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| 1 | Experimental Study of Fluorine Transport Rules in Unsaturated Stratified Soil显示文摘With the aid of soil column test models,the transport rules of fluorine contaminants in unsaturated stratified soils are discussed. Curves of F-concentrations at different times and sites in the unsaturated stratified soil were ob-tained under conditions of continuous injection of fluoride contaminants and water. Based on the analysis of the actual observation data,the values between computed results and observed data were compared. It is shown that the chemical properties of fluorine ions are active. The migration process of fluorine ions in soils is complex. Because of the effect of adsorption and desorption,the curve of the fluorine ion breakthrough curve is not symmetric. Its concentration peak value at each measuring point gradually decays. The tail of the breakthrough curve is long and the process of leaching and purifying using water requires considerable time. Along with the release of OHˉ in the process of fluorine absorp-tion,the pH value of the soil solution changed from neutral to alkalinity during the test process. The first part of the breakthrough curve fitted better than the second part. The main reason is that fluorine does not always exist in the form of fluorinions in groundwater. Given the long test time,fluorinions possibly react with other ions in the soil solution to form complex water-soluble fluorine compounds. Only the retardation factor and source-sink term have been considered in our numerical model,which may leads to errors of computed values. But as a whole the migration rules of fluorine ions are basically correct,which indicates that the established numerical model can be used to simulate the transport rules of fluorine contaminants in unsaturated stratified soils. | ZHANG Hong-mei SU Bao-yu LIU Peng-hua ZHANG Wei | 2007 | Journal of China University of Mining and Technology2007，17，3： | 8 |
| 2 | 耐磨低合金铸钢的研究与应用显示文摘研究了一种不含钼、镍等贵重合金元素的耐磨低合金铸钢材料,具有足够的淬透性和淬硬性,经油冷淬火和中温回火处理后,硬度大于58HRc,冲击韧性大于22J/cm2,断裂韧性大于35MPa.m1/2。用于制造大型球磨机衬板,耐磨性比高锰钢衬板提高1倍以上,具有很好的经济效益。 | 蒋志强 胡中艳 符寒光 杨军 | 2006 | 金属热处理2006，31，z1： | 5 |
| 3 | 轧机复合衬板工作层材料的研究和应用显示文摘研究了一种适合于制造轧机复合衬板的工作层材料,对衬板材料的化学组成、各种合金元素的作用及其加入量、衬板熔炼和轧制工艺进行了深入研究,衬板工作层材料经油淬和中温回火后,硬度大于HRC60,抗拉强度大于1600MPa,冲击韧性大于18J/cm2,断裂韧性大于37MPa·m0 5。应用于钢管热连轧机架上,耐磨性比堆焊衬板提高1倍以上。 | 符寒光 黄兆军 宋锦春 谢里阳 | 2005 | 钢铁钒钛2005，26，1： | 3 |
| 4 | Theoretical analysis of the limiting rate of phreatic evaporation for aeolian sandy soil in Taklimakan Desert显示文摘Phreatic evaporation is a great lose for shallow groundwater in the Taklimakan Desert. Given soil type and groundwater table, the limiting rate of phreatic evaporation is defined as the maximum of water transferred from groundwater to soil surface per unit time, which is a key parameter and control condition for phreatic evaporation model developing. The soil water characteristic curve for the aeolian sandy soil in the Taklimakan Desert was fitted with the least square method based on the formula of soil moisture characteristics curve proposed by Van Genuchten, using observed soil moisture and soil water suction data. The unsaturated hydraulic conductivity was determined by the instantaneous profile method in situ and the calculation formula for unsaturated hydraulic conductivity was established. According to the steady flow theory, the quasi-analytical solution of limiting rate of phreatic evaporation was derived on the basis of generalization of the formula of unsaturated hydraulic conductivity. The results show that the soil moisture characteristics in the Taklimakan Desert can be well described by Van Genuchten’s formula, and the limiting rate of phreatic evaporation declines by power function with the descending of groundwater table. | HU ShunJun LEI JiaQiang XU XinWen SONG YuDong TIAN ChangYan CHEN XiaoBin LI XiuChang | 2008 | Chinese Science Bulletin2008，53，S2： | 2 |
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