Some noticeable effects of process conditions, such as coagulation bath, solvent extraction, drying shrinkage and ultra-drawing, on the structure and properties of gel-spun PVA fibers are studied and discussed. High s...Some noticeable effects of process conditions, such as coagulation bath, solvent extraction, drying shrinkage and ultra-drawing, on the structure and properties of gel-spun PVA fibers are studied and discussed. High strength and high modulus PVA fibers with tensile strength of 11.3 cN / dtex and initial modulus of 430 cN / dtex have been obtained.展开更多
This study proposes polyvinyl alcohol–potassium iodide(PVA–KI)as a novel gel chemical probe.The probe uses the reactions among PVA,KI,water,borax,and oxidative species to visualize the distribution of reactive speci...This study proposes polyvinyl alcohol–potassium iodide(PVA–KI)as a novel gel chemical probe.The probe uses the reactions among PVA,KI,water,borax,and oxidative species to visualize the distribution of reactive species.This method provides information regarding the distribution of reactive species by coloration on the gel surface.The effects of the surrounding gas phase on the distribution and diffusion of the reactive species are also investigated using the PVA–KI gel probe.Further,the relationship between the irradiation distance and reactive species diffusion is determined on the surface of the PVA–KI probe with and without plastic shielding.Adjusting the irradiation distance appropriately leads to an increase in the modified area as detected by the PVA–KI gel probe analysis.The relative concentration distributions of the reactive species are also obtained from visualized color distributions measured using a colorimeter.Furthermore,reactive species generation by long-scale line plasma is confirmed by the color reaction on the PVA–KI gel surface,with a greater area being covered by an atmospheric-pressure pulsed microwave line plasma source.展开更多
文章以粒径为5 mm的聚乙烯醇(PVA)凝胶颗粒为生物载体,研究其对厌氧污泥颗粒化进程及反应器运行效果的影响。在PVA颗粒污泥初成体形成的情况下,UASB反应器连续运行74 d。试验结果表明:经过32 d的培养,得到沉降性能优良的PVA颗粒污泥,反...文章以粒径为5 mm的聚乙烯醇(PVA)凝胶颗粒为生物载体,研究其对厌氧污泥颗粒化进程及反应器运行效果的影响。在PVA颗粒污泥初成体形成的情况下,UASB反应器连续运行74 d。试验结果表明:经过32 d的培养,得到沉降性能优良的PVA颗粒污泥,反应器COD去除率高达97%,容积负荷由1.05 kg COD·m-3d-1提升至13.33 kg COD·m-3d-1,水力停留时间由35 h缩短至8 h;运行结束时,COD去除率稳定在90%左右,容积负荷达到13.54 kg COD·m-3d-1。通过扫描电镜观察到成熟PVA颗粒污泥外表面丝状菌上交联生长着杆菌、球菌,内部主要附着丝状菌。展开更多
文摘Some noticeable effects of process conditions, such as coagulation bath, solvent extraction, drying shrinkage and ultra-drawing, on the structure and properties of gel-spun PVA fibers are studied and discussed. High strength and high modulus PVA fibers with tensile strength of 11.3 cN / dtex and initial modulus of 430 cN / dtex have been obtained.
基金partially supported by the ZE Research Program IAE(No.ZE2021B-27)the joint usage/research program cLPS(No.21020)。
文摘This study proposes polyvinyl alcohol–potassium iodide(PVA–KI)as a novel gel chemical probe.The probe uses the reactions among PVA,KI,water,borax,and oxidative species to visualize the distribution of reactive species.This method provides information regarding the distribution of reactive species by coloration on the gel surface.The effects of the surrounding gas phase on the distribution and diffusion of the reactive species are also investigated using the PVA–KI gel probe.Further,the relationship between the irradiation distance and reactive species diffusion is determined on the surface of the PVA–KI probe with and without plastic shielding.Adjusting the irradiation distance appropriately leads to an increase in the modified area as detected by the PVA–KI gel probe analysis.The relative concentration distributions of the reactive species are also obtained from visualized color distributions measured using a colorimeter.Furthermore,reactive species generation by long-scale line plasma is confirmed by the color reaction on the PVA–KI gel surface,with a greater area being covered by an atmospheric-pressure pulsed microwave line plasma source.
文摘文章以粒径为5 mm的聚乙烯醇(PVA)凝胶颗粒为生物载体,研究其对厌氧污泥颗粒化进程及反应器运行效果的影响。在PVA颗粒污泥初成体形成的情况下,UASB反应器连续运行74 d。试验结果表明:经过32 d的培养,得到沉降性能优良的PVA颗粒污泥,反应器COD去除率高达97%,容积负荷由1.05 kg COD·m-3d-1提升至13.33 kg COD·m-3d-1,水力停留时间由35 h缩短至8 h;运行结束时,COD去除率稳定在90%左右,容积负荷达到13.54 kg COD·m-3d-1。通过扫描电镜观察到成熟PVA颗粒污泥外表面丝状菌上交联生长着杆菌、球菌,内部主要附着丝状菌。
