为了预测在役油气管道腐蚀剩余寿命,基于广义极值(Generalized Extreme Value ,GEV)自适应优选分布研究,建立了基于改进GEV分布的腐蚀油气管道剩余寿命预测模型。首先,利用马尔科夫链蒙特卡罗(Markov Chain Monte Carlo, MCMC)方法估计...为了预测在役油气管道腐蚀剩余寿命,基于广义极值(Generalized Extreme Value ,GEV)自适应优选分布研究,建立了基于改进GEV分布的腐蚀油气管道剩余寿命预测模型。首先,利用马尔科夫链蒙特卡罗(Markov Chain Monte Carlo, MCMC)方法估计GEV分布函数的参数并由此确定极值分布类型,若图形检验合理,则采用该分布预测其最大腐蚀深度;其次,基于管道的可靠度及安全性建立腐蚀裕量预测模型;最后,根据管道最大腐蚀深度、腐蚀裕量及管道使用年限等数据,建立三者关系指数模型,以此预测管道剩余寿命。以中国某油气管道为研究对象,利用新建模型对管道剩余寿命进行预测,结果表明:模型的预测精度较高且不受限于数据的具体分布,作为管道剩余寿命的预测模型通用性较好。展开更多
Previously the 5D homogeneous space-time metric was introduced with explicitly given projection operators in matrix form which map the 5D space-time manifold into a Lorentzian space-time. Based on this projection mode...Previously the 5D homogeneous space-time metric was introduced with explicitly given projection operators in matrix form which map the 5D space-time manifold into a Lorentzian space-time. Based on this projection model, vector field and spinor solutions are found to be expressible in terms of SU(2)xL and SU(3)xL, where L is the 4D Lorentz space-time group. The spinor solutions give the SU(2) leptonic states arising from space-time projection, whereas the SU(3) representation arises from conformal projection and gives the quarks, and due to gauge requirement leads to mesons and baryons. This process of mapping the 5D space-time manifold into the 4D space-time is at the basis of an analysis of the recent CERN experimental results, the presence of neutrino oscillations and the observed 125 GeV resonance in the p-p collisions, respectively. In fact, it is found that the spinor solution contains an oscillating phase, and the 125 GeV resonance is shown to be predictable, thereby 1) eliminating the need to introduce a Higgs vacuum, and 2) can be shown possibly to be an indicator for a missing heavy baryon octet.展开更多
The dependence of transverse polarization on rapidity ofΛproduced in S+Pb collisions at 200 GeV/c per nucleon has been studied.The original experimental data are from NA36 Collaboration at SPS of CERN.The precession ...The dependence of transverse polarization on rapidity ofΛproduced in S+Pb collisions at 200 GeV/c per nucleon has been studied.The original experimental data are from NA36 Collaboration at SPS of CERN.The precession effect ofΛspin,owing to the interactions between spin moment ofΛand the magnetic field on the path whichΛpasses through,on the polarization has been taken into account.The results show that there are slight differences for the transverse polarization in different rapidity-region.The origins for these results have been analysed and discussed.展开更多
The ∧^(0) polarization is analyzed with the experinental data in S+Pb collisions at energy 200GeV per nucleon,which were produced at SPS of CERN.The snall.polarization rxalue and thecorrelation betrween the transvers...The ∧^(0) polarization is analyzed with the experinental data in S+Pb collisions at energy 200GeV per nucleon,which were produced at SPS of CERN.The snall.polarization rxalue and thecorrelation betrween the transverse polarization and transverse momentum were obtained in Feyn-man parameter x_(F)>0,r_(F)<0 and all xp.The results show that the non-polarization of lamb-da appears in the vegion of larger transterse momenta,say,at 1-2 GeV/c in P_(T).The originsof polarization reduction are discussed.展开更多
The pseudorapidity and azimuthal angle distributions for charged particle produced in pp collisions at 400 GeV/c have been measured by using the LEBC films offered by CERN NA27 collaboration.The split-bin correlation ...The pseudorapidity and azimuthal angle distributions for charged particle produced in pp collisions at 400 GeV/c have been measured by using the LEBC films offered by CERN NA27 collaboration.The split-bin correlation functions have been calculated.The results show that the correlations are produced by resonance-like processces.展开更多
Very receat measurements of π+p and K+p elastic seattering at 250GeV/c have been explained by using the generalised Chou-Yang model.Dips are predicted to occur at-t=3.63 and 4.36(GeV/c)^(2) respectively。
The multiplicity fluctuations of charged particles produced in pp collisions at 400 GeV/c have been studied by means of the bunching parameters(BPs).The results show that the values of BPsŋ2(M)andŋ3(M)depend not only ...The multiplicity fluctuations of charged particles produced in pp collisions at 400 GeV/c have been studied by means of the bunching parameters(BPs).The results show that the values of BPsŋ2(M)andŋ3(M)depend not only on the width of multiplicity distribution,but also on the phase space correlations.The BPs:ŋ2(M)andŋ3(M)follow the same power-law behavior,which indicates that the multifractal structure in pp collisions at 400 GeV/c is observed.展开更多
