Abstract: A hydrocarbon-containing feed, e.g. naphtha, is converted in a treatment plant (1), in particular a refinery or olefin plant, into desired olefins, e.g. ethylene and propylene. At least part of the fractions comprising relatively long-chain olefins, in particular olefins having at least four carbon atoms, obtained from the treatment plant (1) is passed to an olefin conversion stage (12). In the olefin conversion stage (12), for example, a catalytic reactor, in particular a fixed-bed reactor, at least part of the relatively long-chain olefins is converted into relatively shorter-chain olefins. To increase the yield of desired olefins, the olefin conversion stage (12) is preceded by a paraffin/olefin separation stage (23) wherein the feed stream is separated into a paraffin stream, e.g., a stream comprising butane and pentane, and an olefin stream, e.g,. a stream comprising butene and pentene, e.g., by extractive distillation. The paraffins obtained are recirculated to the treatment plant (1), e.g.

Abstract: Permitting or prohibiting a drop is executed at the beginning of the drag-and-drop action initiated by the user, by mouse-clicking on the object to be dragged, for example. Thus, the drag-and-drop action is shown as a visual drop permission or prohibition in the relevant drop areas, such as a visual queue, for example, check mark, etc. In the preferred embodiment, and upon initiation of the action, the surface components display which areas, parts, elements or substructures can or cannot accept a given object or data element before a mouse pointer, arrow or cursor reaches or moves over the relevant areas, parts, elements or substructures.

Abstract: In a device (5) for producing a quartz glass crucible (2) a section (14, 15) of a wall (13) of a rotating quartz glass crucible (2) is heated by at least two electrode arrangements (7, 8) which are evenly spaced along the periphery of the quartz glass crucible (2) and create a first and a second electric arc. The use of a plurality of electrode arrangements (7, 8) allows a reduction of the cooling phase of the section (14, 15) i.e. the time until it reaches the next heating zone (11, 12), so that undesirably high temperature differentials in the wall (13) are prevented. At the same time the required heat output of each individual electrode arrangement (7, 8) can be reduced so that vaporization and the concurrent bubble formation is reduced. In addition to the higher levels of quality attainable hereby, the duration of the manufacturing process is also reduced.

Abstract: The mouse cursor is moved over the register of a register dialog once a drop-and-drag action has been initiated, then the register under the mouse cursor is automatically moved to the foreground after a variable time interval, and the contents can thus be seen. Process of making the item visible is initiated just by locating the mouse over the register of the concealed registered dialog. The invention can be extended to normal mouse movements (that is to say that other than drag drop.) Dropping an object on to a drop destination in a concealed register of a register dialog for drag and drop actions and drag and drop between the registers of a tabbed dialog or the pages of a workbook (such as the various tables in Excel, for example.

Abstract: An industrial automation computer display presents cumulative or sequential messages to the user through an unobtrusive and discreet navigator and with audio-visual feedback. The messages related to fault-causing events are stored, and the last message is displayed in a space-saving manner in the navigator. A complete list of messages appears when the user requests it through a user-activated icon, allowing navigation to, and assessment of, the messages. After selection of an entry and initiation of a “jump” to the fault location, the list disappears and the discreet navigator is once again reduced to the original message indicator, which can also be made to disappear altogether until the next significant event occurs. That is, the user sees the complete list in a pop-up window for only as long as she/he needs to, and thus considerably more working area is made available.