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利用基于线性黏聚接触模型的离散元法对不同颗粒系统的堆积过程进行了数值模拟研究,分析了颗粒形状和湿颗粒间液桥力对颗粒堆积形态的影响机理,获得了球形和块状湿颗粒堆基底表面所受的法向力以及堆中颗粒间的法向力和切向力"中心凹陷"式的分布规律,讨论了颗粒形状和黏聚能量密度对基底表面作用力和颗粒间作用力的影响.研究结果表明,颗粒形状和液桥力对颗粒堆的堆积形态具有显著的影响.堆积角随着黏聚能量密度的增加而增大,并且相同条件下的块状颗粒堆积角大于球形颗粒.颗粒形状和黏聚能量密度对基底表面所受作用力和堆中颗粒间的作用力变化及最大幅值均有影响作用.当黏聚能量密度值逐渐增大时,颗粒堆的作用力最大幅值均逐渐增大,并且块状颗粒堆的作用力最大幅值大于球形颗粒堆.当黏聚能量密度值过大时,颗粒堆力学特性更加复杂,液桥力对颗粒堆积特性的影响作用大于颗粒形状的影响. 相似文献
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毛细管区带电泳分离测定邻、对、间氯代苯酚 总被引:3,自引:0,他引:3
通过改变电泳条件,用毛细管区带电泳成功地分离了邻、对、间氯代苯酚,并检测到废水中样品的含量。研究了缓冲溶液种类、浓度、pH值、电泳电压以及内标物的选择,并得出了三种样品的标准曲线、线性范围以及加样回收率,为环境样品的监测提供了依据。 相似文献
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Schiff碱双核Mn配合物的合成、结构和性能研究 总被引:3,自引:0,他引:3
Five manganese complexes of Schiff base were synthesized: [MnⅣ,Ⅳ(μ-O)(Salen)]2·DMF·H2O (1), [MnⅣ,Ⅳ(μ-O)(5-BrSalen)]2·DMF·0.5H2O (2), {MnⅣ,Ⅳ(μ-O)[Sal(1,2-pn)]}2·H2O (3), {MnⅣ,Ⅳ(μ-O)[5-Br-Sal(1,2-pn)]}2·H2O (4), {MnⅣ,Ⅳ(μ-O)[5-CH3-Sal(1,2-pn)]}2·2H2O (5), and were characterized by element analysis, IR and UV-Vis spectra. The results of cyclic voltammogram show that Schiff base ligands can drop the potential of manganese and steady high oxide state of manganese. The magnetic properties of 1 and 3 have also been studied. The results show that there is a weak ferromagnetically coupling of MnⅣ2 pair at room and low temperature, and the interactions of complex 3 are weaker than complex 1. 相似文献
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Zn(Ⅱ)-双呋喃甲醛缩乙二胺配合物的合成、结构和性质 总被引:6,自引:0,他引:6
合成了未见文献报道的双呋喃甲醛缩乙二胺与Zn2 + 的Schiff碱配合物 ,通过单晶X射线衍射法测定了其结构 .晶体属于单斜晶系 ,空间群P2 ( 1) /n ,a =0 8780 ( 11)nm ,b =1 44 61( 18)nm ,c =1 14 95 ( 15 )nm ,α =90° ,β =94 12 1( 18)° ,γ =90° ,V =1 45 6( 3 )nm3 ,Z =4,F( 0 0 0 ) =712 ,μ =2 0 5 1mm-1,R1=0 0 471,wR2 =0 0 85 7.用Gaussian 98程序计算了该配合物的键长、键角、电荷布局和频率 .通过荧光光谱研究了配体与配合物的荧光性质 ,并通过元素分析、红外光谱、热分析对配合物进行了表征 相似文献
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The thermal dehydration and decomposition kinetics of CH2(COO)2Cu·2H2O were investigated using the non-isothermal method by thermogravimetry (TG) technique in N2. The iterative iso-conversional methods were applied to calculate the activation energy Ea of dehydration and decomposition, and the most probable mechanism function G(α) was determined by means of the master plots method. The pre-exponential factor A was obtained on the basis of Ea and G(α). Kinetic parameters (Ea and lnA) of dehydration were given as: Ea=139.79 kJ·mol-1, ln(A/s-1)=47.38. The mechanism function of the dehydration was G(α)=[-ln(1-α)]2/3, and the decomposition of CH2(COO)2Cu proceeds to completion by two distinct reactions. These two reactions overlap in the transition process (0.45<α<0.65). Kinetic parameters (Ea and lnA )of the first reaction of decomposition were: Ea=201.15 kJ·mol-1, ln(A/s-1)=52.29, and the mechanism function was G(α)=[1-α]-0.37. And in the second reaction G(α)=α+(1-α)ln(1-α), Ea=156.74 kJ·mol-1, ln(A/s-1)=39.58. 相似文献
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