Short-term spectral analysis of ODP Hole 114-704B

Short-term spectral analysis was carried out on geochemical logging data from ODP Site 704. The FFT was used to compute the amplitude spectra of short-term overlapping segments to produce depth-period-amplitude spectrograms of the logging data. The spectrograms provided a means of evaluating the significance of the observed periodic components. The periodic components that were consistently present and prominent across a given record interval were considered to be significant. Changes in the spectrogram characteristics seem to reflect changes in either lithology, sedimentation rates, or hiatuses and may therefore provide useful information to aid in stratigraphic and paleoenvironmental studies. The dominant periodicity during the late Pleistocene and Brunhes Chron (0.97 to 0.47 Ma) was determined to be > 100,000 yr whereas the upper Matuyama Chron was dominated by the 41,000-yr periodicity. These periodicities suggest that the sedimentation patterns within the upper Matuyama Chron (0.98-1.78 Ma) were influenced by the Milankovitch obliquity cycle and those within the latest Matuyama-Brunhes Chron (<0.98 Ma) by the eccentricity cycle. The Brunhes/Matuyama boundary therefore represents a major discontinuity. Periodicities observed within the lower Matuyama and the upper Gauss Chron did not correlate with any of the periodicities within the Milankovitch frequency bands.

Pore-water chemistry of ODP Leg 114 holes

Pore-water samples were recovered at five sites from ODP Leg 114 in the subantarctic South Atlantic Ocean and analyzed for pH, alkalinity, chloride, sulfate, fluoride, silica, magnesium, calcium, strontium, potassium, lithium, and barium. At sites in the East Georgia Basin and on the Islas Orcadas Rise, Ca increases and Mg decreases linearly downhole with a DeltaMg/DeltaCa ratio reflecting conservative diffusive exchange and basalt basement reactions. At sites on the west flank of the Mid-Atlantic Ridge and on the Meteor Rise, Ca gradients are nonlinear, and nonconservative DeltaMg/DeltaCa ratios reflect alteration reactions of abundant silicic volcanic ash in the sediment. K decreases linearly downhole at all sites, reflecting uptake by basement and the absence of significant sediment-hosted reactions. SO4 decreases and alkalinity increases downhole are due to a slight sulfate reduction at all sites except at Site 701. Sr increases downhole at all sites except Site 701, with DeltaSr/DeltaCa ratios reflecting diffusive exchange with basement. At Site 704 on the Meteor Rise, there is intense Sr production during carbonate recrystallization in the upper 200 mbsf. Below 200 mbsf at Site 704, the ion concentration product of SrSO4 is constant, suggesting Sr control by celestite solubility. Li and F concentrations display complex behavior related to sedimentary reactions, probably calcite recrystallization (Li uptake and F release).

Dynamic viscosity of ternary mixtures of dichlorodifluoromethane (R-12), chlorodifluoromethane (R-22), and dichlorotetrafluoroethane (R-114) vapors

The viscosities of ternary mixtures of R-12, R-22, and R-114 vapors were determined at ambient temperature and pressure within +-1% by using an oscillating disk viscometer. The empirical viscosity obtained by Wllke's equation compares very well with the experimental results obtained with this vlscometer. In the case of this ternary vapor mixture, as long as the molar fraction ratio of R-12 to R-114 Is maintained at approximately 2"' (=Inverse ratio of thelr molecular weights) the viscosity of the ternary mixture at ambient temperature and pressure remalns constant irrespective of the percentage of R-22 present in the mixture.

Sapientia, 1974, Vol. XXIX, nº 114 (número completo)

Contenido: Tomás de Aquino en su VII centenario / Gustavo Eloy Ponferrada – Santo Tomás y los capítulos generales de la orden de los Hermanos Predicadores, 1278-1370 / J. E. Bolzán ; Azucena A. Fraboschi – Jacques Chevalier et le Thomisme / Alain Guy – Notas y comentarios -- Bibliografía

Diário da Constituinte [gravação de vídeo] : [programa n. 704]

O Congresso vai decidir se irá inspecionar as contas do governo. A primeira emenda do dia pedia a supressão do inciso IV, do artigo 62, que determina que não seja apreciada emenda para abolir direitos e garantias individuais, que foi rejeitada. A segunda emenda rejeitada foi a que permitia a privatização dos terrenos de marinha. Foi aprovada a seguir uma reunião de emendas que garantiam que as áreas em ilhas oceânicas sob o domínio da União são bens do estado. Foram votadas um grupo de emendas que estabelecem: o número de deputados deve ser mais de oito e menos de setenta por unidade federativa; o Congresso, com o auxilio do Tribunal de Contas da União, tem o poder de realizar auditorias quando requeridas, e qualquer cidadão, partido político ou associação poderá denunciar irregularidades no poder público; deputado ou senador que assumir cargo de ministro, governador de território e secretário de estado não perderá o mandato. A última emenda rejeitada propunha a supressão do tempo de mandato para os ministros do Tribunal de Contas, pelo texto que permanece os ministros terão mandato de seis anos. Barbosa Lima Sobrinho, presidente da Associação Brasileira de Imprensa, comparece ao Plenário para entregar abaixo assinado para a manutenção dos pontos a favor da empresa nacional já aprovados no primeiro turno. Aguarda-se a votação da publicidade política, a conclusão de votação de todo o Título 4 e inicio do votação do Tìtulo 5. Depoimentos: Nelson Wedekin (PMDB/SC), Irma Passoni (PT/SP), Luis Freire (PMDB/PE), Barbosa Lima Sobrinho (Presidente da ABI) ;Pompeu de Souza (PDSB/DF), ; Luiz Salomão (PDT/RJ), Ulysses Guimarães (Presidente da Constituinte).