时间:2019-01-20 作者:英语课 分类:2016年Scientific American(八)月


英语课

If you've gone shopping for a car lately, you might have noticed that fuel economy—the number of miles per gallon—is creeping up. One reason is a more efficient type of fuel injection, called gas direct injection. It’s a feature of half the new cars sold in the U.S. last year.


如果你最近买了一辆车,你可能已经注意到——燃油经济,每加仑行驶的总英里数正在蠕升。原因之一在于燃油喷射的效率更高,称为缸内喷气。这是去年所出售的一半新车所具有的一大特征。


"With that kind of engine design you can also introduce turbocharging—that's really what it comes down to: more engine power with a smaller engine." Naomi Zimmerman, an air-quality scientist at Carnegie Mellon University—who has never owned a car. "Probably because I did a whole PhD on engine emissions 1."


Here's how the two injection methods differ. In the old standard, called "port fuel injection," gas is injected into the air intake 2, where it mixes with air before hitting the cylinder 3. In direct injection though, as the name implies, the fuel is injected directly into the cylinder. It's more fuel efficient, meaning lower CO2 emissions, which will help slow climate change. But paradoxically, it also emits more particulate 4 matter, including black carbon, or soot 5—a pollutant 6 implicated 7 in global warming.


这种类型的引擎设计,也可以引进涡轮增压——这才是真正的原因——更小马力的引擎,更多的发动机功率。内奥米齐默尔曼,卡内基梅隆大学一名空气质量科学家——从未拥有一辆车。“可能是因为我博士研究生阶段做了关于发动机排放的整体研究。这是这两种喷射形式的不同之处。按照旧标准,称之为“气门式燃料喷射”,将气体注入进气口,在冲击汽缸之前与空气混合。然而,直接式燃料喷射,顾名思义,燃料直接注入汽缸,这样更省油,意味着较低的二氧化碳排放,这将有助于减缓气候变化。但是,与此相矛盾的是,也能喷射出更多的颗粒物。包括黑碳或煤灰——与全球变暖有直接关系的污染物。


Zimmerman and her colleagues analyzed 8 studies of direct injection engines to see how this pollution tradeoff works out for the climate. "The answer is that it's really complicated and it's not certain." But on average, she says, boosting fuel economy five to nine percent would probably cancel out the warming effects of black soot, and score a net positive for the climate. The findings are in the journal Environmental Science and Technology. [Naomi Zimmerman et al., Assessing the Climate Trade-Offs of Gasoline Direct Injection Engines]


齐默尔曼与她的研究团队对直喷式发动机的研究进行分析以查明这一污染权衡怎样使气候受益。“答案是,这真的很复杂,目前还不能确定。”但平均而言,她表示,将燃油经济性由5%提高到9%,可能会消除黑炭的暖化效应,整体而言对气候有益。该项研究结果发表在《环境科学与技术》杂志上。


The fuel economy goal might be different in places with big temperature swings, and where gasoline has more aromatic 9 compounds—which seem to boost black carbon emissions. One place that fits the bill: Canada. “There we might need to be closer to the 10 percent, 15 percent mark in terms of improving fuel economy. Which is actually a very aggressive increase in fuel economy."


燃油经济性目标可能在那些温度波动较大、汽油中含有更多芳香化合物的地方会有所不同——这似乎促进了黑碳排放。刚好符合要求的一个地方:加拿大。在这里,就改善燃油经济性而言,我们可能需要将其提高接近10%,15%,这的确是燃油经济性的巨大极高。


She says one solution that might reduce black carbon emissions is gasoline particulate filters. Which would also screen out particulate matter dangerous to human health. Meaning a win for the planet—and the people who live on it.


