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Sample records for er yt dy

  1. Beta-delayed proton activities: 147Dy and 149Er

    International Nuclear Information System (INIS)

    Toth, K.S.; Moltz, D.M.; Schloemer, E.C.; Cable, M.D.; Avignone, F.T. III; Ellis-Akovali, Y.A.

    1984-01-01

    The present paper discusses mainly the β-delayed proton spectra of 147 Dy and of the hitherto unknown isotope, 149 Er. However, following the submittal of the abstract for this conference we have now observed delayed protons following the decay of 145 Dy. Additionally, we have identified a 0.5-s delayed-proton emitter and tentatively assign it to the new isotope, 151 Yb

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

    International Nuclear Information System (INIS)

    Azgui, F.

    1985-01-01

    Measurements of feeding times of high spin yrast states in 152 Dy, 154 Dy and 156 Er 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 152 Dy 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 154 Dy 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 156 Er 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 [fr

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

    International Nuclear Information System (INIS)

    Wang, Jinsan; Li, Changrong; Guo, Cuiping; Du, Zhenmin; Wu, Bo

    2013-01-01

    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 3 Er 5 , BiEr, Bi 3 Dy 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

  4. 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...

  5. A2TiO5 (A = Dy, Gd, Er, and Yb) at high pressure

    Energy Technology Data Exchange (ETDEWEB)

    Park, Sulgiye; Rittman, Dylan; Tracy, Cameron L.; Chapman, Karena W.; Zhang, Fuxiang; Park, Changyong; Tkachev, Sergey N.; O' Quinn, Eric; Shamblin, Jacob; Lang, Maik; Mao, Wendy L.; Ewing, Rodney C.

    2018-02-01

    The structural evolution of lanthanide A2TiO5 (A = Dy, Gd, Yb, and Er) at high pressure is investigated using synchrotron X-ray diffraction. The effects of A-site cation size and of the initial structure are systematically examined by varying the composition of the isostructural lanthanide titanates, and the structure of dysprosium titanate polymorphs (orthorhombic, hexagonal and cubic), respectively. All samples undergo irreversible high pressure phase transformations, but with different onset pressures depending on the initial structure. While individual phase exhibits different phase transformation histories, all samples commonly experience a sluggish transformation to a defect cotunnite-like (Pnma) phase for a certain pressure range. Orthorhombic Dy2TiO5 and Gd2TiO5 form P21am at pressures below 9 GPa and Pnma above 13 GPa. Pyrochlore-type Dy2TiO5 and Er2TiO5 as well as defect-fluorite-type Yb2TiO5 form Pnma at ~ 21 GPa, followed by Im-3m. Hexagonal Dy2TiO5 forms Pnma directly, although a small amount of remnants of hexagonal Dy2TiO5 is observed even at the highest pressure (~ 55 GPa) reached, indicating a kinetic limitations in the hexagonal Dy2TiO5 phase transformations at high pressure. Decompression of these materials leads to different metastable phases. Most interestingly, a high pressure cubic X-type phase (Im-3m) is confirmed using highresolution transmission electron microscopy on recovered pyrochlore-type Er2TiO5. The kinetic constraints on this metastable phase yield a mixture of both the X-type phase and amorphous domains upon pressure release. This is the first observation of an X-type phase for an A2BO5 composition at high pressure.

  6. The normal and inverse magnetocaloric effect in RCu2 (R=Tb, Dy, Ho, Er) compounds

    International Nuclear Information System (INIS)

    Zheng, X.Q.; Xu, Z.Y.; Zhang, B.; Hu, F.X.; Shen, B.G.

    2017-01-01

    Orthorhombic polycrystalline RCu 2 (R=Tb, Dy, Ho and Er) compounds were synthesized and the magnetic properties and magnetocaloric effect (MCE) were investigated in detail. All of the RCu 2 compounds are antiferromagnetic (AFM) ordered. As temperature increases, RCu 2 compounds undergo an AFM to AFM transition at T t and an AFM to paramagnetic (PM) transition at T N . Besides of the normal MCE around T N , large inverse MCE around T t was found in TbCu 2 compound. Under a field change of 0–7 T, the maximal value of inverse MCE is even larger than the value of normal MCE around T N for TbCu 2 compound. Considering of the normal and inverse MCE, TbCu 2 shows the largest refrigerant capacity among the RCu 2 (R=Tb, Dy, Ho and Er) compounds indicating its potential applications in low temperature multistage refrigeration. - Highlights: • Large inverse magnetocaloric effect is observed in TbCu 2 compound. • The AFM to AFM transition is observed in RCu 2 (R=Tb, Dy, Ho, Er) compounds. • The MCE performance of TbCu 2 compound is evaluated in a more comprehensively way.

  7. Tris ammonium rare earth(III) hexafluoro complexes (RE=Dy, Ho and Er)

    International Nuclear Information System (INIS)

    Wani, B.N.; Rao, U.R.K.

    1993-01-01

    Ammonium fluoro complex of yttrium was synthesised by heating a mixture of Y 2 O 3 and NH 4 HF 2 in 1:6 ratio at 150 degC and on heating the above complex at 300-400 degC YF 3 is obtained. To know the actual course of decomposition Patwe et al (1989) have prepared, identified and characterised the complexes (NH 4 ) 3 REF 6 1.5H 2 O where RE=Y, La, Ce, Nd and Pr. In the present communication an attempt was made to synthesis and study the thermal behaviour of ammonium fluoro complexes of Dy, Ho and Er. (author). 2 refs., 1 fig., 1 tab

  8. Magnetic structures of Er6Mn23 and Dy6Mn23

    International Nuclear Information System (INIS)

    Ouladdiaf, B.; Deportes, J.; Rodriguez-Carvajal, J.

    1995-01-01

    The R 6 Mn 23 (R=rare earth) compounds crystallize in the cubic Th 6 Mn 23 -type structure with space group Fm3m. Powder neutron-diffraction experiments were performed on Dy 6 Mn 23 and Er 6 Mn 23 . The magnetic unit cell coincides with the chemical one. The R moments have a ferromagnetic non-collinear arrangement, whereas the Mn moments are parallel to the [1 1 1] direction. The magnetic structures belong to the three-dimensional Γ 5g irreducible representation of Fm3m associated with the wave vector K=[0 0 0]. The spin configurations in both compounds result from the competition between the R-R, R-Mn magnetic interactions and the crystal electric field on the R ions. (orig.)

  9. Exchange bias properties in Sr2LnRuO6 (Ln  =  Dy, Ho and Er)

    Science.gov (United States)

    Mohanty, Prachi; Marik, Sourav; Singh, Deepak; Singh, Ravi P.

    2017-12-01

    Herein, we report the exchange bias effect in Sr2 LnRuO6 (Ln  =  Dy, Ho and Er) compounds. These ruthenium-based double perovskite compounds exhibited the exchange bias effect below their AFM ordering temperatures when they cooled in the presence of a magnetic field. Detailed magnetization measurements indicate that the exchange bias properties may associate with the Dzyaloshinskii–Moria (D–M) interactions originated due to the low crystallographic symmetry in these system types.

  10. Slik bør du trene hvis du har høyt blodtrykk

    DEFF Research Database (Denmark)

    Bjørkelund, Oline Anita

    2016-01-01

    Svært mange nordmenn lever med lavt eller høyt blodtrykk. Sistnevnte er et utbredt helseproblem i Norge, og Nasjonalforeningen for folkehelsen opplyser at over 100 000 nordmenn bruker medisiner mot det. Høyt blodtrykk er jo ingen sykdom i seg selv, men det krever at man må tenke gjennom vaner og ...

  11. The normal and inverse magnetocaloric effect in RCu{sub 2} (R=Tb, Dy, Ho, Er) compounds

    Energy Technology Data Exchange (ETDEWEB)

    Zheng, X.Q., E-mail: zhengxq@ustb.edu.cn [School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083 (China); Xu, Z.Y. [National Institute of Metrology, Beijing 100029 (China); Zhang, B.; Hu, F.X. [State Key Laboratory for Magnetism, Institute of Physics, Chinese Academy of Sciences, Beijing 100190 (China); Shen, B.G., E-mail: shenbg@aphy.iphy.ac.cn [State Key Laboratory for Magnetism, Institute of Physics, Chinese Academy of Sciences, Beijing 100190 (China)

    2017-01-01

    Orthorhombic polycrystalline RCu{sub 2} (R=Tb, Dy, Ho and Er) compounds were synthesized and the magnetic properties and magnetocaloric effect (MCE) were investigated in detail. All of the RCu{sub 2} compounds are antiferromagnetic (AFM) ordered. As temperature increases, RCu{sub 2} compounds undergo an AFM to AFM transition at T{sub t} and an AFM to paramagnetic (PM) transition at T{sub N}. Besides of the normal MCE around T{sub N}, large inverse MCE around T{sub t} was found in TbCu{sub 2} compound. Under a field change of 0–7 T, the maximal value of inverse MCE is even larger than the value of normal MCE around T{sub N} for TbCu{sub 2} compound. Considering of the normal and inverse MCE, TbCu{sub 2} shows the largest refrigerant capacity among the RCu{sub 2} (R=Tb, Dy, Ho and Er) compounds indicating its potential applications in low temperature multistage refrigeration. - Highlights: • Large inverse magnetocaloric effect is observed in TbCu{sub 2} compound. • The AFM to AFM transition is observed in RCu{sub 2} (R=Tb, Dy, Ho, Er) compounds. • The MCE performance of TbCu{sub 2} compound is evaluated in a more comprehensively way.

  12. Rare Earth Dopant (Nd, Gd, Dy, and Er Hybridization in Lithium Tetraborate

    Directory of Open Access Journals (Sweden)

    Tony D. Kelly

    2014-05-01

    Full Text Available The four dopants (Nd, Gd, Dy, and Er substitutionally occupy the Li+ sites in lithium tetraborate (Li2B4O7: RE glasses as determined by analysis of the extended X-ray absorption fine structure. The dopants are coordinated by 6-8 oxygen at a distance of 2.3 to 2.5 Å, depending on the rare earth. The inverse relationship between the RE¬ O coordination distance and rare earth (RE atomic number is consistent with the expected lanthanide atomic radial contraction with increased atomic number. Through analysis of the X-ray absorption near edge structure, the rare earth dopants adopt the RE3+ valence state. There are indications of strong rare earth 5d hybridization with the trigonal and tetrahedral formations of BO3 and BO4 based on the determination of the rare earth substitutional Li+ site occupancy from the X-ray absorption near edge structure data. The local oxygen disorder around the RE3+ luminescence centers evident in the structural determination of the various glasses, and the hybridization of the RE3+ dopants with the host may contribute to the asymmetry evident in the luminescence emission spectral lines. The luminescence emission spectra are indeed characteristic of the expected f-to-f transitions; however, there is an observed asymmetry in some emission lines.

  13. Poikkeavat tapahtumat säteilyn lääketieteellisessä käytössä eräässä yliopistollisessa sairaalassa

    OpenAIRE

    Manninen, Susanna; Anttila, Tuija

    2014-01-01

    Poikkeavien tapahtumien ilmoittaminen ja raportointi ovat tärkeä osa säteilyturvallisuutta. TT-tutkimusmäärien kasvaessa säteilyn käyttö ja sen myötä myös säteilyn aiheuttamat haitat lisääntyvät. Röntgenhoitajan työssä turvallisuusnäkökohtiin tulisi kiinnittää entistä enemmän huomiota. Poikkeavista tapahtumista ilmoittaminen ja raportoiminen perustuvat sekä säteilylakiin 592/1991 että säteilyasetukseen 1512/1991. Tutkimuksen tarkoitus on kuvailla erään yliopistollisen sairaalan kuvantamis...

  14. Anisotropy in the paramagnetic phase of RAl/sub 2/ cubic intermetallic compounds (R = Tb, Dy, and Er)

    Energy Technology Data Exchange (ETDEWEB)

    del Moral, A.; Ibarra, M.R.; Abell, J.S.; Montenegro, J.F.D.

    1987-05-01

    In this paper it is shown that the anisotropy in the paramagnetic phase is a useful characteristic when used to single out high-rank susceptibility tensor components in the paramagnetic regime of cubic crystals. Application of this technique to RAl/sub 2/ compounds (R = Tb,Dy,Er) allows the determination of longitudinal and transverse (in the form of linear combinations) fourth- and sixth-rank paramagnetic susceptibilities. The use of the fourth-rank longitudinal susceptibility allows quadrupolar pair interactions in these compounds to be probed.

  15. Study of X-ray L2 absorption edges of Gd, Dy, Ho and Er in metals and compounds

    International Nuclear Information System (INIS)

    Agarwal, B.K.; Agarwal, B.R.K.

    1978-01-01

    The positions and shapes of L2 X-ray absorption edges of Gd, Dy, Ho and Er have been studied in metals and in oxides and chlorides, using a forty centimetre bent mica crystal spectrograph. It has been found that the L2 edge shifts towards the high energy side in the compounds and that the chemical shift ΔE depends on the degree of covalency involved. The white line structure at the edge has been analysed in terms of transitions of L2 shell electron to optical nd (n >= 5) states. (author)

  16. Magnetic-luminescent YbPO4:Er,Dy microspheres designed for tumor theranostics with synergistic effect of photodynamic therapy and chemotherapy.

    Science.gov (United States)

    Wang, Wei; Xu, Dong; Wei, Xiaojun; Chen, Kezheng

    2014-01-01

    In this paper, magnetic and fluorescent bifunctional YbPO4:Er,Dy microspheres were synthesized via a simple solvothermal method. The prepared microspheres exposed to 980 nm near-infrared (NIR) laser light emitted bright upconversion fluorescence (450-570 nm) after calcination at high temperatures (>800°C). Results of magnetic resonance studies demonstrated that the YbPO4:Er,Dy microspheres are more suitable to be used as a transverse relaxation time (negative) contrast magnetic resonance imaging agent. The microspheres successfully entered the human hepatocellular carcinoma cells and presented low toxicity. A well-selected photodynamic therapy (PDT) drug, merocyanine 540 (MC540) with an ultraviolet-visible spectroscopy absorption maximum of 540 nm, was loaded onto the microspheres to obtain YbPO4:Er,Dy-MC540. Since the upconversion fluorescence emitting from the microspheres could be absorbed by MC540 with a small absorption/emission disparity, YbPO4:Er,Dy-MC540 could kill the hepatocellular carcinoma cells via PDT mechanism effectively. In other words, being upconverting particles, the prepared microspheres acted as light transducers in the NIR light-triggered PDT process. A chemotherapy drug, doxorubicin, was further loaded onto YbPO4:Er,Dy-MC540 to achieve enhanced antitumor effect based on synergistic therapeutic efficacy of PDT and chemotherapy. It is expected that the prepared YbPO4:Er,Dy microspheres have applications in tumor theranostics including magnetic-fluorescent bimodal imaging and NIR light-triggered PDT.

  17. Magnetic structures of Er{sub 6}Mn{sub 23} and Dy{sub 6}Mn{sub 23}

    Energy Technology Data Exchange (ETDEWEB)

    Ouladdiaf, B. [Institut Max von Laue - Paul Langevin, 38 - Grenoble (France); Deportes, J. [Laboratoire de Magnetisme L. Neel, C.N.R.S., BP 166, 38042 Grenoble Cedex 9 (France); Rodriguez-Carvajal, J. [Institut Max von Laue - Paul Langevin, 38 - Grenoble (France)]|[Laboratoire Leon Brillouin (CEA-CNRS), Centre d`Etudes de Saclay, Gif sur Yvette (France)

    1995-08-01

    The R{sub 6}Mn{sub 23} (R=rare earth) compounds crystallize in the cubic Th{sub 6}Mn{sub 23}-type structure with space group Fm3m. Powder neutron-diffraction experiments were performed on Dy{sub 6}Mn{sub 23} and Er{sub 6}Mn{sub 23}. The magnetic unit cell coincides with the chemical one. The R moments have a ferromagnetic non-collinear arrangement, whereas the Mn moments are parallel to the [1 1 1] direction. The magnetic structures belong to the three-dimensional {Gamma}{sub 5g} irreducible representation of Fm3m associated with the wave vector K=[0 0 0]. The spin configurations in both compounds result from the competition between the R-R, R-Mn magnetic interactions and the crystal electric field on the R ions. (orig.).

  18. Determination of Tb, Dy, Ho, Er and Yb in ores and concentrates by ICP-OES method

    International Nuclear Information System (INIS)

    Kanicky, V.; Toman, J.; Malecek, M.

    1988-01-01

    Optical emission spectroscopy was used (OES) to analyse apatite from the Kola peninsula with a total content of 0.9% oxides of heavy rare earth elements, the hydroxide concentrate of apatite, the oxide concentrate of rare earth elements, bastnaesite minerals and raw materials containing monasite. Measurements were made with a PV 8210/8280 spectrometer (width of spectral interval in the 1st order of the spectrum 0.028 mm) and an ICP PV 8490 generator. The spectra were measured of 19 most sensitive analytical lines of heavy rare earth elements (8 Tb, 3 Dy, 1 Ho, 3 Er, 4 Yb). The mutual interferences of the different elements, detection limits and resolution limits were determined. The results of the determination of rare earth elements and of certain general elements in the analysed raw materials are tabulated. (E.S.). 2 figs., 11 tabs., 10 refs

  19. Competition of superconductivity and antiferromagnetism in RNi{sub 2}B{sub 2}C (R = Tm, Dy, Ho, Er)

    Energy Technology Data Exchange (ETDEWEB)

    Sahoo, B.K., E-mail: basanta@iopb.res.in [Govt. College (Auto.), Angul, Odisha 759143 (India); Panda, B.N. [K.K. Junior College, Berhampur, Odisha 760001 (India)

    2015-06-15

    Highlights: • Hamiltonian model to study SC and AFM in RNi{sub 2}B{sub 2}C. • A competition between SC and AFM. - Abstract: The co-existence of superconductivity (SC) and antiferromagnetism (AFM) in RNi{sub 2}B{sub 2}C (R = Tm, Dy, Ho, Er) is reported in this paper. A mean field Hamiltonian model is taken for the system. The order parameters corresponding to SC and AFM are determined and their variation with temperature are studied for these borocarbide superconductors. The interplay of SC and AFM shows BCS type of two gaps in the quasi-particle density of states. Our theoretical study is an attempt to reveal how far the s-wave pairing taken in our model could explain the coexistence properties of SC and AFM in RNi{sub 2}B{sub 2}C.

  20. Magnetic properties and magnetocaloric effect in the R{sub 2}PdSi{sub 3} (R = Gd, Dy and Er) compounds

    Energy Technology Data Exchange (ETDEWEB)

    Mo, Zhao Jun, E-mail: mozhaojun@iphy.ac.cn [School of Material Science and Engineering, Tianjin University of Technology, Tianjin (China); Key Laboratory of Cryogenics, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing (China); Shen, Jun, E-mail: jshen@mail.ipc.ac.cn [Key Laboratory of Cryogenics, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing (China); Gao, Xin Qiang [Key Laboratory of Cryogenics, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing (China); Liu, Yao [State Key Laboratory of Magnetism, Beijing National Laboratory for Condensed Matter, Physics and Institute of Physics, Chinese Academy of Sciences, Beijing (China); Tang, Cheng Chun [School of Material Science and Engineering, Hebei University of Technology, Tianjin (China); Wu, Jian Feng [Key Laboratory of Cryogenics, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing (China); Hu, Feng Xia; Sun, Ji Rong; Shen, Bao Gen [State Key Laboratory of Magnetism, Beijing National Laboratory for Condensed Matter, Physics and Institute of Physics, Chinese Academy of Sciences, Beijing (China)

    2015-03-25

    Highlights: • Er{sub 2}PdSi{sub 3} compound exhibits a giant reversible MCE. • Er{sub 2}PdSi{sub 3} compound’s MCEs show no thermal and magnetic hysteresis. • Under field changes of 2 T, the value of -ΔS{sub M}{sup max} is 14.5 J/kg K and the RC is 111 J/kg, respectively. - Abstract: The magnetic properties and magnetocaloric effect in R{sub 2}PdSi{sub 3} (R = Dy, Dy and Er) compounds have been investigated. All these compounds possess an antiferromagnetic (AFM)-paramagnetic (PM) transition around their respective Néel temperatures. And, it is found that the Dy{sub 2}PdSi{sub 3} and Er{sub 2}PdSi{sub 3} compounds undergo a spin-glass behavior below Néel temperature. Under the magnetic field change of 5 T, the values of -ΔS{sub M}{sup max} reach 11.8 J/kg K for Gd{sub 2}PdSi{sub 3}, 16.6 J/kg K for Dy{sub 2}PdSi{sub 3} and 22 J/kg K for Er{sub 2}PdSi{sub 3}, respectively. Especially, the values of -ΔS{sub M}{sup max} in the Er{sub 2}PdSi{sub 3} compound are 8 and 14.5 J/kg K for field change of 1 and 2 T, which is attributed to a field-induced metamagnetic transition from AFM to FM states. The large reversible -ΔS{sub M} and large RC together with the absence of thermal and field hysteresis indicate that Er{sub 2}PdSi{sub 3} compound could be a promising candidate for magnetic refrigeration at low temperatures.

  1. Measurement of formation cross sections of short-lived nuclei by 14 MeV neutron. Nd, Sm, Dy, Er, Yb

    Energy Technology Data Exchange (ETDEWEB)

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

    1997-03-01

    Eight neutron activation cross sections producing the nuclei with half-lives between 3 min and 24 min were obtained at the energy range between 13.4 and 14.9 MeV by activation method. The cross sections were {sup 146}Nd(n,p){sup 146}Pr, {sup 154}Sm(n,{alpha}){sup 151}Nd, {sup 162}Dy(n,p){sup 162}Tb, {sup 163}Dy(n,np){sup 162}Tb, {sup 163}Dy(n,p){sup 163}Tb, {sup 164}Dy(n,p){sup 164}Tb, {sup 170}Er(n,{alpha}){sup 167}Dy, {sup 174}Yb(n,p){sup 170}Tm. {sup 163}Dy(n,np){sup 162}Tb (T{sub 1/2}=7.7 min) was obtained for the first time. Present results are compared with previous results and the evaluated data of JENDL-3 and ENDF/B-VI. There are some discrepancies between present results and the JENDL-3 and ENDF/B-VI. (author)

  2. Síntesis hidrotermal de monocristales LnMn2O5 (Ln= Y, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho y Er

    Directory of Open Access Journals (Sweden)

    Señarís Rodríguez, M. A.

    2008-08-01

    Full Text Available Ten single crystals of the series LnMn2O5 (Ln= Y, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho and Er were synthesized by hydrothermal synthesis in a single step and without subsequent thermal treatments from aqueous solutions of metals salts at 240 ºC. The obtained single crystals have a size of various micrometers and their morphology changes throughout the serie: they are polygonal in the case of the compounds with Ln= Pr, Nd, Sm, Eu and Gd and needle-like in the case of the compounds with Ln= Y, Tb, Dy, Ho and Er. After the analysis of the obtained products employing different conditions of synthesis we attributed the different morphology to a greater growth rate along the c axis when the smaller ions (Y, Tb, Dy, Ho y Er are involved, due to their better adaptation to the compound’s crystal structure.Se han conseguido preparar monocristales de 10 óxidos mixtos de la serie LnMn2O5 (Ln= Y, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho y Er mediante síntesis hidrotermal optimizada, en un único paso y sin tratamientos térmicos posteriores partiendo de las correspondientes sales metálicas en disolución acuosa a 240 ºC. Los monocristales obtenidos son relativamente grandes, de varias micras y su morfología varía a lo largo de la serie: es poligonal en el caso de los compuestos de los lantánidos del inicio de la serie (Ln= Pr, Nd, Sm, Eu y Gd y acicular en el caso de los compuestos de Y y de los lantánidos del final de la serie (Ln= Tb, Dy, Ho y Er. Tras el análisis de los productos obtenidos empleando distintas condiciones de síntesis atribuimos la diferente morfología a una mayor velocidad de crecimiento cristalino a lo largo del eje c cuando intervienen los iones más pequeños (Y, Tb, Dy, Ho y Er debido a la mejor adaptación de éstos últimos a la estructura cristalina del compuesto.

  3. Crystal fields in Sc, Y, and the heavy-rare-earth metals Tb, Dy, Ho, Er, Tm, and Lu

    International Nuclear Information System (INIS)

    Touborg, P.

    1977-01-01

    Experimental investigations of the magnetic poperties 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 parameters for all these 15 alloy systems deduced. The consistency of the parameters was confirmed by a variety of magnetic measurements, including neutron spectroscopy. Crystal-field parameters have also been derived for the ions in pure magnetic rare-earth metals and their alloys using the results for the dilute alloys supplemented with paramagnetic measurements up to high temperatures on the concentrated systems. Mean values and standard deviations of the higher-order crystal-field parameters for all Y and Lu alloys are B 40 /β = 6.8 +- 0.9 K, B 60 /γ = 13.6 +- 0.7 K, and B 66 /γ = (9.7 +- 1.1) B 60 /γ. These values: with the inaccuracies somewhat increased: are expected to be representative also for the magnetic rare-earth metals. For rare-earth ions in the Sc host the values B 40 /β = 9.9 +- 1.9 K, B 60 /γ = 19.8 +- 1.5 K, and B 66 /γ = (9.4 +- 0.9) B 60 /γ were deduced. B 20 /α is a host-sensitive parameter which has the average values of -102.7, -53.4, and 29.5 K for rare-earth ions in Y, Lu, and Sc, respectively. There is also evidence that this parameter varies with the solute. B 20 /α for ions in the pure magnetic rare-earth metals and their alloys shows a linear variation with c/a ratio characteristic of each ion. The 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

  4. Subsolidus Phase Relations of the CaO-REOx-CuO Systems (RE = Eu, Tb, Dy, Ho, Er, Lu and Sc) at 900 °C in Air

    DEFF Research Database (Denmark)

    Grivel, Jean-Claude

    2016-01-01

    The subsolidus phase relations of the CaO-REOx-CuO systems (RE = Eu, Tb, Dy, Ho, Er, Lu and Sc) were investigated in air at 900 °C. The pseudo-ternary sections with RE = Tb, Dy, Ho, Er and Lu have a similar structure. They have in common with the RE = Eu system a solid solution of Ca0.833−xRExCuO2......+y composition but the system with RE = Eu differs by the presence of an Eu2CuO4 phase instead of RE2Cu2O5 for RE = Tb, Dy, Ho, Er and Lu. In contrast, the CaO-ScO1.5-CuO section does not contain a Ca0.833−xScxCuO2+y solid solution and is dominated by the CaSc2O4 phase, which has no equivalent...... in the other systems at 900 °C in air....

  5. Strong paramagnetic crystalline LnVO{sub 4} (Ln: Gd, Tb, Dy, Ho, Er) nanoparticles synthesized by a fabricating method

    Energy Technology Data Exchange (ETDEWEB)

    Bulbul, Berna; Beyaz, Seda, E-mail: sedacan@balikesir.edu.tr

    2016-04-15

    Strong paramagnetic lanthanide orthovanadate (LnVO{sub 4}, Ln: Gd, Tb, Dy, Ho, Er) nanoparticles were synthesized under ambient conditions by a novel precipitation method that is economical and fabricating. To the X-ray diffraction patterns, all samples are well-crystallized zircon type orthovanadate and have pure tetragonal phase. Their crystal sizes increased from 12.58 to 15.12 nm with increasing the ionic radii of lanthanide. As confirmed with the surface observation by a transmission electron microscope, it was identified that their two-dimensional projection is an ellipse with the two major axes. It was seen that the sizes of nanoparticles (14.40nm-70.69 nm) were bigger than the crystal sizes because of their polycrystalline structures. Besides, the particle sizes increased with reduction of ionic radii of lanthanide. The magnetic properties obtained from a vibrating sample magnetometer revealed that all nanoparticles are strong paramagnetic at room temperature showing an increase in molar susceptibility up to 4.79 × 10{sup −1} cm{sup 3} mol{sup −1}. Such highly crystalline, small and paramagnetic nanoparticles could be thought to be convenient for biomedical applications. - Highlights: • A general fabricating method for lanthanide orthovanadate nanoparticles is proposed. • The method generates highly small and crystalline nanoparticles. • The reduction in ionic radius of lanthanide (Ln{sup 3+}) causes to increase particle size.

  6. Crystal structure of RCoIn5 (R - Ce, Pr, Nd, Sm, Gd, Tb, Dy, Ho, Y) and R2CoIn8 (R - Ce, Pr, Nd, Sm, Gd, Dy, Ho, Er, Tm, Y) compounds

    International Nuclear Information System (INIS)

    Kalychak, Ya.M.; Zaremba, V.I.; Baranyak, V.M.; Bruskov, V.A.; Zavalij, P.Yu.

    1989-01-01

    Usng X-ray diffraction method of monocrystal, crystal structure of HoCoIn 5 compound belonging to the HoCoGa 5 structural type is determined. Using the method of powder belonging of CeCoIn 5 structure to the HoCoGa 5 structural type is confirmed. Isostructural compounds with Y, Pr, Nd, Sm, Gd, Tb, Dy are detected. Their lattice periods are determined. Using the method of powder belonging of Ce 2 CoIn 8 compound structure to Ho 2 CoGa 8 structural type is determined. Isostructural compounds with Y, Pr, Nd, Sm, Gd, Dy, Ho, Er, Tm are detected and their lattice periods are determined

  7. Rhodium-rich silicides RERh{sub 6}Si{sub 4} (RE=La, Nd, Tb, Dy, Er, Yb)

    Energy Technology Data Exchange (ETDEWEB)

    Vosswinkel, Daniel; Poettgen, Rainer [Muenster Univ. (Germany). Inst. fuer Anorganische und Analytische Chemie

    2017-07-01

    Polycrystalline RERh{sub 6}Si{sub 4} (RE=La, Nd, Tb, Dy, Er, Yb) samples can be synthesized by arc-melting of the elements. Single crystals of LaRh{sub 6}Si{sub 4}, NdRh{sub 6}Si{sub 4} and YbRh{sub 6}Si{sub 4} were synthesized from the elements in bismuth fluxes (non-reactive flux medium). The structures were refined on the basis of single-crystal X-ray diffractometer data: LiCo{sub 6}P{sub 4} type, P anti 6m2, a=700.56(3), c=380.55(1) pm, wR2=0.0257, 317 F{sup 2} values, 19 variables for LaRh{sub 6}Si{sub 4}, a=698.4(5), c=377.7(2) pm, wR2=0.0578, 219 F{sup 2} values, 19 variables for NdRh{sub 6}Si{sub 4} and a=696.00(3), c=371.97(1) pm, wR2=0.0440, 309 F{sup 2} values, 19 variables for YbRh{sub 6}Si{sub 4}. The rhodium and silicon atoms build up three-dimensional, covalently bonded [Rh{sub 6}Si{sub 4}]{sup δ-} polyanionic networks with Rh-Si distances ranging from 239 to 249 pm. The rare earth atoms fill larger cavities within channels of these networks and they are coordinated by six silicon and twelve rhodium atoms in the form of hexa-capped hexagonal prisms.

  8. Near-infrared quantum cutting of Dy3+, Ho3+-Yb3+ and Er3+-Yb3+-doped Ca10K(PO4)7 phosphors

    Science.gov (United States)

    Zhang, Jia; Jiang, Cheng

    2014-05-01

    Dy3+, Ho3+-Yb3+ and Er3+-Yb3+-doped Ca10K(PO4)7 phosphors were prepared by solid-state reaction method, and their luminescence properties of near-infrared (NIR) quantum cutting (QC) were investigated for the first time. The Rietveld refinement performed for the X-ray diffractometer (XRD) data indicates the obtained samples are single-phase. From the excitation spectra, it can be seen that the energy transfers from Ho3+ to Yb3+, and from Er3+ to Yb3+ occur. The Dy3+, Ho3+-Yb3+ and Er3+-Yb3+ co-doped Ca10K(PO4)7 samples all exhibit NIR emission peaks in the QC processes, and their spectral characteristics are agreement with the corresponding NIR QC mechanisms. The NIR QC properties of the as-prepared samples indicate the potential applications in modifying the solar spectrum to enhance the efficiency of silicon solar cells.

  9. Preparation and dielectric properties of Dy, Er-doped BaZr0.2Ti0.8O3 ceramics

    International Nuclear Information System (INIS)

    Hao Sue; Sun Liang; Huang Jinxiang

    2008-01-01

    Ba(Zr x Ti 1-x )O 3 nanopowders and ceramics with different Zr/Ti ratios of 1:9; 2:8; 2.5:7.5; 3.5:6.5 and 4:6 (x = 0.1, 0.2, 0.25, 0.35, 0.4) have been prepared by sol-gel technology using inorganic zirconium as raw materials, and Zr/Ti ratio of 2:8 is determined as the best one according to the measurements of dielectric properties. So the modified Ba(Zr 0.2 ,Ti 0.8 )O 3 ceramics doped by Dy and Er (the additive content is 0.10%, 0.15%, 0.20%, 0.30% and 0.50% molar ratio, respectively) have been prepared, and the effects of rare earth on the microstructure and dielectric properties of Ba(Zr 0.2 ,Ti 0.8 )O 3 ceramics have been studied. The experimental results show that the effect of Er is better than that of Dy in improving the dielectric properties of BaZr 0.2 Ti 0.8 O 3 ceramics. When the content of Er is 0.15 mol%, the dielectric constant is the highest of 12767, while the dielectric loss is lowered to 0.011; the frequency stabilities and the temperature dependence are also better, which is suitable for application in condenser field

  10. Crystal structure and superconductivity of LnBa2Cu4O8(Ln = Ho, Er, Y, Dy and Gd) superconductors

    International Nuclear Information System (INIS)

    Ishigaki, Toru; Mori, Kazuya; Kawaguchi, Yasuhiro; Hamaguchi, Yoshikazu; Katano, Susumu; Funahashi, Satoru.

    1993-01-01

    Bulk Superconductors of LnBa 2 Cu 4 O 8 (Ln =Er, Ho, Y, Dy and Gd) which share the 124 structure of YBa 2 Cu 4 O 8 were synthesized by using hot isostatic pressing (HIP) treatment. The crystal structure at room temperature was refined from the neutron and X-ray powder diffraction data by Rietveld analysis. T c of our samples are showed monotonous decreasing from highest 84.1 K (Ln = Er) to 77.3 K (Ln = Gd) following the ionic radius. Madelung energy calculation from refined structural parameters show the hole concentration on CuO 2 plane. These results show that the substitution of lanthanoide elements to Y site of YBa 2 Cu 4 O 8 induce 'chemical pressure' effect. (author)

  11. Positron annihilation studies in high-Tc superconductors RBa2Cu3Oy, R: La, Nd, Sm, Eu, Gd, Dy, Ho, Y, Er

    International Nuclear Information System (INIS)

    Lagouri, T.; Dedoussis, S.; Chardalas, M.; Liolios, A.

    1997-01-01

    Positron lifetime and Doppler broadening of the annihilation line measurements have been performed at room temperature in high-T c superconductors RBa 2 Cu 3 O y , where R: La, Nd, Sm, Eu, Gd, Dy, Ho, Y, Er and 6.9 c superconducting samples RBa 2 Cu 3 O y , where R: Nd, Sm, Eu, Ho, Y, Er as a function of temperature between 14 K and 293 K. It was observed that the positron lifetime and the S parameter values at room temperature have no obvious trend in their variation from the yttrium substitution by a rare-earth element. It was also observed that the temperature dependence of the positron annihilation parameters is similar in the high-T c superconducting samples. (orig.)

  12. Synthesis under ambient pressure and tri-axial magnetic orientation in REBa2Cu4O8 (RE = Y, Sm, Eu, Gd, Dy, Ho, Er)

    International Nuclear Information System (INIS)

    Yamaki, M.; Horii, S.; Haruta, M.; Maeda, T.; Shimoyama, J.

    2011-01-01

    REBa 2 Cu 4 O 8 (RE124) was synthesized by a flux method in ambient pressure for RE = Y, Sm, Eu, Gd, Dy, Ho and Er. Tri-axial orientation of RE124 was achieved in a modulated rotating magnetic field of 10 T. Orientation axes in RE124 depended on the type of RE. Magnetization axes were determined from magnetic anisotropies of Cu and RE ions. We report the rare-earth (RE)-dependent magnetization axes of REBa 2 Cu 4 O 8 , which was synthesized by a flux method under ambient pressure, using powder samples tri-axially oriented in a modulated rotating magnetic field of 10 T. By optimizing the growth temperature and cooling rate, RE124 crystals were successfully grown for RE = Y, Sm, Eu, Gd, Dy, Ho, and Er. From the X-ray diffraction measurement, the magnetically oriented directions were largely dependent on the type of RE ions of RE124. However, the tri-axial magnetic anisotropies of RE124 could be qualitatively understood in terms of the magnitude relation between the single-ion magnetic anisotropy of RE 3+ ions and the magnetic anisotropy generated by the CuO 2 plane and Cu-O chain. For the practical use of this magneto-scientific process, the control of magnetization axes and tri-axial magnetic anisotropies through crystallochemical control is indispensable.

  13. Molecular and ionic associates in the saturated vapor over erbium trichloride and the ErCl3 - DyCl3 system

    International Nuclear Information System (INIS)

    Pogrebnoj, A.M.; Motalov, V.B.; Kuznetsov, A.Yu.; Kudin, L.S.; Khasanshin, I.V.

    2002-01-01

    The aims of the work are: determination of sublimation enthalpies of erbium trichloride as molecular associates, refinement of sublimation enthalpies in the form of monomer molecules and recovery of thermochemical characteristics and ion components of vapor over the erbium trichloride and the ErCl 3 - DyCl 3 system. The high temperature (969 - 1097 K) mass spectrometry was used for the investigation into the composition of saturated vapor over the erbium trichloride and ErCl 3 - DyCl 3 system, the partial pressures of the neutral components of the vapor were determined. The results of the calculations of the erbium trichloride sublimation enthalpies as monomer, dimer and trimer molecules are demonstrated. The formation enthalpies of the molecules were determined based on the obtained sublimation enthalpies and the formation enthalpies of the erbium trichloride in condensed state. The formation enthalpies of the ions were determined on the basis of enthalpies of ion-molecular reactions. The formation enthalpies of the dimer, trimer mixed molecules and ion associates were determined for the first time [ru

  14. Critical evaluation and thermodynamic optimisation of the Si-RE systems: Part II. Si-RE system (RE = Gd, Tb, Dy, Ho, Er, Tm, Lu and Y)

    International Nuclear Information System (INIS)

    Kim, Junghwan; Jung, In-Ho

    2015-01-01

    Highlights: • The (Si-RE) (RE = Gd, Tb, Dy, Ho, Er, Tm, Lu and Y) systems have been reviewed. • The thermodynamic optimization of the (Si-RE) systems have been performed. • Systematic changes and similarities in the (Si-RE) systems were found. • The systematic approach resolved inconsistencies in the experimental data. • The systematic approach was used to assess the unexplored phase diagrams. - Abstract: A critical evaluation and optimisation of all available phase diagrams and thermodynamic data of the (Si-RE) (RE = Gd, Tb, Dy, Ho, Er, Tm, Lu and Y) systems was conducted to obtain reliable thermodynamic functions of all the phases in the system. In the thermodynamic modelling, a systematic analysis involving the similarity and periodicity observed in the lanthanide series was applied to resolve inconsistencies in the experimental data and to estimate the unknown thermodynamic properties and phase equilibria data. In particular, the phase diagrams and thermodynamic properties of (Si-Tm) and (Si-Lu) systems which are rarely investigated can be predicted from this approach. Systematic trends in thermodynamic properties of solid and liquid phases and phase diagram of the entire (Si-RE) systems were summarized

  15. Heat capacities, magnetic properties, and resistivities of ternary RPdBi alloys where R = La, Nd, Gd, Dy, Er, and Lu

    International Nuclear Information System (INIS)

    Riedemann, T.M.

    1996-01-01

    Over the past four and a half decades research on the rare earths, their compounds, and their alloys has yielded significant insights into the nature of materials. The rare earths can be used to systematically study a series of alloys or compounds. Magnetic ordering, crystalline fields, spin fluctuations, the magnetocaloric effect, and magnetostriction are a small sample of phenomena studied that are exhibited by the rare earth family. A significant portion of research has been conducted on the abundant RM 2 and RM phases, where R is the rare earth and M is a transition metal. The natural progression of science has led to the study of related RMX ternary phases, where X is either another transition metal or semimetal. There are now over 1,000 known RMX phases. The focus of this study is on RPdBi where R = La, Nd, Gd, Dy, Er, and Lu. Their heat capacities, magnetic properties, and resistivities are studied

  16. Magnetism of cyano-bridged Ln3+-M3+ complexes. Part II: one-dimensional complexes (Ln3+ = Eu, Tb, Dy, Ho, Er, Tm; M3+ = Fe or Co) with bpy as blocking ligand.

    Science.gov (United States)

    Figuerola, Albert; Ribas, Joan; Casanova, David; Maestro, Miguel; Alvarez, Santiago; Diaz, Carmen

    2005-10-03

    The reaction of Ln(NO3)3(aq) with K3[Fe(CN)6] or K3[Co(CN)6] and 2,2'-bipyridine in water/ethanol led to 13 one-dimensional complexes: trans-[M(CN)4(mu-CN)2Ln(H2O)4(bpy)]n.4nH2O.1.5nbpy (Ln = Eu3+, Tb3+, Dy3+, Ho3+, Er3+, Tm3+, Lu3+; M = Fe3+, Co3+). The structures for [EuFe]n (1), [TbFe]n (2), [DyFe]n (3), [HoFe]n (4), [ErFe]n (5), [TmFe]n (6), [LuFe]n (7), [EuCo]n (8), [TbCo]n (9), [DyCo]n (10), [HoCo]n (11), [ErCo]n (12), and [TmCo]n (13) have been solved: they crystallize in the triclinic space group P and are isomorphous. They exhibit a supramolecular architecture created by the interplay of coordinative, hydrogen bonding, and pi-pi interactions. A stereochemical study of the eight-vertex polyhedra of the lanthanide ions, based on continuous shape measures, is presented. The Ln3+-Fe3+ interaction is antiferromagnetic in [DyFe]n and [TbFe]n. For [EuFe]n, [HoFe]n, [ErFe]n, and [TmFe]n, there is no sign of any significant interaction. The magnetic behavior of [DyFe]n suggests the onset of weak long-range ferromagnetic ordering at 2.5 K.

  17. Preparation, Characterization, and Ionic Transport Properties of Nanoscale Ln2Zr2O7 (Ln = Ce, Pr, Nd, Sm, Gd, Dy, Er, and Yb) Energy Materials

    Science.gov (United States)

    Solomon, Sam; George, Aneesh; Thomas, Jijimon Kumpakkattu; John, Annamma

    2015-01-01

    Nanoparticles of lanthanide (Ln)-based zirconates have been prepared through the autoignited combustion technique. The structure of the system was analyzed by powder x-ray diffraction and vibrational spectroscopic tools. The compounds with Ln = Ce, Pr, Nd, Sm, and Gd have pyrochlore cubic structure, whereas those with Ln = Dy, Er, and Yb possess anion-deficient disordered cubic fluorite structure. The optical properties of the powder were analyzed using ultraviolet-visible spectroscopy. Pellets of the compounds were sintered in the range from 1325°C to 1530°C for 2 h. The surface morphology of sintered Nd2Zr2O7 was analyzed by scanning electron microscopy. Impedance spectroscopic studies of the samples were carried out at different temperatures. The conductivity increased to the order of 10-2 S/m at 750°C, and the highest conductivity of 13.21 × 10-2 S/m was obtained for Er2Zr2O7. All samples of this system are suitable candidates for fabrication of electrolytes for use in solid oxide fuel cells, particularly at moderate temperatures.

  18. Ternary rare earth metal boride carbides containing two-dimensional boron carbon network: The crystal and electronic structure of R2B4C (R=Tb, Dy, Ho, Er)

    Science.gov (United States)

    Babizhetskyy, Volodymyr; Zheng, Chong; Mattausch, Hansjürgen; Simon, Arndt

    2007-12-01

    The ternary rare earth boride carbides R2B4C (R=Tb, Dy, Ho, Er) have been synthesized by reacting the elements at temperatures between 1800 and 2000K. The crystal structure of Dy2B4C has been determined from single-crystal X-ray diffraction data. It crystallizes in a new structure type in the orthorhombic space group Immm (a=3.2772(6) Å, b=6.567(2) Å, c=7.542(1) Å, Z=2, R1=0.035 (wR2=0.10) for 224 reflections with Io>2σ(Io)). Boron atoms form infinite chains of fused B6 rings in [100] joined with carbon atoms into planar, two-dimensional networks which alternate with planar sheets of rare earth metal atoms. The electronic structure of Dy2B4C was also analyzed using the tight-binding extended Hückel method.

  19. Structural and magnetic properties of Fe2P-type R6TTe2 compounds (R = Tb, Dy, Ho, Er, T = Fe, Co, Ru): Magnetic properties and specific features of magnetic entropy change

    Science.gov (United States)

    Morozkin, A. V.; Genchel, V. K.; Knotko, A. V.; Yapaskurt, V. O.; Yao, Jinlei; Quezado, S.; Malik, S. K.

    2018-02-01

    The magnetic properties and magnetic entropy changes of the Fe2P-type Ho6FeTe2, Ho6CoTe2, Er6CoTe2, Tb6RuTe2, Dy6RuTe2 and Ho6RuTe2 (space group P-62m, N 189, hP9) have been studied by means of bulk magnetization and heat capacity measurements. Also, the tentative magnetic entropy change ΔSm* = (∂M / ∂T) × H was used for characterization of magnetic ordering. Ho6FeTe2, Ho6CoTe2, Er6CoTe2, Tb6RuTe2, Dy6RuTe2 and Ho6RuTe2 exhibit complex field sensitive ferro-antiferromagnetic ordering. The correlation between the isothermal magnetic entropy change and the magnetic ordering of these compounds have been studied.

  20. Synthesis and magnetism of μ-oxamido-bridged Cu2IILnIII - type heterotrinuclear complexes (Ln = Ce, Nd, Sm, Eu, Gd, Tb, Dy, Er)

    International Nuclear Information System (INIS)

    Li, Y.T.; Yan, C.W.

    2001-01-01

    Eight new Cu 2 II Ln III - type (Ln = Ce, Nd, Sm, Eu, Gd, Tb, Dy, Er) heterotrinuclear complexes bridged by N,N'-bis (2-aminopropyl)oxamidocopper(II) [Cu(oxdn)], namely Cu 2 (oxdn)Ln(NO 3 ) 3 , have been synthesized and characterized by elemental analyses, molar conductivity measurements and spectroscopic (IR, UV, ESR) studies. Magnetic susceptibility measurements (4.2 ∼300 K) and studies of Cu 2 (oxdn)Gd(NO 3 ) 3 complex have revealed that the central gadolinium(III) and terminal copper(II) ions are ferromagnetically coupled with the exchange integral J (Cu-Gd) = +2.98 cm -1 , while an antiferromagnetic coupling is detected between the terminal copper(II) metal ions with the exchange integral J' (Cu-Gd) = -0.75 cm -1 , on the basis of the spin Hamiltonian operator [H -2J(S Cu1 -S Gd +S Cu2 +S Gd )-2J'(S Cu1 S Cu2 )]. (author)

  1. First-principle calculations of crystal structures, electronic structures, and optical properties of RETaO4 (RE = Y, La, Sm, Eu, Dy, Er)

    Science.gov (United States)

    Ma, Zhuang; Zheng, Jiayi; Wang, Song; Gao, Lihong

    2018-01-01

    It is an effective method to protect components from high power laser damage using high reflective materials. The rare earth tantalates RETaO4 with high dielectric constant suggests that they may have very high reflectivity, according to the relationship between dielectric constant and reflectivity. The crystal structures, electronic structures, and optical properties of RETaO4 (RE=Y, La, Sm, Eu, Dy, Er) have been studied by first-principle calculations. With the increasing atomic number of RE (i.e., the number of 4f electrons), a 4f electron shell moves from the bottom of conduction band to the forbidden gap and then to the valence band. The relationship between the electronic structures and optical properties is explored. The electron transitions among O 2p states, RE 4f states, and Ta 5d states have a key effect on optical properties such as dielectric function, absorption coefficient, and reflectivity. For the series of RETaO4, the appearance of the 4f electronic states will obviously promote the improvement of reflectivity. When the 4f states appear at the middle of the forbidden gap, the reflectivity reaches the maximum. The reflectivity of EuTaO4 at 1064 nm is up to 93.47%, indicating that it has potential applications in the antilaser radiation area.

