longevity of osseointegrated implants are intensely influenced by biomechanical factors. control of these factors prevents mechanical complications, which include fracture of screws, components, or materials veneering the framework. in this study, the impact of length and threads pitch of dental implants on the stress distribution and maximum von mises stress in implant-abutment complex and jaw...

We describe in this paper two on-line algorithms for covering planar areas by a square-shaped tool attached to a mobile robot. Let D be the tool size. The algorithms, called Spanning Tree Covering (STC) algorithms, incrementally subdivide the planar area into a grid of D-size cells, while following a spanning tree of a grid graph whose nodes are 2D-size cells. The two STC algorithms cover gener...

To enhance the local buckling resistance of thin-walled steel pipes and their fire corrosion resistance, a new spirally stiffened square concrete-filled tubular laminated composite member with transverse ribs is proposed. Through four forms combined members for eccentric pressure testing, it was found that: ordinary pipe concrete drum more severe; spiral ribs, limited between stiffening ribs; d...

Autonomous underwater gliders (AUG) are a class of vehicles that move using buoyancy engine and forces from wings. Gliders execute turning motion with the help rudder or an internal roll control mechanism trajectory turn is spiral. This paper analyses sensitivity characteristics spiral manoeuvre on hydrodynamic coefficients glider. Based dynamics model gliding fish whose enabled by rudder, effe...

We have investigated the pitch angle ( $$\psi$$ ) of spiral arms galaxies in Hubble Space Telescope (HST) COSMOS field. The sample consists 102 face-on with a two-armed pattern at mean redshift $$\langle z\rangle\approx 0.5$$ . typical values distant are shown to be close those for nearby galaxies. Within one galaxy scatter different is, on average, half angle. In $$z$$ range from 1 0 we found ...

We develop a theory of first passage processes in stochastic nonequilibrium systems of birth-death type using two closely related epidemiological models as examples. Our method employs the probability generating function technique in conjunction with the eikonal approximation. In this way the problem is reduced to finding the optimal path to extinction: a heteroclinic trajectory of an effective...