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中文摘要：
建立了一种以无相互作用的自旋系统为工质的量子热机循环模型,基于量子主方程和半群方法,分析了循环的性能特征及其时间演化公式,推导出效率和输出功率的一般表达式,在高温极限下详细推导出它们的具体优化特征.从微观上分析了热机循环的性能优化.
英文摘要：
A new model of a quantum heat engine cycle is established in which the working substance consists of many non-interacting spin-1/2 systems. Performance characteristics of the cycle and time evolution of the spin angular momentum are investigated, based on the quantum master equation and a semi-group approach. The general expressions of efficiency and power output are derived. Further, at high temperatures the optimal relations of efficiency and power output are studied in detail. Optimal performance of heat engine cycles is analyzed from a microscopic model.
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