Results 11 to 20 of about 252 (152)

Improving Sandstorm Simulations by Parameterizing Form Drag From Subgrid Sand Dunes Using 30‐m‐Resolution Terrain Data

Geophysical Research Letters
Surface and near‐surface wind speeds, critical factors for dust emission, are often overestimated in desert regions by models, leading to exaggerated predictions of sandstorm extent and dust concentration. This study implements a new turbulent orographic
Huoqing Li, Haile Xue, Minzhong Wang, Chenghai Wang, Yisilamu Wulayin, Zonghui Liu, Wen Huo   +6 more
doaj   +2 more sources

CIVA Confirmation of Frequency Dependence of TOFD Lateral Wave

e-Journal of Nondestructive Testing
Pulse-duration (ring-time) of the TOFD (Time of Flight Diffraction) lateral wave has been assumed to be based on the nominal frequency of the probe. With the improved damping used for TOFD applications, these probes now have had their ring-time reduced ...
Edward Ginzel, Edward Ginzel
doaj   +2 more sources

A Novel Method for Ultrasonic Evaluation of Horizontal Defects Using Time-of-Flight Diffraction [PDF]

Iranian Journal of Oil & Gas Science and Technology, 2014
Time-of-flight diffraction method (ToFD) is an amplitude-independent sizing method which is based on the measurement of time-of-flight of defect tip diffracted waves.
Parastoo Bagheri, Sina Sodagar, Gholamreza Rashed, Amin Yaghootian   +3 more
doaj   +1 more source

Modeling of ultrasonic testing Time of Flight Diffraction (ToFD) technique by Finite Element Method [PDF]

مجله مدل سازی در مهندسی, 2015
Time-of-flight diffraction (ToFD) is an ultrasonic nondestructive testing technique used for detection, sizing and location of defects in industrial parts. This method has better abilities and benefits than other nondestructive testing techniques.
Somayeh Khorasani, Farhang Honarvar
doaj   +1 more source

Système de contrôle novateur basé sur la technique UT TOFD

e-Journal of Nondestructive Testing, 2023
Du fait de ses nombreux avantages en termes de facilité de mise en oeuvre, de vitesse d’examen, de performances de détection et de caractérisation des indications, la technique de contrôle TOFD (Time of Flight Diffraction) est de plus en plus utilisée ...
Michel Cence, Weina Ke, Celia Chevallier
doaj   +1 more source

Non-contacted Permanent Magnetic Absorbed Wall-climbing Robot for Ultrasonic Weld Inspection of Spherical Tank [PDF]

MATEC Web of Conferences, 2019
A novel wall-climbing robot for the onsite weld inspecting of spherical tank with Time of Flight Diffraction (TOFD) method has been developed, in order to liberate operators from dangerous and heavy working environment.
Ding Yulin, Sun Zhenguo, Chen Qiang
doaj   +1 more source

Multi-Mode Total Focusing Method (MTFM) to Detect High-Temperature Hydrogen Attack (HTHA) – A Review

Journal of Materials Exploration and Findings, 2023
High temperature hydrogen attack (HTHA) is a commonly observed harm component in carbon steels exposed to high temperature and pressure in a hydrogen-rich environment. Hydrogen together with carbon responds to produce methane.
Anjar Oktikawati, Rini Riastuti, Nursidi Yuanto   +2 more
doaj   +1 more source

Identification of nonregular indication according to change of grain size/surface geometry in nuclear power plant (NPP) reactor vessel (RV)-upper head alloy 690 penetration

Nuclear Engineering and Technology, 2017
During the fabrication process of reactor vessel head penetration (RVHP), the grain size of the tube material can be changed by hot or cold work and the inner side of the tube can also be shrunk due to welding outside of the tube. Several nonregular time-
Kyungcho Kim, Changkuen Kim, Hunhee Kim, Hak-Joon Kim, Jin-Gyum Kim, Myungjo Jhung   +5 more
doaj   +1 more source

TOFD Defect Image Recognition Based on YOLOv7

Journal of Physics: Conference Series, 2023
Abstract Welding technology is an important link in shipbuilding, and ultrasonic diffraction time difference method is one of its important inspection means, but the identification of its TOFD image still mainly relies on manual evaluation.
Xiongfang Fan, Jiawan Tan, Jianfeng Zhang, Yanfeng Gong, Hairui Zhang, Chunsen Huang, Junlong Chen   +6 more
openaire   +1 more source

Large‐scale system identification using self‐adaptive penguin search algorithm

IET Control Theory &Applications, Volume 17, Issue 17, Page 2292-2303, November 2023., 2023
This research addresses the non‐linear large‐scale system identification problem under the consideration of two systems: bilinear system and Volterra system as the large‐scale system identification. This work proposes a novel algorithm, called Self Adaptive Penguin Search Optimization (SAPeSO), to attain the system characteristics properly and minimize
Karthikeyan Udaichi, Ravi Chinaveer Nagappan, Miguel Garcia‐Torres, Parameshchari Bidare Divakarachari, Shankar Nayak Bhukya   +4 more
wiley   +1 more source