Sample records for yttrium 88 target

  1. Process for separation of zirconium-88, rubidium-83 and yttrium-88

    Microsoft Academic Search

    R. C. Heaton; D. J. Sr. Jamriska; W. A. Taylor

    1994-01-01

    A process for selective separation of strontium-82 and strontium-85 from proton irradiated molybdenum targets is provided and includes dissolving the molybdenum target in a hydrogen peroxide solution to form a first ion-containing solution, passing the first ion-containing solution through a first cationic resin whereby ions selected from the group consisting of molybdenum, niobium, technetium, selenium, vanadium, arsenic, germanium, zirconium and

  2. Separation of lanthanum, hafnium, barium and radiotracers yttrium-88 and barium-133 using crystalline zirconium phosphate and phosphonate compounds as prospective materials for a Ra-223 radioisotope generator.

    PubMed

    Möller, Teresia; Bestaoui, Naima; Wierzbicki, Melissa; Adams, Todd; Clearfield, Abraham

    2011-07-01

    Crystalline hybrid organic/inorganic ion exchangers based on zirconium phosphate and phosphonate compounds were evaluated for application in radium-223 generator for radiopharmaceutical applications. Various compositions were synthesized and the selectivity of these materials was determined for inactive lanthanum, hafnium and barium, and radiotracers yttrium-88 and barium-133. The hybrid materials show very efficient lanthanum/barium separation; the response for zirconium phosphate was even better. A small-scale column loaded with pelletized zirconium phosphate compound demonstrated excellent retention of (88)Y and release of (133)Ba. PMID:21421323

  3. Laser plume spectroscopy. 2. Graphite yttrium-stabilised and zirconium oxide targets

    SciTech Connect

    Osipov, V V; Solomonov, V I; Platonov, V V; Snigireva, O A; Ivanov, M G; Lisenkov, V V [Institute of Electrophysics, Ural Branch of the Russian Academy of Sciences, Yekaterinburg, Russian Federstion (Russian Federation)

    2005-07-31

    Spectral and kinetic properties of a plume formed in the vicinity of a graphite and a pressed yttrium-stabilised zirconium oxide (YSZ) powder targets irradiated in air by a 10.6-{mu}m pulsed CO{sub 2} laser with a peak power of 1.5-9 kW at room temperature are studied. The plume propagated at right angles to the target surface and at an angle of 45{sup 0} to the laser radiation. The spectral and kinetic characteristics of its luminescence were measured discretely along the entire length of the plume. It is shown that the YSZ plume as well as the graphite plume is a flux of nonequilibrium gaseous plasma at a temperature of about 4.7-3.1 kK, in which a luminescence of YO and ZrO radicals is excited. (interaction of laser radiation with matter. laser plasma)

  4. Nitrogen contamination effect on yttrium gettering of hydrogen in liquid lithium

    NASA Astrophysics Data System (ADS)

    Yagi, Juro; Suzuki, Akihiro; Terai, Takayuki

    2011-10-01

    Yttrium is a candidate for hydrogen hot trapping in a liquid tritium breeder of a fusion reactor blanket and in the flowing target of the International Fusion Materials Irradiation Facility, IFMIF. Nitrogen impurity in lithium is expected to decrease hydrogen trapping but this has not been confirmed. This study, directed at developing a hydrogen permeation device as a hydrogen concentration monitor in lithium, investigated hot trapping by yttrium in lithium. The hydrogen trapping rate of yttrium first aged in lithium containing nitrogen was smaller than the rate without nitrogen contamination. Nitrogen in contaminated yttrium did not form yttrium nitride, and the nitrogen diffused much deeper into the yttrium than did oxygen.

  5. Identification of MyD88 as a novel target of miR155, involved in negative regulation of Helicobacter pylori-induced inflammation

    Microsoft Academic Search

    Bin Tang; Bin Xiao; Zhen Liu; Na Li; En-Dong Zhu; Bo-Sheng Li; Qing-Hua Xie; Yuan Zhuang; Quan-Ming Zou; Xu-Hu Mao

    2010-01-01

    MicroRNA-155 (miR-155) has been implicated as a central regulator of the immune system. We have previously reported that miR-155 negatively regulates Helicobacter pylori (H. pylori)-induced inflammation, but the molecular mechanism of miR-155 regulating the inflammation is not fully clear. Here, we identified myeloid differentiation protein 88 (MyD88) as a target gene of miR-155, and found that miR-155 decreased MyD88 expression

  6. Metals Fact Sheet: Yttrium

    SciTech Connect

    NONE

    1992-09-01

    Yttrium is a metallic element usually included among the rare earth metals, which it resembles chemically and with which it usually occurs in minerals. Yttrium was named after the village of Ytterby in Sweden---the element was discovered in a quarry near the village. This article discusses sources of the element, the world market for the element, and various applications of the material.

  7. Theranostic Imaging of Yttrium-90

    PubMed Central

    Wright, Chadwick L.; Zhang, Jun; Tweedle, Michael F.; Knopp, Michael V.; Hall, Nathan C.

    2015-01-01

    This paper overviews Yttrium-90 (90Y) as a theranostic and nuclear medicine imaging of 90Y radioactivity with bremsstrahlung imaging and positron emission tomography. In addition, detection and optical imaging of 90Y radioactivity using Cerenkov luminescence will also be reviewed. Methods and approaches for qualitative and quantitative 90Y imaging will be briefly discussed. Although challenges remain for 90Y imaging, continued clinical demand for predictive imaging response assessment and target/nontarget dosimetry will drive research and technical innovation to provide greater clinical utility of 90Y as a theranostic agent.

  8. Nanoscale yttrium distribution in yttrium-doped ceria powder

    Microsoft Academic Search

    Shao-Ju Shih; Lan-Yun Shery Chang; Chin-Yi Chen; Konstantin B. Borisenko; David J. H. Cockayne

    2009-01-01

    The microstructure and geometry of yttrium-doped ceria particles, synthesized by spray pyrolysis (SP), were characterized\\u000a by transmission electron microscopy, and the distribution of yttrium was investigated by energy-dispersive X-ray spectroscopy\\u000a (EDX). The yttrium distribution was investigated by considering an electron interaction volume and geometry of the particle\\u000a in an EDX profile analysis. Two models, linear and non-linear, for the yttrium

  9. Thermal properties of yttrium hydride

    NASA Astrophysics Data System (ADS)

    Ito, Masato; Matsunaga, Junji; Setoyama, Daigo; Muta, Hiroaki; Kurosaki, Ken; Uno, Masayoshi; Yamanaka, Shinsuke

    2005-09-01

    The thermal properties of ?-phase yttrium hydrides (YH x: x = 1.72-2.00) were studied in the temperature range from 300 to 773 K. The heat capacities of yttrium hydrides are larger than that of yttrium metal because of hydrogen optical vibration. The thermal conductivities of the yttrium hydrides are larger than that of metal and have strong dependence on temperature. They are not markedly influenced by the hydrogen content.

  10. Investigation of yttrium and yttrium hydride by AES and REELS

    NASA Astrophysics Data System (ADS)

    Bracconi, P.; Pörschke, E.; Lässer, R.

    1988-08-01

    The results of combined investigations by Auger electron spectroscopy (AES) and reflection electron energy loss spectroscopy (REELS) of thin films of yttrium and yttrium hydride are presented. The hydride phase was prepared by exposing evaporated metal films to hydrogen in a high pressure reaction chamber connected to the main UHV vessel. Special attention was paid to the effects of surface contamination by oxygen. The specific spectroscopic characteristics of the metal and the hydride phase are compared and analysed in terms of the known electronic structures of yttrium and yttrium hydrides.

  11. Astatine and Yttrium Resonant Ionization Laser Spectroscopy

    NASA Astrophysics Data System (ADS)

    Teigelhoefer, Andrea

    Providing intense, contamination-free beams of rare isotopes to experiments is a challenging task. At isotope separator on-line facilities such as ISAC at TRIUMF, the choice of production target and ion source are key to the successful beam delivery. Due to their element-selectivity, high efficiency and versatility, resonant ionization laser ion sources (RILIS) gain increasingly in importance. The spectroscopic data available are typically incomplete in the region of excited- and autoionizing atomic states. In order to find the most efficient ionization scheme for a particular element, further spectroscopy is often required. The development of efficient laser resonant ionization schemes for yttrium and astatine is presented in this thesis. For yttrium, two ionization schemes with comparable relative intensities were found. Since for astatine, only two transitions were known, the focus was to provide data on atomic energy levels using resonance ionization spectroscopy. Altogether 41 previously unknown astatine energy levels were found.

  12. Photochromism in yttrium hydride

    NASA Astrophysics Data System (ADS)

    Ohmura, Ayako; Machida, Akihiko; Watanuki, Tetsu; Aoki, Katsutoshi; Nakano, Satoshi; Takemura, K.

    2007-10-01

    Transparent orange yttrium hydride turns to black when illuminated by visible laser light at pressures of several gigapascals at room temperature. The marked reduction in optical transmittance extends over the infrared region, suggesting that illumination creates persistent free carriers. The opaque black sample returns to the transparent orange hydride during room-temperature annealing for a few hours. Photochromism is pronounced for the coexistent state of the metallic fcc-YH2 and the insulating hexagonal-YH3 state but is depressed for the single phase of hexagonal-YH3. The results indicate that light illumination can modify the optical and possibly electronic properties during a certain period of times.

  13. Effect of pulses from a high-power ytterbium fiber laser on a material with a nonuniform refractive index. I. Irradiation of yttrium oxide targets

    NASA Astrophysics Data System (ADS)

    Osipov, V. V.; Lisenkov, V. V.; Platonov, V. V.; Orlov, A. N.; Podkin, A. V.; Savvin, I. A.

    2014-05-01

    The irradiation of Nd:Y2O3 targets with an absorption coefficient of 13-1.7 × 103 cm-1 using laser pulses with a duration of 0.1-3.5 ms and peak power of 200-700 W at a power density of (0.2-1.3) × 106 W/cm2 is studied. A relatively large spread of the delay times of laser plume, spike emission of the laser plume, cleavage of the front surface of the target, and greater ejection of substance from the crater in comparison with the effect of the CO2-laser radiation with almost the same power are demonstrated. A numerical model of the effect of radiation on a target with a nonuniform refractive index is proposed to interpret the destruction of dielectric material (cleavage of the front surface) and the large spread of the delay times of the plume.

  14. Side Effects of Yttrium-90 Radioembolization

    PubMed Central

    Riaz, Ahsun; Awais, Rafia; Salem, Riad

    2014-01-01

    Limited therapeutic options are available for hepatic malignancies. Image guided targeted therapies have established their role in management of primary and secondary hepatic malignancies. Radioembolization with yttrium-90 (90Y) microspheres is safe and efficacious for treatment of hepatic malignancies. The tumoricidal effect of radioembolization is predominantly due to radioactivity and not ischemia. This article will present a comprehensive review of the side effects that have been associated with radioembolization using 90Y microspheres. Some of the described side effects are associated with all transarterial procedures. Side effects specific to radioembolization will also be discussed in detail. Methods to decrease the incidence of these potential side effects will also be discussed. PMID:25120955

  15. Measurement of Cross-sections of Yttrium (n,xn) Threshold Reactions by Means of Gamma Spectroscopy

    NASA Astrophysics Data System (ADS)

    Chudoba, P.; Kilim, S.; Wagner, V.; Vrzalova, J.; Svoboda, O.; Majerle, M.; Stefanik, M.; Suchopar, M.; Kugler, A.; Bielewicz, M.; Strugalska-Gola, E.; Szuta, M.; Hervas, D.; Herman, T.; Geier, B.

    Neutron activation and gamma spectrometry are usable also for the determination of cross-sections of different neutron reactions. We have studied the cross-section of yttrium (n,xn) threshold reactions using quasi mono-energetic neutron source based on the reaction on 7Li target at Nuclear Physics Institute of ASCR in Rez. Yttrium (n,xn) threshold reactions are suitable candidates for fast neutron field measurement by activation detectors. Fast neutron field monitoring is necessary already today at a wide range of accelerator facilities and will gain on importance in future fast reactors of generation IV, accelerator transmutation systems or fusion reactors. The knowledge of the cross-sections is crucial for such purpose. Unfortunately, the cross-section is sufficiently known only for 89Y(n,2n)88Y reaction. For higher orders of reactions there are almost no experimental data. Special attention was paid to the 89Y(n,3n)87Y reaction. The nuclei are produced, both in the ground state with half-life 79.8 hours and in the isomeric state with half-life 13.38 hours. The isomer decays mainly through the gamma transition to the ground state, the beta decay of the excited state is negligible within our accuracy. The cross-sections of both 87Y productions were analyzed.

  16. SPECIFIC INHIBITION OF MYD88-INDEPENDENT SIGNALING PATHWAYS OF TOLL-LIKE RECEPTOR 3 AND 4 BY RESVERATROL: MOLECULAR TARGETS ARE TBK1 IN TRIF COMPLEX*

    Technology Transfer Automated Retrieval System (TEKTRAN)

    Toll-like receptors can activate two distinct branches of downstream signaling pathways: MyD88 and TRIF pathways lead to the expression of pro-imflammatory cytokines and type I interferon genes, respectively. Numerous reports have demonstrated that resveratrol, a phytoalexin with anti-inflammatory ...

  17. Reactivity of yttrium carboxylates toward alkylaluminum hydrides.

    PubMed

    Schädle, Christoph; Fischbach, Andreas; Herdtweck, Eberhardt; Törnroos, Karl W; Anwander, Reiner

    2013-11-25

    Yttrocene-carboxylate complex [Cp*2Y(OOCAr(Me))] (Cp*=C5Me5, Ar(Me) =C6H2Me3-2,4,6) was synthesized as a spectroscopically versatile model system for investigating the reactivity of alkylaluminum hydrides towards rare-earth-metal carboxylates. Equimolar reactions with bis-neosilylaluminum hydride and dimethylaluminum hydride gave adduct complexes of the general formula [Cp*2Y(?-OOCAr(Me))(?-H)AlR2] (R=CH2SiMe3, Me). The use of an excess of the respective aluminum hydride led to the formation of product mixtures, from which the yttrium-aluminum-hydride complex [{Cp*2Y(?-H)AlMe2(?-H)AlMe2(?-CH3)}2] could be isolated, which features a 12-membered-ring structure. The adduct complexes [Cp*2Y(?-OOCAr(Me))(?-H)AlR2] display identical (1)J(Y,H) coupling constants of 24.5 Hz for the bridging hydrido ligands and similar (89)Y NMR shifts of ?=-88.1 ppm (R=CH2SiMe3) and ?=-86.3 ppm (R=Me) in the (89)Y DEPT45 NMR experiments. PMID:24151216

  18. Sputter deposition of yttrium--oxides

    Microsoft Academic Search

    A. F. Jankowski; L. R. Schrawyer; J. P. Hayes

    1993-01-01

    The yttrium--oxide phase diagram contains only one equilibrium compound, a Y[sub 2]O[sub 3] cubic structure. The process of reactive sputter deposition is used to synthesize previously unreported, yttrium-rich oxide compounds. A planar magnetron is operated in the direct--current mode using a working gas mixture of argon--20% oxygen. For low sputter gas pressure and flow conditions, the yttrium content of the

  19. Electronic Transitions of Yttrium Monoxide

    NASA Astrophysics Data System (ADS)

    Ng, Y. W.; Wang, Na; Clark, Andrew B.; Cheung, A. S.-C.

    2013-06-01

    The electronic transition spectrum of yttrium monoxide (YO) in the spectral region between 284nm and 307nm has been recorded using laser ablation/reaction free-jet expansion and laser induced fluorescence (LIF) spectroscopy. The YO molecule was produced by reacting laser-ablated yttrium atoms with O_{2} seeded in argon. Twenty transition bands were observed in that region and a few bands were selected for further study using optical-optical double resonance (OODR) spectroscopy. The excited C^{2} ? state has been reached via the intermediate B^{2} ?^{+} state from the ground X^{2} ?^{+} state. The excited sub-states observed so far have ? = 0.5 and 1.5. A least squares fit of the measured rotational lines yielded molecular constants for the newly observed excited states.

  20. Electronic structure of yttrium oxide

    Microsoft Academic Search

    F. Jollet; C. Noguera; N. Thromat; M. Gautier; J. P. Duraud

    1990-01-01

    The electronic structure of stoichiometric Y2O3 is studied both theoretically and experimentally. X-ray absorption, performed through total-yield measurements at the K and LII edges of yttrium atoms and the K edge of oxygen atoms, through total-yield measurements has given access to empty states of various orbital characters in the conduction band. The shape of the valence band was obtained by

  1. Laser damage in yttrium orthophosphate

    NASA Astrophysics Data System (ADS)

    Allen, R.; Esterowitz, L.; Klein, P. H.; Nicolai, V. O.; Zwicker, W. K.

    1980-07-01

    Laser damage experiments on single crystal blades of yttrium orthophosphate were performed. Crystals were grown by slow cooling of a flux containing lead pyrophosphate. Optical absorption is small from about 300 nm to about 3200 nm, approximating the transmission of calcite. A 1.06 micrometer neodymium glass laser with Q-switched pulse duration of 17 ns was used for damage measurements. The laser beam (0.025 cm FWHM) was focussed on the large face of the YPO4 crystals. Visible damage was always observed at front and back crystal surfaces following exposure to pulses averaging 3.6 GW/square centimeter or more. No visible damage was found in YPO4 at power densities less than 2.2 - 2.4 GW/square centimeter. Calcite crystals showed damage at somewhat smaller power densities.

  2. Urinary yttrium excretion and effects of yttrium chloride on renal function in rats.

    PubMed

    Hayashi, Satsuki; Usuda, Kan; Mitsui, Go; Shibutani, Takahiro; Dote, Emi; Adachi, Kazuya; Fujihara, Michiko; Shimbo, Yukari; Sun, Wei; Kono, Rei; Tsuji, Hiroshi; Kono, Koichi

    2006-01-01

    Evaluation of yttrium exposure in biological samples has not been fully examined. To evaluate yttrium nephrotoxicity, yttrium chloride was orally administered to male Wistar rats and the urine volume (UV) and N-acetyl-beta-D-glucosaminidase (NAG) and creatinine excretion (Crt) were measured in 24-h urine samples. The urinary yttrium concentration and excretion rate were determined by inductively coupled plasma-argon emission spectrometry (ICP-AES). Large significant decreases of UV (>30%) and Crt (>10%) were observed at yttrium doses of 58.3-116.7 mg per rat, but no significant NAG changes was observed. This response pattern shows that a high yttrium dosage alters glomerular function rather than the proximal convoluted tubules. A urinary yttrium excretion rate of 0.216% and good dose-dependent urinary excretion (r=0.77) were confirmed. These results suggest that urinary yttrium is a suitable indicator of occupational and environmental exposure to this element, an increasingly important health issue because recent technological advances present significant potential risks of exposure to rare earth elements. We propose that the ICP-AES analytical method and animal experimental model described in this study will be a valuable tool for future research on the toxicology of rare earth elements. PMID:17206005

  3. Yttrium hydride nanoantennas for active plasmonics.

    PubMed

    Strohfeldt, Nikolai; Tittl, Andreas; Schäferling, Martin; Neubrech, Frank; Kreibig, Uwe; Griessen, Ronald; Giessen, Harald

    2014-03-12

    A key challenge for the development of active plasmonic nanodevices is the lack of materials with fully controllable plasmonic properties. In this work, we demonstrate that a plasmonic resonance in top-down nanofabricated yttrium antennas can be completely and reversibly turned on and off using hydrogen exposure. We fabricate arrays of yttrium nanorods and optically observe, in extinction spectra, the hydrogen-induced phase transition between the metallic yttrium dihydride and the insulating trihydride. Whereas the yttrium dihydride nanostructures exhibit a pronounced particle plasmon resonance, the transition to yttrium trihydride leads to a complete vanishing of the resonant behavior. The plasmonic resonance in the dihydride state can be tuned over a wide wavelength range by simply varying the size of the nanostructures. Furthermore, we develop an analytical diffusion model to explain the temporal behavior of the hydrogen loading and unloading trajectories observed in our experiments and gain information about the thermodynamics of our device. Thus, our nanorod system serves as a versatile basic building block for active plasmonic devices ranging from switchable perfect absorbers to active local heating control elements. PMID:24576073

  4. Yttrium hole-barrier contacts for germanium semiconductor detectors

    NASA Astrophysics Data System (ADS)

    Hull, Ethan L.; Pehl, Richard H.; Lathrop, James R.; Suttle, Bruce E.

    2011-01-01

    Sputtered yttrium metal forms a thin hole-barrier contact on both p- and n-type germanium semiconductor detectors. Yttrium contacts can provide a sufficiently high hole barrier to prevent measurable contact leakage current below ˜120 K. Detectors having yttrium contacts produce good gamma-ray spectroscopy data.

  5. Reaction of yttrium polonides with carbon dioxide

    SciTech Connect

    Abakumov, A.S.; Khokhlov, A.D.; Reznikova, N.F.

    1986-09-01

    It has been proved that heating of yttrium and tantalum in carbon dioxide to 500 and 800/sup 0/C alters the gas phase composition, causing formation of carbon monoxide and reduction of oxygen content. A study of the thermal stability of yttrium polonides in carbon dioxide showed that yttrium sesqui- and monopolonides decompose at 400-430/sup 0/C. The temperature dependence of the vapor pressure of polonium obtained upon decomposition of the referred polonides has been determined in a carbon dioxide environment radiotensometrically. The enthalpy of the process calculated from this dependence is close to the enthalpy of vaporization of elemental polonium in vacuo. The mechanism of the reactions has been suggested.

  6. Superconductivity in Yttrium Metal at 17 K

    NASA Astrophysics Data System (ADS)

    Hamlin, James J.; Tissen, Vladimir G.; Schilling, James S.

    2006-03-01

    Many of the known elemental superconductors only become superconducting if high pressure is applied. In 1970 J. Wittig [1] discovered superconductivity in yttrium metal at 1.2 K under 11 GPa pressure, Tc increasing to 2.7 K at 16 GPa. Using a diamond-anvil cell with dense helium pressure medium, we have extended this pressure range to 89 GPa. We find that Tc for yttrium metal reaches values as high as 17 K (ac susceptibility midpoint), one of the highest transition temperatures ever observed for an elemental superconductor. [1] J. Wittig, Phys. Rev. Lett. 24, 812 (1970).

  7. Superconducting wires based on a yttrium ceramic

    NASA Astrophysics Data System (ADS)

    Mitrokhin, V. A.; Dzhetymov, A. M.; Radchenko, I. P.; Svalov, G. G.; Sytnikov, V. E.; Aleksandrov, V. V.; Miuller, P.; Shubert, M.

    1991-12-01

    A study was made of the fabrication of high temperature superconducting ceramic wires based on yttrium in various metallic shells. The shells used in the process were 10-mm-diameter thin-walled tubes of stainless steel (Kh18N10T), Nimonic alloy (Kh20N80), copper, and silver. Measurements of the critical current density is presented for the best specimens of round and rectangular cross sections. It is found that alloying of the yttrium ceramic by silver and gold makes it possible to double its current-carrying capacity.

  8. Thermoluminescent and optical absorption properties of neodymium doped yttrium aluminoborate and yttrium calcium borate glasses

    Microsoft Academic Search

    E. M. Yoshimura; C. N. Santos; A. Ibanez; A. C. Hernandes

    2009-01-01

    Neodymium doped yttrium aluminoborate and yttrium calcium borate glasses were prepared by the conventional melting-quenching technique with neodymium concentration varying from 0.10 to 1.0mol%. The obtained glasses present a wide transparency in the UV–visible region (till 240nm). The thermoluminescent (TL) emission of beta-irradiated samples was measured, showing a broad peak at ?240°C with intensities related to the Nd3+ content, for

  9. Low energy cyclotron production and separation of yttrium-86 for evaluation of monoclonal antibody pharmacokinetics and dosimetry

    NASA Astrophysics Data System (ADS)

    Finn, R. D.; McDevitt, M.; Ma, D.; Jurcic, J.; Scheinberg, D.; Larson, S.; Shoner, S.; Link, J.; Krohn, K.; Schlyer, D.

    1999-06-01

    Although an excellent radionuclide for application to systemic isotopic therapy when complexed to various monoclonal antibodies, the lack of photon emission from yttrium-90 makes the determination of the pharmacokinetics and dosimetry of the resultant radiopharmaceutical difficult. The introduction of the positron-emitting radionuclide yttrium-86 (T1/2=14.7 h, ?+=33%) provides the non-invasive quantitation for the biodistribution of the chelated complex. The yttrium-86 radionuclide is produced at Memorial Sloan-Kettering using the CS-15 cyclotron via the (p,n) nuclear reaction on an enriched strontium-86 target. The separation is effectively achieved through a combination of solvent extraction and ion exchange chromatography. Once investigational new drug approval has been received, the mixed nuclides, Y-90 and Y-86, are to be used to formulate the HuM195 labeled monoclonal antibody, a radiopharmaceutical under active investigation against hematopoietic progenitor cells.

  10. Vapor phase growth of nanostructured yttrium oxysulfide films

    Microsoft Academic Search

    V. V. Bakovets; T. M. Levashova; I. Yu. Filatova; E. A. Maksimovskii; A. E. Kupcha

    2008-01-01

    Nanostructured yttrium oxysulfide films have been prepared via vapor phase growth. The first step was the deposition of 50-nm-thick\\u000a nanostructured yttria films from yttrium dipivaloylmethanate vapor at 525°C. Next, the films were sulfided in ammonium thiocyanate\\u000a vapor at temperatures from 800 to 1100°C. Hexagonal yttrium oxysulfide was obtained at 900°C and higher temperatures. The\\u000a films consisted of densely packed grains

  11. High temperature performances of yttrium-doped spherical nickel hydroxide

    Microsoft Academic Search

    X Mi; X. P Gao; C. Y Jiang; M. M Geng; J Yan; C. R Wan

    2004-01-01

    The regular and yttrium-doped spherical ?-phase nickel hydroxides were synthesized by means of chemically co-precipitation. The yttrium-doping with long needle-like nanocrystallites observed by TEM promoted the formation of the spherical nickel hydroxide with the larger diameter of about 5?m. The discharge capacity of the yttrium-doped spherical nickel hydroxide was measured to be slightly lower than that of the regular spherical

  12. Synthesis of yttrium hydroxide and oxide nanotubes

    Microsoft Academic Search

    Qun Tang; Zhaoping Liu; Shu Li; Shuyuan Zhang; Xianming Liu; Yitai Qian

    2003-01-01

    Yttrium hydroxide nanotubes were hydrothermally synthesized via a metastable precursor, PEG–Y(NO3)3 complex. XRD patterns showed the product was a pure hexagonal phase of Y(OH)3. TEM images displayed that the nanotubes have outer diameters ranging from 80 to 200nm, wall thicknesses of about 30nm, and lengths up to several micrometers. The nanotube growth may have three stages: formation of a metastable

  13. Divalent ytterbium ions in yttrium aluminum garnet and yttrium oxide ceramics

    NASA Astrophysics Data System (ADS)

    Solomonov, V. I.; Orlov, A. N.; Spirina, A. V.; Konev, S. F.; Cholakh, S. O.; Luk'yashin, K. E.

    2014-12-01

    Laser ceramics based on ytterbium-doped yttrium aluminum garnet and yttrium oxide are synthesized. The transmission, pulsed cathodoluminescence, and electron-spin resonance spectra of these ceramics at room temperature are measured and analyzed. It is shown that all the samples contain Yb2+ ions with the 4 f 136 s electronic configuration of the ground state, which manifest themselves in the form of relatively weak bands in the IR region of the optical spectra in addition to the bands of Yb3+ ions.

  14. 88-Inch Cyclotron newsletter

    SciTech Connect

    Stokstad, R.

    1987-02-01

    Activities at the 88-Inch Cyclotron are discussed. Increased beam time demand and operation of the ECR source and cyclotron are reported. Experimental facility improvements are reported, including improvements to the High Energy Resolution Array and to the Recoil Atom Mass Analyzer, a new capture beamline, development of a low background counting facility. Other general improvements are reported that relate to the facility computer network and electronics pool. Approved heavy nuclei research is briefly highlighted. Also listed are the beams accelerated by the cyclotron. (LEW)

  15. Hydrogen trapping by yttrium in low temperature lithium

    NASA Astrophysics Data System (ADS)

    Anantatmula, R. P.; Katsuta, Hiroji

    1984-05-01

    A test to determine the lithium compatibility and impurity gettering capabilities of various materials including yttrium was performed in Beryllium-7 Experimental Lithium Loop (7BELL) at 270°C. Yttrium coupons were exposed in liquid lithium for a total of 3,718 hours. X-ray diffraction and bulk chemical analysis data indicated that yttrium absorbs hydrogen from liquid lithium at 270°C and transforms to yttrium dihydride (YH 2). The transformation of yttrium to YH 2 resulted in embrittlement of the coupons and subsequent fragmentation to small pieces. Additional analysis, based on the equilibrium hydrogen pressures for the transition of yttrium to YH 2, and Sievert's relationship for hydrogen in equilibrium with hydrogen in lithium, indicates that the temperature of yttrium cannot exceed 280°C to control the hydrogen concentration in lithium at below 1 wt ppm. It is concluded in general that yttrium in sponge form is a good getter for removal of hydrogen isotopes from the lithium blanket of a fusion reactor at or below 280°C, which is in excellent agreement with the results of previous authors.

  16. Cerium and yttrium oxide nanoparticles are neuroprotective

    SciTech Connect

    Schubert, David [Salk Institute, 10010 N. Torrey Pines Rd., La Jolla, CA 92037 (United States)]. E-mail: schubert@salk.edu; Dargusch, Richard [Salk Institute, 10010 N. Torrey Pines Rd., La Jolla, CA 92037 (United States); Raitano, Joan [Columbia University, Departments of Applied Physics and Applied Mathematics, 1136 Mudd, MC 4701, New York, NY 10027 (United States); Chan, S.-W. [Columbia University, Departments of Applied Physics and Applied Mathematics, 1136 Mudd, MC 4701, New York, NY 10027 (United States)

    2006-03-31

    The responses of cells exposed to nanoparticles have been studied with regard to toxicity, but very little attention has been paid to the possibility that some types of particles can protect cells from various forms of lethal stress. It is shown here that nanoparticles composed of cerium oxide or yttrium oxide protect nerve cells from oxidative stress and that the neuroprotection is independent of particle size. The ceria and yttria nanoparticles act as direct antioxidants to limit the amount of reactive oxygen species required to kill the cells. It follows that this group of nanoparticles could be used to modulate oxidative stress in biological systems.

  17. Direct laser cooling of yttrium monoxide

    NASA Astrophysics Data System (ADS)

    Hummon, Matthew; Yeo, Mark; Stuhl, Benjamin; Xia, Yong; Ye, Jun

    2012-06-01

    Using a laser system consisting of only three lasers, one for the main cooling transition and two for vibrational repumping, we create a quasi-closed optical cycling transition for the molecule yttrium monoxide (YO) capable of scattering more than one thousand photons. Using this laser system in conjunction with a cryogenic buffer-gas-cooled source we characterize the photon scattering rate by observation of deflection of the YO molecular beam. Additionally, we observe transverse Doppler laser cooling of the YO molecular beam.

  18. (Data in metric tons of yttrium oxide (Y2O3) content unless otherwise noted) Domestic Production and Use: The rare-earth element yttrium was not mined in the United States in 2009. All

    E-print Network

    . Rare-earth metals, scandium and yttrium, whether or not intermixed or interalloyed 2805.30.0000 5.0% ad Production and Use: The rare-earth element yttrium was not mined in the United States in 2009. All yttrium. Other rare-earth compounds, including yttrium oxide >85% Y2O3, yttrium nitrate, and other individual

  19. [Data in metric tons of yttrium oxide (Y2O3) content unless otherwise noted] Domestic Production and Use: The rare-earth element yttrium was not mined in the United States in 2010. All

    E-print Network

    . Rare-earth metals, scandium and yttrium, whether or not intermixed or interalloyed 2805.30.0000 5.0% ad Production and Use: The rare-earth element yttrium was not mined in the United States in 2010. All yttrium. Other rare-earth compounds, including yttrium oxide >85% Y2O3, yttrium nitrate, and other individual

  20. Mechanochemical solid reaction of yttrium oxide with alumina leading to the synthesis of yttrium aluminum garnet

    Microsoft Academic Search

    Qiwu Zhang; Fumio Saito

    2003-01-01

    Dry grinding of Y2O3 and transition aluminas was conducted, using a planetary ball mill under atmospheric conditions, to synthesize yttrium aluminum garnet (Y3Al5O12, YAG). The Y2O3 reacts mechanochemically with the transition aluminas to form YAlO3 and YAG after 120 min of grinding. No reaction occurs when the Y2O3 was ground with hard corundum or soft gibbsite. Grinding the Y2O3 for

  1. Ferroelectricity in yttrium-doped hafnium oxide

    NASA Astrophysics Data System (ADS)

    Müller, J.; Schröder, U.; Böscke, T. S.; Müller, I.; Böttger, U.; Wilde, L.; Sundqvist, J.; Lemberger, M.; Kücher, P.; Mikolajick, T.; Frey, L.

    2011-12-01

    Structural and electrical evidence for a ferroelectric phase in yttrium doped hafnium oxide thin films is presented. A doping series ranging from 2.3 to 12.3 mol% YO1.5 in HfO2 was deposited by a thermal atomic layer deposition process. Grazing incidence X-ray diffraction of the 10 nm thick films revealed an orthorhombic phase close to the stability region of the cubic phase. The potential ferroelectricity of this orthorhombic phase was confirmed by polarization hysteresis measurements on titanium nitride based metal-insulator-metal capacitors. For 5.2 mol% YO1.5 admixture the remanent polarization peaked at 24 ?C/cm2 with a coercive field of about 1.2 MV/cm. Considering the availability of conformal deposition processes and CMOS-compatibility, ferroelectric Y:HfO2 implies high scaling potential for future, ferroelectric memories.

  2. INFRARED TRANSMITTANCE OF CRYSTALLINE YTTRIUM OXIDE AND RELATED COMPOUNDS

    Microsoft Academic Search

    K. A. Wickersheim; R. A. Lefever

    1961-01-01

    Preliminary data are given on the optical and infrared properties of ; yttrium oxide and several related compounds (AlâOâ, MgO, (Y\\/sub 0.9\\/\\/; sub 5\\/La\\/sub 0.0\\/â)âOâ, a nd YbâOâ). The optical ; properties of yttrium oxide in the visible and ultraviolet are found to be ; strongly sensitive to the impurities in the initial powders, the properties in ; the infrared

  3. Manipulation of dopant distribution in yttrium-doped ceria particles.

    PubMed

    Shih, Shao-Ju; Yu, Yan-Jie; Wu, Ying-Ying

    2012-10-01

    Yttrium is one of the most widely used dopants (e.g., in yttrium-doped ceria (YDC) and yttria-stabilized zirconia) for improving performance of solid electrolytes utilized in solid oxide fuel cells. Oxygen ion conductivity is known to be a function of yttrium concentration in the electrolytes and thus it is important to further understand the factors that influence such concentration distribution. In this study, we examine the change in the distribution of yttrium concentration after annealing in YDC particles. The geometry and morphology of YDC particles, synthesized by spray pyrolysis, were characterized using transmission electron microscopy, and the distribution of yttrium was investigated by X-ray energy-dispersive spectroscopy (XEDS) considering electron interaction volume and geometry of the particle in the XEDS profile analysis. In addition, relative concentrations of Ce(lll) ions, which are thought to be proportional to the concentrations of the oxygen vacancies in the YDC particles, were examined using X-ray photoelectron spectroscopy to correlate with yttrium concentration distributions. It was found that in the as-prepared hollow spherical particles the concentration of yttrium increases linearly from the inner surface towards the outer surface. After annealing the distribution of yttrium becomes non-linear and the dopant is found to migrate to the inner and outer surfaces of the particle. The decrease of the concentration of Ce(lll) ions upon annealing followed by the formation of the dopant concentration gradient is likely due to the increase of the size of the crystallites in the particles. PMID:23421163

  4. [Monoclonal antibodies specific for K88ab, K88ac and K88ad antigens of Escherichia coli].

    PubMed

    Li, Y; Liu, X F

    1989-10-01

    A panel of twelve hybridoma cell lines, secreting specific antibodies to K88 adhesin antigens of enterotoxigenic Escherichia coli (ETEC) were established from eight separate fusions between mouse myeloma cell line Sp 2/0-Ag-14 and spleen cells from mice immunized with purified K88 antigens. Among the 12 monoclonal antibodies (MCA), K-A, K-35, K-11, and K-15 were K88a specific and reacted with all K88 adhesin bearing Escherichia coli strains tested, whatever K88ab, K88ac or K88ad they might be, as shown either in enzyme-linked immunosorbent assay (ELISA) or in direct agglutination test, whereas K32, K-4, and K-3 were specific for G88ab, K88ac, and K88ad respectively. The antigen patterns of 33 K88 bearing Escherichia coli strains covering 3 serotypes of K88ab, K88ac, and K88ad were analyzed by the use of these MCAs. The preliminary results showed that all Escherichia strains with the same serotype of K88 antigen shared at least one common type-specific antigenic determinant, that K88ad and K88ac strains enjoyed one common antigenic determinant that did not exist on K88ab strains, and that there were a few K88 antigenic determinants that appeared only on limited Escherichia coli strains of the same K88 serotype. PMID:2573972

  5. Neodymium-doped laser yttrium oxide ceramics

    SciTech Connect

    Bagaev, S N; Vatnik, S M; Vedin, I A; Maiorov, A P; Pestryakov, E V [Institute of Laser Physics, Siberian Branch, Russian Academy of Sciences, Novosibirsk (Russian Federation); Osipov, V V; Ivanov, M G; Solomonov, V I; Platonov, V V; Orlov, A N; Rasuleva, A V; Ivanov, V V; Kaigorodov, A S; Khrustov, V R [Institute of Electrophysics, Ural Branch of the Russian Academy of Sciences, Ekaterinburg (Russian Federation); Shestakov, A V [ELS-94 Limited Liability Company, Research and Production Center, Moscow (Russian Federation); Salkov, A V [Elakom Limited Liability Company, Moscow (Russian Federation)

    2008-09-30

    We studied mechanical, optical, and lasing parameters of neodymium-doped yttrium oxide ceramics synthesised by using a new technology involving the laser synthesis of nanopowders and their magnetic pulsed compaction. The fracture toughness of ceramics to cracks and its microhardness were measured to be K{sub IC} = 0.9-1.4 MPa m{sup 1/2} and H{sub {nu}} = 11.8 GPa, respectively. Ceramic samples sintered in the temperature range from 1550 to 2050{sup 0}C have the porosity (1-150)x10{sup -4}% and the optical loss coefficient {alpha}{sub 1.07} = 0.03-2.1 cm{sup -1} at a wavelength of 1.07 {mu}m. It is shown that such porosity does not affect the optical loss coefficient of light. Lasing at {approx}1.079 {mu}m with a slope efficiency of 15% was obtained in a 1.1-mm-thick sample pumped by laser diodes. (active media. lasers)

  6. 7 CFR 945.88 - Derogation.

    Code of Federal Regulations, 2010 CFR

    2010-01-01

    ...2010-01-01 2010-01-01 false Derogation. 945.88 Section 945.88...Miscellaneous Provisions § 945.88 Derogation. Nothing contained in this...shall be construed to be, in derogation or in modification of the...

  7. Thermoluminescent and optical absorption properties of neodymium doped yttrium aluminoborate and yttrium calcium borate glasses

    NASA Astrophysics Data System (ADS)

    Yoshimura, E. M.; Santos, C. N.; Ibanez, A.; Hernandes, A. C.

    2009-04-01

    Neodymium doped yttrium aluminoborate and yttrium calcium borate glasses were prepared by the conventional melting-quenching technique with neodymium concentration varying from 0.10 to 1.0 mol%. The obtained glasses present a wide transparency in the UV-visible region (till 240 nm). The thermoluminescent (TL) emission of beta-irradiated samples was measured, showing a broad peak at ˜240 °C with intensities related to the Nd 3+ content, for both glasses. Calcium borate glass samples are about one order of magnitude less luminescent than the aluminoborate glasses. Probably the presence of Ca 2+, instead of Al 3+ and Y 3+ in the matrix, inhibits the production of the intrinsic hole centers, connected to boron and oxygen, known in the literature to act as luminescent centers in TL emission of borate glasses. We suggest that Nd 3+ ions act as electron trapping centers in both glass matrices, as they modify the temperature of emission and the light intensity. Also, the Nd:YAlB glass can be used as a dosimeter in various applications, including radiotherapy, but the sensitivity of this material to neutron should be checked.

  8. Hickey, TT162, Casts 88-92 Hickey, TT162, Casts 88-92, page 1

    E-print Network

    Hickey, Barbara

    Hickey, TT162, Casts 88-92 Hickey, TT162, Casts 88-92, page 1 CTD088 #12;Hickey, TT162, Casts 88-92 Hickey, TT162, Casts 88-92, page 2 CTD088 #12;Hickey, TT162, Casts 88-92 Hickey, TT162, Casts 88-92, page 3 CTD088 #12;Hickey, TT162, Casts 88-92 Hickey, TT162, Casts 88-92, page 4 CTD088 #12;Hickey, TT162

  9. 40 CFR 721.10177 - Phosphoric acid, yttrium(3+) salt (1:1).

    Code of Federal Regulations, 2010 CFR

    2010-07-01

    ...false Phosphoric acid, yttrium(3+) salt (1:1). 721.10177 Section 721...10177 Phosphoric acid, yttrium(3+) salt (1:1). (a) Chemical substance...identified as phosphoric acid, yttrium(3+) salt (1:1) (PMN P-04-153; CAS...

  10. 40 CFR 721.10177 - Phosphoric acid, yttrium(3+) salt (1:1).

    Code of Federal Regulations, 2011 CFR

    2011-07-01

    ...false Phosphoric acid, yttrium(3+) salt (1:1). 721.10177 Section 721...10177 Phosphoric acid, yttrium(3+) salt (1:1). (a) Chemical substance...identified as phosphoric acid, yttrium(3+) salt (1:1) (PMN P-04-153; CAS...

  11. Synthesis and characterization of nanocrystalline yttrium oxide prepared with tetraalkylammonium hydroxides

    Microsoft Academic Search

    Mark D. Fokema; Eugene Chiu; Jackie Y. Ying

    2000-01-01

    Controlled chemical precipitation of yttrium hydroxynitrate has been used to synthesize nanocrystalline yttrium oxide powders with high thermal stability. The type of base employed as the precipitating agent has a significant effect on the properties of the yttrium oxide product. Precipitation with tetraalkylammonium hydroxides was shown to produce a much finer-grained product than a conventional ammonium hydroxide synthesis route. This

  12. Defect Chemistry of Yttrium-Doped Barium Zirconate: A Thermodynamic Analysis of Water Uptake

    E-print Network

    Defect Chemistry of Yttrium-Doped Barium Zirconate: A Thermodynamic Analysis of Water Uptake-based SOFCs.3 Of known proton conducting oxides, yttrium-doped barium zirconate (BYZ) is particularly mobile species. Doping with trivalent yttrium onto the tetravalent zirconium in barium zirconate

  13. Yttrium and rare earth stabilized fast reactor metal fuel

    DOEpatents

    Guon, Jerold (Woodland Hills, CA); Grantham, LeRoy F. (Calabasas, CA); Specht, Eugene R. (Simi Valley, CA)

    1992-01-01

    To increase the operating temperature of a reactor, the melting point and mechanical properties of the fuel must be increased. For an actinide-rich fuel, yttrium, lanthanum and/or rare earth elements can be added, as stabilizers, to uranium and plutonium and/or a mixture of other actinides to raise the melting point of the fuel and improve its mechanical properties. Since only about 1% of the actinide fuel may be yttrium, lanthanum, or a rare earth element, the neutron penalty is low, the reactor core size can be reduced, the fuel can be burned efficiently, reprocessing requirements are reduced, and the nuclear waste disposal volumes reduced. A further advantage occurs when yttrium, lanthanum, and/or other rare earth elements are exposed to radiation in a reactor, they produce only short half life radioisotopes, which reduce nuclear waste disposal problems through much shorter assured-isolation requirements.

  14. Thermochromism in yttrium iron garnet compounds.

    PubMed

    Serier-Brault, Hélène; Thibault, Lucile; Legrain, Magalie; Deniard, Philippe; Rocquefelte, Xavier; Leone, Philippe; Perillon, Jean-Luc; Le Bris, Stéphanie; Waku, Jean; Jobic, Stéphane

    2014-12-01

    Polycrystalline yttrium iron garnet (Y3Fe5O12, hereafter labeled YIG) has been synthesized by solid-state reaction, characterized by X-ray diffraction, Mössbauer spectroscopy, and UV-vis-NIR diffuse reflectance spectroscopy, and its optical properties from room temperature (RT) to 300 °C are discussed. Namely, its greenish color at RT is assigned to an O(2-) ? Fe(3+) ligand-to-metal charge transfer at 2.57 eV coupled with d-d transitions peaking at 1.35 and 2.04 eV. When the temperature is raised, YIG displays a marked thermochromic effect; i.e., the color changes continuously from greenish to brownish, which offers opportunities for potential application as a temperature indicator for everyday uses. The origin of the observed thermochromism is assigned to a gradual red shift of the ligand-to-metal charge transfer with temperature while the positioning in energy of the d-d transitions is almost unaltered. Attempts to achieve more saturated colors via doping (e.g., Al(3+), Ga(3+), Mn(3+), ...) remained unsuccessful except for chromium. Indeed, Y3Fe5O12:Cr samples exhibit at RT the same color than the undoped garnet at 200 °C. The introduction of Cr(3+) ions strongly impacts the color of the Y3Fe5O12 parent either by an inductive effect or, more probably, by a direct effect on the electronic structure of the undoped material with formation of a midgap state. PMID:25382733

  15. Deposition of yttrium oxide thin films in supercritical carbon dioxide

    Microsoft Academic Search

    Theodosia Gougousi; Zhiying Chen

    2008-01-01

    A synthetic avenue for the formation of yttrium oxide thin films on Si native oxide surfaces is demonstrated by the reaction of Tris(2,2,6,6-tetramethyl-3,5-heptanedionato) yttrium(III) with inorganic (H2O2) and organic (tert-butyl and di-tert-amyl) peroxides in supercritical carbon dioxide. The reactions are carried out in a hot wall reactor at temperatures below 130 °C and pressures ranging from 13.10 to 22.75 MPa. Spectroscopic Ellipsometry

  16. Solid solubilities of oxygen, carbon, and nitrogen in yttrium

    Microsoft Academic Search

    O. N. Carlson; R. R. Lichtenberg; J. C. Warner

    1974-01-01

    The solid solubilities were investigated and a partial diagram is ; proposed for the Y --YN system. The temperature dependence of the solubility of ; each solute in alpha yttrium was fitted empirically to Arrhenius-type ; equations, and the heats of solution for the coexisting oxide, carbide, or ; nitride phase were found to be 6.8 plus or minus 0.4,

  17. Molecular dynamics simulations of yttrium-stabilized zirconia

    Microsoft Academic Search

    Xiaoyun Li; B. Hafskjold

    1995-01-01

    The electric conductivity of yttrium-stabilized zirconia exhibits a maximum as a function of dopant (Y3+) cation concentration in isothermal and isobaric conditions. In order to improve the conductivity of this important solid electrolyte, it is essential to understand the ion transport mechanisms at the molecular level. This was investigated by the molecular dynamics simulations method in the present study. The

  18. The influence of yttrium on oxide scale growth and adherence

    Microsoft Academic Search

    T. A. Ramanarayanan; R. Ayer; R. Petkovic-Luton; D. P. Leta

    1988-01-01

    Alloys and coatings for high-temperature service are designed to form selectively chromia scales, alumina scales, or, to a limited extent, silica scales upon exposure to the environment. For such oxide scales to be protective, they should be both slow growing and adherent. It turns out that the addition of yttrium to such alloys can often impart both characteristics to the

  19. Measurement of the Optical Constants of Yttrium Oxide

    Microsoft Academic Search

    Yutaka Nigara

    1968-01-01

    By using a solar furnace, yttrium oxide crystals were grown by the fusion process. The crystals obtained were highly transparent in the spectral region from 0.25 to 9.6 mu. The refractive index in this region was measured by three different methods. The observed index values were well expressed by the dispersion formula. From the values of parameters in the formula,

  20. Band gap closure in yttrium hydride under high pressure

    NASA Astrophysics Data System (ADS)

    Machida, Akihiko; Nakano, Satoshi

    2005-03-01

    Trivalent rare-earth metals demonstrate spectacular change in electronic properties by hydrogenation. With increase in hydrogen concentration beyond x ˜2.7, yttrium hydride, YHx, shows metal-insulator phase transition with structural change from the fcc to hcp of yttrium metal lattice. Band gap opening due to orbital hybridization between 1s (H) and 4d (Y) has theoretically been proposed for the metal- insulator transition. Theoretical studies have also predicted that the volume reduction by applying hydrostatic pressure would lead to metallization in association with band gap closure. We have investigated structural properties of yttrium hydrides by means of x-ray diffraction and infrared absorption beyond a predicted metallization pressure of ˜18 GPa. Hydride specimen was prepared by hydrogenation reaction of yttrium powder or foil with liquid hydrogen in a diamond anvil cell at room temperature. With increase in pressure beyond ˜10 GPa, the hcp lattice of YH3 transforms gradually to a fcc structure. Infrared spectra show peak position change in the hydrogen vibrational region of 450-1500 cm-1 above ˜11 GPa, corresponding to the x-ray diffraction results. The H-Y bonding state and expected metallization are discussed on the basis of the high pressure experimental results obtained x-ray diffraction and infrared absorption.

  1. Ionic Conductivity of Yttrium Fluoride and Lutetium Fluoride

    Microsoft Academic Search

    M. O'Keeffe

    1973-01-01

    At the transitions from the low-temperature orthorhombic forms of lutetium fluoride and yttrium fluoride to the high-temperature hexagonal forms, there are increases of several orders of magnitude in the ionic conductivities. In the high-temperature phases the conductivities are comparable to those of typical ionic melts. These fluoride compounds are therefore solid electrolytes.

  2. Ionic conductivity of yttrium fluoride and lutetium fluoride.

    PubMed

    O'keeffe, M

    1973-06-22

    At the transitions from the low-temperature orthorhombic forms of lutetium fluoride and yttrium fluoride to the high-temperature hexagonal forms, there are increases of several orders of magnitude in the ionic conductivities. In the high-temperature phases the conductivities are comparable to those of typical ionic melts. These fluoride compounds are therefore solid electrolytes. PMID:17759121

  3. (Data in metric tons of yttrium oxide (Y2O3) content unless otherwise noted) Domestic Production and Use: The rare-earth element yttrium was not mined in the United States in 2004. Yttrium

    E-print Network

    Relations 12-31-04 Thorium ores and concentrates (monazite) 2612.20.0000 Free. Rare-earth metals, scandium Production and Use: The rare-earth element yttrium was not mined in the United States in 2004. Yttrium and compounds containing by weight >19% to rare-earth compounds, including

  4. Evidence of yttrium silicate inclusions in YSZ-porcelain veneers.

    PubMed

    Stoner, Brian R; Griggs, Jason A; Neidigh, John; Piascik, Jeffrey R

    2014-04-01

    This report introduces the discovery of crystalline defects that can form in the porcelain veneering layer when in contact with yttria-stabilized zirconia (YSZ). The focus was on dental prostheses and understanding the defects that form in the YSZ/porcelain system; however the data reported herein may have broader implications toward the use and stability of YSZ-based ceramics in general. Specimens were cut from fully sintered YSZ plates and veneering porcelain was applied (<1 mm thick) to one surface and fired under manufacturer's recommended protocol. Scanning electron microscopy (SEM) with integrated electron dispersive X-ray (EDAX) was used for microstructural and elemental analysis. EDAX, for chemical analysis and transmission electron diffraction (TED) for structural analysis were both performed in the transmission electron microscope (TEM). Additionally, in order to spatially resolve Y-rich precipitates, micro-CT scans were conducted at varying depths within the porcelain veneer. Local EDAX (SEM) was performed in the regions of visible inclusions and showed significant increases in yttrium concentration. TEM specimens also showed apparent inclusions in the porcelain and selected area electron diffraction was performed on these regions and found the inclusions to be crystalline and identified as either yttrium-silicate (Y2 SiO5 ) or yttrium-disilicate (Y2 Si2 O7 ). Micro-CT data showed that yttrium-silicate precipitates were distributed throughout the thickness of the porcelain veneer. Future studies are needed to determine whether many of the premature failures associated with this materials system may be the result of crystalline flaws that form as a result of high temperature yttrium diffusion near the surfaces of YSZ. PMID:24106151

  5. Advances in SPECT for Optimizing the Liver Tumors Radioembolization Using Yttrium-90 Microspheres.

    PubMed

    Roshan, Hoda Rezaei; Azarm, Ahmadreza; Mahmoudian, Babak; Islamian, Jalil Pirayesh

    2015-01-01

    Radioembolization (RE) with Yttrium-90 ((90)Y) microspheres is an effective treatment for unresectable liver tumors. The activity of the microspheres to be administered should be calculated based on the type of microspheres. Technetium-99m macroaggregated albumin ((99m)Tc-MAA) single photon emission computed tomography/computed tomography (SPECT/CT) is a reliable assessment before RE to ensure the safe delivery of microspheres into the target. (90)Y bremsstrahlung SPECT imaging as a posttherapeutic assessment approach enables the reliable determination of absorbed dose, which is indispensable for the verification of treatment efficacy. This article intends to provide a review of the methods of optimizing (90)Y bremsstrahlung SPECT imaging to improve the treatment efficacy of liver tumor RE using (90)Y microspheres. PMID:26097416

  6. 49 CFR 393.88 - Television receivers.

    Code of Federal Regulations, 2012 CFR

    2012-10-01

    ...2012-10-01 2012-10-01 false Television receivers. 393.88 Section 393...Parts and Accessories § 393.88 Television receivers. Any motor vehicle equipped with a television viewer, screen or other means of...

