SSS 2008-05-12
时间：2019-01-08 作者：英语课 分类：Scientific American(五)月
This is Scientific American's 60-Second Science. I'm Cynthia Graber. This'll just take a minute.
Olive oil producers generally guess the best time to harvest their olives by
checking the fruit’s color. The olive has to hit that perfect spot where they’ve just turned ripe—purple to black—but aren’t yet falling to the ground. Now, scientists at Israel’s Ben-Gurion University are helping 1 them out with nuclear magnetic resonance 2, also known as NMR. NMR is usually used medically to create images or measure a specimen’s levels of proteins and fat. But this is the first time it’s being used industrially. Researchers first take digital photos of olives at different levels of ripeness. Then they put the olives in the NMR machine. Within a few seconds it determines the olives’ oil content. Combing the photos with the oil information allows scientists to create a database correlating peak oil with perfect color. A farmer in the field could take pictures of his crop. A special camera would average the olives’ color and tell him the optimal 3 time to harvest. In a test, a local farmer learned that if he had harvested his crop 10 days earlier, he could have gotten 25 percent more olive oil.
Thanks for the minute. For Scientific American's 60-Second Science, I'm Cynthia Graber.
- The poor children regularly pony up for a second helping of my hamburger. 那些可怜的孩子们总是要求我把我的汉堡包再给他们一份。
- By doing this, they may at times be helping to restore competition. 这样一来, 他在某些时候,有助于竞争的加强。
- Playing the piano sets up resonance in those glass ornaments.一弹钢琴那些玻璃饰物就会产生共振。
- The areas under the two resonance envelopes are unequal.两个共振峰下面的面积是不相等的。