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  • 2020-2024  (185)
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  • 1
    Publication Date: 2024-03-23
    Description: Fabulations nocturnes est un essai d’intercession. Ce n’est pas simplement un livre à propos du cinéaste Apichatpong Weerasethakul, bien qu’il se penche de près sur son œuvre. C’est plutôt un livre qui interroge en profondeur quoi d’autre pourrait être en cause dans la mise en place des conditions de collaboration entre deux genres – le cinéma et l’écriture. Ce projet collectif est animé d’un intérêt commun pour la pragmatique de la fabulation et son geste spéculatif générateur d’un peuple à venir. Les concepts d’écologie, de vitalité et d’opacité ont surgi de la rencontre avec le dramscape d’Apichatpong pour venir articuler un ethos de fabulation qui décadre l’expérience, recompose la subjectivité et défixe le temps.
    Keywords: experience ; subjectivity ; cinema ; ecology ; pragmatics of fabulation ; time ; writing ; opacity ; vitality ; apichatpong weerasethakul ; thema EDItEUR::A The Arts::AT Performing arts::ATF Films, cinema::ATFA Film history, theory or criticism ; thema EDItEUR::A The Arts::AT Performing arts::ATF Films, cinema::ATFB Individual film directors, film-makers
    Language: French
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  • 2
    Publication Date: 2022-01-31
    Description: Les dolmens ardéchois marquent la limite orientale de l'ensemble des tombes monumentales qui occupent les causses au sud et à l'ouest du Massif central à la fin du Néolithique. La plupart de ces sépultures qui sont souvent groupées en petites nécropoles assez lâches, sont dans le sud du département de l'Ardèche, concentration qui empiète sur le nord-est du Gard. Après une interruption des travaux de terrain sur les dolmens de l'Ardèche pendant plus d'une décennie et en prévision d'une opérat...
    Keywords: dolmens ; Bas-Languedoc ; Bourg-Saint-Andéol ; Ardèche ; France ; tombes préhistoriques
    Language: French
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  • 3
    Publication Date: 2024-03-23
    Description: Nocturnal Fabulations is an essay in intercessing. This is not a book that is simply ‘about’ Apichatpong Weerasethakul, though it does engage his work in detail. It is a book that deeply questions what else might be at stake in setting up the conditions for collaboration across two genres: cinema and writing. This collective project is animated by a shared curiosity in the pragmatics of fabulation and its speculative gesture of bringing forth a people to come. In an encounter with Apichatpong’s cinematic dreamscape, the concepts of ecology, vitality and opacity emerge to articulate an ethos of fabulation that deframes experience, recomposes subjectivity and unfixes time.
    Keywords: experience ; subjectivity ; cinema ; ecology ; pragmatics of fabulation ; time ; writing ; opacity ; vitality ; apichatpong weerasethakul ; Aesthetics ; Alterity ; Decoupage ; Félix Guattari ; Gilles Deleuze ; Mysterious Object at Noon ; Ontology ; Thailand ; thema EDItEUR::A The Arts::AT Performing arts::ATF Films, cinema::ATFA Film history, theory or criticism ; thema EDItEUR::A The Arts::AT Performing arts::ATF Films, cinema::ATFB Individual film directors, film-makers
    Language: English
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  • 4
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    Pensoft Publishers
    Publication Date: 2024-04-05
    Description: Rhinophoridae are a small family of calyptrate flies commonly known as “woodlouse flies” due to their unique parasitoid habit of developing inside their isopod hosts (Oniscidea). Beside this peculiarity, the adult stage lacks unique family autapomorphies, sometimes making their identification challenging. However, their larvae are highly apomorphic and peculiar due to their unusual locomotive behaviour of leach-like crawling or even somersaulting. Until recently, woodlouse flies were considered an Old World group, with a peak in species diversity in the Turano-Mediterranean area. However, recent discoveries of new taxa in the tropics suggest that this was due to inadequate sampling of the Southern Hemisphere faunas. Confirming this lack of knowledge, four new genera and five new species are described here from both the Old and New World tropics, including a remarkable species endemic to the Mascarene Islands. Recent phylogenetic studies are helping us to better understand rhinophorid boundaries, and the family circumscription is adjusted accordingly. During the last decade, several taxa have been either included or excluded, and others have been proposed as new to science, making the compilation of this world catalogue highly needed. A richly illustrated key to the world woodlouse fly genera is provided.
