Scintillation properties of transparent Lu{sub 3}Al{sub 5}O{sub 12} (LuAG) ceramics doped with different concentrations of Pr{sup 3+}

Energy Technology Data Exchange (ETDEWEB)

Yanagida, Takayuki; Fukabori, Akihiro; Fujimoto, Yutaka; Kamada, Kei; Yokota, Yuui; Yoshikawa, Akira; Chani, Valery [IMRAM, Tohoku University, 2-1-1 Katahira Aoba-ku, 980-8577 Sendai (Japan); Ikesue, Akio [World Labo, Co. Ltd., Mutsuno 2-4-1, Atsuta, 456-0023 Nagoya (Japan); Kataoka, Jun [School of Advanced Science and Engineering,Waseda University, Ohkubo 3-4-1, Shinjuku, 169-0072 Tokyo (Japan)

2011-01-15

Transparent ceramics of Pr-doped (0.2 mol%, 0.6 mol%, 1 mol%, and 2 mol%) Lu{sub 3}Al{sub 5}O{sub 12} (LuAG) scintillators produced by the sintering method are discussed. These materials were cut to the specimens with physical dimensions of 5 x 5 x 2 mm{sup 3}. Similar size specimens were also prepared from Czochralski grown Pr:LuAG single crystals to compare scintillation properties. Their transmittance and radio luminescence spectra were evaluated. All specimens were highly transparent in wavelength range above 300 nm, and intense Pr{sup 3+} 5d-4f emission was detected around 310 and 370 nm under excitation with X-ray. Under {sup 137}Cs {gamma}-ray is irradiation, 2 keV photo-absorption peaks were also clearly observed in each sample. The Pr 0.6 mol% doped LuAG ceramics demonstrated highest light yield achievable among the ceramics, and it was half of that observed in the single crystals. Under pulse X-ray excitation, the decay time constants became faster when Pr concentration increased, and. the fastest decay ({proportional_to}5.7 ns time constant) was noticed in the 2 mol% doped ceramic. (copyright 2011 WILEY-VCH Verlag GmbH and Co. KGaA, Weinheim) (orig.)

Study of the atomic dynamics of nanoclusters Y2SiO5:Pr3+ by the confocal fluorescent microscopy

International Nuclear Information System (INIS)

Malyukin, Yu.V.; Zhmurin, P.N.; Syrkin, E.S.; Feodosyev, S.B.; Mamalui, M.A.

2004-01-01

The system under consideration consists of a Pr 3+ ion placed into a nanodimensional Y 2 SiO 5 crystal (∝20 nm), which rests on a glass substrate. The spectrum and attenuation of the fluorescence of the Pr 3+ ion have been studied by the method of confocal fluorescent microscopy. The rapid electron relaxation in J-multiplets of rare earth impurity ions split by the crystal field (for a usual bulk crystal τ∝10 -9 -10 -12 sec) is shown to be suppressed in the nanodimensional crystal of Y 2 SiO 5 :Pr 3+ . For the excited Stark components of 1 D 2 multiplet, the electron relaxation appears to be more than 10 4 times suppressed, while an average splitting of the 1 D 2 multiplet by the crystal field of ligands is 200 cm -1 . The observed phenomena strongly depends on the interaction of the Y 2 SiO 5 :Pr 3+ cluster with the substrate and the surrounding ('matrix'). Experimental results and theoretical calculations show the noticeable changes in the structure of vibrational spectrum and the density of vibrational states of the nanodimensional Y 2 SiO 5 :Pr 3+ crystal. (copyright 2004 WILEY-VCH Verlag GmbH and Co. KGaA, Weinheim) (orig.)

14 CFR 95.3 - Symbols.

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2010-01-01

... 14 Aeronautics and Space 2 2010-01-01 2010-01-01 false Symbols. 95.3 Section 95.3 Aeronautics and Space FEDERAL AVIATION ADMINISTRATION, DEPARTMENT OF TRANSPORTATION (CONTINUED) AIR TRAFFIC AND GENERAL OPERATING RULES IFR ALTITUDES General § 95.3 Symbols. For the purposes of this part— (a) COP means...

75 FR 44847 - Proposed Collection; Comment Request for Forms 943, 943-PR, 943-A, and 943A-PR

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2010-07-29

... 943, 943-PR, 943- A, and 943A-PR AGENCY: Internal Revenue Service (IRS), Treasury. ACTION: Notice and... comments concerning Forms 943, Employer's Annual Tax Return for Agricultural Employees, 943-PR, Planilla..., Agricultural Employer's Record of Federal Tax Liability, and 943A-PR, Registro De La Obligacion Contributiva...

Cu4Pr6(MoO4)11-Pr2(MoO4)3 system

International Nuclear Information System (INIS)

Arzumanyan, G.A.

1982-01-01

Existence boundaries and Dalton compositions (CuPr(MoO 4 ) 2 , CuPr 3 (MoO 4 ) 5 ) of solid solutions that in the mojority are of shcheelite dsitored structure have been determined in the Cu 4 Pr 6 (MoO 4 ) 11 -Pr 2 (MoO 4 ) 3 system. It has been revealed that regions of homogeneity near the CuPr(MoO 4 ) 2 composition have a horseshoeshaped profile

Energy transfer in LaF3: R3+, Pr3+ (where R = Nd, Dy)

International Nuclear Information System (INIS)

Reddy, B.R.; Venkateswarlu, P.

1982-01-01

Fluorescence is observed for 1 D 2 levels of Pr 3+ on exciting the higher lying level 3 P 0 in doubly doped systems LaF 3 : R 3+ , Pr 3+ (R = Nd or Dy) but not in LaF 3 :Pr 3+ . From the recorded excitation spectra, and the measured decay times, it has been found that the drain mechanism of population to 1 D 2 levels is caused in doubly doped systems by ion-pair relaxation between Pr 3+ ( 3 P 0 -- 1 D 2 ) and Nd 3+ (Z-X) or Dy 3+ (Z-Y) ions

Photon cascade luminescence from Pr3+ ions in LiPrP4O12 polyphosphate

International Nuclear Information System (INIS)

Shalapska, T; Stryganyuk, G; Romanyshyn, Yu; Demchenko, P; Voloshinovskii, A; Trots, D; Gektin, A; Dorenbos, P

2010-01-01

The spectral-kinetic properties of luminescence from LiY 1-x Pr x P 4 O 12 (x = 1, 0.1) phosphors are studied in the 10-300 K temperature range upon excitation within the UV-VUV spectral range. The luminescence observed for LiPrP 4 O 12 at low temperatures is attributed to both intra-configurational 4f 2 → 4f 2 and inter-configurational 4f5d → 4f 2 radiative transitions of Pr 3+ . The temperature dependence of emission and the decay kinetics of Pr 3+ luminescence from LiY 1-x Pr x P 4 O 12 (x = 1, 0.1) phosphors are explained by temperature stimulated transitions from the 1 S 0 to the Pr 3+ 4f5d state. At low temperatures, the energy potential barrier between the 1 S 0 and 4f5d states is 0.014 eV for LiPrP 4 O 12 . The spectral overlap of the 1 S 0 and 4f5d states of Pr 3+ in LiY 0.9 Pr 0.1 P 4 O 12 determines the luminescence properties in the entire temperature range studied.

78 FR 47051 - Proposed Collection; Comment Request for Forms 943, 943-PR, 943-A, and 943A-PR

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2013-08-02

... 943, 943-PR, 943- A, and 943A-PR AGENCY: Internal Revenue Service (IRS), Treasury. ACTION: Notice and..., 943-PR, Planilla Para La Declarcion Anual De La Contribucion Federal Del Patrono De Empleados Agricolas, 943-A, Agricultural Employer's Record of Federal Tax Liability, and 943A-PR, Registro De La...

Thermoelectric power of PrMg3

Science.gov (United States)

Isikawa, Yosikazu; Somiya, Kazuya; Koyanagi, Huruto; Mizushima, Toshio; Kuwai, Tomohiko; Tayama, Takashi

2010-01-01

PrMg3 is supposed to be one of the strongly correlated electron systems originated from the hybridization between the Pr 4f and conduction electrons, because the gigantic electronic specific heat coefficient C/T was observed at low temperatures. However, a typical behaviour of - ln T dependence was not observed in the temperature dependence of the electrical resistivity. The thermoelectric power S is a powerful tool to investigate the density of states at the Fermi energy. We measured carefully the thermoelectric power of PrMg3 in the temperature range between 2 and 300 K. S is extremely small, ranged within ±1 μV/K over the whole temperature. The value of S/T at low temperature limit was also significantly smaller than expected from the specific heat results. We therefore conclude that the density of state at the Fermi level is not enhanced in PrMg3.

Thermoelectric power of PrMg3

International Nuclear Information System (INIS)

Isikawa, Yosikazu; Somiya, Kazuya; Koyanagi, Huruto; Mizushima, Toshio; Kuwai, Tomohiko; Tayama, Takashi

2010-01-01

PrMg 3 is supposed to be one of the strongly correlated electron systems originated from the hybridization between the Pr 4f and conduction electrons, because the gigantic electronic specific heat coefficient C/T was observed at low temperatures. However, a typical behaviour of - ln T dependence was not observed in the temperature dependence of the electrical resistivity. The thermoelectric power S is a powerful tool to investigate the density of states at the Fermi energy. We measured carefully the thermoelectric power of PrMg 3 in the temperature range between 2 and 300 K. S is extremely small, ranged within ±1 μV/K over the whole temperature. The value of S/T at low temperature limit was also significantly smaller than expected from the specific heat results. We therefore conclude that the density of state at the Fermi level is not enhanced in PrMg 3 .

Cathodoluminescence properties of SiO2:Pr3+and ZnO.SiO2:Pr3+ phosphor nanopowders

CSIR Research Space (South Africa)

Mhlongo, GH

2010-10-01

Full Text Available regardless of the incorporation of Pr3+ and nanocrystalline ZnO or annealing at 600 °C. The particles were mostly spherical and agglomerated as confirmed by Field Emission Scanning Electron Microscopy. Thermogravimetric analysis of dried gels performed... Science, vol. 45(19): 5228-5236 Cathodoluminescence properties of SiO2:Pr 3+and ZnO·SiO2:Pr 3+ phosphor nanopowders G. H. Mhlongo, O. M. Ntwaeaborwa, M. S. Dhlamini, H. C. Swart, K. T. Hillie ABSTRACT: The successful incorporation of Zn...

Ionic/Electronic Conductivity, Thermal/Chemical Expansion and Oxygen Permeation in Pr and Gd Co-Doped Ceria PrxGd0.1Ce0.9-xO1.95-δ

DEFF Research Database (Denmark)

Cheng, Shiyang; Chatzichristodoulou, Christodoulos; Søgaard, Martin

2017-01-01

Pr. A series of compositions of PrxGd0.1Ce0.9-xO1.95-δ (x = 0, 0.02, 0.05, 0.08, 0.15, 0.25, 0.3 and 0.4) was prepared by solid state reaction. X-ray powder diffraction (XPD) indicates that Pr is completely dissolved in the fluorite structure up to 40 at.%. Pronounced nonlinear thermal expansion...... behavior was observed as a function of temperature, due to the simultaneous contributions of both thermal and chemical expansion. The electronic and ionic conductivities were measured as a function of temperature and oxygen partial pressure. Within the range from 10 to 15 at.% Pr, a drastic drop...

75 FR 2165 - Puerto Rico Disaster No. PR-00007

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2010-01-14

... SMALL BUSINESS ADMINISTRATION [Disaster Declaration Nos. 12004 and 12005; Puerto Rico Disaster No. PR-00007] Puerto Rico Disaster No. PR-00007 AGENCY: U.S. Small Business Administration. ACTION: Notice. SUMMARY: This is a notice of an Administrative declaration of a disaster for the Commonwealth of...

Phase relations in the SiC-Al2O3-Pr2O3 system

International Nuclear Information System (INIS)

Pan, W.; Wu, L.; Jiang, Y.; Huang, Z.

2016-01-01

Phase relations in the Si-Al-Pr-O-C system, including the SiC-Al 2 O 3 -Pr 2 O 3 , the Al 2 O 3 -Pr 2 O 3 -SiO 2 and the SiC-Al 2 O 3 -Pr 2 O 3 -SiO 2 subsystems, were determined by means of XRD phase analysis of solid-state-reacted samples fabricated by using SiC, Al 2 O 3 , Pr 2 O 3 and SiO 2 powders as the starting materials. Subsolidus phase diagrams of the systems were presented. Two Pr-aluminates, namely PrAlO 3 (PrAP) and PrAl 11 O 18 (β(Pr) β-Al 2 O 3 type) were formed in the SiC-Al 2 O 3 -Pr 2 O 3 system. SiC was compatible with both of them. Pr-silicates of Pr 2 SiO 5 , Pr 2 Si 2 O 7 and Pr 9.33 Si 6 O 26 (H(Pr) apatite type) were formed owing to presence of SiO 2 impurity in the SiC powder. The presence of the SiO 2 extended the ternary system of SiC-Al 2 O 3 -Pr 2 O 3 into a quaternary system of SiC-Al 2 O 3 -SiO 2 -Pr 2 O 3 (Si-Al-Pr-O-C). SiC was compatible with Al 2 O 3 , Pr 2 O 3 and the Pr-silicates. The effect of SiO 2 on the phase relations and liquid phase sintering of SiC ceramics was discussed.

Pathogenesis of PR3-ANCA associated vasculitis

NARCIS (Netherlands)

Kallenberg, C. G. M.

2008-01-01

Wegener's Granulomatosis (WG) is closely associated with antineutrophil cytoplasmic autoantibodies (ANCA), particularly those directed to proteinase 3 (PR3). ANCA directed to myeloperoxidase (MPO) are associated with microscopic polyangiitis (MPA) and the Churg Strauss syndrome. PR3-ANCA associated

75 FR 65010 - Notice of Baseline Filings

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2010-10-21

... DEPARTMENT OF ENERGY Federal Energy Regulatory Commission [Docket No. PR11-1-000; Docket No. PR11-2-000; Docket No. PR11-3-000] Notice of Baseline Filings October 14, 2010. Cranberry Pipeline Docket..., 2010, respectively the applicants listed above submitted their baseline filing of its Statement of...

Downconversion in Pr3+–Yb3+ co-doped ZBLA fluoride glasses

International Nuclear Information System (INIS)

Maalej, O.; Boulard, B.; Dieudonné, B.; Ferrari, M.; Dammak, M.; Dammak, M.

2015-01-01

Fluorozirconate ZBLA glasses with molar composition 57ZrF 4 –34BaF 2 –5LaF 3 –4AlF 3 –0.5PrF 3 –xYbF 3 (from x=0 to 10) were synthesized to evaluate the rate of the conversion of visible photons into infrared photons. The emission spectra in the near infrared (NIR) at 950–1100 nm and the luminescence decays in the visible and NIR indicate an energy transfer from Pr 3+ to Yb 3+ upon blue excitation of Pr 3+ at 440 nm. The energy transfer efficiency increases with Yb 3+ concentration to reach 86% with 0.5Pr 3+ –10Yb 3+ co-doping (in mol%). However, the quenching of the Yb 3+ emission strongly reduces the efficiency of the downconversion process: the decay time values decrease from 600 µs (x=0.5 mol%) to 85 µs (x=10 mol%). - Highlights: • We synthesized 0.5Pr 3+ –xYb 3+ co-doped ZBLA glasses (from x=0 to 10 mol %). • Photoluminescence of Yb 3+ was observed at 980 nm under blue excitation. • Time resolved measurements have been performed in the visible and near infrared. • Energy transfer efficiency from Pr 3+ to Yb 3+ reaches 86% in 0.5 Pr 3+ –10Yb 3+ glass

Major enhancement of the thermoelectric performance in Pr/Nb-doped SrTiO3 under strain

KAUST Repository

Amin, B.; Alshareef, Husam N.; Schwingenschlö gl, Udo; Singh, Nirpendra; Tritt, T. M.

2013-01-01

site generate n-type doping and thus improve the thermoelectric performance as compared to pristine SrTiO3. Further enhancement is achieved by the application of strain, for example, of the Seebeck coefficient by 21% for Sr0.95Pr0.05TiO3 and 10% for Sr

Synthesis and thermoluminescence of LaAlO3:Pr3+ to UVC radiation dosimetry

International Nuclear Information System (INIS)

Morales-Hernández, A.; Zarate-Medina, J.; Contreras-García, M.E.; Azorín-Nieto, J.; Rivera-Montalvo, T.

2016-01-01

Thermoluminescent (TL) response of trivalent praseodymium ion doped lanthanum aluminate (LaAlO 3 :Pr 3+ ) obtained by Pechini method and Spray Dryer was studied. TL response of LaAlO 3 :Pr 3+ powders submitted at 1600 °C exhibited one peak centered at 157 °C. Sensitivity of LaAlO 3 :Pr 3+ was improved in around 90 times compared with undoped LaAlO 3 . TL response as a function of wavelength showed a maximum in 230 nm. Dosimetric characteristics of LaAlO 3 :Pr 3+ under UVR radiation effects were analyzed. Evaluation of activation energy was obtained by Glow Fit v.1.3 software. Experimental results about thermoluminescent characteristics of LaAlO 3 :Pr 3+ suggest as good candidate to be employed as a complementary thermoluminescent device with other TL phosphors as aluminum oxide - Highlights: • High sensitivity of new phosphor to UVC dosimetry was is studied. • Thermoluminescence response of LaAlO 3 :Pr 3+ is presented. • LaAlO 3 :Pr 3+ is suggested as UVCR dosimeter. • TL response of LaAlO 3 :Pr 3+ has dependence on sintering temperature.

75 FR 51531 - Proposed Collection; Comment Request for Forms 941, 941-PR, 941-SS, 941-X, 941-X(PR), Schedule B...

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2010-08-20

... 941, 941-PR, 941- SS, 941-X, 941-X(PR), Schedule B (Form 941), Schedule R (Form 941) and Schedule B (Form 941-PR) AGENCY: Internal Revenue Service (IRS), Treasury. ACTION: Notice and request for comments... comments concerning Forms 941 (Employer's Quarterly Federal Tax Return), 941-PR (Planilla Para La...

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2013-08-02

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22 CFR 95.3 - Procedures.

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2010-04-01

... 22 Foreign Relations 1 2010-04-01 2010-04-01 false Procedures. 95.3 Section 95.3 Foreign Relations... torture are made or the issue is otherwise brought to the Department's attention, appropriate policy and... Secretary as to whether or not to sign the surrender warrant. (b) Based on the resulting analysis of...

Instability of Yb3+ and Pr3+ low-symmetry luminescence centers in gallium phosphide

International Nuclear Information System (INIS)

Kasatkin, V.A.

1985-01-01

The stability of γb 3+ and Pr 3+ low-symmetry luminescence centers formed in gallium phosphide during quenching were studied in the process of durable storage and annealing. Observation of the Yb 3+ and Pr 3+ centrer states was accomplished by the photoluminescence spectra at 18 K. It has been established that annealing in the dark under normal conditions results in a reduced integral luminescence intensity of all low-symmetry Yb 3+ and Pr 3+ centers. Annealing of quenched GaP and GaP saples at 400 K results in complete disappearance of intracenter luminescence of Pr 3+ and low-symmetry Yb 3+ centers. Decomposition during storage and low anealing temperature point to the instability of low-symmetry centers of Pr 3+ and Yb 3+ luminescence

77 FR 37445 - Notice of Permit Modification Received Under the Antarctic Conservation Act of 1978 (Pub. L. 95-541)

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2012-06-21

... Conservation Act of 1978 (Pub. L. 95-541) AGENCY: National Science Foundation. ACTION: Notice of Permit... directed by the Antarctic Conservation Act of 1978 (Pub. L. 95-541), as amended by the Antarctic Science... feathers removed to confirm gender of the penguin, and have GPS/TDR tags attached and later removed. The...

Pr{sup 3+1}S{sub 0}->Cr{sup 3+} energy transfer and ESR investigation in Pr{sup 3+} and Cr{sup 3+} activated SrAl{sub 12}O{sub 19} quantum cutting phosphor

Energy Technology Data Exchange (ETDEWEB)

Nie Zhaogang [BK21 Physics Program and Department of Physics, Chungbuk National University, Cheongju 361-763 (Korea, Republic of); Lim, Ki-Soo, E-mail: kslim@chungbuk.ac.k [BK21 Physics Program and Department of Physics, Chungbuk National University, Cheongju 361-763 (Korea, Republic of); Zhang Jiahua [Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033 (China); Wang Xiaojun [Department of Physics, Georgia Southern University, Statesboro, GA 30460 (United States)

2009-08-15

With the help of the Dexter's theory, the energy transfer mechanism from Pr{sup 3+1}S{sub 0} to Cr{sup 3+} is investigated theoretically in SrAl{sub 12}O{sub 19}:Pr{sup 3+}, Cr{sup 3+} quantum cutting phosphors. The electron spin resonance (ESR) spectra of Pr{sup 3+} and Cr{sup 3+}-doped SrAl{sub 12}O{sub 19} with magnetoplumbite structure have been studied. The Cr{sup 3+} ion is found to enter the Al4(4f) site, which is very close to the Sr(2d) site replaced by the Pr{sup 3+} ions in the host. The theoretical results indicate that the efficient Pr{sup 3+1}S{sub 0}->Cr{sup 3+} energy transfer can only take place in the intermediate mirror planes, in which for the nearest and next-nearest Pr{sup 3+}-Cr{sup 3+} pairs, both dipole-dipole and dipole-quadrupole interactions can play their parts in the transfer. Finally, an overview is given about the research on the energy transfer from Pr{sup 3+1}S{sub 0} to codopants in their co-doped materials.

75 FR 68393 - Puerto Rico Disaster # PR-00011

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2010-11-05

... SMALL BUSINESS ADMINISTRATION [Disaster Declaration 12366 and 12367] Puerto Rico Disaster PR-00011 AGENCY: U.S. Small Business Administration. ACTION: Notice. SUMMARY: This is a notice of an Administrative declaration of a disaster [[Page 68394

75 FR 42436 - Houston Pipe Line Company LP-Bammel Storage, Docket No. PR10-51-000, et. al.; Notice of Baseline...

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2010-07-21

... DEPARTMENT OF ENERGY Federal Energy Regulatory Commission Houston Pipe Line Company LP--Bammel Storage, Docket No. PR10-51- 000, et. al.; Notice of Baseline Filings July 14, 2010. Houston Pipe Line..., 2010, respectively the applicants listed above submitted their baseline filing of its Statement of...

46 CFR 111.95-3 - General requirements.

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2010-10-01

... 46 Shipping 4 2010-10-01 2010-10-01 false General requirements. 111.95-3 Section 111.95-3 Shipping COAST GUARD, DEPARTMENT OF HOMELAND SECURITY (CONTINUED) ELECTRICAL ENGINEERING ELECTRIC SYSTEMS-GENERAL REQUIREMENTS Electric Power-Operated Boat Winches § 111.95-3 General requirements. (a) Each electrical...

Selective recognition of Pr3+ based on fluorescence enhancement sensor

International Nuclear Information System (INIS)

Ganjali, M.R.; Hosseini, M.; Ghafarloo, A.; Khoobi, M.; Faridbod, F.; Shafiee, A.; Norouzi, P.

2013-01-01

(E)-2-(1-(4-hydroxy-2-oxo-2H-chromen-3-yl)ethylidene) hydrazinecarbothioamide (L) has been used to detect trace amounts of praseodymium ion in acetonitrile–water solution (MeCN/H 2 O) by fluorescence spectroscopy. The fluorescent probe undergoes fluorescent emission intensity enhancement upon binding to Pr 3+ ions in MeCN/H 2 O (9/1:v/v) solution. The fluorescence enhancement of L is attributed to a 1:1 complex formation between L and Pr 3+ , which has been utilized as the basis for selective detection of Pr 3+ . The sensor can be applied to the quantification of praseodymium ion with a linear range of 1.6 × 10 −7 to 1.0 × 10 −5 M. The limit of detection was 8.3 × 10 −8 M. The sensor exhibits high selectivity toward praseodymium ions in comparison with common metal ions. The proposed fluorescent sensor was successfully used for determination of Pr 3+ in water samples. - Highlights: • A new fluorescent sensor is introduced as a selective probe for Pr 3+ detection. • Fluorescent intensity of the chemical probe enhances upon binding to Pr 3+ ion. • The sensor can be used for Pr 3+ determination in the range of 1.6 × 10 −7 –1.0 × 10 −5 M

Energy Transfer between Er3+ and Pr3+ for 2.7 μm Fiber Laser Material

Directory of Open Access Journals (Sweden)

Xiangtan Li

2014-01-01

Full Text Available Energy transfer mechanisms between Er3+ and Pr3+ in Er3+/Pr3+ codoped germinate glass are investigated in detail. Under 980 nm LD pumping, 2.7 μm fluorescence intensity enhanced greatly. Meanwhile, 1.5 μm lifetime and fluorescence were suppressed deeply due to the efficient energy transfer from Er3+:4I13/2 to Pr3+:3F3,4, which depopulates the 4I13/2 level and promotes the 2.7 μm transition effectively. The obvious change in J-O parameters indicates that Pr3+ influences the local environment of Er3+ significantly. The increased spontaneous radiative probability in Er3+/Pr3+ glass is further evidence for enhanced 4I11/2 → 4I13/2 transition. The Er3+:4I11/2→Pr3+:1G4 process is harmful to the population accumulation on 4I11/2 level, which inhibits the 2.7 μm emission. The microscopic energy transfer coefficient of Er3+:4I13/2→Pr3+:3F3,4 is 42.25 × 10−40 cm6/s, which is 11.5 times larger than that of Er3+:4I11/2→Pr3+:1G4. Both processes prefer to be non-phonon assisted, which is the main reason why Pr3+ is so efficient in Er3+:2.7 μm emission.

Eff icient energy back transfer from Ce{sup 3+} 5d state to Pr{sup 3+} {sup 1}D{sub 2} level in Lu{sub 3}Al{sub 5}O{sub 12} upon Pr{sup 3+} 4f5d excitation

Energy Technology Data Exchange (ETDEWEB)

Dan Wu [State Key Laboratory of Luminescence and Applications, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033, Jilin (China); University of Chinese Academy of Sciences, Beijing 100049 (China); Hao, Zhendong; Zhang, Xia; Pan, Guo-Hui; Luo, Yongshi; Zhang, Ligong; Zhao, Haifeng [State Key Laboratory of Luminescence and Applications, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033, Jilin (China); Zhang, Jiahua, E-mail: zhangjh@ciomp.ac.cn [State Key Laboratory of Luminescence and Applications, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033, Jilin (China)

2017-06-15

The step energy transfers from Pr{sup 3+} 4f5d state to Ce{sup 3+} 5d state followed by energy back transfer from Ce{sup 3+} 5d state to Pr{sup 3+} {sup 1}D{sub 2} level are studied. The Ce{sup 3+}→Pr{sup 3+} energy back transfer upon Pr{sup 3+} 4f5d excitation is found to be more efficient than the normal Ce{sup 3+}→Pr{sup 3+} energy transfer upon Ce{sup 3+} 5d excitation. The efficient energy back transfer is attributed to preferential excitation of the Ce{sup 3+} ion with an adjacent Pr{sup 3+} surrounding in Pr{sup 3+}→Ce{sup 3+} energy transfer of the first step, whereas Ce{sup 3+} is excited randomly in the normal energy transfer. The efficiencies of Ce{sup 3+}→Pr{sup 3+} energy back transfer as a function of Ce{sup 3+} and Pr{sup 3+} concentration are evaluated, respectively.

Role of Gd{sup 3+} ion on downshifting and upconversion emission properties of Pr{sup 3+}, Yb{sup 3+} co-doped YNbO{sub 4} phosphor and sensitization effect of Bi{sup 3+} ion

Energy Technology Data Exchange (ETDEWEB)

Dwivedi, A.; Rai, S. B., E-mail: sbrai49@yahoo.co.in [Department of Physics, Banaras Hindu University, Varanasi 221005 (India); Mishra, Kavita [Department of Physics, University of Lucknow, Lucknow 226007 (India)

2016-07-28

concentration of Pr{sup 3+} and Bi{sup 3+} ions, and the results are explained by the well-known simple band structure model. The study of Gd{sup 3+} co-doping reveals noticeable differences in DS characteristics of Y{sub 1−x}Pr{sub x}NbO{sub 4} phosphors: the overall decrement and increment (except for 612 nm emission) in intensity of DS emission on excitation with λ{sub ex} = 264 nm and 491 nm, respectively. These observations have been thoroughly explained, and the {sup 1}D{sub 2}→{sup 3}H{sub 4} transition (612 nm) of Pr{sup 3+} ion is found to be strongly dependent on surrounding environment of the host matrix. The UC properties of Y{sub 0.95−x}Pr{sub x}Yb{sub 0.05}NbO{sub 4} phosphors have been explored using Near Infra-Red (NIR) excitation. The material gives intense green and relatively weak blue and red UC emissions with λ{sub ex} = 980 nm. Interestingly, the UC emission intensity is further enhanced in the case of Y{sub 0.949−x}Pr{sub 0.001}Yb{sub 0.05}Gd{sub x}NbO{sub 4} phosphors. In addition, the less explored laser induced heating effect with the pump power as well as the irradiation time on the UC emission has been explored in Y{sub 0.949−x}Pr{sub 0.001}Yb{sub 0.05}Gd{sub x}NbO{sub 4} (x = 0, 0.5, and 0.949) phosphor samples, and subsequently, this feature has been found to be superior for Gd{sub 0.949}Pr{sub 0.001}Yb{sub 0.05}NbO{sub 4} phosphor. The comparative study between the two hosts, viz., YNbO{sub 4} and GdNbO{sub 4} shows that GdNbO{sub 4} is better than YNbO{sub 4} for UC emission behavior; however, a reverse is observed as for as DS behavior is concerned only for the particular excitation wavelength (λ{sub ex} = 264 nm).

Sol–gel synthesis and photoluminescence of CaTi1–x Zrx O3: Pr 3 ...

Indian Academy of Sciences (India)

The strongest red excitation obtained from CaTi1–ZrO3 : Pr3+ ( = 4/300) and CaTi1–ZrO3 : Pr3+ ( = 5/300) possesses the strongest emission at 610 nm, similar to the intensities of Ca(Ti1–Zr)O3 : Pr3+ ( = 3/300, 4/300, 6/300), which may be corresponded to the cell parameters of CaTi1–ZrO3 : Pr3+.

Growth by the μ-PD Method and Visible Laser Operation of a Single-Crystal Fiber of Pr3+:KY3F10

Directory of Open Access Journals (Sweden)

Jun Shu

2017-07-01

Full Text Available We report on the first growth, spectroscopy, and visible laser operation of a single-crystal fiber (SCF of KY3F10 (KYF grown by the micro-pulling-down (μ-PD method, doped with Pr3+ ions. This material has a cubic lattice, which makes it appealing for use in the industry. However, KYF crystals are considered difficult to grow with high optical quality, even with well-established methods. Nevertheless, we grew a 50-mm-long SCF of Pr:KYF, which was transparent in its inner part. We studied the spectroscopic features of it in comparison with existing literature and with samples of the same crystal grown by the Czochralski method, and we did not notice any large differences. These characterizations confirmed that is indeed possible to grow high-quality crystals of Pr:KYF by the μ-PD method. Unfortunately, the crystal proved to be more brittle than typical KYF and especially difficult to polish, leading to rough and irregular facets, as evidenced by transmission measurements. Despite these issues, we obtained continuous-wave laser operation in the orange, red, and deep red regions, using a sample carved from the SCF as active medium and an InGaN-based laser diode as pump source, though with lower performances than in existing reports on this crystal.

78 FR 3920 - Notice of Permit Applications Received; Under the Antarctic Conservation Act of 1978 (Pub. L. 95...

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2013-01-17

... Conservation Act of 1978 (Pub. L. 95-541) AGENCY: National Science Foundation. ACTION: Notice of Permit... explore for, discover, and collect vertebrate fossils (primarily those of fishes, marine reptiles, non... be shed on the evolution, faunal dynamics, and/or paleobiogeography of such important vertebrate...

Oscillatory exchange bias and training effects in nanocrystalline Pr0.5Ca0.5MnO3

Directory of Open Access Journals (Sweden)

S. Narayana Jammalamadaka

2012-03-01

Full Text Available We report on exchange bias effects in 10 nm particles of Pr0.5Ca0.5MnO3 which appear as a result of competing interactions between the ferromagnetic (FM/anti-ferromagnetic (AFM phases. The fascinating new observation is the demonstration of the temperature dependence of oscillatory exchange bias (OEB and is tunable as a function of cooling field strength below the SG phase, may be attributable to the presence of charge/spin density wave (CDW/SDW in the AFM core of PCMO10. The pronounced training effect is noticed at 5 K from the variation of the EB field as a function of number of field cycles (n upon the field cooling (FC process. For n > 1, power-law behavior describes the experimental data well; however, the breakdown of spin configuration model is noticed at n ≥ 1.

Electrocardiographic PR-interval duration and cardiovascular risk

DEFF Research Database (Denmark)

Rasmussen, Peter Vibe; Nielsen, Jonas Bille; Skov, Morten Wagner

2017-01-01

Background Because of ambiguous reports in the literature, we aimed to investigate the association between PR interval and the risk of all-cause and cardiovascular death, heart failure, and pacemaker implantation, allowing for a nonlinear relationship. MethodsWe included 293,111 individuals...... into 7 groups based on the population PR interval distribution. Cox models were used, with reference to a PR interval between 152 and 161 ms (40th to heart failure...... adjustment. A long PR interval conferred an increased risk of heart failure ( > 200 ms; HR, 1.31; 95% CI, 1.22-1.42; P 200 ms (HR, 3...

Energy transfer of the quantum-cutter couple Pr{sup 3+}–Mn{sup 2+} in CaF{sub 2}:Pr{sup 3+}, Mn{sup 2+} nanoparticles

Energy Technology Data Exchange (ETDEWEB)

Kuzmanoski, Ana [Karlsruhe Institute of Technology (KIT), Institute of Inorganic Chemistry, Engesserstraße 15, D-76131 Karlsruhe (Germany); Pankratov, Vladimir, E-mail: vpank@latnet.lv [Research Center of Molecular Materials, University of Oulu, PO Box 3000, 90014 Oulu (Finland); Feldmann, Claus, E-mail: claus.feldmann@kit.edu [Karlsruhe Institute of Technology (KIT), Institute of Inorganic Chemistry, Engesserstraße 15, D-76131 Karlsruhe (Germany)

2016-11-15

CaF{sub 2}:Pr (1 mol%), CaF{sub 2}:Mn (5 mol%) and CaF{sub 2}:Pr,Mn (1 mol%, 5 mol%) nanoparticles are prepared via a microwave-mediated synthesis in ionic liquids. The nanoparticles are highly crystalline and exhibit particle diameters <50 nm.In contrast to bulk-CaF{sub 2}:Pr,Mn,energy transfer between Pr{sup 3+}and Mn{sup 2+}under {sup 1}S{sub 0}→{sup 1}I{sub 6} relaxation on Pr{sup 3+} and {sup 4}G({sup 4}T{sub 1g})→{sup 6}S(A{sub 1g}) emission of Mn{sup 2+} is observed for the first time. Such energy transfer represents the essential first step of the quantum-cutting cascade via the Pr{sup 3+}–Mn{sup 2+} couple, which is most interesting as both expected photons – {sup 3}P{sub 0}→{sup 3}H{sub 4} emission of Pr{sup 3+}and {sup 4}G({sup 4}T{sub 1g})→{sup 6}S(A{sub 1g}) emission of Mn{sup 2+} – are emitted in the green spectral range. While bulk crystals were said not to show energy transfer due to prohibiting selection rules, vacuum ultraviolet (VUV) spectroscopy of CaF{sub 2}:Pr, Mn nanoparticles firstly proves efficient Pr{sup 3+}→Mn{sup 2+} energy transfer, which can be ascribed to the reduced site symmetry and considerable spin–orbit interaction in the nanocrystals.

78 FR 3495 - Puerto Rico Disaster #PR-00017

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2013-01-16

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2010-08-19

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2013-01-23

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Rats and mice immunised with chimeric human/mouse proteinase 3 produce autoantibodies to mouse Pr3 and rat granulocytes

NARCIS (Netherlands)

van der Geld, Ymke M.; Hellmark, Thomas; Selga, Daina; Heeringa, Peter; Huitema, Minke G.; Limburg, Pieter C.; Kallenberg, Cees G. M.

2007-01-01

Aim: In this study, we employed chimeric human/ mouse Proteinase 3 ( PR3) proteins as tools to induce an autoantibody response to PR3 in rats and mice. Method: Rats and mice were immunised with recombinant human PR3 ( HPR3), recombinant murine PR3 ( mPR3), single chimeric human/ mouse PR3 ( HHm,

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2010-07-07

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2011-09-06

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2010-11-05

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2011-09-06

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2011-07-26

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2011-10-27

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2010-10-13

... requiring special protection. The regulations establish such a permit system to designate Antarctic... NATIONAL SCIENCE FOUNDATION Notice of Permit Applications Received Under the Antarctic... Applications Received under the Antarctic Conservation Act of 1978, Public Law 95-541. SUMMARY: The National...

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2011-08-22

... requiring special protection. The regulations establish such a permit system to designate Antarctic... NATIONAL SCIENCE FOUNDATION Notice of Permit Applications Received Under the Antarctic... Applications Received under the Antarctic Conservation Act of 1978, Public Law 95-541. SUMMARY: The National...

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2012-09-12

... protection. The regulations establish such a permit system to designate Antarctic Specially Protected Areas... NATIONAL SCIENCE FOUNDATION Notice of Permit Applications Received Under the Antarctic... Applications Received under the Antarctic Conservation Act of 1978, Public Law 95-541. SUMMARY: The National...

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2010-10-05

... protection. The regulations establish such a permit system to designate Antarctic Specially Protected Areas... NATIONAL SCIENCE FOUNDATION Notice of Permit Applications Received Under the Antarctic... Applications Received under the Antarctic Conservation Act of 1978, Public Law 95-541. SUMMARY: The National...

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2010-10-01

... protection. The regulations establish such a permit system to designate Antarctic Specially Protected Areas... NATIONAL SCIENCE FOUNDATION Notice of Permit Applications Received Under the Antarctic... Applications Received under the Antarctic Conservation Act of 1978, Public Law 95-541. SUMMARY: The National...

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2011-09-19

... protection. The regulations establish such a permit system to designate Antarctic Specially Protected Areas... NATIONAL SCIENCE FOUNDATION Notice of Permit Applications Received Under the Antarctic... Applications Received under the Antarctic Conservation Act of 1978, Public Law 95-541. SUMMARY: The National...

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2010-12-03

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2012-05-24

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2010-02-08

... protection. The regulations establish such a permit system to designate Antarctic Specially Protected Areas... NATIONAL SCIENCE FOUNDATION Notice of Permit Applications Received Under the Antarctic... Applications Received Under the Antarctic Conservation Act of 1978, Public Law 95-541. SUMMARY: The National...

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2011-09-22

... requiring special protection. The regulations establish such a permit system to designate Antarctic... NATIONAL SCIENCE FOUNDATION Notice of Permit Applications Received Under the Antarctic... Applications Received under the Antarctic Conservation Act of 1978, Public Law 95-541. SUMMARY: The National...

The influence of Pr3+ co-doping on the photoluminescence and cathodoluminescence properties of SiO2:Eu3+/Tb3+

CSIR Research Space (South Africa)

Mhlongo, GH

2011-07-01

Full Text Available Tb3+-Pr3+, and Eu3+-Pr3+ ion pairs co-doped in a SiO2 matrix were prepared by a sol-gel method. Co-doping of Eu3+ and Tb3+ ions with Pr3+ in SiO2 resulted in the quenching of Eu3+ and Tb3+ emissions with increasing Pr3+ concentrations. The quenching...

Satellite line mapping in Eu3+–Ce3+ and Pr3+–Ce3+ codoped Y2SiO5

International Nuclear Information System (INIS)

Serrano, D.; Karlsson, J.; Zheng, L.; Dong, Y.; Ferrier, A.; Goldner, P.; Walther, A.; Rippe, L.; Kröll, S.

2016-01-01

In this work we perform a high-resolution spectroscopic investigation of Eu 3+ –Ce 3+ and Pr 3+ –Ce 3+ codoped Y 2 SiO 5 crystals. Satellite line spectra were recorded at low temperatures around the Eu 3+ : 7 F 0 → 5 D 0 and the Pr 3+ : 3 H 4 → 1 D 2 transitions. It is observed that the incorporation of Ce 3+ as a codopant notably changes the Eu 3+ and Pr 3+ satellite line patterns. Satellite lines measured in singly doped Eu 3+ :Y 2 SiO 5 were found at the same spectral positions in Eu 3+ –Ce 3+ codoped crystals. These coincident lines were concluded to be due to pairs of Eu 3+ ions. Extra satellite lines appeared in the codoped crystals, which were assigned to Ce 3+ related structures such as Ce 3+ –Eu 3+ pairs. The analysis of the Pr 3+ satellite line spectra presents further challenges. Satellite lines associated to Pr 3+ pairs show weaker intensity, presumably due to the efficient quenching of the Pr 3+1 D 2 emission through cross-relaxation paths ( 1 D 2 → 1 G 4 ; 3 H 4 → 3 F 4 ). The investigation of the Eu 3+ and Pr 3+ satellite line patterns in Y 2 SiO 5 is particularly interesting for their exploitation in rare-earth based quantum computation schemes. - Highlights: • We recorded Eu and Pr satellite lines in Y 2 SiO 5 with and without Ce as a codopant. • The presence of Ce leads to the appearance of extra satellite lines in the spectra. • The satellite lines are associated to minor crystal sites such as ion pairs. • Less than 100 ion pairs were detected per satellite line. • The exploitation of the satellite line structure is proposed for quantum computing.

The thermodynamic characteristics of vaporization in the NaI-PrI3 system

Science.gov (United States)

Motalov, V. B.; Kudin, L. S.; Markus, T.

