Temperature Sensing Characteristics and Long Term Stability of Power LEDs Used for Voltage vs. Junction Temperature Measurements and Related Procedure

the effects of keyword and context methods on pronunciation and receptive/ productive vocabulary of low-intermediate iranian efl learners: short-term and long-term memory in focus

از گذشته تا کنون، تحقیقات بسیاری صورت گرفته است که همگی به گونه ای بر مثمر ثمر بودن استفاده از استراتژی های یادگیری لغت در یک زبان بیگانه اذعان داشته اند. این تحقیق به بررسی تاثیر دو روش مختلف آموزش واژگان انگلیسی (کلیدی و بافتی) بر تلفظ و دانش لغوی فراگیران ایرانی زیر متوسط زبان انگلیسی و بر ماندگاری آن در حافظه می پردازد. به این منظور، تعداد شصت نفر از زبان آموزان ایرانی هشت تا چهارده ساله با...

Methods for estimating junction temperature of AC LEDs

Light-emitting diodes operating on alternating current (AC) are gaining popularity in lighting applications. The junction temperature of an LED significantly influences performance. Although there are many proven methods for estimating the junction temperature of direct current (DC) LEDs, only a few methods have been proposed for AC LEDs. Two different methods were investigated and analyzed for...

A Nonlinear Voltage Stability Index based on Vector Analysis Method and Measurements of Active and Reactive Powers of Power System

This paper proposes a new voltage stability assessment method based on vector analysis method. This index extraction process relies on measurements of active and reactive powers from connected buses to the generator buses. Therefore, a limit for beginning of voltage collapse is determined based on the maximum power transfer theory. On the other hand, when the system requires load shedding, a ne...

Temperature Variable Supply Voltage for Power Reduction

The scaling trend of MOSFETs requires the supply and the threshold voltages to be reduced in future generations. Although the supply voltage is reduced, the total power dissipation and the static power of the chip are increased. Power dissipation is one of the limiting factors in achieving the highest performance of a chip. Therefore, new power reduction techniques are required. In this paper a...

Thermal effects and junction temperature evaluation of Power MOSFETs