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Wireless power transmission (WPT) is an emerging technology that is gaining increased visibility in recent years. Efficient WPT circuits, systems and strategies can address a large group of applications spanning from batteryless systems, battery-free sensors, passive RF identification, near-field communications, and many others. WPT is a fundamental enabling technology of the Internet of Things concept,...
Breakdown threshold voltage of an electrode less toroidal discharge has been studied using H- type solenoid coil excited by a 13.56 MHz radio frequency power in absence and in presence of a pre ionizing condition with different pressures, aspect ratio and axial magnetic field for dry air, molecular and rare gases. The breakdown threshold depends on various filling parameters, Pre-ionising condition,...
The advantages of the open vertical-field magnetic resonance-guided focused ultrasound surgery (MRgFUS) are attractive. The inverse technique using the bi-boundary conditions is proposed to design a uterine-oriented intra-operative RF coil with an ultrasound aperture for the MRgFUS system. In this study, the expected magnetic field of the RF coil is set to completely overlap the target organ. The...
One kind of running auxiliary trainer that measures stride length and frequency is studied, which consists of racetrack reader and portable RF card. TI's MSP430 SCM is adopted as RF card that saves identity information and measurement of strides is realized though mercury switch. Reader of high-power H bridge diver makes long distance and high reliability information transmission come true. Results...
One kind of running auxiliary trainer that measures stride length and frequency is studied, which consists of racetrack reader and portable RF card. TI's MSP430 SCM is adopted as RF card that saves identity information and measurement of strides is realized though mercury switch. Reader of high-power H bridge diver makes long distance and high reliability information transmission come true. Results...
Radiofrequency (RF) coils for magnetic resonance imaging (MRI) and spectroscopy (MRS) have been developed for resonance at 8.3 MHz, and 200 MHz. The coils work in any direction in the main static magnetic field of MRI machines. Therefore, the coil has at least two loops orthogonal to each other. At least one loop of the coil generates magnetic flux which has a perpendicular component to the main static...
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