2009-05-01

The vaporization of the NaI-PrI3 quasi-binary system was studied by high-temperature mass spectrometry over the whole concentration range. At 623-994 K, saturated vapor contained not only (NaI) n and (PrI3) n molecules ( n = 1, 2) and Na+(NaI) n ( n = 0-4) and I-(PrI3) n ( n = 1-2) ions but also mixed molecular and ionic associates recorded for the first time (NaPrI4, Na2PrI5, NaPrI{3/+}, Na2PrI{4/+}, Na3PrI{5/+}, Na4PrI{6/+}, NaPrI{5/-}, and NaPr2I{8/-}). The partial vapor pressures of molecules were calculated, and the equilibrium constants of the dissociation of neutral and charged associates were measured. The enthalpies of molecular and ion-molecular reactions were determined, and the enthalpies of formation of gaseous molecules and ions were obtained.

78 FR 54685 - Notice of Permit Applications Received Under the Antarctic Conservation Act of 1978 (Pub. L. 95-541)

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2013-09-05

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2013-08-22

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78 FR 56247 - Notice of Permit Applications Received Under the Antarctic Conservation Act of 1978 (Pub. L. 95-541)

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2013-09-12

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78 FR 13662 - Cobra Pipeline Ltd.; Notice of Petition

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2013-02-28

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75 FR 27772 - Corning Natural Gas Corporation; Notice of Compliance Filing

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2010-05-18

... DEPARTMENT OF ENERGY Federal Energy Regulatory Commission [Docket No. PR09-30-002] Corning Natural Gas Corporation; Notice of Compliance Filing May 11, 2010. Take notice that on May 3, 2010, Corning Natural Gas Corporation, (Corning) filed its Statement of section 311 Operating Conditions in compliance...

29 CFR 4245.3 - Notice of insolvency.

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2010-07-01

... 29 Labor 9 2010-07-01 2010-07-01 false Notice of insolvency. 4245.3 Section 4245.3 Labor Regulations Relating to Labor (Continued) PENSION BENEFIT GUARANTY CORPORATION INSOLVENCY, REORGANIZATION, TERMINATION, AND OTHER RULES APPLICABLE TO MULTIEMPLOYER PLANS NOTICE OF INSOLVENCY § 4245.3 Notice of...

Liquid-vapor equilibrium in LaCl3-LuCl3 and PrCl3-NdCl3 systems

International Nuclear Information System (INIS)

Nisel'son, L.A.; Lyzlov, Yu.N.; Solov'ev, S.I.

1978-01-01

The liquid-vapour equilibrium in the systems LaCl 3 -LuCl 3 and PrCl 3 -NdCl 3 was studied by the boiling-point method. It was established that the system LaCl 3 -LuCl 3 is near-ideal. In the PrCl 3 -NdCl 3 system, a considerable positive deviation from the ideal with the formation of an azeotrope was detected. The azeotrope has a ''smeared-out'' minimum, which falls on a mixture containing approximately 65 mol.% neodymium trichloride. The boiling point of this mixture at a pressure of 1 mm Hg is approximately 975 deg C. The relative volatility coefficients in both systems were studied by the Raleigh distillation method. The presence of the azeotrope in the system PrCl 3 -NdCl 3 is confirmed by the nature of the dependence of the relative volatility coefficient on the composition of the mixture

Spectroscopic properties of Pr{sup 3+} ions embedded in lithium borate glasses

Energy Technology Data Exchange (ETDEWEB)

Ramteke, D.D. [Department of Applied Physics, Visvesvaraya National Institute of Technology, Nagpur 440010 (India); Department of Physics, University of the Free State, P.O. Box 339, Bloemfontein 9300 (South Africa); Swart, H.C., E-mail: swarthc@ufs.ac.za [Department of Physics, University of the Free State, P.O. Box 339, Bloemfontein 9300 (South Africa); Gedam, R.S., E-mail: rupesh_gedam@rediffmail.com [Department of Applied Physics, Visvesvaraya National Institute of Technology, Nagpur 440010 (India)

2016-01-01

A series of lithium borate glasses with different Pr{sup 3+} contents were prepared by the melt quench technique to explore the new material for solid state light applications. We found that the addition of Pr{sup 3+} ions in the glass matrix has a profound effect on the properties of the glasses. The presence of Pr{sup 3+} ions in the glass matrix created various absorption bands compared to the base glass. These bands were due to the ground state ({sup 3}H{sub 4}) of the Pr{sup 3+} to the various excited states. Optical energy band gap was calculated by Tauc's method which showed a decreasing trend with an increase in the Pr{sup 3+} content. This might be due to structural changes when the glass structure became rigid due to the Pr{sup 3+} ions and this was confirmed by the density results. Rigidity of the glass structure was further confirmed by the Fourier transformed infrared results. The excitation spectra showed bands at {sup 3}H{sub 4}→{sup 3}P{sub 2}, {sup 3}P{sub 1} and {sup 3}P{sub 0} nm. The {sup 3}H{sub 4}→{sup 3}P{sub 2} band was used to study the unresolved {sup 1}D{sub 2}→{sup 3}H{sub 4} and {sup 3}P{sub 0}→{sup 3}H{sub 6} transitions of the Pr{sup 3+} ions.

Evaluation of critical distances for energy transfer between Pr{sup 3+} and Ce{sup 3+} in yttrium aluminium garnet

Energy Technology Data Exchange (ETDEWEB)

Zeng, Peng; Wei, Xiantao; Yin, Min; Chen, Yonghu, E-mail: yhuchen@ustc.edu.cn [Key Laboratory of Strongly-Coupled Quantum Matter Physics, Chinese Academy of Sciences, School of Physical Sciences, University of Science and Technology of China, No. 96 Jinzhai Road, Hefei, Anhui 230026 (China); Zhou, Shaoshuai [Key Laboratory of Strongly-Coupled Quantum Matter Physics, Chinese Academy of Sciences, School of Physical Sciences, University of Science and Technology of China, No. 96 Jinzhai Road, Hefei, Anhui 230026 (China); Department of Physics, Qufu Normal University, Qufu, Shandong 273165 (China)

2016-09-07

A series of Pr{sup 3+}/Ce{sup 3+} doped yttrium aluminium garnet (Y{sub 3}Al{sub 5}O{sub 12} or simply YAG) phosphors were synthesized to investigate the energy transfer between Pr{sup 3+} and Ce{sup 3+} for their potential application in a white light-emitting diode and quantum information storage and processing. The excitation and emission spectra of YAG:Pr{sup 3+}/Ce{sup 3+} were measured and analyzed, and it revealed that the reabsorption between Pr{sup 3+} and Ce{sup 3+} was so weak that it can be ignored, and the energy transfer from Pr{sup 3+} (5d) to Ce{sup 3+} (5d) and Ce{sup 3+} (5d) to Pr{sup 3+} ({sup 1}D{sub 2}) did occur. By analyzing the excitation and the emission spectra, the energy transfer from Pr{sup 3+} (5d) to Ce{sup 3+} (5d) and Ce{sup 3+} (5d) to Pr{sup 3+} ({sup 1}D{sub 2}) was examined in detail with an original strategy deduced from fluorescence dynamics and the Dexter energy transfer theory, and the critical distances of energy transfer were derived to be 7.9 Å and 4.0 Å for Pr{sup 3+} (5d) to Ce{sup 3+} (5d) and Ce{sup 3+} (5d) to Pr{sup 3+} ({sup 1}D{sub 2}), respectively. The energy transfer rates of the two processes of various concentrations were discussed and evaluated. Furthermore, for the purpose of sensing a single Pr{sup 3+} state with a Ce{sup 3+} ion, the optimal distance of Ce{sup 3+} from Pr{sup 3+} was evaluated as 5.60 Å, where the probability of success reaches its maximum value of 78.66%, and meanwhile the probabilities were evaluated for a series of Y{sup 3+} sites in a YAG lattice. These results will be of valuable reference for achievement of the optimal energy transfer efficiency in Pr{sup 3+}/Ce{sup 3+} doped YAG and other similar systems.

Electronic and crystal structure, EPR and magnetic investigations of YF{sub 3}:1%RE (RE = Pr, Ho, Er and Tm) and LaF{sub 3}:1%Pr nanocrystals

Energy Technology Data Exchange (ETDEWEB)

Talik, E., E-mail: talik@us.edu.pl [Institute of Physics, University of Silesia, ul. Uniwersytecka 4, 40-007 Katowice (Poland); Zajdel, P.; Guzik, A.; Skrzypek, D. [Institute of Physics, University of Silesia, ul. Uniwersytecka 4, 40-007 Katowice (Poland); Lipińska, L.; Michalska, M. [Institute of Electronic Materials Technology, ul. Wólczyńska 133, 01-919 Warszawa (Poland)

2014-12-15

Highlights: • The thermal decomposition method was successfully applied for the first time in order to obtain the good quality nanocrystals of YF{sub 3}:1%RE. • For YF{sub 3}:1%Pr and LaF{sub 3}:1%Pr extra phase PrF{sub 3} was found. • The XPS energy gap is about 10 eV. • Surface contamination can be responsible for the deterioration of the optical properties of the composites. - Abstract: A new chemical synthesis route by a thermal decomposition of nitrates and acetates, preceded by solution displacement reaction, was successfully applied to obtain the YF{sub 3}:1%RE (RE = Pr, Ho, Er and Tm) and LaF{sub 3}:1%Pr nanocrystals. The samples were characterized by the following methods: X-ray diffraction, scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), magnetic susceptibility thermal dependence measurements and electron paramagnetic resonance (EPR). The obtained YF{sub 3}:1%RE (RE = Pr, Ho, Er and Tm) materials crystallized with orthorhombic symmetry, whilst LaF{sub 3}:1%Pr exhibits hexagonal structure. Chemical composition determined by EDX, XPS and magnetic measurements was close to nominal formula. SEM images show the nanometric size of the grains. Surface contamination can be suggested to be responsible for the deterioration of the optical properties of the composites.

Electronic structure of PrBa2Cu3O7

International Nuclear Information System (INIS)

Singh, D.J.

1994-01-01

Electronic-structure calculations, within the local spin density approximation (LSDA), are reported for PrBa 2 Cu 3 O 7 . Significant charge transfer from the Pr ions to both the CuO 2 planes and the chains is found relative to YBa 2 Cu 3 O 7 . This supports hole depletion explanations for the insulating character of PrBa 2 Cu 3 O 7 . The LSDA electronic structure shows a prominent ''ridge'' Fermi surface analogous to that in YBa 2 Cu 3 O 7 , but broader. It is proposed that high-resolution positron measurements of this width may provide a useful test of hole depletion models

Synthesis and growth of single crystals of PrCl3

International Nuclear Information System (INIS)

Pei, Jen Shieh.

1984-01-01

An efficient method for growth of high optical quality single crystals of PrCl 3 . The method consists in careful drying of the hydrated chloride, PrCl 3 . 7H 2 O, with a protective atmosphere of anhydrous HCl and Ar. A subsequent growth was done by the zone melting technique. The hydrated chloride had prepared from dissolution of the oxide Pr 6 O 11 in hydrochloric acid. The grown crystals had characterized fluorescence and x-ray diffraction measurements. (Author) [pt

Calculation of effective Coulomb interaction in PrCoO3

Science.gov (United States)

Dutta, Paromita; Lal, Sohan; Pandey, Sudhir K.

2018-04-01

It is very essential to know the suitable value of effective coulomb interaction (Ueff) which will be material specific, if one wants to learn about various physical features of strongly correlated systems in an extensive manner. In present work, the constrained density function theory (DFT) method has been used to evaluate the suitable Ueff value between the localized electrons for 3d and 4f orbitals in strongly correlated system. For the evaluation of suitable Ueff, the d/f-linearization energy (Ed/f) is very important and is found to be >= 44 eV above Fermi level. The Ueff is predicted by local density approximation (LDA) functional for both the impurity atoms separately are found to be Co (3d electrons) ˜ 6.3 eV and Pr (4f electrons) ˜ 7.0 eV for Ed/f ˜ 44 eV above Fermi level. The Ueff value for Pr (4f electrons) is higher than Co (3d electrons). This indicates that Pr 4f electrons is more localized than Co 3d electrons in PrCoO3 compound.

Potentiometric and spectral studies of complex formation of La(3), Pr(3) and Lu(3) with aspartic acid and asparagine

International Nuclear Information System (INIS)

Wojciechowska, A.; Lomozik, L.; Zielinski, S.

1987-01-01

The composition and stability of La 3+ , Pr 3+ and Lu 3+ complexes with aspartic acid and asparagine were analysed. The formation of complexes of the type ML and MHL was determined for La 3+ and Pr 3+ with aspartic acid, and of the type MHL for Lu 3+ with aspartic acid. For La 3+ , Pr 3+ and Lu 3+ with asparagine the formation of ML(OH) complexes was observed. By means of 1 HNMR and 13 CNMR studies the participation in the coordination of both -COOH groups was determined for aspartic acid, whereas for asparagine the participation of the -COOH group was determined in complexes with La 3+ , Pr 3+ , and of the -COOH and the -NH 2 groups in the complex with Lu 3+ . (Author)

39 CFR 6.3 - Notice of meetings.

Science.gov (United States)

2010-07-01

... 39 Postal Service 1 2010-07-01 2010-07-01 false Notice of meetings. 6.3 Section 6.3 Postal Service UNITED STATES POSTAL SERVICE THE BOARD OF GOVERNORS OF THE U.S. POSTAL SERVICE MEETINGS (ARTICLE VI) § 6.3 Notice of meetings. The Chairman or the members of the Board may give the notice required under...

Temperature dependence of the ultraviolet luminescence of Pr3+-doped 20Al(PO3)3-80LiF glass scintillator

International Nuclear Information System (INIS)

Tsuboi, Mizuki; Takeda, Kohei; Nakazato, Tomoharu

2017-01-01

The development of scintillator materials for scattered neutrons is essential in studying laser fusion experiments. We have previously investigated and proposed Pr 3+ -doped 20Al(PO 3 ) 3 -80LiF (APLF + Pr) glasses as scintillators for neutron detection. The APLF + Pr glass emissions are then investigated with synchrotron radiation excitation and varying sample temperature. APLF + Pr glasses exhibit luminescence emission located at 200 to 300 nm and 400 nm attributed to the 4f5d → 4f 2 and 4f 2 → 4f 2 ( 1 S 0 → 3 P j + 1 I 6 ) transitions, respectively. In addition, the 200 to 300-nm emission is not substantially affected by temperature, while the 400-nm emission intensities increase with decreasing sample temperature. This temperature dependence is attributed to cross relaxation whose effect can be controlled by the Pr-doping concentration. Our results suggest that doping concentration of APLF + Pr must be optimized and that APLF + Pr glasses must operate a low temperatures for better neutron detection. (author)

Nitrate-assisted photocatalytic efficiency of defective Eu-doped Pr(OH)3 nanostructures.

Science.gov (United States)

Aškrabić, S; Araújo, V D; Passacantando, M; Bernardi, M I B; Tomić, N; Dojčinović, B; Manojlović, D; Čalija, B; Miletić, M; Dohčević-Mitrović, Z D

2017-12-06

Pr(OH) 3 one-dimensional nanostructures are a less studied member of lanthanide hydroxide nanostructures, which recently demonstrated an excellent adsorption capacity for organic pollutant removal from wastewater. In this study, Pr 1-x Eu x (OH) 3 (x = 0, 0.01, 0.03, and 0.05) defective nanostructures were synthesized by a facile and scalable microwave-assisted hydrothermal method using KOH as an alkaline metal precursor. The phase and surface composition, morphology, vibrational, electronic and optical properties of the as-prepared samples were characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), inductively coupled plasma optical emission spectrometry (ICP-OES), transmission electron microscopy (TEM), field emission scanning electron microscopy (FE-SEM), Raman, infrared (IR), photoluminescence (PL), and diffuse reflectance spectroscopy (DRS). It was deduced that the incorporation of Eu 3+ ions promoted the formation of oxygen vacancies in the already defective Pr(OH) 3 , subsequently changing the Pr(OH) 3 nanorod morphology. The presence of KNO 3 phase was registered in the Eu-doped samples. The oxygen-deficient Eu-doped Pr(OH) 3 nanostructures displayed an improved photocatalytic activity in the removal of reactive orange (RO16) dye under UV-vis light irradiation. An enhanced photocatalytic activity of the Eu-doped Pr(OH) 3 nanostructures was caused by the synergetic effect of oxygen vacancies and Eu 3+ (NO 3 - ) ions present on the Pr(OH) 3 surface, the charge separation efficiency and the formation of the reactive radicals. In addition, the 3% Eu-doped sample exhibited very good adsorptive properties due to different morphology and higher electrostatic attraction with the anionic dye. Pr 1-x Eu x (OH) 3 nanostructures with the possibility of tuning their adsorption/photocatalytic properties present a great potential for wastewater treatment.

Half metallic ferromagnet Pr_0_._9_5Mn_0_._9_3_9O_3 for spin based devices

International Nuclear Information System (INIS)

Santhosh Kumar, B.; Praveen Shankar, N.; Venkateswaran, C.; Manimuthu, P.

2016-01-01

Half Metallic Ferromagnets (HMF) are excellent candidates for spintronics devices due to their unusual 3d and 4s bands. Band theory and first principles calculations strongly predict that Pr based compounds are promising HMF candidates due to their spin hybridisation. Among all Pr based HMF, Pr_0_._9_5Mn_0_._9_3_9O_3 is special because of its pervoskite structure. The different oxidation states of Mn and Pr will enhance the hybridisation of 3d and 4f bands. The present study is experimental effort on the preparation of Pr based compounds

LiNbO3 :Pr3+ : A Multipiezo Material with Simultaneous Piezoelectricity and Sensitive Piezoluminescence.

Science.gov (United States)

Tu, Dong; Xu, Chao-Nan; Yoshida, Akihito; Fujihala, Masayoshi; Hirotsu, Jou; Zheng, Xu-Guang

2017-06-01

Red-emitting piezoluminescence (elasticoluminescence) is achieved by doping rare earth Pr 3+ into the well-known piezoelectric matrix, LiNbO 3 . By precisely tuning the Li/Nb ratio in nonstoichiometric Li x NbO 3 :Pr 3+ , a material that exhibits an unusually high piezoluminescence intensity, which far exceeds that of any well-known piezoelectric material, is produced. Li x NbO 3 :Pr 3+ shows excellent strain sensitivity at the lowest strain level, with no threshold for stress sensing. These multipiezo properties of sensitive piezoluminescence in a piezoelectric matrix are ideal for microstress sensing, damage diagnosis, electro-mechano-optical energy conversion, and multifunctional control in optoelectronics. © 2017 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

76 FR 46283 - Peoples Natural Gas Company LLC; Notice of Baseline Filing

Science.gov (United States)

2011-08-02

... DEPARTMENT OF ENERGY Federal Energy Regulatory Commission [Docket No. PR11-3-001] Peoples Natural Gas Company LLC; Notice of Baseline Filing Take notice that on July 20, 2011, Peoples Natural Gas... provided under Section 311 of the Natural Gas Policy Act of 1978 (NGPA). Any person desiring to participate...

Luminescence and energy transfer of Ce{sup 3+} and Pr{sup 3+} in LaBSiO{sub 5}

Energy Technology Data Exchange (ETDEWEB)

Zhou, Lei; Zhou, Weijie; Shi, Rui; Liu, Chunmeng [MOE Key Laboratory of Bioinorganic and Synthetic Chemistry, KLGHEI of Environment and Energy Chemistry, School of Chemistry and Chemical Engineering, Sun Yat-sen University, Guangzhou 510275 (China); Huang, Yan; Tao, Ye [Beijing Synchrotron Radiation Facility, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100039 (China); Liang, Hongbin, E-mail: cesbin@mail.sysu.edu.cn [MOE Key Laboratory of Bioinorganic and Synthetic Chemistry, KLGHEI of Environment and Energy Chemistry, School of Chemistry and Chemical Engineering, Sun Yat-sen University, Guangzhou 510275 (China)

2016-09-15

Ce{sup 3+}, Pr{sup 3+} singly doped and Ce{sup 3+}–Pr{sup 3+} doubly doped LaBSiO{sub 5} phosphors were prepared by a high-temperature solid state reaction route. The synchrotron radiation VUV–UV excitation spectra of Ce{sup 3+} and Pr{sup 3+} were measured and the luminescence properties were discussed. The band gap of host compound LaBSiO{sub 5} was estimated from the VUV excitation spectrum of sample activated with Gd{sup 3+}. Furthermore, the influence of temperature on luminescence of Ce{sup 3+} was discussed and the activation energy for thermal quenching was evaluated. The occurrence of energy transfer from excited 5d states of Pr{sup 3+} to Ce{sup 3+} was confirmed by the emission spectra of co-doped samples La{sub 0.99−x}Pr{sub x}Ce{sub 0.01}BSiO{sub 5} and La{sub 0.995−x}Pr{sub 0.005}Ce{sub x}BSiO{sub 5} with different x values.

Electronic structures of PrBa2Cu3O7 and PrBa2Cu4O8 systems based on LSDA+U approach

International Nuclear Information System (INIS)

Shirazi, M.; Tavana, A.; Akhavan, M.

2007-01-01

Full text: The electronic structures of PrBa 2 Cu 3 O 7 (Pr123) and PrBa 2 Cu 4 O 8 (Pr124) have been obtained by means of the density functional theory in the local spin density approximation plus on-site Coulomb interaction. The correlation correction has been applied to the Cu 3d and Pr 4f states. Calculations show that the localized Pr-O bands form near the Fermi surface and do not cross the Fermi level. Comparison of the hole absorbing ability of pfy and the pdy states shows that pfy state has dominant role in grabbing holes from the system and causes Pr124 to be non-superconducting like Pr123. We suggest that hybridization of Pr and O atoms in Pr124 system is weaker than Pr123 compound and this may be the reason for the higher critical doping of Pr by which the superconductivity is completely suppressed. Displacement of the conduction bands at the Fermi level is the criterion of Cu (3dx2-y2) character, and when Cu (3dx2-y2) character is stronger in a band, the band displaces more intensively under applying the correction Ucu. We estimate the hole-concentration from this displacement, and good agreement with experiment is seen. The displacement of the CuO 2 plane bands in the minority and majority spin channels in Pr124 is less than that in Pr123. Displacement of the double chain bands in Pr124 is higher than the single chain bands in Pr123. This feature is related to a stronger Cu (3dx2-y2) character in the double chain. So, the spin and conduction features of the Pr124 double chains are stronger than Pr123 single chain, which is the origin of metallic behavior of Pr124 at low temperatures.(authors)

Electronic structures of PrBa2Cu3O7 and PrBa2Cu4O8 systems based on LSDA+U approach

International Nuclear Information System (INIS)

Shirazi, M.; Tavana, A.; Akhavan, M.

2007-01-01

Full text: The electronic structures of PrBa 2 Cu 3 O 7 (Pr123) and PrBa 2 Cu 4 O 8 (Pr124) have been obtained by means of the density functional theory in the local spin density approximation plus on-site Coulomb interaction. The correlation correction has been applied to the Cu 3d and Pr 4f states. Calculations show that the localized Pr-O bands form near the Fermi surface and do not cross the Fermi level. Comparison of the hole absorbing ability of pfy and the pdy states shows that pfy state has dominant role in grabbing holes from the system and causes Pr124 to be non-superconducting like Pr123. We suggest that hybridization of Pr and O atoms in Pr124 system is weaker than Pr123 compound and this may be the reason for the higher critical doping of Pr by which the superconductivity is completely suppressed. Displacement of the conduction bands at the Fermi level is the criterion of Cu (3dx2-y2) character, and when Cu (3dx2-y2) character is stronger in a band, the band displaces more intensively under applying the correction Ucu. We estimate the hole-concentration from this displacement, and good agreement with experiment is seen. The displacement of the CuO 2 plane bands in the minority and majority spin channels in Pr124 is less than that in Pr123. Displacement of the double chain bands in Pr124 is higher than the single chain bands in Pr123. This feature is related to a stronger Cu (3dx2-y2) character in the double chain. So, the spin and conduction features of the Pr124 double chains are stronger than Pr123 single chain, which is the origin of metallic behavior of Pr124 at low temperatures. (authors)

Influence of Li+ charge compensator ion on the energy transfer from Pr3 + to Gd3 + ions in Ca9Mg(PO4)6F2:Gd3 +, Pr3 +, Li+ phosphor

Science.gov (United States)

Tamboli, Sumedha; Dhoble, S. J.

2017-09-01

Phototherapy is a renowned treatment for curing skin diseases since ancient times. Phototherapeutic treatment for psoriasis and many other diseases require narrow band ultra violet-B (NB-UVB) light with peak intensity at 313 nm to be exposed to the affected part of body. In this paper, we report combustion synthesis of NB-UVB - 313 nm emitting Ca9Mg(PO4)6F2 phosphors doped with Gd3 +, Pr3 + and Li+ ions. The phase formation was confirmed by obtaining X-ray diffraction (XRD) pattern and morphology was studied with the Scanning electron microscopy (SEM) images. Photoluminescence (PL) emission spectra show intense narrow band emission at 313 nm under 274 nm excitation wavelengths. Emission intensity was enhanced when Ca9Mg(PO4)6F2 compound is co-doped with Pr3 + ions. Excitation spectra of Ca9Mg(PO4)6F2:Gd3 +, Pr3 + doped samples shows broad excitation in ultra violet C (UVC) region. Diffuse reflectance spectra (DRS), obtained by UV-visible spectrophotometer, measures the absorption properties of the material. By applying Kubelka Munk function on the diffuse reflectance spectra, band gap of the material is determined. PL decay curves were examined which indicates efficient energy transfer between Pr3 + and Gd3 + ions. Charge compensation effect was also studied by co-doping Li+ ion in host. Emission intensity was found to increase with the addition of charge compensator. The prepared phosphor has potential to convert UVC light into NB-UVB. The luminescence intensity of Gd3 + shows remarkable increase when it is sensitized with Pr3 +, and an addition of charge compensator in the form of Li+, show even better results. This phosphor surely has the potential to be used as phototherapy lamp phosphor.

Luminescent properties and quenching effects of Pr3+ co-doping in SiO2:Tb3+/Eu3+ nanophosphors

CSIR Research Space (South Africa)

Mhlongo, GH

2014-02-01

Full Text Available Luminescence properties of Pr(sup3+) single doped SiO2 and Pr(sup3+) co-doped SiO(sub2):Tb(sup3+)/Eu(sup3+) nanophosphors synthesized using sol–gel method were investigated. X-ray diffraction (XRD), and scanning electron microscope (SEM) were used...

Luminescence and light yield of (Gd2Y)(Ga3Al2)O12:Pr3+ single crystal scintillators

Science.gov (United States)

Lertloypanyachai, Prapon; Pathumrangsan, Nichakorn; Sreebunpeng, Krittiya; Pattanaboonmee, Nakarin; Chewpraditkul, Weerapong; Yoshikawa, Akira; Kamada, Kei; Nikl, Martin

2017-06-01

Praseodymium-doped (Gd2Y)(Ga3Al2)O12 (GYGAG: Pr) single crystals are grown by the micro-pulling down method with different Pr concentrations. The energy transfer process between Pr3+ and Gd3+ is investigated by photoluminescence excitation (PLE) and emission (PL) spectra measurements. Photoelectron yield measurements are carried out using photomultiplier. At 662 keV γ-rays, photoelectron yield of 2520 phe/MeV obtained for the GYGAG: Pr (0.01%) sample is larger than that of 1810 phe/MeV obtained for BGO crystal. Light yield degradation for the GYGAG: Pr scintillators is presumably due to the energy transfer from 5d state of Pr3+ to 4f state of Gd3+ together with the concentration quenching in the Gd3+-sublattice.

Magnetic order in PrBa2Cu3O6+x

DEFF Research Database (Denmark)

Longmore, A.; Nutley, M.P.; Boothroyd, A.T.

1994-01-01

We have studied the magnetic ordering of the Cu and Pr ions in PrBa2Cu3O6+x by neutron diffraction on single crystals with different oxygen contents. Two types of Cu ordering were observed, qualitatively similar to the anti-ferromagnetic phases reported in some studies of YBa2Cu3O6+x. A third...... magnetic structure was observed below 15K, which we believe corresponds to the magnetic ordering of the Pr sub-lattice....

76 FR 5797 - Notice of Baseline Filings

Science.gov (United States)

2011-02-02

... DEPARTMENT OF ENERGY Federal Energy Regulatory Commission [Docket No. PR10-114-001; Docket No. PR10-129-001; Docket No. PR10-131- 001; Docket No. PR10-68-002 Not Consolidated] Notice of Baseline... applicants listed above submitted a revised baseline filing of their Statement of Operating Conditions for...

Incommensurate magnetism in PrBa2Cu3O6.92

DEFF Research Database (Denmark)

Hill, J.P.; Boothroyd, A.T.; Andersen, N.H.

1998-01-01

We report resonant x-ray magnetic scattering and high-resolution neutron-diffraction studies of the Pr site magnetism in high quality single crystals of PrBa2Cu3O6.92. These studies reveal that the Pr sublattice orders at 19 K in a well correlated, long period incommensurate structure with probable...

The down-conversion and up-conversion photoluminescence properties of Na0.5Bi0.5TiO3:Yb3+/Pr3+ ceramics

International Nuclear Information System (INIS)

Huang, Yinpeng; Luo, Laihui; Wang, Jia; Zuo, Qianghui; Yao, Yongjie; Li, Weiping

2015-01-01

Na 0.5 Bi 0.5−x−y Yb x Pr y TiO 3 (NBT:xYb/yPr) ceramics with different Yb and Pr contents are prepared. Both the down-conversion (DC) and up-conversion (UC) photoluminescence (PL) of the ceramics via 453 and 980 nm excitation, respectively, are investigated. The effect of Yb 3+ and Pr 3+ doping contents on the DC and UC PL is significantly different from each other. Furthermore, the UC PL of the ceramics as a function of temperatures is measured to investigate the UC process in detail. Based on energy level diagram of Pr 3+ and Yb 3+ ions and the DC and UC PL spectra, the DC and UC PL mechanisms of Pr 3+ and Yb 3+ ions are discussed. Especially, the UC PL mechanism is clarified, which is different from the previously reported literature. Also, the temperature sensing properties of the ceramics are studied based on the photoluminescence ratio technique, using the thermal coupling energy levels of Pr 3+

Moessbauer studies of single crystal Pr sub 1 sub / sub 3 Sr sub 2 sub / sub 3 FeO sub 3

CERN Document Server

Uhm, Y R; Kim, C S; Tomioka, Y; Tokura, Y

2000-01-01

Single crystal Pr sub 1 sub / sub 3 Sr sub 2 sub / sub 3 FeO sub 3 was synthesized by using the floating zone method and the relation of magnetic properties and charge ordering transition with lattice dynamics was systematically investigated. Moessbauer spectra of Pr sub 1 sub / sub 3 sub S r sub 2 sub / sub 3 FeO sub 3 were taken at various temperatures ranging from 20 K to room temperature. The charge disproportionation, in which iron with valence states Fe sup 3 sup + and Fe sup 5 sup + was found in a ratio of 2:1, was detected in Pr sub 1 sub / sub 3 Sr sub 2 sub / sub 3 FeO sub 3 below 190+-3 K. Iron with valence state Fe sup 4 sup + coexisted in Pr sub 1 sub / sub 3 sub S r sub 2 sub / sub 3 FeO sub 3 at and above 150 K, and its ratio increased from 13 to 66 % with increasing temperature. This result means that charge-ordered and -disordered phases co-exist in Pr sub 1 sub / sub 3 Sr sub 2 sub / sub 3 FeO sub 3.

75 FR 70732 - Notice of Baseline Filings

Science.gov (United States)

2010-11-18

... DEPARTMENT OF ENERGY Federal Energy Regulatory Commission [Docket No. PR11-71-000; Docket No. PR11-72-000; Docket No. PR11-73- 000] Notice of Baseline Filings November 10, 2010. Docket No. PR11-71-000..., 2010, the applicants listed above submitted their baseline filing of their Statement of Operating...

Thermoluminescent response of LaAlO{sub 3}:Pr; Respuesta termoluminiscente de LaAlO{sub 3}:Pr

Energy Technology Data Exchange (ETDEWEB)

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

2015-10-15

In this study, the thermoluminescence response of doped lanthanum aluminate (LaAlO{sub 3}) with praseodymium ion (Pr) obtained by the Pechini method and drying by the spraying technique Spry Dryer was studied. The obtained powders were analyzed structurally by the X-ray diffraction technique; the morphological characterization was by the scanning electron microscopy technique. The obtained powders at 800 degrees C presented crystallinity and showed a Rhombohedral crystal structure, this phase was observed by X-ray diffraction patterns. Thermoluminescence response of LaAlO{sub 3}:Pr showed a brightness curve with a peak centered at 157 degrees C. The sensitivity of the doped samples was improved about 90 times in comparison with the undoped sample. Thermoluminescence response in function of the wavelength showed a maximum at 230 nm, reproducibility of thermoluminescence response was ±50%. Also the fading in thermoluminescence response was studied. (Author)

Polo-like kinase 3 (PLK3) mediates the clearance of the accumulated PrP mutants transiently expressed in cultured cells and pathogenic PrP(Sc) in prion infected cell line via protein interaction.

Science.gov (United States)

Wang, Hui; Tian, Chan; Fan, Xue-Yu; Chen, Li-Na; Lv, Yan; Sun, Jing; Zhao, Yang-Jing; Zhang, Lu-bin; Wang, Jing; Shi, Qi; Gao, Chen; Chen, Cao; Shao, Qi-Xiang; Dong, Xiao-Ping

2015-05-01

Polo-like kinases (PLKs) family has long been known to be critical for cell cycle and recent studies have pointed to new dimensions of PLKs function in the nervous system. Our previous study has verified that the levels of PLK3 in the brain are severely downregulated in prion-related diseases. However, the associations of PLKs with prion protein remain unclear. In the present study, we confirmed that PrP protein constitutively interacts with PLK3 as determined by both in vitro and in vivo assays. Both the kinase domain and polo-box domain of PLK3 were proved to bind PrP proteins expressed in mammalian cell lines. Overexpression of PLK3 did not affect the level of wild-type PrP, but significantly decreased the levels of the mutated PrPs in cultured cells. The kinase domain appeared to be responsible for the clearance of abnormally aggregated PrPs, but this function seemed to be independent of its kinase activity. RNA-mediated knockdown of PLK3 obviously aggravated the accumulation of cytosolic PrPs. Moreover, PLK3 overexpression in a scrapie infected cell line caused notable reduce of PrP(Sc) level in a dose-dependent manner, but had minimal effect on the expression of PrP(C) in its normal partner cell line. Our findings here confirmed the molecular interaction between PLK3 and PrP and outlined the regulatory activity of PLK3 on the degradation of abnormal PrPs, even its pathogenic isoform PrP(Sc). We, therefore, assume that the recovery of PLK3 in the early stage of prion infection may be helpful to prevent the toxic accumulation of PrP(Sc) in the brain tissues. Copyright © 2015 Elsevier Ltd. All rights reserved.

Spin-spin cross relaxation and spin-Hamiltonian spectroscopy by optical pumping of Pr/sup 3+/:LaF3

International Nuclear Information System (INIS)

Lukac, M.; Otto, F.W.; Hahn, E.L.

1989-01-01

We report the observation of an anticrossing in solid-state laser spectroscopy produced by cross relaxation. Spin-spin cross relaxation between the /sup 141/Pr- and /sup 19/F-spin reservoirs in Pr/sup 3+/:LaF 3 and its influence on the /sup 141/Pr NMR spectrum is detected by means of optical pumping. The technique employed combines optical pumping and hole burning with either external magnetic field sweep or rf resonance saturation in order to produce slow transient changes in resonant laser transmission. At a certain value of the external Zeeman field, where the energy-level splittings of Pr and F spins match, a level repulsion and discontinuity of the Pr/sup 3+/ NMR lines is observed. This effect is interpreted as the ''anticrossing'' of the combined Pr-F spin-spin reservoir energy states. The Zeeman-quadrupole-Hamiltonian spectrum of the hyperfine optical ground states of Pr/sup 3+/:LaF 3 is mapped out over a wide range of Zeeman magnetic fields. A new scheme is proposed for dynamic polarization of nuclei by means of optical pumping, based on resonant cross relaxation between rare spins and spin reservoirs

Visible-to-UVC upconversion efficiency and mechanisms of Lu{sub 7}O{sub 6}F{sub 9}:Pr{sup 3+} and Y{sub 2}SiO{sub 5}:Pr{sup 3+} ceramics

Energy Technology Data Exchange (ETDEWEB)

Cates, Ezra L. [Department of Environmental Engineering and Earth Sciences, Clemson University, Anderson, SC 29625 (United States); Center for Optical Materials Science and Engineering Technologies, Clemson University, Anderson, SC 29625 (United States); Wilkinson, Angus P. [School of Chemistry and Biochemistry, Georgia Institute of Technology, Atlanta, GA 30332 (United States); Kim, Jae-Hong, E-mail: jaehong.kim@yale.edu [Department of Chemical and Environmental Engineering, Yale University, New Haven, CT 06511 (United States)

2015-04-15

Visible-to-UVC upconversion (UC) by Pr{sup 3+}-doped materials is a promising candidate for application to sustainable disinfection technologies, including light-activated antimicrobial surfaces and solar water treatment. In this work, we studied Pr{sup 3+} upconversion in an oxyfluoride host system for the first time, employing Lu{sub 7}O{sub 6}F{sub 9}:Pr{sup 3+} ceramics. Compared to the previously studied Y{sub 2}SiO{sub 5}:Pr{sup 3+} reference material, the oxyfluoride host resulted in a 5-fold increase in intermediate state lifetime, likely due to a lower maximum phonon energy; however, only a 60% gain in UC intensity was observed. To explain this discrepancy, luminescence spectral distribution and decay kinetics were studied in both phosphor systems. The Pr{sup 3+} 4f5d band energy distribution in each phosphor was found to play a key role by allowing or disallowing the occurrence of a previously unexplored UC mechanism, which had a significant impact on overall efficiency. - Highlights: • Visible-to-UVC upconversion by Pr{sup 3+} was studied in an oxyfluoride host matrix for the first time. • Lu{sub 7}O{sub 6}F{sub 9}:Pr{sup 3+} ceramics were synthesized and characterized. • Lu{sub 7}O{sub 6}F{sub 9}:Pr{sup 3+} shows more intense UV upconversion than Y{sub 2}SiO{sub 5}:Pr{sup 3+}, with differing mechanisms. • 4f5d band energy and {sup 1}D{sub 2} involvement are important in maximizing upconversion efficiency.

Anomalous properties of PrBa2Cu3O7: a comment

International Nuclear Information System (INIS)

Sampathkumaran, E.V.

1992-01-01

Considerable attention has been paid in the literature to understand the suppression of superconductivity and the large Neel temperature of the Pr sub-lattice in PrBa 2 Cu 3 O 7 . Here we briefly recall the superconducting and magnetic anomalies noted earlier in other Pr based systems due to the partial delocalisation of the Pr-4f orbital to show that the gross anomalous features observed for PrBa 2 Cu 4 O 7 are not unique. (orig.)

Poppers and PrEP: Use of Pre-exposure Prophylaxis Among Men Who Have Sex with Men Who Use Inhaled Nitrites.

Science.gov (United States)

Hambrick, H Rhodes; Park, Su Hyun; Schneider, John A; Mayer, Kenneth H; Carrico, Adam W; Sherman, Scott E; Duncan, Dustin T

2018-05-09

Men who have sex with men (MSM) commonly use inhaled nitrites, or poppers, though their use is a risk factor HIV seroconversion. Pre-exposure prophylaxis, or PrEP, is effective for HIV prevention, but is not widely used, and little is known regarding PrEP use and acceptability among MSM who use inhaled nitrites. We surveyed 580 MSM in Paris, France in 2016 about popper use, sexual behaviors including condomless anal intercourse (CAI), serosorting, and sexual positioning, PrEP use, PrEP candidacy, and interest in alternate PrEP delivery modalities. We included 444 HIV negative participants for the current study. 46.2% reported popper use in the prior 3 months. Using multivariate adjusted logistic regression, we found that popper users were more likely than non-users to consider themselves candidates for PrEP [adjusted relative risk ratio (aRRR) = 2.73; 95% CI 1.54-4.83], but they were not more likely to be current (aRRR = 1.54; 95% CI 0.71-3.33) or past (aRRR = 1.37; 95% CI 0.44-4.28) PrEP users. Mediation analyses indicated that increased CAI and serosorting partly explained the relationship between popper use and PrEP candidacy. There was considerable interest in alternate proposed PrEP delivery modalities, particularly long-acting injectable PrEP [adjusted risk ratio (aRR) = 1.43; 95% CI 1.15-1.79].

75 FR 57268 - Notice of Baseline Filings

Science.gov (United States)

2010-09-20

... DEPARTMENT OF ENERGY Federal Energy Regulatory Commission [Docket No. PR10-103-000; Docket No. PR10-104-000; Docket No. PR10-105- 000 (Not Consolidated)] Notice of Baseline Filings September 13..., 2010, and September 10, 2010, respectively the applicants listed above submitted their baseline filing...

S1PR3 Signaling Drives Bacterial Killing and Is Required for Survival in Bacterial Sepsis.

