依据氦谱线斯塔克分裂效应测量等离子体中电场强度的基本原理,以管内等离子体为研究对象,采用高压脉冲放电与辐射光谱仪系统同步,获得纳秒动态传播过程中等离子体子弹的电场强度。进一步将该方法应用于对比研究脉冲上升沿和脉冲下降沿...依据氦谱线斯塔克分裂效应测量等离子体中电场强度的基本原理,以管内等离子体为研究对象,采用高压脉冲放电与辐射光谱仪系统同步,获得纳秒动态传播过程中等离子体子弹的电场强度。进一步将该方法应用于对比研究脉冲上升沿和脉冲下降沿放电时管内氦气等离子体的电场分布与传播过程。发现脉冲上升沿放电中等离子体的电场强度高达15.1 k V/cm(距离针尖15 mm处),明显高于脉冲下降沿放电的电场强度。然而,相比于脉冲上升沿放电,脉冲下降沿放电的等离子体传播速度更快。结合等离子体仿真分析发现,高密度的种子电子是造成脉冲下降沿放电等离子体传播速度更快的重要原因。展开更多
One of the earliest events leading to cell activation and growth is the hydrolysis of inositol phospholipids producing various membrane signals induced by an interaction between growth factors or hormones with their r...One of the earliest events leading to cell activation and growth is the hydrolysis of inositol phospholipids producing various membrane signals induced by an interaction between growth factors or hormones with their respective receptors on the cell membrane [1].To demonstrate the mitogenic action of transferrin,our results show that an addition of transferrin to “serum-deprived” rat hepatoma cells produced a rapid but transient rise in inositol 1,4,5-trisphosphate(IP3) level,and at the same time,an increased intracellular Ca^2+ activity and a cytoplasmic alkalinization were observed.These signal transductions further lend support to the mitogenic nature of transferrin.In addition,a possible link between the receptor-mediated endocytosis of transferrin with the generation of intracellular signals is discussed herewith.展开更多
Dear Editors,Recently,a nanomechanical resonator with frequency of the order of 1 GHz approaches the quantum regime[1],it is getting closer to test the basic principles of quantum mechanics and very important in the s...Dear Editors,Recently,a nanomechanical resonator with frequency of the order of 1 GHz approaches the quantum regime[1],it is getting closer to test the basic principles of quantum mechanics and very important in the study of quantum information[2].Generally,a nanomechanical QED(qubit-resonator)system consists of a superconducting qubit[3]and a nanomechanical resonator.Increasing the amplitude of oscillating,the nonlinearity of nanomechanical resonator[4]is not negligible which can be exploited to generate nonclassical states in展开更多
文摘依据氦谱线斯塔克分裂效应测量等离子体中电场强度的基本原理,以管内等离子体为研究对象,采用高压脉冲放电与辐射光谱仪系统同步,获得纳秒动态传播过程中等离子体子弹的电场强度。进一步将该方法应用于对比研究脉冲上升沿和脉冲下降沿放电时管内氦气等离子体的电场分布与传播过程。发现脉冲上升沿放电中等离子体的电场强度高达15.1 k V/cm(距离针尖15 mm处),明显高于脉冲下降沿放电的电场强度。然而,相比于脉冲上升沿放电,脉冲下降沿放电的等离子体传播速度更快。结合等离子体仿真分析发现,高密度的种子电子是造成脉冲下降沿放电等离子体传播速度更快的重要原因。
文摘One of the earliest events leading to cell activation and growth is the hydrolysis of inositol phospholipids producing various membrane signals induced by an interaction between growth factors or hormones with their respective receptors on the cell membrane [1].To demonstrate the mitogenic action of transferrin,our results show that an addition of transferrin to “serum-deprived” rat hepatoma cells produced a rapid but transient rise in inositol 1,4,5-trisphosphate(IP3) level,and at the same time,an increased intracellular Ca^2+ activity and a cytoplasmic alkalinization were observed.These signal transductions further lend support to the mitogenic nature of transferrin.In addition,a possible link between the receptor-mediated endocytosis of transferrin with the generation of intracellular signals is discussed herewith.
文摘Dear Editors,Recently,a nanomechanical resonator with frequency of the order of 1 GHz approaches the quantum regime[1],it is getting closer to test the basic principles of quantum mechanics and very important in the study of quantum information[2].Generally,a nanomechanical QED(qubit-resonator)system consists of a superconducting qubit[3]and a nanomechanical resonator.Increasing the amplitude of oscillating,the nonlinearity of nanomechanical resonator[4]is not negligible which can be exploited to generate nonclassical states in
