In the stage of compaction by initial damage, density damage increment of sandstone is positive and the rate ia positive.

在初始损伤的压密阶段，砂岩的密度损伤增量为正值，速率也为正；

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In the new stage, factors of urban land value increment have new characteristics.

在新的经济、社会背景下，城市土地增值的影响因素呈现新的特点。

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This paper introduces the topology construction and operation principle of single-stage photovoltaic system, mainly illuminates the basic principle of MPPT realized by conductance increment method.

本文介绍了单极式光伏系统的拓扑结构和实现最大功率的工作原理，阐述了电导增量法实现MPPT的基本思想。

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