Effects of surface modification by Ni, Ti and B on electrochemical properties of Mg1.8Cu0.2Ni hydrogen storage alloy

Amorphous alloy Mg1.8Cu0.2Ni was successfully prepared by mechanical alloying (MA) and a series of (n?x)Nix(Ti?B) composites were synthesized by MA. The electrochemical properties of Mg1.8Cu0.2Ni coated by Ni, Ti and B were studied by cyclic charge-discharge, linear polarization curve, and hydrogen diffusion coefficient experiments. Experimental results indicate that Mg1.8Cu0.2Ni-[0.9Ni0.6(Ti?B)] composite which was MA 30 h exhibited the best performance and its initial discharge capacity arrived to 714.1 mAh/g. After 30 cycles the discharge capacity was above 530 mAh/g, which was much higher than that of Mg1.8Cu0.2Ni. And after 100 cycles it holded still 442.1 mAh/g. On all accounts, after modification by Ni, Ti and B, the initial discharge capacity and high-rate discharge ability of the electrode were evidently increased. At the same time, the cycle performance was also improved significantly.     

NO_x-空气催化氧化硫化氢制硫磺

利用NOx-空气氧化体系一步氧化硫化氢制硫磺。实验结果表明,在60℃下用NOx-空气催化氧化硫化氢30min后,采用气象色谱分析方法测定反应器里面残留气体中的硫化物含量,经分析计算得:此方法对硫的回收率可达99.28%。     

Analysis and simulation of molecular dynamics of lysozyme in water cluster system

The influence of water on protein conformation was investigated by simulating the molecular dynamics of a model protein lysozyme in different water systems.The lysozyme-water system with TIP3P water model and lysozyme-water cluster system with six-ring water model were evaluated.In addition,the radial distribution function of solvent around lysozyme was calculated.It is found that the distribution of water molecules around lysozyme is similar to that of water clusters.The analyses of dihedral angles and disulfide bonds of lysozyme show that the conformation of lysozyme is severely damaged in the lysozyme-water cluster system compared with that in the lysozyme-water system.This difference can be attributed to the formation of larger number of intermolecular hydrogen bonds between lysozyme and water cluster.It is in agreement with the analysis that water clusters can change the degree of denaturation in the process of heat denaturation of lysozyme.     

FeCI_3-CuCI_2-HCI催化H_2O_2分解的动力学研究

本文研究了在FeCl_3-CuCl_2-HCl混合液催化H_2O_2分解的反应动力学。测定了25、30、35、40℃下的速率常数k,其值分别为0.01524、0.02936、0.05751、0.10233 min~(-1)。直线lnκ～1/T的线性相关系数为-0.99994。由此可知,该反应为一级反应,其活化能E_(25～40)加=98.323KJ·mol(-1)。     

质能方程与核能

作者从牛顿第二定律出发,利用爱因斯坦相对论动力学基本方程推导出质能方程.质能方程是制造原子弹和核电站的理论基础.     

Study on hydrogen sulfide removal based on bench-scale experiment by bio-trickling filter

A bench-scale experiment for control of hydrogen sulfide (H2S) emissions was carried out continuously for nearly four months by using bio-trickling filter packed with ZX01 stuffing. The results suggested that the bio-trickling filter had proven excellent performance over substantial operational periods. Removal efficiency of H2S was nearly 100% when volumetric loading of the bio-trickling filter varied from 0.64 g/(m3·h) to 38.20 g/(m3·h) and metabolism products of H2S were mainly composed of SO42–. When inlet concentration of H2S was 250 mg/m3, the optimum gas retention time was 30 s and the optimum spray water flow rate was 0.005 9~0.012 L/(cm2·h). The bio-trickling filter had good ability to resist shock of high volumetric loading, and was not blocked during experiments for nearly four months during which resistance was maintained at relatively lower value, so that the bio-trickling filter need not carry out back washing frequently and can be operated steadily for long-term.     

异核氢分子离子HD+在磁场中的哈密顿量

考虑原子核的运动，通过球极坐标和直角坐标向椭球坐标的变换，采用特殊的变换方法，对平行磁场中的异核氢分子离子HD^＋的哈密顿量进行推导，同时构造出绝热厄密共轭哈密顿算符．     

氢光谱实验的计算机模拟

介绍在Windows环境下编写的一个近代物理试验——氢光谱模拟软件．软件使用VB编写，充分利用计算机直观生动特点，力求界面美观，操作方便，用于模拟整个氢光谱实验过程，内容包括实验背景、实验原理、实验导引、仪器介绍、实验操作、数据处理、问题讨论、应用提高八个部分．软件的使用有助于完善氢光谱实验环节，充实实验内容，提高教学效率．     

氢原子在Si低指数表面吸附的第一原理研究

利用局域密度近似第一性原理方法，研究了氢在Si低指数面（100）、（110）、（111）上的吸附结构。用两种不同的势（US—PP和PAW）对Si晶格常数优化，计算表明两种势对Si晶格常数的影响较小（仅为0．002nm）。US—PP势总能计算表明：对于Si体系，清洁Si表面的（111）面最稳定；随氢环境的改变（氢化学势的不同），表面稳定结构也随着变化，与实验结果相一致。     

硼对金属间化合物Ni_3Fe氢气诱发环境氢脆的影响(英文)

In this paper the tensile properties of both ordered and disordered Ni-24Fe and Ni-24Fe-0.03%B(wt%)alloys in gaseous hydrogen was investigated.The result shows that the ductility of the disordered Ni_3Fe is significantly larger than that of ordered material in gaseous hydrogen.However,the ductility of ordered Ni3Fe doped with 0.03%B is nearly the same as that of disordered one indicating the obvious suppressing effect of boron on the H_2-induced embrittlement.Based on the segregation behavior of boron in Ni_3Al,it is proposed that the suppressing effect of boron in Ni_3Fe on the H_2-induced embrittlement is attributed to the segregation of boron on grain boundaries,thereby reducing the hydrogen diffusivity along the grain boundaries.