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Sample records for vodoroda po zadannomu

  1. po_stack_movie

    DEFF Research Database (Denmark)

    2009-01-01

    po_stack® er et reolsystem, hvis enkle elementer giver stor flexibilitet, variation og skulpturel virkning. Elementerne stables og forskydes frit, så reolens rum kan vendes til begge sider, være åbne eller lukkede og farvekombineres ubegrænset. Reolen kan let ombygges, udvides eller opdeles, når ...

  2. KPr(PO34

    Directory of Open Access Journals (Sweden)

    Abdelghani Oudahmane

    2010-08-01

    Full Text Available Single crystals of the title compound, potassium praseodymium(III polyphosphate, were obtained by solid-state reaction. The monoclinic non-centrosymmetric structure is isotypic with all other KLn(PO34 analogues from Ln = La to Er, inclusive. The crystal structure of these long-chain polyphosphates is built up from infinite crenelated polyphosphate chains of corner-sharing PO4 tetrahedra with a repeating unit of four tetrahedra. These chains, running along [100], are arranged in a pseudo-tetragonal rod packing and are further linked by isolated PrO8 square antiprisms [Pr—O = 2.3787 (9–2.5091 (8 Å], forming a three-dimensional framework. The K+ ions reside in channels parallel to [010] and exhibit a highly distorted coordination sphere by eight O atoms at distances ranging from 2.7908 (9 to 3.1924 (11 Å.

  3. Lo poético

    Directory of Open Access Journals (Sweden)

    Josep Sou

    2014-03-01

    Full Text Available Tal vez podamos considerar «lo poético» como un concepto neutralizado, es decir, que va más allá de la referencia al hecho poético exclusivo. Lo poético define, también, un ámbito o atmósfera que inunda los espacios ajenos a la poesía: pintura, música, escultura, cine, etc., toman de la poesía ese aspecto que los acercan, por elevación, hacia las coordenadas poéticas propiamente dichas. Tal vez se trate de la utilización de un epíteto no pertinente, aunque en el uso común la fascinación delicada de la percepción se confunde con los rasgos propios de la poesía.

  4. LiDy(PO34

    Directory of Open Access Journals (Sweden)

    Fathia Chehimi-Moumen

    2008-07-01

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

  5. LiHo(PO34

    Directory of Open Access Journals (Sweden)

    Mokhtar Férid

    2009-02-01

    Full Text Available Lithium holmium(III polyphosphate(V, LiHo(PO34, belongs to the type I of polyphosphates with general formula ALn(PO34, where A is a monovalent cation and Ln is a trivalent rare earth cation. In the crystal structure, the polyphosphate chains spread along the b-axis direction, with a repeat period of four tetrahedra and 21 internal symmetry. The Li and Ho atoms are both located on twofold rotation axes and are surrounded by four and eight O atoms, leading to a distorted tetrahedral and dodecahedral coordination, respectively. The HoO8 polyhedra are isolated from each other, the closest Ho...Ho distance being 5.570 (1 Å.

  6. Superconducting Coil of Po Dipole

    CERN Multimedia

    1983-01-01

    The Po superconducting dipole was built as a prototype beam transport magnet for the SPS extracted proton beam P0. Its main features were: coil aperture 72 mm, length 5 m, room-temperature yoke, NbTi cable conductor impregnated with solder, nominal field 4.2 T at 4.7 K (87% of critical field). It reached its nominal field without any quench.After this successful test up to its nominal field of 4.2 T, the power was not raised to reach a quench. The magnet was not installed in a beam and had no other further use. Nevertheless its construction provided knowledges and experience which became useful in the design and construction of the LHC magnets. The photo shows a detail of the inner layer winding before superposing the outer layer to form the complete coil of a pole. Worth noticing is the interleaved glass-epoxy sheet (white) with grooved channels for the flow of cooling helium. See also 8211532X.

  7. Aspects on the analysis of 210Po

    DEFF Research Database (Denmark)

    Henricsson, F.; Ranebo, Y.; Holm, E.

    2011-01-01

    , no radiochemical yield determinant was used and it was generally supposed that the yield was 100% after two depositions. Counting was often done using ZnS scintillation counter coupled to a photomultiplier tube. However, the use of the yield determinants 208Po and 209Po and the development of alpha spectrometry...... and the waiting time between deposition and measurement of the sample. A further consequence of this is that in the assessment of the 210Pb content in the sample, very often the remaining liquid is stored after deposition for build-up of 210Po. Since some 210Pb is lost on the disc, the result for 210Pb...

  8. Aspects on the analysis of 210Po.

    Science.gov (United States)

    Henricsson, F; Ranebo, Y; Holm, E; Roos, P

    2011-05-01

    There has been little development regarding analysis of polonium (Po) in environmental samples since the 1960 ies. This is due to the straightforward spontaneous deposition of this element on silver (Ag), nickel (Ni) or copper (Cu) without any radiochemical separation. For many years, no radiochemical yield determinant was used and it was generally supposed that the yield was 100% after two depositions. Counting was often done using ZnS scintillation counter coupled to a photomultiplier tube. However, the use of the yield determinants (208)Po and (209)Po and the development of alpha spectrometry showed that the yield was lower. Furthermore, the tendency of Po to volatilize at low temperatures constrains the sample preparation techniques; dry-ashing cannot be used. But during the wet-ashing procedure, there are still some losses. The aim of this study was to evaluate the Po losses during wet-ashing by the use of a double-tracer technique. We have found that the losses were about 30% when open glass beakers were used and about 17% when the samples were digested in microwave oven. When long-necked bottles (Kjeldahl flasks) were used, a loss of about 20% was registered. It has also been observed that (210)Pb to some extent is plating out together with its daughter nuclide Po during the electrochemical deposition. This will result in a systematic error since an unknown amount of supported (210)Po will be produced from the (210)Pb decay depending on the fraction of (210)Pb being deposited on the disc and the waiting time between deposition and measurement of the sample. A further consequence of this is that in the assessment of the (210)Pb content in the sample, very often the remaining liquid is stored after deposition for build-up of (210)Po. Since some (210)Pb is lost on the disc, the result for (210)Pb will be too low. Both these systematic errors give rise to a too high (210)Po/(210)Pb ratio. The fraction of (210)Pb which is plating out has been assessed in this

  9. El lenguaje poético

    Directory of Open Access Journals (Sweden)

    Alfonso Hanssen

    1966-03-01

    Full Text Available Me parece absurdo pretender hallar la intención poética en cualesquiera rastros de la historia, por el solo hecho de que en ellos se afirma cierta reconditez que los hace misteriosos.

  10. Obravnava pacientke po lepotni operacije dojke

    OpenAIRE

    Lesnika, Bernarda

    2009-01-01

    Glavna tema diplomskega dela je obravnava pacientke po lepotni operaciji dojke, kateri je bil z operativnim posegom vstavljen vsadek. Za kakovostno zdravstveno nego mora medicinska sestra poznati anatomijo in fiziologijo dojke ter vedeti, kako ženske sprejemajo svoje telo in zakaj se za ta poseg odločajo. Prvi del diplomskega dela je namenjen prav temu. Sledi osrednji del diplomskega dela, kjer je navedenih nekaj negovalnih problemov, s katerimi se medicinske sestre srečujejo po lepotni opera...

  11. L’invention poétique ou l’invention du poème

    Directory of Open Access Journals (Sweden)

    Frédéric Marteau

    2013-11-01

    Full Text Available Que signifie inventer en poésie ? En quoi un poème serait-il l’objet d’une invention ? De Joachim du Bellay à Francis Ponge, on s’efforce de tirer un fil dans l’histoire de la poésie où l’invention poétique, en général, devient l’invention d’un poème en particulier : l’invention d’un objet au sein d’un genre lui-même toujours à inventer. On s’intéresse ainsi au fonctionnement du poème et au principe de sa mise en marche, un fonctionnement organique où le lecteur joue un rôle essentiel de déclencheur, d’« agent commutateur » comme le dit Ponge. Dès lors, la poésie n’apparaît plus seulement comme un art du faire, elle est également toute entière tournée vers son à-venir que soutient et que rend possible toute lecture ; aussi son invention (son invenire est-elle toujours cet avoir-lieu qui n’a jamais lieu, elle est ce qui arrive au poème et fait de lui l’objet de cet avènement que réactive chaque lecture.

  12. Radioactive {sup 210}Po in magnesium supplements

    Energy Technology Data Exchange (ETDEWEB)

    Struminska-Parulska, Dagmara Ida [Gdansk Univ. (Poland). Environmental Chemistry and Radiochemistry Chair

    2016-08-01

    The aim of this pioneer study was to determine polonium {sup 210}Po in the most popular magnesium supplements in Poland and estimate the possible related dose assessment to the consumers. The analyzed magnesium pharmaceutics contained organic or inorganic magnesium compounds; some from natural sources. The objectives of this research were to investigate the naturally occurring {sup 210}Po activity concentrations in magnesium supplements, find the correlations between {sup 210}Po concentration in medicament and magnesium chemical form, and calculate the effective radiation dose connected to analyzed magnesium supplement consumption. The highest {sup 210}Po activity concentrations were determined in mineral tablets made from sedimentary rocks, namely dolomite - 3.84 ± 0.15 mBq g{sup -1} (sample Mg17). The highest annual radiation dose from {sup 210}Po taken with 1 tablet of magnesium supplement per day or with 400 mg of pure Mg daily would come from sample Mg17 (dolomite) - 1.35 ± 0.5 and 8.44 ± 0.33 μSv year{sup -1} respectively.

  13. Una poética del pliegue

    Directory of Open Access Journals (Sweden)

    Ana Porrúa

    2001-11-01

    Full Text Available La producción de Juan Gelman-de Violín y otras cuestiones a Relaciones- puede inscribirse dentro de la poética sesentista caracterizada por la hegemonía de la narración y la apertura del discurso poético al resto de los discursos sociales, pero también establece una compleja relación con las vanguardias históricas. La noción de pliegue permite revisar las articulaciones de este conflicto; como espacio el pliegue separa ambas poéticas, la "coloquialista" y vanguardista, que pueden leerse en el interior del corpus propuesto en estado puro, yuxtapuestas, o bajo la forma del cruce que instala la polémica entre libros o textos de un mismo libro. La idea depliegue como rasgo operatorio permite, por su parte, revisar la relación entre ambas poéticas en el interior de un poema, focalizando la materia, el lenguaje. En este caso la poética vanguardista funciona como cuestionamiento de la linealidad del texto sesentista.

  14. Una poética del pliegue

    Directory of Open Access Journals (Sweden)

    Ana Porrúa

    2000-11-01

    Full Text Available La producción de Juan Gelman-de Violín y otras cuestiones a Relaciones- puede inscribirse dentro de la poética sesentista caracterizada por la hegemonía de la narración y la apertura del discurso poético al resto de los discursos sociales, pero también establece una compleja relación con las vanguardias históricas. La noción de pliegue permite revisar las articulaciones de este conflicto; como espacio el pliegue separa ambas poéticas, la "coloquialista" y vanguardista, que pueden leerse en el interior del corpus propuesto en estado puro, yuxtapuestas, o bajo la forma del cruce que instala la polémica entre libros o textos de un mismo libro. La idea depliegue como rasgo operatorio permite, por su parte, revisar la relación entre ambas poéticas en el interior de un poema, focalizando la materia, el lenguaje. En este caso la poética vanguardista funciona como cuestionamiento de la linealidad del texto sesentista.

  15. PO2 Cycling Reduces Diaphragm Fatigue by Attenuating ROS Formation

    Science.gov (United States)

    Zuo, Li; Diaz, Philip T.; Chien, Michael T.; Roberts, William J.; Kishek, Juliana; Best, Thomas M.; Wagner, Peter D.

    2014-01-01

    Prolonged muscle exposure to low PO2 conditions may cause oxidative stress resulting in severe muscular injuries. We hypothesize that PO2 cycling preconditioning, which involves brief cycles of diaphragmatic muscle exposure to a low oxygen level (40 Torr) followed by a high oxygen level (550 Torr), can reduce intracellular reactive oxygen species (ROS) as well as attenuate muscle fatigue in mouse diaphragm under low PO2. Accordingly, dihydrofluorescein (a fluorescent probe) was used to monitor muscular ROS production in real time with confocal microscopy during a lower PO2 condition. In the control group with no PO2 cycling, intracellular ROS formation did not appear during the first 15 min of the low PO2 period. However, after 20 min of low PO2, ROS levels increased significantly by ∼30% compared to baseline, and this increase continued until the end of the 30 min low PO2 condition. Conversely, muscles treated with PO2 cycling showed a complete absence of enhanced fluorescence emission throughout the entire low PO2 period. Furthermore, PO2 cycling-treated diaphragm exhibited increased fatigue resistance during prolonged low PO2 period compared to control. Thus, our data suggest that PO2 cycling mitigates diaphragm fatigue during prolonged low PO2. Although the exact mechanism for this protection remains to be elucidated, it is likely that through limiting excessive ROS levels, PO2 cycling initiates ROS-related antioxidant defenses. PMID:25299212

  16. RbCuFe(PO42

    Directory of Open Access Journals (Sweden)

    Mongi Ben Amara

    2013-08-01

    Full Text Available A new iron phosphate, rubidium copper(II iron(III bis(phosphate, RbCuFe(PO42, has been synthesized as single crystals by the flux method. This compound is isostructural with KCuFe(PO42 [Badri et al. (2011, J. Solid State Chem. 184, 937–944]. Its structure is built up from Cu2O8 units of edge-sharing CuO5 polyhedra, interconnected by FeO6 octahedra through common corners to form undulating chains that extend infinitely along the [011] and [01-1] directions. The linkage of such chains is ensured by the PO4 tetraedra and the resulting three-dimensional framework forms quasi-elliptic tunnels parallel to the [101] direction in which the Rb+ cations are located.

  17. doped LiMgPO4 phosphor

    Indian Academy of Sciences (India)

    Optically stimulated luminescence (OSL) is a well- established technique in personal and medical dosimetry, ... first suggested for personal dosimetry in 1950s. Further, it was spurred by introduction of a method .... product in sample. The LiMgPO4 phosphor was orthorhombic, with the space group Pnma with a about twice.

  18. Electronic Properties of LiFePO4 and Li doped LiFePO4

    Energy Technology Data Exchange (ETDEWEB)

    Zhuang, G.V.; Allen, J.L.; Ross, P.N.; Guo, J.-H.; Jow, T.R.

    2005-06-28

    The potential use of different iron phosphates as cathodematerials in lithium-ion batteries has recently been investigated.1 Oneof the promising candidates is LiFePO4. This compound has severaladvantages in comparison to the state-of-the-art cathode material incommercial rechargeable lithium batteries. Firstly, it has a hightheoretical capacity (170 mAh/g). Secondly, it occurs as mineraltriphylite in nature and is inexpensive, thermally stable, non-toxic andnon-hygroscopic. However, its low electronic conductivity (~;10-9 S/cm)results in low power capability. There has been intense worldwideresearch activity to find methods to increase the electronic conductivityof LiFePO4, including supervalent ion doping,2 introducingnon-carbonaceous network conduction3 and carbon coating, and theoptimization of the carbon coating on LiFePO4 particle surfaces.4Recently, the Li doped LiFePO4 (Li1+xFe1-xPO4) synthesized at ARL hasyield electronic conductivity increase up to 106.5 We studied electronicstructure of LiFePO4 and Li doped LiFePO4 by synchrotron based soft X-rayemission (XES) and X-ray absorption (XAS) spectroscopies. XAS probes theunoccupied partial density of states, while XES the occupied partialdensity of states. By combining XAS and XES measurements, we obtainedinformation on band gap and orbital character of both LiFePO4 and Lidoped LiFePO4. The occupied and unoccupied oxygen partial density ofstates (DOS) of LiFePO4 and 5 percent Li doped LiFePO4 are presented inFig. 1. Our experimental results clearly indicate that LiFePO4 has wideband gap (~; 4 eV). This value is much larger than what is predicted byDFT calculation. For 5 percent Li doped LiFePO4, a new doping state wascreated closer to the Fermi level, imparting p-type conductivity,consistent with thermopower measurement. Such observation substantiatesthe suggestion that high electronic conductivity in Li1.05Fe0.95 PO4 isdue to available number of charge carriers in the material. Furthermore,Hall effect

  19. Lifetime measurements of 214Po and 212Po with the CTF liquid scintillator detector at LNGS

    Energy Technology Data Exchange (ETDEWEB)

    Bellini, G.; Benziger, J.; Bick, D.; Bonfini, G.; Bravo, D.; Buizza Avanzini, M.; Caccianiga, B.; Cadonati, L.; Calaprice, F.; Carraro, C.; Cavalcante, P.; Chavarria, A.; Chepurnov, A.; Chubakov, V.; D’Angelo, D.; Davini, S.; Derbin, A.; Etenko, A.; Fomenko, K.; Franco, D.; Galbiati, C.; Gazzana, S.; Ghiano, C.; Giammarchi, M.; Göger-Neff, M.; Goretti, A.; Grandi, L.; Guardincerri, E.; Hardy, S.; Ianni, Aldo; Ianni, Andrea; Kobychev, V.; Korablev, D.; Korga, G.; Koshio, Y.; Kryn, D.; Laubenstein, M.; Lewke, T.; Lissia, Marcello; Litvinovich, E.; Loer, B.; Lombardi, F.; Lombardi, P.; Ludhova, L.; Machulin, I.; Manecki, S.; Maneschg, W.; Manuzio, G.; Meindl, Q.; Meroni, E.; Miramonti, L.; Misiaszek, M.; Montanari, D.; Mosteiro, P.; Mantovani, F.; Muratova, V.; Nisi, S.; Oberauer, L.; Obolensky, M.; Ortica, F.; Otis, K.; Pallavicini, M.; Papp, L.; Perasso, L.; Perasso, S.; Pocar, A.; Ranucci, G.; Razeto, A.; Re, A.; Romani, A.; Rossi, N.; Sabelnikov, A.; Saldanha, R.; Salvo, C.; Schönert, S.; Simgen, H.; Skorokhvatov, M.; Smirnov, O.; Sotnikov, A.; Sukhotin, S.; Suvorov, Y.; Tartaglia, R.; Testera, G.; Vogelaar, R. B.; von Feilitzsch, F.; Winter, J.; Wojcik, M.; Wright, A.; Wurm, M.; Xhixha, G.; Xu, J.; Zaimidoroga, O.; Zavatarelli, S.; Zuzel, G.

    2013-07-01

    We have studied the alpha decays of 214Po into 210Pb and of 212Po into 208Pb tagged by the coincidence with the preceding beta decays from 214Bi and 212Bi, respectively. The employed 222Rn, 232Th, and 220Rn sources were sealed inside quartz vials and inserted in the Counting Test Facility at the underground Gran Sasso National Laboratory in Italy. We find that the mean lifetime of 214Po is (236.00 +- 0.42(stat) +- 0.15(syst)) \\mu s and that of 212Po is (425.1 +- 0.9(stat) +- 1.2(syst)) ns. Our results, obtained from data with signal-to-background ratio larger than 1000, reduce the overall uncertainties and are compatible with previous measurements.

  20. Le corps poétique ou la poétique du corps

    Directory of Open Access Journals (Sweden)

    Yvonne Goga

    2007-05-01

    Full Text Available Les réflexions sur la poésie de Valéry sont illustrées dans deux volumes : Album de vers anciens et Charmes. Parmi les images les plus représentatives est celle du corps de la femme. Par l’analyse des images sur le corps de la femme, le but de notre étude est celui de souligner l’un des principes de la poétique de Valéry : la relation entre le monde extérieur, le corps et l’esprit, pour créer le poème et le poète.

  1. Tentative de suicide poétique de la voix poématique nerudienne

    Directory of Open Access Journals (Sweden)

    Dominique Casimiro

    2010-02-01

    Full Text Available La souffrance nérudienne, fondamentale dans la trajectoire poétique du poète chilien, est la traduction et l’entreprise improbable d’une survie poétique: de cette même douleur naîtra un chant poétique sonore et total. Paradoxe ultime, le dialogue avec les morts de la Guerre civile espagnole (1936-1939, eux aussi souffrants, puis avec les voix disparues des anciens indiens (dans le Chant général permettra au sujet nérudien d’accepter la part mortelle qui est en lui, mais également d’aller plus avant dans le son et la transparence. Source de création poétique et de révolution esthétique, la souffrance conduit à la création d’une voix et d’une langue poétiques nouvelles pour dire toute la vie et toutes les morts de l’homme universel.

  2. Physical Oceanography Distributed Active Archive Center (PO.DAAC)

    Data.gov (United States)

    National Aeronautics and Space Administration — PO.DAAC is an element of the Earth Observing System Data Information System (EOSDIS). PO.DAAC's primary responsibility is to provide distribution and archive support...

  3. Lithium samarium polyphosphate, LiSm(PO34

    Directory of Open Access Journals (Sweden)

    Dan Zhao

    2010-02-01

    Full Text Available The mixed-metal rare-earth polyphosphate LiSm(PO34 consists of a three-dimensional framework in which zigzag [(PO3n]n− chains with a periodicity of four PO4 tetrahedra are connected through Li+ and Sm3+ ions (both with 2. symmetry.

  4. The BiPo-3 detector.

    Science.gov (United States)

    Loaiza, P; Barabash, A S; Basharina-Freshville, A; Birdsall, E; Blondel, S; Blot, S; Bongrand, M; Boursette, D; Brudanin, V; Busto, J; Caffrey, A J; Calvez, S; Cascella, M; Cerna, C; Chauveau, E; Chopra, A; Capua, S De; Duchesneau, D; Durand, D; Egorov, V; Eurin, G; Evans, J J; Fajt, L; Filosofov, D; Flack, R; Garrido, X; Gómez, H; Guillon, B; Guzowski, P; Holý, K; Hodák, R; Huber, A; Hugon, C; Jeremie, A; Jullian, S; Kauer, M; Klimenko, A; Kochetov, O; Konovalov, S I; Kovalenko, V; Lang, K; Lemière, Y; Noblet, T Le; Liptak, Z; Liu, X R; Lutter, G; Macko, M; Mamedov, F; Marquet, C; Mauger, F; Morgan, B; Mott, J; Nemchenok, I; Nomachi, M; Nova, F; Ohsumi, H; Oliviéro, G; Pahlka, R B; Pater, J; Perrot, F; Piquemal, F; Povinec, P; Přidal, P; Ramachers, Y A; Remoto, A; Richards, B; Riddle, C L; Rukhadze, E; Saakyan, R; Sarazin, X; Shitov, Yu; Simard, L; Šimkovic, F; Smetana, A; Smolek, K; Smolnikov, A; Söldner-Rembold, S; Soulé, B; Štekl, I; Thomas, J; Timkin, V; Torre, S; Tretyak, Vl I; Tretyak, V I; Umatov, V I; Vilela, C; Vorobel, V; Waters, D; Žukauskas, A

    2017-05-01

    The BiPo-3 detector is a low radioactive detector dedicated to measuring ultra-low natural contaminations of 208 Tl and 214 Bi in thin materials, initially developed to measure the radiopurity of the double β decay source foils of the SuperNEMO experiment at the μBq/kg level. The BiPo-3 technique consists in installing the foil of interest between two thin ultra-radiopure scintillators coupled to low radioactive photomultipliers. The design and performances of the detector are presented. In this paper, the final results of the 208 Tl and 214 Bi activity measurements of the first enriched 82 Se foils are reported for the first time, showing the capability of the detector to reach sensitivities in the range of some μBq/kg. Copyright © 2017 Elsevier Ltd. All rights reserved.

  5. Forenzika elektronske pošte

    Directory of Open Access Journals (Sweden)

    Milorad S. Markagić

    2013-10-01

    Full Text Available U najopštijem smislu digitalna forenzika može se definisati kao skup metoda za prikupljanje, analizu i prezentaciju digitalnih dokaza koji se mogu pronaći na računarima, serverima, u računarskim mrežama, bazama podataka, mobilnim uređajima i svim drugim elektronskim uređajima na kojima se čuvaju podaci. U ovom radu su opisane metode prikupljanja digitalnih dokaza u elektronskoj pošti i njihova analiza. Uvod Elektronska pošta se kao dokazni materijal pojavljuje u velikom broju kako građanskih tako i kriminalnih forenzičkih istraga. Elektronska pošta i elektronska pošta zasnovana na internet serverima  širi se veoma brzo, pa lako i brzo završi i na računaru korisnika kome nije namenjena. Prvu elektronsku poruku poslao je Ray Tomilson 1971. godine, a deset godina kasnije u kombinaciji sa personalnim računarima i internetom prerasta u globalni način komuniciranja i personalnog i poslovnog. Takođe se koristi i u svrhu zabave, načina razmene podataka, ali predstavlja i nezamenjiv izvor digitalnih dokaza, kada dodje do računarskog incidenta. Analiza elektronske pošte Svaka elektronska poruka sastoji se od dva dela: zaglavlja i teksta poruke. Iz zaglavlja je moguće saznati izvorišnu i odredišnu adresu, pošiljaoca i namenjenog primaoca, a telo poruke sadrži tekst poruke. Ekstenzije dokumenata elektronske pošte U slučajevima kada je potrebno otkriti samo dokumente potrebne za pregled elektronskih poruka, ili kopirati pojedinačni dokument sačuvan unutar elektronske pošte, moguće je koristiti sistem na istraživanom računaru ili specijalizovani softver kao što je Outlook Extract Pro ili Outlook Export. Mnogo ispravniji, sigurniji i jednostavniji način je korišćenje forenzičkih alata kao što su EnCase ili FTK, sa ugrađenim pregledačima koji omogućavaju pregled i snimanje sadržaja baze podataka kao i njihovo kopiranje na druge medije za dalju analizu. Forenzički alati automatizuju proces skidanja i kopiranja

  6. Temporal changes of {sup 210}Po in temperate coastal waters

    Energy Technology Data Exchange (ETDEWEB)

    Wildgust, M.A.; White, K.N. [School of Biological Sciences, The University of Manchester, Manchester (United Kingdom); McDonald, P. [Westlakes Research Limited, Westlakes Science and Technology Park, Cumbria (United Kingdom)

    1998-06-18

    The temporal variation of Polonium-210 ({sup 210}Po) was examined in coastal sea water, the mussel Mytilus edulis, the winkle Littorina littorea and green algae Ulva lactuca in order to investigate the entry of {sup 210}Po into the marine food chain. More than 99% of {sup 210}Po in the water column occurred in the particulate phase. Dissolved {sup 210}Po concentrations peaked during the spring phytoplankton bloom and it is suggested this is related to preferential scavenging of {sup 210}Po by the increased numbers of bacteria, viruses and small dissolved particulates. Changes in L. Littorea {sup 210}Po specific activity are thought not to be related to food, but to a drop in body weight following spawning. Much of the {sup 210}Po accumulated by M. edulis was located in the digestive gland. The specific activity of {sup 210}Po in the digestive gland of M. edulis was shown to be strongly correlated with changes in sea water suspended particulate specific activity. Examination of other trace metal (Ag, Al, As, Ca, Cd, Cr, Co, Cu, Fe, Hg, K, Mg, Mn, Na, Ni Sb, Se, Sn and Zn) variations in the digestive gland revealed that class B and borderline metals had a strong positive correlation with {sup 210}Po. On-going work is investigating whether the accumulation and loss of {sup 210}Po is affected by the presence of metallothioneins

  7. Sodium samarium tetrakis(polyphosphate, NaSm(PO34

    Directory of Open Access Journals (Sweden)

    Dan Zhao

    2010-07-01

    Full Text Available NaSm(PO34 has been prepared by solid state reactions. It belongs to type II of the structural family of MILnIII(PO34 compounds (MI = alkali metal and LnIII = rare earth metal and is composed of ∞(PO3n]n− polyphosphate chains with a repeating unit of four PO4 tetrahedra. The chains extend parallel to [100] and share O atoms with irregular SmO8 polyhedra, forming a three-dimensional framework which delimits tunnels occupied by Na+ cations in a distorted octahedral environment.

  8. Behaviour of 210Po in the marine environment

    Science.gov (United States)

    Wildgust, Mark Antony

    The naturally occurring alpha-emitter polonium-210 (210Po) is one of the most radiotoxic elements in the environment. Moreover, it contributes more than 150 times towards the effective radiation dosage received by humans from the consumption of fish and shellfish than from anthropogenic 137Cs. Polonium-210 is known to be strongly accumulated by marine organisms but its biochemistry is poorly understood. The research described here had two main aims: first, to investigate the factors causing temporal variations of 210Po in the temperate coastal waters and marine biota and second, to examine the biokinetics of 210Po in the marine mussel Mytilus edulis. These questions were investigated by a field study and a series of laboratory experiments. In the field study more than 99% of 210Po in the water column occurred in the particulate phase. Dissolved 210Po levels peaked during the phytoplankton bloom and I proposed that this was related to preferential scavenging of 210Po by increased numbers of bacteria, viruses and small dissolved particulates. Changes in 210Po specific activity in the winkle Liittorina littorea are thought to be related to a fall in body weight following spawning. The specific activity of 210Po in the digestive gland of M. edulis was strongly correlated with changes in seawater suspended particulate specific activity. Examination of other trace metals revealed correlations between class B and Borderline metals. In the laboratory digestion of 210Po-labelled Isochrysis galbana occurred via a biphasic process, characteristic of a rapid (extracellular) and slow (intracellular) digestion typical of marine bivalves. The mantle/gill and foot have no known digestive role, yet their 210Po specific activities increased after 24 hours. I proposed that this increase in 210Po specific activity was related to 210Po incorporated into these tissues from that assimilated from I. galbana during extracellular digestion. I also propose that the linear loss of 210Po

  9. Le poète Robert Creeley

    Directory of Open Access Journals (Sweden)

    Barbara Montefalcone

    2006-03-01

    Full Text Available R. Creeley, lecture au « Rose Art Museum » (Brandeis University, Boston, 17 novembre 2004. Cette lecture avait été organisée pour célébrer la dernière collaboration entre Creeley et Clemente, Tandori Satori and Commonplace (les tableaux en arrière‑plan sont de Clemente. ©Barbara Montefalcone, 2005Air’s way,fire’s home,water’swon again.Ma belle,heart’speacepassesinto earth.THE ENDLe 30 mars à l’aube, Robert Creeley, une des voix majeures de la poésie américaine depuis les années 1950, s’est ...

  10. Separation and electrodeposited of {sup 210} Po; Separacion y electrodeposito de {sup 210} Po

    Energy Technology Data Exchange (ETDEWEB)

    Ordonez R, E.; Iturbe G, J.L

    1991-12-15

    Presently work it was determined the selective separation of the {sup 210} Po that is in an uraniferous mineral, by means of acid leaching of the mineral and the purification was carried out by means of partition chromatography whose stationary phase is 2-ethylhexyl phosphoric acid (D{sub 2}EHPA), it has been possible to isolate the {sup 210} Po of the rest of the radioactive elements that conform the family 4 N{sup +2}, the optimal elutriation conditions of this element were settled down of manner of not dragging other radioelements. Another of the achievements presented in this communication has been the electrodeposition of this element has more than enough stainless steel discs with a superior yield to 95%. (Author)

  11. Degradation Studies on LiFePO4 cathode

    DEFF Research Database (Denmark)

    Scipioni, Roberto; Jørgensen, Peter Stanley; Hjelm, Johan

    2015-01-01

    In this paper we examine a laboratory LiFePO4 (LFP) cathode and propose a simple model that predicts the electrode capacity as function of C-rate, number of cycles and calendar time. Microcracks were found in Li1-xFePO4 particles in a degraded LFP electrode and low-acceleration voltage (1 kV) FIB...

  12. Przestrzeń pożydowska

    Directory of Open Access Journals (Sweden)

    Konrad Matyjaszek

    2014-06-01

    Full Text Available The Post-Jewish Space The paper offers a critical analysis of a prevalently used contemporary Polish design strategy of alteration and modification, practiced on the former Jewish districts in Poland. A majority of these districts’ urban substance consists of property once belonging to Polish Jews, and appropriated by non-Jewish Poles during the Holocaust and after 1945. Such property and its urban space are described in Polish language as a ‘post-Jewish’ ones (mienie pożydowskie. The article analyses two parallel cultural processes of contemporary adaptation of this urban space. First of these processes is focused on the concept of Jewish Space, a social idea proposed in 1999 by Diana Pinto. The Jewish Space, envisaged as a cultural and material space of an encounter between European Jews and non-Jews, in its Polish interpretation becomes free from any requirement of a Jewish presence. A social practice resulting from such interpretation differs radically from Pinto’s original idea. The second reviewed process concerns the physical construction of thus defined ‘space of encounter’. Its practice is analysed on an example of Oxygenator, an urban intervention by Joanna Rajkowska, installed in Warsaw in 2007. This work, one of first Polish attempts to create a physical space of encounter, despite of its altruistic principles could not fully go beyond the boundaries of the Polish discourse on the exclusivist ‘dialogue’. Consequently, a cultural vocabulary it allowed remains limited to meanings more likely to result with exclusion than with a possibility of participation.   Przestrzeń pożydowska Artykuł zawiera krytyczną analizę współczesnych strategii zmian oraz modyfikacji w pożydowskich dzielnicach w Polsce. Większość substancji miejskiej w tych rejonach składa się z nieruchomości wcześniej należących do polskich Żydów, a później przywłaszczonych przez Polaków nieżydowskiego pochodzenia podczas

  13. K2Ho(PO4(WO4

    Directory of Open Access Journals (Sweden)

    Katherina V. Terebilenko

    2008-11-01

    Full Text Available A new compound, dipotassium holmium(III phosphate(V tungstate(VI, K2Ho(PO4(WO4, has been obtained during investigation of the K2O–P2O5–WO3–HoF3 phase system using the flux technique. The compound is isotypic with K2Bi(PO4(WO4. Its framework structure consists of flat ∞2[HoPO4] layers parallel to (100 that are made up of ∞1[HoO8] zigzag chains interlinked via slightly distorted PO4 tetrahedra. WO4 tetrahedra are attached above and below these layers, leaving space for the K+ counter-cations. The HoO8, PO4 and WO4 units exhibit 2 symmetry.

  14. Effect of Phosphate Salts (Na3PO4, Na2HPO4, and NaH2PO4) on Ag3PO4 Morphology for Photocatalytic Dye Degradation under Visible Light and Toxicity of the Degraded Dye Products

    NARCIS (Netherlands)

    Amornpitoksuk, P; Intarasuwan, K; Suwanboon, S; Baltrusaitis, Jonas

    2013-01-01

    Ag3PO4 was synthesized by the precipitation method using three different types of phosphate salts (Na3PO4, Na2HPO4, and NaH2PO4) as a precipitating agent. Hydrolysis of each phosphate salt gave a specific pH that affected the purity and morphology of the prepared Ag3PO4. The Ag3PO4 prepared from

  15. 210Po in the human food chain; El 210Po en la cadena alimenticia humana

    Energy Technology Data Exchange (ETDEWEB)

    Diaz-Frances, I.

    2010-07-01

    210 Po is a natural ocurring radionuclide, belonging to the Uranium series, which is present in minute amounts in the different environmental compartments (water, soil, biota) and that through its route along the trophic chain can finish incorporated in the human body via ingestion of waters and or food. This radionucleid is highly radiotoxic, being one of the main contributors to the committed effective dose received by the population of Seville via consumption of bottled waters and via ingestion of typical diets is evaluated. The mentioned contribution is also compared with the contributions of other natural and and artificial radionuclides. (Author). 23 refs.

  16. Spirit Pluralisme dalam Klenteng Sam Po Kong Semarang

    Directory of Open Access Journals (Sweden)

    Edi Nurwahyu Julianto

    2015-07-01

    Full Text Available Klenteng Sam Po Kong has very deep meaning as a symbol of multi cultural; multi ethnic and multi religious. Klenteng Sam Po Kong has a different function, not only used by people with background religious Tri Dharma (Budha, Tao and Konghuchu, but also used by Javanese ethnic with different religious backgrounds. Between ethnic China and Java, mutual respect and tolerance run beliefs and rituals of each. More over, Klenteng Sam Po Kong is a form of pluralism which reflected the fact Sino Javanese Muslim Culture is preserved to date both of sightings physical culture and system cultural in the form of religious rites performed by ethnic China and Java.

  17. Prediction of Wind Energy Resources (PoWER) Users Guide

    Science.gov (United States)

    2016-01-01

    ARL-TR-7573● JAN 2016 US Army Research Laboratory Prediction of Wind Energy Resources ( PoWER ) User’s Guide by David P Sauter...not return it to the originator. ARL-TR-7573 ● JAN 2016 US Army Research Laboratory Prediction of Wind Energy Resources ( PoWER ...2016 2. REPORT TYPE Final 3. DATES COVERED (From - To) 09/2015–11/2015 4. TITLE AND SUBTITLE Prediction of Wind Energy Resources ( PoWER ) User’s

  18. Cs2Bi(PO4(WO4

    Directory of Open Access Journals (Sweden)

    Kateryna V. Terebilenko

    2009-09-01

    Full Text Available Dicaesium bismuth(III phosphate(V tungstate(VI, Cs2Bi(PO4(WO4, has been synthesized during complex investigation in a molten pseudo-quaternary Cs2O–Bi2O3–P2O5–WO3 system. It is isotypic with K2Bi(PO4(WO4. The three-dimensional framework is built up from [Bi(PO4(WO4] nets, which are organized by adhesion of [BiPO4] layers and [WO4] tetrahedra above and below of those layers. The interstitial space is occupied by Cs atoms. Bi, W and P atoms lie on crystallographic twofold axes.

  19. Electroweak Higgs production with HiggsPO at NLO QCD

    Science.gov (United States)

    Greljo, Admir; Isidori, Gino; Lindert, Jonas M.; Marzocca, David; Zhang, Hantian

    2017-12-01

    We present the HiggsPO UFO model for Monte Carlo event generation of electroweak VH and VBF Higgs production processes at NLO in QCD in the formalism of Higgs pseudo-observables (PO). We illustrate the use of this tool by studying the QCD corrections, matched to a parton shower, for several benchmark points in the Higgs PO parameter space. We find that, while being sizable and thus important to be considered in realistic experimental analyses, the QCD higher-order corrections largely factorize. As an additional finding, based on the NLO results, we advocate to consider 2D distributions of the two-jet azimuthal-angle difference and the leading jet p_T for new physics searches in VBF Higgs production. The HiggsPO UFO model is publicly available.

  20. Lifetime measurements of {sup 214}Po and {sup 212}Po with the CTF liquid scintillator detector at LNGS

    Energy Technology Data Exchange (ETDEWEB)

    Bellini, G.; Buizza Avanzini, M.; Caccianiga, B.; D' Angelo, D.; Giammarchi, M.; Lombardi, P.; Ludhova, L.; Meroni, E.; Miramonti, L.; Perasso, L.; Ranucci, G.; Re, A. [Universita Milano (Italy); INFN, Dipartimento di Fisica, Milano (Italy); Benziger, J. [Princeton University, Chemical Engineering Department, Princeton, NJ (United States); Bick, D. [Universitaet Hamburg, Institut fuer Experimentalphysik, Hamburg (Germany); Bonfini, G.; Cavalcante, P.; Gazzana, S.; Ghiano, C.; Ianni, Aldo; Korga, G.; Koshio, Y.; Laubenstein, M.; Lombardi, F.; Nisi, S.; Razeto, A.; Rossi, N.; Tartaglia, R. [INFN, Laboratori Nazionali del Gran Sasso, Assergi (Italy); Bravo, D.; Hardy, S.; Manecki, S.; Vogelaar, R.B. [Virginia Polytechnic Institute and State University, Physics Department, Blacksburg, VA (United States); Cadonati, L.; Otis, K.; Pocar, A. [University of Massachusetts, Physics Department, Amherst, MA (United States); Calaprice, F.; Chavarria, A.; Galbiati, C.; Goretti, A.; Grandi, L.; Ianni, Andrea; Loer, B.; Mosteiro, P.; Saldanha, R.; Wright, A.; Xu, J. [Princeton University, Physics Department, Princeton, NJ (United States); Carraro, C.; Davini, S.; Guardincerri, E.; Manuzio, G.; Pallavicini, M.; Perasso, S.; Salvo, C.; Testera, G.; Zavatarelli, S. [Universita Genova (Italy); INFN, Dipartimento di Fisica, Genova (Italy); Chepurnov, A. [Lomonosov Moscow State University, Institute of Nuclear Physics, Moscow (Russian Federation); Chubakov, V.; Mantovani, F.; Xhixha, G. [Universita Ferrara (Italy); INFN, Dipartimento di Fisica, Ferrara (Italy); Derbin, A.; Muratova, V. [St. Petersburg Nuclear Physics Institute, Gatchina (Russian Federation); Etenko, A.; Litvinovich, E.; Machulin, I.; Sabelnikov, A.; Skorokhvatov, M.; Sukhotin, S. [NRC Kurchatov Institute, Moscow (Russian Federation); Fomenko, K. [INFN, Laboratori Nazionali del Gran Sasso, Assergi (Italy); Joint Institute for Nuclear Research, Dubna (Russian Federation); Franco, D.; Kryn, D.; Obolensky, M. [Obs de Paris, Sorbonne, APC, Univ. Paris Diderot, CNRS/IN2P3, CEA/Irfu, Paris Cite (France); Goeger-Neff, M.; Lewke, T.; Meindl, Q.; Oberauer, L.; Feilitzsch, F. von; Winter, J.; Wurm, M. [Technische Universitaet Muenchen, Physik Department, Garching (Germany); Kobychev, V. [Kiev Institute for Nuclear Research, Kiev (Ukraine); Korablev, D.; Smirnov, O.; Sotnikov, A.; Zaimidoroga, O. [Joint Institute for Nuclear Research, Dubna (Russian Federation); Lissia, Marcello [INFN, Sezione di Cagliari, Monserrato (Italy); Maneschg, W.; Simgen, H. [Max-Plank-Institut fuer Kernphysik, Heidelberg (Germany); Misiaszek, M.; Wojcik, M. [Jagiellonian University, M. Smoluchowski Institute of Physics, Krakow (Poland); Montanari, D. [Fermi National Accelerator Laboratory, Batavia, IL (United States); Ortica, F.; Romani, A. [Universita Perugia (Italy); INFN, Dipartimento di Chimica, Perugia (Italy); Papp, L. [INFN, Laboratori Nazionali del Gran Sasso, Assergi (Italy); Virginia Polytechnic Institute and State University, Physics Department, Blacksburg, VA (United States); Schoenert, S. [Technische Universitaet Muenchen, Physik Department, Garching (Germany); Max-Plank-Institut fuer Kernphysik, Heidelberg (Germany); Suvorov, Y. [INFN, Laboratori Nazionali del Gran Sasso, Assergi (Italy); NRC Kurchatov Institute, Moscow (Russian Federation); Zuzel, G. [Max-Plank-Institut fuer Kernphysik, Heidelberg (Germany); Jagiellonian University, M. Smoluchowski Institute of Physics, Krakow (Poland); Collaboration: Borexino Collaboration

    2013-07-15

    We have studied the {alpha}-decays of {sup 214}Po into {sup 210}Pb and of {sup 212}Po into {sup 208}Pb tagged by the coincidence with the preceding {beta}-decays from {sup 214}Bi and {sup 212}Bi, respectively. The {sup 222}Rn, {sup 232}Th, and {sup 220}Rn sources used were sealed inside quartz vials and inserted in the Counting Test Facility at the underground Gran Sasso National Laboratory in Italy. We find that the mean lifetime of {sup 214}Po is (236.00 {+-} 0.42(stat) {+-} 0.15(syst)) {mu}s and that of {sup 212}Po is (425.1 {+-} 0.9(stat) {+-} 1.2(syst)) ns. Our results, obtained from data with signal-to-background ratio larger than 1000, reduce the overall uncertainties and are compatible with previous measurements. (orig.)

  1. Order-Disorder Model of PO_4-Dipoles for KH_2PO_4 Type Ferroelectric Phase Transition

    OpenAIRE

    Masaharu, TOKUNAGA; Research Institute of Applied Electricity, Hokkaido University

    1985-01-01

    An order-disorder model of PO4 dipoles is presented from a new viewpoint on the mechanism of phase transition in KH2PO4 type hydrogen-bonded crystals. This model is based on recent experimental results of light scattering and has been confirmed also by recent Raman spectroscopic studies. The relation of this model to conventional proton order-disorder models is discussed in connection with the magnitude of the transition entropy and the ice constraint.

  2. PoV-GAME: PUNTOS DE VISTA MEDIANTE JUEGOS PoV-GAME: VIEWPOINTS THROUGH GAMES

    Directory of Open Access Journals (Sweden)

    Carlos Zapata-Jaramillo

    2012-06-01

    Full Text Available El desarrollo de proyectos de software considera importante la consistencia entre la información entregada por todos los interesados de una aplicación. En otras palabras, se procura llegar a acuerdos entre los diferentes puntos de vista de cada actor y llevarlos a cabo durante todo el proyecto. Con los métodos de enseñanza tradicionales se procura formar habilidades en este campo, pero no se afianzan mediante la práctica que, generalmente, se emplea para el aprendizaje en este campo. Por ello, en este artículo se propone ''PoV-GAME'', una nueva forma de ''jugar aprendiendo'', la cual busca fortalecer algunos conceptos básicos en la ingeniería de software como la consistencia en la información que se maneja a lo largo de un proyecto y afianzar la importancia de los puntos de vista en el desarrollo de un producto de software. Posteriormente, se analizan los resultados obtenidos luego de realizar el juego en diferentes grupos de estudiantes.Information for software applications is delivered by the stakeholders. Software development projects need consistency as an important aspect of such information. In other words, agreement among the different viewpoints must be reached in order to be implemented in the project. Well-known teaching methods try to create capabilities in this field, but they fail in reinforcing them in practice, which is commonly used for teaching in this field. Therefore, in this paper we propose ''PoV GAME'' a new way of ''play-to-learn''. We aim the reinforcement of some basic concepts about software engineering such as consistency in the information handled throughout the project, and the importance of viewpoints in the software product development. Subsequently, we analyze the results obtained after holding the game in several groups of students.

  3. Natural levels of {sup 210}Po in human urine

    Energy Technology Data Exchange (ETDEWEB)

    Diaz-Frances, I.; Manjon, G.; Mantero, J.; Diaz, J. [Departament of Applied Phisic II, University of Seville, P.O. Box 41012 Seville (Spain); Garcia-Tenorio, R. [Departament of Applied Phisic II, University of Seville, P.O. Box 41012 Seville (Spain); National Accelerator Centre, P.O. Box 41092 Seville (Spain)

    2014-07-01

    Since the secret agent Alexander Litvinenko was murdered in 2006 by a {sup 210}Po lethal dose, presumably ingested, there is renovated interest on the toxicity of this radionuclide in humans. {sup 210}Po is a radioactive isotope naturally found in nature, mainly incorporated by humans via food and water ingestion, as well as inhaled through its progenitor, the {sup 222}Rn. The total amount of natural {sup 210}Po in the human body can vary from person to person depending on their lifestyle: dietary habits, drinking water source, place of residence (associated with exposure to {sup 222}Rn), etc- and therefore in the concentrations of this element to be found in urine. To analyze the influence of dietary habits on the amount of {sup 210}Po excreted in urine, two volunteers in Seville had a well-defined and time-varying diet for a month, following a daily collection of their urine and determination of the concentrations therein of this radionuclide. The results obtained and the conclusions derived from them form the core of this communication. {sup 210}Po determinations were performed daily in 200 ml aliquots of urine using the technique of high resolution alpha spectrometry. This has involved the application of a single radiochemical method for the concentration and isolation {sup 210}Po, followed by its auto-deposition on copper planchets for proper measure. Daily {sup 210}Po activity concentrations in voluntary urine analyzed during the month of study show high variability with a difference of up to an order of magnitude between maximum and minimum values obtained, and a clear dependence on the diet type followed in the various stages of the experiment. The lowest concentrations obtained are associated with a diet rich in carbohydrates and proteins 'terrestrial' (pork, beef,...), while the highest concentrations were obtained in the final phase of the experiment when the diet was enriched with presence of marine products in fair correspondence with the

  4. Jean Aicard et les Poèmes de Provence. Lecture rhétorique du poème liminaire

    Directory of Open Access Journals (Sweden)

    Michèle Gorenc

    2003-09-01

    Full Text Available Insistant sur l’influence de l’art oratoire sur l’œuvre poétique de Jean Aicard, l’article propose une lecture rhétorique du poème liminaire de son recueil Poèmes de Provence.

  5. {sup 210}Pb and {sup 210}Po in Finnish cereals

    Energy Technology Data Exchange (ETDEWEB)

    Turtiainen, Tuukka, E-mail: tuukka.turtiainen@stuk.f [STUK, Radiation and Nuclear Safety Authority, P.O. Box 14, 00881 Helsinki (Finland); Kostiainen, Eila, E-mail: eila.kostiainen@stuk.f [STUK, Radiation and Nuclear Safety Authority, P.O. Box 14, 00881 Helsinki (Finland); Hallikainen, Anja, E-mail: anja.hallikainen@evira.f [Finnish Food Safety Authority Evira, Mustialankatu 3, 00790 Helsinki (Finland)

    2011-05-15

    A survey was carried out on the activity concentrations of {sup 210}Pb and {sup 210}Po in cereal grains produced in Finland. The cereal species were wheat (Triticum aestivum), rye (Secale cereale), oats (Avena sativa) and barley (Hordeum vulgare), which account for 90% of the Finnish consumption of cereal products. The survey consisted of 18 flour and 13 unprocessed cereal samples and one hulled grain sample from 22 flour mills. According to the results, the mean {sup 210}Pb/{sup 210}Po concentrations in wheat grains, wheat flour, rye flour, oat grains and barley grains were 0.29, 0.12, 0.29, 0.36 and 0.36 Bq kg{sup -1}, respectively. Combined with the consumption rates of the products, we assess that the mean effective doses from {sup 210}Pb and {sup 210}Po in cereal products for the adult male and female population are 22 and 17 {mu}Sv per year, respectively.

  6. Behavior of Po-210 in molten Pb-17Li

    Energy Technology Data Exchange (ETDEWEB)

    Feuerstein, H.; Oschinski, J.; Horn, S. (Kernforschungszentrum Karlsruhe GmbH (Germany). Hauptabt. Ingenieurtechnik)

    1992-09-01

    The behavior of Po-210 in molten Pb-17Li was investigated in evaporation experiments. It was found that polonium evaporates in form of an intermetallic compound PbPo. Because of the low vapor pressure of this polonide, evaporation rates are small. The activity coefficient for Po in Pb-17Li is given by 1n [gamma] = -4.77-(1329/T). Under conditions of a fusion reactor blanket with helium as cover gas, the evaporating fraction will be 10[sup 6] times smaller than that estimated assuming ideal solution and vacuum. In agreement with observations at a Bi-inpile loop, only a very small fraction of the total polonium will be found in cover gas spaces. (orig.).

  7. Co3(PO42·4H2O

    Directory of Open Access Journals (Sweden)

    Yang Kim

    2008-10-01

    Full Text Available Single crystals of Co3(PO42·4H2O, tricobalt(II bis[orthophosphate(V] tetrahydrate, were obtained under hydrothermal conditions. The title compound is isotypic with its zinc analogue Zn3(PO42·4H2O (mineral name hopeite and contains two independent Co2+ cations. One Co2+ cation exhibits a slightly distorted tetrahedral coordination, while the second, located on a mirror plane, has a distorted octahedral coordination environment. The tetrahedrally coordinated Co2+ is bonded to four O atoms of four PO43− anions, whereas the six-coordinate Co2+ is cis-bonded to two phosphate groups and to four O atoms of four water molecules (two of which are located on mirror planes, forming a framework structure. In addition, hydrogen bonds of the type O—H...O are present throughout the crystal structure.

  8. Po-210 and other radionuclides in terrestrial and freshwater environments

    Energy Technology Data Exchange (ETDEWEB)

    Gjelsvik, Runhild; Brown, Justin (eds.) (Norwegian Radiation Protection Authority (Norway)); Holm, Elis (Univ. of Lund (Sweden)); Roos, Per (Risoe DTU (Denmark)); Saxen, Ritva; Outola, Iisa (STUK - Radiation and Nuclear Safety Authority (Finland))

    2009-01-15

    This report provides new information on Po-210 (and where appropriate its grandparent Pb-210) behaviour in environmental systems including humans. This has primarily been achieved through measurements of Po-210 in aquatic and terrestrial environments that has led to the derivation of information on the levels of this radioisotope in plants, animals and the biotic components of their habitat (i.e. water, soil) providing basic information on transfer where practicable. For freshwater environments, Po-210 concentration ratios derived for freshwater benthic fish and bivalve mollusc were substantially different to values collated from earlier review work. For terrestrial environments, activity concentrations of Po-210 in small mammals (although of a preliminary nature because no correction was made for ingrowth from Pb-210) were considerably higher than values derived from earlier data compilations. It was envisaged that data on levels of naturally occurring radionuclides would render underpinning data sets more comprehensive and would thus allow more robust background dose calculations to be performed subsequently. By way of example, unweighted background dose-rates arising from internal distributions of Po-210 were calculated for small mammals in the terrestrial study. The biokinetics of polonium in humans has been studied following chronic and acute oral intakes of selected Po radioisotopes. This work has provided information on gastrointestinal absorption factors and biological retention times thus improving the database upon which committed effective doses to humans are derived. The information generated in the report, in its entirety, should be of direct relevance for both human and non-human impact assessments. (au)

  9. La solitude du poète touareg

    OpenAIRE

    Casajus, Dominique

    2004-01-01

    International audience; L'article traite de la poésie touarègue contemporaine, des sentiments qu'elle exprime ou qu'elle suscite, des voies par lesquelles elle se transmet. Il a paru dans les Actes d'un colloque tenu à l'Université libre de Bruxelles en 2001, et dédié aux variations du sentiment triste dans les musiques du monde et les poésies ou chansons populaires. Les styles de musique abordés étaient, entre autres, le blues, le fado, le flamenco, le tango, etc. Le trouble provoqué par cet...

  10. PRAVICE KUPCA GLEDE ISTOVETNOSTI BLAGA PO OZ IN DUNAJSKI KONVENCIJI

    OpenAIRE

    Drobnič, Primož

    2015-01-01

    CISG definira istovetnost kot dolžnost prodajalca, da dobavi blago, ki je po količini, kakovosti, vrsti in pakiranju skladno s pogodbo. V odsotnosti dogovora, lastnosti blaga določi konvencija. Kršitev katerekoli omenjene predpostavke pomeni kršitev pogodbe. CISG torej enotno obravnava pojem kršitve pogodbe in nanj navezuje ustrezne sankcije. A to ne pomeni, da lahko kupec po CISG uveljavlja katerokoli sankcijo želi. Sankcije so namreč odvisne od teže kršitve. Konvencija to problematiko ureja...

  11. Optimization of Carbon Coatings on LiFePO4

    Energy Technology Data Exchange (ETDEWEB)

    Doeff, Marca M.; Wilcox, James D.; Kostecki, Robert; Lau, Grace

    2005-07-14

    The electrochemical performance of LiFePO{sub 4} in lithium cells is strongly dependent on the structure (disordered/graphene or D/G ratio) of the in situ carbon produced during synthesis from carbon-containing precursors. Addition of pyromellitic acid (PA) prior to final calcination results in lower D/G ratios, yielding a higher-rate material. Further, improvements in electrochemical performance are realized when graphitization catalysts such as ferrocene are also added during LiFePO{sub 4} preparation, although overall carbon content is still less than 2 wt.%.

  12. Po Superconducting Magnet:detail of the windings

    CERN Multimedia

    1982-01-01

    The Po superconducting dipole was built as a prototype beam transport magnet for the SPS extracted proton beam Po. Its main features were: coil aperture 72 mm, length 5 m, room-temperature yoke, NbTi cable conductor impregnated with solder, nominal field 4.2 T at 4.7 K (87% of critical field). It reached its nominal field without any quench. The photo shows a detail of the inner layer winding before superposing the outer layer to form the complete coil of a pole. Worth noticing is the interleaved glass-epoxy sheet (white) with grooved channels for the flow of cooling helium. See also 8307552X.

  13. Enhanced photo-stability and photocatalytic activity of Ag3PO4 via modification with BiPO4 and polypyrrole

    Science.gov (United States)

    Cai, Li; Jiang, Hui; Wang, Luxi

    2017-10-01

    Ag3PO4 photocatalysts modified with BiPO4 and polypyrrole (PPy) were successfully synthesized via a combination of co-precipitation hydrothermal technique and oxidative polymerization method. Their morphologies, structures and optical and electronic properties were characterized by means of scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDS), transmission electron microscope (TEM), Brunauer-Emmett-Teller (BET) surface areas, X-ray diffraction (XRD), fourier transform infrared spectra (FT-IR), X-ray photo-electron spectroscopy (XPS), UV-vis diffuse reflection spectra (UV-vis DRS), photocurrent technique and electrochemical impedance spectra (EIS). The typical triphenylmethane dye (malachite green) was chosen as a target organic contaminants to estimate the photocatalytic activities and photo-stabilities of Ag3PO4-BiPO4-PPy heterostructures under visible light irradiation. The results indicated that the existence of BiPO4 and PPy not only showed great influences on the photocatalytic activity, but also significantly enhanced photo-stability of Ag3PO4 in repeated and long-term applications. The degradation conversion of Ag3PO4-BiPO4-PPy heterostructures (ABP-3) was 1.58 times of that of pure Ag3PO4. The photo-corrosion phenomenon of Ag3PO4 was effectively avoided. The photocatalytic activity of up to 87% in the Ag3PO4-BiPO4-PPy heterostructures (ABP-3) can be remained after five repeated cycles, while only about 33% of the degradation efficiency can be reserved in pure Ag3PO4. The possible mechanism of enhanced photo-stability and photocatalytic activity of Ag3PO4-BiPO4-PPy heterostructures was also discussed in this work.

  14. Poétique de l’invective dans les Poèmes aristophanesques de Laurent Tailhade

    Directory of Open Access Journals (Sweden)

    Laurent Robert

    2012-04-01

    Full Text Available Parmi l’abondant corpus traité par Marc Angenot dans La Parole pamphlétaire, les ouvrages de Laurent Tailhade Au Pays du mufle et À travers les Grouins [sic] constituent les seuls recueils poétiques. L’essayiste y voit une illustration du genre de la satire poétique, revivifié dès la fin du xviiie siècle avec les Iambes d’André Chénier, puis au xixe notamment par Auguste Barbier et Victor Hugo. Tailhade pourrait ainsi, superficiellement, être considéré comme le poète satiriste de la Troisième...

  15. Concentrations of {sup 210}Po in fish and shellfish from southern region of Japan and evaluation of {sup 210}Po intake from seafood for Japanese people

    Energy Technology Data Exchange (ETDEWEB)

    Momoshima, N.; Sugihara, S. [Kyushu Univ., Fukuoka (Japan). Radioisotope Center; Nakao, H. [Kyushu Univ., Fukuoka (Japan). Graduate School of Sciences

    2012-07-01

    Concentrations of {sup 210}Po in fish and shellfish, mostly collected from southern region of Japan were analyzed. Values ranged from 0.2 to 229 Bq/kg fresh weight and higher concentrations were observed in samples analyzed with viscera. Intake of {sup 210}Po through fish and shellfish was evaluated at different Japanese cities based on statistical consumption data. Phytoplankton, Heterosigma akashiwo was collected during a harmful algal bloom and {sup 210}Po was analyzed. The phytoplankton occupied only 4.4% of {sup 210}Po in seawater and a large fraction of {sup 210}Po was observed in the particulate form. (orig.)

  16. [Establishment and activity of PoKuNyoKwan].

    Science.gov (United States)

    Lee, Bang Weon

    2008-06-01

    PoKuNyoKwan was established in 1887 by Meta Howard, a female doctor who was dispatched from Woman's Foreign Missionary Society, an evangelical branch affiliated with U.S. North Methodist Church. PoKuNyoKwan was equipped with dispensaries, waiting rooms, pharmacies, warehouses, operating rooms, and wards for about 30 patients. It used a traditional Korean house, which was renovated for its medical purpose, in Ewha Haktang. Residing in Chung Dong, the medical institution had taken care of women's mental and physical health for about 25 years, until it was merged with East Gate Lillian Harris Memorial Hospital in 1912, and then its dispensary function was abolished in 1913. Medical missionaries (Meta Howard, Rosetta Sherwood, Mary M. Cutler, Emma Ernsberger, Esther K. Pak, Amanda F. Hillman) and nurse missionaries (Ella Lewis, Margaret J. Edmunds, Alta I. Morrison, Naomi A. Anderson), who were professionally trained in the United States, and their helpers, who were trained by those missionaries, managed PoKuNyoKwan. Nurses who were educated in Nurses' Training School, which was also established by PoKuNyoKwan, helped to run the institution as well. At the beginning, they usually had worked as a team of one medical missionary and three helpers. Since its establishment in 1903, however, the helpers began to enter the Nurses' Training School to become professional nurses, and the helpers eventually faded out because of the proliferation of those nurses. PoKuNyoKwan did not only offer medical services but also executed educational and evangelical activities. Medical missionaries struggled to overcome Koreans' ignorance and prejudice against westerners and western medical services, while they took care of their patients at office, for calls, and in hospital dispensaries. Enlightening the public by criticizing Korean traditional medical treatments including fork remedies, acupuncture, and superstitions, they helped modernization of medical systems in Korea. In the area of

  17. A novel route for FePO4 olivine synthesis from sarcopside oxidation

    Science.gov (United States)

    Crouzet, Camille; Recham, Nadir; Brunet, Fabrice; Findling, Nathaniel; David, Rénald; Sougrati, Moulay-Tahar

    2016-12-01

    Heterosite FePO4 is synthesized for the first time by direct thermal oxidation of sarcopside Fe3(PO4)2. Both FePO4 and Fe3(PO4)2 have a pseudo olivine structure. Complete isostructural conversion of sarcopside into FePO4 is achieved at a temperature of 450 °C within 3 days according to the reaction Fe3(PO4)2 + ¾ O2 → 2 FePO4 + ½ Fe2O3 which leads to the extraction of iron from the sarcopside structure. Appropriate heating ramp must be applied in order to avoid the crystallization of Fe7(PO4)6. Electrochemical performances of the oxidation product are consistent with those of olivine FePO4.

  18. In situ growth of Ag3PO4 on N-BiPO4 nanorod: A core-shell heterostructure for high performance photocatalyst.

    Science.gov (United States)

    Li, Junqi; Yuan, Huan; Zhu, Zhenfeng

    2016-01-15

    Enhanced light absorption and effective separation of photogenerated charges are the main strategies to improve the performance of photocatalytic materials. In this study, Ag3PO4/N-doped BiPO4 (N-BiPO4) core-shell structure photocatalyst was synthesized by a simple in-situ growth strategy in an organic solvent. The separation of photogenerated electron-hole was enhanced by the doping of nitrogen, because of the emergence of N-O impurity energy levels. The increased photocatalytic activity of Ag3PO4/N-BiPO4 could be attributed to the in-situ formation of chemical bonds between Ag3PO4 and N-BiPO4, which accelerate the separation of electron-hole pairs. The photocatalytic performance of the as-synthesized Ag3PO4/N-BiPO4 was evaluated by monitoring the decolorization of methyl orange under sunlight irradiation. Ag3PO4/N-BiPO4 was capable of bleaching 95% MO within 40min. Copyright © 2015 Elsevier Inc. All rights reserved.

  19. Proč počítáme a co počítáme?

    Czech Academy of Sciences Publication Activity Database

    Wiedermann, Jiří

    2014-01-01

    Roč. 59, č. 1 (2014), s. 33-43 ISSN 0032-2423 R&D Projects: GA ČR GAP202/10/1333 Institutional support: RVO:67985807 Keywords : výpočet * znalosti * výpočetní systémy * generování znalostí Subject RIV: IN - Informatics, Computer Science http://www. youtube .com/watch?v=Llot-KUbVRU http://hdl.handle.net/10338.dmlcz/143737

  20. PRIMERJAVA IZGRADNJE ŽELEZNIŠKE PROGE PO KLASIČNI METODI IN PO METODI TIRA NA TOGI PODLAGI

    OpenAIRE

    Pirš, Jurij

    2011-01-01

    Diplomska naloga obravnava primerjavo tehnologije gradnje železniške proge po klasični metodi in po metodi tira na togi podlagi. Predstavljene so osnovne zahteve za projektiranje železniške proge in kriteriji za izdelavo posameznih elementov spodnjega in zgornjega ustroja proge skupaj z opisom in uporabo gradbene mehanizacije. V nadaljevanju sledi predstavitev uporabe tehnologije tira na togi podlagi v predorih na odseku Košana – Gornje Ležeče. Prikazana je podrobna analiza togega tira s...

  1. Research Update: Retardation and acceleration of phase separation evaluated from observation of imbalance between structure and valence in LiFePO4/FePO4 electrode

    Directory of Open Access Journals (Sweden)

    Kazuya Tokuda

    2014-07-01

    Full Text Available LiFePO4 is a potential positive electrode material for lithium ion batteries. We have experimentally observed an imbalance between the valence change of Fe ions and the structure change from the LiFePO4 phase to the FePO4 phase during delithiation by simultaneous in situ XRD and XANES measurements in an LiFePO4/FePO4 electrode. The ratio of structure change to valence change clearly indicates that the phase separation from LiFePO4 to FePO4 is suppressed at the beginning of delithiation, while it is accelerated at the latter stage, which is due to the coherent strain caused by the lattice misfit between the two phases.

  2. Recoil-deposited Po-210 in radon dwellings

    Energy Technology Data Exchange (ETDEWEB)

    Samuelsson, C.

    1990-12-31

    Short-lived decay products of Rn-222 plate out on all surfaces in a house containing radon gas. Following the subsequent alpha decays of the mother nuclei, the daughter products Pb-214 and Pb-210 are superficially and permanently absorbed. Due to its long half-life (22 y) the activity of absorbed Pb-210 accumulates in the surface. The activity of Pb-210, or its decay products, can thus reflect the past randon daughter and plate-out history of a house over several decades. Our results and experience from measurements of Po-210 and Rn-222 in 22 dwellings will be presented. In these studies the Po-210 surface activity of one plane glass sheet per dwelling (window panes were not used) has been determined and compared with the period of exposure times the mean radon concentration measured over a two-month period. Considering the large uncertainty in the integrated radon exposure estimate the surface {sup 210}Po correlates well (r=0.73) with the accumulated radon exposure. The {sup 210}Po activity of the glass samples has been measured non-destructively using an open-flow pulse ionization chamber and this detector has also been successfully applied in field exercises.

  3. Recoil-deposited Po-210 in radon dwellings

    Energy Technology Data Exchange (ETDEWEB)

    Samuelsson, C.

    1990-01-01

    Short-lived decay products of Rn-222 plate out on all surfaces in a house containing radon gas. Following the subsequent alpha decays of the mother nuclei, the daughter products Pb-214 and Pb-210 are superficially and permanently absorbed. Due to its long half-life (22 y) the activity of absorbed Pb-210 accumulates in the surface. The activity of Pb-210, or its decay products, can thus reflect the past randon daughter and plate-out history of a house over several decades. Our results and experience from measurements of Po-210 and Rn-222 in 22 dwellings will be presented. In these studies the Po-210 surface activity of one plane glass sheet per dwelling (window panes were not used) has been determined and compared with the period of exposure times the mean radon concentration measured over a two-month period. Considering the large uncertainty in the integrated radon exposure estimate the surface {sup 210}Po correlates well (r=0.73) with the accumulated radon exposure. The {sup 210}Po activity of the glass samples has been measured non-destructively using an open-flow pulse ionization chamber and this detector has also been successfully applied in field exercises.

  4. Po kanalu TBTs pokazhut film o "Vaffen-SS"

    Index Scriptorium Estoniae

    2006-01-01

    Vene filmistuudio Treti Rim on tootnud lätivastase ajaloolise dokumentaali-propagandafilmi Teisest Maailmasõjast "Natslus Balti moodi" ("Natsizm po pribaltiski"). Filmi näitab täna Vene telekanal TVT, andes siiski võimaluse eetris esineda Läti Venemaa suursaadikule Andris Teikmanisele

  5. Adsorption gas chromatography with 150-ms {sup 216}Po

    Energy Technology Data Exchange (ETDEWEB)

    Vogt, A. [Bern Univ. (Switzerland); Gaeggeler, H.W.; Tuerler, A. [Paul Scherrer Inst. (PSI), Villigen (Switzerland)

    1997-09-01

    A gas chromatography apparatus was developed, which allows experiments with volatile radionuclides having shorter half-lives than one second. This apparatus was tested with the 150-ms isotope {sup 216}Po. Experimental data were compared with a Monte Carlo model to determine the adsorption enthalpy {Delta}H{sub a}. (author) 2 figs., 2 refs.

  6. SrMnII2MnIII(PO43

    Directory of Open Access Journals (Sweden)

    Ghaleb Alhakmi

    2013-09-01

    Full Text Available The title compound, strontium trimanganese tris(orthophosphate, was synthesized under hydrothermal conditions. Its structure is isotypic to that of the lead analogue PbMnII2MnIII(PO43. Two O atoms are in general positions, whereas all others atoms are in special positions. The Sr and one P atom exhibit mm2 symmetry, the MnII atom 2/m symmetry, the MnIII atom and the other P atom .2. symmetry and two O atoms are located on mirror planes. The three-dimensional network of the crystal structure is made up of two types of chains running parallel to [010]. One chain is linear and is composed of alternating MnIIIO6 octahedra and PO4 tetrahedra sharing vertices; the other chain has a zigzag arrangement and is built up from two edge-sharing MnIIO6 octahedra connected to PO4 tetrahedra by edges and vertices. The two types of chains are linked through PO4 tetrahedra, leading to the formation of channels parallel to [100] and [010] in which the SrII ions are located. They are surrounded by eight O atoms in the form of a slightly distorted bicapped trigonal prism.

  7. La conciencia poética de Bécquer

    OpenAIRE

    López Castro, Armando

    2002-01-01

    575 p. En la evolución poética de Bécquer domina una musicalidad interior y su lenguaje, en su aproximación al ideal de la música, se libera de su materialidad sonora y tiende a una mayor simplicidad y plenitud, a expresar lo esencial

  8. Protection of Marine Mammals (PoMM) (abstract)

    NARCIS (Netherlands)

    Knoll, M.; Ciaccia, E.; Dekeling, R.P.A.; Kvadsheim, P.H.; Liddell, K.; Gunnarsson, S.L.; Ludwig, S.; Nissen, I.; Lorenzen, D.; Kreimeyer, R.; Pavan, G.; Meneghetti, N.; Nordlund, N.; Benders, F.P.A.; Zwan, T. van der; Fraser, L.; Johansson, T.; Garmelius, M.

