In a portable electronic apparatus, control parts are concentrated in a small space, and they can be operated easily by one hand. The surface of the electrode can be microroughened. A jitter detector detects time difference jitter, which is jitter in a time difference between the internal and external synchronization signals. One or more slurry phase reactors may be built and positioned upstream from one or more fixed bed reactors of a pre-existing fixed bed system andor converted from one or more pre-existing fixed bed reactors. An outer surface of a rigidifying base layer is designed to form a spacer means in the form of a plate of dimensions substantially greater than the format of the module, over all or part thereof, to constitute after abutment of the modules andor edge jointing of the plate edges, a zone for receiving a sealant such as a binder, putty and like bonding. The system is characterized in that it comprises a conductor arrangement, which comprises a number of conductor components, that forms an electromagnetic field, as well as a transmitter associated with the object.