    Keywords: QL1-991 ; thema EDItEUR::P Mathematics and Science::PS Biology, life sciences::PSV Zoology and animal sciences
    Language: English
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  • 5
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    Presses universitaires de Provence
    Publication Date: 2024-03-29
    Description: La conversion religieuse est un processus énigmatique, parfois insaisissable, entre les bouleversements spirituels et leur encadrement religieux, entre la portée d’un changement individuel et l’ampleur de ses effets sociaux. À partir d’une ethnographie de la conversion religieuse menée durant plusieurs années et avec une optique comparative inédite entre les trois monothéismes, l’ouvrage détaille la façon dont on se convertit aujourd’hui en France. Loin de l’idée communément admise de l’abjuration soudaine d’un individu, ce livre montre le rôle central de la nouvelle religion dans l’émergence d’un récit de conversion et l’importance cruciale des proches (familles et amis) dans l’évolution spirituelle des convertis qui vivent en quelque sorte un coming-out religieux. En laissant une large place à ceux qui traversent, encadrent et accompagnent cette odyssée spirituelle, l’ouvrage détaille les étapes de la conversion religieuse en montrant ce qui est attendu des convertis et les façons dont ils s’emploient à y répondre. L’auteur développe une conception relationnelle des conversions religieuses tout en questionnant la place contestée du religieux dans la société française. Les histoires de conversions rapportées dans cet ouvrage témoignent des redéfinitions en cours des identités religieuses en France et la singularité des nouveaux convertis dans un pays laïc et sécularisé, croyants dans un monde incroyant.
    Keywords: religion ; musulmans ; conversion ; juifs ; chrétiens ; foi ; thema EDItEUR::J Society and Social Sciences::JB Society and culture: general::JBS Social groups, communities and identities::JBSR Social groups: religious groups and communities
    Language: French
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  • 6
    Publication Date: 2023-02-08
    Description: We report on the geochemistry of hydrocarbons and pore waters down to 62.5 mbsf, collected by drilling with the MARUM‐MeBo70 and by gravity coring at the Lunde pockmark in the Vestnesa Ridge. Our data document the origin and transformations of volatiles feeding gas emissions previously documented in this region. Gas hydrates are present where a fracture network beneath the pockmark focusses migration of thermogenic hydrocarbons characterized by their C1/C2+ and stable isotopic compositions (δ2H‐CH4, δ13C‐CH4). Measured geothermal gradients (~80°C km‐1) and known formation temperatures (〉70°C) suggest that those hydrocarbons are formed at depths 〉800 mbsf. A combined analytical/modeling approach, including concentration and isotopic mass balances, reveals that pockmark sediments experience diffuse migration of thermogenic hydrocarbons. However, at sites without channeled flow this appears to be limited to depths 〉 ~50 mbsf. At all sites we document a contribution of microbial methanogenesis to the overall carbon cycle that includes a component of secondary carbonate reduction (CR) – i.e. reduction of dissolved inorganic carbon (DIC) generated by anaerobic oxidation of methane (AOM) in the uppermost methanogenic zone. AOM and CR rates are spatially variable within the pockmark and are highest at high‐flux sites. These reactions are revealed by δ13C‐DIC depletions at the sulfate‐methane interface at all sites. However, δ13C‐CH4 depletions are only observed at the low methane flux sites because changes in the isotopic composition of the overall methane pool are masked at high‐flux sites. 13C‐depletions of TOC suggest that at seeps sites, methane‐derived carbon is incorporated into de novo synthesized biomass.
