首页
外语
计算机
考研
公务员
职业资格
财经
工程
司法
医学
专升本
自考
实用职业技能
登录
考研
Scraps of food could soon be helping power your home, thanks to an ultra-cheap bacteria-driven battery. Its developers hope that
Scraps of food could soon be helping power your home, thanks to an ultra-cheap bacteria-driven battery. Its developers hope that
admin
2010-01-13
46
问题
Scraps of food could soon be helping power your home, thanks to an ultra-cheap bacteria-driven battery. Its developers hope that instead of feeding the dog or making garden compost(混合肥料) ,organic household waste could top up your home’s electricity.
Although such "microbial fuel cells" (MFCs)have been developed in the past, they have always proved extremely inefficient and expensive. Now Chris Melhuish and technologists at the University of the West of England(UWE)in Bristol have come up with a simplified MFC that costs as little as £10 to make.
Right now, their fuel cell runs only on sugar cubes, since these produce almost no waste when broken down, but they aim to move on to carrot power. "It has to be able to use raw materials, rather than giving it a refined fuel," says Melhuish.
Inside the Walkman-sized battery, a colony of E. coil bacteria produce enzymes that break down carbohydrates, releasing hydrogen atoms. The cell also contains chemicals that drive a series of redox, or reduction and oxidation reactions, stripping electrons from the hydrogen atoms and delivering them steadily to the fuel cell’s anode(正极). This creates a voltage that can be used to power a circuit.
To prove the MFC works, the researchers are using it to power a small light-sensitive robot. And when a number of the cells are connected in series, they could power domestic appliances, running a 40-watt bulb for eight hours on about 50 grams of sugar.
Earlier MFCs were inefficient because they relied on energy-hungry filters and pumps. By experimenting with different anode materials, the UWE team have figured out how to make their system work: they dump the bacteria and redox chemicals directly into the cell.
In its current form, the UWE team says its organic battery can produce eight times as much power as any previous MFC. But Melhuish wants to improve this, both by scaling it up and finding a better mix of redox chemicals.
Earlier MFCs were inefficient because they ______.
选项
A、produced very little electricity
B、required different anode materials
C、consumed much energy on filters and pumps
D、could only run domestic appliances
答案
C
解析
本题是具体细节题。答案可以在第6段第1句话because they relied on energy-hungry filters and pumps中找到。
转载请注明原文地址:https://kaotiyun.com/show/Dimi777K
0
在职申硕(同等学力)英语
相关试题推荐
SomeofthesestudiesAhaveshownthatalthoughsomepeoplehavetroubleBtofallasleep,othershaveCanequallydifficulttime
Formillionsofyearsbeforetheappearanceoftheelectriclight,shiftwork,all-nightcableTVandtheInternet,theEarth’s
Therearehiddenfactorswhichscientistscall"feedbackmechanisms".Nooneknowsquitehowtheywillinteractwiththechangin
Therearehiddenfactorswhichscientistscall"feedbackmechanisms".Nooneknowsquitehowtheywillinteractwiththechangin
Doesbrainpower______aswegetolder?Scientistsnowhavesomesurprisinganswers.
Wilmutmaintainsthatcloninganimalshastremendouspotentialforhelpingpeople.ClonedSheep,hesays,couldbeusedaslivin
Wilmutmaintainsthatcloninganimalshastremendouspotentialforhelpingpeople.ClonedSheep,hesays,couldbeusedaslivin
ThanksgivingDayisanannualholidaycelebratedintheUnitedStatesonthefourthThursdayinNovember,anditismostclosely
Hehastroubleunderstandingthatotherpeoplejudgehimbyhissocialskillsandconduct.
随机试题
IknewIcouldnotfinishmyhomework
可致成年病人发出惊呼的原因有
患者,女性,36岁,入院前半月发热、咽痛,热退5天后感乏力、恶心、呕吐、少尿,体检:血压168/100mmHg,贫血貌,双下肢水肿,呼吸深长,心脏临界大小,实验室检查:血红蛋白60g/L,尿蛋白(++),血尿素氮41mmol/L,肌酐1002μmol/L,
患儿面色蜡黄,手有震颤,血红细胞3×1012/L,血红蛋白8g/L。血片中红细胞形态大小不等,以大红细胞为多。首先考虑
在甲自诉乙伤害,乙反诉甲诽谤的案件中,谁负有举证责任?
下列关于国民经济和社会发展规划咨询应遵循的基本原则中,不包括()。
采用一元线性回归的方法分析预测规划期城市人口规模的主要依据是()。
制定工程量清单的项目设置规则是为了统一工程量清单的()。
关于进行工作分析时所使用的访谈法的说法,正确的是()。
对培训效果进行评估。评估单位应为()。
最新回复
(
0
)