Several different working principles exist to drive a valveless pump. An efficient pump may be designed by placing a flapping foil into a channel filled with fluid. In the case of inviscid flow, the pressure difference along the channel is equivalent to the thrust force acting on the propulsor. The focus in this talk is to find foil movements of highest propulsive efficiency for a given thrust....

The impact of knowledge management systems on organizational performance continues to be an under researched area. What complicates the area of knowledge management is the lack of understanding about the concept of knowledge. This paper focuses on knowledge to tease out the differences between information and knowledge as used by information systems. The thrust of the paper is to develop a mode...

introduction knowledge is continuously being produced in the process of formulating and implementing rural development projects. the capital is available without any cost, but it is neglected. knowledge has been distributed along the extensive network through the country. if knowledge management is recorded and exploited, it could lead to dramatic changes as a result of the butterfly approach. ...

The surface swimming of muskrats (Ondatra zibethicus Linnaeus) was studied by forcing individual animals to swim against a constant water current, of velocity ranging from 0.2 to 0.75 m s-1, in a recirculating water channel. Lateral and ventral views of the swimming muskrats were filmed simultaneously for analysis of thrust by the propulsive appendages. Drag measurements and flow visualization ...

The problem of forming a rotating ring-shaped tethered system consisting three nanosatellites is considered. To analyze the dynamics tether system, mathematical model developed in orbital coordinate using Lagrange method. Using sliding mode control method, two programs for deployment tethers are proposed, which tensions and thrust forces created by low-thrust engines used as controls. In first ...

The classic first-order thrust approximation for solar sails is analytically extended to include the effects of secondary reflections and generalized in a practical Finite Element Model (FEM) based routine. Examination and inclusion of secondary reflection forces are shown to grow increasingly non-trivial as the deformation becomes more extreme. The approach taken herein does not address the “b...

An undulatory pattern of body bending in which waves pass along the body from head to tail is a major mechanism of creating thrust in many fish species during steady locomotion. Analyses of live fish swimming have provided the foundation of our current understanding of undulatory locomotion, but our inability to experimentally manipulate key variables such as body length, flexural stiffness and...

This paper describes an approach for controlling the attitude of statically unsable thrust-levitated vehicles in hover or slow translation. The large thrust vector that characterizes such vehicles can be modulated to provide control forces and moments to the airframe, but such modulation is accompanied by significant unsteady flow effects. These effects are difficult to model, and can compromis...