Institution
University of Mons
Education•Mons, Belgium•
About: University of Mons is a education organization based out in Mons, Belgium. It is known for research contribution in the topics: Large Hadron Collider & Standard Model. The organization has 3073 authors who have published 9465 publications receiving 294776 citations.
Topics: Large Hadron Collider, Standard Model, Lepton, Fiber Bragg grating, Muon
Papers published on a yearly basis
Papers
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TL;DR: It was demonstrated that tube foot discs are very soft, have viscoelastic properties and adapt their surface to the substratum profile and show increased adhesion on a rough substratum in comparison to its smooth counterpart, which is due mostly to an increase in the geometrical area of contact between the disc and the surface.
Abstract: Echinoderms attach strongly and temporarily to the substratum by means of specialized organs, the podia or tube feet. The latter consist of a basal extensible cylinder, the stem, which bears an apical flattened disc. The disc repeatedly attaches to and detaches from the substratum through adhesive and de-adhesive secretions. In their activities, echinoderms have to cope with substrata of varying degrees of roughness as well as with changing hydrodynamic conditions, and therefore their tube feet must adapt their attachment strength to these environmental constraints. This study is the first attempt to evaluate the influence of substratum roughness on the temporary adhesion of echinoderm tube feet and to investigate the material properties of their contact surface. It was demonstrated that tube foot discs are very soft (E-modulus of 6.0 and 8.1 kPa for sea stars and sea urchins, respectively), have viscoelastic properties and adapt their surface to the substratum profile. They also show increased adhesion on a rough substratum in comparison to its smooth counterpart, which is due mostly to an increase in the geometrical area of contact between the disc and the surface. Tenacity (force per unit area) increases with roughness [e.g. 0.18 and 0.34 MPa on smooth polymethyl-methacrylate (PMMA), 0.21 and 0.47 MPa on rough PMMA for sea stars and sea urchins, respectively] if only the projected surface area of the adhesive footprint is considered. However, if this tenacity is corrected to take into account the actual substratum 3-D profile, surface roughness no longer influences significantly the corrected adhesion strength (e.g. 0.18 and 0.34 MPa on smooth PMMA, 0.19 and 0.42 MPa on rough PMMA for sea stars and sea urchins, respectively). It can be hypothesized that, under slow self-imposed forces, disc material behaves viscously to adapt to substratum roughness while the adhesive fills out only very small surface irregularities (in the nanometer range). It is deposited as a thin film ideal for generation of strong adhesion. Under short pulses of wave-generated forces, attached discs probably behave elastically, distributing the stress along the entire contact area, in order to avoid crack generation and thus precluding disc peeling and tube foot detachment.
119 citations
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TL;DR: In this paper, a joint experimental and theoretical investigation of the optical absorption spectra of phenylene vinylene oligomers is presented, which is well described by a simple model based on the Frank-Condon approximation but requires the use of at least two effective modes coupled to the electronic states.
119 citations
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TL;DR: In this paper, the existence of vector spaces of dimension at least two of continuous functions on (subsets of) R, every non-zero element of which admits one and only one absolute maximum is studied.
118 citations
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TL;DR: The mechanism by which molecular dopants donate free charge carriers to the host organic semiconductor is investigated and is found to be quite different from the one in inorganic semiconductors.
Abstract: The mechanism by which molecular dopants donate free charge carriers to the host organic semiconductor is investigated and is found to be quite different from the one in inorganic semiconductors. In organics, a strong correlation between the doping concentration and its charge donation efficiency is demonstrated. Moreover, there is a threshold doping level below which doping simply has no electrical effect. Copyright cop. 2012 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
118 citations
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TL;DR: In this article, the non-flat factor of the Godel metric belongs to a one-parameter family of (2 + 1)-dimensional geometries that also includes the anti-de Sitter metric.
Abstract: We show that the non-flat factor of the Godel metric belongs to a one-parameter family of (2 + 1)-dimensional geometries that also includes the anti-de Sitter metric. The elements of this family allow a generalization a la Kaluza-Klein of the usual (3 + 1)-dimensional Godel metric. Their lightcones can be viewed as deformations of the anti-de Sitter ones, involving tilting and squashing. This provides a simple geometric picture of the causal structure of these spacetimes, anti-de Sitter geometry appearing as the boundary between causally safe and causally pathological spaces. Furthermore, we construct a global algebraic isometric embedding of these metrics in (4 + 3)- or (3 + 4)-dimensional flat spaces, thereby illustrating in another way the occurrence of the closed timelike curves.
118 citations
Authors
Showing all 3115 results
Name | H-index | Papers | Citations |
---|---|---|---|
Giacomo Bruno | 158 | 1687 | 124368 |
Krzysztof Piotrzkowski | 141 | 1269 | 99607 |
Maria Elena Pol | 139 | 1414 | 99240 |
Rupert Leitner | 136 | 1201 | 90597 |
Christophe Delaere | 135 | 1320 | 96742 |
Vincent Lemaitre | 134 | 1310 | 99190 |
Jean-Luc Brédas | 134 | 1026 | 85803 |
Luiz Mundim | 133 | 1413 | 89792 |
Ulrich Landgraf | 131 | 959 | 83320 |
Markus Elsing | 131 | 1111 | 82757 |
Evangelos Gazis | 131 | 1147 | 84159 |
Loic Quertenmont | 129 | 905 | 76221 |
Michele Selvaggi | 129 | 1214 | 83525 |
Roberto Castello | 128 | 965 | 76820 |
Olivier Bondu | 128 | 1049 | 76124 |