A novel 4 by 4 array of electromagnetic micro-actuators operating on the principle of voice-coil actuators is presented. The intended application of the array is dynamic tactile stimulation, where multiple actuators generate an illusion of touching a moving pattern. In comparison to earlier designs [1-3], the device has smaller dimensions of 2.28 mm in diameter and 7 mm in length, which allowed...

Electrical conductivity of metal plates is measured by two distinct methods and the uncertainty associated with each method is evaluated. First, the impedance of an air-cored eddy-current coil is measured in the frequency range 100 Hz to 20 kHz. Corrections are made to account for the fact that the coil is not a pure inductor but exhibits finite resistance and capacitance in and between the win...

Introduction. The development of transceiver volume coils for high field MRI is still a very dynamic field of investigation and development. A volume coil based on the high frequency cavity resonator [1] is presented in this paper for whole-body MRI of rodents at 7 Tesla (proton frequency: 299.47 MHz). This coil design has been previously tested on phantoms at 170 MHz (4T for protons) with stan...

Introduction: Clinic hyperpolarized He gas human lung imaging has been widely conducted in recent years. Multi-channel coil designed for human lung parallel imaging has been reported [1] to accelerate the imaging speed. Large asymmetric birdcage coil were also developed to replace the single loop coil for better B1 homogeneity [2]. This work presents a design of a coil system for hyperpolarized...

Increasing evidence demonstrates the importance of long coiled-coil proteins for the spatial organization of cellular processes. Although several protein classes with long coiled-coil domains have been studied in animals and yeast, our knowledge about plant long coiled-coil proteins is very limited. The repeat nature of the coiled-coil sequence motif often prevents the simple identification of ...

The Levitated Dipole Experiment (LDX) explores the physics of high-temperature plasmas confined by a dipole magnetic field. Stable high-beta plasma has been created and confined by the magnetic field of a superconducting coil. Discharges containing trapped electrons form when microwaves cause strong perpendicular heating at cyclotron resonance. To eliminate the losses to the supports, the magne...

[Introduction] When a radio frequency (RF) coil is designed and built for MR imaging, its performance is judged on the basis of achieving uniform imaging B1field and high signal-to-noise ratio (SNR). However, there is an intrinsic trade-off between B1-field uniformity and high SNR in the configuration of RF coil; a large RF coil tends to generate a more uniform B1-field but lower SNR, because i...

The Levitated Dipole Experiment (LDX) is an innovative approach to explore the magnetic confinement of fusion plasmas. A superconducting solenoid (floating coil) is magnetically levitated for up to 8 hours in the center of a 5-meter diameter vacuum vessel. This coil is supported by a Levitating Coil (L-Coil) on top of the vacuum vessel. In the initial machine design, this Levitating Coil was a ...

INTRODUCTION The purpose of this study was to demonstrate the feasibility and efficiency of cardiac MR at 3 Tesla using local four-channel RF coil transmission and benchmark it against large volume body RF coil excitation. METHODS Electromagnetic field simulations are conducted to detail RF power deposition, transmission field uniformity and efficiency for local and body RF coil transmission....

In this work, we propose and investigate a volume coil array design method using different types of birdcage coils for MR imaging. Unlike the conventional radiofrequency (RF) coil arrays of which the array elements are surface coils, the proposed volume coil array consists of a set of independent volume coils including a conventional birdcage coil, a transverse birdcage coil, and a helix birdca...