木质素氧化制取表面活性剂的适宜条件

通过正交实验研究了过氧化氢用量、氧气压力、最高温度、保温时间等条件对麦草氧化碱木质表面活性、氧化木质素中酸溶及酸不溶木质素含量的影响。结果表明，对氧化木质素表面活性及氧化后木质素中酸溶木质素的含量产生影响的4个因素的主次顺序为：过氧化氢用量，最高温度、保温时间，氧气压力。当过氧化氢用量为20％、最高温度90℃、保温时间0．5h、氧气压力0．6MPa时，氧化木质素的表面活性最好。当过氧化氢用量为20％、最高温度90℃、保温时间1h、氧气压力为0．4MPa时，氧化木质素中酸溶木质素所占的比例最高。     

Research on Deformation Regularity of Surface Migrating With Waste-fill Mining

Using FLAC3D numerical simulation software,the influence laws that the different mining depth,mining width and filling step have on the surface subsidence and horizontal movement under the condition of filling mining has been studied.The functional relation among full subsidence and horizontal movement of surface,mining depth,mining width and filling step has been given,which provides theoretical formulas been referenced for filling mining theory and has a certain guiding value.     

Application of surface plasmon resonance in screening adsorbents and explaining adsorption phenomena using model polymers

A surface plasmon resonance (SPR) technique was developed as an online screening method to identify effective adsorbents for the peptide NH₂-Cys-Thr-Trp-Trp-COOH (CW-4). To validate the SPR technique, several linear polymers containing amino acid residues were synthesized as models of their corresponding adsorbents. SPR screening of all the linear polymers demonstrated that the linear polymer containing phenylalanine residues (PPhe) exhibited the highest affinity for CW-4 among the polymers tested. In accordance with the screening results from SPR, the adsorbent containing phenylalanine (APhe) exhibited the highest adsorption capacity for CW-4. An interesting observation was that the amounts of CW-4 adsorbed on 3 adsorbents were quite small, even though both SPR and isothermal titration calorimetry (ITC) experiments indicated the presence of interactions between CW-4 and the three polymers. A kinetic analysis performed using SPR technology suggested such a phenomenon was ascribed to the poor stability of the CW-4/polymer complexes; that is, CW-4 associates with the polymers quickly, but it also dissociated quickly. The combined results suggested that SPR was a promising tool to identify the optimal adsorbent for peptides, analyze the interactions contributing to adsorption and explain adsorption phenomena using polymer models.     

双气路色谱法测定固体比表面积的特点

本文介绍了以双气路色谱法为原理的ST-03型比表面和孔径测定仪的特点。以及仪器的稳定时间、样品管插入液氧深度、平衡气总流速、液氮饱和蒸气压、相对压力范围等因素对固体表面积测定的影响。同时相应提出了降低影响的建议。     

Zr(0001)-(2×2)-O表面结构的分析

LEED强度的多重散射分析,进一步确定Zr与氧作用在低覆盖量下(<1ML),形成(2×2)-O结构,是氧吸附后进入Zr表面原子层下,占据八面体空位,形成有两层氧的under layer结构,Zr表面原子层有Fcc重构。分析得到的Zt-O键距为0.232nm,而Zr-Zr间距增大为0.268nm,比原来的距离增大约4.3％,这是由于氧插入的结果。     

精密切削加工中表面粗糙度的在线检测

本文研制了一种光纤表面粗糙度在线测量系统,通过涡流测微仪和步进马达控制系统,可以补偿由于工件尺寸变化、机床导轨几何误差和主轴部件的振动造成的光纤探头和被测工件表面之间的距离变化,使光纤测量仪的输出只反映已加工表面粗糙度的变化。该测量系统能识别出金刚石刀具切削铝合金时,影响加工表面粗糙度的主要因素是积屑瘤和振动。同时还可以用在线监测加工表面粗糙度的方法来监测刀具的磨损。     

半无限晶体中与声子普适耦合的表面电子

电子在半无限晶体内表面附近运动时,不仅受到表面光学声子和体纵光学声子的影响,而且还受表面声学声子的影响。本文同时考虑体纵光学声子、表面光学声子以及表面声学声子的影响,研究半无限晶体中与声子普适耦合的表面电子的性质。采用线性组合算符和拉格朗日乘子法,分别导出了在强、弱耦合情形下表面电子的有效哈密顿量,得到了强、弱耦合表面电子的重正化质量。     

火电站哈蒙系统空冷器的热力计算

本文提出空冷电站哈蒙系统的空冷器和自然通风冷却塔的热力计算方法。以600 MW机组为例的计算结果与实际数值极为吻合。     

紫砂制品表面工艺研究

求文通过对紫砂制品表面工艺的研究，提出了较为理想的紫红色化妆土的配方，获得了良好的色彩和光泽度，并对其它色化妆土的组成及影响因素作了一定的探讨。     

共混体系力学性能与其界面结构的关系

用小角Ｘ光散射（ＳＡＸＳ）对聚氯乙烯／线型低密度聚乙烯（ＰＶＣ／ＬＬＤＰＥ）共混体系的界面结构进行了研究，探讨了体系宏观性能与微观结构之间的关系。发现氢化聚丁二烯—ｂ—甲基丙烯酸甲酯（ＨＰＢＤ—ｂ—ＰＭＭＡ）共聚物是ＰＶＣ／ＬＬＤＰＥ共混体系有效的增容剂，其分子量在很大的范围内都提高了共混体系的力学性能，其增容本质是增加了相界面间的热力学相容性，而相间分子缠结对体系的宏观性能却影响不大。