BiTeI is a new Rashba system with a giant spin–split band structure. 2D-like thermoelectric response has been found in BiTeI. However, as optimizing the carrier concentration, the bipolar effect occurs at elevated temperature and deteriorates the thermoelectric performance of BiTeI. In this paper, band gap engineering in Rashba semiconductor BiTeI through Br-substitution successfully reduces the bipolar effect and improves the thermoelectric properties. By utilizing the optical absorption and Burstein–Moss-effect analysis, we find that the band gap in Rashba semiconductor BiTeI increases upon bromine substitution, which is consistent with theoretical predictions. Bipolar transport is mitigated due to the larger band gap, as the thermally-activated minority carriers diminish. Consequently, the Seebeck coefficient keeps increasing with a corresponding rise in temperature, and thermoelectric performance can thus be enhanced with a ZT  =  0.5 at 570 K for BiTeI0.88Br0.12. (paper)

  8. Enhanced thermoelectric performance in the Rashba semiconductor BiTeI through band gap engineering.

    Science.gov (United States)

    Wu, Lihua; Yang, Jiong; Zhang, Tiansong; Wang, Shanyu; Wei, Ping; Zhang, Wenqing; Chen, Lidong; Yang, Jihui

    2016-03-01

    Rashba semiconductors are of great interest in spintronics, superconducting electronics and thermoelectrics. Bulk BiTeI is a new Rashba system with a giant spin-split band structure. 2D-like thermoelectric response has been found in BiTeI. However, as optimizing the carrier concentration, the bipolar effect occurs at elevated temperature and deteriorates the thermoelectric performance of BiTeI. In this paper, band gap engineering in Rashba semiconductor BiTeI through Br-substitution successfully reduces the bipolar effect and improves the thermoelectric properties. By utilizing the optical absorption and Burstein-Moss-effect analysis, we find that the band gap in Rashba semiconductor BiTeI increases upon bromine substitution, which is consistent with theoretical predictions. Bipolar transport is mitigated due to the larger band gap, as the thermally-activated minority carriers diminish. Consequently, the Seebeck coefficient keeps increasing with a corresponding rise in temperature, and thermoelectric performance can thus be enhanced with a ZT  =  0.5 at 570 K for BiTeI0.88Br0.12.

  9. X-ray standing wave study of CdTe/MnTe/CdTe(001) heterointerfaces

    OpenAIRE

    Boulliard, Jean-Claude; Capelle, Bernard; Gualandris, Stéphane; Lifchitz, Alain; Cibert, Joel; Tatarenko, Serge

    1997-01-01

    The x-ray standing wave method is used to investigate some crystallographic features of the first stages of growth of ultrathin pseudomorphic MnTe(001) strained layers buried in CdTe on CdTe(001) substrates. Experiments with 004 and 113 reflecting planes show evidence of the presence of both MnTe clusters and diluted CdMnTe alloy.

  10. Brändi mielikuvien luojana : Case:IKU

    OpenAIRE

    Perkiö, Markus

    2012-01-01

    Brändi terminä on yleistynyt puhekielessä viimeisten vuosikymmenien aikana. Brändiä käytetään kuvaamaan esineitä, asioita, yrityksiä, ihmisiä tai ideologiaa. Tässä opinnäytetyössä perehdyttiin brändiin ilmiönä, brändin luomiseen sekä sen erottumiseen kilpailijoistaan. Opinnäytetyössä tarkasteltiin brändiä työkaluna uuden artistin esille tuomisessa kohderyhmälleen sekä suurelle yleisölle. Vaikka brändi termiä käytetään hyvin laajasti puhekielessä, se usein liitetään virheellisesti johonkin...

  11. Redetermination of tantalum pentabromide, (TaBr52

    Directory of Open Access Journals (Sweden)

    Katja Habermehl

    2010-09-01

    Full Text Available Crystals of di-μ-bromido-bis[tetrabromidotantalum(V], (TaBr52, were obtained by recrystallization at 773 K. A first crystal structure study of (TaBr52 was reported by Rolsten [J. Am. Chem. Soc. (1958, 80, 2952–2953], who analysed the powder diffraction pattern and came to the conclusion that it crystallizes isotypically with (NbBr52 in a primitive orthorhombic cell. These findings are not in agreement with our current results of a monoclinic C-centred structure. (TaBr52 is isotypic with α-(NbCl52. The crystal structure contains [TaBr6] octahedra sharing common edges forming [TaBr5]2 dimers. Two crystallographically independent dimers with symmetries m and 2/m and Ta...Ta distances of 4.1574 (11 and 4.1551 (15 Å, respectively, are present in the structure.

  12. SOFC brændselsceller i et intelligent elnet

    DEFF Research Database (Denmark)

    Hjelm, Johan

    2015-01-01

    SOFC brændselsceller kan være med til at skabe balance i elnettet i takt med at elproduktionen i stigende grad baseres på sol og vind. Brændselscellerne kan kobles til naturgasnettet og på sigt bruge forskellige former for VE-gasser som brændstof.......SOFC brændselsceller kan være med til at skabe balance i elnettet i takt med at elproduktionen i stigende grad baseres på sol og vind. Brændselscellerne kan kobles til naturgasnettet og på sigt bruge forskellige former for VE-gasser som brændstof....

  13. Yrityksen brändi-imago ja -identiteetti

    OpenAIRE

    Anttonen, Jaakko

    2008-01-01

    Tämä opinnäytetyö käsittelee brändiä, brändi-imagoa ja -identiteettiä. Opinnäytetyö tehtiin Viikko-Häme Oy:n toimeksiantona. Opinnäytetyön tutkimusongelma oli selvittää, millaisia sanomalehti Viikko-Hämeen tämänhetkiset brändi-imago ja brändi-identiteetti ovat ja miten niitä voisi kehittää. Brändi on yritys, tuote tai palvelu, jolla on jonkinlaista lisäarvoa kuluttajalle, minkä vuoksi se erottuu edukseen markkinoilla. Vahva ja tunnettu brändi herättää kuluttajassa luottamusta ja on näin lupau...

  14. Corrosion inhibition performance of a ionic liquid surfactant Br

    OpenAIRE

    Jing LIU; Dishun ZHAO; LIU, RAN; Wang, Ming; Peibing REN

    2016-01-01

    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 ...

  15. 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

  16. MTR fuel testing in BR2

    International Nuclear Information System (INIS)

    New fuel design for MTR 's requires to be qualified under representative conditions, that is geometry, neutron spectrum, heat flux and thermo hydraulic conditions. An irradiation device for fuel plates has been designed to derive the maximum benefit from the BR2 irradiation capacities. The fuel plates can be easily extracted from their support during a shutdown to undergo additional tests. One of these tests is the measurement of the thickness changes along the fuel plate. To that purpose, a facility in the reactor water pool has been designed to measure the fuel swelling with an accuracy of 5 μm using inductive probes. At SCK-CEN, the full range of destructive and non-destructive PIE can be performed, including γ-scanning, wet sipping, surface examination and other methods. (author)

  17. 关于丢番图方程x3±8=Dy2%Studies on the Diophantine Equation x3±8=Dy2

    Institute of Scientific and Technical Information of China (English)

    万飞; 杜先存

    2013-01-01

    Letting D be an odd prime of the form 6k+1 , using the elementary method, we proved that the Diophantine equation x3+8= 2Dy )(x, y∈N has no integer solutions with gcd(x, y)=1, where D≡19 (mod 24) . In addition, we also prove that the Diophantine equation x3−8= 2Dy ( , )x y∈N has no integer solutions with gcd(x, y) =1, where D≡1 (mod 24) .%利用初等方法证明了:若D≡19(mod 24)为奇素数,则丢番图方程2x3+8=Dy 无gcd(x, y)=1的正整数解;若D≡1(mod 24)为奇素数,则丢番图方程2x3−8=Dy 无gcd(x, y)=1的正整数解。

  18. Thermodynamic modeling of the RE–Pb (RE = Sc, Dy, Gd) systems

    Energy Technology Data Exchange (ETDEWEB)

    Iddaoudi, A., E-mail: iddaoudi19@gmail.com [Laboratoire de Thermodynamique et Energétique, LTE, Université Ibn-Zohr, B.P. 8106 Agadir (Morocco); Servant, C., E-mail: colette.servant@orange.fr [Laboratoire de Physicochimie de l’Etat Solide, ICMMO, Université Paris-Sud, 91405 Orsay Cedex (France); Selhaoui, N.; Kardellass, S.; Mahdouk, K.; Bouirden, L. [Laboratoire de Thermodynamique et Energétique, LTE, Université Ibn-Zohr, B.P. 8106 Agadir (Morocco)

    2014-03-15

    Highlights: • Rare earth (RE) and Pb alloys or compounds are interesting as magnetic materials. • The phase diagrams and thermodynamic properties of RE–Pb (RE = Sc, Dy, Gd) systems have been assessed. • The CALPHAD method was used with the Redlich–Kister model to optimize the solution phases. • A self-consistent set of thermodynamic parameters has been evaluated. • A good agreement was found between the calculation and experiments. -- Abstract: The phase diagrams and thermodynamic properties of RE–Pb (RE = Sc, Dy, Gd) systems have been assessed by means of the CALPHAD method. The solution phases (liquid, fcc, bcc and hcp) were described by the sublattice formalism and the excess term of the Gibbs energy with the Redlich–Kister equation. The stoichiometric intermetallic compounds (Sc{sub 5}Pb{sub 3}, Sc{sub 6}Pb{sub 5}, Dy{sub 5}Pb{sub 4}, DyPb, DyPb{sub 2}, DyPb{sub 3}, β-Gd{sub 5}Pb{sub 4}, α-Gd{sub 5}Pb{sub 4}, Gd{sub 11}Pb{sub 10}, Gd{sub 6}Pb{sub 7}, GdPb{sub 2} and GdPb{sub 2}) were modeled as line compounds. The non-stoichiometric Dy{sub 5}Pb{sub 3} and Gd{sub 5}Pb{sub 3} phases with a narrow homogeneity range were modeled using a two-sublattice model with substitution. A consistent set of the thermodynamic parameters leading to a reasonable agreement between the calculated results and literature data was obtained.

  19. The thermoluminescence of BaF2:Dy

    International Nuclear Information System (INIS)

    Barium fluoride doped with dysprosium has been found to exhibit intense thermoluminescence. The glow curve has dominant peaks at 1200C and 2500C. The two peaks are isolated sufficiently well that they may be instrumented separately using temperature discriminators. The 1200C peak is very bright and, since incandescence is trivial, can be used to measure exposures of a few microroentgen of energetic gamma rays. Where stability over long periods or at higher temperatures is required, the high temperature peak may be used. A low temperature trap exists at about 600C. The trap is effectively emptied in five minutes at room temperature. The 1200C trap is useful without correction for times after exposure up to three hours and can be corrected for fade for times up to 200 hours. The principle application of BaF2:Dy is in x-ray detection. It exhibits an overresponse of approximately 100 at 70 kev, providing high discrimination against energetic gamma rays and cosmic ray background. Supralinearity is observed in the 1200C trap for exposures of 10 R and above and in the 2500C trap for exposures of 1R and above. The material is useful with linearity correction up to 104R. Supralinearity can be annealed for re-use of the crystal by baking at 4000C for one hour. (author)

  20. Magnetoluminescence of CdTe/MnTe/CdMgTe heterostructures with ultrathin MnTe layers

    Energy Technology Data Exchange (ETDEWEB)

    Agekyan, V. F., E-mail: vfag@rambler.ru [St. Petersburg State University, Fock Institute of Physics (Russian Federation); Holz, P. O. [Polish Academy of Sciences, Institute of Physics (Poland); Karczewski, G. [Linkoeping University (Sweden); Katz, V. N. [St. Petersburg State University, Fock Institute of Physics (Russian Federation); Moskalenko, E. S. [Russian Academy of Sciences, Ioffe Physical Technical Institute (Russian Federation); Serov, A. Yu.; Filosofov, N. G. [St. Petersburg State University, Fock Institute of Physics (Russian Federation)

    2011-10-15

    CdTe/MnTe/CdMgTe quantum-well structures with one or two monolayers of MnTe inserted at CdTe/CdMgTe interfaces were fabricated. The spectra of the excitonic luminescence from CdTe quantum wells and their variation with temperature indicate that introduction of ultrathin MnTe layers improves the interface quality. The effect of a magnetic field in the Faraday configuration on the spectral position of the exciton-emission peaks indicates that frustration of magnetic moments in one-monolayer MnTe insertions is weaker than in two-monolayer insertions. The effect of a magnetic field on the exciton localization can be explained in terms of the exciton wave-function shrinkage and obstruction of the photoexcited charge-carrier motion in the quantum well.

  1. BrO measurements over the Eastern North-Atlantic

    Directory of Open Access Journals (Sweden)

    M. Martin

    2009-04-01

    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 was, 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 are 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 the African coast.

  2. 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.

  3. Kvinnors upplevelser av att leva med bröstcancer

    OpenAIRE

    Music, Sanela

    2010-01-01

    Bakgrund: Bröstcancer utgör en tredjedel av all cancer som kvinnor drabbas av. Tidigare studier indikerar att kvinnor upplever mycket starka känslor kring sjukdomen bröstcancer och att de har drabbats av den. Tanken av att förlora ett bröst är en av punkterna som bringar mycket ångest och lidande. Syfte: Syftet med studien är att belysa kvinnors upplevelser av att leva med bröstcancer. Metod: En litteraturstudie med självbiografiska böcker har utförts. Studiens syfte har besvarats genom att t...

  4. Brändin rakentaminen : case Dressing Mimia

    OpenAIRE

    Rinne, Helena

    2011-01-01

    Opinnäytetyö käsittelee sitä miten brändi rakennetaan ja mistä elementeistä brändikuva muodostuu. Tutkimuskohteena oli Dressing Mimia -tapahtuman brändikuva. Dressing Mimia -tapahtuma on poikkitaiteellinen muotinäytös ja cocktailtilaisuus, joka järjestetään kerran vuodessa Turussa. Työn tavoitteena oli selvittää millaisia mielikuvia tapahtuman asiakkailla on tapahtumasta sekä saada taustatietoa tapahtumassa kävijöistä. Tulosten perusteella voidaan kehittää Dressing Mimian brändiarvoa ja koota...

  5. Growth and process optimization of GdTe and GdZnTe polycrystalline films for high efficiency solar cells

    Energy Technology Data Exchange (ETDEWEB)

    Rohatgi, A.; Sundharsanan, R.; Ringel, S.A.; MacDougal, M.H. (Georgia Inst. of Tech., Atlanta (USA). School of Electrical Engineering Georgia Inst. of Tech., Atlanta, GA (USA). Microelectronics Research Center)

    1991-05-01

    Polycrystalline CdTe solar cells with efficiencies of approximately 10% were achieved by metal organic chemical vapor deposition growth of CdTe on glass/SnO{sub 2}/CdS substrates. An in situ pre-heat treatment of the CdS substrate at 450deg C in an H{sub 2} ambient was found to be essential for high performance devices because it removes oxygen-related defects on the CdS surface. This heat treatment also results in a cadmium-deficient CdS surface which may, in part, limit the CdTe cell efficiency to 10% owing to cadmium vacancy related interface defects. The CdCl{sub 2} treatment used in CdTe cell processing was found to promote grain growth, reduce series resistance and interface state density, and change the dominant current transport mechanism from thermally assisted tunneling and recombination via interface states to recombination in the depletion region. These beneficial effects resulted in an increase in the CdTe/CdS cell efficiency from around 2% to approximately 9%. In addition to the CdTe cells, polycrystalline 1.7 eV CdZnTe films were grown by molecular beam epitaxy for tandem cell applications. CdZnTe/CdS cells processed using the standard CdTe cell fabrication procedure resulted in 4.4% efficiency, high series resistance, and a band gap shift to 1.55 eV. Formation of Zn-O at and near the CdZnTe surface was found to be the source of high contact resistance. A saturated dichromate etch instead of the Br{sub 2}:CH{sub 3}OH etch prior to contact deposition was found to solve the contact resistance problem. The CdCl{sub 2} treatment was identified to be the cause of the observed band gap shift owing to the preferred formation of ZnCl{sub 2}. A model for the band gap shift along with a possible solution using an overpressure of ZnCl{sub 2} in the annealing ambient is proposed. Development of a sintering aid which promotes grain growth and preserves the optimum 1.7 eV band gap is shown to be the key to successful wide gap CdZnTe cells. (orig.).

  6. Investigation of complexes with bone affinity using the In vivo generator system 166 Dy/166 Ho

    International Nuclear Information System (INIS)

    The importance of this original research lies in the fact that it has proven that the [166Dy]Dy/166Ho-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 166Ho-DOTMP or 153Sm-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 166Dy/166Ho; to evaluate the in vitro and in vivo stability of both 166Dy-EDTMP and 166Ho-EDTMP complexes when the daughter 166Ho 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 [166Dy]Dy/166Ho-EDTMP in vivo generator system. 166Dy was obtained by neutron irradiation of enriched 164Dy2O3 in a TRIGA Mark III reactor. Labeling was carried out in an aqueous phosphate medium at pH 8.0 by addition of 166DyCl3 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 166Dy/166Ho-EDTMP is unstable after dilution in saline but stable in human serum with no translocation of the daughter nucleus subsequent to β decay of 166Dy, which could release free 166Ho3+. Biodistribution in mice, after I.V. administration

  7. Thermodynamic investigations of CdTe-HgTe solid solutions

    Energy Technology Data Exchange (ETDEWEB)

    Nasar, A.; Shamsuddin, M. (Dept. of Metallurgical Engineering, Banaras Hindu Univ., Varanasi (India))

    1991-08-10

    The activity of CdTe in pseudobinary CdTe-HgTe solid solution (with CdTe added in 10 mol.% increments) has been determined in the temperature range 735-840 K by an electrochemical technique using LiCl-KCl+5 wt.% CdCl{sub 2} as the molten salt electrolyte. The activity of HgTe has been calculated by Gibbs-Duhem integration using the {alpha} function. From the e.m.f. values measured at different temperatures, various partial and excess thermodynamic quantities, namely {Delta}anti G{sup M}{sub CdTe}, {Delta}anti H{sup M}{sub CdTe}, {Delta}anti S{sup XS}{sub CdTe}, {Delta}anti G{sup XS}{sub CdTe} and {Delta}anti S{sup XS}{sub CdTe}, have been obtained. The corresponding thermodynamic parameters for HgTe have also been computed. The integral molar properties of the solid solutions have been estimated from the partial quantities of the two components, CdTe and HgTe. (orig.).

  8. Yrityksen brändin kehittäminen : Medbit Oy:n brändiuudistus

    OpenAIRE

    Salminen, Valtteri

    2016-01-01

    Opinnäytetyö tehtiin toimeksiantona ICT-alalla toimivalle Medbit Oy:lle. Yritys teki brändiuudistuksen vuoden 2015 alkupuolella ja halusi selvittää, miten asiakkaat, yhteistyökumppanit ja henkilökunta ovat ottaneet uudistuksen vastaan. Opinnäytetyössä perehdyttiin bränditutkimuksen lisäksi tutkimuksen kannalta olennaisiin aiheisiin brändin teoriasta. Brändiä käsittelevän tietoperustan avulla selvitettiin, mitä brändillä tarkoitetaan, millainen on hyvä brändi ja mitä hyötyjä siitä on yrityksel...

  9. 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)

  10. Synthesis and luminescence characteristics of Dy{sup 3+} doped KLa(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.

    2015-10-15

    Polycrystalline powders of KLa{sub (1−x)}Dy{sub x}(PO{sub 3}){sub 4} (x=0.5%, 1%, 5% and 10%) with linear chain have been grown by solid state reaction. The obtained powders are characterized by X-ray powder diffraction, FTIR and Raman spectroscopies. Emission, excitation spectra and decay curves analysis have been used to study the spectroscopic properties of Dy{sup 3+} in KLa(PO{sub 3}){sub 4}. The photoluminescence spectra show two characteristic blue and yellow bands of Dy{sup 3+}. The yellow-to-blue emission intensity ratios and CIE chromaticity coordinates have been determined from emission spectra to evaluate the emitted light as function of Dy{sup 3+} concentration. The measured decay rates for {sup 4}F{sub 9/2}→{sup 6}H{sub 15/2} deviated from exponential to non-exponential shape with increase of Dy{sup 3+} concentration. The observed non-exponential behavior of the decay curve has been fitted to Inokuti–Hirayama model, which indicates that the energy transfer between the donor and the acceptor is of dipole–dipole nature. The energy transfer, between the donor (excited Dy{sup 3+}) and the acceptor (unexcited Dy{sup 3+}), increases with Dy{sup 3+} ions concentration. - Highlights: • Polycrystalline powders of KLa{sub (1−x)}Dy{sub x}(PO{sub 3}){sub 4} were grown by solid state reaction. • The obtained samples are characterized by XRD, FTIR and Raman spectroscopies. • The luminescent properties of Dy{sup 3+} in KLa(PO{sub 3}){sub 4} are investigated. • Lifetime and chromatic coordinates depend strongly on Dy{sup 3+} concentration. • White and blue emissions are obtained at high and low concentration, respectively.

  11. Two new Dy3 triangles with trinuclear circular helicates and their single-molecule magnet behavior.

    Science.gov (United States)

    Lin, Shuang-Yan; Zhao, Lang; Guo, Yun-Nan; Zhang, Peng; Guo, Yang; Tang, Jinkui

    2012-10-15

    Self-assembly of polydentate Schiff base 2,6-diformyl-4-methylphenol di(benzoy1hydrazone) (H(3)L), with dysprosium thiocyanate and sodium azide, affords two novel trinuclear triangular circular helicate dysprosium(III) complexes, [Dy(3)(μ(3)-OCH(3))(2)(HL)(3)(SCN)]·4CH(3)OH·2CH(3)CN·2H(2)O (1) or [Dy(3)(μ(3)-N(3))(μ(3)-OH)(H(2)L)(3)(SCN)(3)](SCN)·3CH(3)OH·H(2)O (2), depending on the presence or absence of base. Single-crystal X-ray analyses show that two μ(3)-methoxy oxygens cap the Dy(3) triangle in complex 1 and that one μ(3)-OH and one μ(3)-N(3)(-) cap the Dy(3) triangle of complex 2, representing the first example of a μ(3)-N(3)(-)-capped lanthanide complex reported to date. Ac susceptibility measurements reveal that multiple relaxation processes and the onset of slow magnetization relaxation occur for complex 1 and 2, respectively. Theoretical calculations are required to elucidate the underlying mechanism; however, the different magnetic anisotropy of the respective structures, which is dictated by the coordination environment of Dy(III) ions and structural parameters of the triangles, is mostly responsible for the distinctive relaxation dynamics observed. PMID:22510150

  12. Hydrothermal preparation and persistence characteristics of nanosized phosphor SrS: Eu2+, Dy3+

    Institute of Scientific and Technical Information of China (English)

    DUAN Xiaoxia; HUANG Shihua; YOU Fangtian; KANG Kai

    2009-01-01

    Nanosized long-persistent phosphors SrS: Eu2+, Dy3+ were prepared by the hydrothermal method. The samples were characterized by X-ray powder diffraction, transmission electron microscopy, and charge-coupled device spectrometry. The persistence characteristic was studied using the decay curves. The results showed that the emission intensity decreased sharply with temperature increasing, although the particle size increased. The S2- vacancies caused by oxidization served as shallow traps, and Dy3+ served as deep traps in SrS: Eu2+, Dy3+. The afterglow intensity of SrS: Eu2+, Dy3+ was higher than that of SrS: Eu2+ prepared at the same temperature. However, the minimization span of initial afterglow with temperature for the former sample was larger than that for the latter. Binary-doped phosphor decayed more slowly than the singly doped one. The afterglow of SrS: Eu2+, Dy3+ decayed more quickly with the increase of sintering temperature.

  13. Microstructures and mechanical properties of Mg–Zn–Zr–Dy wrought magnesium alloys

    Indian Academy of Sciences (India)

    Z H Huang; W J Qi; K H Zheng; X M Zhang; M Liu; Z M Yu; J Xu

    2013-06-01

    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 increases gradually, while MgZn2 phase decreases gradually to disappear. As-cast microstructure is refined gradually; meanwhile extruded one is refined further with decreasing average grain size to 1 m for ZK60–4.32Dy alloy. Second phase, tending to distribute along grain boundary by continuous network in as-cast state, breaks and distributes dispersedly in extrusion state. As-cast tensile mechanical property remains almost unchanged at ambient temperature; however, extruded ones are enhanced significantly at ambient and elevated temperatures, respectively. Tensile strength at 298 and 473 K increases gradually from 355 and 120 MPa for ZK60 alloy to 395 and 171 MPa for ZK60–4.32Dy alloy, respectively. Extruded tensile fractures exhibit a typical character of ductile fracture.

  14. 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.

  15. Thermodynamic assessment of the Bi–Er and the Bi–Dy systems

    Energy Technology Data Exchange (ETDEWEB)

    Wang, Jinsan [School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083 (China); Li, Changrong, E-mail: crli@mater.ustb.edu.cn [School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083 (China); Guo, Cuiping; Du, Zhenmin [School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083 (China); Wu, Bo [School of Materials Science and Engineering, Fuzhou University, Fuzhou 350100 (China)

    2013-08-20

    Highlights: • The Bi–Er and Bi–Dy binary systems were optimized. • The first-principles method was used to calculate formation enthalpies of compounds. • A self-consistent set of thermodynamic parameters were obtained. • The experimental and calculated data were well reproduced by the optimized results. - Abstract: Based on the available experimental data, the Bi–Er and the Bi–Dy binary systems have been assessed thermodynamically using the CALPHAD (CALculaton of PHAse Diagram) technique. The formation enthalpies at 0 K of the compounds, Bi{sub 3}Er{sub 5}, BiEr, Bi{sub 3}Dy{sub 5} and BiDy, were calculated by the first-principles method and Birch–Murnaghan equation of state, and the calculated results were used in the present thermodynamic optimization. All these compounds in the Bi–Er and the Bi–Dy systems were treated as stoichiometric compounds. The liquid phase was modeled as a substitutional solution phase based on random mixing of the constituent atoms and the excess Gibbs energy was formulated with the Redlich–Kister polynomial. Good agreements were obtained between the calculated results and the experimental data for both the thermochemical properties and the phase equilibrium relations.

  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. 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.

  18. Heterometallic Cu(II)-Dy(III) Clusters of Different Nuclearities with Slow Magnetic Relaxation.

    Science.gov (United States)

    Modak, Ritwik; Sikdar, Yeasin; Cosquer, Goulven; Chatterjee, Sudipta; Yamashita, Masahiro; Goswami, Sanchita

    2016-01-19

    The synthesis, structures, and magnetic properties of two heterometallic Cu(II)-Dy(III) clusters are reported. The first structural motif displays a pentanuclear Cu(II)4Dy(III) core, while the second one reveals a nonanuclear Cu(II)6Dy(III)3 core. We employed o-vanillin-based Schiff base ligands combining o-vanillin with 3-amino-1-propanol, H2vap, (2-[(3-hydroxy-propylimino)-methyl]-6-methoxy-phenol), and 2-aminoethanol, H2vae, (2-[(3-hydroxy-ethylimino)-methyl]-6-methoxy-phenol). The differing nuclearities of the two clusters stem from the choice of imino alcohol arm in the Schiff bases, H2vap and H2vae. This work is aimed at broadening the diversity of Cu(II)-Dy(III) clusters and to perceive the consequence of changing the length of the alcohol arm on the nuclearity of the cluster, providing valuable insight into promising future synthetic directions. The underlying topological entity of the pentanuclear Cu4Dy cluster is reported for the first time. The investigation of magnetic behaviors of 1 and 2 below 2 K reveals slow magnetic relaxation with a significant influence coming from the variation of the alcohol arm affecting the nature of magnetic interactions. PMID:26702645

  19. Properties of Dy 3+-doped PbWO 4 single crystal grown by modified Bridgman method

    Science.gov (United States)

    Huang, Yanlin; Zhu, Wenliang; Feng, Xiqi; Duan, Yong; Man, Zhenyong

    2003-01-01

    Undoped and Dy 3+-doped PbWO 4 single crystals were grown in the same condition by modified Bridgman method. Optical transmittance, X-ray excited luminescence, excitation and emission under UV light, thermoluminescence glow curves and X-ray pulsed excited decays were investigated on Dy 3+:PWO for the first time. Dy 3+-doping has a positive effect similar to that of rare-earth ions La 3+ and Gd 3+, such as improvement of transmittance in the wavelength region of scintillation emission (350-450 nm), compensation of trapping centers that is reflected in the thermoluminescence characteristics and suppression of slow decay component in luminescence kinetics. Analysis of luminescence spectra indicates that energy transfer could take place from the PbWO 4 host to the Dy 3+ ions, followed by characteristic emission line assigned to transition from 4F 9/2 of Dy 3+ ion to lower lying states on basis of the energy level scheme. A tentative concept of energy transfer mechanism is proposed in this paper.

  20. Electrodeposition of a Au-Dy2O3 Composite Solid Oxide Fuel Cell Catalyst from Eutectic Urea/Choline Chloride Ionic Liquid

    OpenAIRE

    Claudio Mele; Benedetto Bozzini

    2012-01-01

     In this research we have fabricated and tested Au/Dy2O3 composites for applications as Solid Oxide Fuel Cell (SOFC) electrocatalysts. The material was obtained by a process involving electrodeposition of a Au-Dy alloy from a urea/choline chloride ionic liquid electrolyte, followed by selective oxidation of Dy to Dy2O3 in air at high temperature. The electrochemical kinetics of the electrodeposition bath were studied by cyclic voltammetry, whence optimal electrodeposition conditions ...

  1. Photoluminescence Properties and Energy Transfer in a Novel Yellow Emitting Phosphor GdTaO4: Dy3+.

    Science.gov (United States)

    Zhang, Hijuan; Tan, Xinyu; Wang, Yuhua

    2016-04-01

    The phosphor Dy3+ doped M type gadolinium orthotantalate GdTaO4 was prepared successfully by traditional solid state reaction and the photoluminescence of GdTaO4: xDy3+ (0.01 ≤ x ≤ 0.10) has been investigated under ultraviolet and vacuum ultraviolet excitation. In the excitation spectra of GdTaO4: Dy3+, the overlap appears between the host lattice excitation, the excitation lines of Gd3+ and the f-f transitions of Dy3+, which indicates that the energy transfer could occur from the host to the Dy3+ ions. In the emission spectra of the samples, the intense emissions of Dy3+ have been expectably revealed both upon excitation at 365 nm and 147 nm. And the chromaticity coordinates of GdTaO4: xDy3+ have been correspondingly calculated. The results indicate that GdTaO4: Dy3+ would be a novel yellow emitting phosphor applied in light emitting diodes (LEDs), plasma display panels (PDPs) and mercury-free fluorescent tubes. PMID:27451754

  2. 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.

  3. 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

  4. Optical properties of Dy3+ ion in PbF2 laser crystal

    Science.gov (United States)

    Chen, G. Z.; Yin, J. G.; Zhang, L. H.; He, M. Z.; Ma, E.; Ning, K. J.; Zhang, P. X.; Liu, Y. C.; Hang, Y.

    2013-11-01

    High-quality Dy:PbF2 crystal is grown by the Bridgman method in a nonvacuum atmosphere. By measuring the area under absorption bands, the experimental oscillator strengths are determined. The Judd-Ofelt (JO) intensity parameters Ωλ (λ = 2, 4, 6) are evaluated by the least-squares fit method. These phenomenological parameters are used to predict radiative transition probabilities, radiative lifetime and branching ratios for various excited levels of the Dy3+:PbF2 crystal. Photoluminescence spectra and lifetime of 6H13/2 levels of the Dy3+ ions have been measured. The laser transitions with most potential are identified and the utility of the PbF2 crystal as laser active material is discussed.

