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The rules of the cold-test characteristics changing with helix pitch are also studied and it turns out that, with increasing helix pitch, the phase velocity increases linearly, the interaction impedance changes nonlinearly and the attenuation constant decreases nonlinearly. At the same time, with the limitation of the synchronism between the electron beam and the electromagnetic wave, the change of pitch is small and therefore an approximate linear relation can be introduced.

研究表明：相速几乎随螺距增大而线性变大，互作用阻抗与螺距是非线性的关系，衰减常数随螺距增大而非线性地减小；由于在维持电子注与电磁波速度同步的限制下，螺距变化的幅度不可能很大，因此可近似按线性关系来处理互作用阻抗及衰减常数与螺距之间的关系。

As a result of limitation on theoretical level of author, the extend of research view is deficient in depth and extent.

由于笔者理论功力有限，本文研究视野的拓展在广度和深度方面均有所欠缺。

We firstly summarize the NN system modeling methods and the popular optimization algorithms, and point out the deficiencies, the limitation of noise cancellation modeling and the need of human intelligence participation, in our former optimization work after analysis. An abstract problem is extracted. It is to find out control variant that makes system output optimized using the data comprising a sample set with N x samples and their corresponding y, and it does not explore given system and achieves full automatic computation procedure. Next we propose a multi-variant controlled system optimization method utilizing CASSANDRA-I small type neural computer and program its application software. Moreover systematic experiments are made to demonstrate the method's validity, ability of noisy samples disposal and practical application.

我们总结了神经网络系统建模方法以及得到广泛采用的优化算法，并分析指出我们前阶段的优化工作中存在的去噪声建模有局限性和计算过程需人干预的不足，在此基础上把问题抽象为：已从系统获得含N个控制量样本的样本集S以及每个样本对应的系统输出，如何依据这些数据求出一个使系统输出y得到优化的控制量x，而不研究具体系统，实现不需要人智能参与自动完成的计算过程；提出应用人工神经网络硬件系统——CASSANDRA-I小型神经计算机的多变量控制系统优化方法，设计完成了其应用软件；并进行系统的实验工作，验证算法的有效性以及此方法处理带噪声样本和实际应用能力。

Image interpretation expert system using both the spectrum information carried by RS imagery and the knowledge of experts or the auxiliary geographical data, is a effective way. But the difficulties in knowledge acquisition and the regional limitation of knowledge impede the practical use of this method.

在遥感光谱信息的基础上，加入地理辅助信息和专家的地学知识进行专题分类是提高精度的一个有效途径，但专家知识的获取和专家知识的区域性严重影响了方法的实用价值。

But at the present time it can not be found out speedily and availably because of the limitation of the technology and concepts.

数据挖掘正是为解决这一问题应运而生的一种知识发现技术。

Firstly, it analysed theory and limitation of research of avionics integrated simulation system confidence evaluation.

首先， 分析文献中航空电子综合系统仿真可信度研究的理论方法及其存在的缺陷。

But things develop in the opposite direction when axiomatic system is extremely perfect and the limitation is bigger. This will offer a chance for scientific revolution and lead to changes in axiomatic system.

但事与愿违，越是形式化的公理体系发现其理论的局限越大，出现矛盾的可能性越大，这就为科学理论变革，即公理体系的变换提供了契机，也就是提出了新的科学问题，使科学认识进入到一个新的境界。

X1 F5 W- BAble to work under high pressure and time limitation.

能够在高压力下和时间限制下进行工作。

Hence, a limitation of our study is that there are no aailable data from the SENTRY trial for blood isolates, and subsequently, we could not perform our sensitiity analysis with a focus on patients with bacteremia.

因此，限制我们经验的是得不到为血液分离的SENTRY试验数据，后面的，我们不能对菌血症病人进行敏感性分析。

Behind overlapping pictures, there hide noun or verb, subject or predicate, nonsense, slogan or cant, advertisement or lie, epigram or balderdash, explanation or rhetoric, dialogue or monologue. The unordered, dense, overlapped, and information store-like visual and dream system implies the real world and the desire, anxious, love, hate, limitation, compassion and idealism of the artist.

重重叠影的画面中潜伏着名词或动词、主语或谓语、闲言碎语、标语或黑话、广告或谎言、警句或梦呓、解说或修辞、对话或独白……这个无序的、密集的、重叠的、信息库般的视幻系统，隐喻着世相的繁杂纷纭和艺术家本人的欲望、焦虑、爱憎、局限、悲天悯人以及理想主义。

Since historical times,England ,where the early inhabitants were Celts, has been conquered three times .

从有历史以来，英国，在此地早期居住的是凯尔特人，已经被征服了三次。

Bluetooth OBEX File Transfer Enables the sending and receiving of files on your phone via Bluetooth.

蓝牙OBEX文件移动允许经过蓝牙传送和接受文件。。。。