参数变化

This article analyses the application conditions of freezing method, current research status and the problems in thisiold. It, points that it" s necessary to study deep freezing temperature field deeply and discusses the factors which influence the freezing wall such as soil" s nature, moisture content, geological conditions, etc. It introduces the theory, process of freezing method, the distribution of temperature field of freezing method and key thermotics parameters influencing freezing temperature field, it simplifies the deep freezing temperature field model. Through ANSYS, this article founds the deep freezing temperature field model, and simulates the field on vary heat conductivities. It analyzes the results of ANSYS simulation, gains the theoretical value of thermometric holes which is needed by back analysis. Using the simulation temperature and actual value, it gets the equivalent heat conductivity. Then it solves the deep freezing temperature field by the equivalent value, simulates the freezing wall development process and temperature change curve. Against the actual project, the results are favorable.

文中分析了冻结法施工的应用条件，目前对冻结法施工的研究现状和在此领域内存在的问题，指出了对深土冻结温度场进行深入研究分析的必要性；对影响冻结壁形成发展的因素如冻土土性、含水量、地质条件及施工方法等因素进行了论述；对冻结法施工的原理、过程，冻结法温度场的分布情况，影响冻结温度场分布的主要热学参数进行了综述；对深土冻土温度场模型进行了合理的简化，通过ANSYS大型有限元分析软件，建立了深土冻结温度场的模型，对不同导热系数情况下的深土冻结温度场进行了模拟；对ANSYS的模拟结果进行了定性的分析，通过对ANSYS结果的后处理取得了反分析时需要用到的测温孔理论温度值；经过对测温孔模拟温度值和实测温度值的分析，得到了冻结温度场的等效导热系数；使用等效导热系数对深土冻结温度场进行了求解，模拟了冻结壁发展情况和温度场中的温度变化曲线，用所得结果对比工程实际情况，取得了较好的效果。

The analysis of time-lapse data in various acquisition conditions was prop...

在油藏参数反演方面，提出了多种方法来反演储层压力、孔隙度和饱和度变化等。

The influence of ethanol, isopropanol and mixture thereof used during the polyanionic cellulose manufacturing on the structure of alkali cellulose and PAC was studied by means of X-ray diffraction, microscope, 1H-NMR and chemical titrimetry method.

采用X射线衍射与显微镜分析技术研究了天然棉纤维素在乙醇、异丙醇、乙醇－异丙醇等不同有机介质中碱化时，纤维素的润胀程度、吸附碱量及结构参数的变化。

The dynamic characteristics of the toe-in and camber of the rear wheel were measured on the vibration test table. The influences of different input manners were investigated such as the swept input and the stochastic input, the single input and the dual input. And an analysis was made of the testing results and the testing error.

设计制定了基于电－液伺服四通道车辆道路模拟试验台的后轮定位参数测量试验方案，在振动台架上测定该车后轮前束角和外倾角的动态变化特性，研究了扫频信号和随机信号加载和单双侧加载等不同的加载方式对测试结果的影响，并对试验结果进行了误差分析。

The distribution of engaging efficiency, EHD oil film thickness and tooth face wear and their changes along with transmission parameters are presented.

给出了超环面行星蜗杆传动啮合效率、齿面磨损量和弹流油膜厚度的分布规律及其随传动参数的变化规律。

As an example, the transformation parameter of MZC for various scales in different segments of ultrasound medical image is analyzed to realize the ultrasound image segmentation.

回顾了信号的一维小波变换多尺度过零点表征的完全稳定的重建理论，分析了MZC表征与小波各尺度分解的平均功率的关系；并利用医学超声图像的不同区域MZC随尺度的变化曲线参数，实现了医学超声图像的区域分割。

The spark-gap phenomenon is the main RF noise source of electrical railways, which happens when the pantograph-catenary is disconnected transitorily.

模型由离线事件模拟器、放电电压条件判决器、触发源等模块组成，将机车车速、定位点跨距、弓网接触压力、受电弓质量、离线概率等诸多因素作为仿真的输入参数，能反映出机车运行时弓网间电火花噪声的动态变化。

Speaking of the transom unit, its height is a significant design parameter which can influence stress and force obviously.

对于连接构件而言，连接构件的高度是连接构件的重要设计参数，它的变化对构件所受的应力、内力有明显的影响。

The paper analyzed the motion principle of an end-face lapping machine for an optical fibre conneetor,and deduced the expressions for the workpiece′s motion path in relation to its lapping plate and the motion path vise versa,both of which,as shown by Eqs(5) and(6) in the full paper,are trochoid .

推导出工件相对于研磨盘的运动轨迹S1和研磨盘相对于工件的运动轨迹S2的表达式，得出S1、S2均为次摆线，分析了轨迹随相关参数的变化规律。

The relationship between the error signal and gain parameters of PID controller is nonlinear, and , a normal controlled system＇ s step response figure , under the condition of ideal change of the three PID gain parameters in the different time , PID con troller.

但是，目前使用的PID控制器大多仍是传统的线性PID 控制器，其控制信号是通过将参考输入与被调节量的偏差及其微分、积分进行简单的线性组合来生成的，而且PID控制器的增益参数在系统动态响应过程中是固定不变的，不能反映偏差信号的变化l2j。

With Death guitarist Schuldiner adopting vocal duties, the band made a major impact on the scene.

随着死亡的吉他手Schuldiner接受主唱的职务，乐队在现实中树立了重要的影响。

But he could still end up breakfasting on Swiss-government issue muesli because all six are accused of nicking around 45 million pounds they should have paid to FIFA.

不过他最后仍有可能沦为瑞士政府&议事餐桌&上的一道早餐，因为这所有六个人都被指控把本应支付给国际足联的大约4500万英镑骗了个精光。