Results 41 to 50 of about 88,039 (271)

A 2-MHz 2-kW voltage-source inverter for low-temperature plasma generators: implementation of fast switching with a third-order resonant circuit [PDF]

, 1999
This paper presents a specially designed third-order resonant circuit intended to achieve fast switching operation for a voltage-source series-resonant inverter using four MOSFETs.
Akagi, Hirofumi, Fujita, Hideaki
core   +1 more source

High-Frequency and High-Current Transmission Techniques for Multiple Earth Electrical Characteristic Measurement Systems Based on Adaptive Impedance Matching through Phase Comparison

Sensors
With the increase in groundwater exploration, underground mineral resource exploration, and non-destructive investigation of cultural relics, high-resolution earth electrical characteristic measurement has emerged as a mainstream technique owing to its ...
Kuiyuan Zhang, Shulin Yang, Meng Wang, Rongbo Zhang   +3 more
doaj   +1 more source

Study of Standing-Wave Thermoacoustic Electricity Generators for Low-Power Applications

Applied Sciences, 2018
This paper is concerned with the study of low-cost, low-power thermoacoustic electricity generators. Based on target electrical output power values of 50 and 100 W, three standing wave prototypes (of both one-stage and two-stage prototypes) integrating a
Antonio Piccolo
doaj   +1 more source

Automation of S-parameters measurements of high-power microwave transistors in a contact device with tunable strip matching circuits [PDF]

ITM Web of Conferences, 2019
In the practice by microwave power transistor amplifiers developing, the variable load method is usually used to determine the impedances of matching circuits in the complex conjugate matching mode. This solution involves the use of expensive equipment -
Evseev Vladimir, Ivlev Mikhail, Lupanova Elena, Nikulin Sergey, Petrov Vitaliy, Terentyev Andrey   +5 more
doaj   +1 more source

Non‐foster impedance matching sensitivity of electrically small electric and magnetic spherical dipole antennas

Electronics Letters, 2016
The impedance bandwidth (BW) improvement property of a self‐resonant folded spherical helix electric dipole and a spherical split ring (SSR) magnetic dipole is compared when a negative reactance element is loaded on the parasitic resonator of the antennas. They have the same electrical size of ka
I.‐J. Yoon, S. Christensen, V. Zhurbenko, O.S. Kim, O. Breinbjerg   +4 more
openaire   +1 more source

A Comparative Study of Cerebral Oxygenation During Exercise in Hemodialysis and Peritoneal Dialysis Patients

Therapeutic Apheresis and Dialysis, EarlyView.
ABSTRACT Introduction Cognitive impairment and exercise intolerance are common in dialysis patients. Cerebral perfusion and oxygenation play a major role in both cognitive function and exercise execution; HD session per se aggravates cerebral ischemia in this population. This study aimed to compare cerebral oxygenation and perfusion at rest and in mild
Marieta P. Theodorakopoulou, Konstantina Dipla, Danai Faitatzidou, Fotini Iatridi, Areti Georgiou, Artemios Karagiannidis, Erasmia Sampani, Chrysostomos Dimitriadis, Aggelos Koutlas, Andreas Zafeiridis, Pantelis Sarafidis   +10 more
wiley   +1 more source

Very Low Power Cockcroft-Walton Voltage Multiplier for RF Energy Harvesting Applications [PDF]

, 2019
A device was required that could harvest the electromagnetic energy present in ambient radio frequency (RF) signals. A part of this device must convert the AC RF signal received by the antenna into a DC signal that can be used in an embedded application.
Langdon, Trace
core   +2 more sources

Immittance Matching for Multi-dimensional Open-system Photonic Crystals

, 2003
An electromagnetic (EM) Bloch wave propagating in a photonic crystal (PC) is characterized by the immittance (impedance and admittance) of the wave. The immittance is used to investigate transmission and reflection at a surface or an interface of the PC.
A. Adibi, A. Adibi, A. Chutinan, A. Mekis, A. Mekis, A. Mekis, Akiko Gomyo, E. Miyai, E. Yablonovitch, H. Kosaka, H. Kosaka, H. Yamada, Hirohito Yamada, J. Ushida, Jun Ushida, K. Ohtaka, K. Sakoda, M. Notomi, Masatoshi Tokushima, Masayuki Shirane, N. Stefanou, S. A. Shelkunoff, S. Boscolo, S. G. Johnson, S. John, S. Noda, Steven G. Johnson, T. Minami, V. Yannopapas, W. M. Robertson, W. M. Robertson, Y. Ohtera, Y. Xu   +32 more
core   +1 more source

Theoretical modelling of frequency dependent elastic loss in composite piezoelectric transducers [PDF]

, 2007
The large number of degrees of freedom in the design of piezoelectric transducers requires a theoretical model that is computationally efficient so that a large number of iterations can be performed in the design optimisation.
Hayward, G., Mulholland, A.J., O'Leary, R.L., Orr, L., Parr, A.C.S., Pethrick, R.A.   +5 more
core   +1 more source

Developments of a Novel Impedance Matching Circuit for Electrically Small Antennas

Journal of Physics: Conference Series, 2006
In order to reduce the size of a wireless system, we have proposed the design formulas for an electrically small antenna (ESA), i.e. an antenna whose dimension is much smaller than a wavelength, with a miniaturized matching circuit which connects to a 50 ohm external circuit.
K Yoshida, S Sakaguchi, S Oda, H Kanaya
openaire   +1 more source