A hot wire method for measuring turbulence in transonic or supersonic heated flows

This work presents a method for measuring fluctuating quantities such as temperature or velocity using a constant current hot wire anemometer. The scope of this method has been extended to include not only supersonic flows, but also transonic flows with low Reynolds numbers and transonic or supersonic heated flows. After examining the dependence of the different coefficients of sensitivity to aerodynamic and thermal parameters, the result of the study was applied to a turbulent boundary layer using a suitable processing method.     

The stability inL q of theL 2-projection into finite element function spaces

Numerische Mathematik - The stability ofL 2-projection into many standard finite element spaces as a map intoL q , 1≦q≦∞, is demonstrated. TheL 2-projection ofu∈L q is shown...     

Un nouvel hétérocycle telluré: le benzisotellurazole-1,2. 2. Structure cristalline et moléculaire du benzisoselenazole-1,2 et du benzisotellurazole-1,2

Anomalous physical properties (solubility and melting point) of 1,2-benzisotellurazole are explained by very short intermolecufar Te…N bonds (2.4 Å) found in the crystal structure. Such bonds are not present in the crystal structure of 1,2-benzisoselenazole and the physical properties are those expected.     

Addition of activated olefins to cyclic N-acyliminium ions in ionic liquids

Organoindate(III) ionic liquid (BMI·InCl₄) was successfully employed in the nucleophilic addition of allyltrimethylsilane, silyl enol ethers and ketene silyl acetals to in situ generated cyclic N-acyliminium ions at room temperature without the need of an external Lewis acid. The corresponding α-substituted heterocycles were obtained in good yields and the recovered ionic liquid phase could be reused at least three times.