The present work describes microstructure, texture, mechanical and ballistic properties correlation of a hot rolled and peak aged AA-7017 alloy plate at surface and centre. Both the microstructures and textures are di...The present work describes microstructure, texture, mechanical and ballistic properties correlation of a hot rolled and peak aged AA-7017 alloy plate at surface and centre. Both the microstructures and textures are different on the surface and centre of the plate. The surface of the plate shows recrystallized grains and a weak over all texture. The centre of the plate displays elongated grains and a sharp texture. Tensile properties, hardness and impact toughness are evaluated at surface and centre of the plate. It is observed that strength and hardness is high at centre, whereas ductility and impact toughness is more at the surface. Ballistic properties of the plate at centre and surface are measured by impacting against two different 7.62 mm deformable projectiles. The plates impacted on the surface shows better ballistic resistance. Ballistic performance of the plate at surface and centre has been correlated with the microstructure, texture and mechanical properties.展开更多
For a city with a car based transportation system and a highway within the system, the highway has a negative impact on the city＇s skyline and landscape. The Seoul Metropolitan Government has decided to regenerate ra...For a city with a car based transportation system and a highway within the system, the highway has a negative impact on the city＇s skyline and landscape. The Seoul Metropolitan Government has decided to regenerate rather than to dismantle the old overpass. This is one way to recycle old highways as attempted by other cities. This study has assessed the Seoul Station Overpass regeneration project, namely Seouilo 7017, in terms of the space utilization, barrier free design, amenities and accessibility. As fundamental research on the overpass regeneration, this study provides the necessary information and experience to other similar projects.展开更多
采用菌丝生长速率法测定了氯啶菌酯、苯醚甲环唑及其混配制剂对葡萄炭疽病菌和穗轴褐枯病菌菌丝生长的抑制活性,并用孙云沛法测定了混配制剂的共毒系数(CTC)。结果表明:氯啶菌酯抑制葡萄炭疽病菌和穗轴褐枯病菌菌丝生长的抑制中浓度(EC5...采用菌丝生长速率法测定了氯啶菌酯、苯醚甲环唑及其混配制剂对葡萄炭疽病菌和穗轴褐枯病菌菌丝生长的抑制活性,并用孙云沛法测定了混配制剂的共毒系数(CTC)。结果表明:氯啶菌酯抑制葡萄炭疽病菌和穗轴褐枯病菌菌丝生长的抑制中浓度(EC50值)分别为2.1793和1.1274μg/mL,而苯醚甲环唑的EC50值分别为0.6667和0.1041μg/mL。当氯啶菌酯与苯醚甲环唑按10∶1混配时复配制剂抑制这2种病原菌菌丝生长的CTC最高,增效作用最大。田间试验结果显示:试制样品22%氯啶菌酯.苯醚甲环唑EC(20%氯啶菌酯+2%苯醚甲环唑)以90～120 g a.i./hm2喷药2～3次对葡萄黑痘病、霜霉病、炭疽病均有较高的防治效果。展开更多
文摘The present work describes microstructure, texture, mechanical and ballistic properties correlation of a hot rolled and peak aged AA-7017 alloy plate at surface and centre. Both the microstructures and textures are different on the surface and centre of the plate. The surface of the plate shows recrystallized grains and a weak over all texture. The centre of the plate displays elongated grains and a sharp texture. Tensile properties, hardness and impact toughness are evaluated at surface and centre of the plate. It is observed that strength and hardness is high at centre, whereas ductility and impact toughness is more at the surface. Ballistic properties of the plate at centre and surface are measured by impacting against two different 7.62 mm deformable projectiles. The plates impacted on the surface shows better ballistic resistance. Ballistic performance of the plate at surface and centre has been correlated with the microstructure, texture and mechanical properties.
文摘For a city with a car based transportation system and a highway within the system, the highway has a negative impact on the city＇s skyline and landscape. The Seoul Metropolitan Government has decided to regenerate rather than to dismantle the old overpass. This is one way to recycle old highways as attempted by other cities. This study has assessed the Seoul Station Overpass regeneration project, namely Seouilo 7017, in terms of the space utilization, barrier free design, amenities and accessibility. As fundamental research on the overpass regeneration, this study provides the necessary information and experience to other similar projects.
文摘采用菌丝生长速率法测定了氯啶菌酯、苯醚甲环唑及其混配制剂对葡萄炭疽病菌和穗轴褐枯病菌菌丝生长的抑制活性,并用孙云沛法测定了混配制剂的共毒系数(CTC)。结果表明:氯啶菌酯抑制葡萄炭疽病菌和穗轴褐枯病菌菌丝生长的抑制中浓度(EC50值)分别为2.1793和1.1274μg/mL,而苯醚甲环唑的EC50值分别为0.6667和0.1041μg/mL。当氯啶菌酯与苯醚甲环唑按10∶1混配时复配制剂抑制这2种病原菌菌丝生长的CTC最高,增效作用最大。田间试验结果显示:试制样品22%氯啶菌酯.苯醚甲环唑EC(20%氯啶菌酯+2%苯醚甲环唑)以90～120 g a.i./hm2喷药2～3次对葡萄黑痘病、霜霉病、炭疽病均有较高的防治效果。
