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But ISE has some drawbacks:(1) general ISE is too large;(2) with its high output impedance(about 109 Q), only devices with high inputimpedence and low input offset current can be used to match the ionometer;(3) it is difficult to measure weakly direct current or voltage.

针对以上问题，本课题探索研究了一种基于声表面波(Surface Acoustic Wave，SAW)传感器的液相金属离子在线实时检测技术，在实验平台上实现了液相中多种金属离子现场的同步测试和分析。

In the second chapter, modefied Taylor\'s expansion method is studied for solving Fredholm-Volterra integral equations, several illustative examples are given to show the efficiency of the proposed method. More over, by simple algebra, the modified Taylor\'s expansion can also be used to solve integral equations with weakly singular kernel, and the corresponding accuracy is dramatically promoted.

第二章重点讨论了应用Taylor展开方法解Fredholm-Volterra积分方程，通过数值例子，表明了该方法的简单有效性，特别应用于具有弱奇异核积分方程获得了更高精度的解。

The high value of Poisson s ratio and low value of elastic anisotropy ratio imply that the interatomic force in ZrCr_2 is weakly directi...

并计算了层错与位错的弹性交互作用。对ZrCr2Laves相的力学特性和变形机制进行了讨论。

The results show that the calculated elastic properties are close to the experimental results. The high value of Poisson's ratio and low value of elastic anisotropy ratio imply that the interatomic force in ZrCr2 is weakly directional.

结果表明：计算得到的ZrCr2 Laves相的弹性性质与实验结果相近，其泊松比和弹性各向异性系数大小说明ZrCr2 中原子键合的方向性并不强烈； ZrCr2 Laves相的内禀和外禀层错能分别为112 mJ/m2和98 mJ/m2。

Conductometric titration of modified lignin indicate that acidic groups in the modified lignin can be classed into three groups, the strongly acidic group, intermediately acidic group and weakly acidic group.

电导滴定实验得出，改性木素中的酸性基因可以分成三类，即强酸性基团、中等酸性基团和弱酸性基因。

Some conditions for weakly Persistence and extinction are obtained;In the second part, we respectively use C_h space and C_g space theorem to study the existence of periodic solutions of Lotka-Volterra equation with infinite delay, in the end we get the condition of the existense of periodic solutions and estimate the interzone of it.

第二部分利用相空间理论，分别以C_h空间和C_g空间为相空间研究了具有无限时滞的Lotka-Volterra方程周期解的存在性问题，给出了周期解存在的充分条件，并估计出了周期解的存在区间。

Then we found bijections between quadratic form finite automata and input memory linear automata which lead to a way to produce all weakly invertible or weak inverse quadratic form finite automata. In the last section of chapter three, we extend these results to a more general class of nonlinear finite automata (called qusi-quadratic form finite automata).

然后我们建立了建立全体二次型有限自动机与全体输入存储线性有限自动机之间的的一个一一对应L，由于L保持弱逆性（3.20定理），由此我们得到了产生全体可逆二次型有限自动机的方法：要产生一个具有某种可逆性的二次型有限自动机只需产生一个具有同种可逆性的输入存储线性有限自动机，然后作其二次型提升即可。

Establish integrated invertibility theory over it: By R〓R〓 transformation method, we solve the problem of deciding weakly invertibility and finding weak inverse, By founding the bijections between all quadratic form automata and input memory linear finite automata, we find a algorithm to produce all weak inverse quadratic form finite automata.

本文着眼于这些最基本问题，将有限域上的二次型和置换多项式理论引入有限自动机可逆性的研究，构造了一类由二次型构成的非线性有限自动机（3.6定义），称之为二次型有限自动机，我们在其上面建立了与线性有限自动机可逆性理论相对应的完整的可逆性理论：采用线性R〓R〓变换方法，解决了此类有限自动机的弱可逆性判定、求弱逆问题（3.10、3.12定理）、通过建立全体二次型有限自动机与全体输入存储线性有限自动机之间的保持弱逆性的一一对应，给出了产生全部可逆二次型有限自动机的方法。

This paper studies on weak invertibility of a linear finite automata based on its matrix model,gets a full and essential condition on which a linear finite automata weakly and invertibly delays finite steps,and also gives an algorithm whether or not a linear finite automata has weak invertibility .

主要讨论了基于矩阵模型表示的线性有限自动机的弱可逆性，利用矩阵模型得出了线性有限自动机延迟有限步弱可逆的充分必要条件，并且给出了线性有限自动机是否具有弱可逆的算法。

Using variational methods to discuss the number of fixed points of weakly inward mapping satisfying locally Lipschitz condition is one part of this thesis.

利用变分方法讨论满足局部Lipschitz条件的弱内向映射的不动点的个数是本文的一部分内容。

Hanna: That's over now, isn't it?

都结束了，对吗

You must be ill. You look so pale.

你一定是病了，你的脸色苍白。