Determination of Oil Core Flow Velocities and Porosities Using MRI

1992 ◽  
Author(s):  
M.A. Robinson ◽  
H.A. Deans ◽  
Sitanshu Bansal
Keyword(s):  
Core Flow ◽  
Flow Velocities

Middle cerebral artery: determination of flow velocities with MR angiography.

Radiology ◽  
1991 ◽  
Vol 181 (2) ◽  
pp. 527-530 ◽  
Author(s):  
H Mattle ◽  
R R Edelman ◽  
K U Wentz ◽  
M A Reis ◽  
D J Atkinson ◽  
...  
Keyword(s):  
Middle Cerebral Artery ◽  
Cerebral Artery ◽  
Mr Angiography ◽  
Flow Velocities

COMPREHENSIVE INVESTIGATION OF EXTRUSION OF П-SHAPED BRACKETS. REPORT 6. KINEMATIC AND STRESSED STATES OF BLANKET DURING RESTRICTED EXTRUSION. PART 2

2021 ◽  
pp. 38-43
Author(s):  
A. L. Vorontsov ◽  
◽  
S. M. Karpov ◽  
Keyword(s):  
Plastic Deformation ◽  
Plastic Flow ◽  
Plane Deformation ◽  
Flow Theory ◽  
Equation System ◽  
Extrusion Process ◽  
Thick Wall ◽  
Comprehensive Investigation ◽  
Flow Velocities

On the basis of the complete equation system of the plastic flow theory, the solution continuation of the determination problem of the kinematic and stressed states of a blanket during restricted extrusion of П-shaped brackets under conditions of plane deformation in the general case of a nonaligned placement of the punch and the die is stated. The determination of flow velocities and stresses in the area of plastic deformation, located under the punch end near the formed thick wall of the bracket has been carried out. The formulae were obtained, which are required for identification of the main parameters of the extrusion process of П-shaped products with a relatively thin horizontal bridge.

A heat pulse technique for the determination of small-scale flow directions and flow velocities in the streambed of sand-bed streams

2011 ◽  
Vol 25 (20) ◽  
pp. 3244-3255 ◽  
Author(s):  
Jörg Lewandowski ◽  
Lisa Angermann ◽  
Gunnar Nützmann ◽  
Jan H. Fleckenstein
Keyword(s):  
Heat Pulse ◽  
Small Scale ◽  
Pulse Technique ◽  
Flow Directions ◽  
Flow Velocities

Transcutaneous determination of aortic blood-flow velocities in man

1975 ◽  
Vol 89 (5) ◽  
pp. 605-612 ◽  
Author(s):  
Lee L. Huntsman ◽  
Emmeram Gams ◽  
Curtis C. Johnson ◽  
Eugene Fairbanks
Keyword(s):  
Blood Flow ◽  
Aortic Blood Flow ◽  
Aortic Blood ◽  
Blood Flow Velocities ◽  
Flow Velocities

scholarly journals COORDINATED RESEARCH PROJECT “DEVELOPMENT OF RADIOMETRIC METHODS AND MODELLING FOR MEASUREMENT OF SEDIMENT TRANSPORT

Scientia ◽  
2021 ◽  
Vol 22 (22) ◽  
pp. 149-164
Author(s):  
Carlos SEBASTIAN CALVO
Keyword(s):  
Groundwater Resources ◽  
Tritiated Water ◽  
Mining Company ◽  
Effect Mechanism ◽  
Influence Area ◽  
Tracer Techniques ◽  
First Case ◽  
Flow Velocities

The first case study, namely Evaluation of leakages in Peruvian mining tail deposits by the aid of radiotracers, corresponds to the evaluation of leakages in two tailing deposits have been performed in a Peruvian Mining Company, in Cusco-Peru, through the injection of tritiated water as a proper tracer, and the use of isotope and chemical techniques, in order to confirm the existence of filtrations in the neighborhood of such tailing deposits. The objective of the study was to establish a cause-effect mechanism between the two mineral tailing deposits and its corresponded influence area, as probably receipt bodies of contamination. As a result of the intensive operation, it was established a cause-effect mechanism between the deposits and its corresponded influence area as a receipt bodies of contamination by tailing elements. The second case study, namely “Determination of flow velocities in groundwater by the aid of tracer techniques” corresponds to the evaluation of the groundwater resources in Ica Region at the southern Peru, and reports methodologies andtechniques developed for on-site artificial tracer aided measurements of groundwater flow velocities. 

