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As an often used physical model with good theoretical and practical values, StreeterPhelps model has been widely used to study water quality. However, in some special water areas the utilitization of StreeterPhelps model has some limitation as confirming reaeration coefficient often comes from tests in rivers with fast water flow speed with no consideration of wave effects. Furthermore, in practical research in Three Gorges Reservoir, the changing rule of COD appears abnormally. In some water areas far from pollution source, the value of COD changes with time, but does not follow the exponential attenuation rule. This phenomenon can not be explained by former modified StreeterPhelps model.

StreeterPhelps模型是目前进行河流水质研究常用的物理模型，具有良好的理论和实用价值，然而在某些特定水域，该模型的应用受到限制，主要原因是复氧系数的取定多在水流速度较大情况下得到的，而未考虑水面波动对复氧系数的影响，另外，在实际研究过程中发现三峡库区COD变化的规律出现异常：在离排污口相当远的水域，COD随时间变化趋势并不是指数衰减，而是在某个常值附近微小摆动，以往很多修正过的StreeterPhelps模型都无法解释这个现象。

However, in some special water areas the utilitization of StreeterPhelps model has some limitation as confirming reaeration coefficient often comes from tests in rivers with fast water flow speed with no consideration of wave effects. Furthermore, in practical research in Three Gorges Reservoir, the changing rule of COD appears abnormally. In some water areas far from pollution source, the value of COD changes with time, but does not follow the exponential attenuation rule. This phenomenon can not be explained by former modified StreeterPhelps model.

StreeterPhelps模型是目前进行河流水质研究常用的物理模型，具有良好的理论和实用价值，然而在某些特定水域，该模型的应用受到限制，主要原因是复氧系数的取定多在水流速度较大情况下得到的，而未考虑水面波动对复氧系数的影响，另外，在实际研究过程中发现三峡库区COD变化的规律出现异常：在离排污口相当远的水域，COD随时间变化趋势并不是指数衰减，而是在某个常值附近微小摆动，以往很多修正过的StreeterPhelps模型都无法解释这个现象。

extended progressive refinement method as a fast algorithm of radiosity minimize the recomputation time after any virtual scene modification.in this paper,the extended progressive refinement method is studied and implemented in the way of opengl.then the data which can prove the efficiency of the algorithm by changing scene reflectivity and scene geometry during experiment is obtained.in this way,the method is proved to be efficient.

摘 要：当虚拟场景发生变化时，扩展的逐步求精算法作为一种快速的辐射度算法，大量减少了重新计算辐射度所花费的时间。对扩展的逐步求精算法进行研究，并利用opengl对算法进行了实现。通过在实验中对虚拟场景的表面反射率和几何属性进行改变，获得了一些证明算法有效性的数据，从而验证了该算法的有效性。

The stem was cut into several segments away from the pine seeding, arranged and collected in the order of chronology time and distance from where they were inoculated. To separate B.xylophilus coarsely out from the stems and made them into paraffin slices. And be observed under the potics microscope by dyed with safranin-fast green contrast-stain method and PI fluorescence stain method. In order to find out how about the nematode rigour distributing , but also ebb and flow of their amounts after invading the host pine seeding. Seek the pathological changing orderliness of host cells in different position along with the remotion of nematodes. By deeply analysing the variety of host cell nucleolus to estimate whether the host cell took place the programmed cell death after inoculated B.xylophilus.

按时间进程和与接种点上下距离的远近，对松苗分茎段进行粗分离和制作成石蜡切片，分别用番红-固绿双重染色法和碘化丙锭荧光染色法在光学显微镜下观察，以了解线虫侵染后在寄主体内的准确分布和数量的消长，寻找随着线虫的移动扩散，寄主不同部位细胞病变的数量、速度发生的变化规律，并进一步通过分析其细胞核的变化来判定松材线虫侵染后是否能诱发寄主细胞发生程序性死亡(programmed cell death，PCD)。

You look a little lost Simeon. Is the world changing too fast?

你看上去有点失落，是不是这世界变得太快了？

After changing to Oscar that has a four hole spout, which the milk hats too fast and be hard to creat microfoam.

以前EES-200打奶泡大概要非常耐心打一分钟，现在大概20秒次不到就把奶发好了。

PNG is changing fast, but the vast majority of the people remain dependent on subsistence agriculture and live in small villages.

在新几内亚境内，有许多不同族群，其语言超过八百种，大约占了全世界所有语言的三分之一。

On this foundation, application changes control of structural slippery model designed dimensional machine theoretically inertial space contrail coordinates brachial carrier attitude and extreme ungual hand of motion change; of program of control of structural slippery model to overcome afore-mentioned changing controller of structural slippery model trembles brace up defect, add designed an ambiguous controller, with coming to dynamic adjustment to change according to control output of the system the structure slips the coefficient that the fast approach such as modular controller leads, achieve thereby make sure the system is had already answer quickly can eliminate original controller to have again tremble brace up the purpose of defect.

在此基础上，应用变结构滑模控制理论设计了空间机械臂载体姿态和末端爪手惯性空间轨迹协调运动的变结构滑模控制方案；为了克服上述变结构滑模控制器抖振的缺点，附加设计了一个模糊控制器，以根据系统的控制输出来动态调节变结构滑模控制器等速趋近率的系数，从而达到既保证系统具有快速响应又能消除原有控制器具有抖振缺点的目的。

That may now be changing: as the government worries about obesity—which is rising fast among children—and urges everyone to eat less salt, fat and sugar, and more fruit and vegetables, the paucity and unhealthiness of most school meals is striking.

这种状况现在可能在渐渐改变：由于政府担心孩子中愈演愈烈的肥胖问题而要求每个人都少吃点盐、脂肪和糖，多吃些水果和蔬菜，多数学校餐饮的量少和不卫生问题已凸现出来。

Away from those portraits, time is changing fast. Cities cannot wait to be embraced by global consumerism and villages are inescapably drawn into the process of urbanization.

在这些肖像之外，时代的风云一直急速变幻——城市正急不可耐地奔向全球化消费主义的怀抱，而乡村又不由分说地被纳入城市化的浪潮。

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。