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
It is known in the computational electromagnetics （CEM） that the node element has a relative wellconditioned matrix, but suffers from the spurious solution problem; whereas the edge element has no spurious solutions...It is known in the computational electromagnetics （CEM） that the node element has a relative wellconditioned matrix, but suffers from the spurious solution problem; whereas the edge element has no spurious solutions, but usually produces an ill-conditioned matrix. Particularly, when the mesh is over dense, the iterative solution of the matrix equation from edge element converges very slowly. Based on the node element and edge element, a node-edge element is presented, which has no spurious solutions and better-conditioned matrix. Numerical experiments demonstrate that the proposed node-edge element is more efficient than now-widely used edge element.展开更多
为改善用于配电系统潮流计算的前推回代法,提出一种与节点编号无关的前推回代方法,采用类似于数字信号处理(digital signal processing,DSP)技术中的并行流水线技术和单片机的中断等待技术,称为并行中断等待法。用一个算例说明所提方法...为改善用于配电系统潮流计算的前推回代法,提出一种与节点编号无关的前推回代方法,采用类似于数字信号处理(digital signal processing,DSP)技术中的并行流水线技术和单片机的中断等待技术,称为并行中断等待法。用一个算例说明所提方法的计算效率和收敛性,同时与几种现有的方法如基于分层法的前推回代方法、常规的牛顿-拉夫逊法、两种改进的牛顿法即下山算法和Broyden算法进行比较。算例计算结果表明,所提方法在收敛性和计算效率方面更为优越。展开更多
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。
文摘It is known in the computational electromagnetics （CEM） that the node element has a relative wellconditioned matrix, but suffers from the spurious solution problem; whereas the edge element has no spurious solutions, but usually produces an ill-conditioned matrix. Particularly, when the mesh is over dense, the iterative solution of the matrix equation from edge element converges very slowly. Based on the node element and edge element, a node-edge element is presented, which has no spurious solutions and better-conditioned matrix. Numerical experiments demonstrate that the proposed node-edge element is more efficient than now-widely used edge element.
文摘为改善用于配电系统潮流计算的前推回代法,提出一种与节点编号无关的前推回代方法,采用类似于数字信号处理(digital signal processing,DSP)技术中的并行流水线技术和单片机的中断等待技术,称为并行中断等待法。用一个算例说明所提方法的计算效率和收敛性,同时与几种现有的方法如基于分层法的前推回代方法、常规的牛顿-拉夫逊法、两种改进的牛顿法即下山算法和Broyden算法进行比较。算例计算结果表明,所提方法在收敛性和计算效率方面更为优越。