  2. A single crystal study of RE{sub 14}Co{sub 3}In{sub 3} (RE = Y, Tb, Dy, Ho, Er)

    Energy Technology Data Exchange (ETDEWEB)

    Zaremba, V.I.; Kalychak, Y.M.; Dzevenko, M.V. [Inorganic Chemistry Dept., Ivan Franko National Univ. of Lviv (Ukraine); Rodewald, U.Ch.; Heying, B.; Poettgen, R. [Inst. fuer Anorganische und Analytische Chemie, Westfaelische Wilhelms-Univ. Muenster (Germany)

    2006-01-01

    The rare earth-cobalt-indides RE{sub 14}Co{sub 3}In{sub 3} (RE = Y, Tb, Dy, Ho, Er) were prepared in polycrystalline form from the elements by arc-melting. Small single crystals were grown through a special annealing sequence. The compounds were investigated on the basis of X-ray powder and single crystal data: Lu{sub 14}Co{sub 2}In{sub 3} (Gd{sub 14}Co{sub 3}In{sub 2.7}) type, P4{sub 2}/nmc, Z = 4, a = 959.0(1), c = 2319.1(5) pm, wR2 = 0.055, 2289 F{sup 2} values, 65 variables for Y{sub 13.90}Co{sub 2.99}In{sub 3.02}, a = 953.8(1), c = 2315.8(5) pm, wR2 = 0.108, 2357 F{sup 2} values, 65 variables for Tb{sub 13.92}Co{sub 3.01}In{sub 2.92}, a = 949.24(3), c = 2296.5(1) pm, wR2 = 0.129, 2518 F{sup 2} values, 65 variables for Dy{sub 13.90}Co{sub 2.97}In{sub 2.95}, a = 946.3(1), c = 2289.0(5) pm, wR2 = 0.099, 2297 F{sup 2} values, 64 variables for Ho{sub 14}Co{sub 2.80}In{sub 2.89}, and a = 941.0(1), c = 2274.2(5) pm, wR2 = 0.140, 2450 F{sup 2} values, 65 variables for Er{sub 13.83}Co{sub 2.88}In{sub 3.10}. All RE{sub 14}Co{sub 3}In{sub 3} indides show a small degree of In/Co mixing (between 7 and 16% Co) on the 4c In1 site and defects on the 8g Co1 positions (between 84 and 95% Co). Except for the holmium compound, the RE{sub 14}Co{sub 3}In{sub 3} intermetallics also reveal RE/In mixing on the 4c RE1 sites, leading to the refined compositions. The seven crystallographically independent RE sites have between 9 and 10 nearest RE neighbors. The RE{sub 14}Co{sub 3}In{sub 3} structures consist of a complex intergrowth of rare earth based polyhedra. Both cobalt sites have a distorted trigonal-prismatic rare earth coordination. An interesting feature is the In2-In2 dumb-bell with an In2-In2 distance of 300 pm (for Ho{sub 14}Co{sub 2.80}In{sub 2.89}). The crystal chemistry of the RE{sub 14}Co{sub 3}In{sub 3} indides is discussed. (orig.)

  3. Mobiililaitteiden käytön ergonominen ratkaisu

    OpenAIRE

    Heikkinen, Kristoffer

    2017-01-01

    Opinäytetyöni keskeisenä tarkoituksena oli tutkia mobiililaitteiden käytön ergonomiaa, sekä niiden käytön sisältämiä ergonomisia ongelmia. Tutkimuksen tulosten pohjalta tavoitteena oli suunnitella kaluste parantamaan käyttöasentoa. Aluksi selvitin käyttäjien kuvien kautta millaisissa asennoissa mobiililaitteita käytetään. Tämän lisäksi selvitin kirjallisten lähteiden avulla, mitä ergonomisia ongelmakohtia mobiililaitteiden käytössä on. Taustamateriaalin pohjalta suunnittelin ergonomiamal...

  4. Magnetic and structural features of RNi2B2C and RNiBC (R=Er, Ho, Dy, Tb, Gd) superconducting compounds

    OpenAIRE

    Baggio-Saitovitch, E. M.; Sánchez, D. R.; Micklitz, H.

    2002-01-01

    Temperature dependent Mössbauer spectroscopy on 57Fe doped (1 at % of Ni) RNi2B2C and RNiBC provided clear evidence of a pair-breaking field at the Ni site for non-superconducting compounds. This field is not present in the superconducting collinear AF DyNi2B2C, however it appears when this compound is diluted with non-magnetic Lu (Dy1-xLu xNi2B2C). Important local information on the spin structure of the R magnetic moments is obtained for both systems. The local symmetries of RNi2B2C and RNi...

  5. Facile synthesis and luminescence properties of Y2O3:Ln(3+) (Ln(3+) = Eu(3+), Tb(3+), Dy(3+), Sm(3+), Er(3+), Ho(3+), Tm(3+), Yb(3+)/Er(3+), Yb(3+)/Tm(3+), Yb(3+)/Ho(3+)) microspheres.

    Science.gov (United States)

    Xu, Zhenhe; Zhao, Qian; Ren, Baoyi; You, Lixin; Sun, Yaguang

    2014-08-01

    Multicolor and monodisperse Y2O3:Ln(3+) (Ln(3+) = Eu(3+), Tb(3+), Dy(3+), Sm(3+), Er(3+), Ho(3+), Tm(3+), Yb(3+)/Er(3+), Yb(3+)/Ho(3+)) microspheres were prepared through a facile urea-assisted homogeneous precipitation method followed by a subsequent calcination process. X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), high-resolution transmission electron microscopy (HRTEM), energy-dispersive X-ray spectrum (EDS), Fourier transformed infrared (FT-IR), thermogravimetric analysis (TGA), photoluminescence (PL) and cathodoluminescence (CL) spectra were employed to characterize the samples. The XRD results reveal that the as-prepared spheres can be well indexed to cubic Y2O3 phase with high purity. The SEM and TEM images show the obtained Y2O3:Ln(3+) samples consist of regular nanospheres with the mean diameter of 350 nm. And the possible formation mechanism is also proposed. Upon ultraviolet and low-voltage electron beams excitation, Y2O3:Ln(3+) (Ln(3+) = Eu(3+), Tb(3+), Dy(3+), Sm(3+), Er(3+), Ho(3+), Tm(3+)) samples exhibit respective bright red (Eu(3+), (5)D0 --> (7)F2), green (Tb(3+), (5)D4 --> (7)F5), blue (Dy(3+), (4)F9/2 --> (6)H13/2), yellow (Sm(3+), (4)G5/2 --> (6)H7/2), green (Er(3+), (4)S3/2 --> (4)I15/2), green (Ho(3+), (5)S2 --> (5)I8), blue (Tm(3+), (1)D2 --> (3)F4) down-conversion (DC) emissions. Under 980 nm NIR irradiation, Y2O3:Ln(3+) (Ln(3+) = Yb(3+)/Er(3+), Yb(3+)/Tm(3+) and Yb(3+)/Ho(3+)) exhibit characteristic up-conversion (UC) emissions of green (Er(3+), (2)H11/2, (4)S3/2, (2)H11/2 --> (4)I5/2), blue (Tm(3+), (1)G4 --> (3)H6) and green (Ho(3+), (5)F4, (5)S2 --> (5)I8), respectively. These merits of multicolor emissions in the visible region endow this kind of material with potential applications in the field of light display systems, lasers, and optoelectronic devices.

  6. Magnetic properties of the charge density wave compounds RTe3, R=Y, La, Ce, Pr, Nd, Sm, Gd, Tb, Dy, Ho, Er & Tm

    Energy Technology Data Exchange (ETDEWEB)

    Ru, N.; Chu, J.-H.; Fisher, I.R.; /Stanford U., Geballe Lab.

    2009-12-14

    The antiferromagnetic transition is investigated in the rare-earth (R) tritelluride RTe{sub 3} family of charge density wave (CDW) compounds via specific heat, magnetization and resistivity measurements. Observation of the opening of a superzone gap in the resistivity of DyTe{sub 3} indicates that additional nesting of the reconstructed Fermi surface in the CDW state plays an important role in determining the magnetic structure.

  7. Synthesis of New RE3+ Doped Li1+xTa1−xTixO3 (RE: Eu, Sm, Er, Tm, and Dy Phosphors with Various Emission Colors

    Directory of Open Access Journals (Sweden)

    Hiroyuki Hayashi

    2013-07-01

    Full Text Available New phosphors with various emission colors for RE3+ doped Li1+xTa1−xTixO3 (LTT (RE: Eu, Sm, Er, Tm, and Dy were synthesized by electric furnace at 1423 K for 15 h. The microstructure of the host material and the photoluminescence (PL property were determined and compared to those of RE3+ doped Li1+xNb1−xTixO3 (LNT. In the LTT phosphor, the highest PL intensity was achieved for the mixture composition Li1.11Ta0.89Ti0.11O3 with a LiTaO3 structure, although it has an M-phase superstructure. In the LTT host material, the effective activators were Eu3+ and Sm3+ ions, in contrast to the LNT host material. Here, we discuss the relationship between PL property and the host material’s structure.

  8. Study of a new magnetic dipole mode in the heavy deformed nuclei 154Sm, 156Gd, 158Gd, 164Dy, 168Er, and 174Yb by high-resolution electron spectroscopy

    International Nuclear Information System (INIS)

    Bohle, D.

    1985-01-01

    By inelastic electron scattering with high energy resolution a new magnetic dipole mode in heavy, deformed nuclei could be detected. For this the nuclei 154 Sm, 156 Gd, 158 Gd, 164 Dy, 168 Er, and 174 Yb were studied at the Darmstadt electron linear accelerator (DALINAC) at small momentum transfer q ≤ 0.6 fm -1 and low excitation energies. A collective magnetic dipole excitation could be discovered in all nuclei at an excitation energy of E x ≅ 66 δA -1/3 MeV whereby δ means the mass deformation. The transition strength extends in the mean to B(M1)↑ ≅ 1.3 μ N 2 . A systematic study of the nucleus 156 Gd yielded hints to a strong fragmentation of the magnetic dipole strength. A comparison of electron scattering, proton scattering, and nuclear resonance fluorescence experiments shows that the new mode is a pure orbital mode. (orig./HSI) [de

  9. Itselleluovutuksen käytännöt

    OpenAIRE

    Lybeck, Mari

    2014-01-01

    Tämän mestarityön tarkoituksena oli selvittää ja kirjata laajan ja pitkäkestoisen hotellikiinteistön peruskorjauksen itselleluovutuksen käytännöt rakennushankkeen 2-vaiheen aikana. Itselleluovutusten dokumentointi toteutettiin osana Consti Korjausurakoinnin työnjohtotehtäviä Consti Scandic Parkin työmaalla kesäkaudella 2014. Teoriaosuudessa perehdyttiin itselleluovutuksen viranomaisvaatimuksiin, rakennusalan yleisesti hyväksyttyihin laadun ja itselleluovutuksen käytäntöihin, Consti S...

  10. TOIMITUSKETJURATKAISUJA Case: Yhteinen pöytä

    OpenAIRE

    Metso, Kim

    2016-01-01

    Tämän tutkielman tutkimusongelma on löytää Yhteisen pöytäprojektiin toimitusketjuratkaisuja, jotka kehittävät ja tekevät toiminnasta kustannustehokkaampaa. Tutkielma käsittelee toimitusketjuratkaisuja Yhteiselle pöydälle, joka on Vantaan kaupungin hävikkiruoan jakeluun keskittynyt organisaatio. Tässä projektissa Vantaan seurakuntayhtymä ja Diakonia-ammattikorkeakoulu toimivat läheisessä yhteistyössä Vantaan kaupungin kanssa. Tutkielman tarkoituksena on perehtyä toimitusketjun liittyviin analy...

  11. R = Y, Tb, Dy, Ho and Er

    Indian Academy of Sciences (India)

    also found with rare-earth elements, silver and lead (Gulay and Wolcyrz 2001) and in R–Ag–Sn systems, ... forms DFT calculations using the local density approxima- tion with wavefunctions as a basis. Kohn–Sham ... core electrons are described by atomic wavefunctions which are solved relativistically using the current ...

  12. Magnetic Properties of Dy in Pb

    Energy Technology Data Exchange (ETDEWEB)

    Skanthakumar, S.; Soderholm, L.; Movshovich, R.

    1999-07-10

    Superconductivity can be induced at high temperatures in Pb{sub 2}Sr{sub 2}RCu{sub 3}O{sub 8} (R - rare earth) by partially doping Ca{sup 2+} for R{sup 3+}. In order to understand the interplay between magnetism and superconductivity, the magnetic properties of the parent compounds, Pb{sub 2}Sr{sub 2}RCu{sub 3}O{sub 8}, have been studied. The work presented here includes magnetic susceptibility and specific heat measurements on R=Dy and extends the previous studies on R=Ce, Pr, Tb, Ho and Er. Specific heat experiments suggest that the Dy ions order antiferromagnetically with an ordering temperature of 1.3K. The magnetic susceptibility data are in good agreement with the susceptibility calculated using crystal field parameters that are extrapolated from previous modeling of the R=Er and Ho analogs of this series.

  13. Magnetic Properties of Dy in Pb2Sr2DyCu3O8

    International Nuclear Information System (INIS)

    Skanthakumar, S.; Soderholm, L.; Movshovich, R.

    1999-01-01

    Superconductivity can be induced at high temperatures in Pb 2 Sr 2 RCu 3 O 8 (R - rare earth) by partially doping Ca 2+ for R 3+ . In order to understand the interplay between magnetism and superconductivity, the magnetic properties of the parent compounds, Pb 2 Sr 2 RCu 3 O 8 , have been studied. The work presented here includes magnetic susceptibility and specific heat measurements on R=Dy and extends the previous studies on R=Ce, Pr, Tb, Ho and Er. Specific heat experiments suggest that the Dy ions order antiferromagnetically with an ordering temperature of 1.3K. The magnetic susceptibility data are in good agreement with the susceptibility calculated using crystal field parameters that are extrapolated from previous modeling of the R=Er and Ho analogs of this series

  14. Toimiminen sähkölaitteiston käytön johtajana

    OpenAIRE

    Viitasalo, Joona

    2011-01-01

    Tässä insinöörityössä selvitettiin sähkölaitteiston käytön johtajaa sekä haltijaa velvoittavat lait, määräykset ja säädökset. Tarkastelun kohteeksi valittiin myös vastuiden jakautuminen haltijan ja käytön johtajan välillä. Lisäksi työn tarkoituksena oli selvittää käytön johtajan toimintaan liittyvät tehtävät ja antaa niistä selkeä kuvaus. Tämä työ tehtiin ISS Palvelut Oy:n pyynnöstä. Koska käytön johtajalla on tärkeä asema muuntamoiden määräaikaishuolloissa, työhön kuvattiin myös käytön j...

  15. YT: A Multi-Code Analysis Toolkit for Astrophysical Simulation Data

    Energy Technology Data Exchange (ETDEWEB)

    Turk, Matthew J.; /San Diego, CASS; Smith, Britton D.; /Michigan State U.; Oishi, Jeffrey S.; /KIPAC, Menlo Park /Stanford U., Phys. Dept.; Skory, Stephen; Skillman, Samuel W.; /Colorado U., CASA; Abel, Tom; /KIPAC, Menlo Park /Stanford U., Phys. Dept.; Norman, Michael L.; /aff San Diego, CASS

    2011-06-23

    The analysis of complex multiphysics astrophysical simulations presents a unique and rapidly growing set of challenges: reproducibility, parallelization, and vast increases in data size and complexity chief among them. In order to meet these challenges, and in order to open up new avenues for collaboration between users of multiple simulation platforms, we present yt (available at http://yt.enzotools.org/) an open source, community-developed astrophysical analysis and visualization toolkit. Analysis and visualization with yt are oriented around physically relevant quantities rather than quantities native to astrophysical simulation codes. While originally designed for handling Enzo's structure adaptive mesh refinement data, yt has been extended to work with several different simulation methods and simulation codes including Orion, RAMSES, and FLASH. We report on its methods for reading, handling, and visualizing data, including projections, multivariate volume rendering, multi-dimensional histograms, halo finding, light cone generation, and topologically connected isocontour identification. Furthermore, we discuss the underlying algorithms yt uses for processing and visualizing data, and its mechanisms for parallelization of analysis tasks.

  16. ITIL-malli käytännössä

    OpenAIRE

    Salomäki, Erika

    2014-01-01

    Opinnäytetyön tarkoituksena oli tutkia, millaisia kokemuksia ITIL-mallin käyttöönotosta, sen käytöstä ja käytännön toimivuudesta organisaatioilla ja asiantuntijoilla on. Työn teoriapohjana käytettiin ITIL 2011 -painoksen viittä julkaisua, sekä erilaisia sähköisiä julkaisuja selvitettäessä mm. ISO/IEC 20000 -standardin kytköstä ITIL-malliin.

  17. AND Dy(III)

    African Journals Online (AJOL)

    userpc

    ACTIVITIES OF Sm(III) AND Dy(III) COMPLEXES WITH SCHIFF BASE DERIVED FROM ... and spectral analysis show that ligand coordinate to the central lanthanide(III)ion by its imine nitrogen, phenolic oxygen and carboxylic oxygen in 1:1 stoichemetry. The complexes were ... instance iron (III) and cobalt (III) complexes.

  18. ytäroolipelaaminen nuorisotyön menetelmänä : Toimintatutkimus Iisalmessa vuonna 2009

    OpenAIRE

    Porkka, Milla; Salmikari, Minttu

    2009-01-01

    Nuorisotyössä tarvitaan erilaisia menetelmiä, jotta jokainen nuori voi löytää itseään kiinnostavaa toimintaa kasvatuksellisessa ympäristössä. Tässä opinnäytetyössä tutkittiin pöytäroolipelaamisen soveltuvuutta nuorisotyön menetelmänä Iisalmessa ja tuotiin sitä tutuksi Pohjois-Savossa. Tutkimus toteutettiin toimintatutkimuksena; pöytäroolipeliä pelattiin Iisalmen nuorisotalon tilassa viiden viikon ajan, yhteensä kahdeksan pelikertaa. Pelissä kehitettiin nuoruusiän kehitystehtävien ...

  19. Synthesis, structural characterization and Mössbauer study of LnV{sub 0.5}Fe{sub 0.5}O{sub 3} perovskites (Ln = Y, La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho and Er)

    Energy Technology Data Exchange (ETDEWEB)

    Ivashita, Flávio F.; Biondo, Valdecir; Bellini, Jusmar V.; Paesano, Andrea [Departamento de Física, Universidade Estadual de Maringá, Av. Colombo 5790, 87.020-900 Maringá, PR (Brazil); Blanco, M. Cecilia; Fuertes, Valeria C.; Pannunzio-Miner, Elisa V. [INFIQC-CONICET, Departamento de Fisicoquímica, Facultad de Ciencias Químicas, Universidad Nacional de Córdoba, X5000HUA Córdoba (Argentina); Carbonio, Raúl E., E-mail: carbonio@fcq.unc.edu.ar [INFIQC-CONICET, Departamento de Fisicoquímica, Facultad de Ciencias Químicas, Universidad Nacional de Córdoba, X5000HUA Córdoba (Argentina)

    2012-09-15

    Graphical abstract: Mössbauer spectra taken at 200 K for the Y(V{sub 0.5}Fe{sub 0.5})O{sub 3} orthoferrivanadate synthesized by arc-melting. Highlights: ► LnFe{sub 0.5}V{sub 0.5}O{sub 3} were synthesized by the first time for most of the rare-earth elements. ► These orthoferrivanadates crystallize metastably with the perovskite structure. ► Iron and vanadium are trivalent stabilized in these solid solutions. ► The Mössbauer quadrupolar splitting is correlated with the tolerance factor. ► Below 100 K, these perovskites undergo a crystallographic phase transformation. -- Abstract: Perovskites LnV{sub 0.5}Fe{sub 0.5}O{sub 3} (Ln = Y, La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho and Er) were synthesized by rapid solidification from arc-melted samples and characterized by the study of their crystal structure and hyperfine properties. These metastable solid solutions crystallized in the Pbnm symmetry, with the iron and vanadium cations randomly distributed in the transition metal octahedral sites. Depending on the lanthanide present at the A site of the perovskite, iron is present with two valences (i.e., Fe{sup 3+} and Fe{sup 2+}). The volume of the unit cell for these perovskites increases linearly with the lanthanide ionic radius, as the perovskite approaches its ideal structure. At room temperature, the quadrupolar splitting of the trivalent paramagnetic Mössbauer component works as an indirect measurement for the Goldshmidt tolerance factor. Close to or below 100 K, these perovskites undergo a crystallographic phase transformation, probably due to orbital ordering of the V{sup 3+} cations, originating two different magnetic iron sites.

  20. Stirlingmoottorin hyödyntäminen ajoneuvokäytössä

    OpenAIRE

    Heikkilä, Eero

    2015-01-01

    Tämän insinöörityön tavoitteena oli selvittää stirlingmoottorin mahdollista soveltuvuutta ajoneuvokäyttöön modernin sähköisen voimalinjan kanssa. Työn tilasi Neste Oyj:n tuotekehitysosasto. Työssä tarkastellaan strilingmoottoria jatkuvasti ajoneuvokäytön näkökulmasta. Työ on kirjallisuustutkimus, jossa aluksi selvitetään kattavasti stirlingmoottorin historia, toimintaperiaate, erilaiset rakennemahdollisuudet, komponentit ja niiden merkitys moottorin toiminnan kannalta. Stirlingmoottorin y...

  1. Rapsin viljelykäytäntöjen eroavaisuudet Suomessa ja Ruotsissa

    OpenAIRE

    Brofeldt, Jere

    2014-01-01

    Työn taustana on kesällä 2013 suoritetun erikoisharjoittelun aikana tekemäni havainto Suomen ja Ruotsin erisuuruisista rapsin hehtaarisadoista alueilla, joissa sääolosuhteet olivat hyvin samankaltaiset. Työn tilaaja on Aki Brofeldt Mäkelän tilalta Hollolasta. Työn tavoitteena on selvittää onko maidemme välillä sellaisia ratkaisevia eroja rapsin viljelykäytännössä, jotka voisivat selittää satoeron. Työn tarkoituksena on vertailla kummankin maan normaaleja viljelytekniikoita. Aikaisempaa va...

  2. Electrical transport and magnetic ordering in 2 Ti 3 Ge 4 (= Dy ...

    Indian Academy of Sciences (India)

    Home; Journals; Pramana – Journal of Physics; Volume 58; Issue 5-6. Electrical transport and magnetic ordering in 2Ti3Ge4 (=Dy, Ho and Er) compounds. R Nirmala V Sankaranarayanan K Sethupathi A V Morozkin T Geethakumary Y Hariharan. Colossal Magnetoresistance & Other Materials Volume 58 Issue 5-6 ...

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

    Indian Academy of Sciences (India)

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

  4. The effect of support springs in ends welded gap hollow YT-joint

    Directory of Open Access Journals (Sweden)

    R. F. Vieira

    Full Text Available This paper presents an analysis on the effect of support springs in an ends circular hollow sections welded into a YT joint. The overall behavior and failure of the joint were characterized under axial compression of the lap brace. Two joint failure modes were identified: chord wall plastification (Mode A and cross-sectional chord buckling (Mode F in the region below the lap brace. The system was modeled with and without support springs using the numerical finite element program Ansys. Model results were compared with experimental data in terms of principal stress in the joint intersection. The finite element model without support springs proved to be more accurate than that with support springs.

  5. Motivoiva terveysneuvonta nuorten alkoholinkäytön vähentämisessä

    OpenAIRE

    Mäkynen, Hanna; Sainio, Suvi

    2013-01-01

    Tämä opinnäytetyö on osa EU-rahoitteista Alcohol and Drug Prevention among Youth (ADPY) –projektia. Turun Ammattikorkeakoulu on osallistunut projektin osakokonaisuuteen (WP7), jossa on kehitetty ADPY -yhteistyömalli ja järjestetty koulutuksia terveydenhuoltoalan ammattilaisille. Tämän opinnäytetyön tarkoituksena oli selvittää, mitä on motivoiva terveysneuvonta ja miten sitä on hyödynnetty käytännön hoitotyössä. Työn tavoitteena on, että menetelmä vakiintuisi hoitoalan ammattilaisten käyttö...

  6. Etätyöpöytäyhteyksien testaus

    OpenAIRE

    Hannula, Toni

    2009-01-01

    Opinnäytetyössä tutkittiin eri etäkäyttöohjelmia ja vertailtiin niiden mahdollisuuksia toimia lähiverkossa Windows-ympäristön ylläpidossa. Vertailun tekeminen oli tärkeää, koska vastaavanlaista vertailua ei ollut aikaisemmin tehty kyseiselle yritykselle. Etäkäyttöohjelmia oli tarjolla erittäin paljon ja ne olivat hyvin eritasoisia. Vertailtavaksi otettiin ilmaisia ja maksullisia etäkäyttöohjelmia. Se sisälsi seuraavat ohjelmat Etätyöpöytäyhteys, NetOp Remote Control, RealVNC, TeamViewer,...

  7. Magnetic properties of Dy in Pb{sub 2}Sr{sub 2}DyCu{sub 3}O{sub 8}.

    Energy Technology Data Exchange (ETDEWEB)

    Movshovich, R.; Skanthakumar, S.; Soderholm, L.

    1999-07-02

    Superconductivity can be induced at high temperatures in Pb{sub 2}Sr{sub 2}RCu{sub 3}O{sub 8} (R - rare earth) by partially doping Ca{sup 2+} for R{sup 3+}. In order to understand the interplay between magnetism and superconductivity, the magnetic properties of the parent compounds, Pb{sub 2}Sr{sub 2}RCu{sub 3}O{sub 8}, have been studied. The work presented here includes magnetic susceptibility and specific heat measurements on R = Dy and extends our previous studies on R = Ce, Pr, Tb, Ho and Er. Specific heat experiments suggest that the Dy ions order antiferromagnetically with an ordering temperature of 1.3K. The magnetic susceptibility data are in good agreement with the susceptibility calculated using crystal field parameters that are extrapolated from previous modeling of the R = Er and Ho analogs of this series.

  8. 51Chromium survival of Yt(a+) red cells as a determinant of the in vivo significance of anti-Yta

    International Nuclear Information System (INIS)

    Davey, R.J.; Simpkins, S.S.

    1981-01-01

    A case is presented in which anti-Yta produced a moderately accelerated removal of chromium-labeled Yt(a+) red blood cells (T1/2, 96 hours). Other reported examples of anti-Yta either have rapidly removed transfused Yt(a+) red blood cells or have permitted apparently normal survival of these cells. In light of this wide variation in in vivo potency of anti-Yta, it is recommended that chromium red blood cell survival studies be done before transfusion of Yt(a+) red blood cells in sensitized individuals

  9. 161Dy Moessbauer spectroscopy of the intermetallic compounds DyNi2Si2, DyNi2Ge2 and DyAg2Si2

    International Nuclear Information System (INIS)

    Onodera, Hideya; Murata, Akifumi; Koizuka, Masaaki; Ohashi, Masayoshi; Yamaguchi, Yasuo

    1994-01-01

    161 Dy Moessbauer spectroscopic study has been performed on DyNi 2 Si 2 , DyNi 2 Ge 2 and DyAg 2 Si 2 in order to clarify microscopic properties of antiferromagnets with incommensurate and sinusoidally moment-modulated structure. The experiments were done using the standard 161 Tb Moessbauer sources prepared by neutron irradiation at the Japan Material Testing Reactor. The Moessbauer spectra of DyNi 2 Si 2 are analyzed satisfactorily by a single set of hyperfine parameters, and hence the sinusoidal moment-modulation is considered to be realized through a distribution of spin relaxation rate. The broadened spectra of DyNi 2 Ge 2 are fitted tentatively by three subspectra. It seems for DyNi 2 Ge 2 that the incommensurate arrangement of Dy moments differed in magnitude as well as the distribution of spin relaxation rate originates the moment modulation. The fact that the spectrum of DyAg 2 Si 2 at 3 K consists of two distinct subspectra ensures the complicated antiferromagnetic structure where two kinds of Dy moments differed in magnitude are arranged noncollinearly. (author)

  10. Heuristiikkojen käyttö hyvien toteutuksien löytämiseksi peleistä

    OpenAIRE

    Porokuokka, Iida

    2013-01-01

    Tutkimuksen tavoitteena oli soveltaa peliarviointimenetelmiä hyvin to- teutettujen elementtien löytämiseksi peleistä. Menetelmäksi valittiin heuristinen ar- viointi. Esimerkkipeliksi valittiin Dota 2. Esimerkkipelin arviointiin ei löytynyt so- pivaa heuristiikkakokoelmaa. Tämän takia muodostettiin uusi kokoelma poimien heuristiikkoja kolmesta eri peliheuristiikkakokoelmasta. Tuloksina löydettiin useita hyviä toteutuksia Dota 2:sta.

  11. Repair of Y-T humeral fractures in the dog using paired 'String of Pearls' locking plates.

    Science.gov (United States)

    Ness, M G

    2009-01-01

    To describe a technique for treating Y-T humeral fractures using paired string of pearls (SOP) plates and to review the outcome in 13 cases. A series of 13 consecutive Y-T humeral fractures, otherwise known as distal humeral dicondylar fractures, were treated according to a surgical protocol which involved combined medial and lateral surgical approaches, accurate reduction and fixation of the condylar fracture with a single transcondylar lag screw, and then re-alignment and fixation of the diaphyseal fracture using two SOP plates and screws. Functional outcome was recorded as excellent in 10 dogs, good in two and poor in one. Six of the 13 patients were working dogs and of these, five returned to pre-injury levels of activity, including work. Complications requiring additional surgery were seen in four of the 13 cases, and three of these cases had a sub-optimal functional outcome. The results following repair of Y-T fractures using SOP locking plates, placed via combined medial and lateral incisions, compared favourably with those reported for other techniques.

  12. DySectAPI: Scalable Prescriptive Debugging

    DEFF Research Database (Denmark)

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

    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...

  13. 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...

  14. Yhdessä kaksoisdiagnoosikuntoutujien kanssa leirikäytäntöjä kehittämässä

    OpenAIRE

    Sibelius, Jenni; Eskelin, Hannele; Penney, Margaret

    2012-01-01

    Eskelin, Hannele, Penney, Margaret ja Sibelius Jenni. Yhdessä kaksoisdiagnoosikuntoutujien kanssa leirikäytäntöjä kehittämässä. Helsinki 2012. 67 s. 1 liite Diakonia-ammattikorkeakoulu, Helsingin yksikkö, sosiaalialan koulutusohjelma, sosionomi (AMK) Opinnäytetyömme tarkoituksena oli kehittää mielenterveyhdistys Etappi ry:n leirikäytäntöjä sekä saada kuntoutujat itse aikaisempaa enemmän osallisiksi suunnitteluun sekä toteutukseen. Opinnäytetyössämme käsitellään mielenterveyttä ja...

  15. Arkea, ammattitaitoa ja yhteistyötä : työntekijöiden kokemuksia käytöshäiriöisten nuorten hoidosta koulukodissa

    OpenAIRE

    Haunia, Henna

    2011-01-01

    TIIVISTELMÄ Haunia, Henna. Arkea, ammattitaitoa ja yhteistyötä : työntekijöiden kokemuksia käytöshäiriöisten nuorten hoidosta koulukodissa. Helsinki, syksy 2011. Diakonia-ammattikorkeakoulu, Diak Etelä, Helsinki. Sosiaalialan koulutusohjelma, sosionomi (YAMK). Tämän opinnäytetyön tarkoituksena oli tutkia koulukodissa tapahtuvaan käytöshäiriöisten nuorten hoitoon liittyviä työmenetelmiä ja kehittämisen tarpeita. Tässä laadullisessa tutkimuksessa tutkimusmenetelmänä oli toimintatutkimus....

  16. Asteroids Dynamic Site-AstDyS

    Science.gov (United States)

    Knezevic, Zoran; Milani, Andrea

    2012-08-01

    The AstDyS online information service (http://hamilton.dm.unipi.it/astdys/) contains data on numbered and multi - opposition asteroids, including orbital elements, their uncertainty, proper elements, ephemerides with uncertainty, and more. AstDyS also provides additional scientific output computed from the raw observational data. This value added currently includes: more accurate orbits computed with advanced dynamical and observational error model s; their uncertainty, as expressed by the covariance matrix formalism; ephemerides computed on request for each observer, with uncertainty; mean and proper orbital elements (for this output, AstDyS is the primary source worldwide); statistical quality control, providing a rigorous observational error model. All this is available with a sophisticated web interface, providing multiple search functions and online computations as well as complete orbital and residual files. There are several ways in which the A stDyS service could be expanded and improved in the next future, like the explicit classification of asteroids into asteroid families, the classification of resonant asteroids, and an updated self - consistent population model (to be used, e.g., for survey simulations). The IAU Division I endorsed the proposal for AstDyS to become an IAU (permanent) service, which would include the IAU supervision of the AstDyS system, keeping under control the quality of the work and the continuous update under conditions of scientific competition.

  17. Series of isostructural planar lanthanide complexes [Ln(III)4(mu3-OH)2(mdeaH)2(piv)8] with single molecule magnet behavior for the Dy4 analogue.

    Science.gov (United States)

    Abbas, Ghulam; Lan, Yanhua; Kostakis, George E; Wernsdorfer, Wolfgang; Anson, Christopher E; Powell, Annie K

    2010-09-06

    A series of five isostructural tetranuclear lanthanide complexes of formula [Ln(4)(mu(3)-OH)(2)(mdeaH)(2)(piv)(8)], (mdeaH(2) = N-methyldiethanolamine; piv = pivalate; Ln = Tb (1), Dy (2), Ho (3), Er (4), and Tm (5)) have been synthesized and characterized. These clusters have a planar "butterfly" Ln(4) core. Magnetically, the Ln(III) ions are weakly coupled in all cases; the Dy(4) compound 2 shows Single Molecule Magnet (SMM) behavior.

  18. Työkierto : Mielipiteitä käytännöstä

    OpenAIRE

    Hietala, Teija; Lehtonen, Anna

    2012-01-01

    Tämän opinnäytetyön tarkoituksena oli selvittää hoitajien kokemuksia työkierrosta eräillä yliopistollisen sairaalan osastoilla. Tavoitteena oli antaa tietoa osastojen henkilökunnalle työkierron toimivuudesta. Tavoitteena oli, että kyselyn tuloksia voitaisiin käyttää apuna työkierron toimivuuden arvioinnissa ja mahdollisessa kehittämisessä. Opinnäytetyön tehtävinä oli selvittää mitä työkierto on, miten osaston työntekijät kokivat työkierron toimivuuden osastoilla ja miten osastojen työntekijät...

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

    Indian Academy of Sciences (India)

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

  20. Optical response of DyN

    Czech Academy of Sciences Publication Activity Database

    Azeem, M.; Ruck, B.J.; Le, B.D.; Warring, H.; Strickland, N.M.; Koo, A.; Goian, Veronica; Kamba, Stanislav

    2013-01-01

    Roč. 113, č. 20 (2013), "203509-1"-"203509-6" ISSN 0021-8979 R&D Projects: GA ČR GAP204/12/1163 Institutional support: RVO:68378271 Keywords : semiconductor * band gap * phonon * DyN Subject RIV: BM - Solid Matter Physics ; Magnetism Impact factor: 2.185, year: 2013

  1. Hvem er vi? Hvem er de?

    DEFF Research Database (Denmark)

    Kryger, Niels

    2016-01-01

    Kommentaren tager afsæt i initiativer i de pædagogiske faglige foreninger i Europa EERA) og i Norden (NERA) og argumenterer for at det er forpligtelse for os som nordiske og europæiske pædagogiske forskere at gå op imod de stadigt mere ekskluderende vi-konstruktioner, som er blevet formuleret i f...

  2. BADANIA WPŁYWU PODATNOŚCI PODPÓR NA NOŚNOŚĆ SPRĘŻONYCH PŁYT KANAŁOWYCH

    Directory of Open Access Journals (Sweden)

    Przemysław BODZAK

    2016-07-01

    Full Text Available W artykule przedstawiono wyniki badań sprężonych płyt kanałowych opartych na podporach sztywnych (badanie normowe oraz na podporach podatnych. Podpory podatne stanowiły belki stalowe umieszczone na obu końcach płyty. Zbadano dwa warianty płyt o pięciu kanałach, tj. HC320 oraz HC400. Obciążenie liniowe przykładano, zgodnie z procedurą normową, za pośrednictwem kształtownika stalowego. Badania wykazały, że w przypadku płyt HC umieszczonych na podporach podatnych nośność na ścinanie takich elementów jest zdecydowanie mniejsza w porównaniu z płytami badanymi na  podporach sztywnych. Zaobserwowana różnica nośności związana jest z wpływem sztywności poprzecznej przekroju płyty na rozdział siły tnącej na poszczególne żebra. Wpływ ten powinien zostać uwzględniony w obliczeniach statycznych i wytycznych projektowych.

  3. Phase equilibria in Dy-Cu-Al system at 500 deg C

    International Nuclear Information System (INIS)

    Kuz'ma, Yu.B.; Milyan, V.V.

    1989-01-01

    Using the methods of X-ray diffraction analysis a diagram of phase equilibria in Dy-Cu-Al system at 500 deg C is plotted. Boundaries of solid solutions on the basis of DyCu 2 , DyCu and DyAl 2 compounds are determined and homogeneity regions of ternary compounds Dy 2 (Cu, Al) 7 and Dy(CuAl) 5 are ascertained. Compounds DyCuAl 3 , Dy 4 Cu 4 Al 11 and Dy 5 Cu 6 Al 9 have been detected for the first time

  4. Ideologi er noget bras

    DEFF Research Database (Denmark)

    Hansen, Brian Benjamin; Jøker Bjerre, Henrik

    medieområdet kan dette skifte betragtes som den endelige sejr for den post-ideologiske konsensus, der går ud fra, at der ikke mere er behov for politisk diskussion, og at vi aldrig mere skal indlade os på farlige politiske eksperimenter. Ideologi er noget bras, sagde jo allerede Poul Schlüter. Med inspiration......, ideologiske ramme for vore liv. Ideologi er noget bras, men bras er også ideologi....

  5. Puf er plat

    DEFF Research Database (Denmark)

    Hansen, Pelle Guldborg; Zeller, Clara

    2015-01-01

    Der er stort set ingen, der har fattet, hvad nudging egentlig er. Et nudge er nemlig hverken ”et lille blidt skub”, eller ”en helt ny videnskabelig metode [der] kan ændre vores adfærd, uden vi opdager det - og uden det koster os noget”, ligesom det heller ikke er ”en måde at friste kunder til at ...

  6. Virtuaalinen voimaantuminen - Tapaustutkimus ammattikasvatuksen oppimisympäristön toimintaedellytysten ja tietokäytäntöjen kehitysmahdollisuuksista vuorovaikutteisen tieto- ja viestintäteknologian näkökulmasta

    OpenAIRE

    Oesch, Klaus

    2007-01-01

    Tutkimuksen kohteena tietoajan toimintakäytännöt Tietoajan oppimisen tietokäytännöt perustuvat teknologiainfrastruktuurin innovatiiviseen hyödyntämiseen. Virtuaalinen voimaantuminen - tutkimus tarkastelee poikkititeisesti kolmea integroituvaa tieteenaluetta, jotka vaikuttavat oppimisen trialogisen mallin kehittymiseen; media- ja tietoteknologian, tutkivan oppimisen ja tietämyksen luomisen sekä yhteisöllisen, lisäarvoa luovan viestinnän kehitystä. Mediateknologia muuntaa ammattikasvatuksen...

  7. Cybermagt er spoilermagt

    DEFF Research Database (Denmark)

    Nyemann, Dorthe Bach

    Cybermagt er spoilermagt. Det er overskriften på denne rapport, hvis hovedformål er at indkredse, hvilken rolle magt i cyberspace spiller for forholdet mellem stater. Rapporten undersøger cybermagtens centrale betydning for den øgede destabilisering af internationale relationer, mens den samtidig...... cyberspace via fælles initiativer....

  8. Man er aldrig alene

    DEFF Research Database (Denmark)

    Hoffmeyer, Jesper

    2013-01-01

    Nu ved vi, at der er mange slags DNA i vores krop, og at samarbejdet mellem de organismer, som bærer alt dette DNA, er essentielt for vores overlevelse" … "Kroppen er en slags økosystem, hvor alle slags samarbejde hen ad vejen bliver afprøvet"...

  9. Er alt design?

    DEFF Research Database (Denmark)

    Michelsen, Anders Ib; Engholm, Ida

    2016-01-01

    Design er et ord med mange betydninger. Hvad enten design er det, der kommer ud af en shoppingtur, om det indgår i et dannelsesbegreb, hvor den kultiverede og ”gode stol” har sin plads, er en uddannelse med forskning underneden eller en strategisk indsats for velfærdssamfundets forvandling til et...

  10. Crystal structure and Mössbauer studies of the isotypic Fe6-cluster compounds RE15[Fe8C25], RE=Dy, Ho

    KAUST Repository

    Davaasuren, Bambar

    2015-05-01

    The carboferrates RE15[Fe8C25] (RE=Dy, Ho) were prepared from mixtures of the elements by arc-melting followed with subsequent annealing at 1373 K. The crystal structures were determined from single crystal X-ray diffraction data and revealed an isotypic relationship to Er15[Fe8C25] (hP48, P321). The main feature of the crystal structure is given by Fe6 cluster units characterized by covalent Fe-Fe bonding interactions. 57Fe Mössbauer spectra of Dy15[Fe8C25] were fitted by three subspectra with relative spectral weights of about 3:3:2 which is in general agreement with the crystal structure. Below 50 K, an onset of magnetic hyperfine fields at the three iron sites is observed which is supposed to be caused by dipolar fields arising from neighboring, slowly relaxing Dy magnetic moments.

  11. [Cloning of the gene for thermostable Thermus aquaticus YT1 DNA polymerase and its expression in Escherichia coli].

    Science.gov (United States)

    Patrushev, L I; Valiaev, A G; Golovchenko, P A; Vinogradov, S V; Chikindas, M L; Kiselev, V I

    1993-01-01

    Using the phasmid vector pSL5, the genomic DNA fragment of T. aquaticus YT1 which contained the thermostable DNA polymerase (Taq-polymerase) gene was cloned. The BglII fragment of this genome locus was subcloned in the BamHI site of the pUC19 plasmid. To optimize the Taq-polymerase gene expression in E. coli cells, the gene was cloned in the correct reading frame regarding the initiation ATG codon of the pPR-TGATG-1 expression vector. The gene expression in this vector was controlled by the phage lambda PR promoter and the temperature-sensitive phage lambda repressor. We used PCR to amplify the short 5'-end fragment of the Taq-polymerase gene coding for the part into which an artificial SacI site was introduced. This site has been used for cloning the PCR product into the pPR-TGATG-1 vector, and the missing gene part was cloned into the KpnI site of the PCR product from the natural cloned gene. The cells of the E. coli PVG-A1 strain, which was obtained in the end, expressed efficiently the Taq-polymerase gene at the nonpermissive temperature. The content of the recombinant Taq-polymerase in the cells was about 1-2% of total proteins. The purified nearly homogeneous Taq-polymerase amplified efficiently in the PCR DNA fragments up to 5.5 kb long and was useful in DNA sequencing the by Sanger method. The half-life of the purified Taq polymerase was about 60 min at 95 degrees C, it was active for at least 65 standard PCR circles. The specific activity of recombinant enzyme preparations was about 180-200,000 units per mg of protein. The E. coli PVG-A1 strain enables one to isolate up to 500,000 units of purified enzyme from 2 l of bacterial culture.

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

    CERN Document Server

    Cheng, X Q

    2003-01-01

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

  13. 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...

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

    International Nuclear Information System (INIS)

    Ferro F, G.; Garcia S, L.; Monroy G, F.; Tendilla, J.I.; Pedraza L, M.; Murphy, C.A. de

    2002-01-01

    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 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)

  15. Materials for ER Fluids

    Science.gov (United States)

    Bloodworth, Robert; Wendt, Eckhard

    Recent improvements in the physical understanding of ER fluids have led to the rational design of new ER materials with improved properties. This paper gives an overview of several recent developments in the formulation of ER fluids, concentrating on new particulate phases for ER dispersions. Examples of homogeneous ER fluids are also discussed. The trend leading to designed ER dispersions is demonstrated by a new class of electrorheological fluids based on non-aqueous polyurethane dispersions. The fluids exhibit an attractive combination of properties: low viscosity, high ER effect, and low conductivity. The dispersed phase consists of a specially developed polyurethane elastomer which solvates and stabilizes metal salts. The polymer network density influences the mobility of the dissolved ions, allowing a surprising degree of control over the ER effect. Properties such as the field strength dependence of the ER-effect, switching response, and conductivity of these fluids correlate directly with changes in the polymer structure. Electrorheological measurements in a couette viscometer (shear-mode) and in a model shock absorber (flow-mode) using a commercial polyurethane-based fluid show that the ER effect is also dependent upon the shearing geometry.

  16. White light generation in Dy3+-and Ce3+/Dy3+-doped zinc–sodium–aluminosilicate glasses

    International Nuclear Information System (INIS)

    Caldiño, U.; Lira, A.; Meza-Rocha, A.N.; Pasquini, E.; Pelli, S.; Speghini, A.; Bettinelli, M.; Righini, G.C.

    2015-01-01

    A spectroscopic investigation of 1% Dy 2 O 3 -singly doped and 0.5% Ce 2 O 3 -1.0% Dy 2 O 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 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 −25 cm 2 s) were estimated for the dysprosium 4 F 9/2 level luminescence, which might also make the Dy 3+ -doped glass a promising gain medium for solid state yellow laser pumped by GaN LEDs. In the Ce 3+ /Dy 3+ -codoped glass a radiative energy transfer from Ce 3+ to Dy 3+ is observed upon UV excitation (310–365 nm), with a Ce 3+ to Dy 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 3+ (ZNDy). • ZN glasses are optically activated with Ce 3+ /Dy 3+ (ZNCeDy). • Dy 3+ is sensitized by Ce 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

  17. Tunnustamisoikeudenkäynti : Ensimmäisen vuoden oikeuskäytäntö käräjäoikeuksissa

    OpenAIRE

    Piltonen, Laura

    2016-01-01

    Opinnäytetyön aiheena on tunnustamisoikeudenkäynti ja menettelyssä toteutunut ensimmäisen vuoden oikeuskäytäntö. Opinnäytetyön tarkoituksena on esitellä vuoden 2015 alusta voimaan tullutta tunnustamisoikeudenkäyntiä menettelynä, sen ominaispiirteitä, käyttöönoton syitä ja itse oikeusprosessia sekä tunnustamisoikeudenkäynnin pohjalla olevaa syyteneuvottelua ja neuvottelun tuloksena syntyvää tuomioesitystä. Menettelykuvauksen lisäksi opinnäytetyössä tutkitaan kattavasti tunnustamisoikeudenkäynn...

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

    Indian Academy of Sciences (India)

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

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

    Indian Academy of Sciences (India)

    The highest improvement was obtained by SiO2–MG-coated cotton fabrics as well as composites of SiO2–TiO2–MG-dyed cotton fabrics at highest silica content. The MG-nanosols composite silica–titania dyed cotton fabric has also shown remarkable antibacterial activity over Staphylococcus aureus and Escherichia coli.

  20. Effect of separated layer thickness on magnetoresistance and magnetic properties of Co/Dy/Co and Ni/Dy/Ni film systems

    Science.gov (United States)

    Shabelnyk, T. M.; Shutylieva, O. V.; Vorobiov, S. I.; Pazukha, I. M.; Chornous, A. M.