  5. Magnetic separation of Dy(III) ions from homogeneous aqueous solutions

    International Nuclear Information System (INIS)

    The possibility to enrich paramagnetic dysprosium(III) ions in a magnetic field gradient is proved by means of interferometry, which may open the route for a magnetic separation of rare earth ions from aqueous solutions. The separation dynamics are studied for three different concentrations of DyCl3 and compared with those found recently in a sulphate solution of the 3d ion Mn(II). In view of the similar-sized hydration spheres for Dy(III) and Mn(II), the slower separation dynamics in DyCl3 is attributed to both a higher densification coefficient and the strong impact of Brownian motion due to the absence of ion-pair clusters

  6. Large rotating magnetocaloric effect in the orthorhombic DyMnO3 single crystal

    Science.gov (United States)

    Balli, M.; Mansouri, S.; Jandl, S.; Fournier, P.; Dimitrov, D. Z.

    2016-07-01

    A large magnetocaloric effect can be obtained around TN, Dy ̴8 K simply by spinning the orthorhombic DyMnO3 single crystal within the cb-plane in a constant magnetic field, instead of the standard magnetization-demagnetization process. Under 7 T, the maximum rotating entropy change (-ΔSR, cb) and the associated adiabatic temperature change (ΔTad, cb) are 16.3 J/kg K and 11 K, respectively. The corresponding refrigerant capacity is 440 J/kg, with no thermal and field hysteresis losses. Our findings show that the orthorhombic DyMnO3 could be used as a good refrigerant in more compact and efficient cryomagnetocaloric refrigerators.

  7. Thermal expansion anomaly and spontaneous magnetostriction of Dy2AlFe14Mn2 compound

    Institute of Scientific and Technical Information of China (English)

    WANG Hai-yun; ZHAO Miao; GAO Yan; ZHOU Yan; FU Bin; YAN Da-li

    2006-01-01

    The structure and magnetic properties of Dy2AlFe14Mn2 compound were investigated by X-ray diffractometry and magnetization measurements. Dy2AlFe14Mn2 compound has a hexagonal Th2Ni17-type structure. Zero thermal expansion and negative thermal expansion were found in Dy2AlFe14Mn2 compound in the temperature range from 184 to 264 K, and from 264 to 383 K, respectively, by X-ray dilatometry. The spontaneous magnetostrictive deformations from 104 to 400 K were calculated. The results show that the spontaneous volume magnetostrictive deformation increases firstly with increasing temperature, and then decreases with furtther increasing temperature.

  8. 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.

  9. 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.

  10. 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

    , 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......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...

  11. Preparation and tribological performance of electrodeposited Ni-TiB2-Dy2O3 composite coatings

    Institute of Scientific and Technical Information of China (English)

    LIU Xiaozhen; LI Xin; YU Aibing; HUANG Weijue

    2009-01-01

    TiB2 and Dy2O3 were used as codeposited particles in the preparation of Ni-TiB2-Dy2O3 composite coatings to improve its per-formance. Ni-TiB2-Dy2O3 composite coatings were prepared by electrodeposition method with a nickel cetyltrimethylanunonium bromide and hexadecylpyridinium bromide solution containing TiB2 and Dy2O3 particles. The content of codeposited TiB2 and Dy2O3 in the compos-ite coatings was controlled by adding TiB2 and Dy2O3 particles of different concentrations into the solution, respectively. The effects of TiB2 and Dy2O3 content on microhardness, wear mass loss and friction coefficients of composite coatings were investigated. The composite coat-ings were characterized by X-ray diffraction (XRD), inductively coupled plasma-atomic emission spectrometer (ICP-AES) and scanning electron microscopy (SEM) techniques. Ni-TiB2-Dy2O3 composite coatings showed higher microhardness, lower wear mass loss and friction coefficient compared with those of the pure Ni coating and Ni-TiB2 composite coatings. The wear mass loss of Ni-TiB2-Dy2O3 composite coatings was 9 and 1.57 times lower than that of the pure Ni coating and Ni-TiB2 composite coatings, respectively. The friction coefficient of pure Ni coating, Ni-TiB2 and Ni-TiB2-Dy2O3 composite coatings were 0.723, 0.815 and 0.619, respectively. Ni-TiB2-Dy2O3 composite coat-ings displayed the least friction coefficient among the three coatings. DY2O3 particles in composite coatings might serve as a solid lubricant between contact surfaces to decrease the friction coefficient and abate the wear of the composite coatings. The loading-bearing capacity and the wear-reducing effect of the Dy2O3 particles were closely related to the content of Dy2O3 particles in the composite coatings.

  12. Preparation of 166 Dy/166 Ho-Macro aggregates as an In vivo generator system for the treatment of arthrophaties

    International Nuclear Information System (INIS)

    The present work reports the obtention of macro aggregates of hydroxides of Dysprosium-166/Holmium-166 (166 Dy/166 Ho-MH), as a generator system in vivo to be used in the treatment of arthritis rheumatoid. The 166 Dy was obtained by neutron irradiation of 166 DyO3 (enriched to 98.45%) by 20 h in the TRIGA Mark III Reactor and 50 h of decay, to the oxide of 166 Dy/166 Ho formed, it was added HCl 0.12 N to obtain a final volume of 3.5 ml of solution of 166 Dy/166 Ho chloride. The solution of 166DyCl3 solution was obtained with an activity of 3.502 mCi (129 MBq), appropriate for the preparation of the radiopharmaceutical 166 Dy/166 Ho-MH. The separation of the 166 Dy from the 166 Ho, was carried out by chromatography in an cation exchange column, gaining an appropriate separation, obtaining a 166 Dy with a radionuclide purity greater than 90%. The 166 Dy/166 Ho-MH were prepared by addition to the solution of 166 DyCI3 NaOH 0.5 N low ultrasonic bath with later centrifugation, decanted and resuspension in saline solution, obtaining a radiopharmaceutical with a generator system 166 Dy/ 166 Ho with particles of size average of 3 μm, in form of 166 Dy / 166 Ho-MH. Under these conditions, it was obtained a radiochemical yield greater than 99%. The microscopic analysis and of filtration showed that the formulation doesn't present particles smaller than to 1 μm, neither greater to 50 μm, which will allow, the quick phagocytosis for the synoviocytes of the synovial membrane, and by consequence, an homogeneous distribution of the radiation dose could exist. The sedimentation velocity for the formulated suspension is of 0.04 cm/min that it will allow the administration of homogeneous activities of the radiopharmaceutical, to the no deposit in the injection devices. The studies of stability in vitro indicate us that inside the articulation, the particles won't probably reduce its size neither their radiochemical purity, for that the flight extra articular will be smaller that

  13. 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.

  14. Dy{sup 3+}-doped germanate glasses for waveguide-typed irradiation light sources

    Energy Technology Data Exchange (ETDEWEB)

    Li, H.Y.; Shen, L.F. [School of Textile and Material Engineering, Dalian Polytechnic University, Dalian 116034 (China); Department of Electronic Engineering and State Key Laboratory of Millimeter Waves, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong (China); Pun, E.Y.B. [Department of Electronic Engineering and State Key Laboratory of Millimeter Waves, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong (China); Lin, H., E-mail: lhai8686@yahoo.com [School of Textile and Material Engineering, Dalian Polytechnic University, Dalian 116034 (China); Department of Electronic Engineering and State Key Laboratory of Millimeter Waves, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong (China)

    2015-10-15

    Intense orange-yellow luminescence was achieved in trivalent dysprosium ion (Dy{sup 3+}) doped waveguide-adaptive sodium magnesium aluminium germanate (NMAG) glasses under ultraviolet (UV) radiation. The dominant 482.5 nm (blue) and 574.5 nm (yellow) peaks correspond to {sup 4}F{sub 9/2} → {sup 6}H{sub 15/2} and {sup 4}F{sub 9/2} → {sup 6}H{sub 13/2} transitions, respectively. The internal quantum efficiency for the {sup 4}F{sub 9/2} level of Dy{sup 3+} and the total external quantum yield for the four visible emissions were calculated to be 70.88% and 8.90%, respectively. Slab and channel waveguides were attempted by K{sup +}-Na{sup +} ion-exchange processes and the effective diffusion coefficient D{sub e} was derived to be 0.085 μm{sup 2}/min, indicating that thermal ion exchange was feasible to fabricate Dy{sup 3+}-doped NMAG glasses waveguide. The efficient visible emissions in Dy{sup 3+}-doped NMAG glasses demonstrate the potential in developing waveguide-typed irradiation light sources for minimally invasive photodynamic therapy. - Highlights: • Dy{sup 3+}-doped germanate glass was confirmed suitable for K{sup +}-Na{sup +} ion exchange for waveguide devices. • Orange-yellow luminescence dominated by {sup 4}F{sub 9/2} → {sup 6}H{sub 13/2} yellow emission was recorded. • High quantum efficiency of 70.88% was identified for {sup 4}F{sub 9/2} level of Dy{sup 3+} in germanate glasses. • Total quantum yield of four emissions in visible spectral region was derived to be 8.90%.

  15. Improved alumina scale adhesion of electron beam physical vapor deposited Dy/Hf-doped β-NiAl coatings

    Energy Technology Data Exchange (ETDEWEB)

    Li, Dongqing; Guo, Hongbo, E-mail: Guo.hongbo@buaa.edu.cn; Peng, Hui; Gong, Shengkai; Xu, Huibin

    2013-10-15

    The cyclic oxidation behavior of Dy/Hf-doped β-NiAl coatings produced by electron beam physical vapor deposition (EB-PVD) was investigated. For the undoped NiAl coating, numerous voids were formed at the alumina scale/coating interface and large rumpling developed in the scale, leading to premature oxide spallation. The addition of Dy and Hf both improved scale adhesion and the alumina scale grown on the NiAl-Hf coating showed better adhesion than that on the NiAl-Dy coating, although the suppressing effect on interfacial void formation and the scale rumpling resistance were stronger in the NiAl-Dy coating. It is proposed that the segregation of Dy and Hf ions at the scale/coating interfaces not only prevent interfacial sulfur segregation but also may directly enhance interfacial adhesion by participating in bonding across the interfaces, and this strengthening effect is relatively stronger for Hf ionic segregation.

  16. Improved alumina scale adhesion of electron beam physical vapor deposited Dy/Hf-doped β-NiAl coatings

    Science.gov (United States)

    Li, Dongqing; Guo, Hongbo; Peng, Hui; Gong, Shengkai; Xu, Huibin

    2013-10-01

    The cyclic oxidation behavior of Dy/Hf-doped β-NiAl coatings produced by electron beam physical vapor deposition (EB-PVD) was investigated. For the undoped NiAl coating, numerous voids were formed at the alumina scale/coating interface and large rumpling developed in the scale, leading to premature oxide spallation. The addition of Dy and Hf both improved scale adhesion and the alumina scale grown on the NiAl-Hf coating showed better adhesion than that on the NiAl-Dy coating, although the suppressing effect on interfacial void formation and the scale rumpling resistance were stronger in the NiAl-Dy coating. It is proposed that the segregation of Dy and Hf ions at the scale/coating interfaces not only prevent interfacial sulfur segregation but also may directly enhance interfacial adhesion by participating in bonding across the interfaces, and this strengthening effect is relatively stronger for Hf ionic segregation.

  17. Investigation on photoluminescence properties and defect chemistry of GdAlO3:Dy3+ Ba2+ phosphors

    Science.gov (United States)

    Selvalakshmi, Thangaraj; Sellaiyan, Selvakumar; Uedono, Akira; Semba, Takaaki; Bose, Arumugam Chandra

    2016-08-01

    GdAlO3:Dy3+ Ba2+ phosphors are synthesized by citrate-based sol-gel method. Photoluminescence and positron annihilation studies are used to investigate the emission and defect chemistry of the phosphors respectively. The strong yellow (Dy3+) emission properties of phosphors are discussed for various concentrations of Dy3+ ions. Upon the addition of Ba2+ ion, an enhancement in emission intensity is observed due to the lattice distortions around Dy3+ ion. The positron studies indicate the presence of defects at crystallite boundaries, vacancy clusters and large voids in the materials. The influence of Ba2+ ion on the photoluminescence and lattice distortion around Dy3+ is also explored.

  18. Evaluating the use of DyKnow in multi-UAV traffic monitoring applications

    OpenAIRE

    Persson, Tommy

    2009-01-01

    This Master’s thesis describes an evaluation of the stream-based knowledge pro-cessing middleware framework DyKnow in multi-UAV traffic monitoring applica-tions performed at Saab Aerosystems. The purpose of DyKnow is “to providegeneric and well-structured software support for the processes involved in gen-erating state, object, and event abstractions about the environments of complexsystems." It does this by providing the concepts of streams, sources, computa-tional units (CUs), entity frames...

  19. Thickness Dependence of Magnetic Properties in DyFeCo Films

    Institute of Scientific and Technical Information of China (English)

    Xiong Rui; Liu Hai-lin; Mei Xue-fei; Li Zuo-yi; Yang Xiao-fei; Shi Jing

    2004-01-01

    Films of amorphous DyFeCo were deposited on glass substrates using RF sputtering deposition system. The thickness dependence of the coercivity of DyFeCo films prepared under the same sputtering conditions was investigated. It is found that the composition is nearly thickness independent, while the coercivity is shown to increase with the film thickness increasing at the beginning, then above a certain thickness decrease with the thickness increasing. The thickness dependence of the coercivity is believed to be due to microstructure-induced variations in the short-range order during the film growth.

  20. Labeling of biotin with 166Dy/166Ho as a stable in vivo generator system

    International Nuclear Information System (INIS)

    Biotin (cis-tetrahydro-2-oxothieno[3,4-d]imidazoline-4-valeric acid) is a 244 Da vitamin found in low concentration in blood and tissue (vitamin H). The aim of this work was to synthesize 166Dy/166Ho-DTPA-bisBiotin to evaluate its potential as a new radiopharmaceutical for targeted radiotherapy. Dysprosium-166/ holmium-166 chloride was obtained by neutron irradiation of 20 mg of enriched Dy2O3 (164Dy, 99 %, from Oak Ridge NL) in a Triga Mark III reactor at a flux in the central thimble of 3.1013 n. cm-2 s-1 for 20 h. Following irradiation, the target was allowed to decay for 2 days, then 100 μL of 12 N chloride acid were added and stirred for 1 min. To this solution was added 500 μL of injectable water and the whole was also stirred for 2 min. The average radioactive concentration was 332 MBq/ml. The biotin used in this investigation was covalently conjugated to diethylenetriamine pentaacetic acid (DTPA) through the use of the cyclic anhydride and lysine conjugate to biotin (biocytin) to produce DTPA-α,ω-bis(biocytin amide)(DTPA-bisBiotin). Sterile and apyrogenic V-vial was prepared to contain 2.0 mg (1.9 x 10-3 mmol) of the DTPA-bisbiotin compound in 1.0 ml of 0.05 M bicarbonate buffer (pH 8.0) and then 20 μL of 166Dy2Cl3 solution were added to the preparation. Thin Layer Chromatography aluminum cellulose sheets were utilised as the stationary phase and a ternary mixture of methanol:water:ammonium hydroxide (20:40:2) as the mobile phase. 166Dy/166Ho-DTPA-bisBiotin travelled with the solvent front Rf 0.9-1.0 and the Dy+3/Ho+3 species remained at the origin (Rf = 0). The biological integrity of labelled biotin was achieved evaluating its avidity for avidin in an agarose column. Stability studies against dilution were carried out by diluting the radiocomplex solution with saline and with human serum at 310 K. After 10 min and 24 h the radiochemical purity of each 166Dy/166Ho complex solution was determined by TLC. The complex 166Dy/166Ho-DTPA-bisBiotin was

  1. Magnetocaloric properties of rare-earth substituted DyCrO3

    Science.gov (United States)

    McDannald, A.; Jain, M.

    2015-07-01

    Recently, there has been a focus on the need for efficient refrigeration technology without the use of expensive or harmful working fluids, especially at temperatures below 30 K. Solid state refrigeration, based on the magnetocaloric effect, provides a possible solution to this problem. The rare-earth chromites (RCrO3), especially DyCrO3, with its large magnetic moment dysprosium ion, are potential candidates for such an application. The Dy3+ ordering transition at low temperatures (cooling power of 237 J/kg at 40 kOe and 5 K) indicates that this material system is well suited for low temperature (<30 K) solid state refrigeration applications.

  2. Evol and ProDy for bridging protein sequence evolution and structural dynamics

    Science.gov (United States)

    Mao, Wenzhi; Liu, Ying; Chennubhotla, Chakra; Lezon, Timothy R.; Bahar, Ivet

    2014-01-01

    Correlations between sequence evolution and structural dynamics are of utmost importance in understanding the molecular mechanisms of function and their evolution. We have integrated Evol, a new package for fast and efficient comparative analysis of evolutionary patterns and conformational dynamics, into ProDy, a computational toolbox designed for inferring protein dynamics from experimental and theoretical data. Using information-theoretic approaches, Evol coanalyzes conservation and coevolution profiles extracted from multiple sequence alignments of protein families with their inferred dynamics. Availability and implementation: ProDy and Evol are open-source and freely available under MIT License from http://prody.csb.pitt.edu/. Contact: bahar@pitt.edu PMID:24849577

  3. High-pressure synthesis of a La orthosilicate and Nd, Gd, and Dy disilicates

    Science.gov (United States)

    Liu, Xiaoyang; Fleet, Michael E.

    2002-11-01

    Several rare-earth silicates have been synthesized at 10 GPa and 1600-1700 °C: a La orthosilicate (La4Si3O12) with a defect Ba3(PO4)2-type, a new structure type (K) for Nd and Gd disilicates (Nd2Si2O7 and Gd2Si2O7) with a diorthosilicate structure, and a new structure type (L) for Dy disilicate (Dy2Si2O7) with a structure containing linear triple tetrahedral groups [Si3O10], but having one in six atoms distributed with 50% occupancy over two tetrahedral positions.

  4. Magnetic and Transport Properties of Ferromagnetic Semiconductor GaDyN Thin Film

    Institute of Scientific and Technical Information of China (English)

    LI Xi-Jun; ZHOU YI-Kai; KIM M.; KIMURA S.; TERAGUCHI N.; EMURA S.; HASEGAWA S.; ASAHI H.

    2005-01-01

    @@ Magnetic properties and temperature dependence of electrical transport properties of rare-earth-metal Dy-doped GaN thin film are experimentally studied with a superconducting quantum interference device magnetometer and van der Pauw method. It was found that this thin nitride film has both semiconductor properties and ferromagnetism from 10K to room temperature. The dopant-band (conducting band due to doping) electron conduction dominates the transport properties of this film at low temperatures. These results indicate that Dy-doped GaN is an n-type ferromagnetic semiconductor at room temperature.

  5. 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...

  6. Tb-Dy-Fe Single Crystal and Magnetostrictive Actuator Using These Materials

    Institute of Scientific and Technical Information of China (English)

    2001-01-01

    Magnetostrictive actuators normally use twin-crystal magnetostrictive materials as driving unit. Because the crystal and twin-crystal plane hinder the movement of the domain wall, its displacement output of low magnetic strength is rather small. Using Tb-Dy-Fe single crystal technique can effectively solve the problems brought by pollution and twin crystals, and produce high-quality Tb-Dy-Fe single crystal materials. The paper will introduce the technique of using these materials to produce magnetostrictive actuators that possess high sensitivity and resolution and use pulse feeding.

  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. On the exponential Diophantine equation x3+1=Dy2%关于指数Diophantine方程x3+1=Dy2

    Institute of Scientific and Technical Information of China (English)

    万飞; 杜先存

    2012-01-01

    设D是6k+1型的奇素数,运用Pell方程px2-3y2=1的最小解、同余式、平方剩余等初等方法给出了:当D=12t2+1(t是奇数)时,Diophantine方程x3+1 =Dy2无正整数解的一个充分条件.

  9. Development of FRET-Based Assays in the Far-Red Using CdTe Quantum Dots

    Directory of Open Access Journals (Sweden)

    E. Z. Chong

    2007-01-01

    Full Text Available Colloidal quantum dots (QDs are now commercially available in a biofunctionalized form, and Förster resonance energy transfer (FRET between bioconjugated dots and fluorophores within the visible range has been observed. We are particularly interested in the far-red region, as from a biological perspective there are benefits in pushing to ∼700 nm to minimize optical absorption (ABS within tissue and to avoid cell autofluorescence. We report on FRET between streptavidin- (STV- conjugated CdTe quantum dots, Qdot705-STV, with biotinylated DY731-Bio fluorophores in a donor-acceptor assay. We also highlight the changes in DY731-Bio absorptivity during the streptavidin-biotin binding process which can be attributed to the structural reorientation. For fluorescence beyond 700 nm, different alloy compositions are required for the QD core and these changes directly affect the fluorescence decay dynamics producing a marked biexponential decay with a long-lifetime component in excess of 100 nanoseconds. We compare the influence of the two QD relaxation routes upon FRET dynamics in the presence of DY731-Bio.

  10. Coherent phonons in pyrochlore titanates A2Ti2O7 (A= Dy, Gd, Tb): A phase transition in Dy2Ti2O7 at 110 K

    Science.gov (United States)

    Kamaraju, N.; Kumar, Sunil; Saha, Surajit; Singh, Surjeet; Suryanarayanan, R.; Revcolevschi, A.; Sood, A. K.

    2011-04-01

    We study the generation of coherent optical phonons in spin-frustrated pyrochlore single crystals Dy2Ti2O7, Gd2Ti2O7, and Tb2Ti2O7 using femtosecond laser pulses (65 fs, 1.57 eV) in degenerate time-resolved transmission experiments as a function of temperature from 4 to 296 K. At 4 K, two coherent phonons are observed at ~5.3 THz (5.0 THz) and ~9.3 THz (9.4 THz) for Dy2Ti2O7 (Gd2Ti2O7), whereas three coherent phonons are generated at ~5.0, 8.6, and 9.7 THz for Tb2Ti2O7. In the case of spin-ice Dy2Ti2O7, a clear discontinuity is observed in the linewidths of both the coherent phonons as well as in the phase of lower-energy coherent phonon mode, indicating a subtle structural change at 110 K. Another important observation is a phase difference of π between the modes in all the samples, thus suggesting that the driving forces behind the generation of these modes could be different in nature, unlike a purely impulsive or displacive mechanism.

  11. Occurrence of magnetoelectric effect correlated to the Dy order in Dy{sub 2}NiMnO{sub 6} double perovskite

    Energy Technology Data Exchange (ETDEWEB)

    Masud, Md G.; Dey, K.; Ghosh, A.; Majumdar, S.; Giri, S., E-mail: sspsg2@iacs.res.in [Department of Solid State Physics, Indian Association for the Cultivation of Science, 2A & B Raja S. C. Mullick Road, Kolkata 700 032 (India)

    2015-08-14

    Magnetic, dielectric, and ac conductivity as well as room temperature structural and Raman studies are performed on double perovskite Dy{sub 2}NiMnO{sub 6}. The crystal structure of the compound adopts monoclinic P2{sub 1}/n space group, where alternate Mn and Ni distorted octahedral are arranged in anti-phase a{sup −} a{sup −} b{sup +} order in Glazer notation. Magnetization studies show two magnetic transitions around 100 K and 20 K which are related to the ordering of transition and rare earth cations moment, respectively. Temperature dependent dielectric permittivity shows Havriliak-Negami type thermally activated dielectric relaxation. The ac conductivity at different temperature is found to follow Jonscher power law behavior. Time-temperature scaling of the conductivity spectra reveals that the charge transport dynamics is independent of temperature. Intriguingly, an anomaly in the dielectric constant is observed close to the order of Dy moment which indicates intrinsic magnetoelectric coupling. The hybridization between Dy and Ni/Mn is suggested to be correlated with the magnetoelectric coupling.

  12. Bränditutkimus Etelä-Pohjanmaan Osuuspankille

    OpenAIRE

    Jämbäck, Anna-Leena

    2013-01-01

    Opinnäytetyön tarkoituksena oli tutkia Etelä-Pohjanmaan Osuuspankin brändiä sen 20–30-vuotiaiden asiakkaiden näkökulmasta. Ensimmäisenä tavoitteena oli perehtyä brändeihin. Opinnäytetyön toisena tavoitteena oli bränditutkimuksen toteuttaminen EPOP:n 20–30-vuotiaille asiakkaille, jotta saataisiin selville millaiseksi se koetaan eri osa-alueilla sekä kokonaisuutena nuorten aikuisten keskuudessa. Kolmantena tavoitteena oli pohtia tutkimustulosten perusteella uusia ideoita organisaation markkinoi...

  13. Inhibition of hydrogen oxidation by HBr and Br2

    DEFF Research Database (Denmark)

    Dixon-Lewis, Graham; Marshall, Paul; Ruscic, Branko;

    2012-01-01

    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......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...

  14. Selected Femme / Homme - brändin lanseeraus Suomen markkinoille

    OpenAIRE

    Saarinen, Saila

    2009-01-01

    Tanskalaisomistuksessa oleva, kansainvälinen muotitalo Bestseller A/S lanseerasi uuden Selec-ted Femme / Homme - brändin Suomen markkinoille lokakuussa 2008. Tuotemerkin vali-koimiin kuuluu naisten ja miesten vaatteet, asusteet sekä jalkineet. Mallistoista on tuotteita arkeen ja juhlaan. Niissä yhdistyvät hyvän hinta laatu-suhteen lisäksi trendikkyys. Opinnäytetyössä tarkasteltiin brändin ensimmäisen unisex -myymälän lanseerausta kuluttajil-le. Työn tarkoitus oli tutkia uuden brändin ide...

  15. On some questions of Fisk and Br\\"and\\'en

    CERN Document Server

    Yoshida, Rintaro

    2010-01-01

    P. Br\\"and\\'en recently proved a conjecture due to S. Fisk, R. P. Stanley, P. R. W. McNamara and B. E. Sagan. In addition, P. Br\\"and\\'en gave a partial answer to a question posed by S. Fisk regarding the distribution of zeros of polynomials under the action of certain non-linear operators. In this paper, we give an extension to a result of P. Br\\"and\\'en, and we also answer a question posed by S. Fisk.

  16. 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.

  17. Pulsed laser deposited GeTe-rich GeTe-Sb2Te3 thin films

    Science.gov (United States)

    Bouška, M.; Pechev, S.; Simon, Q.; Boidin, R.; Nazabal, V.; Gutwirth, J.; Baudet, E.; Němec, P.

    2016-05-01

    Pulsed laser deposition technique was used for the fabrication of Ge-Te rich GeTe-Sb2Te3 (Ge6Sb2Te9, Ge8Sb2Te11, Ge10Sb2Te13, and Ge12Sb2Te15) amorphous thin films. To evaluate the influence of GeTe content in the deposited films on physico-chemical properties of the GST materials, scanning electron microscopy with energy-dispersive X-ray analysis, X-ray diffraction and reflectometry, atomic force microscopy, Raman scattering spectroscopy, optical reflectivity, and sheet resistance temperature dependences as well as variable angle spectroscopic ellipsometry measurements were used to characterize as-deposited (amorphous) and annealed (crystalline) layers. Upon crystallization, optical functions and electrical resistance of the films change drastically, leading to large optical and electrical contrast between amorphous and crystalline phases. Large changes of optical/electrical properties are accompanied by the variations of thickness, density, and roughness of the films due to crystallization. Reflectivity contrast as high as ~0.21 at 405 nm was calculated for Ge8Sb2Te11, Ge10Sb2Te13, and Ge12Sb2Te15 layers.

  18. Electrical properties of Hg1-xCdxTe by different etching techniques

    Science.gov (United States)

    Chen, X. T.; Qiao, H.; Liu, X. Y.; Yang, K. J.

    2015-11-01

    Effects on the electrical properties of HgCdTe photoconductive devices etched by inductively coupled plasma (ICP) based on CH4-Ar mixture, ion beam milling (IBM) and bromine-hydrogen bromide solution (Br2/HBr) have been investigated. Magnetic-field-dependent Hall measurement and optoelectronic performance measurement at liquid nitrogen temperature were performed. Mobility spectrum analysis (MSA) and multicarrier fitting (MCF) were applied to evaluate the carrier characteristics. Sample etched by ICP indicated a higher mobility and the carrier scattering mechanism was dominated by polar optical phonon (POP) which could lead to superior detector performance accordingly. Meanwhile, sample etched by IBM was found to have large amount of electron concentration and sample etched by Br2/HBr showed a very low mobility. The dominant mechanism of Br2/HBr etched sample was ionized impurity scattering for the carriers which meant inferior resultant detector performance.

  19. BR2: Some aspects of structural mechanics

    International Nuclear Information System (INIS)

    This article discusses some of the important aspects of structural mechanics of BR2, namely: the follow-up of the beryllium matrix and of the reactor vessel and the seismic qualification. According the licence, a follow up program for the beryllium matrix is mandatory. This inspection is necessary because of the swelling of beryllium during irradiation. Due to this swelling, the individual beryllium blocks make contact between each other. This results in mechanical stresses and, because beryllium is a brittle material, cracks. At regular intervals inspection are made to evaluate the evolution of the swelling and the cracks. The maximum allowed neutron fluence is 6.4 1022 fast neutrons (energy more than 1 MeV) per cm2 . After this time the matrix has to be replaced. This has been done already twice. During the replacement an inspection of the reactor pressure vessel must be made. Last inspection was performed in 1996, using ultrasonic and eddy current inspections. On this occasion a fracture mechanics calculation was made and the minimum allowed fracture toughness of material was determined. Since very little information on irradiated aluminium 5052-O is available, a number of samples were cut out of a second wall around the vessel. This aluminium had received nearly the fluence. Out of the samples test pieces (tensile and charpy) were made. A number of them were tested immediately, while the other was loaded in the reactor for accelerated irradiation. In this way a material follow up program was started. This program still continues. During the period safety reassessment the authorities requested a seismic qualification. It was decided to make a full dynamic calculation, with input a 0.1g zero period peak ground acceleration and a regulatory guide 1.60 spectrum. The installation can withstand this earthquake, considered as a safe shutdown earthquake. A few structural reinforcements were necessary. The main ones were the primary piping outside the containment

  20. 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…

  1. Thermoluminescence studies of thermally treated CaB{sub 4}O{sub 7}:Dy

    Energy Technology Data Exchange (ETDEWEB)

    Tekin, E., E-mail: ekdalelcin@hotmail.co [Ege University, Institute of Nuclear Sciences, 35100 Izmir (Turkey); Ege, A.; Karali, T. [Ege University, Institute of Nuclear Sciences, 35100 Izmir (Turkey); Townsend, P.D. [University of Sussex, Brighton BN1 9QH, East Sussex (United Kingdom); Prokic, M. [Institute of Nuclear Sciences, Vinca, P. O. Box 522, 11001 Belgrade (Serbia)

    2010-08-15

    Borate based thermoluminescence dosimeters (TLD) show high sensitivity and good TL characteristics. One of the promising material amongst the dosimeters is Dy doped CaB{sub 4}O{sub 7}. Spectrally resolved thermoluminescence of Dy doped CaB{sub 4}O{sub 7} shows three glow peaks at about 50 {sup o}C, 240 {sup o}C and 380 {sup o}C, the intensity of the 240 {sup o}C glow peak being the maximum. All TL experiments were conducted on a high sensitivity TL spectrometer at Sussex University with a heating rate of 50 {sup o}C min{sup -1}. Two main emissions associated with the Dy dopant are observed at {approx}480 and 580 nm. The samples were subjected to a series of treatments including excitation by X-rays and UV laser radiation. As part of the present research CaB{sub 4}O{sub 7}:Dy materials were subjected to two different heat treatments; quenching and slow cooling in order to investigate the changes in TL characteristics.

  2. 500 Days of SN 2013dy: spectra and photometry from the ultraviolet to the infrared

    CERN Document Server

    Pan, Y -C; Challis, P; Clubb, K I; Filippenko, A V; Folatelli, G; Fox, O D; Graham, M L; Hillebrandt, W; Kirshner, R P; Kromer, M; Lee, W H; Pakmor, R; Patat, F; Phillips, M M; Pignata, G; Roepke, F; Seitenzahl, I; Silverman, J M; Simon, J D; Sternberg, A; Stritzinger, M D; Taubenberger, S; Vinko, J; Wheeler, J C; Zheng, W

    2015-01-01

    SN 2013dy is a relatively normal SN Ia for which we have compiled an extraordinary dataset spanning from 0.1 to ~ 500 days after explosion. We present 10 epochs of ultraviolet (UV) through near-infrared (NIR) spectra with HST/STIS, 48 epochs of optical spectra (15 of them having high resolution), and more than 500 photometric observations in the BVrRiIZYJH bands. SN 2013dy has a somewhat broad and slowly declining light curve (delta m(B) = 0.92 mag), shallow Si II 6355 absorption, and a low velocity gradient. We detect strong C II in our earliest spectra, probing unburned progenitor material in the outermost layers of the SN ejecta, but this feature fades within a few days. The UV continuum of SN 2013dy, which is strongly affected by the metal abundance of the progenitor star, indicates that SN 2013dy had a relatively high-metallicity progenitor. Examining the largest single set of high-resolution spectra for a SN Ia, we find no evidence of variable absorption from circumstellar material. Combining our UV spe...

