Anti-jamming performance evaluation has recently received significant attention. For Link-16, the anti-jamming performance evaluation and selection of the optimal anti-jamming technologies are urgent problems to be so...Anti-jamming performance evaluation has recently received significant attention. For Link-16, the anti-jamming performance evaluation and selection of the optimal anti-jamming technologies are urgent problems to be solved. A comprehensive evaluation method is proposed, which combines grey relational analysis (GRA) and cloud model, to evaluate the anti-jamming performances of Link-16. Firstly, on the basis of establishing the anti-jamming performance evaluation indicator system of Link-16, the linear combination of analytic hierarchy process(AHP) and entropy weight method (EWM) are used to calculate the combined weight. Secondly, the qualitative and quantitative concept transformation model, i.e., the cloud model, is introduced to evaluate the anti-jamming abilities of Link-16 under each jamming scheme. In addition, GRA calculates the correlation degree between evaluation indicators and the anti-jamming performance of Link-16, and assesses the best anti-jamming technology. Finally, simulation results prove that the proposed evaluation model can achieve the objective of feasible and practical evaluation, which opens up a novel way for the research of anti-jamming performance evaluations of Link-16.展开更多
During a hypothetical severe accident of light water reactors,the reactor pressure vessel(RPV) could fail due to its creep under the influence of high-temperature corium.Hence,modelling of creep behavior of the RPV is...During a hypothetical severe accident of light water reactors,the reactor pressure vessel(RPV) could fail due to its creep under the influence of high-temperature corium.Hence,modelling of creep behavior of the RPV is paramount to reactor safety analysis since it predicts the transition point of accident progression from in-vessel to ex-vessel phase.In the present study we proposed a new creep model for the classical French RPV steel 16 MND5,which is adapted from the "theta-projection model" and contains all three stages of a creep process.Creep curves are expressed as a function of time with five model parameters θ_i(i=1-4 and m).A model parameter dataset was constructed by fitting experimental creep curves into this function.To correlate the creep curves for different temperatures and stress loads,we directly interpolate the model’s parameters θ_i(i=1-4 and m) from this dataset,in contrast to the conventional "theta-projection model" which employs an extra single correlation for each θ_i(i=1-4 andm),to better accommodate all experimental curves over the wide ranges of temperature and stress loads.We also put a constraint on the trend of the creep strain that it would monotonically increase with temperature and stress load.A good agreement was achieved between each experimental creep curve and corresponding model’s prediction.The widely used time-hardening and strain-hardening models were performing reasonably well in the new method.展开更多
Tractor model BY 304-16 is a four-wheel-drive tractor which is of a newdesign based on model BY 284-16,and gained national assessment in April 1996.At present the product has begun to be exportedto the United States. ...Tractor model BY 304-16 is a four-wheel-drive tractor which is of a newdesign based on model BY 284-16,and gained national assessment in April 1996.At present the product has begun to be exportedto the United States. A direct injection, 3-cylinder dieselengine 395 is used in this tractor, with itsmaximum traction force reaching 9.37KN,its rated output power reaching 30HP, andits maximum output power reaching 35HP.展开更多
