Computational techniques are invaluable to the continued success and development of Magnetic Resonance Imaging (MRI) and to its widespread applications. New processing methods are essential for addressing issues at ea...Computational techniques are invaluable to the continued success and development of Magnetic Resonance Imaging (MRI) and to its widespread applications. New processing methods are essential for addressing issues at each stage of MRI techniques. In this study, we present new sets of non-exponential generating functions representing the NMR transverse magnetizations and signals which are mathematically designed based on the theory and dynamics of the Bloch NMR flow equations. These signals are functions of many spinning nuclei of materials and can be used to obtain information observed in all flow systems. The Bloch NMR flow equations are solved using the Boubaker polynomial expansion scheme (BPES) and analytically connect most of the experimentally valuable NMR parameters in a simplified way for general analyses of magnetic resonance imaging with adiabatic condition.展开更多
南谷洞水电站经过长时间运行设备老化问题突出、发电效率低下、水能利用率低,为了提高水能资源的利用率,利用模糊综合评价方法对南谷洞电站增效扩容方案进行评价,将定性的因素集进行定量评价,以多年平均发电量、多年平均弃水量、经济效...南谷洞水电站经过长时间运行设备老化问题突出、发电效率低下、水能利用率低,为了提高水能资源的利用率,利用模糊综合评价方法对南谷洞电站增效扩容方案进行评价,将定性的因素集进行定量评价,以多年平均发电量、多年平均弃水量、经济效益、工程投资、水资源利用率为因素集,为了避免决策者个人主观臆断造成的决策偏差,应用层次分析法确定各影响因素权重,得到最优改造方案。计算结果表明:南谷洞水电站的装机容量由1 600 k W增加到2 800 k W时,综合评价指标最高,为最优增效扩容方案。展开更多
文摘Computational techniques are invaluable to the continued success and development of Magnetic Resonance Imaging (MRI) and to its widespread applications. New processing methods are essential for addressing issues at each stage of MRI techniques. In this study, we present new sets of non-exponential generating functions representing the NMR transverse magnetizations and signals which are mathematically designed based on the theory and dynamics of the Bloch NMR flow equations. These signals are functions of many spinning nuclei of materials and can be used to obtain information observed in all flow systems. The Bloch NMR flow equations are solved using the Boubaker polynomial expansion scheme (BPES) and analytically connect most of the experimentally valuable NMR parameters in a simplified way for general analyses of magnetic resonance imaging with adiabatic condition.
文摘南谷洞水电站经过长时间运行设备老化问题突出、发电效率低下、水能利用率低,为了提高水能资源的利用率,利用模糊综合评价方法对南谷洞电站增效扩容方案进行评价,将定性的因素集进行定量评价,以多年平均发电量、多年平均弃水量、经济效益、工程投资、水资源利用率为因素集,为了避免决策者个人主观臆断造成的决策偏差,应用层次分析法确定各影响因素权重,得到最优改造方案。计算结果表明:南谷洞水电站的装机容量由1 600 k W增加到2 800 k W时,综合评价指标最高,为最优增效扩容方案。
