Results 31 to 40 of about 591 (186)
Quarterly Journal of the Royal Meteorological Society, Volume 149, Issue 755, Page 2527-2549, July 2023 Part B., 2023 Abbreviations: LES, large‐eddy simulation; NWP, numerical weather prediction; SRTM, Shuttle Radar Topography Mission data; TOFD, turbulent orographic form drag. Abstract This paper presents a turbulent orographic form drag (TOFD) parameterization scheme that takes into account the directional effects stemming from the angle between the low‐level wind ...
Haile Xue, Xueshun Shen
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Advances in Meteorology, Volume 2022, Issue 1, 2022., 2022 Complex orography is still a big challenge for all numerical weather prediction (NWP) models. Orography is an important factor that affects the NWP results. The orography in NWP mainly affects the main accuracy of the results through two aspects: orographic representation in models dynamics and orography‐related parameterization schemes in the physical
Yingjie Wang, Jianping Wu, Feng Chen
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Research progress in ultrasonic testing for friction stir welding of aluminum alloy
Cailiao gongcheng, 2022 The defects in friction stir welding (FSW) of aluminum alloy, e.g., tunnel defect, lack of penetration (LOP) and kissing bond, are with complex shape and narrow gap by inappropriate welding parameters.
JIN Shijie, TIAN Xin, LIN Li
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Ultrasonic signal acquisition system for TOFD imaging
IOP Conference Series: Materials Science and Engineering, 2020 Abstract This article describes the development of an application to capture and process ultrasonic signals that will lead to the formation of flight time diffraction images, TOFD. In this way the theoretical basis of operation of this technique is presented establishing concepts such as type A and type D scanning.
J Casagua, J Rodríguez, D Segura
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Materials & Design, 2021 Automated in-process Non-Destructive Testing (NDT) systems are rapidly gaining traction within the manufacturing industry as they reduce manufacturing time and costs.
Ehsan Mohseni +12 more
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Simulation of the TOFD technique using the finite element method
, 2007 The ultrasonic Time-of-Flight Diffraction (TOFD) technique is a well-known technique for defect sizing. This technique has been applied to thick sections (>15 mm).
Rao, C Lakshmana +2 more
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H2‐Driven Flavin Recycling Supports Biocatalytic Halogenation by Flavin‐Dependent Halogenase
ChemCatChem, Volume 18, Issue 2, 28 January 2026.Use of a H2‐driven flavin recycling system based on the O2‐tolerant [NiFe] hydrogenase 1 from E. coli supports efficient halogenation catalyzed by the flavin‐dependent halogenase, PyrH. Operation under atmospheric H2 with controlled delivery of safe, low‐level O2 enables intensification of biocatalytic halogenation.
Jiayu Peng +2 more
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Multiframe Ultrasonic TOFD Weld Inspection Imaging Based on Wavelet Transform and Image Registration [PDF]
, 2018 TOFD (time of flight diffraction) is a kind of weld defect detection technology by using ultrasonic diffraction wave signal. Because the diffraction intensity is far less than ultrasonic echo wave intensity, thus, the noise contained in TOFD signal is ...
Xiaorong Gao +4 more
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Defect recognition of circumferential welds of pipelines in TOFD images based on YOLOv5
Hanjie xuebaoIn order to enhance defect recognition in time-of-flight diffraction (TOFD) scan images for circumferential welds of pipelines under conditions such as background signal interference and uneven sample distribution, an improved YOLOv5s network model was ...
Cheng XU +3 more
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Quarterly Journal of the Royal Meteorological Society, Volume 151, Issue 772, October 2025 Part A.Marine winds near coastal Antarctica are important for sea‐ice variability and ocean circulation. We test the sensitivity of simulated winds to varying uncertain aspects of the atmospheric model configuration. Winds (each configuration a coloured solid line in the figure) are sensitive to model physics, and notably we find that wind stress over a ...
Thomas Caton Harrison +5 more
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