Abstract: The present disclosure provides an orthodontic article including the reaction product of the polymerizable composition. Further, the present disclosure provides polymerizable compositions and methods of making an orthodontic article. The method includes obtaining a polymerizable composition and selectively curing the polymerizable composition to form an orthodontic article. Further, methods are provided, including receiving, by a manufacturing device having one or more processors, a digital object comprising data specifying an orthodontic article; and generating, with the manufacturing device by an additive manufacturing process, the orthodontic article based on the digital object. A system is also provided, including a display that displays a 3D model of an orthodontic article; and one or more processors that, in response to the 3D model selected by a user, cause a 3D printer to create a physical object of an orthodontic article.

Abstract: A method and system for secure transfer of electronic information. The method and system allow secure transfer of electronic information, such as electronic mail (e-mail) using digital certificates.

Abstract: A computerized audio or video signal control system controlled by an announcer and having a display of the available signal sources and scheduled events which can be activated, mixed, faded and cued by the announcer in the scheduled order or in an order the announcer desires. The control system provides the correlation between the displayed source or event name, the devices necessary to air the source or event and the routing necessary to air the event or source and then activates the proper devices to perform the task. The control system additionally logs the events actually activated in order.

Abstract: A computerized audio or video signal control system controlled by an announcer and having a display of the available signal sources and scheduled events which can be activated, mixed, faded and cued by the announcer in the scheduled order or in an order the announcer desires. The control system provides the correlation between the displayed source or event name, the devices necessary to air the source or event and the routing necessary to air the event or source and then activates the proper devices to perform the task. The control system additionally logs the events actually activated in order.

Abstract: A fluidized bed heat exchanger in which a grid plate is supported in a housing for receiving a bed of particulate material, at least a portion of which is combustible. At least one perforated support pier projects from the surface of the grid plate and air is passed through the grid plate, the support pier and the material to fluidize the material. One or more heat exchange tubes extend within the housing and are supported by the support pier so that the air passing through the pier also passes over the tubes. Each tube extends in a serpentine relation to form a plurality of spaced parallel sections and a support structure is provided for supporting the sections relative to each other.