    2013-01-01

    The EDA (European Defence Agency) project PoMM (Protection of Marine Mammals) is based on an agreement between the Ministries of Defence for Germany, Italy, the Netherlands, Norway, Sweden and the United Kingdom. The project, running for 3 years since August 2010, aims to protect marine mammals

  9. Development of a Portable Motor Learning Laboratory (PoMLab.

    Directory of Open Access Journals (Sweden)

    Ken Takiyama

    Full Text Available Most motor learning experiments have been conducted in a laboratory setting. In this type of setting, a huge and expensive manipulandum is frequently used, requiring a large budget and wide open space. Subjects also need to travel to the laboratory, which is a burden for them. This burden is particularly severe for patients with neurological disorders. Here, we describe the development of a novel application based on Unity3D and smart devices, e.g., smartphones or tablet devices, that can be used to conduct motor learning experiments at any time and in any place, without requiring a large budget and wide open space and without the burden of travel on subjects. We refer to our application as POrtable Motor learning LABoratory, or PoMLab. PoMLab is a multiplatform application that is available and sharable for free. We investigated whether PoMLab could be an alternative to the laboratory setting using a visuomotor rotation paradigm that causes sensory prediction error, enabling the investigation of how subjects minimize the error. In the first experiment, subjects could adapt to a constant visuomotor rotation that was abruptly applied at a specific trial. The learning curve for the first experiment could be modeled well using a state space model, a mathematical model that describes the motor leaning process. In the second experiment, subjects could adapt to a visuomotor rotation that gradually increased each trial. The subjects adapted to the gradually increasing visuomotor rotation without being aware of the visuomotor rotation. These experimental results have been reported for conventional experiments conducted in a laboratory setting, and our PoMLab application could reproduce these results. PoMLab can thus be considered an alternative to the laboratory setting. We also conducted follow-up experiments in university physical education classes. A state space model that was fit to the data obtained in the laboratory experiments could predict the

  10. Influence of temperature and frequency on ionic conductivity of Li{sub 3}PO{sub 4}–Pb{sub 3}(PO{sub 4}){sub 2}–BiPO{sub 4} phosphate glasses

    Energy Technology Data Exchange (ETDEWEB)

    El Moudane, M., E-mail: m.elmoudane@gmail.com [Laboratoire de Matériaux, Nanotechnologies et Environnement, Université Mohammed V de Rabat, Faculté des Sciences, Av. Ibn Batouta, B.P. 1014 Rabat (Morocco); El Maniani, M.; Sabbar, A. [Equipe de Physico-chimie des Matériaux et Nanomatériaux: Dépollution, Environnement et Développement Durable, Université Mohammed V de Rabat, Faculté des Sciences, Av. Ibn Batouta, B.P. 1014 Rabat (Morocco); Ghanimi, A.; Tabyaoui, M.; Bellaouchou, A.; Guenbour, A. [Laboratoire de Matériaux, Nanotechnologies et Environnement, Université Mohammed V de Rabat, Faculté des Sciences, Av. Ibn Batouta, B.P. 1014 Rabat (Morocco)

    2015-12-15

    Highlights: • Results of ionic conductivities of Li{sub 3}PO{sub 4}–Pb{sub 3}(PO{sub 4}){sub 2}–BiPO{sub 4} phosphate glasses. • Determination of glass transition temperature using DSC method. • Study of temperature and frequency on ionic conductivity of Li{sub 3}PO{sub 4}–Pb{sub 3}(PO{sub 4}){sub 2}–BiPO{sub 4} phosphate glasses. - Abstract: Lithium–Lead–Bismuth phosphates glasses having, a composition 30Li{sub 3}PO{sub 4}–(70 − x)Pb{sub 3}(PO{sub 4}){sub 2}–xBiPO{sub 4} (45 ≤ x ≤ 60 mol%) were prepared by using the melt quenching method 1000 °C. The thermal stability of theses glasses increases with the substitution of Bi{sub 2}O{sub 3} with PbO. The ionic conductivity of all compositions have been measured over a wide temperature (200–500 °C) and frequency range (1–106 Hz). The ionic conductivity data below and above T{sub g} follows Arrhenius and Vogel–Tamman–Fulcher (VTF) relationship, respectively. The activation energies are estimated and discussed. The dependence in frequency of AC conductivity is found to obey Jonscher’s relation.

  11. Depositional patterns in the modern Po delta system

    Science.gov (United States)

    Correggiari, A.; Cattaneo, A.; Trincardi, F.

    2003-04-01

    The late-Holocene Adriatic Highstand Systems Tract (HST) includes three genetically-related depocenters: 1) the Po delta and prodelta, 2) the central Adriatic prodelta wedge, fed from the Po and coalescing Apennine rivers, and 3) the Gargano subaqueous delta nourished by shore-parallel sediment advection, 600 km south of the Po delta. Progradation of the Po delta wedge started at 5.5 kyr BP and was characterised by alternating phases of rapid advance, switch and abandonment of coastal and deltaic apparatuses, resulting in a composite deposit formed by minor units. Delta and prodelta construction occurred under the forcing of high-frequency climatic change, autocyclic switches and anthropogenic causes, acting at variable but generally short time scales. During the first part of the highstand progradational phase, avulsion was an important process in delta building, and the location of avulsion sites was influenced by natural factors. After a major natural avulsion in the 12th century, the main axis of Po river transport shifted northwards and its southern branches lost their importance. Strong anthropogenic forcing on the river regime coupled with climate switch to colder conditions caused the huge outbuilding of the modern delta since the Little Ice Age (ca. 1450 - 1850 AD), resulting in a complete re-shaping of the northern Adriatic shoreline. Two different types of depositional patterns are detectable from VHR sesmic lines recorded offshore: a) the delta lobes fed by individual distributary mouths, onlap onto each other and reflect autocyclic processes, driven by discharge and sediment load variations, and human interference; and b) erosional features locally detactable close to individual distributary channels. The channel-like forms record repeated episods of cut and fill; they occur isolated or in clusters with widths of 10-30 m and depths up to 4 m. These features could be related to episodic catastrophic reactivation of Po river branches, driven by man needs

  12. 76 FR 40849 - Post Office (PO) Box Fee Groups for Merged Locations

    Science.gov (United States)

    2011-07-12

    ... 111 Post Office (PO) Box Fee Groups for Merged Locations AGENCY: Postal Service. TM ACTION: Proposed... Service, Domestic Mail Manual (DMM ) 508.4 to allow Post Office TM (PO) Box fee groups to be merged due to... , with a subject line of ``PO Box Fee Group for Merged Locations.'' Faxed comments are not accepted. FOR...

  13. High rate performance of LiFePO4 cathode materials co-doped with ...

    Indian Academy of Sciences (India)

    Administrator

    ies applying to current and future portable electronic devices and electrical vehicles. In a word, co-doped LiFePO4 with carbon and metallic ion is a promising way to reinforce the electronic conduc- tivity of LiFePO4. It could improve the conductivity both between the LiFePO4 particles and the intrinsic electronic conductivity.

  14. A Hybrid PO - Higher-Order Hierarchical MoM Formulation using Curvilinear Geometry Modeling

    DEFF Research Database (Denmark)

    Jørgensen, E.; Meincke, Peter; Breinbjerg, Olav

    2003-01-01

    A very efficient hybrid PO-MoM method has been presented. In contrast to existing methods, the present solution employs higher-order hierarchical basis functions to discretize the MoM and PO currents. This allows to reduce the number of basis functions in both the PO and MoM regions considerably...

  15. Realizace počítačové audiometrie

    OpenAIRE

    Solnický, Jan

    2010-01-01

    Tato práce se zabývá realizací počítačové audiometrie pro subjektivní vyšetření sluchu. V práci je popsána implementace audiometru v prostředí C++ Borland Builder. Navržený audiometr se skládá ze standardního počítače s operačním systémem Windows, zvukové karty a sluchátek. Práce také obsahuje rozbor problematiky poruch sluchu a jejích vyšetření, které byly použity při implementaci audiometru. This project describes the implementation of computer audiometry for subjective hearing tests. Th...

  16. High pressure structural phase transitions of PbPo

    Energy Technology Data Exchange (ETDEWEB)

    Bencherif, Y.; Boukra, A. [Departement de Physique, Faculte des Sciences, Universite de Mostaganem (Algeria); Departement de Physique, Universite des Sciences et de la Technologie d' Oran, USTO, Oran (Algeria); Zaoui, A., E-mail: azaoui@polytech-lille.fr [Universite Lille Nord de France, LGCgE (EA 4515) Lille1, Polytech' Lille, Cite Scientifique, Avenue Paul Langevin, 59655 Villeneuve D' Ascq Cedex (France); Ferhat, M. [Departement de Physique, Universite des Sciences et de la Technologie d' Oran, USTO, Oran (Algeria)

    2012-09-01

    First-principles calculations have been performed to investigate the high pressure phase transitions and dynamical properties of the less known lead polonium compound. The calculated ground state parameters for the NaCl phase show good agreement with the experimental data. The obtained results show that the intermediate phase transition for this compound is the orthorhombic Pnma phase. The PbPo undergoes from the rocksalt to Pnma phase at 4.20 GPa. Further structural phase transition from intermediate to CsCl phase has been found at 8.5 GPa. In addition, phonon dispersion spectra were derived from linear-response to density functional theory. In particular, we show that the dynamical properties of PbPo exhibit some peculiar features compared to other III-V compounds. Finally, thermodynamics properties have been also addressed from quasiharmonic approximation.

  17. PoV-GAME: puntos de vista mediante juegos

    National Research Council Canada - National Science Library

    Zapata-Jaramillo, Carlos; Gonzalez-Calderon, Guillermo; Rivera, Darliana

    2012-01-01

    .... Por ello, en este articulo se propone "PoV-GAME", una nueva forma de "jugar aprendiendo", la cual busca fortalecer algunos conceptos basicos en la ingenieria de software como la consistencia en la informacion que se maneja a lo largo de un proyecto y afianzar la importancia de los puntos de vista en el desarrollo de un producto de software. Posteriormente, se analizan los resultados obtenidos luego de realizar el juego en diferentes grupos de estudiantes.

  18. Electrocaloric effect in KH2PO4 family crystals

    Directory of Open Access Journals (Sweden)

    A.S. Vdovych

    2014-12-01

    Full Text Available The proton ordering model for the KH2PO4 type ferroelectrics is modified by taking into account the dependence of the effective dipole moments on the proton ordering parameter. Within the four-particle cluster approximation we calculate the crystal polarization and explore the electrocaloric effect. Smearing of the ferroelectric phase transition by a longitudinal electric field is described. A good agreement with experiment is obtained.

  19. Duas poéticas, dois olhares sobre o Barroco

    Directory of Open Access Journals (Sweden)

    Rogério Barbosa da Silva

    1998-12-01

    Full Text Available Resumo: Este ensaio pretende estudar relações existentes entre as poéticas de Affonso Ávila e Haroldo de Campos no contexto da poesia contemporânea, compreendendo o sentido que o Barroco adquiriu em suas produções criativas e críticas. Palavras-chave: experimentalismo, poesia concreta, Barroco, poesia crítica

  20. A biokinetic study of {sup 209}Po in man

    Energy Technology Data Exchange (ETDEWEB)

    Henricsson, C.F.; Ranebo, Y. [Department of Medical Radiation Physics, Clinical Sciences in Lund, Lund University, Skane University Hospital in Lund (Sweden); Hansson, M. [Medical Radiation Physics, Department of Clinical Sciences in Malmoe, Lund University, Skane University Hospital in Malmoe (Sweden); Raeaef, C.L., E-mail: Christopher.Raaf@med.lu.se [Medical Radiation Physics, Department of Clinical Sciences in Malmoe, Lund University, Skane University Hospital in Malmoe (Sweden); Holm, E. [Norwegian Radiation Protection Authority, Osteras (Norway)

    2012-10-15

    Five adult volunteers participated in a biokinetic study of radioactive polonium. Portions of about 10 Bq of {sup 209}Po were orally administrated to four of the volunteers in a single ingestion. The fifth volunteer ingested a daily amount of 53 mBq of 209Po for 243 d to study the time to achieve equilibrium between intake and excretion for protracted intakes. For the subjects ingesting single intakes of {sup 209}Po complete sampling of urine and feces was subsequently collected the first few days upon the ingestion. The samples were processed with radiochemical extraction and analyzed with alpha spectrometry. In the study, the maximum daily excretion rates in feces were 18-50% of the ingested activity, observed within 3 d after intake. Regarding the urine excretion, the daily excretion peaked, on average, at 0.15-1% of the ingested activity within two days upon intake. These results indicate an average gastro-intestinal uptake fraction of 0.46 {+-} 0.08, which agrees well with earlier biokinetic studies of polonium in man. -- Highlights: Black-Right-Pointing-Pointer Human metabolism of an oral intake of polonium. Black-Right-Pointing-Pointer 4 individuals were administrated about 10 Bq polonium-209. Black-Right-Pointing-Pointer Gastro-intestinal uptake fraction, if orally administrated polonium-209 was investigated. Black-Right-Pointing-Pointer The biological half-time of polonium in human body was studied.

  1. Grupo Poéticas Digitais: projetos desluz e amoreiras

    Directory of Open Access Journals (Sweden)

    Gilbertto Prado

    2010-01-01

    Full Text Available O Grupo Poéticas Digitais foi criado em 2002, no Departamento de Artes Plásticas da ECA-USP, com a intenção de gerar um núcleo multidisciplinar, promovendo o desenvolvimento de projetos experimentais e a reflexão sobre o impacto das novas tecnologias no campo das artes. O Grupo é um desdobramento do projeto wAwRwT, iniciado em 1995 por Gilbertto Prado e tem como participantes professores, artistas, pesquisadores e estudantes. O objetivo deste texto é apresentar algumas experimentações recentes de projetos poéticos como Desluz, de 2009/2010, e Amoreiras, de 2010.Poéticas Digitais Group was created in 2002 in the Visual Arts Department at ECA-USP to create a multidisciplinary center, promoting the development of experimental projects and reflection on the impact of new technologies in the field of arts. The Group is an unfolding of the wAwRwT project started in 1995 by Gilbertto Prado and has as participants lecturers, artists, researchers and students. The aim of this article is to present some recent experiments such as "desluz", (2009/2010 and "amoreiras".

  2. 210Po in Human Saliva of Smokeless Tobacco Users.

    Science.gov (United States)

    Meli, Maria Assunta; Desideri, Donatella; Roselli, Carla; Feduzi, Laura

    2017-01-01

    The occurrence and mobility of Po in oral smokeless tobacco products (STPs) were determined because its effects on human health must be taken into account. This research was subdivided into two parts: determination by alpha spectrometry of the Po activity concentration in 16 oral smokeless tobacco products of different brands purchased in local specialty stores in Europe and evaluation of its percent extraction into an artificial salivary gland during sucking or chewing operations. Polonium-210 was detected in all samples, and its concentrations ranged from 3.46 to 14.8 Bq kg (mean value of 7.45 ± 3.82 Bq kg). The highest concentration was found in chewing tobacco. The samples showed no significant difference in the content of Po level. The data obtained in this study show that the polonium, although poorly extracted (12.8 ± 8.96%) by artificial saliva, is not totally retained within the smokeless tobacco products, with a consequent potential health hazard associated with oral use of these products.

  3. Studies of the balance 210Pb - 210Po in glasses; Estudios del equilibrio 210Pb - 210Po en vidrios

    Energy Technology Data Exchange (ETDEWEB)

    Torre Pérez, J. de la; Martín Sánchez, A.; Ruano Sánchez, A.B.

    2014-07-01

    Retrospective dosimetry requires measurement methods allowing the determination of Radon concentration in the past. One of the such methods is based on the direct measurement of 210Po implanted on the surface of objects, whose activity concentration (Bq/m2), is directly related to the cumulative exposure due to the concentration of 222Rn (Bq/m3) for long time. These determinations are possible taking into consideration the equilibrium between 210Po (T1/2 = 138.378 days) and its parent 210Pb (T1/2 = 22.3 years), being both radionuclides from the 222Rn progeny. In previous works about the determination of the conversion factor (ratio between the concentration of 210Po in objects and the retrospective 222Rn concentration in air), Corresponding equilibria between descendants were assumed. In this work, an experimental study about the equilibrium 210Pb - 210Po in glasses, which were previously exposed to some radon concentrations, has been performed. Two scenarios were studied: a place with, and another place without, continuous cumulative 222Rn concentration. Results were compared with those reached by theoretical calculations from the (Bateman) activity evolution equations. [Spanish] La dosimetría retrospectiva requiere métodos de medida que permitan la determinación de la concentración de radón en el pasado. Uno de estos métodos está basado en la medida directa del 210Po implantado sobre la superficie de objetos, cuya concentración de actividad (Bq/m2), está directamente relacionada con la exposición acumulativa debida a la concentración de 222Rn (Bq/m3) durante largos períodos de tiempo. Estas determinaciones son posibles gracias al equilibrio entre el 210Po (T1/2 = 138,378 días) y su progenitor, el 210Pb (T1/2 = 22,3 años), siendo ambos radionúclidos descendientes del 222Rn. En trabajos anteriores sobre la determinación del factor de conversión (relación entre la concentración de 210Po en los objetos y la concentración de 222Rn retrospectivo en

  4. H-PoP and H-PoPG: heuristic partitioning algorithms for single individual haplotyping of polyploids.

    Science.gov (United States)

    Xie, Minzhu; Wu, Qiong; Wang, Jianxin; Jiang, Tao

    2016-12-15

    Some economically important plants including wheat and cotton have more than two copies of each chromosome. With the decreasing cost and increasing read length of next-generation sequencing technologies, reconstructing the multiple haplotypes of a polyploid genome from its sequence reads becomes practical. However, the computational challenge in polyploid haplotyping is much greater than that in diploid haplotyping, and there are few related methods. This article models the polyploid haplotyping problem as an optimal poly-partition problem of the reads, called the Polyploid Balanced Optimal Partition model. For the reads sequenced from a k-ploid genome, the model tries to divide the reads into k groups such that the difference between the reads of the same group is minimized while the difference between the reads of different groups is maximized. When the genotype information is available, the model is extended to the Polyploid Balanced Optimal Partition with Genotype constraint problem. These models are all NP-hard. We propose two heuristic algorithms, H-PoP and H-PoPG, based on dynamic programming and a strategy of limiting the number of intermediate solutions at each iteration, to solve the two models, respectively. Extensive experimental results on simulated and real data show that our algorithms can solve the models effectively, and are much faster and more accurate than the recent state-of-the-art polyploid haplotyping algorithms. The experiments also show that our algorithms can deal with long reads and deep read coverage effectively and accurately. Furthermore, H-PoP might be applied to help determine the ploidy of an organism. https://github.com/MinzhuXie/H-PoPG CONTACT: xieminzhu@hotmail.comSupplementary information: Supplementary data are available at Bioinformatics online. © The Author 2016. Published by Oxford University Press. All rights reserved. For Permissions, please e-mail: journals.permissions@oup.com.

  5. Effect of Li3PO4 coating of layered lithium-rich oxide on electrochemical performance

    Science.gov (United States)

    Chen, Dongrui; Zheng, Feng; Li, Liu; Chen, Min; Zhong, Xiaoxin; Li, Weishan; Lu, Li

    2017-02-01

    A novel composite of layered lithium-rich oxide, Li-Rich@Li3PO4, coated with Li3PO4 is synthesized through polydopamine template method. Physical characterizations reveal that Li-Rich@Li3PO4 is composed of nanoparticles of 100-200 nm that are coated with a uniform Li3PO4 layer of about 5 nm in thickness. Galvanostatic charge/discharge tests demonstrate enhanced cycling stability and largely increased rate capability of the material after Li3PO4 coating.

  6. Structure and mutual transformations of anhydrous and hydrous CsMgPO4

    Science.gov (United States)

    Borovikova, E. Yu.; Ksenofontov, D. A.; Kabalov, Yu. K.; Kurazhkovskaya, V. S.; Stefanovich, S. Yu.; Korchemkin, I. V.; Asabina, E. A.

    2012-07-01

    A complex study of the synthetic CsMgPO4 phosphate with a β-tridymite structure type is performed. It is found that CsMgPO4 is an unstable phase. At room temperature in air, it absorbs water and turns into the CsMgPO4 · 6H2O crystal hydrate. The transformation of cubic CsMgPO4 · 6H2O into orthorhombic CsMgPO4 proceeds upon heating to 150°C by the pattern of the first-order phase transition with the dehydration of the specimen.

  7. AHP 47: A RIG RGAD PO THREATENS THE BUDDHA WITH HIS WALKING STICK

    Directory of Open Access Journals (Sweden)

    Sangs rgyas bkra shis སངས་རྒྱས་བཀྲ་ཤིས།

    2017-04-01

    Full Text Available I heard that A rig rgad po was from a place that has the name he is known by - A rig rgad po – which is near Mtsho sngon po (Qinghai Lake. The people there are very traditional, very direct in their manner, and devoted Buddhists. They often go on pilgrimage to Lha sa. Stories about A rig rgar po describe their travels and encounters with Buddhas in Lha sa. I heard stories about A rig rgad po from my father's brother, Mkhyen rab rgya mtsho (b. ~1973, during the time I was a student at a school in Rwa rgya (2005-2011. ...

  8. Experimental Evaluation of the Transport Mechanisms of PoIFN-α in Caco-2 Cells

    Directory of Open Access Journals (Sweden)

    Xin Liu

    2017-11-01

    Full Text Available For the development of an efficient intestinal delivery system for Porcine interferon-α (PoIFN-α, the understanding of transport mechanisms of which in the intestinal cell is essential. In this study, we investigated the absorption mechanisms of PoIFN-α in intestine cells. Caco-2 cells and fluorescein isothiocyanate-labeled (FITC-PoIFN-α were used to explore the whole transport process, including endocytosis, intracellular trafficking, exocytosis, and transcytosis. Via various techniques, the transport pathways of PoIFN-α in Caco-2 cells and the mechanisms were clarified. Firstly, the endocytosis of PoIFN-α by Caco-2 cells was time, concentration and temperature dependence. And the lipid raft/caveolae endocytosis was the most likely endocytic pathway for PoIFN-α. Secondly, both Golgi apparatus and lysosome were involved in the intracellular trafficking of PoIFN-α. Thirdly, the treatment of indomethacin resulted in a significant decrease of exocytosis of PoIFN-α, indicating the participation of cyclooxygenase. Finally, to evaluate the efficiency of PoIFN-α transport, the transepithelial electrical resistance (TEER value was measured to investigate the tight junctional integrity of the cell monolayers. The fluorescence microscope results revealed that the transport of PoIFN-α across the Caco-2 cell monolayers was restricted. In conclusion, this study depicts a probable picture of PoIFN-α transport in Caco-2 cells characterized by non-specificity, partial energy-dependency and low transcytosis.

  9. Experimental Evaluation of the Transport Mechanisms of PoIFN-α in Caco-2 Cells.

    Science.gov (United States)

    Liu, Xin; Zheng, Sidi; Qin, Yue; Ding, Wenya; Tu, Yabin; Chen, Xingru; Wu, Yunzhou; Yanhua, Li; Cai, Xuehui

    2017-01-01

    For the development of an efficient intestinal delivery system for Porcine interferon-α (PoIFN-α), the understanding of transport mechanisms of which in the intestinal cell is essential. In this study, we investigated the absorption mechanisms of PoIFN-α in intestine cells. Caco-2 cells and fluorescein isothiocyanate-labeled (FITC)-PoIFN-α were used to explore the whole transport process, including endocytosis, intracellular trafficking, exocytosis, and transcytosis. Via various techniques, the transport pathways of PoIFN-α in Caco-2 cells and the mechanisms were clarified. Firstly, the endocytosis of PoIFN-α by Caco-2 cells was time, concentration and temperature dependence. And the lipid raft/caveolae endocytosis was the most likely endocytic pathway for PoIFN-α. Secondly, both Golgi apparatus and lysosome were involved in the intracellular trafficking of PoIFN-α. Thirdly, the treatment of indomethacin resulted in a significant decrease of exocytosis of PoIFN-α, indicating the participation of cyclooxygenase. Finally, to evaluate the efficiency of PoIFN-α transport, the transepithelial electrical resistance (TEER) value was measured to investigate the tight junctional integrity of the cell monolayers. The fluorescence microscope results revealed that the transport of PoIFN-α across the Caco-2 cell monolayers was restricted. In conclusion, this study depicts a probable picture of PoIFN-α transport in Caco-2 cells characterized by non-specificity, partial energy-dependency and low transcytosis.

  10. Postępowanie z chorym po zawale serca

    Directory of Open Access Journals (Sweden)

    Kalina Niedolaz

    2011-10-01

    Full Text Available Choroba wieńcowa, czyli choroba niedokrwienna serca na podłożu miażdżycy tętnic wieńcowych, stanowi niezwykle istotny problem kliniczny. Jej bezpośrednim i często nieuchronnym następstwem jest zawał mięśnia serca. Zawał najczęściej jest spowodowany zamknięciem tętnicy wieńcowej w wyniku uszkodzenia blaszki miażdżycowej (jej pęknięcia lub erozji z następowym wytworzeniem dystalnego zakrzepu i powoduje zniszczenie prawidłowo działającego mięśnia sercowego. Chory po przebytym zawale mię- śnia serca należy do grupy pacjentów obciążonych wysokim ryzykiem sercowo-naczyniowym, a więc zagrożony jest wystąpieniem kolejnych incydentów, takich jak zawał, udar mózgu i zgon. Prawidłowe postępowanie po przebytym zawale pozwala na istotną redukcję ryzyka i korzystnie wpływa na rokowanie. Prewencja wtórna po zawale serca obejmuje postępowanie niefarmakologiczne, czyli modyfikację stylu życia, i leczenie farmakologiczne. Największe znaczenie ma wyeliminowanie czynników ryzyka, tj. zaprzestanie palenia papierosów, prawidłowa kontrola ciśnienia tętniczego i normalizacja poziomu cholesterolu, a także redukcja nadwagi i systematyczna aktywność fizyczna. Świadomość pacjentów i zaangażowanie lekarzy są decydujące dla osiągnięcia korzystnych efektów prewencji wtórnej po zawale serca. Artykuł przedstawia zasady, którym powinien podlegać każdy chory po zawale mięśnia serca, uwzględnia zalecenia dotyczące postępowania niefarmakologicznego, wytyczne dotyczące odpowiedniej farmakoterapii według aktualnych standardów. W pracy uwzględniono również zasady postępowania z chorym po zawale w sytuacjach szczególnych, jakimi są choroby współistniejące, takie jak nadciśnienie tętnicze, cukrzyca, dysfunkcja lewej komory i niewydolność serca, przewlekła choroba nerek, przewlekła obturacyjna choroba płuc.

  11. Luminescence Properties of ScPO{sub 4} Single Crystals

    Energy Technology Data Exchange (ETDEWEB)

    Boatner, L.A.; Trukhin, A.N.

    1999-08-16

    Flux-grown ScPO{sub 4} single crystals exhibit a number of luminescence bands in their x-ray-excited luminescence spectra - including sharp lines arising from rare-earth elements plus a number of broad bands at 5.6 cV, 4.4 eV, and 3 eV. The band at 5.6 eV was attributed to a self-trapped exciton (STE) [l], and it could be excited at 7 eV and higher energies. This luminescence is strongly polarized (P = 70 %) along the optical axes of the crystal and exhibits a kinetic decay time constant that varies from several ns at room temperature to {approximately}10 {micro}s at 60 K and up to {approximately}1 ms at 10 K. It is assumed that the STE is localized on the SC ions. The band at 3 eV can be excited in the range of the ScPO{sub 4} crystal transparency (decay time = 3 to 4 {micro}s.) This band is attributed to a lead impurity that creates different luminescence centers. At high temperatures, the band at 4.4 eV is dominant in the x-ray-excited TSL and afterglow spectra. Its intensity increases with irradiation time beginning at zero at the initial irradiation time. The 4.4 eV band does not appear in a fast process under a pulsed electron beam, showing that accumulation is necessary for its observation. A sample of ScPO{sub 4} doped with vanadium exhibited a prevalent band at 4.4 eV at T = 480 K.

  12. 210Po concentration analysis on tobacco and cigarettes in Malaysia

    Science.gov (United States)

    Azman, Muhammad Azfar; Rahman, Irman Abdul; Yasir, Muhammad Samudi

    2013-05-01

    Tobacco or better known as the cigarette was smoked since ages. Although many efforts had been made by the Ministry of Health to prevent or reduce the cigarette problem, the smokers still consider that cigarette are not harmful to health. This work is conducted to study the concentration of radionuclides alpha in tobacco and tobacco products in Malaysia. The radionuclide sought in this study is 210Po which is an alpha emitter. The sample used are tobacco and cigarettes, the tobacco samples were taken from tobacco farms in Malaysia while the sample branded cigarettes Marlboro and Gudang Garam were bought in the supermarket. The objectives of this study are to determine the concentration of radionuclides 210Po in tobacco and tobacco products as well as to estimate the radioactivity doses contributing to the smokers in Malaysia. The results for Marlboro cigarettes and Gudang Garam were found to be on the average radionuclide concentration of 210Po is 13.3 mBq/g (Marlboro cigarettes) and 11.9 mBq/g (Gudang Garam). From the total concentration of the cigarette, the estimated annual contribution dose to smokers for every 20 cigarettes smoked per day are 111.9 ± 14.7 μSv/year for Marlboro cigarettes and 100.2 ± 3.3 μSv/year for Gudang Garam cigarettes. The average concentration of radionuclides for tobacco leaf tobacco for each area taken is 3.6 mBq / g for Bachok, 2.4 mBq / g for Tumpat and 3.1 mBq / g for Semerak district.

  13. A poética de Edgar Allan Poe

    Directory of Open Access Journals (Sweden)

    Kiefer, Charles

    2009-01-01

    Full Text Available O estudo abrange o início da vida literária de Edgar Allan Poe como crítico do periódico Graham’s Magazine. Ao produzir resenhas sobre Nathanael Hawthorne, Poe elabora uma síntese de suas concepções a respeito do conto. Para o autor a vantagem do conto, como gênero, é que ele permite uma leitura totalizadora. O exame das resenhas de Poe torna possível uma aproximação entre a poética do autor norte-americado com a de Aristóteles.

  14. Perception of Blended Learning Inventory (PoBLi)

    DEFF Research Database (Denmark)

    Lassesen, Berit; Stenalt, Maria Hvid; Rossen, Dorte Sidelmann

    -to-face med online læring (Blended Learning). I et studie fandt Ellis og kolleger (2006), at undervisere, der overvejende havde opfattelsen af, at de studerende lærte ved, at han/hun formidlede viden til dem, havde en simpel, fragmenteret opfattelse af potentialet ved BL. Derimod syntes en mere......) underviseres oplevelse af undervisningsmiljøet Resultater: Spørgeskema og resultaterne af de foreløbige analyser vil blive præsenteret og diskuteret. Perspektiver: PoBLi-projektet vil bidrage til den eksisterende forskning vedrørende rationalet for inddragelse af blended learning-formatet i...

  15. Nostradamus et la poésie-fiction

    Directory of Open Access Journals (Sweden)

    Yvonne Bellenger

    2000-05-01

    Full Text Available L’article revient sur une poignée de quatrains extraits des Centuries de Nostradamus pour montrer comment la variété parfois délirante des interprétations qui leur ont été appliquées provient régulièrement d’une méconnaissance de la langue du xvie siècle (lexique et syntaxe autant que du style nébuleux du poète provençal.

  16. Nostradamus et la poésie-fiction

    OpenAIRE

    Yvonne Bellenger

    2013-01-01

    L’article revient sur une poignée de quatrains extraits des Centuries de Nostradamus pour montrer comment la variété parfois délirante des interprétations qui leur ont été appliquées provient régulièrement d’une méconnaissance de la langue du xvie siècle (lexique et syntaxe) autant que du style nébuleux du poète provençal.

  17. Šumski požari i fizikalni modeli

    OpenAIRE

    Španjol, Željko; Biljaković, Katica; Rosavec, Roman; Dominko, Damir; Barčić, Damir; Starešinić, Damir

    2008-01-01

    Hrvatska je zemlja relativno bogata šumama; 36 % od ukupne površine države pokrivaju šumske površine. Međutim, poseban problem na jadranskom području Hrvatske predstavljaju šumski požari, koji uništavaju prirodna bogatstva smanjujući biološku raznolikost, a negativan utjecaj imaju i na krajobraznu raznolikost. Sam problem je višeslojan, kompleksan i zahtijeva uključivanje brojnih grana znanosti, kao što su šumarstvo, geologija, biologija, meteorologija, a u zadnje vrijeme i fizika. Poznato...

  18. The poços de caldas project

    CERN Document Server

    Chapman, NA; Shea, ME; Smellie, JAT

    1993-01-01

    The safe disposal of radioactive wastes by burial in deep geological formations requires long-term predictions of the future behaviour of the wastes and their engineered repository. Such predictions can be tested by evaluating processes analogous to those which will occur in a repository, which have been long active in the natural geochemical environment. The Poços de Caldas Project is a comprehensive study of two ore deposits in Minas Gerais, Brazil, aimed at looking at uranium and thorium series radionuclide and rare-earth element mobility, the development and movement of redox fronts, and

  19. Vibrational analysis of nucleic acids. I. The phosphodiester group in dimethyl phosphate model compounds: (CH3O)2PO2-, (CD3O)2PO2-, and (13CH3O)2PO2-.

    OpenAIRE

    Guan, Y.; Wurrey, C.J.; Thomas Jr, G.J.

    1994-01-01

    Normal coordinate analyses and vibrational assignments are presented for the dimethyl phosphate anion [(CH3O)2PO2-] and its deuteriomethyl [(CD3O)2PO2-] and carbon-13 [(13CH3O)2PO2-] derivatives in the gauche-gauche conformation. The dimethyl phosphate anion, which is the simplest model for the nucleic acid phosphodiester moiety, exhibits many of the spectral complexities of DNA and RNA and has previously resisted a complete and consistent vibrational analysis. In the present study we make us...

  20. 210Po in Nevada groundwater and its relation to gross alpha radioactivity

    Science.gov (United States)

    Seiler, R.L.

    2011-01-01

    Polonium-210 (210Po) is a highly toxic alpha emitter that is rarely found in groundwater at activities exceeding 1 pCi/L. 210Po activities in 63 domestic and public-supply wells in Lahontan Valley in Churchill County in northern Nevada, United States, ranged from 0.01 ± 0.005 to 178 ± 16 pCi/L with a median activity of 2.88 pCi/L. Wells with high 210Po activities had low dissolved oxygen concentrations (less than 0.1 mg/L) and commonly had pH greater than 9. Lead-210 activities are low and aqueous 210Po is unsupported by 210Pb, indicating that the 210Po is mobilized from aquifer sediments. The only significant contributors to alpha particle activity in Lahontan Valley groundwater are 234/238U, 222Rn, and 210Po. Radon-222 activities were below 1000 pCi/L and were uncorrelated with 210Po activity. The only applicable drinking water standard for 210Po in the United States is the adjusted gross alpha radioactivity (GAR) standard of 15 pCi/L. 210Po was not volatile in a Nevada well, but volatile 210Po has been reported in a Florida well. Additional information on the volatility of 210Po is needed because GAR is an inappropriate method to screen for volatile radionuclides. About 25% of the samples had 210Po activities that exceed the level associated with a lifetime total cancer risk of 1× 10−4 (1.1 pCi/L) without exceeding the GAR standard. In cases where the 72-h GAR exceeds the uranium activity by more than 5 to 10 pCi/L, an analysis to rule out the presence of 210Po may be justified to protect human health even though the maximum contaminant level for adjusted GAR is not exceeded.

  1. Ontwikkeling en perspektief in die Afrikaanse poësie

    Directory of Open Access Journals (Sweden)

    A.P. Grové

    1967-03-01

    Full Text Available In die oorweging van my opdrag — om te praat oor ontwikkeling en perspektief in die Afrikaanse poësie — het ek my afgevra of, en in hoeverre dan, die terme „ontwikkeling” en „perspektief” in die verband met mekaar versoenbaar is. Op ’n bepaalde manier gesien dui dié woorde op twee benaderingswyses wat nogal skerp teenoor mekaar te staan kom. Rig ons ons op ontwikkeling, is die geskiedenis, die verloop in die tyd van deurslaggewende betekenis en sal ons in ’n hoë mate chronologies (of miskien anti-chronologies te werk moet gaan, sal ons as 't ware saam met die tyd oor die hele terrein van ons poësie moet beweeg. Soek ons na perspektief, daarenteen, word die persoonlike instelling deurslaggewend, want nou staan ons stil en kan ons vanaf ’n bewus gekose, voordelige waarnemingspunt die landskap in oënskou neem, kan ons verskynsels en verhoudinge weergee soos hulle op ’n bepaalde moment in ons gesigsveld te staan kom.

  2. Daphnia diversity in water bodies of the Po River Basin

    Directory of Open Access Journals (Sweden)

    Silvia Marková

    2016-12-01

    Full Text Available Shallow water bodies dominate the areal extent of continental waters and host a proportion of biodiversity higher than the percentage of Earth’s surface they cover. Daphnia is a key component of small aquatic ecosystems food webs. Here we present the result of a survey in 24 ponds located in the core of Po river Basin, to assess the actual spreading of Daphnia species in one of the most productive areas of the Northern hemisphere. By using diagnostic genetic markers (12S rRNA and ND5 genes we identified five Daphnia species: D. ambigua, D. curvirostris, D. longispina, D. obtusa and D. pulex in fourteen ponds. Additional analyses of two nuclear genes (LdhA and Rab4 revealed that D. pulex in the study area is native European strain. In opposite, D. ambigua shared haplotype with the North-Eastern American lineage that was introduced to Europe by long-distance dispersal. In the Po river Basin we identified a highly divergent lineage of D. longispina group that formed a clade with individuals from northern European Russia and might represent a new Daphnia species. Daphnia species in the Cremona province have European origin, except for D. ambigua which is a North American species spreading across Europe. Future attention will require monitoring of invasive species, particularly D. ambigua and the North American invasive clone of D. pulex that is already present in Northern Italy. 

  3. Assessment of river Po sediment quality by micropollutant analysis.

    Science.gov (United States)

    Camusso, Marina; Galassi, Silvana; Vignati, Davide

    2002-05-01

    Trace metals, PCB congeners and DDT homologues were determined in composite sediment samples collected from 10 representative sites along the river Po in two separate seasons. The aim was to identify the most anthropogenically impacted areas for future monitoring programmes and to aid development of Italian sediment quality criteria. The surface samples were collected during low flow conditions. Trace metal concentrations were assayed by electrothermal (Cd, Co, Cr, Cu, Ni, Pb), flame (Fe, Mn, Zn) or hydride generation (As) atomic absorption spectrometry after microwave assisted acid digestion. Hg was determined on solid samples by automated analyser. Organic microcontaminants were determined by gas-chromatography with 63Ni electron capture detector after Soxhlet extraction. Concentrations of trace metals, total PCB and DDT homologues showed two distinct peaks at the sites immediately downstream of Turin and Milan, respectively, and in each case decreased progressively further downstream. Principal component analysis identified three major factors (from a multi-dimensional space of 35 variables) which explained 85-90% of the total observed variance. The first and second factors corresponded to anthropogenic inputs and geological factors on sediment quality; the third included seasonal processes of minor importance. Sediment quality assessment identified Cd, Cu, Hg, Pb, Zn and organic microcontaminants as posing the most serious threats to river sediment quality. A reference site within the Po basin provided useful background values. Moderate pollution by organochlorine compounds was ascribed both to local sources and to atmospheric deposition.

  4. PoPSat: The Polar Precipitation Satellite Mission

    Science.gov (United States)

    Binder, Matthias J.; Agten, Dries; Arago-Higueras, Nadia; Borderies, Mary; Diaz-Schümmer, Carlos; Jamali, Maryam; Jimenez-Lluva, David; Kiefer, Joshua; Larsson, Anna; Lopez-Gilabert, Lola; Mione, Michele; Mould, Toby JD; Pavesi, Sara; Roth, Georg; Tomicic, Maja

    2017-04-01

    The terrestrial water cycle is one of many unique regulatory systems on planet Earth. It is directly responsible for sustaining biological life on land and human populations by ensuring sustained crop yields. However, this delicate balanced system continues to be influenced significantly by a changing climate, which has had drastic impacts particularly on the polar regions. Precipitation is a key process in the weather and climate system, due to its storage, transport and release of latent heat in the atmosphere. It has been extensively investigated in low latitudes, in which detailed models have been established for weather prediction. However, a gap has been left in higher latitudes above 65°, which show the strongest response to climate changes and where increasing precipitations have been foreseen in the future. In order to establish a global perspective of atmospheric processes, space observation of high-latitude areas is crucial to produce globally consistent data. The increasing demand for those data has driven a critical need to devise a mission which fills the gaps in current climate models. The authors propose the Polar Precipitation Satellite (PoPSat), an innovative satellite mission to provide enhanced observation of light and medium precipitation, focusing on snowfall and light rain in high latitudes. PoPSat is the first mission aimed to provide high resolution 3D structural information about snow and light precipitation systems and cloud structure in the covered areas. The satellite is equipped with a dual band (Ka and W band) phased-array radar. These antennas provide a horizontal resolution of 2 km and 4 km respectively which will exceed all other observations made to date at high-latitudes, while providing the additional capability to monitor snowfall. The data gathered will be compatible and complementary with measurements made during previous missions. PoPSat has been designed to fly on a sun-synchronous, dawn-dusk orbit at 460 km. This orbit

  5. Thermodynamics and dynamical properties of the KH2PO4 type ferroelectric compounds. A unified model

    Directory of Open Access Journals (Sweden)

    R.R. Levitskii

    2009-01-01

    Full Text Available Within the framework of the proposed unified proton ordering model for the ferroelectric compounds of the KH2PO4 family, in the four-particle cluster approximation for the short-range interactions and mean field approximation for the long-range interactions, we calculate thermodynamic and longitudinal dynamic characteristics of the KD2PO4 type ferroelectrics and ND4D2PO4 type antiferroelectrics. Calculations for partially deuterated K(H1-xDx2PO4 type ferroelectrics and N(H1-xDx4(H1-xDx2PO4 type antiferroelectrics are performed within the mean crystal approximation. It is shown that at the proper choice of the theory parameters, a good quantitative description of experimental data for the KH2PO4 family crystals is obtained.

  6. Structural relationships among LiNaMg[PO4]F and Na2M[PO4]F (M = Mn-Ni, and Mg), and the magnetic structure of LiNaNi[PO4]F.

    Science.gov (United States)

    Ben Yahia, Hamdi; Shikano, Masahiro; Kobayashi, Hironori; Avdeev, Maxim; Liu, Samuel; Ling, Chris D

    2014-02-07

    The new compound LiNaMg[PO4]F has been synthesized by a wet chemical reaction route. Its crystal structure was determined from single-crystal X-ray diffraction data. LiNaMg[PO4]F crystallizes with the monoclinic pseudomerohedrally twinned LiNaNi[PO4]F structure, space group P2(1)/c, a = 6.772(4), b = 11.154(6), c = 5.021(3) Å, β = 90.00(1)° and Z = 4. The structure contains [MgO3F]n chains made up of zigzag edge-sharing MgO4F2 octahedra. These chains are interlinked by PO4 tetrahedra forming 2D-Mg[PO4]F layers. The alkali metal atoms are well ordered in between these layers over two atomic positions. The use of group-subgroup transformation schemes in the Bärnighausen formalism enabled us to determine precise phase transition mechanisms from LiNaNi[PO4]F- to Na2M[PO4]F-type structures (M = Mn-Ni, and Mg) (see video clip 1 and 2). The crystal and magnetic structure and properties of the parent LiNaNi[PO4]F phase were also studied by magnetometry and neutron powder diffraction. Despite the rather long interlayer distance, d(min)(Ni(+2)-Ni(+2)) ~ 6.8 Å, the material develops a long-range magnetic order below 5 K. The magnetic structure can be viewed as antiferromagnetically coupled ferromagnetic layers with moments parallel to the b-axis.

  7. Anisotropy of the proton kinetic energy in CsH2PO4 and KH2PO4

    Science.gov (United States)

    Finkelstein, Y.; Moreh, R.; Shchur, Ya.

    2018-02-01

    The strong anisotropy of the proton mean kinetic energy, Ke(H), in a single crystal of KH2PO4 (KDP), measured by deep inelastic neutron scattering (DINS), is compared with that calculated for its Cs analogue, CsH2PO4 (CDP) in the ferroelectric (FE) and paraelectric (PE) phases. Empirical lattice dynamics (LD) calculations were used to simulate the partial vibrational density of states shared by the protons (H-VDOS), from which Ke(H) values were deduced. Good agreement was found between the measured and calculated Ke(H) values of the two samples despite the different hydrogen bond dynamics. However, the directional components of Ke(H) in the two samples were quite different. In both cases, the Ke(H) tensor is nearly an ellipsoid of rotation: in KDP the shape is oblate around the major axis while being prolate in CDP. By resolving the directional Ke(H) values of the two non-equivalent protons of CDP, a possible signature of competing quantum effects is indicated.

  8. Study on preparation and performances of CDPVC/Ag3PO4 composite photocatalyst

    Directory of Open Access Journals (Sweden)

    Peng WANG

    2016-04-01

    Full Text Available PVC/Ag3PO4 composites are prepared by solution-dipping method, and the as-prepared composites are heat-treated to release HCl from PVC molecules to obtain conjugated derivative of PVC/Ag3PO4(CDPVC/Ag3PO4 composites. The CDPVC/Ag3PO4 composites are characterized by XRD, SEM, UV-vis DRS, PL and XPS. The effects of preparation conditions on the visible-light photocatalytic performances of CDPVC/Ag3PO4 composites are investigated by evaluating the decomposition of methyl orange under visible light irradiation. The results reveal that the modification of CDPVC is beneficial to the dispersion of Ag3PO4 particles, and it can obviously improve the absorbance of the CDPVC/Ag3PO4 composites in the range of visible light and the charge separation efficiency. The CDPVC/Ag3PO4 composites exhibit excellent visible-light photocatalytic acitivity and stability when the mass percentage of PVC to Ag3PO4, heat-treatment temperature and time are 0.03%, 130 ℃, and 2 h, respectively.

  9. Origin of Activity and Stability Enhancement for Ag3PO4 Photocatalyst after Calcination

    Directory of Open Access Journals (Sweden)

    Pengyu Dong

    2016-11-01

    Full Text Available Pristine Ag3PO4 microspheres were synthesized by a co-precipitation method, followed by being calcined at different temperatures to obtain a series of calcined Ag3PO4 photocatalysts. This work aims to investigate the origin of activity and stability enhancement for Ag3PO4 photocatalyst after calcination based on the systematical analyses of the structures, morphologies, chemical states of elements, oxygen defects, optical absorption properties, separation and transfer of photogenerated electron-hole pairs, and active species. The results indicate that oxygen vacancies (VO˙˙ are created and metallic silver nanoparticles (Ag NPs are formed by the reaction of partial Ag+ in Ag3PO4 semiconductor with the thermally excited electrons from Ag3PO4 and then deposited on the surface of Ag3PO4 microspheres during the calcination process. Among the calcined Ag3PO4 samples, the Ag3PO4-200 sample exhibits the best photocatalytic activity and greatly enhanced photocatalytic stability for photodegradation of methylene blue (MB solution under visible light irradiation. Oxygen vacancies play a significantly positive role in the enhancement of photocatalytic activity, while metallic Ag has a very important effect on improving the photocatalytic stability. Overall, the present work provides some powerful evidences and a deep understanding on the origin of activity and stability enhancement for the Ag3PO4 photocatalyst after calcination.

  10. 210Po and 210Pb in Forest Soil and in Wild Berries in Finland

    Science.gov (United States)

    Vaaramaa, Kaisa; Solatie, Dina; Aro, Lasse; Lehto, Jukka

    2008-08-01

    The behaviour of 210Po and 210Pb was investigated in forests in the Southern Finland site and in the Northern Finland site. Sampling sites were in Scots pine (Pinus sylvestris) forests. Maximum activities of 210Po and 210Pb in soil columns were found in organic layers. According to preliminary results of wild berry samples, the lowest 210Po concentrations were found in berries. The highest concentration of 210Po was found in stems of the blueberry (Vaccinium myrtillus) and the lingonberry (Vaccinium vitis-idaea) samples.

  11. Pushing the branch predictability limits with the multi-poTAGE+SC predictor

    OpenAIRE

    Michaud, Pierre; Seznec, André

    2014-01-01

    International audience; This paper describes the conditional branch predictor that the authors submitted to the unlimited-size track of the 4th Championship Branch Prediction. The multi-poTAGE+SC predictor which we submit combines the multi-poTAGE and TAGE-SC predictors that were submitted separately to CBP-4 by the first and second authors respectively. Both multi-poTAGE and TAGE-SC are based on the TAGE predictor. We combine them by replacing the TAGE component in TAGE-SC with the multi-poT...

  12. Annual effective dose of {sup 210}Po from sea food origin (Oysters and Mussels) in Korea

    Energy Technology Data Exchange (ETDEWEB)

    Cho, Bo Eum; Hong, Gi Hoon; Kim, Suk Hyun; Lee, Hyun Mi [Korea Institute of Ocean Science and Technology, Ansan (Korea, Republic of)

    2016-09-15

    Ingestion of {sup 210}Po laden seafood accounts for a substantial amount of the effective dose of {sup 210}Po. Among seafood items, mollusks, especially domestically produced oysters and mussels, are highly enriched in {sup 210}Po and are consumed in large quantities in Korea. Oysters and mussels around the Korean coasts were collected from major farm areas in November 2013. Samples were spiked with an aliquot of {sup 210}Po as a yield tracer, and they were digested with 6 mol·L{sup -1} HNO{sub 3} and H{sub 2}O{sub 2}. The {sup 210}Po and {sup 209}Po were spontaneously deposited onto a silver disc in an acidic solution of 0.5 mol·L{sup -1} HCl and measured using an alpha spectrometer. The activity concentrations of {sup 210}Pb and {sup 210}Po were decay corrected to the sampling date, accounting for the possible in-growth and decay of {sup 210}Po. {sup 210}Po activity concentrations in oysters were in a range from 41.3 to 206 Bq·(kg-ww{sup -1} and mussels in a range from 42.9 to 46.7 Bq·(kg-ww){sup -1}. The {sup 210}Po activity concentration of oysters in the turbid Western coast was higher than the Southern coast. The {sup 210}Po activity concentration of the oysters was positively correlated (R2=0.89) with those of the suspended particulate matter in the surface water. The calculated annual effective dose of {sup 210}Po from oysters and mussels consumed by the Korean population was 21-104 and 5.01-5.46 μSv·y{sup -1}. The combined effective dose due to the consumption of oysters and mussels appears to account for about 35±19% of that arising from seafood consumption in the Korean population. The annual effective dose of {sup 210}Po for oysters in the Korean population was found to be higher than other countries. The total annual effective dose of 210Po{sup 210}Po due to consumption of oysters and mussels consumed in Korea was found to be 76±42 μSv·y{sup -1}, accounting for 28±16% of the total effective dose of {sup 210}Po from food in Korea.

  13. Boj Evropske unije zoper terorizem po napadu na Charlie Hebdo

    OpenAIRE

    Knechtl, Jernej

    2016-01-01

    Evropska unija se sooča s hibridno teroristično grožnjo, ki deluje na več nivojih, kakršne do sedaj še ni doživela. Grožnjo povzročajo organizirani teroristi, izurjeni s strani Islamske države kot tudi posamezniki, ki so bili radikalizirani ali pa sami simpatizirajo z ideologijo Islamske države. Od maja 2014 do 14. julija 2016 je bilo na tleh EU izvršenih 13 islamistično motiviranih terorističnih napadov, od teh 9 v Franciji. V napadih je umrlo približno 270 oseb, več kot 900 je bilo poškodov...

  14. Magnetic phase diagram of magnetoelectric LiMnPO4

    DEFF Research Database (Denmark)

    Toft-Petersen, Rasmus; Andersen, Niels Hessel; Li, Haifeng

    2012-01-01

    The nature of the spin-flop (SF) transition in the magnetoelectric quasi-2D Heisenberg system LiMnPO4 is studied in fields applied along the a axis. A refinement of the magnetic structure using neutron diffraction data in the SF phase reveals that the spins reorient from being parallel...... to the a axis to be nearly along the c axis at magnetic fields between 4 and 4.7 T, depending on temperature. The low-field antiferromagnetic phase boundary is shown to join the spin-flop line tangentially at the so-called bicritical point, where there is a suppression of the ordering temperature....... At the bicritical field, we observe an increased intensity of the Lorentz broadened elastic scattering at magnetic Bragg peaks above TN as compared to zero field and 10 T, without an increase in peak width. This suggests an increased density of fluctuations at the bicritical field as compared to zero field....

  15. Nucleation and growth of new particles in Po Valley, Italy

    Directory of Open Access Journals (Sweden)

    A. Hamed

    2007-01-01

    Full Text Available Aerosol number distribution measurements are reported at San Pietro Capofiume (SPC station (44°39' N, 11°37' E for the time period 2002–2005. The station is located in Po Valley, the largest industrial, trading and agricultural area in Italy with a high population density. New particle formation was studied based on observations of the particle size distribution, meteorological and gas phase parameters. The nucleation events were classified according to the event clarity based on the particle number concentrations, and the particle formation and growth rates. Out of a total of 769 operational days from 2002 to 2005 clear events were detected on 36% of the days whilst 33% are clearly non-event days. The event frequency was high during spring and summer months with maximum values in May and July, whereas lower frequency was observed in winter and autumn months. The average particle formation and growth rates were estimated as ~6 cm−3 s−1 and ~7 nm h−1, respectively. Such high growth and formation rates are typical for polluted areas. Temperature, wind speed, solar radiation, SO2 and O3 concentrations were on average higher on nucleation days than on non-event days, whereas relative and absolute humidity and NO2 concentration were lower; however, seasonal differences were observed. Backtrajectory analysis suggests that during majority of nucleation event days, the air masses originate from northern to eastern directions. We also study previously developed nucleation event correlations with environmental variables and show that they predict Po Valley nucleation events with variable success.

  16. Giangiorgio Trissino, poète de l’empereur

    Directory of Open Access Journals (Sweden)

    Mercedes Blanco

    2012-06-01

    Full Text Available Cet article porte sur l’une des célébrités les plus méconnues de la Renaissance italienne, Giangiorgio Trissino (1478-1550 auteur d’un poème dédié à Charles-Quint, L’Italia liberata dai Goti (1547-1548, qui pose les bases d’un nouveau genre épique cultivé par des poètes de la seconde moitié du XVIe siècle, en Italie et en Espagne. Nous montrons que Trissino est un « poète de l’empereur » dans ses choix en tant que lettré, en tant qu’auteur de L’Italia liberata, et, à la fin de sa vie, lorsqu’il cherche la protection de Charles-Quint comme un asile, dès lors qu’il est amené par une tragédie familiale à rompre ses attaches avec Vicence, ville natale d’où il tenait sa fortune et son rang seigneurial. Le néo-classicisme d’un poème empreint de dévotion pour Homère se prête à l’expression de positions politiques et religieuses fort différentes de celles qui se généraliseront en Italie un peu plus tard, sous l’influence de la Contre-réforme. Charles-Quint se trouve au cœur de cette entreprise poétique. Trissino, suivant Aristote et s’inspirant de Virgile, réduit en fable une partie de la campagne ordonnée par Justinien pour conquérir l’Italie tenue par les Goths. Ainsi modifié, le matériau historique prend sens par l’allusion au rôle présumé libérateur de Charles-Quint en Italie.Este artículo trata de uno de los escritores más célebres y peor tratados por la crítica del Renacimiento italiano, Giangiorgio Trissino (1478-1550, autor de un poema épico dedicado a Carlos V, L’Italia liberata dai Goti (1547-1548, obra fundacional de un nuevo género heroico, cultivado por los poetas de la segunda mitad del XVI, en Italia y en España. Sostenemos que Trissino puede ser tenido por « poeta del emperador » a la vez en sus audaces posturas como hombre de letras e intelectual, en cuanto autor de L’Italia liberata y, al final de su vida, cuando buscó el amparo del emperador

  17. Baseline concentration of {sup 210}Po in Sargassum from the Northern Gulf

    Energy Technology Data Exchange (ETDEWEB)

    Uddin, S.; Bebhehani, M.; Talebi, L. [Kuwait Institute for Scientific Research (Kuwait)

    2014-07-01

    The concentration of the {sup 210}Po is of enormous interest because of its large contribution to the natural radiation dose received by marine organisms and human populations consuming seafood. In fact natural {sup 210}Po is responsible for higher radiation doses to humans consuming marine products than is plutonium and other man-made radionuclides. Many marine organisms are capable of concentrating {sup 210}Po in their tissues. {sup 210}Po is an alpha emitter in the {sup 238}U series, with 138-d half-life, that is supplied to seawater from atmospheric inputs and river runoff, however, the main source of {sup 210}Po in the environment is {sup 222}Rn exhalation from the ground. Assessing the impact of radionuclides in the environment requires the establishment of baseline levels in the environmental compartments. The objective of this study was to establish baseline levels in Sargassum. Two most common species of Sargassum found in the northern Gulf were analysed for {sup 210}Po. These macro-algae were collected from three different locations during January 2013. This study sets the baseline for {sup 210}Po concentration in northern Gulf, {sup 210}Po is absorbed from water and concentrated by Phytoplankton and macro-algae. This concentrated {sup 210}Po can then be passed along to the next trophic level of the marine food web. The {sup 210}Po concentration measured in Sargassum boveanum (4.405 - 4.952 BqKg{sup -1}) was significantly higher (p>0.084) than Sargassum oligocystum (3.838 - 4.358 BqKg{sup -1}). The {sup 210}Po concentration in these seaweeds from the Arabian/Persian Gulf were substantially lower than those found in various Phytoplankton and macro-algae species from other regions; this may be due to the lower background {sup 210}Po concentration in the Kuwait marine waters (0.282 - 0.382 mBq l{sup -1}). The {sup 210}Po concentrations in seawater measured at the 3 stations during January 2013 were less than those reported previously from the same region

  18. A high-temperature Raman scattering study of the phase transitions in GaPO{sub 4} and in the AlPO{sub 4}-GaPO{sub 4} system

    Energy Technology Data Exchange (ETDEWEB)

    Angot, E [Laboratoire des Colloides, des Verres et des Nanomateriaux, UMR CNRS 5587, Universite Montpellier II, cc026, Place E Bataillon, F-34095 Montpellier Cedex 5 (France); Parc, R Le [Laboratoire des Colloides, des Verres et des Nanomateriaux, UMR CNRS 5587, Universite Montpellier II, cc026, Place E Bataillon, F-34095 Montpellier Cedex 5 (France); Levelut, C [Laboratoire des Colloides, des Verres et des Nanomateriaux, UMR CNRS 5587, Universite Montpellier II, cc026, Place E Bataillon, F-34095 Montpellier Cedex 5 (France); Beaurain, M [Laboratoire de Physicochimie de la Matiere Condensee, UMR CNRS 5617, Universite Montpellier II, cc003, Place E Bataillon, F-34095 Montpellier Cedex 5 (France); Armand, P [Laboratoire de Physicochimie de la Matiere Condensee, UMR CNRS 5617, Universite Montpellier II, cc003, Place E Bataillon, F-34095 Montpellier Cedex 5 (France); Cambon, O [Laboratoire de Physicochimie de la Matiere Condensee, UMR CNRS 5617, Universite Montpellier II, cc003, Place E Bataillon, F-34095 Montpellier Cedex 5 (France); Haines, J [Laboratoire de Physicochimie de la Matiere Condensee, UMR CNRS 5617, Universite Montpellier II, cc003, Place E Bataillon, F-34095 Montpellier Cedex 5 (France)

    2006-05-03

    Al{sub 1-x}Ga{sub x}PO{sub 4} solid solutions (x = 0.2, 0.3, 0.38, 0.7) and the pure AlPO{sub 4} (x = 0) and GaPO{sub 4} (x = 1) end members with the {alpha}-quartz-type structure were studied by Raman scattering. An investigation as a function of composition enabled the various modes to be assigned, in particular coupled and decoupled vibrations. The tetrahedral tilting modes, which have been linked to high-temperature phase transitions to {beta}-quartz-type forms, were found to be decoupled. In addition, it is shown that Raman spectroscopy is a powerful technique for determining the gallium content of these solid solutions. Single crystals with x = 0.2, 0.38, and 1.0 (GaPO{sub 4}) were investigated at high temperature. The composition Al{sub 0.8}Ga{sub 0.2}PO{sub 4} was found to exhibit sequential transitions upon heating to the {beta}-quartz and {beta}-cristobalite forms at close to 993 K and 1073 K, respectively. Direct {alpha}-quartz-{beta}-cristobalite transitions were observed for the two other compositions at close to 1083 K and 1253 K, respectively, upon heating. The spectra of the {beta}-quartz and {beta}-cristobalite forms indicate the presence of significant disorder. Back transformation to the {alpha}-quartz-type form occurred readily with a hysteresis of less than 100 K for the composition x = 0.38 and for pure GaPO{sub 4}. Rapid cooling was necessary to obtain the metastable {alpha}-cristobalite form. In contrast, for Al{sub 0.80}Ga{sub 0.20}PO{sub 4}, the {alpha}-cristobalite form was obtained even upon slow cooling.

  19. Multi-year Surface Deposition of {sup 210}Pb and {sup 210}Po at Lisbon - Atmospheric Depositions of {sup 210}Pb and {sup 210}Po in Lisbon, Portugal

    Energy Technology Data Exchange (ETDEWEB)

    Carvalho, Fernando P.; Oliveira, Joao M.; Alberto, G. [Instituto Superior Tecnico/ Campus Tecnologico e Nuclear, Universidade Tecnica de Lisboa, E.N. 10, 2686-953 Sacavem (Portugal)

    2014-07-01

    The long lived radon daughters {sup 210}Pb and {sup 210}Po were determined in samples of total atmospheric depositions obtained with surface collectors continuously operated during 5 years, near Lisbon. The average annual {sup 210}Pb flux was 66±12 Bq m{sup -2}, and the average annual {sup 210}Po flux was 8±3 Bq m{sup -2}, with an overall {sup 210}Po/{sup 210}Pb activity ratio of 0.15±0.06. Direct determination of the {sup 210}Pb atmospheric flux was compared with the {sup 210}Pb excess determined in soil surface layers along with atmospheric depositions of {sup 137}Cs. The deposition of atmospheric {sup 210}Pb was positively correlated with seasonal rainfall, while {sup 210}Po was mainly originated in soil particles re-suspension throughout the year and also in seasonal forest fires. Unusually high {sup 210}Po/{sup 210}Pb activity ratios, higher than unity, were occasionally recorded in atmospheric depositions and the sources and causes are discussed. Long time-series of {sup 210}Pb and {sup 210}Po deposition fluxes, as presented herein are useful to test and constrain parameters of the atmospheric Global Circulation Models. (authors)

  20. Designing of luminescent GdPO4:Eu@LaPO4@SiO2 core/shell nanorods: Synthesis, structural and luminescence properties

    Science.gov (United States)

    Ansari, Anees A.; Labis, Joselito P.; Aslam Manthrammel, M.

    2017-09-01

    GdPO4:Eu3+ (core) and GdPO4:Eu@LaPO4 (core/shell) nanorods (NRs) were successfully prepared by urea based co-precipitation process at ambient conditions which was followed by coating with amorphous silica shell via the sol-gel chemical route. The role of surface coating on the crystal structure, crystallinity, morphology, solubility, surface chemistry and luminescence properties were well investigated by means of X-ray diffraction (XRD), transmission electron microscopy (TEM), energy dispersive X-ray (EDX) analysis, Fourier Transform Infrared (FTIR), UV-Vis, and photoluminescence spectroscopy. XRD pattern revealed highly purified, well-crystalline, single phase-hexagonal-rhabdophane structure of GdPO4 crystal. The TEM micrographs exhibited highly crystalline and narrow size distributed rod-shaped GdPO4:Eu3+ nanostructures with average width 14-16 nm and typical length 190-220 nm. FTIR spectra revealed characteristic infrared absorption bands of amorphous silica. High absorbance in a visible region of silica modified core/shell/Si NRs in aqueous environment suggests the high solubility along with colloidal stability. The photoluminescence properties were remarkably enhanced after growth of undoped LaPO4 layers due to the reduction of nonradiative transition rate. The advantages of presented high emission intensity and high solubility of core/shell and core/shell/Si NRs indicated the potential applications in monitoring biological events.

  1. 76 FR 54931 - Post Office (PO) Box Fee Groups for Merged Locations

    Science.gov (United States)

    2011-09-06

    ... 111 Post Office (PO) Box Fee Groups for Merged Locations AGENCY: Postal Service TM . ACTION: Final..., Domestic Mail Manual (DMM ) 508.4 to allow Post Office Box TM (PO Box TM ) fee groups to be merged due to... lower, and only once per calendar year. Absent this change, where a box section is merged with a...

  2. Influence of fluid resuscitation on renal microvascular PO2 in a normotensive rat model of endotoxemia

    NARCIS (Netherlands)

    Johannes, Tanja; Mik, Egbert G.; Nohé, Boris; Raat, Nicolaas J. H.; Unertl, Klaus E.; Ince, Can

    2006-01-01

    INTRODUCTION: Septic renal failure is often seen in the intensive care unit but its pathogenesis is only partly understood. This study, performed in a normotensive rat model of endotoxemia, tests the hypotheses that endotoxemia impairs renal microvascular PO2 (microPO2) and oxygen consumption

  3. Applying LaPO4 Phosphor via Spinning for BetaPhotovoltaic Devices

    Science.gov (United States)

    2015-06-01

    ARL-TR-7269 ● JUN 2015 US Army Research Laboratory Applying LaPO4 Phosphor via Spinning for BetaPhotovoltaic Devices by...Laboratory Applying LaPO4 Phosphor via Spinning for BetaPhotovoltaic Devices by Muhammad R Khan, Joshua R Smith, Kevin Kirchner, and Kenneth...

  4. Crystal morphology of ADP (NH4H2PO4) : A qualitative approach

    NARCIS (Netherlands)

    Aguilo, M.; Woensdregt, C.F.

    1984-01-01

    The Hartman-Perdok theory enables one to establish the order of morphological importance of the ADP (NH4H2PO4) crystal faces from its crystal structure. Periodic Bond Chains (PBC's) have been obtained using the N−HN…O strong bonds between the ionic [NH4]+ and [H2PO4]- crystallization units. The

  5. PoD: dynamically create and use remote PROOF clusters. A thin client concept.

    CERN Multimedia

    CERN. Geneva

    2012-01-01

    PoD’s newly developed “pod-remote” command made it possible for users to utilize a thin client concept. In order to create dynamic PROOF clusters, users are now able to select a remote computer, even behind a firewall, to control a PoD server on...

  6. Study on feed forward neural network convex optimization for LiFePO4 battery parameters

    Science.gov (United States)

    Liu, Xuepeng; Zhao, Dongmei

    2017-08-01

    Based on the modern facility agriculture automatic walking equipment LiFePO4 Battery, the parameter identification of LiFePO4 Battery is analyzed. An improved method for the process model of li battery is proposed, and the on-line estimation algorithm is presented. The parameters of the battery are identified using feed forward network neural convex optimization algorithm.

  7. Igor’ Šajtanov, Komparativistika i/ili poètika

    Directory of Open Access Journals (Sweden)

    Elizaveta Illarionova

    2012-06-01

    Full Text Available Recensiamo il libro di Igor’ Šajtanov Komparativistika i/ili poètika. Anglijskie sjužety glazami istoričeskoj poètiki [Comparatistica e/o poetica. Intrecci inglesi agli occhi della poetica storica]. Moskva: RGGU, 2010.

  8. Supervalent doping of LiFePO4 for enhanced electrochemical performance

    Directory of Open Access Journals (Sweden)

    N. V. Kosova

    2015-12-01

    Full Text Available The orthophosphates LiFe0.9M0.1PO4 with the structure of olivine doped with vanadium and titanium were obtained by mechanochemically stimulated solidphase synthesis using high-energy planetary mill AGO-2 and subsequent annealing at 750 °C. It is shown that V- and Ti- ions do not completely substitute for Fe2+ ions in the LiFePO4 structure. The remaining part of these ions involve in the formation of second phase with nashiko-like structure: monoclinic Li3V2(PO43 (space group P21/n and rhombohedral LiTi2(PO43 (space group R-3c. According to TEM, the average size of the particle of nanocomposites is about 100-300 nm. EMF of microanalysis showed that the small particles of secondary phases are segregated at the surface of larger particles of LiFePO4. On the charge-discharge curves of LiFe0.9M0.1PO4 there are plateau corresponding to LiFePO4 and the second phase. The doping with vanadium increases the resistance of the cycling of LiFePO4 and improves its cyclability at high speeds to a greater extent than in the case of doping with titanium.

  9. Ce and Eu activated Na2 Zn5 (PO4 )4 , a new promising novel ...

    Indian Academy of Sciences (India)

    Administrator

    activated Na2Zn5(PO4)4 has been synthesized by solid-state reaction technique at high temperature. X-ray powder diffraction analysis confirmed the formation of Na2Zn5(PO4)4 host lattice. Scanning electron microscopy indicated that the microstructure of the phosphor consisted of irregular fine grains with a size of about ...

  10. The effect of heat preservation time on the electrochemical properties of LiFePO4

    Science.gov (United States)

    He, Rui; Zhang, Lihui; Bai, Xue; Liu, Zhenfa

    2017-12-01

    LiFePO4 was prepared via high temperature solid-state method at different heat preservation time. XRD and SEM was used to test the structure and morphology of LiFePO4. Land 2001 was used to test the electrochemical performance of LiFePO4. The results illustrated that well-crystallized LiFePO4 composite with homogeneous small particles was obtained by XRD and SEM. And the optimum heat preservation time was 4 hour. From charge/discharge test, it can be seen that at 0.2C, LiFePO4 has initial discharge capacities of 159.1mAh/g at the heat preservation time 4 hour. From the rate capacity, it can be seen that the discharge capacity was of optimum sample remains above 99% after 200 cycles.

  11. Vapour phase oxidation of toluene over CeAlPO-5 molecular sieves.

    Science.gov (United States)

    Devika, S; Sundaravel, B; Palanichamy, M; Murugesan, V

    2014-04-01

    Single-site CeAlPO-5 with Al/Ce ratios 25, 50, 75, 100 and 125 were synthesized hydrothermally in fluoride medium. The XRD patterns of CeAlPO-5 exhibited characteristic reflections of AlPO-5. 27Al MAS-NMR of CeAIPO-5(25) showed two unusual peaks at -20.78 and -71.35 ppm due to delocalization of cerium unpaired electron. However, 31P MAS-NMR exhibited the usual characteristic peak similar to that of AlPO-5. Vapour phase oxidation of toluene in air over CeAlPO-5 yielded benzaldehyde with high toluene conversion. The time on stream study established the stability of the catalyst. This catalyst can also be used for the selective oxidation of other alkyl aromatics.

  12. Infrared-active optical phonons in LiFePO4 single crystals

    Science.gov (United States)

    Stanislavchuk, T. N.; Middlemiss, D. S.; Syzdek, J. S.; Janssen, Y.; Basistyy, R.; Sirenko, A. A.; Khalifah, P. G.; Grey, C. P.; Kostecki, R.

    2017-07-01

    Infrared-active optical phonons were studied in olivine LiFePO4 oriented single crystals by means of both rotating analyzer and rotating compensator spectroscopic ellipsometry in the spectral range between 50 and 1400 cm-1. The eigenfrequencies, oscillator strengths, and broadenings of the phonon modes were determined from fits of the anisotropic harmonic oscillator model to the data. Optical phonons in a heterosite FePO4 crystal were measured from the delithiated ab-surface of the LiFePO4 crystal and compared with the phonon modes of the latter. Good agreement was found between experimental data and the results of solid-state hybrid density functional theory calculations for the phonon modes in both LiFePO4 and FePO4.

  13. Početnica hrvatskoga jezika – temeljni školski udžbenik

    OpenAIRE

    Mendeš, Branimir

    2009-01-01

    U radu se razmatra karakter početnice hrvatskoga jezika kao temeljnoga školskog udžbenika za uvođenje učenika prvog razreda osnovne škole u početno čitanje i pisanje. Naglasak se stavlja na didaktičko - metodičku koncepciju početnice hrvatskoga jezika te se obrazlažu metodička rješenja početne nastave čitanja i pisanja (metodički pristup svladavanju početnoga čitanja i pisanja, redoslijed svladavanja slova, postupci obradbe slova, vrsta tiskanih slova i tehnika rukopisnih slova) koja su zastu...

  14. Structure and mobility of water confined in AlPO4-54 nanotubes.

    Science.gov (United States)

    Gavazzoni, Cristina; Giovambattista, Nicolas; Netz, Paulo A; Barbosa, Marcia C

    2017-06-21

    We performed molecular dynamics simulations of water confined within AlPO4-54 nanotubes. AlPO4-54 is an artificial material made of AlO4 and of PO4 in tetrahedra arranged in a periodic structure forming pores of approximately 1.3 nm in diameter. This makes AlPO4-54 an excellent candidate for practical applications, such as for water filtration and desalination. In this work, the structural and dynamical properties of the confined water are analyzed for various temperatures and water loadings. We find that the water structure is controlled by the heterogeneity of the nanopore surface with the water molecules located preferentially next to the surface of oxygens of AlPO4-54; consequently, at very low densities, water forms helicoidal structures in string-like arrangements.

