1,744,732 research outputs found

    Sulfur geochemistry at ODP Site 112-680 and 112-686

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    We have measured the concentrations of (1) pore-water sulfide and (2) solid-phase pyrite, iron monosulfide (=acid volatile sulfide), elemental sulfur, and extractable and nonextractable organic ("kerogen") sulfur in sediments from Ocean Drilling Program (ODP) Sites 680 and 686. Pore-water sulfide defines classic "bell-shaped" profiles. Maximum concentrations of 6 to 12 mM occur where sulfate is exhausted, or is most depleted, at depths between 15 and 50 mbsf. Sulfide resulting from bacterial sulfate reduction reacts in three ways: (1) some is reoxidized to elemental sulfur in surface sediments; (2) some reacts with detrital iron minerals to form iron monosulfide and pyrite, primarily in the top meter or two of the sediment; and (3) some reacts with, and is incorporated into, kerogen. Incorporation of reduced sulfur into kerogen occurs over the top 15 m of the sediment at both Sites 680 and 686, after the main phase of pyrite formation. Up to 45% of the total sedimentary sulfur is organically bound, and concentrations of 12 wt% sulfur are reached in the kerogen. These values are like those measured in lithologically similar, but more deeply buried, sediments from the Monterey Formation

    Finite-temperature lattice QCD with Wilson fermions

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    Çelik T, Engels J, Satz H. Finite-temperature lattice QCD with Wilson fermions. Nuclear Physics, B. 1985;256:670-686

    Resolución Rectoral Nº 686/2014. Promueve docente a la categoría de Profesor Asociado.

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    Fil: Rector (R). Universidad Nacional de Río Negro. Río Negro, ArgentinaResolución Rectoral Nº 686/2014. Promueve docente a la categoría de Profesor Asociado, a partir del 1 de enero de 2015

    UMNH:Mamm:686

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    UMNH:Mamm:686 Voucher Specimen Study Ski

    El Tlacuache Núm. 686 (2015). 686 Año 13 (2015) agosto. El Tlacuache

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    Costumbres funerarias de cremación en El Tlatoani, Tlayacapan, Morelos por Lilian Ivette García Maya y Raúl Francisco González Quezada

    Verlustliste Nr. 686. (Nr. 686. /1918)

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    VERLUSTLISTE NR. 686. Verlustliste (-) Verlustliste Nr. 686. (Nr. 686. /1918) ([1]) Belehrung. (2) Offiziere. (3) A, B, C, D, E, F, G, H (3) I, J, K, L, M, N, O, P, R (4) S, T, U, V, W, Z (5) Einjährig-Freiwillige. (5) A, B, C, F, G (5) H, K, L, M, N, P, R, S, T, U, V, W, Z (6) Mannschaft. (6) A (6) B (7) C (10) D (12) E (13) F (14) G (15) H (16) I (19) J (19) K (20) L (25) M (27) N (32) O (34) P (35) R (40) S (43) T (53) U (56) V (56) W (59) Z (61) Ergänzungen zu den Verlustlisten: (63) Nr. 69. Nr. 188. Nr. 227. Nr. 662. Nr. 676. (63) Berichtigungen zu den Verlustlisten: (63) Nr. 155. Nr. 218. Nr. 233. Nr. 252. Nr. 267. Nr. 277. Nr. 280. Nr. 283. Nr. 291. Nr. 309. Nr. 426. Nr. 430. Nr. 506. Nr. 527. Nr. 548. Nr. 558. Nr. 570. Nr. 585. (63) Nr. 590. Nr. 605. Nr. 609. Nr. 611. Nr. 616. Nr. 620. Nr. 622. Nr. 625. Nr. 630. Nr. 631. Nr. 637. Nr. 651. Nr. 654. Nr. 656. Nr. 657. Nr. 659. Nr. 661. Nr. 662. Nr. 664-672. (64) Nr. 673. (64) L, B, D (64) L, P (65) Nr. 675-679. (65) Ergänzungen und Berichtigungen zu den Verlustlisten: (65) Nr. 14. Nr. 74. Nr. 76. Nr. 126. Nr. 243. Nr. 631. Nr. 676. (65

    Going Beyond Counting First Authors in Author Co-citation Analysis

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    The present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
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