    2018-01-01

    Co(5 nm)/Dy(tDy)/Co(20 nm)/S and Ni(5 nm)/Dy(tDy)/Ni(20 nm)/S trilayer films are prepared by electron-beam sputtering to investigate the influence of dysprosium layer thickness (tDy) and thermal annealing on the crystal structure, magnetoresistance (MR) and magnetic properties of thin films. The thickness of Dy layer changed in the range from 1 nm to 20 nm. The samples annealed for 20 min at 700 K. Electron diffraction patterns reveal that the as-deposited and annealed systems Co/Dy/Co and Ni/Dy/Ni had fcc-Co + hcp-Dy and fcc-Ni + hcp-Dy phase state, respectively. It is also shown that at the tDy = 15 nm the transition from amorphous to crystalline structures of Dy layer is observed. An increase in the Dy layer thickness results in changes in the MR and magnetic properties of the trilayer systems. It is shown that MR is most thermally stable against annealing to 700 K at tDy = 15 nm for Co/Dy/Co as well as for Ni/Dy/Ni. For tDy = 15 nm the, value of MR for both system increases by two times compared to those of pure ferromagnetic (FM) samples. The coercivity (Bc), remanent (Mr) and saturation (Ms) magnetization of the in-plain magnetization hysteresis loops are related to the Dy layer thickness too. The coercivity depends on the FM materials type and diffusion processes at the layer boundary. Accordingly, Mr and Ms are reduced with tDy increasing before and after annealing for both trilayer systems.

  1. ProDy: protein dynamics inferred from theory and experiments.

    Science.gov (United States)

    Bakan, Ahmet; Meireles, Lidio M; Bahar, Ivet

    2011-06-01

    We developed a Python package, ProDy, for structure-based analysis of protein dynamics. ProDy allows for quantitative characterization of structural variations in heterogeneous datasets of structures experimentally resolved for a given biomolecular system, and for comparison of these variations with the theoretically predicted equilibrium dynamics. Datasets include structural ensembles for a given family or subfamily of proteins, their mutants and sequence homologues, in the presence/absence of their substrates, ligands or inhibitors. Numerous helper functions enable comparative analysis of experimental and theoretical data, and visualization of the principal changes in conformations that are accessible in different functional states. ProDy application programming interface (API) has been designed so that users can easily extend the software and implement new methods. ProDy is open source and freely available under GNU General Public License from http://www.csb.pitt.edu/ProDy/.

  2. Vreden er over os

    DEFF Research Database (Denmark)

    Mehlsen, Camilla

    2006-01-01

    Urolige elever, cyklister - der giver fuck-finger, aggressive demonstranter. Samtiden er på vej ind i en æra domineret af vrede, siger rektor Lars-Henrik Schmidt, der er aktuel med bogen 'Om vreden'. Udgivelsesdato: Juni...

  3. MIT HJEM ER HVOR MIT HJERTE ER

    DEFF Research Database (Denmark)

    Høst, Jeppe Engset

    2014-01-01

    Ideen om at arbejde med det man kalder de stedbundne ressourcer på en ny måde, er relevant på Bornholm hvor events som blandt andet festivalen ’Wonderfestiwall’, strandfesten ’Vang Pier Beach Party’, karnevallet ’Svaneke Beach Party, kokkekonkurrencen ’Sol over Gudhjem’ og filmfestivalen ’Bornsho...

  4. Muzeum módy - Tokyo 2010

    OpenAIRE

    Kráľová, Zuzana

    2010-01-01

    navrhovaný objekt je múzeum módy pre mesto Tokio. Múzeum sa bude nachádzať na pulzujúcej tepne tokijského módneho diania. Navrhovaná budova presahuje 100m výšky a jej zbierky mapujú vývoj svetovej módy 20.storčia. Taktiež je dejiskom konania živých módnych show a priestorom pre prezentáciu tvorby mladých módnych tvorcov. Samotné artefakty zbierky sú vystavované jednotným systémom - zavesením. visiace figuríny prechádzajú kontinuálne celým výstavným priestorom, návštevníkovi je umožnený pohyb ...

  5. Terminologia työvälineenä – aikamuotojärjestelmästä ja sen opetuskäytänteiden ergonomiasta S2-opetuksessa

    Directory of Open Access Journals (Sweden)

    Maria Kok

    2012-10-01

    Full Text Available Artikkeli käsittelee kahta ongelmalliseksi osoittautunutta verbien tempusnimitystä, perfektiä ja imperfektiä. Tarkastelen kirjoituksessani nimitysten välittämää informaatiota, jota vertaan S2-oppikirjoissa aikamuotojen käytöstä annettuun tietoon. Kriittisen katsauksen tavoitteena on osoittaa harhaanjohtavien termien haitta ja hyvän metakielen tarve sekä myös pohtia keinoja virheellisten nimitysten korjaamiseksi. Teoreettisena viitekehyksenä on työolosuhteita, työvälineitä ja työtapoja tutkiva ergonomia. Koska kielen opetus ja opiskelu ovat työtä ja metakieli on työväline, jolla opettaja ja opiskelijat yhdessä työskentelevät, on käytettävän termistön ammatillinen ja käytännönläheinen arviointi tarpeen. DOI: http://dx.doi.org/10.5128/LV22.04

  6. Development of separation process of Dy, Y, Tm and Yb from heavier rare earth residue by solvent impregnated resin

    International Nuclear Information System (INIS)

    Shibata, J.; Matsumoto, S.

    1998-01-01

    Full text: Heavier rare earth which is contained in a small amount in ores such as bastnesite and monazite has been accumulated as heavier rare earth residue without doing separation and purification due to lack of suitable methods. The heavier rare earth residue includes seven rare earth elements such as Tb, Dy, Ho, Y, Er, Tm and Yb. Separation and recovery process of Dy, Y, Tm and Yb from leached solution of the heavier rare earth residue was investigated by using a column method with a solvent impregnated resin. The solvent impregnated resin was prepared by impregnation of organophosphorous extractant whose trade name is PC-88A into a macro porous resin, Amberlite XAD-7. It was almost impossible to separate them in simple adsorption and elution steps. However, we attained to individually separate Dy, Y, Tm and Yb from the leached solution first by changing eluent concentration gradually from pH 2 to 2mol/ l HCl in the elution step, and secondly by using a development column and changing eluent concentration in the elution step. The separation process flow was proposed for heavier rare earth residue by using the solvent impregnated resin method

  7. 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.

  8. er 2000

    DEFF Research Database (Denmark)

    Jensen, J. P.; Søndergaard, M.; Jeppesen, E.

    -kommunale data og rapporter af over-vågningen af de ferske vande. Rapporten Marine områder - Status over miljøtilstanden i 2000 er ba-seret på amtskommunale data og rapporter af overvågningen af kystvande og fjorde samt Dan-marks Miljøundersøgel-sers og vore nabolandes over-vågning af de åbne havområder....... Rapporten Landover-vågningsoplande er baseret på data indbe-rettet af amtskommuner-ne fra 7 overvågnings-oplande og er ud-arbejdet i samarbejde med Danmarks Geologi-ske Un-dersøgel-ser. Endelig er rapporten Atmosfærisk deposition 2000 baseret på Danmarks Miljø-undersø-gelsers overvågning af luftkvaliteten i...

  9. Jeg Er blevet FRANKofil

    DEFF Research Database (Denmark)

    Andersson, Lasse

    2014-01-01

    forhold til Frank, så har jeg holdt mig i skindet og har 5 timer tilbage med iPad og Frank Underwood….og hvilke timer! Hvorfor bruger jeg nu min klumme på Frank og Netflix? For det første så er House of Cards i mine øjne kunst og kultur. For det andet så er det sikkert, at streaming-tjenesterne kommer til...

  10. er 1999

    DEFF Research Database (Denmark)

    Jensen, J. P.; Søndergaard, M.; Jeppesen, E.

    små cladoceer og hjuldyr, og især er maksimumsforekom-sterne af calanoide vandlopper og de små og store cladoceer og daf-nier gået tilbage. Den gennemsnitlige biomasse af dafnier er derimod øget især p.g.a. stigning i de 25 % af søerne med størst forekomster. Dyreplanktons græsning Betragtet under et...

  11. Double dimethylammonium sulphates of Tb, Dy, Ho, Er, Tm, Yb, Lu and Y

    International Nuclear Information System (INIS)

    Jordanovska, V.B.; Siftar, J.

    1986-01-01

    Double sulfates of rare earths with dimethylammonium were studied by means of thermogravimetry, derivative thermogravimetry and differential thermal analysis from 20 to 700 deg C. Quantitative gravimetric analysis was used for the determination of rare earths and sulfate. The mechanism of thermal decomposition is also suggested. (author)

  12. Faraday effect in γ-Dy2S3 and c-Dy2O3 paramagnetic crystals

    International Nuclear Information System (INIS)

    Shelykh, A.I.

    1987-01-01

    Studies of spectral and temperature dependences of Faraday effect in γ-Dy 2 S 3 and C-Dy 2 O 3 paramagnetic crystals are conducted. Paramagnetism of these crystals is brought about by Dy 3+ ions. Estimation of the effect of such factors as the value of paramagnetic ion concentration, width of the forbidden band, crystallochemical composition on magnetooptical effect in the considered compounds of dysprosium is carried out on the basis of the obtained experimental data and theoretical analysis. It is shown, that the Faraday effect in the considered compounds of dysprosium as well as the value of paramagnetic moment may be regarded rather accurately in free ion approximation

  13. 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.

  14. A study of the structure of 162Dy through the (n,γ) and (n,e-) reactions

    International Nuclear Information System (INIS)

    Warner, D.D.; Shi, Z.R.; Gelletly, W.; Borner, H.G.; Hoyler, F.; Schreckenbach, K.; van Isacker, P.

    1987-01-01

    The level structure below 2 MeV in 162 Dy has been investigated using the 161 Dy(n,γ) 162 Dy and 161 Dy(n,e - ) 162 Dy reactions. The results for the positive parity excitations are discussed within the framework of an Interacting Boson Approximation (IBA-2) calculation. 7 refs., 1 fig., 1 tab

  15. Dipolar Spin Ice States with a Fast Monopole Hopping Rate in CdEr2X4 (X =Se , S)

    Science.gov (United States)

    Gao, Shang; Zaharko, O.; Tsurkan, V.; Prodan, L.; Riordan, E.; Lago, J.; Fâk, B.; Wildes, A. R.; Koza, M. M.; Ritter, C.; Fouquet, P.; Keller, L.; Canévet, E.; Medarde, M.; Blomgren, J.; Johansson, C.; Giblin, S. R.; Vrtnik, S.; Luzar, J.; Loidl, A.; Rüegg, Ch.; Fennell, T.

    2018-03-01

    Excitations in a spin ice behave as magnetic monopoles, and their population and mobility control the dynamics of a spin ice at low temperature. CdEr2 Se4 is reported to have the Pauling entropy characteristic of a spin ice, but its dynamics are three orders of magnitude faster than the canonical spin ice Dy2 Ti2 O7 . In this Letter we use diffuse neutron scattering to show that both CdEr2 Se4 and CdEr2 S4 support a dipolar spin ice state—the host phase for a Coulomb gas of emergent magnetic monopoles. These Coulomb gases have similar parameters to those in Dy2 Ti2 O7 , i.e., dilute and uncorrelated, and so cannot provide three orders faster dynamics through a larger monopole population alone. We investigate the monopole dynamics using ac susceptometry and neutron spin echo spectroscopy, and verify the crystal electric field Hamiltonian of the Er3 + ions using inelastic neutron scattering. A quantitative calculation of the monopole hopping rate using our Coulomb gas and crystal electric field parameters shows that the fast dynamics in CdEr2X4 (X =Se , S) are primarily due to much faster monopole hopping. Our work suggests that CdEr2X4 offer the possibility to study alternative spin ice ground states and dynamics, with equilibration possible at much lower temperatures than the rare earth pyrochlore examples.

  16. Ondskaben er fortryllende

    DEFF Research Database (Denmark)

    Schubart, Rikke

    2013-01-01

    Indlæg om tv-serien Once Upon a Time (2011-), der hører til genren fairytale fantasy, der blander eventyr og fantasy. Her bliver alle eventyr brugt i en fortælling om alle beboere i en lille by, der ikke ved, at de i virkeligheden er eventyr-karakterer.......Indlæg om tv-serien Once Upon a Time (2011-), der hører til genren fairytale fantasy, der blander eventyr og fantasy. Her bliver alle eventyr brugt i en fortælling om alle beboere i en lille by, der ikke ved, at de i virkeligheden er eventyr-karakterer....

  17. Er Isak bare paranoid?

    DEFF Research Database (Denmark)

    Raun, Tobias

    2017-01-01

    Med afsæt i hovedpersonen fra tredje sæson, Isak, ser artiklen nærmere på homoseksualitet og maskulinitet. I artiklen introduceres og anvendes centrale queer teoretiske begreber som ’homosocialitet’ og ’heteronormtivitet’. Der vises hvordan fællesskaberne i serien er bygget op omkring stærke homo...

  18. Scenen er blevet din

    DEFF Research Database (Denmark)

    Helms, Niels Henrik

    2008-01-01

    Verden kan betragtes som en skueplads med mange forskellige scener. I bidrgaet vil læseren kunne stifte bekendtskab med forskellige refleksioner over netop denne metaforik som analyseoptik i forhold til begrebet innovation. Afsættet er ønsket om at finde en måde at analysere og begrebsliggøre inn...

  19. Er tang fremtidens superfood?

    DEFF Research Database (Denmark)

    Holdt, Susan Løvstad

    seneste år fået øjnene op for tang indenfor områderne: biokemikalier og bioaktive stoffer, ekstraktion, gastronomi, produktudvikling, foder, bioraffinaderier, dyrkning osv. Men hvad er det tang kan? Dette foredrag vil vise at vi med tangdyrkning kan rykke mere bæredygtig fødevareproduktion ud på havet...

  20. Er praksis prima?

    DEFF Research Database (Denmark)

    Holm, Claus

    2006-01-01

    Tiltroen til praktisk sans er i vækst, mens den teoretiske fornuft møder skepsis. Paradoksalt nok rammer den antiteoretiske bevægelse også universiteterne. To forskere advarer mod, at samfundet forlader sig på praksis....

  1. Riget - alt er tilladt

    DEFF Research Database (Denmark)

    Agger, Gunhild

    2017-01-01

    Riget indtager en nøglestilling, når overgangen mellem faser i Triers produktion skal karakteriseres. Riget danner bro mellem den billedfascination og de radikale stileksperimenter, der præger Triers tidlige produktion, og den genre- og plotbevidsthed, der er typisk for film som Breaking the Waves...

  2. Hvad er tidligt sprog

    DEFF Research Database (Denmark)

    Skriver Jensen, Anders

    2009-01-01

    Forfatteren argumenterer for at "early literacy" kan oversættes til "tidligt sprog"; særligt når der er tale om en helhedsorienteret tilgang med vægt på sprog som et alsidigt medie for kommunikation- og betydningsskabelse. Med inspiration fra Jerome Bruners kulturpsykologi diskuteres mulige...

  3. Er danskerne racister

    DEFF Research Database (Denmark)

    Bech, Henning; Necef, Mehmet Ümit

    Igennem de seneste årtier er det blevet almindeligt at tale om, at der er en udbredt racisme i Danmark. Påstande om danskernes racisme, fremmedhad og diskrimination optræder dagligt i offentligheden og i medierne, og der henvises ofte til, hvad ’forskerne’ og de ’videnskabelige undersøgelser’ siger...... om emnet. Der kan da næppe heller være tvivl om, at der forekommer racistiske holdninger hos nogle danskere. Men er problemet så stort, som det gøres til i den offentlige debat? Bogen ønsker at afklare, hvorvidt der er videnskabelig dokumentation for påstandene om danskernes racisme. Den går i dybden...... med en række forskeres og eksperters udtalelser på området og præsenterer en grundig analyse af deres fremstilling af dansk racisme i forhold til emner som kultur, seksualitet, kriminalitet og arbejdsmarked....

  4. Litteratur er nyttig

    DEFF Research Database (Denmark)

    Kaspersen, Peter

    2012-01-01

    Den anmeldte bog er en forskningsbaseret debatbog om hvilken nytteværdi litteratur har. Bogen placeres i sammenhæng med en række bøger på nordiske sprog og engelsk om litteraturens, litteraturundervisningens og -forskningens legitimitet. Argumentatioen i bogen bygger på Bakhtins litteratursyn, og...

  5. Crystallographic and magnetic structure of the novel compound ErGe 1.83

    Science.gov (United States)

    Oleksyn, O.; Schobinger-Papamantellos, P.; Ritter, C.; de Groot, C. H.; Buschow, K. H. J.

    1997-02-01

    The crystal structure and the magnetic ordering of the novel orthorhombic compound ErGe 2-x has been studied by neutron powder diffraction and magnetic measurements. The crystal structure belongs to the DyGe 1.85-type (space group Cmc2 1)·ErGe 2-x ( x = 0.17 (2)) orders antiferromagnetically below TN = 6 K and displays a metamagnetic behaviour. The magnetic cell has the same size as the chemical unit cell ( q = 0 ). The magnetic space group is Cmc2 1 (Sh 36173). At T = 1.5 K the magnetic moments of the two erbium sites have the same ordered magnetic moment values of 7.63 (6) μB/Er and are antiferromagnetically coupled leading to an uniaxial structure along the a direction.

  6. Rotation-induced shape transitions in Dy nuclei

    International Nuclear Information System (INIS)

    Emling, H.; Grosse, E.; Kulessa, R.; Schwalm, D.; Wollersheim, H.J.

    1984-01-01

    Lifetimes of states with spins up to 30(h/2π) have been measured in the nuclei 156 Dy, 157 Dy, and 158 Dy using the recoil-distance technique together with inverse reactions of the type Mg( 136 Xe,xn). The applied method, which benefited from the high velocities of the fusion residues as well as from improvements of the recoil-distance technique, allowed us to determine liefetimes and feeding times down to 0.1 ps. Below the first backbending the resultant B(E2) values in the ground-state band of sup(156,158)Dy increase faster with increasing rotational frequency than expected for rigid rotors, reaching values similar to those observed for the well-deformed neutron-rich Dy isotopes. In contrast to this, the E2-transition probabilities between high-spin states are clearly retarded. The retardation gradually evolves from the rotation alignment of nucleons and indicates deformation changes most likely towards a triaxial shape. From the analysis of the side-feeding times of the high-spin yrast states it could be furthermore deduced that the E2 component of the preyrast γ-decay stems from transitions along highly collective bands. (orig.)

  7. Hvid er et usynligt ideal

    DEFF Research Database (Denmark)

    Mehlsen, Camilla

    2010-01-01

    Salget af hudblegecremer er eksploderet. Hvorfor drømmer så mange om at få lys hud? Hvorfor vil børn hellere lege med hvide dukker end brune? Svaret er, at hvid er et globalt ideal. Interview med Dorthe Staunæs og Les Back....

  8. Er HR ude i tovene?

    DEFF Research Database (Denmark)

    Poulfelt, Flemming

    2015-01-01

    HR: Er der behov for nytænkning i HR-land? Artikler i Harvard Business Review - bakket op af en dansk undersøgelse - konkluderer, at HR stadig mangler gennemslagskraft i virksomhederne. Er HR ude i tovene? ... For i undersøgelsen "Ny Dansk Ledelse" (maj 2015), som er baseret på danske lederes...

  9. Facebook er internettet nu

    DEFF Research Database (Denmark)

    Tække, Jesper

    2014-01-01

    Den store vision for world wide web var, at alle kunne få ubegrænset adgang til alverdens information. www var mangfoldigt og anarkistisk. I dag er der rigtig mange, der kun bruger nettet til at være på Facebook. Hvad bruger Facebook det til? Og hvad gør det ved vores udsyn?......Den store vision for world wide web var, at alle kunne få ubegrænset adgang til alverdens information. www var mangfoldigt og anarkistisk. I dag er der rigtig mange, der kun bruger nettet til at være på Facebook. Hvad bruger Facebook det til? Og hvad gør det ved vores udsyn?...

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

    Science.gov (United States)

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

    2018-02-01

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

  11. Hvis er lovene?

    DEFF Research Database (Denmark)

    Holm, Isak Winkel

    2015-01-01

    Hvem konstituerer det politiske fællesskab, som laver lovene? Hvad sker der, når folket ikke kender lovene, eller ikke findes værdige til dem? Hvis folket udfordrede adelens love før i tiden, er det måske migranterne, der udfordrer europæernes love og konventioner i dag. Man kan med fordel gå til...... Franz Kafka for at forstå hvordan....

  12. Er havets iltminimumszoner iltfrie?

    DEFF Research Database (Denmark)

    Revsbech, Niels Peter; Larsen, Lars; Gundersen, Jens

    Den centrale del af havets ilt-minimumszoner kan være totalt iltfrie! Ved brug af STOX iltsensoren er det muligt at måle ilt med en detektionsgrænse nær 1 nM (dvs. en faktor 1000 bedre end hidtil muligt) og dermed at opnå en bedre forståelse af omsætningerne i oceanernes ilt-minimumszoner, der bl...

  13. Hvad er en by?

    DEFF Research Database (Denmark)

    Parby, Jakob; Thelle, Mikkel

    2011-01-01

    Nytænkning. Med de moderne megabyer er det slut med at forestille sig byen som noget, man planlægger og giver form. Vi skal lære at se dem som vildtvoksende urbane landskaber. Artikel om megabyer, byudvikling og forestillingen om byen gennem tiderne. Skrevet delvist i anledning af åbningen af uds...... udstillingen Citambulos på Københavns Museum, der handlede om Mexico City....

  14. Hvis er Himmeriget?

    DEFF Research Database (Denmark)

    Holst, Søren

    2007-01-01

    Udtrykket "de fattige i ånden", som kendes fra Bjergprædikenen i Matthæusevangeliet, forekommer også i to af Dødehavsrullerne. Artiklen undersøger disse tekster og argumenterer for, at udtrykket ikke betegner en særligt "åndelig" fattigdom, men derimod de konkret økonomisk fattige, som er "af ånd...

  15. Surface magnetic phase transitions in Dy/Lu superlattices

    International Nuclear Information System (INIS)

    Goff, J.P.; Sarthour, R.S.; Micheletti, C.; Langridge, S.; Wilkins, C.J.T.; Ward, R.C.C.; Wells, M.R.

    1999-01-01

    Dy/Lu superlattices comprising ferromagnetic Dy blocks coupled antiferromagnetically across the Lu blocks may be modelled as a chain of XY spins with antiferromagnetic exchange and six-fold anisotropy. We have calculated the stable magnetic phases for the cases of large anisotropy and a field applied along an easy direction. For an infinite chain an intermediate phase (1, 5,...) is predicted, where the notation gives the angle between the moment and the applied field in units of π/3. Furthermore, the effects of surface reconstruction are determined for finite chains. A [Dy 20 Lu 12 ] 20 superlattice has been studied using bulk magnetization and polarized neutron reflectivity. The (1, 5,...) phase has been identified and the results provide direct evidence in support of the theoretical predictions. Dipolar forces are shown to account for the magnitude of the observed exchange coupling. (Copyright (c) 1999 Elsevier Science B.V., Amsterdam. All rights reserved.)

  16. Modification of magnetoresistance and magnetic properties of Ni thin films by adding Dy interlayer

    Science.gov (United States)

    Vorobiov, S. I.; Shabelnyk, T. M.; Shutylieva, O. V.; Pazukha, I. M.; Chornous, A. M.

    2018-03-01

    The paper reports the influence of dysprosium (Dy) interlayer addition on structure, magnetoresistance and magnetic properties of nickel (Ni) thin films. Trilayer film systems Ni/Dy/Ni have been prepared by alternate electron-beam evaporation. It is demonstrated that all as-prepared and annealed Ni thin films have face-centered cubic structure. The composition of the samples after addition of the Dy interlayer corresponds to the combination of face-centered cubic (Ni) and hexagonal close-packed (Dy) structures. The structure of Ni/Dy/Ni film systems changes from amorphous to polycrystalline when Dy interlayer thickness (t Dy) is more than 15 nm. The value of magnetoresistance increases with the adding the Dy interlayer in both longitudinal and transverse geometries, meanwhile the anisotropic character of magnetoresistance field dependences retained. The saturation and reversal magnetizations are reduced with the increasing of the Dy thickness interlayer, while the coercivity takes the minimum value at t Dy = 15 nm. The following increasing of t Dy leads to increasing of coercivity near to three times. This result indicates the influence of the crystal structure on the magnetic properties of Ni thin films at adding Dy interlayer.

  17. Phosphors doped with Dy3+ and Gd3+ for lighting

    International Nuclear Information System (INIS)

    Su, Q; Pei, Z.; Zeng, Q.; Chi, L.

    1998-01-01

    Full text: Some heavy lanthanide ions with even atomic number such as Dy 3+ and Gd 3+ are abundant in the ion adsorption type deposit of China. Their price is cheap and they have specific spectroscopic properties which can be used as phosphors. Dy 3i on has two dominant bands in the emission spectrum. The yellow band (575 nm) corresponds to the hypersensitive transition 4 F 9/2 → 6 H 13/2 (ΔL=2, ΔJ=2), and the blue band (485 nm) corresponds to the 4 F 9/2 → 6 H 15/2 transition. Factors which influence on the yellow- to-blue intensity ratio (Y/B) were investigated. Adjusting to a suitable Y/B, Dy 3+ will emit white light with high colour temperature and can be used for lighting. But Dy 3+ ion has only narrow excitation bands of f-f transitions ranging from 300-500 nm, no broad excitation band such as charge transfer band or f-d transition band exists in the UV region 200-300 nm. Hence its luminescent efficiency is low when it is excited by UV radiation emitted from the mercury plasma. This is one of the drawbacks to its use as lamp phosphor. However, this can be overcome by sensitisation with Gd 3+ , Pb 2+ or other sensitisers such as vanadate shown in this report. Gd 3+ is not only a good matrix, but also a good sensitiser. Using its 8 S 7/2 → 6 D, 6 I and 6 P transitions, the UV excitation energy can be absorbed and transferred to the activator such as Dy 3+ . Therefore, in some cases Gd 3+ is better than Y 3+ which is optical inert as a matrix. For the phosphor Ca 1.96 Pb 0.04 RE 7.9 Dy 0.1 (SiO 4 ) 6 O 2 prepared by sol-gel method, the intensity of Dy 3+ in the Gd 3+ compound (RE=Gd 3+ ) is six times that in the Y 3+ compound. Some new phosphors doped with Dy 3+ and Gd 3+ prepared in our laboratory are reported

  18. 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)

  19. Elastic Constants of DyRhIn5

    International Nuclear Information System (INIS)

    Sanada, Naoyuki; Watanuki, Ryuta; Suzuki, Kazuya

    2012-01-01

    The components-separated magnetic transition in DyRhIn 5 was investigated by measuring the magnetic susceptibility and elastic constants. The magnetic susceptibility along the [001] direction indicates the antiferromagnetic ordering of c-component of the magnetic moments at T N = 28.1 K whereas the susceptibility along those of [100] and [110] direction show the paramagnetic behavior. The results of the elastic constant measurements suggest that the degeneracy of quadrupolar degrees of freedom exists in spite of the formation of magnetic order because the elastic softenings are observed below T N . The quadrupolar effect in DyRhIn 5 is discussed in terms of the symmetry classification.

  20. Efecte-järjestelmän hyödyntäminen ja kehittäminen ITIL-käytäntöihin pohjautuvassa palvelunhallinnassa

    OpenAIRE

    Karppanen, Ari

    2010-01-01

    Englannin hallitus aloitti 1980-luvun lopulla tutkimuksen menestyksekkäimpien organisaatioiden palvelunhallinnasta. Tutkimus tuotti kirjasarjan, joka sai nimekseen IT Infrastructure Library (ITIL). ITIL-kirjat selvittivät, kuinka IT-palvelunhallintaa voidaan käyttää liiketoiminnan tukena. Kirjasarjan kehityksen toisessa vaiheessa uudet teknologia-arkkitehtuurit, virtualisointi sekä ulkoistaminen, osoittautuivat tärkeimmiksi asioiksi. ITIL-käsitteet ovat muodostuneet johtavaksi käytännöksi IT-...

  1. Unexpected structure in the E2 quasicontinuum spectrum of 154Dy

    International Nuclear Information System (INIS)

    Holzmann, R.; Khoo, T.L.; Ma, W.C.

    1988-01-01

    The evolution of the γ quasicontinuum spectrum with neutron number has been investigated in the sequence of dysprosium isotopes /sup 152,154,156/Dy. The three nuclei display a pronounced collective E2 component. In 154 Dy this component shows an unexpected splitting into two distinct parts, signifying a structural change along the γ cascade. The E2 and statistical components can be reproduced in simple γ cascade calculations; in 152 Dy and 156 Dy only rotational bands were included, whereas in 154 Dy additional vibration-like transitions were required to reproduce the two E2 peaks. 11 refs., 2 figs

  2. Hvad er tekstfiktion?

    DEFF Research Database (Denmark)

    Widell, Peter

    2012-01-01

    artiklen er et bidrag til belysningen af genteori og bygger på ideen om at karakterisere skønlitteratur som et restringeret sæt af universelle tekstparametre. Artiklen fokuserer især på parametren tekstfiktion, hvor jeg forsvarer den position, at en fiktiv tekst hverken kan karakteriseres som en ...... intentioner. Det betyder dog ikke, at sandhed og mening ikke spiller noget rolle ved identifikationen af fiktion, sådan som det hævdes af Walsh og andre....

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

    Indian Academy of Sciences (India)

    Administrator

    Wash fastness improvement of malachite green-dyed cotton fabrics coated with nanosol composites of silica–titania. I KARTINI1,*, I ILMI1, E S KUNARTI2 and KAMARIAH3. 1Functional Coating Materials Research Group, Department of Chemistry, FMIPA, Universitas Gadjah Mada,. Sekip Utara, Yogyakarta 55281, ...

  4. ions (RE = La, Pr, Nd, Sm, Gd and Dy)

    Indian Academy of Sciences (India)

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

  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. Copyright © 2011 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

  6. Bulk study of a DyNiAl single crystal

    Czech Academy of Sciences Publication Activity Database

    Prchal, J.; Andreev, Alexander V.; Javorský, P.; Honda, F.; Jurek, Karel

    272-276, - (2004), e419-e420 ISSN 0304-8853 R&D Projects: GA ČR GA106/02/0943 Keywords : rare-earth * DyNiAl * magnetic anisotropy * single crystal Subject RIV: BM - Solid Matter Physics ; Magnetism Impact factor: 1.031, year: 2004

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

    African Journals Online (AJOL)

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

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

    African Journals Online (AJOL)

    GREGO

    2007-04-02

    Apr 2, 2007 ... Batch equilibration studies were conducted to determine the nature of adsorption of Zn (II) and Cu (II) onto dyed coconut pollens. The nature of adsorption of metal ions was explained using the Langmuir equation. The calculated values of equilibrium parameter indicated favourable adsorption by the.

  9. Thermal characterization of (U, Dy)O2 pellets

    International Nuclear Information System (INIS)

    Pelloni, M; Bianchi, L; Pablovich, M.E; Kaufmann, F; Kempf, R

    2012-01-01

    The thermal diffusivity of (U,Dy)O 2 pellets were determined in the temperature range 250 K to 1600 K measured by the laser flash method. The dependence of thermal with temperature and dysprosium content was studied and found in good agreement with physical models available (author)

  10. Anisotropy of the magnetocaloric effect in DyNiAl

    Czech Academy of Sciences Publication Activity Database

    Kaštil, J.; Javorský, P.; Andreev, Alexander V.

    2009-01-01

    Roč. 321, č. 15 (2009), s. 2318-2321 ISSN 0304-8853 Institutional research plan: CEZ:AV0Z10100520 Keywords : magnetocaloric effec * DyNiAl * magnetism * anisotropy Subject RIV: BM - Solid Matter Physics ; Magnetism Impact factor: 1.204, year: 2009

  11. Emission spectra of phosphor MgSO4 doped with Dy and Mn

    International Nuclear Information System (INIS)

    Zhang Chunxiang; Chen Lixin; Tang Qiang; Luo Daling; Qiu Zhiren

    2001-01-01

    Emission spectra of phosphor MgSO 4 doped with Dy and Dy/Mn were measured with an optical multichannel analyzer and a linear heating system whose temperature was controlled by a microcomputer. The emission spectrum bands at 480 nm and 580 nm of phosphor MgSO 4 doped with Dy were observed in the three dimensional (3D) glow curves. Compared with the 3D spectrum of CaSO 4 :Dy and the spectrum bands of MgSO 4 :Dy shows the same wavelengths which resulted from the quantum transitions among the energy levels of Dy 3 '+ ions. The intensities of the glow peaks in both spectrum bands (480 nm and 580 nm) of phosphor MgSO 4 doped with Dy/Mn were dramatically reduced except the 380 degree C glow peak

  12. Luminescent properties in films of ZrO2: Dy

    International Nuclear Information System (INIS)

    Martinez, R. C.; Guzman, J.; Rivera, T.; Ceron, P.; Montes, E.; Guzman, D.; Garcia H, M.; Falcony, C.; Azorin, J.

    2014-08-01

    In this work the luminescent characterization of zirconium oxide (ZrO 2 ) films impure with dysprosium (Dy +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 2 ·8H 2 O) and Dysprosium tri-chloride (DyCl 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 4 F 9/2 - 6 H 15/2 , 4 F 9/2 - 6 H 13/2 and 4 F 9/2 - 6 H 11/2 characteristics of the Dy 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 2 :Dy in function of the dose was shown lineal in the interval of 24 mJ/cm 2 to 432 mJ/cm 2 . A study of the repeatability and dissipation of the ZrO 2 :Dy Tl response is included. Considering the shown previous results we can conclude that the ZrO 2 in film form obtained by spray pyrolysis has luminescent properties in 240 nm. (Author)

  13. Luminescence studies on Dy3+ and Dy3+:Eu3+ co-doped boro-phosphate glasses for WLED applications

    Science.gov (United States)

    Vijayakumar, M.; Uma, V.; Arunkumar, S.; Marimuthu, K.

    2015-06-01

    Dy3+ and Dy3+:Eu3+ co-doped boro-phosphate glasses have been prepared and optically characterized using absorption, luminescence and decay measurements. The Nephelauxetic ratios (β), Bonding parameters (δ) and Judd-Ofelt (JO) intensity parameters Ωλ (λ = 2, 4 and 6) were calculated to study the nature of the environment around the RE3+ ions in the prepared glasses. The yellow to blue (Y/B) intensity ratio and the chromaticity color coordinates were calculated from the luminescence measurements. The lifetimes of the 4F9/2 excited level were measured using decay curves and is found to decrease in the Dy3+:Eu3+ co-doped glass due to the occurrence of resonant energy transfer between Dy3+-Eu3+ ions and the non-exponential decay rates have been fitted with Inokuti-Hirayama (IH) model. The decay curves are well fitted for S= 6 suggesting that the interaction between active ions for the energy transfer is of dipole-dipole nature.

  14. Rouw mag er zijn

    Directory of Open Access Journals (Sweden)

    Marlieke Moors

    2015-12-01

    Full Text Available ABSTRACTGrieving is allowedGrief is a human experience. Every form of loss shapes you into the human being you are today. Contrary to what earlier, unproven grief models postulate, grief does not have an end point. That is, bereavement does not have to be completely processed, but it should be integrated into someone’s life. The outdated grief models were often interpreted and used in a normative way, which led to a normative standard model. This portraits the belief that every mourner would experience similar symptoms and would go through a fixed pattern of phases. However, the updated vision emphasizes the individual and unique process of coping with loss: norms concerning grief should be banned. By means of literature research, interviews with professionals and personal experiences, it became clear that finding an equilibrium between restoration-orientated and loss-orientated coping styles is most beneficial. An important aspect in finding this balance is meaningfulness. Furthermore, the ability to bear a loss and to adapt accordingly are important components. Lastly, attaching significance to a loss is a constructive way of integrating the loss into one’s life. The death of a loved one should therefore not be forgotten or tucked away. After all, grief is the price we pay for love. SAMENVATTINGRouw mag er zijnRouw is een menselijke ervaring en elk verlies vormt je als mens. Rouw heeft, in tegenstelling tot wat de verouderde, niet bewezen rouwmodellen beweren, geen eindpunt. Verlies hoeft namelijk niet verwerkt te worden, maar moet juist geïntegreerd worden in iemands leven. De verouderde rouwmodellen zijn vaak normatief opgevat en toegepast, waaruit een normatief standaardmodel is ontstaan. Daarbij werd gedacht dat elke rouwende dezelfde symptomen zou vertonen en het rouwproces volgens vaste fasen zou verlopen. Binnen de vernieuwde visie wordt er juist van uitgegaan dat elk individu een unieke manier van reageren op rouw heeft. Er zou

  15. Alt er ændret. Intet er afklaret

    DEFF Research Database (Denmark)

    Helmersen, Ole

    2017-01-01

    Brexit kan redefinere landets internationale rolle lige så meget som Suezkrisen. Men 15 måneder efter afstemningen er der stadig ingen svar.......Brexit kan redefinere landets internationale rolle lige så meget som Suezkrisen. Men 15 måneder efter afstemningen er der stadig ingen svar....

  16. Er talesprog en medieteknologi?

    DEFF Research Database (Denmark)

    Tække, Jesper

    2013-01-01

    for den menneskelige udfoldelse. Til at løse denne opgave vil jeg trække på den tyske sociolog og systemteoretiker Niklas Luhmann der også udmærker sig som medieteoretiker (Tække 2006a). Luhmann har ikke selv direkte redegjort for sprog som teknologi, men da han både har udviklet et brugbart...... motiver og viden, må give mening til hvad, der meddeles og selektere en forståelse (Luhmann 2000a). Formålet med og berettigelsen for medieteori er ud fra Marshall McLuhans (1967) devise, om at the medium is the message, at sammenligne, hvad det betyder for menneske og samfund, at der kommunikeres i ét...

  17. Effect of Dy additions on microstructure and magnetic properties of Fe-Nd-B magnets

    International Nuclear Information System (INIS)

    Ramesh, R.; Thomas, G.; Ma, B.M.

    1987-05-01

    It is shown that increasing additions of Dy causes the remanence B/sub r/ to decrease linearly. The intrinsic coercivity, iHc, increases sharply for small additions of Dy, but the increase is not proportional for higher Dy contents. The iHc increases almost linearly with the effective anisotropy field of the RE 2 Fe 14 B phase until the Dy content is about 10% of the total rare earth content. Above this concentration, there is strong deviation from linearity. Various types of possible concentration profiles of the substituted rare earth are suggested. It is also argued that preferential segregation of Dy to the interfaces could be beneficial in increasing the nucleation field. Morphologically there is no apparent effect of Dy on the microstructure. However, in the 5 atomic % Dy sample, Dy rich oxides were observed. It is shown through Energy Dispersive Xray Spectroscopy (EDXS) line profiling that Dy partitions preferentially into the RE 2 Fe 14 B phase in all the cases. No segregation of Dy to the interphase interfaces has been detected

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

    Science.gov (United States)

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

    2015-05-15

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

  19. Isothermal sections at 500 deg C of the Dy-V-Al and Dy-Cr-Al systems in the aluminium rich regions

    International Nuclear Information System (INIS)

    Rykhal', R.M.; Zarechnyuk, O.S.; Mats'kiv, O.P.

    1979-01-01

    X-ray diffraction and microscopic analyses have been used to investigate the ternary system dysprosium-vanadium-aluminium in the aluminium rich region. In the system Dy-V-Al two ternary compounds have been found: DyV 2 Al 20 (cubic structure, CeCr 2 Al 20 type, a=14.54 A and approximately DyVAl 8 (hexagonal crystal system, structure unknown, a=10.86, c=17.71 A, c/a=1.631). In the system dysprosium-chromium-aluminium three ternary compounds have been found: DyCr 2 Al 20 (cubic structure, CeCr 2 Al 20 type, a=14.39), approximately equal to DyCrAl 8 ) hexagonal crystal system, structure type unkown a=10.75, c=17.60 A, c/a=1.637) and DyCr 4 Al 8 (tetragonal structure, CeMn 4 Al 8 type, a=8.87, c=5.04 A, c/a=0.568). Isothermal sections of the systems Dy-V-Al and Dy-Cr-Al have been plotted at 500 deg C

  20. 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.

  1. De 9 P’er

    DEFF Research Database (Denmark)

    Rennison, Betina Wolfgang

    2017-01-01

    Ledere skal i dag selv skabe deres eget rum til ledelse, men hvad er med til at sætte det, hvilke betingelser og udfordringer er der, og hvordan kan lederne skabe sig selv i et hav af forventninger? Dette katalog inviterer til refleksion herom....

  2. Fremtidens undervisningsmiljøer

    DEFF Research Database (Denmark)

    2013-01-01

    Som oplægget til dette temanummer af LOM også indikerede, så sætter vi fokus på fremtidens undervisningsmiljøer på universiteter og UCer. Fremtidens undervisningsmiljøer har mange facetter, hvilket samlingen af artikler også illustrerer. “Fremtidens Undervisningsmiljø” handler om eksisterende erf...

  3. RNA er jo bare matematik!

    DEFF Research Database (Denmark)

    Blaavand, Jakob Lindblad

    2011-01-01

    Hvordan kan man kurere sygdomme med matematiske geometriske strukturer? Det kan man i princippet, hvis de geometriske figurer er RNA-molekyler, og sygdommen skyldes syge gener.......Hvordan kan man kurere sygdomme med matematiske geometriske strukturer? Det kan man i princippet, hvis de geometriske figurer er RNA-molekyler, og sygdommen skyldes syge gener....

  4. Kollegaerne er den nye chef

    DEFF Research Database (Denmark)

    Fugl, Marie

    2008-01-01

    Den tid, hvor chefen var den, der delte skideballer ud, er slut. Rollen som 'bad cop' er overtaget af kollegateamet, der med hård hånd sørger for, at den enkelte yder sin del. Udgivelsesdato: November...

  5. Den rige personlighed er livsduelig

    DEFF Research Database (Denmark)

    Holm, Claus

    2015-01-01

    For omtrent 160 år siden formulerede Karl Marx forestillingen om en rig individualitet som det kommunistiske samfunds individideal. I dag får forestillingen relevans. Lyder det lidt besynderligt, er det ikke mærkeligt. For de fleste af os går næppe rundt og tror, at vi er lige på trapperne til...

  6. Fraflytning er ikke en naturlov

    DEFF Research Database (Denmark)

    Nørgaard, Helle

    2015-01-01

    DEBAT: Der er brug for en erkendelse af, at det ikke er en naturlov, at folk vil flytte til byerne. Forskning viser, at børnefamilier finder tryghed og ideelle rammer for familielivet på landet. Det skriver Helle Nørgaard, seniorforsker, ph.d., Statens Byggeforskningsinstitut, Aalborg Universitet....

  7. Følelsen er alt

    DEFF Research Database (Denmark)

    Bonde, Lisbeth

    forrige sekelskifte. Det gælder især de ofte mennesketomme landskabsmalerier med ensomme kastanjetræer, som sukker i efterårslyset, og parkerne med de undertiden flygtige menneskeskikkelser, der som partikler kan forsvinde i vinden. Det er alt sammen skildret med vibrerende, næsten ’sfumatiske’ konturer...

  8. Humor er en alvorlig sag

    DEFF Research Database (Denmark)

    Søltoft, Pia

    2016-01-01

    I modsætning til ironi er humor for Kierkegaard fællesskabsgivende – ironikeren hævder sig selv, men humoristen har sympati med den, man ler med. Humor er hos Kierkegaard udtryk for, at humoristen forliger sig med tilværelsen og dens luner, og dermed grænser humoren hos Kierkegaard op til det...

  9. Magnetic properties of the ternary carbide DyCoC2 studied by magnetization measurements, neutron diffraction and 161Dy Moessbauer spectroscopy

    International Nuclear Information System (INIS)

    Amanai, H.; Onodera, H.; Ohashi, M.; Matsuo, S.; Yamauchi, H.

    1995-01-01

    The magnetic properties of DyCoC 2 have been investigated by means of magnetization measurements, powder neutron diffraction and 161 Dy Moessbauer spectroscopy. The magnetization versus temperature curves of a single-crystalline sample reveal that the magnetic structure of DyCoC 2 is a simple collinear ferromagnetic one below T C =10.0 K. At 4.2 K, the magnitude of the Dy moment is 8.7(1)μ B , whose direction is defined by an angle of 38.0(5) from the a-axis toward the c-axis. The magnetic structure and the magnitude of the moment are also confirmed by the results of powder neutron diffraction experiments and 161 Dy Moessbauer spectroscopy, respectively. ((orig.))

  10. Octupolar-excitation Penning-trap mass spectrometry for Q-value measurement of double-electron capture in (164)Er.

    Science.gov (United States)

    Eliseev, S; Roux, C; Blaum, K; Block, M; Droese, C; Herfurth, F; Kretzschmar, M; Krivoruchenko, M I; Minaya Ramirez, E; Novikov, Yu N; Schweikhard, L; Shabaev, V M; Simkovic, F; Tupitsyn, I I; Zuber, K; Zubova, N A

    2011-10-07

    The theory of octupolar-excitation ion-cyclotron-resonance mass spectrometry is presented which predicts an increase of up to several orders of magnitude in resolving power under certain conditions. The new method has been applied for a direct Penning-trap mass-ratio determination of the (164)Er-(164)Dy mass doublet. (164)Er is a candidate for the search for neutrinoless double-electron capture. However, the measured Q(ϵϵ) value of 25.07(12) keV results in a half-life of 10(30) years for a 1 eV Majorana-neutrino mass.

  11. Hyperfine Structure and Isotope Shifts in Dy II

    Directory of Open Access Journals (Sweden)

    Dylan F. Del Papa

    2017-01-01

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

  12. Thermoluminescent dosemeters of CaSO4: Dy + Teflon

    International Nuclear Information System (INIS)

    Campos, L.L.

    1989-01-01

    The development of a pellet dosemeter of CaSO 4 : Dy + Teflon at the Dosimetric Materials Production Laboratory - IPEN/Brazilian CNEN-SP is presented. The pellets were produced by cold pressing and sintering a mixture of CaSO 4 : Dy and Teflon powders. The pellet characteristics from the point of view of dosimetry. A filter combination providing an energy independent response from 20 KeV to 1,25 MeV was obtained. The dosemeter consists of three pellets sealed between two thin plastic sheets and placed under plastic and lead filters. The combination of these three filters allows to determine the energy of an unknown source. (author) [pt

  13. Resonant X-ray emission spectroscopy in Dy compounds

    International Nuclear Information System (INIS)

    Tanaka, Satoshi; Okada, Kozo; Kotani, Akio.

    1994-01-01

    The excitation spectrum of the L 3 -M 5 X-ray emission of Dy compounds in the pre-edge region of Dy L 3 X-ray absorption near edge structure (L 3 -XANES) is theoretically investigated based upon the coherent second order optical formula with multiplet coupling effects. The spectral broadening of the excitation spectrum is determined by the M 5 core hole lifetime, being free from the L 3 core hole lifetime. The fine pre-edge structure of the L 3 edge due to the 2p→4f quadrupole transition can be seen in the excitation spectrum, while this structure is invisible in the conventional XANES, in agreement with the recent experimental results. We clarify the conditions for the excitation spectrum to be regarded as the absorption spectrum with a smaller width. The resonant X-ray emission spectra for various incident photon energies around the L 3 edge are also calculated. (author)

  14. Magnetoresistance anomaly in DyFeCo thin films

    International Nuclear Information System (INIS)

    Wu, J. C.; Wu, C. S.; Wu, Te-ho; Chen, Bing-Mau; Shieh, Han-Ping D.

    2001-01-01

    Microstructured rare-earth - transition-metal DyFeCo films have been investigated using magnetoresistance and extraordinary Hall-effect measurements. The Hall loops reveal variation of coercive fields depending on the linewidth and the composition of the films. The magnetoresistance curves, with changes up to as high as 1.3%, show positive/negative magnetoresistance peaks centered on the coercive fields depending on the linewidth of the films only. The variation of the coercivity can be attributed to the magnetic moment canting between the Dy and FeCo subcomponents and the existence of the diverged magnetization on the edges, and the anomalous magnetoresistance peaks observed are discussed with the existing theories. [copyright] 2001 American Institute of Physics

  15. Demographic stuDy of nasopharyngeal carcinoma in a hospital setting

    African Journals Online (AJOL)

    2008-08-08

    Aug 8, 2008 ... 15. chong, V.t., fan, y.t. and Khoo, J.B. computed tomography and MRI findings in paranasal sinuses involved with npc. Ann. Med. Singapore. 1998; 27: 800-804. 16. Kao, c.h. and ho, y.J. comparison of positron emission tomography in detection of lymph node metastasis of npc. Ann. Ontol. Rhinol. Laryngol.

  16. Performance of CaSO4:Dy detectors

    International Nuclear Information System (INIS)

    Setti, M.C.; Silva, G.R.; Pela, C.A.; Bruco, J.L.; Borges, J.C.

