热力学

Linear solvation energy relation was firstly introduced in the paper, and the method and step of gaining the special parameters of solvent and solute were introduced in detail, and these special parameters were used to selection and optimization of extractive agent in extractive distillation. The model of predicting activity coefficient at infinite dilution was established by linear solvation energy relation. By the above theory, several candidate solvents were selected to separate C5 fraction, and by experiment of vapor-liquid phase equilibrium at atmosphere pressure, the mixture of N-methyl-pyrrolidone including 4% water was used extractive agent of separating C5 fraction. Then binary vapor-liquid phase equilibrium of the some compound in C5 fraction and N-methyl-pyrolidone were determined at atmosphere pressure and correlated by NRTL equation. Isoprene being objective compound, experiments were operated in the laboratory-scale column; the processes were simulated by RadFrac model in ASPEN PLUS. And by the combination of experiment and simulation, the new process of separation of C5 was established.

本文首先对线性溶剂化能关系进行了分析介绍，也介绍了采用溶剂化能关系得到溶质溶剂特性参数的方法步骤，并将这些参数用于萃取精馏萃取剂的选择与优化；也通过线性溶剂化能关系式建立无限稀释活度系数预测模型，取得了一定的预测精度；将通过上述方法初选的溶剂进行了常压汽液平衡的测定研究，通过实验研究选定含水4%的N-甲基吡咯烷酮溶液做为C5分离的萃取剂，测定了大量N-甲基吡咯烷酮与C5组分的二元平衡数据，并进行关联计算；以异戊二烯为目标产物在实验室规模的精馏塔内进行了C5分离的实验研究，取得大量塔内数据；通过选用合适的热力学模型，采用ASPEN中RadFrac模块对分离过程进行模拟研究，通过实验与模拟相结合，建立了C5分离的新工艺，为将来的工业化打下了坚实的基础。

The course begins with the basics of compressible fluid dynamics, including governing equations, thermodynamic context and characteristic parameters.

本课程从可压缩流体动力学的基础开始讲起，内容包括控制方程，热力学背景知识和特性参数。

Engineering thermodynamics is a strongly conceptive curriculum,some of concepts are very abstract and difficult for students to understand.

工程热力学是一门概念性很强的课程，有些概念非常抽象，学生较难理解。

According to phase change theory of thermodynamics, the condensation conditions of reacting solid products are concluded and the productivity and critical size of condensation nucleus are given.

根据热力学相变理论，总结了反应固相生成物发生凝结的条件、凝结核的生成速率和临界尺寸。

The effect of thermal conductance of the component and the contact layer on output power and efficiency was discussed.

建立了热电发电器件工作的一维模型，应用热力学理论分析了发电器件的输出功率和效率，并重点讨论了元器件热导及热端板、冷端板与元器件间的接触层热导对输出功率和效率的影响。

The free energy change defines a thermodynamic force which, in its turn, drives the configurational change of the structure.

自由能的改变定义了一种热力学的力，它反过来驱动结构的构形变化。

The processes of life must obey the law of conservation of matter and the two laws of thermodynamics.

生活的过程必须服从物质守恒定律和二个热力学定律。

In chapter four, in order to study the micro-process of the compress of the high speed oil-free twin screw compressor, a mathematical model is built based on the conservation of mass and the first principle of thermodynamics.

第四章为了深入研究无油双螺杆压缩机的微观工作过程，以质量守恒定律和热力学第一定律为基础，建立了双螺杆工作过程的数学模型。

Refering to a sophisticated proof method in thermodynamics and based on a physics consideration, this article gives a clear and plain proof to the theorem that the conservative force has potential s.

借鉴热力学中的一种方法，用直观的物理论证，给出了保守力具势的充分性证明。

Refering to a sophisticated proof method in thermodynamics and based on a physics consideration, this article gives a clear and plain proof to the theorem that the conservative force has potentials.

借鉴热力学中的一种方法，用直观的物理论证，给出了保守力具势的充分性证明。

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