Abstract: Disclosed are a method and an improvement to the existing conventional magnetic flux leakage inspection device that employ some fixed magnets that are fixed inside the magnet yoke and some movably adjustable magnets, allowing their dipole orientation to be adjusted between 0° and 180° relative to that of the fixed magnets. A lever and gear set connected to the adjustable magnets can be operated to achieve desired level of magnetic strength of the device, including turning off the whole magnetic field, by causing the fields of the fixed and adjustable magnets to cancel each other. The disclosed adjustable yoke can also be used in other NDT/NDI applications where providing an adjustable magnetic strength is desirable.

Abstract: An advertisement system and methods for video-on-demand (VOD) services. The invented system comprises means and steps of synchronizing and coordinating between advertisement play and VOD play so that the advertisement play will not be skipped by fast-forwarding of the VOD play to assure the viewing of advertisements by viewers.