The description of the road and natural-climatic conditions for operation timber-carrying trains is given. main features logging roads, which are characterized by insufficient infrastructure, considered. analysis negative consequences movement along such roads in various natural climatic carried out. dependences change speed fuel consumption a train on nature longitudinal profile road, performa...

introduction: bleaching process can affect surface roughness of enamel, which is a vital factor in esthetic and resistance of tooth. the aim of this study was to compare surface roughness of enamel in teeth bleached using diode and neodymium-doped yttrium aluminium garnet (nd: yag) lasers with those bleached using conventional method. methods: in this study, 75 anterior human teeth from upper a...

one of the most important factors that affect tire friction is surface roughness, which determines the size of the real contact area, real pressure distribution on the contact interface, and scales of mechanical engagement between viscoelastic rubber and a rough substrate. the need to predict coefficient of friction (cof) for rubber on rough surfaces for applications such as traction of tires o...

different construction materials with different roughness used to make circular weirs highly affect surface roughness and, in turn, flow hydraulics passing over these structures.  in the present research, numerous experiments under different hydraulic conditions were performed on a physical model to study the effects of roughness on flow hydraulics over a circular weir. the flow hydraulics incl...

In an effor was begun on charac material that was use roughness correspon respectively. These v type of machined stru Linear Collider Collaboration Tech Notes Surface Preparation on RF Breakdown Performance in NLCTA Accelerating Structures R. E. Kirby, F. Le Pimpec, F. Marcelja, C. Pearson Stanford Linear Accelerator Center Stanford University Menlo Park, California t to locate the cause(s) of ...

Results of the study roughness and friction properties road surface urban streets influence on traffic safety are presented in this article. As a result study, an empirical dependence was obtained, reflecting relationship between speed load factor under different conditions; flow density street capacity also determined. The maximum permissible value coefficient for experimental is 0.4, 50 % obj...