摘要:
In embodiments of the present invention improved capabilities are described for determining a multi-dimensional sound signature for a location within a hypothetical space, comparing the multi-dimensional sound signature to a known multi-dimensional sound signature, and modifying the hypothetical space such that the similarity between the multi-dimensional sound signature for the location within the modified hypothetical space and the known multi-dimensional sound signature is increased.
摘要:
The present invention relates to a device and corresponding method for ultrafast controlling of the magnetization of a magnetic element. A device (100) includes a surface acoustic wave generating means (102), a transport layer (104), which is typically functionally and partially structurally comprised in said SAW generating means (102), and at least one ferromagnetic element (106). A surface acoustic wave is generated and propagates in a transport layer (104) which typically consists of a piezo-electric material. Thus, strain is induced in the transport layer (104) and in the ferromagnetic element (106) in contact with this transport layer (104). Due to magneto elastic coupling this generates an effective magnetic field in the ferromagnetic element (106). If the surface acoustic wave has a frequency substantially close to the ferromagnetic resonance (FMR) frequency VFMR the ferromagnetic element (106) is absorbed well and the magnetisation state of the element can be controlled with this FMR frequency. The device can be used in an RF-magnetic resonator, a sensor and a camera. The corresponding method can be used for ultrafast reading-out and switching of magnetic components and in magnetic logic.
摘要:
Ein akustische Linsenanordnung mit mindestens einem Wandler zur Erzeugung und oder zum Empfang eines ebenen Schallwellenfeldes, mitteln zum Fokussieren des Schallwellenfeldes in einem Objektbereich und mindestens einem Medium zum verlustarmen Übertragen des Schallwellenfeldes zwischen dem Wandler, den Mitteln zum Fokusieren und dem Objektbereich zeichnet sich dadurch aus, daß dem Wandler (1) gegenüberliegend eine von dem Schallweltenfeld (8) beschallte Zylinderfläche (7) vorgesehen ist, deren Längsachse (6) gegenüber der Normalenrichtung auf dem Schallwellenfeld (8) so geneigt ist, daß in einer Stellung der Längsachse (6) normal zur Oberfläche (5) des Objektbereichs die dort auftreffenden Schallstrahlen einen kritischen Winkel Θ R mit der Normalen auf der Objektoberfläche bilden.
摘要:
Provision is made for spatially stabilizing standing capillary surface waves (62) in fixed and repeatable locations with respect to stationary external references. For spatially stabilizing such a wave on the free surface (23) of a volume (24) of liquid, the wave propagation characteristics of the free surface of the liquid are periodically varied in a spatially stable manner at a spatial frequency equal to the spatial frequency of the standing wave or a subharmonic thereof, thereby locking the crests (64) and troughs of the standing wave in predetermined spatial locations. A spatially periodic pattern of notches (82) in a wall (83) or base plate bounding the free surface of the liquid may be employed to physically modulate its wave propagation characteristics at a suitable spatial frequency. Alternatively freely propagating secondary capillary surface waves may be launched from spatially periodic sites along the free surface of the liquid to actively modulate its wave propagation characteristics at the desired spatial frequency.