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     THE PRINCIPLE OF ACCURATE MEASUREMENT OF THICKNESS OF COMPOUND THIN FILMS
     精确测量双层复合膜厚度的物理原理 用PCSA型光学系统处理四相体系
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     The metabolic characters of production phase in the fermentation of unde-cane dicarboxylic acid were analyzed.
     分析了十三碳二元酸发酵过程中产酸期的代谢特点,对产酸期四相体系发酵动力学进行了研究。
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     The two reactions occured in the system are:L PrCl3+Sr3PrCl9+MgCl2 L+SrCl2 Sr3PrCl9+MgCl2
     体系内有两个四相平衡反应为:
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     World-system
     世界体系
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     248 from both.
     248体系
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     The Encoding Rules in 4 Differential Phase-shift Keying System
     四相差分相移键控的编码
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     Four phase stepping motor driver
     四相步进电机驱动器
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The metabolic characters of production phase in the fermentation of unde-cane dicarboxylic acid were analyzed. The kinetic models of cell growth, product formation and substrate consumption in production phase were established respectively. The parameters of the models have been estimated by regression. The calculated curves fit the experimental date quite well and the average deviation between those over production phase is 3. 6%. Based on the kinetic models, computer simulations of production phase were fulfilled....

The metabolic characters of production phase in the fermentation of unde-cane dicarboxylic acid were analyzed. The kinetic models of cell growth, product formation and substrate consumption in production phase were established respectively. The parameters of the models have been estimated by regression. The calculated curves fit the experimental date quite well and the average deviation between those over production phase is 3. 6%. Based on the kinetic models, computer simulations of production phase were fulfilled. From the computer simulations, it can be seen that the product formation rate could be increased markedly by the following ways: increasing cell concentration before switching into production phase, decreasing the peroid of cell growth phase and lowering the product concentration of production phase.

分析了十三碳二元酸发酵过程中产酸期的代谢特点,对产酸期四相体系发酵动力学进行了研究。提出了菌体生长、产物形成及底物消耗的动力学模型,对模型参数进行了回归估值,并对产酸期进行了拟合,结果表明,模型的计算值和实测值较为吻合,平均相对偏差为3.6%。利用所建模型对产酸期进行了多种操作条件下的模拟计算,结果表明,提高进入产酸期的菌体浓度、缩短菌体生长期时间及降低发酵液中产物浓度具有提高产物形成速率的有效途径。

Collapses in soil may be induced by heavy rainfall and appear in large numbers, especially after a long time's drought. Similarly, they also can be induced by irrigation in drought seasons. So it can be inferred that the appearance of collapses in soil is connected with the moisture content of soil closely. Soil is made up of three zones:the aerated zone, capillary zone and saturated zone. The rainwater supplying the aquifer must run through the unsaturated zone to reach the saturated one. The infiltration water...

Collapses in soil may be induced by heavy rainfall and appear in large numbers, especially after a long time's drought. Similarly, they also can be induced by irrigation in drought seasons. So it can be inferred that the appearance of collapses in soil is connected with the moisture content of soil closely. Soil is made up of three zones:the aerated zone, capillary zone and saturated zone. The rainwater supplying the aquifer must run through the unsaturated zone to reach the saturated one. The infiltration water drives the movements of solid,liquid and air of soil. When the soil is far from saturated, the cracks in the soil will be open and their suction force reaches the maximum value. When the rainwater is attracted by unsaturated soil and the soil gets saturated, the linkup of soil grains goes down, which leads to the decrease of ability to resist corrosion and collapse in soil. The transference of hydraulic pressure in unsaturated soil and the formation of collapses in soil induced by rainfall are discussed in detail in the paper.

有些土体塌陷由降雨诱发 ,特别是久旱无雨后突降暴雨 ,有时会导致岩溶塌陷成群出现。同样 ,在干旱季节农田灌溉也会导致塌陷大量出现 ,可见塌陷的产生与土壤的干湿状态密切相关。自然土层接近地表部位为非饱和的包气带 ,以下才是饱水带 ,大气降雨及农田灌溉水入渗地下要有一个由非饱和带向饱水带运动的过程。由于土体为固气液和收缩膜四相体系 ,在地表水入渗地下的过程中 ,入渗的水峰会对土体结构中的气体产生驱动作用 ,对固体骨架也会产生动力作用。本文采用非饱和土力学的基本原理 ,对于非饱和土中吸力和水压传递机理以及降雨诱发塌陷进行了分析 ,并按提出的成因机制对暴雨诱发塌陷实例进行了分析。

 
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