A method that includes implantation of dopants while a III-nitride body is being grown on a substrate, and an apparatus for the practice of the method. The magnetomotive forces are counteracted by magnetomotive forces induced by a compensating current. The brake resistors are electrically connected in a star configuration. In a second arrangement the acoustic signature of the seeds is determined and used to enhance the imaging of the seeds using a correlation function. The security server may determine a similarity score indicating how similar the request are to the behavioral profile and to requests commonly received from the entity. The short inking unit includes a changeable machine glazing cylinder.