Abstract: A microwave oven may perform an induction heating mode, dielectric heating mode, and induction/dielectric switch heating mode. The invention is adapted to a microwave oven, in which an induction coil is mounted on the outer bottom wall of a heating chamber, and a heat insulation member is mounted on the induction coil. The microwave oven comprises an induction heating section including an induction coil, a dielectric heating section including a magnetron, a power supply section for generating high frequency power by switching D.C. power obtained by rectifying commercial A.C. power, the power supply section including a power transistor for switching the D.C.

Abstract: An apparatus includes (a) a device which is capable of selectively generating heat in electrically-conductive material without substantially generating heat in non-electrically-conductive material, (b) a device capable of heating non-electrically-conductive material, and (c) an insulating shield between the two devices to help focus the energy generated by at least one of the devices.

Abstract: An oven (1800) for use in conjunction with a dynamic thermal-mechanical testing system that exhibits both self-resistive and self-inductive heating whenever a sufficiently large alternating (AC) electrical current is passed through the oven. In one embodiment, the oven is fabricated from a material which undergoes self-resistive heating to radiantly heat an internal volume of the oven. The oven also includes appropriately shaped heating sections (1830), which undergoes self-resistive and self-inductive heating to compensate for heat losses into a support for the oven.

Abstract: The present invention provides an electric joining method of a body to be jointed including the butted portion of at least between electroconductive ceramics to be jointed or between an electroconductive ceramics and a metal to be jointed, whereby the body to be jointed is electrically jointed while the thermal stress generated at the ceramics materials to be jointed is eased. In the electric joining method according to the present invention, at least a pair of electrodes are brought to butt against the materials to be jointed holding at least one or more butted portions therebetween, with a joining agent interposed at the butted portions. Moreover, there provided are a first heating means for heating the materials to be jointed between the electrodes by Joule heat through impression of a voltage between the electrodes and, a second heating means for heating a part of said materials to be jointed and its vicinity where a large temperature gradient is formed only by the first heating means.