  15. Low-temperature coprecipitation synthesis and luminescent properties of LaPO(4):Ln(3+) (Ln(3+) = Ce(3+), Tb(3+)) nanowires and LaPO(4):Ce(3+),Tb(3+)/LaPO(4) core/shell nanowires.

    Science.gov (United States)

    Yang, Mei; You, Hongpeng; Liu, Kai; Zheng, Yuhua; Guo, Ning; Zhang, Hongjie

    2010-06-07

    LaPO(4):Ln(3+) (Ln(3+)= Ce(3+), Tb(3+)) and LaPO(4):Ce(3+),Tb(3+)/LaPO(4) core/shell nanowires have been synthesized on a large scale through a direct precipitation in a water-based system under moderate conditions without the assistance of any surfactant, catalyst, or template. The diameters of the obtained nanowires are about 15 nm, and the lengths range from a few hundred nanometers to several micrometers. The influences of the solution acidity, reaction time, and proportion of ethanol to water on the final products were investigated in detail. It was found that the lengths of nanowires can be efficiently controlled by adjusting the reaction conditions. The formation mechanism of the products is proposed on the basis of time-dependent experiments as well as the crystal structure of the products. The luminescent properties of the products were also studied. A LaPO(4) shell on the LaPO(4):Ce(3+),Tb(3+) nanowires can greatly increase the intensity of the product, and the thickness of the shell also has an important effect on the intensity of the product. The method is a novel and facile route for the synthesis of one-dimensional lanthanide phosphates.

  16. Solvothermal synthesis of Ag hybrid BiPO4 heterostructures with enhanced photodegradation activity and stability.

    Science.gov (United States)

    Huang, Chang-Wei; Wu, Mei-Yao; Lin, Yang-Wei

    2017-03-15

    In this study, Ag hybrid BiPO4 (Ag/BiPO4) heterostructures were synthesized using a solvothermal method. The morphologies and optical properties of the Ag/BiPO4 heterostructures were drastically different from those of BiPO4 and were highly dependent on the AgNO3:BiPO4 weight percent during the synthesis. The three formulated heterostructures were evaluated for their photocatalytic degradation of methylene blue (MB) under UV light illumination; the 0.5%Ag/BiPO4 heterostructure was observed to result in 99% degradation of MB within 60min, a remarkably higher level of photodegradation activity than the levels caused by TiO2 and BiPO4. Furthermore, even after use for five cycles of MB degradation, the 0.5%Ag/BiPO4 heterostructure showed no observable loss in photodegradation activity and no change in XRD patterns, demonstrating its chemical and structural stability. According to the results of a systematic experimental investigation, the enhanced photodegradation activity of this Ag/BiPO4 heterostructure could be ascribed to the high position of its valence band and the highly efficient separation of photogenerated electrons and holes. Moreover, hydroxyl radicals and holes were found to be the major reactive species. Successful photodegradation of standard dye solutions, including acid blue 1, methyl orange, fast green, rhodamine B, rhodamine 6G, and MB, in real water samples was demonstrated with the 0.5%Ag/BiPO4 heterostructure, providing clear evidence of its utility for treating waste water containing organic dyes. Copyright © 2016 Elsevier Inc. All rights reserved.

  17. Removal of lead from crude antimony by using NaPo3 as lead elimination reagent

    Directory of Open Access Journals (Sweden)

    Ye L.G.

    2015-01-01

    Full Text Available In order to solve the shortcomings when removing lead from crude antimony in the traditional antimony smelting, a new process was provided using NaPO3 as lead elimination reagent to yield phosphate slag, and it was removed by floating on the surface of the liquid antimony. Reaction mechanism was clarified by using the TG-DTA and XRD techniques and single factor experiments of removal lead from crude antimony were engaged. The results show that PbO and NaPO3 begin endothermic reaction at 863K (590°C, and the reaction mainly form NaPb4(PO43 and NaPbPO4 below 1123K (850°C and above 1123K (850°C, respectively. Sb2O3 and NaPO3 start the reaction at 773K (500°C and generate an antimonic salt compound. The reaction product of the mixture of PbO, Sb2O3 and NaPO3 show that NaPO3 reacted with PbO prior when NaPO3 was insufficient, amorphous antimony glass will be generated only when NaPO3 was adequate. Single factor experiments were taken with NaNO3 as oxidizing agent under argon, effect of reaction time, reaction temperature and dosage of NaPO3 and NaNO3 on smelting results. The average content of lead in refined antimony was 0.05340% and 98.85% of lead were removed under optimal conditions; the content of lead in antimony have meet the requirements of commercial antimony.

  18. Implementing DOIs for Oceanographic Satellite Data at PO.DAAC

    Science.gov (United States)

    Hausman, J.; Tauer, E.; Chung, N.; Chen, C.; Moroni, D. F.

    2013-12-01

    The Physical Oceanographic Distributed Active Archive Center (PO.DAAC) is NASA's archive for physical oceanographic satellite data. It distributes over 500 datasets from gravity, ocean wind, sea surface topography, sea ice, ocean currents, salinity, and sea surface temperature satellite missions. A dataset is a collection of granules/files that share the same mission/project, versioning, processing level, spatial, and temporal characteristics. The large number of datasets is partially due to the number of satellite missions, but mostly because a single satellite mission typically has multiple versions or even temporal and spatial resolutions of data. As a result, a user might mistake one dataset for a different dataset from the same satellite mission. Due to the PO.DAAC'S vast variety and volume of data and growing requirements to report dataset usage, it has begun implementing DOIs for the datasets it archives and distributes. However, this was not as simple as registering a name for a DOI and providing a URL. Before implementing DOIs multiple questions needed to be answered. What are the sponsor and end-user expectations regarding DOIs? At what level does a DOI get assigned (dataset, file/granule)? Do all data get a DOI, or only selected data? How do we create a DOI? How do we create landing pages and manage them? What changes need to be made to the data archive, life cycle policy and web portal to accommodate DOIs? What if the data also exists at another archive and a DOI already exists? How is a DOI included if the data were obtained via a subsetting tool? How does a researcher or author provide a unique, definitive reference (standard citation) for a given dataset? This presentation will discuss how these questions were answered through changes in policy, process, and system design. Implementing DOIs is not a trivial undertaking, but as DOIs are rapidly becoming the de facto approach, it is worth the effort. Researchers have historically referenced the source

  19. LiFePO4 Nanostructures Fabricated from Iron(III) Phosphate (FePO4 x 2H2O) by Hydrothermal Method.

    Science.gov (United States)

    Saji, Viswanathan S; Song, Hyun-Kon

    2015-01-01

    Electrode materials having nanometer scale dimensions are expected to have property enhancements due to enhanced surface area and mass/charge transport kinetics. This is particularly relevant to intrinsically low electronically conductive materials such as lithium iron phosphate (LiFePO4), which is of recent research interest as a high performance intercalation electrode material for Li-ion batteries. Many of the reported works on LiFePO4 synthesis are unattractive either due to the high cost of raw materials or due to the complex synthesis technique. In this direction, synthesis of LiFePO4 directly from inexpensive FePO4 shows promise.The present study reports LiFePO4 nanostructures prepared from iron (III) phosphate (FePO4 x 2H2O) by precipitation-hydrothermal method. The sintered powder was characterized by X-ray diffractometry (XRD), X-ray photoelectron spectroscopy (XPS), Inductive coupled plasma-optical emission spectroscopy (ICP-OES), and Electron microscopy (SEM and TEM). Two synthesis methods, viz. bulk synthesis and anodized aluminum oxide (AAO) template-assisted synthesis are reported. By bulk synthesis, micro-sized particles having peculiar surface nanostructuring were formed at precipitation pH of 6.0 to 7.5 whereas typical nanosized LiFePO4 resulted at pH ≥ 8.0. An in-situ precipitation strategy inside the pores of AAO utilizing the spin coating was utilized for the AAO-template-assisted synthesis. The template with pores filled with the precipitate was subsequently subjected to hydrothermal process and high temperature sintering to fabricate compact rod-like structures.

  20. Prevođenje po ključu

    Directory of Open Access Journals (Sweden)

    Tomislav Kuzmanović

    2011-12-01

    Full Text Available Krajem 2009. godine pisac i urednik Roman Simić Bodrožić kontaktirao me s prijedlogom da napravim nekoliko prijevoda i pošaljem ih kao moguće priloge za antologiju pod nazivom Best European Fiction 2012 u izdanju američke izdavačke kuće Dalkey Archive Press. Prijedlog sam, naravno, prihvatio premda mi ovo nije bilo prvi put da šaljem prijevode za spomenutu antologiju. Međutim, moji prijašnji prijevodi nažalost nisu prošli uredničku selekciju te nisu bili uvršteni u prethodna izdanja antologije, odnosno serije antologija čije je prvo izdanje objavljeno 2010. godine, a čiji je urednik priznati američki pisac bosanskog porijekla, Aleksandar Hemon. U njenim prijašnjim izdanjima našli su se tekstovi Nevena Ušumovića, Mime Simić, Igora Štiksa te nekolicine autora s područja bivše Jugoslavije poput Davida Albaharija, Andreja Blatnika, Vladimira Arsenijevića ili Gorana Samardžića, drugim riječima, tekstovi istaknutijih suvremenih pisaca s prostora bivše Jugoslavije koji zajedno s tekstovima drugih europskih pisaca čine vrlo zanimljivu i raznoliku panoramu suvremene književne produkcije u Europi.

  1. Doppler radar wind field retrieval over the Po Valley

    Directory of Open Access Journals (Sweden)

    Y. K. Goh

    2006-01-01

    Full Text Available Although methods of using multiple Doppler radars to study wind fields have long been proposed, and many research studies have been made, very few operational radar operators adopt methods which require the use of specific scanning strategies to allow the extraction of wind information. Here we report a collaborative study on dual-Doppler radars based on two Doppler radars in the Po valley, Italy. Unusually, the radars are only about 90 km apart, though operated by the same authority. The wind field syntheses are carried out on a 30 km by 30 km region where the two radars have overlapping scan coverage. An iterative method based on the linear wind model and the equation of mass continuity is used to construct the wind fields. The methodology has been validated by two different methods. The first method is to reconstruct the radial wind observed by each radar, and the second method is calculating and comparing the along-track component with that derived from the observations. Both two comparisons show good agreement with the original data.

  2. New Media E/PO: Building a Digital Astronomy Community

    Science.gov (United States)

    Gay, Pamela L.

    2008-05-01

    Today's communications landscape is rich with new technologies. Cell phones and laptops are the constant companions of content consumers, and as we plan tomorrow's Education and Public Outreach programs, we need to consider how to most effectively utilize these technologies with their new, dynamic content possibilities - We need to use New Media. The field of New Media includes dynamic content sites such as: blogs, pod/vodcasts, Flickr, Facebook, Ustream, Twitter, and Second Life. The first part of this talk will summarize what New Media is available in the field of astronomy. All new media technologies have one thing in common: Users can easily create and input their own content and/or comments. These new media users and content contributors can just as easily be professional researchers, E/PO professionals, amateur astronomers, stay-at-home parents, and school kids. All are welcome in the online community, and today, all voices are digitally joined in the cacophony of astronomy new media content. This rich diversity supports many opportunities for learning, mentoring, content distribution, and discussion of ideas (including the debunking of bad ideas). In the second half of this talk, ways to use new media to build a community that shares, promotes, and comments on content is discussed, and techniques for dealing with the high flux of content are outlined. Also covered are the considerations that need to be made to make content as broadly accessible as possible.

  3. Performing Organization Sebuah Format Pengembangan Organisasional (PO Dalam Era Perubahan

    Directory of Open Access Journals (Sweden)

    Noor Arifin

    2009-08-01

    Full Text Available Ciri utama organisasi masa depan menurut Alfin Tofler adalah fleksibilitas, kreativitas, dan inovasi (enterpreneurship. Apa yang harus dilakukan oleh manajemen agar organisasi yang dipimpinnnya mampu mem¬pertahankan eksistensinya dalam gelombang perubahan tersebut? Perubahan di masa depan akan semakin dahsyat dan radikal, menembus ke segala segi kehidupan. Para anggota dan pimpinan organisasional pada se¬mua jajarannya akan dituntut kerja keras, dibarengi dengan menciptakan metode yang mutakhir, teknologi tinggi yang canggih, prosedur yang ringkas dan jelas, perumusan kebijaksanaan yang transparan dan selalu member¬dayakan karyawan (employee empowerment.Format PO masa depan yang bisa survive terhadap perubahan adalah Performing Organizational yang senantiasa menciptakan strategi kecocokan (fit terhadap gejolak internal dan eksternal.Indonesia dalam menghadapi krisis sekarang perlu mencari solusi terbaik dan menyiapkan untuk menghadapi perdagangan bebas dunia. Untuk jangka pendek Indonesia perlu perubahan transformasi organi¬sasional (yang dilakukan secara radikal dengan benar agar krisis dapat berlalu. Namun untuk jangka panjang perlu mengkombinasikan perubahan internal dan mengantisipasi perubahan eksternal dengan menerapkan kon¬sep Performing Organizational. Konsep ini dapat dilaksanakan jika memang situasi dan kondisi memungkinkan, sehingga pendekatan yang dilakukan adalah contingency atau situasional.

  4. Interface Synthesis of FePO4 with Different Morphologies and Effect of Morphology on the Electrochemical Performance of LiFePO4/C

    Directory of Open Access Journals (Sweden)

    Luo Y.-H.

    2015-07-01

    Full Text Available In our work, interface synthesis method was put forward to prepare FePO4 with different morphologies, and the effect of morphology on the preparation and electrochemical performance of LiFePO4/C was investigated. The results showed that the morphology of FePO4 was amorphous and monoclinic at the treatment temperatures of 30 °C and 80 °C, respectively. LiFePO4/C prepared from two crystal precursors were both hemispherical hollow with an olivine crystal structure. LiFePO4/C produced from the monoclinic structured precursor exhibited smaller- sized morphology and better electrochemical performance, and its discharge capacities were 155.9 mA h g−1 and 141.8 mA h g−1 at the rates of 0.1 C and 1 C, respectively. After 150 cycles, its capacity retention was about 97.8 % and 95.1 % at 0.1 C and 1 C, respectively

  5. $^{206}$ Po sources for production and release studies relevant for high power spallation targets

    CERN Multimedia

    The knowledge of the evaporation behaviour of Po is of essential importance for several scientific and technological applications, like accelerator driven systems (ADS) or the LIEBE project at CERN-ISOLDE. Fundamental investigations on the experimental conditions for the formation of volatile Po species as well as on the chemical composition of the volatile compounds are necessary for a safe operation of such facilities. $^{206}$Po, a mainly $\\gamma$- ray-emitting Po isotope with a half-life of 8.8 d, is best suited for model studies, due to the lower radiation hazard compared to the longer-lived $\\alpha$-emitting isotopes $^{208-210}$Po as well as the easy-to-measure $\\gamma$-ray emission. We propose the production of $^{206}$Po samples in several matrices via the implantation of its precursor $^{210}$Fr into selected metal foils at CERN-ISOLDE. Using these samples, experiments will be carried out at PSI studying the volatilization of Po from different matrices under varying chemical conditions.

  6. Electrochemical performance of Sol-Gel synthesized LiFePO{sub 4} in lithium batteries

    Energy Technology Data Exchange (ETDEWEB)

    Hu, Yaoqin; Doeff, Marca M.; Kostecki, Robert; Finones, Rita

    2003-06-16

    LiFePO{sub 4}, Li{sub 0.98}Mg{sub 0.01}FePO{sub 4}, and Li{sub 0.96}Ti{sub 0.01}FePO{sub 4} were synthesized via a sol-gel method, using a variety of processing conditions. For comparison, LiFePO{sub 4} was also synthesized from iron acetate by a solid state method. The electrochemical performance of these materials in lithium cells was evaluated and correlated to mean primary particle size and residual carbon structure in the LiFePO{sub 4} samples, as determined by Raman microprobe spectroscopy. For materials with mean agglomerate sizes below 20 {micro}m, an association between structure and crystallinity of the residual carbon and improved utilization was observed. Addition of small amounts of organic compounds or polymers during processing results in carbon coatings with higher graphitization ratios and better electronic properties on the LiFePO{sub 4} samples and improves cell performance in some cases, even though total carbon contents remain very low (<2%). In contrast, no performance enhancement was seen for samples doped with Mg or Ti. These results suggest that it should be possible to design high power LiFePO{sub 4} electrodes without unduly compromising energy density by optimizing the carbon coating on the particles.

  7. Connected Lighting Systems Efficiency Study$-$ PoE Cable Energy Losses, Part 1

    Energy Technology Data Exchange (ETDEWEB)

    Tuenge, Jason [Pacific Northwest National Lab. (PNNL), Richland, WA (United States); Kelly, Karsten [Pacific Northwest National Lab. (PNNL), Richland, WA (United States); Poplawski, Michael [Pacific Northwest National Lab. (PNNL), Richland, WA (United States)

    2017-11-30

    First report in a study of the efficiency of connected lighting systems. The report summarizes the results of an exploratory study investigating power losses in Ethernet cables used between PoE switches and luminaires in PoE connected lighting systems. Testing was conducted at the Pacific Northwest National Laboratory (PNNL) Connected Lighting Test Bed in September 2017. The results were analyzed to explore the impact of cable selection on PoE lighting system energy efficiency, as well as the effectiveness of guidelines recently introduced by the American National Standards Institute (ANSI) C137 Lighting Systems Committee.

  8. Is ecological food also radioecological? - 210Po and 210Pb studies.

    Science.gov (United States)

    Strumińska-Parulska, Dagmara; Olszewski, Grzegorz

    2018-01-01

    Presented are results of a study on accumulation of naturally occurring 210Po and 210Pb in ecological and conventional farming food products in Poland: fruits, vegetables and cereals. The main idea behind this research was to determine the activity concentrations of 210Po and 210Pb in ecological and commercial food as well as calculate and compare the effective dose (radiation) connected to different origin of analyzed food products consumption. The studies showed the majority of all compared food samples contained similar 210Po and 210Pb activities and statistically, the consumption of organic and commercial food would give similar annual effective dose. Copyright © 2017 Elsevier Ltd. All rights reserved.

  9. O concerto dissonante da modernidade: narrativa poética e poesia em prosa

    OpenAIRE

    Pires, Antônio Donizeti [UNESP

    2006-01-01

    O presente trabalho parte da discussão preliminar de conceitos dúbios da teoria da poesia lírica e da teoria da narrativa para, em seguida, investigar e conceituar a narrativa poética, considerando-a, ao lado da poesia em prosa – pelas muitas possibilidades de construção e recepção que encetam – como forma privilegiada da modernidade literária. Palavras-chave: Poesia. Prosa. Poesia em prosa. Prosa poética. Narrativa poética. Gêneros literários. Modernidade. 

  10. Vartotojų požiūris į humorą reklamoje

    OpenAIRE

    Janionienė, Iglė

    2014-01-01

    Pirmoje darbo dalyje pateikiama reklamos samprata ir esmė, apibrėžiamos reklamos vartotojų charakteristikos, identifikuojami jos poveikio vartotojui elementai. Taip pat, pateikiama vartotojų požiūrio ir humoro samprata bei identifikuojami veiksniai, formuojantys vartotojų požiūrį į humorą reklamoje. Antroje darbo dalyje, remiantis anksčiau atliktais tyrimais, pateikiamas veiksnių, formuojančių vartotojų požiūrį į humorą reklamoje teorinis modelis, aptariami Lietuvoje ir užsienyje atlikti tyri...

  11. 210Po and 210Pb disequilibrium at the PN section in the East China Sea.

    Science.gov (United States)

    Su, Kaijun; Du, Jinzhou; Baskaran, Mark; Zhang, Jing

    2017-08-01

    Lead-210 and 210Po have been widely used as tracers for quantifying particulate scavenging in the upper layer of the oceanic water column. In this study, we investigated the 210Po/210Pb disequilibrium in the water column of the PN section in the East China Sea (ECS) during autumn 2013. In most of the water column, a deficiency of 210Po was observed with respect to its parent nuclide 210Pb (i.e., a 210Po/210Pb activity ratio < 1.0). The (210Po/210Pb)dissolved, (210Po/210Pb)particulate and (210Po/210Pb)total activity ratios ranged from 0.29 to 0.71 (average: 0.53 ± 0.13, n = 27), 0.31 to 1.42 (average: 0.70 ± 0.27, n = 27) and 0.22 to 0.62 (average: 0.50 ± 0.12, n = 27), respectively. The distribution coefficients (Kd) of 210Po and 210Pb were 12.1× 104 ml g-1 and 8.8× 104 ml g-1, with an average (210Po/210Pb) total activity ratio of (0.50 ± 0.12, n = 27). However, over the continental shelf, planktonic detritus and fecal pellets appear to be the main carriers for 210Po, which preferentially scavenges 210Po and produces a lower (210Po/210Pb) total activity ratio (0.49 ± 0.12, n = 22) with a Kd for 210Po of 13.8× 104 ml g-1 in the water column. The variations in the fractionation factor (1.48 ± 0.66) of 210Po/210Pb reveal distinct differences between the distribution and scavenging of 210Po and 210Pb by particulate matter in different marine environments: in the estuarine zone (a high turbidity area), terrigenous suspended particulate matter scavenges 210Pb from the water column, while in areas dominated by biogenic particular matter, 210Po is preferentially scavenged from the water column. Using the 210Po/210Pb disequilibrium in the water column, we estimated the removal fluxes of POC from the upper waters downward to be 25.0 mg C m-2 d-1, comparable to those in other marginal seas. Moreover, a decreasing trend of POC removal fluxes was observed with increasing distance offshore. Copyright © 2016 Elsevier Ltd. All rights

  12. Concentration of {sup 210}Po in the hair of Brazilian population; Teores de {sup 210}Po no cabelo da populacao brasileira

    Energy Technology Data Exchange (ETDEWEB)

    Kelecom, Alphonse; Gouvea, Rita C.S.; Santos, Pedro L. [Universidade Federal Fluminense, Niteroi, RJ (Brazil). Dept. de Biologia Geral. Lab. de Radiobiologia e Radiometria

    2000-07-01

    {sup 210}Po concentrations have been determined in the hair of 118 people (57 women and 61 men), whose ages ranged from 8 to 90 years (mean: 39y). {sup 210}Po levels varied from 2,15 mBq.g{sup -1} for a medium long-haired female nonsmoker to 38,33 mBq.g{sup -1} for a 65 cigarettes-a-day male smoker (66 years old) whose diet is rich in fish. The overall mean concentration of {sup 210}Po in hair was of 7,39{+-}5,13 mBq.g{sup -1}, and was slightly higher for men (8,37{+-}6,11 mBq.g{sup -1}) than for women (6,34{+-}3,57 mBq.g{sup -1}). (author)

  13. Une poétique de la science :

    Directory of Open Access Journals (Sweden)

    Pierre Macherey

    2006-05-01

    Full Text Available L’article présente l’ouvrage de Fernand Hallyn, Les structures rhétoriques de la science de Kepler à Maxwell (éd. Seuil, 2004, où sont explorées les formes d’imaginaire théorique qui se développent à la limite entre pratiques littéraires et pratiques scientifiques. Sans prendre le risque d’en faire rentrer les vérités dans une perspective relativiste au point de vue de laquelle la science ne serait qu’une manière particulière de mettre le réel en récit, cette démarche apporte un précieux éclairage sur le processus de la science non déjà toute faite mais en train de se faire, où interviennent, entre autres, des modèles repris à la rhétorique et à la poétique. Ceci pris en compte, on est amené à renoncer à l’idée selon laquelle la connaissance scientifique parviendrait tout d’un coup à des vérités nues, dépouillées de tout revêtement textuel, et pouvant être appréhendées indépendamment du processus de leur production, sous forme d’énoncés autonomes, comme des phrases qui ne prendraient pas d’emblée place dans des textes, à l’intérieur desquels elles revêtent un sens qui, pour une part, déborde les limites objectives de leur énoncé, et s’offre à être restitué au point de vue, non seulement d’une épistémologie, mais aussi d’une poétique.The paper presents Fernand Hallyn’s Les Structures rhétoriques de la science de Kepler à Maxwell (Seuil, 2004, as an exploration of the theoretical imagination’s forms spreading between literary and scientific practices. This approach refuses any relativism about truth for science is not considered as a particular way to fictionalize reality. Fernand Hallyn throws so new light not on the achieved science, but on the science process, as modeled by rhetoric and poetic. Such analysis leads to abandon the idea that scientific knowledge gives nude, untextual truths, independent of their production process, like self

  14. La obra poética de Blas de Otero

    Directory of Open Access Journals (Sweden)

    Fernando Carratalá

    2006-12-01

    Full Text Available El escritor vasco Blas de Otero (Bilbao, 15-3-1916; Majadahonda –Madrid–, 29-6- 1979 es, en opinión de amplios sectores de la crítica, uno de los poetas líricos más relevantes en el panorama de la poesía contemporánea española. Fue Premio Boscán de Poesía 1950 (Redoble de conciencia y Premio de la Crítica 1959 y Premio Fastenrath 1961 (An- cia. Otero se mantuvo al margen de grupos literarios siguiendo un camino muy personal, aunque en él aparecen las tendencias en las que crecen y maduran los nuevos poetas de la posguerra: poesía de tono religioso; poesía de intención anticlasicista y antiformalista (poesía «desarraigada», en denominación de Dámaso Alonso, en respuesta al neogarcilasismo de José García Nieto y otros poetas de la llamada «Juventud Creadora» –años 1939–1944 aproximadamente–, e iniciada en 1944 con dos grandes libros: Sombra del paraíso, de Vicente Aleixandre, e Hijos de la ira, de Dámaso Alonso, libros que traen una poesía más humana y auténtica; y la que se ha llamado poesía «social». Blas de Otero que- da inmerso en estas tres tendencias, pero sin dependencia, sin ser en ninguna de ellas un mero seguidor de una moda poética.

  15. PEMODELAN KONDUKTIVITAS ION DALAM STRUKTUR Li2Sc3(PO43 (Modeling Ionic Conductivity in Li2Sc3(PO43 Structure

    Directory of Open Access Journals (Sweden)

    Akram La Kilo

    2011-11-01

    Full Text Available ABSTRAK Fasa Li2Sc3(PO43 merupakan material konduktor superionik yang dapat diaplikasikan sebagai baterai yang dapat diisi ulang (rechargeable. Ion Li+ dalam struktur Li2Sc3(PO4 dapat mengalami migrasi dari posisi terisi ke posisi kosong. Penelitian ini telah memodelkan migrasi ion Li+ dalam struktur Li2Sc3(PO4 dengan menggunakan metode bond valence sum (BVS. Metode ini dapat memprediksi bilangan oksidasi suatu atom berdasarkan jarak dengan atom-atom tetangga. Source code berbasis BVS yang digunakan adalah JUMPITER yang mensimulasi efek gaya listrik eksternal yang bertindak pada ion litium sehingga nilai BVS litium dapat dipetakan terhadap jarak. Hasil simulasi menunjukkan bahwa konduksi ion Li+ dapat terjadi pada arah [010], [101], dan [120]. Namun, lintasan konduksi ion Li+ lebih mudah terjadi pada arah [120] atau bidang ab dengan nilai maksimum BVS adalah 0,982. ABSTRACT g-phase of Li2Sc3(PO43 is a lithium super ionic conductor which can be applied as a rechargeable lithium battery. Lithium ions of g-Li2Sc3(PO43 can migrate from occupied site to vacant site. In this research, simulation of Li+ ions migration in the structure of g-Li2Sc3(PO43 carried out using bond valence sum (BVS to predict the oxidation state of Li+ion based on the distance of the ion to neighboring atoms. BVS-based code used JUMPITER to simulate the effect of external electrical force acting on the lithium ions to produce the lithium BVS value which can be mapped to the distance. The simulation results shows that Li+ ion conduction can be occurred on [010], [101], and [120] directions. However, the Li ion conduction pathway occur more easily in the direction of [120] or ab plane with the BVS maximum value is 0.982.

  16. Conductivity of Composite Material Based on System NdPO4·nH2OCsH2PO4

    DEFF Research Database (Denmark)

    Anfimova, Tatiana; Bjerrum, Niels J.; Li, Qingfeng

    2013-01-01

    The goal of the present study was to obtain a comprehensive knowledge about synthesis conditions, structure, thermal behavior and conductivity properties of neodymiumorthophosphates in order to analyze of use this material in intermediate temperature fuel cells due to their thermal and chemical...... stability properties.The impedance spectroscopy technique (IS) was used to measure the conductivity. The conductivity of composites observed to be lower than conductivity of pure CsH2PO4 but had improved sufficiently conductivity of pure NdPO4·nH2O...

  17. Vanishing of T sub c and appearance of quantum paraelectricity in KD sub 2 PO sub 4 and KH sub 2 PO sub 4 under high pressure

    CERN Document Server

    Endo, S; Tokunaga, M

    2002-01-01

    The temperature dependences of the dielectric constants of the hydrogen-bond ferroelectrics KH sub 2 PO sub 4 (KDP) and KD sub 2 PO sub 4 (DKDP) were measured under high hydrostatic pressure. Their ferroelectric transition temperatures T sub c monotonically decreased with increasing pressure and the ferroelectric state vanished at p sub c : 1.7 GPa for KDP and 6.1 GPa for DKDP. On the other hand, the Curie constant remained finite at p sub c , which indicates that the ferroelectric phase transition at high pressure is of displacive type. At pressures around p sub c , quantum paraelectricity was observed in KDP and DKDP.

  18. Por uma geografia poética: paisagem e escrita em Ruy Duarte

    Directory of Open Access Journals (Sweden)

    Márcia dos Santos do Nascimento

    2010-12-01

    Full Text Available Entre margens e paisagens, surpreendemos nas paisagens literárias de Angola, o percurso poético de Ruy Duarte de Carvalho, um escritor que transita entre a prosa e a poesia, a escrita e a oralidade, a literatura e a etnografia. Assim, o presente trabalho pretende uma leitura acerca desses registros, partindo dos conceitos de autoetnografia e autoficção, com vistas a mapear uma geografia poética em diferença das savanas angolanas.Palavras-chaves: Geografia poética; Autoetnografia e autoficção; Ruy Duarte de Carvalho; Geografias literárias africanas; Poética

  19. Ekspert po SMI : Nuzhno tshotko ukazõvat na zakaznoi material / Ksenia Repson

    Index Scriptorium Estoniae

    Repson, Ksenia

    2007-01-01

    Telekanalis Pervõi Baltiiskii Kanal näidatud film Keskerakonna esimehest Edgar Savisaarest " Po prozvishtshu Nossorog" oli tehtud Keskerakonna tellimusel. Meediaeksperdi Tarmu Tammerki arvamus reklaamtelesaadete või -filmide nõuete kohta

  20. Magnetic structures, phase diagram and spin waves of magneto-electric LiNiPO4

    DEFF Research Database (Denmark)

    Jensen, Thomas Bagger Stibius

    2007-01-01

    LiNiPO4 is a magneto-electric material, having co-existing antiferromagnetic and ferroelectric phases when suitable magnetic fields are applied at low temperatures. Such systems have received growing interest in recent years, but the nature of the magneticelectric couplings is yet to be fully...... understand. Hopefully, studying LiNiPO4 will shed further light on the subject, especially since the crystal structure of LiNiPO4 is rather simple compared to most relevant multiferroic materials. Although the study of the magnetic-electric couplings is of main interest to the many scientists guiding me...... through the last three years, it is not the primary subject of this thesis. The objective of the phD project has been to provide groundwork that may be beneficiary to future studies of LiNiPO4. More specifically, we have mapped out the magnetic HT phase diagram with magnetic fields below 14.7 T applied...

  1. La description de la nature dans la poésie andalouse

    Directory of Open Access Journals (Sweden)

    Dr Karima El Jai

    2016-09-01

    Full Text Available La description de la nature occupe une très grande place dans la poésie arabe. A l’époque préislamique les poètes décrivent le désert puis les alentours. Les éléments naturels qui dominent dans leur poésie sont inspiré du milieu bédouin de l’Arabie. Ils décrivent la nature telle qu’ils la voient ou telle qu’ils la ressentent. La demeure et la famille, les collines, le désert, le cheval, le chameau, la gazelle, les palmiers, les oasis : tous ces éléments sont souvent traités dans leurs poèmes.

  2. Peroxidase-Like Catalytic Activity of Ag3PO4 Nanocrystals Prepared by a Colloidal Route

    Science.gov (United States)

    Liu, Yuanjun; Zhu, Guoxing; Yang, Jing; Yuan, Aihua; Shen, Xiaoping

    2014-01-01

    Nearly monodispersed Ag3PO4 nanocrystals with size of 10 nm were prepared through a colloidal chemical route. It was proven that the synthesized Ag3PO4 nanoparticles have intrinsic peroxidase-like catalytic activity. They can quickly catalyze oxidation of the peroxidase substrate 3, 3, 5, 5-tetramethylbenzidine (TMB) in the presence of H2O2, producing a blue color. The catalysis reaction follows Michaelis-Menten kinetics. The calculated kinetic parameters indicate a high catalytic activity and the strong affinity of Ag3PO4 nanocrystals to the substrate (TMB). These results suggest the potential applications of Ag3PO4 nanocrystals in fields such as biotechnology, environmental chemistry, and medicine. PMID:25271632

  3. Synthesis, crystal structure and optical properties of Li 2Cu 5(PO 4) 4

    Science.gov (United States)

    Cui, Liang; Pan, Shilie; Han, Jian; Dong, Xiaoyu; Zhou, Zhongxiang

    2011-06-01

    The single crystals of Li 2Cu 5(PO 4) 4 have been grown in the Li 2CO 3-H 3BO 3 borate fluxes. Li 2Cu 5(PO 4) 4 crystallizes in the centrosymmetric triclinic space group P-1 with a = 6.03580(10) Å, b = 9.2211(2) Å, c = 11.4138(2) Å, α = 75.5750(10)°, β = 80.2540(10)°, γ= 74.1590(10)°, Z = 2. The three-dimensional framework is built up of LiO 5, CuO 4, Cu/LiO 5 polyhedra and isolated PO 4 tetrahedra. The IR spectrum and UV-Vis-NIR diffuse reflectance spectrum of Li 2Cu 5(PO 4) 4 have been studied.

  4. Carbon coatings with olive oil, soybean oil and butter on nano-LiFePO 4

    Science.gov (United States)

    Kim, Ketack; Jeong, Ji Hwa; Kim, Ick-Jun; Kim, Hyun-Soo

    Kitchen oils (olive, soybean and butter) are selected for carbon coatings on LiFePO 4. The surface properties of LiFePO 4 are unknown or vary depending on synthetic methods. The multi-functional groups of fatty acids in the oils can orient properly to cope with the variable surface properties of LiFePO 4, which can lead to dense carbon coatings. The low price and low toxicity of kitchen oils are other advantages of the coating process. LiFePO 4 (D 50 = 121 nm)combined with the carbon coating enhances the rate capability. Capacities at the 2 C rate reach 150 mAh g -1 or higher. The charge retention values of 2.0 C/0.2 C are between 94.4 and 98.9%.

  5. Molecular cloning, structure and expressional profiles of two novel single-exon genes (PoCCR6A and PoCCR6B) in the Japanese flounder (Paralichthys olivaceus).

    Science.gov (United States)

    Wang, Lei; Zhang, Yong-zhen; Xu, Wen-teng; Jia, Xiao-dong; Chen, Song-lin

    2016-05-01

    CCR6 is an important binding receptor of CCL20 and beta-defensins, and has multiple functions in the innate and acquired immune responses. In this study, we cloned the PoCCR6A and PoCCR6B genes of the Japanese flounder and studied the gene structure and expression patterns of these two genes in bacterial infection. The full-length PoCCR6A cDNA is 1415 bp and the open reading frame (ORF) is 1113 bp, encoding a 370-amino-acid peptide. The full-length PoCCR6B cDNA is 2193 bp and the ORF is 1029 bp, encoding a 363-amino-acid peptide. The structures of PoCCR6A and PoCCR6B indicate that they are single-exon genes. The predicted proteins encoded by PoCCR6A and PoCCR6B have the typical G-protein-coupled receptor (GPCR) family signature of seven transmembrane domains and several conserved structural features. A tissue distribution analysis showed that PoCCR6A is predominately expressed in the intestine, gill, and blood, and PoCCR6B in the gill, spleen, and liver. The expression patterns of the two chemokine receptors were analyzed during bacterial infection. In spleen and kidney, the expression of PoCCR6A was significantly upregulated at 24 h after infection, whereas the expression of PoCCR6B was steady at these time points. While in intestine, both of them were upregulated at 6 h-12 h after infection, and in gill the expression levels of them were upregulated at 24 h. The patterns of expression suggested that PoCCR6A and PoCCR6B play an important role in the immune response of the Japanese flounder, especially in the mucosal tissues. Copyright © 2016 Elsevier Ltd. All rights reserved.

  6. Improvement of electrochemical activity of LiMnPO4-based cathode by surface iron enrichment

    Science.gov (United States)

    Xu, Xiaoyue; Wang, Tao; Bi, Yujing; Liu, Meng; Yang, Wenchao; Peng, Zhe; Wang, Deyu

    2017-02-01

    LiMnPO4 has attracted massive interests due to its appropriate redox potential and the success of its iron comparative in the lithium ion batteries. The bulk substitution has been widely used to address the poor electrochemical activity of LiMnPO4, which is much lower than that of LiFePO4. In this work, we compare the performance of the core-shell structure and the homogeneous substitution with the same Mn/Fe molar ratio of LiMn0.8Fe0.2PO4. The core-shell phosphate material after carbon coating is composed of a core part of quasi-single LiMnPO4 phase, and a 3-4 nm shell layer of quasi-single LiFePO4-phase, separated by the phase boundary with 1-2 nm thickness. It is interesting to reveal that the core-shell samples exhibit capacities of 156.4, 144.5, 128.2 mAh g-1 under 0.1C, 1C and 5C respectively, which are 5-10% higher than that of the homogenous substituted LiMn0.8Fe0.2PO4 at the corresponding rates, while both of these samples present excellent cyclic stability, still retaining ∼95% of the initial capacities after 1000 cycles under 1C discharging rate. Our results demonstrate that the main reason for LiMnPO4's poor electrochemical activity should be emphasized on the surface polarization, whereas the tardiness on bulk transportation is not as serious as it was presumed.

  7. Biocarbon-coated LiFePO4 nucleus nanoparticles enhancing electrochemical performances

    DEFF Research Database (Denmark)

    Zhang, X.G.; Zhang, X.D.; He, W.

    2012-01-01

    We report a green biomimetic method to synthesize biocarbon-coated LiFePO4 nucleus nanoparticles using yeast cells as both a structural template and a biocarbon source for high-power lithium-ion batteries.......We report a green biomimetic method to synthesize biocarbon-coated LiFePO4 nucleus nanoparticles using yeast cells as both a structural template and a biocarbon source for high-power lithium-ion batteries....

  8. Environmentally benign novel green pigments: Pr1–xCaxPO4 (x= 0 ...

    Indian Academy of Sciences (India)

    Rare earth based materials have recently attracted considerable attention as potential eco-friendly colourants for low temperature as well as high temperature applications. In the present study, we have synthesized a series of Ca-doped PrPO4 compounds with the general formula, Pr1–CaPO4 ( = 0–0.4 in steps of 0.1) ...

  9. Modeling Li-ion conductivity in LiLa(PO{sub 3}){sub 4} powder

    Energy Technology Data Exchange (ETDEWEB)

    Mounir, Ferhi, E-mail: ferhi.mounir@gmail.com [Laboratoire de Physicochimie des Materiaux Mineraux et leurs Applications, Centre National des Recherches en Sciences des Materiaux, BP No. 73, 8027 Soliman (Tunisia); Karima, Horchani-Naifer [Laboratoire de Physicochimie des Materiaux Mineraux et leurs Applications, Centre National des Recherches en Sciences des Materiaux, BP No. 73, 8027 Soliman (Tunisia); Khaled, Ben Saad [Laboratoire de Photovoltaieque, Centre des Recherches et des Technologies de l' Energie, Technopole Borj Cedria, BP No. 95, 2050 Hammam Lif (Tunisia); Mokhtar, Ferid [Laboratoire de Physicochimie des Materiaux Mineraux et leurs Applications, Centre National des Recherches en Sciences des Materiaux, BP No. 73, 8027 Soliman (Tunisia)

    2012-07-01

    Polycrystalline powder and single-crystal of LiLa(PO{sub 3}){sub 4} are synthesized by solid state reaction and flux technique, respectively. A morphological description of the obtained product was made based on scanning electron microscopy micrographs. The obtained powder was characterized by X-ray powder diffraction, FTIR and Raman spectroscopies. Ionic conductivity of the LiLa(PO{sub 3}){sub 4} powder was measured and evaluated over a temperature range from 553 to 913 K. Single crystals of LiLa(PO{sub 3}){sub 4} are characterized by single-crystal X-ray diffraction. The LiLa(PO{sub 3}){sub 4} structure was found to be isotypic with LiNd(PO{sub 3}){sub 4}. It crystallizes in the monoclinic system with space group C2/c and cell parameters: a=16.635(6) A, b=7.130(3) A, c=9.913(3) A, {beta}=126.37(4) Degree-Sign , V=946.72(6) A{sup 3} and Z=4. The LiLa(PO{sub 3}){sub 4} structure was described as an alternation between spiraling chains (PO{sub 3}){sub n} and (La{sup 3+}, Li{sup +}) cations along the b direction. The small Li{sup +} ions, coordinated to four oxygen atoms, were located in the large connected cavities created between the LaO{sub 8} polyhedra and the polyphosphate chains. The jumping of Li{sup +} through tunnels of the crystalline network was investigated using complex impedance spectroscopy. The close value of the activation energies calculated through the analysis of conductivity data and loss spectra indicate that the transport in the investigated system is through hopping mechanism. The correlation between ionic conductivity of LiLa(PO{sub 3}){sub 4} and its crystallographic structure was investigated and the most probably transport pathway model was determined.

  10. Sky Fest: A Model of Successful Scientist Participation in E/PO

    Science.gov (United States)

    Dalton, H.; Shipp, S. S.; Shaner, A. J.; LaConte, K.; Shupla, C. B.

    2014-12-01

    Participation in outreach events is an easy way for scientists to get involved with E/PO and reach many people with minimal time commitment. At the Lunar and Planetary Institute (LPI) in Houston, Texas, the E/PO team holds Sky Fest outreach events several times a year. These events each have a science content theme and include several activities for children and their parents, night sky viewing through telescopes, and scientist presentations. LPI scientists have the opportunity to participate in Sky Fest events either by helping lead an activity or by giving the scientist presentation (a short lecture and/or demonstration). Scientists are involved in at least one preparation meeting before the event. This allows them to ask questions, understand what activity they will be leading, and learn the key points that they should be sharing with the public, as well as techniques for effectively teaching members of the public about the event topic. During the event, each activity is run by one E/PO specialist and one scientist, enabling the scientist to learn about effective E/PO practices from the E/PO specialist and the E/PO specialist to get more science information about the event topic. E/PO specialists working together with scientists at stations provides a more complete, richer experience for event participants. Surveys of event participants have shown that interacting one-on-one with scientists is often one of their favorite parts of the events. Interviews with scientists indicated that they enjoyed Sky Fest because there was very little time involved on their parts outside of the actual event; the activities were created and/or chosen by the E/PO professionals, and setup for the events was completed before they arrived. They also enjoyed presenting their topic to people without a background in science, and who would not have otherwise sought out the information that was presented.

  11. Highly efficient photocatalytic degradation of methylene blue by PoPD/TiO2 nanocomposite.

    Directory of Open Access Journals (Sweden)

    Chuanxi Yang

    Full Text Available The poly-o-phenylenediamine (PoPD/TiO2 nanocomposite was successfully synthesized via 'in situ' oxidative polymerization method. The modified photocatalysts were characterized by BET, scanning electron microscopy (SEM, transmission electron microscopy (TEM, X-ray diffraction (XRD, Fourier-transform infrarad spectra (FT-IR, thermogravimrtic analysis (TGA, X-ray photoelectron spectroscopy (XPS, Ultraviolet-visible diffuse reflectance spectrum (UV-Vis DRS and Photocurrent Test. The results showed that the PoPD exists on the surface of TiO2, the presence of PoPD does not impact on the lattice structure and grain size of TiO2, and the presence of PoPD enhances the visible response and photoelectric property. The photocatalytic degradation of methylene blue (MB was chosen as a model reaction to evaluate the photocatalytic activities of TiO2 and PoPD/TiO2. The optimal preparation condition was the molar ratio of oPD to TiO2 = 3:1, HCl concentration = 1.2 mol/L, the molar ratio of APS to oPD = 1:1. The apparent first-order rate constant kapp of PoPD/TiO2 nanocomposite was 0.0098 min-1, which is 6 times higher than TiO2 (0.0016 min-1. Meanwhile, the PoPD/TiO2 nanocomposites showed excellent photocatalytic stability, and the photocatalytic stability was depended on the stability of structure. At last, the photocatalytic mechanism of POPD/TiO2 nanocomposites was also proposed based on the synergetic effect between TiO2 and PoPD.

  12. Online Workspace to Connect Scientists with NASA's Science E/PO Efforts and Practitioners

    Science.gov (United States)

    Shipp, Stephanie; Bartolone , Lindsay; Peticolas, Laura; Woroner, Morgan; Dalton, Heather; Schwerin, Theresa; Smith, Denise

    2014-11-01

    There is a growing awareness of the need for a scientifically literate public in light of challenges facing society today, and also a growing concern about the preparedness of our future workforce to meet those challenges. Federal priorities for science, technology, engineering, and math (STEM) education call for improvement of teacher training, increased youth and public engagement, greater involvement of underrepresented populations, and investment in undergraduate and graduate education. How can planetary scientists contribute to these priorities? How can they “make their work and findings comprehensible, appealing, and available to the public” as called for in the Planetary Decadal Survey?NASA’s Science Mission Directorate (SMD) Education and Public Outreach (E/PO) workspace provides the SMD E/PO community of practice - scientists and educators funded to conduct SMD E/PO or those using NASA’s science discoveries in E/PO endeavors - with an online environment in which to communicate, collaborate, and coordinate activities, thus helping to increase effectiveness of E/PO efforts. The workspace offers interested scientists avenues to partner with SMD E/PO practitioners and learn about E/PO projects and impacts, as well as to advertise their own efforts to reach a broader audience. Through the workspace, scientists can become aware of opportunities for involvement and explore resources to improve professional practice, including literature reviews of best practices for program impact, mechanisms for engaging diverse audiences, and large- and small-scale program evaluation. Scientists will find “how to” manuals for getting started and increasing impact with public presentations, classroom visits, and other audiences, as well as primers with activity ideas and resources that can augment E/PO interactions with different audiences. The poster will introduce the workspace to interested scientists and highlight pathways to resources of interest that can help

  13. The impact of perceived and actual PO fit on employees’ work-related attitudes and behaviors

    OpenAIRE

    De Cooman, Rein; De Gieter, Sara; Hofmans, Dorien

    2010-01-01

    The fit between employees and their organization (person-organization fit, i.e., PO fit) tends to have a significant influence on a variety of important work-related attitudes and behaviors, such as job satisfaction, organizational commitment, turnover intention, and performance (Kristof-Brown, Zimmerman, & Johnson, 2005; Verquer, Beehr, & Wagner, 2003). Yet, previous studies provided mixed results regarding the consequences of PO fit. This is probably due to differences in the operationaliza...

  14. Removal of 210Po from aqueous media and its thermodynamics and kinetics.

    Science.gov (United States)

    Erenturk, S Akyil; Kaygun, A Kilincarslan

    2017-08-01

    In this study, the composite adsorbent as granule was prepared by mixing of polyacrylonitrile (PAN) and a natural zeolite (clinoptilolite) in specific conditions. The prepared composite adsorbent was used for investigating the adsorption behaviour of 210Po. Adsorption of 210Po was studied in a column system. The effective parameters such as initial activity concentration of 210Po, pH of the aqueous solution, contact time and temperature of solution for adsorption behaviour of 210Po were studied. Adsorption yield of 210Po on composite adsorbent from aqueous solution in optimum conditions were determined as 75.00 ± 0.15%. The adsorption equilibrium data was examined using various well-known isotherm models such as Freundlich, Langmuir, Dubinin and Radushkevish and Tempkin, and it was observed that the experimental equilibrium data well fitted and found to be in good agreement with the Tempkin model. Adsorption thermodynamics and kinetics of the polonium were studied. It was found that the processes for 210Po were exothermic and spontaneous. The kinetic data conformed better to the pseudo-second order equation. Copyright © 2017 Elsevier Ltd. All rights reserved.

  15. Levels and transfer of {sup 210}Po and {sup 210}Pb in Nordic terrestrial ecosystems

    Energy Technology Data Exchange (ETDEWEB)

    Brown, J.E., E-mail: justin.brown@nrpa.n [Norwegian Radiation Protection Authority, PO Box 55, N-1332, Osteras (Norway); Gjelsvik, R. [Norwegian Radiation Protection Authority, PO Box 55, N-1332, Osteras (Norway); Roos, P. [RISO-DTU P.O. Box 49 DK-4000 Roskilde (Denmark); Kalas, J.A. [Norwegian Institute for Nature Research (NINA), Tungasletta 2, 7485 Trondheim (Norway); Outola, I. [STUK, Laippatie 4/P.O. BOX 14, 00881 Helsinki (Finland); Holm, E. [Norwegian Radiation Protection Authority, PO Box 55, N-1332, Osteras (Norway)

    2011-05-15

    Recent developments regarding environmental impact assessment methodologies for radioactivity have precipitated the need for information on levels of naturally occurring radionuclides within and transfer to wild flora and fauna. The objectives of this study were therefore to determine activity concentrations of the main dose forming radionuclides {sup 210}Po and {sup 210}Pb in biota from terrestrial ecosystems thus providing insight into the behaviour of these radioisotopes. Samples of soil, plants and animals were collected at Dovrefjell, Central Norway and Olkiluoto, Finland. Soil profiles from Dovrefjell exhibited an approximately exponential fall in {sup 210}Pb activity concentrations from elevated levels in humus/surface soils to 'supported' levels at depth. Activity concentrations of {sup 210}Po in fauna (invertebrates, mammals, birds) ranged between 2 and 123 Bq kg{sup -1} d.w. and in plants and lichens between 20 and 138 Bq kg{sup -1} d.w. The results showed that soil humus is an important reservoir for {sup 210}Po and {sup 210}Pb and that fauna in close contact with this media may also exhibit elevated levels of {sup 210}Po. Concentration ratios appear to have limited applicability with regards to prediction of activity concentrations of {sup 210}Po in invertebrates and vertebrates. Biokinetic models may provide a tool to explore in a more mechanistic way the behaviour of {sup 210}Po in this system.

  16. Inhalation of {sup 210}Po and {sup 210}Pb from cigarette smoking in Poland

    Energy Technology Data Exchange (ETDEWEB)

    Skwarzec, B. E-mail: bosk@chemik.chem.univ.gda.pl; Ulatowski, J.; Struminska, D.I.; Borylo, A

    2001-07-01

    The carcinogenic effect of {sup 210}Po and {sup 210}Pb with respect to lung cancer is an important problem in many countries with very high cigarette consumption. Poland has one of the highest consumptions of cigarettes in the world. The results of {sup 210}Po determination on the 14 most frequently smoked brands of cigarettes which constitute over 70% of the total cigarette consumption in Poland are presented and discussed. Moreover, the polonium content in cigarette smoke was estimated on the basis of its activity in fresh tobaccos, ash, fresh filters and post-smoking filters. The annual effective doses were calculated on the basis of {sup 210}Po and {sup 210}Pb inhalation with the cigarette smoke. The results of this work indicate that Polish smokers who smoke one pack (20 cigarettes) per day inhale from 20 to 215 mBq of {sup 210}Po and {sup 210}Pb each. The mean values of the annual effective dose for smokers were estimated to be 35 and 70 {mu}Sv from {sup 210}Po and {sup 210}Pb, respectively. For persons who smoke two packs of cigarettes with higher radionuclide concentrations, the effective dose is much higher (471 {mu}Sv yr{sup -1}) in comparison with the intake in diet. Therefore, cigarettes and the absorption through the respiratory system are the main sources and the principal pathway of {sup 210}Po and {sup 210}Pb intake of smokers in Poland.

  17. Variation of {sup 210}Po daily urinary excretion for male subjects at environmental level

    Energy Technology Data Exchange (ETDEWEB)

    Hoelgye, Z.; Hyza, M.; Mihalik, J.; Rulik, P.; Skrkal, J. [National Radiation Protection Institute, Prague (Czech Republic)

    2015-05-15

    {sup 210}Po was determined in 24-h urine of seven healthy males from Prague, Czech Republic, for ten consecutive days. The results show that for each volunteer, the urinary excretion of {sup 210}Po changed only little from day to day in the studied time period. For two volunteers, the difference in the daily excreted {sup 210}Po activity for two consecutive days was not significant, given the 95 % confidence interval (two sigma) of the activity measurements. The same is valid for the excretion data of the other volunteers, except for some days where the differences were slightly higher. The range of daily urinary excretion of {sup 210}Po of each volunteer in the studied time period was quite narrow. Among the volunteers, the maximum daily urinary excretion value of {sup 210}Po was at most about a factor of 2.5 higher than the lowest excretion value. An attempt to explain the observed small inter-individual variability of {sup 210}Po excretion in daily urine is made. (orig.)

  18. Saproxylic beetles of the Po plain woodlands, Italy

    Science.gov (United States)

    Bogliani, Giuseppe

    2014-01-01

    Abstract Forest ecosystems play an important role for the conservation of biodiversity, and for the protection of ecological processes. The Po plain woodlands which once covered the whole Plain, today are reduced in isolated highly threatened remnants by modern intensive agriculture. These close to natural floodplain forests are one of the most scarce and endangered ecosystems in Europe. Saproxylic species represent a major part of biodiversity of woodlands. The saproxylic insects are considered one of the most reliable bio-indicators of high-quality mature woodlands and have a very important role in regard to the protection and monitoring of forest biodiversity due to their highly specific living environments. As a result of the dramatic reduction of mature forests and the decreased availability of deadwood most of the saproxylic communities are greatly diminishing. The study was conducted in the Ticino Valley Regional Park and the aim is to contribute to the expansion of knowledge on the saproxylic beetles of Lombardy. We investigated 6 sampling sites belonging to alluvial and riparian mixed forests. For each forest we selected 12 trees. For beetles’ collection we used two different traps: Eclector Traps and Trunk Window Traps (total of 72 traps and 864 samples collected). We determined 4.387 beetles from 87 saproxylic species belonging to 21 families. Of these species 51 were not included in the previous checklist of the Park. By comparing the two different techniques used for catching saproxylic beetles, we found a significantly high difference in species richness between Window Traps (WT) and Eclector Traps (ET) with a higher number of species captured in the Window Traps. However, the combined use of two different types of traps significantly expanded the spectrum of insects captured Among the species reported as Least Concern in the IUCN Red List, we found interesting species such as the Elateridae Calambus bipustulats, the Eucnemidae Melasis buprestoides

  19. Silica-modified luminescent LaPO4:Eu@LaPO4@SiO2core/shell nanorods: Synthesis, structural and luminescent properties.

    Science.gov (United States)

    Ansari, Anees A

    2018-02-01

    Monoclinic-type tetragonal LaPO 4 :Eu (core) and LaPO 4 :Eu@LaPO 4 (core/shell) nanorods (NRs) were successfully prepared using a urea-based co-precipitation process under ambient conditions. An amorphous silica layer was coated around the luminescent core/shell NRs via the sol-gel process to improve their solubility and colloidal stability in aqueous and non-aqueous media. The prepared nano-products were systematically characterized by X-ray diffraction pattern, transmission electron microscopy, energy dispersive X-ray analysis, and FTIR, UV/Vis, and photoluminescence spectroscopy to examine their phase purity, crystal phase, surface chemistry, solubility and luminescence characteristics. The length and diameter of the nano-products were in the range 80-120 nm and 10-15 nm, respectively. High solubility of the silica-modified core/shell/Si NRs was found for the aqueous medium. The luminescent core NRs exhibited characteristic excitation and emission transitions in the visible region that were greatly affected by surface growth of insulating LaPO 4 and silica layers due to the multiphonon relaxation rate. Our luminescence spectral results clearly show a distinct difference in intensities for core, core/shell, and core/shell/Si NRs. Highly luminescent NRs with good solubility could be useful candidates for a variety of photonic-based biomedical applications. Copyright © 2017 John Wiley & Sons, Ltd.

  20. Determination of {sup 210}Pb and {sup 210}Po in cigarette tobacco; Determinacao de {sup 210}Pb e {sup 210}Po em tabaco de cigarros nacionais

    Energy Technology Data Exchange (ETDEWEB)

    Peres, Ana Claudia

    1999-07-01

    Cigarette smoking is one of the important pathways that could contribute to enhance the radiation dose to man, due to the relatively large concentrations of {sup 210}Pb and {sup 210}Po found in tobacco leaves. In this work, concentrations of these two radionuclides were determined in eight of the most commercialized cigarette brands produced in Brazil. The samples analyzed were bought randomly in the market. The {sup 210}Pb was determined by counting the beta activity of the {sup 210}Bi in a gas flow proportional detector, after radiochemical separation and precipitation of the PbCr0{sub 4}. The {sup 210}Po was determined by alpha spectrometry, using a surface barrier detector, after radiochemical separation and spontaneous deposition of Po in copper disk. The results showed concentrations ranging from 11,9 to 30,2 mBq per gram of dry tobacco for {sup 210}Pb and from 10,9 to 27,4 mBq per gram of dry tobacco for {sup 210}Po. (author)

  1. Synthesis of LiTiPO 5 and LiTiAsO 5 with the α-Fe 2PO 5 Structure

    Science.gov (United States)

    Robertson, A.; Fletcher, J. G.; Skakle, J. M. S.; West, A. R.

    1994-03-01

    The new phases LiTiPO 5 and LiTiAsO 5 have been synthesized by solid state reaction. They are essentially isostructural with α-Fe 2PO 5, as confirmed by X-ray Rietveld refinement. The structures are built of chains of edge-sharing LiO 6 octahedra cross-linked by chains of alternate corner-sharing PO 4 tetrahedra and TiO 6 octahedra (each of which shares common faces with two LiO 6 octahedra). Unit cell dimensions: LiTiPO 5, a = 7.4000(5) Å, b = 6.3752(3) Å, c = 7.2347(4) Å; LiTiAsO 5, a = 7.5257(5) Å, b = 6.5786(4) Å, c = 7.4524(5) Å. Space group: Pnma. The phases melt incongruently at ˜1080°C and exhibit very low electrical conductivities, (5-10) × 10 -6 S cm -1 at 400°C with activation energy ˜1 eV. Subsolidus phase diagrams for the systems Li 2O-TiO 2-P 2O 5/As 2O 5 are presented.

  2. Syntheses, crystal structures, NMR spectroscopy, and vibrational spectroscopy of Sr(PO{sub 3}F).H{sub 2}O and Sr(PO{sub 3}F)

    Energy Technology Data Exchange (ETDEWEB)

    Jantz, Stephan G.; Hoeppe, Henning A. [Lehrstuhl fuer Festkoerperchemie, Institut fuer Physik, Universitaet Augsburg (Germany); Wuellen, Leo van; Fischer, Andreas [Lehrstuhl fuer Chemische Physik und Materialwissenschaften, Institut fuer Physik, Universitaet Augsburg (Germany); Libowitzky, Eugen [Institute for Mineralogy and Crystallography, Faculty of Geosciences, Geography and Astronomy, University of Vienna (Austria); Baran, Enrique J. [Centro de Quimica Inorganica (CEQUINOR/CONICET, UNLP), Facultad de Ciencias Exactas, Universidad Nacional de La Plata (Argentina); Weil, Matthias [Institute for Chemical Technologies and Analytics, Division Structural Chemistry, Vienna University of Technology (Austria)

    2016-03-15

    Single crystals of Sr(PO{sub 3}F).H{sub 2}O {P2_1/c, Z = 4, a = 7.4844(2) Aa, b = 7.0793(2) Aa, c = 8.4265(2) Aa, β = 108.696(1) , V = 422.91(2) Aa"3, 2391 F_o"2, 70 parameters, R_1[F"2 > 2σ(F"2)] = 0.036; wR_2(F"2 all) = 0.049, S = 1.054} were grown from an aqueous solution by a metathesis reaction. The structure comprises [SrO{sub 8}] polyhedra and PO{sub 3}F tetrahedra that form a layered arrangement parallel to (100). The topotactic dehydration of this phase proceeds between 80 and 140 C to afford Sr(PO{sub 3}F). The monazite-type crystal structure of Sr(PO{sub 3}F) was elucidated from the X-ray powder data by simulated annealing [P2{sub 1}/c, Z = 4, a = 6.71689(9) Aa, b = 7.11774(11) Aa, c = 8.66997(13) Aa, β = 128.0063(7) , V = 326.605(8) Aa{sup 3}, R{sub p} = 0.010, R{sub wp} = 0.015, R{sub F} = 0.030]. During dehydration, the structure of Sr(PO{sub 3}F) .H{sub 2}O collapses along [100] from a layered arrangement into a framework structure, accompanied by a change of the coordination number of the Sr{sup 2+} ions from eight to nine. The magic-angle spinning (MAS) NMR and vibrational spectroscopy data of both phases are discussed. (Copyright copyright 2016 WILEY-VCH Verlag GmbH and Co. KGaA, Weinheim)

  3. Rapid determination of 210Po in water samples

    Energy Technology Data Exchange (ETDEWEB)

    Maxwell, Sherrod L.; Culligan, Brian K.; Hutchison, Jay B.; Utsey, Robin C.; McAlister, Daniel R.

    2013-08-02

    A new rapid method for the determination of 210Po in water samples has been developed at the Savannah River National Laboratory (SRNL) that can be used for emergency response or routine water analyses. If a radiological dispersive device (RDD) event or a radiological attack associated with drinking water supplies occurs, there will be an urgent need for rapid analyses of water samples, including drinking water, ground water and other water effluents. Current analytical methods for the assay of 210Po in water samples have typically involved spontaneous auto-deposition of 210Po onto silver or other metal disks followed by counting by alpha spectrometry. The auto-deposition times range from 90 minutes to 24 hours or more, at times with yields that may be less than desirable. If sample interferences are present, decreased yields and degraded alpha spectrums can occur due to unpredictable thickening in the deposited layer. Separation methods have focused on the use of Sr Resin, often in combination with 210Pb analysis. A new rapid method for 210Po in water samples has been developed at the Savannah River National Laboratory (SRNL) that utilizes a rapid calcium phosphate co-precipitation method, separation using DGA Resin (N,N,N,N-tetraoctyldiglycolamide extractant-coated resin, Eichrom Technologies or Triskem-International), followed by rapid microprecipitation of 210Po using bismuth phosphate for counting by alpha spectrometry. This new method can be performed quickly with excellent removal of interferences, high chemical yields and very good alpha peak resolution, eliminating any potential problems with the alpha source preparation for emergency or routine samples. A rapid sequential separation method to separate 210Po and actinide isotopes was also developed. This new approach, rapid separation with DGA Resin plus microprecipitation for alpha source preparation, is a significant advance in

  4. Structure determination and optical properties of CsSm(PO{sub 3}){sub 4}

    Energy Technology Data Exchange (ETDEWEB)

    Ben Hassen, N.; Ferhi, M., E-mail: ferhi.mounir@gmail.com; Horchani-Naifer, K.; Férid, M.

    2015-03-15

    Graphical abstract: Projection of the CsSm(PO{sub 3}){sub 4} structure viewing along the a axis. - Highlights: • Single crystal of a new polyphosphate CsSm(PO{sub 3}){sub 4} has been synthesized. • The obtained compound has been characterized by several techniques. • The crystal structure of CsSm(PO{sub 3}){sub 4} has been resolved. • Spectroscopic properties of Sm{sup 3+} in CsSm(PO{sub 3}){sub 4} have been performed. - Abstract: A new alkali metal-rare earth polyphosphate CsSm(PO{sub 3}){sub 4} has been synthesized by flux method. The obtained compound has been characterized by means of single crystal X-ray diffraction, Fourier transform infrared (FTIR) and Raman scattering spectroscopies. It crystallizes in the monoclinic space group P2{sub 1}/n with the following unit-cell parameters: a = 10.382(2), b = 8.978(6), c = 11.205(4) Å, β = 106.398(3)° and Z = 4. The structure of CsSm(PO{sub 3}){sub 4} is an infinite three-dimensional framework made up of double spiral (PO{sub 3}){sub n} chains linked with neighboring SmO{sub 8} and CsO{sub 11} polyhedra. Spectroscopic properties of Sm{sup 3+} in this new compound including excitation, emission, and kinetic measurement have been performed. The emission spectrum shows four transitions characteristics of Sm{sup 3+} in the orange–red region by excitation wavelength at 400 nm. The decay time curve of {sup 4}G{sub 5/2} → {sup 6}H{sub 7/2} transition has been also registered and fitted to a single exponential function.

  5. Influence of submarine groundwater discharge on (210)Po and (210)Pb bioaccumulation in fish tissues.

    Science.gov (United States)

    Garcia-Orellana, J; López-Castillo, E; Casacuberta, N; Rodellas, V; Masqué, P; Carmona-Catot, G; Vilarrasa, M; García-Berthou, E

    2016-05-01

    This study presents the results of the accumulation of (210)Po and (210)Pb in fish tissues and organs in a brackish-water marshland that is characterized by high concentrations of (222)Rn and (226)Ra supplied by submarine groundwater discharge (SGD). Tissues and organs from Cyprinus carpio, Chelon labrosus and Carassius auratus in the wetland were significantly enriched by both (210)Pb and (210)Po (up to 55 and 66 times, respectively) compared to blanks. The major input route of (210)Pb and (210)Po into the fish body seems to be through ingestion, due to the high levels of (210)Pb and (210)Po found in the gut content as well as in organs involved in digestion and metabolism (i.e. gut, kidney and hepatopancreas). Results showed that (210)Po was more accumulated in all fish tissues and organs except for the spine, which showed a higher affinity for (210)Pb, due to its capacity to replace Ca from apatite in bones. Over all the variables analyzed, fish tissues/organs and, secondarily, fish species were the most important factors explaining the concentration of radionuclides, whereas fish length and the sampling location played a minor role. The relationship of the two radionuclides varied markedly among tissues and their concentration levels were only correlated in gills, gut and, marginally, in spines. In general, the highest values of (210)Pb and (210)Po concentrations in tissues were found on C. labrosus tissues rather C. auratus and C. carpio. This study demonstrates that inputs of natural radionuclides supplied by SGD to coastal semi-enclosed areas (such as marshlands, lagoons or ponds) may significantly increase the contents of (210)Pb and (210)Po in fish tissues/organs. Thus, this study represents one of the first evidences of direct ecological effects derived from SGD. Copyright © 2016 Elsevier Ltd. All rights reserved.

  6. 210Po in the marine environment with emphasis on its behaviour within the biosphere.

    Science.gov (United States)

    Fowler, Scott W

    2011-05-01

    The distribution and behaviour of the natural-series alpha-emitter polonium-210 in the marine environment has been under study for many years primarily due to its enhanced bioaccumulation, its strong affinity for binding with certain internal tissues, and its importance as a contributor to the natural radiation dose received by marine biota as well as humans consuming seafoods. Results from studies spanning nearly 5 decades show that (210)Po concentrations in organisms vary widely among the different phylogenic groups as well as between the different tissues of a given species. Such variation results in (210)Po concentration factors ranging from approximately 10(3) to over 10(6) depending upon the organism or tissue considered. (210)Po/(210)Pb ratios in marine species are generally greater than unity and tend to increase up the food chain indicating that (210)Po is preferentially taken up by organisms compared to its progenitor (210)Pb. The effective transfer of (210)Po up the food chain is primarily due to the high degree of assimilation of the radionuclide from ingested food and its subsequent strong retention in the organisms. In some cases this mechanism may lead to an apparent biomagnification of (210)Po at the higher trophic level. Various pelagic species release (210)Po and (210)Pb packaged in organic biodetrital particles that sink and remove these radionuclides from the upper water column, a biogeochemical process which, coupled with scavenging rates of this radionuclide pair, is being examined as a possible proxy for estimating downward organic carbon fluxes in the sea. Data related to preferential bioaccumulation in various organisms, their tissues, resultant radiation doses to these species, and the processes by which (210)Po is transferred and recycled through the food web are discussed. In addition, the main gaps in our present knowledge and proposed areas for future studies on the biogeochemical behaviour of (210)Po and its use as a tracer of

  7. Synchrotron powder study of Na3V(PO33N

    Directory of Open Access Journals (Sweden)

    Minwoong Kim

    2013-06-01

    Full Text Available Polycrystalline trisodium vanadium(III nitridotriphosphate, Na3V(PO33N, was prepared by thermal nitridation of a mixture of NaPO3 and V2O5. The title compound is isotypic with Na3Al(PO33N. In the crystal, the P-atom and the three O-atom sites are on general positions, whereas the Na-, V- and N-atom sites are located on threefold rotation axes. The P atom is coordinated by three O atoms and one N atom in form of a slightly distorted tetrahedron. Three PO3N tetrahedra build up a nitridotriphosphate group, (PO33N, by sharing a common N atom. The V atom is coordinated by six O atoms in form of a slightly distorted octahedron. The Na+ ions occupy three crystallographically distinct sites. One Na+ ion is situated in an irregular polyhedral coordination environment composed of six O atoms and one N atom, while the other two Na+ cations are surrounded by six and nine O atoms, respectively.

  8. A review and outlook for the removal of radon-generated Po-210 surface contamination

    Science.gov (United States)

    Guiseppe, V. E.; Christofferson, C. D.; Hair, K. R.; Adams, F. M.

    2018-01-01

    The next generation low-background detectors operating deep underground aim for unprecedented low levels of radioactive backgrounds. The deposition and presence of radon progeny on detector surfaces is an added source of energetic background events. In addition to limiting the detector material's radon exposure in order to reduce potential surface backgrounds, it is just as important to clean surfaces to remove inevitable contamination. Such studies of radon progeny removal have generally found that a form of etching is effective at removing some of the progeny (Bi and Pb), however more aggressive techniques, including electropolishing, have been shown to effectively remove the Po atoms. In the absence of an aggressive etch, a significant fraction of the Po atoms are believed to either remain behind within the surface or redeposit from the etching solution back onto the surface. We explore the chemical nature of the aqueous Po ions and the effect of the oxidation state of Po to maximize the Po ions remaining in the etching solution of contaminated Cu surfaces. We present a review of the previous studies of surface radon progeny removal and our findings on the role of oxidizing agents and a cell potential in the preparation of a clean etching technique.

  9. Advanced carbon materials/olivine LiFePO4 composites cathode for lithium ion batteries

    Science.gov (United States)

    Gong, Chunli; Xue, Zhigang; Wen, Sheng; Ye, Yunsheng; Xie, Xiaolin

    2016-06-01

    In the past two decades, LiFePO4 has undoubtly become a competitive candidate for the cathode material of the next-generation LIBs due to its abundant resources, low toxicity and excellent thermal stability, etc. However, the poor electronic conductivity as well as low lithium ion diffusion rate are the two major drawbacks for the commercial applications of LiFePO4 especially in the power energy field. The introduction of highly graphitized advanced carbon materials, which also possess high electronic conductivity, superior specific surface area and excellent structural stability, into LiFePO4 offers a better way to resolve the issue of limited rate performance caused by the two obstacles when compared with traditional carbon materials. In this review, we focus on advanced carbon materials such as one-dimensional (1D) carbon (carbon nanotubes and carbon fibers), two-dimensional (2D) carbon (graphene, graphene oxide and reduced graphene oxide) and three-dimensional (3D) carbon (carbon nanotubes array and 3D graphene skeleton), modified LiFePO4 for high power lithium ion batteries. The preparation strategies, structure, and electrochemical performance of advanced carbon/LiFePO4 composite are summarized and discussed in detail. The problems encountered in its application and the future development of this composite are also discussed.

