Dispersion fuels,knowned for their excellent safety performance,are widely used in advanced reactors,such as hightemperature gas-cooled reactors.Compared with deterministic methods,the Monte Carlo method has more adva...Dispersion fuels,knowned for their excellent safety performance,are widely used in advanced reactors,such as hightemperature gas-cooled reactors.Compared with deterministic methods,the Monte Carlo method has more advantages in the geometric modeling of stochastic media.The explicit modeling method has high computational accuracy and high computational cost.The chord length sampling(CLS)method can improve computational efficiency by sampling the chord length during neutron transport using the matrix chord length?s probability density function.This study shows that the excluded-volume effect in realistic stochastic media can introduce certain deviations into the CLS.A chord length correction approach is proposed to obtain the chord length correction factor by developing the Particle code based on equivalent transmission probability.Through numerical analysis against reference solutions from explicit modeling in the RMC code,it was demonstrated that CLS with the proposed correction method provides good accuracy for addressing the excludedvolume effect in realistic infinite stochastic media.展开更多
目的:考察不同取样方式对光阻法检测小装量治疗性抗体不溶性微粒的影响。方法:采用光阻法对体积小于25 m L的19个靶点65个批次治疗性抗体中≥2μm、≥10μm和≥25μm的不溶性微粒进行检测,将抗体分为3组,取样方式分别为单支样品不同取...目的:考察不同取样方式对光阻法检测小装量治疗性抗体不溶性微粒的影响。方法:采用光阻法对体积小于25 m L的19个靶点65个批次治疗性抗体中≥2μm、≥10μm和≥25μm的不溶性微粒进行检测,将抗体分为3组,取样方式分别为单支样品不同取样体积(0.5、1、3 m L)检测与合并样品(取样体积5 m L)检测,合并样品不同取样体积(0.5、1、3、5 m L)检测,以及合并样品后稀释(稀释20、10、5倍)检测与合并样品原倍检测。结果:对于≥2μm、≥10μm、≥25μm的不溶性微粒,不管是采用单支样品不同取样体积还是采用合并样品后不同取样体积,与合并样品后每次取样5 m L的不溶性微粒检测结果相比,均没有统计学意义上的差异;且≥2μm不溶性微粒的取样体积变异小于≥10μm、≥25μm的不溶性微粒。合并样品后稀释检测的结果则与合并样品检测的结果具有统计学差异,且稀释后的结果要高于未稀释的结果,稀释倍数越大,与未稀释结果的差异也越大。结论:采用光阻法对体积小于25 m L的小装量治疗性抗体进行不溶性微粒检测时,为节省样品并减少外源微粒污染,不管单支取样还是合并取样,均可首先考虑选择小于5 m L的单次取样体积进行检测,而对合并后稀释检测的方式应慎重选择。展开更多
文摘Dispersion fuels,knowned for their excellent safety performance,are widely used in advanced reactors,such as hightemperature gas-cooled reactors.Compared with deterministic methods,the Monte Carlo method has more advantages in the geometric modeling of stochastic media.The explicit modeling method has high computational accuracy and high computational cost.The chord length sampling(CLS)method can improve computational efficiency by sampling the chord length during neutron transport using the matrix chord length?s probability density function.This study shows that the excluded-volume effect in realistic stochastic media can introduce certain deviations into the CLS.A chord length correction approach is proposed to obtain the chord length correction factor by developing the Particle code based on equivalent transmission probability.Through numerical analysis against reference solutions from explicit modeling in the RMC code,it was demonstrated that CLS with the proposed correction method provides good accuracy for addressing the excludedvolume effect in realistic infinite stochastic media.
文摘目的:考察不同取样方式对光阻法检测小装量治疗性抗体不溶性微粒的影响。方法:采用光阻法对体积小于25 m L的19个靶点65个批次治疗性抗体中≥2μm、≥10μm和≥25μm的不溶性微粒进行检测,将抗体分为3组,取样方式分别为单支样品不同取样体积(0.5、1、3 m L)检测与合并样品(取样体积5 m L)检测,合并样品不同取样体积(0.5、1、3、5 m L)检测,以及合并样品后稀释(稀释20、10、5倍)检测与合并样品原倍检测。结果:对于≥2μm、≥10μm、≥25μm的不溶性微粒,不管是采用单支样品不同取样体积还是采用合并样品后不同取样体积,与合并样品后每次取样5 m L的不溶性微粒检测结果相比,均没有统计学意义上的差异;且≥2μm不溶性微粒的取样体积变异小于≥10μm、≥25μm的不溶性微粒。合并样品后稀释检测的结果则与合并样品检测的结果具有统计学差异,且稀释后的结果要高于未稀释的结果,稀释倍数越大,与未稀释结果的差异也越大。结论:采用光阻法对体积小于25 m L的小装量治疗性抗体进行不溶性微粒检测时,为节省样品并减少外源微粒污染,不管单支取样还是合并取样,均可首先考虑选择小于5 m L的单次取样体积进行检测,而对合并后稀释检测的方式应慎重选择。
