什么是AAPT？

AAPT High School Physics Photo Contest美國高中生物理攝影大賽由美國物理教師協(xié)會(huì)AAPT主辦，該競賽旨在激發(fā)學(xué)生學(xué)習(xí)的興趣，同時(shí)讓學(xué)生們感受到大自然和生活中物理的美。同時(shí)也為教師和學(xué)生提供了一個(gè)通過視覺和文字形式了解自然和人為情況背后物理學(xué)的機(jī)會(huì)，將藝術(shù)的審美和物理的神秘相結(jié)合。

01、比賽信息

適合學(xué)生

9-12年級(jí)，對(duì)物理、攝影感興趣，英語基礎(chǔ)較好的同學(xué)們，均可投稿參賽。

比賽時(shí)間

報(bào)名投稿截止時(shí)間：2022年5月9日

報(bào)名費(fèi)用

180元/件作品

02、作品種類

?? Natural photos自然類照片：日常生活中自然出現(xiàn)的包含物理原理的照片

?? Contrived photos設(shè)計(jì)類照片：通過人為設(shè)計(jì)從而展現(xiàn)特定物理概念的照片

03、作品要求

???以表達(dá)物理現(xiàn)象和原理為內(nèi)涵，凡自然發(fā)生或創(chuàng)意安排的現(xiàn)象所拍攝的圖片均可，用少于250字的篇幅說明有關(guān)圖片所表達(dá)的物理現(xiàn)象；每張照片要包含一個(gè)標(biāo)題。

???高分辨率的照片，可以被清晰的放大至10寸照片大小（至少800萬像素）。

???參賽作品必須為原創(chuàng)作品，且不得通過電腦合成或者PS。

04、評(píng)分標(biāo)準(zhǔn)

??ASDAN中國辦公室將會(huì)從所有收到的照片里選出100個(gè)最高分作品（50個(gè)自然類和50個(gè)設(shè)計(jì)類）送至AAPT協(xié)會(huì)進(jìn)行復(fù)賽（評(píng)分中圖片中所反映的物理現(xiàn)象占60%，照片相對(duì)應(yīng)的文字描述占40%）。

??AAPT協(xié)會(huì)會(huì)根據(jù)送來的作品進(jìn)行進(jìn)一步的評(píng)選，評(píng)選出最后的獲勝者

05、獎(jiǎng)項(xiàng)設(shè)置中國區(qū)競賽

?自然類照片：前三名

?設(shè)計(jì)類照片：前三名

全球總競賽

?全球自然類照片：前三名

?全球設(shè)計(jì)類照片：前三名

?全國優(yōu)秀照片：前50名

（所有參賽選手都會(huì)獲得參與證書，所有獲獎(jiǎng)選手會(huì)另外獲得對(duì)應(yīng)獎(jiǎng)項(xiàng)的證書）

06、部分獲獎(jiǎng)作品

Author:?SHIYU CUI

School:?Camford Royal School

Type:?Contrived

Title:?The Fantastic Karmen Vortex Street

Description:?In fluid dynamics, a Kármán vortex street is a recurring pattern of whirling vortices created by vortex shedding, which is responsible for the unstable separation of flow around blunt things. It is named for the engineer and fluid dynamicist Theodore von Kármán and is responsible for phenomena such as the "singing" of suspended telephone or power wires and the vibration of an automobile antenna at certain speeds.

In the diagram, the ink is dropped into the water and the Kamen vortex can be seen to form by sliding the ink with a wooden stick. The ink is split into two streams by the stick, as the two streams are not perfectly symmetrical from side to side at any time. Because the higher the velocity of the fluid, the lower the pressure, so there must be a high pressure in one stream and a low pressure in the other. This causes the higher pressure stream to move towards the lower pressure stream until the pressure equilibrates. Therefore the vortex causes detachment and movement from the high pressure area to the low pressure area, the vortex also expands and diverges. As it continues, resulting in the Karmen vortex phenomenon, which form two asymmetrical streams continue to flow in a vortex alternatively. Due to the limited size of the bowl, the flow receives interference from the edges and the Karmen vortex effect is not very pronounced.

Author:?JonATHAN XUFENG HU

School:?Shanghai High School International Division

Type:?Contrived

Title:?Rainbow Flames on Soap Bubble

Description:This picture shows a soap bubble film under the light. The bubble film reflects a variety of different colors, forming a unique and beautiful rainbow pattern. This has resulted from a phenomenon known as thin-film interference. The soap bubble is a thin 3-layered film: the top and bottom are two layers of soap, and a layer of water is sandwiched between them. The thickness of this film is similar to the wavelengths of visible light. When light hits the soap bubble, the light that reflects from the top and bottom layers of soap interferes with each other. When the thickness of the bubble is just right, the two reflected lights constructively interfere to be brighter for some colors (in-phase), while reflected lights of other colors (out of phase) destructively interfere to be dimmer. This results in you seeing different colors on the bubble depending on the thickness of the bubble. In this photo, because of gravity, the thickness of the soap bubble increases towards the bottom, varying the colors reflected, producing a rainbow pattern. In addition, the photo shows that the color bands are more compact towards the lower end of the bubble. This is because gravity causes a constant acceleration on the film, leading to the rate of change of the film thickness increasing down the film. When taking the picture, viewing the bubble from different angles also changes the color seen, because of a phenomenon known as iridescence caused by the interference of light waves.