In the paper, the primary component analysis is made using 8 seismicity parameters of earthquake frequency N (ML≥3.0), b-value, η-value, A(b)-value, Mf-value, Ac-value, C-value and D-value that reflect the character...In the paper, the primary component analysis is made using 8 seismicity parameters of earthquake frequency N (ML≥3.0), b-value, η-value, A(b)-value, Mf-value, Ac-value, C-value and D-value that reflect the characteristics of magnitude, time and space distribution of seismicity from different respects. By using the primary component analysis method, the synthesis parameter W reflecting the anomalous features of earthquake magnitude, time and space distribution can be gained. Generally, there is some relativity among the 8 parameters, but their variations are different in different periods. The earthquake prediction based on these parameters is not very well. However, the synthesis parameter W showed obvious anomalies before 13 earthquakes (MS≥5.8) occurred in North China, which indicates that the synthesis parameter W can reflect the anomalous characteristics of magnitude, time and space distribution of seismicity better. Other problems related to the conclusions drawn by the primary component analysis method are also discussed.展开更多
In this paper,an efficien formulation based on the Lagrangian method is presented to investigate the contact–impact problems of f exible multi-body systems.Generally,the penalty method and the Hertz contact law are t...In this paper,an efficien formulation based on the Lagrangian method is presented to investigate the contact–impact problems of f exible multi-body systems.Generally,the penalty method and the Hertz contact law are the most commonly used methods in engineering applications.However,these methods are highly dependent on various non-physical parameters,which have great effects on the simulation results.Moreover,a tremendous number of degrees of freedom in the contact–impact problems will influenc thenumericalefficien ysignificantl.Withtheconsideration of these two problems,a formulation combining the component mode synthesis method and the Lagrangian method is presented to investigate the contact–impact problems in fl xible multi-body system numerically.Meanwhile,the finit element meshing laws of the contact bodies will be studied preliminarily.A numerical example with experimental verificatio will certify the reliability of the presented formulationincontact–impactanalysis.Furthermore,aseries of numerical investigations explain how great the influenc of the finit element meshing has on the simulation results.Finally the limitations of the element size in different regions are summarized to satisfy both the accuracy and efficien y.展开更多
The restaurant is traditional industry of the third industry in our country. Since May 1 in this year, China＇s Restaurant Industry to implement ＂replace the business tax with value-added tax＂ policy and change to p...The restaurant is traditional industry of the third industry in our country. Since May 1 in this year, China＇s Restaurant Industry to implement ＂replace the business tax with value-added tax＂ policy and change to pay VAT. This paper analyzed the possible impact on restaurant industry after the＂ replace the business tax with value-added tax＂ based on the understanding of the tax theory of＂ replace the business tax with value-added tax＂ and the tax compliance in our country. At the same time, this paper used the statistical analysis of data on the investigation of 100 samples of the VAT cognitive degree on ＂replace the business tax with value-added tax＂, using principal component analysis method to analyze and evaluate factors on the awareness of the restaurant owner to ＂replace the business tax with value-added tax＂ tax policy. After multiple comparison made on the sample data, this paper summarized and analyzed the countermeasures of improving the pushing effect in restaurant industry ＂replace the business tax with VAT ＂.展开更多
On the basis of expounding the status quo of China's orange drought warning model research,according to the real-time monitoring data of Beibei Orangery in Chongqing City from June to August in 2010,by using facto...On the basis of expounding the status quo of China's orange drought warning model research,according to the real-time monitoring data of Beibei Orangery in Chongqing City from June to August in 2010,by using factor analysis and principal component regression,we construct the drought warning model of Beibei Orangery in Chongqing City,and we conduct test and correction on drought warning model by using MAPE principle of assessment and prediction accuracy and the real-time monitoring data of September.The results show that as for the prediction of orange drought,the model has strong credibility.If we conduct continuous dynamic monitoring on the relevant indices regarding orange drought by virtue of this model,and pay attention to the analysis of variation trend of prediction value,then it will be more practical;the warning effect,to some extent,further indicates that using factor analysis and principal component analysis method to conduct drought warning is rational;as the prediction model is static and linear,so we should perfect model to promote the accuracy and practicality of model.展开更多
基金Project of Joint Seismological Science Foundation of China (104090).
