Under-fitting problems usually occur in regression models for dam safety monitoring.To overcome the local convergence of the regression, a genetic algorithm (GA) was proposed using a real parameter coding, a ranking s...Under-fitting problems usually occur in regression models for dam safety monitoring.To overcome the local convergence of the regression, a genetic algorithm (GA) was proposed using a real parameter coding, a ranking selection operator, an arithmetical crossover operator and a uniform mutation operator, and calculated the least-square error of the observed and computed values as its fitness function. The elitist strategy was used to improve the speed of the convergence. After that, the modified genetic algorithm was applied to reassess the coefficients of the regression model and a genetic regression model was set up. As an example, a slotted gravity dam in the Northeast of China was introduced. The computational results show that the genetic regression model can solve the under-fitting problems perfectly.展开更多
In context of building beautiful countryside nationwide, underdeveloped areas are confronted by many problems, such as monotonous industry structure, simi- lar rural landscape and loss of characteristics. With a case ...In context of building beautiful countryside nationwide, underdeveloped areas are confronted by many problems, such as monotonous industry structure, simi- lar rural landscape and loss of characteristics. With a case of Jiangjia Village, Jishui County, Jiangxi Province, the research explored rural pattern, cultural characteristics, building style, development value and potential and analyzed regional cooperation, urban-rural integration, and planning first, from the perspectives of economy, culture and building in order to protect traditional economy and highlight local characteristics.展开更多
Eco-township is of great significance for constructing beautiful countryside and accomplishing regional coordinated development between rural and urban areas to protect and improve environment in towns and villages in...Eco-township is of great significance for constructing beautiful countryside and accomplishing regional coordinated development between rural and urban areas to protect and improve environment in towns and villages in accordance with Envi- ronment Planning and Guidance of Townlets. The research took national eco-town- ship in Luoshi Town, Xinluo County, Jiangxi Province as an example and analyzed major environmental problems and causes by collecting natural, social and environ- ment information, from the perspectives of surveying on pollution source and envi- ronment quality. Finally, the research conducted regionalization of environment func- tion zones, determined environment quality protection objectives, and formulated en- vironment protection countermeasures, providing references for eco-township develop- ment in underdeveloped areas.展开更多
Aim To find an effective and fast algorithm to analyze undersampled signals. Methods\ The advantage of high order ambiguity function(HAF) algorithm is that it can analyze polynomial phase signals by phase rank reduct...Aim To find an effective and fast algorithm to analyze undersampled signals. Methods\ The advantage of high order ambiguity function(HAF) algorithm is that it can analyze polynomial phase signals by phase rank reduction. In this paper, it was first used to analyze the parameters of undersampled signals. When some conditions are satisfied, the problem of frequency confusion can be solved. Results and Conclusion\ As an example, we analyze undersampled linear frequency modulated signal. The simulation results verify the effectiveness of HAF algorithm. Compared with time frequency distribution, HAF algorithm reduces computation burden to a great extent, needs weak boundary conditions and doesn't have boundary effect.展开更多
Traditional formation pressure prediction methods all are based on the formation undercompaction mechanism and the prediction results are obviously low when predicting abnormally high pressure caused by compressional ...Traditional formation pressure prediction methods all are based on the formation undercompaction mechanism and the prediction results are obviously low when predicting abnormally high pressure caused by compressional structure overpressure.To eliminate this problem,we propose a new formation pressure prediction method considering compressional structure overpressure as the dominant factor causing abnormally high pressure.First,we establish a model for predicting maximum principal stress,this virtual maximum principal stress is calculated by a double stress field analysis.Then we predict the formation pressure by fitting the maximum principal stress with formation pressure. The real maximum principal stress can be determined by caculating the sum of the virtual maximum principal stresses.Practical application to real data from the A1 and A2 wells in the A gas field shows that this new method has higher accuracy than the traditional equivalent depth method.展开更多
Small towns are important carriers of rural economy development, and center promoting rural advancement in a specific region. However, many environ- mental problems are emerging with rapid urbanization and expansion o...Small towns are important carriers of rural economy development, and center promoting rural advancement in a specific region. However, many environ- mental problems are emerging with rapid urbanization and expansion of small town scale. The research analyzed existing problems of small town planning and con- struction domestically in the context of the 18th Party Congress and proposed coun- termeasures in terms of scale prediction, intensive use of lands, ＂pastoral＂ land- scape pattern, protection and up-gradation of human ecology with a case study of Shuinan Town, Jishui County, Jiangxi Province.展开更多
Four methods, including voltammetric measurement of double layer capacitance, surface oxides reduction, under potential deposition of Cu and carbon monoxide （CO） stripping have been applied to evaluate the real surf...Four methods, including voltammetric measurement of double layer capacitance, surface oxides reduction, under potential deposition of Cu and carbon monoxide （CO） stripping have been applied to evaluate the real surface area of a polycrystalline Pd （pc-Pd） electrode. The results reveal that the second and third methods lead to consistent results with deviations below 5%. And from the determined double layer capacitance and CO stripping charge, it is deduced that the double layer capacity unit area is 23.1±0.4μF/cm2 and the saturated CO adlayer should be ca. 0.66 ML in order to ensure that the real surface area as determined is consistent with the other two techniques. The applicability as well as the attentions when applying these techniques for the determination of the real surface area of pc-Pd electrodes have been discussed.展开更多
文摘Under-fitting problems usually occur in regression models for dam safety monitoring.To overcome the local convergence of the regression, a genetic algorithm (GA) was proposed using a real parameter coding, a ranking selection operator, an arithmetical crossover operator and a uniform mutation operator, and calculated the least-square error of the observed and computed values as its fitness function. The elitist strategy was used to improve the speed of the convergence. After that, the modified genetic algorithm was applied to reassess the coefficients of the regression model and a genetic regression model was set up. As an example, a slotted gravity dam in the Northeast of China was introduced. The computational results show that the genetic regression model can solve the under-fitting problems perfectly.