  3. 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.

  4. Dy-IP characterization and its application for experimental neutron radiography tests under realistic conditions

    Science.gov (United States)

    Tamaki, Masayoshi; Iida, Kazuhiro; Mori, Noriaki; Lehmann, Eberhard H.; Vontobel, Peter; Estermann, Mirko

    2005-04-01

    Imaging plates containing Dy for neutron radiography have been designed, fabricated and tested experimentally. Using the imaging plates combined with the developed NR system and the honeycomb collimator, quantitative neutron radiograph, which is free from scattered neutron and γ-ray, has been obtained. Application has been conducted for the post-irradiation examination for the nuclear fuel pin.

  5. Study on oxide resistance of long persistent phosphor SrAl2O4: Eu, Dy

    Institute of Scientific and Technical Information of China (English)

    2005-01-01

    The heat-treated temperature and preservative time influence on oxide resistance of SrAl2O4 :Eu2+ ,Dy3+ in high temperature atmosphere were studied in this paper. The result showed that oxide resistance was improved obviously by phosphor particles coated SiO2. The reason for the coating to craze above 900℃ was also analyzed.

  6. Magnetic properties and anisotropy of orthorhombic DyMnO{sub 3} single crystal

    Energy Technology Data Exchange (ETDEWEB)

    Pękała, M. [Department of Chemistry, University of Warsaw, Al. Zwirki i Wigury 101, PL-02-089 Warsaw (Poland); Wolff-Fabris, F., E-mail: f.wolff-fabris@xfel.eu [Dresden High Magnetic Field Laboratory (HLD), Helmholtz Zentrum Dresden-Rossendorf, 01314 Dresden (Germany); MPA-NHMFL, Los Alamos National Laboratory, Los Alamos, NM 87545 (United States); Fagnard, J-F.; Vanderbemden, Ph. [SUPRATECS, Department of Electrical Engineering and Computer Science B28, University of Liege, Sart Tilman, B-4000 Liege (Belgium); Mucha, J. [W. Trzebiatowski Institute for Low Temperature and Structure Research, Polish Academy of Science, PO Box 1410, 50-950 Wrocław 2 (Poland); Gospodinov, M.M.; Lovchinov, V. [Institute of Solid State Physics, Bulgarian Academy of Sciences, 72 Tzarigradsko Chaussee blvd, 1784 Sofia (Bulgaria); Ausloos, M. [SUPRATECS, Department of Physics B5a, Sart Tilman, B-4000 Liege (Belgium)

    2013-06-15

    An orthorhombic DyMnO{sub 3} single crystal has been studied in magnetic fields up to 14 T and between 3 K and room temperature. The field dependent ordering temperature of Dy moments is deduced. The paramagnetic Curie Weiss behavior is related mainly to the Dy{sup 3+}sublattice whereas the Mn sublattice contribution plays a secondary role. DC magnetization measurements show marked anisotropic features, related to the anisotropic structure of a cubic system stretched along a body diagonal, with a magnetic easy axis parallel to the crystallographic b axis. A temperature and field dependent spin flop transition is observed below 9 K, when relatively weak magnetocrystalline anisotropy is overcome by magnetic fields up to 1.6 T. - Highlights: ► An orthorhombic DyMnO{sub 3} single crystal has been studied in high magnetic fields and low temperatures. ► It is found that the easy and hard magnetic axes are oriented along the b and c axes, respectively. ► A temperature and field dependent spin flop transition is observed below 9 K, when relatively weak magnetocrystalline anisotropy is overcome by magnetic fields up to 1.6 T. ► The antiferromagnetic structure is stabilized along the b axis by relatively weak magnetocrystalline anisotropy.

  7. Thermal composition of DyF-, HoF-, and TmF-based gases

    Science.gov (United States)

    Kaledin, Leonid A.; Holbrook, Robert T.; Kunc, Joseph A.

    1998-04-01

    The partition functions are calculated for gases consisting of Ln and F atoms, Ln+ ions, LnF and F2 molecules, and LnF+ molecular ions (Ln≡Dy, Ho, Tm) and are subsequently used in determining the local thermal equilibrium compositions of such gases.

  8. Thermoluminescence characterization of Dy(3+) -activated Mg₅ (BO₃ )₃ F low Z(eff) phosphor.

    Science.gov (United States)

    Wani, Javaid A; Dhoble, N S; Dhoble, S J

    2013-01-01

    Thermoluminescence characteristics of Dy(3+) -activated Mg₅ (BO₃ )₃ F low Z(eff) phosphor are described. The Mg₅ (BO₃ )₃ F phosphor doped with Dy(3+) as activator was prepared by the modified solid-state reaction. Formation of the compound was confirmed by use of X-ray powder diffraction. The X-ray powder diffraction pattern of the as-prepared compound shows a good match with the available JCPDS data. The γ-irradiated Mg₅ (BO₃ )₃ F:Dy(3+) phosphor shows a simple glow curve peaking at about 148°C indicating that only one type of trap is being activated within a particular temperature range. The kinetic parameters, including activation energy and frequency factor were determined using Chen's method. The activation energy and frequency factors were 0.75 eV and 4.508 × 10(9) /s respectively. The Z(eff) ofMg₅ (BO₃ )₃ F:Dy(3+) phosphor was 9.84. PMID:23055350

  9. DyP‑type peroxidases : a promising and versatile class of enzymes

    NARCIS (Netherlands)

    Colpa, Dana I.; Fraaije, Marco W.; Bloois, Edwin van

    2014-01-01

    DyP peroxidases comprise a novel superfamily of heme-containing peroxidases, which is unrelated to the superfamilies of plant and animal peroxidases. These enzymes have so far been identified in the genomes of fungi, bacteria, as well as archaea, although their physiological function is still unclea

  10. Preparation, structural and magnetic characterization of DyCrMnO 5

    Science.gov (United States)

    Martínez-Lope, M. J.; Retuerto, M.; García-Hernández, M.; Alonso, J. A.

    2009-03-01

    The title compound has been first synthesized by a citrate technique followed by thermal treatments under moderate oxygen pressure conditions, and characterized by X-ray and neutron powder diffraction (NPD) and magnetization measurements. The crystal structure of DyCrMnO 5 has been refined from NPD data in the space group Pbam; a=7.2617(6) Å, b=8.5161(6) Å, and c=5.7126(5) Å at 295 K. This oxide is isostructural with RMn 2O 5 oxides ( R=rare earths) and it contains infinite chains of (Cr, Mn) 4+O 6 octahedra-sharing edges, linked together by (Mn, Cr) 3+O 5 pyramids and DyO 8 units. The high degree of antisite disordering exhibited by DyCrMnO 5 is noteworthy. The octahedral positions are occupied by roughly 50% of Mn and Cr cations, and the pyramidal groups contain two thirds of Mn and one third of Cr cations. We assume that Mn and Cr cations at the octahedral positions exhibit a tetravalent oxidation state, whereas the metals at the pyramidal positions are trivalent, in order to preserve the electroneutrality of this oxide. The susceptibility vs temperature curve of DyCrMnO 5 does not suggest the establishment of a long-range magnetic structure even at low temperatures; the NPD technique does not provide any signal of magnetic ordering, since the reflections do not show any magnetic contribution.

  11. On the binary helium star DY Centauri: chemical composition and evolutionary state

    Energy Technology Data Exchange (ETDEWEB)

    Pandey, Gajendra; Rao, N. Kameswara [Indian Institute of Astrophysics, Bangalore 560034 (India); Jeffery, C. Simon [Armagh Observatory, Collage Hill, Armagh BT61 9DG (United Kingdom); Lambert, David L., E-mail: pandey@iiap.res.in, E-mail: nkrao@iiap.res.in, E-mail: csj@arm.ac.uk, E-mail: dll@astro.as.utexas.edu [The W. J. McDonald Observatory and Department of Astronomy, University of Texas at Austin, Austin, TX 78712-1083 (United States)

    2014-10-01

    DY Cen has shown a steady fading of its visual light by about one magnitude in the last 40 yr, suggesting a secular increase in its effective temperature. We have conducted non-local thermodynamic equilibrium (LTE) and LTE abundance analyses to determine the star's effective temperature, surface gravity, and chemical composition using high-resolution spectra obtained over two decades. The derived stellar parameters for three epochs suggest that DY Cen has evolved at a constant luminosity and has become hotter by about 5000 K in 23 yr. We show that the derived abundances remain unchanged for the three epochs. The derived abundances of the key elements, including F and Ne, are as observed for the extreme helium stars resulting from a merger of a He white dwarf with a C-O white dwarf. Thus DY Cen by chemical composition appears to also be a product of a merger of two white dwarfs. This appearance seems to be at odds with the recent suggestion that DY Cen is a single-lined spectroscopic binary.

  12. Project DyAdd: Implicit Learning in Adult Dyslexia and ADHD

    Science.gov (United States)

    Laasonen, Marja; Väre, Jenni; Oksanen-Hennah, Henna; Leppämäki, Sami; Tani, Pekka; Harno, Hanna; Hokkanen, Laura; Pothos, Emmanuel; Cleeremans, Axel

    2014-01-01

    In this study of the project DyAdd, implicit learning was investigated through two paradigms in adults (18-55 years) with dyslexia (n?=?36) or with attention deficit/hyperactivity disorder (ADHD, n?=?22) and in controls (n?=?35). In the serial reaction time (SRT) task, there were no group differences in learning. However, those with ADHD exhibited…

  13. Gammaübergänge und Energieniveaus in Dy165

    DEFF Research Database (Denmark)

    Schult, O.; Maier, B.; Gruber, U.

    1964-01-01

    220 neutron capture Gamma rays of Dy 165 were measured with the Risø curved crystal spectrometer. The intense transitions permitted the construction of a level scheme for this oddN nucleus. The rotational bandsK=7/2+[633],K=1/2−[521] andK=5/2−[512] were precisely localized, including the spin 11/...

  14. Energieniveaus und Gamma-übergänge in Dy164

    DEFF Research Database (Denmark)

    Schult, O.; Gruber, U.; Maier, B.;

    1964-01-01

    The neutron capture Gamma ray spectrum of Dy 164 was measured with the curved crystal spectrometer at the DR-3 reactor at Risø. A level scheme was constructed from the energies (30 keV−1 MeV) and the intensities of the detected lines. The states obtained are: the groundstate rotational band with ...

  15. Giant rotating magnetocaloric effect induced by highly texturing in polycrystalline DyNiSi compound

    Science.gov (United States)

    Zhang, Hu; Li, Yawei; Liu, Enke; Ke, Yajiao; Jin, Jinling; Long, Yi; Shen, Baogen

    2015-07-01

    Large rotating magnetocaloric effect (MCE) has been observed in some single crystals due to strong magnetocrystalline anisotropy. By utilizing the rotating MCE, a new type of rotary magnetic refrigerator can be constructed, which could be more simplified and efficient than the conventional one. However, compared with polycrystalline materials, the high cost and complexity of preparation for single crystals hinder the development of this novel magnetic refrigeration technology. For the first time, here we observe giant rotating MCE in textured DyNiSi polycrystalline material, which is larger than those of most rotating magnetic refrigerants reported so far. This result suggests that DyNiSi compound could be attractive candidate of magnetic refrigerants for novel rotary magnetic refrigerator. By considering the influence of demagnetization effect on MCE, the origin of large rotating MCE in textured DyNiSi is attributed to the coexistence of strong magnetocrystalline anisotropy and highly preferred orientation. Our study on textured DyNiSi not only provides a new magnetic refrigerant with large rotating MCE for low temperature magnetic refrigeration, but also opens a new way to exploit magnetic refrigeration materials with large rotating MCE, which will be highly beneficial to the development of rotating magnetic refrigeration technology.

  16. Optical properties and local structure of Dy3+-doped chalcogenide and chalcohalide glasses

    Institute of Scientific and Technical Information of China (English)

    TANG Gao; YANG Zhiyong; LUO Lan; CHEN Wei

    2008-01-01

    Dy3+-doped Ge-Ga-Se chalcogenide glasses and GeSe2-Ga2Se3-CsI chalcohalide glasses were prepared. The absorption, emission properties, and local structure of the glasses were investigated. When excited at 808 nm diode laser, intense 1.32 and 1.55 μm near-infrared luminescence were observed with full width at half maximum (FWHM) of about 90 and 50 rim, respectively. The lifetime of the 1.32 μm emission varied due to changes in the local structure surrounding Dy3+ ions. The longest lifetime was over 2.5 ms, and the value was signifi-cantly higher than that in other Dy3+-doped glasses. Some other spectroscopic parameters were calculated by using Judd-Ofelt theory. Meanwhile, Ge-Ga-Se and GeSe2-Ga2Se3-CsI glasses showed good infrared transmittance. As a result, Dy3+-doped Ge-Ga-Se and GeSe2-Ga2Se3-CsI glasses were believed to be useful hosts for 1.3 μm optical fiber amplifier.

  17. Crystal fields of dilute Tb, Dy, or Er in Sc obtained by magnetization measurements

    DEFF Research Database (Denmark)

    Høg, J.; Touborg, P.

    1976-01-01

    Crystal-field parameters for dilute Sc-Tb, Sc-Dy, and Sc-Er alloys have been obtained by fitting theoretical expressions to the experimentally measured paramagnetic susceptibility. The initial susceptibility was measured and corrected for the effects of ordering at the lowest temperatures in the ...

  18. Selective electrodeposition of dysprosium in LiCl-KCl-GdCl3-DyCl3 melts at magnesium electrodes: Application to separation of nuclear wastes

    International Nuclear Information System (INIS)

    The electrochemical behaviour and extraction efficiency of DyCl3 and GdCl3 solutions were studied by cyclic voltammetry, square wave voltammetry and open-circuit chronopotentiometry in the eutectic LiCl-KCl at 773 K using inert and reactive electrodes, i.e. W and Mg, respectively. On W and Mg electrodes, Dy(III) ions are reduced to metallic dysprosium through two consecutive steps. The selective electrodepositing of dysprosium in a form of Mg-Dy alloys can be easier than that in a pure metallic form, without reduction of the extraction yield. Potentiostatic electrolysis experiments were performed to extract Dy from GdCl3 and DyCl3 mixtures at magnesium electrodes. XRD patterns of deposit indicated that Mg3Dy phase was formed. Scanning electron microscope (SEM) images with Energy dispersive X-ray Spectroscopy (EDS) showed the grain size was refined with a greater content of Dy in alloys

  19. Luminescent Properties of Green Phosphor Ca8Mg(SiO4)4Cl2:Eu2+, Dy3+ for LED Applications

    Institute of Scientific and Technical Information of China (English)

    2007-01-01

    The new phosphor calcium magnesium chlorosilicate, codoped with Eu2+ and Dy3+, was synthesized with the help of the high temperature solid state reaction in reducing atmosphere. The excitation and emission spectra were very similar to that of Ca8Mg(SiO4)4Cl2:Eu2+, and the Dy3+ concentration influenced the emission intensity of this phosphor. The intensity of Eu2+ and Dy3+ codoped CMSC was stronger than that of Eu2+ singly doped CMSC. The emission spectrum of the Dy3+ ion overlapped the absorption band of the Eu2+ ion, indicating that an energy transfer from Dy3+ to Eu2+ took place in CMSC:Eu2+, Dy3+ phosphor. The mechanism of the energy transfer from Dy3+ to Eu2+, in this phosphor, might be resonant energy transfer.

  20. Luminescence, Concentration Quenching and Thermal Stability of White Emitting Phosphor Ba2Ca(BO3)2:Dy3+

    Institute of Scientific and Technical Information of China (English)

    SONG Huiling; ZHOU Fen; CAO Heying; GUO Mingchao; ZHAO Jiawei; WANG Zhijun; LIU Haiyan; GAO Shaojie; LI Panlai

    2015-01-01

    A white emitting phosphor Ba2Ca(BO3)2:Dy3+ was synthesizedvia a high temperature solid state reaction at 1000℃ for 5 h. The luminescence, mole fraction quenching and thermal stability of Ba2Ca(BO3)2:Dy3+ were investi-gated. According to the phase composition analyzed by X-ray powder diffraction, there is no crystalline phase except Ba2Ca(BO3)2 in the sample. Ba2Ca(BO3)2:Dy3+ can produce white emission under 348 nm excitation. The emission in-tensities of Ba2Ca(BO3)2:Dy3+ are affected by Dy3+ concentration. The concentration quenching effect was analyzed, and the concentration quenching mechanism was verified as dipole-dipole interaction. The critical distance (Rc) obtained based on the crystal structure data is 2.911 nm. At 150℃, the emission intensity of Ba2Ca(BO3)2:Dy3+ is 68.0% of the initial value at room temperature. The activation energy for the thermal quenching calculated is 0.202 eV. Moreover, the CIE chromaticity coordinates of Ba2Ca(BO3)2:Dy3+ locate in the white region of (0.319, 0.356).

  1. A neutron diffraction and molecular dynamics investigation of the environment of Dy3+ ions in a fluoroberyllate glass

    International Nuclear Information System (INIS)

    A combined neutron diffraction and molecular dynamics study is reported of the Dy3+ ion environment in vitreous NaF--DyF3--BeF2, using a special version of the isotopic substitution procedure known as the null technique. To investigate the effects of both NaF and DyF3 on the basic beryllium fluoride glass network, complementary measurements and simulations have been performed for vitreous NaF--BeF2, with the same NaF:BeF2 ratio as the DyF3 containing glass, and also for pure vitreous BeF2. The neutron diffraction data indicate that for glasses simulated using pair potentials the BeF4 tetrahedra are much more distorted than those in the real materials and the mean Be--F--Be angle is too high. Both of these deficiencies in the simulations are attributed to the use of simple ionic potentials with no bond angle restoring forces. Experimentally, the distribution of Dy--F first neighbor distances is found to be narrow, having a root mean square deviation of 0.110±0.003 A about the mean value of 2.290±0.003 A. The Dy(F) coordination number is 7.3±0.2 which is slightly less than that in crystalline DyF3

  2. Low-energy robust host heavily doped with Dy3+ for emission at 1.3 to 1.4

    International Nuclear Information System (INIS)

    A transparent, heavily Dy3+-doped oxyfluoride nano-glass-ceramic, 32(SiO2)9(AlO1.5)31.5(CdF2)18.5(PbF2) 5.5(ZnF2):3.5(DyF3) (mol%), has been fabricated, where the Dy3+ dopants dissolve mostly in the 8 nm diameter β-PbF2-type nanocrystals. We propose the chemical composition of this Dy3+-doped PbF2-type crystalline nanophase is of tveitite type and approaches Pb3DyF9. The low vibration energy of the Dy3+ site results in an intense emission band 6H9/2,6F11/2 → 6H15/2 of Dy3+, centered at about 1.35 μm with a 120 nm half-height width and a 150 μs lifetime with negligible temperature dependence. This emission band has a potential application as a broad-band short-length optical amplifier operating in the extended telecommunications window at about 1.3 to 1.4 μm. (copyright 2007 WILEY-VCH Verlag GmbH and Co. KGaA, Weinheim) (orig.)

  3. Effect of Dy on oxide scale adhesion of NiAl coatings at 1200 {sup o}C

    Energy Technology Data Exchange (ETDEWEB)

    Guo Hongbo, E-mail: guo.hongbo@buaa.edu.c [Key Laboratory of Aerospace Materials and Performance (Ministry of Education), No. 37, Xueyuan Road, Beijing 100191 (China); School of Material Science and Engineering, Beihang University, No. 37 Xueyuan Road, Beijing 100191 (China); Zhang Tian; Wang Shixing [Key Laboratory of Aerospace Materials and Performance (Ministry of Education), No. 37, Xueyuan Road, Beijing 100191 (China); Gong Shengkai [Key Laboratory of Aerospace Materials and Performance (Ministry of Education), No. 37, Xueyuan Road, Beijing 100191 (China); School of Material Science and Engineering, Beihang University, No. 37 Xueyuan Road, Beijing 100191 (China)

    2011-06-15

    Highlights: {yields} {beta}-NiAlDy coatings were produced by electron beam physical vapor deposition. {yields} The cyclic oxidation behaviour of the {beta}-NiAl coatings were evaluated at 1200 {sup o}C. {yields} The microstructure of scale and chemistry of oxide/NiAl interface were studied. - Abstract: The cyclic oxidation behaviour of {beta}-NiAlDy coatings produced by electron beam physical vapour deposition (EB-PVD) was investigated. For the Dy-free NiAl coating, numerous voids developed at the Al{sub 2}O{sub 3} scale/NiAl interface and sulfur was found to segregate at the void surfaces, leading to early spallation of the scale. The addition of Dy prevented sulfur segregation and void formation at the scale/NiAl interface. As a result, the scale grown on the NiAlDy coating remained adherent and no spallation occurred even after 400 h cyclic oxidation. The 0.05 at.% Dy doped coating revealed lower oxidation rate than the more Dy doped coatings.

  4. Separation and recovery of high grade Dy2O3 by solvent extraction process with DEHPA in kerosene

    International Nuclear Information System (INIS)

    During the solvent extraction (SX) fractionation of rare earths chloride obtained from monazite, a heavy RE (HRE) fraction assaying 60% Y2O3 is produced. This is purified further to 93% Y2O3 by another SX cycle. During this step most of Dy and Tb get separated to yield a concentrate assaying >50% Dy2O3. An attempt has been made to process this Dy rich concentrate to obtain a high grade Dy2O3 by a SX route using DEHPA in kerosene. The distribution data (D vs Hi+) of Dy have been generated experimentally at various metal concentrations and similar data for other metals present (Gd, Tb, Y, Er and Ho) have been derived using a mathematical expression developed in our laboratory. Based on this information mathematical models for extraction behaviour of these HRE have been derived and used in a computer program developed for multicomponent system. This program has been utilised to optimise the process parameters to obtain 95-97% pure Dy2O3 at about 90% recovery. The parameters have been experimentally confirmed and Dy2O3 95.5% pure w.r.t. Tb was obtained at about 90% recovery, thus confirming the validity of the program. This paper presents data obtained during these investigations. (author). 6 refs., 5 tabs

  5. LiikeAkatemian brändimielikuvan tutkiminen ja brändin kehittäminen

    OpenAIRE

    Petäsnoro, Iida-Mari; Rajala, Emilia

    2014-01-01

    Toteutamme opinnäytetyömme Lapin ammattikorkeakoulussa Tornion kampuksella toimivalle LiikeAkatemialle, jossa opiskellaan käytännönläheisesti tiimiyrityksissä. Tavoitteenamme on tutkia LiikeAkatemian aikaisempaa brändimarkkinointia, ja sen vaikutusta nykyisen brändimielikuvan tilaan liiketalouden opettajien ja opiskelijoiden keskuudessa. Näiden tutkimustulosten perusteella esitämme brändin kehittämiseen liittyviä kehitysideoita. Työn teoreettinen viitekehys on koottu aiheeseen liittyvästä...

  6. MgO:Dy{sup 3+} nanophosphor: Self ignition route, characterization and its photoluminescence properties

    Energy Technology Data Exchange (ETDEWEB)

    Devaraja, P.B. [Prof. C.N.R. Rao Centre for Advanced Materials, Tumkur University, Tumkur 572 103 (India); Department of Physics, C.M.R.T.U, RV College of Engineering, Bangalore 560 059 (India); Department of Physics, Acharya Institute of graduate studies, Bangalore 560 090 (India); Avadhani, D.N. [Department of Physics, C.M.R.T.U, RV College of Engineering, Bangalore 560 059 (India); Nagabhushana, H., E-mail: bhushanvlc@gmail.com [Prof. C.N.R. Rao Centre for Advanced Materials, Tumkur University, Tumkur 572 103 (India); Prashantha, S.C., E-mail: scphysics@gmail.com [Research Center, Department of Science, East West Institute of Technology, Bangalore 560 091 (India); Sharma, S.C. [Chattisgarh Swamy Vivekananda Technological University, Bhilai, CG 493441 (India); Nagabhushana, B.M. [Department of Chemistry, M.S. Ramaiah Institute of Technology, Bangalore 560 054 (India); Nagaswarupa, H.P. [Research Center, Department of Science, East West Institute of Technology, Bangalore 560 091 (India); Daruka Prasad, B. [Department of Physics, B.M.S. Institute of Technology, Yelahanka, Bangalore 560 064 (India)

    2014-11-15

    For the first time series of MgO phosphors doped with different concentrations of Dy{sup 3+} (1–9 mol%) were prepared by solution combustion method using glycine as a fuel. The final products were well characterized by powder X-ray diffraction, Fourier transform infrared spectroscopy, scanning electron microscopy and transmission electron microscopy. The powder X-ray diffraction patterns of the as-formed product show single cubic phase. The crystallite size estimated using Scherrer's method was found to be in the range 5–15 nm and the same was confirmed by transmission electron microscopy result. Photoluminescence properties of Dy{sup 3+} (1–9 mol%) doped MgO for near ultra violet excitation (325 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 Dy{sup 3+}, namely {sup 4}F{sub 9/2} → {sup 6}H{sub 15/2} (483 nm), and {sup 4}F{sub 9/2} → {sup 6}H{sub 13/2} (573 nm). Further, the emission at 573 nm shows strong yellow emission and can be applied to the yellow emission of phosphor for the application for near ultraviolet excitation. The intensity of yellow emission was attributed to intrinsic defects, especially oxygen-vacancies, which could assist the energy transfer from the MgO host to the Dy{sup 3+} ions. The Commission International De I-Eclairage chromaticity co-ordinates were calculated from emission spectra, the values (x,y) were very close to the National Television System Committee standard value of white emission. Therefore, the present phosphor was highly useful for display applications. - Graphical Abstract: PL emission spectra and CIE diagram of MgO:Dy{sup 3+} nanophosphor. - Highlights: • MgO:Dy{sup 3+} prepared by simple and low cost LCS method at low temperature (400 °C). • Characteristic emission peaks of Dy{sup 3+} ion at ∼ 483 and 573 nm are recorded. • CIE co-ordinate values located in the white region.

  7. 选择性氧化壳聚糖对真丝织物姜黄染色性能的影响%Effect of selective oxidized chitosan on the dyeing properties of silk fabric dyed by turmeric

    Institute of Scientific and Technical Information of China (English)

    王浩; 凌志华; 胡显荣; 饶娟; 赵敏

    2015-01-01

    针对姜黄天然染料对真丝织物直接染色表面色深度(K/S值)低、染色牢度差的问题,利用壳聚糖与TEMPO-NaO-Cl-NaBr氧化体系制备选择性氧化壳聚糖改性剂对丝织物进行改性.与未经改性的真丝织物相比,经氧化壳聚糖改性织物的姜黄上染率明显提高,且随着壳聚糖氧化程度增加,改性真丝织物的姜黄上染率呈上升趋势.以姜黄改性真丝织物的上染率为指标,确定氧化壳聚糖对真丝织物最佳整理工艺为:氧化壳聚糖质量分数1%,温度65℃,时间1.5 h,浴比1:50.经氧化壳聚糖改性的真丝织物具有良好的K/S值和染色牢度.%Aiming at problems of low color depth (K/S value) and poor color fastness of silk fabric directly dyed with natural dye turmeric, the modification agent of selective oxidized chitosan was prepared from chito-san and TEMPO- NaOCl- NaBr oxidation system and applied to modify silk fabric. Compared with untreated silk fabric, the dye- uptake of silk fabric dyed with turmeric was increased remarkably after treated with oxi-dized chitosan. And with increasing the oxidation degree of chitosan, the dye- uptake of the treated silk fabric dyed with turmeric increased constantly. Based on the dye- uptake of treated silk fabric dyed with turmeric, the optimum modification process of silk fabric treated with oxidized chitosan was determined: the mass frac-tion of oxidized chitosan 1%, reacted at 65 ℃ for 1.5 h, the liquor ratio 1:50. The silk fabric treated with oxi-dized chitosan had good K/S value and color fastness.

  8. Chiral Brønsted Acids for Asymmetric Organocatalysis

    Science.gov (United States)

    Kampen, Daniela; Reisinger, Corinna M.; List, Benjamin

    Chiral Brønsted acid catalysis is an emerging area of organocatalysis. Since the pioneering studies of the groups of Akiyama and Terada in 2004 on the use of chiral BINOL phosphates as powerful Brønsted acid catalysts in asymmetric Mannich-type reactions, numerous catalytic asymmetric transformations involving imine activation have been realized by means of this catalyst class, including among others Friedel-Crafts, Pictet-Spengler, Strecker, cycloaddition reactions, transfer hydrogenations, and reductive aminations. More recently, chiral BINOL phosphates found application in multicomponent and cascade reactions as for example in an asymmetric version of the Biginelli reaction. With the introduction of chiral BINOL-derived N-triflyl phosphoramides in 2006, asymmetric Brønsted acid catalysis is no longer restricted to reactive substrates. Also certain carbonyl compounds can be activated through these stronger Brønsted acid catalysts. In dealing with sensitive substrate classes, chiral dicarboxylic acids proved of particular value.

  9. Brüssel - unistus Euroopa pealinnast / Kristi Grishakov

    Index Scriptorium Estoniae

    Grishakov, Kristi

    2008-01-01

    Brüsseli linnaplaneerimise ajaloost, linnaehituslikest ja sotsiaalset laadi probleemidest, võimalikust tulevikust Euroopa pealinnana. Berlage Instituudi näitusest "A Vision for Brussels" Bozari kunstikeskuses

  10. 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

  11. Traian Brăileanu în documente (I

    Directory of Open Access Journals (Sweden)

    Radu-Florian Bruja

    2006-11-01

    Full Text Available A Romanian’s politician from Bukovina, Traian Brăileanu agreed the idea of possible activities of former political parties. Although he was a regional party, his activity was oriented to complete the unification and consolidation of Romania. Traian Brăileanu was a sociologist and doctor Professor at University of Cernăuţi. A polyglot, TraianBrăileanu has known the Greek and German’s philosophy. He has begun his political activity in People’s Party, then in League of National and Christian Protection and finally in The Legionary Movement. We bring bock into scientific circuit some documents from the personal records of Traian Brăileanu. This documents covering the period 1920-1921 on the ground of some investigations archirved by the author from Cernăuţi, Ukraina.

  12. Preparation of 166 Dy/166 Ho DTPA-bis biotin as a system of In vivo generator

    International Nuclear Information System (INIS)

    The objective of this work was to synthesize the complex 166 Dy/166 Ho - diethylen triamine pentaacetic-bis Biotin (166 Dy/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 164 Dy203 in the TRIGA Mark III reactor. The labelled was carried out in aqueous solution to p H 8.0 for addition of 166 Dy Cl3 to the diethylen triamine pentaacetic-α, ω-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 166 Dy/166 Ho DTPA-bis Biotin was obtained with a radiochemical purity of 99.1 ± 0.6%. The biological recognition of the complex 166 Dy/166 Ho DTPA-bis Biotin for the avidin it doesn't affect the labelling procedure. The studies in vitro demonstrated that the 166 Dy/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 166 Dy that could produce the 166 Ho3+ liberation. The studies of Biodistribution in healthy mice demonstrated that the one complex 166 Dy/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)

  13. 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...

  14. Transport properties of BiTe-SbTe superlattices

    International Nuclear Information System (INIS)

    During the last decade BiTe-SbTe multilayers attracted much attention due to their enhanced thermoelectric figure of merit compared to the bulk materials. To shed light on the origin of this enhancement, we studied the electronic structure of (Bi2Te3)x(Sb2Te3)N-x superlattices with a fully relativistic screened Korringa-Kohn-Rostoker Green's function method. The electrical conductivity was calculated within the relaxation time approximation of the Boltzmann theory. The effect of composition (x) on the transport near the Fermi energy and the consequences for the thermoelectric properties were studied in detail.