    2004-01-01

    CaSO 4 :Dy detectors have been used in personal dosimetry. The MRA company recently entered into the market of these detectors. Searching to assure a product quality level that would satisfy its customs most expectancies, MRA programmed several tests to qualify and quantify these detectors main characteristics, before their definitive insertion in the market. Preliminary tests furnished a value of 29,5 ± 1,2 nC for homogeneity and a maximum dispersion of 3 % for linearity . (author)

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

    Indian Academy of Sciences (India)

    Administrator

    showed that a series of ternary Mg–Cu–Dy bulk metallic glasses (BGMs) with a diameter of 4–8 mm were suc- cessfully fabricated in the system with ... rods with the maximum diameter of 6–16 mm are fabri- cated by copper-mold casting .... some minor secondary event, resulting in a large melting point of about 65 K, which ...

  18. The ternary systems Sc-Sm(Dy)-Si at 870 K

    International Nuclear Information System (INIS)

    Kotur, B.Ya.; Mokra, I.Ya.; Toporinskij, A.Ya.

    1991-01-01

    Isothermal cross sections of the ternary systems Sc-Sm-Si and Sc-Dy-Si at 870 K have been plotted. Investigation of scandium and disprosium in ternary systems have been examined by X-ray diffraction and microstructure analysis. Besides literary data on binary systems Sc-Si, Sm-Si, Dy-Si have been used. Formation of limited (Sc-Sm-Si, Sc-Dy-Si) and continuous (Sc-Dy-Si) solid solutions based on bisilicides of Sc and Sm(Dy) is discovered. Two and five ternary compounds in Sc-Sm-Si and Sc-Dy-Si systems have been determined and their crystal structure has been established. When investigating of Sc-(rare earth element)-Si ternary systems and should take into account the specific interaction of scandium and samarium with REE

  19. Magnetic structure of DyN and DyNBiM clusters isolated in a molecular beam

    International Nuclear Information System (INIS)

    Pokrant, S.; Becker, J.A.

    2001-01-01

    Molecular beam techniques allow the investigation of isolated magnetic clusters, which are ideal model systems to study the dependence of the magnetic properties on size, composition and chemical bonding. For this purpose Dy N Bi M clusters (N=13-25, M=0-2) are generated in a laser vaporization cluster source. The clusters leave the source through a liquid-He-cooled nozzle with a nozzle temperature T N =18 K and form a molecular beam. The magnetizations of the particles are studied size selectively by measuring their deflections in an inhomogeneous magnetic field. For large field strengths (B=1.0-1.6 T) saturation of the magnetization is observed. The magnetic structure of pure Dy N clusters and the influence of doping with Bi atoms is investigated experimentally

  20. Effects of Dy and Nb on the magnetic properties and corrosion resistance of sintered NdFeB

    International Nuclear Information System (INIS)

    Yu, L.Q.; Wen, Y.H.; Yan, M.

    2004-01-01

    Dy and Nb were added into the sintered NdFeB magnets with the aim of improving their magnetic properties and corrosion resistance. It was found that intrinsic coercivity of magnets is promoted whilst remanence is reduced as a result of Dy addition. Simultaneous addition of Dy and Nb not only gives rise to greatly improved coercivity, but also suppresses the undesirable effect of Dy on the remanence. The optimum magnetic properties were achieved when 1.0% Dy and 1.5% Nb were incorporated. Moreover, corrosion resistance of NdFeB magnets improves with the increase in the content of Dy and Nb

  1. Solid state reaction synthesis and luminescence properties of Dy3+-doped Gd2Mo3O9 phosphor

    International Nuclear Information System (INIS)

    Zhang Lihui; Zhong Haiyang; Li Xiangping; Cheng Lihong; Yao Li; Sun Jiashi; Zhang Jinsu; Hua Ruinian; Chen Baojiu

    2012-01-01

    Gd 2 Mo 3 O 9 phosphors with various Dy 3+ concentrations were synthesized by a traditional solid-state reaction using Na 2 CO 3 as a flux. The influence of reaction temperature and Dy 3+ -doping concentration on the crystal structure of the phosphors was examined by XRD (X-ray diffraction). The effect of Dy 3+ -doping concentration on the emissions of Mo–O bond and Dy 3+ was experimentally investigated. The energy transfers between host and Dy 3+ ions, and between Dy 3+ ions were analyzed based on both the Van Uitert and I-H models. The chromatic properties of the phosphors were also discussed.

  2. Performance of CaSO{sub 4}:Dy detectors; Desempenho de detectores de CaSO{sub 4}:Dy

    Energy Technology Data Exchange (ETDEWEB)

    Setti, M.C.; Silva, G.R.; Pela, C.A.; Bruco, J.L. [Sao Paulo Univ. (USP), Ribeirao Preto, SP (Brazil). Faculdade de Filosofia, Ciencias e Letras. Centro de Instrumentacao, Dosimetria e Radioprotecao (CIDRA); Borges, J.C. [Fapesp, Sao Paulo, SP (Brazil)

    2004-07-01

    CaSO{sub 4}:Dy detectors have been used in personal dosimetry. The MRA company recently entered into the market of these detectors. Searching to assure a product quality level that would satisfy its customs most expectancies, MRA programmed several tests to qualify and quantify these detectors main characteristics, before their definitive insertion in the market. Preliminary tests furnished a value of 29,5 {+-} 1,2 nC for homogeneity and a maximum dispersion of 3 % for linearity . (author)

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

    CSIR Research Space (South Africa)

    Pillai, SK

    2010-04-15

    Full Text Available − ions. The precipitate obtained s oven dried at 383K for 12h, powdered and calcined at 773K for 6h. A typical chemical co-precipitation techniquewas used to prepare the rare earth , 0.5, 1 and 2wt% designated as Dy-1, Dy-2, Dy-3 and Dy-4 respectively... distilled water along with centrifugation several times to eliminate Cl− , O3− and NH4 + ions (until the supernatant solution showed no precipitation for e tests for Cl− , NO3− and NH4+ ions). The precipitate obtained was oven dried at 3K for 12h...

  4. 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

    fractionated and uninterrupted absorbed doses in the megarad range with 60Co γ-rays and 10 MeV electron beams. It was found that with some systems, differences in radiation response due to dose-rate and temperature dependence can cause large systematic errors in dose interpretation. Poor reproducibility......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...

  5. AAC:n käyttö opetus- ja ohjaustilanteissa : laadullinen tapaustutkimus AAC:n käytöstä integroidussa päiväkotiryhmässä

    OpenAIRE

    Pollari, Anni

    2011-01-01

    Pollari, Anni. AAC:N KÄYTTÖ OPETUS- JA OHJAUSTILANTEISSA. Laadullinen tapaustutkimus AAC:n käytöstä integroidussa päiväkotiryhmässä. Kasvatustieteen pro gradu –työ. Jyväskylän yliopiston kasvatustieteiden laitos, 2011. 75 sivua. Julkaisematon. TIIVISTELMÄ Tutkimus oli luonteeltaan laadullinen tapaustutkimus, jonka tarkoituksena oli selvittää, miten AAC:tä käytetään päiväkodin integroidun ryhmän opetus- ja ohjaustilanteissa. Aineisto koostui yhdeksästä videoidusta tuokiosta, joihi...

  6. Maaseudun naiset yrittäjinä. Elettyjä käytäntöjä ja jaettuja merkityksiä yrittävässä yhteiskunnassa

    OpenAIRE

    Ikonen, Hanna-Mari

    2008-01-01

    Tutkimus käsittelee maaseudun naisten yrittämistä. Tutkimus monipuolistaa vain taloudellisen perspektiivin huomioivaa tai vain kasvuyrityksistä kiinnostunutta yrittäjyystutkimusta. Se antaa uuden ja vivahteikkaan tulkinnan syrjäseuduilla elämisestä perustuessaan naisyrittäjien kokemuksiin. Tutkimus haastaa niin ikään katsomaan maaseutukehitystä kokonaisvaltaisesti ja ihmislähtöisesti. Päähuomio on Pohjois-Karjalan ja Pirkanmaan maaseutualueiden naisyrittäjien käytännöissä ja heidän yrittä...

  7. Min mentor er min voksenven

    DEFF Research Database (Denmark)

    Kaiser, Birte

    2009-01-01

    En artikel i bogen: 6 belysninger af vejledning, brydninger, forståelser & praksis. Artiklen er et sammendrag af en diskursanalyse fra 2008 fra projetrapporten: Ind under huden, www.vejledning.net...

  8. Effects of Dy, Sr and Die Casting on Microstructure, Mechanical and Corrosion Properties of Mg-Dy-Sr-Nd-Zr Alloys

    Science.gov (United States)

    Liu, Dexue; Yin, Xunyan; Pang, Xin; Hu, Shiwen; Ding, Yutian

    2017-08-01

    By adding 2, 6 and 10 wt.% Dy and 0.5, 1.5 and 2 wt.% Sr elements to Mg-2.4Nd-0.5Zr alloys and adopting die-casting process for biomedical Mg-10Dy-0.5Sr-2.4Nd-0.5Zr alloys, the effects of Dy and Sr elements and die-casting process on the microstructure, mechanical properties and corrosion resistance of Mg-Dy-Sr-Nd-Zr alloys were investigated. The new biomedical Mg-10Dy-0.5Sr-2.4Nd-0.5Zr alloys were designed, and the grain size of the as-cast new alloy was refined to 70 μm and distributed equably. The ultimate tensile strength increased with increasing Dy content and decreasing Sr content. The corrosion rate decreased firstly and then increased with increasing Dy content and decreased with increasing Sr content. By adjusting the content of Sr and Dy, the ultimate tensile strength of as-cast new Mg-10Dy-0.5Sr-2.4Nd-0.5Zr alloys increased to 203 MPa, elongation was 7.4%, and the corrosion rate decreased to 0.48 mm/a. The elongation rate increased to 10.2% after the new biomedical alloys were processed by die casting with an refine-grained microstructure of 18 μm, meanwhile the ultimate tensile strength decreased to 180 MPa, and the corrosion rate was 1.29 mm/a.

  9. Forenklingens fire F'er

    DEFF Research Database (Denmark)

    Bentzen, Tina Øllgaard

    2017-01-01

    At fjerne styring er det, man ofte forbinder med afbureaukratisering, men det er ikke tilstrækkeligt, når man vil gå fra flotte ambitioner til en styring, som reelt opleves enklere. For at forenkle må man også forandre, forankre og fastholde styring, og det må ske i et samspil mellem de aktører...

  10. Er selvmord en synd? Nej

    DEFF Research Database (Denmark)

    Andersen, Svend

    2013-01-01

    Interview med den tese at selvmord ikke kan kaldes 'synd', dels fordi dette begreb er misvisende, dels fordi der findes forskellige former for selvmord: patologisk eller velovervejet. Det sidste må respekteres som udtryk for et myndigt menneskes selvbestemmelse.......Interview med den tese at selvmord ikke kan kaldes 'synd', dels fordi dette begreb er misvisende, dels fordi der findes forskellige former for selvmord: patologisk eller velovervejet. Det sidste må respekteres som udtryk for et myndigt menneskes selvbestemmelse....

  11. 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.

  12. The hydrogenation of Dy5Pd2 followed by in situ methods

    International Nuclear Information System (INIS)

    Kohlmann, H.; Talik, E.; Hansen, T.C.

    2012-01-01

    The hydrogenation behavior of the intermetallic compound Dy 5 Pd 2 was investigated by means of ex situ X-ray powder diffraction, in situ neutron powder diffraction and in situ differential scanning calorimetry. The structural model of Dy 5 Pd 2 with a palladium atom at the 32(e) position x, x, x (x≈0.22, 7/8 occupation) and a dysprosium atom at almost the same location (x≈0.18, 1/8 occupation) is confirmed. Upon heating the latter approaches x(Pd) and at T=399 K both positional parameters are indistinguishable. Dy 5 Pd 2 does not incorporate hydrogen (deuterium) into its crystal structure, however, starting at T=495 K reacts with hydrogen to non stoichiometric dysprosium dideuteride, DyD 2+x , following a parabolic rate law. In situ differential scanning calorimetry at various hydrogen pressures up to 2.5 MPa shows strongly exothermic signals, whose temperature onset depend on the gas pressure, corresponding to the formation of a mainly ionic hydride (DyH 2+x ). - Graphical abstract: The hydrogenation of Dy5Pd2 is being followed by in situ neutron diffraction. Highlights: ► Dy5Pd2 does not form a ternary hydride upon hydrogenation. ► Dy5Pd2 decomposes to binary hydrides of dysprosium and palladium. ► At T≥399 K Dy3 and Pd in the crystal structure of Dy5Pd2 share the same position. ► The formation of DyD2+x at T=495 K and p(D2)=2.5 MPa follows a parabolic rate law.

  13. Magnetic Properties of Ternary DyMn_2X_2 Compounds (X=Si and Ge)(Magnetism)

    OpenAIRE

    Hideya, Onodera; Hisao, Kobayashi; Takahito, Ono; Masayoshi, Ohashi; Hiroshi, Yamauchi; Yasuo, Yamaguchi; Institute for Materials Research, Tohoku University; Institute for Materials Research, Tohoku University:(Present address)Electrotechnical Laboratory; Institute for Materials Research, Tohoku University:(Present address)Research Laboratory, Oki Electric Industry Co. Ltd.; Institute for Materials Research, Tohoku University; Institute for Materials Research, Tohoku University; Institute for Materials Research, Tohoku University

    1993-01-01

    Magnetic properties of DyMn_2Si_2, DyMn_2Ge_2 and their mixed compounds DyMn_2(Si_Ge_x)_2, which display a variety of interesting magnetic behaviors originating in competing magnetic interactions and anisotropy, have been investigated systematically by magnetization mesurements ^Dy Mossbauer spectroscopy and neutron diffraction experiments. This report presents a review of the results mainly obtained by the magnetization measurements.

  14. Thermal neutron detection by activation of CaSO4:Dy + KBr thermoluminescent phosphors

    International Nuclear Information System (INIS)

    Gordon, A.M.P.L.; Muccillo, R.

    1979-01-01

    Thermoluminescence (TL) studies to detect thermal neutrons were performed in cold-pressed CaSO 4 :0,1%Dy + KBr samples. The detection is based on the self-irradiation of the CaSO 4 :Dy TL phosphor by the Br isotopes activated by exposure to a mixed neutron-gamma field. (Author) [pt

  15. 26 CFR 48.4082-1 - Diesel fuel and kerosene; exemption for dyed fuel.

    Science.gov (United States)

    2010-04-01

    ... 26 Internal Revenue 16 2010-04-01 2010-04-01 true Diesel fuel and kerosene; exemption for dyed... (CONTINUED) MISCELLANEOUS EXCISE TAXES MANUFACTURERS AND RETAILERS EXCISE TAXES Motor Vehicles, Tires, Tubes, Tread Rubber, and Taxable Fuel Taxable Fuel § 48.4082-1 Diesel fuel and kerosene; exemption for dyed...

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

    Science.gov (United States)

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

    2015-01-01

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

  17. Neutron diffraction studies on La 2- Dy Ca 2 Ba 2 Cu 4+2

    Indian Academy of Sciences (India)

    Structural studies on Dy-substituted La-2125 type superconductors have been carried out by neutron diffraction experiments at room temperature using a monochromatic neutron beam of wavelength () = 1.249 Å. A series of samples with La2-DyCa2Ba2Cu4+2O stoichiometric composition, for = 0.1-0.5, have ...

  18. Lifetimes and electromagnetic transition strengths in 155Dy

    Science.gov (United States)

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

    2013-09-01

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

  19. Screening af kulturmiljøer

    DEFF Research Database (Denmark)

    2017-01-01

    Arkitektskolen Aarhus sætter fokus på kulturmiljøer i Danmarks yderområder. Screening af Kulturmiljøer (SAK) er et redskab til at vurdere kulturmiljøer ud fra aflæselige parametre, så kulturarvens værdier, egenskaber og udviklingspotentialer bliver synlige. Formålet er at skabe nye muligheder og...

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

    Science.gov (United States)

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

    2017-10-01

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

  1. 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.

  2. First-principles study of rare-earth (RE) cobaltites (RE=Nd,Sm,Gd,Dy,Er,Lu)

    Science.gov (United States)

    Topsakal, M.; Wentzcovitch, R. M.

    2014-12-01

    The lanthanide series of the periodic table comprises 15 members ranging from Lanthanum (La) to Lutetium (Lu). Although they are more abundant than silver, and some of them are more abundant than lead, they are known as rare-earth (RE) elements. The "rare" in their name refers to the difficulty of obtaining the pure elements, not to their abundances in nature. They are never found as free metals in the Earth's crust and do not exist as pure minerals. Using first-principles plane-wave calculations, we investigate the structural and electronic properties of rare-earth cobaltites (RECoO3). Structurally consistent Hubbard U treatment was shown to essential for proper description of strongly correlated cobalt-d electrons. We successfully capture the experimentally observed structural trends and give first-principles insights on interesting phenomena related with the cobalt spin state change. It was demonstrated that increase of crystal-field splitting energy between eg-t2g orbitals and shrinking of unoccupied σ*-bonding eg bands are responsible for the increase of onset spin-state transition temperature along the series.

  3. X-ray resonant magnetic scattering investigations of hexagonal multiferroics RMnO3 (R = Dy, Ho, Er)

    Energy Technology Data Exchange (ETDEWEB)

    Nandi, Shibabrata [Iowa State Univ., Ames, IA (United States)

    2009-01-01

    Electricity and magnetism were unified into a common subject by James Clerk Maxwell in the nineteenth century yielding the electromagnetic theory. Four equations govern the dynamics of electric charges and magnetic fields, commonly known as Maxwell's equations. Maxwell's equations demonstrate that an accelerated charged particle can produce magnetic fields and a time varying magnetic field can induce a voltage - thereby linking the two phenomena. However, in solids, electric and magnetic ordering are most often considered separately and usually with good reason: the electric charges of electrons and ions are responsible for the charge effects, whereas the electron spin governs magnetic properties.

  4. 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

    -field parameters for all these 15 alloy systems deduced. The consistency of the parameters was confirmed by a variety of magnetic measurements, including neutron spectroscopy. Crystal-field parameters have also been derived for the ions in pure magnetic rare-earth metals and their alloys using the results......—with the inaccuracies somewhat increased—are expected to be representative also for the magnetic rare-earth metals. For rare-earth ions in the Sc host the values B40 / β=9.9±1.9 K, B60 / γ=19.8±1.5 K, and B66 / γ=(9.4±0.9)β60 / γ were deduced. B20 / α is a host-sensitive parameter which has the average values of -102.......7, -53.4, and 29.5 K for rare-earth ions in Y, Lu, and Sc, respectively. There is also evidence that this parameter varies with the solute. B20 / α for ions in the pure magnetic rare-earth metals and their alloys shows a linear variation with c / a ratio characteristic of each ion. The results indicate...

  5. Magnetocaloric effect in (Tb,Dy,R)(Co,Fe).sub.2./sub. (R= Ho, Er) multicomponent compounds

    Czech Academy of Sciences Publication Activity Database

    Tereshina, I. S.; Politova, G.A.; Tereshina, Evgeniya; Burkhanov, G.S.; Chistyakov, O.D.; Nikitin, S. A.

    2011-01-01

    Roč. 266, č. 1 (2011), "012077-1"-"012077-5" ISSN 1742-6588. [2nd International Symposium on Advanced Magnetic Materials and Applications (ISAMMA). Sendai, 12.07.2010-16.07.2010] Institutional research plan: CEZ:AV0Z10100520 Keywords : terfenol-D * rare-earth intermetallics * magnetostriction Subject RIV: BM - Solid Matter Physics ; Magnetism

  6. Neutron diffraction with the metallic glass Ni31Dy69 (+10a/o D) using isotopic substitution

    International Nuclear Information System (INIS)

    Wildermuth, A.; Steeb, S.; Lamparter, P.

    1985-01-01

    By neutron diffraction using the method of isotopic substitution with the amorphous alloy Ni 31 Dy 69 the partial structure factors Ssub(NiNi), Ssub(DyDy), and Ssub(NiDy) were obtained, furthermore with the same specimen containing 10 a/o deuterium a partial structure factor Ssub(DD) resulted. For the evaluation of Ssub(DD) it was necessary to perform the neutron diffraction experiment with an alloy whose both components were zero scattering isotopic mixtures of Ni or Dy, respectively. (orig.)

  7. 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

  8. Crystal field interactions in DyFe2Si2 and DyFe2Ge2

    Science.gov (United States)

    Chatterji, A.; Saha, D. P.; Chatterjee, Reba; Mitra, S.

    2009-11-01

    Two sets of crystal field (CF) parameters have been proposed for DyFe2Si2, none of which could provide a simultaneous explanation of the available experimental data, particularly at low temperatures (below 100 K). The set derived from magnetic studies could not even explain the thermal variation of the magnetic specific heat reported in the same work. Although the set of CF parameters, obtained from a fit to the Mossbauer spectra, could provide a fairly good explanation of the thermal variation of the magnetic susceptibilities along the c-axis, it could not explain the observed thermal variation of other reported experimental findings. In the present work, an appraisal of the CF parameters proposed earlier has been done and a set of CF parameters has been derived, which provide a simultaneous explanation of all the available experimental data. The effect of substitution of Ge for Si on the magnetic properties and the magnetic specific heat of DyFe2Si2 has been studied in the framework of one electron crystal field model. The inelastic neutron scattering studies and EPR measurements are required to check the predicted Stark energies and the paramagnetic resonance g-values.

  9. Ro på: Solen er stille

    DEFF Research Database (Denmark)

    Pedersen, Jens Olaf Pepke

    2008-01-01

    Efter at Solen har øget sin aktivitet gennem 100 år, er der nu tydelige tegn på, at den er ved at falde til ro. Er den ved at gå i dvale? Og vil det i så fald udløse en global kuldeperiode?......Efter at Solen har øget sin aktivitet gennem 100 år, er der nu tydelige tegn på, at den er ved at falde til ro. Er den ved at gå i dvale? Og vil det i så fald udløse en global kuldeperiode?...

  10. Den sproglige leg er super fly

    DEFF Research Database (Denmark)

    Just, Sine Nørholm

    2013-01-01

    Man kan rappe om alt. I hvert fald hvis man er Marvelous Mosell. I spændingsfeltet mellem fiktion og virkelighed skaber Mosell sin persona i et forjættende 80' er-univers der på en og samme tid er vildt overdrevet og helt autentisk.......Man kan rappe om alt. I hvert fald hvis man er Marvelous Mosell. I spændingsfeltet mellem fiktion og virkelighed skaber Mosell sin persona i et forjættende 80' er-univers der på en og samme tid er vildt overdrevet og helt autentisk....

  11. N-ov-emb-er

    Indian Academy of Sciences (India)

    " to. Andrew Z Fire - Stanford University School of Medicine Stanford, CA, USA. Craig C Mello - University of Massachusetts Medical School Worcester, MA, USA. -96----------------------------~~--------R-ES-O-N-A-N-C-E--1 -N-ov-e-m-b-er--2-oo-6.

  12. Magnetic and Moessbauer studies on GdCo3B2 and DyCo3B2

    International Nuclear Information System (INIS)

    Malik, S.K.; Umarji, A.M.; Shenoy, G.K.

    1984-10-01

    Magnetization and Moessbauer studies have been carried out on GdCo 3 B 2 and DyCo 3 B 2 . These compounds are magnetically ordered with Curie temperatures of 56 0 and 21 0 K respectively. The Co atoms are either nonmagnetic or carry a small moment in these compounds. The saturation moment of DyCo 3 B 2 at 5 0 K is smaller than the Dy 3+ free-ion value. From 161 Dy Moessbauer studies, the measured hyperfine magnetic field at the Dy site is also observed to be smaller than the free-ion value. 155 Gd Moessbauer measurements in GdCo 3 B 2 reveal the presence of large crystalline electric fields at the rare earth site. This causes the moment and the hyperfine field at the Dy site in DyCo 3 B 2 to be reduced from its free-ion value

  13. 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.

  14. Physical and optical properties of lithium borosilicate glasses doped with Dy3+ ions

    Science.gov (United States)

    Ramteke, D. D.; Gedam, R. S.; Swart, H. C.

    2018-04-01

    The borosilicate glasses with Dy3+ ions were prepared by the melt quench technique with varying concentration of Dy2O3. The glasses were characterized by the density calculation, absorbance and photoluminescence (PL) spectroscopy measurements. Density and molar volume of the glasses increases with increase in Dy3+ ions in the glass matrix. This behavior is correlated with the higher molecular weight and larger ionic radius of Dy3+ ion compared to the other constituents of glass matrix. Emission of Dy3+ doped glasses showed three bands at 482, 573 and at 665 nm which correspond to 6H15/2 (blue), 6H13/2 (yellow) and 6H11/2 (red) transitions. The emission spectra of glasses with different concentration of Dy3+ ions shows that, glasses with 0.5 mol% of Dy2O3 shows highest emission and decreases with further doping. CIE 1931 chromaticity diagram showed that the emission of these glasses was in the white region. Photographs of these glasses under 349 nm Light emitting diode excitation also confirmed the white light emission from these glasses.

  15. Mechanical properties, corrosion, and biocompatibility of Mg-Zr-Sr-Dy alloys for biodegradable implant applications.

    Science.gov (United States)

    Ding, Yunfei; Lin, Jixing; Wen, Cuie; Zhang, Dongmei; Li, Yuncang

    2017-11-28

    This study investigates the microstructure, mechanical properties, corrosion behavior, and biocompatibility of magnesium (Mg)-based Mg1Zr2SrxDy (x = 0, 1, 1.63, 2.08 wt %) alloys for biodegradable implant applications. The corrosion behavior of the Mg-based alloys has been evaluated in simulated body fluid using an electrochemical technique and hydrogen evolution. The biocompatibility of the Mg-based alloys has been assessed using SaSO2 cells. Results indicate that the addition of Dy to Mg-Zr-Sr alloy showed a positive impact on the corrosion behavior and significantly decreased the degradation rates of the alloys. The degradation rate of Mg1Zr2Sr1.0Dy decreased from 17.61 to 12.50 mm year -1 of Mg1Zr2Sr2.08Dy based on the hydrogen evolution. The ultimate compressive strength decreased from 270.90 MPa for Mg1Zr2Sr1Dy to 236.71 MPa for Mg1Zr2Sr2.08Dy. An increase in the addition of Dy to the Mg-based alloys resulted in an increase in the volume fraction of the Mg 2 Dy phase, which mitigated the galvanic effect between the Mg 17 Sr 2 phase and the Mg matrix, and led to an increase in the corrosion resistance of the base alloy. The biocompatibility of the Mg-based alloys was enhanced with decreasing corrosion rates. Mg1Zr2Sr2.08Dy exhibited the lowest corrosion rate and the highest biocompatibility compared with the other Mg-based alloys. © 2017 Wiley Periodicals, Inc. J Biomed Mater Res Part B: Appl Biomater, 2017. © 2017 Wiley Periodicals, Inc.

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

    International Nuclear Information System (INIS)

    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 ∼4% expanded uniformly in-plane (0001), and ∼9% and ∼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

  17. Oxygen ordering and superconductivity in DyBaSrCu3Oy

    International Nuclear Information System (INIS)

    Wang, X.Z.; Steger, P.L.; Reissner, M.; Steiner, W.

    1992-01-01

    A new superconducting compound, DyBaSrCu 3 O y , has been synthesized. By different thermal treatments, this compound was crystallized in either orthorhombic or quasitetragonal structure, with oxygen content of y ≅ 6.93 to 6.94. Superconducting properties are similar for both phases. The magnetic moment of the Dy atoms is not influenced by the difference in structures and is close to the value for Dy 3+ . At low temperatures a tendency towards magnetic ordering was observed. (orig.)

  18. ER2OWL: Generating OWL Ontology from ER Diagram

    Science.gov (United States)

    Fahad, Muhammad

    Ontology is the fundamental part of Semantic Web. The goal of W3C is to bring the web into (its full potential) a semantic web with reusing previous systems and artifacts. Most legacy systems have been documented in structural analysis and structured design (SASD), especially in simple or Extended ER Diagram (ERD). Such systems need up-gradation to become the part of semantic web. In this paper, we present ERD to OWL-DL ontology transformation rules at concrete level. These rules facilitate an easy and understandable transformation from ERD to OWL. The set of rules for transformation is tested on a structured analysis and design example. The framework provides OWL ontology for semantic web fundamental. This framework helps software engineers in upgrading the structured analysis and design artifact ERD, to components of semantic web. Moreover our transformation tool, ER2OWL, reduces the cost and time for building OWL ontologies with the reuse of existing entity relationship models.

  19. PODAAC-ERS13-IMWF0

    Data.gov (United States)

    National Aeronautics and Space Administration — The European Remote Sensing Satellite generation 2 (ERS-2) Level 3 Mean Wind Fields dataset is derived from the ERS-2 scatterometer data and is produced and...

  20. Endoplasmic Reticulum (ER Stress and Endocrine Disorders

    Directory of Open Access Journals (Sweden)

    Daisuke Ariyasu

    2017-02-01

    Full Text Available The endoplasmic reticulum (ER is the organelle where secretory and membrane proteins are synthesized and folded. Unfolded proteins that are retained within the ER can cause ER stress. Eukaryotic cells have a defense system called the “unfolded protein response” (UPR, which protects cells from ER stress. Cells undergo apoptosis when ER stress exceeds the capacity of the UPR, which has been revealed to cause human diseases. Although neurodegenerative diseases are well-known ER stress-related diseases, it has been discovered that endocrine diseases are also related to ER stress. In this review, we focus on ER stress-related human endocrine disorders. In addition to diabetes mellitus, which is well characterized, several relatively rare genetic disorders such as familial neurohypophyseal diabetes insipidus (FNDI, Wolfram syndrome, and isolated growth hormone deficiency type II (IGHD2 are discussed in this article.

  1. Hvornår er man ung?

    DEFF Research Database (Denmark)

    Gundelach, Peter; Nørregård-Nielsen, Esther C.

    2002-01-01

    Hvornår er man ung, og hvornår er man voksen? Er der forskelle i befolkningens værdier i forhold til arbejde og politik, når det undersøges ud fra henholdsvis et alders- eller generationsperspektiv? Baseret på data fra den danske del af den internationale værdiundersøgelse vises at der er så store...

  2. Field-induced transitions in DySb

    International Nuclear Information System (INIS)

    Brun, T.O.; Lander, G.H.; Korty, F.W.; Kouvel, J.S.

    1974-01-01

    The NaCl-structured compound DySb, which in zero field transforms abruptly at T/sub N/ approximately 9.5 0 K to a Type-II antiferromagnetic (A) state with a nearly tetragonal lattice distortion, was previously found to exhibit rapid field-induced changes in magnetization at 1.5 0 K. The field-induced transitions in a DySb crystal have been studied by neutron diffraction and magnetization measurements in fields up to approximately 60 kOe applied parallel to each of the principal axes. In the broken bracket 100 broken bracket case, the transition from the A to an intermediate ferrimagnetic (Q) state is first-order at 4.2 0 K (critical field H/sub c/ approximately 21 kOe) but is continuous from approximately 6 0 K up to T/sub N/: as H/sub c/ → 0. The Q-to-paramagnetic (P) transition is rapid but continuous at 4.2 0 K (H/sub c/ approximately 40 kOe) and becomes broad as T/sub N/ is approached. In the broken bracket 110 broken bracket case the A-to-Q transition remains essentially first-order from 4.2 0 K (H/sub c/ approximately 15 kOe) up to T/sub N/; above T/sub N/ rapid P-to-Q transitions occur at very high fields. The magnetic structure of the Q state is found to be that of HoP. (U.S.)

  3. Hvor automatiseret er den danske fremstillingsindustri?

    DEFF Research Database (Denmark)

    Kromann, Lene; Sørensen, Anders

    Denne første rapport i AIM-projektet viser at der er mulighed for yderligere automation i en stor del af de danske fremstillingsvirksomheder. Gennemsnitlig er kun 30% af produktionsprocessen i virksomhederne automatiseret. Det er især inspektion og eksekvering, som mange virksomheder mangler at a...

  4. En sang der er et overlevelsesudstyr

    DEFF Research Database (Denmark)

    Kock, Christian Erik J

    2015-01-01

    Fredmans Epistel N:o 81 er en af de Bellman-sange der oftest er blevet fortolket af sangere og grupper, og som synes at være blandt hans mest virkningsfulde. Hvad er dens virkning, og hvad beror den på? Læsningen her inddrager både ord og musik, lyd og tanke....

  5. Hvorfor er sygeplejersker usynlige i offentlige medier?

    DEFF Research Database (Denmark)

    Joensen, Annemi Lund; Hall, Elisabeth

    2015-01-01

    Når der er sygeplejerelevante emner til debat i de offentlige medier på Færøerne, bærer debatten præg af sygeplejerskers manglende deltagelse. Sygeplejerskerne er usynlige. Et eksempel på dette er en debat om besparelser inden for ældreomsorgen. Til trods for at besparelsen fik omfattende konsekv...

  6. Detection of unusual spin reorientation induced by magnetic field in DyFeO3

    International Nuclear Information System (INIS)

    Balbashov, A.M.; Marchukov, P.Yu.; Nikolaev, I.V.; Rudashevskij, E.G.

    1988-01-01

    It is detected that in DyFeO 3 the vector of antiferromagnetism reorientates continuously in two mutually perpendicular planes, and transition from one plane into the other one is a first-order phase transformation

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

    Energy Technology Data Exchange (ETDEWEB)

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

    2009-10-15

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

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

    Directory of Open Access Journals (Sweden)

    A. A. Baker

    2015-07-01

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

  9. 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.

  10. Dy3+ doped tellurite glasses containing silver nanoparticles for lighting devices

    Science.gov (United States)

    Hua, Chenxiao; Shen, Lifan; Pun, Edwin Yue Bun; Li, Desheng; Lin, Hai

    2018-04-01

    Efficient warm yellowish-white fluorescence emissions of Dy3+ were observed in heavy metal germanium tellurite (HGT) glasses under the excitation of 454 nm. Further, the luminescence intensity of Dy3+ is increased by ∼29% accompanying the introduction of Ag NPs with diameter ∼7 nm when compared with that of the silver-free case, which is caused by the existence of localized surface plasmon resonance (LSPR). The larger net emission power, the more net emission photon number and the higher quantum yield in Dy2O3 doped HGT glasses containing Ag NPs (HGT-Ag) confirm the availability of utilizing laser. Presupposed fluorescence color trace reveals that white luminescence can be achieved when the intensity ratio between residual laser and Dy3+ emission reaches the appropriate range. The productive transition emissions and the tunable white fluorescence illustrate tellurite glasses embodying noble-metal NPs are a potential candidate for high-quality lighting devices.

  11. Preparation of CaSO4:Dy by precipitation method to gamma radiation dosimetry

    International Nuclear Information System (INIS)

    Rivera, T.; Roman, J.; Azorin, J.; Sosa, R.; Guzman, J.; Serrano, A.K.; Garcia, M.; Alarcon, G.

    2010-01-01

    This paper presents the results of the preparation and characterization of dysprosium-doped calcium sulfate (CaSO 4 :Dy) phosphor, which was obtained by homogeneous precipitation from calcium acetate Ca(CH 3 COO - ) 2 . Structural and morphological characteristics were studied using a scanning electronic microscope (SEM). The structure of all compounds was determined by X-ray diffraction method too. Thermoluminescence (TL) emission properties of CaSO 4 :Dy under gamma radiation effects were studied. This phosphor powder presented a TL glow curve with two peaks (Tmax) centered at around of 180 and 300 deg. C, respectively. The TL response of CaSO 4 :Dy as a function of gamma absorbed dose was linear in a wide range. Both emission and excitation spectra were also obtained. Results showed that this new preparation method of CaSO 4 :Dy TL phosphor is less expensive, cleaner and safer than the conventional preparation method.

  12. 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.

  13. 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.

  14. Selective arc-discharge synthesis of Dy2S-clusterfullerenes and their isomer-dependent single molecule magnetism.

    Science.gov (United States)

    Chen, Chia-Hsiang; Krylov, Denis S; Avdoshenko, Stanislav M; Liu, Fupin; Spree, Lukas; Yadav, Ravi; Alvertis, Antonis; Hozoi, Liviu; Nenkov, Konstantin; Kostanyan, Aram; Greber, Thomas; Wolter, Anja U B; Popov, Alexey A

    2017-09-01

    A method for the selective synthesis of sulfide clusterfullerenes Dy 2 S@C 2 n is developed. Addition of methane to the reactive atmosphere reduces the formation of empty fullerenes in the arc-discharge synthesis, whereas the use of Dy 2 S 3 as a source of metal and sulfur affords sulfide clusterfullerenes as the main fullerene products along with smaller amounts of carbide clusterfullerenes. Two isomers of Dy 2 S@C 82 with C s (6) and C 3v (8) cage symmetry, Dy 2 S@C 72 - C s (10528), and a carbide clusterfullerene Dy 2 C 2 @C 82 - C s (6) were isolated. The molecular structure of both Dy 2 S@C 82 isomers was elucidated by single-crystal X-ray diffraction. SQUID magnetometry demonstrates that all of these clusterfullerenes exhibit hysteresis of magnetization, with Dy 2 S@C 82 - C 3v (8) being the strongest single molecule magnet in the series. DC- and AC-susceptibility measurements were used to determine magnetization relaxation times in the temperature range from 1.6 K to 70 K. Unprecedented magnetization relaxation dynamics with three consequent Orbach processes and energy barriers of 10.5, 48, and 1232 K are determined for Dy 2 S@C 82 - C 3v (8). Dy 2 S@C 82 - C s (6) exhibits faster relaxation of magnetization with two barriers of 15.2 and 523 K. Ab initio calculations were used to interpret experimental data and compare the Dy-sulfide clusterfullerenes to other Dy-clusterfullerenes. The smallest and largest barriers are ascribed to the exchange/dipolar barrier and relaxation via crystal-field states, respectively, whereas an intermediate energy barrier of 48 K in Dy 2 S@C 82 - C 3v (8) is assigned to the local phonon mode, corresponding to the librational motion of the Dy 2 S cluster inside the carbon cage.

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

    International Nuclear Information System (INIS)

    Pedraza L, M.; Piedras R, J.; Ferro F, G.; Morales R, P.; Murphy S, E.; Hernandez O, O.

    2005-01-01

    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 [ 166 Dy]Dy/ 166 Ho-ethylenediaminetetramethylenephosphonate ([ 166 Dy]Dy/ 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 [ 166 Dy]Dy/ 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 166 Dy 2 O 3 enriched and it was add in form 166 DyCI 3 to the EDTMP in a softening media of phosphates (pH 8), the optimal molar relationship 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 radiochemical purity was 99% and in average the specific

  16. Tank 241-ER-311, grab samples, ER311-98-1, ER311-98-2, ER311-98-3 analytical results for the final report

    International Nuclear Information System (INIS)

    FULLER, R.K.

    1999-01-01

    This document is the final report for catch tank 241-ER-311 grab samples. Three grab samples ER311-98-1, ER311-98-2 and ER311-98-3 were taken from East riser of tank 241-ER-311 on August 4, 1998 and received by the 222-S Laboratory on August 4, 1998. Analyses were performed in accordance with the Compatibility Grab Sampling and Analysis Plan (TSAP) (Sasaki, 1998)and the Data Quality Objectives for Tank Farms Waste Compatibility Program (DQO) (Mulkey and Miller, 1997). The analytical results are presented in the data summary report (Table 1). No notification limits were exceeded

  17. A critical scattering study of the helical antiferromagnets Ho and Dy

    International Nuclear Information System (INIS)

    Gaulin, B.D.; Hagen, M.; Child, H.R.

    1988-01-01

    We have measured the frequency integrated magnetic critical scattering of neutrons from paramagnetic Dy and Ho. Analysis of these data show the paramagnetic to helical antiferromagnetic phase transitions are characterized by the critical exponents ν = 0.57 +- 0.05 and γ = 1.05 = +- .07 for Dy and ν = 0.57 +- .04 and γ = 1.14 = +- .10 for Ho. 3 refs., 2 figs., 1 tab

  18. Dy:Eu doped CaBAl glasses for white light applications

    Science.gov (United States)

    Lodi, T. A.; Sandrini, M.; Medina, A. N.; Barboza, M. J.; Pedrochi, F.; Steimacher, A.

    2018-02-01

    The combination of Eu3+ and Dy3+ in co-doped glassy materials provides interesting applicability for white light emission devices. In this work, Dy:Eu doped Calcium Boroaluminate (CaBAl) glasses were prepared by conventional melting quenching, with 3 wt% of Dy2O3 and Eu2O3 content varying from 0 to 3 wt%, and results of absorption spectra, photoluminescence and photoluminescence lifetime are discussed in terms of Eu2O3 content. The photoluminescence of the samples was studied under excitation of 365 and 405 nm light source. The 365 nm excitation shows favor to the Dy3+ ion emission. The results of photoluminescence lifetime at 575 nm (Dy3+) shows a decrease due to Eu2O3 addition, which suggests an energy transfer from Dy3+ (donor) to the Eu3+ (acceptor). On the other hand, under excitation of 405 nm, the photoluminescence lifetime at 575 nm (Dy3+) shows no significant changes due to Eu2O3 amount, which indicates that the energy transfer from Dy3+ to Eu3+ (under λexc = 405 nm) is negligible. However, the results of photoluminescence under 405 nm excitation present a white yellowish emission in the CIE diagram, which shifts to red with Eu2O3 addition. The combination of a Blue LED (BL) emission with the emission of the samples was also studied in the CIE diagram, in order to improve light emission and to obtain ideal White Light (WL). The results show that by modifying the emission intensity of BL, it is possible to achieve a route for smart lighting, close to the circadian light cycle.

  19. Physical study of CaSO4: Dy thermoluminescence (TL) material

    International Nuclear Information System (INIS)

    Nadira Kamarudin; Wan Saffiey Wan Abdullah; Megat Harun Al Rashid; Nurazila Mat Zali; Hafzaliza Erny Zainal Abidin; Taufik Dollah; Ishak Mansor; Nur Haslinda Ee Abdullah

    2010-01-01

    CaSO 4 : Dy have been prepared with the varies of dopant concentration of 0.1 mol % to 0.5 mol % by wet precipitation technique. The resulting CaSO 4 : Dy powder were characterized using Particle Size Analyzers (PSA) and founded the particle size of the powder are around 4-5 mm with the 91-95 % yield. The morphology of CaSO 4 and determination of dopant was characterized using SEM, TEM and EDX. (author)

  20. The crystal structure and elastic properties of pure and Dy doped urania

    International Nuclear Information System (INIS)

    Szpunar, B.; Szpunar, J.A.

    2009-01-01

    The structure of urania and urania doped with dysprosium are studied using ab initio calculations. The CASTEP ab initio quantum mechanical program, employing density functional theory and ultrasoft pseudopotentials, is used. The calculations agree well with available experimental data. Furthermore the calculations predict that Dy does not affect significantly the crystal structure and elastic properties of the host urania. This finding is important for Low Void Reactivity Fuel (LVRF) that is made from Dy doped urania to enhance safety of CANDU reactors. (author)

  1. [Validity and reliability of the spanish EQ-5D-Y proxy version].

    Science.gov (United States)

    Gusi, N; Perez-Sousa, M A; Gozalo-Delgado, M; Olivares, P R

    2014-10-01

    A proxy version of the EQ-5D-Y, a questionnaire to evaluate the Health Related Quality of Life (HRQoL) in children and adolescents, has recently been developed. There are currently no data on the validity and reliability of this tool. The objective of this study was to analyze the validity and reliability of the EQ-5D-Y proxy version. A core set of self-report tools, including the Spanish version of the EQ-5D-Y were administered to a group of Spanish children and adolescents drawn from the general population. A similar core set of internationally standardized proxy tools, including the EQ-5D-Y proxy version were administered to their parents. Test-retest reliability was determined, and correlations with other generic measurements of HRQoL were calculated. Additionally, known group validity was examined by comparing groups with a priori expected differences in HRQoL. The agreement between the self-report and proxy version responses was also calculated. A total of 477 children and adolescents and their parents participated in the study. One week later, 158 participants completed the EQ-5D-Y/EQ-5D-Y proxy to facilitate reliability analysis. Agreement between the test-retest scores was higher than 88% for EQ-5D-Y self-report, and proxy version. Correlations with other health measurements showed similar convergent validity to that observed in the international EQ-5D-Y. Agreement between the self-report and proxy versions ranged from 72.9% to 97.1%. The results provide preliminary evidence of the reliability and validity of the EQ-5D-Y proxy version. Copyright © 2013 Asociación Española de Pediatría. Published by Elsevier Espana. All rights reserved.

  2. Development of Thermoluminescence Dosimeter CaSO4:Dy as Personal and Environmental Dosimeters

    International Nuclear Information System (INIS)

    Hasnel Sofyan

    2009-01-01

    Development of personal and environmental dosimeters using material phosphors of CaSO 4 :Dy powder in form capillary glass and disc teflon thermoluminescence (TL) dosimeter have been done. TL dosimeter CaSO 4 :Dy powder used can record dose response less than 0.01 mGy. Fading of TL dosimeter capillary glass after 29 days is 25%. In 1 batch, making of CaSO 4 :Dy powder can obtain 2 groups of dosimeter capillaries with coefficient variance smaller than 10%. This discrepancy caused difference in powder making and reading of the TL dosimeter. TL dosimeter CaSO 4 :Dy teflon disc with dia. 5 mm and 0.8 mm thickness is homogeneous mixture between phosphor powder with dia. 80 to 150 mesh and teflon powder dia. 20 μm. The composition of CaSO 4 :Dy and teflon in TL dosimeter influence sensitivity of the dosimeter. It’ concluded that in order to obtain optimal sensitivity of TL dosimeter, the composition of CaSO 4 :Dy and teflon is 3 and 1 with pressured of disc in 700 MPa. (author).

  3. Dy{sup 3+} ions as optical probes for studying structure of boro-tellurite glasses

    Energy Technology Data Exchange (ETDEWEB)

    Tuyen, Vu Phi, E-mail: vptuyen@gust-edu.vast.vn [Duytan University, K7/25 Quang Trung, Da Nang (Viet Nam); Graduate University of Science and Technology – VAST, 18 Hoang Quoc Viet, Hanoi (Viet Nam); Sengthong, Bounyavong; Quang, Vu Xuan [Duytan University, K7/25 Quang Trung, Da Nang (Viet Nam); Van Do, Phan [Thuyloi University, 175 Tay Son, Dong Da, Hanoi (Viet Nam); Van Tuyen, Ho; Xuan Hung, Le [Duytan University, K7/25 Quang Trung, Da Nang (Viet Nam); Thanh, Nguyen Trong [Institute of Materials Science – VAST, 18 Hoang Quoc Viet, Hanoi (Viet Nam); Nogami, Masayuki [Duytan University, K7/25 Quang Trung, Da Nang (Viet Nam); Toyota Physical and Chemical research Institute (Japan); Hayakawa, Tomokatsu [Nagoya Institute of Technology, Gokisocho Showaku, 466-8555 Nagoya, Aichiken (Japan); Huy, Bui The, E-mail: buithehuy.nt@gmail.com [Duytan University, K7/25 Quang Trung, Da Nang (Viet Nam); Department of Chemistry, Changwon National University, Changwon 641-773 (Korea, Republic of)

    2016-10-15

    Dy{sup 3+}-doped glasses with various compositions (35+x)B{sub 2}O{sub 3}+ (45−x)TeO{sub 2}+9.5ZnO+10Na{sub 2}O+0.5Dy{sub 2}O{sub 3} (x=0; 10 and 20) were prepared by a melt–quenching technique. The Dy{sup 3+} ions are used as an optical probe, of which the Judd–Ofelt parameters, the phonon-side band, and the Raman spectra were quantitatively estimated to search the change of glass structure (the change of the ratio of [BO{sub 4}] to [BO{sub 3}] units, formation of the non-bridging oxygens (NBO{sup −}), the change of [TeO{sub 3}] to [TeO{sub 4}] units) as a function of the B{sub 2}O{sub 3} content. The Ω{sub 2} and Ω{sub 6} values of Dy{sup 3+}-doped boro-tellurite samples are larger than that of Dy{sup 3+}-doped borate or tellurite sample. The CIE chromaticity color coordinates were calculated for the luminescence spectra of Dy{sup 3+} ions of the glasses with the different compositions and they were all located in the vicinity of white light center of the color coordination diagram.

