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101.
Benedicte Soulet Annick Tauxe Joseph Tarradellas 《International journal of environmental analytical chemistry》2013,93(10):659-667
Five acidic drugs (clofibric acid, ibuprofen, ketoprofen, mefenamic acid and diclofenac) were chosen in order to determine their behavior in a sewage treatment plant (STP). An analytical method using solid phase extraction (SPE) and a gas chromatograph coupled with a mass spectrometer (GC-MS) was used. The results show that four pharmaceuticals (clofibric acid, ketoprofen, mefenamic acid and diclofenac) are not well removed by treatment in Swiss STPs. Maximum concentration in the effluent was determined for mefenamic acid up to 1.0 µg/L. This component seems to be relevant in Swiss STPs effluents and we can expect its presence in surface waters. 相似文献
102.
Rik Dillen Ann De Vyt Chris Xhoffer Elke Leunis Serge Claessens Annick Dhont 《Mikrochimica acta》2004,145(1-4):29-39
For the development of ultra high strength steel and hyperdrawable steel grades precipitates had to be tailored at the nanoscale. Microbeam techniques helped to reach a superior quality of metallic coatings and a superb adhesion to the steel substrate. In this paper the use of micro-analytical techniques in steel product development is illustrated. 相似文献
103.
Chien-Yuan Wang Valerie Paul-Boncour Chia-Cheng Kang Ru-Shi Liu Stanislaw M. Filipek Maria Dorogova Iryna Marchuk Toshiya Hirata Annick Percheron-Guegan Hwo-Shuenn Sheu Ling-Yun Jang Jin-Ming Chen Hung-Duen Yang 《Solid State Communications》2004,130(12):815-820
The novel intermetallic deuteride YMn2D6 was synthesized under high deuterium pressure. In order to identify the structure and characterize the magnetic properties of this deuteride the powder X-ray diffraction (XRD), high-resolution transmission electron microscopy (HRTEM), Mn X-ray absorption near edge structure (XANES) and magnetization measurement (SQUID) were carried out. The crystal structure, the chemical state of Mn and the magnetic properties of this novel deuteride were examined and discussed. It should be noted that the structure of YMn2D6 (F-43m) differs dramatically from C15 symmetry of the parent material. Such a great rearrangement of the metal lattice due to deuterium absorption is rather exceptional for C15 Laves phase. 相似文献
104.
Douglas Gouvêa Gilberto J. PereiraLéon Gengembre Marlu C. SteilPascal Roussel Annick RubbensPilar Hidalgo Ricardo H.R. Castro 《Applied Surface Science》2011,257(9):4219-4226
In this work, we experimentally showed that the spontaneous segregation of MgO as surface excess in MgO doped SnO2 nanoparticles plays an important role in the system's energetics and stability. Using X-ray fluorescence in specially treated samples, we quantitatively determined the fraction of MgO forming surface excess when doping SnO2 with several different concentrations and established a relationship between this amount and the surface energy of the nanoparticles using the Gibbs approach. We concluded that the amount of Mg ions on the surface was directly related to the nanoparticles total free energy, in a sense that the dopant will always spontaneously distribute itself to minimize it if enough diffusion is provided. Because we were dealing with nanosized particles, the effect of MgO on the surface was particularly important and has a direct effect on the equilibrium particle size (nanoparticle stability), such that the lower the surface energy is, the smaller the particle sizes are, evidencing and quantifying the thermodynamic basis of using additives to control SnO2 nanoparticles stability. 相似文献
105.
Sylvain Tridon Stéphane Barre Gabriel Dan Ciocan Laurent Tomas 《European Journal of Mechanics - B/Fluids》2010,29(4):321-335
The draft tube of a hydraulic turbine is the component where the flow exiting the runner is decelerated, thereby converting the excess of kinetic energy into static pressure. In the case of machine refurbishment of an existing power plant, most of the time only the runner and the guide vanes are currently modified. For financial and safety reasons, the spiral casing and the draft tube are seldom redesigned, even if these components present some undesirable behaviour. In some cases, the installation of an upgraded runner leads to a peculiar and undesirable efficiency drop as the discharge is increased above the best efficiency point value. It is found to be related to a corresponding sudden variation in the draft tube pressure recovery coefficient at the same discharge.The swirling flow exiting the runner is complex and highly turbulent. The radial velocity is rarely measured because a quite complicated measurement setup is needed. However, this velocity component is greatly needed in order to properly initialize the numerical simulations, and its influence is important in spite of its small magnitude. Velocity measurements downstream of the runner include radial component made at CREMHyG (Grenoble) by LDV, and PIV techniques are presented. An analytical formulation for this velocity component based on the formulation for the conical diffuser and on the three vortices structure is proposed and compared with measurements. 相似文献
106.
Jon Ustarroz Uma Gupta Annick Hubin Sara Bals Herman Terryn 《Electrochemistry communications》2010,12(12):1706-1709
An innovative experimental approach to study the electrodeposition of small nanoparticles and the early stages of electrochemical nucleation and growth is presented. Carbon coated gold TEM grids are used as substrates for the electrodeposition of silver nanoparticles so that electrochemical data, FESEM, HAADF–STEM and HRTEM data can be acquired from the same sample without the need to remove the particles from the substrate. It is shown that the real distribution of nanoparticles cannot be resolved by FESEM whereas HAADF–STEM analysis confirms that a distribution of ‘small’ nanoparticles (d ≈ 1–2 nm) coexist with ‘large’ nanoparticles corresponding to a bimodal size distribution. Besides, particles grown under the same conditions have been found to present different structures such as monocrystals, polycrystals or aggregates of smaller particles. 相似文献
107.
Pedro Maciel Thomas Nierhaus Steven Van Damme Heidi Van Parys Johan Deconinck Annick Hubin 《Electrochemistry communications》2009,11(4):875-877
A new model for gas evolving electrodes is proposed, in which the gas evolution reaction is driven by the supersaturation of dissolved gas. 相似文献
108.
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110.
Flora Tomasoni Heidi van Parys Herman Terryn Annick Hubin Johan Deconinck Jean-Marie Buchlin Jeroen van Beeck 《Electrochemistry communications》2010,12(1):156-159
Bubble evolution during AC-graining is analysed in combination with the variation of the anodic peaks of the potential and the electrode surface morphology. Aluminium samples are grained in hydrochloric acid in an Inverted Rotating Disk Electrode. A roughness tester is used to characterise the electrode surface, while shadow imaging is applied to determine the bubble size distribution. An interpretation of the correlation existing among bubble size, potential peaks evolution, surface properties and smut layer formation is proposed, which provides insights into the mechanisms involved in bubble formation. 相似文献