查询词典 synthesis method

objective to determine the contents of residual acetone in acetoacetic ester,the raw material for the synthesis of edaravone, by gas chromatography.methods sample solution was injected on a gdx column (0.18 mm～0.25 mm) with nitrogen as the carrier gas.the residue was calculated by the external standard method.results the linearity was good over the range of 25 μg/ml～400 μg/ml,with the correlation coefficient of acetone being 0.996 and the average recovery 96.8%.conclusions the method was proved to be simple,rapid,practical and highly sensitive.it is an efficient method for the quality control of acetoacetic ester.

摘要］ 目的：用气相色谱法测定依达拉奉合成起始原料乙酰乙酸乙酯中丙酮的残留量。方法：采用固定相为二乙烯苯乙基乙烯苯型高分子多孔小球（直径为0.18 mm～0.25 mm），氮气为载气，用外标法测定乙酰乙酸乙酯中残留丙酮的含量。结果：该方法在丙酮浓度范围在25 μg/ml～400 μg/ml内呈良好的线性关系，响应曲线相关系数为0.996，平均回收率为96.8%。结论：本法简便，快速、实用，灵敏度高，可有效地用于乙酰乙酸乙酯的质量控制。

This paper puts forward, in the point, gravimetric geoid method, geometric geoid method and synthesis method to transform ellipsoid height into orthometric height.

基于此，扼要提出应用重力大地水准面法、几何大地水准面法和综合法将GPS椭球高改化为正高的方法。

In this paper,the method for synthesis of 5 new phosphonic acid products,from the reactions of 2-amine thiadiazole and different aldehydes with phosphorous acid by the melting method or the solvent method,was introduced.

用2-氨基噻二唑、醛与亚磷酸反应，应用融熔法与溶剂法合成了一系列新的噻二唑膦酸，并用IR、1HNMR、31PNMR等方法对化合物进行了表征。

Calcium montmorillonite was prepared by purifying LeXi bentonite with wet method two times. After purification, sodium modification of Ca-M was studied. A series of Fe/Cr-pillared montmorillonites were prepared with conventional method using sodium montmorillonite as experimental materials, and synthesis condition of Fe/Cr-PILM was studied and optimized. In order to shorten the preparation cycle of PILM by overleaping the step of sodium modification of Ca-M, the pretreatment technique for Ca-M has been pointed out for the first time. A series of PILMs were prepared with hydrothermal method using pretreated Ca-M as starting materials, which show that pretreatment of Ca-M is feasible.

然后，本文以莱西膨润土为原料，用二次湿法提纯了-2μm的钙基蒙脱石，对其进行了钠化改型研究；以改型后的钠基蒙脱石为原料，新型的铁、铬复合离子为柱化剂，研究并优化了常规离子交换法制备PILM的工艺；为了简化PILM的制备工艺，我们首次提出了蒙脱石的预处理工艺，希望通过预处理后可以省去蒙脱石的钠化工艺，以Ca-M为原料直接合成PILM。

On the basis of these method. Coupled with three kinds of problem in linkage mechanism synthesis design such as guidance of rigid body, function and track achievement. The course mainly presents basic theory, analysis method and example as well as nonlinear equation method of settlement in linkage mechanism

结合连杆机构的综合设计：刚体导向、实现函数、实现轨迹三类问题，重点介绍了进行连杆机构综合设计的基础理论、分析方法、分析实例，以及在连杆机构的综合设计中非线性方程的求解方法。

During the investigations, some basic research methods and theories such as mending the end section profile of the screw arbor gear applying the conjugate principle, the milling outline for the screw arbor profile cutter by kineto-synthesis method, establishing the dummy variable model of the screw arbor by the CAD method, the theory of the distributing of the fluid pressure on the screw, the precision analyzing and computing screw profile by the dummy model and FEM method are established.

在研究过程中确立了一些基本的研究方法和基本的理论。如应用共轭原理改进螺杆端截面齿曲线的、利用运动合成的方法研究螺杆成形铣刀廓型、应用计算机辅助设计的方法建立螺杆的虚拟模型、应用牛顿流体理论研究螺杆中的流体压力分布、应用有限元分析计算方法对螺杆做精确分析计算。

The method avoids loose and porous hydrotalcite thin film by traditional chemical conversion method and powder coating method, and has such advantages as simple process and mild synthesis conditions. The obtained hydrotalcite thin film has excellent anticorrosive performance, and can improve the anticorrosive performance of Mg alloy.

本发明避免了传统的化学转化法和粉体涂覆法得到的水滑石薄膜结构疏松多孔的问题，且工艺简便，合成条件温和，比传统的水滑石膜层更具有优良的抗蚀性能，可以提高镁合金的耐腐蚀性能。

Using this method makes the designed piping have the characteristics of the synthetic minimum of energy loss construction and mainteuance costs, and excellent technical quality. It shows that the application of the method to a steam piping design can achieve saving of operating cost by about 20 percent against the design made by non-thermoeconomic synthesis method.

采用该方法进行设计，可使热网的初投资、能耗及运行维护等费用综合最小，而且具有优良的技术性能，它与不采用热经济最优综合方法的设计相比，可做到平均节省运行成本20%以上。

In the first part, chemical synthesis, including by acraldehyde, malonic ester, ami no lactone and others were discussed and synthesis by hydantoin was emphasized.

第一部分讨论了DL-蛋氨酸及其衍生物的化学合成，包括丙烯醛法、丙二酸酯法，氨基内酯法等，并着重介绍了海因法。

Objective To investigate the synthesis methods Veratrum aldehyde and to study the synthesis of microwave radiation of the advantages and disadvantages of this new approach, to provide guidance for the production of meaning.

目的 考察合成藜芦醛的方法，并研究微波辐射合成这种新方法的优缺点，为生产提供指导意义。

The work of this paper is as follows: 1. Looking back the progressing history of the linear motor, introducing the features of the elevator driven by linear induction motor, radicating the topic of this paper "the digital frequency variable control of the elevator bi-side direct driven by linear induction motor". The research of this paper covers the conventional VVVF control, space vector based VVVF control, vector control and DTC.

本文主要开展了以下几个方面的工作： 1 回顾了直线电机发展历史，电机的驱动技术演变，特别是针对直线电机的驱动，简要介绍了直线感应电机驱动电梯的优点和不同结构类型，对传统的v／f控制，基于空间矢量法的v／f控制，矢量控制，和基于电压空间矢量的直接转矩控制进行了比较，确立了本课题的研究主题：直线感应电机双边直推式驱动电梯的全数字变频控制。

The article combines with the treatment of a superficial civil air defense work to introduce how the grouting method to improve the performance of the backfill soil.

文章从治理漂浮人防工事的角度提出了注浆技术在改善回填土性质方面的应用，并详细阐述了注浆技术的施工流程。