甲烷

The Danish Tax Commission estimates that a cow will emit four tonnes of methane a year in burps and flatulence, compared with 2.7 tonnes of carbon dioxide for an average car.

丹麦税务委员会估算，一头奶牛因为打嗝和胃部胀气，每年释放4吨的甲烷，而每辆车每年平均排放的二氧化碳只有2.7吨。

Frank Mitloehner, a University of California, Davis, professor who places cows in air-tight tent enclosures and measures what he calls their "eruptions," says the average cow expels — through burps mostly, but some flatulence — 90 to 180 kilograms of methane a year.

戴维斯加州大学教授法兰克。密特罗艾纳把乳牛放在密闭的帐篷内，测量他称之为乳牛的「喷出物」，他说，乳牛平均每年排放90到180公斤甲烷，大部分经由打嗝，一部分是肠胃胀气。

Methods: The pesticides were extracted with acetone and dichloromethane. The extract was warmed with water at 80℃, circumrotated and evaporated until it was nearly dry. Then it was cleaned-up by Envi-Carb column and Sep-Pak-NH2 column.

本法采用丙酮、二氯甲烷提取，40℃水浴旋转蒸发近干，以Envi-Carb柱和Sep-Pak-NH2柱净化，以气相色谱－质谱选择离子监测方式分析检测有机磷、有机氯、氨基甲酸酯和除草剂等32种农药残留。

Compounds such as methane can be cleaved to carbon and hydrogen.

象甲烷这样的化合物能分解为碳和氢。

The present dissertation deals with:(1) Exploring the feasibility of the CO〓 methanation and the conversion CH〓/H〓 into C〓 hydrocarbons under plasma with catalyst at ambient temperature and atmosphere.(2) Designing a reactor and preparing some catalysts suited for the conversion of carbon dioxide via the cooperation effect of plasma and catalysts.(3) Optimizing reaction conditions of conversion carbon dioxide to C〓 hydrocarbons in the proposed process.(4) Studying the reaction mechanism of conversion carbon dioxide to C〓 hydrocarbons under plasma by using in situ OES technology.(5) By the results of characterizing coked catalysts, exploring the reasons that result in the coking of catalyst and the paths for decreasing the deposit in the catalyst under plasma.(6) Analyzing the energy efficiency of the plasma catalysis and exploring the paths for improving the energy efficiency.

论文的主要研究工作包括：（1）探索脉冲电晕等离子体与催化剂共同作用CO〓／H〓甲烷化和由CH〓/H〓合成C〓烃反应的可行性；（2）研制等离子体催化CO〓转化的反应器和适配的催化剂；（3）优化等离子体催化CO〓转化制C〓烃反应的工艺条件和电参数；（4）利用原子发射光谱原位技术对等离子体反应的诊断结果，对等离子体催化CO〓转化制C〓烃反应的机理进行推断；（5）通过对积碳催化剂的表征结果，分析积碳的类型及其成因，并探讨减少积碳的途径；（6）通过对等离子体催化CO〓转化制C〓烃反应能量效率的分析，探讨提高等离子体催化反应能量效率的途径。

The denitrification and methanogenesis are simultaneously conduced in the UASB reactor, and almost 100% denitrification has been achieved.

在单一UASB反应器内，发生了缺氧反硝化和厌氧产甲烷的双重生化反应，UASB反应器内获得了几乎100%的反硝化率。

In Hong Kong, 30% of the waste comes from food disposed, who decays to release the greenhouse gas

在香港，30%的垃圾来自丢弃的食物。食物降解变成温室气体甲烷。

Defatting with different solvents had no effect on the activity of ricin, but the average lethality of the ricin obtained from defatting with methylene chloride was relatively slowly.

采用不同溶刺脱脂对蓖麻毒蛋白的活性没有影响，但二氯甲烷脱脂的蓖麻粗毒蛋白平均致死速度相对较慢。

The dew point of the dehumidified gas was -8～ 13 ℃ under a gas transportation pressure of 4.6 MPa. A recovery of more than 98%of methane was achieved.

稳定运行结果为：净化气露点-8～-13℃(输气压力4.6 MPa)，达到气体传输要求；甲烷回收率≥98％。

Methane is used as the selective dehydrating agent for the production of 2,3,3,3-tetrafluoro-l-propene (R1234yf) from 2,2,3,3,3-pentafluoro-l-propanol.

使用甲烷作为选择性脱水剂由2，2，3，3，3-五氟-1-丙醇制备2，3，3，3-四氟-1-丙烯(R1234yf)。

This one mode pays close attention to network credence foundation of the businessman very much.

这一模式非常关注商人的网络信用基础。

Cell morphology of bacterial ghost of Pasteurella multocida was observed by scanning electron microscopy and inactivation ratio was estimated by CFU analysi.

扫描电镜观察多杀性巴氏杆菌细菌幽灵和菌落形成单位评价遗传灭活率。