  7. 49 CFR 393.88 - Television receivers.

    Code of Federal Regulations, 2013 CFR

    2013-10-01

    ...2013-10-01 2013-10-01 false Television receivers. 393.88 Section 393...Parts and Accessories § 393.88 Television receivers. Any motor vehicle equipped with a television viewer, screen or other means of...

  8. 49 CFR 393.88 - Television receivers.

    Code of Federal Regulations, 2014 CFR

    2014-10-01

    ...2014-10-01 2014-10-01 false Television receivers. 393.88 Section 393...Parts and Accessories § 393.88 Television receivers. Any motor vehicle equipped with a television viewer, screen or other means of...

  9. STS-88 Day 06 Highlights

    NASA Technical Reports Server (NTRS)

    1998-01-01

    On this sixth day of the STS-88 mission, the flight crew, Commander Robert D. Cabana, Pilot Frederick W. Sturckow, and Mission Specialists Nancy J. Currie, James H. Newman, Jerry L. Ross, and Sergei Krikalev are awakened by Dwight Yokum's "Streets of Bakersfield," requested by the wife of Pilot Rick Sturckow, a California native. Cabana and Sturckow fire Endeavour's primary reaction control jets to raise the altitude of the International Space Station by about 5-1/2 statute miles. Later on Cabana, Sturckow and Currie are interviewed by the ABC News/Discovery Channel and MSNBC.

  10. 47 CFR 73.88 - Blanketing interference.

    Code of Federal Regulations, 2013 CFR

    2013-10-01

    ...2013-10-01 false Blanketing interference. 73.88 Section 73.88 Telecommunication...Broadcast Stations § 73.88 Blanketing interference. The licensee of each broadcast...reasonable complaints of blanketing interference within the 1 V/m contour....

  11. 47 CFR 73.88 - Blanketing interference.

    Code of Federal Regulations, 2010 CFR

    2010-10-01

    ...2010-10-01 false Blanketing interference. 73.88 Section 73.88 Telecommunication...Broadcast Stations § 73.88 Blanketing interference. The licensee of each broadcast...reasonable complaints of blanketing interference within the 1 V/m contour....

  12. 47 CFR 73.88 - Blanketing interference.

    Code of Federal Regulations, 2014 CFR

    2014-10-01

    ...2014-10-01 false Blanketing interference. 73.88 Section 73.88 Telecommunication...Broadcast Stations § 73.88 Blanketing interference. The licensee of each broadcast...reasonable complaints of blanketing interference within the 1 V/m contour....

  13. 47 CFR 73.88 - Blanketing interference.

    Code of Federal Regulations, 2011 CFR

    2011-10-01

    ...2011-10-01 false Blanketing interference. 73.88 Section 73.88 Telecommunication...Broadcast Stations § 73.88 Blanketing interference. The licensee of each broadcast...reasonable complaints of blanketing interference within the 1 V/m contour....

  14. 47 CFR 73.88 - Blanketing interference.

    Code of Federal Regulations, 2012 CFR

    2012-10-01

    ...2012-10-01 false Blanketing interference. 73.88 Section 73.88 Telecommunication...Broadcast Stations § 73.88 Blanketing interference. The licensee of each broadcast...reasonable complaints of blanketing interference within the 1 V/m contour....

  15. 24 CFR 200.88 - Late charge.

    Code of Federal Regulations, 2010 CFR

    2010-04-01

    ...2010-04-01 2010-04-01 false Late charge. 200.88 Section 200.88...Projects Mortgage Provisions § 200.88 Late charge. The mortgage may provide for the collection by the mortgagee of a late charge in accordance with terms,...

  16. 9 CFR 381.88 - Parasites.

    Code of Federal Regulations, 2012 CFR

    2012-01-01

    ...2012-01-01 2012-01-01 false Parasites. 381.88 Section 381.88...Carcasses and Parts § 381.88 Parasites. Organs or other parts of carcasses...which are found to be infested with parasites, or which show lesions of such...

  17. 9 CFR 381.88 - Parasites.

    Code of Federal Regulations, 2014 CFR

    2014-01-01

    ...2014-01-01 2014-01-01 false Parasites. 381.88 Section 381.88...Carcasses and Parts § 381.88 Parasites. Organs or other parts of carcasses...which are found to be infested with parasites, or which show lesions of such...

  18. 9 CFR 381.88 - Parasites.

    Code of Federal Regulations, 2013 CFR

    2013-01-01

    ...2013-01-01 2013-01-01 false Parasites. 381.88 Section 381.88...Carcasses and Parts § 381.88 Parasites. Organs or other parts of carcasses...which are found to be infested with parasites, or which show lesions of such...

  19. 7 CFR 930.88 - Derogation.

    Code of Federal Regulations, 2010 CFR

    2010-01-01

    ...2010-01-01 2010-01-01 false Derogation. 930.88 Section 930.88...Miscellaneous Provisions § 930.88 Derogation. Nothing contained in this...or shall be construed to be, in derogation or in modification of the...

  20. Optical properties of Dy3+ doped yttrium aluminium borate

    Microsoft Academic Search

    R. Martínez Vázquez; R. Osellame; M. Marangoni; R. Ramponi; E. Diéguez; M. Ferrari; M. Mattarelli

    2004-01-01

    A Dy3+ doped yttrium-aluminium borate (Dy:YAB) crystal has been optically characterized. The refractive indices at seven different wavelengths, ranging from the visible to the near infrared (IR), have been measured and the Sellmeier curves have been calculated. The polarized optical absorption spectra have been obtained at room temperature, and the Judd-Ofelt parameters have been calculated. The lifetime of the upper

  1. Thermal Decomposition of Lanthanide, Yttrium, and Scandium Oxalates and Carbonates

    NASA Astrophysics Data System (ADS)

    Sharov, Vyacheslav A.; Bezdenezhnykh, G. V.

    1981-07-01

    Data concerning the thermal decomposition of lanthanide, yttrium, and scandium oxalates and carbonates are surveyed. The complexity of the process, the large number of stages involved, and the dependence of the composition of the intermediates in the thermal transformations on the experimental conditions is noted. Certain process characteristics have been discovered and it is concluded that the decomposition process depends on the ionic radius of the metal. The bibliography includes 83 references.

  2. Trivalent zirconium and hafnium ions in yttrium oxide ceramics

    NASA Astrophysics Data System (ADS)

    Solomonov, V. I.; Spirina, A. V.; Konev, S. F.; Cholakh, S. O.

    2014-05-01

    An analysis of the electron spin resonance (ESR) spectrum of transparent ceramics composed of yttrium oxide with zirconium and hafnium additives has revealed the presence of signals (with similar parameters) from Zr3+ and Hf3+ ions, which have a similar electron configurations of the ground states: [Kr]4 d 1 and [Xe]5 d 1, respectively. It is shown that the pulsed cathodoluminescence spectra of these ions consist of two bands peaking at ? ? 818 and 900 nm.

  3. Formation of alkoxy-derived yttrium aluminium oxides

    Microsoft Academic Search

    O. Yamaguchi; K. Takeoka; K. Hirota; H. Takano; A. Hayashida

    1992-01-01

    Monoclinic Y4Al2O9 and hexagonal YAlO3 crystallize at low temperatures from amorphous materials prepared by the hydrolysis of yttrium and aluminium double alkoxides. Hexagonal YAlO3 transforms to the cubic phase with a garnet structure as an intermediate product at elevated temperatures. The formation process of YAlO3 is described. Solid solutions of hexagonal YAlO3 crystallize between 50 and 62.5 mol % Al2O3.

  4. Solvothermal method to obtain europium-doped yttrium oxide

    Microsoft Academic Search

    Marian Rosaly Davolos; Sergio Feliciano; Ana M. Pires; Rodrigo F. C. Marques; Miguel Jafelicci

    2003-01-01

    Pure yttrium oxide or mixed with europium oxide (3at%) were treated in supercritical isopropanolic suspension at 500°C for 20h and filling degree of 50%. Products were supercritically dried and characterized by scanning electron microscopy (SEM), X-ray powder diffraction (XRD), infrared spectroscopy (IR) and luminescence spectroscopy (LS). Particle shape is irregular with an equivalent diameter of ca. 5?m. Cubic crystalline phase

  5. Mechanochemical synthesis of an yttrium based metal-organic framework.

    PubMed

    Singh, Niraj K; Hardi, Meenakshi; Balema, Viktor P

    2013-02-01

    For the first time a metal hydride has been used for the preparation of a metal-organic framework. MIL-78 has been synthesized by the solid-state mechanochemical reaction between yttrium hydride and trimesic acid. The process does not involve solvents and does not generate liquid by-products, thus proving the viability of the solid-state approach to the synthesis of MOFs. PMID:23128845

  6. Synthesis of Yttrium Oxide Nanocrystal via Solvothermal Process

    Microsoft Academic Search

    Guo Huang; Hong Zhanglian; Zhang Shizhu; Zhang Pengyue; Fan Xianping

    2006-01-01

    Y2O3 nanomaterials have been widely used in transparent ceramics and luminescent devices. Recently there are many studies focusing on controlling the size and morphology of Y2O3 in order to obtain better materials performance. In present study, yttrium oxyhydroxide precursor was synthesized via a facile solvothermal process through the dissolution-recrystallization mechanism of Y2O3 raw powders in the ethylenediamine solvent, then nanosized

  7. Direct measurements of grain boundary sliding in yttrium-doped alumina bicrystals

    NASA Astrophysics Data System (ADS)

    Matsunaga, K.; Nishimura, H.; Muto, H.; Yamamoto, T.; Ikuhara, Y.

    2003-02-01

    The behavior of grain boundary sliding in pure and yttrium-doped Al2O3 was directly measured at a high temperature, using bicrystal experiments. For this purpose, we fabricated Al2O3 bicrystals containing a random grain boundary with or without yttrium ions. High-resolution transmission electron microscopy observations and energy dispersive x-ray spectroscopy analyses showed that bicrystals were successfully joined at an atomic scale, and doped yttrium ions segregated along the grain boundaries. It was found by compressive creep tests that the grain boundary sliding rate was restrained by two orders of magnitude due to yttrium addition, as compared to that of undoped bicrystals.

  8. Yttrium and lanthanum hydride films with switchable optical properties

    NASA Astrophysics Data System (ADS)

    Huiberts, J. N.; Griessen, R.; Rector, J. H.; Wijngaarden, R. J.; Dekker, J. P.; de Groot, D. G.; Koeman, N. J.

    1996-03-01

    IN many substances, changes in chemical composition, pressure or temperature can induce metal-to-insulator transitions1. Although dramatic changes in optical and electrical properties accompany such transitions, their interpretation is often complicated by attendant changes in crystallographic structure2. Yttrium, lanthanum and the trivalent rare-earth elements form hydrides that also exhibit metal-insulator transitions3-5, but the extreme reactivity and fragility of these materials hinder experimental studies5,6. To overcome these difficulties, we have coated thin films of yttrium and lanthanum with a layer of palladium through which hydrogen can diffuse. Real-time transitions from metallic (YH2 or LaH2) to semiconducting (YH3 or LaH3) behaviour occur in these films during continuous absorption of hydrogen, accompanied by pronounced changes in their optical properties. Although the timescale on which this transition occurs is at present rather slow (a few seconds), there appears to be considerable scope for improvement through the choice of rare-earth element and by adopting electrochemical means for driving the transition. In view of the spectacular changes in optical properties-yttrium hydride, for example, changes from a shiny mirror to a yellow, transparent window-metal hydrides might find important technological applications.

  9. Radioimmunotherapy for non-Hodgkin's lymphoma with yttrium 90 ibritumomab tiuxetan.

    PubMed

    Hendrix, Carolyn S; de Leon, Cristina; Dillman, Robert O

    2002-01-01

    The increasing incidence of non-Hodgkin's lymphoma (NHL), coupled with the lack of optimal treatment options, has prompted the development of novel treatments. Of these, radioimmunotherapy is one of the most promising. Two of the radiolabeled monoclonal antibody therapies being studied in the treatment of NHL are yttrium 90 (90Y) ibritumomab tiuxetan and iodine 131 (131I) tositumomab. The radionuclides 90Y and 131I emit beta radiation; 131I also emits gamma radiation, thus requiring more elaborate precautionary measures to limit radiation exposure. The monoclonal antibody portions of the drugs target the CD20 surface antigen that is present on the majority of B-cell lymphomas, resulting in direct radiation to the targeted cells, as well as indirect targeting of adjacent cells (known as the crossfire effect). Clinical trials of 90Y ibritumomab tiuxetan in patients with NHL have produced promising results. The safe and effective use of radioimmunotherapy requires a multidisciplinary team approach in which nurses play a central role. PMID:11998607

  10. H2 oxidation on doped yttrium chromites/yttrium stabilized zirconia anode of solid oxide fuel cell

    NASA Astrophysics Data System (ADS)

    Li, Wenyuan; Gong, Mingyang; Liu, Xingbo

    2013-11-01

    Co and Ni doped yttrium chromites as potential anodes for solid oxide fuel cell (SOFC) are studied with respect to the electrode performance and anode reaction mechanisms. Both electrical conductivity and electrode performance of yttrium chromites have been enhanced after Co and Ni doping. Electrochemical impedance spectroscopy (EIS) results indicate that charge transfer process at high frequency and surface adsorption/diffusion processes at low frequency domain can be the dominant anode reaction steps. Ni doping accelerates the surface processes by reducing the related activation energy from 1.2 to 0.5 eV. It also substantially improves the charge transfer process probably by increasing the amount of adsorbed H on electrode surface. The resistance of high frequency is found to be dependent on H2 content. The observed reaction order is 1/4 for Co doped and 1/3-1/2 for Ni doped yttrium chromites. A model of H2 oxidation reaction is proposed, revealing this dependence stems from the reaction between adsorbed H and the lattice oxygen.

  11. (Data in metric tons of yttrium oxide (Y2O3) content unless otherwise noted) Domestic Production and Use: The rare-earth element yttrium was not mined in the United States in 2005. All

    E-print Network

    -31-05 Thorium ores and concentrates (monazite) 2612.20.0000 Free. Rare-earth metals, scandium and yttrium Production and Use: The rare-earth element yttrium was not mined in the United States in 2005. All yttrium and compounds containing by weight >19% to rare-earth compounds, including

  12. (Data in metric tons of yttrium oxide (Y2O3) content unless otherwise noted) Domestic Production and Use: The rare-earth element yttrium was not mined in the United States in 2006. All

    E-print Network

    -31-06 Thorium ores and concentrates (monazite) 2612.20.0000 Free. Rare-earth metals, scandium and yttrium Production and Use: The rare-earth element yttrium was not mined in the United States in 2006. All yttrium and compounds containing by weight >19% to rare-earth compounds, including

  13. EXTRACTION AND SEPARATION OF YTTRIUM AND RARE-EARTH ELEMENTS FOUND IN EUXENITE

    Microsoft Academic Search

    Gruzensky

    1960-01-01

    Studies relative to the separation of yttrium and the individual rare-; earth elements (lanthanons) from mixtures in which they occur was undertaken at ; the Federal Bureau of Mines Albany Metallurgy Research Center and resuited in the ; development of a solvent extraction method by which yttrium can be separated from ; the rare-earth metals. A separation factor of l0.93

  14. Structural and photoluminescent characteristics of yttrium–aluminum oxide films doped with Tb, Eu or Ce

    Microsoft Academic Search

    A. Esparza; M Garcia; C Falcony

    1998-01-01

    The structural and room temperature luminescent characteristics of rare earth doped yttrium–aluminum oxide films deposited by the spray pyrolysis technique at low temperatures have been studied as a function of the deposition parameters such as substrate temperature and dopant concentration. The spraying solution is prepared by mixing yttrium and aluminum chlorides in water, and the incorporation of the rare earth

  15. Processing of yttrium-doped barium zirconate for high proton conductivity

    E-print Network

    Processing of yttrium-doped barium zirconate for high proton conductivity Peter Babilo Materials the transport properties of yttrium-doped barium zirconate (BYZ) have been explored, with the aim of attaining. INTRODUCTION Doped perovskites, such as barium cerate (BaCeO3), strontium cerate (SrCeO3), and barium zirconate

  16. Cation non-stoichiometry in yttrium-doped barium zirconate: phase behavior, microstructure, and proton conductivity

    E-print Network

    Cation non-stoichiometry in yttrium-doped barium zirconate: phase behavior, microstructure as the predominant secondary phase and the barium zirconate reverting to an undoped composition. From the relative conductivity. Barium zirconate, specifically yttrium-doped BaZrO3, has attracted particular attention amongst

  17. 7 CFR 982.88 - Amendments.

    Code of Federal Regulations, 2010 CFR

    2010-01-01

    ...AGRICULTURAL MARKETING SERVICE (Marketing Agreements and Orders; Fruits, Vegetables, Nuts), DEPARTMENT OF AGRICULTURE HAZELNUTS GROWN IN OREGON AND WASHINGTON Order Regulating Handling Miscellaneous Provisions § 982.88 Amendments....

  18. RBS and GAXRD contributions to yttrium implanted extra low carbon steel characterization

    SciTech Connect

    Caudron, E.; Buscail, H. [Equipe Locale Univ. Blaise Pascal Clermont-Fd II, Le Puy en Velay (France). Lab. Vellave d`Elaboration et d`Etude des Materiaux] [Equipe Locale Univ. Blaise Pascal Clermont-Fd II, Le Puy en Velay (France). Lab. Vellave d`Elaboration et d`Etude des Materiaux; Jacob, Y.P.; Stroosnijder, M.F. [European Commission, Ispra (Italy). Inst. for Advanced Materials] [European Commission, Ispra (Italy). Inst. for Advanced Materials

    1999-02-01

    Extra low carbon steel samples were yttrium implanted using an ion implantation method. Composition and structural studies were carried out before and after yttrium implantations by several analytical and structural techniques (Rutherford backscattering spectrometry, reflection high energy electron diffraction, scanning electron microscopy, X-ray diffraction, and glancing angle X-ray diffraction) to characterize the yttrium implantation effect on extra low carbon steel. The aim of this article is to show the contributions of Rutherford back-scattering spectrometry (RBS) and glancing angle X-ray diffraction (GAXRD) to the determination of yttrium depth profiles in the samples. The results obtained by these techniques are compared to those of the other analyses performed in this work to show the existing correlation between composition and structural studies. Their results allow a better understanding of the effect of yttrium implantation in extra low carbon steel before studying their corrosion resistance at high temperature.

  19. [Hygienic regulation of yttrium, terbium, ytterbium and lutetium fluorides in the air of the workplace].

    PubMed

    Neizvestnova, E M; Grekhova, T D; Privalova, L I; Babakova, O M; Konovalova, N E; Petelina, E V

    1994-01-01

    The study (experiments on animals and on culture of rats' peritoneal macrophages) covered fluorides of rare-earth metals (REM) assigned to yttrium group--yttrium, terbium, ytterbium, lutetium. Fluorides of REM have low toxicity and cumulativity, induce no local irritation of skin and eyes. Fluorides of yttrium, terbium and lutetium, if administered into stomach, result in specific intoxication (fluorosis). Fluoride of ytterbium did not cause such intoxication. According to short-term tests of cytotoxicity, the foreseeable fibrogenic danger for ytterbium fluoride is moderate, for fluorides of yttrium, terbium and lutetium is mild. The authors recommend to control the level of yttrium, terbium and lutetium fluorides in the air of workplace through the MACs for the fluorides at 2.5 mg/cu m (maximal single concentration) and 0.5 mg/cu m (average shift concentration), the level of ytterbium fluoride as moderate fibrogenic dust at 6 mg/cu m. PMID:7881860

  20. STS-88 Day 10 Highlights

    NASA Technical Reports Server (NTRS)

    1998-01-01

    On this tenth day of the STS-88 mission, the flight crew, Commander Robert D. Cabana, Pilot Frederick W. Sturckow, and Mission Specialists Nancy J. Currie, James H. Newman, Jerry L. Ross, and Sergei Krikalev are awakened by the sounds of Elvis Presley's "Hound Dog". Today's activities are devoted mostly to tasks that ready the station for future assembly work. The crew's first job is to release some cable ties on four cables connected on an earlier space walk, three located on Unity's upper mating adapter and one on its lower adapter, to relieve tension on the lines. The space walkers also will check an insulation cover on one cable connection on the lower Pressurized Mating Adapter (PMA 2) to make sure it is fully installed. Near the end of the space walk, the astronauts conduct a detailed photographic survey of the space station from top to bottom. Finally, each astronaut test fires the Simplified Aid for Extravehicular Activity Rescue (SAFER) jet backpacks they are wearing, a type of space "lifejacket," that would allow an astronaut to fly back to the station if they should ever become untethered.

  1. Temporary Arterial Balloon Occlusion as an Adjunct to Yttrium-90 Radioembolization

    SciTech Connect

    Hagspiel, Klaus D., E-mail: kdh2n@virginia.edu [University of Virginia Health System, Department of Radiology and Medical Imaging (United States); Nambiar, Ashwin, E-mail: uvashwin@gmail.com [SUNY Downstate Medical Center, Department of Radiology (United States); Hagspiel, Lauren M., E-mail: lmh4gg@virginia.edu [University of Virginia, College of Arts and Sciences (United States); Ahmad, Ehab Ali, E-mail: ehabradiodiagnosis@yahoo.com [Minia University, Department of Radiology (Egypt); Bozlar, Ugur, E-mail: ubozlar@yahoo.com [Gulhane Military Medical Academy, Department of Radiology (Turkey)

    2013-06-15

    Purpose. This study was designed to describe the technique of arterial occlusion using a temporary occlusion balloon system as an alternative to coil occlusion during Yttrium-90 radioembolization of hepatic tumors. Methods. Review of charts, angiography, and follow-up imaging studies of consecutive patients undergoing oncological embolization procedures in which a HyperForm system (ev3 Neurovascular, Irvine, CA) was used. Intraprocedural target vessel occlusion and patency of the target vessel on follow-up were recorded. Clinical data and Bremsstrahlung scans were reviewed for evidence of nontarget embolization. Results. Four radioembolization procedures were performed in three patients (all female, age 48-54 (mean 52) years). Five arteries were temporarily occluded (three gastroduodenal arteries, one right gastric artery, and one cystic artery). All radioembolization procedures were successfully completed. Follow-up imaging (either digital subtraction angiography (DSA) or computed tomography angiography (CTA)) was available for all patients between 28-454 (mean 183) days following the procedure, demonstrating all five vessels to be patent. No clinical or imaging evidence for nontarget embolization was found. Conclusions. Temporary balloon occlusion of small and medium-sized arteries during radioembolization allows safe therapy with preserved postprocedural vessel patency on early and midterm follow-up.

  2. Treatment of exhaust fluorescent lamps to recover yttrium: experimental and process analyses.

    PubMed

    De Michelis, Ida; Ferella, Francesco; Varelli, Ennio Fioravante; Vegliò, Francesco

    2011-12-01

    The paper deals with recovery of yttrium from fluorescent powder coming from dismantling of spent fluorescent tubes. Metals are leached by using different acids (nitric, hydrochloric and sulphuric) and ammonia in different leaching tests. These tests show that ammonia is not suitable to recover yttrium, whereas HNO(3) produces toxic vapours. A full factorial design is carried out with HCl and H(2)SO(4) to evaluate the influence of operating factors. HCl and H(2)SO(4) leaching systems give similar results in terms of yttrium extraction yield, but the last one allows to reduce calcium extraction with subsequent advantage during recovery of yttrium compounds in the downstream. The greatest extraction of yttrium is obtained by 20% w/v S/L ratio, 4N H(2)SO(4) concentration and 90°C. Yttrium and calcium yields are nearly 85% and 5%, respectively. The analysis of variance shows that acid concentration alone and interaction between acid and pulp density have a significant positive effect on yttrium solubilization for both HCl and H(2)SO(4) medium. Two models are empirically developed to estimate yttrium and calcium concentration during leaching. Precipitation tests demonstrate that at least the stoichiometric amount of oxalic acid is necessary to recover yttrium efficiently and a pure yttrium oxalate n-hydrate can be produced (99% grade). The process is economically feasible if other components of the fluorescent lamps (glass, ferrous and non-ferrous scraps) are recovered after the equipment dismantling and valorized, besides the cost that is usually paid to recycling companies for collection, treatment or final disposal of such fluorescent powders. PMID:21840197

  3. Structural, electrical and dielectric properties of yttrium substituted nickel ferrites

    Microsoft Academic Search

    M. Ishaque; M. U. Islam; M. Azhar Khan; I. Z. Rahman; A. Genson; S. Hampshire

    2010-01-01

    The influence of Y3+ substitution on the structural, electrical and dielectric properties of Ni–Y ferrites was studied in the ferrite series NiY2xFe2?2xO4 where x=0–0.12 in steps of 0.02. This series was prepared by conventional double sintering ceramic method. XRD analysis reveals single phase samples up to x=0.06. At x?0.08, a secondary phase of iron yttrium oxide (YFeO3) appears along with

  4. Structural, dielectric, and optical properties of yttrium calcium borate glasses

    Microsoft Academic Search

    Cristiane N. Santos; Domingos de Sousa Meneses; Patrick Echegut; Daniel R. Neuville; Antonio C. Hernandes; Alain Ibanez

    2009-01-01

    Structural and optical properties of stable glasses in the Y2O3-CaO-B2O3 system, containing the same Y\\/Ca ratio as the YCa4O(BO3)3 (YCOB) crystal, were determined from Raman and reflectance infrared spectroscopy. Changes in optical functions with composition are associated with an increase in the number of non-bridging oxygen and to calcium\\/yttrium oxides content. Refractive indexes values (from 1.597 to 1.627 at lambda=2

  5. Structural, dielectric, and optical properties of yttrium calcium borate glasses

    Microsoft Academic Search

    Cristiane N. Santos; Domingos De Sousa Meneses; Patrick Echegut; Daniel R. Neuville; Antonio C. Hernandes; Alain Ibanez

    2009-01-01

    Structural and optical properties of stable glasses in the Y2O3–CaO–B2O3 system, containing the same Y\\/Ca ratio as the YCa4O(BO3)3 (YCOB) crystal, were determined from Raman and reflectance infrared spectroscopy. Changes in optical functions with composition are associated with an increase in the number of non-bridging oxygen and to calcium\\/yttrium oxides content. Refractive indexes values (from 1.597 to 1.627 at ?=2

  6. Knee arthroscopy after yttrium or osmic acid injection

    SciTech Connect

    Guaydier-Souquieres, C.; Beguin, J.; Ollivier, D.; Loyau, G.

    1989-01-01

    This study presents the macroscopic and histologic results of 35 knee arthroscopies performed on patients with rheumatoid arthritis, some months after an yttrium or osmic acid intraarticular injection. The procedure was most often performed after a failure of the injection or a relapse of synovitis. Arthroscopy provides an understanding of the cause of synoviorthesis failure--insufficient action of the product on the synovitis or its poor diffusion, fibri-nonecrotic deposits, or cartilaginous lesions--and may be used both diagnostically and therapeutically.

  7. Rare earth and yttrium phosphate solubilities in aqueous solution

    NASA Astrophysics Data System (ADS)

    Liu, Xuewu; Byrne, Robert H.

    1997-04-01

    Rare earth and yttrium phosphate solubility products range over more than 1 order of magnitude. Minimum solubilities are observed for light rare earths between Ce and Sm. For the elements Ce, Pr, Nd, and Sm solubility products (log Ksp0 ( M) = log ([ Mi3+] [PO 43-])) at zero ionic strength and 25°C can be approximated as log Ksp0,( M) = -26.3 ± 0.2. Rare earth phosphate solubility products for well-aged, coarse precipitates increase substantially between Sm and Lu, with log Ksp0(Lu) estimated as -24.7. The solubility product of Y is similar to that of Ho (log Ksp0 (Y) = -25.0) and is much higher than those of all light rare earths. The solubility product of La is substantially larger than that of Cc (log Ksp 0(La) - log Ksp0 (Ce) ? 0.5). Solubility products are strongly dependent on the conditions of solid phase formation. Fresh precipitates are much more soluble than slowly formed, well-aged, coarse precipitates. The pattern of rare earth and yttrium phosphate solubility products is generally similar to the fractionation patterns which are developed during phosphate coprecipitation.

  8. Yttrium oxide based three dimensional metamaterials for visible light cloaking

    NASA Astrophysics Data System (ADS)

    Rai, Pratyush; Kumar, Prashanth S.; Varadan, Vijay K.; Ruffin, Paul; Brantley, Christina; Edwards, Eugene

    2014-04-01

    Metamaterial with negative refractive index is the key phenomenon behind the concept of a cloaking device to hide an object from light in visible spectrum. Metamaterials made of two and three dimensional lattices of periodically placed electromagnetic resonant cells can achieve absorption and propagation of incident electromagnetic radiation as confined electromagnetic fields confined to a waveguide as surface plasmon polaritons, which can be used for shielding an object from in-tune electromagnetic radiation. The periodicity and dimensions of resonant cavity determine the frequency, which are very small as compared to the wavelength of incident light. Till now the phenomena have been demonstrated only for lights in near infrared spectrum. Recent advancements in fabrication techniques have made it possible to fabricate array of three dimensional nanostructures with cross-sections as small as 25 nm that are required for negative refractive index for wavelengths in visible light spectrum of 400-700 nm and for wider view angle. Two types of metamaterial designs, three dimensional concentric split ring and fishnet, are considered. Three dimensional structures consisted of metal-dielectric-metal stacks. The metal is silver and dielectric is yttrium oxide, other than conventional materials such as FR4 and Duroid. High ? dielectric and high refractive index as well as large crystal symmetry of Yttrium oxide has been investigated as encapsulating medium. Dependence of refractive index on wavelength and bandwidth of negative refractive index region are analyzed for application towards cloaking from light in visible spectrum.

  9. Recovery of yttrium from fluorescent powder of cathode ray tube, CRT: Zn removal by sulphide precipitation.

    PubMed

    Innocenzi, Valentina; De Michelis, Ida; Ferella, Francesco; Beolchini, Francesca; Kopacek, Bernd; Vegliò, Francesco

    2013-11-01

    This work is focused on the recovery of yttrium and zinc from fluorescent powder of cathode ray tube (CRT). Metals are extracted by sulphuric acid in the presence of hydrogen peroxide. Leaching tests are carried out according to a 2(2) full factorial plan and the highest extraction yields for yttrium and zinc equal to 100% are observed under the following conditions: 3M of sulphuric acid, 10% v/v of H2O2 concentrated solution at 30% v/v, 10% w/w pulp density, 70°C and 3h of reaction. Two series of precipitation tests for zinc are carried out: a 2(2) full factorial design and a completely randomized factorial design. In these series the factors investigated are pH of solution during the precipitation and the amount of sodium sulphide added to precipitate zinc sulphide. The data of these tests are used to describe two empirical mathematical models for zinc and yttrium precipitation yields by regression analysis. The highest precipitation yields for zinc are obtained under the following conditions: pH equal to 2-2.5% and 10-12%v/v of Na2S concentrated solution at 10%w/v. In these conditions the coprecipitation of yttrium is of 15-20%. Finally further yttrium precipitation experiments by oxalic acid on the residual solutions, after removing of zinc, show that yttrium could be recovered and calcined to obtain the final product as yttrium oxide. The achieved results allow to propose a CRT recycling process based on leaching of fluorescent powder from cathode ray tube and recovery of yttrium oxide after removing of zinc by precipitation. The final recovery of yttrium is 75-80%. PMID:23910246

  10. Opportunity Spies Its Target

    NASA Technical Reports Server (NTRS)

    2004-01-01

    This is a forward-looking view of the Meridiani Planum plains that lie between the Mars Exploration Rover Opportunity and its primary drive target, 'Endurance Crater.' The images in this image mosaic were taken by the rover's panoramic camera on sol 88.

  11. Synthesis and characterization of nanocrystalline yttrium oxide prepared with tetraalkylammonium hydroxides

    SciTech Connect

    Fokema, M.D.; Chiu, E.; Ying, J.Y.

    2000-04-04

    Controlled chemical precipitation of yttrium hydroxynitrate has been used to synthesize nanocrystalline yttrium oxide powders with high thermal stability. The type of base employed as the precipitating agent has a significant effect on the properties of the yttrium oxide product. Precipitation with tetraalkylammonium hydroxides was shown to produce a much finer-grained product than a conventional ammonium hydroxide synthesis route. This is attributed to the higher pH that can be achieved with tetraalkylammonium hydroxides, as well as the ability of tetraalkylammonium cations to inhibit precipitate particle growth by lowering the rate of diffusion of soluble precursors to the particle surface.

  12. Preparation, structure, and in vitro chemical durability of yttrium phosphate microspheres for intra-arterial radiotherapy.

    PubMed

    Kawashita, Masakazu; Matsui, Naoko; Li, Zhixia; Miyazaki, Toshiki; Kanetaka, Hiroyasu

    2011-10-01

    Chemically durable microspheres containing yttrium and/or phosphorus are useful for intra-arterial radiotherapy. In this study, we attempted to prepare yttrium phosphate (YPO?) microspheres with high chemical durability. YPO? microspheres with smooth surfaces and diameters of around 25 ?m were successfully obtained when gelatin droplets containing yttrium and phosphate ions were cooled and solidified in a water-in-oil emulsion and then heat-treated at 1100°C. The chemical durability of the heat-treated microspheres in a simulated body fluid at pH = 6 and 7 was high enough for clinical application of intra-arterial radiotherapy. PMID:21714075

  13. Nanomechanical and optical properties of yttrium thin films by magnetron sputtering.

    PubMed

    Ramaseshan, R; Sundari, S Tripura; Balamurugan, A K; Dash, Sitaram; Tyagi, A K; Sato, Y; Nakayama, T; Suematsu, H

    2014-06-01

    This Letter reports on nanomechanical and optical properties of yttrium thin films deposited on an Si (100) wafer. Elemental depth profiling by a secondary ion mass spectrometer revealed absence of formation of yttrium hydride, both on the surface and beneath. The optical properties were investigated by spectroscopic ellipsometry, and the refractive indices extracted after suitable modeling were found to be 2.51 at 546 nm. Hardness and elastic modulus of these films were found to be 7 and 142 GPa, respectively. These studies indicate that yttrium thin films are suitable for x-ray mirrors, photocathode emitters in e-beam lithography, electron microscopes, and free-electron lasers. PMID:24875983

  14. Identification and Function of Myeloid Differentiation Factor 88 (MyD88) in Litopenaeus vannamei

    PubMed Central

    Zhang, Shuang; Li, Chao-Zheng; Yan, Hui; Qiu, Wei; Chen, Yong-Gui; Wang, Pei-Hui; Weng, Shao-Ping; He, Jian-Guo

    2012-01-01

    Myeloid differentiation factor 88 (MyD88) is a universal and essential signaling protein in Toll-like receptor/interleukin-1 receptor-induced activation of nuclear factor-kappa B. In this study, two MyD88 protein variants (LvMyD88 and LvMyD88-1) were identified in Litopenaeus vannamei. The LvMyD88 cDNA is 1,848 bp in length and contains an open reading frame (ORF) of 1,428 bp, whereas the LvMyD88-1 cDNA is 1,719 bp in length and has an ORF of 1,299 bp. Both variants encode proteins with death and Toll/interleukin-1 receptor domains and share 91% sequence identity. In healthy L. vannamei, the LvMyD88 genes were highly expressed in hemocytes but at a low level in the hepatopancreas. The LvMyD88s expression was induced in hemocytes after challenge with lipopolysaccharide, CpG-ODN2006, Vibrio parahaemolyticus, Staphyloccocus aureus, and white spot syndrome virus, but not by poly I?C. Overexpression of LvMyD88 and LvMyD88-1 in Drosophila Schneider 2 cells led to activation of antimicrobial peptide genes and wsv069 (ie1), wsv303, and wsv371. These results suggested that LvMyD88 may play a role in antibacterial and antiviral response in L. vannamei. To our knowledge, this is the first report on MyD88 in shrimp and a variant of MyD88 gene in invertebrates. PMID:23071706

  15. Two myeloid differentiation factor 88 (MyD88) isoforms identified in ducks.

    PubMed

    Cheng, Yuqiang; Wang, Hengan; Yan, Yaxian; Ding, Chan; Sun, Jianhe

    2015-10-01

    MyD88 is an adaptor protein involved in the interleukin-1 receptor-induced and Toll-like receptor (TLR)-induced activation of nuclear factor-?B (NF-?B). In this study, we identified two isoforms of MyD88 gene, designated DuMyD88-X1 and DuMyD88-X2, from duck cells. Both variants were determined to have a death domain at the N-terminal and a Toll/IL-1R (TIR) domain at the C-terminal; however, the TIR domain of DuMyD88-X2 was incomplete and was 81 amino acids shorter than DuMyD88-X1. Quantitative real-time reverse transcription PCR revealed broad expression of both MyD88s. During Newcastle disease virus (NDV) challenge experiments, expression of the two genes increased significantly, with DuMyD88-X1 having a larger amplitude and longer duration. Overexpression of DuMyD88-X1 and DuMyD88-X2 induced the activation of NF-?B and IL-6 in vitro, suggesting that DuMyD88-X1 and DuMyD88-X2 may be important in the innate immune response. The results verify the existence of a MyD88-dependent signaling pathway in ducks and contribute to understanding the potential role of MyD88s in the innate immune response. PMID:26004012

  16. STS-88 crew goes through Crew Equipment Interface Testing

    NASA Technical Reports Server (NTRS)

    1998-01-01

    In the Orbiter Processing Facility Bay 1, STS-88 Commander Robert D. Cabana watches from inside Space Shuttle orbiter Endeavour as worker Tracey Hackett cleans the outside of a window. The STS-88 crew members are participating in a Crew Equipment Interface Test (CEIT), familiarizing themselves with the orbiter's midbody and crew compartments. Targeted for liftoff on Dec. 3, 1998, STS-88 will be the first Space Shuttle launch for assembly of the International Space Station (ISS). The primary payload is the Unity connecting module which will be mated to the Russian-built Zarya control module, expected to be already on orbit after a November launch from Russia. The first major U.S.-built component of ISS, Unity will serve as a connecting passageway to living and working areas of the space station. Unity has two attached pressurized mating adapters (PMAs) and one stowage rack installed inside. PMA-1 provides the permanent connection point between Unity and Zarya; PMA-2 will serve as a Space Shuttle docking port. Zarya is a self-supporting active vehicle, providing propulsive control capability and power during the early assembly stages. It also has fuel storage capability.

  17. Pulsed laser ablation deposition of yttrium iron garnet and cerium-substituted YIG films

    NASA Astrophysics Data System (ADS)

    Ibrahim, N. B.; Edwards, C.; Palmer, S. B.

    2000-10-01

    Yttrium iron garnet (YIG) thin films were grown on gadolinium gallium garnet substrates using pulsed laser ablation deposition (PLAD) with a XeCl excimer laser. Films were grown up to over 2 ?m thick, however cracking proved to be a problem for films over 1 ?m thick. The lattice parameter(s) of the films and the substrates were measured and indicated that the film/substrate structure was bending to accommodate strain due to the lattice mismatch. The films had saturation magnetisation values close to that of bulk YIG and were isotropic in the film plane. The magnetisation data also indicate stress-induced uniaxial isotropy. The ablation conditions were varied to produce uncracked films with low droplet densities. YIG melts incongruently during the laser ablation process and cone-like structures form on the ablation target lowering the ablation rates. Cerium-substituted YIG films were also grown in both oxygen and argon atmospheres, substituting cerium into YIG increases the lattice parameter and hence reduces the strain. The Ce-YIG film grown in argon was greenish indicating that cerium was in the desired oxidation state.

  18. Growth of different phases of yttrium manganese oxide thin films by pulsed laser deposition

    SciTech Connect

    Kumar, Manish; Choudhary, R. J.; Phase, D. M. [UGC-DAE Consortium for Scientific Research, Khandwa Road, Indore, 452001 (India)

    2012-06-05

    Various phases of yttrium manganese oxide (YMO) thin films have been synthesized on different substrates from a single target of h-YMnO{sub 3}. It is observed that the phase stability and crystallinity of YMO thin films depend on the substrate used and oxygen partial pressure (OPP). (110) oriented and polycrystalline growth of h-YMnO{sub 3} are observed on the Al{sub 2}O{sub 3} (0001) and NGO (110) substrates respectively, when grown in OPP {approx_equal} 10{sup -6} Torr. While for similar OPP value, growth of mixed phases (h-YMnO{sub 3} and o-YMn{sub 2}O{sub 5}) is observed on Si (001) substrate. Oriented growth of O-YMn{sub 2}O{sub 5} phase film on Si (001) substrate is observed first time, when deposited at OPP value of 225 and 350 mTorr. +3 and mixed oxidation states (+3 and +4) of Mn were confirmed by x-ray photoelectron spectroscopy in pure YMnO{sub 3} phase and YMn{sub 2}O{sub 5} phase respectively.

  19. Hepatobiliary effects of 90yttrium microsphere therapy for unresectable hepatocellular carcinoma.

    PubMed

    Nalesnik, Michael A; Federle, Michael; Buck, David; Fontes, Paulo; Carr, Brian I

    2009-01-01

    (90)Yttrium (Therasphere) microspheres administered via hepatic artery are a valuable option for treatment of hepatocellular carcinoma. This therapy targets tumor nodules while largely sparing hepatic parenchyma. This retrospective study examines liver explants from 13 adult patients with hepatocellular carcinoma who received intrahepatic Theraspheres and subsequently underwent liver transplantation. Histopathologic and laboratory reviews are performed. Theraspheres preferentially migrated to the lobe(s) supplied by the injected artery branches and frequently localized to tumors. Tumors showed a chronology of changes beginning with confluent necrosis typically accompanied by hemorrhage and later by fibrinoid change. This was followed by fibrosis with regenerative activity at tumor peripheries. Adjacent hepatic parenchyma went through a similar sequence of injury and repair that could lead to markedly fibrotic cirrhotic nodules in the vicinity of treated tumors. No consistent pattern of thrombomodulin loss was seen in endothelial cells of the tumors or adjacent parenchyma, suggesting that direct endothelial cell injury was likely not a major contributor to the necrotic process. However, the pattern of injury and repair is suggestive of a localized and subclinical form of radiation-induced liver disease. The pathologist should be aware of these changes to distinguish them from the diffuse "radiation hepatitis" associated with older forms of radiotherapy. PMID:18799190

  20. 9 CFR 88.2 - General information.

    Code of Federal Regulations, 2011 CFR

    2011-01-01

    ...PRODUCTS COMMERCIAL TRANSPORTATION OF EQUINES FOR SLAUGHTER § 88.2 General information...individual or other entity found to transport equines to a slaughtering facility is subject...individual or other entity who transported the equines information regarding the business...

  1. 9 CFR 88.2 - General information.

    Code of Federal Regulations, 2010 CFR

    2010-01-01

    ...PRODUCTS COMMERCIAL TRANSPORTATION OF EQUINES FOR SLAUGHTER § 88.2 General information...individual or other entity found to transport equines to a slaughtering facility is subject...individual or other entity who transported the equines information regarding the business...

  2. 42 CFR 88.2 - General provisions.

    Code of Federal Regulations, 2013 CFR

    2013-10-01

    ...SERVICE, DEPARTMENT OF HEALTH AND HUMAN SERVICES OCCUPATIONAL SAFETY AND HEALTH RESEARCH AND RELATED ACTIVITIES WORLD TRADE CENTER HEALTH PROGRAM § 88.2 General provisions. (a) Designated representative. (1) An applicant,...

  3. 42 CFR 88.2 - General provisions.

    Code of Federal Regulations, 2014 CFR

    2014-10-01

    ...SERVICE, DEPARTMENT OF HEALTH AND HUMAN SERVICES OCCUPATIONAL SAFETY AND HEALTH RESEARCH AND RELATED ACTIVITIES WORLD TRADE CENTER HEALTH PROGRAM § 88.2 General provisions. (a) Designated representative. (1) An applicant,...

  4. 42 CFR 88.2 - General provisions.

    Code of Federal Regulations, 2011 CFR

    2011-10-01

    ...SERVICE, DEPARTMENT OF HEALTH AND HUMAN SERVICES OCCUPATIONAL SAFETY AND HEALTH RESEARCH AND RELATED ACTIVITIES WORLD TRADE CENTER HEALTH PROGRAM § 88.2 General provisions. (a) Designated representative. (1) An applicant,...

  5. 42 CFR 88.2 - General provisions.

    Code of Federal Regulations, 2012 CFR

    2012-10-01

    ...SERVICE, DEPARTMENT OF HEALTH AND HUMAN SERVICES OCCUPATIONAL SAFETY AND HEALTH RESEARCH AND RELATED ACTIVITIES WORLD TRADE CENTER HEALTH PROGRAM § 88.2 General provisions. (a) Designated representative. (1) An applicant,...

  6. 42 CFR 88.1 - Definitions.

    Code of Federal Regulations, 2012 CFR

    2012-10-01

    ...SERVICE, DEPARTMENT OF HEALTH AND HUMAN SERVICES OCCUPATIONAL SAFETY AND HEALTH RESEARCH AND RELATED ACTIVITIES WORLD TRADE CENTER HEALTH PROGRAM § 88.1 Definitions. List of WTC-Related Health Conditions (4) Cancers:...

  7. 32 CFR 552.88 - Responsibilities.

    Code of Federal Regulations, 2010 CFR

    2010-07-01

    ...RESERVATIONS Fort Lewis Land Use Policy § 552.88 Responsibilities...release of Ft. Lewis Land Use Policy and area access procedures...relations issues related to land use. Coordinate special...of public response to policy...

  8. 40 CFR 88.202-94 - Definitions.

    Code of Federal Regulations, 2010 CFR

    2010-07-01

    ...PROGRAMS (CONTINUED) CLEAN-FUEL VEHICLES California Pilot Test Program § 88.202-94 Definitions. (a) The definitions...sales numbers do not exhibit a functional equivalence per the language of § 86.708-94(b)(1) of this chapter....

  9. 36 CFR 223.88 - Bidding methods.

    Code of Federal Regulations, 2014 CFR

    2014-07-01

    ...Property FOREST SERVICE, DEPARTMENT OF AGRICULTURE SALE AND DISPOSAL OF NATIONAL FOREST SYSTEM TIMBER, SPECIAL FOREST PRODUCTS, AND FOREST BOTANICAL PRODUCTS Timber Sale Contracts Advertisement and Bids § 223.88 Bidding methods....

  10. 36 CFR 223.88 - Bidding methods.

    Code of Federal Regulations, 2011 CFR

    2011-07-01

    ...Property FOREST SERVICE, DEPARTMENT OF AGRICULTURE SALE AND DISPOSAL OF NATIONAL FOREST SYSTEM TIMBER, SPECIAL FOREST PRODUCTS, AND FOREST BOTANICAL PRODUCTS Timber Sale Contracts Advertisement and Bids § 223.88 Bidding methods....

  11. 36 CFR 223.88 - Bidding methods.

    Code of Federal Regulations, 2012 CFR

    2012-07-01

    ...Property FOREST SERVICE, DEPARTMENT OF AGRICULTURE SALE AND DISPOSAL OF NATIONAL FOREST SYSTEM TIMBER, SPECIAL FOREST PRODUCTS, AND FOREST BOTANICAL PRODUCTS Timber Sale Contracts Advertisement and Bids § 223.88 Bidding methods....

  12. 36 CFR 223.88 - Bidding methods.

    Code of Federal Regulations, 2013 CFR

    2013-07-01

    ...Property FOREST SERVICE, DEPARTMENT OF AGRICULTURE SALE AND DISPOSAL OF NATIONAL FOREST SYSTEM TIMBER, SPECIAL FOREST PRODUCTS, AND FOREST BOTANICAL PRODUCTS Timber Sale Contracts Advertisement and Bids § 223.88 Bidding methods....

  13. 21 CFR 500.88 - Regulatory method.

    Code of Federal Regulations, 2011 CFR

    2011-04-01

    ... § 500.88 Regulatory method. (a) The sponsor shall submit for evaluation and validation a regulatory method developed to monitor compliance...from the submitted analytical method validation data. (c) FDA will...

  14. 21 CFR 500.88 - Regulatory method.

    Code of Federal Regulations, 2010 CFR

    2010-04-01

    ... § 500.88 Regulatory method. (a) The sponsor shall submit for evaluation and validation a regulatory method developed to monitor compliance...from the submitted analytical method validation data. (c) FDA will...

  15. 37 CFR 1.88 - [Reserved

    Code of Federal Regulations, 2010 CFR

    2010-07-01

    ...TRADEMARK OFFICE, DEPARTMENT OF COMMERCE GENERAL RULES OF PRACTICE IN PATENT CASES National Processing Provisions The Drawings § 1.88 [Reserved] Models, Exhibits, Specimens Authority: Secs. 1.91 to 1.95 also issued under 35...

  16. Rare Earth Doped Yttrium Aluminum Garnet (YAG) Selective Emitters

    NASA Technical Reports Server (NTRS)

    Chubb, Donald L.; Pal, AnnaMarie T.; Patton, Martin O.; Jenkins, Phillip P.

    1999-01-01

    As a result of their electron structure, rare earth ions in crystals at high temperature emit radiation in several narrow bands rather than in a continuous blackbody manner. This study presents a spectral emittance model for films and cylinders of rare earth doped yttrium aluminum garnets. Good agreement between experimental and theoretical film spectral emittances was found for erbium and holmium aluminum garnets. Spectral emittances of films are sensitive to temperature differences across the film. For operating conditions of interest, the film emitter experiences a linear temperature variation whereas the cylinder emitter has a more advantageous uniform temperature. Emitter efficiency is also a sensitive function of temperature. For holminum aluminum garnet film the efficiency is 0.35 at 1446K but only 0.27 at 1270 K.

  17. Optical transmission spectroscopy of switchable yttrium hydride films

    NASA Astrophysics Data System (ADS)

    Kremers, M.; Koeman, N. J.; Griessen, R.; Notten, P. H. L.; Tolboom, R.; Kelly, P. J.; Duine, P. A.

    1998-02-01

    The optical transmission of the recently discovered switchable yttrium hydride films is determined spectroscopically as a function of hydrogen content. This is done during electrochemical loading of Pd-capped Y film electrodes, thereby continuously changing the hydrogen concentration. The effect of the Pd cap layer on the film transmission is determined from measurements on a series of films with varying Pd layer thickness. The results are in good agreement with transmission measurements of in situ gas phase loaded, uncapped Y films. Both data sets can be consistently described with simple optical decay lengths such as 277.8 nm for YH3-? and 15.1 nm for Pd at ??=1.96 eV. The hydrogen concentration dependence of the optical transmission is discussed and compared with previous optical measurements on bulk samples and band-structure calculations.

  18. Sodium yttrium fluoride based upconversion nano phosphors for biosensing

    NASA Astrophysics Data System (ADS)

    Parameswaran Nampi, Padmaja; Varma, Harikrishna; Biju, P. R.; Kakkar, Tarun; Jose, Gin; Saha, Sikha; Millner, Paul

    2015-06-01

    In the present study, NaYF4-Yb3+/Er3+ having the composition NaYF4-18%Yb3+/2%Er3+ and NaYF4-20%Yb3+/2%Er3+ with and without the addition of PVP (polyvinyl pyrolidone) have been synthesised by a solution method using NaF, yttrium nitrate, ytterbium nitrate and erbium nitrate as precursors. Upconversion spectra of prepared nanomaterial under 980 nm laser excitation have been studied. The variation in upconversion spectra with new born calf serum and myoglobin has been studied. Myoglobin (Mb) may be helpful when used in conjunction with other cardiac markers for rapid determination of acute myocardial ischemia, especially in patients with a typical chest pain or nonspecific ECG changes. The variation of UC fluorescence with addition of Mb indicates the suitability of using NaYF4 based UC nanoparticles in cardiac marker detection. The detailed study is currently under progress.

  19. Local structure of oxygen-deficient Yttrium oxide

    NASA Astrophysics Data System (ADS)

    Cheng, Xue-Rui; Dai, Hai-Yang; Qi, Ze-Ming; Wang, Yu-Yin; Zhang, Guo-Bin

    2013-09-01

    Yttrium oxide thin films have been deposited on Si (100) substrate by using pulsed laser deposition (PLD) method. X-ray diffraction (XRD), hard and soft X-ray absorption spectroscopy (XAFS) are employed to investigate the origin of oxygen vacancies and their influence on the structure and atomic distributions. The XRD results indicate that the Y2O3 thin films strongly orient the (111) axis of the cubic structure. Analyses on the Y K-edge extended X-ray absorption fine structures reveal that the coordination number of Y atoms decreases and the bond length of Y-O contracts due to the loss of oxygen atoms. The X-ray absorption near edge structure analysis together with a theoretical approach further confirms the oxygen vacancies formation and their possible location.

  20. Structural, dielectric, and optical properties of yttrium calcium borate glasses

    NASA Astrophysics Data System (ADS)

    Santos, Cristiane N.; De Sousa Meneses, Domingos; Echegut, Patrick; Neuville, Daniel R.; Hernandes, Antonio C.; Ibanez, Alain

    2009-04-01

    Structural and optical properties of stable glasses in the Y2O3-CaO-B2O3 system, containing the same Y/Ca ratio as the YCa4O(BO3)3 (YCOB) crystal, were determined from Raman and reflectance infrared spectroscopy. Changes in optical functions with composition are associated with an increase in the number of non-bridging oxygen and to calcium/yttrium oxides content. Refractive indexes values (from 1.597 to 1.627 at ? =2 ?m) are in good agreement with those of the YCOB crystal, an indication that these glasses are potential candidates for optical applications due to their ease of shaping as large bulk samples or fibers.

  1. Yttrium-90 Radioembolization of Hepatic Metastases from Colorectal Cancer

    PubMed Central

    Raval, Mihir; Bande, Dinesh; Pillai, Anil K.; Blaszkowsky, Lawrence S.; Ganguli, Suvranu; Beg, Muhammad S.; Kalva, Sanjeeva P.

