The Eotvos experiment on the verification of equivalence between inertial mass and gravitational mass of a body is famous for its accuracy. A question is, however, can these experimental results be applied to the case...The Eotvos experiment on the verification of equivalence between inertial mass and gravitational mass of a body is famous for its accuracy. A question is, however, can these experimental results be applied to the case of a physical space in general relativity, where the space coordinates could be arbitrary？ It is pointed out that it can be validly applied because it has been proven that Einstein＇s equivalence principle for a physical space must have a frame of reference with the Euclidean-like structure. Will claimed further that such an overall accuracy can be translated into an accuracy of the equivalence between inertial mass and each type of energy. It is shown that, according to general relativity, such a claim is incorrect. The root of this problem is due to an inadequate understanding of special relativity that produced the famous equation E=mc^2, which must be understood in terms of energy conservation. Concurrently, it is pointed out that this error is a problem in Will＇s book, ‘Theory and Experiment in Gravitational Physics＇.展开更多
概括电力系统静态电压稳定分析方法,对现有的静态电压稳定性指标进行分析和总结。基于仿真软件PSS/E(thePower System Simulator for Engineering)和PSASP(电力系统分析综合程序),提出分别根据灵敏度指标和节点参与因子指标确定静态电...概括电力系统静态电压稳定分析方法,对现有的静态电压稳定性指标进行分析和总结。基于仿真软件PSS/E(thePower System Simulator for Engineering)和PSASP(电力系统分析综合程序),提出分别根据灵敏度指标和节点参与因子指标确定静态电压稳定薄弱区域的方法。运用这两种方法,对EPRI-36节点系统进行静态电压稳定分析,确定系统的薄弱节点和薄弱区域,仿真结果表明了这两种方法的有效性。这两种方法计算简单、准确度较高,特别是前一种方法对大型互联电网具有良好的适应性。展开更多
文摘The Eotvos experiment on the verification of equivalence between inertial mass and gravitational mass of a body is famous for its accuracy. A question is, however, can these experimental results be applied to the case of a physical space in general relativity, where the space coordinates could be arbitrary？ It is pointed out that it can be validly applied because it has been proven that Einstein＇s equivalence principle for a physical space must have a frame of reference with the Euclidean-like structure. Will claimed further that such an overall accuracy can be translated into an accuracy of the equivalence between inertial mass and each type of energy. It is shown that, according to general relativity, such a claim is incorrect. The root of this problem is due to an inadequate understanding of special relativity that produced the famous equation E=mc^2, which must be understood in terms of energy conservation. Concurrently, it is pointed out that this error is a problem in Will＇s book, ‘Theory and Experiment in Gravitational Physics＇.
文摘概括电力系统静态电压稳定分析方法,对现有的静态电压稳定性指标进行分析和总结。基于仿真软件PSS/E(thePower System Simulator for Engineering)和PSASP(电力系统分析综合程序),提出分别根据灵敏度指标和节点参与因子指标确定静态电压稳定薄弱区域的方法。运用这两种方法,对EPRI-36节点系统进行静态电压稳定分析,确定系统的薄弱节点和薄弱区域,仿真结果表明了这两种方法的有效性。这两种方法计算简单、准确度较高,特别是前一种方法对大型互联电网具有良好的适应性。