基金Supported by Jiangxi Social Science Program during the 12th Five-year Plan(14SH05)Jiangxi Social Science University Humanity(JC1434)Jiangxi Art Science Planning Program(YG2014113)~~
文摘In context of building beautiful countryside nationwide, underdeveloped areas are confronted by many problems, such as monotonous industry structure, simi- lar rural landscape and loss of characteristics. With a case of Jiangjia Village, Jishui County, Jiangxi Province, the research explored rural pattern, cultural characteristics, building style, development value and potential and analyzed regional cooperation, urban-rural integration, and planning first, from the perspectives of economy, culture and building in order to protect traditional economy and highlight local characteristics.
基金Supported by Humanities and Social Sciences of Jiangxi General Colleges and Universities(JC1434)"Twelfth Five-year Plan"of Jiangxi Provincial Social Sciences Program(14SH05)Jiangxi Art Science Planning Program(YG2014113)~~
文摘Eco-township is of great significance for constructing beautiful countryside and accomplishing regional coordinated development between rural and urban areas to protect and improve environment in towns and villages in accordance with Envi- ronment Planning and Guidance of Townlets. The research took national eco-town- ship in Luoshi Town, Xinluo County, Jiangxi Province as an example and analyzed major environmental problems and causes by collecting natural, social and environ- ment information, from the perspectives of surveying on pollution source and envi- ronment quality. Finally, the research conducted regionalization of environment func- tion zones, determined environment quality protection objectives, and formulated en- vironment protection countermeasures, providing references for eco-township develop- ment in underdeveloped areas.
文摘Aim To find an effective and fast algorithm to analyze undersampled signals. Methods\ The advantage of high order ambiguity function(HAF) algorithm is that it can analyze polynomial phase signals by phase rank reduction. In this paper, it was first used to analyze the parameters of undersampled signals. When some conditions are satisfied, the problem of frequency confusion can be solved. Results and Conclusion\ As an example, we analyze undersampled linear frequency modulated signal. The simulation results verify the effectiveness of HAF algorithm. Compared with time frequency distribution, HAF algorithm reduces computation burden to a great extent, needs weak boundary conditions and doesn't have boundary effect.
基金a grant from the National Key Technologies R & D Program of China during the 9th Five-Year Plan Period(Grant No.9911010102).
文摘Traditional formation pressure prediction methods all are based on the formation undercompaction mechanism and the prediction results are obviously low when predicting abnormally high pressure caused by compressional structure overpressure.To eliminate this problem,we propose a new formation pressure prediction method considering compressional structure overpressure as the dominant factor causing abnormally high pressure.First,we establish a model for predicting maximum principal stress,this virtual maximum principal stress is calculated by a double stress field analysis.Then we predict the formation pressure by fitting the maximum principal stress with formation pressure. The real maximum principal stress can be determined by caculating the sum of the virtual maximum principal stresses.Practical application to real data from the A1 and A2 wells in the A gas field shows that this new method has higher accuracy than the traditional equivalent depth method.
基金Supported by Jiangxi Social Science Program during the 12~(th) Five-year Plan(14SH05)Jiangxi Social Science University Humanity(JC1434)Jiangxi Art Science Planning Program(YG2014113)
文摘Small towns are important carriers of rural economy development, and center promoting rural advancement in a specific region. However, many environ- mental problems are emerging with rapid urbanization and expansion of small town scale. The research analyzed existing problems of small town planning and con- struction domestically in the context of the 18th Party Congress and proposed coun- termeasures in terms of scale prediction, intensive use of lands, ＂pastoral＂ land- scape pattern, protection and up-gradation of human ecology with a case study of Shuinan Town, Jishui County, Jiangxi Province.
文摘Four methods, including voltammetric measurement of double layer capacitance, surface oxides reduction, under potential deposition of Cu and carbon monoxide （CO） stripping have been applied to evaluate the real surface area of a polycrystalline Pd （pc-Pd） electrode. The results reveal that the second and third methods lead to consistent results with deviations below 5%. And from the determined double layer capacitance and CO stripping charge, it is deduced that the double layer capacity unit area is 23.1±0.4μF/cm2 and the saturated CO adlayer should be ca. 0.66 ML in order to ensure that the real surface area as determined is consistent with the other two techniques. The applicability as well as the attentions when applying these techniques for the determination of the real surface area of pc-Pd electrodes have been discussed.
