查询词典 chemical method

The aqueous method desulphurization may induce divides into the physical absorption law, the chemical absorption law and the oxo-process three kinds.

湿法脱硫可以归纳分为物理吸收法、化学吸收法和氧化法三种。

The invention relates to a synthesis method of the chemical luminous material acridine ester DMAE question mark NHS.

本发明涉及一种化学发光物质吖啶酯DMAENHS的合成方法。

Based on systematically analyzing physical and chemical indices of lime furnace ash,study the technical method of extracting potassium chlo-ride from lime furnace ash by immersion method .

在系统分析石灰炉炉灰物化指标的基础上，研究了采用石灰炉炉灰，利用水浸法提取氯化钾的工艺方法。

The fungal DNA was extracted from three natural soils with greater differences in physical anti chemical properties in North China by using the second method, and the 28S rDNA-PCR-DGGE profiles showed that the fungal DNA banes were comparatively rich, suggesting that this method could be used in fungal diversity research of North China soils.

利用后一种方法分别对3种理化性质差异较大的中国北方自然土壤样品真菌DNA进行提取并分析，表明所提取土壤基因组DNA真菌特异性PCR-DGGE图谱条带丰富，该方法可用于多种北方土壤真菌多样性研究。

The standard materials of geology,chemical prospecting,heap leaching,gold ornaments and lossfree detecting series of gold and the standard analytical method as well as professional standard method of analysis promulgated all by the state ity are introduced emphatically.

具有&化学成分计量物&之称的黄金标准物质，在分析测定中起到传递准确值的作用，使不同地点、不同方法技术、不同时间测得的量值具有对比性。黄金标准分析方法体现了现代黄金分析方法的特点和水平，体现了现代

The extraction amount with soxhlet extraction method was less in each extraction, and this method could be only used in experimental study. The extraction solvent of chemical extraction had pois on which could cause some pollution and toxicity.

索氏提取法每次提取的量较少，只能用于试验研究；化学萃取法的提取溶剂有毒，会造成一定的污染和毒害。

The most common manipulation technique is the lateral manipulation method that utilizes a tunable chemical bond interaction between the probe tip and adatom to "slide" the adatom to different lattice sites on the surface.3,4 This method has been successfully used to create numerous quantum confined nanostructures.5-7 In adatomsubstrate systems where lateral manipulation does not work well, vertical manipulation techniques have been developed.

最常用的手段横向操纵技术方法，采用了可调式化学键探针针尖和互动 adatom&滑&adatom网站在不同网格 4这方法surface.3已成功地用于创建在adatomsubstrate nanostructures.5-7众多量子局限横向操纵系统不能正常工作了哦，垂直操作技术。

Here, Risk Assessment Code matrix method and runaway scenario analysis method were used to evaluate the thermal runaway criticality, and some reaction conditions were compared and analyzed as well. At last, based on the experimental results, the theoretical calculation was adopted to analyze the decomposition of nitration product and the electrophilic substitution mechanism of these nitration reactions. All these work are of important value for the correct evaluation of thermal risk and the decrease of chemical reaction runaway accidents.

本文采用风险矩阵法和失控情景分析方法评估此反应的热失控危险，对反应中的一些影响因素展开比较和分析，并结合实验结果，从理论角度进一步分析了各硝化产物分解的难易性和硝化反应亲电取代的硝化机理，这些工作对准确评估反应的热危险，减少反应失控事故具有重要的参考价值。

In this work, the ionic liquids was used as the microwave absorption medium and an ionic liquid-non polar solvent microwave extraction method was developed. The proposed method was applied to the extraction of the chemical constituents from the root of Panax ginseng C.M.

以离子液体作为微波吸收介质建立了离子液体-非极性溶剂微波提取法，对人参中的化学成分进行了提取，并将该法与固体微波吸收介质-非极性溶剂微波提取法、极性溶剂微波提取法以及混合溶剂微波提取法进行了对比。

The main research work of this dissertation is as follows: Based on the chemical reaction engineering theory and the nitrobenzene electroreduction mechanism, the plate and frame electrolyzer was designed and applied to the process of electroreduction nitrobenzene to p-aminophenol. This dissertation measured the residence time distribution data of the electrolyzer by means of the pulse response method and studied the rule of flow pattern along with the current capacity change. Under different conditions ,this dissertation studied the cyclic voltammetry properties of nitrobenzene on different electrodes by means of the dynamic cyclic voltammetry method and the electrode materials applied to the NB electroreduction have been selected primarily.Baseed on the results of cyclic voltammetry tests, this dissertation used p-electrode systems to measure the steady-state- polarization curves of nitrobenzene on different electrodes in H-type diaphragm cell, and obtained each primary factor s influence rule and the exchange current density value of each electrode.And then on the basis of the conclusions of fundamental researchs upword, the effects of influence factors on the the yield of p-aminophenol and the current efficiency,such as electrode material, current density, quantity of electricity circulated, nitrobenzene concentration . sulpuric acid concentration and so on, have been studied in detail in the systems of hign temperature , strong acidity and oxygen-poorthrough a series of electrolysis experiments in this paper.After all using Pb as anode Monel metal as cathode Dupont Nafion 417 cation-exchange membrane as membrane, this dissertation obtained the optimum technological condition: reaction temperature about 85C, current density 500A m-2, sulphuric acid concentration 20%wt.

论文的主要研究工作为：运用化学反应工程理论，结合硝基苯的电还原机理，设计出用于硝基苯直接电还原合成对氨基苯酚实验的板框式电解槽，并利用脉冲响应法测定了该板框式电解槽的停留时间分布数据，研究了流型随流量变化的规律；通过动态循环伏安法研究了硝基苯在不同电极上、不同条件下的循环伏安特性，初步评选出了用于硝基苯电还原的电极材料；结合循环伏安的测定结果，在H型隔膜电解槽中采用三电极体系测定了硝基苯在不同电极上、不同条件下的稳态极化曲线，得到了各主要因素的影响规律及硝基苯在各个电极上电还原的交换电流密度数值；在基础研究结论指导下，采用板框式电解槽，在高温、强酸、贫氧系统中，进行了一系列的电解实验，分别考察了电极材料、电流密度、通电量、硝基苯浓度、硫酸浓度等因素对收率及电流效率的影响，最终选择以蒙乃尔合金电极作为阴极、铅合金为阳极、Dupont Nofion 417阳离子交换膜为隔膜，得到由硝基苯直接电还原制对氨基苯酚的最佳电解工艺条件：反应温度85℃，电流密度500A·m~(-2)，硫酸浓度20％wt。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。