  10. Spectroscopic properties of LaZnPO polycrystals doped with Nd{sup 3+} ions

    Energy Technology Data Exchange (ETDEWEB)

    Lemański, K. [Institute of Low Temperature and Structure Research Polish Academy of Sciences, Department of Spectroscopy of Excited States, ul. Okólna 2, 50-422 Wrocław (Poland); Babij, M. [Institute of Low Temperature and Structure Research Polish Academy of Sciences, Department of Spectroscopy of Excited States, ul. Okólna 2, 50-422 Wrocław (Poland); University of Wrocław, Faculty of Chemistry, ul. F. Joliot-Curie 14, 50-383 Wrocław (Poland); Ptak, M.; Bukowski, Z. [Institute of Low Temperature and Structure Research Polish Academy of Sciences, Department of Spectroscopy of Excited States, ul. Okólna 2, 50-422 Wrocław (Poland); Dereń, P.J., E-mail: P.Deren@int.pan.wroc.pl [Institute of Low Temperature and Structure Research Polish Academy of Sciences, Department of Spectroscopy of Excited States, ul. Okólna 2, 50-422 Wrocław (Poland)

    2015-09-15

    LaZnPO phosphide oxide was synthesized by a solid state reaction. The crystal structure has been confirmed using the X-Ray Powder Diffraction. LaZnPO possesses a tetragonal crystal structure with a space group P4/nmm. The absorption, FTIR, Raman and luminescence spectra have been measured and analyzed. For the neodymium(III) ions the spectroscopic quality parameter and the luminescence branching ratio were estimated from the emission spectra. The investigated crystals may find applications as a down-shifting material, to enhance the yield of solar cells. - Highlights: • Spectroscopic properties of LaZnPO:Nd{sup 3+} were investigated for the first time. • Broad absorption band occurs in the visible range. • The energy transfer from the host to the doped Nd{sup 3+} ions occurs. • The Stark energy levels of Nd{sup 3+} ions in LaZnPO were obtained. • LaZnPO:Nd{sup 3+} may find applications as a down-shifting material.

  11. Luminescence and scintillation properties of LuPO{sub 4}-Ce nanoparticles

    Energy Technology Data Exchange (ETDEWEB)

    Vistovskyy, V., E-mail: vistvv@gmail.com [Ivan Franko National University of Lviv, 8 Kyryla i Mefodiya, 79005 Lviv (Ukraine); Malyy, T. [Ivan Franko National University of Lviv, 8 Kyryla i Mefodiya, 79005 Lviv (Ukraine); Pushak, A. [Ukraine Academy of Printing, 19 Pidgolosko Str., 79020 Lviv (Ukraine); Vas’kiv, A. [Ivan Franko National University of Lviv, 8 Kyryla i Mefodiya, 79005 Lviv (Ukraine); Shapoval, A.; Mitina, N. [Lviv Polytechnic National University, 12 S. Bandera, 79013 Lviv (Ukraine); Gektin, A. [Institute for Scintillation Materials, NAS of Ukraine, 60 Lenina Avenue, 61001 Kharkiv (Ukraine); Zaichenko, A. [Lviv Polytechnic National University, 12 S. Bandera, 79013 Lviv (Ukraine); Voloshinovskii, A. [Ivan Franko National University of Lviv, 8 Kyryla i Mefodiya, 79005 Lviv (Ukraine)

    2014-01-15

    Study of the spectral-luminescence parameters of LuPO{sub 4}-Ce nanoparticles upon the excitation by X-ray quanta and synchrotron radiation with photon energies of 4–25 eV was performed. Nanoparticles with mean size about a=35 nm and nanoparticles with size less than 12 nm reveal the different structures of cerium centers. Luminescence efficiency of LuPO{sub 4}-Ce nanoparticles of a<12 nm size strongly decreases upon the excitation in the range of band-to-band transitions as well as in the case of X-ray excitation. -- Highlights: • Luminescence of LuPO{sub 4}-Ce nanoparticles studied using synchrotron and X-ray excitation. • Different structure of Ce{sup 3+}-centers has been revealed for LuPO{sub 4}-Ce nanoparticles. • Luminescence of LuPO{sub 4}-Ce with size less than 12 nm is strongly quenched upon the X-ray excitation.

  12. Palubní počítač pro automobil

    OpenAIRE

    Jelínek, Lubomír

    2012-01-01

    Tato práce pojednává o návrhu palubního počítače pro osobní automobil. Shrnuje základní znalosti o řídicí jednotce, palubním počítači a dalších počítačích vozu. Seznamuje s diagnostickým protokolem OBD a jeho využitím pro čtení dat z řídicí jednotky. Je zde popsáno i konkrétní řešení modulárního palubního počítače. V závěru práce jsou navrženy postupy, jak palubní počítač rozšířit. This thesis is about design car board computer for car. It summarizes basic knowledge about engine control un...

  13. Facile preparation of porous LiFePO{sub 4}/C composite granules by mechanical process

    Energy Technology Data Exchange (ETDEWEB)

    Kozawa, Takahiro, E-mail: t-kozawa@jwri.osaka-u.ac.jp; Kataoka, Noriaki; Kondo, Akira; Nakamura, Eri; Abe, Hiroya; Naito, Makio

    2015-04-01

    Lithium iron phosphate (LiFePO{sub 4}) which is a promising cathode material for lithium-ion batteries requires particle size reduction, carbon coating and granulation to improve its electrochemical performances and increase the energy densities. In addition, their composite granules desire a porous structure in order to assist the penetration of liquid electrolyte. Here, we report a facile preparation of porous LiFePO{sub 4}/C composite granules by a mechanical method using an attrition-type mill. By the mechanical treatment of starting materials, LiFePO{sub 4}/C composite granules with an average pore size of 20–30 nm were synthesized in one-step process without atmosphere control and external heating. This simple mechanical technique does not require additional pore forming agents. According to the cell tests, a favorable cycle performance was exhibited. - Highlights: • Porous LiFePO{sub 4}/C composite granule was synthesized by one-pot mechanical process. • LiFePO{sub 4} was formed without atmosphere control and external heating. • Gases released from raw materials act as pore forming agents. • A favorable cycle performance was exhibited.

  14. Preparation and Characterisation of LiFePO4/CNT Material for Li-Ion Batteries

    Directory of Open Access Journals (Sweden)

    Rushanah Mohamed

    2011-01-01

    Full Text Available Li-ion battery cathode materials were synthesised via a mechanical activation and thermal treatment process and systematically studied. LiFePO4/CNT composite cathode materials were successfully prepared from LiFePO4 material. The synthesis technique involved growth of carbon nanotubes onto the LiFePO4 using a novel spray pyrolysis-modified CVD technique. The technique yielded LiFePO4/CNT composite cathode material displaying good electrochemical activity. The composite cathode exhibited excellent electrochemical performances with 163 mAh/g discharge capacity with 94% cycle efficiency at a 0.1 C discharge rate in the first cycle, with a capacity fade of approximately 10% after 30 cycles. The results indicate that carbon nanotube addition can enable LiFePO4 to display a higher discharge capacity at a fast rate with high efficiency. The research is of potential interest for the application of carbon nanotubes as a new conducting additive in cathode preparation and for the development of high-power Li-ion batteries for hybrid electric vehicles.

  15. Scientist-Educator Partnerships: the Cornerstone of Astrophysics E/PO

    Science.gov (United States)

    Meinke, Bonnie K.; Smith, Denise A.; Lawton, Brandon; Eisenhamer, Bonnie; Jirdeh, Hussein

    2015-11-01

    For nearly two decades, NASA has partnered scientists and educators by embedding Education and Public Outreach (E/PO) programs and funding in its science missions and research activities. This enables scientist and educators to work side-by-side in translating cutting-edge NASA science and technology for classrooms, museums, and public venues.The Office of Public Outreach at the Space Telescope Science Institute (STScI) is uniquely poised to foster collaboration between scientists with content expertise and educators with pedagogy expertise. As home to both Hubble Space Telescope and the future James Webb Space Telescope, STScI leverages the expertise of its scientists to create partnerships with its collocated Education Team to translate cutting-edge NASA science into new and effective learning tools. In addition, STScI is home of the NASA Science Mission Directorate (SMD) Astrophysics Science E/PO Forum, which facilitates connections both within the SMD E/PO community and beyond to scientists and educators across all NASA Astrophysics missions. These collaborations strengthen partnerships, build best practices, and enhance coherence for NASA SMD-funded E/PO missions and programs.We will present examples of astronomers’ engagement in our E/PO efforts, such as NASA Science4Girls.

  16. Crystal growth and characterization of CeFe{sub 1-x}Ru{sub x} PO

    Energy Technology Data Exchange (ETDEWEB)

    Balle, Tanita; Kliemt, Kristin; Krellner, Cornelius [Goethe Universitaet Frankfurt, Kristall- und Materiallabor (Germany)

    2016-07-01

    CeRuPO is a one of the few heavy fermion systems, which order ferromagnetically at low temperatures (T{sub C} = 15 K), because of dominant RKKY-interaction. CeFePO on the other hand shows no long-range magnetic order even at low temperatures because of dominant Kondo effect (T{sub K} = 10 K). By substituting CeFePO with ruthenium we can reach a quantum critical point, at which the RKKY-interaction and the Kondo effect are equally strong. To study the quantum critical point, and to enlighten the question if the order stays ferromagnetically down to lowest temperatures, high quality crystals are needed. Here, the growth and characterization of the single crystals will be discussed. We obtained mm-sized single crystals of the unsubstituted CeRuPO and CeFePO by a modified Bridgeman method using tin as a flux. The quality of the crystals was verified by Powder-X-Ray-Diffraction, energy dispersive X-ray spectroscopy and Laue backscattering.

  17. Synthesis of surface oxygen-deficient BiPO{sub 4} nanocubes with enhanced visible light induced photocatalytic activity

    Energy Technology Data Exchange (ETDEWEB)

    Shi, Bingtao; Yin, Haoyong; Li, Tao; Gong, Jianying; Lv, Shumei; Nie, Qiulin, E-mail: yhy@hdu.edu.cn [College of Materials & Environmental Engineering, Hangzhou Dianzi University, Hangzhou (China)

    2017-05-15

    The visible light driven BiPO{sub 4} nanocubes with sufficient surface oxygen deficiency were fabricated by a hydrothermal process and subsequently ultrasonic assistant Fe reduction process. The products were characterized by XRD, DRS, XPS, SEM and TEM which showed that the BiPO{sub 4} had cuboid-like shape with a smooth surface and clear edges and the oxygen vacancies were successfully introduced on the surface of the BiPO{sub 4} nanocubes. The as prepared oxygen-deficient BiPO{sub 4} nanocubes showed greatly enhanced visible light induced photocatalytic activity in degradation of Rhodamine B. The enhanced photocatalytic performance and expanded visible light response of BiPO{sub 4} may be due to the introduction of surface oxygen vacancies which can generate the oxygen vacancies mid-gap states lower to the conduction band of BiPO{sub 4}. (author)

  18. Crystalline maricite NaFePO4 as a positive electrode material for sodium secondary batteries operating at intermediate temperature

    Science.gov (United States)

    Hwang, Jinkwang; Matsumoto, Kazuhiko; Orikasa, Yuki; Katayama, Misaki; Inada, Yasuhiro; Nohira, Toshiyuki; Hagiwara, Rika

    2018-02-01

    Maricite NaFePO4 (m-NaFePO4) was investigated as a positive electrode material for intermediate-temperature operation of sodium secondary batteries using ionic liquid electrolytes. Powdered m-NaFePO4 was prepared by a conventional solid-state method at 873 K and subsequently fabricated in two different conditions; one is ball-milled in acetone and the other is re-calcined at 873 K after the ball-milling. Electrochemical properties of the electrodes prepared with the as-synthesized m-NaFePO4, the ball-milled m-NaFePO4, and the re-calcined m-NaFePO4 were investigated in Na[FSA]-[C2C1im][FSA] (C2C1im+ = 1-ethyl-3-methylimidazolium, FSA- = bis(fluorosulfonyl)amide) ionic liquid electrolytes at 298 K and 363 K to assess the effects of temperature and particle size on their electrochemical properties. A reversible charge-discharge capacity of 107 mAh g-1 was achieved with a coulombic efficiency >98% from the 2nd cycle using the ball-milled m-NaFePO4 electrode at a C-rate of 0.1 C and 363 K. Electrochemical impedance spectroscopy using m-NaFePO4/m-NaFePO4 symmetric cells indicated that inactive m-NaFePO4 becomes an active material through ball-milling treatment and elevation of operating temperature. X-ray diffraction analysis of crystalline m-NaFePO4 confirmed the lattice contraction and expansion upon charging and discharging, respectively. These results indicate that the desodiation-sodiation process in m-NaFePO4 is reversible in the intermediate-temperature range.

  19. Synthesis of LiFePO4/Pani/C composite as a cathode material for lithium ion battery

    Science.gov (United States)

    Rahayu, Iman; Hidayat, Sahrul; Aryadi, Lutfi

    2016-02-01

    In recent years, LiFePO4 studied intensively as a cathode material for Li-ion batteries because of high theoretical capacity, stability, and environmental friendly. However, its low intrinsic electronic conductivity. One way to improve its conductivity is addition of conductive material. Polyaniline (PANI) is one of the conductive polymer materials that widely studied because its unique physical and chemical properties which can be an insulator and conductor by doping-dedoping processes and has large potential application. The purpose of this research is to improve the conductivity of LiFePO4 with conductive polymer PANI. The method is performed by the addition of LiFePO4 during the polymerization process to form LiFePO4 polyaniline then added to the C-PANI with the addition of mass percent variation of 5%, 10%, 15%, 20% form-LiFePO4 composite PANI-C. In LiFePO4 added during polymerization PANI provide a smooth surface profile after composited with the carbon to LiFePO4-PANI-C compared to LiFePO4-C. LiFePO4-PANI-C composite provided higher conductivity is 18.45×10-4 S/cm compared to LiFePO4-C is 10.48×10-4 S/cm at 20% addition of carbon. This is due to PANI in LiFePO4 is added to the polyaniline polymerization process can act as a conductive adhesive to glue between carbon and LiFePO4.

  20. Lifetime Estimation of the Nanophosphate LiFePO4/C Battery Chemistry Used in Fully Electric Vehicles

    DEFF Research Database (Denmark)

    Swierczynski, Maciej Jozef; Stroe, Daniel Loan; Stroe, Ana-Irina

    2015-01-01

    , and intrinsic safety of the nanophosphate LiFePO4/C Li-ion chemistry make it possible to consider this chemistry for electric vehicle (EV) applications. This paper investigates the lifetime of the nanophosphate LiFePO4/C battery chemistry when it is used for full electrical vehicles. The investigation...... is used to study the capacity and power capability degradation behavior of the tested nanophosphate LiFePO4/C battery for two EV operational scenarios....

  1. 21 CFR 862.1120 - Blood gases (PCO2, PO2) and blood pH test system.

    Science.gov (United States)

    2010-04-01

    ... 21 Food and Drugs 8 2010-04-01 2010-04-01 false Blood gases (PCO2, PO2) and blood pH test system... Test Systems § 862.1120 Blood gases (PCO2, PO2) and blood pH test system. (a) Identification. A blood gases (PCO2, PO2) and blood pH test system is a device intended to measure certain gases in blood, serum...

  2. {sup 210}Po in marine organisms consumed by the population of Seville; {sup 210}PO en organismos marinos consumidos por la poblacion sevillana

    Energy Technology Data Exchange (ETDEWEB)

    Diaz-Frances, I.; Mantero, J.; Manjon, G.; Garcia-Tenorio, R.

    2011-07-01

    The natural radionuclide {sup 210}Po is one belonging to the series of uranium, which is ubiquitously present in trace quantities in the various environmental compartments (water, soil, air) and through its route along the food chain may end incorporated into the human body via food or water intake. This radionuclide is highly radio toxic, presenting the highest value for the ingestion dose coefficient for adults. The Spanish population is an important component of their diet to marine products. found higher values of ingestion dose in the Spanish population compared to other European populations where the culture of introducing fish into your diet is not so entered. The study detailed here estimates the contribution of {sup 2}10Po to the ingestion dose received by the Sevillian population due to consumption of fish, mollusks and crustaceans. The results obtained in this study will be presented and discussed in this paper. (Author)

  3. Comment écrire des vers quand on ne veut pas être poète

    Directory of Open Access Journals (Sweden)

    Annick Ettlin

    2011-09-01

    Full Text Available Qu’elle soit considérée comme un événement biographique indiscutable ou comme l’un des éléments du mythe que le poète, « se voyant se voir », élabore autour de sa propre personne, la nuit du quatre au cinq octobre 1892 est le théâtre d’une insomnie pour le moins décisive : Paul Valéry, jeune poète de vingt-et-un ans, admirateur fervent des symbolistes et disciple officiel de Stéphane Mallarmé, y décide d’abandonner toute activité liée à la poésie. Pour le dire autrement, dans des termes autan...

  4. Direct regeneration of recycled cathode material mixture from scrapped LiFePO4 batteries

    Science.gov (United States)

    Li, Xuelei; Zhang, Jin; Song, Dawei; Song, Jishun; Zhang, Lianqi

    2017-03-01

    A new green recycling process (named as direct regeneration process) of cathode material mixture from scrapped LiFePO4 batteries is designed for the first time. Through this direct regeneration process, high purity cathode material mixture (LiFePO4 + acetylene black), anode material mixture (graphite + acetylene black) and other by-products (shell, Al foil, Cu foil and electrolyte solvent, etc.) are recycled from scrapped LiFePO4 batteries with high yield. Subsequently, recycled cathode material mixture without acid leaching is further directly regenerated with Li2CO3. Direct regeneration procedure of recycled cathode material mixture from 600 to 800 °C is investigated in detail. Cathode material mixture regenerated at 650 °C display excellent physical, chemical and electrochemical performances, which meet the reuse requirement for middle-end Li-ion batteries. The results indicate the green direct regeneration process with low-cost and high added-value is feasible.

  5. La figure du roi et le point de vue du poète

    OpenAIRE

    Buron, Emmanuel

    2009-01-01

    Parler des Discours de Jules Cesar avant le passage du Rubicon, d’Étienne Jodelle, dans le cadre d’un colloque sur César au Moyen Âge et à la Renaissance est à la fois évident et paradoxal. Évident, parce que le titre de ce poème indique d’emblée qu’il prend pour objet principal un épisode-clé de l’histoire du général romain. En outre, ce texte constitue la plus ambitieuse des entreprises poétiques du poète : selon Charles de la Mothe, qui préface les Œuvres et meslanges poetiques, édition de...

  6. Study on SOC wavelet analysis for LiFePO4 battery

    Science.gov (United States)

    Liu, Xuepeng; Zhao, Dongmei

    2017-08-01

    Improving the prediction accuracy of SOC can reduce the complexity of the conservative and control strategy of the strategy such as the scheduling, optimization and planning of LiFePO4 battery system. Based on the analysis of the relationship between the SOC historical data and the external stress factors, the SOC Estimation-Correction Prediction Model based on wavelet analysis is established. Using wavelet neural network prediction model is of high precision to achieve forecast link, external stress measured data is used to update parameters estimation in the model, implement correction link, makes the forecast model can adapt to the LiFePO4 battery under rated condition of charge and discharge the operating point of the variable operation area. The test results show that the method can obtain higher precision prediction model when the input and output of LiFePO4 battery are changed frequently.

  7. Posibles adiciones al corpus poético del Conde de Salinas

    OpenAIRE

    Dadson, T.J. (Trevor J.)

    1988-01-01

    Se agregan poemas del Conde de Salinas, Diego de Silva y Mendoza, que no se incluyeron en la Antología Poética, publicada por el autor del artículo en 1985. Se trata de la edición de tres sonetos, dos letrillas y unas redondillas incluídas como posibles (no hay seguridad de autoría al cien por cien) o probables adiciones al corpus poético del Conde de Salinas. Some poems by Diego de Silva y Mendoza, Count of Salinas, that were not included in the Antología Poética published by the author of t...

  8. Longitudinal relaxation of ND4D2PO4 type antiferroelectrics. Piezoelectric resonance and sound attenuation

    Directory of Open Access Journals (Sweden)

    R.R. Levitskii

    2009-01-01

    Full Text Available Within the framework of the modified proton model with taking into account the interaction with the shear strain ε6, a dynamic dielectric response of ND4D2PO4 type antiferroelectrics is considered. Dynamics of the piezoelectric strain is taken into account. Experimentally observed phenomena of crystal clamping by high frequency electric field, piezoelectric resonance and microwave dispersion are described. Ultrasound velocity and attenuation are calculated. Character of behaviour of attenuation in the paraelectric phase and the existence of a cut-off frequency in the frequency dependence of attenuation are predicted. At the proper choice of the parameters, a good quantitative description of experimental data for longitudinal static dielectric, piezoelectric and elastic characteristics and sound velocity for ND4D2PO4 and NH4H2PO4 is obtained in the paraelectric phase.

  9. Magnetoelectric susceptibility and magnetic symmetry of magnetoelectrically annealed TbPO4

    Science.gov (United States)

    Rado, G. T.; Ferrari, J. M.; Maisch, W. G.

    1984-04-01

    Measurements are presented of the magnetoelectric (ME) susceptibility tensor α of TbPO4 crystals which were ME annealed by a method introduced in the present paper and termed "balanced" ME annealing. The form of α shows that below the Néel temperature the magnetic symmetry of such crystals is tetragonal (point group 4'm'mm'), in contrast to the lower symmetry which describes non-ME-annealed TbPO4 crystals. Thus the distortion existing in the latter crystals is suppressed by ME annealing. Also measured are the magnitude (which is larger than in any other known material) and temperature dependence of the single independent component of α. The improved experimental methods presented include, besides the balanced ME annealing, the simultaneous observation of two components of α, and a modified procedure for the growth of TbPO4 crystals. Magnetoelectric switching, memory, and hysteresis effects are also reported.

  10. Comparative studies on Ag{sub 3}PO{sub 4}/BiPO{sub 4}–metal-organic framework–graphene-based nanocomposites for photocatalysis application

    Energy Technology Data Exchange (ETDEWEB)

    Mohaghegh, N. [Department of Chemistry, Sharif University of Technology, Azadi Avenue, Tehran (Iran, Islamic Republic of); Tasviri, M., E-mail: m_tasviri@sbu.ac.ir [Department of Chemistry, Shahid Beheshti University, Evin, P.O. Box 19839-63113, Tehran (Iran, Islamic Republic of); Rahimi, E. [Department of Mining Engineering, Islamic Azad University, South Tehran Branch, Tehran (Iran, Islamic Republic of); Gholami, M.R., E-mail: gholami@sharif.edu [Department of Chemistry, Sharif University of Technology, Azadi Avenue, Tehran (Iran, Islamic Republic of)

    2015-10-01

    Graphical abstract: - Highlights: • Novel Ag{sub 3}PO{sub 4}/BiPO{sub 4} (AB)–graphene-based photocatalysts were reported. • Photocatalytic degradation mechanism of Atrazine herbicide was investigated. • It was divulged that the photodegradation is increased by AB supporting. • Enhanced photodegradation has been obtained by the AB/Cu(tpa).GR nanocomposite. • The unique heterojunction formed by coupling Cu(tpa) with GR caused high activity. - Abstract: For the first time, we report novel Ag{sub 3}PO{sub 4}/BiPO{sub 4} (AB)–graphene-based photocatalysts. The fabricated nanocomposites were characterized by various techniques. The photocatalytic properties of the prepared catalysts were evaluated by the photodegradation of Atrazine herbicide under both visible and UV light irradiation. Atrazine concentration was determined using the spectrophotometric method according to the Konig's reaction by monitoring the absorbance at 470 nm wavelength during the photodegradation process. Both degradation rate and efficiency using graphene (GR)-based nanocomposites are found to be much better than using pure AB. Atrazine photodegradation displayed that the AB supporting is an important point to become a great photocatalyst for this reaction. Enhanced photodegradation has been obtained by the AB/Cu(tpa).GR nanocomposite. The results showed that the novel synthesized AB/Cu(tpa).GR nanocomposite exhibits a dramatic separation of photogenerated electron/hole pairs. This was accounted for by the improved efficiency of an interfacial charge separation, thanks to the unique heterojunction formed by coupling Cu(tpa) with GR. Chemical oxygen demand of herbicide solution was measured and it posed a good idea about Atrazine herbicide degradation.

  11. Proton conductivity, structural and thermal properties of (1- x) CsH2PO4- xBa(H2PO4)2

    Science.gov (United States)

    Ponomareva, V. G.; Bagryantseva, I. N.

    2017-09-01

    The structural, electrotransport, and thermodynamic properties of the (1- x)CsH2PO4- xBa(H2PO4)2 system in a wide range of compositions ( x = 0.1-0.4) were firstly studied to develop the highly conductive proton electrolytes within the medium-temperature range. At x = 0—0.1, formation of disordered substitutional solid solutions, isostructural to CsH2PO4 ( P21/ m), with a decrease of the unit cell parameters and considerable increase of proton conductivity as a result of formation of vacancies in the cesium sublattice and weakening of the system of hydrogen bonds, was observed. At x = 0.15-0.4, the heterophase highly conductive systems demonstrating high values of proton conductivity 10-2 S/cm at x = 0.15—0.2, stable under the long-term isothermal exposures and low humidity ( T 200—210°C, RH 15%), are formed. The phase transition disappears, the energy of activation of conductivity decreases from 0.9 to 0.55 eV at x = 0.2. The conductivity of high-temperature phase does not vary with Ba(H2PO4)2 fraction increase to x = 0.2. The mechanisms of transfer of protons were discussed. It has been shown that when x > 0.10 the contribution to proton conductivity of molecules of the water adsorbed on the phase boundary of the composite systems increases.

  12. Bu4NSO4SnPh3•Ph3PO: SYNTHESIS AND SPECTROSCOPIC STUDIES

    Directory of Open Access Journals (Sweden)

    Bernard Mahieu

    2011-02-01

    Full Text Available On allowing Bu4NSO4SnPh3 to react with Ph3PO, the adduct Bu4NSO4SnPh3•Ph3PO is obtained. The IR and Mössbauer data allow to conclude to the cleavage of the Bu4NSO4SnPh3 chain and the coordination of Ph3PO to the tin (IV centre leading to discrete ionic structure containing a trans bipyramidal trigonal SnC3O2 arrangement with SO42- and Ph3PO being in an apical positions.

  13. Linker length and flexibility induces new cellobiohydrolase activity of PoCel6A from Penicillium oxalicum.

    Science.gov (United States)

    Gao, Le; Wang, Lushan; Jiang, Xukai; Qu, Yinbo

    2015-06-01

    In a previous study, a novel cellobiohydrolase, PoCel6A, with new enzymatic activity against p-nitrophenyl-β-D-cellobioside (pNPC), was purified from Penicillium oxalicum. The cellulose-binding module and catalytic domain of PoCel6A showed a high degree of sequence similarity with other fungal Cel6As. However, PoCel6A had 11 more amino acids in the linker region than other Cel6As. To evaluate the relationship between the longer linker of PoCel6A and its enzymatic activity, 11 amino acids were deleted from the linker region of PoCel6A. The shortened PoCel6A linker nullified the enzymatic activity against pNPC but dramatically increased the enzyme's capacity for crystalline cellulose degradation. The shortened linker segment appeared to have no effect on the secondary structural conformation of PoCel6A. Another variant (PoCel6A-6pro) with six consecutive proline residues in the interdomain linker had a higher rigid linker, and no enzymatic activity was observed against soluble and insoluble substrate. The flexibility of the linker had an important function in the formation of active cellulase. The length and flexibility of the linker is clearly able to modify the function of PoCel6A and induce new characteristics of Cel6A. Copyright © 2015 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

  14. Anion/Cation-Controlled Morphology Evolution of Bi1- x PO4: xEu3+ and Enhanced Luminescence Properties

    Science.gov (United States)

    Shi, Xiaolei; Zhang, Jin; Liu, Yun; Chen, Yubai; Zhang, Kun; Qiao, Xianrong; Zuo, Haoqiang; Li, Peng; Li, Jinyang

    2016-01-01

    A series of BiPO4:Eu3+ phosphors were hydrothermally synthesized by varying the molar ratio of PO4 3-/[Bi3++Eu3+] and the Eu3+ ions concentration in the precursor mixture. X-ray diffraction (XRD), field-emission scanning electronic microscopy (SEM) and photoluminescence (PL) spectra were employed to characterize the structure, morphology and luminescence properties of the as-synthesized phosphors. The XRD results indicate that the crystal structure of the BiPO4:Eu3+ samples are low-temperature monoclinic phase. The SEM observations reveal that the BiPO4:Eu3+ powders morphologies vary from octahedral-like to rod-like with increasing molar ratio of PO4 3-/[Bi3++Eu3+]. The PL spectra suggest that the emission intensity of the BiPO4:Eu3+ phosphors significantly enhances when the molar ratio of PO4 3-/[Bi3++Eu3+] is greater than 1.0. Therefore, the luminescence properties of BiPO4:Eu3+ phosphors can be improved effectively through controlling the molar ratio of PO4 3-/[Bi3++Eu3+] in the precursor mixture, which may provide an important reference for designing new luminescent materials.

  15. Synthesis and magnetic properties of LiFePO4 substitution magnesium

    Science.gov (United States)

    Choi, Hyunkyung; Kim, Min Ji; Hahn, Eun Joo; Kim, Sam Jin; Kim, Chul Sung

    2017-06-01

    LiFe0.9Mg0.1PO4 sample was prepared by using a solid-state reaction method, and the temperature-dependent magnetic properties of the sample were studied. The X-ray diffraction (XRD) pattern showed an olivine-type orthorhombic structure with space group Pnma based on Rietveld refinement method. The effect of Mg substitution in antiferromagnetic LiFe0.9Mg0.1PO4 was investigated using a vibrating sample magnetometer (VSM) and Mössbauer spectroscopy. The temperature-dependence of the magnetization curves of LiFe0.9Mg0.1PO4 shows abnormal antiferromagnetic behavior with ordering temperature. Sudden changes in both the magnetic hyperfine field (Hhf) and its slope below 15 K suggest that magnetic phase transition associated to the abrupt occurrence of spin-reorientation. The Néel temperature (TN) and spin-reorientation temperature (TS) of LiFe0.9Mg0.1PO4 are lower than those of pure LiFePO4 (TN = 51 K, TS = 23 K). This is due to the Fe-O-Fe superexchange interaction being larger than that of the Fe-O-Mg link. Also, we have confirmed a change in the electric quadrupole splitting (ΔEQ) by the spin-orbit coupling effect and the shape of Mössbauer spectrum has provided the evidence for TS and a strong crystalline field. We have found that Mg ions in LiFe0.9Mg0.1PO4 induce an asymmetric charge density due to the presence of Mg2+ ions at the FeO6 octahedral sites.

  16. Research on high rate capabilities B-substituted LiFePO4.

    Science.gov (United States)

    Wang, Fu; Zhang, Yun; Chen, Chao

    2013-02-01

    LiFePO4 is currently recognized as one of the most promising electrode materials for large-scale application of lithium ion batteries. However, the limitation of rate capability is believed to be intrinsic to this family of compounds due to the existence of larger tetrahedral (PO4)3- unit and quasi-hexagonal close-packed oxygen array. This paper report here a systematic investigation of the enhancement of rate performance by partly substitution of light small triangle oxyanion, (BO3)3-, for the larger tetrahedral (PO4)3- units in LiFePO4. Cathode electrode materials LiFeB(x)P(1_x)O(4-delta), in which X = 0, 3, 6 and 9, mol%, were synthesized by solid-state method. The as-synthesized products were characterized by X-Ray Diffraction (XRD), Scanning Electron Microscope (SEM) and Electrochemical Measurements. The results showed that 6 mol% of boron substitution had no effect on the structure of LiFePO4 material, but significantly improved its rate performance. The initial discharge capacity of the LiFeB0.06P0.94O(4-delta) sample was 145.62 mAh/g at 0.1 C, and the capacity retention ratios of 81% at 2 C and 76% at 5 C were obtained, demonstrating that a proper amount of boron substitution (lower than 6 mol%) could significantly improve the rate performance of LiFePO4 cathode material.

  17. Vibrational spectroscopic study of nickel(II) hypophosphite, Ni(H 2PO 2) 2

    Science.gov (United States)

    Bickley, R. I.; Edwards, H. G. M.; Gustar, R. E.; Tait, J. K. F.

    1992-10-01

    The vibrational spectrum of nickel(II) hypophosphite is reported for the first time. A comparison between the solid-state Raman spectrum and that of a 0.6 M aqueous solution of nickel(II) hypophosphite with sodium hypophosphite indicates the presence of a bidentate monohypophosphito complex, Ni(H 2PO 2) +, and hypophosphite ions H 2PO -2 in the solid state, with dissociation into hexa-aquo nickel(II) ions and hypophosphite ions in aqueous solution. This is compared with the behaviour of nickel(II) carboxylates in the solid state and in aqueous solution.

  18. A tientas por el laberinto poético de León de Greiff

    Directory of Open Access Journals (Sweden)

    Otto Morales Benítez

    1978-12-01

    Full Text Available Ensayo de ensayo, llama Lino Gil Jaramillo su libro, A tientas por el laberinto poético de León de Greiff. Es un estudio serio, haciendo rodeos y aproximaciones en torno a uno de los grandes valores poéticos de América Latina. Conocedor profundo de su obra, por estudio y análisis permanente, y por la misma cercanía a la amistad de León de Greiff, este testimonio es uno de los más ambiciosos tendiente a descubrir todo el intrincado valor del mensaje del poeta.

  19. Carbon Surface Layers on a High-Rate LiFePO4

    Energy Technology Data Exchange (ETDEWEB)

    Gabrisch, Heike; Wilcox, James D.; Doeff, Marca M.

    2005-09-06

    Transmission electron microscopy (TEM) was used to image particles of a high-rate LiFePO4 sample containing a small amount of in situ carbon. The particle morphology is highly irregular, with a wide size distribution. Nevertheless, coatings, varying from about 5-10 nm in thickness, could readily be detected on surfaces of particles as well as on edges of agglomerates. Elemental mapping using Energy Filtered TEM (EFTEM) indicates that these very thin surface layers are composed of carbon. These observations have important implications for the design of high-rate LiFePO4 materials in which, ideally, a minimal amount of carbon coating is used.

  20. TEM Studies of Carbon Coated LiFePO4 after Charge DischargeCycling

    Energy Technology Data Exchange (ETDEWEB)

    Gabrisch, H.; Wilcox, J.; Doeff, M.

    2006-11-30

    Carbon coating has proven to be a successful approach toimprove the rate capability of LiFePO4 used in rechargeable Li-ionbatteries. Investigations of the microstructure of carbon coated LiFePO4after charge discharge cycling shows that the carbon surface layerremains intact over 100 cycles. We find micro cracks in the cycledmaterial that extend parallel to low indexed lattice planes. Ourobservations differ from observations made by other authors. However thedifferences between the orientations of crack surfaces in both studiescan be reconciled considering the location of weak bonds in the unit celland specimen geometry as well as elastic stress fields ofdislocation.

  1. Projekt koncepcyjny zagospodarowania siedliska wiejskiego na południowym Mazowszu

    OpenAIRE

    Margot Dudkiewicz; Wojciech Durlak; Marzena Parzymies; Ewa Grela

    2014-01-01

    Celem pracy było opracowanie projektu koncepcyjnego siedliska wiejskiego w miejscowości Bukówno, gm. Radzanów. W projekcie uwzględniono elementy charakterystyczne dla wsi położonej w regionie Ziemi Białobrzeskiej, na południowym Mazowszu. Ogród zajmuje powierzchnię 2600 m2. Na terenie przeprowadzono inwentaryzację szaty roślinnej, analizę wybranych elementów środowiska i powiązań widokowych, a na podstawie uzyskanych informacji wykonano projekt zagospodarowania działki.

  2. Rising from the Dead: the Revival of the EUVE E/PO

    Science.gov (United States)

    Cullison, J. L.; Craig, N.; Stroozas, B. A.; Malina, R. F.

    2000-05-01

    NASA's Extreme Ultraviolet Explorer (EUVE) is dedicated to gathering data on our sky via instrumentation sensitive to the region of light between 76 and 760 angstroms. Since the all-sky survey was completed in 1993, astronomers have made studies of selected objects with EUVE to determine their physical properties and chemical compositions. Also, they have learned about the conditions that prevail and the processes at work in stars, planets, and other sources of EUV radiation. In its pre-launch and early prime mission, EUVE had a thriving education and public outreach (E/PO) program formed expressly to spread the word on recent EUVE findings, but due to budgetary restraints in its extended mission, the project has been unable in recent years to support extensive E/PO efforts. Now in it's eighth year of operation, the EUVE Project has revived its E/PO efforts without significantly impacting its shoe-string budget. Web sites are being reconstructed, including sophisticated interactive learning environments where elementary through college level students, teachers, and the general public can select from lesson plans including, for example, an introductory astronomical module on the relationship between spectra and object classification, download three-dimensional cutouts of the EUVE skymap, view a slide show on the history and instrumentation of the satellite, take a virtual tour of the EUVE observatory, find where EUVE is in its orbit, and catch up on EUVE's most recent news and events. EUVE's revived internet E/PO presence is supplemented with staff and technical support (up to 10% of each staff person's time) of hands-on elementary and community projects coordinated by the UC Berkeley Center for Science Education (the now independent offshoot of the original EUVE E/PO). All elements of the EUVE E/PO are supported without impacting the efficient and highly productive science goals of the small-staffed mission. Additional EUVE E/PO efforts in the works include

  3. A negritude poética do gaúcho Oliveira Silveira

    Directory of Open Access Journals (Sweden)

    Elisalva Madruga Dantas

    2016-01-01

    Full Text Available Refletindo sobre as expressões literárias e culturais afro-brasileiras e sobre o lugar ocupado por essas produ- ções na sociedade, o trabalho que se segue tem como objetivo uma análise ideo/estética da produção poética do gaúcho Oliveira Silveira, tendo em vista sobretudo sua relação com as propostas do movimento da Negritude e o diálogo que estabelece com poetas vinculados ao referido movimento. Palavras-chave: Negritude, poética, conscientização, paródia.

  4. The Digital Universe Coalition: Building a Prototype NVO E/PO Portal

    Science.gov (United States)

    Mendez, B.; Craig, N.; Haisch, B.; Lindblom, J.; Hanisch, R.; Summers, F.; Abbott, B.

    2004-05-01

    The National Virtual Observatory (NVO) holds tremendous potential for Education and Public Outreach (E/PO) opportunities. The possibilities for E/PO with the NVO, which promises to make widely available the great majority of the world's astronomical data, are too numerous for any one E/PO effort to ever hope to develop. Therefore, it is critical that the NVO E/PO program develop an infrastructure and tools flexible enough that any E/PO program can make use of it. In response to the recommendations of the NVO science definition team, UC Berkeley's SEGway program conducted needs assessment surveys of potential non-traditional (i.e. non-scientist) NVO user communities. The SEGway team wished to use the results of these surveys to design a demonstration website that could show some of the potential capabilities of NVO E/PO. SEGway established an informal partnership with STScI, AMNH/Hayden Planetarium, and ManyOne Network to explore how to assemble the infrastructure and tools for NVO E/PO and to construct a demonstration portal that makes use of NVO resources. We called this partnership The Digital Universe Coalition. This prototype displays AMNH/Hayden's Digital Universe star catalog of approximately 100,000 stars, based largely on HIPPARCOS parallaxes, in a virtual three-dimensional space. Three types of user-interactive data display and/or navigation are possible: an Earth-based view of the sky with the option of displaying constellations; a spaceship-based view moving through space; and a "god's-eye" view of the local neighborhood from an external vantage point. One key feature of this demo is the linking of user-selectable locations in the sky to the online Digitized Sky Survey data sets. A second feature is a set of links for educational content on a handful of selected objects. Both of these capabilities will be extended further as we plan to begin development of a much more robust and complete E/PO portal for the NVO.

  5. We Need You! The Importance of Scientist Involvement in Education and Public Outreach (E/PO)

    Science.gov (United States)

    Buxner, S.; Hsu, B. C.; Meinke, B. K.; Shipp, S. S.; Schwerin, T. G.; Peticolas, L. M.; Smith, D.; Dalton, H.

    2013-12-01

    Active engagement of scientists in education and public outreach (E/PO) activities is beneficial for scientists, classrooms, and the general public. Scientist visibility in the public arena is important to garner public support, whose tax dollars fund scientific programs. Scientists are important disseminators of current, accurate scientific knowledge. They also, perhaps more importantly, understand the nature and process of science and have the means of understanding and addressing many of the issues facing society. Research has shown that while the public is interested in science, not all members are necessarily scientifically literate; additionally there is evidence than many students are not prepared for, or choosing to participate in science careers. And yet, a scientifically engaged, literate, and supportive public is a necessary partner in addressing important global challenges of the future. E/PO is a wonderful opportunity for scientists to demonstrate that science is interesting, exciting, fun, challenging, and relevant to society. In doing so, they can transfer ownership of science to the public through a variety of vehicles by increasing access to scientific thought and discovery. Through partnerships with E/PO professionals, teachers, or journalists, scientists can improve their communication and teaching skills, whether in an E/PO setting or their higher education careers. Sharing with the public what scientists do is an effective way to engage people in the scientific process and to express scientists' enthusiasm for what they do. Scientist involvement in E/PO also shows the public that scientists are real people and provides important role models for the next generation of scientists. There are many opportunities to get involved in E/PO! Find information on EarthSpace, a national clearinghouse for higher education materials in Earth and space science through an abstract by Nicholas Gross, et al. Learn about NASA Science Mission Directorate (SMD

  6. Fragmentos iconográficos de uma poética do abandono

    OpenAIRE

    Rocha Neto, Manuel Alves da

    2016-01-01

    Esta pesquisa apresenta um levantamento iconográfico em torno das situações em que o abandono pode ser identificado nas representações da arte, inicialmente através de pinturas que apresentam imagens de moradores de rua, pedintes, mendigos e andarilhos, ampliando-se posteriormente para outros referenciais imagéticos e linguagens artísticas. Para esta pesquisa foi significativa minha memória afetiva e poética pessoal, relacionadas desde a infância a essas situações e seres. As poéticas do aban...

  7. El grafofonema (fonoletra en el discurso poético: mensaje para descifrar

    Directory of Open Access Journals (Sweden)

    Goncharenko Serguéi

    2003-06-01

    Full Text Available

    El artículo data de la formación de las estructuras fónicas como mecanismos comunicativos en el discurso poético, para generar mensajes, proporcionando tanto información semántica como estética dentro del umbral de la información poética, la cual permite tanto pérdida como incremento semántico en la poesía.

  8. Razvoj palijativne medicine u Požeško-slavonskoj županije

    OpenAIRE

    Vukoja, Ivan; Ivković, Jakov; Barišić, Fabijan; Puljašić, Darko; Asančaić, Ana; Njavro, Lana; Braš, Marijana; Đorđević, Veljko

    2017-01-01

    Iako je u Požegi još 1991. godine osnovan prvi hospicijski odjel u Hrvatskoj, palijativna skrb i medicina do današnjeg dana još nisu u potpunosti zaživjeli. Problem razvoja palijativne skrbi u Požeško–slavonskoj županiji osim nedostatnih financijskih sredstava predstavlja i geografska specifičnost i prometna izoliranost županije te manjak liječnika i drugih educiranih zdravstvenih profesionalaca. Županija je prema demografskim karakteristikama zakoračila u demografsku starost s naznakama doda...

  9. UV-light driven photocatalytic performance of hydrothermally-synthesized hexagonal CePO4 nanorods

    Science.gov (United States)

    Zhu, Zhongqi; Zhang, Ke; Zhao, Heyun; Zhu, Jing

    2017-10-01

    Hexagonal CePO4 nanorods were synthesized via a simple hydrothermal method without the presence of surfactants and then characterized by powder X-ray diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy, scanning electron microscopy (SEM), transmission electron microscopy (TEM), ultraviolet-visible (UV-vis) absorption and photoluminescence (PL) spectroscopy. UV-light driven photocatalytic activities of hexagonal CePO4 nanorods were detailedly demonstrated via degrading different organic dyes such as congo red (CR), organic rhodamine B (RB), methyl orange (MO) and methylene blue (MB) since these nanorods exhibit strong UV absorption with the cutoff edge of about 420 nm.

  10. (H3O)Ca2Zn3.5(PO4)4 and Ba2Cd3(PO4)2(HPO4)2: Syntheses, crystal structures and characterizations of two mixed metal phosphates

    Science.gov (United States)

    Chang, Tong-Ying; Hu, Chun-Li; Yan, Dong; Mao, Jiang-Gao

    2017-07-01

    Two new phosphates, non-centrosymmetric (NCS) (H3O)Ca2Zn3.5(PO4)4 and centrosymmetric (CS) Ba2Cd3(PO4)2(HPO4)2 have been prepared by hydrothermal reactions. The single-crystal X-ray structural analyses have shown that they crystallized in space group P-421c and P21/c, respectively·(H3O)Ca2Zn3.5(PO4)4 features a three-dimensional (3D) network structure composed of ZnO4 and PO4 tetrahedra that are interconnected via corner-sharing, forming 1D channels of 6-MRs and 8-MRs which are filled by Ca2+ and H3O+ cations, respectively. Ba2Cd3(PO4)2(HPO4)2 features a layered [Cd3(PO4)2(HPO4)2]4- composed of 1D chain of edge-sharing CdO6 octahedra that are further bridged by PO4 tetrahedra with Ba2+ cations filling the interlayer spaces. Luminescent studies suggest that (H3O)Ca2Zn3.5(PO4)4 emits blue light. Optical diffuse reflectance spectra show the experimental band gaps for (H3O)Ca2Zn3.5(PO4)4 and Ba2Cd3(PO4)2(HPO4)2 are 5.67 eV and 5.68 eV, respectively. The UV cut-off edge of title compounds are around at 218 nm·(H3O)Ca2Zn3.5(PO4)4 exhibits a very weak SHG response.

  11. Variations of 210Po activity in mussel (Perna viridis) of Samut Sakhon and its contribution to dose assessment

    Science.gov (United States)

    Porntepkasemsan, B.; Srisuksawad, K.; Kulsawat, W.

    2015-05-01

    The activities of 210Po and its effective dose in green mussel (Perna viridis) collected from a mussel farming area in Samut Sakhon province during the period of 20122013 are presented. Several parameters including maximum shell length and the physiological performance of mussels using condition index and physical properties of seawater (pH, salinity, conductivity, TDS, DO and cation-anion elements) were measured. Each individual mussel was measured for its maximum shell length which was adopted as size class. The activity concentration of 210Po was determined spectroscopically through its 5.30 MeV alpha particle emission, using 209Po as an internal tracer. The 210Po activity concentration in mussels was found to vary between 1.044 and 6.951 Bq/kg wet weight. The 210Po concentration was higher in smaller-sized (≤35 mm) and lower in larger ones (40-70 mm). This confirmed that larger mussels have lower 210Po activities on a weight basis. The 210Po body burden (activity per mussel) ranged from 1.035 to 17.183 mBq. Contrary to the 210Po concentrations, results of the body burden revealed the lower activities in smaller-sized mussels (≤35 mm) and the higher in larger-sized ones (40-70 mm). The type of fluctuations observed with 210Po concentrations were interpreted as a seasonal effect. Total annual effective 210Po dose due to mussel consumption was calculated to be in the range of 3.081 to 16.401 pSv. Based on the international guideline, the average dose calculated due to 210Po in mussels of Samut Sakhon would not pose any significant radiological impact on human health and the mussels are considered to be safe for consumption.

  12. Synthesis of xLiMnPO4·yLi3V2(PO43/C Nanocomposites for Lithium Ion Batteries Using Tributyl Phosphate as Phosphor Source

    Directory of Open Access Journals (Sweden)

    Yanming Wang

    2017-01-01

    Full Text Available The xLiMnPO4·yLi3V2(PO43/C (x/y = 1 : 0, 12 : 1, 8 : 1, 6 : 1, 4 : 1, 0 : 1 composite cathode materials are synthesized using tributyl phosphate as a novel organic phosphor source via a solid-state reaction process. All obtained xLiMnPO4·yLi3V2(PO43/C composites present similar particles morphology with an average size of ca. 100 nm and low extent agglomeration. The electrochemical performance of pristine LiMnPO4/C can be effectively improved by adding small amounts of Li3V2(PO43 additives. The 4LiMnPO4·Li3V2(PO43/C has a high discharge capacity of 143 mAh g−1 at 0.1 C and keeps its 94% at the end of 100 cycles.

  13. Phase equilibria in the NaF-CdO-NaPO{sub 3} system at 873 K and crystal structure and physico-chemical characterizations of the new Na{sub 2}CdPO{sub 4}F fluorophosphate

    Energy Technology Data Exchange (ETDEWEB)

    Aboussatar, Mohamed [Université Clermont Auvergne, Université Blaise Pascal, Institut de Chimie de Clermont-Ferrand, UMR 6296 CNRS, BP 10448, F-63000 Clermont-Ferrand (France); Laboratoire de Physico-Chimie de l’État Solide, Faculté des Sciences de Sfax, Université de Sfax, BP 1171, 3000 Sfax (Tunisia); Mbarek, Aïcha [Laboratoire de Chimie Industrielle, Ecole Nationale d’Ingénieurs de Sfax, Université de Sfax, BP W3038, 3000 Sfax (Tunisia); Naili, Houcine [Laboratoire de Physico-Chimie de l’État Solide, Faculté des Sciences de Sfax, Université de Sfax, BP 1171, 3000 Sfax (Tunisia); El-Ghozzi, Malika [Université Clermont Auvergne, Université Blaise Pascal, Institut de Chimie de Clermont-Ferrand, UMR 6296 CNRS, BP 10448, F-63000 Clermont-Ferrand (France); Chadeyron, Geneviève [Université Clermont Auvergne, Institut de Chimie de Clermont-Ferrand, UMR 6296 CNRS/UBP/SIGMA, BP 10448, F-63000 Clermont-Ferrand (France); Avignant, Daniel [Université Clermont Auvergne, Université Blaise Pascal, Institut de Chimie de Clermont-Ferrand, UMR 6296 CNRS, BP 10448, F-63000 Clermont-Ferrand (France); Zambon, Daniel, E-mail: Daniel.Zambon@univ-bpclermont.fr [Université Clermont Auvergne, Université Blaise Pascal, Institut de Chimie de Clermont-Ferrand, UMR 6296 CNRS, BP 10448, F-63000 Clermont-Ferrand (France)

    2017-04-15

    Isothermal sections of the diagram representing phase relationships in the NaF-CdO-NaPO{sub 3} system have been investigated by solid state reactions and powder X-ray diffraction. This phase diagram investigation confirms the polymorphism of the NaCdPO{sub 4} side component and the structure of the ß high temperature polymorph (orthorhombic, space group Pnma and unit cell parameters a=9.3118(2), b=7.0459(1), c=5.1849(1) Å has been refined. A new fluorophosphate, Na{sub 2}CdPO{sub 4}F, has been discovered and its crystal structure determined and refined from powder X-ray diffraction data. It exhibits a new 3D structure with orthorhombic symmetry, space group Pnma and unit cell parameters a=5.3731(1), b=6.8530(1), c=12.2691(2) Å. The structure is closely related to those of the high temperature polymorph of the nacaphite Na{sub 2}CaPO{sub 4}F and the fluorosilicate Ca{sub 2}NaSiO{sub 4}F but differs essentially in the cationic repartition since the structure is fully ordered with one Na site (8d) and one Cd site (4c). Relationships with other Na{sub 2}M{sup II}PO{sub 4}F (M{sup II}=Mg, Ca, Mn, Fe, Co, Ni) have been examined and the crystal-chemical and topographical analysis of these fluorophosphates is briefly reviewed. IR, Raman, optical and {sup 19}F, {sup 23}Na, {sup 31}P MAS NMR characterizations of Na{sub 2}CdPO{sub 4}F have been investigated. - Graphical abstract: The structure of the compound Na{sub 2}CdPO{sub 4}F, discovered during the study of the phase relationships in the NaF-CdO-NaPO{sub 3} system, has been determined and compared with other Na{sub 2}M{sup II}PO{sub 4}F fluorophosphates. - Highlights: • XRD analysis of the isothermal section of the NaF-CdO-NaPO{sub 3} system at 923 K. • Rietveld refinement of the high temperature polymorph β-NaCdPO{sub 4}. • Crystal structure of the new Na{sub 2}CdPO{sub 4}F fluorophosphate determined from powder XRD. • Crystal structure - composition relationships of Na{sub 2}M{sup II}PO{sub 4}F compounds

  14. Enabling data analysis à la PROOF on the Italian ATLAS Tier2 using PoD

    CERN Document Server

    Di Nardo, R; The ATLAS collaboration; Vilucchi, E; Annovi, A; Antonelli, M; Carlino, G; De Salvo, A; Doria, A; Manafov, A; Martini, A; Testa, A

    2012-01-01

    We describe our experience using PROOF for data analysis on the Italian ATLAS-Tier2 in Frascati, Napoli and Roma1. To enable PROOF on the cluster we used PoD, Proof- on-Demand. PoD is a set of tools designed to interact with any resource management system (RMS) to start the PROOF daemons. In this way any user can quickly setup its own PROOF cluster on the resources, with the RMS taking care of scheduling, priorities and accounting. Usage of PoD has steadily increased in the last years, and the product has now reached a production level quality. PoD features an abstract interface to RMSs and provides several plugins for the most common RMSs. In our tests we used both the gLite and PBS plug-ins, the latter being the native RMS handling the resources under test. Data were accessed via xrootd, with file discovery provided by the standard ATLAS tools. The SRM is DPM (Disk Pool Manager) which has rfio as standard data access protocol; so we provided DPM of Xrootd protocol too. We will describe the configuration and...

  15. Na-doped LiMnPO4 as an electrode material for enhanced lithium ...

    Indian Academy of Sciences (India)

    Hybrid electric vehicles require lithium rechargeable batter- ies because of their excellent power density and long life time [1]. Cathode is the most important element within the lithium batteries, which gives significant impact on capacity and electrochemical performance. Lithium manganese phos- phate (LiMnPO4) is mainly ...

  16. Generalized moving boundary model for charge-discharge of LiFePO4/C cells

    Science.gov (United States)

    Khandelwal, Ashish; Hariharan, Krishnan S.; Senthil Kumar, V.; Gambhire, Priya; Kolake, Subramanya Mayya; Oh, Dukjin; Doo, Seokgwang

    2014-02-01

    Lithium ion cells with electrode materials that undergo phase transitions, like LiFePO4, have unique charge-discharge characteristics. In this work a generalized framework of moving boundary approach is proposed to model the path dependent charge-discharge response of porous electrodes that exhibit multi-phase coexistence. Using the Landau transformation the governing equation in moving coordinate is transformed to fixed coordinate and a suitable path dependent algorithm is devised and is implemented in a multi-physics environment. Simulation results show that tangential propagation of the phase front, often seen in experiments, can be addressed by this model. Incorporation of multi-phase diffusion predicts the characteristic phase separation in LiFePO4 particles. The proposed model successfully captures the charge-discharge asymmetry of LiFePO4 based cells. Efficacy of the proposed approach to model the path dependence of cells with phase change electrodes is demonstrated by simulating the response of LiFePO4/graphite cell subjected to a charge-discharge pulse. Numerical studies are performed to study the effect of important model parameters to enhance cell design and to bring out unique features in the cell response due to multi-phase coexistence.

  17. Charge carrier trapping processes in lanthanide doped La-, Gd-, Y-, and LuPO4

    NARCIS (Netherlands)

    Lyu, T.; Dorenbos, P.

    2017-01-01

    Various methods for deliberate design electron and hole trapping materials are explored with a study on double lanthanide doped rare earth ortho phosphates. Cerium acts as recombination center while lanthanide codopants as electron trapping centers in LaPO4:0.005Ce3+,0.005Ln3+. The electron trap

  18. Types d'êtres discursifs dans la ScaPoLine

    DEFF Research Database (Denmark)

    Nølke, Henning

    2009-01-01

    Artiklen præsenterer en teoretisk og empirisk undersøgelse af diskursindividdernes  (DI) natur i et forsøg på bedre at forstå hvilken rolle de spiller i den konkrete tolkning af teksters polyfoni. DI er et centralt element i Den Skandinaviske Polyfoniteori (ScaPoLine). Først introduceres den gene...

  19. High-performance carbon-LiMnPO{sub 4} nanocomposite cathode for lithium batteries

    Energy Technology Data Exchange (ETDEWEB)

    Oh, Seung-Min; Oh, Sung-Woo; Sun, Yang-Kook [Department of WCU Energy Engineering, Department of Chemical Engineering, Hanyang University, Seoul (Korea); Yoon, Chong-Seung [Department of Materials Science and Engineering, Hanyang University, Seoul (Korea); Scrosati, Bruno [Department of Chemistry, University of Rome ' ' La Sapienza (Italy); Amine, Khalil [Electrochemical Technology Program, Chemical Sciences and Engineering Division, Argonne National Laboratory, Argonne, IL (United States)

    2010-10-08

    A cathode material of an electrically conducting carbon-LiMnPO{sub 4} nanocomposite is synthesized by ultrasonic spray pyrolysis followed by ball milling. The effect of the carbon content on the physicochemical and electrochemical properties of this material is extensively studied. A LiMnPO{sub 4} electrode with 30 wt% acetylene black (AB) carbon exhibits an excellent rate capability and good cycle life in cell tests at 55 and 25 C. This electrode delivers a discharge capacity of 158 mAh g{sup -1} at 1/20 C, 126 mAh g{sup -1} at 1 C, and 107 mAh g{sup -1} at 2 C rate, which are the highest capacities reported so far for this type of electrode. Transmission electron microscopy and Mn dissolution results confirm that the carbon particles surrounding the LiMnPO{sub 4} protect the electrode from HF attack, and thus lead to a reduction of the Mn dissolution that usually occurs with this electrode. The improved electrochemical properties of the C-LiMnPO{sub 4} electrode are also verified by electrochemical impedance spectroscopy. (Abstract Copyright [2010], Wiley Periodicals, Inc.)

  20. The effects of the PoPI act on small and medium enterprises in South Africa

    CSIR Research Space (South Africa)

    Botha, JG

    2015-08-01

    Full Text Available and also acknowledges the need for businesses to collect and use personal information. Having this type of legislation in place is without a doubt very beneficial to most individuals. However, the effects that the PoPI Act will have on South African small...

  1. Oslo, Norway, Kilimanjaro Christian Medical Centre, P.O Box 3010 ...

    African Journals Online (AJOL)

    2002-01-01

    Jan 1, 2002 ... Oslo, Norway, Kilimanjaro Christian Medical Centre, P.O Box 3010, Moshi, Tanzania, E. Mbizvo, MD MPH, Department of International Health, .... "whiff test". All other specimens were processed in the clinical laboratory at K.C.M.C referral hospital. Within five hours of sampling, the high vaginal swabs were.

  2. Cuban heritage in Africa: Deported Ñáñigos to Fernando Po in the ...

    African Journals Online (AJOL)

    This paper focuses on the 19th century deportation of Ñáñigos (members of Abakuá, a Cuban secret society) to Fernando Po (Bioko). I argue against the widely held negative image of this group as portrayed in the news and press information in Spanish newspapers from 1865 to 1950 that document the Cuban heritage in ...

  3. Health Sciences, Moi University, P.O. Box 6121, Eldoret, Kenya, E ...

    African Journals Online (AJOL)

    2007-07-07

    Jul 7, 2007 ... of Immunisation, Department of Preventive and Promotive Health Care, P.O. Box 43319, Nairobi, Kenya and F.O. Esamai,. MBChB, MMed ... Main outcome measures: Number of staff trained on EPI, coverage rates and perceived training needs of the ... being measles, Haemophilus influenza B, pertussis.

  4. Increase of {sup 210}Po levels in human semen fluid after mussel ingestion

    Energy Technology Data Exchange (ETDEWEB)

    Kelecom, Alphonse, E-mail: lararapls@hotmail.co [Laboratory of Radiobiology and Radiometry-LARARA-PLS, Universidade Federal Fluminense, P.O.Box 100.436, 24001-970 Niteroi, RJ (Brazil); Programs in Environmental Science and Marine Biology, Universidade Federal Fluminense, Niteroi, RJ (Brazil); Gouvea, Rita de Cassia dos Santos [Laboratory of Radiobiology and Radiometry-LARARA-PLS, Universidade Federal Fluminense, P.O.Box 100.436, 24001-970 Niteroi, RJ (Brazil)

    2011-05-15

    Polonium-210 ({sup 210}Po) radioactive concentrations were determined in human semen fluid of vasectomized non-smoker volunteers. The {sup 210}Po levels ranged from 0.10 to 0.39 mBq g{sup -1} (mean: 0.23 {+-} 0.08 mBq g{sup -1}). This value decreased to 0.10 {+-} 0.02 mBq g{sup -1} (range from 0.07 to 0.13 mBq g{sup -1}) after two weeks of a controlled diet, excluding fish and seafood. Then, volunteers ate during a single meal 200 g of the cooked mussel Perna perna L., and {sup 210}Po levels were determined again, during ten days, in semen fluid samples collected every morning. Volunteers continued with the controlled diet and maintained sexual abstinence through the period of the experiment. A 300% increase of {sup 210}Po level was observed the day following mussel consumption, with a later reduction, such that the level returned to near baseline by day 4.

  5. The Aalborg University PO-PBL Model from a Socio-cultural Learning Perspective

    DEFF Research Database (Denmark)

    Hernández, Carola Hernández; Ravn, Ole; Valero, Paola

    2015-01-01

    of learning. One of the theoretical frameworks underpinning the understanding of learning is the socio-cultural perspective. This paper aims at exploring and analyzing the PO-PBL model from this theoretical perspective. In addition, this reading may also open a new viewpoint in science teaching for other...

  6. Negative thermal expansion properties in tetragonal NbPO5 from the first principles studies

    Directory of Open Access Journals (Sweden)

    Tao Li

    2017-03-01

    Full Text Available By using the first-principles calculations based on density functional theory combined with quasi-harmonic approximation, we have studied the geometric structural, thermal properties, and the negative thermal expansion (NTE properties of tetrahedral NbPO5. The variations of cell parameter and cell volume of tetrahedral NbPO5 with temperature show that it displays NTE behavior in the range of 473-800 K along a-axis and the corresponding average coefficient of thermal expansion (CTE is approximately -0.766 ×10−6 K−1, while the c cell parameter and the cell volume display positive thermal expansion behaviors. These results are in consistent well with the experiment observations. Further vibrational modes analysis, together with Grüneisen parameters calculations, revealed that the transverse vibration of O corner atoms accompanying the rocking motions of corner-shared NbO6 octahedron and PO4 tetrahedron dominate the negative thermal properties of tetrahedral NbPO5. Our findings will provide an understanding for the underlying mechanisms of the NTE in oxides materials.

  7. Luminescence properties of terbium-doped Li3PO4 phosphor for ...

    Indian Academy of Sciences (India)

    The powder X-ray diffraction (PXRD), photoluminescence (PL) emission and excitation spectra, thermoluminescence (TL) and optically stimulated luminescence (OSL) were measured. The particle size was calculated using the Debye Scherrer formula and found to be 79.42 nm. PL emission spectra of Li 3 PO 4 :Tb 3 + ...

  8. Improved photocatalytic degradation of organic dye using Ag3PO4/MoS2 nanocomposite

    Science.gov (United States)

    Sharma, Madhulika; Mohapatra, Pranab Kishore; Bahadur, Dhirendra

    2017-12-01

    Highly efficient Ag3PO4/MoS2 nanocomposite photocatalyst was synthesized using a wet chemical route with a low weight percentage of highly exfoliated MoS2 (0.1 wt.%) and monodispersed Ag3PO4 nanoparticles ( 5.4 nm). The structural and optical properties of the nanocomposite were studied using various characterization techniques, such as XRD, TEM, Raman and absorption spectroscopy. The composite exhibits markedly enhanced photocatalytic activity with a low lamp power (60 W). Using this composite, a high kinetic rate constant ( k) value of 0.244 min-1 was found. It was observed that 97.6% of dye degrade over the surface of nanocomposite catalyst within 15 min of illumination. The improved photocatalytic activity of Ag3PO4/MoS2 nanocomposite is attributed to the efficient interfacial charge separation, which was supported by the PL results. Large surface area of MoS2 nanosheets incorporated with well dispersed Ag3PO4 nanoparticles further increases charge separation, contributing to enhanced degradation efficiency. A possible mechanism for charge separation is also discussed.

  9. MW-assisted synthesis of LiFePO{sub 4} for high power applications

    Energy Technology Data Exchange (ETDEWEB)

    Beninati, Sabina; Damen, Libero; Mastragostino, Marina [University of Bologna, Department of Metal Science, Electrochemistry and Chemical Techniques, Via San Donato 15, 40127 Bologna (Italy)

    2008-06-01

    LiFePO{sub 4}/C was prepared by solid-state reaction from Li{sub 3}PO{sub 4}, Fe{sub 3}(PO{sub 4}){sub 2}.8H{sub 2}O, carbon and glucose in a few minutes in a scientific MW (microwave) oven with temperature and power control. The material was characterized by X-ray diffraction, scanning electron microscopy and by TGA analysis to evaluate carbon content. The electrochemical characterization as positive electrode in EC (ethylene carbonate)-DMC (dimethylcarbonate) 1 M LiPF{sub 6} was performed by galvanostatic charge-discharge cycles at C/10 to evaluate specific capacity and by sequences of 10 s discharge-charge pulses, at different high C-rates (5-45C) to evaluate pulse-specific power in simulate operative conditions for full-HEV application. The maximum pulse-specific power and, particularly, pulse efficiency values are quite high and make MW synthesis a very promising route for mass production of LiFePO{sub 4}/C for full-HEV batteries at low energy costs. (author)

  10. Environmentally benign novel green pigments: Pr1–xCaxPO4 (x = 0 ...

    Indian Academy of Sciences (India)

    Unknown

    Environmentally benign novel green pigments: Pr1–xCaxPO4 (x = 0–0⋅4). V SIVAKUMAR and U V VARADARAJU*. Materials Science Research Centre and Department of Chemistry, Indian Institute of Technology Madras, Chennai 600 036,. India. MS received 31 March 2005. Abstract. Rare earth based materials have ...

  11. Specifika architektury hronovsko-poříčského zlomu

    Czech Academy of Sciences Publication Activity Database

    Prouza, V.; Coubal, Miroslav; Adamovič, Jiří

    2015-01-01

    Roč. 2014, č. 1 (2015), s. 13-18 ISSN 0514-8057 Institutional support: RVO:67985831 Keywords : fault architecture * fault core * damage zone * drag zone * Hronov-Poříčí Fault Subject RIV: DB - Geology ; Mineralogy

  12. Three-dimensional seismo-tectonics in the Po Valley basin, Northern Italy

    NARCIS (Netherlands)

    Turrini, Claudio; Angeloni, Pamela; Lacombe, Olivier; Ponton, Maurizio; Roure, François

    2015-01-01

    The Po Valley (Northern Italy) is a composite foreland-foredeep basin caught in between the Southern Alps and Northern Apennine mountain belts. By integrating the 3D structural model of the region with the public earthquake dataset, the seismo-tectonics of the basin is shown at different scales of

  13. CdZnTe Background Measurements at Balloon Altitudes with PoRTIA

    Science.gov (United States)

    Parsons, A.; Barthelmy, S.; Bartlett, L.; Gehrels, N.; Naya, J.; Stahle, C. M.; Tueller, J.; Teegarden, B.

    2003-01-01

    Measurements of the CdZnTe internal background at balloon altitudes are essential to determine which physical processes make the most important background contributions. We present results from CdZnTe background measurements made by PoRTIA, a small CdZnTe balloon instrument that was flown three times in three different shielding configurations. PoRTIA was passively shielded during its first flight from Palestine, Texas and actively shielded as a piggyback instrument on the GRIS balloon experiment during its second and third flights from Alice Springs, Australia, using the thick GRIS Nal anticoincidence shield. A significant CdZnTe background reduction was achieved during the third flight with PoRTIA placed completely inside the GRIS shield and blocking crystal, and thus completely surrounded by 15 cm of Nal. A unique balloon altitude background data set is provided by CdZnTe and Ge detectors simultaneously surrounded by the same thick anticoincidence shield; the presence of a single coxial Ge detector inside the shield next to PoRTIA allowed a measurement of the ambient neutron flux inside the shield throughout the flight. These neutrons interact with the detector material to produce isomeric states of the Cd, Zn and Te nuclei that radiatively decay; calculations are presented that indicate that these decays may explain most of the fully shielded CdZnTe background.

  14. Função Poética e Televisão

    Directory of Open Access Journals (Sweden)

    Anna Maria Balogh

    1990-10-01

    Full Text Available Ao empreendermos uma rápida usca nos guardados da memória, verificamos a existência de conceitos arraigados no tocante ao que se considera artístico". Alguns dos conceitos de "artisticidade" revelam vinculações estreitas com as funções "estética" e "poética".

  15. Hair and feathers as indicator of internal contamination of 210Po and 210Pb

    Energy Technology Data Exchange (ETDEWEB)

    Holm, E. (ed.); Gwynn, J.; Zaborska, A.; Gaefvert, T. (Norwegian Radiation Protection Authority (Norway)); Roos, P. (Technical Univ. of Denmark, Risoe National Lab. for Sustainable Energy, Roskilde (Denmark)); Henricsson, F. (Lund Univ., Lund (Sweden))

    2010-03-15

    The activities of the NKS-B HAIRPOL project is summarised in this report. The objective was to investigate if hair and feathers were suitable matrices for the estimation of the intake of 210Po. Human hair from people of different sex and age was analysed for 210Po showing concentrations between 0.4 to 11 Bq/kg dry weight. Samples from horses, mane, fur and tail showed concentration from 6 to 17 Bq/kg with no significant difference between the different sample types. Musk ox from Greenland showed much higher concentrations since the animal has to graze a large surface. In fur the concentration was 260 Bq/kg. A considerable fraction of the total 210Po in this animal is contained in the hair. Also different organs were analysed and the highest concentration was found in kidney, 2 700 Bq/kg. The 210Pb concentration in hair was estimated to about 20 Bq/kg. Three different seabirds from Svalbard were analysed. Feathers from all three seabird species show increasing activity concentrations of 210Po and 210Pb from the base to the tip of the feather, but it was difficult to relate feather concentrations to muscle concentrations due to a number of complicating factors. (author)

  16. Proton-conducting solid acid electrolytes based upon MH(PO3H)

    NARCIS (Netherlands)

    Zhou, W.

    2011-01-01

    Solid acids, such as CsHSO4 and CsH2PO4, are a novel class of anhydrous proton-conducting compounds that can be used as electrolyte in H2/O2 and direct methanol fuel cells. The disordering of the hydrogen-bonded network above the so-called superprotonic phase transition results in an increase of the

  17. Attracting applicants on the web: PO fit, industry culture stereotypes, and website design

    NARCIS (Netherlands)

    de Goede, M.E.E.; van Vianen, A.E.M.; Klehe, U.-C.

    2011-01-01

    This study tested the extent to which industry culture stereotypes influence job-seekers' Person-Organization fit when job-seekers inspect organizations' websites. We proposed that PO fit would relate to Person-Industry (PI) fit, which is the fit between personal values and industry culture

  18. Present-day 3D structural model of the Po Valley basin, Northern Italy

    NARCIS (Netherlands)

    Turrini, C.; Lacombe, O.; Roure, F.

