对换

In order to observe the effect of the inclination angle on operational behavior, a high-temperature heat pipe fin was tested.

为研究高温热管翅在应用过程中倾斜放置对换热设备的性能影响，对一高温热管翅在不同倾斜角度下进行实验，比较分析该高温热管翅在不同角度下起动、稳态运行的工作情况。

Generally,we often use the notions of transposition and cyclic transformation etc for definit-ing deferminant.

定义行列式时，一般要用到对换、置换等概念，置换群还是有限群的一个重要例子，本文对这些概念反轮换作一些探讨，得到了一些结果。

Numerical simulation is used to analyze three-dimensional flow and heat transfer processes.

采用三维流动与换热的数值计算方法对换热器内传热过程的影响因素和机理进行了模拟研究。

The choice principle of the parameters of ultrasonic transducer is studied too.

对换能器的各参数和选择进行了讨论，给出了换能器选择的原则。

Through linearity regression to the concentration curve of Fe,it gets rid of the influence of the concentration changing,and it ensures the current research of wear and failure.

通过对换油后Fe浓度曲线进行线性回归，在系统中排除了换油后的浓度变化的影响，从而为柴油机的磨损趋势和故障趋势的研究提供了保证。

In order to study the geometry effect on the performance of the louvered fin heat exchanger, a two dimensional numerical model is established for air side heat transfer and fluid flow characteristics for a type of louvered fin surface and the related numerical simulation is conducted.

heat transfer and flow characteristics ； numerical simulation ；为研究百叶窗翅片几何结构对换热器性能的影响，采用二维计算模型，对空气流经一种类型的百叶窗翅片的传热和流动特性进行了数值模拟，获得了百叶窗翅片的温度场、速度场和流线图。

It is found that both the air mass flow rate and the ratio of the mass flow rate have a significant effect on the heat exchanger performance.

发现换热器两侧空气的流量比、流量大小对换热器的效率有着重要影响。

The association effect of inert gas and gas phase acetic acid-water in condensing process was considered, the heat and mass transfer behavior of the heat exchangers at every step and the influence of heat and mass transfer on the design of heat exchangers were analyzed for the condensing process of acetic acid, water, and mixed nitrogen vapor in the condenser in the PTA oxidation process.

针对PTA氧化反应中冷凝器内的醋酸、水和氮气混合蒸气冷凝过程，考虑冷凝过程中惰性气体和气相醋酸-水缔合效应，分析了各级换热器内传热传质行为以及传递对换热器设计的影响。

DC power transmission simulationmodel is set up in this paper with the Matlab software, and various faults such as single-phasegrounding short circuit, phase to phase short circuit, three-phase circuit grounding shortcircuit and inverter bridge short circuit are simulated in this model.

用MATLAB软件建立了电力系统直流输电仿真模型，模拟了单相接地短路故障、相间短路故障、换流器桥臂以及单桥故障，经过近百次仿真运行，得出了各种故障下的特性曲线，准确描述了直流输电系统在发生大扰动后的暂态过程，并从理论上进行了科学分析，得出了各种故障对换相失败的影响。

The pulse sequences for achieving some logic operations of cycles and transpositions of quantum states have been devised.

本文的主要工作包括以下内容：●通过分析在核磁共振实验中实现基本通用量子逻辑门的脉冲系列，设计了实现对量子态进行各种轮换操作、对换操作的逻辑部件的脉冲系列，在实验中用这些脉冲系列实现了预先设计逻辑部件的逻辑功能。

Objective: To study the effect of polycythemia on blood oxygen saturation.

裴蕾目的：观察RBC剧增而引起的高粘血症对血氧饱和度的影响。

Based on SIMPLER algorithm in the curvilinear body-fitted coordinates, the calculations were performed for Pr=0.7, Re=10~1000 on non-orthogonal non-staggered grids which are generated by elliptic equation systems.

采用曲线坐标系下压力与速度耦合的SIMPLER算法，数值研究了周期性渐扩渐缩波纹通道内脉动流动与换热情况，流动Re数的范围为10~1000，Pr数为0.7。