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See detailElectronic nose for reactor stability monitoring of an agricultural co-digestion biogas plant
Adam, Gilles ULg; Lemaigre, Sébastien; Delfosse, Philippe et al

in Progress in Biogas III - Biogas Production from agricultural biomass and organic residues (2014, September)

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See detailElectronic properties and quantum transport in Graphene-based nanostructures
Dubois, Simon; Zanolli, Zeila ULg; Declerck, Xavier et al

in European Physical Journal B -- Condensed Matter (2009), 72(1), 1-24

Carbon nanotubes (CNTs) and graphene nanoribbons (GNRs) represent a novel class of low-dimensional materials. All these graphene-based nanostructures are expected to display the extraordinary electronic ... [more ▼]

Carbon nanotubes (CNTs) and graphene nanoribbons (GNRs) represent a novel class of low-dimensional materials. All these graphene-based nanostructures are expected to display the extraordinary electronic, thermal and mechanical properties of graphene and are thus promising candidates for a wide range of nanoscience and nanotechnology applications. In this paper, the electronic and quantum transport properties of these carbon nanomaterials are reviewed. Although these systems share the similar graphene electronic structure, confinement effects are playing a crucial role. Indeed, the lateral confinement of charge carriers could create an energy gap near the charge neutrality point, depending on the width of the ribbon, the nanotube diameter, the stacking of the carbon layers regarding the different crystallographic orientations involved. After reviewing the transport properties of defect-free systems, doping and topological defects (including edge disorder) are also proposed as tools to taylor the quantum conductance in these materials. Their unusual electronic and transport properties promote these carbon nanomaterials as promising candidates for new building blocks in a future carbon-based nanoelectronics, thus opening alternatives to present silicon-based electronics devices. [less ▲]

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See detailElectronic Properties as a Function of Ag/Sb Ratio in Ag1-yPb18Sb1+zTe20 Compounds
Dadda, Jayaram; Mueller, Eckhard; Klobes, Benedikt et al

in Journal of Electronic Materials (2012), 41(8), 2065-2072

In this study efforts have been made to optimize the electronic properties such as the electrical conductivity and Seebeck coefficient of Ag1- (y) Pb18Sb1+ (z) Te-20 (lead-antimony-silver-tellurium, LAST ... [more ▼]

In this study efforts have been made to optimize the electronic properties such as the electrical conductivity and Seebeck coefficient of Ag1- (y) Pb18Sb1+ (z) Te-20 (lead-antimony-silver-tellurium, LAST-18) compounds by systematically varying the Ag and Sb compositions with constant Pb/Te ratio. It was found that increasing the content of Sb relative to Ag raised the charge carrier density (n) and thereby the electrical conductivity and power factor. The results indicate that, for deficient Ag, the excess trivalent Sb atoms occupy divalent Pb sites in the unit cell, increasing the value of n in the system. It was established that the Seebeck coefficient decreases with increasing n indicating a dominant acoustic phonon scattering mechanism in the current alloys. The results demonstrate that the interaction between Ag and Sb atoms plays a major role in determining the electronic properties in the current Ag1-y Pb18Sb1+z Te-20 compounds. [less ▲]

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See detailElectronic properties of simple metals, electronegativity scales and alloy formation
Magain, Pierre ULg; Heinrichs, J.

in Physica B: Condensed Matter (1982), 112

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See detailElectronic properties of the Mg2Si thermoelectric material investigated by linear-response density-functional theory
Boulet; Verstraete, Matthieu ULg; Crocombette et al

in Computational Materials Science (2011), 50(3), 847-851

This paper presents Density-Functional Perturbation Theory (DFPT) calculations on the electronic, vibrational, and electron–phonon (EP) coupling properties of the Mg2Si thermoelectric compound. The DFPT ... [more ▼]