  4. Effect of Dy addition on mechanical and magnetic properties of Mn-rich Ni–Mn–Ga ferromagnetic shape memory alloys

    International Nuclear Information System (INIS)

    Gao, L.; Dong, G.F.; Gao, Z.Y.; Cai, W.

    2012-01-01

    Highlights: ► The Dy addition significantly improves the compressive properties of Ni–Mn–Ga alloy. ► The mechanism of the improved mechanical properties by adding Dy is discussed. ► Dy doping results in a change of the fracture type of Ni–Mn–Ga alloy. ► Curie temperature almost remained unchanged at low Dy content and then decreases. - Abstract: The effects of partial substitution of rare earth Dy for Ga on the mechanical and magnetic properties of Mn-rich Ni 50 Mn 29 Ga 21−x Dy x (0 ≤ x ≤ 5) ferromagnetic shape memory alloys were investigated in detail. The results show that an appropriate amount of Dy addition significantly improves the mechanical properties of Ni–Mn–Ga alloy. With an increase in Dy content, the compressive strength enhances rapidly at first and then becomes stable when the Dy content is more than 1 at.%. However, the compressive strain increases dramatically and reaches a maximum value with 1 at.% Dy addition. Further increase in Dy content makes the compressive strain of the alloys decrease gradually. The mechanism of the improved mechanical properties is also discussed. Moreover, Dy doping changes the fracture type from intergranular fracture of Ni–Mn–Ga alloy to transgranular cleavage fracture of Ni–Mn–Ga–Dy alloys. The Curie temperature remains almost unchanged at low Dy content and subsequently decreases.

  5. Role of hydrogen in Nd–Fe–B sintered magnets with DyH{sub x} addition

    Energy Technology Data Exchange (ETDEWEB)

    Liu, Pan [State Key Laboratory of Silicon Materials, Department of Materials Science and Engineering, Zhejiang University, Hangzhou 310027 (China); Ma, Tianyu, E-mail: maty@zju.edu.cn [Key Laboratory of Novel Materials for Information Technology of Zhejiang Province, Zhejiang University, Hangzhou 310027 (China); Wang, Xinhua, E-mail: xinhwang@zju.edu.cn [State Key Laboratory of Silicon Materials, Department of Materials Science and Engineering, Zhejiang University, Hangzhou 310027 (China); Zhang, Yujing [State Key Laboratory of Silicon Materials, Department of Materials Science and Engineering, Zhejiang University, Hangzhou 310027 (China); Yan, Mi [State Key Laboratory of Silicon Materials, Department of Materials Science and Engineering, Zhejiang University, Hangzhou 310027 (China); Key Laboratory of Novel Materials for Information Technology of Zhejiang Province, Zhejiang University, Hangzhou 310027 (China)

    2015-04-15

    Highlights: • DyH{sub 2} and DyH{sub 3} fine powder were prepared. • Effect of DyH{sub x} on the magnetic properties of Nd–Fe–B sintered magnets was studied. • The effect mechanism of Dy hydrides was discussed. • The magnetic properties are greatly improved by DyH{sub 2} and DyH{sub 3} addition. - Abstract: In order to improve the coercivity of Nd–Fe–B sintered magnets, DyH{sub 2} and DyH{sub 3} fine powders were prepared and used as additive for preparing Nd–Fe–B sintered magnets. The effects of DyH{sub x} powders addition on the microstructures and the magnetic properties of the magnets have been investigated. It was found that hydrogen will react with oxygen of NdO{sub x} rich intergranular phases to form Nd rich phases by dysprosium hydride addition. The Nd-rich grain boundary phases are more homogenous and continuous because the volume fraction of Nd-rich grain boundary phases increases with respect to the Nd oxide phases. After desorption, fine dysprosium powders become more active and wrap matrix phases well so that the diffusion of dysprosium to the surface layer of matrix phases is convenient, so dysprosium decreases in grain boundary phases and aggregates in surface layer of matrix phases. Then, intrinsic coercivity of NdFeB sintered magnets is improved from 14.96 kOe to 20.5 kOe and 20.31 kOe by 2.0 wt.% DyH{sub 3} and 2.0 wt.% DyH{sub 2} addition, respectively. This study has shown that DyH{sub x} addition can reduce the content of oxygen in grain boundary phases. This can be an effective method for massive production.

  6. Structure and magnetic properties of hot deformed Nd2Fe14B magnets doped with DyHx nanoparticles

    Science.gov (United States)

    Wang, C. G.; Yue, M.; Zhang, D. T.; Liu, W. Q.; Zhang, J. X.

    2016-04-01

    Commercial NdFeB powders mixed with DyHx nanoparticles are hot pressed and hot deformed into anisotropic magnets by Spark Plasma Sintering (SPS). The hot deformed magnet exhibits strong c-axis crystallographic texture. The coercivity of the magnet doped with 1.0 wt% DyHx is increased by 66.7%, compared with the magnet without DyHx, while the remanence decreases only by 3%. TEM observation shows that there exists a continuous (Nd,Dy)2Fe14B layer between Nd-rich phase and NdFeB main phase.

  7. Facile synthesis, structural characterization, and photoluminescence mechanism of Dy3+ doped YVO4 and Ca2+ co-doped YVO4:Dy3+ nano-lattices

    Science.gov (United States)

    Dhiren Meetei, Sanoujam; Deben Singh, Mutum; Dorendrajit Singh, Shougaijam

    2014-05-01

    Light plays a vital role in the evolution of life. From sunlight to candle-light and then to other form of lighting devices, human beings are utilizing light since time immemorial. Lighting devices such as conventional incandescent lamp and fluorescent lamp have been replaced by Light Emitting Diodes (LEDs) for the later is cheap, durable, etc. Now-a-days, phosphor converted LEDs have been burning issues in the fabrication of lighting devices. Especially, lanthanide ion(s) doped phosphors are of great interest for the same. However, doped phosphors have a limitation of luminescence quenching, i.e., instead of increasing luminescence on increasing dopant concentration, the luminescence decreases. Therefore, it must be rectified by one or other means so as to get maximum desirable intensity for uses in display or lighting devices. In the present work, YVO4:Dy3+ and YVO4:Dy3+/Ca2+ nano-lattices are synthesized by a facile technique. Structural characterizations such as x-ray diffraction, SEM, TEM, HRTEM, and Selected Area Electron Diffraction (SAED) of the samples are reported. Photoluminescence (PL) excitation and emission, enhanced mechanism, and lifetime are thoroughly discussed. PL intensity of the quenched YVO4:Dy3+ is made increased up to 432.63% by Ca2+ co-doping. Role of the Ca2+ on the luminescence enhanced mechanism of YVO4:Dy3+/Ca2+ is elucidated.

  8. ER Stress and Lipid Metabolism in Adipocytes

    Directory of Open Access Journals (Sweden)

    Beth S. Zha

    2012-01-01

    Full Text Available The role of endoplasmic reticulum (ER stress is a rapidly emerging field of interest in the pathogenesis of metabolic diseases. Recent studies have shown that chronic activation of ER stress is closely linked to dysregulation of lipid metabolism in several metabolically important cells including hepatocytes, macrophages, β-cells, and adipocytes. Adipocytes are one of the major cell types involved in the pathogenesis of the metabolic syndrome. Recent advances in dissecting the cellular and molecular mechanisms involved in the regulation of adipogenesis and lipid metabolism indicate that activation of ER stress plays a central role in regulating adipocyte function. In this paper, we discuss the current understanding of the potential role of ER stress in lipid metabolism in adipocytes. In addition, we touch upon the interaction of ER stress and autophagy as well as inflammation. Inhibition of ER stress has the potential of decreasing the pathology in adipose tissue that is seen with energy overbalance.

  9. Endoplasmic reticulum: ER stress regulates mitochondrial bioenergetics

    Science.gov (United States)

    Bravo, Roberto; Gutierrez, Tomás; Paredes, Felipe; Gatica, Damián; Rodriguez, Andrea E.; Pedrozo, Zully; Chiong, Mario; Parra, Valentina; Quest, Andrew F.G.; Rothermel, Beverly A.; Lavandero, Sergio

    2014-01-01

    Endoplasmic reticulum (ER) stress activates an adaptive unfolded protein response (UPR) that facilitates cellular repair, however, under prolonged ER stress, the UPR can ultimately trigger apoptosis thereby terminating damaged cells. The molecular mechanisms responsible for execution of the cell death program are relatively well characterized, but the metabolic events taking place during the adaptive phase of ER stress remain largely undefined. Here we discuss emerging evidence regarding the metabolic changes that occur during the onset of ER stress and how ER influences mitochondrial function through mechanisms involving calcium transfer, thereby facilitating cellular adaptation. Finally, we highlight how dysregulation of ER–mitochondrial calcium homeostasis during prolonged ER stress is emerging as a novel mechanism implicated in the onset of metabolic disorders. PMID:22064245

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

    International Nuclear Information System (INIS)

    Pedraza L, M.

    2006-01-01

    The importance of this original research lies in the fact that it has proven that the [ 166 Dy]Dy/ 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 166 Ho-DOTMP or 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 166 Dy/ 166 Ho; to evaluate the in vitro and in vivo stability of both 166 Dy-EDTMP and 166 Ho-EDTMP complexes when the daughter 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 [ 166 Dy]Dy/ 166 Ho-EDTMP in vivo generator system. 166 Dy was obtained by neutron irradiation of enriched 164 Dy 2 O 3 in a TRIGA Mark III reactor. Labeling was carried out in an aqueous phosphate medium at pH 8.0 by addition of 166 DyCl 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 166 Dy/ 166 Ho-EDTMP is unstable after dilution in saline but stable in human serum with no translocation of the daughter nucleus subsequent to β decay of 166 Dy, which could release free 166 Ho 3+ . Biodistribution in mice

  11. 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)

  12. Photoluminescent layered Y/Er silicates

    International Nuclear Information System (INIS)

    Kostova, Mariya H.; Ananias, Duarte; Carlos, Luis D.; Rocha, Joao

    2008-01-01

    The synthesis of new layered rare-earth silicates K 3 [Y 1-a Er a Si 3 O 8 (OH) 2 ] (AV-22 materials) has been reported. The photoluminescence properties of Y/Er-AV-22 and the material resulting from its thermal degradation, K 3 [Y 1-a Er a Si 3 O 9 ] (Y/Er-AV-23), have been studied and compared. Both materials have a similar chemical makeup and structures sharing analogous building blocks, hence providing a unique opportunity for rationalising the evolution of the photoluminescence properties of lanthanide silicates across dimensionality

  13. Er moral bare noget vi leger?

    DEFF Research Database (Denmark)

    Thomsen, Frej Klem

    2014-01-01

    Hvis man er skeptiker, så er moral nemlig altid kun et udtryk for psykologi og kultur, også når det handler om for eksempel misbrug af børn i Tønder-sagen eller terror-angreb i Madrid, London og Mumbai .......Hvis man er skeptiker, så er moral nemlig altid kun et udtryk for psykologi og kultur, også når det handler om for eksempel misbrug af børn i Tønder-sagen eller terror-angreb i Madrid, London og Mumbai ....

  14. Er virksomheder deres sociale ansvar voksent?

    DEFF Research Database (Denmark)

    Øhrgaard, Per

    2018-01-01

    Eftertanken. Virksomheder er i dag ramt af en CSR-bølge. Men hvis definitionen af, hvad et samfundsmæssigt ansvar er, glider over på virksomhedernes hænder, glider det væk fra alle os andre.......Eftertanken. Virksomheder er i dag ramt af en CSR-bølge. Men hvis definitionen af, hvad et samfundsmæssigt ansvar er, glider over på virksomhedernes hænder, glider det væk fra alle os andre....

  15. Der er ingen gode mennesker i Hundestad

    DEFF Research Database (Denmark)

    Nord, Johan Christian

    2015-01-01

    Lars von Trier sig selv, at han er kulturradikal. Men hans film fortæller en anden historie. I dem flænses alle illusioner - også kulturradikalismen. Netop derfor er han stor - meget større end ham de kaldte Store Klaus......Lars von Trier sig selv, at han er kulturradikal. Men hans film fortæller en anden historie. I dem flænses alle illusioner - også kulturradikalismen. Netop derfor er han stor - meget større end ham de kaldte Store Klaus...

  16. Hva er det med Irma?

    Directory of Open Access Journals (Sweden)

    Anne Beate Reinertsen

    2016-10-01

    Full Text Available Abstract: This article is about formative quality assessment in a posthuman or newmaterial perspective; embodied knowledges.  Theory and method are written together in immanence to envision complexity.  The aim and scope of the article is to follow the flow of events Irma produces opening up for affirmative poetical critique praxis. Quality is forwarded as an intensity and force in a moment only.  The moment is therefore the only structure of the text, as moving quality. The intention and inner logic of the text is therefore designed to work against fixed definitions and conceptualizations of what quality and quality assessment is.  This way I hope to show what posthuman and newmaterial approaches can contribute with to build cultures of innovation in which quality is assessed and produces again and again. They put differences to work and open up for creating moments of educational justice. Sammendrag: Artikkelen handler om kvalitetsvurdering i et nymaterielt perspektiv: Kroppslig kunnskap og viten. Teori og metode skrives sammen i immanent samtidighet for å gi et bilde på kompleksitet. Både hensikt og mål med artikkelen er å følge den flyten som Irma som hendelse eller event produserer, for å åpne opp potensialitet for en bekreftende eller affirmativ poetiserende kritikkpraksis og en ny forståelse av- og vurdering for kvalitet. Kvalitet skrives fram som en hendelse, intensitet eller kraft i et øyeblikk. Øyeblikket er derfor tekstens eneste og bærende struktur, som kvalitet i bevegelse. Tekstens indre logikk har slik til hensikt å motvirke forsøk på å skape definerte, faste eller bestemte oppfatninger av hva kvalitet er og hvordan kvalitet kan vurderes. På denne måten håper jeg å vise hva nymaterielle perspektiver kan gjøre for å bygge kulturer for innovasjon hvor kvalitet vurderes og produseres igjen og igjen. De setter forskjellighet i bevegelse og åpner opp for å skape rettferdige utdanningsøyeblikk.

  17. Structure and microwave absorption properties of (Pr,Dy)Ni{sub 4}Fe alloy

    Energy Technology Data Exchange (ETDEWEB)

    Xiong, Jilei, E-mail: jileixue@163.com [Chinalco Guangxi Nonferrous Jinyuan Rare Earth Co., LTD, Hezhou 542603 (China); Guangxi Key Laboratory of Information Materials & School of Materials and Engineering, Guilin University of Electronic Technology, Guilin 541004 (China); Pan, Shunkang, E-mail: skpan88@163.com [Guangxi Key Laboratory of Information Materials & School of Materials and Engineering, Guilin University of Electronic Technology, Guilin 541004 (China); Qiao, Ziqiang [Chinalco Guangxi Nonferrous Jinyuan Rare Earth Co., LTD, Hezhou 542603 (China); Guangxi Key Laboratory of Information Materials & School of Materials and Engineering, Guilin University of Electronic Technology, Guilin 541004 (China)

    2017-03-15

    The Dy{sub x}Pr{sub 1−x}Ni{sub 4}Fe (x=0.0, 0.1, 0.2, 0.3, 0.4) alloys were synthesized by arc-smelting and high energy ball milling method. The structure, morphology, particle size and electromagnetic parameters of the powder were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), laser diffraction-based particle size analyzer and vector network analyzer (VNA), respectively. The results reveal that the Dy{sub x}Pr{sub 1−x}Ni{sub 4}Fe compounds are crystallized in PrNi{sub 4}Fe structure. The minimum absorption peak frequency of Dy{sub x}Pr{sub 1−x}Ni{sub 4}Fe shifts towards higher frequency region upon the Fe content. The minimum reflection loss of the Dy{sub x}Pr{sub 1−x}Ni{sub 4}Fe alloys increases first and then decreases with increasing Dy substitution. The Dy{sub 0.3}Pr{sub 0.7}Ni{sub 4}Fe alloy possess the best absorbing properties: the minimum reflection loss is −31.65 dB at 15.28 GHz with the best matching thickness d =1.0 mm and the reflection loss with the thickness ranging of 1.0–4.0 mm could reach −10 dB. - Highlights: • The structure and morphology of Dy{sub x}Pr{sub 1−x}Ni{sub 4}Fe alloys were studied. • The microwave absorption properties of Dy{sub x}Pr{sub 1−x}Ni{sub 4}Fe alloys were carefully studied. • The minimum reflection loss of Dy{sub 0.3}Pr{sub 0.7}Ni{sub 4}Fe alloy reaches −31.65 dB at 15.28 GHz with d=1.0 mm.

  18. Half-Sandwich Complexes of Dy(III): A Janus-Motif with Facile Tunability of Magnetism.

    Science.gov (United States)

    Liu, Shan-Shan; Xu, Ling; Jiang, Shang-Da; Zhang, Yi-Quan; Meng, Yin-Shan; Wang, Zitao; Wang, Bing-Wu; Zhang, Wen-Xiong; Xi, Zhenfeng; Gao, Song

    2015-06-01

    Three half-sandwich organometallics [(Cp(R))Dy(DBM)2(THF)]·solvent [Cp(R) = Cp* (1Dy, Cp* = C5Me5), Cp(4PrPh) (2Dy, Cp(4PrPh) = C5Pr4Ph), Cp' (3Dy, Cp' = C5Me4TMS, solvent = THF), DBM(-) = dibenzoylmethanoate anion, THF = tetrahydrofuran, TMS = trimethylsilyl] with a Janus structural motif, where the ligands of DBM(-) and [Cp(R)](-) are widely used in Dy(III)/β-diketonate and Ln(III)/cyclopentadienyl systems, were synthesized, structurally and magnetically characterized, and theoretically investigated. Single-crystal structural analysis reveals that the three complexes crystallize in the same space group P21/c. All the molecules display slow magnetic relaxation in the absence of an applied magnetic field, and the magnetic hysteresis loops of 2Dy and 3Dy can be observed under a magnetic field sweep rate of 10 Oe/s, indicating all three complexes are single-ion magnets (SIMs). The modifications of the Cp-ring lead to the distinct increment of the energy barrier from 46 K (1Dy) to 76 K (2Dy) to 320 K (3Dy). Ab initio calculations show that the ground Kramers doublet is strongly axial with gz approaching the value of 20 expected for the pure MJ = ±15/2 state, and the magnetic anisotropy axes for three complexes share a similar orientation which is perpendicular to the molecular pseudosymmetric axis. Electrostatic analyses confirm the magnetic anisotropy orientations and reveal that proper charge distribution of the coordination sphere (including the first and second) around Dy(III) ion enhances the magnetic anisotropy. Further investigation of the relaxation mechanisms suggests the energy barrier should be carefully used to evaluate single-ion magnets if Raman process is dominant in the low temperature range.

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

    Science.gov (United States)

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

    2006-10-01

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

  20. The isolation and the separation of Sm, Gd, Dy by extraction

    International Nuclear Information System (INIS)

    Biyantoro, D.; Lahagu, F.; Basuki, K.T.; Handini, T.; Rosyidin

    1996-01-01

    The isolation of yttrium and separation of Sm, Gd, y with extraction has been investigated. The steps of the process include of this research were the production the concentrate of lanthanide, the dilution, the isolation of yttrium, and the separation of the Sm, Gd, Dy. The first step was the digestion of xenotime sand, the extraction, the dilution, the filtration, the precipitation, the baking production a lanthanide oxide. The step was the separation of yttrium, the stripping, and the calcination production of yttrium oxide. And the third process was the separation of Sm, Gd, Dy by extraction process using method liquid-liquid extraction with extractant of D 2 EHPA and a solvent of dodecane. From the result have been found concentration of yttrium oxide = 88,71 %. The optimum condition of the separation of Gd/Dy have been found : the concentration of HNO 3 = 0,5 M, time of extraction = 15 minutes, and the concentration of extractant = 30 % D 2 EHPA in dodecane. The results of this condition were the distribution coefficient of Gd = 2,226, the distribution coefficient of Dy = 3,762, and the separation factor of Gd/Dy = 0,592. (author)

  1. Luminescence studies of SrAl2O4:Dy3+ nanophosphors

    International Nuclear Information System (INIS)

    Sharma, Ravi

    2016-01-01

    Nanosized strontium aluminate phosphors activated by Dy 3+ were prepared by combustion as well as by solid state reaction method. Nanophosphor was prepared by these methods at reaction temperatures 600°C and 1200°C respectively. Powder X-ray diffraction (XRD), scanning electron microscope analysis was used to characterize the prepared product. Themonoclinic phase was observed in the XRD pattern. The particle size of the samples was calculated around 35 nm. The SEM images show irregular shape of the prepared nanophosphor. Two peaks were found in the Mechanoluminescence (ML) response curve plotted between time and ML intensity. The H 3 BO 3 added strontium aluminate phosphors activated with Dy show more bright ML peak as compared to the powders of SrAl 2 O 4 :Dy 3+ without H 3 BO 3 . It was found that the PL and ML intensity increases with increasing concentration of Dy. The intensity becomes maximum for 3% of Dy. The photoluminescence emission shows two intense fluorescence transitions peaks at 498 nm and 583 nm, 4 F 9/2 → 6 H 15/2 in the blue and 4 F 9/2 → 6 H 13/2 in the yellow-orange wavelength region. (author)

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

    Science.gov (United States)

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

    2017-10-01

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

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

    Science.gov (United States)

    Srisittipokakun, N.; Kaewkhao, J.

    2017-07-01

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

  4. 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.

  5. Ungdomslitteratur former(er) sig

    DEFF Research Database (Denmark)

    Henkel, Ayoe Qvist

    2016-01-01

    Igennem en 'mediesensitiv' analyse af romanen "Akavet" af Ronnie Andersen (2014) og perspektivering til andre aktuelle romaner for og med unge undersøger artiklen, hvordan ungdomslitteratur udvikler sig i dialog med digitale og mediebaserede impulser, og hvilke konsekvenser for udsigelserne om...... ungdomsliv og ungdomslitteraturens æstetik og mulige egenart, denne udvikling har. Artiklen baserer sig på en materialitetstilgang særligt inspireret af N. Katherine Hayles, som ikke tidligere har fået opmærksomhed i læsninger af ungdomslitteratur eller i diskussioner af ungdomslitteraturens mulige egenart......, at ungdomslitteratur drejer sig om unges udviklingsproces fra barndom og til voksenhed og dermed skildrer en overgang præget af linearitet, modning og vækst. Artiklen konkluderer, at der er ungdomslitteratur, der realiseres på andre præmisser, og Akavet kan ses som eksponent for en bevægelse fra ungdomslitteratur som...

  6. Vidensamfundet - det er sund fornuft

    DEFF Research Database (Denmark)

    Pedersen, Esther Oluffa

    2008-01-01

      Artiklen analyserer ophavet til det meget ombruste slogan 'fra tanke til faktura' i Danmarks Erhvervsråds rapport Vidensamfundet - en begrebsafklaring fra 2003 og i skyggerapporten udformet af CO-industri og Dansk Industri (DI) i notatet Fra forskning til faktura fra sommeren 2001. Med baggrund i...... disse rapporter og i regeringens efterfølgende udspil til en omstrukturering af de danske universiteter belyses, hvorledes strategiske udspil fra erhvervsinteressenter bliver konkret politik. Nærværende eksempel viser, hvordan CO-industris og DIs agenda på universitetsområdet meget direkte og i løbet af...... meget kort tid har opnået at blive udmøntet som dansk lov. Sigtet med artiklen er (1) at give en kritisk kommentar til den definition af viden, som ligger til grund for sloganet 'fra tanke til faktura'. Rapporterne analyseres for at belyse den ideologiske baggrund, der ligger bag de strategisk...

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

    NARCIS (Netherlands)

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

    2015-01-01

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

  8. Anisotropic magnetic properties of dysprosium iron garnet (DyIG)

    International Nuclear Information System (INIS)

    Lahoubi, M; Younsi, W; Soltani, M-L; Ouladdiaf, B

    2010-01-01

    The magnetic properties of dysprosium iron garnet (DyIG) have been studied by performing high resolution powder neutron diffraction experiments and high dc fields magnetizations on single crystals. Among all the reflections (hkl) indexed in the nuclear cubic space group (CSG) Ia 3-bar d with h+k+l=2n and k=[000], the superstructure lines (hkl)* forbidden by the symmetry (222)* and (622)* are not observed in the patterns at all temperatures. The pattern at 130 K is well interpreted within the magnetic modes F belonging to the irreducible representation (IR) T 1g of the CSG and identified to the room temperature ferrimagnetic Neel model. The high magnetic field behavior of the spontaneous collinear magnetic structure (MS) along the easy axis (EA) is isotropic. Below 130 K, the patterns exhibit additional magnetic superstructure lines. They are associated to the appearance of the spontaneous non collinear MS which is described in the subgroup of the CSG, R 3-bar c within the IR A 2g . A strong magnetization anisotropy (MA) is observed at 1.5 K in the low symmetry phases were the spin reorientation transition (SR) occur at T RS =14.5 K. The onset of MA is detected below two characteristic temperatures, Ta 1 =125 K and Ta 2 =75 K respectively to the hard axis (HA) and . Symmetry arguments are used in the framework of the theory of representation analysis (RA) applied to the subgroup of R 3-bar c, C2/c within the IR A g . It seems that this MA results essentially from the difference between the spontaneous non collinear MS and the field induced (FI) configurations. All results are discussed with previous neutrons studies.

  9. "Det man siger er man selv..."

    DEFF Research Database (Denmark)

    Næsby, Torben; Nørgaard, Britta; Uddholm, Mats

    forhold, der er hermeneutisk, strukturelt og relationelt bestemt. Praksisviden kan ikke være objektiv i gængs forstand, men det behøver ikke at diskvalificere denne viden. Forståelse er altid knyttet til den sag og bundet til den situation man står overfor og i som professionel og som menneske....

  10. Er der en underviser til stede?

    DEFF Research Database (Denmark)

    Christiansen, René Boyer; Nortvig, Anne-Mette; Rosenlund, Lea Tilde

    2015-01-01

    I de senere år er MOOC (Massive Open Online Courses) blevet en faktor på uddannelsesområdet. MOOC-forskning er et forholdsvist nyt felt, men har inden for de seneste 2-3 år udviklet sig med hastige skridt (Liyanagunawardena et al. 2013, Bayne & Ross 2014). En stor del af denne forskning har haft...

  11. Coronavirus infection, ER stress and Apoptosis

    Directory of Open Access Journals (Sweden)

    TO SING eFUNG

    2014-06-01

    Full Text Available The replication of coronavirus, a family of important animal and human pathogens, is closely associated with the cellular membrane compartments, especially the endoplasmic reticulum (ER. Coronavirus infection of cultured cells was previously shown to cause ER stress and induce the unfolded protein response (UPR, a process that aims to restore the ER homeostasis by global translation shutdown and increasing the ER folding capacity. However under prolonged ER stress, UPR can also induce apoptotic cell death. Accumulating evidence from recent studies has shown that induction of ER stress and UPR may constitute a major aspect of coronavirus-host interaction. Activation of the three branches of UPR modulates a wide variety of signaling pathways, such as mitogen-activated protein (MAP kinases activation, autophagy, apoptosis and innate immune response. ER stress and UPR activation may therefore contribute significantly to the viral replication and pathogenesis during coronavirus infection. In this review, we summarize current knowledge on coronavirus-induced ER stress and UPR activation, with emphasis on their cross-talking to apoptotic signaling.

  12. Er formen blevet vigtigst i politik?

    DEFF Research Database (Denmark)

    Etemadi, Maziar Haghpaidar

    2005-01-01

    RETORIK: Retorikken er kunsten at tage ordet - skriftligt eller mundtligt - og udtrykke sig smukt og velformuleret. Gorgias (ca. 490-ca. 390 f. Kr.) fra Leontinoi på Sicilien betragtes som ophavsmanden til den første endelige formulering af retorikkens virke og muligheder: "Talen er en mægtig...

  13. Multikulturalisme er en ny slags Apartheid

    DEFF Research Database (Denmark)

    Dyrberg, Torben Bech

    2016-01-01

    I en ny antologi retter forfatterne et kritisk lys mod forsvarerne af multikulturalisme. Og det er der god grund til, mener en af bogens redaktører. For den store gruppe, der hylder multikulturen, glemmer i al dens godhed, at de samtidig er med til at undergrave demokratiet og styrke uheldige mag...

  14. High-temperature oxidation and hot-corrosion behaviour of EB-PVD β-NiAlDy coatings

    International Nuclear Information System (INIS)

    Guo Hongbo; Li Dongqing; Peng Hui; Cui Yongjing; Gong Shengkai

    2011-01-01

    Research highlights: → Cr/Dy doped β-NiAl coatings were produced by electron beam physical vapor deposition. → The microstructures of the Cr/Dy doped β-NiAl coatings were characterized. → The effect mechanisms of Dy and Cr on the cyclic oxidation of the NiAl coatings were investigated. → Hot-corrosion behavior and associated failure mechanism of the NiAl coatings were investigated. - Abstract: Cr/Dy doped β-NiAl coatings were produced by electron beam physical vapour deposition (EB-PVD). Cyclic oxidation and hot-corrosion behaviour of the coatings was investigated. The addition of 0.1 at.% Dy to the β-NiAl coating significantly improved the cyclic oxidation resistance, while the addition of 1.3 at.% Cr to the NiAlDy accelerated the scale spallation. Spinels containing Mg, Na and Ca and pitting resulting from spallation of the spinels were observed on the NiAlDy coating after 200 h hot-corrosion at 950 o C. The NiAlDyCr coating effectively suppressed the formation of pitting and spinels.

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

    Science.gov (United States)

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

    2017-01-01

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

  16. Structural investigations and constitution along Fe14(Nd1-x(Tb or Dy)x)2B

    International Nuclear Information System (INIS)

    Grieb, B.; Schneider, G.; Henig, E.T.; Petzow, G.

    1989-01-01

    In the quarternary systems Fe-Nd-Tb-B and Fe-Nd-Dy-B the sections along Fe 14 (Nd 1-x Tb x ) 2 B and Fe 14 (Nd 1-x Dy x ) 2 B have been investigated by metallography, X-ray diffraction and differential thermal analysis (DTA). Nd was substituted in steps of 10 at.% until complete substitution by Tb or Dy. The variation of the lattice parameters a and c of the tetragonal unit cell of Fe 14 RE 2 B(Φ) from Fe 14 Nd 2 B to Fe 14 (Tb or Dy) 2 B as well as the increasing temperatures of formation measured, reveal unlimited solid solubility above 800 0 C. Between the peritectic formation Fe+L↔Φ on the Nd-rich side and the peritectic formation Fe 17 (Tb or Dy) 2 +L↔Φ on the Tb- or Dy-rich sides, a transition takes place around Fe 14 (Nd 0.8 (Tb or Dy) 0.2 ) 2 B. As in the ternary cases, stable and metastable formation of Φ must be differentiated for various superheating temperatures. The metastable phase formation in all the three ternary systems, Fe-Nd-B, Fe-Tb-B and Fe-Dy-B follows the same way: (Fe 17 RE 2 + B) solid solution and liquid form Φ. (orig.) [de

  17. Study of crystal-field excitations and Raman active phonons in o-DyMnO3

    International Nuclear Information System (INIS)

    Jandl, S.; Mansouri, S.; Mukhin, A.A.; Yu Ivanov, V.; Balbashov, A.; Gospodino, M.M.; Nekvasil, V.; Orlita, M.

    2011-01-01

    In DyMnO 3 orthorhombic single crystals, the weak Raman active phonon softening below T=100 K is correlated with the study of infrared active Dy 3+ CF excitations as a function of temperature and under applied magnetic field. We detect five H 13/2 CF transitions that we predict with appropriate CF Hamiltonian and we confirm that the magnetic easy axis lies in the ab plane. While the CF energy level shifts below T=100 K reflect different displacements of the oxygen ions that contribute to the phonon softening, lifting of the ground state Kramers doublet degeneracy (∼30 cm -1 ) is observed below T N =39 K due to the anisotropic Mn 3+ -Dy 3+ interaction, which could be responsible for the stability of the bc-cycloid ferroelectric phase. - Research highlights: → Origin of Raman active phonon softening in the multiferroic o-DyMnO 3 . → A crystal-field study under magnetic field of Dy 3+ in o-DyMnO 3 . → Location of the magnetic easy axis in o-DyMnO 3 . → Lifting of Kramers doublet degeneracy in o-DyMnO 3 .

  18. Magnetic hyperfine fields in Dy/sub 1-x/Y/sub x/Al2

    International Nuclear Information System (INIS)

    Hessel, A.; Kalvius, G.M.; Shenoy, G.K.; Zinn, W.; Wiedemann, W.

    1982-01-01

    161 Dy Moessbauer spectroscopy was carried out at 4.2 K on Dy/sub 1-x/Y/sub x/Al 2 for 0 less than or equal to x less than or equal to 0.6. For x=0 we find B=580 T and f/sub Q/=2810 MHz, close to free-ion values. For x > 0 both B and f/sub Q/ decrease weakly. We obtain (δB)/sub n/ = -14 T, (δf/sub Q/)/sub n/ = -110 MHz and (δB)/sub nn/ = + 1.6 T, (δf/sub Q/)/sub nn/ = +4 MHz per replaced nearest and next-nearest Dy 3 + neighbor, respectively

  19. 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.

  20. 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

  1. Electronic structure and luminescence properties of Ca2Ge7O16:Dy3+

    Directory of Open Access Journals (Sweden)

    Leonidov I.I.

    2017-01-01

    Full Text Available The present report represents an overview of the results of a combined experimental-computational study of electronic structure, thermoluminescence (TL and afterglow properties of Ca2Ge7O16:Dy3+ synthesized for the first time. Afterglow curves of Ca2Ge7O16:Dy3+ at 575 nm showing persistent luminescence have been described in Becquerel law. The TL measurements reveal at least one TL band at 326 K and two luminescence bands at 475 and 535 nm. Persistent luminescence in Ca2Ge7O16:Dy3+ originates from relatively shallow charge traps with high probability of charge carriers recapture. The model of energy processes, configurations of traps and luminescence centers has been proposed with the aid of ab initio calculations performed using the LCAO approximation and several hybrid functionals.

  2. 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%.

  3. Optical emission spectroscopy of metal-halide lamps: Radially resolved atomic state distribution functions of Dy and Hg

    Science.gov (United States)

    Nimalasuriya, T.; Flikweert, A. J.; Stoffels, W. W.; Haverlag, M.; van der Mullen, J. J. A. M.; Pupat, N. B. M.

    2006-03-01

    Absolute line intensity measurements are performed on a metal-halide lamp. Several transitions of atomic and ionic Dy and atomic Hg are measured at different radial positions from which we obtain absolute atomic and ionic Dy intensity profiles. From these profiles we construct the radially resolved atomic state distribution function (ASDF) of the atomic and ionic Dy and the atomic Hg. From these ASDFs several quantities are determined as functions of radial position, such as the (excitation) temperature, the ion ratio Hg+/Dy+, the electron density, the ground state, and the total density of Dy atoms and ions. Moreover, these ASDFs give us insight about the departure from equilibrium. The measurements show a hollow density profile for the atoms and the ionization of atoms in the center. In the outer parts of the lamp molecules dominate.

  4. Contribution to the study of the crystal field in rare earth alloys. Moessbauer effect on 161Dy

    International Nuclear Information System (INIS)

    Iraldi, Renato.

    1974-01-01

    Hyperfine interactions in Dy-Y and Dy-Sc alloys were studied using Moessbauer effect on 161 Dy. It was shown that all RE-RE and RE-Y alloys are equivalents systems as for the conduction electron structure and magnetic properties, when crystal fields and anisotropy effects are taken into account. On the other hand, quadrupolar interaction studies in Dy-Sc alloys showed that in these alloys electronic properties vary considerably with the concentration of Sc. These results are interpreted as being due to pressure effect that changes the properties of conduction electrons. A high charge density at the nucleus in Dy-Sc was observed. This phenomenon is also interpreted as being due to a pressure effect on dysprosium external shells [fr

  5. Statistical γ-ray multiplicity distributions in Dy and Yb nuclei

    International Nuclear Information System (INIS)

    Tveter, T.S.; Bergholt, L.; Guttormsen, M.; Rekstad, J.

    1994-03-01

    The statistical γ-ray multiplicity distributions following the reactions 163 Dy( 3 He,αxn) 162-x Dy and 173 Yb( 3 He,αxn) 172-x Yb have been studied. The mean value and standard deviation have been extracted as functions of excitation energy. The method is based on the probability distribution of k-fold events, where an α-particle is observed in coincidence with signals in k γ-ray detectors. Techniques for isolating statistical γ-rays and subtracting random background, cross-talk and neutron contributions are discussed. 22 refs., 10 figs., 3 tabs

  6. Measurements of lifetimes and feeding times for high spin states in 156Dy

    International Nuclear Information System (INIS)

    Ward, D.; Andrews, H.R.; Haeusser, O.; El Masri, Y.; Aleonard, M.M.; Yang-Lee, I.; Diamond, R.; Stephens, F.S.; Butler, P.A.

    1979-01-01

    The inverse reaction 24 Mg( 136 Xe, 4n) 156 Dy at 595 MeV has been used to populate high spin states in 156 Dy. A recoil distance technique was applied to measure lifetimes and feeding times in both the ground state band, and a band of anomalously high moment of intertia. Values for the intrinsic quadrupole moments, Q 0 , were derived to spin 22 + . The limit of centrifugal stretching appeared to be reached at spin 14 + . The results are discussed in terms of band mixing. (orig.)

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

    International Nuclear Information System (INIS)

    Ferro-Flores, G.; Monroy-Guzman, F.; Tendilla, J.I.; Garcia-Salinas, L.; Villarreal-Barajas, J.E.; Arteaga-Murphy, C.

    2002-01-01

    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 166 Dy/ 166 Ho-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 Dy 2 O 3 ( 164 Dy, 99 %, from Oak Ridge NL) in a Triga Mark III reactor at a flux in the central thimble of 3.10 13 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 166 Dy2Cl3 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. 166 Dy/ 166 Ho-DTPA-bisBiotin travelled with the solvent front R f 0.9-1.0 and the Dy +3 /Ho +3 species remained at the origin (R f = 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 166 Dy/ 166 Ho complex solution was determined by TLC. The complex 166 Dy/ 166

  8. Thermoluminescence of CaCO3:Dy and CaCO3:Mn

    International Nuclear Information System (INIS)

    Bapat, V.N.; Nambi, K.S.V.

    1976-01-01

    CaCO 3 samples doped with Dy and Mn were prepared in the laboratory by co-precipitation techniques. Thermoluminescence and emission spectra of these phosphors were studied and were compared with those of the naturally occuring calcite and undoped CaCO 3 samples. Dy-doping seems to give a more efficient phosphor and indicates a possibility of getting a better phosphor by a judicious choice of a rare earth doping of CaCO 3 . Interesting result have been obtained on the TL glow curve variations of these phosphors with different temperature treatments prior to irradiation. (author)

  9. Supervision og de tre k´er

    DEFF Research Database (Denmark)

    Schilling, Benedicte; Jacobsen, Claus Haugaard; Nielsen, Jan

    2010-01-01

    Kontrol, kontrakt og kontekst er supervisionens tre k'er. Men hvad er supervision i det hele taget for en størrelse, der spillerså central en rolle for den psykologfaglige profession?......Kontrol, kontrakt og kontekst er supervisionens tre k'er. Men hvad er supervision i det hele taget for en størrelse, der spillerså central en rolle for den psykologfaglige profession?...

  10. Evolution of the orbitals Dy-4f in the DyB2 compound using the LDA, PBE approximations, and the PBE0 hybrid functional

    Science.gov (United States)

    Rasero Causil, Diego; Ortega López, César; Espitia Rico, Miguel

    2018-04-01

    Computational calculations of total energy based on density functional theory were used to investigate the structural, electronic, and magnetic properties of the DyB2 compounds in the hexagonal structure. The calculations were carried out by means of the full-potential linearized augmented plane wave (FP-LAPW) method, employing the computational Wien2k package. The local density approximation (LDA) and the generalized gradient approximation (GGA) were used for the electron-electron interactions. Additionally, we used the functional hybrid PBE0 for a better description the electronic and magnetic properties, because the DyB2 compound is a strongly-correlated system. We found that the calculated lattice constant agrees well with the values reported theoretically and experimentally. The density of states (DOS) calculation shows that the compound exhibits a metallic behavior and has magnetic properties, with a total magnetic moment of 5.47 μ0/cell determined mainly by the 4f states of the rare earth elements. The functional PBE0 shows a strong localization of the Dy-4f orbitals.

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

    International Nuclear Information System (INIS)

    Aldama A, T.K.

    2003-01-01

    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 DyO 3 (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 166D yCl 3 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 DyCI 3 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

  12. Ytringsfriheden er ikke nødvendig

    DEFF Research Database (Denmark)

    Lauritzen, Pia

    2008-01-01

    nemlig godt konstatere, at ytringsfriheden ikke er nødvendig uden dermed at give afkald på frihed og demokrati.Vi kan oven i købet mene, at ytringsfriheden ophører med at være frihed, når vi betragter den som nødvendig. Og det er lige nøjagtig det, jeg efterlyser: at vi bruger filosoffer som Immanuel...... Kant og Luigi Pareyson til at forstå, at friheden er betydelig mere kompleks, end vi gør den til i øjeblikket....

  13. Branding er ikke til at komme udenom

    DEFF Research Database (Denmark)

    Hermansen, Judy

    2008-01-01

    Søren Askegaard definerer branding som "et iscenesat og afkodet symbolunivers". Det vil sige, at vi på den ene side har virksomhedens strategiske profilering, hvor den forsøger at skabe sig en særlig differentieret og positioneret profil, som adskiller den fra andre virksomheder. "Og det er denne...... strategiske kommunikation, der gør at branding er et ledelsesbegreb og ikke kun et markedsføringsbegreb. Det er ikke staffage, men værdier, som skal gennemsyre alle organisationens aktiviteter." Udgivelsesdato: maj...

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

    DEFF Research Database (Denmark)

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

    2014-01-01

    Luminescence glass is a potential candidate for the light-emitting diodes (LEDs) applications. Here, we study the structural and optical properties of the Eu-, Tb-, and Dy-doped oxyfluoride silicate glasses for LEDs by means of X-ray diffraction, photoluminescence spectra, Commission Internationale...

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

    Science.gov (United States)

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

    2017-03-01

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

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

    Indian Academy of Sciences (India)

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

  17. Combustion synthesis of Eu 2+ and Dy 3+ activated Sr 3 (VO 4 ) 2 ...

    Indian Academy of Sciences (India)

    2:Eu,Dy phosphors are presented in this paper. PL emission of Sr3(VO4)2:Eu phosphor shows green broad emission band centring at 511 nm and a red sharp band at 614 nm by excitation wavelength of 342 nm. The PL emission spectrum of ...

  18. Development of thin dosemeters of CaSO4: Dy for beta radiation detection

    International Nuclear Information System (INIS)

    Campos, L.L.

    1987-01-01

    Thin pellets of CaSO: Dy (0,20mm) were produced and tested in beta radiation fields. The Thermolumiscent (TL) characteristics studied were sensitivity, reproducibility, lower detection limit, linearity of TL response with absorved dose energy dependence. The results show the usefulness of this thin pellets in beta radiation detection. (Author) [pt

  19. Thermal, optical and structural properties of Dy3+ doped sodium aluminophosphate glasses

    Science.gov (United States)

    Kaur, Manpreet; Singh, Anupinder; Thakur, Vanita; Singh, Lakhwant

    2016-03-01

    Trivalent Dysprosium doped sodium aluminophosphate glasses with composition 50P2O5-10Al2O3-(20-x)Na2O-20CaO-xDy2O3 (x varying from 0 to 5 mol%) were prepared by melt quench technique. The density of the prepared samples was measured using Archimedes principle and various physical properties like molar volume, rare earth ion concentration, polaron radius, inter nuclear distance and field strength were calculated using different formulae. The differential scanning calorimetry (DSC) was carried out to study the thermal stability of prepared glasses. The UV Visible absorption spectra of the dysprosium doped glasses were found to be comprised of ten absorption bands which correspond to transitions from ground state 6H15/2 to various excited states. The indirect optical band gap energy of the samples was calculated by Tauc's plot and the optical energy was found to be attenuated with Dy3+ ions. The photoluminescence spectrum revealed that Dy3+ doped aluminophosphate glasses have strong emission bands in the visible region. A blue emission band centred at 486 nm, a bright yellow band centred at 575 nm and a weak red band centred at 668 nm were observed in the emission spectrum due to excitation at 352 nm wavelength. Both FTIR and Raman spectra assert slight structural changes induced in the host glass network with Dy3+ ions.

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

    Indian Academy of Sciences (India)

    a complete analysis, there is a need of a more elaborate microscopic nuclear theory. In view of this, we have planned to study the systematics of neutron rich even–even. 154−166. Dy isotopes, in a suitable ... action was fixed through the approximate relation G = (18 − 21)/A. The relative magnitudes of the parameters of the ...

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

    NARCIS (Netherlands)

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

    2005-01-01

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

  2. Theoretical Analysis of Experimental Data on Dy-160 That were Obtained in Studying Beta Decay

    Czech Academy of Sciences Publication Activity Database

    Usmanov, P. N.; Adam, Jindřich; Salikhbaev, U. S.; Solnyshkin, A. A.

    2010-01-01

    Roč. 73, č. 12 (2010), s. 1990-1996 ISSN 1063-7788 Institutional support: RVO:61389005 Keywords : Dy-160 * nucleus * experimental data Subject RIV: BG - Nuclear, Atomic and Molecular Physics, Colliders Impact factor: 0.563, year: 2010

  3. 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…

  4. Combustion synthesis of Eu and Dy activated Sr3(VO4)2 phosphor ...

    Indian Academy of Sciences (India)

    644 nm by the excitation wavelength of 426 nm in near visible blue region. The excitation wavelength of Eu (342 nm) and Dy (426 nm) activated Sr3(VO4)2 phosphor are well matched with the excitation of near UV excited solid state lighting and blue chip excitation of light emitting diodes, respectively. The effect of Eu2+ and ...

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

    Indian Academy of Sciences (India)

    - formed shape transitional region, as well as new theoretical constructs for the un- derstanding of these nuclei have led to renewed interest in the rare-earth region. The dysprosium (Dy) isotopes, which are members of the well-known prolate ...

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

    Indian Academy of Sciences (India)

    2017-06-19

    Jun 19, 2017 ... We present the optical properties of rare earth (RE)-doped A l 2 O 3 thin films and discuss their possible use in applications like gate dielectric material and in coating industry. Aluminum oxide films doped with RE elements such as Ce, Nd, Gd, and Dy are synthesized on glass substrate using ultrasonic ...

  7. Impedance spectroscopy of Ba3Sr2DyTi3V7O30 ceramic

    Indian Academy of Sciences (India)

    Administrator

    Complex impedance analysis showed non-Debye type of dielectric relaxation. The Nyquist plots showed the negative temperature coefficient of resistance character of Ba3Sr2DyTi3V7O30. A hopping mechanism of electrical transport processes in the system is evident from the modulus analysis. The activation energy of the ...

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

    Science.gov (United States)

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

    2018-01-01

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

  9. Project DyAdd: Visual Attention in Adult Dyslexia and ADHD

    Science.gov (United States)

    Laasonen, Marja; Salomaa, Jonna; Cousineau, Denis; Leppamaki, Sami; Tani, Pekka; Hokkanen, Laura; Dye, Matthew

    2012-01-01

    In this study of the project DyAdd, three aspects of visual attention were investigated in adults (18-55 years) with dyslexia (n = 35) or attention deficit/hyperactivity disorder (ADHD, n = 22), and in healthy controls (n = 35). Temporal characteristics of visual attention were assessed with Attentional Blink (AB), capacity of visual attention…

  10. 26 CFR 48.4082-2 - Diesel fuel and kerosene; notice required for dyed fuel.

    Science.gov (United States)

    2010-04-01

    ... 26 Internal Revenue 16 2010-04-01 2010-04-01 true Diesel fuel and kerosene; notice required for..., Tires, Tubes, Tread Rubber, and Taxable Fuel Taxable Fuel § 48.4082-2 Diesel fuel and kerosene; notice... “DYED KEROSENE, NONTAXABLE USE ONLY, PENALTY FOR TAXABLE USE” must be posted by a seller on any retail...

  11. The Effects of the Addition of Dy, Nb, and Ga on Microstructure and Magnetic Properties of Nd2Fe14B/α-Fe Nanocomposite Permanent Magnetic Alloys.

