The standard western music notation for the major and minor chords is available in the world. But the understanding of major and minor chords is very difficult for learning peoples particularly children's. It is very complicated to memory of all major and minor chords and also roots of all chords. This invention is easily understand by children and easily captured in standard piano and other instruments. The new method of conveying chords by numerical techniques is used in this invention. The octave notes are derived in to two different heads of major and minor chords by numerical method. There are two main equations are implemented and it is very easy to understanding of all major and minor chords.

Environmental concerns become increasingly evident as technology progresses and the world's population expands. Kitchen ventilation is a subdivision of ventilation that deals with the treatment of air from kitchens. Grease, fumes, and odours are all problems that kitchen ventilation solves. As a result, a cost-effective chimney was chosen to assist civilians. The primary components for venting the kitchen air are the filter, fan, flue, and duct. In this work, the new geometry duct design is improved and analysed by ANSYS. The volume of hot flue gas and discharge of hot flue gas are calculated theoretically and also recommended standard dimensions and geometry to the industry. Academic contributions to chimney advancements are recognised in this study endeavour, and a research deficit is identified based on these objectives.