Abstract:
First and second electrically conductive rods are provided inside a shielded electromagnetic test chamber. These rods are energized to radiate electromagnetic energy inside the chamber. The rods are mounted inside the chamber at right angles to one another, the first rod is movable through the interior volume in a first direction perpendicular to its long axis, and the second rod is movable through the chamber in a second direction perpendicular both to its own long axis and to the first rod's direction of motion. Energy is supplied to the two rods in a way that enhances the uniformity of the electromagnetic field applied to a working volume inside the chamber as the two rods move through the chamber.
Abstract:
The invention can be used in a micropump for dispensing a pharmaceutical liquid, in an ink jet printer or similar devices, or in other applications for controlled pumping of a liquid through an opening in a barrier wall. A pair of electrodes is in electrical contact with a fluid confined behind a containing wall. Each electrode is connected to a source of different electrical potential. When current is conducted through the fluid between the electrodes, resistance heating in the fluid causes local boiling and thus the formation and expansion of a bubble within the fluid. The electrodes are disposed on either side of an opening in the wall, so that the bubble is formed on one side of the wall in close proximity to the opening. Fluid behavior is such that a fluid jet is formed when the bubble collapses in close proximity to the wall. This jet impacts the bubble in a direction toward the wall. The jet then penetrates the bubble to impact against the wall and to urge a quantity of the fluid through the wall opening.
Abstract:
The invention relates to an IC chip-planning system and method to provide automatic creation and optimisation of chip-level design plan alternatives that can meet user-specific target chip area/design density, chip shape/aspect ratio, delay/timing closure, and/or congestion/routability objectives at each level of the designnullarchitectural, RTL, gate, structural and physical levels. By combining global searching and local searching, a multi-objective optimisation process and a single-objective optimisation process, the invention can greatly reduce searching and optimisation time. Flexible system structure allows for generation of the optimised chip-planning solutions via an open optimisation train, a small optimisation loop, and/or a large optimisation loop. With a function module to extract the topological relationship between blocks or gene structure from existing solutions whether from previous designs or manual designs, the invention may also successfully combine human experience and/or work with other EDA tools. A parallel system structure with redundancy elimination is preferably employed to attain high performance in the chip-planning. The invention has the potential to produce near optimal chip-planning solutions to meet the requirements for system-on-chip IC designs having more than 100 million gates and 1 GHz frequency.
Abstract:
A foldable obstacle system is provided on a hydraulic lifting body to alleviate cloud cavitation and so to reduce noise and surface erosion that might otherwise result from unsteady sheet cavitation and a re-entrant jet produced thereby. The system includes one or more foldable obstacle devices or plates, each of which is movable between a closed position at the surface of the body and an open position away from the body. When a re-entrant jet occurs, the jet acts to lift the plates and rotate them into the open position in which they block the re-entrant jet so as to reduce or prevent cloud cavitation. When cavitation does not occur, the normal fluid flow over the body acts to close and keep closed the obstacle devices or plates so that they do not interfere with the normal fluid flow.
Abstract:
A valveless micropump includes a hollow pump chamber having a driving element coupled thereto, an inlet channel coupled to the hollow pump chamber, and an outlet channel coupled to the hollow pump chamber. The inlet channel, the hollow pump chamber, and the outlet channel define a fluid flow path through the inlet channel, the hollow pump chamber, and the outlet channel. At least one direction-sensitive element disposed in the flow path within one of the inlet and outlet channels and comprising a direction-sensitive element, is installed at an angle which produces a drag ratio greater than unity on fluid in the flow path. The driving element may comprise an electrostatic/piezoelectric member. Various embodiments of the valveless pump include one or more of the airfoil elements mounted in one, the other or both of the inlet and outlet channels, including embodiments in which one or more cascades of the airfoil elements are mounted in the inlet channel and the outlet channel.
Abstract:
The invention can be used in a micropump for dispensing a pharmaceutical liquid, in an ink jet printer or similar devices, or in other applications for controlled pumping of a liquid through an opening in a barrier wall. A pair of electrodes is in electrical contact with a fluid confined behind a containing wall. Each electrode is connected to a source of different electrical potential. When current is conducted through the fluid between the electrodes, resistance heating in the fluid causes local boiling and thus the formation and expansion of a bubble within the fluid. The electrodes are disposed on either side of an opening in the wall, so that the bubble is formed on one side of the wall in close proximity to the opening. Fluid behavior is such that a fluid jet is formed when the bubble collapses in close proximity to the wall. This jet impacts the bubble in a direction toward the wall. The jet then penetrates the bubble to impact against the wall and to urge a quantity of the fluid through the wall opening.
Abstract:
This invention relates to an electrostatically operated, normally closed micromachined flow-through microvalve device. The device comprises a stationary valve plate layer and a movable valve plate layer, the latter including an electrode plate such that it is deflectable by electrostatic forces under an applied voltage, and having a plurality of movable valve elements, each valve element moving with a degree of independence from the remaining valve elements. Application of a voltage results in deflection of the movable valve elements, the order of deflection depending on the relative magnitude of the electrostatic force experienced by the respective associated portion of the movable valve plate layer. This can be prescribed by the geometry of the device, and a preferred example provides a different separation between different portions of the movable valve plate layer and a further electrode plate in a device base plate layer. The invention minimizes the voltage required to open a normally closed valve in a high-pressure fluid environment, whilst ensuring relatively high flow rates through the microvalve once opened.