This paper presents Density-Functional Perturbation Theory (DFPT) calculations on the electronic, vibrational, and electron–phonon (EP) coupling properties of the Mg2Si thermoelectric compound. The DFPT yields very satisfactory results for the electronic and vibrational properties when compared to experiment. Regarding the EP interactions, as far as we know, they have never been reported so far. We show that the EP interactions in Mg2Si mainly involve the silicon atom. This result explains the improvement of the thermoelectric properties of Mg2Si using a solid solution Mg2Si1−xAx, where A is a heavier atom than Si. By guiding the choice of the substitution site, the study of the EP coupling properties could be used in the search of new thermoelectric materials based on solid solutions. [less ▲]

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See detailElectronic properties of U2Ni2Sn
Kindo, Koichi; Fukushima, T.; Kumada, T. et al

in Journal of Magnetism & Magnetic Materials (1995), 140-144(2), 1369-1370

We report on the bulk electronic properties of U2Ni2Sn, which crystallizes in the tetragonal U3Si2 structure. Pronounced anomalies in the temperature dependencies of magnetic susceptibility, specific heat ... [more ▼]

We report on the bulk electronic properties of U2Ni2Sn, which crystallizes in the tetragonal U3Si2 structure. Pronounced anomalies in the temperature dependencies of magnetic susceptibility, specific heat and electrical resistivity indicate magnetic ordering below TN = 26 K. An antiferromagnetic ground state is corroborated by the occurrence of three metamagnetic transitions at about 30, 39 and 51 T in the field dependence of the magnetization. The lack of any saturation tendency in the highest field applied (57 T) may suggest further transition(s) to occur in even higher fields. [less ▲]

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See detailElectronic properties of U2Ni2Sn
Kindo, Koichi; Fukushima, T.; Kumada, T. et al

Poster (1994, August)

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See detailElectronic specific heat of superconductors with Van Hove singularities : Effect of a magnetic field and thermal fluctuations
Dorbolo, Stéphane ULg; Ausloos, Marcel ULg; houssa, michel

in Physical Review. B : Condensed Matter (1998), 57

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See detailElectronic Speckle Pattern Interferometry at Long Infrared Wavelengths. Scattering Requirements
Vandenrijt, Jean-François ULg; Thizy, Cédric ULg; Alexeenko, Igor et al

in Osten, Wolfgang; Kujawinska, Malgorzata (Eds.) Fringe 2009 (2009, September)

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See detailElectronic Speckle Pattern Interferometry at Long Wave Infrared Wavelengths. Scattering Requirements
Vandenrijt, Jean-François ULg; Thizy, Cédric ULg; Alexeenko, Igor et al

in Fringe 2009 (2009, September)

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See detailElectronic spectroscopy of nucleic acids in the gas phase
Gabelica, Valérie ULg; Rosu, Frédéric ULg; Joly, Laure ULg et al

Conference (2010)

DNA polyanions trapped in a mass spectrometer undergo electron detachment following UV irradiation. Photodetachment is a single-photon process. Its efficiency depends on the nature of the DNA bases, the ... [more ▼]

DNA polyanions trapped in a mass spectrometer undergo electron detachment following UV irradiation. Photodetachment is a single-photon process. Its efficiency depends on the nature of the DNA bases, the ion's charge, and the excitation wavelength. Photodetachment can therefore be used to perform ion spectroscopy experiments, which probe electronic excitation within the initial charge state of the nucleic acids. Ion spectroscopy experiments on trapped nucleic acid cations and anions were performed from 4 to 20 eV using an OPO laser or using synchrotron radiation. Photoelectron spectroscopy experiments were also performed on multiply charged anions to probe direct detachment cross sections and electronic excitations within the final charge. The electronic spectra obtained from photodetachment integral cross sections show several resonances, provided that the photon energy is larger than the electron binding energy. We will also discuss whether the electronic spectra obtained via photodetachment can be used to probe gas phase ion structure. [less ▲]

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See detailThe electronic states of 2-furanmethanol (furfuryl alcohol) studied by photon absorption and electron impact spectroscopies
Giuliani, A.; Walker, I. C.; Delwiche, Jacques ULg et al

in Journal of Chemical Physics (2003), 119(14), 7282-7288

The photoelectron spectrum of 2-furanmethanol (furfuryl alcohol) has been measured for ionization energies between 8 and 11.2 eV and the first three ionization bands assigned to pi(3), pi(2), and n(o ... [more ▼]

