Results 161 to 170 of about 5,400,490 (233)

Fast reconstruction of 3-D defect profile from MFL signals using key physics-based parameters and SVM

NDT & E international, 2019
Fast reconstruction of three-dimensional (3-D) defect profile from three-axis magnetic flux leakage (MFL) signals is important to the pipeline inline inspection (ILI) in the oil and gas industry.
Piao Guanyu, G. Jingbo, Hu Tiehua, H. Leung, Yiming Deng   +4 more
semanticscholar   +1 more source

Fourier-Transform Approach for Reconstructing Macromolecular Mass Defect Profiles

Journal of the American Society for Mass Spectrometry, 2021
State-of-the-art native mass spectrometry (MS) methods have been developed for analysis of highly heterogeneous intact complexes and have provided much insight into the structure and properties of noncovalent assemblies that can be difficult to study using denatured proteins.
Andrew K. Swansiger, Michael T. Marty, James S. Prell   +2 more
openaire   +2 more sources

A Target-Focusing Optimization Method for 3-D Profile Reconstruction of Defects Using MFL Measurements

IEEE Transactions on Instrumentation and Measurement, 2023
Magnetic flux leakage (MFL) testing is a nondestructive testing method widely used in metal defect detection. Using measurements to accurately reconstruct the defect profile is one of the urgent problems in the field of MFL detection. The existing defect
Difei Hou, Senxiang Lu, Guangmo Yi, Junxiang Qiu, Jinhai Liu   +4 more
semanticscholar   +1 more source

Improved defect profiling with slow positrons

Applied Surface Science, 2002
Monoenergetic positrons are widely used to study defects in near-surface regions and buried interfaces of solids. Depth information is usually obtained by varying the positron implantation energy. However, at energies larger than 10 keV the stopping profile becomes much broader than the positron diffusion length.
R Krause-Rehberg, F Börner, F Redmann, W Egger, G Kögel, P Sperr, W Triftshäuser   +6 more
openaire   +1 more source

A Reinforcement Learning-Based Reconstruction Method for Complex Defect Profiles in MFL Inspection

IEEE Transactions on Instrumentation and Measurement, 2021
Magnetic flux leakage (MFL) inspection is one of the most commonly used nondestructive evaluation (NDT) methods for detecting anomalies of ferromagnetic materials.
Zhenning Wu, Yiming Deng, Jinhai Liu, Lixing Wang   +3 more
semanticscholar   +1 more source

Induced Current Thermo-Electrical Impedance Tomography for Nonferromagnetic Metal Material Surface Defect Profile Reconstruction

IEEE Transactions on Industrial Informatics
Nonferromagnetic metal materials are widely used in industry. Defects generated during manufacture and use may lead to serious accidents. The defect reconstruction is important for nondestructive evaluation.
Xu Zhang, L. Bai, J. Zhang, Yiping Liang, Yuhua Cheng, Lulu Tian, Yong Duan   +6 more
semanticscholar   +1 more source

Electrochemical defect profiling for semiconductor heterostructures

Journal of Physics: Condensed Matter, 2002
A special selective electrochemical etching-based apparatus is presented which is appropriate for use in the in situ observation of the defects in heterostructures. The working of the set-up is demonstrated on InGaAs/ GaAs(001) heteroepitaxial systems where the epitaxial layer thickness is above the critical layer thickness.
 kos Nemcsics, J nos P Makai
openaire   +1 more source

Defect profiles in semiconductor structures

physica status solidi c, 2007
AbstractVariable‐energy positron annihilation spectroscopy (VEPAS) has found applications in structural and electronic analysis of thin films and near‐surface layers, nanoporous materials, ion implantation, silicon photonics, and vacancy engineering.
openaire   +1 more source

Defect profiling in organic semiconductor multilayers

Organic Electronics, 2012
Abstract Defect depth profile study has been carried out in organic semiconductor (OSC) multilayers to characterize the buried interfaces and layers using beam based positron annihilation spectroscopy. The bilayer and trilayer heterostructures (p–n, p–p and n–p–n) comprise of organic–organic and organic–inorganic (substrate) interfaces.
MAHESHWARI, P, PUJARI, PK, SHARMA, SK, SUDARSHAN, K, DUTTA, D, SAMANTA, S, SINGH, A, ASWAL, DK, KUMAR, RA, SAMAJDAR, I   +9 more
openaire   +2 more sources

FE analysis of extrusion defect and optimization of metal flow in porthole die for complex hollow aluminium profile

Transactions of Nonferrous Metals Society of China, 2018
To solve the defects of bottom concave appearing in the extrusion experiments of complex hollow aluminium profiles, a 3D finite element model for simulating steady-state porthole die extrusion process was established based on HyperXtrude software using ...
J. Yi, Zhen-hu Wang, Zhi-wen Liu, Jian-ming Zhang, Xin He   +4 more
semanticscholar   +1 more source