A stream of packets is monitored. The solid material is brought into a first crucible via a feeding source. A spring supported by the cover urges the pressure plate into the engaged position. The magnitude of a detectable X-ray fluorescence signal for at least one element can be used to determine whether a binding event between a binder and a receptor has occurred, and can provide information related to the extent of binding between the binder and receptor. The ranked video articles are displayed in a representation to the user, from which the user can play the video article either within the representation or independent of it. The front end of the wedge sleeve is mounted onto the second end section of the connector member.