research on pre-task planning has revealed that planned conditions have produced more fluent and complex language than unplanned conditions. to date, most of these studies have investigated the effects of individual planning on language production while collaborative planning has received scant attention. to determine the effects of pre-task planning on second language written production, the p...

Nowadays, developing an integrated energy system (IES) is considered as effective pattern to improve efficiency and reduce supply costs. This study proposes a new index—convertibility index (CI)—to quantitatively assess the flexibility of IES regarding conversion processes between different flow types. Based on CI constraint, planning problem modeled bi-level optimization problem. To solve prop...