The stationarity hypothesis is essential in hydrological frequency analysis and statistical inference. This assumption is often not fulfilled for large observed datasets, especially in the case of hydro-climatic varia...The stationarity hypothesis is essential in hydrological frequency analysis and statistical inference. This assumption is often not fulfilled for large observed datasets, especially in the case of hydro-climatic variables. The Generalized Extreme Value distribution with covariates allows to model data in the presence of non-stationarity and/or dependence on covariates. Linear and non-linear dependence structures have been proposed with the corresponding fitting approach. The objective of the present study is to develop the GEV model with B-Spline in a Bayesian framework. A Markov Chain Monte Carlo (MCMC) algorithm has been developed to estimate quantiles and their posterior distributions. The methods are tested and illustrated using simulated data and applied to meteorological data. Results indicate the better performance of the proposed Bayesian method for rainfall quantile estimation according to BIAS and RMSE criteria especially for high return period events.展开更多
文摘为了预测在役油气管道腐蚀剩余寿命,基于广义极值(Generalized Extreme Value ,GEV)自适应优选分布研究,建立了基于改进GEV分布的腐蚀油气管道剩余寿命预测模型。首先,利用马尔科夫链蒙特卡罗(Markov Chain Monte Carlo, MCMC)方法估计GEV分布函数的参数并由此确定极值分布类型,若图形检验合理,则采用该分布预测其最大腐蚀深度;其次,基于管道的可靠度及安全性建立腐蚀裕量预测模型;最后,根据管道最大腐蚀深度、腐蚀裕量及管道使用年限等数据,建立三者关系指数模型,以此预测管道剩余寿命。以中国某油气管道为研究对象,利用新建模型对管道剩余寿命进行预测,结果表明:模型的预测精度较高且不受限于数据的具体分布,作为管道剩余寿命的预测模型通用性较好。
文摘Previously the 5D homogeneous space-time metric was introduced with explicitly given projection operators in matrix form which map the 5D space-time manifold into a Lorentzian space-time. Based on this projection model, vector field and spinor solutions are found to be expressible in terms of SU(2)xL and SU(3)xL, where L is the 4D Lorentz space-time group. The spinor solutions give the SU(2) leptonic states arising from space-time projection, whereas the SU(3) representation arises from conformal projection and gives the quarks, and due to gauge requirement leads to mesons and baryons. This process of mapping the 5D space-time manifold into the 4D space-time is at the basis of an analysis of the recent CERN experimental results, the presence of neutrino oscillations and the observed 125 GeV resonance in the p-p collisions, respectively. In fact, it is found that the spinor solution contains an oscillating phase, and the 125 GeV resonance is shown to be predictable, thereby 1) eliminating the need to introduce a Higgs vacuum, and 2) can be shown possibly to be an indicator for a missing heavy baryon octet.
基金Supported by the National Natural Science Foundation of China under Grant No.19675034.
文摘The dependence of transverse polarization on rapidity ofΛproduced in S+Pb collisions at 200 GeV/c per nucleon has been studied.The original experimental data are from NA36 Collaboration at SPS of CERN.The precession effect ofΛspin,owing to the interactions between spin moment ofΛand the magnetic field on the path whichΛpasses through,on the polarization has been taken into account.The results show that there are slight differences for the transverse polarization in different rapidity-region.The origins for these results have been analysed and discussed.
文摘The ∧^(0) polarization is analyzed with the experinental data in S+Pb collisions at energy 200GeV per nucleon,which were produced at SPS of CERN.The snall.polarization rxalue and thecorrelation betrween the transverse polarization and transverse momentum were obtained in Feyn-man parameter x_(F)>0,r_(F)<0 and all xp.The results show that the non-polarization of lamb-da appears in the vegion of larger transterse momenta,say,at 1-2 GeV/c in P_(T).The originsof polarization reduction are discussed.
基金Supported by the National Natural Science Foundation of China。
文摘The pseudorapidity and azimuthal angle distributions for charged particle produced in pp collisions at 400 GeV/c have been measured by using the LEBC films offered by CERN NA27 collaboration.The split-bin correlation functions have been calculated.The results show that the correlations are produced by resonance-like processces.
文摘Very receat measurements of π+p and K+p elastic seattering at 250GeV/c have been explained by using the generalised Chou-Yang model.Dips are predicted to occur at-t=3.63 and 4.36(GeV/c)^(2) respectively。
基金Supported by the National Natural Science Foundation of China under Grant No.19675033.
文摘The multiplicity fluctuations of charged particles produced in pp collisions at 400 GeV/c have been studied by means of the bunching parameters(BPs).The results show that the values of BPsŋ2(M)andŋ3(M)depend not only on the width of multiplicity distribution,but also on the phase space correlations.The BPs:ŋ2(M)andŋ3(M)follow the same power-law behavior,which indicates that the multifractal structure in pp collisions at 400 GeV/c is observed.
文摘The stationarity hypothesis is essential in hydrological frequency analysis and statistical inference. This assumption is often not fulfilled for large observed datasets, especially in the case of hydro-climatic variables. The Generalized Extreme Value distribution with covariates allows to model data in the presence of non-stationarity and/or dependence on covariates. Linear and non-linear dependence structures have been proposed with the corresponding fitting approach. The objective of the present study is to develop the GEV model with B-Spline in a Bayesian framework. A Markov Chain Monte Carlo (MCMC) algorithm has been developed to estimate quantiles and their posterior distributions. The methods are tested and illustrated using simulated data and applied to meteorological data. Results indicate the better performance of the proposed Bayesian method for rainfall quantile estimation according to BIAS and RMSE criteria especially for high return period events.
