Управление процессом дуговой сварки покрытыми электродами воздействием на параметры режима

В процессе проведения экспериментальных исследований определена степень влияния импульсного изменения энергетических параметров на стабильность тепломассопереноса при дуговой сварке и наплавке покрытыми электродами. Определено влияние амплитудно-временных параметров режима на условия формирования сварного шва и наплавленного металла, а также критерии выбора специализированного сварочного оборудования.In the course of experimental studies, the degree of influence of the pulse change of energy parameters on the stability of heat and mass transfer in arc welding and surfacing with covered electrodes is determined. The influence of the amplitude-time parameters of the regime on the conditions of formation of the weld and weld metal, as well as the criteria for the selection of specialized welding equipment

Asymmetrische Synthese von Dehydropiperidinonen und polysubstituierten Pyrrolidinen

Nitrogen containing heterocycles are an important class of organic compounds due to their interesting pharmacological properties. Therefore, the aim of this research project was to develop a new asymmetric pathway to yield dehydropiperidinones and pyrrolidines. The synthesis of dehydropiperidinones succeeded via a thiourea catalyzed Mannich aza-Achmatowicz reaction sequence. Furthermore, an efficient domino Mannich aza-Michael reaction towards the synthesis of polyfunctionalized pyrrolidines was developed

Asymmetrische Synthese von Dehydropiperidinonen und polysubstituierten Pyrrolidinen

Nitrogen containing heterocycles are an important class of organic compounds due to their interesting pharmacological properties. Therefore, the aim of this research project was to develop a new asymmetric pathway to yield dehydropiperidinones and pyrrolidines. The synthesis of dehydropiperidinones succeeded via a thiourea catalyzed Mannich aza-Achmatowicz reaction sequence. Furthermore, an efficient domino Mannich aza-Michael reaction towards the synthesis of polyfunctionalized pyrrolidines was developed