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  • Cambridge University Press (CUP)  (2)
  • 2020-2024  (2)
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  • Cambridge University Press (CUP)  (2)
Language
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  • 2020-2024  (2)
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Subjects(RVK)
  • 1
    Online Resource
    Online Resource
    Cambridge University Press (CUP) ; 2020
    In:  Epidemiology and Infection Vol. 148 ( 2020)
    In: Epidemiology and Infection, Cambridge University Press (CUP), Vol. 148 ( 2020)
    Abstract: Forecasting the epidemics of the diseases is very valuable in planning and supplying resources effectively. This study aims to estimate the epidemiological trends of the coronavirus disease 2019 (COVID-19) prevalence and mortality using the advanced α -Sutte Indicator, and its prediction accuracy level was compared with the most frequently adopted autoregressive integrated moving average (ARIMA) method. Time-series analysis was performed based on the total confirmed cases and deaths of COVID-19 in the world, Brazil, Peru, Canada and Chile between 27 February 2020 and 30 June 2020. By comparing the prediction reliability indices, including the root mean square error, mean absolute error, mean error rate, mean absolute percentage error and root mean square percentage error, the α -Sutte Indicator was found to produce lower forecasting error rates than the ARIMA model in all data apart from the prevalence testing set globally. The α -Sutte Indicator can be recommended as a useful tool to nowcast and forecast the COVID-19 prevalence and mortality of these regions except for the prevalence around the globe in the near future, which will help policymakers to plan and prepare health resources effectively. Also, the findings of our study may have managerial implications for the outbreak in other countries.
    Type of Medium: Online Resource
    ISSN: 0950-2688 , 1469-4409
    RVK:
    Language: English
    Publisher: Cambridge University Press (CUP)
    Publication Date: 2020
    detail.hit.zdb_id: 1470211-3
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  • 2
    Online Resource
    Online Resource
    Cambridge University Press (CUP) ; 2022
    In:  Journal of Fluid Mechanics Vol. 946 ( 2022-09-10)
    In: Journal of Fluid Mechanics, Cambridge University Press (CUP), Vol. 946 ( 2022-09-10)
    Abstract: The hydrodynamic mechanism of drag reduction by a flexible hairy coating was explored using the penalty immersed boundary method. A two-dimensional flexible hairy coating is constituted by multiple flexible filaments. A simulation of a cylinder without a hairy coating at a Reynolds number of 100 was also performed for comparison. The results of the simulations show good agreement with the experimental data by Niu & Hu ( Phys. Fluids , vol. 23, 2011, 101701), where maximum drag reduction of 22% was attained at a particular length, bending rigidity, coating density and coating angle of the hairy coating. The hydrodynamic mechanism of drag reduction was characterized in terms of the wake pattern, shape deformation and kinetic energy of the hairy coating. The effect of a non-uniform bending rigidity of the hairy coating on drag reduction was explored. A stable streamline shape of the hairy coating was found to delay the vortex formation and stabilize the recirculation zone, resulting in decreased form drag. Active flapping of the hairy coating with enhanced vortex shedding is adverse to drag reduction. A hairy coating with a stiff base and flexible trailing edge is beneficial to maintaining a stable shape.
    Type of Medium: Online Resource
    ISSN: 0022-1120 , 1469-7645
    Language: English
    Publisher: Cambridge University Press (CUP)
    Publication Date: 2022
    detail.hit.zdb_id: 1472346-3
    detail.hit.zdb_id: 218334-1
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