表面

Since the dismutation of superoxide radicals by SOD is a reaction that is rate-limited by diffusion and enhanced by electrostatic guidance, all these structural features may be related to GP-MnSOD's high catalytic activity: first, Lys38 may increase the effective enzyme-substrate association rate by enhancing the electrostatic gradient at its substrate channel; second, an excess of acidic over basic residues makes the negative surface potential of GP-MnSOD more larger than those of other known MnSODs. This may enhance the reaction rate by reducing futile collisions of superoxide radicals with GP-MnSOD's surface.

因此，GP-MnSOD的上述结构特征可能与GP-MnSOD的较高酶活有关：首先，Lys38增加了底物通道口的正静电势梯度，从而可能促进了GP-MnSOD的活性中心与底物的有效结合速率；其次，GP-MnSOD表面覆盖的过量酸性残基使得它比其它MnSOD在底物通道以外的蛋白表面更多地被负静电势所覆盖，这可能有效地减少了超氧阴离子与GP-MnSOD表面的无效碰撞，从而提高了反应速率。

It is very difficult to eliminate these influence factors completely by conventional treatment. Surface properties and surface treatment of ultrafine red phosphorus and MMT and their interface properties with polymer matrices were studied in this thesis. The results were characterized by GC, FTIR, XRD, DTA, TG, XPS, UV, SEM, TEM and other physical and chemical methods. The main contents are as following: 1. The study of factors influencing ultrafine red phosphorus's invariability and phosphine liberation indicated red phosphorus undergone oxidation and dismutation reaction in air, and trace ion of iron, copper and nickel fastened water absorption and oxidation, in which the effect of copper ion was the most, while aluminium and zinc ion could slow down red phosphorus'oxidation, and silver ion had the best effect on red phosphorus moisture absorption. Inhibitors such as aluminium hydroxide, magnesium hydroxide, organic phenol and ferrous potassuim cyanide had a good effect on reducing red phosphorus moisture absorption and restraining phosphine liberation.

本文围绕纳微米材料的表面处理及其在高聚物基体中的应用这一主题，系统地研究了超细红磷和蒙脱土两种常见材料的表面特性、表面处理方法及其与高聚物基体的界面特性，通过气相色谱、红外光谱、X射线衍射、差热、热重、X射线光电子能谱仪、紫外光谱、扫描电镜、透射电镜等现代分析仪器以及其它物理、化学方法对实验结果进行了表征和分析，全文主要内容如下： 1、对影响超细红磷安定性的因素以及磷化氢的缓释研究表明：红磷在空气中发生缓慢氧化、歧化反应，微量的铜、铁、镍等金属离子增加了它的吸水和氧化速度，其中铜离子的作用最为明显，而铝、锌等离子减慢了红磷的氧化速度，银离子对减少红磷的吸湿性效果最好。

Before we go any further, we need to make sure that we have a Direct Draw surface to copy our bitmap to.

在我们进入更深层次之前，我们需要确认我们有一个用于我们位图拷贝的DirectDraw的表面，设置DirectDraw表面结构并且建立表面

All the Lewis base ion and molecule which can supply duplet to coordinate with Cr〓 as ligand. Cr〓 also has another special property, its hydrate will bond together to form multi-core complex compound by hydroxy glycidic when the concentration is properly.

含铬外加剂利用Cr〓的特点，在一定浓度下除了自身缩合形成多核络合物外，还可吸附在矿料表面，在加热条件下，与酸性集料表面的羟基缩合，通过氧桥与矿料表面键合。

In order to study the influence of defect on the surface acoustic wave,based on the theory of elastodynamics,the interaction between elastic surface acoustic waves and surface-breaking defect was simulated numerically by means of the finite element method.

为了分析材料表面缺陷对声表面波传播的影响，以弹性动力学理论为基础，采用有限元方法数值模拟了声表面波沿金属表面传播及其与表面缺陷的相互作用。

The correlation of surface wettability with surface free energy and surface structure was also established.

并建立了医用不锈钢表面润湿性和表面自由能、表面结构之间的关系。

Surface energy of nanocluster decreases with the increasing diameter, and is higher than that of bulk counterpart.

团簇的表面能随着团簇尺寸的增大而减小，而且表面能均高于体材料的表面能。

ESCA has been used in the present study to characterize the surface morphology of SPU samples with different degree of phase segregation.

本文用电子能谱研究了两种链结构SPU的表面化学组成，其目的是了解表面组成与其本体结构及性能的关系，并将SPU表面组成与本体的相分离程度联系起来。

Comparing with the two methods, spraying method will make carbon nanotubes well dispersed in the plastic surface and the conductive surface of the obtained materials will be evener and more stable.

结果表明：两种方法制成的抗静电覆膜都能大大降低塑料的表面电阻，但喷涂法更能使碳纳米管在塑料表面均匀分散，从而使塑料表面抗静电性能更加稳定。

At the same time this paper introduced the surface craft to resist wear of the plastic extruding machine's screw which was similar to the expeller by the contour structure and the working condition in domestic and foreign,pressed out the screw development and the improvement to provide the oil .

介绍了螺旋榨油机榨螺表面抗磨工艺的研究现状，分析了各种工艺的优缺点及研究进展情况；同时介绍了外形结构、工作状况与榨螺相似的塑料挤出机螺杆表面抗磨工艺的研究动向及进展情况，以期为我国螺旋榨油机榨螺表面抗磨工艺的改进提供借鉴。

The concept of equivalent rotationally rigidity is offered and the formula of rotationally rigidity is obtained.

主要做了如下几个方面的工作：对伸臂位于顶部的单层框架—筒体模型进行分析，提出了等效转动约束的概念和转动约束刚度的表达式。

Male cats normally do not need aftercare with the exception of the night after the anesthetic.

男猫通常不需要善后除了晚上的麻醉。