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对倾斜波动壁面上流体表面波的演化规律进行了研究. 考虑壁面形状为正弦波动壁面的情况, 分析液膜流动的线性稳定性, 并研究不同倾斜角度下扰动波波形随时间的演化情况及流经不同壁面形状时扰动波的波形变化. 对整体的波形结构分析可知, 随着时间的演化, 扰动波的演化过程呈现为更大波长的近周期变化规律, 与平板上的流动结构对比发现波动情况变得更加复杂; 当液膜流经波动壁面时, 扰动波在空间上不再呈现规律性变化, 且随着壁面倾斜角度的增加, 扰动波的振幅逐渐增加; 在相同的壁面倾角下, 波动壁面上的扰动波振幅大于平板壁面的扰动情况, 且波形扭曲程度更明显; 随着Re的增加, 扰动波振幅逐渐增加, 其对应波形的扭曲程度加深, 且随着壁面振幅的增加, 静态波振幅及扰动波振幅均随之增加, 对应的行进波周期不变. 最后, 分析了壁面倾斜角度对流动稳定性的影响. 相似文献
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碳酸钙晶须合成过程中可溶性磷酸盐的作用机理研究 总被引:2,自引:0,他引:2
以可溶性磷酸盐为控制剂,一步碳化法制备了文石相碳酸钙晶须。借助于XRD和FTIR,分析了可溶性磷酸盐在碳酸钙晶须合成过程中的作用机理。研究结果表明:通入CO2进行碳化反应前,可溶性磷酸盐与Ca(OH)2反应生成了热力学上最稳定的磷酸钙化合物——羟基磷灰石;在通入CO2初期,[CO32-(OH)]进入到羟基磷灰石的晶格,部分替代[PO43-],生成碳酸羟基磷灰石,然后以此为结晶中心诱导文石相的异相成核,Ca2+、CO32-不断叠加,进而生长为碳酸钙晶须。 相似文献
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取相应的稀土氯化物(99.9%的稀土氧化物用盐酸溶解制得)和苯丙砜(市售苯丙砜以少量水溶解后用丙酮析出纯化)按一定反应比分别溶于甲醇中,在搅拌下混合,立即产生白色絮状沉淀,放置三小时以上,抽滤,用甲醇洗涤,75℃左右常压烘干,置P2O5干燥器中干燥至恒重。 相似文献
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半抗原结合到蛋白质分子上的数目,常常影响抗体产生.过去有的作者认为接到蛋白质分子上的半抗原要尽可能的多.实验结果表明过多的半抗原并不能得到预期的结果.过多或过少均可能降低诱发产生抗体的能力.1分子大蛋白联合8至20半抗原较为适宜.为了观察和研究抗体产生的规律,需要对半抗原结合的水平进行测定,比较常用的有下列3种方法:紫外分光度法、标记抗原示踪法、飞行质谱方法,本文采用飞行质谱方法对以BSA为载体蛋白与半抗原吗啡-3-琥珀酸脂结合物进行了分子个数比的测定. 相似文献
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New Solitary Solutions of (2+1)-Dimensional Variable Coefficient Nonlinear Schrodinger Equation with an External Potential 下载免费PDF全文
By a series of transformations, the (2+1)-dimensional variable coefficient nonlinear Schr?dinger equation can turn to the Klein-Gordon equation. Many new double travelling wave solutions of the Klein-Gordon equation are obtained. Thus, the new solitary solutions of the variable coefficient nonlinear Schr?inger equation with an external potential can be found. 相似文献
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The light output functions for protons of ST-401 and BC-408 plastic scintillators were measured using white neutron source produced by the 9Be(d,n) 10B reaction at the HI-13 Tandem Accelerator at China Institute of Atomic Energy(CIAE).The LOFs of plastic scintillators for protons in the energy range of 0.5-16.5 MeV were obtained by the time-of-flight(TOF) technique and an iterative procedure.Two parameters(kB and C) were deduced by fitting the experimental data. 相似文献
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Despite the large size of most communication and transportation systems,there are short paths between nodes in these networks which guarantee the efficient information,data and passenger delivery;furthermore these networks have a surprising tolerance under random errors thanks to their inherent scale-free topology.However,their scale-free topology also makes them fragile under intentional attacks,leaving us a challenge on how to improve the network robustness against intentional attacks without losing their strong tolerance under random errors and high message and passenger delivering capacity.Here we propose two methods (SL method and SH method) to enhance scale-free network’s tolerance under attack in different conditions. 相似文献