A novel damage detection method is applied to a 3-story frame structure, to obtain statistical quantification control criterion of the existence, location and identification of damage. The mean, standard deviation, an...A novel damage detection method is applied to a 3-story frame structure, to obtain statistical quantification control criterion of the existence, location and identification of damage. The mean, standard deviation, and exponentially weighted moving average （EWMA） are applied to detect damage information according to statistical process control （SPC） theory. It is concluded that the detection is insignificant with the mean and EWMA because the structural response is not independent and is not a normal distribution. On the other hand, the damage information is detected well with the standard deviation because the influence of the data distribution is not pronounced with this parameter. A suitable moderate confidence level is explored for more significant damage location and quantification detection, and the impact of noise is investigated to illustrate the robustness of the method.展开更多
Spheroidiser is an important middle alloy for producing ductile iron. Now only chemicalcompositions of spheroidiser was presented by producers in detail. It is just reflecting reactive thermodynamic factors of spheroi...Spheroidiser is an important middle alloy for producing ductile iron. Now only chemicalcompositions of spheroidiser was presented by producers in detail. It is just reflecting reactive thermodynamic factors of spheroidiser in melt. But some reactive kinetic factors of spheroidiser in melted iron and its quality stability in melting are not paid attention enough. According to reactive thermodynamics and kinetics of spheroidiser in melt and stability of quality of manufactured spheroidisers during application by statistics. This paper presents evaluated standards for quality of spheroidisers by pyrogenic production under atmosphere fully.展开更多
Traffic tunnels include tunnel works for traffic and transport in the areas of railway, highway, and rail transit. With many mountains and nearly one fifth of the global population, China possesses numerous large citi...Traffic tunnels include tunnel works for traffic and transport in the areas of railway, highway, and rail transit. With many mountains and nearly one fifth of the global population, China possesses numerous large cities and megapolises with rapidly growing economies and huge traffic demands. As a result, a great deal of railway, highway, and rail transit facilities are required in this country. In the past, the construction of these facilities mainly involved subgrade and bridge works; in recent years.展开更多
顺序统计量在非参数统计分析中有着广泛的应用,嵌套顺序统计量的分布则依赖于具体的嵌套结构以及随机变量的分布特性.在研究三段式嵌套顺序统计量的分布时,可以将问题转化为嵌套积分,通过对相应的嵌套单形进行多重积分得到三段式嵌套顺...顺序统计量在非参数统计分析中有着广泛的应用,嵌套顺序统计量的分布则依赖于具体的嵌套结构以及随机变量的分布特性.在研究三段式嵌套顺序统计量的分布时,可以将问题转化为嵌套积分,通过对相应的嵌套单形进行多重积分得到三段式嵌套顺序统计量的分布.这种分析方法的应用十分广泛,由于Standard Young Tableaux (SYT)的每一行对应一组独立的顺序统计量,因此文章将其应用于SYT的计数问题.此外,文章还将三段式嵌套顺序统计量的分布应用于选票问题.展开更多
[Objectives]To evaluate the quality of Cardamine macrophylla Willd as Tibetan and Qiang medicinal materials,so as to improve its quality standard and evaluate the quality of C.macrophylla Willd in western Sichuan Prov...[Objectives]To evaluate the quality of Cardamine macrophylla Willd as Tibetan and Qiang medicinal materials,so as to improve its quality standard and evaluate the quality of C.macrophylla Willd in western Sichuan Province.[Methods]C.macrophylla Willd produced from western Sichuan Province was used as the sample,and the contents of moisture,total ash,acid-insoluble ash,extract,total flavonoids and quercetin in the ground part of C.macrophylla Willd were determined in accordance with the methods of Chinese Pharmacopoeia(2020 edition).With the above seven indicators as evaluation indicators,the quality of medicinal materials was comprehensively evaluated by cluster analysis and principal component analysis(PCA).[Results]According to the results of each indicator,the moisture content of C.macrophylla Willd sample should not exceed 11.00%,the total ash content should not exceed 18%,the acid-insoluble ash content should not exceed 6%,the extract content should not be less than 19%,the total flavone content(calculated by quercetin)should not be less than 2%,and the quercetin content should not be less than 0.15%.[Conclusions]The sample S7 has the best quality and S6 has the worst quality.In this study,the quantitative analysis method of total flavonoids(quercetin)and quercetin in C.macrophylla Willd was established,and the limits of each indicator were preliminarily formulated.展开更多
基金Natural Natural Science Foundation of China Under Grant No 50778077 & 50608036the Graduate Innovation Fund of Huazhong University of Science and Technology Under Grant No HF-06-028
文摘A novel damage detection method is applied to a 3-story frame structure, to obtain statistical quantification control criterion of the existence, location and identification of damage. The mean, standard deviation, and exponentially weighted moving average （EWMA） are applied to detect damage information according to statistical process control （SPC） theory. It is concluded that the detection is insignificant with the mean and EWMA because the structural response is not independent and is not a normal distribution. On the other hand, the damage information is detected well with the standard deviation because the influence of the data distribution is not pronounced with this parameter. A suitable moderate confidence level is explored for more significant damage location and quantification detection, and the impact of noise is investigated to illustrate the robustness of the method.
