二元自缩合乙烯基聚合反应体系的统计热力学

应用统计力学原理对二元自缩合乙烯基聚合反应体系(由单体和引发单体组成)的统计热力学特征予以研究.首先从两种不同的角度给出与聚合反应相应的配分函数,据此得到反应体系的平衡自由能、质量作用定律以及超支化高分子的数量分布函数,进而计算了体系的比热和等温压缩系数等热力学量.进一步研究了超支化高分子的空间尺度,给出反应体系k次均方回转半径的递推公式,计算了各种不同溶剂条件下的均方回转半径,指出引发单体分数、反应程度和溶剂效应对超支化高分子空间尺度的影响.     

一类蚂蚁黏附系统的实验研究

以家蚁为研究对象, 利用扫描电镜、光学显微镜等仪器对其足部微观黏附结构进行了实验观 察, 研究了家蚁在洁净玻璃板上爬行的黏附机理, 并观察了不同表面粗糙度、倾斜度的玻璃 板及蜡表面上蚂蚁的爬行行为. 实验结果表明此类蚂蚁的黏附主要依赖于足部缩放自如的囊 状中垫. 玻璃板粗糙度及倾斜度对蚂蚁爬行行为无明显影响, 而随着蜡表面倾斜度的增大, 家蚁的黏附爬行能力逐渐降低, 最终在一定倾斜度的蜡表面黏附失效.     

AaDd型氢键流体的统计理论（V）：球形微腔中的相平衡

利用密度泛函理论并结合改进的基本度量理论研究了球形微腔中AaDd型氢键流体的相态结构．首先,根据氢键流体在球腔中的吸附一脱附等温线以及相应的巨势等温线获得不同条件下氢键流体的相图．在此基础上,重点讨论了氢键作用、球腔尺寸以及腔壁与流体之间的相互作用等因素对氢键流体相平衡特征的影响．结果表明,流体层化转变和毛细凝聚的临界温度、临界密度和临界相区域等相态特征与这些因素密切相关．研究结果可为进一步揭示几何约束下氢键流体的相平衡及聚集态结构提供可能的理论线索．     

Irradiation effects of CO2 laser parameters on surface morphology of fused silica

To understand the surface morphology evolution of fused silica induced by 10.6-μm CO2 laser irradiation at different parameters,this paper reports that optical microscopy,profilometry,and hydrophilicity tests are utilized to characterize the surface structure and roughness of the laser irradiated area. The results show that three typical surface morphologies and two typical hydrophilicity test images are observed at different laser powers and pulse durations. The correlations between surface temperature and surface morphology as well as hydrophilicity behaviours are presented. The different hydrophilicity behaviours are related to surface structures of the laser-induced crater and thermal diffusion area. The thermal diffusion length monotonously increases with increasing laser power and pulse duration. The crater width is almost determined by the laser beam size. The crater depth is more sensitive to the laser power and pulse duration than the crater width.     

Quark confinement and the fractional quantum Hall effect

Working in the physics of Wilson factor and Aharonov-Bohm effect, we find in the fluxtube-quark system the topology of a baryon consisting of three heavy flavor quarks resembles that of the fractional quantum Hall effect (FQHE) in condensed matter. This similarity yields the result that the constituent quarks of baryon have the ``filling factor' 1/3, thus the previous conjecture that quark confinement is a correlation effect is confirmed. Moreover, by deriving a Hamiltonian of the system analogous to that of FQHE, we predict an energy gap for the ground state of a heavy three-quark system.     

Effects of Vacuum on Fused Silica UV Damage

Damage points induced by 355 nm laser irradiation increase more quickly on the surface of fused silica in vacuum of about 10^-3 Pa than in atmospheric air at the same fluence. The larger concentration of point defects in vacuum is confirmed by photoluminescence intensity. X-ray photoelectron spectroscopy and infrared absorption indicate the formation of sub-stoichiometric silica on the surface. The degradation mechanism of fused silica in vacuum is discussed.     

CO2激光预处理对熔石英表面影响的实验研究

为研究CO2激光预处理参数对熔石英基片表面的影响,采用波长为10．6μm,重复频率为100Hz的CO2激光对完好的熔石英基片进行单点单次辐照处理。实验发现,对于不同的修复程度,面形变化不完全相同,损伤斑的形貌也各不相同。实验得到了适合修复的参数范围,并研究了修复对于材料粗糙度和疏水性的影响。对中度修复的取样点表面的局部粗糙度进行了统计,发现预处理过程中的污染沉积物在一定范围存在。在此基础上对污染的影响范围分布规律进行了统计。     

Af型自由基均聚反应的固化理论(Ⅱ)——凝胶网络的结构参数

用高分子反应统计理论,给出A_f型自由基均聚反应在不同反应程度时的弹性有效链及悬吊链的链数、链节数和平均链长,也得到了体系的有效交联点数和弹性模量,进而给出弹性有效链的数量和重量分数,以此可进一步揭示该反应体系凝胶网络的粘弹性及相关的力学性质.