This paper describes a simple but effective hierarchically divisive colormap design technique for color image quantization. By sorting colors based on their components along the principal axis, the one with the highest variance of color distribution, the Euclidean distances between any adjacent colors’ along the axis are used to find the cutting plane that is perpendicular to the axis and divid...

Roadheaders offer a unique capability and flexibility for the excavation of soft to medium strength rock formations, therefore, are widely used in underground mining and tunneling operations. A critical issue in successful roadheader application is the ability to develop accurate and reliable estimates of machine production capacity and the associated bit costs. This paper presents and discusse...

thermomechanical control process steel produced by rolling has a significant anisotropy. the elongated grains and inclusions formed during hot rolling of ferrite and low carbon hsla steels directly influence the anisotropy of the steel’s mechanical properties as a result of microstructural anisotropy. the present research deals with this anisotropy, and particular attention has been paid to the...

Abstract According to the seafloor drill working conditions and complex formation characteristics of seafloor, this paper aims improve adaptability diamond bit coring quality. The cutter tooth design scheme impregnated is proposed, Fluent analyzes flow field drilling fluid at bottom hole. results show that cone cutting with primary assistant nozzles can directly avoid 85.33% flushing core reduc...

the investigation was conducted on wet and dry seasons of ethiopia during the year 2012/2013 at wondo genet agricultural research center nursery site. four levels of cutting size and three levels of cutting positions were arranged in randomized complete block design with three replications. data on seedling height, branch number/seedling, root number/seedling, root weigh/seedling, root length/s...

Introduction. Torsional vibrations caused by drilling using a polycrystalline diamond compact (PDC) bit are analysed wellbore data obtained under various modes. The torsional analysed. Two types of vibrations, including those the cutting action and frictional forces. Aim. To investigate induction as result rock destruction PDC bits. Materials methods. research methodology was based on “Richard-...