萃取分离-电感耦合等离子体质谱法测定高纯铝中的杂质元素

采用APDC-MIBK萃取分离铝,电感耦合等离子体质谱(ICP-MS)法同时测定高纯铝中Co,Ni,Cu,Mo,Cd,Pb和Bi。详细地讨论了仪器工作参数,内标元素,分离、富集条件,样品基体的干扰,确定了实验的最佳测定条件。结果表明,方法的检出限为0.011～0.052 μg·L-1,回收率为92.2%～103.0%,相对标准偏差(RSD)小于2.3%。方法准确、快速、简便,应用于高纯铝中Co,Ni,Cu,Mo,Cd,Pb和Bi等杂质元素的测定,结果满意。     

A quasi-discrete Hankel transform for nonlinear beam propagation

We propose and implement a quasi-discrete Hankel transform algorithm based on Dini series expansion (DQDHT) in this paper. By making use of the property that the zero-order Bessel function derivative J' ₀(0)=0, the DQDHT can be used to calculate the values on the symmetry axis directly. In addition, except for the truncated treatment of the input function, no other approximation is made, thus the DQDHT satisfies the discrete Parseval theorem for energy conservation, implying that it has a high numerical accuracy. Further, we have performed several numerical tests. The test results show that the DQDHT has a very high numerical accuracy and keeps energy conservation even after thousands of times of repeating the transform either in a spatial domain or in a frequency domain. Finally, as an example, we have applied the DQDHT to the nonlinear propagation of a Gaussian beam through a Kerr medium system with cylindrical symmetry. The calculated results are found to be in excellent agreement with those based on the conventional 2D-FFT algorithm, while the simulation based on the proposed DQDHT takes much less computing time.     

Hydrothermal Synthesis,Crystal Structure,Spectrum Properties and Quantum Chemical Calculation of a Trinuclear Copper（Ⅱ） Complex with 3-（Pyridin-2-yl）-1,2,4-triazole

A three-dimensional framework copper(Ⅱ) coordination polymer with copper carbonate basic and 3-(pyridin-2-yl)-1,2,4-triazole (Hpt) has been hydrothemally synthesized.The complex (2,C14 H10 CuN8 ·3H2 O) crystallizes in tetragonal,space group P4 2 /n,a=2.08581(12),b=2.08581(12),c=0.72331(4) nm,M r=761.73,V=3.1468(3) nm 3,Dc=1.608 g/cm 3,Z=4,F(000)=1552,GOOF=1.07,R=0.0515 and wR=0.1689.Every asymmetric unit molecular structure of the complex is composed with one copper ion,one and half water molecules and two Hpt molecules.Each copper ion is coordinated with five nitrogen atoms from four Hpt molecules,forming a distorted square pyramidal geometry.The fluorescence spectrum analysis shows that the title complex at room temperature exhibits intense photoluminescence with maximum emission at 450 nm.The quantum chemistry calculation study on the complex has been performed.The stability,some frontier molecular orbital energies and composition characteristics of some frontier molecular orbitals of the complex have been investigated.     

On neighborhoods and partial sums of certain meromorphic multivalent functions

The main purpose of the present paper is to derive some properties associated with the neighborhoods and partial sums of a certain class of meromorphic multivalent functions.     

理想完全互溶双液系相图的数学解析

理想完全互溶双液系是两个组分都严格遵守Raoult定律的体系，从数学角度看，其平面相图有着确定的函数关系。本文以Clausius-Clapeyron方程为基础，推导了该类理想体系的p-x、T-x及p-T相图的函数解析式。     

A simple model for automatically measuring radon exhalation rate from medium surface

A simple model to measure radon exhalation rate from medium surface is developed in this paper. This model is based on a combination of the “accumulation chamber” technique and a radon monitor. The radon monitor is used to perform measurement of radon concentration evolution inside the accumulation chamber, and radon exhalation rate is evaluated via nonlinear least-square fitting of the measured data. If the flow rate of the pump is high enough, radon concentration in the detector's internal cell becomes to be equal to that in the accumulation chamber quickly, and the simple model for measuring the radon exhalation rate can be generated analytically. Generally, the pump flow rate of radon monitor is low, not satisfying the condition. We find other sufficient conditions of this simplified model. On these conditions, the radon exhalation rate can be calculated accurately through this model even the flow rate of the pump is not so high. This method can be applied to develop and improve the instruments for measuring the radon exhalation rate.     