文摘In the paper, the primary component analysis is made using 8 seismicity parameters of earthquake frequency N (ML≥3.0), b-value, η-value, A(b)-value, Mf-value, Ac-value, C-value and D-value that reflect the characteristics of magnitude, time and space distribution of seismicity from different respects. By using the primary component analysis method, the synthesis parameter W reflecting the anomalous features of earthquake magnitude, time and space distribution can be gained. Generally, there is some relativity among the 8 parameters, but their variations are different in different periods. The earthquake prediction based on these parameters is not very well. However, the synthesis parameter W showed obvious anomalies before 13 earthquakes (MS≥5.8) occurred in North China, which indicates that the synthesis parameter W can reflect the anomalous characteristics of magnitude, time and space distribution of seismicity better. Other problems related to the conclusions drawn by the primary component analysis method are also discussed.
基金supported by the National Science Foundation of China (Grants 11132007,11272203)
文摘In this paper,an efficien formulation based on the Lagrangian method is presented to investigate the contact–impact problems of f exible multi-body systems.Generally,the penalty method and the Hertz contact law are the most commonly used methods in engineering applications.However,these methods are highly dependent on various non-physical parameters,which have great effects on the simulation results.Moreover,a tremendous number of degrees of freedom in the contact–impact problems will influenc thenumericalefficien ysignificantl.Withtheconsideration of these two problems,a formulation combining the component mode synthesis method and the Lagrangian method is presented to investigate the contact–impact problems in fl xible multi-body system numerically.Meanwhile,the finit element meshing laws of the contact bodies will be studied preliminarily.A numerical example with experimental verificatio will certify the reliability of the presented formulationincontact–impactanalysis.Furthermore,aseries of numerical investigations explain how great the influenc of the finit element meshing has on the simulation results.Finally the limitations of the element size in different regions are summarized to satisfy both the accuracy and efficien y.
文摘The restaurant is traditional industry of the third industry in our country. Since May 1 in this year, China＇s Restaurant Industry to implement ＂replace the business tax with value-added tax＂ policy and change to pay VAT. This paper analyzed the possible impact on restaurant industry after the＂ replace the business tax with value-added tax＂ based on the understanding of the tax theory of＂ replace the business tax with value-added tax＂ and the tax compliance in our country. At the same time, this paper used the statistical analysis of data on the investigation of 100 samples of the VAT cognitive degree on ＂replace the business tax with value-added tax＂, using principal component analysis method to analyze and evaluate factors on the awareness of the restaurant owner to ＂replace the business tax with value-added tax＂ tax policy. After multiple comparison made on the sample data, this paper summarized and analyzed the countermeasures of improving the pushing effect in restaurant industry ＂replace the business tax with VAT ＂.
文摘On the basis of expounding the status quo of China's orange drought warning model research,according to the real-time monitoring data of Beibei Orangery in Chongqing City from June to August in 2010,by using factor analysis and principal component regression,we construct the drought warning model of Beibei Orangery in Chongqing City,and we conduct test and correction on drought warning model by using MAPE principle of assessment and prediction accuracy and the real-time monitoring data of September.The results show that as for the prediction of orange drought,the model has strong credibility.If we conduct continuous dynamic monitoring on the relevant indices regarding orange drought by virtue of this model,and pay attention to the analysis of variation trend of prediction value,then it will be more practical;the warning effect,to some extent,further indicates that using factor analysis and principal component analysis method to conduct drought warning is rational;as the prediction model is static and linear,so we should perfect model to promote the accuracy and practicality of model.
