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Improving MRI turbulence quantification by addressing the measurement errors caused by the derivatives of the turbulent velocity field - Sequence development and in-vitro validation.
Magn Reson Imaging
January 2025
Institute of Fluid Mechanics, University of Rostock, Rostock, Germany.
Purpose: To improve the current method for MRI turbulence quantification which is the intravoxel phase dispersion (IVPD) method. Turbulence is commonly characterized by the Reynolds stress tensor (RST) which describes the velocity covariance matrix. A major source for systematic errors in MRI is the sequence's sensitivity to the variance of the derivatives of velocity, such as the acceleration variance, which can lead to a substantial measurement bias.
View Article and Find Full Text PDFMeasuring the Risk Spillover Effect of RCEP Stock Markets: Evidence from the TVP-VAR Model and Transfer Entropy.
Entropy (Basel)
January 2025
School of Artificial Intelligence, Beijing Normal University, Beijing 100875, China.
This paper selects daily stock market trading data of RCEP member countries from 3 December 2007 to 9 December 2024 and employs the Time-Varying Parameter Vector Autoregression (TVP-VAR) model and transfer entropy to measure the time-varying volatility spillover effects among the stock markets of the sampled countries. The results indicate that the signing of the RCEP has strengthened the interconnectedness of member countries' stock markets, with an overall upward trend in volatility spillover effects, which become even more pronounced during periods of financial turbulence. Within the structure of RCEP member stock markets, China is identified as a net risk receiver, while countries like Japan and South Korea act as net risk spillover contributors.
View Article and Find Full Text PDFBrown Carbon in East Asia: Seasonality, Sources, and Influences on Regional Climate and Air Quality.
ACS Environ Au
January 2025
Department of Geography, Hong Kong Baptist University, Hong Kong SAR 999077, China.
Brown carbon (BrC) has been recognized as an important light-absorbing carbonaceous aerosol, yet understanding of its influence on regional climate and air quality has been lacking, mainly due to the ignorance of regional coupled meteorology-chemistry models. Besides, assumptions about its emissions in previous explorations might cause large uncertainties in estimates. Here, we implemented a BrC module into the WRF-Chem model that considers source-dependent absorption and avoids uncertainties caused by assumptions about emission intensities.
View Article and Find Full Text PDFMultimodal transesophageal echocardiography in the surgical resection of patients with hepatocellular carcinoma and inferior vena cava tumor thrombus.
J Gastrointest Oncol
December 2024
Department of Rheumatology, Fuzhou University Affiliated Provincial Hospital, Shengli Clinical Medical College of Fujian Medical University, Fuzhou, China.
Background: The incidence and mortality rate of hepatocellular carcinoma (HCC) are increasing globally. HCC with inferior vena cava tumor thrombus (HCCIVCTT) represents an advanced stage of the disease. Research suggests that for patients with advanced HCCIVCTT, liver resection combined with thrombectomy is a safe and feasible option that can provide moderate survival benefit.
View Article and Find Full Text PDFFree space optical communication (FSOC) technology can be used for data transmission between ocean islands as backup wireless communication networks to cope with traffic surges and emergencies. In this paper, we experimentally demonstrate the results of a 24-h real-time single-wavelength 2.5-Gbps FSOC between two islands 29 km apart at a low altitude with low complexity.
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