该文介绍了一种基于并行测试完成时间极限定理分析和设计的TS-TL(task scheduler based on UUTs model and limit theorem of parallel test finish time)算法。该算法运用极限定理确定了并行测试方法的最短时间,与传统意义上的串行测试...该文介绍了一种基于并行测试完成时间极限定理分析和设计的TS-TL(task scheduler based on UUTs model and limit theorem of parallel test finish time)算法。该算法运用极限定理确定了并行测试方法的最短时间,与传统意义上的串行测试和TS-T算法相比,有效缩短了测试时间,提高了测试效率,为实际测量提供了完整的理论依据。展开更多
Asphalt binders play a crucial role in the fatigue cracking resistance of asphalt pavement,making the characterization of their fatigue life increasingly important.To evaluate the fatigue life of asphalt binders,two t...Asphalt binders play a crucial role in the fatigue cracking resistance of asphalt pavement,making the characterization of their fatigue life increasingly important.To evaluate the fatigue life of asphalt binders,two tests have been developed:the time sweep(TS)and the linear amplitude sweep(LAS),both conducted using the dynamic shear rheometer(DSR).Similar to asphalt mixtures,predicting the fatigue life of asphalt binders necessitates the predefinition of fatigue failure criterion and/or fatigue failure definition(failure point).Phenomenological and dissipated energy-based failure criteria are commonly employed to analyze TS test results,while the viscoelastic continuum damage(VECD)model is primarily used to predict fatigue life through the LAS test.Given that the fatigue test temperature significantly impacts the fatigue life of asphalt binders,various methods have been proposed in the literature for selecting the fatigue test temperature.This paper provides a comprehensive review of the fatigue life evaluation of asphalt binders using both TS and LAS tests.It summarizes the different fatigue failure criteria and fatigue failure definitions employed and discusses the selection of fatigue test temperatures.Furthermore,the paper examines the influence of fatigue test conditions,binder chemical composition and/or penetration grade,and bitumen modification on the fatigue life of asphalt binders.Based on the current review,it is recommended to utilize the LAS test on PAV-aged bitumen under strain-controlled conditions to evaluate the fatigue life of asphalt binders.The most relevant failure definition is the peak in stored pseudo-strain energy based on the simplified viscoelastic continuum damage model(S-VECD).Additionally, the authors propose conducting the fatigue test at an intermediate referencetemperature for each country or region, depending on its climate zone.展开更多
利用2005-2015年安徽省内1162个站点观测资料简要分析了短时强降水的时空分布特征,并利用中国气象局CLDAS(CMA Land Data Assimilation System)近实时降水资料检验2012-2015年安徽省WRF(Weather Research and Forecast)模式对短时强降...利用2005-2015年安徽省内1162个站点观测资料简要分析了短时强降水的时空分布特征,并利用中国气象局CLDAS(CMA Land Data Assimilation System)近实时降水资料检验2012-2015年安徽省WRF(Weather Research and Forecast)模式对短时强降水的预报性能,探讨不同空间插值方法、检验方法对预报效果的影响,以评估模式预报短时强降水的应用价值和使用注意事项。结果表明:短时强降水主要发生在大别山区和皖南山区;一年中发生次数呈单峰分布,集中于6-8月;日变化呈双峰状,强峰为北京时间下午15:00-19:00,弱峰为06:00-09:00,两个低谷分别为01:00、12:00前后。在两分类评分TS(Threat Score)检验中,各个季节评分均十分低,插值方法对TS评分影响不大。邻域法FSS评分(Fractions Skill Score)检验中,春季FSS评分低,最高仅可达15%,空间窗、时间窗、时间超前或滞后变化对FSS评分的影响不如夏季、秋季明显;夏季,不考虑时间窗时,单独的时间超前或滞后不能提高预报准确率;秋季,模式分别滞后1h或滞后2h预报结果优于同期预报,而超前1h或超前2h预报结果低于同期预报,表明秋季WRF模式对短时强降水的预报有一定滞后性。展开更多
