查询词典 theoretical research

On the basis of summarizing separation method of acetic acid-water system, we studied the azeotropic distillation process of acetic acid-water system, selecting butyl acetate, isobutyl acetate and isopropyl acetate as entrainers. The influence of packing height, ratio of water to entrainer and acetic acid initial concentration to separation effect of azeotropic distillation was studied in detail. Simulation calculations of general distillation and azeotropic distillation were carried out. The influence of reflux ratio, theoretical plate, feed position, feed temperature and feed concentration to distillation process were discussed. Preferred process operation parameter, which had guiding meaning to practical production of distillation process were obtained. Basic data for the process amplifying design of azeotropic distillation tower were provided. Invest and operation energy consumption of two distillation methods were compared. The elementary technical design of azeotropic distillation tower was carried out on the basis of result of simulation calculation. The type of major auxiliary equipments and inner parts of packed tower were selected.The research results are as follows:(1) Butyl acetate, isobutyl acetate and isopropyl acetate could be selected as entrainer, and separation effect was near.

本文在综述醋酸-水体系分离方法的基础上，以醋酸丁酯、醋酸异丁酯、醋酸异丙酯为挟带剂，对醋酸水溶液进行共沸精馏过程研究，详细研究了填料高度、水与挟带剂的配比、醋酸初始浓度等对共沸精馏分离效果的影响；对醋酸-水体系进行普通精馏和共沸精馏过程模拟计算，讨论了回流比、理论板、进料位置、进料温度和浓度对精馏过程的影响，获得了对醋酸-水体系精馏过程实际生产具有指导意义的较佳的工艺操作参数、共沸精馏塔的工艺设计放大的基础数据，并对两种精馏方法的投资、操作能耗进行了比较；同时在共沸精馏模拟计算的基础上进行了共沸精馏塔的初步工艺设计计算，并对填料塔的主要辅助设备及塔内件进行了初步选型。

The theoretical foundation for further research is established. In chapter 6, the flow field of poppet valve and spool valve which are two kinds valve frequently used in hydraulic technique are predicated by finite element method. The flow field structure at different valve opening are illustrated by visualizing images. The effect on the flow noise and energy loss probably caused by vortexes is analyzed quantitatively, the flow channel of the valve is improved.

第六章用有限元方法对液压传动与控制中最常见的两种结构形式的液压阀—液压滑阀和液压锥阀流场进行数值预报，给出不同开口度和不同结构尺寸下流场结构的可视化图像，定性分析涡旋的产生对流体噪声及能量损失可能产生的影响，并对阀的流道结构进行改进。

Research shows that the simulation model can be built by a real simulation of the dynamic process of the actual system, and provides a theoretical basis for reliable control of flash welding machine's power supply.

研究表明，所建模型能够真实的模拟闪光焊接的动态过程，为闪光焊机电源系统的可靠控制提供了理论依据。

In this paper, some mechanical properties of this kind floor system were studied by the experimental research and theoretical analysis.

本文通过试验及理论分析，获得对该楼盖体系的一些基本力学性能的了解。

The research provides theoretical instruction for the wide application of radiant floor heating system.

研究结果对地板辐射采暖系统的推广应用具有一定的理论指导意义。

To research on on-line detecting part dimension, author takes the flank wear and cutting time as the factors to modify theoretical thermal deforming and system's forcing deforming, and develops an artificial neural network system for on-line detecting part dimension.

提出了通过刀具磨损量和切削时间利用人工神经网络对理论热变形和受力变形进行修正从而实现实时在线检测零件尺寸，并且建立了基于人工神经网络的零件尺寸实时在线检测系统。

This need has motivated research on specification formalisms and the associated verification methods and tools, and has led to highly complex theoretical investigations into the concept of program correctness.

这一需求促使了对规范形式及其相关的验证方法和工具的研究。它也导致了对程序正确性概念中高度复杂的理论研究。

My current research is focusing on carbon nanotubes and grapheme; via both experimental and theoretical methods, and trying to apply them to sensing materials .

2005年毕业于信阳师范学院化学系，现攻读兰州大学有机化学硕士，研究方向：碳纳米管和石墨烯的化学修饰以及理论模拟，并把这些功能化的材料应用于气体传感材料。

On the basis of the findings, the thesis, entitled Researches on the Current Normal College and University Students' Ideological and Political Education Effectiveness, combined the present normal college and university students' thinking features and the writer's personal working experiences, probes what factors influence and restrict students' ideological and political education effectiveness in the light of the view of scientific development, with the aims that the research may provide some theoretical references and practical guidings for improving education effectiveness. The thesis may be divided into four parts.

因此，本文以&新时期高师院校学生思想政治教育实效性研究&为题，紧密结合当前高师学生思想特点和本人所从事的工作实际，剖析影响和制约高师学生思想政治教育实效性的主要因素，以科学发展观为指导，力争在增强高师学生思想政治教育工作实效性方面提供一定的理论参考和实践指导意义。

With literature reference and theoretical analysis as the main research approach, combining her own practice of piano performance, the author of this article studies and analyzes the performance and teaching of impromptus in the aspects of perception and reason.

本文运用文献参阅和理论分析为主要研究方法，结合自己的弹奏，从感性和理性相结合探析即兴曲的演奏与教学。

In the negative and interrogative forms, of course, this is identical to the non-emphatic forms.

。但是，在否定句或疑问句里，这种带有"do"的方法表达的效果却没有什么强调的意思。

Go down on one's knees;kneel down

屈膝跪下。。。下跪祈祷