Results 61 to 70 of about 37,508 (305)
Characterization of the semiconductor optical amplifier for amplification and photonic switching employing the segmentation model [PDF]
, 2008 This paper characterizes the gain and the carrier density responses of a semiconductor optical amplifier (SOA). In order to achieve the switching functions in SOA-based optical switches, such as Symmetric Mach-Zehnder (SMZ), the effect of the input ...
Ghassemlooy, Zabih +11 more
core +1 more source
Variable-Frequency Pulse Width Modulation Circuits for Resonant Wireless Power Transfer
Energies, 2021 In this paper, we develop a variable-frequency pulse width modulation (VFPWM) circuit for input control of 6.78-MHz resonant wireless power transfer (WPT) systems.
Li-Chuan Tang +3 more
doaj +1 more source
FEBS Letters, EarlyView.An unexpected alternative interaction site for ethyl viologen was identified in formate dehydrogenase 1 from Methylorubrum extorquens. Combined mutagenesis, kinetic analysis, and docking revealed that aromatic residues near an iron–sulfur cluster enable flavin mononucleotide‐independent electron transfer, offering a framework for engineering improved ...
Eleni G. Poloniataki, Yong Hwan Kim
wiley +1 more source
Energies, 2021 In this study, we implemented a depletion (D)-mode gallium nitride high electron mobility transistor (GaN HEMT, which has the advantage of having no body diode) in a class-E amplifier.
You-Chen Weng +3 more
doaj +1 more source
From mice to humans—divergent strategies for intestinal homeostasis and regeneration
FEBS Letters, EarlyView.Recent advances such as organoid genome editing, xenotransplantation, imaging, and whole‐genome sequencing have enabled direct studies of human intestinal stem cells (ISCs). These studies reveal species‐specific features, including slower ISC proliferation, distinct injury responses, slower somatic mutation accumulation in humans, and an inverse ...
Keiko Ishikawa +2 more
wiley +1 more source
Delta Sigma Modulated Class D Audio Amplifier [PDF]
, 2007 在商用的行動電子設備中，電池的續行力是個很重要的問題。現今的行動電話，個人數位助理，數位隨身聽等等。都期望有長時間的電池供應時間。因此電子裝置的功率效率越來越受到重視。 在許多的電子設備中，都有音訊的輸出裝置。傳統上的音訊輸出裝置是由A類輸出級，AB類輸出級或B類輸出級組成。但是傳統的輸出級體積大，功率效率低，而且容易發熱。因此，因應而生的D類輸出級便有了體積小，效率高等等的優點，可以更適用在現今的電子裝置中。 一般的使用D類輸出級之音頻放大器，都採用脈寬調變技術(Pulse Width
廖澤儒, Ru, Liao - Tze
core
2.45 GHz Class E Power Amplifier for a Transmitter Combining LINC and EER
Acta Polytechnica, 2009 A 10 W class-E RF power amplifier (PA) is designed and fabricated using a Cree GaN HEMT. The proposed PA uses an innovative input circuit to optimize band with. At 2.45 GHz the PA achieves a PAE of 60 % at an outputpower of 40 dBm.
M. Dirix, O. Koch
doaj
FEBS Letters, EarlyView.Inositol pyrophosphates are energy‐rich signaling molecules that perform critical functions in cells. Three different families of phosphatases hydrolyze the β phosphate of the inositol pyrophosphate molecules: two have narrow specificities and one is promiscuous.
Ronda J. Rolfes
wiley +1 more source
CMOS Highly-Efficient Class-D Audio Amplifier [PDF]
, 2007 A one-chip integrated circuit of a 2-W class-D audio power amplifier with very high efficiency using a CMOS technology is presented. Compared with traditional class-AB amplifiers that are very poor at efficiency, most below 50%, the proposed class-D ...
杜明哲, Du, Ming-Jhe
core
High Efficient CMOS Class-E Power Amplifier with a New Output Power Control Scheme [PDF]
Journal of Electrical and Electronics Engineering, 2013 This paper presents the design of a novel RF power amplifier (PA) with a new output power control scheme suitable for RF-ICs and portable systems. Employing a class-E amplifier as a drivertogether with soft-switching property of the main power stage ...
MESHKIN Reza +3 more
doaj