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Université de Neuchâtel

Measurement of the linewidth enhancement factor of singlemode room temperature continuous wave quantum cascade lasers

Aellen, Thierry ; Aebi, Philipp (Dir.)

Thèse de doctorat : Université de Neuchâtel, 2008.

L'invention des sources lasers en 1960 a conduit à un bon nombre d'applications qui ont un impact répandu dans tous les aspects de notre votre vie actuelle, citons notamment l'exemple des hôpitaux, de l'industrie ou simplement dans notre lieu de vie. Les derniers développements sont en particulier issus des compacts, très efficace et populaires lasers semiconducteurs qui sont simplement...

Université de Fribourg

Seismotectonic analysis around the Mont Terri rock laboratory (Switzerland): a pilot study

Abednego, Martinus ; Blascheck, Patrick ; Schefer, Senecio ; Nussbaum, Christophe ; Joswig, Manfred ; Bossart, Paul ; Mosar, Jon

In: Swiss Journal of Geosciences, 2017, vol. 110, no. 1, p. 233–251

For this pilot study we used recorded seismic events from the SED permanent network and data from a dedicated SNS network to improve the seismotectonic understanding of very weak seismicity in the vicinity of the Mont Terri underground laboratory. We combined field data on faults with microseismic events and modelling of stress and focal mechanisms. Eighty-six events with very low magnitudes...

Université de Neuchâtel

The Revised Classification of Eukaryotes

Adl, Sina M. ; Simpson, Alastair G. B. ; Lane, Christopher E. ; Lukeš, Julius ; Bass, David ; Bowser, Samuel S. ; Brown, Matthew W. ; Burki, Fabien ; Dunthorn, Micah ; Hampl, Vladimir ; Heiss, Aaron ; Hoppenrath, Mona ; Lara, Enrique ; le Gall, Line ; Lynn, Denis H. ; McManus, Hilary ; Mitchell, Edward A. D. ; Mozley-Stanridge, Sharon E. ; Parfrey, Laura W. ; Pawlowski, Jan ; Rueckert, Sonja ; Shadwick, Laura ; Schoch, Conrad L. ; Smirnov, Alexey ; Spiegel, Frederick W.

In: Journal of Eukaryotic Microbiology, 2012, vol. 59, no. 5, p. 429-514

This revision of the classification of eukaryotes, which updates that of Adl et al. [J. Eukaryot. Microbiol. 52 (2005) 399], retains an emphasis on the protists and incorporates changes since 2005 that have resolved nodes and branches in phylogenetic trees. Whereas the previous revision was successful in re-introducing name stability to the classification, this revision provides a...

Université de Neuchâtel

L and M edges of copper: Theory and experiment

Aebi, Philipp ; Erbudak, M. ; Vanini, F. ; Vvedensky, D. D. ; Kostorz, G.

In: Physical Review B, 1990, vol. 41, no. 17, p. 11760-11769

Characteristic electronic transitions and the associated fine structure in the near-edge region are investigated with electron-energy-loss spectroscopy for the copper L and M edges. In a single-particle scattering picture this fine structure represents the unoccupied density of states selected by the matrix elements. However, electronic processes can often complicate this simple...

Université de Neuchâtel

Complete Fermi surface mapping of Bi2Sr2CaCu2O8+x(001): Coexistence of short range antiferromagnetic correlations and metallicity in the same phase

Aebi, Philipp ; Osterwalder, Jürg ; Schwaller, P. ; Schlapbach, Louis ; Shimoda, M. ; Mochiku, T. ; Kadowaki, K.

In: Physical Review Letters, 1994, vol. 72, no. 17, p. 2757-2760

The Fermi surface of Bi2Sr2CaCu2O8+x(001) has been mapped at nearly 6000 points in k space using angle-resolved photoemission at 300 K. We observe both features that are in good agreement with the local density calculation of Massidda, Yu, and Freeman [Physica (Amsterdam) 158C, 251 (1988)] and others that are missing in the calculation....

Université de Fribourg

Controlling the supramolecular assembly of perfluorinated polycondensed aromatic hydrocarbons by side chain engineering

Aebischer, Olivier F. ; Jenny, Titus (Dir.) ; Weiss, Antoine (Codir.)

Thèse de doctorat : Université de Fribourg, 2007 ; Nr. 1575.

The possibilities of industry to process and to engineer materials at the nanometer level rapidly increase and products using materials engineered at the nanometer level emerge on the markets. In the long term, it is hardly possible to estimate, from the present point, where the ability to engineer materials on the nano-scale will lead human beings, whether the dream of a molecular nanotechnology...

Université de Fribourg

Controlling the lateral aggregation of perfluoroalkylated hexa-peri-hexabenzocoronenes

Aebischer, Olivier F. ; Aebischer, Annina ; Donnio, Bertrand ; Alameddine, Bassam ; Dadras, Massoud ; Güdel, Hans-Ulrich ; Guillon, Daniel ; Jenny, Titus A.

The investigation of two hexa-peri-hexabenzocoronene (HBC) derivatives carrying linear or branched perfluoroalkylated side chains is reported. Polycondensed aromatic hydrocarbons (PAH) such as HBC derivatives are well known to self-organize to form highly ordered monomolecular stacks, which in turn show a concentration- and solvent-dependent lateral aggregation. However, possible...

Université de Fribourg

Self-aggregated perfluoroalkylated hexa-peri-hexabenzocoronene fibers observed by cryo-SEM and fluorescence spectroscopy

Aebischer, Olivier F. ; Aebischer, Annina ; Tondo, Patrick ; Alameddine, Bassam ; Dadras, Massoud ; Güdel, Hans-Ulrich ; Jenny, Titus A.

In: Chemical Communications, 2006, p. 4221 - 4223

The self-assembled architectures in solution of a new HBC derivative bearing perfluoroalkylated side chains were investigated by optical excitation and emission spectroscopy and correlated to cryo-SEM, a new technique in organic chemistry.

Université de Fribourg

Synthesis of Novel Fluorinated Hexa-peri-hexabenzocoronenes

Aebischer, Olivier F. ; Tondo, Patrick ; Alameddine, Bassam ; Jenny, Titus A.

In: Synthesis, 2006, vol. 17, p. 2891–2896

The synthesis of several perfluoroalkylated hexabenzocoronene derivatives is described. The substituents range from linear semiperfluoroalkylated chains to branched perfluoroalkylated chains. Novel strategies were applied to overcome the low solubility and the low reactivity of such chains.

Université de Neuchâtel

Oxygen, carbon and strontium isotope systematics in two profiles across the Glarus thrust : implications for fluid flow

Abart, Rainer ; Badertscher, Nicolas P. ; Burkhard, Martin ; Povoden, Erwin

In: Contributions to Mineralogy and Petrology, 2002, vol. 143, p. 192-208

The Glarus thrust is a prominent tectonic feature in the eastern Helvetic Alps. It has been recognized as a potential major pathway for syntectonic crustal scale fluid flow. The oxygen, carbon and strontium isotope patterns obtained from two vertical profiles across the thrust indicate fundamentally different flow regimes in the southern section of the thrust, where the footwall is represented by...