The photoelectron spectrum of 2-furanmethanol (furfuryl alcohol) has been measured for ionization energies between 8 and 11.2 eV and the first three ionization bands assigned to pi(3), pi(2), and n(o) ionizations in order of increasing binding energy. The photoabsorption spectrum has been recorded in the gas phase using both a synchrotron radiation source (5-9.91 eV, 248-125 nm) and electron energy-loss spectroscopy under electric-dipole conditions (5-10.9 eV, 248-90 nm). The (UV) absorption spectrum has also been recorded in solution (4.2-6.36 eV, 292-195 nm). The electronic excitation spectrum appears to be dominated by transitions between pi and pi* orbitals in the aromatic ring, leading to the conclusion that the frontier molecular orbitals of furan are affected only slightly on replacement of a H atom by the -CH2OH group. Additional experiments investigating electron impact at near-threshold energies have revealed two low-lying triplet states and at least one electron/molecule shape resonance. Dissociative electron attachment also shows to be widespread in furfuryl alcohol. (C) 2003 American Institute of Physics. [less ▲]

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See detailElectronic structure of Ag-Pd heterostructures
Verstraete, Matthieu ULg; Dumont, Jacques; Mirabella, Frédéric et al

in Computational Materials Science (2004), 30

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See detailElectronic structure of thallium filled skutterudites studied by x-ray absorption and Mossbauer spectroscopy
Long, G. J.; Mahieu, B.; Sales, B. C. et al

in Journal of Applied Physics (2002), 92(12), 7236-7241

Thallium L-III-edge x-ray absorption and iron-57 and tin-119 Mossbauer spectral measurements have been carried out to probe the electronic structure of the three sites in the filled skutterudite TlxCo4 ... [more ▼]

Thallium L-III-edge x-ray absorption and iron-57 and tin-119 Mossbauer spectral measurements have been carried out to probe the electronic structure of the three sites in the filled skutterudite TlxCo4-yFeySb12 and TlxCo4Sb12-zSnz compounds with a range of x, y, and z values. The thallium L-III-edge x-ray absorption spectra are independent of x, y, and z and are well reproduced by full multiple scattering calculations with a cluster with a radius of 8.5 Angstrom centered on thallium. The iron-57 Mossbauer spectra consist of two doublets and the major component is assigned to iron on the cobalt sublattice in view of its hyperfine parameters. The origin of the minor component is uncertain and is tentatively assigned to either iron with thallium vacancies as next nearest neighbors or to iron in the voids. The tin-119 Mossbauer spectral hyperfine parameters clearly indicate that tin substitutes for antimony in the skutterudite structure. Further, the tin electronic configuration is very similar to that of antimony and is insensitive to the thallium content. (C) 2002 American Institute of Physics. [less ▲]

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See detailAn electronic time scale in chemistry
Remacle, Françoise ULg; Levine, R. D.

in Proceedings of the National Academy of Sciences of the United States of America (2006), 103(18), 6793-6798

Ultrafast, subfemtosecond charge migration in small peptides is discussed on the basis of computational studies and compared with the selective bond dissociation after ionization as observed by Schlag and ... [more ▼]

Ultrafast, subfemtosecond charge migration in small peptides is discussed on the basis of computational studies and compared with the selective bond dissociation after ionization as observed by Schlag and Weinkauf. The reported relaxation could be probed in real time if the removal of an electron could be achieved on the attosecond time scale. Then the mean field seen by an electron would be changing rapidly enough to initiate the migration. Tyrosine-terminated tetrapeptides have a particularly fast charge migration where in < 1 fs the charge arrives at the other end. A femtosecond pulse can be used to observe the somewhat slower relaxation induced by correlation between electrons of different spins. A slower relaxation also is indicated when removing a deeper-lying valence electron. When a chromophoric amino acid is at one end of the peptide, the charge can migrate all along the peptide backbone up to the N end, but site-selective ionization is probably easier to detect for tryptophan than for tyrosine. [less ▲]

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See detailL'électronique au service de la détection des chaleurs.
Hanzen, Christian ULg

in Hebdo Vétérinaire (2000), 32

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