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Sökning: WFRF:(Ma Kailong)

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1.
  • Li, Bo, et al. (författare)
  • Wind tunnel test study on influence of open/close operation on aerodynamic noise characteristics of high-speed pantographs
  • 2024
  • Ingår i: Zhongnan Daxue Xuebao (Ziran Kexue Ban)/Journal of Central South University (Science and Technology). - 1672-7207. ; 55:5, s. 1846-1854
  • Tidskriftsartikel (refereegranskat)abstract
    • Wind tunnel tests of aerodynamic noise at wind speeds from 160 km/h to 324 km/h were carried out for high speed pantograph developed by Beijing CRRC CED Co. Ltd. The effects of wind speed and open/close operation status on pantograph aerodynamic noise characteristics were analyzed, and the pantograph aerodynamic noise at higher speed was predicted. The results show that the aerodynamic noise of the pantograph and its propagation characteristics are closely related to the wind speed and operating status. The panhead and nearby areas are prone to single-tone noise due to the influence of shedding vortices. The total sound pressure energy of the far-field noise increases with the power of 5.6 − 6.0 of wind speed. The total sound pressure levels of the pantograph far-field noise in the open/closed state are predicted to be about 106.8 dB and 106.6 dB respectively at the wind speed of 400 km/h by data fitting.
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2.
  • Martínez Barrio, Álvaro, et al. (författare)
  • The genetic basis for ecological adaptation of the Atlantic herring revealed by genome sequencing
  • 2016
  • Ingår i: eLIFE. - 2050-084X. ; 5
  • Tidskriftsartikel (refereegranskat)abstract
    • Ecological adaptation is of major relevance to speciation and sustainable population management, but the underlying genetic factors are typically hard to study in natural populations due to genetic differentiation caused by natural selection being confounded with genetic drift in subdivided populations. Here, we use whole genome population sequencing of Atlantic and Baltic herring to reveal the underlying genetic architecture at an unprecedented detailed resolution for both adaptation to a new niche environment and timing of reproduction. We identify almost 500 independent loci associated with a recent niche expansion from marine (Atlantic Ocean) to brackish waters (Baltic Sea), and more than 100 independent loci showing genetic differentiation between spring- and autumn-spawning populations irrespective of geographic origin. Our results show that both coding and non-coding changes contribute to adaptation. Haplotype blocks, often spanning multiple genes and maintained by selection, are associated with genetic differentiation.
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