A sensing method and circuit for a capacitive touch panel sense the capacitance variation of a lateral capacitor formed at the intersection of two traces of the capacitive touch panel, to distinguish a real point from a ghost point. A controlling apparatus determines a power supply mode of the Ethernet power sourcing equipment, and determines high-power Ethernet powered device and low-power Ethernet powered device among the Ethernet powered devices. Moreover, the gas spring comprises an expansion chamber for the liquid and a pressure regulating device, which is adapted to control the liquid transport between the cylinder and the expansion chamber in dependence of the temperature, thereby keeping the force characteristics of the gas spring substantially independent of the temperature. The hydrodynamic flow pressure of the ink supplied to each nozzle row is prevented from fluctuating. The attenuated intensities in each of the four scene-images are used to calculate the Stokes parameters for selected points in the scene for the selected wavelength. Thus, the method of the present invention enables BD-J to normally play the BD-J title in the Blue-ray Disc Read Only Memory and, at the same time, effectively improves the playing performance.