A method and system for determining a ranking of web sites based on an aggregation of rankings of the web pages within the web sites is provided. The dynamic conversion circuit may be applied to a single phase or multiphase interleaved VRM of either isolated or non-isolated design configurations, and enhances power transfer from the input to the output of the DC-DC converter and tightly regulates the output voltage during harsh load current transients. The bottom frame is pivotally connected at a rear end to the lower members of the two side frames, so that a front end of the bottom frame may be raised or lowered and detachably connected to the curved front members of the side frames to set the bottom frame to a desired inclination. The end of the second tubular wall of the cartridge is folded inwards and upwards so as to form a holding surface that receives the axial protrusion and keeps it motionless.