介绍一种基于并行测试完成时间极限定理分析和设计的TS-TL（task scheduler based on UUTs model and limit theorem of parallel test finish time）算法。该算法运用极限定理确定了并行完成所有任务的最短时间，与传统的串行测试和TS-...介绍一种基于并行测试完成时间极限定理分析和设计的TS-TL（task scheduler based on UUTs model and limit theorem of parallel test finish time）算法。该算法运用极限定理确定了并行完成所有任务的最短时间，与传统的串行测试和TS-T算法相比，有效缩短了测试时间，提高了测试效率，为实际测量过程提供了理论依据。展开更多
文摘该文介绍了一种基于并行测试完成时间极限定理分析和设计的TS-TL(task scheduler based on UUTs model and limit theorem of parallel test finish time)算法。该算法运用极限定理确定了并行测试方法的最短时间,与传统意义上的串行测试和TS-T算法相比,有效缩短了测试时间,提高了测试效率,为实际测量提供了完整的理论依据。
文摘Asphalt binders play a crucial role in the fatigue cracking resistance of asphalt pavement,making the characterization of their fatigue life increasingly important.To evaluate the fatigue life of asphalt binders,two tests have been developed:the time sweep(TS)and the linear amplitude sweep(LAS),both conducted using the dynamic shear rheometer(DSR).Similar to asphalt mixtures,predicting the fatigue life of asphalt binders necessitates the predefinition of fatigue failure criterion and/or fatigue failure definition(failure point).Phenomenological and dissipated energy-based failure criteria are commonly employed to analyze TS test results,while the viscoelastic continuum damage(VECD)model is primarily used to predict fatigue life through the LAS test.Given that the fatigue test temperature significantly impacts the fatigue life of asphalt binders,various methods have been proposed in the literature for selecting the fatigue test temperature.This paper provides a comprehensive review of the fatigue life evaluation of asphalt binders using both TS and LAS tests.It summarizes the different fatigue failure criteria and fatigue failure definitions employed and discusses the selection of fatigue test temperatures.Furthermore,the paper examines the influence of fatigue test conditions,binder chemical composition and/or penetration grade,and bitumen modification on the fatigue life of asphalt binders.Based on the current review,it is recommended to utilize the LAS test on PAV-aged bitumen under strain-controlled conditions to evaluate the fatigue life of asphalt binders.The most relevant failure definition is the peak in stored pseudo-strain energy based on the simplified viscoelastic continuum damage model(S-VECD).Additionally, the authors propose conducting the fatigue test at an intermediate referencetemperature for each country or region, depending on its climate zone.
文摘利用2005-2015年安徽省内1162个站点观测资料简要分析了短时强降水的时空分布特征,并利用中国气象局CLDAS(CMA Land Data Assimilation System)近实时降水资料检验2012-2015年安徽省WRF(Weather Research and Forecast)模式对短时强降水的预报性能,探讨不同空间插值方法、检验方法对预报效果的影响,以评估模式预报短时强降水的应用价值和使用注意事项。结果表明:短时强降水主要发生在大别山区和皖南山区;一年中发生次数呈单峰分布,集中于6-8月;日变化呈双峰状,强峰为北京时间下午15:00-19:00,弱峰为06:00-09:00,两个低谷分别为01:00、12:00前后。在两分类评分TS(Threat Score)检验中,各个季节评分均十分低,插值方法对TS评分影响不大。邻域法FSS评分(Fractions Skill Score)检验中,春季FSS评分低,最高仅可达15%,空间窗、时间窗、时间超前或滞后变化对FSS评分的影响不如夏季、秋季明显;夏季,不考虑时间窗时,单独的时间超前或滞后不能提高预报准确率;秋季,模式分别滞后1h或滞后2h预报结果优于同期预报,而超前1h或超前2h预报结果低于同期预报,表明秋季WRF模式对短时强降水的预报有一定滞后性。
文摘介绍一种基于并行测试完成时间极限定理分析和设计的TS-TL（task scheduler based on UUTs model and limit theorem of parallel test finish time）算法。该算法运用极限定理确定了并行完成所有任务的最短时间，与传统的串行测试和TS-T算法相比，有效缩短了测试时间，提高了测试效率，为实际测量过程提供了理论依据。
