许宝星
,
赵彬
,
岳珠峰
材料科学与工艺
doi:10.3969/j.issn.1005-0299.2006.04.010
本文通过对软薄膜/硬基体两相材料体系的平头压痕弹塑性模拟.重点研究了平压头压入过程中,不同屈服强度比(软薄膜屈服强度与硬基体屈服强度之比)以及不同压头尺寸下硬基体对压痕规律的影响.研究发现硬基体对压痕规律的影响与屈服强度比近似满足线性关系,且这种线性关系不随压头尺寸的改变而改变,相同压头半径下,屈服强度比越大,影响就越明显;相同屈服强度比下,压头半径越大,影响就越小.研究还发现压头压入过程中,材料的堆积对压入深度没有影响.
关键词:
平头压痕
,
薄膜
,
屈服强度比
,
堆积
,
有限元
刘胜权
,
汪海林
色谱
doi:10.3724/SP.J.1123.2011.00816
毛细管电泳以其分析速度快、分离效率高、操作简便、能够实现高通量而获得了广泛的应用,但由于检测窗口小而导致其检测灵敏度低.为了提高检测灵敏度,目前已发展了多种毛细管电泳在线聚焦和样品预浓缩技术,如场放大样品堆积、pH调节浓缩、胶束电动毛细管色谱、等速电泳等.这些技术由于能够在毛细管内同时实现样品的聚焦和分离、操作简便而获得J广泛的兴趣和关注.本文针对毛细管电泳的在线聚焦的原理、技术和应用做一简要的介绍和总结.
关键词:
毛细管电泳
,
在线聚焦
,
预浓缩
,
堆积
,
综述
吴雪静
,
金杰
,
颜炜
,
肖华
,
樊柳荫
,
曹成喜
色谱
doi:10.3724/SP.J.1123.2016.04029
在甲酸(α相)和氢氧化钠(γ相)缓冲液形成的移动反应界面的基础上,提出了一种衍生移动反应界面模型。模型表明在α相和γ相之间会形成一个新的β相,β相和α相形成衍生移动反应界面,β相和γ相形成移动界面。为了验证该模型的有效性,该文给出了相关理论及数值推导过程。此外,基于毛细管电泳和自制装置进行了相关实验。结果表明,若使用以前的移动反应界面,实验结果与理论计算存在较大误差,而采用该文提出的衍生移动反应界面,实验数据与理论计算结果高度一致。该文提出的衍生移动反应界面理论及模型对于电泳,特别是毛细管电泳中样品的分离与富集具有重要的意义。
关键词:
电迁移
,
电泳
,
数值计算
,
移动反应界面
,
堆积
Xuejing WU
,
Jie JIN
,
Wei YAN
,
Hua XIAO
,
Liuyin FAN
,
Chengxi CAO
色谱
doi:10.3724/SP.J.1123.2016.04029
A model of derivatized moving reaction boundary (MRB) is formulated from original MRB formed with formic buffer (phase α) and sodium hydroxide (phase γ). The model shows the formation of a new phase (phase β) with high pH value originated from phase γ, derivatized MRB created with phases α and β, as well as stationary boundary formed between phases β and γ. To demonstrate the validity of this model, the theoretical and numerical procedures are advanced. At the same time, the experimental procedures are also developed relied on a capillary electrophoresis (CE) and a home-made apparatus. There are evident systemic errors and low agreements between the experimental results and theoretical calculation with the original model of MRB developed in our previous papers. However, there are much high agreements between the experiments and theoretical computation relied on the model of derivatized MRB developed herein. The model of derivatized MRB together with the relative theoretical and experimental procedures holds evident significance for the design of the new separation and compressive techniques of samples used widely in electrophoresis including CE.
关键词:
electromigration
,
electrophoresis
,
numerical computation
,
moving reaction boundary (MRB)
,
stacking