In this paper, the heat transfer effect on the unsteady boundary layer flow of a Casson fluid past an infinite oscillating vertical plate with Newtonian heating is investigated. The governing equations are transformed to a systems of linear partial differential equations using appropriate non-dimensional variables. The resulting equations are solved analytically by using the Laplace transform m...

An artificial elastic finger for grasping an object, which we call an “artificial finger skin” is designed. Characteristics of the artificial finger skin are as follows: First, it has ridges at the surface and tactile sensors distributed underneath the ridges same as finger of human. Second, it has a curved surface in broad perspective. Third, it is made of an elastic silicone rubber so as to t...

An artificial elastic finger skin for robot fingers is developed for controlling grasp force when weight and frictional coefficient of the grasped object is unknown. The elastic finger skin has ridges at the surface to divide the stick/slip area. It also has a pair of tactile sensors embedded per one ridge same as finger of human. Surface of the whole finger is curved so that reaction force dis...

structure of the epidermis of those areas of skin subject to tylosis, and we suggest that both tissues may be responsive to the same functional requirement-namely, the need to provide resistance to mechanical friction. Human epidermis can be classified into "thick" and "thin" types.3 Thick skin is found most characteristically on the palms and soles, and relative to thin skin it has a thicker s...

The problems of exact state reconstruction and approximate state estimation based on wall information in a wall-bounded incompressible unsteady flow are addressed. It is shown that, if in an arbitrarily small neighborhood of time t precise measurements are made of the two components of wall skin friction and the wall pressure, all terms in the Taylor-series expansions of the unsteady flow state...

Using direct numerical simulations of turbulent channel flow, we present a new method for skin friction reduction by prevention of streamwise vortex formation near the wall. Based on recent evidence of streak instability-induced vortex generation, we develop a new technique for drag reduction, enabling large-scale flow forcing without requiring instantaneous flow information. As proof-of-princi...

This article proposes a technique to calculate the coefficient of friction for the fingertip- object interface. Twelve subjects (6 males and 6 females) participated in two experiments. During the first experiment (the imposed displacement method), a 3-D force sensor was moved horizontally while the subjects applied a specified normal force (4 N, 8 N, 12 N) on the surface of a sensor covered wit...

Skin of the newborn differs from that of an adult in several ways. It is more susceptible to trauma and infection and requires special care. Certain principles of skin care have to be emphasized to the mother or caregiver such as gentle cleansing, adequate hydration and moisturization of the skin, preventing friction and maceration in body folds, and protection from irritants and bright sunligh...

This article reports on the use of a shock tunnel to study the operation of scramjet powered configurations at sub-orbital velocities above 2 km/s. Thrust, as given by a net thrust equation, is used as a figure of merit throughout the study. After a short description of the shock tunnel used and its operating characteristics, experiments on the combustion release of heat in a constant area duct...