差分法

The microwave scattered signal of breast tumor is simulated by using our FDTD codes and poles of the scatted signal of breast tumor are subsequently extracted by using Pronys method.

本文首先详细介绍了奇点展开法的背景及其原理，接着应用我们开发的时域有限差分仿真程序得到早期乳房肿瘤的微波散射信号，采用Prony极点提取方法对肿瘤的微波散射信号进行肿瘤特征极点的提取。

In this paper, Difference threshold method and a combination of joint detection algorithm based on wavelet and the amplitude of the slope is .

本文除研究经典信号处理手段差分阈值法外，还研究了现代信号处理理论与技术基于小波与幅值斜率相结合的联合检测算法。

Electrocardiogram; QRS complexes ; detection of characteristic parameters ; difference threshold algorithm

心电图； QRS波群；特征参数检测；差分阈值法

This paper introduce development of integrity monitoringtechnology on WADGPS, specify ERAIM method which apply Kalman filter , some other methods of integrity monitoring technology is gave at the same time, such as auxiliary RAIM method, mid-value select method and pseudo-satellite method.

介绍了广域差分GPS系统完备性监测技术的一些进展，详细叙述了应用卡尔曼滤波和观测值历史记录的ERAIM算法，同时也给出了完备性监测技术的其他一些方法，如辅助RAIM算法和中值选择法、卫星方法等。

First, based on the measurements of absorption cross-section, the absorption characters of the main polluted gases in flue gas were deeply studied, and found that SO_2、 NO、 NO_2、 NH_3 had a character of approximate periods absorption at some wave band, which is a good chance of a new measurement introduced. Secondly, the factors about absorption cross-section of the gases measured, which affect on the measurement precision of DOAS, is studied deeply. The influence of pressure and temperature on absorption cross-section was given special research, and the compensated measures were given to the gases based on the character of the gases. Thirdly, in practical measurement, it must have been satisfied that the monochromator was consisted with the reference spectrum, which was based on absorption cross-section. In order to satisfy the consistency, the technique of reversion in the image was introduced, the reversions of spectrums were realized with wiener filter and noise elimination based on wavelet transform.

首先从吸收截面的测量入手，对烟气中主要的污染气体SO_2、NO、NO_2、NH_3的吸收特性进行详细研究，发现这些气体在局部区域具有准周期吸收特征，这为引入新的测量方法提供了契机；其次，对决定DOAS测量精度的被测气体吸收截面的诸多问题进行了深入研究，重点研究了压力、温度对被测气体吸收截面的影响，并针对被测气体的特征提出了相应的修正措施；再次，在实际测量中，要求所使用的光谱仪必须与以吸收截面为基础的参考光谱相匹配，为了满足匹配这一条件，文中将图像复原技术引入到光谱复原，使用维纳滤波和小波消噪实现了光谱的复原，将复原后的光谱与所使用光谱仪的仪器函数卷积，即可实现；最后，在对DOAS测量原理详细分析的基础上，对传统的最小二乘—差分吸收光谱法进行了详细的阐述，通过实验证实两点：1。

Resealed range analysis method is one of the good tools for studying fractal Brownian motion of time-series data and natural phenomena self-affine fractal, being applied widely for all time-series. In this paper, this method is used to analyze absolute geomagnetic Z component observations at Tianshui Observatory.

重标极差分析法(R/S， rescaled range analysis method)，是研究分数布朗运动及自然现象的自仿射分形的有力工具之一，对于所有时间序列分析都有着广泛的用途。

On the side of exterior deformation monitoring, this dissertation proposes and proves the utility monitoring scheme by using general ground monitoring technology and the method of simplification differentiation polar coordinate survey for large span space structure deformation monitoring. On the side of stress measurement, this dissertation proposes an new method of stress measurement suit for mass concrete triangular frame and discusses shrinkage and creep of concrete how to influence stress measurement, and sets up finally a process how to calculate concrete stress through data for piano wire sensors. Finally, on the side of cable forces measurement, this dissertation discusses principle and measurement technology of frequency method.

在外部变形测量方面，本文提出并验证了一套利用常规地面监测技术监测大跨度空间结构几何变形的实用方案及一种简化的差分极坐标测量方法；在应力测量方面，本文提出了一种适用于大型混凝土三角刚架应力监测的新方法，研究了混凝土的收缩徐变对应力测量的影响，并在此基础上建立了一套由振弦式传感器的测试数据推算混凝土结构应力的流程；在索力测量方面，本文探讨了频率法测量索力的原理及实用测量技术。

An algorithm called initial function method for the solution of differential equation with tension is also given.

推导出了不考虑拉伸和考虑拉伸情况的弹性环形变微分方程，导出了求解不考虑拉伸情况的弹性环形变微分方程的差分方程和算法，还给出了可谓之初参数法的求解考虑拉伸情况的弹性环形变微分方程的算法。

However,most of the current numerical implementation are based on a hybrid finite - element/finite - difference/control - volume solution with the middle - plane model. This kind of model leads to great inconvenience in applications..

但目前的流动模拟软件都是采用基于&中性层&模型的有限元/有限差分/控制体积法来分析z1，所谓中性层是假想的位于模具型腔和型芯中间的层面，其模拟过程如图1所示。

The method of ignition transient interior ballistic calculat ion of solid rocket motor was presented. Many factors influencing the performance of interior ballistic such as e rosive burning,friction,pressure velocity were taken into consideration.

探讨了固体火箭发动机点火瞬态一维非定常内弹道模型，综合考虑侵蚀燃烧、加质、摩擦、压力升高速率等因素对内弹道性能的影响，建立控制方程组并采用隐式差分方法结合特征线法求解，应用VC++。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。