收集人、大猪、小猪、大鼠、小鼠以及鸡五个不同个体的粪便样品,每个个体取两个平行样,提取总DNA;PCR扩增,获得16S r RNA V6标签片段;Illumina测序;经BIPES以及QIIME分析并比较菌群结构及多样性。研究结果发现,不同物种之间肠道菌群差...收集人、大猪、小猪、大鼠、小鼠以及鸡五个不同个体的粪便样品,每个个体取两个平行样,提取总DNA;PCR扩增,获得16S r RNA V6标签片段;Illumina测序;经BIPES以及QIIME分析并比较菌群结构及多样性。研究结果发现,不同物种之间肠道菌群差异较大。五类物种肠道菌群均以厚壁菌门、拟杆菌门、以及变形菌门为主,但鸡的厚壁菌门显著减少,而变形菌门显著增加。从?多样性角度来看,猪肠道菌群种属丰富度及Shannon指数均显著高于人及鸡肠道菌群。从?多样性角度,尽管不同人之间的肠道菌群相似度较低,但不同物种之间相比较,小猪与大鼠肠道菌群与人相似性高于小鼠和鸡肠道菌群。与人类相比,小猪的肠道微生物组最相近,而鸡的肠道菌群相似度最低。展开更多
基金Heilongjiang Provincial Natural Science Foundation of China (LH2021F009)。
文摘Anti-jamming performance evaluation has recently received significant attention. For Link-16, the anti-jamming performance evaluation and selection of the optimal anti-jamming technologies are urgent problems to be solved. A comprehensive evaluation method is proposed, which combines grey relational analysis (GRA) and cloud model, to evaluate the anti-jamming performances of Link-16. Firstly, on the basis of establishing the anti-jamming performance evaluation indicator system of Link-16, the linear combination of analytic hierarchy process(AHP) and entropy weight method (EWM) are used to calculate the combined weight. Secondly, the qualitative and quantitative concept transformation model, i.e., the cloud model, is introduced to evaluate the anti-jamming abilities of Link-16 under each jamming scheme. In addition, GRA calculates the correlation degree between evaluation indicators and the anti-jamming performance of Link-16, and assesses the best anti-jamming technology. Finally, simulation results prove that the proposed evaluation model can achieve the objective of feasible and practical evaluation, which opens up a novel way for the research of anti-jamming performance evaluations of Link-16.
基金support from the research programs of APRI,ENSI and NKSsupport of the scholarship awarded by the China Scholarship Council(CSC)。
文摘During a hypothetical severe accident of light water reactors,the reactor pressure vessel(RPV) could fail due to its creep under the influence of high-temperature corium.Hence,modelling of creep behavior of the RPV is paramount to reactor safety analysis since it predicts the transition point of accident progression from in-vessel to ex-vessel phase.In the present study we proposed a new creep model for the classical French RPV steel 16 MND5,which is adapted from the "theta-projection model" and contains all three stages of a creep process.Creep curves are expressed as a function of time with five model parameters θ_i(i=1-4 and m).A model parameter dataset was constructed by fitting experimental creep curves into this function.To correlate the creep curves for different temperatures and stress loads,we directly interpolate the model’s parameters θ_i(i=1-4 and m) from this dataset,in contrast to the conventional "theta-projection model" which employs an extra single correlation for each θ_i(i=1-4 andm),to better accommodate all experimental curves over the wide ranges of temperature and stress loads.We also put a constraint on the trend of the creep strain that it would monotonically increase with temperature and stress load.A good agreement was achieved between each experimental creep curve and corresponding model’s prediction.The widely used time-hardening and strain-hardening models were performing reasonably well in the new method.
文摘Tractor model BY 304-16 is a four-wheel-drive tractor which is of a newdesign based on model BY 284-16,and gained national assessment in April 1996.At present the product has begun to be exportedto the United States. A direct injection, 3-cylinder dieselengine 395 is used in this tractor, with itsmaximum traction force reaching 9.37KN,its rated output power reaching 30HP, andits maximum output power reaching 35HP.
文摘收集人、大猪、小猪、大鼠、小鼠以及鸡五个不同个体的粪便样品,每个个体取两个平行样,提取总DNA;PCR扩增,获得16S r RNA V6标签片段;Illumina测序;经BIPES以及QIIME分析并比较菌群结构及多样性。研究结果发现,不同物种之间肠道菌群差异较大。五类物种肠道菌群均以厚壁菌门、拟杆菌门、以及变形菌门为主,但鸡的厚壁菌门显著减少,而变形菌门显著增加。从?多样性角度来看,猪肠道菌群种属丰富度及Shannon指数均显著高于人及鸡肠道菌群。从?多样性角度,尽管不同人之间的肠道菌群相似度较低,但不同物种之间相比较,小猪与大鼠肠道菌群与人相似性高于小鼠和鸡肠道菌群。与人类相比,小猪的肠道微生物组最相近,而鸡的肠道菌群相似度最低。
