Leech’s Politeness Principle

Leech thinks that people sometimes disobey Grice’s Cooperative Principle in order to express themselves politely in interaction.Therefore he postulates the Politeness Principle and believes that it should be obeyed in communication.This paper analyzes his PP by using some examples in daily life.     

The Queen’s Torture and The Winter’s Tale

The further exploration is carried out to have a deeper understanding of King Leontes and his jealousy and violence. Autolycus, the rogue, is given a detailed avaluation so as to reveal his active role in the play and the artistic flavour on the stage. The brave and straight forward lady Paulina is held in high regard because of both of her brilliant words and benevolent actions. The fourth Act of the play is regarded as the excellent part of the play based on its rich and colourful picture of the rural life by the playwright Shakespeare. Since Hermione, the heroine, is the main character of all the main characters, and the fate of hers is the focus of the whole play, so the title of this play is in need of change.     

The Characteristic Polynomial of the Mixed Arrangement

We consider the mixed arrangement which is com posed of the central hyperplane arrangement and a sphere. We discuss the lattice of its intersection set and the relationship between the Mbius function of the mixed arrangement and the original hyperplane arangement. The Mbius function of the mixed arrangement is equal to the positive or the negative Mbius function of original hyperplane arrangement. Moreover, we give an equality of the chambers and the characteristic polynomial for the mixed arrangement.     

杜赫美原理(Duhamel’s Principle)注记

本文讨论内容如下:(1)明确提出了三点解释杜赫美原理.(2)依此,对解数理方程中含有线性非齐次方程及非齐次边值条件的问题的解法作了统一的与自然的论证.     

The Application of Politeness Principle to College English Teaching

This paper introduces the pragmatic basis of politeness principle and analyzes the practical application of politeness principle in College English teaching,according to Leech's six maxims of politeness principle.     

Preparation and Characteristic of Rosin Glycerin Ester and Its Bromide

1 Introduction As a natural and renewable resource product ,rosin andits derivatives have been usedin paint ,vanishes ,printingink,paper and wood products for their fil mforming properties . But rosin is liable to oxidation be-cause of its double bonds . Rosin can be modified by two different methods which are based on the reactionwith carboxyl groups and unsaturated part of the rosin molecular .That is ether esterificationreaction or addi-tionreaction.In this paper ,two modified methods were…     

The coordinated development of China’s inland water transport

The coordinated development is the core of sustainable development, and the hot issue of international research.SInland water transport (IWT) is an important part of the water resources exploiting system and comprehensive transport system under socio-economic context of river basin,and also the country’s sustainable development priorities to achieve resource-conserving and environment-friendly strategy.SThis paper is based on the coordinated development content, combined Germany\"s successful development experience, explored the elements and the problem of the coordinated development of IWT system of China’s national economic strategy and basin economy, water resourse system, comprehensive transport system, and system itself, and their countermeasures and suggestions,in order to facilitate rapid and coordinated development of China\"s inland water transport.S     

车载飞轮电池转子动力学建模与分析

针对车载飞轮电池安装基础运动的特点,本文利用子结构分析的方法,建立了飞轮电池的转子-安装基础动力学模型,提出了安装基础动力学与转子动力学模型的融合方法,并分析了飞轮转子在路面输入引起基础振动变化情况下的动力学特性,从而为车载飞轮电池转子动力学设计提供了理论和计算基础。     

城市电动汽车铅酸蓄电池温度的计算分析

铅酸蓄电池是电动汽车常用的供能装置之一.适合的工作温度范围是蓄电池获得最佳性能和延长使用寿命的重要因素.为了设计蓄电池热管理系统需要,建立了蓄电池生热和散热综合导致的温度变化的计算模型,设定了蓄电池一定的工作环境,以电动汽车城市驾驶循环为负载,计算并分析了不同初始条件下蓄电池的温度变化过程.结果显示,在没有加热或散热的情况下,蓄电池工作温度难以保持在合适的工作温度范围,必须为蓄电池的正常使用设计相应的热管理系统.     

锂离子动力蓄电池充放电基本性能的研究

为了考察锂离子动力蓄电池应用于电动汽车的可行性 ,本文以MCMB和LiCoO2 为正负极材料 ,自行设计组装了 5A·h、2 5A·h和 50A·h的方形层叠式锂离子动力蓄电池 ,用恒电流限电压充放电方法研究了其在不同电流下的放电行为和荷电保持能力 .研究结果表明 :以0 .2C倍率、10 0 %DOD放电时 50A·h电池的质量比能量和能量密度可分别达到 10 7.4W·h/kg和 185.1W·h/L ,已经超过了美国电池先进联合体 (USABC)规定的动力蓄电池的中期开发目标。 5Ah电池的 1C倍率放电容量可保持 0 .1C倍率放电容量的 79.35% .电池的荷电保持性能良好 ,日平均自放电率小于 0 .32 4 % /d ,开路电压月下降只有 0 .1V左右     

混合动力汽车动力电池组参数匹配

动力电池组参数匹配的合理程度决定着电机驱动和再生制动潜能的发挥,同时对混合动力系统成本影响明显。本文研究了混合动力系统在其他相关参数已知前提下的动力电池组参数匹配问题,建立了动力电池组参数匹配体系。基于AVL CRUISE进行了前向仿真,结果表明:所匹配的动力电池组能够很好地满足混合动力城市客车研发需求。     

电驱动车辆发电机-电池组动态建模和仿真

为分析电驱动车辆发动机和动力电池组混合驱动的动态特性,采用等效阻抗法建立永磁同步发电机、整流桥和动力电池组在发电机转子d-q坐标系中的统一动态电路模型,并运用状态方程和直流水阻负载对模型进行了仿真和实验验证.模拟车辆转向工况,仿真得出电池组对减小发动机转速和转矩超调量,平滑直流母线电压剧烈变化效果显著,并能发挥助力和吸收再生制动能量的能力.     

机动车铅蓄电池电解液比重的选择研究

本文在对机动车铅蓄电池电解液的各种特性的研究基础上,就各种不同的气候条件和使用条件合理地选择电解液比重进行了研究。实践证明该研究成果对机动车铅蓄电池的应用具有较强的实际意义。     

傅立叶变换红外光谱仪的原理与特点

阐述了傅立叶变换红外光谱仪的原理,并对红外光谱的特点进行了归纳和总结。     

电动车用镍氢电池模块的充放电模型研究

在电动汽车镍氢电池改进等效电路模型的基础上，基于模糊化电池的荷电状态（SOC），利用模糊推理的方法来估计电路模型的时变参数，并以SOC为模糊输入量，电池模型参数为模糊输出量．由于模糊推理所确定的模型参数根据模糊SOC是动态变化的，因此不仅提高了电池模型的精度，而且降低了对SOC估计精度的要求．仿真试验表明，在不考虑温度影响的情况下，利用该方法所得到的电池模块端电压仿真数值与实测值的最大绝对误差为0．04V，相对误差为0．28％，说明这种变参数不变结构的自适应模型具有很高的可靠性和精确性．     

电动汽车蓄电池荷电状态的卡尔曼滤波估计

对电动汽车剩余里程的预测需要一个准确的蓄电池荷电状态(SOC)值，但目前任何方法都不能精确地测量蓄电池的剩余电量，以计算电动汽车蓄电池的荷电状态(SOC)，在对目前常用的剩余电量计量方法分析的基础上，提出了一种基于电流的测量，然后利用卡尔曼滤波估计递推算法对蓄电池SOC进行实时估计，并在MATLB下进行了仿真。