A light emitting device in accordance with an embodiment of the present invention includes a first semiconductor layer of a first conductivity type having a first surface, and an active region formed overlying the first semiconductor layer. A second support for a follower member, typically a rocker arm, is arranged on a further end of the tappet pushrod. In exemplary embodiments, when the manipulation of a first surface or set of surfaces causes interference with a second surface or set of surfaces, the topologies of the surfaces are modified to account for the interference. The integrated value is compared with a threshold value to indicate whether the intermittency represents quiet laminar flow or noisy turbulent flow. One end of the pivot bearing shaft is mounted to the base of the disc drive, and the other end is secured to the cover of the disc drive in such a manner that the resonance characteristics of the pivot bearing assembly is improved in both the axial and radial direction of the pivot bearing shaft. Various examples relate to systems and methods for information retrieval, specifically those used for search engines.