A ball valve includes a valve housing 10 and a ball 20. One or more molecular connections of the molecular conducting connections can be strengthened or weakened according to an application of an electric field across said connection gap. The described system is capable of reducing motion artifacts in tomographic images computed from data acquired at a plurality of different cardiac cycle phases. The Web Services push gateway includes a push router coupled to the Web Services endpoint to receive the push messages, and to forward the push messages to an elected one of the mobile push bearers, from where is it ultimately delivered to a recipient mobile terminal employing a mobile push technology corresponding to the elected mobile push bearer. The mixed tungstentungsten carbide layer is a thin, low resistivity film with excellent adhesion and a good base for subsequent tungsten plug or line formation. , a first Wi-Fi beacon, which is propagating timing information about an external timing signal from a device which directly received the external timing signal.