文摘Spheroidiser is an important middle alloy for producing ductile iron. Now only chemicalcompositions of spheroidiser was presented by producers in detail. It is just reflecting reactive thermodynamic factors of spheroidiser in melt. But some reactive kinetic factors of spheroidiser in melted iron and its quality stability in melting are not paid attention enough. According to reactive thermodynamics and kinetics of spheroidiser in melt and stability of quality of manufactured spheroidisers during application by statistics. This paper presents evaluated standards for quality of spheroidisers by pyrogenic production under atmosphere fully.
文摘Traffic tunnels include tunnel works for traffic and transport in the areas of railway, highway, and rail transit. With many mountains and nearly one fifth of the global population, China possesses numerous large cities and megapolises with rapidly growing economies and huge traffic demands. As a result, a great deal of railway, highway, and rail transit facilities are required in this country. In the past, the construction of these facilities mainly involved subgrade and bridge works; in recent years.
文摘顺序统计量在非参数统计分析中有着广泛的应用,嵌套顺序统计量的分布则依赖于具体的嵌套结构以及随机变量的分布特性.在研究三段式嵌套顺序统计量的分布时,可以将问题转化为嵌套积分,通过对相应的嵌套单形进行多重积分得到三段式嵌套顺序统计量的分布.这种分析方法的应用十分广泛,由于Standard Young Tableaux (SYT)的每一行对应一组独立的顺序统计量,因此文章将其应用于SYT的计数问题.此外,文章还将三段式嵌套顺序统计量的分布应用于选票问题.
基金Supported by Scientific Research Project for School-level Teachers of Sichuan College of Traditional Chinese Medicine in 2023 (23ZRYB08)Tibetan Plateau Ethnic Medicinal Resources Protection and Utilization Key Laboratory Open Fund Project of Southwest Minzu University (QTPEM2305).
文摘[Objectives]To evaluate the quality of Cardamine macrophylla Willd as Tibetan and Qiang medicinal materials,so as to improve its quality standard and evaluate the quality of C.macrophylla Willd in western Sichuan Province.[Methods]C.macrophylla Willd produced from western Sichuan Province was used as the sample,and the contents of moisture,total ash,acid-insoluble ash,extract,total flavonoids and quercetin in the ground part of C.macrophylla Willd were determined in accordance with the methods of Chinese Pharmacopoeia(2020 edition).With the above seven indicators as evaluation indicators,the quality of medicinal materials was comprehensively evaluated by cluster analysis and principal component analysis(PCA).[Results]According to the results of each indicator,the moisture content of C.macrophylla Willd sample should not exceed 11.00%,the total ash content should not exceed 18%,the acid-insoluble ash content should not exceed 6%,the extract content should not be less than 19%,the total flavone content(calculated by quercetin)should not be less than 2%,and the quercetin content should not be less than 0.15%.[Conclusions]The sample S7 has the best quality and S6 has the worst quality.In this study,the quantitative analysis method of total flavonoids(quercetin)and quercetin in C.macrophylla Willd was established,and the limits of each indicator were preliminarily formulated.
