scholarly journals Numerical simulation and analyze of magnetic resonance sounding with adiabatic pulse for groundwater exploration

2020 ◽  
Vol 69 (12) ◽  
pp. 123301
Author(s):  
Yu-Jing Yang ◽  
Han-Qing Zhao ◽  
Peng-Fei Wang ◽  
Ting-Ting Lin
Keyword(s):  
Numerical Simulation ◽  
Magnetic Resonance ◽  
Groundwater Exploration ◽  
Adiabatic Pulse ◽  
Magnetic Resonance Sounding

Development of Control System for MRS Groundwater Exploration Instrument Based on Ethernet

2014 ◽  
Vol 496-500 ◽  
pp. 1578-1581
Author(s):  
Da Wu ◽  
Qing Ming Duan ◽  
Ting Zhe Huang ◽  
Lei Zhang ◽  
Ying Jie Han ◽  
...  
Keyword(s):  
Control System ◽  
Magnetic Resonance ◽  
Data Processing ◽  
Data Storage ◽  
Data Transmission ◽  
Groundwater Exploration ◽  
Experimental Results ◽  
Average Error ◽  
Magnetic Resonance Sounding ◽  
Outdoor Experiments

The control system for Magnetic Resonance Sounding (MRS) groundwater exploration instrument was developed on the platform of LabVIEW. This system consists of transmission and reception sections. The former transmits current, controls power and acquires current and the latter controls amplifier, acquires MRS signals. In order to improve efficiency of data transmission, Ethernet based on TCP/IP is used in the system. Furthermore, the system has additional functions of pulse moment setting, equipment detection, data processing into pictures and data storage. Through outdoor experiments, it is found that the average error is less than 2%. The experimental results demonstrate the effectiveness and correctness of the system.

Locating water-filled karst caverns and estimating their volume using magnetic resonance soundings

Geophysics ◽  
2008 ◽  
Vol 73 (5) ◽  
pp. G51-G61 ◽  
Author(s):  
A. Legchenko ◽  
M. Ezersky ◽  
C. Camerlynck ◽  
A. Al-Zoubi ◽  
K. Chalikakis ◽  
...  
Keyword(s):  
Magnetic Resonance ◽  
Field Survey ◽  
Single Channel ◽  
Target Position ◽  
Numerical Data ◽  
Dead Sea ◽  
Groundwater Exploration ◽  
Volume Estimation ◽  
Estimation Errors ◽  
Magnetic Resonance Sounding

Magnetic resonance sounding (MRS) is a geophysical technique developed for groundwater exploration. This technique can be used for investigating karst aquifers. Generally, the study of a karst requires a 3D field setup and corresponding multichannel data-acquisition instruments. Now only single-channel MRS equipment is available; i.e., the time needed for a 3D MRS field survey is multiplied by a factor of four or five. Where karst caverns are natural hazards, as in the Dead Sea coastal area at Nahal Hever, Israel, even an approximate localization of potentially dangerous zones and a corresponding estimation of the hazard dimensions are useful. We studied numerically the accuracy of MRS estimations of the volume of different 3D targets aroundNahal Hever, shifting a 3D target inside the MRS loop and calculating the volume-estimation errors for each target position. The calculations covered targets of different sizes. The size and position of a target being unknown factors in a field survey, the numerical data were considered as random values to be analyzed statistically. Using a 1D approximation of the MRS solution and assuming a [Formula: see text] MRS loop, the volume of a 3D target under Nahal Hever conditions is estimated within a [Formula: see text] error when the target is smaller than the MRS loop, and within a [Formula: see text] error when the target size is about the same as the MRS loop. The lower threshold of karst-cavity detection with MRS is about [Formula: see text]. For such estimation, only one sounding is required.

Dialysate Pressure Isobars in a Hollow‐Fiber Dialyzer Determined from Magnetic Resonance Imaging and Numerical Simulation of Dialysate Flow

1998 ◽  
Vol 22 (10) ◽  
pp. 907-909 ◽  
Author(s):  
Toshiaki Osuga ◽  
Takayuki Obata ◽  
Hiroo Ikehira ◽  
Shuji Tanada ◽  
Yasuhito Sasaki ◽  
...  
Keyword(s):  
Magnetic Resonance Imaging ◽  
Numerical Simulation ◽  
Magnetic Resonance ◽  
Hollow Fiber ◽  
Resonance Imaging ◽  
Dialysate Flow

Numerical Simulation of Magnetic Resonance Experiments: Concepts and Applications to Static, Rotating and Double Rotating Experiments

1994 ◽  
Vol 49 (1-2) ◽  
pp. 80-88 ◽  
Author(s):  
M. Baldus ◽  
T. O. Levante ◽  
B. H. Meier
Keyword(s):  
Numerical Simulation ◽  
Magnetic Resonance ◽  
Object Oriented ◽  
Magic Angle Spinning ◽  
Spin Systems ◽  
Object Oriented Programming ◽  
Time Dependent ◽  
Magic Angle ◽  
Programming Environment ◽  
Angle Spinning

Abstract An object-oriented programming environment for numerical simulation of magnetic resonance spectra is introduced and applied to NQR and NMR of quadrupolar nuclei. Using a Floquet approach it is possible to perform simulations of spin systems that are described by explicitly time-dependent Hamiltonians in full analogy to simulations of time-independent systems. Applications to magic angle spinning and double rotation are discussed.

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