Modular truss space deployable antennas are key for future large aperture,high precision antennas,already proven in various in-orbit applications globally.This paper introduces a design method for a tetrahedral basic ...Modular truss space deployable antennas are key for future large aperture,high precision antennas,already proven in various in-orbit applications globally.This paper introduces a design method for a tetrahedral basic unit mechanism with dual height positioning nodes.A parametric model is established,and its DOF are analyzed to confirm the mechanism's validity.The new tetrahedral basic unit mechanism constructed by this method is a single DOF mechanism and can locate different parabolic node heights.In order to further adapt to the parabolic and large aperture requirements of the deployable antenna of the truss,a combination unit and modular unit mechanism are developed based on this tetrahedral unit.The DOF and deployment characteristics of the modular unit mechanism are analyzed and validated through simulations.Various networking methods for the modular units are proposed,followed by a comprehensive performance comparison of different modular truss deployable antenna mechanisms.A prototype model of the modular unit mechanism is also developed,with deployment experiments demonstrating the mechanism's simplicity,low DOF,and large deployment ratio.The findings of this study provide a theoretical and technical basis for the future design and development of truss deployable antenna mechanisms.展开更多
为探究大豆基于株高抗旱系数(drought resistance coefficient based on plant height,DCPH)和主茎节数抗旱系数(drought resistance coefficient based on number of main stem nodes,DCNS)的抗性遗传基础,本研究选取由113份大豆品种(...为探究大豆基于株高抗旱系数(drought resistance coefficient based on plant height,DCPH)和主茎节数抗旱系数(drought resistance coefficient based on number of main stem nodes,DCNS)的抗性遗传基础,本研究选取由113份大豆品种(系)组成的自然群体作为研究材料,在全生育期干旱胁迫和正常供水条件下测定了株高和主茎节数,分别计算两种类型的抗旱系数,并利用全基因组关联分析技术(Genome-Wide Association Study,GWAS),挖掘与大豆株高和主茎节数抗旱性相关的基因和位点。结果显示:利用1882531个SNP标记进行GWAS分析,DCPH显著关联的位点全部位于9号染色体上,而DCNS显著关联的位点全部位于6号染色体上。进一步分析确定了DCPH和DCNS的候选基因区间,分别筛选出41个与DCPH相关的候选基因和15个与DCNS相关的候选基因。这些基因可能参与大豆生长发育的调控、激素信号传导、细胞分裂和生长等过程。本研究不仅为深入解析大豆抗旱性的分子机制提供了重要线索,还为培育抗旱性强的大豆品种提供了宝贵的基因资源。展开更多
基金sponsored by the National Natural Science Foundation of China(No.52075467)Hebei Province Fund Outstanding Youth Fund Project,China(No.E2024203107)。
文摘Modular truss space deployable antennas are key for future large aperture,high precision antennas,already proven in various in-orbit applications globally.This paper introduces a design method for a tetrahedral basic unit mechanism with dual height positioning nodes.A parametric model is established,and its DOF are analyzed to confirm the mechanism's validity.The new tetrahedral basic unit mechanism constructed by this method is a single DOF mechanism and can locate different parabolic node heights.In order to further adapt to the parabolic and large aperture requirements of the deployable antenna of the truss,a combination unit and modular unit mechanism are developed based on this tetrahedral unit.The DOF and deployment characteristics of the modular unit mechanism are analyzed and validated through simulations.Various networking methods for the modular units are proposed,followed by a comprehensive performance comparison of different modular truss deployable antenna mechanisms.A prototype model of the modular unit mechanism is also developed,with deployment experiments demonstrating the mechanism's simplicity,low DOF,and large deployment ratio.The findings of this study provide a theoretical and technical basis for the future design and development of truss deployable antenna mechanisms.
文摘为探究大豆基于株高抗旱系数(drought resistance coefficient based on plant height,DCPH)和主茎节数抗旱系数(drought resistance coefficient based on number of main stem nodes,DCNS)的抗性遗传基础,本研究选取由113份大豆品种(系)组成的自然群体作为研究材料,在全生育期干旱胁迫和正常供水条件下测定了株高和主茎节数,分别计算两种类型的抗旱系数,并利用全基因组关联分析技术(Genome-Wide Association Study,GWAS),挖掘与大豆株高和主茎节数抗旱性相关的基因和位点。结果显示:利用1882531个SNP标记进行GWAS分析,DCPH显著关联的位点全部位于9号染色体上,而DCNS显著关联的位点全部位于6号染色体上。进一步分析确定了DCPH和DCNS的候选基因区间,分别筛选出41个与DCPH相关的候选基因和15个与DCNS相关的候选基因。这些基因可能参与大豆生长发育的调控、激素信号传导、细胞分裂和生长等过程。本研究不仅为深入解析大豆抗旱性的分子机制提供了重要线索,还为培育抗旱性强的大豆品种提供了宝贵的基因资源。
基金Innovation Funds of Undergraduate of NEAUThe National Key Technology R&D Program(2011BAD35B06-1)+1 种基金National Science Foundation for Post-doctoral Scientists of China(2012M520700)Research Foundation of NEAU(2012RCB38)