    2014-01-01

    Liver metastases from colorectal cancer (CRC) result in substantial morbidity and mortality. The primary treatment is systemic chemotherapy, and in selected patients, surgical resection; however, for patients who are not surgical candidates and/or fail systemic chemotherapy, liver-directed therapies are increasingly being utilized. Yttrium-90 (Y-90) microsphere therapy, also known as selective internal radiation therapy (SIRT) or radioembolization, has proven to be effective in terms of extending time to progression of disease and also providing survival benefit. This review focuses on the use of Y-90 microsphere therapy in the treatment of liver metastases from CRC, including a comprehensive review of published clinical trials and prospective studies conducted thus far. We review the methodology, outcomes, and side effects of Y-90 microsphere therapy for metastatic CRC. PMID:25120951

  2. Analytical chemistry of the Manhattan Project. Chapter XXVII. Scandium, yttrium, and rare earths

    Microsoft Academic Search

    L. L. Quill; C. J. Rodden

    2008-01-01

    Various methods for separating the above elements from uranium and thorium are given; precipitation, extraction, and volatilization procedures are given in detail. Gravimetric and spectrophotometric methods for determining the individual rare earths and scandium and yttrium are discussed.

  3. Sorptive separation of yttrium and cerium on a weakly basic anionite

    NASA Astrophysics Data System (ADS)

    Cheremisina, O. V.; Ponomareva, M. A.; Chirkst, D. E.; Lobacheva, O. L.; Shul'gin, I. A.

    2015-01-01

    The sorption of complex yttrium ions with Trilon B onto the weakly basic anionite D-403 in nitrate form from an acidic medium at pH 3 with constant ionic strength (NaNO3, 1 mol/kg) is investigated. A thermodynamic evaluation of the sorption isotherm of anionic yttrium complexes is performed using a method based on the linearization of the equation of the law of active mass, modified for ionic exchange reactions. The ionic exchange constant, the Gibbs free energy of ionic exchange, the capacity of the anionite, and the sorption limit of ethylenediaminetetraacetatoyttrate ions (EDTA yttrate ions) are calculated. Using a frontal version of ion exchange chromatography, cerium and yttrium are separated on D-403 anionite with a fraction of pure yttrium at the column outlet of no less than 30%.

  4. Preparation and properties of yttrium-doped lithium zirconate

    SciTech Connect

    Zou, Yun; Petric, A. (McMaster Univ., Hamilton, ON (Canada))

    1993-05-01

    Ceramic samples of Li[sub 2+x]Y[sub x]Zr[sub 1-x]O[sub 3] with x=0, 0.01, 0.05, and 0.1 were prepared by conventional methods. The crystal structures and microstructures of the ceramic samples were studied using x-ray diffraction, infrared spectra, and scanning electron microscopy. The results show that a solid solution of Li[sub 2+x]Y[sub x]Zr[sub 1-x]O[sub 3] was formed when x was not larger than 0.05 and a second phase appeared in the solid solution when x was equal to 0.1. The sinterability of Li[sub 2]ZrO[sub 3] improved greatly with addition of yttrium from 80.8% theoretical density (T.D.) for the sample without yttrium to 94.6% T.D. for the sample with x=0.05; the grain size decreased significantly with the formation of the solid solution. The total lithium ion conductivity increased slightly, from 3.9x10[sup [minus]6] S/cm for pure Li[sub 2]ZrO[sub 3] to 5.0 x 10[sup [minus]6] S/cm for the sample with x=0.05 at 400 C and the corresponding conduction activation energy decreased form 0.99 to 0.92 eV. Based on the effective medium theory, the conductivity increase in the solid solution crystal was estimated to be 3% for x= 0.05 compared with the pure Li[sub 2]ZrO[sub 3] crystal.

  5. Characterisation of bismuth-doped yttrium iron garnet layers prepared by sol–gel process

    Microsoft Academic Search

    J.-L Rehspringer; J. Bursik; D. Niznansky; A. Klarikova

    2000-01-01

    Yttrium iron garnets and Bi-substituted yttrium iron garnets were prepared by two different sol–gel processes. We investigated the evolution with temperature of XRD patterns and of the magnetisation of powders issued from sol–gel solution decomposition. We prepared layers on silica glass by the spin- or dip-coating processes. XRD patterns on layers were also obtained. The dependency of the Faraday effect

  6. A study on the effect factors of sol-gel synthesis of yttrium aluminum garnet nanopowders

    Microsoft Academic Search

    Lin Yang; Tiecheng Lu; Hui Xu; Wei Zhang; Benyuan Ma

    2010-01-01

    Yttrium aluminum garnet (YAG) nanopowders were synthesized by sol-gel method using aluminum nitrate, yttrium nitrate, and citric acid as starting materials, de-ionized water, ethanol, and ethylene glycol as solvents, respectively. The phase formation process, state of particle size distribution (PSD), compositions, morphological characteristics, and thermal behavior of the powders were investigated by means of x-ray diffractometry, PSD, Fourier transform infrared,

  7. SEPARATIONS OF YTTRIUM AND SOME RARE EARTHS BY LIQUID-LIQUID EXTRACTION

    Microsoft Academic Search

    R. A. Foos; H. A. Wilhelm

    1954-01-01

    The use of liquid-liquid extraction for the separation of some inorganic ;\\u000a compounds was demonstrated. The yttrium-- rare earth concentrates were obtained ;\\u000a from Fergusonite ore, Gadolinite ore, and a by-product from an ion-exchange resin ;\\u000a separation process. In each case the mixture in terms of oxide was composed of ;\\u000a from 50 to 60% yttrium and 5 to 15%

  8. Influence of the co-precipitation temperature on phase evolution in yttrium-aluminium oxide materials

    Microsoft Academic Search

    Paola Palmero; Claude Esnouf; Laura Montanaro; Gilbert Fantozzi

    2005-01-01

    Yttrium-aluminium garnet (YAG) powders were synthesized using a reverse-strike precipitation, by adding an aqueous solution of yttrium and aluminium chlorides to dilute ammonia while monitoring the pH to a constant value of 9. After precipitation, the gelly product was washed with dilute ammonia and absolute ethanol for avoiding hard agglomeration during drying. Precipitation and washing procedures were performed at three

  9. Yttrium implantation effect on 304L stainless steel high temperature oxidation at 1000°C

    Microsoft Academic Search

    F. Riffard; H. Buscail; E. Caudron; R. Cueff; C. Issartel; S. Perrier

    2002-01-01

    Scanning electron microscopy (SEM), energy dispersive X-ray spectrometry (EDXS) and in situ X-ray diffraction techniques were carried out to observe the oxide scale evolutions of yttrium implanted and unimplanted commercial 304L stainless steels during and after their high temperature oxidation at 1000°C for 100 h. Our results clearly demonstrate that yttrium implantation promotes a faster oxide scale growth and the

  10. Sol–gel derived highly transparent and conducting yttrium doped ZnO films

    Microsoft Academic Search

    Ravinder Kaur; A. V. Singh; R. M. Mehra

    2006-01-01

    This paper reports the structural, electrical and optical properties of Yttrium doped zinc oxide (YZO) thin films deposited on Corning (7059) glass substrates by spin coating technique. A precursor solution of ZnO, 0.2M in concentration was prepared from zinc acetate dissolved in anhydrous ethanol with diethanolamine as a sol gel stabilizer. Yttrium nitrate hexahydrate (Y2NO3·6H2O) was used as the dopant

  11. Improvement in the corrosion-erosion resistance of 304 stainless steel with alloyed yttrium

    Microsoft Academic Search

    Tiancheng Zhang; D. Y. Li

    2001-01-01

    It has been previously demonstrated that yttrium can improve the resistance of stainless steel to sliding wear in corrosive environment. However, the mechanism responsible for the beneficial effect of yttrium on corrosive wear is not well understood. In this work, the erosion behavior of Y-free and Y-containing 304 stainless steel in a dilute H2SO4 slurry containing silica sand was investigated,

  12. 28 CFR 115.88 - Data review for corrective action.

    Code of Federal Regulations, 2013 CFR

    2013-07-01

    ...for corrective action. 115.88 Section 115.88 Judicial Administration DEPARTMENT OF JUSTICE (CONTINUED) PRISON RAPE ELIMINATION ACT NATIONAL STANDARDS Standards for Adult Prisons and Jails Data Collection and Review § 115.88...

  13. 28 CFR 115.88 - Data review for corrective action.

    Code of Federal Regulations, 2012 CFR

    2012-07-01

    ...for corrective action. 115.88 Section 115.88 Judicial Administration DEPARTMENT OF JUSTICE (CONTINUED) PRISON RAPE ELIMINATION ACT NATIONAL STANDARDS Standards for Adult Prisons and Jails Data Collection and Review § 115.88...

  14. 47 CFR 80.88 - Secrecy of communication.

    Code of Federal Regulations, 2010 CFR

    2010-10-01

    ...2010-10-01 false Secrecy of communication. 80.88 Section 80.88 Telecommunication FEDERAL COMMUNICATIONS COMMISSION (CONTINUED) SAFETY...Procedures-General § 80.88 Secrecy of communication. The station licensee,...

  15. Biodistribution of Yttrium-90-Labeled Anti-CD45 Antibody in a Nonhuman Primate Model

    SciTech Connect

    Nemecek, Eneida; Hamlin, Donald K.; Fisher, Darrell R.; Krohn, Kenneth A.; Pagel, John M.; Applebaum, F. R.; Press, Oliver W.; Matthews, Dana C.

    2005-01-15

    Radioimmunotherapy may improve the outcome of hematopoietic cell transplantation for hematologic malignancies by delivering targeted radiation to hematopoietic organs while relatively sparing nontarget organs. We evaluated the organ localization of yttrium-90-labeled anti-CD45 (90Y-anti-CD45) antibody in macaques, a model that had previously predicted iodine-131-labeled anti-CD-45 (131I-anti-CD45) antibody biodistribution in humans. Experimental Design: Twelve Macaca nemestrina primates received anti-CD45 antibody labeled with 1 to 2 mCi of 90Y followed by serial blood sampling and marrow and lymph node biopsies, and necropsy. The content of 90Y per gram of tissue was determined by liquid scintillation spectrometry. Time-activity curves were constructed using average isotope concentrations in each tissue at measured time points to yield the fractional residence time and estimate radiation absorbed doses for each organ per unit of administered activity. The biodistribution of 90Y-anti-CD45 antibody was then compared with that previously obtained with 131I-anti-CD45 antibody in macaques. Results: The spleen received 2,120, marrow 1,060, and lymph nodes 315 cGy/mCi of 90Y injected. The liver and lungs were the nontarget organs receiving the highest radiation absorbed doses (440 and 285 cGy/mCi, respectively). Ytrrium-90-labeled anti-CD45 antibody delivered 2.5- and 3.7-fold more radiation to marrow than to liver and lungs, respectively. The ratios previously observed with 131I-antiCD45 antibody were 2.5-and 2.2-fold more radiation to marrow than to liver and lungs, respectively. Conclusions: This study shows that 90Y-anti-CD45 antibody can deliver relatively selective radiation to hematopoietic tissues, with similar ratios of radiation delivered to target versus nontarget organs, as compared with the 131I immunoconjugate in the same animal model.

  16. The selective catalytic reduction of nitric oxide with methane over scandium oxide, yttrium oxide and lanthanum oxide

    Microsoft Academic Search

    Mark D Fokema; Jackie Y Ying

    1998-01-01

    The selective catalytic reduction of nitric oxide with methane over nanocrystalline Group IIIB metal oxides was investigated between 400°C and 675°C. Scandium oxide and yttrium oxide are better catalysts than lanthanum oxide because they have a greater specific activity and selectivity. The activity of yttrium oxide is 75% of that of Co-ZSM-5 at 600°C and yttrium oxide was also found

  17. 0145-6008/88/1201-01 19%2.00/0 ALCOHOLISM:CLINICAL AND EXPERIMENTALRFSEARCH

    E-print Network

    Biederman, Irving

    0145-6008/88/1201-01 19%2.00/0 ALCOHOLISM:CLINICAL AND EXPERIMENTALRFSEARCH Vol. 12,No. 1 January/February 1988 Motor Performance in Detoxified Alcoholics James L. York, PhD and Irving was increasedmoreinalcoholics as target separation decreased. Female alcoholics displayed im- pairment in speed of movement

  18. 40 CFR 88.103-94 - Abbreviations.

    Code of Federal Regulations, 2013 CFR

    2013-07-01

    ...The abbreviations in this section apply to all of part 88. ALVW—Adjusted Loaded Vehicle Weight CO—Carbon Monoxide HCHO—Formaldehyde HC—Hydrocarbon HDV—Heavy-Duty Vehicle LDT—Light-Duty Truck LDV—Light-Duty Vehicle...

  19. 40 CFR 88.103-94 - Abbreviations.

    Code of Federal Regulations, 2011 CFR

    2011-07-01

    ...The abbreviations in this section apply to all of part 88. ALVW—Adjusted Loaded Vehicle Weight CO—Carbon Monoxide HCHO—Formaldehyde HC—Hydrocarbon HDV—Heavy-Duty Vehicle LDT—Light-Duty Truck LDV—Light-Duty Vehicle...

  20. 40 CFR 88.103-94 - Abbreviations.

    Code of Federal Regulations, 2012 CFR

    2012-07-01

    ...The abbreviations in this section apply to all of part 88. ALVW—Adjusted Loaded Vehicle Weight CO—Carbon Monoxide HCHO—Formaldehyde HC—Hydrocarbon HDV—Heavy-Duty Vehicle LDT—Light-Duty Truck LDV—Light-Duty Vehicle...

  1. 40 CFR 88.103-94 - Abbreviations.

    Code of Federal Regulations, 2014 CFR

    2014-07-01

    ...The abbreviations in this section apply to all of part 88. ALVW—Adjusted Loaded Vehicle Weight CO—Carbon Monoxide HCHO—Formaldehyde HC—Hydrocarbon HDV—Heavy-Duty Vehicle LDT—Light-Duty Truck LDV—Light-Duty Vehicle...

  2. The WSR-88D Rainfall Algorithm

    Microsoft Academic Search

    Richard A. Fulton; Jay P. Breidenbach; Dong-Jun Seo; Dennis A. Miller; Timothy O’Bannon

    1998-01-01

    A detailed description of the operational WSR-88D rainfall estimation algorithm is presented. This algorithm, called the Precipitation Processing System, produces radar-derived rainfall products in real time for forecasters in support of the National Weather Service's warning and forecast missions. It transforms reflectivity factor measurements into rainfall accumulations and incorporates rain gauge data to improve the radar estimates. The products are

  3. C5a Receptor (CD88) Blockade Protects against MPO-ANCA GN

    PubMed Central

    Xiao, Hong; Dairaghi, Daniel J.; Powers, Jay P.; Ertl, Linda S.; Baumgart, Trageen; Wang, Yu; Seitz, Lisa C.; Penfold, Mark E.T.; Gan, Lin; Hu, Peiqi; Lu, Bao; Gerard, Norma P.; Gerard, Craig; Schall, Thomas J.; Jaen, Juan C.; Falk, Ronald J.

    2014-01-01

    Necrotizing and crescentic GN (NCGN) with a paucity of glomerular immunoglobulin deposits is associated with ANCA. The most common ANCA target antigens are myeloperoxidase (MPO) and proteinase 3. In a manner that requires activation of the alternative complement pathway, passive transfer of antibodies to mouse MPO (anti-MPO) induces a mouse model of ANCA NCGN that closely mimics human disease. Here, we confirm the importance of C5aR/CD88 in the mediation of anti-MPO–induced NCGN and report that C6 is not required. We further demonstrate that deficiency of C5a-like receptor (C5L2) has the reverse effect of C5aR/CD88 deficiency and results in more severe disease, indicating that C5aR/CD88 engagement enhances inflammation and C5L2 engagement suppresses inflammation. Oral administration of CCX168, a small molecule antagonist of human C5aR/CD88, ameliorated anti-MPO–induced NCGN in mice expressing human C5aR/CD88. These observations suggest that blockade of C5aR/CD88 might have therapeutic benefit in patients with ANCA-associated vasculitis and GN. PMID:24179165

  4. Outcome of erbium:yttrium aluminium garnet laser resurfacing treatments.

    PubMed

    Cole, R P; Widdowson, D; Moore, J C

    2008-10-01

    Erbium:yttrium aluminium garnet (erbium:YAG) laser treatment was used to resurface skin abnormalities in patients suffering from conditions that included epidermal naevi, tuberous sclerosis, angiofibromata, neurofibromatosis, and scarring caused by acne or other means. Patients completed self-report questionnaires before their first laser test patch session, and again approximately 4 months after one treatment, so that its success could be evaluated from the patient's perspective. Disability and distress were quantified with the University of York Health Measurement Questionnaire (HMQ). Satisfaction with appearance was measured with a specifically designed Salisbury Appearance Scale (SAS) questionnaire. Pretreatment questionnaires were completed by 108 (HMQ) and 80 (SAS) patients. Thirty-six (HMQ) and 22 (SAS) patients completed a full treatment during the study period. Some patients had a test patch only during the study period. Others decided against further treatment after the test patch. Control SAS questionnaires were completed by 29 subjects on two occasions and showed no change over time. There was a significant improvement in patient satisfaction with appearance (SAS), but there was no significant difference in the disability and distress (HMQ) after erbium:YAG resurfacing. PMID:18074165

  5. Low-voltage cathodoluminescence of europium-activated yttrium orthovanadate

    SciTech Connect

    Phillips, M.L.F.

    1995-03-01

    Emissive flat panel display systems operating in full color demand higher performance at low voltages (ca. 501000 V) from cathodoluminescent (CL) phosphors than cathode ray tubes require. Hydrothermal synthesis has been suggested as a route to phosphors with improved efficiencies, lower voltage thresholds, and increased saturation power. This hypothesis was tested in europium-doped yttrium orthovanadate (YVO{sub 4}:Eu), an efficient, red emitting CL phosphor. The CL efficiency of YVO{sub 4}:Eu crystallized from aqueous solution at 200{degrees}C is relatively low until it is annealed. The distribution of particle sizes in the low-temperature phosphor is similar to that in material made via a solid-state route, but crystallites remain much smaller (ca. 400 {Angstrom}) until they are annealed. These observations, along with the anomalously strong dependence of CL intensity on europium concentration, support a model in which efficiency principally depends on crystallite size. CL efficiency of both solid state and hydrothermal YVO{sub 4}:Eu increases with voltage at constant power. Surface-bound electrons are likely the dominant influence on efficiency at voltages near threshold. Saturation power is independent of synthetic route. It is apparent that the CL properties of hydrothermally synthesized YVO{sub 4}:Eu are essentially the same as those of YVO{sub 4}:Eu produced via conventional, high-temperature routes.

  6. Structural and electrical properties of zirconium doped yttrium oxide nanostructures

    NASA Astrophysics Data System (ADS)

    Bahari, Ali; Ebrahimzadeh, Masoud; Gholipur, Reza

    2014-04-01

    A synthetic process for the formation of ZrxY1-xOy nanostructures is demonstrated by the reaction of yttrium nitrate hexahydrate with zirconium propoxide. The reactions are carried out at temperature 60°C and pressure 0.1 MPa. The energy dispersive X-ray (EDX) spectroscopy measurements confirm formation of ZrxY1-xOy nanostructures and the presence of carbonate and hydroxide species which are removed after high temperature anneals. It was found that the oxygen pressure during synthesis plays a determinant role on the structural properties of the nanostructure. This effect is further studied by atomic force microscopy (AFM) measurements and scanning electron microscope (SEM), which showed the formation of an isotopically organized structure. X-ray diffraction (XRD) measurement reveals that these changes in the nanostructural efficiency are associated with structural and compositional changes among the substrate. The dielectric constant as measured by the capacitance-voltage (C-V) technique is estimated to be around 39.05. C-V measurements taken at 1 MHz show the maximum capacitance for the Zr0.05Y0.95Oy film. The leakage current densities were below 10-5 A/cm2 for the Zr0.05Y0.95Oy film.

  7. Shape evolution in yttrium and niobium neutron-rich isotopes

    SciTech Connect

    Rodriguez-Guzman, R.; Sarriguren, P. [Instituto de Estructura de la Materia, Consejo Superior de Investigaciones Cientificas, Serrano 123, E-28006 Madrid (Spain); Robledo, L. M. [Departamento de Fisica Teorica, Modulo 15, Universidad Autonoma de Madrid, E-28049 Madrid (Spain)

    2011-04-15

    The isotopic evolution of the ground-state nuclear shapes and the systematics of one-quasiproton configurations are studied in neutron-rich odd-A yttrium and niobium isotopes. We use a self-consistent Hartree-Fock-Bogoliubov formalism based on the Gogny energy density functional with two parametrizations, D1S and D1M. The equal-filling approximation is used to describe odd-A nuclei preserving both axial and time-reversal symmetries. Shape-transition signatures are identified in the N=60 isotopes in both the charge radii and spin parities of the ground states. These signatures are a common characteristic for nuclei in the whole mass region. The nuclear deformation and shape coexistence inherent to this mass region are shown to play a relevant role in the understanding of the spectroscopic features of the ground and low-lying one-quasiproton states. Finally, a global picture of the neutron-rich A{approx}100 mass region from krypton up to molybdenum isotopes is illustrated with the systematics of the nuclear charge radii isotopic shifts.

  8. Structure and thermal properties of yttrium alumino-phosphate glasses

    NASA Astrophysics Data System (ADS)

    Martin, Richard A.; Salmon, Philip S.; Carroll, Donna L.; Smith, Mark E.; Hannon, Alex C.

    2008-03-01

    The structure and thermal properties of yttrium alumino-phosphate glasses, of nominal composition (Y2O3)0.31-z(Al2O3)z(P2O5)0.69 with 0 \\lesssim z \\lesssim 0.31 , were studied by using a combination of neutron diffraction, 27Al and 31P magic angle spinning nuclear magnetic resonance, differential scanning calorimetry and thermal gravimetric analysis methods. The Vickers hardness of the glasses was also measured. The data are compared to those obtained for pseudo-binary Al2O3-P2O5 glasses and the structure of all these materials is rationalized in terms of a generic model for vitreous phosphate materials in which Y3+ and Al3+ act as modifying cations that bind only to the terminal (non-bridging) oxygen atoms of PO4 tetrahedra. The results are used to help elucidate the phenomenon of rare-earth clustering in phosphate glasses which can be reduced by substituting Al3+ ions for rare-earth R3+ ions at fixed modifier content.

  9. Yttrium-90 Microspheres: A Review of Its Emerging Clinical Indications

    PubMed Central

    Khajornjiraphan, Natthida; Thu, Nyein Aye; Chow, Pierce Kah Hoe

    2015-01-01

    Background Many patients with liver malignancies are not candidates for resection, and systemic therapies are often not effective. Radioembolization (RE) is an alternative treatment for this group of patients. The safety and efficacy of RE with yttrium 90 (Y90) in patients with hepatocellular carcinoma (HCC) or metastatic colon cancer to the liver have been proven in several studies. However, fewer studies have focussed on the safety and efficacy of RE with Y90 in other extrahepatic primary and secondary liver cancers. The effect on outcomes of concomitant use of Y90 with a systemic therapy is still currently under investigation. Summary A review of the published data on the use of RE as stand-alone, concomitant or sequential with other treatment modalities in HCC and other primary and secondary liver cancer is reported here. Key message RE for the treatment of HCC and other extrahepatic, primary and secondary liver cancer has reasonable efficacy and acceptable toxicities. Definitive studies to establish the role of RE in the treatment of such malignancies are warranted. PMID:26020025

  10. Nanoscale inhomogeneities in yttrium-barium-copper-oxide (YBCO) superconductors

    NASA Astrophysics Data System (ADS)

    Islam, Zahirul; Sinha, S. K.; Lang, J. C.; Liu, X.; Haskel, D.; Moss, S. C.; Srajer, G.; Veal, B. W.; Wermeille, D.; Lee, D. R.; Haeffner, D. R.; Welp, U.; Wochner, P.

    2004-03-01

    X-ray diffraction studies at the Advanced Photon Source reveal that nanoscale inhomogeneities, electronic or structural in origin, form in yttrium-barium-copper-oxide (YBa_2Cu_3O_6+x) superconductors and coexist with the superconducting (SC) state. Diffuse scattering from these inhomogeneous superstructures is due to atomic displacements with respect to equilibrium lattice sites (Z. Islam et al. Phys. Rev. B 66, 92501 (2002)), that are characterized by a wavevector of the form q=(q_x,0,0), where qx varies with hole doping from 2 unit cells (along shorter Cu-O-Cu direction) for very low doping to 4 unit cells at optimal doping. Interestingly, while these superstructures are 3-dimensionally ordered when the SC state is weakened (e.g., at x=0.4), as the doping increases, they become quasi 1D with correlation lengths comparable to SC coherence lengths in these cuprates. Recent first-principles calculations (D. de Fontaine et al., to be published) for the x=0.63 compound show that atomic displacements consistent with experimental data can be the result of ordering of O vacancies in YBCO. Models for various superstructures and their role in the phase diagram will be discussed.

  11. Comparison of two yttrium-90 regimens in inflammatory and osteoarthropathies.

    PubMed Central

    Will, R; Laing, B; Edelman, J; Lovegrove, F; Surveyor, I

    1992-01-01

    Two yttrium-90 (90Y) radiosynovectomy procedures were compared. One procedure, performed at the Royal Perth Rehabilitation Hospital (RPRH) required a shorter immobilisation time than that performed at the Sir Charles Gardiner Hospital (SCGH). There were no significant differences in outcome between the two procedures for the groups with inflammatory and osteoarthropathy. Thirty two patients (45 joints) with inflammatory arthropathy were treated (25 with rheumatoid arthritis, three with psoriatic arthritis, two with ankylosing spondylitis, and two with unspecified inflammatory arthropathy) and 40 patients (58 joints) with osteoarthropathy. A separate assessment of local lymph node spread in patients treated by the RPRH showed a minor spread of 90Y in one of 37 joints assessed. A marked improvement in the patient evaluation scores in the inflammatory arthropathy group at three months persisted at 12 months. Good lasting responses were more common in patients with inflammatory arthropathy with a normal joint or early radiological disease. A marked improvement in the pain and evaluation scores occurred at three months in the group with osteoarthropathy but had disappeared by six months after treatment. PMID:1550415

  12. Optical and structural characterization of yttrium calcium borate glasses

    NASA Astrophysics Data System (ADS)

    Santos, Cristiane; Meneses, Domingos D. S.; Echegut, Patrick; Neuville, Daniel R.; Hernandes, Antonio C.; Ibanez, Alain

    2010-03-01

    Structural and optical properties of new stable glasses in the Y2O3 -- CaO -- B2O3 system, containing the same Y/Ca ratio as the YCa4O(BO3)3 (YCOB) crystal, were determined from Raman and reflectance infrared spectroscopy [1]. We have obtained the optical functions using a dielectric function model and their evolution with composition are associated with an increase in the number of non-bridging oxygen and to calcium/yttrium oxides content with the formation of pentaborate, metaborate, orthoborate and pyroborate groups. The orthoborate and pyroborate signatures increase with increasing the modifier cations. Refractive indexes values (from 1.597 to 1.627 at ? = 2 ?m) are in good agreement with those of the YCOB crystal, an indication that these glasses are potential candidates for doping with rare-earth ions for optical applications. [4pt] [1] C. N. Santos, D.D.S. Meneses, P. Echegut, D. R. Neuville, A. C. Hernandes, A. Ibanez, Appl. Phys. Lett. 94, 151901(2009).

  13. (Data in metric tons of yttrium oxide (Y2O3) content, unless noted) Domestic Production and Use: The rare-earth element, yttrium, was mined by one company as a constituent of the

    E-print Network

    ores and concentrates (monazite) 2612.20.0000 Free Free. Rare-earth metals, scandium and yttrium Production and Use: The rare-earth element, yttrium, was mined by one company as a constituent of the mineral bastnasite, but was not recovered as a separate element during processing. Bastnasite, a rare-earth

  14. (Data in metric tons of yttrium oxide (Y2O3) content, unless otherwise noted) Domestic Production and Use: The rare-earth element, yttrium, was mined as a constituent of the mineral

    E-print Network

    .20.0000 Free. Rare-earth metals, scandium and yttrium, whether or not intermixed or interalloyed 2805.30.0000 5 Production and Use: The rare-earth element, yttrium, was mined as a constituent of the mineral bastnasite, but was not recovered as a separate element during processing. Bastnasite, a rare-earth fluocarbonate mineral, was mined

  15. (Data in metric tons of yttrium oxide (Y2O3) content, unless otherwise noted) Domestic Production and Use: The rare-earth element yttrium was not mined in the United States in 2003.

    E-print Network

    Relations 12/31/03 Thorium ores and concentrates (monazite) 2612.20.0000 Free. Rare-earth metals, scandium Production and Use: The rare-earth element yttrium was not mined in the United States in 2003. Yttrium and compounds containing by weight >19% to rare-earth compounds, including

  16. (Data in metric tons of yttrium oxide (Y2O3) content unless otherwise noted) Domestic Production and Use: The rare-earth element yttrium was not mined in the United States in 2008. All

    E-print Network

    12-31-08 Thorium ores and concentrates (monazite) 2612.20.0000 Free. Rare-earth metals, scandium Production and Use: The rare-earth element yttrium was not mined in the United States in 2008. All yttrium and compounds containing by weight >19% to rare-earth compounds, including

  17. (Data in metric tons of yttrium oxide (Y O ) content, unless otherwise noted)2 3 Domestic Production and Use: The rare-earth element, yttrium, was mined as a constituent of the mineral bastnasite,

    E-print Network

    /31/98 Thorium ores and concentrates (monazite) 2612.20.0000 Free Free. Rare-earth metals, scandium and yttrium Domestic Production and Use: The rare-earth element, yttrium, was mined as a constituent of the mineral bastnasite, but was not recovered as a separate element during processing. Bastnasite, a rare-earth

  18. (Data in metric tons of yttrium oxide (Y O ) content, unless otherwise noted)2 3 Domestic Production and Use: The rare-earth element, yttrium, was mined by one company as a constituent of the

    E-print Network

    .20.0000 Free Free. Rare-earth metals, scandium and yttrium, whether or not intermixed or interalloyed 2805 Domestic Production and Use: The rare-earth element, yttrium, was mined by one company as a constituent of the mineral bastnasite, but was not recovered as a separate element during processing. Bastnasite, a rare-earth

  19. (Data in metric tons of yttrium oxide (Y2O3) content, unless otherwise noted) Domestic Production and Use: The rare-earth element yttrium was mined as a constituent of the mineral bastnasite,

    E-print Network

    and concentrates (monazite) 2612.20.0000 Free. Rare-earth metals, scandium and yttrium, whether or not intermixed Production and Use: The rare-earth element yttrium was mined as a constituent of the mineral bastnasite, but was not recovered as a separate element during processing. Bastnasite, a rare-earth fluocarbonate mineral, was mined

  20. (Data in metric tons of yttrium oxide (Y O ) content, unless otherwise noted)2 3 Domestic Production and Use: The rare-earth element, yttrium, was mined by one company as a constituent of the

    E-print Network

    /31/96 Thorium ores and concentrates (monazite) 2612.20.0000 Free Free. Rare-earth metals, scandium and yttrium Domestic Production and Use: The rare-earth element, yttrium, was mined by one company as a constituent of the mineral bastnasite, but was not recovered as a separate element during processing. Bastnasite, a rare-earth

  1. Yttrium-doped cobalt nanoferrites prepared by sol-gel combustion method and its characterization.

    PubMed

    Shobana, M K; Nam, Wonjong; Choe, Heeman

    2013-05-01

    Ferrites are extremely important magnetic ceramics in the production of electronic components because they reduce the energy losses by the induced currents acting as electrical insulators. Similarly, the spinel-structured cobalt-based ferrites are promising materials for stress, torsion sensors and energy storage applications (anode materials in lithium batteries, fuel cells and solar cells). Therefore, many studies have focused on cobalt ferrites obtained using conventional techniques. Different sintering conditions, types and levels of substitution result in different microstructures and magnetostriction coefficients under a wide range of preparation conditions. Despite many attempts, there are no specific reports on the trivalent substitution of yttrium in cobalt ferrite to the best of our knowledge. In the present study, yttrium-doped cobalt ferrite was prepared with different concentrations to identify the crystallite size with respect to the yttrium concentration, temperature and changes in the structural and electrical properties. In addition, the resistance of the nanostructured yttrium-doped cobalt ferrites nanopowders was analyzed. The resistance was increased by the addition of yttrium to cobalt ferrites. PMID:23858896

  2. Hydrothermal synthesis and formation mechanism of hexagonal yttrium hydroxide fluoride nanobundles

    SciTech Connect

    Tian, Li, E-mail: tianli_cl@163.com [Department of Material Science and Engineering, School of Chemistry and Chemical Engineering, Hunan University of Science and Technology, Xiangtan 411201 (China); State Key Laboratory of Rare Earth Resource Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022 (China); Sun, QiLiang; Zhao, RuiNi; He, HuiLin; Xue, JianRong [Department of Material Science and Engineering, School of Chemistry and Chemical Engineering, Hunan University of Science and Technology, Xiangtan 411201 (China); Lin, Jun [State Key Laboratory of Rare Earth Resource Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022 (China)

    2013-11-15

    Graphical abstract: The formation of yttrium hydroxide fluorides nanobundles can be expressed as a precipitation transformation from cubic NaYF{sub 4} to hexagonal NaYF{sub 4} and to hexagonal Y(OH){sub 2.02}F{sub 0.98} owing to ion exchange. - Highlights: • Novel Y(OH){sub 2.02}F{sub 0.98} nanobundles have been successfully prepared by hydrothermal method. • The branched nanobundles composed of numerous oriented-attached nanoparticles has been studied. • The growth mechanism is proposed to be ion exchange and precipitation transformation. - Abstract: This article presents the fabrication of hexagonal yttrium hydroxide fluoride nanobundles via one-pot hydrothermal process, using yttrium nitrate, sodium hydroxide and ammonia fluoride as raw materials to react in propanetriol solvent. The X-ray diffraction pattern clearly reveals that the grown product is pure yttrium hydroxide fluoride, namely Y(OH){sub 2.02}F{sub 0.98}. The morphology and microstructure of the synthesized product is testified to be nanobundles composed of numerous oriented-attached nanoparticles as observed from the field emission scanning electron microscopy (FESEM). The chemical composition was analyzed by the energy dispersive spectrum (EDS), confirming the phase transformation of the products which was clearly consistent with the result of XRD analysis. It is proposed that the growth of yttrium hydroxide fluoride nanobundles be attributed to ion exchange and precipitation transformation.

  3. Cerium and yttrium oxide nanoparticles against lead-induced oxidative stress and apoptosis in rat hippocampus.

    PubMed

    Hosseini, Asieh; Sharifi, Ali Mohammad; Abdollahi, Mohammad; Najafi, Rezvan; Baeeri, Maryam; Rayegan, Samira; Cheshmehnour, Jamshid; Hassani, Shokoufeh; Bayrami, Zahra; Safa, Majid

    2015-03-01

    Due to numerous industrial applications, lead has caused widespread pollution in the environment; it seems that the central nervous system (CNS) is the main target for lead in the human body. Oxidative stress and programmed cell death in the CNS have been assumed as two mechanisms related to neurotoxicity of lead. Cerium oxide (CeO2) and yttrium oxide (Y2O3) nanoparticles have recently shown antioxidant effects, particularly when used together, through scavenging the amount of reactive oxygen species (ROS) required for cell apoptosis. We looked into the neuroprotective effects of the combinations of these nanoparticles against acute lead-induced neurotoxicity in rat hippocampus. We used five groups in this study: control, lead, CeO2 nanoparticles + lead, Y2O3 nanoparticles + lead, and CeO2 and Y2O3 nanoparticles + lead. Nanoparticles of CeO2 (1000 mg/kg) and Y2O3 (230 mg/kg) were administered intraperitoneally during 2 days prior to intraperitoneal injection of the lead (25 mg/kg for 3 days). At the end of the treatments, oxidative stress markers, antioxidant enzymes activity, and apoptosis indexes were investigated. The results demonstrated that pretreatments with CeO2 and/or Y2O3 nanoparticles recovered lead-caused oxidative stress markers (ROS, lipid peroxidation, and total thiol molecules) and apoptosis indexes (Bax/Bcl-2 and caspase-3 protein expression). Besides, these nanoparticles reduced the activities of lead-induced superoxide dismutase and catalase as well as the ADP/ATP ratio. Interestingly, the best recovery resulted from the compound of these nanoparticles. Based on these outcomes, it appears that this combination may potentially be beneficial for protection against lead-caused acute toxicity in the brain through improving the oxidative stress-mediated programmed cell death pathway. PMID:25516117

  4. Morphological and luminescent studies on nanosized Er, Yb–Yttrium oxide up-converter prepared from different precursors

    Microsoft Academic Search

    Ana Maria Pires; Osvaldo Antonio Serra; Marian Rosaly Davolos

    2005-01-01

    In this paper, we report luminescent and morphological studies with yttrium oxide samples doped with ytterbium and erbium. The samples were prepared by the combustion method and also from different precursors: oxalate, basic carbonate and polymeric resin. All powders were identified as being an yttrium oxide with a C-form structure, independent of the employed precursor. From mean crystallite size measurements,

  5. A randomized controlled trial of peeling and aspiration of Elschnig pearls and neodymium: yttrium-aluminium-garnet laser capsulotomy

    PubMed Central

    Bhargava, Rahul; Kumar, Prachi; Sharma, Shiv Kumar; Kaur, Avinash

    2015-01-01

    AIM To compare surgical peeling and aspiration and neodymium yttrium garnet laser capsulotomy for pearl form of posterior capsule opacification (PCO). METHODS A prospective, randomized, double blind, study was done at Rotary Eye Hospital, Maranda, Palampur, India, Santosh Medical College Hospital, Ghaziabad, India and Laser Eye Clinic, Noida India. Consecutive patients with pearl form of PCO following surgery, phacoemulsification, manual small incision cataract surgery and conventional extracapsular cataract extraction (ECCE) for age related cataract, were randomized to have peeling and aspiration or neodymium yttrium garnet laser capsulotomy. Corrected distance visual acuity (CDVA), intra-operative and post-operative complications were compared. RESULTS A total of 634 patients participated in the study, and 314 (49.5%) patients were randomized to surgical peeling and aspiration group and 320 (50.5%) to the Nd:YAG laser group. The mean pre-procedural logMAR CDVA in peeling and neodymium: yttrium-aluminium-garnet (Nd:YAG) laser group was 0.80±0.25 and 0.86±0.22, respectively. The mean final CDVA in peeling group (0.22±0.23) was comparable to Nd:YAG group (0.24±0.28; t test, P=0.240). There was a significant improvement in vision after both the procedures (P<0.001). A slightly higher percentage of patients in Nd:YAG laser group (283/88.3%) than in peeling group (262/83.4%) had a CDVA of 0.5 (20/63) or better at 9mo (P<0.001). On the contrary, patients having CDVA worse than 1.00 (20/200) was also significantly higher in Nd:YAG laser group as compared to peeling group (25/7.7% vs 15/4.7%, respectively). On application of ANCOVA, there was less than 0.001% risk that PCO thickness and total laser energy had no effect on rate of complications in Nd:YAG laser group and less than 0.001 % risk that PCO thickness had no effect on complications in peeling group respectively. Sum of square analysis suggests that in the Nd:YAG laser group, thick PCO had a stronger impact on complications (Fischer test probability, Pr<0.0001) than thin PCO and total laser energy (Fischer test probability, Pr<0.002), respectively; similarly, in peeling group, thick PCO and preoperative vision had a stronger effect on complications than thin PCO, respectively (Fischer test probability, Pr<0.001).The rate of complications like uveitis (P=0.527) and cystoid macular edema (P=0.068), did not differ significantly between both the groups. However, intraocular pressure spikes (P=0.046) and retinal detachment (P<0.001) were significantly higher in Nd:YAG laser group as compared to peeling group. Retinal detachment was more common in patients having degenerative myopia (7/87.5%, P<0.001). Recurrence of pearls was the most common cause of reduction of vision in the peeling group (24/7.6%, P<0.001). CONCLUSION There is no alternative to Nd:YAG laser capsulotomy for fibrous subtype of PCO. For pearl form of PCO, both techniques are comparable with regard to visual outcomes. Nd:YAG laser capsulotomy has a higher incidence of IOP spikes and retinal detachment whereas recurrence of pearls may occur after successful peeling and aspiration. When posterior capsulotomy is needed in patients with retinal degenerations, retinopathies and pre-existing retinal breaks, the clinician should be cautious about increased risks of possible complications of Nd:YAG laser capsulotomy. PMID:26086014

  6. STS-88 crew members and technicians participate in their CEIT in the SSPF

    NASA Technical Reports Server (NTRS)

    1997-01-01

    STS-88 crew members and Boeing Manufacturing Engineer Harry Feinberg enjoy a moment inside Node 1 of the International Space Station (ISS) during the mission's Crew Equipment Interface Test (CEIT) in KSC's Space Station Processing Facility. Discussing the mission are, from left to right, Feinberg, Commander Bob Cabana, Mission Specialist Nancy Currie, and Pilot Rick Sturckow. The CEIT gives astronauts an opportunity to get a hands-on look at the payloads with which they will be working on-orbit. STS-88, the first ISS assembly flight, is targeted for launch in July 1998 aboard Space Shuttle Endeavour.

  7. MyD88 mediated inflammatory signaling leads to CaMKII oxidation, cardiac hypertrophy and death after myocardial infarction.

    PubMed

    Singh, Madhu V; Swaminathan, Paari D; Luczak, Elizabeth D; Kutschke, W; Weiss, Robert M; Anderson, Mark E

    2012-05-01

    The toll-like receptors (TLR) and myocardial infarction (MI) promote NF-?B-dependent inflammatory transcription and oxidative injury in myocardium. The multifunctional Ca(2+)/calmodulin-dependent protein kinase II (CaMKII) is activated by oxidation and contributes to NF-?B-dependent transcription, myocardial hypertrophy and post-MI death. The myeloid differentiation protein 88 (MyD88) is an adapter protein critical for many TLR functions, but downstream targets for TLR/MyD88 signaling in MI are not well understood. We asked if CaMKII and TLR/MyD88 pathways are interconnected and if TLR/MyD88 contributes to adverse outcomes after MI. Here we show that TLR-4 activation by lipopolysaccharide (LPS) induces CaMKII oxidation (ox-CaMKII) in cardiomyocytes. MI enhances ox-CaMKII in wild type (WT) hearts but not in MyD88(-/-) hearts that are defective in MyD88-dependent TLR signaling. In post-MI WT hearts expression of pro-inflammatory genes TNF-? (Tnfa), complement factor B (Cfb), myocyte death and fibrosis were significantly increased, but increases were significantly less in MyD88(-/-) hearts after MI. MyD88(-/-) cardiomyocytes were defective in NF-?B activation by LPS but not by the MyD88-independent TLR agonist poly(I:C). In contrast, TNF-? induced Cfb gene expression was not deficient in MyD88(-/-) cardiomyocytes. Several hypertrophy marker genes were upregulated in both WT and MyD88(-/-) hearts after MI, but Acta1 was significantly attenuated in MyD88(-/-) hearts, suggesting that MyD88 selectively affects expression of hypertrophic genes. Post-MI cardiac hypertrophy, inflammation, apoptosis, ox-CaMKII expression and mortality were significantly reduced in MyD88(-/-) compared to WT littermates. These data suggest that MyD88 contributes to CaMKII oxidation and is important for adverse hypertrophic and inflammatory responses to LPS and MI. PMID:22326848

  8. Production and quality control of radioactive yttrium microspheres for medical applications.

    PubMed

    Ghahramani, M R; Garibov, A A; Agayev, T N

    2014-02-01

    In this paper, a method for production of yttrium silicate microspheres is reported. Yttrium silicate microspheres with approximate sizes of 20-50µm were obtained when an aqueous solution of Y(NO3)3 was added to tetraethyl orthosilicate (TEOS) and was pumped into silicone oil under constant stirring. The shapes of the particles produced by the proposed method were regular and nearly spherical. The spherical shapes, composition and element distribution were investigated by scanning electron microscopy (SEM), carbon/sulfur analysis and SEM/EDS mapping analysis. Paper chromatography was used to identify radiochemical impurities in the radioactive microspheres. The radionuclide purity was determined using a gamma spectrometry system and an ultra-low-level liquid scintillation spectrometer. The results indicated that the proposed silicone oil spheroidization method is suitable for the production of yttrium silicate microspheres. PMID:24389532

  9. Impairment of lymphocyte function following yttrium-90 DOTATOC therapy.

    PubMed

    Barsegian, Vahé; Hueben, Christian; Mueller, Stefan P; Poeppel, Thorsten D; Horn, Peter A; Bockisch, Andreas; Lindemann, Monika

    2015-06-01

    The radiolabeled somatostatin analogue, yttrium-90 DOTA-D-Phe(1)-Tyr(3)-octreotide (DOTATOC), is currently applied to treat advanced somatostatin receptor-positive tumors, e.g., neuroendocrine tumors of the pancreas, lung or gut. However, effects of this treatment on antimicrobial immune responses are not yet defined. In 20 patients treated with DOTATOC, cellular in vitro immune function was determined. Their antimicrobial lymphocyte responses were assessed by lymphocyte transformation test and enzyme-linked immunospot-measuring lymphocyte proliferation and on a single cell level production of pro- and anti-inflammatory cytokines (interferon-? and interleukin-10)-prior to therapy, at day 1, day 7 and day 90 post-therapy. Proliferative lymphocyte responses and interferon-? production after in vitro stimulation with microbial antigens were non-significantly suppressed at day 1 and significantly (p < 0.05) at day 7 versus pre-therapy. In vitro immune responses did not fully recover until day 90. In contrast, at day 1 interleukin-10 production was significantly (p < 0.05) increased. Taken together, we observed a decrease in pro-inflammatory immune responses after DOTATOC therapy. Patients with versus without bone metastases displayed significantly (p < 0.05) lower cellular immune responses toward several microbial antigens. Progressive disease and higher tumor burden could also be defined as factors associated with impaired immune function. Spearman correlation analysis indicated that cellular in vitro immunity was positively correlated with kidney function; better kidney function led to stronger immune responses. In conclusion, DOTATOC therapy caused a decrease in in vitro immune responses against microorganisms. The clinical impact needs to be evaluated in further studies. PMID:25822768

  10. Peptoid-ligated pentadecanuclear yttrium and dysprosium hydroxy clusters.

    PubMed

    Thielemann, Dominique T; Wagner, Anna T; Lan, Yanhua; Oña-Burgos, Pascual; Fernández, Ignacio; Rösch, Esther S; Kölmel, Dominik K; Powell, Annie K; Bräse, Stefan; Roesky, Peter W

    2015-02-01

    A new family of pentadecanuclear coordination cluster compounds (from now on simply referred to as clusters) [{Ln15 (OH)20 (PepCO2 )10 (DBM)10 Cl}Cl4 ] (PepCO2 =2-[{3-(((tert-butoxycarbonyl)amino)methyl)benzyl}amino]acetate, DBM=dibenzoylmethanide) with Ln=Y and Dy was obtained by using the cell-penetrating peptoid (CPPo) monomer PepCO2 H and dibenzoylmethane (DBMH) as supporting ligands. The combination of an inorganic cluster core with an organic cell-penetrating peptoid in the coordination sphere resulted in a core component {Ln15 (?3 -OH)20 Cl}(24+) (Ln=Y, Dy), which consists of five vertex-sharing heterocubane {Ln4 (?3 -OH)4 }(8+) units that assemble to give a pentagonal cyclic structure with one Cl atom located in the middle of the pentagon. The solid-state structures of both clusters were established by single-crystal X-ray crystallography. MS (ESI) experiments suggest that the cluster core is robust and maintained in solution. Pulsed gradient spin echo (PGSE) NMR diffusion measurements were carried out on the diamagnetic yttrium compound and confirmed the stability of the cluster in its dicationic form [{Y15 (?3 -OH)20 (PepCO2 )10 (DBM)10 Cl}Cl2 ](2+) . The investigation of both static (dc) and dynamic (ac) magnetic properties in the dysprosium cluster revealed a slow relaxation of magnetization, indicative of single-molecule magnet (SMM) behavior below 8?K. Furthermore, the ?T product as a function of temperature for the dysprosium cluster gave evidence that this is a ferromagnetically coupled compound below 11?K. PMID:25483296

  11. High-Pressure Phase Transition in Yttrium Iron Garnet

    NASA Astrophysics Data System (ADS)

    Stan, C. V.; Wang, J.; Zouboulis, I. S.; Prakapenka, V.; Duffy, T. S.

    2014-12-01

    High-pressure investigations of rare earth transition metal oxide garnets have revealed structural and magnetic phase transitions, including pressure-induced amorphization, magnetic collapse, spin crossover transitions and metallization, as well as transformation to highly-incompressible oxides. Yttrium iron garnet (YIG), Y3Fe5O12, exhibits interesting magnetic properties, behaving as a ferrimagnet with a Néel temperature TN ~ 559 K at ambient pressure and transforming to a paramagnetic material at high temperatures. At high temperatures and pressures, it converts to a GdFeO3-type perovskite structure. However, the composition of the perovskite is debated, with two proposed reaction pathways, leading to either (Y0.75Fe0.25)FeO3-perovskite or a mixture of YFeO3-perovskite and Fe2O3. Here, we synthesized YIG-perovskite in the diamond anvil cell above 18 GPa and 1500 K at GeoSoilEnviroCARS beamline 13-ID-D of the Advanced Photon Source. NaCl was used as a quasihydrostatic pressure medium, and Au, with the Fei equation of state, was used as the pressure calibrant and laser absorber. Our measurements of the perovskite structure extend to 70 GPa with annealing at each pressure step. We do not find any iron oxide diffraction peaks after heating, indicating that the perovskite structure is likely (Y0.75Fe0.25)FeO3. We observe a previously unknown ~5% volume discontinuity in the perovskite between 44 and 50 GPa. This discontinuity is not accompanied by a change in the diffraction pattern, suggesting that the Fe in this structure undergoes a high-spin to low-spin transition. When compressing without laser heating, we confirm the amorphization of YIG starting material at 50 GPa that was previously observed by Gavriliuk et al. (2006). This amorphous material is easily converted to the low-spin perovskite upon heating above 1400 K.

  12. Anisotropic Optical-Response of Eu-doped Yttrium Orthosilicate

    NASA Technical Reports Server (NTRS)

    Liu, Huimin; Santiago, Miguel; Jia, Weiyi; Zhang, Shoudu

    1998-01-01

    Eu-doped yttrium orthosilicate (Eu(3+) : Y2SiO5) had been a subject being investigated for coherent time-domain optical memory and information processing applications since its ultraslow optical dephasing was discovered several years ago. In this crystal the weakly allowed (7)F0 - (5)D0 transition of europium ions exhibits a sufficient long dephasing time and no spectral difli.usion on a time scale of several hours at low temperature, thus an information pattern or data can be stored as a population grating in the ground state hyperfine levels. On the other hand, the study on photon-echo relaxation shows that the dephasing time T2 of Eu (3+) and other rare-earth ions doped YAG, YAlO3 strongly depends on the intensity of the excitation pulses. In Eu (3+) :YAlO3, an exponential decay of photon-echo with T2 = 53 microseconds if the excitation pulses are weak (5 vJ/pulse) was observed. However, when the excitation pulses are strong (80 pJ/pulse) they observed a much shortened T2 with a highly nonexponential decay pattern. The conclusion they derived is that the intensity-dependent dephasing rate effects are quite general, and it depends on how much the excitation intensity varies. In this paper we use transient grating formation technique showing that a temporal lattice distortion may only occur along crystal c axis, caused by EU (3+) excitation. At high excitation level the produced exciton in conduction band may also couple to the dynamical lattice relaxation process, giving rise to an apparently much shortened dephasing time.

  13. Root Cause Analysis of Gastroduodenal Ulceration After Yttrium-90 Radioembolization

    SciTech Connect

    Lam, Marnix G. E. H. [Stanford University School of Medicine, Division of Interventional Radiology (United States); Banerjee, Subhas [Stanford University School of Medicine, Division of Gastroenterology and Hepatology (United States)] [Stanford University School of Medicine, Division of Gastroenterology and Hepatology (United States); Louie, John D.; Abdelmaksoud, Mohamed H. K. [Stanford University School of Medicine, Division of Interventional Radiology (United States)] [Stanford University School of Medicine, Division of Interventional Radiology (United States); Iagaru, Andrei H. [Stanford University School of Medicine, Division of Nuclear Medicine and Molecular Imaging (United States)] [Stanford University School of Medicine, Division of Nuclear Medicine and Molecular Imaging (United States); Ennen, Rebecca E.; Sze, Daniel Y., E-mail: dansze@stanford.edu [Stanford University School of Medicine, Division of Interventional Radiology (United States)

    2013-12-15

    IntroductionA root cause analysis was performed on the occurrence of gastroduodenal ulceration after hepatic radioembolization (RE). We aimed to identify the risk factors in the treated population and to determine the specific mechanism of nontarget RE in individual cases. Methods: The records of 247 consecutive patients treated with yttrium-90 RE for primary (n = 90) or metastatic (n = 157) liver cancer using either resin (n = 181) or glass (n = 66) microspheres were reviewed. All patients who developed a biopsy-proven microsphere-induced gastroduodenal ulcer were identified. Univariate and multivariate analyses were performed on baseline parameters and procedural data to determine possible risk factors in the total population. Individual cases were analyzed to ascertain the specific cause, including identification of the culprit vessel(s) leading to extrahepatic deposition of the microspheres. Results: Eight patients (3.2 %) developed a gastroduodenal ulcer. Stasis during injection was the strongest independent risk factor (p = 0.004), followed by distal origin of the gastroduodenal artery (p = 0.004), young age (p = 0.040), and proximal injection of the microspheres (p = 0.043). Prolonged administrations, pain during administration, whole liver treatment, and use of resin microspheres also showed interrelated trends in multivariate analysis. Retrospective review of intraprocedural and postprocedural imaging showed a probable or possible culprit vessel, each a tiny complex collateral vessel, in seven patients. Conclusion: Proximal administrations and those resulting in stasis of flow presented increased risk for gastroduodenal ulceration. Patients who had undergone bevacizumab therapy were at high risk for developing stasis.

