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The formation mechanism of the absolute instability and gyrotron backward wave oscillations is analyzed, and the methods to suppress the parasitical modes are discussed.The nonlinear theory model of gyro-TWT is consummated by considering the influence of tapered magnetic field and waveguide radius, electron velocity spread, and waveguide loss on electron beam-wave interaction. The large-signal characteristic of gyro-TWT, such as launching loss and absolute instability, are also analyzed in detail. This work establishes the foundation for the development of a gyro-TWT amplifier.

重点研究了两段损耗波导结构和损耗陶瓷结构回旋行波管中的电子注-波互作用，分析了绝对不稳定性和回旋返波振荡的形成机制和抑制寄生模式的方法；完善了回旋行波管的非线性理论模型，并考虑了磁场和波导半径渐变、速度零散、波导损耗等因素对注-波互作用的影响；详细分析了发射损耗、相位稳定性等回旋行波管的大信号特征，为回旋行波管放大器的研制奠定了基础。

Based on successful experience, we will choose several adult education organizations as seed and research targets and take down progresses and outcome of such organizations. Continuously, we are going to spread adult education organization innovation management around by holding seminars to move up academicism.

因此，本研究第一已了解成人教育机构创新经营的现况，并且透过与具有创新经营成功经验的成人教育机构访谈、经验分享，归纳出成人教育机构创新经营的内涵、方式，且据以发展衡创新经营的指标。

Rather, low-quality mortgages acted as an accelerant to the fire that spread through the entire financial system.

准确地说，低质量抵押在席卷整个金融系统的大火上又浇了一桶油。

It has a favorable business environment, and extensive and wide spread market access to the world economy.

香港是世界上最自由和开放的经济体系，具有比较完备的法律制度，有着良好的营商环境和广泛的国际市场联系，拥有一大批熟悉国际经济的人才。

Presumably the faith was carried from Bactria to Media, whence it spread into Persia and was accepted in all probability by the great Achaemenian kings.

大概是信仰是从巴克特里亚媒体，何处它传播到波斯和被接受的所有概率的巨大阿契美尼德王朝国王。

Through signal factor and orthogonal experiments manufactures of cheese spread s with direct acidification was investigated in this paper.

通过单因素实验和正交实验对用直接酸化法制作涂抹型干酪的方法和工艺进行了初步研究。

And it has been increasingly concerned by local government that how to effectively prevent the spread of Aconitum leucostomum, improve rangeland utilization and develop animal husbandry.

如何有效地防止白喉乌头的蔓延，提高草地利用率，发展畜牧业生产，是当地各级政府十分关注的问题。

These proteins not only limit virus replication and spread or cause infected cells to undergo apoptosis, but also induce consequently expression of cytokines and chemokines to initiate acquired immunity.

这些蛋白质分子通过多种方式造成被侵染细胞表现出特殊的状态或迅速凋亡，从而控制病毒的复制和传播，同时诱导产生大量细胞因子和趋化因子等，启动适应性免疫反应的进程。

Based on the theoretical framework of the leakage and spread of such poisonous and harmful substances as glycol and acraldehyde, this paper advances the graphic simulation of GIS of poisonous and harmful substances.

以石化企业乙二醇、丙烯腈装置产生的有毒、有害物质泄漏、扩散和污染范围的理论模型为根据，提出有毒、有害物质的地理信系统扩散图形模拟方法。

This use of the word spread across the country in the next few years.

这一词的使用推广到全国国，在未来数年内完成。

I didn't watch TV last night, because it .

昨晚我没有看电视，因为电视机坏了。

Since this year, in a lot of villages of Beijing, TV of elevator liquid crystal was removed.

今年以来，在北京的很多小区里，电梯液晶电视被撤了下来。