    Science.gov (United States)

    Ren, Kezhi; Tan, Xiaohua; Li, Heyun; Xu, Hui; Han, Ke

    2017-04-01

    We study the effects of Dy, Nb, and Ga additions on the microstructure and magnetic properties of Nd2Fe14B/α-Fe nanocomposites. Dy, Nb, and Ga additions inhibit the growth of the soft magnetic α-Fe phase. Dy and Nb additions are able to refine the microstructure, whereas Ga addition plays only a minor role in prohibiting crystal growth. The magnetic properties are sensitive to Dy, Nb, and Ga additions. The Dy-containing alloy enhances the intrinsic coercivity of 872 kA/m because Dy partially replaces Nd, forming (Nd, Dy)2Fe14B. Nb addition refines the microstructure, and consequently increases the exchange coupling between magnetic grains. The Nd9.5Fe75.4Co5Zr3B6.5Ga0.6 alloy exhibits the highest remanence (0.92 T) due to Ga addition.

  12. High energy electron beams characterization using CaSO4:Dy+PTFE Phosphors for clinical therapy applications

    International Nuclear Information System (INIS)

    Rivera, T.; Espinoza, A.; Von, S.M.; Alvarez, R.; Jiménez, Y.

    2012-01-01

    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 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 4 :Dy+PTFE were conducted under high electrons beams irradiations. The TL response of the pellets showed an intensity peak centered at around 215 °C. TL response of CaSO 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 4 :Dy+PTFE pellets for high electron beam dosimetry, provided fading is correctly accounted for. - Highlights: ► Developing of CaSO 4 :Dy to electron beams dosimetry. ► Characterization of caSO 4 :Dy to radiation safety in LINACs. ► TL characteristics of CaSO 4 :Dy for electron beams quality control.

  13. Effect of Dy on oxide scale adhesion of NiAl coatings at 1200 oC

    International Nuclear Information System (INIS)

    Guo Hongbo; Zhang Tian; Wang Shixing; Gong Shengkai

    2011-01-01

    Highlights: → β-NiAlDy coatings were produced by electron beam physical vapor deposition. → The cyclic oxidation behaviour of the β-NiAl coatings were evaluated at 1200 o C. → The microstructure of scale and chemistry of oxide/NiAl interface were studied. - Abstract: The cyclic oxidation behaviour of β-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 2 O 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.

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

    Science.gov (United States)

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

    2017-11-01

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

  15. Improvement and luminescent mechanism of Bi4Si3O12 scintillation crystals by Dy3+ doping

    Science.gov (United States)

    Yang, Bobo; Xu, Jiayue; Zhang, Yan; Zeng, Haibo; Tian, Tian; Chu, Yaoqing; Pan, Yubai; Cui, Qingzhi

    2016-01-01

    Bi4Si3O12:Dy (BSO:Dy) crystals have been grown by the modified vertical Bridgeman method and doping effects on light yield have been investigated. Doped with small amount of Dy2O3 (0.05-0.3 mol%), the light yield and energy resolution of BSO crystals were improved significantly. However, high concentrations of Dy2O3 doping resulted in the decrease of light yield. Pulse height measurement under γ-ray irradiation shows that 0.1 mol% Dy2O3 doping can make the relative light yield of BSO from 24.6% to 35.8% of BGO crystal, with fast decay time of 90 ns. X-ray excited radioluminescence spectra showed Dy doping has an extra emission in the host emission band (Bi3+ emission) and acts as a sensitizer to the Bi luminescent center. These results indicate that BSO:Dy crystal could be one of promising candidates for replacing BGO in some application such as electromagnetic calorimeter and dual readout in nuclear or high energy physics.

  16. ER Consolidated Quarterly Report October 2014

    Energy Technology Data Exchange (ETDEWEB)

    Cochran, John R. [Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)

    2014-10-01

    This Environmental Restoration Operations (ER) Consolidated Quarterly Report (ER Quarterly Report) provides the status of ongoing corrective actions and related Long- Term Stewardship (LTS) activities being implemented by Sandia National Laboratories, New Mexico (SNL/NM) ER for the April, May, and June 2014 quarterly reporting period. Section 2.0 provides the status of ER Operations activities including closure activities for the Mixed Waste Landfill (MWL), project management and site closure, and hydrogeologic characterizations. Section 3.0 provides the status of LTS activities that relate to the Chemical Waste Landfill (CWL) and the associated Corrective Action Management Unit (CAMU). Section 4.0 provides the references noted in Section I of this report.

  17. Bæredygtighed hos SMV'er

    DEFF Research Database (Denmark)

    2016-01-01

    Valg af materiale/medie/form: YouTube Valg af arbejdsform: Videoerne kan bruges som caseundervisning Begrundelse for valg af materiale/medie/form/arbejdsform: Caseundervisning er velegnet til at lære om praksis...

  18. Shear mode ER transfer function for robotic applications

    Energy Technology Data Exchange (ETDEWEB)

    Tan, K P; Stanway, R; Bullough, W A [Department of Mechanical Engineering, University of Sheffield, Sheffield (United Kingdom)

    2005-06-07

    Electro-rheological (ER) fluids are becoming popular in modern industrial applications. The advantage of employing ER devices is due to the ease of energizing the ER fluids at fast speeds of response. One innovation in ER applications could be in the positioning control of the robotic arm using an ER clutch. In order to actuate the manipulator, the ER output torque response is required. However, the behaviour of this ER torque response at different input conditions is not clearly understood. Therefore, in this paper, a sample study of the ER output torque is conducted. The ER output torque responses at different input parameters are studied carefully for the establishment of an appropriate ER transfer function in shear mode. This transfer function will serve as an important feature in future ER-actuated robot arm's control process.

  19. Er iPad digital udeskole?

    DEFF Research Database (Denmark)

    Schilhab, Theresa

    2014-01-01

    Hvor ’konkret’ skal en oplevelse være, for at intuitionen om, at det selvoplevede styrker læringen, holder? Er brug af tablets (e.g. iPads) et ligebyrdigt alternativ til den konkrete oplevelse?......Hvor ’konkret’ skal en oplevelse være, for at intuitionen om, at det selvoplevede styrker læringen, holder? Er brug af tablets (e.g. iPads) et ligebyrdigt alternativ til den konkrete oplevelse?...

  20. Snip snap snude - dobbelthagerne er ude

    DEFF Research Database (Denmark)

    Larsen, Malene Charlotte; Kofoed, Jette

    2015-01-01

    Det handler om at være grim. Det står i skarp kontrast til det pæne og polerede på Instagram. Det er flygtigt, useriøst og ligegyldigt. Og så forsvinder det heldigvis igen, så man behøver kun at forholde sig til det i de få sekunder, det foregår. Snapchat vokser i popularitet og er nu det...

  1. Hvad litteraturen kan, er ofte det rigtige ..

    DEFF Research Database (Denmark)

    Bundsgaard, Jeppe; Kühn, Lisbet

    2010-01-01

    Læsning i dansk handler i første omgang om at blive god til at læse, men på mellemtrinnet er det ved at være tiden til også at bruge skønlitteraturen til det, den er god til, nemlig til at få indsigt i menneskelivets kompleksitet. I dette kapitel anbefales det at gøre noget med litteraturen, fx f...

  2. Hvilke Dødehavstekster er "sekteriske"?

    DEFF Research Database (Denmark)

    Holst, Søren

    2003-01-01

    Skønt Dødehavsrullerne antageligt tilhørte en gruppering, der boede i Qumran, tyder alt på, at mange af teksterne er forfattet andre steder. Artiklen undersøger den særlige sprogbrug, som antageligt er typisk for Qumran-samfundet, og som præger forbavsende få af tekserne. En meget stor del af tek...

  3. Arctigenin alleviates ER stress via activating AMPK

    Science.gov (United States)

    Gu, Yuan; Sun, Xiao-xiao; Ye, Ji-ming; He, Li; Yan, Shou-sheng; Zhang, Hao-hao; Hu, Li-hong; Yuan, Jun-ying; Yu, Qiang

    2012-01-01

    Aim: To investigate the protective effects of arctigenin (ATG), a phenylpropanoid dibenzylbutyrolactone lignan from Arctium lappa L (Compositae), against ER stress in vitro and the underlying mechanisms. Methods: A cell-based screening assay for ER stress regulators was established. Cell viability was measured using MTT assay. PCR and Western blotting were used to analyze gene and protein expression. Silencing of the CaMKKβ, LKB1, and AMPKα1 genes was achieved by RNA interference (RNAi). An ATP bioluminescent assay kit was employed to measure the intracellular ATP levels. Results: ATG (2.5, 5 and 10 μmol/L) inhibited cell death and unfolded protein response (UPR) in a concentration-dependent manner in cells treated with the ER stress inducer brefeldin A (100 nmol/L). ATG (1, 5 and 10 μmol/L) significantly attenuated protein synthesis in cells through inhibiting mTOR-p70S6K signaling and eEF2 activity, which were partially reversed by silencing AMPKα1 with RNAi. ATG (1-50 μmol/L) reduced intracellular ATP level and activated AMPK through inhibiting complex I-mediated respiration. Pretreatment of cells with the AMPK inhibitor compound C (25 μmol/L) rescued the inhibitory effects of ATG on ER stress. Furthermore, ATG (2.5 and 5 μmol/L) efficiently activated AMPK and reduced the ER stress and cell death induced by palmitate (2 mmol/L) in INS-1 β cells. Conclusion: ATG is an effective ER stress alleviator, which protects cells against ER stress through activating AMPK, thus attenuating protein translation and reducing ER load. PMID:22705729

  4. Trump er godt nyt for verdensfreden

    DEFF Research Database (Denmark)

    Jakobsen, Peter Viggo

    2017-01-01

    Trumps uberegnelighed øger ikke risikoen for krig. Den mindsker den ved at få de allierede til at gøre mere og modstanderne til at forhandle. Det er godt for verdensfreden......Trumps uberegnelighed øger ikke risikoen for krig. Den mindsker den ved at få de allierede til at gøre mere og modstanderne til at forhandle. Det er godt for verdensfreden...

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

    International Nuclear Information System (INIS)

    Jimenez V, M.R.

    2003-01-01

    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 Dy 2 0 3 in the TRIGA Mark III reactor. The labelled was carried out in aqueous solution to p H 8.0 for addition of 166 Dy Cl 3 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 Ho 3+ 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)

  6. Characterization of the ER-Targeted Low Affinity Ca2+ Probe D4ER

    Directory of Open Access Journals (Sweden)

    Elisa Greotti

    2016-09-01

    Full Text Available Calcium ion (Ca2+ is a ubiquitous intracellular messenger and changes in its concentration impact on nearly every aspect of cell life. Endoplasmic reticulum (ER represents the major intracellular Ca2+ store and the free Ca2+ concentration ([Ca2+] within its lumen ([Ca2+]ER can reach levels higher than 1 mM. Several genetically-encoded ER-targeted Ca2+ sensors have been developed over the last years. However, most of them are non-ratiometric and, thus, their signal is difficult to calibrate in live cells and is affected by shifts in the focal plane and artifactual movements of the sample. On the other hand, existing ratiometric Ca2+ probes are plagued by different drawbacks, such as a double dissociation constant (Kd for Ca2+, low dynamic range, and an affinity for the cation that is too high for the levels of [Ca2+] in the ER lumen. Here, we report the characterization of a recently generated ER-targeted, Förster resonance energy transfer (FRET-based, Cameleon probe, named D4ER, characterized by suitable Ca2+ affinity and dynamic range for monitoring [Ca2+] variations within the ER. As an example, resting [Ca2+]ER have been evaluated in a known paradigm of altered ER Ca2+ homeostasis, i.e., in cells expressing a mutated form of the familial Alzheimer’s Disease-linked protein Presenilin 2 (PS2. The lower Ca2+ affinity of the D4ER probe, compared to that of the previously generated D1ER, allowed the detection of a conspicuous, more clear-cut, reduction in ER Ca2+ content in cells expressing mutated PS2, compared to controls.

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

    Energy Technology Data Exchange (ETDEWEB)

    Hu, Sheng-qing, E-mail: joy_hsq@126.com [State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083 (China); Peng, Kun, E-mail: kpeng@hnu.edu.cn [State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083 (China); College of Materials Science and Engineering, Hunan University, Changsha 410082 (China); Chen, Hong [State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083 (China)

    2017-03-15

    Sintered NdFeB magnets were coated with a layer of Dy metal using electron beam evaporation method and then annealed at various temperatures to investigate the temperature dependence of Dy diffusion process in NdFeB magnets. A Dy-rich phase was observed along the grain boundaries after the grain boundary diffusion process, the diffusion coefficients of various temperatures were obtained, the diffusion coefficients of Dy along the grain boundaries at 800 °C and 900 °C were determined to be 9.8×10{sup −8} cm{sup 2} s{sup −1} and 2.4×10{sup −7} cm{sup 2} s{sup −1}, respectively. The diffusion length depended on the annealing temperature and the maximum diffusion length of approximately 1.8 mm and 3.0 mm can be obtained after annealing at 800 °C and 900 °C for 8 h. Higher diffusion temperature results in the diffusion not only along the grain boundaries but also into grains and then decrease in magnetic properties. The optimum annealing conditions can be determined as 900 °C for 8 h. The coercivity was improved from 1040 kA/m to 1450 kA/m and its magnetization has no significant reduction after the grain boundary diffusion process at the optimum annealing conditions. - Highlights: • The optimum annealing conditions can be determined as 900 °C for 8 h. • The diffusion coefficient of Dy at 900 °Care determined to be 2.4×10{sup −7} cm{sup 2} s{sup −1}. • A maximum diffusion length of about 3 mm can be obtained.

  8. Production of 165 Dy for radiation synovectomy, in a low-power (slowpoke) nuclear reactor

    International Nuclear Information System (INIS)

    Bridges, C.; Duke, M.J.M.; McQuarrie, S.A.; Wiebe, L.I.

    1998-01-01

    Full text: Severe, debilitating pain accompanies inflammation of the synovial membrane in rheumatoid arthritis. Under certain conditions, radiation synovectomy is an effective alternative to surgery for relief of these symptoms. Radionuclides which decay by the emission of beta particles, or beta plus low yields of gamma/x-rays are indicated for this medical application. Of the radionuclides with appropriate decay emissions, half-life and physical/chemical properties, 165 Dy is a suitable candidate for production in a low-power reactor. Literature methods for production of this radiopharmaceutical usually involve irradiating solid Dy(OH) 3 , which is dissolved in HCl to form DyCl 3 and then re-precipitated under controlled conditions using NaOH, to produce the desired particle size for medical use. A procedure in which most or all of this post-irradiation processing can be eliminated is particularly important when using low neutron flux reactors, in order to avoid reductions in the amount of deliverable radiopharmaceutical. Radiological safety considerations may also necessitate avoiding post-irradiation processing, since low-power reactor facilities usually have no appropriate hot cells for extensive manipulation of highly active samples. Appropriately-sized, pre-formed Dy(OH) 3 particles were produced under a variety of conditions in attempts to produce a stable, sodium-free product that would be suitable for irradiation and use without further processing. Sodium content could be reduced to about 165 Dy production yields and particle characteristics will be presented in support of this concept

  9. DySb under high pressures: A full-potential study

    International Nuclear Information System (INIS)

    Gupta, Dinesh C.; Kulshrestha, Subhra

    2011-01-01

    Research highlights: → Present study is first of its kind as no theoretical study is reported on DySb except experimental information. → High pressures phase transition properties, magnetic-to-non-magnetic transition, elastic moduli and valence band width at ambient and high pressures, band structure, thermo-physical properties, magnetic moments, etc. have been computed by means of LSDA and LSDA + U approach. → LSDA + U approach is more accurate in predicting the proper nature of f-electrons of rare-earths. → The results are in good agreement with experimental data. - Abstract: The magnetic, structural, electronic and mechanical properties of DySb in the stable Fm3-barm and high-pressure Fm3-barm phase have been analyzed using full potential (linear) augmented plane wave method. The local spin-density approximation along with Hubbard-U corrections and spin-orbit coupling has been used for present calculations. The magnetic phase stability shows that DySb is ferromagnetically stable at ambient and high pressures. Under compression, it undergoes first-order structural transition from B1 to B2 phase at 22.2 GPa which shows good agreement with the experimental value of ∼22 GPa. The elastic properties of DySb have also been computed at normal and high pressures. The structural properties viz, equilibrium lattice constant, bulk modulus and its pressure derivative, transition pressure, volume collapse and elastic moduli are in good agreement with the experimental data. The calculation shows DySb to be semi-metallic.

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

    International Nuclear Information System (INIS)

    Reza Dousti, M.; Raheleh Hosseinian, S.

    2014-01-01

    Dy 3+ -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 Dy 3+ 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 Dy 3+ 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: • Dy 3+ -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 Dy 3+ ions under 800 nm excitation. • Different mechanisms for enhancements and quenches of emission intensities are discussed

  11. Nanostructure of Er3+ doped silicates.

    Science.gov (United States)

    Yao, Nan; Hou, Kirk; Haines, Christopher D; Etessami, Nathan; Ranganathan, Varadh; Halpern, Susan B; Kear, Bernard H; Klein, Lisa C; Sigel, George H

    2005-06-01

    We demonstrate nanostructural evolution resulting in highly increased photoluminescence in silicates doped with Er3+ ions. High-resolution transmission electron microscopy (HRTEM) imaging, nano-energy dispersed X-ray (NEDX) spectroscopy, X-ray diffraction (XRD) and photoluminescence analysis confirm the local composition and structure changes of the Er3+ ions upon thermal annealing. We studied two types of amorphous nanopowder: the first is of the composition SiO2/18Al2O3/2Er2O3 (SAE), synthesized by combustion flame-chemical vapor condensation, and the second is with a composition of SiO2/8Y2O3/2Er2O3 (SYE), synthesized by sol-gel synthesis (composition in mol%). Electron diffraction and HRTEM imaging clearly show the formation of nanocrystallites with an average diameter of approximately 8 nm in SAE samples annealed at 1000 degrees C and SYE samples annealed at 1200 degrees C. The volume fraction of the nanocrystalline phase increased with each heat treatment, eventually leading to complete devitrification at 1400 degrees C. Further XRD and NEDX analysis indicates that the nanocrystalline phase has the pyrochlore structure with the formula Er(x)Al(2-x)Si2O7 or Er(x)Y(2-x)Si2O7 and a surrounding silica matrix.

  12. Det er nemt at undgå frygtsomme avlsdyr, og der er kun fordele ved det!

    DEFF Research Database (Denmark)

    Møller, Steen Henrik; Hansen, Steffen W

    2009-01-01

    Der er flere fordele ved at undgå frygtsomme mink i avlsarbejdet, og der er effektive og gennemprøvede redskaber til at finde dem - og indsatsen kan tilpasses behovet. Minkens temperament er vigtigt, fordi rolige og nysgerrige mink er bedre tilpassede, lettere at håndtere, skriger mindre, og de...... frygtsomme og aggressive og tilsvarende mere tillidsfulde end tidligere. I dette indlæg beskriver vi en hurtig og effektiv metode til bestemmelse af minks temperament, hvordan man kan bruge dette i valg af avlsdyr, og hvilke effekter man kan forvente. Udgivelsesdato: oktober 2009...

  13. Magnetostriction and anisotropy compensation composition of Dy0.9-xTbxPr0.1Fe1.85, Dy1-xTbx(Fe0.9Mn0.1)1.8 and Dy0.9-xTbxPr0.1(Fe0.9Mn0.1)1.8 alloys

    International Nuclear Information System (INIS)

    Wu, C.H.; Zhong, X.P.; Li, R.Q.; Li, J.Y.

    1996-01-01

    The structure, Curie temperatures and magnetostriction of the alloys Dy 0.9-x Tb x Pr 0.1 Fe 1.85 , Dy 1-x Tb x (Fe 0.9 Mn 0.1 ) 1.8 and Dy 0.9-x Tb x Pr 0.1 (Fe 0.9 Mn 0.1 ) 1.8 have been investigated. These alloys are essentially single phase with cubic Laves structure. The lattice parameters and Curie temperatures increase steadily with increasing Tb content. The Tb dependence of the magnetostriction in various applied fields for polycrystalline Dy 0.9-x Tb x Pr 0.1 Fe 1.85 and Dy 0.9-x Tb x Pr 0.1 (Fe 0.9 Mn 0.1 ) 1.8 alloys exhibits peaks at x=0.25 and 0.3, respectively. From a comparison of Dy 1-x Tb x Fe 2 and Dy 1-x Tb x (Fe 0.9 Mn 0.1 ) 2 , it appears that the addition of Pr shifts the magnetocrystalline anisotropy compensation composition to lower Tb contents. (orig.)

  14. 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.

  15. Crosstalk of ER stress-mediated autophagy and ER-phagy: Involvement of UPR and the core autophagy machinery.

    Science.gov (United States)

    Song, Shuling; Tan, Jin; Miao, Yuyang; Zhang, Qiang

    2018-05-01

    Endoplasmic reticulum (ER) stress, a common cellular stress response, is closely related to the activation of autophagy that is an important and evolutionarily conserved mechanism for maintaining cellular homeostasis. Autophagy induced by ER stress mainly includes the ER stress-mediated autophagy and ER-phagy. The ER stress-mediated autophagy is characterized by the generation of autophagosomes that include worn-out proteins, protein aggregates, and damaged organelles. While the autophagosomes of ER-phagy selectively include ER membranes, and the double membranes also derive, at least in part, from the ER. The signaling pathways of IRE1α, PERK, ATF6, and Ca 2+ are necessary for the activation of ER stress-mediated autophagy, while the receptor-mediated selective ER-phagy degrades the ER is Atg40/FAM134B. The ER stress-mediated autophagy and ER-phagy not only have differences, but also have connections. The activation of ER-phagy requires the core autophagy machinery, and the ER-phagy may be a branch of ER stress-mediated autophagy that selectively targets the ER. However, the determined factors that control the changeover switch between ER stress-mediated autophagy and ER-phagy are largely obscure, which may be associated with the type of cells and the extent of stimulation. This review summarized the crosstalk between ER stress-mediated autophagy and ER-phagy and their signaling networks. Additionally, we discussed the possible factors that influence the type of autophagy induced by ER stress. © 2017 Wiley Periodicals, Inc.

  16. 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.

  17. Local compositional environment of Er in ZnS:ErF3 thin film electroluminescent phosphors

    Science.gov (United States)

    Davidson, Mark R.; Stoupin, Stanislav; DeVito, David; Collingwood, Joanna F.; Segre, Carlo; Holloway, Paul H.

    2011-03-01

    ZnS:Er thin film electroluminescent phosphors have been shown to exhibit a marked maximum in the near infrared emission (NIR) after a 425 °C post-deposition anneal with a very narrow temperature window of ±25 °C for optimal NIR emission. Extended X-ray absorption fine structure (EXAFS) spectroscopy has been obtained from both the Zn and Er edges in order to examine the local structure of the host and dopant in this NIR phosphor material. Interestingly, the addition of only ˜0.5 mol. % of Er as ErF3 into the host is found to reduce the Zn-S bond length of one of the two nearest Zn-S shells by 0.6 Å relative to high-quality, atomic layer epitaxy (ALE) grown, pure ZnS. The coordination number of this shorter Zn-S bond increases after the optimal 425 °C anneal. Longer range fits indicate a highly disordered structure, overall, consistent with earlier TEM results. Erbium-L3 EXAFS data from the second and third shells show increasing crystallinity with increasing annealing temperature in the vicinity of the Er dopant. Data from the first shell cannot be fit with S atoms, but are fit equally well with either O or F. Comparison with earlier analyses indicates that the Er is most likely surrounded by F in the first shell. Based on these data and previous studies, we develop a model in which the Er dopant is present as an Er:Fx complex with associated S vacancies, which may include one sulfur atom remaining in the Er nearest shell. Upon annealing, there is a reduction in the F present and a rearrangement of the crystal structure in the vicinity of the Er atom. Optimum annealing conditions occur when optimal crystalline environment is achieved prior to the loss of too much F from the Er:Fx complex.

  18. Effect of exchange springs on the coercivity of DyFe{sub 2}-YFe{sub 2} superlattices

    Energy Technology Data Exchange (ETDEWEB)

    Beaujour, J.M.L.; Bowden, G.J.; Gordeev, S.; Groot, P.A.J. de E-mail: pajdeg@phys.soton.ac.uk; Rainford, B.D.; Sawicki, M.; Ward, R.C.C.; Wells, M.R

    2001-05-01

    The coercivity of MBE-grown Laves-phase DyFe{sub 2}-YFe{sub 2} thin-layered ({<=}50 A) superlattice samples, with a (1 1 0) growth direction, can be varied by adjusting the relative thickness of the YFe{sub 2} and DyFe{sub 2} layers. However, for sufficiently thick layers, the coercivity is found to be dependent on the thickness of the YFe{sub 2} layers, even when the ratio of DyFe{sub 2}/YFe{sub 2} is fixed. This feature is illustrated using the superlattice films [wDyFe{sub 2}/wYFe{sub 2}]x40, with w=75, 100 and 150 A. The underlying reason for the decrease in coercivity with increasing width w, is traced to the action of the magnetic exchange springs in the YFe{sub 2} layers.

  19. Magnetic properties of melt-spun Nd-rich NdFeB alloys with Dy and Ga substitutions

    International Nuclear Information System (INIS)

    Harland, C.L.; Davies, H.A.

    1998-01-01

    The results of a systematic investigation of the effects of Dy and Ga additions on the magnetic properties of a Nd-rich NdFeB alloy are presented and discussed. Particular attention is given to the effect of increasing Dy substitutions on the coercivity of the Nd 18 Fe 76 B 6 alloy. Substitution of 30% of the Nd by Dy resulted in a coercivity increase from 1590 to 3290 kA m -1 . However, contrary to previous suggestions, substitution of 1% of the Fe by Ga was found to have only a small influence on the magnetic properties of all the alloys in the compositional series (Nd 100-x Dy x ) 18 Fe 76 B 6 (x=0-30). (orig.)

  20. Large-scale micromagnetic simulation of Nd-Fe-B sintered magnets with Dy-rich shell structures

    Directory of Open Access Journals (Sweden)

    T. Oikawa

    2016-05-01

    Full Text Available Large-scale micromagnetic simulations have been performed using the energy minimization method on a model with structural features similar to those of Dy grain boundary diffusion (GBD-processed sintered magnets. Coercivity increases as a linear function of the anisotropy field of the Dy-rich shell, which is independent of Dy composition in the core as long as the shell thickness is greater than about 15 nm. This result shows that the Dy contained in the initial sintered magnets prior to the GBD process is not essential for enhancing coercivity. Magnetization reversal patterns indicate that coercivity is strongly influenced by domain wall pinning at the grain boundary. This observation is found to be consistent with the one-dimensional pinning theory.

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

    Directory of Open Access Journals (Sweden)

    Yurong Wu

    2008-01-01

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

  2. High-efficient, bicolor-emitting GdVO4:Dy3+ phosphor under near ultraviolet excitation

    International Nuclear Information System (INIS)

    Lu, Jinjin; Zhou, Jia; Jia, Huayu; Tian, Yue

    2015-01-01

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

  3. Determination of energy transfer parameters in Er3+-doped and Er3+, Pr3+-codoped ZBLAN glasses

    NARCIS (Netherlands)

    Marshall, Christopher; Golding, Paul S.; Jackson, Stuart D.; King, Terence A.; Pollnau, Markus

    A detailed characterization of energy level lifetimes and energy-transfer processes in Er3+-doped and Er3+, Pr3+-codoped ZBLAN bulk glasses is presented. Energy transfer upconversion parameters from the Er3+ 4I13/2 and 4I11/2 levels have been measured and are compared to energy transfer from Er3+ to

  4. Investigation on the magnetocaloric effect in DyNi{sub 2}, DyAl{sub 2} and Tb{sub 1-n}Gd{sub n}Al{sub 2} (n=0, 0.4, 0.6) compounds

    Energy Technology Data Exchange (ETDEWEB)

    Sousa, V.S.R. de [Instituto de Fisica Armando Dias Tavares, Universidade do Estado do Rio de Janeiro, Rua Sao Francisco Xavier 524, 20550-900 Rio de Janeiro (Brazil)], E-mail: vinidesousa@gmail.com; Plaza, E.J.R. [Instituto de Fisica Armando Dias Tavares, Universidade do Estado do Rio de Janeiro, Rua Sao Francisco Xavier 524, 20550-900 Rio de Janeiro (Brazil); Reis, M.S. [CICECO, Universidade de Aveiro, 3810-193 Aveiro (Portugal); Alho, B.P. [Instituto de Fisica Armando Dias Tavares, Universidade do Estado do Rio de Janeiro, Rua Sao Francisco Xavier 524, 20550-900 Rio de Janeiro (Brazil); Carvalho, A. Magnus G. [Divisao de Metrologia de Materiais, Inmetro, Duque de Caxias (Brazil); Gama, S. [Departamento de Ciencias Exatas e da Terra, Unifesp, Diadema (Brazil); Oliveira, N.A. de; Ranke, P.J. von [Instituto de Fisica Armando Dias Tavares, Universidade do Estado do Rio de Janeiro, Rua Sao Francisco Xavier 524, 20550-900 Rio de Janeiro (Brazil)

    2009-10-15

    The magnetocaloric effect (MCE) in the DyNi{sub 2}, DyAl{sub 2} and Tb{sub 1-n}Gd{sub n}Al{sub 2} (n=0, 0.4, 0.6) was theoretically investigated in this work. The DyNi{sub 2} and DyAl{sub 2} compounds are described considering a model Hamiltonian which includes the crystalline electrical field anisotropy. The anisotropic MCE was calculated changing the magnetic field direction from <1 1 1> to <0 0 1> in DyNi{sub 2} and from <1 0 0> to <0 1 1> in DyAl{sub 2}. The influence of the second- and first-order spin-reorientation phase transitions on the MCE that occurs in these systems is discussed. For the calculations of the MCE thermodynamic quantities in the Tb{sub 1-n}Gd{sub n}Al{sub 2} systems we take into account a two sites magnetic model, and good agreement with the available experimental data was obtained.

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

    Energy Technology Data Exchange (ETDEWEB)

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

    2000-07-01

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

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

    Science.gov (United States)

    Wilson, Helen; Carr, Chris; Hacke, Marei

    2012-05-22

    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. 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. 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.

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

    Science.gov (United States)

    2012-01-01

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

  8. Concentration dependence of luminescence efficiency of Dy3+ions in strontium zinc phosphate glasses mixed with Pb3O4.

    Science.gov (United States)

    Kumar, Valluri Ravi; Giridhar, G; Veeraiah, N

    2017-02-01

    In this work we synthesized SrO-ZnO-P 2 O 5 glasses mixed with Pb 3 O 4 (heavy metal oxide) and doped with different amounts of Dy 2 O 3 (0.1 to 1.0 mol%). Subsequently their emission and decay characteristics were investigated as a function of Dy 2 O 3 concentration. The emission spectra exhibited three principal emission bands in the visible region corresponding to 4 F 9 /2  →  6 H 15 /2 (482 nm), 6 H 13 /2 (574 nm) and 6 H 11 /2 (663 nm) transitions. With increase in the concentration of Dy 2 O 3 (upto 0.8 mol%) a considerable increase in the intensity of these bands was observed and, for further increase, quenching of photoluminescence (PL) output was observed. Using emission spectra, various radiative parameters were evaluated and all these parameters were found to increase with increase in Dy 2 O 3 concentration. The Y/B integral emission intensity ratio of Dy 3 + ions evaluated from these spectra exhibited a decreasing trend with increase in the Dy 2 O 3 concentration up to 0.8 mol%. Quenching of luminescence observed in the case of the glasses doped with 1.0 mol% is attributed to clustering of Dy 3 + ions. The quantitative analysis of these results together with infra-red (IR) spectral studies indicated that 0.8 mol% is the optimum concentration of Dy 3 + ions needed to achieve maximum luminescence efficiency. Copyright © 2016 John Wiley & Sons, Ltd. Copyright © 2016 John Wiley & Sons, Ltd.

  9. Spin configurations and negative coercivity in epitaxially grown DyFe{sub 2}/YFe{sub 2} superlattices

    Energy Technology Data Exchange (ETDEWEB)

    Gordeev, S. N.; Beaujour, J.-M. L.; Bowden, G. J.; de Groot, P. A. J.; Rainford, B. D.; Ward, R. C. C.; Wells, M. R.

    2001-06-01

    Molecular beam epitaxial methods have been used to grow single crystal Laves phase DyFe{sub 2}/YFe{sub 2} superlattice samples with a (110) growth direction. In particular, the magnetic properties of the YFe{sub 2} dominated multilayer samples [wDyFe{sub 2}/4wYFe{sub 2}]{times}N with w=20, 30, 40, 45, 50, and 55 Aa are presented and discussed. In principle, the multilayer films should possess similar magnetic properties because they are all nominally Dy{sub 0.2}Y{sub 0.8}Fe{sub 2}. However, it is shown that their magnetic properties depend strongly on the thickness of the DyFe{sub 2} layers w. Those films with w{ge}45Aa possess negative coercivities, while those with w{le}40Aa are positive. It is argued that this behavior can be understood in terms of a strong increase of the intrinsic coercivity of the DyFe{sub 2}/YFe{sub 2} superlattice, taken as a whole, as w is reduced. For w{le}40Aa almost none of the DyFe{sub 2} moments can be flipped over in the available field range (12 T). {copyright} 2001 American Institute of Physics.

  10. Influence of Precursor Composition on the Microstructure and Superconducting Properties of Dy-Ba-Cu-O filaments

    International Nuclear Information System (INIS)

    Ikebe, Y; Ban, E; Matsuoka, Y; Nishijima, G; Watanabe, K

    2006-01-01

    Dy-Ba-Cu-O filaments have been successfully fabricated by a solution spinning method. The relationship between the partial melting temperature and the transport J c value at 77 K of the filamentary sample was systematically investigated. Two kinds of precursor filaments with starting composition of Dy:Ba:Cu = 1.18:2.12:3.09 (sample A)and Dy:Ba:Cu = 1.00:2.00:3.00 (sample B) were partially melted in 1%O 2 + Ar atmospheric gas and oxygenated in pure 100% O 2 gas. Samples partially melted at a wide temperature range of 990-1040 deg. C had J c values higher than 10 4 A/cm 2 . Both sample A and sample B partially melted at 1020 deg. C exhibited the maximum J c value higher than 4.2 x 10 4 A/cm 2 and 2.0 x 10 4 A/cm 2 , respectively. These samples had a dense microstructure consisting predominantly of Dy123 and finely dispersed Dy211 particles. The Dy211 particles with a diameter of about 1μm were finely dispersed in sample A, while the particles with a diameter of about 5μm were observed in sample B. The J c values of both samples were maintained about 2.0 x 10 3 A/cm 2 up to 14 T

  11. 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.

  12. 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.)

  13. Sport er hverken sundt eller social

    DEFF Research Database (Denmark)

    Andersen, Tem Frank

    2013-01-01

    Jeg deler ikke Lasch og Kayser Nielsens konklusioner, selvom jeg er meget enig i, at sport er dirty business. Min analyse peger i den retning, at sporten i sin organiserede form ikke er eller kan fungere som leverandør af nogen ”pakkeløsning”. Men sport kan sagtens bidrage med brudstykker til noget...... meningsfuldt, for det enkelte menneske, eller det enkelte lokalsamfund. Sporten kan ikke længere, hvis den skal fremstå som noget ideal, levere en hel pakke, en fuldstændig myte med tilhørende ritualer. Sport kan imidlertid som projekt fortsat godt levere stof til den meningsskabende fortælling om identitet...

  14. DNA as a component of ER materials

    International Nuclear Information System (INIS)

    Minagawa, K; Aoki, Y; Berber, M R; Mori, T; Tanaka, M

    2009-01-01

    Deoxyribonucleic acid (DNA), which is known as a typical biopolymer, has been utilized for a few types of ER materials. Suspensions were prepared with the particles of DNA, DNA/lipid complexes, and LDH (layered double hydroxide)/DNA composites. The purified DNA showed larger ER effect than the others, but this particle tended to absorb water, which caused less stability. Preliminary experiments of preparing composite with LDH indicated that this inorganic material would be useful for hydrophobic modification of DNA particles, although further optimization of composite preparation is needed. In addition, the LDH/DNA suspensions showed interesting behaviours under some conditions, which indicated possibility for controlling ER property in a wide range.

  15. Luminescence of YAB:Er single crystal

    Energy Technology Data Exchange (ETDEWEB)

    Foeldvari, I.; Beregi, E.; Watterich, A. [Research Institute for Solid State Physics and Optics, HAS, Konkoly-Thege u. 29-33, 1121 Budapest (Hungary); Solarz, P.; Dominiak-Dzik, G.; Ryba-Romanowski, W. [Institute of Low Temperature and Structure Research, PAS, Okolna 2, 50422 Wroclaw (Poland)

    2007-03-15

    Luminescence spectra of YAB:Er crystals were studied in the ultraviolet-visible region and in the 10-300 K temperature range. The dominant Er{sup 3+}-emission belonged to the {sup 4}S{sub 3/2} {yields} {sup 4}I{sub 15/2} transition (18000-18500 cm{sup -1}). Its Stark components were assigned and found to be consistent with those derived from the absorption spectra. The lifetime of the luminescence was determined as a function of temperature and Er-concentration, and the decay kinetics was analyzed. (copyright 2007 WILEY-VCH Verlag GmbH and Co. KGaA, Weinheim) (orig.)

  16. Neutron scattering study on R2PdSi3 (R=Ho,Er,Tm) compounds

    International Nuclear Information System (INIS)

    Tang, Fei

    2010-01-01

    Previous studies on the family of inter-metallic rare-earth compounds R 2 PdSi 3 revealed multifaceted magnetic properties, for instance, spin-glass like behavior. Experimental observations include: Signs of a crystallographic superstructure, complicated magnetic structures both in zero field and in applied magnetic fields as well as a generic phase in applied fields for compounds in the series with the heavy rare-earths R=Gd, Tb, Dy, Ho, Er and Tm. This thesis expands the studies on the magnetic properties of R 2 PdSi 3 employing mainly neutron scattering on single crystals with the focus on the compounds with R=Ho, Er and Tm. A detailed analysis of the crystallographic superstructure using modulation wave approach and group theory is presented. The resulting structure implies the existence of two different rare-earth sites with reduced symmetry and an arrangement of the different sites according to sequences as determined by the superstructure. It is shown that the reduced symmetry of the rare-earth sites is explicitly observed in the energy spectra of inelastic neutron scattering. The results on the magnetic structures and excitations are shown and discussed in the framework of the superstructure model. Specifically the generic phase in applied fields is interpreted as a direct consequence of the crystallographic superstructure. It is rather unusual that a crystallographic superstructure is playing such a decisive, and through the field dependence also tunable role in determining the magnetic properties as observed in R 2 PdSi 3 . The mediating interactions between the crystallographic part and the magnetic part of the system are discussed. (orig.)

  17. 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.

  18. Magnetocaloric properties and solid solution strengthening of Gd-C and Gd-Dy-C alloys

    International Nuclear Information System (INIS)

    Chen Yungui; Wu Jinping; Xiao Sufen; Zhang Tiebang; Tang Yongbai; Tu Mingjing

    2006-01-01

    In this paper, the near room temperature magnetic refrigerating solid solution alloys, Gd 1-x -C x (x ≤ 5 at.%) and Gd 0.98-x Dy x C 0.02 (x ≤ 20 at.%), were investigated together with a consideration of mechanical properties required by the container of the refrigerant material in a magnetic refrigerator. The results show that the micro-hardness of pure gadolinium metal can be much improved by adding carbon. The Curie temperature and adiabatic temperature changes of the Gd 1-x C x (x 0.98-x Dy x C 0.02 alloys can be tuned by adding dysprosium and their adiabatic temperature changes do not change much in a magnetic field change of 0-1 T

  19. A binuclear Fe(III)Dy(III) single molecule magnet. Quantum effects and models.

    Science.gov (United States)

    Ferbinteanu, Marilena; Kajiwara, Takashi; Choi, Kwang-Yong; Nojiri, Hiroyuki; Nakamoto, Akio; Kojima, Norimichi; Cimpoesu, Fanica; Fujimura, Yuichi; Takaishi, Shinya; Yamashita, Masahiro

    2006-07-19

    The binuclear [FeIII(bpca)(mu-bpca)Dy(NO3)4], having Single Molecule Magnet (SMM) properties, belonging to a series of isostructural FeIIILnIII complexes (Ln = Eu, Gd, Tb, Dy, Ho) and closely related FeIILnIII chain structures, was characterized in concise experimental and theoretical respects. The low temperature magnetization data showed hysteresis and tunneling. The anomalous temperature dependence of Mössbauer spectra is related to the onset of magnetic order, consistent with the magnetization relaxation time scale resulting from AC susceptibility measurements. The advanced ab initio calculations (CASSCF and spin-orbit) revealed the interplay of ligand field, spin-orbit, and exchange effects and probed the effective Ising nature of the lowest states, involved in the SMM and tunneling effects.

  20. 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.

  1. 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

  2. Concentration dependent spectroscopic properties of Dy3+ ions doped boro-phosphate glasses

    Science.gov (United States)

    Mariyappan, M.; Marimuthu, K.

    2016-05-01

    Dy3+ ions doped boro-phosphate glasses have been synthesized by melt quenching method and characterized through FTIR, absorption and luminescence spectral measurements. The presence of various stretching and bending vibrations of different borate and phosphate groups were identified from the FTIR spectra. In order to examine the electronic band structure of the studied glasses, Optical energy gap (Eopt) and Urbach energy (ΔE) values were estimated from the absorption spectra. The Judd-Ofelt (JO) intensity parameters were calculated to examine the symmetry of the ligand environment around the Dy3+ ions site. The emission spectra exhibit two intense emission bands at around 482 nm (blue) and 574 nm (yellow) corresponding to the 4F9/2→6H15/2 and 4F9/2→6H13/2 transitions respectively. The emission spectra were characterized through Commission International d'Eclairage (CIE) 1931 chromaticity diagram to explore its suitability for WLED applications.

  3. Physical and optical properties of sodium borate glasses doped with Dy3+ ions

    Science.gov (United States)

    Alajerami, Y. S. M.; Abushab, K. M.; Alagha, S. I.; Mhareb, M. H. A.; Saidu, A.; Kodeh, F. S.; Ramadan, Kh.

    2017-09-01

    The photoluminescence, optical and physical properties of sodium borate (NB) doped with different concentrations of Dy3+ were determined and well discussed. The samples were prepared by the melt-quenching technique and characterized by X-ray diffraction (XRD) and Fourier transform infrared (FTIR) spectroscopy. Photoluminescence and absorption spectra of NB glasses doped with different concentrations of Dy3+ are reported. Ten absorption bands with hypersensitive transition at 1272 nm (6F11/2 →6H 9/2) and two emission bands for the transitions at 4F 9/2 →6H 15/2 (blue color) and 4F 9/2 →6H 13/2 (yellow color) with an excitation of 330 nm have been recorded. A series of considerable physical properties (oscillator strengths, refractive index, ions concentration, polaron radius) was calculated for each dopant concentration.

  4. Neutron dosimetry by UV and IR spectrophotometry of the newly developed dyed ECE tracks

    International Nuclear Information System (INIS)

    Sohrabi, M.; Sadeghi Bajd, S.

    1990-01-01

    New, large and high-contrasted dyed ECE recoil tracks have been successfully developed. The chief reason for this development has been the provision of large photon-absorbing sites on a non-absorbing unaffected polymer surface for UV and IR spectrophotometry. In this approach, ECE recoil tracks in polycarbonate were dyed using our optimised conditions; sensitisation in 20% by weight acrylic acid at 75 0 C for 3.5 h and dyeing in 3% by weight eosin at 95 0 C for 4 h. Spectrophotometry by UV and IR, track counting and optical densitometry were applied to the samples. These preliminary studies showed some promise for UV absorbance measurements for routine large-scale applications. the results of which are presented and discussed. (author)

  5. Inter-band B(E2) transitions strengths in 160-170Dy nuclei

    International Nuclear Information System (INIS)

    Vargas, Carlos E; Lerma, Sergio; Velázquez, Víctor

    2015-01-01

    The rare earth region of the nuclear landscape is characterized by a large collectivity observed. The microscopic studies are difficult to perform in the region due to the enormous size of the valence spaces. The use of symmetries based models avoids that problem, because the symmetry allows to choose the most relevant degrees of freedom for the system under consideration. We present theoretical results for electromagnetic properties in 160-168 Dy isotopes employing the pseudo-SU(3) model. In particular, we study the B(E2) inter-band transition strengths between the ground state, γ and, β-bands. The model succesfully describes in a systematic way rotational features in these nuclei and allows to extrapolate toward the midshell nucleus 170 Dy

  6. On the phototransferred thermoluminescence in MgB4O7:Dy

    International Nuclear Information System (INIS)

    Richmond, R.G.

    1987-01-01

    On exposure to ionizing radiations, the normal traps in MgB 4 0 7 :Dy can be emptied by the readout process only or by annealing at suitable temperatures, leaving the deep traps still intact. Subsequently, it is possible to repopulate the dosimetric peak by illuminating with u.v. light. Charge carriers released from the traps during the second readout give rise to a thermoluminescent output proportional to the ionizing radiation exposure and the u.v. radiant energy. This is called phototransferred thermoluminescence (PTTL). The PTTL method can be utilized for the reassessment of the initial γ-ray exposure. This paper presents the measurements of the intrinsic response of the commercially available MgB 4 0 7 :Dy to u.v. radiation, with a demonstration of its use for γ-ray dose re-estimation using the PTTL technique. (author)

  7. Effect of anion interstitials on the thermoluminescent properties of CaSO4:Dy

    International Nuclear Information System (INIS)

    Lakshmanan, A.R.; Sivakumar, V.; Sangeetha Rani, R.; Kalpana, S.

    2013-01-01

    Efforts were made to synthesise CaSO 4 based thermoluminescent (TL) phosphors by solid state reaction route. ZnSO 4 flux was found to be quite efficient in the incorporation of Dy into CaSO 4 lattice as witnessed from the high TL intensity peak at about 100 °C following sintering at 750 °C in air. Its TL intensity is even higher than that of the 260 °C peak appearing in recrystallised CaSO 4 :Dy. Similar low temperature TL peak was found in recrystallised CaSO 4 :Dy samples sintered at 1000 °C in air. The results were explained on the basis of incorporation of interstitial oxygen anions which act as hole traps. Firing in sulphur or ammonium sulphate atmosphere did not shift the low temperature TL glow peak. But firing in carbon atmosphere at 750 °C with ZnSO 4 flux enhanced the intensity of TL glow peaks at 250 °C and at 400 °C due to the partial re-conversion of oxygen ions to sulphate ions. Firing at 850 °C in reduced atmosphere, however, quenched the intensity of all TL peaks due to the removal of oxygen i.e. partial reduction of CaSO 4 to CaS. The slow decline in the intensity of 250° TL peak on prolonged annealing at 400 °C in recrystallised CaSO 4 :Dy indicates the thermal migration of defects causing the TL peak. Redox mechanism involving such interstitial ions and anion vacancies in the presence or absence of cation vacancies could lead to the emission of high (∼250 °C) or low (∼100 °C) temperature TL peaks, respectively. Certain other co-dopants tried such as Al 3+ and SiO 4 4− simply quenched the TL efficiencies of CaSO 4 :Dy and CaSO 4 :Mn, respectively. Among the monovalent sulphates tried, Na 2 SO 4 :Dy gave a TL peak around 100 °C which is 20% of the 250 °C TL intensity of recrystallised CaSO 4 :Dy. -- Highlights: • Effect of anion co-dopants at interstitial sites on CaSO 4 :Dy is studied. • In this work ZnSO 4 was used as the oxygen source since it dissociates at 600 °C. • By introducing such defects one can tune charge

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

    Directory of Open Access Journals (Sweden)

    HUANG Feng-ping

    2017-07-01

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

  9. 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.

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

    Science.gov (United States)

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

    2017-10-01

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

  11. Influence of cellular ER alpha/ER beta ratio on the ER alpha-agonist induced proliferation of human T47D breast cancer cells

    NARCIS (Netherlands)

    Sotoca Covaleda, A.M.; Berg, van den H.; Vervoort, J.J.M.; Saag, van der P.; Strom, A.; Gustafsson, J.A.; Rietjens, I.M.C.M.; Murk, A.J.

