为了揭示沙颍河流域生态系统服务价值(ESV),以沙颍河及其支流所流经的各地级市为研究区,利用PLUS(Patch-generating Land Use Simulation Model,PLUS)模型模拟不同情景下土地利用,采用当量因子法进行ESV评估.结果表明:2019年研究区用地...为了揭示沙颍河流域生态系统服务价值(ESV),以沙颍河及其支流所流经的各地级市为研究区,利用PLUS(Patch-generating Land Use Simulation Model,PLUS)模型模拟不同情景下土地利用,采用当量因子法进行ESV评估.结果表明:2019年研究区用地类型以耕地为主,而建设用地面积明显增长;仅耕地保护情景下2029年ESV有所提高,表明耕地对ESV的主导作用;耕地和林地的生态价值变化度大于1,表明其对该流域ESV变化影响大.该研究为沙颍河流域生态保护和国土空间规划提供科学依据.展开更多
Undercooling solidification under a magnetic field(UMF)is an effective way to tailor the microstructure and properties of Co-based alloys.In this study,by attributing to the UMF treatment,the strength−ductility trade-...Undercooling solidification under a magnetic field(UMF)is an effective way to tailor the microstructure and properties of Co-based alloys.In this study,by attributing to the UMF treatment,the strength−ductility trade-off dilemma in GH605 superalloy is successfully overcome.The UMF treatment can effectively refine the grains and increase the solid solubility,leading to the high yield strength.The main deformation mechanism in the as-forged alloy is dislocation slipping.By contrast,multiple deformation mechanisms,including stacking faults,twining,dislocation slipping,and their strong interactions are activated in the UMF-treated sample during compression deformation,which enhances the strength and ductility simultaneously.In addition,the precipitation of hard Laves phases along the grain boundaries can be obtained after UMF treatment,hindering crack propagation during compression deformation.展开更多
文摘为了揭示沙颍河流域生态系统服务价值(ESV),以沙颍河及其支流所流经的各地级市为研究区,利用PLUS(Patch-generating Land Use Simulation Model,PLUS)模型模拟不同情景下土地利用,采用当量因子法进行ESV评估.结果表明:2019年研究区用地类型以耕地为主,而建设用地面积明显增长;仅耕地保护情景下2029年ESV有所提高,表明耕地对ESV的主导作用;耕地和林地的生态价值变化度大于1,表明其对该流域ESV变化影响大.该研究为沙颍河流域生态保护和国土空间规划提供科学依据.
基金the fund of National Key Laboratory for Precision Hot Processing of Metals,China(No.6142909200104)State Key Laboratory of Solidification Processing(NPU),China(No.2022-TS-08)National Training Program of Innovation and Entrepreneurship for Undergraduates.We thank Dr.ZHENG from ZKKF(Beijing)Science&Technology Company for supporting the characterization of the materials.
文摘Undercooling solidification under a magnetic field(UMF)is an effective way to tailor the microstructure and properties of Co-based alloys.In this study,by attributing to the UMF treatment,the strength−ductility trade-off dilemma in GH605 superalloy is successfully overcome.The UMF treatment can effectively refine the grains and increase the solid solubility,leading to the high yield strength.The main deformation mechanism in the as-forged alloy is dislocation slipping.By contrast,multiple deformation mechanisms,including stacking faults,twining,dislocation slipping,and their strong interactions are activated in the UMF-treated sample during compression deformation,which enhances the strength and ductility simultaneously.In addition,the precipitation of hard Laves phases along the grain boundaries can be obtained after UMF treatment,hindering crack propagation during compression deformation.
