Results 141 to 150 of about 1,679 (172)

Measuring stress relaxation in a compression relaxometer

Journal of Non-Crystalline Solids, 1992
In stress relaxation measurements, utilizing a sample in the shape of a thick cylinder the stiffness of the sample is typically greater than the stiffness of the measuring unit of the device. In this case, the observed stress relaxation time may be orders of magnitude greater than that expected from the viscosity over shear modulus ratio.
Steven N. Crichton, Simon M. Rekhson
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A Recording Stress Relaxometer

Review of Scientific Instruments, 1952
A recording stress relaxometer is described. This instrument measures the lateral deflection of bowed steel strips in the load-measuring element. The deflection is measured electrically by means of a linear differential transformer coupled to a recording potentiometer through an ac electronic voltmeter.
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Simulation study of a novel Relaxometer shield design

2015 5th International Workshop on Magnetic Particle Imaging (IWMPI), 2015
Developing tracers for MPI and related applications requires a thorough understanding of underlying relaxation processes. In X-Space MPI reconstruction, relaxation has a profound impact on the image through a decrease in SNR and direction-dependent blurring.
L. M. Bauer, D. W. Hensley, P. W. Goodwill, S. M. Conolly, M. A. Griswold   +4 more
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Method of liquid consumption measuring in nuclear magnetic flowmeters-relaxometers

Izmeritel`naya Tekhnika, 2023
The need to expand the functionality of systems for monitoring the parameters of the flow of liquid media is substantiated. The advantages of using meters based on the phenomenon of nuclear magnetic resonance to control the parameters of the flow of liquid media are noted. Let us consider the problems that arise during the operation of nuclear magnetic
Vadim V. Davydov, A. A. Gol’dberg, V. I. Dudkin, R. V. Davydov   +3 more
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Helical Spring Stress Relaxometer

Rubber Chemistry and Technology, 1957
Abstract Changes in the tensile properties of rubber are obviously of great practical importance. Consequently, measurements of the change in force required to maintain or produce a given extension under controlled conditions of temperature and atmosphere have frequently been made and have advanced our understanding of the physical process of ...
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Using the NMR Relaxometer in Laboratory Petrophysical Analysis

Proceedings, 2013
In our laboratory the NMR method has been used for analysis of core samples. Inaccuracy of results has been estimated. All results have been compared with traditional methods of analysis. Pore space structure changes during different technical influence to rock, also when the drilling fluid flows through core, we used NMR relaxometer for determination ...
V.A. Vavilin, T.R. Galiev, E.V. Sorokina, A.A. Kunakasov   +3 more
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Methodical issues of investigations with laboratory NMR relaxometer

Proceedings, 2016
Pulsed nuclear magnetic resonance (NMR) is one of the most perspective methods for studying reservoir properties of the core samples. This report analyzes the methodological issues of laboratory studies with a portable NMR relaxometer. We propose a method and software for NMR experiment parameters selection, providing the highest level of the observed ...
L. Muravyev, S. Zhakov
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A Programmable Pulse Sequence Generator for an NMR Relaxometer

Instruments and Experimental Techniques, 2005
A pulse sequence generator for NMR relaxometer is described. The operation mode is loaded into the internal memory of the device by a program from a personal computer via a PCI bus. The project is realized on two MAX7000S and Cyclone (Altera) chips using the Qartus II 4.0 software.
R. N. Stolbunov, S. A. Chichikov, A. G. Lundin   +2 more
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An NMR Relaxometer for Measuring Age-Related Muscle Loss

Biomedical Engineering, 2021
The paper describes a table-type NMR-relaxometer for measuring spin-spin relaxation times of protons in living tissues. The proton spin relaxation times depend on the average number of paramagnetic centers in the medium under study; in particular, they are indicative of the difference in the intensity of the metabolic processes in the cellular ...
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Untuned MPI relaxometer for nanoparticle characterization at arbitrary frequencies

2015 5th International Workshop on Magnetic Particle Imaging (IWMPI), 2015
MPI resolution and SNR are driven by the magnetic response of the iron oxide nanoparticles. Prior work has shown that magnetic nanoparticles respond differently to a wide range of excitation frequencies and amplitudes. Most prior work on MPI spectrometers and relaxometers have tuned the transmit coil at a single frequency.1-3 In contrast, in this work,
Zhi Wei Tay, Patrick W. Goodwill, Daniel W. Hensley, Steven Conolly   +3 more
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