  15. Enhanced upconversion emission of Dy3+-doped tellurite glass by heat-treated silver nanoparticles

    International Nuclear Information System (INIS)

    Dy3+-doped lead sodium tellurite glasses containing silver nanoparticles (NPs) were synthesized by a melt-quenching technique and treated for different annealing time intervals above the glass transition temperature. The glass samples were characterized by UV–vis–IR absorption spectroscopy, photoluminescence spectroscopy and transmission electron microscope imaging. Eight absorption peaks of Dy3+ ions were observed indicating the transitions from ground state to different excited states. The surface plasmon resonance (SPR) peak of silver NPs was probed at 522 nm. Blue, yellow and red luminescence emissions were recorded at 485, 578 and 665 nm. The intensity of emission peaks for heat-treated samples containing silver NPs found to be 1.7–4 times larger than their singly-doped counterpart. Such enhancements are attributed to the modification of the local field due to difference between dielectric constants of metal and surrounding medium as the major factor, and energy transfer from nano-metal particles to Dy3+ ions as the minor aspect. The size distribution of silver NPs has a Gaussian shape with a maximum around 18 nm. The glasses can be nominated as promising materials for solid state lasers. - Highlights: • Dy3+-doped sodium lead tellurite glass containing silver NPs are prepared by the melt quench technique. • The surface plasmon band of silver NPs is observed at 522 nm. • Enhancements in the order of 1.7–4 times are obtained for visible lines of Dy3+ ions under 800 nm excitation. • Different mechanisms for enhancements and quenches of emission intensities are discussed

  16. White light simulation and luminescence studies on Dy{sup 3+} doped Zinc borophosphate glasses

    Energy Technology Data Exchange (ETDEWEB)

    Vijayakumar, R. [Department of Physics, Gandhigram Rural University, Gandhigram 624302 (India); Venkataiah, G. [Department of Physics, Sri Venkateswara University, Tirupati 517502 (India); Marimuthu, K., E-mail: mari_ram2000@yahoo.com [Department of Physics, Gandhigram Rural University, Gandhigram 624302 (India)

    2015-01-15

    The Dy{sup 3+} doped Zinc borophosphate glasses with the chemical composition (79-x)B{sub 2}O{sub 3}+xP{sub 2}O{sub 5}+10Li{sub 2}O+10ZnO+1Dy{sub 2}O{sub 3} (where x=0, 10, 20, 30 and 50 in wt%) have been prepared by melt quenching technique. The prepared glass samples were characterized through optical absorption, emission and decay measurements. The bonding parameters, optical band gap and Urbach's energy values were calculated from the optical absorption spectra to explore the bonding nature of the Dy–O metal ligand and electronic band structure of the studied glasses. Judd–Ofelt (JO) intensity parameters were calculated from the absorption spectra by using the JO theory and it gives information about symmetry of the ligand environment around the Dy{sup 3+} ion site. The Y/B intensity ratio and radiative properties were obtained from the emission spectra and the results were compared with the reported literature. The x, y chromaticity color coordinates of the studied glasses were analyzed using a CIE 1931 color chromaticity diagram and found that the x, y coordinates lie in the white light region. The decay curve measurements of the prepared glasses exhibit non-exponential behavior and are well fitted to Inokuti–Hirayama (IH) model to understand the energy transfer mechanism between Dy{sup 3+} ions. The Q, R{sub 0} and C{sub DA} values of the prepared Dy{sup 3+} doped glasses were obtained from the IH model and the results were discussed and compared with the reported literature.

  17. Application of TlBr to nuclear medicine imaging

    Science.gov (United States)

    Cirignano, Leonard; Kim, Hadong; Kargar, Alireza; Churilov, Alexei V.; Ciampi, Guido; Higgins, William; Kim, Suyoung; Barber, Bradford; Haston, Kyle; Shah, Kanai

    2012-10-01

    Thallium bromide (TlBr) has been under development for room temperature gamma ray spectroscopy due to high density, high Z and wide bandgap of the material. Furthermore, its low melting point (460 °C), cubic crystal structure and congruent melting with no solid-solid phase transitions between the melting point and room temperature, TlBr can be grown by relatively simple melt based methods. As a result of improvements in material processing and detector fabrication over the last several years, TlBr with electron mobility-lifetime products (μeτe) in the mid 10-3 cm2/V range has been obtained. In this paper we are going to report on our unipolar charging TlBr results for the application as a small animal imaging. For SPECT application, about 5 mm thick pixellated detectors were fabricated and tested. About 1 % FWHM at 662 keV energy resolution was estimated at room temperature. By applying the depth correction technique, less than 1 % energy resolution was estimated. We are going to report the results from orthogonal strip TlBr detector for PET application. In this paper we also present our latest detector highlights and recent progress made in long term stability of TlBr detectors at or near room temperature. This work is being supported by the Domestic Nuclear Detection Office (DNDO) and the Department of Energy (DOE).

  18. Ca2+-Doped CeBr3 Scintillating Materials

    Energy Technology Data Exchange (ETDEWEB)

    Guss, Paul [NSTec; Foster, Michael E. [SNL; Wong, Bryan M. [SNL; Doty, F. Patrick [SNL; Shah, Kanai [RMD; Squillante, Michael R. [RMD; Shirwadkar, Urmila [RMD; Hawrami, Rastgo [RMD; Tower, Josh [RMD; Yuan, Ding [NSTec

    2014-01-01

    Despite the outstanding scintillation performance characteristics of cerium tribromide (CeBr3) and cerium-activated lanthanum tribromide, their commercial availability and application are limited due to the difficulties of growing large, crack-free single crystals from these fragile materials. This investigation employed aliovalent doping to increase crystal strength while maintaining the optical properties of the crystal. One divalent dopant (Ca2+) was used as a dopant to strengthen CeBr3 without negatively impacting scintillation performance. Ingots containing nominal concentrations of 1.9% of the Ca2+ dopant were grown. Preliminary scintillation measurements are presented for this aliovalently doped scintillator. Ca2+-doped CeBr3 exhibited little or no change in the peak fluorescence emission for 371 nm optical excitation for CeBr3. The structural, electronic, and optical properties of CeBr3 crystals were studied using the density functional theory within the generalized gradient approximation. The calculated lattice parameters are in good agreement with the experimental data. The energy band structures and density of states were obtained. The optical properties of CeBr3, including the dielectric function, were calculated.

  19. The Non-Isotypical Nitride Selenides Dy3NSe3 and Ho3NSe3: Chains and Dimers

    OpenAIRE

    Lissner, Falk; Schleid, Thomas

    2009-01-01

    Abstract The non-isotypical lanthanoid(III) nitride selenides M3NSe3 of dysprosium (Dy3NSe3) and holmium (Ho3NSe3) are formed by the reaction of the respective rare-earth metal (M = Dy and Ho) with sodium azide (NaN3), selenium and an excess of iodine at 900 ?C from torch-sealed evacuated silica ampoules within seven days. Dy3NSe3 crystallizes orthorhombically (a = 1245.38(9), b = 393.69(3), c = 1303.74(9) pm) in space group Pnma with Z = 4, whereas monoclinic Ho3NSe3 (a = 1152.93(...

  20. CaSO4:DY,Mn: A new and highly sensitive thermoluminescence phosphor for versatile dosimetry

    Science.gov (United States)

    Bahl, Shaila; Lochab, S. P.; Kumar, Pratik

    2016-02-01

    With the advent of newer techniques for dose reduction coupled with the development of more sensitive detectors, the radiation doses in radiological medical investigation are decreasing. Nevertheless, keeping the tenet in mind that all radiation doses could entail risk, there is a need to develop more sensitive dosimeters capable of measuring low doses. This paper gives the account of the development of a new and sensitive phosphor CaSO4:Dy,Mn and its characterization. The standard production procedure based on the recrystallization method was used to prepare CaSO4:Dy,Mn. The Thermoluminescence (TL) studies were carried out by exposing it with gamma radiation (Cs-137) from 10 μGy to 100 Gy. The theoretical studies to determine the number of peaks and kinetic parameters related to the TL glow peaks in CaSO4:Dy,Mn was performed using the Computerized Glow Curve Deconvolution (CGCD) method. Experiments were performed to determine optimum concentration of the dopants Dysprosium (Dy) and Mangnese (Mn) in the host CaSO4 so that maximum sensitivity of the phosphor may be achieved. The optimum dopant concentration turned out to be 0.1 mol%. As there were two dopants Dy and Mn their relative ratio were varied in steps of 0.025 keeping the concentration of total dopant (Dy and Mn) 0.1 mol% always. The maximum TL intensity was seen in the CaSO4:Dy(0.025),Mn(0.075) combination. The TL sensitivity of this phosphor was found to be about 2 and 1.8 times higher than that of popular phosphor CaSO4:Dy and LiF:Mg,Cu,P (TLD-700H) respectively. This new phosphor CaSO4:Dy,Mn showed fading of 11% which is similar to that of the standard phosphor CaSO4:Dy. The paper concludes that the new, highly sensitive TL phosphor CaSO4:Dy,Mn has shown higher sensitivity and hence the potential to replace commonly used CaSO4:Dy.

  1. Electronic structures of HgTe and CdTe surfaces and HgTe/CdTe interfaces

    Science.gov (United States)

    Schick, J. T.; Bose, S. M.; Chen, A.-B.

    1989-01-01

    A Green's-function method has been used to study the surface and interface electronic structures of the II-VI compounds HgTe and CdTe. Localized surface and resonance states near the cation-terminated (100) surface of CdTe and the anion-terminated surface of HgTe have been found for the ideal surfaces. The energies and strengths of these surface states are altered by surface perturbations. The bulk states near the surface are drastically modified by the creation of the surface, but the band gaps remain unchanged. Numerical evaluation of the local densities of states at the Gamma and J points shows that, at the (100) interface of HgTe/CdTe, the previously observed surface states are no longer present. However, in the interface region, bulk states of one material penetrate some distance into the other material.

  2. Wavelength calculation of highly stripped ions S10+→S13+, Br23+, Br24+, Ge20+, Ge21+

    International Nuclear Information System (INIS)

    Wavelengths of highly stripped ions S10+ →S13+ , Br23+ , Br24+ , Ge20+ , Ge21+ are calculated by means of GRASP code. The calculations are performed based on multiconfiguration Dirac-Fock technique. Corrections to the energy levels due to the retarded Coulomb interaction (Breit interaction) and the polarization of the vacuum by the nuclear distribution and electron self-energy are included in a perturbation approximation. Comparisons with the new experimental data by CIAE group are presented

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

    OpenAIRE

    Dorf, M.; H. Bösch; Butz, A.; Camy-Peyret, C.; Chipperfield, M. P.; Engel, A.; Goutail, F.; Grunow, K.; Hendrick, F.; Hrechanyy, S.; B. Naujokat; J.-P. Pommereau; Van Roozendael, M.; C. Sioris; F. Stroh

    2006-01-01

    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 ...

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

    OpenAIRE

    Dorf, M.; H. Bösch; Butz, A.; Camy-Peyret, C.; Chipperfield, M. P.; Engel, A.; Goutail, F.; Grunow, K.; Hendrick, F.; Hrechanyy, S.; B. Naujokat; J.-P. Pommereau; Van Roozendael, M.; C. Sioris; F. Stroh

    2005-01-01

    For the first time, results of all four existing 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-b...

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

    OpenAIRE

    Dorf, M.; H. Bösch; Butz, A.; Camy-Peyret, C.; Chipperfield, M. P.; Engel, A.; Goutail, F.; Grunow, K.; Hendrick, F.; Hrechanyy, S.; B. Naujokat; Pommereau, J.-P.; Van Roozendael, M.; C. Sioris; F. Stroh

    2005-01-01

    International audience For the first time, results of all four existing 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 observat...

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

    OpenAIRE

    Dorf, M.; H. Bösch; Butz, A.; Camy-Peyret, C.; Chipperfield, M. P.; Engel, A.; Goutail, F.; Grunow, K.; Hendrick, F.; Hrechanyy, S.; B. Naujokat; Pommereau, J.-P.; Van Roozendael, M.; C. Sioris; F. Stroh

    2006-01-01

    International audience 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 ...

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

    OpenAIRE

    Dorf, Marcel; Bösch, Hartmut; BUTZ Andre; Camy-Peyret, Claude C.; Chipperfield, Martyn P.; Engel, Andreas; Goutail, Florence; Grunow, Katja; Hendrick, François; Hrechanyy, Serhiy; Naujokat, Barbara; Pommereau, Jean-Pierre; Van Roozendael, Michel; Sioris, Christopher E.; Stroh, Fred

    2005-01-01

    For the first time, results of all four existing 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-b...

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

    OpenAIRE

    Dorf, Marcel; Bösch, Hartmut; BUTZ Andre; Camy-Peyret, Claude C.; Chipperfield, Martyn P.; Engel, Andreas; Goutail, Florence; Grunow, Katja; Hendrick, François; Hrechanyy, Serhiy; Naujokat, Barbara; Pommereau, Jean-Pierre; Van Roozendael, Michel; Sioris, Christopher E.; Stroh, Fred

    2006-01-01

    For the first time, results of all four existing 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-b...

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

    OpenAIRE

    Dorf, M.; H. Bösch; B. Naujokat; Pommereau, J. P.; Van Roozendael, M.; C. Sioris; F. Stroh; Weidner, F.; K. Pfeilsticker; Butz, A.; Camy-Peyret, C.; Chipperfield, M. P.; Engel, A.; Goutail, F.; Grunow, K.

    2006-01-01

    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...

  10. 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.

  11. Photodissociation Dynamics of C{sub 6}F{sub 5}Br at 234 nm: Fluorination Effects on Br/Br{sup *} Formation Pathways

    Energy Technology Data Exchange (ETDEWEB)

    Paul, Dababrata; Kim, Hyun Kook; Kim, Tae Kyu [Pusan National Univ., Busan (Korea, Republic of)

    2013-03-15

    Photodissociation dynamics of organic halides has been extensively investigated due to its potential to the stratosphere ozone depletion and relevant environmental problems. For example, alkyl bromide as the simplest organic halides has been used for model of photodissociation dynamics. The A-band of alkyl bromide arises from the C-Br bond localized σ{sup *} → n transition and consists of three overlapping transitions to repulsive states ({sup 3}Q{sub 1}, {sup 3}Q{sub 0}, and {sup 1}Q{sub 1}: on ascending order of excitation energy). The dominant transition in the A-band is to the {sup 3}Q{sub 0+} state which correlates to the Br{sup *}({sup 2}P{sub 1/2}) products, suggesting the spin-orbit ground Br({sup 2}P{sub 3/2}) atom formation arises as a results of nonadiabatic coupling between the {sup 3}Q{sub 0+} and {sup 2}Q{sub 1} PESs via a conical intersection along the C. Br bond coordinate.

  12. Molecular dynamics simulations of Si etching in Cl- and Br-based plasmas: Cl+ and Br+ ion incidence in the presence of Cl and Br neutrals

    International Nuclear Information System (INIS)

    Classical molecular dynamics (MD) simulations have been performed for Cl+ and Br+ ions incident on Si(100) surfaces with Cl and Br neutrals, respectively, to gain a better understanding of the ion-enhanced surface reaction kinetics during Si etching in Cl- and Br-based plasmas. The ions were incident normally on surfaces with translational energies in the range Ei = 20–500 eV, and low-energy neutrals of En = 0.01 eV were also incident normally thereon with the neutral-to-ion flux ratio in the range Γn0/Γi0 = 0–100, where an improved Stillinger--Weber potential form was employed for the interatomic potential concerned. The etch yields and thresholds presently simulated were in agreement with the experimental results previously reported for Si etching in Cl2 and Br2 plasmas as well as in Cl+, Cl2+, and Br+ beams, and the product stoichiometry simulated was consistent with that observed during Ar+ beam incidence on Si in Cl2. Moreover, the surface coverage of halogen atoms, halogenated layer thickness, surface stoichiometry, and depth profile of surface products simulated for Γn0/Γi0 = 100 were in excellent agreement with the observations depending on Ei reported for Si etching in Cl2 plasmas. The MD also indicated that the yield, coverage, and surface layer thickness are smaller in Si/Br than in Si/Cl system, while the percentage of higher halogenated species in product and surface stoichiometries is larger in Si/Br. The MD further indicated that in both systems, the translational energy distributions of products and halogen adsorbates desorbed from surfaces are approximated by two Maxwellians of temperature T1 ≈ 2500 K and T2 ≈ 7000–40 000 K. These energy distributions are discussed in terms of the desorption or evaporation from hot spots formed through chemically enhanced physical sputtering and physically enhanced chemical sputtering, which have so far been speculated to both occur in the ion-enhanced surface reaction

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

    Science.gov (United States)

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

    2015-01-01

    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.

  14. 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.

  15. Energy transfer and luminescent properties of Pr3+and/or Dy3+doped NaYF4 and NaGdF4

    Institute of Scientific and Technical Information of China (English)

    由芳田; 张新国; 彭洪尚; 黄世华; 黄艳; 陶冶

    2013-01-01

    The phosphors that are able to convert vacuum ultraviolet (VUV) light into visible light are demanded for the development of novel displaying and lighting devices. NaYF4:Pr3+,Dy3+, NaGdF4:Pr3+, NaGdF4:Dy3+ and NaGdF4:Pr3+,Dy3+ were prepared by hydrothermal synthesis method and their luminescent properties in VUV-vis spectral region were investigated at room temperature. For NaYF4:Pr3+,Dy3+, no energy transfer process from Pr3+to Dy3+was observed. However, the introduction of Gd3+into the fluoride lattice led to intense Dy3+emissions upon Pr3+4f5d state excitation. Gd3+acted as an intermediate, resulting in efficient energy trans-fer from Pr3+to Dy3+in NaGdF4. Pr3+transferred most of its energy to Gd3+, and then the energy was transferred from Gd3+to Dy3+. So NaGdF4:Pr3+,Dy3+not only took full advantage of the intense Pr3+4f5d absorption, but converted the VUV excitation light into the near-white emission of Dy3+.

  16. 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.

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

    Directory of Open Access Journals (Sweden)

    M. Dorf

    2005-12-01

    Full Text Available For the first time, results of all four existing 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, (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±2.8pptv 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 agree to <±50% with the photochemically-corrected balloon observations, and tend to show less agreement

  18. The study of antibacterial activity and stability of dyed cotton fabrics modified with different forms of silver

    Directory of Open Access Journals (Sweden)

    Lazić Vesna

    2012-01-01

    Full Text Available This study compares the effect of colloidal silver nanoparticles and commercial RUCO-BAC AGP agent with silver chloride as an active component on antibacterial activity of dyed cotton fabrics. Cotton fabrics were dyed with vat dyes Bezanthren olive T and Bezanthren grey FFB. Antibacterial activity of silver loaded dyed cotton fabrics was tested against Gram-positive bacterium Staphylococcus aureus and Gram-negative bacterium Escherichia coli. Unlike RUCO-BAC AGP synthesized silver nanoparticles deposited onto dyed cotton fabrics provided maximum bacteria reduction independently of applied dye. The stability of modified cotton fabrics was analyzed in artificial sweat at pH 5.5 and 8.0. Approximately the same amount of silver was released from differently modified cotton fabrics in artificial sweat. Larger amount of silver was released in the sweat at pH 8.0.

  19. Diffusion processes in hot-deformed Nd-Fe-B magnets with DyF3 additions

    Science.gov (United States)

    Sawatzki, Simon; Dirba, Imants; Wendrock, Horst; Schultz, Ludwig; Gutfleisch, Oliver

    2014-05-01

    Nd-Fe-B melt spun ribbons have been hot-compacted and subsequently die-upset together with DyF3 in order to increase coercivity in nanocrystalline hot-deformed magnets. Magnetic measurements reveal enhanced coercivities for low and reduced coercivities for high Dy-fractions. This behaviour is due to a superposition of the formation of (Dy,Nd)2Fe14B and non-magnetic Dy and Nd fluoride and oxide phases. Energy dispersive and wavelength dispersive X-ray elemental maps verified this feature. Heat treatments at 600 °C induce a strong F diffusion along the flake boundaries without inducing grain growth. This diffusion is correlated with the changes in magnetic properties.

  20. Directional frustration of magnetic moments in (U0.50Dy0.50)Ni2B2C

    International Nuclear Information System (INIS)

    Polycrystalline (U0.50Dy0.50)Ni2B2C solid solution was prepared and found by X-ray diffraction to crystallize in BCT LuNi2B2C-type structure (space group I4/mmm) of the end compounds UNi2B2C and DyNi2B2C. AC susceptibility and magnetization show paramagnetic behavior down to 6.5 K, with the values θ=-5(5) K and μeff=7.7(1) μB, compatible with those of the end compounds, and indicate possible cooperative phenomena at lower temperatures. The observed paramagnetism, at variance with antiferromagnetic ordering in (Pr0.50Dy0.50)Ni2B2C, is attributed to a directional frustration of the magnetic moments on the (U,Dy) site

  1. VizieR Online Data Catalog: Optical and UV photometry of SN 2013dy (Zhai+, 2016)

    Science.gov (United States)

    Zhai, Q.; Zhang, J.-J.; Wang, X.-F.; Zhang, T.-M.; Liu, Z.-W.; Brown, P. J.; Huang, F.; Zhao, X.-L.; Chang, L.; Yi, W.-M.; Wang, C.-J.; Xin, Y.-X.; Wang, J.-G.; Lun, B.-L.; Zhang, X.-L.; Fan, Y.-F.; Zheng, X.-M.; Bai, J.-M.

    2016-08-01

    SN2013dy, an Type Ia supernova (SNIa), was discovered at roughly a magnitude of ~17.2mag on UT July 10.45 2013 (Universal Time) in an unfiltered image of the galaxy NGC7250 by the Lick observatory supernova search (Casper et al., 2013CBET.3588....1C). Our first observation of SN 2013dy is in spectroscopy on 2013 July 14 (Zhang & Wang 2013CBET.3394....1Z; 4.76days after the first light and published in Zheng et al. 2013ApJ...778L..15Z) with the Yunnan Faint Object Spectrograph and Camera (YFOSC) mounted at the Li-Jiang 2.4m Telescope (LJT) of Yunnan Observatories (YNAO), China. About two weeks later, we started to monitor this transient intensively at LJT in both ground-based UBVRI photometry and spectroscopy spanning from t~+0 to t~+180days. Ten local standard stars (see Table1 in the paper) in the field of SN2013dy are used to transform the instrumental magnitudes of SN2013dy to the standard Johnson UBV and Kron-Cousins RI system, as listed in Table2. Optical photometry data are also collected with the Tsinghua-NAOC 0.8m telescope (TNT) at Xing-Long Observation of National Astronomical Observatories (NAOC), China, from t~-2days to t~+150days. Additionally, three spectra were obtained at the Xing-Long 2.16 m telescope (hereafter XLT) with the Bei-Jing Faint Object Spectrograph and Camera (BFOSC). Furthermore, this target was also observed by the Ultra-Violet/Optical Telescope (UVOT) on board the Swift satellite. The Swift observatory began observing SN 2013dy on 2013 July 17.09, about 10days (t~-10days) before the B band maximum, and continued for approximately 26days (t~+15days). These photometric observations are performed in three UV filters (uvw2, uvm2, and uvw1) and three broadband optical filters (uu, bb, and vv). Table3 lists the final UVOT UV/optical magnitudes of SN2013dy. (2 data files).

  2. Dy{sup 3+}:Ca{sub 2}SnO{sub 4}, a new yellow phosphor with afterglow behavior

    Energy Technology Data Exchange (ETDEWEB)

    Shi, Mingming; Zhang, Dongyun, E-mail: dyz@sit.edu.cn; Chang, Chengkang

    2015-08-05

    Highlights: • The photoluminescence and afterglow behavior of Dy{sup 3+}:Ca{sub 2}SnO{sub 4} was investigated. • PL spectra revealed the {sup 4}F{sub 9/2} → {sup 6}H{sub J} (J = 15/2, 13/2, 11/2) energy transition of Dy{sup 3+} ions in Ca{sub 2}SnO{sub 4}. • CIE chromaticity coordinates results confirmed a yellow light emitting of the Dy{sup 3+}:Ca{sub 2}SnO{sub 4}. • After the UV source was turned off, the Dy{sup 3+}:Ca{sub 2}SnO{sub 4} showed typical afterglow behavior. • The afterglow behavior of Dy{sup 3+}:Ca{sub 2}SnO{sub 4} was attributed to suitable electron and hole traps. - Abstract: This paper reports the photoluminescence and afterglow behavior of Dy{sup 3+} in Ca{sub 2}SnO{sub 4} matrix (Dy{sup 3+}:Ca{sub 2}SnO{sub 4}) prepared via a solid-state reaction. X-ray diffraction (XRD), photo luminescence spectroscope (PLS) and thermal luminescence spectroscope (TLS) were performed to investigate the physical properties of the phosphors. Typical {sup 4}F{sub 9/2} to {sup 6}H{sub j} energy transition of Dy{sup 3+} ions was detected by PL spectra. CIE chromaticity coordinates of x = 0.4319, y = 4.456, calculated from the emission spectra, confirmed a yellow light emitting of the Dy{sup 3+}:Ca{sub 2}SnO{sub 4} phosphors. The Ca{sub 2}SnO{sub 4} phosphors showed a typical afterglow behavior when the UV source was switched off. Thermal simulated luminescence study indicated that the persistent afterglow of Dy{sup 3+}:Ca{sub 2}SnO{sub 4} phosphors was generated by the suitable electron or hole traps which was resulted from the doping the Ca{sub 2}SnO{sub 4} host with rare-earth ions (Dy{sup 3+})

  3. Omigapil treatment decreases fibrosis and improves respiratory rate in dy(2J mouse model of congenital muscular dystrophy.

    Directory of Open Access Journals (Sweden)

    Qing Yu

    Full Text Available INTRODUCTION: Congenital muscular dystrophy is a distinct group of diseases presenting with weakness in infancy or childhood and no current therapy. One form, MDC1A, is the result of laminin alpha-2 deficiency and results in significant weakness, respiratory insufficiency and early death. Modification of apoptosis is one potential pathway for therapy in these patients. METHODS: dy(2J mice were treated with vehicle, 0.1 mg/kg or 1 mg/kg of omigapil daily via oral gavage over 17.5 weeks. Untreated age matched BL6 mice were used as controls. Functional, behavioral and histological measurements were collected. RESULTS: dy(2J mice treated with omigapil showed improved respiratory rates compared to vehicle treated dy(2J mice (396 to 402 vs. 371 breaths per minute, p<0.03 and similar to control mice. There were no statistical differences in normalized forelimb grip strength between dy(2J and controls at baseline or after 17.5 weeks and no significant differences seen among the dy(2J treatment groups. At 30-33 weeks of age, dy(2J mice treated with 0.1 mg/kg omigapil showed significantly more movement time and less rest time compared to vehicle treated. dy(2J mice showed normal cardiac systolic function throughout the trial. dy(2J mice had significantly lower hindlimb maximal (p<0.001 and specific force (p<0.002 compared to the control group at the end of the trial. There were no statistically significant differences in maximal or specific force among treatments. dy(2J mice treated with 0.1 mg/kg/day omigapil showed decreased percent fibrosis in both gastrocnemius (p<0.03 and diaphragm (p<0.001 compared to vehicle, and in diaphragm (p<0.013 when compared to 1 mg/kg/day omigapil treated mice. Omigapil treated dy(2J mice demonstrated decreased apoptosis. CONCLUSION: Omigapil therapy (0.1 mg/kg improved respiratory rate and decreased skeletal and respiratory muscle fibrosis in dy(2J mice. These results support a putative role for the use of omigapil in

  4. Preparation of Teflon pellets use of CaSO{sub 4}:Dy TL Material and Study of TL Characteristics

    Energy Technology Data Exchange (ETDEWEB)

    Yang, Jeong Sun

    2000-02-15

    As the handling of radioactive materials is frequent, radiation protection which can be achieved through accurate measurements of the radiation exposure doses is of primary concern to the workers involved. Several types of dosimeters, such as the thermoluminescent dosimeter(TLD), film badge and pocket dosimeter, have been used to monitor personal exposure doses. Among these, TLD has been generally accepted as the most accurate and reliable method of personal dosimetry, because of its superior and long term stability. All of the TLDs currently used in Korea have been imported from abroad, Korea Atomic Energy Research Institute(KAERI) is now developing new types of TLD which has more sensitivity and stability. One of the thermoluminescent material KAERI is presently investigating is CaSO{sub 4}:Dy, in which a small concentration of Dy is added as activator. This thesis presents a method of preparing the CaSO{sub 4}:Dy phosphor-embeded teflon powder which is then compressed to thin pellet form used as the TLD element. Investigations are made to determine optimum preparing conditions which are resulted the largest emission of the thermoluminescence. Also experimental investigations are conducted for the characteristics of the CaSO{sub 4}:Dy Teflon pellet such as the energy response, dose response, reusability, sensitivity, lowest level of detection, and fading. The optimum preparing conditions have been found as: the concentration of activator Dy is 0.1 mol%: the disolved temperature of Dy is 320 .deg. C: the sintering temperature of the CaSO{sub 4}:Dy phosphor is 750 .deg. C for 2 hours: the average grain sizes of the CaSO{sub 4}:Dy phosphor are 100-200{mu}m. Our investigation shows that the sensitivity of the CaSO{sub 4}:Dy pellet is 1.25-time higher than that of the commercial Teledyne CaSO{sub 4}:Dy pellet. A dose response is observed to linear in the range of 10{sup 4} to 10 Gy. The relative energy response(RER) in the low energy region is 9.6(for the {sup 137}Cs

  5. The properties of CdTe solar cells with ZnTe/ZnTe: Cu buffer layers

    Institute of Scientific and Technical Information of China (English)

    Song Huijin; Zheng Jiagui; Feng Lianghuan; Yan Qiang; Lei Zhi; Wu Lili; Zhang Jingquan; Li Wei; Li Bing

    2008-01-01

    CdS/CdTe solar cells with ZnTe/ZnTe:Cu buffer layers were fabricated and studied. The energy band structure of it was analyzed. The C-V, I-V characteristics and the spectral response show that the ZnTe/ZnTe:Cu buffer layers improve the back contact characteristic properties, the diode characteristics of the forward junction and the short-wave spectral response of the CdTe solar cells. The ZnTe/ZnTe:Cu buffer layers affect the solar cell conversion efficiency and its fill factor.

  6. Characterization of CdTe, (Cd,Zn)Te, and Cd(Te,Se) single crystals by transmission electron microscopy

    Science.gov (United States)

    Rai, R. S.; Mahajan, S.; McDevitt, S.; Johnson, C. J.

    1991-10-01

    CdTe, (Cd,Zn)Te, and Cd(Te,Se) crystals grown by the Bridgman technique have been characterized by transmission electron microscopy. Results indicate that the Te precipitates are seen in all the crystals, but their density and size are lowest and largest in the case of Cd(Te,Se) crystals. In addition, dislocations, stacking faults, and microtwins are observed in as-grown CdTe, (Cd,Zn)Te, and Cd(Te,Se) crystals. Arguments have been developed to rationalize these observations and their ramifications on crystal perfection are discussed.

  7. 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 young (less than 21) intoxicated females are a group at high risk for sexual assault on college campuses. (PsycINFO Database Record PMID:27631614

  8. 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.