  14. Hanford isotope project strategic business analysis yttrium-90 (Y-90)

    SciTech Connect

    NONE

    1995-10-01

    The purpose of this analysis is to address the short-term direction for the Hanford yttrium-90 (Y-90) project. Hanford is the sole DOE producer of Y-90, and is the largest repository for its source in this country. The production of Y-90 is part of the DOE Isotope Production and Distribution (IP and D) mission. The Y-90 is ``milked`` from strontium-90 (Sr-90), a byproduct of the previous Hanford missions. The use of Sr-90 to produce Y-90 could help reduce the amount of waste material processed and the related costs incurred by the clean-up mission, while providing medical and economic benefits. The cost of producing Y-90 is being subsidized by DOE-IP and D due to its use for research, and resultant low production level. It is possible that the sales of Y-90 could produce full cost recovery within two to three years, at two curies per week. Preliminary projections place the demand at between 20,000 and 50,000 curies per year within the next ten years, assuming FDA approval of one or more of the current therapies now in clinical trials. This level of production would incentivize private firms to commercialize the operation, and allow the government to recover some of its sunk costs. There are a number of potential barriers to the success of the Y-90 project, outside the control of the Hanford Site. The key issues include: efficacy, Food and Drug Administration (FDA) approval and medical community acceptance. There are at least three other sources for Y-90 available to the US users, but they appear to have limited resources to produce the isotope. Several companies have communicated interest in entering into agreements with Hanford for the processing and distribution of Y-90, including some of the major pharmaceutical firms in this country.

  15. Mössbauer study of Al and Cr co-substituted Yttrium iron garnets

    NASA Astrophysics Data System (ADS)

    Murumkar, V. D.; Shengule, D. R.; Bichile, G. K.; Jadhav, K. M.

    2009-07-01

    The Mössbauer spectra of Y3Al x Cr X Fe5 - 2 x O12 ( x = 0.0 to 0.6) measured at 300 K have been fitted with two sextets in the ferrimagnetic state corresponding to Fe3+ at the octahedral (a) and the tetrahedral (d) sites for x ? 0.6. The isomer shifts (?) and quadrupole splitting (?EQ) indicate the presence of high spin Fe3+ ions in the tetrahedral (d) and octahedral (a) sites, typical of yttrium of yttrium iron garnet structure. Mössbauer results have shown that Al3+, enters a-sites only but Cr3+ enters both a-and d-sites.

  16. Surface oxide on thin films of yttrium hydride studied by neutron reflectometry

    NASA Astrophysics Data System (ADS)

    Mongstad, T.; Platzer-Björkman, C.; Mæhlen, J. P.; Hauback, B. C.; Karazhanov, S. Zh.; Cousin, F.

    2012-05-01

    The applicability of standard methods for compositional analysis is limited for H-containing films. Neutron reflectometry is a powerful, non-destructive method that is especially suitable for these systems due to the large negative scattering length of H. In this work, we demonstrate how neutron reflectometry can be used to investigate thin films of yttrium hydride. Neutron reflectometry gives a strong contrast between the film and the surface oxide layer, enabling us to estimate the oxide thickness and oxygen penetration depths. A surface oxide layer of 5-10 nm thickness was found for unprotected yttrium hydride films.

  17. Direct Observation and Calipering of the {open_quotes}Webbing{close_quotes} Fermi Surface of Yttrium

    SciTech Connect

    Dugdale, S.B.; Fretwell, H.M.; Alam, M.A. [H.H.Wills Physics Laboratory, University of Bristol,Tyndall Avenue, Bristol, BS8 1TL (United Kingdom)] [H.H.Wills Physics Laboratory, University of Bristol,Tyndall Avenue, Bristol, BS8 1TL (United Kingdom); Kontrym-Sznajd, G. [Polish Academy of Sciences, W. Trzebiatowski Intsitute of Low Temperature and Structure Research, 50-950 Wroclaw 2, P.O.Box 937 (Poland)] [Polish Academy of Sciences, W. Trzebiatowski Intsitute of Low Temperature and Structure Research, 50-950 Wroclaw 2, P.O.Box 937 (Poland); West, R.N.; Badrzadeh, S. [Department of Physics, University of Texas at Arlington, P.O.Box 19059, Arlington, Texas 76019 (United States)] [Department of Physics, University of Texas at Arlington, P.O.Box 19059, Arlington, Texas 76019 (United States)

    1997-08-01

    The first measurement of both the size and shape of the region of the Fermi surface of yttrium known as the {open_quotes}webbing{close_quotes} is reported. This particular Fermi surface feature is of considerable interest because it is very similar to that found in a number of the heavier rare earth metals, where it is believed to play a vital role in driving the exotic magnetic structures found therein. In this positron study, two-dimensional angular correlation measurements combined with three-dimensional reconstruction provide a direct image of this part of the yttrium Fermi surface. {copyright} {ital 1997} {ital The American Physical Society}

  18. Optical bistability in erbium-doped yttrium aluminum garnet crystal combined with a laser diode.

    PubMed

    Maeda, Y

    1994-01-10

    Optical bistability was observed in a simple structure of an injection laser diode combined with an erbium-doped yttrium aluminum garnet crystal. Since a hysteresis characteristic exists in the relationship between the wavelength and the injection current of a laser diode, an optical memory function capable of holding the output status is confirmed. In addition, an optical signal inversion was caused by the decrease of transmission of the erbium-doped yttrium aluminum garnet crystal against the red shift (principally mode hopping) of the laser diode. It is suggested that the switching time of this phenomenon is the time necessary for a mode hopping by current injection. PMID:20862016

  19. Nanostructured yttrium aluminum garnet powders synthesized by co-precipitation method using tetraethylenepentamine

    Microsoft Academic Search

    Xianxue LI; Wenju WANG

    2009-01-01

    Tetraethylenepentamine (C8H23N5, TEPA) has been used as a novel precipitant to synthesize yttrium aluminum garnet (Y3Al5O12, YAG) precursor from a mixed solution of aluminum and yttrium nitrates via a normal-strike co-precipitation method without controlling the pH value during precipitation process. The original precursor was analyzed by thermogravimetry\\/differential scanning calorimetry (TG\\/DSC). The evolution of phase composition and micro-structure of the as-synthesized

  20. Seltenerdelement-, Yttrium-Gehalte und Bleiisotope in Thermal und Mineralwässern des Schwarzwaldes

    Microsoft Academic Search

    Peter Möller; Ingrid Stober; Peter Dulski

    1997-01-01

    Kurzfassung  \\u000a \\u000a Seltenerdelement(SEE)- und Yttrium(Y)-Gehalte sowie Bleiisotopen-Verhltnisse wurden in den potentiellen Aquifergesteinen,\\u000a deren experimentellen Laugungslsungen und den Mineralwssern ermittelt. Fr diese Studie wurden Mineralwsser aus fnf Bohrungen\\u000a im kristallinen Grundgebirge (Granit und Gneis) des Schwarzwaldes ausgewhlt. Die Verteilung der Lanthaniden, des Yttriums\\u000a und der Bleiisotope sind geeignete Mittel, um das Gestein zu erkennen, das den Kationengehalt der Mineralwssern dominant\\u000a prgt. Gneise

  1. Synthesis of nanostructured yttrium with the use of cluster beams and investigation of the optical and electrical properties of yttrium hydride species

    NASA Astrophysics Data System (ADS)

    Stepanov, A. L.; Kreibig, U.; Reinholdt, A.; Fa?zrakhmanov, I. A.

    2009-08-01

    The preparation of new types of nanosystems based on metallic yttrium nanoparticles, which are difficult to produce by traditional methods due to the high melting temperature and the extremely high oxidizability of this metal, has been investigated. The materials are prepared on an original high-vacuum setup intended for the formation of metal nanoparticle beams by laser ablation. Yttrium nanoparticles are synthesized, and their chemical reactions with hydrogen are studied at room temperature. It is found that the reaction at low hydrogen pressures (˜10-3 Pa) leads to the formation of YH2 dihydride particles with metal properties. An increase in the hydrogen pressure to ˜100 Pa results in the transformation of metal-like YH2 nanoparticles into dielectric YH3 - x ( x < 1) nanoparticles. It is revealed that the last reaction corresponding to the metal-dielectric phase transition is reversible with respect to the pressure of the hydrogen atmosphere.

  2. Exceptional field theory. III. E[subscript 8(8)

    E-print Network

    Hohm, Olaf

    We develop exceptional field theory for E[subscript 8(8)], defined on a (3 + 248)-dimensional generalized spacetime with extended coordinates in the adjoint representation of E[subscript 8(8)]. The fields transform under ...

  3. Kiglapait geochemistry VII: Yttrium and the rare earth elements

    NASA Astrophysics Data System (ADS)

    Morse, S. A.; Nolan, K. M.

    1985-07-01

    Based on 51 wholerock analyses by XRF and summation over the layered group, the Kiglapait Intrusion contains 4.7 -1.6+1.2 ppm Y, which resides principally in augite and apatite. Using liquid compositions calculated by summation, the partition coefficient D AUG/LY is 0.95 ± 0.12 from 84 to 97 PCS (percent solidified) and 1.5 ± 0.4 above 97 PCS. For feldspar, the most likely value for D is 0.028 ± 0.02 ( N = 6). REE analyses for 13 whole rocks were interpreted with the aid of yttrium models to yield trends for wholerocks and liquids vs PCS. Summations over the rocks of the layered group gave La = 2.5, Ce = 5.8, Nd = 3.9, Sm = 1.0, Eu = 0.8, Tb = 0.17, Yb = 0.37, and Lu = 0.06 ppm, with 2 s.d. errors near ± 30%. All these elements are highly incompatible until the arrival of augite, which affects chiefly the HREE, and apatite, which affects all (but more strongly, the LREE). The net result is that after apatite arrival at 94 PCS, the liquid compositions are nearly constant, hence D REEWR/L ? 1.0. These results are compatible with the mineralogy of the intrusion and the estimated partition coefficients for feldspar, olivine, augite, apatite, and Fe-Ti oxide minerals. For pre-apatite liquids, D REEFSP/L vary regularly with the normative di content of the liquid and change by an order of magnitude, hence the bulk liquid composition must be considered in any attempt to invert the compositions of feldspars to parent liquids. The Eu anomaly at first decreases in Kiglapait liquids due to plagioclase fractionation, but then increases due to removal of augite and apatite with negative Eu anomalies. The features dominantly responsible for Eu partitioning are liquid structure and, for monoclinic ternary feldspars, crystal structure. The former is best monitored by the augite or diopside content of the liquid and the latter, by the K content of the feldspar. The chondrite-normalized REE pattern for the intrusion has LaN = 7.4, LuN = 1.6, ( Ce/Yb) N = 3.6 , and Eu/Eu? = 2.4 , indicating its feldspar-rich nature. The chilled margin of the nearby Hettasch Intrusion has a similar but more evolved pattern, corresponding roughly to the Kiglapait liquid at 70 PCS. As with other data, those for the REE suggest source differences for the two intrusions rather than a relationship due to fractionation.

  4. 36 CFR 7.88 - Indiana Dunes National Lakeshore.

    Code of Federal Regulations, 2013 CFR

    2013-07-01

    ...Public Property 1 2013-07-01 2013-07-01 false Indiana Dunes National Lakeshore. 7.88 Section 7.88 Parks...REGULATIONS, AREAS OF THE NATIONAL PARK SYSTEM § 7.88 Indiana Dunes National Lakeshore. (a) Fishing. Unless...

  5. 36 CFR 7.88 - Indiana Dunes National Lakeshore.

    Code of Federal Regulations, 2012 CFR

    2012-07-01

    ...Public Property 1 2012-07-01 2012-07-01 false Indiana Dunes National Lakeshore. 7.88 Section 7.88 Parks...REGULATIONS, AREAS OF THE NATIONAL PARK SYSTEM § 7.88 Indiana Dunes National Lakeshore. (a) Fishing. Unless...

  6. 36 CFR 7.88 - Indiana Dunes National Lakeshore.

    Code of Federal Regulations, 2011 CFR

    2011-07-01

    ...Public Property 1 2011-07-01 2011-07-01 false Indiana Dunes National Lakeshore. 7.88 Section 7.88 Parks...REGULATIONS, AREAS OF THE NATIONAL PARK SYSTEM § 7.88 Indiana Dunes National Lakeshore. (a) Fishing. Unless...

  7. 36 CFR 7.88 - Indiana Dunes National Lakeshore.

    Code of Federal Regulations, 2014 CFR

    2014-07-01

    ...Public Property 1 2014-07-01 2014-07-01 false Indiana Dunes National Lakeshore. 7.88 Section 7.88 Parks...REGULATIONS, AREAS OF THE NATIONAL PARK SYSTEM § 7.88 Indiana Dunes National Lakeshore. (a) Fishing. Unless...

  8. 29 CFR 452.88 - Resumption of good standing.

    Code of Federal Regulations, 2010 CFR

    2010-07-01

    ...2010-07-01 false Resumption of good standing. 452.88 Section 452.88 Labor...Vote § 452.88 Resumption of good standing. While it is permissible for...After a member has resumed his good-standing status, it would be...

  9. 7 CFR 800.88 - Loss of identity.

    Code of Federal Regulations, 2011 CFR

    2011-01-01

    ...2011-01-01 2011-01-01 false Loss of identity. 800.88 Section 800.88 Agriculture...and Procedures § 800.88 Loss of identity. (a) Lots. Except as...Board appeal inspection service, the identity of grain in a closed carrier or...

  10. 33 CFR 88.15 - Lights on dredge pipelines.

    Code of Federal Regulations, 2013 CFR

    2013-07-01

    ...2013-07-01 2013-07-01 false Lights on dredge pipelines. 88.15 Section 88.15 Navigation and...V: PILOT RULES § 88.15 Lights on dredge pipelines. Dredge pipelines that are floating or supported on trestles...

  11. 10 CFR 71.88 - Air transport of plutonium.

    Code of Federal Regulations, 2014 CFR

    2014-01-01

    ...2014-01-01 false Air transport of plutonium. 71.88 Section 71.88 Energy...Procedures § 71.88 Air transport of plutonium. (a) Notwithstanding the provisions...applicable, the licensee shall assure that plutonium in any form, whether for...

  12. Phase compositions in magnesium-rare earth alloys containing yttrium, gadolinium or dysprosium

    Microsoft Academic Search

    P. J. Apps; H. Karimzadeh; J. F. King; G. W. Lorimer

    2003-01-01

    Phase compositions have been investigated, using thin foil energy dispersive X-ray spectroscopy, in three magnesium-rare earth alloys, containing yttrium, gadolinium or dysprosium. Compositions are suggested for the as-cast eutectic and ? precipitate phases and possible compositions for the ?1 precipitate phases are discussed.

  13. Preliminary results on a new method for producing yttrium phosphorous microspheres.

    PubMed

    Ghahramani, M R; Garibov, A A; Agayev, T N

    2014-09-01

    This paper reports on a new method to embed phosphorus particles into the matrix of yttrium aluminum silicate microspheres. Yttrium phosphorus glass microspheres about 20µm in size were obtained when an aqueous solution of YCl3 and AlCl3 were added to tetraethyl orthosilicate (TEOS) (phosphoric acid was used to catalyze the hydrolysis and condensation of TEOS) and was pumped into silicone oil under constant stirring. The shapes of the particles produced by this method are regular and nearly spheric in shape. Paper chromatography was used to determine the radiochemical impurity of radioactive microspheres. Radionuclide purity was determined using a gamma spectrometry system and an ultra-low level liquid scintillation spectrometer. The P(+) ions implantation stage was eliminated by embedding phosphorus particles in the matrix of the glass microspheres. This paper shows that a high temperature is not required to produce yttrium phosphorus aluminum silicate microspheres. The result shows that the silicone oil spheroidization method is a very suitable way to produce yttrium phosphorus glass microspheres. The topographical analysis of microspheres shows that the Y, P, Si, and Al elements are distributed in the microspheres and the distribution of elements in the samples is homogenous. PMID:24998745

  14. Aquatic geochemistry of the rare earth elements and yttrium in the Pioneer River catchment, Australia

    Microsoft Academic Search

    Michael G. LawrenceA; Stacy D. JupiterB; Balz S. KamberC

    2006-01-01

    The rare earth elements are strong provenance indicators in geological materials, yet the potential for tracing provinciality in surface freshwater samples has not been adequately tested. Rare earth element and yttrium concentrations were measured at 33 locations in the Pioneer River catchment, Mackay, central Queensland,Australia. The rare earth element patterns were compared on the basis of geological, topographical and land-use

  15. Recyclables recovery of europium and yttrium metals and some salts from spent fluorescent lamps

    Microsoft Academic Search

    Mahmoud A. Rabah

    2008-01-01

    Europium and yttrium metals and some valuable salts were recovered from the powder coating the inner surface of the glass tubes of fluorescent lamps. The tubes were broken under 30% aqueous acetone to avoid emission of mercury vapor to the atmosphere, and the powder was collected by brushing. Metals available in the powder were pressure leached using sulfuric\\/nitric acid mixture.

  16. Near theoretical microwave loss in hot isostatic pressed (hipped) polycrystalline yttrium iron garnet

    Microsoft Academic Search

    Alexey V. Nazarov; David Me´nard; Jerome J. Green; Carl E. Patton; Gil M. Argentina; H. J. Van Hook

    2003-01-01

    The ferromagnetic resonance (FMR) linewidth, the field dependent effective linewidth, and the parallel pump spin wave linewidth were measured for spheres and disks prepared from a block of hot isostatic pressed (hipped) polycrystalline yttrium iron garnet (YIG). All linewidths as well as static magnetization data indicate close to 100% density. Vibrating sample magnetometer measurements give an average saturation induction 4?Ms

  17. Near theoretical microwave loss in hot isostatic pressed (hipped) polycrystalline yttrium iron garnet

    Microsoft Academic Search

    Alexey V. Nazarov; David Ménard; Jerome J. Green; Carl E. Patton; Gil M. Argentina; H. J. van Hook

    2003-01-01

    The ferromagnetic resonance (FMR) linewidth, the field dependent effective linewidth, and the parallel pump spin wave linewidth were measured for spheres and disks prepared from a block of hot isostatic pressed (hipped) polycrystalline yttrium iron garnet (YIG). All linewidths as well as static magnetization data indicate close to 100% density. Vibrating sample magnetometer measurements give an average saturation induction 4piMs

  18. Fabrication of yttrium oxide and erbium oxide coatings by PVD methods

    Microsoft Academic Search

    Akihiko Sawada; Akihiro Suzuki; Hans Maier; Freimut Koch; Takayuki Terai; Takeo Muroga

    2005-01-01

    The development of insulating coatings is one of the most important subjects in fusion reactor liquid lithium blanket research and development. The compounds aluminum nitride, yttrium oxide and erbium oxide are considered to be candidate materials for ceramic coatings because of their high electrical resistance and their high compatibility with liquid lithium. In the present study, two types of PVD

  19. Stability of Dispersions of Colloidal Hematite\\/Yttrium Oxide Core-Shell Particles

    Microsoft Academic Search

    R. C. Plaza; A. Quirantes; A. V. Delgado

    2002-01-01

    The colloidal stability of suspensions of hematite\\/yttria core\\/shell particles is investigated in this work and compared with that of the pure hematite cores. The different electrical surface characteristics of yttrium and iron oxides, as well as the diameters of both types of spherical particles, dominate the overall process of particle aggregation. The aggregation kinetics of the suspensions was followed by

  20. YTTRIUM BEHAVIOR IN RARE EARTH-AMINE EXTRACTION SYSTEMS AND EFFECT OF SEQUESTRANTS

    Microsoft Academic Search

    D. J. Bauer; A. C. Rice

    1962-01-01

    Solvent extraction techniques were used to determine the extraction ; sequence of Y and the rare earth elements in an amine solvent extraction system. ; Single-stage extraction with Primene 81-R resulted in separation factors of 3.8 ; between Y and Dy and 25 between Y and Ce. Yttrium was concentrated in the ; aqueous phase. EDTA and DTPA, as aqueous

  1. Growth and Characterization of Yttrium Calcium Oxy Borate (YCOB) Single Crystals for Nonlinear Optical Applications

    Microsoft Academic Search

    R. Arun Kumar; M. Senthilkumar; R. Dhanasekaran

    2008-01-01

    The growth of yttrium calcium oxy borate (YCOB) single crystals by the flux technique is reported. Polycrystalline YCOB sample was synthesized and confirmed. Differential thermal analysis was carried out with lithium carbonate flux. The growth of YCOB crystals by flux technique was attempted and several crystals with dimensions of 3×3×5 mm were obtained. Powder XRD analysis confirms the formation of YCOB

  2. Solid state battery with pure and doped sodium yttrium fluoride as the solid electrolyte

    Microsoft Academic Search

    M. Shareefuddin; M. Jamal; M. Narasimha Chary

    1995-01-01

    Solid state batteries using pure and doped sodium yttrium fluoride as the solid electrolytes were fabricated at ambient temperature. The discharge characteristics of the cells for a load of 1 M Omega were studied. The cell with NaYF4:Dy as the solid electrolyte exhibited a larger plateau region compared with the other cells. Open circuit voltage and short circuit current of

  3. Enhanced Sintering of Yttrium-Doped Barium Zirconate by Addition of ZnO

    E-print Network

    Haile, Sossina M.

    Enhanced Sintering of Yttrium-Doped Barium Zirconate by Addition of ZnO Peter Babilo and Sossina M properties of doped barium zirconate have been examined. With the use of zinc ox- ide as a sintering aid, Ba of the material under flowing CO2 showed ZnO-modified barium zirconate to exhibit excellent chemical stability

  4. PHYSICAL REVIEW B 88, 174102 (2013) Positron lifetime measurements of hydrogen passivation of cation vacancies

    E-print Network

    McCluskey, Matthew

    2013-01-01

    of cation vacancies in yttrium aluminum oxide garnets F. A. Selim,1,* C. R. Varney,1 M. C. Tarun,1 M. C oxides based on positron lifetime measurements, infrared spectroscopy, and composition analysis. Defects were characterized in samples of yttrium aluminum garnet grown in O2 or Ar. However, no positron

  5. Bacterial infections in Myd88-deficient mice.

    PubMed

    Villano, Jason S; Rong, Fang; Cooper, Timothy K

    2014-04-01

    Three breeding colonies of Myd88(-/-) mice had a history of significant morbidity and mortality. Although strain-specific poor reproductive performance might explain neonatal death and dystocia, mice were found dead or required euthanasia because of moribundity, distended abdomen, head tilt, and seizures. Histopathology results included bacteremia, placentitis, metritis, peritonitis with abscess formation, and suppurative meningoencephalitis. Intralesional gram-negative coccobacilli were present, often in extremely high number. Cultures of samples of the cardiac blood of a mouse and from water-bottle sipper tubes provided to some affected mice grew Pseudomonas aeruginosa. In addition, affected tissues from 2 mice and feces from a third tested PCR-positive for P. aeruginosa. Although the mice had received autoclaved reverse-osmosis-purified drinking water, we suspect that the mice were inoculated with P. aeruginosa through contaminated sipper tubes. Because of the deficiency in most of the Toll-like receptor signaling pathways, these Myd88(-/-) mice were unlikely to have developed competitive innate and adaptive immune responses, resulting in bacterial infections. These clinical cases underscore the importance of understanding how genotype, phenotype and environment affect animal health. Sound husbandry and experimental practices are needed to prevent the exposure of immuno-deficient mice to pathogens. PMID:24674585

  6. Bacterial Infections in Myd88-Deficient Mice

    PubMed Central

    Villano, Jason S; Rong, Fang; Cooper, Timothy K

    2014-01-01

    Three breeding colonies of Myd88?/? mice had a history of significant morbidity and mortality. Although strain-specific poor reproductive performance might explain neonatal death and dystocia, mice were found dead or required euthanasia because of moribundity, distended abdomen, head tilt, and seizures. Histopathology results included bacteremia, placentitis, metritis, peritonitis with abscess formation, and suppurative meningoencephalitis. Intralesional gram-negative coccobacilli were present, often in extremely high number. Cultures of samples of the cardiac blood of a mouse and from water-bottle sipper tubes provided to some affected mice grew Pseudomonas aeruginosa. In addition, affected tissues from 2 mice and feces from a third tested PCR-positive for P. aeruginosa. Although the mice had received autoclaved reverse-osmosis–purified drinking water, we suspect that the mice were inoculated with P. aeruginosa through contaminated sipper tubes. Because of the deficiency in most of the Toll-like receptor signaling pathways, these Myd88?/? mice were unlikely to have developed competitive innate and adaptive immune responses, resulting in bacterial infections. These clinical cases underscore the importance of understanding how genotype, phenotype and environment affect animal health. Sound husbandry and experimental practices are needed to prevent the exposure of immunodeficient mice to pathogens. PMID:24674585

  7. http://www.sjsu.edu/senate/s88-11.htm S88-11 LIBRARY CONFIDENTIALITY OF PATRON RECORDS

    E-print Network

    Gleixner, Stacy

    http://www.sjsu.edu/senate/s88-11.htm S88-11 LIBRARY CONFIDENTIALITY OF PATRON RECORDS Legislative LIBRARY CONFIDENTIALITY OF PATRON RECORDS POLICY S 88-11 1. The San Jose State University Library has Library are confidential. Such records, whether print or electronic, include but are not limited to

  8. Increased N-glycosylation of Asn88 in serum pancreatic ribonuclease 1 is a novel diagnostic marker for pancreatic cancer

    PubMed Central

    Nakata, Daisuke

    2014-01-01

    Alterations of carbohydrate structures in cancer cells are the most promising targets for developing clinical diagnostic reagents. Pancreatic cancer is one of the most difficult cancers to diagnose because it lacks definitive symptoms. Two antibodies were raised against human pancreatic ribonuclease 1 that bind to the enzyme containing unglycosylated Asn88, but not when its Asn88 is N-glycosylated. Differential studies using these antibodies in immunoassays and Western blot analyses showed a significant increase in the serum levels of pancreatic ribonuclease 1 containing N-glycosylated Asn88 in pancreatic cancer patients compared with normal human subjects. Focusing on the increase in an N-glycosylated Asn residue of serum pancreatic ribonuclease 1, specifically Asn88, affords a new diagnostic marker for pancreatic cancer. This is the first report of a diagnostic cancer marker that takes advantage of the presence or absence of N-glycosylation at a specific Asn residue of a glycoprotein. PMID:25336120

  9. Students' Target

    NASA Technical Reports Server (NTRS)

    2005-01-01

    [figure removed for brevity, see original site] Context image for PIA03648 Ascraeus Mons

    After examining numerous THEMIS images and using the JMars targeting software, eighth grade students from Charleston Middle School in Charleston, IL, selected the location of -8.37N and 276.66E for capture by the THEMIS visible camera during Mars Odyssey's sixth orbit of Mars on Nov. 22, 2005. The students are investigating relationships between channels, craters, and basins on Mars. The Charleston Middle School students participated in the Mars Student Imaging Project (MSIP) and submitted a proposal to use the THEMIS visible camera.

    Image information: VIS instrument. Latitude 8.8S, Longitude 279.6E. 17 meter/pixel resolution.

    Note: this THEMIS visual image has not been radiometrically nor geometrically calibrated for this preliminary release. An empirical correction has been performed to remove instrumental effects. A linear shift has been applied in the cross-track and down-track direction to approximate spacecraft and planetary motion. Fully calibrated and geometrically projected images will be released through the Planetary Data System in accordance with Project policies at a later time.

    NASA's Jet Propulsion Laboratory manages the 2001 Mars Odyssey mission for NASA's Office of Space Science, Washington, D.C. The Thermal Emission Imaging System (THEMIS) was developed by Arizona State University, Tempe, in collaboration with Raytheon Santa Barbara Remote Sensing. The THEMIS investigation is led by Dr. Philip Christensen at Arizona State University. Lockheed Martin Astronautics, Denver, is the prime contractor for the Odyssey project, and developed and built the orbiter. Mission operations are conducted jointly from Lockheed Martin and from JPL, a division of the California Institute of Technology in Pasadena.

  10. Rotated stripe order and its competition with superconductivity in La1.88Sr0.12CuO4

    NASA Astrophysics Data System (ADS)

    Thampy, V.; Dean, M. P. M.; Christensen, N. B.; Steinke, L.; Islam, Z.; Oda, M.; Ido, M.; Momono, N.; Wilkins, S. B.; Hill, J. P.

    2014-09-01

    We report the observation of a bulk charge modulation in La1.88Sr0.12CuO4 (LSCO) with a characteristic in-plane wave vector of (0.236,±?), with ? =0.011 r.l.u. The transverse shift of the ordering wave vector indicates the presence of rotated charge-stripe ordering, demonstrating that the charge ordering is not pinned to the Cu-O bond direction. On cooling through the superconducting transition, we find an abrupt change in the growth of the charge correlations and a suppression of the charge order parameter indicating competition between the two orderings. Orthorhombic LSCO thus helps bridge the apparent disparities between the behavior previously observed in the tetragonal "214" cuprates and the orthorhombic yttrium and bismuth-based cuprates and thus lends strong support to the idea that there is a common motif to charge order in all cuprate families.

  11. Acta Ophthalmologica: History 1970-88.

    PubMed

    Norn, Mogens

    2014-08-01

    This is my personal memories concerning the Nordic periodical Acta Ophthalmologica in the period 1970-88. Poul Braendstrup was scientific secretary for Acta 1950-70 and chief editor 1970-75. His many important scientific works and enormous work for Acta is described, but also personal topics are mentioned. Acta meetings in the Danish Ophthalmol Society (DOS) and in the Nordic ophtalmol. Congresses are discussed. A referee-system is established from 1976, but with political contra scientific motives. Only a few papers arrived to Acta. A catastrophe in 1978 is mentioned. The new secretary Ingelise Truberg did an enormous work for the next ten years. Erik Jørgensen (1928-90) was our printer, and from 1975 our idealistic publisher after Munksgaard. The economy became better and the number of papers of high quality increased. The relationship to the new Nordic periodical Oftalmolog was discussed in 1982. PMID:25043789

  12. Effect of yttrium on diffusion layer of Ni-Al-Mo-B alloy IC6 during high temperature oxidation process

    SciTech Connect

    Xiao, C.; Han, Y.

    1999-11-05

    One of the critical requirements for a protective oxide scale on an alloy substrate to provide high temperature environmental resistance is that the scale should be adherent to the substrate. A directionally solidified (DS) alloy IC6 has been recently developed as a high-temperature structural material used for advanced jet-engine blades and vanes operating in the temperature range of 1,050-1,150 C. Its high temperature oxidation resistance is substantially improved by adding proper amounts of yttrium, which is attributed to several beneficial roles played by yttrium. One of the beneficial effects is that yttrium can inhibit the transportation of cations and hence decrease the increasing rate of the depth of the diffusion layer formed during high temperature oxidation process. The purpose of this paper is to investigate the effect of yttrium on the diffusion layer.

  13. Verification of d-wave pairing symmetry by microwave intermodulation distortion measurements in yttrium barium copper oxide

    E-print Network

    Park, Sang-Hoon, Ph. D. Massachusetts Institute of Technology

    2004-01-01

    We report measurements of the temperature and power dependence of the microwave frequency intermodulation distortion (IMD) in high quality pulsed laser deposition (PLD) Yttrium Barium Copper Oxide (YBCO) on LaAlO3 substrate. ...

  14. Fabrication and electrical characterization of 15% yttrium-doped barium zirconate—nitrate freeze drying method combined with vacuum heating

    Microsoft Academic Search

    Susumu Imashuku; Tetsuya Uda; Yoshitaro Nose; Yasuhiro Awakura

    2011-01-01

    We applied a nitrate freeze-drying method to obtain a fine synthesized powder of 15% yttrium-doped barium zirconate. Fine 15% yttrium-doped barium zirconate powder of particle size about 30nm was obtained by synthesizing at 500°C in vacuum from a powder mixed by the nitrate freeze-drying method. However, we could not obtain such fine powder by synthesizing in air. Using the powder

  15. High performance ceramic interconnect material for solid oxide fuel cells (SOFCs): Ca and transition metal-doped yttrium chromite

    Microsoft Academic Search

    Kyung Joong Yoon; Jeffrey W. Stevenson; Olga A. Marina

    2011-01-01

    The effect of transition metal substitution on thermal and electrical properties of Ca-doped yttrium chromite was investigated in relation to use as a ceramic interconnect in high temperature solid oxide fuel cells (SOFCs). 10at.% Co, 4at.% Ni, and 1at.% Cu substitution on B-site of 20at.% Ca-doped yttrium chromite led to a close match of thermal expansion coefficient (TEC) with that

  16. Effect of yttrium oxide volume fraction and particle size on elevated temperature strength of a dispersic strengthened superalloy

    Microsoft Academic Search

    J. S. Benjamin; M. J. Bomford

    1974-01-01

    The effect of yttrium oxide dispersoid volume fraction and particle size on the 1400†F (1033 K) and 1900†F (1311 K) rupture\\u000a strength of a dispersion strengthened nickel-base superalloy, made by mechanical alloying, was investigated. Yttrium oxide\\u000a Contents ranged from 0 pct to 4.5 pct by volume, and average oxide particle sizes varied from about 150? (15 nm) to 580? (15

  17. The influence of implanted chromium and yttrium on the oxidation behaviour of TiAl-based intermetallics

    Microsoft Academic Search

    A. Gil; B. Rajchel; N. Zheng; W. J. Quadakkers; H. Nickel

    1995-01-01

    The influence of implanted chromium and yttrium on the oxidation behaviour of Ti-50Al (at %) in air at 800 °C was investigated. It was found that implanted chromium and\\/or yttrium leads to a decrease of the oxidation rate because an alumina scale was formed on the implanted material in the early stages of oxidation, whereas a titania-based scale grew on

  18. Effect of alloying yttrium on corrosion–erosion behavior of 27Cr cast white iron in different corrosive slurries

    Microsoft Academic Search

    Tiancheng Zhang; D. Y Li

    2002-01-01

    Chill cast white iron alloyed with yttrium from 0 to 1.5 wt.% was investigated with regard to its resistance to corrosion–erosion in different slurries, including tap water, NaOH (pH 12), and HNO3 (pH 3) solutions, respectively, mixed with 30 wt.% silicon sand. For comparison, sand cast 27Cr white iron was also evaluated. It was demonstrated that alloying yttrium considerably improved

  19. Synthesis of Nd 3+ doped nano-crystalline yttrium aluminum garnet (YAG) powders leading to transparent ceramic

    Microsoft Academic Search

    Xia Li; Qiang Li; Jiyang Wang; Shunliang Yang; Hong Liu

    2007-01-01

    Nd-doped yttrium aluminum garnet (Nd:YAG) nano-crystallites were prepared by the co-precipitation method from a mixed solution of yttrium and aluminum nitrate using ammonium hydrogen carbonate as precipitant. The phase transition and structure of the prepared powder were investigated by means of XRD and TEM. The powder showed significantly less agglomeration of crystallites, indicating a high degree of sinterability. Transparent YAG

  20. Beneficial effects of yttrium on the mechanical failure and chemical stability of the passive film of 304 stainless steel

    Microsoft Academic Search

    X. Y. Wang; D. Y. Li

    2001-01-01

    Recent studies demonstrated that yttrium improved the resistance of stainless steel to corrosive wear. However, the mechanism responsible for the beneficial effect of yttrium was not well understood. In this work, the breakdown of passive films of Y-free and Y-containing 304 stainless steel specimens during indentation and scratch testing was studied using a micro-mechanical probe. The failure of the passive

  1. SU-E-T-116: Dose Response in the Treatment of Unresectable Cholangiocarcinoma with Yttrium-90 Microspheres

    SciTech Connect

    Yu, S; Green, G; Sehgal, V; Samford, G; Kuo, J; Imagawa, D; Fernando, D; Al-Ghazi, M [University of California, Orange, CA (United States)

    2014-06-01

    Purpose: The purpose of this study is to assess the dose response of radioembolization using yttrium-90 (Y-90) microspheres in patients treated for unresectable cholangiocarcinoma. This study utilized partition dosimetry model for the dose calculation. The results show survival benefit with dose escalation. Methods: Between February 2009 and March 2013, ten patients with pathology proven unresectable cholangiocarcinoma were radioembolized with Y-90 microspheres. Patients underwent initial pre-treatment angiographic assessment for blood flow and 99mTc- MAA for lung shunt evaluation. Activity of Y-90 administration was calculated using the Body Surface Area (BSA) and target volumes which were determined by contouring the pre-treatment MRI/CT images using a radiation therapy treatment planning system. Medical Internal Radiation Dose (MIRD) method was used to assess the dosimetric results of Y90. Partition model based on the tumor to-liver activity uptake estimated from pretreatment 99mTc- MAA study was used to calculate the dose delivered to the target. The variables assessed included: administered dose, toxicity based on clinical changes, imaging based tumor response, and survival. Results: Ten patients were radioembolized with Y-90 microspheres to either one hepatic lobe or both left and right lobes. Patients were stratified by dose. Four patients who received dose greater than 140Gy (p < 0.05) all survived. The corresponding activity they received was greater than 35 mCi. Six out of ten patients died of disease with median survival of 18 weeks (range 12–81wks). Conclusion: Given the growing body of data for Y-90 microspheres in the context of cholangiocarcinoma, radioembolization may become an important treatment modality for an appropriately selected group of patients. Our study further substantiates past studies and shows additional evidence of a survival benefit with dose escalation.

  2. In Vivo Function of PTEX88 in Malaria Parasite Sequestration and Virulence.

    PubMed

    Matz, Joachim M; Ingmundson, Alyssa; Costa Nunes, Jean; Stenzel, Werner; Matuschewski, Kai; Kooij, Taco W A

    2015-06-01

    Malaria pathology is linked to remodeling of red blood cells by eukaryotic Plasmodium parasites. Central to host cell refurbishment is the trafficking of parasite-encoded virulence factors through the Plasmodium translocon of exported proteins (PTEX). Much of our understanding of its function is based on experimental work with cultured Plasmodium falciparum, yet direct consequences of PTEX impairment during an infection remain poorly defined. Using the murine malaria model parasite Plasmodium berghei, it is shown here that efficient sequestration to the pulmonary, adipose, and brain tissue vasculature is dependent on the PTEX components thioredoxin 2 (TRX2) and PTEX88. While TRX2-deficient parasites remain virulent, PTEX88-deficient parasites no longer sequester in the brain, correlating with abolishment of cerebral complications in infected mice. However, an apparent trade-off for virulence attenuation was spleen enlargement, which correlates with a strongly reduced schizont-to-ring-stage transition. Strikingly, general protein export is unaffected in PTEX88-deficient mutants that mature normally in vitro. Thus, PTEX88 is pivotal for tissue sequestration in vivo, parasite virulence, and preventing exacerbation of spleen pathology, but these functions do not correlate with general protein export to the host erythrocyte. The presented data suggest that the protein export machinery of Plasmodium parasites and their underlying mechanistic features are considerably more complex than previously anticipated and indicate challenges for targeted intervention strategies. PMID:25820521

  3. A Further Study of the Beneficial Effects of Yttrium on Oxide Scale Properties and High-Temperature Wear of Stellite 21

    Microsoft Academic Search

    Iulian Radu; D. Y. Li

    2008-01-01

    Alloying yttrium to Co-based alloys has been proven to considerably improve their oxide scales that play an important role\\u000a in resisting wear at elevated temperatures. In addition to the formation of Y2O3 phase in the oxide scale, the yttrium addition may also change the oxidation mechanism, which could be responsible for many\\u000a benefits of yttrium to the wear resistance of

  4. Recovery of niobium from irradiated targets

    DOEpatents

    Phillips, Dennis R. (Los Alamos, NM); Jamriska, Sr., David J. (Los Alamos, NM); Hamilton, Virginia T. (Los Alamos, NM)

    1994-01-01

    A process for selective separation of niobium from proton irradiated molybdenum targets is provided and includes dissolving the molybdenum target in a hydrogen peroxide solution to form a first ion-containing solution, contacting the first ion-containing solution with a cationic resin whereby ions selected form the group consisting of molybdenum, biobium, technetium, selenium, vanadium, arsenic, germanium, zirconium and rubidium remain in a second ion-containing solution while ions selected from the group consisting of rubidium, zinc, beryllium, cobalt, iron, manganese, chromium, strontium, yttrium and zirconium are selectively adsorbed by the cationic resin; adjusting the pH of the second ion-containing solution to within a range of from about 5.0 to about 6.0; contacting the pH adjusting second ion-containing solution with a dextran-based material for a time to selectively separate niobium from the solution and recovering the niobium from the dextran-based material.

  5. Interactions between aggressive ions and the surface of a magnesium-yttrium alloy.

    PubMed

    Johnson, Ian; Perchy, Daniel; Liu, Huinan

    2012-01-01

    Magnesium alloys possess many desirable properties for biodegradable orthopedic implants. Unfortunately, magnesium degrades too rapidly in vivo. This rapid degradation reduces the alloys' mechanical properties and increases the alkalinity of the local environment. Controlling the degradation rate and mode is an essential step in the development of magnesium based biomaterials. Accomplishing this essential step will require an improved understanding of magnesium alloy degradation. Herein, three interacting factors controlling magnesium degradation were investigated; (1) alloy composition, (2) alloy surface, (3) presence of aggressive ions in the immersion media. The magnesium-yttrium alloy was more susceptible to degradation in water than the high purity magnesium alloy. However, the polished surface magnesium-yttrium alloy had the least susceptibility to degradation in phosphate buffered saline (PBS) among all the sample compositions and surfaces. PMID:23367216

  6. Mechanism for radiation damage resistance in yttrium oxide dispersion strengthened steels

    NASA Astrophysics Data System (ADS)

    Brodrick, J.; Hepburn, D. J.; Ackland, G. J.

    2014-02-01

    ODS steels based on yttrium oxide have been suggested as potential fusion reactor wall materials due to their observed radiation resistance properties. Presumably this radiation resistance can be related to the interaction of the particle with vacancies, self-interstitial atoms (SIAs) and other radiation damage debris. Density functional theory has been used to investigate this at the atomic scale. Four distinct interfaces, some based on HRTEM observations, between iron and yttrium oxide were investigated. It is been shown that the Y2O3-Fe interface acts as a strong trap with long-range attraction for both interstitial and vacancy defects, allowing recombination without altering the interface structure. The catalytic elimination of defects without change to the microstructure explains the improved behaviour of ODS steels with respect to radiation creep and swelling.

  7. Preparation and characterization of isotopic oxygen-enriched yttrium barium copper oxide

    SciTech Connect

    Ott, K.C.; Smith, J.L.

    1988-01-01

    The preparation of labeled superconducting yttrium barium copper oxides from the labeled metal nitrates is described. The materials were characterized by a variety of physical techniques, and their superconducting properties were measured. Trends are seen in the structural parameters of the materials obtained by the nitrate route and also in isotopically enriched materials prepared via gas-phase exchange. These structural changes are accompanied by changes in superconducting properties. The /sup 18/O-enriched yttrium barium copper oxide prepared via the nitrate route has a T/sub c/depressed by 33/degree/K to 59/degree/K, whereas a /sup 17/O sample has a T/sub c/ between the /sup 18/O material and similarly prepared /sup 16/O sample. 15 refs., 1 fig., 3 tabs.

  8. 7 CFR 1230.88 - Patents, copyrights, inventions, and publications.

    Code of Federal Regulations, 2014 CFR

    2014-01-01

    ... 2014-01-01 false Patents, copyrights, inventions, and publications. ...Miscellaneous § 1230.88 Patents, copyrights, inventions, and publications. Any patents, copyrights, trademarks, inventions,...

  9. 7 CFR 1230.88 - Patents, copyrights, inventions, and publications.

    Code of Federal Regulations, 2012 CFR

    2012-01-01

    ... 2012-01-01 false Patents, copyrights, inventions, and publications. ...Miscellaneous § 1230.88 Patents, copyrights, inventions, and publications. Any patents, copyrights, trademarks, inventions,...

  10. 7 CFR 1230.88 - Patents, copyrights, inventions, and publications.

    Code of Federal Regulations, 2013 CFR

    2013-01-01

    ... 2013-01-01 false Patents, copyrights, inventions, and publications. ...Miscellaneous § 1230.88 Patents, copyrights, inventions, and publications. Any patents, copyrights, trademarks, inventions,...

  11. 14 CFR 34.83-34.88 - [Reserved

    Code of Federal Regulations, 2010 CFR

    2010-01-01

    ...TRANSPORTATION AIRCRAFT FUEL VENTING AND EXHAUST EMISSION REQUIREMENTS FOR TURBINE ENGINE POWERED AIRPLANES Test Procedures for Engine Smoke Emissions (Aircraft Gas Turbine Engines) §§ 34.83-34.88...

  12. 14 CFR 34.83-34.88 - [Reserved

    Code of Federal Regulations, 2012 CFR

    2012-01-01

    ...TRANSPORTATION AIRCRAFT FUEL VENTING AND EXHAUST EMISSION REQUIREMENTS FOR TURBINE ENGINE POWERED AIRPLANES Test Procedures for Engine Smoke Emissions (Aircraft Gas Turbine Engines) §§ 34.83-34.88...

  13. 10 CFR 51.88 - Proposals for legislation.

    Code of Federal Regulations, 2011 CFR

    2011-01-01

    ...FUNCTIONS National Environmental Policy Act-Regulations...2) Legislative Environmental Impact Statements-Proposals for Legislation § 51.88 Proposals...for proposals for legislation. final environmental impact...

  14. 10 CFR 51.88 - Proposals for legislation.

    Code of Federal Regulations, 2012 CFR

    2012-01-01

    ...FUNCTIONS National Environmental Policy Act-Regulations...2) Legislative Environmental Impact Statements-Proposals for Legislation § 51.88 Proposals...for proposals for legislation. final environmental impact...

  15. 10 CFR 51.88 - Proposals for legislation.

    Code of Federal Regulations, 2014 CFR

    2014-01-01

    ...FUNCTIONS National Environmental Policy Act-Regulations...2) Legislative Environmental Impact Statements-Proposals for Legislation § 51.88 Proposals...for proposals for legislation. final environmental impact...

  16. 10 CFR 51.88 - Proposals for legislation.

    Code of Federal Regulations, 2013 CFR

    2013-01-01

    ...FUNCTIONS National Environmental Policy Act-Regulations...2) Legislative Environmental Impact Statements-Proposals for Legislation § 51.88 Proposals...for proposals for legislation. final environmental impact...

  17. 10 CFR 51.88 - Proposals for legislation.

    Code of Federal Regulations, 2010 CFR

    2010-01-01

    ...FUNCTIONS National Environmental Policy Act-Regulations...2) Legislative Environmental Impact Statements-Proposals for Legislation § 51.88 Proposals...for proposals for legislation. final environmental impact...

  18. 7 CFR 1214.88 - OMB control numbers.

    Code of Federal Regulations, 2014 CFR

    2014-01-01

    ...AGREEMENTS AND ORDERS; MISCELLANEOUS COMMODITIES), DEPARTMENT OF AGRICULTURE CHRISTMAS TREE PROMOTION, RESEARCH, AND INFORMATION ORDER Christmas Tree Promotion, Research, and Information Order Miscellaneous § 1214.88 OMB...

  19. 7 CFR 1214.88 - OMB control numbers.

    Code of Federal Regulations, 2013 CFR

    2013-01-01

    ...AGREEMENTS AND ORDERS; MISCELLANEOUS COMMODITIES), DEPARTMENT OF AGRICULTURE CHRISTMAS TREE PROMOTION, RESEARCH, AND INFORMATION ORDER Christmas Tree Promotion, Research, and Information Order Miscellaneous § 1214.88 OMB...

  20. 7 CFR 1214.88 - OMB control numbers.

    Code of Federal Regulations, 2012 CFR

    2012-01-01

    ...AGREEMENTS AND ORDERS; MISCELLANEOUS COMMODITIES), DEPARTMENT OF AGRICULTURE CHRISTMAS TREE PROMOTION, RESEARCH, AND INFORMATION ORDER Christmas Tree Promotion, Research, and Information Order Miscellaneous § 1214.88 OMB...

  1. Utility of Arylamido Ligands in Yttrium and Lanthanide Chemistry(1).

    PubMed

    Evans, William J.; Ansari, Mohammad A.; Ziller, Joseph W.; Khan, Saeed I.

    1996-09-11

    The reactivity of KNHAr reagents (Ar = C(6)H(5), C(6)H(3)Me(2)-2,6, C(6)H(3)(i)Pr(2)-2,6) with lanthanide and yttrium trichlorides has been investigated. With the larger metals Nd and Sm and the smaller 2,6-dimethyl-substituted ligand, the bimetallic dianionic complexes [K(THF)(6)](2)[Ln(&mgr;-NHC(6)H(3)Me(2)-2,6)(NHC(6)H(3)Me(2)-2,6)(3)](2) (Ln: Sm, 1a; Nd, 1b) are isolated as the potassium salts. Under the same reaction conditions YCl(3) forms a bimetallic anion which retains chloride: [K(DME)(2)(THF)(3)][Y(2)(&mgr;-NHC(6)H(3)Me(2)-2,6)(2)(&mgr;-Cl)(NHC(6)H(3)Me(2)-2,6)(4)(THF)(2)], 2. With the larger 2,6-diisopropyl ligands, neutral complexes are isolated in both solvated monometallic and unsolvated bimetallic forms. With Nd, a distorted octahedral trisolvate, Nd(NHC(6)H(3)(i)Pr(2)-2,6)(3)(THF)(3), 3, was obtained, whereas with Yb and Y the trigonal bipyramidal disolvates, Ln(NHC(6)H(3)(i)Pr(2)-2,6)(3)(THF)(2) (Ln: Yb, 4a; Y, 4b), were isolated. THF-free complexes of the NHC(6)H(3)(i)Pr(2)-2,6 ligand are available by reacting the amine NH(2)C(6)H(3)(i)Pr(2)-2,6 with Ln[N(SiMe(3))(2)](3) complexes. By this route, the dimers [Ln(&mgr;-NHC(6)H(3)(i)Pr(2)-2,6)(NHC(6)H(3)(i)Pr(2)-2,6)(2)](2) (Ln: Yb, 5a; Y, 5b) were isolated. The reaction of the unsubstituted arylamido salt KNHC(6)H(5) with NdCl(3) produced an insoluble material which was characterized as [Nd(NHC(6)H(5))(3)(KCl)(3)], 6. 6 reacted with Al(2)Me(6) in hexanes and produced a heteroleptic mixed-metal complex {[Me(2)Al(&mgr;-Me(2))](2)Nd(&mgr;(3)-NC(6)H(5))(&mgr;-Me)AlMe}(2), 7, and the trimeric aluminum arylamido complex [Me(2)Al(&mgr;-NHC(6)H(5))](3), 8. The solvent of crystallization and relevant crystallographic data for the compounds identified by X-ray analysis follow: 1a,THF, 156 K, P2(1)/n, a = 12.985(2) Å, b = 27.122(5) Å, c = 17.935(3) Å, beta = 100.19(1) degrees, V = 6216(1) Å(3), Z = 2, 6148 reflections (I > 3sigma(I)), R(F)() = 7.1%; 1b,THF, 156 K, P2(1)/n, a = 12.998(2) Å, b = 27.058(3) Å, c = 17.962(2) Å, beta = 99.74(1) degrees, V = 6225(1) Å(3), Z = 2; 2,DME/hexanes, P2(1)/n, a = 23.335(2) Å, b = 12.649(1) Å, c = 27.175(3) Å, beta = 96.36(1) degrees, V = 7971(1) Å(3), Z = 4, 2788 reflections (I > 3sigma(I)), R(F)() = 9.5%; 3, THF, P2(1), a = 12.898(1) Å, b = 16.945(1) Å, c = 13.290(1) Å, beta = 118.64(2) degrees, V = 2549.3(3) Å(3), Z = 2, 3414 reflections (I > 3sigma(I)), R(F)() = 4.3%; 4a, hexanes, P2(1), a = 9.718(2) Å, b = 19.119(3) Å, c = 12.640(2) Å, beta = 112.08(1) degrees, V = 2176.3(6) Å(3), Z = 2, 2933 reflections (I > 3sigma(I)), R(F)() = 4.3%; 4b, hexanes, 158 K, a = 9.729(2) Å, b = 19.095(5) Å, c = 12.744(1) Å, beta = 112.11(1) degrees, V = 2193.4(6) Å(3); 5b, hot toluene, 158 K, P2(1), a =19.218(9) Å, b = 9.375(3) Å, c = 19.820(5) Å, beta = 110.25(2) degrees, V = 3350(2)Å(3), Z = 2, 1718 reflections (I > 2sigma (I)), R1 = 9.7%; 7, hexanes, 156 K, P&onemacr;, a = 9.618(3) Å, b = 12.738(4) Å, c = 9.608(3) Å, alpha = 99.32(1) degrees, beta = 108.87(1) degrees, gamma = 94.23(1) degrees, V = 1089.1(6) Å(3), Z = 2, 2976 reflections (I > 3sigma(I)), R(F)() = 3.9%; 8, hexanes, 156 K, Pcab, a = 23.510(5) Å, b = 25.462(5) Å, c = 8.668(2) Å, V = 5188(1) Å(3), Z = 8, 1386 reflections (I > 3sigma(I)), R(F)() = 5.7%. PMID:11666728

  2. Spectrofluorimetric determination of nucleic acids as 8-hydroxyquinoline\\/ yttrium ternary complexes

    Microsoft Academic Search

    Cheng Zhi Huang; Ke An Li; Shen Yang Tong

    1997-01-01

    The formation of nucleic acids\\/8-hydroxyquinoline\\/yttrium(III) ternary complexes and their fluorescent properties have been studied. The nucleic acids studied include native and thermally denatured calf thymus DNA, fish sperm DNA and yeast RNA. In the range of pH 7.6–8.5, controlled by NH3-NH4C1 buffer, ternary complexes are formed that fluoresce at different wavelengths with different nucleic acids. Based on the fluorescence reactions,

  3. Stress development in thin yttrium films on hard substrates during hydrogen loading

    Microsoft Academic Search

    M. Dornheim; A. Pundt; R. Kirchheim; S. J. V. D. Molen; E. S. Kooij; J. Kerssemakers; R. Griessen; H. Harms; U. Geyer

    2003-01-01

    Polycrystalline (0002)-textured yttrium (Y) films of 50-500 nm thickness on sapphire substrates were loaded electrolytically with hydrogen (H). The stresses which build up in these films were measured in situ using curvature measurements. The results are compared to the behavior of bulk Y-H. A linear elastic model is used to predict the behavior of clamped thin films. Basic properties of

  4. Chemicospectral determination of yttrium, lanthanum, and cerium by three-phase iodide extraction system

    Microsoft Academic Search

    I. S. Kalmykova; V. F. Mezentseva; E. V. Ponosova

    1974-01-01

    The extraction of rare-earth elements into chloroform with DAM in the usual two-phase system was investigated earlier [3]. Subsequent investigations showed that yttrium, lanthanum, and cerium are capable of being extracted by a mixture of chloroform and benzene, and a third phase, with a volume not greater than 1.5 ml, is formed in this case as with other elements. To

  5. Calcium and Cobalt-doped Yttrium Chromites as an Interconnect Material for Solid Oxide Fuel Cells

    Microsoft Academic Search

    Kyung Joong Yoon; Carolyn N. Cramer; Edwin C. Thomsen; Christopher A. Coyle; Gregory W. Coffey; Olga A. Marina

    2010-01-01

    The structural, thermal and electrical characteristics of calcium- and cobalt-doped yttrium chromites were studied for a potential use as the interconnect material in high temperature solid oxide fuel cells (SOFCs) as well as other high temperature electrochemical and thermoelectric devices. The Y0.8Ca0.2Cr1-xCoxO3± (x=0, 0.1, 0.2, 0.3) compositions had single phase orthorhombic perovskite structures in the wide range of oxygen pressures.

