Results 211 to 220 of about 423,050 (241)

Measurement of ventricular three-dimensional torsion

Journal of Echocardiography, 2015
In this study, three-dimensional torsion angle of myocardium was extracted by two-dimensional images of the left ventricle at three levels of base, mid, and apex of interventricular septum wall.Two-dimensional echocardiography images of long- and short-axis views of healthy men were synchronized using an electrocardiogram of each individual and ...
Mosayyeb, Mobasheri, Manijhe, Mokhtari-Dizaji, Faride, Roshanali   +2 more
openaire   +2 more sources

Measurement of three-dimensional crossflow separation

AIAA Journal, 1998
Parameters and techniques for detecting the location of three-dimensional crossflow separations are evaluated using several data sets. Several definitions of separations and the physics of the separation process are discussed along with descriptions of the separated flowfield.
Todd G. Wetzel, Roger L. Simpson, Christopher J. Chesnakas   +2 more
openaire   +1 more source

Simple three-dimensional laser angle sensor for three-dimensional small-angle measurement

Applied Optics, 2004
A simple three-dimensional (3D) laser angle sensor for 3D measurement of small angles based on the diffraction theorem and on ray optics analysis is presented. The possibility of using position-sensitive detectors and a reflective diffraction grating to develop a 3D angle sensor was investigated and a prototype 3D laser angle sensor was designed and ...
Chien-Hung, Liu, Wen-Yuh, Jywe, S C, Tzeng   +2 more
openaire   +2 more sources

Light field three-dimensional measurement

Optical Measurement Systems for Industrial Inspection XI, 2019
This letter reports a novel method for light field three-dimensional measurement by using unfocused plenoptic cameras. A light field metric model, based on which nonmetric depths in the image space can be mapped to metric dimensions in the object space, was established.
Zewei Cai, Xiaoli Liu, Meihua Liao, Wenqi He, Giancarlo Pedrini, Wolfgang Osten, Xiang Peng   +6 more
openaire   +1 more source

Three dimensional crack closure measurements

23rd Aerospace Sciences Meeting, 1985
This paper describes fatigue crack growth and retardation experiments conducted in polycarbonate test specimens. This transparent model material allowed optical interferometry measurements of through-the-thickness fatigue crack opening profiles. Crack surface displacements were then obtained through the specimen thickness and are discussed in terms of ...
S. RAY, S. ANDREW
openaire   +1 more source

Underwater Three-Dimensional Measurements

2019
The main objective of this study is to demonstrate the possibility of underwater three-dimensional measurement (underwater SfM) in a coral reef area by structure from motion (SfM). The possibility of underwater SfM using a small submarine (small remotely operated vehicle, sROV) was also investigated.
Hiroyuki Obanawa, Yu Tabayashi, Tomokazu Murakami, Hiroyoshi Kohno, Shinya Shimokawa, Akira Mizutani   +5 more
openaire   +1 more source

Three-dimensional measurement by stereophotogrammetry

SPIE Proceedings, 2002
We show a possibility for a rapid measurement of the shape of objects using color coding by stochastically geneated fringe patterns.
Fritz Zoellner, Vladislav Matusevich, Richard M. Kowarschik   +2 more
openaire   +1 more source

Measuring three-dimensional soil deformation

Journal of Terramechanics, 1996
Abstract A laboratory system has been developed in which controlled surface loading can be applied to a constructed soil profile and the resultant deformation can be measured accurately in three dimensions. The system utilizes a 10m × 0.9m × 1.3 m rectangular bin composed of ten modular sections.
L.G. Wells, Zhang Yaping, Zhang Xiao Xing   +2 more
openaire   +1 more source

Measurement of three-dimensional permeability

Composites Part A: Applied Science and Manufacturing, 1998
This study investigates the possibility of using a three-dimensional radial flow test to measure permeability. As part of this investigation, compaction tests have been conducted to determine the fibre volume fraction as a function of the compaction pressure. Results from permeability tests are reported.
Weitzenbock, J.R., Shenoi, R.A., Wilson, P.A.   +2 more
openaire   +2 more sources

Measuring facial swelling using three-dimensional imaging

Medical Informatics, 1997
Requirements exist clinically for quantitative analysis of facial swelling. A quick and non-invasive measurement of facial volume is desirable. The acquisition of three-dimensional images, corresponding to spatial models of patients' facial surfaces, has been facilitated using a Spatial Vision System (SVS) developed by Thorn EMI Central Research ...
J, Bowskill, C, Baldock, P W, Booth
openaire   +2 more sources