Multi-realisation Full-field History-matching For Cbm Resources A New Approach With Global Optimisation Coupled With Geo-statistical Filtering.

2013 ◽  
Author(s):  
Haitham Nasri ◽  
Alvin Chua ◽  
Laurent Didier Alessio ◽  
Sophoana Pan ◽  
Clement Thian Urn Lee
Keyword(s):  
History Matching ◽  
Global Optimisation ◽  
New Approach ◽  
Full Field

Multi-Realisation Full-Field History-Matching For CBM Resources a New Approach with Global Optimisation Coupled with Geo-Statistical Filtering

2013 ◽  
Author(s):  
Laurent D. Alessio ◽  
Haitham Nasri ◽  
Sophoana Pan ◽  
Lee Thian Urn Clement ◽  
Chua Ket Peng
Keyword(s):  
History Matching ◽  
Global Optimisation ◽  
New Approach ◽  
Full Field

scholarly journals Enhancement of Region of Interest CT Reconstructions through Multimodal Data

2018 ◽  
Vol 4 (1) ◽  
pp. 331-335
Author(s):  
David Schote ◽  
Tim Pfeiffer ◽  
Georg Rose
Keyword(s):  
Substantial Reduction ◽  
Region Of Interest ◽  
Proof Of Concept ◽  
Multimodal Data ◽  
New Approach ◽  
Full Field ◽  
Lack Of Information ◽  
Ct Data ◽  
Flight Measurements

AbstractComputed tomography (CT) scans are frequently used intraoperatively, for example to control the positioning of implants during intervention. Often, to provide the required information, a full field of view is unnecessary. I nstead, the region-of-interest (ROI) imaging can be performed, allowing for substantial reduction in the applied X-ray dose. However, ROI imaging leads to data inconsistencies, caused by the truncation of the projections. This lack of information severely impairs the quality of the reconstructed images. This study presents a proof-of-concept for a new approach that combines the incomplete CT data with ultrasound data and time of flight measurements in order to restore some of the lacking information. The routine is evaluated in a simulation study using the original Shepp-Logan phantom in ROI cases with different degrees of truncation. Image quality is assessed by means of normalized root mean square error. The proposed method significantly reduces truncation artifacts in the reconstructions and achieves considerable radiation exposure reductions.

A New Approach to Perform a Probabilistic and Multi-objective History Matching

2014 ◽  
Author(s):  
Forlan La Rosa Almeida ◽  
Alessandra Davolio ◽  
Denis Jose Schiozer
Keyword(s):  
History Matching ◽  
New Approach ◽  
Multi Objective

Streamlines Guided Assisted History Matching Methodology: A New Approach

2015 ◽  
Author(s):  
Majdi A. Baddourah ◽  
Ali A. Alturki ◽  
Ahmed S. Al-Zawawi ◽  
M. Ehtesham Hayder ◽  
Babatunde Moriwawon
Keyword(s):  
History Matching ◽  
New Approach ◽  
Assisted History Matching

Evaluation of Two-Parameter Approaches to Describe Crack-Tip Fields in Engineering Structures

2009 ◽  
Vol 131 (3) ◽  
Author(s):  
Simon Kamel ◽  
Noel P. O’Dowd ◽  
Kamran M. Nikbin
Keyword(s):  
Power Law ◽  
Crack Tip ◽  
Tensile Behavior ◽  
Material Behavior ◽  
Stress Fields ◽  
Strain Hardening Exponent ◽  
Engineering Structures ◽  
New Approach ◽  
Full Field ◽  
Two Parameter

The application of two-parameter approaches to describe crack-tip stress fields has generally focused on Ramberg–Osgood (RO) power law material behavior, which limits the range of applicability of such approaches. In this work we consider the applicability of a J-Q or J-A2 approach (the latter is designated here as the J-A approach) to describe the stress fields for RO power law materials and for a material whose tensile behavior is not described by a RO model. The predictions of the two-parameter approaches are compared with full field finite-element predictions. Results are presented for shallow and deep-cracked tension and bend geometries, as these are expected to provide the expected range of constraint conditions in practice. A new approach for evaluating Q is proposed for a RO material, which, for a given geometry, makes Q dependent only on the strain hardening exponent.

A New Approach to Stress Analysis of Vascular Devices Using High Resolution Thermoelastic Stress Analysis

2006 ◽  
Vol 5-6 ◽  
pp. 63-70 ◽  
Author(s):  
James Eaton-Evans ◽  
Janice M. Dulieu-Barton ◽  
Edward G. Little ◽  
Ian A. Brown
Keyword(s):  
High Resolution ◽  
Stress Analysis ◽  
Medical Devices ◽  
Thermoelastic Stress ◽  
Thermoelastic Stress Analysis ◽  
New Approach ◽  
Full Field ◽  
Vascular Stents ◽  
Thermoelastic Response ◽  
Quantitative Stress

Thermoelastic Stress Analysis (TSA) is a non-contacting technique that provides full field stress information and can record high-resolution measurements from small structures. The work presented in this paper summarises the application of TSA to two types of small medical devices that are used to treat diseased arteries; angioplasty balloons and vascular stents. The use of high resolution optics is described along with a calibration methodology that allows quantitative stress measurements to be taken from the balloon structure. A brief account of a study undertaken to characterise the thermoelastic response from Nitinol is also included and it is demonstrated that thermoelastic data can be obtained from a stent at high resolutions.

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