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After completion of annealing for bonding of the base wafer 1 and bond wafer 2, the bond wafer 2 is thinned to a first thickness suitable for ion implantation, and boron is ion-implanted to thereby form a high-boron-concentration layer 10. A second thinning step based on selective etching is then carried out while using the high-boron-concentration layer 10 as an etch stop layer. This is successful in providing a method of fabricating an SOI wafer which is suppressed both in intra-wafer uniformity of the firm thickness and in inter-wafer uniformity of the film thickness even when a required level for the thickness of the SOI layer is extremely small.

The invention relates to an inductive proximity sensor for embedding in a mild steel mounting plate, comprising an enclosure with a front wall of synthetic material forming a sensing face at a front end of the enclosure, an oscillator comprising a sensor coil with a core made of a material with a relative magnetic permeability larger than 1, typically a ferrite, which is arranged within the enclosure behind the front wall so that an open side of the core is directed towards the sensing face in order to direct the magnetic field of the coil towards a target in front of the sensing face, a hollow cylindrical metal member arranged perpendicular to the sensing face and surrounding the core, and a measuring circuit for measuring an attenuation of the oscillator due to eddy currents. The core is radially surrounded by a metal layer with a low electrical resistivity of less than 15 μΩ·cm and with a thickness of less than 40 μm, in order to improve the embeddability of the sensor. Alternatively, this thin metal layer may be omitted, if the electrical resistivity of the metal member is adjusted to a value in the range of 15 μΩ·cm-50 μΩ·cm.

A wireless LAN system uses an address that is used by another device than terminals connected to a wireless LAN, as a multicast destination address. An access point sets an address that is used by another device than terminals connected to a wireless LAN of its own, as a multicast destination address. The access point generates a unique multicast frame, which is to be discarded by an ordinary terminal, with the multicast destination address set as a destination address according to a standard frame format, and sends the generated unique multicast frame through a wireless link. A special terminal stores the multicast destination address in advance. The special terminal receives a frame from the access point as a unique multicast frame if the multicast destination address is set as a destination address of the frame.

An electromagnetic relay including an electromagnet block having a rod-shaped iron core, a coil wound around the rod-shaped iron core, and a spool interposed between the coil and iron core. A yoke having one end section extends to a section at a side of a magnet pole section of the iron core. An end section of the yoke is arranged so that the magnet pole section has a gap on a base side. A moving iron is pivotably supported by an elastic support of a hinge spring. The electromagnet block is magnetized wherein a section drawn in the moving iron is drawn to the magnet pole section and pivoted to drive a contact switching unit. The hinge spring includes an elastic contacting portion extending toward an opposite side to the elastic support. The moving iron is integrated with a card member that comes in contact with the elastic contacting portion.

The present invention is directed to a method of reducing the nicotine content of a tobacco plant to less than addictive levels. The method includes the step of administering to the tobacco plant an effective amount of a nicotine reducing agent sufficient to reduce the level of nicotine in the tobacco plant so that the resulting nicotine content in the plant is reduced to a level wherein a tobacco product produced from the plant will yield a non-addictive level of nicotine in the central nervous system blood plasma of the user. The present invention is further directed to tobacco plants prepared by the method.