    2008-01-01

    Breast cancer cells show overexpression of estrogen receptor (ER) relative to ERß compared to normal breast tissues. This observation has lead to the hypothesis that ERß may modulate the proliferative effect of ER. This study investigated how variable cellular expression ratios of the ER and ERß

  12. Er danskerne så lykkelige?

    DEFF Research Database (Denmark)

    Lolle, Henrik; Andersen, Jørgen Goul

    2013-01-01

    Forskning i lykke og livstilfredshed, eller subjective well-being, er i de seneste år nærmest eksploderet, og parallelt hermed har der været en stærkt stigende politisk interesse i begrebet, ikke mindst i nationale sammenligninger af lykke- og tilfredshedsniveau. Men kan vi nu også stole på disse......, herunder ikke mindst at tilfredshed virker som en magnet på danskere, samt at ordet ”lykkelig” er et stort ord, som man varer sig lidt imod at tage i sin mund set i forhold til det engelske ord ”happy”....

  13. New New Nordic Branding er det nye

    DEFF Research Database (Denmark)

    Andersen, Lars Pynt

    2017-01-01

    Konstruktionen af nordisk regionalisme er en stærk tendens som udgangspunkt for Nordic Branding, men har vi egentlig forstået de værdier og spændinger, der driver hele projektet om en ny ’nordiskhed’?......Konstruktionen af nordisk regionalisme er en stærk tendens som udgangspunkt for Nordic Branding, men har vi egentlig forstået de værdier og spændinger, der driver hele projektet om en ny ’nordiskhed’?...

  14. OL er en mirakelkur for verdens storbyer

    DEFF Research Database (Denmark)

    Østergaard, Katrine; Møller Christensen, Søren

    2006-01-01

    Der er kamp om at blive værtsby for de olympiske lege. Legene giver værtsbyen global opmærksomhed, kickstarter byudviklingen og giver efter al sandsynlighed økonomisk overskud. Men ikke alle byer slipper lige godt fra opgaven......Der er kamp om at blive værtsby for de olympiske lege. Legene giver værtsbyen global opmærksomhed, kickstarter byudviklingen og giver efter al sandsynlighed økonomisk overskud. Men ikke alle byer slipper lige godt fra opgaven...

  15. Geometric calibration of ERS satellite SAR images

    DEFF Research Database (Denmark)

    Mohr, Johan Jacob; Madsen, Søren Nørvang

    2001-01-01

    Geometric calibration of the European Remote Sensing (ERS) Satellite synthetic aperture radar (SAR) slant range images is important in relation to mapping areas without ground reference points and also in relation to automated processing. The relevant SAR system parameters are discussed and calib......Geometric calibration of the European Remote Sensing (ERS) Satellite synthetic aperture radar (SAR) slant range images is important in relation to mapping areas without ground reference points and also in relation to automated processing. The relevant SAR system parameters are discussed...

  16. Impedance spectroscopy of Ba3Sr2DyTi3V7O30 ceramic

    Indian Academy of Sciences (India)

    Administrator

    Bull. Mater. Sci., Vol. 33, No. 2, April 2010, pp. 129–134. © Indian Academy of Sciences. 129. Impedance spectroscopy of Ba3Sr2DyTi3V7O30 ceramic. P S SAHOO. †. , A PANIGRAHI. ††. , S K PATRI and R N P CHOUDHARY*. Department of Physics and Meteorology, Indian Institute of Technology, Kharagpur 721 302, ...

  17. Structural studies and c dependence in La 2- Dy Ca Ba 2 ...

    Indian Academy of Sciences (India)

    ... room temprerature on = 0.3 and 0.5 samples are reported. It is interesting to know that Ca substitutes for both La and Ba site with concomitant displacement of La onto Ba site. Superconductivity studies show that maximum c is obtained for = 0.5, = 1.0 sample (c ∼ 75 K), for La1.5Dy0.5Ca1Ba2Cu5O (La-2125).

  18. Absorption and emission analysis of RE3+(Sm3+ and Dy3+): lithium boro tellurite glasses.

    Science.gov (United States)

    Sooraj Hussain, N; Hungerford, G; El-Mallawany, R; Gomes, M J M; Lopes, M A; Ali, Nasar; Santos, J D; Buddhudu, S

    2009-06-01

    This paper reports on the development and spectral analysis of Sm3+ (1.0%) and Dy3+ (1.0%) doped lithium-boro-tellurite glasses. A bright orange (4G5/2-->6H7/2) along with a red (4G5/2-->6H9/2) and a yellow (4G5/2-->6H5/2) emission transition have been measured from Sm3+ doped lithium-boro-tellurite glass. Both blue (4F9/2-->6H15/2) and yellow (4F9/2-->6H13/2) emission bands have been obtained from Dy3+ glass. From the measured decay profiles, the lifetimes of the emissions of the Sm3+ glass (4G5/2-->6H5/2, 7/2, 9/2 and 11/2) at an excitation of 401 nm have been found to be in the range 0.47-0.81 ms, and with respect to the Dy3+ emissions (4F9/2-->6H15/2 and 13/2), with excitation at 450 nm, are measured to be in the range of 0.302-0.307 ms. Stimulated emission cross-sections (sigmapE) of the measured emission transitions have also been computed and the values are in the range of (0.38-1.20) x 10(-20) cm2 for Sm3+ and for Dy3+ doped lithium-boro-tellurite glass the values are (0.66-1.39) x 10(-20) cm2.

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

    Indian Academy of Sciences (India)

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

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

    Indian Academy of Sciences (India)

    We report the observation of a pronounced peak in surface resistance at microwave frequencies of 4.88 GHz and 9.55 GHz and its disappearance after irradiation with swift ions in laser ablated DyBa2Cu3O7- (DBCO) thin films. The measurements were carried out in zero field as well as in the presence of magnetic fields ...

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

    Indian Academy of Sciences (India)

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

  2. Crosslinked and Dyed Chitosan Fiber Presenting Enhanced Acid Resistance and Bioactivities

    OpenAIRE

    Xiao-Qiong Li; Ren-Cheng Tang

    2016-01-01

    The application of biodegradable chitosan fiber for healthy and hygienic textiles is limited due to its poor acid resistance in wet processing and poor antioxidant activity. In order to prepare chitosan fiber with good acid resistance and high antioxidant activity, chitosan fiber was first crosslinked by a water-soluble aziridine crosslinker, and then dyed with natural lac dye consisting of polyphenolic anthraquinone compounds. The main application conditions and crosslinking mechanism of the...

  3. Giant magnetoresistance and extraordinary magnetoresistance in inhomogeneous semiconducting DyNiBi

    OpenAIRE

    Casper, Frederick; Felser, Claudia

    2007-01-01

    The semiconducting half-Heulser compound DyNiBi shows a negative giant magnetoresistance (GMR) below 200 K. Except for a weak deviation, this magnetoresistance scales roughly with the square of the magnetization in the paramagnetic state, and is related to the metal-insulator transition. At low temperature, a positive magnetoresistance is found, which can be suppressed by high fields. The magnitude of the positive magnetoresistance changes slightly with the amount of impurity phase.

  4. Analysis of emission of Eu3+ and Dy3+ doped Magnesium Boro-Tellurite (MBT ceramics

    Directory of Open Access Journals (Sweden)

    Bohari Nur Zu Ira

    2015-03-01

    Full Text Available Rare earth (RE ions play an important role in the improvement of the optical properties of ceramics. Rare-earth ceramics are commonly used in display panels, fluorescent lamps and lasers. The luminescence properties of Magnesium Boro-Tellurite (MBT Eu3+ and Dy3+ doped ceramics have not been reported before. Therefore, the aim of this paper is to determine the effect of different compositions on the luminescence properties of the MBT material. A series of xTeO2-(70-xB2O3-30MgO ceramics with 10 ≤ x ≤ 40 mol % doped with 1 mol % of Eu3+ and Dy3+ ions was prepared via the solid-state reaction method. The influence of various compositions on the crystalline phase and photoluminescence properties of the samples were investigated by X-ray diffraction (XRD and luminescence spectroscopy. The crystalline phases obtained in this study are Mg3(BO32, MgB4O7, Mg2B2O5, Mg(Te2O5 and MgTe3O6. It was stated that the crystalline phases have not changed as a result of doping with Eu3+ and Dy3+ ions. The emission spectra of Eu3+: MBT ceramics showed strong red emission at 612 nm due to the transition of 5D0 → 7F2 and meanwhile, the Dy3+: MBT ceramics showed a blue emission at 480 nm due to 4F9/2 → 6H15/2 transition and yellow emission at 576 nm due to 4F9/2→6H13/2 transition. Both the rare-earth doped phosphors showed bright emission.

  5. Photo-TL in CaSO4:Dy: high exposure dosimetry

    International Nuclear Information System (INIS)

    Caldas, L.V.E.; Mayhugh, M.R.

    1974-01-01

    CaSO 4 :Dy exposed to 10 3 to 10 8 R then annealed in the range 280 to 400 0 C displays little TL in the major dosimetry peak near 200 0 C. Subsequent illumination with 250 nm light reinduces the 200 0 C TL. This radiation-enabled photo-TL is roughly proportional to the square root of the enabling exposure at least to 10 8 R. (auth)

  6. Solid state reaction synthesis and luminescence properties of Dy{sup 3+}-doped Gd{sub 2}Mo{sub 3}O{sub 9} phosphor

    Energy Technology Data Exchange (ETDEWEB)

    Zhang Lihui [Department of Physics, Dalian Maritime University, Dalian 116026 (China); Zhong Haiyang, E-mail: haae007@163.com [Department of Physics, Dalian Maritime University, Dalian 116026 (China); Li Xiangping; Cheng Lihong; Yao Li; Sun Jiashi; Zhang Jinsu [Department of Physics, Dalian Maritime University, Dalian 116026 (China); Hua Ruinian [College of Life Science, Dalian Nationalities University, Dalian 116600 (China); Chen Baojiu, E-mail: chenmbj@sohu.com [Department of Physics, Dalian Maritime University, Dalian 116026 (China)

    2012-01-01

    Gd{sub 2}Mo{sub 3}O{sub 9} phosphors with various Dy{sup 3+} concentrations were synthesized by a traditional solid-state reaction using Na{sub 2}CO{sub 3} as a flux. The influence of reaction temperature and Dy{sup 3+}-doping concentration on the crystal structure of the phosphors was examined by XRD (X-ray diffraction). The effect of Dy{sup 3+}-doping concentration on the emissions of Mo-O bond and Dy{sup 3+} was experimentally investigated. The energy transfers between host and Dy{sup 3+} ions, and between Dy{sup 3+} ions were analyzed based on both the Van Uitert and I-H models. The chromatic properties of the phosphors were also discussed.

  7. 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)

  8. [Translation and cultural adaptation to spanish of the questionnaire EQ-5D-Y Proxy version].

    Science.gov (United States)

    Olivares, P R; Perez-Sousa, M A; Gozalo-Delgado, M; Gusi, N

    2013-09-01

    The Health Related Quality of Life (HRQoL) questionnaire EQ-5D-Y for children and adolescents has been development and validated recently for its use in Spanish. However, the Spanish Proxy version of this tool has not yet been developed. The aim of this study was to translate and culturally adapt the international version of EQ-5D-Y Proxy into Spanish to measure the health related quality of life in the child and adolescent population. This study has been developed in the following phases: a) Transcultural adaptation of the international questionnaire by means of a direct translation to Spanish and back-translation to English, b) evaluation of the clarity, acceptability and familiarity of the first version of the questionnaire using probing and paraphrasing methods in 30 parents of children and adolescents distributed by sex and age. The Spanish EQ-5Y Proxy version was obtained. The interviewed participants indicated an excellent comprehensibility of the items and the perceived difficulty was less than 2 in all dimensions of the questionnaire, except in mobility where it was a slightly higher. The Spanish EQ-5D-Y Proxy version has shown to be well understandable and adapted to Spanish parents of children and adolescents. Its easy administration makes this questionnaire potentially useful in different fields. Copyright © 2012 Asociación Española de Pediatría. Published by Elsevier Espana. All rights reserved.

  9. Efficacy of Punica granatum L. hydroalcoholic extract on properties of dyed hair exposed to UVA radiation.

    Science.gov (United States)

    Dario, Michelli Ferrera; Pahl, Richard; de Castro, Jordana Rodrigues; de Lima, Fernando Soares; Kaneko, Telma Mary; Pinto, Claudinéia A S O; Baby, André Rolim; Velasco, Maria Valéria Robles

    2013-03-05

    The solar radiation promotes color fading of natural and dyed hair by free radical generation, which oxidize the pigments, and it has been proposed the incorporation of antioxidants in order to reduce the alterations of hair color. Due to its high content of polyphenols and tannins, which are potent antioxidants, the hydroalcoholic extract of Punica granatum L. (pomegranate) was used in this research. Hair care formulations containing pomegranate extract were applied to red dyed hair tresses, and these were exposed to UVA radiation. Non-ionic silicone emulsion presenting color protection properties were also used for comparison purpose between the results obtained with different treatments, including silicone in combination with the pomegranate extract. The pomegranate extract at 5.0% and 10.0%w/w was effective in preventing the hair color fading in 37.6% and 60.8%, respectively, but the association of hydroalcoholic extract and non-ionic silicone emulsion is not encouraged. Mechanical properties were not affected by UVA radiation, since significant differences in breaking strength were not observed. Considering the conditions which the tresses have been exposed, it was concluded that the pomegranate extract at 10.0% w/w in hair care formulations are effective in reducing color fading of red dyed hair. Copyright © 2013 Elsevier B.V. All rights reserved.

  10. Effect of Nb on magnetic and mechanical properties of TbDyFe alloys

    Science.gov (United States)

    Wang, Naijuan; Liu, Yuan; Zhang, Huawei; Chen, Xiang; Li, Yanxiang

    2018-03-01

    The intrinsic brittleness in giant magnetostrictive material TbDyFe alloy has devastating influence on the machinability and properties of the alloy, thus affecting its applications. The purpose of this paper is to study the mechanical properties of the TbDyFe alloy by alloying with Nb element. The samples (Tb0.3Dy0.7)xFe2xNby (y = 0, 0.01, 0.04, 0.07, 0.1; 3x + y = 1) were melted in an arc melting furnace under high purity argon atmosphere. The microstructure, magnetostrictive properties and mechanical performance of the alloys were studied systematically. The results showed that NbFe2 phases were observed in the alloys with the addition of Nb. Moreover, both the NbFe2 phases and rare earth (RE)-rich phases were increased with the increasing of Nb element. The mechanical properties results revealed that the fracture toughness of the alloy with the addition of Nb enhanced 1.5-5 times of the Nb-free alloy. Both the NbFe2 phase and the RE-rich phase had the ability to prevent crack propagation, so that they can strengthen the REFe2 body. However, NbFe2 phase is a paramagnetic phase, which can reduce the magnetostrictive properties of the alloy by excessive precipitation.

  11. Optical properties of Sr3B2O6:Dy3+/PMMA polymer nanocomposites

    Science.gov (United States)

    Khursheed, Sumara; Kumar, Vinay; Singh, Vivek K.; Sharma, Jitendra; Swart, H. C.

    2018-04-01

    The paper presents a facile way to synthesize luminescent polymer nanocomposite (PNC) films consisting of nanophosphors (NPs) of rare earth ions doped alkaline earth borates (Sr3B2O6:Dy3+) dispersed in a polymer (PMMA) matrix via a solution casting method and the results of their detailed structural and optical properties measurements. The PNC films were characterized using X-ray diffraction (XRD), Photoluminescence (PL), and differential scanning calorimetry (DSC). The crystallinity of the dispersed NPs did not suffer on account of being dispersed in the PMMA. The Rhombohedral structure and the formation of a single phase of Sr3B2O6:Dy3+ were confirmed by the XRD data of both the NP powders and the PNC films with an average particle size of 43 nm. Also, the observed PL emission and excitation spectra of the PNC films amply suggested that embedding of the nanophosphors in the PMMA matrix preserves their typical luminescence emission. The chromaticity coordinates (x = 0.37, y = 0.39) of the PNC films also validated the yellowish white emission of the nanophosphor. DSC scans on the PMMA only and the Sr3B2O6:Dy3+/PMMA films suggested an increase in the thermal stability of the PNC films as compared to pure PMMA although no significant change in the glass transition temperature was observed.

  12. Photoluminescence properties of white light emitting La2O3:Dy3+ nanocrystals

    Science.gov (United States)

    Reenabati Devi, Konsam; Dorendrajit Singh, Shougaijam; David Singh, Th.

    2018-01-01

    White light emitting nanocrystalline La2O3:Dy3+ phosphors with different concentration (0.5-2 at.%) were synthesized by simple precipitation method. X-ray diffraction (XRD) pattern indicates all the samples crystallizes in the hexagonal phase. Average crystallite sizes of the samples calculated from XRD data were found to be in the range of 20-55 nm. Transmission electron microscopy, selected area electron diffraction, energy dispersive analysis of X-ray and photoluminescence (PL) of the samples are also reported. Strong PL excitation peak due to charge transfer band was observed at 230 nm. Photoluminescence emission peaks observed at 486 and 575 nm were probably attributed to 4F9/2-6H15/2 and 4F9/2-6H13/2 of Dy3+ ions respectively. Optimum luminescence intensity is found at 1 at.% Dy3+ doped La2O3 sample. Further, Commission Internationale de l'é clairage (CIE, 1931) co-ordinates and correlated color temperature (CCT) of the doped sample were calculated to investigate the phosphors' performance and technical applicability of the emitted light respectively. CCT of the 0.5 and 1 at.% samples is 5894 K (white light), within the range of vertical daylight, which makes the synthesised samples promising nanophosphor and may find application in simulating vertical daylight of the Sun.

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

    Science.gov (United States)

    Tajuddin, H. A.; WanHassan, W. M. S.; Abdul Sani, S. F..; Shaharin, Nurul Syazlin

    2017-10-01

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

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

    Directory of Open Access Journals (Sweden)

    Tajuddin H. A.

    2017-01-01

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

  15. Microstructure, mechanical and corrosion properties of Mg-Dy-Gd-Zr alloys for medical applications.

    Science.gov (United States)

    Yang, L; Huang, Y; Feyerabend, F; Willumeit, R; Mendis, C; Kainer, K U; Hort, N

    2013-11-01

    In previous investigations, a Mg-10Dy (wt.%) alloy with a good combination of corrosion resistance and cytocompatibility showed great potential for use as a biodegradable implant material. However, the mechanical properties of Mg-10Dy alloy are not satisfactory. In order to allow the tailoring of mechanical properties required for various medical applications, four Mg-10(Dy+Gd)-0.2Zr (wt.%) alloys were investigated with respect to microstructure, mechanical and corrosion properties. With the increase in Gd content, the number of second-phase particles increased in the as-cast alloys, and the age-hardening response increased at 200°C. The yield strength increased, while the ductility reduced, especially for peak-aged alloys with the addition of Gd. Additionally, with increasing Gd content, the corrosion rate increased in the as-cast condition owing to the galvanic effect, but all the alloys had a similar corrosion rate (~0.5 mm year(-1)) in solution-treated and aged condition. Copyright © 2013 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

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

    Science.gov (United States)

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

    2017-09-01

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

  17. Evolution of spin correlations in SrDy2O4 in an applied magnetic field

    Science.gov (United States)

    Petrenko, O. A.; Young, O.; Brunt, D.; Balakrishnan, G.; Manuel, P.; Khalyavin, D. D.; Ritter, C.

    2017-03-01

    The development of short- and long-range magnetic order induced in a frustrated zigzag ladder compound SrDy2O4 by an applied field is studied using neutron-diffraction techniques. In zero field, SrDy2O4 lacks long-range magnetic order down to temperatures as low as 60 mK, and the observed powder-neutron-diffraction (PND) patterns are dominated by very broad diffuse scattering peaks. Single-crystal neutron diffraction reveals that the zero-field magnetic structure consists of a collection of antiferromagnetic chains running along the c axis and that there is very little correlation between the chains in the a b plane. In an applied magnetic field, the broad diffuse scattering features in PND are gradually replaced by much sharper peaks, however, the pattern remains rather complex, reflecting the highly anisotropic nature of SrDy2O4 . Single-crystal neutron diffraction shows that a moderate field applied along the b axis induces an up-up-down magnetic order associated with a 1/3 -magnetization plateau, in which magnetic correlation length in the a b plane is significantly increased, but it nevertheless remains finite. The resolution-limited k =0 peaks associated with a ferromagnetic arrangement appear in powder and single-crystal neutron-diffraction patterns in fields of 2.5 T and above.

  18. Synthesis of [Dy(DPA)(HDPA)] and its potential as gunshot residue marker

    International Nuclear Information System (INIS)

    Melo Lucena, Marcella A.; Rodrigues, Marcelo Oliveira; Gatto, Claudia C.; Talhavini, Marcio; Maldaner, Adriano O.; Alves, Severino; Weber, Ingrid T.

    2016-01-01

    The 2D metal-organic framework (MOF) [Dy(DPA)(HDPA)] (where H 2 DPA=dipicolinic acid) was synthesized under hydrothermal conditions and exhibited a whitish yellow color (CIE coordinates: 0.362, 0.416) when excited at 365 nm. This color arises from the simultaneous blue ( 4 F 9/2 – 6 H 15/2 ), yellow ( 4 F 9/2 – 6 H 13/2 ) and red ( 4 F 9/2 – 6 H 11/2 ) transitions of Dy 3+ . This MOF exhibited a high potential for use as a luminescent marker for gunshot residue (GSR) and in the ammunition encoding process because it was possible to observe visually the luminescent gunshot residue (LGSR) on the shooter’s hands, both on the firearm and at the firing range, using an UV lamp. These particles were easily collected and characterized by photoluminescence spectroscopy and SEM–EDS. The particles exhibited a typical morphology and a composition, making them easy to differentiate from particles of occupational or environmental origin. - Highlights: • First example of a luminescent GSR marker based on Dy 3+ luminescence. • New luminescent marker which can be used for ammunition encoding process. • Thermal and chemically stable MOF which can be used to visually identify GSR.

  19. Synthesis of [Dy(DPA)(HDPA)] and its potential as gunshot residue marker

    Energy Technology Data Exchange (ETDEWEB)

    Melo Lucena, Marcella A. [PGMTR - CCEN, Federal University of Pernambuco - UFPE, Avenida Professor Luiz Freire, S/N, Cidade Universitária, 50740-540 Recife (Brazil); Rodrigues, Marcelo Oliveira; Gatto, Claudia C. [LIMA, Chemistry Institute, University of Brasília-UNB, P.O. Box 04478, 70904-970 Brasília (Brazil); Talhavini, Marcio; Maldaner, Adriano O. [National Institute of Criminalistics, Brazilian Federal Police, SAIS Quadra 07, Lote 23, 70610-200 Brasília, DF (Brazil); Alves, Severino [Fundamental Chemistry Department-DQF, Federal University of Pernambuco - UFPE, Avenida Professor Luiz Freire, S/N, Cidade Universitária, 50740-540 Recife (Brazil); Weber, Ingrid T., E-mail: ingrid@ufpe.br [PGMTR - CCEN, Federal University of Pernambuco - UFPE, Avenida Professor Luiz Freire, S/N, Cidade Universitária, 50740-540 Recife (Brazil); LIMA, Chemistry Institute, University of Brasília-UNB, P.O. Box 04478, 70904-970 Brasília (Brazil)

    2016-02-15

    The 2D metal-organic framework (MOF) [Dy(DPA)(HDPA)] (where H{sub 2}DPA=dipicolinic acid) was synthesized under hydrothermal conditions and exhibited a whitish yellow color (CIE coordinates: 0.362, 0.416) when excited at 365 nm. This color arises from the simultaneous blue ({sup 4}F{sub 9/2}–{sup 6}H{sub 15/2}), yellow ({sup 4}F{sub 9/2}–{sup 6}H{sub 13/2}) and red ({sup 4}F{sub 9/2}–{sup 6}H{sub 11/2}) transitions of Dy{sup 3+}. This MOF exhibited a high potential for use as a luminescent marker for gunshot residue (GSR) and in the ammunition encoding process because it was possible to observe visually the luminescent gunshot residue (LGSR) on the shooter’s hands, both on the firearm and at the firing range, using an UV lamp. These particles were easily collected and characterized by photoluminescence spectroscopy and SEM–EDS. The particles exhibited a typical morphology and a composition, making them easy to differentiate from particles of occupational or environmental origin. - Highlights: • First example of a luminescent GSR marker based on Dy{sup 3+} luminescence. • New luminescent marker which can be used for ammunition encoding process. • Thermal and chemically stable MOF which can be used to visually identify GSR.

  20. Luminescence properties of Dy3+ doped lithium zinc borosilicate glasses for photonic applications

    Directory of Open Access Journals (Sweden)

    N. Jaidass

    2018-03-01

    Full Text Available Different concentrations of Dy3+ ions doped lithium zinc borosilicate glasses of chemical composition (30-x B2O3 - 25 SiO2 -10 Al2O3 -30 LiF - 5 ZnO - x Dy2O3 (x = 0, 0.1, 0.5, 1.0 and 2.0 mol% were prepared by the melt quenching technique. The prepared glasses were investigated through X-ray diffraction, optical absorption, photoluminescence and decay measurements. Intensities of absorption bands expressed in terms of oscillator strengths (f were used to determine the Judd-Ofelt (J-O intensity parameters Ωλ (λ = 2, 4 and 6. The evaluated J-O parameters were used to determine the radiative parameters such as transition probabilities (AR, total transition probability rate (AT, radiative lifetime (τR and branching ratios (βR for the excited 4F9/2 level of Dy3+ ions. The chromaticity coordinates determined from the emission spectra were found to be located in the white light region of CIE chromaticity diagram. Keywords: Condensed matter physics, Engineering, Materials science

  1. Complete Genome Sequence of Rothia mucilaginosa DY-18: A Clinical Isolate with Dense Meshwork-Like Structures from a Persistent Apical Periodontitis Lesion

    Science.gov (United States)

    2010-09-25

    chromosome. Regarding stress responsive systems known to affect biofilm formation in many bacteria , DY-18 genome possessed only two sigma factor genes...mucilaginosa strain DY-18 (DY-18), was isolated from the bacteria that were present in a persistent apical periodontitis lesion [8]. Apical periodontitis is a...collection isolated from a persistent apical periodontitis lesion, where the presence of bacteria was noted in root canals after numerous treatments [8

  2. Slow magnetic relaxation and single-molecule toroidal behaviour in a family of heptanuclear {Cr"I"I"ILn"I"I"I_6} (Ln=Tb, Ho, Er) complexes

    Energy Technology Data Exchange (ETDEWEB)

    Vignesh, Kuduva R. [IITB-Monash Research Academy, IIT Bombay, Powai, Mumbai (India); Langley, Stuart K. [School of Science and the Environment, Division of Chemistry, Manchester Metropolitan University, Manchester (United Kingdom); Swain, Abinash; Rajaraman, Gopalan [Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai (India); Moubaraki, Boujemaa; Murray, Keith S. [School of Chemistry, Monash University, Clayton, VIC (Australia); Damjanovic, Marko; Wernsdorfer, Wolfgang [Institute Neel, CNRS, Universite Grenoble Alpes, Grenoble (France); Institute of Nanotechnology (INT), Karlsruhe Institute of Technology (KIT), Eggenstein-Leopoldshafen (Germany)

    2018-01-15

    The synthesis, magnetic properties, and theoretical studies of three heterometallic {Cr"I"I"ILn"I"I"I_6} (Ln=Tb, Ho, Er) complexes, each containing a metal topology consisting of two Ln{sub 3} triangles connected via a Cr{sup III} linker, are reported. The {CrTb_6} and {CrEr_6} analogues display slow relaxation of magnetization in a 3000 Oe static magnetic field. Single-crystal measurements reveal opening up of the hysteresis loop for {CrTb_6} and {CrHo_6} molecules at low temperatures. Ab initio calculations predict toroidal magnetic moments in the two Ln{sub 3} triangles, which are found to couple, stabilizing a con-rotating ferrotoroidal ground state in Tb and Ho examples and extend the possibility of observing toroidal behaviour in non Dy{sup III} complexes for the first time. (copyright 2018 Wiley-VCH Verlag GmbH and Co. KGaA, Weinheim)

  3. Er computerspil andet end spild af tid?

    DEFF Research Database (Denmark)

    Andersen, Christian Ulrik

    2006-01-01

    Som andre fiktionsmedier gennem tiden kan også computerspillet reflektere og kommentere den virkelighed, og ikke mindst medie-virkelighed, det selv er en del af. Dette belyses gennem verdens første computerspil, Spacewar fra 1962. Udgivelsesdato: Februar...

  4. Creating Smart-er Cities: An Overview

    Science.gov (United States)

    Allwinkle, Sam; Cruickshank, Peter

    2011-01-01

    The following offers an overview of what it means for cities to be "smart." It draws the supporting definitions and critical insights into smart cities from a series of papers presented at the 2009 Trans-national Conference on Creating Smart(er) Cities. What the papers all have in common is their desire to overcome the all too often…

  5. Hvad er PET og fMRI?

    DEFF Research Database (Denmark)

    B. Paulson, Olaf; Balslev, Daniela; Gerlach, Christian

    2007-01-01

    Hvilken rolle spiller følelserne for vores tankeliv, og hvorfor har vi overhovedet følelser? I kraft af avancerede hjerneskanningsteknikker er den moderne hjernevidenskab blevet i stand til at besvare disse spørgsmål. Gennem artiklerne i denne antologi, skrevet af ledende danske forskere, bliver ...

  6. Hvad nu hvis sommerfuglen er ekshibitionist?

    DEFF Research Database (Denmark)

    Rösing, Lilian Munk

    2008-01-01

    Groft sagt vil denne artikel, ved at aflæse hvad hhv. Inger Christensen, Sigmund Freud og Jacques Lacan har at sige om sommerfugle, argumentere for at der er et afgørende skel mellem naturvidenskab og litteraturvidenskab; mellem naturen, dyret, sommerfuglen på den ene side og bevidstheden...

  7. Der er nye elever i klassen

    DEFF Research Database (Denmark)

    Weirsøe, Mathilde

    2010-01-01

    Etniske minoritetsbørn bliver udsat for 'naturlig' forskelsbehandling i de danske skoler, hvor der stadig undervises, som om alle elever hedder Jensen og Petersen. Det er på tide, at pædagogikken anerkender den etniske kompleksitet i vores samfund og indretter undervisningen derefter....

  8. Hvad er kildekritik?

    DEFF Research Database (Denmark)

    Olden-Jørgensen, Sebastian

    2009-01-01

    Hvad er Kildekritik? I stedet for at forstå kildekritik som et stringent system, grundlagt af Leopold von Ranke og i Danmark kanoniseret af Kristian Erslev, kunne man med større historiografisk ret og faglig frugtbarhed opfatte kildekritikken som en faglig tradition med tre lag afsat (sedimentere...

  9. Ledelse af samskabelse er en ny ledelsesdisciplin

    DEFF Research Database (Denmark)

    Ulrich, Jens; Martin Nielsen, Kim; Bartram, Jan

    2018-01-01

    Samskabelse er blevet det nye orienteringspunkt for rigtig mange offentlige organisationer. Det skyldes en udbredt konsensus om, at velfærdsopgaverne ikke kan løses inden for de vante organisatoriske rammer, men må løses i tæt kontakt med de parter, som opgaverne vedrører. Denne nye tilgang til...

  10. Hvad er hjemkundskabslæreren?

    DEFF Research Database (Denmark)

    Benn, Jette

    2009-01-01

        En appetizer: De praktisk-musiske fag på dagsordenen Temaet for denne artikel er hjemkundskabsfaget, -professionen og dens praktisering belyst gennem et interviewstudie fra 2008 af lærerstuderende og deres lærere. Dette studie relateres til forfatterens tidligere studie af fag og profession i...

  11. Finanskrisen - er den markedsorienterede regulering skurken?

    DEFF Research Database (Denmark)

    Grosen, Anders

    2009-01-01

    markedsorienterede opgørelse tilsyneladende skyld i bankernes dårlige resultater. I hvert fald er standardsætteren inden for international regnskabsregulering, IASB, i efteråret 2008 på rekordtid kommet de betrængte virksomheder - herunder bankerne - til undsætning med en regnskabsmæssig hjælpepakke som supplement...

  12. 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.

  13. 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

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

    Directory of Open Access Journals (Sweden)

    Durán, P.

    2002-12-01

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

  15. Effects of material growth technique and Mg doping on Er3+ photoluminescence in Er-implanted GaN

    International Nuclear Information System (INIS)

    Kim, S.; Henry, R. L.; Wickenden, A. E.; Koleske, D. D.; Rhee, S. J.; White, J. O.; Myoung, J. M.; Kim, K.; Li, X.; Coleman, J. J.

    2001-01-01

    Photoluminescence (PL) and photoluminescence excitation (PLE) spectroscopies have been carried out at 6 K on the ∼1540 nm 4 I 13/2 - 4 I 15/2 emissions of Er 3+ in Er-implanted and annealed GaN. These studies revealed the existence of multiple Er 3+ centers and associated PL spectra in Er-implanted GaN films grown by metalorganic chemical vapor deposition, hydride vapor phase epitaxy, and molecular beam epitaxy. The results demonstrate that the multiple Er 3+ PL centers and below-gap defect-related absorption bands by which they are selectively excited are universal features of Er-implanted GaN grown by different techniques. It is suggested that implantation-induced defects common to all the GaN samples are responsible for the Er site distortions that give rise to the distinctive, selectively excited Er 3+ PL spectra. The investigations of selectively excited Er 3+ PL and PLE spectra have also been extended to Er-implanted samples of Mg-doped GaN grown by various techniques. In each of these samples, the so-called violet-pumped Er 3+ PL band and its associated broad violet PLE band are significantly enhanced relative to the PL and PLE of the other selectively excited Er 3+ PL centers. More importantly, the violet-pumped Er 3+ PL spectrum dominates the above-gap excited Er 3+ PL spectrum of Er-implanted Mg-doped GaN, whereas it was unobservable under above-gap excitation in Er-implanted undoped GaN. These results confirm the hypothesis that appropriate codopants can increase the efficiency of trap-mediated above-gap excitation of Er 3+ emission in Er-implanted GaN. [copyright] 2001 American Institute of Physics

  16. 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.

  17. [Effect of charge compensation on emission spectrum of Sr2SiO4 : Dy3+ phosphor].

    Science.gov (United States)

    Li, Pan-Lai; Wang, Zhi-Jun; Yang, Zhi-Ping; Guo, Qing-Lin

    2009-01-01

    The Sr2SiO4 : Dy3+ phosphor was synthesized by the high temperature solid-state reaction method in air. Dy2O3 (99.9%), SiO2 (99.9%), SrCO3 (99.9%), Li2CO3 (99.9%), Na2CO3 (99.9%) and K2CO3 (99.9%) were used as starting materials, and the Dy3+ doping concentration was 2 mol%. The emission spectrum was measured by a SPEX1404 spectrophotometer, and all the characterization of the phosphors was conducted at room temperature. The emission spectrum of Sr2 SiO4 : Dy3+ phosphor showed several bands centered at 486, 575 and 665 nm under the 365 nm excitation. The effect of Li+, Na+ and K+ on the emission spectra of Sr2SiO4 : Dy3+ phosphor was studied. The results show that the location of the emission spectrum of Sr2SiO4 : Dy3+ phosphor was not influenced by Li+, Na+ and K+. However, the emission spectrum intensity was greatly influenced by Li+, Na+ and K+, and the evolvement trend was monotone with different charge compensation, i. e. the emission spectrum intensity of Sr2SiO4 : Dy3+ phosphor firstly increased with increasing Li+ concentration, then decreased. However the charge compensation concentration corresponding to the maximum emission intensity was different with different charge compensation, and the concentration is 4, 3 and 3 mol% corresponding to Li+, Na+ and K+, respectively. And the theoretical reason for the above results was analyzed.

  18. Sm(2-x)Dy(x)Zr2O7 pyrochlores: probing order-disorder dynamics and multifunctionality.

    Science.gov (United States)

    Sayed, Farheen N; Grover, V; Bhattacharyya, K; Jain, D; Arya, A; Pillai, C G S; Tyagi, A K

    2011-03-21

    The present work involves the synthesis of a series of Sm(2-x)Dy(x)Zr(2)O(7) compounds (0.0 ≤ x ≤ 2.0) by a controlled gel combustion process. The powders were thoroughly analyzed by powder X-ray diffraction (XRD), Raman spectroscopy, scanning electron microscopy, and diffuse-reflectance UV-visible spectroscopy. The powder XRD studies revealed the system to be single-phasic throughout with retention of pyrochlore-type ordering until 40 mol % of Dy(3+), beyond which the pyrochlore lattice gives way to the defect fluorite structure. Interestingly, Raman spectroscopic studies (as against XRD studies) showed retention of pyrochlore-type ordering throughout the homogeneity range of the compositions studied. This is perhaps the first study that reports retention of a weak pyrochlore-type superstructure in the Dy(2)Zr(2)O(7) system, which was otherwise known to crystallize in the defect fluorite system. The ionic conductivity measurements showed an increase in the activation energy (E(a)) with an increase in the mole percent of Dy(3+) owing to the decreased mobility with an increase in the degree of disorder. The system possesses a tunable band gap with varying amounts of Dy(3+). First-principles calculations were performed to support a decrease in the band gap of the doped system with an increase in the Dy(3+) content. The potential as photocatalysts of some of these compositions was explored, and they exhibited high photocatalytic activity for degradation of xylenol orange, with t(1/2) increasing from pure Sm(2)Zr(2)O(7) to pure Dy(2)Zr(2)O(7).

  19. MGS MARS/MOONS MAG/ER MAPPING ER ANGULAR FLUX V1.0

    Data.gov (United States)

    National Aeronautics and Space Administration — This data set consists of calibrated, time-ordered, angle-resolved electron flux data from the Electron Reflectometer (ER) instrument on the Mars Global Surveyor...

  20. 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)

  1. Hvornår er agil projektledelse rigtig?

    DEFF Research Database (Denmark)

    Pries-Heje, Jan

    2011-01-01

    Styrken ved agil projektledelse er hurtigheden og muligheden for at absorbere ændringer hurtigt gennem hele projektets løbetid, men der er naturligvis også nogle svagheder. Nogle af dem nævner jeg i artiklen, men derudover egner agil-formen sig ikke specielt godt til komplicerede projekter, hvor...... liv eller mange penge er på spil. Agil-formen er heller ikke velegnet til umotiverede medarbejdere, fordi de ikke har noget at bidrage med. For en projektleder synes jeg, at det er væsentligt at have et dybdegående kendskab til positive og negative sider ved både agil og plandreven projektledelse....... Verden er kompleks, og vores projekter derfor er tilsvarende komplekse. Som projektleder bør man således kunne analysere sig frem til den rigtige form for projektledelse, uanset om det er agil projektledelse eller ej....

  2. ER Consolidated Qtrly Rpt_April-June 2016_October 2016

    Energy Technology Data Exchange (ETDEWEB)

    Cochran, John R. [Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)

    2016-10-01

    This Environmental Restoration Operations (ER) Consolidated Quarterly Report (ER Quarterly Report) provides the status of ongoing corrective action activities being implemented by Sandia National Laboratories, New Mexico (SNL/NM) for the April, May, and June 2016 quarterly reporting period.

  3. TCSP ER-2 MICROWAVE TEMPERATURE PROFILER (MTP) V1

    Data.gov (United States)

    National Aeronautics and Space Administration — The TCSP ER-2 Microwave Temperature Profiler (MTP) dataset was collected by the ER-2 Microwave Temperature Profiler (MTP), which is a passive microwave radiometer...

  4. PODAAC-ERS2X-IMWF0

    Data.gov (United States)

    National Aeronautics and Space Administration — The European Remote Sensing Satellite generation 2 (ERS-2) Level 3 Mean Wind Fields dataset is derived from the ERS-2 scatterometer data and is produced and...

  5. GPM Ground Validation Navigation Data ER-2 OLYMPEX V1

    Data.gov (United States)

    National Aeronautics and Space Administration — The GPM Ground Validation NASA ER-2 Navigation Data OLYMPEX dataset supplies navigation data collected by the NASA ER-2 aircraft for flights that occurred during...

  6. CAMEX-4 ER-2 HIGH ALTITUDE DROPSONDE V1

    Data.gov (United States)

    National Aeronautics and Space Administration — The CAMEX-4 ER-2 High Altitude Dropsonde dataset was collected by the ER-2 High Altitude Dropsonde System (EHAD), which used dropwinsondes fitted with Global...

  7. CAMEX-4 ER-2 LIGHTNING INSTRUMENT PACKAGE (LIP) V1

    Data.gov (United States)

    National Aeronautics and Space Administration — The CAMEX-4 ER-2 Lightning Instrument Package (LIP) dataset was collected by the ER-2 LIP, which allows the vector components of the electric field (i.e, Ex, Ey, Ez...

  8. Senior Sport er læring i virkeligheden

    DEFF Research Database (Denmark)

    Meyer, Erna Rosenlund

    2014-01-01

    Samarbejde mellem fysioterapeutudddannelsen på UCN og Aalborg senior Sport er givende for alle parter, inklusiv studerende.......Samarbejde mellem fysioterapeutudddannelsen på UCN og Aalborg senior Sport er givende for alle parter, inklusiv studerende....

  9. Hvad skal danske hospitaler med ungecaféer?

    DEFF Research Database (Denmark)

    Kvisgaard Knudsen, Kristina; Bregnballe, Vibeke

    at forbedre unges oplevelse af at være indlagt, er der i Danmark etableret ungecaféer. Formål: At undersøge ungecaféers betydning for indlagte unge. Metode: Fire semistrukturerede interviews er foretaget med kronisk eller alvorligt syge unge i alderen 11-19 år. De unge har besøgt Café Nexus på Aarhus...

  10. Preparation and some properties of H/sub x/REBa2Cu3O7 (RE = Er, Nd, Dy, Ho, Gd) superconductors

    International Nuclear Information System (INIS)

    Johnson, J.; Suenaga, M.; Thompson, P.; Reilly, J.

    1988-01-01

    Hydrogen gas has been found to react directly with the subject oxides. Most exhibit a small region of H solid solubility which remains superconducting with a slight increase in critical temperature (1 to 2K). At higher H contents a hydrogen rich hydride phase precipitates which is amorphous. The H rich phases are not superconducting at 4K or above. Neutron diffraction studies of D/sub 1.55/YBa 2 Cu 3 O 7 confirm that the D rich phase is amorphous but that its precipitation causes increased microtwinning in the D saturated oxide. 12 refs., 3 figs

  11. Crystal structure of the compounds R8Ga3Co (R=Ce, Pr, Nd, Sm, Tb, Dy, Ho, Er, Tm)

    International Nuclear Information System (INIS)

    Grin', Yu.N.; Sichevich, O.M.; Gladyshevskij, R.E.; Yarmolyuk, Ya.P.

    1984-01-01

    The crystal structure of Pr 8 Ga 3 Co compounds is studied by the method of monocrystal (autodiffractometer, MoKsub(α)): space group P6 3 mc, a=10.489, c=6.910 A, Z=2. Coordination numbers of atoms are 11-14 for Pr, 11 for Ga, 7 for Co. The shortest interatomic distances are 3.365 for Pr-Pr, 3.047 for Pr-Ga, 2.75 A for Pr-Co. Pr 3 Ga 3 Co structure is akin to structures of R 2 In compounds (Ni 2 In type) and R 2 Ga (Cl 2 Pb type). Isostructural compounds form in systems of other rare earth metals with gallium and cobalt

  12. Effect of different B contents on the mechanical properties and cyclic oxidation behaviour of β-NiAlDy coatings

    International Nuclear Information System (INIS)

    Jia, Fang; Peng, Hui; Zheng, Lei; Guo, Hongbo; Gong, Shengkai; Xu, Huibin

    2015-01-01

    Highlights: • Dy and B co-doping strategy was proposed to modify β-NiAl coatings. • Mechanical properties and cyclic oxidation behaviour of coatings were investigated. • The addition of boron improves the mechanical properties of β-NiAl coatings. • Cyclic oxidation behaviour of coatings is influenced by chemical reactions of boron. - Abstract: NiAlDy coatings doped with 0.05 at.% and 1.00 at.% B were produced by electron beam physical vapour deposition (EB-PVD). The mechanical properties and cyclic oxidation behaviour of the coatings were investigated. Compared to the undoped NiAlDy coating, the B doped coatings exhibited improved ductility, higher micro-hardness and elastic modulus. The NiAlDy alloys revealed similar thermal expansion behaviour in a temperature range of 200–1100 °C. However, the addition of B did not show significant improvement in the cyclic oxidation resistance of NiAlDy coatings, on the contrary, the addition of 1.00 at.% B accelerated the scale growth rate and aggravated the scale rumpling, which led to severe spallation. Related mechanisms were preliminarily discussed

  13. White light generation through Zn(PO3)2 glass activated with Eu3+ and Dy3+

    International Nuclear Information System (INIS)

    Meza-Rocha, A.N.; Speghini, A.; Bettinelli, M.; Caldiño, U.

    2016-01-01

    A spectroscopic investigation of Zn(PO 3 ) 2 glass activated with Eu 3+ and Dy 3+ ions is carried out from photoluminescence data. White light emission is obtained in the glass phosphor, and it is due mainly to europium 5 D 0 → 7 F 2 and dysprosium 4 F 9/2 → 6 H 15/2,13/2 emissions, being Eu 3+ sensitized by Dy 3+ through a non-radiative energy transfer. Non-radiative energy transfer from Eu 3+ to Dy 3+ is also observed upon Eu 3+ excitation at 414 nm. An electric quadrupole–quadrupole interaction might be the dominant mechanism in the energy transfer among Dy 3+ and Eu 3+ ions, as it was revealed from decay time data. The tonality of the white phosphor can be shifted from neutral white (0.364, 0.387) of 4522 K, upon 348 nm excitation, to warm white (0.393, 0.394) of 3811 K, upon 445 nm excitation. Excitations at 348–445 nm range can be attained with InGaN based LED chips, so that Eu 3+ and Dy 3+ codoped Zn(PO 3 ) 2 glasses excited by these LED chips could be appropriated for solid state lighting technology as neutral and warm white light sources.

  14. Pige klik varsomt, thi scenen er skrå

    DEFF Research Database (Denmark)

    Sandvik, Kjetil

    2007-01-01

    At spille roller er en væsentlig del af mange computerspil. Nogle af disse roller er prædesignede af spildesignerne, andre er mere åbne og spilleren må derfor selv udfylde rollen. I såkaldte 'role-playing-games' (RPGs) har spilleren mulighed for at kreere sin egen rolle ved at anvende spillets...

  15. TCSP ER-2 DOPPLER RADAR (EDOP) V1

    Data.gov (United States)

    National Aeronautics and Space Administration — The TCSP ER-2 DOPPLER RADAR (EDOP) dataset was collected by the ER-2 Doppler radar (EDOP), which is an X-band (9.6 GHz) Doppler radar mounted in the nose of the ER-2...

  16. CAMEX-4 ER-2 DOPPLER RADAR V1

    Data.gov (United States)

    National Aeronautics and Space Administration — The CAMEX-4 ER-2 Doppler Radar dataset was collected by the ER-2 Doppler radar (EDOP), which is an X-band (9.6 GHz) Doppler radar mounted in the nose of ER-2. The...

  17. 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)

  18. 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)

  19. Ellers er det jo bare en stol

    DEFF Research Database (Denmark)

    Hansen, Per H.

    2013-01-01

    Brands. Kan man sælge Georg Jensen-smykker fra Bahrain? Eller Arne Jacobsens myrestole fra Polen? Der er masser af brands, der har fået halen på komedie ved at overse, hvorfor de selv har opnået så stærk en position i første omgang.......Brands. Kan man sælge Georg Jensen-smykker fra Bahrain? Eller Arne Jacobsens myrestole fra Polen? Der er masser af brands, der har fået halen på komedie ved at overse, hvorfor de selv har opnået så stærk en position i første omgang....

  20. ER-12-1 completion report

    International Nuclear Information System (INIS)

    Russell, C.E.; Gillespie, D.; Cole, J.C.; Drellack, S.L.