    2014-01-01

    A 3D structural model of the Po Valley basin (Northern Italy) was built by integrating the dataset available from the public domain (DEM, wells, isobath-maps, cross-sections, outcrop-trends).The model shows the complex foredeep-foreland architecture across the basin, from the Moho level to the

  19. The Aalborg University PO-PBL Model from a Socio-Cultural Learning Perspective

    Science.gov (United States)

    Hernandez, Carola; Ravn, Ole; Valero, Paola

    2015-01-01

    Since the 1970s, Aalborg University has been developing a new pedagogical model in higher education: The Project Oriented-Problem Based Learning (PO-PBL). In particular, the Faculty of Engineering and Science has developed a pedagogical proposal that introduces students to a different type of learning. One of the theoretical frameworks…

  20. AHP 28: The Cham's First Highland Sovereign: Po Romé (r. 1627-1651

    Directory of Open Access Journals (Sweden)

    William Noseworthy

    2013-12-01

    Full Text Available From 1627 to 1651, a member of the highland Austronesian Churu peoples, Po Romé, ruled over the lowland Austronesian Cham peoples' kingdom of Panduranga (now Khánh Hòa, Bình Thuận, and Ninh Thuận provinces in Việt Nam. Po Romé has been referred to as the 'Charlemagne' of Cham studies (Bruckmayr, 2013, indicative of his importance in larger understandings of the Cham and their role in Southeast Asian history. The Cham have generally been understood as a lowland people who brought highland peoples into their cultural sphere through conquest and trade. Scott (2009 has recently critiqued such simplistic presentations of the 'civilizing' of the highlands, and argued for a more nuanced understanding of highland identity. However, one conspicuous absence in Scott's portrayal is an examination of highland-lowland relations through the biographies of figures such as Po Romé. I argue that an examination of Po Romé's life and its ethnographic and historiographic contexts deepens our understanding of upland peoples and Cham history.

  1. Field-induced reentrant magnetoelectric phase in LiNiPO4

    DEFF Research Database (Denmark)

    Toft-Petersen, Rasmus; Fogh, Ellen; Kihara, Takumi

    2017-01-01

    Using pulsed magnetic fields up to 30 T we have measured the bulk magnetization and electrical polarization of LiNiPO4 and have studied its magnetic structure by time-of-flight neutron Laue diffraction. Our data establish the existence of a reentrant magnetoelectric phase between 19 T and 21 T. W...

  2. Conversion of alcohols ({alpha}-methylated series) on AlPO{sub 4} catalysts

    Energy Technology Data Exchange (ETDEWEB)

    Campelo, J.M.; Garcia, A.; Herencia, J.F. [Universidad de Cordoba (Spain)] [and others

    1995-02-01

    The conversion (dehydration/dehydrogenation) of alcohols in {alpha}-methylated series (methanol, ethanol, 2-propanol, and tert-butanol) on AlPO{sub 4} catalysts differently prepared has been studied by microcatalytic pulse reactor technique at different temperatures and flow rates. The kinetic parameters have been obtained by analysis of the data through the Bassett-Habgood equation. Dehydration to ether and/or olefin is the major reaction process. Dehydrogenation product was only scarcely found in 2-propanol conversion. The influence of the reaction temperature upon the conversion of alcohols and the selectivities of the products was investigated. Activity increases as a function of surface acidity of the AlPO{sub 4} catalyst as well as with the {alpha}-substitution in the alcohol. Moreover, selectivity studies indicated that ethanol and 2-propanol dehydration follows a combination pathway of parallel and consecutive reactions. A good correlation between the results of dehydration conversion and acid properties, gas-chromatographically measured through the irreversible adsorption of pyridine (473 and 573 K) and 2,6-dimethylpyridine (573 K), is observed. Also, activity poisoning results indicated that Broensted acid sites of AlPO{sub 4} catalyst participated in dehydradation processes, thus strengthening the carbenium ion reaction pathway in AlPO{sub 4} catalysts. 49 refs., 3 figs., 4 tabs.

  3. DR. ADR PoLMAN, NeJer/andscAe Ge/oo/s&e

    African Journals Online (AJOL)

    Test

    seer, is die herlewing van de gedagtewisseling tussen Rome en die. Protestante. In 'n breë en uitvoerige inleiding van 95 bladsye gee Dr. PoLMAN sy opvatting oor die wese en waarde van belydenisskrifte. Hierdie oorsig probeer histories goed gefundeer te wees, en het 'n uitvoerige litteratuuropgawe; dit is 'n inleiding wat ...

  4. Structural investigations of (La,Pu)PO4 monazite solid solutions: XRD and XAFS study

    Science.gov (United States)

    Arinicheva, Yulia; Popa, Karin; Scheinost, Andreas C.; Rossberg, André; Dieste-Blanco, Oliver; Raison, Philippe; Cambriani, Andrea; Somers, Joseph; Bosbach, Dirk; Neumeier, Stefan

    2017-09-01

    A solid state method was used to synthesize La1-xPuxPO4 (x = 0.01, 0.05, 0.10, 0.15, (0.5)) solid solutions with monazite structure. XRD measurements of the compounds with x = 0.50 revealed the formation of two phases: (La,Pu)PO4-monazite and a cubic phase (PuO2). Pure-phase La1-xPuxPO4-monazite solid solutions were obtained for materials with x = 0.00-0.15 and confirmed by a linear dependence of the lattice parameters on composition according to Vegard's law. X-ray absorption spectroscopy (XAS) analysis at the Pu-LIII and La-LIII edges confirmed the +III valence state of plutonium in the monazite solid solutions. The local environment of Pu is PuPO4-like along the solid solution series, except for the longest fitted cation-cation distance, which may be an indication of cluster formation consisting of a few Pu-atoms in the La-Pu-monazite lattice.

  5. Revisiting the electrochemical impedance behaviour of the LiFePO ...

    Indian Academy of Sciences (India)

    http://www.ias.ac.in/article/fulltext/jcsc/125/03/0687-0693. Keywords. Lithium ion battery; impedance spectroscopy; electrochemistry; lithium iron phosphate. Abstract. In the present work, the electrochemical behaviour of LiFePO4/C electrode has been reported. Specially, the electrochemical impedance spectroscopies (EIS) ...

  6. Linking the Fits, Fitting the Links: Connecting Different Types of PO Fit to Attitudinal Outcomes

    Science.gov (United States)

    Leung, Aegean; Chaturvedi, Sankalp

    2011-01-01

    In this paper we explore the linkages among various types of person-organization (PO) fit and their effects on employee attitudinal outcomes. We propose and test a conceptual model which links various types of fits--objective fit, perceived fit and subjective fit--in a hierarchical order of cognitive information processing and relate them to…

  7. Deported Ñáñigos to Fernando Po in the 19th century.

    African Journals Online (AJOL)

    the society, the punishment is carried out at the drum (Aranzadi, 2009:174) in Malabo as well as in Cuba (Trujillo and Monagas 1882:366). In the colonial period, at Epiphany the Governor used to give the “aguinaldo” (Christmas bonus) to the association in Havana (1882:365) as he did in Fernando Po. At Christmas many.

  8. Po'ouli landscape bioinformatics models predict energetics, behavior, diets, and distribution on Maui.

    Science.gov (United States)

    Porter, W P; Vakharia, N; Klousie, W D; Duffy, D

    2006-12-01

    This study uses a spatially explicit microclimate/biophysical approach to examine the potential distribution of the Po'ouli on Maui to find either new habitats to search for existence or refine search efforts in previously occupied areas. We used specific physiological and behavioral ecology bird data, and Po'ouli morphological and spectral data obtained from museum specimens to address ecological and conservation-related questions about the Po'ouli that are otherwise very difficult to quantify. Laboratory and field tested microclimate and biophysical-behavioral animal computer models were integrated with remote sensing technologies. To show that the generic microclimate and endotherm models can predict metabolic and water loss requirements of Hawaiian Honeycreepers, we used the 2 species with known physiological properties, the Hawaiian Amakihi, Hemignathus virens, and the Hawaiian Anianiau, Hemignathus parvus. Predictions were within experimental measurement error of the laboratory measurements. Then using field rather than laboratory conditions as input data, we predict the field distribution of the Amakihi on Maui as the first spatial test of the models applied to birds. Results are consistent with Amakihi field distribution data. Fossils show that the Po'ouli once lived on Maui at low elevations in dry/mesic habitats on a likely diet of native tree snails and insects. The arrival of lethal mosquito-borne avian malaria in Hawaii exterminated low elevation Po'ouli forcing a population shift to mountain rainforests and possibly a snail diet instead of insects. To explore the maximum consequences of such a diet shift we assumed exclusive diets of snails versus insects at both low and high elevations. Snail diets require ∼4 times higher foraging rates than do insect diets, making a predominantly snail diet an unlikely prospect for the Po'ouli. Landscape scale simulations suggest that a snail diet would force a Po'ouli distribution inconsistent with observations

  9. Effect of Glucose on Structure and Properties of LiFePO4 Cathode Material Prepared by Microwave Hydrothermal Method

    Directory of Open Access Journals (Sweden)

    XIA Ao

    2016-10-01

    Full Text Available Orthorhombic LiFePO4/C composite material with olivine structure was prepared by microwave hydrothermal method using FeSO4·7H2O, LiOH·H2O and H3PO4 as raw materials, with glucose as carbon source and modifier. The influence of glucose on the composition, structure, morphology and electrochemical performance of LiFePO4 was investigated by means of XRD, SEM, EDS and constant current charge-discharge cycling. The results show that the as-obtained LiFePO4/C exhibits stronger bonding among Fe, P and O atoms, finer particle size and improved electrochemical properties than the pristine LiFePO4. From the SEM image, the LiFePO4 is coated by carbon in the LiFePO4/C composite. The LiFePO4/C shows the initial discharge capacity of 125.6mAh/g at 0.1C. Even at a rate of 1.0C, it still can deliver a discharge capacity of 106.2mAh/g, the capacity retention is 91.3% after 30 cycles.

  10. The Polysemy of an "Empty" Prefix: A Corpus-Based Cognitive Semantic Analysis of the Russian Verbal Prefix po-

    Science.gov (United States)

    LeBlanc, Nicholas Lance

    2010-01-01

    This dissertation proposes a structured semantic account of the polysemous Russian verbal prefix "po-" within the theoretical framework of cognitive linguistics and using corpus linguistic methods. While scholarly consensus identifies five meanings for "po-" and an additional meaning in conjunction with the suffix--"yva"--, the relationships among…

  11. Synthesis of BiPO4/Bi2S3 Heterojunction with Enhanced Photocatalytic Activity under Visible-Light Irradiation

    National Research Council Canada - National Science Library

    Lu, Mengna; Yuan, Guotao; Wang, Zuoshan; Wang, Yuyuan; Guo, Jun

    2015-01-01

    BiPO4/Bi2S3 photocatalysts were successfully synthesized by a simple two-step hydrothermal process, which involved the initial formation of BiPO4 rod and then the attachment of Bi2S3 through ion exchange...

  12. Applications of PB-210/RA-226 and PO-210/PB-210 disequilibria in the study of marine geochemical processes

    Energy Technology Data Exchange (ETDEWEB)

    Bacon, M. P.

    1976-02-01

    The distribution of /sup 210/Pb and /sup 210/Po in dissolved (less than 0.4 micron) and particulate (greater than 0.4 micron) phases was measured at ten stations in the tropical and eastern North Atlantic and at two stations in the Pacific. Both radionuclides occur principally in the dissolved phase. Unsupported /sup 210/Pb activities, maintained by flux from the atmosphere, were present in the surface mixed layer and penetrated into the thermocline to depths of about 500 m. Dissolved /sup 210/Po was ordinarily present in the mixed layer at less than equilibrium concentrations, suggesting rapid biological removal of this nuclide. Particulate matter was enriched in /sup 210/Po, with /sup 210/Po//sup 210/Pb activity ratios greater than 1.0, similar to those reported for phytoplankton. Box-model calculations yield a 2-y residence time for /sup 210/Pb and a 0.6-y residence time for /sup 210/Po in the mixed layer. These residence times are considerably longer than the time calculated for turnover of particles in the mixed layer (about 0.1 y). At depths of 100 to 300 m, /sup 210/Po maxima occurred and unsupported /sup 210/Po was frequently present. Calculations indicate that at least 50 percent of the /sup 210/Po removed from the mixed layer is re-cycled within the thermocline. Similar calculations for /sup 210/Pb suggest much lower re-cycling efficiencies.

  13. Numerical Model and Analysis of Peak Temperature Reduction in LiFePO4 Battery Packs Using Phase Change Materials

    DEFF Research Database (Denmark)

    Coman, Paul Tiberiu; Veje, Christian

    2013-01-01

    Numerical model and analysis of peak temperature reduction in LiFePO4 battery packs using phase change materials......Numerical model and analysis of peak temperature reduction in LiFePO4 battery packs using phase change materials...

  14. Preparation and photocatalytic degradation performance of Ag{sub 3}PO{sub 4} with a two-step approach

    Energy Technology Data Exchange (ETDEWEB)

    Li, Jiwen; Ji, Xiaojing; Li, Xian; Hu, Xianghua; Sun, Yanfang; Ma, Jingjun, E-mail: mjjwjpmartin@sina.com; Qiao, Gaowei

    2016-05-30

    Highlights: • Ag{sub 3}PO{sub 4} photocatalysts were synthesized via one-step and two-step ion-exchange reaction. • Photocatalytic properties of Ag{sub 3}PO{sub 4} photocatalysts was investigated, the result indicated the Ag{sub 3}PO{sub 4} (2) was higher than that of Ag{sub 3}PO{sub 4} (1) under the same experimental condition. • Ag{sub 3}PO{sub 4} (2) particles were larger than Ag{sub 3}PO{sub 4} (1) particles and many polygonal-shaped surfaces could be clearly observed in the Ag{sub 3}PO{sub 4} (2) particles. - Abstract: Ag{sub 3}PO{sub 4} photocatalysts were prepared via two and one-step through a facile ion-exchange route. The photocatalysts were then characterized through powder X-ray diffraction, scanning electron microscopy and UV–vis diffuse reflectance spectroscopy. The photocatalytic activity of the samples was evaluated on the basis of the photocatalytic degradation of methyl orange (MO) and methylene blue (MB) under solar irradiation. The MO degradation rate of the Photocatalyst synthesized by the two-step ion-exchange route was 89.18% in 60 min. This value was four times that of the Photocatalyst synthesized by the one-step approach.The MB degradation rate was 97% in 40 min. After six cycling runs were completed, the MO degradation rate was 73%.

  15. Negative regulation of prophenoloxidase (proPO) activation by a clip-domain serine proteinase homolog (SPH) from endoparasitoid venom.

    Science.gov (United States)

    Zhang, Guangmei; Lu, Zhi-Qiang; Jiang, Haobo; Asgari, Sassan

    2004-05-01

    Most parasitic wasps inject maternal factors into the host hemocoel to suppress the host immune system and ensure successful development of their progeny. Melanization is one of the insect defence mechanisms against intruding pathogens or parasites. We previously isolated from the venom of Cotesia rubecula a 50 kDa protein that blocked melanization in the hemolymph of its host, Pieris rapae [Insect Biochem. Mol. Biol. 33 (2003) 1017]. This protein, designated Vn50, is a serine proteinase homolog (SPH) containing an amino-terminal clip domain. In this work, we demonstrated that recombinant Vn50 bound P. rapae hemolymph components that were recognized by antisera to Tenebrio molitor prophenoloxidase (proPO) and Manduca sexta proPO-activating proteinase (PAP). Vn50 is stable in the host hemolymph-it remained intact for at least 72 h after parasitization. Using M. sexta as a model system, we found that Vn50 efficiently down-regulated proPO activation mediated by M. sexta PAP-1, SPH-1, and SPH-2. Vn50 did not inhibit active phenoloxidase (PO) or PAP-1, but it significantly reduced the proteolysis of proPO. If recombinant Vn50 binds P. rapae proPO and PAP (as suggested by the antibody reactions), it is likely that the molecular interactions among M. sexta proPO, PAP-1, and SPHs were impaired by this venom protein. A similar strategy might be employed by C. rubecula to negatively impact the proPO activation reaction in its natural host.

  16. Skin-fold thickness, body mass, and obesity indexes and the arterial to skin-surface PO2 gradient.

    Science.gov (United States)

    Rafferty, T D; Morrero, O

    1983-10-01

    Trends in transcutaneous oxygen tension (tcPO2) correlate closely with Pao2 in the absence of circulatory insufficiency. Individual variation, however, in the arterial to skin-surface Po2 gradient (Pao2-tcPo2 gradient) have limited the usefulness of tcPo2 measurements as precise indicators of Pao2. This individual variability in the Pao2-tcPo2 gradient has been speculated as being caused by "skin factors." This study was performed to examine the relationship between skin-fold thickness (triceps and infraclavicular), body mass index, body surface area, and ponderal index and the Pao2-tcPo2 gradient with a view to delineating correction factors that might be useful in increasing the accuracy of tcPo2 as an estimate of the absolute value of the corresponding Pao2. Skin-fold thickness measurements, body mass index, body surface area, and ponderal index were unrelated to the Po2 gradient. This was thought to be primarily due to an inherent inaccuracy of these measurements as indicators of stratum corneum thickness and dermal capillary depth, the major involved variables.

  17. Structural and spectroscopic properties of pure and doped LiCe(PO{sub 3}){sub 4}

    Energy Technology Data Exchange (ETDEWEB)

    Abdelhedi, M., E-mail: m_abdelhedi2002@yahoo.fr [Laboratoire de Chimie Inorganique, Université de Sfax, Faculté des Sciences de Sfax, BP 1171, 3000 Sfax (Tunisia); Horchani-Naifer, K. [Laboratoire de Physico-chimie des Matériaux Minéraux et leurs Applications, Centre National des Recherches en Sciences des Matériaux, Technopole de Borj Cedria, 6 BP 73, 8027 Soliman (Tunisia); Dammak, M. [Laboratoire de Chimie Inorganique, Université de Sfax, Faculté des Sciences de Sfax, BP 1171, 3000 Sfax (Tunisia); Ferid, M. [Laboratoire de Physico-chimie des Matériaux Minéraux et leurs Applications, Centre National des Recherches en Sciences des Matériaux, Technopole de Borj Cedria, 6 BP 73, 8027 Soliman (Tunisia)

    2015-10-15

    Graphical abstract: Emission and excitation and spectra of Eu{sup 3+} doped LiCe(PO{sub 3}){sub 4} host lattice with 1, 2, 3 and 4 mol%. - Highlights: • Europium–doped LiCe(PO{sub 3}){sub 4} were prepared by flux method. • It was analyzed by infrared and Raman spectroscopy, and luminescence spectroscopy. • LiCe(PO{sub 3}){sub 4} doped with Eu{sup 3+} ions as luminophore host materials to produce an intense red. - Abstract: Single crystals of LiCe(PO{sub 3}){sub 4} polyphosphate have been synthesized by the flux method and its structural and luminescence properties have been investigated. This compound crystallizes in the space group C2/c with unit cell dimensions a = 16.52(7) Å, b = 7.09(4) Å, c = 9.83 (4)Å, β = 126.29(4)°, Z = 8 and V = 927.84(3) Å{sup 3}. The obtained polytetraphosphate exhibits very small crystals and the dopant Eu{sup 3+} ions were successfully incorporated into the sites of Ce{sup 3+} ions of the host lattice. The spectroscopy properties confirm the potentiality of present LiCe(PO{sub 3}){sub 4} doped with Eu{sup 3+} ions as luminophore host materials to produce an intense red luminescence at 628 nm corresponding to {sup 5}D{sub 0} → {sup 7}F{sub 2} emission level and have significant importance in the development of emission optical systems.

  18. 137Cs and 210Po in Pacific Walrus and Bearded Seal from St. Lawrence Island, Alaska

    Energy Technology Data Exchange (ETDEWEB)

    Hamilton, T F; Seagars, D J; Jokela, T; Layton, D

    2005-02-02

    The activity concentration of Cesium-137 ({sup 137}Cs) and naturally-occurring Polonium-210 ({sup 210}Po) were measured in the muscle tissue, kidney and liver of Pacific walrus (Odobenus rosmarus divergens) and bearded seal (Erignathus barbatus) collected by native hunters from the Bering Sea. The mean {sup 137}Cs concentrations in muscle, liver and kidney of Pacific walrus were 0.07, 0.09 and 0.07 Bq kg{sup -1} (N= 5, wet weight), respectively, and 0.17, 0.10, and 0.17 Bq kg{sup -1} (N=2, wet weight), respectively, in bearded seal. In general, {sup 137}Cs tissue concentrations are significantly lower than those previously reported for mammals from other regions. By comparison, {sup 210}Po activity concentrations appear to be higher than those reported elsewhere but a larger variation. The mean {sup 210}Po concentration in the muscle tissue, liver and kidney of Pacific walrus (N=5, wet weight) were 28.7, 189, and 174 Bq kg{sup -1}, respectively. This compares with {sup 210}Po concentration values (N=2, wet weight) of 27, 207, and 68 Bq kg{sup -1} measured in the muscle tissue, liver and kidney, of bearded seal, respectively. Estimated bioaccumulation factors--as defined by the radionuclide concentration ratio between the target tissue to that in sea water--were two to three orders of magnitude higher for {sup 210}Po that those of {sup 137}Cs. We conclude from radiological dose estimates that ingestion of {sup 137}Cs in foods derived from walrus and seal will pose no threat to human health. This work has important implications for assessing health risks to Alaskan coastal communities concerned about the dumping of nuclear waste in the Russia Arctic.

  19. Temperature dependent structural, vibrational and magnetic properties of K3Gd5(PO4)6.

    Science.gov (United States)

    Bevara, Samatha; Achary, S Nagabhusan; Mishra, Karuna Kara; Ravindran, T R; Sinha, Anil K; Sastry, P U; Tyagi, Avesh Kumar

    2017-02-22

    Herein we report the evolution of the crystal structure of K3Gd5(PO4)6 in the temperature range from 20 K to 1073 K, as observed from variable temperature X-ray diffraction and Raman spectroscopic studies. K3Gd5(PO4)6 has an open tunnel containing a three dimensional structure built by [Gd5(PO4)6]3- ions which in turn are formed of PO4 tetrahedra and GdOn (n = 8 and 9) polyhedra. The empty tunnels in the structure are occupied by K+ ions and maintain charge neutrality in the lattice. Evolution of unit cell parameters with temperature shows a systematic increase with temperature. The average axial thermal expansion coefficients between 20 K and 1073 K are: αa = 10.6 × 10-6 K-1, αb = 5.5 × 10-6 K-1 and αc = 16.4 × 10-6 K-1. The evolution of distortion indices of the various coordination polyhedra with temperature indicates a gradual decrease with increasing temperature, while those of Gd2O9 and K2O8 polyhedra show opposite trends. The overall anisotropy of the lattice thermal expansion is found to be controlled largely by the effect of temperature on GdOn polyhedra and their linkages. Temperature dependent Raman spectroscopic studies indicated that the intensities and wavenumbers of most of the Raman modes decrease continuously with increasing temperature. Anharmonic analyses of Raman modes indicated that the lattice, rigid translation and librational modes have larger contributions towards thermal expansion of K3Gd5(PO4)6 compared to high frequency internal modes. The temperature and field dependent magnetic measurements indicated no long range ordering down to 2 K and the observed effective magnetic moment per Gd3+ ion and the Weiss constant are 7.91 μB and 0.38 K, respectively.

  20. Analyzing Electromagnetic Systems on Electrically Large Platform Using a GTM-PO Hybrid Method with Synthetic Basis Functions

    Directory of Open Access Journals (Sweden)

    Shang Xiang

    2014-01-01

    Full Text Available A hybrid method of generalized transition matrix (GTM and physical optics (PO with synthetic basis functions (SBF is proposed to analyze electromagnetic systems on electrically large platforms. Based on domain decomposition method (DDM, the proposed approach is to divide the whole problem into a GTM region and a PO region. The GTM algorithm can simulate antennas and scatterers accurately, and the PO algorithm is applied to obtain current distribution on the electrically large platform. With the characteristics extraction technique using SBFs on the GTM models, the number of unknowns can be greatly reduced and the computational efficiency can be further improved. PO region is regarded as an environment background and the unknowns in the PO region need not to be directly solved. Numerical examples will be shown to demonstrate the feasibility of the hybrid method.

  1. Variations of {sup 210}Po and {sup 210}Pb in various marine organisms from Western English Channel: contribution of {sup 210}Po to the radiation dose

    Energy Technology Data Exchange (ETDEWEB)

    Connan, O. [Institut de Radioprotection et de Surete Nucleaire, Laboratoire de Radioecologie de Cherbourg-Octeville, IRSN/DEI/SECRE/LRC, Rue Max Pol Fouchet, 50130 Cherbourg-Octeville (France)], E-mail: olivier.connan@irsn.fr; Germain, P.; Solier, L.; Gouret, G. [Institut de Radioprotection et de Surete Nucleaire, Laboratoire de Radioecologie de Cherbourg-Octeville, IRSN/DEI/SECRE/LRC, Rue Max Pol Fouchet, 50130 Cherbourg-Octeville (France)

    2007-10-15

    Measurements of {sup 210}Po were carried out in various marine matrices (mussels, oysters, seaweed, fish, and abalones) and in seawater at several points along the French coast, over a period of 2 years (2003-2005). These measurements contribute to a better knowledge of this element, since few recent data exist for the French coast. Marked seasonal variations have been revealed in some species and there are differences according to the way of life of these species. Activities in mussels (Mytilus edulis) and oysters (Crassostrea gigas) are similar and varying between 90 and 600 Bq kg{sup -1} (d.w.). Activities in macroalgae (Fucus serratus) are lowest, between 4 and 16 Bq kg{sup -1} (d.w.). In oyster, abalone (Haliotis tuberculata) and fish (Solea solea, Sparus sp.), the strongest activities are measured in the digestive glands, the gills and the gonads. {sup 210}Po/{sup 210}Pb ratios in all cases have values of more than one for all species. From a significant number of measurements, CFs were calculated for seaweed (between 4.6 x 10{sup 3} and 5.0 x 10{sup 3}) and for molluscs, with highest CFs (>10{sup 5}) found for the digestive gland and gills of the oysters, the digestive gland of the abalones and the liver of fish. Finally, the activities measured have made it possible to estimate the internal dose from chronic exposure due to {sup 210}Po received by the marine organisms (0.05 {mu}G h{sup -1} for macroalgae, between 0.70 and 1.5 {mu}G h{sup -1} for mussels and oyster), and the contribution of seafood to the dose received by humans (46-129 {mu}Sv y{sup -1})

  2. Engaging Scientists in Meaningful E/PO: How the NASA SMD E/PO Community Addresses the Needs of the Higher Ed Community

    Science.gov (United States)

    Manning, James; Meinke, Bonnie K.; Schultz, Gregory R.; Smith, Denise A.; Lawton, Brandon L.; Gurton, Suzanne; NASA Astrophysics E/PO Community

    2015-01-01

    The NASA Astrophysics Science Education and Public Outreach Forum (SEPOF) coordinates the work of NASA Science Mission Directorate (SMD) Astrophysics EPO projects and their teams to bring cutting-edge discoveries of NASA missions to the introductory astronomy college classroom. The Astrophysics Forum assists scientist and educator involvement in SMD E/PO (uniquely poised to foster collaboration between scientists with content expertise and educators with pedagogy expertise) and makes SMD E/PO resources and expertise accessible to the science and education communities. We present three new opportunities for college instructors to bring the latest NASA discoveries in Astrophysics into their classrooms.To address the expressed needs of the higher education community, the Astrophysics Forum collaborated with the Astrophysics E/PO community, researchers, and Astronomy 101 instructors to place individual science discoveries and learning resources into context for higher education audiences. Among these resources are two Resource Guides on the topics of cosmology and exoplanets, each including a variety of accessible sources.The Astrophysics Forum also coordinates the development of the Astro 101 slide set series--5 to 7-slide presentations on new discoveries from NASA Astrophysics missions relevant to topics in introductory astronomy courses. These sets enable Astronomy 101 instructors to include new discoveries not yet in their textbooks into the broader context of the course: http://www.astrosociety.org/education/astronomy-resource-guides/.The Astrophysics Forum also coordinated the development of 12 monthly Universe Discovery Guides, each featuring a theme and a representative object well-placed for viewing, with an accompanying interpretive story, strategies for conveying the topics, and supporting NASA-approved education activities and background information from a spectrum of NASA missions and programs: http://nightsky.jpl.nasa.gov/news-display.cfm?News_ID=611

  3. A novel Bi4Ti3O12/Ag3PO4 heterojunction photocatalyst with enhanced photocatalytic performance

    Science.gov (United States)

    Zheng, Chengxiang; Yang, Hua; Cui, Ziming; Zhang, Haimin; Wang, Xiangxian

    2017-11-01

    In this work, we integrated Ag3PO4 with Bi4Ti3O12 to form Bi4Ti3O12/Ag3PO4 heterojunction nanocomposites by an ion-exchange method. The as-prepared Bi4Ti3O12/Ag3PO4 composites were systematically characterized by means of XRD, SEM, TEM, BET, XPS, UV-vis DRS, EIS, PL spectroscopy, and photocurrent response. SEM, TEM, and XPS results demonstrate the creation of Bi4Ti3O12/Ag3PO4 heterojunction with obvious interfacial interaction between Bi4Ti3O12 and Ag3PO4. PL spectra, EIS spectra, and photocurrent responses reveal that the composites display an enhanced separation efficiency of photogenerated electron-hole pairs, which is due to the charge transfer between Bi4Ti3O12 and Ag3PO4. Rhodamine B (RhB) was chosen as the target organic pollutant to evaluate its degradation behavior over Bi4Ti3O12/Ag3PO4 composites under simulated sunlight irradiation. Compared to bare Bi4Ti3O12 and Ag3PO4 nanoparticles, the composites exhibit a significantly enhanced photocatalytic activity. The highest photocatalytic activity is observed for the 10% Bi4Ti3O12/Ag3PO4 composite with 10% Bi4Ti3O12 content, which is about 2.6 times higher than that of bare Ag3PO4. The photocatalytic mechanism involved was investigated and discussed in detail.

  4. A novel molecular sieve supporting material for enhancing activity and stability of Ag3PO4 photocatalyst

    Science.gov (United States)

    Wu, Qiang; Wang, Peifu; Niu, Futao; Huang, Cunping; Li, Yang; Yao, Weifeng

    2016-08-01

    A small-pore silicon-substituted silicon aluminum phosphate (SAPO-34) molecular sieve, for the first time, is reported to significantly increase both the activity and life span of Ag3PO4 photocatalyst for visible-light degradation of methylene blue (MB) and rhodamine B (RhB). Results show that 60 wt.% Ag3PO4/SAPO-34 exhibits the highest photocatalytic degradation efficiencies for both MB (91.0% degradation within 2.0 min) and RhB (91.0% degradation within 7.0 min). In comparison, pure Ag3PO4 powder photocatalyst requires 8.0 min and 12.0 min for decomposing 91.0% of MB and RhB, respectively. During MB degradation the rate constant for 60 wt.% Ag3PO4/SAPO-34 increases 317.2% in comparison with the rate constant of pure Ag3PO4. This activity is also much higher than literature reported composite or supported Ag3PO4 photocatalysts. In three photocatalytic runs for the degradation of RhB, the rate constant for 60 wt.% Ag3PO4/SAPO-34 reduces from 0.33 to 0.18 min-1 (45.5% efficiency loss). In contrast, the rate constant of pure Ag3PO4 catalyst decreases from 0.2 to 0.07 min-1 (80.0% efficiency loss). All experimental results have shown that small pores and zero light absorption loss of SAPO-34 molecular sieves minimize Ag3PO4 loading, enhance photocatalytic activity and prolong the lifespan of Ag3PO4 photocatalyst.

  5. A novel Bi4Ti3O12/Ag3PO4heterojunction photocatalyst with enhanced photocatalytic performance.

    Science.gov (United States)

    Zheng, Chengxiang; Yang, Hua; Cui, Ziming; Zhang, Haimin; Wang, Xiangxian

    2017-11-28

    In this work, we integrated Ag 3 PO 4 with Bi 4 Ti 3 O 12 to form Bi 4 Ti 3 O 12 /Ag 3 PO 4 heterojunction nanocomposites by an ion-exchange method. The as-prepared Bi 4 Ti 3 O 12 /Ag 3 PO 4 composites were systematically characterized by means of XRD, SEM, TEM, BET, XPS, UV-vis DRS, EIS, PL spectroscopy, and photocurrent response. SEM, TEM, and XPS results demonstrate the creation of Bi 4 Ti 3 O 12 /Ag 3 PO 4 heterojunction with obvious interfacial interaction between Bi 4 Ti 3 O 12 and Ag 3 PO 4 . PL spectra, EIS spectra, and photocurrent responses reveal that the composites display an enhanced separation efficiency of photogenerated electron-hole pairs, which is due to the charge transfer between Bi 4 Ti 3 O 12 and Ag 3 PO 4 . Rhodamine B (RhB) was chosen as the target organic pollutant to evaluate its degradation behavior over Bi 4 Ti 3 O 12 /Ag 3 PO 4 composites under simulated sunlight irradiation. Compared to bare Bi 4 Ti 3 O 12 and Ag 3 PO 4 nanoparticles, the composites exhibit a significantly enhanced photocatalytic activity. The highest photocatalytic activity is observed for the 10% Bi 4 Ti 3 O 12 /Ag 3 PO 4 composite with 10% Bi 4 Ti 3 O 12 content, which is about 2.6 times higher than that of bare Ag 3 PO 4 . The photocatalytic mechanism involved was investigated and discussed in detail.

  6. KONFLIK SOPIR PO. MITRA KENCANA VS PENGEMUDI BETOR DI AIR BANGIS, KAB. PASAMAN BARAT

    Directory of Open Access Journals (Sweden)

    Helma Frida

    2013-06-01

    Full Text Available In 2003 the events that many casualties. Where this event originated from a dispute between the driver PO. Mitra Kencana with Pedicab driver Motor in getting the passengers on Air Bangis Nagari, in this event is not only a victim but a more serious matter is the lives that four people falling PO driver. Partners Ujung Gading Kencana of Nagari and the residents Nagari Air Bangis and many more injuries from the incident. The study included a qualitative study of History, therefore, the study of the social conflict between the driver PO. Mitra Kencana and Motor rickshaw driver in Pasaman from 2003-2006, carried out using the procedure History research, namely: (1 Heuristics, (2 source criticism, (3 interpretation, and (4 the presentation of research results in the form of writing scientific history or Historiography. The results of this study indicate that since the tragedy that occurred in 2003 in Pasaman, kususnya Air Bangis major events occurred which resulted in loss of life, be more careful if there is a problem among the community. Pada tahun 2003 terjadinya peristiwa yang banyak menelan korban. Dimana peristiwa ini berawal dari perselisihan antara sopir PO. Mitra Kencana dengan Pengemudi Becak Motor dalam memperebutkan penumpang di Nagari Air Bangis, dalam peristiwa ini tidak hanya korban materi namun yang lebih parah adalah korban jiwa yang berjatuhan yaitu empat orang sopir PO. Mitra Kencana dari Nagari Ujung Gading dan satu orang warga Nagari Air Bangis dan masih banyak lagi korban luka-luka dari peristiwa tersebut. Penelitian termasuk penelitian kualitatif Sejarah, oleh sebab itu kajian mengenai konflik sosial antara Sopir PO. Mitra Kencana dengan Pengemudi Becak Motor di Kabupaten Pasaman tahun 2003-2006, dilakukan dengan menggunakan prosedur penelitian Sejarah yaitu: (1 Heuristik, (2 kritik sumber, (3 interpretasi, dan (4 penyajian hasil penelitian dalam bentuk penulisan sejarah ilmiah atau Historiografi. Hasil penelitian ini

  7. CINETIQUE DES IONS PHOSPHORIQUES H2PO4- ET HPO4-2 EN MILIEU GYPSEUX

    Directory of Open Access Journals (Sweden)

    Hacène BOUZIANE

    2011-06-01

    Full Text Available L’étude de la fixation des ions H2PO4- et HPO4-2 par les divers types de gypse (tassé ; feuilleté ; fibreux. Donne une réaction positive quelle que soit la solution phosphaté et le type de gypse utilisé. Il convient de noter que l’adsorption est beaucoup plus forte pour les ions H2PO4- que celle des ions HPO4-2 et qu’elle varie d’un type de gypse à l’autre.                 L’étude de l’influence du temps, de la granulométrie et de la concentration des solutions montrent en effet que : plus le diamètre du grain est petit, plus l’adsorption est forte. La fixation se produit même pour une solution phosphatée à très faible concentration ; il se produit toujours une réaction avec précipitation et non un équilibre d’adsorption. La réaction des ions phosphatés augment rapidement dans les premières minutes quel que soit le type de gypse et la concentration utilisée. Nous avons abouti à la formation d’un gel phosphaté, visqueux et non soluble. L’analyse chimique de ce gel donne les résultats suivants : PO4=54,20% ,Ca=11,30% , K=32,94%; si l’on compare ces résultats avec les résultats calculés pour K3CaH,(PO42=PO4=54,59%, Ca=11,19%, K=33,62%, nos valeurs sont très voisines de celles-ci. Il s’agit donc du même sel sur lequel aucun travail sur la formation de K3CaH(PO42 à partir de CaSO42H2O ne semble avoir été publié.

  8. Wybrane zaburzenia funkcji poznawczych po udarze mózgu – charakterystyka kliniczna i diagnostyka

    Directory of Open Access Journals (Sweden)

    Magdalena Sabiniewicz

    2015-04-01

    Full Text Available Udar mózgu znacznie zwiększa ryzyko rozwoju zaburzeń poznawczych. Badania wskazują, że jest przyczyną występowania zaburzeń poznawczych u około ⅔ chorych po 65. roku życia. Deficyty powstałe po udarze mózgu mogą obejmować wszystkie obszary codziennego funkcjonowania. Czynnikiem determinującym rodzaj objawów klinicznych jest przede wszystkim lokalizacja, obszar uszkodzenia mózgu. Zaburzenia poznawcze wpływają na efekty leczenia i rehabilitacji oraz jakość życia chorego. Do oceny aktywności kognitywnej stosowane są odpowiednie testy i kliniczno-eksperymentalne próby neuropsychologiczne o różnym stopniu czułości diagnostycznej. Dysfunkcje mogą dotyczyć wielu obszarów poznawczych lub ich izolowanych aspektów. Przebieg kliniczny charakteryzuje łagodna postać zaburzeń poznawczych albo postać rozwinięta, wieloobjawowa, jak w otępieniu naczyniopochodnym. Istnieje potrzeba stworzenia ogólnych zaleceń co do diagnostyki i terapii zaburzeń poznawczych u chorych po udarze mózgu. Praca przedstawia najważniejsze i najczęstsze zaburzenia funkcji poznawczych u pacjentów po udarze niedokrwiennym, charakterystykę kliniczną tych objawów, a także możliwości diagnostyki. Zwrócono uwagę na wzajemny wpływ nastroju podstawowego i funkcjonowania kognitywnego. Ponadto omówiono wpływ czynników kluczowych dla funkcjonowania poznawczego chorego po udarze mózgu na rokowanie. Obraz kliniczny zaburzeń poznawczych po udarze obejmuje objawy ogólnomózgowe i specyficzne. Symptomy nieswoiste są odpowiedzią organizmu na zaburzenie homeostazy układu przez nagły incydent naczyniowy, a charakterystyka symptomów specyficznych zależy od lokalizacji uszkodzenia organicznego.

  9. State detection of LiFePO{sub 4} batteries for hybrid vehicles and electromobiles; Zustandserkennung von LiFePO{sub 4}-Batterien fuer Hybrid- und Elektrofahrzeuge

    Energy Technology Data Exchange (ETDEWEB)

    Roscher, Michael Andreas

    2011-07-01

    This publication provides a comprehensive description of the specific electrical properties of LiFePO{sub 4}-based cells, comparing them with those of alternative technologies, and presents model approaches to representing specific sub-aspects of battery behaviour. This provides the groundwork for the following presentation of model-based methods of determining the state of a battery in terms of battery performance, charge state and degree of battery aging giving due consideration to the special characteristics of iron phosphate based lithium ion cells. A special emphasis is placed on designing the method such that it permits a both simple and reliable determination of the states of a large number of individual lithium ion cells. [German] ln dieser Arbeit werden die spezifischen elektrischen Eigenschaften von LiFePO{sub 4}-basierten Zellen umfassend beleuchtet, mit Eigenschaften alternativer Technologien verglichen und Modellansaetze dargelegt, mit denen es moeglich ist, spezielle Teilaspekte des Batterieverhaltens abzubilden. Aufbauend darauf werden modellbasierte Verfahren zur Bestimmung der Zellzustaende Leistungsfaehigkeit, Ladezustand und Grad der Batteriealterung vorgestellt, welche die besonderen Charakteristika der Lithium-Eisenphosphat-basierten Zellen beruecksichtigen. Die entwickelten Verfahren so zu gestalten, dass damit die Zustaende einer Vielzahl einzelner Lithium-Ionen-Zellen auf einfache Weise zuverlaessig bestimmt werden koennen, findet dabei besondere Beachtung.

  10. “Dérives du poème”. La poétique dans l’oeuvre de Gaston Bachelard et le travail critique de Claude Esteban

    Directory of Open Access Journals (Sweden)

    Satenik Bagdasarova

    2012-10-01

    Full Text Available Drawing on Claude Esteban’s essay “Dérives du poème”, this article offers a critical analysis of the conception of language underpinning the investment of the poetic act according to Bachelard. Published in Critique de la raison poétique in 1978 and typifying a 1980s critical approach, Esteban’s essay shows how Bachelard maintains and upholds the primacy of philosophy over poetics while at the same time claiming to surmount it. Through the prelinguistic union of words and things, and his investment of discourse in the word, Bachelard effectively reinforced the involvement of poetics in metaphysics, whereas his aim had been to disassociate the one from the other. In demonstrating the invalidity of conceiving the word as a category and model of speech – a move which leads, in Bachelard’s conception, to the annihilation of the subject’s empirical activity in language, to the advantage of Being – Claude Esteban highlights the necessity of interaction between poetics and linguistics. His questioning of those linguistic categories taken for granted by Bachelard aims in particular at the disassociation of poetics from myth, and at a corresponding move towards anthropology. This in turn allows us to reflect on the historic continuity of literary works and their capacity to shift social values.

  11. Caspase-1-like regulation of the proPO-system and role of ppA and caspase-1-like cleaved peptides from proPO in innate immunity.

    Directory of Open Access Journals (Sweden)

    Miti Jearaphunt

    2014-04-01

    Full Text Available Invertebrates rely on innate immunity to respond to the entry of foreign microorganisms. One of the important innate immune responses in arthropods is the activation of prophenoloxidase (proPO by a proteolytic cascade finalized by the proPO-activating enzyme (ppA, which leads to melanization and the elimination of pathogens. Proteolytic cascades play a crucial role in innate immune reactions because they can be triggered more quickly than immune responses that require altered gene expression. Caspases are intracellular proteases involved in tightly regulated limited proteolysis of downstream processes and are also involved in inflammatory responses to infections for example by activation of interleukin 1ß. Here we show for the first time a link between caspase cleavage of proPO and release of this protein and the biological function of these fragments in response to bacterial infection in crayfish. Different fragments from the cleavage of proPO were studied to determine their roles in bacterial clearance and antimicrobial activity. These fragments include proPO-ppA, the N-terminal part of proPO cleaved by ppA, and proPO-casp1 and proPO-casp2, the fragments from the N-terminus after cleavage by caspase-1. The recombinant proteins corresponding to all three of these peptide fragments exhibited bacterial clearance activity in vivo, and proPO-ppA had antimicrobial activity, as evidenced by a drastic decrease in the number of Escherichia coli in vitro. The bacteria incubated with the proPO-ppA fragment were agglutinated and their cell morphology was altered. Our findings show an evolutionary conserved role for caspase cleavage in inflammation, and for the first time show a link between caspase induced inflammation and melanization. Further we give a more detailed understanding of how the proPO system is regulated in time and place and a role for the peptide generated by activation of proPO as well as for the peptides resulting from Caspase 1

  12. Specific electrical conductivity in molten potassium dihydrogen phosphate KH2PO4 - An electrolyte for water electrolysis at ∼300°C

    DEFF Research Database (Denmark)

    Nikiforov, Aleksey Valerievich; Berg, Rolf W.; Petrushina, Irina

    2016-01-01

    The conductivity of pure molten KH2PO4 salt and four mixtures with more or less water (KH2PO4-H2O and KH2PO4-KPO3 systems, respectively) were measured at temperatures of 240-320°C and under their own water vapor pressures. Molten KH2PO4 has been proven to be a promising electrolyte for an elevate...

  13. Ruthenium oxides supported on heterostructured CoPO-MCF materials for catalytic oxidation of vinyl chloride emissions.

    Science.gov (United States)

    Wang, Chao; Tian, Chengcheng; Guo, Yanglong; Zhang, Zhendong; Hua, Wenchao; Zhan, Wangcheng; Guo, Yun; Wang, Li; Lu, Guanzhong

    2018-01-15

    A novel heterostructured material, cobalt phosphate-SiO2 mesostructured cellular foams (CoPO-MCF), was successfully synthesized by in situ growth. The material was characterized by X-ray diffraction (XRD), nitrogen sorption, temperature-programmed reduction (H2-TPR and CO-TPR), temperature-programmed desorption of NH3 (NH3-TPD), and X-ray photoelectron spectroscopy (XPS). A ruthenium precursor was readily introduced and highly dispersed on the CoPO nanophases of the CoPO-MCF through an impregnation method. The resulting Ru/CoPO-MCF catalyst exhibited high catalytic activity for the oxidation of vinyl chloride (VC). The results of three consecutive runs and long-term tests showed high stability of the Ru/CoPO-MCF for the catalytic oxidation of VC. The unique heterostructures of the CoPO-MCF not only improve the reducibility and acidity of the MCF but also strengthen the interaction between ruthenium oxide nanoparticles and the CoPO-MCF support, which contributes to the enhanced catalytic performance. Copyright © 2017 Elsevier B.V. All rights reserved.

  14. Excess of polonium-210 activity in the surface urban atmosphere. Part 2: origin of ²¹⁰Po excess.

    Science.gov (United States)

    Długosz-Lisiecka, Magdalena

    2015-02-01

    The presence of significant (210)Po activity, unsupported by its grandparent radionuclide (210)Pb, in the surface atmosphere of industrialized regions can originate from human technical activities. In urban air, the activity ratio of (210)Po to (210)Pb might increase as a result of natural condensation and coagulation processes of relatively volatile (210)Po-containing species emitted during coal combustion processes. The presence of excess of (210)Po cannot be explained by its in-growth from radioactive decay of (210)Bi. About 50% of (210)Po radionuclide released during coal combustion processes can be emitted into air as gaseous or ultrafine products. Subsequently, these products are quickly attached to the surface of fine particles suspended in the air. As a result, an excess of (210)Po activity in aerosols has been reported. However, in this manner, As much as 11 GBq of (210)Po per year can enter the urban air from the local coal power plants in Lodz city, Poland.

  15. Distribution of {sup 210}Pb and {sup 210}Po concentrations in wild berries and mushrooms in boreal forest ecosystems

    Energy Technology Data Exchange (ETDEWEB)

    Vaaramaa, Kaisa, E-mail: Kaisa.Vaaramaa@Helsinki.fi [Laboratory of Radiochemistry, Department of Chemistry, P.O. Box 55, FI-00014 University of Helsinki (Finland); Solatie, Dina [STUK-Radiation and Nuclear Safety Authority, Regional Laboratory in Northern Finland, FI-96500 Rovaniemi (Finland); Aro, Lasse [Finnish Forest Research Institute (METLA), Parkano Research Unit, FI-39700 Parkano (Finland)

    2009-12-15

    The activity concentrations and distribution of {sup 210}Pb and {sup 210}Po in wild berries and edible mushrooms were investigated in Finnish forests. The main study areas were located in Scots pine (Pinus sylvestris L.) forests in southern and northern Finland. The activity concentrations of {sup 210}Pb and {sup 210}Po in blueberry (Vaccinium myrtillus L.) and lingonberry (Vaccinium vitis-idaea L.) samples decreased in the order: stems > leaves > berries (i.e. fruits). The activity ratios of {sup 210}Po/{sup 210}Pb in the wild berry samples were mainly higher than one, indicating elevated activity concentrations of polonium in the samples. In mushrooms the activity concentrations of {sup 210}Pb and especially {sup 210}Po were higher than in fruits of the wild berries. The highest activity concentration of {sup 210}Pb was detected in Cortinarius armillatus L. (16.2 Bq kg{sup -1} d.w.) and the lowest in Leccinum vulpinum L. (1.38 Bq kg{sup -1} d.w.). The {sup 210}Po activity concentrations of the whole fruiting bodies ranged from 7.14 Bq kg{sup -1} d.w. (Russula paludosa L.) to 1174 Bq kg{sup -1} d.w. (L. vulpinum L.). In general, the highest activity concentrations of {sup 210}Po were recorded in boletes. The caps of mushrooms of the Boletaceae family showed higher activity concentrations of {sup 210}Po compared to the stipes. In most of the mushrooms analyzed, the activity concentrations of {sup 210}Po were higher than those of {sup 210}Pb. {sup 210}Po and {sup 210}Pb dominate the radiation doses received via ingestion of wild berries and mushrooms in northern Finland, while in southern Finland the ingested dose is dominated by {sup 137}Cs from the Chernobyl fallout.

  16. Distribution of 210Pb and 210Po concentrations in wild berries and mushrooms in boreal forest ecosystems.

    Science.gov (United States)

    Vaaramaa, Kaisa; Solatie, Dina; Aro, Lasse

    2009-12-15

    The activity concentrations and distribution of 210Pb and 210Po in wild berries and edible mushrooms were investigated in Finnish forests. The main study areas were located in Scots pine (Pinus sylvestris L.) forests in southern and northern Finland. The activity concentrations of 210Pb and 210Po in blueberry (Vaccinium myrtillus L.) and lingonberry (Vaccinium vitis-idaea L.) samples decreased in the order: stems>leaves>berries (i.e. fruits). The activity ratios of 210Po/210Pb in the wild berry samples were mainly higher than one, indicating elevated activity concentrations of polonium in the samples. In mushrooms the activity concentrations of 210Pb and especially 210Po were higher than in fruits of the wild berries. The highest activity concentration of 210Pb was detected in Cortinarius armillatus L. (16.2 Bq kg(-1) d.w.) and the lowest in Leccinum vulpinum L. (1.38 Bq kg(-1) d.w.). The 210Po activity concentrations of the whole fruiting bodies ranged from 7.14 Bq kg(-1) d.w. (Russula paludosa L.) to 1174 Bq kg(-1) d.w. (L. vulpinum L.). In general, the highest activity concentrations of 210Po were recorded in boletes. The caps of mushrooms of the Boletaceae family showed higher activity concentrations of 210Po compared to the stipes. In most of the mushrooms analyzed, the activity concentrations of 210Po were higher than those of 210Pb. 210Po and 210Pb dominate the radiation doses received via ingestion of wild berries and mushrooms in northern Finland, while in southern Finland the ingested dose is dominated by 137Cs from the Chernobyl fallout.

  17. A cell wall-bound anionic peroxidase, PtrPO21, is involved in lignin polymerization in Populus trichocarpa

    Energy Technology Data Exchange (ETDEWEB)

    Lin, Chien-Yuan; Li, Quanzi; Tunlaya-Anukit, Sermsawat; Shi, Rui; Sun, Ying-Hsuan; Wang, Jack P.; Liu, Jie; Loziuk, Philip; Edmunds, Charles W.; Miller, Zachary D.; Peszlen, Ilona; Muddiman, David C.; Sederoff, Ronald R.; Chiang, Vincent L.

    2016-03-11

    Class III peroxidases are members of a large plant-specific sequence-heterogeneous protein family. Several sequence-conserved homologs have been associated with lignin polymerization in Arabidopsis thaliana, Oryza sativa, Nicotiana tabacum, Zinnia elegans, Picea abies, and Pinus sylvestris. In Populus trichocarpa, a model species for studies of wood formation, the peroxidases involved in lignin biosynthesis have not yet been identified. To do this, we retrieved sequences of all PtrPOs from Peroxibase and conducted RNA-seq to identify candidates. Transcripts from 42 PtrPOs were detected in stem differentiating xylem (SDX) and four of them are the most xylem-abundant (PtrPO12, PtrPO21, PtrPO42, and PtrPO64). PtrPO21 shows xylem-specific expression similar to that of genes encoding the monolignol biosynthetic enzymes. Using protein cleavage-isotope dilution mass spectrometry, PtrPO21 is detected only in the cell wall fraction and not in the soluble fraction. Downregulated transgenics of PtrPO21 have a lignin reduction of ~20% with subunit composition (S/G ratio) similar to wild type. The transgenics show a growth reduction and reddish color of stem wood. The modulus of elasticity (MOE) of the stems of the downregulated PtrPO21-line 8 can be reduced to ~60% of wild type. Differentially expressed gene (DEG) analysis of PtrPO21 downregulated transgenics identified a significant overexpression of PtPrx35, suggesting a compensatory effect within the peroxidase family. No significant changes in the expression of the 49 P. trichocarpa laccases (PtrLACs) were observed.

  18. De ‘o’ van Lampe: ‘Je wilt in het gedicht blijven’. : De poëtische aanwezigheid van de dichterlijke stem

    NARCIS (Netherlands)

    van der Starre, Kila

    Kila van der Starre onderzoekt hoe de ‘o’ de poëtische aanwezigheid van de dichterlijke stem benadrukt in de poëzie van Astrid Lampe. Thomas Vaessens en Jos Joosten stellen in hun boek 'Postmoderne poëzie in Nederland en Vlaanderen' (2003) dat postmoderne dichters zich lijken te verzetten tegen de

  19. A compositional method to model dependent failure behavior based on PoF models

    Directory of Open Access Journals (Sweden)

    Zhiguo ZENG

    2017-10-01

    Full Text Available In this paper, a new method is developed to model dependent failure behavior among failure mechanisms. Unlike the existing methods, the developed method models the root cause of the dependency explicitly, so that a deterministic model, rather than a probabilistic one, can be established. Three steps comprise the developed method. First, physics-of-failure (PoF models are utilized to model each failure mechanism. Then, interactions among failure mechanisms are modeled as a combination of three basic relations, competition, superposition and coupling. This is the reason why the method is referred to as “compositional method”. Finally, the PoF models and the interaction model are combined to develop a deterministic model of the dependent failure behavior. As a demonstration, the method is applied on an actual spool and the developed failure behavior model is validated by a wear test. The result demonstrates that the compositional method is an effective way to model dependent failure behavior.

  20. Moterų požiūrio į karjeros planavimo galimybes kaita

    OpenAIRE

    Mociūtė, Alina

    2012-01-01

    Šiame magistrantūros darbe nagrinėjamas moterų požiūris į karjeros planavimo galimybių kaitą. Kaip prieš 30 metų moteris planavo savo karjerą ir kaip jaunos moterys šiandien planuoja savo karjerą. Darbo tikslas - nustatyti moterų požiūrį į karjeros planavimo galimybių kaitą. Darbo tikslui nustatyti iškelti šie uždaviniai: 1. Apibūdinti moters karjeros ir karjeros planavimo sampratas. 2. Aprašyti moters karjeros sampratą įtakojantį socialinį kontekstą prieš 30 m. ir dabar....

  1. Le Baudelaire de Benveniste entre stylistique et poétique

    OpenAIRE

    Dessons, Gérard

    2012-01-01

    Ces manuscrits, qui représentent l’état inachevé d’une recherche sur le « langage poétique », sont la tentative de penser, à travers l’étude des Fleurs du mal, une signifiance particulière du langage. Bien que les protocoles d’analyse relèvent souvent d’un point de vue stylistique (catégories de la langue, emploi de la notion de fréquence), c’est bien une visée particulière, spécifique à la pratique poétique qui est poursuivie, qui étend la syntaxe jusqu’à la rime These manuscripts represe...

  2. Co-synthesis of LiFePO4 and Carbon Nanotubes

    Energy Technology Data Exchange (ETDEWEB)

    Wilcox, James; Doeff, Marca M.

    2006-05-26

    The rate capabilities of LiFePO{sub 4} composites are dependent on the structure of the carbon that coats the powders, formed during co-calcination with carbon containing precursors. The addition of readily decomposed pyromellitic acid and graphitization catalysts such as ferrocene during synthesis results in coatings with low D/G (disordered/graphene) ratios, while maintaining the carbon content of the powders below 2 wt. %. This is important to avoid adversely affecting the tap density. The good correlation between the pressed pellet conductivities of the LiFePO{sub 4}/C composites and their rate capability in lithium cells is further confirmation of the importance of the carbon structure, because graphitic carbons generally have higher conductivities than disordered ones.

  3. Indentation recovery in GdPO4 and observation of deformation twinning

    Directory of Open Access Journals (Sweden)

    Taylor M. Wilkinson

    2016-09-01

    Full Text Available A series of nanoindentation tests on both single and polycrystalline specimens of a monazite rare-earth orthophosphate, GdPO4, revealed frequent observation of anomalous unloading behavior with a large degree of recovery, where previously this behavior had only been observed in xenotime-structure rare-earth orthophosphates. An indentation site in the polycrystalline sample was examined using TEM to identify the deformation mechanism responsible for recovery. The presence of a twin along the (100 orientation, along with a series of stacking faults contained within the deformation site, provide evidence that the mechanism of recovery in GdPO4 is the collapse of deformation twins during unloading.

  4. Structural and ionic transport properties of Li 2AlZr[PO 4] 3

    Science.gov (United States)

    Savitha, T.; Selvasekarapandian, S.; Ramya, C. S.; Bhuvaneswari, M. S.; Hirankumar, G.; Baskaran, R.; Angelo, P. C.

    The fast ionic conductor Li 2AlZr[PO 4] 3 has been prepared by the solid state reaction method. The formation of the compound is confirmed by XRD and FTIR analysis. The system has been subjected to ac conductivity measurements in the temperature range 523 to 623 K with aluminium as blocking electrodes over a frequency range of 42 Hz to 5 MHz. The conductivity is found to be 1 × 10 -5 S cm -1 at 623 K. The activation energy calculated from the Arrhenius plot is 0.83 eV. The conductance spectrum reveals a d.c. plateau and a dispersive region that suggest the correlated hopping motion of ions. Thus, the conduction mechanism in Li 2AlZr[PO 4] 3 may be due to the hopping of charge carriers.

  5. Un poète grec francophone : Théo Crassas (entretien

    Directory of Open Access Journals (Sweden)

    Daniel Aranjo

    2012-10-01

    Full Text Available Dans cet entretien, l’auteur interroge le poète grec Théo Crassas sur ses raisons d’écrire en français. Le contexte familial - un oncle poète et francophone, ainsi que ses parents, éclaire ce choix. S’il est vrai que le français n’est plus la langue impériale qu’il fut longtemps, il n’en demeure pas moins une école universelle, de par ses auteurs classiques qui ont consacré son universalité. À ce titre, le français demeurera aussi capital dans l’histoire des humanités que le grec ancien ou le latin. Crassas se définit comme un cas singulier, car il n’écrit ses textes qu’en français.

  6. Paolo Maccari : une figuration poétique du combat intérieur

    OpenAIRE

    gouchan, yannick

    2011-01-01

    International audience; Maccari fait partie de la jeune génération des auteurs italiens de poésie, la génération qui est née dans les années soixante-dix. Il a publié deux recueils de poèmes, Ospiti en 2000 et, en 2006, Mondanità. Autour des thématiques de la maladie emblématique, de la douleur et de la lutte du corps, nous proposons d’effectuer une analyse de l’écriture de Maccari sous l’angle d’une vision problématique du ‘monde’ (au sens léopardien). Il s’agira de mettre en évidence les fo...

  7. Efficient power supply using Power over Ethernet; Effiziente Stromversorgung mittels Power over Ethernet (PoE)

    Energy Technology Data Exchange (ETDEWEB)

    Huser, A.

    2005-07-01

    This final report for the Swiss Federal Office of Energy (SFOE) takes a look at methods of supplying small equipment such as Internet telephones, web cams, hubs, hard discs, audio equipment, point-of-sale terminals, game consoles etc. with power via their Ethernet connections. A short comparison is presented between Power over Ethernet (PoE) and other methods of supplying power along with data, including Universal Serial Bus (USB), FireWire and Powerline systems. The advantages of PoE over the use of separate power supply units are discussed and recommendations are made to the manufacturers and users of small peripheral equipment regarding the dimensioning and loading of such power supply systems.

  8. Laser Spectroscopy of GdPO4 . nH2O:Eu Nanomaterials.

    Science.gov (United States)

    Lu, Shaozhe; Zhang, Jiahua; Zhang, Jishen; Shulin, Zhang E; Zhao, Haifeng; Luo, Yongshi

    2016-04-01

    One-dimensional GdPO4 . nH2O:Eu nanowires and nanorods of different sizes and the same structure were synthesized by hydrothermal method. Nanowire and nanorods had width and length of about 10 nm/50 nm and 80 nm/1 µm, respectively. Adjusting reaction system PH value by adding alkali metal NaOH, the size and shape of the product can be tuned. The high resolution spectra, excitation spectra, and laser selective excitation spectra at low temperature were determined. Nanorod compared with nanowire, photoluminescence was enhanced, and the excitation spectrum and laser selective excitation spectra were broadened. These results suggest that Eu3+ in GdPO4 . nH20 nanorod and nanowire were located in different local environments.

  9. Sledování teploty po síti Ethernet

    OpenAIRE

    Khait, Ranny

    2012-01-01

    Hlavním tématem práce je měření a přenos teploty po síti Ethernet. Práce obsahuje teoretický úvod, ve kterém jsou popsány různé typy senzorů, měření teploty, Ethernet a návrh systému a výběr součástek. Praktická část je zaměřená na realizaci systému, popis programu a odesílání změřených hodnot po síti Ethernet. The main topic of the presented thesis is temperature monitoring via Ethernet. This thesis contains theoretical part, in which are described different types of sensors, temperature ...

  10. High efficient multifunctional Ag{sub 3}PO{sub 4} loaded hydroxyapatite nanowires for water treatment

    Energy Technology Data Exchange (ETDEWEB)

    Li, Yaling; Zhou, Hangyu; Zhu, Genxing [Center for Biomaterials and Biopathways, Department of Chemistry, Zhejiang University, Hangzhou (China); Shao, Changyu; Pan, Haihua; Xu, Xurong [Center for Biomaterials and Biopathways, Department of Chemistry, Zhejiang University, Hangzhou (China); Qiushi Academy for Advanced Studies, Zhejiang University (China); Tang, Ruikang, E-mail: rtang@zju.edu.cn [Center for Biomaterials and Biopathways, Department of Chemistry, Zhejiang University, Hangzhou (China); Qiushi Academy for Advanced Studies, Zhejiang University (China)

    2015-12-15

    Highlights: • The multifunctional Ag{sub 3}PO{sub 4} loaded hydroxyapatite (HAP) nanowires were synthesized via a facile in-situ precipitation method. • By optimizing the initial concentration of AgNO{sub 3}, the well-distributed Ag{sub 3}PO{sub 4}/HAP composites could be achieved. • The Ag{sub 3}PO{sub 4}/HAP composites showed excellent photocatalytic performance for the decomposition of dyes under visible light irradiation. • The maximum absorption capacity of the Ag{sub 3}PO{sub 4}/HAP composites for Pb(II) was 250 mg/g, approximately three times as that of pure HAP. • The Ag{sub 3}PO{sub 4}/HAP composites also exhibited excellent antibacterial activities even at relative low concentrations. - Abstract: Organic, inorganic, and biological pollutants are typical water contaminants and they seriously affect water quality. In this study, we suggested that a novel multifunctional Ag{sub 3}PO{sub 4} loaded hydroxyapatite (HAP) material can remove the typical pollutants from water. The Ag{sub 3}PO{sub 4}/HAP composites were synthesized facilely via in-situ precipitation of Ag{sub 3}PO{sub 4} on the pre-existing HAP nanowires. By optimizing the composition of Ag{sub 3}PO{sub 4} and HAP, the material could achieve an optimal photocatalytic activity to decompose rhodamine B (RhB), methyl orange (MO) and methylene blue (MB) under visible light irradiations with enhanced pH stability. Besides, the adsorption of Pb(II) on the Ag{sub 3}PO{sub 4}/HAP reached a maximum capacity of 250 mg/g and this value was approximately three times as that of pure HAP. Furthermore, the composite material exhibited excellent antibacterial activities towards gram-negative bacterium (Escherichia coli) and gram-positive bacterium (Stphylococcus aureus). The results highlighted the cooperative effect between Ag{sub 3}PO{sub 4} and hydroxyapatite (HAP). The simultaneous removals of dyes, toxic metal ions, and bacteria with a high efficiency followed an easy approach for the purification

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

    Energy Technology Data Exchange (ETDEWEB)

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

    2014-09-15

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

  12. VERA-CS User Support Activities for PoR 14

    Energy Technology Data Exchange (ETDEWEB)

    Kochunas, Brendan [Univ. of Michigan, Ann Arbor, MI (United States)

    2017-11-01

    The purpose of this milestone is to document the user support activities that took place between 10/1/2016 and 3/31/2017 (PoR 14). In the normal PHI workflow, that also extends to several activities within RTM, a Kanban process is followed. This involves creating tickets for specific work items and track the progress to complete these specific work items.

  13. Preparation and Characterisation of Activated Carbon From Pumpkin Seed Shell Using H3PO4

    OpenAIRE

    DEMIRAL, Ilknur; AYDIN ŞAMDAN, Canan

    2016-01-01

    In this study, activated carbons were produced from pumpkin seed shell by chemical activation. In chemical activation, H3PO4 was used as chemical agent. The effects of impregnation ratio (IR) and activation temperature were investigated. Activation temperatures and impregnation ratios were selected in the range of 400–600 °C and 1–3, respectively. The surface area, pore volumes, pore size distribution and average pore diameter of the activated carbons were characterized by N2 adsorption at 77...

  14. Shell model description of low-lying states in Po and Rn isotopes

    Directory of Open Access Journals (Sweden)

    Higashiyama Koji

    2014-03-01

    Full Text Available Nuclear structure of the Po and Rn isotopes is theoretically studied in terms of the spherical shell model with the monopole- and quadrupole-pairing plus quadrupole-quadrupole effective interaction. The experimental energy levels of low-lying states are well reproduced. The shell model results are examined in detail in a pair-truncated shell model. The analysis reveals the alignment of two protons in the 0h9/2 orbital at spin 8.

  15. Synthesis of silver nanoparticles-decorated FePO4 nanosphere at a ...

    Indian Academy of Sciences (India)

    Ag/FePO4 nanocomposites on gold (Au) electrode. The morphology and composition of the nanocompos- ites were ..... Table 2. H2O2 detection in detergent samples by the standard addition method. H2O2 found (mM). Sample. H2O2 added (mM). (n = 3). Recovery (%) detergent sample. —. 0.142 (±0.03). —. Sample 1. 0.1.

  16. Tuber mesentericum, an interesting species of black truffles in PoIand

    Directory of Open Access Journals (Sweden)

    Maria Ławrynowicz

    2014-08-01

    Full Text Available Tuber mesentericum Vitt. is the only member of black truffles collected in Po|and in the calcareous area at the Częstochowa Upland. It was discovered in 1981 in old beech wood at the Zielona Góra nature reserve (Ławrynowicz 1988, 1990. Recently it has been collected in ca 30 years old oak forest situated 13 km NE from the Częstochowa town. Taxonomic notes, description of habitat and distribution are given.

  17. Scientific Project, SciencesPo-LIEPP Interdisciplinary research center for the evaluation of public policies

    OpenAIRE

    Etienne Wasmer; Cornelia Woll

    2011-01-01

    Sciences Po develops an interdisciplinary research program for the evaluation of public policies (in French: Laboratoire interdisciplinaire d’évaluation des politiques publiques, LIEPP), based on four founding units: Department of Economics, Centre de Sociologie des Organisations, Centre d’Etudes Européennes and Observatoire Sociologique du Changement. Its aim is to be (1) independent and non-partisan to ensure its credibility, (2) international to learn from experiences in other countries, a...

  18. Partial oxidation of toluene by O2 over mesoporous Cr/AlPO

    OpenAIRE

    Subrahmanyam, Ch; Louis, B.; Rainone, F.; Viswanathan, B.; Renken, A.; Varadarajan, T. K.

    2002-01-01

    The prepn. of mesoporous Cr/AlPO was carried out under hydrothermal conditions. The catalyst was characterized by low angle XRD, N-adsorption, diffuse reflectance UV-visible spectroscopy, ESR and thermal anal. The catalytic activity was tested for vapor phase partial oxidn. of toluene with O to benzaldehyde. The catalyst functions both as an acid and redox catalyst. [on SciFinder (R)

  19. Dissolved oxygen regimen (PO2 may affect osmorespiratory compromise in European sea bass (Dicentrarchus labrax, L.

    Directory of Open Access Journals (Sweden)

    Genciana Terova

    2010-02-01

    Full Text Available Fundamentally, in land based mediterranean aquaculture, two techniques are applied to supply water with oxygen: paddling water aeration and application of pure oxygen. The two oxygenation techniques result in quite different PO2 regimens and, consequently, different fish growth performance and gill morphology. Data exist showing a reduction in total respiratory surface (RSA and increasing gas diffusion distance (GDD in gills of sea bass (Dicentrarchus labrax, L. farmed under elevated PO2 regimens. That such a modification might have an effect on the ion regulation has been defined elsewhere as osmorespiratory compromise. In this study, European sea bass previously acclimatized to two PO2 regimens, mild hypoxia and mild hyperoxia (70-80% and 130-140% of the saturation value, respectively, were challenged for 1 hour with hypo-osmotic plus manipulation stress in two separate trials. During the first trial, when only Na+ loss was determined, the ion efflux during the first 5 min resulted in a rate of 163.72±31 and 112.23±87 nmol g-1min-1 from hypoxia and hyperoxia sea bass groups, respectively, and, if sustained, would approach 15.3 and 11.2% per hour of the total body Na+, respectively. During the second trial, in which both Na+ and Cl- loss were determined, after 60 min the Na+ loss was shown to be 76.86±12 and 179.28±32 nmol g-1 min-1 for the fish previously acclimatized to hyperoxia and hypoxia regimens, respectively, whereas for Cl- this loss was 62.02±11 and 157.28±28 nmol g-1min-1, respectively. Our data are compatible with the hypothesis of an osmotic advantage of sea bass exposed to an elevated PO2 regimen, achievable with application of pure oxygen, instead of simple water aeration.

  20. Enhancement of Electrical Conductivity of LiFePO4 by Controlled Solution Combustion Synthesis

    Science.gov (United States)

    Rajoba, S. J.; Jadhav, L. D.; Patil, P. S.; Tyagi, D. K.; Varma, S.; Wani, B. N.

    2017-03-01

    LiFePO4 has been synthesized by a solution combustion method at different oxidant-to-fuel ratios. At stoichiometric oxidant-to-fuel ratio (1:2), Fe2O3 formed in addition to LiFePO4 during combustion. Hence, reducing atmosphere was generated by increasing the ratio from stoichiometric to 1:4 and 1:8, named as 1-LFP, 2-LFP, and 4-LFP, respectively. Furthermore, as-prepared powders were calcined in inert atmosphere to avoid oxidation of LiFePO4 to Fe2O3 and Li3PO4, as confirmed by x-ray diffraction (XRD) and thermogravimetric and differential thermal analyses. The calcined powders were characterized by XRD analysis, Raman spectroscopy, scanning electron microscopy, and energy-dispersive x-ray spectroscopy. X-ray photoelectron spectroscopy ascertained oxidation state of +2 and +5 for Fe and P, respectively. With increasing oxidant-to-fuel ratio, the binding energies of 2 p 3/2 and 2 p 1/2 levels of Fe shifted downwards and showed increased splitting. According to Raman spectroscopy results, the residual carbon is amorphous with sp 2 C-C bond. The conductivity of 1-LFP, 2-LFP, and 4-LFP measured at 313 K was 0.15 × 10-6 S/cm, 8.46 × 10-6 S/cm, and 1.21 × 10-3 S/cm, respectively. The enhanced conductivity of 4-LFP is due to presence of residual carbon and Fe2P.