Science.gov (United States)

Hou, JinChao; Chen, QiXing; Wu, XiaoLiang; Zhao, DongYan; Reuveni, Hadas; Licht, Tamar; Xu, MengLong; Hu, Hu; Hoeft, Andreas; Ben-Sasson, Shmuel A; Shu, Qiang; Fang, XiangMing

2017-12-15

Efficient elimination of pathogenic bacteria is a critical determinant in the outcome of sepsis. Sphingosine-1-phosphate receptor 3 (S1PR3) mediates multiple aspects of the inflammatory response during sepsis, but whether S1PR3 signaling is necessary for eliminating the invading pathogens remains unknown. To investigate the role of S1PR3 in antibacterial immunity during sepsis. Loss- and gain-of-function experiments were performed using cell and murine models. S1PR3 levels were determined in patients with sepsis and healthy volunteers. S1PR3 protein levels were up-regulated in macrophages upon bacterial stimulation. S1pr3 -/- mice showed increased mortality and increased bacterial burden in multiple models of sepsis. The transfer of wild-type bone marrow-derived macrophages rescued S1pr3 -/- mice from lethal sepsis. S1PR3-overexpressing macrophages further ameliorated the mortality rate of sepsis. Loss of S1PR3 led to markedly decreased bacterial killing in macrophages. Enhancing endogenous S1PR3 activity using a peptide agonist potentiated the macrophage bactericidal function and improved survival rates in multiple models of sepsis. Mechanically, the reactive oxygen species levels were decreased and phagosome maturation was delayed in S1pr3 -/- macrophages due to impaired recruitment of vacuolar protein-sorting 34 to the phagosomes. In addition, S1RP3 expression levels were elevated in monocytes from patients with sepsis. Higher levels of monocytic S1PR3 were associated with efficient intracellular bactericidal activity, better immune status, and preferable outcomes. S1PR3 signaling drives bacterial killing and is essential for survival in bacterial sepsis. Interventions targeting S1PR3 signaling could have translational implications for manipulating the innate immune response to combat pathogens.

76 FR 78640 - Hattiesburg Industrial Gas Sales, L.L.C.; Notice of Filing

Science.gov (United States)

2011-12-19

... DEPARTMENT OF ENERGY Federal Energy Regulatory Commission [Docket Nos. PR12-8-000 and PR12-9-000] Hattiesburg Industrial Gas Sales, L.L.C.; Notice of Filing Take notice that on December 9, 2011, Hattiesburg Industrial Gas Sales, L.L.C. (Hattiesburg) filed in PR12-8-000 a Statement of Operating Conditions (SOC) with...

75 FR 79334 - Meeting Notice

Science.gov (United States)

2010-12-20

... ARCTIC RESEARCH COMMISSION Meeting Notice Notice is hereby given that the U.S. Arctic Research Commission will hold its 95th meeting in Anchorage, AK, on January 21, 2011. The business session, open to... agenda. (2) Approval of the minutes from the 94th meeting. (3) Commissioners and staff reports. (4...

76 FR 13610 - Enterprise Texas Pipeline LLC; Notice of Compliance Filing

Science.gov (United States)

2011-03-14

... DEPARTMENT OF ENERGY Federal Energy Regulatory Commission [Docket Nos. PR10-14-002; PR11-92-000] Enterprise Texas Pipeline LLC; Notice of Compliance Filing Take notice that on March 1, 2011, Enterprise Texas Pipeline LLC (Enterprise Texas) filed a revised Statement of Rates to its Statement of Operating...

Ferromagnetism in a hexagonal PrRh3 with 4f2 configuration

Science.gov (United States)

Park, G. B.; Yamane, Y.; Onimaru, T.; Umeo, K.; Takabatake, T.

2018-05-01

Electrical resistivity ρ , magnetization M and specific heat C are reported for polycrystalline samples of the hexagonal system PrRh3. The magnetic susceptibility M/B obeys the Curie-Weiss law with the effective magnetic moment μeff = 3.88 μB/Pr and the paramagnetic Curie temperature θp = +2.9 K, which indicates ferro-type magnetic interaction between the trivalent Pr ions. A cusp in C(T) at 3.0 K coincides with a bend in ρ (T). Applying magnetic fields, the peak broadens and shifts to higher temperatures. The field dependence indicates a ferro-type magnetic order. The magnetic entropy Sm is (1/3)Rln2 at TC = 3.0 K, suggesting that part of the Pr ions take part in the magnetic order. A broad tail of the magnetic specific heat Cm observed above TC may result from short-range correlations and/or fluctuations of the active magnetic dipole and quadrupoles in the ground state doublet.

Thermal reorientation of hydrogenic Pr3+ centers

International Nuclear Information System (INIS)

Jones, G. D.

1996-01-01

Sets of five multi-hydrogenic centers of both CaF 2 :Pr 3+ and SrF 2 :Pr 3 + show bleaching under selective polarized-light irradiation. Two forms of bleaching behaviour are observed. In reversible polarized bleaching, irradiation creates re-oriented equivalent centers, which can be restored to the original orientation by switching the laser polarization by 90 deg. Indefinite sequences of bleaching and recovery can be established. In photoproduct bleaching, inequivalent centers are produced, which can be reverted by subsequently selectively exciting their absorption lines. Thermal recovery of the bleached centers on warming the crystals occurs abruptly over a 5 K range around 100 K and is noteworthy in occurring at essentially identical temperatures for H - , D - and T - centers. The simplest model for this thermal recovery is thermal activation of the mobile hydrogenic ions over a double well potential barrier. An alternative model proposed by Universitaet Regensburg requires the involvement of high frequency excitations in scattering processes for surmounting the barrier

Valence determination as a function of doping in $PrBa_{2} Cu_{3} O_{7}$

CERN Document Server

Staub, U; Wasserman, S R; Conner, A G O; Kramer, M J; Patterson, B D; Shi, M; Knapp, M P

2000-01-01

We present results of X-ray absorption near edge spectra (XANES), neutron powder diffraction, and resonant X-ray diffraction on samples of PrBa/sub 2/Cu/sub 3/O/sub 7- delta / and Pr/sub 1-x/Ca/sub x/Ba /sub 2/Cu/sub 3/O/sub 7/. The data are obtained as a function of the doping levels of oxygen and Ca. There are significant changes in the Pr L/sub 3/ XANES spectra with changes in oxygen or Ca concentrations, indicating that the Pr electronic properties are affected by doping. The resonant X-ray scattering experiments show that the changes observed occur on Pr ions incorporated in the PrBa /sub 2/Cu/sub 3/O/sub 7- delta / structure, and are not the result of changes to a Pr-containing impurity phase. A quantitative model, based on literature precedent, is used to extract Pr valences from the data, although the XANES cannot distinguish between models involving charge transfer and those involving hybridization. The results are compared with data obtained from Pb/sub 2/Sr/sub 2/Pr/sub 1-x/Ca/sub x/Cu/sub 3/O/sub ...

In vitro T lymphocyte responses to proteinase 3 (PR3) and linear peptides of PR3 in patients with Wegener's granulomatosis (WG)

NARCIS (Netherlands)

Van der Geld, YM; Huitema, MG; Franssen, CFM; Limburg, PC; Kallenberg, CGM; van der Zee, R.

2000-01-01

T cell-mediated immunity is thought to play an important role in the pathogenesis of WG. In previous studies a minority of WG patients as well as some healthy controls showed in vitro proliferation of their peripheral blood mononuclear cells (PBMC) to PR3, the main autoantigen in WG. The relevant

Toxicity of laser irradiated photoactive fluoride PrF3 nanoparticles toward bacteria

International Nuclear Information System (INIS)

Pudovkin, M S; Korableva, S L; Krasheninnicova, A O; Nizamutdinov, A S; Semashko, V V; Zelenihin, P V; Alakshin, E M; Nevzorova, T A

2014-01-01

The article is devoted to exploration of biological effects of crystalline PrF 3 nanoparticles toward Salmonella typhimurium TA 98 bacteria under the laser irradiation. Obtained results show bactericidal activity of PrF 3 nanoparticles and optimal parameters of laser irradiation (power of laser irradiation, wavelength, diameter of the laser spoil, and exposure time) have been found under which the effects of bactericidal activity become the most significant. Survival of bacterial cells under laser irradiation with wavelength 532 nm in colloidal solution of PrF 3 nanoparticles was 39%, 34%, 20% for exposure times 5 minutes, 15 minutes and 30 minutes, correspondingly

Superionic Conductivity of Sm3+, Pr3+, and Nd3+ Triple-Doped Ceria through Bulk and Surface Two-Step Doping Approach.

Science.gov (United States)

Liu, Yanyan; Fan, Liangdong; Cai, Yixiao; Zhang, Wei; Wang, Baoyuan; Zhu, Bin

2017-07-19

Sufficiently high oxygen ion conductivity of electrolyte is critical for good performance of low-temperature solid oxide fuel cells (LT-SOFCs). Notably, material conductivity, reliability, and manufacturing cost are the major barriers hindering LT-SOFC commercialization. Generally, surface properties control the physical and chemical functionalities of materials. Hereby, we report a Sm 3+ , Pr 3+ , and Nd 3+ triple-doped ceria, exhibiting the highest ionic conductivity among reported doped-ceria oxides, 0.125 S cm -1 at 600 °C. It was designed using a two-step wet-chemical coprecipitation method to realize a desired doping for Sm 3+ at the bulk and Pr 3+ /Nd 3+ at surface domains (abbreviated as PNSDC). The redox couple Pr 3+ /Pr 4+ contributes to the extraordinary ionic conductivity. Moreover, the mechanism for ionic conductivity enhancement is demonstrated. The above findings reveal that a joint bulk and surface doping methodology for ceria is a feasible approach to develop new oxide-ion conductors with high impacts on advanced LT-SOFCs.

Superstructure formation in PrNi_2Al_3 and ErPd_2Al_3

International Nuclear Information System (INIS)

Eustermann, Fabian; Hoffmann, Rolf-Dieter; Janka, Oliver; Oldenburg Univ.

2017-01-01

The intermetallic phase ErPd_2Al_3 was obtained by arc-melting of the elements and subsequent annealing for crystal growth. The sample was studied by X-ray diffraction on powders and single crystals. The structure of ErPd_2Al_3 was refined from X-ray diffraction data and revealed a superstructure of PrNi_2Al_3 - a CaCu_5 derivative (P6/m, a=1414.3(1), c=418.87(3) pm wR=0.0820, 1060 F"2 values, 48 variables). The same superstructure was subsequently found for PrNi_2Al_3 (P6/m, a=1407.87(4), c=406.19(2) pm, wR=0.0499, 904 F"2 values, 47 variables). In the crystal structure, the aluminium and transition metal atoms form a polyanionic network according to [T_2Al_3]"δ"-, while rare earth atoms fill cavities within the networks. They are coordinated by six transition metal and twelve aluminum atoms. In contrast to the PrNi_2Al_3 type structure reported so far, two crystallographic independent rare-earth sites are found of which one (1b) is shifted by 1/2 z, causing a distortion in the structure along with a recoloring of the T and Al atoms in the network.

Oxidation of Helix-3 methionines precedes the formation of PK resistant PrP.

Directory of Open Access Journals (Sweden)

Tamar Canello

2010-07-01

Full Text Available While elucidating the peculiar epitope of the alpha-PrP mAb IPC2, we found that PrPSc exhibits the sulfoxidation of residue M213 as a covalent signature. Subsequent computational analysis predicted that the presence of sulfoxide groups at both Met residues 206 and 213 destabilize the alpha-fold, suggesting oxidation may facilitate the conversion of PrPC into PrPSc. To further study the effect of oxidation on prion formation, we generated pAbs to linear PrP peptides encompassing the Helix-3 region, as opposed to the non-linear complexed epitope of IPC2. We now show that pAbs, whose epitopes comprise Met residues, readily detected PrPC, but could not recognize most PrPSc bands unless they were vigorously reduced. Next, we showed that the alpha-Met pAbs did not recognize newly formed PrPSc, as is the case for the PK resistant PrP present in lines of prion infected cells. In addition, these reagents did not detect intermediate forms such as PK sensitive and partially aggregated PrPs present in infected brains. Finally, we show that PrP molecules harboring the pathogenic mutation E200K, which is linked to the most common form of familial CJD, may be spontaneously oxidized. We conclude that the oxidation of methionine residues in Helix-3 represents an early and important event in the conversion of PrPC to PrPSc. We believe that further investigation into the mechanism and role of PrP oxidation will be central in finally elucidating the mechanism by which a normal cell protein converts into a pathogenic entity that causes fatal brain degeneration.

Race and perceived racism, education, and hypertension among Brazilian civil servants: the Pró-Saúde Study

Directory of Open Access Journals (Sweden)

Eduardo Faerstein

2014-01-01

Full Text Available INTRODUCTION: Brazil has the largest population of African descendants outside Africa. OBJECTIVE: Mindful of the imprint of slavery on their contemporary social position, we investigated the relationship of perceived racism to hypertension. METHODS: We analyzed data (1999 - 2001 from 3,056 civil servants (mean age 42 years; 56% females at university campuses in Rio participating in the longitudinal Pró-Saúde Study. RESULTS: Cases of prevalent hypertension had measured blood pressure equal to or greater than 140/90 mmHg or used antihypertensive medication. Self-administered questionnaires assessed participants' perceived history of lifetime discrimination (due to race, gender, socioeconomic position, and other attributes at work and school, neighborhood, public places, and in contact with the police. Participants used 41 terms as responses to an open-ended question on racial self-identification; for these analyses, 48% were classified as afrodescendants. Racial discrimination in at least one setting was reported by 14% of afrodescendants. Compared to whites, the age- and gender-adjusted prevalence of hypertension was higher for afrodescendants with history of self-perceived racism (prevalence ratio - PR = 2.1; 95%CI 1.5 - 3.0 than for those with no such history (PR = 1.5; 95%CI 1.2 - 1.8. Comparing the former to whites, the adjusted association with hypertension was stronger for those with elementary education (PR = 3.0; 95%CI 1.3 - 6.7 than for those with a college degree (PR = 1.7; 95%CI 1.0 - 3.1. CONCLUSION: Racism may increase the risk of hypertension of afrodescendants in Brazil, and socioeconomic disadvantage - also influenced by societal racism - may further potentiate this increased risk.

Race and perceived racism, education, and hypertension among Brazilian civil servants: the Pró-Saúde Study.

Science.gov (United States)

Faerstein, Eduardo; Chor, Dóra; Werneck, Guilherme Loureiro; Lopes, Claudia de Souza; Kaplan, George

2014-01-01

Brazil has the largest population of African descendants outside Africa. Mindful of the imprint of slavery on their contemporary social position, we investigated the relationship of perceived racism to hypertension. We analyzed data (1999 - 2001) from 3,056 civil servants (mean age 42 years; 56% females) at university campuses in Rio participating in the longitudinal Pró-Saúde Study. Cases of prevalent hypertension had measured blood pressure equal to or greater than 140/90 mmHg or used antihypertensive medication. Self-administered questionnaires assessed participants' perceived history of lifetime discrimination (due to race, gender, socioeconomic position, and other attributes) at work and school, neighborhood, public places, and in contact with the police. Participants used 41 terms as responses to an open-ended question on racial self-identification; for these analyses, 48% were classified as afrodescendants. Racial discrimination in at least one setting was reported by 14% of afrodescendants. Compared to whites, the age- and gender-adjusted prevalence of hypertension was higher for afrodescendants with history of self-perceived racism (prevalence ratio--PR = 2.1; 95%CI 1.5-3.0) than for those with no such history (PR = 1.5; 95%CI 1.2-1.8). Comparing the former to whites, the adjusted association with hypertension was stronger for those with elementary education (PR = 3.0; 95%CI 1.3-6.7) than for those with a college degree (PR = 1.7; 95%CI 1.0-3.1). Racism may increase the risk of hypertension of afrodescendants in Brazil, and socioeconomic disadvantage--also influenced by societal racism--may further potentiate this increased risk.

Electrocardiogram PR Interval Is a Surrogate Marker to Predict New Occurrence of Atrial Fibrillation in Patients with Frequent Premature Atrial Contractions.

Science.gov (United States)

Chun, Kwang Jin; Hwang, Jin Kyung; Choi, So Ra; Park, Seung-Jung; On, Young Keun; Kim, June Soo; Park, Kyoung-Min

2016-04-01

The clinical significance of prolonged PR interval has not been evaluated in patients with frequent premature atrial contractions (PACs). We investigated whether prolonged PR interval could predict new occurrence of atrial fibrillation (AF) in patients with frequent PACs. We retrospectively analyzed 684 patients with frequent PACs (> 100 PACs/day) who performed repeated 24-hour Holter monitoring. Prolonged PR interval was defined as longer than 200 msec. Among 684 patients, 626 patients had normal PR intervals (group A) and 58 patients had prolonged PR intervals (group B). After a mean follow-up of 59.3 months, 14 patients (24.1%) in group B developed AF compared to 50 patients (8.0%) in group A (P PR interval (hazard ratio [HR], 1.950; 95% CI, 1.029-3.698; P = 0.041), age (HR, 1.033; 95% CI, 1.006-1.060; P = 0.015), and left atrial (LA) dimension (HR, 1.061; 95% CI, 1.012-1.112; P = 0.015) were associated with AF occurrence. Prolonged PR interval, advanced age, and enlarged LA dimension are independent risk factors of AF occurrence in patients with frequent PACs.

Pr and Gd co-doped bismuth ferrite thin films with enhanced

Indian Academy of Sciences (India)

Pr and Gd co-modified Bi0.95−PrGd0.05FeO3 ( = 0.00, 0.05, 0.10) (BPGFO) thin films on Pt(111)/Ti/SiO2/Si(100) substrates were prepared by a sol-gel together with spin coating technique. A detailed study of electrical and magnetic properties of these thin films is reported. X-ray diffraction analysis shows that, with an ...

Prática de futebol e fatores sociodemográficos associados em adolescentes La práctica de fútbol y factores sociodemográficos asociados en adolescentes Soccer practice and associated sociodemographic factors in adolescents

Directory of Open Access Journals (Sweden)

Diego Augusto Santos Silva

2013-03-01

Full Text Available Objetivou-se verificar a associação entre a prática de futebol com fatores sociodemográficos em escolares. A amostra foi composta por 906 estudantes de escolas públicas de Aracaju, Sergipe, Brasil, com média de 15,11 (DP=2,19 anos de idade. Utilizou-se a regressão de Poisson para o cálculo da razão de prevalência (RP e intervalos de confiança de 95% (IC95%. Dos estudantes investigados, 49,1% não praticavam futebol. Os escolares com maiores probabilidades de não praticar futebol foram os do sexo feminino (RP: 3,28; IC95%: 2,59-4,15 e do ensino médio (RP: 1,45; IC95%: 1,10-1,92. Quase metade dos estudantes não pratica futebol e, independente da faixa etária e nível econômico, em estudantes do sexo feminino e do ensino médio a probabilidade de prática na modalidade é ainda menor.Este estudio evaluó la asociación entre la práctica de fútbol con factores sociodemográficos en los escolares. La muestra está compuesta por 906 estudiantes de escuelas públicas en Aracaju, Sergipe, Brasil, con una media de 15,11 (SD = 2,19 años de edad. Se utilizó la regresión de Poisson para el cálculo de la tasa de prevalencia (RP y los intervalos de confianza del 95% (IC95%. De los estudiantes encuestados, el 49,1% no practica el fútbol. Los niños con más probabilidades de no jugar al fútbol eran mujeres (RP: 3,28, IC95%: 2,59 a 4,15 y de la escuela secundaria (RP: 1,45, IC95%: 1,10 - 1,92. Casi la mitad de los estudiantes no practican el fútbol y sin importar la edad y el nivel económico, las alumnas y los alumnos de la escuela secundaria probablemente a la práctica en el deporte es aún menor.The objective of this study was to evaluate the association between soccer practice and sociodemographic factors in adolescents. The sample consisted of 906 public school students from Aracaju, Sergipe, Brazil, with a mean age of 15.11 (SD=2.19 years. Poisson regression was used to calculate the prevalence ratio (PR and 95% confidence

Relationship between electrical and structural properties in Pr2/3+xTiO3±y

International Nuclear Information System (INIS)

Kirsanov, N.A.; Bazuev, G.V.

1987-01-01

Synthesis conditions results of X-ray diffraction investigations and electric properties of oxide titanium bronzes (OTB) of praseodymium Pr 2/3+x TiO 3±y in homogeneity region are presented. Change of crystal lattice symmetry in the region of existence of oxide titanium bronzes Pr 2/3+x TiO 3 ± y (O ≤ x ≤ 1/3) was revealed. Specific electrical resistance measurements enabled to conclude that d-electrons of Ti 3+ cations were characterized by collectivized behaviour, conditioned by formation of harrow, partially occupied π*-zone

9 CFR 95.3 - Byproducts from diseased animals prohibited.

Science.gov (United States)

2010-01-01

... 9 Animals and Animal Products 1 2010-01-01 2010-01-01 false Byproducts from diseased animals prohibited. 95.3 Section 95.3 Animals and Animal Products ANIMAL AND PLANT HEALTH INSPECTION SERVICE, DEPARTMENT OF AGRICULTURE EXPORTATION AND IMPORTATION OF ANIMALS (INCLUDING POULTRY) AND ANIMAL PRODUCTS...

Mass spectrometric investigation of neutral and charged constituents in saturated vapor over PrI3

International Nuclear Information System (INIS)

Motalov, V.B.; Vorobiev, D.E.; Kudin, L.S.; Markus, T.

2009-01-01

The Knudsen effusion mass spectrometric technique was used to study vapor species over praseodymium triiodide. The monomer, PrI 3 , and dimer, Pr 2 I 6 , molecules and the negative ions, PrI 4 - and Pr 2 I 7 - , were observed in saturated vapor in the temperature range from 856 K to 1048 K. The partial vapor pressures of neutral constituents were determined and the enthalpies of sublimation obtained using the second and the third laws of thermodynamics (Δ s H deg. (298.15 K) = 291 ± 4 kJ mol -1 for PrI 3 , and Δ s H deg. (298.15 K) = 400 ± 30 kJ mol -1 for Pr 2 I 6 ). The equilibrium constants for various ion molecular reactions were measured and the enthalpies of reactions obtained. The enthalpies of formation, Δ f H deg. (298.15 K) kJ mol -1 , of gaseous molecules and ions were calculated and are as follows: -374 ± 6 (PrI 3 ), -929 ± 30 (Pr 2 I 6 ), -867 ± 30 (PrI 4 - ), -1432 ± 50 (Pr 2 I 7 - )

Thermal expansion and magnetostriction of clathrate compound Pr3Pd20Ge6

Science.gov (United States)

Matsumoto, K.; Sekiguchi, Y.; Iwakami, O.; Ono, T.; Abe, S.; Ano, G.; Akatsu, M.; Mitsumoto, K.; Nemoto, Y.; Goto, T.; Takeda, N.; Kitazawa, H.

2018-03-01

In Pr3Pd20Ge6, the Pr ions are located at two different crystallographic sites, 4a and 8c site. Antiferro-quadrupole ordering (AFQ) of the 8c site occurs at 250 mK. Ac susceptibility measurement indicated that antiferromagnetic ordering (AFM) of the 4a site and Hyperfine-enhanced Pr nuclear magnetic ordering of the 8c site occur at 77 and 9 mK, respectively. To clarify the magnetic and quadrupole properties of Pr3Pd20Ge6, thermal expansion and magnetostriction measurements on single crystal sample were carried out along the [001] direction up to 8 T down to 500 μK using a capacitive dilatometer. In zero field, relative length change ΔL/L in [001] direction had a dip at AFQ and abrupt decrease at AFM ordering. From thermal expansion and isothermal magnetostriction measurements, magnetic phase diagram of Pr3Pd20Ge6 along [001] direction was obtained.

Tungsten ditelluride for a nanosecond Ho,Pr:LiLuF4 laser at 2.95 µm

Science.gov (United States)

Yan, Zhengyu; Li, Tao; Zhao, Jia; Zhao, Shengzhi; Yang, Kejian; Li, Guiqiu; Li, Dechun; Zhang, Shuaiyi; Li, Jian

2018-04-01

The linear and nonlinear absorption characteristics of a home-built multilayer tungsten ditelluride (WTe2) saturable absorber at ~3 µm were demonstrated for the first time. A passively Q-switched Ho,Pr:LiLuF4 laser was realized by inserting the WTe2-saturable absorber into a plane-concave laser cavity. A maximum average output power of 128 mW, with a pulse duration of 366 ns at a repetition rate of 92 kHz was obtained under an absorbed pump power of 3.67 W, corresponding to a pulse energy of 1.4 µJ.

Optimization of Pr3+:ZBLAN fiber amplifiers

DEFF Research Database (Denmark)

Pedersen, B.; Miniscalco, J. W.; Quimby, R. S.

1992-01-01

Experimental parameters have been measured and used in a quantitative model of Pr3+-doped fluorozirconate fiber amplifiers. The optimum cutoff wavelength was determined to be 800 nm and the gain for 400 mW of pump was found to increase from 12 to 34 dB if the NA was increased from 0.15 to 0...

Cs2SO4-Pr2(SO4)3-H2O and NiSO4-Pr2(SO4)3-H2O systems at 75 deg C

International Nuclear Information System (INIS)

Onishchenko, M.K.; Skorikov, V.M.; Shevchuk, V.G.; AN SSSR, Moscow. Inst. Obshchej i Neorganicheskoj Khimii)

1979-01-01

To investigate physico-chemical properties of equilibrium saturated solutions and to elucidate the chemical changes under way, the aqueous systems of cesium, nickel and praseodymium (3) sulfates are studied. The method of isothermal saturation of salts at 75 deg C is used. It has been found that in the system Cs 2 SO 4 -Pr 2 (SO 4 ) 3 -H 2 O in a wide concentration range the soluble binary salt Cs 2 SO 4 xPr 2 (SO 4 ) 3 csytallizes in a congruent way. For the system NiSO 4 -Pr 2 (SO 4 ) 3 -H 2 O a solubility curve of the eutonic type is obtained, there being no chemical interaction between the components. The solubility isotherms for the system are given

Structure and Electrical-Transport Relations in Ba(Zr,Pr)O3-δ Perovskites.

Science.gov (United States)

Antunes, Isabel; Amador, Ulises; Alves, Adriana; Correia, Maria Rosário; Ritter, Clemens; Frade, Jorge Ribeiro; Pérez-Coll, Domingo; Mather, Glenn C; Fagg, Duncan Paul

2017-08-07

Members of the perovskite solid solution BaZr 1-x Pr x O 3-δ (0.2 ≤ x ≤ 0.8) with potential high-temperature electrochemical applications were synthesized via mechanical activation and high-temperature annealing at 1250 °C. Structural properties were examined by Rietveld analysis of neutron powder diffraction and Raman spectroscopy at room temperature, indicating rhombohedral symmetry (space group R3̅c) for members x = 0.2 and 0.4 and orthorhombic symmetry (Imma) for x = 0.6 and 0.8. The sequence of phase transitions for the complete solid solution from BaZrO 3 to BaPrO 3 is Pm3̅m → R3̅c → Imma → Pnma. The structural data indicate that Pr principally exists as Pr 4+ on the B site and that oxygen content increases with higher Pr content. Electrical-conductivity measurements in the temperature range of 250-900 °C in dry and humidified (pH 2 O ≈ 0.03 atm) N 2 and O 2 atmospheres revealed an increase of total conductivity by over 2 orders of magnitude in dry conditions from x = 0.2 to x = 0.8 (σ ≈ 0.08 S cm -1 at 920 °C in dry O 2 for x = 0.8). The conductivity for Pr contents x > 0.2 is attributable to positively charged electronic carriers, whereas for x = 0.2 transport in dry conditions is n-type. The change in conduction mechanism with composition is proposed to arise from the compensation regime for minor amounts of BaO loss changing from predominantly partitioning of Pr on the A site to vacancy formation with increasing Pr content. Conductivity is lower in wet conditions for x > 0.2 indicating that the positive defects are, to a large extent, charge compensated by less mobile protonic species. In contrast, the transport mechanism of the Zr-rich composition (x = 0.2), with much lower electronic conductivity, is essentially independent of moisture content.

Luminescent characteristics of UV excited Sr_0_._5Ca_0_._5TiO_3: Pr"3"+ reddish-orange phosphor

International Nuclear Information System (INIS)

Vidyadharan, Viji; Mohan P, Remya; Joseph, Cyriac; Unnikrishnan, N.V.; Biju, P.R.

2016-01-01

Pr"3"+ doped Sr_0_._5Ca_0_._5TiO_3 phosphors were synthesised by solid state reaction process. The structure, surface morphology and photoluminescence of the prepared phosphors were analysed using XRD, SEM and photoluminescence spectroscopy respectively. The XRD pattern confirmed orthorhombic perovskite structure of the Sr_0_._5Ca_0_._5TiO_3: x Pr"3"+ phosphor. Agglomeration of particles with irregular shapes is observed from the SEM images. The emission spectra of Sr_0_._5Ca_0_._5TiO_3: x Pr"3"+ phosphor shows the samples can be effectively excited with UV light at 336 nm and exhibit a strong reddish-orange emission at 611 nm. Concentration dependence of emission intensity shows concentration quenching effect on increasing Pr"3"+ concentration after x = 0.1 because of dipole–dipole interaction. Using Blasse's formula, critical distance for energy transfer was calculated. The CIE co-ordinates, CCT, colour purity and luminescence decay of the prepared phosphors were also calculated. These results offer the prepared phosphor as a suitable candidate for various photonic applications. - Highlights: • Sr_0_._5Ca_0_._5TiO_3: x Pr"3"+ perovskite structured phosphors were synthesized. • Under UV excitation, the PL spectra show strong reddish-orange emission. • The emission from "3P_J levels of Pr"3"+ were absent due to the presence of IVCT band. • Concentration quenching due to dipole–dipole interaction was observed. • For x = 0.1, sample shows a maximum emission intensity with 91.7% colour purity.

LiY0.3Lu0.7F4: Ce3+,Pr3+ Mixed Crystal as a Perspective Up-Conversionally Pumped UV Active Medium

Directory of Open Access Journals (Sweden)

Gorieva V.G.

2015-01-01

Full Text Available Investigation results of effective population of states of 5d-configuration of Ce3+ ions by energy transfer from Pr3+ ions in LiY0.3Lu0.7F4 (LYLF crystals are discussed. The real concentrations of Pr3+ and Ce3+ ions in LYLF crystals are determined. Such parameters as excited 4f-5d state photoionization cross-section of Pr3+ ions, ground state cross-section of Ce3+ ions at 266 nm wavelengths and energy transfer coefficients of energy transfer from Pr3+ to Ce3+ ions were estimated. The results of pump-probe experiments on 5d-4f transitions of Ce3+ ions in LYLF crystals are presented. The optimal parameters for getting maximal gain on 5d-4f transitions of Ce3+ ions were determined by mathematical modeling.

Thermoluminescent response of LaAlO3:Pr

International Nuclear Information System (INIS)

Morales H, A.; Zarate M, J.; Azorin N, J.; Rivera M, T.

2015-10-01

In this study, the thermoluminescence response of doped lanthanum aluminate (LaAlO 3 ) with praseodymium ion (Pr) obtained by the Pechini method and drying by the spraying technique Spry Dryer was studied. The obtained powders were analyzed structurally by the X-ray diffraction technique; the morphological characterization was by the scanning electron microscopy technique. The obtained powders at 800 degrees C presented crystallinity and showed a Rhombohedral crystal structure, this phase was observed by X-ray diffraction patterns. Thermoluminescence response of LaAlO 3 :Pr showed a brightness curve with a peak centered at 157 degrees C. The sensitivity of the doped samples was improved about 90 times in comparison with the undoped sample. Thermoluminescence response in function of the wavelength showed a maximum at 230 nm, reproducibility of thermoluminescence response was ±50%. Also the fading in thermoluminescence response was studied. (Author)

76 FR 23642 - Culturally Significant Objects Imported for Exhibition Determinations: “Projects 95: Runa Islam”

Science.gov (United States)

2011-04-27

... DEPARTMENT OF STATE [Public Notice: 7433] Culturally Significant Objects Imported for Exhibition Determinations: ``Projects 95: Runa Islam'' SUMMARY: Notice is hereby given of the following determinations... the exhibition ``Projects 95: Runa Islam'' imported from abroad for temporary exhibition within the...

Quasi-homoepitaxial growth of a-axis oriented PrBa sub 2 Cu sub 3 O sub 7 sub - subdelta thick film on (100) YBa sub 2 Cu sub 3 O sub 7 sub - subdelta single crystal

CERN Document Server

Sato, M; Morishita, T

2003-01-01

The structural characterizations of the quasi-homoepitaxial growth of a-axis oriented PrBa sub 2 Cu sub 3 O sub 7 sub - subdelta thick film grown on (100) YBa sub 2 Cu sub 3 O sub 7 sub - subdelta single crystal were investigated in comparison with those of the film grown on (001) YBa sub 2 Cu sub 3 O sub 7 sub - subdelta single crystal. The a-axis oriented PrBa sub 2 Cu sub 3 O sub 7 sub - subdelta films, expected to be a barrier layer, were prepared using a dc-95 MHz hybrid plasma sputtering on (100) and (001) YBa sub 2 Cu sub 3 O sub 7 sub - subdelta single crystals that are superconducting ground planes. The atomic force microscopy image revealed that the surfaces of 700-nm-thick a-axis PrBa sub 2 Cu sub 3 O sub 7 sub - subdelta films on (100) YBa sub 2 Cu sub 3 O sub 7 sub - subdelta single crystals were smooth with a mean roughness of 2.8 nm. X-ray diffraction scans showed that a-axis PrBa sub 2 Cu sub 3 O sub 7 sub - subdelta films deposited on (100) YBa sub 2 Cu sub 3 O sub 7 sub - subdelta single cry...

Isothermal sections of the state diagram for the Pr-Ni-Ge system at 870 (0-0,5Pr) and 670 K (0,5-1Pr)

International Nuclear Information System (INIS)

Fedyna, M.F.; Pecharskij, V.K.; Bodak, O.I.

1987-01-01

Method of X-ray phase and microstructural analyses were used to study Pr-Ni-Ge ternary system at 870K (0-0.50 at.fractions of Pr) and 670K (0.50-1.00 at.fractions of Pr). 11 ternary compounds exist in the system: Pr 1-x (NiGe) 13 (x=0.24), PrNi 2 Ge 2 , Pr 2 Ni 3 Ge 5 , PrNiGe 3 , Pr 2 NiGe 6 , Pr 3 Ni 4 Ge 4 , PrNi (1-x) Ge 2 (x=0.33), PrNiGe, Pr(NiGe) 2-x (x=0.14), Pr 3 NiGe 2 , ∼Pr 5 NiGe 4 . Crystal structure was determined for seven ternary compounds

76 FR 70438 - Enterprise Intrastate L.P., Enterprise Texas Pipeline LLC; Notice of Filing

Science.gov (United States)

2011-11-14

... DEPARTMENT OF ENERGY Federal Energy Regulatory Commission [Docket No. PR12-4-000; Docket No. PR12-5-000; Not Consolidated] Enterprise Intrastate L.P., Enterprise Texas Pipeline LLC; Notice of Filing Take notice that on November 1, 2011, the applicants listed above filed a revised Statement of...

Photoluminescent properties of Pr3+ doped YTiAO6 (A= Nb&Ta) euxenite compounds

Science.gov (United States)

Venugopal, Meenu; Kumar, H. Padma

2018-04-01

Pr3+ doped YTiAO6 (A = Nb and Ta) compounds were prepared by conventional solid state ceramic route. X - ray diffraction studies of the samples confirmed the euxenite orthorhombic phase formation. Effect of Pr3+ doping on the optical and luminescence properties of YTiAO6 (A = Nb and Ta) were studied. The strong absorption in the UV region are due to the absorption by the host YTiAO6 (A = Nb and Ta) and all other peaks can be attributed to that of Pr3+. Host emission peaks are observed around 485 nm and 460 nm in all samples. The red emission observed at 614 nm in the doped samples corresponds to the 1D2 to 3H4 transition of Pr3+ ion. CIE colour coordinates and chromaticity values were also discussed.

Magnetic interactions in praseodymium ruthenate Pr{sub 3}RuO{sub 7} with fluorite-related structure

Energy Technology Data Exchange (ETDEWEB)

Inabayashi, Masaki; Doi, Yoshihiro; Wakeshima, Makoto; Hinatsu, Yukio, E-mail: hinatsu@sci.hokudai.ac.jp

2017-06-15

Solid solutions Pr{sub 3}(Ru{sub 1-x}Ta{sub x})O{sub 7} (0≤x≤1.0) and (Pr{sub 1-x}Y{sub x}){sub 3}RuO{sub 7} (0≤x≤0.7) were obtained as a single phase compound. They crystallize in an orthorhombic superstructure derived from that of the cubic fluorite with space group Cmcm. The results of the Rietveld analysis for X-ray diffraction profiles of Pr{sub 3}(Ru{sub 1-x}Ta{sub x})O{sub 7} showed that Ru and Ta atoms are randomly situated at the six-coordinate 4b site. For (Pr{sub 1-x}Y{sub x}){sub 3}RuO{sub 7}, with increasing the concentration of Y ions (x value), the smaller Y ions occupy selectively the seven-coordinate 8g site rather than the eight-coordinate 4a site. Through magnetic susceptibility measurements for Pr{sub 3}(Ru{sub 1-x}Ta{sub x})O{sub 7}, the antiferromagnetic transition temperatures decrease linearly with increasing x value, and at x=0.75 no magnetic ordering was found down to 1.8 K, indicating the magnetic interaction is not one-dimensional, but three-dimensional. On the other hand, the antiferromagnetic transition temperature for (Pr{sub 1-x}Y{sub x}){sub 3}RuO{sub 7} decreases with increasing x value, but above x≥0.50 it becomes constant (~12 K). This result indicates that Pr{sup 3+} ions at the seven-coordinate site greatly contribute to the antiferromagnetic interactions observed in (Pr{sub 1-x}Y{sub x}){sub 3}RuO{sub 7}. Density functional calculations of Pr{sub 3}RuO{sub 7} demonstrate that the electronic structure gives insulating character and that oxygen 2p orbitals hybridize strongly with Ru 4d orbitals in the valence band (VB). Near the top of VB, the Pr 4 f orbitals at the seven-coordinated site also show a weak hybridization with the O(1) 2p orbitals. The Ru-O(1)-Pr superexchange pathway take part in three-dimensional magnetic interaction and play an important role in an enhancement of long-range magnetic ordering. - Graphical abstract: The spin densities and the spin polarization of Pr{sub 3}RuO{sub 7} are shown

Electrical PR Interval Variation Predicts New Occurrence of Atrial Fibrillation in Patients With Frequent Premature Atrial Contractions.

Science.gov (United States)

Chun, Kwang Jin; Hwang, Jin Kyung; Park, Seung-Jung; On, Young Keun; Kim, June Soo; Park, Kyoung-Min

2016-04-01

Atrial fibrillation (AF) is associated with the autonomic nervous system (ANS), and fluctuation of autonomic tone is more prominent in patients with AF. As autonomic tone affects the heart rate (HR), and there is an inverse relationship between HR and PR interval, PR interval variation could be greater in patients with AF than in those without AF. The purpose of this study was to investigate the correlation between PR interval variation and new-onset AF in patients with frequent PACs.We retrospectively enrolled 207 patients with frequent PACs who underwent electrocardiographs at least 4 times during the follow-up period. The PR variation was calculated by subtracting the minimum PR interval from the maximum PR interval. The outcomes were new occurrence of AF and all-cause mortality during the follow-up period.During a median follow-up of 8.3 years, 24 patients (11.6%) developed new-onset AF. Univariate analysis showed that prolonged PR interval (PR interval > 200 ms, P = 0.021), long PR variation (PR variation > 36.5 ms, P = 0.018), and PR variation (P = 0.004) as a continuous variable were associated with an increased risk of AF. Cox regression analysis showed that prolonged PR interval (hazard ratio = 3.321, 95% CI 1.064-10.362, P = 0.039) and PR variation (hazard ratio = 1.013, 95% CI 1.002-1.024, P = 0.022) were independent predictors for new-onset AF. However, PR variation and prolonged PR interval were not associated with all-cause mortality (P = 0.465 and 0.774, respectively).PR interval variation and prolonged PR interval are independent risk factors for new-onset AF in patients with frequent PACs. However we were unable to determine a cut-off value of PR interval variation for new-onset AF.

Critical Scattering in the Singlet-Ground State System Pr3TI

DEFF Research Database (Denmark)

Als-Nielsen, Jens Aage; Kjems, Jørgen; Buyers, W. J. L.

1977-01-01

A central mode in the ferromagnetic phase transition of Pr3T1 is observed by inelastic and quasielastic neutron scattering. The intensity, assuming a Lorentzian wave vector dependence, has a correlation range parameter that is much larger than in ordinary ferromagnets.......A central mode in the ferromagnetic phase transition of Pr3T1 is observed by inelastic and quasielastic neutron scattering. The intensity, assuming a Lorentzian wave vector dependence, has a correlation range parameter that is much larger than in ordinary ferromagnets....

75 FR 65467 - Enterprise Alabama Intrastate, LLC; Enterprise Intrastate L.P; Notice of Baseline Filings

Science.gov (United States)

2010-10-25

... DEPARTMENT OF ENERGY Federal Energy Regulatory Commission [Docket No. PR11-4-000; Docket No. PR11-5-000; Not Consolidated] Enterprise Alabama Intrastate, LLC; Enterprise Intrastate L.P; Notice of Baseline Filings October 18, 2010. Take notice that on October 15, 2010, the applicants listed above...

