Abstract: A system and method for providing personalized electronic learning material in an educational infrastructure is described. In a method conducted at a student device associated with a student and having a software application resident therein, access to a portable document format (PDF) file is received from a computerized server. The PDF file contains learning material. Access to student-specific educator content is received from the computerized server. The content is specific to the student and access thereto is pushed to the student device from an educator device via the computerized server. The student-specific educator content is associated with the PDF file. The PDF file and student-specific educator content associated therewith are accessed and the student-specific educator content is superimposed onto the PDF file. The PDF file having the student-specific educator content superimposed thereon is output to the student.

Abstract: An educational infrastructure in which an educational institution has a real or virtual computerized server that is in operative communication with communications devices accessible to multiple students who are individually identifiable by way of identification data inputted from time to time by the individual students and wherein the computerized server is programmed to monitor individual student activity on the relevant communications device whilst the student utilizes electronic learning material by way of the communications device, and wherein the computerized server is further programmed to record data as to the nature and duration of student engagement with electronic learning material of different types.

Abstract: A seal assembly (10) includes a first seal element (12) defining a fist sealing surface (14); displacement means including at least one electromagnet (20) operatively coupled with the first seal element (12), the displacement means being operable to displace the first seal element (12) via the, or each, electromagnet (20); and a second seal element defining a second sealing surface (28) associated with the first sealing surface (14), the first and second seal elements providing a seal. The invention extends to a combination comprising a gas turbine and a seal assembly. The invention further extends to a method of controlling a spacial relationship between respective sealing surfaces of two seal elements.