Results 41 to 50 of about 980 (262)
Hemispherical gradient coils for magnetic resonance imaging [PDF]
Magnetic Resonance in Medicine, 2005 AbstractHemispherical gradient coils offer an open geometry that is well suited to imaging of the human brain. The windings of a hemispherical gradient coil are on average closer to the target region than those of a comparable cylindrical coil, and consequently hemispherical coils can produce higher efficiency at fixed inductance.
Dan, Green +2 more
openaire +2 more sources
The Analysis and Simulation with the Fatigue Life of Hemispherical Resonator Gyro [PDF]
Journal of Sensors, 2021 The life and damage of hemispherical resonator are important factors that directly affect the service time and safety of high‐precision hemispherical resonator gyro. However, the fused silica glass material used in the hemispherical resonator which was processed in China is mainly imported, and it is too expensive to use the traditional fatigue life ...
Lijun Song +5 more
openaire +1 more source
Summation of Powers in Open Resonator with Slotted Coupling Elements
Advanced Electromagnetics, 2021 The paper analyzes the summation of the powers of two sources in a hemispherical open resonator (OR) during its tuning. The first higher axially asymmetric TEM10q oscillation mode is excited in the resonator.
I. Kuzmichev +2 more
doaj +1 more source
Hemispherical Resonator of a Rate-integrating Gyroscope: A Novel Method for Determination of Eigenfrequencies and Eigenforms in Presence of Imperfections [PDF]
Journal of Applied and Computational Mechanics, 2023 This paper investigates the problem of free vibrations of a hemispherical shell resonator of a rate-integrating gyroscope. A new realization of the approximate Ritz method for determining the frequencies and forms of free vibrations of an elastic ...
Dmitry Indeitsev +3 more
doaj +1 more source
Effect of Uneven Electrostatic Forces on the Dynamic Characteristics of Capacitive Hemispherical Resonator Gyroscopes. [PDF]
Sensors (Basel), 2019 The hemispherical resonator gyroscope (HRG) is a typical capacitive Coriolis vibratory gyroscope whose performance is inevitably influenced by the uneven electrostatic forces caused by the uneven excitation capacitance gap between the resonator and outer
Xu Z, Yi G, Er MJ, Huang C.
europepmc +2 more sources
Electrostatic resonances of a negative-permittivity hemisphere [PDF]
Journal of Applied Physics, 2008 This article studies the electric response of an electrically small hemispherical object with negative permittivity by computing its polarizability which is determined by two orthogonal components, the axial one and the transverse one. A certain range of negative permittivity values is found where the mathematical determination of the polarizability ...
Kettunen, H., Wallén, H., Sihvola, A.
openaire +2 more sources
Resonant hemispherical dielectric antenna
Electronics Letters, 1984 An antenna consisting of a resonant dielectric hemisphere on top of a ground plane is investigated. Calculations of the internal and external fields are made with emphasis on the lowest-order mode that results in efficient radiation in the direction perpendicular to the ground plane.
M.W. McAllister, S.A. Long
openaire +1 more source
Traveling-wave thermoacoustic refrigerator with curved and tapered surfaces to minimize streaming
Invention Disclosure, 2022 The present article describes a traveling-wave thermoacoustic refrigeration system driven by a thermoacoustic heat engine. The coupled engine-refrigerator system consists of a resonator tube, which the thermoacoustic engine and thermoacoustic ...
Mohsen Bahrami, Fathollah Ommi
doaj +1 more source
Micromachines, 2022 The geometric accuracy of a hemispherical shell resonator (HSR) affects the assembly accuracy and final performance of a hemispherical resonant gyroscope in many ways.
Yu Wang +3 more
doaj +1 more source
AN OPEN RESONATOR LOADED WITH A RECTANGULAR WAVEGUIDE SECTION
Radio Physics and Radio Astronomy, 2014 A hemispherical open resonator with a rectangular waveguide section mounted at the center of the open resonator plane mirror is considered. A theoretical analysis has been made to find out that the excitation efficiency of the waveguide wave TE10 excited
I. K. Kuz'michev
doaj +1 more source