求矩阵Jordan标准形的一种新法

讨论了一种求不变因子的方法,利用不变因子与初等因子之间的关系,给出了一种求矩阵Jordan标准形的新方法.     

Removal of uranium(VI) from aqueous solution using sponge iron

Direct reduced iron (DRI), also called sponge iron, was used for the removal of U(VI) from aqueous solution. Batch experiments were conducted to evaluate the effect of various factors including contact time, solution pH, DRI dosage and initial uranium concentration on this removal process. The result suggested that U(VI) can be rapidly removed by DRI and this removal process followed an apparent first-order reaction kinetics. The optimum pH for uranium removal was between 2.0 and 4.0. Whether U(VI) can be fully removed was influenced by the molar ratio of DRI to U(VI) in solution. The aqueous U(VI) can be removed completely when this ratio was more than ca. 1,000. The U(VI) removal capacities of DRI decreased with increasing DRI dosages at a constant concentration of U(VI), but increased almost linearly with increasing initial U(VI) concentrations at a fixed dosage of DRI. The maximum U(VI) removal capacity was 5.71 mg/g DRI. Finally, the possible mechanism of U(VI) removal by DRI was also discussed. The XPS and XRD analysis showed that U(VI) was deposited as UO₃ onto DRI surface, indicating that U(VI) can be removed without reduction.     

二苄基锡水杨醛缩邻氨基苯酚Schiff碱配合物的合成、结构及荧光性质研究

二苄基二氯化锡和水杨醛缩邻氨基苯酚Schiff碱按物质的量比1:1反应, 合成了二苄基锡水杨醛邻缩氨基苯酚Schiff碱配合物。经X-射线衍射方法测定了其晶体结构, 属单斜晶系, 空间群为P2₁/n, 晶体学参数a=1.110 03(3) nm, b=1.719 87(5) nm, c=1.176 09(3) nm, β=100.564 0(10)°, V=2.207 23(10) nm³, Z=4, D_c=1.541 g·cm^-3, μ(Mo Kα)=11.81 cm^-1, F(000)=1 023, R₁=0.026 8, wR₂=0.061 9, 中心锡原子为五配位的畸变三角双锥构型。对其结构进行量子化学从头计算, 探讨了配合物的稳定性、分子轨道能量以及部分前沿分子轨道的组成特征。研究了配合物的荧光性质。     

氢键构筑网络结构的三正丁基锡羧酸酯的合成、结构及抗癌活性

微波辐射条件下, μ-氧-双(三正丁基锡)分别与二苯乙醇酸、2-氯烟酸反应, 合成了三正丁基锡羧酸酯(n-Bu)₃SnO₂CR(H₂O)[R:C(OH)Ph₂ (1), C₅NH₃Cl (2)]。经IR、1H和13C NMR、元素分析及X-射线单晶衍射表征结构。配合物1、2均属正交晶系, 空间群分别为Pbca和P2₁2₁2₁, 配基与中心锡原子均构成五配位畸变三角双锥构型。1和2晶体中, 存在着多种氢键作用, 分别连接扩展成二维和三维超分子网络。初步测试表明:1和2对人癌细胞Colo205、HepG2、MCF-7、Hela、NCI-H460增殖均有较强的抑制作用, 尤其对MCF-7、Hela、NCI-H460的抑制作用均大大优于卡铂, 且1的抗肿瘤活性更优于2。