Exceptional activity of gallium(III) chloride and chlorogallate(III) ionic liquids for Baeyer–Villiger oxidation

The extremely high activity of chlorogallate(iii) ionic liquids and GaCl3 in promoting Baeyer–Villiger oxidation of cyclic ketones with H2O2 to lactones is reported.</p

Passive radar for GMTI

The tasks of clutter suppression and ground moving target indication are a typical and also very challenging problem for airborne radar systems for both defence and civilian applications. Nowadays, research aims at applying these tasks for passive radar systems on moving platforms. This chapter addresses the problem of clutter cancellation and slowly moving target detection in orthogonal-frequency-division-multiplex-based passive radar systems mounted on moving platforms. Conventional signal processing approaches which exploit multiple receiving channels can be ineffective for the considered application due to the impossibility to control the employed waveform of opportunity. Therefore, a processing scheme, which aims at ground moving target indication needs to address this issue. The space-time adaptive processing scheme, proposed in this Chapter, exploits the benefits of the reciprocal filtering strategy applied at a range compression stage together with a flexible displaced phase center antenna approach. The effectiveness of the proposed scheme is demonstrated via application to a simulated dataset as well as on experimental data collected by a multichannel passive radar on an airborne moving platform

Silica-supported chlorometallate(III) ionic liquids as recyclable catalysts for Diels–Alder reaction under solventless conditions

The first catalytic application of supported chlorometallate(iii) ionic liquids as recyclable heterogeneous catalysts for a Diels–Alder reaction under solventless conditions.</p

Passive STAP approaches for GMTI

This chapter is concerned with the study of signal processing techniques and operational strategies for passive radar systems mounted onboard moving platforms and aimed at ground moving target indication (GMTI) applications. Specifically, the attention is focused on space-time adaptive processing (STAP) methodologies for systems equipped with multiple channels on receive. The spatial degrees of freedom are adaptively exploited for space-time clutter cancellation and slow-moving target detection and direction of arrival estimation. Specific solutions are devised and integrated into the typical signal processing architecture of passive radar to address the main limitations deriving from the passive bistatic framework

Highly Active Nanobiocatalyst from Lipase Noncovalently Immobilized on Multiwalled Carbon Nanotubes for Baeyer–Villiger Synthesis of Lactones

A new method for the chemo-enzymatic Baeyer–Villiger oxidation of cyclic ketones to lactones in the presence of a new heterogeneous nanobiocatalyst consisting of Candida antarctica lipase B immobilized on multiwalled carbon nanotubes (MWCNTs) has been developed. To ensure safety and meet the contemporary environmental criteria nanobiocatalyst was used for the in situ generation of peracid, thereby avoiding the direct handling of dangerous peroxy substance. The reaction was carried out under mild conditions at 20–40 °C using 30% aq H₂O₂ as the primary oxidant, with octanoic acid as the precursor of peracid. The influence of the reaction parameters and various carbon materials as supports were studied. The activities of the new biocatalysts were compared with the benchmark Novozyme-435. Recycling studies demonstrated the possibility of utilizing the most active MWCNTs-lipase biocatalyst five times without any significant loss of activity. The main advantage of this study is the superior activity of the new nanobiocatalyst, what caused a significant reduction of reaction times compared to those previously reported in the literature