PR-EDB: Power Reactor Embrittlement Database Version 3

International Nuclear Information System (INIS)

Wang, Jy-An John; Subramani, Ranjit

2008-01-01

The aging and degradation of light-water reactor pressure vessels is of particular concern because of their relevance to plant integrity and the magnitude of the expected irradiation embrittlement. The radiation embrittlement of reactor pressure vessel materials depends on many factors, such as neutron fluence, flux, and energy spectrum, irradiation temperature, and preirradiation material history and chemical compositions. These factors must be considered to reliably predict pressure vessel embrittlement and to ensure the safe operation of the reactor. Large amounts of data from surveillance capsules are needed to develop a generally applicable damage prediction model that can be used for industry standards and regulatory guides. Furthermore, the investigations of regulatory issues such as vessel integrity over plant life, vessel failure, and sufficiency of current codes, Standard Review Plans (SRPs), and Guides for license renewal can be greatly expedited by the use of a well-designed computerized database. The Power Reactor Embrittlement Database (PR-EDB) is such a comprehensive collection of data for U.S. designed commercial nuclear reactors. The current version of the PR-EDB lists the test results of 104 heat-affected-zone (HAZ) materials, 115 weld materials, and 141 base materials, including 103 plates, 35 forgings, and 3 correlation monitor materials that were irradiated in 321 capsules from 106 commercial power reactors. The data files are given in dBASE format and can be accessed with any personal computer using the Windows operating system. 'User-friendly' utility programs have been written to investigate radiation embrittlement using this database. Utility programs allow the user to retrieve, select and manipulate specific data, display data to the screen or printer, and fit and plot Charpy impact data. The PR-EDB Version 3.0 upgrades Version 2.0. The package was developed based on the Microsoft .NET framework technology and uses Microsoft Access for

PR-EDB: Power Reactor Embrittlement Database - Version 3

Energy Technology Data Exchange (ETDEWEB)

Wang, Jy-An John [ORNL; Subramani, Ranjit [ORNL

2008-03-01

The aging and degradation of light-water reactor pressure vessels is of particular concern because of their relevance to plant integrity and the magnitude of the expected irradiation embrittlement. The radiation embrittlement of reactor pressure vessel materials depends on many factors, such as neutron fluence, flux, and energy spectrum, irradiation temperature, and preirradiation material history and chemical compositions. These factors must be considered to reliably predict pressure vessel embrittlement and to ensure the safe operation of the reactor. Large amounts of data from surveillance capsules are needed to develop a generally applicable damage prediction model that can be used for industry standards and regulatory guides. Furthermore, the investigations of regulatory issues such as vessel integrity over plant life, vessel failure, and sufficiency of current codes, Standard Review Plans (SRPs), and Guides for license renewal can be greatly expedited by the use of a well-designed computerized database. The Power Reactor Embrittlement Database (PR-EDB) is such a comprehensive collection of data for U.S. designed commercial nuclear reactors. The current version of the PR-EDB lists the test results of 104 heat-affected-zone (HAZ) materials, 115 weld materials, and 141 base materials, including 103 plates, 35 forgings, and 3 correlation monitor materials that were irradiated in 321 capsules from 106 commercial power reactors. The data files are given in dBASE format and can be accessed with any personal computer using the Windows operating system. "User-friendly" utility programs have been written to investigate radiation embrittlement using this database. Utility programs allow the user to retrieve, select and manipulate specific data, display data to the screen or printer, and fit and plot Charpy impact data. The PR-EDB Version 3.0 upgrades Version 2.0. The package was developed based on the Microsoft .NET framework technology and uses Microsoft Access for

MoTe2 saturable absorber for passively Q-switched Ho,Pr:LiLuF4 laser at ∼3 μm

Science.gov (United States)

Yan, Zhengyu; Li, Tao; Zhao, Shengzhi; Yang, Kejian; Li, Dechun; Li, Guiqiu; Zhang, Shuaiyi; Gao, Zijing

2018-03-01

Multilayer molybdenum ditelluride (MoTe2) nanosheets were prepared by liquid-phase exfoliation (LPE) method. A YAG-based MoTe2 saturable absorption (SA) was consequently fabricated. The MoTe2-SA was employed in a passively Q-switched Ho,Pr:LiLuF4 laser at 2.95 μm. Under the absorbed pump power of 3.8 W, an average output power of 90 mW was achieved. The shortest pulse duration of 670 ns was generated with an output power of 73 mW and a repetition rate of 76.46 kHz, corresponding to a pulse energy of 0.95 μJ.

Photon Echoes in the 3P0 ← 3H4 Transition of Pr3+/LaF3

NARCIS (Netherlands)

Morsink, Jos B.W.; Wiersma, Douwe A.

1979-01-01

Photon-echo quantum beats observed in the two-pulse and three-pulse photon echo of the 3P0 ← 3H4 transition in Pr3+/LaF3 were used to determine the excited-state spin-hamiltonian. In addition we report on the anomalous stimulated photon echo observed in the same transition which in a magnetic field

Effects of Ce3+ concentration, beam voltage and current on the cathodoluminescence intensity of SiO2: Pr3+–Ce3+ nanophosphor

CSIR Research Space (South Africa)

Mhlongo, GH

2011-02-01

Full Text Available SiO2:Pr3+–Ce3+ phosphor powders were successfully prepared using a sol–gel process. The concentration of Pr3+ was fixed at 0.2 mol% while that of Ce3+ was varied in the range of 0.2–2 mol%. High resolution transmission electron microscopy (HRTEM...

Photoemission of heavy fermion superconductor PrOs4Sb12 and other Pr compounds

International Nuclear Information System (INIS)

Imada, S.; Yamasaki, A.; Sekiyama, A.; Settai, R.; Onuki, Y.; Suga, S.; Sugawara, H.; Sato, H.; Ochiai, A.

2004-01-01

Full text: Strongly correlated electronic states due to Pr 4f electrons found in several Pr compounds have recently been attracting much attention. The Pr 4f electrons are much more localized than in Ce due to the lanthanoid contraction. Therefore, the number of the Pr systems that show strong electron correlation is much smaller than Ce systems. We will present a comparative study of Pr 4f electronic states in such systems as the heavy fermion superconductor PrOs 4 Sb 12 , the Kondo system PrSn 3 and the localized 4f systems Pr 4 X 3 (X = Sb and Bi). The Pr 4f electronic state was probed by means of the Pr 3d → 4f resonant photoemission (RPES). Because the kinetic energy (E K ) of the photoelectrons is as high as ∼ 900 eV, this method is much more bulk sensitive than the 4d → 4f RPES with E K ∼ 100 eV. The energy resolution could be set to about 100 meV by utilizing the soft X-rays from BL25SU in SPring-8 and the SCIENTA SES-200 analyzer. The Pr 4f excitation spectrum of PrSn 3 was found to show a very strong intensity at the Fermi level (E F ). This can be interpreted as the Kondo resonance which has been observed in the Kondo Ce and Yb compounds. In the Pr 4f spectrum of the heavy fermion superconductor PrOs 4 Sb 12 , the intensity at E F was smaller than in PrSn 3 . This clearly shows that the Kondo temperature (T K ) is much lower in PrOs 4 Sb 12 than in PrSn 3 . We have further found a strong excitation energy dependence in the RPES line shape. In the case of Pr 4 X 3 (X = Sb and Bi), the intensity at E B was much smaller than PrSn 3 and PrOs 4 Sb 12 , which is consistent with the localized character of Pr 4f electrons in Pr 4 X 3 . The Pr 4f spectra of these localized systems are qualitatively well reproduced by a cluster model calculation that takes into account the hybridization between the Pr 4f orbital and the conduction and valence bands made up by the X p and Pr 5d states

Synthesis and crystal structure of the isotypic rare earth thioborates Ce[BS3], Pr[BS3], and Nd[BS3

International Nuclear Information System (INIS)

Hunger, Jens; Borna, Marija; Kniep, Ruediger

2010-01-01

The orthothioborates Ce[BS 3 ], Pr[BS 3 ] and Nd[BS 3 ] were prepared from mixtures of the rare earth (RE) metals together with amorphous boron and sulfur summing up to the compositions CeB 3 S 6 , PrB 5 S 9 and NdB 3 S 6 . The following preparation routes were used: solid state reactions with maximum temperatures of 1323 K and high-pressure high-temperature syntheses at 1173 K and 3 GPa. Pr[BS 3 ] and Nd[BS 3 ] were also obtained from rare earth chlorides RECl 3 and sodium thioborate Na 2 B 2 S 5 by metathesis type reactions at maximum temperatures of 1073 K. The crystal structure of the title compounds was determined from X-ray powder diffraction data. The thioborates are isotypic and crystallize in the orthorhombic spacegroup Pna2 1 (No. 33; Z=4; Ce: a=7.60738(6)A, b=6.01720(4)A, c=8.93016(6)A; Pr: a=7.56223(4)A, b=6.00876(2)A, c=8.89747(4)A; Nd: a=7.49180(3)A, b=6.00823(2)A, c=8.86197(3)A) . The crystal structures contain isolated [BS 3 ] 3- groups with boron in trigonal-planar coordination. The sulfur atoms form the vertices of undulated kagome nets, which are stacked along [100] according to the sequence ABAB. Within these nets every second triangle is occupied by boron and the large hexagons are centered by rare earth ions, which are surrounded by overall nine sulfur species. - Abstract: Graphical Abstract Legend (TOC Figure): Table of Contents Figure The isotypic orthothioborates Ce[BS 3 ], Pr[BS 3 ] and Nd[BS 3 ] were prepared using different preparation routes. The crystal structure of the title compounds was determined from X-ray powder diffraction data. The crystal structures contain isolated [BS 3 ] 3- groups with boron in trigonal-planar coordination. The sulfur atoms form the vertices of corrugated kagome nets (sketched with blue dotted lines), which are stacked along [100] according to the sequence ABAB. Within these nets every second triangle is occupied by boron and the large hexagons are centered by rare earth ions, which are surrounded by

The analysis of strain of giant magnetoresistive Pr0.7Sr0.3MnO3/La0.5Ca0.5MnO3/Pr0.7Sr0.3MnO-3 trilayers

International Nuclear Information System (INIS)

Wang Haiou; Liu Hao; Dai Ping; Tan Weishi; Wu Xiaoshan; Jia Quanjie; Li Xiaolong

2012-01-01

Pr 0.7 Sr 0.3 MnO 3 /La 0.5 Ca 0.5 MnO 3 /Pr 0.7 Sr 0.3 MnO 3 (PSMO/LCMO/PSMO) trilayers were deposited on (001)-oriented single crystal MgO by pulsed laser deposition. The thickness of both PSMO layers was 36 nm while the thickness of LCMO layer was 6, 12, 18, 24, 30 and 36 nm, respectively. Out-of-plane and in-plane lattice parameters of trilayers were obtained by using symmetric scanning and asymmetric scanning mode of high resolution X-ray diffraction. Strain states of trilayers have been studied. The results showed that strain relaxation states of trilayers were decided by bulk strain and Jahn-Teller (JT) strain together: The mechanism for strain relaxation in trilayers is different from that for tetragonal distortion. The competition between bulk strain and Jahn-Teller (JT) strain played an important role in the magnetotransport and magnetic properties of trilayers. (authors)

Influence of the valence states of atoms on conducting properties of PrBa2Cu3O6+x

International Nuclear Information System (INIS)

Romanenko, A.I.; Zakharchuk, N.F.; Naumov, N.G.; Fedorov, V.E.; Paek, U.H.

1997-01-01

Pr 3+ valent state only was discovered in PrBa 2 Cu 3 O 6+x within the oxygen content range 0.4 ≤ x ≤ 0.6. Out of this range, Pr 4+ state appears also. All the samples obtained showed insulating behavior of resistivity r(T). In PrBa 2 Cu 3 O 6+x (0.4 ≤ x ≤ 0.6), the resistivity is Mott variable-range hopping conduction type and is connected with oxygen disorder only. Out of this range, the localization is much stronger; this increase is due to Pr 4+ /Pr 3+ position disorder. Also, the localization decreases after annealing at room temperature is the result of ordering. Thus, the absence of metallic (and therefore superconducting) state in PrBa 2 Cu 3 O 6+x is due to the presence of both Pr 4+ and Pr 4+ /Pr 3+ disorder

Magnetic properties in the vortex state of Pr1-xNdxPt4Ge12 and PrPt3.88Fe0.12Ge12 superconductors

Science.gov (United States)

Chandra, L. S. Sharath; Chattopadhyay, M. K.

2018-03-01

We report the temperature and magnetic field dependence of magnetization of Pr1-xNdxPt4Ge12 (x = 0, 0.05 and 0.1) and PrPt3.88Fe0.12Ge12 below 10 K and up to 2 T magnetic field. When compared to the parent PrPt4Ge12, while the critical current density and flux pinning properties are enhanced in the Pr1-xNdxPt4Ge12 samples, they are considerably diminished in the PrPt3.88Fe0.12Ge12 sample. We argue that the observed changes are related to the way the substituting atoms at different crystallographic sites influence the superconductivity in these Germanide skutterudites.

Photorefractive grating formation in piezoelectric La3Ga5SiO14:Pr3+ crystals

DEFF Research Database (Denmark)

Dam-Hansen, C.; Johansen, P.M.; Fridkin, V.M.

1996-01-01

Photorefractive grating formation and erasure in piezoelectric crystals of La3Ga5SiO14:Pr3+ are presented. The specific photoconductivity and the photorefractive sensitivity are determined. The polarization dependence of the grating formation due to the bulk photovoltaic effect is shown and compa......Photorefractive grating formation and erasure in piezoelectric crystals of La3Ga5SiO14:Pr3+ are presented. The specific photoconductivity and the photorefractive sensitivity are determined. The polarization dependence of the grating formation due to the bulk photovoltaic effect is shown...... and compared favorably with the theoretical expression. This photorefractive material provides a possibility for separate investigations of the charge migration processes responsible for the photorefractive effect. (C) 1996 American Institute of Physics....

Conhecimentos, atitudes e práticas acerca da detecção do câncer de próstata Conocimientos, actitudes y prácticas acerca de la detección del cáncer de próstata Knowledge, attitudes and practices regarding the detection of prostate cancer

Directory of Open Access Journals (Sweden)

Elenir Pereira de Paiva

2010-01-01

Full Text Available OBJETIVO: Analisar conhecimentos, atitudes e práticas em relação ao câncer de próstata de homens com idade entre 50 e 80 anos, adstritos à uma unidade do PSF no Município de Juiz de Fora - MG. MÉTODOS: Estudo seccional realizado por meio de inquérito domiciliar abrangendo amostra aleatória de 160 homens residentes em área adscrita desse programa. RESULTADOS: Da amostra, 69,4% eram casados, 88,8% tinham filhos, 86,3% informaram utilizar o PSF, 63,8% apresentaram conhecimento, 40,6% atitudes e 28,1% práticas adequadas. Os homens com conhecimento adequado tiveram prevalência 7,6 vezes (IC 95%=2,4-23,6 mais elevada de referir práticas adequadas. Aqueles com atitudes adequadas tiveram prevalência quase 2 vezes maior (RP=1,8; IC=1,1-3,0 de referir práticas adequadas. CONCLUSÃO: Este estudo corrobora a prevenção e a detecção precoce, como estratégias básicas para o controle do câncer de próstata, e têm como requisito essencial um conjunto de atividades educativas constantes, persistentes e dinâmicas para os homens.OBJETIVO: Analizar conocimientos, actitudes y prácticas en relación al cáncer de próstata de hombres con edad entre 50 y 80 años, inscritos en la una unidad del PSF en el Municipio de Juiz de Fora - MG. MÉTODOS: Estudio seccional realizado por medio de encuesta domiciliar abarcando una muestra aleatoria de 160 hombres residentes en área adscrita a ese programa. RESULTADOS: De la muestra, 69,4% eran casados, 88,8% tenían hijos, 86,3% informaron utilizar el PSF, 63,8% presentaron conocimiento, 40,6% actitudes y 28,1% prácticas adecuadas. Los hombres con conocimiento adecuado tuvieron incidencia 7,6 veces (IC 95%=2,4-23,6 más elevada de referir prácticas adecuadas. Aquellos con actitudes adecuadas tuvieron incidencia casi 2 veces mayor (RP=1,8; IC=1,1-3,0 de referir prácticas adecuadas. CONCLUSIÓN: Este estudio corrobora la prevención y la detección precoz, como estrategias básicas para el control del c

76 FR 8725 - Notice of Baseline Filings

Science.gov (United States)

2011-02-15

... DEPARTMENT OF ENERGY Federal Energy Regulatory Commission Notice of Baseline Filings Enstor Grama Ridge Storage and Docket No. PR10-97-002. Transportation, L.L.C.. EasTrans, LLC Docket No. PR10-30-001... revised baseline filing of their Statement of Operating Conditions for services provided under section 311...

Optical analysis of RE(3+) (RE = Pr(3) (+) , Er(3) (+) and Nd(3) (+) ):cadmium lead boro tellurite glasses.

Science.gov (United States)

Giridhar, P; Bhushana Reddy, M; Neelima, G; Ramanaiah, R; Nagamuni Reddy, K; Sahadeva Reddy, V; Sudhakar Reddy, B

2016-09-01

This article reports on the optical characterization of Pr(3) (+) -, Er(3) (+) - and Nd(3) (+) -doped cadmium lead boro tellurite (CLBT) glasses prepared using the melt quenching method. The visible-near infrared (Vis-NIR) absorption spectra of these glasses were analyzed systematically. On measuring the NIR emission spectra of Er(3) (+) :CLBT glasses, a broad emission band centered at 1536 nm ((4) I13 /2  → (4) I15 /2 ) was observed, as were three NIR emission bands at 900 nm ((4) F3 /2  → (4) I9 /2 ), 1069 nm ((4) F3 /2  → (4) I11 /2 ) and 1338 nm ((4) F3 /2  → (4) I13 /2 ) from Nd(3) (+) :CLBT glasses and an NIR emission band at 1334 nm ((1) G4  → (3) H5 ) from Pr(3) (+) :CLBT glasses at an excitation wavelength (λex ) of 514.5 nm (Ar(+) laser). Copyright © 2016 John Wiley & Sons, Ltd. Copyright © 2016 John Wiley & Sons, Ltd.

Luminescence, scintillation, and energy transfer in SiO{sub 2}-Al{sub 2}O{sub 3}-B{sub 2}O{sub 3}-Gd{sub 2}O{sub 3}:Ce{sup 3+},Pr{sup 3+} glasses

Energy Technology Data Exchange (ETDEWEB)

Lertloypanyachai, Prapon; Chewpraditkul, Weerapong; Pattanaboonmee, Nakarin [Department of Physics, King Mongkut' s University of Technology Thonburi, Bangkok (Thailand); Chen, Danping [Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai (China); Babin, Vladimir; Beitlerova, Alena; Nikl, Martin [Institute of Physics, AS CR, Prague (Czech Republic)

2017-09-15

Ce{sup 3+},Pr{sup 3+}-codoped SiO{sub 2}-Al{sub 2}O{sub 3}-B{sub 2}O{sub 3}-Gd{sub 2}O{sub 3} glasses (SABG:Ce,Pr) were prepared by melt quenching under a CO reducing atmosphere. Luminescence properties were investigated under UV and X-ray excitations. A dominant emission band at 430 nm belonging to the Ce{sup 3+}:5d{sub 1} → 4f transition was observed in the photo- and radio-luminescence spectra. The energy transfer occurs from this Ce{sup 3+} band toward the {sup 3}P{sub J} levels of Pr{sup 3+} with an efficiency of up to 24%, followed by the reduction of integrated luminescence intensity with an increasing Pr{sup 3+} concentration. This result is attributed to the increase in the reabsorption of Ce{sup 3+} luminescence and the non-radiative energy transfer toward the {sup 3}P{sub J} levels of Pr{sup 3+}. The cross-relaxation process within the Pr{sup 3+} pairs can further diminish the total luminescence yield at high Pr{sup 3+} concentrations. The integral scintillation efficiency and light yield measurements were carried out and compared to the reference Bi{sub 4}Ge{sub 3}O{sub 12} (BGO) crystal. (copyright 2017 WILEY-VCH Verlag GmbH and Co. KGaA, Weinheim)

A simple localized-itinerant model for PrAl3: crystal field and exchange effects

International Nuclear Information System (INIS)

Ranke, P.J. von; Palermo, L.

1990-01-01

We present a simple magnetic model for PrAl sub(3). The effects of crystal field are treated using a reduced set of levels and the corresponding wave functions are extracted from the actual crystal field levels of Pr sup(+3) in a hexagonal symmetry. The exchange between 4f- and conduction electrons are dealt within a molecular field approximation. An analytical magnetic state equation is derived and the magnetic behaviour discussed. The parameters of the model are estimated from a fitting of the inverse susceptibility of PrAl sub(3) given in the literature. (author)

Diversity of PR3-ANCA epitope specificity in Wegener's granulomatosis. Analysis using the biosensor technology

NARCIS (Netherlands)

Rarok, Agnieszka; van der Geld, Y.M.; Stegeman, Coen; Limburg, Piet; Kallenberg, Cees

Wegener's granulomatosis is a systemic disease characterized by the presence of antineutrophil cytoplasm autoantibodies specific for proteinase 3 (PR3-ANCA). The functional characteristics of PR3-ANCA differ between quiescent and active disease, suggesting changes in the properties of the

Heregulin Co-opts PR Transcriptional Action Via Stat3 Role As a Coregulator to Drive Cancer Growth.

Science.gov (United States)

Proietti, Cecilia J; Izzo, Franco; Díaz Flaqué, María Celeste; Cordo Russo, Rosalía; Venturutti, Leandro; Mercogliano, María Florencia; De Martino, Mara; Pineda, Viviana; Muñoz, Sergio; Guzmán, Pablo; Roa, Juan C; Schillaci, Roxana; Elizalde, Patricia V

2015-10-01

Accumulated findings have demonstrated the presence of bidirectional interactions between progesterone receptor (PR) and the ErbB family of receptor tyrosine kinases signaling pathways in breast cancer. We previously revealed signal transducer and activator of transcription 3 (Stat3) as a nodal convergence point between said signaling pathways proving that Stat3 is activated by one of the ErbBs' ligands, heregulin (HRG)β1 via ErbB2 and through the co-option of PR as a signaling molecule. Here, we found that HRGβ1 induced Stat3 recruitment to the promoters of the progestin-regulated cell cycle modulators Bcl-XL and p21(CIP1) and also stimulated Stat3 binding to the mouse mammary tumor virus promoter, which carries consensus progesterone response elements. Interestingly, HRGβ1-activated Stat3 displayed differential functions on PR activity depending on the promoter bound. Indeed, Stat3 was required for PR binding in bcl-X, p21(CIP1), and c-myc promoters while exerting a PR coactivator function on the mouse mammary tumor virus promoter. Stat3 also proved to be necessary for HRGβ1-induced in vivo tumor growth. Our results endow Stat3 a novel function as a coregulator of HRGβ1-activated PR to promote breast cancer growth. These findings underscore the importance of understanding the complex interactions between PR and other regulatory factors, such as Stat3, that contribute to determine the context-dependent transcriptional actions of PR.

Heregulin Co-opts PR Transcriptional Action Via Stat3 Role As a Coregulator to Drive Cancer Growth

Science.gov (United States)

Izzo, Franco; Díaz Flaqué, María Celeste; Cordo Russo, Rosalía; Venturutti, Leandro; Mercogliano, María Florencia; De Martino, Mara; Pineda, Viviana; Muñoz, Sergio; Guzmán, Pablo; Roa, Juan C.; Schillaci, Roxana

2015-01-01

Accumulated findings have demonstrated the presence of bidirectional interactions between progesterone receptor (PR) and the ErbB family of receptor tyrosine kinases signaling pathways in breast cancer. We previously revealed signal transducer and activator of transcription 3 (Stat3) as a nodal convergence point between said signaling pathways proving that Stat3 is activated by one of the ErbBs' ligands, heregulin (HRG)β1 via ErbB2 and through the co-option of PR as a signaling molecule. Here, we found that HRGβ1 induced Stat3 recruitment to the promoters of the progestin-regulated cell cycle modulators Bcl-XL and p21CIP1 and also stimulated Stat3 binding to the mouse mammary tumor virus promoter, which carries consensus progesterone response elements. Interestingly, HRGβ1-activated Stat3 displayed differential functions on PR activity depending on the promoter bound. Indeed, Stat3 was required for PR binding in bcl-X, p21CIP1, and c-myc promoters while exerting a PR coactivator function on the mouse mammary tumor virus promoter. Stat3 also proved to be necessary for HRGβ1-induced in vivo tumor growth. Our results endow Stat3 a novel function as a coregulator of HRGβ1-activated PR to promote breast cancer growth. These findings underscore the importance of understanding the complex interactions between PR and other regulatory factors, such as Stat3, that contribute to determine the context-dependent transcriptional actions of PR. PMID:26340407

State diagram of Pr-Bi system

International Nuclear Information System (INIS)

Abulkhaev, V.L.; Ganiev, I.N.

1994-01-01

By means of thermal differential analysis, X-ray and microstructural analysis the state diagram of Pr-Bi system was studied. Following intermetallic compounds were defined in the system: Pr 2 Bi, Pr 5 Bi 3 , Pr 4 Bi 3 , Pr Bi, PrBi 2 , Pr 2 Bi, Pr 5 Bi 3 , Pr 4 Bi 3 and PrBi 2 . The data analysis on Ln-Bi diagram allowed to determine the regularity of change of properties of intermetallic compounds in the line of rare earth elements of cerium subgroup.

40 CFR 141.204 - Tier 3 Public Notice-Form, manner, and frequency of notice.

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2010-07-01

... 40 Protection of Environment 22 2010-07-01 2010-07-01 false Tier 3 Public Notice-Form, manner, and frequency of notice. 141.204 Section 141.204 Protection of Environment ENVIRONMENTAL PROTECTION AGENCY...., house renters, apartment dwellers, university students, nursing home patients, prison inmates, etc...

Optical characterization of Pr3+-doped yttria-stabilized zirconia single crystals

International Nuclear Information System (INIS)

Savoini, B.; Munoz Santiuste, J.E.; Gonzalez, R.

1997-01-01

The optical absorption and fluorescence of Pr 3+ ions in yttria-stabilized zirconia single crystals are investigated. Fluorescence emissions from the 1 D 2 level are clearly dominant and low intensity emission lines from the 3 P 0 and 1 G 4 states are also observed. Analysis with the Judd-Ofelt theory of the absorption intensities has been made assuming that only ∼40% of the praseodymium ions contribute to the optical absorption bands. Quantum efficiency values of η( 3 P 0 )∼0.2 and η( 1 D 2 )∼ 1 are obtained at room temperature. 1 D 2 fluorescence quenching has been observed in heavily-doped samples due to cross relaxation processes among neighboring Pr 3+ ions. Analysis using the Inokuti-Hirayama model shows that electric dipole-dipole interactions are mainly responsible for the quenching effect. Pr 3+ ions are present in seven and sixfold configurations with a statistical distribution. The energy position of the 4f5d configuration is very different for each center. The fluorescence dynamics is explained by a mechanism involving thermally assisted population of the 3 P 1,2 + 1 I 6 upper levels and fast relaxation to the 1 D 2 level via states of the excited 4f5d configuration. copyright 1997 The American Physical Society

Electronic structures of PrBa2Cu3O7, Pr2Ba4Cu7O15-y(y=0,1), and PrBa2Cu4O8 based on LSDA+U method

International Nuclear Information System (INIS)

Tavana, A.; Shirazi, M.; Akhavan, M.

2009-01-01

The electronic structures of PrBa 2 Cu 3 O 7 (Pr123), Pr 2 Ba 4 Cu 7 O 15-y (Pr247), and PrBa 2 Cu 4 O 8 (Pr124) cuprates have been obtained using density-functional theory in the local spin density approximation plus onsite Coulomb interaction (LSDA+U). Onsite Hubbard correlation, U, has been considered for Pr-f and Cu-d orbitals and the effects of considering these correlation corrections on the Pr-O hybridizations have been inspected. Results imply that the Pr ionization state in Pr123 system is constituted from two different configurations, and the energy of the f states in these two configurations has an important role in superconductivity properties of the system. Our calculations also show that in both Pr124 and Pr247 systems, suppression of superconductivity is weaker than that in the Pr123 system. This occurs due to the weaker Pr-O bond in both Pr124 and Pr247 systems. The role of the double chain and single chain on the conduction properties of these compounds has been investigated. We have also studied the effect of oxygen deficiency in Pr247 system, which seems to revive superconductivity in this system. Investigating the hole carriers in the CuO 2 plane shows a correlation between superconductivity suppression and hole decrement in the planes. (Abstract Copyright [2009], Wiley Periodicals, Inc.)

76 FR 16398 - Combined Notice of Filings #3

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2011-03-23

.... Applicants: Bangor Hydro Electric Company. Description: Bangor Hydro Electric Company submits tariff filing... DEPARTMENT OF ENERGY Federal Energy Regulatory Commission Combined Notice of Filings 3 Take notice that the Commission received the following electric rate filings: Docket Numbers: ER10-2288-004...

Comparison of the luminescent properties of Lu3Al5O12:Pr crystals and films under synchrotron radiation excitation

International Nuclear Information System (INIS)

Zorenko, Yu.; Gorbenko, V.; Zorenko, T.; Voznyak, T.; Nizankovskiy, S.

2016-01-01

The work is dedicated to comparative investigation of the luminescent properties of Lu 3 Al 5 O 12 :Pr(LuAG:Pr) single crystals and single crystalline films using excitation by synchrotron radiation with an energy of 3.7–25 eV in the exciton range of LuAG host. We have found that the differences in the excitation spectra and luminescence decay kinetics of LuAG:Pr crystals and films are caused by involving the LuAl antisite defects and oxygen vacancies in the crystals and Pb 2+ flux related dopants in the films in the excitation processes of the Pr 3+ luminescence. Taking into account these differences, we have determined the energy structure of the Pr 3+ ions in LuAG host and estimated the differences in the energies of creation of excitons bound with the isolated Pr 3+ ions in LuAG:Pr films and the dipole Pr–LuAl antisite defect centers in the crystal counterpart. - Highlights: • Comparison of the luminescent properties of LuAG:Pr single crystals and films. • Superposition of the Pr 3+ and defect centers luminescence of LuAG:Pr crystal. • Different creation energies of an excitons bound with the Pr 3+ in LuAG:Pr crystals and films. • More faster decay kinetics of the Pr 3+ luminescence in LuAG:Pr films. • Low content of slow emission component in LuAG:Pr films.

Association of body mass index with ER, PR and 14-3-3σ expression in tumor and stroma of type I and type II endometrial carcinoma.

Science.gov (United States)

Peevey, Joseph F; Seagle, Brandon-Luke L; Maniar, Kruti P; Kim, J Julie

2017-06-27

Obesity is a prominent risk factor for endometrial cancer (EC) and can impede on surgical and hormonal treatments. Markers of EC, estrogen receptor (ER), progesterone receptor (PR), phospho(Ser473)-AKT (pAKT) and 14-3-3 sigma (14-3-3σ) were measured in EC tissues in both the tumor and stroma and grouped by body mass index (BMI). Immunohistochemical scoring of 82 cases of Type 1 and Type II EC tissues revealed a significantly increased tumor expression of ER, PR and 14-3-3σ in women with Type I (BMI PR and 14-3-3σ in the tumor epithelium was significantly higher in Type I than Type II. In particular, Type I EC exhibited significantly increased levels of only PR from patients with BMI > 40 compared to BMI PR, PIK3CA, PTEN and SFN (gene for 14-3-3σ) confirmed increased PR expression in EC of obese women. In conclusion, ER, PR and 14-3-3σ are differentially regulated in Type I compared to Type II EC while PR is dysregulated in obese women with Type I EC. These findings have potential implications for efficacy of progestin treatment in obese women.

Optical investigation of the valency of Pr in Y1-xPrxBa2Cu3O7-δ

International Nuclear Information System (INIS)

Kircher, J.; Cardona, M.; Gopalan, S.; Habermeier, H.; Fuchs, D.

1991-01-01

We have investigated the dependence of the visible-ultraviolet dielectric function of Y 1-x Pr x Ba 2 Cu 3 O 7 on the Pr content x using rotating analyzer ellipsometry. Based on recently published band-structure calculations, we believe that the valency of Pr can be deduced from the optical properties in this spectral region. Interband transitions should shift to higher energies for Pr 4+ and to lower energies for Pr 3+ when compared to the optical spectra of YBa 2 Cu 3 O 7 . In the case of tetravalent Pr ions, transitions into unoccupied Pr 5d levels should be observable. Since the experimental energies for interband transitions shift down with increasing x and no additional structure can be seen, we conclude that Pr is trivalent in Y 1-x Pr x Ba 2 Cu 3 O 7

Evolution of structural, magnetic and transport behavior by Pr doping in SrRuO3

Science.gov (United States)

Gupta, Renu; Pramanik, A. K.

2018-05-01

Here we report the evolution of structural, magnetic and transport behavior in perovskite based ruthenates Sr1-xPrxRuO3 (x=0.0 and 0.1). The substitution of Pr on Sr site retains orthorhombic structure while we find the slight change in structural parameters. The SrRuO3 has itinerant ferromagnet (FM) type nature of ordering temperature ˜160 K and below the transition temperature showing large bifurcation between ZFC and FC magnetization. By Pr doping, the magnetic moment decreases with decreasing bifurcation of ZFC and FC. The ZFC data show three distinct peaks (three transition temperature; TM1,TM2 and TM3). The magnetization study of both the samples, at high temperature fitted with modified CWL showing the decreasing value of ordering temperature by Pr doping matches close to TM2. The low-temperature isothermal magnetization M (H) data show that the high field saturation moment has decreased by Pr doping. The Arrott plot gives spontaneous magnetization (Ms) which is also decreased by Pr substitution. Evolution of Rhodes-Wohlfarth ratio value increases, which suggests that FM in this system evolves toward the more itinerant type by Pr doping. The electrical resistivity ρ(T) of both the samples show metallic behavior, in the all temperature range and ρ(T) increases by Pr doping while around below 45 K, the resistivity decreases by Pr doping and this crossing temperature also matches with ZFC data.

Spectral analysis of Pr{sup 3+} doped germanate glasses modified by BaO and BaF{sub 2}

Energy Technology Data Exchange (ETDEWEB)

Pisarska, Joanna, E-mail: joanna.pisarska@us.edu.pl [University of Silesia, Institute of Chemistry, Szkolna 9 Street, 40-007 Katowice (Poland); Pisarski, Wojciech A. [University of Silesia, Institute of Chemistry, Szkolna 9 Street, 40-007 Katowice (Poland); Dorosz, Dominik; Dorosz, Jan [Bialystok University of Technology, Faculty of Electrical Engineering, Wiejska 45D Street, 15-351 Bialystok (Poland)

2016-03-15

Luminescence properties of Pr{sup 3+} ions in germanate glasses modified by BaF{sub 2} were investigated. Several luminescence bands originating to transitions from the {sup 3}P{sub 0} state to the lower-lying states of Pr{sup 3+} were registered under 450 nm excitation. The spectral analysis suggests that the positions of luminescence bands and their relative intensities are changed significantly with BaF{sub 2} content. The relative integrated luminescence intensities of {sup 3}P{sub 0}→{sup 3}H{sub 4} transition (blue) to the {sup 3}P{sub 0}→{sup 3}F{sub 2} transition (red) of Pr{sup 3+} ions strongly depend on fluoride modifier BaF{sub 2} in glass composition. The luminescence bands of Pr{sup 3+} ions are shifted to shorter wavelengths with increasing BaF{sub 2} content. - Highlights: • Praseodymium doped lead-free germanate glasses modified by BaF{sub 2} were prepared. • Emission spectra correspond to transitions from {sup 3}P{sub 0} state to lower-lying states of Pr{sup 3+}. • The relative emission band intensities of Pr{sup 3+} depend strongly on BaF{sub 2} content. • Emission bands of Pr{sup 3+} are shifted to shorter wavelengths with increasing BaF{sub 2} content.

PR Interval Prolongation and Cryptogenic Stroke: A Multicenter Retrospective Study.

Science.gov (United States)

Montalvo, Mayra; Tadi, Prasanna; Merkler, Alexander; Gialdini, Gino; Martin-Schild, Sheryl; Navalkele, Digvijaya; Samai, Alyana; Nouh, Amre; Hussain, Mohammad; Goldblatt, Steven; Hemendinger, Morgan; Chu, Antony; Song, Christopher; Kamel, Hooman; Furie, Karen L; Yaghi, Shadi

2017-10-01

Atrial dysfunction or "cardiopathy" has been recently proposed as a mechanism in cryptogenic stroke. A prolonged PR interval may reflect impaired atrial conduction and thus may be a biomarker of atrial cardiopathy. We aim to compare the prevalence of PR interval prolongation in patients with cryptogenic stroke (CS) when compared with known non-cryptogenic non-cardioembolic stroke (NCNCS) subtypes. We used prospective ischemic stroke databases of 3 comprehensive stroke centers to identify patients 18 years or older with a discharge diagnosis of ischemic non-cardioembolic stroke between December 1, 2013 and August 31, 2015. The main outcome was ischemic stroke subtype (CS versus NCNCS). We compared PR intervals as a continuous and categorical variable (PR interval prolongation and CS. We identified 644 patients with ischemic non-cardioembolic stroke (224 CS and 420 NCNCS). Patients with CS were more likely to have a PR of 200 milliseconds or greater when compared with those with NCNCS (23.2% versus 13.8%, P = .009). After adjusting for factors that were significant in univariate analyses, a PR of 200 milliseconds or greater was independently associated with CS (odds ratio [OR] 1.70, 95% CI 1.08-2.70). The association was more pronounced when excluding patients on atrioventricular nodal blocking agents (OR 2.64, 95% CI 1.44-4.83). A PR of 200 milliseconds or greater is associated with CS and may be a biomarker of atrial cardiopathy in the absence of atrial fibrillation. Prospective studies are needed to confirm this association. Copyright © 2017 National Stroke Association. Published by Elsevier Inc. All rights reserved.

Leaching kinetic of Nd. Y, Pr and Sm in rare earth hydroxide (REOH) use nitric acid

Science.gov (United States)

Purwani, MV; Suyanti

2018-02-01

The purpose of this study were to determine the order of reaction, rate reaction constant and activation energy of reaction Y(OH)3, Nd(OH)3, Pr(OH)3 and Sm(OH)3 with HNO3. The rate reaction constant is necessary to determine the residence time in the design of continuously stirred tank reactor (CSTR). The studied parameters were leaching temperature (60 - 90 °C) and leaching time (0-15 minutes). From the resulting data can be concluded that the leaching process were strongly influenced by the time and temperature process. Leaching rare earth hydroxide (REOH) using nitric acid follows second order. At leaching 10 grams of REOH using 40 ml HNO3 0.0576 mol were obtained maximum conversion at 90 °C and leaching time 15 minutes for Y was 0.95 (leaching efficiency was 95%), for Nd was 0.97 ( leaching efficiency was 97%), for Pr was 0.94 (leaching efficiency was 94%) and for Sm was 0.94 (leaching efficiency was 94%). The largest activation energy was Y of 23.34 kJ/mol followed by Pr of 20.00 kJ/mol, Sm of 17.94 kJ/mol and the smallest was Nd of 16.39 kJ/mol. The relationship between the rate constant of the reaction with T for Y was kY = 338.26 e-23,34/RT, for Nd was kNd = 33.69 e -16,39 / RT, for Pr was kPr = 102.04 e-20 / RT and for Sm adalah was kSm = 50.16 e-17,94/RT

PrB{sub 7}{sup -}. A praseodymium-doped boron cluster with a Pr{sup II} center coordinated by a doubly aromatic planar η{sup 7}-B{sub 7}{sup 3-} ligand

Energy Technology Data Exchange (ETDEWEB)

Chen, Teng-Teng; Jian, Tian; Wang, Lai-Sheng [Department of Chemistry, Brown University, Providence, RI (United States); Li, Wan-Lu; Chen, Xin; Li, Jun [Department of Chemistry and Key Laboratory of Organic Optoelectronics and Molecular Engineering of Ministry of Education, Tsinghua University, Beijing (China)

2017-06-06

The structure and bonding of a Pr-doped boron cluster (PrB{sub 7}{sup -}) are investigated using photoelectron spectroscopy and quantum chemistry. The adiabatic electron detachment energy of PrB{sub 7}{sup -} is found to be low [1.47(8) eV]. A large energy gap is observed between the first and second detachment features, indicating a highly stable neutral PrB{sub 7}. Global minimum searches and comparison between experiment and theory show that PrB{sub 7}{sup -} has a half-sandwich structure with C{sub 6v} symmetry. Chemical bonding analyses show that PrB{sub 7}{sup -} can be viewed as a Pr{sup II}[η{sup 7}-B{sub 7}{sup 3-}] complex with three unpaired electrons, corresponding to a Pr (4f{sup 2}6s{sup 1}) open-shell configuration. Upon detachment of the 6s electron, the neutral PrB{sub 7} cluster is a highly stable Pr{sup III}[η{sup 7}-B{sub 7}{sup 3-}] complex with Pr in its favorite +3 oxidation state. The B{sub 7}{sup 3-} ligand is found to be highly stable and doubly aromatic with six delocalized π and six delocalized σ electrons and should exist for a series of lanthanide M{sup III}[η{sup 7}-B{sub 7}{sup 3-}] complexes. (copyright 2017 Wiley-VCH Verlag GmbH and Co. KGaA, Weinheim)

75 FR 54869 - Combined Notice of Filings 3

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2010-09-09

... DEPARTMENT OF ENERGY Federal Energy Regulatory Commission Combined Notice of Filings 3 September 02, 2010. Take notice that the Commission has received the following Natural Gas Pipeline Rate and...: Venice Gathering System, L.L.C. Description: Venice Gathering System, L.L.C. submits tariff filing per...

Magnetic properties of two new compounds: Pr2Ni3Si5 and Ho2Ni3Si5

International Nuclear Information System (INIS)

Mazumdar, C.; Padalia, B.D.; Godart, C.

1994-01-01

Formation of two more new materials, Pr 2 Ni 3 Si 5 and Ho 2 Ni 3 Si 5 , of the series, R 2 Ni 3 Si 5 (R = rare earth and Y) and their magnetic properties are reported here. These materials crystallize in the orthorhombic U 2 Co 3 Si 5 -type structure (space group Ibam). Magnetic susceptibility measurement in the temperature range 5 K--300 K show that the compound Pr 2 Ni 3 Si 5 order antiferromagnetically at T N ∼ 8.5 K and Ho 2 Ni 3 Si 5 at ∼ 6 K. Considering T N (Gd 2 Ni 3 Si 5 ) ∼ 15 K, T N (Pr 2 Ni 3 Si 5 ) ∼ 8.5 K is rather high. The magnetic susceptibility of both of the materials, in the paramagnetic state, follows a Curie-Weiss law with effective moment close to that of the corresponding free trivalent rare earth ion

Pr3 + -doped GeSx-based glasses for fiber amplifiers at 1.3 µm

Science.gov (United States)

Simons, D. R.; Faber, A. J.; de Waal, H.

