California Gives Green Light to Space Solar Power
Energy beamed down from space is one step closer to reality,now that California has given the green light to an agreement that would see the Pacific Gas and Electric Company buy 200 megawatts(兆瓦)of power beamed down from solar-power satellites beginning in 2016.But some major challenges will have to be overcome if the technology is to be used widely.
A start-up company called Solaren is designing the satellites,which it says will use radio waves to beam energy down to a receiving station on Earth.
The attraction of collecting solar power in space is the almost uninterrupted sunshine available in geosynchronous(与地球同步的)orbit.Earth-based solar ceils,by contrast,can only collect sunlight during daytime and when skies are clear.
But space.based solar power must grapple(努力克服)with the high cost per kilogram of launching things into space,says Richard Schwartz of Purdue University in West Lafayette,Indiana.“If you're talking about it being economically viable for power of the Earth,it's a tough go,”he says.
Cal Boerman,Solaren's director of energy services,says the company designed its satellites with a view to keeping launch costs down.“We knew we had to come up with a different,revolutionary design,” he says.A patent the company has won describes ways to reduce the system's weight,including using inflatable mirrors to focus sunlight on solar cells,so a smaller number can collect the same amount of energy.
But using mirrors introduces other challenges,including keeping the solar cells from overheating,says Schwartz.“You have to take care of heat dissipation(散发)because you're now concentrating a lot of energy in one place,”he says.According to the company's patent,Solaren's solar cells will be connected to radiators to help keep them cool.
Though Boerman says the company believes it can make space-based solar power work,it is not expecting to crowd out other forms of renewable energy.Laws in California and other states require increasing use of renewable energy in coming years,he points out.“To meet those needs,we're going to need all types of renewable energy sources,”he says.
Solar-power satellites will use radio waves to beam energy down from space.
A.Right
B.Wrong
C.Not mentioned
第1题
颈部污染伤口,达24小时,清创后伤口一期缝合,伤口愈合优良,属于
A.切口分类愈合Ⅱ甲
B.切口分类愈合I甲
C.切口分类愈合Ⅲ甲
D.切口分类愈合Ⅱ丙
E.切口分类愈合Ⅱ乙
第4题
关于清洁伤口的方法,下列哪项是错误的
A.指无菌手术切口
B.清洁伤口缝合后一般能达到到-期愈合
C.清洁伤口可以直接缝合
D.胃大部切除术后的切口属清洁伤口
E.某些污染切口经处理后可使其成为清洁伤口
第5题
关于清洁伤口的方法,下列哪项是错误的
A.指无菌手术切口
B.清洁伤口缝合后一般能达到到-期愈合
C.清洁伤口可以直接缝合
D.胃大部切除术后的切口属清洁伤口
E.某些污染切口经处理后可使其成为清洁伤口
第6题
II-甲,与该切口分类和愈合分级相符的是()A.甲状腺大部切除术后伤口愈合良好
B.胃次全切除术后伤口愈合良好
C.胆囊切除术后伤口有硬结,但未化脓
D.阑尾穿孔切除术后伤口化脓
E.横结肠癌根治术后切口裂开
III-丙,与该切口分类和愈合分级相符的是()A.甲状腺大部切除术后伤口愈合良好
B.胃次全切除术后伤口愈合良好
C.胆囊切除术后伤口有硬结,但未化脓
D.阑尾穿孔切除术后伤口化脓
E.横结肠癌根治术后切口裂开
I-甲,与该切口分类和愈合分级相符的是()A.甲状腺大部切除术后伤口愈合良好
B.胃次全切除术后伤口愈合良好
C.胆囊切除术后伤口有硬结,但未化脓
D.阑尾穿孔切除术后伤口化脓
E.横结肠癌根治术后切口裂开
请帮忙给出每个问题的正确答案和分析,谢谢!
第7题
右胫腓骨开放骨折,清创内固定后切口愈合良好
A.切口分类及愈合记录为“I/甲”
B.切口分类及愈合记录为“Ⅲ/丙”
C.切口分类及愈合记录为“Ⅱ/甲”
D.切口分类及愈合记录为“Ⅱ/乙”
E.切口分类及愈合记录为“Ⅲ/甲”
第8题
右胫腓骨开放骨折,清创内固定后切口愈合良好
A.切口分类及愈合记录为“l/甲”
B.切口分类及愈合记录为“Ⅲ/丙”
C.切口分类及愈合记录为“Ⅱ/甲”
D.切口分类及愈合记录为“Ⅱ/乙”
E.切口分类及愈合记录灯“Ⅳ/甲”
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