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New Camera Records Invisible Motion
The world around us is in constant motion, even objects that seem to be perfectly still. Researchers at the Massachusetts Institute of Technology use a special camera that offers glimpses into the world of seemingly invisible movements.
Many objects around us vibrate when hit by sound waves but the movements are invisible to the naked eye.
For instance, a wine glass exposed to a loud noise…..vibrates although it looks perfectly still.
However, if you tape the movements with a special high-speed camera that records thousands of frames per second, and use a computer program to amplify the vibrations and insert them in the video, the results are stunning. The so-called motion microscope makes the glass look like it's made of a jelly-like substance.
“The motion microscope is a way to visualize small motions that are seemingly invisible to the naked eye in videos,” said Massachusetts Institute of Technology graduate student Neil Wadhwa, who recorded and amplified the movements of a face, clearly showing the man’s blood pressure going up and down with every heartbeat.
Wadhwa says the motion microscope can be very useful for monitoring critical movements such as the movements of a baby in mother’s womb or of an infant breathing.
“You can create a non-contact vital signs monitor so you don't need to attach anything to a person and you will still be able to figure out their heart rate and respiration rate,” he said.
Wadhwa says recording invisible motion could be used for other applications, such as helping engineers detect vibrations of construction elements and even buildings, road bridges or construction cranes.
词语分析
socialism
困难程度：3星常用词语，属常用6000词
英汉讲解
n.社会主义
参考例句
用作名词
From then on we proceeded to build socialism.
从那时起,大家开始建设社会主义。
Who is the founder of the scientific socialism?
哪个是科学社会主义的奠基人？
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nursery
困难程度：3星常用词语，属常用6000词
英汉讲解
n.托儿所；保育室；苗圃
参考例句
用作名词
Many children under five go to nursery school.
5岁以下的很多儿童都上婴幼儿园。
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preserve
困难程度：4星核心词语，属常用3000词
英汉讲解
v.保护；保存；维持
n.禁猎区；蜜饯
参考例句
用作动词
It is highly important to preserve the environment.
保护自然环境至关要紧。
用作名词
No hunting is allowed in the preserve .
在禁猎区内不许狩猎。
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jail
困难程度：4星核心词语，属常用3000词
英汉讲解
n.监牢；监狱；拘留所
vt.监禁；下狱
参考例句
用作名词
On the other hand, at least he didn't leave his dinner on the floor of the county jail.
可是，从其次来讲，他至少没吐在拘留所的地板上。
用作及物动词
He can be punished by long jail sentences.
他可能遭到长期监禁的处罚。
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core
困难程度：4星核心词语，属常用3000词
英汉讲解
n.核心；果心；要素
vt.挖去果核
参考例句
用作名词
The core of our appeal is freedom of speech.
大家的需要的核心是言论自由。
This concept is at the very core of her theory.
这个定义是她理论的核心。
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naval
困难程度：3星常用词语，属常用6000词
英汉讲解
adj.海军的；军舰的
参考例句
用作形容词
It was unable to turn around at the West end of Chambers Field at the Norfolk Naval Station.
它是不可以在诺福克海军的车站室范围的西繁华区回过头的。
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capacity
困难程度：4星核心词语，属常用3000词
英汉讲解
n.容量；容积；能力；职位；资格
参考例句
用作名词
That bowl has a capacity of two pints.
那只碗的容量有两品脱。
She alone was in a capacity to begin the negotiation.
只有她有资格开始谈判。
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