向西北的

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。

Using the seale separation method, the meso-scale structure of Mcc occ- ured near the Delta Area of the Pearl River is studied. It is shown that there is a meso-scale cyclonic circulation at 1000 hpa level and a meso-scale anticyclon at 200 hpa level associated with the Mcc. The axis of the Meso-scale cyclone center tilts northwestward with height, stretching up to 400 hpa level.

用滤波方法分析了一例发生在珠江口附近地区的Mcc的中尺度结构，结果表明，在对流层下部有中尺度的气旋性涡旋与Mcc相应，涡旋的中心轴线随高度向西北方向倾斜，在地面涡旋的上方200hPa层上，是一中尺度的反气旋性涡旋，中尺度的辐合中心和上升运动中心偏于Mcc的西部，扰动温度场也是非对称的，在对流层上部没有中尺度的暖高压。

The established models in which annual precipitation was incorporated as the principal variable indicate a very closely correlation between forest productivity and its corresponding climatic factors,allowing to simulate distribution pattern of actual forest productivity effectiv...

结果表明：在所构建的模型中，除海拔高度与净生产力的相关模型外，其它模型均有较高的实用价值，模型的拟合曲线变化，基本反映了中国森林现实生产力的地理分布格局；中国森林生产力的分布格局主要取决于气候环境中的水热条件，水分条件是决定中国大部分地区森林生产力水平和地理分布格局的主导因素；根据7个GCMs大气环流模型预测合成的2030年的气候情景，研究气候变化对中国森林生产力影响的结果是：气候变化并没有改变中国森林第一性生产力的地理分布格局，即从东南向西北森林生产力递减趋势不变，但不同地域的森林生产力有不同程度的增加。

In the territory of Xueshan town, there are high mountains and steep inclines as well as valleys and gorges everywhere, with its general topography inclinting to Pudu River from southeast to northwest.

在雪山镇范围内，到处都有高高的山峰和陡峭的斜坡，也有山谷和峡谷，它的地势大体上是自东南向西北方向倾斜至普都河，最高点和最低点分别为高度4247米的骄子雪山和海拔为865米的普都河，这两者之间的相对间隙海拔高度为3382米，镇政府坐落于海拔2650米的地方。

Based on the distribution of sand-moving wind direction, the dominant wind direction of Yangqing station is WSW due to the regional terrain, the others are all WN, WNW, NNW, the results indicate that the main sand moving direction in Beijing plain is from northwest to southeast.

从起沙风动力方向分布来看，除延庆站受区域地形影响是西南西为主导风向，其余站点的主导风向都是西北、西北西、北北西三个方向，说明北京平原地区的沙尘运移方向主要是自西北向东南搬运。

2The natural gas of Ordovician is typical petroliferous gas which came from the same source rock. It is a composite of gas that was generated from the sapropelic parent material of different maturity. Its maturity varied from mature degree to high-over mature degree which decreased from east to west and from southeast to northwest.

2塔河油田奥陶系天然气为典型的油型气，具有相同的来源，为腐泥型母质不同成熟阶段生成气的复合，成熟度范围覆盖从成熟阶段到过成熟阶段，成熟度从东往西、从东南向西北逐渐降低，天然气的产生具有多阶连续的特征。

In addition to revealing Earth's slightly slimmer silhouette, the results reveal that the Pacific seafloor is the most restless place on the planet, traveling to the northwest by around two inches a year.

新的数据除了揭示了地球日渐缩小的轮廓，同时也揭示了太平洋的海底是地球上最活跃的地理位置，每年以两英尺的速度向西北方向移动。

The main rivers are Lechang into the county from the northeast corner, by the flow of Shaoguan Wu Gui Town rivers; originated in the northwest and the Yangshan county border Ah fork top and flows from west to east Nanshui reservoir, through the county, import Beijiang rivers of milk; originated in the north-west county and the junction of Yizhang County, Hunan Province Meng Hang Shi Dong Lu, from northwest to southeast through the Daping, bridges, Bibei, Gui Yang, head into the Wujiang River ; originated in the northern foot of the courtyard of the ant hill rock, from north to south flow through Luoyang, large cloth imported Anglo-German city of Tai Tam River.

主要河流有由乐昌流入县境东北角，经桂头镇流向韶关的武江河；发源于县境西北与阳山交界的丫叉顶，由西向东流入南水水库，穿过县城，汇入北江的乳江河；发源于县境西北面与湖南省宜章县交界的猛坑石东麓，由西北向东南经大坪、大桥、必背、桂头流入武江的杨溪河；发源于天井山北麓的蚁岩，由北向南流经洛阳、大布汇入英德市的大潭河。

He travels northwest to Karakorum before crossing the Gobi Desert. He then travels east through Jarangiiyn and Dalandzadgad before returning to the capital for the annual Naadam festival.

在穿过戈壁沙漠的时候他先是游览了位于西北的古代蒙古帝国旧都遗迹，接着他自西向东穿越了沃里克和多尔比，最后他回到了首都，正好赶上了一年一度的那达慕节日。

The spatial distribution of current extreme precipitation and extreme value with a return period indicate that extreme precipitation decreases from southeast to northwest, there is also a high value in Two-lakes basin, HuangHai bay and Liaotung peninsula.

从当前极端降水分布和给定重现期的极端降水的空间分布来看，我国东部极端降水的区域差异较大，总体上是由东南向西北递减，两湖盆地、黄海海湾及辽东半岛也有高值分布。

The concept of equivalent rotationally rigidity is offered and the formula of rotationally rigidity is obtained.

主要做了如下几个方面的工作：对伸臂位于顶部的单层框架—筒体模型进行分析，提出了等效转动约束的概念和转动约束刚度的表达式。

Male cats normally do not need aftercare with the exception of the night after the anesthetic.

男猫通常不需要善后除了晚上的麻醉。