Stability analysis of existing tunnels under dynamic loads during excavation of new tunnels.

Understanding the deformation mechanism and behaviour of adjacent tunnels subjected to dynamic train loads provides vital technical insights for engineering design. This study conducted a detailed analysis and revealed that tunnel excavation significantly affects the stability of adjacent existing tunnels under dynamic loads. First, we developed a dynamic load simulation approach and derived a calculation formula for shield-soil friction.

Analysis of cultivated land degradation in southern China: diagnostics, drivers, and restoration solutions.

Introduction: Cultivated land quality degradation is a critical challenge to food security, requiring effective nature-based restoration strategies based on comprehensive assessments of land quality. However, existing methods are often costly, limited in scope, and fail to capture the multidimensional complexity of the degradation processes.

Methods: This study integrated vegetation indices, topographic data, and soil physical and chemical properties to construct a model for identifying cultivated land degradation.

Decoding xenia effects on 'Jinsha' pomelo: Insights from physiological, transcriptomics and metabolomics analyses.

'Xenia' is the terminology and biology of direct, or immediate, pollen effects on seeds and fruits. In this study, we found that the pollination of 'Jinsha' pomelo (JS) with pollen from Grapefruit (GR) and 'Majia' pomelo (MJ) led to significant differences in the seed numbers and primary metabolite (soluble sugar and amino acid). In pollinated pistils, the differences in the number of pollen tubes entering the embryo sac and the content of cytokinin components at 5 d post-pollination between the two pollen sources might be the important factor contributing to the discrepancies of seed trait and further affected fruit quality.

LIPUS Promotes Calcium Oscillation and Enhances Calcium Dependent Autophagy of Chondrocytes to Alleviate Osteoarthritis.

Osteoarthritis (OA) is a degenerative disease which places an enormous burden on society, effective treatments are still limited. As a non-invasive and safe physical therapy, low-intensity pulsed ultrasound (LIPUS) can alleviate OA progression, but the underlying mechanism is not fully understood, especially the mechanical transduction between LIPUS and the organism. In this pioneering study, the biomechanical effects of LIPUS on living mice chondrocytes and living body zebrafish are investigate by using fluorescence imaging technology, to dynamically "visualize" its invisible mechanical stimuli in the form of calcium oscillations.

OTFS Radar Waveform Design Based on Information Theory.

In this work, we consider the waveform design for radar systems based on orthogonal time-frequency space (OTFS). The conditional mutual information (CMI), chosen as a promising metric for assessing the radar cognitive capability, serves as the criterion for OTFS waveform design. After formulating the OTFS waveform design problem based on maximizing CMI, we propose an equivalent waveform processing approach by minimizing the autocorrelation sidelobes and cross-correlations (ASaCC) of the OTFS transmitting matrix.