  6. Low Temperature Resistivity of Yttrium-Based Alloys Containing Small Amounts of Rare Earth Metals

    Microsoft Academic Search

    Tadashi Sugawara

    1965-01-01

    The resistivity of the dilute alloys of rare earth metals with yttrium has been measured at low temperatures. The result is in qualitative agreement with the recent theories due to Kondo and others on the s--d or s--f scattering. The effective s--f exchange integrals for various rare-earth solutes have been derived from the analysis of the resistivity data and compared

  7. Thickness and temperature dependence of subsidiary absorption thresholds in yttrium-iron-garnet thin films

    Microsoft Academic Search

    A. V. Pomyalov; I. Laulicht; J. Barak

    1993-01-01

    The microwave subsidiary absorption threshold in tangentially magnetized yttrium-iron-garnet (YIG) films was measured as a function of the static magnetic field, film thickness and decrease in the 0.3-3 mum range is observed. The effect is explained quantitatively by using modified Damon-Eshbach dispersion relations which take into account exchange interactions. The effect of temperature on hcrit, the smallest threshold field amplitude,

  8. Extraction of rare earths and yttrium with high molecular weight carboxylic acids

    Microsoft Academic Search

    D. K. Singh; H. Singh; J. N. Mathur

    2006-01-01

    The extraction behaviour of trivalent rare earths namely La, Ce, Pr, Nd, Sm, Gd, Dy and Ho including Y (M(III), where M represents rare earths and yttrium ) from chloride medium has been studied with the solutions of high molecular weight carboxylic acids such as cekanoic, naphthenic, neo-heptanoic and Versatic 10 in dodecane. The effects of equilibrium pH, extractant concentration,

  9. Blue up-conversion emission in Yb and Tm-codoped potassium yttrium tungstate

    Microsoft Academic Search

    A. N. Kuzmin; A. V. Kachynski; P. N. Prasad; A. A. Demidovich; L. E. Batay; A. Bednarkiewicz; W. Strek; A. N. Titov

    2004-01-01

    The spectroscopic characteristics of potassium yttrium tungstate crystal (KYW), codoped with ytterbium and thulium ions, have been investigated from the point of view of up-conversion blue lasing from 1G4 multiplet. An overall 3H6 multiplet splitting of ~530 cm-1 for the trivalent thulium ion in the KYW host was obtained. A decay time of ~112 mus for the 1G4-->3H6 blue luminescence

  10. Enhanced UV and suppressed defect related emission in yttrium doped zinc oxide

    NASA Astrophysics Data System (ADS)

    Sharma, Vikas; Kumar, Parmod; Rana, Geeta; Vyas, Rishi; Sachdev, K.; Malik, Hitendra K.; Asokan, K.

    2014-04-01

    Yttrium doped ZnO (YZO) synthesized through conventional solid state reaction method using ZnO and Y2O3 as starting material. The formation of YZO compounds were confirmed by X-ray diffraction and Raman spectroscopy. Photoluminescence measurements revealed an enhanced ultra-violet (UV) and suppressed defect related emission in YZO which is due to reduction in the concentration of the defects related to oxygen interstitials (Oi) and zinc vacancy (VZn) of ZnO.

  11. Yttrium oxide:Eu 3+ red phosphor by self-propagating high temperature synthesis

    Microsoft Academic Search

    M. Kottaisamy; D. Jeyakumar; R. Jagannathan; M. Mohan Rao

    1996-01-01

    Yttrium oxide doped with trivalent europium has been prepared by self-propagating high temperature (SPHT) synthesis, also known as combustion synthesis, with nitrogen-based fuels. The materials synthesized have been characterized by X-ray diffraction, scanning electron microscopy, and luminescent emission spectroscopy. Crystallite size, powder density, and photoluminescent-emission intensity\\/efficiency are found to depend on the fuels used. The phosphor products were sintered with

  12. Effect of nonstoichiometry on fracture toughness and hardness of yttrium oxide ceramics

    Microsoft Academic Search

    Gilbert Fantozzi; Gilles Orange; Kaiming Liang; Martine Gautier; Jean-Paul Duraud; Philippe Maire; C. LeGressus; E. Gillett

    1989-01-01

    This work deals with the changes in mechanical properties of yttrium oxide ceramics induced by nonstoichiometry. The maximum fracture toughness Î\\/sub ic\\/, is observed at the stoichiometric composition. For an oxygen-deficient ceramic, a decrease of Î\\/sub ic\\/ is observed from 3.5 to 2.3 MPa.m¹². On the other hand, the Vickers hardness seems to be less dependent on stoichiometry. These results

  13. Selective self-propagating combustion synthesis of hexagonal and orthorhombic nanocrystalline yttrium iron oxide

    Microsoft Academic Search

    Ling Wu; Jimmy C. Yu; Lizhi Zhang; Xinchen Wang; Siukong Li

    2004-01-01

    Macroporous nanocrystalline YFeO3 was prepared by a self-propagating combustion method using yttrium nitrate and iron nitrate as precursors and glycine as a fuel. The phase structure of the product can be selectively controlled to be hexagonal or orthorhombic by simply adjusting the ratio of glycine to nitrate. The samples were characterized by X-ray diffraction (XRD) analysis, N2 adsorption, micro-Raman spectroscopy,

  14. Structure and luminescence spectra of lutetium and yttrium borates synthesized from ammonium nitrate melt

    Microsoft Academic Search

    Nikolay V. Klassen; Semion Z. Shmurak; Ivan M. Shmyt’ko; Galina K. Strukova; Stephen E. Derenzo; Marvin J. Weber

    2005-01-01

    Lutetium and yttrium borates doped with europium, terbium, gadolinium, etc. have been synthesized by dissolving initial oxides and nitrates in ammonium nitrate melt and thermal decomposition of the solvent. Annealings in the range of 500–1100°C modified the dimensions of the grains from 2 to 3nm to more than 100nm. Significant dependence of the structure of lutetium borate on slight doping

  15. Engineering of the band gap and optical properties of thin films of yttrium hydride

    NASA Astrophysics Data System (ADS)

    You, Chang Chuan; Mongstad, Trygve; Maehlen, Jan Petter; Karazhanov, Smagul

    2014-07-01

    Thin films of oxygen-containing yttrium hydride show photochromic effect at room temperature. In this work, we have studied structural and optical properties of the films deposited at different deposition pressures, discovering the possibility of engineering the optical band gap by variation of the oxygen content. In sum, the transparency of the films and the wavelength range of photons triggering the photochromic effect can be controlled by variation of the deposition pressure.

  16. Rare earth or yttrium, transition metal oxide thermistors. [for temperature compensation of oxygen meters

    SciTech Connect

    Laud, K.R.; Logothetis, E.M.; Park, J.K.

    1980-11-04

    Thermistors comprising transition metal such as iron, rare earth of the lanthanide series or yttrium, and oxygen exhibit sufficient independence to variation in oxygen partial pressure over a range of exhaust gas conditions of internal combustion engines as to make them particularly suitable for temperature compensation of oxygen sensors such as those derived from titania as well as temperature sensing in other oxygen varying environments.

  17. LAG EFFECT CAUSED BY MAGNETIC FIELD ACTING ON YTTRIUM AND FERRUM OXYHYDRATE GELS

    Microsoft Academic Search

    Y. I. Sukharev; T. G. Krupnova; I. Y. Apalikova; E. P Yudina

    1. Experimental Yttrium oxyhydrate gel (YOG) was synthesized using the method (2) where ?? =9,75, n=0,09 mole, t of synthesis is equal to 20°C, with the time of pattern aging equal to 1 year. Ferrum oxyhydrate gel (FOG) was synthesized using the method (1) where Cr\\/Fe = 0,15; nitriletrimethylphos- phonic acid\\/Fe = 0,1; t of synthesis is equal to 20°C,

  18. Fluxoid pinning in niobium containing small amounts of yttrium or gadolinium

    Microsoft Academic Search

    C. C. Koch; D. M. Kroeger

    1974-01-01

    The fluxoid pinning of niobium containing small amounts of either yttrium or gadolinium (2 at. %) was determined by direct current magnetization measurements on specimens in the heavily-deformed, partially-recovered, and recrystallized conditions. Optical and electron microscopy were used to characterize the samples.Magnetic hysteresis of Nb was increased by the additions of Y or Gd. In the cold-worked condition increased pinning

  19. Different Sintering Routes for Preparing Alumina-Yttrium Aluminum Garnet Nanocomposites

    Microsoft Academic Search

    P. Palmero; C. Stella; A. Simone; C. Esnouf; G. Fantozzi; L. Montanaro

    2005-01-01

    Alumina-yttrium aluminum garnet (YAG) 50 vol % nanocomposite powders were prepared by a wet-chemical synthesis and characterized by simultaneous DTA-TG, XRD, and TEM analyses. Amorphous powders were preheated at four different temperatures (namely, 600, 800, 900, and 1215°C) on the basis of the previous characterization, and the influence of this thermal treatment on sintering behavior, final microstructure, and density was

  20. Diffusion coefficient of yttrium ion in YCrO{sub 3}

    SciTech Connect

    Kawamura, Kenichi; Saiki, Atushi; Maruyama, Toshio; Nagata, Kazuhiro [Tokyo Inst. of Tech., Tokyo (Japan)

    1995-09-01

    The solid-state reaction; 1/2 Y{sub 2}O{sub 3} + 1/2 Cr{sub 2}O{sub 3} = YCrO{sub 3} was conducted between 1,458 and 1,719 K in air (P{sub O{sub 2}} = 0.21 atm). The reaction obeyed the parabolic rate law and the diffusion of yttrium ion controlled the reaction. According to Wagner`s theory, the diffusion coefficient of yttrium ion Y{sup 3+} in YCrO{sub 3} was evaluated using the Gibbs free energy change of the reaction and the parabolic rate constant. The defect reaction, Cr{sub 2}O{sub 3} + 3/2 O{sub 2} in the presence of YCrO{sub 3} yields 2 V{prime}{double_prime}{sub Y} + 2Cr{sub Cr}{sup x} + 6O{sub O}{sup X} + 6h{sup {sm_bullet}}, is predominant in the formation of yttrium vacancy. The diffusion coefficient of yttrium ion is given D{sub Y{sup 3+}}/m{sup 2} s{sup {minus}1} = [8.36 {times} 10{sup {minus}9} exp ({minus} 272/kJ/mol/RT)] P{sub O{sub 2}}{sup 3/16}a{sub Cr{sub 2}O{sub 3}}{sup 1/8} where a{sub Cr{sub 2}O{sub 3}} is activity of Cr{sub 2}O{sub 3} and P{sub O{sub 2}} is oxygen pressure.

  1. Modification of c-axis sapphire implanted with high dose yttrium ions

    Microsoft Academic Search

    Dong-Zhu Xie; De-Zhang Zhu; De-Xin Cao; Jian-Qing Cao; Hao-Chang Pan; Hong-Jie Xu

    1999-01-01

    Single crystalline samples of ?0001??-Al2O3 were implanted with 171 keV yttrium ions to high doses of 1×1017 and 9×1017 ions\\/cm2 at room temperature (RT) and then isothermally annealed at temperatures ranging from 500°C to 1050°C in air. The lattice damage in sapphire induced by ion irradiation and the thermal annealing behavior were analyzed using Rutherford Backscattering Spectrometry and Channeling (RBS-C)

  2. Research on cathode material of Li-ion battery by yttrium doping

    Microsoft Academic Search

    Yanwen TIAN; Xiaoxue KANG; Liying LIU; Chaqing XU; Tao QU

    2008-01-01

    Modification of LiFePO4, LiMn2O4 and Li1+xV3O8 by doping yttrium was investigated. The influences of doping Y on structure, morphology and electrochemical performance of cathode materials were investigated systematically. The results indicated that the mechanisms of Y doping in three cathode materials were different, so the influences on the material performance were different. The crystal structure of the three materials was

  3. Ionic transport and battery characterization studies of barium-doped potassium yttrium fluoride

    Microsoft Academic Search

    M. Narasimha Chary

    1996-01-01

    Pure and barium fluoride doped potassium yttrium fluoride materials were synthesized using the solid state reaction method and were characterized by X-ray diffraction, transference number and transient ionic current measurements. In all the samples the conductivity was found to be mainly ionic while the electronic conductivity was found to be small. Solid state batteries were fabricated in the configuration K\\/electrolyte\\/(I2

  4. Efficient holmium:yttrium lithium fluoride laser longitudinally pumped by a semiconductor laser array

    NASA Technical Reports Server (NTRS)

    Hemmati, H.

    1987-01-01

    Optical pumping of a holmium:yttrium lithium floride (Ho:YLF) crystal with a 790-nm continuous-wave diode-laser array has generated 56 mW of 2.1-micron laser radiation with an optical-to-optical conversion slope efficiency of 33 percent while the crystal temperature is held at 77 K. The lasing threshold occurs at 7 mW of input power, and laser operation continues up to a crystal temperature of 124 K.

  5. Off-line studies of the laser ionization of yttrium at the IGISOL facility

    NASA Astrophysics Data System (ADS)

    Kessler, T.; Moore, I. D.; Kudryavtsev, Y.; Peräjärvi, K.; Popov, A.; Ronkanen, P.; Sonoda, T.; Tordoff, B.; Wendt, K. D. A.; Äystö, J.

    2008-02-01

    A laser ion source is under development at the IGISOL facility, Jyväskylä, in order to address deficiencies in the ion guide technique. The key elements of interest are those of a refractory nature, whose isotopes and isomers are widely studied using both laser spectroscopic and high precision mass measurement techniques. Yttrium has been the first element of choice for the new laser ion source. In this work, we present a new coupled dye-Ti:Sapphire laser scheme and give a detailed discussion of the results obtained from laser ionization of yttrium atoms produced in an ion guide via resistive heating of a filament. The importance of not only gas purity, but indeed the baseline vacuum pressure in the environment outside the ion guide is discussed in light of the fast gas phase chemistry seen in the yttrium system. A single laser shot model is introduced and is compared to the experimental data in order to extract the level of impurities within the gas cell.

  6. Cold laser machining of nickel-yttrium stabilised zirconia cermets: Composition dependence

    SciTech Connect

    Sola, D. [Instituto de Ciencia de Materiales de Aragon, CSIC- Universidad de Zaragoza, C/ Pedro Cerbuna 12, E-50009, Zaragoza (Spain); Gurauskis, J., E-mail: jonas.gurauskis@unizar.es [Instituto de Ciencia de Materiales de Aragon, CSIC- Universidad de Zaragoza, C/ Pedro Cerbuna 12, E-50009, Zaragoza (Spain); Pena, J.I.; Orera, V.M. [Instituto de Ciencia de Materiales de Aragon, CSIC- Universidad de Zaragoza, C/ Pedro Cerbuna 12, E-50009, Zaragoza (Spain)

    2009-09-15

    Cold laser micromachining efficiency in nickel-yttrium stabilised zirconia cermets was studied as a function of cermet composition. Nickel oxide-yttrium stabilised zirconia ceramic plates obtained via tape casting technique were machined using 8-25 ns pulses of a Nd: YAG laser at the fixed wavelength of 1.064 {mu}m and a frequency of 1 kHz. The morphology of the holes, etched volume, drill diameter, shape and depth were evaluated as a function of the processing parameters such as pulse irradiance and of the initial composition. The laser drilling mechanism was evaluated in terms of laser-material interaction parameters such as beam absorptivity, material spallation and the impact on the overall process discussed. By varying the nickel oxide content of the composite the optical absorption (-value is greatly modified and significantly affected the drilling efficiency of the green state ceramic substrates and the morphology of the holes. Higher depth values and improved drilled volume upto 0.2 mm{sup 3} per pulse were obtained for substrates with higher optical transparency (lower optical absorption value). In addition, a laser beam self-focussing effect is observed for the compositions with less nickel oxide content. Holes with average diameter from 60 {mu}m to 110 {mu}m and upto 1 mm in depth were drilled with a high rate of 40 ms per hole while the final microstructure of the cermet obtained by reduction of the nickel oxide-yttrium stabilised zirconia composites remained unchanged.

  7. Novel syntergistic agent for selective separation of yttrium from other rare earth metals

    SciTech Connect

    Miyata, Terufumi; Goto, Masahiro; Nakashio, Fumiyuki [Kyushu Univ., Fukuoka (Japan)

    1995-06-01

    An oil-soluble synergistic agent has been developed for the selective separation of yttrium (Y) from the other rare earth metals. The synergistic agent is a polyaminocarboxylic acid alkylderivative and has interfacial activity like that of surfactants. Separation of yttrium from heavy rare earth metals (erbium (Er) and holmium (Ho)) in the presence of the synergistic agent was carried out with a 2-ethylhexyl phosphonic acid mono-2-ethylhexyl ester as a carrier using a hollow-fiber membrane extractor. The new agent shows a synergistic effect on the permeation rate of rare earth metals at the oil-water interface. By the addition of a small amount of the agent, the selectivity for yttrium from the two rare earth metals was enhanced remarkably, because of the permeation rate of Y was selectively decreased compared with those of Er and Ho. The synergistic effect is discussed from the viewpoint of the stability constant for rare earth metals and the interfacial activity of the synergistic agent. The difference in interaction between the synergistic agent and rare earth ions at the oil-water interface results in an increase in the separation efficiency.

  8. Effect of yttrium additions on void swelling in Liquid Metal Fast Breeder Reactor candidate cladding alloys

    SciTech Connect

    Hopson, R.D.

    1981-10-01

    Candidate Liquid Metal Fast Breeder Reactor cladding alloys AL1 (Fe-26% Ni-9% Cr) and AL2 (Fe-35% Ni-12% Cr) without and with the addition of 0.1% yttrium were bombarded by 4 MeV/sup 56/Fe/sup 2 +/ ions without and with simultaneous bombardment by 0.4 MeV /sup 4/He/sup +/ ions. These bombardments were conducted at various irradiation temperatures to determine the effect of yttrium on void swelling. The addition of yttrium decreased peak swelling for 4 MeV /sup 56/Fe/sup 2 +/ ion bombarded AL1 and AL2 by 28% and 20%, respectively. In all cases where similar sample comparisons were made (i.e., undoped with undoped and doped with doped) and where bombardment conditions were similar (i.e., single with single beam and dual with dual beam), AL1 showed less peak swelling than did AL2. Simultaneously implanting helium during heavy-ion bombardment increased peak swelling in undoped and doped AL1 by factors of 2.3 and 2.6, respectively.

  9. Time of formation and genesis of yttrium-zirconium mineralization in the Sakharjok massif, Kola Peninsula

    NASA Astrophysics Data System (ADS)

    Vetrin, V. R.; Skublov, S. G.; Balashov, Yu. A.; Lyalina, L. M.; Rodionov, N. V.

    2014-12-01

    The Kola geotectonic province in the northeastern Fennoscandian Shield accommodates a significant number of alkaline rock massifs differing in age. They are of mantle and mantle-crustal origin (alkali and nepheline syenites, carbonatites) and related to crustal sources (Neoarchean alkali granites). Among them, the Neoarchean Sakharjok nepheline syenite massif is related to the oldest intrusions of this kind bearing yttrium-zirconium mineralization. The crystallization of alkali syenite pertaining to the first intrusive phase of the intrusive Sakharjok massif is dated to 2645 ± 7 Ma, and this implies that this syenite postdated alkali granites (2.66-2.67 Ga). To date the yttrium-zirconium ore, we applied the local U-Pb method to zircon crystals occurring in the mineralized block hosted in nepheline syenite. The earliest fragments of zircon crystallized 1832 ± 7 Ma ago; the age of metamorphism is estimated at 1784 ± 13 Ma. These dates indicate the Paleoproterozoic age of the yttrium-zirconium mineralization, which was formed as a product of fluid reworking of the Neoarchean nepheline syenite of the Sakharjok massif.

  10. The influence of implanted yttrium on the cyclic oxidation behaviour of 304 stainless steel

    NASA Astrophysics Data System (ADS)

    Riffard, F.; Buscail, H.; Caudron, E.; Cueff, R.; Issartel, C.; Perrier, S.

    2006-03-01

    High-temperature alloys are frequently used in power plants, gasification systems, petrochemical industry, combustion processes and in aerospace applications. Depending on the application, materials are subjected to corrosive atmospheres and thermal cycling. In the present work, thermal cycling was carried out in order to study the influence of implanted yttrium on the oxide scale adherence on 304 steel specimens oxidised in air at 1273 K. In situ X-ray diffraction indicates that the oxides formed at 1273 K are different on blank specimens compared to implanted specimens. Glancing angle XRD allows to analyse the oxide scale composition after cooling to room temperature. Experimental results show that yttrium implantation at a nominal dose of 10 17 ions cm -2 does not improve significantly the cyclic oxidation behaviour of the austenitic AISI 304 steel. However, it appears that yttrium implantation remarkably enhance the oxidation resistance during isothermal oxidation. It reduces the transient oxidation stage and the parabolic oxidation rate constant by one order of magnitude.

  11. A study on factors affecting the degradation of magnesium and a magnesium-yttrium alloy for biomedical applications.

    PubMed

    Johnson, Ian; Liu, Huinan

    2013-01-01

    Controlling degradation of magnesium or its alloys in physiological saline solutions is essential for their potential applications in clinically viable implants. Rapid degradation of magnesium-based materials reduces the mechanical properties of implants prematurely and severely increases alkalinity of the local environment. Therefore, the objective of this study is to investigate the effects of three interactive factors on magnesium degradation, specifically, the addition of yttrium to form a magnesium-yttrium alloy versus pure magnesium, the metallic versus oxide surfaces, and the presence versus absence of physiological salt ions in the immersion solution. In the immersion solution of phosphate buffered saline (PBS), the magnesium-yttrium alloy with metallic surface degraded the slowest, followed by pure magnesium with metallic or oxide surfaces, and the magnesium-yttrium alloy with oxide surface degraded the fastest. However, in deionized (DI) water, the degradation rate showed a different trend. Specifically, pure magnesium with metallic or oxide surfaces degraded the slowest, followed by the magnesium-yttrium alloy with oxide surface, and the magnesium-yttrium alloy with metallic surface degraded the fastest. Interestingly, only magnesium-yttrium alloy with metallic surface degraded slower in PBS than in DI water, while all the other samples degraded faster in PBS than in DI water. Clearly, the results showed that the alloy composition, presence or absence of surface oxide layer, and presence or absence of physiological salt ions in the immersion solution all influenced the degradation rate and mode. Moreover, these three factors showed statistically significant interactions. This study revealed the complex interrelationships among these factors and their respective contributions to degradation for the first time. The results of this study not only improved our understanding of magnesium degradation in physiological environment, but also presented the key factors to consider in order to satisfy the degradation requirements for next-generation biodegradable implants and devices. PMID:23799028

  12. ISI ReprintSeries ISIIRS-88-210

    E-print Network

    Robins, Gabriel

    ISI ReprintSeries ISIIRS-88-210 June1988 University ofSouthern California Gabriel Robins Applications of the ISI Grapher Reprinted from Proceedingsof the ArtificialIntelligenceand Advanced Computer PERFORMING ORGANIZATION REPORT NUMBER(S) 5. MONITORING ORGANIZATION REPORT NUMBER(S) ISI/RS-88

  13. ISI TechnicalManual ISI/TM-88-197

    E-print Network

    Robins, Gabriel

    ISI TechnicalManual ISI/TM-88-197 February1988 University ofSouthern California Gabriel Robins %% ... ... .. The ISI Grapher Manual INFORMATION SCIENCES 213/822-1511 INSTITUTEJ f-"-676 292-t5466Admiralty Way. MONITORING ORGANIZATION REPORT NUMBER(S) ISI/TM-88-197 6a. NAME OF PERFORMING ORGANIZATION USC

  14. MYD88 L265P mutation in Waldenstrom macroglobulinemia.

    PubMed

    Poulain, Stéphanie; Roumier, Christophe; Decambron, Audrey; Renneville, Aline; Herbaux, Charles; Bertrand, Elisabeth; Tricot, Sabine; Daudignon, Agnès; Galiègue-Zouitina, Sylvie; Soenen, Valerie; Theisen, Olivier; Grardel, Nathalie; Nibourel, Olivier; Roche-Lestienne, Catherine; Quesnel, Bruno; Duthilleul, Patrick; Preudhomme, Claude; Leleu, Xavier

    2013-05-30

    Mutation of the MYD88 gene has recently been identified in activated B-cell-like diffuse cell lymphoma and enhanced Janus kinase/signal transducer and activator of transcription (JAK-STAT) and nuclear factor ?B (NF-?B) signaling pathways. A whole exome-sequencing study of Waldenstrom macroglobulinemia (WM) suggested a high frequency of MYD88 L265P mutation in WM. The genetic background is not fully deciphered in WM, although the role of NF-?B and JAK-STAT has been demonstrated. We analyzed MYD88 mutation in exon 5 and characterized the clinical significance of this genetic alteration in 67 WM patients. Clinical features; immunophenotypic markers; and conventional cytogenetic, fluorescence in situ hybridization, and single nucleotide polymorphism array data were analyzed. MYD88 L265P mutation was acquired in 79% of patients. Overall, we have identified alteration of the MYD88 locus in 91% of WM patients, including 12% with gain on chromosome 3 at the 3p22 locus that included the MYD88 gene. Patients with absence of MYD88 mutation were WM characterized with a female predominance, a splenomegaly, gain of chromosome 3, and CD27 expression. Importantly, inhibition of MYD88 signaling induced cytotoxicity and inhibited cell growth of cell lines issued from patients with WM. In conclusion, these results confirm a high frequency of MYD88 L265P mutation in WM. The discovery of MYD88 L265P mutation may contribute to a better understanding of the physiopathogeny of WM. PMID:23532735

  15. Inhibition of myeloid differentiation factor 88 signaling mediated by histidine-grafted poly(?-amino ester) ester nanovector induces donor-specific liver allograft tolerance

    PubMed Central

    Hu, Fanguo; Wang, Hanjie; Zhang, Shuangnan; Peng, Yao; Su, Lin; Chang, Jin; Liu, Gang

    2015-01-01

    Toll-like receptors (TLRs) activate biochemical pathways that evoke activation of innate immunity, which leads to dendritic cell maturation and initiation of adaptive immune responses that provoke allograft rejection. We aimed to prolong allograft survival by selectively inhibiting expression of myeloid differentiation factor 88 (MyD88), which is an essential adaptor in TLR signaling. We designed and synthesized a novel histidine-grafted poly(?-amino ester) (HGPAE) nanovector, which was shown to be safe and efficient both in vitro and in vivo for the delivery of a plasmid containing shRNA targeting MyD88 (pMyD88). We also demonstrated that the pMyD88/HGPAE complex mediated remarkable inhibition of MyD88 expression in rat liver in vivo. We transplanted Dark Agouti rat livers lacking MyD88 as result of transfection with the pMyD88/HGPAE complex into Lewis rats. The recipients survived longer and graft rejection of the donor liver as well as serum levels of IL-2 and IFN-? in the recipient were significantly reduced. PMID:26185440

  16. [Data in metric tons of yttrium oxide (Y2O3) content unless otherwise noted] Domestic Production and Use: Rare earths were mined by one U.S. company in 2012. Bastnasite, a rare-earth

    E-print Network

    and concentrates (monazite) 2612.20.0000 Free. Rare-earth metals, scandium and yttrium, whether or not intermixed Production and Use: Rare earths were mined by one U.S. company in 2012. Bastnasite, a rare-earth% Y2O3 2846.90.4000 Free. Other rare-earth compounds, including yttrium oxide >85% Y2O3, yttrium

  17. Unidirectional anisotropy in the spin pumping voltage in yttrium iron garnet/platinum bilayers

    SciTech Connect

    Vilela-Leao, L. H.; Salvador, C.; Azevedo, A.; Rezende, S. M.

    2011-09-05

    Detailed measurements of the dc voltage generated in a thin Pt layer deposited on films of yttrium iron garnet (YIG) have been carried out to study the spin pumping effect produced by magnetostatic (MS) modes excited by a microwave field. In relatively thick YIG films the modes are far apart so that one can identify clearly the spin pumping voltage in V{sub SP} produced by each MS mode. We have discovered that when the sputter deposition of the thin Pt layer is made on the YIG film magnetized by a static magnetic field, V{sub SP} exhibits a strong unidirectional anisotropy.

  18. Process for the separation and purification of yttrium-90 for medical applications

    DOEpatents

    Horwitz, P.E.; Dietz, M.L.

    1994-11-29

    An extraction chromatographic method for the preparation of [sup 90]Y of high chemical and radiochemical purity is disclosed. After an initial purification of a [sup 90]Sr stock solution and a suitable period of [sup 90]Y ingrowth, the solution is passed through a series of strontium-selective chromatographic columns, each of which lowers the [sup 90]Sr content of the mixture by a factor of about 10[sup 3]. The [sup 90]Y remaining is freed from any residual [sup 90]Sr, from its [sup 90]Zr daughter, and from any remaining impurities by passing the sample through a final column designed to selectively retain yttrium. 5 figures.

  19. Bond durability in erbium:yttrium–aluminum–garnet laser-irradiated enamel

    Microsoft Academic Search

    F. L. B. Amaral; V. Colucci; A. E. Souza-Gabriel; M. A. Chinelatti; R. G. Palma-Dibb; S. A. M. Corona

    2010-01-01

    This study sought to evaluate the influence of thermocycling and water storage on the microtensile bond strength of composite\\u000a resin bonded to erbium:yttrium–aluminum–garnet (Er:YAG)-irradiated and bur-prepared enamel. Eighty bovine incisors were selected\\u000a and sectioned. Specimens were ground to produce a flat enamel surface. Samples were randomly assigned according to cavity\\u000a preparation device: (I) Er:YAG laser and (II) high-speed turbine, and

  20. Eu 3+ doped yttrium oxysulfide nanocrystals - crystallite size and luminescence transition(s)

    NASA Astrophysics Data System (ADS)

    Dhanaraj, J.; Geethalakshmi, M.; Jagannathan, R.; Kutty, T. R. N.

    2004-03-01

    Nanocrystals of yttrium oxysulfide doped with trivalent europium has been synthesized using a two step sol-gel polymer thermolysis method employing urea formaldehyde resin in the presence of ethylene diamine tetra acetic acid as chelating agent. In this synthesis, marginal tunability in crystallite size ( ? = 7-15 nm) was achieved by varying the concentration of reactants and organic precursors. In this nanocrystalline system, various luminescence transitions, in particular 5D 0 ? 7F 2 transition of Eu 3+ shows moderate (˜ 60%) lifetime shortening which can be explained by considering possible increase in non-radiative rate ( ?nr) and also possible modification in optical electronegativity induced by surface states of the crystallites.

  1. Cooling of Er(3+) with Tm(3+) for accurate temperature sensing using yttrium silicate compact powders.

    PubMed

    Rakov, Nikifor; Maciel, Glauco S

    2014-11-14

    Er(3+) doped nanocrystalline powders are extensively used for thermometry based on luminescence spectral analysis. The luminescence from Er(3+) is produced by a nonlinear (two-photon) absorption process which may generate strong internal heat by activation of nonradiative relaxation channels. If the heat dissipation is not efficient, as is the case for compact powders, there will be inaccurate readings of the temperature. Our proposed solution is to cool down Er(3+) by transferring part of its accumulated energy to another rare-earth element in the lattice. Here, we show our results for Er(3+)-Tm(3+) co-doped yttrium silicate powders prepared by combustion synthesis. PMID:25232991

  2. Photoelectron spectroscopy of ultrathin yttrium oxide films on Si(1 0 0)

    Microsoft Academic Search

    A. Ohta; M. Yamaoka; S. Miyazaki

    2004-01-01

    The Y2O3\\/SiO2\\/Si(100) stack structures were prepared by the thermal decomposition of a yttrium organic complex in O2 ambient at 350 °C and subsequent O2-anneal at 500 °C. From the analysis of O1s energy loss spectra, the energy band gap was determined to be 6.0±0.05 eV for Y2O3 and 8.9±0.05 eV for interfacial SiO2. By deconvoluting the valence band spectra into

  3. HRTEM Study of yttrium oxide particles in ODS steels for fusion reactor application

    Microsoft Academic Search

    M. Klimiankou; R. Lindau; A. Möslang

    2003-01-01

    An oxide dispersion strengthened ferritic-martensitic steel with yttrium oxide (Y2O3) was produced by mechanical alloying and hot isostatic pressing techniques for high-performance structures of fusion energy devices. The structure of the nanometer-sized Y2O3 particles analysed by HRTEM shows a strong correlation of its crystallographic orientation with the alloy lattice. The orientation correlations [110]YO?[111]FeCr and (11?1?)YO?(11?0)FeCr were found. The strong orientation

  4. Optical Tuning of the Metal-Insulator Transition in Yttrium Hydride Films

    NASA Astrophysics Data System (ADS)

    Roy, A. S.; Hoekstra, A.; Rosenbaum, T. F.; Griessen, R.

    2000-03-01

    We have characterized the transport and magnetic behavior of thin films of Yttrium Hydride (YHx , 2 < x < 3 ) down to millikelvin temperatures. These films switch reversibly from metallic to insulating behavior as a function of the hydrogen content x. By illuminating with UV light, we demonstrate that it is possible to drive a film with fixed hydrogen content through the metal-insulator transition, and we examine the resulting resistivity curves to determine whether a scaling form describes the data. The system poses interesting questions concerning the role of electron correlations and disorder at a quantum critical point.

  5. Scaling at the Mott Hubbard metal insulator transition in yttrium hydride

    NASA Astrophysics Data System (ADS)

    Hoekstra, A. F. Th; Roy, A. S.; Rosenbaum, T. F.

    2003-03-01

    A single yttrium hydride thin film is conveniently driven through the T = 0 metal-insulator transition by fine-tuning the charge carrier density n via persistent photoconductivity at low temperature. Simultaneously, electrical conductivity and Hall measurements are performed for temperatures T down to 350 mK and magnetic fields up to 14 T. A scaling analysis is applied and critical exponents, resolved separately on the metallic and insulating sides of the critical region, are determined consistently. We introduce corrections to scaling to invoke collapse of the data onto a single master curve over an extended region of the (n, T) phase diagram.

  6. On the thermal Hall effect in the electrically insulating ferrimagnet yttrium iron garnet

    NASA Astrophysics Data System (ADS)

    Boona, Stephen R.; Heremans, Joseph P.

    2014-03-01

    This talk will present results from our recent experiments aimed at measuring the elements of the magneto-thermal conductivity tensor ?ijk of the electrically insulating ferrimagnet yttrium iron garnet (YIG). We will report evidence of a non-zero contribution from ?xyz, which suggests the existence of a thermal Hall effect in this material. We will discuss the ramifications of these results in relation to spin caloritronic experiments, as well as some possible concepts for thermal-to-electrical energy conversion applications based on this phenomenon. SRB is supported by the Center for Emergent Materials, an NSF MRSEC at The Ohio State University (Grant DMR-0820414); JPH by NSF-CBET-1133589.

  7. Effect of yttrium and lanthanum on the tensile creep behavior of aluminum oxide

    SciTech Connect

    Cho, J.; Harmer, M.P.; Chan, H.M.; Rickman, J.M.; Thompson, A.M. [Lehigh Univ., Bethlehem, PA (United States). Dept. of Materials Science and Engineering

    1997-04-01

    The tensile creep behavior of two rare-earth dopant systems, lanthanum- and yttrium-doped alumina, are compared and contrasted in order to better understand the role of oversized, isovalent cation dopants in determining creep behavior. It was found that, despite some microstructural differences, these systems displayed qualitatively a similar improvement in creep resistance, supporting the hypothesis that creep is strongly influenced by segregation. Differences in primary creep behavior and activation energy for steady-state creep were, however, observed for these systems. Given these results, it is expected that creep behavior can be further optimized by adjusting the dopant level and by controlling the microstructure.

  8. Integration of nonlinear dielectric barium strontium titanate with polycrystalline yttrium iron garnet

    NASA Astrophysics Data System (ADS)

    Jia, Q. X.; Groves, J. R.; Arendt, P.; Fan, Y.; Findikoglu, A. T.; Foltyn, S. R.; Jiang, H.; Miranda, F. A.

    1999-03-01

    Biaxially oriented nonlinear dielectric Ba0.6Sr0.4TiO3 (BST) films have been grown on polycrystalline ferrite yttrium iron garnet (YIG) substrates. We use a structurally and chemically compatible MgO buffer to improve the crystallinity of the BST on polycrystalline YIG substrates, where the biaxially oriented MgO is deposited by an ion-beam assisted-deposition technique. The biaxially oriented BST has a dielectric loss of less than 0.01 and a capacitance tunability of greater than 25% at a direct current bias voltage of 40 V at room temperature.

  9. Preparation and electrical properties of yttrium-doped strontium titanate with B-site deficiency

    Microsoft Academic Search

    Feng Gao; Hailei Zhao; Xue Li; Yunfei Cheng; Xiong Zhou; Fenge Cui

    2008-01-01

    Yttrium-doped strontium titanate with B-site deficiency (Y0.08Sr0.92Ti1?xO3??) is synthesized via conventional solid-state reaction. The effect of B-site deficiency on the lattice parameter, sinterability, microstructure and electrical properties of Y0.08Sr0.92TiO3?? is investigated. The charge compensation mechanism for B-site deficiency is proposed. The limit of B-site deficiency in Y0.08Sr0.92Ti1?xO3?? is below 5mol % in Ar with 5% H2 at 1500°C. The sinterability

  10. Enhanced UV and suppressed defect related emission in yttrium doped zinc oxide

    SciTech Connect

    Sharma, Vikas; Vyas, Rishi; Sachdev, K. [Department of Physics, Malaviya National Institute of Technology, Jaipur - 302017 (India); Kumar, Parmod, E-mail: parmodphysics@gmail.com; Malik, Hitendra K. [Department of Physics, Indian Institute of Technology Delhi, New Delhi - 110016 (India); Rana, Geeta [Department of Physics, G. B. Pant University of Agriculture and Technology, Pantnagar - 263145 (India); Asokan, K. [Material Science Division, Inter University Accelerator Centre, New Delhi - 110067 (India)

    2014-04-24

    Yttrium doped ZnO (YZO) synthesized through conventional solid state reaction method using ZnO and Y{sub 2}O{sub 3} as starting material. The formation of YZO compounds were confirmed by X-ray diffraction and Raman spectroscopy. Photoluminescence measurements revealed an enhanced ultra-violet (UV) and suppressed defect related emission in YZO which is due to reduction in the concentration of the defects related to oxygen interstitials (O{sub i}) and zinc vacancy (V{sub Zn}) of ZnO.

  11. Structural studies on the yttrium-doped cobalt ferrite powders synthesized by sol-gel combustion method

    NASA Astrophysics Data System (ADS)

    Shobana, M. K.; Kwon, Hoon; Choe, Heeman

    2012-07-01

    Y0.2CoFe1.8O4 nanopowders were prepared using a sol-gel combustion method. Metal nitrates, such as yttrium nitrate, cobalt nitrate and ferric nitrate, were used as the source materials. Citric acid and polyvinyl alcohol were used as the burning agent and agglomeration reducing agent, respectively. The pH of the precursor was maintained at 7. The mean crystallite size of the prepared ferrite was in the range of ?20-70 nm. The inverse spinel structure, cubic morphology, and the identification of functional groups of the yttrium-doped cobalt ferrite were analyzed systematically using several analytical tools.

  12. Effect of yttrium additions on the tensile properties and hardness of an iron-nickel-chromium alloy. [LMFBR

    SciTech Connect

    Shah-Khan, M.Z.

    1981-10-01

    Results of the research work show that the addition of 0.1% yttrium does not significantly change the mechanical properties of the AL1 alloy with temperature (even though the yttrium-doped samples did show a slight increase in yield stress and hardness for tests above 700/sup 0/C); the room temperature strength of the undoped AL1 alloy increases upon annealing at temperatures above 600/sup 0/C; and the room temperature uniform and fracture strains of the undoped AL1 alloy decrease upon annealing at temperatures above 600/sup 0/C.

  13. 88. VIEW LOOKING FROM THE BRIDGE FROM THE MARLBOROUGH HOTEL ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    88. VIEW LOOKING FROM THE BRIDGE FROM THE MARLBOROUGH HOTEL TOWARD THE READING LOUNGE OUTSIDE OF THE MAIN DINING ROOM OF THE BLENHEIM HOTEL - Blenheim Hotel, Ohio Avenue & Boardwalk, Atlantic City, Atlantic County, NJ

  14. 45 CFR 88.4 - Requirements and prohibitions.

    Code of Federal Regulations, 2010 CFR

    2010-10-01

    ...DISCRIMINATORY POLICIES OR PRACTICES § 88.4 Requirements...would be contrary to his religious beliefs or moral convictions, or because of his religious beliefs or moral convictions...with the applicant's religious beliefs or moral...

  15. Genetics Home Reference: MyD88 deficiency

    MedlinePLUS

    ... the body's early, nonspecific response to foreign invaders (pathogens). MyD88 deficiency leads to abnormally frequent and severe ... pathway that is involved in early recognition of pathogens and the initiation of inflammation to fight infection. ...

  16. 9 CFR 88.6 - Violations and penalties.

    Code of Federal Regulations, 2011 CFR

    2011-01-01

    ...POULTRY) AND ANIMAL PRODUCTS COMMERCIAL TRANSPORTATION OF EQUINES FOR SLAUGHTER § 88.6 Violations and penalties. ...violation of any of the regulations in this part. (b) Each equine transported in violation of the regulations of this part...

  17. 9 CFR 88.6 - Violations and penalties.

    Code of Federal Regulations, 2010 CFR

    2010-01-01

    ...POULTRY) AND ANIMAL PRODUCTS COMMERCIAL TRANSPORTATION OF EQUINES FOR SLAUGHTER § 88.6 Violations and penalties. ...violation of any of the regulations in this part. (b) Each equine transported in violation of the regulations of this part...

  18. 9 CFR 88.3 - Standards for conveyances.

    Code of Federal Regulations, 2011 CFR

    2011-01-01

    ...PRODUCTS COMMERCIAL TRANSPORTATION OF EQUINES FOR SLAUGHTER § 88.3 Standards for...used for the commercial transportation of equines to slaughtering facilities must: ...protects the health and well-being of the equines being transported (e.g.,...

  19. 9 CFR 88.5 - Requirements at a slaughtering facility.

    Code of Federal Regulations, 2011 CFR

    2011-01-01

    ...PRODUCTS COMMERCIAL TRANSPORTATION OF EQUINES FOR SLAUGHTER § 88.5 Requirements...shipper must: (1) Ensure that each equine has access to appropriate food and potable...Allow a USDA representative access to the equines for the purpose of examination;...

  20. 9 CFR 88.3 - Standards for conveyances.

    Code of Federal Regulations, 2010 CFR

    2010-01-01

    ...PRODUCTS COMMERCIAL TRANSPORTATION OF EQUINES FOR SLAUGHTER § 88.3 Standards for...used for the commercial transportation of equines to slaughtering facilities must: ...protects the health and well-being of the equines being transported (e.g.,...

  1. 42 CFR 88.7 - Eligibility-currently identified survivors.

    Code of Federal Regulations, 2012 CFR

    2012-10-01

    ...SERVICE, DEPARTMENT OF HEALTH AND HUMAN SERVICES OCCUPATIONAL SAFETY AND HEALTH RESEARCH AND RELATED ACTIVITIES WORLD TRADE CENTER HEALTH PROGRAM § 88.7 Eligibility—currently identified survivors. (a) Survivors who have been...

  2. 42 CFR 88.3 - Eligibility-currently identified responders.

    Code of Federal Regulations, 2012 CFR

    2012-10-01

    ...SERVICE, DEPARTMENT OF HEALTH AND HUMAN SERVICES OCCUPATIONAL SAFETY AND HEALTH RESEARCH AND RELATED ACTIVITIES WORLD TRADE CENTER HEALTH PROGRAM § 88.3 Eligibility—currently identified responders. (a) Responders who were...

  3. 42 CFR 88.3 - Eligibility-currently identified responders.

    Code of Federal Regulations, 2014 CFR

    2014-10-01

    ...SERVICE, DEPARTMENT OF HEALTH AND HUMAN SERVICES OCCUPATIONAL SAFETY AND HEALTH RESEARCH AND RELATED ACTIVITIES WORLD TRADE CENTER HEALTH PROGRAM § 88.3 Eligibility—currently identified responders. (a) Responders who were...

  4. 42 CFR 88.7 - Eligibility-currently identified survivors.

    Code of Federal Regulations, 2014 CFR

    2014-10-01

    ...SERVICE, DEPARTMENT OF HEALTH AND HUMAN SERVICES OCCUPATIONAL SAFETY AND HEALTH RESEARCH AND RELATED ACTIVITIES WORLD TRADE CENTER HEALTH PROGRAM § 88.7 Eligibility—currently identified survivors. (a) Survivors who have been...

  5. 42 CFR 88.14 - Standard for determining medical necessity.

    Code of Federal Regulations, 2013 CFR

    2013-10-01

    ...OCCUPATIONAL SAFETY AND HEALTH RESEARCH AND RELATED ACTIVITIES WORLD TRADE CENTER HEALTH PROGRAM § 88.14 Standard for determining...the medical treatment protocols developed by the Data Centers and approved by the WTC Program...

  6. 42 CFR 88.7 - Eligibility-currently identified survivors.

    Code of Federal Regulations, 2011 CFR

    2011-10-01

    ...SERVICE, DEPARTMENT OF HEALTH AND HUMAN SERVICES OCCUPATIONAL SAFETY AND HEALTH RESEARCH AND RELATED ACTIVITIES WORLD TRADE CENTER HEALTH PROGRAM § 88.7 Eligibility—currently identified survivors. (a) Survivors who have been...

  7. 42 CFR 88.14 - Standard for determining medical necessity.

    Code of Federal Regulations, 2011 CFR

    2011-10-01

    ...OCCUPATIONAL SAFETY AND HEALTH RESEARCH AND RELATED ACTIVITIES WORLD TRADE CENTER HEALTH PROGRAM § 88.14 Standard for determining...the medical treatment protocols developed by the Data Centers and approved by the WTC Program...

  8. 42 CFR 88.14 - Standard for determining medical necessity.

    Code of Federal Regulations, 2014 CFR

    2014-10-01

    ...OCCUPATIONAL SAFETY AND HEALTH RESEARCH AND RELATED ACTIVITIES WORLD TRADE CENTER HEALTH PROGRAM § 88.14 Standard for determining...the medical treatment protocols developed by the Data Centers and approved by the WTC Program...

  9. 42 CFR 88.15 - Appeals regarding treatment.

    Code of Federal Regulations, 2012 CFR

    2012-10-01

    ...SERVICE, DEPARTMENT OF HEALTH AND HUMAN SERVICES OCCUPATIONAL SAFETY AND HEALTH RESEARCH AND RELATED ACTIVITIES WORLD TRADE CENTER HEALTH PROGRAM § 88.15 Appeals regarding treatment. (a) Individuals may appeal the following...

  10. 42 CFR 88.3 - Eligibility-currently identified responders.

    Code of Federal Regulations, 2013 CFR

    2013-10-01

    ...SERVICE, DEPARTMENT OF HEALTH AND HUMAN SERVICES OCCUPATIONAL SAFETY AND HEALTH RESEARCH AND RELATED ACTIVITIES WORLD TRADE CENTER HEALTH PROGRAM § 88.3 Eligibility—currently identified responders. (a) Responders who were...

  11. 42 CFR 88.15 - Appeals regarding treatment.

    Code of Federal Regulations, 2013 CFR

    2013-10-01

    ...SERVICE, DEPARTMENT OF HEALTH AND HUMAN SERVICES OCCUPATIONAL SAFETY AND HEALTH RESEARCH AND RELATED ACTIVITIES WORLD TRADE CENTER HEALTH PROGRAM § 88.15 Appeals regarding treatment. (a) Individuals may appeal the following...

  12. 42 CFR 88.7 - Eligibility-currently identified survivors.

    Code of Federal Regulations, 2013 CFR

    2013-10-01

    ...SERVICE, DEPARTMENT OF HEALTH AND HUMAN SERVICES OCCUPATIONAL SAFETY AND HEALTH RESEARCH AND RELATED ACTIVITIES WORLD TRADE CENTER HEALTH PROGRAM § 88.7 Eligibility—currently identified survivors. (a) Survivors who have been...

  13. 42 CFR 88.15 - Appeals regarding treatment.

    Code of Federal Regulations, 2014 CFR

    2014-10-01

    ...SERVICE, DEPARTMENT OF HEALTH AND HUMAN SERVICES OCCUPATIONAL SAFETY AND HEALTH RESEARCH AND RELATED ACTIVITIES WORLD TRADE CENTER HEALTH PROGRAM § 88.15 Appeals regarding treatment. (a) Individuals may appeal the following...

  14. 42 CFR 88.3 - Eligibility-currently identified responders.

    Code of Federal Regulations, 2011 CFR

    2011-10-01

    ...SERVICE, DEPARTMENT OF HEALTH AND HUMAN SERVICES OCCUPATIONAL SAFETY AND HEALTH RESEARCH AND RELATED ACTIVITIES WORLD TRADE CENTER HEALTH PROGRAM § 88.3 Eligibility—currently identified responders. (a) Responders who were...

  15. 42 CFR 88.15 - Appeals regarding treatment.

    Code of Federal Regulations, 2011 CFR

    2011-10-01

    ...SERVICE, DEPARTMENT OF HEALTH AND HUMAN SERVICES OCCUPATIONAL SAFETY AND HEALTH RESEARCH AND RELATED ACTIVITIES WORLD TRADE CENTER HEALTH PROGRAM § 88.15 Appeals regarding treatment. (a) Individuals may appeal the following...

  16. 42 CFR 88.14 - Standard for determining medical necessity.

    Code of Federal Regulations, 2012 CFR

    2012-10-01

    ...OCCUPATIONAL SAFETY AND HEALTH RESEARCH AND RELATED ACTIVITIES WORLD TRADE CENTER HEALTH PROGRAM § 88.14 Standard for determining...the medical treatment protocols developed by the Data Centers and approved by the WTC Program...

  17. 14 CFR 33.88 - Engine overtemperature test.

    Code of Federal Regulations, 2012 CFR

    2012-01-01

    ...STANDARDS: AIRCRAFT ENGINES Block Tests; Turbine Aircraft Engines § 33.88 Engine...OEI ratings. Following this run, the turbine assembly must be within serviceable limits...OEI rating. Following this run, the turbine assembly may exhibit distress...

  18. 14 CFR 33.88 - Engine overtemperature test.

    Code of Federal Regulations, 2010 CFR

    2010-01-01

    ...STANDARDS: AIRCRAFT ENGINES Block Tests; Turbine Aircraft Engines § 33.88 Engine...OEI ratings. Following this run, the turbine assembly must be within serviceable limits...OEI rating. Following this run, the turbine assembly may exhibit distress...

  19. 14 CFR 33.88 - Engine overtemperature test.

    Code of Federal Regulations, 2014 CFR

    2014-01-01

    ...STANDARDS: AIRCRAFT ENGINES Block Tests; Turbine Aircraft Engines § 33.88 Engine...OEI ratings. Following this run, the turbine assembly must be within serviceable limits...OEI rating. Following this run, the turbine assembly may exhibit distress...

  20. 14 CFR 33.88 - Engine overtemperature test.

    Code of Federal Regulations, 2011 CFR

    2011-01-01

    ...STANDARDS: AIRCRAFT ENGINES Block Tests; Turbine Aircraft Engines § 33.88 Engine...OEI ratings. Following this run, the turbine assembly must be within serviceable limits...OEI rating. Following this run, the turbine assembly may exhibit distress...

  1. 14 CFR 33.88 - Engine overtemperature test.

    Code of Federal Regulations, 2013 CFR

    2013-01-01

    ...STANDARDS: AIRCRAFT ENGINES Block Tests; Turbine Aircraft Engines § 33.88 Engine...OEI ratings. Following this run, the turbine assembly must be within serviceable limits...OEI rating. Following this run, the turbine assembly may exhibit distress...

  2. 42 CFR 32.88 - Examinations and treatment.

    Code of Federal Regulations, 2011 CFR

    2011-10-01

    ...HEALTH AND HUMAN SERVICES MEDICAL CARE AND EXAMINATIONS MEDICAL CARE FOR PERSONS WITH HANSEN'S DISEASE AND OTHER PERSONS IN EMERGENCIES Persons with Hansen's Disease § 32.88 Examinations and treatment. Patients will be provided...

  3. 42 CFR 32.88 - Examinations and treatment.

