Cryogenic and non-cryogenic pool calcites indicating permafrost and non-permafrost periods: a case study from the Herbstlabyrinth-Advent Cave system (Germany)

Weichselian cryogenic calcites collected in what is referred to as the Rätselhalle of the Herbstlabyrinth-Advent Cave system are structurally classified as rhombohedral crystals and spherulitic aggregates. The carbon and oxygen isotopic composition of these precipitates (<i>δ</i><sup>13</sup>C = +0.6 to −7.3‰ <i>δ</i><sup>18</sup>O = −6.9 to −18.0‰) corresponds to those of known slowly precipitated cryogenic cave calcites under conditions of isotopic equilibrium between water and ice of Central European caves. The carbon and oxygen isotopic composition varies between different caves which is attributed to the effects of cave air ventilation before the freezing started. <br><br> By petrographic and geochemical comparisons of Weichselian cryogenic calcite with recent to sub-recent precipitates as well as Weichselian non-cryogenic calcites of the same locality, a model for the precipitation of these calcites is proposed. While the recent and sub-recent pool-calcites isotopically match the composition of interglacial speleothems (stalagmites, etc.), isotope ratios of Weichselian non-cryogenic pool-calcites reflect cooler conditions. Weichselian cryogenic calcites show a trend towards low <i>δ</i><sup>18</sup>O values with higher carbon isotope ratios reflecting slow freezing of the precipitating solution. In essence, the isotope geochemistry of the Weichselian calcites reflects the climate history changing from overall initial permafrost conditions to permafrost-free and subsequently to renewed permafrost conditions. Judging from the data compiled here, the last permafrost stage in the Rätselhalle is followed by a warm period (interstadial and/or Holocene). During this warmer period, the cave ice melted and cryogenic and non-cryogenic Weichselian calcite precipitates were deposited on the cave ground or on fallen blocks, respectively

Infrared regulators and SCETII

We consider matching from SCETI, which includes ultrasoft and collinear particles, onto SCETII with soft and collinear particles at one loop. Keeping the external fermions off their mass shell does not regulate all IR divergences in both theories. We give a new prescription to regulate infrared divergences in SCET. Using this regulator, we show that soft and collinear modes in SCETII are sufficient to reproduce all the infrared divergences of SCETI. We explain the relationship between IR regulators and an additional mode proposed for SCETII.Comment: 9 pages. Added discussion about relationship between IR regulators and messenger mode

Observation of the superconducting proximity effect in Nb/InAs and NbNx/InAs by Raman scattering

URL:http://link.aps.org/doi/10.1103/PhysRevB.66.134530 DOI:10.1103/PhysRevB.66.134530High-quality thin Nb and NbN films (60-100 Å) are grown on (100) n+-InAs (n=1019cm-3) substrates by dc-magnetron sputter deposition. Studies of the electronic properties of interfaces between the superconductor and the semiconductor are done by Raman scattering measurements. The superconducting proximity effect at superconductor-semiconductor interfaces is observed through its impact on inelastic light scattering intensities originating from the near-interface region of InAs. The InAs longitudinal optical phonon LO mode (237cm-1) and the plasmon-phonon coupled modes L- (221cm-1) and L+ (1100 to 1350cm-1), for n+=1×1019-2×1019cm-3 are measured. The intensity ratio of the LO mode (associated with the near-surface charge accumulation region, in InAs) to that of the L- mode (associated with bulk InAs), is observed to increase by up to 40% below the superconducting transition temperature. This temperature-dependent change in light scattering properties is only observed with high quality superconducting films and when the superconductor and the semiconductor are in good electrical contact. A few possible mechanisms of the observed effect are proposed.We gratefully acknowledge support from the United States Department of Energy through Materials Research Laboratory~Grant No. DEFG02-96ER45439! ~I.V.R., A.C.A., L.H.G., T.A.T., J.F.D., P.W.B., J.F.K.!, and from the United States Department of Energy through Midwest Superconductivity Consortium ~MISCON! ~Grant No. DE FG02-90ER45427! and the NSF ~Grant No. DMR 96-23827! ~S.W.H., P.F.M.!. SEM, XRD, XPS, and RBS materials characterizations were performed at the Center for Microanalysis of Materials and Microfabrication Center at Frederick Seitz Materials Research Laboratory, University of Illinois at Urbana- Champaign ~Grant No. DE FG02-96ER45439!. Sandia is a multiprogram laboratory operated by Sandia Corporation, a Lockheed Martin company, for the United States Department of Energy under Contract No. DE-AC04-94AL85000

La communication du sens dans le contexte d'une tradution du français vers l'anglais d'un roman contemporain marocain,Une Via à Trois, par Bahaa Travelsi

Includes abstract.Includes bibliographical references.This thesis examines the communication of meaning in the context of the translation from French into English of a contemporary Moroccan novel, Une Vie à Trois, by Bahaa Trabelsi. To explore the notion of a faithful translation, the approach of the Ecole Superieure d'lnterpretes et de Traducteurs (ESIT) is examined. This approach, developed by Danica Seleskovitch and Marianne Lederer, emphasises the communication of meaning and the crucial role that interpretation plays in the act of translation. The project is composed of two parts - the practical application of the ESIT approach in the production of a translation of Une Vie à Trois and a theoretical study of the approach

Untying a Gordian Knot: a Holistic Approach to Improving General Education Assessment

Poster presented at the Assessment for Curricular Improvement Poster Exhibit 2025.The Director of Core Education at Point Park University conducted an assessment cycle for the Information Literacy SLO in the Undergraduate Core Curriculum in AY 2023-24. This was the first assessment conducted under a new Director to establish a baseline performance level for curriculum mapped to that SLO. The assessment revealed much more than just baseline performance for an SLO. This poster presents the weaknesses in the university’s existing assessment processes and charts a path for improvement based on the results from just one assessment cycle

More about Research in Ambiguous, Conflictual, and Changing Contexts : Studying Ethnic Populations in China, Xi\u27an to Urumqi

A recent article in this journal discusses ways to manage uncertainty when the research field abruptly and significantly changes on researchers working inside their own society (Kacen & Chaitin, 2006). Our essay extends this discussion by asking: How do researchers manage ambiguous, conflictual, and rapidly changing events when they engage in study outside their own society? We describe three aspects of our data collection experience that coincidentally began one week before the Urumqi city, Xinjiang, China, riots of 2009 in which over 200 people were reported as killed and several thousand injured: (a). our original research agenda and the uncertain situation in Xinjiang in recent years; (b). how we modified our research project and approach to data collection; and (c). what we learned that can contribute to knowledge about conducting research under ambiguous, potentially unstable and rapidly changing socio-political conditions

New Developments at Preservation Technologies

Intervention au 36e congrès LIBER qui s\u27est tenu à Varsovie du 3 au 7 juillet 2007. Présentation de l\u27offre de produits et services de conservation de la société Preservation Technologies : désacidification, conservation des supports audio et vidéo, séchage des papiers, etc

Improving Patient Activation in Crisis and Chronic Care Through Rhetorical Approaches to New Media Technologies

As the U.S. population both increases and ages over the next 40 years, the numbers of patients requiring healthcare for both crisis-oriented and chronic conditions will grow in tandem (USHHS, 2009). This growth requires that healthcare practitioners and patients master new methodologies for communicating about care. Among these methodological possibilities are new and social media, such as websites, mobile phone text messaging, interactive websites, YouTube, Twitter, and Facebook. Here, communication and rhetoric of science scholars can help shape the future efficacy of Web 2.0 healthcare communication and the strategies its practitioners use toward patient activation