Affiner les résultats


Université de Fribourg

Assessment of the amphora spectrum in a rural Late La Tène settlement at Reinach-Nord, Basel region, Switzerland

Thierrin-Michael, G. ; Martinez, D. C. Tretola ; Serneels, Vincent

In: Journal of Archaeological Science: Reports, 2018, vol. 21, p. 1055–1063

The relatively high quantity of amphorae among the ceramic material discovered in Late La Tène structures at Reinach-Nord appears quite unusual at a rural settlement of this period in NE Switzerland and warranted further investigation. How does the amphora spectrum compare to the one of earlier or later sites in the region? On earlier settlements in the area between Lyon, the Upper Rhine...

Université de Fribourg

Microbial life in the grapevine: what can we expect from the leaf microbiome?

Vionnet, Léo ; Vrieze, Mout De ; Dutartre, Agnès ; Gfeller, Aurélie ; Lüthi, Angelika ; L’Haridon, Floriane ; Weisskopf, Laure

In: OENO One, 2018, vol. 52, no. 3, p. 219–224

Recent studies have shown that plants harbor complex bacterial communities, the so- called “microbiome”. We are only beginning to unravel the origin of these bacterial plant inhabitants, their community structure and their roles, which, in analogy to the gut microbiome, are likely to be of essential nature. The aim of this work was to analyze the abundance and diversity of the cultivable...

Université de Fribourg

Nonequilibrium steady states of electric field driven Mott insulators

Murakami, Yuta ; Werner, Philipp

In: Physical Review B, 2018, vol. 98, no. 7, p. 075102

We present a systematic study of the nonequilibrium steady states (NESS) in Mott insulators driven by dc or ac electric fields, based on the Floquet dynamical mean- field theory. The results are analyzed using a generalized tunneling formula for the current, which is reminiscent of the Meir-Wingreen formula and provides insights into the relevant physical processes. In the dc case, the...

Université de Fribourg

Chromatic numbers of spheres

Prosanov, Roman

In: Discrete Mathematics, 2018, vol. 341, no. 11, p. 3123–3133

The chromatic number of a subset of Euclidean space is the minimal number of colors sufficient for coloring all points of this subset in such a way that any two points at the distance 1 have different colors. We give new upper bounds on chromatic numbers of spheres. This also allows us to give new upper bounds on chromatic numbers of any bounded subsets.

Université de Fribourg

The Malpaisillo Formation: A sequence of explosive eruptions in the mid to late Pleistocene (Nicaragua, Central America)

Stoppa, Line ; Kutterolf, Steffen ; Rausch, Juanita ; Grobety, Bernard ; Pettke, Thomas ; Wang, Kuo-Lung ; Hemming, Sidney

In: Journal of Volcanology and Geothermal Research, 2018, vol. 359, p. 47–67

The subduction-related volcanic front in Nicaragua consists of the Tertiary “Coyol” member in the eastern highlands and the Quaternary to recent volcanic arc within the Nicaraguan depression. Although the Holocene to recent explosive volcanism has been studied extensively no detailed work has been done on the products of explosive volcanism from Quaternary volcanic complexes comprising...

Université de Fribourg

Revision of the planktonic foraminiferal biostratigraphy of the Voirons Flysch (Chablais Prealps, Haute-Savoie, France)

Ragusa, Jérémy ; Ospina-Ostios, Lina Maria ; Spezzaferri, Silvia ; Kindler, Pascal

In: Swiss Journal of Geosciences, 2018, vol. 111, no. 3, p. 461–473

The ages obtained from planktonic foraminiferal assemblages retrieved from two exposures in the Gurnigel Flysch and from the re-examination of similar material gathered by previous researchers from the Voirons Flysch reveal only minor discrepancies with previous studies based on nannofossil biostratigraphy. In contrast, major divergences between this work and previous studies on the Voirons...

Université de Fribourg

Large-scale paleoceanographic variations in the western Mediterranean Sea during the last 34,000 years: From enhanced cold-water coral growth to declining mounds

Stalder, Claudio ; El Kateb, Akram ; Vertino, Agostina ; Rüggeberg, Andres ; Camozzi, Osvaldo ; Pirkenseer, Claudius M. ; Spangenberg, Jorge E. ; Hajdas, Irka ; Rooij, David Van ; Spezzaferri, Silvia

In: Marine Micropaleontology, 2018, vol. 143, p. 46–62

Quantitative and qualitative analyses of cold-water coral (CWC) fragments from two sediment cores obtained from the Melilla Mounds Field (MMF) in the Alboran Sea, western Mediterranean Sea, reveal an alternation of periods dominated by distinct CWC species. The lower parts of the cores are dominated by the CWC species Lophelia pertusa, which is successively replaced in the upper parts by the...

Université de Fribourg

Multi-proxy facies analysis of the Opalinus Clay and depositional implications (Mont Terri rock laboratory, Switzerland)

Lauper, Bruno ; Jaeggi, David ; Deplazes, Gaudenz ; Foubert, Anneleen

In: Swiss Journal of Geosciences, 2018, vol. 111, no. 3, p. 383–398

Located in NW Switzerland, the Mont Terri rock laboratory is a research facility primarily investigating the Opalinus Clay as potential host rock for deep geological disposal of radioactive waste. In the Mont Terri area, this Jurassic shale formation is characterized by three distinctive lithofacies: a shaly facies, a carbonate-rich sandy facies and a sandy facies. However, the lithological...

Université de Fribourg

Biostratigraphy of large benthic foraminifera from Hole U1468A (Maldives): a CT-scan taxonomic approach

Coletti, Giovanni ; Stainbank, Stephanie ; Fabbrini, Alessio ; Spezzaferri, Silvia ; Foubert, Anneleen ; Kroon, Dick ; Betzler, Christian

In: Swiss Journal of Geosciences, 2018, vol. 111, no. 3, p. 523–536

Large benthic foraminifera are important components of tropical shallow water carbonates. Their structure, developed to host algal symbionts, can be extremely elaborate and presents stratigraphically-significant evolutionary patterns. Therefore their distribution is important in biostratigraphy, especially in the Indo-Pacific area. To provide a reliable age model for two intervals of IODP...

Université de Fribourg

Benthic foraminifera in a deep-sea high-energy environment: the Moira Mounds (Porcupine Seabight, SW of Ireland)

Fentimen, Robin ; Rüggeberg, Andres ; Lim, Aaron ; El Kateb, Akram ; Foubert, Anneleen ; Wheeler, Andrew J. ; Spezzaferri, Silvia

In: Swiss Journal of Geosciences, 2018, vol. 111, no. 3, p. 561–572

Cold-water coral ecosystems represent unique and exceptionally diverse environments in the deep-sea. They are well developed along the Irish margin, varying broadly in shape and size. The Moira Mounds, numerous small-sized mounds, are nestled in the Belgica Mound Province (Porcupine Seabight, North-East Atlantic). The investigation of living (Rose Bengal stained) and dead benthic...