1. EI Nino is a shift in ocean temperatures and atmospheric conditions in the tropical Pacific that disrupts weather around the world. It all stats when eastern Pacific winds head west, plowing ocean water in front of then. When these winds ease, the waves return east, pushing down the thermocline, a layer of cool water that normally dilutes the warmer ocean surface. As surface temperatures rise, weather patterns change. But EI Nino eventually brings about its own destruction. When the waves bounce off South America an then Asia once again, their impact is inverted. As a result, the thermocline is pushed up, and the ocean’s surface cools. That gives rise to LA Nina , whose mods may be just the opposite of those shown by her timperatental brother. Heat waves may turn into cold spells and droughts into deluges.
Over the next few years, researchers hope to shed light not only on EI Nino’s past but on its future as well. For if the atmosphere warms because of the buildup of greenhouse gases, the EI Nino cycle could very well change. But how? Would it speed up, show down or stop entirely?
Given the present state of knowledge, no one can tell for sure. We will never have a complete picture of the planet’s complex, unpredictable climate patterns, but as this scientific quest moves forward, we could get useful glimpses of what lies ahead.
２．Hydraulic systems can be used to lift heavy weights using little force. This is because a 100-gram object resting on a piston with a cross section of one square centimeter produces the same pressure as a one-ton weight on a piston of one square meter. A hydraulic car jack uses the principle to raise a car by hand, pumping oil into a large cylinder that carries the weight of the car. Little force is needed, since the piston that pumps the oil is much smaller the piston that raises the car. However, several pump strokes are needed to fill the space in the larger cylinder as the car is lifted.
- 元直居士Lv 61 decade agoFavorite Answer
愛爾尼諾(聖嬰)是一種海水溫度及地球氣體轉換的情形.這情形會使得熱帶太平洋的氣候產生劇變. 過程是當東邊的太平洋海風吹向西邊,且把海水一起推過去. 當這風稍微緩和時,這風就會退回東邊,並把斜溫層往下推. 斜溫層就是在海面吸收太陽而高溫與地底低溫把他們隔開的一層溫度. 當表面溫度升高,氣候的狀態就會改變. 但是愛爾尼諾最後會代給我們破壞. 當這海浪突然跳高在南美洲, 亞洲就會再發生一次,但衝擊剛好相反. 因為這個原因,斜溫層反而被帶起來(不是往下推),海洋表面就會變冷. 那就會便成剌尼娜(反聖嬰), 其狀況剛好跟她的兄弟愛爾尼諾完全相反.
過去這幾年,研究人員希望關注不是只在 愛爾尼諾的過去,也要關注其未來. 如果大氣暖化是溫室效應引起, 愛爾尼諾循環的改變也可能會變化好一點. 但是怎麼做呢? 會快一點? 還是突如其來一翻兩瞪眼? 還是永遠不動了?
從過去的經驗法則沒有辦法確定是那一種. 我們也沒有完整的影像記錄我們星球的複雜性,還有不可預知的氣候變化形態, 但是因為科學家不斷地追索, 也許我們可以一窺大概的樣子.
2. 水力系統(水力學)可用在起重上面,只要用一點點的力. 原因就是100克的物體放在一平方公分的活塞可產生同樣的壓力在於一頓的物體在一平方公尺上. 汽車的起重器就是用這個原理,我們就可以用手借其力, 泵(推進器)內的油注入到一個循環機內把車頂起來. 用很小的力,從活塞頂起油要比活塞頂起車的力小很多. 如果泵大一點的話,當然要頂好幾下才能將車頂起來.
錯字: timperatental , 應是temperamental.Source(s): 24