1995-03-01

The photoluminescence properties of Pr3+ -doped GeS x -based glasses are studied and compared with those of other sulfide and fluoride glasses. The possibility of highly pump-power-efficient fiber amplifiers based on these GeSx-containing glasses in the telecommunications window at 1.3 mu m is discussed.

The Pr and Ca substitution in GdBa2Cu3O7-8

International Nuclear Information System (INIS)

Shakeri, H.; Akhavan, M.

2002-01-01

The granular Gd 1 -x-zPr x Ca z Ba 2 Cu 3 O 7 -8 (Gd Pr Ca-123) high-temperature cuprate samples with 0.0≤x≤0.3 and 0.0≤z≤0.35 are prepared by standard solid state reaction and characterized by XRD and SEM techniques. The BaCuO 2 and impurity phases are less than 1% in the samples having high levels of Pr and Ca concentrations. The electrical resistivity measurements show a nonlinear reduction in T c (x,z=etc) versus x. Moreover, the T c (z) curve with x=0 is nonlinear and a plateau appears at z≅0.05-0.015. For Pr-Ca-doped samples with a constant concentration of Pr, T c increases with the increase of Ca up to an optimum value of Ca doping and then in decreases. Based on these observations, we suggest that hole filling and hole localization the main effects of Pr ion substitution. The magnetic measurements indicate that the value of H C 1 is in the order of 10 m T. The magnetoresistance measurements have been measured and analyzed. The superconducting transition region is broadened by the application of magnetic field. The experimental data near the on sen of superconductivity are fitted with the Ambegakor and Halperin (A H) phase-slip model. We observe that the A H parameter, γ(H), depends not only on the temperature and the magnetic field, but also on the Pr and Ca ions concentrations. It is observed that the critical current density increases with Ca substitution and decreases with pr substitution in Gd-123 system. We suggest that the pr ion substitution probably enhances the weak link, but the Ca ion acts as flux pinning center in the Gd Pr Ca-123 system

Spectral-kinetic characteristics of Pr3+ luminescence in LiLuF4 host upon excitation in the UV-VUV range

International Nuclear Information System (INIS)

Stryganyuk, G.; Zimmerer, G.; Shiran, N.; Voronova, V.; Nesterkina, V.; Gektin, A.; Shimamura, K.; Villora, E.; Jing, F.; Shalapska, T.; Voloshinovskii, A.

2008-01-01

Spectral-kinetic study of Pr 3+ luminescence has been performed for LiLuF 4 :Pr(0.1 mol%) single crystal upon the excitation within 5-12 eV range at T=8 K. The fine-structure of Pr 3+ 4f 2 →4f 5d excitation spectra is shown for LiLuF 4 :Pr(0.1 mol%) to be affected by the efficient absorption transitions of Pr 3+ ions into 4f 5d involving 4f 1 core in the ground state. Favourable conditions have been revealed in LiLuF 4 :Pr(0.1 mol%) for the transformation of UV-VUV excitation quanta into the visible range. Lightly doped LiLuF 4 :Pr crystals are considered as the promising luminescent materials possessing the efficient Pr 3+3 P 0 visible emission upon UV-VUV excitation. The mechanism of energy transfer between Lu 3+ host ion and Pr 3+ impurity is discussed

Luminescence of (Ca,Sr)3(VO4)2: Pr3+, Eu3+ phosphor for use in CuPc-based solar cells and white light-emitting diodes

International Nuclear Information System (INIS)

Lin, Han-Yu; Chang, Wei-Fu; Chu, Sheng-Yuan

2013-01-01

The purpose of this study is to enhance the red emission intensity and expand the blue excitation band of a (Ca,Sr) 2.82 (VO 4 ) 2 :0.12Eu 3+ phosphor for use in copper phthalocyanine (CuPc)-based solar cells and white light-emitting diodes. It was found that substitution of 3% Sr 2+ replacing Ca 2+ enhanced red emission intensity of Ca 2.82 (VO 4 ) 2 :0.12Eu 3+ by 14% under 465-nm by excitation. The Pr 3+ co-doping effect was realized when blue excitation intensity of (Ca 0.97 Sr 0.03 ) 2.82 (VO 4 ) 2 :0.12Eu 3+ , located in the weakest absorption of CuPc, was improved by 126% with the addition of 0.6 mol% Pr 3+ . The absorption spectrum of CuPc/optimized (Ca 0.9668 Sr 0.03 ) 2.82 (VO 4 ) 2 :0.006Pr 3+ , 0.12Eu 3+ mixtures provided evidence that the (Ca 0.9668 Sr 0.03 ) 2.82 (VO 4 ) 2 :0.006Pr 3+ , 0.12Eu 3+ phosphor could increase the efficiency of incident photons on CuPc-based solar cells. Moreover, the good temperature stability of emission intensity and chromaticity of (Ca 0.9668 Sr 0.03 ) 2.82 (VO 4 ) 2 :0.006Pr 3+ , 0.12Eu 3+ indicated a potential for this phosphor to be applied on the white light-emitting diodes. - Highlights: ► Substitution of 3% Sr 2+ replacing Ca 2+ enhanced red emission intensity of Ca 2.82 (VO 4 ) 2 :0.12Eu 3+ by 14% under 465 nm by excitation. ► Addition of 0.6 mol% Pr 3+ enhanced blue excitation intensity of (Ca 0.97 Sr 0.03 ) 2.82 (VO 4 ) 2 :0.12Eu 3+ , located in the weakest absorption of CuPc, by 126%. ► According to absorption measurements of CuPc/optimized (Ca 0.9668 Sr 0.03 ) 2.82 (VO 4 ) 2 :0.006Pr 3+ , 0.12Eu 3+ mixtures for the first time, the feasibility of our phosphor to assist CuPc in converting blue-wavelength photons was proved. ► High temperature stability of emission intensity and chromaticity of (Ca 0.9668 Sr 0.03 ) 2.82 (VO 4 ) 2 :0.006Pr 3+ , 0.12Eu 3+ indicated our phosphor is acceptable for WLED applications.

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

Optical spectra and analysis of Pr3+ in β-NaYF4

International Nuclear Information System (INIS)

Martin, N.; Boutinaud, P.; Mahiou, R.; Cousseins, J.C.

1998-01-01

We report a spectroscopic investigation of β-NaYF 4 :Pr 3+ . In order to study the upconversion properties of this system we determined the Stark energy level of different multiplets from luminescence spectra using polycrystalline samples with several concentrations at temperatures between 15 and 300 K. We correlate the luminescence and structural description and confirm the presence of three sites for the rare-earth ions in this material. Selective excitation is used to assign the self energy levels for each Pr 3+ ion in the three sites. (orig.)

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2012-09-14

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[Pr2(pdc3(Hpdc(H2O4]n·n(H3hp·8n(H2O, a One-Dimensional Coordination Polymer Containing PrO6N3 Tri-Capped Trigonal Prisms and PrO8N Mono-Capped Square Anti-Prisms (H2pdc = Pyridine 2,6-Dicarboxylic Acid, C7H5NO4; 3hp = 3-Hydroxy Pyridine, C5H5NO

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Shahzad Sharif

2012-08-01

Full Text Available The synthesis, structure and some properties of the one-dimensional coordination polymer, [Pr2(pdc3(Hpdc]n·n(H3hp·8n(H2O, (H2pdc = pyridine 2,6-dicarboxylic acid, C7H5NO4; 3hp = 3-hydroxypyridine, C5H5NO are described. One of the Pr3+ ions is coordinated by two O,N,O-tridentate pdc2− ligands and one tridentate Hpdc− anion to generate a fairly regular PrO6N3 tri-capped trigonal prism, with the N atoms acting as the caps. The second Pr3+ ion is coordinated by one tridentate pdc2− dianion, four water molecules and two monodentate bridging pdc2− ligands to result in a PrO8N coordination polyhedron that approximates to a mono-capped square-anti-prism. The ligands bridge the metal-atom nodes into a chain, which extends in the [100] direction. The H3hp+ cation and uncoordinated water molecules occupy the inter-chain regions and an N–HLO and numerous O–HLO hydrogen bonds consolidate the structure. The H3hp+ species appears to intercalate between pendant pdc rings to consolidate the polymeric structure. Crystal data: 1 (C33H43N5O29Pr2, Mr = 1255.54, triclinic,  (No. 2, Z = 2, a = 13.2567(1 Å, b = 13.6304(2 Å, c = 13.6409(2 Å, α = 89.695(1°, β = 63.049(1°, γ = 86.105(1°, V = 2191.16(5 Å3, R(F = 0.033, wR(F2 = 0.084.

Pr3+-doped GeSx-based glasses for fiber amplifiers at 1.3 mm

NARCIS (Netherlands)

Simons, D.R.; Faber, A.J.; Waal, de H.

1995-01-01

The luminescence of Pr3+-doped GeSx-based glasses were studied and compared with those of other sulfide and fluoride glasses. The possibility of highly pump-power-efficient fiber amplifiers based on these GeSx-contg. glasses in the telecommunications window at 1.3 mm is discussed. [on SciFinder (R)

Enhancement in magnetic and dielectric properties of La and Pr co substituted BiFeO3

International Nuclear Information System (INIS)

Srivastava, Amit; Singh, H.K.; Awana, V.P.S.; Srivastava, O.N.

2013-01-01

Highlights: ► Significant enhancement in magnetization of BiFeO 3 is found on La and Pr co substitution. ► It is correlated with structural phase transformation and nanosized crystallites. ► Dielectric losses strongly diminish with La and Pr co substitution. -- Abstract: This report underlines the systematic studies of crystalline structure, magnetic and ferroelectric properties of polycrystalline Bi 1−x−y La x Pr y FeO 3 ceramic samples, in which x changes continuously from 0 to 0.2 for y = 0 and y from 0 to 0.2 for x = 0.2. X-ray diffraction (XRD) patterns revealed that La and Pr substitution at Bi site in the ceramic eliminates the usual impurity phases completely. Rietveld refinement of the XRD patterns shows that the crystal structure changes gradually from Rhombohedral (R3c) to Orthorhombic (pbnm) with increasing La and Pr concentration. This transition has significant effects on the multiferroic properties of Bi 1−x−y La x Pr y FeO 3 ceramics. Substantial enhancement in magnetization of Bi 1−x−y La x Pr y FeO 3 has been observed and this is found to be correlated with the evolution of structural phase change with doping of Pr in samples having lanthanum concentration of x = 0.2. This leads to the suppression of helical spin order. However, the enhancement in magnetic behavior also takes place due to nanocrystallite nature of Bi 1−x−y La x Pr y FeO 3 (x = 0.2, y = 0.05–0.2). For the nanocrystallites having sizes lower than 62 nm, which is the period of spin cycloid, this spin configuration will get destroyed resulting in the enhancement of magnetization. The studies of microstructures employing SEM and TEM revealed that Bi 1−x−y La x Pr y FeO 3 consists of nano size grained microstructures. It is also found that dielectric constant and dielectric loss get improved by La and Pr co-substitution. The dielectric constant for x = 0.0, y = 0.0 is 81 which changes to 354 for x = 0.2, y = 0.15 at 100 Hz. Dielectric losses are strongly

The Pr 2O 3/Si(0 0 1) interface studied by synchrotron radiation photo-electron spectroscopy

Science.gov (United States)

Schmeißer, D.; Müssig, H.-J.

2003-10-01

Pr 2O 3 is currently under consideration as a potential replacement for SiO 2 as the gate-dielectric material for sub-0.1 μm complementary metal-oxide-semiconductor (CMOS) technology. We studied the Pr 2O 3/Si(0 0 1) interface by a non-destructive depth profiling using synchrotron radiation photoelectron spectroscopy. Our data suggests that there is no silicide formation at the interface. Based on reported results, a chemical reactive interface exists, consisting of a mixed Si-Pr oxide such as (Pr 2O 3) x(SiO 2) 1- x, i.e. as a silicate phase with variable silicon content. This pseudo-binary alloy at the interface offers large flexibility toward successful integration of Pr 2O 3 into future CMOS technologies.

On the dimorphism of Pr{sub 6}Mo{sub 10}O{sub 39}

Energy Technology Data Exchange (ETDEWEB)

Rudolph, Daniel; Laufer, Sonja; Hartenbach, Ingo [Stuttgart Univ. (Germany). Inst. for Inorganic Chemistry

2017-07-01

Attempts to synthesize Pr{sub 4}Mo{sub 7}O{sub 27} using Pr, Pr{sub 6}O{sub 11} and MoO{sub 3} in a molar ratio of 8:6:77 led to a main product of scheelite-type Pr{sub 0.667}[MoO{sub 4}] and few single crystals of the triclinic A-type Pr{sub 6}Mo{sub 10}O{sub 39}. The latter crystallizes in space group P anti 1 (a=945.25(1), b=1058.49(2), c=1815.16(3) pm; α=104.149(1), β=95.220(1), γ=102.617(1) , Z=2). Its crystal structure comprises six crystallographically independent Pr{sup 3+} cations, eight tetrahedral [MoO{sub 4}]{sup 2-} units, and one [Mo{sub 2}O{sub 7}]{sup 2-} entity. The cations display coordination numbers of seven (1 x) and eight (5 x), while the [MoO{sub 4}]{sup 2-} tetrahedra are surrounded by five Pr{sup 3+} cations each. The [Mo{sub 2}O{sub 7}]{sup 2-} anions exhibit a coordination environment of seven Pr{sup 3+} cations. The attempt to synthesize PrF[MoO{sub 4}] using PrOF (from in situ thermal decomposition of PrF[CO{sub 3}]) as reagent did not lead to the desired product but to monoclinic B-type Pr{sub 6}Mo{sub 10}O{sub 39}. This slightly less dense modification compared to its triclinic analogue crystallizes in space group C2/c (a=1247.93(3), b=1989.68(6), c=1392.52 (4) pm, β=100.505(2) , Z=4) with three crystallographically independent Pr{sup 3+} cations, four [MoO{sub 4}]{sup 2-} tetrahedra, and again one [Mo{sub 2}O{sub 7}]{sup 2-} unit in the crystal structure. Thus, both Pr{sub 6}Mo{sub 10}O{sub 39} modifications are better described with the structured formula Pr{sub 6}[MoO{sub 4}]{sub 8}[Mo{sub 2}O{sub 7}]. The coordination numbers around the Pr{sup 3+} cations are seven (1 x) and eight (2 x) while all four [MoO{sub 4}]{sup 2-} anions are again surrounded by five Pr{sup 3+} cations each. Six of the latter represent the coordination environment around the [Mo{sub 2}O{sub 7}]{sup 2-} entities. Besides the thorough comparison of the crystal structures single crystal Raman spectra were recorded for both Pr{sub 6}Mo{sub 10}O{sub 39

Synthesis and characterization of praseodymium-142 hydroxyapatite (142Pr-HA)

International Nuclear Information System (INIS)

Duyeh Setiawan; Daud Nurhasan

2015-01-01

The use of radioisotope of lanthanide group with range of beta energy 0.4 - 2.2 MeV has been renewed interest in nuclear medicine. Praseodymium-142 radioisotope ( 142 Pr, t 1/2 = 19.2 hours, E β = 2.16 MeV) is suitable for applications radiotherapy. Labelled of the hydroxyapatite (Ca 10 (PO 4 )6(OH) 2 ) can be used as carrier of radionuclide after injection in the body injection. This research aim as a preliminary studies to make praseodymium-142 hydroxyapatite ( 142 Pr-HA) as a radiotherapy agent. The optimum condition of praseodymium-142 hydroxyapatite synthesis by controlling several parameters such as the pH and the weight of hydroxyapatite was obtained from process by used the nonradioactive praseodymium. The optimum condition of hydroxyapatite by praseodymium are at pH 5 and weight ratio praseodymium : hydroxyapatite is 1 : 16. The percentage of labeling hydroxyapatite with 142 PrCl 3 was 99.50% and the radiochemical purity of 142 Pr-Ha was 95.20%. (author)

Synthesis and photoluminescence properties of Eu{sup 3+}, Sm{sup 3+} and Pr{sup 3+} doped Ca{sub 2}ZnWO{sub 6} phosphors for phosphor converted LED

Energy Technology Data Exchange (ETDEWEB)

Dabre, K.V. [Department of Physics, Arts, Commerce and Science College, Koradi, Nagpur-441111, Maharashtra (India); Dhoble, S.J., E-mail: sjdhoble@rediffmail.com [Department of Physics, R.T.M. Nagpur University, Nagpur-440033, Maharashtra (India)

2014-06-01

In this work, we report on the synthesis and photoluminescence (PL) properties of rare earth (Eu{sup 3+}, Sm{sup 3+} and Pr{sup 3+}) doped double perovskite tungstate Ca{sub 2}ZnWO{sub 6} phosphor. The phosphors were synthesized by two step modified solid state method. Phase purity and formation of phosphor were confirmed by XRD technique. PL spectra of Eu{sup 3+}, Sm{sup 3+} and Pr{sup 3+} doped phosphor show intense emission peaks in red region at 615, 604 and 650 nm respectively, upon the visible excitation of 466 nm (Eu{sup 3+}), 410 nm (Sm{sup 3+}) and 491 nm (Pr{sup 3+}). The CIE coordinates of the phosphors are in the yellow (Sm{sup 3+} doped sample) and orange (Eu{sup 3+} and Pr{sup 3+} doped sample) regions near the edge of color space which confirms their applicability in LEDs. -- Highlights: •Eu{sup 3+}, Sm{sup 3+} and Pr{sup 3+} doped and undoped samples of Ca{sub 2}ZnWO{sub 6} phosphor synthesized by Solid state method. •The phosphors have intense excitation in violet and blue region of visible spectrum. •Phosphors show intense emission peaks in red region. •CIE coordinates of phosphors are lie in yellow (Sm{sup 3+} doped phosphor) and orange (Eu{sup 3+} and Pr{sup 3+} doped phosphor) region near to edge of color space.

Variable expressivity of FGF3 mutations associated with deafness and LAMM syndrome

Directory of Open Access Journals (Sweden)

Griffith Andrew J

2011-02-01

Full Text Available Abstract Background Recessive mutations of fibroblast growth factor 3 (FGF3 can cause LAMM syndrome (OMIM 610706, characterized by fully penetrant complete labyrinthine aplasia, microtia and microdontia. Methods We performed a prospective molecular genetic and clinical study of families segregating hearing loss linked to FGF3 mutations. Ten affected individuals from three large Pakistani families segregating FGF3 mutations were imaged with CT, MRI, or both to detect inner ear abnormalities. We also modeled the three dimensional structure of FGF3 to better understand the structural consequences of the three missense mutations. Results Two families segregated reported mutations (p.R104X and p.R95W and one family segregated a novel mutation (p.R132GfsX26 of FGF3. All individuals homozygous for p.R104X or p.R132GfsX26 had fully penetrant features of LAMM syndrome. However, recessive p.R95W mutations were associated with nearly normal looking auricles and variable inner ear structural phenotypes, similar to that reported for a Somali family also segregating p.R95W. This suggests that the mild phenotype is not entirely due to genetic background. Molecular modeling result suggests a less drastic effect of p.R95W on FGF3 function compared with known missense mutations detected in fully penetrant LAMM syndrome. Since we detected significant intrafamilial variability of the inner ear structural phenotype in the family segregating p.R95W, we also sequenced FGF10 as a likely candidate for a modifier. However, we did not find any sequence variation, pointing out that a larger sample size will be needed to map and identify a modifier. We also observed a mild to moderate bilateral conductive hearing loss in three carriers of p.R95W, suggesting either a semi-dominant effect of this mutant allele of FGF3, otitis media, or a consequence of genetic background in these three family members. Conclusions We noted a less prominent dental and external ear phenotype in

Characterization and optical properties of Pr2O3-doped ...

Indian Academy of Sciences (India)

2017-06-09

Jun 9, 2017 ... Pr3+ doped molybdenum lead-borate glasses with the chemical ... Thermal, optical and structural analyses are carried out using DSC, UV and FTIR spectra. ... energy band gap (Egopt), of these glasses have been determined.

Incommensurate magnetism in non-superconducting PrBa2Cu3O6.92

DEFF Research Database (Denmark)

Boothroyd, A.T.; Hill, J.P.; McMorrow, D.F.

1999-01-01

We report the discovery of incommensurate magnetic order in non-superconducting single crystals PrBa2Cu3O6.92. Resonant X-ray magnetic scattering at the Pr L-II and L-III edges and high resolution neutron diffraction were used to characterise the magnetic order on the different magnetic sublattices...

Improved ferroelectric and photoluminescence properties in Pr3+ substituted Na0.5Bi0.5TiO3 synthesized using hydrothermal route

Science.gov (United States)

Goutham, Cilaveni; Kandula, Kumara Raja; Raavi, Sai Santhosh Kumar; Asthana, Saket

2018-04-01

Nanocrystalline Pr3+ substituted NBT was synthesized using hydrothermal technique. Pr3+ modifies the ferroelectric NBT optically active and enhances the electrical properties with small structural changes. Aiming to the development of the bottom up optoelectronic devices this optimized nanoscale Na0.5Bi0.5-xPrxTiO3(x = 0.005) compound is synthesized hydrothermally. X-ray diffraction pattern shows that the system is stabilized in the Rhombohedral (space groupR3c) phase indicating the local strain inhomogeneity. PE loop shows that there is a decrement in the Ec value compared with compounds synthesized using conventional methods. The strong red emission assigned to prominent transition of the Pr3+ ions at 610nm was observed along with weak blue-green emission, indicating the potential use of the system. Energy transfer from host system to Pr3+ ions is responsible for red emission while blue green emission is due to quenching of 3P0 induced by intervalence charge transfer state.

Spin-Orbit Interaction and Kondo Scattering at the PrAlO3/SrTiO3 Interface

Science.gov (United States)

Mozaffari, Shirin; Guchhait, Samaresh; Markert, John

We have investigated the effect of oxygen content, in the PO2 range of 6 ×10-6 - 1 ×10-3 torr, on the spin-orbit (SO) interaction at PrAlO3/SrTiO3 interface. The most-conducting 2-D-like PrAlO3 interfaces were not as conducting as comparable LaAlO3 samples, indicating either a steric or mixed-valent effect. The least-conducting, most oxygenated PrAlO3 interface exhibits hole conductivity, a departure from the typical electron-doped behavior. For 10-5 and 10-4 torr samples, high-temperature metallic behavior is accompanied by an upturn in resistivity at low temperatures, consistent with Kondo scattering theory; analysis gives a Kondo temperature 17 K. The magnetoresistance (MR) for the low PO2-grown samples was modeled with a positive part due to weak anti-localization (WAL) from a strong SO interaction, and a negative part due to the Kondo effect. The variation of MR suggests a strong SO interaction for the 10-5 torr sample with HSO = 1.25 T in both field orientations. The WAL effect is smaller for higher PO2-grown samples, where the high-field MR is dominated by the Kondo effect.

Luminescent and scintillation properties of the Pr"3"+ doped single crystalline films of Lu_3Al_5_−_xGa_xO_1_2 garnet

International Nuclear Information System (INIS)

Gorbenko, V.; Zorenko, Yu; Zorenko, T.; Voznyak, T.; Paprocki, K.; Fabisiak, K.; Fedorov, A.; Bilski, P.; Twardak, A.; Zhusupkalieva, G.

2016-01-01

The Pr"3"+ d–f luminescence was investigated in the single crystalline films (SCF) of Lu_3Al_5_−_xGa_xO_1_2:Pr garnet solid solution at x = 1–3, grown by the liquid phase epitaxy (LPE) method from the melt-solution based on the PbO–B_2O_3 flux. The shape of CL spectra and decay kinetics of Pr"3"+ ions in Lu_3Al_5_−_xGa_xO_1_2 SCFs strongly depend on the total gallium concentration x and distribution of Ga"3"+ ions between the tetrahedral and octahedral position of the garnet host. The best scintillation properties of Lu_3Al_5_−_xGa_xO_1_2:Pr SCF are achieved at the nominal Ga content in melt-solution in the x = 2–2.5 range. - Highlights: • Single crystalline films of Lu_3Al_5_−_x Ga_xO_1_2:Pr garnet at x = 1–3 were grown by the LPE method. • Pr"3"+ emission spectra, light yield and decay time of films show strong dependence on Ga content. • The maximal light yield of Lu_3Al_5_−_x Ga_xO_1_2:Pr film is observed at Ga content x = 2.0–2.5.

40 CFR 95.3 - Findings prior to application to Attorney General.

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2010-07-01

... Attorney General. 95.3 Section 95.3 Protection of Environment ENVIRONMENTAL PROTECTION AGENCY (CONTINUED... General. The Administrator, or the Administrator's designee, may apply to the Attorney General for a... application to the Attorney General; (c) The patent under which a patent license is sought in the application...

Magnetic and XMCD studies of Pr1−xSrxMnO3 manganite films

International Nuclear Information System (INIS)

Samoshkina, Yu.E.; Edelman, I.S.; Stepanova, E.A.; Neznakhin, D.S.; Ollefs, K.; Andreev, N.V.; Chichkov, V.I.

2017-01-01

Magnetic properties of the Pr 0.8 Sr 0.2 MnO 3 and Pr 0.6 Sr 0.4 MnO 3 polycrystalline films have been studied using temperature and magnetic field dependences of the static magnetization and X-ray magnetic circular dichroism (XMCD) spectroscopy. For the both compositions, the difference between the temperature dependences of magnetization obtained in the zero fields cooling (ZFC) and field cooling (FC) modes has been revealed. The ZFC curves demonstrate a pronounced maximum at temperature T m . It is shown that the T m value dependence on the magnetic field follows the Almeida-Thouless line typical for the classic spin glass, what allows us to assume the possible spin-glass behavior of the films. Effect of the disorder in a direction of the crystallites easy-axis on the difference between FC and ZFC curves has been discussed also. Magnetic field dependences of the sample magnetization are presented by the hysteresis loops with the shape changing upon temperature variation. This behavior has been attributed to the effect of crystallographic anisotropy and Pr ions. The spectra and magnetic field dependences of XMCD at the Pr L 2 - and Mn K-edges have been studied at 90 K. The magnetic field dependences of the XMCD at the Pr L 2 -edge had shown Van Vleck paramagnetism from Pr 3+ ions. - Highlights: • M (T) magnetization behavior indicates the presence of spin glass behavior in the films. • Shape of the hysteresis loops depends on temperature. • Magnetic field dependences of XMCD at T=90 K reveal Van Vleck paramagnetism from Pr 3+ ions.

Synthesis and luminescence characterization of Pr3+ doped Sr1.5Ca0.5SiO4 phosphor

Science.gov (United States)

Vidyadharan, Viji; Mani, Kamal P.; Sajna, M. S.; Joseph, Cyriac; Unnikrishnan, N. V.; Biju, P. R.

2014-12-01

Luminescence properties of Pr3+ activated Sr1.5Ca0.5SiO4 phosphors synthesized by solid state reaction method are reported in this work. Blue, orange red and red emissions were observed in the Pr3+ doped sample under 444 nm excitation and these emissions are assigned as 3P0 → 3H4, 3P0 → 3H6 and 3P0 → 3F4 transitions. The emission intensity shows a maximum corresponding to the 0.5 wt% Pr3+ ion. The decay analysis was done for 0.05 and 0.5 wt% Pr3+ doped samples for the transition 3P0 → 3H6. The life times of 0.05 and 0.5 wt% Pr3+ doped samples were calculated by fitting to exponential and non-exponential curve respectively, and are found to be 156 and 105 μs respectively. The non-exponential behaviour arises due to the statistical distribution of the distances between the ground state Pr3+ ions and excited state Pr3+ ions, which cause the inhomogeneous energy transfer rate. The XRD spectrum confirmed the triclinic phase of the prepared phosphors. The compositions of the samples were determined by the energy dispersive X-ray spectra. From the SEM images it is observed that the particles are agglomerated and are irregularly shaped. IR absorption bands were assigned to different vibrational modes. The well resolved peaks shown in the absorption spectra are identical to the excitation spectra of the phosphor samples. Pr3+ activated Sr1.5Ca0.5SiO4 phosphors can be efficiently excited with 444 nm irradiation and emit multicolour visible emissions. From the CIE diagram it can be seen that the prepared phosphor samples give yellowish-green emission.

75 FR 10026 - Proposed Collection; Comment Request for Forms W-2, W-2c, W-2AS, W-2GU, W-2VI, W-3, W-3c, W-3cPR...

Science.gov (United States)

2010-03-04

... W-2, W-2c, W-2AS, W-2GU, W-2VI, W-3, W-3c, W-3cPR, W-3PR, and W-3SS AGENCY: Internal Revenue Service....C. 3506(c)(2)(A)). Currently, the IRS is soliciting comments concerning Forms W-2, W-2c, W-2AS, W-2GU, W-2VI, W-3, W-3c, W- 3cPR, W-3PR, and W-3SS. DATES: Written comments should be received on or...

Energy transfer in Pr3+ and Mn2+ co-doped SrB6O10 and SrB4O7

International Nuclear Information System (INIS)

Chen Yonghu; Yan Wuzhao; Shi Chaoshu

2007-01-01

The luminescent properties of Pr 3+ and Mn 2+ -doped SrB 6 O 10 and SrB 4 O 7 powder samples were investigated from the point of view of energy transfer between Pr 3+ and Mn 2+ . The emission from the 1 S 0 level of Pr 3+ was found in the SrB 6 O 10 :Pr 3+ sample as well as in the SrB 4 O 7 :Pr 3+ sample, indicating the 1 S 0 level is below the lowest 4f5d energy level in these hosts. The spectral overlaps between the emission spectra of Pr 3+ -doped samples and the excitation spectra of Mn 2+ -doped sample were found in both kinds of strontium borates. These spectral overlaps are in favor of the energy transfer from Pr 3+ to Mn 2+ . However, in the emission spectra of the SrB 6 O 10 :Pr 3+ , Mn 2+ , no indication of energy transfer was observed, though the emission spectra of SrB 4 O 7 :Pr 3+ , Mn 2+ did show evidence of energy transfer from Pr 3+ to Mn 2+ . The possible reasons were discussed

Interaction of La3+, Ce3+, Pr3+ and Sm3+ with DL-aspartic acid in dimethyl sulphoxide

International Nuclear Information System (INIS)

Saxena, M.C.; Saxena, R.S.

1980-01-01

La(III), Ce(III), Pr(III) and Sm(III) form 1:1 and 1:2 complexes with DL-aspartic acid in 20% aq. dimethyl sulphoxide at μ = 0.1M (NaClO 4 ) as revealed by pH-metric and conductometric titrations. Stabilities of the complexes follow the order: La 3+ 3+ 3+ 3+ . The overall changes in ΔG, ΔH and ΔS for the metal-ligand interaction have also been reported at 30deg C. (auth.)

Magnetic relaxation behaviour in Pr_2NiSi_3

International Nuclear Information System (INIS)

Pakhira, Santanu; Mazumdar, Chandan; Ranganathan, R.

2016-01-01

Time dependent isothemal remanent magnetizatin (IRM) behaviour for polycrystalline compound Pr_2NiSi_3 have been studied below its characteristic temperature. The compound undergoes slow magnetic relaxation with time. Along with competing interaction, non-magnetic atom disorder plays an important role in formation of non-equilibrium glassy like ground state for this compound.

Comparative investigation on the spectroscopic properties of Pr3+-doped boro-phosphate, boro-germo-silicate and tellurite glasses

Science.gov (United States)

Zhang, Liaolin; Dong, Guoping; Peng, Mingying; Qiu, Jianrong

We report on the spectroscopic properties of Pr3+-doped boro-phosphate, boro-germo-silicate and tellurite glasses. The stimulated absorption and emission cross sections were estimated. Only one emission at 596 nm and 605 nm is observed in Pr3+-doped boro-phosphate and boro-germo-silicate glasses, respectively, while three emissions at 605 nm, 612 nm and 645 nm are observed in Pr3+-doped tellurite glass when excited at 467 nm. The fluorescence lifetime at 600 nm in Pr3+-doped boro-phosphate, boro-germo-silicate and tellurite glasses is 137 μs, 73 μs and 51 μs, respectively. The emissions from Pr3+-doped boro-phosphate, boro-germo-silicate and tellurite glasses show different decay behaviors and can be well explained by multiphonon relaxation theory.

Thermoelectric performance enhancement of SrTiO3 by Pr doping

KAUST Repository

Kahaly, M. Upadhyay; Schwingenschlö gl, Udo

2014-01-01

We investigate Pr doping at the Sr site as a possible route to enhance the thermoelectric behavior of SrTiO3-based materials, using first principles calculations in full-potential density functional theory. The effects of the Pr dopant on the local electronic structure and resulting transport properties are compared to common Nb doping. We demonstrate a substantial enhancement of the thermoelectric figure of merit and develop an explanation for the positive effects, which opens new ways for materials optimization by substitutional doping at the perovskite B site. © 2014 the Partner Organisations.

Energy transfer from Pr3+ to Gd3+ ions in BaB8O13 phosphor for phototherapy lamps

Science.gov (United States)

Tamboli, Sumedha; Nair, Govind B.; Dhoble, S. J.; Burghate, D. K.

2018-04-01

A series of BaB8O13 phosphors doped with different concentrations of Gd3+ ions and co-doped with Pr3+ ions were synthesized by solid state synthesis method. X-ray powder diffraction (XRD) analysis confirmed the formation of the compound in a crystalline and homogeneous form. Scanning Electron Microscopy (SEM) was performed to study the surface morphology of the compound and Fourier Transform Infrared (FT-IR) spectroscopy measurements determined the nature of bonding between elements of the compounds. The photoluminescence (PL) excitation spectra of BaB8O13:Gd3+ phosphor showed excitation peaks at 246 nm, 252 nm and 274 nm. The prominent emission peak was observed at 313 nm which is in narrow band ultraviolet B (NB-UVB) range. Energy transfer was achieved by co-doping Pr3+ ions with Gd3+ ions. PL decay time was also measured for BaB8O13: Gd3+, Pr3+ phosphor. Emission at 313 nm can be used for the treatment of skin diseases.

Significant enhancement in thermoelectric properties of polycrystalline Pr-doped SrTiO3−δ ceramics originating from nonuniform distribution of Pr dopants

KAUST Repository

Dehkordi, Arash Mehdizadeh

2014-05-12

Recently, we have reported a significant enhancement ( >70% at 500 °C) in the thermoelectric power factor (PF) of bulk polycrystalline Pr-doped SrTiO3 ceramics employing a novel synthesis strategy which led to the highest ever reported values of PF among doped polycrystalline SrTiO3. It was found that the formation of Pr-rich grain boundary regions gives rise to an enhancement in carrier mobility. In this Letter, we investigate the electronic and thermal transport in Sr1− x Pr x TiO3 ceramics in order to determine the optimum doping concentration and to evaluate the overall thermoelectric performance. Simultaneous enhancement in the thermoelectric power factor and reduction in thermal conductivity in these samples resulted in more than 30% improvement in the dimensionless thermoelectric figure of merit (ZT) for the whole temperature range over all previously reported maximum values. Maximum ZT value of 0.35 was obtained at 500 °C.

Significant enhancement in thermoelectric properties of polycrystalline Pr-doped SrTiO3−δ ceramics originating from nonuniform distribution of Pr dopants

KAUST Repository

Dehkordi, Arash Mehdizadeh; Bhattacharya, Sriparna; He, Jian; Alshareef, Husam N.; Tritt, Terry M.

2014-01-01

Recently, we have reported a significant enhancement ( >70% at 500 °C) in the thermoelectric power factor (PF) of bulk polycrystalline Pr-doped SrTiO3 ceramics employing a novel synthesis strategy which led to the highest ever reported values of PF among doped polycrystalline SrTiO3. It was found that the formation of Pr-rich grain boundary regions gives rise to an enhancement in carrier mobility. In this Letter, we investigate the electronic and thermal transport in Sr1− x Pr x TiO3 ceramics in order to determine the optimum doping concentration and to evaluate the overall thermoelectric performance. Simultaneous enhancement in the thermoelectric power factor and reduction in thermal conductivity in these samples resulted in more than 30% improvement in the dimensionless thermoelectric figure of merit (ZT) for the whole temperature range over all previously reported maximum values. Maximum ZT value of 0.35 was obtained at 500 °C.

AC Electroluminescent Processes in Pr3+-Activated (Ba0.4Ca0.6TiO3 Diphase Polycrystals

Directory of Open Access Journals (Sweden)

Nan Gao

2017-05-01

Full Text Available We investigated the properties of alternating current (AC-driven electroluminescence from (Ba0.4Ca0.6TiO3:Pr3+ diphase polycrystal-based device. The results of crystal phases and micrographs, and the symmetrical dual emissions in one AC cycle, indicate the spontaneous formation of a dielectric/phosphor/dielectric sandwich microstructure in (Ba0.4Ca0.6TiO3:Pr3+. The electroluminescent device emits a red light of 617 nm, which is attributed to the 1D2-3H4 transition of Pr3+ in the phosphor phase. At a fixed AC frequency, the intensity of electroluminescence exhibits a steep enhancement when applying an increased driving electric field that is beyond a threshold. In a fixed driving electric field, the intensity of electroluminescence shows a rapid rise at low frequencies, but reaches saturation at high frequencies. Based on a double-injection model, we discussed systematically the electroluminescent processes in a whole cycle of AC electric field, which matched well with the experimental data. Our investigation is expected to expand our understanding of such a diphase electroluminescent device, thereby promoting their applications in lighting and displays.

Magnetorresistência colossal em La5/8-yPr yCa3/8MnO3 Magnetoresistance in La5/8-yPr yCa3/8MnO3

Directory of Open Access Journals (Sweden)

S. H. Masunaga

2007-09-01

Full Text Available Amostras policristalinas de La5/8-yPr yCa3/8MnO3, 0 0,35 também mostram uma transição para o estado de ordenamento de carga/orbital T OC. Uma análise das medidas de ro(T, H sugere a coexistência de pelo menos duas fases distintas nesses materiais: uma ferromagnética-metálica FMM e uma segunda, com ordenamento de carga/orbital e comportamento isolante OCI. Os resultados também permitem concluir que as frações volumétricas dessas fases podem ser manipuladas, alterando-se parâmetros termodinâmicos como T e H. A magnetorresistência MR(T, determinada através das medidas de ro(T, H, foi observada ocorrer em uma larga faixa de temperatura e em todas as amostras pertencentes à série. Amostras ricas em Pr (y > 0,35 revelam um efeito de magnetorresistência colossal amplificado devido à coexistência e competição das FMM e OCI cujas frações volumétricas podem ser alteradas via mudança da temperatura e aplicação de um campo magnético externo.Polycrystalline samples of La5/8-yPr yCa3/8MnO3; 0 0.35 a transition to a charge and orbital-ordered state was also observed. The rho(T, H data analyses suggest the coexistence of at least two ordered phases in these samples: a ferromagnetic metallic phase FMM and a charge and orbital-ordered insulating COI phase.The data also indicate that the volume fraction of these phases can be changed by the variation of thermodynamic parameters like temperature T and magnetic field H. The magnetoresistance MR(T determined from rho(T, H data were observed in a large temperature range for all samples. In addition, samples with y > 0.35 were found to display a pronounced colossal magnetoresistance effect due to a severe competition between FMM and COI coexisting phases.

75 FR 30014 - Consumers Energy Company; Notice of Baseline Filing

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2010-05-28

... DEPARTMENT OF ENERGY Federal Energy Regulatory Commission [Docket No. PR10-25-000] Consumers Energy Company; Notice of Baseline Filing May 21, 2010. Take notice that on May 17, 2010, Consumers Energy Company (Consumers) submitted a baseline filing of its Statement of Operating Conditions for the...

μ+ relaxation correlated with susceptibility in the van-Vleck paramagnet PrIn3

International Nuclear Information System (INIS)

Grayevsky, A.; Amato, A.; Pinkpank, M.; Schenck, A.

1997-01-01

A previously unobserved increase of the magnetic susceptibility in PrIn 3 at low temperatures is reported. The increase is shown to correlate nicely with a large increase in the transverse μSR depolarization rate. Evidence supports the conclusion that both phenomena are related to some degree of atomic disorder in the structure, and an associated strong Pr CEF level changes. (orig.)

78 FR 28837 - Acadian Gas Pipeline System; Notice of Petition

Science.gov (United States)

2013-05-16

... DEPARTMENT OF ENERGY Federal Energy Regulatory Commission [Docket No. PR11-129-001] Acadian Gas Pipeline System; Notice of Petition Take notice that on May 6, 2013, Acadian Gas Pipeline System (Acadian... concerns filed in the September 26, 2011 filing, as more fully detailed in the petition. Any person...

The Pr and Ca Substitution in GdBa2Cu3O7- & delta

Directory of Open Access Journals (Sweden)

H. S. H.

2001-12-01

Full Text Available   The granular Gd1-x-zPrxCazBa2Cu3O7-δ high-temperature cuprate samples with 0.0 ≤ x ≤ 0.3 and 0.0≤ x ≤ 0.35 are prepared by standard solid state reaction and characterized by XRD and SEM techniques. The BaCuO2 and impurity phases are less than 1% in the samples having high levels of pr and Ca concentrations. The electrical resistivity measurements show a nonlinear reduction in Tc(x,z=etc versus x. Moreover, the Tc(z curve with x=0 is nonlinear and aplateau appears at z≈ 0.05-0.015. For Pr-Ca-doped samples with a constant concentration of Pr, Tc increases with the increase of Ca up to an optimum value of Ca doping and then in decreases. Based on these observations, we suggest that hole filling and hole localization the main effects of Pr ion substiution. The magnetic measurements indicate that the value of Hc1 is in the order of 10 mT. The mangetoresistance measurements have been measured and analyzed. The superconducting transition region is broadened by the application of magnetic field. The experimental data near the onsen of superconductivity are fitted with the Ambegakor and Halperin (AH phase-slip model. We observe that the AH parameter,γ (H, depends not only on the temperature and the magnetic field, but also on the Pr and Ca ions concentrations. It is observed that the critical current density increases with Ca substitution and decreases with Pr substitution in Gd-123 system. We suggest that the Pr ion substitution probably enhances the weak link, but the Ca ion acts as flux pinning center in the GdPrCa-123 system.

