Therefore some scientists postulate that the Earth's earliest atmosphere, unlike that of today, was dominated by hydrogen, methane, and ammonia.
因此，一些科学家推断，地球早期的大气与现在的不一样，主要由氢、甲烷和氨构成。
The Jovian planets have very thick atmospheres consisting of varying amounts of hydrogen, helium, methane, and ammonia.
木星的行星有非常厚的大气层，且由不同数量的氢、氦、甲烷和氨等元素组成。
Harris points out that around 95 per cent of the world's hydrogen is already sourced from natural gas, using fossil fuel reformers that react methane with steam to produce hydrogen and carbon dioxide.
Harris指出，世界上几乎95%的氢是由天然气生产的，其方法是使甲烷与水蒸气在化石燃料转换器中发生反应生成氢和二氧化碳。
That has big implications for extraterrestrial biology, since life is based on carbon, and methane - which is made up of carbon and hydrogen - is a byproduct of metabolism.
这对于地外生命学来说意义重大。因为生命建立在碳的基础上，而由碳和氢构成的甲烷是新陈代谢的副产品。
Natural bugs can turn out both hydrogen and methane.
天然的细菌可以生产氢气和甲烷。
So, using our simple valence bond theory, what we would expect is that we want to pair up any unpaired electrons in methane with unpaired electrons from hydrogen and form bonds.
利用简单的价电子成键理论，我们预计，要把所有甲烷中没有配对的电子，和氢原子中没有配对的电子配对来形成键。
This allows the catalyst to break down the remaining methane into solid carbon and hydrogen gas.
这使得催化剂能将余下的甲烷分解成固体碳和氢气。
So the team has developed a catalyst it says could be placed in the combustion chamber of a methane-burning power plant which would allow it to produce hydrogen with little modification.
所以这个团队开发了一种催化剂，这种催化剂可以放置在烯甲烷电站的燃烧室里，同时电站可以生产大量氢而不需要很多的改造。
Life generates methane, ammonia, oxygen, hydrogen, carbon dioxide, and many other gases.
生命生产出甲烷、氨气、氧气、氢气、二氧化碳以及其他气体。
Hydrogen sulfide leaks, methane explosions, mine-stope collapses, oh my! Coal mining is an ancient profession, and has been recognized as wildly risky since the very start.
硫化氢泄露、甲烷爆炸、煤矿坍塌，天呢，太危险了！煤矿开采是一种古老的职业，有史以来，就一直被认为是风险极高的职业。
The challenge is to take a molecule of methane, the main component of natural gas consisting of one carbon atom and four hydrogen atoms, and turn it into something bigger.
天然气的主要成分是甲烷，它含有一个碳原子和四个氢原子，这项转化的关键是把一个甲烷分子变大。
They may decompose glucose into hydrogen, carbon dioxide and methane.
它们能把葡萄糖分解成氢气、二氧化碳和甲烷。
The production of hydrogen from methane in converters will generate higher CO2 emissions per kilowatt hour since [hydrogen production] is an energy-intensive process.
因为氢生产是一种能量密集型工序，从甲烷获取氢每千瓦时将产生更多的二氧化碳。
Coke oven gas is most hydrogen and methane gas is not pure, and, therefore, generally with the centrifugal compressor.
焦炉气大部分是氢和甲烷，气体不纯净，因此，一般用离心式压缩机。
Farts are composed of: nitrogen, oxygen, carbon dioxide, hydrogen, and methane.
屁的成分：氮气、氧气、二氧化碳、氢气和甲烷。
Two molecules of methane, containing eight hydrogen atoms between them, will yield roughly one molecule of H2 – this gives an effective hydrogen yield of 25 to 30 per cent from the chemical process.
两分子甲烷含有8个氢原子，大约可生成一分子的H2，这使得该化学过程的实际氢生成量为25%至30%。
Uranian atmosphere, by composition, is 83% hydrogen, 15% helium and 2% methane although traces of other hydrocarbons have been found.
天王星大气的组成，是83%的氢，15%的氦和2%的甲烷等碳氢化合物虽然已发现的痕迹。
Methane-producing archaea (methanogens) are a type of chemolithotroph that can use carbon dioxide and hydrogen to make methane without ever seeing the sun.
产甲烷古菌（methanogens）是一种化能自养生物，它能利用二氧化碳和氢合成甲烷，而不需要太阳参与。
The atmosphere is largely composed of hydrogen and helium, plus small amounts of methane (which is responsible for the blue hue because it absorbs red light).
这里的气氛主要是由氢和氦，以及少量的甲烷(这是为蓝色色调，因为它吸收红光负责)。
It's produced for industrial purposes chiefly by a catalyzed reaction between hydrogen and carbon monoxide or carbon dioxide, or by oxidation of methane and other hydrocarbons.
它的工业生产方法主要是靠氢气与一氧化碳或二氧化碳的催化反应，或者是靠甲烷及其他烃类的氧化。
The atmosphere they create has a combination of gases such as hydrogen, water, ammonia, methane, and carbon dioxide.
他们创造的大气是由诸如氢、水、氨、甲烷和二氧化碳混合而成的气体。
The effect of hydrogen on methane combustion and ignition temperature, burning rate and burnout time are discussed through analyzing the calculated results.
通过分析计算，讨论了氢气对甲烷燃烧过程及着火温度、燃烧速率、燃尽时间的影响。
Variations of the process enable production of high purity hydrogen, methanol, ammonia, methane or low heating value gas.
此过程的演变工艺可以生产高纯度氢气、甲醇、氨、甲烷或低热值气体。
The bulk fraction is a mixture of methane, carbon dioxide, hydrogen, nitrogen and oxygen. These are measured in terms of percentage by volume.
主要成分是甲烷，二氧化碳，氢气，氮气和氧气的混合气体，这些成分的含量一般用所占填埋气的体积比来表示。
The explosive potential (energy content per unit mass) of hydrogen is about twice that of the methane in natural gas.
氢的爆炸潜能(单位质量含有的能量)大约是天然气中甲烷的两倍。
The explosive potential (energy content per unit mass) of hydrogen is about twice that of the methane in natural gas.
氢的爆炸潜能(单位质量含有的能量)大约是天然气中甲烷的两倍。
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