Abstract: The disclosure relates to estimation of junction temperatures of transistors in a power electronics converter. Example embodiments include a method of estimating a junction temperature of a transistor in a power electronics converter configured to convert between first and second supply voltages, the method comprising: providing a gate switching signal to the transistor; measuring a rate of change of current through the converter during a switching period of the transistor; and outputting an estimated junction temperature of the transistor based on the measured rate of change of current, wherein the rate of change of current is measured while a gate voltage of the transistor is above a gate threshold voltage and a drain-source voltage across the transistor is above a predetermined fraction of the first or second supply voltage whereby the rate of change of current is measured in a linear region.

Abstract: An estimation of junction temperatures of transistors in power electronics converter.

Abstract: The invention solves the problems associated with existing authentication and cryptographic systems used by Voice over IP (VoIP) and Unified Communication (UC) applications by providing a mechanism to enable VoIP and Unified Communication applications running on mobile devices, smart phones and tablets, to utilize software interfaces provided by the invention to perform the critical functions needed to authenticate and secure a VoIP or UC session. The invention performs these functions in a secure processing environment provided by the mobile device. Depending on the device type, the secure processing environment will be provided by the Secure Element component of a Subscriber Identify Mobile (SIM), by the Open TrustZone implemented on ARM chips, or by firmware included in the device. In each case the invention will interface with the secure processing environment using a published API providing low level access functions.

Abstract: An apparatus is provided for inspecting holes in components. The apparatus includes a telecentric lens system positionable at a near end of a hole with an optical axis of the lens system aligned with the axis of the hole to image the interior of the hole. The apparatus further includes an illumination system for illuminating the interior of the hole. The apparatus further includes a camera arranged to receive an image of the illuminated interior of the hole from the telecentric lens system. The illumination system includes a light source for producing a beam of parallel light, and optics for directing the produced beam through the telecentric lens system along the optical axis thereof, and through the hole. The beam reaches the far end of the hole, and is reflected from a surface located at or adjacent the far end of the hole to illuminate the interior of the hole.

Abstract: An apparatus is provided for inspecting holes in components. The apparatus includes a telecentric lens system positionable at a near end of a hole with an optical axis of the lens system aligned with the axis of the hole to image the interior of the hole. The apparatus further includes an illumination system for illuminating the interior of the hole. The apparatus further includes a camera arranged to receive an image of the illuminated interior of the hole from the telecentric lens system. The illumination system includes a light source for producing a beam of parallel light, and optics for directing the produced beam through the telecentric lens system along the optical axis thereof, and through the hole. The beam reaches the far end of the hole, and is reflected from a surface located at or adjacent the far end of the hole to illuminate the interior of the hole.

Abstract: This invention relates to 6-(hydroxyalkylcarbonyl) benzopyrans and their use as anticonvulsants.