ICP-AES法测定全元素肥料中的微量元素

本文采用高频等离子体发射光谱法测定了全元素肥料中的多种微量元素含量。选择了合适的实验条件，方法简便、快速、可靠，适用于多元素肥料及液肥的分析，结果令人满意。     

Preparation of all solid-state potentiometric ion sensors with polymer-CNT composites

This paper presents the simplest method so far to prepare all solid-state ion-selective sensors with excellent potential stability and sensing properties. With the aid of block polymer PEO-PPO-PEO (F127) multi-wall carbon nanotubes (MWCNTs) facilitating the ion-to-electron transfer can be well-dispersed in different polymer matrices including plasticized poly vinyl chloride, plasticizer-free methacrylate copolymer and PVC-ionic liquid, which leads to a general approach to prepare all solid-state ion-selective sensors by simple one-step drop casting method.     

Determination of the lifetime of the mercury 63P1 state

A pulsed tunable dye laser was used for a high resolution experimental study of mercury fluorescence from the 6³P₁ state. The output of the dye laser was frequency doubled into the 253.7 nm region using a potassium penta-borate crystal. Exponential decays were observed for each of the five individual components of the hyperfine structure separately and the effects of the trapping of resonance radiation on the observed lifetime of the 6³P₁ state of mercury were investigated for each resolvable component. Within experimental error, the natural radiative lifetime of the 6³P₁ state was found to be independent of the hyperfine component irradiated and a value of 122±2 nsec was obtained, consistent with results found by other methods.     

The ligand-field spectrum of Fe3+ in garnets

The ligand-field spectra of garnets bearing Fe³⁺ exclusively at the octahedral as well as at the octahedral and tetrahedral sites have been studied at energies between 8000 and 30 000 cm^?1. The absorption bands up to 28 000 cm^?1 have been assigned by comparison of experimental and calculated transition energies obtained by a complete solution of the d⁵ energy matrices. The Racah parameters of Fe³⁺ in both positions have been reinterpreted using a constant $\text{C}\text{B}$ ratio evaluated from the gaseous Fe³⁺ ion. It was found that the octahedral B parameters are always larger than the tetrahedral ones. The results are consistent with isomer shifts of ⁵⁷Fe and the observed structural features in oxide garnets.     

电解液对全铅单液流电池电极性能的影响

研究Pb(II)和H+离子浓度对全铅单液流电池正、负电极在复合石墨基体上电化学行为的影响.结果表明,PbO2正极和Pb负极的电极过程受电化学和扩散混合控制.Pb(II)氧化沉积成PbO2时出现成核环,铅负极成核过电位小,充放电电压差远小于PbO2正极,电池极化主要来自PbO2正极.增加H+浓度有利于降低PbO2正极和Pb负极的极化,但析氧、析氢副反应和腐蚀加重.增大Pb(II)浓度有利于抑制析氧,但PbO2正极充电电压升高,充放电电压差增大.Pb(II)浓度较低时,充放电过程中PbO2沉积层少许脱落,充电电压进一步降低且更趋平稳.为此,电解液中HBF4浓度以2 mol L-1为宜,Pb(II)浓度应在0.9 mol L-1以上.     

An All Solid State Potentiometric Sensor for Monohydrogen Phosphate Ions

An all solid state potentiometric sensor using anthracene thiourea derivative as ionophore was developed. It exhibited a near‐Nernstian slope of 30.8±1.0 mV/decade of activity for HPO₄^2? ions in the concentration range of 1.0×10^?7–1.0×10^?3 M at pH 7.4. It displayed excellent selectivity for monohydrogen phosphate over other anions and the selectivity sequence was determined as HPO₄^2?>SO₄^2?>Cl^?>NO₃^?>OAc^?>I^?>ClO₄^?. The developed sensor was evaluated for the analysis of monohydrogen phosphate ions in a standard reference material (SRM 1548) as well as in the potentiometric titration of phosphate ions with a barium chloride solution.     

All optical switching in azo-polymer planar waveguide

In this paper all optical switching in planar methyl red doped poly (methyl methacrylate) (MR/PMMA) waveguide and the effects of different parameters on this process are presented. Switching was achieved by a 488 nm Ar ion laser (pump beam) on a 633 nm He-Ne laser (probe beam) when passed through the waveguide. The effect of temperature and pump intensity, polarization and chopping frequency on switching is investigated. The switching process is attributed to trans-cis-trans photoisomerization of azo dyes in the polymer host. By studying the absorption spectrum of the sample, it is shown that both pump and probe laser beams are effective on the switching process.     

A method of implementation of frequency encoded all optical logic gates based on non-linear total reflectional switch at the interface

A novel method of implementation of frequency encoded logic gates NOT, OR, AND, NOR, NAND, X-OR, X-NOR is discussed. The frequency sources and physical requirements for the implementation are also discussed. The non-linear material (liquid) suitable for these operations to be performed should be of large non-linear coefficient, high reverse saturation absorption, large thermo-optic coefficient and low viscosity. The input controlling beams used to induce non-linearity in the switch are either of frequency υ₁ or υ₂ and the probe beam is a mixed signal of frequencies υ₁ and υ₂. Depending on the nature of the controlling inputs the output conditions of the probe can be adjusted to get different logic gates.     

在WDM全光网络上构建上层网络的路由算法

在WDM全光网络上构建上层网络需要考虑上层网络的保护机制.上层网络按保护机制可分为最大故障链路数保护网和连通保护网.针对它们的不同特点给出了构建两类上层网络并使费用最低的启发式路由算法.与已有方法相比,具有算法简单,时间复杂性小,容易实用化的特点.大量的模拟计算也证明了算法的正确性.     

分散橙25掺杂的聚合物PMMA薄膜全光极化的研究

制备了以分散橙25为客体的掺杂型有机聚合物PMMA薄膜样品，对之进行了全光极化研究，极化使薄膜产生诱导二阶非线性光学效应，种子光的强度越大，其二阶非线性极化率达到的饱和值越大;种子光的位相差、相对强度比、光场强度等因素影响薄膜的二阶非线性的优劣.