地面扩散的

Research usejP.Haggett"s pattern of spatial structure and system, analysis technique of tourism market space and data of spot check to analyze the evolvement of spatial structure and problems of tourism development from six faces, move, path, crunode, significance of crunode, ground and diffuse. The law of the evolvement of spatial structure: First, tourism development keeps rising. Second, AR of xi"an is very big and stable, Xi"an is tourism hotspot and center. Third, origin market space sticks out east, and isn"t continuous. Fourth, tourist proportion of XAZ follows the low of distance decay. Distance decay is very obvious in adjacent zone because of little attraction. Sixth, the spatial distribution of tourist origins has become less concentrated. Tourist origins of east China develop quickly. Three problems: First, tourism development is very unbalance between Xian and its adjacent zone.

西安及毗邻地区的国内客源市场空间结构的研究，采用了英国著名地理学家哈格特描述的空间结构模式与秩序，利用旅游市场空间分析技术，借助市场抽样调查、数量分析，从运动模式、路径、结点、结点层次、地面和扩散6个层方面进行了剖析，归纳总结出5个客源市场空间结构演变规律：(1)旅游业发展整体保持增长趋势；(2)客源吸引半径大而稳定，西安市是全国性的旅游热点城市和旅游中心城市；(3)客源市场分布突向东部，呈不连续分布；(4)游客比重的距离衰减普遍存在，毗邻地区吸引物及自然吸引物吸引力较小，距离率减明显；(5)客源集中度减小，客源市场发展呈现跳跃式增长的演变规律。3个市场拓展面临的问题：(1)西安与毗邻地区间旅游业发展不平衡现象明显；(2)客源市场区位不佳；(3)旅游产品单一老化，类型单调乏味。

The forward finite difference and Newton iterance are used in the light of box model and other heavy gas dispersion models, such as IIT Heavy Gas Models and virtual point source model, to solve the differential equations of controlling heavy gas cl.

文中从控制重气云团扩散行为的微分方程入手，根据箱模型及其他一些重气扩散模型，如IITHeavyGasModels模型和虚点源模型，采用向前插分和牛顿迭代的方法，针对ThorneyIslandTrialNo 。0 0 8试验进行了数值模拟，得到了重气云团外形尺寸和空气卷吸量随时间的变化关系以及下风向固定点处地面最大浓度值。

Considering the practice of Mg melting furnace, a dynamic 3D scene of dust diffusion is implemented, which can represent changes of the aerological condition and changes of parameters of the dust collecting system.

使用VC++语言，创建并实现了瞬时点源和稳定点源在静风、均匀风条件下，受重力及地面边界层影响的粉尘扩散过程以及具有初始能量的粉尘射流扩散过程的虚拟现实。

Then the model is modified, considering the effects of irregular entrainment interface on the top of IBL, and applied to fumigation dispersion over Nanticoke coastal area.

然后考虑混合层顶不规则夹卷界面的作用，应用于楠蒂科克沿岸陆上熏烟扩散问题，将模拟的地面轴线浓度与观测资料以及三个熏烟扩散预测模式的结果作了比较。

The basic principles to determine the chimney height of a power plant are meeting the demand of atmospheric diffusion and saving investment, ensuring the maximum ground concentration lower than the controlling goal of the environment.

确定燃煤热电厂烟囱高度遵循的基本原则是既要满足大气污染的扩散稀释要求，又要考虑节省投资，保证地面最大落地浓度不超过环境控制目标。

The basic principles to determine the chimney height of a power plant are meeting the demand of atmospheric diffusion and saving investment,ensuring the maximum ground concentration lower than the controlling goal of the enviromnent.

确定燃煤热电厂烟囱高度遵循的基本原则是既要满足大气污染的扩散稀释要求，又要考虑节省投资，保证地面最大落地浓度不超过环境控制目标。

From left: blocks of icy debris, warmed by the sun, tumble down cliffs of the northern ice cap; swirling dust devils leave tracks on defrosting dune surfaces in the south; as polar ice recedes, the surface erodes in scalloped ridges; during spring in the north, sand dunes emerge from the blanket of frost; starburst patterns are created as ice warms into gas and expands, creating channels spreading out radially; when the gas breaks through the ice, it creates plumes and material is carried downwind.

从左侧起依次是：冰碎块，由于被太阳加热，从北部冰帽的悬崖上滚落；漩涡状尘暴在南部解冻的沙丘表面留下的轨迹；消退过程中，极冰在地面侵蚀出圆齿状脊；在北部的春季，沙丘钻出&霜毯&；星暴图案是在冰融化成气体并不断扩散时形成的，在此过程中形成的沟槽呈放射状向外伸展；冰从固态变成气态时产生的气羽流顺风飘散。

As the thermonuclear pressure wave spread and butted against the thermosphere, it heated the air orange, compressed it, until it touched the ground and scorched a quarter of the world.

当高热核冲击扩散压迫着热气层，把空气加热成桔黄色，压缩它，直到它到达地面烧焦了四分之一的星球。

As she looked at Warrington's manly face, and dark, melancholy eyes, she had settled in her mind that he must have been the victim of an unhappy attachment.

每逢看到沃林顿那刚毅的脸，那乌黑、忧郁的眼睛，她便会相信，他一定作过不幸的爱情的受害者。

Maybe they'll disappear into a pothole.

也许他们将在壶穴里消失