  1. Methyl-phospho-nic acid, CH3PO(OH)2.

    Science.gov (United States)

    Reuter, Hans; Reichelt, Martin

    2014-03-01

    The asymmetric unit of the title compound, CH5O3P, contains two independent mol-ecules with nearly identical bond lengths and angles. In the crystal, each of the mol-ecules acts as acceptor (P=O) and donor (P-OH) of four hydrogen bonds to three adjacent mol-ecules, resulting in the formation of two different bilayers (one for each mol-ecule) stacked perpendicular to the a axis in the crystal.

  2. Preparation and electrochemical properties of LiFePO 4/C ...

    Indian Academy of Sciences (India)

    A network structure, LiFePO4/C composite, was obtained using phenolic resin as carbon source. It possessed the highest specific surface area of 115.65 m2/g, exhibited the highest discharge capacity of 164.89 and 149.12 mAh/g at 0.1 C and 1 C rates, respectively. The discharge capacity was completely recovered when ...

  3. Nurturing The STEM Pipeline: Graduate Student Leadership In NIRCam's Ongoing E/PO Mission For JWST

    Science.gov (United States)

    Schlingman, Wayne M.; Stock, N.; Teske, J.; Tyler, K.; Biller, B.; Donley, J.; Hedden, A.; Knierman, K.; Young, P.

    2011-01-01

    The Astronomy Camp for Girl Scout Leaders is an education and public outreach (E/PO) program offered by the science team of the Near-InfraRed Camera (NIRCam) for NASA's 6.5-meter James Webb Space Telescope (JWST). Since 2003, astronomy graduate students have helped design and lead biannual "Train the Trainer” workshops for adults from the Girl Scouts of the USA (GSUSA), engaging these trainers in the process of scientific inquiry and equipping them to host astronomy-related activities at the troop level. These workshops have helped revise the national GSUSA badge curriculum and directly benefitted thousands of young girls of all ages, not only in general science and math education but also in specific astronomical and technological concepts relating to JWST. To date, nine graduate students have become members of NIRCam's E/PO team. They have developed curriculum and activities used to teach concepts in stellar nucleosynthesis, lookback time, galaxy classification, etc. They have also contributed to the overall strategic approach and helped lead more general activities in basic astronomy (night sky, phases of the Moon, the scale of the Solar System and beyond, stars, galaxies, telescopes, etc.) as well as JWST-specific research areas in extrasolar planetary systems and cosmology, to pave the way for girls and women to understand the first images from JWST. The resulting experience has empowered these students to propose and to develop their own E/PO programs after graduation as postdocs and young faculty. They also continue as part of NIRCam's growing worldwide network of 160 trainers teaching young women essential STEM-related concepts using astronomy, the night sky environment, applied math, engineering, and critical thinking. NIRCam and its E/PO program are funded by NASA under contract NAS5-02105.

  4. Production optimization and expression of pectin releasing enzyme from Aspergillus oryzae PO.

    Science.gov (United States)

    Chen, Jia; Yang, Rujian; Chen, Min; Wang, Shaohua; Li, Peng; Xia, Yuelan; Zhou, Li; Xie, Jingli; Wei, Dongzhi

    2014-01-30

    Protopectinase is an enzyme that solubilizes protopectin forming highly polymerized soluble pectin. Protopectinase activity was detected from Aspergillus oryzae PO isolated from soil of persimmon orchard. Response surface methodology of Box-Behnken Design with three fermentation variables (temperature, NaNO3 and apple pomace concentration) was used to optimize protopectinase production of A. oryzae PO, and protopectinase activity was improved to 270.0 U/ml. Endo-polygalacturonase belonged to A-type PPase from A. oryzae PO was cloned and expressed in Pichia pastoris GS115. The endo-polygalacturonase expression was 0.418 mg/ml and the specific activity of purified recombinant endo-polygalacturonase was 7520 U/mg toward polygalacturonic acid. The optimal temperature and pH of recombinant endo-polygalacturonase were 45°C and 5.0, respectively. The recombinant endo-polygalacturonase activity was enhanced by the presence of Mg(2+), while Ca(2+), Ni(2+) Mn(2+), Cu(2+) and SDS strongly inhibited the enzyme activity. The apparent Km value and Vmax value were 5.59 mg/ml and 1.01 μmol/(minml), respectively. Copyright © 2013. Published by Elsevier Ltd.

  5. Grupas “Agata Kristi” un grupas "Nirvana" roka poēzija.

    OpenAIRE

    Junga, Karīna

    2013-01-01

    Darbs veltīts roka poēzijas pētīšanai. Tajā tiek izskatīta Gļeba Samoilova («Agata Kristi») un Kurta Kobeina («Nirvana») roka poēzija. Autora mērķis ir identificēt un salīdzināt raksturīgās īpatnības grupu «Agata Kristi» un «Nirvana» daiļradē, kā arī izskatīt šo grupu dziesmu tekstus roka poēzijas tradīciju kontekstā.Kā darba materiāls tiek izmatoti grupas «Agata Kristi» albuma «Opium» un grupas «Nirvana» albuma «Nevermind» dziesmu teksti. Dotajā pētījumā autors nonāk pie secinājuma, ka...

  6. Two-photon microscopy measurement of CMRO2 using periarteriolar PO2 gradients(Conference Presentation)

    Science.gov (United States)

    Sakadžić, Sava; Yaseen, Mohammad A.; Jaswal, Rajeshwer S.; Roussakis, Emmanuel; Dale, Anders M.; Buxton, Richard B.; Vinogradov, Sergei A.; Boas, David A.; Devor, Anna

    2017-02-01

    The cerebral metabolic rate of oxygen (CMRO2) is an essential parameter for evaluating brain function and pathophysiology. Measurements of CMRO2 with high spatio-temporal resolution are critically important for understanding how the brain copes with metabolic and blood perfusion changes associated with various clinical conditions, such as stroke, periinfarct depolarizations, and various microvasculopathies (e.g., Alzheimer's disease, chronic hypertension). CMRO2 measurements are also important for understanding the physiological underpinnings of functional Magnetic Resonance Imaging signals. However, the currently available approaches for quantifying CMRO2 rely on complex multimodal imaging and mathematical modeling. Here, we introduce a novel method that allows estimation of CMRO2 based on a single measurement modality - two-photon phosphorescence lifetime microscopy (2PLM) imaging of the partial pressure of oxygen (PO2) in cortical tissue. CMRO2 is estimated by fitting the changes of tissue PO2 around cortical penetrating arterioles with the Krogh cylinder model of oxygen diffusion. We measured the baseline CMRO2 in anesthetized rats, and modulated tissue PO2 levels by manipulating the depth of anesthesia. This method has a spatial resolution of approximately 200 μm and it may provide CMRO2 measurements in individual cortical layers or within confined cortical regions such as in ischemic penumbra and the foci of functional activation.

  7. Excitation Induced Tunable Emission in Ce3+/Eu3+ Codoped BiPO4 Nanophosphors

    Directory of Open Access Journals (Sweden)

    Sarabjot Singh

    2015-01-01

    Full Text Available Ce3+, Eu3+ ions singly doped, and Ce3+/Eu3+ codoped bismuth phosphate (BiPO4 nanophosphors were synthesized by a simple precipitation method and their structural, morphological, and photoluminescence properties were investigated. The structural and morphological analysis confirms the pure hexagonal crystal structure of the synthesized nanophosphors. From the Fourier transform infrared (FTIR spectra various absorption bands respective to functional groups such as PO4 and phonon vibrations including the bending modes of the PO4 units are identified. The Ce3+ doped nanophosphors show spectrally broad luminescence in the blue (centred at 459 nm wavelength region under the direct optical excitation of Ce3+ at 417 nm. For Eu3+ doped nanophosphors, five emission bands have been observed with 394 nm excitation wavelength. Among them, 595 nm has shown bright yellowish-orange emission. These results demonstrate that by appropriately tuning the excitation wavelength of these codoped nanophosphors the emission color in the visible region (blue and orange can be flexibly controlled in a single sample without varying its chemical composition and size. The mechanism for this excitation energy dependent tunable emission is explained on the basis of nonenergy transfer (ET occurring among Ce3+/Eu3+ dopant ions.

  8. Krāsas un atmosfēra Edgara Alana Po dzejā

    OpenAIRE

    Kļimova, Kristīna

    2009-01-01

    Bakalaura darba tēma ir krāsas un noskaņa Edgar Allana Po dzejā. Pētījuma uzdevums ir noteikt biežāk lietojamos tēlainās izteiksmes līdzekļus un krāsas Edgara Po dzejā, turklāt identificēt gaisotni un noskaņu šajos darbos. Darba autore ir veikusi pētījumu balstoties uz praktiskām un teorētiskām zināšanām. Teorētiskā daļa iztirzā tāda veida problēmas kā: tēlainās izteiksmes līdzekļu būtību, simbolu un simbolsisko krāsu izmantošana literatūrā, ka arī to nozīmi Edgara Allana Po dzejā, un cit...

  9. First-principles study of point defects in CePO{sub 4} monazite

    Energy Technology Data Exchange (ETDEWEB)

    Yi, Yong; Zhao, Xiaofeng [State Key Laboratory Cultivation Base for Nonmetal Composites and Functional Materials, Southwest University of Science and Technology, Mianyang 621010 (China); Teng, Yuancheng, E-mail: tyc239@163.com [State Key Laboratory Cultivation Base for Nonmetal Composites and Functional Materials, Southwest University of Science and Technology, Mianyang 621010 (China); Bi, Beng [Joint Laboratory for Extreme Conditions Matter Properties, Southwest University of Science and Technology, Mianyang 621010 (China); Wang, Lili [Institute of Computer Application, China Academy of Engineering Physics, Mianyang 621900 (China); Wu, Lang; Zhang, Kuibao [State Key Laboratory Cultivation Base for Nonmetal Composites and Functional Materials, Southwest University of Science and Technology, Mianyang 621010 (China)

    2016-12-15

    CePO{sub 4} monazite is an important radiation-resistant material that may act as a potential minor actinides waste form. Here, we present the results of the calculations for the basic radiation defect modellings in CePO{sub 4} crystals, along with the examination of their defect formation energies and effect of the defect concentrations. This study focused on building a fully-relaxed CePO{sub 4} model with the step iterative optimization from the DFT-GGA calculations using the VASP and CASTEP databases. The results show that the Frenkel defect configuration resulting from the center interstitials has a lower energy when compared to two adjacent orthophosphate centers (the saddle point position). High formation energies were found for all the types of intrinsic Frenkel and vacancy defects. The formation energies conform to the following trend (given in the decreasing order of energy): Ce Frenkel (12.41 eV) > O Frenkel (11.02 eV) > Ce vacancy (9.09 eV) > O vacancy (6.69 eV). We observed almost no effect from the defect concentrations on the defect formation energies.

  10. Las palabras ciegas: acercamiento a la poética de Antonio Gamoneda

    Directory of Open Access Journals (Sweden)

    María Pérez Heredia

    2017-08-01

    Full Text Available En este artículo se plantea la búsqueda de la poética de Antonio Gamoneda. Se trata de una poética que parte del dolor para buscar la luz, siempre centrándose en la reflexión metaliteraria. El poeta aprende a mirarse a sí mismo, en versos puramente introspectivos, para poder así mirar el mundo. Para exponer el hecho de que la lirica gamonediana es en sí misma metaliteraria, se parte del análisis de diversos poemas, que abarcan la mayor parte de la trayectoria poética del poeta. El silencio como elemento previo a la creación, expresado en la página en blanco, será fundamental, así como el hecho de nombrar, de dar nombre a las cosas. Gamoneda, a través de la contemplación de la adquisición del habla de su nieta Cecilia, explorará el poder creador de la palabra.

  11. Study of Li atom diffusion in amorphous Li3PO4 with neural network potential

    Science.gov (United States)

    Li, Wenwen; Ando, Yasunobu; Minamitani, Emi; Watanabe, Satoshi

    2017-12-01

    To clarify atomic diffusion in amorphous materials, which is important in novel information and energy devices, theoretical methods having both reliability and computational speed are eagerly anticipated. In the present study, we applied neural network (NN) potentials, a recently developed machine learning technique, to the study of atom diffusion in amorphous materials, using Li3PO4 as a benchmark material. The NN potential was used together with the nudged elastic band, kinetic Monte Carlo, and molecular dynamics methods to characterize Li vacancy diffusion behavior in the amorphous Li3PO4 model. By comparing these results with corresponding DFT calculations, we found that the average error of the NN potential is 0.048 eV in calculating energy barriers of diffusion paths, and 0.041 eV in diffusion activation energy. Moreover, the diffusion coefficients obtained from molecular dynamics are always consistent with those from ab initio molecular dynamics simulation, while the computation speed of the NN potential is 3-4 orders of magnitude faster than DFT. Lastly, the structure of amorphous Li3PO4 and the ion transport properties in it were studied with the NN potential using a large supercell model containing more than 1000 atoms. The formation of P2O7 units was observed, which is consistent with the experimental characterization. The Li diffusion activation energy was estimated to be 0.55 eV, which agrees well with the experimental measurements.

  12. Vibrational spectroscopic and dielectric properties investigations of phase transitions in KMgPO4 compound

    Science.gov (United States)

    Miladi, L.; Oueslati, A.; Guidara, K.

    2017-11-01

    The potassium orthophosphate KMgPO4 with a β-tridymite structure was synthesized via solid-state reaction. X-ray diffraction study confirms the formation of a single phase material which crystallizes at room temperature in monoclinic system. This compound has been investigated by vibrational spectroscopy in the temperature range573-723 K. Thermal analysis shows that this composition undergoes two phase transitions at T1=633Kand T2=693 K.The evolution of Raman line ν and half -width Δν versus temperature introduces huge changes which are associated with the phase transitions originating from the reorientation of the PO4 tetrahedron. Besides, an analysis of the dielectric constants ε‧ and ε″versus temperature at several frequencies shows a distribution of relaxation times. This relaxation is probably due to the change in dynamical state of the K+ cation. The ac conductivity behavior can be understood in terms of the motions of K+ cations along the tunnels which are formed by six-membered rings of MgO4 and PO4 tetrahedron linked by common vertices. The activation energies values obtained from the thermal evolution of the conductivity are: Ea1=0.52 eV (T693 K).

  13. Structure and spectroscopic properties of (Y, Eu)(PO3)3 polyphosphate red phosphors

    Science.gov (United States)

    Zhang, Xinguo; Chen, Peican; Wang, Zizhou; Zhou, Liya; Zhou, Fangxiang

    2016-08-01

    A series of orange-red emitting phosphor Y(PO3)3: xEu3+ (x = 0.1-1.0) was prepared by a solid-state reaction route. The phosphors were characterized by X-ray diffraction (XRD) and photoluminescence (PL) as well as decay lifetimes. Studies revealed the phase transfer from monoclinic to orthorhombic when Y3+ is totally replaced by Eu3+, and expansion of the unit cell occurs with increasing Eu3+ doped content. The PL spectra show that the phosphors Y(PO3)3: xEu3+ can be effectively excited by near ultraviolet (n-UV) light, and exhibit strong red-orange emission with no concentration quenching. The profile of PL spectra changes significantly at high Eu3+ content (x ≥ 0.80), which is due to the variation of preference for substitution of Eu3+. The luminescence due to the 5D0 → 7FJ (J = 1, 2) transitions at 77 K exhibits its own spectral features for different crystallographic site. It is found that Eu3+ ions occupy the centers of octahedral polyhedron and form Ci/C1 point group in Y(PO3)3.

  14. Factors Influencing the Quality of Carbon Coatings onLiFePO4

    Energy Technology Data Exchange (ETDEWEB)

    Wilcox, James D.; Doeff, Marca M.; Marcinek, Marek; Kostecki,Robert

    2006-10-11

    Several LiFePO4/C composites were prepared and characterizedelectrochemically in lithium half-cells. Pressed pellet conductivitiescorrelated well with the electrochemical performance in lithiumhalf-cells. It was found that carbon structural factors such as sp2/sp3,D/G, and H/C ratios, as determined by Raman spectroscopy and elementalanalysis, influenced the conductivity and rate behavior strongly. Thestructure of the residual carbon could be manipulated through the use ofadditives during LiFePO4 synthesis. Increasing the pyromellitic acid (PA)content in the precursor mix prior to calcination resulted in asignificant lowering of the D/G ratio and a concomitant rise in thesp2/sp3 ratio of the carbon. Addition of both iron nitrate and PAresulted in higher sp2/sp3 ratios without further lowering the D/Gratios, or increasing carbon contents. The best electrochemical resultswere obtained for LiFePO4 processed with both ferrocene and PA. Theimprovement is attributed to better decomposition of the carbon sources,as evidenced by lower H/C ratios, a slight increase of the carbon content(still below 2 wt. percent), and more homogeneous coverage. A discussionof the influence of carbon content vs. structural factors on thecomposite conductivities and, by inference, the electrochemicalperformance, is included.

  15. Determination of 210Po concentration in commercially available infant formulae and assessment of daily ingestion dose

    Directory of Open Access Journals (Sweden)

    Ravi K. Prabhath

    2015-07-01

    Full Text Available A study has been conducted to estimate the concentration of natural radioactive polonium in commercially available packaged infant food formulae available in Mumbai, India and the corresponding daily dose normalized based on its shelf life. Eleven most popular international brands of infant formulae were sourced from market and three aliquots from each sample were analysed for concordant results. Autodeposition method onto a silver planchet from hot dilute acid solution followed by alpha spectrometry was performed for estimation of polonium. Radiochemical recovery was ascertained by the addition of 209Po tracer. Radiochemical recovery of 209Po tracer was ranged from 14.7 to 98.1 %. The 210Po concentration in the samples was in the range of 0.08–0.23 Bq kg−1 on measured date and the corresponding daily dose, calculated on normalized date which is at mid-point of the shelf life of the sample, was ranged from 0.04 to 0.89 μSv d−1 as per the recommended daily consumption. The annual committed effective dose estimated based on the average of daily dose was found to be 150 μSv.

  16. Incorporation of Ln-Doped LaPO4 Nanocrystals as Luminescent Markers in Silica Nanoparticles.

    Science.gov (United States)

    van Hest, Jacobine J H A; Blab, Gerhard A; Gerritsen, Hans C; Donega, Celso de Mello; Meijerink, Andries

    2016-12-01

    Lanthanide ions are promising for the labeling of silica nanoparticles with a specific luminescent fingerprint due to their sharp line emission at characteristic wavelengths. With the increasing use of silica nanoparticles in consumer products, it is important to label silica nanoparticles in order to trace the biodistribution, both in the environment and living organisms.In this work, we synthesized LaPO4 nanocrystals (NCs) with sizes ranging from 4 to 8 nm doped with europium or cerium and terbium. After silica growth using an inverse micelle method, monodisperse silica spheres were obtained with a single LaPO4 NC in the center. We demonstrate that the size of the silica spheres can be tuned in the 25-55 nm range by addition of small volumes of methanol during the silica growth reaction. Both the LaPO4 core and silica nanocrystal showed sharp line emission characteristic for europium and terbium providing unique optical labels in silica nanoparticles of variable sizes.

  17. Robertsite, Ca2MnIII3O2(PO43·3H2O

    Directory of Open Access Journals (Sweden)

    Marcelo B. Andrade

    2012-10-01

    Full Text Available Robertsite, ideally Ca2Mn3O2(PO43·3H2O [calcium manganese(III tris(orthophosphate trihydrate], can be associated with the arseniosiderite structural group characterized by the general formula Ca2A3O2(TO43·nH2O, with A = Fe, Mn; T = As, P; and n = 2 or 3. In this study, single-crystal X-ray diffraction data were used to determine the robertsite structure from a twinned crystal from the type locality, the Tip Top mine, Custer County, South Dakota, USA, and to refine anisotropic displacement parameters for all atoms. The general structural feature of robertsite resembles that of the other two members of the arseniosiderite group, the structures of which have previously been reported. It is characterized by sheets of [MnO6] octahedra in the form of nine-membered pseudo-trigonal rings. Located at the center of each nine-membered ring is a PO4 tetrahedron, and the other eight PO4 tetrahedra sandwich the Mn–oxide sheets. The six different Ca2+ ions are seven-coordinated in form of distorted pentagonal bipyramids, [CaO5(H2O2], if Ca—O distances less than 2.85 Å are considered. Along with hydrogen bonding involving the water molecules, they hold the manganese–phosphate sheets together. All nine [MnO6] octahedra are distorted by the Jahn–Teller effect.

  18. ALTERNATIVE REMEDIATION TECHNOLOGY STUDY FOR GROUNDWATER TREATMENT AT 200-PO-1 OPERABLE UNIT AT HANFORD SITE

    Energy Technology Data Exchange (ETDEWEB)

    DADO MA

    2008-07-31

    This study focuses on the remediation methods and technologies applicable for use at 200-PO-I Groundwater Operable Unit (OU) at the Hanford Site. The 200-PO-I Groundwater au requires groundwater remediation because of the existence of contaminants of potential concern (COPC). A screening was conducted on alternative technologies and methods of remediation to determine which show the most potential for remediation of groundwater contaminants. The possible technologies were screened to determine which would be suggested for further study and which were not applicable for groundwater remediation. COPCs determined by the Hanford Site groundwater monitoring were grouped into categories based on properties linking them by remediation methods applicable to each COPC group. The screening considered the following criteria. (1) Determine if the suggested method or technology can be used for the specific contaminants found in groundwater and if the technology can be applied at the 200-PO-I Groundwater au, based on physical characteristics such as geology and depth to groundwater. (2) Evaluate screened technologies based on testing and development stages, effectiveness, implementability, cost, and time. This report documents the results of an intern research project conducted by Mathew Dado for Central Plateau Remediation in the Soil and Groundwater Remediation Project. The study was conducted under the technical supervision of Gloria Cummins and management supervision of Theresa Bergman and Becky Austin.

  19. The SDO Education and Outreach (E/PO) Program: Changing Perceptions One Program at a Time

    Science.gov (United States)

    Drobnes, E.; Littleton, A.; Pesnell, W. D.; Buhr, S.; Beck, K.; Durscher, R.; Hill, S.; McCaffrey, M.; McKenzie, D. E.; Myers, D.; hide

    2011-01-01

    The Solar Dynamics Observatory (SDO) Education and Public Outreach (E/PO) program began as a series of discrete efforts implemented by each of the instrument teams and has evolved into a well-rounded program with a full suite of national and international programs. The SDO E/PO team has put forth much effort in the past few years to increase our cohesiveness by adopting common goals and increasing the amount of overlap between our programs. In this paper, we outline the context and overall philosophy for our combined programs, present a brief overview of all SDO E/PO programs along with more detailed highlight of a few key programs, followed by a review of our results up to date. Concluding is a summary of the successes, failures, and lessons learned that future missions can use as a guide, while further incorporating their own content to enhance the public's knowledge and appreciation of NASA?s science and technology as well as its benefit to society.

  20. Pengaruh Metode Thawing terhadap Kualitas Semen Beku Sapi Bali, Sapi Madura dan Sapi PO

    Directory of Open Access Journals (Sweden)

    Muhammad Ade Salim

    2012-10-01

    Full Text Available Effect of thawing technique to quality frozen semen spermatozoa in bali, madura and PO cattle ABSTRACT. The experiment was conducted from November 2011 to January 2012 in BBIB Singosari. The study aims was to determine the effect of thawing techniques on the quality frozen bovine sperm Bali, Madura and PO cattle. This material used 90 frozen straw of three cattle from the three breed. The method is an experiment with three treatments and 10 replications for frozen to thawing in temperature water is 5 0C of duration 60 seconds, 15 0C duration 30 seconds and 37 0C duration 15 seconds. Variables observed in this study were sperm quality are motility, viability and abnormality. Data in percentage transformed in to arcus sinus were analyzed using Completely Randomized Block Design (CRBD with replication as blocks of 10x. The results showed the thawing at 37 0C duration 15 seconds to highly significant effect (P0,05. Breed cattle not significant effect to quality. It can be concluded that thawing techniques impact the motility and viability in frozen bovine semen spermatozoa Bali, Madura and PO cattle. Thawing using 37 0C temperature water with duration of 15 seconds is the best method to obtain the quality of spermatozoa post thawing frozen sperm.

  1. The Legacy of NASA Astrophysics E/PO: Scientist Engagement and Higher Education

    Science.gov (United States)

    Manning, Jim; Smith, Denise A.; Meinke, Bonnie; Lawton, Brandon; Schulz, Gregory; Bartolone, Lindsay; Bianchi, Luciana; NASA SMD Astrophysics E/PO Community

    2016-01-01

    For the past six years, NASA's Science Mission Directorate has coordinated the work of its mission- and program-embedded education and public outreach (E/PO) efforts through four forums representing its four science divisions. The Astrophysics forum, as the others, has built on the long-standing mission E/PO 1% allocation and embedded scientist/educator partnerships to encourage and coordinate collaborative efforts to make the most efficient and effective use of NASA resources, personnel, data and discoveries in leveraged ways, in support of the nation's science education. Two of the priorities established early in the forum's period of activity were to enhance scientist engagement in E/PO and to coordinate the community in providing useful higher education resources based on determined needs. This presentation will highlight some of the achievements for these two priorities over the past six years, how the products and efforts are being preserved, and how they can continue to be accessed as NASA SMD transitions to a new Education and Communication landscape. The work constitutes an ongoing legacy--a firm foundation on which the new structure of NASA SMD Education efforts will go forward.

  2. Spatial variability of δ18O-PO4 in soils.

    Science.gov (United States)

    Granger, Steve; Blackwell, Martin; Tamburini, Federica; Guo, Rongrong; Peukert, Sabine; McGrath, Steve

    2014-05-01

    There is growing interest in the potential for using the δ18OPO4 values of different phosphate sources in the environment to enable identification of sources of phosphate in surface waters. The basis of the study is the belief that different sources of PO4 may have different δ18O values. One of the primary sources of PO4 in runoff from agricultural land is the soil itself. Therefore, in order to account for the PO4 derived from soils in surface waters, it is vital that the degree of spatial variability of its δ18O isotopic values are known, in order that suitable soil sampling approaches can be taken when assessing the soil as a source in future studies. A spatial study of the variability of the δ18OPO4 variability of soils collected from a grazed pasture on the North Wyke Farm Platform was carried out incorporating grid-sampling at a range of spatial scales. Results show that variability across a range of scales is minimal, meaning that, in this case, a relatively small number of samples would be required in order to identify accurately the mean δ18OPO4 value of the soil. This study represents an important contribution towards the methodological development studies required in this field of research in order that the full potential of the δ18OPO4 technique for biological and environmental research can be achieved.

  3. Esquizofrenia y poesía. El acto poético como reversa del estigma

    Directory of Open Access Journals (Sweden)

    Alicia Figueroa

    2017-11-01

    Full Text Available En el presente estudio se analiza la relación activa entre personas con esquizofrenia y la creación poética a fin de cuestionar los estereotipos subyacentes entre la actividad creativa y la esquizofrenia. Existe una larga tradición que concibe la producción artística en la esquizofrenia como fragmentaria, críptica e inaccesible o que afirma que las habilidades artísticas y creativas de estas personas constituyen procesos filtrados por los mecanismos disfuncionales de la patología. Considerando, en este artículo, la producción literaria de Javier Fueyo, poeta chileno que padece esquizofrenia, se desea demostrar precisamente que su obra no responde a las concepciones y estereotipos tradicionales, sino que constituye un claro modelo de creación poética operado racionalmente y que no se explica por su condición personal sino por sus habilidades poéticas.

  4. Can Vanadium Be Substituted into LiFePO[subscript 4]?

    Energy Technology Data Exchange (ETDEWEB)

    Omenya, Fredrick; Chernova, Natasha A.; Upreti, Shailesh; Zavalij, Peter Y.; Nam, Kyung-Wan; Yang, Xiao-Qing; Whittingham, M. Stanley (Binghamton); (BNL); (Maryland)

    2015-10-15

    Vanadium is shown to substitute for iron in the olivine LiFePO{sub 4} up to at least 10 mol %, when the synthesis is carried out at 550 C. In the solid solution LiFe{sub 1-3y/2}V{sub y}PO{sub 4}, the a and b lattice parameters and cell volume decrease with increasing vanadium content, while the c lattice parameter increases slightly. However, when the synthesis is performed at 650 C, a NASICON phase, Li{sub 3}V{sub 2}(PO{sub 4}){sub 3}, is also formed, showing that solid solution is a function of the synthesis temperature. X-ray absorption near-edge structure indicates vanadium is in the 3+ oxidation state and in an octahedral environment. Magnetic studies reveal a shift of the antiferromagnetic ordering transition toward lower temperatures with increasing vanadium substitution, confirming solid solution formation. The addition of vanadium enhances the electrochemical performance of the materials especially at high current densities.

  5. Repensando la competencia poética en la enseñanza del inglés en edad temprana: una práctica de lingüística poética

    Directory of Open Access Journals (Sweden)

    Antonio Garcés-Rodríguez

    2017-01-01

    Full Text Available Es objeto de nuestro estudio, de carácter interpretativo, partir de una revisión teórica del concepto de competencia poética lingüística (CPL y conducirnos a un análisis observacional cuantitativo que exponga los resultados obtenidos respecto a la lectura poética y las actividades relacionadas con el acto de lectura de textos poéticos en las aulas de primaria de EFL. Pretendemos con el análisis y exposición de datos reflejar la situación actual de esa CPL en las aulas de Segunda Lengua (L2 en primaria y señalar una prospectiva de investigación sobre las condiciones metodológicas en relación con la lectura y escritura para lograr una verdadera competencia comunicativa, funcional, expresiva y creativa y poética.

  6. Role of nitric oxide of the median preoptic nucleus (MnPO in the alterations of salivary flow, arterial pressure and heart rate induced by injection of pilocarpine into the MnPO and intraperitoneally

    Directory of Open Access Journals (Sweden)

    Wilson A. Saad

    2003-07-01

    Full Text Available We investigated the effect of L-NAME, a nitric oxide (NO inhibitor and sodium nitroprusside (SNP, an NO-donating agent, on pilocarpine-induced alterations in salivary flow, mean arterial blood pressure (MAP and heart rate (HR in rats. Male Holtzman rats (250-300 g were implanted with a stainless steel cannula directly into the median preoptic nucleus (MnPO. Pilocarpine (10, 20, 40, 80, 160 µg injected into the MnPO induced an increase in salivary secretion (P<0.01. Pilocarpine (1, 2, 4, 8, 16 mg/kg ip also increased salivary secretion (P<0.01. Injection of L-NAME (40 µg into the MnPO prior to pilocarpine (10, 20, 40, 80, 160 µg injected into the MnPO or ip (1, 2, 4, 8, 16 mg/kg increased salivary secretion (P<0.01. SNP (30 µg injected into the MnPO or ip prior to pilocarpine attenuated salivary secretion (P<0.01. Pilocarpine (40 µg injection into the MnPO increased MAP and decreased HR (P<0.01. Pilocarpine (4 mg/kg body weight ip produced a decrease in MAP and an increase in HR (P<0.01. Injection of L-NAME (40 µg into the MnPO prior to pilocarpine potentiated the increase in MAP and reduced HR (P<0.01. SNP (30 µg injected into the MnPO prior to pilocarpine attenuated (100% the effect of pilocarpine on MAP, with no effect on HR. Administration of L-NAME (40 µg into the MnPO potentiated the effect of pilocarpine injected ip. SNP (30 µg injected into the MnPO attenuated the effect of ip pilocarpine on MAP and HR. The present study suggests that in the rat MnPO 1 NO is important for the effects of pilocarpine on salivary flow, and 2 pilocarpine interferes with blood pressure and HR (side effects of pilocarpine, that is attenuated by NO.

  7. Environmental changes in the central Po Plain (northern Italy) due to fluvial modifications and anthropogenic activities

    Science.gov (United States)

    Marchetti, Mauro

    2002-05-01

    The fluvial environment of the central Po Plain, the largest plain in Italy, is discussed in this paper. Bounded by the mountain chains of the Alps and the Apennines, this plain is a link between the Mediterranean environment and the cultural and continental influences of both western and eastern Europe. In the past decades, economic development has been responsible for many changes in the fluvial environment of the area. This paper discusses the changes in fluvial dynamics that started from Late Pleistocene and Early Holocene due to distinct climatic changes. The discussion is based on geomorphological, pedological, and archaeological evidences and radiocarbon dating. In the northern foothills, Late Pleistocene palaeochannels indicate several cases of underfit streams among the northern tributaries of the River Po. On the other hand, on the southern side of the Po Plain, no geomorphological evidence of similar discharge reduction has been found. Here, stratigraphic sections, together with archaeological remains buried under the fluvial deposits, show a reduction in the size of fluvial sediments after the 10th millennium BC. During the Holocene, fluvial sedimentation became finer, and was characterised by minor fluctuations in the rate of deposition, probably related to short and less intense climatic fluctuations. Given the high rate of population growth and the development of human activities since the Neolithic Age, human influence on fluvial dynamics, especially since the Roman Age, prevailed over other factors (i.e., climate, tectonics, vegetation, etc.). During the Holocene, the most important changes in the Po Plain were not modifications in water discharge but in sediment. From the 1st to 3rd Century AD, land grants to war veterans caused almost complete deforestation, generalised soil erosion, and maximum progradation of the River Po delta. At present, land abandonment in the mountainous region has led to reafforestation. Artificial channel control in the

  8. Highly-efficient photocatalytic degradation of methylene blue by PoPD-modified TiO2nanocomposites due to photosensitization-synergetic effect of TiO2with PoPD.

    Science.gov (United States)

    Yang, Chuanxi; Dong, Wenping; Cui, Guanwei; Zhao, Yingqiang; Shi, Xifeng; Xia, Xinyuan; Tang, Bo; Wang, Weiliang

    2017-06-21

    Poly-o-phenylenediamine modified TiO 2 nanocomposites were successfully synthesized via an 'in situ' oxidative polymerization method. The modified nanocomposites were characterized by BET, XRD, TEM, FT-IR, TGA, XPS, EA and UV-Vis DRS. The photocatalytic degradation of methylene blue was chosen as a model reaction to evaluate the photocatalytic activities of TiO 2 and PoPD/TiO 2 . The results indicated that PoPD/TiO 2 nanocomposites exhibited good photocatalytic activity and stability. The photocatalytic activity of PoPD/TiO 2 increased as the initial pH increased because of electrostatic adsorption between the photocatalyst and MB as well as the generation of ·OH, whereas it exhibited an earlier increasing and later decreasing trend as the concentration of the photocatalyst increased owing to the absorption of visible light. The photocatalytic stability of the PoPD/TiO 2 nanocomposite was dependent on the stability of its structure. Based on radical trapping experiments and ESR measurements, the origin of oxidizing ability of PoPD/TiO 2 nanocomposites on photocatalytic degradation of MB was proposed, which taking into account of ·OH and ·O 2 - were the first and second important ROS, respectively. The possible photocatalytic mechanism and photocatalytic activity enhanced mechanism has been proposed, taking into account the photosensitization effect and synergetic effect of TiO 2 with PoPD.

  9. Poésie et iconicité : concrétisme et expérimentalisme dans la poésie espagnole contemporaine

    OpenAIRE

    Le Bigot, Claude

    2017-01-01

    Dans le sillage des avant-gardes littéraires des années 20, qui ont donné lieu en Espagne à une véritable floraison qu’on pourrait réunir sous le label du créationnisme, il se produit autour de 1968 un nouvel éveil contestataire qui affecte le domaine poétique que Ton désigne sous le terme d’expérimentalisme. Ce courant, animé principalement par des écrivains comme Fernando Millán, Joan Brossa, Francisco Pino, Ignacio Gómez de Liaño, José Miguel Ullán, a poussé dans ses ultimes retranchements...

  10. Synthesis and luminescent properties of uniform monodisperse LuPO4:Eu3+/Tb3+ hollow microspheres.

    Science.gov (United States)

    Gao, Yu; Yu, He; Shi, Cheng; Zhao, Guiyan; Bi, Yanfeng; Xu, Baotong; Ding, Fu; Sun, Yaguang; Xu, Zhenhe

    2017-12-01

    Uniform monodisperse LuPO4:Eu3+/Tb3+ hollow microspheres with diameters of about 2.4 µm have been successfully synthesized by the combination of a facile homogeneous precipitation approach, an ion-exchange process and a calcination process. The possible formation mechanism for the hollow microspheres was presented. Furthermore, the luminescence properties revealed that the LuPO4:Eu3+ and LuPO4:Tb3+ phosphors show strong orange-red and green emissions under ultraviolet excitation, respectively, which endows this material with potential application in many fields, such as light display systems and optoelectronic devices. Since the synthetic process can be carried out at mild conditions, it should be straightforward to scale up the entire process for large-scale production of the LuPO4 hollow microspheres. Furthermore, this general and simple method may be of much significance in the synthesis of many other inorganic materials.

  11. Quantification of longitudinal tissue pO2 gradients in window chamber tumours: impact on tumour hypoxia

    National Research Council Canada - National Science Library

    Dewhirst, M W; Ong, E T; Braun, R D; Smith, B; Klitzman, B; Evans, S M; Wilson, D

    1999-01-01

    We previously reported that the arteriolar input in window chamber tumours is limited in number and is constrained to enter the tumour from one surface, and that the pO2 of tumour arterioles is lower...

  12. Synthesis and luminescent properties of uniform monodisperse LuPO4:Eu3+/Tb3+ hollow microspheres

    Science.gov (United States)

    Gao, Yu; Yu, He; Shi, Cheng; Zhao, Guiyan; Bi, Yanfeng; Ding, Fu; Sun, Yaguang; Xu, Zhenhe

    2017-01-01

    Uniform monodisperse LuPO4:Eu3+/Tb3+ hollow microspheres with diameters of about 2.4 µm have been successfully synthesized by the combination of a facile homogeneous precipitation approach, an ion-exchange process and a calcination process. The possible formation mechanism for the hollow microspheres was presented. Furthermore, the luminescence properties revealed that the LuPO4:Eu3+ and LuPO4:Tb3+ phosphors show strong orange-red and green emissions under ultraviolet excitation, respectively, which endows this material with potential application in many fields, such as light display systems and optoelectronic devices. Since the synthetic process can be carried out at mild conditions, it should be straightforward to scale up the entire process for large-scale production of the LuPO4 hollow microspheres. Furthermore, this general and simple method may be of much significance in the synthesis of many other inorganic materials. PMID:29308268

  13. Structure determination, electronic and optical properties of rubidium holmium polyphosphate RbHo(PO3)4

    Science.gov (United States)

    Zhu, Jing; Chen, Hui; Wang, Yude; Guan, Hongtao; Xiao, Xuechun

    2012-12-01

    Structural, optical, and electronic properties of a new alkali metal-rare earth polyphosphate, RbHo(PO3)4, have been investigated by means of single-crystal X-ray diffraction, power X-ray diffraction, elemental analysis, and spectral measurement. RbHo(PO3)4 crystallizes in the monoclinic with space group P21/n and Z = 4. It is described as a three-dimensional (3D) architecture built up of PO4 double spiral chains and HoO8 polyhedra by corner-sharing. The 11-coordinated rubidium atoms are located in infinite tunnels. Additionally, in order to gain further insight into the relationship between property and structure of RbHo(PO3)4, theoretical calculation based on the density functional theory (DFT) was performed using the total-energy code CASTEP.

  14. Assessment of {sup 210}Po and {sup 210}Pb in marine biota of the Mallipattinam ecosystem of Tamil Nadu, India

    Energy Technology Data Exchange (ETDEWEB)

    Suriyanarayanan, S. [Center for Water and Health, JSS University, SS Nagara, Mysore 570 015, Karnataka (India); Brahmanandhan, G.M., E-mail: brahma_king@yahoo.co [Nagasaki University Radioisotope Research Center, Radio Isotope Center, 1-12-4, Sakamoto, Nagasaki 852-8523 (Japan); Samivel, K. [Environmental Research Lab, P.G. Department of Zoology, Jamal Mohamed College, Tiruchirappalli-620 020, Tamil Nadu (India); Ravikumar, S. [Faculty of Biotechnology, PRIST University, Thanjavur 613 403, Tamil Nadu (India); Hameed, P. Shahul [Environment Research Center, JJ College of Engineering and Technology, Tiruchirappalli 620 009, Tamil Nadu (India)

    2010-11-15

    To provide baseline data on background radiation levels for the future assessment of the impact of nuclear and thermal power stations, a systematic study was carried out in the Mallipattinam ecosystem of Tamil Nadu, India. Mallipattinam is located between the Kudankulam and Kalpakkam nuclear power plants and near to Tuticorin thermal power plant. Water, sediments, seaweeds, crustaceans, molluscs, and fish were collected to measure the concentrations of {sup 210}Po and {sup 210}Pb. The concentrations of {sup 210}Po and {sup 210}Pb in most samples are comparable to values reported worldwide. In fish, the concentrations of {sup 210}Po and {sup 210}Pb are in the range 16-190 Bq kg{sup -1} and 8-153 Bq kg{sup -1}, respectively. The concentration factors of {sup 210}Po and {sup 210}Pb for the biotic components ranges from 10{sup 3} to 10{sup 6}.

  15. A TEM study of morphological and structural degradation phenomena in LiFePO4-CB cathodes

    DEFF Research Database (Denmark)

    Ngo, Duc-The; Scipioni, Roberto; Simonsen, Søren Bredmose

    2016-01-01

    LiFePO4-based cathodes suffer from various degradation mechanisms, which influences the battery performance. In this paper, morphological and structural degradation phenomena in laboratory cathodes made of LiFePO4 mixed with carbon black (CB) in a 1 mol/L LiPF6 in EC : DMC (1:1 by weight) electro......LiFePO4-based cathodes suffer from various degradation mechanisms, which influences the battery performance. In this paper, morphological and structural degradation phenomena in laboratory cathodes made of LiFePO4 mixed with carbon black (CB) in a 1 mol/L LiPF6 in EC : DMC (1:1 by weight...

  16. Theoretical investigations of thermodynamic properties of partially deuterated K(H1-xDx2PO4 ferroelectrics

    Directory of Open Access Journals (Sweden)

    R.R.Levitskii

    2007-01-01

    Full Text Available The research of thermodynamic properties of partially deuterated K(H1-xDx2PO4 crystals was performed within the framework of proton ordering model with tunnelling within the four-particle cluster approximation for short-range interaction and within the molecular field approximation for long-range interaction. The KD2PO4's model parameters were derived for the case of acceptable description of the experimental data for crystal thermodynamic characteristics. Based on the introduced procedure of deriving parameters for K(H1-xDx2PO4 crystals, the thermodynamic and dielectric properties of these crystals were calculated and the results were compared with the experimental ones. The problem of applying the mean crystal approximation to the analysis of physical characteristics of K(H1-xDx2PO4 crystals was discussed.

  17. Higher Order Geometrical Modeling and Higher Order Field/Current Modeling in FEM, MoM, and PO Simulations

    National Research Council Canada - National Science Library

    Notaros, Branislav M; Ilic, Milan M; Djordjevic, Miroslav

    2004-01-01

    ...), method of moments (MoM), and physical optics (PO). The simulations combine higher order geometrical modeling and higher order field/current modeling, which is referred to as double-higher-order modeling...

  18. Synthesis and luminescent properties of uniform monodisperse LuPO4:Eu3+/Tb3+ hollow microspheres

    Science.gov (United States)

    Gao, Yu; Yu, He; Shi, Cheng; Zhao, Guiyan; Bi, Yanfeng; Xu, Baotong; Ding, Fu; Sun, Yaguang; Xu, Zhenhe

    2017-12-01

    Uniform monodisperse LuPO4:Eu3+/Tb3+ hollow microspheres with diameters of about 2.4 µm have been successfully synthesized by the combination of a facile homogeneous precipitation approach, an ion-exchange process and a calcination process. The possible formation mechanism for the hollow microspheres was presented. Furthermore, the luminescence properties revealed that the LuPO4:Eu3+ and LuPO4:Tb3+ phosphors show strong orange-red and green emissions under ultraviolet excitation, respectively, which endows this material with potential application in many fields, such as light display systems and optoelectronic devices. Since the synthetic process can be carried out at mild conditions, it should be straightforward to scale up the entire process for large-scale production of the LuPO4 hollow microspheres. Furthermore, this general and simple method may be of much significance in the synthesis of many other inorganic materials.

  19. La "consolation de philosophie" dans le poème 1,24 d'Horace

    Directory of Open Access Journals (Sweden)

    Marko Marinčič

    1999-12-01

    Full Text Available Bien que le poeme I ,24 soit souvent interprété comme une consolation poétique issue de Ia tradition consolatoire grecque de la période hellénistique ou même retoumant aux sources du genre, c'est à dire à la poésie grecque archaïque, les Iieux communs consolatoires figurant dans ce poème n'ont pas la même fonction que dans le reste de la littérature consolatoire. A part cela, le nom du dedicataire nous empêche de considérer le poème comme un simple produit rhétorique s'inspirant des modèles grecs, et c'est par analogie avec un autre poème dédié a Virgile, c. 1,3, que nous pouvons déterminer la difference. En effet, c. 1,24 diffère de son genre dans la même mesure et dans le même sens que c. 1,3 diffère du genre propemptique. Dans les deux cas, le moyens de persuasion semblent incongrus et dépassent les convenances du genre. La piété non-récompensée des vers 11-12, l'inexorabilité de la mort, personnifiée par la Muse horatienne qui s'impose ici les offices lugubres de praefica, par Mercure, aimable patron poétique d'Horace et incarnation de son idéal "épicurien" de sérenité, ici dans le rôle du gardien inexorable du niger grex, par Orphée qu'Horace ne fait même pas parvenir aux Enfers, tout cela n'apporte pas de consolation proprement dite. Même du point de vue extérieur, la maxime finale est la seule idée exprimée de manière explicite, mais introduite elle-même par trois longues questions. La consolation ne s'effectue qu'a travers le problème philosophique de la mort, ceci peut-être une réminiscence des discussions que Quintilius et Virgile avaient fait dès les années du Jardin de Philodème et de Siron, et dontHorace n'a pas pu rester ignorant. Aussi, Horace semble faire une allusion a l'Orphee virgilien (Georg. 4, connu au public littéraire romain depuis quelques années. Tandis que Virgile fait son Orphée s'égarer dans l'illusion d'une seconde vie, Horace se prend la liberté d

  20. Copper(II) manganese(II) orthophosphate, Cu0.5Mn2.5(PO4)2

    DEFF Research Database (Denmark)

    Warner, Terence Edwin; Bond, Andrew; Foghmoes, Søren Preben Vagn

    2011-01-01

    The title compound, Cu0.5Mn2.5(PO4)2, is a copper-manganese phosphate solid solution with the graftonite-type structure, (Mn,Fe,Ca,Mg)3(PO4)2. The structure has three distinct metal cation sites, two of which are occupied exclusively by MnII, and one of which accommodates CuII. Incorporation of Cu...

  1. Microwave-assisted hydrothermal synthesis of CePO{sub 4} nanostructures: Correlation between the structural and optical properties

    Energy Technology Data Exchange (ETDEWEB)

    Palma-Ramírez, D. [Instituto Politécnico Nacional, CICATA-Unidad Altamira, Km 14.5, Carretera Tampico-Puerto Industrial Altamira, C.P. 89600 Altamira, Tamps (Mexico); Domínguez-Crespo, M.A., E-mail: mdominguezc@ipn.mx [Instituto Politécnico Nacional, CICATA-Unidad Altamira, Km 14.5, Carretera Tampico-Puerto Industrial Altamira, C.P. 89600 Altamira, Tamps (Mexico); Torres-Huerta, A.M. [Instituto Politécnico Nacional, CICATA-Unidad Altamira, Km 14.5, Carretera Tampico-Puerto Industrial Altamira, C.P. 89600 Altamira, Tamps (Mexico); Dorantes-Rosales, H. [Instituto Politécnico Nacional, ESIQIE, Departamento de Metalurgia, C.P. 07300 México D.F. (Mexico); Ramírez-Meneses, E. [Universidad Iberoamericana, Departamento de Ingeniería y Ciencias Químicas, Prolongación Paseo de la Reforma 880, Lomas de Santa Fe, C.P. 01219 México D.F. (Mexico); Rodríguez, E. [Instituto Politécnico Nacional, CICATA-Unidad Altamira, Km 14.5, Carretera Tampico-Puerto Industrial Altamira, C.P. 89600 Altamira, Tamps (Mexico)

    2015-09-15

    Highlights: • An enhancement in the hydrothermal synthesis for obtaining of CePO{sub 4} is presented. • Microwave energy can replace the energy by convection for obtaining CePO{sub 4}. • CePO{sub 4} demonstrates to be an option to increase the optical properties of polymers. • Adjusting the pH, the sintering process is not necessary to obtain the desire phase. • CePO{sub 4} morphologies undergo evolution from nanorods to semispherical nanoparticles. - Abstract: In this work, the microwave-assisted hydrothermal method is proposed as an alternative to the synthesis of cerium phosphate (CePO{sub 4}) nanostructures to evaluate the influence of different synthesis parameters on both the structural and optical properties. In order to reach this goal, two different sets of experiments were designed, varying the reaction temperature (130 and 180 °C), synthesis time (15 and 30 min) and sintering temperature (400 and 600 °C), maintaining a constant pH = 3. Thereafter, two experimental conditions were selected to assess changes in the properties of CePO{sub 4} nanopowders with pH (1, 5, 9 and 11). The crystal structure and morphology of the nanostructures were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM) and scanning electron microscopy (SEM), respectively. Diffuse reflectance properties of CePO{sub 4} with different microstructures were studied. The results demonstrated that by using the microwave-assisted hydrothermal method, the shape, size and structural phase of CePO{sub 4} can be modulated by using relatively low synthesis temperatures and short reaction times, and depending on pH, a sintering process is not needed to obtain either a desired phase or size. Under the selected experimental conditions, the materials underwent an evolution from nanorods to semispherical nanoparticles, accompanied by a phase transition from hexagonal to monoclinic.

  2. The influence of reduced graphene oxide on electrical conductivity of LiFePO4-based composite as cathode material

    Science.gov (United States)

    Arifin, Muhammad; Aimon, Akfiny Hasdi; Winata, Toto; Abdullah, Mikrajuddin; Iskandar, Ferry

    2016-02-01

    LiFePO4 is fascinating cathode active materials for Li-ion batteries application because of their high electrochemical performance such as a stable voltage at 3.45 V and high specific capacity at 170 mAh.g-1. However, their low intrinsic electronic conductivity and low ionic diffusion are still the hindrance for their further application on Li-ion batteries. Therefore, the efforts to improve their conductivity are very important to elevate their prospecting application as cathode materials. Herein, we reported preparation of additional of reduced Graphene Oxide (rGO) into LiFePO4-based composite via hydrothermal method and the influence of rGO on electrical conductivity of LiFePO4-based composite by varying mass of rGO in composition. Vibration of LiFePO4-based composite was detected on Fourier Transform Infrared Spectroscopy (FTIR) spectra, while single phase of LiFePO4 nanocrystal was observed on X-Ray Diffraction (XRD) pattern, it furthermore, Scanning Electron Microscopy (SEM) images showed that rGO was distributed around LiFePO4-based composite. Finally, the 4-point probe measurement result confirmed that the optimum electrical conductivity is in additional 2 wt% rGO for range 1 to 2 wt% rGO.

  3. Effect of precursor concentration on the electrical properties of LiFePO4 prepared by solvothermal method

    Science.gov (United States)

    Rabbani, Ahmad Yasin; Fakhri, Hafizh A.; Arifin, Muhammad; Aimon, Akfiny Hasdi; Iskandar, Ferry

    2016-02-01

    Lithium iron phosphate (LiFePO4) is frequently used for Li-ion battery cathode. LiFePO4 has the high specific capacity at 170 mAhg-1, stable voltage at 3.45 V, stable structure, cheap, and low toxicity. The objective of this research is investigating the effect of precursor concentration on the electrical properties of LiFePO4 prepared by solvothermal method. LiOH, FeSO4, H3PO4, and citric acid were used as the precursors. The LiOH concentration was varied from 0.3 M to 1.8 M. The Fourier Transform Infrared Spectroscopy (FTIR) measurement identified the Fe-O, O-P-O, and P-O bonds which corresponding to LiFePO4. The result of 4-point probe measurement shows that, among the prepared samples, the sample from the precursor concentration of 1.8 M has the highest electrical conductivity.

  4. Assessment of soil contamination by (210)Po and (210)Pb around heavy oil and natural gas fired power plants.

    Science.gov (United States)

    Al-Masri, M S; Haddad, Kh; Doubal, A W; Awad, I; Al-Khatib, Y

    2014-06-01

    Soil contamination by (210)Pb and (210)Po around heavy oil and natural gas power plants has been investigated; fly and bottom ash containing enhanced levels of (210)Pb and (210)Po were found to be the main source of surface soil contamination. The results showed that (210)Pb and (210)Po in fly-ash (economizer, superheater) is highly enriched with (210)Pb and (210)Po, while bottom-ash (boiler) is depleted. The highest (210)Pb and (210)Po activity concentrations were found to be in economizer ash, whereas the lowest activity concentration was in the recirculator ash. On the other hand, (210)Pb and (210)Po activity concentrations in soil samples were found to be higher inside the plant site area than those samples collected from surrounding areas. The highest levels were found in the vicinity of Mhardeh and Tishreen power plants; both plants are operated by heavy oil and natural fuels, while the lowest values were found to be in those samples collected from Nasrieh power plant, which is only operated by one type of fuel, viz. natural gas. In addition, the levels of surface soil contamination have decreased as the distance from the power plant site center increased. Copyright © 2014 Elsevier Ltd. All rights reserved.

  5. Optimization of Activated Carbons Prepared by H3PO4 and Steam Activation of Oil Palm Shells

    Directory of Open Access Journals (Sweden)

    Daouda Kouotou

    2013-01-01

    Full Text Available In this study, activated carbons were prepared from oil palm shells by physicochemical activation. The methodology of experimental design was used to optimize the preparation conditions. The influences of the impregnation ratio (0.6–3.4 and the activation temperature between 601°C and 799°C on the following three responses: activated carbon yield (R/AC-H3PO4, the iodine adsorption (I2/AC-H3PO4, and the methylene blue adsorption (MB/AC-H3PO4 results were investigated using analysis of variance (ANOVA to identify the significant parameters. Under the experimental conditions investigated, the activation temperature of 770°C and impregnation ratio of 2/1 leading to the R/AC-H3PO4 of 52.10%, the I2/AC-H3PO4 of 697.86 mg/g, and the MB/AC-H3PO4 of 346.25 mg/g were found to be optimum conditions for producing activated carbon with well compromise of desirability. The two factors had both synergetic and antagonistic effects on the three responses studied. The micrographs of activated carbons examined with scanning electron microscopy revealed that the activated carbons were found to be mainly microporous and mesoporous.

  6. Polonium ({sup 210}Po) and lead ({sup 210}Pb) in marine organisms and their transfer in marine food chains

    Energy Technology Data Exchange (ETDEWEB)

    Carvalho, Fernando P., E-mail: carvalho@itn.p [Instituto Tecnologico e Nuclear, Departamento de Proteccao Radiologica e Seguranca Nuclear, E.N. 10, 2686-953 Sacavem (Portugal)

    2011-05-15

    The determination of {sup 210}Po and {sup 210}Pb was performed in marine organisms from the seashore to abyssal depths, encompassing a plethora of species from the microscopic plankton to the sperm whale. Concentrations of those radionuclides ranged from low values of about 5 x 10{sup -1} Bq kg{sup -1} (wet wt.) in jellyfish, to very high values of about of 3 x 10{sup 4} Bq kg{sup -1} (wet wt.) in the gut walls of sardines, with a common pattern of {sup 210}Po > {sup 210}Pb.These radionuclides are primarily absorbed from water and concentrated by phyto- and microzooplankton, and then are transferred to the next trophic level along marine food chains. Investigation in epipelagic, mesopelagic, bathypelagic and abyssobenthic organisms revealed that {sup 210}Po is transferred in the marine food webs with transfer factors ranging from 0.1 to 0.7, and numerically similar to those of the energy transfer in the marine food chains. As {sup 210}Po preferentially binds to amino acids and proteins, its transfer in food chains likely traces protein transfer and, thus, {sup 210}Po transfer factors are similar to ecotrophic coefficients. {sup 210}Pb is transferred less efficiently in marine food chains and this contributes to increased {sup 210}Po:{sup 210}Pb activity ratios in some trophic levels.

  7. Photoluminescence properties of a novel red emitting Ba10F2(PO4)6:Eu3+ phosphor

    Science.gov (United States)

    Peng, You-shun; Shi, Wei-wei; Han, Cong-lin; Kang, Yan-yan; Wang, Yan-su; Zhang, Zhi-wei

    2015-06-01

    A novel red-emitting phosphor Ba10F2(PO4)6:Eu3+ is synthesized by a high-temperature solid-state reaction. X-ray powder diffraction (XRD) analysis confirms the phase formation of Ba10F2(PO4)6:Eu3+ materials. The photoluminescence excitation (PLE) and emission (PL) spectra, the concentration dependence of the emission intensity, decay curves and Commission International de I'Eclairage (CIE) of the phosphors are investigated. It is observed that Ba10F2(PO4)6:Eu3+ phosphors exhibit two dominating bands situated at 591 and 616 nm, originating from the 5D0 → 7F1 and 5D0 → 7F2 transition of the Eu3+ ion, respectively. The decay time is also determined for various concentrations of Eu3+ in Ba10F2(PO4)6:Eu3+. Crystal lattice, PL spectra and decay time analysis indicate there exist two isolated Eu3+ crystallography sites in Ba10F2(PO4)6. The calculated color coordinates lie in the red region. Therefore, Ba10F2(PO4)6:Eu3+ phosphors may be good candidates for red components in near-UV (NUV) white LEDs.

  8. Enhanced Photoluminescent Properties and Crystalline Morphology of LiBaPO4:Tm3+ Phosphor through Microwave Sintering Method

    Science.gov (United States)

    Lai, Hsuan-Lin; Weng, Min-Hang; Yang, Ru-Yuan; Chang, Shoou-Jinn

    2016-01-01

    An investigation of the photoluminescent properties and crystalline morphology of blue emitting LiBa1−xPO4:xTm3+ phosphors with various concentrations (x = 0.005–0.030) of Tm3+ ions were synthesized by microwave sintering. For comparison, the LiBa1−xPO4:xTm3+ powders sintered at the same sintering condition but in a conventional furnace were also investigated. LiBaPO4 without second phase was formed no matter which furnace was used. More uniform grain size distributions are obtained by microwave sintering. When the concentration of Tm3+ ion was x = 0.015, the luminescence intensity reached a maximum value, and then decreased with the increases of the Tm3+ concentration due to concentration quenching effect. The microwave sintering significantly enhanced the emission intensity of LiBa1−xPO4:xTm3+ phosphors. Additionally, the d-d interaction is the key mechanism of concentration quenching for LiBaPO4:Tm3+. The chromaticity (x, y) for all LiBa1−xPO4:xTm3+ phosphors are located at (0.16, 0.05), which will be classified as a blue region. PMID:28773483

  9. Enhanced Photoluminescent Properties and Crystalline Morphology of LiBaPO4:Tm3+ Phosphor through Microwave Sintering Method

    Directory of Open Access Journals (Sweden)

    Hsuan-Lin Lai

    2016-05-01

    Full Text Available An investigation of the photoluminescent properties and crystalline morphology of blue emitting LiBa1−xPO4:xTm3+ phosphors with various concentrations (x = 0.005–0.030 of Tm3+ ions were synthesized by microwave sintering. For comparison, the LiBa1−xPO4:xTm3+ powders sintered at the same sintering condition but in a conventional furnace were also investigated. LiBaPO4 without second phase was formed no matter which furnace was used. More uniform grain size distributions are obtained by microwave sintering. When the concentration of Tm3+ ion was x = 0.015, the luminescence intensity reached a maximum value, and then decreased with the increases of the Tm3+ concentration due to concentration quenching effect. The microwave sintering significantly enhanced the emission intensity of LiBa1−xPO4:xTm3+ phosphors. Additionally, the d-d interaction is the key mechanism of concentration quenching for LiBaPO4:Tm3+. The chromaticity (x, y for all LiBa1−xPO4:xTm3+ phosphors are located at (0.16, 0.05, which will be classified as a blue region.

  10. Preparation and Characterization of Highly Efficient and Stable Visible-Light-Responsive Photocatalyst AgBr/Ag3PO4

    Directory of Open Access Journals (Sweden)

    Zhang Jinfeng

    2013-01-01

    Full Text Available AgBr/Ag3PO4 photocatalyst was synthesized using a facile coprecipitation method. The photocatalyst was characterized by X-ray powder diffraction (XRD, UV-Vis diffuse reflectance spectroscopy (DRS, scanning electron microscopy (SEM, Brunauer-Emmett-Teller (BET surface areas, and photoluminescence (PL technique. The activity of the photocatalyst was evaluated by the degradation of methyl orange (MO and rhodamine B (RhB. The results showed that the prepared AgBr/Ag3PO4 exhibited excellent performance and much higher photocatalytic activity than the single one under visible-light irradiation. The optimum mole ratio of Br/P in AgBr/Ag3PO4 samples is 0.3. The prepared AgBr/Ag3PO4 photocatalyst was transformed to Ag/AgBr/Ag3PO4 system with excellent property and good stability in the photocatalytic process. The possible mechanisms of the enhanced photocatalytic activity for the AgBr/Ag3PO4 were also discussed in detail.

  11. 210Po and 210Pb Activity Concentrations in Cigarettes Produced in Vietnam and Their Estimated Dose Contribution Due to Smoking

    Science.gov (United States)

    Tran, Thuy-Ngan N.; Le, Cong-Hao; Chau, Van-Tao

    Smoking cigarettes contributes significantly to the increase of radiation in human body because 210Po and 210Pb exist relatively high in tobacco leaves. Therefore, these two radioisotopes in eighteen of the most frequently sold cigarette brands produced in Vietnam were examined in this study. 210Po was determined by alpha spectroscopy using a passivated implanted planar silicon (PIPS) detector after a procedure including radiochemical separation and spontaneous deposition of polonium on a copper disc (the deposition efficiency of 210Po on a copper disc was approximately 94%). Sequentially, 210Pb was determined through the ingrowth of 210Po after storing the sample solutions for approximately six months. The activity concentrations of 210Po in cigarettes ranged from 13.8 to 82.6 mBq/cigarette (the mean value was 26.4 mBq/cigarette) and the activity concentrations of 210Pb in cigarettes ranged from 13.9 to 78.8 mBq/cigarette (the mean value was 25.8 mBq/cigarette). The annual committed effective dose for smokers who smoke one pack per day was also estimated to be 295.4 µSv/year (223.0 µSv/year and 72.4 µSv/year from 210Po and 210Pb, respectively). These indicated that smoking increased the risk of developing lung cancer was approximately 60 times greater for smokers than for non-smokers.

  12. Comparing the Electrochemical Performance of LiFePO4/C Modified by Mg Doping and MgO Coating

    Directory of Open Access Journals (Sweden)

    Jianjun Song

    2013-01-01

    Full Text Available Supervalent cation doping and metal oxide coating are the most efficacious and popular methods to optimize the property of LiFePO4 lithium battery material. Mg-doped and MgO-coated LiFePO4/C were synthesized to analyze their individual influence on the electrochemical performance of active material. The specific capacity and rate capability of LiFePO4/C are improved by both MgO coating and Mg doping, especially the Mg-doped sample—Li0.985Mg0.015FePO4/C, whose discharge capacity is up to 163 mAh g−1, 145.5 mAh g−1, 128.3 mAh g−1, and 103.7 mAh g−1 at 1 C, 2 C, 5 C, and 10 C, respectively. The cyclic life of electrode is obviously increased by MgO surface modification, and the discharge capacity retention rate of sample LiFePO4/C-MgO2.5 is up to 104.2% after 100 cycles. Comparing samples modified by these two methods, Mg doping is more prominent on prompting the capacity and rate capability of LiFePO4, while MgO coating is superior in terms of improving cyclic performance.

  13. Natural radionuclides (210)Po and (210)Pb in the Delaware and Chesapeake Estuaries: modeling scavenging rates and residence times.

    Science.gov (United States)

    Marsan, D; Rigaud, S; Church, T

    2014-12-01

    During the spring and summer months of 2012, (210)Po and (210)Pb activity were measured in the dissolved and particulate phases from the Delaware and upper Chesapeake estuaries. The upper Delaware estuary, near the freshwater end member, was characterized by high-suspended matter concentrations that scavenged dissolved (210)Po and (210)Pb. Box models were applied using mass balance calculations to assess the nuclides residence times in each estuary. Only 60% of the dissolved (210)Po and 55% of the dissolved (210)Pb from the Delaware estuary were exported to coastal waters. A large fraction of soluble (210)Po and (210)Pb within the estuary was either reversibly adsorbed onto suspended particles, trapped in sediment accumulation zones (such as intertidal marshes), bioaccumulated into phytoplankton and discharged to the coastal ocean. The upper Chesapeake estuary was largely characterized by sub-oxic bottom waters that contained higher concentrations of dissolved (210)Po and (210)Pb, hypothesized to be subjected to redox cycling of manganese. The Delaware and Chesapeake estuary mean residence times for (210)Po differed significantly at 86 ± 7 and 126 ± 10 days respectively, while they were similar for (210)Pb (67 ± 6-55 ± 5 days). The difference in residence times corresponds to the greater extent of biogeochemical scavenging and regeneration processes within the upper Chesapeake. Copyright © 2014 Elsevier Ltd. All rights reserved.

  14. Co11Li[(OH)5O][(PO3OH)(PO4)5], a Lithium-Stabilized, Mixed-Valent Cobalt(II,III) Hydroxide Phosphate Framework.

    Science.gov (United States)

    Ludwig, Jennifer; Geprägs, Stephan; Nordlund, Dennis; Doeff, Marca M; Nilges, Tom

    2017-09-18

    A new metastable phase, featuring a lithium-stabilized mixed-valence cobalt(II,III) hydroxide phosphate framework, Co11.0(1)Li1.0(2)[(OH)5O][(PO3OH)(PO4)5], corresponding to the simplified composition Co1.84(2)Li0.16(3)(OH)PO4, is prepared by hydrothermal synthesis. Because the pH-dependent formation of other phases such as Co3(OH)2(PO3OH)2 and olivine-type LiCoPO4 competes in the process, a pH value of 5.0 is crucial for obtaining a single-phase material. The crystals with dimensions of 15 μm × 30 μm exhibit a unique elongated triangular pyramid morphology with a lamellar fine structure. Powder X-ray diffraction experiments reveal that the phase is isostructural with the natural phosphate minerals holtedahlite and satterlyite, and crystallizes in the trigonal space group P31m (a = 11.2533(4) Å, c = 4.9940(2) Å, V = 547.70(3) Å(3), Z = 1). The three-dimensional network structure is characterized by partially Li-substituted, octahedral [M2O8(OH)] (M = Co, Li) dimer units which form double chains that run along the [001] direction and are connected by [PO4] and [PO3(OH)] tetrahedra. Because no Li-free P31m-type Co2(OH)PO4 phase could be prepared, it can be assumed that the Li ions are crucial for the stabilization of the framework. Co L-edge X-ray absorption spectroscopy demonstrates that the cobalt ions adopt the oxidation states +2 and +3 and hence provides further evidence for the incorporation of Li in the charge-balanced framework. The presence of three independent hydroxyl groups is further confirmed by infrared spectroscopy. Magnetization measurements imply a paramagnetic to antiferromagnetic transition at around T = 25 K as well as a second transition at around 9-12 K with a ferromagnetic component below this temperature. The metastable character of the phase is demonstrated by thermogravimetric analysis and differential scanning calorimetry, which above 558 °C reveal a two-step decomposition to CoO, Co3(PO4)2, and olivine-type LiCoPO4 with release of

  15. In pursuit of the rhabdophane crystal structure: from the hydrated monoclinic LnPO{sub 4}.0.667H{sub 2}O to the hexagonal LnPO{sub 4} (Ln = Nd, Sm, Gd, Eu and Dy)

    Energy Technology Data Exchange (ETDEWEB)

    Mesbah, Adel, E-mail: adel.mesbah@cea.fr [ICSM, UMR 5257 CNRS – CEA – ENSCM – Université de Montpellier, Site de Marcoule - Bât 426, BP 17171, 30207 Bagnols/Cèze (France); Clavier, Nicolas [ICSM, UMR 5257 CNRS – CEA – ENSCM – Université de Montpellier, Site de Marcoule - Bât 426, BP 17171, 30207 Bagnols/Cèze (France); Elkaim, Erik [Synchrotron SOLEIL, L' Orme des Merisiers, Saint-Aubin, BP 48, 91192 Gif-sur-Yvette Cedex (France); Szenknect, Stéphanie; Dacheux, Nicolas [ICSM, UMR 5257 CNRS – CEA – ENSCM – Université de Montpellier, Site de Marcoule - Bât 426, BP 17171, 30207 Bagnols/Cèze (France)

    2017-05-15

    The dehydration process of the hydrated rhabdophane LnPO{sub 4}.0.667H{sub 2}O (Ln = La to Dy) was thoroughly studied over the combination of in situ high resolution synchrotron powder diffraction and TGA experiments. In the case of SmPO{sub 4}.0.667H{sub 2}O (monoclinic, C2), a first dehydration step was identified around 80 °C leading to the formation of SmPO{sub 4}.0.5H{sub 2}O (Monoclinic, C2) with Z =12 and a =17.6264(1) Å, b =6.9704(1) Å, c =12.1141(1) Å, β=133.74(1) °, V =1075.33(1) Å{sup 3}. In agreement with the TGA and dilatometry experiments, all the water molecules were evacuated above 220 °C yielding to the anhydrous form, which crystallizes in the hexagonal P3{sub 1}21 space group with a =7.0389(1) Å, c =6.3702(1) Å and V =273.34(1) Å{sup 3}. This study was extended to selected LnPO{sub 4}.0.667H{sub 2}O samples (Ln= Nd, Gd, Eu, Dy) and the obtained results confirmed the existence of two dehydration steps before the stabilization of the anhydrous form, with the transitory formation of LnPO{sub 4}.0.5H{sub 2}O. - Graphical abstract: The dehydration process of the rhabdophane SmPO{sub 4}.0.667H{sub 2}O was studied over combination of in situ high resolution synchrotron powder diffraction and TGA techniques, a first dehydration was identified around 80 °C leading to the formation of SmPO{sub 4}.0.5H{sub 2}O (Monoclinic, C2). Then above 220 °C, the anhydrous form of the rhabdophane SmPO{sub 4} was stabilized and crystallizes in the hexagonal P3{sub 1}21 space group. - Highlights: • In situ synchrotron powder diffraction was carried out during the dehydration of the rhabdopahe LnPO{sub 4}.0.667H{sub 2}O. • The heat of the rhabdophane LnPO{sub 4}.0.667H{sub 2}O leads to LnPO{sub 4}.0.5H{sub 2}O then to anhydrous rhabdophane LnPO{sub 4}. • LnPO{sub 4}.0.5H{sub 2}O (monoclinic, C2) and LnPO{sub 4} (Hexagonal, P3{sub 1}21) were solved over the use of direct methods.

