甲烷

The effect of liquid hydrocarbon (cyclopentane and methylcyclohexane) on methane hydrate formation conditions is studied experimentally.

实验研究了液态烃对甲烷水合物形成条件的影响，测试结果表明液态烃降低了甲烷水合物的形成压力，并改变了形成水合物的结构。

Carbon fixed by photosynthesis can be allocated below ground and supplied as decomposable carbon to the soil/sediment thro...

维管植物在甲烷排放中的作用可以部分解释自然湿地甲烷在排放的时间和空间尺度上的差异。

Molecularly imprinted polymer using quercetin as template molecules, methacrylic acid as functional monomers, ethylene glycol dimethacrylate as crosslinking agent were prepared, and the binding sites of MIP were selectively modified with diazomethane.The effects of template molecule concentration, solvent and diazomethane usage on modification were discussed.

以槲皮素为模板分子，甲基丙烯酸为功能单体，乙二醇二甲基丙烯酸酯为交联剂，制备了分子印迹聚合物，并以重氮甲烷为修饰剂，对MIP的结合点进行了选择性修饰，探讨了模板分子浓度、溶剂及重氮甲烷用量等对修饰效果的影响。

The amount of Chinese domestic dichloromethane used in the medicine industry is about 15 - 20% of the total sales quantity of dichloromethane.

中国国内二氯甲烷用于医药行业的数量约为二氯甲烷总销售量的15－20%。

Up to now, there isn't any product in China which could be used to substitute dichloromethane, and there isn't any policy change which limits the use of dichloromethane.

到目前为止，中国国内没有二氯甲烷的替代产品，也没有限制二氯甲烷使用的政策变化

This paper reports results of Tin doped fibre pumped by a semiconductor laser diode as an optical source for methane gas detection. The spectral characteristics of the Tm doped fibre pumped by the 788 nm laser diode is studied experimently and the fibre source is used in a correlation spectroscopy measurement system.

报道了以半导体激光器泵浦掺Tm3+光纤为光源的甲烷气体相关光谱检测系统，研究了788 nm波长泵浦下掺Tm光纤光源的一些光谱特性，并在实验上用这种光源及系统对甲烷气体作了测量。

The results showed that the maximum UV absorption wavelengths of those 1,3,4-oxadiazole derivatives in dichloromethane were in the range of 268~327 nm, and their maximum photoluminescent wavelengths in dichloromethane and solid film were located at 332~390 nm and 359~439 nm, respectively. The 1,3,4-oxadiao1e derivatives exhibit a first endothermal peak at 120~328℃ in the DSC heating process, and the symmetrical 1,3,4-oxadiazole derivatives display a higher melting temperature. The CV curves of those 1,3,4-oxadiazole derivatives indicate that the reductive potentials of the 1,3,4-oxadiazole derivatives are located at -1.03~0.98 V, and their LUMO(the lowest unoccoupied molecual orbit) energy levels are -3.71~-3.76eV.

结果表明，该类衍生物在二氯甲烷溶液中的最大紫外吸收波长在268~327nm范围，在二氯甲烷溶液和固体膜中的最大荧光发射波长分别在332~390nm和359~439nm范围；DSC分析结果表明，5个噁二唑衍生物的起始吸热峰位于120~328℃之间，其中对称结构的噁二唑衍生物显示了较高的熔融温度；由循环伏安图和相关计算结果表明，5个噁二唑衍生物的还原电位位于-1.03~-0.98V，其相应的最低非占有分子轨道能级在-3.71~-3.76 eV之间。

The application of flamelet model based on level set in premixed turbulence combustion;2. A methane turbulent non-premixed flame has been simulated numerically by the combination of laminar flamelet model and presumed probability density function.

将小火焰模型和假定的PDF方法相结合，模拟甲烷湍流射流扩散火焰，稳态火焰面结构由层流小火焰数据库得到，采用详细化学反应机理描述甲烷的氧化和NO以及碳烟的生成，数值模拟结果和实验数据吻合较好，说明小火焰模型可以较准确地计算出扩散湍流火焰中的燃烧过程。

Research on methyl bromide alternatives is one of the hot issues in the area of current pest control. To study and develop new alternative fumigant, re-evaluate current fumigants are the focus of methyl bromide alternatives research.

溴甲烷替代研究是当前有害生物控制领域的热点问题之一，研究开发新的替代熏蒸剂，重新评估已有熏蒸剂，是溴甲烷替代研究工作的重点。

"We observed and mapped multiple plumes of methane on Mars, one of which released about 19,000 metric tons of methane," says Geronimo Villanueva of the Catholic University of America in Washington, DC Villanueva is stationed at NASA Goddard and is co-author of the paper.

"我们观察和对应多个柱在火星上的甲烷，其中一个释放大约1.9万吨的甲烷，"维拉纽瓦说，赫罗尼莫的天主教大学，在华盛顿特区维拉纽瓦是驻扎在美国宇航局戈达德是的作者之一文件。

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。