http://hdl.handle.net/2268/154 Search this channel search http://orbi.ulg.ac.be/simple-search http://hdl.handle.net/2268/150678 Title: Vortex ratchet induced by controlled edge roughness <br/> <br/>Author, co-author: Cerbu, D.; Gladilin, V.N.; Cuppens, J.; Fritzsche, J.; Tempere, J.; Devreese, J. T.; Moshchalkov, V. V.; Silhanek, Alejandro; Van de Vondel <br/> <br/>Abstract: We demonstrate theoretically and experimentally the generation of rectified mean vortex displacement resulting from a controlled difference between the surface barriers at the opposite borders of a superconducting strip. Our investigation focuses on Al superconducting strips where, in one of the two sample borders, a saw tooth-like array of micro-indentations has been imprinted. The origin of the vortex ratchet effect is based on the fact that (i) the onset of vortex motion is mainly governed by the entrance/nucleation of vortices and (ii) the current lines bunching produced by the indentations facilitates the entrance/nucleation of vortices. Only for one current direction the indentations are positioned at the side of vortex entry and the onset of the resistive regime is lowered compared to the opposite current direction. This investigation points to the relevance of ubiquitous border effects typically neglected when interpreting vortex ratchet measurements on samples with arrays of local asymmetric pinning sites. Mon, 17 Jun 2013 15:53:45 GMT http://hdl.handle.net/2268/150676 Title: The rotational Predissociation of the CH4+ ion. <br/> <br/>Author, co-author: Flamme, J.P.; Wankenne, H.; Locht, Robert; Momigny, J.; Los, J.; Nowak, P.J.C.M. <br/> <br/>Abstract: The kinetic energy release distribution of the metastable transition corresponding to CH(D)4+->CH(D)3+ + H(D) dissociation has been measured using a duoplasmatron coupled with a tandem mass spectrometer. The metastable peak is modulated by discrete energy states assigned to vibro-rotational levels of CH(D)4+. Mon, 17 Jun 2013 15:27:57 GMT http://hdl.handle.net/2268/150522 Title: Energetic approach of the gas-cluster transition in microgravity <br/> <br/>Author, co-author: Opsomer, Eric; Ludewig, François; Vandewalle, Nicolas Sat, 15 Jun 2013 03:00:56 GMT http://hdl.handle.net/2268/150317 Title: Reconstruction de données satellitaires manquantes du lac Tanganyika <br/> <br/>Author, co-author: Leblanc, Christophe <br/> <br/>Abstract: Ce mémoire présente une technique de reconstruction des données manquantes du lac Tanganyika basée sur une version modifiée de l’algorithme de décomposition en EOFs (Empirical Orthogonal Functions) et qui consiste en l’utilisation d’une généralisation du théorème SVD (Singular Value Decomposition) des matrices aux tenseurs d’ordre trois. Les performances de ces deux algorithmes sont ensuite comparées sur les données satellitaires du lac Tanganyika fournies par Yves Cornet*, le but étant de reconstruire ces données sur toute la surface du lac. *Université de Liège Département de géographie / Unité de Géomatique - Télédétection et photogrammétrie. ycornet@ulg.ac.be Thu, 13 Jun 2013 07:08:48 GMT http://hdl.handle.net/2268/150192 Title: Melting of a confined monolayer of magnetized beads <br/> <br/>Author, co-author: Schockmel, Julien; Mersch, Eric; Vandewalle, Nicolas; Lumay, Geoffroy Tue, 11 Jun 2013 11:14:05 GMT http://hdl.handle.net/2268/150170 Title: Self-coverage of Leidenfrost droplets <br/> <br/>Author, co-author: Maquet, Laurent; colinet, pierre; Moreau, Florian; Dorbolo, Stéphane Tue, 11 Jun 2013 08:47:03 GMT http://hdl.handle.net/2268/150168 Title: Self-coverage of Leidenfrost droplets <br/> <br/>Author, co-author: Maquet, Laurent; colinet, pierre; Moreau, Florian; Dorbolo, Stéphane Tue, 11 Jun 2013 08:45:22 GMT http://hdl.handle.net/2268/150091 Title: Hyperfine-structure splitting of the 716 nm R(90)3–10 molecular iodine transition <br/> <br/>Author, co-author: Huet, Nicolas; Krins, Stéphanie; Dubé, Pierre; Bastin, Thierry <br/> <br/>Abstract: We report on the hyperfine-structure splitting of the 716 nm R 90 3–10 molecular iodine transition. We show that this particular iodine line provides a very useful frequency reference in the context of a laser cooling experiment of iron atoms, an atomic species that has so far never been laser cooled and trapped to our knowledge. We provide experimental values for the hyperfine constants ΔeQq and ΔC of the investigated iodine transition. Dispersive signals of this transition are also presented