  16. Dynamika zmian temperatury ręki reumatoidalnej po wybranych zabiegach z zakresu termoterapii

    Directory of Open Access Journals (Sweden)

    Małgorzata Gizińska

    2011-08-01

    Full Text Available Wstęp: W procesie usprawniania osób z chorobami reumatycznymi wykorzystuje się wiele zabiegów z zakresu ciepłolecznictwai krioterapii. W dostępnym piśmiennictwie niewiele jest opisówbadań dotyczących efektów termicznych występujących w tkankachw wyniku stosowania takich zabiegów w obrębie ręki reumatoidalnej.Z tego powodu autorzy podjęli próbę określenia przebiegudynamiki zmian temperatury po zastosowaniu powszechniestosowanych u pacjentów z reumatoidalnym zapaleniem stawów(RZS zabiegów z zakresu termoterapii, w aspekcie zmian zachodzącychw mikrokrążeniu podczas 120 minut obserwacji.Materiały i metody: Do dwóch grup przydzielono 27 pacjentówz rozpoznanym RZS (średni wiek badanych 57 ±7,9 roku: I grupaliczyła 14 osób, u których naświetlano jedną rękę promiennikiempodczerwieni IR-A, -B oraz -C, II grupa – 13 osób, u których wykonanozabieg nadmuchu jednej ręki zimnym powietrzem (–30°C.Analizy rozkładu temperatury dokonano na podstawie 120-minutowejobserwacji zmian temperatury powierzchniowej obu rąk, dozapisu której użyto kamery termowizyjnej. U każdej osoby wykonano8 zdjęć termowizyjnych w określonych odstępach czasu:przed zabiegiem, zaraz po zabiegu oraz 5, 15, 30, 45, 60 i 120 minutpo zabiegu.Wyniki: Istotne różnice temperatur mierzonych w kolejnych odstępachczasu zaobserwowano we wszystkich grupach tylko podczas wynopierwszych5 minut po zabiegu (p < 0,05. Maksymalny wzrost temperaturyodnotowany zaraz po zabiegu IR-A, -B, -C wynosił 3,5°C. Ponadmuchu zimnym powietrzem (–30°C maksymalne obniżenietemperatury mierzonej zaraz po zabiegu wynosiło 6,4°C (ryc. 1 i 2.Wnioski: Istotne zmiany temperatury powierzchniowej rąk obserwowanow ciągu pierwszych 5 minut po zabiegu, zarówno ponaświetlaniu IR-A, -B, -C, jak i nadmuchu zimnym powietrzemo temperaturze ok. –30°C. W przypadku zabiegu cieplnego wartośćtemperatury w ciągu tego czasu pozostawała powyżej warto

  17. Improving the electrochemical performances of Li-rich Li1.20Ni0.13Co0.13Mn0.54O2 through a cooperative doping of Na+ and PO43- with Na3PO4

    Science.gov (United States)

    Liu, Yi; Ning, De; Zheng, Lirong; Zhang, Qinghua; Gu, Lin; Gao, Rui; Zhang, Jicheng; Franz, Alexandra; Schumacher, Gerhard; Liu, Xiangfeng

    2018-01-01

    Li-rich layered oxide cathodes suffer from poor rate capability, voltage decay and inferior cycling stability. Herein, we propose a novel synergistic strategy to improve the electrochemical performances of Li-rich Li1.20Ni0.13Co0.13Mn0.54O2 by the co-doping of Na+ and PO43-. The co-doping of Na+ for Li and PO43- for Mn is simultaneously achieved using Na3PO4 as a dopant. The co-doping of Na+ and PO43- not only enhances the high-rate performance (106.4 mAhg-1@10C) and capacity retention (93.8%@1C@100 cycles) but also mitigates the voltage decay owing to the synergistic effect of Na+ and PO43- co-doping. The synergistic mechanism is unraveled based on neutron diffraction, aberration-corrected scanning transmission electron microscope, X-ray photoelectron spectroscopy, ex-situ X-ray absorption spectra, ex-situ X-ray diffraction, electrochemical impedance spectroscopy and electrochemical measurements. The co-doping of Na+ and PO43- enlarges the interlayer spacing and suppresses Li/Ni mixing which increases Li+ diffusivity and enhances the rate capability. Meanwhile, the co-doping of Na+ and PO43- shrinks the thickness of the slabs, weakens the TM-O covalency and alleviates the volume change in the charge/discharge process which improves the layered structure stability and the cycling performances. This study presents some new insights into designing high performance cathode materials through a cooperative modulation of different crystal sites doping.

  18. Controlled synthesis and photocatalytic properties of rhombic dodecahedral Ag{sub 3}PO{sub 4} with high surface energy

    Energy Technology Data Exchange (ETDEWEB)

    Xie, Yao, E-mail: xieyao1895@163.com; Huang, Zhaohui, E-mail: huang118@cugb.edu.cn; Zhang, Zhijie, E-mail: zzj6943@163.com; Zhang, Xiaoguang, E-mail: xgzhang521@yeah.net; Wen, Ruilong, E-mail: wenruilong123@126.com; Liu, Yangai, E-mail: liuyang@cugb.edu.cn; Fang, Minghao, E-mail: fmh@cugb.edu.cn; Wu, Xiaowen, E-mail: xwwu@cugb.edu.cn

    2016-12-15

    Graphical abstract: The high amount of rhombic dodecahedral Ag{sub 3}PO{sub 4} particles with a high exposure of the {110} facets and high surface energy (the surface energy of the {110} facets was 1.31 J/m{sup 2}, greater than that of the {100} facet (1.12 J/m{sup 2}).) exhibited excellent photocatalytic activity. - Highlights: • High contents of rhombic dodecahedral Ag{sub 3}PO{sub 4} photocatalysts are prepared. • Excessive EG can destroy the morphology of Ag{sub 3}PO{sub 4} in synthesis process. • The rhombic dodecahedral Ag{sub 3}PO{sub 4} exhibits high surface energy. • High surface energy implies high photocatalytic activity. - Abstract: In this study, a series of Ag{sub 3}PO{sub 4} photocatalysts with different contents of rhombic dodecahedral particles were prepared in one pot by a facile, novel hydrothermal method using ethylene glycol (EG), which served as both a morphology modifier and reducing agent. The effects of EG content on the morphologies of Ag{sub 3}PO{sub 4} photocatalysts were discussed. The photocatalytic activity of the Ag{sub 3}PO{sub 4} photocatalysts was evaluated by the degradation of methylene blue trihydrate under visible-light irradiation. With the use of 0.8% EG in the reaction solvent, the sample exhibited excellent photocatalytic activity, attributed to the high amount of rhombic dodecahedral Ag{sub 3}PO{sub 4} particles with a high exposure of the {110} facets and high surface energy. The surface energy of the {110} facets was 1.31 J/m{sup 2}, greater than that of the {100} facet (1.12 J/m{sup 2}). However, with 1% EG in the reaction solvent, although the Ag{sub 3}PO{sub 4} photocatalysts were composed of a majority of rhombic dodecahedral Ag{sub 3}PO{sub 4} particles, tiny Ag particles formed from Ag{sup +} under the action of EG attached on the surface of the sample decreased the absorption of visible light, resulting in low photocatalytic activity.

  19. Aquifer recharge from infiltration basins in a highly urbanized area: the river Po Plain (Italy)

    Science.gov (United States)

    Masetti, M.; Nghiem, S. V.; Sorichetta, A.; Stevenazzi, S.; Santi, E. S.; Pettinato, S.; Bonfanti, M.; Pedretti, D.

    2015-12-01

    Due to the extensive urbanization in the Po Plain in northern Italy, rivers need to be managed to alleviate flooding problems while maintaining an appropriate aquifer recharge under an increasing percentage of impermeable surfaces. During the PO PLain Experiment field campaign in July 2015 (POPLEX 2015), both active and under-construction infiltration basins have been surveyed and analyzed to identify appropriate satellite observations that can be integrated to ground based monitoring techniques. A key strategy is to have continuous data time series on water presence and level within the basin, for which ground based monitoring can be costly and difficult to be obtained consistently.One of the major and old infiltration basin in the central Po Plain has been considered as pilot area. The basin is active from 2003 with ground based monitoring available since 2009 and supporting the development of a calibrated unsaturated-saturated two-dimensional numerical model simulating the infiltration dynamics through the basin.A procedure to use satellite data to detect surface water change is under development based on satellite radar backscatter data with an appropriate incidence angle and polarization combination. An advantage of satellite radar is that it can observe surface water regardless of cloud cover, which can be persistent during rainy seasons. Then, the surface water change is correlated to the reservoir water stage to determine water storage in the basin together with integrated ground data and to give quantitative estimates of variations in the local water cycle.We evaluated the evolution of the infiltration rate, to obtain useful insights about the general recharge behavior of basins that can be used for informed design and maintenance. Results clearly show when the basin becomes progressively clogged by biofilms that can reduce the infiltration capacity of the basin by as much as 50 times compared to when it properly works under clean conditions.

  20. 2017 Solar Eclipse in Hopkinsville, KY: E/PO Feedback from Two Venues

    Science.gov (United States)

    Dowling, Timothy E.; Consolmagno, Guy

    2017-10-01

    Hopkinsville, Kentucky was the largest town in the region of maximum totality for the 21 August 2017 Solar Eclipse, and transformed itself into “Eclipseville” with extensive media attention. Here we give 2 on-the-ground reports on education and public outreach (E/PO) activities from Hopkinsville. One of us (TD) partnered with the Kentucky Division of Emergency Management (KYEM) and was in the Hopkinsville VIP area, and the other (GC) led a series of E/PO events at the Hopkinsville Church of Ss. Peter & Paul, which were nationally advertised in diocesan newspapers. In addition, both of us were interviewed extensively by local and national media before the event. Pre-event planning by KYEM extended for over a year, and culminated in a 6-hour, 12 July 2017 Tabletop Exercise (TTX) run by FEMA. This face-to-face workshop drew over 250 participants, including Kentucky’s Lt. Governor, health and public safety officials at the state-level and from the 21 Kentucky counties in the path of totality, mayors and convention-bureau officials from the affected KY towns, the KY National Guard, the U.S. Depts. of Health and Human Services, Homeland Security, and Transportation, the National Weather Service, the U.S. Coast Guard for riverboat traffic, the U.S. Forest Service, the American Red Cross, representatives from ATT, Verizon and Sprint, and representatives from local universities—it was the largest TTX in Kentucky’s history. Here, we report on E/PO feedback we assembled from the VIP and parochial sites, including the most frequently asked questions, which types of answers seemed to be most effective, and how actual events compared with the large-crowd preparations and planning.

  1. NCO-sP(EO-stat-PO) surface coatings preserve biochemical properties of RGD peptides.

    Science.gov (United States)

    Fiedler, Jörg; Groll, Jürgen; Engelhardt, Erika; Gasteier, Peter; Dahmen, Claudia; Kessler, Horst; Moeller, Martin; Brenner, Rolf E

    2011-01-01

    We have previously reported that star shaped poly(ethylene oxide-stat-propylene oxide) macromers with 80% EO content and isocyanate functional groups at the distal ends [NCO-sP(EO-stat-PO)] can be used to generate coatings that are non-adhesive but easily functionalized for specific cell adhesion. In the present study, we investigated whether the NCO-sP(EO-stat-PO) surfaces maintain peptide configuration-specific cell-surface interactions or if differences between dissimilar binding molecules are concealed by the coating. To this end, we have covalently immobilized both linear-RGD peptides (gRGDsc) and cyclic-RGD (RGDfK) peptides in such coatings. Subsequently, SaOS-2 or human multipotent mesenchymal stromal cells (MSC) were seeded on these substrates. Cell adhesion, spreading and survival was observed for up to 30 days. The time span for cell adherence was not different on linear and cyclic RGD peptides, but was shorter in comparison to the unmodified glass surface. MSC proliferation on cyclic RGDfK modified coatings was 4 times higher than on films functionalized by linear gRGDsc sequences, underlining that the NCO-sP(EO-stat-PO) film preserves the configuration-specific biochemical peptide properties. Under basal conditions, MSC expressed osteogenic marker genes after 14 days on cyclic RGD peptides, but not on linear RGD peptides or the unmodified glass surfaces. Our results indicate specific effects of these adhesion peptides on MSC biology and show that this coating system is useful for selective testing of cellular interactions with adhesive ligands.

  2. Enhanced toxicity of aerosol in fog conditions in the Po Valley, Italy

    Science.gov (United States)

    Decesari, Stefano; Sowlat, Mohammad Hossein; Hasheminassab, Sina; Sandrini, Silvia; Gilardoni, Stefania; Facchini, Maria Cristina; Fuzzi, Sandro; Sioutas, Constantinos

    2017-06-01

    While numerous studies have demonstrated the association between outdoor exposure to atmospheric particulate matter (PM) and adverse health effects, the actual chemical species responsible for PM toxicological properties remain a subject of investigation. We provide here reactive oxygen species (ROS) activity data for PM samples collected at a rural site in the Po Valley, Italy, during the fog season (i.e., November-March). We show that the intrinsic ROS activity of Po Valley PM, which is mainly composed of biomass burning and secondary aerosols, is comparable to that of traffic-related particles in urban areas. The airborne concentration of PM components responsible for the ROS activity decreases in fog conditions, when water-soluble species are scavenged within the droplets. Due to this partitioning effect of fog, the measured ROS activity of fog water was contributed mainly by water-soluble organic carbon (WSOC) and secondary inorganic ions rather than by transition metals. We found that the intrinsic ROS activity of fog droplets is even greater (> 2.5 times) than that of the PM on which droplets are formed, indicating that redox-active compounds are not only scavenged from the particulate phase, but are also produced within the droplets. Therefore, even if fog formation exerts a scavenging effect on PM mass and redox-active compounds, the aqueous-phase formation of reactive secondary organic compounds can eventually enhance ROS activity of PM when fog evaporates. These findings, based on a case study during a field campaign in November 2015, indicate that a significant portion of airborne toxicity in the Po Valley is largely produced by environmental conditions (fog formation and fog processing) and not simply by the emission and transport of pollutants.

  3. A poética de Augusto dos Anjos: o entre-lugar do Eu

    Directory of Open Access Journals (Sweden)

    Camillo Cavalcanti

    2014-03-01

    Full Text Available A poesia de Augusto dos Anjos pertence às últimas manifestações do lirismo tradicional no Brasil, portanto distante das rupturas vanguardistas ou modernistas. O Darwinismo é apenas aparente, mas a escatologia é profunda e pretende destruir a estrutura cientificista. O grotesco alimenta a antilira, ao lado da filosofia transcendental. Embora imersa nesse binarismo gnosiológico, a obra Eu (1912 tem uma fisionomia lunar, e não solar – ponto de discussão sobre o art nouveau na poética do Eu. Todos esses aspectos estruturam um entrelugar plurissignificativo.

  4. Calendar Ageing of LiFePO4/C Batteries in the Second Life Applications

    DEFF Research Database (Denmark)

    Swierczynski, Maciej Jozef; Stroe, Daniel-Ioan; Kær, Søren Knudsen

    2017-01-01

    Lithium-ion battery second life usage might be an interesting solution for certain applications and it can bring not only environmental benefits but also e.g. lower electric vehicles or hybrid electric vehicles total cost of ownership. However, the electrical performance and performance degradation...... of the battery systems in the second life application are still unknown what brings significant economic risk and hinders second life battery usage. This work investigates the capacity and power degradation of the 2.5Ah nanophosphate LiFePO4/C cells under different the second life calendar ageing regimes....

  5. El montaje y el gesto (Ezra Pound / Henri Michaux): dos poéticas del ideograma

    OpenAIRE

    Pérez Villalón, Fernando

    2015-01-01

    Este ensayo compara el modo en que los escritores Ezra Pound y Henri Michaux incorporan en su pensamiento y su obra poética un diálogo con la escritura china, y específicamente con la noción de ideograma como un modo de entender su naturaleza. Tanto Pound como Michaux comparten un alto grado de fascinación por la dimensión pictográfica de la escritura china, que consideran como menos radicalmente divorciada de las cosas que la escritura alfabética, pero en Pound predomina una apropiación del ...

  6. Shock wave induced phase transition in α -FePO 4

    Science.gov (United States)

    Joshi, K. D.; Suresh, N.; Jyoti, G.; Kulshreshtha, S. K.; Gupta, S. C.; Sikka, S. K.

    Shock wave induced response of the berlinite form of FePO 4 has been investigated up to 8.5 GPa. The X-ray diffraction measurements on the shock recovered samples reveal transition to the mixture of an amorphous phase and an orthorhombic phase around 5 GPa. The proportion of the amorphous material in the recovered sample is found to decrease at higher pressure. The results are interpreted in terms of a three-level free energy diagram for the crystal to amorphous transitions.

  7. Poéticas ciberculturais: narrativas da informação e da reflexividade

    Directory of Open Access Journals (Sweden)

    Mariana Tavernari

    2013-12-01

    Full Text Available O artigo versa sobre a centralidade da cibercultura na contemporaneidade em suas formas narrativas nas mídias digitais, engendradas por determinadas articulações discursivas e processos de agenciamento que, em conjunto, configuram gêneros emergentes e funções poéticas definidas. Essa perspectiva teórica será evidenciada e trabalhada no sentido de investigar as particularidades das narrativas da informação, como a reflexividade, expressas em vídeos online, infográficos, documentários e outros enunciados nas mídias digitais.

  8. Magnetotelluric and DC electrical soundings in the Po plain (Veneto region)

    Energy Technology Data Exchange (ETDEWEB)

    Alfano, L.; Giudici, M. [Milan Univ. (Italy). Dip. di Scienze della Terra, Sezione di geofisica; Zaja, A. [Padua Univ. (Italy). Dip. di Geologia, Paleontologia e Geofisica

    1998-08-01

    Eleven MT soundings and two dipole-dipole electrical soundings were carried out in the area of the Po plain south of the town of Padua. MT soundings were performed in the frequency band from 100 to 1/64 Hz; DC soundings were achieved, respectively with a 2000 and 4000 m length of the array. The electrical interpretative models show a predominant monoclinical tectonic behaviour with an evident deepening of the resistive basement toward NE. The joint use of the two electrical techniques defined the geological and structural setting up to a depth of 2 km in a highly conductive area.

  9. Poética del cuadro ausente : poesía y pintura en Antonio Colinas

    OpenAIRE

    Martínez Fernández, José Enrique

    2008-01-01

    Reflexión sobre la relación secular entre pintura y poesía a partir de textos poéticos contemporáneos. Problemática actual de la écfrasis, con aspectos como la representación, la ilusión referencial y la interpretación metafórica. Se estudian, finalmente, los contactos de un poeta de hoy, Antonio Colinas, con la pintura, tanto en sus ensayos como en su poesía

  10. Analysis of the clustering in 212Po, 218Rn and 232U

    Science.gov (United States)

    Ibrahim, T. T.; Wyngaardt, S. M.; Kimene Kaya, B. D. C.

    2017-10-01

    We studied the ground state band properties of 212Po, 218Rn and 232U using the binary cluster model. The nuclei are treated as a 208Pb-core plus a cluster interacting via a local potential of Saxon-Woods type functional form whose parameters are derived from Michigan-3-Yukawa (M3Y) microscopic potential model. Further correction in the internal structure of the hybrid potential model is attributed to the nucleon distribution in the overlap region of the core-cluster system. Overall our calculated results are found to compare favourably well with available experimental data.

  11. Degradation Studies on LiFePO4 cathode

    DEFF Research Database (Denmark)

    Scipioni, Roberto; Jørgensen, Peter Stanley; Hjelm, Johan

    2014-01-01

    Lithium-ion batteries are a promising technology for automotive application, but limited performance and lifetime is still a big issue. The aim of this work is to study and address degradation processes which affect LiFePO4 (LFP) cathodes - one of the most common cathodes in commercial Li...... in order to observe changes in the pore structure or micro cracks that would affect electronic percolation. Figure 4 displays an example of a fresh LFP cathode after FIB cutting. White particles are LFP grains while the black area contains carbon particles and pores, which are difficult to distinguish from...

  12. Batrachochytrium dendrobatidis in amphibians from the Po River Delta, Northern Italy

    Directory of Open Access Journals (Sweden)

    Gentile Francesco Ficetola

    2011-12-01

    Full Text Available Batrachochytrium dendrobatidis is a pathogen infecting amphibians at the global scale and causing their decline, but knowledge of the distribution of this pathogen is far from complete. We sampled amphibians from three species (Hyla intermedia, Rana dalmatina and Pelophylax synklepton esculentus to evaluate whether B. dendrobatidis infects amphibians in the Po River Delta Natural Park, Northern Italy. We detected the pathogen in one population of P. sk. esculentus (prevalence: 0.33. These findings expand the known distribution of B. dendrobatidis in Italy and add further concern to the conservation of amphibians in this area.

  13. Poéticas del fracaso. Yvette Sánchez, Roland Spiller (Hrsg.)

    OpenAIRE

    Sánchez, Yvette

    2009-01-01

    Poéticas del fracaso En medio del crack de la bolsa de valores editamos este libro que enfoca la poeticidad del fracaso, al que desde siempre la literatura le ha ofrecido asilo, sacando a luz sus camufladas calidades edificantes y poniendo patas arriba su brutal y siempre humillante esencia, neutralizándola estéticamente. Mientras que la relación íntima entre el fracaso y la literatura ha sido productiva y constituyente, tanto en el aspecto textual como en sus implicaciones autobiográfi...

  14. La espiritualidad de Mario Luzi en su obra poética

    OpenAIRE

    Esteban Bernabé, Encarnación

    2015-01-01

    OBJETIVOS: El objetivo principal de esta tesis es dar difusión en nuestro país de la vida y la obra del insigne poeta toscano Mario Luzi, candidato hasta en seis ocasiones al premio Nobel de literatura y sin embargo, gran desconocido entre el público español. El otro gran objetivo de este trabajo es el de facilitar un acercamiento a la comprensión de la poética llamada “espiritual” sirviéndonos de algunas claves teológicas que hicieron de guía en el viaje terrestre y celeste del poeta....

  15. MALAS HIERBAS: Análisis de una poética personal de arte participativo

    OpenAIRE

    VICARI ZANATTA, CLÁUDIA

    2013-01-01

    Esta Tesis trata sobre una poética personal de arte participativo desarrollada entre los años 2000 y 2012 en Brasil y en España. A lo largo del texto observamos y analizamos el campo experimental de la práctica artística participativa comprendida como una producción conjunta entre el público (participante) y el/la artista. El concepto de participación tiene un papel fundamental en esta investigación, pues por medio de él se operan las articulaciones con nuestro proceso...

  16. Malas hierbas : análisis de uma poética personal de arte participativo

    OpenAIRE

    Cláudia Vicari Zanatta

    2013-01-01

    Esta Tesis trata sobre una poética personal de arte participativo desarrollada entre los años 2000 y 2012 en Brasil y en España. A lo largo del texto observamos y analizamos el campo experimental de la práctica artística participativa comprendida como una producción conjunta entre el público (participante) y el/la artista. El concepto de participación tiene un papel fundamental en esta investigación, pues por medio de él se operan las articulaciones con nuestro proceso creativo. Cuestionamos ...

  17. Memoria y desmemoria, pensamiento y poética en la dramaturgia de Juan Mayorga

    OpenAIRE

    March Tortajada, Robert

    2014-01-01

    En Memoria y desmemoria, pensamiento y poética en la dramaturgia de Juan Mayorga nos hemos adentrado en los puntos de contacto entre filosofía y teatro para, a partir de ahí, ver cómo éstos son permeables. Nuestra investigación se ha interesado en el diálogo, en la intertextualidad, en ver cómo las piezas dramáticas de Juan Mayorga se relacionan unas con otras y desestabilizan, sobre todo, aquello que creemos saber. Si de la palabra teatral del autor nos interesa la desconfianza hacia el leng...

  18. Henri Meschonnic entre langue et poésie, sous la direction de Marcella Leopizzi

    OpenAIRE

    Arena, Sara

    2016-01-01

    Come emerge dai due testi introduttivi alla silloge di interventi, riuniti in questo numero di «Studi di letteratura francese» quale ideale celebrazione dell’ottantesimo compleanno di Henri Meschonnic, scomparso nel 2009 (Giovanni Dotoli, Le Flambeau d’un message, pp. 11-14; Marcella Leopizzi, La Voix d’Henri Meschonnic: vivre-sentir poème, pp. 15-23), l’asse prescelto per la pubblicazione non si pone l’obiettivo di una presentazione esaustiva dell’opera di Meschonnic, ma di un’indagine unita...

  19. Astronomie, écologie et poésie par Hubert Reeves

    CERN Multimedia

    CERN. Geneva; BON, Francois

    2010-01-01

    Hubert ReevesL'astrophysicien donne une conférence puis s'entretient avec l'écrivain François Bon autour de :"Astronomie, écologie et poésie"Pour plus d'informations : http://outreach.web.cern.ch/outreach/FR/evenements/conferences.htmlNombre de places limité. Réservation obligatoire à la Réception du CERN : +41 22 767 76 76  Soirée diffusée en direct sur le Web : http://webcast.cern.ch/      

  20. Eudoro de Sousa e a Poética aristotélica

    OpenAIRE

    Claudia Pellegrini Drucker

    2010-01-01

    A tradução souseana da Poética faz parte de um esforço de interpretação da poesia na Grécia antiga como discurso sobre o divino. Aristóteles sobressai dentro da história da consciência filosófica e religiosa grega como erudito, historiador e filósofo. Sem aderir a uma visão dionisíaca de mundo, o filósofo a apresenta como uma forma possível de doação do mundo.

  1. Longitudinal relaxation of mechanically free KH2PO4 type crystals. Piezoelectric resonance and sound attenuation

    Directory of Open Access Journals (Sweden)

    R.R.Levitskii

    2008-09-01

    Full Text Available Within the framework of proton model with taking into account the piezoelectric interaction with the shear strain ε6, a dynamic dielectric response of KD2PO4 type ferroelectrics is considered. Experimentally observed phenomena of crystal clamping by high frequency electric field, piezoelectric resonance and microwave dispersion are described. Ultrasound velocity and attenuation are calculated, peculiarities of their temperature dependence at the Curie points are described. Existence of a cut-off frequency in the frequency dependence of attenuation is predicted.

  2. Phosphorus recovery as AlPO 4 from beneficially reused aluminium sludge arising from water treatment

    OpenAIRE

    Zhao, X.H.; Zhao, Y.Q.; Kearney, P

    2013-01-01

    The purpose of this study was to develop an efficient and, possibly, a practically operated methodology to recover phosphorus (P) from P-saturated dewatered aluminium sludge cakes (DASC) after the DASC have been beneficially reused as constructed wetlands substrate for P-rich wastewater treatment. A three-step procedure of 1) P extraction by H 2SO 4, 2) decolorization of extraction leachate via H 2O 2 oxidation, and 3) AlPO 4 precipitation by pH adjustment, has been explored. The optimal cond...

  3. POLYCICLIC AROMATIC HYDROCARBON CONTAMINATION IN WELS CATFISH (SILURUS GLANIS CAUGHT IN THE PO RIVER BASIN

    Directory of Open Access Journals (Sweden)

    I. Giorgi

    2011-01-01

    Full Text Available Aim of this investigation was to evaluate IPA contamination in samples of Silurus glanis caught in Po river. N. 54 muscle samples were collected and analyzed. Five samples exceeded the maximum limit set by CE Regulation 1881/2006 for Benzo(apirene. Therefore, 10% of Silurus fished turned out to be not adequate and potentially harmful for consumers. In order to estimate the real risk for human health it is necessary to enforce this study, correlating the results with the effective fish consumption.

  4. Uptake of 210Po by aquatic plants of a fresh water ecosystem around the uranium mill tailings management facility of Jaduguda, India.

    Science.gov (United States)

    Jha, V N; Tripathi, R M; Sethy, N K; Sahoo, S K; Puranik, V D

    2013-10-01

    The present study was designed to investigate the uptake of Polonium-210 ((210)Po) by aquatic plants growing in a fresh water ecosystem around the tailings management facility of the uranium industry of Jaduguda, India. Evaluation of the activity concentration of (210)Po in aquatic plants, the concentration ratio of (210)Po from substrate to plants and the relationship of (210)Po with other stable elements were major objectives of the investigation. Based on the habitat, three types of plant were collected and analyzed for (210)Po activity estimation. Along with aquatic plants, effluent, surface water and bottom sediment were also collected and analyzed for (210)Po activity content. From the acid solution (210)Po was electrodeposited on brightly polished silver discs and counted for alpha activity in an alpha counter. The highest (210)Po activity concentration (4884 Bq kg(-1) fresh weight) was found in filamentous algae from residual water of the tailings pond. For sediment-rooted plants, a significant positive correlation (r = 0.91, p plant and sediment activity concentration of (210)Po. For all of the three different groups of plants studied, highly significant correlations were observed between activity concentration of (210)Po and Cu with the significance level variation between 0.00-0.05 (both for linear and log transformed data).

  5. Disease severity and quality of life in children with atopic dermatitis: PO-SCORAD in clinical practice.

    Science.gov (United States)

    Boccardi, Daniela; D'Auria, Enza; Turati, Federica; DI Vito, Michele; Sortino, Sabrina; Riva, Enrica; Cerri, Amilcare

    2017-10-01

    Atopic dermatitis (AD) can significantly compromise the quality of life (QoL). The aim of our investigation was to evaluate whether QoL correlates with AD severity, evaluated through the physician and the patient perspective, in a sample of Italian children. Forty children with AD were evaluated. Disease severity was assessed by the physician and the patients (or their parents) using the SCORAD and the patient-oriented SCORAD (PO-SCORAD) tools, respectively. Patients or their parents completed specific QoL questionnaires (IDQOL/CDLQI). Spearman's correlation coefficient and non-parametric analysis of covariance were used to analyze the data. SCORAD e PO-SCORAD were moderately but significantly correlated (ρ Spearman=0.55, Pchildren with SCORAD>40 had significantly higher QoL scores (more impaired QoL) than those with SCORAD≤40 (median QoL of 5 and 4, respectively, P=0.048). Even higher differences emerged when AD severity was self-assessed (median QoL of 6 and 3.5 for children with PO-SCORAD>40 and PO-SCORAD≤40, respectively, P=0.01). AD children with concomitant food allergy had a significantly more impaired QoL than those with AD only (P=0.040). No significant difference in QoL was observed according to sex or age. In our sample of AD children, QoL appeared slightly-moderately altered, and increasing disease severity was associated with greater impairment in QoL. SCORAD and PO-SCORAD were fairly correlated and the association of QoL was somewhat stronger with the PO-SCORAD than the SCORAD Index. This supports the usefulness of PO-SCORAD for the self-assessment of AD in children, and suggests the importance to integrate physician and patient perspectives in the management of AD.

  6. Why LiFePO4 is a safe battery electrode: Coulomb repulsion induced electron-state reshuffling upon lithiation.

    Science.gov (United States)

    Liu, Xiaosong; Wang, Yung Jui; Barbiellini, Bernardo; Hafiz, Hasnain; Basak, Susmita; Liu, Jun; Richardson, Thomas; Shu, Guojiun; Chou, Fangcheng; Weng, Tsu-Chien; Nordlund, Dennis; Sokaras, Dimosthenis; Moritz, Brian; Devereaux, Thomas P; Qiao, Ruimin; Chuang, Yi-De; Bansil, Arun; Hussain, Zahid; Yang, Wanli

    2015-10-21

    LiFePO4 is a battery cathode material with high safety standards due to its unique electronic structure. We performed systematic experimental and theoretical studies based on soft X-ray emission, absorption, and hard X-ray Raman spectroscopy of LixFePO4 nanoparticles and single crystals. The results clearly show a non-rigid electron-state reconfiguration of both the occupied and unoccupied Fe-3d and O-2p states during the (de)lithiation process. We focus on the energy configurations of the occupied states of LiFePO4 and the unoccupied states of FePO4, which are the critical states where electrons are removed and injected during the charge and discharge process, respectively. In LiFePO4, the soft X-ray emission spectroscopy shows that, due to the Coulomb repulsion effect, the occupied Fe-3d states with the minority spin sit close to the Fermi level. In FePO4, the soft X-ray absorption and hard X-ray Raman spectroscopy show that the unoccupied Fe-3d states again sit close to the Fermi level. These critical 3d electron state configurations are consistent with the calculations based on modified Becke and Johnson potentials GGA+U (MBJGGA+U) framework, which improves the overall lineshape prediction compared with the conventionally used GGA+U method. The combined experimental and theoretical studies show that the non-rigid electron state reshuffling guarantees the stability of oxygen during the redox reaction throughout the charge and discharge process of LiFePO4 electrodes, leading to the intrinsic safe performance of the electrodes.

  7. Synergistic effect of CoPi-hole and Cu(ii)-electron cocatalysts for enhanced photocatalytic activity and photoinduced stability of Ag3PO4.

    Science.gov (United States)

    Wang, Ping; Xu, Shunqiu; Xia, Yang; Wang, Xuefei; Yu, Huogen; Yu, Jiaguo

    2017-04-19

    Recently, Ag 3 PO 4 has been demonstrated to be a new kind of material with high visible-light photocatalytic performance for the decomposition of various organic species. To further improve the photocatalytic activity of Ag 3 PO 4 , hole cocatalyst modification is a promising approach via the rapid transfer of photogenerated holes for effective oxidation reaction. In this work, Co-Pi as a hole cocatalyst was successfully modified on the Ag 3 PO 4 surface by an in situ photodeposition method (referred to as CoPi/Ag 3 PO 4 ). The results showed that the photocatalytic activity of CoPi/Ag 3 PO 4 was greatly improved compared with that of Ag 3 PO 4 . Especially, CoPi/Ag 3 PO 4 (0.3 wt%) reached the highest photocatalytic rate constant (k = 9.2 × 10 -2 min -1 ), a value larger than that of Ag 3 PO 4 (k = 1.4 × 10 -2 min -1 ) by a factor of 6.6. However, it was further found that more accumulated electrons resulted in an obvious deactivation of Ag 3 PO 4 due to the rapid transfer of holes by the Co-Pi cocatalyst, resulting in an obviously decreased photocatalytic performance during repeated tests. To enhance the performance stability of CoPi/Ag 3 PO 4 , the Cu(ii) electron-cocatalyst was further loaded onto its surface to prepare the CoPi-Cu(ii)/Ag 3 PO 4 photocatalyst. The resultant CoPi-Cu(ii)/Ag 3 PO 4 not only indicated a much higher photocatalytic activity than CoPi/Ag 3 PO 4 , but also maintained the excellent stability, which was ascribed to the synergistic effect of Co-Pi as a hole cocatalyst and Cu(ii) as an electron cocatalyst. This work may provide new insight for the development of highly stable and efficient photocatalysts for the degradation of organic pollutants.

  8. Fabrication of RuO2-Ag3PO4 heterostructure nanocomposites: Investigations of band alignment on the enhanced visible light photocatalytic activity.

    Science.gov (United States)

    Dhanabal, Rengasamy; Velmathi, Sivan; Bose, Arumugam Chandra

    2018-02-15

    The RuO2-Ag3PO4 heterostructured nanocomposite was successfully synthesized by facile in situ deposition of porous ruthenium oxide (RuO2) nanoparticles on the surface of the silver phosphate (Ag3PO4). Under visible light irradiation, the 0.5wt.% RuO2-Ag3PO4 heterostructure photocatalyst exhibits enhanced photocatalytic efficiency compared to other composites of RuO2-Ag3PO4 and Ag3PO4. The optimized 0.5wt.% RuO2-Ag3PO4 nanocomposites exhibited 1.5 times enhanced photocatalytic activity towards the degradation of methylene blue (MB) than Ag3PO4. Moreover, the degradation rate of 0.5wt.% RuO2-Ag3PO4 nanocomposite towards the cationic dyes MB and rhodamine B (RhB) was nearly 6.6 times and 4.7 times higher than that towards the anionic dye methyl orange (MO). The formed heterojunction electric field of 310mV at the interface between RuO2 and Ag3PO4 heterostructure induces downward band bending of Ag3PO4. Also, this electric field increases the separation efficiency of electrons-holes resulting higher degradation efficiency. The quenching effect of scavengers test confirms that holes are reactive species and the RuO2-Ag3PO4 nanocomposite is highly stable, exhibited 88% of MB degradation after 4 recycles. The RuO2-Ag3PO4 nanocomposites inhibit self oxidation of Ag3PO4 resulting improved efficiency and stability. Copyright © 2017. Published by Elsevier B.V.

  9. [Responsibility of the physician for blood samples according to paragraph 81 a StPO?].

    Science.gov (United States)

    Blank, J H

    1992-03-01

    On principle no physician is under obligation to take blood-tests prescribed in Art. 81 a StPO (Code of Criminal Procedure). However, this principle is not valid without exception. Hence to be appointed expert by a judge or a public prosecutor shall give the reason for a legal pledge. An indirect obligation--but not to police authorities--may result from a contractually stipulated assumption or from being part of the Public Health Service staff. For the physician being employed in a hospital, the special rule 2 c fig. 3 par. 1 BAT (Federal Employees Tariff Treaty) is valid, which stipulates an obligation to take blood-tests, even if a contractual agreement is missing. Violation of contract and offence against legal pledges may justify giving notice to the physician. However, the obligation of taking blood-tests is not unlimited. Within the pale of law rights of refusal are stated in Art. 22, 24, 52, 72, 74 StPO (Code of Criminal Procedure). Moreover a refusal is justified, if the manoeuvre is injurious to health of the accused under consideration. In this case the physician on the spot taking blood-tests has got the exclusive responsibility, which cannot be shifted on to other authorities. In case of personally justified refusal the physician does not have to expect any prejudices. A physician refusing to take blood-tests does not incur a penalty under Art. 258 or Art. 258 a StGB (Criminal Code).

  10. Effect of reducing agents on low-temperature synthesis of nanostructured LiFePO4

    Science.gov (United States)

    Kulka, Andrzej; Walczak, Katarzyna; Zając, Wojciech; Molenda, Janina

    2017-09-01

    Simple co-precipitation synthesis procedure yielding nanometric LiFePO4 with enhanced electrochemical properties without any post-synthesis heat treatment is presented. XRD, SEM and TEM analysis of the obtained powders revealed platelet crystallites and well crystalized bulk structure. Effective way of decreasing amount of Fe3+ containing phases by addition of reducing agents (KI, (NH4)2S2O3, glucose and the atmosphere of 5%H2-95%Ar) during low-temperature (107 °C) synthesis is described. The traditional analytical chemistry methods or the Mӧssbauer spectroscopy methods revealed that utilization of selected reducing agents diminished Fe3+ concentration from 25 to 12 at%. The constructed cells with optimized LiFePO4 as a cathode material showed superior electrochemical performances, including high reversible capacity up to 162 mAh/g at C/10 current discharge rate, flat voltage plateau with a value close to 3.45 V vs. Li0/+.

  11. Dynamic solubility limits in nanosized olivine LiFePO4.

    Science.gov (United States)

    Wagemaker, Marnix; Singh, Deepak P; Borghols, Wouter J H; Lafont, Ugo; Haverkate, Lucas; Peterson, Vanessa K; Mulder, Fokko M

    2011-07-06

    Because of its stability, nanosized olivine LiFePO(4) opens the door toward high-power Li-ion battery technology for large-scale applications as required for plug-in hybrid vehicles. Here, we reveal that the thermodynamics of first-order phase transitions in nanoinsertion materials is distinctly different from bulk materials as demonstrated by the decreasing miscibility gap that appears to be strongly dependent on the overall composition in LiFePO(4). In contrast to our common thermodynamic knowledge, that dictates solubility limits to be independent of the overall composition, combined neutron and X-ray diffraction reveals strongly varying solubility limits below particle sizes of 35 nm. A rationale is found based on modeling of the diffuse interface. Size confinement of the lithium concentration gradient, which exists at the phase boundary, competes with the in bulk energetically favorable compositions. Consequently, temperature and size diagrams of nanomaterials require complete reconsideration, being strongly dependent on the overall composition. This is vital knowledge for the future nanoarchitecturing of superior energy storage devices as the performance will heavily depend on the disclosed nanoionic properties.

  12. Extraction of Biomolecules Using Phosphonium-Based Ionic Liquids + K3PO4 Aqueous Biphasic Systems

    Science.gov (United States)

    Louros, Cláudia L. S.; Cláudio, Ana Filipa M.; Neves, Catarina M. S. S.; Freire, Mara G.; Marrucho, Isabel M.; Pauly, Jérôme; Coutinho, João A. P.

    2010-01-01

    Aqueous biphasic systems (ABS) provide an alternative and efficient approach for the extraction, recovery and purification of biomolecules through their partitioning between two liquid aqueous phases. In this work, the ability of hydrophilic phosphonium-based ionic liquids (ILs) to form ABS with aqueous K3PO4 solutions was evaluated for the first time. Ternary phase diagrams, and respective tie-lines and tie-lines length, formed by distinct phosphonium-based ILs, water, and K3PO4 at 298 K, were measured and are reported. The studied phosphonium-based ILs have shown to be more effective in promoting ABS compared to the imidazolium-based counterparts with similar anions. Moreover, the extractive capability of such systems was assessed for distinct biomolecules (including amino acids, food colourants and alkaloids). Densities and viscosities of both aqueous phases, at the mass fraction compositions used for the biomolecules extraction, were also determined. The evaluated IL-based ABS have been shown to be prospective extraction media, particularly for hydrophobic biomolecules, with several advantages over conventional polymer-inorganic salt ABS. PMID:20480041

  13. La poética iluminada de la locura: Francisco Matos Paoli contra el imperio

    Directory of Open Access Journals (Sweden)

    María Giulianna Zambrano Murillo

    2017-01-01

    Full Text Available Este artículo propone una exégesis del poema carcelario “Canto de la locura” (1962 del puertorriqueño Francisco Matos Paoli (1915-2000 como una defensa de la locura como posibilidad epistémica y poética liberadora frente a la biopolítica carcelaria y colonial. En los años cincuenta, el nacionalismo puertorriqueño, además de ser proscrito mediante la Ley 53, conocida como la Mordaza, fue estigmatizado como una amenaza delirante a la estabilidad del Gobierno en la isla. Con una voz poética hiperlúcida que desborda los límites del lenguaje, Matos Paoli insiste en la pregunta por la libertad de la isla mientras denuncia la violencia colonial estadounidense. This article proposes a reading of the poem “Canto de la locura” (1962, written by Puerto Rican Francisco Matos Paoli (1915-2000, as defending madness as an epistemic possibility as well as an emancipatory poetics in the face of penitentiary and colonial biopolitics. In the 1950s, Puerto Rican nationalism, in addition to being prohibited by Law 53, known as la Mordaza (Gag Law, was stigmatized as a delirious threat to the stability of the island’s government. With a hyperlucid poetic voice that exceeds the limits of language, Matos Paoli insists on the question of freedom for Puerto Rico while denouncing the colonial violence of the United States.

  14. (137)Cs, (40)K and (210)Po in marine mammals from the southern Baltic Sea.

    Science.gov (United States)

    Ciesielski, Tomasz; Góral, Marta; Szefer, Piotr; Jenssen, Bjørn Munro; Bojanowski, Ryszard

    2015-12-15

    This study provides information on baseline concentrations of the radionuclides Cesium-137, Potassium-40 and Polonium-210 in sea mammals from the Baltic Sea. The radionuclides were analyzed in the liver, kidney and muscle of harbor porpoises, striped dolphins, and gray and ringed seals from the Polish coast by γ- and α-spectrometry. Median (137)Cs activities were 14.8, 13.2 and 23.2 Bq kg(-1) w.w. in the liver, kidney and muscles, respectively. Activities of (40)K and (210)Po in the respective tissues were found to be 79.1, 79.8 and 111 Bq kg(-1) for (40)K and 58.1, 59.2 and 32.9 Bq kg(-1) for (210)Po. The measured (137)Cs concentrations were extraordinarily high in comparison to those reported in sea mammals from other locations. However, dose assessments did not imply health effects from (137)Cs exposure in Baltic Sea mammals. Correlations between (137)Cs tissue activities and reported sea water concentrations highlight the potential use of marine mammals for biomonitoring purposes. Copyright © 2015 Elsevier Ltd. All rights reserved.

  15. Amelia Biagioni o el imprevisible trayecto de una experiencia poética alterna

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    Fernando Nahuel Valcheff García

    2016-01-01

    Full Text Available El presente artículo propone un recorrido de lectura crítica global en torno a los cinco poemarios publicados entre 1954 y 1995 por la escritora argentina Amelia Biagioni (1916 -2000, poniendo especial énfasis en la condición alterna de su obra poética, tanto en relación con las tendencias estéticas dominantes en el campo literario de su época, como en el seno de su propia producción, caracterizada por un doble gesto simultáneo de ruptura y recomposición, de instauración y abolición complementarias. Se espera que el análisis discursivo de sus poemarios, así como de los procedimientos textuales fundamentales que componen su poesía, permita reflexionar acerca de su práctica poética de manera integral, reivindicando el carácter transgresivo/ disruptivo de su escritura con el objetivo de reafirmar, en última instancia, la singularidad de su producción.

  16. La palabra humanizada en la madurez poética de Jaime Siles

    Directory of Open Access Journals (Sweden)

    Cecilia Castro Lee

    2010-06-01

    Full Text Available Este análisis de la poesía de Jaime Siles (Valencia 1951 se concentra en los poemarios, Himnos tardíos (1999 y Pasos en la nieve (2004, considerados por el autor mismo como su madurez poética. Su poesía temprana, de alta calidad estética, culta e intelectual, se orienta hacia la búsqueda de esencias y absolutos de la poesía pura. Los poemarios de su madurez revelan a un nuevo yo poético que toma conciencia de su humanidad. Su nueva poesía, intensamente lírica y rica en recursos estilísticos, ahonda en el misterio del tiempo, el ayer perdido y recobrado por la memoria, la nostalgia y la incertidumbre del ser en el mundo.The focal point of this essay on the poetry of Jaime Siles (Valencia 1951 is the analysis of two books of poetry, Himnos tardios (1999 and Pasos en la Nieve (2004, which the author himself considers his mature work. In his early poetry, Siles seeks purity of form through a learned and intellectual poetic expression of high aesthetic quality and originality. His mature work reveals a new poetic identity concerned with his own human condition. His new poetic voice becomes a lyrical meditation on the perils of humankind, the mystery of time, nostalgia and uncertainty, the loss of the past, death and the beyond.

  17. Myocardial Po2 does not limit aerobic metabolism in the postischemic heart.

    Science.gov (United States)

    Chung, Youngran

    2016-01-15

    Reperfused hypertrophic hearts are prone to develop reflow abnormalities, which are likely to impair O2 return to the myocardium. Yet, reflow deficit may not be the only factor determining postischemic oxygenation in the hypertrophic heart. Altered O2 demand may also contribute to hypoxia. In addition, the extent to which myocardial Po2 dictates energy and functional recovery in the reperfused heart remains uncertain. In the present study, moderately hypertrophied hearts from spontaneously hypertensive rats were subjected to ischemia-reperfusion, and the recovery time courses of pH and high-energy phosphates were followed by (31)P NMR. (1)H NMR measurement of intracellular myoglobin assessed tissue O2 levels. The present study found that the exacerbation of hypoxia in the postischemic spontaneously hypertensive rat heart arises mostly from impaired microvascular supply of O2. However, postischemic myocardial Po2, at least when it exceeds ∼18% of the preischemic level, does not limit mitochondrial respiration and high-energy phosphate resynthesis. It only passively reflects changes in the O2 supply-demand balance. Copyright © 2016 the American Physiological Society.

  18. Carbonate substitution in lead hydroxyapatite Pb5(PO4)3OH

    Science.gov (United States)

    Kwaśniak-Kominek, M.; Manecki, M.; Matusik, J.; Lempart, M.

    2017-11-01

    Synthetic carbonate lead hydroxyapatite Pb5(PO4,CO3)3(OH,CO3) was precipitated from aqueous solution and characterized. The maximum content of CO32- ion in lead apatites does not exceed 2.25 wt%. For precipitation from aqueous solutions this is even lower and controlled by the solubility of cerussite PbCO3. Carbonate substitution occurs simultaneously in two structural positions: at OH- sites (A-type substitution) and at PO43- sites (B-type substitution). This is the most pronounced in FTIR (Fourier Transform Infrared Spectroscopy) spectra at 865 cm-1 and within the range of 1300-1500 cm-1. The substitution results in slight increase of the unit cell parameter a from 9.874 to 9.904 A. The presence of CO32- in two structural positions results in two stages of the release of CO2 upon heating: at 300-350 °C and at 400 °C. The presence of carbonates has little effect on thermal decomposition of lead hydroxyapatite which starts at about 450 °C resulting in the formation of lead pyrophosphate.

  19. Giant suppression of phononic heat transport in a quantum magnet BiCu2PO6

    Science.gov (United States)

    Jeon, Byung-Gu; Koteswararao, B.; Park, C. B.; Shu, G. J.; Riggs, S. C.; Moon, E. G.; Chung, S. B.; Chou, F. C.; Kim, Kee Hoon

    2016-11-01

    Thermal transport of quantum magnets has elucidated the nature of low energy elementary excitations and complex interplay between those excited states via strong scattering of thermal carriers. BiCu2PO6 is a unique frustrated spin-ladder compound exhibiting highly anisotropic spin excitations that contain both itinerant and localized dispersion characters along the b- and a-axes respectively. Here, we investigate thermal conductivity κ of BiCu2PO6 under high magnetic fields (H) of up to 30 tesla. A dip-feature in κ, located at ~15 K at zero-H along all crystallographic directions, moves gradually toward lower temperature (T) with increasing H, thus resulting in giant suppression by a factor of ~30 near the critical magnetic field of Hc ≅ 23.5 tesla. The giant H- and T-dependent suppression of κ can be explained by the combined result of resonant scattering of phononic heat carriers with magnetic energy levels and increased phonon scattering due to enhanced spin fluctuation at Hc, unequivocally revealing the existence of strong spin-phonon coupling. Moreover, we find an experimental indication that the remaining magnetic heat transport along the b-axis becomes almost gapless at the magnetic quantum critical point realized at Hc.

  20. Quasi-Linear Polarized Modes in Y-Rotated Piezoelectric GaPO4 Plates

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    Cinzia Caliendo

    2014-07-01

    Full Text Available The propagation of both surface and flexural acoustic plate modes along y-rotated x-propagation GaPO4 piezoelectric substrates was studied for several y-cut angles: the phase velocity and coupling coefficient dispersion curves were theoretically calculated for two different electroacoustic coupling configurations. The investigation of the acoustic field profile across the plate thickness revealed the presence of thin plate modes having polarization predominantly oriented along the propagation direction, and hence suitable for operation in liquid environment. These modes include the linearly polarized Anisimkin Jr. and the quasi longitudinal plate modes, AMs and QLs, showing a phase velocity close to that of the longitudinal bulk acoustic wave propagating in the same direction. The temperature coefficient of delay (TCD of these longitudinal modes was investigated in the −20 to 420 °C temperature range, in order to identify thermally stable or low TCD cuts. The power flow angle, i.e., the angle between the phase and group velocity vectors, was also estimated to evaluate the substrate anisotropy effect on the acoustic wave propagation. The GaPO4 intrinsic properties, such as its resistance to high temperature and its chemical inertness, make it especially attractive for the development of acoustic waves-based sensors for applications in harsh liquid environment.

  1. The C3PO project: a laser communication system concept for small satellites

    Science.gov (United States)

    d'Humières, Benoît; Esmiller, Bruno; Gouy, Yann; Steck, Emilie; Quintana, Crisanto; Faulkner, Graham; O'Brien, Dominic; Sproll, Fabian; Wagner, Paul; Hampf, Daniel; Riede, Wolfgang; Salter, Michael; Wang, Qin; Platt, Duncan; Jakonis, Darius; Piao, Xiaoyu; Karlsson, Mikael; Oberg, Olof; Petermann, Ingemar; Michalkiewicz, Aneta; Krezel, Jerzy; Debowska, Anna; Thueux, Yoann

    2017-02-01

    The satellite market is shifting towards smaller (micro and nanosatellites), lowered mass and increased performance platforms. Nanosatellites and picosatellites have been used for a number of new, innovative and unique payloads and missions. This trend requires new concepts for a reduced size, a better performance/weight ratio and a reduction of onboard power consumption. In this context, disruptive technologies, such as laser-optical communication systems, are opening new possibilities. This paper presents the C3PO1 system, "advanced Concept for laser uplink/ downlink CommuniCation with sPace Objects", and the first results of the development of its key technologies. This project targets the design of a communications system that uses a ground-based laser to illuminate a satellite, and a Modulating Retro-Reflector (MRR) to return a beam of light modulated by data to the ground. This enables a downlink, without a laser source on the satellite. This architecture suits well to small satellite applications so as high data rates are potentially provided with very low board mass. C3PO project aims to achieve data rates of 1Gbit/s between LEO satellites and Earth with a communication payload mass of less than 1kilogram. In this paper, results of the initial experiments and demonstration of the key technologies will be shown.

  2. Three-dimensional seismo-tectonics in the Po Valley basin, Northern Italy

    Science.gov (United States)

    Turrini, Claudio; Angeloni, Pamela; Lacombe, Olivier; Ponton, Maurizio; Roure, François

    2015-10-01

    The Po Valley (Northern Italy) is a composite foreland-foredeep basin caught in between the Southern Alps and Northern Apennine mountain belts. By integrating the 3D structural model of the region with the public earthquake dataset, the seismo-tectonics of the basin is shown at different scales of observation. The three-dimensional geo-volume is used to review the seismicity around the region and validate the structure-earthquake association for such a complex tectonic framework. Despite the overall uncertainty due to the original data distribution-quality as well as the crustal scale model dimension, the direct correlation between structures and seismicity a) confirms the Po Valley region as an active tectonic system and b) allows the whole structural architecture to be revised by a unique three-dimensional perspective and approach. This study also indicates that 3D methodology is a powerful tool for better understanding of highly complex seismo-tectonic situations at both regional and local scales.

  3. In-beam γ -ray spectroscopy of low- and medium-spin levels in 211Po

    Science.gov (United States)

    Slotte, J. M. K.; Granholm, P.; Öhman, R.; Lönnroth, T.; Juutinen, S.; Suhonen, J.; Jones, P. M.; Julin, R.; Pakarinen, J.; Rahkila, P.; Scholey, C.; Sorri, J.; Uusitalo, J.

    2017-10-01

    The structure of the low- and medium-spin levels of the 211Po nucleus have been studied with in-beam γ -ray spectroscopy with the 208Pb(α ,n )211Po fusion-evaporation reaction. The level scheme was further extended with levels of the configurations π (h9/2) 2+-4+ 2⊗ν g9 /2 , π (h9/2) 8+2⊗ν g9 /2 , π (h9/2) 2+-4+ 2⊗ν i11 /2 , π (h9/2) 2+-4+ 2⊗ν j15 /2 , π (h9/2f7/2) 8+⊗ν g9 /2 , and π (h9/2) 0+2⊗ν (g9/2) 0+2(s1/2) -1 . The single-particle neutron states ν d5 /2 and ν s1 /2 were also identified. Furthermore, a number of states feeding the low-spin structures were added.

  4. Multisensorialidade e sinestesia: poéticas possíveis?

    Directory of Open Access Journals (Sweden)

    Rosangella Leote

    Full Text Available Resumo Pretendo apresentar neste trabalho alguns aspectos da percepção quando esta envolve obras no uso de tecnologias emergentes, tanto para o fazer artístico, como na relação de fruição da obra. Para isto, trago conceitos de modos interativos, bem como multissensoriais, sinestésicos e pseudo sinestésicos. Observo uma problemática sobre a acepção da obra de arte, dentro desta situação poética, em especial quando ela compõe elementos lúdicos, assim como outros elementos de caráter de entretenimento. Encontro apoio para compreender esta problemática, que é de natureza transdisciplinar, em fundamentos de ordem multidisciplinar. Tento, neste discurso, apontar respostas objetivas, embora hipotéticas, uma vez que se referem a uma pesquisa em andamento. Para isto, abordo as relações entre estas figuras, sejam elas a obra, o artista e o interator. Elenco possíveis razões sistêmicas, semióticas e neurocientíficas para um tipo de aproximação entre estas partes que, desde já, coloco como imbricadas. Além disto, demonstro como certas poéticas podem encaminhar à Multisensorialidade sem envolver sinestesia.

  5. Hydrology of the Po River: looking for changing patterns in river discharge

    Directory of Open Access Journals (Sweden)

    A. Montanari

    2012-10-01

    Full Text Available Scientists and public administrators are devoting increasing attention to the Po River, in Italy, in view of concerns related to the impact of increasing urbanisation and exploitation of water resources. A better understanding of the hydrological regime of the river is necessary to improve water resources management and flood protection. In particular, the analysis of the effects of hydrological and climatic change is crucial for planning sustainable development and economic growth. An extremely interesting issue is to inspect to what extent river flows can be naturally affected by the occurrence of long periods of water abundance or scarcity, which can be erroneously interpreted as irreversible changes due to human impact. In fact, drought and flood periods alternatively occurred in the recent past in the form of long-term fluctuations. This paper presents advanced graphical and analytical methods to gain a better understanding of the temporal distribution of the Po River discharge. In particular, we present an analysis of river flow variability and persistence properties, to gain a better understanding of natural patterns, and in particular long-term changes, which may affect the future flood risk and availability of water resources.

  6. Desterrando formas poéticas en la República de Platón.

    Directory of Open Access Journals (Sweden)

    Sergio Ariza.

    2009-12-01

    Full Text Available Este artículo examina un aspecto seminal, pero sorprendente en la crítica de Platón de la poesía: Platón destierra a los contenidos, no sólo particular, y los autores, pero las formas poéticas también ellas mismas, en concreto la forma mimética. El análisis muestra que la principal razón para desterrar tales reside en el hecho de que Platón descubrió que la forma como la forma (con independencia de su contenido tiene un carácter autónomo y se rige por criterios estéticos y no moral. Estos criterios estéticos son incompatibles con la ideología que apoya la polis ideal. Esto pone de relieve el mérito del análisis de Platón de que no está en la evaluación de la actividad poética, sino en la identificación de las puramente estéticas y sus consecuencias sobre el programa político de la República

  7. Main drivers of flood-risk dynamics along the Po River

    Science.gov (United States)

    Domeneghetti, Alessio; Carisi, Francesca; Castellarin, Attilio; Brath, Armando

    2017-04-01

    The increasing frequency with which floods damages are recorded, or reported by media, strengthen the common perception that the flood risk is dramatically increasing in Europe and other areas of the world, due to a combination of different causes, among which climate change is often described as the major factor. However, there is a growing awareness of how anthropogenic pressures, such as uncontrolled urban and industrial expansion on flood-prone areas, may strongly impact the evolution of flood-risk in a given area, increasing potential flood damages and losses. Starting from these considerations, our study aims at shedding some light on the impact and relative importance of different factors controlling the flood risk. Focusing in particular on the middle-lower portion of the River Po, we analyze the evolution of flood hazard in the last half century referring to long streamflow series for different gauging stations located along the study reach ( 450 km), while the modification of anthropogenic pressure is evaluated by referring to land-use and demographic dynamics observed from 1950s. Our study proposes simplified flood-vulnerability indices to be used for large scale flood-risk assessments and, on the basis of these indices, (1) we assess the importance of the different elements contributing to the definition of flood risk and (2) represent the evolution of flood risk in time along the middle and lower portion of the River Po.

  8. The Solar System Radio Explorer Kiosk - Leveraging Other E/PO Programs for Greater Impact

    Science.gov (United States)

    Garcia, L. N.; Reinisch, B. W.; Taylor, W. W.; Thieman, J. R.; Mendez, F.; Riccobono, M.

    2004-12-01

    The Solar System Radio Explorer Kiosk (SSREK) - a newly won small E/PO follow-on to a NASA/OSS research grant - is designed to leverage existing NASA E/PO projects and other education programs to enable a large return from a small investment. The SSREK project will create an interactive museum kiosk to engage and teach visitors about Jupiter and the Sun by learning what their low frequency radio bursts may be telling us about these worlds. This project will work with the network of radio observers and the archive of data obtained through the NASA-sponsored Radio Jove project. The SSREK project is partnering with the Maryland Science Center (MSC) as a test site for the SSREK. The MSC will enable us to ensure that this project meets the requirements of their museum environment. We are also partnering with the National Federation of the Blind (NFB) to help us enable museum visitors with visual impairments to share in the excitement of science and help these visitors recognize how other senses besides sight can be used to do science. Both the MSC and NFB will assist us in formative and summative evaluation of the project. All of the software and designs for the wheelchair-accessible arcade-style cabinet will be made available on the associated web site hosted at NASA/GSFC - further extending the reach of the project.

  9. Characterization of Plasmid pPO1 from the Hyperacidophile Picrophilus oshimae

    Directory of Open Access Journals (Sweden)

    Angel Angelov

    2011-01-01

    Full Text Available Picrophilus oshimae and Picrophilus torridus are free-living, moderately thermophilic and acidophilic organisms from the lineage of Euryarchaeota. With a pH optimum of growth at pH 0.7 and the ability to even withstand molar concentrations of sulphuric acid, these organisms represent the most extreme acidophiles known. So far, nothing is known about plasmid biology in these hyperacidophiles. Also, there are no genetic tools available for this genus. We have mobilized the 7.6 Kbp plasmid from P. oshimae in E. coli by introducing origin-containing transposons and described the plasmid in terms of its nucleotide sequence, copy number in the native host, mode of replication, and transcriptional start sites of the encoded ORFs. Plasmid pPO1 may encode a restriction/modification system in addition to its replication functions. The information gained from the pPO1 plasmid may prove useful in developing a cloning system for this group of extreme acidophiles.

  10. Get Involved in Education and Public Outreach! The Science Mission Directorate Science E/PO Forums Are Here to Help

    Science.gov (United States)

    Shipp, S. S.; Buxner, S.; Schwerin, T. G.; Hsu, B. C.; Peticolas, L. M.; Smith, D.; Meinke, B. K.

    2013-12-01

    NASA's Science Mission Directorate (SMD) Education and Public Outreach (E/PO) Forums help to engage, extend, support, and coordinate the efforts of the community of E/PO professionals and scientists involved in Earth and space science education activities. This work is undertaken to maximize the effectiveness and efficiency of the overall national NASA science education and outreach effort made up of individual efforts run by these education professionals. This includes facilitating scientist engagement in education and outreach. The Forums have been developing toolkits and pathways to support planetary, Earth, astrophysics, and heliophysics scientists who are - or who are interested in becoming - involved in E/PO. These tools include: 1) Pathways to learn about SMD and E/PO community announcements and opportunities, share news about E/PO programs, let the E/PO community know you are interested in becoming involved, and discover education programs needing scientist input and/or support. These pathways include weekly e-news, the SMD E/PO online community workspace, monthly community calls, conferences and meetings of opportunity. 2) Portals to help you find out what education resources already exist, obtain resources to share with students of all levels - from K-12 to graduate students, - and disseminate your materials. These include E/PO samplers and toolkits (sampling of resources selected for scientists who work with students, teachers, and the public), the one-stop shop of reviewed resources from the NASA Earth and space science education portfolio NASAWavelength.org, and the online clearinghouse of Earth and space science higher education materials EarthSpace (http://www.lpi.usra.edu/earthspace). 3) Connections to education specialists who can help you design and implement meaningful E/PO programs - small to large. Education specialists can help you understand what research says about how people learn and effective practices for achieving your goals, place your

  11. General synthesis and morphology control of LiMnPO{sub 4} nanocrystals via microwave-hydrothermal route

    Energy Technology Data Exchange (ETDEWEB)

    Ji Hongmei [Jiangsu Laboratory of Advanced Functional Material, Department of Chemistry, Changshu Institute of Technology, Changshu 215500 (China); Yang Gang, E-mail: gangyang@ua.p [Jiangsu Laboratory of Advanced Functional Material, Department of Chemistry, Changshu Institute of Technology, Changshu 215500 (China); I3N, University of Aveiro, 3810-193 Aveiro (Portugal); Ni Huan; Roy, Soumyajit [Jiangsu Laboratory of Advanced Functional Material, Department of Chemistry, Changshu Institute of Technology, Changshu 215500 (China); Pinto, Joao [I3N, University of Aveiro, 3810-193 Aveiro (Portugal); Jiang Xuefan [Jiangsu Laboratory of Advanced Functional Material, Department of Chemistry, Changshu Institute of Technology, Changshu 215500 (China)

    2011-03-30

    Research highlights: LiMnPO{sub 4} synthesized in 5 min at 180 {sup o}C by MH route. Uniformity nano-platelets obtained under 0.05 M Mn{sup 2+} concentration. Nanoparticle and nanobundle of LiMnPO{sub 4} are controlled by H{sub 3}cit and SDBS respectively. Nanoplatelet morphology of LiMnPO{sub 4} is positive for electrochemistry performance. - Abstract: Olivine structure LiMnPO{sub 4} has been considered as one of the very promising electrodes for lithium-ion batteries because of their low cost, low toxicity and high voltage plateau compared with LiFePO{sub 4}. In order to improve the electrochemical performance a key challenge in the field of lithium-ion battery, is to explore and invent suitable synthetic route to control the size and morphology of LiMnPO{sub 4}. Here a detailed study exploring the novel route of microwave-hydrothermal (MH) synthesis for successfully obtaining LiMnPO{sub 4} crystals within few minutes is reported and the reaction process discussed in detail. Variation of the synthetic parameters show that a decrease in reactant concentration could lead to LiMnPO{sub 4} nano-platelets orientated in the ac plane with a very high electrochemical performance. The effect of the starting precursor (like, Mn) concentration as a means to tailor LiMnPO{sub 4} electrochemical performance is discussed. The effect of alteration of size, morphology, lattice parameters and crystal structure induced by addition of additives like citric acid (H{sub 3}cit) and sodium dodecyl benzene sulfonate (SDBS) is further described and an example of the first reversible discharge of a product treated with H3cit obtained by MH route as high as 89.0 mAh/g, is shown. The general investigation demonstrates that there is a relationship among microwave irradiation condition, crystal structure, morphology and electrochemical performance that can be exploited for the design of next generation lithium batteries.

  12. Quantitative palaeodrainage analysis in the Pleistocene of the Po Plain (Italy)

    Science.gov (United States)

    Vezzoli, G.; Garzanti, E.; Sciunnach, D.

    2009-04-01

    During the Pleistocene, Po Plain deposits recorded repeated waxing and waning of Alpine ice caps, and thus provide an excellent opportunity to investigate the interactions between pronounced climatic fluctuations and background tectonic activity (Scardia et al., 2006), resulting in frequent changes of drainage patterns. A high-resolution Pleistocene stratigraphy, with a complete sedimentological, paleontological, petrographic-mineralogical, magneto-stratigraphic, and seismic data base, was recently obtained from eleven continuous cores drilled in the Lombardy Po Plain north of the Po River (ENI and Regione Lombardia, 2002). In the present study we focus on two cores in the proximal (Cilavegna) and distal plain (Pianengo), which best exemplify the drastic change in sedimentary systems and drainage patterns associated with the onset of major Pleistocene glaciations in the Alps (˜870ky; Muttoni et al., 2003). This climatic event is recorded by a regional unconformity (named R-unconformity by Muttoni et al., 2003), traced all across the Po Basin and encountered at -81 m depth in the Pianengo Core and at -98 m depth in the Cilavegna Core. The Cilavegna Core consists of metamorphiclastic floodplain sediments, capped by the R-unconformity and overlain by quartzofeldspathic braidplain deposits. The Pianengo Core consists of metamorphiclastic deltaic to floodpain sediments, capped by the R-unconformity and overlain by alluvial-fan gravels rich in carbonate pebbles; another unconformity at -39 m depth is overlain by metamorphiclastic braidplain deposits. Our quantitative approach to paleodrainage analysis is based on comprehensive information obtained from modern settings (Garzanti et al., 2004; 2006). End-member modelling and similarity analysis allows us to objectively compare detrital modes from modern and ancient deposits, and to reconstruct the evolution of sediment pathways through geologic time (Vezzoli and Garzanti 2009). The Cilavegna Core documents stepwise south

  13. A vanadium oxy-phosphate Na4VO(PO4)2 as cathode material for Na ion batteries

    Science.gov (United States)

    Deriouche, W.; Anger, E.; Freire, M.; Maignan, A.; Amdouni, N.; Pralong, V.

    2017-10-01

    The Na4VO(PO4)2 phase has been synthesized using a solid state route in sealed tubes. This phase crystallizing in the orthorhombic system has a one-dimensional structure built up of corner shared VO6 and PO4 polyhedra. It is an ionic conductor with a conductivity of 10-4S/cm at 500 K and an activation energy of 0.63eV. The electrochemical properties of Na4VO(PO4)2 as a positive electrode in a sodium ion battery have been studied. Results show the possibility of extracting almost one sodium through a two-phase process at 3.4 V leading to the phase Na3.2VO(PO4)2 and to insert as well one sodium at low potential 1.5 V, to form through a solid solution process the reduced phase Na5VO(PO4)2. This study is a proof of the great versatility of vanadium V3+/V4+/V5+ ions in Na-based batteries.

  14. An electrochemical sensor for determination of calcium dobesilate based on PoPD/MWNTs composite film modified glassy carbon electrode.

    Science.gov (United States)

    Zhang, Xiuhua; Wang, Shimin; Jia, Li; Xu, Zuxun; Zeng, Yu

    2008-04-24

    A poly-o-phenylenediamine and multi-wall carbon nanotubes composite (PoPD/MWNTs) modified glassy carbon electrode (GCE) was prepared by in situ electropolymerization using an ionic surfactant as the supporting electrolyte. The morphology of the resulting PoPD/MWNTs composite was characterized by TEM and the electrochemical properties of the modified electrode were characterized by cyclic voltammetry. The electrochemical behavior of calcium dobesilate on PoPD/MWNTs modified electrode was also investigated. The large current response of calcium dobesilate on PoPD/MWNTs modified electrode is probably caused by the synergistic effect of the electrocatalytic property of PoPD and MWNTs. The reductive peak current increased linearly with the concentration of calcium dobesilate in the range of 0.1-1.0 micromol/L and 4.0-400 micromol/L by square wave adsorptive stripping voltammetry, respectively. The detection limit (three times the signal blank/slope) was 0.035 micromol/L. The modified electrode could eliminate the interference of dopamine, norepinephrine and epinephrine at 100-, 90- and 70-fold concentration of 1.0 micromol/L calcium dobesilate, respectively. The proposed modified electrode provides a new promising and alternative way to detect calcium dobesilate.

  15. Microwave-Assisted Synthesis of Co3(PO42 Nanospheres for Electrocatalytic Oxidation of Methanol in Alkaline Media

    Directory of Open Access Journals (Sweden)

    Prabhakarn Arunachalam

    2017-04-01

    Full Text Available Low-cost and high-performance advanced electrocatalysts for direct methanol fuel cells are of key significance for the improvement of environmentally-pleasant energy technologies. Herein, we report the facile synthesis of cobalt phosphate (Co3(PO42 nanospheres by a microwave-assisted process and utilized as an electrocatalyst for methanol oxidation. The phase formation, morphological surface structure, elemental composition, and textural properties of the synthesized (Co3(PO42 nanospheres have been examined by powder X-ray diffraction (XRD, Fourier transform-infrared spectroscopy (FT-IR, field emission-scanning electron microscopy (FE-SEM, high-resolution transmission electron microscopy (HRTEM, X-ray photoelectron spectroscopy (XPS, and nitrogen adsorption-desorption isotherm investigations. The performance of an electrocatalytic oxidation of methanol over a Co3(PO42 nanosphere-modified electrode was evaluated in an alkaline solution using cyclic voltammetry (CV and chronopotentiometry (CP techniques. Detailed studies were made for the methanol oxidation by varying the experimental parameters, such as catalyst loading, methanol concentration, and long-term stability for the electro-oxidation of methanol. The good electrocatalytic performances of Co3(PO42 should be related to its good surface morphological structure and high number of active surface sites. The present investigation illustrates the promising application of Co3(PO42 nanospheres as a low-cost and more abundant electrocatalyst for direct methanol fuel cells.

  16. Accelerated Removal of Fe-Antisite Defects while Nanosizing Hydrothermal LiFePO4 with Ca(2).

    Science.gov (United States)

    Paolella, Andrea; Turner, Stuart; Bertoni, Giovanni; Hovington, Pierre; Flacau, Roxana; Boyer, Chad; Feng, Zimin; Colombo, Massimo; Marras, Sergio; Prato, Mirko; Manna, Liberato; Guerfi, Abdelbast; Demopoulos, George P; Armand, Michel; Zaghib, Karim

    2016-04-13

    Based on neutron powder diffraction (NPD) and high angle annular dark field scanning transmission electron microscopy (HAADF-STEM), we show that calcium ions help eliminate the Fe-antisite defects by controlling the nucleation and evolution of the LiFePO4 particles during their hydrothermal synthesis. This Ca-regulated formation of LiFePO4 particles has an overwhelming impact on the removal of their iron antisite defects during the subsequent carbon-coating step since (i) almost all the Fe-antisite defects aggregate at the surface of the LiFePO4 crystal when the crystals are small enough and (ii) the concomitant increase of the surface area, which further exposes the Fe-antisite defects. Our results not only justify a low-cost, efficient and reliable hydrothermal synthesis method for LiFePO4 but also provide a promising alternative viewpoint on the mechanism controlling the nanosizing of LiFePO4, which leads to improved electrochemical performances.

