逼近

In chapter 2, we define the abstract periodic three level bounded variation functions with range in a Banach space ?

其中第二章定义并研究了实Banach空间取值的抽象三级周期有界变差函数用抽象系数三角多项式逼近的性质。

Now, many methods are used for the computing of latitude, ie, Heikkinnen arithmetic, Ozone arithmetic, polynomial approach arithmetic, ameliorative bowring arithmetic, and so on.

目前，在国内的纬度解算算法有很多，例如Heikkinen算法，Ozone算法，有理多项式逼近算法，以及改进的bowring算法等。

After then Ebola versa spread out in Uganda again ( it happened around 2003) people died in a very short time. It brought out a lot of fears of death within the country, the Government banned up all mass gathering such as introduction, wedding, burial and church service because of it but people are busy moving out, busy with X-mas's shopping and preparation and functions. We thank GOD Ebola is under control now.

随后， Ebola 病毒再此入侵乌干达（在 2003 年的时候曾发生过一次），患者在短短的几天内暴死，整个的国家顿时笼罩在死亡的恐惧中，政府也立即禁止所有的聚集，如婚前的介绍会、婚礼及教会的团契，然而人们还是在百筹无展中奔走，随着圣诞节的钟声日益逼近，人们又奔走忙于圣诞节的大采购、集会及聚会，一切又回复到原来的状况，感谢神， Ebola 病毒终于得到控制。

Finally, the technique for order preference by similarity to solution based on genetic algorithm is also presented and applied, and its evaluation result is reasonable and practical.

论文在最后还提出了基于遗传算法的逼近理想点评价模型，并对其应用进行了尝试，评价结果合理且直观。

When you sense disaster, the best tactic is to confront it candidly.

当你感到灾难正在逼近，最好的战术就是直面它。

Simulations and applications of the identification to the ship cargo weighing model demonstrate the efficacy and efficiency of the proposed algorithm.

仿真及船舶载模型的辨识应用验证了本算法的有效性及较强的非线性逼近能力。

If you stick to do everything carefully, you catch sight of that you will close to the success.

如果你坚持认真的做每件事，你发现你将向胜利逼近。

At the same time, combining with the actual condition of delivery pipeline of our country and some prevalent leak detection and location methods, this paper raised a method, which is based on wavelet analysis and negative- pressure-wave to detect and locate the leakage. Jobs in the paper are as follows:As affected by gas density, pressure, specific heat and pipe material, the velocity of negative-pressure-wave improved depending on the energy conservation. At one time, taking the affection of velocity of gas flow, the location formula was modified in some degree.When locating the leaks with location formula, the iterative approach algorithm was adopted as a new method to increase the location accuracy level of system.Multi-scale decomposition and reconstruction of wavelet transform is utilized to filter the noise of negative-pressure-wave, which was brought by leakage. With the capacity to detect the signal singularity fast and accurately, wavelet transform was used to catch the break point of pressure signal. The work improved the accuracy of At in location formula, accordingly improved the location accuracy.Wavelet is a suitable tool for signal analysis. The distinct character is that the mother-wavelet is of optional. That means choosing different mother-wavelet will get different analysis result. So we studied how to choose mother-wavelet and its scale for signal singularity detection. The method is to choose a wavelet by regularities of the wavelet and the signal.Finally, a plan, which bases on SCADA system for inspection and detection of natural gas leakage, is proposed in the article.

其中，主要进行了以下几方面的工作：针对泄漏产生的负压波在管道中的传播速度受媒介的密度、压力、比热及材质等因素的影响，而非声波在空气中传播的速度，本文利用能量守恒原理，对其进行了修正；考虑到管内气体流速对压力波速的影响，对原始的负压波定位公式进行了一定程度的改进，并在利用定位公式进行泄漏点定位时采用逐步迭代逼近算法，提高了系统的定位精度；利用小波变换的多分辨率分解和重构技术，对采集到的管道发生泄漏时产生的负压波信号进行了降噪处理；并利用小波变换技术对信号奇异点的快速、准确的识别能力，对经上述消噪后的负压波信号进行了奇异点捕捉，精确捕捉的结果提高了定位公式中上下游站点采集到的负压波奇异点的时间差△t的精度，从而进一步提高了定位的精度；考虑到小波变换是一种基波可变的信号分析工具，也就是说，不同的小波基波对信号分析的结果将有很大差别，这势必影响最终的处理结果，因此，我们又对比分析了本课题中小波基及尺度的选择问题，依据规则性系数相似性原理对母小波的选择进行了探索性研究；最后，还提出了基于SCADA的泄漏检测与定位系统的软件开发构想及系统的嵌入方案。

In terms of Cauchy s integral formula of analytical complex function and the three order spline function of complex variable, a general boundary solution method is presented for solving the complex potential field of the flow field around a 2D semi infinite body .

采用复解析函数的Cauchy积分公式和物面复势三阶样条函数逼近，提出了一种求解二维半无限体势流绕流问题复势的通用方法。

The existence and uniqueness of classical solutions to Cauchy problem of approximating equations of the flow equation are also established, which makes the discussion complete.

建立了与这一模型对应的流方程Cauchy问题的逼近问题的古典解的存在惟一性，使得这类问题的讨论完善化了。

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。