the aim of this article is to extend the study of the lorentz transformation of order (m,n) from m=1 and n>=1 to all m,n>=1, obtaining algebraic structures called a bi-gyrogroup and a bi-gyrovector space. a bi-gyrogroup is a gyrogroup each gyration of which is a pair of a left gyration and a right gyration. a bi-gyrovector space is constructed from a bi-gyrocommutative bi-gyrogroup that admits ...

Aims. Over the past few years a major effort has been put into the exploration of potential sites for the deployment of submillimetre astronomical facilities. Amongst the most important sites are Dome C and Dome A on the Antarctic Plateau, and the Chajnantor area in Chile. In this context, we report on measurements of the sky opacity at 200 μm over a period of three years at the French-Italian ...

Large span domes have always drawn architects’ and engineers’ interest as they provide easy method of roofing large areas with architectural beauty. Single layer Schwedler Dome composed Circular Hot Hollow Frame (CHHF) is investigated to understand the effects individual member removal behaviour stability single dome. The major issues structural system are related its instability phenomena wher...

41e Patients undergoing rhinoplasty occasionally require a decrease in nasal tip projection. Accomplishing such an objective requires a comprehensive working knowledge of nasal anatomy and function. Maneuvers executed to simply gain exposure during open or closed rhinoplasty can influence final position of the nasal tip. Failure to recognize and account for any alterations in tip support struct...

This work proposes a nodal-based evolutionary design optimization algorithm to frame structures whose edges are the Delaunay triangulation of homogeneously distributed nodes in domain. The remaining can freely sway domain except for loading and boundary nodes. As result, it extend space admissible solutions this problem reduce number variables. Then, sensitivity objective function, namely, sum ...