甲烷

The structures were identified by IR, UV,〓 NMR and element analyses. 2. Free radical 4-hydroxy-2,2,6,6-tetramethyl-1-piperidinyloxyl as catalyst, the phase transfer catalyzed method of oxidation eighteen semicarbazides to N-Aryl-2-Phenyl diazenecarboxamide with a solution of potassium ferricyanide in 2N aqueous sodium hydroxide and dichloromethane is described for the first time.

利用2，2，6，6-四甲基-4-羟基-1-哌啶氮氧自由基为相转移催化剂，在饱和铁氰化钾的2N氢氧化钠溶液与二氯甲烷的两相反应液中，催化氧化十八个取代氨基脲得到十八个相应的新型偶氮化合物N，2-二芳基二氮亚烯甲酰胺，均获得了较高的产率。

In 1L semi-continuous tank reactor,researches the effects of sodium dodecylsulfate,potassium oxalate,mixture of sodium dodecylsulfate and potassium oxalate on formation process of methane hydrate .

在1L的半连续搅拌槽式反应器中，研究了添加剂十二烷基硫酸钠、草酸钾和草酸钾与十二烷基硫酸钠复合对甲烷水合物生成过程的影响。

The phosphines such as 〓, dppm bis(diphenylphosphinemethane, dppebis(diphenylphineethane and dppp bis(diphenylphosphinrpropaneare chosen for study. The chloro alkane, bromide alkane and acetone arechosen as solvents.

选择有机单膦〓和双膦配体dppm二(二苯基膦甲烷、dppe二(二苯基膦乙烷、dppp二(二苯基膦乙烷与〓反应，选择氯代烷、溴代烷和丙酮为反应溶剂。

This stoichiometric mixture represents the precise amount of air needed to completely burn one mole of methane. If more air is supplied than required for stoichiometric combustion, the mixture is termed lean and oxidising.

这个最佳混合比率表征了1摩尔甲烷充分完全燃烧需要的空气量，如果进入的空气量超过所需空气，称为稀薄燃烧。

The recent progresses in these fields were summarized in this paper. It focuses on the activation and oxidation on a series of hydrocarbons (from CH4 to these hydrocarbons with six carbons). The catalysts and oxidants reported here include organic metal compounds and inorganic compounds (such as molecular sieves, metal clusters, metal oxidates and so on).

本文总结了近几年在碳氢化合物的活化及氧化领域的一些新进展，涉及的底物包括从甲烷到碳原子数等于6的烃类，而催化剂及氧化剂包括有机金属化合物和无机化合物（如分子筛催化剂、金属团簇和金属氧化物等）。

The reaction temperature is crucial for formation of nanotube, and the suitable temperature range is 500～850℃.

以甲烷为碳源、氧化镁为催化剂载体，制备了高纯度，大直径的单壁碳纳米管。

CeO2 doped ZnO nanowires were synthesized by thermal evaporation, then prepared as the heater type gas sensors. Under violet ray radiation (wave length: 370~395 nm), the gas sensitivity of CeO2 doped ZnO nanowires has been measured using static state distribution.

以物理热蒸发法制备的CeO2掺杂ZnO纳米线为气敏基料，制作成旁热式气敏元件，采用紫光（波长（为3702~395nm）激发，用静态配气法对浓度均为1×10^(-2)%的甲烷和一氧化碳进行了气敏性能的测试。

In the process, we are once again adding to the threat of global warming, be-cause methane has been one of the fastest-growing green-house gases, and is third only to carbon dioxide and water vapor in total volume, changing the chemistry of the upper atmosphere.

我们的这种行为更进一步地增加了地球变暖的危险，因为甲烷是一种形成速度极快韵温室效应气体，它在大气中的总含量仅次于二氧化碳和水蒸气，使高空大气层的化学成分都发生了变化。

Experimental data of critical parameters, and the correlations of saturated liquid and vapor density, enthalpy of vaporization, vapor pressure, pVT properties, second virial coefficient, ideal-gas heat capacity, surface tension, viscosity and thermal conductivity are obtained in this paper.

介绍了三氟碘甲烷(CF3I)热物理性质的研究成果，包括临界参数的实验数据以及饱和气液密度、饱和蒸气压、汽化潜热、 pVT性质、第二virial系数、理想气体比热容、表面张力、粘度、导热系数等的关联式，并与文献数据进行了比较，分析了实验数据对关联式的偏差。

Methane is a characteristic gas dissolved in transformer oil, which can be used in the early transformer fault diagnosis.

甲烷(CH4)是变压器油中溶解的一种可用于变压器早期故障诊断的特征气体。

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。