All surfaces and interfaces between dissimilar materials are rough. The extent to which this roughness affects the reflection of elastic waves has been the subject of study for many decades. A recent book by Ogilvy [1] provides a comprehensive review and summary of this subject. The problem is of particular interest in ultrasonic nondestructive evaluation. For example, it has been shown that fo...

coeffcient of  friction  (cof)  for  rubber parts  is one of  the key parameters in their interaction with solid rough surfaces (micrometer to millimeter scales),  such  as  tire-road  interactions. cof  of  rubber  depends  on  viscoelastic properties of rubber, roughness characteristics of the counter-part surface, and process variables such as contact nominal pressure and sliding speed. due ...

A new locally sparse (i.e., zero on some subregions) estimator for coefficient functions in functional linear regression models is developed based on a novel functional regularization technique called “fSCAD”. The nice shrinkage property of fSCAD allows the proposed estimator to locate null subregions of coefficient functions without over shrinking non-zero values of coefficient functions. Addi...

− The constitutional diagnosis using human skins is classified to palpation in oriental medicines. From Sasang constitutional medicine which is one of oriental medicines, human could be divided by the properties of their skins such as texture, roughness, hardness and elasticity. Especially, the friction coefficient and roughness of skins have big discrimination ability in the classification of ...

We describe experiments that compared the perceived relative roughness of textured virtual walls synthesized with an accurately controlled haptic interface. Texture was modeled as a spatially modulated sinusoidal friction grating. The results indicate that both the modulation depth of the grating (A), and the coefficient of friction (μ) are strongly associated with the perceived roughness when ...

[1] We apply the Finite Volume Coastal Ocean Model to simulate the Hurricane Ike storm surge using two-dimensional (2-D) and three-dimensional (3-D) formulations. The high resolution, unstructured grid extends over the Gulf of Mexico with open boundaries in the Straits of Florida and the Yucatan Channel. With the same wind and pressure forcing, the bottom drag coefficients for the baseline 2-D ...

The scalar roughness length for temperature, z0h, is necessary to estimate the sensible flux from atmospheric surface layer similarity theory in conjunction with skin temperature measurements. A theoretical relationship for z0h as a function of the roughness Reynolds number z01 which was developed by Brutsaert [1975] for rough-bluff surfaces is often used to link infrared skin temperature measu...

The present investigation deals with the study and development of a surface roughness prediction model for the machining of unidirectional glass fiber reinforced plastics (UDGFRP) composite using Artificial Neural Network (ANN). The feed forward back propagation is used. Taguchi method (Orthogonal L16 array) is employed to carry out the experimental work. The process parameters selected for stu...

Heat transfer in rough circular cylinder microfins is studied and a new analytical model is developed. Assuming Gaussian isotropic surface roughness, it is shown that both cross-sectional and surface areas ofmicrofins increase by increasing roughness. Consequently, an enhancement is observed in the heat transfer rate and thermal performance of microfins. The effect of roughness is more profound...