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；
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。
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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