数学分析

The stress distribution on the wall of directional well is analysed, and a borehole stability model for the formation with dip angle in directional well is established. The influences of dip angle and trend on borehole stability are discussed.

建立了弱面地层数学模型，分析了斜井井壁岩石应力状态，推导出了井壁岩石最大主应力与低强度地层法向夹角的计算公式，建立了用于大倾角地层钻井液密度安全下限的力学模型，详细分析了倾斜地层的倾角和走向对井壁稳定性的影响。

Using the model, the relationship between wobble plate's angle and compressor's displacement is given.

在动力学分析的基础上，建立了排量控制机理分析用数学模型，给出了斜盘倾角α与排量之间的定量关系。

The main circuit of the direct voltage type SVC consists of the autotransformer with average voltage, fixed branch which can compensate the reactive power and filter the harmonic, dynamic branch which can compensate the reactive power and filter the harmonic, capacitive AC thyristor no contact switch and the measuring and controlling system of

自耦均压变压器作为SVC中的主要器件，本文通过变压器的短路试验以及编程进行多项式拟合，建立了其漏抗随电容器组投切级数变化的数学模型，进而做了自耦均压变压器与相同容量相同变比的双绕组变压器有功损耗的比较，分析了36抽头自耦均压变压器在一组电容器全部投运时的空载特性，并对SVC的静态性能进行了全面分析。

In Chapter 2, a simplified analytical model is presented for the analysis of the BVI mechanism, adopting the Beddoes' prescribed wake model. By this model, the azimuthal location and miss-distance of the BVI and the radiation directivity of the BVI noise are calculated and discussed, and some conclusions are obtained.

在第二章，使用Beddoes预定尾迹模型，建立了一个用于旋翼桨-涡干扰特性机理分析的简化数学模型，分别对旋翼桨-涡干扰位置、桨-涡干扰距离和声辐射方向性等进行了计算和分析，得出了有意义的结果。

Based on the relative theories of biomathematics, a new approach to trend extrapolation of time series of ecological footprints is proposed in this paper. Materials for analysis were taken from the agricultural areas of oases in the Hexi region of Gansu province as an example.

应用数学生态学的有关理论与方法，结合生态足迹的概念，提出了一种生态足迹时间序列的新的趋势外推分析方法；并以甘肃省河西绿洲农业区为研究对象，对其生态足迹进行了趋势外推分析的实例计算。

We can find from the research that the IR and XRD spectrogram shows the exists of H_3BO_3 on the surface of cellulose;there is H~+ released form the solution and the complexation proportion of the boric acid-glucose in the solution is 1:1, the boric acid-mannitol is 1:2 and the boric acid-N-methylglucamine is 1:2;and the half experienced mathematics model experiment on analyzing PH shows that the cellulose's adsorption of the boracic acid is mainly chemical adsorption with a proportion of 1:1 while physical adsorption with the H~+ released during the reaction plays a role as assistance.

研究结果表明，通过IR和XRD谱图分析，表明纤维素上吸附了H_3BO_3；硼酸和葡萄糖、甘露醇、N-甲基葡萄糖胺在水溶中络合比分别为1：1，1：2，1：2，同时溶液中有H~+释放出来；应用半经验数学模型分析pH值-浓度吸附实验，表明纤维素对硼酸主要以化学吸附为主吸附比为1：1，以物理吸附为辅，反应过程中释放出H~+。

Through an in-depth analysis of modification theory for the top profile together with its purpose, the modification principle and the design principle of the discharge port are presented. The boundary curve equation of the maximal area of discharge port is deduced in theory and the corresponding mathematical model is established.

通过对齿端修正理论及目的的深入分析，确定了齿端修正的原则，并提出了型线齿端修正的涡旋压缩机排气孔的开设原则，详细分析了排气孔理论上最大开设区域，并推导了区域边界方程，建立了相应的数学模型。

This paper introduced a cartridge pressure reduction valve with large capacity and low control pressure and good stability which is used in a warship s lubrication system.

介绍了一种新型的控制压力低、流通能力大和稳定性好的插装式减压阀，并运用非线性分析方法建立了插装式减压阀的数学模型和MATLAB仿真系统，分析了插装式减压阀的稳态特性和动态特性的影响因素。

With introducing kinds of ways of show colour in computer and chromatology, the paper find out different math regression equation on a base of hue, brightness and saturation to describe psychological sense about different colour, and then with help of computer to describe the psychological sense.

心理视觉分析部分则介绍了计算机和色彩学的表色方法，利用色彩的色相、明度和纯度三属性，采用不同数学回归经验公式，把色彩心理视觉数字化、公式化，进而利用计算机对流行色进行视觉分析，最后得到文字解读信息。

Later, it makes some comparison with four kinds of modulation technique, and finally, it implements the three-level PWM switching power amplifier with the PWM technique. The power of the amplifier is 2kVA, and the frequency bandwidth is 10～3kHz. In the thesis, the author designs and makes the hardwares of the switching power amplifier. The hardwares contain power inverter rank circuit, control system circuit based on DSP, drive and isolation circuit, and protective circuit. The thesis also analyses the potential safety problems and put forward some solutions for the problems. Furthermore, the thesis accomplishes the software design of the control system, and successfully debugs it. The methods of designing higher power ampilfier are also discussed in the thesis. It analyses the feasibility of the methods, outlines the way of how to design higher power switching power amplifier, and does some experiments with the method of switches-parallelling.

根据电动振动试验系统对开关功放的要求，提出了以电感电流瞬时值控制技术为基础的三电平脉宽调制开关功放的设计方案，并通过系统仿真进行了原理性论证；然后设计并制作了开关功放的硬件，包括功率转换电路，基于DSP的控制电路，驱动、隔离电路以及保护电路；针对开关功放数学模型不易得出的特点，细致分析了模糊自适应PID控制方法，在此基础上编写了控制程序；研制出一台功率为2kVA，通频带为10～3kHz的三电平脉宽调制开关功放；论文中还探讨了实现大功率开关功放的方法，分析了各种方法的可行性，给出了实现大功率开关功放的思路，并进行了并联开关管实现大功率开关功放的实验。

We have no common name for a mime of Sophron or Xenarchus and a Socratic Conversation; and we should still be without one even if the imitation in the two instances were in trimeters or elegiacs or some other kind of verse--though it is the way with people to tack on 'poet' to the name of a metre, and talk of elegiac-poets and epic-poets, thinking that they call them poets not by reason of the imitative nature of their work, but indiscriminately by reason of the metre they write in.

索夫农 、森那库斯和苏格拉底式的对话采用的模仿没有一个公共的名称；三音步诗、挽歌体或其他类型的诗的模仿也没有——人们把&诗人&这一名词和格律名称结合到一起，称之为挽歌体诗人或者史诗诗人，他们被称为诗人，似乎只是因为遵守格律写作，而非他们作品的模仿本质。

The relationship between communicative competence and grammar teaching should be that of the ends and the means.

交际能力和语法的关系应该是目标与途径的关系。