This paper analyzed the material flow situation in argo-animal husbandry ecosystem by compartment model. This model was an important mean for investigating the whole structural characteristics in ecosystem. Based on t...This paper analyzed the material flow situation in argo-animal husbandry ecosystem by compartment model. This model was an important mean for investigating the whole structural characteristics in ecosystem. Based on this analysis, characteristics of material cycle and integrity in the system were mastered. As an example of natural conditions in Yonghe Village, Shuangcheng Township, Shuangeheng Municipal, Heilongjang Province, the system of linear differential equations in system was established by extracting each compartment and investigating material flow and stability of this model was proved by Lyapunov linear theory. The result showed that this system could not be interfered by initial value in the state of present, input and output.展开更多
首先,将9,9-二(3,5-二甲基-4-羟基苯基)芴(DMBHF)、9,9-双(4-羟苯基)芴(BHF)和4,4’-二氟二苯甲酮(DFB)在高温下缩聚,得到聚芴醚酮(PFEK-x)(x=30、40、50,x为DMBHF含量,以DFB的物质的量计,下同);接着,利用溴代反应将PFEK-x的甲基功能化...首先,将9,9-二(3,5-二甲基-4-羟基苯基)芴(DMBHF)、9,9-双(4-羟苯基)芴(BHF)和4,4’-二氟二苯甲酮(DFB)在高温下缩聚,得到聚芴醚酮(PFEK-x)(x=30、40、50,x为DMBHF含量,以DFB的物质的量计,下同);接着,利用溴代反应将PFEK-x的甲基功能化为溴甲基;然后,通过4-羟基苯磺酸钠的SN2亲核取代制得具有不同离子交换容量的磺化聚芴醚酮(SPFEK-x);最后,通过溶液浇铸法成膜并酸化,制得新型低成本质子交换膜(PEMs)。采用^(1)HNMR、FTIR、TGA对其进行了表征,并对其性能进行了测试。结果表明,SPFEK-40膜具有较高的质子传导率及离子选择性、较低的钒离子渗透率及面电阻,综合性能优异。以SPFEK-40膜组装的全钒液流电池(VRFB)在电流密度为80 m A/cm^(2)时的能量效率为88.2%,高于以Nafion 212膜组装的VRFB的84.8%。此外,以SPFEK-40膜组装的VRFB在30次循环后放电容量保持率为84.3%,远高于以Nafion 212膜组装的VRFB(66.1%)。该合成路线的原料来源广泛,价格低廉,不涉及危险的磺化反应,易于工业放大。制得的SPFEK-x均具有良好的机械性能和氧化稳定性。展开更多
文摘This paper analyzed the material flow situation in argo-animal husbandry ecosystem by compartment model. This model was an important mean for investigating the whole structural characteristics in ecosystem. Based on this analysis, characteristics of material cycle and integrity in the system were mastered. As an example of natural conditions in Yonghe Village, Shuangcheng Township, Shuangeheng Municipal, Heilongjang Province, the system of linear differential equations in system was established by extracting each compartment and investigating material flow and stability of this model was proved by Lyapunov linear theory. The result showed that this system could not be interfered by initial value in the state of present, input and output.
文摘首先,将9,9-二(3,5-二甲基-4-羟基苯基)芴(DMBHF)、9,9-双(4-羟苯基)芴(BHF)和4,4’-二氟二苯甲酮(DFB)在高温下缩聚,得到聚芴醚酮(PFEK-x)(x=30、40、50,x为DMBHF含量,以DFB的物质的量计,下同);接着,利用溴代反应将PFEK-x的甲基功能化为溴甲基;然后,通过4-羟基苯磺酸钠的SN2亲核取代制得具有不同离子交换容量的磺化聚芴醚酮(SPFEK-x);最后,通过溶液浇铸法成膜并酸化,制得新型低成本质子交换膜(PEMs)。采用^(1)HNMR、FTIR、TGA对其进行了表征,并对其性能进行了测试。结果表明,SPFEK-40膜具有较高的质子传导率及离子选择性、较低的钒离子渗透率及面电阻,综合性能优异。以SPFEK-40膜组装的全钒液流电池(VRFB)在电流密度为80 m A/cm^(2)时的能量效率为88.2%,高于以Nafion 212膜组装的VRFB的84.8%。此外,以SPFEK-40膜组装的VRFB在30次循环后放电容量保持率为84.3%,远高于以Nafion 212膜组装的VRFB(66.1%)。该合成路线的原料来源广泛,价格低廉,不涉及危险的磺化反应,易于工业放大。制得的SPFEK-x均具有良好的机械性能和氧化稳定性。
