黄河

Then it defines that thebackground value of soil erosion of the middle Yellow River is 650-1000 millon tons/year according to thetwo-way calculation results of aggradation volume of the river alluvial fan and sediment deposition volumeof the ancient river mouth, after comprehensive consideration and under the conditions of less...

然后根据由黄河冲积扇的堆积量和古黄河口泥沙淤积量两种途径的推估结果，经综合考虑后认为，在历史上人类活动较小情况下，黄河中游土壤侵蚀的自然背景值为每年6.5～10亿t。

This paper mainly from the "Yellow River Cantata" creative motives, 8 movement of the melody tonality of summary and analysis of the PC, and the "Yellow River Cantata" After the meaning of simple exposition.

本文主要从《黄河大合唱》的创作动机，对八个乐章的调式调性进行了简要分析来看它所产生的作用，以及《黄河大合唱》产生后的意义进行了简单的阐述。

Xian Xinghai choral work "Yellow River Cantata" for our modern major vocal created a shining example.

浅谈对冼星海合唱作品《黄河大合唱》的几点认识冼星海的合唱作品《黄河大合唱》为我国现代大型声乐创作提供了光辉的典范。

According to the cutout charactoristic data of the lower reaches of the Yellow River,and using

根据黄河下游1972～1997年断流特征观测数据，应用数理统计的方法，分析了黄河下游断流河长、断流历时和泥沙淤积量之间的相关关系。

With thousands years of diastrophism and human society's development, the natural environment of the upper-part of the Yellow River has conceived its distinguished zoology and resource structure, therefore forms its special geographic upper-part-yellow river region's economy and society development model.

黄河上游的自然环境随着千百年的地壳运动以及人类繁衍，孕育出了独特的生态及资源结构，从而也形成了具有区域特色的黄河上游典型地区经济和社会发展模式。

The reaches of greater dike breach risk mainly distribute in wandering reaches.(4) The dike breach risk of the south bank is relative higher in wandering reaches.(5)The dike breach risk of the north bank is higher than the south bank in winding reaches. Simultaneously, the evaluation results manifest that the evaluation indexes system established from the locomotion of incoming water and sediment load, the regional crustal stability, the evolvement of river regime and the stability of river dikes, can reflect the actual situation of hang river in the lower Yellow River more fully. The application of multi-hierarchical fuzzy

评价结果同时表明，从水沙运动、区域地壳稳定性、河势演变和堤防稳定性4个方面建立评价指标体系，能够更加全面的反映黄河下游悬河的实际情况；运用多层次模糊综合评判法能够较好地解决影响因素众多、作用机制复杂的悬河决溢风险问题；运用GIS技术强大的空间分析功能，使黄河下游悬河不同空间位置的决溢风险得到了量化，可以客观地反映黄河下游河道不同空间位置决溢风险的差别，对于指导防洪和河道治理的实践具有重要的现实意义。

Its rule of change was obtained. On the basis of other studies, the flocculation kinetics and flocs structure was studied. By making some assumptions, collision frequency were presented. Then the the flocculation kinetics model was established through population balance equation. Comparison of experimental data and modeling results indicate that there are the same trend between the two. So the model can predict flocs number and size during flocculation of Yellow River's loess particles without using empirical parameters. The TEM and SEM were used to obsever flocs in the study of floc structure. The flocculation was divided as flocculi, floc and floc aggregate. The flocs structure model was established by assumption that particles position in floc accords with tetrahedron. The fractal dimension of model and experimental flocs was found to be coincident. So the model can reflect the structure of flocs formed in flocculation of Yellow River's loess particles by macromolecule flocculant at a certain extent.

最后，本文还对絮凝动力学和絮体结构进行了研究，在前人研究的基础上，针对高分子絮凝黄河泥沙，对絮凝过程作了一些符合试验条件的假设，建立了颗粒碰撞频率表达式，应用了颗粒数量平衡方程，从而建立了絮凝过程的动力学生长模型，模型计算结果与试验数据对比表明，二者趋势一致，在没有使用经验参数的情况下基本上能够描述黄河泥沙絮凝过程中絮体数量和尺寸分布的变化过程；对絮体结构的研究中，应用扫描电子显微镜和透射电子显微镜对絮体进行了观察，将絮体分为絮粒、絮团和絮网三个不同的生长阶段，通过假设颗粒结合位置符合正四面体，建立了絮体结构模型，计算得到的模型絮体分形维数基本与试验中的实际絮体相符，在一定程度上能眵反映高分子絮凝黄河泥沙生成的絮体结构。

Its rule of change was obtained.On the basis of other studies,the flocculation kinetics and floes structure was studied. By making some assumptions, collision frequency were presented.Then the the flocculation kinetics model was established through population balance equation. Comparison of experimental data and modeling results indicate that there are the same trend between the two. So the model can predict floes number and size during flocculation of Yellow River's loess particles without using empirical parameters.The TEM and SEM were used to obsever floes in the study of floe structure.The flocculation was divided as flocculi,floc and floe aggregate.The floes structure model was established by assumption that particles position in floe accords with tetrahedron.The fractal dimension of model and experimental floes was found to be coincidentSo the model can reflect the structure of flocs formed in flocculation of Yellow River's loess particles by macromolecule flocculant at a certain extent

最后，本文还对絮凝动力学和絮体结构进行了研究，在前人研究的基础上，针对高分子絮凝黄河泥沙，对絮凝过程作了一些符合试验条件的假设，建立了颗粒碰撞频率表达式，应用了颗粒数量平衡方程，从而建立了絮凝过程的动力学生长模型，模型计算结果与试验数据对比表明，二者趋势一致，在没有使用经验参数的情况下基本上能够描述黄河泥沙絮凝过程中絮体数量和尺寸分布的变化过程；对絮体结构的研究中，应用扫描电子显微镜和透射电子显微镜对絮体进行了观察，将絮体分为絮粒、絮团和絮网三个不同的生长阶段，通过假设颗粒结合位置符西安建筑科技大学博士学位论文合正四面体，建立了絮体结构模型，计算得到的模型絮体分形维数基本与试验中的实际絮体相符，在一定程度上能够反映高分子絮凝黄河泥沙生成的絮体结构。

Shrinking lakes and rivers, the Yellow River drying up in the Yellow River from 1972 to the beginning of 1998 there disconnection of the 27 years, the Yellow River Lijin station stop in a total of 21, reached four years of stop-off frequency, for a total disconnection 1,050 days, the average Each year 50 days disconnection, 1997 devascularization 226 days, up to 704 km river drying up of the lower reaches of the chief of 90%.

河湖萎缩，黄河断流黄河从1972年开始出现断流到1998年的27年间，黄河利津站共有21年发生断流，断流频率已达四年五断，共计断流1050天，平均每个断流年份50天，其中1997年断流226天，断流河段长达704公里，占下游河段总长的90%。

After the Yellow River turning thousands of curves and being taken by the sea, the rich and plain operas are still performed in the daily life of the local people.

黄河在经历了千回百转之后，丰富朴实的黄河戏曲仍唱响在黄河人每一天的生活中。

They weren't aggressive, but I yelled and threw a rock in their direction to get them off the trail and away from me, just in case.

他们没有侵略性，但我大喊，并在他们的方向扔石头让他们过的线索，远离我，以防万一。

In slot 2 in your bag put wrapping paper, quantity does not matter in this case.

在你的书包里槽2把包装纸、数量无关紧要。