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Therefore, the moist potential vorticity analysis associated with the mesoscale convective system was researched in the paper, so as to reveal the moist potential characteristics of mesoscale convective system in typhoon circulation. The results showed that, during the generation stage, convective instability characterized by MPV1 was a favorable condition for forming MCS, while the vorticity which was caused by the slantwise isentropic surface and the vertical shear of the horizontal wind characterized by MPV2 was an inspiring mechanism. The specific process was that, the atmosphere exhibited the feature of strong convective instability at the low level of convection areas and the southeast areas, which included plenty of erratic energy. The slantwise ascended the stream transfer the erratic energy to northwest, where the stratification stability was small. As decreased, the cyclonic vorticity increased. On the other hand, the vorticity caused by the slantwise isentropic surface and the vertical shear of the horizontal wind inspired the release of convective instability and as a result that the MCS formed. During the development stage, the cyclonic vorticity increased quickly with the persistent decreasing of . Meanwhile, the inclination of isentropic linewas bigger than the absolute momentum line at middle level, which exhibited the feature of conditional symmetric instability , then the conditional symmetric instability was forced to release by the vorticity resulted from the slantwise isentropic surface and the vertical shear of horizontal wind, and the MCS developed.

结果表明，在对流形成阶段，MPV1即对流不稳定为MCS的形成提供背景不稳定条件，由MPV2即湿等熵面的倾斜和水平风的垂直切变而引起的涡旋发展作为强迫机制：MCS形成的区域及东南区域中低层是强对流不稳定层，蕴含丰富的不稳定能量，倾斜上升运动把对流不稳定区具有强不稳定能量的暖湿空气向西北中层的中性层结区输送，由于的减小，气旋性涡度增强，有利于形成对流，另一方面，由于湿等熵面倾斜和低空急流加强而引起的涡旋发展作为一种强迫机制激发对流不稳定能量得到释放，从而形成对流；在对流系统地发展阶段，由于低层的对流不稳定性进一步减弱，进一步减小，气旋性涡度进一步增强，有利于MCS的增强，中层等θe 线的倾斜度比绝对动量M 等值线的倾斜度大，对应有条件对称不稳定区域，满足条件对称不稳定条件，在湿等熵面倾斜和台风低空急流作用下引起的涡旋发展强迫对称不稳定能量释放，从而使得对流得以维持和加强。

Based on junction phenomena over debris areas, types and features at conflux of different areas are obtained.

本文首先研究了整个泥石流流域上发生的汇流现象，从泥石流产生区、流通区以及堆积区对泥石流汇流的形式和特点进行了总结。

Class I areas shall be defined as areas in continuous view of the operator.

一级区域为经常可被检测者看到的区域。

The agriculture soils of Baimahu ,Lushan and Zoujiao are the typical cases in the suburbs of Changde. Rice soil and vegetable plot are the two typical agriculture soils, we collected 6 samples according to the scientific method in these three areas. After air dry, contuse, screen and make soil samples, we tested their 9 indexs of PH, organic-substance, total phosphorus, quick-acting phosphorus. Then analysed the fertility condition of these areas. Then apply feasible suggestion of fertilizer after putting forward science and suiting measures to local conditions etc, by Compare with the documents and materials. Absorb to Model TAS-986 atom spectrophotometer examine with flame law (air - acetylene ) terms of potassium make deep discussion especially.

白马湖，芦山乡和陬郊的耕作土壤是常德市郊区耕作土壤的典型代表，在这三个地区分别就水稻土和菜地这两个基本的土地耕作类型按科学的方法共采集了6个样品，经过风干，研碎，过筛制成土样后，测定了它们的PH，交换性酸，有机质，全磷，速效磷等9指标，从而对该地区耕作土壤肥力状况进行分析，对比文献资料，总结分析结果，针对不同地区不同的土壤状况，提出了科学施肥，因地制宜等可行性建议，尤其是对TAS—986型原子吸收分光光度计用火焰法测钾的条件作了深入的探讨。

On the basis of life cycle of tourist areas, the author inquires into the evolution law in the course of its evolution, while the images of tourist areas are to evolve with the evolution of tourist...

本文以旅游地的生命周期理论为基础，探讨旅游地在其演化过程中的旅游形象演化规律。

Low degree-day factors can be expected for cold-dry areas, whereas, high degree-day factors can be expected for warm-wet areas in western China.

总体看来，西部冰川的度日因子由西北向东南逐渐增大，这与中国西部冰川的气候环境变化趋势是一致的，即在干冷的气候条件下，度日因子较小；而在暖湿的气候条件下度日因子较大。

Regions and units directly benefiting from flood storage and detention areas should bear obligations of compensation and aid to flood storage and detent ion areas as required by the state.

因蓄滞洪区而直接受益的地区和单位，应当对蓄滞洪区承担国家规定的补偿、救助义务。

Furthermore, social progress and IT advancement strengthen the urban spatial diffusion. Such diffusion effect and the increasingly constant exchanges between city and its surrounding areas accelerate the extension of city and the integration of urban and rural areas.

随着社会进步和和信息技术的发展，加强了城市的空间扩散能力，城市空间扩散的效应和城市与周边区域间的交流日益频繁，加快了城市向外的拓展，促进了城乡间的快速融合。

Such diffusion effect and the increasingly constant exchanges between city and its surrounding areas accelerate the extension of city and the integration of urban and rural areas.

由于城乡融合区位于中心城区与外围典型农业区之间，具有城市与乡村的双重特征，是城市向乡村的过渡带。

The nominated areas contain the best and largest remainning examples of atlantic forest in the region of brazil,the dight protected areas that make up the site combined in a forest archipelago context to reveal a pattern of evolution of great interest to science and importance for conservation.

提名区域拥有巴西地区现存最佳及最大的大西洋森林物种，拥有森林岛屿一体化的受保护区域，从而展示科学上倍受瞩目的进化模式及重要规则--优胜劣汰。

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。