    1996-12-01

    The objective of drillhole ER-12-1 was to determine the hydrogeology of paleozoic carbonate rocks and of the Eleana Formation, a regional aquitard, in an area potentially downgradient from underground nuclear testing conducted in nearby Rainier Mesa. This objective was addressed through the drilling of well ER-12-1 at N886,640.26 E640,538.85 Nevada Central Coordinates. Drilling of the 1094 m (3588 ft) well began on July 19, 1991 and was completed on October 17, 1991. Drilling problems included hole deviation and hole instability that prevented the timely completion of this borehole. Drilling methods used include rotary tri-cone and rotary hammer drilling with conventional and reverse circulation using air/water, air/foam (Davis mix), and bentonite mud. Geologic cuttings and geophysical logs were obtained from the well. The rocks penetrated by the ER-12-1 drillhole are a complex assemblage of Silurian, Devonian, and Mississippian sedimentary rocks that are bounded by numerous faults that show substantial stratigraphic offset. The final 7.3 m (24 ft) of this hole penetrated an unusual intrusive rock of Cretaceous age. The geology of this borehole was substantially different from that expected, with the Tongue Wash Fault encountered at a much shallower depth, paleozoic rocks shuffled out of stratigraphic sequence, and the presence of an altered biotite-rich microporphyritic igneous rock at the bottom of the borehole. Conodont CAI analyses and rock pyrolysis analyses indicate that the carbonate rocks in ER-12-1, as well as the intervening sheets of Eleana siltstone, have been thermally overprinted following movement on the faults that separate them. The probable source of heat for this thermal disturbance is the microporphyritic intrusion encountered at the bottom of the hole, and its age establishes that the major fault activity must have occurred prior to 102.3+0.5 Ma (middle Cretaceous)

  1. Developing ER Stress Inhibitors for Treating ALS

    Science.gov (United States)

    2015-11-01

    reflux containing a catalytic amount of p-toluenesulphonic acid produces the nitroketone 3. Reduction of the nitro group in 3 with zinc and ammonium...chloride or hydrochloric acid produces the aminoketone 4. Treatment of the amino ketone 4 with an aldehyde 5 in a solution of acetic acid and...calcium reuptake by the ER. Using calcium mobilization assays we determined that active benzodiazepinone derivatives potentiate store-operated calcium

  2. ER-12-1 completion report

    Energy Technology Data Exchange (ETDEWEB)

    Russell, C.E.; Gillespie, D.; Cole, J.C.; Drellack, S.L. [and others

    1996-12-01

    The objective of drillhole ER-12-1 was to determine the hydrogeology of paleozoic carbonate rocks and of the Eleana Formation, a regional aquitard, in an area potentially downgradient from underground nuclear testing conducted in nearby Rainier Mesa. This objective was addressed through the drilling of well ER-12-1 at N886,640.26 E640,538.85 Nevada Central Coordinates. Drilling of the 1094 m (3588 ft) well began on July 19, 1991 and was completed on October 17, 1991. Drilling problems included hole deviation and hole instability that prevented the timely completion of this borehole. Drilling methods used include rotary tri-cone and rotary hammer drilling with conventional and reverse circulation using air/water, air/foam (Davis mix), and bentonite mud. Geologic cuttings and geophysical logs were obtained from the well. The rocks penetrated by the ER-12-1 drillhole are a complex assemblage of Silurian, Devonian, and Mississippian sedimentary rocks that are bounded by numerous faults that show substantial stratigraphic offset. The final 7.3 m (24 ft) of this hole penetrated an unusual intrusive rock of Cretaceous age. The geology of this borehole was substantially different from that expected, with the Tongue Wash Fault encountered at a much shallower depth, paleozoic rocks shuffled out of stratigraphic sequence, and the presence of an altered biotite-rich microporphyritic igneous rock at the bottom of the borehole. Conodont CAI analyses and rock pyrolysis analyses indicate that the carbonate rocks in ER-12-1, as well as the intervening sheets of Eleana siltstone, have been thermally overprinted following movement on the faults that separate them. The probable source of heat for this thermal disturbance is the microporphyritic intrusion encountered at the bottom of the hole, and its age establishes that the major fault activity must have occurred prior to 102.3+0.5 Ma (middle Cretaceous).

  3. Virtual Reality er dit nye Skype

    DEFF Research Database (Denmark)

    Bødker, Mads

    2016-01-01

    VR er mediet, der kan gøre den flade skærm og det begrænsede blik i for eksempel Skype til et lidt gammeldags digitalt samarbejde. Ved at sætte folk i stand til at kommunikere, dele virtuelle genstande og give dem en øget oplevelse af at være i et rum sammen, kan man mediere nye aspekter af samar...

  4. Hamlet er manden i mit liv

    DEFF Research Database (Denmark)

    Rösing, Lilian Munk

    2009-01-01

    Hamlet er manden i mit liv. Min elskede. Jeg har en drøm om at frelse ham. At redde ham ud af sin mors soveværelse og ind i mit. Væk fra det ødipale Helvede han befinder sig i, fastlåst mellem et svin af en faderskikkelse (Claudius) og en alt for idealiseret far (gamle Hamlet), vågende over sin m...

  5. En hat er vel en hat ... eller?

    DEFF Research Database (Denmark)

    Bøilerehauge, Dorrit

    2007-01-01

    Mens vi kører i høj fart på "the information highway" - i den helt store bus midt på vejen - glemmer vi ofte noget meget vigtigt i vores glæde over, at verden tilsyneladende åbner sig for os, og vi kan kommunikere med hele verden med ét klik. Vi glemmer, at selvom trafikskilte som oftest er ens -...

  6. Her er din motion i 2012

    DEFF Research Database (Denmark)

    Suhr, Lasse Kristian

    2014-01-01

    Motion i naturen, en indendørs fitnessform inspireret af junglens lianer og høj intensitet med crossfit. Det er ifølge en ekspert nogle af de træningstyper, der vil være mest populære i 2012. Året hvor fleksibilitet og frihed vil blive endnu vigtigere, for den måde vi holder os i form på....

  7. Sund livsstil er mere end fysik

    DEFF Research Database (Denmark)

    Nybo, Lars; Thing, Lone Friis; Astrup, Arne

    2015-01-01

    behandling af inaktivitetsrelaterede lidelser bør dog ikke være det vigtigste argument for at oplyse om og opfordre til en sund livsstil. Livskvalitetsaspektet skal være i højsædet, og det er for så vidt en legitim bekymring, at der kommer et overdrevet fokus på samfundsøkonomi og forebyggelse af somatisk...

  8. Protesen er også mig

    DEFF Research Database (Denmark)

    Østergaard, Elisabeth Bomholt

    at gøre med mennesker, der er blevet amputeret. Jeg mødte de primære informanter – flere af dem adskillige gange - forskellige steder. Jeg var hjemme hos tre, med én på café, mødtes med én på vedkommendes arbejdsplads, mødte syv på et fysioterapeutisk GenoptræningsSted (GS) for mennesker med benamputation...

  9. To steder er maden go´

    DEFF Research Database (Denmark)

    Auken, Sune

    2014-01-01

    Gennem en udlægning af et ganske enkelt reklamedigt tydeliggør artiklen en række af de grundlæggende træk der er på spil, når man fortolker en tekst på baggrund af dens genre. Det betyder, at artiklen arbejder med to overordnede spørgsmål 1) hvilke genrer kan teksten tilskrives, og hvad sker der ...

  10. Hvem er befrieren? Idealisme og realisme

    DEFF Research Database (Denmark)

    Rabjerg, Bjørn

    2017-01-01

    Artiklen fokuserer på K.E. Løgstrups (1905-81) begreb om forståelse ved at sætte det i perspektiv til (1) Platons Hulelignelse og (2) Martin Heideggers (1889-1976) udlægning af denne. Anliggendet er at pege på den tidlige og formative indvirkning, som Løgstrups møde med Heidegger, nazisme og...

  11. Friluftsinstallationer i træer

    DEFF Research Database (Denmark)

    Skov, Simon; Thomsen, Iben Margrete

    2015-01-01

    Abebaner, treetop walking, high rope adventure, slackline, træhuse og parkour-baner er alle installationer, som bruger træerne som støtte, enten midlertidigt eller permanent. Den nye sport, turistattraktionen eller team building-redskabet sætter i alle tilfælde træerne på prøve. Der følger positiv...

  12. SYP73 Anchors the ER to the Actin Cytoskeleton for Maintenance of ER Integrity and Streaming in Arabidopsis.

    Science.gov (United States)

    Cao, Pengfei; Renna, Luciana; Stefano, Giovanni; Brandizzi, Federica

    2016-12-05

    The endoplasmic reticulum (ER) is an essential organelle that spreads throughout the cytoplasm as one interconnected network of narrow tubules and dilated cisternae that enclose a single lumen. The ER network undergoes extensive remodeling, which critically depends on membrane-cytoskeleton interactions [1]. In plants, the ER is also highly mobile, and its streaming contributes significantly to the movement of other organelles [2, 3]. The remodeling and motility of the plant ER rely mainly on actin [4] and to a minor extent on microtubules [5]. Although a three-way interaction between the ER, cytosolic myosin-XI, and F-actin mediates the plant ER streaming [6], the mechanisms underlying stable interaction of the ER membrane with actin are unknown. Early electron microscopy studies suggested a direct attachment of the plant ER with actin filaments [7, 8], but it is plausible that yet-unknown proteins facilitate anchoring of the ER membrane with the cytoskeleton. We demonstrate here that SYP73, a member of the plant Syp7 subgroup of SNARE proteins [9] containing actin-binding domains, is a novel ER membrane-associated actin-binding protein. We show that overexpression of SYP73 causes a striking rearrangement of the ER over actin and that, similar to mutations of myosin-XI [4, 10, 11], loss of SYP73 reduces ER streaming and affects overall ER network morphology and plant growth. We propose a model for plant ER remodeling whereby the dynamic rearrangement and streaming of the ER network depend on the propelling action of myosin-XI over actin coupled with a SYP73-mediated bridging, which dynamically anchors the ER membrane with actin filaments. Copyright © 2016 Elsevier Ltd. All rights reserved.

  13. ER stress, autophagy, and RNA viruses

    Directory of Open Access Journals (Sweden)

    Jia-Rong eJheng

    2014-08-01

    Full Text Available Endoplasmic reticulum (ER stress is a general term for representing the pathway by which various stimuli affect ER functions. ER stress induces the evolutionarily conserved signaling pathways, called the unfolded protein response (UPR, which compromises the stimulus and then determines whether the cell survives or dies. In recent years, ongoing research has suggested that these pathways may be linked to the autophagic response, which plays a key role in the cell’s response to various stressors. Autophagy performs a self-digestion function, and its activation protects cells against certain pathogens. However, the link between the UPR and autophagy may be more complicated. These two systems may act dependently, or the induction of one system may interfere with the other. Experimental studies have found that different viruses modulate these mechanisms to allow them to escape the host immune response or, worse, to exploit the host’s defense to their advantage; thus, this topic is a critical area in antiviral research. In this review, we summarize the current knowledge about how RNA viruses, including influenza virus, poliovirus, coxsackievirus, enterovirus 71, Japanese encephalitis virus, hepatitis C virus, and dengue virus, regulate these processes. We also discuss recent discoveries and how these will produce novel strategies for antiviral treatment.

  14. 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.

  15. 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.

  16. 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.

  17. Anisotropic magnetic properties of RE2CoIn8 (RE=Pr, Nd, Dy) compounds

    International Nuclear Information System (INIS)

    Kratochvílová, Marie; Bartha, Attila; Diviš, Martin; Zubáč, Jan; Sechovský, Vladimír; Javorský, Pavel

    2014-01-01

    Single crystals of Pr 2 CoIn 8 , Nd 2 CoIn 8 and Dy 2 CoIn 8 have been successfully prepared for the first time and investigated by means of magnetization measurements. Anisotropy of the magnetic properties has been observed. The paramagnetic susceptibility data are interpreted in conjunction with results of first-principles calculations of the crystal-field parameters. The disagreement between the experimental paramagnetic Curie temperature values for the magnetic field applied along the a- and c-axis and the corresponding results of calculations for Pr 2 CoIn 8 and Nd 2 CoIn 8 can be attributed to a limited validity of the single-particle crystal-field interaction. The Van Vleck paramagnetism of Pr 2 CoIn 8 has been confirmed. The experimental data collected for Nd 2 CoIn 8 and Dy 2 CoIn 8 point to antiferromagnetic ordering below T N =9.6 and 16.7 K, respectively. It is shown that Nd 2 CoIn 8 undergoes two metamagnetic transitions at low temperatures in a field applied along the c-axis whereas the paramagnetic response at the perpendicular field demonstrates uniaxial magnetocrystalline anisotropy. Two metamagnetic transitions have been observed also in Dy 2 CoIn 8 . In this case, however, a metamagnetic transition can be induced also in magnetic fields applied within the basal plane. Comparing the properties of presented materials with the variety of other RE n TIn 3n+2 compounds certain features appear being universal across the series of their isostructural analogs.

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

    Directory of Open Access Journals (Sweden)

    Chanitsara Duangbubpa

    2015-07-01

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

  19. UV–OPTICAL OBSERVATION OF TYPE Ia SUPERNOVA SN 2013dy IN NGC 7250

    Energy Technology Data Exchange (ETDEWEB)

    Zhai, Qian; Zhang, Ju-Jia; Chang, Liang; Yi, Wei-Min; Wang, Chuan-Jun; Xin, Yu-Xin; Wang, Jian-Guo; Lun, Bao-Li; Zhang, Xi-Liang; Fan, Yu-Feng; Zheng, Xiang-Ming; Bai, Jin-Ming [Yunnan Observatories (YNAO), Chinese Academy of Sciences, Kunming 650011 (China); Wang, Xiao-Feng; Huang, Fan; Zhao, Xu-Lin [Physics Department and Tsinghua Center for Astrophysics (THCA), Tsinghua University, Beijing 100084 (China); Zhang, Tian-Meng [National Astronomical Observatories of China (NAOC), Chinese Academy of Sciences, Beijing 100012 (China); Liu, Zheng-Wei [Argelander-Institut für Astronomie, Auf dem Hügel 71, D-53121, Bonn (Germany); Brown, Peter J., E-mail: jujia@ynao.ac.cn [George P. and Cynthia Woods Mitchell Institute for Fundamental Physics and Astronomy, Texas A. and M. University, Department of Physics and Astronomy, 4242 TAMU, College Station, TX 77843 (United States)

    2016-05-01

    Extensive and independent observations of Type Ia supernova (SN Ia) SN 2013dy are presented, including a larger set of UBVRI photometry and optical spectra from a few days before the peak brightness to ∼ 200 days after explosion, and ultraviolet (UV) photometry spanning from t  ≈ –10 days to t  ≈ +15 days refers to the B band maximum. The peak brightness (i.e., M {sub B} = –19.65 ± 0.40 mag; L {sub max} = [1.95 ± 0.55] × 10{sup 43} erg s{sup −1}) and the mass of synthesized {sup 56}Ni (i.e., M ({sup 56}Ni) = 0.90 ± 0.26 M {sub ⊙}) are calculated, and they conform to the expectation for an SN Ia with a slow decline rate (i.e., Δ m {sub 15}( B ) = 0.90 ± 0.03 mag). However, the near infrared (NIR) brightness of this SN (i.e., M {sub H} = –17.33 ± 0.30 mag) is at least 1.0 mag fainter than usual. Besides, spectroscopy classification reveals that SN 2013dy resides on the border of “core normal” and “shallow silicon” subclasses in the Branch et al. classification scheme, or on the border of the “normal velocity” SNe Ia and 91T/99aa-like events in the Wang et al. system. These suggest that SN 2013dy is a slow-declining SN Ia located on the transitional region of nominal spectroscopic subclasses and might not be a typical normal sample of SNe Ia.

  20. MicroRNAs meet calcium: joint venture in ER proteostasis.

    Science.gov (United States)

    Finger, Fabian; Hoppe, Thorsten

    2014-11-04

    The endoplasmic reticulum (ER) is a cellular compartment that has a key function in protein translation and folding. Maintaining its integrity is of fundamental importance for organism's physiology and viability. The dynamic regulation of intraluminal ER Ca(2+) concentration directly influences the activity of ER-resident chaperones and stress response pathways that balance protein load and folding capacity. We review the emerging evidence that microRNAs play important roles in adjusting these processes to frequently changing intracellular and environmental conditions to modify ER Ca(2+) handling and storage and maintain ER homeostasis. Copyright © 2014, American Association for the Advancement of Science.

  1. PTFE Additive and Re-annealing Effect on Thermoluminescence Response of CaSO4:Dy Derived from Co-precipitation Method

    Science.gov (United States)

    Nuraeni, Nunung; Dwi Septianto, Ricky; Iskandar, Ferry; Haryanto, Freddy; Waris, Abdul; Hiswara, Eri

    2017-07-01

    Effect of re-annealing treatment in thermoluminescence response of thermoluminescent dosimeter (TLD) CaSO4:Dy and CaSO4:Dy with PTFE (Polytetrafluoroethylene) addition was investigated. CaSO4:Dy was prepared by a co-precipitation method. The PTFE was added before re-annealing treatment which the mass ratio of CaSO4:Dy and PTFE was fixed to 2:3. The re-annealing treatments of the samples were done at temperature 700 °C for 1 hr. The obtained samples were characterized using a Fourier-transform infrared (FTIR) and X-ray diffraction (XRD) to observe the molecule bonding in sample and crystal properties, respectively. From the experimental results, it was observed that the thermoluminescence intensity of CaSO4:Dy, CaSO4:Dy re-annealed at 700 °C, and CaSO4:Dy + PTFE re-annealed at 700 °C are 57.03, 75.15, and 1191.11 nC, respectively. The intensity of 700 °C-re-annealed CaSO4:Dy increased significantly after PTFE addition.

  2. Influence of ageing treatment on microstructure, mechanical and bio-corrosion properties of Mg-Dy alloys.

    Science.gov (United States)

    Yang, Lei; Huang, Yuanding; Feyerabend, Frank; Willumeit, Regine; Kainer, Karl Ulrich; Hort, Norbert

    2012-09-01

    Mg-Dy alloys have shown to be promising for medical applications. In order to investigate the influence of ageing treatment on their mechanical and corrosion properties, three Mg-xDy alloys (x=10, 15, 20 wt%) were prepared. Their microstructure, mechanical and corrosion behavior were investigated. The results indicate that ageing at 250 °C has little influence on the mechanical and corrosion properties. In contrast, ageing at 200 °C significantly increases the yield strength, and reduces the ductility. After ageing at 200 °C, the corrosion rate of Mg-20Dy alloy increases largely in 0.9 wt% NaCl solution, but remains unchanged in cell culture medium. Copyright © 2012 Elsevier Ltd. All rights reserved.

  3. Bright emission via energy transfer from Dy to Tb in Bi2SiO5 nanophosphor

    Science.gov (United States)

    Kumari, Pushpa; Dwivedi, Y.

    2018-01-01

    The present article discusses the optical and structural properties of Tb and Dy co-doped Bi2SiO5 nanophosphors which were synthesized by Co-precipitation method. The synthesized sample contains plate-like morphology of uniform thickness ∼200 nm. Prepared samples were found of average crystallite size ∼20 nm, which yield bright yellow dominating white emission and green emission, in Dy: Bi2SiO5 and Tb: Bi2SiO5 nanophosphor, respectively under UV-light excitation. We have reported one-way efficient energy transfer from Dy to Tb ion, which facilitates precise colour tuning ability. The energy transfer phenomenon was well explored using, photoexcitation, photoluminescence and time-resolved luminescence techniques.

  4. Order-disorder type critical behavior at the magnetoelectric phase transition in multiferroic DyMnO3

    Science.gov (United States)

    Schiebl, M.; Shuvaev, A.; Pimenov, Anna; Johnstone, G. E.; Dziom, V.; Mukhin, A. A.; Ivanov, V. Yu.; Pimenov, A.

    2015-06-01

    We present the results of detailed dielectric investigations of the relaxation dynamics in DyMnO3 multiferroic manganite. A strong low-frequency relaxation process near the paraelectric-ferroelectric phase transition is observed. We provide experimental evidence to show that this relaxation mode corresponds to a chirality switching of the spin cycloid in DyMnO3. We demonstrate that the relaxation dynamics in DyMnO3 is typical for an order-disorder phase transition and may be understood within a simple model with a double-well potential. These results suggest the interpretation of the paraelectric sinusoidal phase in manganites as a dynamical equilibrium of magnetic cycloids with opposite chiralities.

  5. The onset of quadrupole ordering at the structural phase transition in DyB sub 2 C sub 2

    CERN Document Server

    Tanaka, Y; Katsumata, K; Tamasaku, K; Ishikawa, T; Kawamura, N; Suzuki, M; Katori, H A; Lovesey, S W; Yamauchi, H; Onodera, H; Yamaguchi, Y

    2003-01-01

    X-ray diffraction and heat capacity data for DyB sub 2 C sub 2 are used to derive quantitative information about the structural phase transition at 24.7 K. A successful interpretation is achieved in terms of a continuous transition to a crystal structure belonging to the space group P4 sub 2 /mnm (No 136) that supports a motif of Dy 4f quadrupoles which belong to the A sub g representation of the point group C sub 2 sub h for the Dy site in the distorted structure. There is evidence in favour of the Ising universality class for the transition, including a critical exponent beta = 0.30 +- 0.02 and a near-logarithmic divergence of the heat capacity. (letter to the editor)

  6. Effect of pH on the Dye Absorption of Jute Fibre Dyed with Direct Dyes

    OpenAIRE

    H. Mondal; Md. Khademul Islam

    2014-01-01

    Dyeing of direct dyes, viz. Direct Yellow 29, Direct Orange 31 and Titan Yellow, has been carried out on jute fibre in the presence of sodium sulphate as an electrolyte. The effect of pH on dyeing have been studied and the results showed comparatively better dye uptake at pH 8.0. Assesment of light and wash fastness, acid and alkali spottings, and breaking strength of direct dyed jute fibre was carried out. Direct Orange 31 showed comparatively better fastness properties than other dyes.

  7. CaSO4: Dy + Teflon dosimetric pellets for X, beta and gamma radiation detection

    International Nuclear Information System (INIS)

    Campos, L.L.; Lima, M.F.

    1987-08-01

    CaSO 4 : Dy + TEFLON dosimetric pellets with high sensitivity and low cost for X, beta and gamma radiation monitoring were studied and developed by the Dosimetric Material Production Laboratory of the Radiological Protection Departament and are disposable for sale. The thickness of the pellets are suitable for X, beta and gamma radiation measurements. The dosimetric properties of these pellets were determined and presented in this work. The results show the usefulness of 0,20mm thick pellets for beta radiation monitoring and 0,80mm thick pellets for x and gamma radiation detection. (Author) [pt

  8. Improvement in the dosimetric CaSO4: Dy obtention method

    International Nuclear Information System (INIS)

    Campos, L.L.; Frutuoso, P.H.; Souto, V.J.

    1989-08-01

    With the purpose of saving up in the dosimetric CaSO 4 : Dy production, a new method was developed to obtain single crystals. In this method the nitrogen flux used to carry the acid vapour was substituted by compressed air. It was compared all dosimetric properties of the crystals. There is no alteration in the glow curve. The sensitivity is the same in both cases and the lower detection limit is 3.8 x 10 -8 C.Kg -1 (150 μR) [pt

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

    Science.gov (United States)

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

    2017-09-01

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

  10. The use of polyvinyl chloride dyed with bromo cresol purple in radiation dosimetry

    International Nuclear Information System (INIS)

    Kattan, M.; Al-Kassiri, H.; Daher, Y.

    2010-09-01

    In this work,the use of polyvinyl chloride (PVC) dyed with Bromo cresol purple in high dose radiation dosimetry has been studied according to the radio chromic change using visible spectrophotometry. The results show linear relationship between the relative absorbance (response) and the absorbed dose at the wavelength 417 nm in the range of 0-50 kGy. Dose rate, irradiation temperature, dye intensity have been investigated and found to be independent of the response. The effects of post-irradiation storage in dark and indirect daylight conditions on dosimetry performance are discussed. (Author)

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

    OpenAIRE

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

    2016-01-01

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

  12. Structure and magnetic properties of hot deformed Nd{sub 2}Fe{sub 14}B magnets doped with DyH{sub x} nanoparticles

    Energy Technology Data Exchange (ETDEWEB)

    Wang, C.G.; Yue, M., E-mail: yueming@bjut.edu.cn; Zhang, D.T.; Liu, W.Q.; Zhang, J.X.

    2016-04-15

    Commercial NdFeB powders mixed with DyH{sub x} nanoparticles are hot pressed and hot deformed into anisotropic magnets by Spark Plasma Sintering (SPS). The hot deformed magnet exhibits strong c-axis crystallographic texture. The coercivity of the magnet doped with 1.0 wt% DyH{sub x} is increased by 66.7%, compared with the magnet without DyH{sub x}, while the remanence decreases only by 3%. TEM observation shows that there exists a continuous (Nd,Dy){sub 2}Fe{sub 14}B layer between Nd-rich phase and NdFeB main phase. - Highlights: • The hot deformed magnet exhibits strong c-axis crystallographic texture. • The coercivity of the magnet significantly improved, and the remanence decreases slight. • TEM observation shows that there exists a continuous (Nd,Dy){sub 2}Fe{sub 14}B layer.

  13. Æstetik er tilbage som nøgle til at forstå samtiden

    DEFF Research Database (Denmark)

    Sharma, Devika

    2013-01-01

    Casper Christensen er gakket, Hello Kitty er nuttet og konceptkunsten er interessant. Her er tre nye kategorier at forstå senkapitalismen med. I anledning af Sianne Ngais bog "Our aesthetic categories: zany, cute, interesting" .......Casper Christensen er gakket, Hello Kitty er nuttet og konceptkunsten er interessant. Her er tre nye kategorier at forstå senkapitalismen med. I anledning af Sianne Ngais bog "Our aesthetic categories: zany, cute, interesting" ....

  14. Field programmable gate array (FPGA) implementation of dynamic compensation (DyCom) algorithm for vanadium self-powered neutron detectors

    International Nuclear Information System (INIS)

    Das, A.; Dixit, M.Y.; Das, D.; Kulkarni, C.P.; Chaganty, S.P.; Kataria, S.K.; Ramachandiran, V.

    2003-01-01

    Full text: A new on-line digital signal processing (DSP) based Dynamic Compensation (DyCom) algorithm has been developed [Das 1999] to speed-up the response time of slow-responding Vanadium self-powered neutron detectors. The algorithm is based on the principles of direct inversion and on-line nonlinear (median) filtering. The algorithm was tested at different research and power reactors on a PC based platform with encouraging results [Das 2001]. This paper discusses the stand-alone FPGA implementation of the DyCom algorithm with the experimental results obtained with prototype FPGA boards

  15. Correlated spin glass generated by structural disorder in the amorphous Dy6Fe74B20 alloy

    Science.gov (United States)

    Tejada, J.; Martinez, B.; Labarta, A.; Chudnovsky, E. M.

    1991-10-01

    Magnetic properties of the amorphous Dy-Fe-B alloy are studied in terms of the correlated-spin-glass approach of Chudnovsky et al.$-- Features predicted by the theory are clearly observed in the experiment. It is shown that the magnetization law may be presented in the form where it is determined by the dimensionless correlation function of structural disorder, C(y), only. The analysis of the magnetization curve allows one to distinguish between different models of disorder in amorphous solids. Experimental data on Dy-Fe-B are in favor of C=exp(-1/2y2).

  16. Correlated spin glass generated by structural disorder in the amorphous Dy6Fe74B20 alloy

    International Nuclear Information System (INIS)

    Tejada, J.; Martinez, B.; Labarta, A.; Chudnovsky, E.M.

    1991-01-01

    Magnetic properties of the amorphous Dy-Fe-B alloy are studied in terms of the correlated-spin-glass approach of Chudnovsky et al.$---- Features predicted by the theory are clearly observed in the experiment. It is shown that the magnetization law may be presented in the form where it is determined by the dimensionless correlation function of structural disorder, C(y), only. The analysis of the magnetization curve allows one to distinguish between different models of disorder in amorphous solids. Experimental data on Dy-Fe-B are in favor of C=exp(-1/2y 2 )

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

    DEFF Research Database (Denmark)

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

    2011-01-01

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

  18. On the Use of an ER-213 Detonator to Establish a Baseline for the ER-486

    Energy Technology Data Exchange (ETDEWEB)

    Thomas, Keith A. [Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Liechty, Gary H. [Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Jaramillo, Dennis C. [Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Munger, Alan C. [Los Alamos National Lab. (LANL), Los Alamos, NM (United States); McHugh, Douglas C. [Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Kennedy, James E. [Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

    2014-08-19

    This report documents a series of tests using a TSD-115 fireset coupled with an ER-213, a gold exploding bridgewire (EBW) detonator. These tests were designed to fire this EBW with a smaller fireset to obtain current and voltage data as well as timing information at voltage levels below, above, and throughout the threshold firing region. This study could then create a database for comparison to our current ER-486 EBW development, which is designed to be a lower voltage (<500V) device.

  19. GR and ER co-activation alters the expression of differentiation genes and associates with improved ER+ breast cancer outcome

    Science.gov (United States)

    West, Diana C.; Pan, Deng; Tonsing-Carter, Eva Y.; Hernandez, Kyle M.; Pierce, Charles F.; Styke, Sarah C.; Bowie, Kathleen R.; Garcia, Tzintzuni I.; Kocherginsky, Masha; Conzen, Suzanne D.

    2016-01-01

    In estrogen receptor (ER)-negative breast cancer (BC), high tumor glucocorticoid receptor (GR) expression has been associated with a relatively poor outcome. In contrast, using a meta-analysis of several genomic datasets, here we find that tumor GR mRNA expression is associated with improved ER+ relapse-free survival (RFS) (independently of progesterone receptor (PR) expression). To understand the mechanism by which GR expression is associated with a better ER+ BC outcome, the global effect of GR-mediated transcriptional activation in ER+ BC cells was studied. Analysis of GR chromatin immunoprecipitation followed by high-throughput sequencing (ChIP-seq) in ER+/GR+ MCF-7 cells revealed that upon co-activation of GR and ER, GR chromatin association became enriched at proximal promoter regions. Furthermore, following ER activation, increased GR chromatin association was observed at ER, FOXO, and AP1 response elements. In addition, ER associated with GR response elements, suggesting that ER and GR interact in a complex. Co-activation of GR and ER resulted in increased expression (relative to ER activation alone) of transcripts that encode proteins promoting cellular differentiation (e.g. KDM4B, VDR) and inhibiting the Wnt-signaling pathway (IGFBP4). Finally, expression of these individual pro-differentiation genes was associated with significantly improved RFS in ER+ BC patients. Together, these data suggest that the co-expression and subsequent activity of tumor cell GR and ER contribute to the less aggressive natural history of early-stage BC by coordinating the altered expression of genes favoring differentiation. Implications The interaction between estrogen and glucocorticoid receptor activity highlights the importance of context-dependent nuclear receptor function in cancer. PMID:27141101

  20. COPII-Dependent ER Export: A Critical Component of Insulin Biogenesis and β-Cell ER Homeostasis.

    Science.gov (United States)

    Fang, Jingye; Liu, Ming; Zhang, Xuebao; Sakamoto, Takeshi; Taatjes, Douglas J; Jena, Bhanu P; Sun, Fei; Woods, James; Bryson, Tim; Kowluru, Anjaneyulu; Zhang, Kezhong; Chen, Xuequn

    2015-08-01

    Pancreatic β-cells possess a highly active protein synthetic and export machinery in the endoplasmic reticulum (ER) to accommodate the massive production of proinsulin. ER homeostasis is vital for β-cell functions and is maintained by the delicate balance between protein synthesis, folding, export, and degradation. Disruption of ER homeostasis by diabetes-causing factors leads to β-cell death. Among the 4 components to maintain ER homeostasis in β-cells, the role of ER export in insulin biogenesis is the least understood. To address this knowledge gap, the present study investigated the molecular mechanism of proinsulin ER export in MIN6 cells and primary islets. Two inhibitory mutants of the secretion-associated RAS-related protein (Sar)1 small GTPase, known to specifically block coat protein complex II (COPII)-dependent ER export, were overexpressed in β-cells using recombinant adenoviruses. Results from this approach, as well as small interfering RNA-mediated Sar1 knockdown, demonstrated that defective Sar1 function blocked proinsulin ER export and abolished its conversion to mature insulin in MIN6 cells, isolated mouse, and human islets. It is further revealed, using an in vitro vesicle formation assay, that proinsulin was packaged into COPII vesicles in a GTP- and Sar1-dependent manner. Blockage of COPII-dependent ER exit by Sar1 mutants strongly induced ER morphology change, ER stress response, and β-cell apoptosis. These responses were mediated by the PKR (double-stranded RNA-dependent kinase)-like ER kinase (PERK)/eukaryotic translation initiation factor 2α (p-eIF2α) and inositol-requiring protein 1 (IRE1)/x-box binding protein 1 (Xbp1) pathways but not via activating transcription factor 6 (ATF6). Collectively, results from the study demonstrate that COPII-dependent ER export plays a vital role in insulin biogenesis, ER homeostasis, and β-cell survival.

  1. Evaluation of neutron cross sections for a complete set of Dy isotopes

    International Nuclear Information System (INIS)

    Kim, Hyeong Il; Herman, M.; Mughabghab, S.F.; Oblozinsky, P.; Lee, Young-Ouk

    2008-01-01

    Neutron cross sections for a complete set of Dy isotopes, 156,158,160,161,162,163,164 Dy, were evaluated in the incident energy range from 10 -5 eV to 20 MeV. In the low energy region, including thermal and resolved resonances, our evaluations are based on the latest data published in the Atlas of Neutron Resonances. In the unresolved resonance region we performed additional evaluation by using the averages of the resolved resonances and adjusting them to the experimental data. In the fast neutron region, we used the nuclear reaction model code EMPIRE-2.19 with the model parameters adjusted to the experimental data. The results are compared with the available experimental data and with the existing nuclear data libraries, including ENDF/B-VI.8 and JEFF-3.1. The new evaluations are suitable for neutron transport calculations and they were adopted by the new US evaluated nuclear data library, ENDF/B-VII.0, released in December 2006

  2. Novel thermoluminescence foils for 2-D clinical dosimetry, based on CaSO{sub 4}:Dy

    Energy Technology Data Exchange (ETDEWEB)

    Klosowski, M., E-mail: mariusz.klosowski@ifj.edu.p [Institute of Nuclear Physics, Polish Academy of Sciences, ul. Radzikowskiego 152, 31-342 Krakow (Poland); Czopyk, L. [Institute of Nuclear Physics, Polish Academy of Sciences, ul. Radzikowskiego 152, 31-342 Krakow (Poland); Kisielewicz, K.; Kabat, D. [Centre of Oncology, Maria Sklodowska-Curie Memorial Institute, ul. Garncarska 11, 31-115 Krakow (Poland); Olko, P. [Institute of Nuclear Physics, Polish Academy of Sciences, ul. Radzikowskiego 152, 31-342 Krakow (Poland); Waligorski, M.P.R. [Centre of Oncology, Maria Sklodowska-Curie Memorial Institute, ul. Garncarska 11, 31-115 Krakow (Poland)

    2010-03-15

    The newly developed two-dimensional thermoluminescence (TL) foils made from CaSO{sub 4}:Dy TL powder and the high temperature polymer PFA, were tested for their dosimetric properties. The results were evaluated using laboratory TL reader with PCO CCD camera and round planchet heater, 72 mm in diameter. 55 x 55 x 0.3 mm{sup 3} foils were tested for dose response, reproducibility and spatial resolution. It was found that the detectors are linear up to at least 2 Gy and their spatial resolution is about 1 mm. A loss of sensitivity with repeated re-uses was observed (9% in 10 uses). It is attributable to the darkening of the detector due to oxidizing of impurities gathering at its surface and may be avoided by application of proper cleaning procedure. The foils were tested for measurements of 2-D dose distribution on 60 MeV proton beam at IFJ Krakow. The results show that 2-D TL foils based on CaSO{sub 4}:Dy can be a useful tool for quality assurance of proton beams.

  3. Optical properties of Dy3+ doped bismuth boro-tellurite glasses for WLED applications

    Science.gov (United States)

    Karthikeyan, P.; Marimuthu, K.

    2016-05-01

    The Dy3+ doped bismuth boro-tellurite glasses with the chemical composition (79.5-x) B2O3+xTeO2+10Bi2O3+10PbF2+0.5Dy2O3 (where x = 10, 20, 30 and 40 in wt%) have been prepared by melt quenching technique. The optical properties of the prepared glasses have been studied through absorption and emission spectral measurements. The bonding parameters, optical band gap energy, Urbach's energy and Judd-Ofelt (JO) intensity parameters (Ωλ, λ = 2, 4 and 6) were calculated from the absorption spectra. The radiative properties like transition probability (A), stimulated emission cross-section (σPE) and branching ratios (βR) were calculated from the emission spectra using JO theory. The strong emissions in the visible region, large stimulated emission cross-section and higher branching ratio values observed for the title glasses are found to be suitable for lasers and WLED applications.

  4. Concentration dependent spectroscopic properties of Dy{sup 3+} ions doped boro-phosphate glasses

    Energy Technology Data Exchange (ETDEWEB)

    Mariyappan, M.; Marimuthu, K., E-mail: mari-ram2000@yahoo.com [Department of Physics, Gandhigram Rural Institute - Deemed University, Gandhigram – 624 302 (India)

    2016-05-23

    Dy{sup 3+} ions doped boro-phosphate glasses have been synthesized by melt quenching method and characterized through FTIR, absorption and luminescence spectral measurements. The presence of various stretching and bending vibrations of different borate and phosphate groups were identified from the FTIR spectra. In order to examine the electronic band structure of the studied glasses, Optical energy gap (E{sub opt}) and Urbach energy (ΔE) values were estimated from the absorption spectra. The Judd-Ofelt (JO) intensity parameters were calculated to examine the symmetry of the ligand environment around the Dy{sup 3+} ions site. The emission spectra exhibit two intense emission bands at around 482 nm (blue) and 574 nm (yellow) corresponding to the {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 emission spectra were characterized through Commission International d’Eclairage (CIE) 1931 chromaticity diagram to explore its suitability for WLED applications.

  5. CaSO4:Dy and/or Tm: study of its properties for dosimetry application

    International Nuclear Information System (INIS)

    Ferreira, M.M.

    1979-01-01

    In order obtain in practical and cheap solid state dosimeter with high sensitivity, a technique initially developed to cold press a mixture of suitable materials in their powder form sensitive to radiation. The material initially used was natural CaF 2 (fluorite) for this salt was extensively studied in radiation dosimetry since it shows a thermoluminescent (TL) effect after radiation. However, natural calcium fluorite shows two main disadvantages: its high senstivity to room light and the impossibility to control its impurity content due to its natural origin. Calcium sulphate was thus used as a good substitute of fluorite. Rare earths doped calcium sulphate shows a high TL sensitivity and is not disturbed by light. It is also easily obtained in the laboratory under controlled conditions so to get reproducible impurity content. The best dosimeters that can be produced with rare earth doped calcium sulphate are CaSO 4 :Dy and CaSO 4 :Tm. Calcium sulphate, simultaneously doped with Tm and Dy was produced and 100% increase was obtained in the TL sensitivity when compared with the individually are earth doped calcium sulphate. (Author) [pt

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

    Energy Technology Data Exchange (ETDEWEB)

    Dines, E.L.

    1985-04-01

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

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

    Energy Technology Data Exchange (ETDEWEB)

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

    2008-01-25

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

  8. Thermal studies on Pr(III) and Dy(III) succinates

    International Nuclear Information System (INIS)

    Kaul, M.L.; Sharma, R.M.

    1991-01-01

    The compounds, Pr 2 C 12 H 12 O 12 .6H 2 O and Dy 2 C 12 H 12 O 12 8H 2 O have been prepared and characterised by elemental analysis and I.R. spectroscopy. TG and DTA studies show that these lose four and six water molecules respectively in the first step, yielding M 2 C 12 H 12 O 12 .2H 2 O (M=Pr or Dy) and form the anhydrous species, M 2 C 12 H 12 O 12 in the second step. There is an indication of formation of MO(CO 3 )sub(1/2) in the case of Pr compound. M 2 O 3 appears as the final stable product in each case. Kinetic parameters like apparent order, energy and entropy of activation for the dehydration process have been arrived at by analysing the data using Piloyan-Novikova, Coats-Redfern and Horowitz-Metzger equations. α vs. T curves show that there is no indication of branching or surface nucleation preceding the dehydration process which in both the compounds proceeds with phase boundary mechanism. (author). 10 refs., 8 figs., 2 tabs

  9. Photoluminescence of Er in SiOx

    International Nuclear Information System (INIS)

    Wan Jun; Sheng Chi; Lu Fang; Gong Dawei; Fan Yongliang; Lin Feng; Wang Xun

    1998-01-01

    Erbium-doped SiO x is prepared by molecular beam epitaxy. The influence of Er on the incorporation of O is studied by using Auger spectroscopy. Photoluminescence (PL) peaks around the wave-length of 1.53 μm have been observed within the temperature range of 18 to 300 K after annealing. The relationship between PL intensity and annealing temperature is discussed. The temperature dependence of the PL intensity shows an exponential decay with an activation energy of 12 meV at low temperatures ( 100 K)

  10. "LICENS ER NOGET VI GIVER TIL HINANDEN"

    OpenAIRE

    Svendsen, Nana Lysbo; Birksholm, Sarah Schlander; Rosendahl, Rasmus; Albrechtsen, Nadja Loran

    2013-01-01

    This study consists of a rhetorical analysis of how the Danish Broadcasting Corporation argues for the compulsory license fee in their campaign video: ’Licens er noget vi giver til hinanden’. On the assumption that a visual product can argue on equal terms with the spoken language, the paper will look at the specific visual tools that are used in the argumentation and the portrayal of the concept of public service and the license fee. In extension to this the paper will examine if the vid...

  11. Binary magnetic structures in HoEr

    DEFF Research Database (Denmark)

    Howard, B.K.; Bohr, J.

    1991-01-01

    The magnetic structure of a single crystal of the rare earth random alloy Ho50% Er50% has been investigated by elastic neutron diffraction measurements in the temperature range 120-10 K. Three distinct magnetic phases are identified below the Neel temperature of 104 K. The high-temperature phase...... observed between 104 K and 47.5 K is a binary magnetic structure where the holmium and erbium moments belong to different modulated c-axis spirals. The intermediate-temperature phase between 47.5 K and 35 K is a simple basal plane spiral. Below 35 K, the measurements suggest a ferrimagnetic structure...

  12. Pancreatic insulin content regulation by the estrogen receptor ER alpha.

    Directory of Open Access Journals (Sweden)

    Paloma Alonso-Magdalena

    Full Text Available The function of pancreatic beta-cells is the synthesis and release of insulin, the main hormone involved in blood glucose homeostasis. Estrogen receptors, ER alpha and ER beta, are important molecules involved in glucose metabolism, yet their role in pancreatic beta-cell physiology is still greatly unknown. In this report we show that both ER alpha and ER beta are present in pancreatic beta-cells. Long term exposure to physiological concentrations of 17beta-estradiol (E2 increased beta-cell insulin content, insulin gene expression and insulin release, yet pancreatic beta-cell mass was unaltered. The up-regulation of pancreatic beta-cell insulin content was imitated by environmentally relevant doses of the widespread endocrine disruptor Bisphenol-A (BPA. The use of ER alpha and ER beta agonists as well as ER alphaKO and ER betaKO mice suggests that the estrogen receptor involved is ER alpha. The up-regulation of pancreatic insulin content by ER alpha activation involves ERK1/2. These data may be important to explain the actions of E2 and environmental estrogens in endocrine pancreatic function and blood glucose homeostasis.

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

    Energy Technology Data Exchange (ETDEWEB)

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

    2011-10-15

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

  14. The effect of core-valence intra-atomic quadrupolar interaction in resonant x-ray scattering at the Dy M4,5 edges in DyB2C2.

    Science.gov (United States)

    Fernández-Rodríguez, Javier; Mirone, Alessandro; Staub, Urs

    2010-01-13

    The dependences on energy of the resonant soft x-ray Bragg diffraction intensities in DyB(2)C(2) for the (00½) reflection at the Dy M(4,5) edges have been calculated with an atomic multiplet Hamiltonian including the effect of the crystal field and introducing an intra-atomic quadrupolar interaction between the 3d core and 4f valence shell. These calculations are compared with experimental results (Mulders et al 2006 J. Phys.: Condens. Matter 18 11195) for the antiferroquadrupolar and antiferromagnetic phases of DyB(2)C(2). We reproduce all the features appearing in the (00½) reflection energy profile in the antiferroquadrupolar ordered phase, and we reproduce the behaviour of the resonant x-ray scattering intensity at different energies in the vicinity of the Dy M(5) edge when the temperature is lowered within the antiferromagnetic phase. These calculations show that a detailed description of the energy dependences of resonant x-ray scattering signals at the M edges in 4f and 5f systems with multipolar ordering may require the inclusion of an aspherical intra-atomic Coulomb interaction.

  15. Synthesis of Er and Er : Yb doped sol–gel derived silica glass and ...

    Indian Academy of Sciences (India)

    Unknown

    doped samples showed enhanced absorption due to 2F7/2 → 2F5/2 transition. The absorption and ... Er3+ emission transition occurs within this wavelength ... reagent) grade. Calculated amount of dopant salts were poured in TEOS under stirring condition at room tem- perature. The molar ratio of TEOS : H2O : HCl was.

  16. Minimising Immunohistochemical False Negative ER Classification Using a Complementary 23 Gene Expression Signature of ER Status

    DEFF Research Database (Denmark)

    Li, Qiyuan; Eklund, Aron Charles; Birkbak, Nicolai Juul

    2010-01-01

    with clinical outcome. METHODOLOGY/PRINCIPAL FINDINGS: Firstly, ER status was discriminated by fitting the bimodal expression of ESR1 to a mixed Gaussian model. The discriminative power of ESR1 suggested bimodal expression as an efficient way to stratify breast cancer; therefore we identified a set of genes...

  17. Synthesis of Er and Er : Yb doped sol–gel derived silica glass and ...

    Indian Academy of Sciences (India)

    Unknown

    indicated in TGA curve). The weight loss at elevated tempe- ratures is probably due to removal of water during con-. Figure 1. Photograph of a gel sample sintered at 900°C. Figure 2. DTA curve for 1⋅0 mol% of Er2O3 doped silica gel. Figure 3.

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

    Energy Technology Data Exchange (ETDEWEB)

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

    2012-04-15

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

  19. Vortex dynamics at subcritical currents at microwave frequencies in DyBa2Cu3O7-δ thin films

    NARCIS (Netherlands)

    Banerjee, Tamalika; Bagwe, V.C.; John, J.; Pai, S.P.; Kanjilal, D.

    2004-01-01

    We have investigated the dynamics of vortices at subcritical microwave currents in dc magnetic fields (up to 0.8 T) in epitaxial DyBa2Cu3O7-δ (DBCO) thin films. Microwave measurements were performed using microstrip resonators as test vehicles at 4.88 GHz and 9.55 GHz on laser ablated DBCO thin

  20. Near white light emitting ZnAl2O4:Dy3+ nanocrystals: Sol–gel synthesis and luminescence studies

    International Nuclear Information System (INIS)

    Kumar, Mithlesh; Gupta, Santosh K.; Kadam, R.M.

    2016-01-01

    Highlights: • ZnAl 2 O 4 :Dy 3+ spinel synthesized using sol–gel method. • Characterized by XRD, SEM and PL spectroscopy. • Investigations of emission, excitation and lifetime properties. • Evaluation of defect centers and trap parameters of the system. • Evaluation of CIE indices of near white light emitting phosphor. - Abstract: ZnAl 2 O 4 :Dy 3+ nanoparticles were synthesized using citrate sol–gel method and characterized systematically using X-ray diffraction, scanning electron microscopy and photoluminescence spectroscopy. Emission spectrum of pure ZnAl 2 O 4 shows intense violet blue emission under ultra violet irradiation. Based on electron paramagnetic resonance (EPR) results; it was attributed to presence of singly ionized oxygen vacancy centres in ZnAl 2 O 4 . On doping Dy 3+ in ZnAl 2 O 4 , complete host–dopant energy transfer does not take place. Local structural investigation and lifetime measurements reveal that dysprosium ion is distributed between both Zn 2+ and Al 3+ sites. Near white light from ZnAl 2 O 4 :Dy 3+ is attributed to combined host and dopant luminescence. The trap parameters such as activation energy (E) and frequency factor (s) for TSL glow peak 165 °C were determined using different heating rate method. Thermally stimulated emission showed the presence of oxygen related defect centre.