  9. Radioisotope Thermoelectric Generators Based on Segmented BiTe/PbTe-BiTe/TAGS/PbSnTe

    Science.gov (United States)

    McAlonan, Malachy; Patel, Kalpesh; Cummer, Keith

    2006-01-01

    This paper reports on Phase 1 of a multifaceted effort to develop a more efficient radioisotope thermoelectric generator (RTG) for future NASA missions. The conversion efficiency goal is 10% or higher at a power level of 20 watt or higher. The thermoelectric (T/E) efficiency achievable with present T/E materials is about 8% for favorable temperatures. Thermoelectric converter designs, T/E material properties, and T/E couple thermal and electrical performance were investigated in Phase 1 of this program to find paths to improve conversion efficiency. T/E properties can be improved by optimizing the composition of the materials and by improving the micro structural characteristics such as homogeneity, grain size, and phases present. T/E couple performance can be improved by reducing the electrical and thermal contact resistances of the couple and within the segmented T/E elements. Performance and reliability improvements can be achieved by reducing the thermo-mechanical stresses, improving the quality of the bonds and interfaces, minimizing the number of required bonds, and reducing the degradation rates of both the T/E materials and the bonds. This paper focuses on one portion of the activity, i.e., the design of a small converter. In the converter design effort, a prototypic 20-watt device, suitable for use with a single general-purpose heat source (GPHS), was built using an optimized converter design of segmented thermoelectric elements of heritage composition. The 20-watt prototype achieved the power predicted for the test conditions. The chosen couple design used segmented BiTe/PbTe for the n-type element and BiTe/TAGS/PbSnTe, for the p-type T/E element. Use of the BiTe segment exploits the opportunity of the small RTG to operate at lower heat rejection temperatures and results in much higher conversion efficiency, the main objective of the NASA program. Long term data on similarly segmented couples at Teledyne together with the 20-watt module test results

  10. Study of crystal-field excitations and infrared active phonons in the multiferroic hexagonal DyMnO3

    Science.gov (United States)

    Jandl, S.; Mansouri, S.; Vermette, J.; Mukhin, A. A.; Ivanov, V. Yu; Balbashov, A.; Orlita, M.

    2013-11-01

    In hexagonal DyMnO3, Dy3+ crystal-field excitations are studied as a function of temperature and applied magnetic field. They are complemented with the measurements of infrared active phonon frequency shifts under applied magnetic field at T = 4.2 K. Between TN = 68 K and T = 10 K, the absence of Dy3+ Kramers doublet splittings at either the C3 or the C3v site symmetries indicates that the Mn3+ magnetic order effective exchange field has no component parallel to the c-axis at either site. Below T = 10 K, the ground state Kramers doublet splits under the Dy3+ internal effective field as well as the applied magnetic field. Also, relatively strong infrared active phonon energy shifts are observed in magneto-infrared reflectance measurements at T = 4.2 K, allowing the calculation of the induced electric polarization changes as a function of the applied magnetic field. Such changes are associated with a large magnetoelectric effect in DyMnO3, arising from a charge transfer between Dy3+ and apical oxygen ions.

  11. Preparation of Nanocrystalline Rare Earth Mixed Oxides DyFexCo1-xO3-δ and Its Conductivity

    Institute of Scientific and Technical Information of China (English)

    任引哲; 王建英; 刘二保

    2002-01-01

    Nanocrystalline rare earth mixed oxides DyFexCo1-xO3-δ were prepared by sol-gel method and characterized by X-ray diffraction (XRD), thermogravimetric analysis (TG-DTA) and scanning electron microscope (SEM). The results show that DyFexCo1-xO3-δ has the structure of perovskite type at 800 ℃ for 2 h calcination. The conductivity of the materials at different temperature was measured by four-probe instrumentation and two-pole method. The results show that the conductivity of mixed oxides DyFexCo1-xO3-δ is higher than those of un-mixed oxides DyFeO3 and DyCoO3 and the conductivity is the best at x=0.8 in the matter of DyFexCo1-xO3-δ. The conductivity of these materials always increases with the temperature rising and there is an apparent change between 600 and 800 ℃. However, the spinodals are different with different ration of Fe3+ and Co3+. This kind of oxide is a conductive pottery material.

  12. Optical thermometry based on luminescence behavior of Dy3+-doped transparent LaF3 glass ceramics

    International Nuclear Information System (INIS)

    Dy3+-doped transparent LaF3 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 Dy3+ ion. By using fluorescence intensity ratio method, the 4I15/2 and 4F9/2 of Dy3+ ions are verified as thermally coupled levels. A minimum SR = 1.16 x 10-4 K-1 is obtained at T = 294 K. By doping Eu3+ ion, the overall emission color of Eu3+-Dy3+ co-doped transparent glass ceramics can be tuned from white to yellow with the temperature increase through energy transfer between Eu3+ and Dy3+. Additionally, the thermal stability of the Dy3+ single-doped transparent glass ceramics becomes higher after doping Eu3+ ion. (orig.)

  13. Diffusion processes in hot-deformed Nd–Fe–B magnets with DyF{sub 3} additions

    Energy Technology Data Exchange (ETDEWEB)

    Sawatzki, Simon, E-mail: sawatzki@fm.tu-darmstadt.de [Technische Universität Darmstadt, Materialwissenschaft, Alarich-Weiß-Str. 16, 64287 Darmstadt (Germany); Dirba, Imants [Technische Universität Darmstadt, Materialwissenschaft, Alarich-Weiß-Str. 16, 64287 Darmstadt (Germany); Wendrock, Horst; Schultz, Ludwig [IFW Dresden, P.O. Box 270116, 01171 Dresden (Germany); Gutfleisch, Oliver [Technische Universität Darmstadt, Materialwissenschaft, Alarich-Weiß-Str. 16, 64287 Darmstadt (Germany); Fraunhofer-Projektgruppe für Wertstoffkreisläufe und Ressourcenstrategie IWKS, 63457 Hanau (Germany)

    2014-05-01

    Nd–Fe–B melt spun ribbons have been hot-compacted and subsequently die-upset together with DyF{sub 3} in order to increase coercivity in nanocrystalline hot-deformed magnets. Magnetic measurements reveal enhanced coercivities for low and reduced coercivities for high Dy-fractions. This behaviour is due to a superposition of the formation of (Dy,Nd){sub 2}Fe{sub 14}B and non-magnetic Dy and Nd fluoride and oxide phases. Energy dispersive and wavelength dispersive X-ray elemental maps verified this feature. Heat treatments at 600 °C induce a strong F diffusion along the flake boundaries without inducing grain growth. This diffusion is correlated with the changes in magnetic properties.- Highlights: • Coercivity enhancement of 19% in Nd–Fe–B magnets without a change in remanence. • Annealing at 600 °C promotes a strong F diffusion along the flake boundaries. • Decomposition of DyF{sub 3} and interdiffusion of Dy and Nd during hot-deformation is shown by EDX/WDX.

  14. Electrical and magnetic properties of hot-deformed Nd-Fe-B magnets with different DyF3 additions

    Science.gov (United States)

    Sawatzki, Simon; Dirba, Imants; Schultz, Ludwig; Gutfleisch, Oliver

    2013-10-01

    The effect of deformation and DyF3 additions on the electrical resistivity and the magnetic performance has been studied in hot-deformed Nd-Fe-B melt-spun ribbons and correlated with respective microstructures. Despite the nanocrystallinity of hot-compacted magnets, the specific electrical resistivity measured by four-point-method was shown to be comparable with that of sintered magnets. Die-upsetting reduces electrical resistivity within the magnetically hard plane because of an enhanced shape anisotropy of the grains. The addition of DyF3 overcompensates this reduction due to the presence of electrically insulating Dy-F rich inclusions and thus reduces eddy current losses within the magnet. Magnetic measurements reveal an increase in coercivity without a change in remanence for die-upset magnets with a total height reduction of 63% and 1.2 wt. % Dy (1.6 wt. %DyF3). Both properties, remanence and coercivity, demonstrate an effective reduction in heavy rare earth Dy for Nd-Fe-B magnets.

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

    Science.gov (United States)

    Liu, Yi; Shao, Lingmin; Gao, Jianmin; Guo, Hongwu; Chen, Yao; Cheng, Qingzheng; Via, Brian K.

    2015-03-01

    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 (Cdbnd C) and carbonyl (Cdbnd 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. Reversing ferroelectric polarization in multiferroic DyMn2O5 by nonmagnetic Al substitution of Mn

    Science.gov (United States)

    Zhao, Z. Y.; Liu, M. F.; Li, X.; Wang, J. X.; Yan, Z. B.; Wang, K. F.; Liu, J.-M.

    2014-08-01

    The multiferroic RMn2O5 family, where R is rare-earth ion or Y, exhibits rich physics of multiferroicity which has not yet well understood. DyMn2O5 is a representative member of this family. The ferroelectric polarization of DyMn2O5 is claimed to be magnetically relevant and have more than one component. Therefore, the polarization reversal upon the sequent magnetic transitions is expected. We investigate the evolution of the ferroelectric polarization upon a partial substitution of Mn3+ by nonmagnetic Al3+ in order to tailor the Mn3+-Mn4+ interactions and then to modulate the polarization in DyMn2-x/2Alx/2O5. It is revealed that the polarization can be successfully reversed by Al-substitution via substantially suppressing the Mn3+-Mn4+ interactions, while the Dy3+-Mn4+ interactions can sustain against the substitution until a level as high as x = 0.2. In addition, the independent Dy spin ordering is shifted remarkably down to an extremely low temperature due to the Al3+ substitution. The present work unveils the possibility of tailoring the Mn3+-Mn4+ and Dy3+-Mn4+ interactions independently, and thus reversing the ferroelectric polarization.

  17. Phase diagram and inhomogeneity of (TbDy)-Fe(T) (T=Mn, Co, Al, Ti) systems

    International Nuclear Information System (INIS)

    The Tb-Dy-Fe ternary phase diagram and its Tb0.3Dy0.7-Fe section in the region of the magnetostrictive Laves phase have been investigated. Different segregation behavior for Tb and Dy was proposed and experimentally confirmed. The deviation of the TbDyFe Laves phase composition from its stoichiometric composition and the small Fe solubility range of the Laves phase were also determined. Based on phase selection theory, the pseudocongruent crystallization of REFe2 phase was confirmed. The inhomogeneity of Tb0.3Dy0.7(FeT)1.95 (T=Mn, Co, Al, Ti) alloys has also been investigated. Substitution of Fe by T elements always gave inhomogeneous as-cast alloys. The new phases Fe2Ti and RE2(FeCo) were observed. Obvious composition variations of Tb(Dy) and Fe(Mn) were found, which could be explained as resulting from microsegregation. Homogeneous phases could be obtained after homogenizing annealing while the new phases and the high Tb content in the RE phase remained. The effects of the inhomogeneity on the alloy magnetostrictive properties were also discussed. (orig.)

  18. 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.)

  19. 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.

  20. White Light Emissive Dy(III) Single-Molecule Magnets Sensitized by Diamagnetic [Co(III) (CN)6 ](3-) Linkers.

    Science.gov (United States)

    Chorazy, Szymon; Rams, Michał; Nakabayashi, Koji; Sieklucka, Barbara; Ohkoshi, Shin-Ichi

    2016-05-23

    The self-assembly of Dy(III) -3-hydroxypyridine (3-OHpy) complexes with hexacyanidocobaltate(III) anions in water produces cyanido-bridged {[Dy(III) (3-OHpy)2 (H2 O)4 ] [Co(III) (CN)6 ]}⋅H2 O (1) chains. They reveal a single-molecule magnet (SMM) behavior with a large zero direct current (dc) field energy barrier, ΔE=266(12) cm(-1) (≈385 K), originating from the single-ion property of eight-coordinated Dy(III) of an elongated dodecahedral geometry, which are embedded with diamagnetic [Co(III) (CN)6 ](3-) ions into zig-zag coordination chains. The SMM character is enhanced by the external dc magnetic field, which results in the ΔE of 320(23) cm(-1) (≈460 K) at Hdc =1 kOe, and the opening of a butterfly hysteresis loop below 6 K. Complex 1 exhibits white Dy(III) -based emission realized by energy transfer from Co(III) and 3-OHpy to Dy(III) . Low temperature emission spectra were correlated with SMM property giving the estimation of the zero field ΔE. 1 is a unique example of bifunctional magneto-luminescent material combining white emission and slow magnetic relaxation with a large energy barrier, both controlled by rich structural and electronic interplay between Dy(III) , 3-OHpy, and [Co(III) (CN)6 ](3-) . PMID:26990787

  1. Electron spin resonance evaluation of pure CaSO4 and as a phosphor doped with P and Dy.

    Science.gov (United States)

    de Jesus, E F O; Rossi, A M; Lopes, R T

    2002-01-01

    Polycrystalline CaSO4 powder, doped with different elements but mainly rare earths, is one of the most interesting thermoluminescent (TL) materials. Although many electron spin resonance (ESR) analyses have been reported for these materials few studies have been published about the potential of CaSO4 for ESR dosimetry; almost all studies used CaSO4:Dy with a very low Dy concentration as the material for TL measurements. Pure CaSO4 from Merck was used to prepare CaSO4:Dy and CaSO4:P:Dy with different Dy concentrations. Samples were annealed at 600 degrees C for 1 h before irradiation in a Gammacell 220 irradiator with a 60Co gamma source at a dose rate of 100 Gy x min(-1). The ESR spectra of the pure CaSO4 and CaSO4 doped with P and Dy show the lines usually observed with these types of material, with the factor g around 2.036 and an intense line at g = 2.0011 found only in the pure material. This line, probably an axial SO4-, grows linearly with absorbed dose until 1.0 kGy and shows good stability with time. The line should be stabilized by matrix impurities because it can be removed by a simple treatment with hot sulphuric acid.

  2. 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.

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

    Science.gov (United States)

    Kreycy, S.; Camy-Peyret, C.; Chipperfield, M. P.; Dorf, M.; Feng, W.; Hossaini, R.; Kritten, L.; Werner, B.; Pfeilsticker, K.

    2013-07-01

    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 underestimation

  4. Lifetime measurement of 75Br with inverse kinematic reaction

    International Nuclear Information System (INIS)

    75Br is an isotone of 74Se and 76Kr. Both of them are known for showing shape coexistence with different shape in ground state. It is a question whether odd particle, in this case a proton in 75Br, stabilizes one of the shape or feel the shape co-existence of the core. Transitional probabilities and magnetic moment of the states will help in answering these questions. Thus it motivates us to re-measure the lifetime of excited states of ground state band of 75Br using inverse reaction and to provide necessary information about the feeding time of these states which can then be used in magnetic moment measurement

  5. Redetermination of the Crystal Structure of Al2Br6

    DEFF Research Database (Denmark)

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

    1997-01-01

    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...

  6. Thermal neutron imaging with CsBr storage phosphors

    International Nuclear Information System (INIS)

    The storage phosphor material CsBr:Eu2+ has been investigated for use in thermal neutron imaging. CsBr:Eu2+ imaging plates were prepared in a polycrystalline form by cold pressing starting powders. These as-prepared materials show only small photostimulated luminescence intensity under thermal neutron irradiation, but the luminescence intensity can be increased by incorporating separate neutron converters, in the form of lithium, boron or gadolinium containing compounds. An imaging plate containing 5% 10B2O3 as a neutron converter has 50% the photostimulated luminescence intensity of a commercial Fuji neutron imaging plate. Thermal neutron imaging was shown to be possible with the CsBr:Eu2+-based imaging plates, and the differences in thermal neutron and X-ray images were clearly observed

  7. Pressure-induced structural changes in NH4Br.

    Science.gov (United States)

    Huang, Yanping; Huang, Xiaoli; Li, Wenbo; Wang, Lu; Wu, Gang; Zhao, Zhonglong; Duan, Defang; Bao, Kuo; Zhou, Qiang; Liu, Bingbing; Cui, Tian

    2015-08-14

    We report angle dispersive X-ray diffraction (XRD) measurements and Raman spectroscopy on NH4Br up to 70.0 GPa at room temperature. Three thermodynamically stable phases (phases II, IV, and V) are confirmed and a new possible phase (phase VI) of P21/m symmetry is proposed whose structure was established from Rietveld refinement of synchrotron XRD data for the first time. The phase sequence observed in NH4Br is in accordance with phase II → IV → V → VI. Phase V transforms into phase VI at about 57.8 GPa with a huge volume reduction of 30%. Still, the intramolecular distances are analyzed to better understand the nature of structures. The H-H interactions become markedly more important as the N-Br distances are compacted, which is probably the reason of the kink of symmetric stretching band (ν1) at the transition pressure. PMID:26277143

  8. Henkilöbrändäyksen mahdollisuudet kauneudenhoitoalalla

    OpenAIRE

    Gallotti, Mirva

    2015-01-01

    Henkilöbrändäys on vielä suhteellisen uusi termi ja ilmiö Suomessa. Kuitenkin parin viime vuoden aikana aihe on ollut entistä useammin esillä mediassa. Kiristynyt tilanne työmarkkinoilla on pakottanut ihmisiä löytämään tapoja, joilla voi erottautua massasta ja luoda positiivista kuvaa itsestä. Henkilöbrändäystä voidaan kutsua oman osaamisen ja asiantuntijuuden profiloinniksi. Tämän opinnäytetyön tarkoitus oli tutkia olisiko henkilöbrändäyksestä apua työllistymiseen ja uralla etenemiseen myös ...

  9. Raman spectra of ZnBr2-based glasses

    International Nuclear Information System (INIS)

    Raman spectra of ZnBr2-KBr and ZnBr2-KBr-CaBr2 glasses contain strong bands at 60 cm-1 and 155 or 174 cm-1 and some weak bands between 200-300 cm-1. From the compositional dependence of the spectra and comparison with vibrational modes of molten mixtures and crystals, the 155 and 174 cm-1 bands are assigned to symmetric stretching modes of tetrahedra consisting of four bridging and four non-bridging bromines, respectively. It is revealed that tetrahedra of bridging bromines exist in the glasses even at the composition of so large amount of bromine that the theoretical number of non-bridging bromine per zinc is beyond 4. (author) 6 refs., 4 figs

  10. New insight into halogen release from experimental studies on BrO/Br ratios in volcanic plumes

    Science.gov (United States)

    Bobrowski, Nicole; Wittmer, Julian; Liotta, Marcello; Calabrese, Sergio; Giuffrida, Giovanni; Brusca, Lorenzo; Platt, Ulrich

    2014-05-01

    Since the discovery of BrO in a volcanic plume (Bobrowski et al. 2003) many measurements have been performed as well as modelling to understand the radical chemistry in volcanic plumes, in particular, the interaction between volcanic gas species, released under strongly reduced conditions, and the oxidizing atmosphere. Besides the goal in atmospheric chemistry to better determine the impact of volcanic emission (e.g. reactive bromine) on the local (and maybe global) scale, volcanologists also have an interest to understand if the BrO/SO2 ratios can be used as a monitoring parameter giving further insides in dynamic processes of volcanoes. However, one of the arguments which potentially makes volcanological interpretations difficult is the reactivity of BrO. Therefore it is, of great importance to link the measurements of BrO and gaseous hydrogen bromide to the total emission flux of bromine in order to estimate the pristine gas composition released from magmas. In particular, trace gas composition of the surrounding atmosphere, the volcanic gas composition and meteorological parameters can all potentially effect the formation of BrO and might have to be considered. Some of these factors potentially also influence near source (crater rim) in-situ measurement. We need to answer the question: Can we correlate BrO measurements to the total bromine outgassing? Only with this knowledge we can relate changes of the measured gas ratios (BrO/SO2) to the volcanic fluids emitted by the underlying magma and can interpret data as signals from depth, which provide insight on the degassing of magmatic bodies inside the Earth. Some studies indicate that the BrO/SO2 ratio is close to a temporarily equilibrium already after only few minutes of the gas emission from the vent (e.g. Bobrowski and Giuffrida, 2012). This equilibrium seems to be relatively independent from meteorological parameters except for extreme conditions. We here present an empirical approach to answer the above

  11. PREFACE: International Conference on Dynamics of Systems on the Nanoscale (DySoN 2012)

    Science.gov (United States)

    Solov'yov, Andrey V.

    2013-06-01

    Conference logo The Second International Conference 'Dynamics of Systems on the Nanoscale' (DySoN 2012) took place in Saint Petersburg, Russia between 30 September and 4 October 2012. The venue was the Courtyard by Marriott St Petersburg Vasilievsky Hotel, 2nd line of Vasilievsky Island 61/30A, 199178. The conference was organized by the Frankfurt Institute for Advanced Studies - Goethe University, A F Ioffe Physical-Technical Institute and Saint Petersburg State Polytechnic University. This DySoN conference has been built upon a series of International Symposia 'Atomic Cluster Collisions: structure and dynamics from the nuclear to the biological scale' (ISACC 2003, ISACC 2007, ISACC 2008, ISACC 2009 and ISACC 2011). During these meetings it has become clear that there is a need for an interdisciplinary conference covering a broader range of topics than just atomic cluster collisions, related to the Dynamics of Systems on a Nanoscale. Therefore, in 2010 it was decided to launch a new conference series under the title 'Dynamics of Systems on the Nanoscale'. The first DySoN conference took place at the National Research Council, Rome, Italy in 2010. The DySoN 2012 is the second conference in this series. The DySoN 2012 Conference promoted the growth and exchange of interdisciplinary scientific information on the structure, formation and dynamics of animate and inanimate matter on the nanometer scale. There are many examples of complex many-body systems of micro- and nanometer scale size exhibiting unique features, properties and functions. These systems may have very different nature and origin, e.g. atomic and molecular clusters, nanoobjects, ensembles of nanoparticles, nanostructures, biomolecules, biomolecular and mesoscopic systems. A detailed understanding of the structure and dynamics of these systems on the nanometer scale is an important fundamental task, the solution of which is necessary in numerous applications of nano- and biotechnology, material science

  12. Magnetic Properties of the Dy1-xUxCo3 System

    Science.gov (United States)

    Lupşa, Ileana; Petrişor, T.; Balasz-Mureşan, I.

    The magnetic properties of Dy1-xUxCo3 system were investigated in the 4.3-1150 K temperature range and magnetic field up to 120 kOe. The crystalline structure is rhombohedral of PuNi3 type. For x≤0.8, the samples exhibit a ferrimagnetic behavior. The uranium substitution for dysprosium leads to the decreasing of the exchange field and the reducing of the magnetization and the transition temperatures. The Co mean moments (1.9μB/Co for x=0) opposite to the dysprosium ones and the mean effective Co moments (3.75μB/Co for x=0) are gradually decreasing as Dy is replaced by uranium.

  13. Effects of Treating with Laccase on Properties of Dyed Cotton Fabric

    Institute of Scientific and Technical Information of China (English)

    WANG Ping; FAN Xue-rong; CUI Li; WANG Qiang

    2008-01-01

    A laecase (Denilite IIS) was used to treat reactive dyes. The results indicated that the laecase could remove the loosely adhering, unfixed or hydrolyzed dyes from the dyed fabric efficiently, which led to obvious improvements of color fastness. Furthermore, the wavelength of maximum absorbanee of the residual solution of dyeing laccase-treated was different from that of the detergent-treated, which implied the laccase could accelerate structural changes of the adhering or hydrolyzed dyes from fabric in treating, resulting in obvious color changes of the residual solution. In addition, excessive iaccase also could decolorize a few fixed reactive dyes from the dyed fabric, with a decrease of color strength and less further improvements of color fastness.

  14. Decolorization and degradation of reactive dye during the dyed cotton fabric rinsing process.

    Science.gov (United States)

    Luo, Deng-Hong; Zheng, Qing-Kang; Chen, Sheng; Liu, Qing-Shu; Wang, Xiu-Xing; Guan, Yu; Pu, Zong-Yao

    2010-01-01

    Dyeing process of textile consumes large quantities of water, which results in huge amounts of colored wastewater. Most of the dye wastewater treating methods focused on the treatment of wastewater after the rinsing process of dyed textile. In this paper, tetraacetylethylenediamine/hydrogen peroxide (TAED/H₂O₂) active oxidation (AO) system was developed to rinse dyed textile and decolorize the rinsing wastewater simultaneously. The results indicated that the decolorization ratio of the rinse effluent obtained by AO method were in the range of 51.72%-84.15% according to different dyes and the COD value decreased more than 30% compared with that of traditional rinsing process. The decolorization kinetics investigation showed that the decolorization of dyes during AO rinsing process followed the law of pseudo-first order kinetics. The result of UV-Vis and UPLC-MS analysis demonstrated that the dye was degraded into colorless organic molecular fragments and partly mineralized during the AO rinsing process.

  15. Modeling the thermoluminescent response of CaSO{sub 4}:Dy by the MCNPX method

    Energy Technology Data Exchange (ETDEWEB)

    Furetta, C.; Roman, J. [Centro de Investigacion en Ciencia Aplicada y Tecnologia Avanzada, Legaria-IPN, Av. Legaria 694, Col. Irrigacion, Mexico D.F. 11500 (Mexico); Rivera, T. [Centro de Investigacion en Ciencia Aplicada y Tecnologia Avanzada, Legaria-IPN, Av. Legaria 694, Col. Irrigacion, Mexico D.F. 11500 (Mexico)], E-mail: trivera@ipn.mx; Azorin, J. [Universidad Autonoma Metropolitana-Iztapalapa, Av. San Rafael Atlixco 186, Col. Vicentina. 09340 Mexico D.F. (Mexico); Azorin, C.G. [Centro de Investigacion en Ciencia Aplicada y Tecnologia Avanzada, Legaria-IPN, Av. Legaria 694, Col. Irrigacion, Mexico D.F. 11500 (Mexico); Vega-Carrillo, H.R. [UaEN de la Universidad Autonoma de Zacatecas, Apdo. Postal 336, 98000 Zacatecas (Mexico)

    2010-04-15

    This work describes an algorithm for absorbed dose evaluation in the region of X-ray diagnostic energy based on the response of CaSO{sub 4}:Dy thermoluminescence powder detectors. The absorbed dose was calculated using Monte Carlo simulation code (MCSC) and then compared to the experimental TLD results for X-rays effective energies {sup 60}Co gamma radiation. In order to study the photon interaction in the matter, a cylindrical model of 1 cm{sup 3} was used. The gamma radiation source was placed at 100 cm to the object; the source is considered as an isotropic source of {sup 60}Co. The energy deposited into the cylindrical model was determined by the Monte Carlo N-particle (MCNPX) method. Measurements of the TL phosphors were obtained by irradiating the powder by gamma radiation. TL glow curve of CaSO{sub 4}:Dy after gamma irradiated at a 1 Gy of absorbed dose was then obtained.

  16. High-pressure synthesis of a La orthosilicate and Nd, Gd, and Dy disilicates

    CERN Document Server

    Liu Xiao Yang

    2002-01-01

    Several rare-earth silicates have been synthesized at 10 GPa and 1600-1700 deg. C: a La orthosilicate (La sub 4 Si sub 3 O sub 1 sub 2) with a defect Ba sub 3 (PO sub 4) sub 2 -type, a new structure type (K) for Nd and Gd disilicates (Nd sub 2 Si sub 2 O sub 7 and Gd sub 2 Si sub 2 O sub 7) with a diorthosilicate structure, and a new structure type (L) for Dy disilicate (Dy sub 2 Si sub 2 O sub 7) with a structure containing linear triple tetrahedral groups [Si sub 3 O sub 1 sub 0], but having one in six atoms distributed with 50% occupancy over two tetrahedral positions.

  17. High-pressure synthesis of a La orthosilicate and Nd, Gd, and Dy disilicates

    Energy Technology Data Exchange (ETDEWEB)

    Liu Xiaoyang; Fleet, Michael E [Department of Earth Sciences, University of Western Ontario, London, ON (Canada)

    2002-11-11

    Several rare-earth silicates have been synthesized at 10 GPa and 1600-1700 deg. C: a La orthosilicate (La{sub 4}Si{sub 3}O{sub 12}) with a defect Ba{sub 3}(PO{sub 4}){sub 2}-type, a new structure type (K) for Nd and Gd disilicates (Nd{sub 2}Si{sub 2}O{sub 7} and Gd{sub 2}Si{sub 2}O{sub 7}) with a diorthosilicate structure, and a new structure type (L) for Dy disilicate (Dy{sub 2}Si{sub 2}O{sub 7}) with a structure containing linear triple tetrahedral groups [Si{sub 3}O{sub 10}], but having one in six atoms distributed with 50% occupancy over two tetrahedral positions.

  18. Investigation on the magnetocaloric effect in RNi2 (R: Dy, tb) melt-spun ribbon

    Science.gov (United States)

    de Souza, M. V.

    2016-08-01

    We report a theoretical and experimental investigation on the magnetocaloric properties of the rare earth RNi2 (R=Dy,Tb) in melt-spun ribbon and bulk form. The theoretical calculations were performed using a Hamiltonian model including the Zeeman-exchange interactions and the crystalline electrical field. Thus the magnetocaloric potential was calculated in the easy magnetic axes, in order an average over all of the possible directions. The isothermal entropy-change dependence on temperature calculated was compared with available experimental data for melt-spun ribbon and bulk material. We also investigated, theoretically and experimentally, the behavior of a DyNi2 and TbNi2 composite with optimized molar proportions and discussed this in the context of the optimum regeneration Ericsson cycle.

  19. Chemically modulated multiferroicity in Dy-doped Gd2Ti2O7

    Science.gov (United States)

    Lin, L.; Zhao, Z. Y.; Liu, D.; Xie, Y. L.; Dong, S.; Yan, Z. B.; Liu, J.-M.

    2013-05-01

    The ferroelectricity and magnetoelectric coupling of Gd2Ti2O7 and Gd2-xDyxTi2O7 with Dy3+ substitution of Gd3+ are investigated. For Gd2Ti2O7, a ferroelectric polarization emerges at ˜30 K and is only ˜1.80 μC/m2 at 2 K, while the magnetoelectric response is quite weak. The Dy3+ substitution in Gd2-xDyxTi2O7, however, results in significant enhancement of polarization with remarkable magnetoelectric response up to 35% at 2 K under a magnetic field of 9 T, suggesting the multiferroicity of Gd2-xDyxTi2O7. It is understood that the chemical modulation of the multiferroicity is basically related to the extreme sensitivity of the spin-spin interactions in this highly frustrated system.

  20. 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.

  1. Deformed rotational cascades in {sup 152}Dy: Further evidence for shape coexistence at high spin

    Energy Technology Data Exchange (ETDEWEB)

    Smith, M. B. [Oliver Lodge Laboratory, University of Liverpool, Liverpool L69 7ZE, (United Kingdom); Department of Electronic Engineering and Physics, University of Paisley, Paisley PA1 2BE, (United Kingdom); Appelbe, D. E. [Oliver Lodge Laboratory, University of Liverpool, Liverpool L69 7ZE, (United Kingdom); Twin, P. J. [Oliver Lodge Laboratory, University of Liverpool, Liverpool L69 7ZE, (United Kingdom); Beausang, C. W. [Oliver Lodge Laboratory, University of Liverpool, Liverpool L69 7ZE, (United Kingdom); Wright Nuclear Structure Laboratory, Yale University, 272 Whitney Avenue, New Haven, Connecticut 06520 (United States); Beck, F. A. [Institut de Recherches Subatomiques, F-67037 Strasbourg Cedex 2, (France); Bentley, M. A. [School of Sciences, Staffordshire University, College Road, Stoke-on-Trent ST4 2DE, (United Kingdom); Cullen, D. M. [Oliver Lodge Laboratory, University of Liverpool, Liverpool L69 7ZE, (United Kingdom); Curien, D. [Institut de Recherches Subatomiques, F-67037 Strasbourg Cedex 2, (France); Dagnall, P. J. [Schuster Laboratory, University of Manchester, Manchester M13 9PL, (United Kingdom); De France, G. [Institut de Recherches Subatomiques, F-67037 Strasbourg Cedex 2, (France)] (and others)

    2000-03-01

    Two new rotational bands have been observed in the {sup 152}Dy nucleus following experiments performed using the EUROGAM {gamma}-ray spectrometer. Several transitions have been observed that link these new bands into the known single-particle states. Using the Doppler shift attenuation method, the quadrupole moment of the previously-known rotational sequence has been measured. The value of Q{sub band}=3.85{+-}0.06 e b confirms the deformed nature of this cascade. The structures of the three bands are discussed in terms of the occupation of both paired and unpaired orbitals, and are found to be in good agreement with theoretical calculations. The observation of two new bands further extends the concept of shape coexistence in the {sup 152}Dy nucleus. (c) 2000 The American Physical Society.

  2. DyNet: visualization and analysis of dynamic molecular interaction networks

    Science.gov (United States)

    Goenawan, Ivan H.; Lynn, David J.