76 FR 73618 - Enterprise Texas Pipeline LLC; Notice of Compliance Filing

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2011-11-29

... DEPARTMENT OF ENERGY Federal Energy Regulatory Commission [Docket Nos. PR11-92-001] Enterprise Texas Pipeline LLC; Notice of Compliance Filing Take notice that on November 22, 2011, Enterprise Texas Pipeline LLC (Enterprise Texas) filed a revised Statement of Operating Conditions to comply with a...

77 FR 28373 - Liberty Energy (Midstates) Corp.; Notice of Baseline Filing

Science.gov (United States)

2012-05-14

... DEPARTMENT OF ENERGY Federal Energy Regulatory Commission [Docket No. PR12-24-000] Liberty Energy (Midstates) Corp.; Notice of Baseline Filing Take notice that on April 30, 2012, Liberty Energy (Midstates) Corp. submitted a baseline filing of their Statement of Operating Conditions for services provided...

PR interval prolongation in coronary patients or risk equivalent: excess risk of ischemic stroke and vascular pathophysiological insights.

Science.gov (United States)

Chan, Yap-Hang; Hai, Jo Jo; Lau, Kui-Kai; Li, Sheung-Wai; Lau, Chu-Pak; Siu, Chung-Wah; Yiu, Kai-Hang; Tse, Hung-Fat

2017-08-24

Whether PR prolongation independently predicts new-onset ischemic events of myocardial infarction and stroke was unclear. Underlying pathophysiological mechanisms of PR prolongation leading to adverse cardiovascular events were poorly understood. We investigated the role of PR prolongation in pathophysiologically-related adverse cardiovascular events and underlying mechanisms. We prospectively investigated 597 high-risk cardiovascular outpatients (mean age 66 ± 11 yrs.; male 67%; coronary disease 55%, stroke 22%, diabetes 52%) for new-onset ischemic stroke, myocardial infarction (MI), congestive heart failure (CHF), and cardiovascular death. Vascular phenotype was determined by carotid intima-media thickness (IMT). PR prolongation >200 ms was present in 79 patients (13%) at baseline. PR prolongation >200 ms was associated with significantly higher mean carotid IMT (1.05 ± 0.37 mm vs 0.94 ± 0.28 mm, P = 0.010). After mean study period of 63 ± 11 months, increased PR interval significantly predicted new-onset ischemic stroke (P = 0.006), CHF (P = 0.040), cardiovascular death (P 200 ms. Using multivariable Cox regression, PR prolongation >200 ms independently predicted new-onset ischemic stroke (HR 8.6, 95% CI: 1.9-37.8, P = 0.005), cardiovascular death (HR 14.1, 95% CI: 3.8-51.4, P PR interval predicts new-onset MI at the exploratory cut-off >162 ms (C-statistic 0.70, P = 0.001; HR: 8.0, 95% CI: 1.65-38.85, P = 0.010). PR prolongation strongly predicts new-onset ischemic stroke, MI, cardiovascular death, and combined cardiovascular endpoint including CHF in coronary patients or risk equivalent. Adverse vascular function may implicate an intermediate pathophysiological phenotype or mediating mechanism.

Synthesis and characterization of physical properties of Gd{sub 2}O{sub 2}S:Pr{sup 3+} semi-nanoflower phosphor

Energy Technology Data Exchange (ETDEWEB)

Bagheri, A.; Rezaee Ebrahim Saraee, Kh.; Shakur, H.R. [University of Isfahan, Department of Nuclear Engineering, Faculty of Advance Sciences and Technologies, Isfahan (Iran, Islamic Republic of); Zamani Zeinali, H. [Nuclear Science and Technology Research Institute, Agriculture, Medical and Industrial Research School, Karaj (Iran, Islamic Republic of)

2016-05-15

Pure gadolinium oxysulfide phosphor (Gd{sub 2}O{sub 2}S) and trivalent praseodymium-doped gadolinium oxysulfide phosphor (Gd{sub 2}O{sub 2}S:Pr{sup 3+}) scintillators with semi-nanoflower crystalline structures were successfully synthesized through a precipitation method and subsequent calcination treatment as a converter for X-ray imaging detectors. The characterization such as the crystal structures and nanostructure of Gd{sub 2}O{sub 2}S:Pr{sup 3+} scintillator measured by XRD and FeE-SEM experiment. The optical properties of Gd{sub 2}O{sub 2}S:Pr{sup 3+} scintillator were studied. Luminescence spectra of Gd{sub 2}O{sub 2}S:Pr{sup 3+} under 320 nm UV excitation show a green emission at near 511 nm corresponding to the {sup 3}P{sub 0}-{sup 3}H{sub 4} of Pr ions. After scintillation properties of synthesized Gd{sub 2}O{sub 2}S:Pr{sup 3+} scintillator investigated, Gd{sub 2}O{sub 2}S:Pr{sup 3+} scintillating film fabricated on a glass substrate by a sedimentation method. X-ray imaging of the fabricated scintillators confirmed that the Gd{sub 2}O{sub 2}S:Pr{sup 3+} scintillator could be used for radiography applications in which good spatial resolution is needed. (orig.)

Characterizations of Pr-doped Yb3Al5O12 single crystals for scintillator applications

Science.gov (United States)

Yoshida, Yasuki; Shinozaki, Kenji; Igashira, Takuya; Kawano, Naoki; Okada, Go; Kawaguchi, Noriaki; Yanagida, Takayuki

2018-04-01

Yb3Al5O12 (YbAG) single crystals doped with different concentrations of Pr were synthesized by the Floating Zone (FZ) method. Then, we evaluated their basic optical and scintillation properties. All the samples showed photoluminescence (PL) with two emission bands appeared approximately 300-500 nm and 550-600 nm due to the charge transfer luminescence of Yb3+ and intrinsic luminescence of the garnet structure, respectively. A PL decay profile of each sample was approximated by a sum of two exponential decay functions, and the obtained decay times were 1 ns and 3-4 ns. In the scintillation spectra, we observed emission peaks in the ranges from 300 to 400 nm and from 450 to 550 nm for all the samples. The origins of these emissions were attributed to charge transfer luminescence of Yb3+ and intrinsic luminescence of the garnet structure, respectively. The scintillation decay times became longer with increasing the Pr concentrations. Among the present samples, the 0.1% Pr-doped sample showed the lowest scintillation afterglow level. In addition, pulse height spectrum of 5.5 MeV α-rays was demonstrated using the Pr-doped YbAG, and we confirmed that all the samples showed a full energy deposited peak. Above all, the 0.1% Pr-doped sample showed the highest light yield with a value of 14 ph/MeV under α-rays excitation.

Synthesis and characterization of highly efficient and stable Pr6O11/Ag3PO4/Pt ternary hybrid structure

International Nuclear Information System (INIS)

Deng, Jiatao; Liu, Lin; Niu, Tongjun; Sun, Xiaosong

2017-01-01

Highlights: • Visible-light-driven Pr 6 O 11 /Ag 3 PO 4 /Pt photocatalysts were prepared. • Pr 6 O 11 /Ag 3 PO 4 /Pt showed highly efficient and stable photocatalystic activity. • The photocatalytic mechanism of Pr 6 O 11 /Ag 3 PO 4 /Pt composite was given. - Abstract: Ag 3 PO 4 is an excellent photocatalyst with high efficiency and quantum yield, but suffers from the fast recombination of photogenerated electron-hole pairs and photo-corrosion. Hereby, the highly efficient and stable visible-light-driven Pr 6 O 11 /Ag 3 PO 4 /Pt photocatalyst were prepared via a three-step wet chemical approach. The as-prepared Pr 6 O 11 /Ag 3 PO 4 /Pt composite was characterized by X-ray diffraction, US-vis diffuse reflectance spectroscopy, scanning electron microscopy, transmission electron microscopy, X-ray photoelectron spectroscopy, photoluminescence spectra and transient photocurrent as well. Comparing with single Pr 6 O 11 or Ag 3 PO 4 , the prepared Pr 6 O 11 /Ag 3 PO 4 /Pt composite exhibited much higher photocatalytic activity and stability for the degradation of Rhodamine B under visible light irradiation (>420 nm). The enhanced photocatalytic performance of Pr 6 O 11 /Ag 3 PO 4 /Pt composite has been attributed to the efficient separation of photo-generated electron-hole pairs through a scheme system composed of Pr 6 O 11, Ag 3 PO 4 and Pt.

75 FR 53963 - Notice of Baseline Filings: The Peoples Gas Light and Coke Company, Minnesota Energy Resources...

Science.gov (United States)

2010-09-02

... DEPARTMENT OF ENERGY Federal Energy Regulatory Commission [Docket No. PR10-86-000, Docket No. PR10-87-000, Docket No. PR10-88- 000, Docket No. PR10-89-000, Docket No. PR10-90-000] Notice of Baseline Filings: The Peoples Gas Light and Coke Company, Minnesota Energy Resources Corporation, Louisville Gas...

Electronic changes induced by μ+ in PrIn3: Muon-spin-rotation observation and crystalline-electric-field model calculation

International Nuclear Information System (INIS)

Tashma, T.; Amato, A.; Grayevsky, A.; Gygax, F.N.; Pinkpank, M.; Schenck, A.; Kaplan, N.

1997-01-01

Muon spin rotation in a single crystal of PrIn 3 reveals a significant influence of the implanted μ + on the local susceptibility χ 1 of the neighboring Pr +3 ions below ∼60K. It is found that χ 1 differs from χ bulk both in magnitude and in symmetry. All of the changes are accounted for by a model calculation based on crystalline-electric-field theory. The extent of the μ + -induced magnetic changes in the present system of PrIn 3 is rather modest compared to previously reported induced changes in PrNi 5 . However, the model-derived electronic-structure changes around the μ + in PrIn 3 appear remarkably similar to those in PrNi 5 , as is to be expected if the driving perturbation in both systems is primarily Coulombic in nature. copyright 1997 The American Physical Society

77 FR 31841 - Hope Gas, Inc.; Notice of Baseline Filing

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2012-05-30

... DEPARTMENT OF ENERGY Federal Energy Regulatory Commission [Docket No. PR12-23-001] Hope Gas, Inc.; Notice of Baseline Filing Take notice that on May 16, 2012, Hope Gas, Inc. (Hope Gas) submitted a revised baseline filing of their Statement of Operating Conditions for services provided under Section 311 of the...

77 FR 26535 - Hope Gas, Inc.; Notice of Baseline Filing

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2012-05-04

... DEPARTMENT OF ENERGY Federal Energy Regulatory Commission [Docket No. PR12-23-000] Hope Gas, Inc.; Notice of Baseline Filing Take notice that on April 26, 2012, Hope Gas, Inc. (Hope Gas) submitted a baseline filing of their Statement of Operating Conditions for services provided under Section 311 of the...

75 FR 33799 - EasTrans, LLC; Notice of Baseline Filing

Science.gov (United States)

2010-06-15

... DEPARTMENT OF ENERGY Federal Energy Regulatory Commission [Docket No. PR10-30-000] EasTrans, LLC; Notice of Baseline Filing June 8, 2010. Take notice that on June 4, 2010, EasTrans, LLC submitted a baseline filing of its Statement of Operating Conditions for services provided under section 311 of the...

The PR in PN for Education Associations. PR Bookshelf, No. 3.

Science.gov (United States)

National Education Association, Washington, DC.

This booklet presents suggestions and guidelines for the effective use of public relations (PR) techniques during professional negotiations (PN) among teachers, administrators, and boards of education. Introductory sections present the National Education Association (NEA) position regarding professional negotiation and grievance procedures and…

75 FR 66748 - Notice of Baseline Filings

Science.gov (United States)

2010-10-29

...- 000] Notice of Baseline Filings October 22, 2010. ONEOK Gas Transportation, L.L.C Docket No. PR11-68... above submitted a revised baseline filing of their Statement of Operating Conditions for services...

Substitutions of PrP N-terminal histidine residues modulate scrapie disease pathogenesis and incubation time in transgenic mice.

Science.gov (United States)

Eigenbrod, Sabina; Frick, Petra; Bertsch, Uwe; Mitteregger-Kretzschmar, Gerda; Mielke, Janina; Maringer, Marko; Piening, Niklas; Hepp, Alexander; Daude, Nathalie; Windl, Otto; Levin, Johannes; Giese, Armin; Sakthivelu, Vignesh; Tatzelt, Jörg; Kretzschmar, Hans; Westaway, David

2017-01-01

Prion diseases have been linked to impaired copper homeostasis and copper induced-oxidative damage to the brain. Divalent metal ions, such as Cu2+ and Zn2+, bind to cellular prion protein (PrPC) at octapeptide repeat (OR) and non-OR sites within the N-terminal half of the protein but information on the impact of such binding on conversion to the misfolded isoform often derives from studies using either OR and non-OR peptides or bacterially-expressed recombinant PrP. Here we created new transgenic mouse lines expressing PrP with disrupted copper binding sites within all four histidine-containing OR's (sites 1-4, H60G, H68G, H76G, H84G, "TetraH>G" allele) or at site 5 (composed of residues His-95 and His-110; "H95G" allele) and monitored the formation of misfolded PrP in vivo. Novel transgenic mice expressing PrP(TetraH>G) at levels comparable to wild-type (wt) controls were susceptible to mouse-adapted scrapie strain RML but showed significantly prolonged incubation times. In contrast, amino acid replacement at residue 95 accelerated disease progression in corresponding PrP(H95G) mice. Neuropathological lesions in terminally ill transgenic mice were similar to scrapie-infected wt controls, but less severe. The pattern of PrPSc deposition, however, was not synaptic as seen in wt animals, but instead dense globular plaque-like accumulations of PrPSc in TgPrP(TetraH>G) mice and diffuse PrPSc deposition in (TgPrP(H95G) mice), were observed throughout all brain sections. We conclude that OR and site 5 histidine substitutions have divergent phenotypic impacts and that cis interactions between the OR region and the site 5 region modulate pathogenic outcomes by affecting the PrP globular domain.

Upconversion excitations in Pr3+-doped BaY2F8 crystal

Science.gov (United States)

Piramidowicz, R.; Mahiou, R.; Boutinaud, P.; Malinowski, M.

2011-09-01

We report the orange-to-blue and infrared-(IR)-to-blue wavelengths upconversion luminescence in Pr3+:BaY2F8 crystals. Mechanism of the orange light upconversion into blue 3P0 state emission was confirmed to be energy transfer between two Pr3+ ions in the 1D2 state. IR-to-blue upconversion has only been observed under two different color IR pumping. The first resonant step was the 3H4→1G4 ground state absorption transition, and the second resonant transition was the excited state absorption from the 1G4 to 1I6 and 3PJ levels. A comparison of the efficiency of the IR-to-blue upconversion in several praseodymium activated host is presented and discussed. A model of the IR pumped upconversion praseodymium blue laser is presented and the population inversion conditions are calculated.

78 FR 6316 - Enterprise Texas Pipeline LLC; Notice of Compliance Filing

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2013-01-30

... DEPARTMENT OF ENERGY Federal Energy Regulatory Commission [Docket No. PR13-23-000] Enterprise Texas Pipeline LLC; Notice of Compliance Filing Take notice that on January 17, 2013, Enterprise Texas Pipeline LLC filed a revised Statement of Operating Conditions to comply with a Commission order issued in...

75 FR 70732 - Enterprise Texas Pipeline LLC; Notice of Baseline Filing

Science.gov (United States)

2010-11-18

... DEPARTMENT OF ENERGY Federal Energy Regulatory Commission [Docket No. PR10-92-001] Enterprise Texas Pipeline LLC; Notice of Baseline Filing November 10, 2010. Take notice that on November 9, 2010, Enterprise Texas Pipeline LLC submitted a revised baseline filing of its Statement of Operating Conditions...

Leaf-specific pathogenesis-related 10 homolog, PgPR-10.3, shows in silico binding affinity with several biologically important molecules

Directory of Open Access Journals (Sweden)

Jin Haeng Han

2015-10-01

Conclusion: Although ginseng PR-10.3 gene is expressed in all organs of 3-wk-old plantlets, its expression is restricted to leaves in mature 2-yr-old ginseng plants. The putative binding property of PgPR-10.3 with Re is intriguing. Further verification of binding affinity with other biologically important molecules in the large hydrophobic cavity of PgPR-10.3 may provide an insight into the biological features of PR-10 proteins.

Superstructure formation in PrNi{sub 2}Al{sub 3} and ErPd{sub 2}Al{sub 3}

Energy Technology Data Exchange (ETDEWEB)

Eustermann, Fabian; Hoffmann, Rolf-Dieter [Muenster Univ. (Germany). Inst. fuer Anorganische und Analytische Chemie; Janka, Oliver [Muenster Univ. (Germany). Inst. fuer Anorganische und Analytische Chemie; Oldenburg Univ. (Germany). Inst. fuer Chemie

2017-09-01

The intermetallic phase ErPd{sub 2}Al{sub 3} was obtained by arc-melting of the elements and subsequent annealing for crystal growth. The sample was studied by X-ray diffraction on powders and single crystals. The structure of ErPd{sub 2}Al{sub 3} was refined from X-ray diffraction data and revealed a superstructure of PrNi{sub 2}Al{sub 3} - a CaCu{sub 5} derivative (P6/m, a=1414.3(1), c=418.87(3) pm wR=0.0820, 1060 F{sup 2} values, 48 variables). The same superstructure was subsequently found for PrNi{sub 2}Al{sub 3} (P6/m, a=1407.87(4), c=406.19(2) pm, wR=0.0499, 904 F{sup 2} values, 47 variables). In the crystal structure, the aluminium and transition metal atoms form a polyanionic network according to [T{sub 2}Al{sub 3}]{sup δ-}, while rare earth atoms fill cavities within the networks. They are coordinated by six transition metal and twelve aluminum atoms. In contrast to the PrNi{sub 2}Al{sub 3} type structure reported so far, two crystallographic independent rare-earth sites are found of which one (1b) is shifted by 1/2 z, causing a distortion in the structure along with a recoloring of the T and Al atoms in the network.

Effect of electromagnetic and phonon pulses on a photon echo in LaF3: Pr3+

International Nuclear Information System (INIS)

Shegeda, A.M.; Khabibullin, B.M.; Lisin, V.N.

1995-01-01

The effect of electromagnetic-field pulses of the nanosecond duration on the inverted two-pulse, three-pulse, and long-lived three-pulse photon echoes in LaF 3 :Pr 3+ is studied. The eletromagnetic pulses were produced by a current pulse flowing through a thin metal film evaporated on the sample surface parallel to the C 3- axis. A strong decrease in echo signals is observed, even if the eletromagnetic pulses were switched on prior to laser pulses. The experimental results can be qualitatively interpreted under the assumption that during the flowing of current through the metal film, the generation of transverse acoustic and electromagnetic fields occurs that induces the pseudo-Stark splitting of energy levels of Pr 3+ ions and, as a consequence, the decrease in echo signals, if the current was switched on prior to or, correspondingly, at the instant of the action of the laser pulses. 12 refs., 5 figs

Luminescent characteristics of UV excited Sr{sub 0.5}Ca{sub 0.5}TiO{sub 3}: Pr{sup 3+} reddish-orange phosphor

Energy Technology Data Exchange (ETDEWEB)

Vidyadharan, Viji; Mohan P, Remya; Joseph, Cyriac; Unnikrishnan, N.V.; Biju, P.R., E-mail: prb.mgu@gmail.com

2016-02-15

Pr{sup 3+} doped Sr{sub 0.5}Ca{sub 0.5}TiO{sub 3} phosphors were synthesised by solid state reaction process. The structure, surface morphology and photoluminescence of the prepared phosphors were analysed using XRD, SEM and photoluminescence spectroscopy respectively. The XRD pattern confirmed orthorhombic perovskite structure of the Sr{sub 0.5}Ca{sub 0.5}TiO{sub 3}: x Pr{sup 3+} phosphor. Agglomeration of particles with irregular shapes is observed from the SEM images. The emission spectra of Sr{sub 0.5}Ca{sub 0.5}TiO{sub 3}: x Pr{sup 3+} phosphor shows the samples can be effectively excited with UV light at 336 nm and exhibit a strong reddish-orange emission at 611 nm. Concentration dependence of emission intensity shows concentration quenching effect on increasing Pr{sup 3+} concentration after x = 0.1 because of dipole–dipole interaction. Using Blasse's formula, critical distance for energy transfer was calculated. The CIE co-ordinates, CCT, colour purity and luminescence decay of the prepared phosphors were also calculated. These results offer the prepared phosphor as a suitable candidate for various photonic applications. - Highlights: • Sr{sub 0.5}Ca{sub 0.5}TiO{sub 3}: x Pr{sup 3+} perovskite structured phosphors were synthesized. • Under UV excitation, the PL spectra show strong reddish-orange emission. • The emission from {sup 3}P{sub J} levels of Pr{sup 3+} were absent due to the presence of IVCT band. • Concentration quenching due to dipole–dipole interaction was observed. • For x = 0.1, sample shows a maximum emission intensity with 91.7% colour purity.

Thermally stimulated luminescence and persistent luminescence of β-irradiated YAG:Pr"3"+ nanophosphors produced by combustion synthesis

International Nuclear Information System (INIS)

Santacruz-Gomez, K.; Meléndrez, R.; Gil-Tolano, M.I.; Jimenez, J.A.; Makale, M.T.; Barboza-Flores, M.; Castaneda, B.; Soto-Puebla, D.; Pedroza-Montero, M.; McKittrick, J.; Hirata, G.A.

2016-01-01

In this work, the thermally stimulated luminescence (TSL) and persistent luminescence (PLUM) properties of praseodymium doped yttrium aluminum garnet (YAG:Pr"3"+) exposed to β-irradiation are reported. X-ray diffraction (XRD) confirms a single phase of YAG obtained by the combustion method. Transmission electron microscopy (TEM) shows that powder particles appear to be irregular crystals with an average size of 67 nm. TSL glow-curve deconvolution of YAG:Pr"3"+ after β-irradiation consist in six peaks centered at 394, 450, 467, 543, 637 and 705 K. The TSL fading and PLUM signals were found to be associated with at least with two different kinds of traps, corresponding to the peaks located at 394, 450 and 467 K. YAG:Pr"3"+ nanophosphors analyzed in this work showed interesting features about the dosimetric sensitivity as well as the reproducibility for both TSL/PLUM techniques, with good linearity dose response. These results indicate that nanocrystalline YAG:Pr3"+ is a good candidate for dosimetric applications in the range of 80 mGy-20 Gy. - Highlights: • β-irradiated YAG:Pr"3"+ TSL consist in 394, 450, 467, 543, 637 and 705 K peaks. • YAG:Pr"3"+ is a good candidate for dosimetry in the range of 80 mGy-20 Gy. • PLUM can be potentially used for in vivo, in situ and quasi in real time dosimetry.

PrP Conformational Transitions Alter Species Preference of a PrP-specific antibody

NARCIS (Netherlands)

Zou, W.Q.; Langeveld, J.P.M.; Xiao, X.; Chen, S.; McGeer, P.L.; Yuan, J.; Payne, M.C.; Kang, H.E.; McGeehan, J.M.; Sy, M.S.; Greenspan, N.S.; Kaplan, D.; Wang, G.X.; Parchi, P.; Hoover, E.A.; Kneale, G.; Telling, G.; Surewicz, W.; Kong, Q.; Guo, J.

2010-01-01

The epitope of the 3F4 antibody most commonly used in human prion disease diagnosis is believed to consist of residues Met-Lys-His-Met (MKHM) corresponding to human PrP-(109–112). This assumption is based mainly on the observation that 3F4 reacts with human and hamster PrP but not with PrP from

Energy transfer and thermal studies of Pr 3+ doped cerium oxalate ...

Indian Academy of Sciences (India)

The analysis of energy level diagrams of cerium and praseodymium ions indicates that the energy gap between the sensitizer and the activator ions varies in a small range suggesting a possible energy transfer from the Ce3+ to Pr3+. The emission and absorption spectra of these crystals were recorded. The overlapping of ...

Temperature dependence of colossal electro-resistance of Pr0.7Ca0.3MnO3 thin films

International Nuclear Information System (INIS)

Odagawa, A.; Kanno, T.; Adachi, H.; Sato, H.; Inoue, I.H.; Akoh, H.; Kawasaki, M.; Tokura, Y.

2005-01-01

The electronic conduction through a Pr 0.7 Ca 0.3 MnO 3 thin film is investigated by measurements using dc and pulsed bias. Pr 0.7 Ca 0.3 MnO 3 films sandwiched by electrodes exhibit two stable resistance states by means of applying voltage pulses. Both of the states show semiconducting behavior. The ratio of the two resistance states induces a colossal electro-resistance (CER) effect greater than 1000%. The CER behavior is seen in the temperature range of 300 K down to 150 K. The observed conduction characteristics exhibit the space-charge-limited-current effect, and the switching behavior can be ascribed to a carrier trapping/detrapping of the trap sites in the perovskite manganite

75 FR 28602 - Corning Natural Gas Corporation; Notice of Compliance Filing

Science.gov (United States)

2010-05-21

... DEPARTMENT OF ENERGY Federal Energy Regulatory Commission [Docket No. PR09-30-003] Corning Natural Gas Corporation; Notice of Compliance Filing May 17, 2010. Take notice that on May 10, 2010, Corning Natural Gas Corporation, (Corning) filed a corrected rate sheet to replace the rate sheet filed with its...

75 FR 38802 - DCP Raptor Pipeline, LLC; Notice of Baseline Filing

Science.gov (United States)

2010-07-06

... DEPARTMENT OF ENERGY Federal Energy Regulatory Commission [Docket No. PR10-42-000] DCP Raptor Pipeline, LLC; Notice of Baseline Filing June 28, 2010. Take notice that on June 22, 2010, DCP Raptor Pipeline, LLC submitted a baseline filing of its Statement of Operating Conditions for services provided...

Monoclinic superstructure of Pr{sub 3}Rh{sub 4}Ge{sub 4}

Energy Technology Data Exchange (ETDEWEB)

Vosswinkel, Daniel; Hoffmann, Rolf-Dieter; Greiwe, Magnus; Eul, Matthias; Poettgen, Rainer [Muenster Univ. (Germany). Inst. fuer Anorganische und Analytische Chemie

2016-07-01

Pr{sub 3}Rh{sub 4}Ge{sub 4} was synthesized by melting of the elements in an arc-melting furnace followed by annealing in a sealed tantalum ampoule in a muffle furnace. Structure refinement was based on temperature dependent single-crystal X-ray diffractometer data. At ambient temperature Pr{sub 3}Rh{sub 4}Ge{sub 4} adopts the U{sub 3}Ni{sub 4}Si{sub 4} type structure with strongly enhanced anisotropic displacement parameters for Rh1. Below 230 K additional reflections start to appear and at 110 K the structure could be described with the (3+1)D superspace group I2/m(α0γ)00; α=1/2, γ=1/2; (Z=2). This commensurately modulated structure could be refined with 1448 F{sup 2} values, 39 variables and residuals of wR=0.0417 for the main reflections and wR=0.1520 for the satellites of 1{sup st} order, [a=408.36(2), b=421.12(3) and c=2504.4(2) pm]. The commensurate description could be transformed to a 3D supercell with space group A2/m and Z=4: a=816.72(2), b=421.12(3), c=2537.5(1) pm, β=99.26(1) , 1448 F{sup 2} values, 69 variables and wR=0.0499. The relation of the U{sub 3}Ni{sub 4}Si{sub 4} type structure, the (3+1)D modulated and the 3D supercell is discussed on the basis of a group-subgroup scheme. Temperature dependent magnetic susceptibility data reveal Curie-Weiss paramagnetism with an experimental moment of 3.72(2) μ{sub B}/Pr atom and a Weiss constant of -12.6(5) K. No magnetic ordering is evident down to 3 K.

Conductivity and electrochemical characterization of PrFe1-xNixO3-δ at high temperature

DEFF Research Database (Denmark)

Hashimoto, Shin-Ichi; Kammer Hansen, Kent; Poulsen, Finn Willy

2007-01-01

PrFe(1-x)NixO(3)- (x=0.4-0.6) compounds were synthesized and characterized by powder XRD, electrical conductivity and electrochemical impedance spectroscopy on point electrodes on a Ce0.9Gd0.1O2-delta (CGO10) electrolyte. As a reference, the electrochemical performance of LaFe(0.4)AM(0.6)O(3-delta......) was also measured. The main phase in the PrFe1-xNixO3-delta series was perovskite-type structure and belonged to the orthorhombic crystal system. The conductivities are fairly high, e.g. around 220 S cm(-1) at 873 K for the x = 0.4 compound. The electrochemical performance of the PrFe(1-x)NixO(3-delta...

78 FR 7331 - SLR; Fajardo Offshore Grand Prix; Rada Fajardo; Fajardo, PR

Science.gov (United States)

2013-02-01

... DEPARTMENT OF HOMELAND SECURITY Coast Guard 33 CFR Part 100 [Docket Number USCG-2012-1098] RIN 1625-AA08 SLR; Fajardo Offshore Grand Prix; Rada Fajardo; Fajardo, PR AGENCY: Coast Guard, DHS. ACTION: Notice of Proposed Rulemaking. SUMMARY: The Coast Guard is establishing a special local regulation on the...

[Radioactive nuclides in the marine environment--distribution and behaviour of 95Zr, 95Nb originated from fallout].

Science.gov (United States)

Yamato, A; Miyagawa, N; Miyanaga, N

1984-07-01

To investigate behaviour of 95Zr, 95Nb in the marine environment, various samples have been collected and measured by means of Ge(Li) gamma-ray spectrometry and/or radiochemical analysis during a period from 1974 to 1982 at coastal area of Tokai-mura, Ibaraki prefecture. Concentration of the nuclides in seaweeds increased remarkably after atmospheric nuclear detonation by P.R. of China, and the activity ratio between the nuclides changed by time was not fit well by the transient decay equation. Concentration variation in sea water was smaller than that in sea weeds, and the minimum change in sea sediment. Increase of concentration in these environmental samples was observed in chronological order of sea water, sea weeds then sediment after detonations, suggesting that the uptake of the nuclides by these sea weeds from sea water is faster than that via root. Observed concentration factors on the nuclides by sea weeds were calculated from the observed concentrations in sea water and sea weeds. Maximum values on 95Zr and 95Nb were 2110, 2150, respectively for Ecklonia cava and Eisenia bicyclis.

Interaction of xenone difluoride with the fluorocomplexes of lanthanides and rubidium of the Rb3M3F6 composition

International Nuclear Information System (INIS)

Goryachenkov, S.A.; Fadeeva, N.E.; Kiselev, Yu.M.; Martynenko, L.I.; Spitsyn, V.I.

1984-01-01

The possibility of preparing rubidium fluorocomplexes of tetravalent lanthanides of the Rb 3 M 4 F 7 composition from Rb 3 M 3 F 6 (M 3 =Ce, Pr, Nd, Sm, Gd, Tb, Dy, Ho, Er, Tm, Yb) with XeF 2 has been studied. By the DTA method it is shown that Ce and Pr salts are fluorinated respectively at approximately 100 and approximately 235 deg C with a noticeable exoeffect. Tb and Dy salts fluorination proceeds with considerable kinetic difficulties. The fluorination products composition, Rb 3 M 4 F 7 (M 4 =Ce, Pr, Tb, Dy) is confirmed by the methods of chemical, IR-spectroscopic and X-ray phase analyses. XeF 2 interaction with Rb 3 M 3 F 6 salts of other lanthanides up to 400 deg C has not been observed

76 FR 14653 - BOST3 Hydroelectric Company, LLC (BOST3); Notice of Application Accepted for Filing and...

Science.gov (United States)

2011-03-17

... Hydroelectric Company, LLC (BOST3); Notice of Application Accepted for Filing and Soliciting Motions To Intervene and Protests Take notice that the following hydroelectric application has been filed with the... No.: P-12756-003. c. Date filed: July 26, 2010. d. Applicant: BOST3 Hydroelectric Company, LLC (BOST3...

Luminescence and energy transfer in Lu3Al5O12 scintillators co-doped with Ce3+ and Pr3+

NARCIS (Netherlands)

Ogiegło, J.M.; Zych, A.K.; Jüstel, T.; Meijerink, A.; Ronda, R.C.

2013-01-01

Lu3Al5O12:Ce3+ (LuAG:Ce) is a scintillator with a fast response time. The light yield is lower than theoretically expected and to increase the light yield co-doping with Pr3+ is investigated. To better understand the energy flow to the Ce3+ ion, first low temperature emission and excitation spectra

Magnetic properties and structural transitions of fluorite-related rare earth osmates Ln3OsO7 (Ln=Pr, Tb)

International Nuclear Information System (INIS)

Hinatsu, Yukio; Doi, Yoshihiro

2013-01-01

Ternary rare-earth osmates Ln 3 OsO 7 (Ln=Pr, Tb) have been prepared. They crystallize in an ortho-rhombic superstructure of cubic fluorite with space group Cmcm. Both of these compounds undergo a structural phase transition at 130 K (Ln=Pr) and 580 K (Ln=Tb). These compounds show complex magnetic behavior at low temperatures. Pr 3 OsO 7 exhibits magnetic transitions at 8 and 73 K, and Tb 3 OsO 7 magnetically orders at 8 and 60 K. The Os moments become one-dimensionally ordered, and when the temperature is furthermore decreased, it provokes the ordering in the Ln 3+ sublattice that simultaneously becomes three-dimensionally ordered with the Os sublattice. - Graphical abstract: Ternary rare-earth osmates Ln 3 OsO 7 (Ln=Pr, Tb) have been prepared. They crystallize in an orthorhombic superstructure of cubic fluorite with space group Cmcm. Both of these compounds undergo a structural phase transition at 130 K (Ln=Pr) and 580 K (Ln=Tb). These compounds show complex magnetic behavior at low temperatures. Pr 3 OsO 7 exhibits magnetic transitions at 8 and 73 K, and Tb 3 OsO 7 magnetically orders at 8 and 60 K. Highlights: ► Ternary rare-earth osmates Ln 3 OsO 7 (Ln=Pr, Tb) with an ordered defect-fluorite structure have been prepared. ► Both of these compounds undergo a structural phase transition at 130 K (Ln=Pr) and 580 K (Ln=Tb). ► These compounds show complex magnetic behavior at low temperatures due to magnetic ordering of Ln and Os.

49 CFR 1110.3 - Publication of notices.

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2010-10-01

... needed and what they are intended to accomplish; (3) Identification of significant dates in the... controlling for the purpose of determining time periods set by these procedures or by notices issued in...

77 FR 21760 - Atmos Energy Colorado/Kansas Division; Notice of Baseline Filing

Science.gov (United States)

2012-04-11

... DEPARTMENT OF ENERGY Federal Energy Regulatory Commission [Docket No. PR12-19-000] Atmos Energy Colorado/Kansas Division; Notice of Baseline Filing Take notice that on March 30, 2012, Atmos Energy Colorado/Kansas Division (Atmos) submitted a baseline filing of their Statement of Operating Conditions for...

Effects of Er3+ and Pr3+ Substitution on Structural, Dielectric, Ferroelectric and Photoluminescence Properties of the BaTi0.9Zr0.1O3 Ceramic

Science.gov (United States)

Zouari, I.; Sassi, Z.; Seveyrat, L.; Perrin, V.; Zghal, S.; Abdelmoula, N.; Lebrun, L.; Khemakhem, H.

2017-07-01

BaTi0.9Zr0.1O3 (BZT), Ba1- x Ln2 x/3□ x/3Ti0.9Zr0.1O3 (with x = 0.5% mol and Ln = Er3+) (BZT-Er) and Ba1- x Ln2 x/3□ x/3Ti0.9Zr0.1O3 (with x = 0.5% mol and Ln = Pr3+) (BZT-Pr) were prepared via the conventional solid-state reaction method. X-ray diffraction showed that all these ceramics were in the single perovskite phase at room temperature (RT). The temperature dependence of dielectric behavior was investigated in the temperature range 25-225°C and exhibited a classical ferroelectric behavior. A slight decrease of the Curie temperature ( T C) with Pr3+ and Er3+ substitution was observed in addition to an increase in the maximum dielectric permittivity ( \\varepsilon_{r {max} }^' }} ) of about 40% for the BZT-Er. At RT, the ferroelectric and piezoelectric coefficients were decreased for BZT-Pr, but were maintained for BZT-Er with a piezoelectric coefficient ( d 33) of 185 pC/N, a planar electromechanical coupling factor of 30%, and a remanent polarization of 11.6 μC/cm2. The Raman bands as a function of temperature confirmed the paraelectric-ferroelectric phase transition of all those ceramics. The photoluminescence spectra showed that strong red (615 nm and 645 nm) and bright green (523 nm and 545 nm) emission bands were obtained, under excitation by laser at 488 nm at RT, for BZT-Pr and BZT-Er, respectively. These multifunctional materials showed a significant technological promise in coupling device applications.

Synthesis of Non-uniformly Pr-doped SrTiO3 Ceramics and Their Thermoelectric Properties

KAUST Repository

Mehdizadeh Dehkordi, Arash; Bhattacharya, Sriparna; Darroudi, Taghi; Zeng, Xiaoyu; Alshareef, Husam N.; Tritt, Terry M.

2015-01-01

We demonstrate a novel synthesis strategy for the preparation of Pr-doped SrTiO3 ceramics via a combination of solid state reaction and spark plasma sintering techniques. Polycrystalline ceramics possessing a unique morphology can be achieved by optimizing the process parameters, particularly spark plasma sintering heating rate. The phase and morphology of the synthesized ceramics were investigated in detail using X-ray diffraction, scanning electron microcopy and energy-dispersive X-ray spectroscopy It was observed that the grains of these bulk Pr-doped SrTiO3 ceramics were enhanced with Pr-rich grain boundaries. Electronic and thermal transport properties were also investigated as a function of temperature and doping concentration Such a microstructure was found to give rise to improved thermoelectric properties. Specifically, it resulted in a significant improvement in carrier mobility and the thermoelectric power factor. Simultaneously, it also led to a marked reduction in the thermal conductivity. As a result, a significant improvement (> 30%) in the thermoelectric figure of merit was achieved for the whole temperature range over all previously reported maximum values for SrTiO3-based ceramics. This synthesis demonstrates the steps for the preparation of bulk polycrystalline ceramics of non-uniformly Pr-doped SrTiO3.

Synthesis of Non-uniformly Pr-doped SrTiO3 Ceramics and Their Thermoelectric Properties

KAUST Repository

Mehdizadeh Dehkordi, Arash

2015-08-15

We demonstrate a novel synthesis strategy for the preparation of Pr-doped SrTiO3 ceramics via a combination of solid state reaction and spark plasma sintering techniques. Polycrystalline ceramics possessing a unique morphology can be achieved by optimizing the process parameters, particularly spark plasma sintering heating rate. The phase and morphology of the synthesized ceramics were investigated in detail using X-ray diffraction, scanning electron microcopy and energy-dispersive X-ray spectroscopy It was observed that the grains of these bulk Pr-doped SrTiO3 ceramics were enhanced with Pr-rich grain boundaries. Electronic and thermal transport properties were also investigated as a function of temperature and doping concentration Such a microstructure was found to give rise to improved thermoelectric properties. Specifically, it resulted in a significant improvement in carrier mobility and the thermoelectric power factor. Simultaneously, it also led to a marked reduction in the thermal conductivity. As a result, a significant improvement (> 30%) in the thermoelectric figure of merit was achieved for the whole temperature range over all previously reported maximum values for SrTiO3-based ceramics. This synthesis demonstrates the steps for the preparation of bulk polycrystalline ceramics of non-uniformly Pr-doped SrTiO3.

The influence of post-preparation annealing atmospheres on the optical properties and energy transfer between Pr3+ and Dy3+ in mixed lanthanum-yttrium oxyorthosilicate hosts

Science.gov (United States)

Ogugua, Simon N.; Swart, Hendrik C.; Ntwaeaborwa, Odireleng M.

2018-02-01

The effect of post-annealing atmospheres (air and Ar-H2) on the optical properties of La2-xYxSiO5 (x = 0, 0.5, 1, 1.5 and 2) co-doped 0.25Pr3+ and 0.25Dy3+ powder phosphors were studied. The X-ray diffraction patterns showed that the as-prepared samples have higher full width at half maximum (FWHM) than the annealed samples. The elemental composition, oxidation states, and chemical and electronic states of the phosphors were determined using the X-ray photoelectron spectroscopy. The band gap values determined from the diffuse reflectance spectra were shown to increase following the post-annealing treatments (with the values increasing in the following manner: Ar-H2-annealed > air-annealed > as-prepared). The photoluminescence intensities of the phosphors also followed the same trend as the band gap values. Two different cases of the photoluminescence mechanisms were proposed for the La2-xYxSiO5:0.25Pr3+,0.25Dy3+ phosphors. Case 1: The 4f5d energy level of Pr3+ lies within the band gap of the host and energy transfer was observed from Pr3+ to Dy3+ via the overlapping 4f5d emission peak of Pr3+ and the 4I15/2 excitation peak of Dy3+. Case II: The 4f5d energy level of Pr3+ lies close or inside the conduction band of the host and the energy transfer was not observed from Pr3+ to Dy3+. The CIE colour coordinates of the phosphors showed tunable emission colours (blue, red and white).

Growth and luminescence properties of Pr3+-doped single crystalline films of garnets and perovskites

International Nuclear Information System (INIS)

Gorbenko, V.; Zorenko, Yu.; Savchyn, V.; Zorenko, T.; Pedan, A.; Shkliarskyi, V.

2010-01-01

Peculiarities of growth of single crystalline films (SCF) of Pr 3+ doped Y 3 Al 5 O 12 and Lu 3 Al 5 O 12 garnets and YAlO 3 and LuAlO 3 perovskites by the liquid phase epitaxy method from melt-solutions based on PbO-B 2 O 3 flux as well as luminescent and scintillation properties of these SCFs were studied in this work. Dependence the intensity of the Pr 3+ d-f and f-f-luminescence on the activator concentration and influence of Pb 2+ flux dopant on the light yield of SCFs of the mentioned garnets and perovskites were analyzed.

