It was shown in Part 1 that the amplitude of the spatially growing Tollmien-Schlichting wave generated by a time-harmonic free-stream disturbance is related to the coefficient multiplying the lowest-order Lam & Rott asymptotic eigensolution of the unsteady boundary-layer equation. In this part we use a numerical solution of the unsteady boundary-layer equation to determine that coefficient for the case of a uniformly pulsating stream.

Compounds (M: Al, Ga, Sc, In) as Followed by NMR and Impedance Spectroscopy. -As revealed by XRD, NMR, and impedance spectroscopy most of the trivalent cations of the title compounds are incorporated into the NASICON structure, increasing the amount of mobile lithium ions. Analysis of the quadrupole constant and spin-spin relaxation rate deduced from 7 Li NMR spectra of the Al-containing compound indicate the existence of two regimes associated with local and long-range motion of Li. At increasing temperature, correlated motions decrease, reducing activation energy of lithium motion. -(ARBI, K.; LAZARRAGA, M. G.; BEN HASSEN CHEHIMI, D.; AYADI-TRABELSI, M.; ROJO, J. M.; SANZ*, J.; Chem.

Volatile composition of different wine vinegars was investigated by GC-MS. Major volatile compounds were analyzed by direct injection of the sample into the gas chromatograph. The minor volatile components were fractionated by using the simultaneous distillation extraction technique (SDE) before their GC analysis. In both cases, previous neutralization of the sample was not required. Different types of vinegars resulting from conventional acetic fermentation processes as well as vinegars obtained by using the solera system (traditional Spanish process of the Jerez de la Frontera region) were analyzed.

Monodisperse hollow magnetite microspheres were successfully synthesized by an one-step process through a tem-plate-free hydrothermal approach employing simultaneously a mixture of FeCl₃.6H₂O and ferrocene as precursor and a propylene glycol-isopropanol mixture as solvent. The morphologies and properties of the magnetite microspheres were characterized by X-ray diffraction (XRD), Raman and infrared spectroscopy, field emission scanning electron microscopy (FE-SEM), X-ray photoelectron spectroscopy (XPS), adsorption of nitrogen (BET method) and SQUID magnetometry. The results show that the microspheres consist of a single crystalline phase of magnetite. On the other hand, the size and the internal hollow of the microspheres depend on the temperature of growth and can be tuned by modifying the synthesis conditions