Lateral velocity has very backbone position in the railway vehicle wheelset dynamics as it usually becomes cause of derailment by sliding due to insufficient adhesion ratio. This impropriate balance is pretext owing to contamination and weather procures the disturbances. This perturbation makes hindrances in proper running of wheelset on track. To analyze the noise, Kalman filter is used based ...

The effect of C60 molecular rotation on the nanotribological properties of C60 single crystal surfaces has been studied by atomic/frictional force microscopy. The orientational order-disorder phase transition, in which the high temperature C60 free rotation is reduced to a low temperature hindered rotation, is shown to give rise to an abrupt change in friction and adhesion. This change in frict...

An effort is made to evaluate the formulation of seismic active earth pressure behind a nonvertical retaining wall supporting c-Ф backfill. The formulation is prepared to get a single critical wedge surface for simultaneous action of weight, surcharge, cohesion and adhesion. The success of any retaining structure involves the awareness of seismic active earth pressure. The effect of various par...

Nano-scratch and nano-indentation were used to determine hardness, elastic modulus, adhesion, friction and wear resistance of chromium oxide coatings in air and in water. The friction coefficient is higher in water, compared to air, and it increases with the applied normal load, although there are no obvious differences in hardness and elastic modulus in air vs. water. A higher normal load incr...

A linear electrostatic stepper motor has been designed and fabricated in a single mask surface micromachining process.. It consists of two drive units that alternately generate a step to move the shuttle. The friction and adhesion in the clamps has been measured. A friction coefficient of 0.8 * 0.3 have been found. The adhesion in the clamp is just low enough to release the clamping shoe. Stepp...

Graded DLC based coatings and multilayers for wear resistance applications have been produced using a novel hybrid unbalanced magnetron sputtering1 low pressure CVD system. The main features of this highly flexible and scalable process are discussed. These films have been characterised using a variety of techniques including SEM, microhardness, adhesion, wear rate and lifetime tests. For exampl...

related markers are early and responsive indicators of changes in vitamin B 12 status. Some indication of the size of what constitutes a significant change in serial holo-TC values is provided by the calculation of RCVs. The present study indicates that holo-TC values would need to change by nearly 50% for an investigator to be 95% certain that one value was significantly different from a previ...