- UID
- 1513435
- 在线时间
- 小时
- 注册时间
- 2022-2-7
- 最后登录
- 1970-1-1
- 主题
- 帖子
- 性别
- 保密
|
p1, 18世纪末英国和法国争夺海上霸主,英国win--copper covering(expensive but paid off)--release toxic copper ions to stop barnacles, mussels...
p2, ship-fouling, fuel comsumption up by 40%--when drag by a barnacle
solution--poison, copper-coating paint--tin, release toxic but illegal--search alternatives.
p3, 1, avemectins--also stunt their growth.---barnacle can not bind, others can not affected.
2, polymer molecules(water-)--barnacles and mussels hard to stick
p4, alternative for 2, smooth surface--fluoropolymer---can attach, but when vessel moves faster, the water sweeps them away.
OK for commercial vessels, but not pleasure boats.--trying to improve
p5, small boats--a mixture
p6, fouling--less problem in fresh water, coz barnacles are marine. but mussels are.
e.g. North America, the mixture--effective, yet commericalize
p7, aim--stop them spreading, both can survive out of water for severl days, can not be killed.
and hard to see
p8, a lot to play for--save fuel save money, and cutting greenhouse-gas emissions.
stop the spread, life easier for America and Canada
the prize--not world domination, but become rich.
duel, 决斗,斗争
ion 离子
admiral 舰队司令,海军上将
mussel 淡菜,蚌
fouling, (水管、枪筒等中的)污垢
rife, 流行的;普遍的;盛传的
barnacle,藤壶
deligent 勤奋的, 勤勉的 |
|