This paper studied the flocculation of yellow river ' s loess particles from morphological characteristics by fractal theory and computer simulation technique . the contens concluded the formula of macromolecule flocculant dosage and automatical dosing model , computer simulation of particles ' s aggregation in two dimensional space , morphological characteristics of floes of yellow river ' s loess particles and its flocculation kinetics and floes model 本文以高分子絮凝黄河泥沙为研究对象，应用分形理论和计算机模拟技术，从形态学角度对这一过程进行了研究，研究内容包括高分子絮凝剂投药量公式和自动投药控制模型、二维空间内颗粒凝聚过程的计算机模拟、黄河泥沙絮体形态学以及高分子絮凝黄河泥沙的生长动力学和絮体结构模型。
In the industrial process the material in the hopper always contains some water . with the aid of liquid bridge model , dem ( discrete element method ) and mathematical models , this paper firstly simulates the flow of wet particles in a hopper to study the influence of liquid bridge on the flow patterns and flow rate 针对这一情况，本文通过引入液桥力模型，结合离散颗粒法( dem ) ，首次用计算机模拟了料仓中湿颗粒的流动，研究了液桥力对料仓内颗粒流动形态以及质量流率的影响。
Our research group proposed a model for osmotic - regulation in guard cell vacuoles ( gcv ) , which is depended on reversible disaggregation of particles and modulated by ph in gcv . published evidences for this model show a great increase of the distribution density going with obvious decrease in volume of the particles in gcv of open stomata in comparison with that of the stomata before open ( closed ) . during stomatal opening there is an acidification in gcv of about - 0 . 5 ph unit 作者所在试验室提出了保卫细胞液泡内颗粒状物质在ph介导下可逆解聚的渗透调节模型，并已发表了支持该模型的气孔开放过程中的实验证据(气孔开放前后颗粒状物的分布密度极大增加；气孔开放过程伴随液泡ph的下降[约0 . 5单位] ) 。
The aims of this mastered work are to show the changes in dimension and distribution density of particles , and the corresponding changes of ph as well in gcv during the stomatal closing , a ) the stomatal closure is induced by aba , and the sap in gcv of open and closed stomata is directly sampled with glass micro - capillary 本论文的目的是要获得气孔关闭前后保卫细胞液泡内颗粒状物在线度和分布密度上的变化以及在气孔关闭过程中保卫细胞液泡中ph的动态变化，并将结果与气孔开放过程获得的研究结果相比较。
Under the low solid flux , the particle velocity in the whole flow field was processed by mqd in the transitional flow regions . the results show that the variation of particle velocity with the time and the influence of particle clusters in the real time . under the high solid flux , in the dilute flow region , the particle velocity is analyzed and discussed with the variation of operating condition 在低循环流率下对过渡区典型流态下颗粒团的不同流态进行了mqd法处理，获得了整场颗粒运动速度及随时间变化规律，颗粒团运动对流场内颗粒速度的动态影响；对稀相区在较高固粒流率下对颗粒运动速度进行了变工况分析和讨论。
