Extracting scintillations from satellite beacon propagation data

Beacon measurements on a moderate elevation satellite link at 20 and 30 GHz during concurrent scintillation and rain attenuation are analyzed. The spectra of the two beacon signals are compared and scintillation amplitudes are extracted from the raw beacon data using a high-pass filter set at 14 different cutoff frequencies f_c ranging between 2-400 mHz. The effect on scintillation statistics of the choice of f_c and the dependence of this choice on path elevation angle are discussed     

Action of Grignard Reagents on N-Arylcitraconimides and Substituted hydroxypyrrolinones

Arylmagnesium bromides react with N-arylcitraconimides at room temperature, to give 5-aryl-5-hydroxy-3-methyl-N-aryl-2-pyrrolinones 1 , which can be considered as the cyclic form of cis-β-aroyl-α-methyl-N-arylacrylamides, as the sole product. The structure assignments are based on infrared and electronic spectra and also on the synthesis of these compounds by the isomerisation of the corresponding trans-isomers 3 which are synthesised by the reaction between trans-β-aroyl acryloyl chlorides and amines. Arylmagnesium halides react with 1 to give β-aroyl-β-aryl-α-methyl-N-arylpropionamides 5 as the sole product in most cases. However, in few cases a poor yield of an isomeric substance 5′ is obtained in addition to the predominating isomers. 5a, c, e and j are also obtained by the action of 3 moles of the suitable Grignard reagent on one mole of N-arylcitra-conimide. Structural assignments are based on infrared, electronic and nuclear magnetic resonance spectra.