Abstract: A deployable and inflatable/deflatable fendering apparatus capable of providing protection for watercrafts and docks. The apparatus has an inflatable cylindrical body, an outer collar body, and a water reservoir with an inflating and deflating means. The collar body circumferentially surrounds the cylindrical body, and is made of abrasion resistant materials and protects the cylindrical body from punctures, tearing and abuse. The collar body may be inflatable or filled with foam-like material. The reservoir comprises a one-way valve, a series of ballasts and is attached to the cylindrical body and is expandable to provide stabilization of the fendering apparatus. The fendering apparatus can be deflated for storage.

Abstract: A circuit and method for driving a magnetostriction oscillator which is used for generating a high output ultrasonic wave by using a pulse width modulation is provided. In the circuit, a controller outputs first and second variable digital signals in order to control a duty cycle of a magnetostriction oscillator. A pulse width modulating circuit generates a variable pulse width modulating signal based on the first and second variable digital signals from the controller. A driver drives the magnetostriction oscillator according to the variable pulse width modulating signal from the pulse width modulating circuit. According to the circuit, the system operates for a long time so that stability of equipment can be obtained. The circuit uses low voltage and low energy so that efficiency of the system is promoted.

Abstract: An elongate body of elastomeric material of substantially uniform width and thickness has support plates fixedly attached to opposite ends of the body of elastomeric material. The plates are oriented substantially parallel to each other and normal to the longitudinal axis of the body of elastomeric material. A rigid wedge member is mounted within and transversely of the body of elastomeric material between and in spaced relation to the plates. The wedge member forms a wedge angle in the body of elastomeric material for controlling the direction of buckling.