以钛真空电弧为例,建立了宏观颗粒在飞行过程中的动力学方程,研究了宏观颗粒的温度.速度、体积等参数的变化.计算结果表明,粒子初始温度、半径不同,粒子参数随飞行距离的变化也不同.粒子初始温度越高半径越大,保持液态飞行的距离越大.
刘春, 邹积岩
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目的季节性冻融可深刻改变土壤孔隙结构,但目前对孔隙水中可溶性物质含量与组分的变化了解非常有限。方法选取典型季节性冻融区东北黑土为研究对象,通过室内冻融控制性模拟试验,借助高速冷冻离心机和紫外分光光度计,对比分析3种不同粒径(细粒径<0.5 mm、中粒径0.5~2.0 mm和粗粒径2.0~5.0 mm)回填环刀土样,分别在冻融前、后5个不同基质吸力水平下收集测定所得土壤孔隙水的电导率(EC)、可溶性有机碳含量(DOC),以及可溶性有机物紫外-荧光特性(HIX、FI、SUVA254)。结果1)冻融后 ...
曹家仪 +3 more
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