Densities(ρ)and refractive indices(nD)of glycine(Gly),DL-alanine(Ala),DL-valine(Val)(0.02,0.04,0.06,0.08,and 0.10 mol·L-1)in 0.005 and 0.008 mol·L-1 aqueous cetyltrimethylammonium bromide(CTAB)have been mea...Densities(ρ)and refractive indices(nD)of glycine(Gly),DL-alanine(Ala),DL-valine(Val)(0.02,0.04,0.06,0.08,and 0.10 mol·L-1)in 0.005 and 0.008 mol·L-1 aqueous cetyltrimethylammonium bromide(CTAB)have been measured at 298.15,303.15,308.15,and 313.15 K.The density data have been utilized to calculate apparent molar volumes(φv),partial molar volumes(φ0v),at infinite dilution and partial molar volumes of transfer φ0v(tr)of amino acids.The refractive index data have been used to calculate molar refractivity(RD)of amino acids in aqueous cetyltrimethylammonium bromide.It has been observed that φ0v varies linearly with increasing number of carbon atoms in the alkyl chain of amino acids,and hence,was split to get contributions from the zwitterionic end groups(NH+3,COO-)and methylene group(CH2)of the amino acids.The behaviour of these parameters has been used to investigate the solute-solute,solute-solvent interactions and the effect of cetyltrimethylammonium cation on these interactions.展开更多
提出了一种基于有限元法和有限体积法的变压器三维电磁-流体-温度场耦合分析方法。通过建立变压器三维模型,采用有限元法分析变压器内磁通密度分布,并求得变压器及绕组损耗。将变压器铁芯及绕组损耗作为热源,采用有限体积法求解变压器流...提出了一种基于有限元法和有限体积法的变压器三维电磁-流体-温度场耦合分析方法。通过建立变压器三维模型,采用有限元法分析变压器内磁通密度分布,并求得变压器及绕组损耗。将变压器铁芯及绕组损耗作为热源,采用有限体积法求解变压器流体-温度场,分析变压器内部油流及温度分布,同时根据温度场结果对变压器损耗进行修正,通过迭代求解变压器流体-温度场获取变压器内部最终温度分布结果,提高求解精度。采用所提方法对35 k V油浸式变压器进行三维电磁-流体-温度场分析,将结果与经验公式的热点温度计算结果进行对比,验证了所提方法的有效性和正确性。展开更多
文摘Densities(ρ)and refractive indices(nD)of glycine(Gly),DL-alanine(Ala),DL-valine(Val)(0.02,0.04,0.06,0.08,and 0.10 mol·L-1)in 0.005 and 0.008 mol·L-1 aqueous cetyltrimethylammonium bromide(CTAB)have been measured at 298.15,303.15,308.15,and 313.15 K.The density data have been utilized to calculate apparent molar volumes(φv),partial molar volumes(φ0v),at infinite dilution and partial molar volumes of transfer φ0v(tr)of amino acids.The refractive index data have been used to calculate molar refractivity(RD)of amino acids in aqueous cetyltrimethylammonium bromide.It has been observed that φ0v varies linearly with increasing number of carbon atoms in the alkyl chain of amino acids,and hence,was split to get contributions from the zwitterionic end groups(NH+3,COO-)and methylene group(CH2)of the amino acids.The behaviour of these parameters has been used to investigate the solute-solute,solute-solvent interactions and the effect of cetyltrimethylammonium cation on these interactions.
文摘提出了一种基于有限元法和有限体积法的变压器三维电磁-流体-温度场耦合分析方法。通过建立变压器三维模型,采用有限元法分析变压器内磁通密度分布,并求得变压器及绕组损耗。将变压器铁芯及绕组损耗作为热源,采用有限体积法求解变压器流体-温度场,分析变压器内部油流及温度分布,同时根据温度场结果对变压器损耗进行修正,通过迭代求解变压器流体-温度场获取变压器内部最终温度分布结果,提高求解精度。采用所提方法对35 k V油浸式变压器进行三维电磁-流体-温度场分析,将结果与经验公式的热点温度计算结果进行对比,验证了所提方法的有效性和正确性。
