Abstract This paper presents a heuristic friction compensation approach for handling the rolling friction behaviors of ball-screw-driven stages in the zero-velocity crossing regions including non-velocity-reversal motion. The rolling friction behaves in a nonlinear way, and would significantly deteriorate the control performance. Since the alteration of elastic energy in mechanical components o...

In this paper we assume determination of pseudo-viscosity coefficients of visco-elastic non-Newtonian fluid flow directly near the cooperating micro-bearing surface. We show the constitutive stress-strain dependencies of nonNewtonian visco-elastic media with regard to the content of addition of nano-particles. The greater content of nano-particles and influences of superficial layer of cooperat...

Microtubules are filamentous protein biopolymers found in eukaryotic cells. They form networks that guide active intracellular transport and support the overall cell structure. Microtubules are very rigid polymers, with persistence lengths as large as a millimeter. As such, they constitute an example of rodlike polymers, whose mechanical and rheological properties are as yet poorly understood. ...

When strips of activated airway smooth muscle are stretched cyclically, they exhibit force-length loops that vary substantially in both position and shape with the amplitude and frequency of the stretch. This behavior has recently been ascribed to a dynamic interaction between the imposed stretch and the number of actin-myosin interactions in the muscle. However, it is well known that the passi...

In three previous papers5,6,7),functional properties of spindle,leaf-like and tendon receptors in the frog sartorius muscle have been compared with each other during contractions or passive stretch of the muscle.It has been demonstrated that those properties were not only dependent upon the excitability of their sensory nerve endings,but also largely upon the visco-elastic properties of the und...

Commonly used polymer-based scaffolds often lack visco-elastic properties to serve as a replacement for cartilage tissue. This study explores the effect of reinforcement of silk matrix with chitosan microparticles to create a visco-elastic matrix that could support the redifferentiation of expanded chondrocytes. Goat chondrocytes produced collagen type II and glycosaminoglycan (GAG)-enriched ma...