Validation of PR interval length as a criterion for development of atrial fibrillation in non-Hispanic whites, African Americans and Hispanics.

Science.gov (United States)

Shulman, Eric; Aagaard, Philip; Kargoli, Faraj; Hoch, Ethan; Zheng, Laura; Di Biase, Luigi; Fisher, John; Gross, Jay; Kim, Soo; Ferrick, Kevin; Krumerman, Andrew

2015-01-01

PR interval prolongation on electrocardiogram (ECG) increases the risk of atrial fibrillation (AF). Non-Hispanic Whites are at higher risk of AF compared to African Americans and Hispanics. However, it remains unknown if prolongation of the PR interval for the development of AF varies by race/ethnicity. Therefore, we determined whether race affects the PR interval length's ability to predict AF and if the commonly used criterion of 200 ms in AF prediction models can continue to be used for non-White cohorts. This is a retrospective epidemiological study of consecutive inpatient and outpatients. An ECG database was initially interrogated. Patients were included if their initial ECG demonstrated sinus rhythm and had two or more electrocardiograms and declared a race and/or ethnicity as non-Hispanic White, African American or Hispanic. Development of AF was stratified by race/ethnicity along varying PR intervals. Cox models controlled for age, gender, race/ethnicity, systolic blood pressure, BMI, QRS, QTc, heart rate, murmur, treatment for hypertension, heart failure and use of AV nodal blocking agents to assess PR interval's predictive ability for development of AF. 50,870 patients met inclusion criteria of which 5,199 developed AF over 3.72 mean years of follow-up. When the PR interval was separated by quantile, prolongation of the PR interval to predict AF first became significant in Hispanic and African Americans at the 92.5th quantile of 196-201 ms (HR: 1.42, 95% CI: 1.09-1.86, p=0.01; HR: 1.32, 95% CI: 1.07-1.64, p=0.01, respectively) then in non-Hispanic Whites at the 95th quantile at 203-212 ms (HR: 1.24, 95% CI: 1.24-1.53, p=0.04). For those with a PR interval above 200 ms, African Americans had a lower risk than non-Hispanic Whites to develop AF (HR: 0.80, 95% CI: 0.64-0.95, p=0.012), however, no significant difference was demonstrated in Hispanics. This is the first study to validate a PR interval value of 200 ms as a criterion in African Americans and

Electronic structure of PrBa2Cu3O7 within LSDA+U: Different self-consistent solutions

Directory of Open Access Journals (Sweden)

M R Mohammadizadeh

2009-08-01

Full Text Available  Based on the density functional theory and using the full-potential linearized augmented-plane-waves method the electronic structure of PrBa2Cu3O7 (Pr123 system was calculated. The rotationally invariant local spin density approximation plus Hubbard parameter U was employed for Pr(4f orbitals. One self-consistent solution more stable than the previous solution, which has been proposed by Liechtenstein and Mazin (LM, was found. In contrast to the LM solution, it can explain the results of the 17O NMR spectroscopy study of nonsuperconducting Pr123 samples. This new solution favors the suggestion that the pure Pr123 samples should be intrinsically superconductor and metal similar to the other RBa2Cu3O7 (R=Y or a rare earth element samples. The imperfections cause the superconducting holes are transferred to the nonsuperconducting hole states around the high-symmetry (π/a, π/b, kz line in the Brillouin zone and so, superconductivity is suppressed in the conventional samples. It predicts that the superconducting 2pσ holes in the O2 sites of nonsuperconducting Pr123 samples should be depleted and the ones in the O3 sites should be almost unchanged .

Sensitizing effects of ZnO quantum dots on red-emitting Pr3+-doped SiO2 phosphor

CSIR Research Space (South Africa)

Mbule, PS

2012-05-01

Full Text Available In this study, red cathodoluminescence (CL) ( emission=614 nm) was observed from Pr3+ ions in a glassy (amorphous) SiO2 host. This emission was enhanced considerably when ZnO quantum dots (QDs) were incorporated in the SiO2:Pr3+ suggesting...

A novel 3D nanoarchitecture of PrVO4 phosphor: Selective synthesis, characterization, and luminescence behavior

International Nuclear Information System (INIS)

Thirumalai, J.; Chandramohan, R.; Vijayan, T.A.

2011-01-01

Graphical abstract: Nanostructures of tetragonal PrVO 4 with novel 3D hierarchical architectures self-assembled nanorods were successfully synthesized by a hydrothermal method in ethylenediamine tetra-acetic acid (EDTA) mediated processes are ideal functional components for next generation luminescent devices. Research highlights: → Synthesis of self-assembled 3D nanoarchitecture of PrVO 4 phosphor. → Using template-free hydrothermal method. → pH, temperature and capping molecules control morphology of the products. → Detailed structural, morphology and luminescence were studied. - Abstract: Nanostructures of tetragonal PrVO 4 with novel 3D hierarchical architectures self-assembled nanorods were successfully synthesized by a hydrothermal method in ethylenediamine tetra-acetic acid (EDTA) mediated processes. Comprehensive structural, morphological studies like X-ray diffraction, scanning and transmission electron microscopy were employed to characterize the as-obtained products. In the hydrothermal process, EDTA not only acts as a chelating reagent to facilitate the formation of PrVO 4 , but also acts as a surface capping agent to adhere to the newly created surface and to promote the crystal splitting. The formation mechanisms of nanorods to hierarchical architectures were proposed on the basis of a series of surfactant and time-dependent experiments. Photoluminescence (PL) studies of PrVO 4 showed strong red emission upon UV illumination, and this implied potential application in the luminescent field. A possible growth mechanism of the sheaf-like PrVO 4 hierarchical nanocrystals is proposed and discussed.

Photoluminescence characteristics of Li-doped CaTiO{sub 3}:Pr{sup 3+} thin films grown on Si (100) substrate by PLD

Energy Technology Data Exchange (ETDEWEB)

Yang, Hyun Kyoung; Chung, Jong Won; Moon, Byung Kee; Choi, Byung Chun [Department of Physics, Pukyong National University, Busan 608-737 (Korea, Republic of); Jeong, Jung Hyun, E-mail: jhjeong@pknu.ac.k [Department of Physics, Pukyong National University, Busan 608-737 (Korea, Republic of); Jang, Ki-wan; Lee, Ho Sueb [Department of Physics, Changwon National University, Changwon 641-773 (Korea, Republic of); Yi, Soung Soo [Department of Electronic Materials Engineering, Silla University, Busan, 617-736 (Korea, Republic of); Kim, Kwang Ho [School of Materials Science and Engineering, Pusan National University, Busan, 609-735 (Korea, Republic of)

2010-09-01

The effects of Li-doped CaTiO{sub 3}:Pr{sup 3+} thin films have been investigated by varying the lithium ion concentrations from 0 to 5 wt.%. The films have been deposited on Si (100) substrate using a pulsed laser deposition technique. Structural properties of these films have been studied by the measurement of their XRD, SEM, and AFM. The variation of Li{sup +} concentration influences the crystallinity and surface morphology of the CaTiO{sub 3}:Pr{sup 3+} thin films. As Li{sup +} content increases from 0 to 1 wt.%, the crystallinity and intensity of emission increases. The dominant emission is from {sup 1}D{sub 2} {yields} {sup 3}H{sub 4} transition at 613 nm. The {sup 1}D{sub 2} emission quenching has also been observed in highly doped sample and is related to the cross-relaxation process between Pr{sup 3+} ions.

Formation of La3+, Pr3+, Eu3+, Er3+, and Lu3+ complexes with chloride ions, in aqueous medium

International Nuclear Information System (INIS)

Fernandez R, E.; Jimenez R, M.; Solache R, M.

2007-01-01

The constants of stability of the complexes of La 3+ , Pr 3+ , Eu 3+ , Er 3+ , and Lu 3+ with Cl - ions, its were determined, in the aqueous medium of HCI - HClO 4 and by a solvent extraction method. The dinonyl naphtalene sulfonic acid in n-heptane was used as extractant. The lanthanides concentration, it was measured by a VIS spectrophotometry method and by another radiochemical. The ions specific interaction theory (SIT) it was used for the extrapolation to ionic force 0 M. The results indicate that the stability constants of the LnCI 2+ species diminishes when increasing the ion force and the charge density. (Author)

Impact of larger rare earth Pr{sup 3+} ions on the physical properties of chemically derived Pr{sub x}CoFe{sub 2−x}O{sub 4} nanoparticles

Energy Technology Data Exchange (ETDEWEB)

Pachpinde, A.M.; Langade, M.M. [Department of Chemistry, Jawahar Art Science and Commerce College Andur, Osmanabad, MS (India); Lohar, K.S.; Patange, S.M. [Materials Research Laboratory, Srikrishna Mahavidyalaya Gunjoti, Omerga, Osmanabad 413 613, MS (India); Shirsath, Sagar E., E-mail: shirsathsagar@hotmail.com [Spin Device Technology Center, Department of Information Engineering, Shinshu University, Nagano 380 8553 (Japan)

2014-01-31

Highlights: • Rare earth Pr{sup 3+} substituted CoFe{sub 2}O{sub 4}. • Sol–gel auto combustion synthesis. • XRD and IR spectra reveal the spinel structure. • Magnetization and coercivity increased with Pr{sup 3+} substitution. - Abstract: Rare earth Pr{sup 3+} ions with its larger ionic radii substituted CoFe{sub 2}O{sub 4} nanoparticles with x ranging from 0.0 to 0.1 were synthesized by sol–gel auto-combustion chemical method. Powder X-ray diffraction (XRD), scanning electron microscopy (SEM), infrared spectroscopy (IR) and vibrating sample magnetometer (VSM) were employed to characterize the physical properties of these ferrite nanoparticles. XRD pattern reveals the formation of cubic spinel ferrite with the signature of PrFeO{sub 3} phases for x ⩾ 0.05. SEM images show that the synthesized samples are in good homogeneity with uniformly distributed grain. The results of IR spectroscopy analysis indicated that the functional groups of cobalt spinel ferrite were formed during the sol–gel process. The cations distribution between the tetrahedral (A-site) and octahedral sites (B-site) has been estimated by XRD analysis. Room temperature magnetic measurement shows saturation magnetization and coercivity increased from 54.7 to 64.2 emu/g and 644 to 1013 Oe, respectively with the increasing Pr{sup 3+} substitution.

Thermodynamic assessment of the Pr-Zn binary system

International Nuclear Information System (INIS)

Huang, X.M.; Liu, L.B.; Zhang, L.G.; Jia, B.R.; Jin, Z.P.; Zheng, F.

2008-01-01

On the basis of available experimental data of phase diagram and thermodynamic properties, the Pr-Zn binary system has been optimized using the CALPHAD approach. The phases, including liquid and bcc A 2(βPr) were treated as substitutional solutions, while the intermetallic compounds, including PrZn, PrZn 2 , PrZn 3 , Pr 3 Zn 11 , Pr 13 Zn 58 , Pr 3 Zn 22 , Pr 2 Zn 17 and PrZn 11 were modeled as stoichiometric compounds. As the result of optimization, a set of self-consistent thermodynamic parameters has been obtained, which can be used to reproduce the reported experimental data

Magnetotransport and magnetism in single-crystal PrBa2Cu3O7-δ

International Nuclear Information System (INIS)

Browning, V.M.; Osofsky, M.S.; Byers, J.M.; Ehrlich, A.C.; Dosseul, F.

1996-01-01

The PrBa 2 Cu 3 O 7-δ (Pr 123) system is known to exhibit antiferromagnetic ordering of the Cu spins in the Cu-O planes and chains, in addition to the observed antiferromagnetism due to the ordering of the Pr ions. The antiferromagnetism of the Cu-O planes is generally associated with the insulating nature of transport in Pr 123 and electrical conduction is believed to result through open-quote open-quote hopping close-quote close-quote transport between disordered Cu-O chain segments. However, the possible effects of magnetic ordering in the Cu-O chains on transport properties have not been discussed. If the Cu-O chains play a dominant role in the electrical transport (as suggested by many of the popular theories), then the magnetic ordering of the chains should also be seen in the transport properties. We present magnetization and magnetotransport measurements on single crystal Pr 123 samples which suggest that the magnetism associated with the Cu-O chains does indeed mediate transport in this system. These results confirm that the chains play a significant role in the transport properties and underscore the need for further study of the interplay between magnetism and transport in Pr 123

PR-PR: cross-platform laboratory automation system.

Science.gov (United States)

Linshiz, Gregory; Stawski, Nina; Goyal, Garima; Bi, Changhao; Poust, Sean; Sharma, Monica; Mutalik, Vivek; Keasling, Jay D; Hillson, Nathan J

2014-08-15

To enable protocol standardization, sharing, and efficient implementation across laboratory automation platforms, we have further developed the PR-PR open-source high-level biology-friendly robot programming language as a cross-platform laboratory automation system. Beyond liquid-handling robotics, PR-PR now supports microfluidic and microscopy platforms, as well as protocol translation into human languages, such as English. While the same set of basic PR-PR commands and features are available for each supported platform, the underlying optimization and translation modules vary from platform to platform. Here, we describe these further developments to PR-PR, and demonstrate the experimental implementation and validation of PR-PR protocols for combinatorial modified Golden Gate DNA assembly across liquid-handling robotic, microfluidic, and manual platforms. To further test PR-PR cross-platform performance, we then implement and assess PR-PR protocols for Kunkel DNA mutagenesis and hierarchical Gibson DNA assembly for microfluidic and manual platforms.

Magnetic properties of Pr ions in perovskite-type oxides

International Nuclear Information System (INIS)

Sekizawa, K.; Kitagawa, M.; Takano, Y.

1998-01-01

Magnetic properties of Pr ions with the controlled valence on the A and B sites of perovskite-type oxides (ABO 3 ) were investigated for two systems. PrSc 1-x Mg x O 3 and BaPr 1-x Bi x O 3 . From the magnetic susceptibility χ versus temperature T curves of PrSc 1-x Mg x O 3 , the χ-T curve for molar Pr 3+ ions on the A site and that of Pr 4+ ions were obtained. The 1/χ-T curves for both ions exhibit the crystalline electric field (CEF) effect and the effective magneticmoment μ eff above 100 K is 3.41 μ B for Pr 3- and 2.58 μ B for Pr 4+ , respectively. The χ-T curve of PrSc 0.8 Mg 0.2 O 3 is similar to that of PrBa 2 Cu 3 O y . In the BaPr 1-x Bi x O 3 system, only one intermediate phase BaPr 0.5 Bi 0.5 O 3 exists, in which Pr and Bi take an ordered arrangement on the B site. The magnetic susceptibility χ for Pr 4+ and that of Pr 3+ in the ordered arrangement with Bi 5- on the B site are much smaller than those for the A site, reflecting the strong CEF effect on the B site. Experimental χ-T curves can be well reproducedby the numerical calculation for Pr 3+ or Pr 4+ ions in the molecular field and the CEF with proper respective parameters. (orig.)

Spectroscopic study of Pr3+ ions doped Zinc Lead Tungsten Tellurite glasses for visible photonic device applications

Science.gov (United States)

Sharma, Ritu; Rao, A. S.; Deopa, Nisha; Venkateswarlu, M.; Jayasimhadri, M.; Haranath, D.; Prakash, G. Vijaya

2018-04-01

Zinc Lead Tungsten Tellurite (ZnPbWTe) glasses doped with different Pr3+ ion concentrations having the composition 5ZnO + 15PbO + 20WO3 + (60-x)TeO2 + xPr6O11 (where x = 0.5, 1, 1.5, 2.0 and 2.5 mol%) were prepared by using sudden quenching technique and characterized to understand their visible emission characteristic features using spectroscopic techniques such as absorption, excitation and emission. The Judd-Ofelt (J-O) theory has been applied to the absorption spectral features with an aim to evaluate various radiative properties for the prominent fluorescent levels of Pr3+ions in the as-prepared glasses. The emission spectra recorded for the as-prepared glasses under 468 nm excitation show three prominent emission transitions 3P0→3H6, 3P0→3F2 and 3P1→3F4, of which 3P0→3F2 observed in visible red region (648 nm), is relatively more intense. The intensity of 3P0→3F2 emission transition in the titled glasses increases up to 1mol% of Pr3+ ions and beyond concentration quenching is observed. Branching ratios (βR) and emission cross-sections (σse) were estimated for 3P0→3F2 transition to understand the luminescence efficiency in visible red region (648 nm). The CIE chromaticity coordinates were also evaluated in order to understand the suitability of these glasses for visible red luminescence devices. From the emission cross-sections, quantum efficiency and CIE coordinates, it was concluded that 1mol% of Pr3+ ions in ZnPbWTe glasses are quite suitable for preparing visible reddish orange luminescent devices.

77 FR 23244 - Atmos Energy Colorado/Kansas Division; Notice of Revised Baseline Filing

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2012-04-18

... DEPARTMENT OF ENERGY Federal Energy Regulatory Commission [Docket No. PR12-22-000] Atmos Energy Colorado/Kansas Division; Notice of Revised Baseline Filing Take notice that on April 10, 2012, Atmos Energy Colorado/Kansas Division (Atmos) filed a revised baseline filing of their Statement of Operating...

76 FR 2361 - Atmos Energy-Kentucky/Mid-States Division; Notice of Baseline Filing

Science.gov (United States)

2011-01-13

... DEPARTMENT OF ENERGY Federal Energy Regulatory Commission [Docket No. PR11-77-000] Atmos Energy--Kentucky/Mid-States Division; Notice of Baseline Filing January 5, 2011. Take notice that on December 30, 2010, Atmos Energy--Kentucky/Mid- States Division submitted a revised baseline filing of their...

Phase diagrams of Pr-C system

International Nuclear Information System (INIS)

Eremenko, V.N.; Velikanova, T.Ya.; Gordijchuk, O.V.

1988-01-01

Results of the X-ray phase, metallographic and high-temperature differential thermal analysis are used for the first time to plot a diagram of the Pr-C system state. Carbides are formed in the system: Pr 2 C 3 with the bcc-structure of the Pu 2 C 3 type and with the period a 0 = 0.85722+-0.00026 within the phase region + 2 C 3 >, a 0 0.86078+-0.00016 nm - within the region 2 C 3 >+α-PrC 2 ; dimorphous PrC 2 : α-PrC 2 with the bct-structure of the CaC 2 type and periods a 0.38517+-0.00011, c 0 = 0.64337+-0.00019 nm; β-PrC 2 with the fcc-structure, probably, of KCN type. Dicarbide melts congruently at 2320 grad. C, forming eutectics with graphite at 2254+-6 grad. C and composition of 71.5% (at.)C. It is polymorphously transformed in the phase region 2 C 3 > + 2 > at 1145+-4 grad. C, and in the region 2 >+C at 1134+-4 grad. C. Sesquicarbide melts incongruently at 1545+-4 grad. C. The eutectic reaction L ↔ + 2 C 3 > occurs at 800+-4 grad. C, the eutectic composition ∼ 15% (at.)C. The temperature of the eutectoid reaction ↔ + 2 C 3 > is 675+-6 grad C. The limiting carbon solubility in β-Pr is about 8 and in α-Pr it is about 5% (at.)

Magnetic properties of cyano-bridged Ln3+-M3+ complexes. Part I: trinuclear complexes (Ln3+ = La, Ce, Pr, Nd, Sm; M3+ = FeLS, Co) with bpy as blocking ligand.

Science.gov (United States)

Figuerola, Albert; Ribas, Joan; Llunell, Miquel; 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 eight trinuclear complexes: trans-[M(CN)4(mu-CN)2{Ln(H2O)4(bpy)2}2][M(CN)6].8H2O (M = Fe3+ or Co3+, Ln = La3+, Ce3+, Pr3+, Nd3+, and Sm3+). The structures for the eight complexes [La2Fe] (1), [Ce2Fe] (2), [Pr2Fe] (3), [Nd2Fe] (4), [Ce2Co] (5), [Pr2Co] (6), [Nd2Co] (7), and [Sm2Co] (8) have been solved; they crystallize in the triclinic space group P and are isomorphous. They exhibit a supramolecular 3D architecture through hydrogen bonding and pi-pi stacking interactions. A stereochemical study of the nine-vertex polyhedra of the lanthanide ions, based on continuous shape measures, is presented. No significant magnetic interaction was found between the lanthanide(III) and the iron(III) ions.

75 FR 74706 - Notice of Baseline Filings

Science.gov (United States)

2010-12-01

... DEPARTMENT OF ENERGY Federal Energy Regulatory Commission Notice of Baseline Filings November 24, 2010. Centana Intrastate Pipeline, LLC. Docket No. PR10-84-001. Centana Intrastate Pipeline, LLC... applicants listed above submitted a revised baseline filing of their Statement of Operating Conditions for...

Perilipin 3 modulates specific lipogenic pathways in SZ95 sebocytes.

Science.gov (United States)

Camera, Emanuela; Dahlhoff, Maik; Ludovici, Matteo; Zouboulis, Christos C; Schneider, Marlon R

2014-10-01

Lipid droplets (LD) are dynamic organelles that manage cellular lipid synthesis, storage and retrieval. Although LD-associated proteins, including the perilipin family (PLIN1-PLIN5), are essential for these functions, they have been poorly characterized in sebocytes. Here, we employed siRNAs to downregulate PLIN3 in SZ95 sebaceous gland cells and evaluated the consequences in lipid accumulation by nile red staining and mass spectrometry. Nile red staining revealed that siRNA-mediated downregulation of PLIN3 significantly impaired linoleic acid-induced lipid accumulation in SZ95 sebocytes. Mass spectrometry revealed that PLIN3 was implicated in the metabolism of linoleic acid, a lipid source used in the build-up of triglycerides, among other acyl lipids. Furthermore, the expression of key enzymes of sebaceous lipogenesis was altered in PLIN3-deficient sebocytes, consistent with the changes observed in the neutral lipid abundance, suggesting that PLIN3 functions are intertwined with the lipogenic pathways implicated in sebaceous lipogenesis, such as desaturation and triglyceride synthesis. © 2014 John Wiley & Sons A/S. Published by John Wiley & Sons Ltd.

75 FR 68607 - CenterPoint Energy-Illinois Gas Transmission Company; Notice of Baseline Filing

Science.gov (United States)

2010-11-08

... DEPARTMENT OF ENERGY Federal Energy Regulatory Commission [Docket No. PR10-80-001] CenterPoint Energy--Illinois Gas Transmission Company; Notice of Baseline Filing November 1, 2010. Take notice that on October 28, 2010, CenterPoint Energy--Illinois Gas Transmission Company submitted a revised...

78 FR 20314 - Jefferson Island Storage & Hub, L.L.C.; Notice of Filing

Science.gov (United States)

2013-04-04

... DEPARTMENT OF ENERGY Federal Energy Regulatory Commission [Docket No. PR13-44-000] Jefferson Island Storage & Hub, L.L.C.; Notice of Filing Take notice that on March 28, 2013, Jefferson Island Storage & Hub, L.L.C. filed to revise its Statement of Operating Conditions to among others, update...

76 FR 20657 - Hattiesburg Industrial Gas Sales, L.L.C.; Notice of Filing

Science.gov (United States)

2011-04-13

... DEPARTMENT OF ENERGY Federal Energy Regulatory Commission [Docket No. PR10-102-001] Hattiesburg Industrial Gas Sales, L.L.C.; Notice of Filing Take notice that on April 1, 2011, Hattiesburg Industrial Gas Sales, L.L.C. (Hattiesburg) filed a revised Statement of Operating Conditions to comply with a...

78 FR 21929 - Hattiesburg Industrial Gas Sales, L.L.C.; Notice of Filing

Science.gov (United States)

2013-04-12

... DEPARTMENT OF ENERGY Federal Energy Regulatory Commission [Docket No. PR13-46-000] Hattiesburg Industrial Gas Sales, L.L.C.; Notice of Filing Take notice that on April 1, 2013, Hattiesburg Industrial Gas Sales, L.L.C. (Hattiesburg) filed to cancel its Statement of Operating Conditions including its Tariff...

77 FR 63311 - Acacia Natural Gas Corporation; Notice of Petition for Rate Approval

Science.gov (United States)

2012-10-16

... DEPARTMENT OF ENERGY Federal Energy Regulatory Commission [Docket No. PR13-1-000] Acacia Natural Gas Corporation; Notice of Petition for Rate Approval Take notice that on October 9, 2012, Acacia Natural Gas Corporation (Acacia) filed a Petition for Rate Approval pursuant to 284.123(b)(2) of the...

Mid-infrared emissions of Pr{sup 3+}-doped GeS{sub 2}–Ga{sub 2}S{sub 3}–CdI{sub 2} chalcohalide glasses

Energy Technology Data Exchange (ETDEWEB)

Lu, Chunfeng [State Key Laboratory of Transient Optics and Photonics, Xi’an Institute of Optics and precision Mechanics, Chinese Academy of Science (CAS), Xi’an, Shaanxi 710119 (China); Guo, Haitao, E-mail: guoht_001@opt.ac.cn [State Key Laboratory of Transient Optics and Photonics, Xi’an Institute of Optics and precision Mechanics, Chinese Academy of Science (CAS), Xi’an, Shaanxi 710119 (China); Xu, Yantao; Hou, Chaoqi; Lu, Min [State Key Laboratory of Transient Optics and Photonics, Xi’an Institute of Optics and precision Mechanics, Chinese Academy of Science (CAS), Xi’an, Shaanxi 710119 (China); He, Xin [School of Applied Physics and Materials, Wuyi University, Jiangmen, Guangdong 529020 (China); Wang, Pengfei; Li, Weinan [State Key Laboratory of Transient Optics and Photonics, Xi’an Institute of Optics and precision Mechanics, Chinese Academy of Science (CAS), Xi’an, Shaanxi 710119 (China); Peng, Bo, E-mail: bpeng@opt.ac.cn [State Key Laboratory of Transient Optics and Photonics, Xi’an Institute of Optics and precision Mechanics, Chinese Academy of Science (CAS), Xi’an, Shaanxi 710119 (China)

2014-12-15

Graphical abstract: ∼4.6 μm mid-infrared fluorescence emission from Pr{sup 3+} in the sulfide glass is successfully observed at room temperature excited by a 2.01 μm Tm{sup 3+}:YAG ceramic laser system. - Highlights: • Serial Pr{sup 3+}-doped GeS{sub 2}–Ga{sub 2}S{sub 3}–CdI{sub 2} chalcohalide glasses were synthesized. • ∼4.6 μm mid-infrared fluorescence from Pr{sup 3+} was observed at room temperature. • The compositional dependence of luminescence properties was studied. • Radiative properties have been determined using the Judd–Ofelt theory. - Abstract: For elucidation of the glass composition’s influence on the spectroscopic properties in the chalcohalide system and the discovery of a new material for applications in mid-infrared fiber-lasers, a serial Pr{sup 3+}-doped (100 − x)(0.8GeS{sub 2}·0.2Ga{sub 2}S{sub 3})xCdI{sub 2} (x = 5, 10, 15 and 20) chalcohalide glasses were prepared. ∼4.6 μm mid-infrared fluorescence emission from Pr{sup 3+} in the sulfide glass is successfully observed at room temperature excited by a 2.01 μm Tm{sup 3+}:YAG ceramic laser system, and the effective line-width of fluorescence band is 106–227 nm. Intense compositional dependence of mid-infrared emissions is found. The radiative rates of Pr{sup 3+} ions in these glasses were calculated by using the Judd–Ofelt theory.

Manual de la práctica 3 de laboratorio 2010 (revisado)

OpenAIRE

Candelas Herías, Francisco Andrés; Puente Méndez, Santiago Timoteo

2010-01-01

Esta versión del manual ha sido actualizada y revisada, y tiene varios errores corregidos. Manual de la práctica 3 de laboratorio sobre gestión de la Calidad de Servicio con routers Cisco y análisis de redes IEEE 802.11, para el curso 2009-10.

Dual-enhancement of ferro-/piezoelectric and photoluminescent performance in Pr{sup 3+} doped (K{sub 0.5}Na{sub 0.5})NbO{sub 3} lead-free ceramics

Energy Technology Data Exchange (ETDEWEB)

Wei, Yongbin; Jia, Yanmin, E-mail: wuzheng@zjnu.cn, E-mail: ymjia@zjnu.edu.cn; Wu, Jiang; Shen, Yichao [Department of Physics, Zhejiang Normal University, Jinhua 321004 (China); Wu, Zheng, E-mail: wuzheng@zjnu.cn, E-mail: ymjia@zjnu.edu.cn [College of Geography and Environmental Sciences, Zhejiang Normal University, Jinhua 321004 (China); Luo, Haosu [Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 201800 (China)

2014-07-28

A mutual enhancement action between the ferro-/piezoelectric polarization and the photoluminescent performance of rare earth Pr{sup 3+} doped (K{sub 0.5}Na{sub 0.5})NbO{sub 3} (KNN) lead-free ceramics is reported. After Pr{sup 3+} doping, the KNN ceramics exhibit the maximum enhancement of ∼1.2 times in the ferroelectric remanent polarization strength and ∼1.25 times in the piezoelectric coefficient d{sub 33}, respectively. Furthermore, after undergoing a ferro-/piezoelectric polarization treatment, the maximum enhancement of ∼1.3 times in photoluminescence (PL) was observed in the poled 0.3% Pr{sup 3+} doped sample. After the trivalent Pr{sup 3+} unequivalently substituting the univalent (K{sub 0.5}Na{sub 0.5}){sup +}, A-sites ionic vacancies will occur to maintain charge neutrality, which may reduce the inner stress and ease the domain wall motions, yielding to the enhancement in ferro-/piezoelectric performance. The polarization-induced enhancement in PL is attributed to the decrease of crystal symmetry abound the Pr{sup 3+} ions after polarization. The dual-enhancement of the ferro-/piezoelectric and photoluminescent performance makes the Pr{sup 3+} doped KNN ceramic hopeful for piezoelectric/luminescent multifunctional devices.

Pr{sub 3}S{sub 2}Cl{sub 2}[AsS{sub 3}]: a praseodymium(III) sulfide chloride thioarsenate(III) with double chains of condensed [SPr{sub 4}]{sup 10+} tetrahedra

Energy Technology Data Exchange (ETDEWEB)

Kang, Dong-Hee [Institute for Inorganic Chemistry, University of Stuttgart (Germany); Department of Chemistry, University of Waterloo, ON (Canada); Korea Research Institute of Standards and Science (KRISS), Daejeon (Korea, Republic of); Ledderboge, Florian; Schleid, Thomas [Institute for Inorganic Chemistry, University of Stuttgart (Germany); Kleinke, Holger [Department of Chemistry, University of Waterloo, ON (Canada)

2015-02-15

Single crystals of Pr{sub 3}S{sub 2}Cl{sub 2}[AsS{sub 3}] were obtained by reacting praseodymium sesquisulfide and trichloride with arsenic and sulfur (molar ratio: 7:4:6:9) in torch-sealed evacuated silica ampoules at 850 C for a week and subsequent slow cooling to room temperature. The transparent, pale yellowish green platelets crystallize monoclinically (Pr{sub 3}S{sub 2}Cl{sub 2}[AsS{sub 3}]: a = 2190.96(9) pm, b = 685.49(3) pm, c = 701.87(3) pm, β = 98.752(3) ) in the non-centrosymmetric space group Cc with Z = 4. The crystal structure of Pr{sub 3}S{sub 2}Cl{sub 2}[AsS{sub 3}] comprises three crystallographically different Pr{sup 3+} cations. (Pr1){sup 3+} and (Pr2){sup 3+} exhibit bicapped trigonal prismatic environments of five sulfur and three chlorine atoms (C.N. = 8) each, whereas only seven sulfur atoms arranged as capped trigonal prism (C.N. = 7) are present in the case of (Pr3){sup 3+}. Two of the five crystallographically different sulfur atoms (S1 and S2) are coordinated by four Pr{sup 3+} cations, each in the shape of slightly distorted [SPr{sub 4}]{sup 10+} tetrahedra (d(S-Pr) = 278-294 pm). Hence, the crystal structure of Pr{sub 3}S{sub 2}Cl{sub 2}[AsS{sub 3}] contains double chains with the composition {sup 1}{sub ∞}{[S_2Pr_3]"5"+}, consisting of two parallel edge-fused chains of anti-SiS{sub 2}-analogous single strands {sup 1}{sub ∞}{[SPr_2]"4"+}, formed by trans-edge sharing [SPr{sub 4}]{sup 10+} tetrahedra. The arrangement of the {sup 1}{sub ∞}{[S_2Pr_3]"5"+} double chains running along [001] can be described as a hexagonal rod-packing. Chloride anions (Cl1 and Cl2) as well as the isolated, ψ{sup 1}-tetrahedral thioarsenate(III) groups [AsS{sub 3}]{sup 3-} (d(As-S) = 228-229 pm) consisting of three sulfur atoms (S3, S4, and S5) and an As{sup 3+} cation carrying a stereochemically active non-bonding electron pair take care of the three-dimensional interconnection and the charge balance of the {sup 1}{sub ∞}{[S_2Pr_3]"5"+} double

A potential method using Ge{iPrNC[N(SiMe_3)_2]NiPr}{sub 2}, (Et{sub 3}Si){sub 2}Te and anhydrous hydrazine for germanium tellurides

Energy Technology Data Exchange (ETDEWEB)

Du, Liyong; Du, Shulei; Ding, Yuqiang [School of Chemical and Material Engineering, Jiangnan University, Wuxi (China)

2017-12-29

A germanium(II)-guanidine derivative of formula Ge{iPrNC[N(SiMe_3)_2]NiPr}{sub 2} (1) was synthesized and characterized by {sup 1}H NMR, {sup 13}C NMR, elemental analysis, and X-ray diffraction method. Thermal property was also studied to identify its thermal stability and volatility. More importantly, compound 1 was synthesized to develop a new method for germanium tellurides, where anhydrous hydrazine was introduced to prompt the activity of germanium(II) guanidines (or derivatives) towards (Et{sub 3}Si){sub 2}Te. Solution reaction of compound 1, (Et{sub 3}Si){sub 2}Te, and anhydrous hydrazine was investigated to pre-identify the feasibility of this combination for ALD process. The EDS data of the black precipitate from this reaction verified the potential of this method to manufacture germanium tellurides. (copyright 2017 WILEY-VCH Verlag GmbH and Co. KGaA, Weinheim)

75 FR 26746 - ONEOK Westex Transmission, L.L.C.; Notice of Baseline Filing

Science.gov (United States)

2010-05-12

... DEPARTMENT OF ENERGY Federal Energy Regulatory Commission [Docket No. PR10-19-000] ONEOK Westex Transmission, L.L.C.; Notice of Baseline Filing May 5, 2010. Take notice that on April 29, 2010, ONEOK Westex Transmission, L.L.C. submitted its baseline filing of its Statement of Operating Conditions for transportation...

75 FR 51990 - CenterPoint Energy-Illinois Gas Transmission Company; Notice of Baseline Filing

Science.gov (United States)

2010-08-24

... DEPARTMENT OF ENERGY Federal Energy Regulatory Commission [Docket No. PR10-80-000] CenterPoint Energy--Illinois Gas Transmission Company; Notice of Baseline Filing August 17, 2010. Take notice that on August 12, 2010, the applicant listed above submitted their baseline filing of its Statement of Operating...

Relaxation of the electronic states at a thin-layer YBa2Cu 3O7/PrBa2Cu3O7 interface

KAUST Repository

Gó mez, Javier Alexandra M; Larkin, Ivan A.; Schwingenschlö gl, Udo

2010-01-01

We discuss in detail spin-polarized electronic structure calculations for the 1 × 1 YBa2Cu3O7/PrBa 2Cu3O7 superlattice. Our results are based on the full-potential linear augmented plane wave method and the generalized gradient approximation for the exchange-correlation functional. The on-site Coulomb interaction affecting the correlated Cu 3d and Pr 4f electrons is taken into consideration. At first glance the YBa2Cu3O 7/PrBa2Cu3O7 interface appears to be inert, i.e., the electronic states do not show a clear sign of interaction between the two component materials. Nonetheless, a total energy analysis points to a significant modification of the magnetic coupling in the vicinity of the interface due to the relaxation of the electronic structure. © 2010 Elsevier B.V. All rights reserved.

Relaxation of the electronic states at a thin-layer YBa2Cu 3O7/PrBa2Cu3O7 interface

KAUST Repository

Gómez, Javier Alexandra M

2010-11-01

We discuss in detail spin-polarized electronic structure calculations for the 1 × 1 YBa2Cu3O7/PrBa 2Cu3O7 superlattice. Our results are based on the full-potential linear augmented plane wave method and the generalized gradient approximation for the exchange-correlation functional. The on-site Coulomb interaction affecting the correlated Cu 3d and Pr 4f electrons is taken into consideration. At first glance the YBa2Cu3O 7/PrBa2Cu3O7 interface appears to be inert, i.e., the electronic states do not show a clear sign of interaction between the two component materials. Nonetheless, a total energy analysis points to a significant modification of the magnetic coupling in the vicinity of the interface due to the relaxation of the electronic structure. © 2010 Elsevier B.V. All rights reserved.

Conventional and inverse magnetocaloric effect in Pr2CuSi3 and Gd2CuSi3 compounds

International Nuclear Information System (INIS)

Wang, Fang; Yuan, Feng-ying; Wang, Jin-zhi; Feng, Tang-fu; Hu, Guo-qi

2014-01-01

Highlights: • Two phase transitions in a narrow temperature range were observed and studied. • Both typical and inverse magnetocaloric effect were observed and discussed. • The inverse magnetocaloric effect was attributed to the spin-glass behavior. - Abstract: Magnetic properties and magnetocaloric effect (MCE) in Pr 2 CuSi 3 and Gd 2 CuSi 3 compounds were investigated systematically. Both Pr 2 CuSi 3 and Gd 2 CuSi 3 compounds experienced two phase transitions in a relatively narrow temperature range: first a paramagnet (PM)–ferromagnet (FM) second-order phase transition at 12 and 26 K and then a FM–spin glass (SG) transition at 6 K and 7.5 K, respectively. The magnetic entropy change (ΔS M ) was calculated based on Maxwell relation using the collected magnetization data. The maximum of ΔS M for Pr 2 CuSi 3 and Gd 2 CuSi 3 compounds was 7.6 and 5 J kg −1 K −1 , respectively, at the applied filed change of 0–5 T. The shape of the temperature dependence of ΔS M (ΔS M –T) curve was obviously different from that of the conventional magnetic materials undergoing only one typical phase transition. In the left half part of ΔS M –T curve, ΔS M is not very sensitive to the applied field and they tend to intersect with the decrease of temperature. Both typical conventional and inverse MCE behavior were observed in Gd 2 CuSi 3 , which would be originated from the two transition features at the low temperatures

A cor da dor: iniquidades raciais na atenção pré-natal e ao parto no Brasil

Directory of Open Access Journals (Sweden)

Maria do Carmo Leal

Full Text Available Poucas pesquisas com foco nas influências da raça/cor no tocante à experiência de gestação e parto foram conduzidas no Brasil, sendo inédita a análise de abrangência nacional. Este estudo teve como objetivo avaliar as iniquidades na atenção pré-natal e parto de acordo com a raça/cor utilizando o método de pareamento baseado nos escores de propensão. Os dados são oriundos da pesquisa Nascer no Brasil: Pesquisa Nacional sobre Parto e Nascimento, um estudo de base populacional de abrangência nacional com entrevista e avaliação de prontuários de 23.894 mulheres em 2011/2012. Regressões logísticas simples foram utilizadas para estimar as razões de chance (OR e respectivos intervalos de 95% de confiança (IC95% da raça/cor associada aos desfechos analisados. Em comparação às brancas, puérperas de cor preta possuíram maior risco de terem um pré-natal inadequado (OR = 1,6; IC95%: 1,4-1,9, falta de vinculação à maternidade (OR = 1,2; IC95%: 1,1-1,4, ausência de acompanhante (OR = 1,7; IC95%: 1,4-2,0, peregrinação para o parto (OR = 1,3; IC95%: 1,2-1,5 e menos anestesia local para episiotomia (OR = 1,5 (IC95%: 1,1-2,1. Puérperas de cor parda também tiveram maior risco de terem um pré-natal inadequado (OR = 1,2; IC95%: 1,1-1,4 e ausência de acompanhante (OR = 1,4; IC95%: 1,3-1,6 quando comparadas às brancas. Foram identificadas disparidades raciais no processo de atenção à gestação e ao parto evidenciando um gradiente de pior para melhor cuidado entre mulheres pretas, pardas e brancas.

Modelling the optical bleaching of the thermoluminescence of K2YF5:Pr3+

International Nuclear Information System (INIS)

Marcazzó, J.; Santiago, M.; Khaidukov, N.; Caselli, E.

2012-01-01

Optical bleaching of the thermoluminescence (TL) curve of K 2 YF 5 :Pr 3+ has been observed after optically stimulated luminescence (OSL) readout of pre-irradiated crystals. The traps being responsible for the TL signal are not emptied completely by the optical stimulation. Furthermore, if the illumination time is increased a constant intensity level of the residual TL glow curve is eventually achieved. On the other hand, if the low temperature peak of the glow curve is thermally cleaned, no subsequent OSL is measured. This behavior has been successfully explained by assuming that part of the electrons in the trap being responsible for the low temperature glow peak of K 2 YF 5 :Pr 3+ recombine with holes via localized transitions during optical stimulation. During TL all trapped electrons recombine via delocalized transitions. Simulations have been carried out in order to demonstrate the feasibility of the model. - Highlights: ► The optical bleaching of the thermoluminescence of K2YF5:Pr 3+ has been studied. ► A model accounting for the optical bleaching has been put forward. ► Thermoluminescence occurs via delocalized transitions. ► Localized transitions occur during optical stimulation.