    2016-01-01

    Summary: The ability to experimentally determine molecular interactions on an almost proteome-wide scale under different conditions is enabling researchers to move from static to dynamic network analysis, uncovering new insights into how interaction networks are physically rewired in response to different stimuli and in disease. Dynamic interaction data presents a special challenge in network biology. Here, we present DyNet, a Cytoscape application that provides a range of functionalities for the visualization, real-time synchronization and analysis of large multi-state dynamic molecular interaction networks enabling users to quickly identify and analyze the most ‘rewired’ nodes across many network states. Availability and Implementation: DyNet is available at the Cytoscape (3.2+) App Store (http://apps.cytoscape.org/apps/dynet). Contact: david.lynn@sahmri.com. Supplementary Information: Supplementary data are available at Bioinformatics online. PMID:27153624

  3. Dose Dependence of Mechanoluminescence Properties in MgAl2O4: Dy Phosphor

    Directory of Open Access Journals (Sweden)

    Kabita K. Satapathy

    2013-01-01

    Full Text Available A reliable dosimetry is fundamental for quality assurance of the processes and irradiation products. All dosimetric systems for high doses have some limitation with regard to their use. Dosimetric system should be easy to use, fast to measure, and of low cost. Good phosphor which shows high luminescence properties may fulfil the above criteria in some way. MgAl2O4: Dy phosphor has been prepared by solution combustion technique and confirmed with the help of XRD. ML has been excited impulsively by dropping a load of mass 0.7 kg onto the phosphors from various heights; two distinct ML peaks are observed for all the samples. It is observed that MgAl2O4: Dy phosphor shows linear response to gamma-ray dose and low fading which can be used for dosimetric purpose.

  4. Preparation of Dy-ferrite Ferrofluids and Magnetochemical Studies on the Superparamagnetism

    Institute of Scientific and Technical Information of China (English)

    HU,Xian-Luo(胡先罗); XU,Chao(徐超); SHEN,Qin(沈骎); CHEN,Yi-Wei(陈奕卫); ZHAO,Hong(赵泓); ZHU,Chuan-Zheng(朱传征)

    2001-01-01

    This paper reports unprecedented preparation of Dy-ferrite water-based ferrofiuids stabilized by polymeric surfactant PMAA. The stability of ferrofluids was characterized in terms of the equation of criterion for the stability of ferrofluids. Magnetic susceptibility was measured with a Faraday-type magnetic balance at different temperature and with different magnetic field intensity. According to the Langevin function,superparamagtism of Dy-ferrite ferrofiuids has been confirmed by the curves of saturation magnetization σ versus H/T, and the blocking temperature is between 160 and 200 K.In terms of the simplified Langevin function in the low magnefic field, the average particle size is 20 nm that coincides with the result evaluated by FHMW. In addition, chemical analysis, infi-ared spect-a and Mosslauer spectroscopy were utilized to analyze the main components of the ferrofiuids.

  5. 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

  6. Dy3Al5O12磁热性质研究∗%Study on the magnetic and magneto caloric effects of Dy3Al5O12

    Institute of Scientific and Technical Information of China (English)

    2015-01-01

    The crystal field (CF)- and external magnetic field- split ground state of Dy3+ in Dy3Al5O12 (DyAG) has been calculated based on the quantum theory in this paper. The eight CF-split levels are obtained, which are all twofold degenerates and are removed by the external magnetic field. On the basis of the results, the magnetic moments and the magnetic entropy changes of DyAG are calculated in the temperature range of 3 < T < 42 K and the magnetic field range of 0DyAG have contribution to the average magnetic moment and have an important impact on the magnetic anisotropy of the crystal. In addition, the study indicates that the exchange interaction between the magnetic ions in DyAG is so weak that it may be neglected. However, distinct from DyAG, the exchange interaction between the rare-earth ions in Gd3Ga5O12(GdGG) is stronger at low temperatures and dependent on the temperature and external magnetic field. Besides, the variation of the adiabatic temperature change ∆T with T is theoretically anticipated and the anticipated results are comparied with that of GdGG. It is found that the maximum adiabatic temperature change ∆T of DyAG is 1.27 times larger than that of GdGG when T = 11 K and H e = 1 T. However, it changes to 1.15 times that of GdGG when T =16 K and H e =2 T. There are differences between the refrigerative properties of DyAG and GdGG when they are in different external magnetic fields and different temperature regions. At low temperature s(T < 10 K), the DyAG is a good magnetic refrigerative material in the lower external magnetic field. However, When H e is higher, GdGG is a good selection. This study is helpful to select suitable materials for the magnetic refrigeration technology.

  7. Dalla pizza alla cura dell'uomo: le abilità di RoDyMan

    OpenAIRE

    Nunzia Bonifati; Bruno Siciliano

    2014-01-01

    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 eld...

  8. 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)

  9. Quasikristalle und verwandte Phasen im System Zn-Mg-SE (SE=Y, Er, Ho, Dy)

    OpenAIRE

    Sterzel, Roland

    2003-01-01

    Ziel dieser Arbeit ist die Herstellung und Charakterisierung von Zn-Mg-SE-Legierungen (SE = Y, Ho, Er, Dy, Tb, Gd), um Informationen über Struktur, Stabilisierung und physikalische Eigenschaften der quasikristallinen Phasen dieses Systems zu erhalten. Die Quasikristalle dieses Systems unterscheiden sich von Quasikristallen anderer Legierungen, die meist Al als Hauptkomponente enthalten. Es konnten bis zu 275 mm3 große Einkristalle der flächenzentriert ikosaedrischen Phase in den Systemen Zn-M...

  10. Crystal fields of dilute Tb, Dy, Ho, or Er in Lu obtained by magnetization measurements

    DEFF Research Database (Denmark)

    Touborg, P.; Høg, J.

    1975-01-01

    Magnetization measurements are reported on single crystals of dilute Tb, Dy, Ho, or Er in Lu. These measurements were performed in the temperature range 1.5-100 K and field range 0-6 T and include measurements of initial susceptibility, isothermal and isofield magnetization, and basal...... of the Y-R and Lu-R results makes possible an estimate of the crystal-field parameters in the pure-rare-earth metals....

  11. Spectral Analysis of Sm3+& Dy3+ : B2O3-Zno-Mgo Optical Glasses

    Directory of Open Access Journals (Sweden)

    M. Venkateswarlu

    2014-04-01

    Full Text Available The present paper reports on the spectral results pertaining to Sm3+ or Dy3+ (0.2 mol% ions doped B2O3-ZnO-MgO (BZM glasses. The amorphous nature of the reference glass (65B2O3-20ZnO-15MgO has been confirmed from its XRD measurement. Thermal analysis has been carried out for the precursor chemical mix and its weight loss has been noticed from the TG profile. Based on the DTA profile, the precursor chemicals mix transition temperature (Tg and crystallization temperature (Tc have been identified. The transformation of trigonal BO3 units into tetrahedral BO4 units has evidenced from the Fourier transform infrared (FTIR spectrum of reference glass without dopant ion(s. Spectral measurements of absorption, excitation, emission and emission transition lifetimes have been carried out for the Sm3+ and Dy3+ ions containing BZM glasses separately. These glasses exhibit strong intense absorption bands in the near-infrared (NIR region. The emission spectrum of Sm3+ : BZM glass shows a prominent and bright orange-red emission at 602 nm ( 4G5/2 6H7/2 upon excitation with λexci = 404 nm (6H5/24 F7/2. In the case of Dy3+: BZM glass, an appreciable blue emission at 485 nm (4 F9/26H15/2 has been identified with an excitation at λexci = 387 nm ( 6H15/24 I13/2. Energy level schemes relating to the emission mechanisms involved both in Sm3+ and Dy3+ glasses have also been explained. Decay curves are have been plotted in order to evaluate emission band lifetimes.

  12. Evol and ProDy for bridging protein sequence evolution and structural dynamics

    OpenAIRE

    Bakan, Ahmet; Dutta, Anindita; Mao, Wenzhi; Liu, Ying; Chennubhotla, Chakra; Lezon, Timothy R.; Bahar, Ivet

    2014-01-01

    Correlations between sequence evolution and structural dynamics are of utmost importance in understanding the molecular mechanisms of function and their evolution. We have integrated Evol, a new package for fast and efficient comparative analysis of evolutionary patterns and conformational dynamics, into ProDy, a computational toolbox designed for inferring protein dynamics from experimental and theoretical data. Using information-theoretic approaches, Evol coanalyzes conservation and coevolu...

  13. Peculiar features of infrared absorption in Gd, Tb and Dy single crystals

    International Nuclear Information System (INIS)

    Optical properties of Gd, Tb, Dy single crystals in 1-15 μm spectral range are studied. Plasma and relaxation frequencies of conduction electrons are determined along and perpendicular to crystal hexagonal axis. Essential dependence of reflexion and permittivity, on radiation polarization is detected. Data on kinetic characteristics of current carriers are analysed taking into account structure and peculiar featues of Fermi surface of the investigated metals

  14. Optical and luminescence properties of Dy3+ ions in phosphate based glasses

    Science.gov (United States)

    Rasool, Sk. Nayab; Rama Moorthy, L.; Jayasankar, C. K.

    2013-08-01

    Phosphate glasses with compositions of 44P2O5 + 17K2O + 9Al2O3 + (30 - x)CaF2 + xDy2O3 (x = 0.05, 0.1, 0.5, 1.0, 2.0, 3.0 and 4.0 mol %) were prepared and characterized by X-ray diffraction (XRD), differential thermal analysis (DTA), Fourier transform infrared (FTIR), optical absorption, emission and decay measurements. The observed absorption bands were analyzed by using the free-ion Hamiltonian (HFI) model. The Judd-Ofelt (JO) analysis has been performed and the intensity parameters (Ωλ, λ = 2, 4, 6) were evaluated in order to predict the radiative properties of the excited states. From the emission spectra, the effective band widths (Δλeff), stimulated emission cross-sections (σ(λp)), yellow to blue (Y/B) intensity ratios and chromaticity color coordinates (x, y) have been determined. The fluorescence decays from the 4F9/2 level of Dy3+ ions were measured by monitoring the intense 4F9/2 → 6H15/2 transition (486 nm). The experimental lifetimes (τexp) are found to decrease with the increase of Dy3+ ions concentration due to the quenching process. The decay curves are perfectly single exponential at lower concentrations and gradually changes to non-exponential for higher concentrations. The non-exponential decay curves are well fitted to the Inokuti-Hirayama (IH) model for S = 6, which indicates that the energy transfer between the donor and acceptor is of dipole-dipole type. The systematic analysis of revealed that the energy transfer mechanism strongly depends on Dy3+ ions concentration and the host glass composition.

  15. Elimination of Myostatin Does Not Combat Muscular Dystrophy in dy Mice but Increases Postnatal Lethality

    OpenAIRE

    Li, Zhi-fang; Shelton, G Diane; Engvall, Eva

    2005-01-01

    Myostatin is a TGF-β family member and a negative regulator of skeletal muscle growth. It has been proposed that reduction or elimination of myostatin could be a treatment for degenerative muscle diseases such as muscular dystrophy. Laminin-deficient congenital muscular dystrophy is one of the most severe forms of muscular dystrophy. To test the possibility of ameliorating the dystrophic phenotype in laminin deficiency by eliminating myostatin, we crossed dyW laminin α2-deficient and myostati...

  16. Crystal growth of large size Dy3Al5O12 garnet single crystals

    Science.gov (United States)

    Kimura, Hideo; Sakamoto, Masaru; Numazawa, Takenori; Sato, Mitsunori; Maeda, Hiroshi

    1990-01-01

    Crystal growth conditions using the Czochralski technique were examined in order to be able to grow large-size disprosium-aluminum-garnet single crystals; these are useful as a working material in a practical magnetic refrigeration system. Using the best conditions, large-size bubble-free Dy3Al5O12 single crystals 50 mm in diameter were grown from a stoichiometric melt composition using a seed of Y3Al5O12 single crystal.

  17. Brändistrategian merkitys yrityksen digitaalisessa markkinoinnissa

    OpenAIRE

    Niskala, Harri

    2011-01-01

    Tämä tutkielma on kirjoitettu siksi, että olen aikaisemmin työskennellyt digitaalista markkinointia myyvän yrityksen palveluksessa. Kyseinen työnantaja, Advertising Media Finland Oy, on ollut tämän tutkielman toimeksiantaja. Työn tavoitteena oli selvittää, kuinka suuri merkitys brändistrategialla on suomalaisissa yrityksissä. Lisäksi pyrittiin selvittämään, mikä on suomalaisten yritysten brändi-identiteetin ja imagon merkitys digitaalisessa markkinoinissa. Näiden kahden asian lisäksi selvitet...

  18. Intramolecular and dissociation dynamics of the CF2Br radical

    Science.gov (United States)

    Bintz, Karen L.; Thompson, Donald L.; Gosnell, T. R.; Hay, P. Jeffrey

    1992-11-01

    Classical trajectory methods were used to investigate the nature of the intramolecular dynamics (quasiperiodic vs chaotic) of the CF2Br radical. The potential energy surface is based on empirical and ab initio results. Power spectra show that the Br-C-F bend exhibits quasiperiodic dynamics while the other modes are chaotic. Despite the presence of quasiperiodic dynamics, the dissociation rates for mode-specific excitations of the normal modes are essentially the same as those for equipartitioning of the excitation energy among all the normal modes.

  19. 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)

  20. Microcalorimetric Studies on Influence of Sm3+, Dy3+ on Growth and Sporulation of Bacillus thuringiensis

    Institute of Scientific and Technical Information of China (English)

    赵儒铭; 刘义; 杨昌英; 谢志雄; 沈萍; 屈松生

    2004-01-01

    By using an LKB-2277 Bioactivity Monitor and cycle-flow method, the thermogenic curves of aerobic growth for Bacillus thuringiensis cry Ⅱ strain at 28 ℃ have been obtained. The metabolic thermogenic curves of Bt cry Ⅱ contain two distinct parts: the first part reflects the changes of bacterial growth phase and the second part corresponds to sporulation phase. From these thermogenic curves in the absence or presence of Sm3+, Dy3+ ions, the thermokinetic parameters such as the growth rate constants k, the interval time τI, the maximum power PMAxl and heat-output QLoG for log phase, the maximum power PMAX2 and heat-output QSTAT for stationary phase, the heat-output QSPOR for sporulation phase and total heat effects QT were calculated. Sm3+ and Dy3+ ions have promoting action on the growth of Bt cry Ⅱ in their lower concentration range, on the other hand, they have inhibitory action on the sporulation of Bt in their higher concentration range. It has also been found that the effects of Sm3+ and Dy3+ ions on Bt during the sporulation phase were far greater than those during the bacterial growth phase. It was concluded that the application of Bt for controlling insecticide could not be affected by the presence of the rare-earth elements in the environmental ecosystem.

  1. Magnetocaloric properties of rare-earth substituted DyCrO{sub 3}

    Energy Technology Data Exchange (ETDEWEB)

    McDannald, A. [Material Science and Engineering Department, University of Connecticut, Storrs, Connecticut 06269 (United States); Jain, M., E-mail: menka.jain@uconn.edu [Institute of Material Science, University of Connecticut, Storrs, Connecticut 06269 (United States); Department of Physics, University of Connecticut, Storrs, Connecticut 06269 (United States)

    2015-07-28

    Recently, there has been a focus on the need for efficient refrigeration technology without the use of expensive or harmful working fluids, especially at temperatures below 30 K. Solid state refrigeration, based on the magnetocaloric effect, provides a possible solution to this problem. The rare-earth chromites (RCrO{sub 3}), especially DyCrO{sub 3}, with its large magnetic moment dysprosium ion, are potential candidates for such an application. The Dy{sup 3+} ordering transition at low temperatures (<10 K) likely causes a large magnetocaloric response in this material. This study investigates the possibility of tuning the magnetocaloric properties through the use of rare-earth substitution. Both Y{sup 3+} and Ho{sup 3+} substitutions were found to decrease the magnetocaloric response by disrupting the R{sup 3+} ordering. Whereas Er{sup 3+} substitution was found to increase the magnetocaloric response, likely due to an increase in the R{sup 3+} ordering temperature. The large magnetocaloric entropy change of Er{sup 3+} substituted DyCrO{sub 3} (10.92 J/kg K with a relative cooling power of 237 J/kg at 40 kOe and 5 K) indicates that this material system is well suited for low temperature (<30 K) solid state refrigeration applications.

  2. Generation of white-light from Dy3+ doped Sr2SiO4 phosphor

    International Nuclear Information System (INIS)

    A single host lattice white light emitting Sr2SiO4:Dy3+ powder phosphor was synthesized by solid state reaction process using a temperature of 1000 °C. The structure, particle morphology, chemical composition and oxidation states, photoluminescence (PL) and decay properties of the phosphor were analyzed using X-ray diffraction (XRD), scanning electron microscopy (SEM), X-ray photoelectron spectroscopy and PL spectroscopy, respectively. The objective of this study was to prepare a phosphor that can be used in white light emitting diodes. The XRD patterns showed a monoclinic structure of Sr2SiO4 with minor incidental secondary phases from unreacted precursors. An agglomeration of particles with irregular shapes was observed from the SEM micrographs. The PL emission spectra of the Sr2SiO4:Dy3+ phosphor excited at 350 nm consist of blue, yellow and red line emissions at 486 nm, 575 nm and 668 nm corresponding respectively to the (4F9/2→6H15/2), (4F9/2→6H13/2) and (4F9/2→6H11/2) transitions of Dy3+. The combination of these emissions constituted white light as indicated on the Commission Internationale de L'Eclairage chromatic coordinate diagram. The decay characteristics show that the phosphor consists of a single exponential decay process.

  3. Spontaneous magnetostriction of Dy2AlFe13Mn3 compound

    Institute of Scientific and Technical Information of China (English)

    Hao Yan-Ming; Zhou Yan; Zhao Miao

    2005-01-01

    The structural and magnetic properties of Dy2AlFe13Mn3 compound have been investigated by means of x-ray diffraction and magnetization measurements. The Dy2AlFe13Mn3 compound has a hexagonal Th2Ni17-type structure.Negative thermal expansion is found in the Dy2AlFe13Mn3 compound at the temperatures ranging from 245 to 344Kby x-ray dilatometry. The coefficient of the average thermal expansion is -α = -1.1 × 10-4K-1. The spontaneous magnetostrictive defcrmations in the 105-360K temperature range have been calculated by means of the differences between the experimental values of the lattice parameters and the corresponding values extrapolated from the paramagnetic range. The result shows that the spontaneous volume magnetostrictive deformation ωs increases from 7.0 × 10-3at 105K to 9.1×10-3 at 245K, and then decreases with the temperature increasing. The spontaneous linear magnetostrictive deformation λc along the c axis decreases as temperature increases. The spontaneous linear magnetostrictive deformation λα in basal-plane increases from 0.8×10-3 at 105K to 3.4×10-3 at 270K, and then decreases with the temperature increasing further.

  4. Spontaneous volume magnetostriction of Dy2AlFe12Mn4 compound

    Institute of Scientific and Technical Information of China (English)

    2006-01-01

    The structure and magnetic properties of Dy2AlFe12Mn4 compound have been investigated by means of X-ray diffraction and magnetization measurements. The Dy2AlFe12Mn4 compound has a hexagonal Th2Ni17-type structure. Negative thermal expansion was found in Dy2AlFe12Mn4 compound from 229 to 280 K by X-ray dilatometry. The coefficient of the average thermal expansion is (-α) = -3.8×10-5 K-1. The magnetostrictive deformations from 105 to 270 K have been calculated by means of the differences between the experimental values of the lattice parameters and the corresponding values extrapolated from the paramagnetic range. The result shows that the spontaneous volume magnetostrictive deformation ωs decreases from 6.2 × 10-3 to near zero with the temperature increasing from 105 to 270 K, the spontaneous linear magnetostrictive deformation λc along the c axis is much larger than the spontaneous linear magnetostrictive deformation λa in basal-plane at the same temperature except close to 249 K.

  5. Shedding light on the single-molecule magnet behavior of mononuclear Dy(III) complexes.

    Science.gov (United States)

    Aravena, Daniel; Ruiz, Eliseo

    2013-12-01

    General requirements for obtaining Dy(III) single-molecule magnets (SMM) were studied by CASSCF+RASSI calculations on both real and model systems. A set of 20 Dy(III) complexes was considered using their X-ray crystal structure for our calculations. Theoretical results were compared with their experimental slow relaxation data, and general conclusions about the calculated key parameters related with SMM behavior are presented. The effect of the coordination geometry and nature of ligands is discussed based on calculations on real and model systems. We found two different patterns to exhibit SMM behavior: the first one leads to the largest axial anisotropy in complexes showing heterolepticity of the ligand environment (more important than symmetric requirements), while the second one corresponds to sandwich-shaped complexes with a smaller anisotropy. Thus, most existing mononuclear zero-field SMMs adopting a heteroleptic coordination mode mixing neutral and anionic ligands present the same pattern in the electrostatic potential induced by their ligands, with a lower potential island related to the presence of neutral ligands inside a high potential background related with anionic groups. The existence of different electrostatic regions caused by the ligands induces a preferential orientation to reduce the electron repulsion for the electron density of the Dy(III) cations, resulting in the magnetic anisotropy. PMID:24237385

  6. Magnetocaloric Effect and Critical Behavior in Fe-Dy-Zr Rapidly Quenched Alloys

    Science.gov (United States)

    Dan, Nguyen Huy; Yen, Nguyen Hai; Thanh, Pham Thi

    2016-10-01

    In this paper, we present our study results for Fe90- x Dy x Zr10 ( x = 1-6) alloy ribbons with thickness of about 15 µm prepared by using a melt-spinning technique. Structure and magnetic properties of the ribbons were investigated by using x-ray diffraction analysis and magnetization measurements, respectively. The results show that the alloy is almost amorphous with x = 1, but partly crystalline with x ≥ 2, i.e. the glass forming ability (GFA) of the alloy is reduced with an increase of the Dy-concentration. Curie temperature, T C, of the alloy is considerably increased, from 273 K (for x = 1) to 305 K (for x = 3), by increasing the Dy-concentration. Maximum magnetic entropy change, |∆S m|max, of the alloys with x = 1 and 2 was respectively determined to be 0.84 and 0.93 J kg-1 K-1 with magnetic field change ΔH = 12 kOe. High refrigerant capacity (RC > 80 J kg-1) at room temperature region has been obtained for the alloy revealing its possibility for practical application in magnetic refrigeration. Critical analyses around the ferromagnetic-paramagnetic phase transitions, by using the Arrott-Noakes method, indicate long-range ferromagnetic orders in the alloys.

  7. Thermoluminescence Response of Gamma Irradiated SrAl2O4:Eu2+/Dy3+ Nanophosphor

    Science.gov (United States)

    Bedyal, A. K.; Kumar, Vinay; Lochab, S. P.; Singh, Fouran; Ntwaeaborwa, O. M.; Swart, H. C.

    In this paper, we report on the thermoluminescence response of nanocrystalline co-doped alkaline earth aluminates synthesized by combustion method using metal nitrate as precursor and urea as fuel. A broad TL glow peak was observed at 367 K with a shoulder at 400K. TL Anal program has been used for GCD curve fitting. The Kinetic parameters like, the activation energy (Eα), the frequency factor (s) and the order of kinetics were calculated for the SrAl2O4: Eu2+, Dy3+nanophosphors. The best dopants combination was Eu (1 mol%) and Dy (2 mol%). The samples were irradiated with γ-dose in the range 20Gy-800Gy, at room temperature. A shift from 367 K to 376 K was also observed in the main peak with an increase in irradiation dose which suggest that the irradiation doses affect the distributions of traps produced by the gamma-ray irradiations. Kinetic parameters also suggest that TL glow curve in SrAl2O4: Eu2+, Dy3+ nanophosphors is obeying second order kinetics. The nanophosphors show linear response with dose.

  8. Interaction between ring permanent magnets and bulk Dy-Ba-Cu-O superconductors

    Energy Technology Data Exchange (ETDEWEB)

    Kurabayashi, H., E-mail: m208501@sic.shibaura-it.ac.j [Superconducting Materials Laboratory, Shibaura Institute of Technology, 3-7-5, Toyosu, Koto-Ku, Tokyo 135-8548 (Japan); Horikoshi, S.; Suzuki, A.; Ikeda, M.; Wongsatanawarid, A.; Seki, H. [Superconducting Materials Laboratory, Shibaura Institute of Technology, 3-7-5, Toyosu, Koto-Ku, Tokyo 135-8548 (Japan); Akiyama, S. [Magneo-Giken, 1-4-23, Suwa, Iwatsuki-Ku, Saitama-Shi, Saitama-Ken (Japan); Hiragushi, M. [SEIKOW Chemical Engineering, 4-1-31, Suidou-Cho, Amagasaki-Shi, Hyougo-Ken (Japan); Murakami, M. [Superconducting Materials Laboratory, Shibaura Institute of Technology, 3-7-5, Toyosu, Koto-Ku, Tokyo 135-8548 (Japan)

    2010-11-01

    A combination of bulk Dy-Ba-Cu-O superconductors and permanent magnets can be used for various rotational applications such as flywheel energy storage and magnetic bearings. For practical applications, there are two important parameters: the levitation force and the stiffness. Since the superconductor and magnets are installed in a closed space, the attractive force is another important parameter that we should take care. In this study, we measured the levitation force and the stiffness by changing the thickness of a ring permanent magnet. We used ring Fe-Nd-B magnets 120 mm in outer diameter and 70 mm in inner diameter with the thicknesses of 5-40 mm. For superconductors, we used single-domain bulk Dy-Ba-Cu-O 47 mm in diameter and 10 mm in thickness. Six pellets of Dy-Ba-Cu-O were placed concentrically such that the inner diameter becomes 70 mm. The levitation forces increased with increasing the thickness of the permanent magnet but tended to saturate.

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

    International Nuclear Information System (INIS)

    Many studies of thin-film CdS/CdTe photovoltaic devices have suggested that performance may be improved by reducing recombination due to Te-vacancy (VTe), Te antisite (TeCd), or Te-interstitial (Tei) 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 (VCd) 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 VTe without significantly reducing VCd. Initial results show that when this modified contact is used on a CdCl2-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 CuxTe 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 VTe (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

  10. Electronic structure and band alignments of ZnTe/CrTe(0 0 1), CdSe/CrTe(0 0 1) and CdTe/CrTe(0 0 1) interfaces

    Indian Academy of Sciences (India)

    F Ahmadian; R Zare

    2011-08-01

    All-electron full potential calculations based on spin density functional theory were performed to study cubic zincblende (ZB) and hexagonal NiAs structures of bulk CrTe and ZnTe/CrTe(0 0 1), CdTe/CrTe(0 0 1) and CdSe/CrTe(0 0 1) interfaces. The lattice mismatch effect in ZB CrTe and magnetic properties of CrTe in the ideal ZB CrTe structure were investigated. The band alignment properties of the ZnTe/CrTe(0 0 1), CdTe/CrTe(0 0 1) and CdSe/CrTe(0 0 1) interfaces were computed and a rather large minority valence band offset of about 1.09 eV was observed in ZnTe/CrTe(0 0 1) heterojunction. Also in the CdTe/CrTe(0 0 1) and CdSe/CrTe(0 0 1) interfaces, the conduction band minimum of minority spin in CrTe was above the conduction band minimum of CdTe and CdSe and so the majority spin electrons could be directly injected to both semiconductors, indicating the possibility of highly efficient spin injection into the CdSe and CdTe semiconductors.

  11. Transport properties of BiTe-SbTe superlattices

    Energy Technology Data Exchange (ETDEWEB)

    Yavorsky, Bogdan; Hinsche, Nicki; Zahn, Peter [Institut fuer Physik, Martin-Luther Universitaet Halle-Wittenberg, D-06120 Halle (Germany); Gradhand, Martin [Max-Plank-Institut fuer Mikrostrukturphysik, D-06099 Halle (Germany); Czerner, Michael [I. Physikalisches Institut, AG Theorie, Justus-Liebig University Giessen, D-35392 Giessen (Germany); Mertig, Ingrid [Institut fuer Physik, Martin-Luther Universitaet Halle-Wittenberg, D-06120 Halle (Germany); Max-Plank-Institut fuer Mikrostrukturphysik, D-06099 Halle (Germany)

    2011-07-01

    During the last decade BiTe-SbTe multilayers attracted much attention due to their enhanced thermoelectric figure of merit compared to the bulk materials. To shed light on the origin of this enhancement, we studied the electronic structure of (Bi{sub 2}Te{sub 3}){sub x}(Sb{sub 2}Te{sub 3}){sub N-x} superlattices with a fully relativistic screened Korringa-Kohn-Rostoker Green's function method. The electrical conductivity was calculated within the relaxation time approximation of the Boltzmann theory. The effect of composition (x) on the transport near the Fermi energy and the consequences for the thermoelectric properties were studied in detail.

  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. Phase diagram of R-Fe-Co pseudoternary system with R≤33.3 %(mole fraction, R=Sm0.5Dy0.5)

    Institute of Scientific and Technical Information of China (English)

    王博文; 刘炜丽; 封文江; 金光; 郝延明; 李养贤

    2002-01-01

    Phase equilibria of the R-Fe-Co pseudoternary system with R≤33.3%(mole fraction, R=Sm0.5Dy0.5) were determined in an isothermal section at 1073K and a vertical section of RFe2-RCo2 by using OM, X-ray diffractometer, EPMA DTA techniques. There are seven intermetallic phases: (Sm, Dy)(Fe, Co)2, (Sm, Dy)(Fe, Co)3, (Sm, Dy)6(Fe, Co)23, (Sm, Dy)2(Fe, Co)7, (Sm, Dy)(Fe, Co)5, Th2Ni17-type and Th2Zn17-type (Sm, Dy)2(Fe, Co)17. The (Sm, Dy)6(Fe, Co)23 phase dissolves 36% Co(mole fraction) at 1073K. However, the (Sm, Dy)2(Fe, Co)7 phase in R2(Fe1-xCox)7 alloys dissolves about 19% Fe(mole fraction) at 1073K.

  14. 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.

  15. Phase Transformation and Magnetostriction of (R-Pr)(Fe-T)2 (R=Dy, Tb; T=Co, Ni)

    Institute of Scientific and Technical Information of China (English)

    2000-01-01

    Structure and magnetostriction of Dy1-xPrxFe2 (0 ≤x≤0.5), Dy0.6Pr0.4(Fe1-yTy)2 (0<y<0.6), and Tb1-zPrz(Fe0.4Co0.6)2 (0≤z≤1.0) alloys (T=Co, Ni) have been investigated. It is found that the matrix of the alloys Dy1-xPrxFe2 is a single phase (Dy, Pr)Fe2 with MgCu2-type structure and the second phase is (Dy, Pr)Fe3 when x≤0.2. The amount of (Dy, Pr)Fe3 phase increases with increasing Pr content and becomes the main phase when x=0.4. The matrix of Dy1-xPrxFe2 is found to be the (Dy, Pr)2Fe17 phase with Th2Zn17-type structure when x=0.5. It is found that the amount of the cubic Laves phase (Dy, Pr)(Fe, Co)2 in the Dy0.6Pr0.4(Fe1-yCoy)2 increases with increasing Co concentration when 0≤y≤0.6. The substi tution of Ni for Fe is nearly not favorable for the formation of the cubic Laves phase (Dy, Pr)(Fe, Ni)2 in (Dy1-xPrx)Fe2. The matrix of (Tbl-zPrz)(Fe0.4Co0.6)2 is a (Tb, Pr)(Fe, Co)2 phase with the MgCu2-type cubic Laves structure and a second phase of small amount is (Tb, Pr)(Fe, Co)3 phase when z≤0.2, z=0.5 and 1.0. When 0.2<z≤0.4, the amount of the (Tb, Pr)(Fe, Co)3 phase with PuNi3-type structure increases with increasing z and becomes the main phase when z=0.4. When 0.5<z≤0.6 the amount of the (Tb, Pr)(Fe, Co)3 phase increases sharply, whereas for 0.6<z≤0.8 it decreases with increasing z. The polycrystalline magnetostriction, λ‖ - λ┴, at room temperature of Dy1-xPrxFe2 exhibits a peak when x=0.3. The λ‖ - λ for Dy0.6Pr0.4(Fel-yMy)2 (M=Co, Ni) and Tb1-zPrz(Fe0.4Co0.6)2 is also examined.

  16. 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

  17. Conductivity anisotropy of layered BiTe-SbTe-heterostructures

    International Nuclear Information System (INIS)

    Transport properties of ordered bismuth and antimony tellurides are studied theoretically based on first-principle electronic structure calculations using a screened Korringa-Kohn-Rostoker Greens function method. The anisotropy of the electron mobility both in the bulk materials and in layered BiTe-SbTe-heterostructures is analyzed within the relaxation time approximation of the Boltzmann theory. The influence of doping on the electrical conductivity is discussed applying the rigid band approximation.