and used to lock the frequency of a Ti:sapphire laser. The reported stabilization performance is fully compatible with the requirements of a laser cooling experiment of iron atoms. Mon, 10 Jun 2013 11:08:30 GMT http://hdl.handle.net/2268/149993 Title: Laser Cooling of Iron Atoms <br/> <br/>Author, co-author: Huet, Nicolas; Krins, Stéphanie; Bastin, Thierry <br/> <br/>Abstract: We report on the first laser cooling of Iron atoms. Our laser cooling setup makes use of 2 UV laser radiations sent colinearly in a 0.8 m Zeeman slower. One laser is meant for optical pumping of the Iron atoms from the ground state to the lowest energy metastable state. The second laser cools down the atoms using a quasi-perfect closed transition from the optically pumped metastable state. The velocity distribution at the exit of the Zeeman slower is obtained from a probe laser crossing the atomic beam at an angle of 50 degrees. The fluorescence light is detected using a photomultiplier tube coupled with a boxcar analyzer. The Iron atom beam is produced with a commercial effusion cell working at around 1600°C. Our laser radiations are stabilized using standard saturated-absorption signals in both an Iron hollow cathode absorption cell and an Iodine cell. Thu, 06 Jun 2013 15:51:21 GMT http://hdl.handle.net/2268/149992 Title: Thermodynamical study of liquid helium II <br/> <br/>Author, co-author: Hulst, René; Gommes, Cédric; Lebon, G Thu, 06 Jun 2013 15:31:43 GMT http://hdl.handle.net/2268/149983 Title: Comparison of different methods for characterizing multi-walled carbon nanotubes <br/> <br/>Author, co-author: Gommes, Cédric; BLACHER, Silvia; Pirard, Jean-Paul; Bossuot, Christophe; Dupont-Pavlovski, Nicole Thu, 06 Jun 2013 15:04:19 GMT http://hdl.handle.net/2268/149981 Title: Time-resolved SAXS measurements of phase separation during silica gel formation <br/> <br/>Author, co-author: Gommes, Cédric; Goderis, Bart; Pirard, Jean-Paul; Blacher, Silvia; Basiura, Monika Thu, 06 Jun 2013 14:58:25 GMT http://hdl.handle.net/2268/149980 Title: Phase separation during silica gel formation followed by time-resolved SAXS <br/> <br/>Author, co-author: Gommes, Cédric; Goderis, Bart; Pirard, Jean-Paul; BLACHER, Silvia Thu, 06 Jun 2013 14:55:25 GMT http://hdl.handle.net/2268/149979 Title: About the non monotonic evolution of the invariant Q during the polymerization induced phase separation of silica <br/> <br/>Author, co-author: Gommes, Cédric; goderis, Bart; Pirard, Jean-Paul; BLACHER, Silvia Thu, 06 Jun 2013 14:52:35 GMT http://hdl.handle.net/2268/149976 Title: Qualitative assessment of the purity of multi-walled carbon nanotubes samples using krypton adsorption; <br/> <br/>Author, co-author: Gommes, Cédric; noville, Francis; Pirard, Jean-Paul Thu, 06 Jun 2013 14:45:07 GMT http://hdl.handle.net/2268/149885 Title: Dynamiques complexes de rebonds d'une goutte placée sur un bain vibré: résonances et anti-résonances <br/> <br/>Author, co-author: Hubert, Maxime; Vandewalle, Nicolas <br/> <br/>Abstract: We present herebelow a model for bouncing droplets consisting of two masses joined by a spring and a damper bouncing onto an oscillating plate. We analyze the dynamics through the bouncing threshold and spatio-temporal diagrams. We obtain an analytic expression for the threshold. Resonance and Anti-resonance phenomena are found and investigated. The behavior of the bouncing spring is compared to the bouncing droplet dynamics. In particular, key features of the bouncing droplet dynamics are reproduced. Wed, 05 Jun 2013 15:22:38 GMT http://hdl.handle.net/2268/149849 Title: Characterization of gels via solvent desorption measurements <br/> <br/>Author, co-author: Gommes, Cédric; Noville, Francis; Pirard, Jean-Paul Wed, 05 Jun 2013 11:32:58 GMT http://hdl.handle.net/2268/149848 Title: Dimensionnement et modélisation d'une micro-centrale solaire <br/> <br/>Author, co-author: Dumont, Olivier Wed, 05 Jun 2013 11:22:09 GMT http://hdl.handle.net/2268/149846 Title: Determination of the coordination number of particulate nano-materials using nitrogen adsorption <br/> <br/>Author, co-author: Gommes, Cédric; Ravikovitch, Peter; Neimak, Alex Wed, 05 Jun 2013 11:16:21 GMT http://hdl.handle.net/2268/149845 Title: Analysis of 3DTEM and SAXS of ordered mesoporous silica with the same stochastic morphological model <br/> <br/>Author, co-author: Gommes, Cédric; Friedrich, Heiner; Wolters, Mariska; de Jongh, Petra; de Jong, Krijn Wed, 05 Jun 2013 11:13:54 GMT