This paper proposed an optimal algorithm using the sun line-of-sight vector to improve the probe attitude estimation accuracy in deep-space mission.Firstly,the elaborate analysis of the attitude estimation error from ...This paper proposed an optimal algorithm using the sun line-of-sight vector to improve the probe attitude estimation accuracy in deep-space mission.Firstly,the elaborate analysis of the attitude estimation error from vector observations was done to demonstrate that the geometric relation between the reference vectors is an important factor which influences the accuracy of attitude estimation.Then,with introduction of the sun line-of-sight vector,the attitude quaternion obtained from the star-sensor was converted into a pair of mutually perpendicular reference vectors perpendicular to the sun vector.The normalized weights were calculated according to the accuracy of the sensors.Furthermore,the optimal attitude estimation in the least squares sense was achieved with the quaternion estimation method.Finally,the results of simulation demonstrated the validity of the proposed optimal algorithm based on the practical data of the Deep Impact mission.展开更多
Gene expression of nerve growth factor receptor (NGFR), epidermal growth factor receptor (EGFR), chromogranin A (CGA) and neuropetide Y (NPY)in 4 aeuroblsstoma cell lines without N-myc amplification was studied by win...Gene expression of nerve growth factor receptor (NGFR), epidermal growth factor receptor (EGFR), chromogranin A (CGA) and neuropetide Y (NPY)in 4 aeuroblsstoma cell lines without N-myc amplification was studied by wins Northern blot technique, N type cells expressed more NGFR mRNA than S type cells and have only little or no EGFR expression. S type cells had stronger expression of EGFR mRNA than that of N type cells accompanying with only less or even no NGFR expression. The results Indicated that difference of gene expression of theae growth factor receptors might be due to the various of tumor cell differetiation. Celli differentiating toward neurons gave more NGFR expression and cells prepared to be differentiating toward other direction might give more EGFR gene expression.Various gene expression of CGA and NPY In neuroblsstoma cell lines might be due to the presence of different stages of tumor cell differentiation and NGF only Induced differentiation of those neuroblastoma cells ready to be differentiation to neurons afterwards.展开更多
The hairpin probe using microwave resonance in plasma is applicable to high pressure 1.33 ×10^3-1.01×10^5 Pa）） as developed recently. In this work, an analytic model of the hairpin resonator probe surround...The hairpin probe using microwave resonance in plasma is applicable to high pressure 1.33 ×10^3-1.01×10^5 Pa）） as developed recently. In this work, an analytic model of the hairpin resonator probe surrounded by a thin dielectric layer and a sheath layer is proposed. The correction factor due to these surroundings is analytically found and confirmed by electromagnetic field finite difference time domain simulation, thus enabling the accurate measurement of electron density in a high-pressure non-equilibrium uniform discharge.展开更多
提出一种基于NARX(Nonlinear Auto-Regressive Model with Exogenous Inputs)神经网络和谐波探测法的非线性系统传递函数识别方法。该方法可基于实测响应数据,采用NARX神经网络方法对结构响应模型进行训练。在此基础上采用谐波探测法得...提出一种基于NARX(Nonlinear Auto-Regressive Model with Exogenous Inputs)神经网络和谐波探测法的非线性系统传递函数识别方法。该方法可基于实测响应数据,采用NARX神经网络方法对结构响应模型进行训练。在此基础上采用谐波探测法得到系统响应传递函数。选取深海半潜浮式平台及系泊系统为研究对象,计算平台及其系泊系统在不同波浪工况作用下的时域耦合响应,以波高和系泊缆张力时程作为数据集,利用NARX神经网络结合谐波探测法辨识此系泊系统的响应传递函数。采用识别的传递函数预测系泊缆在不同海况下的张力响应,并与数值计算结果进行对比,证明NARX神经网络结合谐波探测法可较好地识别系泊浮体系统的非线性响应传递函数,并能够对系泊系统的张力响应进行准确预测。展开更多
文摘This paper proposed an optimal algorithm using the sun line-of-sight vector to improve the probe attitude estimation accuracy in deep-space mission.Firstly,the elaborate analysis of the attitude estimation error from vector observations was done to demonstrate that the geometric relation between the reference vectors is an important factor which influences the accuracy of attitude estimation.Then,with introduction of the sun line-of-sight vector,the attitude quaternion obtained from the star-sensor was converted into a pair of mutually perpendicular reference vectors perpendicular to the sun vector.The normalized weights were calculated according to the accuracy of the sensors.Furthermore,the optimal attitude estimation in the least squares sense was achieved with the quaternion estimation method.Finally,the results of simulation demonstrated the validity of the proposed optimal algorithm based on the practical data of the Deep Impact mission.
文摘Gene expression of nerve growth factor receptor (NGFR), epidermal growth factor receptor (EGFR), chromogranin A (CGA) and neuropetide Y (NPY)in 4 aeuroblsstoma cell lines without N-myc amplification was studied by wins Northern blot technique, N type cells expressed more NGFR mRNA than S type cells and have only little or no EGFR expression. S type cells had stronger expression of EGFR mRNA than that of N type cells accompanying with only less or even no NGFR expression. The results Indicated that difference of gene expression of theae growth factor receptors might be due to the various of tumor cell differetiation. Celli differentiating toward neurons gave more NGFR expression and cells prepared to be differentiating toward other direction might give more EGFR gene expression.Various gene expression of CGA and NPY In neuroblsstoma cell lines might be due to the presence of different stages of tumor cell differentiation and NGF only Induced differentiation of those neuroblastoma cells ready to be differentiation to neurons afterwards.
基金supported by the National Natural Science Foundation of China (Grant No. 10835004 )the 2nd Knowledge Cluster Research Project of Japan:Tokai Region Nanotechnology Manufacturing Cluster (Innovation of Environment Friendly Highly Functional Materials and Devices)
文摘The hairpin probe using microwave resonance in plasma is applicable to high pressure 1.33 ×10^3-1.01×10^5 Pa）） as developed recently. In this work, an analytic model of the hairpin resonator probe surrounded by a thin dielectric layer and a sheath layer is proposed. The correction factor due to these surroundings is analytically found and confirmed by electromagnetic field finite difference time domain simulation, thus enabling the accurate measurement of electron density in a high-pressure non-equilibrium uniform discharge.
文摘提出一种基于NARX(Nonlinear Auto-Regressive Model with Exogenous Inputs)神经网络和谐波探测法的非线性系统传递函数识别方法。该方法可基于实测响应数据,采用NARX神经网络方法对结构响应模型进行训练。在此基础上采用谐波探测法得到系统响应传递函数。选取深海半潜浮式平台及系泊系统为研究对象,计算平台及其系泊系统在不同波浪工况作用下的时域耦合响应,以波高和系泊缆张力时程作为数据集,利用NARX神经网络结合谐波探测法辨识此系泊系统的响应传递函数。采用识别的传递函数预测系泊缆在不同海况下的张力响应,并与数值计算结果进行对比,证明NARX神经网络结合谐波探测法可较好地识别系泊浮体系统的非线性响应传递函数,并能够对系泊系统的张力响应进行准确预测。