  18. Conductivity anisotropy of layered BiTe-SbTe-heterostructures

    Energy Technology Data Exchange (ETDEWEB)

    Yavorsky, Bogdan; Hinsche, Nicki; Zahn, Peter [Martin-Luther-Universitaet Halle-Wittenberg, Institut fuer Physik, Halle (Germany); Gradhand, Martin; Mertig, Ingrid [Martin-Luther-Universitaet Halle-Wittenberg, Institut fuer Physik, Halle (Germany); MPI fuer Mikrostrukturphysik, Halle (Germany)

    2010-07-01

    Transport properties of ordered bismuth and antimony tellurides are studied theoretically based on first-principle electronic structure calculations using a screened Korringa-Kohn-Rostoker Greens function method. The anisotropy of the electron mobility both in the bulk materials and in layered BiTe-SbTe-heterostructures is analyzed within the relaxation time approximation of the Boltzmann theory. The influence of doping on the electrical conductivity is discussed applying the rigid band approximation.

  19. ZnTe/CdTe thin-film heterojunctions

    Directory of Open Access Journals (Sweden)

    M.M. Kolesnyk

    2009-01-01

    Full Text Available 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 mechanism in heterojunction.

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

    International Nuclear Information System (INIS)

    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 m2 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/m2 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 25 is

  1. Large BR(h -> tau mu) in Supersymmetric Models

    CERN Document Server

    Hammad, Ahmed; Un, Cem Salih

    2016-01-01

    We analyze the Lepton Flavor Violating (LFV) Higgs decay h -> tau mu in three supersymmetric models: Minimal Supersymmetric Standard Model (MSSM), Supersymmetric Seesaw Model (SSM), and Supersymmetric B-L model with Inverse Seesaw (BLSSM-IS). We show that in generic MSSM, with non-universal slepton masses and/or trilinear couplings, it is not possible to enhance BR(h -> tau mu) without violating the experimental bound on the BR(tau -> mu gamma). In SSM, where flavor mixing is radiatively generated, the LFV process mu -> e gamma strictly constrains the parameter space and the maximum value of BR(h -> tau mu) is of order 10^-10, which is extremely smaller than the recent results reported by the CMS and ATLAS experiments. In BLSSM-IS, with universal soft SUSY breaking terms at the grand unified scale, we emphasize that the measured values of BR(h -> tau mu) can be accommodated in a wide region of parameter space without violating LFV constraints. Thus, confirming the LFV Higgs decay results will be a clear signa...

  2. Infections fongiques des brûlé : revue

    Science.gov (United States)

    Arnould, JF.; Le Floch, R.

    2015-01-01

    Summary Les infections fongiques locales ou générales sont souvent d’une extrême gravité chez les brûlés. Les brûlés combinent de nombreux facteurs de risque à une immunodépression induite par la brûlure. Les infections de plaies sont le fait des genres Candida, Aspergillus et des agents de mucormycoses. Ces deux derniers cas sont à l’origine de lésions particulièrement sévères. Leur diagnostic repose sur la biopsie cutanée avec examens mycologique et anatomopathologique. Le traitement est essentiellement chirurgical, associé à une antibiothérapie adaptée. Les septicémies sont le fait de levures, essentiellement du genre Candida. Le diagnostic en est difficile dans le contexte des brûlés et repose souvent sur une forte suspicion clinique. Leur traitement repose sur les échinocandines et plus secondairement sur le fluconazole. PMID:26668558

  3. Bellahøj. Ballerup. Brøndby Strand

    DEFF Research Database (Denmark)

    Bertelsen, S.

    det der skete? Hvem tog initiativet? Hvorfor lykkedes det med så stor succes, som det faktisk gjorde? Hvilke tanker, idealer og indgreb var udgangspunkt for den store indsats? På grundlag af disse spørgsmål har Sven Bertelsen i "Bellahøj - Ballerup - Brøndby Strand" skildret en væsentlig epoke i dansk...

  4. 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.

  5. Li doping effect on the photoluminescence behaviors of KSrPO4:Dy3+ phosphors for WLED light

    International Nuclear Information System (INIS)

    Highlights: • The luminescence intensity of KSrPO4:Dy3+ can be increased with Li+ ions co-doping. • The mechanisms for the emitting enhancement with Li+ ions co-doping were investigated. • The thermal stability demonstrated that KSrPO4:0.01Dy3+, 0.06Li+ is suitable for WLEDs. • The chromaticity coordinates of KSrPO4:Dy3+, Li+ can be tuned with Li+ ions increasing. - Abstract: A novel warm-white phosphor KSrPO4 co-doped with Dy3+ and Li+ ions was prepared by solid state reaction. A strategy of Li+ doping was used with the aim of enhancing the luminescence of 475 nm and 570 nm emission bands under NUV excitation. Compared to lithium-free KSrPO4:Dy3+, the intensities of the 570 nm emission peaks were increased by 4.32 times and 2.84 times excited by 351 nm and 388 nm with 6 mol% Li+ ions co-doping, respectively. The mechanism of the enhancement was discussed, that is due to the improvement of the phosphors’ crystallinity and charge compensation when the Li+ ions were introduced. Furthermore, the thermal stability of KSrPO4:0.01Dy3+, 0.06Li+ was measured and discussed, demonstrating it can be applied for high-powered LED. And the chromaticity coordinates of KSrPO4:0.01Dy3+, xLi+ can be tuned efficiently from the cold-white region to warm-white region with Li+ ions increasing, presenting its potential applied value as a new warm-white LED phosphor

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

    International Nuclear Information System (INIS)

    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

  7. Structural, electrical, magnetic and {sup 57}Fe Mössbauer study of polycrystalline multiferroic DyFeO{sub 3}

    Energy Technology Data Exchange (ETDEWEB)

    Reddy, S. Shravan Kumar; Raju, N. [Department of Physics, Osmania University, Hyderabad 500007, Telangana (India); Reddy, Ch. Gopal, E-mail: ch_gopalreddy@yahoo.com [Department of Physics, University College of Engineering, Osmania University, Hyderabad 500007, Telangana (India); Reddy, P. Yadagiri; Reddy, K. Rama [Department of Physics, Osmania University, Hyderabad 500007, Telangana (India); Reddy, V. Raghavendra [UGC DAE Consortium for Scientific Research, University campus, Khandwa Road, Indore, Madhya Pradesh 452001 (India)

    2015-12-15

    Structural, Raman spectroscopy, leakage current density, temperature dependent magnetization and Mössbauer measurements of polycrystalline DyFeO{sub 3} (DFO) prepared through sol–gel route are reported in this paper. Phase purity and structure of the prepared sample is confirmed from x-ray diffraction and Raman spectroscopy measurements. The room temperature leakage current density (J–E) measurements indicate that Ohmic contribution and space charge limited conduction are the dominating mechanisms at low and high applied electric fields respectively. Signatures of Fe{sup 3+} spin reorientation transition (T{sub SR}) and the antiferromagnetic ordering of Dy{sup 3+} ions are observed from the temperature dependent (10–350 K) magnetization data. The M–H data measured at 2 K shows the field induced metamagnetic transition. Internal hyperfine field obtained from temperature dependent (5–300 K) {sup 57}Fe Mössbauer measurements is observed to decrease below the T{sub SR} and further found to increase till 5 K indicating the contribution of Dy{sup 3+} magnetic ordering on the hyperfine field of Fe nucleus. - Highlights: • This paper analyses structural, electrical and magnetic properties of polycrystalline multiferroic DyFeO{sub 3} sample prepared through sol–gel route. • Signatures of Fe{sup 3+} spin reorientation transition and the antiferromagnetic ordering of Dy{sup 3+} ions are observed from the temperature dependent (10-350 K) magnetization data. • From the temperature dependent {sup 57}Fe Mössbauer measurements contribution of Dy{sup 3+} magnetic ordering on the hyperfine field of Fe nucleus is observed. • Ohmic and space charge limited conduction mechanisms are found to be dominating at low and high applied electric fields respectively in DyFeO{sub 3}.

  8. 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.

  9. Ab initio calculation of the growth of Te nanorods and Bi2Te3 nanoplatelets

    Institute of Scientific and Technical Information of China (English)

    Tian Xiao-Qing; Du Shi-Xuan; Gao Hong-Jun

    2008-01-01

    In this paper the growth mechanism of a Te/Bi2Te3 novel structure is studied by ab-initio calculations.The results show that the growth of Te nanorods is determined by the adsorption energy of Te atoms on different crystalline Te surfaces.The adsorption energy of Te on the Te (001) surface is 3.29 eV,which is about 0.25 eV higher than that of Te on the Te (110).This energy difference makes the preferential growth direction along the < 001> direction.In addition,the higher surface energy of Bi2Te3 (110) and the lattice misfit between crystalline Bi2Te3 and Te along < 001> direction are considered to explain the growth of the Bi2Te3 nanoplatelets,in which Volmer-Weber model is used.The theoretical results axe in agreement with experimental observation.

  10. Influence of y3+, Bi3+ Content on Photoluminescence of YVO4 : Dy3+ Phosphor Induced by Ultraviolet Excitation%Influence of y3+,Bi3+ Content on Photoluminescence of YVO4:Dy3+ Phosphor Induced by Ultraviolet Excitation

    Institute of Scientific and Technical Information of China (English)

    HE Yu-yang; ZHAO Mai-qun; SONG Yan-yan; ZHAO Gao-yang; LI Feng

    2011-01-01

    YxVO4:0.01Dy3+ and Y0.99-xVO4:0.01Dy3+,xBi3+ phosphors were synthesized by chemical coprecipitation method.Their crystal structure,micromorphology and photoluminescence (PL) properties were investigated by X-ray diffraction (XRD),scan electron microscopy (SEM) and spectrofluorometer.YxVO4:0.01Dy3+ and Y0.99-xVO4:0.01Dy3+,xBi3+ phosphors have a broad excitation band from about 250 to 350 nm including a strongest peak at about 310 nm.Under its excitation,the emission spectra exhibits two sharp peaks,one of which centered at about 483 nm for 4 F9/2→6 H15/2 transition of Dy3+ and the other at about 574nm due to the 4F9/2→6H13/2 transition of Dy3+.For YxVO4:0.01Dy3+ (x=0.94,0.97,0.99,1.01,1.03)phosphor,with increasing value of x,the body color of phosphor changes from yellow to white and the strongest peak in the excitation spectra shifts a little to shorter wavelength.It is detrimental to luminous intensity when Y3+ content deviates stoichiometric ratio.For Y0.99-xVO4:0.01Dy3+,xBi3+ (x=0.01,0.05,0.1,0.15,0.2,0.25) phosphor,the samples have extraneous bismuth vanadium oxide phase except for the major tetragonal zircon structure when x≥0.20.With increasing value of x,the band edge in the excitation spectra shifts to longer wavelength,the excitation intensity and luminous intensity increase early and decrease late.When the value of x is 0.01,the intensities increase evidently.In addition,the influence of Y3+ or Bi3+ on the color temperature of emission and micromorphology of YVO4:Dy3+ is slight.

  11. 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)

  12. Pressure and temperature dependence kinetics study of the NO + BrO yielding NO2 + Br reaction - Implications for stratospheric bromine photochemistry

    Science.gov (United States)

    Watson, R. T.; Sander, S. P.; Yung, Y. L.

    1979-01-01

    The reactivity of NO with BrO radicals over a wide range of pressure (100-700 torr) and temperature (224-398 K) is investigated using the flash photolysis-ultraviolet absorption technique. The flash photolysis system consists of a high-pressure xenon arc light source, a reaction cell/gas filter/flash lamp combination, and a 216.5 half-meter monochromator/polychromator/spectrography for wavelength selectivity. The details of the reaction and its corresponding Arrhenius expression are identified. The results are compared with previous measurements, and atmospheric implications of the reaction are discussed. The NO + BrO yielding NO2 + Br reaction is shown to be important in controlling the concentration ratios of BrO/Br and BrO/HBr in the stratosphere, but this reaction does not affect the catalytic efficiency of BrOx in ozone destruction.

  13. Biologisch bemesten lastig te plannen

    NARCIS (Netherlands)

    Sukkel, W.

    2001-01-01

    Als voorbeeld van een bemestingsplan wordt het experimentele biologische systeem te Meterik gebruikt. Hierbij wordt uitgegaan van een evenwichtsbemesting voor fosfaat. Tevens is het belang van een goede vruchtwisseling belicht

  14. 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)

    B. Werner

    2012-10-01

    Full Text Available We report on time-dependent O3, NO2 and BrO profile measurements taken in the stratosphere by limb observations of scattered skylight at high-latitudes during 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 indicates that, the measurements can be used to constrain the ratio J(BrONO2/kBrO+NO2, for which overall a 1.69 ± 0.04 larger ratio is found than indicated by the most recent JPL compilation (Sander et al., 2011. Sensitivity studies reveal the major reasons 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 J(BrONO2/kBrO+NO2 ratio 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 brings estimates of total stratospheric bromine inferred from organic source gas measurements (i.e. CH3Br, the halons, CH2Br2, CHBr3, ... 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 an overestimated Bry using the inorganic method would in return almost cancel out with the amount of reactive bromine calculated in the photochemical models.

  15. Measurement of the differential cross section for the production of an isolated photon with associated jet in ppbar collisions at $\\sqrt{s}$=1.96 TeV

    CERN Document Server

    Abazov, V M; Abolins, M; Acharya, B S; Adams, M; Adams, T; Aguiló, E; Ahn, S H; Ahsan, M; Alexeev, G D; Alkhazov, G; Alton, A; Alverson, G; Alves, G A; Anastasoaie, M; Ancu, L S; Andeen, T; Anderson, S; Andrieu, B; Anzelc, M S; Aoki, M; Arnoud, Y; Arov, M; Arthaud, M; Askew, A; sman, B; Assis-Jesus, A C S; Atramentov, O; Avila, C; Badaud, F; Baden, AA; Bagby, L; Baldin, B; Bandurin, D V; Banerjee, P; Banerjee, S; Barberis, E; Barfuss, A F; Bargassa, P; Baringer, P; Barreto, J; Bartlett, J F; Bassler, U; Bauer, D; Beale, S; Bean, A; Begalli, M; Begel, M; Belanger-Champagne, C; Bellantoni, L; Bellavance, A; Benítez, J A; Beri, S B; Bernardi, G; Bernhard, R; Bertram, I; Besançon, M; Beuselinck, R; Bezzubov, V A; Bhat, P C; Bhatnagar, V; Biscarat, C; Blazey, G; Blekman, F; Blessing, S; Bloch, D; Bloom, K; Böhnlein, A; Boline, D; Bolton, T A; Boos, E E; Borissov, G; Bose, T; Brandt, A; Brock, R; Brooijmans, G; Bross, A; Brown, D; Buchanan, N J; Buchholz, D; Bühler, M; Büscher, V; Bunichev, V; Burdin, S; Burke, S; Burnett, T H; Buszello, C P; Butler, J M; Calfayan, P; Calvet, S; Cammin, J; Carvalho, W; Casey, B C K; Castilla-Valdez, H; Chakrabarti, S; Chakraborty, D; Chan, K; Chan, K M; Chandra, A; Charles, F; Cheu, E; Chevallier, F; Cho, D K; Choi, S; Choudhary, B; Christofek, L; Christoudias, T; Cihangir, S; Claes, D; Clutter, J; Cooke, M; Cooper, W E; Corcoran, M; Couderc, F; Cousinou, M C; Crepe-Renaudin, S; Cutts, D; Cwiok, M; Da Motta, H; Das, A; Davies, G; De, K; De Jong, S J; De La Cruz-Burelo, E; De Oliveira Martins, C; Degenhardt, J D; Dliot, F; Demarteau, M; Demina, R; Denisov, D; Denisov, S P; Desai, S; Diehl, H T; Diesburg, M; Dominguez, A; Dong, H; Dudko, L V; Duflot, L; Dugad, S R; Duggan, D; Duperrin, A; Dyer, J; Dyshkant, A; Eads, M; Edmunds, D; Ellison, J; Elvira, V D; Enari, Y; Eno, S; Ermolov, P; Evans, H; Evdokimov, A; Evdokimov, V N; Ferapontov, A V; Ferbel, T; Fiedler, F; Filthaut, F; Fisher, W; Fisk, H E; Fortner, M; Fox, H; Fu, S; Fuess, S; Gadfort, T; Galea, C F; Gallas, E; García, C; García-Bellido, A; Gavrilov, V; Gay, P; Geist, W; Gel, D; Gerber, C E; Gershtein, Yu; Gillberg, D; Ginther, G; Gollub, N; Golovanov, G A; Gmez, B; Goussiou, A; Grannis, P D; Greenlee, H; Greenwood, Z D; Gregores, E M; Grenier, G; Gris, P; Grivaz, J F; Grohsjean, A; Grünendahl, S; Grünewald, M W; Guo, F; Guo, J; Gutíerrez, G; Gutíerrez, P; Haas, A; Hadley, N J; Haefner, P; Hagopian, S; Haley, J; Hall, I; Hall, R E; Han, L; Harder, K; Harel, A; Hauptman, J M; Hauser, R; Hays, J; Hebbeker, T; Hedin, D; Hegeman, J G; Heinson, A P; Heintz, U; Hensel, C; Herner, K; Hesketh, G; Hildreth, M D; Hirosky, R; Hobbs, J D; Hoeneisen, B; Hoeth, H; Hohlfeld, M; Hong, S J; Hossain, S; Houben, P; Hu, Y; Hubacek, Z; Hynek, V; Iashvili, I; Illingworth, R; Ito, A S; Jabeen, S; Jaffré, M; Jain, S; Jakobs, K; Jarvis, C; Jesik, R; Johns, K; Johnson, C; Johnson, M; Jonckheere, A; Jonsson, P; Juste, A; Kajfasz, E; Kalk, J M; Karmanov, D; Kasper, P A; Katsanos, I; Kau, D; Kaushik, V; Kehoe, R; Kermiche, S; Khalatyan, N; Khanov, A; Kharchilava, A; Kharzheev, Yu M; Khatidze, D; Kim, T J; Kirby, M H; Kirsch, M; Klima, B; Kohli, J M; Konrath, J P; Korablev, D E; Kozelov, A V; Kraus, J; Krop, D; Kühl, T; Kumar, A; Kupco, A; Kura, T; Kuzmin, V A; Kvita, J; Lacroix, F; Lam, D; Lammers, S; Landsberg, G; Lebrun, P; Lee, W M; Leflat, A; Lellouch, J; Lévêque, J; Li, J; Li, L; Li, Q Z; Lietti, S M; Lima, J G R; Lincoln, D; Linnemann, J; Lipaev, V V; Lipton, R; Liu, Y; Liu, Z; Lobodenko, A; Lokajícek, M; Love, P; Lubatti, H J; Luna, R; Lyon, A L; Maciel, A K A; Mackin, D; Madaras, R J; Mättig, P; Magass, C; Magerkurth, A; Mal, P K; Malbouisson, H B; Malik, S; Malyshev, V L; Mao, H S; Maravin, Y; Martin, B; McCarthy, R; Melnitchouk, A; Mendoza, L; Mercadante, P G; Merkin, M; Merritt, K W; Meyer, A; Meyer, J; Millet, T; Mitrevski, J; Mommsen, R K; Mondal, N K; Moore, R W; Moulik, T; Muanza, G S; Mulhearn, M; Mundal, O; Mundim, L; Nagy, E; Naimuddin, M; Narain, M; Naumann, N A; Neal, H A; Negret, J P; Neustroev, P; Nilsen, H; Nogima, H; Novaes, S F; Nunnemann, T; O'Dell, V; O'Neil, D C; Obrant, G; Ochando, C; Onoprienko, D; Oshima, N; Osman, N; Osta, J; Otec, R; Oteroy-Garzon, G J; Owen, M; Padley, P; Pangilinan, M; Parashar, N; Park, S J; Park, S K; Parsons, J; Partridge, R; Parua, N; Patwa, A; Pawloski, G; Penning, B; Perfilov, M; Peters, K; Peters, Y; Pétroff, P; Petteni, M; Piegaia, R; Piper, J; Pleier, M A; Podesta-Lerma, P L M; Podstavkov, V M; Pogorelov, Y; Pol, M E; Polozov, P; Pope, B G; Popov, A V; Potter, C; Prado da Silva, W L; Prosper, H B; Protopopescu, S; Qian, J; Quadt, A; Quinn, B; Rakitine, A; Rangel, M S; Ranjan, K; Ratoff, P N; Renkel, P; Reucroft, S; Rich, P; Rieger, J; Rijssenbeek, M; Ripp-Baudot, I; Rizatdinova, F; Robinson, S; Rodrigues, R F; Rominsky, M; Royon, C; Rubinov, P; Ruchti, R; Safronov, G

    2008-01-01

    The process ppbar -> photon + jet + X is studied using 1.0 fb^-1 of data collected by the D0 detector at the Fermilab Tevatron ppbar collider at a center-of-mass energy $\\sqrt{s}$=1.96 TeV. Photons are reconstructed in the central rapidity region |y_gamma|15 GeV. The differential cross section d^3sigma/dPt_gamma dy_gamma dy_jet is measured as a function of Pt_gamma in four regions, differing by the relative orientations of the photon and the jet in rapidity. Ratios between the differential cross sections in each region are also presented. Next-to-leading order QCD predictions using different parameterizations of parton distribution functions and theoretical scale choices are compared to the data. The predictions do not simultaneously describe the measured normalization and Pt_gamma dependence of the cross section in any of the four measured regions.

  16. Brûlure chez l’épileptique: brûlure pas comme les autres

    Science.gov (United States)

    Boukind, S.; Elatiqi, O.K.; Dlimi, M.; Elamrani, D.; Benchamkha, Y.; Ettalbi, S.

    2015-01-01

    Summary L’association brûlure et épilepsie est une constatation fréquente au Maroc. Ces brûlures, souvent itératives, touchent le plus souvent des femmes jeunes de milieu rural. L’accident survient habituellement au domicile, le plus souvent dans la cuisine à la suite d’une chute sur un moyen de cuisson posé au sol. Elles peuvent être inaugurales de la maladie mais surviennent plus souvent chez des patients connus mais au traitement mal suivi. Les conséquences de ces brûlures, toujours profondes, sont souvent dramatiques en termes de séquelles, chez des patients ayant déjà une insertion sociale rendue difficile par l’épilepsie. La prise en charge doit être multidisciplinaire et concerner à la fois la brûlures et l’épilepsie. Des mesures de prévention simples, visant à équilibrer l’épilepsie et éviter au patient de se trouver seul à proximité d’une source de chaleur, doivent être mises en place. PMID:27252613

  17. BRIGHT LONG AFTERGLOW PHOSPHORESCENCE GLASS MADE OF SrAl2O4: Eu2+, Dy3+ AND GLASS FRITS

    Institute of Scientific and Technical Information of China (English)

    X.Y. Zhang; Z.F. Cao; L.P. Lu; Z.H. Bai; W.Z. Wang; X.C. Wang

    2005-01-01

    Bright long afterglow phosphorescence glasses were prepared by using SrAl2O4 : Eu2+, Dy3+ phosphors and suitable glass frits together. The SrAl2O4: Eu2+,Dy3+ phosphors were initially prepared by the solid reaction method. Three kinds of glass frits were prepared to match the SrAl2O4: Eu2+,Dy3+ phosphors. Effects of the compositions of the glass frits, the ratios of the phosphors to the frits as well as the firing temperature and firing times on the properties of the samples were discussed. XRD analysis indicated the samples exhibited the typical diffraction peaks of SrAl2O4:Eu2+, Dy3+. The emission spectra of the samples showed broad bands peaking at 510nm. The excitation spectra of the samples showed broad bands ranging from 300 to 480nm. These are believed due to the 5d4f-4f transitions of Eu2+ in the SrAl2O4: Eu2+, Dy3+ phosphors. The afterglow luminescence of the samples excited by a 40W fluorescence lamp for 30min can be observed in the dark for more 10h with the naked eyes. It can find wide applications in many fields.

  18. White light emission from Tm3+/Dy3+ co-doped oxyfluoride germanate glasses under UV light excitation

    International Nuclear Information System (INIS)

    In this paper, we report on the absorption and photoluminescence properties of Tm3+/Dy3+ ions co-doped oxyfluoride germanate glasses for white light emission. The X-ray diffraction (XRD) and differential thermal analysis (DTA) profiles of the host glass have been carried out to confirm its structure and thermal stability. From the measured absorption spectra, Judd-Ofelt (J-O) intensity parameters (Ω2, Ω4 and Ω6) have been evaluated for Tm3+ and Dy3+ ions. A combination of blue, yellow and red emissions has emerged in these glasses, which allows the observation of bright white light when the glasses are excited by the ultraviolet light. The white light luminescence colour could be changed by varying the excitation wavelength. Also, various colours of luminescence, including white light, can be easily tuned by adjusting the concentrations of Tm3+ or Dy3+ ions in the co-doped glasses. Concentration quenching effect was also investigated and possible energy transfer mechanism from Dy3+→Tm3+ ions was explained which is also confirmed by the decay lifetime measurements. - Graphical Abstract: A combination of blue, yellow and red emissions has emerged from Tm3+/Dy3+ co-doped glasses, which allows the observation of bright white light and makes them as excellent candidates applicable in the solid-state multi-colour three-dimensional display.

  19. 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.

  20. Crystal structure and magnetic properties of Dy{sub 11}Ni{sub 4}In{sub 9}

    Energy Technology Data Exchange (ETDEWEB)

    Tyvanchuk, Yu. [Analytical Chemistry Department, Ivan Franko National University of Lviv, Kyryla and Mephodiya 6, 79005 Lviv (Ukraine); Baran, S., E-mail: stanislaw.baran@uj.edu.pl [M. Smoluchowski Institute of Physics, Jagiellonian University, Reymonta 4, PL-30-059 Kraków (Poland); Duraj, R. [Institute of Physics, Technical University of Cracow, Podchorążych 1, PL-30-084 Kraków (Poland); Kalychak, Ya.M. [Analytical Chemistry Department, Ivan Franko National University of Lviv, Kyryla and Mephodiya 6, 79005 Lviv (Ukraine); Przewoźnik, J. [AGH University of Science and Technology, Faculty of Physics and Applied Computer Science, Department of Solid State Physics, al. Mickiewicza 30, 30-059 Kraków (Poland); Szytuła, A. [M. Smoluchowski Institute of Physics, Jagiellonian University, Reymonta 4, PL-30-059 Kraków (Poland)

    2014-02-25

    Highlights: • Crystal structure of the new Dy{sub 11}Ni{sub 4}In{sub 9} rare earth intermetallic is reported. • The compound shows magnetic ordering below 86 K. • Isothermal magnetization curves indicate complex magnetic properties. -- Abstract: The work reports on the crystal structure and magnetic properties of Dy{sub 11}Ni{sub 4}In{sub 9}. The compound crystallizes in the orthorhombic Nd{sub 11}Pd{sub 4}In{sub 9}-type structure (space group Cmmm) with Dy atoms occupying five nonequivalent Wyckoff positions. Temperature dependences of specific heat as well as ac and dc magnetic susceptibility show a ferromagnetic-like ordering with T{sub C} = 86 K and additional magnetic transitions at lower temperatures. The fit to the reciprocal susceptibility data above 180 K, in a paramagnetic state, follows the Curie–Weiss law and provides μ{sub eff} = 10.86 μ{sub B}/Dy-atom (close to the theoretical value of 10.65 μ{sub B} for the free Dy{sup 3+} ion) and a positive paramagnetic Curie temperature θ{sub p} = 28 K. Ni atoms are most likely nonmagnetic. The existence of a hysteresis loop below T{sub C} indicates a change of magnetic properties. The coercivity field is large at low temperatures (50 kOe at 1.9 K) and decreases gradually with increasing temperature down to 0.01 kOe at 75 K.

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

    International Nuclear Information System (INIS)

    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 0 ≲ 0.25 R ☉, 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 MB = –18.72 ± 0.03 mag ∼17.7 days after first light

  2. 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

  3. 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)

  4. 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)

  5. Chemical beam epitaxy of CdTe, HgTe, and HgCdTe

    Energy Technology Data Exchange (ETDEWEB)

    Benz, R.G. II; Wagner, B.K.; Rajavel, D.; Summers, C.J. (Physical Sciences Lab., Georgia Tech Research Inst., Atlanta, GA (USA))

    1991-05-01

    A chemical beam epitaxy (CBE) system has been implemented for the growth of CdTe, HgTe, and their alloys. The system is briefly described. Results on the cracking of the organometallic source gases are presented. Epitaxial layers have been grown from gas sources of diethylcadmium, diisopropyltelluride and Hg vapor, as well as conventional solid sources. Optical and electrical properties are reported, demonstrating the potential of CBE for growing high quality solar cell and infrared detector material. (orig.).

  6. Analysis of an unusual hetero-halogen bonded trimer using charge density analysis: A case of concerted type I Br· · · Br and type II Br· · · Cl interactions

    Indian Academy of Sciences (India)

    MYSORE S PAVAN; TAYUR N GURU ROW

    2016-10-01

    The crystal structure of 4−bromo−2−chlorobenzoic acid generates an unusual triangular motif consisting of a hitherto uncharacterized Type I Br· · · Br contact along with two Type II Br· · · Cl interactions as edges of the triangle. The nature of such bonding is analyzed based on both experimental and theoretical chargedensity followed by topological analysis.

  7. Electronic, lattice vibration and mechanical properties of CdTe, ZnTe, MnTe, MgTe, HgTe and their ternary alloys

    International Nuclear Information System (INIS)

    The main representative telluride family, CdTe, ZnTe, MnTe, MgTe and HgTe, and their mixed ternary alloys have been extensively studied, but some points bearing on phonon frequencies properties have never been previously reported or are still not clear. In this paper, we report results on the electronic, lattice dynamical and mechanical properties for this family in the zinc–blende (ZB) structure. Numerical calculations based on the empirical pseudo-potential method under the virtual crystal approximation combined with the Harrison bond orbital model are used to investigate these properties. Our results are found to be generally in good agreement with the available experimental data. Other case, our results are predictions and may serve as a reference. The information derived from the present study demonstrates the potential of the materials of interest for optoelectronic and photovoltaic device applications from the ultraviolet to infrared and mid-infrared

  8. Material test reactor fuel research at the BR2 reactor

    International Nuclear Information System (INIS)

    The construction of new, high performance material test reactor or the conversion of such reactors' core from high enriched uranium (HEU) to low enriched uranium (LEU) based fuel requires several fuel qualification steps. For the conversion of high performance reactors, high density dispersion or monolithic fuel types are being developed. The Uranium-Molybdenum fuel system has been selected as reference system for the qualification of LEU fuels. For reactors with lower performance characteristics, or as medium enriched fuel for high performance reactors, uranium silicide dispersion fuel is applied. However, on the longer term, the U-Mo based fuel types may offer a more efficient fuel alternative and-or an easier back-end solution with respect to the silicide based fuels. At the BR2 reactor of the Belgian nuclear research center, SCK-CEN in Mol, several types of fuel testing opportunities are present to contribute to such qualification process. A generic validation test for a selected fuel system is the irradiation of flat plates with representative dimensions for a fuel element. By flexible positioning and core loading, bounding irradiation conditions for fuel elements can be performed in a standard device in the BR2. For fuel element designs with curved plates, the element fabrication method compatibility of the fuel type can be addressed by incorporating a set of prototype fuel plates in a mixed driver fuel element of the BR2 reactor. These generic types of tests are performed directly in the primary coolant flow conditions of the BR2 reactor. The experiment control and interpretation is supported by detailed neutronic and thermal-hydraulic modeling of the experiments. Finally, the BR2 reactor offers the flexibility for irradiation of full size prototype fuel elements, as 200mm diameter irradiation channels are available. These channels allow the accommodation of various types of prototype fuel elements, eventually using a dedicated cooling loop to provide the

  9. 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...

