[网络] 准中子

by Jason Marshall Weve now talked about three methods for calculating average values: the mean, median, and mode (affectionately known as the three Ms). So, are we done? Is that everything we could ever want to know about interpreting average values?

发表于:2018-12-07 / 阅读(197) / 评论(0) 分类 数学英语

Plasmas I always like to think of as being like naughty children. 我一直觉得电浆就像调皮的小孩 They're full of energy and they are, 充满了能量,随时随地都想捣蛋 want to misbehave and it's ourjob to try 我们的工作就是

发表于:2018-12-07 / 阅读(225) / 评论(0) 分类 太阳科普

So if you popped open the blueberry and were searching for the nucleus 如果你在蓝莓的内部搜索原子核,结果是一无所获。 You know what? It would be invisible. It's too small to see! 知道为什么吗?因为我们看不到它!它

发表于:2018-12-08 / 阅读(157) / 评论(0) 分类 TED演讲教育篇

You probably already know everything is made up of little tiny things called atoms 你也许已经知道所有的东西都是由微小的原子组成。 You might even know that each atom is made up of even smaller particles called protons, neutrons

发表于:2018-12-08 / 阅读(151) / 评论(0) 分类 TED演讲教育篇

Science and Technolgy. 科技。 Modern alchemy. 现代炼金术。 Turning a line. 进入新的一行。 The race to extend the periodic table continues. 扩展元素周期表的比赛仍在继续。 ONE of the first inklings that chemistry has an u

发表于:2018-12-31 / 阅读(264) / 评论(0) 分类 经济学人科技系列

This is Scientific American's 60-second Science, I'm Steve Mirsky. Got a minute? Back on January 15th, US Airways Flight 1549 made that amazing water landing in the Hudson after both engines were taken out by Canada geese, which can weigh eight pound

发表于:2019-01-08 / 阅读(173) / 评论(0) 分类 Scientific American(六)月

Some people of Italian ancestry, like me, might have a surprise in the family treea man of east Asian descent, who was living and working 2,000 years ago in the boondocks near the heel of the Italian boot. The discovery is the first good evidence of

发表于:2019-01-08 / 阅读(181) / 评论(0) 分类 Scientific American(二)月

This is Scientific American's 60-Second Science. I'm Steve Mirsky. Got a minute? The 2011 Nobel Prize in chemistry goes to Daniel Schechtman of the TechnionIsrael Institute of Technology in Haifa. Schechtman discovered what are called quasicrystals.

发表于:2019-01-08 / 阅读(285) / 评论(0) 分类 Scientific American(十)月

Two hearts beating together 两颗心跃动相同的频率 Two bodies just one soul in search of each other 栖息在两个躯体的同一灵魂寻求彼岸的共鸣 They said it couldnt happen 人们都说这不可能成真 But we broke all the odds

发表于:2019-01-10 / 阅读(167) / 评论(0) 分类 听歌学英语

以下段落是摘自新闻里的一些重要信息,并不是一个段落的听写。空内信息可在本新闻中全部找到,大家可以根据这些信息复述新闻。 一、泛听建议: 1、完整听一遍,掌握大意。 2、继续听,特

发表于:2019-01-22 / 阅读(147) / 评论(0) 分类 NPR边听边练

我数三下 一 I'm going to count to three. One... 哦 好吧 Oh,all right. 你的手段真是太高明了 That was amazing how you handled him. 我知道怎么对付不听话的小孩 I know how to deal with stubborn children. 我妈以前在我家地

发表于:2019-01-28 / 阅读(141) / 评论(0) 分类 生活大爆炸第三季

The structure of atoms and the significance of protons will come in a following chapter, so for the moment all that is necessary is to appreciate the organizing principle: hydrogen has just one proton, and so it has an atomic number of one and comes

发表于:2019-01-29 / 阅读(166) / 评论(0) 分类 万物简史

The eventual result was the inflation theory, which holds that a fraction of a moment after the dawn of creation, the universe underwent a sudden dramatic expansion. It inflatedin effect ran away with itself, doubling in size every 10-34seconds. The

