基于示差脉冲伏安法检测高纯铟电解液中铟离子

采用恒电位沉积法在玻碳电极上制备原位铋膜电极,利用循环伏安法、电化学交流阻抗探究玻碳电极和原位铋膜电极表面的电化学行为。对缓冲液pH、铋离子浓度、富集时间及电位等实验条件进行优化,利用示差脉冲伏安法实现高纯铟电解液中铟离子（In3+）的检测,In3+的溶出峰电流值和其浓度在0.6～2 mg/L范围呈线性关系,线性方程为c=0.061I+0.093,相关系数（R2）为0.998。在NaCl和明胶存在下,该方法仍能够有效地检测高纯铟电解液中In3+浓度。     

N，N＇-双(3-羧基水杨醛叉缩胺乙基)草酰胺均双核铜(Ⅱ)，镍(Ⅱ)配合物合成和性能研究

The homobinuclear complexes of Cu (Ⅱ) and Ni (Ⅱ) with N, N＇-bis(3-Carboxyl salicyl aminal ethylene) oxalamide were synthesized, and characterized by elemental analysis, IR spectra, Uv-visible spectra, conductometry, thermogravimetry, and magnetic susceptibility measurement, which indicated the complexes own an oxalic amide bridge-linking structure. Room temperature magnetic moment data show that there are antiferromagnetic spin coupling through oxalic amide conjugated double bond, In DMF, the redox half wave potential of Cu (Ⅱ) binuclear complexes have been measured by cyclic voltammetry, which proves that the Cu (Ⅱ) complex has two redox waves.     

N,N′- 双(3-羧基水杨醛叉缩胺乙基)草酰胺均双核铜(Ⅱ),镍(Ⅱ)配合物合成和性能研究

近来发现草酰胺具有多原子成桥功能,Kahn和廖代正等人^[1,2]设计合成一些对称和不对称草酰桥联的双核及多核配合物,并对其性质进行研究,本文报导N,N'-双（3－羧基水杨醛叉缩胺乙基）草酰胺配体及其铜（II）,镍（II）均双核配合物的合成和表征,及铜双核配合物的电化学性能研究。     

Yb(Cl4)3·3H2O-18C6-C2H5OH体系(25℃)的相化学研究及固态配合物的合成与性质

The solubilities of Yb(ClO₄)₃·3H₂O-18C6-C₂H₅OH ternary system at 25 were invstigated by a semimicro method for study of phase equilibrium.and the refractive indexes of saturated solutions were determined.The behavior of water in this system during the equilibrium was examined.The results indicate that there are two kinds of complexes formed in the system, their chemical compositions are: Yb(ClO₄)₃·18C6·3H₂O·2C₂H₅OH (I) and Yb(ClO₄)₃ 18C6·3H₂O·C₂H₅OH.Both are incongruently soluble in EtOH.The influences of rare earth ions and salt anions on formation of complexes were discussed.The two solid complexes have been prepared, and their composihons and properties have been investigated by chemical analysis, IR, DTG and DSC.According to the DSC, the enthalpies of some steps during the decomposition have been obtained for complexes (Ⅲ)and (Ⅳ).     

原子吸收间接法测定干蚕蛹中的游离α—氨基酸

用水抽提试样中的游离α-氨基酸,在四硼酸钠溶液中,α-氨基酸与水不溶性磷酸铜反应,生成可溶性的氨基酸铜复合物,用致密滤纸过滤分离不溶物。以原子吸收光谱法测定滤液的铜量,间接地求α-氨基酸含量。本文对铜离子与氨基酸摩尔浓度比作了浅解。用本法测得题示试样中的α-氨基酸含量与茚三酮比色法相一致。     

制备方法对Mg1.9Al0.1Ni合金储氢性能的影响

文中采用机械合金化(MA)和氢化燃烧法(HCS)制备了Mg1.9Al0.1Ni,通过对它们储氢性能的对比研究发现,MA优于HCS.采用MA制得的Mg1.9Al0.1Ni储氢合金具有较高的活性和高储氢量,对PCT结果进行计算,得出温度和氢平衡压的关系式.Mg1.9Al0.1Ni(MA)553K时100s内吸放氢量分别为2.67和2.54 mass%H.用XRD方法进行物相分析,表明添加适量Al没有改变Mg2Ni的物相结构,由于MA能够制备出纳米晶粒,使得Mg1.9Al0.1Ni合金具有更好的储放氢动力学性能.     

三水合氯化镨与18C6在乙醇中的配位行为及配合物的合成与表征

采用半微量相平衡方法研究了ＰｒＣｌ_３·３Ｈ_２Ｏ－１８Ｃ６－Ｃ_２Ｈ_５ＯＨ三元体系在２５℃的溶解度，测定了各饱和溶液的折光率。在该体系中有三种比学计量的配合物形成，其化学组成为：２ＰｒＣｌ_３·１８Ｃ６·６Ｈ_２Ｏ·Ｃ_２Ｈ_５ＯＨ、４ＰｒＣｌ_３·３（１８Ｃ６）·１２Ｈ_２Ｏ和ＰｒＣｌ_３·１８Ｃ６·３Ｈ_２Ｏ，依据相平衡结果，合成了三种固态配合物，利用化学分析、ＩＲ、ＴＧ、ＤＴＧ、ＤＳＣ及电导研究了配合物的组成和性质。     

针形颗粒二氧化钛纳米薄膜的制备(英文)

使用醋酸修饰的溶胶-凝胶法制备了一种由针形颗粒构成的二氧化钛纳米薄膜.研究发现,可以通过控制溶胶-凝胶过程的反应条件控制所制备的纳米薄膜的形貌.对这种形貌的形成机理进行了讨论.     

A lattice Boltzmann–cellular automaton study on dendrite growth with melt convection in solidification of ternary alloys

A lattice Boltzmann(LB)–cellular automaton(CA) model is employed to study the dendrite growth of Al-4.0 wt%Cu–1.0 wt%Mg alloy. The effects of melt convection, solute diffusion, interface curvature, and preferred growth orientation are incorporated into the coupled model by coupling the LB–CA model and the CALPHAD-based phase equilibrium solver,Pan Engine. The dendrite growth with single and multiple initial seeds was numerically studied under the conditions of pure diffusion and melt convection. Effects of initial seed number and melt convection strength were characterized by newdefined solidification and concentration entropies. The numerical result shows that the growth behavior of dendrites, the final microstructure, and the micro-segregation are significantly influenced by melt convection during solidification of the ternary alloys. The proposed solidification and concentration entropies are useful characteristics bridging the solidification behavior and the microstructure evolution of alloys.     

矩形平面预应力索网大变形静力计算的级数迭代法

根据平衡荷载与索网变形及索拉力之间的关系给出了索网结构平衡的微分方程,得到了矩形平面预应力索网在均布荷载、均布拉力下不考虑几何非线性的变形曲面的一种级数解;通过对变形后索拉力的改变得到了近似考虑索网结构大变形几何非线性影响的级数迭代法,给出了修正的级数迭代法使计算收敛更加迅速;该方法应用在中关村文化商厦30m×70m平面索网的设计计算中,与非线性有限元计算结果比较验证了级数迭代法计算索网变形和索拉力大小的准确性,计算精度完全可以满足工程设计的需要.