A simple, clean, and environmentally benign three-component process for the synthesis of 2-amino-4Hchromenes using [mim]Cl, as an efficient catalyst under solvent-free conditions are described. A wide range of aromatic aldehydes easily undergoes condensations with 1-naphthol and malononitrile under solvent-free conditions to afford the desired products of good purity in excellent yields. Taking...

Grain production is one of the Ukrainian agro-industrial complex main branches. An indicator of the grain production efficiency is its profitability. It is characterized by significant annual fluctuations that induce risk. Redistribution of existing grain crops areas taking into consideration their profitability can bring to increase of production efficiency. The paper observes Markowitz’s opti...

Time-cost trade-off is one of the most important subjects in project management and of interest to contractors. The goal of time-cost trade-off is sensivity analysis of project costs to changes in activity duration in order to obtain the best combination of activity duration decrease, in a way that the sum of project costs is minimized. In the heuristics presented in this area, time crashing is...

Islam permits the consumption of meat of halal animals/birds, only when these have been slaughtered in the prescribed manner. This involves, while reciting the name of Allah, making a quick incision on the front of the neck to cut carotid arteries, jugular veins, windpipe and oesophagus. The prerequisites include laying the animal on its left flank, preferably facing towards Kibla. This enables...

la dissolution de l’u.r.s.s. en 1991 et le formation d’important consortiums pétroliers à la suite de la conclusion des contrats d’exploration et d’exploitation des hydrocarbures des fonds de la mer caspienne à partir des années 1993 et 1994 par les nouveaux pays riverains et successeurs de l’ex-u.r.s.s. à côté de l’iran, ont très vite succité de sérieuse interrogations relatives au statut juri...