COMPREHENSIVE INVESTIGATION OF EXTRUSION OF П-SHAPED BRACKETS. REPORT 6. KINEMATIC AND STRESSED STATES OF BLANKET DURING RESTRICTED EXTRUSION. PART 1

2021 ◽  
pp. 33-40
Author(s):  
A. L. Vorontsov ◽  
◽  
S. M. Karpov ◽  
Keyword(s):  
Plastic Deformation ◽  
Plastic Flow ◽  
Plane Deformation ◽  
Flow Theory ◽  
Equation System ◽  
Extrusion Process ◽  
Thick Wall ◽  
Comprehensive Investigation ◽  
Flow Velocities

On the basis of the complete equation system of the plastic flow theory, the solution origination of the determination problem of the kinematic and stressed states of a blanket during restricted extrusion of П-shaped brackets under conditions of plane deformation in the general case of a nonaligned placement of a punch and a die is stated. The determination of flow velocities and stresses in the area of plastic deformation, located under a formed thick wall of the bracket has been carried out. The formulae were obtained, which are required for identification of the main parameters of the extrusion process of П-shaped products with a relatively thin horizontal bridge.

Determination of flow velocities in liquid-ring vacuum pumps and compressors

1985 ◽  
Vol 21 (3) ◽  
pp. 135-140
Author(s):  
L. T. Karaganov ◽  
V. A. Laptev
Keyword(s):  
Liquid Ring ◽  
Flow Velocities

Determination of flow velocities causing blowing and movement of solid particles

1987 ◽  
Vol 27 (6) ◽  
pp. 855-860 ◽  
Author(s):  
A. Azizov ◽  
V. R. Toshov
Keyword(s):  
Solid Particles ◽  
Flow Velocities

Determination of Flow Velocities from Magnetic Resonance Multiple Spin-Echo Images

1987 ◽  
Vol 28 (5) ◽  
pp. 643-648 ◽  
Author(s):  
F. Ståhlberg ◽  
O. Henriksen ◽  
C. Thomsen ◽  
M. Stubgaard ◽  
B. Persson
Keyword(s):  
Magnetic Resonance ◽  
Flow Velocity ◽  
Spin Echo ◽  
Phase Changes ◽  
Least Square ◽  
Slice Thickness ◽  
Plane Flow ◽  
Flow Phantom ◽  
Flow Velocities

The purpose of this study was to evaluate a method for the quantification of through-plane flow velocities by magnetic resonance imaging (MRI) from the flow characteristics of conventional multiple spin-echo (MSE) signals. Simulated inflow-outflow-dependent signals, as well as images of a flow phantom were generated and the logarithm of the flow-dependent signal value was plotted against echo time. The normalized slope of the resulting curve was calculated using a least-square fit to simulated and experimental data and was corrected for T2 relaxation effects by subtraction of a slope obtained at zero flow. After this correction, and with certain restrictions regarding the flow velocity (v), maximum number of echoes in the slope calculation and slice thickness (L), the normalized slope of the MSE signal becomes equal to the quotient v/L, and from this relation the flow velocity can be determined. The validity of the proposed method was examined for different flow velocities and for two opposite flow directions. The influence of the size of the region of interest and the number of spin echoes used in the calculation of the slope on the accuracy of the velocity determination was also studied. The sensitivity of the method to flow-induced phase changes was examined in the phantom by comparing the results obtained with different strengths of the slice-selective gradient as well as by comparing results from even-echo data with those from odd-echo data. When applied to simulated signal data, the method was found to be strictly valid only for a small velocity range, while for the flow phantom, the calculated velocities corresponded to measured velocities for values up to and over 100 mm/s. In the phantom experiment, the method was found to be insensitive to effects induced by combined changes of the slice thickness and the slice-selective gradient as well as to so-called even-echo rephasing effects. It is concluded that the examined method promises to be a rapid and easily interpretable alternative to other methods, e.g. magnetic resonance velocity-phase encoding, for the determination of flow velocities in vivo.

Novel method for determination of flow velocities with pulsed nuclear magnetic resonance

1978 ◽  
Vol 49 (8) ◽  
pp. 1217-1218 ◽  
Author(s):  
P. A. de Jager ◽  
M. A. Hemminga ◽  
A. Sonneveld
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
Novel Method ◽  
Pulsed Nuclear Magnetic Resonance ◽  
Nuclear Magnetic ◽  
Flow Velocities
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