As an essential element, zinc also is a heavy metal. Non-heading Chinese cabbage showed obvious tolerance to Zn stress in former research. To further understand the mechanisms involved in Zn adaptability and detoxific...As an essential element, zinc also is a heavy metal. Non-heading Chinese cabbage showed obvious tolerance to Zn stress in former research. To further understand the mechanisms involved in Zn adaptability and detoxification, two genotypes Suzhouqing and Aijiaohuang were selected to investigate the chemical forms of Zn and root exudation. Zinc stress obvious strained the plant growth, and Aijiaohuang was more injured than Suhouqing under Zn stress. Under normal Zn levels, the chemical forms of Zn were diverse in three organs between genotypes. Results showed extractions of 2% HAc, 80% ethanol and 1 M NaCl were separately dominant in roots, petioles and leaves. However, under Zn stress (13 mg·L–1 and 52 mg·L–1) most of the Zn was extracted by 1M NaCl, and the subdominant amount of Zn was extracted by 80% ethanol. In the control only four types of organic acid could be detected. While under Zn stress, oxalic acid, tartaric acid, malic acid, lactic acid, acetic acid, citric acid and amber acid were all detected, so it could be speculated Zn detoxification with organic ligands or integrated with pectates and proteins in cells might be responsible for the adaptation of Zn stress in Chinese cabbage.展开更多
数字波束形成技术(digital beam forming,DBF)是构建智能天线系统的主要技术之一,而中途算法(mid-way,MW)是作为一种典型的全自动算法,对阵列误差具有良好的鲁棒性。针对中途算法面对阵列误差时如何提升鲁棒性的问题,文章提出了一种基...数字波束形成技术(digital beam forming,DBF)是构建智能天线系统的主要技术之一,而中途算法(mid-way,MW)是作为一种典型的全自动算法,对阵列误差具有良好的鲁棒性。针对中途算法面对阵列误差时如何提升鲁棒性的问题,文章提出了一种基于多项式求根的中途算法,将原算法的定义域(即对角加载量)从非负实数域拓展到了整个实数域,仿真结果表明,多项式求根解法提高了算法的运算速度,同时算法的输出信干噪比(signal to interference plus noise ratio,SINR)指标也得到了提升。展开更多
文摘As an essential element, zinc also is a heavy metal. Non-heading Chinese cabbage showed obvious tolerance to Zn stress in former research. To further understand the mechanisms involved in Zn adaptability and detoxification, two genotypes Suzhouqing and Aijiaohuang were selected to investigate the chemical forms of Zn and root exudation. Zinc stress obvious strained the plant growth, and Aijiaohuang was more injured than Suhouqing under Zn stress. Under normal Zn levels, the chemical forms of Zn were diverse in three organs between genotypes. Results showed extractions of 2% HAc, 80% ethanol and 1 M NaCl were separately dominant in roots, petioles and leaves. However, under Zn stress (13 mg·L–1 and 52 mg·L–1) most of the Zn was extracted by 1M NaCl, and the subdominant amount of Zn was extracted by 80% ethanol. In the control only four types of organic acid could be detected. While under Zn stress, oxalic acid, tartaric acid, malic acid, lactic acid, acetic acid, citric acid and amber acid were all detected, so it could be speculated Zn detoxification with organic ligands or integrated with pectates and proteins in cells might be responsible for the adaptation of Zn stress in Chinese cabbage.
文摘数字波束形成技术(digital beam forming,DBF)是构建智能天线系统的主要技术之一,而中途算法(mid-way,MW)是作为一种典型的全自动算法,对阵列误差具有良好的鲁棒性。针对中途算法面对阵列误差时如何提升鲁棒性的问题,文章提出了一种基于多项式求根的中途算法,将原算法的定义域(即对角加载量)从非负实数域拓展到了整个实数域,仿真结果表明,多项式求根解法提高了算法的运算速度,同时算法的输出信干噪比(signal to interference plus noise ratio,SINR)指标也得到了提升。