她表示减少黑碳排放的一个可行的解决方案是汽油颗粒过滤器,它也可以筛选出对人类健康有危害的颗粒物。这意味着赢得了这个星球——并且人们在这个星球上生活。



排放物( emission的名词复数 ); 散发物(尤指气体)
  • Most scientists accept that climate change is linked to carbon emissions. 大多数科学家都相信气候变化与排放的含碳气体有关。
  • Dangerous emissions radiate from plutonium. 危险的辐射物从钚放散出来。
n.吸入,纳入;进气口,入口
  • Reduce your salt intake.减少盐的摄入量。
  • There was a horrified intake of breath from every child.所有的孩子都害怕地倒抽了一口凉气。
n.圆筒,柱(面),汽缸
  • What's the volume of this cylinder?这个圆筒的体积有多少?
  • The cylinder is getting too much gas and not enough air.汽缸里汽油太多而空气不足。
adj.微小的;n.微粒,粒子
  • A special group was organized to dig up the particulate of the case.成立了一个专门小组来查明该案件的各个细节。
  • Lungs retain relatively insoluble particulate material.肺脏内留有不溶解的颗粒物质。
n.煤烟,烟尘;vt.熏以煤烟
  • Soot is the product of the imperfect combustion of fuel.煤烟是燃料不完全燃烧的产物。
  • The chimney was choked with soot.烟囱被煤灰堵塞了。
n.污染物质,散布污染物质者
  • Coal itself is a heavy pollutant.煤本身就是一种严重的污染物。
  • Carbon dioxide may not be a typical air pollutant.二氧化碳可能不是一种典型的污染物。
adj.密切关联的;牵涉其中的
  • These groups are very strongly implicated in the violence. 这些组织与这起暴力事件有着极大的关联。 来自《简明英汉词典》
  • Having the stolen goods in his possession implicated him in the robbery. 因藏有赃物使他涉有偷盗的嫌疑。 来自《现代汉英综合大词典》
v.分析( analyze的过去式和过去分词 );分解;解释;对…进行心理分析
  • The doctors analyzed the blood sample for anemia. 医生们分析了贫血的血样。 来自《简明英汉词典》
  • The young man did not analyze the process of his captivation and enrapturement, for love to him was a mystery and could not be analyzed. 这年轻人没有分析自己蛊惑著迷的过程,因为对他来说,爱是个不可分析的迷。 来自《简明英汉词典》
adj.芳香的,有香味的
  • It has an agreeable aromatic smell.它有一种好闻的香味。
  • It is light,fruity aromatic and a perfect choice for ending a meal.它是口感轻淡,圆润,芳香的,用于结束一顿饭完美的选择。
学英语单词
acoustic homing system
address matcher circuit
alphanumeric program
Anicetus
antirheumatoid drug
apparent turbulent stress tensor
aseptic filling
astronomic transit
atlee
automated batch mixing
Bac Giang, Tinh
bioconcentration
bistable polarization
branch coverage testing
brems
bus hut
cant rail
checking book
chrysanthemum leucanthemums
close-to-nature forestry
cobalt slass
coffee black beans
coodes
crested penguins
crystal-controlled
customer evaluation
daryosphere
diffused base transistor
distributed element
ditylenchus
externally-imposed
flower primordia
foresworn
full crystal
gateway charge
geographical classification of 8oils
guardlike
heteromorphic chromosomes
heterosperminous hybridization
histoimmunological
historical jurisprudence
horn cleat
hydroaluminations
iraqgates
knife tool
laughland
lent an ear to
liasons
limit of aperidicity
local buffer storage
lomasome
longitudinal dispersion
low transmission
mazatzal pk.
medical nomenclature
microcode assembler
mild-mannered
mine swept route
Mugila, Mts.
multispectral satellite data
noboes
obv
Osborne, L.
Paranari
patently
payment notice
Perisporiales
pick his steps
price plan
primary vaccination
protocollyris sauteri
pterygomandibular
Puusepp's reflex
raddicle
read-message
real-time data structure
recosting
reverse mottle
RNA probe
rosin adduct
scutellarin
segmented address space
spread for
sudor anglicus
Symes
symmetric game
tank clean-out opening
televisuality
the eight manifestations of infantile convulsion
theophanous
tisiyeh (tasiyeh)
torpedo bombardment aeroplane
tribenzylethyltin
trickle-irrigated
triphenoxazin
two for one twister
unquenches
versche
vica
wear resistant alloy steel
widely spaced stanchions
zapanta