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Rolling of stimuli-bent cylindrical robots using contact finite element simulations.
Soft Matter
March 2025
Department of Foundational Mathematics, Xi'an Jiaotong-Liverpool University, Suzhou, 215123, China.
Curved cylinders, if rigid, cannot roll on a surface like straight cylinders, but soft cylinders bent by specific stimuli can! Studying the autonomous locomotion of these soft robots and their interactions with the environment using finite element analysis is challenging due to the complex multiphysics of stimuli-responsive soft materials and nonlinear contact mechanics. In this pioneering work, we simulate the rolling of stimuli-bent cylinders on a surface using contact finite elements and introduce a simple yet effective pseudo-thermal field method. Our approach successfully reproduces several modes of autonomous locomotion observed experimentally, including phototropic locomotion, phototropic climbing on a slanted surface, steering under partial illumination, and backward rolling under alternating heat-light stimuli.
View Article and Find Full Text PDFPM constituent exposures and maternal circulatory homocysteine in early pregnancy.
Environ Health
March 2025
Department of Family Planning, The Second Hospital of Tianjin Medical University, Tianjin, 300211, China.
Background: Elevated homocysteine (Hcy) is a pathogenic mechanism of adverse pregnancy outcomes and PM-induced cardiovascular diseases. We investigated the associations of fine particulate matter (PM) and chemical constituent exposures with maternal circulatory Hcy in early pregnancy.
Methods: Serum Hcy and 5-methyltetrahydrofolate in 324 women with pregnancy (162 normal early pregnancy [NEP] and 162 early pregnancy loss [EPL]) were measured by ultra-performance liquid chromatography-tandem triple quadrupole mass spectrometry.
Atomistic Understanding of Dislocation Climb in Nitride Semiconductors: Role of Asymmetric Jogs.
Phys Rev Lett
February 2025
State Key Laboratory of Artificial Microstructure and Mesoscopic Physics, Nano-optoelectronics Frontier Center of Ministry of Education, School of Physics, Peking University, Beijing 100871, People's Republic of China.
Effective control of dislocation climb is of fundamental interest and practical importance in tuning the mechanical and electronic properties of semiconductors. However, it remains a big challenge due to the lack of a clear understanding of its inherent mechanism, in particular, in the nitride semiconductors. In this Letter, the atomic-scale climb process of a single dislocation in GaN is observed for the first time, which undergoes an alternating five- and nine-atomic-ring transformation.
View Article and Find Full Text PDFMultimodal deep learning: tumor and visceral fat impact on colorectal cancer occult peritoneal metastasis.
Eur Radiol
February 2025
Department of Internal Medicine, Harbin Medical University Cancer Hospital, Harbin Medical University, Harbin, China.
Objectives: This study proposes a multimodal deep learning (DL) approach to investigate the impact of tumors and visceral fat on occult peritoneal metastasis in colorectal cancer (CRC) patients.
Methods: We developed a DL model named Multi-scale Feature Fusion Network (MSFF-Net) based on ResNet18, which extracted features of tumors and visceral fat from the longest diameter tumor section and the third lumbar vertebra level (L3) in preoperative CT scans of CRC patients. Logistic regression analysis was applied to patients' clinical data that integrated with DL features.
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