  17. Hydrothermal synthesis, evolution, and electrochemical performance of LiMn0.5Fe0.5PO4 nanostructures.

    Science.gov (United States)

    Xiang, Wei; Zhong, Yan-Jun; Ji, Jun-Yi; Tang, Yan; Shen, HuiHui; Guo, Xiao-Dong; Zhong, Ben-He; Dou, Shi Xue; Zhang, Zhi-Ye

    2015-07-28

    LiMn0.5Fe0.5PO4 (LMFP) materials are synthesized by the hydrothermal approach in an organic-free and surfactant-free aqueous solution. The phase and morphological evolution of the material intermediates at different reaction temperatures and times are characterized by XRD, SEM and TEM, respectively. The results show that during temperature increase, the solubility product (Ksp) of the precursors (Li3PO4, Fe3(PO4)2 and (Mn,Fe)3(PO4)2) is the decisive parameter for the precipitation processes. Once the temperature locates at the range of 100-110 °C, the unstable precursors dissolve quickly and then LMFP nuclei are formed, followed by a dissolution-reprecipitation process. As the reaction progresses, the primary particles self-aggregate to form rod or plate particles to reduce the overall surface energy through oriented attachment (OA) and the Ostwald ripening (OR) mechanism. Moreover, the resultant concentration of the precursor significantly affects the crystal size of LMFP by altering the supersaturation degree of solution at the nucleation stage. The carbon coated LMFP nanostructure synthesized at 0.6 mol L(-1) (resultant concentration of PO4(3-)) delivers discharge capacities of 155, 100 and 81 mA h g(-1) at 0.1, 5 and 20 C rate, respectively. The understanding of nanostructural evolution and its influence on the electrochemical performance will pave a way for a high-performance LMFP cathode.

  18. Urea-assisted synthesis of AlPO{sub 4}:Ce,Tb nanorods as a redox luminescence switch

    Energy Technology Data Exchange (ETDEWEB)

    Yang, Wei; Hu, Juncheng, E-mail: hujuncheng@mail.scuec.edu.cn [South-Central University for Nationalities, Key Laboratory of Catalysis and Materials Science of the State Ethnic Affairs Commission and Ministry of Education, Hubei Province (China)

    2013-07-15

    AlPO{sub 4}:Ce,Tb nanorods were synthesized by a facile hydrothermal method. The morphology of rod-like AlPO{sub 4} was tuned by varying urea concentrations, AlPO{sub 4} gradually changed from nanosheets to nanorods, and urea provided hydroxyl anion (OH{sup -}) in the aqueous solution to prepare the dispersed nanorods under the hydrothermal conditions. The emission intensity of nanorods increased significantly compared to that of nanosheets. AlPO{sub 4}:Ce,Tb nanorods provided a novel redox luminescence switch on the basis of the reversible switching of the Ce{sup 3+}/Ce{sup 4+} redox couple. The luminescence is quenched (off) when the system is in the oxidized form while it is restored (on) in the reduced form. The mechanism of the energy transfer and electronic transition between Ce{sup 3+} and Tb{sup 3+} in the AlPO{sub 4} nanorods was also discussed. This switch has biocompatibility and low toxicity, and may have a potential application in biomedical diagnostics and analysis.

  19. Poésie de la lumière, poésie des ténèbres dans La Flûte enchantée de Mozart

    OpenAIRE

    Racault, Jean-Michel

    2016-01-01

    La théâtromanie du siècle explique les nombreuses scènes privées et les fêtes théâtrales et poétiques, qui consacrent une littérature d’usage, sous forme de théâtres privés, de poésies de circonstance et de spectacles divers dans lesquels la poésie de circonstance entretient avec le théâtre de société des rapports privilégiés. En effet, les fêtes et les représentations privées, si fréquentes au xviiie siècle, se conçoivent au sein d’une « société », à des dates significatives, dans un lieu fa...

  20. Surfactant mediated hydrothermal synthesis, characterization and luminescent properties of GdPO{sub 4}: Ce{sup 3+}/Tb{sup 3+} @ GdPO{sub 4} core shell nanorods

    Energy Technology Data Exchange (ETDEWEB)

    Khajuria, Heena; Ladol, Jigmet; Khajuria, Sonika; Shah, Mohd Syed; Sheikh, H.N., E-mail: hnsheikh@rediffmail.com

    2016-08-15

    Highlights: • Core shell nanorods were synthesised by surfactant assisted hydrothermal method. • Morphology of core shell nanorods resembles those of core nanorods indicating coating of shell on cores. • More uniform and non-aggregated core shell nanorods were prepared in presence of surfactants. • Surfactant assisted prepared core shell nanorods show intense emission as compared to uncoated core nanorods. - Abstract: Core shell GdPO{sub 4}: Ce{sup 3+}/Tb{sup 3+} @ GdPO{sub 4} nanorods were synthesized via hydrothermal route in the presence of different surfactants [cetyltrimethyl ammonium bromide (CTAB) and Sodium dodecyl sulphate (SDS)]. The nanorods were characterized by powder X-ray diffraction (PXRD), fourier transform infrared spectroscopy (FTIR), field emission scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM), energy dispersive spectroscopy (EDS) and photoluminescence (PL) studies. The X-ray diffraction results indicate good crystallinity and effective doping in core and core shell nanorods. SEM and TEM micrographs show that all of the as prepared gadolinium phosphate products have rod like shape. The compositional analysis of GdPO{sub 4}: Ce{sup 3+}/Tb{sup 3+} core was done by EDS. The emission intensity of the GdPO{sub 4}: Ce{sup 3+}/Tb{sup 3+} @ GdPO{sub 4} core shell increased significantly with respect to those of GdPO{sub 4}: Ce{sup 3+}/Tb{sup 3+} core nanorods. The effect of surfactant on the uniformity, thickness and luminescence of the core shell nanorods was investigated.

  1. Study of the long-lived excited state in the neutron deficient nuclides $^{195,197,199}$Po by precision mass measurement

    OpenAIRE

    Althubiti, N. A.; Atanasov, D; Blaum, K.; Cocolios, T. E.; Goodacre, T Day; Farooq-Smith, G. J.; Fedorov, D.V.; Fedosseev, V. N.; George, S.; Herfurth, F.; Heyde, K; Kreim, S; Lunney, D.; Lynch, K.M.; Manea, V.

    2017-01-01

    Direct mass measurements of the low-spin $3/2^{(-)}$ and high-spin $13/2^{(+)}$ states in the neutron-deficient isotopes $^{195}$Po, $^{197}$Po, and high-spin $13/2^{(+)}$ state in $^{199}$Po were performed with the Penning-trap mass spectrometer ISOLTRAP at ISOLDE-CERN. These measurements allow the determination of the excitation energy of the isomeric state arising from the $\

  2. NASICON-related Na3.4Mn0.4Fe1.6(PO43

    Directory of Open Access Journals (Sweden)

    Nikolay S. Slobodyanik

    2012-07-01

    Full Text Available The solid solution, sodium [iron(III/manganese(II] tris(orthophosphate, Na3.4Mn0.4Fe1.6(PO43, was obtained using a flux method. Its crystal structure is related to that of NASICON-type compounds. The [(Mn/Fe2(PO43] framework is built up from an (Mn/FeO6 octahedron (site symmetry 3., with a mixed Mn/Fe occupancy, and a PO4 tetrahedron (site symmetry .2. The Na+ cations are distributed over two partially occupied sites in the cavities of the framework. One Na+ cation (site symmetry -3. is surrounded by six O atoms, whereas the other Na+ cation (site symmetry .2 is surrounded by eight O atoms.

  3. Synthesis and luminescence properties of KSrPO{sub 4}:Eu{sup 2+} phosphor for radiation dosimetry

    Energy Technology Data Exchange (ETDEWEB)

    Palan, C. B., E-mail: chetanpalan27@yahoo.in [Department of Physics, Sant Gadge Baba Amravati University, Amravati-444602 (India); Bajaj, N. S. [Toshniwal ACS College, Sengaon, Hingoli-431542 (India); Omanwar, S. K.

    2016-05-06

    The KSrPO{sub 4}:Eu phosphor was synthesized via solid state method. The structural and morphological characterizations were done through XRD (X-ray diffraction) and SEM (Scanning Electronic Microscope). Additionally, the photoluminescence (PL), thermoluminescence (TL) and optically Stimulated luminescence (OSL) properties of powder KSrPO{sub 4}:Eu were studied. The PL spectra show blue emission under near UV excitation. It was advocated that KSrPO{sub 4}:Eu phosphor not only show OSL sensitivity (0.47 times) but also gives faster decay in OSL signals than that of Al{sub 2}O{sub 3}:C (BARC) phosphor. The TL glow curve consist of two shoulder peaks and the kinetics parameters such as activation energy and frequency factors were determined by using peak shape method and also photoionization cross-sections of prepared phosphor was calculated. The radiation dosimetry properties such as minimum detectable dose (MDD), dose response and reusability were reported.

  4. Pravičan i pošten tretman ulaganja u međunarodnom investicijskom pravu

    OpenAIRE

    Babić, Davor

    2012-01-01

    Pošten i pravičan tretman je najvažniji standard zaštite ulaganja u suvremenom međunarodnom pravu . U većini investicijskih arbitraža, na standard se pozivaju tužitelji ili samostalno ili u kombinaciji s drugima standardima zaštite. Istovremeno, pošten i pravičan tretman je najopćenitiji standard zaštite ulaganja. Dok su standardi poput nacionalnog tretmana, tretman najpovlaštenije nacije ili ograničenja od izvlaštenja bar donekle definirani u dosegu, značenja poštenog i pravičnog tretmana je...

  5. Morphology-controlled two-step synthesis and electrochemical studies on hierarchically structured LiCoPO4

    Science.gov (United States)

    Neef, Christoph; Meyer, Hans-Peter; Klingeler, Rüdiger

    2015-10-01

    Olivine structured LiCoPO4 was synthesized by a novel two-step process involving the hydrothermal synthesis of recently discovered metastable tetragonal LiCoPO4tetra and its transformation to the olivine-like phase. The transformation process does not change the size and shape of the particles so that they can be tailored by appropriate choice of the synthesis parameters and addition of organic compounds in the first production step. Our results demonstrate a clear effect of the particle shape on the electrochemical performance. The material shows discharge capacities up to 107 mAh/g for flower-like secondary particles synthesized under the mediation of citric acid. Electrochemical impedance spectroscopy reveals a strong surface reaction during the delithiation process which is key for the capacity fade of LiCoPO4 battery materials and a difference of three orders of magnitude in the diffusion coefficient of lithiated and delithiated species is observed.

  6. Update on the CeC PoP 704 MHz 5-cell cavity cryomodule design and fabrication

    Energy Technology Data Exchange (ETDEWEB)

    Brutus, J. C. [Brookhaven National Lab. (BNL), Upton, NY (United States); Belomestnykh, S. [Brookhaven National Lab. (BNL), Upton, NY (United States); Stony Brook Univ., NY (United States); Ben-Zvi, I. [Brookhaven National Lab. (BNL), Upton, NY (United States); Stony Brook Univ., NY (United States); Grimm, T. [Nioware Inc., Lansing, MI (United States); Huang, Y. [Brookhaven National Lab. (BNL), Upton, NY (United States); Jecks, R. [Nioware Inc., Lansing, MI (United States); Kelly, M. [Argonne National Lab. (ANL), Argonne, IL (United States); Litvinenko, V. [Brookhaven National Lab. (BNL), Upton, NY (United States); Stony Brook Univ., NY (United States); Pinayev, I. [Brookhaven National Lab. (BNL), Upton, NY (United States); Reid, T. [Argonne National Lab. (ANL), Argonne, IL (United States); Skaritka, J. [Brookhaven National Lab. (BNL), Upton, NY (United States); Snydstrup, L. [Brookhaven National Lab. (BNL), Upton, NY (United States); Than, R. [Brookhaven National Lab. (BNL), Upton, NY (United States); Tuozzolo, J. [Brookhaven National Lab. (BNL), Upton, NY (United States); Xu, W. [Brookhaven National Lab. (BNL), Upton, NY (United States); Yancey, J. [Nioware Inc., Lansing, MI (United States); Gerbick, S. [Argonne National Lab. (ANL), Argonne, IL (United States)

    2015-05-03

    A 5-cell SRF cavity operating at 704 MHz will be used for the Coherent Electron Cooling Proof of Principle (CeC PoP) system under development for the Relativistic Heavy Ion Collider (RHIC) at Brookhaven National Laboratory. The CeC PoP experiment will demonstrate the new technique of cooling proton and ion beams that may increase the beam luminosity in certain cases, by as much as tenfold. The 704 MHz cavity will accelerate 2 MeV electrons from a 112 MHz SRF gun up to 22MeV. This paper provides an overview of the design, the project status and schedule of the 704 MHz 5-cell SRF for CeC PoP experiment.

  7. Conductivity and Structure of Superionic Composite (AgI0.6(NaPO30.4

    Directory of Open Access Journals (Sweden)

    E. Kartini

    2005-01-01

    Full Text Available Superionic conductors are of considerable interest from both application and fundamental points of view. Superionic solid electrolytes can be used for batteries, fuel cells and sensors. We have used melt quenching to make a new superionic composite (AgI0.6(NaPO30.4 which exhibits an ionic conductivity of about 2 x 10-4 S/cm at ambient temperature. The conductivity of crystalline AgI and NaPO3 glass are lower of orders of magnitude. (AgI0.6(NaPO30.4 is a composite material containing both crystalline and glass phases. The paper presents the conductivity as a function of temperature measured by impedance spectroscopy and the crystal structure performed by a high resolution powder diffractometer, VEGA at the Neutron Science Laboratory (KENS, KEK, Japan.

  8. The spectroscopic studies of glasses in the BPO 4(GaPO 4)-SiO 2 system

    Science.gov (United States)

    Adamczyk, A.

    2002-09-01

    FTIR spectroscopic structural studies of gel-derived glasses in BPO 4-SiO 2 and BPO 4(GaPO 4)-SiO 2 systems are presented. 10B isotope substitution, spectra subtraction procedure and B 3+→Ga 3+ substitution were applied to distinguish the bands, originating from B-O, P-O and Si-O bond vibrations. The spectra of borophosphosilicate glasses containing 10B isotope have also been presented. Changes in the band positions helped to assign bands due to the different B-O bonds vibrations. The spectra subtraction procedure, due to the lowering of intensity of bands assigned to Si-O bonds vibrations, enabled to observe bands at 966 and 1225 cm -1, due to broken Si-O - bridges and (PO 2) - terminal groups, respectively.

  9. Suitability of the Nanophosphate LiFePO4/C Battery Chemistry for the Fully Electric Vehicle

    DEFF Research Database (Denmark)

    Swierczynski, Maciej Jozef; Stroe, Daniel Ioan; Stan, Ana-Irina

    2014-01-01

    There are currently many different lithium ion chemistries available on the market and several new players are in the research and development process; however, none of them is superior to the other chemistries in all the aspects. Relatively low price, long cycle and calendar lifetime, and intrin...... is used to study the capacity and power capability degradation behaviour of the tested nanophosphate LiFePO4/C battery for two electric vehicle operational scenarios......., and intrinsic safety of the nanophosphate LiFePO4/C lithium ion chemistry make it possible to consider this chemistry for electric vehicle applications. This paper investigates the lifetime of the nanophosphate LiFePO4/C battery chemistry when it is used for full electrical vehicles. The investigation...

  10. LaPO4 Nanoparticles Doped with Actinium-225 that Partially Sequester Daughter Radionuclides

    Energy Technology Data Exchange (ETDEWEB)

    Woodward, Jonathan [ORNL; Kennel, Steve J [ORNL; Stucnkey, Alan [University of Tennessee, Knoxville (UTK); Osborne, Dustin [University of Tennessee, Knoxville (UTK); Wall, Jonathan [University of Tennessee, Knoxville (UTK); Rondinone, Adam Justin [ORNL; Standaert, Robert F [ORNL; Mirzadeh, Saed [ORNL

    2011-01-01

    Nanoscale materials have been envisioned as carriers for various therapeutic drugs, including radioisotopes. Inorganic nanoparticles (NPs) are particularly appealing vehicles for targeted radiotherapy because they can package several radioactive atoms into a single carrier and can potentially retain daughter radioisotopes produced by in vivo generators such as actinium -225 (225Ac, t1/2=10 d). Decay of this radioisotope to stable bismuth-209 proceeds through a chain of short-lived daughters accompanied by the emission of four -particles that release >27 MeV of energy. The challenge in realizing the enhanced cytotoxic potential of in vivo generators lies in retaining the daughter nuclei at the therapy site. When 225Ac is attached to targeting agents via standard chelate conjugation methods, all of the daughter radionuclides are released after the initial -decay occurs. In this work, 225Ac was incorporated into lanthanum phosphate NPs to determine whether the radioisotope and its daughters would be retained within the dense mineral lattice. Further, the 225Ac-doped NPs were conjugated to the monoclonal antibody mAb 201B, which targets mouse lung endothelium through the vasculature, to ascertain the targeting efficacy and in vivo retention of radioisotopes. Standard biodistribution techniques and microSPECT/CT imaging of 225Ac as well as the daughter radioisotopes showed that the NPs accumulated rapidly in mouse lung after intravenous injection. By showing that excess, competing, uncoupled antibodies or NPs coupled to control mAbs are deposited primarily in the liver and spleen, specific targeting of NP-mAb 201B conjugates was demonstrated. Biodistribution analysis showed that ~30% of the total injected dose of La(225Ac)PO4 NPs accumulated in mouse lungs 1 h post-injection yielding a value of % ID/g >200. Furthermore, after 24 h, 80% of the 213Bi daughter produced from 225Ac decay was retained within the target organ and 213Bi retention increased to ~87% at 120 h. In

  11. La poétique et les études du langage : vers l’inconnu

    Directory of Open Access Journals (Sweden)

    Daiane Neumann

    2015-05-01

    Full Text Available La poétique proposée par Henri Meschonnic se construit à partir  de l’épistémologie dans le domaine des études du langage, notamment à  partir de la linguistique de Ferdinand de Saussure et d’Émile Benveniste.  La notion de système chez F. de Saussure et la discussion sur la notion  de rythme, la subjectivité dans le langage, la sémantique sans sémiotique  chez É. Benveniste donnent les bases sur lesquelles se développe cette  théorie. Sans omettre l’historicité de la poétique, ce travail propose de  débattre des questions qu’elle peut poser aux études du langage actuelles,  surtout celles relatives au domaine de la linguistique de l’énonciation et du  discours. C’est le discours qui prime pour la poétique, ce qui amène à un  rapprochement entre les études du langage et les études de la littérature, donc à une modification du point de vue et de l’objet d’étude. Réfléchir à  ce changement de point de vue et aux nouveaux objets que nous pouvons  y trouver c’est ce que nous nous proposons de faire. Henri Meschonnic’s poetics is built considering the  epistemology from language studies, especially from the Linguistics  of Ferdinand de Saussure and Émile Benveniste. The notion of system  established by Saussure and the discussions about rhythm, subjectivity in  language, the semantic without semiotic, proposed by Benveniste are the  basis to this theory. Regarding this historicity, this paper discusses some  questions which can be addressed to the Linguistics of Enunciation and  of Discourse. The study of discourse is primary to poetics. Therefore it  approaches language and literature studies, thus changing the point of  view and the object of study. We propose, in this article, to discuss this  change of point of view and these new objects of study which can arise  from this change.

  12. Po River plume and Northern Adriatic Dense Waters: a modeling and statistical approach.

    Science.gov (United States)

    Marcello Falcieri, Francesco; Benetazzo, Alvise; Sclavo, Mauro; Carniel, Sandro; Bergamasco, Andrea; Bonaldo, Davide; Barbariol, Francesco; Russo, Aniello

    2014-05-01

    The semi enclosed Adriatic Sea, located in the North-Eastern part of the Mediterranean Sea, is a small regional sea strongly influenced by riverine inputs. In its northern shallow sub-basin both the physical and biogeochemical features are strongly influenced by the Po River (together with some other minor ones) through its freshwater plume, by buoyancy changes and nutrients and sediments loads. The major outcomes of this interaction are on primary production, on the rising of hypoxic and anoxic bottom water conditions, on the formation of strong salinity gradients (that influence the water column structure and both coastal and basinwide circulation) and on the formation processes of the Northern Adriatic Dense Water (NAdDW). The NAdDW is a dense water mass that is formed during winter in the shallow Northern Adriatic under buoyancy loss conditions; it then travels southwardly along the Italian coasts reaching the Southern Adriatic after a few months. The NAdDW formation process is mostly locally wind driven but it has been proved that freshwater discharges play an important preconditioning role, starting since the summer previous to the formation period. To investigate the relationship between the Po plume (as a preconditioning factor) and the subsequent dense water formation, the results obtained by a numerical simulation with the Regional Ocean Modelling System (ROMS) have been statistically analyzed. The model has been implemented over the whole basin with a 2 km regular grid, and surface fluxes computed through a bulk fluxes formulation using an high resolution meteorological model (COSMO I7). The only open boundary (the Otranto Strait) is imposed from an operational Mediterranean model (MFS) and main rivers discharges are introduced as a freshwater mass fluxes measured by river gauges closest to the rivers' mouths. The model was run for 8 years, from 2003 to 2010. The Po plume was analysed with a 2x3 Self-Organizing Map (SOM) and two major antithetic patterns

  13. Optimization of Electrochemical Performance of LiFePO4/C by Indium Doping and High Temperature Annealing

    Directory of Open Access Journals (Sweden)

    Ajay Kumar

    2017-10-01

    Full Text Available We have prepared nano-structured In-doped (1 mol % LiFePO4/C samples by sol–gel method followed by a selective high temperature (600 and 700 °C annealing in a reducing environment of flowing Ar/H2 atmosphere. The crystal structure, particle size, morphology, and magnetic properties of nano-composites were characterized by X-ray diffraction (XRD, scanning electron microsopy (SEM, transmission electron microscopy (TEM, and 57Fe Mössbauer spectroscopy. The Rietveld refinement of XRD patterns of the nano-composites were indexed to the olivine crystal structure of LiFePO4 with space group Pnma, showing minor impurities of Fe2P and Li3PO4 due to decomposition of LiFePO4. We found that the doping of In in LiFePO4/C nanocomposites affects the amount of decomposed products, when compared to the un-doped ones treated under similar conditions. An optimum amount of Fe2P present in the In-doped samples enhances the electronic conductivity to achieve a much improved electrochemical performance. The galvanostatic charge/discharge curves show a significant improvement in the electrochemical performance of 700 °C annealed In-doped-LiFePO4/C sample with a discharge capacity of 142 mAh·g−1 at 1 C rate, better rate capability (~128 mAh·g−1 at 10 C rate, ~75% of the theoretical capacity and excellent cyclic stability (96% retention after 250 cycles compared to other samples. This enhancement in electrochemical performance is consistent with the results of our electrochemical impedance spectroscopy measurements showing decreased charge-transfer resistance and high exchange current density.

  14. Distribution and biokinetic analysis of {sup 210}Pb and {sup 210}Po in poultry due to ingestion of dicalcium phosphate

    Energy Technology Data Exchange (ETDEWEB)

    Casacuberta, N., E-mail: Nuria.Casacuberta@uab.es [Departament de Fisica and Institut de Ciencia i Tecnologia Ambientals, Universitat Autonoma de Barcelona, 08193 Bellaterra (Spain); Traversa, F.L. [Departament d' Electronica, Escola Tecnica Superior d' Enginyeria, Universitat Autonoma de Barcelona, 08193 Bellaterra (Spain); Masque, P.; Garcia-Orellana, J. [Departament de Fisica and Institut de Ciencia i Tecnologia Ambientals, Universitat Autonoma de Barcelona, 08193 Bellaterra (Spain); Anguita, M.; Gasa, J. [Departament de Ciencia Animal i dels Aliments, Universitat Autonoma de Barcelona, 08193 Bellaterra (Spain); Garcia-Tenorio, R. [Universidad de Sevilla, Avda. Reina Mercedes s/n, 41012 Sevilla (Spain)

    2010-09-15

    Dicalcium phosphate (DCP) is used as a calcium supplement for food producing animals (i.e., cattle, poultry and pig). When DCP is produced via wet acid digestion of the phosphate rock and depending on the acid used in the industrial process, the final product can result in enhanced {sup 210}Pb and {sup 210}Po specific activities ({approx} 2000 Bq.kg{sup -1}). Both {sup 210}Pb and {sup 210}Po are of great interest because their contribution to the dose received by ingestion is potentially large. The aims of this work are to examine the accumulation of {sup 210}Pb and {sup 210}Po in chicken tissues during the first 42 days of life and to build a suitable single-compartment biokinetic model to understand the behavior of both radionuclides within the entire animal using the experimental results. Three commercial corn-soybean-based diets containing different amounts and sources of DCP were fed to broilers during a period of 42 days. The results show that diets containing enhanced concentrations of {sup 210}Pb and {sup 210}Po lead to larger specific accumulation in broiler tissues compared to the blank diet. Radionuclides do not accumulate homogeneously within the animal body: {sup 210}Pb follows the calcium pathways to some extent and accumulates largely in bones, while {sup 210}Po accumulates to a large extent in liver and kidneys. However, the total amount of radionuclide accumulation in tissues is small compared to the amounts excreted in feces. The single-compartment non-linear biokinetic model proposed here for {sup 210}Pb and {sup 210}Po in the whole animal takes into account the size evolution and is self-consistent in that no fitting parameterization of intake and excretions rates is required.

  15. Photoluminescence properties of the high-brightness Eu3+-doped KNaCa2(PO4)2 phosphors

    Science.gov (United States)

    jin, Cheng; Ma, Hengxin; Liu, Qingbo; Li, Xu; Liu, Pengfei

    2014-03-01

    A series of red-emitting phosphors Eu3+-doped KNaCa2(PO4)2 were synthesized by solid-state reaction, and the photoluminescence (PL) properties were also investigated. The excitation spectrum is composed of charge-transfer (CT) of Eu-O and excitation lines of Eu3+ ions. The strongest excitation lines appeared at 393 nm. The emission spectra of KNaCa2(PO4)2:Eu3+ phosphors exhibit five peaks assigned to the 5D0-7FJ (J = 0, 1, 2, 3, 4) transitions of Eu3+ and have dominating emission peak at 621 nm under 393 nm excitation. The luminescence intensity enhanced with increasing Eu3+ content and the emission reached the maximum intensity at x = 0.02 in KNaCa2-x(PO4)2:xEu3+. The effect of the charge compensators on the emission intensity of the phosphors was investigated. The integral intensity of the emission spectrum of KNaCa1.96(PO4)2:0.02Eu3+, 0.02Na+ excited at 393 nm is about 2.4 times as strong as that of Y2O3:0.05Eu3+ commercial red phosphor. The color coordinates for KNaCa1.96(PO4)2:0.02Eu3+,0.02Na+ were measured. The results indicate that KNaCa2(PO4)2:Eu3+ might be a promising phosphor for w-LEDs.

  16. SYNTHESIS OF HIGHLY CRYSTALLINE OLIVINE-TYPE LiFePO4 NANOPARTICLES BY SOLUTION-BASED REACTIONS

    OpenAIRE

    DONGHAN KIM; JINSUB LIM; EUNSEOK CHOI; JIHYEON GIM; VINOD MATHEW; YOUNKEE PAIK; HONGRYUN JUNG; WANJIN LEE; DOCHEON AHN; SEUNGMIN PAEK; JAEKOOK KIM

    2010-01-01

    LiFePO4 nanocrystals were synthesized in various polyol media without any further post-heat treatment. The LiFePO4 samples synthesized using three different polyol media namely, diethylene glycol (DEG), triethylene glycol (TEG), and tetraethylene glycol (TTEG), exhibited plate and rod-shaped structures with average sizes of 50–500 nm. The X-ray diffraction (XRD) patterns were indexed on the basis of an olivine structure (space group: Pnma). The samples prepared in DEG, TEG, and TTEG polyol me...

  17. De la crítica a la crisis: la poética de Jorge Cuesta

    Directory of Open Access Journals (Sweden)

    Sergio Ugalde

    2014-06-01

    Full Text Available En el presente trabajo se analizan dos de los conceptos fundamentales de la poética de Jorge Cuesta: el romanticismo y el clasicismo. Ambas ideas se ponen en relación con las actividades de polemista y crítico que el escritor veracruzano desempeñó durante los años del México posrevolucionario. Un tercer elemento se discute en estas páginas: el nihilismo que sustenta la reflexión cuestiana en torno al hecho poético.

  18. Neovanguardia chilena y poética del margen en la obra de Juan Luis Martínez

    OpenAIRE

    Vesely Avaria, Carola

    2016-01-01

    [ES]Esta tesis propone una lectura de la obra La nueva novela (1977), del poeta chileno Juan Luis Martínez (1942-1993), desde la óptica de una poética del margen a partir de la cual se reformulan los lenguajes poéticos tradicionales para dar origen a un discurso de corte altamente experimental y, al mismo tiempo, de sustrato sumamente político. Tomando como punto de partida dos metáforas centrales presentes en este libro-objeto, a saber, la casa y el silencio, se analizará un corpus de textos...

  19. Near-infrared emission Ba3(PO4)2:Mn5+ phosphor and potential application in vivo fluorescence imaging

    Science.gov (United States)

    Cao, RenPing; Yu, Xiaoguang; Sun, Xinyuan; Cao, Chunyan; Qiu, JianRong

    2014-07-01

    Fluorescence imaging in the second near-infrared window (NIR-II, 1000-1350 nm) is attracting attention due to negligible tissue scattering and lower tissue autofluorescence, etc. Here, Ba3(PO4)2:Mn5+ phosphor is prepared via solid state reaction method in air, and NIR emission band peaking at ∼1191 nm in the NIR-II region is observed. According to experiment results, Ba3(PO4)2:Mn5+ phosphor has a great potential for the study of the NIR-II fluorescence imaging in vivo.

  20. Deposition and flux of sediment from the Po River, Italy: An idealized and wintertime numerical modeling study

    Science.gov (United States)

    Bever, A.J.; Harris, C.K.; Sherwood, C.R.; Signell, R.P.

    2009-01-01

    Recent studies of sediment dynamics and clinoform development in the northern Adriatic Sea focused on winter 2002-2003 and provided the data and motivation for development of a detailed sediment-transport model for the area near the Po River delta. We used both idealized test cases and more realistic simulations to improve our understanding of seasonal sediment dynamics there. We also investigated the relationship between physical processes and the observed depositional products; e.g. the accumulation of sediment very near the Po River distributary mouths. Sediment transport near the Po River was evaluated using a three-dimensional ocean model coupled to sediment-transport calculations that included wave- and current-induced resuspension, suspended-sediment transport, multiple grain classes, and fluvial input from the Po River. High-resolution estimates from available meteorological and wave models were used to specify wind, wave, and meteorological forcing. Model results indicated that more than half of the discharged sediment remained within 15??km of the Po River distributary mouths, even after two months of intensive reworking by winter storms. During floods of the Po River, transport in the middle to upper water column dominated sediment fluxes. Otherwise, sediment fluxes from the subaqueous portion of the delta were confined to the bottom few meters of the water column, and correlated with increases in current speed and wave energy. Spatial and temporal variation in wind velocities determined depositional patterns and the directions of sediment transport. Northeasterly Bora winds produced relatively more eastward transport, while southwesterly Sirocco winds generated fluxes towards both the north and the south. Eastward transport accounted for the majority of the sediment exported from the subaqueous delta, most likely due to the frequent occurrence of Bora conditions. Progradation of the Po River delta into the Adriatic Sea may restrict the formation of the

  1. Correção de dados de temperatura de fundo de poço (TFP)

    OpenAIRE

    Cavalcante, Anderson Gusmão; Argollo, Roberto Max de; Carvalho, Humberto Da Silva

    2004-01-01

    577 medidas de temperatura de fundo de poço (TFP) oriundas de 207 poços distribuídos pelas bacias sedimentares do Recôncavo, Camamu, Almada, Cumuruxatiba e Jequitinhonha, Bahia, Brasil, foram corrigidas para obter-se as temperaturas estáticas das respectivas formações. A metodologia utilizada para correção destas temperaturas consistiu no uso da Eq.(1) resolvida numericamente quando os dados apresentavam dois ou mais registros de temperatura numa mesma profundidade (método das integrais expon...

  2. Simulação numerica do comportamento mecanico do sal em poços de petroleo

    OpenAIRE

    Carlos Cabral Gravina

    1997-01-01

    Resumo: O problema do fechamento das paredes do poço, ocasionando a prisão da coluna de perfuração ou o colapso dos tubos de revestimento, tem ocorrido quando um poço de petróleo atravessa certos tipos de formações salinas, devido ao pronunciado comportamento plástico dessas e, principalmente, devido ao seu comportamento de fluência ao longo do tempo. O aumento da temperatura e/ou da tensão que agem sobre esses sais acelera e agrava o comportamento de fluência dos mesmos, de tal forma que, qu...

  3. The Solar Dynamics Observatory (SDO) Education and Outreach (E/PO) Program: Changing Perceptions One Program at a Time

    Science.gov (United States)

    Drobnes, Emilie; Littleton, A.; Pesnell, William D.; Beck, K.; Buhr, S.; Durscher, R.; Hill, S.; McCaffrey, M.; McKenzie, D. E.; Myers, D.; hide

    2013-01-01

    We outline the context and overall philosophy for the combined Solar Dynamics Observatory (SDO) Education and Public Outreach (E/PO) program, present a brief overview of all SDO E/PO programs along with more detailed highlights of a few key programs, followed by a review of our results to date, conclude a summary of the successes, failures, and lessons learned, which future missions can use as a guide, while incorporating their own content to enhance the public's knowledge and appreciation of science and technology as well as its benefit to society.

  4. Una aproximación al poema “Arte Poética” de Jorge Luis Borges

    OpenAIRE

    Chaves Salgado, Lorena

    2013-01-01

    Este artículo presenta una lectura del poema 'Arte poética' de Jorge Luis Borges desarrollando aspectos teóricos relacionados con el análisis poético. El poema describe la labor del poeta y que significa escribir poesía, entendido para Borges como un acto y proceso creativo. This article presents a reading of the poem 'Arte Poetica' by Jorge Luis Borges, developing theoretical aspects that relate to the analysis of poetry. ‘Arte Poetica’ describes the work of the poet and what it means to ...

  5. 'Poesía. Revista ilustrada de información poética". Índices 1978 - 1998

    OpenAIRE

    Delgado-Gelabert, J.J. (Juan José)

    2002-01-01

    Índice que recoge los artículos, la poesía, las biografías, los textos, contenidos en los cuarenta y tres números de 'Poesía. Revista Ilustrada de Información Poética', clasificados y distribuidos en diferentes apartados. Index including all the acticles, poetry, biographies, and texts published in the forty three issues of 'Poesía. Revista Ilustrada de Información Poética', classified and sorted in different sections.

  6. Heat capacity and thermodynamic functions of thulium orthophosphate TmPO4 in the range of 10-1350 K

    Science.gov (United States)

    Ryumin, M. A.; Gurevich, V. M.; Khoroshilov, A. V.; Tyurin, A. V.; Gavrichev, K. S.

    2017-12-01

    The heat capacity of TmPO4 in temperature ranges of 9.11-346.05 and 304.6-1344.6 K is measured via adiabatic and differential scanning calorimetry, respectively. The measurement data are used to calculate the temperature dependences of the heat capacity, entropy, change in enthalpy, and reduced Gibbs energy of TmPO4 in the range of 10-1344 K. The Gibbs energy of formation of thulium orthophosphate from elements Δf G 0(298.15 K) is determined.

  7. Andreas Fülberth, „Riga. Kleine Geschichte der Stadt”. Ciekawy przewodnik nie tylko po Rydze, ale także po historii Łotwy

    Directory of Open Access Journals (Sweden)

    Tomasz Kamil Otocki

    2014-12-01

    (1935, old town, which gained a new shape during the thirties. The  Latvinization of the town during the first independence and Sovietization during the occupation (1940-1990 is also an  interesting  fact. The book can be recommended for all readers  who do not have  broad knowledge of the history of Latvia, but it is still a very interesting journey also for those interested in the Baltic states who want to learn about some curiosities from the history of the town. Do you know why the Freedom Monument was not destroyed during the Soviet time? Do you know the history of Riga’s tube that has been never built? Do you know the mathematician Ilja Rips? If not, you should read the book of Andreas Fülberth. Andreas Fülberth, „Riga. Kleine Geschichte der Stadt”. Ciekawy przewodnik nie tylko po Rydze, ale także po historii Łotwy Na początku 2014 roku do rąk czytelnika niemieckiego trafiła książka autorstwa Andreasa Fülbertha „Riga. Kleine Geschichte der Stadt”. Jest to już kolejna niemiecka publikacja o stolicy Łotwy, jednak warto podkreślić, że ostatnią znaczącą pracę ujmującą historię Rygi całościowo wydano w 1897 roku, jeszcze wtedy kiedy Inflanty stanowiły obszar niemieckiego osadnictwa. Niemcy, podobnie jak Polacy, mają problem z holistycznymi opracowaniami na temat Łotwy. Przynależność kraju do Związku Sowieckiego po 1940 roku również i Niemcom utrudniała badania historyczne, w związku z czym byli oni skazani – podobnie jak Polacy na Manteuffla – na opracowania pochodzące jeszcze z przełomu XIX i XX wieku. Książka Andreasa Fülbertha ukazała się w prestiżowym wydawnictwie Böhlau Verlag, które od lat interesuje się historią miast europejskich mających w historii związki z niemczyzną. Od strony warsztatu historycznego autorowi nie można niczego zarzucić. Jest świetnym znawcą historii nie tylko Rygi, ale także regionu, który Niemcy określają jako Baltikum. Napisana językiem naukowym (choć przyst

  8. O Grau Zero na Escrita Poética de Agostinho Neto

    OpenAIRE

    Wendo, Helena

    2009-01-01

    Só me resta dizer que se estivesse diante de meu pai, dir-lhe-ia que o grande mérito de Agostinho Neto não foi o de produzir poesia de qualidade, já que os seus textos não ultrapassam o nível sofrível, mas o facto de ele ter dado à sua mensagem uma estrutura poética a fim de fazer vingar o seu projecto político-ideológico, que culminou com a independência do país aos 11 de Novembro de 1975 e é nesta perspectiva que Neto terá de ser recordado, ou seja, como o Fundador da Nação Angolana, porque...

  9. Manierismo en la poética postnovísima Española

    Directory of Open Access Journals (Sweden)

    Branka Kalenić Ramšak

    1999-12-01

    Full Text Available El término manierismo designa la época artística que en la historia del arte enlaza el Renacimiento con el Barroco; pero también marca una poética, un estilo artístico, ciertos procedimientos artisticos y literarios que pueden aparecer antes o después de la época históricamente determinada como manierista. Esta segunda definición del término es consecuencia de relaciones particulares que el manierismo cultiva hacia la realidad, la tradición y la literatura. De este modo, los temas y los motivos, como también el estilo y la composición manieristas aparecen en varias literaturas del siglo XX, tanto en prosa como en poesía.

  10. Hallucination chez Flaubert : poétique de la perception

    Directory of Open Access Journals (Sweden)

    Tomoko Hashimoto

    2009-01-01

    Full Text Available Notre étude vise à montrer dans le cadre d’une poétique du discours réaliste la manière dont l’« hallucination » fonctionne, se construit et trouve sa signification chez Flaubert. Par quels procédés fait-il surgir des mots le caractère éphémère des images et l’intensité de leur perception ?Notre étude se développera en une forme de triptyque, où le contexte, l’avant-texte et le texte seront examinés. Mais, ces trois points constituant ensemble l’œuvre de Flaubert, nous ne les séparerons pas à...

  11. Collective 2{sup +}{sub 1} excitations in {sup 206}Po and {sup 208,210}Rn

    Energy Technology Data Exchange (ETDEWEB)

    Grahn, T.; Auranen, K.; Herzan, A.; Jakobsson, U.; Julin, R.; Konki, J.; Peura, P.; Rahkila, P.; Stolze, S. [Department of Physics, University of Jyvaskyla (Finland); Helsinki Institute of Physics, Helsinki (Finland); Pakarinen, J. [Department of Physics, University of Jyvaskyla (Finland); Helsinki Institute of Physics, Helsinki (Finland); CERN-ISOLDE, PH Department, CERN, Geneva (Switzerland); Jokiniemi, L.; Suhonen, J. [Department of Physics, University of Jyvaskyla (Finland); Albers, M.; Blazhev, A.; Lewandowski, L.; Moschner, K.; Pfeiffer, M.; Radeck, D.; Reiter, P.; Rudiger, M.; Seidlitz, M.; Siebeck, B.; Steinbach, T.; Thoele, P.; Warr, N.; Vogt, A. [Universitaet zu Koeln, Institut fuer Kernphysik, Koeln (Germany); Bauer, C.; Boenig, S.; Kroell, T.; Thuerauf, M. [TU Darmstadt, Institut fuer Kernphysik, Darmstadt (Germany); Bernards, C. [Yale University, Wright Nuclear Structure Laboratory, New Haven, CT (United States); Butler, P.A. [University of Liverpool, Department of Physics, Oliver Lodge Laboratory, Liverpool (United Kingdom); Damyanova, A. [Universite de Geneve (Switzerland); Coster, T. de; Witte, H. de; Elseviers, J.; Huyse, M.; Kesteloot, N.; Reynders, K.; Sambi, S.; Wrzosek-Lipska, K. [Department of Physics, Instituut voor Kern- en Stralingsfysica, Leuven (Belgium); Gaffney, L.P. [University of Liverpool, Department of Physics, Oliver Lodge Laboratory, Liverpool (United Kingdom); Department of Physics, Instituut voor Kern- en Stralingsfysica, Leuven (Belgium); University of the West of Scotland, School of Engineering, Paisley (United Kingdom); Rapisarda, E.; Duppen, P. van [Department of Physics, Instituut voor Kern- en Stralingsfysica, Leuven (Belgium); CERN-ISOLDE, PH Department, CERN, Geneva (Switzerland); Salsac, M.D.; Zielinska, M. [CEA-Saclay, Gif-sur-Yvette (France); Scheck, M. [TU Darmstadt, Institut fuer Kernphysik, Darmstadt (Germany); University of the West of Scotland, School of Engineering, Paisley (United Kingdom); Venhart, M.; Veselsky, M. [Slovak Academy of Sciences, Institute of Physics, Bratislava 45 (Slovakia); Vermeulen, M.J. [University of York, Department of Physics, York (United Kingdom); Werner, V. [TU Darmstadt, Institut fuer Kernphysik, Darmstadt (Germany); Yale University, Wright Nuclear Structure Laboratory, New Haven, CT (United States)

    2016-11-15

    In the present study, B(E2; 2{sup +}{sub 1} → 0{sup +}{sub 1}) values have been measured in the {sup 208,210}Rn and {sup 206}Po nuclei through Coulomb excitation of re-accelerated radioactive beams in inverse kinematics at CERN-ISOLDE. These nuclei have been proposed to lie in, or at the boundary of the region where the seniority scheme should persist. However, contributions from collective excitations are likely to be present when moving away from the N = 126 closed shell. Such an effect is confirmed by the observed increased collectivity of the 2{sup +}{sub 1} → 0{sup +}{sub 1} transitions. Experimental results have been interpreted with the aid of theoretical studies carried out within the BCS-based QRPA framework. (orig.)

  12. Coulomb excitation of re-accelerated 208Rn and 206Po beams

    Directory of Open Access Journals (Sweden)

    Grahn T.

    2013-12-01

    Full Text Available In the present study, B(E2; 2+ → 0+ values have been measured in the 208Rn and 206Po nuclei through Coulomb excitation of re-accelerated radioactive beams in inverse kinematics at CERN-ISOLDE. The resulting B(E2; 2+ → 0+ in 208Rn is ∼ 0.08 e2b2. These nuclei lie in, or at the boundary of the region where seniority scheme should persist. However, contributions from collective excitations may be present when moving away from the N = 126 shell closure. To date, surprisingly little is known of the transition probabilities between the low-spin states in this region.

  13. Guillermo Carnero, Dibujo de la muerte: Obra poética 1966-1990

    OpenAIRE

    Molina Delicado, María

    2013-01-01

    «Lo que sí es innegable es que la “pesadilla estética” anunciaba un cambio y que éste se ha producido más como ruptura que como evolución», dijo José María Castellet allá sobre los años 70 en Nueve Novísimos poetas españoles, la obra que encumbraría a los jóvenes que representaron el nacimiento de una nueva generación en la poesía. Dibujo de la muerte. Obra poética, el libro-antología de Guillermo Carnero –uno de los novísimos de Castellet nacido en Valencia en 1947– ante el que nos encontram...

  14. Rietveld refinement of langbeinite-type K2YHf(PO43

    Directory of Open Access Journals (Sweden)

    Nikolay S. Slobodyanik

    2009-08-01

    Full Text Available Potassium yttrium hafnium tris(orthophosphate belongs to the langbeinite-family and is built up from [MO6] octahedra [in which the positions of the two independent M sites are mutually occupied by Y and Hf in a 0.605 (10:0.395 (10 ratio] and [PO4] tetrahedra connected via vertices into a three-dimensional framework. This framework is penetrated by large closed cavities in which the two independent K atoms are located; one of the K atoms is nine-coordinated and the other is 12-coordinated by surrounding O atoms. The K, Y and Hf atoms lie on threefold rotation axes, whereas the P and O atoms are located in general positions.

  15. Poéticas de lo cotidiano, estéticas de la vida

    Directory of Open Access Journals (Sweden)

    Francisco Javier Gil

    2017-01-01

    Full Text Available El artículo intenta ofrecer una relexión acerca del lugar del arte y lo sensible como espacios para airmar la vida como potencia. A partir de esa aproximación conceptual, se plantean las decisiones curatoriales tomadas para celebrar la exposición “Poéticas de lo cotidiano, estéticas de la vida”. Dicha exposición tuvo lugar en el Museo de Artes Visuales de la Universidad Jorge Tadeo Lozano, en ésta ciertos ejes conceptuales se trabajaron al unísono con la selección de obras y prácticas culturales. El texto intenta señalar cómo se pensaron esas relaciones.

  16. {sup 210}Pb and {sup 210}Po as tracers of particle transport mechanisms on continental margins

    Energy Technology Data Exchange (ETDEWEB)

    Radakovitch, O.; Heussner, S. [Perpignan Univ., 66 (France). Lab. de Sedimentologie et Geochimie Marines; Biscaye, P.; Abassi, A. [Columbia Univ., Palisades, NY (United States). Lamont Doherty Earth Observatory

    1997-12-31

    The natural radionuclides {sup 210}Po and {sup 210}Pb, members of the {sup 238}U decay chain, are particularly helpful to the understanding of particle transport processes in the ocean. These isotopes were analysed on sediment trap particles collected during 3 one-year experiments on continental margins. In the Bay of Biscay (Northeastern Atlantic) and in the Gulf of Lion (Northwestern Mediterranean Sea) both as part of the French ECOMARGE programme, and in the Middle Atlantic Bight (Northwestern Atlantic) as part of the SEEP programme. They yielded great insights into scenarios of particle transfer at each site, mainly based on the spatial and temporal distribution of {sup 210}Pb particulate concentrations and fluxes. (author) 11 refs.

  17. Complete genome sequence of Marinomonas posidonica type strain (IVIA-Po-181T)

    Science.gov (United States)

    Lucas-Elío, Patricia; Goodwin, Lynne; Woyke, Tanja; Pitluck, Sam; Nolan, Matt; Kyrpides, Nikos C.; Detter, Janine C.; Copeland, Alex; Lu, Megan; Bruce, David; Detter, Chris; Tapia, Roxanne; Han, Shunsheng; Land, Miriam L.; Ivanova, Natalia; Mikhailova, Natalia; Johnston, Andrew W. B.; Sanchez-Amat, Antonio

    2012-01-01

    Marinomonas posidonica IVIA-Po-181T Lucas-Elío et al. 2011 belongs to the family Oceanospirillaceae within the phylum Proteobacteria. Different species of the genus Marinomonas can be readily isolated from the seagrass Posidonia oceanica. M. posidonica is among the most abundant species of the genus detected in the cultured microbiota of P. oceanica, suggesting a close relationship with this plant, which has a great ecological value in the Mediterranean Sea, covering an estimated surface of 38,000 Km2. Here we describe the genomic features of M. posidonica. The 3,899,940 bp long genome harbors 3,544 protein-coding genes and 107 RNA genes and is a part of the Genomic Encyclopedia of Bacteria and Archaea project. PMID:23458837

  18. Complete genome sequence of Marinomonas posidonica type strain (IVIA-Po-181T)

    Energy Technology Data Exchange (ETDEWEB)

    Lucas-Elio, Patricia [University of Murcia, Murcia, Spain; Goodwin, Lynne A. [Los Alamos National Laboratory (LANL); Woyke, Tanja [U.S. Department of Energy, Joint Genome Institute; Pitluck, Sam [U.S. Department of Energy, Joint Genome Institute; Nolan, Matt [U.S. Department of Energy, Joint Genome Institute; Kyrpides, Nikos C [U.S. Department of Energy, Joint Genome Institute; Detter, J C [U.S. Department of Energy, Joint Genome Institute; Copeland, A [U.S. Department of Energy, Joint Genome Institute; Lu, Megan [Los Alamos National Laboratory (LANL); Bruce, David [Los Alamos National Laboratory (LANL); Detter, J. Chris [U.S. Department of Energy, Joint Genome Institute; Tapia, Roxanne [Los Alamos National Laboratory (LANL); Han, Cliff [Los Alamos National Laboratory (LANL); Land, Miriam L [ORNL; Ivanova, N [U.S. Department of Energy, Joint Genome Institute; Mikhailova, Natalia [U.S. Department of Energy, Joint Genome Institute; Johnston, Andrew W. B. [University of East Anglia, Norwich, United Kingdom; Sanchez-Amat, Antonio [University of Murcia, Murcia, Spain

    2012-01-01

    Marinomonas posidonica IVIA-Po-181T Lucas-Eli o et al. 2011 belongs to the family Oceanospirillaceae within the phylum Proteobacteria. Different species of the genus Marinomonas can be readily isolated from the seagrass Posidonia oceanica. M. posidonica is among the most abundant species of the genus detected in the cultured microbiota of P. oceanica, suggesting a close relationship with this plant, which has a great ecological value in the Mediterranean Sea, covering an estimated surface of 38,000 Km2. Here we describe the genomic features of M. posidonica. The 3,899,940 bp long genome harbors 3,544 pro- tein-coding genes and 107 RNA genes and is a part of the Genomic Encyclopedia of Bacteria and Archaea project.

  19. Complete genome sequence of Marinomonas posidonica type strain (IVIA-Po-181(T)).

    Science.gov (United States)

    Lucas-Elío, Patricia; Goodwin, Lynne; Woyke, Tanja; Pitluck, Sam; Nolan, Matt; Kyrpides, Nikos C; Detter, Janine C; Copeland, Alex; Lu, Megan; Bruce, David; Detter, Chris; Tapia, Roxanne; Han, Shunsheng; Land, Miriam L; Ivanova, Natalia; Mikhailova, Natalia; Johnston, Andrew W B; Sanchez-Amat, Antonio

    2012-10-10

    Marinomonas posidonica IVIA-Po-181(T) Lucas-Elío et al. 2011 belongs to the family Oceanospirillaceae within the phylum Proteobacteria. Different species of the genus Marinomonas can be readily isolated from the seagrass Posidonia oceanica. M. posidonica is among the most abundant species of the genus detected in the cultured microbiota of P. oceanica, suggesting a close relationship with this plant, which has a great ecological value in the Mediterranean Sea, covering an estimated surface of 38,000 Km(2). Here we describe the genomic features of M. posidonica. The 3,899,940 bp long genome harbors 3,544 protein-coding genes and 107 RNA genes and is a part of the GenomicEncyclopedia ofBacteriaandArchaea project.

  20. A review of radio chemical analysis and estimation of 210Po in soil matrices

    Directory of Open Access Journals (Sweden)

    N.K. Sethy

    2015-10-01

    Full Text Available The naturally occurring radionuclide 210Po, arising from the uranium–radium decay series, provides a considerable contribution to the radiation exposure to humans. Polonium is analyzed for a variety of purposes, including for radiological impact assessment or as a tracer of environmental processes. Losses of polonium may occur at temperatures above 100 °C, depending on conditions, requiring particular care in sample preparation and treatment. There has been little development regarding analysis of polonium in environmental samples since 1960 as radiochemical analysis of polonium is quite straight forward due to easy of source preparation through auto-deposition on to metal surfaces. In this paper a brief review of estimation of polonium in the soil samples have given emphasis.

  1. Roman Jakobson: el lugar de la función poética

    OpenAIRE

    Jurado Valencia, Fabio; Investigador en el Seminario de Poética de la UNAM. En la actualidad pro­fesor de Literatura, Lingüística y Semiología en las Universidades Javeriana, Exter­nado de Colombia y Nacional

    2004-01-01

    1. Paralelismo y equivalencia poética, según Jakobson El célebre ensayo de Jakobson sobre "La nueva poesía rusa", expuesto y debatido en el año de 1919 en el seno del Círculo lingüístico de Moscú, constituye el aporte más importante a las primeras fundamentaciones en teo­ría literaria de la corriente formalista. A partir de este trabajo, las reflexiones del "formalismo" se orientarán, definitivamente, hacia la búsqueda de los instrumentos necesarios para la construcción de una disciplina —la ...

  2. Urbānisms Aleksandra Čaka un Vladimira Majakovska poēzijā.

    OpenAIRE

    Tihanova, Marija

    2013-01-01

    Urbānisms Aleksandra Čaka un Vladimira Majakovska poēzijā: bakalaura darbs. – Rīga, 2013. – 59 lpp. Šis pētnieciskais darbs ir veltīts Aleksandra Čaka un Vladimira Majakovska urbānistiskai dzejai. Darbā tiek apskatīts materiāls par urbānismu modernisma literatūrā, analizēts pilsētas tēls dzejnieku-urbānistu Majakovska un Čaka daiļradē, noskaidrots, kādā veidā Majakovska dzejiskā tradīcija ir ietekmējusi Čaka pilsētas dzeju. Analīzei tika izvēlēta Vladimira Majakovska urbānistiskā dzeja,...

  3. High temperature electrochemical performance of nanosized LiFePO{sub 4}

    Energy Technology Data Exchange (ETDEWEB)

    Mestre-Aizpurua, F.; Palacin, M.R. [Institut de Ciencia de Materials de Barcelona (ICMAB-CSIC), Campus UAB E-08193, Bellaterra, Catalonia (Spain); Hamelet, S.; Masquelier, C. [Laboratoire de Reactivite et de Chimie des Solides, CNRS UMR 6007, Universite de Picardie Jules Verne, 33 Rue St. Leu, 80039 Amiens Cedex 9 (France)

    2010-10-01

    The electrochemical performance of LiFePO{sub 4} was tested at temperatures up to 150 C for micrometric and nanometric size samples. Among the latter, both highly defective samples obtained by direct precipitation and annealed samples were tested. The comparison of voltage composition profiles for these samples coupled to GITT experiments allowed to conclude that defects seem to be the major factor in inducing the solid solution behaviour at room temperature. Good capacity retention is exhibited upon prolonged cycling at 100 C in EC LiBOB electrolyte, also for nanosized samples that still maintain 75% of the initial capacity after 170 cycles. These results prove that the enhanced thermal stability of such electrolytes can be extended to temperatures much higher than those usually tested. (author)

  4. « Métamorphoses du poème »

    OpenAIRE

    Bencheikh, Jamel-Eddine

    2017-01-01

    (…) Le poème est un lieu d’échanges. Rien ne le montre mieux que la correction d’un texte, ce travail que l’écriture vous impose de faire sur elle-même. Appel de nécessité : de l’ébauche au texte final se dessine une trajectoire du franchissement. Si je relis des lignes écrites la veille ou quelque temps auparavant, une chose m’apparaît immédiatement, il y a des mots qui n’y sont pas à leur place. Je ne parle pas des facilités, des futilités ou des inadvertances, je désigne les mots qui, pour...

  5. Quantum Oscillation Studies of the Fermi Surface of LaFePO

    Energy Technology Data Exchange (ETDEWEB)

    Carrington, A.

    2010-05-26

    We review recent experimental measurements of the Fermi surface of the iron-pnictide superconductor LaFePO using quantum oscillation techniques. These studies show that the Fermi surface topology is close to that predicted by first principles density functional theory calculations, consisting of quasi-twodimensional electron-like and hole-like sheets. The total volume of the two hole sheets is almost equal to that of the two electron sheets, and the hole and electron Fermi surface sheets are close to a nesting condition. No evidence for the predicted three dimensional pocket arising from the Fe d{sub z}{sup 2} band is found. Measurements of the effective mass suggest a renormalisation of around two, close to the value for the overall band renormalisation found in recent angle resolved photoemission measurements.

  6. Redetermination of the hexagonal struvite analogue Cs[Mg(OH26](PO4

    Directory of Open Access Journals (Sweden)

    Matthias Weil

    2008-08-01

    Full Text Available The structure of the hexagonal modification of caesium hexaaquamagnesium phosphate has been redetermined from single-crystal X-ray data. The previous refinement from photographic data [Ferrari, Calvaca & Nardelli (1955. Gazz. Chim. Ital. 85, 1232–1238] was basically confirmed, but with all H atoms located and with all non H-atoms refined with anisotropic displacement parameters. The structure can be derived from the NiAs structure type: the PO4 tetrahedra (3m. symmetry are on the Ni positions and the complex [Mg(OH26] octahedra (3m. symmetry are on the As positions. The building units are connected to each other by hydrogen bonds. The Cs+ cations (3m. symmetry are located in the voids of this arrangement and exhibit a distorted cuboctahedral 12-coordination by the O atoms of the water molecules.

  7. Mapa de peligros del volcán Poás

    Directory of Open Access Journals (Sweden)

    Gustavo Barrantes Castillo

    2015-08-01

    Full Text Available The Poás volcano presents a series of hazards to the lives and activities of the communities in its surroundings; these hazards include ash fall, volcanic gases, ballistic projection, pyroclastic flows, lahars and lava flows. In the study described in this article, risks were zoned and integrated to form combined hazard maps for later use in territorial planning processes. With respect to methodology, the study was based on a heuristic approximation, which was supported with cartographic, geomorphological, and historical impact criteria to achieve a suitable product in terms of scale and ease of interpretation. These maps present greater detail and integration than other works and cartographies of volcanic hazards in Costa Rica.

  8. Field-induced magnetic phases and electric polarization in LiNiPO4

    DEFF Research Database (Denmark)

    Jensen, Thomas Bagger Stibius; Christensen, Niels Bech; Kenzelmann, M.

    2009-01-01

    Neutron diffraction is used to probe the (H,T) phase diagram of magnetoelectric (ME) LiNiPO4 for magnetic fields along the c axis. At zero field the Ni spins order in two antiferromagnetic phases. One has commensurate (C) structures and general ordering vectors k(C)=(0,0,0); the other one...... is incommensurate (IC) with k(IC)=(0,q,0). At low temperatures the C order collapses above mu H-0=12 T and adopts an IC structure with modulation vector parallel to k(IC). We show that C order is required for the ME effect and establish how electric polarization results from a field-induced reduction in the total...

  9. Falsa interface como recurso poético na obra interativa

    Directory of Open Access Journals (Sweden)

    Milton Terumitsu Sogabe

    Full Text Available Resumo O conceito de "falsa interface" nasce da observação e produção de instalações interativas mediadas pela tecnologia digital. A "falsa interface" não é uma interface tecnológica que permite ao público a interação com um sistema digital, mas é um recurso poético, geralmente um aparato ou objeto artesanal com o qual o público interage com a obra de arte, que é um sistema. A "falsa interface" apresenta uma relação física, uma conexão com uma interface tecnológica. O público se relaciona ludicamente com a falsa interface e a interface tecnológica passa despercebida, em segundo plano, embora seja ela que capte e envie para o sistema a atuação do público.

  10. Voyage et initiation poétique : l’aventure de Keats en 1818

    Directory of Open Access Journals (Sweden)

    Florence GAILLET–DE CHEZELLES

    2005-06-01

    Full Text Available Durant l’été 1818, John Keats partit sillonner le Nord de l’Angleterre et l’ouest de l’Écosse en compagnie de son ami Charles Brown. Ravi à l’idée de vivre des sensations nouvelles, le jeune poète percevait ce voyage comme une étape importante dans sa vie, qu’il entendait désormais consacrer à l’écriture et à la formation de son esprit, comme le révèle cette évocation enthousiaste :I purpose within a Month to put my knapsack at my back and make a pedestrian tour through the North of England, ...

  11. Human skeletal uptake of natural alpha radioactivity from {sup 210}Pb-supported {sup 210}Po

    Energy Technology Data Exchange (ETDEWEB)

    Oyedepo, A.C

    1998-06-01

    This thesis contributes to increasing knowledge on the dosimetry of natural alpha-particle radiation in skeletal tissues, particularly in utero, and associated risks of malignancy. Alpha-particle radiation is an established aetiological factor of cancer. In the human body, polonium-210 decayed from skeletal lead-210 ({sup 210}Pb/{sup 210}Po) is the predominant natural alpha-emitter. {sup 210}Pb displaces calcium (Ca) in mineral hydroxyapatite, especially during periods of rapid bone growth and remodelling when Ca is laid down. It was therefore necessary to study alpha activity uptake and calcification concurrently within bone. Human studies were undertaken on: fetal vertebrae, 17 - 42 weeks of gestation, 74 samples; adult vertebrae, 40 - 95 years, 40 samples; and adult ribs, 20 - 95 years, 51 samples. Specimens were unconcentrated and weighed <5 g each. TASTRAK alpha-particle autoradiography was used to assess the bone activity concentration and spatial microdistribution of {sup 210}Pb/{sup 210}Po. Alpha track data were resolved by specially written software named SPATS (Selection Program for Analysing Track Structures). Ca and phosphorus (P) were biochemically determined. Results were examined for trends in bone type, gender and chronological ageing in humans. The main research findings were: 1) The Ca content of fetal vertebrae increased linearly at a weekly rate of 0.2g Ca 100 g{sup -1} wet bone (typical values of 2, 4, 6 g 100 g{sup -1} at 16, 26 and 36 weeks). 2) The P concentration also increased with advancing fetal age. 3) The Ca:P bone weight ratio rose from 1.7 to 2.2 by 32 gestational weeks. 4) The overall range in bone {sup 210}Pb/{sup 210}Po alpha activity was 0.25 - 1.1 Bq kg{sup -1} with correlation between activity concentration and fetal age (0.47 {+-} 0.05 Bq kg{sup -1} for 17 - 26 weeks, 0.67 {+-} 0.04 Bq kg{sup -1} for 32 - 42 weeks). 5) The correlation between increased alpha radioactivity and increased Ca concentration approximating to 0

  12. La poética del instante. Javier Cercas y su historia de un fracaso

    OpenAIRE

    Luis María Romeu Guallart

    2011-01-01

    El trabajo aborda el análisis de un importante libro español (¿novela?, ¿crónica?…) de los últimos años: Anatomía de un instante de Javier Cercas, que narra lo acontecido en el Golpe de Estado del 23 de febrero de 1981. La abundancia, la saturación, de materiales históricos, presentados desde una enorme multiplicidad de perspectivas, llevan al lector no sólo a cuestionarse acerca del género mismo del libro que tiene entre manos, sino a reflexionar sobre el origen mismo de estas poéticas y su ...

  13. Phase transitions in Cs5(HSO4)2(H2PO4)3 crystal

    Science.gov (United States)

    Grebenev, V. V.; Makarova, I. P.; Ksenofontov, D. A.; Komornikov, V. A.; Dmitricheva, E. V.

    2013-11-01

    The symmetry (sp. gr. I 3 d) and lattice parameters have been determined for the first time for Cs5(H2SO4)2(H2PO4)3 crystals in the temperature range from 172 to 390 K. The thermal and optical properties of crystals, as well as their conductivity, have been investigated at elevated temperatures. It is shown that a crystal heated to T = 365 K undergoes a phase transition with symmetry lowering to the tetragonal phase (with the parameters a = 4.965(1) Å and c = 5.016(1) Å), while at T ≈ 390 K a phase transition to the cubic phase is presumably observed. With a decrease in temperature, a phase transition without a change in symmetry occurs at T = 240 K.

  14. Sonetos de uma palavra, de Seymour Mayne: fragmentos e expansões poéticas

    Directory of Open Access Journals (Sweden)

    Alexandre Daniel de S. Feldman

    2013-10-01

    Full Text Available O Word Sonnet, traduzido por Soneto de uma palavra, é uma variante da forma tradicional de soneto. Há críticos que são completamente contrários à denominação, uma vez que consideram o soneto em sua forma tradicional e queo fato de se manter catorze linhas não garantiria a estrutura convencional do que pode ser originalmente considerado um soneto. Entretanto, em essência, a estrutura de um poema composto em catorze linhas com uma única palavra em cada verso mostra-se como algo inovador. Sabe-se que o fluir da arte poética não pressupõe obstáculos de estrutura e forma.

  15. Theory of triplon dynamics in the quantum magnet BiCu2PO6

    Science.gov (United States)

    Hwang, Kyusung; Kim, Yong Baek

    2016-06-01

    We provide a theory of triplon dynamics in the valence bond solid ground state of the coupled spin ladders modeled for BiCu2PO6 . Utilizing the recent high-quality neutron scattering data [K. W. Plumb et al., Nat. Phys. 12, 224 (2016), 10.1038/nphys3566] as guides and a theory of interacting triplons via the bond operator formulation, we determine a minimal spin Hamiltonian for this system. It is shown that the splitting of the low-energy triplon modes and the peculiar magnetic field dependence of the triplon dispersions can be explained by including substantial Dzyaloshinskii-Moriya and symmetric anisotropic spin interactions. Taking into account the interactions between triplons and the decay of the triplons to the two-triplon continuum via anisotropic spin interactions, we provide a theoretical picture that can be used to understand the main features of the recent neutron scattering experimental data.

  16. Field-induced reentrant magnetoelectric phase in LiNiPO4

    Science.gov (United States)

    Toft-Petersen, Rasmus; Fogh, Ellen; Kihara, Takumi; Jensen, Jens; Fritsch, Katharina; Lee, Jooseop; Granroth, Garrett E.; Stone, Matthew B.; Vaknin, David; Nojiri, Hiroyuki; Christensen, Niels Bech

    2017-02-01

    Using pulsed magnetic fields up to 30 T we have measured the bulk magnetization and electrical polarization of LiNiPO4 and have studied its magnetic structure by time-of-flight neutron Laue diffraction. Our data establish the existence of a reentrant magnetoelectric phase between 19 T and 21 T . We show that a magnetized version of the zero field commensurate structure explains the magnetoelectric response quantitatively. The stability of this structure suggests a field-dependent spin anisotropy. Above 21 T , a magnetoelectrically inactive, short-wavelength incommensurate structure is identified. Our results demonstrate the combination of pulsed fields with epithermal neutron Laue diffraction as a powerful method to probe even complex phase diagrams in strong magnetic fields.

  17. Quadrupole splitting and Eu partial lattice dynamics in europium orthophosphate EuPO {sub 4}

    Energy Technology Data Exchange (ETDEWEB)

    Klobes, B., E-mail: b.klobes@fz-juelich.de [JARA-FIT - Forschungszentrum Jülich GmbH, Jülich Centre for Neutron Science JCNS and Peter Grünberg Institute PGI (Germany); Arinicheva, Y., E-mail: y.arinicheva@fz-juelich.de; Neumeier, S., E-mail: s.neumeier@fz-juelich.de [Forschungszentrum Jülich GmbH, Institute of Energy and Climate Research (IEK-6) Nuclear Waste Management and Reactor Safety (Germany); Simon, R. E., E-mail: r.simon@fz-juelich.de; Jafari, A., E-mail: a.jafari@fz-juelich.de [JARA-FIT - Forschungszentrum Jülich GmbH, Jülich Centre for Neutron Science JCNS and Peter Grünberg Institute PGI (Germany); Bosbach, D., E-mail: d.bosbach@fz-juelich.de [Forschungszentrum Jülich GmbH, Institute of Energy and Climate Research (IEK-6) Nuclear Waste Management and Reactor Safety (Germany); Hermann, R. P., E-mail: hermannrp@ornl.gov [JARA-FIT - Forschungszentrum Jülich GmbH, Jülich Centre for Neutron Science JCNS and Peter Grünberg Institute PGI (Germany)

    2016-12-15

    Hyperfine interactions in europium orthophosphate EuPO{sub 4} were investigated using {sup 151}Eu Mössbauer spectroscopy from 6 to 300 K. The value of the quadrupole splitting and the asymmetry parameter were refined and further substantiated by nuclear forward scattering data obtained at room temperature. The temperature dependence of the relative absorption was modeled with an Eu specific Debye temperature of 221(1) K. Eu partial lattice dynamics were probed by means of nuclear inelastic scattering and the mean force constant, the Lamb-Mössbauer factor, the internal energy, the vibrational entropy, the average phonon group velocity were calculated using the extracted density of phonon states. In general, Eu specific vibrations are characterized by rather small phonon energies and contribute strongly to the total entropy of the system. Although there is no classical Debye like behavior at low vibrational energies, the average phonon group velocity can be reasonably approximated using a linear fit.

  18. Modelagem e previsão da perda de injetividade em poços canhoneados

    OpenAIRE

    Gomes, Vanessa Limeira Azevedo

    2010-01-01

    A injeção de água é uma técnica amplamente utilizada para deslocar o óleo em direção aos poços produtores e manter a pressão em reservatórios de petróleo. Entretanto, partículas suspensas na água injetada podem ser retidas no meio poroso, causando dano à formação (redução de permeabilidade) e perda de injetividade. Quando ocorre essa redução de injetividade é necessário aumentar a pressão de injeção para manter a vazão de água injetada. Desse modo, a correta previsão da perda de injetividade ...

  19. Luminescence properties of solid solutions LuxY1-xPO4:Eu3+

    Science.gov (United States)

    Levushkina, V. S.; Spassky, D. A.; Tretyakova, M. S.; Zadneprovski, B. I.; Kamenskikh, I. A.; Vasil'ev, A. N.; Belsky, A.

    2018-01-01

    Solid solutions LuxY1-xPO4 doped with Eu3+ were synthesized by the sol-gel method. Luminescence spectra under UV and X-ray excitation and luminescence excitation spectra in the UV-VUV energy range are presented. Observed variations of the structure of 4f-4f Eu3+ lines with the composition of the solid solution are explained by the fluctuations in the distribution of substitutional cations. The role of electronic structure modification in the fundamental absorption region with changing Y/Lu ratio is discussed and is suggested as the origin of different efficiency of energy transfer to Eu3+ in this region. Temperature dependence of the luminescence yield is related to the competition between emission centers and traps.

  20. Bremsstrahlung emission probability in the {alpha} decay of {sup 210}Po

    Energy Technology Data Exchange (ETDEWEB)

    Boie, Hans-Hermann

    2009-06-03

    A high-statistics measurement of bremsstrahlung emitted in the {alpha} decay of {sup 210}Po has been performed. The measured differential emission probabilities, which could be followed up to {gamma}-energies of {proportional_to} 500 keV, allow for the first time for a serious test of various model calculations of the bremsstrahlung accompanied {alpha} decay. It is shown that corrections to the {alpha}-{gamma} angular correlation due to the interference between the electric dipole and quadrupole amplitudes and due to the relativistic character of the process have to be taken into account. With the experimentally derived angular correlation the measured energydifferential bremsstrahlung emission probabilities show excellent agreement with the fully quantum mechanical calculation. (orig.)