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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。

While cleaning the rod mechanism do not use absorbent cotton or other fibrous materials.

清洁杆机械时不要用脱脂棉或其它纤维材料。

The effects of desorption time, permeability isothermal absorption curve shapes, pressure difference, oil and gas saturation on the degree of coalbed methane production are calculated and its producing mechanism is analyzed by simulation.

模拟计算了解吸时间、渗透率、等温吸附线形态、压差、含气饱和度等方面因素对煤层气产量高低的影响，分析了煤层气产出的机理。

Mechanism and Influence Factor of Intermittent Absorption

间歇吸收机理及影响因素

The law of water absorption in the process of hot water aging and the effects of different hot water aging conditions on the surface fracture appearances of PCs were studied. The hot water aging mechanism of PCs was discussed.

在老化时间0～200 h内，共取样9次，研究了三种PC在热水老化过程中的吸水规律、不同热水老化条件对PC表面微观破坏形貌的影响，讨论了PC热水老化机理。

The mechanism of PNPP catalytic hydrolysis has been proposed based on the analytic result of specific absorption spectrum.

通过对水解反应体系的特性吸收光谱的分析，表明在PNPP催化水解的反应过程中形成了由PNPP和Co配合物组成的关键中间体。

China should make use of resouce distribution function of public finance, study the foundation of compensation policy of coal resource exploitation, to resolve the problems of enterprises' cost socialization and internal cost externalization in resource exploitation, perfect the market distribution mechanism of coal resource, urge enterprises to apply measures of saving energy and decreasing consumption, lead and encourage the whole society to abstemiously use coal resource, realize the reasonabe expoilatation and using of Chinese coal resource.

应利用公共财政资源配置职能，研究建立煤炭资源开发的补偿政策和措施，解决资源开发中长期存在的企业成本社会化、内部成本外部化问题，完善煤炭资源市场配置机制，促使企业采取措施节能降耗，引导和鼓励全社会节约使用煤炭资源，促使我国煤炭资源合理开发利用。

Abstract－Online group negotiation mode based on credit brings in credit mechanism, provides an safe and convenient trading platform to both vendor and purchaser, and it is an tri-win mode: Consumers can get goods and better service at a favorable price. Network agency can run without stock, be free of the risk of sale and physical distribution, return and exchange of commodities are taken in charge by suppliers, as a result, network agencies reduce the operation risk and cost, and make agency expense. Suppliers can sell a great deal of commodities, reduce operation cost and inventory risk, and get enough profit and many information of consumers with this mode in such a competitive meager profit times.

文中提出的基于信用的网上集体议价模式引入了信用机制，为买卖双方提供了安全便捷的交易平台，是一个三赢的模式：消费者能以优惠的价格购得商品和更好的服务；网络中介没有库存积压，无需承担销售风险，物流，退货、换货均由厂家负责，降低了自己的经营风险和成本，赚取了中介费用；厂商能在竞争激烈的微利时代，利用此通路出售大量商品，减少作业成本和库存风险，获得足够的利润，此外还可以获得大量的消费者信息。

In order to ascertain the allelopathy activity of Trifolium repens on weeds, the allelopathic effect of aqueous extract from the aerial part and root of T. repens under different concentrations on the germination rate, physiological and biochemical mechanism of germinating seeds of Abutilon theophrasti Medic.

为进一步明确白三叶草对杂草的化感作用，研究了不同浓度的白三叶草地上部分水浸液和根部水浸液对苘麻和稗草种子发芽率和种子萌发过程中生理生化机理的影响。

In order to ascertain the allelopathy of T.repens on weeds, the allelopathic effect of aqueous extract from the aerial part and root of T. repens. with different concentrations on the germination rate, physiological and biochemical mechanism of germinating seeds of Abutilon theophrasti Medic.

为进一步明确白三叶草对杂草的化感作用，研究了不同浓度的白三叶草地上部分水浸液、根系分泌物、挥发物对苘麻和稗草种子发芽率和杂草幼苗生长过程中生理生化机理的影响。

On the other hand, the more important thing is because the urban housing is a kind of heterogeneity products.

另一方面，更重要的是由于城市住房是一种异质性产品。

Climate histogram is the fall that collects place measure calm value, cent serves as cross axle for a few equal interval, the area that the frequency that the value appears according to place is accumulated and becomes will be determined inside each interval, discharge the graph that rise with post, also be called histogram.

气候直方图是将所收集的降水量测定值，分为几个相等的区间作为横轴，并将各区间内所测定值依所出现的次数累积而成的面积，用柱子排起来的图形，也叫做柱状图。