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2 results

  • 13 - Data Assimilation for Real-Time Shake-Mapping and Prediction of Ground Shaking in Earthquake Early Warning

  • from Part III - ‘Solid’ Earth Applications: From the Surface to the Core
  • Edited by Alik Ismail-Zadeh, Karlsruhe Institute of Technology, Germany, Fabio Castelli, Università degli Studi, Florence, Dylan Jones, University of Toronto, Sabrina Sanchez, Max Planck Institute for Solar System Research, Germany
  • Book:
    Applications of Data Assimilation and Inverse Problems in the Earth Sciences
    Published online:
    20 June 2023
    Print publication:
    06 July 2023, pp 209-219

  • Summary

    Abstract: Earthquake early warning (EEW) systems aim to provide advance warning of impending strong ground shaking, in which earthquake ground shaking is predicted in real-time or near real-time. Many EEW systems are based on a strategy which first quickly determines the earthquake hypocentre and magnitude, and then predicts the strength of ground shaking at various locations using the hypocentre distance and magnitude. Recently, however, a new strategy was proposed in which the current seismic wavefield is rapidly estimated by using data assimilation, and then the future wavefield is predicted on the basis of the physics of wave propagation. This technique for real-time prediction of ground shaking in EEW does not necessarily require the earthquake hypocentre and magnitude. In this paper, I review real-time shake-mapping and data assimilation for precise estimation of ongoing ground shaking, and prediction of future shaking in EEW.

  • Improved mechanical properties of 3D-printed SiC/PLA composite parts by microwave heating

  • Yanqing Wang, Zengguang Liu, Huwei Gu, Chunzhi Cui, Jingbin Hao
  • Journal:
    Journal of Materials Research / Volume 34 / Issue 20 / 28 October 2019
    Published online by Cambridge University Press:
    09 October 2019, pp. 3412-3419
    Print publication:
    28 October 2019

  • Polylactic acid (PLA) filament 3D parts printed by fused deposition modeling (FDM) have poor mechanical properties because of weak fusion interfaces. This article shows that SiC-coated PLA filaments are effective means to increase mechanical performance of PLA composites that are microwave heated. Numerical calculations on temperature-rising characteristics and temperature distribution of the interface in the microwave field are shown. 3D-printed specimens of PLA/SiC composites were printed by FDM and heated in a microwave. The experiments show the SiC/PLA composite filaments have better temperature-rising characteristics and temperature distribution at 185 °C for 60 s in the microwave field, and this enabled the 3D-printed specimens to achieve in situ remelting on the interface and increased interface bonding between PLA filaments. The SiC/PLA composite specimens heated using microwave increased by 51% in tensile strength, 42% in tensile modulus, and 18.7% in interlayer breaking stress relative to PLA. These results provided a new approach for the improvement of FDM workpiece strength.