    Type: Article , PeerReviewed
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  • 7
    Publication Date: 2023-02-08
    Description: Highlights • Combining porewater geochemistry, geochemical modeling and subsurface geophysical data in order to understand the fluid flow system of Kerch seep area. • This seep area is not in steady state. • Methane transport is in the form of gas bubbles not porewater advection. • High surface temperatures are the result of hydrate formation and not an indication for elevated geothermal gradients. • Modeling says this seep is young (〈500 years old). Abstract High-resolution 3D seismic data in combination with deep-towed sidescan sonar data and porewater analysis give insights into the seafloor expression and the plumbing system of the actively gas emitting Kerch seep area, which is located in the northeastern Black Sea in around 900 m water depth, i.e. well within the gas hydrate stability zone (GHSZ). Our analysis shows that the Kerch seep consists of three closely spaced but individual seeps above a paleo-channel-levee system of the Don Kuban deep-sea fan. We show that mounded seep morphology results from sediment up-doming due to gas overpressure. Each of the seeps hosts its own gas pocket underneath the domes which are fed with methane of predominantly microbial origin along narrow pipes through the GHSZ. Methane transport occurs dominantly in the form of gas bubbles decoupled from fluid advection. Elevated sediment temperatures of up to 0.3 °C above background values are most likely the result of gas hydrate formation within the uppermost 10 m of the sediment column. Compared to other seeps occurring within the GHSZ in the Black Sea overall only scarce gas indications are present in geoacoustic and geophysical data. Transport-reaction modeling suggests that the Kerch seep is a young seep far from steady state and probably not more than 500 years old.
    Type: Article , PeerReviewed
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  • 8
    Publication Date: 2023-02-08
    Description: The Svalbard margin represents one of the northernmost gas hydrate provinces worldwide. Vestnesa Ridge (VR) and Svyatogor Ridge (SR) west of Svalbard are two prominent sediment drifts showing abundant pockmarks and sites of seismic chimney structures. Some of these sites at VR are associated with active gas venting and were the focus of drilling and coring with the seafloor‐deployed MARUM‐MeBo70 rig. Understanding the nature of fluid migration and gas hydrate distribution requires (amongst other parameters) knowledge of the thermal regime and in situ gas and pore‐fluid composition. In situ temperature data were obtained downhole at a reference site at VR defining a geothermal gradient of ~78 mK m‐1 (heat flow ~95 mW m‐2). Additional heat‐probe data were obtained to describe the thermal regime of the pockmarks. The highest heat flow values were systematically seen within pockmark depressions and were uncorrelated to gas venting occurrences. Heat flow within pockmarks is typically ~20 mW m‐2 higher than outside pockmarks. Using the downhole temperature data and gas compositions from drilling we model the regional base of the gas hydrate stability zone (BGHSZ). Thermal modeling including topographic effects suggest a BGHSZ up to 40 m deeper than estimated from seismic data. Uncertainties in sediment properties (velocity and thermal conductivity) are only partially explaining the mismatch. Capillary effects due to small sediment grain sizes may shift the free gas occurrence above the equilibrium BGHSZ. Changes in gas composition or pore fluid salinity at greater depth may also explain the discrepancy in observed and modeled BGHSZ.
    Type: Article , PeerReviewed
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  • 9
    Publication Date: 2023-02-08
    Description: Highlights • Release of dissolved Sr2+ with low 87Sr/86Sr, as well as Ca2+ and Ba2+ suggests ongoing volcanic ash alteration. • A concurrent increase in Fe2+ and a depletion of CH4 with a decrease in C of CH4 and DIC suggest Fe-AOM. • We for the first time document the potential linkage between ash alteration and methane oxidation via Fe-AOM. • The rate of Fe-AOM is estimated to be ∼0.4 μmol cm−2 yr−1, equivalent to ∼12% of total CH4 removal. Abstract We present geochemical data collected from volcanic ash-bearing sediments on the upper slope of the northern Hikurangi margin during the RV SONNE SO247 expedition in 2016. Gravity coring and seafloor drilling with the MARUM-MeBo200 allowed for collection of sediments down to 105 meters below seafloor (mbsf). Release of dissolved Sr2+ with isotopic composition enriched in 86Sr (87Sr/86Sr minimum = 0.708461 at 83.5 mbsf) is