Controllable synthesis and tunable luminescence of glass ceramic containing Mn2+:ZnAl2O4 and Pr3+:YF3 nano-crystals

International Nuclear Information System (INIS)

Yu, Yunlong; Li, Xiaoyan

2016-01-01

Highlights: • Glass ceramic containing ZnAl 2 O 4 and YF 3 nano-crystals is fabricated. • Mn 2+ and Pr 3+ are selectively incorporated into ZnAl 2 O 4 and YF 3 , respectively. • The luminescence color can be tuned by adjusting the excitation wavelength. - Abstract: Glass ceramic containing spinel ZnAl 2 O 4 :Mn 2+ and orthorhombic YF 3 :Pr 3+ nano-crystals has been successfully prepared by a melt-quenching technique. X-ray diffraction and transmission electron microscopy demonstrated that two nano-phases, i.e. ZnAl 2 O 4 and YF 3 , were homogeneously distributed among the glass matrix. Importantly, the selective incorporation of Pr 3+ ions into the Y 3+ nine-fold coordinated sites of YF 3 and the segregation of Mn 2+ dopants in the Zn 2+ tetrahedral sites of ZnAl 2 O 4 were confirmed based on the excitation/emission spectra and the crystal field calculation. Under blue light excitation, both Pr 3+ and Mn 2+ in the glass ceramic can be simultaneously excited, and emit red and green luminescence, respectively, owing to the suppression of energy transfer between them. The luminescence color of the obtained glass ceramic can be easily tuned by adjusting the excitation wavelength. These results indicate the potential application of the glass ceramic as converting phosphor to generate white-light after coupling with the blue LED chip.

Study of absorption, emission and EDS properties of Pr3+ incorporated in a SiO2 matrix by sol-gel method

International Nuclear Information System (INIS)

Gómez-Miranda, M; Fonseca, R Sosa; Ordoñez, C Velásquez

2015-01-01

The optical response of the Pr 3+ ions doped monolith of SiO 2 prepared by sol-gel method was investigated by absorption and emission spectra. The absorption spectrum shows some typical lines of Pr 3+ , with these data was made the diagram levels corresponding to SiO 2 : Pr 3+ . The emission spectra were taken at 225 nm and 240 nm of wavelength of excitation was measured. In that there are reabsorption line at 423 of the Pr 3+ ions in the emission host, that means that some kind of host-ion interactions exist. Red and NIR emission at 612 nm, 652 nm, 711 and 728 nm, respectively, from Pr 3+ ions in SiO 2 was observed. The transition 1 S 0 → 3 P 2 at 425 nm is observed because an effective radiative transfer between the silicate glasses host and the praseodymium ions is observed and discussed

Electronic structures of PrBa{sub 2}Cu{sub 3}O{sub 7}, Pr{sub 2}Ba{sub 4}Cu{sub 7}O{sub 15-y}(y=0,1), and PrBa{sub 2}Cu{sub 4}O{sub 8} based on LSDA+U method

Energy Technology Data Exchange (ETDEWEB)

Tavana, A. [Magnet Research Laboratory (MRL), Department of Physics, Sharif University of Technology, Tehran (Iran); Department of Physics, University of Mohaghegh Ardabili, Ardabil (Iran); Shirazi, M.; Akhavan, M. [Magnet Research Laboratory (MRL), Department of Physics, Sharif University of Technology, Tehran (Iran)

2009-10-15

The electronic structures of PrBa{sub 2}Cu{sub 3}O{sub 7} (Pr123), Pr{sub 2}Ba{sub 4}Cu{sub 7}O{sub 15-y} (Pr247), and PrBa{sub 2}Cu{sub 4}O{sub 8} (Pr124) cuprates have been obtained using density-functional theory in the local spin density approximation plus onsite Coulomb interaction (LSDA+U). Onsite Hubbard correlation, U, has been considered for Pr-f and Cu-d orbitals and the effects of considering these correlation corrections on the Pr-O hybridizations have been inspected. Results imply that the Pr ionization state in Pr123 system is constituted from two different configurations, and the energy of the f states in these two configurations has an important role in superconductivity properties of the system. Our calculations also show that in both Pr124 and Pr247 systems, suppression of superconductivity is weaker than that in the Pr123 system. This occurs due to the weaker Pr-O bond in both Pr124 and Pr247 systems. The role of the double chain and single chain on the conduction properties of these compounds has been investigated. We have also studied the effect of oxygen deficiency in Pr247 system, which seems to revive superconductivity in this system. Investigating the hole carriers in the CuO{sub 2} plane shows a correlation between superconductivity suppression and hole decrement in the planes. (Abstract Copyright [2009], Wiley Periodicals, Inc.)

Characterization and thermal behavior of PrMO{sub 3} (M = Co or Ni) ceramic materials obtained from gelatin

Energy Technology Data Exchange (ETDEWEB)

Aquino, F.M., E-mail: flavyma@hotmail.com [Federal University of Rio Grande of Norte, Laboratory of Catalysis and Refining – NUPRAR, Av. Senador Salgado Filho, 3000, CEP 59078-970, Natal-RN (Brazil); Melo, D.M.A. [Federal University of Rio Grande of Norte, Laboratory of Catalysis and Refining – NUPRAR, Av. Senador Salgado Filho, 3000, CEP 59078-970, Natal-RN (Brazil); Pimentel, P.M. [Universidade Federal Rural do Semi-Árido, Campus Angicos, CEP 59515-000, Angicos-RN (Brazil); Braga, R.M.; Melo, M.A.F.; Martinelli, A.E.; Costa, A.F. [Federal University of Rio Grande of Norte, Laboratory of Catalysis and Refining – NUPRAR, Av. Senador Salgado Filho, 3000, CEP 59078-970, Natal-RN (Brazil)

2012-09-15

Graphical abstract: The micrograph in figure shows sample calcined at temperature 900 °C. The sample exhibits morphology with considerable porosity and the formation of agglomerated nanometric particles. Gelatin provides the system with a large amount of organic matter, which is then removed during calcinations, favoring the appearance of pores in the material. Highlights: ► Oxides with PrNiO{sub 3} and PrCoO{sub 3} were prepared by new method synthesis. ► The gelatin, through its carboxylate groups and amine, is an efficient director. ► The obtained materials have magnetic properties and application in catalysis. ► The decomposition kinetic study of bonding groups of gelatin with metallic ions that takes part in the synthesis of PrMO{sub 3}. -- Abstract: Metal oxides with perovskite-type structure have attracted considerable interest in recent years due to their magnetic and electrical properties, as well as their catalytic activity. In this study, oxides with PrNiO{sub 3} and PrCoO{sub 3} composition were prepared by using gelatin powder as a precursor agent for its use as a catalyst. The powders obtained were calcined at 700 °C and 900 °C and characterized using the X-ray diffraction, thermal analysis (thermogravimetry and differential thermal analysis), infrared spectroscopy, temperature programed reduction and scanning electron microscopy techniques. Thermogravimetric data using the non-isothermal kinetic models of Flynn and Wall and “Model-free Kinetics” were used to determine the activation energy to study the decomposition kinetics of the ligand groups with system's metallic ions that takes part in the synthesis of PrMO{sub 3} (M = Ni or Co).

Microwave properties of YBa2Cu3O7-δ/PrBa2Cu3O7-δ superlattices

International Nuclear Information System (INIS)

Carlos, W.E.; Kaplan, R.; Lowndes, D.H.; Norton, D.P.

1992-01-01

We have used non-resonant microwave absorption to study c-axis YBa 2 Cu 3 O 7-δ /PrBa 2 Cu 3 O 7-δ superlattices and compare the response to a film of similarly grown YBa 2 Cu 3 O 7-δ (YBCO). Near the respective transition temperatures, the response of the superlattice samples and the YBCO film have similar amplitudes and orientation dependences. This is consistent with the microwave loss being related to magnetic flux penetration at (110) slip planes. At lower temperatures, the response of the superlattices is much stronger than that of the YBCO film and, while both responses are hysteretic at low temperatures, the widths of the hysteresis have opposite orientation dependences, which we attribute to the role of the PrBa 2 Cu 3 O 7-δ layers. (orig.)

75 FR 41855 - Enogex L.L.C.; Notice of Petition for Rate Approval

Science.gov (United States)

2010-07-19

... DEPARTMENT OF ENERGY Federal Energy Regulatory Commission [Docket No. PR10-52-000] Enogex L.L.C.; Notice of Petition for Rate Approval July 13, 2010. Take notice that on July 1, 2010, Enogex L.L.C. (Enogex) filed pursuant to section 284.123(b)(2) of the Commission's regulations, filed a petition...

75 FR 63452 - ONEOK Gas Storage, L.L.C.; Notice of Baseline Filing

Science.gov (United States)

2010-10-15

... DEPARTMENT OF ENERGY Federal Energy Regulatory Commission [Docket No. PR11-67-001] ONEOK Gas Storage, L.L.C.; Notice of Baseline Filing October 7, 2010. Take notice that on October 1, 2010, ONEOK Gas Storage, L.L.C. submitted a revised baseline filing of its Statement of Operating Conditions for services...

Magnetization reversal and ferrimagnetism in Pr1–xNdxMnO3

Indian Academy of Sciences (India)

Administrator

magnetic moments of rare earth ions are polarized due to the coupling with the Mn ... being La3+ non-magnetic, reversal of magnetization in. La0∙5Gd0∙5CrO3 is due to .... D.C. magnetization M vs temperature in Pr1–x. NdxMnO3 (x = 0∙3, 0∙5 ...

78 FR 11639 - Houston Pipe Line Company LP; Notice of Petition for Rate Approval

Science.gov (United States)

2013-02-19

... DEPARTMENT OF ENERGY Federal Energy Regulatory Commission [Docket No. PR13-31-000] Houston Pipe Line Company LP; Notice of Petition for Rate Approval Take notice that on February 1, 2013, Houston Pipe Line Company LP (HPL) filed for approval of rates for transportation service pursuant to section...

Reactions of R(2)P-P(SiMe(3))Li with [(R'(3)P)(2)PtCl(2)]. A general and efficient entry to phosphanylphosphinidene complexes of platinum. Syntheses and structures of [(eta(2)-P=(i)Pr(2))Pt(p-Tol(3)P)(2)], [(eta(2)-P=(t)Bu(2))Pt(p-Tol(3)P)(2)], [{eta(2)-P=(N(i)Pr(2))(2)}Pt(p-Tol(3)P)(2)] and [{(Et(2)PhP)(2)Pt}(2)P(2)].

Science.gov (United States)

Domańska-Babul, Wioleta; Chojnacki, Jaroslaw; Matern, Eberhard; Pikies, Jerzy

2009-01-07

The reactions of lithium derivatives of diphosphanes R(2)P-P(SiMe(3))Li (R = (t)Bu, (i)Pr, Et(2)N and (i)Pr(2)N) with [(R'(3)P)(2)PtCl(2)] (R'(3)P = Et(3)P, Et(2)PhP, EtPh(2)P and p-Tol(3)P) proceed in a facile manner to afford side-on bonded phosphanylphosphinidene complexes of platinum [(eta(2)-P=R(2))Pt(PR'(3))(2)]. The related reactions of Ph(2)P-P(SiMe(3))Li with [(R'(3)P)(2)PtCl(2)] did not yield [(eta(2)-P=PPh(2))Pt(PR'(3))(2)] and resulted mainly in the formation of [{(R'(3)P)(2)Pt}(2)P(2)], Ph(2)P-PLi-PPh(2), (Me(3)Si)(2)PLi and (Me(3)Si)(3)P. Crystallographic data are reported for the compounds [(eta(2)-P=R(2))Pt(p-Tol(3)P)(2)] (R = (t)Bu, (i)Pr, ((i)Pr(2)N)(2)P) and for [{(Et(2)PhP)(2)Pt}(2)P(2)].

The Role of Social Relationships in PrEP Uptake and Use Among Transgender Women and Men Who Have Sex with Men.

Science.gov (United States)

Mehrotra, Megha L; Rivet Amico, K; McMahan, Vanessa; Glidden, David V; Defechereux, Patricia; Guanira, Juan V; Grant, Robert M

2018-05-12

Qualitative studies suggest that social relationships play an important role in HIV pre-exposure prophylaxis (PrEP) use, but there have been few quantitative assessments of the role of social relationships in PrEP uptake or adherence. We examined the association between disclosure of study participation or LGBT identity and PrEP use in the 1603 HIV-negative participants enrolled in the iPrEx OLE study. We also evaluated the association between LGBT social group involvement and PrEP use. Study participation disclosure to parents and LGBT identity disclosure to anyone in a participant's social network were associated with greater PrEP uptake. Study participation disclosure to partners was associated with higher probability of having protective PrEP drug concentrations compared [risk difference 0.15 95% CI (0.01, 0.30)]. For each additional type of LGBT organization a participant was involved in, the probability of PrEP uptake and having protective drug concentrations increased by 0.04 [95% CI (0.03, 0.06)] and 0.04 (95% CI (0.02, 0.07)] respectively. Overall, social context was associated with PrEP use in iPrEx OLE, and should be taken into consideration when designing future PrEP implementation programs.

Proceedings of the 3. International Symposium. Dubna. Deuteron-95

Energy Technology Data Exchange (ETDEWEB)

NONE

1996-07-01

Proceedings of the 3. International Symposium. Dubna. Deuteron-95 (July 4-7, 1995) are presented. The main subjects of 50 presented reports are the following ones: the deuteron structure at small distances in hadron-deuteron interactions with polarized and nonpolarized beams and targets; the deuterons structure in lD and {gamma}D interactions; study of the NN interactions; the program of experimental investigations of the deuteron structure at JINR and other centers; prospects of the investigations with polarized {sup 3}He beams.

30 CFR 90.3 - Part 90 option; notice of eligibility; exercise of option.

Science.gov (United States)

2010-07-01

... 30 Mineral Resources 1 2010-07-01 2010-07-01 false Part 90 option; notice of eligibility; exercise of option. 90.3 Section 90.3 Mineral Resources MINE SAFETY AND HEALTH ADMINISTRATION, DEPARTMENT OF... DEVELOPMENT OF PNEUMOCONIOSIS General § 90.3 Part 90 option; notice of eligibility; exercise of option. (a...

Detección de anticuerpos contra los antígenos de diferenciación tumoral proteinasa 3 (PR3 y mieloperoxidasa (MPO en la leucemia promielocítica Detection of antibodies to antigens of proteinase 3 (PR3 tumor differentiations and myeloperoxidase (MPO in cases of promyelocytic leukemia

Directory of Open Access Journals (Sweden)

Ada A. Arce Hernández

2010-08-01

Full Text Available La leucemia promielocítica (LPM subtipo M3 representa del 5-15 % en la clasificación FAB de las leucemias mieloides agudas (LMA. Está asociada con características genéticas únicas que incluyen la translocación recíproca t(15;17(q22;q12. El mecanismo por el que ocurre la t(15;17 no se conoce. Las leucemias de estirpe mieloide expresan diversos antígenos de diferenciación tumoral como son la proteinasa 3 (PR 3 y la mieloperoxidasa (MPO que se encuentran sobreexpresados en el promielocito. Se plantea que participan en la maduración y en la regulación de la división celular. Existe poca información acerca de la respuesta inmune de pacientes con LPM dirigida contra las células tumorales. En nuestro trabajo se detectó la presencia de anticuerpos contra los antígenos de diferenciación tumoral PR3 y MPO en diferentes fases del tratamiento de la enfermedad, mediante inmunofluorescencia indirecta. Los anticuerpos anti PR3 y anti MPO se detectaron en aquellos pacientes sin tratar y en fase de inducción, no así en la consolidación y mantenimiento, de ahí su posible utilidad como marcadores de diferenciación celular.ABSTRACT Promyelocytic leukemia (PML subtype M3 represents the 5-15 % in the FAB classification of acute myeloid leukemias (AML. It is associated with the unique genetic features including the reciprocal t-translocation (15;17 (q22;q12. The mechanism of t is unknown. The myeloid leukemias express different tumoral differentiation antigens such as the proteinase 3 (PR 3 and myeloperoxidase (MPO which are over-expressed in promyelocyte. It is involved in maturation and regulation of cell division. There is scarce information on the immune response of patients with PLM against tumor cells. In our paper we detected presence of antibodies to RP3 and MPO tumor differentiation antigens in different phases of disease treatment by indirect immunofluorescence. Anti-MPO and anti-PR3 antibodies were detected in those patients without

Growth and scintillation properties of Pr doped YAP with different Pr concentrations

International Nuclear Information System (INIS)

Yanagida, Takayuki; Kamada, Kei; Fujimoto, Yutaka; Sugiyama, Makoto; Furuya, Yuki; Yamaji, Akihiro; Yokota, Yuui; Yoshikawa, Akira

2010-01-01

Pr 3+ 0.2, 0.75, and 3 mol% doped YAP single crystalline scintillators were grown by using the micro-pulling down (μ-PD) method. Pr 3+ 0.05 mol% doped YAP was also prepared by using the Czochralski method. In transmittance spectra, 4f-5d absorption line appeared at 230 nm. The μ-PD grown crystals showed intense emission at 290 nm while the Czochralski grown one showed an emission peak at 245 nm in radio luminescence spectra under X-ray excitation. Among them, the Czochralski grown one exhibited the highest light yield under 137 Cs 662 keV excitation and the absolute light yield of this sample was estimated to be 20400±2000 ph/MeV. The decay time constants of these scintillators were around 10 ns due to Pr 3+ 5d-4f transition.

Growth and scintillation properties of Pr doped YAP with different Pr concentrations

Energy Technology Data Exchange (ETDEWEB)

Yanagida, Takayuki, E-mail: t_yanagi@tagen.tohoku.ac.j [Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai 980-8577 (Japan); Kamada, Kei; Fujimoto, Yutaka; Sugiyama, Makoto; Furuya, Yuki [Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai 980-8577 (Japan); Yamaji, Akihiro [New Industry Creation Hatchery Center (NICHe), Tohoku University, 6-6-10 Aoba, Aramaki, Aoba-ku, Sendai 980-8579 (Japan); Yokota, Yuui [Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai 980-8577 (Japan); Yoshikawa, Akira [Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai 980-8577 (Japan); New Industry Creation Hatchery Center (NICHe), Tohoku University, 6-6-10 Aoba, Aramaki, Aoba-ku, Sendai 980-8579 (Japan)

2010-11-21

Pr{sup 3+} 0.2, 0.75, and 3 mol% doped YAP single crystalline scintillators were grown by using the micro-pulling down ({mu}-PD) method. Pr{sup 3+} 0.05 mol% doped YAP was also prepared by using the Czochralski method. In transmittance spectra, 4f-5d absorption line appeared at 230 nm. The {mu}-PD grown crystals showed intense emission at 290 nm while the Czochralski grown one showed an emission peak at 245 nm in radio luminescence spectra under X-ray excitation. Among them, the Czochralski grown one exhibited the highest light yield under {sup 137}Cs 662 keV excitation and the absolute light yield of this sample was estimated to be 20400{+-}2000 ph/MeV. The decay time constants of these scintillators were around 10 ns due to Pr{sup 3+} 5d-4f transition.

Magnetic relaxation behaviour in Pr{sub 2}NiSi{sub 3}

Energy Technology Data Exchange (ETDEWEB)

Pakhira, Santanu, E-mail: santanupakhira20006@gmail.com; Mazumdar, Chandan; Ranganathan, R. [Condensed Matter Physics Division, Saha Institute Of Nuclear Physics, 1/AF Bidhannagar, Kolkata-700064 (India)

2016-05-06

Time dependent isothemal remanent magnetizatin (IRM) behaviour for polycrystalline compound Pr{sub 2}NiSi{sub 3} have been studied below its characteristic temperature. The compound undergoes slow magnetic relaxation with time. Along with competing interaction, non-magnetic atom disorder plays an important role in formation of non-equilibrium glassy like ground state for this compound.

Incorporation of Pr into LuAG ceramics

Science.gov (United States)

Marchewka, M. R.; Chapman, M. G.; Qian, H.; Jacobsohn, L. G.

2017-06-01

An investigation of the effects of Pr in (Lu1-xPrx)3Al5O12 (LuAG:Pr) ceramics was carried out by means of x-ray diffraction (XRD), energy dispersive x-ray spectroscopy (EDX), and attenuated total reflection Fourier transform infrared spectroscopy (ATR FTIR) measurements coupled with luminescence measurements. It was found that the Pr concentration that maximizes luminescence emission depends on the thermal processing conditions. While the calcined LuAG:Pr powder showed maximum luminescence emission for Pr concentrations between 0.18 and 0.33 at.%, maximum emission of ceramic bodies sintered at 1500 °C for 20 h was obtained with Pr concentrations between 0.018 and 0.18 at.%. Further, for short sintering times up to about 3 h, luminescence emission intensity is maximum for Pr concentrations around 0.33 at.%. Longer sintering times lead to the formation of PrAlO3 as a secondary phase, concomitant with a reduction of the intensity of luminescence emission.

[Conversion to tapentadol PR improves analgesia and quality of life in patients with severe and chronic pain despite using tramadol > 300 mg/d].

Science.gov (United States)

Richter, Uwe; Waldmann-Rex, Susanne; Lehmann, Ute

2015-06-01

This subgroup analysis of a non-interventional study involving general practitioners and internists investigated the administration of tapentadol PR (prolonged release) in patients with widely-utilized tramadol pretreatment in routine clinical practice in Germany. Data of all patients in the study cohort who had tramadol as the only opioid in their previous therapy were included in the analysis (n = 685); among them especially the 99 patients with tramadol dosages exceeding 300 mg/d were focused. Data collection during the 3-month observation period included previous and concomitant analgesic treatment, tapentadol PR dosage, pain intensity, sleep and quality of life parameters, and tolerability of tapentadol PR. Back pain was the most common cause of pain (n = 86/99), other pain diagnoses were (partly additionally) recorded in 68 cases. A mixed type of pain dominated. The previous tramadol therapy was usually combined with non-opioids (n = 74), co-analgesics (n = 44) and analgesic rescue medication (n = 35). Tapentadol PR therapy reduced the mean initial pain intensity of 7.3 ± 1.5 to 3.1 ± 1.8 points (NRS-11, 11-point pain scale, n = 96) at the end of observation, using an average dosage of 218.7 mg/d. Tapentadol PR was finally applied as the sole analgesic in 32/95 patients. 69/96 patients achieved a clinically meaningful pain relief of at least 50 %, while 63 patients gained a pain reduction of ≥ 4 NRS-points. 89/95 patients reached or exceeded their additional individual treatment goal. This was accompanied by a significant decrease in pain-related impairments of daily activities and an improvement in quality of life with an overall good tolerability of tapentadol PR. Treatment with tapentadol PR was assessed positively by physicians and patients. Data analysis shows a clinically relevant benefit in patients unsuccessfully pretreated with tramadol by consecutive conversion to the potent analgesic tapentadol PR.

New thermally stable red-emitting phosphors Pr{sup 3+}, M{sup +}:SrB{sub 4}O{sub 7} (M=Li, Na, K)

Energy Technology Data Exchange (ETDEWEB)

Xiong, F.B., E-mail: fbxiong@xmut.edu.cn [Department of Optoelectronics, Xiamen University of Technology, Xiamen 361024 (China); Fujian Provincial Key Laboratory of Optoelectronic Information Materials and Devices, Xiamen University of Technology, Xiamen 361024 (China); Lin, H.F.; Xu, Y.C.; Shen, H.X. [Department of Optoelectronics, Xiamen University of Technology, Xiamen 361024 (China); Zhu, W.Z. [Department of Optoelectronics, Xiamen University of Technology, Xiamen 361024 (China); Fujian Provincial Key Laboratory of Optoelectronic Information Materials and Devices, Xiamen University of Technology, Xiamen 361024 (China)

2016-09-15

New red-emitting phosphors Pr{sup 3+}, M{sup +}:SrB{sub 4}O{sub 7} (M=Li, Na, K) in pure phase were synthesized via high-temperature solid-state reaction. Luminescent properties of those phosphors were characterized in detail. Pr{sup 3+}, M{sup +}:SrB{sub 4}O{sub 7} (M=Li, Na, K) can be excited under the range of 430–500 nm excitation, which covers the emission spectra of blue InGaN chip, exhibits pure red emission bands centered at 605 and 662 nm. The alkali-metal Li{sup +}, Na{sup +}, or K{sup +} acting as charge compensators can improve fluorescent emission intensities of Pr{sup 3+} ions, and Pr{sup 3+}, Na{sup +}:SrB{sub 4}O{sub 7} shows the strongest emission intensities among those phosphors. Concentration quenching could be attributed to electric dipole–dipole interaction among Pr{sup 3+} ions. The temperature-dependent luminescence indicated Pr{sup 3+}, Na{sup +}:SrB{sub 4}O{sub 7} shows highly thermal stability. Those work suggests that Pr{sup 3+}, M{sup +}:SrB{sub 4}O{sub 7} (M=Li, Na, K) as thermally stable red-emitting phosphor might be potentially applied in WLED.

X-ray-scattering study of copper magnetism in nonsuperconducting PrBa2Cu3O6.92

DEFF Research Database (Denmark)

Hill, J.P.; McMorrow, D.F.; Boothroyd, A.T.

2000-01-01

X-ray magnetic scattering from ordered Cu spins has been observed in a high-T-c compound. The measurements were made on the anomalous cuprate PrBa2Cu3O6.92 with x-ray photon energies tuned in the vicinity of the Cu K edge. The high wave-vector resolution enabled us to observe an incommensurate...... double-Q Cu spin structure below T-Pr = 19 K that forms as a result of coupling between the magnetically ordered Cu and Pr sublattices. Above T-Pr, the Cu ordering is commensurate, ruling out static spin-charge stripe order as an explanation for the absence of superconductivity in this material....

Quantitative analysis of UV excitation bands for red emissions in Pr3+-doped CaTiO3, SrTiO3 and BaTiO3 phosphors by peak fitting

International Nuclear Information System (INIS)

Fujiwara, Rei; Sano, Hiroyuki; Shimizu, Mikio; Kuwabara, Makoto

2009-01-01

A quantitative spectral analysis of the ultraviolet (UV) broad excitation bands, which are located in the range 300-400 nm, for red emissions at around 610 nm in Pr-doped CaTiO 3 , SrTiO 3 :Al and BaTiO 3 :Mg phosphors has been carried out using a peak fitting technique. The obtained results demonstrate that the UV broad band of CaTiO 3 :Pr consists of four primary excitation bands centered around 330, 335, 365 and 380 nm and those of both SrTiO 3 :Al and BaTiO 3 :Mg consist of three primary bands centered around 310, 345 and 370 nm. Based on the behavior patterns and the values of the respective primary excitation bands' parameters, i.e. center gravity (λ top ), maximum height (I max ) and full-width at half-maximum (FWHM), the UV-to-red relaxation processes in these titanate phosphors can be explained to be essentially the same, except for the existence of an additional relaxation pathway via electron-trap states in CaTiO 3 :Pr, which gives a characteristic shape of its UV excitation spectrum in the wavelength range of >360 nm

Magnetization reversal and ferrimagnetism in Pr1–xNdxMnO3

Indian Academy of Sciences (India)

Detailed magnetic properties of Pr1–NdMnO3 ( = 0.3, 0.5 and 0.7) have been reported. All the samples crystallize in orthorhombic perovskite structure with Pnma space group. Magnetization measurements under field cooled (FC) protocal reveal magnetization reversal at low temperatures and low magnetic field.

78 FR 13662 - Kansas Gas Service, a Division of ONEOK, Inc.; Notice of Petition

Science.gov (United States)

2013-02-28

... DEPARTMENT OF ENERGY Federal Energy Regulatory Commission [Docket No. PR13-18-001] Kansas Gas Service, a Division of ONEOK, Inc.; Notice of Petition Take notice that on February 6, 2013, Kansas Gas... fully detailed in the petition. Any person desiring to participate in this rate filing must file in...

Magnetic resistance in Tm(Ba2x Prx)Cu3 O7+δ

International Nuclear Information System (INIS)

Mokhtari, Z.; Akhavan, M.

2003-01-01

The magnetoresistance of single phase polycrystalline Tm(Ba 2x Pr x )Cu 3 O 7+δ samples have been studied within AH model. The derives power law dependence of pinning energy and critical current density to applied magnetic field (H -n ) shows that the power factor increases with the increases of Pr content, with the average value of n≅0.2. It shows that the Pr doping plays the role of weak link. It is noticeable that the behavior of x=0 samples. This maybe due to the intragrain properties of the sample

Investigation on the structural, magnetic and magnetocaloric properties of nanocrystalline Pr-deficient Pr1-xSrxMnO3-δ manganites

Science.gov (United States)

Arun, B.; Athira, M.; Akshay, V. R.; Sudakshina, B.; Mutta, Geeta R.; Vasundhara, M.

2018-02-01

We have investigated the structural, magnetic and magnetocaloric properties of nanocrystalline Pr-deficient Pr1-xSrxMnO3-δ Perovskite manganites. Rietveld refinement of the X-ray powder diffraction patterns confirms that all the studied compounds have crystallized into an orthorhombic structure with Pbnm space group. Transmission electron microscopy analysis reveals nanocrystalline compounds with crystallite size less than 50 nm. The selected area electron diffraction patterns reveal the highly crystalline nature of the compounds and energy dispersive X-ray spectroscopic analysis shows that the obtained compositions are nearly identical with the nominal one. The oxygen stoichiometry is estimated by iodometric titration method and stoichiometric compositions are confirmed by X-ray Fluorescence Spectrometry analysis. A large bifurcation is observed in the ZFC/FC curves and Arrott plots not show a linear relation but have a convex curvature nature. The temperature dependence of inverse magnetic susceptibility at higher temperature confirms the existence of ferromagnetic clusters. The experimental results reveal that the reduction of crystallite size to nano metric scale in Pr-deficient manganites adversely influences structural, magnetic and magnetocaloric properties as compared to its bulk counterparts reported earlier.

New insights on the synthesis and electronic transport in bulk polycrystalline Pr-doped SrTiO3−δ

International Nuclear Information System (INIS)

Dehkordi, Arash Mehdizadeh; Bhattacharya, Sriparna; Darroudi, Taghi; Alshareef, Husam N.; Tritt, Terry M.

2015-01-01

Recently, we have reported a significant enhancement in the electronic and thermoelectric properties of bulk polycrystalline SrTiO 3 ceramics via praseodymium doping. This improvement was originated from the simultaneous enhancement in the thermoelectric power factor and reduction in thermal conductivity, which was contributed to the non-uniform distribution of Pr dopants. In order to further understand the underlying mechanism, we herein investigate the role of praseodymium doping source (Pr 2 O 3 versus Pr 6 O 11 ) on the synthesis and electronic transport in Pr-doped SrTiO 3 ceramics. It was observed that the high-temperature electronic transport properties are independent of the choice of praseodymium doping source for samples prepared following our synthesis strategy. Theoretical calculations were also performed in order to estimate the maximum achievable power factor and the corresponding optimal carrier concentration. The result suggests the possibility of further improvement of the power factor. This study should shed some light on the superior electronic transport in bulk polycrystalline Pr-doped SrTiO 3 ceramics and provide new insight on further improvement of the thermoelectric power factor

New insights on the synthesis and electronic transport in bulk polycrystalline Pr-doped SrTiO3−δ

KAUST Repository

Dehkordi, Arash Mehdizadeh

2015-02-07

Recently, we have reported a significant enhancement in the electronic and thermoelectric properties of bulk polycrystalline SrTiO3 ceramics via praseodymium doping. This improvement was originated from the simultaneous enhancement in the thermoelectric power factor and reduction in thermal conductivity, which was contributed to the non-uniform distribution of Pr dopants. In order to further understand the underlying mechanism, we herein investigate the role of praseodymium doping source (Pr2O3 versus Pr6O11) on the synthesis and electronic transport in Pr-doped SrTiO3 ceramics. It was observed that the high-temperature electronic transport properties are independent of the choice of praseodymium doping source for samples prepared following our synthesis strategy. Theoretical calculations were also performed in order to estimate the maximum achievable power factor and the corresponding optimal carrier concentration. The result suggests the possibility of further improvement of the power factor. This study should shed some light on the superior electronic transport in bulk polycrystalline Pr-doped SrTiO3 ceramics and provide new insight on further improvement of the thermoelectric power factor.

Theory of the 4d → 2p X-ray emission spectroscopy in Ce2O3, Pr2O3 and Dy2O3

International Nuclear Information System (INIS)

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

1995-01-01

The 4d → 2p X-ray emission spectra (XES) of Ce 2 O 3 , Pr 2 O 3 and Dy 2 O 3 have been calculated with an impurity Anderson model with the full multiplet couplings, following the Kramers-Heisenberg formula in the second order optical process. Experimental results have been well reproduced with this model by using a constant value for the 4d core hole lifetime damping Γ(4d) in the case of Ce 2 O 3 and Pr 2 O 3 , while in the case of Dy 2 O 3 it is necessary to take into account the term dependence of Γ(4d), which is consistent with the previous theoretical analyses of 4d X-ray photoemission spectra. It was also shown that both the spin-orbit couplings of the 4d core level in the final state and the 4f level in the initial state are key factors to cause the branching ratio in the L γ line larger than that in the L β line. The phase matching of the wave functions between the intermediate and final states smears out the hybridization effect in the 4d → 2p XES in Ce 2 O 3 and Pr 2 O 3 . (author)

Specific heat of rare earth cobaltates RCoO{sub 3} (R = La, Pr and Nd)

Energy Technology Data Exchange (ETDEWEB)

Thakur, Rasna, E-mail: rasnathakur@yahoo.com [Department of Physics, Barkatullah University, Bhopal 462026 (India); Srivastava, Archana [Department of Physics, Sri Sathya Sai College for Women, Bhopal 462024 (India); Thakur, Rajesh K.; Gaur, N.K. [Department of Physics, Barkatullah University, Bhopal 462026 (India)

2012-03-05

Highlights: Black-Right-Pointing-Pointer We have reported the temperature dependence (5 K {<=} T {<=} 1000 K) of the lattice contribution to the specific heat of rhombohedral LaCoO{sub 3} and orthocobaltates RCoO{sub 3} (R = Pr and Nd). Black-Right-Pointing-Pointer The strong electron phonon interactions are present in these compounds and lattice distortions can affect them substantially. Black-Right-Pointing-Pointer Thus Rigid Ion Model (RIM) is used for the first time to study the cohesive and thermal properties of the cobaltates RCoO{sub 3} with rare earth cation (R = La, Pr and Nd). Black-Right-Pointing-Pointer The values of specific heat calculated by us have shown remarkably good agreement with corresponding experimental data. Black-Right-Pointing-Pointer In addition, the results on the temperature dependence of cohesive energy ({phi}), molecular force constant (f), Reststrahlen frequency ({upsilon}), Debye temperature ({theta}{sub D}) and Gruneisen parameter ({gamma}) are also reported. - Abstract: We have reported the temperature dependence (5 K {<=} T {<=} 1000 K) of the lattice contribution to the specific heat of rhombohedral LaCoO{sub 3} and orthocobaltates RCoO{sub 3} (R = Pr and Nd). The strong electron phonon interactions are present in these compounds and lattice distortions can affect them substantially. Thus Rigid Ion Model (RIM) is used for the first time to study the cohesive and thermal properties of the cobaltates RCoO{sub 3} with rare earth cation (R = La, Pr and Nd). The values of specific heat calculated by us have shown remarkably good agreement with corresponding experimental data. In addition, the results on the temperature dependence of cohesive energy ({phi}), molecular force constant (f), Reststrahlen frequency ({upsilon}), Debye temperature ({theta}{sub D}) and Gruneisen parameter ({gamma}) are also reported.

Magnetic properties and structural transitions of fluorite-related rare earth osmates Ln{sub 3}OsO{sub 7} (Ln=Pr, Tb)

Energy Technology Data Exchange (ETDEWEB)

Hinatsu, Yukio, E-mail: hinatsu@sci.hokudai.ac.jp [Division of Chemistry, Graduate School of Science, Hokkaido University, Sapporo 060-0810 (Japan); Doi, Yoshihiro [Division of Chemistry, Graduate School of Science, Hokkaido University, Sapporo 060-0810 (Japan)

2013-02-15

Ternary rare-earth osmates Ln{sub 3}OsO{sub 7} (Ln=Pr, Tb) have been prepared. They crystallize in an ortho-rhombic superstructure of cubic fluorite with space group Cmcm. Both of these compounds undergo a structural phase transition at 130 K (Ln=Pr) and 580 K (Ln=Tb). These compounds show complex magnetic behavior at low temperatures. Pr{sub 3}OsO{sub 7} exhibits magnetic transitions at 8 and 73 K, and Tb{sub 3}OsO{sub 7} magnetically orders at 8 and 60 K. The Os moments become one-dimensionally ordered, and when the temperature is furthermore decreased, it provokes the ordering in the Ln{sup 3+} sublattice that simultaneously becomes three-dimensionally ordered with the Os sublattice. - Graphical abstract: Ternary rare-earth osmates Ln{sub 3}OsO{sub 7} (Ln=Pr, Tb) have been prepared. They crystallize in an orthorhombic superstructure of cubic fluorite with space group Cmcm. Both of these compounds undergo a structural phase transition at 130 K (Ln=Pr) and 580 K (Ln=Tb). These compounds show complex magnetic behavior at low temperatures. Pr{sub 3}OsO{sub 7} exhibits magnetic transitions at 8 and 73 K, and Tb{sub 3}OsO{sub 7} magnetically orders at 8 and 60 K. Highlights: Black-Right-Pointing-Pointer Ternary rare-earth osmates Ln{sub 3}OsO{sub 7} (Ln=Pr, Tb) with an ordered defect-fluorite structure have been prepared. Black-Right-Pointing-Pointer Both of these compounds undergo a structural phase transition at 130 K (Ln=Pr) and 580 K (Ln=Tb). Black-Right-Pointing-Pointer These compounds show complex magnetic behavior at low temperatures due to magnetic ordering of Ln and Os.

Laser operated elasto-optical features of La2CaB10O19:Pr3+ polymer nanocomposites

International Nuclear Information System (INIS)

Majchrowski, A.; Lakshminarayana, G.; Reshak, A.H.; Michalski, E.; Olifierczuk, M.; Ozga, K.; Jaroszewicz, L.; Lukasiewicz, T.; Szota, M.; Nabialek, M.

2012-01-01

We have discovered a principal role of the polymer matrices on the spectral dependences of piezooptical coefficients of La 2 CaB 10 O 19 :Pr 3+ (LCBO:Pr) nanocomposites formed by polymethylmethacrylate (PMMA) and polycarbonate (PC) matrices. It was established that the optical treatment by the 10 ns Nd:YAG laser can cause substantial changes of the dispersion of the piezooptical coefficients within the spectral wavelength 1400–1600 nm. The optimal content of the LCBO:Pr with sizes ranging from 40 to 110 nm corresponds to 4–6% in weighing units. Following the performed quantum chemical simulations, the observed changes are caused by different polarizabilities of the polymer matrices. - Highlights: ► Spectral dependences of piezooptical coefficients of La 2 CaB 10 O 19 :Pr 3+ nanocomposites were studied. ► Substantial enhancement of the piezooptical dispersion was observed within the spectral range 1440–1520 nm. ► The observed changes are caused by different polarizabilities of the polymer matrices.

Praseodymium valency from crystal structure in Pr-Ba-Cu-O and (Y-Pr)-Ba-Cu-O single crystals

International Nuclear Information System (INIS)

Collin, G.; Albouy, P.A.; Monod, P.; Ribault, M.

1990-01-01

The substitution of Pr to Y leads to materials with a general formula (Y 1-v Pr v ) (Ba 2-x Pr x ) (Cu 3-y vac y ) O 6+x/2-y+z and with a structural transition around v + x' ∼ 0.5. For v + x 0.5 the crystals are tetragonal, La 1.5 Ba 1.5 Cu 3 O 7±z type, with the characteristic tri-twinning of this phase. The Pr valency, in the range 3-3.2 + depending on preparation conditions, is determined from interatomic distances. Orthorhombic crystals of Pr Ba Cu O prepared at high temperatures exhibit a high amount of defects, y ∼ 0.25 on the Cu(1) site and are semiconductors with a T -1/4 activation law attributed to the praseodymium valence fluctuation

Decay mechanism of the fsub(7/2) isobaric analog state of 141Pr, (2)

International Nuclear Information System (INIS)

Uegaki, Junichi; Shoda, Katsufusa

1975-01-01

Experimental results on the f7/2 IAR(isobaric analog resonance) by 141 Pr (e, e'p) reaction were reported previously. This paper presents the results of further measurement on this reaction. The energy spectra of protons emitted by the 141 Pr (e, e'p) reaction, obtained at the electron energy Ee of 16.3, 15.5, 14.8 and 14.1 MeV, are shown. A peak seen at the proton energy Ep of 9.5 MeV in the spectrum taken at Ee=16.3 MeV shows the proton group decaying from the f7/2 isobaric analog state (IAS) to 140 Ce ground state, and the excitation energy of the f7/2 IAS was calculated as Ex=14.8 MeV. The cross-section of the reaction 141 Pr (γ, p 0 ) can be estimated from the spectra obtained, and was compared with that estimated from the 140 Ce (p, γ 0 ) reaction. The cross-section of the 141 Pr (e, e'p) reaction is shown as a function of incident electron energy, and the resonance intensity of the f7/2 IAR was estimated as (2.7 +- 1.3) x 10 -28 cm 2 MeV. The radiation width of the f7/2 IAR of 141 Pr was 25.8 eV, and this value is not in agreement with that obtained from 141 Pr (p, γ 0 ). The proton spectra of 141 Pr (γ, p) reaction can be obtained from the proton spectra of 141 Pr (e, e'p) reaction by assuming virtual photon spectra. The result was compared with the result of 140 Ce (p, p') reaction. The one particle-one hole state of neutrons distributed over the energy range between 5.3 and 6.3 MeV, and the first excited 2 + state was seen at Esub(p)=7.9 MeV. In the range between 6.3 and 7.8 MeV, a proton group existed, which did not agree with the data of proton scattering. More precise study is under consideration. (Kato, T.)