    Code of Federal Regulations, 2010 CFR

    2010-10-01

    ...HEALTH AND HUMAN SERVICES MEDICAL CARE AND EXAMINATIONS MEDICAL CARE FOR PERSONS WITH HANSEN'S DISEASE AND OTHER PERSONS IN EMERGENCIES Persons with Hansen's Disease § 32.88 Examinations and treatment. Patients will be provided...

  4. 88. DETAIL OF 'LOCATION 25' EQUIPMENT CABINET CONTAINING AUTOPILOT GYRO ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    88. DETAIL OF 'LOCATION 25' EQUIPMENT CABINET CONTAINING AUTOPILOT GYRO MONITORS AND TAPE PUNCH - Vandenberg Air Force Base, Space Launch Complex 3, Launch Operations Building, Napa & Alden Roads, Lompoc, Santa Barbara County, CA

  5. 28 CFR 2.88 - Confidentiality of parole records.

    Code of Federal Regulations, 2010 CFR

    2010-07-01

    ...Judicial Administration DEPARTMENT OF JUSTICE PAROLE, RELEASE, SUPERVISION AND RECOMMITMENT OF PRISONERS, YOUTH OFFENDERS, AND JUVENILE DELINQUENTS District of Columbia Code: Prisoners and Parolees § 2.88 Confidentiality of parole...

  6. WSR-88D Polar-to-HRAP Mapping

    Microsoft Academic Search

    Richard A. Fulton

    The WSR-88D rainfall algorithm generates a one-hour rainfall product that has been remapped from a local, radar-centered, polar grid into the national, quasi- rectangular HRAP grid of nominal grid size of 4 km x 4 km. This report describes the way that the polar-to-HRAP coordinate transformation is performed within the WSR- 88D algorithm. It also compares the latitude-longitude grid cell

  7. Unresponsiveness of MyD88Deficient Mice to Endotoxin

    Microsoft Academic Search

    Taro Kawai; Osamu Adachi; Tomohiko Ogawa; Kiyoshi Takeda; Shizuo Akira

    1999-01-01

    MyD88 is a general adaptor protein that plays an important role in the Toll\\/IL-1 receptor family signalings. Recently, Toll-like receptors 2 and 4 (TLR2 and TLR4) have been suggested to be the signaling receptors for lipopolysaccharide (LPS). In this study, we demonstrate that MyD88 knockout mice lack the ability to respond to LPS as measured by shock response, B cell

  8. Recording, archiving, and using WSR-88D data

    Microsoft Academic Search

    Timothy D. Crum; Ron L. Alberty; Donald W. Burgess

    1993-01-01

    In order to support NEXRAD program requirements, WSR-88D systems have the capability to record data and products at four levels. Of these, level II (base data) and level III (products) will be most commonly available for various applications by a wide range of users. This paper overviews the data-recording capabilities of the WSR-88D system, plans for recording and archiving these

  9. Exceptional Field Theory III: E$_{8(8)}$

    E-print Network

    Olaf Hohm; Henning Samtleben

    2014-10-02

    We develop exceptional field theory for E$_{8(8)}$, defined on a (3+248)-dimensional generalized spacetime with extended coordinates in the adjoint representation of E$_{8(8)}$. The fields transform under E$_{8(8)}$ generalized diffeomorphisms and are subject to covariant section constraints. The bosonic fields include an `internal' dreibein and an E$_{8(8)}$-valued `zweihundertachtundvierzigbein' (248-bein). Crucially, the theory also features gauge vectors for the E$_{8(8)}$ E-bracket governing the generalized diffeomorphism algebra and covariantly constrained gauge vectors for a separate but constrained E$_{8(8)}$ gauge symmetry. The complete bosonic theory, with a novel Chern-Simons term for the gauge vectors, is uniquely determined by gauge invariance under internal and external generalized diffeomorphisms. The theory consistently comprises components of the dual graviton encoded in the 248-bein. Upon picking particular solutions of the constraints the theory reduces to D=11 or type IIB supergravity, for which the dual graviton becomes pure gauge. This resolves the dual graviton problem, as we discuss in detail.

  10. Zebrafish ift57, ift88, and ift172 intraflagellar transport mutants disrupt cilia but do not affect Hedgehog signaling

    PubMed Central

    Lunt, Shannon C.; Haynes, Tony; Perkins, Brian D.

    2009-01-01

    Cilia formation requires intraflagellar transport (IFT) proteins. Recent studies indicate that mammalian Hedgehog (Hh) signaling requires cilia. It is unclear, however, if the requirement for cilia and IFT proteins in Hh signaling represents a general rule for all vertebrates. Here we examine zebrafish ift57, ift88, and ift172 mutants and morphants for defects in Hh signaling. Although ift57 and ift88 mutants and morphants contained residual maternal protein, the cilia were disrupted. In contrast to previous genetic studies in mouse, mutations in zebrafish IFT genes did not affect the expression of Hh target genes in the neural tube and forebrain and had no quantitative effect on Hh target gene expression. Zebrafish IFT mutants also exhibited no dramatic changes in the craniofacial skeleton, somite formation, or motor neuron patterning. Thus, our data indicate the requirement for cilia in the Hh signal transduction pathway may not represent a universal mechanism in vertebrates. PMID:19517571

  11. Sinomenine decreases MyD88 expression and improves inflammation-induced joint damage progression and symptoms in rat adjuvant-induced arthritis.

    PubMed

    Mu, Hui; Yao, Ru-Bing; Zhao, Ling-Jie; Shen, Si-Yu; Zhao, Zhi-Ming; Cai, Hui

    2013-10-01

    Sinomenine (SIN) is the active principle of the Chinese medical plant Sinomenium acutum which is widely used for the treatment of rheumatoid arthritis (RA) in China. Recently, several groups indicated that myeloid differentiation primary response protein 88 (MyD88) might be associated with disease progression of RA. Here, we observed the effect of SIN on MyD88 expression and showed its therapeutic role in RA. First, immunohistochemical staining in clinical specimens showed that MyD88 was mainly located in characteristic pathological structures of RA synovial tissues. Second, we found that MyD88 was overexpressed in the synovial tissues of the rats with adjuvant-induced arthritis (AIA). Treatment with SIN markedly decreased the expression of MyD88 in AIA rats. Finally, we provided evidences that SIN suppressed inflammation response and inflammation-induced joint destructive progression and arthritis symptoms in AIA rats. Therefore, SIN is an effective therapeutic agent for RA. Targeting MyD88 signaling may provide new methods for the treatment of RA. PMID:23605561

  12. Effect of loaded silver nanoparticles on TiO 2 for photocatalytic degradation of Acid Red 88

    Microsoft Academic Search

    S. Anandan; P. Sathish Kumar; N. Pugazhenthiran; J. Madhavan; P. Maruthamuthu

    2008-01-01

    Nanometer sized Ag–TiO2 nanoparticles were prepared (by photoreduction of Ag+ ions) in order to assess its photocatalytic degradation ability of target pollutant (textile dye; Acid red 88) upon visible light irradiation. Furthermore, oxidative reagents such as peroxomonosulfate (PMS), peroxodisulfate (PDS) and hydrogen peroxide (H2O2) were added to the photocatalytic system, which may act as an alternative electron acceptor and result

  13. Effect of Yttrium on Dielectric, Pyroelectric and Piezoelectric Properties of Pbn Ferroelectrics

    NASA Astrophysics Data System (ADS)

    Sambasiva Rao, K.; Vallis Nath, N.; Murali Krishna, P.; Madhava Prasad, D.; Lee, Joon Hyung

    Materials with batch formula Pb(1-x-3y/2)RyBaxNb2O6, where R=Y, (1-x)=0.73, 0.63, 0.53 and y=0.00, 0.02 have been prepared by the double sintering method. Substitution of yttrium (Y) restored tetragonal symmetry of PBN but reduced lattice parameters, cell volume and enhanced the density. Transition temperature of PBN has decreased due to the substitution of Y3+. Enhanced room temperature spontaneous polarization (Ps)=149.97 ?C/sq. cm has been observed in PBN53, which is above MPB, whereas enhanced value of Ps=112.74 ?C/sq. cm is found in Y: PBN63 at MPB region. The room temperature Pyroelectric coefficient (PRT=1.07) has been observed in the composition where maximum volume of Ps is obtained. Similarly, enhanced values of piezoelectric coefficients Kp=0.244, Kt=0.353, K31=0.131, d31=60, d33=159 and g31=3.65 have also been found in the same material PBN53. Substitution of Yttrium enhanced the stiffness constant 13.59 in PBN 73 to 14.27 of Y: PBN73.

  14. Mechanistic study of the selective catalytic reduction of nitric oxide with methane over yttrium oxide

    SciTech Connect

    Fokema, M.D.; Ying, J.Y.

    2000-05-15

    The catalytic activity of nanocrystalline Group IIIB metal oxides for the reduction of nitric oxide with methane was shown to be comparable to that of Co-ZSM-5. The mechanism of selective catalytic reduction of nitric oxide with methane in excess oxygen was examined over nanocrystalline yttrium oxide. A series of heterogeneous and homogeneous reaction steps was proposed to account for the observed trends in catalytic properties. Methyl radicals generated at the catalyst surface desorb into the gas phase, where they react with nitric oxide to form nitrosomethane. Nitrosomethane then decomposes in a series of homogeneous and heterogeneous reactions to produce nitrogen and nitrous oxide. Evidence for gas-phase reaction of methyl radicals with nitric oxide was found in the adsorption studies of nitric oxide on yttrium oxide, the presence of ethane and ethene in the reactor effluent, catalytic studies involving nitrosomethane and nitromethane, as well as the successful prediction of methane selectivities based on a homogeneous reaction mechanism for methyl radical consumption. The proposed pathway for nitrogen production was supported by the observation of hydrogen cyanide under certain operating conditions, as well as adsorbed NCO species detected by infrared spectroscopy.

  15. Microstructure, microhardness, and biocompatibility characteristics of yttrium hydroxyapatite doped with fluoride.

    PubMed

    Toker, S M; Tezcaner, A; Evis, Z

    2011-02-01

    The current study focused on doping of hydroxyapatite (HA) with constant yttrium (Y(3+) ) and varying fluoride (F(-) ) compositions to investigate its microstructure, microhardness, and biocompatibility. HA was synthesized by precipitation method and sintered at 1100°C for 1 h. Y(3+) and F(-) ion dopings resulted in changes in densities. In x-ray diffraction analysis, no secondary phase formation was observed. Lattice parameters decreased upon ion substitutions. Scanning electron microscopy (SEM) results showed that ion addition resulted in smaller grains. In Fourier transform infrared spectroscopy analysis, F(-) ion substitution was confirmed. HA doped with 2.5% Y(3+) and 1% F(-) exhibited the highest microhardness. Y(3+) and F(-) ions improved Saos-2 cell proliferation on discs in Methylthiazolyldiphenyl-tetrazolium (MTT) assay. In SEM analysis, cells attached and proliferated on all disc surfaces. Alkaline phosphatase (ALP) assay showed that cell differentiation on the discs was improved by doping HA with an optimum F(-) amount. Dissolution tests revealed that structural stability of HA was improved with F(-) ion incorporation. The dissolution behavior of fluoridated samples exhibited a parallel pattern with the cell proliferation and differentiation behavior on these samples. Overall, this work shows that fluoride and yttrium cosubstitution into HA HA2.5Y1F was the most promising material for biomedical applications. PMID:21210499

  16. Synthesis and optical properties of powders of lutetium and yttrium double phosphates-doped by ytterbium

    NASA Astrophysics Data System (ADS)

    Guzik, M.; Legendziewicz, J.; Szuszkiewicz, W.; Walasek, A.

    2007-06-01

    This contribution is devoted to the new ytterbium-doped alkali metal lutetium double phosphates and their structural and spectroscopic characterisations. The absorption, emission and excitation spectra have been measured at 4, 10 and 293 K in the VUV to IR range. The results have been compared with the analogous yttrium phosphates. The luminescence spectra of the double phosphates have been recorded using various excitation lines, including the synchrotron radiation. The low temperature absorption and emission spectra in the region of the 2F 7/2 ? 2F 5/2 transition together with the IR spectra have been used to assign the electronic and vibronic components. Detailed analysis of the Yb 3+-doped sodium lutetium double phosphates has been performed to determine the energy levels in these hosts and to compare their optical behaviour with analogous sodium yttrium double phosphates. The emission and excitation spectra have been investigated using synchrotron radiation and the origin of the emission has been analysed proving that the emission occurs from the charge transfer state.

  17. A study on the effect factors of sol-gel synthesis of yttrium aluminum garnet nanopowders

    NASA Astrophysics Data System (ADS)

    Yang, Lin; Lu, Tiecheng; Xu, Hui; Zhang, Wei; Ma, Benyuan

    2010-03-01

    Yttrium aluminum garnet (YAG) nanopowders were synthesized by sol-gel method using aluminum nitrate, yttrium nitrate, and citric acid as starting materials, de-ionized water, ethanol, and ethylene glycol as solvents, respectively. The phase formation process, state of particle size distribution (PSD), compositions, morphological characteristics, and thermal behavior of the powders were investigated by means of x-ray diffractometry, PSD, Fourier transform infrared, transmission electronic microscope, and thermogravimetry-differential scanning calorimetry. Results indicate that the formation and characteristics of precursor gel and YAG powder, such as the rate of gelation, average particle size, and powder agglomerate state, strongly depend on the stoichiometric amount of citric acid, the solvent composition, and the precalcination process. Highly crystalline, well-dispersed YAG nanopowder was obtained by calcining at 800 °C for 2 h in the presence of citric acid to nitrate ratio of 3, ethanol solvent, and precalcination process. According to the analysis of experimental results, sol-gel chemistry, DLVO theory, and steric effect, the effects of stoichiometric amount of citric acid, solvent composition, and precalcination process on the formation and characteristics of precursor gel and YAG powder have been discussed. Meanwhile, the overall synthesis mechanism in sol-gel method has been suggested.

  18. The magnetic structures of holmium-yttrium superlattices in an applied magnetic field

    NASA Astrophysics Data System (ADS)

    de la Fuente, C.; Cowley, R. A.; Goff, J. P.; Ward, R. C. C.; Wells, M. R.; McMorrow, D. F.

    1999-08-01

    The magnetic structures of a rare earth superlattice in an applied magnetic field have been determined using neutron scattering techniques. The sample was grown using the LaMBE facility in Oxford and the periodic unit consisted of 41 planes of holmium and 16 planes of yttrium. The results showed four different types of magnetic phase corresponding to the helix, helifan, fan and ferromagnetic phases observed when a magnetic field is applied in the basal plane of bulk holmium. In the superlattice the correlation length was very long for the ferromagnetic phase, about 10 superlattice periods for the helix, about 4 superlattice periods for the fan and there was little, if any, correlation between the superlattice blocks for the helifan phase. The structures depended in detail upon the history in field and temperature as the configuration was approached. The most striking aspect of the result is that the helical phase is stable to higher fields in the superlattice than in the bulk. It is argued that this is because the conduction electron susceptibility in yttrium favours a modulated structure more strongly than in holmium and that the propagation of conduction electrons throughout the superlattice transfers this enhancement to the holmium blocks.

  19. Thermal stability studies of plasma sprayed yttrium oxide coatings deposited on pure tantalum substrate

    NASA Astrophysics Data System (ADS)

    Nagaraj, A.; Anupama, P.; Mukherjee, Jaya; Sreekumar, K. P.; Satpute, R. U.; Padmanabhan, P. V. A.; Gantayet, L. M.

    2010-02-01

    Plasma sprayed Yttrium oxide is used for coating of crucibles and moulds that are used at high temperature to handle highly reactive molten metals like uranium, titanium, chromium, and beryllium. The alloy bond layer is severely attacked by the molten metal. This commonly used layer contributes to the impurity addition to the pure liquid metal. Yttrium oxide was deposited on tantalum substrates (25 mm × 10mm × 1mm thk and 40 mm × 8mm × 1mm thk) by atmospheric plasma spray technique with out any bond coat using optimized coating parameters. Resistance to thermal shock was evaluated by subjecting the coated specimens, to controlled heating and cooling cycles between 300K to 1600K in an induction furnace in argon atmosphere having <= 0.1ppm of oxygen. The experiments were designed to examine the sample tokens by both destructive and non-destructive techniques, after a predetermined number of thermal cycles. The results upto 24 thermal cycles of 25 mm × 10mm × 1mm thk coupons and upto 6 cycles of 40 mm × 8mm × 1mm thk coupons are discussed. The coatings produced with the optimized parameters were found to exhibit excellent thermal shock resistance.

  20. Thermo-optical characteristics and concentration quenching effects in Nd3+ doped yttrium calcium borate glasses.

    PubMed

    Santos, D R S; Santos, C N; de Camargo, A S S; Silva, W F; Santos, W Q; Vermelho, M V D; Astrath, N G C; Malacarne, L C; Li, M S; Hernandes, A C; Ibanez, A; Jacinto, C

    2011-03-28

    In this work we present a comprehensive study of the spectroscopic and thermo-optical properties of a set of samples with composition xNd(2)O(3)-(5-x)Y(2)O(3-)40CaO-55B(2)O(3) (0 ? x ? 1.0 mol%). Their fluorescence quantum efficiency (?) values were determined using the thermal lens technique and the dependence on the ionic concentration was analyzed in terms of energy transfer processes, based on the Förster-Dexter model of multipolar ion-ion interactions. A maximum ? = 0.54 was found to be substantially higher than for yttrium aluminoborate crystals and glasses with comparable Nd(3+) content. As for the thermo-optical properties of yttrium calcium borate, they are comparable to other well-known laser glasses. The obtained energy transfer microparameters and the weak dependence of ? on the Nd(3+) concentration with a high optimum Nd(3+) concentration put this system as a strong candidate for photonics applications. PMID:21456672

  1. Thermo-optical characteristics and concentration quenching effects in Nd3+doped yttrium calcium borate glasses

    NASA Astrophysics Data System (ADS)

    Santos, D. R. S.; Santos, C. N.; de Camargo, A. S. S.; Silva, W. F.; Santos, W. Q.; Vermelho, M. V. D.; Astrath, N. G. C.; Malacarne, L. C.; Li, M. S.; Hernandes, A. C.; Ibanez, A.; Jacinto, C.

    2011-03-01

    In this work we present a comprehensive study of the spectroscopic and thermo-optical properties of a set of samples with composition xNd2O3-(5-x)Y2O3-40CaO-55B2O3 (0 ? x ? 1.0 mol%). Their fluorescence quantum efficiency (?) values were determined using the thermal lens technique and the dependence on the ionic concentration was analyzed in terms of energy transfer processes, based on the Förster-Dexter model of multipolar ion-ion interactions. A maximum ? = 0.54 was found to be substantially higher than for yttrium aluminoborate crystals and glasses with comparable Nd3+ content. As for the thermo-optical properties of yttrium calcium borate, they are comparable to other well-known laser glasses. The obtained energy transfer microparameters and the weak dependence of ? on the Nd3+ concentration with a high optimum Nd3+ concentration put this system as a strong candidate for photonics applications.

  2. Glutathione S-Transferase 8-8 Expression Is Lower in Alcohol-Preferring Than in Alcohol-Nonpreferring Rats

    PubMed Central

    Liang, Tiebing; Habegger, Kirk; Spence, John P.; Foroud, Tatiana; Ellison, Julie A.; Lumeng, Lawrence; Li, Ting-Kai; Carr, Lucinda G.

    2015-01-01

    Objective A primary focus of alcohol research is to provide novel targets for alcohol treatment by identifying genes that predispose individuals to drink alcohol. Animal models of alcoholism developed by selective breeding are invaluable tools to elucidate both the genetic nature and the underlying biological mechanisms that contribute to alcohol dependence. These selected lines (high alcohol preferring and low alcohol preferring) display phenotypic and genetic differences that can be studied to further our understanding of alcohol preference and related genetic traits. By combining molecular techniques, genetic and physiological factors that underlie the cause of alcoholism can be identified. Methods Total gene expression analysis was used to identify genes that are differentially expressed in specific brain regions between alcohol-naïve, inbred alcohol-preferring (iP) and -nonpreferring (iNP) rats. Quantitative reverse transcriptase–polymerase chain reaction, in situ hybridization, Western blot, and sequence analysis were used to further characterize rat glutathione S-transferase 8-8 (rGST 8-8). Results Lower expression of rGST 8-8 mRNA was observed in discrete brain regions of iP compared with iNP animals, and these expression differences were confirmed. To determine additional expression patterns of rGST 8-8, we used in situ hybridization. Rat GST 8-8 was highly expressed in hippocampus, the choroid plexus of the dorsal third ventricle and the lateral ventricle, and ependymal cells along the dorsal third ventricle and the third ventricle. Western blot analysis showed that rGST 8-8 protein levels were lower in the hippocampus and the amygdala of iP compared with iNP. A silent single-nucleotide polymorphism in the coding region and three single-nucleotide polymorphisms in the 3?-UTR were identified in the rGST 8-8 cDNA. Conclusion There is regional variation of rGST 8-8 expression in the brain, at both the mRNA and protein level, and the iP strain has lower innate rGST 8-8 levels than the iNP strain in discrete brain regions. PMID:15547447

  3. Adjuvant heparanase inhibitor PI-88 therapy for hepatocellular carcinoma recurrence

    PubMed Central

    Liu, Chun-Jen; Chang, Juliana; Lee, Po-Huang; Lin, Deng-Yn; Wu, Cheng-Chung; Jeng, Long-Bin; Lin, Yih-Jyh; Mok, King-Tong; Lee, Wei-Chen; Yeh, Hong-Zen; Ho, Ming-Chih; Yang, Sheng-Shun; Yang, Mei-Due; Yu, Ming-Chin; Hu, Rey-Heng; Peng, Cheng-Yuan; Lai, Kuan-Lang; Chang, Stanley Shi-Chung; Chen, Pei-Jer

    2014-01-01

    AIM: To demonstrate that administering heparanase inhibitor PI-88 at 160 mg/d is safe and promising in reducing hepatocellular carcinoma (HCC) recurrence for up to 3 year following curative resection. METHODS: A total of 143 patients (83.1% of the 172 participants in the phase II study) participated in the follow-up study. Of these patients, 50 had received no treatment, 48 had received 160 mg/d PI-88, and 45 had received 250 mg/d PI-88 during the phase II trial. Safety parameters and the following efficacy endpoints were investigated: (1) time to recurrence; (2) disease-free survival; and (3) overall survival. RESULTS: PI-88 at 160 mg/d delayed the onset and frequency of HCC recurrence, and provided a clinically significant survival advantage for up to 3 years after treatment compared with those of the control group: (1) the recurrence-free rate increased from 50% to 63%, and (2) time to recurrence at the 36th percentile was postponed by 78%. The efficacy of administering PI-88 at 250 mg/d was confounded by a high dropout rate (11 out of 54 patients). Additionally, subgroup analyses of patients with (1) multiple tumors or a single tumor ? 2 cm; and (2) hepatitis B or C revealed that administering PI-88 at 160 mg/d conferred the most significant survival advantage (56.8% improvement in disease-free survival, P = 0.045) for patients with both risk factors for recurrence. CONCLUSION: Administering PI-88 at 160 mg/d is a safe and well-tolerated dosage that may confer significant clinical benefits for patients with HCC. PMID:25170226

  4. Behaviour of zirconium, niobium, yttrium and the rare earth elements in the Thor Lake rare-metal

    E-print Network

    Behaviour of zirconium, niobium, yttrium and the rare earth elements in the Thor Lake rare-metal © Emma Rebecca Sheard, 2010 #12;i ABSTRACT The Thor Lake rare-metal (Zr, Nb, Y, REE, Ta, Be, Ga) deposit and the heavy rare earth elements in the world. Much of the potentially economic mineralization was concentrated

  5. Tm sup +3 decay in chromium-thulium-holmium-doped yttrium aluminum garnet at liquid helium temperatures

    SciTech Connect

    Rotman, S.R. (Ben-Gurion University of the Negev, Department of Electrical and Computer Engineering, P.O. Box 653, 84105 Beer-Sheva (Israel)); Kalisky, Y. (Laser Department, Nuclear Research Centre-Negev, P.O. Box 9001, 84190 Beer-Sheva (Israel)); Brenier, A.; Pedrini, C.; Boulon, G. (Laboratoire de Physico-Chimie des Materiaux Luminescents, Universite Lyon I-Unite Associee au CNRS-Bat. 205, 69622, Villeurbanne (France)); Hartmann, F.X. (Department of Chemistry, Brookhaven National Laboratory, Upton, New York 11973 (United States))

    1992-07-01

    The standard expression for the excited-state acceptor concentration in codoped solid-state materials is modified to include the possibility of nonradiative acceptor deexcitation. The chromium and thulium time-dependent emission in yttrium aluminum garnet (YAG) is then studied; evidence is given for the identification of the tendency for localized correlated chromium-thulium pairs in the crystalline material.

  6. In-situ characterization of the oxide scale formed on yttrium-coated 304 stainless steel at 1000 deg. C

    SciTech Connect

    Riffard, F.; Buscail, H.; Caudron, E.; Cueff, R.; Issartel, C.; Perrier, S

    2002-08-15

    In-situ X-ray diffraction was combined with scanning electron microscopy (SEM) and energy dispersive X-ray (EDX) analyses to characterize the oxides formed on yttrium-coated 304 stainless steel during oxidation at 1000 deg. C in air. Results are compared with those obtained on uncoated specimens. Care has also been taken on the structural transformations during the cooling process. At 1000 deg. C, yttrium leads to the formation of YCrO{sub 3} and YCrO{sub 4} oxides. These oxides are mainly located at the external interface. Moreover, silicon segregation at the oxide-metal interface is also observed. The yttrium coating seems to promote a favorable effect on the continuity of the silicon-rich subscale limiting the oxide scale growth and the formation of iron oxides. Thermogravimetric studies reveal that yttrium addition leads to a lower weight gain which is related to a limitation of the initial transient oxidation stage and to a reduction of the parabolic rate constant.

  7. Comparison of cholestane and yttrium oxide as digestibility markers for lipid components in Atlantic salmon ( Salmo salar L.) diets

    Microsoft Academic Search

    C. G Carter; T. E Lewis; P. D Nichols

    2003-01-01

    The study aimed to test the similarity between apparent digestibility coefficients (ADC) calculated using either yttrium oxide or cholestane. Atlantic salmon were fed three diets containing a different mix of oil sources: diets contained only canola oil (CO), canola oil and fish oil (CFO), or canola oil and thraustochytrid meal (CTH) (a marine microorganism with potential as an alternative oil

  8. Identification of spin wave modes in yttrium iron garnet strongly coupled to a co-axial cavity.

    E-print Network

    Lambert, N. J.; Haigh, J. A.; Ferguson, A. J.

    2015-02-05

    with Magnons at Microwave Frequencies,” Physical Review Applied 2, 054002 (2014). 9J. R. Eshbach, “Spin-wave propogation and the magnetoelastic interaction in Yttrium Iron Garnet,” Physical Review Letters 8, 357–359 (1962). 10M. Tsoi, A. G. M. Jansen, J. Bass...

  9. Rare-earth elements and yttrium distributions in mangrove coastal water systems: The western Gulf of Thailand

    Microsoft Academic Search

    P. Censi; S. E. Spoto; G. Nardone; F. Saiano; R. Punturo; S. I. Di Geronimo; S. Mazzola; A. Bonanno; B. Patti; M. Sprovieri; D. Ottonello

    2005-01-01

    The concentration of rare-earth elements and yttrium (REY) was investigated in dissolved phase, suspended particulate matter, and seafloor sediments of the western coastal area of the Gulf of Thailand. The samples show Eu and Gd positive anomalies in the shale-normalized REY patterns, especially in the suspended particulate matter. On the other hand, a very high REE content was detected in

  10. In situ high-temperature X-ray diffraction characterization of yttrium-implanted extra low-carbon steel

    SciTech Connect

    Caudron, E.; Buscail, H.; Perrier, S.

    1999-11-01

    Yttrium-implanted and unimplanted extra low-carbon steel samples were analyzed at T = 700 C and under an oxygen partial pressure P{sub O2} = 0.041Pa for 24 h to show the yttrium implantation effect on extra low-carbon steel high-temperature corrosion resistance. Sample oxidation weight gains were studied by thermogravimetry, and structural analyses were performed using in situ high-temperature X-ray diffraction with the same experimental conditions. The aim of this paper is to show the initial nucleation stage of the main compounds induced by oxidation at high temperatures according to the initial sample treatment (yttrium-implanted or unimplanted). The results obtained by in situ high-temperature X-ray diffraction will be compared to those by thermogravimetry to show the existing correlation between weight gain curves and structural studies. Results allow one to understand the improved corrosion resistance of yttrium-implanted extra low-carbon steel at high temperatures.

  11. The effect of chromium, carbon, and yttrium on the oxidation of nickel-base alloys in high temperature water

    Microsoft Academic Search

    T. M. Angeliu

    1993-01-01

    Since the surface film has been implicated in several models of intergranular stress corrosion cracking (IGSCC) of nickel-base alloys, this study was initiated to provide a foundation for the future study of a possible link between the nature of the surface film and IG crack susceptibility. The influence of chromium, carbon, and yttrium on the nature of the surface film

  12. PRELIMINARY REPORT ON THE SITE OF LOCALIZATION AND POSSIBLE BINDING AGENT FOR YTTRIUM, AMERICIUM AND PLUTONIUM IN CORTICAL BONE

    Microsoft Academic Search

    G. M. Herring; Janet Vaughan; Margaret Williamson

    1962-01-01

    Characteristics of bone surfaces are discussed in relation to the uptake ; of bone-seeking isotopes. The alkaline earths are concentrated behind the ; osteoid border of active surfaces. Yttrium, americium, and plutonium are ; concentrated on quiescent and resorbing surfaces; traces only occur in and ; beneath the osteoid border. In view of evidence of mucoproteins at sites where ;

  13. Q factor of dual-tunable microwave resonators based on yttrium iron garnet and barium strontium titanate layered structures

    E-print Network

    Srinivasan, Gopalan

    Q factor of dual-tunable microwave resonators based on yttrium iron garnet and barium strontium of dual-tunable ferrite-ferroelectric hybrid wave microwave resonator was studied as a function of bias 500 m plate of ceramic barium strontium titanate having similar in-plane sizes. A frequency spectrum

  14. Liquid-Liquid Extraction Studies of Trivalent Yttrium from Phosphoric Acid Solutions Using TOPS 99 as an Extractant

    Microsoft Academic Search

    B. Ramachandra Reddy; S. Radhika; B. Nagaphani Kumar

    2010-01-01

    Liquid-liquid extraction studies of trivalent yttrium (Y) from phosphoric acid solutions have been carried out with commercial organophosphoric acid based extractant TOPS 99 (Talcher Organo phosphorus solvent, an equivalent of di-2-ethylhexyl phosphoric acid). The parameters studied include equilibration time, acid concentration, extractant concentration, diluent, metal concentration, temperature, stripping, and regeneration of the extractant. Increase of phosphoric acid concentration in the

  15. Novel myeloid differentiation factor 88, EsMyD88, exhibits EsTube-binding activity in Chinese mitten crab Eriocheir sinensis.

    PubMed

    Huang, Ying; Chen, Yi-Hong; Wang, Zheng; Wang, Wen; Ren, Qian

    2014-12-01

    Myeloid differentiation factor 88 (MyD88) is a universal and essential adapter protein that participates in the activation of the Toll-like receptor/interleukin-1 receptor-mediated signaling pathway. In the present study, a new MyD88 gene (named EsMyD88) was identified in the Chinese mitten crab Eriocheir sinensis. The cDNA of EsMyD88 was 2210?bp long with a 1416?bp open reading frame that encoded a protein with 472 amino acids. Predicted EsMyD88 protein had a death domain at the N-terminal and a TIR domain at the C-terminal. BLASTP and phylogenetic analysis results showed that EsMyD88 was clustered in one group together with other crustaceans MyD88 (SpMyD88, FcMyD88, LvMyD88, and LvMyD88-1). EsMyD88 was detected in all the examined tissues of healthy crabs, and was mainly expressed in the hemocytes and nerves. When normal crabs were challenged with lipopolysaccharide, peptidoglycan, Staphylococcus aureus, Vibrio parahaemolyticus, or Aeromonas hydrophila, the expression levels of EsMyD88 significantly increased either in the hepatopancreas or hemocytes. Results of the pull-down assay showed that EsMyD88 could bind to downstream cytosolic adaptor EsTube. Overexpression of EsMyD88 protein in Drosophila Schneider 2 cells led to the activation of antimicrobial peptide genes. RNA interference assay showed that EsMyD88 is involved in regulating the transcription of ALF1 and ALF2, Cru1 and Cru2, and Lys in crab challenged with V. parahaemolyticus. All the results mentioned earlier indicated that EsMyD88 gene has a key function in antibacterial innate immune defense. PMID:25150191

  16. Hep88 mAb-initiated paraptosis-like PCD pathway in hepatocellular carcinoma cell line through the binding of mortalin (HSPA9) and alpha-enolase

    PubMed Central

    2014-01-01

    Background Hepatocellular carcinoma (HCC) is the most prevalent hepatic cancer worldwide. Currently, a targeted therapy via monoclonal antibodies (mAbs) specific to tumor-associated antigen is undergoing continual development in HCC treatment. Methods In this regard, after establishing and consequently exploring Hep88 mAb’s tumoricidal effect on hepatocellular carcinoma cell line (HepG2 cell line), the Hep88 mAb’s specific antigens from both membrane and cytoplasmic fractions of HepG2 cell line were identified by 2-D gel electrophoresis and western blot analysis. After in-gel digestion and subsequent analysis by liquid chromatography-mass spectrometry (LC-MS), mortalin (HSPA9) and alpha-enolase were identified. The recombinant proteins specific to Hep88 mAb were cloned and expressed in E. coli BL21(DE3). Moreover, alteration of HepG2 and Chang liver cell line after being induced by Hep88 mAb for 1–3 days was investigated using a transmission electron microscope. Results The result demonstrated that Hep88 mAb can bind to the recombinant mortalin (HSPA9) and alpha-enolase. In addition, the gradual appearing of mitochondria vacuolization and endoplasmic reticulum dilatation were observed. Those characteristics might be explained by the paraptosis-like program cell death (PCD), which is induced by the binding of Hep88 mAb to mortalin (HSPA9). Mortalin depletion resulting from the formation of Hep88 mAb-mortalin (HSPA9) complex might initiate transcription-independence of p53-mediated apoptosis. Additionally, Hep88mAb-alpha-enolase complex might initiate HepG2 cells energy exhaustion by glycolysis pathway obstruction. Conclusion These fascinating results imply that Hep88 mAb might be a promising tool for the development of an effective treatment of HCC in the next decade. PMID:25788858

  17. Approximate change in water levels in wells in the Chicot and Evangeline aquifers 1977-88 and 1987-88, and measured compaction, 1973-88, in the Houston-Galveston region, Texas

    USGS Publications Warehouse

    Gabrysch, R.K.; Ranzau, C.E., Jr.; Coplin, L.S.

    1988-01-01

    This report consists of: (1) four maps that present data on water level changes during 1977-88 and 1987-88 in the Chicot and Evangeline aquifers in the Houston area of Texas, and (2) one set of graphs and one map that present data on the compaction of subsurface materials for 1973-88. (USGS)

  18. Processing and Characterization of Proton Conducting Yttrium Doped Barium Zirconate for Solid Oxide Fuel Cell Applications

    NASA Astrophysics Data System (ADS)

    Babilo, Peter

    To address the wide range of reported conductivities in literature and investigate the viability of yttrium-doped barium zirconate (BaZr 1-xYxO3-delta) as a membrane in electrochemical devices, the factors governing the protonic transport properties have been explored, with the aim of attaining reproducible proton conductivity in well-densified samples. It was found that a small initial particle size and high temperature sintering in the presence of excess barium were essential. By this procedure, BaZr0.8Y0.2O3 with 93-99% of theoretical density and high total (bulk plus grain boundary) conductivity could be reliably prepared. Samples sintered in the absence of excess barium displayed yttria precipitates and a bulk conductivity that was reduced by more than two orders of magnitude. Hydrogen transport across grain boundaries has been explored and the specific conductivity found to be two orders of magnitude lower than the bulk. Microstructural optimization of the total grain boundary conductivity included both decreasing total grain boundary density as well as improving intrinsic grain boundary properties. To investigate the influence of defect chemistry on stability, proton solubility, and proton mobility; samples with yttrium dopant concentration of 30 and 40 mol % were prepared in addition to the 20 Y mol %. Lattice parameters obtained suggests the solubility of yttrium in barium zirconate to be at least 40 mol %. Thermogravimetric analysis of the barium zirconate system showed excellent chemical stability under CO2 and protonic defects to be approaching theoretical hydrogen concentration for 20, 30, and 40 Y mol %. Significant hydroxyl-dopant associations were observed, especially at lower temperatures, which trap protons and impede transport. To simplify processing procedures, the influence of transitional metal oxides additives (especially zinc oxide) on the densification and electrical properties of doped barium zirconate have been examined. With the use of zinc oxide as a sintering aid, BaZr0.85Y0.15O3 was readily sintered to above 93% of theoretical density at 1300 °C. SEM investigations showed Zn accumulation in the intergranular regions. Electromotive force measurements of BaZr0.8Y0.2O3 showed the ionic transference number under fuel cell conditions to be at least 0.92 at 600 °C. Fuel cells based on BYZ20 were prepared and characterized.

  19. Comparative study of yttrium and rare-earth element behaviours in fluorine-rich hydrothermal fluids

    NASA Astrophysics Data System (ADS)

    Bau, Michael; Dulski, Peter

    1995-03-01

    The mineral ‘fluorite’ is utilized as a probe to investigate the behaviour of the pseudolanthanide yttrium with respect to the lanthanides (rare-earth elements, REE) in fluorine-rich hydrothermal solutions. Hydrothermal vein fluorites are characterized by the close association of Y and REE, but in contrast to igneous and clastic rocks they show variable and non-chondritic Y/Ho ratios of up to 200. This suggests that Y and Ho, although similar in charge and size, may be fractionated in fluorine-rich medium-temperature aqueous fluids. In such solutions Y acts as a pseudolanthanide heavier than Lu. Y/Ho ratios of hydrothermal siderites are slightly below those of chondrites, suggesting that in (bi)carbonate-rich siderite-precipitating solutions Y may act as a Sm-like light pseudolanthanide. This indicates that Y-Ho fractionation is not a source-related phenomenon but depends on fluid composition. Based on these results it is strongly recommended that discussions of normalized REE patterns in general should be extended to normalized Rare-Earth-and-Yttrium (REY) patterns (Y inserted between Dy and Ho), because the slightly variable behaviour of the pseudolanthanide yttrium with respect to the REE may provide additional geochemical information. Available thermodynamic data suggest a negative correlation between Y/Ho and La/Ho during migration of a fluorite-precipitating hydrothermal solution. Cogenetic fluorites, therefore, should display either similar Y/Ho and similar La/Ho ratios, or a negative correlation between these ratios. This criterion may help to choose samples suitable for Sm-Nd isotopic studies prior to isotope analysis. However, in cogenetic hydrothermal vein fluorites the range of Y/Ho ratios is often almost negligible compared to the range of La/Ho ratios. This may be explained by modification of REE distributions by post-precipitation processes involving (partial) loss of a separate LREE-enriched phase. The presence of variable amounts of such an accessory phase in most fluorite samples is revealed by experiments employing stepwise incomplete fluorite decomposition. Fluorites derived from and deposited near to igneous rocks apparently display chondritic Y/Ho ratios close to those of their igneous source-rocks. However, a positive YSN anomaly is likely to develop as the distance between sites of REY mobilization and deposition increases.

  20. Use of CAP88 at Department of Energy Sites

    SciTech Connect

    Snyder, Sandra F.; Vazquez, Gustavo; Hay, Tristan R.

    2013-08-16

    The U.S. Department of Energy is committed to protecting the public and environment against undue risk from radiation associated with radiological activities conducted under its control. Some U.S. Department of Energy Site activities result in emissions of radioactive materials to the air. CAP88 codes are used to model these emissions and the subsequent maximum estimated dose to a member of the public in the vicinity of the U.S. Department of Energy Site. This paper reviews the use of the CAP88 code at the variety of U.S. Department of Energy sites that use it for compliance reporting under 40 CFR Part 61, Subpart H.

  1. Overexpression of FOXO3, MYD88, and GAPDH Identified by Suppression Subtractive Hybridization in Esophageal Cancer Is Associated with Autophagy

    PubMed Central

    Mottaghi-Dastjerdi, Negar; Setayesh, Neda; Roshandel, Gholamreza; Ebrahimifard, Farzaneh; Sepehrizadeh, Zargham

    2014-01-01

    To find genes involved in tumorigenesis and the development of esophageal cancer, the suppression subtractive hybridization (SSH) method was used to identify genes that are overexpressed in esophageal cancer tissues compared to normal esophageal tissues. In our SSH library, the forkhead box O3 (FOXO3), glyceraldehyde-3-phosphate dehydrogenase (GAPDH), and myeloid differentiation primary response 88 (MYD88) genes were the most highly upregulated genes, and they were selected for further studies because of their potential role in the induction of autophagy. Upregulation of these genes was also observed in clinical samples using qRT-PCR. In addition, coexpression analysis of the autophagy-related genes Beclin1, ATG12, Gabarapl, PIK3C3, and LC3 demonstrated a significant correlation between the differentially overexpressed genes and autophagy. Autophagy is an important mechanism in tumorigenesis and the development of chemoresistance in cancer cells. The upregulation of FOXO3, GAPDH, and MYD88 variants in esophageal cancer suggests a role for autophagy and provides new insight into the biology of esophageal cancer. We propose that FOXO3, GAPDH, and MYD88 are novel targets for combating autophagy in esophageal cancer. PMID:24527027

  2. Mycobacterium indicus pranii mediates macrophage activation through TLR2 and NOD2 in a MyD88 dependent manner.

    PubMed

    Pandey, Rajeev Kumar; Sodhi, Ajit; Biswas, Subhra K; Dahiya, Yogesh; Dhillon, Manprit K

    2012-08-24

    Mycobacterium indicus pranii (MIP) is a non-pathogenic strain of mycobacterium and has been used as a vaccine against tuberculosis and leprosy. Here, we investigated the role of different pattern recognition receptors in the recognition of heat-killed MIP by macrophages. Treatment of macrophages with MIP caused upregulation of pro-inflammatory cytokines (like TNF? and IL-1?) which was mediated through both TLR2 and NOD2, as revealed by our knockdown and/or knockout studies. Mechanistically, MIP-induced macrophage activation was shown to result in NF-?B activation and drastically abrogated by MyD88 deficiency, suggesting its regulation via an MyD88-dependent, NF-?B pathway. Interestingly, the IFN-inducible cytokine, CXCL10, which is known target of the TRIF-dependent TLR pathway was found to be upregulated in response to MIP but, in an MyD88-dependent manner. Collectively, these results demonstrate macrophages to recognize and respond to MIP through a TLR2, NOD2 and an MyD88-dependent pathway. However, further studies should clarify whether additional TLR-dependent or -independent pathways also exist in regulating the full spectrum of MIP action on macrophage activation. PMID:22796586

  3. Myeloid Differentiation Factor 88–Dependent Signaling Is Critical for Acute Organic Dust–Induced Airway Inflammation in Mice

    PubMed Central

    Bauer, Christopher; Kielian, Tammy; Wyatt, Todd A.; Romberger, Debra J.; West, William W.; Gleason, Angela M.

    2013-01-01

    Organic dust exposure within agricultural environments results in airway diseases. Toll-like receptor 2 (TLR2) and TLR4 only partly account for the innate response to these complex dust exposures. To determine the central pathway in mediating complex organic dust–induced airway inflammation, this study targeted the common adaptor protein, myeloid differentiation factor 88 (MyD88), and investigated the relative contributions of receptors upstream from this adaptor. Wild-type, MyD88, TLR9, TLR4, IL-1 receptor I (RI), and IL-18R knockout (KO) mice were challenged intranasally with organic dust extract (ODE) or saline, according to an established protocol. Airway hyperresponsiveness (AHR) was assessed by invasive pulmonary measurements. Bronchoalveolar lavage fluid was collected to quantitate leukocyte influx and cytokine/chemokine (TNF-?, IL-6, chemokine [C-X-C motif] ligands [CXCL1 and CXCL2]) concentrations. Lung tissue was collected for histopathology. Lung cell apoptosis was determined by a terminal deoxynucleotidyl transferase dUTP nick-end labeling assay, and lymphocyte influx and intercellular adhesion molecule–1 (ICAM-1) expression were assessed by immunohistochemistry. ODE-induced AHR was significantly attenuated in MyD88 KO mice, and neutrophil influx and cytokine/chemokine production were nearly absent in MyD88 KO animals after ODE challenges. Despite a near-absent airspace inflammatory response, lung parenchymal inflammation was increased in MyD88 KO mice after repeated ODE exposures. ODE-induced epithelial-cell ICAM-1 expression was diminished in MyD88 KO mice. No difference was evident in the small degree of ODE-induced lung-cell apoptosis. Mice deficient in TLR9, TLR4, and IL-18R, but not IL-1IR, demonstrated partial protection against ODE-induced neutrophil influx and cytokine/chemokine production. Collectively, the acute organic dust–induced airway inflammatory response is highly dependent on MyD88 signaling, and is dictated, in part, by important contributions from upstream TLRs and IL-18R. PMID:23492189

  4. Fluorescence enhancement of yttrium(III)-rutin by nucleic acids in the presence of cetyltrimethylammonium bromide

    NASA Astrophysics Data System (ADS)

    Wu, Xia; Guo, Changying; Wang, Fei; Yang, Jinghe; Ran, Dehuan; Zheng, Jinhua; Wu, Jinbo

    2006-11-01

    It is found that nucleic acids can enhance the fluorescence intensity of yttrium(III) (Y 3+)-rutin in presence of cetyltrimethylammonium bromide (CTMAB) system. In hexamethylenetetramine (HMTA)-HCl buffer, the maximum enhanced fluorescence is produced, with maximum excitation and emission wavelengths at 452 and 520 nm, respectively. Based on this, a new fluorimetric method of determination of nucleic acids is proposed. Under optimum conditions, the enhanced fluorescence intensity is proportion to the concentration of nucleic acids in the range of 1.0 × 10 -7 to 1.0 × 10 -5 g/ml for fish sperm DNA (fsDNA), 1.0 × 10 -7 to 4.6 × 10 -6 g/ml for yeast RNA (yRNA), their detection limits (S/N = 3) are 7.5 × 10 -8, 8.0 × 10 -8 g/ml, respectively. The interaction mechanism is also studied.

  5. Defective interfaces in yttrium-doped barium zirconate films and consequences on proton conduction.

    PubMed

    Yang, Nan; Cantoni, Claudia; Foglietti, Vittorio; Tebano, Antonello; Belianinov, Alex; Strelcov, Evgheni; Jesse, Stephen; Di Castro, Daniele; Di Bartolomeo, Elisabetta; Licoccia, Silvia; Kalinin, Sergei V; Balestrino, Giuseppe; Aruta, Carmela

    2015-04-01

    Yttrium-doped barium zirconate (BZY) thin films recently showed surprising electric transport properties. Experimental investigations conducted mainly by electrochemical impedance spectroscopy suggested that a consistent part of this BZY conductivity is of protonic nature. These results have stimulated further investigations by local unconventional techniques. Here, we use electrochemical strain microscopy (ESM) to detect electrochemical activity in BZY films with nanoscale resolution. ESM in a novel cross-sectional measuring setup allows the direct visualization of the interfacial activity. The local electrochemical investigation is compared with the structural studies performed by state of art scanning transmission electron microscopy (STEM). The ESM and STEM results show a clear correlation between the conductivity and the interface structural defects. We propose a physical model based on a misfit dislocation network that introduces a novel 2D transport phenomenon, whose fingerprint is the low activation energy measured. PMID:25789878

  6. Remarkable enhancement of O? activation on yttrium-stabilized zirconia surface in a dual catalyst bed.

    PubMed

    Richard, Mélissandre; Can, Fabien; Duprez, Daniel; Gil, Sonia; Giroir-Fendler, Anne; Bion, Nicolas

    2014-10-13

    Yttrium-stabilized zirconia (YSZ) has been extensively studied as an electrolyte material for solid oxide fuel cells (SOFC) but its performance in heterogeneous catalysis is also the object of a growing number of publications. In both applications, oxygen activation on the YSZ surface remains the step that hinders utilization at moderate temperature. It was demonstrated by oxygen isotope exchange that a dual catalyst bed system consisting of two successive LaMnO3 and YSZ beds without intimate contact drastically enhances oxygen activation on the YSZ surface at 698?K. It can be concluded that LaMnO3 activates the triplet ground-state of molecular oxygen into a low-lying singlet state, thereby facilitating the activation of the O2 molecule on the YSZ oxygen vacancy sites. This phenomenon is shown to improve the catalytic activity of the LaMnO3-Pd/YSZ system for the partial oxidation of methane. PMID:25169625

  7. The contact neodymium-yttrium aluminum garnet laser. A new approach to arthroscopic laser surgery.

    PubMed

    O'Brien, S J; Miller, D V

    1990-03-01

    Arthroscopic treatment of meniscal lesions has been modified as technological advances have occurred. However, alternatives to conventional arthroscopic cutting tools, including electrocautery and CO2 lasers, have thus far met with limited success. The recent development of a sapphire tip has enabled the use of the neodymium-yttrium aluminum garnet (Nd-YAG) laser in a contact mode in a saline medium. This study compares the biology of the Nd-YAG laser to that of electrocautery and scalpel techniques with respect to its effects on articular cartilage and the meniscus. The contact Nd-YAG laser has advantages over both scalpel and electrocautery with regard to its effects on articular cartilage. It also has significant biologic advantages over electrocautery for meniscal lesions. Although in its infancy in the clinical setting, the contact Nd-YAG laser represents the possible beginning of a new era for application of laser energy in arthroscopy. PMID:2302897

  8. Comment on "Thermal properties of magnons in yttrium iron garnet at elevated magnetic fields"

    NASA Astrophysics Data System (ADS)

    Boona, Stephen R.; Heremans, Joseph P.

    2015-06-01

    Rezende and López Ortiz [Phys. Rev. B 91, 104416 (2015), 10.1103/PhysRevB.91.104416] published a calculation for the magnon specific heat and thermal conductivity of yttrium iron garnet in the presence of large magnetic fields. The results reproduced our previous temperature-dependent measurements of both quantities in fields up to 70 kOe [Phys. Rev. B 90, 064421 (2014), 10.1103/PhysRevB.90.064421]. Here, we point out that the experimentally observed magnetic-field dependence of thermal conductivity shows a faster saturation than their model explains. Furthermore, their results do not affect the main conclusion of our paper regarding the magnon thermal mean-free path.

  9. Separation of yttrium from heavy lanthanide by CA-100 using the complexing agent.

    PubMed

    Wang, Y G; Xiong, Y; Meng, S L; Li, D Q

    2004-05-28

    The selective extraction of yttrium from heavy lanthanide by liquid-liquid extraction using CA-100 in the presence of the complexing agent, such as EDTA, DTPA, and HEDTA was investigated. The extraction of heavy lanthanide in the present of the complexing agent was suppressed when compared to that of Y because of the masking effect, but the selective extraction of Y was enhanced. All complexing agents formed 1:1 complex with rare earth elements (RE), and only free rare earth ions could take part in the extraction. The condition for separation was obtained by exploring the effects of the complexing agent concentration, the extractant concentration, pH and the equilibration time on the extraction of the heavy rare earth elements. PMID:18969423

  10. Observation of spin-wave dark soliton pairs in yttrium iron garnet thin films

    NASA Astrophysics Data System (ADS)

    Wang, Zihui; Cherkasskii, Mikhail; Kalinikos, Boris A.; Wu, Mingzhong

    2015-05-01

    The formation of a pair of dark solitons from a single nonlinear black spin-wave pulse was observed. The experiments were carried out with a long and narrow magnetic yttrium iron garnet film strip in a surface spin-wave configuration. The black spin-wave pulses were excited by the use of microwave black pulses—large-amplitude microwaves with narrow squarelike dips. Pairs of black solitons were observed in certain input power and input black pulse width ranges. For each pair, the two solitons show opposite ? phase jumps and an overall phase change of zero. Beyond those power and width ranges, one also observed pairs of gray solitons that showed opposite phase jumps and a zero total phase change. The formation of a single black soliton was also observed, but only for an input black pulse that was very narrow. The experimental observations were reproduced by numerical simulations based on the complex Ginzburg-Landau equation.

  11. Mixed conducting yttrium-barium-cobalt-oxide for high oxygen permeation

    Microsoft Academic Search

    H. W. Brinkman; H. Kruidhof; A. J. Burggraaf

    1994-01-01

    Yttrium-barium-cobalt-oxide (YBC), especially with low Y content, has been prepared. Oxygen permeation in these materials is very high at moderate temperature. The materials Y0.05BaCo0.95O3-? and Y0.10Ba0.90CoO3-? consisted of a BaCoO3-? like main phase and some minor phases. For the Y0.05BaCo0.95O3-? material these minor phases were not exceeding 10 vol%. Y0.05BaCo0.95O3-? had the highest oxygen permeation value of 3.9 × 10-7

  12. Significant improvement in electronic properties of transparent amorphous indium zinc oxide through yttrium doping

    NASA Astrophysics Data System (ADS)

    Sun, Jian; Yu, Zhigen; Huang, Yanhua; Xia, Yijie; Lai, Weng Soon; Gong, Hao

    2014-04-01

    One big challenge in transparent conducting oxides (TCOs) is to achieve high conductivity and mobility at a low processing temperature. Although optimized conductivity has been achieved in indium zinc oxide (IZO) without doping, it is still interesting to find whether doping can improve conductivity of IZO further. In this paper, we report a low processing temperature achievement of high conductivity and mobility of IZO through yttrium (Y) doping. We found that with different Y doping levels, room temperature fabricated amorphous IZO (a-IZO) samples can be controlled to exhibit either metallic or semiconductor characteristics. Y2O3 is demonstrated to be an effective doping source to achieve conductivity 300% higher than the non-doped IZO sample. Anomalously improved mobility of certain Y2O3-doped IZO samples compared with the non-doped IZO sample is found and analyzed. Besides, a low-temperature resistivity anomaly (semiconductor metal transition) phenomenon is observed and discussed.

