The acquisition,analysis,and prediction of the radar cross section(RCS)of a target have extremely important strategic significance in the military.However,the RCS values at all azimuths are hardly accessible for non-c...The acquisition,analysis,and prediction of the radar cross section(RCS)of a target have extremely important strategic significance in the military.However,the RCS values at all azimuths are hardly accessible for non-cooperative targets,due to the limitations of radar observation azimuth and detection resources.Despite their efforts to predict the azimuth-dimensional RCS value,traditional methods based on statistical theory fails to achieve the desired results because of the azimuth sensitivity of the target RCS.To address this problem,an improved neural basis expansion analysis for interpretable time series forecasting(N-BEATS)network considering the physical model prior is proposed to predict the azimuth-dimensional RCS value accurately.Concretely,physical model-based constraints are imposed on the network by constructing a scattering-center module based on the target scattering-center model.Besides,a superimposed seasonality module is involved to better capture high-frequency information,and augmenting the training set provides complementary information for learning predictions.Extensive simulations and experimental results are provided to validate the effectiveness of the proposed method.展开更多
本研究测定了100份糜子种质资源的直链淀粉和支链淀粉含量,采用分子标记对胚乳直链淀粉合成调控基因Waxy进行基因分型,并选取不同直链淀粉含量代表种质资源进行基因测序和差异位点分析。结果表明,100份糜子种质资源直链淀粉含量变化幅度...本研究测定了100份糜子种质资源的直链淀粉和支链淀粉含量,采用分子标记对胚乳直链淀粉合成调控基因Waxy进行基因分型,并选取不同直链淀粉含量代表种质资源进行基因测序和差异位点分析。结果表明,100份糜子种质资源直链淀粉含量变化幅度为0~22.78%,平均6.07%,直链淀粉含量低于3.7%的糯性材料占36%,完全糯性材料占24%;支链淀粉含量变化幅度为4.55%~56.73%,平均15.30%。分子标记M5/R11扩增产物能有效区分S_(0)、S_(-15)和S_(0)S_(-15)基因型;标记int5Lf/R3和M12/R12的PCR产物利用内切酶ACC I和Eco N I剪切,可鉴别出L_(C)、L_(Y)、L_(F)基因型。100份糜子种质共发现9种基因型,其中S_(0)/L_(c)数量最多,占33%,S_(-15)/L_(F)占25%,杂合型S_(0)S_(-15)/L_(F)、S_(0)S_(-15)/L_(C)、S_(0)S_(-15)/L_(Y)L_(F)各占2%。通过Waxy基因序列比对,在地方品种甘谷黑蝉背、黑糜子、庆阳饿死牛,育成品种晋黍9号、赤糜2号等种质资源中发现了大量新的SNPs位点,可用于基因功能和糜子育种材料创制研究。本研究结果为糜子分子育种工作及品质改良提供了理论依据。展开更多
基金National Natural Science Foundation of China(61921001,62201588,62022091)。
文摘The acquisition,analysis,and prediction of the radar cross section(RCS)of a target have extremely important strategic significance in the military.However,the RCS values at all azimuths are hardly accessible for non-cooperative targets,due to the limitations of radar observation azimuth and detection resources.Despite their efforts to predict the azimuth-dimensional RCS value,traditional methods based on statistical theory fails to achieve the desired results because of the azimuth sensitivity of the target RCS.To address this problem,an improved neural basis expansion analysis for interpretable time series forecasting(N-BEATS)network considering the physical model prior is proposed to predict the azimuth-dimensional RCS value accurately.Concretely,physical model-based constraints are imposed on the network by constructing a scattering-center module based on the target scattering-center model.Besides,a superimposed seasonality module is involved to better capture high-frequency information,and augmenting the training set provides complementary information for learning predictions.Extensive simulations and experimental results are provided to validate the effectiveness of the proposed method.
文摘本研究测定了100份糜子种质资源的直链淀粉和支链淀粉含量,采用分子标记对胚乳直链淀粉合成调控基因Waxy进行基因分型,并选取不同直链淀粉含量代表种质资源进行基因测序和差异位点分析。结果表明,100份糜子种质资源直链淀粉含量变化幅度为0~22.78%,平均6.07%,直链淀粉含量低于3.7%的糯性材料占36%,完全糯性材料占24%;支链淀粉含量变化幅度为4.55%~56.73%,平均15.30%。分子标记M5/R11扩增产物能有效区分S_(0)、S_(-15)和S_(0)S_(-15)基因型;标记int5Lf/R3和M12/R12的PCR产物利用内切酶ACC I和Eco N I剪切,可鉴别出L_(C)、L_(Y)、L_(F)基因型。100份糜子种质共发现9种基因型,其中S_(0)/L_(c)数量最多,占33%,S_(-15)/L_(F)占25%,杂合型S_(0)S_(-15)/L_(F)、S_(0)S_(-15)/L_(C)、S_(0)S_(-15)/L_(Y)L_(F)各占2%。通过Waxy基因序列比对,在地方品种甘谷黑蝉背、黑糜子、庆阳饿死牛,育成品种晋黍9号、赤糜2号等种质资源中发现了大量新的SNPs位点,可用于基因功能和糜子育种材料创制研究。本研究结果为糜子分子育种工作及品质改良提供了理论依据。
