Wide energy bandgap and high saturation velocity of GaN have played a pivotal role in increasing the output power density ( P out ) of a radio frequency (RF) transistor, allowing for an increased radar and communicati...
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ISBN:
(数字)9798350373738
ISBN:
(纸本)9798350373745
Wide energy bandgap and high saturation velocity of GaN have played a pivotal role in increasing the output power density ( P out ) of a radio frequency (RF) transistor, allowing for an increased radar and communication system range. A further improvement in output power densities of GaN HEMTs is currently thermally limited due to the waste heat generated during the device operation in the channel layer. Therefore, to realize reliable and sustained operation at high P out , thermal management in GaN HEMTs must be improved. We present AlN/GaN/AlN HEMTs, where an AlN buffer layer is homoepitaxially grown on bulk AlN substrates. In this heterostructure, AlN simultaneously offers an ultra-wide energy bandgap (~6.1 eV) and high thermal conductivity (340 W/m·K) [1] ; the thermal advantage of an AlN buffer layer in HEMTs grown on SiC substrates has been recently confirmed by Soctera [2] . AlN homoepitaxy employed in our heterostructure further improves the thermal performance by potentially eliminating the thermal boundary resistance at the growth interface [3] . To this end, we report the on-current and breakdown behavior of HEMTs grown on Al-polar bulk AlN for the first time after the dramatically improved AlN homoepitaxy by MBE [4] .
This research is to study the electric muscle stimulation system and hot compress. As well as focusing on building tools for applications in rehabilitation medicine and physical therapy. The neuromuscular system is an...
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Dengue Hemorrhagic Fever is an acute viral infectious disease caused by the dengue virus. Transmitted through the bite of Aedes Mosquitoes and divided into 4 severity. Severity 1 and 2 are characterized by a decrease ...
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The phenomenon of urbanization in Indonesia is inevitable. The new residential and economic centers in suburban areas is also a problem in city development. The gradual planning and development of smart cities in a li...
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The exploration of hybrid composites holds great promise in the pursuit of synergistic energy-harvesting solutions, providing an efficient approach to tap into multiple energy sources. One striking example is the BTO ...
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Sleep is the natural state of relaxation for human being. Sleep quality is an essential yet frequently neglected aspect of sleep in general. Sleep quality is essential because it allows the body to rest...
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Sleep is the natural state of relaxation for human being. Sleep quality is an essential yet frequently neglected aspect of sleep in general. Sleep quality is essential because it allows the body to restore itself and prepare for the next day. The standard method for evaluating sleep quality was subjective evaluation. Actigraphy devices, which can measure the sleep cycle, are now widely available. This study developed a method using Fuzzy Logic and an actigraphy device to measure and classify sleep quality. The fuzzy logic method was developed in several stages, which are determining the sleep quality measurement parameters, constructing the fuzzy set for each input variable, and developing the fuzzy rules. To evaluate the proposed fuzzy model, five individuals were invited to participate in the experiment and required to complete the PSQI subjective sleep questionnaire. The evaluation result shows that our proposed Fuzzy model achieves lower error compared to the existing method.
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