参数变化

Based on the radar dense data of convectional cloud on June 12,2004 in Yongdeng county,choosing two similar convectional clouds as seeding and non-seeding cloud,the remarkable changes of radar echo parameters of the seeding cloud compared with the non-seeding cloud were discussed in this paper,and the rain enhancement effect was evaluated primarily with ground observational rainfall data.The results show that many aspects of the seeding cloud,such as precipitation,life characteristic and vertical characteri...

利用2004年6月12日甘肃省永登县雷达观测对流云的加密资料，选取了2次相似对流云过程分别作为目标云和对比云，探讨了目标云作业前后较对比云雷达回波有关参数的显著变化，并结合地面雨量点观测资料对地面人工增雨作业效果进行了初步分析，结果表明：目标云在降水、生命期特征、回波垂直特征参数变化方面，表现出作业前后较对比云存在明显差异，目标云作业40 m in后地面产生0.6 mm降水，而对比云则从新生发展到减弱消散阶段经历较短的时间(30 m in)，地面并无降水产生，从而推断本次人工增雨达到了一定的预计效果。

The changing laws of overall stress level accord with varying of structural parameters of floor plate, head plate, jobbing sheet, standing partition board and side plate of inlet port and exhaust port were investigated, character rules of cylinder head's stress varying with parameter changes were gained in the thesis.

在对气缸盖结构参数的研究中，分析出气缸盖的底板、顶板、中隔板、缸体丝对立墙、进排气道以及进排气侧壁的总体厚度变化对气缸盖整体应力水平的影响规律，分析总结了气缸盖应力随这些结构参数变化收敛的特性规律。

Based on the linear model of governing object,this paper calculates the turbine transfer coefficients and six Ki parameters of generator in different work point,and the effect of these changing on latent root are calculated.

以调节对象线性化模型为基础，从1个实例计算入手，计算了不同工况下水轮机传递系数和发电机6个参数的变化情况，进而计算这些参数变化对调节对象特征根的影响。

Firstly,using the method of concentrate mass this paper establish a non-linear dynamics model of a two-stage gear train with backlashe between the gear pair,and through analysed the dynamics model,the torsional motion differential equations are got , on this basis,then calculate the torsional motion differential equations using Runge—Kutta method ,and discuss how to influence the dynamics characteristic of system when these parameters chage such as mesh frequentcies、 stiffness of the intermediate shaft、the ration of mesh frequentcies.and discuss when the chaos will happen under the change of these parameters.

首先用集中质量法建立系统的含间隙的非线性动力学模型，并根据牛顿力学定理，得到系统的运动微分方程。然后对所建立的运动微分方程运用四阶变步长Runge—Kutta方法进行了求解，并对计算结果进行分析，研究了齿轮啮合频率、中间联接轴的刚度，一、二级齿轮的啮合频率比等参数变化时，对系统非线性动力学特性的影响规律，并讨论了当参数如何变化时会导致系统的混沌响应的出现。

Both the comparability in millennial scale with the deep sea oxygen isotope record and the consistency with summer in solation change at 65°N show evidently that the climatic change of the paleo-monsoon in Asia was also driven by the changing period of orbital parameter and by the change of global ice amount.

黔桂地区25万年来的气候在千年尺度上与深海氧同位素记录的可比性，及与N65°夏季太阳幅射能量变化的一致性，显示了亚洲古季风的气候变化规律，同样受轨道参数变化周期以及全球冰量变化所驱动。

The variations of machine parameters, due to operation temperature, saturation level of rotor flux , rotor time constant, etc., lead to poor dynamic performance and incorrect stationary point of operation.

由于系统运行过程中的温升、磁饱和等因素会导致电机的参数发生变化，参数变化势必会影响拖动系统的动态性能并且可能会导致系统的不稳定运行。

In this method, the sensitivity is performed to find the design parameter. The approximation of natural frequencies is given by the Taylor expansion with respect to the design parameter.

该方法通过对结构进行敏感度分析，确定结构中最为敏感的参数，由泰勒展式给出结构的固有频率变化与敏感参数变化之间的近似对应关系。

The result shows that the specific thrust performance of ITB engine is better;the specific f uel consumption curve is toning down with the varied cycle parameters mentioned above, the range which cycle parameters can b e selected is wider than that of conventional engine.

结果表明：这些循环参数变化时，涡轮级间燃烧室发动机单位推力增长幅度较大，耗油率性能变化曲线趋于平缓，发动机综合性能提升，循环参数的可供选择范围变宽。

This paper analyzes the trends and variations of cross-section profile parameters in lower Yellow River with the methods of time series analysis. The analysis results show that since 1950s, cross-section profile parameters in lower Yellow River have change with trend, especially after 1990s, the bankfull discharge and bankfull area all show decreasing trends at all the four stations. The bankfull width at Huayankou, Gaocun and Lijin station and the average depth at Huayuankou and Aishan station and the maximal depth at Gaocun station show decreasing trends while the bankfull water level at Gaocun and Aishan station and width-depth ratio at Aishan station show increasing trends.

本文采用时间序列分析的方法对黄河下游河道断面形态参数变化趋势及其变异点进行了分析，分析结果表明从20世纪50年代以来，断面形态参数发生了趋势性变化，特别是90年代以来各站平滩流量和平滩面积均有显著的下降趋势，花园口站、高村站和利津站平滩河宽出现了显著下降趋势，花园口站、艾山站平均水深显著下降，高村站和艾山站的平滩水位显著抬高，艾山站的宽深比也有显著增大的趋势。

The simulation of field data indicates that this method avoids the effects of parameter variations by letting AFC and AGC to adaptively track the parameters variations for reducing disturbances. It ensures a good performance in decoupling,and improves the precision of flatness and gauge control.

现场实际数据的仿真结果表明，该方法的应用消除了参数变化产生的影响，使板形板厚控制系统具有良好的自适应跟随参数变化和抗干扰性能，解耦控制效果良好，提高了板形板厚的控制精度。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。