  13. Yttrium silicate oxidation protective coating for SiC coated carbon\\/carbon composites

    Microsoft Academic Search

    Jian-Feng Huang; He-Jun Li; Xie-Rong Zeng; Ke-Zhi Li

    2006-01-01

    Four kinds of yttrium silicate oxidation protective coatings SiO2·Y2O3, 1.5SiO2·Y2O3, 1.5SiO2·Y2O3\\/SiO2·Y2O3 and 2SiO2·Y2O3\\/1.5SiO2·Y2O3\\/SiO2·Y2O3 were prepared by plasma spray on the surface of SiC pre-coated carbon\\/carbon composites. The structures of the coatings were characterized by XRD, SEM and EDS analyses. It was shown that the gradied 2SiO2·Y2O3\\/1.5SiO2·Y2O3\\/SiO2·Y2O3 multi-layer coating had better high-temperature oxidation resistance. It could protect carbon\\/carbon composites from oxidation

  14. Chemical solution deposition of ferroelectric yttrium-doped hafnium oxide films on platinum electrodes

    NASA Astrophysics Data System (ADS)

    Starschich, S.; Griesche, D.; Schneller, T.; Waser, R.; Böttger, U.

    2014-05-01

    Ferroelectric hafnium oxide films were fabricated by chemical solution deposition with a remnant polarization of >13 ?C/cm2. The samples were prepared with 5.2 mol. % yttrium-doping and the thickness varied from 18 nm to 70 nm. The hafnium oxide layer was integrated into a metal-insulator-metal capacitor using platinum electrodes. Due to the processing procedure, no thickness dependence of the ferroelectric properties was observed. To confirm the ferroelectric nature of the deposited samples, polarization, capacitance, and piezoelectric displacement measurements were performed. However, no evidence of the orthorhombic phase was found which has been proposed to be the non-centrosymmetric, ferroelectric phase in HfO2.

  15. Structure and luminescence spectra of lutetium and yttrium borates synthesized from ammonium nitrate melt

    NASA Astrophysics Data System (ADS)

    Klassen, Nikolay V.; Shmurak, Semion Z.; Shmyt'ko, Ivan M.; Strukova, Galina K.; Derenzo, Stephen E.; Weber, Marvin J.

    2005-01-01

    Lutetium and yttrium borates doped with europium, terbium, gadolinium, etc. have been synthesized by dissolving initial oxides and nitrates in ammonium nitrate melt and thermal decomposition of the solvent. Annealings in the range of 500-1100°C modified the dimensions of the grains from 2 to 3 nm to more than 100 nm. Significant dependence of the structure of lutetium borate on slight doping with rare earth ions has been found: terbium makes high-temperature vaterite phase preferential at room temperature, whereas europium stabilizes low-temperature calcite phase. Influence of the structure of the borates on the pattern of the luminescence spectra of europium dopant was observed. Possibilities for manufacturing of scintillating lutetium borate ceramics by means of this method of synthesis are discussed.

  16. Spin valve effect of the interfacial spin accumulation in yttrium iron garnet/platinum bilayers

    NASA Astrophysics Data System (ADS)

    Jin, Lichuan; Zhang, Dainan; Zhang, Huaiwu; Tang, Xiaoli; Bai, Feiming; Zhong, Zhiyong; Fan, Xin; Xiao, John Q.

    2014-09-01

    We report the spin valve effect in yttrium iron garnet/platinum (YIG/Pt) bilayers. The spin Hall effect (SHE) generates spin accumulation at the YIG/Pt interface and can be opened/closed by magnetization switching in the electrical insulator YIG. The interfacial spin accumulation was measured in both YIG/Pt and YIG/Cu/Pt structures using a planar Hall configuration. The spin valve effect remained, even after a 2 nm thick Cu layer was inserted between the YIG and Pt layers, which aimed to exclude the induced magnetization at the YIG/Pt interface. The transverse Hall voltage and switching field were dependent on the applied charge current density. The origin of this behavior can be explained by the SHE induced torque exerted on the domain wall, caused by the transfer of the spin angular momentum from the spin-polarized current to the YIG magnetic moment.

  17. High-power 266 nm ultraviolet generation in yttrium aluminum borate.

    PubMed

    Liu, Qiang; Yan, Xingpeng; Gong, Mali; Liu, Hua; Zhang, Ge; Ye, Ning

    2011-07-15

    A yttrium aluminum borate [YAl(3)(BO(3))(4)] (YAB) crystal with UV cutoff wavelength of 165 nm is used as the nonlinear optical crystal for fourth harmonic generation. The fundamental frequency laser at 1064 nm from an Nd:YVO(4) master oscillator power amplifier laser was frequency doubled to 532 nm. Using the type I phase-matching YAB crystal, a 5.05 W average power 266 nm UV laser was obtained at the pulse repetition frequency of 65 kHz, corresponding to the conversion efficiency of 12.3% from 532 to 266 nm. The experimental results show great potential for the application of using YAB as a nonlinear optical crystal to get high-power fourth harmonic generation. PMID:21765498

  18. High-power 266?nm ultraviolet generation in yttrium aluminum borate

    NASA Astrophysics Data System (ADS)

    Liu, Qiang; Yan, Xingpeng; Gong, Mali; Liu, Hua; Zhang, Ge; Ye, Ning

    2011-07-01

    A yttrium aluminum borate [YAl3(BO3)4] (YAB) crystal with UV cutoff wavelength of 165nm is used as the nonlinear optical crystal for fourth harmonic generation. The fundamental frequency laser at 1064nm from an Nd:YVO4 master oscillator power amplifier laser was frequency doubled to 532nm. Using the type I phase-matching YAB crystal, a 5.05W average power 266nm UV laser was obtained at the pulse repetition frequency of 65kHz, corresponding to the conversion efficiency of 12.3% from 532 to 266nm. The experimental results show great potential for the application of using YAB as a nonlinear optical crystal to get high-power fourth harmonic generation.

  19. Dynamics of hydrogen, oxygen, and dislocations in yttrium by acoustic spectroscopy

    SciTech Connect

    Cannelli, G. [Dipartimento di Fisica, Universita della Calabria, Arcavacata di Rende (Czechoslovakia) I-87036 (Italy)] [Dipartimento di Fisica, Universita della Calabria, Arcavacata di Rende (Czechoslovakia) I-87036 (Italy); Cantelli, R. [Dipartimento di Fisica, Universita di Roma La Sapienza, P.le A. Moro, Roma I-00185 (Italy)] [Dipartimento di Fisica, Universita di Roma La Sapienza, P.le A. Moro, Roma I-00185 (Italy); Cordero, F. [CNR, Istituto di Acustica O.M. Corbino, Via Cassia 1216, Roma I-00189 (Italy)] [CNR, Istituto di Acustica O.M. Corbino, Via Cassia 1216, Roma I-00189 (Italy); Trequattrini, F. [Dipartimento di Fisica, Universita di Roma La Sapienza, P.le A. Moro, Roma I-00189 (Italy)] [Dipartimento di Fisica, Universita di Roma La Sapienza, P.le A. Moro, Roma I-00189 (Italy)

    1997-06-01

    The nature of the numerous thermally activated processes occurring in yttrium has been investigated by acoustic spectroscopy in polycrystalline samples. The measurements have been carried out between 1.1 and 600 K in the kHz range, varying the concentration of interstitial hydrogen and oxygen in annealed and deformed samples. Four processes have been observed, besides the main dissipation peak around room temperature due to the formation or dissolution of H pairs and that at liquid He temperature attributed to H tunneling. The processes below 300 K have been interpreted in terms of the motion of interstitial hydrogen trapped by oxygen or dragged by dislocations, while the large relaxation detected around 450 K has been attributed to the hopping of oxygen in a solid solution. {copyright} {ital 1997} {ital The American Physical Society}

  20. Viscosity of suspensions of yttrium oxide (Y2O3) nanopowder in ethyl alcohol.

    PubMed

    Zy?a, Gawe?; Cholewa, Marian; Witek, Adam; Plog, Jan Philip; Lehmann, Volker; Oerther, Thomas; Gross, Dieter

    2012-12-01

    This paper presents results from measurements of viscosity of suspensions of Yttrium Oxide Y2O3 ceramic nanopowder in ethyl alcohol. The study was conducted at the request of and in cooperation with the ICMB. This research will add important information about the formation and viscosity characteristics of suspensions of nanopowders. The behavior of nanopowder suspensions has been examined in a wide range of shear rates from 0.01 s(-1) to 2000 s(-1). Additionally, the behavior of the suspension has been studied in the temperature range from -15 degrees C to 20 degrees C. Complementary experiments have been performed by application of a Rheo-NMR at Bruker Biospin and by the use of RheoScope at ThermoFisher companies. PMID:23447939

  1. Water absorption and interface reactivity of yttrium oxide gate dielectrics on silicon

    NASA Astrophysics Data System (ADS)

    Niu, D.; Ashcraft, R. W.; Parsons, G. N.

    2002-05-01

    High dielectric constant insulators deposited at low temperatures rapidly absorb water during exposure to the atmosphere, and the resulting OH leads to detrimental interface reactions. We report the effect of atmospheric exposure on ultrathin yttrium oxide, and details of silicon substrate reactions during postdeposition anneals. Infrared absorption analysis indicates significant absorption of water vapor during atmospheric exposure, even for very short times (<15 min). X-ray photoelectron spectroscopy demonstrates that after OH absorption, a thermally activated interface reaction proceeds with an activation energy of 0.33 eV, consistent with substrate reaction with OH present in the film. The OH absorption rate is reduced for annealed films or when capping layers are deposited in situ. Similar oxidation processes are expected to occur in other high-k materials of interest, where the rate of OH absorption will depend on the deposition process and material thermal history.

  2. The influence of gadolinium and yttrium on biomass production and nutrient balance of maize plants.

    PubMed

    Saatz, Jessica; Vetterlein, Doris; Mattusch, Jürgen; Otto, Matthias; Daus, Birgit

    2015-09-01

    Rare earth elements (REE) are expected to become pollutants by enriching in the environment due to their wide applications nowadays. The uptake and distribution of gadolinium and yttrium and its influence on biomass production and nutrient balance was investigated in hydroponic solution experiments with maize plants using increasing application doses of 0.1, 1 and 10 mg L(-1). It could be shown that concentrations of up to 1 mg L(-1) of Gd and Y did not reduce or enhance the plant growth or alter the nutrient balance. 10 mg L(-1) Gd or Y resulted in REE concentrations of up to 1.2 weight-% in the roots and severe phosphate deficiency symptoms. Transfer rates showed that there was only little transport of Gd and Y from roots to shoots. Significant correlations were found between the concentration of Gd and Y in the nutrient solution and the root tissue concentration of Ca, Mg and P. PMID:25898235

  3. Synthesis of dense yttrium-stabilised hafnia pellets for nuclear applications by spark plasma sintering

    NASA Astrophysics Data System (ADS)

    Tyrpekl, Vaclav; Holzhäuser, Michael; Hein, Herwin; Vigier, Jean-Francois; Somers, Joseph; Svora, Petr

    2014-11-01

    Dense yttrium-stabilised hafnia pellets (91.35 wt.% HfO2 and 8.65 wt.% Y2O3) were prepared by spark plasma sintering consolidation of micro-beads synthesised by the “external gelation” sol-gel technique. This technique allows a preparation of HfO2-Y2O3 beads with homogenous yttria-hafnia solid solution. A sintering time of 5 min at 1600 °C was sufficient to produce high density pellets (over 90% of the theoretical density) with significant reproducibility. The pellets have been machined in a lathe to the correct dimensions for use as neutron absorbers in an experimental test irradiation in the High Flux Reactor (HFR) in Petten, Holland, in order to investigate the safety of americium based nuclear fuels.

  4. Growth and characterization of a novel nonlinear optical borate crystal--yttrium calcium borate (YCB).

    PubMed

    Arun Kumar, R; Arivanandhan, M; Dhanasekaran, R; Hayakawa, Y

    2013-06-01

    A new nonlinear optical single crystal yttrium calcium borate Y2CaB10O19 (YCB) was grown for the first time from its melt. The starting materials were prepared by the solid-state reaction method. The melting point of the synthesized material was identified to be 967 °C. YCB crystal exhibits monoclinic crystal structure with the space group C2. The crystalline perfection of the grown YCB crystal was found to be good. From the UV-VIS-NIR studies, the lower cutoff wavelength of the crystal occurs below 200 nm. The functional groups of the grown crystal were assigned using the FTIR data. The second harmonic generation (SHG) of the YCB crystal was observed using a Nd:YAG laser with a fundamental wavelength of 1064 nm. The laser damage threshold value of the YCB crystal was found to be very high - 10.5 GW/cm(2). PMID:23583874

  5. Growth and characterization of a novel nonlinear optical borate crystal - Yttrium calcium borate (YCB)

    NASA Astrophysics Data System (ADS)

    Arun Kumar, R.; Arivanandhan, M.; Dhanasekaran, R.; Hayakawa, Y.

    2013-06-01

    A new nonlinear optical single crystal yttrium calcium borate Y2CaB10O19 (YCB) was grown for the first time from its melt. The starting materials were prepared by the solid-state reaction method. The melting point of the synthesized material was identified to be 967 °C. YCB crystal exhibits monoclinic crystal structure with the space group C2. The crystalline perfection of the grown YCB crystal was found to be good. From the UV-VIS-NIR studies, the lower cutoff wavelength of the crystal occurs below 200 nm. The functional groups of the grown crystal were assigned using the FTIR data. The second harmonic generation (SHG) of the YCB crystal was observed using a Nd:YAG laser with a fundamental wavelength of 1064 nm. The laser damage threshold value of the YCB crystal was found to be very high - 10.5 GW/cm2.

  6. Synthesis and characterization of cerium and yttrium alkoxide complexes supported by ferrocene-based chelating ligands.

    PubMed

    Broderick, Erin M; Thuy-Boun, Peter S; Guo, Neng; Vogel, Carola S; Sutter, Jörg; Miller, Jeffrey T; Meyer, Karsten; Diaconescu, Paula L

    2011-04-01

    Two series of Schiff base metal complexes were investigated, where each series was supported by an ancillary ligand incorporating a ferrocene backbone and different N=X functionalities. One ligand is based on an imine, while the other is based on an iminophosphorane group. Cerium(IV), cerium(III), and yttrium(III) alkoxide complexes supported by the two ligands were synthesized. All metal complexes were characterized by cyclic voltammetry. Additionally, NMR, Mo?ssbauer, X-ray absorption near-edge structure (XANES), and absorption spectroscopies were used. The experimental data indicate that iron remains in the +2 oxidation state and that cerium(IV) does not engage in a redox behavior with the ancillary ligand. PMID:21366251

  7. Integration of nonlinear dielectric barium strontium titanate with polycrystalline yttrium iron garnet

    SciTech Connect

    Jia, Q.X.; Groves, J.R.; Arendt, P.; Fan, Y.; Findikoglu, A.T.; Foltyn, S.R. [Superconductivity Technology Center, Mail Stop K763, Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (United States)] [Superconductivity Technology Center, Mail Stop K763, Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (United States); Jiang, H. [NZ Applied Technologies, 150-C New Boston Street, Woburn, Massachusetts 01801 (United States)] [NZ Applied Technologies, 150-C New Boston Street, Woburn, Massachusetts 01801 (United States); Miranda, F.A. [NASA Lewis Research Center, 21000 Brookpark Road, MS 54-5, Cleveland, Ohio 44135 (United States)] [NASA Lewis Research Center, 21000 Brookpark Road, MS 54-5, Cleveland, Ohio 44135 (United States)

    1999-03-01

    Biaxially oriented nonlinear dielectric Ba{sub 0.6}Sr{sub 0.4}TiO{sub 3} (BST) films have been grown on polycrystalline ferrite yttrium iron garnet (YIG) substrates. We use a structurally and chemically compatible MgO buffer to improve the crystallinity of the BST on polycrystalline YIG substrates, where the biaxially oriented MgO is deposited by an ion-beam assisted-deposition technique. The biaxially oriented BST has a dielectric loss of less than 0.01 and a capacitance tunability of greater than 25{percent} at a direct current bias voltage of 40 V at room temperature. {copyright} {ital 1999 American Institute of Physics.}

  8. Segregation of lutetium and yttrium to grain boundaries in iridium alloys

    SciTech Connect

    Gubbi, A.N.; George, E.P.; Ohriner, E.K. [Oak Ridge National Lab., TN (United States). Metals and Ceramics Div.] [Oak Ridge National Lab., TN (United States). Metals and Ceramics Div.; Zee, R.H. [Auburn Univ., AL (United States). Materials Engineering Program] [Auburn Univ., AL (United States). Materials Engineering Program

    1998-01-23

    The equilibrium segregation of lutetium and yttrium to grain boundaries in iridium alloys containing 0.3 wt% tungsten was studied. The segregation level of Lu decreased with increasing annealing temperature whereas that of Y initially increased with increasing temperature but then decreased with further increases in temperature. At all temperatures, Y segregated more strongly than lutetium. The observed segregation behavior of the two dopants was explained on the basis of their free energies of segregation and solid solubilities, and the solvus lines for Lu and Y were obtained from the results. Energies of segregation and energies of solution for Lu and Y in the iridium alloy were also determined. Iridium alloys containing nominally 0.3 wt% W, 60 wppm Th and 50 wppm Al are used to clad the plutonia fuel pellets used in radioisotope thermoelectric generators for space power applications.

  9. Cathodoluminescent properties of an Am3+ ion in a matrix of yttrium-aluminum garnet Y3Al5O12

    NASA Astrophysics Data System (ADS)

    Kuznetsova, Ya. V.; Usacheva, V. P.; Zamoryanskaya, M. V.

    2014-03-01

    The luminescent properties of an americium ion are studied. Luminescence spectra of americium in yttrium-aluminum garnet are recorded for the first time. The luminescence bands are identified, and the levels responsible for the observed optical transitions are determined.

  10. Crystal and molecular structure of monomeric yttrium(III) dipivalylmethanate. Arrangement of adsorbed layers

    SciTech Connect

    Gromilov, S.A.; Baidina, I.A.; Prokhorova, S.A. [and others

    1995-11-01

    Crystal structure of monomeric yttrium(III) dipivalylmethanate, YO{sub 6}C{sub 33}H{sub 57}, has been studied by X-ray diffraction. Crystal data: a = 17.868(3), b = 9.977(2), c = 10.633(2) {angstrom}, V = 1895.7 {angstrom}{sup 3}, space group Pmn2{sub 1}, Z = 2, d{sub calc} = 1.116, d{sub exp} = 1.119 g/cm{sup 3}. The compound has a molecular structure and consists of monomeric molecules with a proper symmetry plane m. In the metallocycle lying in this plane, Y-O interatomic distances and O-Y-O bond angles markedly differ from the similar distances and angles in the other two planes. The average Y-O, O-C, and C-C distances are 2.22, 1.25, and 1.46 {angstrom}, respectively. As a result of comparative crystal-chemical analysis carried out for related compounds, the coordination polyhedra around the yttrium atoms were found to be trigonal prisms formed by six oxygen atoms of three bidentate ligands. Layers {approximately}1 {mu}m thick were obtained by vapor condensation of the complex on different support; the layers were investigated by XRD. Irrespective of the type of support, the layers are oriented polycrystalline films with texture axes. Arrangement of the adsorbed molecules of the complex is analyzed. The layers are self-organized into close-packed structures with C(CH{sub 3}){sub 3} groups oriented toward supports.

  11. Shape phase transition at N =88 -90 in Ba,146144

    NASA Astrophysics Data System (ADS)

    Gupta, J. B.; Saxena, Mansi

    2015-05-01

    Background: The neutron-rich Ba isotopes with only six valence protons represent the beginning of the collective rotation-vibration band structure. The sharp shape phase transition at N = 88 -90 observed in Ce-Gd isotones is not exhibited in Ba-146144 , which renders their analysis interesting. Also there are ambiguities in the spin and band assignments. Purpose: To study their spectra empirically and to compare with predictions from an interacting boson model and microscopic dynamic pairing plus quadrupole model to explain the smooth shape transition at N = 88 -90 . Method: We compare the results of the calculation in the interacting boson models (IBM-1) and IBM-2 and the dynamic pairing plus quadrupole model with experiment and illustrate the variation in level structure of the Ba isotopes with N. The absence of sharp phase transition at N = 88 -90 is examined. Results: The ambiguous spin and parity of levels of the vibrational bands are assigned on the basis of calculated K components and the decay characteristics. Conclusion: The second I?= 2+ states in Ba,146144 have K = 0 predominance, and I?=23+ states are K = 2 . The smooth transition at N = 88 -90 is explained.

  12. 88. Photocopied August 1978 by the Harry S. Truman Library, ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    88. Photocopied August 1978 by the Harry S. Truman Library, Independence, Missouri, from the original belonging to the Watkins Mill Historic Site. HANDBILL WRITTEN BY WALTHUS L. WATKINS, ADVERTISING THE OPENING OF HIS MILL. DATED: MAY 8TH, 1861. - Watkins Mill, County Highway MM, Lawson, Ray County, MO

  13. CMU-ITC-88-070 Design and Specification

    E-print Network

    CMU-ITC-88-070 Design and Specification of the Cellular Andrew Environment Edward R. Zayas Craig F. Everhart Information Technology Center Carnegie Mellon University DRAFT 2 August 1988 [/afs/andrew.cmu. Cellular Andrew Extensions 3 2.1 Authentication 3 2.1.1 Standard Mechanisms 3 2.1.2 Extensions 4 2.2 Volume

  14. RAPID COMMUNICATIONS PHYSICAL REVIEW B 88, 201404(R) (2013)

    E-print Network

    2013-01-01

    apply the concept of quasicrystals to metamaterials and experimentally demonstrate metasurfaces metasurfaces we quantify the impact of symmetry on their properties. This is achieved by studying symmetry in k space, therefore opening a route towards isotropic metasurfaces. DOI: 10.1103/PhysRevB.88

  15. 88. EAST SECTION OF SOUTH PLANT FROM CHEMICAL STORAGE TANK, ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    88. EAST SECTION OF SOUTH PLANT FROM CHEMICAL STORAGE TANK, SHOWING MUSTARD FILLING BUILDING (BUILDING 728) AT RIGHT FOREGROUND AND ARMY RESERVE CENTER (BUILDING 732) AT CENTER. VIEW TO SOUTHEAST. - Rocky Mountain Arsenal, Bounded by Ninety-sixth Avenue & Fifty-sixth Avenue, Buckley Road, Quebec Street & Colorado Highway 2, Commerce City, Adams County, CO

  16. RAPID COMMUNICATIONS PHYSICAL REVIEW E 88, 040102(R) (2013)

    E-print Network

    McKane, Alan

    2013-01-01

    RAPID COMMUNICATIONS PHYSICAL REVIEW E 88, 040102(R) (2013) Intrinsic noise and discrete reactions, interact with each other and with cell products, and regulate the synthesis of other proteins dramatically impact the behavior of dynamical systems. This is a widespread observation and has many

  17. 40 CFR 8.8 - Comprehensive environmental evaluation.

    Code of Federal Regulations, 2013 CFR

    2013-07-01

    ...NONGOVERNMENTAL ACTIVITIES IN ANTARCTICA § 8.8 Comprehensive...who plans a nongovernmental expedition that would require a CEE...prior to departure of the expedition. If EPA does not provide...Protection, provided that no expedition need be delayed through...

  18. 40 CFR 8.8 - Comprehensive environmental evaluation.

    Code of Federal Regulations, 2012 CFR

    2012-07-01

    ...NONGOVERNMENTAL ACTIVITIES IN ANTARCTICA § 8.8 Comprehensive...who plans a nongovernmental expedition that would require a CEE...prior to departure of the expedition. If EPA does not provide...Protection, provided that no expedition need be delayed through...

  19. 40 CFR 8.8 - Comprehensive environmental evaluation.

    Code of Federal Regulations, 2011 CFR

    2011-07-01

    ...NONGOVERNMENTAL ACTIVITIES IN ANTARCTICA § 8.8 Comprehensive...who plans a nongovernmental expedition that would require a CEE...prior to departure of the expedition. If EPA does not provide...Protection, provided that no expedition need be delayed through...

  20. 40 CFR 8.8 - Comprehensive environmental evaluation.

    Code of Federal Regulations, 2010 CFR

    2010-07-01

    ...NONGOVERNMENTAL ACTIVITIES IN ANTARCTICA § 8.8 Comprehensive...who plans a nongovernmental expedition that would require a CEE...prior to departure of the expedition. If EPA does not provide...Protection, provided that no expedition need be delayed through...

  1. 40 CFR 8.8 - Comprehensive environmental evaluation.

    Code of Federal Regulations, 2014 CFR

    2014-07-01

    ...NONGOVERNMENTAL ACTIVITIES IN ANTARCTICA § 8.8 Comprehensive...who plans a nongovernmental expedition that would require a CEE...prior to departure of the expedition. If EPA does not provide...Protection, provided that no expedition need be delayed through...

  2. PHYSICAL REVIEW B 88, 024303 (2013) Tunable active acoustic metamaterials

    E-print Network

    Cummer, Steven A.

    2013-01-01

    PHYSICAL REVIEW B 88, 024303 (2013) Tunable active acoustic metamaterials Bogdan-Ioan Popa,* Lucian July 2013) We describe and demonstrate an architecture for active acoustic metamaterials whose types of unit cells that generate metamaterials in which either the effective density or bulk modulus

  3. 88. CEDAR DRAW SPILL, HIGH LINE CANAL, TWIN FALLS COUNTY, ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    88. CEDAR DRAW SPILL, HIGH LINE CANAL, TWIN FALLS COUNTY, SOUTH OF FILER, IDAHO; WEST VIEW OF CANAL AND GATES. - Milner Dam & Main Canal: Twin Falls Canal Company, On Snake River, 11 miles West of city of Burley, Idaho, Twin Falls, Twin Falls County, ID

  4. Oregon Office of Community College Services: Profile, 1987-88.

    ERIC Educational Resources Information Center

    Oregon State Dept. of Education, Salem. Office of Community Coll. Services.

    A profile is provided of the 16 Oregon community colleges and their services for the academic year 1987-88. First, a directory is presented of the address, phone number, and chief administrative officer of each college. The next section focuses on the colleges' students, providing numerous tables on full-time equivalent students (FTE) by program…

  5. RAPID COMMUNICATIONS PHYSICAL REVIEW B 88, 081204(R) (2013)

    E-print Network

    Baer, Roi

    2013-01-01

    RAPID COMMUNICATIONS PHYSICAL REVIEW B 88, 081204(R) (2013) Gap renormalization of molecular,4 Jeffrey B. Neaton,2 and Leeor Kronik1 1 Department of Materials and Interfaces, Weizmann Institute long-range correlation effects. In this Rapid Communication, we propose a new den- sity functional

  6. PLANKTON SAMPLERS SPECIAL SCIENTIFIC REPORT: FISHERIES No. 88

    E-print Network

    HIGH SPEED PLANKTON SAMPLERS SPECIAL SCIENTIFIC REPORT: FISHERIES No. 88 UNITED STATES DEPARTMENT Se^^rice, Albert M» Day, Director HIGH SPEED PLANKTON SAMPLERS 1» A High Speed Plankton Sampler-metal Plankton Sampler (Model Gulf III) by Jack Wo Gehringer Fishery Research Biologist Gulf Fishery

  7. Gateway Technical College 1987-88 Monitoring and Screening Study.

    ERIC Educational Resources Information Center

    Cloutier, Lucinda Robinson; Lipor, Lynn E.

    In 1987-88, Gateway Technical College (GTC) in Racine, Wisconsin developed a model for identifying programs as potential candidates for either an in-depth evaluation or program audit. In order to facilitate program comparisons, the model applies the same evaluation criteria to all programs. The criteria, which were selected to match the concerns…

  8. Vol. 88, No. 10, 1998 1087 Ecology and Population Biology

    E-print Network

    McDonald, Bruce

    bicolor (L.) Moench), mainly using viru- lence on differential sorghum cultivars as a marker. Several of a Colletotrichum graminicola Population in a Sorghum Disease Nursery U. L. Rosewich, R. E. Pettway, B. A. Mc in a sorghum disease nursery. Phytopathology 88:1087-1093. Restriction fragment length polymorphisms (RFLPs

  9. Differential outcome of infection with attenuated Salmonella in MyD88-deficient mice is dependent on the route of administration.

    PubMed

    Issac, Jincy M; Sarawathiamma, Dhanya; Al-Ketbi, Mai I; Azimullah, Sheikh; Al-Ojali, Samia M; Mohamed, Yassir A; Flavell, Richard A; Fernandez-Cabezudo, Maria J; al-Ramadi, Basel K

    2013-01-01

    Activation of the innate immune system is a prerequisite for the induction of adaptive immunity to both infectious and non-infectious agents. TLRs are key components of the innate immune recognition system and detect pathogen-associated molecular patterns. Most TLRs utilize the MyD88 adaptor for their signaling pathways. In the current study, we investigated innate and adaptive immune responses to primary as well as secondary Salmonella infections in MyD88-deficient (MyD88(-/-)) mice. Using i.p. or oral route of inoculation, we demonstrate that MyD88(-/-) mice are hypersusceptible to infection by an attenuated, double auxotrophic, mutant of Salmonella enterica serovar Typhimurium (S. typhimurium). This is manifested by 2-3 logs higher bacterial loads in target organs, delayed recruitment of phagocytic cells, and defective production of proinflammatory cytokines in MyD88(-/-) mice. Despite these deficiencies, MyD88(-/-) mice developed Salmonella-specific memory Th1 responses and produced elevated serum levels of anti-Salmonella Abs, not only of Th1-driven (IgG2c, IgG3) but also IgG1 and IgG2b isotypes. Curiously, these adaptive responses were insufficient to afford full protection against a secondary challenge with a virulent strain of S. typhimurium. In comparison with the high degree of mortality seen in MyD88(-/-) mice following i.p. inoculation, oral infections led to the establishment of a state of long-term persistence, characterized by continuous bacterial shedding in animal feces that lasted for more than 6 months, but absence from systemic organs. These findings suggest that the absent expression of MyD88 affects primarily the innate effector arm of the immune system and highlights its critical role in anti-bacterial defense. PMID:22386951

  10. The comparison of CAP88-PC version 2.0 versus CAP88-PC version 1.0

    SciTech Connect

    Yakubovich, B.A.; Klee, K.O.; Palmer, C.R.; Spotts, P.B.

    1997-12-01

    40 CFR Part 61 (Subpart H of the NESHAP) requires DOE facilities to use approved sampling procedures, computer models, or other approved procedures when calculating Effective Dose Equivalent (EDE) values to members of the public. Currently version 1.0 of the approved computer model CAP88-PC is used to calculate EDE values. The DOE has upgraded the CAP88-PC software to version 2.0. This version provides simplified data entry, better printing characteristics, the use of a mouse, and other features. The DOE has developed and released version 2.0 for testing and comment. This new software is a WINDOWS based application that offers a new graphical user interface with new utilities for preparing and managing population and weather data, and several new decay chains. The program also allows the user to view results before printing. This document describes a test that confirmed CAP88-PC version 2.0 generates results comparable to the original version of the CAP88-PC program.

  11. Targeted ?-Therapy

    PubMed Central

    Brechbiel, Martin W.

    2008-01-01

    Monoclonal antibodies have become a viable strategy for the delivery of therapeutic, particle emitting radionuclides specifically to tumor cells to either augment anti-tumor action of the native antibodies or to solely take advantage of their action as targeting vectors. Proper and rational selection of radionuclide and antibody combinations is critical to making radioimmunotherapy (RIT) a standard therapeutic modality due to the fundamental and significant differences in the emission of either ?- and ?-particles. The ?-particle has a short path length (50-80 ?m) that is characterized by high linear energy transfer (?100 keV/?m). Actively targeted ?-therapy potentially offers a more specific tumor cell killing action with less collateral damage to the surrounding normal tissues than ß-emitters. These properties make targeted ?-therapy appropriate therapies to eliminate of minimal residual or micrometastatic disease. RIT using ?-emitters such as 213Bi, 211At, 225Ac, and others has demonstrated significant activity in both in vitro and in vivo model systems. Limited numbers of clinical trials have progressed to demonstrate safety, feasibility, and therapeutic activity of targeted ?-therapy, despite having to traverse complex obstacles. Further advances may require more potent isotopes, additional sources and more efficient means of isotope production. Refinements in chelation and/or radiolabeling chemistry combined with rational improvements of isotope delivery, targeting vectors, molecular targets, and identification of appropriate clinical applications remains as active areas of research. Ultimately, randomized trials comparing targeted ?-therapy combined with integration into existing standard of care treatment regimens will determine the clinical utility of this modality. PMID:17992276

  12. Crystal structure of [Y6(?6-O)(?3-OH)8(H2O)24]I8·8H2O

    PubMed Central

    Le Natur, François; Calvez, Guillaume; Guillou, Olivier; Daiguebonne, Carole; Bernot, Kevin

    2014-01-01

    The crystal structure of the title compound {systematic name: octa-?3-hydroxido-?6-oxido-hexa­kis­[tetra­aqua­yttrium(III)] octa­iodide octa­hydrate}, is characterized by the presence of the centrosymmetric mol­ecular entity [Y6(?6-O)(?3-OH)8(H2O)24]8+, in which the six Y3+ cations are arranged octa­hedrally around a ?6-O atom at the centre of the cationic complex. Each of the eight faces of the Y6 octa­hedron is capped by an ?3-OH group in the form of a distorted cube. In the hexa­nuclear entity, the Y3+ cations are coordinated by the central ?6-O atom, the O atoms of four ?3-OH and of four water mol­ecules. The resulting coordination sphere of the metal ions is a capped square-anti­prism. The crystal packing is quite similar to that of the ortho­rhom­bic [Ln 6(?6-O)(?3-OH)8(H2O)24]I8·8H2O structures with Ln = La—Nd, Eu—Tb, Dy, except that the title compound exhibits a slight monoclinic distortion. The proximity of the cationic complexes and the lattice water mol­ecules leads to the formation of a three-dimensional hydrogen-bonded network of medium strength. PMID:25552996

  13. The influence of yttrium dopant on the properties of anatase nanoparticles and the performance of dye-sensitized solar cells.

    PubMed

    Zhao, Bingxin; Wang, Jinshu; Li, Hongyi; Wang, Hong; Jia, Xinjian; Su, Penglei

    2015-06-14

    TiO2 mesoporous nanoparticles (NPs) doped with yttrium (Y) ions are fabricated via an environmentally friendly and facile solvothermal method to serve as a photoanode for dye sensitized solar cells (DSSCs). X-ray diffraction, X-ray photoelectron spectroscopy, transmission electron microscopy and N2 adsorption-desorption tests are used to characterize the influence of yttrium dopant on the properties of TiO2 NPs. The prepared Y-doped TiO2 NPs show the anatase phase and exhibit Ti-O-Y bonds. The photovoltaic performance is primarily associated with the morphological parameters of the NPs. At the optimum Y concentration of 3 at%, the short circuit current density increased from 13.20 to 15.74 mA cm(-2), full sun solar power conversion efficiencies increased from 6.09% up to 7.61% as compared to the blank DSSC. PMID:25978149

  14. First principles DFT investigation of yttrium-decorated boron-nitride nanotube: Electronic structure and hydrogen storage

    NASA Astrophysics Data System (ADS)

    Jain, Richa Naja; Chakraborty, Brahmananda; Ramaniah, Lavanya M.

    2015-06-01

    The electronic structure and hydrogen storage capability of Yttrium-doped BNNTs has been theoretically investigated using first principles density functional theory (DFT). Yttrium atom prefers the hollow site in the center of the hexagonal ring with a binding energy of 0.8048eV. Decorating by Y makes the system half-metallic and magnetic with a magnetic moment of 1.0µB. Y decorated Boron-Nitride (8,0) nanotube can adsorb up to five hydrogen molecules whose average binding energy is computed as 0.5044eV. All the hydrogen molecules are adsorbed with an average desorption temperature of 644.708 K. Taking that the Y atoms can be placed only in alternate hexagons, the implied wt% comes out to be 5.31%, a relatively acceptable value for hydrogen storage materials. Thus, this system can serve as potential hydrogen storage medium.

  15. High-performance carbon-nanotube-based complementary field-effect-transistors and integrated circuits with yttrium oxide

    NASA Astrophysics Data System (ADS)

    Liang, Shibo; Zhang, Zhiyong; Si, Jia; Zhong, Donglai; Peng, Lian-Mao

    2014-08-01

    High-performance p-type carbon nanotube (CNT) transistors utilizing yttrium oxide as gate dielectric are presented by optimizing oxidization and annealing processes. Complementary metal-oxide-semiconductor (CMOS) field-effect-transistors (FETs) are then fabricated on CNTs, and the p- and n-type devices exhibit symmetrical high performances, especially with low threshold voltage near to zero. The corresponding CMOS CNT inverter is demonstrated to operate at an ultra-low supply voltage down to 0.2 V, while displaying sufficient voltage gain, high noise margin, and low power consumption. Yttrium oxide is proven to be a competitive gate dielectric for constructing high-performance CNT CMOS FETs and integrated circuits.

  16. Long-term follow-up of patients who underwent yttrium-90 pituitary implantation for treatment of proliferative diabetic retinopathy

    Microsoft Academic Search

    P. S. Sharp; T. J. Fallon; O. J. Brazier; L. Sandler; G. F. Joplin; E. M. Kohner

    1987-01-01

    Summary  Between 1960 and 1976 117 patients underwent pituitary implantation with yttrium-90 (90Y) for treatment of proliferative retinopathy at the Hammersmith Hospital, London. Mean age at operation was 35±11 years (mean±SD), and mean duration of diabetes 18.6±10.0 years. Mean insulin dosage prior to implant was 67.2±24 units, falling to 30.4±14.9 units post-implant. Thirty-two per cent of patients are still living, 60%

  17. High performance ceramic interconnect material for solid oxide fuel cells (SOFCs): Ca- and transition metal-doped yttrium chromite

    NASA Astrophysics Data System (ADS)

    Yoon, Kyung Joong; Stevenson, Jeffrey W.; Marina, Olga A.

    2011-10-01

    The effect of transition metal substitution on thermal and electrical properties of Ca-doped yttrium chromite was investigated in relation to use as a ceramic interconnect in high temperature solid oxide fuel cells (SOFCs). 10 at.% Co, 4 at.% Ni, and 1 at.% Cu substitution on B-site of 20 at.% Ca-doped yttrium chromite led to a close match of thermal expansion coefficient (TEC) with that of 8 mol% yttria-stabilized zirconia (YSZ), and a single phase Y0.8Ca0.2Cr0.85Co0.1Ni0.04Cu0.01O3 remained stable between 25 and 1100 °C over a wide oxygen partial pressure range. Doping with Cu significantly facilitated densification of yttrium chromite. Ni dopant improved both electrical conductivity and dimensional stability in reducing environments, likely through diminishing the oxygen vacancy formation. Substitution with Co substantially enhanced electrical conductivity in oxidizing atmosphere, which was attributed to an increase in charge carrier density and hopping mobility. Electrical conductivity of Y0.8Ca0.2Cr0.85Co0.1Ni0.04Cu0.01O3 at 900 °C is 57 S cm-1 in air and 11 S cm-1 in fuel (pO2 = 5 × 10-17 atm) environments. Chemical compatibility of doped yttrium chromite with other cell components was verified at the processing temperatures. Based on the chemical and dimensional stability, sinterability, and thermal and electrical properties, Y0.8Ca0.2Cr0.85Co0.1Ni0.04Cu0.01O3 is suggested as a promising SOFC ceramic interconnect to potentially overcome technical limitations of conventional acceptor-doped lanthanum chromites.

  18. Synthesis of nano-scaled yttrium aluminum garnet phosphor by co-precipitation method with HMDS treatment

    Microsoft Academic Search

    Yung-Tang Nien; Yu-Lin Chen; In-Gann Chen; Chii-Shyang Hwang; Yan-Kuin Su; Shoou-Jinn Chang; Fuh-Shyang Juang

    2005-01-01

    The present paper describes the process of preparing nano-scaled and well-crystallized cerium-doped yttrium aluminum garnet (YAG:Ce) crystalline phosphors synthesized by co-precipitation method with the addition of hexamethyldisilazane (HMDS) as OH-scavenging reagent. Thermal analyzer and X-ray diffractometer measurements showed that pure YAG phase could be got at the temperature of 900°C lower than that by solid-state method. It was also found

  19. Electron-Paramagnetic-Resonance Spectra of Nd3+, Dy3+, Er3+, and Yb3+ in Lithium Yttrium Fluoride

    Microsoft Academic Search

    J. P. Sattler; J. Nemarich

    1971-01-01

    The electron-paramagnetic-resonance spectra have been obtained for trivalent neodymium, dysprosium, erbium, and ytterbium in single-crystal samples of the scheelite lithium yttrium fluoride. The measurements were made at X-band frequencies and at 4.2 °K. The ions were found to have axial spectra which, together with chemical arguments, indicate that they occupy Y3+ sites with S4 point symmetry. g factors and hyperfine

  20. Mechanism of vaporization of yttrium and rare earth elements in electrothermal vaporization inductively coupled plasma mass spectrometry

    Microsoft Academic Search

    D. M. Goltz; D. C. Grégoire; C. L. Chakrabarti

    1995-01-01

    The mechanism of vaporization of yttrium and the rare earth elements (REEs) has been studied using graphite furnace atomic absorption spectrometry (GFAAS) and inductively-coupled plasma mass spectrometry (ICP-MS). The appearance temperatures for Y and the REEs obtained by GFAAS were generally identical to the appearance temperatures obtained using ETV-ICP-MS. At lower temperatures, Y and the REEs are predominantly vaporized in

  1. Study of photoreduction of CO2 on yttrium and copper co-doped TiO2 nanoparticles

    Microsoft Academic Search

    Runzhi Pan; Xin Tan; Tao Yu

    2011-01-01

    Yttrium and copper co-doped TiO2 catalysts were prepared by sol-gel method. The photocatalysts were characterized by means of XRD. By co-doping of Y 3+ and Cu 2+ not only could restrain the growth in size and aggregation of the nanoparticles, but also could effectively inhibit phase transformation from anatase phase to rutile. The reduction of CO2 showed that the nano

  2. Treatment of Unresectable Primary and Metastatic Liver Cancer with Yttrium90 Microspheres (TheraSphere®): Assessment of Hepatic Arterial Embolization

    Microsoft Academic Search

    Kent Sato; Robert J. Lewandowski; James T. Bui; Reed Omary; Russell D. Hunter; Laura Kulik; Mary Mulcahy; David Liu; Howard Chrisman; Scott Resnick; Albert A. Nemcek; Robert Vogelzang; Riad Salem

    2006-01-01

    In Canada and Europe, yttrium-90 microspheres (TheraSphere®; MDS Nordion, Ottawa, Canada) are a primary treatment option for primary and secondary hepatic malignancies. We present data\\u000a from 30 patients with hepatocellular carcinoma (HCC) and metastatic liver disease treated with TheraSphere from a single academic\\u000a institution to evaluate the angiographically evident embolization that follows treatment. Seven interventional radiologists\\u000a from one treatment center

  3. Bonding mechanism of a yttrium iron garnet film on Si without the use of an intermediate layer

    NASA Astrophysics Data System (ADS)

    Pantzas, Konstantinos; Patriarche, Gilles; Talneau, Anne; Youssef, Jamal Ben

    2014-10-01

    Direct bonding of yttrium iron garnet (YIG) on silicon without the use of an intermediate bonding layer is demonstrated and characterized using scanning transmission electron microscopy and energy-dispersive x-ray spectroscopy. During the bonding experiment, the garnet is reduced in the presence of oxide-free silicon. As a result, a 5 nm thick SiO2/amorphous-YIG bilayer is formed and welds the garnet to silicon.

  4. Bonding mechanism of a yttrium iron garnet film on Si without the use of an intermediate layer

    SciTech Connect

    Pantzas, Konstantinos, E-mail: konstantinos.pantzas@lpn.cnrs.fr [CNRS-LPN, Route de Nozay, F-91460 Marcoussis (France); Institut P', CNRS-Université de Poitiers - ENSMA - UPR 3346, SP2MI - Téléport 2 Bd Marie Pierre Curie, B.P. 30179, F-86962, Futuroscope Chasseneuil Cedex (France); Patriarche, Gilles; Talneau, Anne [CNRS-LPN, Route de Nozay, F-91460 Marcoussis (France); Youssef, Jamal Ben [Laboratoire de Magnetisme de Bretagne, 6 avenue Le Gorgeu, 29238 Brest Cedex 3 (France)

    2014-10-06

    Direct bonding of yttrium iron garnet (YIG) on silicon without the use of an intermediate bonding layer is demonstrated and characterized using scanning transmission electron microscopy and energy-dispersive x-ray spectroscopy. During the bonding experiment, the garnet is reduced in the presence of oxide-free silicon. As a result, a 5?nm thick SiO{sub 2}/amorphous-YIG bilayer is formed and welds the garnet to silicon.

  5. Low-temperature synthesis and characterization of yttrium–gallium garnet Y 3Ga 5O 12 (YGG)

    Microsoft Academic Search

    Sanjay Mathur; Hao Shen; Asta Leleckaite; Aldona Beganskiene; Aivaras. Kareiva

    2005-01-01

    To obtain yttrium–gallium garnet (Y3Ga5O12, YGG) a simple “chimie douce” method has been developed. This sol–gel method yielded excellent starting gel precursor for the fabrication of YGG phase, which could be used as host material for optical applications. The pattern of X-ray diffraction analysis of the ceramic sample sintered for 10h at 1000°C showed the formation of monophasic Y3Ga5O12 phase.

  6. STS-88 Mission Specialist James Newman suits up before launch

    NASA Technical Reports Server (NTRS)

    1998-01-01

    In the Operations and Checkout Building, STS-88 Mission Specialist James H. Newman takes part in a complete suit check before launch. Newman holds a toy dog, 'Pluto,' representing the crew nickname Dog Crew 3 and Newman's nickname, Pluto. Mission STS-88 is expected to launch at 3:56 a.m. EST with the six-member crew aboard Space Shuttle Endeavour on Dec. 3. Endeavour carries the Unity connecting module, which the crew will be mating with the Russian-built Zarya control module already in orbit. In addition to Unity, two small replacement electronics boxes are on board for possible repairs to Zarya batteries. The mission is expected to last 11 days, 19 hours and 49 minutes, landing at 10:17 p.m. EST on Dec. 14.

  7. Use of CAP88 at Department of Energy sites.

    PubMed

    Snyder, Sandra; Vázquez, Gustavo; Hay, Tristan

    2013-08-01

    The U.S. Department of Energy is committed to protecting the public and environment against undue risk from radiation associated with radiological activities conducted under its control. Some U.S. Department of Energy Site activities result in emissions of radioactive materials to the air. CAP88 codes are used to model these emissions and the subsequent maximum estimated dose to a member of the public in the vicinity of the U.S. Department of Energy Site. This paper reviews the use of the CAP88 code at the variety of U.S. Department of Energy sites that use it for compliance reporting under Title 40 of the Code of Federal Regulations Part 61, Subpart H. PMID:23803670

  8. First principles total energy calculations of the surface atomic structure of yttrium disilicide on Si(1 1 1)

    NASA Astrophysics Data System (ADS)

    Cocoletzi, Gregorio H.; de la Cruz, Ma. T. Romero; Takeuchi, Noboru

    We perform first principles total energy calculations to investigate the adsorption of yttrium silicide on Si. Our studies apply the density functional theory, and use the exchange and correlation potential energies according to the generalized gradient approximation within the Perdew, Burke, Ernzerhof parametrization. We study the formation of a two-dimensional (2D) structure of YSi 2 and the arrangement of a few layers of YSi 1.7 on Si(1 1 1). One monolayer of YSi 2 on Si(1 1 1) assembles in a 2D phase with (1 × 1) periodicity, which is composed of a layer of yttrium atoms on T 4 sites and a silicon bilayer on top. Similar to the structure of rare earth and ScSi 2 structures on Si(1 1 1), this bilayer of Si atoms resembles the ideal Si(1 1 1)-(1 × 1) surface, but rotated 180° with respect to the rest of the crystal. Additional layers of yttrium silicide on Si(1 1 1) build a hexagonal geometry similar to bulk YSi 2: graphite-like Si planes (with vacancies) intercalated with Y planes, and yielding a ( ?{3}×?{3}) periodicity with a YSi 1.7 stoichiometry. As in the formation of a single layer of YSi 2, the surface is terminated by a Si bilayer similar to those of bulk Si along the (1 1 1) direction, but rotated 180°.

  9. Influence of Yttrium Ion-Implantation on the Growth Kinetics and Micro-Structure of NiO Oxide Film

    NASA Astrophysics Data System (ADS)

    Jin, Huiming; Adriana, Felix; Majorri, Aroyave

    2008-02-01

    Isothermal and cyclic oxidation behaviours of pure and yttrium-implanted nickel were studied at 1000°C in air. Scanning electronic microscopy (SEM) and transmission electronic microscopy (TEM) were used to examine the micro-morphology and structure of oxide scales formed on the nickel substrate. It was found that Y-implantation significantly improved the anti-oxidation ability of nickel in both isothermal and cyclic oxidizing experiments. Laser Raman microscopy was also used to study the stress status of oxide scales formed on nickel with and without yttrium. The main reason for the improvement in anti-oxidation of nickel was that Y-implantation greatly reduced the growing speed and grain size of NiO. This fine-grained NiO oxide film might have better high temperature plasticity and could relieve parts of compressive stress by means of creeping, and maintained a ridge character and a relatively low internal stress level. Hence yttrium ion-implantation remarkably enhanced the adhesion of protective NiO oxide scale formed on the nickel substrate.

  10. Study on precipitates in Ni-Al-Mo-B alloy IC6 with addition of excess amount of yttrium

    SciTech Connect

    Xiao, C.; Han, Y. [Beijing Inst. of Aeronautical Materials (China). Cast Superalloys Lab.] [Beijing Inst. of Aeronautical Materials (China). Cast Superalloys Lab.

    1999-08-06

    A directionally solidified (DS) alloy IC6 with the chemical composition of Ni-(7.5-8.5)Al-(13.0-15.0)Mo-(0.02-0.1)Bwt% has been recently developed in BIAM as a high-temperature structural material used for advanced jet-engine blades and vanes operating in the temperature range of 1,050--1,150 C. The alloy not only has high yield strength and fairly good ductility from room temperature to 1,100 C, but also has high creep resistance in the temperature range 760--1,100 C. Alloy IC6 has low density (7.9 g/cm{sup 3}), low cost, high melting temperature (1,300 C). Its high temperature oxidation resistance is substantially improved by adding proper amounts of yttrium but decreases with addition of excess amount of yttrium. The purpose of this paper is to investigate the precipitates in alloy IC6 due to the presence of yttrium.

  11. Effect of boron and yttrium on the phase composition and the microstructure of natural Nb-Si composites

    NASA Astrophysics Data System (ADS)

    Chumarev, V. M.; Leont'ev, L. I.; Udoeva, L. Yu.; Sel'menskikh, N. I.; Gulyaeva, R. I.; Zhidovinova, S. V.; Larionov, A. V.

    2014-09-01

    The phase formation in Nb-Si composites of a eutectic composition alloyed with 0.2-2.0 at % B and 0.9-6.0 at % Y is considered on model specimens prepared by vacuum arc melting. The phase composition of three-component alloys and the phase transformation temperatures are determined by physicochemical analysis, the specimen density and microhardness have been measured, and the content of alloying elements in the alloys has been determined. It is found that the solidus and liquidus temperatures of the alloyed alloys are almost unchanged within the yttrium and boron concentrations under study, and the difference between the densities of the model specimens and the base Nb-18.7 at % Si is ±1.6%. The introduction of yttrium and boron into the natural Nb-18.7 at % Si composite increases the microstructure dispersion and influences the composition of the strengthening phase: yttrium stabilizes high-temperature silicide Nb3Si at low temperatures, and boron, conversely, catalyzes its decomposition with formation of ?-Nb5Si3.

  12. 88. Photocopied August 1978. STATION GENERATORS LOOKING EAST FROM THE ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    88. Photocopied August 1978. STATION GENERATORS LOOKING EAST FROM THE CENTRAL GALLERY, AUGUST 11, 1914. BY THIS DATE MICHIGAN NORTHERN HAD COMPLETED THE INSTALLATION OF GENERATORS IN THE EASTERN HALF OF THE POWER HOUSE AND HAD BEGUN WORK ON THE WEST. THE MOTOR-GENERATORS PURSHASED BY THE M.L.S.P.C. IN 1902 CAN BE SEEN ON THE LEFT BY THE LINE OF COLUMNS. (910) - Michigan Lake Superior Power Company, Portage Street, Sault Ste. Marie, Chippewa County, MI

  13. 88. VIEW OF OXIDIZER APRON ON EAST SIDE OF LSB ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    88. VIEW OF OXIDIZER APRON ON EAST SIDE OF LSB (BLDG. 751). LIQUID OXYGEN TOPPING TANK ON RIGHT; GASEOUS NITROGEN IN CENTER; LIQUID OXYGEN RAPID-LOAD TANK ON LEFT. SKID 9 ON RIGHT; SKID 7 IN CENTER; SKID 9A ON LEFT. FEATURES LEFT TO RIGHT IN BACKGROUND: LAUNCH DECK, UMBILICAL MAST, MST, AND NORTH CAMERA TOWER. - Vandenberg Air Force Base, Space Launch Complex 3, Launch Pad 3 East, Napa & Alden Roads, Lompoc, Santa Barbara County, CA

  14. Automatic minimisation of micromotion in a 88Sr+ optical clock

    NASA Astrophysics Data System (ADS)

    Barwood, G. P.; Huang, G.; Klein, H. A.; Gill, P.

