Results 121 to 130 of about 406,343 (328)

Spatiotemporal Analysis and Characterization of Multilayer Buried Cracks in Rails Using Swept-Frequency Eddy-Current-Pulsed Thermal Tomography

Applied Sciences
Rolling contact fatigue (RCF)-induced cracks in steel rails exhibit a fish-scale-shaped cluster distribution, and generally form in a layered, overlapping manner.
Wei Qiao, Yanghanqi Liu, Jiahao Jiao, Xiaotian Chen, Hengbo Zhang   +4 more
doaj   +1 more source

A Numerical Alternative to MR Thermometry for Safety Validation of Multi‐Channel RF Transmit Coils

Magnetic Resonance in Medicine, EarlyView.
ABSTRACT Purpose This study proposes a numerical technique to estimate peak local specific absorption rate (SAR) uncertainty of multi‐channel RF coils during the process of safety validation as an alternative to experimental temperature and electric‐field measurements, and demonstrates its use to enable human studies at 10.5 T.
Alireza Sadeghi‐Tarakameh, Simon Schmidt, Matt Waks, Russell L. Lagore, Andrea Grant, Edward Auerbach, Lance DelaBarre, Lasse Knudsen, Christophe Lenglet, Luca Vizioli, Essa Yacoub, Gregor Adriany, Gregory J. Metzger, Kamil Ugurbil, Yigitcan Eryaman   +14 more
wiley   +1 more source

Autonomy for MRI Field Cameras: Synchronization, Self‐Calibration, and Sequence Detection

Magnetic Resonance in Medicine, EarlyView.
ABSTRACT Purpose This work aims to provide a workflow for operating NMR field probes in MR scanners independently of pulse programming, scanner TTL trigger pulses and dedicated calibration sequences. Methods An independent timing system and limited prior knowledge about relative probe positions enable synchronous field measurement, probe position ...
Oskar Björkqvist, Klaas P. Pruessmann
wiley   +1 more source

Analysis of the Influence of Coil Placement on Pulsed Eddy Current Detection

南方能源建设
[Introduction] In the nuclear power plant, the steam pipeline is generally installed with an insulation layer on the outer wall to improve heat transfer efficiency.
Qi ZHU, Qin WANG, Yang HAN, Yalin ZHANG
doaj   +1 more source

Effect of Water Suppression and Metabolite Cycling on Quantification of 1H MRS Spectra in the Human Brain at 3 Tesla

Magnetic Resonance in Medicine, EarlyView.
ABSTRACT Purpose This study investigates the effect of VAPOR water suppression and metabolite cycling on metabolite quantification and macromolecules in proton magnetic resonance spectroscopy. Methods Single‐voxel semi‐LASER spectra (TR/TE = 3000/28 ms) and metabolite‐nulled spectra (macromolecules) were acquired in five healthy subjects in the ...
Dinesh K. Deelchand, Pierre‐Gilles Henry   +1 more
wiley   +1 more source

The NDT methods under high temperature service environment

MATEC Web of Conferences, 2016
Concerning the detective requirement of the equipment under high temperature running status, this paper summarizes the technical characteristics and related applications of several non-destructive testing methods(NDT), such as thermal infrared imaging ...
Zhang Zhen-guo, Feng Hui-xing, Zhao Wei-hua   +2 more
doaj   +1 more source

Convective, Diffusive Effects on Magnetic Fields and Eddy Current in Compulsators [PDF]

Compulsators are being designed at ever increasing energies and energy densities and are required to deliver energy to the load in less than 10 ms. These require high speeds of operation and dense spacing of conductors.
Min Chan, W., Ozdemir, M., Thiagarajan, V.   +2 more
core  

Solid-State Transformers for Interfacing Solar Panels to the Power Grid: An Optimum Design Methodology of a High Frequency Transformer for dc-dc Converter Applications [PDF]

, 2016
Nowadays the use of power electronic interfaces to integrate distributed generation with the power grid is becoming relevant due to the increased penetration of renewable energy sources like solar, and the continued ...
George, Kenny
core   +2 more sources

Mesoscale Whole‐Brain T2*‐Weighted and Associated Quantitative MRI in Humans at 10.5 T

Magnetic Resonance in Medicine, EarlyView.
ABSTRACT Purpose To demonstrate mesoscale whole‐brain T2*‐weighted (T2*w) MRI at 10.5 T, quantify R2* relaxation rate and magnetic susceptibility (χ), and evaluate T2*w contrast at such high field strength. Methods Multi‐echo GRE (ME‐GRE) data were collected in healthy adults at 0.5 mm isotropic resolution at 10.5 T.
Jiaen Liu, Peter van Gelderen, Jacco A. de Zwart, Jeff H. Duyn, Yujia Huang, Shuxian Qu, Andrea Grant, Edward J. Auerbach, Matt Waks, Russell L. Lagore, Lance Delabarre, Alireza Sadeghi‐Tarakameh, Yigitcan Eryaman, Gregor Adriany, Kamil Uğurbil, Xiaoping Wu   +15 more
wiley   +1 more source

Validating Numerical Simulations to Support Experimental Testing of MRI Gradient-Induced Heating of Passive Implants. [PDF]

Magn Reson Med
ABSTRACT Purpose Numerical simulations can be adopted to aid the evaluation of the interaction between switched gradient fields and metallic implants and estimate the possible temperature increase. Anyway, an analysis of the consistency of their prediction with experiments is lacking, differently from what can be found for exposure to radiofrequency ...
Zanovello U, Arduino A, Zilberti L, Schaefers G, Halaj M, Bottauscio O.   +5 more
europepmc   +2 more sources