手机APP下载

您现在的位置: 广东快乐十分 > 在线广播 > 科学美国人 > 科学美国人地球系列 > 正文

科学美国人60秒:对蚂蚁来说 天空就是它们的指南针

来源:可可英语 编辑:aimee    |  可可官方微信:ikekenet
 下载MP3到电脑  批量下载MP3和LRC到手机
加载中..
)Rk1c1]uKikfYi

_U-kWzlS!yG^9#1dib

This is Scientific American's 60-second Science, I'm Christopher Intagliata.
GPS has completely transformed how we get around. But other animals have long had their navigation systems built right in—like ants and bees.
"We know their eyes are quite sensitive to polarized light, and the sky has a particular pattern of polarized light, relative to the position of the sun." Barbara Webb, a bioroboticist at the University of Edinburgh.
You can see polarized light firsthand if you take a pair of polarized sunglasses and rotate them against the sky—the light passing through the lenses changes. Webb says the insects have polarization like that built into facets of their compound eyes.
"You can think of it as the equivalent of having a little polarization directional filter over them or lots of sunglasses pointed in different directions."

|w^Fs-3I+]~X#BR5d8

蚂蚁.jpg
But Webb was curious whether there's really enough information in the sky to give insects an accurate sense of direction. So her team built a sensor modeled after a desert ant eye and put it under artificial light meant to simulate the sky. They then fed that sensor input into a computational model meant to mimic the brains of desert ants, crickets and other insects with a celestial compass.
And they found that with the insects' innate sensing and processing equipment, they can likely sense compass direction down to just a couple degrees of error. The results are in the journal PLOS Computational Biology.
A system based on that of insects could someday be a cheap, low-energy alternative to GPS. "Insects have very tiny brains. A brain the size of a pinhead that's using hardly any energy. And yet they're still able to navigate better than we can with GPS, which is a huge infrastructure."
Webb is now working on building a robot that can, like the desert ant, use light to get its bearings. Although after sundown, it may have to ask for directions.
Thanks for listening for Scientific American — 60-Second Science. I'm Christopher Intagliata.

&(ZsU(bV2u*&r

R&LM)aF~[iKr

me5zbRXk1I|9Hf,(hPF;=r&VTGJ^iKg6xIo665&ZLwL#|@(

重点单词   查看全部解释    
navigate ['nævi。geit]

想一想再看

vi. 航行,驾驶,操纵 vt. 航行,驾驶

联想记忆
amiable ['eimjəbl]

想一想再看

adj。 和蔼的,亲切的

联想记忆
mimic ['mimik]

想一想再看

adj。 模仿的,假的 [计算机] 模拟的 vt。 模仿

 
circumstance ['sə:kəmstəns]

想一想再看

n。 环境,(复数)境况,事件,详情

联想记忆
sensitive ['sensitiv]

想一想再看

广东快乐十分adj. 敏感的,灵敏的,易受伤害的,感光的,善解人意的

联想记忆
accurate ['ækjurit]

想一想再看

adj. 准确的,精确的

联想记忆
rigorous ['rigərəs]

想一想再看

adj。 严厉的,严酷的,严格的,细致的

联想记忆
pattern ['pætən]

想一想再看

n. 图案,式样,典范,模式,型
v. 以图案

 
fondness ['fɔndnis]

想一想再看

n。 爱好,溺爱,喜爱 n。 蠢事

 
pleasing ['pli:ziŋ]

想一想再看

adj. 令人愉快的,讨人喜爱的 动词please的现在

 


关键字: 科学美国人 GPS 蚂蚁

发布评论我来说2句

    特别推荐

      ·
      ·
      ·
      ·

    最新文章

    可可英语官方微信(微信号:ikekenet)

    每天向大家推送短小精悍的英语学习资料.

    添加方式1.扫描上方可可官方微信二维码。
    添加方式2.搜索微信号ikekenet添加即可。
    秒速时时彩 吉利分分彩 快3正规平台 秒速赛车网站 大乐透 秒速赛车官方网站 秒速赛车网站 秒速赛车官方网站 时时彩注册 秒速赛车