indicative of ash alteration. This reaction releases other cations in the 30-70 mbsf depth interval as reflected by maxima in pore-water Ca2+ and Ba2+ concentrations. In addition, we posit that Fe(III) in volcanogenic glass serves as an electron acceptor for methane oxidation, a reaction that releases Fe2+ measured in the pore fluids to a maximum concentration of 184 μM. Several lines of evidence support our proposed coupling of ash alteration with Fe-mediated anaerobic oxidation of methane (Fe-AOM) beneath the sulfate-methane transition (SMT), which lies at ∼7 mbsf at this site. In the ∼30-70 mbsf interval, we observe a concurrent increase in Fe2+ and a depletion of CH4 with a well-defined decrease in C-CH4 values indicative of microbial fractionation of carbon. The negative excursions in C values of both DIC and CH4 are similar to that observed by sulfate-driven AOM at low SO concentrations, and can only be explained by the microbially-mediated carbon isotope equilibration between CH4 and DIC. Mass balance considerations reveal that the iron cycled through the coupled ash alteration and AOM reactions is consumed as authigenic Fe-bearing minerals. This iron sink term derived from the mass balance is consistent with the amount of iron present as carbonate minerals, as estimated from sequential extraction analyses. Using a numerical modeling approach we estimate the rate of Fe-AOM to be on the order of 0.4 μmol cm−2 yr−1, which accounts for ∼12% of total CH4 removal in the sediments. Although not without uncertainties, the results presented reveal that Fe-AOM in ash-bearing sediments is significantly lower than the sulfate-driven CH4 consumption, which at this site is 3.0 μmol cm−2 yr−1. We highlight that Fe(III) in ash can potentially serve as an electron acceptor for methane oxidation in sulfate-depleted settings. This is relevant to our understanding of C-Fe cycling in the methanic zone that typically underlies the SMT and could be important in supporting the deep biosphere.
    Type: Article , PeerReviewed
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  • 10
    Publication Date: 2023-02-08
    Description: Highlights • MeBo drilling in Danube fan down to 147 m recovered limnic to marine deposits. • Molecular and stable isotope characterization of light hydrocarbons, CO2, and H2O. • H and O isotopic compositions of pore water reflect paleoclimate variations. • Isotope relations prove microbial carbonate reduction as major methanogenic pathway. • Control of δ2H–CH4 by δ2H–H2O may lead to misinterpretation of methanogenic paths. Abstract We report on the geochemistry of light hydrocarbons and pore water in sediments down to 147 m below seafloor (mbsf), at two sites within the gas hydrate stability field of the Danube deep-sea fan, Black Sea. Sediments were drilled with MARUM-MeBo200 and comprise the transition from limnic to the recent marine stage. Stable C/N ratios (mean 5.1 and 5.6) and δ13C-Corg values (mean −25.8‰ V-PDB) suggest relatively uniform bulk organic matter compositions. In contrast, pore water δ2H and δ18O values varied considerably from approx. −120‰ to −30‰ V-SMOW and from −15‰ to −3‰ V-SMOW, respectively. These data pairs plot close to the ‘Global Meteoric Water Line’ and indicate paleo temperature variations. Depletions of pore water in 2H and 18O below 40 mbsf indicate low temperatures and likely reflect conditions during (the) last glacial period(s). Methane was much more abundant than the only other hydrocarbons found in notable concentrations, ethane and propane ((C1/(C2+C3) ≥20,000). Relatively constant δ13C–CH4 (~−70‰ V-PDB) and δ13C–C2H6 (~−52‰ V-PDB) values with depth indicate that methane and ethane are predominantly of microbial origin and that their formation was not limited by carbon availability. In contrast, δ2H–CH4 values varied in a large range (approx. −310 to −240‰ V-SMOW) with depth and positively correlated with trends observed for δ2H–H2O. Isotope separations (Δδ13C(CH4–CO2), Δδ2H(CH4–H2O)) substantiate that microbial carbonate reduction (CR) is the prevalent methanogenic pathway throughout the sediments irrespective of their geochemical history. Remarkably, in δ13C–CH4 – δ2H–CH4 diagrams widely used, samples characterized by δ2H–CH4 values more negative than approx. −250‰ plot out of the field assigned for pure CR. We conclude that assignments of microbial methanogenic pathways based on classical interpretations of δ13C–CH4 – δ2H–CH4 pairs can lead to misinterpretations, as severe 2H-depletions of methane formed through microbial CR can result from 2H-depletions of the pore water generated during low-temperature climatic periods.
    Type: Article , PeerReviewed
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