为了保证新型特高压直流分层接入方式下的电压静态稳定,基于阻抗匹配理论研究了特高压分层接入方式下受端各换流母线的电压稳定裕度。首先,采用电网节点阻抗矩阵和多端口网络等值方法,将分层接入方式下的直流从其落点处等值成两个相对...为了保证新型特高压直流分层接入方式下的电压静态稳定,基于阻抗匹配理论研究了特高压分层接入方式下受端各换流母线的电压稳定裕度。首先,采用电网节点阻抗矩阵和多端口网络等值方法,将分层接入方式下的直流从其落点处等值成两个相对独立单端口网络的形式;进而,利用阻抗匹配定理,推导了分层接入方式下直流在各层换流母线电压稳定裕度的计算表达式;然后,研究了虚拟电压源、虚拟阻抗和虚拟功率的直流等值方案,分析了3种等值方案下所提出电压稳定裕度指标的差异性。最后,以实际锡盟–泰州±800 k V直流输电工程电网数据计算了等值方案下23节点的电压稳定裕度为29.1%,12节点电压稳定裕度为47.5%,算例结果验证了该电压稳定裕度指标在评估换流母线电压稳定性上的可行性。展开更多
以Ag_(2)WO_(4)为电化学活性材料,采用压片法制备超级电容器电极材料.通过X射线衍射仪、扫描电镜、电化学工作站等实验方法,辅以密度函数理论(DFT)计算,对Ag_(2)WO_(4)电极材料进行表征.K^(+)离子嵌入Ag_(2)WO_(4)晶体在循环伏安模式下...以Ag_(2)WO_(4)为电化学活性材料,采用压片法制备超级电容器电极材料.通过X射线衍射仪、扫描电镜、电化学工作站等实验方法,辅以密度函数理论(DFT)计算,对Ag_(2)WO_(4)电极材料进行表征.K^(+)离子嵌入Ag_(2)WO_(4)晶体在循环伏安模式下比电容最大能够达到1344.7 F·g^(-1);在恒流充放电模式下最大可达到182.0 F·g^(-1).实验结果表明:基于K+离子嵌入/脱嵌机制的Ag_(2)WO_(4)电极材料在1 M KOH电解液中可展现良好的循环伏安、恒流充放电以及交流阻抗等电化学特性,具有较高的充放电循环稳定性和比电容保持率.展开更多
传统输电线路检修方法难以提供准确性更高的风险指数,导致故障概率计算结果偏离实际值,影响输电线路检修。基于此,文章研究基于机会约束输电线路检修计划优化(Transmissionline Maintenance Scheduling Plan Optimum,TMSOP)模型的输电...传统输电线路检修方法难以提供准确性更高的风险指数,导致故障概率计算结果偏离实际值,影响输电线路检修。基于此,文章研究基于机会约束输电线路检修计划优化(Transmissionline Maintenance Scheduling Plan Optimum,TMSOP)模型的输电线路检修方法,通过机会约束TMSOP模型设定风险指标,计算输电线路故障分析的2级评估指标权重,结合机会约束TMSOP模型的模糊计算原理,分析各个部件的风险状态,确定评估权重,并计算输电线路故障概率;选取评估特征参量,建立重要性两两比较的判断方程组,再建立输电线路检修等级,比较联系度计算结果;按照故障严重程度设置检修次序,实现基于机会约束TMSOP模型的输电线路检修,制定输电线路检修策略。实验结果表明,所提方法输电线路可靠度为0.8972,小于0.9,证明所提方法测试结果的可靠性。展开更多
Pulmonary hypertension(PH)is a severe pathophysiological condition characterized by pulmonary artery remodeling and continuous increases in pulmonary artery pressure,which may eventually develop to right heart failure...Pulmonary hypertension(PH)is a severe pathophysiological condition characterized by pulmonary artery remodeling and continuous increases in pulmonary artery pressure,which may eventually develop to right heart failure and death.Although newly discovered and incredible treatment strategies in recent years have improved the prognosis of PH,limited types of effective and economical drugs for PH still makes it as a life-threatening disease.Some drugs from Chinese materia medica(CMM)have been traditionally applied in the treatment of lung diseases.Accumulating evidence suggests active pharmaceutical ingredients(APIs)derived from those medicines brings promising future for the prevention and treatment of PH.In this review,we summarized the pharmacological effects of APIs derived from CMM which are potent in treating PH,so as to provide new thoughts for initial drug discovery and identification of potential therapeutic strategies in alternative medicine for PH.展开更多
