Friction is one of the key factors in manufacture ropes, and has an important influence on mechanical behavior many fiber assemblies. For this reason, understanding evaluation coefficients friction between fibers essential step development numerical rope models. This paper describes tests a modified, upscaled version ASTM (American Society for Testing Materials) standard yarn-on-yarn abrasion t...

Recent research on friction in robot joints and transmission systems has considered meshing friction a position-dependent friction component. However, in this paper we show experimental evidence that meshing friction depends highly on joint speed. We identify the meshing friction in the gearboxes of a robotic leg, and we propose a new mathematical model that considers the rate dependency of mes...

The theoretical basis for analyzing the effects of an allosteric modulator on the response to an agonist is described. The effects of an allosteric modulator on the concentration-response curve to an agonist can be attributed to changes in the observed dissociation constant and intrinsic efficacy of the agonist-receptor complex. Each of these two changes can be represented by a coefficient or f...

Abstract. The aim of this contribution is to present the current state of our research in the field of numerical simulation of dislocation motion in crystalline materials. The simulation is based on recent theory treating dislocation curves and dipolar loops interacting by means of forces of elastic nature and hindered by the lattice friction. The motion and interaction of a single parametrical...

1 Center for Nanotechnology in Drug Delivery, UNC Eshelman School of Pharmacy, University of North Carolina at Chapel Hill, Chapel Hill, NC, United States, 2 Curriculum in Genetics and Molecular Biology, University of North Carolina at Chapel Hill, Chapel Hill, NC, United States, 3 UNC Lineberger Comprehensive Cancer Center, University of North Carolina at Chapel Hill, Chapel Hill, NC, United S...

Regional changes in the flow velocity of Antarctic glaciers can affect ice sheet mass balance and formation surface crevasses. The anomaly a glacier be detected using Double-Differential Interferometric Synthetic Aperture Radar (DDInSAR) technique that removes constant displacement two Differential SAR (DInSAR) images at different times shows only temporally variable displacement. In this study...

Abstract After powder metallurgy and carbon/carbon brake materials, carbon-ceramic material (C/C-SiC) is a new generation of braking material. There are currently some batches materials whose friction performance could be better: slightly higher than the standard. SiC was introduced into C/C-SiC disc through Polymer Impregnation Pyrolysis (PIP), composition friction-wear C/C-SiC-SiCp were inves...

Friction occurs in all mechanical systems,e.g. bearings, transmissions, hydraulic and pneumatic cylinders, valves, brakes and wheels. Friction appears at the physical interface between two surfaces in contact. Lubricants such as grease or oil are often used but the there may also be a dry contact between the surfaces. Friction is strongly influenced by contaminations. There is a wide range of p...

In this paper, a SDOF system with nonlinear viscous friction under harmonic excitation is studied. A nonlinear viscous friction model is built as an exponential expansion of the relative slip velocity. According to the adaptive control theory, an adaptive controller for the friction compensation of the SDOF system with nonlinear viscous friction is put forward by using the model-based parameter...