  10. PROPERTIES OF Dy3+ -DOPED Ge - Ga - Se CHALCOGENIDE GLASSES%Dy3+掺杂Ge-Ga-Se硫系玻璃的性质

    Institute of Scientific and Technical Information of China (English)

    赵东辉; 夏方; 王华; 陈国荣; NEMEC Petr; FRUMAR Miloslav; 李顺光; 胡丽丽

    2005-01-01

    Dy3+-doped chalcogenide glasses in Ge - Ga - Se system were prepared and the properties of glasses samples including density, microhardness, visilble- infrared transmission spectra, emission spectra and fluorescence life were measured. The molar volume and compactness of glasses were calculated from the density data obtained. The properties of glasses as a function of the average coordination number <r> were discussed. Results show that good fluorescent properties are obtained at 1.3μm when <r> is greater than 2.67 and the measured emission lifetime is from 440 μs to 530 μs. The strongest emission is found in the glass at the chemical threshold of <r> = 2.73.%实验制备了Dy3+掺杂Ge-Ga-Se系统硫系玻璃样品,测试了玻璃的密度、显微硬度、可见-红外透射光谱、荧光光谱以及荧光寿命.根据玻璃的密度计算了玻璃的摩尔体积以及致密度.讨论了玻璃的这些性能随系统平均配位数<r>的变化关系.实验结果表明:该系统中配位数大于2.67的玻璃在1.3 μm具有较好的发光性能,荧光寿命在440~530μs之间,当玻璃组成位于化学门槛即平均配位数为2.73时玻璃的发光强度最强.

  11. 一类 Brahraagupta-Fennat-Pell 方程 x2 - dy2 = ± 1%The Brahmagupta-Fermat-Pell Equation x2 - dy2 = + 1

    Institute of Scientific and Technical Information of China (English)

    Michel Waldschmidt

    2011-01-01

    This paper corresponds to the written versions of many lectures at several locations including the most recent one at Weinan Teachers University on June 8, 2011. I would like to thank Professor Hailong Li for inviting me to publish this in the journal of his university. I wish also to express my deep gratitude to my friend Shigeru Kanemitsu, thanks to whom I could visit Weinan Teachers University, and who also came up with a written version of these notes. The topic is centered around the equation x2 - dy2 = + 1 , which is important because it produces the (infinitely many) units of real quadratic fields. This equation, where the unknowns x and y are positive integers while d is a fixed positive integer which is not a square, has been mistakenly called with the name of Pell by Euler. It was investigated by Indian mathematicians since Brahmagupta (628) who solved the case d = 92, then by Bhaskara Ⅱ (1150) for d = 61 and Narayana (during the 14-th Century) for d = 103. The smallest solution of x2 - dy2 = 1 for these values of d are respectively 1 1512-92· 1202 = 1, 1 766 319 0492-61 -226 153 9802 = 1 and 227 5282 - 103 · 22 4192 = 1, and hence they could not have been found by a brute force search! After a short introduction to this long story of Pell's equation, we explain its connection with Diophantine approximation and continued fractions ( which have close connection with the structure of real quadratic fields), and we conclude by saying a few words on more recent developments of the subject in terms of varieties. Finally we mention applications of continued fraction expansion to electrical circuits.

  12. Competition of single-ion anisotropy of Sm and Dy ions during the spin-reorientation transition in (Nd1- x- y Sm x Dy y )(FeCo)B supermagnets

    Science.gov (United States)

    Kablov, E. N.; Ospennikova, O. G.; Piskorskii, V. P.; Korolev, D. V.; Kunitsyna, E. I.; Talantsev, A. D.; Morgunov, R. B.

    2016-07-01

    It has been found that an increase in the Sm concentration in the range x = 0.05-0.18 in (Nd1‒ x‒ y Sm x Dy y )(FeCo)B supermagnets leads to a shift in the spin-reorientation transition temperature to higher values, whereas a Dy addition results in a decrease in the transition temperature. Single-ion anisotropy of Sm and Dy ions has different symmetry, making contributions of opposite signs to the resulting magnetic anisotropy of the lattice. Therefore, the threshold temperature T S of the spin-reorientation transition, which is determined by the balance of magnetic anisotropies of sublattices, can be controlled using ions with different symmetries.

  13. 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.

  14. Simultaneous balloon-borne measurements of the key inorganic bromine species BrO and BrONO2 in the stratosphere: DOAS and MIPAS-B evaluation

    Science.gov (United States)

    Kazarski, Sebastian; Maucher, Guido; Ebersoldt, Andreas; Butz, André; Friedl-Vallon, Felix; Höpfner, Michael; Kleinert, Anne; Nordmeyer, Hans; Oelhaf, Hermann; Pfeilsticker, Klaus; Sinnhuber, Björn-Martin; Wetzel, Gerald; Orphal, Johannes

    2015-04-01

    Inorganic bromine contributes to a loss of stratospheric ozone of about 25 - 30%. Past studies have demonstrated several uncertainties in the photochemistry of stratospheric bromine, especially by considering the three body reaction (kBrONO2) BrO + NO2 + M → BrONO2 + M, and the photolysis frequencies of BrONO2 (jBrONO2). Hence, an improved knowledge of the ratio jBrONO2/kBrONO2 is crucial to better assess the bromine-related loss of ozone as well as the total amount of bromine in the stratosphere. Here, we report on the first simultaneous balloon-borne measurements of NO2, BrO, and BrONO2 in the stratosphere, performed over Timmins (Ontario, 49 °N, Canada) on Sept., 7th and 8th, 2014. During the flight the targeted species were monitored by remote sensing in the UV, visible and mid-IR spectral ranges by Differential Optical Absorption Spectroscopy (DOAS) and Michelson Interferometer for Passive Atmospheric Sounding (MIPAS-B), respectively. The analysis and interpretation of the measurements involves radiative transfer as well as photochemical modelling. Major features of the applied techniques are reported and first results of the DOAS as well as MIPAS-B evaluation are discussed. Further investigations address inter-comparisons of the retrieved NO2, BrO, and O3 concentrations and volume mixing ratios, to demonstrate validations of both evaluation methods.

  15. Rare-earth transition-metal chalcogenides Ln3MGaS7 (Ln=Nd, Sm, Dy, Er; M=Co, Ni) and Ln3MGaSe7 (Ln=Nd, Sm, Gd, Dy, M=Co; Ln=Nd, Gd, Dy, M=Ni)

    International Nuclear Information System (INIS)

    Fifteen new rare-earth transition-metal chalcogenides, Ln3MGaS7 (Ln=Nd, Sm, Dy, Er; M=Co, Ni) and Ln3MGaSe7 (Ln=Nd, Sm, Gd, Dy, M=Co; Ln=Nd, Gd, Dy, M=Ni), have been synthesized by solid state reactions. They are isostructural, adopt Ce3Al1.67S7—related structure type, and crystallize in the non-centrosymmetric hexagonal space group P63. They adopt a three-dimensional framework composed of LnQ7 monocapped trigonal prisms with the interesting [MQ3]4− chains and isolated GaQ4 tetrahedra lying in two sets of channels in the framework. The magnetic susceptibility measurements on Ln3CoGaQ7 (Ln=Dy, Er, Q=S; Ln=Dy, Q=Se) indicate that they are paramagnetic and obey the Curie–Weiss law over the entire experimental temperature, while the magnetic susceptibility of Sm3CoGaSe7 deviates from the Curie–Weiss law as a result of the crystal field splitting. - Graphical abstract: Ln3MGaS7 (Ln=Nd, Sm, Dy, Er; M=Co, Ni) and Ln3MGaSe7 (Ln=Nd, Sm, Gd, Dy, M=Co; Ln=Nd, Gd, Dy, M=Ni) adopt a three-dimensional framework composed of LnQ7 monocapped trigonal prisms with interesting [MQ3]4− chains and isolated GaQ4 tetrahedra lying in two sets of channels in the framework. - Highlights: • New compounds, Ln3MGaQ7 (Ln=rare-earth; M=Co, Ni; Q=S, Se), were synthesized. • They are isostructural and crystallize in the noncentrosymmetric space group P63. • They adopt a three-dimensional framework built by LnQ7 monocapped trigonal prisms. • Ln3CoGaQ7 (Ln=Dy, Er; Q=S, Se) are paramagnetic and obey the Curie–Weiss law. • The magnetic susceptibility of Sm3CoGaSe7 deviates from the Curie–Weiss law

  16. ELECTRON TRANSFER IN Hg1-xCdxTe-CdTe HETEROSTRUCTURES

    OpenAIRE

    Boebinger, G.; Vieren, J.; Guldner, Y.; Voos, M.; Faurie, J.

    1987-01-01

    Far infrared magneto-absorption experiments performed at 1.6K in HgCdTe-CdTe heterojunctions show that a two-dimensional electron gas is formed in the HgCdTe layer at the HgCdTe-CdTe interface. The electron effective masses of the two populated subbands is obtained and compared to previous theoretical calculations. The electron transfer across the interface involves deep traps in the CdTe layers.

  17. Pell方程x2-Dy2=±2的解的递推性质%The Recurrence Relations of the Solutions of Pe11 Equation x2-Dy2 =±2

    Institute of Scientific and Technical Information of China (English)

    吴莉; 王学平; 杨仕椿

    2013-01-01

    在各类不定方程中,Pell方程x2-Dy2=N是一类基础而重要的Diophantine方程,其正整数解与实二次域的基本单位以及其它代数数论理论有密切联系,对解高次丢翻图方程以及有关递推数列问题有广泛且深入的应用.利用Pell方程的基本解的性质,对方程x2-Dy2=±2的通解进行了讨论,获得了该方程解的一个三阶递推性质,证明了文献(A.Tekcan.Irish.Math.Soc.Bulletin,2004,54(1):73-89.)提出的一个猜想.最后,提出了关于Pell方程x2-Dy2=-2可解性的一些待解决的问题.%Among all kinds of Diophantine equations, Pell equation x2 - Dy2 = N is basic and important. Its positive integer solution is closely linked with the fundamental unit of real quadratic field and other algebraic number theory and is extensively applied to solve high-order Diophantine equations and the problems on recursive number serieses. Using the properties of the fundamental solution of Pell equation, the equation x2 - Dy2 = ± 2 is discussed, and a third-order recursive property of the solution is obtained, a conjecture of A. Tekcan( Irish. Math. Soc. Bulletin,2004,54( 1) :73-89. ) is proved. Finally, a number of usolved problems of Pell equation x2 - Dy2 = - 2 are put forward.

  18. Allyl- iso-propyltelluride, a new MOVPE precursor for CdTe, HgTe and (Hg,Cd)Te

    Science.gov (United States)

    Hails, Janet E.; Cole-Hamilton, David J.; Stevenson, John; Bell, William

    2000-06-01

    The use of allyl- iso-propyltelluride as the tellurium precursor for the growth of CdTe, HgTe and (Hg,Cd)Te by metal organic vapour-phase epitaxy has been investigated. It has proved to be an efficient source of tellurium with growth rates for HgTe and (Hg,Cd)Te of up to 10 μm h -1 at 300°C. The best CdTe was grown at 4.5 μm h -1 under Me 2Cd-rich conditions at 300°C in the presence of Hg vapour.

  19. Les guides et inventaires patrimoniaux au Brésil

    OpenAIRE

    Kühl, Beatriz Mugayar

    2014-01-01

    La production des guides du patrimoine au Brésil, caractérisée par son extrême hétérogénéité, s’appuie dans la plupart des cas sur des listes de biens classés ou sur des inventaires qui ne garantissent pas la protection légale des édifices et qui sont souvent limités à de brèves descriptions sans ou avec peu d’analyses. Alors que des récits plus anciens de voyageurs présentaient des descriptions de villes, d’édifices et de paysages, tout en apportant un regard critique extérieur sur la réalit...

  20. Thermochemistry of Ternary Complex Dy(Et2dtc)3(phen)

    Institute of Scientific and Technical Information of China (English)

    朱丽; 焦宝娟; 杨旭武; 帅琪; 高胜利; 史启祯

    2004-01-01

    The ternary solid complex was synthesized with sodium diethyldithiocarbamate (NaEt2dtc), 1,10-phenanthroline (phen) and low hydrated dysprosium chloride in absolute ethanol by improved method of reference. The title complex was identified as the general formula of Dy(Et2dtc)3(phen) by chemical and elemental analyses. IR spectrum of the complex shows that the Dy3+ coordinated with six sulfur atoms of three NaEt2dtc and two nitrogen atoms of phen. It is assumed that the coordination number of Dy3+ is eight.The enthalpy change of liquid-phase reaction of formation, ΔrHθm(l), is determined as (-19.091±0.015) kJ·mol-1 at 298.15 K by a microcalorimeter, and the enthalpy change of the solid-phase reaction of formation, ΔrHθm(s), is calculated as (139.641±0.482) kJ·mol-1 on the basis of a thermochemical cycle. The thermodynamic of reaction of formation was studied by changing the temperature of liquid-phase reaction. The constant-volume combustion energy of the complex, ΔcU, is determined as (-16730.21±9.25) kJ·mol-1 by a precise rotating-bomb calorimeter at 298.15 K. Its standard enthalpies of combustion, ΔcHθm, and standard enthalpies of formation, ΔfHθm, are calculated as (-16749.42±9.25) kJ·mol-1 and (-2019.68±10.19) kJ·mol-1, respectively.

  1. Optical absorption and fluorescence properties of Dy{sup 3+}: SFB glasses

    Energy Technology Data Exchange (ETDEWEB)

    Maheswari, D Uma; Kumar, J Suresh; Sasikala, T; Babu, A Mohan; Pavani, K; Moorthy, L Rama [Department of Physics, Sri Venkateswara University, Tirupati - 517 502 (India); Jang, Kiwan, E-mail: lrmphysics@yahoo.co.in [Department of Physics, Changwon National University, Changwon (Korea, Republic of)

    2009-07-15

    This paper presents the preparation and spectroscopic characterization of Dy{sup 3+}-doped sodium fluoroborate (SFB) glasses of the type (50-x) B{sub 2}O{sub 3} + 25 Na{sub 2}O + 10 CaF{sub 2} + 10 AlF{sub 3} + 5 LaF{sub 3} + x DyF{sub 3} (x = 0.01, 0.1, 0.5,1.0, 2.0 and 4.0 mol%). By measuring the area under absorption bands, the experimental oscillator strengths are determined. The Judd-Ofelt (J-O) intensity parameters {Omega}{sub {lambda}} ({lambda} = 2, 4, 6) are evaluated by the least square fit method. These phenomenological parameters are used to predict luminescence properties of the lanthanide ions in SFB glasses. Photoluminescence spectra and lifetimes of {sup 4}F{sub 9/2} level of Dy{sup 3+} ions in these glasses have been measured by exciting with 348 nm line of xenon flash lamp. The measured decay curves exhibit single exponential at lower concentrations of 0.01, 0.1, 0.5 and 1.0 mol% and non-exponential at higher concentrations of 2.0 and 4.0 mol%. The predicted {tau}{sub R} and ({beta}{sub R} values of {sup 4}F{sub 9/2} transition are compared with the experimentally measured values. From the magnitude of stimulated emission cross sections ({sigma}{sub e}), branching ratios ({beta}{sub m}), multiphonon relaxation rates (W{sub MP}), the most potential laser transitions are identified and the utility of these glasses as laser active material is discussed.

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

    Directory of Open Access Journals (Sweden)

    Chanitsara Duangbubpa

    2015-08-01

    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.

  3. Dy{sup 3+}-doped Ga–Sb–S chalcogenide glasses for mid-infrared lasers

    Energy Technology Data Exchange (ETDEWEB)

    Zhang, Mingjie [Jiangsu Key Laboratory of Advanced Laser Materials and Devices, School of Physics and Electronic Engineering, Jiangsu Normal University, Xuzhou, Jiangsu 221116 (China); Yang, Anping, E-mail: apyang@jsnu.edu.cn [Jiangsu Key Laboratory of Advanced Laser Materials and Devices, School of Physics and Electronic Engineering, Jiangsu Normal University, Xuzhou, Jiangsu 221116 (China); Peng, Yuefeng [Institute of Applied Electronics, China Academy of Engineering Physics, Mianyang, Sichuan 621900 (China); Zhang, Bin; Ren, He; Guo, Wei; Yang, Yan; Zhai, Chengcheng; Wang, Yuwei; Yang, Zhiyong; Tang, Dingyuan [Jiangsu Key Laboratory of Advanced Laser Materials and Devices, School of Physics and Electronic Engineering, Jiangsu Normal University, Xuzhou, Jiangsu 221116 (China)

    2015-10-15

    Highlights: • Novel Ga–Sb–S chalcogenide glasses doped with Dy{sup 3+} ions were synthesized. • The glasses show good thermal stability and excellent infrared transparency. • The glasses show low phonon energy and intense mid-infrared emissions. • The mid-infrared emissions have high quantum efficiency. • The mid-infrared emissions have large stimulated emission cross sections. - Abstract: Novel Ga–Sb–S chalcogenide glasses doped with different amount of Dy{sup 3+} ions were prepared. Their thermal stability, optical properties, and mid-infrared (MIR) emission properties were investigated. The glasses show good thermal stability, excellent infrared transparency, very low phonon energy (∼306 cm{sup −1}), and intense emissions centered at 2.95, 3.59, 4.17 and 4.40 μm. Three Judd–Ofelt intensity parameters (Ω{sub 2} = 8.51 × 10{sup −20} cm{sup 2}, Ω{sub 4} = 2.09 × 10{sup −20} cm{sup 2}, and Ω{sub 6} = 1.60 × 10{sup −20} cm{sup 2}) are obtained, and the related radiative transition properties are evaluated. The high quantum efficiencies and large stimulated emission cross sections of the MIR emissions (88.10% and 1.11 × 10{sup −20} cm{sup 2} for 2.95 μm emission, 75.90% and 0.38 × 10{sup −20} cm{sup 2} for 4.40 μm emission, respectively) in the Dy{sup 3+}-doped Ga–Sb–S glasses make them promising gain materials for the MIR lasers.

  4. Crystalline, Magnetic and Electronic Structure of the Ba2DySbO6 Complex Perovskite

    Science.gov (United States)

    Cardona, R.; Moreno Mendoza, R.; Carrero Bermúdez, L. A.; Landínez Téllez, D. A.; Roa-Rojas, J.

    2016-01-01

    In this work, we report the synthesis of the Ba2DySbO6 new double perovskite by means of the solid-state reaction recipe from high-purity oxide powders of BaCO3, Dy2O3, and Sb2O5. The analysis of the crystal structure was carried out through the X-ray diffraction technique with posterior Rietveld refinement of the experimental diffraction data by the GSAS code. Results reveal that the Ba2DySbO6 material crystallizes in a rhombohedral perovskite structure, belonging to the R-3 (#148) space group with lattice parameter a = 5.96260(5) Å, and angle α = 60.008°. The magnetic characterization was performed by measurements of magnetic susceptibility as a function of temperature. The behavior observed in the temperature regime from 4 K up to 300 K was paramagnetic. The characteristic magnetic parameters were obtained from the fitting with the Curie equation, obtaining the values of susceptibility independent of temperature 0.00633 emu/mol and effective magnetic moment 8.9 \\upmu B, which is 84 % in agreement with the expected value predicted by the Hund's rules. The electronic structure was calculated by means of linearized augmented plane waves in the framework of the density functional theory (DFT). This study considers the cohesion energies as a function of the lattice parameter, with a lattice constant a, whose value is 98 % in agreement with the experimental result. Curves of density of states as a function of the wave number reveal that this material behaves as an insulator with energy gap 3.65 eV. This result was corroborated by diffuse reflectance experiments adjusted to the Kubelka-Munk equation. The effective magnetic moment obtained from the DFT calculations was 7.7 \\upmu B.

  5. Interaction of Rare Earth Ions in Sr2MgSi2O7:Eu2+, Dy3+ Material

    Institute of Scientific and Technical Information of China (English)

    HAI Ou; JIANG Hongyi; XU Dong; WANG Yahui; ZHENG Wei; LUO Ting

    2016-01-01

    To discuss the function of Eu and Dy and their interaction in Sr2MgSi2O7: Eu2+, Dy3+long afterglow material, the Eu and Dy single doped and their co-doped Sr2MgSi2O7: Eu2+, Dy3+ were prepared. The samples were characterized by X-ray diffraction (XRD), decay curves, photoluminescence (PL), and thermoluminescence (TL). The results indicate that Sr2MgSi2O7: Eu has afterglow properties, and the doping of Eu ion in Sr2MgSi2O7: Eu2+, Dy3+ can lower the depth of traps. Eu ion can not only serve as luminescence center, but also produce traps in the matrix, meanwhile, it also exerts certain inlfuences on the traps produced by Dy in Sr2MgSi2O7: Eu2+, Dy3+. The Dy ion can not act as luminescence center but relates to the change of the traps in the Sr2MgSi2O7 matrix.

  6. Vaporization of In2Te3(s)

    International Nuclear Information System (INIS)

    The vaporization chemistry of In2Te3(s) was studied by the computerautomated simultaneous Knudsen-effusion and torsion-effusion method, by high-temperature mass spectrometry, and by ancillary methods. The first absolute measurements of the vapor pressure of In2Te3 are reported. In2Te3(s) vaporized incongruently in the temperatue range 701-889 K and produced Te2(g) and a solid-solution, (Xsub(In)=0.42 and Xsub(Te)=0.58). The standard enthalpy of the reaction at 298 K, ΔH0 (298 K) by the third-law method was 136.0 +- 0.3 kJ/mol of vapor. The above solid solution vaporized incongruently and produced in InTe(s) and a vapor which consisted of Te2(g) and In2Te(g). InTe(s) vaporized congruently in the range 701-887 K and produded Te2(g) and In2Te(g); the third-law ΔH0sub(ν) (298 K) was 201.5 +- 1.0 kJ/mol. These results were at variance with the literature on vaporization of In2Te3(s) where both congruent vaporization and incongruent vaporization to give InTe(s) are separately reported. Further, InTe(s) was reported to vaporize incongruently. These differences are discussed. (Author)

  7. SrMoO4:Dy^3+荧光粉的制备及发光性能%Preparation and Photoluminescence of a Phosphor SrMoO4:Dy3+

    Institute of Scientific and Technical Information of China (English)

    林莹; 高绍康

    2012-01-01

    采用高温固相法合成了 SrMoO4:Dy^3+荧光粉。在紫外光(λ=353nm)激发下,该样品发射出 Dy^3+的特征光谱。用热分析仪、X 射线粉末衍射和荧光光谱对样品的结构、性能等进行了研究,考察了 Dy 的掺杂量、不同助熔剂对样品的结构和性能的影响,并讨论 Dy^3+浓度猝灭机理。研究表明:合成过程中添加适量的复合助熔剂 Li2CO3+H3BO3,并当 Dy^3+的掺杂量为 4%(摩尔分数)时,样品的荧光强度最强。这也说明了能量从基质 MoO4^2–传递到 Dy^3+是十分有效的。%Trivalent dysprosium ion (Oy3+) activated strontium molybdate (SrMoO4) phosphor was synthesized via solid-state reaction in a weak reductive atmosphere of active carbon. The effects of the sintering temperature, the activator concentration and the different fluxes on the luminescence properties were investigated by thermogravimetry~lerivative thermogravimetry, X-ray diffraction and photoluminescence spectroscopy, respectively. The excitation and emission spectra indicate that this phosphor can be effectively excited by near UV light of 387 urn, and it exhibits a bright yellow emitting. The optimum concentration for Dy3+ is 4%. The results indicate that SrMoO4:Dy3+ may be a potential luminescent material for solid-state lighting applications.

  8. Electrical conductivity studies on CuBr containing Al2O3 particles

    Science.gov (United States)

    Dubec, P. M.; Wagner, J. B., Jr.

    1984-01-01

    The conductivity of CuBr was studied and the role of a second phase, Al2O3, dispersed in CuBr was tested. CuBr melts at 493 C and exhibits three phases in the solid state. CuBr is a good ionic conductor with a transport number for copper ions of virtually unity with weighed proportions of the appropriate chemicals used. The CuBr materials were heated above melting point of CuBr, and the samples were sandwiched between copper electrodes. The ac conductivity, was determined at 1 kHz between 25 and 440 C depending on the sample. It was shown that at low temperatures, the conductivity for CuBr (Al2O3) increased by as much as 100, whereas in the beta phase the conductivity of CuBr containing Al2O3 decreased. The electrical conductivity studies are in agreement with earlier data.

  9. Chiral mononuclear lanthanide complexes and the field-induced single-ion magnet behaviour of a Dy analogue.

    Science.gov (United States)

    Lin, Shuang-Yan; Wang, Chao; Zhao, Lang; Wu, Jianfeng; Tang, Jinkui

    2015-01-01

    Three pairs of homochiral mononuclear lanthanide complexes, with the general formula [LnH4LRRRRRR/SSSSSS(SCN)2](SCN)2·xCH3OH·yH2O(Ln = Dy (R/S-Dy1), Ho (R/S-Ho1) and Er (R/S-Er1)), have been obtained via self-assembly between chiral macrocyclic ligands and the respective thiocyanates, all of which show a saddle-type conformation with seven-coordinated metal ions. Magnetic measurements revealed that the Dy complex shows field-induced single-ion magnet behaviour, which is rarely reported in a seven-coordinated lanthanide-based SIM encapsulated in a macrocyclic ligand. The absolute configuration of all enantiomers was determined by single crystal X-ray crystallography and confirmed by electronic CD and VCD spectra. PMID:25369972

  10. Crystal fields in Sc, Y, and the heavy-rare-earth metals Tb, Dy, Ho, Er, Tm, and Lu

    DEFF Research Database (Denmark)

    Touborg, P.

    1977-01-01

    Experimental investigations of the magnetic properties of dilute alloys of the rare-earth solutes Tb, Dy, Ho, Er, and Tm in the nonmagnetic hosts Lu, Y, and Sc have been performed. These measurements, which include and supplement earlier published results, have been analyzed and crystal-field par......Experimental investigations of the magnetic properties of dilute alloys of the rare-earth solutes Tb, Dy, Ho, Er, and Tm in the nonmagnetic hosts Lu, Y, and Sc have been performed. These measurements, which include and supplement earlier published results, have been analyzed and crystal...... results indicate a contribution from anisotropic exchange to the high-temperature paramagnetic anisotropy of approximately 20% for Tb, Dy, Ho, and Er, and approximately 10% for Tm....

  11. Magnetoelastic performance of 《110》 aligned polycrystalline Tb0.3Dy0.7Fe2

    Institute of Scientific and Technical Information of China (English)

    WENG Ling; WANG Bowen; SUN Ying; LI Shuying; Busbridge Simon

    2008-01-01

    The magnetoelasfic performance of aligned polycrystalline Tt0.3Dy0.7Fe2 was investigated.It has been round that the strata-stress curve is nearly linear without magnetic field,reflecting the purely mechanical elastic properties of the Tb0.3Dy0.7Fe2 rod.The strain-stress curve exhibits a complex behavior in magnetic field and can be divided into three stages.The different stages are explained with magneticdomains in the Tb0.3Dy0.7Fe2 rod alloy and the higher the magnetic field,the larger the stress to switch domains.The Young's modulus is also obtained from measuring the strain-stress curve and the variability of Young's modulus as the strain is analyzed.

  12. THEORETICAL RESEARCH OF THE OPTICAL SPECTRA AND EPR PARAMETERS FOR Cs2NaYCl6:Dy3+ CRYSTAL

    Science.gov (United States)

    Dong, Hui-Ning; Dong, Meng-Ran; Li, Jin-Jin; Li, Deng-Feng; Zhang, Yi

    2013-09-01

    The calculated EPR parameters are in reasonable agreement with the observed values. The important material Cs2NaYCl6 doped with rare earth ions have received much attention because of its excellent optical and magnetic properties. Based on the superposition model, in this paper the crystal field energy levels, the electron paramagnetic resonance parameters g factors of Dy3+ and hyperfine structure constants of 161Dy3+ and 163Dy3+ isotopes in Cs2NaYCl6 crystal are studied by diagonalizing the 42 × 42 energy matrix. In the calculations, the contributions of various admixtures and interactions such as the J-mixing, the mixtures among the states with the same J-value, and the covalence are all considered. The calculated results are in reasonable agreement with the observed values. The results are discussed.

  13. Two new diterpenoids from Leonotis leonurus R. Br.

    Science.gov (United States)

    Narukawa, Yuji; Komori, Miyuki; Niimura, Akiko; Noguchi, Hitomi; Kiuchi, Fumiyuki

    2015-01-01

    Two new diterpenoids, 14α-hydroxy-9α,13α-epoxylabd-5(6)-en-7-on-16,15-olide (1) and 13ξ-hydroxylabd-5(6),8(9)-dien-7-on-16,15-olide (2) along with six known diterpenoids were isolated from the aerial parts of Leonotis leonurus R. Br. These structures were determined on the basis of spectroscopic analyses. Some of the isolated compounds showed weak to moderate estrogen sulfotransferase inhibitory activity.

  14. Structural and magnetic properties of Dy2Co17-xMnx compounds

    Institute of Scientific and Technical Information of China (English)

    李云宝; 张立刚; 张绍英; 沈保根

    2002-01-01

    Using x-ray diffraction and magnetic measurements, we have studied the structural and magnetic properties ofDy2Co17-xMnx (x=0~5) compounds with a rhombohedral Th2Zn17-type structure. With an increasing Mn concen-tration x, the unit-cell volume V was found to increase linearly. The Curie temperature TC decreases linearly, andthe saturation magnetization Ms at 5K first increases slightly for x <1, then decreases rapidly for x >1 with a furtherincrease of Mn concentration x. In compounds for x=1~3, a spin reorientation was found. A magnetic diagram of thecompounds is given.

  15. Thermal expansion in dysprosium tungstate Dy10W2O21

    Institute of Scientific and Technical Information of China (English)

    2002-01-01

    The complex oxide Dy10W2O21 was synthesized by a solid-state reaction and isolated in cubic symmetry by an X-ray diffractometry (XRD) method. Differential scanning calorimetry (DSC) measurements show that the compound is thermodynamically stable. The intrinsic thermal expansion coefficients were determined by extra-power powder Xray diffractometry from room temperature to 1000 ℃: linear coefficient α = 1.07 × 10-5 ℃-1 and bulk coefficient β=3.20 × 10-5℃-1. Dilatometry was used to measure the extrinsic thermal expansion coefficient (9.2 × 10-6℃-1).

  16. Ground state and magnetic phase transitions of orthoferrite DyFeO_3

    OpenAIRE

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

    2014-01-01

    Low-temperature thermal conductivity (\\kappa), as well as magnetization (M) and electric polarization (P), of multiferroic orthoferrite DyFeO_3 single crystals are studied with H \\parallel c. When the crystal is cooled in zero field, M, P, and \\kappa all consistently exhibit irreversible magnetic-field dependencies. In particular, with 500 mK < T \\le 2 K, all these properties show two transitions at the first run of increasing field but only the higher-field transition is present in the subse...

  17. Thermodynamic Assessment of DyCl3-MCl (M=Na, K, Rb, Cs) Systems

    Institute of Scientific and Technical Information of China (English)

    2007-01-01

    Using the CALPHAD (Calculation of Phase Diagram) technique, the DyCl3-MCl (M=Na, K, Rb, Cs) systems were optimized and calculated. The modified quasi-chemical model in the pair approximation for short-range ordering was used to describe the Gibbs energies of the liquid phase in these systems. From the measured phase diagram data and experimental thermodynamic properties, a series of thermodynamic functions were optimized base on an interactive computer-assisted analysis. The optimized parameters and the experimental data were thermodynamically self-consistent. The optimized results were discussed.

  18. 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.

  19. Effect of pressure on the metamagnetic transition of DyB6 single crystal

    International Nuclear Information System (INIS)

    The effects of pressure on the magnetization (M) and the magnetostriction (MS) for DyB6 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 M in the M curve increases slightly by applying pressure with the rate of increase, ∂ ln H M/∂P, of 0.03 GPa-1, which is almost the same value as that for T N, 0.04 GPa-1

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

    Indian Academy of Sciences (India)

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

    2002-05-01

    A pronounced peak in the microwave (at frequency 9.55 GHz) surface resistance, s vs. plot (where is the temperature) has been observed in epitaxial DyBa2Cu3O7- superconducting thin films in magnetic fields (parallel to -axis) in the range 2 to 8 kOe, and temperatures close to the superconducting transition temperature c(). Our data suggest that the nature of peaks observed in the two films is different, thereby indicating different defect structures in the films.