Abstract: A method for enabling users to offer educational support in response to a designation of instructor identifier (ID) tags associated with network accessible learning documents. The method comprises selecting by a first user using a first client terminal a network accessible learning document, associating an instructor ID tag indicative of the first user with the network accessible learning document, instructing a presentation of the instructor ID tag in association with the presentation of the network accessible learning document to a second user accessing the network accessible learning document via a second client terminal, identifying a user selection designating the instructor ID tag and made by the second user, and establishing a tutorial session which is based on an interactive communication connection between the first user and the second user.

Abstract: A method for trapping of a plurality of charged particles in a charged particle trap. The trap includes first and second electrode mirrors having a common optical axis, the mirrors being arranged in alignment at two extremities thereof. The mirrors are capable, when voltage is applied thereto, of creating respective electric fields defined by key field parameters. The electric fields are configured to reflect charged particles causing their oscillation between the mirrors. The method includes introducing into the trap, along the optical axis, the plurality of charged particles as a beam having pre-determined key beam parameters. The method further includes choosing the key field parameters for at least one of the mirrors such as to induce bunching among charged particles in the beam.

Abstract: A method for trapping of a plurality of charged particles in a charged particle trap. The trap includes first and second electrode mirrors having a common optical axis, the mirrors being arranged in alignment at two extremities thereof. The mirrors are capable, when voltage is applied thereto, of creating respective electric fields defined by key field parameters. The electric fields are configured to reflect charged particles causing their oscillation between the mirrors. The method includes introducing into the trap, along the optical axis, the plurality of charged particles as a beam having pre-determined key beam parameters. The method further includes choosing the key field parameters for at least one of the mirrors such as to induce bunching among charged particles in the beam.

Abstract: There is provided a three-dimensional imaging system (2), including a first camera (6) and a second camera (8), both facing a field of view of two-dimensional images and a normally open, fast gating device (12) interposed between the second camera (8) and the field of view (14 and 26). The system further includes a frame grabber (10) connected to the first and the second camera, and a computer (14) for receiving signals representing, pixel by pixel, light intensities of an image during a predetermined period of time and signals representing same pixel by pixel of light intensities arriving at the second camera until the fast gating device (12) is closed, and for determining three-dimensional imaging signals therefrom to eventually be displayed. A method for producing three-dimensional imaging is also provided.