查询词典 hydrogen

The different substitutes had an effect on the main form of β-diketones, making the hydrogen donors to chloranil different correspondingly.

二酮类化合物中的不同取代基会影响其主要存在形式，因而使得四氯苯醌夺取氢的对象也有所不同。

In the process, chloranil firstly was excited to singlet state and then a labile hydrogen abstraction interaction between singlet chloranil andβ-diketones was involved to form singlet stable neutral radical pairs.

光照作用下，四氯苯醌首先跃迁至单线态，然后夺取β二酮类化合物分子中的活泼氢，形成单线态中性自由基对。

The result indicated that, Next time the sodium chlorate oxidant processing effect will have to throw in the same condition adds the hydrogen peroxide solution the processing effect to have to be better than.

结果表明：在相同的条件下次氯酸钠氧化剂的处理效果要比投加双氧水的处理效果要好。

It is based on the greatly enhancive effect of chlordiazepoxide on the chemiluminescence reaction between luminol and hydrogen peroxide in the flow system.

研究了氯氮卓在luminol-H2O2-NaOH体系中的化学发光行为，在选定的最佳实验条件下，测定了氯氮卓浓度与化学发光强度的关系。

Two main raw materials: First, hydrogen chloride, and the other is industrial silicon.

两个主要的：一是原材料，氯化氢，另一种是工业硅。

First, a chlorinator was self-designed in this paper, and dichloride of 2-methyl-1-propene was synthesized by 2-methyl-1-propene reacted with chlorine fast in this reactor. By means of the Orthogonal Experiments design and single factor experiments, the influence of several reaction variables on the yield were examined and the optimum reaction conditions under the intervallic operation were obtained, the yield and selectivity of dichloride of 2-methyl-1-prop-ene were more than 65% and 80% respectively. Second, the preparation of 2-methylene-1, 3-propanediol, which dichloride of 2-methyl-1-propene reacted with alkali was investigated. By means of the Orthogonal Experiments design and single factor experiments, the influence of several reaction variables on the yield were examined and the optimum reaction conditions under the intervallic operation were obtained, the conversion of dichloride of 2-methyl-1-propene was 100%. Moreover the preparation of MPO, which 2-methylene-1, 3-propanediol reacted with hydrogen, in presence of Al_2O_3-Pd catalyst, was gotten, and the product was appraised.

本文在氯化反应过程中，自行设计制作出了氯化管式反应器，在该反应器中异丁烯和氯气迅速混合反应生成二氯异丁烯，根据该氯化反应特征利用正交试验和单因素试验考察了有关因素的影响并优化得到了最佳工艺条件，二氯异丁烯的总收率达65％以上，选择性达80％；接着，对二氯异丁烯进行水解反应制得了2-甲烯-1，3-丙二醇，讨论了相关因素对水解反应的影响，并通过正交试验和单因素试验得到了较佳工艺条件，二氯异丁烯的转化率达100％；同时还对制备的2-甲烯-1，3-丙二醇在常压下采用三氧化二铝负载钯催化剂催化加氢得目的产物MPO，并对产品进行了鉴定，从而打通了整个工艺路线。

The effect of chlorine dioxide and hydrogen peroxide on the shelf life of wet raw noodle was investigated.

主要研究了二氧化氯和双氧水在湿生面条保鲜方面的作用。

Chlorofluorocarbon: Any of several organic compounds containing carbon, fluorine, chlorine, and hydrogen.

氯氟烃：由碳、氟、氯和氢组成的若干有机化合物中的任何一种。

A changing carpet of hot gas is visible in the chromosphere of the Sun in the above image taken in a very specific color of light emitted by hydrogen.

可以在上面这张影像中看到，在太阳色球层内有不断变化的炽热气体，影像利用氢气发出的极特殊光线拍摄而得。

Though the reddish hydrogen radiation is most visible to the unaided eye, the chromosphere also radiates thousands of additional spectral lines.

虽然微红色的氢射线可被肉眼直接观测到，色球层也可辐射数千额外的谱线。

You can snipe the second and third union leaders from this position.

您可以鹬第二和第三工会领袖从这一立场出发。

Aiming at the currently shortage of XML streams quality detecting, this paper proposes a new forecasting method of XML streams quality by least squares support vector machines, which is used the method of XML keys' vector matrix as windows, and vector product wavelet transform to multilevel decompose and refactor the XML streams series, that can fulfill real-time checking demand of XML quality, and ensure constraint, consist- ency and integrality. For even more adapting net load, it proposes a control strategy by weight and adaptive adjustment to ensure XML streams quality.

针对当前XML数据流质量检测存在的不足，提出构建XML键的矢量矩阵作为窗口，利用矢量积小波变换多级分解与重构XML数据流，再结合最小二乘支持向量机对XML数据流质量进行预测的一种方法，满足XML数据流质量重构时实时检测的要求，保证XML数据的约束性、一致性与完整性；为了更好的适应网络负载，采取加权与自适应窗口调整等调度策略充分保证XML数据流的质量检测。