Results 41 to 50 of about 3,455 (216)

Uncertainty in the Representation of Orography in Weather and Climate Models and Implications for Parameterized Drag [PDF]

, 2019
The representation of orographic drag remains a major source of uncertainty for numerical weather prediction (NWP) and climate models. Its accuracy depends on contributions from both the model grid‐scale orography (GSO) and the subgrid‐scale orography ...
Andrew D. Elvidge, Annelize Niekerk, Ayrton Zadra, ECMWF IV, I. F. S, François Bouyssel, Irina Sandu, Masashi Ujiie, Mikhail A. Tolstykh, Nils Wedi, Sandu I., Simon B. Vosper, Souhail Boussetta   +11 more
core   +1 more source

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, Miguel A. Ramirez, Kylie A. Vincent   +2 more
wiley   +1 more source

Sensitivity of near‐surface marine winds and wind stress in coastal Antarctica to regional atmospheric model configuration

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, Adrian Lock, Thomas J. Bracegirdle, John C. King, Hua Lu, Alessandro Silvano   +5 more
wiley   +1 more source

Defect recognition of circumferential welds of pipelines in TOFD images based on YOLOv5

Hanjie xuebao
In 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, Shihao DONG, Zhengyu OU, Zandong HAN   +3 more
doaj   +1 more source

Detectability of Welding Imperfections in Non-Destructive PA and TOFD Ultrasonic Tests

Biuletyn Instytutu Spawalnictwa, 2022
The primary objective of the article was to compare the PA and TOFD ultrasonic technique-based detectability of internal imperfections in welded joints.
Borys Bednarek, Rafal Jurkiewicz, A. Rzeźnikiewicz   +2 more
semanticscholar   +1 more source

Ultrasonic flaw sizing—An overview [PDF]

, 2012
The time-of-flight diffraction (TOFD) technique is one of the most common sizing methods in practical use by industry today. This method was developed over 40 years ago and is based on the technology and state of knowledge present at that time.
Engle, Brady J., Li, Xiongbing, Schmerr, Lester W., Jr., Sedov, Alexander   +3 more
core   +2 more sources

Optical emission investigation of laser-produced MgB2 plume expanding in an Ar buffer gas

, 2002
Optical emission spectroscopy is used to study the dynamics of the plasma generated by pulsed-laser irradiation of a MgB2 target, both in vacuum and at different Ar buffer gas pressures.
Amoruso, S., Bruzzese, R., Ferdeghini, C., Spinelli, N., Velotta, R., Wang, X.   +5 more
core   +2 more sources

Fractional fourier transforms of hypercomplex signals [PDF]

, 2012
An overview is given to a new approach for obtaining generalized Fourier transforms in the context of hypercomplex analysis (or Clifford analysis). These transforms are applicable to higher-dimensional signals with several components and are different ...
De Bie, Hendrik, De Schepper, Nele
core   +1 more source

Structural and Kinetics Studies of N^O‐, O^N^O‐, and N^N‐ Schiff Base Mn Complexes as Highly Active Catalysts in the Ring‐Opening Polymerization of rac‐Lactides

European Journal of Inorganic Chemistry, Volume 28, Issue 19, July 12, 2025.
Mononuclear and multinuclear manganese of (imino)phenol/pyridine proligands have been structurally characterized. The complexes form active catalysts in the ring‐opening polymerization of rac‐lactides to give predominantly atactic (poly)lactides with moderate molecular weights and good control of the polymer microstructure.
Mnqobi Zikode, Asanda Ngwenya, Tabea Becker, Sonja Herres‐Pawlis, Stephen. O. Ojwach   +4 more
wiley   +1 more source

Austenitic Biomaterial Cracks Evaluation by Advanced Nondestructive Techniques

Advances in Electrical and Electronic Engineering, 2017
The article deals with Non-Destructive Evaluation (NDE) of austenitic stainless steels. Eddy current, ultrasonic testing and non-contact magnetic field mapping methods are used for this purpose.
Milan Smetana, Vladimir Chudacik, Radoslav Konar, Milos Mician   +3 more
doaj   +1 more source