文摘为了保证新型特高压直流分层接入方式下的电压静态稳定,基于阻抗匹配理论研究了特高压分层接入方式下受端各换流母线的电压稳定裕度。首先,采用电网节点阻抗矩阵和多端口网络等值方法,将分层接入方式下的直流从其落点处等值成两个相对独立单端口网络的形式;进而,利用阻抗匹配定理,推导了分层接入方式下直流在各层换流母线电压稳定裕度的计算表达式;然后,研究了虚拟电压源、虚拟阻抗和虚拟功率的直流等值方案,分析了3种等值方案下所提出电压稳定裕度指标的差异性。最后,以实际锡盟–泰州±800 k V直流输电工程电网数据计算了等值方案下23节点的电压稳定裕度为29.1%,12节点电压稳定裕度为47.5%,算例结果验证了该电压稳定裕度指标在评估换流母线电压稳定性上的可行性。
文摘以Ag_(2)WO_(4)为电化学活性材料,采用压片法制备超级电容器电极材料.通过X射线衍射仪、扫描电镜、电化学工作站等实验方法,辅以密度函数理论(DFT)计算,对Ag_(2)WO_(4)电极材料进行表征.K^(+)离子嵌入Ag_(2)WO_(4)晶体在循环伏安模式下比电容最大能够达到1344.7 F·g^(-1);在恒流充放电模式下最大可达到182.0 F·g^(-1).实验结果表明:基于K+离子嵌入/脱嵌机制的Ag_(2)WO_(4)电极材料在1 M KOH电解液中可展现良好的循环伏安、恒流充放电以及交流阻抗等电化学特性,具有较高的充放电循环稳定性和比电容保持率.
文摘传统输电线路检修方法难以提供准确性更高的风险指数,导致故障概率计算结果偏离实际值,影响输电线路检修。基于此,文章研究基于机会约束输电线路检修计划优化(Transmissionline Maintenance Scheduling Plan Optimum,TMSOP)模型的输电线路检修方法,通过机会约束TMSOP模型设定风险指标,计算输电线路故障分析的2级评估指标权重,结合机会约束TMSOP模型的模糊计算原理,分析各个部件的风险状态,确定评估权重,并计算输电线路故障概率;选取评估特征参量,建立重要性两两比较的判断方程组,再建立输电线路检修等级,比较联系度计算结果;按照故障严重程度设置检修次序,实现基于机会约束TMSOP模型的输电线路检修,制定输电线路检修策略。实验结果表明,所提方法输电线路可靠度为0.8972,小于0.9,证明所提方法测试结果的可靠性。
文摘Pulmonary hypertension(PH)is a severe pathophysiological condition characterized by pulmonary artery remodeling and continuous increases in pulmonary artery pressure,which may eventually develop to right heart failure and death.Although newly discovered and incredible treatment strategies in recent years have improved the prognosis of PH,limited types of effective and economical drugs for PH still makes it as a life-threatening disease.Some drugs from Chinese materia medica(CMM)have been traditionally applied in the treatment of lung diseases.Accumulating evidence suggests active pharmaceutical ingredients(APIs)derived from those medicines brings promising future for the prevention and treatment of PH.In this review,we summarized the pharmacological effects of APIs derived from CMM which are potent in treating PH,so as to provide new thoughts for initial drug discovery and identification of potential therapeutic strategies in alternative medicine for PH.
