Rolling friction has been explained in terms of crack propagation through an adhesive joint. The contact between a smooth cylinder and flat has been regarded as an adhesive junction bounded by two cracks moving in the same direction at the same speed, one crack continually opening and one closing. Propagation of these cracks requires a force which is calculated from crack theory and shown to be...

Sound working of transmitting power is very essential. For immaculate working of the machines, bearings play an important and critical role. Standard monitoring methods of performance evaluation of rolling element bearings with high degree of reliability are yet to be explored. Authors have proposed rolling element bearing test rig for the same [3]. The formulation requires essentially the elec...

Selectin-mediated tethering and rolling initiates the multi-step process of leukocyte extravasation which is crucial for the formation of an inflammatory infiltrate. We studied the impact of platelets on this process in the skin. Using intravital microscopy, we analyzed platelet interactions with cutaneous post-capillary venules of mouse ears and observed an increase in platelet rolling if plat...

This paper discusses the mechanics of a rigid rimless spoked wheel, or regular polygon, ‘rolling’ downhill. By rolling, we mean motions in which the wheel pivots on one ‘support’ spoke until another spoke collides with the ground, followed by transfer of support to that spoke, and so on. We carry out three-dimensional numerical and analytical stability studies of steady motions of this system. ...

Damping capacity of hypo-eutectic Zn-Al alloys as a function of rolling ratio is investigated. Effect of heat treatment after cold rolling on the damping capacity is discussed. Damping tests were carried out using the method of the free decay of vibrations in bending oscillation. With an increase in rolling reduction, the damping capacity was increased. As the results of tensile and hardness te...

Measurement of the reversible hydrogen storage capacity of milligram Ti–6Al–4V alloy samples with temperature programmed desorption and volumetric techniques Jeff L. Blackburn a,∗, Philip A. Parilla a, Thomas Gennett b, Katherine E. Hurst c, Anne C. Dillon a, Michael J. Heben a a National Renewable Energy Laboratory, 1617 Cole Blvd, Golden, CO 80401, USA b Chemistry Department, Rochester Instit...

Let p ≥ 7, q = p. Kq(a) = ∑ x∈Fpm ζ m 1 (x m−2+ax) is the Kloosterman sum of a on Fpm , where ζ = e 2π √ −1 p . The value 1− 2 ζ+ζ−1 of Kq(a) and its conjugate have close relationship with a class of binomial function with Dillon exponent. This paper first presents some necessary conditions for a such that Kq(a) = 1− 2 ζ+ζ−1 . Further, we prove that if p = 11, for any a, Kq(a) 6= 1− 2 ζ+ζ−1 . A...

Experiments in which two specifically interacting protein molecules are dissociated by external force have yielded new insights into mechanisms involved in cell adhesion, leukocyte rolling, regulation of integrin activity, antigen-antibody interactions and other protein-mediated reactions contingent upon molecular recognition. Another important aspect of force-induced protein-protein unbinding ...

A new type of spherical robot, called KisBot, is presented that includes arms and two types of driving mode: rolling and wheeling. In the rolling mode, the robot uses its arms as pendulums and works like a pendulum-driven robot, while in the wheeling mode, it extends its arms to the ground and works like a one-wheel car. The basic design idea of KisBot is introduced and a prototype is implement...

Numerical simulation of the deformation process during flat rolling of multifilament HTS tapes has been investigated using a commercial FEM program, ELFEN. The numerical models were built up in 2D and 3D using a DruckerPragerKap model for the powder. Three different roll diameters (024 mm, 0 8 5 mm and 0126 mm) have been investigated. It is found that it is possible to perform numerical simulat...