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介绍了在网格环境下的数据访问机制的实现DASM,提出了一种文件缓存机制,并采用Adjust-LRU算法来实现元数据缓存的替换算法,该算法综合考虑缓存中记录最近被访问的时间和记录大小两个因素的影响,能更好地选择一个合适的记录。 相似文献
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分别以芘,苯酚为原料,以苯甲醛为交联剂,对甲基苯磺酸为催化剂合成了出具有三芳基甲烷结构的聚合物。用红外光谱和核磁共振碳谱对聚合物的结构进行了确认。经500-1000℃高温热致脱氢处理后,得到具有高自旋浓度的稳定的三芳甲基自由基。并用电子自旋共波谱对其特征进行了研究。 相似文献
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瑞雷波勘探方法是一种常用的近地表勘探技术,频散曲线反演是瑞雷波勘探数据处理流程中的关键步骤之一。作为一个典型的多参数、多极值、高度非线性的地球物理优化问题,频散曲线的准确、高效反演对计算近地表横波速度场,进而获取地层结构信息具有重要意义。提出一种基于改进的蜣螂优化算法的瑞雷波频散曲线反演方法,使用Halton序列初始化种群个体的位置,更好地控制初始化种群的空间分布;通过种群划分,对不同的子种群采用不同的搜索策略,一方面避免反演搜索陷入局部最优,同时实现算法的快速收敛。使用3个理论地质模型和实际资料,对改进蜣螂优化算法应用于频散曲线反演以获取地下横波速度分布的有效性进行验证。结果表明,与使用当前较为主流的改进自适应遗传算法进行频散曲线反演相比,新方法有效、稳定且能够快速收敛得到最优解。 相似文献
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Solid-Liquid Equilibria of Several Binary and Ternary Systems Containing Maleic Anhydride 总被引:1,自引:0,他引:1 下载免费PDF全文
Solid-liquid equilibria (SLE) of three binary systems and seven ternary systems containing maleic an-hydride(MA) are measured by visual method. The experimental data are compared with the calculated ones with modified universal quasichemical functional group activity coefficient(UNIFAC) method in which the interaction parameters between groups come from two sources, dortmund data bank(DDB), if there's any, and correlations based on our former presented experimental SLE data of twenty binary systems. New groups of MA, ACCOO group, COO group, >C=O group and cy-CH2 group are defined and the SLE data of rnaleic anhydride in isopropyl acetate in literature are cited in order to assess the new interaction parameters, correlated with Wilson equation and the λh equation. The modified UNIFAC method with these new regressed interaction parameters is also used to predict other three binary systems containing rnaleic anhydride. 相似文献
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Solid-liquid equilibria (SLE) of three binary systems and seven ternary systems containing maleic anhydride(MA) are measured by visual method. The experimental data are compared with the calculated ones with modified universal quasichemical functional group activity coefficient(UNIFAC) method in which the interaction parameters between groups come from two sources, dortmund data bank(DDB), if there’s any, and correlations based on our former presented experimental SLE data of twenty binary systems. New groups of MA, ACCOO group, COO group, >C=O group and cy-CH2 group are defined and the SLE data of maleic anhydride in isopropyl acetate in literature are cited in order to assess the new interaction parameters, correlated with Wilson equation and the λh equation. The modified UNIFAC method with these new regressed interaction parameters is also used to predict other three binary systems containing maleic anhydride. 相似文献
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顺丁烯二酸酐在六氢化邻苯二甲酸二异丁酯,六氢化邻苯二?… 总被引:9,自引:6,他引:3
本文测定了顺酐在六氢化邻苯二甲酸二异丁酯、六氢化邻苯二甲酸二乙酯中的溶解度数据,并采用经验方程、l h方程、Wilson 方程对数据进行了关联. 相似文献