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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.
詞匯解析
socialism
難度：3星常用詞匯，屬常用6000詞
英漢解釋
n.社會(huì)主義
參考例句
用作名詞 (n.)
From then on we proceeded to build socialism.
從那時(shí)起,我們開始建設(shè)社會(huì)主義。
Who is the founder of the scientific socialism?
誰是科學(xué)社會(huì)主義的奠基人？
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nursery
難度：3星常用詞匯，屬常用6000詞
英漢解釋
n.托兒所；保育室；苗圃
參考例句
用作名詞 (n.)
Many children under five go to nursery school.
5歲以下的許多兒童都上幼兒園。
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preserve
難度：4星核心詞匯，屬常用3000詞
英漢解釋
v.保護(hù)；保存；保持
n.禁獵區(qū)；蜜餞
參考例句
用作動(dòng)詞 (v.)
It is highly important to preserve the environment.
保護(hù)自然環(huán)境至關(guān)重要。
用作名詞 (n.)
No hunting is allowed in the preserve .
在禁獵區(qū)內(nèi)不許打獵。
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jail
難度：4星核心詞匯，屬常用3000詞
英漢解釋
n.監(jiān)牢；監(jiān)獄；拘留所
vt.監(jiān)禁；下獄
參考例句
用作名詞 (n.)
On the other hand, at least he didn't leave his dinner on the floor of the county jail.
可是，從另一方面來說，他至少?zèng)]有吐在拘留所的地板上。
用作及物動(dòng)詞 (vt.)
He can be punished by long jail sentences.
他可能受到長(zhǎng)期監(jiān)禁的處罰。
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core
難度：4星核心詞匯，屬常用3000詞
英漢解釋
n.核心；果心；要點(diǎn)
vt.挖去果核
參考例句
用作名詞 (n.)
The core of our appeal is freedom of speech.
我們的要求的核心是言論自由。
This concept is at the very core of her theory.
這個(gè)概念是她理論的核心。
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naval
難度：3星常用詞匯，屬常用6000詞
英漢解釋
adj.海軍的；軍艦的
參考例句
用作形容詞 (adj.)
It was unable to turn around at the West end of Chambers Field at the Norfolk Naval Station.
它是不能在諾福克海軍的車站室領(lǐng)域的西繁華區(qū)回過頭的。
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capacity
難度：4星核心詞匯，屬常用3000詞
英漢解釋
n.容量；容積；能力；職位；資格
參考例句
用作名詞 (n.)
That bowl has a capacity of two pints.
那只碗的容量有兩品脫。
She alone was in a capacity to begin the negotiation.
只有她有資格開始談判。
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