温度和加载速率对位错发射影响的原子级模拟

以Ａｌ为研究对象，采用ＥＡＭ势实施分子动力学模拟，在Ｉ型和Ⅱ型加载条件下，研究了温度和取向对位错发射，裂纹脆性及韧性扩展的影响，模拟结果表明，升高温度计等发射位的临界应力强度因子按指数规律降低，加载国速度在一定范围内将影响临界应力强度因子，临界应力强度因子随着加载速度的增大而增大。     

加载速率对位错发射、层错宽度及位错速度影响

应用分子动力学方法研究了Ｃｕ和Ａｌ单晶在Ⅱ型加载条件下，加载速率对位错发射、层错宽度Ｗ及位错速度Ｖｄ的影响。结果表明，加载速率对Ｗ和Ｖｄ有显著影响。随着加载速率的增大，层错宽度减小，位错速度增大。当加载速率达到某一临界值时，能量不仅以发射位错的形式释放，而且形成孪晶，以降低体系的能量。     

液体金属脆机理研究

从实验和计算两个角度研究液体金属脆机理,利用第一原理和陈难先三维晶格反演方法获得Ａｌ－Ｇａ和Ｇａ－Ｇａ有效对势。运用分子动力学研究液态金属吸附对位错发射的影响。模拟结果表明,当Ａｌ晶体的纹表面吸附Ｇａ原子之后,裂尖发射位错临界应力强度因子降低。     

Effect of nluminants on the Colour Appearance of Reactive - dyed Cotton

The colour appearance of dyed textile materials changes with the viewing condition, especially with a change in the light source or Illuminant. The attitude and magnitude of the change vary with the hue of the colour, the light absorbance nature of the dye and the colour depth to which it is dyed. This paper examines the change in colour appearance of reactive - dyed cotton when the light source is changed from CIE Uluminant D65 to CIE illuminant A. Reactive dyes of primary hues were selected and applied at various depths and the dyed colours were assessed with reference to changing the illuminant.