发表于:2019-01-29 / 阅读(150) / 评论(0) 分类 万物简史

Questions 12-20 The elements other than hydrogen and helium exist In such small quantities that it is accurate to say that the universe somewhat more than 25 percent helium by weight and somewhat less than 25 percent hydrogen. Astronomers have measur

发表于:2019-02-05 / 阅读(203) / 评论(0) 分类 托福英语

Although quarks are much too small to have color or taste or any other physical characteristics we would recognize, they became clumped into six categoriesup, down, strange, charm, top, and bottomwhich physicists oddly refer to as their flavors, and

发表于:2019-02-17 / 阅读(130) / 评论(0) 分类 万物简史

The charged pion and antipion decay respectively into a muon plus antineutrino and an antimuon plus neutrino with an average lifetime of 2.603 x 10-8 seconds, the neutral pion decays into two photons with an average lifetime of about 0.8 x 10-16 seco

发表于:2019-02-17 / 阅读(167) / 评论(0) 分类 万物简史

Meanwhile the tireless Rutherford, now back at Cambridge as J. J. Thomson's successor as head of the Cavendish Laboratory, came up with a model that explained why the nuclei didn't blow up. He saw that they must be offset by some type of neutralizing

发表于:2019-02-17 / 阅读(176) / 评论(0) 分类 万物简史

Neutrons and protons occupy the atom's nucleus. The nucleus of an atom is tinyonly one millionth of a billionth of the full volume of the atombut fantastically dense, since it contains virtually all the atom's mass. As Cropper has put it, if an atom

发表于:2019-02-17 / 阅读(133) / 评论(0) 分类 万物简史

This involved bombarding samples with neutrons in a small nuclear reactor and carefully counting the gamma rays that were emitted; 这项技术包括在一个小型核反应堆里用中子轰击样品,仔细计算释放出来的射线。 it was ext

发表于:2019-02-25 / 阅读(236) / 评论(0) 分类 万物简史

Let us pause for a moment and consider the structure of the atom as we know it now. Every atom is made from three kinds of elementary particles: protons, which have a positive electrical charge; electrons, which have a negative electrical charge; and

发表于:2019-02-25 / 阅读(236) / 评论(0) 分类 万物简史
学英语单词
active environment group
alto cumulus stratiformis
aster subulatus sandwicensis
Asturies
backbond
Beck's triad
benzosulfate
Bretton Woods Agreement Act
carbon tool steel drill
casino capitalism
centrifuge (centrifuger)
column tube material
compressor set
computer variable
Crayford focuser
credit card insurance
decision tree analysis
declared attribute
Dien Phu
digital coast line generator
direct copper dyes
direct product of finite family of sets
engine control
evil spirits
exogenic geological process
fagiolo
fleet satellite communication system (fleetsatcom)
front bumper arm
front end concentrator
gravitational contraction
guardianless
having had it
henneseys
image analyzing computer
innard
inside door
intercontinental transit circuit
intergemmal
Itabru Falls
jauked
joyous
Jpn.,Jpn
Kotovsk
kuniuling series
Langau
Lee & H.
level of communication priority
line code principle
mahubarana fat
man-machine dialogue equipment
mechano-receptor
melanotic hyperpigmentation
methyl propyl ether
micromv
mittlingen
mobile store
nervulose
nickel-and-dimes
nocardia
number of crimp
package goods
pairwise independent events
parroche
pawn chain
percentage of total elongation
porciculture
possum
predestinarians
presle
price that we cannot repeat
proto(a)etioporphyrin
proviodine
Radar.
regional diagnosis
registered seed
reliable text
renal salt-wasting syndrome
repromicin
resistance-type level transducer
salafi movements
scratchpad RAM
self-assumption
set about sth
shatter-resistant
socko
soft-decision decoding
source angency
spiral flow tank
split-plot confounding
stearic amide
subtractiveness
taking over
tar bender
thermionic tube voltmeter
thin route circuit
tool tip
trabelsi
two-parters
umbilicus (or navel)
wake up
wiggle tail cultivator
World Muslim Congress