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El Ultimo Grito - A Rematerialisation of Systems: Industries
www.z33.be/en/artworks/el-ultimo-grito-rematerialisation-...
photo (c) Kristof Vrancken / Z33
A seven year old boy playing the cornet busking on the main square of Brugge, Belgium whilst a young Asian admirer looks on.
Copyright © Peter van Heun. All rights reserved. Please do not use this photograph without my written consent.
Contact: info@petervanheun.nl
Artur - son of Leszek Blanik
taken at farewell ceremony - Leszek Blanik - Final Jump
29 may 2010, Gdańsk
My future firefighter going out on Halloween night. We went to a trunk or treat at a local church. Lakeland Fire Dept E-12 was there. They liked my son's choice for a Halloween Custom. They let my son and I take as many pictures as we wanted too. They told him, it's your engine. Thanks to Lakeland FD.
Come on, folks. Check this out.... Look at the form. Look at the follow-through. Not much of a picture, but she's got skills. AND SHE'S NOT EVEN THREE YET!!! If there are any college scouts out there, we'll gladly accept early-enrollment scholarships for any D1 school...
I got some WM swag from my visit ... a nifty little trash can that I believe is intended as a pencil holder. Holden paired it with his trash truck (already existing in the "garage") for a full day of fantasy play, landfill-style.
The first National Policy Dialogue on Future of Work organized on 13 December in Hanoi by the International Labour Organization
©ILO
This work is licensed under the Creative Commons Attribution‐NonCommercial‐NoDerivs 3.0
IGO License. To view a copy of this license, visit creativecommons.org/licenses/by‐nc‐
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Walt Disney World Resort in Florida.
May 2016.
Visit www.TwoLostBoys.com to follow all our travel adventures!
電漿球(Plasma Ball)
什麼是電漿?
電漿球的高壓是直流還是交流?是什麼元件產生高壓?
玻璃球內的氣體壓力很低。為什麼?
內部為什麼會有閃電?
手觸摸玻璃球,會有什麼現象?為什麼?
為什麼被電到,但沒有危險性?
日光燈管靠過去,為什麼燈管會亮?
為什麼手抓到長日光燈管的哪,就亮到哪?
日光燈管的原理?
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這樣也會亮~
把電漿球拔起來,只剩底座,燈管靠近,還是會亮。
電漿球是一個抽真空的玻璃球,內部充填著低壓的惰性氣體,中央金屬球接上高電壓,插上110V的電源之後,內部氣體因為高壓而產生放電火花,形成一條條有顏色的光線,看起來像閃電的形狀。填充的氣體種類不同,光線的顏色也不同,除氣體種類外,電流大小及球內氣壓也會影響電漿球發出的顏色。
將手放在電漿球上,球內閃電會往手集中。若第二個人去碰觸手摸電漿球的人,會有被電到的感覺。把硬幣放在電漿球頂部,用手去碰觸,也會有被電到的感覺,還可以看到火花喔!
電漿球通常是用高頻交流電或高頻脈衝式直流電,其電壓高達數千至一萬伏特,頻率則可能高達數十千赫,但電流小,可能小到一毫安培以下,因電流小,人體雖然有被電擊的感覺,但沒有危險。
將日光燈管靠近電漿球,發現燈管亮了,那是因為電漿球的底座的高電壓使得日光燈管裡的汞(水銀)激發產生光,這些光打在塗在燈管壁上的螢光劑,發出像日光一樣的白光。如果日光燈管內所塗的螢光劑種類不同,就會發出不同顏色的光。因此,把電漿球燈泡拔起來,只用底座,還是會讓靠近的日光燈管亮起來的。
memo.cgu.edu.tw/yun-ju/cguweb/phychiu/H301StaticElectric/...