HIT(Heterojunction with intrinsic Thinlayer)异质结太阳能电池作为性能最好的一种异质结电池,近年来成为电池领域的研究热点。在总结HIT异质结太阳能电池的研究进程与现状基础上,分析了影响HIT异质结太阳能电池效率的关键因素和提升...HIT(Heterojunction with intrinsic Thinlayer)异质结太阳能电池作为性能最好的一种异质结电池,近年来成为电池领域的研究热点。在总结HIT异质结太阳能电池的研究进程与现状基础上,分析了影响HIT异质结太阳能电池效率的关键因素和提升效率的方法,针对目前研究和应用中存在的问题,指出了未来的研究重点与关键问题。展开更多
In order to solve the problems of high experimental cost of ammunition,lack of field test data,and the difficulty in applying the ammunition hit probability estimation method in classical statistics,this paper assumes...In order to solve the problems of high experimental cost of ammunition,lack of field test data,and the difficulty in applying the ammunition hit probability estimation method in classical statistics,this paper assumes that the projectile dispersion of ammunition is a two-dimensional joint normal distribution,and proposes a new Bayesian inference method of ammunition hit probability based on normal-inverse Wishart distribution.Firstly,the conjugate joint prior distribution of the projectile dispersion characteristic parameters is determined to be a normal inverse Wishart distribution,and the hyperparameters in the prior distribution are estimated by simulation experimental data and historical measured data.Secondly,the field test data is integrated with the Bayesian formula to obtain the joint posterior distribution of the projectile dispersion characteristic parameters,and then the hit probability of the ammunition is estimated.Finally,compared with the binomial distribution method,the method in this paper can consider the dispersion information of ammunition projectiles,and the hit probability information is more fully utilized.The hit probability results are closer to the field shooting test samples.This method has strong applicability and is conducive to obtaining more accurate hit probability estimation results.展开更多
当英语母语者说“I’m gonna hit the hay.”时,千万别以为他要去农场“击打干草”,这句话的实际含义是“我要上床睡觉了”。短语hit the hay背后藏着19世纪美国农村的生活图景。19世纪中后期,美国西部大开发推动农业快速发展,大量农民...当英语母语者说“I’m gonna hit the hay.”时,千万别以为他要去农场“击打干草”,这句话的实际含义是“我要上床睡觉了”。短语hit the hay背后藏着19世纪美国农村的生活图景。19世纪中后期,美国西部大开发推动农业快速发展,大量农民与拓荒者过着日出而作、日落而息的生活。当时人们的住宿条件简陋,床垫尚未普及,人们常用干草(hay)铺在床架上作为“床垫”。这种干草床垫既柔软又能防潮,是农村家庭的标配。忙碌一天后,人们最放松的时刻便是“躺在干草堆上”休息,而hit在这里并非“击打”,而是“躺靠、接触”的口语化表达,类似hit the bed中的hit。展开更多
文摘HIT(Heterojunction with intrinsic Thinlayer)异质结太阳能电池作为性能最好的一种异质结电池,近年来成为电池领域的研究热点。在总结HIT异质结太阳能电池的研究进程与现状基础上,分析了影响HIT异质结太阳能电池效率的关键因素和提升效率的方法,针对目前研究和应用中存在的问题,指出了未来的研究重点与关键问题。
基金supported by the National Natural Science Foundation of China(No.71501183).
文摘In order to solve the problems of high experimental cost of ammunition,lack of field test data,and the difficulty in applying the ammunition hit probability estimation method in classical statistics,this paper assumes that the projectile dispersion of ammunition is a two-dimensional joint normal distribution,and proposes a new Bayesian inference method of ammunition hit probability based on normal-inverse Wishart distribution.Firstly,the conjugate joint prior distribution of the projectile dispersion characteristic parameters is determined to be a normal inverse Wishart distribution,and the hyperparameters in the prior distribution are estimated by simulation experimental data and historical measured data.Secondly,the field test data is integrated with the Bayesian formula to obtain the joint posterior distribution of the projectile dispersion characteristic parameters,and then the hit probability of the ammunition is estimated.Finally,compared with the binomial distribution method,the method in this paper can consider the dispersion information of ammunition projectiles,and the hit probability information is more fully utilized.The hit probability results are closer to the field shooting test samples.This method has strong applicability and is conducive to obtaining more accurate hit probability estimation results.
文摘当英语母语者说“I’m gonna hit the hay.”时,千万别以为他要去农场“击打干草”,这句话的实际含义是“我要上床睡觉了”。短语hit the hay背后藏着19世纪美国农村的生活图景。19世纪中后期,美国西部大开发推动农业快速发展,大量农民与拓荒者过着日出而作、日落而息的生活。当时人们的住宿条件简陋,床垫尚未普及,人们常用干草(hay)铺在床架上作为“床垫”。这种干草床垫既柔软又能防潮,是农村家庭的标配。忙碌一天后,人们最放松的时刻便是“躺在干草堆上”休息,而hit在这里并非“击打”,而是“躺靠、接触”的口语化表达,类似hit the bed中的hit。