    2015-07-01

    Optical clocks based on narrow linewidth transitions in single cold ions confined in RF traps are being developed at a number of laboratories worldwide. For these ion clock systems, excess micromotion can cause both Stark and Doppler frequency shifts and also a degradation of frequency stability as a result of a reduced excitation rate to the clock transition. At NPL, we detect micromotion in our 88Sr+ optical clocks by observing the correlation between photon arrival times and the zero crossing of the RF trap drive signal. Recently, two nominally identical 88Sr+ optical clocks have been operated over several days and their frequencies compared against one another. During this time the dc voltages on the endcap and compensation voltage electrodes required to minimise the micromotion can change significantly, particularly following the loading of an ion. This paper describes an automatic method to monitor and minimise micromotion applicable to single ion clocks and which we demonstrate using our two NPL 88Sr+ ion clocks.

  15. Combustion Synthesis of Yttrium BARIUM(2) COPPER(3) OXYGEN(6+X) Superconductor.

    NASA Astrophysics Data System (ADS)

    Lin, Sy-Chyi

    YBa_2Cu_3 O_{rm 6 + x} was produced from copper, barium peroxide, and yttrium oxide by Self-propagating High-temperature Synthesis (SHS) and thermal explosion methods. The SHS process was conducted in two modes: a horizontal combustion and a vertical combustion. The influence of copper particle size on the stability of the reaction front was studied. In contrast to previous studies, a stable reaction front could be maintained even when relatively large copper particles (smaller than 325 mesh) were used. In the horizontal SHS process, large diameter pellets (larger than 22 mm in diameter) enabled stable combustion at room temperature. Elevated ambient temperatures (400 {~} 500^circ C) were needed to stabilize the combustion front movement in small diameter pellets. The product had an average concentration of 84 wt% YBa_2Cu _3O_{rm 6 + x}. In the vertical SHS process, with the aid of a booster, the combustion front moved more rapidly and smoothly than that in the horizontal SHS process and gave a product concentration of about 90 wt% YBa _2Cu_3O_ {rm 6 + x}. High quality product (above 95 wt% YBa_2Cu_3 O_{rm 6 + x}) may be obtained by sintering/calcining the SHS product in an oxygen atmosphere. Three different sintering/calcining processes were studied and the required temperature and the time for each process were determined. The temperature at the center of the pellet in a vertical SHS was measured by thermocouples. The pellet temperature rise is a two step process. The first temperature rise is caused by the oxidation of the copper and the second is caused by the reaction between yttrium oxide and barium cuprate. A reaction mechanism is proposed to explain this behavior. A thermal explosion process was conducted in a continuous rotary kiln. In this mode a pellet was introduced suddenly into a heated rotary kiln causing it to be combusted. After the combustion, the pellet was sintered at 900 to 980 ^circC and a product containing about 95 wt% YBa_2Cu_3 O_{rm 6 + x} was obtained. The impacts of the thermal explosion temperature and the sintering conditions on the product quality were studied. The best temperature was found to be 800 ^circC and 100 minutes was sufficient for the pellet to reach equilibrium.

  16. Synthesis and in-depth analysis of highly ordered yttrium doped hydroxyapatite nanorods prepared by hydrothermal method and its mechanical analysis

    SciTech Connect

    Nathanael, A. Joseph [Department of Physics, Bharathiar University, Coimbatore-641 046, Tamil Nadu (India); Department of Nanomaterials Engineering, Chungnam National University, Daejeon, 305-764 (Korea, Republic of); Mangalaraj, D., E-mail: dmraj800@yahoo.com [Department of Nanoscience and Technology, Bharathiar University, Coimbatore-641 046, Tamil Nadu (India); Hong, S.I., E-mail: sihong@cnu.ac.kr [Department of Nanomaterials Engineering, Chungnam National University, Daejeon, 305-764 (Korea, Republic of); Masuda, Y. [National Institute of Advanced Industrial Science and Technology (AIST), 2266-98 Anagahora, Shimoshidami, Moriyama-ku, Nagoya 463-8560 (Japan)

    2011-12-15

    In this study, undoped and yttrium (Y) doped nanocrystalline hydroxyapatite crystals were synthesized by the hydrothermal method at 180 Degree-Sign C for 24 h. Highly ordered and oriented hydroxyapatite (HAp) nanorods were prepared by yttrium doping and their nanostructure and physical properties were compared with those of undoped HAp rods. FESEM images showed that the doping with Y ions reduced the diameter (from 25 nm to 15 nm) and increased the length (from 95 nm to 115 nm) of the synthesized rods. The aspect ratio of the undoped and Y-doped nanorods were calculated to be 4.303 (SD = 0.0959) and 7.61 (SD = 0.0355), respectively. Specific surface area (SSA) analysis showed that SSA also increased from 66.74 m{sup 2}/g to 68.57 m{sup 2}/g with the addition of yttrium. Y-doped HAp nanorod reinforced HMWPE composites displayed the better mechanical performance than those reinforced with pure HAp nanorods. The possible strengthening of nanorods and the increase of SSA due to the reduction in the size of nanorods in the presence of yttrium may have contributed to the strengthening of Y-doped HAp/HMWPE composites. - Graphical Abstract: Highly ordered and oriented yttrium doped hydroxyapatite (HAp) nanorods were prepared by hydrothermal method. For undoped HAp the average length of the nanorod is 95 nm with mean diameter of 24 nm and for a Y doped nanorod the average length is {approx} 115 nm and the mean diameter is 15 nm. Mechanical analysis was carried out by polymer/nanoparticle composite method. Highlights: Black-Right-Pointing-Pointer Yttrium doped hydroxyapatite nanorods were prepared by hydrothermal method. Black-Right-Pointing-Pointer The nanorods have highly uniform size distribution. Black-Right-Pointing-Pointer Yttrium substitution and nanostructure formation was confirmed by careful analysis. Black-Right-Pointing-Pointer Mechanical strength was analyzed by polymer nanoparticle reinforcement method.

  17. Evaluation of magnesium-yttrium alloy as an extraluminal tracheal stent.

    PubMed

    Luffy, Sarah A; Chou, Da-Tren; Waterman, Jenora; Wearden, Peter D; Kumta, Prashant N; Gilbert, Thomas W

    2014-03-01

    Tracheomalacia is a relatively rare problem, but can be challenging to treat, particularly in pediatric patients. Due to the presence of mechanically deficient cartilage, the trachea is unable to resist collapse under physiologic pressures of respiration, which can lead to acute death if left untreated. However, if treated, the outcome for patients with congenital tracheomalacia is quite good because the cartilage tends to spontaneously mature over a period of 12 to 18 months. The present study investigated the potential for the use of degradable magnesium-3% yttrium alloy (W3) to serve as an extraluminal tracheal stent in a canine model. The host response to the scaffold included the formation of a thin, vascularized capsule consisting of collagenous tissue and primarily mononuclear cells. The adjacent cartilage structure was not adversely affected as observed by bronchoscopic, gross, histologic, and mechanical analysis. The W3 stents showed reproducible spatial and temporal fracture patterns, but otherwise tended to corrode quite slowly, with a mix of Ca and P rich corrosion product formed on the surface and observed focal regions of pitting. The study showed that the approach to use degradable magnesium alloys as an extraluminal tracheal stent is promising, although further development of the alloys is required to improve the resistance to stress corrosion cracking and improve the ductility. PMID:23554285

  18. Study-parameter impact in quantitative 90-Yttrium PET imaging for radioembolization treatment monitoring and dosimetry.

    PubMed

    Goedicke, Andreas; Berker, Yannick; Verburg, Frederik Anton; Behrendt, Florian Friedrich; Winz, Oliver; Mottaghy, Felix Manuel

    2013-03-01

    A small positron-generating branch in 90-Yttrium ((90)Y) decay enables post-therapy dose assessment in liver cancer radioembolization treatment. The aim of this study was to validate clinical (90)Y positron emission tomography (PET) quantification, focusing on scanner linearity as well as acquisition and reconstruction parameter impact on scanner calibration. Data from three dedicated phantom studies (activity range: 55.2 MBq-2.1 GBq) carried out on a Philips Gemini TF 16 PET/CT scanner were analyzed after reconstruction with up to 361 parameter configurations. For activities above 200 MBq, scanner linearity could be confirmed with relative error margins 4%. An acquisition-time-normalized calibration factor of 1.04 MBq·s/CNTS was determined for the employed scanner. Stable activity convergence was found in hot phantom regions with relative differences in summed image intensities between -3.6% and +2.4%. Absolute differences in background noise artifacts between - 79.9% and + 350% were observed. Quantitative accuracy was dominated by subset size selection in the reconstruction. Using adequate segmentation and optimized acquisition parameters, the average activity recovery error induced by the axial scanner sensitivity profile was reduced to +2.4%±3.4% (mean ± standard deviation). We conclude that post-therapy dose assessment in (90)Y PET can be improved using adapted parameter setups. PMID:23047863

  19. Spectral properties of the dysprosium ion (Dy3 ) in yttrium aluminum garnet

    Microsoft Academic Search

    Z. T. Azamatov; P. A. Arsen'ev; K. É. Binert; M. V. Chukichev

    1970-01-01

    The absorption and luminescence spectra of Dy3 in yttrium aluminum garnet have been studied at room and liquid-nitrogen temperatures. From these spectra a scheme is constructed for the energy levels of the states 4F_{{raise0.5exhboxriptstyle 9kern-0.1em\\/kern-0.15emlower0.25exhboxriptstyle 2}} ,6F_{{raise0.5exhboxriptstyle 1kern-0.1em\\/kern-0.15emlower0.25exhboxriptstyle 2}} ,6F_{{raise0.5exhboxriptstyle 3kern-0.1em\\/kern-0.15emlower0.25exhboxriptstyle 2}} ,6F_{{raise0.5exhboxriptstyle 9kern-0.1em\\/kern-0.15emlower0.25exhboxriptstyle 2}} ,6F_{{raise0.5exhboxriptstyle 7kern-0.1em\\/kern-0.15emlower0.25exhboxriptstyle 2}} and6H_{{raise0.5exhboxriptstyle {15}kern-0.1em\\/kern-0.15emlower0.25exhboxriptstyle 2}} . A study of the IR absorption spectrum is

  20. Structural and spectroscopic analyses of europium doped yttrium oxyfluoride powders prepared by combustion synthesis

    SciTech Connect

    Rakov, Nikifor [PG-Ciência dos Materiais, Universidade Federal do Vale do São Francisco, 48902-300 Juazeiro, BA (Brazil)] [PG-Ciência dos Materiais, Universidade Federal do Vale do São Francisco, 48902-300 Juazeiro, BA (Brazil); Guimarães, R. B.; Maciel, Glauco S. [Instituto de Física, Universidade Federal Fluminense, 24210-346 Niterói, RJ (Brazil)] [Instituto de Física, Universidade Federal Fluminense, 24210-346 Niterói, RJ (Brazil); Lozano B, W. [Departamento de Física, Universidade Federal de Pernambuco, 50670-901 Recife, PE (Brazil)] [Departamento de Física, Universidade Federal de Pernambuco, 50670-901 Recife, PE (Brazil)

    2013-07-28

    A facile widely spread technique employed to produce low-cost high-yield oxide powders, combustion synthesis, was used to prepare yttrium oxyfluoride crystalline ceramic powders. The structure of the powders was analyzed by X-ray powder diffraction and Rietveld refinement. Samples heat treated at 700 °C had a predominance of vernier orthorhombic Y{sub 6}O{sub 5}F{sub 8} phase, while samples heat treated at 800 °C crystallized in stoichiometric rhombohedral YOF phase. The samples were doped with luminescent europium trivalent ions (Eu{sup 3+}) in different concentrations (1–15 wt.%) and Judd-Ofelt theory was used to probe the distortion from the inversion symmetry of the local crystal field and the degree of covalency between the rare-earth ion and the surrounding ligands. The luminescence lifetime was measured and the luminescence quantum efficiency (LQE) was estimated. We observed that Eu{sup 3+}:Y{sub 6}O{sub 5}F{sub 8} samples presented higher LQE in spite of the larger local crystal field anisotropy found for Eu{sup 3+}:YOF samples.

  1. Crystal structure, phase, and optical properties of yttrium-doped hafnium oxide nanocrystalline thin films

    NASA Astrophysics Data System (ADS)

    Ortega, Alejandro

    Yttrium-doped hafnium oxide (YDH) nanocrystalline films were produced by sputter-deposition at various substrate times and temperatures, to produce YDH films in a wide range of thicknesses, dYDH˜25 to 1100 nm. The deposition was made onto optical grade quartz and sapphire substrates. Samples deposited on sapphire were subject to post-deposition annealing (PDA) at various times (3-24 hr) and temperatures (1100 - 1500 °C). The effect of d ¬ YDH on the crystal structure, surface/interface morphology and optical properties of YDH films was investigated. X-ray diffraction analyses revealed the formation of monoclinic phase for relatively thin films (<150nm). The evolution towards stabilized cubic phase with increasing dYDH ¬¬ is observed. The scanning electron microscopy results indicate the dense, columnar structure of YDH films as a function of dYDH. Spectrophotometry analyses indicate that the grown YDH films are transparent and exhibit interference fringes. The band gap was found to be ˜ 5.60 eV for monoclinic YDH films while distinct separation and an increase in band gap to 6.03 eV is evident with increasing dYDH and formation cubic YDH films. The PDA films band gaps were found to be between 5.31 and 5.72 eV, all of which exhibit secondary gaps. A correlation between growth conditions, annealing, phase evolution, and optical properties of the YDH nanocrystalline thin films is established.

  2. Pressure effect on elastic, lattice dynamic and superconducting behaviour of yttrium sulfide: A first principle study

    SciTech Connect

    Sahoo, B. D., E-mail: bdsahoo@barc.gov.in; Joshi, K. D.; Gupta, Satish C. [Applied Physics Division, Bhabha Atomic Research Centre, Mumbai 400085 (India)

    2014-03-28

    First principles calculations have been carried out to analyze structural, elastic, and dynamic stability of yttrium sulphide (YS) under hydrostatic compression. The comparison of enthalpies of rocksalt type (B1) and CsCl type cubic (B2) structures determined as a function of compression suggests the B1 ? B2 transition at ?49?GPa (the same transition occurs at ?48?GPa at 300?K). Various physical quantities such as zero pressure equilibrium volume, bulk modulus, and pressure derivative of bulk modulus have been derived from the theoretically determined equation of state. The single crystal elastic constants derived from the energy strain method agree well with the experimental values. The activation barrier between B1 and B2 phases calculated at transition point is ?17/mRy/f.u. Our lattice dynamic calculations show that at ambient condition, the B1 phase is lattice dynamically stable, and frequencies of phonon modes in different high symmetry directions of Brillouin zone agrees well with experimental values. The B2 phase also is dynamical stable at ambient condition as well as at ?49?GPa, supporting our static lattice calculation. The effect of temperature on volume and bulk modulus of the YS in B1 phase has also been examined. The superconducting temperature of ?2.78?K determine at zero pressure agrees well with experimental data. The effect of pressure is found to suppress the superconducting nature of this material.

  3. Synthesis and optical characteristics of yttrium-doped zinc oxide nanorod arrays grown by hydrothermal method.

    PubMed

    Park, Hyunggil; Kim, Younggyu; Ji, Iksoo; Lee, Sang-Heon; Kim, Jin Soo; Kim, Jin Soo; Leem, Jae-Young

    2014-11-01

    Yttrium-doped ZnO (YZO) nanorods were synthesized by hydrothermal growth on a quartz substrate with various post-annealing temperatures. To investigate the effects of post-annealing on the optical properties and parameters of the nanorods, X-ray diffractometry (XRD), photoluminescence (PL) measurement, and ultraviolet (UV)-visible spectroscopy were used. From the XRD investigation, the full width at half maximum (FWHM) and the dislocation density of the nanorods was found to increase with an increase in the post-annealing temperature. In the PL spectra, the intensity of the near band edge (NBE) emission peak in the UV region also increases with an increase in the temperature of post-annealing. The deep level emission (DLE) peak in the visible region changes with various post-annealing temperatures, and its intensity increases remarkably with post-annealing at 800 degrees C. In this paper, changes in the optical parameters of the nanorods caused by variation in the behavior of Y during post-annealing was investigated, with properties such as absorption coefficients, refractive indices, and dispersion parameters being obtained from transmittance and reflectance analysis. PMID:25958523

  4. Surface-directed synthesis of erbium-doped yttrium oxide nanoparticles within organosilane zeptoliter containers.

    PubMed

    Englade-Franklin, Lauren E; Morrison, Gregory; Verberne-Sutton, Susan D; Francis, Asenath L; Chan, Julia Y; Garno, Jayne C

    2014-09-24

    We introduce an approach to synthesize rare earth oxide nanoparticles using high temperature without aggregation of the nanoparticles. The dispersity of the nanoparticles is controlled at the nanoscale by using small organosilane molds as reaction containers. Zeptoliter reaction vessels prepared from organosilane self-assembled monolayers (SAMs) were used for the surface-directed synthesis of rare earth oxide (REO) nanoparticles. Nanopores of octadecyltrichlorosilane were prepared on Si(111) using particle lithography with immersion steps. The nanopores were filled with a precursor solution of erbium and yttrium salts to confine the crystallization step to occur within individual zeptoliter-sized organosilane reaction vessels. Areas between the nanopores were separated by a matrix film of octadecyltrichlorosilane. With heating, the organosilane template was removed by calcination to generate a surface array of erbium-doped yttria nanoparticles. Nanoparticles synthesized by the surface-directed approach retain the periodic arrangement of the nanopores formed from mesoparticle masks. While bulk rare earth oxides can be readily prepared by solid state methods at high temperature (>900 °C), approaches for preparing REO nanoparticles are limited. Conventional wet chemistry methods are limited to low temperatures according to the boiling points of the solvents used for synthesis. To achieve crystallinity of REO nanoparticles requires steps for high-temperature processing of samples, which can cause self-aggregation and dispersity in sample diameters. The facile steps for particle lithography address the problems of aggregation and the requirement for high-temperature synthesis. PMID:25163977

  5. Structural and optical properties of yttrium oxide thin films for planar waveguiding applications

    SciTech Connect

    Pearce, Stuart J.; Parker, Greg J.; Charlton, Martin D. B.; Wilkinson, James S. [Electronic and Computer Science, Southampton University, Southampton SO17 1BJ (United Kingdom); Optoelectronics Research Center, Southampton University, Southampton SO17 1BJ (United Kingdom)

    2010-11-15

    Thin films of yttrium oxide, Y{sub 2}O{sub 3}, were deposited by reactive sputtering and reactive evaporation to determine their suitability as a host for a rare earth doped planar waveguide upconversion laser. The optical properties, structure, and crystalline phase of the films were found to be dependent on the deposition method and process parameters. X-ray diffraction analysis on the ''as-deposited'' thin films revealed that the films vary from amorphous to highly crystalline with a small broad peak at 29 deg. corresponding to the <222> reflections of Y{sub 2}O{sub 3}. The samples with the polycrystalline structure had a stoichiometry close to bulk cubic Y{sub 2}O{sub 3}. Scanning electron microscopy imaging revealed a regular column structure confirming their crystalline nature. The thin film layers which allowed guiding in both visible and infrared regions had lower refractive indices, higher oxygen content, and a more amorphous structure. Higher oxygen pressures during the deposition lead to a more amorphous layer.

  6. Yttrium oxide nanoparticles prevent photoreceptor death in a light-damage model of retinal degeneration.

    PubMed

    Mitra, Rajendra N; Merwin, Miles J; Han, Zongchao; Conley, Shannon M; Al-Ubaidi, Muayyad R; Naash, Muna I

    2014-10-01

    Photoreceptor (PR) cells are prone to accumulation of reactive oxygen species (ROS) and oxidative stress. An imbalance between the production of ROS and cellular antioxidant defenses contributes to PR degeneration and blindness in many different ocular disease states. Yttrium oxide (Y2O3) nanoparticles (NPs) are excellent free radical scavengers owing to their nonstoichiometric crystal defects. Here we utilize a murine light-stress model to test the efficacy of Y2O3 NPs (~10-14nm in diameter) in ameliorating retinal oxidative stress-associated degeneration. Our studies demonstrate that intravitreal injections of these NPs at doses ranging from 0.1 to 5.0µM 2 weeks before acute light stress protect PRs from degeneration. This protection is reflected both structurally (i.e., decreased light-associated thinning of the outer nuclear layer) and functionally (i.e., preservation of scotopic and photopic electroretinogram amplitudes). We also observe preservation of structure and function when NPs are delivered immediately after acute light stress, although the magnitude of the preservation is smaller, and only doses ranging from 1.0 to 5.0µM were effective. We show that the Y2O3 NPs are nontoxic and well tolerated after intravitreal delivery. Our results suggest that Y2O3 NPs have astonishing antioxidant benefits and, with further exploration, may be an excellent strategy for the treatment of oxidative stress associated with multiple forms of retinal degeneration. PMID:25066531

  7. Hydrosilylation of dienes by yttrium hydrido complexes containing a linked amido-cyclopentadienyl ligand.

    PubMed

    Trifonov, Alexander A; Spaniol, Thomas P; Okuda, Jun

    2004-08-01

    The dimeric hydrido complex [Y(L)(THF)(mu-H)](2)() containing the CH(2)SiMe(2)-linked amido-cyclopentadienyl ligand L = C(5)Me(4)CH(2)SiMe(2)NCMe(3)(2-) catalyzed the hydrosilylation of 1,5-hexadiene, 1,7-octadiene and vinylcyclohexene by PhSiH(3). As demonstrated for 1,7-octadiene, the product distribution of the hydrosilylation strongly depends on the molar ratio of the reagents. In the absence of PhSiH(3), the stoichiometric reaction of with 1,5-hexadiene gave the isolable crystalline cyclopentylmethyl complex [Y(L)[CH(2)CH(CH(2))(4)](THF)]. Internal olefins such as trans-stilbene and alkynes such as tert-butylacetylene were not hydrosilylated by. trans-Stilbene was inserted into the yttrium-hydride bond of to give the 1,2-diphenylethyl complex [Y(L)[CH(CH(2)Ph)Ph](THF)]. tert-Butylacetylene reacted with to give the dimeric acetylide [Y(L)(C[triple bond]CCMe(3))](2). In an attempt to detect the monomeric hydrido species as a DME adduct [Y(L)H(DME)], complex was reacted with DME to form the sparingly soluble, dimeric 2-methoxyethoxy complex [Y(L)(mu-OCH(2)CH(2)OMe-kappaO)](2) under C-O splitting. PMID:15278114

  8. Crystal structure and phase transformations of calcium yttrium orthophosphate, Ca 3Y(PO 4) 3

    NASA Astrophysics Data System (ADS)

    Fukuda, Koichiro; Iwata, Tomoyuki; Niwa, Takahiro

    2006-11-01

    Crystal structure and phase transformations of calcium yttrium orthophosphate Ca 3Y(PO 4) 3 were investigated by X-ray powder diffraction, selected-area electron diffraction, transmission electron microscopy and optical microscopy. The high-temperature phase is isostructural with eulytite, cubic (space group I4¯3d) with a=0.983320(5) nm, V=0.950790(8) nm 3, Z=4 and D x=3.45 Mg m -3. The crystal structure was refined with a split-atom model, in which the oxygen atoms are distributed over two partially occupied sites. Below the stable temperature range of eulytite, the crystal underwent a martensitic transformation, which is accompanied by the formation of platelike surface reliefs. The inverted crystal is triclinic (space group P1) with a=1.5726(1) nm, b=0.84267(9) nm, c=0.81244(8) nm, ?=109.739(4)°, ?=90.119(5)°, ?=89.908(7)°, V=1.0134(1) nm 3, Z=4 and D x=3.24 Mg m -3. The crystal grains were composed of pseudo-merohedral twins. The adjacent twin domains were related by the pseudo-symmetry mirror planes parallel to {101¯} with the composition surface {101¯}. When the eulytite was cooled relatively slowly from the stable temperature range, the decomposition reaction of Ca 3Y(PO 4) 3? ?-Ca 3(PO 4) 2+YPO 4 occurred.

  9. Urinary monitoring of exposure to yttrium, scandium, and europium in male Wistar rats.

    PubMed

    Kitamura, Yasuhiro; Usuda, Kan; Shimizu, Hiroyasu; Fujimoto, Keiichi; Kono, Rei; Fujita, Aiko; Kono, Koichi

    2012-12-01

    On the assumption that rare earth elements (REEs) are nontoxic, they are being utilized as replacements of toxic heavy metals in novel technological applications. However, REEs are not entirely innocuous, and their impact on health is still uncertain. In the past decade, our laboratory has studied the urinary excretion of REEs in male Wistar rats given chlorides of europium, scandium, and yttrium solutions by one-shot intraperitoneal injection or oral dose. The present paper describes three experiments for the suitability and appropriateness of a method to use urine for biological monitoring of exposure to these REEs. The concentrations of REEs were determined in cumulative urine samples taken at 0-24 h by inductively coupled plasma atomic emission spectroscopy, showing that the urinary excretion of REEs is <2 %. Rare earth elements form colloidal conjugates in the bloodstream, which make high REEs accumulation in the reticuloendothelial system and glomeruli and low urinary excretion. The high sensitivity of inductively coupled plasma-argon emission spectrometry analytical methods, with detection limits of <2 ?g/L, makes urine a comprehensive assessment tool that reflects REE exposure. The analytical method and animal experimental model described in this study will be of great importance and encourage further discussion for future studies. PMID:23011662

  10. Percutaneous yttrium aluminum garnet-laser lithotripsy of intrahepatic stones and casts after liver transplantation.

    PubMed

    Schlesinger, Nis Hallundbaek; Svenningsen, Peter; Frevert, Susanne; Wettergren, André; Hillingsø, Jens

    2015-06-01

    Bile duct stones and casts (BDSs) contribute importantly to morbidity after liver transplantation (LT). The purpose of this study was to estimate the clinical efficacy, safety, and long-term results of percutaneous transhepatic cholangioscopic lithotripsy (PTCSL) in transplant recipients and to discuss underlying factors affecting the outcome. A retrospective chart review revealed 18 recipients with BDSs treated by PTCSL laser lithotripsy with a holmium-yttrium aluminum garnet laser probe at 365 to 550 µm. They were analyzed in a median follow-up time of 55 months. In all but 1 patient (17/18 or 94%), it was technically feasible to clear all BDSs with a mean of 1.3 sessions. PTCSL was unsuccessful in 1 patient because of multiple stones impacting the bile ducts bilaterally; 17% had early complications (Clavien II). All biliary casts were successfully cleared; 39% had total remission; 61% needed additional interventions in the form of percutaneous transhepatic cholangiography and dilation (17%), re-PTCSL (11%), self-expandable metallic stents (22%), or hepaticojejunostomy (6%); and 22% eventually underwent retransplantation. The overall liver graft survival rate was 78%. Two patients died during follow-up for reasons not related to their BDS. Nonanastomotic strictures (NASs) were significantly associated with treatment failure. We conclude that PTCSL in LT patients is safe and feasible. NASs significantly increased the risk of relapse. Repeated minimally invasive treatments, however, prevented graft failure in 78% of the cases. Liver Transpl 21:831-837, 2015. © 2015 AASLD. PMID:25821134

  11. Use of Yttrium-90 Microspheres in the Treatment of Unresectable Hepatic Metastases From Breast Cancer

    SciTech Connect

    Coldwell, Douglas M. [Department of Radiology, University of Mississippi Medical Center, Jackson, MS (United States)], E-mail: dmcoldwellmd@aol.com; Kennedy, Andrew S. [Wake Radiology Oncology, Cary, NC (United States); Nutting, Charles W. [Sky Ridge Medical Center, Lone Tree, CO (United States)

    2007-11-01

    Purpose: Therapy for patients with unresectable liver metastases from breast cancer that were refractory to multiple treatment regimens was performed using radioactive microspheres. High doses of radiation were delivered to tumors from these permanently implanted yttrium-90 ({sup 90}Y) microspheres, delivered through the hepatic arterial vessels. Methods and Materials: Women from three institutions were selected for treatment, after screening that demonstrated vascular access to all tumors and after imaging confirmed that microspheres would be implanted only in the liver tumors. All patients were followed with laboratory and imaging studies at regular intervals until death. Toxicities, both acute and late were recorded, and actuarial survival determined. Results: A total of 44 women were treated from April 2002 to April 2005. Median follow-up of these women was 14 months (1-42 months). No treatment-related procedure deaths or radiation related veno-occlusive liver failures were found. Computed tomographic imaging partial response was 47% and positron emission tomographic response 95%. Conclusion: In this group of heavily pretreated patients, radioactive microspheres produced an encouraging median survival, with acceptable toxicity and a significant objective response rate, suggesting that further investigation of this approach is warranted.

  12. Structure and dynamics in yttrium-based molten rare earth alkali fluorides

    NASA Astrophysics Data System (ADS)

    Levesque, Maximilien; Sarou-Kanian, Vincent; Salanne, Mathieu; Gobet, Mallory; Groult, Henri; Bessada, Catherine; Madden, Paul A.; Rollet, Anne-Laure

    2013-05-01

    The transport properties of molten LiF-YF3 mixtures have been studied by pulsed field gradient nuclear magnetic resonance spectroscopy, potentiometric experiments, and molecular dynamics simulations. The calculated diffusion coefficients and electric conductivities compare very well with the measurements across a wide composition range. We then extract static (radial distribution functions, coordination numbers distributions) and dynamic (cage correlation functions) quantities from the simulations. Then, we discuss the interplay between the microscopic structure of the molten salts and their dynamic properties. It is often considered that variations in the diffusion coefficient of the anions are mainly driven by the evolution of its coordination with the metallic ion (Y3+ here). We compare this system with fluorozirconate melts and demonstrate that the coordination number is a poor indicator of the evolution of the diffusion coefficient. Instead, we propose to use the ionic bonds lifetime. We show that the weak Y-F ionic bonds in LiF-YF3 do not induce the expected tendency of the fluoride diffusion coefficient to converge toward one of the yttrium cation when the content in YF3 increases. Implications on the validity of the Nernst-Einstein relation for estimating the electrical conductivity are discussed.

  13. ??Yttrium-hydroxyapatite: a new therapeutic option for radioactive synovectomy in haemophilic synovitis.

    PubMed

    Thomas, S; Gabriel, M C; de Souza, S A L; Gomes, S C; Assi, P E; Pinheiro Perri, M L; Liberato, W; Matushita, C S; Gutfilen, B; da Fonseca, L M B

    2011-09-01

    Recurrent haemarthroses often lead to chronic synovitis in patients with haemophilia and von Willebrand disease. Radioactive synovectomy with yttrium-90 (??Y) citrate is frequently used to treat this complication, usually with good results. Since 2006, the Nuclear Energy Research Institute (IPEN, Sao Paulo, Brazil) has produced hydroxyapatite particles labelled with ??Y for radioactive synovectomy. The aim of this study was to compare the results achieved by both forms of ??Y in the treatment of haemophilic synovitis. We included 221 joints from 136 patients (age range: 6-20 years), treated by one of the two radiopharmaceuticals, at the Hemocenter of Mato Grosso, Brazil. The outcomes analysed were the annual frequency of haemarthrosis, articular pain and joint range of motion before and 1 year after RS. Similar results were achieved regardless of whether ??Y hydroxyapatite or ??Y citrate was used, and results were independent of the joint type, age, gender, radiologic stage and presence of inhibitors. ??Y hydroxyapatite appears to be equivalent to the reference product ??Y citrate in the treatment of chronic synovitis associated with bleeding disorders. PMID:21388489

  14. Modification of c-axis sapphire implanted with high dose yttrium ions

    NASA Astrophysics Data System (ADS)

    Xie, Dong-zhu; Zhu, De-zhang; Cao, De-xin; Cao, Jian-qing; Pan, Hao-chang; Xu, Hong-jie

    1999-01-01

    Single crystalline samples of <0 0 0 1> ?-Al 2O 3 were implanted with 171 keV yttrium ions to high doses of 1 × 10 17 and 9 × 10 17 ions/cm 2 at room temperature (RT) and then isothermally annealed at temperatures ranging from 500°C to 1050°C in air. The lattice damage in sapphire induced by ion irradiation and the thermal annealing behavior were analyzed using Rutherford Backscattering Spectrometry and Channeling (RBS-C) and X-ray diffraction (XRD). The microhardness of the implanted surface layers was also measured by use of a Vickers microhardness tester before and after annealing. For the 1 × 10 17 ions/cm 2 as-implanted sample an amorphous layer with a width of about 50 nm was observed. After annealing at 900°C in air for 10 h, RBS-C measurements show that the amorphous layer recrystallized epitaxially about 9.3 nm, and XRD results indicate the formation of YAl precipitates with <0 0 2> preferred orientation with respect to <0 0 0 1> of the substrate. For specimens implanted with 9 × 10 17 ions/cm 2, the degradation of microhardness in the near surface layer is roughly linear with annealing temperature, and the XRD measurements reveal the formation of YAl 3 precipitates.

  15. Interaction of yttrium with nickel and phosphorus: Phase diagram and structural chemistry

    NASA Astrophysics Data System (ADS)

    Zhak, Olga; Stoyko, Stanislav; Babizhetskyy, Volodymyr; Shved, Olena; Oryshchyn, Stepan; Hoch, Constantin

    2013-11-01

    The interaction between the components of the ternary Y-Ni-P system has been investigated by means of electron probe microanalysis, X-ray phase and structure analyses, and the isothermal section of the phase diagram at 1070 K has been constructed for the first time. Existence of the earlier reported eight ternary phosphides of yttrium and nickel was confirmed, among them seven ternaries are daltonide compounds: YNi4P2 (ZrFe4Si2-type structure), Y2Ni12P7 (Zr2Fe12P7-type structure), Y6Ni20P13 (Zr6Ni20P13-type structure), Y6Ni14.9P10.18 (own structure type), Y20Ni42P30.34 (Sm20Ni41.6P30-type structure), Y15Ni28P21 (Tb15Ni28P21-type structure), and YNiP (Tb1-xNiP-type structure), whereas YNi1.66-1.78P2 (ThCr2Si2-type structure) is a berthollide compound with small homogeneity range. The crystal structures of the some ternary phosphides have been determined by X-ray powder diffraction (YNi4P2 and YNi1.66-1.78P2) and single crystal diffraction (Y2Ni12P7) techniques.

  16. Right Gastric Artery Embolization Prior to Treatment with Yttrium-90 Microspheres

    SciTech Connect

    Cosin, Octavio; Bilbao, Jose Ignacio [Clinica Universitaria de Navarra, Departamento de Radiologia (Spain)], E-mail: jibilbao@unav.es; Alvarez, Sergio [Hospital Pablo Tobon Uribe, Servicio de Radiologia (Colombia); Luis, Esther de; Alonso, Alberto; Martinez-Cuesta, Antonio [Clinica Universitaria de Navarra, Departamento de Radiologia (Spain)

    2007-02-15

    Purpose. Intra-arterial infusion of yttrium-90 microspheres is a form of radiation treatment for unresectable hepatic neoplasms. Misdeposition of particles in the gastroduodenal area such as the right gastric artery (RGA) may occur with serious consequences. We present a series of patients who underwent a detailed vascular study followed by RGA embolization. Special emphasis is placed on anatomic variations and technical considerations .Methods. In a 1 year period, 27 patients were treated. Initial vascular evaluation was performed, with careful attention to anatomic variants or extrahepatic arterial supply, especially to the gastroduodenal area. Embolization of such arteries was planned if needed. RGA embolization was performed antegradely from the hepatic artery or retrogradely via the left gastric artery (LGA). Postprocedural follow-up included clinical interview and gastroscopy if necessary. Results. RGA embolization was performed in 9 patients presenting with primary (n = 3) or metastatic liver tumors (n 6). Six patients underwent antegrade RGA embolization and 3 had embolization done retrogradely via the LGA. Retrograde access was chosen for anatomic reasons. None of the patients complained of gastroduodenal symptoms. Conclusion. RGA embolization can help minimize the gastroduodenal deposition of radioactive particles. RGA embolization should routinely be carried out. The procedure can be performed, with similar technical success, by both anterograde and retrograde approaches.

  17. Structure and dynamics in yttrium-based molten rare earth alkali fluorides

    E-print Network

    Maximilien Levesque; Vincent Sarou-Kanian; Mathieu Salanne; Mallory Gobet; Henri Groult; Catherine Bessada; Paul A. Madden; Anne-Laure Rollet

    2013-05-13

    The transport properties of molten LiF-YF3 mixtures have been studied by pulsed field gradient nuclear magnetic resonance spectroscopy, potentiometric experiments, and molecular dynamics simulations. The calculated diffusion coefficients and electric conductivities compare very well with the measurements accross a wide composition range. We then extract static (radial distribution functions, coordination numbers distributions) and dynamic (cage correlation functions) quantities from the simulations. Then, we discuss the interplay between the microscopic structure of the molten salts and their dynamic properties. It is often considered that variations in the diffusion coefficient of the anions are mainly driven by the evolution of its coordination with the metallic ion (Y3+ here). We compare this system with fluorozirconate melts and demonstrate that the coordination number is a poor indicator of the evolution of the diffusion coefficient. Instead, we propose to use the ionic bonds lifetime. We show that the weak Y-F ionic bonds in LiF-YF3 do not induce the expected tendency of the fluoride diffusion coefficient to converge toward the one of yttrium cation when the content in YF3 increases. Implications on the validity of the Nernst-Einstein relation for estimating the electrical conductivity are discussed.

  18. 40 CFR 141.88 - Monitoring requirements for lead and copper in source water.

    Code of Federal Regulations, 2014 CFR

    2014-07-01

    ...requirements for lead and copper in source water. 141.88 Section 141.88 Protection...ENVIRONMENTAL PROTECTION AGENCY (CONTINUED) WATER PROGRAMS (CONTINUED) NATIONAL PRIMARY DRINKING WATER REGULATIONS Control of Lead and Copper...

  19. 40 CFR 141.88 - Monitoring requirements for lead and copper in source water.

    Code of Federal Regulations, 2010 CFR

    2010-07-01

    ...requirements for lead and copper in source water. 141.88 Section 141.88 Protection...ENVIRONMENTAL PROTECTION AGENCY (CONTINUED) WATER PROGRAMS (CONTINUED) NATIONAL PRIMARY DRINKING WATER REGULATIONS Control of Lead and Copper...

  20. 40 CFR 141.88 - Monitoring requirements for lead and copper in source water.

    Code of Federal Regulations, 2012 CFR

    2012-07-01

    ...requirements for lead and copper in source water. 141.88 Section 141.88 Protection...ENVIRONMENTAL PROTECTION AGENCY (CONTINUED) WATER PROGRAMS (CONTINUED) NATIONAL PRIMARY DRINKING WATER REGULATIONS Control of Lead and Copper...

  1. 40 CFR 141.88 - Monitoring requirements for lead and copper in source water.

    Code of Federal Regulations, 2011 CFR

    2011-07-01

    ...requirements for lead and copper in source water. 141.88 Section 141.88 Protection...ENVIRONMENTAL PROTECTION AGENCY (CONTINUED) WATER PROGRAMS (CONTINUED) NATIONAL PRIMARY DRINKING WATER REGULATIONS Control of Lead and Copper...

  2. 40 CFR 141.88 - Monitoring requirements for lead and copper in source water.

    Code of Federal Regulations, 2013 CFR

    2013-07-01

    ...requirements for lead and copper in source water. 141.88 Section 141.88 Protection...ENVIRONMENTAL PROTECTION AGENCY (CONTINUED) WATER PROGRAMS (CONTINUED) NATIONAL PRIMARY DRINKING WATER REGULATIONS Control of Lead and Copper...

  3. 42 CFR 88.13 - WTC Program Administrator's certification of health conditions.

    Code of Federal Regulations, 2012 CFR

    2012-10-01

    ...certification of health conditions. 88.13 Section 88.13 Public Health PUBLIC HEALTH SERVICE, DEPARTMENT OF HEALTH AND HUMAN SERVICES OCCUPATIONAL SAFETY AND HEALTH RESEARCH AND RELATED ACTIVITIES WORLD TRADE CENTER HEALTH PROGRAM §...

  4. 42 CFR 88.13 - WTC Program Administrator's certification of health conditions.

    Code of Federal Regulations, 2014 CFR

    2014-10-01

    ...certification of health conditions. 88.13 Section 88.13 Public Health PUBLIC HEALTH SERVICE, DEPARTMENT OF HEALTH AND HUMAN SERVICES OCCUPATIONAL SAFETY AND HEALTH RESEARCH AND RELATED ACTIVITIES WORLD TRADE CENTER HEALTH PROGRAM §...

  5. 21 CFR 520.88g - Amoxicillin trihydrate and clavulanate potassium film-coated tablets.

    Code of Federal Regulations, 2011 CFR

    2011-04-01

    ...trihydrate and clavulanate potassium film-coated tablets. 520.88g Section 520.88g Food and...trihydrate and clavulanate potassium film-coated tablets. (a) Specifications. Each tablet contains amoxicillin trihydrate and...

  6. 21 CFR 520.88g - Amoxicillin trihydrate and clavulanate potassium film-coated tablets.

    Code of Federal Regulations, 2010 CFR

    2010-04-01

    ...trihydrate and clavulanate potassium film-coated tablets. 520.88g Section 520.88g Food and...trihydrate and clavulanate potassium film-coated tablets. (a) Specifications. Each tablet contains amoxicillin trihydrate and...

  7. On Target

    NSDL National Science Digital Library

    WGBH

    2010-01-01

    In this design challenge activity, learners modify a cup so it can carry a marble down a zip line and also drop it onto a target. Learners are encouraged to brainstorm answers to design questions, build a prototype using simple materials, and test, evaluate, and redesign their structure. The activity guide includes troubleshooting tips. The related Leader's Notes guide contains information on how to connect this to NASA and aerospace engineering.

  8. Mucus clearance, MyD88-dependent and MyD88-independent immunity modulate lung susceptibility to spontaneous bacterial infection and inflammation

    PubMed Central

    Livraghi-Butrico, Alessandra; Kelly, E. Jane; Klem, Erich R.; Dang, Hong; Wolfgang, Matthew C.; Boucher, Richard C.; Randell, Scott H.; O’Neal, Wanda K.

    2012-01-01

    It has been postulated that mucus stasis is central to the pathogenesis of obstructive lung diseases. In Scnn1b-transgenic (Scnn1b-Tg+) mice, airway-targeted overexpression of the epithelial Na+ channel ? subunit causes airway surface dehydration, which results in mucus stasis and inflammation. Bronchoalveolar lavage from neonatal Scnn1b-Tg+ mice, but not wild-type littermates, contained increased mucus, bacteria, and neutrophils, which declined with age. Scnn1b-Tg+ mice lung bacterial flora included environmental and oropharyngeal species, suggesting inhalation and/or aspiration as routes of entry. Genetic deletion of the Toll/Interleukin-1 receptor adapter molecule MyD88 in Scnn1b-Tg+ mice did not modify airway mucus obstruction, but caused defective neutrophil recruitment and increased bacterial infection, which persisted into adulthood. Scnn1b-Tg+ mice derived into germ-free conditions exhibited mucus obstruction similar to conventional Scnn1b-Tg+ mice and sterile inflammation. Collectively, these data suggest that dehydration-induced mucus stasis promotes infection, compounds defects in other immune mechanisms, and alone is sufficient to trigger airway inflammation. PMID:22419116

  9. Molecular cloning and expression studies of the adapter molecule myeloid differentiation factor 88 (MyD88) in turbot (Scophthalmus maximus).

    PubMed

    Lin, Jing-Yun; Hu, Guo-Bin; Yu, Chang-Hong; Li, Song; Liu, Qiu-Ming; Zhang, Shi-Cui

    2015-10-01

    Myeloid differentiation factor 88 (MyD88) is an adapter protein involved in the interleukin-1 receptor (IL-1R) and Toll-like receptor (TLR)-mediated activation of nuclear factor-kappaB (NF-?B). In this study, a full length cDNA of MyD88 was cloned from turbot, Scophthalmus maximus. It is 1619 bp in length and contains an 858-bp open reading frame that encodes a peptide of 285 amino acid residues. The putative turbot (Sm)MyD88 protein possesses a N-terminal death domain and a C-terminal Toll/IL-1 receptor (TIR) domain known to be important for the functions of MyD88 in mammals. Phylogenetic analysis grouped SmMyD88 with other fish MyD88s. SmMyD88 mRNA was ubiquitously expressed in all examined tissues of healthy turbots, with higher levels observed in immune-relevant organs. To explore the role of SmMyD88, its gene expression profile in response to stimulation of lipopolysaccharide (LPS), CpG oligodeoxynucleotide (CpG-ODN) or turbot reddish body iridovirus (TRBIV) was studied in the head kidney, spleen, gills and muscle over a 7-day time course. The results showed an up-regulation of SmMyD88 transcript levels by the three immunostimulants in all four examined tissues, with the induction by CpG-ODN strongest and initiated earliest and inducibility in the muscle very weak. Additionally, TRBIV challenge resulted in a quite high level of SmMyD88 expression in the spleen, whereas the two synthetic immunostimulants induced the higher levels in the head kidney. These data provide insights into the roles of SmMyD88 in the TLR/IL-1R signaling pathway of the innate immune system in turbot. PMID:26025195

  10. One-step synthesis of layered yttrium hydroxides in immiscible liquid–liquid systems: Intercalation of sterically-bulky hydrophobic organic anions and doping of europium ions

    SciTech Connect

    Watanabe, Mebae; Fujihara, Shinobu, E-mail: shinobu@applc.keio.ac.jp

    2014-02-15

    Inorganic–organic layered rare-earth compounds were synthesized on the basis of a biphasic liquid–liquid system in one pot. Layered yttrium hydroxides (LYHs) were chosen as a host material for the intercalation of hydrophobic organic guest anions such as benzoate, sebacate, or laurate. In a typical synthesis, an organic phase dissolving carboxylic acid was placed in contact with an equal amount of an aqueous phase dissolving yttrium nitrate n-hydrate and urea. At elevated temperatures up to 80 °C, urea was hydrolyzed to release hydroxyl anions which were used to form yttrium hydroxide layers. LYHs were then precipitated with the intercalation of carboxylate anions delivered from the organic phase under the distribution law. The structure and the morphology of the LYHs could be modulated by the intercalated anions. Doped with Eu{sup 3+} ions, the LYHs exhibited red photoluminescence which was enhanced by the intercalated anions due to the antenna effect. - Graphical abstract: The Eu{sup 3+}-doped layered yttrium hydroxide exhibits intense red photoluminescence after intercalation of benzoate ions. Display Omitted - Highlights: • Immiscible biphasic liquid systems were introduced to synthesize layered yttrium hydroxides. • The temperature of the biphasic systems does not exceed 80 °C in one step of the synthesis. • Hydrophobic organic anions were intercalated between the hydroxide layers in one pot. • Structure and morphology of the hydroxides were modulated by changing the kind of organic anions. • Eu{sup 3+}-doping led to red luminescence from the hydroxides in association with the intercalated organic anions.

  11. UCDHS PeopleSoft HRMS 8.8 [Employee Self Service Applying for Jobs

    E-print Network

    Leistikow, Bruce N.

    UCDHS PeopleSoft HRMS 8.8 [Employee Self Service ­ Applying for Jobs] 8.8 Employee SS - Applying for Jobs V4.0 1/31/2007 Employee User Guide Applying for Jobs #12;UCDHS PeopleSoft HRMS 8.8 ­ Employee Self Service ­ Applying for Jobs 8.8 Employee SS - Applying for Jobs V4.0 Page 2 of 16 1/31/2007 View Job

  12. A comparative study of pressure-dependent emission characteristics in different gas plasmas induced by nanosecond and picosecond neodymium-doped yttrium aluminum garnet (Nd:YAG) lasers.

    PubMed

    Abdulmadjid, Syahrun Nur; Idris, Nasrullah; Marpaung, Alion Mangasi; Pardede, Marincan; Jobiliong, Eric; Hedwig, Rinda; Suliyanti, Maria Margaretha; Ramli, Muliadi; Suyanto, Heri; Kagawa, Kiichiro; Tjia, May On; Lie, Zener Sukra; Lie, Tjung Jie; Kurniawan, Hendrik Koo

    2013-11-01

    An experimental study has been performed on the pressure-dependent plasma emission intensities in Ar, He, and N2 surrounding gases with the plasma induced by either nanosecond (ns) or picosecond (ps) yttrium aluminum garnet laser. The study focused on emission lines of light elements such as H, C, O, and a moderately heavy element of Ca from an agate target. The result shows widely different pressure effects among the different emission lines, which further vary with the surrounding gases used and also with the different ablation laser employed. It was found that most of the maximum emission intensities can be achieved in Ar gas plasma generated by ps laser at low gas pressure of around 5 Torr. This experimental condition is particularly useful for spectrochemical analysis of light elements such as H, C, and O, which are known to suffer from intensity diminution at higher gas pressures. Further measurements of the spatial distribution and time profiles of the emission intensities of H I 656.2 nm and Ca II 396.8 nm reveal the similar role of shock wave excitation for the emission in both ns and ps laser-induced plasmas, while an additional early spike is observed in the plasma generated by the ps laser. The suggested preference of Ar surrounding gas and ps laser was further demonstrated by outperforming the ns laser in their applications to depth profiling of the H emission intensity and offering the prospect for the development of three-dimensional analysis of a light element such as H and C. PMID:24160880

  13. 88. Overhead view of clear air station site at early ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    88. Overhead view of clear air station site at early stage of construction. View is from south 30 degrees west showing DR 3 in foreground with DR 2 in middle and DR 1 out of view. Official photograph BMEWS Project by unknown photographer, 5 October, 1959, Photographic Services, Riverton, NJ, BMEWS, clear as negative no. A-27. - Clear Air Force Station, Ballistic Missile Early Warning System Site II, One mile west of mile marker 293.5 on Parks Highway, 5 miles southwest of Anderson, Anderson, Denali Borough, AK

  14. Water-resources activities, South Carolina District, 1987-88

    USGS Publications Warehouse

    Stringfield, W.J.

    1989-01-01

    The South Carolina District, of the U.S. Geological Survey 's Water Resources Division, conducts data collection and interpretative investigations of the water resources of South Carolina. These studies address water-resource related problems in South Carolina that are of National, State, and local interest. This report provides information on investigations in progress in the District during fiscal years 1987-88. The bibliography lists the publications that have been written as a result of South Carolina District studies and studies pertaining to South Carolina that were conducted in other offices of the U.S. Geological Survey. (USGS)

  15. 42 CFR 412.88 - Additional payment for new medical service or technology.

    Code of Federal Regulations, 2012 CFR

    2012-10-01

    ...Additional payment for new medical service or technology. 412.88 Section 412.88 Public...Cases, Special Treatment Payment for New Technology, and Payment Adjustment for Certain...Additional Special Payment for Certain New Technology § 412.88 Additional payment...

  16. 42 CFR 412.88 - Additional payment for new medical service or technology.

    Code of Federal Regulations, 2010 CFR

    2010-10-01

    ...Additional payment for new medical service or technology. 412.88 Section 412.88 Public...Cases, Special Treatment Payment for New Technology, and Payment Adjustment for Certain...Additional Special Payment for Certain New Technology § 412.88 Additional payment...

  17. 42 CFR 412.88 - Additional payment for new medical service or technology.

    Code of Federal Regulations, 2014 CFR

    2014-10-01

    ...Additional payment for new medical service or technology. 412.88 Section 412.88 Public...Cases, Special Treatment Payment for New Technology, and Payment Adjustment for Certain...Additional Special Payment for Certain New Technology § 412.88 Additional payment...

  18. 42 CFR 412.88 - Additional payment for new medical service or technology.

    Code of Federal Regulations, 2013 CFR

    2013-10-01

    ...Additional payment for new medical service or technology. 412.88 Section 412.88 Public...Cases, Special Treatment Payment for New Technology, and Payment Adjustment for Certain...Additional Special Payment for Certain New Technology § 412.88 Additional payment...

  19. 42 CFR 412.88 - Additional payment for new medical service or technology.

    Code of Federal Regulations, 2011 CFR

    2011-10-01

    ...Additional payment for new medical service or technology. 412.88 Section 412.88 Public...Cases, Special Treatment Payment for New Technology, and Payment Adjustment for Certain...Additional Special Payment for Certain New Technology § 412.88 Additional payment...

  20. De novo expression of circulating biglycan evokes an innate inflammatory tissue response via MyD88/TRIF pathways.

    PubMed

    Zeng-Brouwers, Jinyang; Beckmann, Janet; Nastase, Madalina-Viviana; Iozzo, Renato V; Schaefer, Liliana

    2014-04-01

    Matrix-bound constituents, such as the small leucine-rich proteoglycan biglycan, can act as powerful signaling molecules when released by limited proteolysis of the extracellular matrix or de novo synthesized by macrophages in the circulation and body fluids. Specifically, biglycan acts as an endogenous ligand of innate immunity by directly engaging the Toll-like receptor (TLR)-2 and -4. In this study, we generated a transient transgenic mouse model where biglycan was de novo overproduced by hepatocytes driven by the albumin promoter. Transgenic biglycan was rapidly and abundantly synthesized by hepatocytes and released into the bloodstream. Notably, we found that circulating biglycan accumulated in the kidneys where it caused recruitment of leukocytes infiltrating the renal parenchyma concurrent with abnormal renal levels of chemoattractants CXCL1, CXCL2, CCL2 and CCL5. Using mice deficient in either TLR adapter proteins MyD88 or TRIF we discovered that MyD88 deficiency drastically reduced neutrophil and macrophage infiltration in the kidney, whereas TRIF deficiency decreased T cell infiltrates. Production of CXCL1, CXCL2 and CCL2 required MyD88, whereas the levels of T cell and macrophage attractant CCL5 required TRIF. Thus, we provide robust genetic evidence for circulating biglycan as a powerful pro-inflammatory mediator targeting the renal parenchyma. Furthermore, our results provide the first evidence that biglycan differentially triggers chemoattraction of leukocytes via two independent pathways, both under the control of TLR2/4, utilizing either MyD88 or TRIF adaptor proteins. As aberrant expression of biglycan occurs in several inflammatory diseases, this transient transgenic mouse model could serve as a valuable research tool in investigating the effects of increased biglycan expression in vivo and for the development of therapeutic strategies in the treatment of inflammatory diseases. PMID:24361484