The power spectrum analyses of the subtropical high indexes reveal a significant 11- and 22- years cycle, coupling well with the same cycle of slar activity.
后者的功率谱分析显示出存在着明显的11和22年振动，且和太阳活动相应的周期很好地耦合。
2
Taking a triple pressure reheat HRSG in the gas-steam combined cycle as an example, a general expression of the steam turbine thermal efficiency to coupling parameter with the unfired HRSG is derived.
The coupling relation of petroleum resources exploitation and regional economic sustainable development of mineral areas is discussed on the basis of the theory of resources requisite life-cycle.